1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * linux/fs/proc/array.c 4 * 5 * Copyright (C) 1992 by Linus Torvalds 6 * based on ideas by Darren Senn 7 * 8 * Fixes: 9 * Michael. K. Johnson: stat,statm extensions. 10 * <johnsonm@stolaf.edu> 11 * 12 * Pauline Middelink : Made cmdline,envline only break at '\0's, to 13 * make sure SET_PROCTITLE works. Also removed 14 * bad '!' which forced address recalculation for 15 * EVERY character on the current page. 16 * <middelin@polyware.iaf.nl> 17 * 18 * Danny ter Haar : added cpuinfo 19 * <dth@cistron.nl> 20 * 21 * Alessandro Rubini : profile extension. 22 * <rubini@ipvvis.unipv.it> 23 * 24 * Jeff Tranter : added BogoMips field to cpuinfo 25 * <Jeff_Tranter@Mitel.COM> 26 * 27 * Bruno Haible : remove 4K limit for the maps file 28 * <haible@ma2s2.mathematik.uni-karlsruhe.de> 29 * 30 * Yves Arrouye : remove removal of trailing spaces in get_array. 31 * <Yves.Arrouye@marin.fdn.fr> 32 * 33 * Jerome Forissier : added per-CPU time information to /proc/stat 34 * and /proc/<pid>/cpu extension 35 * <forissier@isia.cma.fr> 36 * - Incorporation and non-SMP safe operation 37 * of forissier patch in 2.1.78 by 38 * Hans Marcus <crowbar@concepts.nl> 39 * 40 * aeb@cwi.nl : /proc/partitions 41 * 42 * 43 * Alan Cox : security fixes. 44 * <alan@lxorguk.ukuu.org.uk> 45 * 46 * Al Viro : safe handling of mm_struct 47 * 48 * Gerhard Wichert : added BIGMEM support 49 * Siemens AG <Gerhard.Wichert@pdb.siemens.de> 50 * 51 * Al Viro & Jeff Garzik : moved most of the thing into base.c and 52 * : proc_misc.c. The rest may eventually go into 53 * : base.c too. 54 */ 55 56 #include <linux/types.h> 57 #include <linux/errno.h> 58 #include <linux/time.h> 59 #include <linux/kernel.h> 60 #include <linux/kernel_stat.h> 61 #include <linux/tty.h> 62 #include <linux/string.h> 63 #include <linux/mman.h> 64 #include <linux/sched/mm.h> 65 #include <linux/sched/numa_balancing.h> 66 #include <linux/sched/task_stack.h> 67 #include <linux/sched/task.h> 68 #include <linux/sched/cputime.h> 69 #include <linux/proc_fs.h> 70 #include <linux/ioport.h> 71 #include <linux/uaccess.h> 72 #include <linux/io.h> 73 #include <linux/mm.h> 74 #include <linux/hugetlb.h> 75 #include <linux/pagemap.h> 76 #include <linux/swap.h> 77 #include <linux/smp.h> 78 #include <linux/signal.h> 79 #include <linux/highmem.h> 80 #include <linux/file.h> 81 #include <linux/fdtable.h> 82 #include <linux/times.h> 83 #include <linux/cpuset.h> 84 #include <linux/rcupdate.h> 85 #include <linux/delayacct.h> 86 #include <linux/seq_file.h> 87 #include <linux/pid_namespace.h> 88 #include <linux/prctl.h> 89 #include <linux/ptrace.h> 90 #include <linux/tracehook.h> 91 #include <linux/string_helpers.h> 92 #include <linux/user_namespace.h> 93 #include <linux/fs_struct.h> 94 95 #include <asm/pgtable.h> 96 #include <asm/processor.h> 97 #include "internal.h" 98 99 void proc_task_name(struct seq_file *m, struct task_struct *p, bool escape) 100 { 101 char *buf; 102 size_t size; 103 char tcomm[64]; 104 int ret; 105 106 if (p->flags & PF_WQ_WORKER) 107 wq_worker_comm(tcomm, sizeof(tcomm), p); 108 else 109 __get_task_comm(tcomm, sizeof(tcomm), p); 110 111 size = seq_get_buf(m, &buf); 112 if (escape) { 113 ret = string_escape_str(tcomm, buf, size, 114 ESCAPE_SPACE | ESCAPE_SPECIAL, "\n\\"); 115 if (ret >= size) 116 ret = -1; 117 } else { 118 ret = strscpy(buf, tcomm, size); 119 } 120 121 seq_commit(m, ret); 122 } 123 124 /* 125 * The task state array is a strange "bitmap" of 126 * reasons to sleep. Thus "running" is zero, and 127 * you can test for combinations of others with 128 * simple bit tests. 