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1// SPDX-License-Identifier: GPL-2.02/*3 * linux/fs/proc/array.c4 *5 * Copyright (C) 1992 by Linus Torvalds6 * based on ideas by Darren Senn7 *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, to13 * make sure SET_PROCTITLE works. Also removed14 * bad '!' which forced address recalculation for15 * EVERY character on the current page.16 * <middelin@polyware.iaf.nl>17 *18 * Danny ter Haar : added cpuinfo19 * <dth@cistron.nl>20 *21 * Alessandro Rubini : profile extension.22 * <rubini@ipvvis.unipv.it>23 *24 * Jeff Tranter : added BogoMips field to cpuinfo25 * <Jeff_Tranter@Mitel.COM>26 *27 * Bruno Haible : remove 4K limit for the maps file28 * <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/stat34 * and /proc/<pid>/cpu extension35 * <forissier@isia.cma.fr>36 * - Incorporation and non-SMP safe operation37 * of forissier patch in 2.1.78 by38 * Hans Marcus <crowbar@concepts.nl>39 *40 * aeb@cwi.nl : /proc/partitions41 *42 *43 * Alan Cox : security fixes.44 * <alan@lxorguk.ukuu.org.uk>45 *46 * Al Viro : safe handling of mm_struct47 *48 * Gerhard Wichert : added BIGMEM support49 * Siemens AG <Gerhard.Wichert@pdb.siemens.de>50 *51 * Al Viro & Jeff Garzik : moved most of the thing into base.c and52 * : proc_misc.c. The rest may eventually go into53 * : base.c too.54 */55 56#include <linux/types.h>57#include <linux/errno.h>58#include <linux/time.h>59#include <linux/time_namespace.h>60#include <linux/kernel.h>61#include <linux/kernel_stat.h>62#include <linux/tty.h>63#include <linux/string.h>64#include <linux/mman.h>65#include <linux/sched/mm.h>66#include <linux/sched/numa_balancing.h>67#include <linux/sched/task_stack.h>68#include <linux/sched/task.h>69#include <linux/sched/cputime.h>70#include <linux/proc_fs.h>71#include <linux/ioport.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/string_helpers.h>91#include <linux/user_namespace.h>92#include <linux/fs_struct.h>93#include <linux/kthread.h>94#include <linux/mmu_context.h>95 96#include <asm/processor.h>97#include "internal.h"98 99void proc_task_name(struct seq_file *m, struct task_struct *p, bool escape)100{101 char tcomm[64];102 103 /*104 * Test before PF_KTHREAD because all workqueue worker threads are105 * kernel threads.106 */107 if (p->flags & PF_WQ_WORKER)108 wq_worker_comm(tcomm, sizeof(tcomm), p);109 else if (p->flags & PF_KTHREAD)110 get_kthread_comm(tcomm, sizeof(tcomm), p);111 else112 __get_task_comm(tcomm, sizeof(tcomm), p);113 114 if (escape)115 seq_escape_str(m, tcomm, ESCAPE_SPACE | ESCAPE_SPECIAL, "\n\\");116 else117 seq_printf(m, "%.64s", tcomm);118}119 120/*121 * The task state array is a strange "bitmap" of122 * reasons to sleep. Thus "running" is zero, and123 * you can test for combinations of others with124 * simple bit tests.125 */126static const char * const task_state_array[] = {127 128 /* states in TASK_REPORT: */129 "R (running)", /* 0x00 */130 "S (sleeping)", /* 0x01 */131 "D (disk sleep)", /* 0x02 */132 "T (stopped)", /* 0x04 */133 "t (tracing stop)", /* 0x08 */134 "X (dead)", /* 0x10 */135 "Z (zombie)", /* 0x20 */136 "P (parked)", /* 0x40 */137 138 /* states beyond TASK_REPORT: */139 "I (idle)", /* 0x80 */140};141 142static inline const char *get_task_state(struct task_struct *tsk)143{144 BUILD_BUG_ON(1 + ilog2(TASK_REPORT_MAX) != ARRAY_SIZE(task_state_array));145 return