projects/linux·blob uaccess-cleanups · refs

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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 * <[email protected]>
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 * <[email protected]>
17 *
18 * Danny ter Haar : added cpuinfo
19 * <[email protected]>
20 *
21 * Alessandro Rubini : profile extension.
22 * <[email protected]>
23 *
24 * Jeff Tranter : added BogoMips field to cpuinfo
25 * <[email protected]>
26 *
27 * Bruno Haible : remove 4K limit for the maps file
28 * <[email protected]>
29 *
30 * Yves Arrouye : remove removal of trailing spaces in get_array.
31 * <[email protected]>
32 *
33 * Jerome Forissier : added per-CPU time information to /proc/stat
34 * and /proc/<pid>/cpu extension
35 * <[email protected]>
36 * - Incorporation and non-SMP safe operation
37 * of forissier patch in 2.1.78 by
38 * Hans Marcus <[email protected]>
39 *
40 * [email protected] : /proc/partitions
41 *
42 *
43 * Alan Cox : security fixes.
44 * <[email protected]>
45 *
46 * Al Viro : safe handling of mm_struct
47 *
48 * Gerhard Wichert : added BIGMEM support
49 * Siemens AG <[email protected]>
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/hex.h>
59#include <linux/time.h>
60#include <linux/time_namespace.h>
61#include <linux/kernel.h>
62#include <linux/kernel_stat.h>
63#include <linux/tty.h>
64#include <linux/string.h>
65#include <linux/mman.h>
66#include <linux/sched/mm.h>
67#include <linux/sched/numa_balancing.h>
68#include <linux/sched/task_stack.h>
69#include <linux/sched/task.h>
70#include <linux/sched/cputime.h>
71#include <linux/proc_fs.h>
72#include <linux/ioport.h>
73#include <linux/io.h>
74#include <linux/mm.h>
75#include <linux/hugetlb.h>
76#include <linux/pagemap.h>
77#include <linux/swap.h>
78#include <linux/smp.h>
79#include <linux/signal.h>
80#include <linux/highmem.h>
81#include <linux/file.h>
82#include <linux/fdtable.h>
83#include <linux/times.h>
84#include <linux/cpuset.h>
85#include <linux/rcupdate.h>
86#include <linux/delayacct.h>
87#include <linux/seq_file.h>
88#include <linux/pid_namespace.h>
89#include <linux/prctl.h>
90#include <linux/ptrace.h>
91#include <linux/string_helpers.h>
92#include <linux/user_namespace.h>
93#include <linux/fs_struct.h>
94#include <linux/kthread.h>
95#include <linux/mmu_context.h>
96
97#include <asm/processor.h>
98#include "internal.h"
99
100void proc_task_name(struct seq_file *m, struct task_struct *p, bool escape)
101{
102 char tcomm[64];
103
104 /*
105 * Test before PF_KTHREAD because all workqueue worker threads are
106 * kernel threads.
107 */
108 if (p->flags & PF_WQ_WORKER)
109 wq_worker_comm(tcomm, sizeof(tcomm), p);
110 else if (p->flags & PF_KTHREAD)
111 get_kthread_comm(tcomm, sizeof(tcomm), p);
112 else
113 get_task_comm(tcomm, p);
114
115 if (escape)
116 seq_escape_str(m, tcomm, ESCAPE_SPACE | ESCAPE_SPECIAL, "\n\\");
117 else
118 seq_printf(m, "%.64s", tcomm);
119}
120
121/*
122 * The task state array is a strange "bitmap" of
123 * reasons to sleep. Thus "running" is zero, and
124 * you can test for combinations of others with
125 * simple bit tests.
