1b2441318SGreg Kroah-Hartman // SPDX-License-Identifier: GPL-2.0 21da177e4SLinus Torvalds /* 31da177e4SLinus Torvalds * linux/fs/proc/base.c 41da177e4SLinus Torvalds * 51da177e4SLinus Torvalds * Copyright (C) 1991, 1992 Linus Torvalds 61da177e4SLinus Torvalds * 71da177e4SLinus Torvalds * proc base directory handling functions 81da177e4SLinus Torvalds * 91da177e4SLinus Torvalds * 1999, Al Viro. Rewritten. Now it covers the whole per-process part. 101da177e4SLinus Torvalds * Instead of using magical inumbers to determine the kind of object 111da177e4SLinus Torvalds * we allocate and fill in-core inodes upon lookup. They don't even 121da177e4SLinus Torvalds * go into icache. We cache the reference to task_struct upon lookup too. 131da177e4SLinus Torvalds * Eventually it should become a filesystem in its own. We don't use the 141da177e4SLinus Torvalds * rest of procfs anymore. 15e070ad49SMauricio Lin * 16e070ad49SMauricio Lin * 17e070ad49SMauricio Lin * Changelog: 18e070ad49SMauricio Lin * 17-Jan-2005 19e070ad49SMauricio Lin * Allan Bezerra 20e070ad49SMauricio Lin * Bruna Moreira <bruna.moreira@indt.org.br> 21e070ad49SMauricio Lin * Edjard Mota <edjard.mota@indt.org.br> 22e070ad49SMauricio Lin * Ilias Biris <ilias.biris@indt.org.br> 23e070ad49SMauricio Lin * Mauricio Lin <mauricio.lin@indt.org.br> 24e070ad49SMauricio Lin * 25e070ad49SMauricio Lin * Embedded Linux Lab - 10LE Instituto Nokia de Tecnologia - INdT 26e070ad49SMauricio Lin * 27e070ad49SMauricio Lin * A new process specific entry (smaps) included in /proc. It shows the 28e070ad49SMauricio Lin * size of rss for each memory area. The maps entry lacks information 29e070ad49SMauricio Lin * about physical memory size (rss) for each mapped file, i.e., 30e070ad49SMauricio Lin * rss information for executables and library files. 31e070ad49SMauricio Lin * This additional information is useful for any tools that need to know 32e070ad49SMauricio Lin * about physical memory consumption for a process specific library. 33e070ad49SMauricio Lin * 34e070ad49SMauricio Lin * Changelog: 35e070ad49SMauricio Lin * 21-Feb-2005 36e070ad49SMauricio Lin * Embedded Linux Lab - 10LE Instituto Nokia de Tecnologia - INdT 37e070ad49SMauricio Lin * Pud inclusion in the page table walking. 38e070ad49SMauricio Lin * 39e070ad49SMauricio Lin * ChangeLog: 40e070ad49SMauricio Lin * 10-Mar-2005 41e070ad49SMauricio Lin * 10LE Instituto Nokia de Tecnologia - INdT: 42e070ad49SMauricio Lin * A better way to walks through the page table as suggested by Hugh Dickins. 43e070ad49SMauricio Lin * 44e070ad49SMauricio Lin * Simo Piiroinen <simo.piiroinen@nokia.com>: 45e070ad49SMauricio Lin * Smaps information related to shared, private, clean and dirty pages. 46e070ad49SMauricio Lin * 47e070ad49SMauricio Lin * Paul Mundt <paul.mundt@nokia.com>: 48e070ad49SMauricio Lin * Overall revision about smaps. 491da177e4SLinus Torvalds */ 501da177e4SLinus Torvalds 517c0f6ba6SLinus Torvalds #include <linux/uaccess.h> 521da177e4SLinus Torvalds 531da177e4SLinus Torvalds #include <linux/errno.h> 541da177e4SLinus Torvalds #include <linux/time.h> 551da177e4SLinus Torvalds #include <linux/proc_fs.h> 561da177e4SLinus Torvalds #include <linux/stat.h> 575995477aSAndrea Righi #include <linux/task_io_accounting_ops.h> 581da177e4SLinus Torvalds #include <linux/init.h> 5916f7e0feSRandy Dunlap #include <linux/capability.h> 601da177e4SLinus Torvalds #include <linux/file.h> 619f3acc31SAl Viro #include <linux/fdtable.h> 621da177e4SLinus Torvalds #include <linux/string.h> 631da177e4SLinus Torvalds #include <linux/seq_file.h> 641da177e4SLinus Torvalds #include <linux/namei.h> 656b3286edSKirill Korotaev #include <linux/mnt_namespace.h> 661da177e4SLinus Torvalds #include <linux/mm.h> 67a63d83f4SDavid Rientjes #include <linux/swap.h> 68b835996fSDipankar Sarma #include <linux/rcupdate.h> 691da177e4SLinus Torvalds #include <linux/kallsyms.h> 702ec220e2SKen Chen #include <linux/stacktrace.h> 71d85f50d5SNeil Horman #include <linux/resource.h> 725096add8SKees Cook #include <linux/module.h> 731da177e4SLinus Torvalds #include <linux/mount.h> 741da177e4SLinus Torvalds #include <linux/security.h> 751da177e4SLinus Torvalds #include <linux/ptrace.h> 760d094efeSRoland McGrath #include <linux/tracehook.h> 7787ebdc00SAndrew Morton #include <linux/printk.h> 78efb1a57dSAlexey Dobriyan #include <linux/cache.h> 79a424316cSPaul Menage #include <linux/cgroup.h> 801da177e4SLinus Torvalds #include <linux/cpuset.h> 811da177e4SLinus Torvalds #include <linux/audit.h> 825addc5ddSAl Viro #include <linux/poll.h> 831651e14eSSerge E. Hallyn #include <linux/nsproxy.h> 848ac773b4SAlexey Dobriyan #include <linux/oom.h> 853cb4a0bbSKawai, Hidehiro #include <linux/elf.h> 8660347f67SPavel Emelyanov #include <linux/pid_namespace.h> 8722d917d8SEric W. Biederman #include <linux/user_namespace.h> 885ad4e53bSAl Viro #include <linux/fs_struct.h> 895a0e3ad6STejun Heo #include <linux/slab.h> 904eb5aaa3SIngo Molnar #include <linux/sched/autogroup.h> 916e84f315SIngo Molnar #include <linux/sched/mm.h> 92f7ccbae4SIngo Molnar #include <linux/sched/coredump.h> 93b17b0153SIngo Molnar #include <linux/sched/debug.h> 943905f9adSIngo Molnar #include <linux/sched/stat.h> 95640708a2SPavel Emelyanov #include <linux/flex_array.h> 9648f6a7a5SPavel Emelyanov #include <linux/posix-timers.h> 9743d2b113SKAMEZAWA Hiroyuki #include <trace/events/oom.h> 981da177e4SLinus Torvalds #include "internal.h" 99faf60af1SCyrill Gorcunov #include "fd.h" 1001da177e4SLinus Torvalds 101ac7f1061SAlexey Dobriyan #include "../../lib/kstrtox.h" 102ac7f1061SAlexey Dobriyan 1030f2fe20fSEric W. Biederman /* NOTE: 1040f2fe20fSEric W. Biederman * Implementing inode permission operations in /proc is almost 1050f2fe20fSEric W. Biederman * certainly an error. Permission checks need to happen during 1060f2fe20fSEric W. Biederman * each system call not at open time. The reason is that most of 1070f2fe20fSEric W. Biederman * what we wish to check for permissions in /proc varies at runtime. 1080f2fe20fSEric W. Biederman * 1090f2fe20fSEric W. Biederman * The classic example of a problem is opening file descriptors 1100f2fe20fSEric W. Biederman * in /proc for a task before it execs a suid executable. 1110f2fe20fSEric W. Biederman */ 1120f2fe20fSEric W. Biederman 113efb1a57dSAlexey Dobriyan static u8 nlink_tid __ro_after_init; 114efb1a57dSAlexey Dobriyan static u8 nlink_tgid __ro_after_init; 1151270dd8dSAlexey Dobriyan 1161da177e4SLinus Torvalds struct pid_entry { 117cedbccabSAlexey Dobriyan const char *name; 118623f594eSAlexey Dobriyan unsigned int len; 119d161a13fSAl Viro umode_t mode; 120c5ef1c42SArjan van de Ven const struct inode_operations *iop; 12100977a59SArjan van de Ven const struct file_operations *fop; 12220cdc894SEric W. Biederman union proc_op op; 1231da177e4SLinus Torvalds }; 1241da177e4SLinus Torvalds 12561a28784SEric W. Biederman #define NOD(NAME, MODE, IOP, FOP, OP) { \ 12620cdc894SEric W. Biederman .name = (NAME), \ 127c5141e6dSEric Dumazet .len = sizeof(NAME) - 1, \ 12820cdc894SEric W. Biederman .mode = MODE, \ 12920cdc894SEric W. Biederman .iop = IOP, \ 13020cdc894SEric W. Biederman .fop = FOP, \ 13120cdc894SEric W. Biederman .op = OP, \ 13220cdc894SEric W. Biederman } 13320cdc894SEric W. Biederman 134631f9c18SAlexey Dobriyan #define DIR(NAME, MODE, iops, fops) \ 135631f9c18SAlexey Dobriyan NOD(NAME, (S_IFDIR|(MODE)), &iops, &fops, {} ) 136631f9c18SAlexey Dobriyan #define LNK(NAME, get_link) \ 13761a28784SEric W. Biederman NOD(NAME, (S_IFLNK|S_IRWXUGO), \ 13820cdc894SEric W. Biederman &proc_pid_link_inode_operations, NULL, \ 139631f9c18SAlexey Dobriyan { .proc_get_link = get_link } ) 140631f9c18SAlexey Dobriyan #define REG(NAME, MODE, fops) \ 141631f9c18SAlexey Dobriyan NOD(NAME, (S_IFREG|(MODE)), NULL, &fops, {}) 142631f9c18SAlexey Dobriyan #define ONE(NAME, MODE, show) \ 143be614086SEric W. Biederman NOD(NAME, (S_IFREG|(MODE)), \ 144be614086SEric W. Biederman NULL, &proc_single_file_operations, \ 145631f9c18SAlexey Dobriyan { .proc_show = show } ) 1461da177e4SLinus Torvalds 147aed54175SVegard Nossum /* 148aed54175SVegard Nossum * Count the number of hardlinks for the pid_entry table, excluding the . 149aed54175SVegard Nossum * and .. links. 150aed54175SVegard Nossum */ 1511270dd8dSAlexey Dobriyan static unsigned int __init pid_entry_nlink(const struct pid_entry *entries, 152aed54175SVegard Nossum unsigned int n) 153aed54175SVegard Nossum { 154aed54175SVegard Nossum unsigned int i; 155aed54175SVegard Nossum unsigned int count; 156aed54175SVegard Nossum 1571270dd8dSAlexey Dobriyan count = 2; 158aed54175SVegard Nossum for (i = 0; i < n; ++i) { 159aed54175SVegard Nossum if (S_ISDIR(entries[i].mode)) 160aed54175SVegard Nossum ++count; 161aed54175SVegard Nossum } 162aed54175SVegard Nossum 163aed54175SVegard Nossum return count; 164aed54175SVegard Nossum } 165aed54175SVegard Nossum 166f7ad3c6bSMiklos Szeredi static int get_task_root(struct task_struct *task, struct path *root) 1671da177e4SLinus Torvalds { 1687c2c7d99SHugh Dickins int result = -ENOENT; 1697c2c7d99SHugh Dickins 1700494f6ecSMiklos Szeredi task_lock(task); 171f7ad3c6bSMiklos Szeredi if (task->fs) { 172f7ad3c6bSMiklos Szeredi get_fs_root(task->fs, root); 1737c2c7d99SHugh Dickins result = 0; 1747c2c7d99SHugh Dickins } 1750494f6ecSMiklos Szeredi task_unlock(task); 1767c2c7d99SHugh Dickins return result; 1770494f6ecSMiklos Szeredi } 1780494f6ecSMiklos Szeredi 1797773fbc5SCyrill Gorcunov static int proc_cwd_link(struct dentry *dentry, struct path *path) 1800494f6ecSMiklos Szeredi { 1812b0143b5SDavid Howells struct task_struct *task = get_proc_task(d_inode(dentry)); 1820494f6ecSMiklos Szeredi int result = -ENOENT; 18399f89551SEric W. Biederman 18499f89551SEric W. Biederman if (task) { 185f7ad3c6bSMiklos Szeredi task_lock(task); 186f7ad3c6bSMiklos Szeredi if (task->fs) { 187f7ad3c6bSMiklos Szeredi get_fs_pwd(task->fs, path); 188f7ad3c6bSMiklos Szeredi result = 0; 189f7ad3c6bSMiklos Szeredi } 190f7ad3c6bSMiklos Szeredi task_unlock(task); 19199f89551SEric W. Biederman put_task_struct(task); 19299f89551SEric W. Biederman } 1931da177e4SLinus Torvalds return result; 1941da177e4SLinus Torvalds } 1951da177e4SLinus Torvalds 1967773fbc5SCyrill Gorcunov static int proc_root_link(struct dentry *dentry, struct path *path) 1971da177e4SLinus Torvalds { 1982b0143b5SDavid Howells struct task_struct *task = get_proc_task(d_inode(dentry)); 1991da177e4SLinus Torvalds int result = -ENOENT; 20099f89551SEric W. Biederman 20199f89551SEric W. Biederman if (task) { 202f7ad3c6bSMiklos Szeredi result = get_task_root(task, path); 20399f89551SEric W. Biederman put_task_struct(task); 20499f89551SEric W. Biederman } 2051da177e4SLinus Torvalds return result; 2061da177e4SLinus Torvalds } 2071da177e4SLinus Torvalds 208c2c0bb44SAlexey Dobriyan static ssize_t proc_pid_cmdline_read(struct file *file, char __user *buf, 209c2c0bb44SAlexey Dobriyan size_t _count, loff_t *pos) 2101da177e4SLinus Torvalds { 211c2c0bb44SAlexey Dobriyan struct task_struct *tsk; 212c2c0bb44SAlexey Dobriyan struct mm_struct *mm; 213c2c0bb44SAlexey Dobriyan char *page; 214c2c0bb44SAlexey Dobriyan unsigned long count = _count; 215c2c0bb44SAlexey Dobriyan unsigned long arg_start, arg_end, env_start, env_end; 216c2c0bb44SAlexey Dobriyan unsigned long len1, len2, len; 217c2c0bb44SAlexey Dobriyan unsigned long p; 218c2c0bb44SAlexey Dobriyan char c; 219c2c0bb44SAlexey Dobriyan ssize_t rv; 220c2c0bb44SAlexey Dobriyan 221c2c0bb44SAlexey Dobriyan BUG_ON(*pos < 0); 222c2c0bb44SAlexey Dobriyan 223c2c0bb44SAlexey Dobriyan tsk = get_proc_task(file_inode(file)); 224c2c0bb44SAlexey Dobriyan if (!tsk) 225c2c0bb44SAlexey Dobriyan return -ESRCH; 226c2c0bb44SAlexey Dobriyan mm = get_task_mm(tsk); 227c2c0bb44SAlexey Dobriyan put_task_struct(tsk); 228c2c0bb44SAlexey Dobriyan if (!mm) 2292ca66ff7SAlexey Dobriyan return 0; 230c2c0bb44SAlexey Dobriyan /* Check if process spawned far enough to have cmdline. */ 231c2c0bb44SAlexey Dobriyan if (!mm->env_end) { 232c2c0bb44SAlexey Dobriyan rv = 0; 233c2c0bb44SAlexey Dobriyan goto out_mmput; 2341da177e4SLinus Torvalds } 2351da177e4SLinus Torvalds 2360ee931c4SMichal Hocko page = (char *)__get_free_page(GFP_KERNEL); 237c2c0bb44SAlexey Dobriyan if (!page) { 238c2c0bb44SAlexey Dobriyan rv = -ENOMEM; 239c2c0bb44SAlexey Dobriyan goto out_mmput; 240c2c0bb44SAlexey Dobriyan } 241c2c0bb44SAlexey Dobriyan 242*88aa7cc6SYang Shi spin_lock(&mm->arg_lock); 243c2c0bb44SAlexey Dobriyan arg_start = mm->arg_start; 244c2c0bb44SAlexey Dobriyan arg_end = mm->arg_end; 245c2c0bb44SAlexey Dobriyan env_start = mm->env_start; 246c2c0bb44SAlexey Dobriyan env_end = mm->env_end; 247*88aa7cc6SYang Shi spin_unlock(&mm->arg_lock); 248c2c0bb44SAlexey Dobriyan 249c2c0bb44SAlexey Dobriyan BUG_ON(arg_start > arg_end); 250c2c0bb44SAlexey Dobriyan BUG_ON(env_start > env_end); 251c2c0bb44SAlexey Dobriyan 252c2c0bb44SAlexey Dobriyan len1 = arg_end - arg_start; 253c2c0bb44SAlexey Dobriyan len2 = env_end - env_start; 254c2c0bb44SAlexey Dobriyan 2553581d458SAlexey Dobriyan /* Empty ARGV. */ 2563581d458SAlexey Dobriyan if (len1 == 0) { 2573581d458SAlexey Dobriyan rv = 0; 2583581d458SAlexey Dobriyan goto out_free_page; 2593581d458SAlexey Dobriyan } 260c2c0bb44SAlexey Dobriyan /* 261c2c0bb44SAlexey Dobriyan * Inherently racy -- command line shares address space 262c2c0bb44SAlexey Dobriyan * with code and data. 263c2c0bb44SAlexey Dobriyan */ 2647f7ccc2cSWilly Tarreau rv = access_remote_vm(mm, arg_end - 1, &c, 1, FOLL_ANON); 265c2c0bb44SAlexey Dobriyan if (rv <= 0) 266c2c0bb44SAlexey Dobriyan goto out_free_page; 267c2c0bb44SAlexey Dobriyan 268c2c0bb44SAlexey Dobriyan rv = 0; 269c2c0bb44SAlexey Dobriyan 270c2c0bb44SAlexey Dobriyan if (c == '\0') { 271c2c0bb44SAlexey Dobriyan /* Command line (set of strings) occupies whole ARGV. */ 272c2c0bb44SAlexey Dobriyan if (len1 <= *pos) 273c2c0bb44SAlexey Dobriyan goto out_free_page; 274c2c0bb44SAlexey Dobriyan 275c2c0bb44SAlexey Dobriyan p = arg_start + *pos; 276c2c0bb44SAlexey Dobriyan len = len1 - *pos; 277c2c0bb44SAlexey Dobriyan while (count > 0 && len > 0) { 278c2c0bb44SAlexey Dobriyan unsigned int _count; 279c2c0bb44SAlexey Dobriyan int nr_read; 280c2c0bb44SAlexey Dobriyan 281c2c0bb44SAlexey Dobriyan _count = min3(count, len, PAGE_SIZE); 2827f7ccc2cSWilly Tarreau nr_read = access_remote_vm(mm, p, page, _count, FOLL_ANON); 283c2c0bb44SAlexey Dobriyan if (nr_read < 0) 284c2c0bb44SAlexey Dobriyan rv = nr_read; 285c2c0bb44SAlexey Dobriyan if (nr_read <= 0) 286c2c0bb44SAlexey Dobriyan goto out_free_page; 287c2c0bb44SAlexey Dobriyan 288c2c0bb44SAlexey Dobriyan if (copy_to_user(buf, page, nr_read)) { 289c2c0bb44SAlexey Dobriyan rv = -EFAULT; 290c2c0bb44SAlexey Dobriyan goto out_free_page; 291c2c0bb44SAlexey Dobriyan } 292c2c0bb44SAlexey Dobriyan 293c2c0bb44SAlexey Dobriyan p += nr_read; 294c2c0bb44SAlexey Dobriyan len -= nr_read; 295c2c0bb44SAlexey Dobriyan buf += nr_read; 296c2c0bb44SAlexey Dobriyan count -= nr_read; 297c2c0bb44SAlexey Dobriyan rv += nr_read; 298c2c0bb44SAlexey Dobriyan } 299c2c0bb44SAlexey Dobriyan } else { 300c2c0bb44SAlexey Dobriyan /* 301a0a07b87SAlexey Dobriyan * Command line (1 string) occupies ARGV and 302c2c0bb44SAlexey Dobriyan * extends into ENVP. 303c2c0bb44SAlexey Dobriyan */ 304a0a07b87SAlexey Dobriyan struct { 305a0a07b87SAlexey Dobriyan unsigned long p; 306a0a07b87SAlexey Dobriyan unsigned long len; 307a0a07b87SAlexey Dobriyan } cmdline[2] = { 308a0a07b87SAlexey Dobriyan { .p = arg_start, .len = len1 }, 309a0a07b87SAlexey Dobriyan { .p = env_start, .len = len2 }, 310a0a07b87SAlexey Dobriyan }; 311a0a07b87SAlexey Dobriyan loff_t pos1 = *pos; 312a0a07b87SAlexey Dobriyan unsigned int i; 313c2c0bb44SAlexey Dobriyan 314a0a07b87SAlexey Dobriyan i = 0; 315a0a07b87SAlexey Dobriyan while (i < 2 && pos1 >= cmdline[i].len) { 316a0a07b87SAlexey Dobriyan pos1 -= cmdline[i].len; 317a0a07b87SAlexey Dobriyan i++; 318a0a07b87SAlexey Dobriyan } 319a0a07b87SAlexey Dobriyan while (i < 2) { 320a0a07b87SAlexey Dobriyan p = cmdline[i].p + pos1; 321a0a07b87SAlexey Dobriyan len = cmdline[i].len - pos1; 322c2c0bb44SAlexey Dobriyan while (count > 0 && len > 0) { 323c2c0bb44SAlexey Dobriyan unsigned int _count, l; 324c2c0bb44SAlexey Dobriyan int nr_read; 325c2c0bb44SAlexey Dobriyan bool final; 326c2c0bb44SAlexey Dobriyan 327c2c0bb44SAlexey Dobriyan _count = min3(count, len, PAGE_SIZE); 3287f7ccc2cSWilly Tarreau nr_read = access_remote_vm(mm, p, page, _count, FOLL_ANON); 329c2c0bb44SAlexey Dobriyan if (nr_read < 0) 330c2c0bb44SAlexey Dobriyan rv = nr_read; 331c2c0bb44SAlexey Dobriyan if (nr_read <= 0) 332c2c0bb44SAlexey Dobriyan goto out_free_page; 333c2c0bb44SAlexey Dobriyan 334c2c0bb44SAlexey Dobriyan /* 335c2c0bb44SAlexey Dobriyan * Command line can be shorter than whole ARGV 336c2c0bb44SAlexey Dobriyan * even if last "marker" byte says it is not. 337c2c0bb44SAlexey Dobriyan */ 338c2c0bb44SAlexey Dobriyan final = false; 339c2c0bb44SAlexey Dobriyan l = strnlen(page, nr_read); 340c2c0bb44SAlexey Dobriyan if (l < nr_read) { 341c2c0bb44SAlexey Dobriyan nr_read = l; 342c2c0bb44SAlexey Dobriyan final = true; 343c2c0bb44SAlexey Dobriyan } 344c2c0bb44SAlexey Dobriyan 345c2c0bb44SAlexey Dobriyan if (copy_to_user(buf, page, nr_read)) { 346c2c0bb44SAlexey Dobriyan rv = -EFAULT; 347c2c0bb44SAlexey Dobriyan goto out_free_page; 348c2c0bb44SAlexey Dobriyan } 349c2c0bb44SAlexey Dobriyan 350c2c0bb44SAlexey Dobriyan p += nr_read; 351c2c0bb44SAlexey Dobriyan len -= nr_read; 352c2c0bb44SAlexey Dobriyan buf += nr_read; 353c2c0bb44SAlexey Dobriyan count -= nr_read; 354c2c0bb44SAlexey Dobriyan rv += nr_read; 355c2c0bb44SAlexey Dobriyan 356c2c0bb44SAlexey Dobriyan if (final) 357c2c0bb44SAlexey Dobriyan goto out_free_page; 358c2c0bb44SAlexey Dobriyan } 359a0a07b87SAlexey Dobriyan 360a0a07b87SAlexey Dobriyan /* Only first chunk can be read partially. */ 361a0a07b87SAlexey Dobriyan pos1 = 0; 362a0a07b87SAlexey Dobriyan i++; 363c2c0bb44SAlexey Dobriyan } 364c2c0bb44SAlexey Dobriyan } 365c2c0bb44SAlexey Dobriyan 366c2c0bb44SAlexey Dobriyan out_free_page: 367c2c0bb44SAlexey Dobriyan free_page((unsigned long)page); 368c2c0bb44SAlexey Dobriyan out_mmput: 369c2c0bb44SAlexey Dobriyan mmput(mm); 370c2c0bb44SAlexey Dobriyan if (rv > 0) 371c2c0bb44SAlexey Dobriyan *pos += rv; 372c2c0bb44SAlexey Dobriyan return rv; 373c2c0bb44SAlexey Dobriyan } 374c2c0bb44SAlexey Dobriyan 375c2c0bb44SAlexey Dobriyan static const struct file_operations proc_pid_cmdline_ops = { 376c2c0bb44SAlexey Dobriyan .read = proc_pid_cmdline_read, 377c2c0bb44SAlexey Dobriyan .llseek = generic_file_llseek, 378c2c0bb44SAlexey Dobriyan }; 379c2c0bb44SAlexey Dobriyan 3801da177e4SLinus Torvalds #ifdef CONFIG_KALLSYMS 3811da177e4SLinus Torvalds /* 3821da177e4SLinus Torvalds * Provides a wchan file via kallsyms in a proper one-value-per-file format. 3831da177e4SLinus Torvalds * Returns the resolved symbol. If that fails, simply return the address. 3841da177e4SLinus Torvalds */ 385edfcd606SAlexey Dobriyan static int proc_pid_wchan(struct seq_file *m, struct pid_namespace *ns, 386edfcd606SAlexey Dobriyan struct pid *pid, struct task_struct *task) 3871da177e4SLinus Torvalds { 388ffb45122SAlexey Dobriyan unsigned long wchan; 3899281aceaSTejun Heo char symname[KSYM_NAME_LEN]; 3901da177e4SLinus Torvalds 39124b2ec21SAlexey Dobriyan if (!ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS)) 39224b2ec21SAlexey Dobriyan goto print0; 39324b2ec21SAlexey Dobriyan 3941da177e4SLinus Torvalds wchan = get_wchan(task); 39524b2ec21SAlexey Dobriyan if (wchan && !lookup_symbol_name(wchan, symname)) { 39621dae0adSAlexey Dobriyan seq_puts(m, symname); 39724b2ec21SAlexey Dobriyan return 0; 39824b2ec21SAlexey Dobriyan } 39925ce3191SJoe Perches 40024b2ec21SAlexey Dobriyan print0: 40124b2ec21SAlexey Dobriyan seq_putc(m, '0'); 40225ce3191SJoe Perches return 0; 4031da177e4SLinus Torvalds } 4041da177e4SLinus Torvalds #endif /* CONFIG_KALLSYMS */ 4051da177e4SLinus Torvalds 406a9712bc1SAl Viro static int lock_trace(struct task_struct *task) 407a9712bc1SAl Viro { 408a9712bc1SAl Viro int err = mutex_lock_killable(&task->signal->cred_guard_mutex); 409a9712bc1SAl Viro if (err) 410a9712bc1SAl Viro return err; 411caaee623SJann Horn if (!ptrace_may_access(task, PTRACE_MODE_ATTACH_FSCREDS)) { 412a9712bc1SAl Viro mutex_unlock(&task->signal->cred_guard_mutex); 413a9712bc1SAl Viro return -EPERM; 414a9712bc1SAl Viro } 415a9712bc1SAl Viro return 0; 416a9712bc1SAl Viro } 417a9712bc1SAl Viro 418a9712bc1SAl Viro static void unlock_trace(struct task_struct *task) 419a9712bc1SAl Viro { 420a9712bc1SAl Viro mutex_unlock(&task->signal->cred_guard_mutex); 421a9712bc1SAl Viro } 422a9712bc1SAl Viro 4232ec220e2SKen Chen #ifdef CONFIG_STACKTRACE 4242ec220e2SKen Chen 4252ec220e2SKen Chen #define MAX_STACK_TRACE_DEPTH 64 4262ec220e2SKen Chen 4272ec220e2SKen Chen static int proc_pid_stack(struct seq_file *m, struct pid_namespace *ns, 4282ec220e2SKen Chen struct pid *pid, struct task_struct *task) 4292ec220e2SKen Chen { 4302ec220e2SKen Chen struct stack_trace trace; 4312ec220e2SKen Chen unsigned long *entries; 432a9712bc1SAl Viro int err; 4332ec220e2SKen Chen int i; 4342ec220e2SKen Chen 4352ec220e2SKen Chen entries = kmalloc(MAX_STACK_TRACE_DEPTH * sizeof(*entries), GFP_KERNEL); 4362ec220e2SKen Chen if (!entries) 4372ec220e2SKen Chen return -ENOMEM; 4382ec220e2SKen Chen 4392ec220e2SKen Chen trace.nr_entries = 0; 4402ec220e2SKen Chen trace.max_entries = MAX_STACK_TRACE_DEPTH; 4412ec220e2SKen Chen trace.entries = entries; 4422ec220e2SKen Chen trace.skip = 0; 443a9712bc1SAl Viro 444a9712bc1SAl Viro err = lock_trace(task); 445a9712bc1SAl Viro if (!err) { 4462ec220e2SKen Chen save_stack_trace_tsk(task, &trace); 4472ec220e2SKen Chen 4482ec220e2SKen Chen for (i = 0; i < trace.nr_entries; i++) { 4498f5abe84SLinus Torvalds seq_printf(m, "[<0>] %pB\n", (void *)entries[i]); 4502ec220e2SKen Chen } 451a9712bc1SAl Viro unlock_trace(task); 452a9712bc1SAl Viro } 4532ec220e2SKen Chen kfree(entries); 4542ec220e2SKen Chen 455a9712bc1SAl Viro return err; 4562ec220e2SKen Chen } 4572ec220e2SKen Chen #endif 4582ec220e2SKen Chen 4595968ceceSNaveen N. Rao #ifdef CONFIG_SCHED_INFO 4601da177e4SLinus Torvalds /* 4611da177e4SLinus Torvalds * Provides /proc/PID/schedstat 4621da177e4SLinus Torvalds */ 463f6e826caSAlexey Dobriyan static int proc_pid_schedstat(struct seq_file *m, struct pid_namespace *ns, 464f6e826caSAlexey Dobriyan struct pid *pid, struct task_struct *task) 4651da177e4SLinus Torvalds { 4665968ceceSNaveen N. Rao if (unlikely(!sched_info_on())) 4675968ceceSNaveen N. Rao seq_printf(m, "0 0 0\n"); 4685968ceceSNaveen N. Rao else 46925ce3191SJoe Perches seq_printf(m, "%llu %llu %lu\n", 470826e08b0SIngo Molnar (unsigned long long)task->se.sum_exec_runtime, 471826e08b0SIngo Molnar (unsigned long long)task->sched_info.run_delay, 4722d72376bSIngo Molnar task->sched_info.pcount); 47325ce3191SJoe Perches 47425ce3191SJoe