task_state_array[task_state_index(tsk)];146}147 148static inline void task_state(struct seq_file *m, struct pid_namespace *ns,149 struct pid *pid, struct task_struct *p)150{151 struct user_namespace *user_ns = seq_user_ns(m);152 struct group_info *group_info;153 int g, umask = -1;154 struct task_struct *tracer;155 const struct cred *cred;156 pid_t ppid, tpid = 0, tgid, ngid;157 unsigned int max_fds = 0;158 159 rcu_read_lock();160 ppid = pid_alive(p) ?161 task_tgid_nr_ns(rcu_dereference(p->real_parent), ns) : 0;162 163 tracer = ptrace_parent(p);164 if (tracer)165 tpid = task_pid_nr_ns(tracer, ns);166 167 tgid = task_tgid_nr_ns(p, ns);168 ngid = task_numa_group_id(p);169 cred = get_task_cred(p);170 171 task_lock(p);172 if (p->fs)173 umask = p->fs->umask;174 if (p->files)175 max_fds = files_fdtable(p->files)->max_fds;176 task_unlock(p);177 rcu_read_unlock();178 179 if (umask >= 0)180 seq_printf(m, "Umask:\t%#04o\n", umask);181 seq_puts(m, "State:\t");182 seq_puts(m, get_task_state(p));183 184 seq_put_decimal_ull(m, "\nTgid:\t", tgid);185 seq_put_decimal_ull(m, "\nNgid:\t", ngid);186 seq_put_decimal_ull(m, "\nPid:\t", pid_nr_ns(pid, ns));187 seq_put_decimal_ull(m, "\nPPid:\t", ppid);188 seq_put_decimal_ull(m, "\nTracerPid:\t", tpid);189 seq_put_decimal_ull(m, "\nUid:\t", from_kuid_munged(user_ns, cred->uid));190 seq_put_decimal_ull(m, "\t", from_kuid_munged(user_ns, cred->euid));191 seq_put_decimal_ull(m, "\t", from_kuid_munged(user_ns, cred->suid));192 seq_put_decimal_ull(m, "\t", from_kuid_munged(user_ns, cred->fsuid));193 seq_put_decimal_ull(m, "\nGid:\t", from_kgid_munged(user_ns, cred->gid));194 seq_put_decimal_ull(m, "\t", from_kgid_munged(user_ns, cred->egid));195 seq_put_decimal_ull(m, "\t", from_kgid_munged(user_ns, cred->sgid));196 seq_put_decimal_ull(m, "\t", from_kgid_munged(user_ns, cred->fsgid));197 seq_put_decimal_ull(m, "\nFDSize:\t", max_fds);198 199 seq_puts(m, "\nGroups:\t");200 group_info = cred->group_info;201 for (g = 0; g < group_info->ngroups; g++)202 seq_put_decimal_ull(m, g ? " " : "",203 from_kgid_munged(user_ns, group_info->gid[g]));204 put_cred(cred);205 /* Trailing space shouldn't have been added in the first place. */206 seq_putc(m, ' ');207 208#ifdef CONFIG_PID_NS209 seq_puts(m, "\nNStgid:");210 for (g = ns->level; g <= pid->level; g++)211 seq_put_decimal_ull(m, "\t", task_tgid_nr_ns(p, pid->numbers[g].ns));212 seq_puts(m, "\nNSpid:");213 for (g = ns->level; g <= pid->level; g++)214 seq_put_decimal_ull(m, "\t", task_pid_nr_ns(p, pid->numbers[g].ns));215 seq_puts(m, "\nNSpgid:");216 for (g = ns->level; g <= pid->level; g++)217 seq_put_decimal_ull(m, "\t", task_pgrp_nr_ns(p, pid->numbers[g].ns));218 seq_puts(m, "\nNSsid:");219 for (g = ns->level; g <= pid->level; g++)220 seq_put_decimal_ull(m, "\t", task_session_nr_ns(p, pid->numbers[g].ns));221#endif222 seq_putc(m, '\n');223 224 seq_printf(m, "Kthread:\t%c\n", p->flags & PF_KTHREAD ? '1' : '0');225}226 227void render_sigset_t(struct seq_file *m, const char *header,228 sigset_t *set)229{230 int i;231 232 seq_puts(m, header);233 234 i = _NSIG;235 do {236 int x = 0;237 238 i -= 4;239 if (sigismember(set, i+1)) x |= 1;240 if (sigismember(set, i+2)) x |= 2;241 if (sigismember(set, i+3)) x |= 4;242 if (sigismember(set, i+4)) x |= 8;243 seq_putc(m, hex_asc[x]);244 } while (i >= 4);245 246 seq_putc(m, '\n');247}248 249static void collect_sigign_sigcatch(struct