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/processor.h> 96 #include "internal.h" 97 98 void proc_task_name(struct seq_file *m, struct task_struct *p, bool escape) 99 { 100 char *buf; 101 size_t size; 102 char tcomm[64]; 103 int ret; 104 105 if (p->flags & PF_WQ_WORKER) 106 wq_worker_comm(tcomm, sizeof(tcomm), p); 107 else 108 __get_task_comm(tcomm, sizeof(tcomm), p); 109 110 size = seq_get_buf(m, &buf); 111 if (escape) { 112 ret = string_escape_str(tcomm, buf, size, 113 ESCAPE_SPACE | ESCAPE_SPECIAL, "\n\\"); 114 if (ret >= size) 115 ret = -1; 116 } else { 117 ret = strscpy(buf, tcomm, size); 118 } 119 120 seq_commit(m, ret); 121 } 122 123 /* 124 * The task state array is a strange "bitmap" of 125 * reasons to sleep. Thus "running" is zero, and 126 * you can test for combinations of others with 127 * simple bit tests. 128 */ 129 static const char * const task_state_array[] = { 130 131 /* states in TASK_REPORT: */ 132 "R (running)", /* 0x00 */ 133 "S (sleeping)", /* 0x01 */ 134 "D (disk sleep)", /* 0x02 */ 135 "T (stopped)", /* 0x04 */ 136 "t (tracing stop)", /* 0x08 */ 137 "X (dead)", /* 0x10 */ 138 "Z (zombie)", /* 0x20 */ 139 "P (parked)", /* 0x40 */ 140 141 /* states beyond TASK_REPORT: */ 142 "I (idle)", /* 0x80 */ 143 }; 144 145 static inline const char *get_task_state(struct task_struct *tsk) 146 { 147 BUILD_BUG_ON(1 + ilog2(TASK_REPORT_MAX) != ARRAY_SIZE(task_state_array)); 148 return task_state_array[task_state_index(tsk)]; 149 } 150 151 static inline void task_state(struct seq_file *m, struct pid_namespace *ns, 152 struct pid *pid, struct task_struct *p) 153 { 154 struct user_namespace *user_ns = seq_user_ns(m); 155 struct group_info *group_info; 156 int g, umask = -1; 157 struct task_struct *tracer; 158 const struct cred *cred; 159 pid_t ppid, tpid = 0, tgid, ngid; 160 unsigned int max_fds = 0; 161 162 rcu_read_lock(); 163 ppid = pid_alive(p) ? 164 task_tgid_nr_ns(rcu_dereference(p->real_parent), ns) : 0; 165 166 tracer = ptrace_parent(p); 167 if (tracer) 168 tpid = task_pid_nr_ns(tracer, ns); 169 170 tgid = task_tgid_nr_ns(p, ns); 171 ngid = task_numa_group_id(p); 172 cred = get_task_cred(p); 173 174 task_lock(p); 175 if (p->fs) 176 umask = p->fs->umask; 177 if (p->files) 178 max_fds = files_fdtable(p->files)->max_fds; 179 task_unlock(p); 180 rcu_read_unlock(); 181 182 if (umask >= 0) 183 seq_printf(m, "Umask:\t%#04o\n", umask); 184 seq_puts(m, "State:\t"); 185 seq_puts(m, get_task_state(p)); 186 187 seq_put_decimal_ull(m, "\nTgid:\t", tgid); 188 seq_put_decimal_ull(m, "\nNgid:\t", ngid); 189 seq_put_decimal_ull(m, "\nPid:\t", pid_nr_ns(pid, ns)); 190 seq_put_decimal_ull(m, "\nPPid:\t", ppid); 191 seq_put_decimal_ull(m, "\nTracerPid:\t", tpid); 192 seq_put_decimal_ull(m, "\nUid:\t", from_kuid_munged(user_ns, cred->uid)); 193 seq_put_decimal_ull(m, "\t", from_kuid_munged(user_ns, cred->euid)); 194 seq_put_decimal_ull(m, "\t", from_kuid_munged(user_ns, cred->suid)); 195 