Perches return 0; 4751da177e4SLinus Torvalds } 4761da177e4SLinus Torvalds #endif 4771da177e4SLinus Torvalds 4789745512cSArjan van de Ven #ifdef CONFIG_LATENCYTOP 4799745512cSArjan van de Ven static int lstats_show_proc(struct seq_file *m, void *v) 4809745512cSArjan van de Ven { 4819745512cSArjan van de Ven int i; 48213d77c37SHiroshi Shimamoto struct inode *inode = m->private; 48313d77c37SHiroshi Shimamoto struct task_struct *task = get_proc_task(inode); 4849745512cSArjan van de Ven 48513d77c37SHiroshi Shimamoto if (!task) 48613d77c37SHiroshi Shimamoto return -ESRCH; 48713d77c37SHiroshi Shimamoto seq_puts(m, "Latency Top version : v0.1\n"); 4889745512cSArjan van de Ven for (i = 0; i < 32; i++) { 48934e49d4fSJoe Perches struct latency_record *lr = &task->latency_record[i]; 49034e49d4fSJoe Perches if (lr->backtrace[0]) { 4919745512cSArjan van de Ven int q; 4929745512cSArjan van de Ven seq_printf(m, "%i %li %li", 49334e49d4fSJoe Perches lr->count, lr->time, lr->max); 4949745512cSArjan van de Ven for (q = 0; q < LT_BACKTRACEDEPTH; q++) { 49534e49d4fSJoe Perches unsigned long bt = lr->backtrace[q]; 49634e49d4fSJoe Perches if (!bt) 4979745512cSArjan van de Ven break; 49834e49d4fSJoe Perches if (bt == ULONG_MAX) 4999745512cSArjan van de Ven break; 50034e49d4fSJoe Perches seq_printf(m, " %ps", (void *)bt); 5019745512cSArjan van de Ven } 5029d6de12fSAlexey Dobriyan seq_putc(m, '\n'); 5039745512cSArjan van de Ven } 5049745512cSArjan van de Ven 5059745512cSArjan van de Ven } 50613d77c37SHiroshi Shimamoto put_task_struct(task); 5079745512cSArjan van de Ven return 0; 5089745512cSArjan van de Ven } 5099745512cSArjan van de Ven 5109745512cSArjan van de Ven static int lstats_open(struct inode *inode, struct file *file) 5119745512cSArjan van de Ven { 51213d77c37SHiroshi Shimamoto return single_open(file, lstats_show_proc, inode); 513d6643d12SHiroshi Shimamoto } 514d6643d12SHiroshi Shimamoto 5159745512cSArjan van de Ven static ssize_t lstats_write(struct file *file, const char __user *buf, 5169745512cSArjan van de Ven size_t count, loff_t *offs) 5179745512cSArjan van de Ven { 518496ad9aaSAl Viro struct task_struct *task = get_proc_task(file_inode(file)); 5199745512cSArjan van de Ven 52013d77c37SHiroshi Shimamoto if (!task) 52113d77c37SHiroshi Shimamoto return -ESRCH; 5229745512cSArjan van de Ven clear_all_latency_tracing(task); 52313d77c37SHiroshi Shimamoto put_task_struct(task); 5249745512cSArjan van de Ven 5259745512cSArjan van de Ven return count; 5269745512cSArjan van de Ven } 5279745512cSArjan van de Ven 5289745512cSArjan van de Ven static const struct file_operations proc_lstats_operations = { 5299745512cSArjan van de Ven .open = lstats_open, 5309745512cSArjan van de Ven .read = seq_read, 5319745512cSArjan van de Ven .write = lstats_write, 5329745512cSArjan van de Ven .llseek = seq_lseek, 53313d77c37SHiroshi Shimamoto .release = single_release, 5349745512cSArjan van de Ven }; 5359745512cSArjan van de Ven 5369745512cSArjan van de Ven #endif 5379745512cSArjan van de Ven 5386ba51e37SAlexey Dobriyan static int proc_oom_score(struct seq_file *m, struct pid_namespace *ns, 5396ba51e37SAlexey Dobriyan struct pid *pid, struct task_struct *task) 5401da177e4SLinus Torvalds { 541a7f638f9SDavid Rientjes unsigned long totalpages = totalram_pages + total_swap_pages; 542b95c35e7SOleg Nesterov unsigned long points = 0; 5431da177e4SLinus Torvalds 544a7f638f9SDavid Rientjes points = oom_badness(task, NULL, NULL, totalpages) * 545a7f638f9SDavid Rientjes 1000 / totalpages; 54625ce3191SJoe Perches seq_printf(m, "%lu\n", points); 54725ce3191SJoe Perches 54825ce3191SJoe Perches return 0; 5491da177e4SLinus Torvalds } 5501da177e4SLinus Torvalds 551d85f50d5SNeil Horman struct limit_names { 552cedbccabSAlexey Dobriyan const char *name; 553cedbccabSAlexey Dobriyan const char *unit; 554d85f50d5SNeil Horman }; 555d85f50d5SNeil Horman 556d85f50d5SNeil Horman static const struct limit_names lnames[RLIM_NLIMITS] = { 557cff4edb5SKees Cook [RLIMIT_CPU] = {"Max cpu time", "seconds"}, 558d85f50d5SNeil Horman [RLIMIT_FSIZE] = {"Max file size", "bytes"}, 559d85f50d5SNeil Horman [RLIMIT_DATA] = {"Max data size", "bytes"}, 560d85f50d5SNeil Horman [RLIMIT_STACK] = {"Max stack size", "bytes"}, 561d85f50d5SNeil Horman [RLIMIT_CORE] = {"Max core file size", "bytes"}, 562d85f50d5SNeil Horman [RLIMIT_RSS] = {"Max resident set", "bytes"}, 563d85f50d5SNeil Horman [RLIMIT_NPROC] = {"Max processes", "processes"}, 564d85f50d5SNeil Horman [RLIMIT_NOFILE] = {"Max open files", "files"}, 565d85f50d5SNeil Horman [RLIMIT_MEMLOCK] = {"Max locked memory", "bytes"}, 566d85f50d5SNeil Horman [RLIMIT_AS] = {"Max address space", "bytes"}, 567d85f50d5SNeil Horman [RLIMIT_LOCKS] = {"Max file locks", "locks"}, 568d85f50d5SNeil Horman [RLIMIT_SIGPENDING] = {"Max pending signals", "signals"}, 569d85f50d5SNeil Horman [RLIMIT_MSGQUEUE] = {"Max msgqueue size", "bytes"}, 570d85f50d5SNeil Horman [RLIMIT_NICE] = {"Max nice priority", NULL}, 571d85f50d5SNeil Horman [RLIMIT_RTPRIO] = {"Max realtime priority", NULL}, 5728808117cSEugene Teo [RLIMIT_RTTIME] = {"Max realtime timeout", "us"}, 573d85f50d5SNeil Horman }; 574d85f50d5SNeil Horman 575d85f50d5SNeil Horman /* Display limits for a process */ 5761c963eb1SAlexey Dobriyan static int proc_pid_limits(struct seq_file *m, struct pid_namespace *ns, 5771c963eb1SAlexey Dobriyan struct pid *pid, struct task_struct *task) 578d85f50d5SNeil Horman { 579d85f50d5SNeil Horman unsigned int i; 580d85f50d5SNeil Horman unsigned long flags; 581d85f50d5SNeil Horman 582d85f50d5SNeil Horman struct rlimit rlim[RLIM_NLIMITS]; 583d85f50d5SNeil Horman 584a6bebbc8SLai Jiangshan if (!lock_task_sighand(task, &flags)) 585d85f50d5SNeil Horman return 0; 586d85f50d5SNeil Horman memcpy(rlim, task->signal->rlim, sizeof(struct rlimit) * RLIM_NLIMITS); 587d85f50d5SNeil Horman unlock_task_sighand(task, &flags); 588d85f50d5SNeil Horman 589d85f50d5SNeil Horman /* 590d85f50d5SNeil Horman * print the file header 591d85f50d5SNeil Horman */ 5921c963eb1SAlexey Dobriyan seq_printf(m, "%-25s %-20s %-20s %-10s\n", 593d85f50d5SNeil Horman "Limit", "Soft Limit", "Hard Limit", "Units"); 594d85f50d5SNeil Horman 595d85f50d5SNeil Horman for (i = 0; i < RLIM_NLIMITS; i++) { 596d85f50d5SNeil Horman if (rlim[i].rlim_cur == RLIM_INFINITY) 5971c963eb1SAlexey Dobriyan seq_printf(m, "%-25s %-20s ", 598d85f50d5SNeil Horman lnames[i].name, "unlimited"); 599d85f50d5SNeil Horman else 6001c963eb1SAlexey Dobriyan seq_printf(m, "%-25s %-20lu ", 601d85f50d5SNeil Horman lnames[i].name, rlim[i].rlim_cur); 602d85f50d5SNeil Horman 603d85f50d5SNeil Horman if (rlim[i].rlim_max == RLIM_INFINITY) 6041c963eb1SAlexey Dobriyan seq_printf(m, "%-20s ", "unlimited"); 605d85f50d5SNeil Horman else 6061c963eb1SAlexey Dobriyan seq_printf(m, "%-20lu ", rlim[i].rlim_max); 607d85f50d5SNeil Horman 608d85f50d5SNeil Horman if (lnames[i].unit) 6091c963eb1SAlexey Dobriyan seq_printf(m, "%-10s\n", lnames[i].unit); 610d85f50d5SNeil Horman else 6111c963eb1SAlexey Dobriyan seq_putc(m, '\n'); 612d85f50d5SNeil Horman } 613d85f50d5SNeil Horman 6141c963eb1SAlexey Dobriyan return 0; 615d85f50d5SNeil Horman } 616d85f50d5SNeil Horman 617ebcb6734SRoland McGrath #ifdef CONFIG_HAVE_ARCH_TRACEHOOK 61809d93bd6SAlexey Dobriyan static int proc_pid_syscall(struct seq_file *m, struct pid_namespace *ns, 61909d93bd6SAlexey Dobriyan struct pid *pid, struct task_struct *task) 620ebcb6734SRoland McGrath { 621ebcb6734SRoland McGrath long nr; 622ebcb6734SRoland McGrath unsigned long args[6], sp, pc; 62325ce3191SJoe Perches int res; 62425ce3191SJoe Perches 62525ce3191SJoe Perches res = lock_trace(task); 626a9712bc1SAl Viro if (res) 627a9712bc1SAl Viro return res; 628ebcb6734SRoland McGrath 629ebcb6734SRoland McGrath if (task_current_syscall(task, &nr, args, 6, &sp, &pc)) 63009d93bd6SAlexey Dobriyan seq_puts(m, "running\n"); 631a9712bc1SAl Viro else if (nr < 0) 63209d93bd6SAlexey Dobriyan seq_printf(m, "%ld 0x%lx 0x%lx\n", nr, sp, pc); 633a9712bc1SAl Viro else 63409d93bd6SAlexey Dobriyan seq_printf(m, 635ebcb6734SRoland McGrath "%ld 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx\n", 636ebcb6734SRoland McGrath nr, 637ebcb6734SRoland McGrath args[0], args[1], args[2], args[3], args[4], args[5], 638ebcb6734SRoland McGrath sp, pc); 639a9712bc1SAl Viro unlock_trace(task); 64025ce3191SJoe Perches 64125ce3191SJoe Perches return 0; 642ebcb6734SRoland McGrath } 643ebcb6734SRoland McGrath #endif /* CONFIG_HAVE_ARCH_TRACEHOOK */ 644ebcb6734SRoland McGrath 6451da177e4SLinus Torvalds /************************************************************************/ 6461da177e4SLinus Torvalds /* Here the fs part begins */ 6471da177e4SLinus Torvalds /************************************************************************/ 6481da177e4SLinus Torvalds 6491da177e4SLinus Torvalds /* permission checks */ 650778c1144SEric W. Biederman static int proc_fd_access_allowed(struct inode *inode) 6511da177e4SLinus Torvalds { 652778c1144SEric W. Biederman struct task_struct *task; 653778c1144SEric W. Biederman int allowed = 0; 654df26c40eSEric W. Biederman /* Allow access to a task's file descriptors if it is us or we 655df26c40eSEric W. Biederman * may use ptrace attach to the process and find out that 656df26c40eSEric W. Biederman * information. 657778c1144SEric W. Biederman */ 658778c1144SEric W. Biederman task = get_proc_task(inode); 659df26c40eSEric W. Biederman if (task) { 660caaee623SJann Horn allowed = ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS); 661778c1144SEric W. Biederman put_task_struct(task); 662df26c40eSEric W. Biederman } 663778c1144SEric W. Biederman return allowed; 6641da177e4SLinus Torvalds } 6651da177e4SLinus Torvalds 6666b4e306aSEric W. Biederman int proc_setattr(struct dentry *dentry, struct iattr *attr) 6676d76fa58SLinus Torvalds { 6686d76fa58SLinus Torvalds int error; 6692b0143b5SDavid Howells struct inode *inode = d_inode(dentry); 6706d76fa58SLinus Torvalds 6716d76fa58SLinus Torvalds if (attr->ia_valid & ATTR_MODE) 6726d76fa58SLinus Torvalds return -EPERM; 6736d76fa58SLinus Torvalds 67431051c85SJan Kara error = setattr_prepare(dentry, attr); 6751025774cSChristoph Hellwig if (error) 6766d76fa58SLinus Torvalds return error; 6771025774cSChristoph Hellwig 6781025774cSChristoph Hellwig setattr_copy(inode, attr); 6791025774cSChristoph Hellwig mark_inode_dirty(inode); 6801025774cSChristoph Hellwig return 0; 6816d76fa58SLinus Torvalds } 6826d76fa58SLinus Torvalds 6830499680aSVasiliy Kulikov /* 6840499680aSVasiliy Kulikov * May current process learn task's sched/cmdline info (for hide_pid_min=1) 6850499680aSVasiliy Kulikov * or euid/egid (for hide_pid_min=2)? 6860499680aSVasiliy Kulikov */ 6870499680aSVasiliy Kulikov static bool has_pid_permissions(struct pid_namespace *pid, 6880499680aSVasiliy Kulikov struct task_struct *task, 6890499680aSVasiliy Kulikov int hide_pid_min) 6900499680aSVasiliy Kulikov { 6910499680aSVasiliy Kulikov if (pid->hide_pid < hide_pid_min) 6920499680aSVasiliy Kulikov return true; 6930499680aSVasiliy Kulikov if (in_group_p(pid->pid_gid)) 6940499680aSVasiliy Kulikov return true; 695caaee623SJann Horn return ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS); 6960499680aSVasiliy Kulikov } 6970499680aSVasiliy Kulikov 6980499680aSVasiliy Kulikov 6990499680aSVasiliy Kulikov static int proc_pid_permission(struct inode *inode, int mask) 7000499680aSVasiliy Kulikov { 70176f668beSChristoph Hellwig struct pid_namespace *pid = proc_pid_ns(inode); 7020499680aSVasiliy Kulikov struct task_struct *task; 7030499680aSVasiliy Kulikov bool has_perms; 7040499680aSVasiliy Kulikov 7050499680aSVasiliy Kulikov task = get_proc_task(inode); 706a2ef990aSXiaotian Feng if (!task) 707a2ef990aSXiaotian Feng return -ESRCH; 708796f571bSLafcadio Wluiki has_perms = has_pid_permissions(pid, task, HIDEPID_NO_ACCESS); 7090499680aSVasiliy Kulikov put_task_struct(task); 7100499680aSVasiliy Kulikov 7110499680aSVasiliy Kulikov if (!has_perms) { 712796f571bSLafcadio Wluiki if (pid->hide_pid == HIDEPID_INVISIBLE) { 7130499680aSVasiliy Kulikov /* 7140499680aSVasiliy Kulikov * Let's make getdents(), stat(), and open() 7150499680aSVasiliy Kulikov * consistent with each other. If a process 7160499680aSVasiliy Kulikov * may not stat() a file, it shouldn't be seen 7170499680aSVasiliy Kulikov * in procfs at all. 7180499680aSVasiliy Kulikov */ 7190499680aSVasiliy Kulikov return -ENOENT; 7200499680aSVasiliy Kulikov } 7210499680aSVasiliy Kulikov 7220499680aSVasiliy Kulikov return -EPERM; 7230499680aSVasiliy Kulikov } 7240499680aSVasiliy Kulikov return generic_permission(inode, mask); 7250499680aSVasiliy Kulikov } 7260499680aSVasiliy Kulikov 7270499680aSVasiliy Kulikov 7280499680aSVasiliy Kulikov 729c5ef1c42SArjan van de Ven static const struct inode_operations proc_def_inode_operations = { 7306d76fa58SLinus Torvalds .setattr = proc_setattr, 7316d76fa58SLinus Torvalds }; 7326d76fa58SLinus Torvalds 733be614086SEric W. Biederman static int proc_single_show(struct seq_file *m, void *v) 734be614086SEric W. Biederman { 735be614086SEric W. Biederman struct inode *inode = m->private; 73676f668beSChristoph Hellwig struct pid_namespace *ns = proc_pid_ns(inode); 73776f668beSChristoph Hellwig struct pid *pid = proc_pid(inode); 738be614086SEric W. Biederman struct task_struct *task; 739be614086SEric W. Biederman int ret; 740be614086SEric W. Biederman 741be614086SEric W. Biederman task = get_pid_task(pid, PIDTYPE_PID); 742be614086SEric W. Biederman if (!task) 743be614086SEric W. Biederman return -ESRCH; 744be614086SEric W. Biederman 745be614086SEric W. Biederman ret = PROC_I(inode)->op.proc_show(m, ns, pid, task); 746be614086SEric W. Biederman 747be614086SEric W. Biederman put_task_struct(task); 748be614086SEric W. Biederman return ret; 749be614086SEric W. Biederman } 750be614086SEric W. Biederman 751be614086SEric W. Biederman static int proc_single_open(struct inode *inode, struct file *filp) 752be614086SEric W. Biederman { 753c6a34058SJovi Zhang return single_open(filp, proc_single_show, inode); 754be614086SEric W. Biederman } 755be614086SEric W. Biederman 756be614086SEric W. Biederman static const struct file_operations proc_single_file_operations = { 757be614086SEric W. Biederman .open = proc_single_open, 758be614086SEric W. Biederman .read = seq_read, 759be614086SEric W. Biederman .llseek = seq_lseek, 760be614086SEric W. Biederman .release = single_release, 761be614086SEric W. Biederman }; 762be614086SEric W. Biederman 7635381e169SOleg Nesterov 7645381e169SOleg Nesterov struct mm_struct *proc_mem_open(struct inode *inode, unsigned int mode) 7651da177e4SLinus Torvalds { 7665381e169SOleg Nesterov struct task_struct *task = get_proc_task(inode); 7675381e169SOleg Nesterov struct mm_struct *mm = ERR_PTR(-ESRCH); 768e268337dSLinus Torvalds 7695381e169SOleg Nesterov if (task) { 770caaee623SJann Horn mm = mm_access(task, mode | PTRACE_MODE_FSCREDS); 771e268337dSLinus Torvalds put_task_struct(task); 772e268337dSLinus Torvalds 7735381e169SOleg Nesterov if (!IS_ERR_OR_NULL(mm)) { 7746d08f2c7SOleg Nesterov /* ensure this mm_struct can't be freed */ 775f1f10076SVegard Nossum mmgrab(mm); 7766d08f2c7SOleg Nesterov /* but do not pin its memory */ 7776d08f2c7SOleg Nesterov mmput(mm); 7786d08f2c7SOleg Nesterov } 7795381e169SOleg Nesterov } 7805381e169SOleg Nesterov 7815381e169SOleg Nesterov return mm; 7825381e169SOleg Nesterov } 7835381e169SOleg Nesterov 7845381e169SOleg Nesterov static int __mem_open(struct inode *inode, struct file *file, unsigned int mode) 7855381e169SOleg Nesterov { 7865381e169SOleg Nesterov struct mm_struct *mm = proc_mem_open(inode, mode); 7875381e169SOleg Nesterov 7885381e169SOleg Nesterov if (IS_ERR(mm)) 7895381e169SOleg Nesterov return PTR_ERR(mm); 7906d08f2c7SOleg Nesterov 791e268337dSLinus Torvalds file->private_data = mm; 7921da177e4SLinus Torvalds return 0; 7931da177e4SLinus Torvalds } 7941da177e4SLinus Torvalds 795b409e578SCong Wang static int mem_open(struct inode *inode, struct file *file) 796b409e578SCong Wang { 797bc452b4bSDjalal Harouni int ret = __mem_open(inode, file, PTRACE_MODE_ATTACH); 798bc452b4bSDjalal Harouni 799bc452b4bSDjalal Harouni /* OK to pass negative loff_t, we can catch out-of-range */ 800bc452b4bSDjalal Harouni file->f_mode |= FMODE_UNSIGNED_OFFSET; 801bc452b4bSDjalal Harouni 802bc452b4bSDjalal Harouni return ret; 803b409e578SCong Wang } 804b409e578SCong Wang 805572d34b9SOleg Nesterov static ssize_t mem_rw(struct file *file, char __user *buf, 806572d34b9SOleg Nesterov size_t count, loff_t *ppos, int write) 8071da177e4SLinus Torvalds { 808e268337dSLinus Torvalds struct mm_struct *mm = file->private_data; 809572d34b9SOleg Nesterov unsigned long addr = *ppos; 810572d34b9SOleg Nesterov ssize_t copied; 8111da177e4SLinus Torvalds char *page; 812272ddc8bSLinus Torvalds unsigned int flags; 8131da177e4SLinus Torvalds 814e268337dSLinus Torvalds if (!mm) 815e268337dSLinus Torvalds return 0; 8161da177e4SLinus Torvalds 8170ee931c4SMichal Hocko page = (char *)__get_free_page(GFP_KERNEL); 8181da177e4SLinus Torvalds if (!page) 819e268337dSLinus Torvalds return -ENOMEM; 8201da177e4SLinus Torvalds 821f7ca54f4SFrederik Deweerdt copied = 0; 822388f7934SVegard Nossum if (!mmget_not_zero(mm)) 8236d08f2c7SOleg Nesterov goto free; 8246d08f2c7SOleg Nesterov 825f511c0b1SLinus Torvalds flags = FOLL_FORCE | (write ? FOLL_WRITE : 0); 8266347e8d5SLorenzo Stoakes 8271da177e4SLinus Torvalds while (count > 0) { 828572d34b9SOleg Nesterov int this_len = min_t(int, count, PAGE_SIZE); 8291da177e4SLinus Torvalds 830572d34b9SOleg Nesterov if (write && copy_from_user(page, buf, this_len)) { 8311da177e4SLinus Torvalds copied = -EFAULT; 8321da177e4SLinus Torvalds break; 8331da177e4SLinus Torvalds } 834572d34b9SOleg Nesterov 8356347e8d5SLorenzo Stoakes this_len = access_remote_vm(mm, addr, page, this_len, flags); 836572d34b9SOleg Nesterov if (!this_len) { 8371da177e4SLinus Torvalds if (!copied) 8381da177e4SLinus Torvalds copied = -EIO; 8391da177e4SLinus Torvalds break; 8401da177e4SLinus Torvalds } 841572d34b9SOleg Nesterov 842572d34b9SOleg Nesterov if (!write && copy_to_user(buf, page, this_len)) { 843572d34b9SOleg Nesterov copied = -EFAULT; 844572d34b9SOleg Nesterov break; 8451da177e4SLinus Torvalds } 846572d34b9SOleg Nesterov 847572d34b9SOleg Nesterov buf += this_len; 848572d34b9SOleg Nesterov addr += this_len; 849572d34b9SOleg Nesterov copied += this_len; 850572d34b9SOleg Nesterov count -= this_len; 851572d34b9SOleg Nesterov } 852572d34b9SOleg Nesterov *ppos = addr; 85330cd8903SKOSAKI Motohiro 8546d08f2c7SOleg Nesterov mmput(mm); 8556d08f2c7SOleg Nesterov free: 85630cd8903SKOSAKI Motohiro free_page((unsigned long) page); 8571da177e4SLinus Torvalds return copied; 8581da177e4SLinus Torvalds } 8591da177e4SLinus Torvalds 860572d34b9SOleg Nesterov static ssize_t mem_read(struct file *file, char __user *buf, 861572d34b9SOleg Nesterov size_t count, loff_t *ppos) 862572d34b9SOleg Nesterov { 863572d34b9SOleg Nesterov return mem_rw(file, buf, count, ppos, 0); 864572d34b9SOleg Nesterov } 865572d34b9SOleg Nesterov 866572d34b9SOleg Nesterov static ssize_t mem_write(struct file *file, const char __user *buf, 867572d34b9SOleg Nesterov size_t count, loff_t *ppos) 868572d34b9SOleg Nesterov { 869572d34b9SOleg Nesterov return mem_rw(file, (char __user*)buf, count, ppos, 1); 870572d34b9SOleg Nesterov } 871572d34b9SOleg Nesterov 87285863e47SMatt Mackall loff_t mem_lseek(struct file *file, loff_t offset, int orig) 8731da177e4SLinus Torvalds { 8741da177e4SLinus Torvalds switch (orig) { 8751da177e4SLinus Torvalds case 0: 8761da177e4SLinus Torvalds file->f_pos = offset; 8771da177e4SLinus Torvalds break; 8781da177e4SLinus Torvalds case 1: 8791da177e4SLinus Torvalds file->f_pos += offset; 8801da177e4SLinus Torvalds break; 8811da177e4SLinus Torvalds default: 8821da177e4SLinus Torvalds return -EINVAL; 8831da177e4SLinus Torvalds } 8841da177e4SLinus Torvalds force_successful_syscall_return(); 8851da177e4SLinus Torvalds return file->f_pos; 8861da177e4SLinus Torvalds } 8871da177e4SLinus Torvalds 888e268337dSLinus Torvalds static int mem_release(struct inode *inode, struct file *file) 889e268337dSLinus Torvalds { 890e268337dSLinus Torvalds struct mm_struct *mm = file->private_data; 89171879d3cSOleg Nesterov if (mm) 8926d08f2c7SOleg Nesterov mmdrop(mm); 893e268337dSLinus Torvalds return 0; 894e268337dSLinus Torvalds } 895e268337dSLinus Torvalds 89600977a59SArjan van de Ven static const struct file_operations proc_mem_operations = { 8971da177e4SLinus Torvalds .llseek = mem_lseek, 8981da177e4SLinus Torvalds .read = mem_read, 8991da177e4SLinus Torvalds .write = mem_write, 9001da177e4SLinus Torvalds .open = mem_open, 901e268337dSLinus Torvalds .release = mem_release, 9021da177e4SLinus Torvalds }; 9031da177e4SLinus Torvalds 904b409e578SCong Wang static int environ_open(struct inode *inode, struct file *file) 905b409e578SCong Wang { 906b409e578SCong Wang return __mem_open(inode, file, PTRACE_MODE_READ); 907b409e578SCong Wang } 908b409e578SCong Wang 909315e28c8SJames Pearson static ssize_t environ_read(struct file *file, char __user *buf, 910315e28c8SJames Pearson size_t count, loff_t *ppos) 911315e28c8SJames Pearson { 912315e28c8SJames Pearson char *page; 913315e28c8SJames Pearson unsigned long src = *ppos; 914b409e578SCong Wang int ret = 0; 915b409e578SCong Wang struct mm_struct *mm = file->private_data; 916a3b609efSMateusz Guzik unsigned long env_start, env_end; 917315e28c8SJames Pearson 9188148a73cSMathias Krause /* Ensure the process spawned far enough to have an environment. */ 9198148a73cSMathias Krause if (!mm || !mm->env_end) 920b409e578SCong Wang return 0; 921315e28c8SJames Pearson 9220ee931c4SMichal Hocko page = (char *)__get_free_page(GFP_KERNEL); 923315e28c8SJames Pearson if (!page) 924b409e578SCong Wang return -ENOMEM; 925315e28c8SJames Pearson 926d6f64b89SAl Viro ret = 0; 927388f7934SVegard Nossum if (!mmget_not_zero(mm)) 928b409e578SCong Wang goto free; 929a3b609efSMateusz Guzik 930*88aa7cc6SYang Shi spin_lock(&mm->arg_lock); 931a3b609efSMateusz Guzik env_start = mm->env_start; 932a3b609efSMateusz Guzik env_end = mm->env_end; 933*88aa7cc6SYang Shi spin_unlock(&mm->arg_lock); 934a3b609efSMateusz Guzik 935315e28c8SJames Pearson while (count > 0) { 936e8905ec2SDjalal Harouni size_t this_len, max_len; 937e8905ec2SDjalal Harouni int retval; 938e8905ec2SDjalal Harouni 939a3b609efSMateusz Guzik if (src >= (env_end - env_start)) 940e8905ec2SDjalal Harouni break; 941315e28c8SJames Pearson 942a3b609efSMateusz Guzik this_len = env_end - (env_start + src); 943315e28c8SJames Pearson 944e8905ec2SDjalal Harouni max_len = min_t(size_t, PAGE_SIZE, count); 945e8905ec2SDjalal Harouni this_len = min(max_len, this_len); 946315e28c8SJames Pearson 9477f7ccc2cSWilly Tarreau retval = access_remote_vm(mm, (env_start + src), page, this_len, FOLL_ANON); 948315e28c8SJames Pearson 949315e28c8SJames Pearson