task_struct *p, sigset_t *sigign,250 sigset_t *sigcatch)251{252 struct k_sigaction *k;253 int i;254 255 k = p->sighand->action;256 for (i = 1; i <= _NSIG; ++i, ++k) {257 if (k->sa.sa_handler == SIG_IGN)258 sigaddset(sigign, i);259 else if (k->sa.sa_handler != SIG_DFL)260 sigaddset(sigcatch, i);261 }262}263 264static inline void task_sig(struct seq_file *m, struct task_struct *p)265{266 unsigned long flags;267 sigset_t pending, shpending, blocked, ignored, caught;268 int num_threads = 0;269 unsigned int qsize = 0;270 unsigned long qlim = 0;271 272 sigemptyset(&pending);273 sigemptyset(&shpending);274 sigemptyset(&blocked);275 sigemptyset(&ignored);276 sigemptyset(&caught);277 278 if (lock_task_sighand(p, &flags)) {279 pending = p->pending.signal;280 shpending = p->signal->shared_pending.signal;281 blocked = p->blocked;282 collect_sigign_sigcatch(p, &ignored, &caught);283 num_threads = get_nr_threads(p);284 rcu_read_lock(); /* FIXME: is this correct? */285 qsize = get_rlimit_value(task_ucounts(p), UCOUNT_RLIMIT_SIGPENDING);286 rcu_read_unlock();287 qlim = task_rlimit(p, RLIMIT_SIGPENDING);288 unlock_task_sighand(p, &flags);289 }290 291 seq_put_decimal_ull(m, "Threads:\t", num_threads);292 seq_put_decimal_ull(m, "\nSigQ:\t", qsize);293 seq_put_decimal_ull(m, "/", qlim);294 295 /* render them all */296 render_sigset_t(m, "\nSigPnd:\t", &pending);297 render_sigset_t(m, "ShdPnd:\t", &shpending);298 render_sigset_t(m, "SigBlk:\t", &blocked);299 render_sigset_t(m, "SigIgn:\t", &ignored);300 render_sigset_t(m, "SigCgt:\t", &caught);301}302 303static void render_cap_t(struct seq_file *m, const char *header,304 kernel_cap_t *a)305{306 seq_puts(m, header);307 seq_put_hex_ll(m, NULL, a->val, 16);308 seq_putc(m, '\n');309}310 311static inline void task_cap(struct seq_file *m, struct task_struct *p)312{313 const struct cred *cred;314 kernel_cap_t cap_inheritable, cap_permitted, cap_effective,315 cap_bset, cap_ambient;316 317 rcu_read_lock();318 cred = __task_cred(p);319 cap_inheritable = cred->cap_inheritable;320 cap_permitted = cred->cap_permitted;321 cap_effective = cred->cap_effective;322 cap_bset = cred->cap_bset;323 cap_ambient = cred->cap_ambient;324 rcu_read_unlock();325 326 render_cap_t(m, "CapInh:\t", &cap_inheritable);327 render_cap_t(m, "CapPrm:\t", &cap_permitted);328 render_cap_t(m, "CapEff:\t", &cap_effective);329 render_cap_t(m, "CapBnd:\t", &cap_bset);330 render_cap_t(m, "CapAmb:\t", &cap_ambient);331}332 333static inline void task_seccomp(struct seq_file *m, struct task_struct *p)334{335 seq_put_decimal_ull(m, "NoNewPrivs:\t", task_no_new_privs(p));336#ifdef CONFIG_SECCOMP337 seq_put_decimal_ull(m, "\nSeccomp:\t", p->seccomp.mode);338#ifdef CONFIG_SECCOMP_FILTER339 seq_put_decimal_ull(m, "\nSeccomp_filters:\t",340 atomic_read(&p->seccomp.filter_count));341#endif342#endif343 seq_puts(m, "\nSpeculation_Store_Bypass:\t");344 switch (arch_prctl_spec_ctrl_get(p, PR_SPEC_STORE_BYPASS)) {345 case -EINVAL:346 seq_puts(m, "unknown");347 break;348 case PR_SPEC_NOT_AFFECTED:349 seq_puts(m, "not vulnerable");350 break;351 case PR_SPEC_PRCTL | PR_SPEC_FORCE_DISABLE:352 seq_puts(m, "thread force mitigated");353 break;354 case PR_SPEC_PRCTL | PR_SPEC_DISABLE:355 seq_puts(m, "thread mitigated");356 break;357 case PR_SPEC_PRCTL | PR_SPEC_ENABLE:358 seq_puts(m, "thread vulnerable");359 break;360 case PR_SPEC_DISABLE:361 