1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * linux/fs/proc/array.c
4 *
5 * Copyright (C) 1992 by Linus Torvalds
6 * based on ideas by Darren Senn
7 *
8 * Fixes:
9 * Michael. K. Johnson: stat,statm extensions.
10 * <johnsonm@stolaf.edu>
11 *
12 * Pauline Middelink : Made cmdline,envline only break at '\0's, to
13 * make sure SET_PROCTITLE works. Also removed
14 * bad '!' which forced address recalculation for
15 * EVERY character on the current page.
16 * <middelin@polyware.iaf.nl>
17 *
18 * Danny ter Haar : added cpuinfo
19 * <dth@cistron.nl>
20 *
21 * Alessandro Rubini : profile extension.
22 * <rubini@ipvvis.unipv.it>
23 *
24 * Jeff Tranter : added BogoMips field to cpuinfo
25 * <Jeff_Tranter@Mitel.COM>
26 *
27 * Bruno Haible : remove 4K limit for the maps file
28 * <haible@ma2s2.mathematik.uni-karlsruhe.de>
29 *
30 * Yves Arrouye : remove removal of trailing spaces in get_array.
31 * <Yves.Arrouye@marin.fdn.fr>
32 *
33 * Jerome Forissier : added per-CPU time information to /proc/stat
34 * and /proc/<pid>/cpu extension
35 * <forissier@isia.cma.fr>
36 * - Incorporation and non-SMP safe operation
37 * of forissier patch in 2.1.78 by
38 * Hans Marcus <crowbar@concepts.nl>
39 *
40 * aeb@cwi.nl : /proc/partitions
41 *
42 *
43 * Alan Cox : security fixes.
44 * <alan@lxorguk.ukuu.org.uk>
45 *
46 * Al Viro : safe handling of mm_struct
47 *
48 * Gerhard Wichert : added BIGMEM support
49 * Siemens AG <Gerhard.Wichert@pdb.siemens.de>
50 *
51 * Al Viro & Jeff Garzik : moved most of the thing into base.c and
52 * : proc_misc.c. The rest may eventually go into
53 * : base.c too.
54 */
55
56 #include <linux/types.h>
57 #include <linux/errno.h>
58 #include <linux/time.h>
59 #include <linux/kernel.h>
60 #include <linux/kernel_stat.h>
61 #include <linux/tty.h>
62 #include <linux/string.h>
63 #include <linux/mman.h>
64 #include <linux/sched/mm.h>
65 #include <linux/sched/numa_balancing.h>
66 #include <linux/sched/task_stack.h>
67 #include <linux/sched/task.h>
68 #include <linux/sched/cputime.h>
69 #include <linux/proc_fs.h>
70 #include <linux/ioport.h>
71 #include <linux/uaccess.h>
72 #include <linux/io.h>
73 #include <linux/mm.h>
74 #include <linux/hugetlb.h>
75 #include <linux/pagemap.h>
76 #include <linux/swap.h>
77 #include <linux/smp.h>
78 #include <linux/signal.h>
79 #include <linux/highmem.h>
80 #include <linux/file.h>
81 #include <linux/fdtable.h>
82 #include <linux/times.h>
83 #include <linux/cpuset.h>
84 #include <linux/rcupdate.h>
85 #include <linux/delayacct.h>
86 #include <linux/seq_file.h>
87 #include <linux/pid_namespace.h>
88 #include <linux/prctl.h>
89 #include <linux/ptrace.h>
90 #include <linux/tracehook.h>
91 #include <linux/string_helpers.h>
92 #include <linux/user_namespace.h>
93 #include <linux/fs_struct.h>
94
95 #include <asm/processor.h>
96 #include "internal.h"
97
proc_task_name(struct seq_file * m,struct task_struct * p,bool escape)98 void proc_task_name(struct seq_file *m, struct task_struct *p, bool escape)
99 {
100 char *buf;
101 size_t size;
102 char tcomm[64];
103 int ret;
104
105 if (p->flags & PF_WQ_WORKER)
106 wq_worker_comm(tcomm, sizeof(tcomm), p);
107 else
108 __get_task_comm(tcomm, sizeof(tcomm), p);
109
110 size = seq_get_buf(m, &buf);
111 if (escape) {
112 ret = string_escape_str(tcomm, buf, size,
113 ESCAPE_SPACE | ESCAPE_SPECIAL, "\n\\");
114 if (ret >= size)
115 ret = -1;
116 } else {
117 ret = strscpy(buf, tcomm, size);
118 }
119
120 seq_commit(m, ret);
121 }
122
123 /*
124 * The task state array is a strange "bitmap" of
125 * reasons to sleep. Thus "running" is zero, and
126 * you can test for combinations of others with
127 * simple bit tests.