if (retval <= 0) { 950315e28c8SJames Pearson ret = retval; 951315e28c8SJames Pearson break; 952315e28c8SJames Pearson } 953315e28c8SJames Pearson 954315e28c8SJames Pearson if (copy_to_user(buf, page, retval)) { 955315e28c8SJames Pearson ret = -EFAULT; 956315e28c8SJames Pearson break; 957315e28c8SJames Pearson } 958315e28c8SJames Pearson 959315e28c8SJames Pearson ret += retval; 960315e28c8SJames Pearson src += retval; 961315e28c8SJames Pearson buf += retval; 962315e28c8SJames Pearson count -= retval; 963315e28c8SJames Pearson } 964315e28c8SJames Pearson *ppos = src; 965315e28c8SJames Pearson mmput(mm); 966b409e578SCong Wang 967b409e578SCong Wang free: 968315e28c8SJames Pearson free_page((unsigned long) page); 969315e28c8SJames Pearson return ret; 970315e28c8SJames Pearson } 971315e28c8SJames Pearson 972315e28c8SJames Pearson static const struct file_operations proc_environ_operations = { 973b409e578SCong Wang .open = environ_open, 974315e28c8SJames Pearson .read = environ_read, 97587df8424SArnd Bergmann .llseek = generic_file_llseek, 976b409e578SCong Wang .release = mem_release, 977315e28c8SJames Pearson }; 978315e28c8SJames Pearson 979c5317167SAl Viro static int auxv_open(struct inode *inode, struct file *file) 980c5317167SAl Viro { 981c5317167SAl Viro return __mem_open(inode, file, PTRACE_MODE_READ_FSCREDS); 982c5317167SAl Viro } 983c5317167SAl Viro 984c5317167SAl Viro static ssize_t auxv_read(struct file *file, char __user *buf, 985c5317167SAl Viro size_t count, loff_t *ppos) 986c5317167SAl Viro { 987c5317167SAl Viro struct mm_struct *mm = file->private_data; 988c5317167SAl Viro unsigned int nwords = 0; 98906b2849dSLeon Yu 99006b2849dSLeon Yu if (!mm) 99106b2849dSLeon Yu return 0; 992c5317167SAl Viro do { 993c5317167SAl Viro nwords += 2; 994c5317167SAl Viro } while (mm->saved_auxv[nwords - 2] != 0); /* AT_NULL */ 995c5317167SAl Viro return simple_read_from_buffer(buf, count, ppos, mm->saved_auxv, 996c5317167SAl Viro nwords * sizeof(mm->saved_auxv[0])); 997c5317167SAl Viro } 998c5317167SAl Viro 999c5317167SAl Viro static const struct file_operations proc_auxv_operations = { 1000c5317167SAl Viro .open = auxv_open, 1001c5317167SAl Viro .read = auxv_read, 1002c5317167SAl Viro .llseek = generic_file_llseek, 1003c5317167SAl Viro .release = mem_release, 1004c5317167SAl Viro }; 1005c5317167SAl Viro 1006fa0cbbf1SDavid Rientjes static ssize_t oom_adj_read(struct file *file, char __user *buf, size_t count, 1007fa0cbbf1SDavid Rientjes loff_t *ppos) 1008fa0cbbf1SDavid Rientjes { 1009496ad9aaSAl Viro struct task_struct *task = get_proc_task(file_inode(file)); 1010fa0cbbf1SDavid Rientjes char buffer[PROC_NUMBUF]; 1011fa0cbbf1SDavid Rientjes int oom_adj = OOM_ADJUST_MIN; 1012fa0cbbf1SDavid Rientjes size_t len; 1013fa0cbbf1SDavid Rientjes 1014fa0cbbf1SDavid Rientjes if (!task) 1015fa0cbbf1SDavid Rientjes return -ESRCH; 1016fa0cbbf1SDavid Rientjes if (task->signal->oom_score_adj == OOM_SCORE_ADJ_MAX) 1017fa0cbbf1SDavid Rientjes oom_adj = OOM_ADJUST_MAX; 1018fa0cbbf1SDavid Rientjes else 1019fa0cbbf1SDavid Rientjes oom_adj = (task->signal->oom_score_adj * -OOM_DISABLE) / 1020fa0cbbf1SDavid Rientjes OOM_SCORE_ADJ_MAX; 1021fa0cbbf1SDavid Rientjes put_task_struct(task); 1022fa0cbbf1SDavid Rientjes len = snprintf(buffer, sizeof(buffer), "%d\n", oom_adj); 1023fa0cbbf1SDavid Rientjes return simple_read_from_buffer(buf, count, ppos, buffer, len); 1024fa0cbbf1SDavid Rientjes } 1025fa0cbbf1SDavid Rientjes 10261d5f0acbSMichal Hocko static int __set_oom_adj(struct file *file, int oom_adj, bool legacy) 10271d5f0acbSMichal Hocko { 1028f913da59SMichal Hocko static DEFINE_MUTEX(oom_adj_mutex); 102944a70adeSMichal Hocko struct mm_struct *mm = NULL; 10301d5f0acbSMichal Hocko struct task_struct *task; 10311d5f0acbSMichal Hocko int err = 0; 10321d5f0acbSMichal Hocko 10331d5f0acbSMichal Hocko task = get_proc_task(file_inode(file)); 10341d5f0acbSMichal Hocko if (!task) 10351d5f0acbSMichal Hocko return -ESRCH; 10361d5f0acbSMichal Hocko 10371d5f0acbSMichal Hocko mutex_lock(&oom_adj_mutex); 10381d5f0acbSMichal Hocko if (legacy) { 10391d5f0acbSMichal Hocko if (oom_adj < task->signal->oom_score_adj && 10401d5f0acbSMichal Hocko !capable(CAP_SYS_RESOURCE)) { 10411d5f0acbSMichal Hocko err = -EACCES; 10421d5f0acbSMichal Hocko goto err_unlock; 10431d5f0acbSMichal Hocko } 10441d5f0acbSMichal Hocko /* 10451d5f0acbSMichal Hocko * /proc/pid/oom_adj is provided for legacy purposes, ask users to use 10461d5f0acbSMichal Hocko * /proc/pid/oom_score_adj instead. 10471d5f0acbSMichal Hocko */ 10481d5f0acbSMichal Hocko pr_warn_once("%s (%d): /proc/%d/oom_adj is deprecated, please use /proc/%d/oom_score_adj instead.\n", 10491d5f0acbSMichal Hocko current->comm, task_pid_nr(current), task_pid_nr(task), 10501d5f0acbSMichal Hocko task_pid_nr(task)); 10511d5f0acbSMichal Hocko } else { 10521d5f0acbSMichal Hocko if ((short)oom_adj < task->signal->oom_score_adj_min && 10531d5f0acbSMichal Hocko !capable(CAP_SYS_RESOURCE)) { 10541d5f0acbSMichal Hocko err = -EACCES; 10551d5f0acbSMichal Hocko goto err_unlock; 10561d5f0acbSMichal Hocko } 10571d5f0acbSMichal Hocko } 10581d5f0acbSMichal Hocko 105944a70adeSMichal Hocko /* 106044a70adeSMichal Hocko * Make sure we will check other processes sharing the mm if this is 106144a70adeSMichal Hocko * not vfrok which wants its own oom_score_adj. 106244a70adeSMichal Hocko * pin the mm so it doesn't go away and get reused after task_unlock 106344a70adeSMichal Hocko */ 106444a70adeSMichal Hocko if (!task->vfork_done) { 106544a70adeSMichal Hocko struct task_struct *p = find_lock_task_mm(task); 106644a70adeSMichal Hocko 106744a70adeSMichal Hocko if (p) { 106844a70adeSMichal Hocko if (atomic_read(&p->mm->mm_users) > 1) { 106944a70adeSMichal Hocko mm = p->mm; 1070f1f10076SVegard Nossum mmgrab(mm); 107144a70adeSMichal Hocko } 107244a70adeSMichal Hocko task_unlock(p); 107344a70adeSMichal Hocko } 107444a70adeSMichal Hocko } 107544a70adeSMichal Hocko 10761d5f0acbSMichal Hocko task->signal->oom_score_adj = oom_adj; 10771d5f0acbSMichal Hocko if (!legacy && has_capability_noaudit(current, CAP_SYS_RESOURCE)) 10781d5f0acbSMichal Hocko task->signal->oom_score_adj_min = (short)oom_adj; 10791d5f0acbSMichal Hocko trace_oom_score_adj_update(task); 108044a70adeSMichal Hocko 108144a70adeSMichal Hocko if (mm) { 108244a70adeSMichal Hocko struct task_struct *p; 108344a70adeSMichal Hocko 108444a70adeSMichal Hocko rcu_read_lock(); 108544a70adeSMichal Hocko for_each_process(p) { 108644a70adeSMichal Hocko if (same_thread_group(task, p)) 108744a70adeSMichal Hocko continue; 108844a70adeSMichal Hocko 108944a70adeSMichal Hocko /* do not touch kernel threads or the global init */ 109044a70adeSMichal Hocko if (p->flags & PF_KTHREAD || is_global_init(p)) 109144a70adeSMichal Hocko continue; 109244a70adeSMichal Hocko 109344a70adeSMichal Hocko task_lock(p); 109444a70adeSMichal Hocko if (!p->vfork_done && process_shares_mm(p, mm)) { 109544a70adeSMichal Hocko pr_info("updating oom_score_adj for %d (%s) from %d to %d because it shares mm with %d (%s). Report if this is unexpected.\n", 109644a70adeSMichal Hocko task_pid_nr(p), p->comm, 109744a70adeSMichal Hocko p->signal->oom_score_adj, oom_adj, 109844a70adeSMichal Hocko task_pid_nr(task), task->comm); 109944a70adeSMichal Hocko p->signal->oom_score_adj = oom_adj; 110044a70adeSMichal Hocko if (!legacy && has_capability_noaudit(current, CAP_SYS_RESOURCE)) 110144a70adeSMichal Hocko p->signal->oom_score_adj_min = (short)oom_adj; 110244a70adeSMichal Hocko } 110344a70adeSMichal Hocko task_unlock(p); 110444a70adeSMichal Hocko } 110544a70adeSMichal Hocko rcu_read_unlock(); 110644a70adeSMichal Hocko mmdrop(mm); 110744a70adeSMichal Hocko } 11081d5f0acbSMichal Hocko err_unlock: 11091d5f0acbSMichal Hocko mutex_unlock(&oom_adj_mutex); 11101d5f0acbSMichal Hocko put_task_struct(task); 11111d5f0acbSMichal Hocko return err; 11121d5f0acbSMichal Hocko } 1113f913da59SMichal Hocko 1114b72bdfa7SDavid Rientjes /* 1115b72bdfa7SDavid Rientjes * /proc/pid/oom_adj exists solely for backwards compatibility with previous 1116b72bdfa7SDavid Rientjes * kernels. The effective policy is defined by oom_score_adj, which has a 1117b72bdfa7SDavid Rientjes * different scale: oom_adj grew exponentially and oom_score_adj grows linearly. 1118b72bdfa7SDavid Rientjes * Values written to oom_adj are simply mapped linearly to oom_score_adj. 1119b72bdfa7SDavid Rientjes * Processes that become oom disabled via oom_adj will still be oom disabled 1120b72bdfa7SDavid Rientjes * with this implementation. 1121b72bdfa7SDavid Rientjes * 1122b72bdfa7SDavid Rientjes * oom_adj cannot be removed since existing userspace binaries use it. 1123b72bdfa7SDavid Rientjes */ 1124fa0cbbf1SDavid Rientjes static ssize_t oom_adj_write(struct file *file, const char __user *buf, 1125fa0cbbf1SDavid Rientjes size_t count, loff_t *ppos) 1126fa0cbbf1SDavid Rientjes { 1127fa0cbbf1SDavid Rientjes char buffer[PROC_NUMBUF]; 1128fa0cbbf1SDavid Rientjes int oom_adj; 1129fa0cbbf1SDavid Rientjes int err; 1130fa0cbbf1SDavid Rientjes 1131fa0cbbf1SDavid Rientjes memset(buffer, 0, sizeof(buffer)); 1132fa0cbbf1SDavid Rientjes if (count > sizeof(buffer) - 1) 1133fa0cbbf1SDavid Rientjes count = sizeof(buffer) - 1; 1134fa0cbbf1SDavid Rientjes if (copy_from_user(buffer, buf, count)) { 1135fa0cbbf1SDavid Rientjes err = -EFAULT; 1136fa0cbbf1SDavid Rientjes goto out; 1137fa0cbbf1SDavid Rientjes } 1138fa0cbbf1SDavid Rientjes 1139fa0cbbf1SDavid Rientjes err = kstrtoint(strstrip(buffer), 0, &oom_adj); 1140fa0cbbf1SDavid Rientjes if (err) 1141fa0cbbf1SDavid Rientjes goto out; 1142fa0cbbf1SDavid Rientjes if ((oom_adj < OOM_ADJUST_MIN || oom_adj > OOM_ADJUST_MAX) && 1143fa0cbbf1SDavid Rientjes oom_adj != OOM_DISABLE) { 1144fa0cbbf1SDavid Rientjes err = -EINVAL; 1145fa0cbbf1SDavid Rientjes goto out; 1146fa0cbbf1SDavid Rientjes } 1147fa0cbbf1SDavid Rientjes 1148fa0cbbf1SDavid Rientjes /* 1149fa0cbbf1SDavid Rientjes * Scale /proc/pid/oom_score_adj appropriately ensuring that a maximum 1150fa0cbbf1SDavid Rientjes * value is always attainable. 1151fa0cbbf1SDavid Rientjes */ 1152fa0cbbf1SDavid Rientjes if (oom_adj == OOM_ADJUST_MAX) 1153fa0cbbf1SDavid Rientjes oom_adj = OOM_SCORE_ADJ_MAX; 1154fa0cbbf1SDavid Rientjes else 1155fa0cbbf1SDavid Rientjes oom_adj = (oom_adj * OOM_SCORE_ADJ_MAX) / -OOM_DISABLE; 1156fa0cbbf1SDavid Rientjes 11571d5f0acbSMichal Hocko err = __set_oom_adj(file, oom_adj, true); 1158fa0cbbf1SDavid Rientjes out: 1159fa0cbbf1SDavid Rientjes return err < 0 ? err : count; 1160fa0cbbf1SDavid Rientjes } 1161fa0cbbf1SDavid Rientjes 1162fa0cbbf1SDavid Rientjes static const struct file_operations proc_oom_adj_operations = { 1163fa0cbbf1SDavid Rientjes .read = oom_adj_read, 1164fa0cbbf1SDavid Rientjes .write = oom_adj_write, 1165fa0cbbf1SDavid Rientjes .llseek = generic_file_llseek, 1166fa0cbbf1SDavid Rientjes }; 1167fa0cbbf1SDavid Rientjes 1168a63d83f4SDavid Rientjes static ssize_t oom_score_adj_read(struct file *file, char __user *buf, 1169a63d83f4SDavid Rientjes size_t count, loff_t *ppos) 1170a63d83f4SDavid Rientjes { 1171496ad9aaSAl Viro struct task_struct *task = get_proc_task(file_inode(file)); 1172a63d83f4SDavid Rientjes char buffer[PROC_NUMBUF]; 1173a9c58b90SDavid Rientjes short oom_score_adj = OOM_SCORE_ADJ_MIN; 1174a63d83f4SDavid Rientjes size_t len; 1175a63d83f4SDavid Rientjes 1176a63d83f4SDavid Rientjes if (!task) 1177a63d83f4SDavid Rientjes return -ESRCH; 1178a63d83f4SDavid Rientjes oom_score_adj = task->signal->oom_score_adj; 1179a63d83f4SDavid Rientjes put_task_struct(task); 1180a9c58b90SDavid Rientjes len = snprintf(buffer, sizeof(buffer), "%hd\n", oom_score_adj); 1181a63d83f4SDavid Rientjes return simple_read_from_buffer(buf, count, ppos, buffer, len); 1182a63d83f4SDavid Rientjes } 1183a63d83f4SDavid Rientjes 1184a63d83f4SDavid Rientjes static ssize_t oom_score_adj_write(struct file *file, const char __user *buf, 1185a63d83f4SDavid Rientjes size_t count, loff_t *ppos) 1186a63d83f4SDavid Rientjes { 1187a63d83f4SDavid Rientjes char buffer[PROC_NUMBUF]; 11880a8cb8e3SAlexey Dobriyan int oom_score_adj; 1189a63d83f4SDavid Rientjes int err; 1190a63d83f4SDavid Rientjes 1191a63d83f4SDavid Rientjes memset(buffer, 0, sizeof(buffer)); 1192a63d83f4SDavid Rientjes if (count > sizeof(buffer) - 1) 1193a63d83f4SDavid Rientjes count = sizeof(buffer) - 1; 1194723548bfSDavid Rientjes if (copy_from_user(buffer, buf, count)) { 1195723548bfSDavid Rientjes err = -EFAULT; 1196723548bfSDavid Rientjes goto out; 1197723548bfSDavid Rientjes } 1198a63d83f4SDavid Rientjes 11990a8cb8e3SAlexey Dobriyan err = kstrtoint(strstrip(buffer), 0, &oom_score_adj); 1200a63d83f4SDavid Rientjes if (err) 1201723548bfSDavid Rientjes goto out; 1202a63d83f4SDavid Rientjes if (oom_score_adj < OOM_SCORE_ADJ_MIN || 1203723548bfSDavid Rientjes oom_score_adj > OOM_SCORE_ADJ_MAX) { 1204723548bfSDavid Rientjes err = -EINVAL; 1205723548bfSDavid Rientjes goto out; 1206723548bfSDavid Rientjes } 1207a63d83f4SDavid Rientjes 12081d5f0acbSMichal Hocko err = __set_oom_adj(file, oom_score_adj, false); 1209723548bfSDavid Rientjes out: 1210723548bfSDavid Rientjes return err < 0 ? err : count; 1211a63d83f4SDavid Rientjes } 1212a63d83f4SDavid Rientjes 1213a63d83f4SDavid Rientjes static const struct file_operations proc_oom_score_adj_operations = { 1214a63d83f4SDavid Rientjes .read = oom_score_adj_read, 1215a63d83f4SDavid Rientjes .write = oom_score_adj_write, 12166038f373SArnd Bergmann .llseek = default_llseek, 1217a63d83f4SDavid Rientjes }; 1218a63d83f4SDavid Rientjes 12191da177e4SLinus Torvalds #ifdef CONFIG_AUDITSYSCALL 1220b4eb4f7fSAlexey Dobriyan #define TMPBUFLEN 11 12211da177e4SLinus Torvalds static ssize_t proc_loginuid_read(struct file * file, char __user * buf, 12221da177e4SLinus Torvalds size_t count, loff_t *ppos) 12231da177e4SLinus Torvalds { 1224496ad9aaSAl Viro struct inode * inode = file_inode(file); 122599f89551SEric W. Biederman struct task_struct *task = get_proc_task(inode); 12261da177e4SLinus Torvalds ssize_t length; 12271da177e4SLinus Torvalds char tmpbuf[TMPBUFLEN]; 12281da177e4SLinus Torvalds 122999f89551SEric W. Biederman if (!task) 123099f89551SEric W. Biederman return -ESRCH; 12311da177e4SLinus Torvalds length = scnprintf(tmpbuf, TMPBUFLEN, "%u", 1232e1760bd5SEric W. Biederman from_kuid(file->f_cred->user_ns, 1233e1760bd5SEric W. Biederman audit_get_loginuid(task))); 123499f89551SEric W. Biederman put_task_struct(task); 12351da177e4SLinus Torvalds return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); 12361da177e4SLinus Torvalds } 12371da177e4SLinus Torvalds 12381da177e4SLinus Torvalds static ssize_t proc_loginuid_write(struct file * file, const char __user * buf, 12391da177e4SLinus Torvalds size_t count, loff_t *ppos) 12401da177e4SLinus Torvalds { 1241496ad9aaSAl Viro struct inode * inode = file_inode(file); 12421da177e4SLinus Torvalds uid_t loginuid; 1243e1760bd5SEric W. Biederman kuid_t kloginuid; 1244774636e1SAlexey Dobriyan int rv; 12451da177e4SLinus Torvalds 12467dc52157SPaul E. McKenney rcu_read_lock(); 12477dc52157SPaul E. McKenney if (current != pid_task(proc_pid(inode), PIDTYPE_PID)) { 12487dc52157SPaul E. McKenney rcu_read_unlock(); 12491da177e4SLinus Torvalds return -EPERM; 12507dc52157SPaul E. McKenney } 12517dc52157SPaul E. McKenney rcu_read_unlock(); 12521da177e4SLinus Torvalds 12531da177e4SLinus Torvalds if (*ppos != 0) { 12541da177e4SLinus Torvalds /* No partial writes. */ 12551da177e4SLinus Torvalds return -EINVAL; 12561da177e4SLinus Torvalds } 12571da177e4SLinus Torvalds 1258774636e1SAlexey Dobriyan rv = kstrtou32_from_user(buf, count, 10, &loginuid); 1259774636e1SAlexey Dobriyan if (rv < 0) 1260774636e1SAlexey Dobriyan return rv; 126181407c84SEric Paris 126281407c84SEric Paris /* is userspace tring to explicitly UNSET the loginuid? */ 126381407c84SEric Paris if (loginuid == AUDIT_UID_UNSET) { 126481407c84SEric Paris kloginuid = INVALID_UID; 126581407c84SEric Paris } else { 1266e1760bd5SEric W. Biederman kloginuid = make_kuid(file->f_cred->user_ns, loginuid); 1267774636e1SAlexey Dobriyan if (!uid_valid(kloginuid)) 1268774636e1SAlexey Dobriyan return -EINVAL; 126981407c84SEric Paris } 1270e1760bd5SEric W. Biederman 1271774636e1SAlexey Dobriyan rv = audit_set_loginuid(kloginuid); 1272774636e1SAlexey Dobriyan if (rv < 0) 1273774636e1SAlexey Dobriyan return rv; 1274774636e1SAlexey Dobriyan return count; 12751da177e4SLinus Torvalds } 12761da177e4SLinus Torvalds 127700977a59SArjan van de Ven static const struct file_operations proc_loginuid_operations = { 12781da177e4SLinus Torvalds .read = proc_loginuid_read, 12791da177e4SLinus Torvalds .write = proc_loginuid_write, 128087df8424SArnd Bergmann .llseek = generic_file_llseek, 12811da177e4SLinus Torvalds }; 12821e0bd755SEric Paris 12831e0bd755SEric Paris static ssize_t proc_sessionid_read(struct file * file, char __user * buf, 12841e0bd755SEric Paris size_t count, loff_t *ppos) 12851e0bd755SEric Paris { 1286496ad9aaSAl Viro struct inode * inode = file_inode(file); 12871e0bd755SEric Paris struct task_struct *task = get_proc_task(inode); 12881e0bd755SEric Paris ssize_t length; 12891e0bd755SEric Paris char tmpbuf[TMPBUFLEN]; 12901e0bd755SEric Paris 12911e0bd755SEric Paris if (!task) 12921e0bd755SEric Paris return -ESRCH; 12931e0bd755SEric Paris length = scnprintf(tmpbuf, TMPBUFLEN, "%u", 12941e0bd755SEric Paris audit_get_sessionid(task)); 12951e0bd755SEric Paris put_task_struct(task); 12961e0bd755SEric Paris return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); 12971e0bd755SEric Paris } 12981e0bd755SEric Paris 12991e0bd755SEric Paris static const struct file_operations proc_sessionid_operations = { 13001e0bd755SEric Paris .read = proc_sessionid_read, 130187df8424SArnd Bergmann .llseek = generic_file_llseek, 13021e0bd755SEric Paris }; 13031da177e4SLinus Torvalds #endif 13041da177e4SLinus Torvalds 1305f4f154fdSAkinobu Mita #ifdef CONFIG_FAULT_INJECTION 1306f4f154fdSAkinobu Mita static ssize_t proc_fault_inject_read(struct file * file, char __user * buf, 1307f4f154fdSAkinobu Mita size_t count, loff_t *ppos) 1308f4f154fdSAkinobu Mita { 1309496ad9aaSAl Viro struct task_struct *task = get_proc_task(file_inode(file)); 1310f4f154fdSAkinobu Mita char buffer[PROC_NUMBUF]; 1311f4f154fdSAkinobu Mita size_t len; 1312f4f154fdSAkinobu Mita int make_it_fail; 1313f4f154fdSAkinobu Mita 1314f4f154fdSAkinobu Mita if (!task) 1315f4f154fdSAkinobu Mita return -ESRCH; 1316f4f154fdSAkinobu Mita make_it_fail = task->make_it_fail; 1317f4f154fdSAkinobu Mita put_task_struct(task); 1318f4f154fdSAkinobu Mita 1319f4f154fdSAkinobu Mita len = snprintf(buffer, sizeof(buffer), "%i\n", make_it_fail); 13200c28f287SAkinobu Mita 13210c28f287SAkinobu Mita return simple_read_from_buffer(buf, count, ppos, buffer, len); 1322f4f154fdSAkinobu Mita } 1323f4f154fdSAkinobu Mita 1324f4f154fdSAkinobu Mita static ssize_t proc_fault_inject_write(struct file * file, 1325f4f154fdSAkinobu Mita const char __user * buf, size_t count, loff_t *ppos) 1326f4f154fdSAkinobu Mita { 1327f4f154fdSAkinobu Mita struct task_struct *task; 1328774636e1SAlexey Dobriyan char buffer[PROC_NUMBUF]; 1329f4f154fdSAkinobu Mita int make_it_fail; 1330774636e1SAlexey Dobriyan int rv; 1331f4f154fdSAkinobu Mita 1332f4f154fdSAkinobu Mita if (!capable(CAP_SYS_RESOURCE)) 1333f4f154fdSAkinobu Mita return -EPERM; 1334f4f154fdSAkinobu Mita memset(buffer, 0, sizeof(buffer)); 1335f4f154fdSAkinobu Mita if (count > sizeof(buffer) - 1) 1336f4f154fdSAkinobu Mita count = sizeof(buffer) - 1; 1337f4f154fdSAkinobu Mita if (copy_from_user(buffer, buf, count)) 1338f4f154fdSAkinobu Mita return -EFAULT; 1339774636e1SAlexey Dobriyan rv = kstrtoint(strstrip(buffer), 0, &make_it_fail); 1340774636e1SAlexey Dobriyan if (rv < 0) 1341774636e1SAlexey Dobriyan return rv; 134216caed31SDave Jones if (make_it_fail < 0 || make_it_fail > 1) 134316caed31SDave Jones return -EINVAL; 134416caed31SDave Jones 1345496ad9aaSAl Viro task = get_proc_task(file_inode(file)); 1346f4f154fdSAkinobu Mita if (!task) 1347f4f154fdSAkinobu Mita return -ESRCH; 1348f4f154fdSAkinobu Mita task->make_it_fail = make_it_fail; 1349f4f154fdSAkinobu Mita put_task_struct(task); 1350cba8aafeSVincent Li 1351cba8aafeSVincent Li return count; 1352f4f154fdSAkinobu Mita } 1353f4f154fdSAkinobu Mita 135400977a59SArjan van de Ven static const struct file_operations proc_fault_inject_operations = { 1355f4f154fdSAkinobu Mita .read = proc_fault_inject_read, 1356f4f154fdSAkinobu Mita .write = proc_fault_inject_write, 135787df8424SArnd Bergmann .llseek = generic_file_llseek, 1358f4f154fdSAkinobu Mita }; 1359e41d5818SDmitry Vyukov 1360e41d5818SDmitry Vyukov static ssize_t proc_fail_nth_write(struct file *file, const char __user *buf, 1361e41d5818SDmitry Vyukov size_t count, loff_t *ppos) 1362e41d5818SDmitry Vyukov { 1363e41d5818SDmitry Vyukov struct task_struct *task; 13649049f2f6SAkinobu Mita int err; 13659049f2f6SAkinobu Mita unsigned int n; 1366e41d5818SDmitry Vyukov 13679049f2f6SAkinobu Mita err = kstrtouint_from_user(buf, count, 0, &n); 1368e41d5818SDmitry Vyukov if (err) 1369e41d5818SDmitry Vyukov return err; 13701203c8e6SAkinobu Mita 13711203c8e6SAkinobu Mita task = get_proc_task(file_inode(file)); 13721203c8e6SAkinobu Mita if (!task) 13731203c8e6SAkinobu Mita return -ESRCH; 13749f7118b2SAlexey Dobriyan task->fail_nth = n; 13751203c8e6SAkinobu Mita put_task_struct(task); 13761203c8e6SAkinobu Mita 1377e41d5818SDmitry Vyukov return count; 1378e41d5818SDmitry Vyukov } 1379e41d5818SDmitry Vyukov 1380e41d5818SDmitry Vyukov static ssize_t proc_fail_nth_read(struct file *file, char __user *buf, 1381e41d5818SDmitry Vyukov size_t count, loff_t *ppos) 1382e41d5818SDmitry Vyukov { 1383e41d5818SDmitry Vyukov struct task_struct *task; 1384bfc74093SAkinobu Mita char numbuf[PROC_NUMBUF]; 1385bfc74093SAkinobu Mita ssize_t len; 1386e41d5818SDmitry Vyukov 1387e41d5818SDmitry Vyukov task = get_proc_task(file_inode(file)); 1388e41d5818SDmitry Vyukov if (!task) 1389e41d5818SDmitry Vyukov return -ESRCH; 13909f7118b2SAlexey Dobriyan len = snprintf(numbuf, sizeof(numbuf), "%u\n", task->fail_nth); 1391bfc74093SAkinobu Mita len = simple_read_from_buffer(buf, count, ppos, numbuf, len); 13921203c8e6SAkinobu Mita put_task_struct(task); 1393bfc74093SAkinobu Mita 1394bfc74093SAkinobu Mita return len; 1395e41d5818SDmitry Vyukov } 1396e41d5818SDmitry Vyukov 1397e41d5818SDmitry Vyukov static const struct file_operations proc_fail_nth_operations = { 1398e41d5818SDmitry Vyukov .read = proc_fail_nth_read, 1399e41d5818SDmitry Vyukov .write = proc_fail_nth_write, 1400e41d5818SDmitry Vyukov }; 1401f4f154fdSAkinobu Mita #endif 1402f4f154fdSAkinobu Mita 14039745512cSArjan van de Ven 140443ae34cbSIngo Molnar #ifdef CONFIG_SCHED_DEBUG 140543ae34cbSIngo Molnar /* 140643ae34cbSIngo Molnar * Print out various scheduling related per-task fields: 140743ae34cbSIngo Molnar */ 140843ae34cbSIngo Molnar static int sched_show(struct seq_file *m, void *v) 140943ae34cbSIngo Molnar { 141043ae34cbSIngo Molnar struct inode *inode = m->private; 141176f668beSChristoph Hellwig struct pid_namespace *ns = proc_pid_ns(inode); 141243ae34cbSIngo Molnar struct task_struct *p; 141343ae34cbSIngo Molnar 141443ae34cbSIngo Molnar p = get_proc_task(inode); 141543ae34cbSIngo Molnar if (!p) 141643ae34cbSIngo Molnar return -ESRCH; 141774dc3384SAleksa Sarai proc_sched_show_task(p, ns, m); 141843ae34cbSIngo Molnar 141943ae34cbSIngo Molnar put_task_struct(p); 142043ae34cbSIngo Molnar 142143ae34cbSIngo Molnar return 0; 142243ae34cbSIngo Molnar } 142343ae34cbSIngo Molnar 142443ae34cbSIngo Molnar static ssize_t 142543ae34cbSIngo Molnar sched_write(struct file *file, const char __user *buf, 142643ae34cbSIngo Molnar size_t count, loff_t *offset) 142743ae34cbSIngo Molnar { 1428496ad9aaSAl Viro struct inode *inode = file_inode(file); 142943ae34cbSIngo Molnar struct task_struct *p; 143043ae34cbSIngo Molnar 143143ae34cbSIngo Molnar p = get_proc_task(inode); 143243ae34cbSIngo Molnar if (!p) 143343ae34cbSIngo Molnar return -ESRCH; 143443ae34cbSIngo Molnar proc_sched_set_task(p); 143543ae34cbSIngo Molnar 143643ae34cbSIngo Molnar put_task_struct(p); 143743ae34cbSIngo Molnar 143843ae34cbSIngo Molnar return count; 143943ae34cbSIngo Molnar } 144043ae34cbSIngo Molnar 144143ae34cbSIngo Molnar static int sched_open(struct inode *inode, struct file *filp) 144243ae34cbSIngo Molnar { 1443c6a34058SJovi Zhang return single_open(filp, sched_show, inode); 144443ae34cbSIngo Molnar } 144543ae34cbSIngo Molnar 144643ae34cbSIngo Molnar static const struct file_operations proc_pid_sched_operations = { 144743ae34cbSIngo Molnar .open = sched_open, 144843ae34cbSIngo Molnar .read = seq_read, 144943ae34cbSIngo Molnar .write = sched_write, 145043ae34cbSIngo Molnar .llseek = seq_lseek, 14515ea473a1SAlexey Dobriyan .release = single_release, 145243ae34cbSIngo Molnar }; 145343ae34cbSIngo Molnar 145443ae34cbSIngo Molnar #endif 145543ae34cbSIngo Molnar 14565091faa4SMike Galbraith #ifdef CONFIG_SCHED_AUTOGROUP 14575091faa4SMike Galbraith /* 14585091faa4SMike Galbraith * Print out autogroup related information: 14595091faa4SMike Galbraith */ 14605091faa4SMike Galbraith static int sched_autogroup_show(struct seq_file *m, void *v) 14615091faa4SMike Galbraith { 14625091faa4SMike Galbraith struct inode *inode = m->private; 14635091faa4SMike Galbraith struct task_struct *p; 14645091faa4SMike Galbraith 14655091faa4SMike Galbraith p = get_proc_task(inode); 14665091faa4SMike Galbraith if (!p) 14675091faa4SMike Galbraith return -ESRCH; 14685091faa4SMike Galbraith proc_sched_autogroup_show_task(p, m); 14695091faa4SMike Galbraith 14705091faa4SMike Galbraith put_task_struct(p); 14715091faa4SMike Galbraith 14725091faa4SMike Galbraith return 0; 14735091faa4SMike Galbraith } 14745091faa4SMike Galbraith 14755091faa4SMike Galbraith static ssize_t 14765091faa4SMike Galbraith sched_autogroup_write(struct file *file, const char __user *buf, 14775091faa4SMike Galbraith size_t count, loff_t *offset) 14785091faa4SMike Galbraith { 1479496ad9aaSAl Viro struct inode *inode = file_inode(file); 14805091faa4SMike Galbraith struct task_struct *p; 14815091faa4SMike Galbraith char buffer[PROC_NUMBUF]; 14820a8cb8e3SAlexey Dobriyan int nice; 14835091faa4SMike Galbraith int err; 14845091faa4SMike Galbraith 14855091faa4SMike Galbraith memset(buffer, 0, sizeof(buffer)); 14865091faa4SMike Galbraith if (count > sizeof(buffer) - 1) 14875091faa4SMike Galbraith count = sizeof(buffer) - 1; 14885091faa4SMike Galbraith if (copy_from_user(buffer, buf, count)) 14895091faa4SMike Galbraith return -EFAULT; 14905091faa4SMike Galbraith 14910a8cb8e3SAlexey Dobriyan err = kstrtoint(strstrip(buffer), 0, &nice); 14920a8cb8e3SAlexey Dobriyan if (err < 0) 14930a8cb8e3SAlexey Dobriyan return err; 14945091faa4SMike Galbraith 14955091faa4SMike Galbraith p = get_proc_task(inode); 14965091faa4SMike Galbraith if (!p) 14975091faa4SMike Galbraith return -ESRCH; 14985091faa4SMike Galbraith 14992e5b5b3aSHiroshi Shimamoto err = proc_sched_autogroup_set_nice(p, nice); 15005091faa4SMike Galbraith if (err) 15015091faa4SMike Galbraith count = err; 15025091faa4SMike Galbraith 15035091faa4SMike Galbraith put_task_struct(p); 15045091faa4SMike Galbraith 15055091faa4SMike Galbraith return count; 15065091faa4SMike Galbraith } 15075091faa4SMike Galbraith 15085091faa4SMike Galbraith static int sched_autogroup_open(struct inode *inode, struct file *filp) 15095091faa4SMike Galbraith { 15105091faa4SMike Galbraith int ret; 15115091faa4SMike Galbraith 15125091faa4SMike Galbraith ret = single_open(filp, sched_autogroup_show, NULL); 15135091faa4SMike Galbraith if (!ret) { 15145091faa4SMike Galbraith struct seq_file *m = filp->private_data; 15155091faa4SMike Galbraith 15165091faa4SMike Galbraith m->private = inode; 15175091faa4SMike Galbraith } 15185091faa4SMike Galbraith return ret; 15195091faa4SMike Galbraith } 15205091faa4SMike Galbraith 15215091faa4SMike Galbraith static const struct file_operations proc_pid_sched_autogroup_operations = { 15225091faa4SMike Galbraith .open = sched_autogroup_open, 15235091faa4SMike Galbraith .read = seq_read, 15245091faa4SMike Galbraith .write = sched_autogroup_write, 15255091faa4SMike Galbraith .llseek = seq_lseek, 15265091faa4SMike Galbraith .release = single_release, 15275091faa4SMike Galbraith }; 15285091faa4SMike Galbraith 15295091faa4SMike Galbraith #endif /* CONFIG_SCHED_AUTOGROUP */ 15305091faa4SMike Galbraith 15314614a696Sjohn stultz static ssize_t comm_write(struct file *file, const char __user *buf, 15324614a696Sjohn stultz size_t count, loff_t *offset) 15334614a696Sjohn stultz { 1534496ad9aaSAl Viro struct inode *inode = file_inode(file); 15354614a696Sjohn stultz struct task_struct *p; 15364614a696Sjohn stultz char buffer[TASK_COMM_LEN]; 1537830e0fc9SDavid Rientjes const size_t maxlen = sizeof(buffer) - 1; 15384614a696Sjohn stultz 15394614a696Sjohn stultz memset(buffer, 0, sizeof(buffer)); 1540830e0fc9SDavid Rientjes if (copy_from_user(buffer, buf, count > maxlen ? maxlen : count)) 15414614a696Sjohn stultz return -EFAULT; 15424614a696Sjohn stultz 15434614a696Sjohn stultz p = get_proc_task(inode); 15444614a696Sjohn stultz if (!p) 15454614a696Sjohn stultz return -ESRCH; 15464614a696Sjohn stultz 15474614a696Sjohn stultz if (same_thread_group(current, p)) 15484614a696Sjohn stultz set_task_comm(p, buffer); 15494614a696Sjohn stultz else 15504614a696Sjohn stultz count = -EINVAL; 15514614a696Sjohn stultz 15524614a696Sjohn stultz put_task_struct(p); 15534614a696Sjohn stultz 15544614a696Sjohn stultz return count; 15554614a696Sjohn stultz } 15564614a696Sjohn stultz 15574614a696Sjohn stultz static int comm_show(struct seq_file *m, void *v) 15584614a696Sjohn stultz { 15594614a696Sjohn stultz struct inode *inode = m->private; 15604614a696Sjohn stultz struct task_struct *p; 15614614a696Sjohn stultz 15624614a696Sjohn stultz p = get_proc_task(inode); 15634614a696Sjohn stultz if (!p) 15644614a696Sjohn stultz return -ESRCH; 15654614a696Sjohn stultz 156688b72b31STejun Heo proc_task_name(m, p, false); 156788b72b31STejun Heo seq_putc(m, '\n'); 15684614a696Sjohn stultz 15694614a696Sjohn stultz put_task_struct(p); 15704614a696Sjohn stultz 15714614a696Sjohn stultz return 0; 15724614a696Sjohn stultz } 15734614a696Sjohn stultz 15744614a696Sjohn stultz static int comm_open(struct inode *inode, struct file *filp) 15754614a696Sjohn stultz { 1576c6a34058SJovi Zhang return single_open(filp, comm_show, inode); 15774614a696Sjohn stultz } 15784614a696Sjohn stultz 15794614a696Sjohn stultz static const struct file_operations proc_pid_set_comm_operations = { 15804614a696Sjohn stultz .open = comm_open, 15814614a696Sjohn stultz .read = seq_read, 15824614a696Sjohn stultz .write = comm_write, 15834614a696Sjohn stultz .llseek = seq_lseek, 15844614a696Sjohn stultz .release = single_release, 15854614a696Sjohn stultz }; 15864614a696Sjohn stultz 15877773fbc5SCyrill Gorcunov static int proc_exe_link(struct dentry *dentry, struct path *exe_path) 1588925d1c40SMatt Helsley { 1589925d1c40SMatt Helsley struct task_struct *task; 1590925d1c40SMatt Helsley struct file *exe_file; 1591925d1c40SMatt Helsley 15922b0143b5SDavid Howells task = get_proc_task(d_inode(dentry)); 1593925d1c40SMatt Helsley if (!task) 1594925d1c40SMatt Helsley return -ENOENT; 1595cd81a917SMateusz Guzik exe_file = get_task_exe_file(task); 1596925d1c40SMatt Helsley put_task_struct(task); 1597925d1c40SMatt Helsley if (exe_file) { 1598925d1c40SMatt Helsley *exe_path = exe_file->f_path; 1599925d1c40SMatt Helsley path_get(&exe_file->f_path); 1600925d1c40SMatt Helsley fput(exe_file); 1601925d1c40SMatt Helsley return 0; 1602925d1c40SMatt Helsley } else 1603925d1c40SMatt Helsley return -ENOENT; 1604925d1c40SMatt Helsley } 1605925d1c40SMatt Helsley 16066b255391SAl Viro static const char *proc_pid_get_link(struct dentry *dentry, 1607fceef393SAl Viro struct inode *inode, 1608fceef393SAl Viro struct delayed_call *done) 16091da177e4SLinus Torvalds { 1610408ef013SChristoph Hellwig struct path path; 16111da177e4SLinus Torvalds int error = -EACCES; 16121da177e4SLinus Torvalds 16136b255391SAl Viro if (!dentry) 16146b255391SAl Viro return ERR_PTR(-ECHILD); 16156b255391SAl Viro 1616778c1144SEric W. Biederman /* Are we allowed to snoop on the tasks file descriptors? */ 1617778c1144SEric W. Biederman if (!proc_fd_access_allowed(inode)) 16181da177e4SLinus Torvalds goto out; 16191da177e4SLinus Torvalds 1620408ef013SChristoph Hellwig error = PROC_I(inode)->op.proc_get_link(dentry, &path); 1621408ef013SChristoph Hellwig if (error) 1622408ef013SChristoph Hellwig goto out; 1623408ef013SChristoph Hellwig 16246e77137bSAl Viro nd_jump_link(&path); 1625408ef013SChristoph Hellwig return NULL; 16261da177e4SLinus Torvalds out: 1627008b150aSAl Viro return ERR_PTR(error); 16281da177e4SLinus Torvalds } 16291da177e4SLinus Torvalds 16303dcd25f3SJan Blunck static int do_proc_readlink(struct path *path, char __user *buffer, int buflen) 16311da177e4SLinus Torvalds { 16320ee931c4SMichal Hocko char *tmp = (char *)__get_free_page(GFP_KERNEL); 16333dcd25f3SJan Blunck char *pathname; 16341da177e4SLinus Torvalds int len; 16351da177e4SLinus Torvalds 16361da177e4SLinus Torvalds if (!tmp) 16371da177e4SLinus Torvalds return -ENOMEM; 16381da177e4SLinus Torvalds 16397b2a69baSEric W. Biederman pathname = d_path(path, tmp, PAGE_SIZE); 16403dcd25f3SJan Blunck len = PTR_ERR(pathname); 16413dcd25f3SJan Blunck if (IS_ERR(pathname)) 16421da177e4SLinus Torvalds goto out; 16433dcd25f3SJan Blunck len = tmp + PAGE_SIZE - 1 - pathname; 16441da177e4SLinus Torvalds 16451da177e4SLinus Torvalds if (len > buflen) 16461da177e4SLinus Torvalds len = buflen; 16473dcd25f3SJan Blunck if (copy_to_user(buffer, pathname, len)) 16481da177e4SLinus Torvalds len = -EFAULT; 16491da177e4SLinus Torvalds out: 16501da177e4SLinus Torvalds free_page((unsigned long)tmp); 16511da177e4SLinus Torvalds return len; 16521da177e4SLinus Torvalds } 16531da177e4SLinus Torvalds 16541da177e4SLinus Torvalds static int proc_pid_readlink(struct dentry * dentry, char __user * buffer, int buflen) 16551da177e4SLinus Torvalds { 16561da177e4SLinus Torvalds int error = -EACCES; 16572b0143b5SDavid Howells struct inode *inode = d_inode(dentry); 16583dcd25f3SJan Blunck struct path path; 16591da177e4SLinus Torvalds 1660778c1144SEric W. Biederman /* Are we allowed to snoop on the tasks file descriptors? */ 1661778c1144SEric W. Biederman if (!proc_fd_access_allowed(inode)) 16621da177e4SLinus Torvalds goto out; 16631da177e4SLinus Torvalds 16647773fbc5SCyrill Gorcunov error = PROC_I(inode)->op.proc_get_link(dentry, &path); 16651da177e4SLinus Torvalds if (error) 16661da177e4SLinus Torvalds goto out; 16671da177e4SLinus Torvalds 16683dcd25f3SJan Blunck error = do_proc_readlink(&path, buffer, buflen); 16693dcd25f3SJan Blunck path_put(&path); 16701da177e4SLinus Torvalds out: 16711da177e4SLinus Torvalds return error; 16721da177e4SLinus Torvalds } 16731da177e4SLinus Torvalds 1674faf60af1SCyrill Gorcunov const struct inode_operations proc_pid_link_inode_operations = { 16751da177e4SLinus Torvalds .readlink = proc_pid_readlink, 16766b255391SAl Viro .get_link = proc_pid_get_link, 16776d76fa58SLinus Torvalds .setattr = proc_setattr, 16781da177e4SLinus Torvalds }; 16791da177e4SLinus Torvalds 168028a6d671SEric W. Biederman 168128a6d671SEric W. Biederman /* building an inode */ 168228a6d671SEric W. Biederman 1683c6eb50d2SAl Viro void task_dump_owner(struct task_struct *task, umode_t mode, 168468eb94f1SEric W. Biederman kuid_t *ruid, kgid_t *rgid) 168568eb94f1SEric W. Biederman { 168668eb94f1SEric W. Biederman /* Depending on the state of dumpable compute who should own a 168768eb94f1SEric W. Biederman * proc file for a task. 168868eb94f1SEric W. Biederman */ 168968eb94f1SEric W. Biederman const struct cred *cred; 169068eb94f1SEric W. Biederman kuid_t uid; 169168eb94f1SEric W. Biederman kgid_t gid; 169268eb94f1SEric W. Biederman 16932e0ad552SAlexey Dobriyan if (unlikely(task->flags & PF_KTHREAD)) { 16942e0ad552SAlexey Dobriyan *ruid = GLOBAL_ROOT_UID; 16952e0ad552SAlexey Dobriyan *rgid = GLOBAL_ROOT_GID; 16962e0ad552SAlexey Dobriyan return; 16972e0ad552SAlexey Dobriyan } 16982e0ad552SAlexey Dobriyan 169968eb94f1SEric W. Biederman /* Default to the tasks effective ownership */ 170068eb94f1SEric W. Biederman rcu_read_lock(); 170168eb94f1SEric W. Biederman cred = __task_cred(task); 170268eb94f1SEric W. Biederman uid = cred->euid; 170368eb94f1SEric W. Biederman gid = cred->egid; 170468eb94f1SEric W. Biederman rcu_read_unlock(); 170568eb94f1SEric W. Biederman 170668eb94f1SEric W. Biederman /* 170768eb94f1SEric W. Biederman * Before the /proc/pid/status file was created the only way to read 170868eb94f1SEric W. Biederman * the effective uid of a /process was to stat /proc/pid. Reading 170968eb94f1SEric W. Biederman * /proc/pid/status is slow enough that procps and other packages 171068eb94f1SEric W. Biederman * kept stating /proc/pid. To keep the rules in /proc simple I have 171168eb94f1SEric W. Biederman * made this apply to all per process world readable and executable 171268eb94f1SEric W. Biederman * directories. 171368eb94f1SEric W. Biederman */ 171468eb94f1SEric W. Biederman if (mode != (S_IFDIR|S_IRUGO|S_IXUGO)) { 171568eb94f1SEric W. Biederman struct mm_struct *mm; 171668eb94f1SEric W. Biederman task_lock(task); 171768eb94f1SEric W. Biederman mm = task->mm; 171868eb94f1SEric W. Biederman /* Make non-dumpable tasks owned by some root */ 171968eb94f1SEric W. Biederman if (mm) { 172068eb94f1SEric W. Biederman if (get_dumpable(mm) != SUID_DUMP_USER) { 172168eb94f1SEric W. Biederman struct user_namespace *user_ns = mm->user_ns; 172268eb94f1SEric W. Biederman 172368eb94f1SEric W. Biederman uid = make_kuid(user_ns, 0); 172468eb94f1SEric W. Biederman if (!uid_valid(uid)) 172568eb94f1SEric W. Biederman uid = GLOBAL_ROOT_UID; 172668eb94f1SEric W. Biederman 172768eb94f1SEric W. Biederman gid = make_kgid(user_ns, 0); 172868eb94f1SEric W. Biederman if (!gid_valid(gid)) 172968eb94f1SEric W. Biederman gid = GLOBAL_ROOT_GID; 173068eb94f1SEric W. Biederman } 173168eb94f1SEric W. Biederman } else { 173268eb94f1SEric W. Biederman uid = GLOBAL_ROOT_UID; 173368eb94f1SEric W. Biederman gid = GLOBAL_ROOT_GID; 173468eb94f1SEric W. Biederman } 173568eb94f1SEric W. Biederman task_unlock(task); 173668eb94f1SEric W. Biederman } 173768eb94f1SEric W. Biederman *ruid = uid; 173868eb94f1SEric W. Biederman *rgid = gid; 173968eb94f1SEric W. Biederman } 174068eb94f1SEric W. Biederman 1741db978da8SAndreas Gruenbacher struct inode *proc_pid_make_inode(struct super_block * sb, 1742db978da8SAndreas Gruenbacher struct task_struct *task, umode_t mode) 174328a6d671SEric W. Biederman { 174428a6d671SEric W. Biederman struct inode * inode; 174528a6d671SEric W. Biederman struct proc_inode *ei; 174628a6d671SEric W. Biederman 174728a6d671SEric W. Biederman /* We need a new inode */ 174828a6d671SEric W. Biederman 174928a6d671SEric W. Biederman inode = new_inode(sb); 175028a6d671SEric W. Biederman if (!inode) 175128a6d671SEric W. Biederman goto out; 175228a6d671SEric W. Biederman 175328a6d671SEric W. Biederman /* Common stuff */ 175428a6d671SEric W. Biederman ei = PROC_I(inode); 1755db978da8SAndreas Gruenbacher inode->i_mode = mode; 175685fe4025SChristoph Hellwig inode->i_ino = get_next_ino(); 1757078cd827SDeepa Dinamani inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode); 175828a6d671SEric W. Biederman inode->i_op = &proc_def_inode_operations; 175928a6d671SEric W. Biederman 176028a6d671SEric W. Biederman /* 176128a6d671SEric W. Biederman * grab the reference to task. 176228a6d671SEric W. Biederman */ 17631a657f78SOleg Nesterov ei->pid = get_task_pid(task, PIDTYPE_PID); 176428a6d671SEric W. Biederman if (!ei->pid) 176528a6d671SEric W. Biederman goto out_unlock; 176628a6d671SEric W. Biederman 176768eb94f1SEric W. Biederman task_dump_owner(task, 0, &inode->i_uid, &inode->i_gid); 176828a6d671SEric W. Biederman security_task_to_inode(task, inode); 176928a6d671SEric W. Biederman 177028a6d671SEric W. Biederman out: 177128a6d671SEric W. Biederman return inode; 177228a6d671SEric W. Biederman 177328a6d671SEric W. Biederman out_unlock: 177428a6d671SEric W. Biederman iput(inode); 177528a6d671SEric W. Biederman return NULL; 177628a6d671SEric W. Biederman } 177728a6d671SEric W. Biederman 1778a528d35eSDavid Howells int pid_getattr(const struct path *path, struct kstat *stat, 1779a528d35eSDavid Howells u32 request_mask, unsigned int query_flags) 178028a6d671SEric W. Biederman { 1781a528d35eSDavid Howells struct inode *inode = d_inode(path->dentry); 178276f668beSChristoph Hellwig struct pid_namespace *pid = proc_pid_ns(inode); 178328a6d671SEric W. Biederman struct task_struct *task; 1784c69e8d9cSDavid Howells 178528a6d671SEric W. Biederman generic_fillattr(inode, stat); 178628a6d671SEric W. Biederman 178728a6d671SEric W. Biederman rcu_read_lock(); 1788dcb0f222SEric W. Biederman stat->uid = GLOBAL_ROOT_UID; 1789dcb0f222SEric W. Biederman stat->gid = GLOBAL_ROOT_GID; 179028a6d671SEric W. Biederman task = pid_task(proc_pid(inode), PIDTYPE_PID); 179128a6d671SEric W. Biederman if (task) { 1792796f571bSLafcadio Wluiki if (!has_pid_permissions(pid, task, HIDEPID_INVISIBLE)) { 17930499680aSVasiliy Kulikov rcu_read_unlock(); 17940499680aSVasiliy Kulikov /* 17950499680aSVasiliy Kulikov * This doesn't prevent learning whether PID exists, 17960499680aSVasiliy Kulikov * it only makes getattr() consistent with readdir(). 17970499680aSVasiliy Kulikov */ 17980499680aSVasiliy Kulikov return -ENOENT; 17990499680aSVasiliy Kulikov } 180068eb94f1SEric W. Biederman task_dump_owner(task, inode->i_mode, &stat->uid, &stat->gid); 180128a6d671SEric W. Biederman } 180228a6d671SEric W. Biederman rcu_read_unlock(); 180328a6d671SEric W. Biederman return 0; 180428a6d671SEric W. Biederman } 180528a6d671SEric W. Biederman 180628a6d671SEric W. Biederman /* dentry stuff */ 180728a6d671SEric W. Biederman 180828a6d671SEric W. Biederman /* 18091bbc5513SAl Viro * Set <pid>/... inode ownership (can change due to setuid(), etc.) 18101bbc5513SAl Viro */ 18111bbc5513SAl Viro void pid_update_inode(struct task_struct *task, struct inode *inode) 18121bbc5513SAl Viro { 18131bbc5513SAl Viro task_dump_owner(task, inode->i_mode, &inode->i_uid, &inode->i_gid); 18141bbc5513SAl Viro 18151bbc5513SAl Viro inode->i_mode &= ~(S_ISUID | S_ISGID); 18161bbc5513SAl Viro security_task_to_inode(task, inode); 18171bbc5513SAl Viro } 18181bbc5513SAl Viro 18191bbc5513SAl Viro /* 182028a6d671SEric W. Biederman * Rewrite the inode's ownerships here because the owning task may have 182128a6d671SEric W. Biederman * performed a setuid(), etc. 182228a6d671SEric W. Biederman * 182328a6d671SEric W. Biederman */ 18241bbc5513SAl Viro static int pid_revalidate(struct dentry *dentry, unsigned int flags) 182528a6d671SEric W. Biederman { 182634286d66SNick Piggin struct inode *inode; 182734286d66SNick Piggin struct task_struct *task; 1828c69e8d9cSDavid Howells 18290b728e19SAl Viro if (flags & LOOKUP_RCU) 183034286d66SNick Piggin return -ECHILD; 183134286d66SNick Piggin 18322b0143b5SDavid Howells inode = d_inode(dentry); 183334286d66SNick Piggin task = get_proc_task(inode); 183434286d66SNick Piggin 183528a6d671SEric W. Biederman if (task) { 18361bbc5513SAl Viro pid_update_inode(task, inode); 183728a6d671SEric W. Biederman put_task_struct(task); 183828a6d671SEric W. Biederman return 1; 183928a6d671SEric W. Biederman } 184028a6d671SEric W. Biederman return 0; 184128a6d671SEric W. Biederman } 184228a6d671SEric W. Biederman 1843d855a4b7SOleg Nesterov static inline bool proc_inode_is_dead(struct inode *inode) 1844d855a4b7SOleg Nesterov { 1845d855a4b7SOleg Nesterov return !proc_pid(inode)->tasks[PIDTYPE_PID].first; 1846d855a4b7SOleg Nesterov } 1847d855a4b7SOleg Nesterov 18481dd704b6SDavid Howells int pid_delete_dentry(const struct dentry *dentry) 18491dd704b6SDavid Howells { 18501dd704b6SDavid Howells /* Is the task we represent dead? 18511dd704b6SDavid Howells * If so, then don't put the dentry on the lru list, 18521dd704b6SDavid Howells * kill it immediately. 18531dd704b6SDavid Howells */ 18542b0143b5SDavid Howells return proc_inode_is_dead(d_inode(dentry)); 18551dd704b6SDavid Howells } 18561dd704b6SDavid Howells 18576b4e306aSEric W. Biederman const struct dentry_operations pid_dentry_operations = 185828a6d671SEric W. Biederman { 185928a6d671SEric W. Biederman .d_revalidate = pid_revalidate, 186028a6d671SEric W. Biederman .d_delete = pid_delete_dentry, 186128a6d671SEric W. Biederman }; 186228a6d671SEric W. Biederman 186328a6d671SEric W. Biederman /* Lookups */ 186428a6d671SEric W. Biederman 18651c0d04c9SEric W. Biederman /* 18661c0d04c9SEric W. Biederman * Fill a directory entry. 18671c0d04c9SEric W. Biederman * 18681c0d04c9SEric W. Biederman * If possible create the dcache entry and derive our inode number and 18691c0d04c9SEric W. Biederman * file type from dcache entry. 