126 */
127static const char * const task_state_array[] = {
128
129 /* states in TASK_REPORT: */
130 "R (running)", /* 0x00 */
131 "S (sleeping)", /* 0x01 */
132 "D (disk sleep)", /* 0x02 */
133 "T (stopped)", /* 0x04 */
134 "t (tracing stop)", /* 0x08 */
135 "X (dead)", /* 0x10 */
136 "Z (zombie)", /* 0x20 */
137 "P (parked)", /* 0x40 */
138
139 /* states beyond TASK_REPORT: */
140 "I (idle)", /* 0x80 */
141};
142
143static inline const char *get_task_state(struct task_struct *tsk)
144{
145 BUILD_BUG_ON(1 + ilog2(TASK_REPORT_MAX) != ARRAY_SIZE(task_state_array));
146 return task_state_array[task_state_index(tsk)];
147}
148
149static inline void task_state(struct seq_file *m, struct pid_namespace *ns,
150 struct pid *pid, struct task_struct *p)
151{
152 struct user_namespace *user_ns = seq_user_ns(m);
153 struct group_info *group_info;
154 int g, umask = -1;
155 struct task_struct *tracer;
156 const struct cred *cred;
157 pid_t ppid, tpid = 0, tgid, ngid;
158 unsigned int max_fds = 0;
159
160 rcu_read_lock();
161 tracer = ptrace_parent(p);
162 if (tracer)
163 tpid = task_pid_nr_ns(tracer, ns);
164
165 ppid = task_ppid_nr_ns(p, ns);
166 tgid = task_tgid_nr_ns(p, ns);
167 ngid = task_numa_group_id(p);
168 cred = get_task_cred(p);
169
170 task_lock(p);
171 if (p->real_fs)
172 umask = p->real_fs->umask;
173 if (p->files)
174 max_fds = files_fdtable(p->files)->max_fds;
175 task_unlock(p);
176 rcu_read_unlock();
177
178 if (umask >= 0)
179 seq_printf(m, "Umask:\t%#04o\n", umask);
180 seq_puts(m, "State:\t");
181 seq_puts(m, get_task_state(p));
182
183 seq_put_decimal_ull(m, "\nTgid:\t", tgid);
184 seq_put_decimal_ull(m, "\nNgid:\t", ngid);
185 seq_put_decimal_ull(m, "\nPid:\t", pid_nr_ns(pid, ns));
186 seq_put_decimal_ull(m, "\nPPid:\t", ppid);
187 seq_put_decimal_ull(m, "\nTracerPid:\t", tpid);
188 seq_put_decimal_ull(m, "\nUid:\t", from_kuid_munged(user_ns, cred->uid));
189 seq_put_decimal_ull(m, "\t", from_kuid_munged(user_ns, cred->euid));
190 seq_put_decimal_ull(m, "\t", from_kuid_munged(user_ns, cred->suid));
191 seq_put_decimal_ull(m, "\t", from_kuid_munged(user_ns, cred->fsuid));
192 seq_put_decimal_ull(m, "\nGid:\t", from_kgid_munged(user_ns, cred->gid));
193 seq_put_decimal_ull(m, "\t", from_kgid_munged(user_ns, cred->egid));
194 seq_put_decimal_ull(m, "\t", from_kgid_munged(user_ns, cred->sgid));
195 seq_put_decimal_ull(m, "\t", from_kgid_munged(user_ns, cred->fsgid));
196 seq_put_decimal_ull(m, "\nFDSize:\t", max_fds);
197
198 seq_puts(m, "\nGroups:\t");
199 group_info = cred->group_info;
200 for (g = 0; g < group_info->ngroups; g++)
201 seq_put_decimal_ull(m, g ? " " : "",
202 from_kgid_munged(user_ns, group_info->gid[g]));
203 put_cred(cred);
204 /* Trailing space shouldn't have been added in the first place. */
205 seq_putc(m, ' ');
206
207#ifdef CONFIG_PID_NS
208 seq_puts(m, "\nNStgid:");
209 for (g = ns->level; g <= pid->level; g++)
210 seq_put_decimal_ull(m, "\t", task_tgid_nr_ns(p, pid->numbers[g].ns));