128 */
129 static const char * const task_state_array[] = {
130
131 /* states in TASK_REPORT: */
132 "R (running)", /* 0x00 */
133 "S (sleeping)", /* 0x01 */
134 "D (disk sleep)", /* 0x02 */
135 "T (stopped)", /* 0x04 */
136 "t (tracing stop)", /* 0x08 */
137 "X (dead)", /* 0x10 */
138 "Z (zombie)", /* 0x20 */
139 "P (parked)", /* 0x40 */
140
141 /* states beyond TASK_REPORT: */
142 "I (idle)", /* 0x80 */
143 };
144
get_task_state(struct task_struct * tsk)145 static inline const char *get_task_state(struct task_struct *tsk)
146 {
147 BUILD_BUG_ON(1 + ilog2(TASK_REPORT_MAX) != ARRAY_SIZE(task_state_array));
148 return task_state_array[task_state_index(tsk)];
149 }
150
task_state(struct seq_file * m,struct pid_namespace * ns,struct pid * pid,struct task_struct * p)151 static inline void task_state(struct seq_file *m, struct pid_namespace *ns,
152 struct pid *pid, struct task_struct *p)
153 {
154 struct user_namespace *user_ns = seq_user_ns(m);
155 struct group_info *group_info;
156 int g, umask = -1;
157 struct task_struct *tracer;
158 const struct cred *cred;
159 pid_t ppid, tpid = 0, tgid, ngid;
160 unsigned int max_fds = 0;
161
162 rcu_read_lock();
163 ppid = pid_alive(p) ?
164 task_tgid_nr_ns(rcu_dereference(p->real_parent), ns) : 0;
165
166 tracer = ptrace_parent(p);
167 if (tracer)
168 tpid = task_pid_nr_ns(tracer, ns);
169
170 tgid = task_tgid_nr_ns(p, ns);
171 ngid = task_numa_group_id(p);
172 cred = get_task_cred(p);
173
174 task_lock(p);
175 if (p->fs)
176 umask = p->fs->umask;
177 if (p->files)
178 max_fds = files_fdtable(p->files)->max_fds;
179 task_unlock(p);
180 rcu_read_unlock();
181
182 if (umask >= 0)
183 seq_printf(m, "Umask:\t%#04o\n", umask);
184 seq_puts(m, "State:\t");
185 seq_puts(m, get_task_state(p));
186
187 seq_put_decimal_ull(m, "\nTgid:\t", tgid);
188 seq_put_decimal_ull(m, "\nNgid:\t", ngid);
189 seq_put_decimal_ull(m, "\nPid:\t", pid_nr_ns(pid, ns));
190 seq_put_decimal_ull(m, "\nPPid:\t", ppid);
191 seq_put_decimal_ull(m, "\nTracerPid:\t", tpid);
192 seq_put_decimal_ull(m, "\nUid:\t", from_kuid_munged(user_ns, cred->uid));
193 seq_put_decimal_ull(m, "\t", from_kuid_munged(user_ns, cred->euid));
194 seq_put_decimal_ull(m, "\t", from_kuid_munged(user_ns, cred->suid));
195 seq_put_decimal_ull(m, "\t", from_kuid_munged(user_ns, cred->fsuid));
196 seq_put_decimal_ull(m, "\nGid:\t", from_kgid_munged(user_ns, cred->gid));
197 seq_put_decimal_ull(m, "\t", from_kgid_munged(user_ns, cred->egid));
198 seq_put_decimal_ull(m, "\t", from_kgid_munged(user_ns, cred->sgid));
199 seq_put_decimal_ull(m, "\t", from_kgid_munged(user_ns, cred->fsgid));
200 seq_put_decimal_ull(m, "\nFDSize:\t", max_fds);
201
202 seq_puts(m, "\nGroups:\t");
203 group_info = cred->group_info;
204 for (g = 0; g < group_info->ngroups; g++)
205 seq_put_decimal_ull(m, g ? " " : "",
206 from_kgid_munged(user_ns, group_info->gid[g]));
207 put_cred(cred);
208 /* Trailing space shouldn't have been added in the first place. */