18701c0d04c9SEric W. Biederman * 18711c0d04c9SEric W. Biederman * Since all of the proc inode numbers are dynamically generated, the inode 18721c0d04c9SEric W. Biederman * numbers do not exist until the inode is cache. This means creating the 18731c0d04c9SEric W. Biederman * the dcache entry in readdir is necessary to keep the inode numbers 18741c0d04c9SEric W. Biederman * reported by readdir in sync with the inode numbers reported 18751c0d04c9SEric W. Biederman * by stat. 18761c0d04c9SEric W. Biederman */ 1877f0c3b509SAl Viro bool proc_fill_cache(struct file *file, struct dir_context *ctx, 18786b4e306aSEric W. Biederman const char *name, int len, 1879c5141e6dSEric Dumazet instantiate_t instantiate, struct task_struct *task, const void *ptr) 188061a28784SEric W. Biederman { 1881f0c3b509SAl Viro struct dentry *child, *dir = file->f_path.dentry; 18821df98b8bSAl Viro struct qstr qname = QSTR_INIT(name, len); 188361a28784SEric W. Biederman struct inode *inode; 18840168b9e3SAl Viro unsigned type = DT_UNKNOWN; 18850168b9e3SAl Viro ino_t ino = 1; 188661a28784SEric W. Biederman 18871df98b8bSAl Viro child = d_hash_and_lookup(dir, &qname); 188861a28784SEric W. Biederman if (!child) { 18893781764bSAl Viro DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq); 18903781764bSAl Viro child = d_alloc_parallel(dir, &qname, &wq); 18913781764bSAl Viro if (IS_ERR(child)) 189261a28784SEric W. Biederman goto end_instantiate; 18933781764bSAl Viro if (d_in_lookup(child)) { 18940168b9e3SAl Viro struct dentry *res; 18950168b9e3SAl Viro res = instantiate(child, task, ptr); 18963781764bSAl Viro d_lookup_done(child); 18970168b9e3SAl Viro if (IS_ERR(res)) 18981df98b8bSAl Viro goto end_instantiate; 18990168b9e3SAl Viro if (unlikely(res)) { 19000168b9e3SAl Viro dput(child); 19010168b9e3SAl Viro child = res; 19021df98b8bSAl Viro } 19031df98b8bSAl Viro } 19043781764bSAl Viro } 19052b0143b5SDavid Howells inode = d_inode(child); 190661a28784SEric W. Biederman ino = inode->i_ino; 190761a28784SEric W. Biederman type = inode->i_mode >> 12; 19080168b9e3SAl Viro end_instantiate: 190961a28784SEric W. Biederman dput(child); 1910f0c3b509SAl Viro return dir_emit(ctx, name, len, ino, type); 191161a28784SEric W. Biederman } 191261a28784SEric W. Biederman 1913640708a2SPavel Emelyanov /* 1914640708a2SPavel Emelyanov * dname_to_vma_addr - maps a dentry name into two unsigned longs 1915640708a2SPavel Emelyanov * which represent vma start and end addresses. 1916640708a2SPavel Emelyanov */ 1917640708a2SPavel Emelyanov static int dname_to_vma_addr(struct dentry *dentry, 1918640708a2SPavel Emelyanov unsigned long *start, unsigned long *end) 1919640708a2SPavel Emelyanov { 1920ac7f1061SAlexey Dobriyan const char *str = dentry->d_name.name; 1921ac7f1061SAlexey Dobriyan unsigned long long sval, eval; 1922ac7f1061SAlexey Dobriyan unsigned int len; 1923ac7f1061SAlexey Dobriyan 192435318db5SAlexey Dobriyan if (str[0] == '0' && str[1] != '-') 192535318db5SAlexey Dobriyan return -EINVAL; 1926ac7f1061SAlexey Dobriyan len = _parse_integer(str, 16, &sval); 1927ac7f1061SAlexey Dobriyan if (len & KSTRTOX_OVERFLOW) 1928640708a2SPavel Emelyanov return -EINVAL; 1929ac7f1061SAlexey Dobriyan if (sval != (unsigned long)sval) 1930ac7f1061SAlexey Dobriyan return -EINVAL; 1931ac7f1061SAlexey Dobriyan str += len; 1932ac7f1061SAlexey Dobriyan 1933ac7f1061SAlexey Dobriyan if (*str != '-') 1934ac7f1061SAlexey Dobriyan return -EINVAL; 1935ac7f1061SAlexey Dobriyan str++; 1936ac7f1061SAlexey Dobriyan 193735318db5SAlexey Dobriyan if (str[0] == '0' && str[1]) 193835318db5SAlexey Dobriyan return -EINVAL; 1939ac7f1061SAlexey Dobriyan len = _parse_integer(str, 16, &eval); 1940ac7f1061SAlexey Dobriyan if (len & KSTRTOX_OVERFLOW) 1941ac7f1061SAlexey Dobriyan return -EINVAL; 1942ac7f1061SAlexey Dobriyan if (eval != (unsigned long)eval) 1943ac7f1061SAlexey Dobriyan return -EINVAL; 1944ac7f1061SAlexey Dobriyan str += len; 1945ac7f1061SAlexey Dobriyan 1946ac7f1061SAlexey Dobriyan if (*str != '\0') 1947ac7f1061SAlexey Dobriyan return -EINVAL; 1948ac7f1061SAlexey Dobriyan 1949ac7f1061SAlexey Dobriyan *start = sval; 1950ac7f1061SAlexey Dobriyan *end = eval; 1951640708a2SPavel Emelyanov 1952640708a2SPavel Emelyanov return 0; 1953640708a2SPavel Emelyanov } 1954640708a2SPavel Emelyanov 19550b728e19SAl Viro static int map_files_d_revalidate(struct dentry *dentry, unsigned int flags) 1956640708a2SPavel Emelyanov { 1957640708a2SPavel Emelyanov unsigned long vm_start, vm_end; 1958640708a2SPavel Emelyanov bool exact_vma_exists = false; 1959640708a2SPavel Emelyanov struct mm_struct *mm = NULL; 1960640708a2SPavel Emelyanov struct task_struct *task; 1961640708a2SPavel Emelyanov struct inode *inode; 1962640708a2SPavel Emelyanov int status = 0; 1963640708a2SPavel Emelyanov 19640b728e19SAl Viro if (flags & LOOKUP_RCU) 1965640708a2SPavel Emelyanov return -ECHILD; 1966640708a2SPavel Emelyanov 19672b0143b5SDavid Howells inode = d_inode(dentry); 1968640708a2SPavel Emelyanov task = get_proc_task(inode); 1969640708a2SPavel Emelyanov if (!task) 1970640708a2SPavel Emelyanov goto out_notask; 1971640708a2SPavel Emelyanov 1972caaee623SJann Horn mm = mm_access(task, PTRACE_MODE_READ_FSCREDS); 19732344bec7SCong Wang if (IS_ERR_OR_NULL(mm)) 1974640708a2SPavel Emelyanov goto out; 1975640708a2SPavel Emelyanov 1976640708a2SPavel Emelyanov if (!dname_to_vma_addr(dentry, &vm_start, &vm_end)) { 1977640708a2SPavel Emelyanov down_read(&mm->mmap_sem); 1978640708a2SPavel Emelyanov exact_vma_exists = !!find_exact_vma(mm, vm_start, vm_end); 1979640708a2SPavel Emelyanov up_read(&mm->mmap_sem); 1980640708a2SPavel Emelyanov } 1981640708a2SPavel Emelyanov 1982640708a2SPavel Emelyanov mmput(mm); 1983640708a2SPavel Emelyanov 1984640708a2SPavel Emelyanov if (exact_vma_exists) { 198568eb94f1SEric W. Biederman task_dump_owner(task, 0, &inode->i_uid, &inode->i_gid); 198668eb94f1SEric W. Biederman 1987640708a2SPavel Emelyanov security_task_to_inode(task, inode); 1988640708a2SPavel Emelyanov status = 1; 1989640708a2SPavel Emelyanov } 1990640708a2SPavel Emelyanov 1991640708a2SPavel Emelyanov out: 1992640708a2SPavel Emelyanov put_task_struct(task); 1993640708a2SPavel Emelyanov 1994640708a2SPavel Emelyanov out_notask: 1995640708a2SPavel Emelyanov return status; 1996640708a2SPavel Emelyanov } 1997640708a2SPavel Emelyanov 1998640708a2SPavel Emelyanov static const struct dentry_operations tid_map_files_dentry_operations = { 1999640708a2SPavel Emelyanov .d_revalidate = map_files_d_revalidate, 2000640708a2SPavel Emelyanov .d_delete = pid_delete_dentry, 2001640708a2SPavel Emelyanov }; 2002640708a2SPavel Emelyanov 20036b255391SAl Viro static int map_files_get_link(struct dentry *dentry, struct path *path) 2004640708a2SPavel Emelyanov { 2005640708a2SPavel Emelyanov unsigned long vm_start, vm_end; 2006640708a2SPavel Emelyanov struct vm_area_struct *vma; 2007640708a2SPavel Emelyanov struct task_struct *task; 2008640708a2SPavel Emelyanov struct mm_struct *mm; 2009640708a2SPavel Emelyanov int rc; 2010640708a2SPavel Emelyanov 2011640708a2SPavel Emelyanov rc = -ENOENT; 20122b0143b5SDavid Howells task = get_proc_task(d_inode(dentry)); 2013640708a2SPavel Emelyanov if (!task) 2014640708a2SPavel Emelyanov goto out; 2015640708a2SPavel Emelyanov 2016640708a2SPavel Emelyanov mm = get_task_mm(task); 2017640708a2SPavel Emelyanov put_task_struct(task); 2018640708a2SPavel Emelyanov if (!mm) 2019640708a2SPavel Emelyanov goto out; 2020640708a2SPavel Emelyanov 2021640708a2SPavel Emelyanov rc = dname_to_vma_addr(dentry, &vm_start, &vm_end); 2022640708a2SPavel Emelyanov if (rc) 2023640708a2SPavel Emelyanov goto out_mmput; 2024640708a2SPavel Emelyanov 202570335abbSArtem Fetishev rc = -ENOENT; 2026640708a2SPavel Emelyanov down_read(&mm->mmap_sem); 2027640708a2SPavel Emelyanov vma = find_exact_vma(mm, vm_start, vm_end); 2028640708a2SPavel Emelyanov if (vma && vma->vm_file) { 2029640708a2SPavel Emelyanov *path = vma->vm_file->f_path; 2030640708a2SPavel Emelyanov path_get(path); 2031640708a2SPavel Emelyanov rc = 0; 2032640708a2SPavel Emelyanov } 2033640708a2SPavel Emelyanov up_read(&mm->mmap_sem); 2034640708a2SPavel Emelyanov 2035640708a2SPavel Emelyanov out_mmput: 2036640708a2SPavel Emelyanov mmput(mm); 2037640708a2SPavel Emelyanov out: 2038640708a2SPavel Emelyanov return rc; 2039640708a2SPavel Emelyanov } 2040640708a2SPavel Emelyanov 2041640708a2SPavel Emelyanov struct map_files_info { 204220d28cdeSAlexey Dobriyan unsigned long start; 204320d28cdeSAlexey Dobriyan unsigned long end; 20447b540d06SAl Viro fmode_t mode; 2045640708a2SPavel Emelyanov }; 2046640708a2SPavel Emelyanov 2047bdb4d100SCalvin Owens /* 2048bdb4d100SCalvin Owens * Only allow CAP_SYS_ADMIN to follow the links, due to concerns about how the 2049bdb4d100SCalvin Owens * symlinks may be used to bypass permissions on ancestor directories in the 2050bdb4d100SCalvin Owens * path to the file in question. 2051bdb4d100SCalvin Owens */ 2052bdb4d100SCalvin Owens static const char * 20536b255391SAl Viro proc_map_files_get_link(struct dentry *dentry, 2054fceef393SAl Viro struct inode *inode, 2055fceef393SAl Viro struct delayed_call *done) 2056bdb4d100SCalvin Owens { 2057bdb4d100SCalvin Owens if (!capable(CAP_SYS_ADMIN)) 2058bdb4d100SCalvin Owens return ERR_PTR(-EPERM); 2059bdb4d100SCalvin Owens 2060fceef393SAl Viro return proc_pid_get_link(dentry, inode, done); 2061bdb4d100SCalvin Owens } 2062bdb4d100SCalvin Owens 2063bdb4d100SCalvin Owens /* 20646b255391SAl Viro * Identical to proc_pid_link_inode_operations except for get_link() 2065bdb4d100SCalvin Owens */ 2066bdb4d100SCalvin Owens static const struct inode_operations proc_map_files_link_inode_operations = { 2067bdb4d100SCalvin Owens .readlink = proc_pid_readlink, 20686b255391SAl Viro .get_link = proc_map_files_get_link, 2069bdb4d100SCalvin Owens .setattr = proc_setattr, 2070bdb4d100SCalvin Owens }; 2071bdb4d100SCalvin Owens 20720168b9e3SAl Viro static struct dentry * 20730168b9e3SAl Viro proc_map_files_instantiate(struct dentry *dentry, 2074640708a2SPavel Emelyanov struct task_struct *task, const void *ptr) 2075640708a2SPavel Emelyanov { 20767b540d06SAl Viro fmode_t mode = (fmode_t)(unsigned long)ptr; 2077640708a2SPavel Emelyanov struct proc_inode *ei; 2078640708a2SPavel Emelyanov struct inode *inode; 2079640708a2SPavel Emelyanov 20800168b9e3SAl Viro inode = proc_pid_make_inode(dentry->d_sb, task, S_IFLNK | 2081db978da8SAndreas Gruenbacher ((mode & FMODE_READ ) ? S_IRUSR : 0) | 2082db978da8SAndreas Gruenbacher ((mode & FMODE_WRITE) ? S_IWUSR : 0)); 2083640708a2SPavel Emelyanov if (!inode) 20840168b9e3SAl Viro return ERR_PTR(-ENOENT); 2085640708a2SPavel Emelyanov 2086640708a2SPavel Emelyanov ei = PROC_I(inode); 20876b255391SAl Viro ei->op.proc_get_link = map_files_get_link; 2088640708a2SPavel Emelyanov 2089bdb4d100SCalvin Owens inode->i_op = &proc_map_files_link_inode_operations; 2090640708a2SPavel Emelyanov inode->i_size = 64; 2091640708a2SPavel Emelyanov 2092640708a2SPavel Emelyanov d_set_d_op(dentry, &tid_map_files_dentry_operations); 20930168b9e3SAl Viro return d_splice_alias(inode, dentry); 2094640708a2SPavel Emelyanov } 2095640708a2SPavel Emelyanov 2096640708a2SPavel Emelyanov static struct dentry *proc_map_files_lookup(struct inode *dir, 209700cd8dd3SAl Viro struct dentry *dentry, unsigned int flags) 2098640708a2SPavel Emelyanov { 2099640708a2SPavel Emelyanov unsigned long vm_start, vm_end; 2100640708a2SPavel Emelyanov struct vm_area_struct *vma; 2101640708a2SPavel Emelyanov struct task_struct *task; 21020168b9e3SAl Viro struct dentry *result; 2103640708a2SPavel Emelyanov struct mm_struct *mm; 2104640708a2SPavel Emelyanov 21050168b9e3SAl Viro result = ERR_PTR(-ENOENT); 2106640708a2SPavel Emelyanov task = get_proc_task(dir); 2107640708a2SPavel Emelyanov if (!task) 2108640708a2SPavel Emelyanov goto out; 2109640708a2SPavel Emelyanov 21100168b9e3SAl Viro result = ERR_PTR(-EACCES); 2111caaee623SJann Horn if (!ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS)) 2112640708a2SPavel Emelyanov goto out_put_task; 2113640708a2SPavel Emelyanov 21140168b9e3SAl Viro result = ERR_PTR(-ENOENT); 2115640708a2SPavel Emelyanov if (dname_to_vma_addr(dentry, &vm_start, &vm_end)) 2116eb94cd96SCyrill Gorcunov goto out_put_task; 2117640708a2SPavel Emelyanov 2118640708a2SPavel Emelyanov mm = get_task_mm(task); 2119640708a2SPavel Emelyanov if (!mm) 2120eb94cd96SCyrill Gorcunov goto out_put_task; 2121640708a2SPavel Emelyanov 2122640708a2SPavel Emelyanov down_read(&mm->mmap_sem); 2123640708a2SPavel Emelyanov vma = find_exact_vma(mm, vm_start, vm_end); 2124640708a2SPavel Emelyanov if (!vma) 2125640708a2SPavel Emelyanov goto out_no_vma; 2126640708a2SPavel Emelyanov 212705f56484SStanislav Kinsbursky if (vma->vm_file) 21280168b9e3SAl Viro result = proc_map_files_instantiate(dentry, task, 21297b540d06SAl Viro (void *)(unsigned long)vma->vm_file->f_mode); 2130640708a2SPavel Emelyanov 2131640708a2SPavel Emelyanov out_no_vma: 2132640708a2SPavel Emelyanov up_read(&mm->mmap_sem); 2133640708a2SPavel Emelyanov mmput(mm); 2134640708a2SPavel Emelyanov out_put_task: 2135640708a2SPavel Emelyanov put_task_struct(task); 2136640708a2SPavel Emelyanov out: 21370168b9e3SAl Viro return result; 2138640708a2SPavel Emelyanov } 2139640708a2SPavel Emelyanov 2140640708a2SPavel Emelyanov static const struct inode_operations proc_map_files_inode_operations = { 2141640708a2SPavel Emelyanov .lookup = proc_map_files_lookup, 2142640708a2SPavel Emelyanov .permission = proc_fd_permission, 2143640708a2SPavel Emelyanov .setattr = proc_setattr, 2144640708a2SPavel Emelyanov }; 2145640708a2SPavel Emelyanov 2146640708a2SPavel Emelyanov static int 2147f0c3b509SAl Viro proc_map_files_readdir(struct file *file, struct dir_context *ctx) 2148640708a2SPavel Emelyanov { 2149640708a2SPavel Emelyanov struct vm_area_struct *vma; 2150640708a2SPavel Emelyanov struct task_struct *task; 2151640708a2SPavel Emelyanov struct mm_struct *mm; 2152f0c3b509SAl Viro unsigned long nr_files, pos, i; 2153f0c3b509SAl Viro struct flex_array *fa = NULL; 2154f0c3b509SAl Viro struct map_files_info info; 2155f0c3b509SAl Viro struct map_files_info *p; 2156640708a2SPavel Emelyanov int ret; 2157640708a2SPavel Emelyanov 2158640708a2SPavel Emelyanov ret = -ENOENT; 2159f0c3b509SAl Viro task = get_proc_task(file_inode(file)); 2160640708a2SPavel Emelyanov if (!task) 2161640708a2SPavel Emelyanov goto out; 2162640708a2SPavel Emelyanov 2163640708a2SPavel Emelyanov ret = -EACCES; 2164caaee623SJann Horn if (!ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS)) 2165640708a2SPavel Emelyanov goto out_put_task; 2166640708a2SPavel Emelyanov 2167640708a2SPavel Emelyanov ret = 0; 2168f0c3b509SAl Viro if (!dir_emit_dots(file, ctx)) 2169eb94cd96SCyrill Gorcunov goto out_put_task; 2170640708a2SPavel Emelyanov 2171640708a2SPavel Emelyanov mm = get_task_mm(task); 2172640708a2SPavel Emelyanov if (!mm) 2173eb94cd96SCyrill Gorcunov goto out_put_task; 2174640708a2SPavel Emelyanov down_read(&mm->mmap_sem); 2175640708a2SPavel Emelyanov 2176640708a2SPavel Emelyanov nr_files = 0; 2177640708a2SPavel Emelyanov 2178640708a2SPavel Emelyanov /* 2179640708a2SPavel Emelyanov * We need two passes here: 2180640708a2SPavel Emelyanov * 2181640708a2SPavel Emelyanov * 1) Collect vmas of mapped files with mmap_sem taken 2182640708a2SPavel Emelyanov * 2) Release mmap_sem and instantiate entries 2183640708a2SPavel Emelyanov * 2184640708a2SPavel Emelyanov * otherwise we get lockdep complained, since filldir() 2185640708a2SPavel Emelyanov * routine might require mmap_sem taken in might_fault(). 2186640708a2SPavel Emelyanov */ 2187640708a2SPavel Emelyanov 2188640708a2SPavel Emelyanov for (vma = mm->mmap, pos = 2; vma; vma = vma->vm_next) { 2189f0c3b509SAl Viro if (vma->vm_file && ++pos > ctx->pos) 2190640708a2SPavel Emelyanov nr_files++; 2191640708a2SPavel Emelyanov } 2192640708a2SPavel Emelyanov 2193640708a2SPavel Emelyanov if (nr_files) { 2194640708a2SPavel Emelyanov fa = flex_array_alloc(sizeof(info), nr_files, 2195640708a2SPavel Emelyanov GFP_KERNEL); 2196640708a2SPavel Emelyanov if (!fa || flex_array_prealloc(fa, 0, nr_files, 2197640708a2SPavel Emelyanov GFP_KERNEL)) { 2198640708a2SPavel Emelyanov ret = -ENOMEM; 2199640708a2SPavel Emelyanov if (fa) 2200640708a2SPavel Emelyanov flex_array_free(fa); 2201640708a2SPavel Emelyanov up_read(&mm->mmap_sem); 2202640708a2SPavel Emelyanov mmput(mm); 2203eb94cd96SCyrill Gorcunov goto out_put_task; 2204640708a2SPavel Emelyanov } 2205640708a2SPavel Emelyanov for (i = 0, vma = mm->mmap, pos = 2; vma; 2206640708a2SPavel Emelyanov vma = vma->vm_next) { 2207640708a2SPavel Emelyanov if (!vma->vm_file) 2208640708a2SPavel Emelyanov continue; 2209f0c3b509SAl Viro if (++pos <= ctx->pos) 2210640708a2SPavel Emelyanov continue; 2211640708a2SPavel Emelyanov 221220d28cdeSAlexey Dobriyan info.start = vma->vm_start; 221320d28cdeSAlexey Dobriyan info.end = vma->vm_end; 22147b540d06SAl Viro info.mode = vma->vm_file->f_mode; 2215640708a2SPavel Emelyanov if (flex_array_put(fa, i++, &info, GFP_KERNEL)) 2216640708a2SPavel Emelyanov BUG(); 2217640708a2SPavel Emelyanov } 2218640708a2SPavel Emelyanov } 2219640708a2SPavel Emelyanov up_read(&mm->mmap_sem); 2220fe079a5eSAlexey Dobriyan mmput(mm); 2221640708a2SPavel Emelyanov 2222640708a2SPavel Emelyanov for (i = 0; i < nr_files; i++) { 222320d28cdeSAlexey Dobriyan char buf[4 * sizeof(long) + 2]; /* max: %lx-%lx\0 */ 222420d28cdeSAlexey Dobriyan unsigned int len; 222520d28cdeSAlexey Dobriyan 2226640708a2SPavel Emelyanov p = flex_array_get(fa, i); 222720d28cdeSAlexey Dobriyan len = snprintf(buf, sizeof(buf), "%lx-%lx", p->start, p->end); 2228f0c3b509SAl Viro if (!proc_fill_cache(file, ctx, 222920d28cdeSAlexey Dobriyan buf, len, 2230640708a2SPavel Emelyanov proc_map_files_instantiate, 22317b540d06SAl Viro task, 2232f0c3b509SAl Viro (void *)(unsigned long)p->mode)) 2233640708a2SPavel Emelyanov break; 2234f0c3b509SAl Viro ctx->pos++; 2235640708a2SPavel Emelyanov } 2236640708a2SPavel Emelyanov if (fa) 2237640708a2SPavel Emelyanov flex_array_free(fa); 2238640708a2SPavel Emelyanov 2239640708a2SPavel Emelyanov out_put_task: 2240640708a2SPavel Emelyanov put_task_struct(task); 2241640708a2SPavel Emelyanov out: 2242640708a2SPavel Emelyanov return ret; 2243640708a2SPavel Emelyanov } 2244640708a2SPavel Emelyanov 2245640708a2SPavel Emelyanov static const struct file_operations proc_map_files_operations = { 2246640708a2SPavel Emelyanov .read = generic_read_dir, 2247f50752eaSAl Viro .iterate_shared = proc_map_files_readdir, 2248f50752eaSAl Viro .llseek = generic_file_llseek, 2249640708a2SPavel Emelyanov }; 2250640708a2SPavel Emelyanov 2251b18b6a9cSNicolas Pitre #if defined(CONFIG_CHECKPOINT_RESTORE) && defined(CONFIG_POSIX_TIMERS) 225248f6a7a5SPavel Emelyanov struct timers_private { 225348f6a7a5SPavel Emelyanov struct pid *pid; 225448f6a7a5SPavel Emelyanov struct task_struct *task; 225548f6a7a5SPavel Emelyanov struct sighand_struct *sighand; 225657b8015eSPavel Emelyanov struct pid_namespace *ns; 225748f6a7a5SPavel Emelyanov unsigned long flags; 225848f6a7a5SPavel Emelyanov }; 225948f6a7a5SPavel Emelyanov 226048f6a7a5SPavel Emelyanov static void *timers_start(struct seq_file *m, loff_t *pos) 226148f6a7a5SPavel Emelyanov { 226248f6a7a5SPavel Emelyanov struct timers_private *tp = m->private; 226348f6a7a5SPavel Emelyanov 226448f6a7a5SPavel Emelyanov tp->task = get_pid_task(tp->pid, PIDTYPE_PID); 226548f6a7a5SPavel Emelyanov if (!tp->task) 226648f6a7a5SPavel Emelyanov return ERR_PTR(-ESRCH); 226748f6a7a5SPavel Emelyanov 226848f6a7a5SPavel Emelyanov tp->sighand = lock_task_sighand(tp->task, &tp->flags); 226948f6a7a5SPavel Emelyanov if (!tp->sighand) 227048f6a7a5SPavel Emelyanov return ERR_PTR(-ESRCH); 227148f6a7a5SPavel Emelyanov 227248f6a7a5SPavel Emelyanov return seq_list_start(&tp->task->signal->posix_timers, *pos); 227348f6a7a5SPavel Emelyanov } 227448f6a7a5SPavel Emelyanov 227548f6a7a5SPavel Emelyanov static void *timers_next(struct seq_file *m, void *v, loff_t *pos) 227648f6a7a5SPavel Emelyanov { 227748f6a7a5SPavel Emelyanov struct timers_private *tp = m->private; 227848f6a7a5SPavel Emelyanov return seq_list_next(v, &tp->task->signal->posix_timers, pos); 227948f6a7a5SPavel Emelyanov } 228048f6a7a5SPavel Emelyanov 228148f6a7a5SPavel Emelyanov static void timers_stop(struct seq_file *m, void *v) 228248f6a7a5SPavel Emelyanov { 228348f6a7a5SPavel Emelyanov struct timers_private *tp = m->private; 228448f6a7a5SPavel Emelyanov 228548f6a7a5SPavel Emelyanov if (tp->sighand) { 228648f6a7a5SPavel Emelyanov unlock_task_sighand(tp->task, &tp->flags); 228748f6a7a5SPavel Emelyanov tp->sighand = NULL; 228848f6a7a5SPavel Emelyanov } 228948f6a7a5SPavel Emelyanov 229048f6a7a5SPavel Emelyanov if (tp->task) { 229148f6a7a5SPavel Emelyanov put_task_struct(tp->task); 229248f6a7a5SPavel Emelyanov tp->task = NULL; 229348f6a7a5SPavel Emelyanov } 229448f6a7a5SPavel Emelyanov } 229548f6a7a5SPavel Emelyanov 229648f6a7a5SPavel Emelyanov static int show_timer(struct seq_file *m, void *v) 229748f6a7a5SPavel Emelyanov { 229848f6a7a5SPavel Emelyanov struct k_itimer *timer; 229957b8015eSPavel Emelyanov struct timers_private *tp = m->private; 230057b8015eSPavel Emelyanov int notify; 2301cedbccabSAlexey Dobriyan static const char * const nstr[] = { 230257b8015eSPavel Emelyanov [SIGEV_SIGNAL] = "signal", 230357b8015eSPavel Emelyanov [SIGEV_NONE] = "none", 230457b8015eSPavel Emelyanov [SIGEV_THREAD] = "thread", 230557b8015eSPavel Emelyanov }; 230648f6a7a5SPavel Emelyanov 230748f6a7a5SPavel Emelyanov timer = list_entry((struct list_head *)v, struct k_itimer, list); 230857b8015eSPavel Emelyanov notify = timer->it_sigev_notify; 230957b8015eSPavel Emelyanov 231048f6a7a5SPavel Emelyanov seq_printf(m, "ID: %d\n", timer->it_id); 2311ba3edf1fSLinus Torvalds seq_printf(m, "signal: %d/%px\n", 231225ce3191SJoe Perches timer->sigq->info.si_signo, 231357b8015eSPavel Emelyanov timer->sigq->info.si_value.sival_ptr); 231457b8015eSPavel Emelyanov seq_printf(m, "notify: %s/%s.