129 */ 130 static const char * const task_state_array[] = { 131 132 /* states in TASK_REPORT: */ 133 "R (running)", /* 0x00 */ 134 "S (sleeping)", /* 0x01 */ 135 "D (disk sleep)", /* 0x02 */ 136 "T (stopped)", /* 0x04 */ 137 "t (tracing stop)", /* 0x08 */ 138 "X (dead)", /* 0x10 */ 139 "Z (zombie)", /* 0x20 */ 140 "P (parked)", /* 0x40 */ 141 142 /* states beyond TASK_REPORT: */ 143 "I (idle)", /* 0x80 */ 144 }; 145 146 static inline const char *get_task_state(struct task_struct *tsk) 147 { 148 BUILD_BUG_ON(1 + ilog2(TASK_REPORT_MAX) != ARRAY_SIZE(task_state_array)); 149 return task_state_array[task_state_index(tsk)]; 150 } 151 152 static inline void task_state(struct seq_file *m, struct pid_namespace *ns, 153 struct pid *pid, struct task_struct *p) 154 { 155 struct user_namespace *user_ns = seq_user_ns(m); 156 struct group_info *group_info; 157 int g, umask = -1; 158 struct task_struct *tracer; 159 const struct cred *cred; 160 pid_t ppid, tpid = 0, tgid, ngid; 161 unsigned int max_fds = 0; 162 163 rcu_read_lock(); 164 ppid = pid_alive(p) ? 165 task_tgid_nr_ns(rcu_dereference(p->real_parent), ns) : 0; 166 167 tracer = ptrace_parent(p); 168 if (tracer) 169 tpid = task_pid_nr_ns(tracer, ns); 170 171 tgid = task_tgid_nr_ns(p, ns); 172 ngid = task_numa_group_id(p); 173 cred = get_task_cred(p); 174 175 task_lock(p); 176 if (p->fs) 177 umask = p->fs->umask; 178 if (p->files) 179 max_fds = files_fdtable(p->files)->max_fds; 180 task_unlock(p); 181 rcu_read_unlock(); 182 183 if (umask >= 0) 184 seq_printf(m, "Umask:\t%#04o\n", umask); 185 seq_puts(m, "State:\t"); 186 seq_puts(m, get_task_state(p)); 187 188 seq_put_decimal_ull(m, "\nTgid:\t", tgid); 189 seq_put_decimal_ull(m, "\nNgid:\t", ngid); 190 seq_put_decimal_ull(m, "\nPid:\t", pid_nr_ns(pid, ns)); 191 seq_put_decimal_ull(m, "\nPPid:\t", ppid); 192 seq_put_decimal_ull(m, "\nTracerPid:\t", tpid); 193 seq_put_decimal_ull(m, "\nUid:\t", from_kuid_munged(user_ns, cred->uid)); 194 seq_put_decimal_ull(m, "\t", from_kuid_munged(user_ns, cred->euid)); 195 seq_put_decimal_ull(m, "\t", from_kuid_munged(user_ns, cred->suid)); 196 seq_put_decimal_ull(m, "\t", from_kuid_munged(user_ns, cred->fsuid)); 197 seq_put_decimal_ull(m, "\nGid:\t", from_kgid_munged(user_ns, cred->gid)); 198 seq_put_decimal_ull(m, "\t", from_kgid_munged(user_ns, cred->egid)); 199 seq_put_decimal_ull(m, "\t", from_kgid_munged(user_ns, cred->sgid)); 200 seq_put_decimal_ull(m, "\t", from_kgid_munged(user_ns, cred->fsgid)); 201 seq_put_decimal_ull(m, "\nFDSize:\t", max_fds); 202 203 seq_puts(m, "\nGroups:\t"); 204 group_info = cred->group_info; 205 for (g = 0; g < group_info->ngroups; g++) 206 seq_put_decimal_ull(m, g ? " " : "", 207 from_kgid_munged(user_ns, group_info->gid[g])); 208 put_cred(cred); 209 /* Trailing space shouldn't have been added in the first place. */ 210 seq_putc(m, ' '); 211 212 #ifdef CONFIG_PID_NS 213 seq_puts(m, "\nNStgid:"); 214 for (g = ns->level; g <= pid->level; g++) 215 