seq_put_decimal_ull(m, "\t", from_kuid_munged(user_ns, cred->fsuid)); 196 seq_put_decimal_ull(m, "\nGid:\t", from_kgid_munged(user_ns, cred->gid)); 197 seq_put_decimal_ull(m, "\t", from_kgid_munged(user_ns, cred->egid)); 198 seq_put_decimal_ull(m, "\t", from_kgid_munged(user_ns, cred->sgid)); 199 seq_put_decimal_ull(m, "\t", from_kgid_munged(user_ns, cred->fsgid)); 200 seq_put_decimal_ull(m, "\nFDSize:\t", max_fds); 201 202 seq_puts(m, "\nGroups:\t"); 203 group_info = cred->group_info; 204 for (g = 0; g < group_info->ngroups; g++) 205 seq_put_decimal_ull(m, g ? " " : "", 206 from_kgid_munged(user_ns, group_info->gid[g])); 207 put_cred(cred); 208 /* Trailing space shouldn't have been added in the first place. */ 209 seq_putc(m, ' '); 210 211 #ifdef CONFIG_PID_NS 212 seq_puts(m, "\nNStgid:"); 213 for (g = ns->level; g <= pid->level; g++) 214 seq_put_decimal_ull(m, "\t", task_tgid_nr_ns(p, pid->numbers[g].ns)); 215 seq_puts(m, "\nNSpid:"); 216 for (g = ns->level; g <= pid->level; g++) 217 seq_put_decimal_ull(m, "\t", task_pid_nr_ns(p, pid->numbers[g].ns)); 218 seq_puts(m, "\nNSpgid:"); 219 for (g = ns->level; g <= pid->level; g++) 220 seq_put_decimal_ull(m, "\t", task_pgrp_nr_ns(p, pid->numbers[g].ns)); 221 seq_puts(m, "\nNSsid:"); 222 for (g = ns->level; g <= pid->level; g++) 223 seq_put_decimal_ull(m, "\t", task_session_nr_ns(p, pid->numbers[g].ns)); 224 #endif 225 seq_putc(m, '\n'); 226 } 227 228 void render_sigset_t(struct seq_file *m, const char *header, 229 sigset_t *set) 230 { 231 int i; 232 233 seq_puts(m, header); 234 235 i = _NSIG; 236 do { 237 int x = 0; 238 239 i -= 4; 240 if (sigismember(set, i+1)) x |= 1; 241 if (sigismember(set, i+2)) x |= 2; 242 if (sigismember(set, i+3)) x |= 4; 243 if (sigismember(set, i+4)) x |= 8; 244 seq_putc(m, hex_asc[x]); 245 } while (i >= 4); 246 247 seq_putc(m, '\n'); 248 } 249 250 static void collect_sigign_sigcatch(struct task_struct *p, sigset_t *sigign, 251 sigset_t *sigcatch) 252 { 253 struct k_sigaction *k; 254 int i; 255 256 k = p->sighand->action; 257 for (i = 1; i <= _NSIG; ++i, ++k) { 258 if (k->sa.sa_handler == SIG_IGN) 259 sigaddset(sigign, i); 260 else if (k->sa.sa_handler != SIG_DFL) 261 sigaddset(sigcatch, i); 262 } 263 } 264 265 static inline void task_sig(struct seq_file *m, struct task_struct *p) 266 { 267 unsigned long flags; 268 sigset_t pending, shpending, blocked, ignored, caught; 269 int num_threads = 0; 270 unsigned int qsize = 0; 271 unsigned long qlim = 0; 272 273 sigemptyset(&pending); 274 sigemptyset(&shpending); 275 sigemptyset(&blocked); 276 sigemptyset(&ignored); 277 sigemptyset(&caught); 278 279 if (lock_task_sighand(p, &flags)) { 280 pending = p->pending.signal; 281 shpending = p->signal->shared_pending.signal; 282 blocked = p->blocked; 283 collect_sigign_sigcatch(p, &ignored, &caught); 284 num_threads = get_nr_threads(p); 285 rcu_read_lock(); /* FIXME: is this correct? */ 286 qsize = atomic_read(&__task_cred(p)->user->sigpending); 287 rcu_read_unlock(); 