211 seq_puts(m, "\nNSpid:");
212 for (g = ns->level; g <= pid->level; g++)
213 seq_put_decimal_ull(m, "\t", task_pid_nr_ns(p, pid->numbers[g].ns));
214 seq_puts(m, "\nNSpgid:");
215 for (g = ns->level; g <= pid->level; g++)
216 seq_put_decimal_ull(m, "\t", task_pgrp_nr_ns(p, pid->numbers[g].ns));
217 seq_puts(m, "\nNSsid:");
218 for (g = ns->level; g <= pid->level; g++)
219 seq_put_decimal_ull(m, "\t", task_session_nr_ns(p, pid->numbers[g].ns));
220#endif
221 seq_putc(m, '\n');
222
223 seq_printf(m, "Kthread:\t%c\n", p->flags & PF_KTHREAD ? '1' : '0');
224}
225
226void render_sigset_t(struct seq_file *m, const char *header,
227 sigset_t *set)
228{
229 int i;
230
231 seq_puts(m, header);
232
233 i = _NSIG;
234 do {
235 int x = 0;
236
237 i -= 4;
238 if (sigismember(set, i+1)) x |= 1;
239 if (sigismember(set, i+2)) x |= 2;
240 if (sigismember(set, i+3)) x |= 4;
241 if (sigismember(set, i+4)) x |= 8;
242 seq_putc(m, hex_asc[x]);
243 } while (i >= 4);
244
245 seq_putc(m, '\n');
246}
247
248static void collect_sigign_sigcatch(struct task_struct *p, sigset_t *sigign,
249 sigset_t *sigcatch)
250{
251 struct k_sigaction *k;
252 int i;
253
254 k = p->sighand->action;
255 for (i = 1; i <= _NSIG; ++i, ++k) {
256 if (k->sa.sa_handler == SIG_IGN)
257 sigaddset(sigign, i);
258 else if (k->sa.sa_handler != SIG_DFL)
259 sigaddset(sigcatch, i);
260 }
261}
262
263static inline void task_sig(struct seq_file *m, struct task_struct *p)
264{
265 unsigned long flags;
266 sigset_t pending, shpending, blocked, ignored, caught;
267 int num_threads = 0;
268 unsigned int qsize = 0;
269 unsigned long qlim = 0;
270
271 sigemptyset(&pending);
272 sigemptyset(&shpending);
273 sigemptyset(&blocked);
274 sigemptyset(&ignored);
275 sigemptyset(&caught);
276
277 if (lock_task_sighand(p, &flags)) {
278 pending = p->pending.signal;
279 shpending = p->signal->shared_pending.signal;
280 blocked = p->blocked;
281 collect_sigign_sigcatch(p, &ignored, &caught);
282 num_threads = get_nr_threads(p);
283 rcu_read_lock();
284 qsize = get_rlimit_value(task_ucounts(p), UCOUNT_RLIMIT_SIGPENDING);
285 rcu_read_unlock();
286 qlim = task_rlimit(p, RLIMIT_SIGPENDING);
287 unlock_task_sighand(p, &flags);
288 }
289
290 seq_put_decimal_ull(m, "Threads:\t", num_threads);
291 seq_put_decimal_ull(m, "\nSigQ:\t", qsize);
292 seq_put_decimal_ull(m, "/", qlim);
293
294 /* render them all */
295 render_sigset_t(m, "\nSigPnd:\t", &pending);
296 render_sigset_t(m, "ShdPnd:\t", &shpending);
297 render_sigset_t(m, "SigBlk:\t", &blocked);
298 render_sigset_t(m, "SigIgn:\t", &ignored);
299 render_sigset_t(m, "SigCgt:\t", &caught);
300}
301
302static void render_cap_t(struct seq_file *m, const char *header,
303 kernel_cap_t *a)
304{
305 seq_puts(m, header);
306 seq_put_hex_ll(m, NULL, a->val, 16);
307 seq_putc(m, '\n');
308}
309
310static inline void task_cap(struct seq_file *m, struct task_struct *p)
311{
312 const struct cred *cred;