seq_put_decimal_ull(m, "\t", task_tgid_nr_ns(p, pid->numbers[g].ns)); 216 seq_puts(m, "\nNSpid:"); 217 for (g = ns->level; g <= pid->level; g++) 218 seq_put_decimal_ull(m, "\t", task_pid_nr_ns(p, pid->numbers[g].ns)); 219 seq_puts(m, "\nNSpgid:"); 220 for (g = ns->level; g <= pid->level; g++) 221 seq_put_decimal_ull(m, "\t", task_pgrp_nr_ns(p, pid->numbers[g].ns)); 222 seq_puts(m, "\nNSsid:"); 223 for (g = ns->level; g <= pid->level; g++) 224 seq_put_decimal_ull(m, "\t", task_session_nr_ns(p, pid->numbers[g].ns)); 225 #endif 226 seq_putc(m, '\n'); 227 } 228 229 void render_sigset_t(struct seq_file *m, const char *header, 230 sigset_t *set) 231 { 232 int i; 233 234 seq_puts(m, header); 235 236 i = _NSIG; 237 do { 238 int x = 0; 239 240 i -= 4; 241 if (sigismember(set, i+1)) x |= 1; 242 if (sigismember(set, i+2)) x |= 2; 243 if (sigismember(set, i+3)) x |= 4; 244 if (sigismember(set, i+4)) x |= 8; 245 seq_putc(m, hex_asc[x]); 246 } while (i >= 4); 247 248 seq_putc(m, '\n'); 249 } 250 251 static void collect_sigign_sigcatch(struct task_struct *p, sigset_t *ign, 252 sigset_t *catch) 253 { 254 struct k_sigaction *k; 255 int i; 256 257 k = p->sighand->action; 258 for (i = 1; i <= _NSIG; ++i, ++k) { 259 if (k->sa.sa_handler == SIG_IGN) 260 sigaddset(ign, i); 261 else if (k->sa.sa_handler != SIG_DFL) 262 sigaddset(catch, i); 263 } 264 } 265 266 static inline void task_sig(struct seq_file *m, struct task_struct *p) 267 { 268 unsigned long flags; 269 sigset_t pending, shpending, blocked, ignored, caught; 270 int num_threads = 0; 271 unsigned int qsize = 0; 272 unsigned long qlim = 0; 273 274 sigemptyset(&pending); 275 sigemptyset(&shpending); 276 sigemptyset(&blocked); 277 sigemptyset(&ignored); 278 sigemptyset(&caught); 279 280 if (lock_task_sighand(p, &flags)) { 281 pending = p->pending.signal; 282 shpending = p->signal->shared_pending.signal; 283 blocked = p->blocked; 284 collect_sigign_sigcatch(p, &ignored, &caught); 285 num_threads = get_nr_threads(p); 286 rcu_read_lock(); /* FIXME: is this correct? */ 287 qsize = atomic_read(&__task_cred(p)->user->sigpending); 288 rcu_read_unlock(); 289 qlim = task_rlimit(p, RLIMIT_SIGPENDING); 290 unlock_task_sighand(p, &flags); 291 } 292 293 seq_put_decimal_ull(m, "Threads:\t", num_threads); 294 seq_put_decimal_ull(m, "\nSigQ:\t", qsize); 295 seq_put_decimal_ull(m, "/", qlim); 296 297 /* render them all */ 298 render_sigset_t(m, "\nSigPnd:\t", &pending); 299 render_sigset_t(m, "ShdPnd:\t", &shpending); 300 render_sigset_t(m, "SigBlk:\t", &blocked); 301 render_sigset_t(m, "SigIgn:\t", &ignored); 302 render_sigset_t(m, "SigCgt:\t", &caught); 303 } 304 305 static void render_cap_t(struct seq_file *m, const char *header, 306 kernel_cap_t *a) 307 { 308 unsigned __capi; 309 310 seq_puts(m, header); 311 CAP_FOR_EACH_U32(__capi) { 312 seq_put_hex_ll(m, NULL, 313 a->cap[CAP_LAST_U32 - __capi], 8); 314 } 315 seq_putc(m, '\n'); 316 } 317 318 static inline void task_cap(struct seq_file *m, struct task_struct *p) 319 { 320 const struct cred *cred; 321 kernel_cap_t cap_inheritable, cap_permitted, cap_effective, 322 cap_bset, cap_ambient; 323 324 rcu_read_lock(); 325 cred = __task_cred(p); 326 cap_inheritable = cred->cap_inheritable; 327 cap_permitted = cred->cap_permitted; 328 cap_effective = cred->cap_effective; 329 