288 qlim = task_rlimit(p, RLIMIT_SIGPENDING); 289 unlock_task_sighand(p, &flags); 290 } 291 292 seq_put_decimal_ull(m, "Threads:\t", num_threads); 293 seq_put_decimal_ull(m, "\nSigQ:\t", qsize); 294 seq_put_decimal_ull(m, "/", qlim); 295 296 /* render them all */ 297 render_sigset_t(m, "\nSigPnd:\t", &pending); 298 render_sigset_t(m, "ShdPnd:\t", &shpending); 299 render_sigset_t(m, "SigBlk:\t", &blocked); 300 render_sigset_t(m, "SigIgn:\t", &ignored); 301 render_sigset_t(m, "SigCgt:\t", &caught); 302 } 303 304 static void render_cap_t(struct seq_file *m, const char *header, 305 kernel_cap_t *a) 306 { 307 unsigned __capi; 308 309 seq_puts(m, header); 310 CAP_FOR_EACH_U32(__capi) { 311 seq_put_hex_ll(m, NULL, 312 a->cap[CAP_LAST_U32 - __capi], 8); 313 } 314 seq_putc(m, '\n'); 315 } 316 317 static inline void task_cap(struct seq_file *m, struct task_struct *p) 318 { 319 const struct cred *cred; 320 kernel_cap_t cap_inheritable, cap_permitted, cap_effective, 321 cap_bset, cap_ambient; 322 323 rcu_read_lock(); 324 cred = __task_cred(p); 325 cap_inheritable = cred->cap_inheritable; 326 cap_permitted = cred->cap_permitted; 327 cap_effective = cred->cap_effective; 328 cap_bset = cred->cap_bset; 329 cap_ambient = cred->cap_ambient; 330 rcu_read_unlock(); 331 332 render_cap_t(m, "CapInh:\t", &cap_inheritable); 333 render_cap_t(m, "CapPrm:\t", &cap_permitted); 334 render_cap_t(m, "CapEff:\t", &cap_effective); 335 render_cap_t(m, "CapBnd:\t", &cap_bset); 336 render_cap_t(m, "CapAmb:\t", &cap_ambient); 337 } 338 339 static inline void task_seccomp(struct seq_file *m, struct task_struct *p) 340 { 341 seq_put_decimal_ull(m, "NoNewPrivs:\t", task_no_new_privs(p)); 342 #ifdef CONFIG_SECCOMP 343 seq_put_decimal_ull(m, "\nSeccomp:\t", p->seccomp.mode); 344 #endif 345 seq_puts(m, "\nSpeculation_Store_Bypass:\t"); 346 switch (arch_prctl_spec_ctrl_get(p, PR_SPEC_STORE_BYPASS)) { 347 case -EINVAL: 348 seq_puts(m, "unknown"); 349 break; 350 case PR_SPEC_NOT_AFFECTED: 351 seq_puts(m, "not vulnerable"); 352 break; 353 case PR_SPEC_PRCTL | PR_SPEC_FORCE_DISABLE: 354 seq_puts(m, "thread force mitigated"); 355 break; 356 case PR_SPEC_PRCTL | PR_SPEC_DISABLE: 357 seq_puts(m, "thread mitigated"); 358 break; 359 case PR_SPEC_PRCTL | PR_SPEC_ENABLE: 360 seq_puts(m, "thread vulnerable"); 361 break; 362 case PR_SPEC_DISABLE: 363 seq_puts(m, "globally mitigated"); 364 break; 365 default: 366 seq_puts(m, "vulnerable"); 367 break; 368 } 369 seq_putc(m, '\n'); 370 } 371 372 static inline void task_context_switch_counts(struct seq_file *m, 373 struct task_struct *p) 374 { 375 seq_put_decimal_ull(m, "voluntary_ctxt_switches:\t", p->nvcsw); 376 seq_put_decimal_ull(m, "\nnonvoluntary_ctxt_switches:\t", p->nivcsw); 377 seq_putc(m, '\n'); 378 } 379 380 static void task_cpus_allowed(struct seq_file *m, struct task_struct *task) 381 { 382 seq_printf(m, "Cpus_allowed:\t%*pb\n", 383 cpumask_pr_args(task->cpus_ptr)); 384 seq_printf(m, "Cpus_allowed_list:\t%*pbl\n", 