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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/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 are
105 * kernel threads.
106 */
107 if (p->flags & PF_WQ_WORKER)
108 wq_worker_comm(buf: tcomm, size: sizeof(tcomm), task: p);
109 else if (p->flags & PF_KTHREAD)
110 get_kthread_comm(buf: tcomm, buf_size: sizeof(tcomm), tsk: p);
111 else
112 get_task_comm(tcomm, p);
113
114 if (escape)
115 seq_escape_str(m, src: tcomm, ESCAPE_SPACE | ESCAPE_SPECIAL, esc: "\n\\");
116 else
117 seq_printf(m, fmt: "%.64s", tcomm);
118}
119
120/*
121 * The task state array is a strange "bitmap" of
122 * reasons to sleep. Thus "running" is zero, and
123 * you can test for combinations of others with
124 * 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(seq: 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 tracer = ptrace_parent(task: p);
161 if (tracer)
162 tpid = task_pid_nr_ns(tsk: tracer, ns);
163
164 ppid = task_ppid_nr_ns(tsk: p, ns);
165 tgid = task_tgid_nr_ns(tsk: p, ns);
166 ngid = task_numa_group_id(p);
167 cred = get_task_cred(p);
168
169 task_lock(p);
170 if (p->fs)
171 umask = p->fs->umask;
172 if (p->files)
173 max_fds = files_fdtable(p->files)->max_fds;
174 task_unlock(p);
175 rcu_read_unlock();
176
177 if (umask >= 0)
178 seq_printf(m, fmt: "Umask:\t%#04o\n", umask);
179 seq_puts(m, s: "State:\t");
180 seq_puts(m, s: get_task_state(tsk: p));
181
182 seq_put_decimal_ull(m, delimiter: "\nTgid:\t", num: tgid);
183 seq_put_decimal_ull(m, delimiter: "\nNgid:\t", num: ngid);
184 seq_put_decimal_ull(m, delimiter: "\nPid:\t", num: pid_nr_ns(pid, ns));
185 seq_put_decimal_ull(m, delimiter: "\nPPid:\t", num: ppid);
186 seq_put_decimal_ull(m, delimiter: "\nTracerPid:\t", num: tpid);
187 seq_put_decimal_ull(m, delimiter: "\nUid:\t", num: from_kuid_munged(to: user_ns, uid: cred->uid));
188 seq_put_decimal_ull(m, delimiter: "\t", num: from_kuid_munged(to: user_ns, uid: cred->euid));
189 seq_put_decimal_ull(m, delimiter: "\t", num: from_kuid_munged(to: user_ns, uid: cred->suid));
190 seq_put_decimal_ull(m, delimiter: "\t", num: from_kuid_munged(to: user_ns, uid: cred->fsuid));
191 seq_put_decimal_ull(m, delimiter: "\nGid:\t", num: from_kgid_munged(to: user_ns, gid: cred->gid));
192 seq_put_decimal_ull(m, delimiter: "\t", num: from_kgid_munged(to: user_ns, gid: cred->egid));
193 seq_put_decimal_ull(m, delimiter: "\t", num: from_kgid_munged(to: user_ns, gid: cred->sgid));
194 seq_put_decimal_ull(m, delimiter: "\t", num: from_kgid_munged(to: user_ns, gid: cred->fsgid));
195 seq_put_decimal_ull(m, delimiter: "\nFDSize:\t", num: max_fds);
196
197 seq_puts(m, s: "\nGroups:\t");
198 group_info = cred->group_info;
199 for (g = 0; g < group_info->ngroups; g++)
200 seq_put_decimal_ull(m, delimiter: g ? " " : "",
201 num: from_kgid_munged(to: user_ns, gid: group_info->gid[g]));
202 put_cred(cred);
203 /* Trailing space shouldn't have been added in the first place. */
204 seq_putc(m, c: ' ');
205
206#ifdef CONFIG_PID_NS
207 seq_puts(m, s: "\nNStgid:");
208 for (g = ns->level; g <= pid->level; g++)
