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TOMOYO Linux Cross Reference
Linux/fs/proc/array.c

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  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_puts(m, "\nSpeculation_Store_Bypass:\t");
347         switch (arch_prctl_spec_ctrl_get(p, PR_SPEC_STORE_BYPASS)) {
348         case -EINVAL:
349                 seq_puts(m, "unknown");
350                 break;
351         case PR_SPEC_NOT_AFFECTED:
352                 seq_puts(m, "not vulnerable");
353                 break;
354         case PR_SPEC_PRCTL | PR_SPEC_FORCE_DISABLE:
355                 seq_puts(m, "thread force mitigated");
356                 break;
357         case PR_SPEC_PRCTL | PR_SPEC_DISABLE:
358                 seq_puts(m, "thread mitigated");
359                 break;
360         case PR_SPEC_PRCTL | PR_SPEC_ENABLE:
361                 seq_puts(m, "thread vulnerable");
362                 break;
363         case PR_SPEC_DISABLE:
364                 seq_puts(m, "globally mitigated");
365                 break;
366         default:
367                 seq_puts(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 static inline void task_thp_status(struct seq_file *m, struct mm_struct *mm)
396 {
397         bool thp_enabled = IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE);
398 
399         if (thp_enabled)
400                 thp_enabled = !test_bit(MMF_DISABLE_THP, &mm->flags);
401         seq_printf(m, "THP_enabled:\t%d\n", thp_enabled);
402 }
403 
404 int proc_pid_status(struct seq_file *m, struct pid_namespace *ns,
405                         struct pid *pid, struct task_struct *task)
406 {
407         struct mm_struct *mm = get_task_mm(task);
408 
409         seq_puts(m, "Name:\t");
410         proc_task_name(m, task, true);
411         seq_putc(m, '\n');
412 
413         task_state(m, ns, pid, task);
414 
415         if (mm) {
416                 task_mem(m, mm);
417                 task_core_dumping(m, mm);
418                 task_thp_status(m, mm);
419                 mmput(mm);
420         }
421         task_sig(m, task);
422         task_cap(m, task);
423         task_seccomp(m, task);
424         task_cpus_allowed(m, task);
425         cpuset_task_status_allowed(m, task);
426         task_context_switch_counts(m, task);
427         return 0;
428 }
429 
430 static int do_task_stat(struct seq_file *m, struct pid_namespace *ns,
431                         struct pid *pid, struct task_struct *task, int whole)
432 {
433         unsigned long vsize, eip, esp, wchan = 0;
434         int priority, nice;
435         int tty_pgrp = -1, tty_nr = 0;
436         sigset_t sigign, sigcatch;
437         char state;
438         pid_t ppid = 0, pgid = -1, sid = -1;
439         int num_threads = 0;
440         int permitted;
441         struct mm_struct *mm;
442         unsigned long long start_time;
443         unsigned long cmin_flt = 0, cmaj_flt = 0;
444         unsigned long  min_flt = 0,  maj_flt = 0;
445         u64 cutime, cstime, utime, stime;
446         u64 cgtime, gtime;
447         unsigned long rsslim = 0;
448         unsigned long flags;
449 
450         state = *get_task_state(task);
451         vsize = eip = esp = 0;
452         permitted = ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS | PTRACE_MODE_NOAUDIT);
453         mm = get_task_mm(task);
454         if (mm) {
455                 vsize = task_vsize(mm);
456                 /*
457                  * esp and eip are intentionally zeroed out.  There is no
458                  * non-racy way to read them without freezing the task.
459                  * Programs that need reliable values can use ptrace(2).
460                  *
461                  * The only exception is if the task is core dumping because
462                  * a program is not able to use ptrace(2) in that case. It is
463                  * safe because the task has stopped executing permanently.