385 cpumask_pr_args(task->cpus_ptr)); 386 } 387 388 static inline void task_core_dumping(struct seq_file *m, struct mm_struct *mm) 389 { 390 seq_put_decimal_ull(m, "CoreDumping:\t", !!mm->core_state); 391 seq_putc(m, '\n'); 392 } 393 394 static inline void task_thp_status(struct seq_file *m, struct mm_struct *mm) 395 { 396 bool thp_enabled = IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE); 397 398 if (thp_enabled) 399 thp_enabled = !test_bit(MMF_DISABLE_THP, &mm->flags); 400 seq_printf(m, "THP_enabled:\t%d\n", thp_enabled); 401 } 402 403 int proc_pid_status(struct seq_file *m, struct pid_namespace *ns, 404 struct pid *pid, struct task_struct *task) 405 { 406 struct mm_struct *mm = get_task_mm(task); 407 408 seq_puts(m, "Name:\t"); 409 proc_task_name(m, task, true); 410 seq_putc(m, '\n'); 411 412 task_state(m, ns, pid, task); 413 414 if (mm) { 415 task_mem(m, mm); 416 task_core_dumping(m, mm); 417 task_thp_status(m, mm); 418 mmput(mm); 419 } 420 task_sig(m, task); 421 task_cap(m, task); 422 task_seccomp(m, task); 423 task_cpus_allowed(m, task); 424 cpuset_task_status_allowed(m, task); 425 task_context_switch_counts(m, task); 426 return 0; 427 } 428 429 static int do_task_stat(struct seq_file *m, struct pid_namespace *ns, 430 struct pid *pid, struct task_struct *task, int whole) 431 { 432 unsigned long vsize, eip, esp, wchan = 0; 433 int priority, nice; 434 int tty_pgrp = -1, tty_nr = 0; 435 sigset_t sigign, sigcatch; 436 char state; 437 pid_t ppid = 0, pgid = -1, sid = -1; 438 int num_threads = 0; 439 int permitted; 440 struct mm_struct *mm; 441 unsigned long long start_time; 442 unsigned long cmin_flt = 0, cmaj_flt = 0; 443 unsigned long min_flt = 0, maj_flt = 0; 444 u64 cutime, cstime, utime, stime; 445 u64 cgtime, gtime; 446 unsigned long rsslim = 0; 447 unsigned long flags; 448 449 state = *get_task_state(task); 450 vsize = eip = esp = 0; 451 permitted = ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS | PTRACE_MODE_NOAUDIT); 452 mm = get_task_mm(task); 453 if (mm) { 454 vsize = task_vsize(mm); 455 /* 456 * esp and eip are intentionally zeroed out. There is no 457 * non-racy way to read them without freezing the task. 458 * Programs that need reliable values can use ptrace(2). 459 * 460 * The only exception is if the task is core dumping because 461 * a program is not able to use ptrace(2) in that case. It is 462 * safe because the task has stopped executing permanently. 463 */ 464 if (permitted && (task->flags & (PF_EXITING|PF_DUMPCORE))) { 465 if (try_get_task_stack(task)) { 466 eip = KSTK_EIP(task); 467 esp = KSTK_ESP(task); 468 put_task_stack(task); 469 } 470 } 471 } 472 473 sigemptyset(&sigign); 474 sigemptyset(&sigcatch); 475 cutime = cstime = utime = stime = 0; 476 cgtime = gtime = 0; 477 478 if (lock_task_sighand(task, &flags)) { 479 struct signal_struct *sig = task->signal; 480 481 if (sig->tty) { 482 struct pid *pgrp = tty_get_pgrp(sig->tty); 483 tty_pgrp = pid_nr_ns(pgrp, ns); 484 put_pid(pgrp); 485 tty_nr = new_encode_dev(tty_devnum(sig->tty)); 486 } 487 488 num_threads = get_nr_threads(task); 489 collect_sigign_sigcatch(task, &sigign, &sigcatch); 490 491 cmin_flt = sig->cmin_flt; 492 cmaj_flt = sig->cmaj_flt; 493 cutime = sig->cutime; 494 cstime = sig->cstime; 495 cgtime = sig->cgtime; 496 rsslim = READ_ONCE(sig->rlim[RLIMIT_RSS].rlim_cur); 497 498 /* add up live thread stats at the group level */ 499 if (whole) { 500 struct task_struct *t = task; 501 do { 502 min_flt += t->min_flt; 503 maj_flt += t->maj_flt; 504 gtime += task_gtime(t); 505 } while_each_thread(task, t); 506 507 min_flt += sig->min_flt; 508 maj_flt += sig->maj_flt; 509 thread_group_cputime_adjusted(task, &utime, &stime); 510 gtime += sig->gtime; 511 } 512 513 sid = task_session_nr_ns(task, ns); 514 ppid = task_tgid_nr_ns(task->real_parent, ns); 515 pgid = task_pgrp_nr_ns(task, ns); 516 517 unlock_task_sighand(task, &flags); 518 } 519 520 if (permitted && (!whole || num_threads < 2)) 521 wchan = get_wchan(task); 522 if (!whole) { 523 min_flt = task->min_flt; 524 maj_flt = task->maj_flt; 525 task_cputime_adjusted(task, &utime, &stime); 526 gtime = task_gtime(task); 527 } 528 529 /* scale priority and nice values from timeslices to -20..20 */ 530 /* to make it look like a "normal" Unix priority/nice value */ 531 priority = task_prio(task); 532 nice = task_nice(task); 533 534 /* convert nsec -> ticks */ 535 start_time = nsec_to_clock_t(task->start_boottime); 536 537 seq_put_decimal_ull(m, "", pid_nr_ns(pid, ns)); 538 seq_puts(m, " ("); 539 proc_task_name(m, task, false); 540 seq_puts(m, ") "); 541 seq_putc(m, state); 542 seq_put_decimal_ll(m, " ", ppid); 543 seq_put_decimal_ll(m, " ", pgid); 544 seq_put_decimal_ll(m, " ", sid); 545 seq_put_decimal_ll(m, " ", tty_nr); 546 seq_put_decimal_ll(m, " ", tty_pgrp); 547 seq_put_decimal_ull(m, " ", task->flags); 548 seq_put_decimal_ull(m, " ", min_flt); 549 seq_put_decimal_ull(m, " ", cmin_flt); 550 seq_put_decimal_ull(m, " ", maj_flt); 551 seq_put_decimal_ull(m, " ", cmaj_flt); 552 seq_put_decimal_ull(m, " ", nsec_to_clock_t(utime)); 553 seq_put_decimal_ull(m, " ", nsec_to_clock_t(stime)); 554 seq_put_decimal_ll(m, " ", nsec_to_clock_t(cutime)); 555 seq_put_decimal_ll(m, " ", nsec_to_clock_t(cstime)); 556 seq_put_decimal_ll(m, " ", priority); 557 seq_put_decimal_ll(m, " ", nice); 558 seq_put_decimal_ll(m, " ", num_threads); 559 seq_put_decimal_ull(m, " ", 0); 560 seq_put_decimal_ull(m, " ", start_time); 561 seq_put_decimal_ull(m, " ", vsize); 562 seq_put_decimal_ull(m, " ", mm ? get_mm_rss(mm) : 0); 563 seq_put_decimal_ull(m, " ", rsslim); 564 seq_put_decimal_ull(m, " ", mm ? (permitted ? mm->start_code : 1) : 0); 565 seq_put_decimal_ull(m, " ", mm ? (permitted ? mm->end_code : 1) : 0); 566 seq_put_decimal_ull(m, " ", (permitted && mm) ? mm->start_stack : 0); 567 seq_put_decimal_ull(m, " ", esp); 568 seq_put_decimal_ull(m, " ", eip); 569 /* The signal information here is obsolete. 