209 seq_put_decimal_ull(m, delimiter: "\t", num: task_tgid_nr_ns(tsk: p, ns: pid->numbers[g].ns));
210 seq_puts(m, s: "\nNSpid:");
211 for (g = ns->level; g <= pid->level; g++)
212 seq_put_decimal_ull(m, delimiter: "\t", num: task_pid_nr_ns(tsk: p, ns: pid->numbers[g].ns));
213 seq_puts(m, s: "\nNSpgid:");
214 for (g = ns->level; g <= pid->level; g++)
215 seq_put_decimal_ull(m, delimiter: "\t", num: task_pgrp_nr_ns(tsk: p, ns: pid->numbers[g].ns));
216 seq_puts(m, s: "\nNSsid:");
217 for (g = ns->level; g <= pid->level; g++)
218 seq_put_decimal_ull(m, delimiter: "\t", num: task_session_nr_ns(tsk: p, ns: pid->numbers[g].ns));
219#endif
220 seq_putc(m, c: '\n');
221
222 seq_printf(m, fmt: "Kthread:\t%c\n", p->flags & PF_KTHREAD ? '1' : '0');
223}
224
225void render_sigset_t(struct seq_file *m, const char *header,
226 sigset_t *set)
227{
228 int i;
229
230 seq_puts(m, s: header);
231
232 i = _NSIG;
233 do {
234 int x = 0;
235
236 i -= 4;
237 if (sigismember(set, sig: i+1)) x |= 1;
238 if (sigismember(set, sig: i+2)) x |= 2;
239 if (sigismember(set, sig: i+3)) x |= 4;
240 if (sigismember(set, sig: i+4)) x |= 8;
241 seq_putc(m, c: hex_asc[x]);
242 } while (i >= 4);
243
244 seq_putc(m, c: '\n');
245}
246
247static void collect_sigign_sigcatch(struct task_struct *p, sigset_t *sigign,
248 sigset_t *sigcatch)
249{
250 struct k_sigaction *k;
251 int i;
252
253 k = p->sighand->action;
254 for (i = 1; i <= _NSIG; ++i, ++k) {
255 if (k->sa.sa_handler == SIG_IGN)
256 sigaddset(set: sigign, sig: i);
257 else if (k->sa.sa_handler != SIG_DFL)
258 sigaddset(set: sigcatch, sig: i);
259 }
260}
261
262static inline void task_sig(struct seq_file *m, struct task_struct *p)
263{
264 unsigned long flags;
265 sigset_t pending, shpending, blocked, ignored, caught;
266 int num_threads = 0;
267 unsigned int qsize = 0;
268 unsigned long qlim = 0;
269
270 sigemptyset(set: &pending);
271 sigemptyset(set: &shpending);
272 sigemptyset(set: &blocked);
273 sigemptyset(set: &ignored);
274 sigemptyset(set: &caught);
275
276 if (lock_task_sighand(task: p, flags: &flags)) {
277 pending = p->pending.signal;
278 shpending = p->signal->shared_pending.signal;
279 blocked = p->blocked;
280 collect_sigign_sigcatch(p, sigign: &ignored, sigcatch: &caught);
281 num_threads = get_nr_threads(task: p);
282 rcu_read_lock(); /* FIXME: is this correct? */
283 qsize = get_rlimit_value(task_ucounts(p), type: UCOUNT_RLIMIT_SIGPENDING);
284 rcu_read_unlock();
285 qlim = task_rlimit(task: p, RLIMIT_SIGPENDING);
286 unlock_task_sighand(task: p, flags: &flags);
287 }
288
289 seq_put_decimal_ull(m, delimiter: "Threads:\t", num: num_threads);
290 seq_put_decimal_ull(m, delimiter: "\nSigQ:\t", num: qsize);
291 seq_put_decimal_ull(m, delimiter: "/", num: qlim);
292
293 /* render them all */
294 render_sigset_t(m, header: "\nSigPnd:\t", set: &pending);
295 render_sigset_t(m, header: "ShdPnd:\t", set: &shpending);
296 render_sigset_t(m, header: "SigBlk:\t", set: &blocked);
297 render_sigset_t(m, header: "SigIgn:\t", set: &ignored);
298 render_sigset_t(m, header: "SigCgt:\t", set: &caught);
299}
300
301static void render_cap_t(struct seq_file *m, const char *header,
302 kernel_cap_t *a)
303{