cap_bset = cred->cap_bset; 330 cap_ambient = cred->cap_ambient; 331 rcu_read_unlock(); 332 333 render_cap_t(m, "CapInh:\t", &cap_inheritable); 334 render_cap_t(m, "CapPrm:\t", &cap_permitted); 335 render_cap_t(m, "CapEff:\t", &cap_effective); 336 render_cap_t(m, "CapBnd:\t", &cap_bset); 337 render_cap_t(m, "CapAmb:\t", &cap_ambient); 338 } 339 340 static inline void task_seccomp(struct seq_file *m, struct task_struct *p) 341 { 342 seq_put_decimal_ull(m, "NoNewPrivs:\t", task_no_new_privs(p)); 343 #ifdef CONFIG_SECCOMP 344 seq_put_decimal_ull(m, "\nSeccomp:\t", p->seccomp.mode); 345 #endif 346 seq_printf(m, "\nSpeculation_Store_Bypass:\t"); 347 switch (arch_prctl_spec_ctrl_get(p, PR_SPEC_STORE_BYPASS)) { 348 case -EINVAL: 349 seq_printf(m, "unknown"); 350 break; 351 case PR_SPEC_NOT_AFFECTED: 352 seq_printf(m, "not vulnerable"); 353 break; 354 case PR_SPEC_PRCTL | PR_SPEC_FORCE_DISABLE: 355 seq_printf(m, "thread force mitigated"); 356 break; 357 case PR_SPEC_PRCTL | PR_SPEC_DISABLE: 358 seq_printf(m, "thread mitigated"); 359 break; 360 case PR_SPEC_PRCTL | PR_SPEC_ENABLE: 361 seq_printf(m, "thread vulnerable"); 362 break; 363 case PR_SPEC_DISABLE: 364 seq_printf(m, "globally mitigated"); 365 break; 366 default: 367 seq_printf(m, "vulnerable"); 368 break; 369 } 370 seq_putc(m, '\n'); 371 } 372 373 static inline void task_context_switch_counts(struct seq_file *m, 374 struct task_struct *p) 375 { 376 seq_put_decimal_ull(m, "voluntary_ctxt_switches:\t", p->nvcsw); 377 seq_put_decimal_ull(m, "\nnonvoluntary_ctxt_switches:\t", p->nivcsw); 378 seq_putc(m, '\n'); 379 } 380 381 static void task_cpus_allowed(struct seq_file *m, struct task_struct *task) 382 { 383 seq_printf(m, "Cpus_allowed:\t%*pb\n", 384 cpumask_pr_args(&task->cpus_allowed)); 385 seq_printf(m, "Cpus_allowed_list:\t%*pbl\n", 386 cpumask_pr_args(&task->cpus_allowed)); 387 } 388 389 static inline void task_core_dumping(struct seq_file *m, struct mm_struct *mm) 390 { 391 seq_put_decimal_ull(m, "CoreDumping:\t", !!mm->core_state); 392 seq_putc(m, '\n'); 393 } 394 395 int proc_pid_status(struct seq_file *m, struct pid_namespace *ns, 396 struct pid *pid, struct task_struct *task) 397 { 398 struct mm_struct *mm = get_task_mm(task); 399 400 seq_puts(m, "Name:\t"); 401 proc_task_name(m, task, true); 402 seq_putc(m, '\n'); 403 404 task_state(m, ns, pid, task); 405 406 if (mm) { 407 task_mem(m, mm); 408 task_core_dumping(m, mm); 409 mmput(mm); 410 } 411 task_sig(m, task); 412 task_cap(m, task); 413 task_seccomp(m, task); 414 task_cpus_allowed(m, task); 415 cpuset_task_status_allowed(m, task); 416 task_context_switch_counts(m, task); 417 return 0; 418 } 419 420 static int do_task_stat(struct seq_file *m, struct pid_namespace *ns, 421 struct pid *pid, struct task_struct *task, int whole) 422 { 423 unsigned long vsize, eip, esp, wchan = 0; 424 int priority, nice; 425 int tty_pgrp = -1, tty_nr = 0; 426 sigset_t sigign, sigcatch; 427 char state; 428 pid_t ppid = 0, pgid = -1, sid = -1; 429 int num_threads = 0; 430 int permitted; 431 struct mm_struct *mm; 432 unsigned long long start_time; 433 unsigned long cmin_flt = 0, cmaj_flt = 0; 434 unsigned long min_flt = 0, maj_flt = 0; 435 u64 cutime, cstime, utime, stime; 436 u64 cgtime, gtime; 437 unsigned long rsslim = 0; 438 unsigned long flags; 439 440 state = *get_task_state(task); 441 vsize = eip = esp = 0; 442 permitted = ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS | PTRACE_MODE_NOAUDIT); 443 mm = get_task_mm(task); 444 if (mm) { 445 vsize = task_vsize(mm); 446 /* 447 * esp and eip are intentionally zeroed out. There is no 448 * non-racy way to read them without freezing the task. 449 * Programs that need reliable values can use ptrace(2). 