209 seq_putc(m, ' ');
210
211 #ifdef CONFIG_PID_NS
212 seq_puts(m, "\nNStgid:");
213 for (g = ns->level; g <= pid->level; g++)
214 seq_put_decimal_ull(m, "\t", task_tgid_nr_ns(p, pid->numbers[g].ns));
215 seq_puts(m, "\nNSpid:");
216 for (g = ns->level; g <= pid->level; g++)
217 seq_put_decimal_ull(m, "\t", task_pid_nr_ns(p, pid->numbers[g].ns));
218 seq_puts(m, "\nNSpgid:");
219 for (g = ns->level; g <= pid->level; g++)
220 seq_put_decimal_ull(m, "\t", task_pgrp_nr_ns(p, pid->numbers[g].ns));
221 seq_puts(m, "\nNSsid:");
222 for (g = ns->level; g <= pid->level; g++)
223 seq_put_decimal_ull(m, "\t", task_session_nr_ns(p, pid->numbers[g].ns));
224 #endif
225 seq_putc(m, '\n');
226 }
227
render_sigset_t(struct seq_file * m,const char * header,sigset_t * set)228 void render_sigset_t(struct seq_file *m, const char *header,
229 sigset_t *set)
230 {
231 int i;
232
233 seq_puts(m, header);
234
235 i = _NSIG;
236 do {
237 int x = 0;
238
239 i -= 4;
240 if (sigismember(set, i+1)) x |= 1;
241 if (sigismember(set, i+2)) x |= 2;
242 if (sigismember(set, i+3)) x |= 4;
243 if (sigismember(set, i+4)) x |= 8;
244 seq_putc(m, hex_asc[x]);
245 } while (i >= 4);
246
247 seq_putc(m, '\n');
248 }
249
collect_sigign_sigcatch(struct task_struct * p,sigset_t * sigign,sigset_t * sigcatch)250 static void collect_sigign_sigcatch(struct task_struct *p, sigset_t *sigign,
251 sigset_t *sigcatch)
252 {
253 struct k_sigaction *k;
254 int i;
255
256 k = p->sighand->action;
257 for (i = 1; i <= _NSIG; ++i, ++k) {
258 if (k->sa.sa_handler == SIG_IGN)
259 sigaddset(sigign, i);
260 else if (k->sa.sa_handler != SIG_DFL)
261 sigaddset(sigcatch, i);
262 }
263 }
264
task_sig(struct seq_file * m,struct task_struct * p)265 static inline void task_sig(struct seq_file *m, struct task_struct *p)
266 {
267 unsigned long flags;
268 sigset_t pending, shpending, blocked, ignored, caught;
269 int num_threads = 0;
270 unsigned int qsize = 0;
271 unsigned long qlim = 0;
272
273 sigemptyset(&pending);
274 sigemptyset(&shpending);
275 sigemptyset(&blocked);
276 sigemptyset(&ignored);
277 sigemptyset(&caught);
278
279 if (lock_task_sighand(p, &flags)) {
280 pending = p->pending.signal;
281 shpending = p->signal->shared_pending.signal;
282 blocked = p->blocked;
283 collect_sigign_sigcatch(p, &ignored, &caught);
284 num_threads = get_nr_threads(p);
285 rcu_read_lock(); /* FIXME: is this correct? */
286 qsize = atomic_read(&__task_cred(p)->user->sigpending);
287 rcu_read_unlock();
288 qlim = task_rlimit(p, RLIMIT_SIGPENDING);
289 unlock_task_sighand(p, &flags);
290 }
291
292 seq_put_decimal_ull(m, "Threads:\t", num_threads);
293 seq_put_decimal_ull(m, "\nSigQ:\t", qsize);
294 seq_put_decimal_ull(m, "/", qlim);
295
296 /* render them all */
297 render_sigset_t(m, "\nSigPnd:\t", &pending);
298 render_sigset_t(m, "ShdPnd:\t", &shpending);
299 render_sigset_t(m, "SigBlk:\t", &blocked);
300 render_sigset_t(m, "SigIgn:\t", &ignored);
301 render_sigset_t(m, "SigCgt:\t", &caught);