304 seq_puts(m, s: header);
305 seq_put_hex_ll(m, NULL, v: a->val, width: 16);
306 seq_putc(m, c: '\n');
307}
308
309static inline void task_cap(struct seq_file *m, struct task_struct *p)
310{
311 const struct cred *cred;
312 kernel_cap_t cap_inheritable, cap_permitted, cap_effective,
313 cap_bset, cap_ambient;
314
315 rcu_read_lock();
316 cred = __task_cred(p);
317 cap_inheritable = cred->cap_inheritable;
318 cap_permitted = cred->cap_permitted;
319 cap_effective = cred->cap_effective;
320 cap_bset = cred->cap_bset;
321 cap_ambient = cred->cap_ambient;
322 rcu_read_unlock();
323
324 render_cap_t(m, header: "CapInh:\t", a: &cap_inheritable);
325 render_cap_t(m, header: "CapPrm:\t", a: &cap_permitted);
326 render_cap_t(m, header: "CapEff:\t", a: &cap_effective);
327 render_cap_t(m, header: "CapBnd:\t", a: &cap_bset);
328 render_cap_t(m, header: "CapAmb:\t", a: &cap_ambient);
329}
330
331static inline void task_seccomp(struct seq_file *m, struct task_struct *p)
332{
333 seq_put_decimal_ull(m, delimiter: "NoNewPrivs:\t", num: task_no_new_privs(p));
334#ifdef CONFIG_SECCOMP
335 seq_put_decimal_ull(m, delimiter: "\nSeccomp:\t", num: p->seccomp.mode);
336#ifdef CONFIG_SECCOMP_FILTER
337 seq_put_decimal_ull(m, delimiter: "\nSeccomp_filters:\t",
338 num: atomic_read(v: &p->seccomp.filter_count));
339#endif
340#endif
341 seq_puts(m, s: "\nSpeculation_Store_Bypass:\t");
342 switch (arch_prctl_spec_ctrl_get(task: p, PR_SPEC_STORE_BYPASS)) {
343 case -EINVAL:
344 seq_puts(m, s: "unknown");
345 break;
346 case PR_SPEC_NOT_AFFECTED:
347 seq_puts(m, s: "not vulnerable");
348 break;
349 case PR_SPEC_PRCTL | PR_SPEC_FORCE_DISABLE:
350 seq_puts(m, s: "thread force mitigated");
351 break;
352 case PR_SPEC_PRCTL | PR_SPEC_DISABLE:
353 seq_puts(m, s: "thread mitigated");
354 break;
355 case PR_SPEC_PRCTL | PR_SPEC_ENABLE:
356 seq_puts(m, s: "thread vulnerable");
357 break;
358 case PR_SPEC_DISABLE:
359 seq_puts(m, s: "globally mitigated");
360 break;
361 default:
362 seq_puts(m, s: "vulnerable");
363 break;
364 }
365
366 seq_puts(m, s: "\nSpeculationIndirectBranch:\t");
367 switch (arch_prctl_spec_ctrl_get(task: p, PR_SPEC_INDIRECT_BRANCH)) {
368 case -EINVAL:
369 seq_puts(m, s: "unsupported");
370 break;
371 case PR_SPEC_NOT_AFFECTED:
372 seq_puts(m, s: "not affected");
373 break;
374 case PR_SPEC_PRCTL | PR_SPEC_FORCE_DISABLE:
375 seq_puts(m, s: "conditional force disabled");
376 break;
377 case PR_SPEC_PRCTL | PR_SPEC_DISABLE:
378 seq_puts(m, s: "conditional disabled");
379 break;
380 case PR_SPEC_PRCTL | PR_SPEC_ENABLE:
381 seq_puts(m, s: "conditional enabled");
382 break;
383 case PR_SPEC_ENABLE:
384 seq_puts(m, s: "always enabled");
385 break;
386 case PR_SPEC_DISABLE:
387 seq_puts(m, s: "always disabled");
388 break;
389 default:
390 seq_puts(m, s: "unknown");
391 break;
392 }
393 seq_putc(m, c: '\n');
394}
395
396static inline void task_context_switch_counts(struct seq_file *m,
397 struct task_struct *p)
398{
399 seq_put_decimal_ull(m, delimiter: "voluntary_ctxt_switches:\t", num: p->nvcsw);
400 seq_put_decimal_ull(m, delimiter: "\nnonvoluntary_ctxt_switches:\t", num: p->nivcsw);
401 seq_putc(m, c: '\n');