seq_puts(m, "globally mitigated");362 break;363 default:364 seq_puts(m, "vulnerable");365 break;366 }367 368 seq_puts(m, "\nSpeculationIndirectBranch:\t");369 switch (arch_prctl_spec_ctrl_get(p, PR_SPEC_INDIRECT_BRANCH)) {370 case -EINVAL:371 seq_puts(m, "unsupported");372 break;373 case PR_SPEC_NOT_AFFECTED:374 seq_puts(m, "not affected");375 break;376 case PR_SPEC_PRCTL | PR_SPEC_FORCE_DISABLE:377 seq_puts(m, "conditional force disabled");378 break;379 case PR_SPEC_PRCTL | PR_SPEC_DISABLE:380 seq_puts(m, "conditional disabled");381 break;382 case PR_SPEC_PRCTL | PR_SPEC_ENABLE:383 seq_puts(m, "conditional enabled");384 break;385 case PR_SPEC_ENABLE:386 seq_puts(m, "always enabled");387 break;388 case PR_SPEC_DISABLE:389 seq_puts(m, "always disabled");390 break;391 default:392 seq_puts(m, "unknown");393 break;394 }395 seq_putc(m, '\n');396}397 398static inline void task_context_switch_counts(struct seq_file *m,399 struct task_struct *p)400{401 seq_put_decimal_ull(m, "voluntary_ctxt_switches:\t", p->nvcsw);402 seq_put_decimal_ull(m, "\nnonvoluntary_ctxt_switches:\t", p->nivcsw);403 seq_putc(m, '\n');404}405 406static void task_cpus_allowed(struct seq_file *m, struct task_struct *task)407{408 seq_printf(m, "Cpus_allowed:\t%*pb\n",409 cpumask_pr_args(&task->cpus_mask));410 seq_printf(m, "Cpus_allowed_list:\t%*pbl\n",411 cpumask_pr_args(&task->cpus_mask));412}413 414static inline void task_core_dumping(struct seq_file *m, struct task_struct *task)415{416 seq_put_decimal_ull(m, "CoreDumping:\t", !!task->signal->core_state);417 seq_putc(m, '\n');418}419 420static inline void task_thp_status(struct seq_file *m, struct mm_struct *mm)421{422 bool thp_enabled = IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE);423 424 if (thp_enabled)425 thp_enabled = !test_bit(MMF_DISABLE_THP, &mm->flags);426 seq_printf(m, "THP_enabled:\t%d\n", thp_enabled);427}428 429static inline void task_untag_mask(struct seq_file *m, struct mm_struct *mm)430{431 seq_printf(m, "untag_mask:\t%#lx\n", mm_untag_mask(mm));432}433 434__weak void arch_proc_pid_thread_features(struct seq_file *m,435 struct task_struct *task)436{437}438 439int proc_pid_status(struct seq_file *m, struct pid_namespace *ns,440 struct pid *pid, struct task_struct *task)441{442 struct mm_struct *mm = get_task_mm(task);443 444 seq_puts(m, "Name:\t");445 proc_task_name(m, task, true);446 seq_putc(m, '\n');447 448 task_state(m, ns, pid, task);449 450 if (mm) {451 task_mem(m, mm);452 task_core_dumping(m, task);453 task_thp_status(m, mm);454 task_untag_mask(m, mm);455 mmput(mm);456 }457 task_sig(m, task);458 task_cap(m, task);459 task_seccomp(m, task);460 task_cpus_allowed(m, task);461 cpuset_task_status_allowed(m, task);462 task_context_switch_counts(m, task);463 arch_proc_pid_thread_features(m, task);464 return 0;465}466 467static HWJS_SUSPENDS int do_task_stat(struct seq_file *m, struct pid_namespace *ns,468 struct pid *pid, struct task_struct *task, int whole)469{470 unsigned long vsize, eip, esp, wchan = 0;471 int priority, nice;472 int tty_pgrp = -1, tty_nr = 0;473 sigset_t sigign, sigcatch;474 char state;475 pid_t ppid = 0, pgid = -1, sid = -1;476 int num_threads = 0;477 int permitted;478 struct mm_struct *mm;479 unsigned long long start_time;480 unsigned long cmin_flt, cmaj_flt, min_flt, maj_flt;481 u64 cutime, cstime, cgtime, utime, stime, gtime;482 unsigned long