%d\n", 231557b8015eSPavel Emelyanov nstr[notify & ~SIGEV_THREAD_ID], 231657b8015eSPavel Emelyanov (notify & SIGEV_THREAD_ID) ? "tid" : "pid", 231757b8015eSPavel Emelyanov pid_nr_ns(timer->it_pid, tp->ns)); 231815ef0298SPavel Tikhomirov seq_printf(m, "ClockID: %d\n", timer->it_clock); 231948f6a7a5SPavel Emelyanov 232048f6a7a5SPavel Emelyanov return 0; 232148f6a7a5SPavel Emelyanov } 232248f6a7a5SPavel Emelyanov 232348f6a7a5SPavel Emelyanov static const struct seq_operations proc_timers_seq_ops = { 232448f6a7a5SPavel Emelyanov .start = timers_start, 232548f6a7a5SPavel Emelyanov .next = timers_next, 232648f6a7a5SPavel Emelyanov .stop = timers_stop, 232748f6a7a5SPavel Emelyanov .show = show_timer, 232848f6a7a5SPavel Emelyanov }; 232948f6a7a5SPavel Emelyanov 233048f6a7a5SPavel Emelyanov static int proc_timers_open(struct inode *inode, struct file *file) 233148f6a7a5SPavel Emelyanov { 233248f6a7a5SPavel Emelyanov struct timers_private *tp; 233348f6a7a5SPavel Emelyanov 233448f6a7a5SPavel Emelyanov tp = __seq_open_private(file, &proc_timers_seq_ops, 233548f6a7a5SPavel Emelyanov sizeof(struct timers_private)); 233648f6a7a5SPavel Emelyanov if (!tp) 233748f6a7a5SPavel Emelyanov return -ENOMEM; 233848f6a7a5SPavel Emelyanov 233948f6a7a5SPavel Emelyanov tp->pid = proc_pid(inode); 234076f668beSChristoph Hellwig tp->ns = proc_pid_ns(inode); 234148f6a7a5SPavel Emelyanov return 0; 234248f6a7a5SPavel Emelyanov } 234348f6a7a5SPavel Emelyanov 234448f6a7a5SPavel Emelyanov static const struct file_operations proc_timers_operations = { 234548f6a7a5SPavel Emelyanov .open = proc_timers_open, 234648f6a7a5SPavel Emelyanov .read = seq_read, 234748f6a7a5SPavel Emelyanov .llseek = seq_lseek, 234848f6a7a5SPavel Emelyanov .release = seq_release_private, 234948f6a7a5SPavel Emelyanov }; 2350b5946beaSEric Engestrom #endif 2351640708a2SPavel Emelyanov 23525de23d43SJohn Stultz static ssize_t timerslack_ns_write(struct file *file, const char __user *buf, 23535de23d43SJohn Stultz size_t count, loff_t *offset) 23545de23d43SJohn Stultz { 23555de23d43SJohn Stultz struct inode *inode = file_inode(file); 23565de23d43SJohn Stultz struct task_struct *p; 23575de23d43SJohn Stultz u64 slack_ns; 23585de23d43SJohn Stultz int err; 23595de23d43SJohn Stultz 23605de23d43SJohn Stultz err = kstrtoull_from_user(buf, count, 10, &slack_ns); 23615de23d43SJohn Stultz if (err < 0) 23625de23d43SJohn Stultz return err; 23635de23d43SJohn Stultz 23645de23d43SJohn Stultz p = get_proc_task(inode); 23655de23d43SJohn Stultz if (!p) 23665de23d43SJohn Stultz return -ESRCH; 23675de23d43SJohn Stultz 23684b2bd5feSJohn Stultz if (p != current) { 23697abbaf94SJohn Stultz if (!capable(CAP_SYS_NICE)) { 23707abbaf94SJohn Stultz count = -EPERM; 23717abbaf94SJohn Stultz goto out; 23727abbaf94SJohn Stultz } 23737abbaf94SJohn Stultz 2374904763e1SJohn Stultz err = security_task_setscheduler(p); 2375904763e1SJohn Stultz if (err) { 2376904763e1SJohn Stultz count = err; 2377904763e1SJohn Stultz goto out; 2378904763e1SJohn Stultz } 23794b2bd5feSJohn Stultz } 2380904763e1SJohn Stultz 23815de23d43SJohn Stultz task_lock(p); 23825de23d43SJohn Stultz if (slack_ns == 0) 23835de23d43SJohn Stultz p->timer_slack_ns = p->default_timer_slack_ns; 23845de23d43SJohn Stultz else 23855de23d43SJohn Stultz p->timer_slack_ns = slack_ns; 23865de23d43SJohn Stultz task_unlock(p); 23875de23d43SJohn Stultz 23887abbaf94SJohn Stultz out: 23895de23d43SJohn Stultz put_task_struct(p); 23905de23d43SJohn Stultz 23915de23d43SJohn Stultz return count; 23925de23d43SJohn Stultz } 23935de23d43SJohn Stultz 23945de23d43SJohn Stultz static int timerslack_ns_show(struct seq_file *m, void *v) 23955de23d43SJohn Stultz { 23965de23d43SJohn Stultz struct inode *inode = m->private; 23975de23d43SJohn Stultz struct task_struct *p; 23985de23d43SJohn Stultz int err = 0; 23995de23d43SJohn Stultz 24005de23d43SJohn Stultz p = get_proc_task(inode); 24015de23d43SJohn Stultz if (!p) 24025de23d43SJohn Stultz return -ESRCH; 24035de23d43SJohn Stultz 24044b2bd5feSJohn Stultz if (p != current) { 24054b2bd5feSJohn Stultz 24067abbaf94SJohn Stultz if (!capable(CAP_SYS_NICE)) { 24077abbaf94SJohn Stultz err = -EPERM; 24087abbaf94SJohn Stultz goto out; 24097abbaf94SJohn Stultz } 2410904763e1SJohn Stultz err = security_task_getscheduler(p); 2411904763e1SJohn Stultz if (err) 2412904763e1SJohn Stultz goto out; 24134b2bd5feSJohn Stultz } 2414904763e1SJohn Stultz 24155de23d43SJohn Stultz task_lock(p); 24165de23d43SJohn Stultz seq_printf(m, "%llu\n", p->timer_slack_ns); 24175de23d43SJohn Stultz task_unlock(p); 24185de23d43SJohn Stultz 24197abbaf94SJohn Stultz out: 24205de23d43SJohn Stultz put_task_struct(p); 24215de23d43SJohn Stultz 24225de23d43SJohn Stultz return err; 24235de23d43SJohn Stultz } 24245de23d43SJohn Stultz 24255de23d43SJohn Stultz static int timerslack_ns_open(struct inode *inode, struct file *filp) 24265de23d43SJohn Stultz { 24275de23d43SJohn Stultz return single_open(filp, timerslack_ns_show, inode); 24285de23d43SJohn Stultz } 24295de23d43SJohn Stultz 24305de23d43SJohn Stultz static const struct file_operations proc_pid_set_timerslack_ns_operations = { 24315de23d43SJohn Stultz .open = timerslack_ns_open, 24325de23d43SJohn Stultz .read = seq_read, 24335de23d43SJohn Stultz .write = timerslack_ns_write, 24345de23d43SJohn Stultz .llseek = seq_lseek, 24355de23d43SJohn Stultz .release = single_release, 24365de23d43SJohn Stultz }; 24375de23d43SJohn Stultz 24380168b9e3SAl Viro static struct dentry *proc_pident_instantiate(struct dentry *dentry, 24390168b9e3SAl Viro struct task_struct *task, const void *ptr) 2440444ceed8SEric W. Biederman { 2441c5141e6dSEric Dumazet const struct pid_entry *p = ptr; 2442444ceed8SEric W. Biederman struct inode *inode; 2443444ceed8SEric W. Biederman struct proc_inode *ei; 2444444ceed8SEric W. Biederman 24450168b9e3SAl Viro inode = proc_pid_make_inode(dentry->d_sb, task, p->mode); 2446444ceed8SEric W. Biederman if (!inode) 24470168b9e3SAl Viro return ERR_PTR(-ENOENT); 2448444ceed8SEric W. Biederman 2449444ceed8SEric W. Biederman ei = PROC_I(inode); 2450444ceed8SEric W. Biederman if (S_ISDIR(inode->i_mode)) 2451bfe86848SMiklos Szeredi set_nlink(inode, 2); /* Use getattr to fix if necessary */ 2452444ceed8SEric W. Biederman if (p->iop) 2453444ceed8SEric W. Biederman inode->i_op = p->iop; 2454444ceed8SEric W. Biederman if (p->fop) 2455444ceed8SEric W. Biederman inode->i_fop = p->fop; 2456444ceed8SEric W. Biederman ei->op = p->op; 24571bbc5513SAl Viro pid_update_inode(task, inode); 2458fb045adbSNick Piggin d_set_d_op(dentry, &pid_dentry_operations); 24590168b9e3SAl Viro return d_splice_alias(inode, dentry); 2460444ceed8SEric W. Biederman } 2461444ceed8SEric W. Biederman 24621da177e4SLinus Torvalds static struct dentry *proc_pident_lookup(struct inode *dir, 24631da177e4SLinus Torvalds struct dentry *dentry, 2464c5141e6dSEric Dumazet const struct pid_entry *ents, 24657bcd6b0eSEric W. Biederman unsigned int nents) 24661da177e4SLinus Torvalds { 246799f89551SEric W. Biederman struct task_struct *task = get_proc_task(dir); 2468c5141e6dSEric Dumazet const struct pid_entry *p, *last; 24690168b9e3SAl Viro struct dentry *res = ERR_PTR(-ENOENT); 24701da177e4SLinus Torvalds 247199f89551SEric W. Biederman if (!task) 247299f89551SEric W. Biederman goto out_no_task; 24731da177e4SLinus Torvalds 247420cdc894SEric W. Biederman /* 247520cdc894SEric W. Biederman * Yes, it does not scale. And it should not. Don't add 247620cdc894SEric W. Biederman * new entries into /proc/<tgid>/ without very good reasons. 247720cdc894SEric W. Biederman */ 2478bac5f5d5SAlexey Dobriyan last = &ents[nents]; 2479bac5f5d5SAlexey Dobriyan for (p = ents; p < last; p++) { 24801da177e4SLinus Torvalds if (p->len != dentry->d_name.len) 24811da177e4SLinus Torvalds continue; 24821da177e4SLinus Torvalds if (!memcmp(dentry->d_name.name, p->name, p->len)) 24831da177e4SLinus Torvalds break; 24841da177e4SLinus Torvalds } 2485bac5f5d5SAlexey Dobriyan if (p >= last) 24861da177e4SLinus Torvalds goto out; 24871da177e4SLinus Torvalds 24880168b9e3SAl Viro res = proc_pident_instantiate(dentry, task, p); 24891da177e4SLinus Torvalds out: 249099f89551SEric W. Biederman put_task_struct(task); 249199f89551SEric W. Biederman out_no_task: 24920168b9e3SAl Viro return res; 24931da177e4SLinus Torvalds } 24941da177e4SLinus Torvalds 2495f0c3b509SAl Viro static int proc_pident_readdir(struct file *file, struct dir_context *ctx, 2496c5141e6dSEric Dumazet const struct pid_entry *ents, unsigned int nents) 249728a6d671SEric W. Biederman { 2498f0c3b509SAl Viro struct task_struct *task = get_proc_task(file_inode(file)); 2499f0c3b509SAl Viro const struct pid_entry *p; 250028a6d671SEric W. Biederman 250128a6d671SEric W. Biederman if (!task) 2502f0c3b509SAl Viro return -ENOENT; 250328a6d671SEric W. Biederman 2504f0c3b509SAl Viro if (!dir_emit_dots(file, ctx)) 250528a6d671SEric W. Biederman goto out; 25061da177e4SLinus Torvalds 2507f0c3b509SAl Viro if (ctx->pos >= nents + 2) 2508f0c3b509SAl Viro goto out; 2509f0c3b509SAl Viro 2510bac5f5d5SAlexey Dobriyan for (p = ents + (ctx->pos - 2); p < ents + nents; p++) { 2511f0c3b509SAl Viro if (!proc_fill_cache(file, ctx, p->name, p->len, 2512f0c3b509SAl Viro proc_pident_instantiate, task, p)) 2513f0c3b509SAl Viro break; 2514f0c3b509SAl Viro ctx->pos++; 2515f0c3b509SAl Viro } 251628a6d671SEric W. Biederman out: 251761a28784SEric W. Biederman put_task_struct(task); 2518f0c3b509SAl Viro return 0; 25191da177e4SLinus Torvalds } 25201da177e4SLinus Torvalds 25211da177e4SLinus Torvalds #ifdef CONFIG_SECURITY 252228a6d671SEric W. Biederman static ssize_t proc_pid_attr_read(struct file * file, char __user * buf, 252328a6d671SEric W. Biederman size_t count, loff_t *ppos) 252428a6d671SEric W. Biederman { 2525496ad9aaSAl Viro struct inode * inode = file_inode(file); 252604ff9708SAl Viro char *p = NULL; 252728a6d671SEric W. Biederman ssize_t length; 252828a6d671SEric W. Biederman struct task_struct *task = get_proc_task(inode); 252928a6d671SEric W. Biederman 253028a6d671SEric W. Biederman if (!task) 253104ff9708SAl Viro return -ESRCH; 253228a6d671SEric W. Biederman 253328a6d671SEric W. Biederman length = security_getprocattr(task, 25342fddfeefSJosef "Jeff" Sipek (char*)file->f_path.dentry->d_name.name, 253504ff9708SAl Viro &p); 253628a6d671SEric W. Biederman put_task_struct(task); 253704ff9708SAl Viro if (length > 0) 253804ff9708SAl Viro length = simple_read_from_buffer(buf, count, ppos, p, length); 253904ff9708SAl Viro kfree(p); 254028a6d671SEric W. Biederman return length; 254128a6d671SEric W. Biederman } 254228a6d671SEric W. Biederman 254328a6d671SEric W. Biederman static ssize_t proc_pid_attr_write(struct file * file, const char __user * buf, 254428a6d671SEric W. Biederman size_t count, loff_t *ppos) 254528a6d671SEric W. Biederman { 2546496ad9aaSAl Viro struct inode * inode = file_inode(file); 2547bb646cdbSAl Viro void *page; 254828a6d671SEric W. Biederman ssize_t length; 254928a6d671SEric W. Biederman struct task_struct *task = get_proc_task(inode); 255028a6d671SEric W. Biederman 255128a6d671SEric W. Biederman length = -ESRCH; 255228a6d671SEric W. Biederman if (!task) 255328a6d671SEric W. Biederman goto out_no_task; 2554b21507e2SStephen Smalley 2555b21507e2SStephen Smalley /* A task may only write its own attributes. */ 2556b21507e2SStephen Smalley length = -EACCES; 2557b21507e2SStephen Smalley if (current != task) 2558b21507e2SStephen Smalley goto out; 2559b21507e2SStephen Smalley 256028a6d671SEric W. Biederman if (count > PAGE_SIZE) 256128a6d671SEric W. Biederman count = PAGE_SIZE; 256228a6d671SEric W. Biederman 256328a6d671SEric W. Biederman /* No partial writes. */ 256428a6d671SEric W. Biederman length = -EINVAL; 256528a6d671SEric W. Biederman if (*ppos != 0) 256628a6d671SEric W. Biederman goto out; 256728a6d671SEric W. Biederman 2568bb646cdbSAl Viro page = memdup_user(buf, count); 2569bb646cdbSAl Viro if (IS_ERR(page)) { 2570bb646cdbSAl Viro length = PTR_ERR(page); 257128a6d671SEric W. Biederman goto out; 2572bb646cdbSAl Viro } 257328a6d671SEric W. Biederman 2574107db7c7SDavid Howells /* Guard against adverse ptrace interaction */ 2575b21507e2SStephen Smalley length = mutex_lock_interruptible(¤t->signal->cred_guard_mutex); 2576107db7c7SDavid Howells if (length < 0) 2577107db7c7SDavid Howells goto out_free; 2578107db7c7SDavid Howells 2579b21507e2SStephen Smalley length = security_setprocattr(file->f_path.dentry->d_name.name, 2580bb646cdbSAl Viro page, count); 2581b21507e2SStephen Smalley mutex_unlock(¤t->signal->cred_guard_mutex); 258228a6d671SEric W. Biederman out_free: 2583bb646cdbSAl Viro kfree(page); 258428a6d671SEric W. Biederman out: 258528a6d671SEric W. Biederman put_task_struct(task); 258628a6d671SEric W. Biederman out_no_task: 258728a6d671SEric W. Biederman return length; 258828a6d671SEric W. Biederman } 258928a6d671SEric W. Biederman 259000977a59SArjan van de Ven static const struct file_operations proc_pid_attr_operations = { 259128a6d671SEric W. Biederman .read = proc_pid_attr_read, 259228a6d671SEric W. Biederman .write = proc_pid_attr_write, 259387df8424SArnd Bergmann .llseek = generic_file_llseek, 259428a6d671SEric W. Biederman }; 259528a6d671SEric W. Biederman 2596c5141e6dSEric Dumazet static const struct pid_entry attr_dir_stuff[] = { 2597631f9c18SAlexey Dobriyan REG("current", S_IRUGO|S_IWUGO, proc_pid_attr_operations), 2598631f9c18SAlexey Dobriyan REG("prev", S_IRUGO, proc_pid_attr_operations), 2599631f9c18SAlexey Dobriyan REG("exec", S_IRUGO|S_IWUGO, proc_pid_attr_operations), 2600631f9c18SAlexey Dobriyan REG("fscreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations), 2601631f9c18SAlexey Dobriyan REG("keycreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations), 2602631f9c18SAlexey Dobriyan REG("sockcreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations), 260328a6d671SEric W. Biederman }; 260428a6d671SEric W. Biederman 2605f0c3b509SAl Viro static int proc_attr_dir_readdir(struct file *file, struct dir_context *ctx) 26061da177e4SLinus Torvalds { 2607f0c3b509SAl Viro return proc_pident_readdir(file, ctx, 260872d9dcfcSEric W. Biederman attr_dir_stuff, ARRAY_SIZE(attr_dir_stuff)); 26091da177e4SLinus Torvalds } 26101da177e4SLinus Torvalds 261100977a59SArjan van de Ven static const struct file_operations proc_attr_dir_operations = { 26121da177e4SLinus Torvalds .read = generic_read_dir, 2613f50752eaSAl Viro .iterate_shared = proc_attr_dir_readdir, 2614f50752eaSAl Viro .llseek = generic_file_llseek, 26151da177e4SLinus Torvalds }; 26161da177e4SLinus Torvalds 261772d9dcfcSEric W. Biederman static struct dentry *proc_attr_dir_lookup(struct inode *dir, 261800cd8dd3SAl Viro struct dentry *dentry, unsigned int flags) 26191da177e4SLinus Torvalds { 26207bcd6b0eSEric W. Biederman return proc_pident_lookup(dir, dentry, 26217bcd6b0eSEric W. Biederman attr_dir_stuff, ARRAY_SIZE(attr_dir_stuff)); 26221da177e4SLinus Torvalds } 26231da177e4SLinus Torvalds 2624c5ef1c42SArjan van de Ven static const struct inode_operations proc_attr_dir_inode_operations = { 262572d9dcfcSEric W. Biederman .lookup = proc_attr_dir_lookup, 262699f89551SEric W. Biederman .getattr = pid_getattr, 26276d76fa58SLinus Torvalds .setattr = proc_setattr, 26281da177e4SLinus Torvalds }; 26291da177e4SLinus Torvalds 26301da177e4SLinus Torvalds #endif 26311da177e4SLinus Torvalds 2632698ba7b5SChristoph Hellwig #ifdef CONFIG_ELF_CORE 26333cb4a0bbSKawai, Hidehiro static ssize_t proc_coredump_filter_read(struct file *file, char __user *buf, 26343cb4a0bbSKawai, Hidehiro size_t count, loff_t *ppos) 26353cb4a0bbSKawai, Hidehiro { 2636496ad9aaSAl Viro struct task_struct *task = get_proc_task(file_inode(file)); 26373cb4a0bbSKawai, Hidehiro struct mm_struct *mm; 26383cb4a0bbSKawai, Hidehiro char buffer[PROC_NUMBUF]; 26393cb4a0bbSKawai, Hidehiro size_t len; 26403cb4a0bbSKawai, Hidehiro int ret; 26413cb4a0bbSKawai, Hidehiro 26423cb4a0bbSKawai, Hidehiro if (!task) 26433cb4a0bbSKawai, Hidehiro return -ESRCH; 26443cb4a0bbSKawai, Hidehiro 26453cb4a0bbSKawai, Hidehiro ret = 0; 26463cb4a0bbSKawai, Hidehiro mm = get_task_mm(task); 26473cb4a0bbSKawai, Hidehiro if (mm) { 26483cb4a0bbSKawai, Hidehiro len = snprintf(buffer, sizeof(buffer), "%08lx\n", 26493cb4a0bbSKawai, Hidehiro ((mm->flags & MMF_DUMP_FILTER_MASK) >> 26503cb4a0bbSKawai, Hidehiro MMF_DUMP_FILTER_SHIFT)); 26513cb4a0bbSKawai, Hidehiro mmput(mm); 26523cb4a0bbSKawai, Hidehiro ret = simple_read_from_buffer(buf, count, ppos, buffer, len); 26533cb4a0bbSKawai, Hidehiro } 26543cb4a0bbSKawai, Hidehiro 26553cb4a0bbSKawai, Hidehiro put_task_struct(task); 26563cb4a0bbSKawai, Hidehiro 26573cb4a0bbSKawai, Hidehiro return ret; 26583cb4a0bbSKawai, Hidehiro } 26593cb4a0bbSKawai, Hidehiro 26603cb4a0bbSKawai, Hidehiro static ssize_t proc_coredump_filter_write(struct file *file, 26613cb4a0bbSKawai, Hidehiro const char __user *buf, 26623cb4a0bbSKawai, Hidehiro size_t count, 26633cb4a0bbSKawai, Hidehiro loff_t *ppos) 26643cb4a0bbSKawai, Hidehiro { 26653cb4a0bbSKawai, Hidehiro struct task_struct *task; 26663cb4a0bbSKawai, Hidehiro struct mm_struct *mm; 26673cb4a0bbSKawai, Hidehiro unsigned int val; 26683cb4a0bbSKawai, Hidehiro int ret; 26693cb4a0bbSKawai, Hidehiro int i; 26703cb4a0bbSKawai, Hidehiro unsigned long mask; 26713cb4a0bbSKawai, Hidehiro 2672774636e1SAlexey Dobriyan ret = kstrtouint_from_user(buf, count, 0, &val); 2673774636e1SAlexey Dobriyan if (ret < 0) 2674774636e1SAlexey Dobriyan return ret; 26753cb4a0bbSKawai, Hidehiro 26763cb4a0bbSKawai, Hidehiro ret = -ESRCH; 2677496ad9aaSAl Viro task = get_proc_task(file_inode(file)); 26783cb4a0bbSKawai, Hidehiro if (!task) 26793cb4a0bbSKawai, Hidehiro goto out_no_task; 26803cb4a0bbSKawai, Hidehiro 26813cb4a0bbSKawai, Hidehiro mm = get_task_mm(task); 26823cb4a0bbSKawai, Hidehiro if (!mm) 26833cb4a0bbSKawai, Hidehiro goto out_no_mm; 268441a0c249SColin Ian King ret = 0; 26853cb4a0bbSKawai, Hidehiro 26863cb4a0bbSKawai, Hidehiro for (i = 0, mask = 1; i < MMF_DUMP_FILTER_BITS; i++, mask <<= 1) { 26873cb4a0bbSKawai, Hidehiro if (val & mask) 26883cb4a0bbSKawai, Hidehiro set_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags); 26893cb4a0bbSKawai, Hidehiro else 26903cb4a0bbSKawai, Hidehiro clear_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags); 26913cb4a0bbSKawai, Hidehiro } 26923cb4a0bbSKawai, Hidehiro 26933cb4a0bbSKawai, Hidehiro mmput(mm); 26943cb4a0bbSKawai, Hidehiro out_no_mm: 26953cb4a0bbSKawai, Hidehiro put_task_struct(task); 26963cb4a0bbSKawai, Hidehiro out_no_task: 2697774636e1SAlexey Dobriyan if (ret < 0) 26983cb4a0bbSKawai, Hidehiro return ret; 2699774636e1SAlexey Dobriyan return count; 27003cb4a0bbSKawai, Hidehiro } 27013cb4a0bbSKawai, Hidehiro 27023cb4a0bbSKawai, Hidehiro static const struct file_operations proc_coredump_filter_operations = { 27033cb4a0bbSKawai, Hidehiro .read = proc_coredump_filter_read, 27043cb4a0bbSKawai, Hidehiro .write = proc_coredump_filter_write, 270587df8424SArnd Bergmann .llseek = generic_file_llseek, 27063cb4a0bbSKawai, Hidehiro }; 27073cb4a0bbSKawai, Hidehiro #endif 27083cb4a0bbSKawai, Hidehiro 2709aba76fdbSAndrew Morton #ifdef CONFIG_TASK_IO_ACCOUNTING 271019aadc98SAlexey Dobriyan static int do_io_accounting(struct task_struct *task, struct seq_file *m, int whole) 2711aba76fdbSAndrew Morton { 2712940389b8SAndrea Righi struct task_io_accounting acct = task->ioac; 2713297c5d92SAndrea Righi unsigned long flags; 2714293eb1e7SVasiliy Kulikov int result; 2715297c5d92SAndrea Righi 2716293eb1e7SVasiliy Kulikov result = mutex_lock_killable(&task->signal->cred_guard_mutex); 2717293eb1e7SVasiliy Kulikov if (result) 2718293eb1e7SVasiliy Kulikov return result; 2719293eb1e7SVasiliy Kulikov 2720caaee623SJann Horn if (!ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS)) { 2721293eb1e7SVasiliy Kulikov result = -EACCES; 2722293eb1e7SVasiliy Kulikov goto out_unlock; 2723293eb1e7SVasiliy Kulikov } 27241d1221f3SVasiliy Kulikov 27255995477aSAndrea Righi if (whole && lock_task_sighand(task, &flags)) { 2726b2d002dbSAndrea Righi struct task_struct *t = task; 2727297c5d92SAndrea Righi 27285995477aSAndrea Righi task_io_accounting_add(&acct, &task->signal->ioac); 27295995477aSAndrea Righi while_each_thread(task, t) 27305995477aSAndrea Righi task_io_accounting_add(&acct, &t->ioac); 2731297c5d92SAndrea Righi 2732297c5d92SAndrea Righi unlock_task_sighand(task, &flags); 2733297c5d92SAndrea Righi } 273425ce3191SJoe Perches seq_printf(m, 2735aba76fdbSAndrew Morton "rchar: %llu\n" 2736aba76fdbSAndrew Morton "wchar: %llu\n" 2737aba76fdbSAndrew Morton "syscr: %llu\n" 2738aba76fdbSAndrew Morton "syscw: %llu\n" 2739aba76fdbSAndrew Morton "read_bytes: %llu\n" 2740aba76fdbSAndrew Morton "write_bytes: %llu\n" 2741aba76fdbSAndrew Morton "cancelled_write_bytes: %llu\n", 27427c44319dSAlexander Beregalov (unsigned long long)acct.rchar, 27437c44319dSAlexander Beregalov (unsigned long long)acct.wchar, 27447c44319dSAlexander Beregalov (unsigned long long)acct.syscr, 27457c44319dSAlexander Beregalov (unsigned long long)acct.syscw, 27467c44319dSAlexander Beregalov (unsigned long long)acct.read_bytes, 27477c44319dSAlexander Beregalov (unsigned long long)acct.write_bytes, 27487c44319dSAlexander Beregalov (unsigned long long)acct.cancelled_write_bytes); 274925ce3191SJoe Perches result = 0; 275025ce3191SJoe Perches 2751293eb1e7SVasiliy Kulikov out_unlock: 2752293eb1e7SVasiliy Kulikov mutex_unlock(&task->signal->cred_guard_mutex); 2753293eb1e7SVasiliy Kulikov return result; 2754aba76fdbSAndrew Morton } 2755297c5d92SAndrea Righi 275619aadc98SAlexey Dobriyan static int proc_tid_io_accounting(struct seq_file *m, struct pid_namespace *ns, 275719aadc98SAlexey Dobriyan struct pid *pid, struct task_struct *task) 2758297c5d92SAndrea Righi { 275919aadc98SAlexey Dobriyan return do_io_accounting(task, m, 0); 2760297c5d92SAndrea Righi } 2761297c5d92SAndrea Righi 276219aadc98SAlexey Dobriyan static int proc_tgid_io_accounting(struct seq_file *m, struct pid_namespace *ns, 276319aadc98SAlexey Dobriyan struct pid *pid, struct task_struct *task) 2764297c5d92SAndrea Righi { 276519aadc98SAlexey Dobriyan return do_io_accounting(task, m, 1); 2766297c5d92SAndrea Righi } 2767297c5d92SAndrea Righi #endif /* CONFIG_TASK_IO_ACCOUNTING */ 2768aba76fdbSAndrew Morton 276922d917d8SEric W. Biederman #ifdef CONFIG_USER_NS 277022d917d8SEric W. Biederman static int proc_id_map_open(struct inode *inode, struct file *file, 2771ccf94f1bSFabian Frederick const struct seq_operations *seq_ops) 277222d917d8SEric W. Biederman { 277322d917d8SEric W. Biederman struct user_namespace *ns = NULL; 277422d917d8SEric W. Biederman struct task_struct *task; 277522d917d8SEric W. Biederman struct seq_file *seq; 277622d917d8SEric W. Biederman int ret = -EINVAL; 277722d917d8SEric W. Biederman 277822d917d8SEric W. Biederman task = get_proc_task(inode); 277922d917d8SEric W. Biederman if (task) { 278022d917d8SEric W. Biederman rcu_read_lock(); 278122d917d8SEric W. Biederman ns = get_user_ns(task_cred_xxx(task, user_ns)); 278222d917d8SEric W. Biederman rcu_read_unlock(); 278322d917d8SEric W. Biederman put_task_struct(task); 278422d917d8SEric W. Biederman } 278522d917d8SEric W. Biederman if (!ns) 278622d917d8SEric W. Biederman goto err; 278722d917d8SEric W. Biederman 278822d917d8SEric W. Biederman ret = seq_open(file, seq_ops); 278922d917d8SEric W. Biederman if (ret) 279022d917d8SEric W. Biederman goto err_put_ns; 279122d917d8SEric W. Biederman 279222d917d8SEric W. Biederman seq = file->private_data; 279322d917d8SEric W. Biederman seq->private = ns; 279422d917d8SEric W. Biederman 279522d917d8SEric W. Biederman return 0; 279622d917d8SEric W. Biederman err_put_ns: 279722d917d8SEric W. Biederman put_user_ns(ns); 279822d917d8SEric W. Biederman err: 279922d917d8SEric W. Biederman return ret; 280022d917d8SEric W. Biederman } 280122d917d8SEric W. Biederman 280222d917d8SEric W. Biederman static int proc_id_map_release(struct inode *inode, struct file *file) 280322d917d8SEric W. Biederman { 280422d917d8SEric W. Biederman struct seq_file *seq = file->private_data; 280522d917d8SEric W. Biederman struct user_namespace *ns = seq->private; 280622d917d8SEric W. Biederman put_user_ns(ns); 280722d917d8SEric W. Biederman return seq_release(inode, file); 280822d917d8SEric W. Biederman } 280922d917d8SEric W. Biederman 281022d917d8SEric W. Biederman static int proc_uid_map_open(struct inode *inode, struct file *file) 281122d917d8SEric W. Biederman { 281222d917d8SEric W. Biederman return proc_id_map_open(inode, file, &proc_uid_seq_operations); 281322d917d8SEric W. Biederman } 281422d917d8SEric W. Biederman 281522d917d8SEric W. Biederman static int proc_gid_map_open(struct inode *inode, struct file *file) 281622d917d8SEric W. Biederman { 281722d917d8SEric