302 }
303
render_cap_t(struct seq_file * m,const char * header,kernel_cap_t * a)304 static void render_cap_t(struct seq_file *m, const char *header,
305 kernel_cap_t *a)
306 {
307 unsigned __capi;
308
309 seq_puts(m, header);
310 CAP_FOR_EACH_U32(__capi) {
311 seq_put_hex_ll(m, NULL,
312 a->cap[CAP_LAST_U32 - __capi], 8);
313 }
314 seq_putc(m, '\n');
315 }
316
task_cap(struct seq_file * m,struct task_struct * p)317 static inline void task_cap(struct seq_file *m, struct task_struct *p)
318 {
319 const struct cred *cred;
320 kernel_cap_t cap_inheritable, cap_permitted, cap_effective,
321 cap_bset, cap_ambient;
322
323 rcu_read_lock();
324 cred = __task_cred(p);
325 cap_inheritable = cred->cap_inheritable;
326 cap_permitted = cred->cap_permitted;
327 cap_effective = cred->cap_effective;
328 cap_bset = cred->cap_bset;
329 cap_ambient = cred->cap_ambient;
330 rcu_read_unlock();
331
332 render_cap_t(m, "CapInh:\t", &cap_inheritable);
333 render_cap_t(m, "CapPrm:\t", &cap_permitted);
334 render_cap_t(m, "CapEff:\t", &cap_effective);
335 render_cap_t(m, "CapBnd:\t", &cap_bset);
336 render_cap_t(m, "CapAmb:\t", &cap_ambient);
337 }
338
task_seccomp(struct seq_file * m,struct task_struct * p)339 static inline void task_seccomp(struct seq_file *m, struct task_struct *p)
340 {
341 seq_put_decimal_ull(m, "NoNewPrivs:\t", task_no_new_privs(p));
342 #ifdef CONFIG_SECCOMP
343 seq_put_decimal_ull(m, "\nSeccomp:\t", p->seccomp.mode);
344 #ifdef CONFIG_SECCOMP_FILTER
345 seq_put_decimal_ull(m, "\nSeccomp_filters:\t",
346 atomic_read(&p->seccomp.filter_count));
347 #endif
348 #endif
349 seq_puts(m, "\nSpeculation_Store_Bypass:\t");
350 switch (arch_prctl_spec_ctrl_get(p, PR_SPEC_STORE_BYPASS)) {
351 case -EINVAL:
352 seq_puts(m, "unknown");
353 break;
354 case PR_SPEC_NOT_AFFECTED:
355 seq_puts(m, "not vulnerable");
356 break;
357 case PR_SPEC_PRCTL | PR_SPEC_FORCE_DISABLE:
358 seq_puts(m, "thread force mitigated");
359 break;
360 case PR_SPEC_PRCTL | PR_SPEC_DISABLE:
361 seq_puts(m, "thread mitigated");
362 break;
363 case PR_SPEC_PRCTL | PR_SPEC_ENABLE:
364 seq_puts(m, "thread vulnerable");
365 break;
366 case PR_SPEC_DISABLE:
367 seq_puts(m, "globally mitigated");
368 break;
369 default:
370 seq_puts(m, "vulnerable");
371 break;
372 }
373 seq_putc(m, '\n');
374 }
375
task_context_switch_counts(struct seq_file * m,struct task_struct * p)376 static inline void task_context_switch_counts(struct seq_file *m,
377 struct task_struct *p)
378 {
379 seq_put_decimal_ull(m, "voluntary_ctxt_switches:\t", p->nvcsw);
380 seq_put_decimal_ull(m, "\nnonvoluntary_ctxt_switches:\t", p->nivcsw);
381 seq_putc(m, '\n');
382 }
383
task_cpus_allowed(struct seq_file * m,struct task_struct * task)384 static void task_cpus_allowed(struct seq_file *m, struct task_struct *task)
385 {
386 seq_printf(m, "Cpus_allowed:\t%*pb\n",
387 cpumask_pr_args(task->cpus_ptr));
388 seq_printf(m, "Cpus_allowed_list:\t%*pbl\n",
389 cpumask_pr_args(task->cpus_ptr));