402}
403
404static void task_cpus_allowed(struct seq_file *m, struct task_struct *task)
405{
406 seq_printf(m, fmt: "Cpus_allowed:\t%*pb\n",
407 cpumask_pr_args(&task->cpus_mask));
408 seq_printf(m, fmt: "Cpus_allowed_list:\t%*pbl\n",
409 cpumask_pr_args(&task->cpus_mask));
410}
411
412static inline void task_core_dumping(struct seq_file *m, struct task_struct *task)
413{
414 seq_put_decimal_ull(m, delimiter: "CoreDumping:\t", num: !!task->signal->core_state);
415 seq_putc(m, c: '\n');
416}
417
418static inline void task_thp_status(struct seq_file *m, struct mm_struct *mm)
419{
420 bool thp_enabled = IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE);
421
422 if (thp_enabled)
423 thp_enabled = !mm_flags_test(MMF_DISABLE_THP_COMPLETELY, mm);
424 seq_printf(m, fmt: "THP_enabled:\t%d\n", thp_enabled);
425}
426
427static inline void task_untag_mask(struct seq_file *m, struct mm_struct *mm)
428{
429 seq_printf(m, fmt: "untag_mask:\t%#lx\n", mm_untag_mask(mm));
430}
431
432__weak void arch_proc_pid_thread_features(struct seq_file *m,
433 struct task_struct *task)
434{
435}
436
437int proc_pid_status(struct seq_file *m, struct pid_namespace *ns,
438 struct pid *pid, struct task_struct *task)
439{
440 struct mm_struct *mm = get_task_mm(task);
441
442 seq_puts(m, s: "Name:\t");
443 proc_task_name(m, p: task, escape: true);
444 seq_putc(m, c: '\n');
445
446 task_state(m, ns, pid, p: task);
447
448 if (mm) {
449 task_mem(m, mm);
450 task_core_dumping(m, task);
451 task_thp_status(m, mm);
452 task_untag_mask(m, mm);
453 mmput(mm);
454 }
455 task_sig(m, p: task);
456 task_cap(m, p: task);
457 task_seccomp(m, p: task);
458 task_cpus_allowed(m, task);
459 cpuset_task_status_allowed(m, task);
460 task_context_switch_counts(m, p: task);
461 arch_proc_pid_thread_features(m, task);
462 return 0;
463}
464
465static int do_task_stat(struct seq_file *m, struct pid_namespace *ns,
466 struct pid *pid, struct task_struct *task, int whole)
467{
468 unsigned long vsize, eip, esp, wchan = 0;
469 int priority, nice;
470 int tty_pgrp = -1, tty_nr = 0;
471 sigset_t sigign, sigcatch;
472 char state;
473 pid_t ppid = 0, pgid = -1, sid = -1;
474 int num_threads = 0;
475 int permitted;
476 struct mm_struct *mm;
477 unsigned long long start_time;
478 unsigned long cmin_flt, cmaj_flt, min_flt, maj_flt;
479 u64 cutime, cstime, cgtime, utime, stime, gtime;
480 unsigned long rsslim = 0;
481 unsigned long flags;
482 int exit_code = task->exit_code;
483 struct signal_struct *sig = task->signal;
484
485 state = *get_task_state(tsk: task);
486 vsize = eip = esp = 0;
487 permitted = ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS | PTRACE_MODE_NOAUDIT);
488 mm = get_task_mm(task);
489 if (mm) {
490 vsize = task_vsize(mm);
491 /*
492 * esp and eip are intentionally zeroed out. There is no
493 * non-racy way to read them without freezing the task.
494 * Programs that need reliable values can use ptrace(2).
495 *
496 * The only exception is if the task is core dumping because
497 * a program is not able to use ptrace(2) in that case. It is
498 * safe because the task has stopped executing permanently.