W. Biederman return proc_id_map_open(inode, file, &proc_gid_seq_operations); 281822d917d8SEric W. Biederman } 281922d917d8SEric W. Biederman 2820f76d207aSEric W. Biederman static int proc_projid_map_open(struct inode *inode, struct file *file) 2821f76d207aSEric W. Biederman { 2822f76d207aSEric W. Biederman return proc_id_map_open(inode, file, &proc_projid_seq_operations); 2823f76d207aSEric W. Biederman } 2824f76d207aSEric W. Biederman 282522d917d8SEric W. Biederman static const struct file_operations proc_uid_map_operations = { 282622d917d8SEric W. Biederman .open = proc_uid_map_open, 282722d917d8SEric W. Biederman .write = proc_uid_map_write, 282822d917d8SEric W. Biederman .read = seq_read, 282922d917d8SEric W. Biederman .llseek = seq_lseek, 283022d917d8SEric W. Biederman .release = proc_id_map_release, 283122d917d8SEric W. Biederman }; 283222d917d8SEric W. Biederman 283322d917d8SEric W. Biederman static const struct file_operations proc_gid_map_operations = { 283422d917d8SEric W. Biederman .open = proc_gid_map_open, 283522d917d8SEric W. Biederman .write = proc_gid_map_write, 283622d917d8SEric W. Biederman .read = seq_read, 283722d917d8SEric W. Biederman .llseek = seq_lseek, 283822d917d8SEric W. Biederman .release = proc_id_map_release, 283922d917d8SEric W. Biederman }; 2840f76d207aSEric W. Biederman 2841f76d207aSEric W. Biederman static const struct file_operations proc_projid_map_operations = { 2842f76d207aSEric W. Biederman .open = proc_projid_map_open, 2843f76d207aSEric W. Biederman .write = proc_projid_map_write, 2844f76d207aSEric W. Biederman .read = seq_read, 2845f76d207aSEric W. Biederman .llseek = seq_lseek, 2846f76d207aSEric W. Biederman .release = proc_id_map_release, 2847f76d207aSEric W. Biederman }; 28489cc46516SEric W. Biederman 28499cc46516SEric W. Biederman static int proc_setgroups_open(struct inode *inode, struct file *file) 28509cc46516SEric W. Biederman { 28519cc46516SEric W. Biederman struct user_namespace *ns = NULL; 28529cc46516SEric W. Biederman struct task_struct *task; 28539cc46516SEric W. Biederman int ret; 28549cc46516SEric W. Biederman 28559cc46516SEric W. Biederman ret = -ESRCH; 28569cc46516SEric W. Biederman task = get_proc_task(inode); 28579cc46516SEric W. Biederman if (task) { 28589cc46516SEric W. Biederman rcu_read_lock(); 28599cc46516SEric W. Biederman ns = get_user_ns(task_cred_xxx(task, user_ns)); 28609cc46516SEric W. Biederman rcu_read_unlock(); 28619cc46516SEric W. Biederman put_task_struct(task); 28629cc46516SEric W. Biederman } 28639cc46516SEric W. Biederman if (!ns) 28649cc46516SEric W. Biederman goto err; 28659cc46516SEric W. Biederman 28669cc46516SEric W. Biederman if (file->f_mode & FMODE_WRITE) { 28679cc46516SEric W. Biederman ret = -EACCES; 28689cc46516SEric W. Biederman if (!ns_capable(ns, CAP_SYS_ADMIN)) 28699cc46516SEric W. Biederman goto err_put_ns; 28709cc46516SEric W. Biederman } 28719cc46516SEric W. Biederman 28729cc46516SEric W. Biederman ret = single_open(file, &proc_setgroups_show, ns); 28739cc46516SEric W. Biederman if (ret) 28749cc46516SEric W. Biederman goto err_put_ns; 28759cc46516SEric W. Biederman 28769cc46516SEric W. Biederman return 0; 28779cc46516SEric W. Biederman err_put_ns: 28789cc46516SEric W. Biederman put_user_ns(ns); 28799cc46516SEric W. Biederman err: 28809cc46516SEric W. Biederman return ret; 28819cc46516SEric W. Biederman } 28829cc46516SEric W. Biederman 28839cc46516SEric W. Biederman static int proc_setgroups_release(struct inode *inode, struct file *file) 28849cc46516SEric W. Biederman { 28859cc46516SEric W. Biederman struct seq_file *seq = file->private_data; 28869cc46516SEric W. Biederman struct user_namespace *ns = seq->private; 28879cc46516SEric W. Biederman int ret = single_release(inode, file); 28889cc46516SEric W. Biederman put_user_ns(ns); 28899cc46516SEric W. Biederman return ret; 28909cc46516SEric W. Biederman } 28919cc46516SEric W. Biederman 28929cc46516SEric W. Biederman static const struct file_operations proc_setgroups_operations = { 28939cc46516SEric W. Biederman .open = proc_setgroups_open, 28949cc46516SEric W. Biederman .write = proc_setgroups_write, 28959cc46516SEric W. Biederman .read = seq_read, 28969cc46516SEric W. Biederman .llseek = seq_lseek, 28979cc46516SEric W. Biederman .release = proc_setgroups_release, 28989cc46516SEric W. Biederman }; 289922d917d8SEric W. Biederman #endif /* CONFIG_USER_NS */ 290022d917d8SEric W. Biederman 290147830723SKees Cook static int proc_pid_personality(struct seq_file *m, struct pid_namespace *ns, 290247830723SKees Cook struct pid *pid, struct task_struct *task) 290347830723SKees Cook { 2904a9712bc1SAl Viro int err = lock_trace(task); 2905a9712bc1SAl Viro if (!err) { 290647830723SKees Cook seq_printf(m, "%08x\n", task->personality); 2907a9712bc1SAl Viro unlock_trace(task); 2908a9712bc1SAl Viro } 2909a9712bc1SAl Viro return err; 291047830723SKees Cook } 291147830723SKees Cook 29127c23b330SJosh Poimboeuf #ifdef CONFIG_LIVEPATCH 29137c23b330SJosh Poimboeuf static int proc_pid_patch_state(struct seq_file *m, struct pid_namespace *ns, 29147c23b330SJosh Poimboeuf struct pid *pid, struct task_struct *task) 29157c23b330SJosh Poimboeuf { 29167c23b330SJosh Poimboeuf seq_printf(m, "%d\n", task->patch_state); 29177c23b330SJosh Poimboeuf return 0; 29187c23b330SJosh Poimboeuf } 29197c23b330SJosh Poimboeuf #endif /* CONFIG_LIVEPATCH */ 29207c23b330SJosh Poimboeuf 2921801199ceSEric W. Biederman /* 292228a6d671SEric W. Biederman * Thread groups 292328a6d671SEric W. Biederman */ 292400977a59SArjan van de Ven static const struct file_operations proc_task_operations; 2925c5ef1c42SArjan van de Ven static const struct inode_operations proc_task_inode_operations; 292620cdc894SEric W. Biederman 2927c5141e6dSEric Dumazet static const struct pid_entry tgid_base_stuff[] = { 2928631f9c18SAlexey Dobriyan DIR("task", S_IRUGO|S_IXUGO, proc_task_inode_operations, proc_task_operations), 2929631f9c18SAlexey Dobriyan DIR("fd", S_IRUSR|S_IXUSR, proc_fd_inode_operations, proc_fd_operations), 2930640708a2SPavel Emelyanov DIR("map_files", S_IRUSR|S_IXUSR, proc_map_files_inode_operations, proc_map_files_operations), 2931631f9c18SAlexey Dobriyan DIR("fdinfo", S_IRUSR|S_IXUSR, proc_fdinfo_inode_operations, proc_fdinfo_operations), 29326b4e306aSEric W. Biederman DIR("ns", S_IRUSR|S_IXUGO, proc_ns_dir_inode_operations, proc_ns_dir_operations), 2933b2211a36SAndrew Morton #ifdef CONFIG_NET 2934631f9c18SAlexey Dobriyan DIR("net", S_IRUGO|S_IXUGO, proc_net_inode_operations, proc_net_operations), 2935b2211a36SAndrew Morton #endif 2936631f9c18SAlexey Dobriyan REG("environ", S_IRUSR, proc_environ_operations), 2937c5317167SAl Viro REG("auxv", S_IRUSR, proc_auxv_operations), 2938631f9c18SAlexey Dobriyan ONE("status", S_IRUGO, proc_pid_status), 293935a35046SDjalal Harouni ONE("personality", S_IRUSR, proc_pid_personality), 29401c963eb1SAlexey Dobriyan ONE("limits", S_IRUGO, proc_pid_limits), 294143ae34cbSIngo Molnar #ifdef CONFIG_SCHED_DEBUG 2942631f9c18SAlexey Dobriyan REG("sched", S_IRUGO|S_IWUSR, proc_pid_sched_operations), 294343ae34cbSIngo Molnar #endif 29445091faa4SMike Galbraith #ifdef CONFIG_SCHED_AUTOGROUP 29455091faa4SMike Galbraith REG("autogroup", S_IRUGO|S_IWUSR, proc_pid_sched_autogroup_operations), 29465091faa4SMike Galbraith #endif 29474614a696Sjohn stultz REG("comm", S_IRUGO|S_IWUSR, proc_pid_set_comm_operations), 2948ebcb6734SRoland McGrath #ifdef CONFIG_HAVE_ARCH_TRACEHOOK 294909d93bd6SAlexey Dobriyan ONE("syscall", S_IRUSR, proc_pid_syscall), 2950ebcb6734SRoland McGrath #endif 2951c2c0bb44SAlexey Dobriyan REG("cmdline", S_IRUGO, proc_pid_cmdline_ops), 2952631f9c18SAlexey Dobriyan ONE("stat", S_IRUGO, proc_tgid_stat), 2953631f9c18SAlexey Dobriyan ONE("statm", S_IRUGO, proc_pid_statm), 2954b7643757SSiddhesh Poyarekar REG("maps", S_IRUGO, proc_pid_maps_operations), 295528a6d671SEric W. Biederman #ifdef CONFIG_NUMA 2956b7643757SSiddhesh Poyarekar REG("numa_maps", S_IRUGO, proc_pid_numa_maps_operations), 295728a6d671SEric W. Biederman #endif 2958631f9c18SAlexey Dobriyan REG("mem", S_IRUSR|S_IWUSR, proc_mem_operations), 2959631f9c18SAlexey Dobriyan LNK("cwd", proc_cwd_link), 2960631f9c18SAlexey Dobriyan LNK("root", proc_root_link), 2961631f9c18SAlexey Dobriyan LNK("exe", proc_exe_link), 2962631f9c18SAlexey Dobriyan REG("mounts", S_IRUGO, proc_mounts_operations), 2963631f9c18SAlexey Dobriyan REG("mountinfo", S_IRUGO, proc_mountinfo_operations), 2964631f9c18SAlexey Dobriyan REG("mountstats", S_IRUSR, proc_mountstats_operations), 29651e883281SMatt Mackall #ifdef CONFIG_PROC_PAGE_MONITOR 2966631f9c18SAlexey Dobriyan REG("clear_refs", S_IWUSR, proc_clear_refs_operations), 2967b7643757SSiddhesh Poyarekar REG("smaps", S_IRUGO, proc_pid_smaps_operations), 2968493b0e9dSDaniel Colascione REG("smaps_rollup", S_IRUGO, proc_pid_smaps_rollup_operations), 296932ed74a4SDjalal Harouni REG("pagemap", S_IRUSR, proc_pagemap_operations), 297028a6d671SEric W. Biederman #endif 297128a6d671SEric W. Biederman #ifdef CONFIG_SECURITY 2972631f9c18SAlexey Dobriyan DIR("attr", S_IRUGO|S_IXUGO, proc_attr_dir_inode_operations, proc_attr_dir_operations), 297328a6d671SEric W. Biederman #endif 297428a6d671SEric W. Biederman #ifdef CONFIG_KALLSYMS 2975edfcd606SAlexey Dobriyan ONE("wchan", S_IRUGO, proc_pid_wchan), 297628a6d671SEric W. Biederman #endif 29772ec220e2SKen Chen #ifdef CONFIG_STACKTRACE 297835a35046SDjalal Harouni ONE("stack", S_IRUSR, proc_pid_stack), 297928a6d671SEric W. Biederman #endif 29805968ceceSNaveen N. Rao #ifdef CONFIG_SCHED_INFO 2981f6e826caSAlexey Dobriyan ONE("schedstat", S_IRUGO, proc_pid_schedstat), 298228a6d671SEric W. Biederman #endif 29839745512cSArjan van de Ven #ifdef CONFIG_LATENCYTOP 2984631f9c18SAlexey Dobriyan REG("latency", S_IRUGO, proc_lstats_operations), 29859745512cSArjan van de Ven #endif 29868793d854SPaul Menage #ifdef CONFIG_PROC_PID_CPUSET 298752de4779SZefan Li ONE("cpuset", S_IRUGO, proc_cpuset_show), 298828a6d671SEric W. Biederman #endif 2989a424316cSPaul Menage #ifdef CONFIG_CGROUPS 2990006f4ac4SZefan Li ONE("cgroup", S_IRUGO, proc_cgroup_show), 2991a424316cSPaul Menage #endif 29926ba51e37SAlexey Dobriyan ONE("oom_score", S_IRUGO, proc_oom_score), 2993fa0cbbf1SDavid Rientjes REG("oom_adj", S_IRUGO|S_IWUSR, proc_oom_adj_operations), 2994a63d83f4SDavid Rientjes REG("oom_score_adj", S_IRUGO|S_IWUSR, proc_oom_score_adj_operations), 299528a6d671SEric W. Biederman #ifdef CONFIG_AUDITSYSCALL 2996631f9c18SAlexey Dobriyan REG("loginuid", S_IWUSR|S_IRUGO, proc_loginuid_operations), 2997631f9c18SAlexey Dobriyan REG("sessionid", S_IRUGO, proc_sessionid_operations), 299828a6d671SEric W. Biederman #endif 2999f4f154fdSAkinobu Mita #ifdef CONFIG_FAULT_INJECTION 3000631f9c18SAlexey Dobriyan REG("make-it-fail", S_IRUGO|S_IWUSR, proc_fault_inject_operations), 3001168c42bcSAkinobu Mita REG("fail-nth", 0644, proc_fail_nth_operations), 3002f4f154fdSAkinobu Mita #endif 3003698ba7b5SChristoph Hellwig #ifdef CONFIG_ELF_CORE 3004631f9c18SAlexey Dobriyan REG("coredump_filter", S_IRUGO|S_IWUSR, proc_coredump_filter_operations), 30053cb4a0bbSKawai, Hidehiro #endif 3006aba76fdbSAndrew Morton #ifdef CONFIG_TASK_IO_ACCOUNTING 300719aadc98SAlexey Dobriyan ONE("io", S_IRUSR, proc_tgid_io_accounting), 3008aba76fdbSAndrew Morton #endif 300922d917d8SEric W. Biederman #ifdef CONFIG_USER_NS 301022d917d8SEric W. Biederman REG("uid_map", S_IRUGO|S_IWUSR, proc_uid_map_operations), 301122d917d8SEric W. Biederman REG("gid_map", S_IRUGO|S_IWUSR, proc_gid_map_operations), 3012f76d207aSEric W. Biederman REG("projid_map", S_IRUGO|S_IWUSR, proc_projid_map_operations), 30139cc46516SEric W. Biederman REG("setgroups", S_IRUGO|S_IWUSR, proc_setgroups_operations), 301422d917d8SEric W. Biederman #endif 3015b18b6a9cSNicolas Pitre #if defined(CONFIG_CHECKPOINT_RESTORE) && defined(CONFIG_POSIX_TIMERS) 301648f6a7a5SPavel Emelyanov REG("timers", S_IRUGO, proc_timers_operations), 301748f6a7a5SPavel Emelyanov #endif 30185de23d43SJohn Stultz REG("timerslack_ns", S_IRUGO|S_IWUGO, proc_pid_set_timerslack_ns_operations), 30197c23b330SJosh Poimboeuf #ifdef CONFIG_LIVEPATCH 30207c23b330SJosh Poimboeuf ONE("patch_state", S_IRUSR, proc_pid_patch_state), 30217c23b330SJosh Poimboeuf #endif 302228a6d671SEric W. Biederman }; 302328a6d671SEric W. Biederman 3024f0c3b509SAl Viro static int proc_tgid_base_readdir(struct file *file, struct dir_context *ctx) 302528a6d671SEric W. Biederman { 3026f0c3b509SAl Viro return proc_pident_readdir(file, ctx, 302728a6d671SEric W. Biederman tgid_base_stuff, ARRAY_SIZE(tgid_base_stuff)); 302828a6d671SEric W. Biederman } 302928a6d671SEric W. Biederman 303000977a59SArjan van de Ven static const struct file_operations proc_tgid_base_operations = { 303128a6d671SEric W. Biederman .read = generic_read_dir, 3032f50752eaSAl Viro .iterate_shared = proc_tgid_base_readdir, 3033f50752eaSAl Viro .llseek = generic_file_llseek, 303428a6d671SEric W. Biederman }; 303528a6d671SEric W. Biederman 303600cd8dd3SAl Viro static struct dentry *proc_tgid_base_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags) 303700cd8dd3SAl Viro { 30387bcd6b0eSEric W. Biederman return proc_pident_lookup(dir, dentry, 30397bcd6b0eSEric W. Biederman tgid_base_stuff, ARRAY_SIZE(tgid_base_stuff)); 304028a6d671SEric W. Biederman } 304128a6d671SEric W. Biederman 3042c5ef1c42SArjan van de Ven static const struct inode_operations proc_tgid_base_inode_operations = { 304328a6d671SEric W. Biederman .lookup = proc_tgid_base_lookup, 304428a6d671SEric W. Biederman .getattr = pid_getattr, 304528a6d671SEric W. Biederman .setattr = proc_setattr, 30460499680aSVasiliy Kulikov .permission = proc_pid_permission, 304728a6d671SEric W. Biederman }; 304828a6d671SEric W. Biederman 304960347f67SPavel Emelyanov static void proc_flush_task_mnt(struct vfsmount *mnt, pid_t pid, pid_t tgid) 30501da177e4SLinus Torvalds { 305148e6484dSEric W. Biederman struct dentry *dentry, *leader, *dir; 3052e3912ac3SAlexey Dobriyan char buf[10 + 1]; 305348e6484dSEric W. Biederman struct qstr name; 30541da177e4SLinus Torvalds 305548e6484dSEric W. Biederman name.name = buf; 3056e3912ac3SAlexey Dobriyan name.len = snprintf(buf, sizeof(buf), "%u", pid); 30574f522a24SAl Viro /* no ->d_hash() rejects on procfs */ 305860347f67SPavel Emelyanov dentry = d_hash_and_lookup(mnt->mnt_root, &name); 305948e6484dSEric W. Biederman if (dentry) { 3060bbd51924SEric W. Biederman d_invalidate(dentry); 306148e6484dSEric W. Biederman dput(dentry); 30621da177e4SLinus Torvalds } 30631da177e4SLinus Torvalds 3064c35a7f18SOleg Nesterov if (pid == tgid) 3065c35a7f18SOleg Nesterov return; 3066c35a7f18SOleg Nesterov 306748e6484dSEric W. Biederman name.name = buf; 3068e3912ac3SAlexey Dobriyan name.len = snprintf(buf, sizeof(buf), "%u", tgid); 306960347f67SPavel Emelyanov leader = d_hash_and_lookup(mnt->mnt_root, &name); 307048e6484dSEric W. Biederman if (!leader) 307148e6484dSEric W. Biederman goto out; 307248e6484dSEric W. Biederman 307348e6484dSEric W. Biederman name.name = "task"; 307448e6484dSEric W. Biederman name.len = strlen(name.name); 307548e6484dSEric W. Biederman dir = d_hash_and_lookup(leader, &name); 307648e6484dSEric W. Biederman if (!dir) 307748e6484dSEric W. Biederman goto out_put_leader; 307848e6484dSEric W. Biederman 307948e6484dSEric W. Biederman name.name = buf; 3080e3912ac3SAlexey Dobriyan name.len = snprintf(buf, sizeof(buf), "%u", pid); 308148e6484dSEric W. Biederman dentry = d_hash_and_lookup(dir, &name); 308248e6484dSEric W. Biederman if (dentry) { 3083bbd51924SEric W. Biederman d_invalidate(dentry); 308448e6484dSEric W. Biederman dput(dentry); 30851da177e4SLinus Torvalds } 308648e6484dSEric W. Biederman 308748e6484dSEric W. Biederman dput(dir); 308848e6484dSEric W. Biederman out_put_leader: 308948e6484dSEric W. Biederman dput(leader); 309048e6484dSEric W. Biederman out: 309148e6484dSEric W. Biederman return; 30921da177e4SLinus Torvalds } 30931da177e4SLinus Torvalds 30940895e91dSRandy Dunlap /** 30950895e91dSRandy Dunlap * proc_flush_task - Remove dcache entries for @task from the /proc dcache. 30960895e91dSRandy Dunlap * @task: task that should be flushed. 30970895e91dSRandy Dunlap * 30980895e91dSRandy Dunlap * When flushing dentries from proc, one needs to flush them from global 309960347f67SPavel Emelyanov * proc (proc_mnt) and from all the namespaces' procs this task was seen 31000895e91dSRandy Dunlap * in. This call is supposed to do all of this job. 31010895e91dSRandy Dunlap * 31020895e91dSRandy Dunlap * Looks in the dcache for 31030895e91dSRandy Dunlap * /proc/@pid 31040895e91dSRandy Dunlap * /proc/@tgid/task/@pid 31050895e91dSRandy Dunlap * if either directory is present flushes it and all of it'ts children 31060895e91dSRandy Dunlap * from the dcache. 31070895e91dSRandy Dunlap * 31080895e91dSRandy Dunlap * It is safe and reasonable to cache /proc entries for a task until 31090895e91dSRandy Dunlap * that task exits. After that they just clog up the dcache with 31100895e91dSRandy Dunlap * useless entries, possibly causing useful dcache entries to be 31110895e91dSRandy Dunlap * flushed instead. This routine is proved to flush those useless 31120895e91dSRandy Dunlap * dcache entries at process exit time. 31130895e91dSRandy Dunlap * 31140895e91dSRandy Dunlap * NOTE: This routine is just an optimization so it does not guarantee 31150895e91dSRandy Dunlap * that no dcache entries will exist at process exit time it 31160895e91dSRandy Dunlap * just makes it very unlikely that any will persist. 311760347f67SPavel Emelyanov */ 311860347f67SPavel Emelyanov 311960347f67SPavel Emelyanov void proc_flush_task(struct task_struct *task) 312060347f67SPavel Emelyanov { 31219fcc2d15SEric W. Biederman int i; 31229b4d1cbeSOleg Nesterov struct pid *pid, *tgid; 3123130f77ecSPavel Emelyanov struct upid *upid; 3124130f77ecSPavel Emelyanov 3125130f77ecSPavel Emelyanov pid = task_pid(task); 3126130f77ecSPavel Emelyanov tgid = task_tgid(task); 31279fcc2d15SEric W. Biederman 31289fcc2d15SEric W. Biederman for (i = 0; i <= pid->level; i++) { 3129130f77ecSPavel Emelyanov upid = &pid->numbers[i]; 3130130f77ecSPavel Emelyanov proc_flush_task_mnt(upid->ns->proc_mnt, upid->nr, 31319b4d1cbeSOleg Nesterov tgid->numbers[i].nr); 3132130f77ecSPavel Emelyanov } 313360347f67SPavel Emelyanov } 313460347f67SPavel Emelyanov 31350168b9e3SAl Viro static struct dentry *proc_pid_instantiate(struct dentry * dentry, 3136c5141e6dSEric Dumazet struct task_struct *task, const void *ptr) 3137444ceed8SEric W. Biederman { 3138444ceed8SEric W. Biederman struct inode *inode; 3139444ceed8SEric W. Biederman 31400168b9e3SAl Viro inode = proc_pid_make_inode(dentry->d_sb, task, S_IFDIR | S_IRUGO | S_IXUGO); 3141444ceed8SEric W. Biederman if (!inode) 31420168b9e3SAl Viro return ERR_PTR(-ENOENT); 3143444ceed8SEric W. Biederman 3144444ceed8SEric W. Biederman inode->i_op = &proc_tgid_base_inode_operations; 3145444ceed8SEric W. Biederman inode->i_fop = &proc_tgid_base_operations; 3146444ceed8SEric W. Biederman inode->i_flags|=S_IMMUTABLE; 3147aed54175SVegard Nossum 31481270dd8dSAlexey Dobriyan set_nlink(inode, nlink_tgid); 31491bbc5513SAl Viro pid_update_inode(task, inode); 3150444ceed8SEric W. Biederman 3151fb045adbSNick Piggin d_set_d_op(dentry, &pid_dentry_operations); 31520168b9e3SAl Viro return d_splice_alias(inode, dentry); 3153444ceed8SEric W. Biederman } 3154444ceed8SEric W. Biederman 315500cd8dd3SAl Viro struct dentry *proc_pid_lookup(struct inode *dir, struct dentry * dentry, unsigned int flags) 31561da177e4SLinus Torvalds { 31571da177e4SLinus Torvalds struct task_struct *task; 31581da177e4SLinus Torvalds unsigned tgid; 3159b488893aSPavel Emelyanov struct pid_namespace *ns; 31600168b9e3SAl Viro struct dentry *result = ERR_PTR(-ENOENT); 31611da177e4SLinus Torvalds 3162dbcdb504SAlexey Dobriyan tgid = name_to_int(&dentry->d_name); 31631da177e4SLinus Torvalds if (tgid == ~0U) 31641da177e4SLinus Torvalds goto out; 31651da177e4SLinus Torvalds 3166b488893aSPavel Emelyanov ns = dentry->d_sb->s_fs_info; 3167de758734SEric W. Biederman rcu_read_lock(); 3168b488893aSPavel Emelyanov task = find_task_by_pid_ns(tgid, ns); 31691da177e4SLinus Torvalds if (task) 31701da177e4SLinus Torvalds get_task_struct(task); 3171de758734SEric W. Biederman rcu_read_unlock(); 31721da177e4SLinus Torvalds if (!task) 31731da177e4SLinus Torvalds goto out; 31741da177e4SLinus Torvalds 31750168b9e3SAl Viro result = proc_pid_instantiate(dentry, task, NULL); 317648e6484dSEric W. Biederman put_task_struct(task); 31771da177e4SLinus Torvalds out: 31780168b9e3SAl Viro return result; 31791da177e4SLinus Torvalds } 31801da177e4SLinus Torvalds 31811da177e4SLinus Torvalds /* 31820804ef4bSEric W. Biederman * Find the first task with tgid >= tgid 31830bc58a91SEric W. Biederman * 31841da177e4SLinus Torvalds */ 318519fd4bb2SEric W. Biederman struct tgid_iter { 318619fd4bb2SEric W. Biederman unsigned int tgid; 31870804ef4bSEric W. Biederman struct task_struct *task; 318819fd4bb2SEric W. Biederman }; 318919fd4bb2SEric W. Biederman static struct tgid_iter next_tgid(struct pid_namespace *ns, struct tgid_iter iter) 319019fd4bb2SEric W. Biederman { 31910804ef4bSEric W. Biederman struct pid *pid; 31921da177e4SLinus Torvalds 319319fd4bb2SEric W. Biederman if (iter.task) 319419fd4bb2SEric W. Biederman put_task_struct(iter.task); 31950804ef4bSEric W. Biederman rcu_read_lock(); 31960804ef4bSEric W. Biederman retry: 319719fd4bb2SEric W. Biederman iter.task = NULL; 319819fd4bb2SEric W. Biederman pid = find_ge_pid(iter.tgid, ns); 31990804ef4bSEric W. Biederman if (pid) { 320019fd4bb2SEric W. Biederman iter.tgid = pid_nr_ns(pid, ns); 320119fd4bb2SEric W. Biederman iter.task = pid_task(pid, PIDTYPE_PID); 32020804ef4bSEric W. Biederman /* What we to know is if the pid we have find is the 32030804ef4bSEric W. Biederman * pid of a thread_group_leader. Testing for task 32040804ef4bSEric W. Biederman * being a thread_group_leader is the obvious thing 32050804ef4bSEric W. Biederman * todo but there is a window when it fails, due to 32060804ef4bSEric W. Biederman * the pid transfer logic in de_thread. 32070804ef4bSEric W. Biederman * 32080804ef4bSEric W. Biederman * So we perform the straight forward test of seeing 32090804ef4bSEric W. Biederman * if the pid we have found is the pid of a thread 32100804ef4bSEric W. Biederman * group leader, and don't worry if the task we have 32110804ef4bSEric W. Biederman * found doesn't happen to be a thread group leader. 32120804ef4bSEric W. Biederman * As we don't care in the case of readdir. 