rsslim = 0;483 unsigned long flags;484 int exit_code = task->exit_code;485 struct signal_struct *sig = task->signal;486 unsigned int seq = 1;487 488 state = *get_task_state(task);489 vsize = eip = esp = 0;490 permitted = ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS | PTRACE_MODE_NOAUDIT);491 mm = get_task_mm(task);492 if (mm) {493 vsize = task_vsize(mm);494 /*495 * esp and eip are intentionally zeroed out. There is no496 * non-racy way to read them without freezing the task.497 * Programs that need reliable values can use ptrace(2).498 *499 * The only exception is if the task is core dumping because500 * a program is not able to use ptrace(2) in that case. It is501 * safe because the task has stopped executing permanently.502 */503 if (permitted && (task->flags & (PF_EXITING|PF_DUMPCORE))) {504 if (try_get_task_stack(task)) {505 eip = KSTK_EIP(task);506 esp = KSTK_ESP(task);507 put_task_stack(task);508 }509 }510 }511 512 sigemptyset(&sigign);513 sigemptyset(&sigcatch);514 515 if (lock_task_sighand(task, &flags)) {516 if (sig->tty) {517 struct pid *pgrp = tty_get_pgrp(sig->tty);518 tty_pgrp = pid_nr_ns(pgrp, ns);519 put_pid(pgrp);520 tty_nr = new_encode_dev(tty_devnum(sig->tty));521 }522 523 num_threads = get_nr_threads(task);524 collect_sigign_sigcatch(task, &sigign, &sigcatch);525 526 rsslim = READ_ONCE(sig->rlim[RLIMIT_RSS].rlim_cur);527 528 if (whole) {529 if (sig->flags & (SIGNAL_GROUP_EXIT | SIGNAL_STOP_STOPPED))530 exit_code = sig->group_exit_code;531 }532 533 sid = task_session_nr_ns(task, ns);534 ppid = task_tgid_nr_ns(task->real_parent, ns);535 pgid = task_pgrp_nr_ns(task, ns);536 537 unlock_task_sighand(task, &flags);538 }539 540 if (permitted && (!whole || num_threads < 2))541 wchan = !task_is_running(task);542 543 do {544 seq++; /* 2 on the 1st/lockless path, otherwise odd */545 flags = read_seqbegin_or_lock_irqsave(&sig->stats_lock, &seq);546 547 cmin_flt = sig->cmin_flt;548 cmaj_flt = sig->cmaj_flt;549 cutime = sig->cutime;550 cstime = sig->cstime;551 cgtime = sig->cgtime;552 553 if (whole) {554 struct task_struct *t;555 556 min_flt = sig->min_flt;557 maj_flt = sig->maj_flt;558 gtime = sig->gtime;559 560 rcu_read_lock();561 __for_each_thread(sig, t) {562 min_flt += t->min_flt;563 maj_flt += t->maj_flt;564 gtime += task_gtime(t);565 }566 rcu_read_unlock();567 }568 } while (need_seqretry(&sig->stats_lock, seq));569 done_seqretry_irqrestore(&sig->stats_lock, seq, flags);570 571 if (whole) {572 thread_group_cputime_adjusted(task, &utime, &stime);573 } else {574 task_cputime_adjusted(task, &utime, &stime);575 min_flt = task->min_flt;576 maj_flt = task->maj_flt;577 gtime = task_gtime(task);578 }579 580 /* scale priority and nice values from timeslices to -20..20 */581 /* to make it look like a "normal" Unix priority/nice value */582 priority = task_prio(task);583 nice = task_nice(task);584 585 /* apply timens offset for boottime and convert nsec -> ticks */586 start_time =587 nsec_to_clock_t(timens_add_boottime_ns(task->start_boottime));588 589 seq_put_decimal_ull(m, "", pid_nr_ns(pid, ns));590 seq_puts(m, " (");591 proc_task_name(m, task, false);592 seq_puts(m, ") ");593 seq_putc(m, state);594 seq_put_decimal_ll(m, " ", ppid);595 seq_put_decimal_ll(m, " ", pgid);596 seq_put_decimal_ll(m, " ", sid);597 seq_put_decimal_ll(m, " ", tty_nr);598 seq_put_decimal_ll(m, " ", tty_pgrp);599 