464                  */
465                 if (permitted && (task->flags & (PF_EXITING|PF_DUMPCORE))) {
466                         if (try_get_task_stack(task)) {
467                                 eip = KSTK_EIP(task);
468                                 esp = KSTK_ESP(task);
469                                 put_task_stack(task);
470                         }
471                 }
472         }
473 
474         sigemptyset(&sigign);
475         sigemptyset(&sigcatch);
476         cutime = cstime = utime = stime = 0;
477         cgtime = gtime = 0;
478 
479         if (lock_task_sighand(task, &flags)) {
480                 struct signal_struct *sig = task->signal;
481 
482                 if (sig->tty) {
483                         struct pid *pgrp = tty_get_pgrp(sig->tty);
484                         tty_pgrp = pid_nr_ns(pgrp, ns);
485                         put_pid(pgrp);
486                         tty_nr = new_encode_dev(tty_devnum(sig->tty));
487                 }
488 
489                 num_threads = get_nr_threads(task);
490                 collect_sigign_sigcatch(task, &sigign, &sigcatch);
491 
492                 cmin_flt = sig->cmin_flt;
493                 cmaj_flt = sig->cmaj_flt;
494                 cutime = sig->cutime;
495                 cstime = sig->cstime;
496                 cgtime = sig->cgtime;
497                 rsslim = READ_ONCE(sig->rlim[RLIMIT_RSS].rlim_cur);
498 
499                 /* add up live thread stats at the group level */
500                 if (whole) {
501                         struct task_struct *t = task;
502                         do {
503                                 min_flt += t->min_flt;
504                                 maj_flt += t->maj_flt;
505                                 gtime += task_gtime(t);
506                         } while_each_thread(task, t);
507 
508                         min_flt += sig->min_flt;
509                         maj_flt += sig->maj_flt;
510                         thread_group_cputime_adjusted(task, &utime, &stime);
511                         gtime += sig->gtime;
512                 }
513 
514                 sid = task_session_nr_ns(task, ns);
515                 ppid = task_tgid_nr_ns(task->real_parent, ns);
516                 pgid = task_pgrp_nr_ns(task, ns);
517 
518                 unlock_task_sighand(task, &flags);
519         }
520 
521         if (permitted && (!whole || num_threads < 2))
522                 wchan = get_wchan(task);
523         if (!whole) {
524                 min_flt = task->min_flt;
525                 maj_flt = task->maj_flt;
526                 task_cputime_adjusted(task, &utime, &stime);
527                 gtime = task_gtime(task);
528         }
529 
530         /* scale priority and nice values from timeslices to -20..20 */
531         /* to make it look like a "normal" Unix priority/nice value  */
532         priority = task_prio(task);
533         nice = task_nice(task);
534 
535         /* convert nsec -> ticks */
536         start_time = nsec_to_clock_t(task->real_start_time);
537 
538         seq_put_decimal_ull(m, "", pid_nr_ns(pid, ns));
539         seq_puts(m, " (");
540         proc_task_name(m, task, false);
541         seq_puts(m, ") ");
542         seq_putc(m, state);
543         seq_put_decimal_ll(m, " ", ppid);
544         seq_put_decimal_ll(m, " ", pgid);
545         seq_put_decimal_ll(m, " ", sid);
546         seq_put_decimal_ll(m, " ", tty_nr);
547         seq_put_decimal_ll(m, " ", tty_pgrp);
548         seq_put_decimal_ull(m, " ", task->flags);
549         seq_put_decimal_ull(m, " ", min_flt);
550         seq_put_decimal_ull(m, " ", cmin_flt);
551         seq_put_decimal_ull(m, " ", maj_flt);
552         seq_put_decimal_ull(m, " ", cmaj_flt);
553         seq_put_decimal_ull(m, " ", nsec_to_clock_t(utime));
554         seq_put_decimal_ull(m, " ", nsec_to_clock_t(stime));
555         seq_put_decimal_ll(m, " ", nsec_to_clock_t(cutime));
556         seq_put_decimal_ll(m, " ", nsec_to_clock_t(cstime));
557         seq_put_decimal_ll(m, " ", priority);
558         seq_put_decimal_ll(m, " ", nice);
559         seq_put_decimal_ll(m, " ", num_threads);
560         seq_put_decimal_ull(m, " ", 0);
561         seq_put_decimal_ull(m, " ", start_time);
562         seq_put_decimal_ull(m, " ", vsize);
563         seq_put_decimal_ull(m, " ", mm ? get_mm_rss(mm) : 0);
564         seq_put_decimal_ull(m, " ", rsslim);
565         seq_put_decimal_ull(m, " ", mm ? (permitted ? mm->start_code : 1) : 0);
566         seq_put_decimal_ull(m, " ", mm ? (permitted ? mm->end_code : 1) : 0);
567         seq_put_decimal_ull(m, " ", (permitted && mm) ? mm->start_stack : 0);
568         seq_put_decimal_ull(m, " ", esp);
569         seq_put_decimal_ull(m, " ", eip);
570         /* The signal information here is obsolete.