313 kernel_cap_t cap_inheritable, cap_permitted, cap_effective,
314 cap_bset, cap_ambient;
315
316 rcu_read_lock();
317 cred = __task_cred(p);
318 cap_inheritable = cred->cap_inheritable;
319 cap_permitted = cred->cap_permitted;
320 cap_effective = cred->cap_effective;
321 cap_bset = cred->cap_bset;
322 cap_ambient = cred->cap_ambient;
323 rcu_read_unlock();
324
325 render_cap_t(m, "CapInh:\t", &cap_inheritable);
326 render_cap_t(m, "CapPrm:\t", &cap_permitted);
327 render_cap_t(m, "CapEff:\t", &cap_effective);
328 render_cap_t(m, "CapBnd:\t", &cap_bset);
329 render_cap_t(m, "CapAmb:\t", &cap_ambient);
330}
331
332static inline void task_seccomp(struct seq_file *m, struct task_struct *p)
333{
334 seq_put_decimal_ull(m, "NoNewPrivs:\t", task_no_new_privs(p));
335#ifdef CONFIG_SECCOMP
336 seq_put_decimal_ull(m, "\nSeccomp:\t", p->seccomp.mode);
337#ifdef CONFIG_SECCOMP_FILTER
338 seq_put_decimal_ull(m, "\nSeccomp_filters:\t",
339 atomic_read(&p->seccomp.filter_count));
340#endif
341#endif
342 seq_puts(m, "\nSpeculation_Store_Bypass:\t");
343 switch (arch_prctl_spec_ctrl_get(p, PR_SPEC_STORE_BYPASS)) {
344 case -EINVAL:
345 seq_puts(m, "unknown");
346 break;
347 case PR_SPEC_NOT_AFFECTED:
348 seq_puts(m, "not vulnerable");
349 break;
350 case PR_SPEC_PRCTL | PR_SPEC_FORCE_DISABLE:
351 seq_puts(m, "thread force mitigated");
352 break;
353 case PR_SPEC_PRCTL | PR_SPEC_DISABLE:
354 seq_puts(m, "thread mitigated");
355 break;
356 case PR_SPEC_PRCTL | PR_SPEC_ENABLE:
357 seq_puts(m, "thread vulnerable");
358 break;
359 case PR_SPEC_DISABLE:
360 seq_puts(m, "globally mitigated");
361 break;
362 default:
363 seq_puts(m, "vulnerable");
364 break;
365 }
366
367 seq_puts(m, "\nSpeculationIndirectBranch:\t");
368 switch (arch_prctl_spec_ctrl_get(p, PR_SPEC_INDIRECT_BRANCH)) {
369 case -EINVAL:
370 seq_puts(m, "unsupported");
371 break;
372 case PR_SPEC_NOT_AFFECTED:
373 seq_puts(m, "not affected");
374 break;
375 case PR_SPEC_PRCTL | PR_SPEC_FORCE_DISABLE:
376 seq_puts(m, "conditional force disabled");
377 break;
378 case PR_SPEC_PRCTL | PR_SPEC_DISABLE:
379 seq_puts(m, "conditional disabled");
380 break;
381 case PR_SPEC_PRCTL | PR_SPEC_ENABLE:
382 seq_puts(m, "conditional enabled");
383 break;
384 case PR_SPEC_ENABLE:
385 seq_puts(m, "always enabled");
386 break;
387 case PR_SPEC_DISABLE:
388 seq_puts(m, "always disabled");
389 break;
390 default:
391 seq_puts(m, "unknown");
392 break;
393 }
394 seq_putc(m, '\n');
395}
396
397static inline void task_context_switch_counts(struct seq_file *m,
398 struct task_struct *p)
399{
400 seq_put_decimal_ull(m, "voluntary_ctxt_switches:\t", p->nvcsw);
401 seq_put_decimal_ull(m, "\nnonvoluntary_ctxt_switches:\t", p->nivcsw);
402 seq_putc(m, '\n');
403}
404
405static void task_cpus_allowed(struct seq_file *m, struct task_struct *task)
406{
407 seq_printf(m, "Cpus_allowed:\t%*pb\n",
408 cpumask_pr_args(&task->cpus_mask));
409 seq_printf(m, "Cpus_allowed_list:\t%*pbl\n",