seq_put_decimal_ull(m, " ", task->flags);600 seq_put_decimal_ull(m, " ", min_flt);601 seq_put_decimal_ull(m, " ", cmin_flt);602 seq_put_decimal_ull(m, " ", maj_flt);603 seq_put_decimal_ull(m, " ", cmaj_flt);604 seq_put_decimal_ull(m, " ", nsec_to_clock_t(utime));605 seq_put_decimal_ull(m, " ", nsec_to_clock_t(stime));606 seq_put_decimal_ll(m, " ", nsec_to_clock_t(cutime));607 seq_put_decimal_ll(m, " ", nsec_to_clock_t(cstime));608 seq_put_decimal_ll(m, " ", priority);609 seq_put_decimal_ll(m, " ", nice);610 seq_put_decimal_ll(m, " ", num_threads);611 seq_put_decimal_ull(m, " ", 0);612 seq_put_decimal_ull(m, " ", start_time);613 seq_put_decimal_ull(m, " ", vsize);614 seq_put_decimal_ull(m, " ", mm ? get_mm_rss(mm) : 0);615 seq_put_decimal_ull(m, " ", rsslim);616 seq_put_decimal_ull(m, " ", mm ? (permitted ? mm->start_code : 1) : 0);617 seq_put_decimal_ull(m, " ", mm ? (permitted ? mm->end_code : 1) : 0);618 seq_put_decimal_ull(m, " ", (permitted && mm) ? mm->start_stack : 0);619 seq_put_decimal_ull(m, " ", esp);620 seq_put_decimal_ull(m, " ", eip);621 /* The signal information here is obsolete.622 * It must be decimal for Linux 2.0 compatibility.623 * Use /proc/#/status for real-time signals.624 */625 seq_put_decimal_ull(m, " ", task->pending.signal.sig[0] & 0x7fffffffUL);626 seq_put_decimal_ull(m, " ", task->blocked.sig[0] & 0x7fffffffUL);627 seq_put_decimal_ull(m, " ", sigign.sig[0] & 0x7fffffffUL);628 seq_put_decimal_ull(m, " ", sigcatch.sig[0] & 0x7fffffffUL);629 630 /*631 * We used to output the absolute kernel address, but that's an632 * information leak - so instead we show a 0/1 flag here, to signal633 * to user-space whether there's a wchan field in /proc/PID/wchan.634 *635 * This works with older implementations of procps as well.636 */637 seq_put_decimal_ull(m, " ", wchan);638 639 seq_put_decimal_ull(m, " ", 0);640 seq_put_decimal_ull(m, " ", 0);641 seq_put_decimal_ll(m, " ", task->exit_signal);642 seq_put_decimal_ll(m, " ", task_cpu(task));643 seq_put_decimal_ull(m, " ", task->rt_priority);644 seq_put_decimal_ull(m, " ", task->policy);645 seq_put_decimal_ull(m, " ", delayacct_blkio_ticks(task));646 seq_put_decimal_ull(m, " ", nsec_to_clock_t(gtime));647 seq_put_decimal_ll(m, " ", nsec_to_clock_t(cgtime));648 649 if (mm && permitted) {650 seq_put_decimal_ull(m, " ", mm->start_data);651 seq_put_decimal_ull(m, " ", mm->end_data);652 seq_put_decimal_ull(m, " ", mm->start_brk);653 seq_put_decimal_ull(m, " ", mm->arg_start);654 seq_put_decimal_ull(m, " ", mm->arg_end);655 seq_put_decimal_ull(m, " ", mm->env_start);656 seq_put_decimal_ull(m, " ", mm->env_end);657 } else658 seq_puts(m, " 0 0 0 0 0 0 0");659 660 if (permitted)661 seq_put_decimal_ll(m, " ", exit_code);662 else663 seq_puts(m, " 0");664 665 seq_putc(m, '\n');666 if (mm)667 mmput(mm);668 return 0;669}670 671int proc_tid_stat(struct seq_file *m, struct pid_namespace *ns,672 struct pid *pid, struct task_struct *task)673{674 return do_task_stat(m, ns, pid, task, 0);675}676 677int proc_tgid_stat(struct seq_file *m, struct pid_namespace *ns,678 struct pid *pid, struct task_struct *task)679{680 return do_task_stat(m, ns, pid, task, 1);681}682 683int proc_pid_statm(struct seq_file *m, struct pid_namespace *ns,684 struct pid *pid, struct task_struct *task)685{686 struct mm_struct *mm = get_task_mm(task);687 688 if (mm) {689 unsigned long size;690 unsigned long resident = 0;691 unsigned long shared = 0;692 unsigned long text = 0;693 unsigned long data = 0;694 695 size = task_statm(mm, &shared, &text, &data, &resident);696 mmput(mm);697 698 /*699 * For quick read, open code by putting numbers directly700 * expected format is701 * seq_printf(m, "%lu %lu %lu %lu 0 %lu 0\n",702 * size, resident, shared, text, data);703 */704 seq_put_decimal_ull(m, "", size);705 seq_put_decimal_ull(m, " ", resident);706 seq_put_decimal_ull(m, " ", shared);707 seq_put_decimal_ull(m, " ", text);708 seq_put_decimal_ull(m, " ", 0);709 seq_put_decimal_ull(m, " ", data);710 seq_put_decimal_ull(m, " ", 0);711 seq_putc(m, '\n');712 } else {713 seq_write(m, "0 0 0 0 0 0 0\n", 14);714 }715 return 0;716}717 718#ifdef CONFIG_PROC_CHILDREN719static struct pid *720get_children_pid(struct inode *inode, struct pid *pid_prev, loff_t pos)721{722 struct task_struct *start, *task;723 struct pid *pid = NULL;724 725 read_lock(&tasklist_lock);726 727 start = pid_task(proc_pid(inode), PIDTYPE_PID);728 if (!start)729 goto out;730 731 /*732 * Lets try to continue searching first, this gives733 * us significant speedup on children-rich processes.734 */735 if (pid_prev) {736 task = pid_task(pid_prev, PIDTYPE_PID);737 if (task && task->real_parent == start &&738 !(list_empty(&task->sibling))) {739 if (list_is_last(&task->sibling, &start->children))740 goto out;741 task = list_first_entry(&task->sibling,742 struct task_struct, sibling);743 pid = get_pid(task_pid(task));744 goto out;745 }746 }747 748 /*749 * Slow search case.750 *751 * We might miss some children here if children752 * are exited while we were not holding the lock,753 * but it was never promised to be accurate that754 * much.755 *756 * "Just suppose that the parent sleeps, but N children757 * exit after we printed their tids. Now the slow paths758 * skips N extra children, we miss N tasks." (c)759 *760 * So one need to stop or freeze the leader and all761 * its children to get a precise result.762 */763 list_for_each_entry(task, &start->children, sibling) {764 if (pos-- == 0) {765 pid = get_pid(task_pid(task));766 break;767 }768 }769 770out:771 read_unlock(&tasklist_lock);772 return pid;773}774 775static int children_seq_show(struct seq_file *seq, void *v)776{777 struct inode *inode = file_inode(seq->file);778 779 seq_printf(seq, "%d ", pid_nr_ns(v, proc_pid_ns(inode->i_sb)));780 return 0;781}782 783static void *children_seq_start(struct seq_file *seq, loff_t *pos)784{785 return get_children_pid(file_inode(seq->file), NULL, *pos);786}787 788static void *children_seq_next(struct seq_file *seq, void *v, loff_t *pos)789{790 struct pid *pid;791 792 pid = get_children_pid(file_inode(seq->file), v, *pos + 1);793 put_pid(v);794 795 ++*pos;796 return pid;797}798 799static void children_seq_stop(struct seq_file *seq, void *v)800{801 put_pid(v);802}803 804static const struct seq_operations children_seq_ops = {805 .start = children_seq_start,806 .next = children_seq_next,807 .stop = children_seq_stop,808 .show = children_seq_show,809};810 811static int children_seq_open(struct inode *inode, struct file *file)812{813 return seq_open(file, &children_seq_ops);814}815 816const struct file_operations proc_tid_children_operations = {817 .open = children_seq_open,818 .read = seq_read,819 .llseek = seq_lseek,820 .release = seq_release,821};822#endif /* CONFIG_PROC_CHILDREN */823