570 * It must be decimal for Linux 2.0 compatibility. 571 * Use /proc/#/status for real-time signals. 572 */ 573 seq_put_decimal_ull(m, " ", task->pending.signal.sig[0] & 0x7fffffffUL); 574 seq_put_decimal_ull(m, " ", task->blocked.sig[0] & 0x7fffffffUL); 575 seq_put_decimal_ull(m, " ", sigign.sig[0] & 0x7fffffffUL); 576 seq_put_decimal_ull(m, " ", sigcatch.sig[0] & 0x7fffffffUL); 577 578 /* 579 * We used to output the absolute kernel address, but that's an 580 * information leak - so instead we show a 0/1 flag here, to signal 581 * to user-space whether there's a wchan field in /proc/PID/wchan. 582 * 583 * This works with older implementations of procps as well. 584 */ 585 if (wchan) 586 seq_puts(m, " 1"); 587 else 588 seq_puts(m, " 0"); 589 590 seq_put_decimal_ull(m, " ", 0); 591 seq_put_decimal_ull(m, " ", 0); 592 seq_put_decimal_ll(m, " ", task->exit_signal); 593 seq_put_decimal_ll(m, " ", task_cpu(task)); 594 seq_put_decimal_ull(m, " ", task->rt_priority); 595 seq_put_decimal_ull(m, " ", task->policy); 596 seq_put_decimal_ull(m, " ", delayacct_blkio_ticks(task)); 597 seq_put_decimal_ull(m, " ", nsec_to_clock_t(gtime)); 598 seq_put_decimal_ll(m, " ", nsec_to_clock_t(cgtime)); 599 600 if (mm && permitted) { 601 seq_put_decimal_ull(m, " ", mm->start_data); 602 seq_put_decimal_ull(m, " ", mm->end_data); 603 seq_put_decimal_ull(m, " ", mm->start_brk); 604 seq_put_decimal_ull(m, " ", mm->arg_start); 605 seq_put_decimal_ull(m, " ", mm->arg_end); 606 seq_put_decimal_ull(m, " ", mm->env_start); 607 seq_put_decimal_ull(m, " ", mm->env_end); 608 } else 609 seq_puts(m, " 0 0 0 0 0 0 0"); 610 611 if (permitted) 612 seq_put_decimal_ll(m, " ", task->exit_code); 613 else 614 seq_puts(m, " 0"); 615 616 seq_putc(m, '\n'); 617 if (mm) 618 mmput(mm); 619 return 0; 620 } 621 622 int proc_tid_stat(struct seq_file *m, struct pid_namespace *ns, 623 struct pid *pid, struct task_struct *task) 624 { 625 return do_task_stat(m, ns, pid, task, 0); 626 } 627 628 int proc_tgid_stat(struct seq_file *m, struct pid_namespace *ns, 629 struct pid *pid, struct task_struct *task) 630 { 631 return do_task_stat(m, ns, pid, task, 1); 632 } 633 634 int proc_pid_statm(struct seq_file *m, struct pid_namespace *ns, 635 struct pid *pid, struct task_struct *task) 636 { 637 struct mm_struct *mm = get_task_mm(task); 638 639 if (mm) { 640 unsigned long size; 641 unsigned long resident = 0; 642 unsigned long shared = 0; 643 unsigned long text = 0; 644 unsigned long data = 0; 645 646 size = task_statm(mm, &shared, &text, &data, &resident); 647 mmput(mm); 648 649 /* 650 * For quick read, open code by putting numbers directly 651 * expected format is 652 * seq_printf(m, "%lu %lu %lu %lu 0 %lu 0\n", 653 * size, resident, shared, text, data); 654 */ 655 seq_put_decimal_ull(m, "", size); 656 seq_put_decimal_ull(m, " ", resident); 657 seq_put_decimal_ull(m, " ", shared); 658 seq_put_decimal_ull(m, " ", text); 659 seq_put_decimal_ull(m, " ", 