410 cpumask_pr_args(&task->cpus_mask));
411}
412
413static inline void task_core_dumping(struct seq_file *m, struct task_struct *task)
414{
415 seq_put_decimal_ull(m, "CoreDumping:\t", !!task->signal->core_state);
416 seq_putc(m, '\n');
417}
418
419static inline void task_thp_status(struct seq_file *m, struct mm_struct *mm)
420{
421 bool thp_enabled = IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE);
422
423 if (thp_enabled)
424 thp_enabled = !mm_flags_test(MMF_DISABLE_THP_COMPLETELY, mm);
425 seq_printf(m, "THP_enabled:\t%d\n", thp_enabled);
426}
427
428static inline void task_untag_mask(struct seq_file *m, struct mm_struct *mm)
429{
430 seq_printf(m, "untag_mask:\t%#lx\n", mm_untag_mask(mm));
431}
432
433__weak void arch_proc_pid_thread_features(struct seq_file *m,
434 struct task_struct *task)
435{
436}
437
438int proc_pid_status(struct seq_file *m, struct pid_namespace *ns,
439 struct pid *pid, struct task_struct *task)
440{
441 struct mm_struct *mm = get_task_mm(task);
442
443 seq_puts(m, "Name:\t");
444 proc_task_name(m, task, true);
445 seq_putc(m, '\n');
446
447 task_state(m, ns, pid, task);
448
449 if (mm) {
450 task_mem(m, mm);
451 task_core_dumping(m, task);
452 task_thp_status(m, mm);
453 task_untag_mask(m, mm);
454 mmput(mm);
455 }
456 task_sig(m, task);
457 task_cap(m, task);
458 task_seccomp(m, task);
459 task_cpus_allowed(m, task);
460 cpuset_task_status_allowed(m, task);
461 task_context_switch_counts(m, task);
462 arch_proc_pid_thread_features(m, task);
463 return 0;
464}
465
466static int do_task_stat(struct seq_file *m, struct pid_namespace *ns,
467 struct pid *pid, struct task_struct *task, int whole)
468{
469 unsigned long vsize, eip, esp, wchan = 0;
470 int priority, nice;
471 int tty_pgrp = -1, tty_nr = 0;
472 sigset_t sigign, sigcatch;
473 char state;
474 pid_t ppid = 0, pgid = -1, sid = -1;
475 int num_threads = 0;
476 int permitted;
477 struct mm_struct *mm;
478 unsigned long long start_time;
479 unsigned long cmin_flt, cmaj_flt, min_flt, maj_flt;
480 u64 cutime, cstime, cgtime, utime, stime, gtime;
481 unsigned long rsslim = 0;
482 unsigned long flags;
483 int exit_code = task->exit_code;
484 struct signal_struct *sig = task->signal;
485 int ret;
486
487 ret = down_read_killable(&task->signal->exec_update_lock);
488 if (ret)
489 return ret;
490
491 state = *get_task_state(task);
492 vsize = eip = esp = 0;
493 permitted = ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS | PTRACE_MODE_NOAUDIT);
494 mm = get_task_mm(task);
495 if (mm) {
496 vsize = task_vsize(mm);
497 /*
498 * esp and eip are intentionally zeroed out. There is no
499 * non-racy way to read them without freezing the task.
500 * Programs that need reliable values can use ptrace(2).
501 *
502 * The only exception is if the task is core dumping because
503 * a program is not able to use ptrace(2) in that case. It is
504 * safe because the task has stopped executing permanently.