450 * 451 * The only exception is if the task is core dumping because 452 * a program is not able to use ptrace(2) in that case. It is 453 * safe because the task has stopped executing permanently. 454 */ 455 if (permitted && (task->flags & PF_DUMPCORE)) { 456 if (try_get_task_stack(task)) { 457 eip = KSTK_EIP(task); 458 esp = KSTK_ESP(task); 459 put_task_stack(task); 460 } 461 } 462 } 463 464 sigemptyset(&sigign); 465 sigemptyset(&sigcatch); 466 cutime = cstime = utime = stime = 0; 467 cgtime = gtime = 0; 468 469 if (lock_task_sighand(task, &flags)) { 470 struct signal_struct *sig = task->signal; 471 472 if (sig->tty) { 473 struct pid *pgrp = tty_get_pgrp(sig->tty); 474 tty_pgrp = pid_nr_ns(pgrp, ns); 475 put_pid(pgrp); 476 tty_nr = new_encode_dev(tty_devnum(sig->tty)); 477 } 478 479 num_threads = get_nr_threads(task); 480 collect_sigign_sigcatch(task, &sigign, &sigcatch); 481 482 cmin_flt = sig->cmin_flt; 483 cmaj_flt = sig->cmaj_flt; 484 cutime = sig->cutime; 485 cstime = sig->cstime; 486 cgtime = sig->cgtime; 487 rsslim = READ_ONCE(sig->rlim[RLIMIT_RSS].rlim_cur); 488 489 /* add up live thread stats at the group level */ 490 if (whole) { 491 struct task_struct *t = task; 492 do { 493 min_flt += t->min_flt; 494 maj_flt += t->maj_flt; 495 gtime += task_gtime(t); 496 } while_each_thread(task, t); 497 498 min_flt += sig->min_flt; 499 maj_flt += sig->maj_flt; 500 thread_group_cputime_adjusted(task, &utime, &stime); 501 gtime += sig->gtime; 502 } 503 504 sid = task_session_nr_ns(task, ns); 505 ppid = task_tgid_nr_ns(task->real_parent, ns); 506 pgid = task_pgrp_nr_ns(task, ns); 507 508 unlock_task_sighand(task, &flags); 509 } 510 511 if (permitted && (!whole || num_threads < 2)) 512 wchan = get_wchan(task); 513 if (!whole) { 514 min_flt = task->min_flt; 515 maj_flt = task->maj_flt; 516 task_cputime_adjusted(task, &utime, &stime); 517 gtime = task_gtime(task); 518 } 519 520 /* scale priority and nice values from timeslices to -20..20 */ 521 /* to make it look like a "normal" Unix priority/nice value */ 522 priority = task_prio(task); 523 nice = task_nice(task); 524 525 /* convert nsec -> ticks */ 526 start_time = nsec_to_clock_t(task->real_start_time); 527 528 seq_put_decimal_ull(m, "", pid_nr_ns(pid, ns)); 529 seq_puts(m, " ("); 530 proc_task_name(m, task, false); 531 seq_puts(m, ") "); 532 seq_putc(m, state); 533 seq_put_decimal_ll(m, " ", ppid); 534 seq_put_decimal_ll(m, " ", pgid); 535 seq_put_decimal_ll(m, " ", sid); 536 seq_put_decimal_ll(m, " ", tty_nr); 537 seq_put_decimal_ll(m, " ", tty_pgrp); 538 seq_put_decimal_ull(m, " ", task->flags); 539 seq_put_decimal_ull(m, " ", min_flt); 540 seq_put_decimal_ull(m, " ", cmin_flt); 541 seq_put_decimal_ull(m, " ", maj_flt); 542 seq_put_decimal_ull(m, " ", cmaj_flt); 543 seq_put_decimal_ull(m, " ", nsec_to_clock_t(utime)); 544 seq_put_decimal_ull(m, " ", nsec_to_clock_t(stime)); 