0); 660 seq_put_decimal_ull(m, " ", data); 661 seq_put_decimal_ull(m, " ", 0); 662 seq_putc(m, '\n'); 663 } else { 664 seq_write(m, "0 0 0 0 0 0 0\n", 14); 665 } 666 return 0; 667 } 668 669 #ifdef CONFIG_PROC_CHILDREN 670 static struct pid * 671 get_children_pid(struct inode *inode, struct pid *pid_prev, loff_t pos) 672 { 673 struct task_struct *start, *task; 674 struct pid *pid = NULL; 675 676 read_lock(&tasklist_lock); 677 678 start = pid_task(proc_pid(inode), PIDTYPE_PID); 679 if (!start) 680 goto out; 681 682 /* 683 * Lets try to continue searching first, this gives 684 * us significant speedup on children-rich processes. 685 */ 686 if (pid_prev) { 687 task = pid_task(pid_prev, PIDTYPE_PID); 688 if (task && task->real_parent == start && 689 !(list_empty(&task->sibling))) { 690 if (list_is_last(&task->sibling, &start->children)) 691 goto out; 692 task = list_first_entry(&task->sibling, 693 struct task_struct, sibling); 694 pid = get_pid(task_pid(task)); 695 goto out; 696 } 697 } 698 699 /* 700 * Slow search case. 701 * 702 * We might miss some children here if children 703 * are exited while we were not holding the lock, 704 * but it was never promised to be accurate that 705 * much. 706 * 707 * "Just suppose that the parent sleeps, but N children 708 * exit after we printed their tids. Now the slow paths 709 * skips N extra children, we miss N tasks." (c) 710 * 711 * So one need to stop or freeze the leader and all 712 * its children to get a precise result. 713 */ 714 list_for_each_entry(task, &start->children, sibling) { 715 if (pos-- == 0) { 716 pid = get_pid(task_pid(task)); 717 break; 718 } 719 } 720 721 out: 722 read_unlock(&tasklist_lock); 723 return pid; 724 } 725 726 static int children_seq_show(struct seq_file *seq, void *v) 727 { 728 struct inode *inode = file_inode(seq->file); 729 730 seq_printf(seq, "%d ", pid_nr_ns(v, proc_pid_ns(inode->i_sb))); 731 return 0; 732 } 733 734 static void *children_seq_start(struct seq_file *seq, loff_t *pos) 735 { 736 return get_children_pid(file_inode(seq->file), NULL, *pos); 737 } 738 739 static void *children_seq_next(struct seq_file *seq, void *v, loff_t *pos) 740 { 741 struct pid *pid; 742 743 pid = get_children_pid(file_inode(seq->file), v, *pos + 1); 744 put_pid(v); 745 746 ++*pos; 747 return pid; 748 } 749 750 static void children_seq_stop(struct seq_file *seq, void *v) 751 { 752 put_pid(v); 753 } 754 755 static const struct seq_operations children_seq_ops = { 756 .start = children_seq_start, 757 .next = children_seq_next, 758 .stop = children_seq_stop, 759 .show = children_seq_show, 760 }; 761 762 static int children_seq_open(struct inode *inode, struct file *file) 763 { 764 return seq_open(file, &children_seq_ops); 765 } 766 767 const struct file_operations proc_tid_children_operations = { 768 .open = children_seq_open, 769 .read = seq_read, 770 .llseek = seq_lseek, 771 .release = seq_release, 772 }; 773 #endif /* CONFIG_PROC_CHILDREN */ 774