505 */
506 if (permitted && (task->flags & (PF_EXITING|PF_DUMPCORE|PF_POSTCOREDUMP))) {
507 if (try_get_task_stack(task)) {
508 eip = KSTK_EIP(task);
509 esp = KSTK_ESP(task);
510 put_task_stack(task);
511 }
512 }
513 }
514
515 sigemptyset(&sigign);
516 sigemptyset(&sigcatch);
517
518 if (lock_task_sighand(task, &flags)) {
519 if (sig->tty) {
520 struct pid *pgrp = tty_get_pgrp(sig->tty);
521 tty_pgrp = pid_nr_ns(pgrp, ns);
522 put_pid(pgrp);
523 tty_nr = new_encode_dev(tty_devnum(sig->tty));
524 }
525
526 num_threads = get_nr_threads(task);
527 collect_sigign_sigcatch(task, &sigign, &sigcatch);
528
529 rsslim = READ_ONCE(sig->rlim[RLIMIT_RSS].rlim_cur);
530
531 if (whole) {
532 if (sig->flags & (SIGNAL_GROUP_EXIT | SIGNAL_STOP_STOPPED))
533 exit_code = sig->group_exit_code;
534 }
535
536 sid = task_session_nr_ns(task, ns);
537 ppid = task_ppid_nr_ns(task, ns);
538 pgid = task_pgrp_nr_ns(task, ns);
539
540 unlock_task_sighand(task, &flags);
541 }
542
543 if (permitted && (!whole || num_threads < 2))
544 wchan = !task_is_running(task);
545
546 scoped_guard(rcu) {
547 scoped_seqlock_read (&sig->stats_lock, ss_lock_irqsave) {
548 cmin_flt = sig->cmin_flt;
549 cmaj_flt = sig->cmaj_flt;
550 cutime = sig->cutime;
551 cstime = sig->cstime;
552 cgtime = sig->cgtime;
553
554 if (whole) {
555 struct task_struct *t;
556
557 min_flt = sig->min_flt;
558 maj_flt = sig->maj_flt;
559 gtime = sig->gtime;
560
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 }
567 }
568 }
569
570 if (whole) {
571 thread_group_cputime_adjusted(task, &utime, &stime);
572 } else {
573 task_cputime_adjusted(task, &utime, &stime);
574 min_flt = task->min_flt;
575 maj_flt = task->maj_flt;
576 gtime = task_gtime(task);
577 }
578
579 /* scale priority and nice values from timeslices to -20..20 */
580 /* to make it look like a "normal" Unix priority/nice value */
581 priority = task_prio(task);
582 nice = task_nice(task);
583
584 /* apply timens offset for boottime and convert nsec -> ticks */
585 start_time =
586 nsec_to_clock_t(timens_add_boottime_ns(task->start_boottime));
587
588 seq_put_decimal_ull(m, "", pid_nr_ns(pid, ns));
589 seq_puts(m, " (");
590 proc_task_name(m, task, false);
591 seq_puts(m, ") ");
592 seq_putc(m, state);
593 seq_put_decimal_ll(m, " ", ppid);
594 seq_put_decimal_ll(m, " ", pgid);
595 seq_put_decimal_ll(m, " ", sid);
596 seq_put_decimal_ll(m, " ", tty_nr);
597 seq_put_decimal_ll(m, " ", tty_pgrp);
598 seq_put_decimal_ull(m, " ", task->flags);
599 seq_put_decimal_ull(m, " ", min_flt);
600 seq_put_decimal_ull(m, " ", cmin_flt);
601 seq_put_decimal_ull(m, " ", maj_flt);
602 seq_put_decimal_ull(m, " ", cmaj_flt);
603 seq_put_decimal_ull(m, " ", nsec_to_clock_t(utime));
604 seq_put_decimal_ull(m, " ", nsec_to_clock_t(stime));
605 seq_put_decimal_ll(m, " ", nsec_to_clock_t(cutime));
606 seq_put_decimal_ll(m, " ", nsec_to_clock_t(cstime));
607 seq_put_decimal_ll(m, " ", priority);
608 seq_put_decimal_ll(m, " ", nice);
609 seq_put_decimal_ll(m, " ", num_threads);
610 seq_put_decimal_ull(m, " ", 0);
611 seq_put_decimal_ull(m, " ", start_time);
612 seq_put_decimal_ull(m, " ", vsize);
613 seq_put_decimal_ull(m, " ", mm ? get_mm_rss(mm) : 0);
614 seq_put_decimal_ull(m, " ", rsslim);
615 seq_put_decimal_ull(m, " ", mm ? (permitted ? mm->start_code : 1) : 0);
616 seq_put_decimal_ull(m, " ", mm ? (permitted ? mm->end_code : 1) : 0);
617 seq_put_decimal_ull(m, " ", (permitted && mm) ? mm->start_stack : 0);
618 seq_put_decimal_ull(m, " ", esp);
619 seq_put_decimal_ull(m, " ", eip);
620 /* The signal information here is obsolete.