499 */
500 if (permitted && (task->flags & (PF_EXITING|PF_DUMPCORE|PF_POSTCOREDUMP))) {
501 if (try_get_task_stack(tsk: task)) {
502 eip = KSTK_EIP(task);
503 esp = KSTK_ESP(task);
504 put_task_stack(tsk: task);
505 }
506 }
507 }
508
509 sigemptyset(set: &sigign);
510 sigemptyset(set: &sigcatch);
511
512 if (lock_task_sighand(task, flags: &flags)) {
513 if (sig->tty) {
514 struct pid *pgrp = tty_get_pgrp(tty: sig->tty);
515 tty_pgrp = pid_nr_ns(pid: pgrp, ns);
516 put_pid(pid: pgrp);
517 tty_nr = new_encode_dev(dev: tty_devnum(tty: sig->tty));
518 }
519
520 num_threads = get_nr_threads(task);
521 collect_sigign_sigcatch(p: task, sigign: &sigign, sigcatch: &sigcatch);
522
523 rsslim = READ_ONCE(sig->rlim[RLIMIT_RSS].rlim_cur);
524
525 if (whole) {
526 if (sig->flags & (SIGNAL_GROUP_EXIT | SIGNAL_STOP_STOPPED))
527 exit_code = sig->group_exit_code;
528 }
529
530 sid = task_session_nr_ns(tsk: task, ns);
531 ppid = task_tgid_nr_ns(tsk: task->real_parent, ns);
532 pgid = task_pgrp_nr_ns(tsk: task, ns);
533
534 unlock_task_sighand(task, flags: &flags);
535 }
536
537 if (permitted && (!whole || num_threads < 2))
538 wchan = !task_is_running(task);
539
540 scoped_guard(rcu) {
541 scoped_seqlock_read (&sig->stats_lock, ss_lock_irqsave) {
542 cmin_flt = sig->cmin_flt;
543 cmaj_flt = sig->cmaj_flt;
544 cutime = sig->cutime;
545 cstime = sig->cstime;
546 cgtime = sig->cgtime;
547
548 if (whole) {
549 struct task_struct *t;
550
551 min_flt = sig->min_flt;
552 maj_flt = sig->maj_flt;
553 gtime = sig->gtime;
554
555 __for_each_thread(sig, t) {
556 min_flt += t->min_flt;
557 maj_flt += t->maj_flt;
558 gtime += task_gtime(t);
559 }
560 }
561 }
562 }
563
564 if (whole) {
565 thread_group_cputime_adjusted(p: task, ut: &utime, st: &stime);
566 } else {
567 task_cputime_adjusted(p: task, ut: &utime, st: &stime);
568 min_flt = task->min_flt;
569 maj_flt = task->maj_flt;
570 gtime = task_gtime(t: task);
571 }
572
573 /* scale priority and nice values from timeslices to -20..20 */
574 /* to make it look like a "normal" Unix priority/nice value */
575 priority = task_prio(p: task);
576 nice = task_nice(p: task);
577
578 /* apply timens offset for boottime and convert nsec -> ticks */
579 start_time =
580 nsec_to_clock_t(x: timens_add_boottime_ns(nsec: task->start_boottime));
581
582 seq_put_decimal_ull(m, delimiter: "", num: pid_nr_ns(pid, ns));
583 seq_puts(m, s: " (");
584 proc_task_name(m, p: task, escape: false);
585 seq_puts(m, s: ") ");
586 seq_putc(m, c: state);
587 seq_put_decimal_ll(m, delimiter: " ", num: ppid);
588 seq_put_decimal_ll(m, delimiter: " ", num: pgid);
589 seq_put_decimal_ll(m, delimiter: " ", num: sid);
590 seq_put_decimal_ll(m, delimiter: " ", num: tty_nr);
591 seq_put_decimal_ll(m, delimiter: " ", num: tty_pgrp);
592 seq_put_decimal_ull(m, delimiter: " ", num: task->flags);
593 seq_put_decimal_ull(m, delimiter: " ", num: min_flt);
594 seq_put_decimal_ull(m, delimiter: " ", num: cmin_flt);
595 seq_put_decimal_ull(m, delimiter: " ", num: maj_flt);
596 seq_put_decimal_ull(m, delimiter: " ", num: cmaj_flt);
597 seq_put_decimal_ull(m, delimiter: " ", num: nsec_to_clock_t(x: utime));
598 seq_put_decimal_ull(m, delimiter: " ", num: nsec_to_clock_t(x: stime));
599 seq_put_decimal_ll(m, delimiter: " ", num: nsec_to_clock_t(x: cutime));
600 seq_put_decimal_ll(m, delimiter: " ", num: nsec_to_clock_t(x: cstime));
601 seq_put_decimal_ll(m, delimiter: " ", num: priority);
602 seq_put_decimal_ll(m, delimiter: " ", num: nice);
603 seq_put_decimal_ll(m, delimiter: " ", num: num_threads);
604 seq_put_decimal_ull(m, delimiter: " ", num: 0);
605 seq_put_decimal_ull(m, delimiter: " ", num: start_time);
606 seq_put_decimal_ull(m, delimiter: " ", num: vsize);
607 seq_put_decimal_ull(m, delimiter: " ", num: mm ? get_mm_rss(mm) : 0);
608 seq_put_decimal_ull(m, delimiter: " ", num: rsslim);
609 seq_put_decimal_ull(m, delimiter: " ", num: mm ? (permitted ? mm->start_code : 1) : 0);
610 seq_put_decimal_ull(m, delimiter: " ", num: mm ? (permitted ? mm->end_code : 1) : 0);
611 seq_put_decimal_ull(m, delimiter: " ", num: (permitted && mm) ? mm->start_stack : 0);
612 seq_put_decimal_ull(m, delimiter: " ", num: esp);
613 seq_put_decimal_ull(m, delimiter: " ", num: eip);
614 /* The signal information here is obsolete.