32130bc58a91SEric W. Biederman */ 321419fd4bb2SEric W. Biederman if (!iter.task || !has_group_leader_pid(iter.task)) { 321519fd4bb2SEric W. Biederman iter.tgid += 1; 32160804ef4bSEric W. Biederman goto retry; 321719fd4bb2SEric W. Biederman } 321819fd4bb2SEric W. Biederman get_task_struct(iter.task); 32191da177e4SLinus Torvalds } 3220454cc105SEric W. Biederman rcu_read_unlock(); 322119fd4bb2SEric W. Biederman return iter; 32221da177e4SLinus Torvalds } 32231da177e4SLinus Torvalds 32240097875bSEric W. Biederman #define TGID_OFFSET (FIRST_PROCESS_ENTRY + 2) 32251da177e4SLinus Torvalds 32261da177e4SLinus Torvalds /* for the /proc/ directory itself, after non-process stuff has been done */ 3227f0c3b509SAl Viro int proc_pid_readdir(struct file *file, struct dir_context *ctx) 32281da177e4SLinus Torvalds { 322919fd4bb2SEric W. Biederman struct tgid_iter iter; 323076f668beSChristoph Hellwig struct pid_namespace *ns = proc_pid_ns(file_inode(file)); 3231f0c3b509SAl Viro loff_t pos = ctx->pos; 32321da177e4SLinus Torvalds 3233021ada7dSAl Viro if (pos >= PID_MAX_LIMIT + TGID_OFFSET) 3234f0c3b509SAl Viro return 0; 32351da177e4SLinus Torvalds 32360097875bSEric W. Biederman if (pos == TGID_OFFSET - 2) { 32372b0143b5SDavid Howells struct inode *inode = d_inode(ns->proc_self); 3238db963164SAl Viro if (!dir_emit(ctx, "self", 4, inode->i_ino, DT_LNK)) 3239f0c3b509SAl Viro return 0; 32400097875bSEric W. Biederman ctx->pos = pos = pos + 1; 3241021ada7dSAl Viro } 32420097875bSEric W. Biederman if (pos == TGID_OFFSET - 1) { 32432b0143b5SDavid Howells struct inode *inode = d_inode(ns->proc_thread_self); 32440097875bSEric W. Biederman if (!dir_emit(ctx, "thread-self", 11, inode->i_ino, DT_LNK)) 32450097875bSEric W. Biederman return 0; 32460097875bSEric W. Biederman ctx->pos = pos = pos + 1; 32470097875bSEric W. Biederman } 32480097875bSEric W. Biederman iter.tgid = pos - TGID_OFFSET; 324919fd4bb2SEric W. Biederman iter.task = NULL; 325019fd4bb2SEric W. Biederman for (iter = next_tgid(ns, iter); 325119fd4bb2SEric W. Biederman iter.task; 325219fd4bb2SEric W. Biederman iter.tgid += 1, iter = next_tgid(ns, iter)) { 3253e3912ac3SAlexey Dobriyan char name[10 + 1]; 3254f0c3b509SAl Viro int len; 32553ba4bceeSEric Dumazet 32563ba4bceeSEric Dumazet cond_resched(); 3257796f571bSLafcadio Wluiki if (!has_pid_permissions(ns, iter.task, HIDEPID_INVISIBLE)) 3258f0c3b509SAl Viro continue; 32590499680aSVasiliy Kulikov 3260e3912ac3SAlexey Dobriyan len = snprintf(name, sizeof(name), "%u", iter.tgid); 3261f0c3b509SAl Viro ctx->pos = iter.tgid + TGID_OFFSET; 3262f0c3b509SAl Viro if (!proc_fill_cache(file, ctx, name, len, 3263f0c3b509SAl Viro proc_pid_instantiate, iter.task, NULL)) { 326419fd4bb2SEric W. Biederman put_task_struct(iter.task); 3265f0c3b509SAl Viro return 0; 32661da177e4SLinus Torvalds } 32671da177e4SLinus Torvalds } 3268f0c3b509SAl Viro ctx->pos = PID_MAX_LIMIT + TGID_OFFSET; 32691da177e4SLinus Torvalds return 0; 32701da177e4SLinus Torvalds } 32711da177e4SLinus Torvalds 32720bc58a91SEric W. Biederman /* 32731b3044e3SJanis Danisevskis * proc_tid_comm_permission is a special permission function exclusively 32741b3044e3SJanis Danisevskis * used for the node /proc/<pid>/task/<tid>/comm. 32751b3044e3SJanis Danisevskis * It bypasses generic permission checks in the case where a task of the same 32761b3044e3SJanis Danisevskis * task group attempts to access the node. 32771b3044e3SJanis Danisevskis * The rationale behind this is that glibc and bionic access this node for 32781b3044e3SJanis Danisevskis * cross thread naming (pthread_set/getname_np(!self)). However, if 32791b3044e3SJanis Danisevskis * PR_SET_DUMPABLE gets set to 0 this node among others becomes uid=0 gid=0, 32801b3044e3SJanis Danisevskis * which locks out the cross thread naming implementation. 32811b3044e3SJanis Danisevskis * This function makes sure that the node is always accessible for members of 32821b3044e3SJanis Danisevskis * same thread group. 32831b3044e3SJanis Danisevskis */ 32841b3044e3SJanis Danisevskis static int proc_tid_comm_permission(struct inode *inode, int mask) 32851b3044e3SJanis Danisevskis { 32861b3044e3SJanis Danisevskis bool is_same_tgroup; 32871b3044e3SJanis Danisevskis struct task_struct *task; 32881b3044e3SJanis Danisevskis 32891b3044e3SJanis Danisevskis task = get_proc_task(inode); 32901b3044e3SJanis Danisevskis if (!task) 32911b3044e3SJanis Danisevskis return -ESRCH; 32921b3044e3SJanis Danisevskis is_same_tgroup = same_thread_group(current, task); 32931b3044e3SJanis Danisevskis put_task_struct(task); 32941b3044e3SJanis Danisevskis 32951b3044e3SJanis Danisevskis if (likely(is_same_tgroup && !(mask & MAY_EXEC))) { 32961b3044e3SJanis Danisevskis /* This file (/proc/<pid>/task/<tid>/comm) can always be 32971b3044e3SJanis Danisevskis * read or written by the members of the corresponding 32981b3044e3SJanis Danisevskis * thread group. 32991b3044e3SJanis Danisevskis */ 33001b3044e3SJanis Danisevskis return 0; 33011b3044e3SJanis Danisevskis } 33021b3044e3SJanis Danisevskis 33031b3044e3SJanis Danisevskis return generic_permission(inode, mask); 33041b3044e3SJanis Danisevskis } 33051b3044e3SJanis Danisevskis 33061b3044e3SJanis Danisevskis static const struct inode_operations proc_tid_comm_inode_operations = { 33071b3044e3SJanis Danisevskis .permission = proc_tid_comm_permission, 33081b3044e3SJanis Danisevskis }; 33091b3044e3SJanis Danisevskis 33101b3044e3SJanis Danisevskis /* 331128a6d671SEric W. Biederman * Tasks 331228a6d671SEric W. Biederman */ 3313c5141e6dSEric Dumazet static const struct pid_entry tid_base_stuff[] = { 3314631f9c18SAlexey Dobriyan DIR("fd", S_IRUSR|S_IXUSR, proc_fd_inode_operations, proc_fd_operations), 33153835541dSJerome Marchand DIR("fdinfo", S_IRUSR|S_IXUSR, proc_fdinfo_inode_operations, proc_fdinfo_operations), 33166b4e306aSEric W. Biederman DIR("ns", S_IRUSR|S_IXUGO, proc_ns_dir_inode_operations, proc_ns_dir_operations), 33176ba8ed79SEric W. Biederman #ifdef CONFIG_NET 33186ba8ed79SEric W. Biederman DIR("net", S_IRUGO|S_IXUGO, proc_net_inode_operations, proc_net_operations), 33196ba8ed79SEric W. Biederman #endif 3320631f9c18SAlexey Dobriyan REG("environ", S_IRUSR, proc_environ_operations), 3321c5317167SAl Viro REG("auxv", S_IRUSR, proc_auxv_operations), 3322631f9c18SAlexey Dobriyan ONE("status", S_IRUGO, proc_pid_status), 332335a35046SDjalal Harouni ONE("personality", S_IRUSR, proc_pid_personality), 33241c963eb1SAlexey Dobriyan ONE("limits", S_IRUGO, proc_pid_limits), 332543ae34cbSIngo Molnar #ifdef CONFIG_SCHED_DEBUG 3326631f9c18SAlexey Dobriyan REG("sched", S_IRUGO|S_IWUSR, proc_pid_sched_operations), 332743ae34cbSIngo Molnar #endif 33281b3044e3SJanis Danisevskis NOD("comm", S_IFREG|S_IRUGO|S_IWUSR, 33291b3044e3SJanis Danisevskis &proc_tid_comm_inode_operations, 33301b3044e3SJanis Danisevskis &proc_pid_set_comm_operations, {}), 3331ebcb6734SRoland McGrath #ifdef CONFIG_HAVE_ARCH_TRACEHOOK 333209d93bd6SAlexey Dobriyan ONE("syscall", S_IRUSR, proc_pid_syscall), 3333ebcb6734SRoland McGrath #endif 3334c2c0bb44SAlexey Dobriyan REG("cmdline", S_IRUGO, proc_pid_cmdline_ops), 3335631f9c18SAlexey Dobriyan ONE("stat", S_IRUGO, proc_tid_stat), 3336631f9c18SAlexey Dobriyan ONE("statm", S_IRUGO, proc_pid_statm), 3337b7643757SSiddhesh Poyarekar REG("maps", S_IRUGO, proc_tid_maps_operations), 33382e13ba54SIago López Galeiras #ifdef CONFIG_PROC_CHILDREN 333981841161SCyrill Gorcunov REG("children", S_IRUGO, proc_tid_children_operations), 334081841161SCyrill Gorcunov #endif 334128a6d671SEric W. Biederman #ifdef CONFIG_NUMA 3342b7643757SSiddhesh Poyarekar REG("numa_maps", S_IRUGO, proc_tid_numa_maps_operations), 334328a6d671SEric W. Biederman #endif 3344631f9c18SAlexey Dobriyan REG("mem", S_IRUSR|S_IWUSR, proc_mem_operations), 3345631f9c18SAlexey Dobriyan LNK("cwd", proc_cwd_link), 3346631f9c18SAlexey Dobriyan LNK("root", proc_root_link), 3347631f9c18SAlexey Dobriyan LNK("exe", proc_exe_link), 3348631f9c18SAlexey Dobriyan REG("mounts", S_IRUGO, proc_mounts_operations), 3349631f9c18SAlexey Dobriyan REG("mountinfo", S_IRUGO, proc_mountinfo_operations), 33501e883281SMatt Mackall #ifdef CONFIG_PROC_PAGE_MONITOR 3351631f9c18SAlexey Dobriyan REG("clear_refs", S_IWUSR, proc_clear_refs_operations), 3352b7643757SSiddhesh Poyarekar REG("smaps", S_IRUGO, proc_tid_smaps_operations), 3353493b0e9dSDaniel Colascione REG("smaps_rollup", S_IRUGO, proc_pid_smaps_rollup_operations), 335432ed74a4SDjalal Harouni REG("pagemap", S_IRUSR, proc_pagemap_operations), 335528a6d671SEric W. Biederman #endif 335628a6d671SEric W. Biederman #ifdef CONFIG_SECURITY 3357631f9c18SAlexey Dobriyan DIR("attr", S_IRUGO|S_IXUGO, proc_attr_dir_inode_operations, proc_attr_dir_operations), 335828a6d671SEric W. Biederman #endif 335928a6d671SEric W. Biederman #ifdef CONFIG_KALLSYMS 3360edfcd606SAlexey Dobriyan ONE("wchan", S_IRUGO, proc_pid_wchan), 336128a6d671SEric W. Biederman #endif 33622ec220e2SKen Chen #ifdef CONFIG_STACKTRACE 336335a35046SDjalal Harouni ONE("stack", S_IRUSR, proc_pid_stack), 336428a6d671SEric W. Biederman #endif 33655968ceceSNaveen N. Rao #ifdef CONFIG_SCHED_INFO 3366f6e826caSAlexey Dobriyan ONE("schedstat", S_IRUGO, proc_pid_schedstat), 336728a6d671SEric W. Biederman #endif 33689745512cSArjan van de Ven #ifdef CONFIG_LATENCYTOP 3369631f9c18SAlexey Dobriyan REG("latency", S_IRUGO, proc_lstats_operations), 33709745512cSArjan van de Ven #endif 33718793d854SPaul Menage #ifdef CONFIG_PROC_PID_CPUSET 337252de4779SZefan Li ONE("cpuset", S_IRUGO, proc_cpuset_show), 337328a6d671SEric W. Biederman #endif 3374a424316cSPaul Menage #ifdef CONFIG_CGROUPS 3375006f4ac4SZefan Li ONE("cgroup", S_IRUGO, proc_cgroup_show), 3376a424316cSPaul Menage #endif 33776ba51e37SAlexey Dobriyan ONE("oom_score", S_IRUGO, proc_oom_score), 3378fa0cbbf1SDavid Rientjes REG("oom_adj", S_IRUGO|S_IWUSR, proc_oom_adj_operations), 3379a63d83f4SDavid Rientjes REG("oom_score_adj", S_IRUGO|S_IWUSR, proc_oom_score_adj_operations), 338028a6d671SEric W. Biederman #ifdef CONFIG_AUDITSYSCALL 3381631f9c18SAlexey Dobriyan REG("loginuid", S_IWUSR|S_IRUGO, proc_loginuid_operations), 338226ec3c64SAl Viro REG("sessionid", S_IRUGO, proc_sessionid_operations), 338328a6d671SEric W. Biederman #endif 3384f4f154fdSAkinobu Mita #ifdef CONFIG_FAULT_INJECTION 3385631f9c18SAlexey Dobriyan REG("make-it-fail", S_IRUGO|S_IWUSR, proc_fault_inject_operations), 33861203c8e6SAkinobu Mita REG("fail-nth", 0644, proc_fail_nth_operations), 3387f4f154fdSAkinobu Mita #endif 3388297c5d92SAndrea Righi #ifdef CONFIG_TASK_IO_ACCOUNTING 338919aadc98SAlexey Dobriyan ONE("io", S_IRUSR, proc_tid_io_accounting), 3390297c5d92SAndrea Righi #endif 339122d917d8SEric W. Biederman #ifdef CONFIG_USER_NS 339222d917d8SEric W. Biederman REG("uid_map", S_IRUGO|S_IWUSR, proc_uid_map_operations), 339322d917d8SEric W. Biederman REG("gid_map", S_IRUGO|S_IWUSR, proc_gid_map_operations), 3394f76d207aSEric W. Biederman REG("projid_map", S_IRUGO|S_IWUSR, proc_projid_map_operations), 33959cc46516SEric W. Biederman REG("setgroups", S_IRUGO|S_IWUSR, proc_setgroups_operations), 339622d917d8SEric W. Biederman #endif 33977c23b330SJosh Poimboeuf #ifdef CONFIG_LIVEPATCH 33987c23b330SJosh Poimboeuf ONE("patch_state", S_IRUSR, proc_pid_patch_state), 33997c23b330SJosh Poimboeuf #endif 340028a6d671SEric W. Biederman }; 340128a6d671SEric W. Biederman 3402f0c3b509SAl Viro static int proc_tid_base_readdir(struct file *file, struct dir_context *ctx) 340328a6d671SEric W. Biederman { 3404f0c3b509SAl Viro return proc_pident_readdir(file, ctx, 340528a6d671SEric W. Biederman tid_base_stuff, ARRAY_SIZE(tid_base_stuff)); 340628a6d671SEric W. Biederman } 340728a6d671SEric W. Biederman 340800cd8dd3SAl Viro static struct dentry *proc_tid_base_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags) 340900cd8dd3SAl Viro { 34107bcd6b0eSEric W. Biederman return proc_pident_lookup(dir, dentry, 34117bcd6b0eSEric W. Biederman tid_base_stuff, ARRAY_SIZE(tid_base_stuff)); 341228a6d671SEric W. Biederman } 341328a6d671SEric W. Biederman 341400977a59SArjan van de Ven static const struct file_operations proc_tid_base_operations = { 341528a6d671SEric W. Biederman .read = generic_read_dir, 3416f50752eaSAl Viro .iterate_shared = proc_tid_base_readdir, 3417f50752eaSAl Viro .llseek = generic_file_llseek, 341828a6d671SEric W. Biederman }; 341928a6d671SEric W. Biederman 3420c5ef1c42SArjan van de Ven static const struct inode_operations proc_tid_base_inode_operations = { 342128a6d671SEric W. Biederman .lookup = proc_tid_base_lookup, 342228a6d671SEric W. Biederman .getattr = pid_getattr, 342328a6d671SEric W. Biederman .setattr = proc_setattr, 342428a6d671SEric W. Biederman }; 342528a6d671SEric W. Biederman 34260168b9e3SAl Viro static struct dentry *proc_task_instantiate(struct dentry *dentry, 34270168b9e3SAl Viro struct task_struct *task, const void *ptr) 3428444ceed8SEric W. Biederman { 3429444ceed8SEric W. Biederman struct inode *inode; 34300168b9e3SAl Viro inode = proc_pid_make_inode(dentry->d_sb, task, S_IFDIR | S_IRUGO | S_IXUGO); 3431444ceed8SEric W. Biederman if (!inode) 34320168b9e3SAl Viro return ERR_PTR(-ENOENT); 34331bbc5513SAl Viro 3434444ceed8SEric W. Biederman inode->i_op = &proc_tid_base_inode_operations; 3435444ceed8SEric W. Biederman inode->i_fop = &proc_tid_base_operations; 3436444ceed8SEric W. Biederman inode->i_flags |= S_IMMUTABLE; 3437aed54175SVegard Nossum 34381270dd8dSAlexey Dobriyan set_nlink(inode, nlink_tid); 34391bbc5513SAl Viro pid_update_inode(task, inode); 3440444ceed8SEric W. Biederman 3441fb045adbSNick Piggin d_set_d_op(dentry, &pid_dentry_operations); 34420168b9e3SAl Viro return d_splice_alias(inode, dentry); 3443444ceed8SEric W. Biederman } 3444444ceed8SEric W. Biederman 344500cd8dd3SAl Viro static struct dentry *proc_task_lookup(struct inode *dir, struct dentry * dentry, unsigned int flags) 344628a6d671SEric W. Biederman { 344728a6d671SEric W. Biederman struct task_struct *task; 344828a6d671SEric W. Biederman struct task_struct *leader = get_proc_task(dir); 344928a6d671SEric W. Biederman unsigned tid; 3450b488893aSPavel Emelyanov struct pid_namespace *ns; 34510168b9e3SAl Viro struct dentry *result = ERR_PTR(-ENOENT); 345228a6d671SEric W. Biederman 345328a6d671SEric W. Biederman if (!leader) 345428a6d671SEric W. Biederman goto out_no_task; 345528a6d671SEric W. Biederman 3456dbcdb504SAlexey Dobriyan tid = name_to_int(&dentry->d_name); 345728a6d671SEric W. Biederman if (tid == ~0U) 345828a6d671SEric W. Biederman goto out; 345928a6d671SEric W. Biederman 3460b488893aSPavel Emelyanov ns = dentry->d_sb->s_fs_info; 346128a6d671SEric W. Biederman rcu_read_lock(); 3462b488893aSPavel Emelyanov task = find_task_by_pid_ns(tid, ns); 346328a6d671SEric W. Biederman if (task) 346428a6d671SEric W. Biederman get_task_struct(task); 346528a6d671SEric W. Biederman rcu_read_unlock(); 346628a6d671SEric W. Biederman if (!task) 346728a6d671SEric W. Biederman goto out; 3468bac0abd6SPavel Emelyanov if (!same_thread_group(leader, task)) 346928a6d671SEric W. Biederman goto out_drop_task; 347028a6d671SEric W. Biederman 34710168b9e3SAl Viro result = proc_task_instantiate(dentry, task, NULL); 347228a6d671SEric W. Biederman out_drop_task: 347328a6d671SEric W. Biederman put_task_struct(task); 347428a6d671SEric W. Biederman out: 347528a6d671SEric W. Biederman put_task_struct(leader); 347628a6d671SEric W. Biederman out_no_task: 34770168b9e3SAl Viro return result; 347828a6d671SEric W. Biederman } 347928a6d671SEric W. Biederman 348028a6d671SEric W. Biederman /* 34810bc58a91SEric W. Biederman * Find the first tid of a thread group to return to user space. 34820bc58a91SEric W. Biederman * 34830bc58a91SEric W. Biederman * Usually this is just the thread group leader, but if the users 34840bc58a91SEric W. Biederman * buffer was too small or there was a seek into the middle of the 34850bc58a91SEric W. Biederman * directory we have more work todo. 34860bc58a91SEric W. Biederman * 34870bc58a91SEric W. Biederman * In the case of a short read we start with find_task_by_pid. 34880bc58a91SEric W. Biederman * 34890bc58a91SEric W. Biederman * In the case of a seek we start with the leader and walk nr 34900bc58a91SEric W. Biederman * threads past it. 34910bc58a91SEric W. Biederman */ 34929f6e963fSOleg Nesterov static struct task_struct *first_tid(struct pid *pid, int tid, loff_t f_pos, 34939f6e963fSOleg Nesterov struct pid_namespace *ns) 34940bc58a91SEric W. Biederman { 3495d855a4b7SOleg Nesterov struct task_struct *pos, *task; 34969f6e963fSOleg Nesterov unsigned long nr = f_pos; 34979f6e963fSOleg Nesterov 34989f6e963fSOleg Nesterov if (nr != f_pos) /* 32bit overflow? */ 34999f6e963fSOleg Nesterov return NULL; 35000bc58a91SEric W. Biederman 3501cc288738SEric W. Biederman rcu_read_lock(); 3502d855a4b7SOleg Nesterov task = pid_task(pid, PIDTYPE_PID); 3503d855a4b7SOleg Nesterov if (!task) 3504d855a4b7SOleg Nesterov goto fail; 3505d855a4b7SOleg Nesterov 3506d855a4b7SOleg Nesterov /* Attempt to start with the tid of a thread */ 35079f6e963fSOleg Nesterov if (tid && nr) { 3508b488893aSPavel Emelyanov pos = find_task_by_pid_ns(tid, ns); 3509d855a4b7SOleg Nesterov if (pos && same_thread_group(pos, task)) 3510a872ff0cSOleg Nesterov goto found; 35110bc58a91SEric W. Biederman } 35120bc58a91SEric W. Biederman 35130bc58a91SEric W. Biederman /* If nr exceeds the number of threads there is nothing todo */ 35149f6e963fSOleg Nesterov if (nr >= get_nr_threads(task)) 3515c986c14aSOleg Nesterov goto fail; 3516a872ff0cSOleg Nesterov 3517a872ff0cSOleg Nesterov /* If we haven't found our starting place yet start 3518a872ff0cSOleg Nesterov * with the leader and walk nr threads forward. 3519a872ff0cSOleg Nesterov */ 3520d855a4b7SOleg Nesterov pos = task = task->group_leader; 3521c986c14aSOleg Nesterov do { 35229f6e963fSOleg Nesterov if (!nr--) 3523c986c14aSOleg Nesterov goto found; 3524d855a4b7SOleg Nesterov } while_each_thread(task, pos); 3525c986c14aSOleg Nesterov fail: 3526a872ff0cSOleg Nesterov pos = NULL; 3527a872ff0cSOleg Nesterov goto out; 3528a872ff0cSOleg Nesterov found: 3529a872ff0cSOleg Nesterov get_task_struct(pos); 3530a872ff0cSOleg Nesterov out: 3531cc288738SEric W. Biederman rcu_read_unlock(); 35320bc58a91SEric W. Biederman return pos; 35330bc58a91SEric W. Biederman } 35340bc58a91SEric W. Biederman 35350bc58a91SEric W. Biederman /* 35360bc58a91SEric W. Biederman * Find the next thread in the thread list. 35370bc58a91SEric W. Biederman * Return NULL if there is an error or no next thread. 35380bc58a91SEric W. Biederman * 35390bc58a91SEric W. Biederman * The reference to the input task_struct is released. 35400bc58a91SEric W. Biederman */ 35410bc58a91SEric W. Biederman static struct task_struct *next_tid(struct task_struct *start) 35420bc58a91SEric W. Biederman { 3543c1df7fb8SOleg Nesterov struct task_struct *pos = NULL; 3544cc288738SEric W. Biederman rcu_read_lock(); 3545c1df7fb8SOleg Nesterov if (pid_alive(start)) { 35460bc58a91SEric W. Biederman pos = next_thread(start); 3547c1df7fb8SOleg Nesterov if (thread_group_leader(pos)) 35480bc58a91SEric W. Biederman pos = NULL; 3549c1df7fb8SOleg Nesterov else 3550c1df7fb8SOleg Nesterov get_task_struct(pos); 3551c1df7fb8SOleg Nesterov } 3552cc288738SEric W. Biederman rcu_read_unlock(); 35530bc58a91SEric W. Biederman put_task_struct(start); 35540bc58a91SEric W. Biederman return pos; 35550bc58a91SEric W. Biederman } 35560bc58a91SEric W. Biederman 35571da177e4SLinus Torvalds /* for the /proc/TGID/task/ directories */ 3558f0c3b509SAl Viro static int proc_task_readdir(struct file *file, struct dir_context *ctx) 35591da177e4SLinus Torvalds { 3560d855a4b7SOleg Nesterov struct inode *inode = file_inode(file); 3561d855a4b7SOleg Nesterov struct task_struct *task; 3562b488893aSPavel Emelyanov struct pid_namespace *ns; 3563f0c3b509SAl Viro int tid; 35641da177e4SLinus Torvalds 3565d855a4b7SOleg Nesterov if (proc_inode_is_dead(inode)) 3566f0c3b509SAl Viro return -ENOENT; 35671da177e4SLinus Torvalds 3568f0c3b509SAl Viro if (!dir_emit_dots(file, ctx)) 3569d855a4b7SOleg Nesterov return 0; 35701da177e4SLinus Torvalds 35710bc58a91SEric W. Biederman /* f_version caches the tgid value that the last readdir call couldn't 35720bc58a91SEric W. Biederman * return. lseek aka telldir automagically resets f_version to 0. 35730bc58a91SEric W. Biederman */ 357476f668beSChristoph Hellwig ns = proc_pid_ns(inode); 3575f0c3b509SAl Viro tid = (int)file->f_version; 3576f0c3b509SAl Viro file->f_version = 0; 3577d855a4b7SOleg Nesterov for (task = first_tid(proc_pid(inode), tid, ctx->pos - 2, ns); 35780bc58a91SEric W. Biederman task; 3579f0c3b509SAl Viro task = next_tid(task), ctx->pos++) { 3580e3912ac3SAlexey Dobriyan char name[10 + 1]; 3581f0c3b509SAl Viro int len; 3582b488893aSPavel Emelyanov tid = task_pid_nr_ns(task, ns); 3583e3912ac3SAlexey Dobriyan len = snprintf(name, sizeof(name), "%u", tid); 3584f0c3b509SAl Viro if (!proc_fill_cache(file, ctx, name, len, 3585f0c3b509SAl Viro proc_task_instantiate, task, NULL)) { 35860bc58a91SEric W. Biederman /* returning this tgid failed, save it as the first 35870bc58a91SEric W. Biederman * pid for the next readir call */ 3588f0c3b509SAl Viro file->f_version = (u64)tid; 35890bc58a91SEric W. Biederman put_task_struct(task); 35901da177e4SLinus Torvalds break; 35910bc58a91SEric W. Biederman } 35921da177e4SLinus Torvalds } 3593d855a4b7SOleg Nesterov 3594f0c3b509SAl Viro return 0; 35951da177e4SLinus Torvalds } 35966e66b52bSEric W. Biederman 3597a528d35eSDavid Howells static int proc_task_getattr(const struct path *path, struct kstat *stat, 3598a528d35eSDavid Howells u32 request_mask, unsigned int query_flags) 35996e66b52bSEric W. Biederman { 3600a528d35eSDavid Howells struct inode *inode = d_inode(path->dentry); 360199f89551SEric W. Biederman struct task_struct *p = get_proc_task(inode); 36026e66b52bSEric W. Biederman generic_fillattr(inode, stat); 36036e66b52bSEric W. Biederman 360499f89551SEric W. Biederman if (p) { 360599f89551SEric W. Biederman stat->nlink += get_nr_threads(p); 360699f89551SEric W. Biederman put_task_struct(p); 36076e66b52bSEric W. Biederman } 36086e66b52bSEric W. Biederman 36096e66b52bSEric W. Biederman return 0; 36106e66b52bSEric W. Biederman } 361128a6d671SEric W. Biederman 3612c5ef1c42SArjan van de Ven static const struct inode_operations proc_task_inode_operations = { 361328a6d671SEric W. Biederman .lookup = proc_task_lookup, 361428a6d671SEric W. Biederman .getattr = proc_task_getattr, 361528a6d671SEric W. Biederman .setattr = proc_setattr, 36160499680aSVasiliy Kulikov .permission = proc_pid_permission, 361728a6d671SEric W. Biederman }; 361828a6d671SEric W. Biederman 361900977a59SArjan van de Ven static const struct file_operations proc_task_operations = { 362028a6d671SEric W. Biederman .read = generic_read_dir, 3621f50752eaSAl Viro .iterate_shared = proc_task_readdir, 3622f50752eaSAl Viro .llseek = generic_file_llseek, 362328a6d671SEric W. Biederman }; 36241270dd8dSAlexey Dobriyan 36251270dd8dSAlexey Dobriyan void __init set_proc_pid_nlink(void) 36261270dd8dSAlexey Dobriyan { 36271270dd8dSAlexey Dobriyan nlink_tid = pid_entry_nlink(tid_base_stuff, ARRAY_SIZE(tid_base_stuff)); 36281270dd8dSAlexey Dobriyan nlink_tgid = pid_entry_nlink(tgid_base_stuff, ARRAY_SIZE(tgid_base_stuff)); 36291270dd8dSAlexey Dobriyan } 3630