571          * It must be decimal for Linux 2.0 compatibility.
572          * Use /proc/#/status for real-time signals.
573          */
574         seq_put_decimal_ull(m, " ", task->pending.signal.sig[0] & 0x7fffffffUL);
575         seq_put_decimal_ull(m, " ", task->blocked.sig[0] & 0x7fffffffUL);
576         seq_put_decimal_ull(m, " ", sigign.sig[0] & 0x7fffffffUL);
577         seq_put_decimal_ull(m, " ", sigcatch.sig[0] & 0x7fffffffUL);
578 
579         /*
580          * We used to output the absolute kernel address, but that's an
581          * information leak - so instead we show a 0/1 flag here, to signal
582          * to user-space whether there's a wchan field in /proc/PID/wchan.
583          *
584          * This works with older implementations of procps as well.
585          */
586         if (wchan)
587                 seq_puts(m, " 1");
588         else
589                 seq_puts(m, " 0");
590 
591         seq_put_decimal_ull(m, " ", 0);
592         seq_put_decimal_ull(m, " ", 0);
593         seq_put_decimal_ll(m, " ", task->exit_signal);
594         seq_put_decimal_ll(m, " ", task_cpu(task));
595         seq_put_decimal_ull(m, " ", task->rt_priority);
596         seq_put_decimal_ull(m, " ", task->policy);
597         seq_put_decimal_ull(m, " ", delayacct_blkio_ticks(task));
598         seq_put_decimal_ull(m, " ", nsec_to_clock_t(gtime));
599         seq_put_decimal_ll(m, " ", nsec_to_clock_t(cgtime));
600 
601         if (mm && permitted) {
602                 seq_put_decimal_ull(m, " ", mm->start_data);
603                 seq_put_decimal_ull(m, " ", mm->end_data);
604                 seq_put_decimal_ull(m, " ", mm->start_brk);
605                 seq_put_decimal_ull(m, " ", mm->arg_start);
606                 seq_put_decimal_ull(m, " ", mm->arg_end);
607                 seq_put_decimal_ull(m, " ", mm->env_start);
608                 seq_put_decimal_ull(m, " ", mm->env_end);
609         } else
610                 seq_puts(m, " 0 0 0 0 0 0 0");
611 
612         if (permitted)
613                 seq_put_decimal_ll(m, " ", task->exit_code);
614         else
615                 seq_puts(m, " 0");
616 
617         seq_putc(m, '\n');
618         if (mm)
619                 mmput(mm);
620         return 0;
621 }
622 
623 int proc_tid_stat(struct seq_file *m, struct pid_namespace *ns,
624                         struct pid *pid, struct task_struct *task)
625 {
626         return do_task_stat(m, ns, pid, task, 0);
627 }
628 
629 int proc_tgid_stat(struct seq_file *m, struct pid_namespace *ns,
630                         struct pid *pid, struct task_struct *task)
631 {
632         return do_task_stat(m, ns, pid, task, 1);
633 }
634 
635 int proc_pid_statm(struct seq_file *m, struct pid_namespace *ns,
636                         struct pid *pid, struct task_struct *task)
637 {
638         unsigned long size = 0, resident = 0, shared = 0, text = 0, data = 0;
639         struct mm_struct *mm = get_task_mm(task);
640 
641         if (mm) {
642                 size = task_statm(mm, &shared, &text, &data, &resident);
643                 mmput(mm);
644         }
645         /*
646          * For quick read, open code by putting numbers directly
647          * expected format is
648          * seq_printf(m, "%lu %lu %lu %lu 0 %lu 0\n",
649          *               size, resident, shared, text, data);
650          */
651         seq_put_decimal_ull(m, "", size);
652         seq_put_decimal_ull(m, " ", resident);
653         seq_put_decimal_ull(m, " ", shared);
654         seq_put_decimal_ull(m, " ", text);
655         seq_put_decimal_ull(m, " ", 0);
656         seq_put_decimal_ull(m, " ", data);
657         seq_put_decimal_ull(m, " ", 0);