615 * It must be decimal for Linux 2.0 compatibility.
616 * Use /proc/#/status for real-time signals.
617 */
618 seq_put_decimal_ull(m, delimiter: " ", num: task->pending.signal.sig[0] & 0x7fffffffUL);
619 seq_put_decimal_ull(m, delimiter: " ", num: task->blocked.sig[0] & 0x7fffffffUL);
620 seq_put_decimal_ull(m, delimiter: " ", num: sigign.sig[0] & 0x7fffffffUL);
621 seq_put_decimal_ull(m, delimiter: " ", num: sigcatch.sig[0] & 0x7fffffffUL);
622
623 /*
624 * We used to output the absolute kernel address, but that's an
625 * information leak - so instead we show a 0/1 flag here, to signal
626 * to user-space whether there's a wchan field in /proc/PID/wchan.
627 *
628 * This works with older implementations of procps as well.
629 */
630 seq_put_decimal_ull(m, delimiter: " ", num: wchan);
631
632 seq_put_decimal_ull(m, delimiter: " ", num: 0);
633 seq_put_decimal_ull(m, delimiter: " ", num: 0);
634 seq_put_decimal_ll(m, delimiter: " ", num: task->exit_signal);
635 seq_put_decimal_ll(m, delimiter: " ", num: task_cpu(p: task));
636 seq_put_decimal_ull(m, delimiter: " ", num: task->rt_priority);
637 seq_put_decimal_ull(m, delimiter: " ", num: task->policy);
638 seq_put_decimal_ull(m, delimiter: " ", num: delayacct_blkio_ticks(tsk: task));
639 seq_put_decimal_ull(m, delimiter: " ", num: nsec_to_clock_t(x: gtime));
640 seq_put_decimal_ll(m, delimiter: " ", num: nsec_to_clock_t(x: cgtime));
641
642 if (mm && permitted) {
643 seq_put_decimal_ull(m, delimiter: " ", num: mm->start_data);
644 seq_put_decimal_ull(m, delimiter: " ", num: mm->end_data);
645 seq_put_decimal_ull(m, delimiter: " ", num: mm->start_brk);
646 seq_put_decimal_ull(m, delimiter: " ", num: mm->arg_start);
647 seq_put_decimal_ull(m, delimiter: " ", num: mm->arg_end);
648 seq_put_decimal_ull(m, delimiter: " ", num: mm->env_start);
649 seq_put_decimal_ull(m, delimiter: " ", num: mm->env_end);
650 } else
651 seq_puts(m, s: " 0 0 0 0 0 0 0");
652
653 if (permitted)
654 seq_put_decimal_ll(m, delimiter: " ", num: exit_code);
655 else
656 seq_puts(m, s: " 0");
657
658 seq_putc(m, c: '\n');
659 if (mm)
660 mmput(mm);
661 return 0;
662}
663
664int proc_tid_stat(struct seq_file *m, struct pid_namespace *ns,
665 struct pid *pid, struct task_struct *task)
666{
667 return do_task_stat(m, ns, pid, task, whole: 0);
668}
669
670int proc_tgid_stat(struct seq_file *m, struct pid_namespace *ns,
671 struct pid *pid, struct task_struct *task)
672{
673 return do_task_stat(m, ns, pid, task, whole: 1);
674}
675
676int proc_pid_statm(struct seq_file *m, struct pid_namespace *ns,
677 struct pid *pid, struct task_struct *task)
678{
679 struct mm_struct *mm = get_task_mm(task);
680
681 if (mm) {
682 unsigned long size;
683 unsigned long resident = 0;
684 unsigned long shared = 0;
685 unsigned long text = 0;
686 unsigned long data = 0;
687
688 size = task_statm(mm, &shared, &text, &data, &resident);
689 mmput(mm);
690
691 /*
692 * For quick read, open code by putting numbers directly
693 * expected format is
694 * seq_printf(m, "%lu %lu %lu %lu 0 %lu 0\n",
695 * size, resident, shared, text, data);
696 */
697 seq_put_decimal_ull(m, delimiter: "", num: size);
698 seq_put_decimal_ull(m, delimiter: " ", num: resident);
699 seq_put_decimal_ull(m, delimiter: " ", num: shared);