545 seq_put_decimal_ll(m, " ", nsec_to_clock_t(cutime)); 546 seq_put_decimal_ll(m, " ", nsec_to_clock_t(cstime)); 547 seq_put_decimal_ll(m, " ", priority); 548 seq_put_decimal_ll(m, " ", nice); 549 seq_put_decimal_ll(m, " ", num_threads); 550 seq_put_decimal_ull(m, " ", 0); 551 seq_put_decimal_ull(m, " ", start_time); 552 seq_put_decimal_ull(m, " ", vsize); 553 seq_put_decimal_ull(m, " ", mm ? get_mm_rss(mm) : 0); 554 seq_put_decimal_ull(m, " ", rsslim); 555 seq_put_decimal_ull(m, " ", mm ? (permitted ? mm->start_code : 1) : 0); 556 seq_put_decimal_ull(m, " ", mm ? (permitted ? mm->end_code : 1) : 0); 557 seq_put_decimal_ull(m, " ", (permitted && mm) ? mm->start_stack : 0); 558 seq_put_decimal_ull(m, " ", esp); 559 seq_put_decimal_ull(m, " ", eip); 560 /* The signal information here is obsolete. 561 * It must be decimal for Linux 2.0 compatibility. 562 * Use /proc/#/status for real-time signals. 563 */ 564 seq_put_decimal_ull(m, " ", task->pending.signal.sig[0] & 0x7fffffffUL); 565 seq_put_decimal_ull(m, " ", task->blocked.sig[0] & 0x7fffffffUL); 566 seq_put_decimal_ull(m, " ", sigign.sig[0] & 0x7fffffffUL); 567 seq_put_decimal_ull(m, " ", sigcatch.sig[0] & 0x7fffffffUL); 568 569 /* 570 * We used to output the absolute kernel address, but that's an 571 * information leak - so instead we show a 0/1 flag here, to signal 572 * to user-space whether there's a wchan field in /proc/PID/wchan. 573 * 574 * This works with older implementations of procps as well. 575 */ 576 if (wchan) 577 seq_puts(m, " 1"); 578 else 579 seq_puts(m, " 0"); 580 581 seq_put_decimal_ull(m, " ", 0); 582 seq_put_decimal_ull(m, " ", 0); 583 seq_put_decimal_ll(m, " ", task->exit_signal); 584 seq_put_decimal_ll(m, " ", task_cpu(task)); 585 seq_put_decimal_ull(m, " ", task->rt_priority); 586 seq_put_decimal_ull(m, " ", task->policy); 587 seq_put_decimal_ull(m, " ", delayacct_blkio_ticks(task)); 588 seq_put_decimal_ull(m, " ", nsec_to_clock_t(gtime)); 589 seq_put_decimal_ll(m, " ", nsec_to_clock_t(cgtime)); 590 591 if (mm && permitted) { 592 seq_put_decimal_ull(m, " ", mm->start_data); 593 seq_put_decimal_ull(m, " ", mm->end_data); 594 seq_put_decimal_ull(m, " ", mm->start_brk); 595 seq_put_decimal_ull(m, " ", mm->arg_start); 596 seq_put_decimal_ull(m, " ", mm->arg_end); 597 seq_put_decimal_ull(m, " ", mm->env_start); 598 seq_put_decimal_ull(m, " ", mm->env_end); 599 } else 600 seq_puts(m, " 0 0 0 0 0 0 0"); 601 602 if (permitted) 603 seq_put_decimal_ll(m, " ", task->exit_code); 604 else 605 seq_puts(m, " 0"); 606 607 seq_putc(m, '\n'); 608 if (mm) 609 mmput(mm); 610 return 0; 611 } 612 613 int proc_tid_stat(struct seq_file *m, struct pid_namespace *ns, 614 struct pid *pid, struct task_struct *task) 615 { 616 return do_task_stat(m, ns, pid, task, 0); 617 } 618 619 int proc_tgid_stat(struct seq_file *m, struct pid_namespace *ns, 620 struct pid *pid, struct task_struct *task) 621 { 622 return do_task_stat(m, ns, pid, task, 1); 623 } 624 625 int proc_pid_statm(struct seq_file *m, struct pid_namespace *ns, 626 struct pid *pid, struct task_struct *task) 627 { 628 unsigned long size = 0, resident = 0, shared = 0, text = 0, data = 0; 629 struct mm_struct *mm = get_task_mm(task); 630 631 if (mm) { 632 size = task_statm(mm, &shared, &text, &data, &resident); 633 