658         seq_putc(m, '\n');
659 
660         return 0;
661 }
662 
663 #ifdef CONFIG_PROC_CHILDREN
664 static struct pid *
665 get_children_pid(struct inode *inode, struct pid *pid_prev, loff_t pos)
666 {
667         struct task_struct *start, *task;
668         struct pid *pid = NULL;
669 
670         read_lock(&tasklist_lock);
671 
672         start = pid_task(proc_pid(inode), PIDTYPE_PID);
673         if (!start)
674                 goto out;
675 
676         /*
677          * Lets try to continue searching first, this gives
678          * us significant speedup on children-rich processes.
679          */
680         if (pid_prev) {
681                 task = pid_task(pid_prev, PIDTYPE_PID);
682                 if (task && task->real_parent == start &&
683                     !(list_empty(&task->sibling))) {
684                         if (list_is_last(&task->sibling, &start->children))
685                                 goto out;
686                         task = list_first_entry(&task->sibling,
687                                                 struct task_struct, sibling);
688                         pid = get_pid(task_pid(task));
689                         goto out;
690                 }
691         }
692 
693         /*
694          * Slow search case.
695          *
696          * We might miss some children here if children
697          * are exited while we were not holding the lock,
698          * but it was never promised to be accurate that
699          * much.
700          *
701          * "Just suppose that the parent sleeps, but N children
702          *  exit after we printed their tids. Now the slow paths
703          *  skips N extra children, we miss N tasks." (c)
704          *
705          * So one need to stop or freeze the leader and all
706          * its children to get a precise result.
707          */
708         list_for_each_entry(task, &start->children, sibling) {
709                 if (pos-- == 0) {
710                         pid = get_pid(task_pid(task));
711                         break;
712                 }
713         }
714 
715 out:
716         read_unlock(&tasklist_lock);
717         return pid;
718 }
719 
720 static int children_seq_show(struct seq_file *seq, void *v)
721 {
722         struct inode *inode = file_inode(seq->file);
723 
724         seq_printf(seq, "%d ", pid_nr_ns(v, proc_pid_ns(inode)));
725         return 0;
726 }
727 
728 static void *children_seq_start(struct seq_file *seq, loff_t *pos)
729 {
730         return get_children_pid(file_inode(seq->file), NULL, *pos);
731 }
732 
733 static void *children_seq_next(struct seq_file *seq, void *v, loff_t *pos)
734 {
735         struct pid *pid;
736 
737         pid = get_children_pid(file_inode(seq->file), v, *pos + 1);
738         put_pid(v);
739 
740         ++*pos;
741         return pid;
742 }
743 
744 static void children_seq_stop(struct seq_file *seq, void *v)
745 {
746         put_pid(v);
747 }
748 
749 static const struct seq_operations children_seq_ops = {
750         .start  = children_seq_start,
751         .next   = children_seq_next,
752         .stop   = children_seq_stop,
753         .show   = children_seq_show,
754 };
755 
756 static int children_seq_open(struct inode *inode, struct file *file)
757 {
758         return seq_open(file, &children_seq_ops);
759 }
760 
761 const struct file_operations proc_tid_children_operations = {
762         .open    = children_seq_open,
763         .read    = seq_read,
764         .llseek  = seq_lseek,
765         .release = seq_release,
766 };
767 #endif /* CONFIG_PROC_CHILDREN */
768 

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