700 seq_put_decimal_ull(m, delimiter: " ", num: text);
701 seq_put_decimal_ull(m, delimiter: " ", num: 0);
702 seq_put_decimal_ull(m, delimiter: " ", num: data);
703 seq_put_decimal_ull(m, delimiter: " ", num: 0);
704 seq_putc(m, c: '\n');
705 } else {
706 seq_write(seq: m, data: "0 0 0 0 0 0 0\n", len: 14);
707 }
708 return 0;
709}
710
711#ifdef CONFIG_PROC_CHILDREN
712static struct pid *
713get_children_pid(struct inode *inode, struct pid *pid_prev, loff_t pos)
714{
715 struct task_struct *start, *task;
716 struct pid *pid = NULL;
717
718 read_lock(&tasklist_lock);
719
720 start = pid_task(pid: proc_pid(inode), PIDTYPE_PID);
721 if (!start)
722 goto out;
723
724 /*
725 * Lets try to continue searching first, this gives
726 * us significant speedup on children-rich processes.
727 */
728 if (pid_prev) {
729 task = pid_task(pid: pid_prev, PIDTYPE_PID);
730 if (task && task->real_parent == start &&
731 !(list_empty(head: &task->sibling))) {
732 if (list_is_last(list: &task->sibling, head: &start->children))
733 goto out;
734 task = list_first_entry(&task->sibling,
735 struct task_struct, sibling);
736 pid = get_pid(pid: task_pid(task));
737 goto out;
738 }
739 }
740
741 /*
742 * Slow search case.
743 *
744 * We might miss some children here if children
745 * are exited while we were not holding the lock,
746 * but it was never promised to be accurate that
747 * much.
748 *
749 * "Just suppose that the parent sleeps, but N children
750 * exit after we printed their tids. Now the slow paths
751 * skips N extra children, we miss N tasks." (c)
752 *
753 * So one need to stop or freeze the leader and all
754 * its children to get a precise result.
755 */
756 list_for_each_entry(task, &start->children, sibling) {
757 if (pos-- == 0) {
758 pid = get_pid(pid: task_pid(task));
759 break;
760 }
761 }
762
763out:
764 read_unlock(&tasklist_lock);
765 return pid;
766}
767
768static int children_seq_show(struct seq_file *seq, void *v)
769{
770 struct inode *inode = file_inode(f: seq->file);
771
772 seq_printf(m: seq, fmt: "%d ", pid_nr_ns(pid: v, ns: proc_pid_ns(sb: inode->i_sb)));
773 return 0;
774}
775
776static void *children_seq_start(struct seq_file *seq, loff_t *pos)
777{
778 return get_children_pid(inode: file_inode(f: seq->file), NULL, pos: *pos);
779}
780
781static void *children_seq_next(struct seq_file *seq, void *v, loff_t *pos)
782{
783 struct pid *pid;
784
785 pid = get_children_pid(inode: file_inode(f: seq->file), pid_prev: v, pos: *pos + 1);
786 put_pid(pid: v);
787
788 ++*pos;
789 return pid;
790}
791
792static void children_seq_stop(struct seq_file *seq, void *v)
793{
794 put_pid(pid: v);
795}
796
797static const struct seq_operations children_seq_ops = {
798 .start = children_seq_start,
799 .next = children_seq_next,
800 .stop = children_seq_stop,
801 .show = children_seq_show,
802};
803
804static int children_seq_open(struct inode *inode, struct file *file)
805{
806 return seq_open(file, &children_seq_ops);
807}
808
809const struct file_operations proc_tid_children_operations = {
810 .open = children_seq_open,
811 .read = seq_read,
812 .llseek = seq_lseek,
813 .release = seq_release,
814};
815#endif /* CONFIG_PROC_CHILDREN */
816

source code of linux/fs/proc/array.c