mmput(mm); 634 } 635 /* 636 * For quick read, open code by putting numbers directly 637 * expected format is 638 * seq_printf(m, "%lu %lu %lu %lu 0 %lu 0\n", 639 * size, resident, shared, text, data); 640 */ 641 seq_put_decimal_ull(m, "", size); 642 seq_put_decimal_ull(m, " ", resident); 643 seq_put_decimal_ull(m, " ", shared); 644 seq_put_decimal_ull(m, " ", text); 645 seq_put_decimal_ull(m, " ", 0); 646 seq_put_decimal_ull(m, " ", data); 647 seq_put_decimal_ull(m, " ", 0); 648 seq_putc(m, '\n'); 649 650 return 0; 651 } 652 653 #ifdef CONFIG_PROC_CHILDREN 654 static struct pid * 655 get_children_pid(struct inode *inode, struct pid *pid_prev, loff_t pos) 656 { 657 struct task_struct *start, *task; 658 struct pid *pid = NULL; 659 660 read_lock(&tasklist_lock); 661 662 start = pid_task(proc_pid(inode), PIDTYPE_PID); 663 if (!start) 664 goto out; 665 666 /* 667 * Lets try to continue searching first, this gives 668 * us significant speedup on children-rich processes. 669 */ 670 if (pid_prev) { 671 task = pid_task(pid_prev, PIDTYPE_PID); 672 if (task && task->real_parent == start && 673 !(list_empty(&task->sibling))) { 674 if (list_is_last(&task->sibling, &start->children)) 675 goto out; 676 task = list_first_entry(&task->sibling, 677 struct task_struct, sibling); 678 pid = get_pid(task_pid(task)); 679 goto out; 680 } 681 } 682 683 /* 684 * Slow search case. 685 * 686 * We might miss some children here if children 687 * are exited while we were not holding the lock, 688 * but it was never promised to be accurate that 689 * much. 690 * 691 * "Just suppose that the parent sleeps, but N children 692 * exit after we printed their tids. Now the slow paths 693 * skips N extra children, we miss N tasks." (c) 694 * 695 * So one need to stop or freeze the leader and all 696 * its children to get a precise result. 697 */ 698 list_for_each_entry(task, &start->children, sibling) { 699 if (pos-- == 0) { 700 pid = get_pid(task_pid(task)); 701 break; 702 } 703 } 704 705 out: 706 read_unlock(&tasklist_lock); 707 return pid; 708 } 709 710 static int children_seq_show(struct seq_file *seq, void *v) 711 { 712 struct inode *inode = file_inode(seq->file); 713 714 seq_printf(seq, "%d ", pid_nr_ns(v, proc_pid_ns(inode))); 715 return 0; 716 } 717 718 static void *children_seq_start(struct seq_file *seq, loff_t *pos) 719 { 720 return get_children_pid(file_inode(seq->file), NULL, *pos); 721 } 722 723 static void *children_seq_next(struct seq_file *seq, void *v, loff_t *pos) 724 { 725 struct pid *pid; 726 727 pid = get_children_pid(file_inode(seq->file), v, *pos + 1); 728 put_pid(v); 729 730 ++*pos; 731 return pid; 732 } 733 734 static void children_seq_stop(struct seq_file *seq, void *v) 735 { 736 put_pid(v); 737 } 738 739 static const struct seq_operations children_seq_ops = { 740 .start = children_seq_start, 741 .next = children_seq_next, 742 .stop = children_seq_stop, 743 .show = children_seq_show, 744 }; 745 746 static int children_seq_open(struct inode *inode, struct file *file) 747 { 748 return seq_open(file, &children_seq_ops); 749 } 750 751 const struct file_operations proc_tid_children_operations = { 752 .open = children_seq_open, 753 .read = seq_read, 754 .llseek = seq_lseek, 755 .release = seq_release, 756 }; 757 #endif /* CONFIG_PROC_CHILDREN */ 758