621 * It must be decimal for Linux 2.0 compatibility.
622 * Use /proc/#/status for real-time signals.
623 */
624 seq_put_decimal_ull(m, " ", task->pending.signal.sig[0] & 0x7fffffffUL);
625 seq_put_decimal_ull(m, " ", task->blocked.sig[0] & 0x7fffffffUL);
626 seq_put_decimal_ull(m, " ", sigign.sig[0] & 0x7fffffffUL);
627 seq_put_decimal_ull(m, " ", sigcatch.sig[0] & 0x7fffffffUL);
628
629 /*
630 * We used to output the absolute kernel address, but that's an
631 * information leak - so instead we show a 0/1 flag here, to signal
632 * to user-space whether there's a wchan field in /proc/PID/wchan.
633 *
634 * This works with older implementations of procps as well.
635 */
636 seq_put_decimal_ull(m, " ", wchan);
637
638 seq_put_decimal_ull(m, " ", 0);
639 seq_put_decimal_ull(m, " ", 0);
640 seq_put_decimal_ll(m, " ", task->exit_signal);
641 seq_put_decimal_ll(m, " ", task_cpu(task));
642 seq_put_decimal_ull(m, " ", task->rt_priority);
643 seq_put_decimal_ull(m, " ", task->policy);
644 seq_put_decimal_ull(m, " ", delayacct_blkio_ticks(task));
645 seq_put_decimal_ull(m, " ", nsec_to_clock_t(gtime));
646 seq_put_decimal_ll(m, " ", nsec_to_clock_t(cgtime));
647
648 if (mm && permitted) {
649 seq_put_decimal_ull(m, " ", mm->start_data);
650 seq_put_decimal_ull(m, " ", mm->end_data);
651 seq_put_decimal_ull(m, " ", mm->start_brk);
652 seq_put_decimal_ull(m, " ", mm->arg_start);
653 seq_put_decimal_ull(m, " ", mm->arg_end);
654 seq_put_decimal_ull(m, " ", mm->env_start);
655 seq_put_decimal_ull(m, " ", mm->env_end);
656 } else
657 seq_puts(m, " 0 0 0 0 0 0 0");
658
659 if (permitted)
660 seq_put_decimal_ll(m, " ", exit_code);
661 else
662 seq_puts(m, " 0");
663
664 seq_putc(m, '\n');
665 up_read(&task->signal->exec_update_lock);
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 directly
700 * expected format is
701 * 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_CHILDREN
719static 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 gives
733 * 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 children
752 * are exited while we were not holding the lock,
753 * but it was never promised to be accurate that
754 * much.
755 *
756 * "Just suppose that the parent sleeps, but N children
757 * exit after we printed their tids. Now the slow paths
758 * skips N extra children, we miss N tasks." (c)
759 *
760 * So one need to stop or freeze the leader and all
761 * 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 */