390 }
391
task_core_dumping(struct seq_file * m,struct mm_struct * mm)392 static inline void task_core_dumping(struct seq_file *m, struct mm_struct *mm)
393 {
394 seq_put_decimal_ull(m, "CoreDumping:\t", !!mm->core_state);
395 seq_putc(m, '\n');
396 }
397
task_thp_status(struct seq_file * m,struct mm_struct * mm)398 static inline void task_thp_status(struct seq_file *m, struct mm_struct *mm)
399 {
400 bool thp_enabled = IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE);
401
402 if (thp_enabled)
403 thp_enabled = !test_bit(MMF_DISABLE_THP, &mm->flags);
404 seq_printf(m, "THP_enabled:\t%d\n", thp_enabled);
405 }
406
proc_pid_status(struct seq_file * m,struct pid_namespace * ns,struct pid * pid,struct task_struct * task)407 int proc_pid_status(struct seq_file *m, struct pid_namespace *ns,
408 struct pid *pid, struct task_struct *task)
409 {
410 struct mm_struct *mm = get_task_mm(task);
411
412 seq_puts(m, "Name:\t");
413 proc_task_name(m, task, true);
414 seq_putc(m, '\n');
415
416 task_state(m, ns, pid, task);
417
418 if (mm) {
419 task_mem(m, mm);
420 task_core_dumping(m, mm);
421 task_thp_status(m, mm);
422 mmput(mm);
423 }
424 task_sig(m, task);
425 task_cap(m, task);
426 task_seccomp(m, task);
427 task_cpus_allowed(m, task);
428 cpuset_task_status_allowed(m, task);
429 task_context_switch_counts(m, task);
430 return 0;
431 }
432
do_task_stat(struct seq_file * m,struct pid_namespace * ns,struct pid * pid,struct task_struct * task,int whole)433 static int do_task_stat(struct seq_file *m, struct pid_namespace *ns,
434 struct pid *pid, struct task_struct *task, int whole)
435 {
436 unsigned long vsize, eip, esp, wchan = 0;
437 int priority, nice;
438 int tty_pgrp = -1, tty_nr = 0;
439 sigset_t sigign, sigcatch;
440 char state;
441 pid_t ppid = 0, pgid = -1, sid = -1;
442 int num_threads = 0;
443 int permitted;
444 struct mm_struct *mm;
445 unsigned long long start_time;
446 unsigned long cmin_flt, cmaj_flt, min_flt, maj_flt;
447 u64 cutime, cstime, cgtime, utime, stime, gtime;
448 unsigned long rsslim = 0;
449 unsigned long flags;
450 int exit_code = task->exit_code;
451 struct signal_struct *sig = task->signal;
452 unsigned int seq = 1;
453
454 state = *get_task_state(task);
455 vsize = eip = esp = 0;
456 permitted = ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS | PTRACE_MODE_NOAUDIT);
457 mm = get_task_mm(task);
458 if (mm) {
459 vsize = task_vsize(mm);
460 /*
461 * esp and eip are intentionally zeroed out. There is no
462 * non-racy way to read them without freezing the task.
463 * Programs that need reliable values can use ptrace(2).
464 *
465 * The only exception is if the task is core dumping because
466 * a program is not able to use ptrace(2) in that case. It is
467 * safe because the task has stopped executing permanently.
468 */
469 if (permitted && (task->flags & (PF_EXITING|PF_DUMPCORE))) {
470 if (try_get_task_stack(task)) {
471 eip = KSTK_EIP(task);
472 esp = KSTK_ESP(task);
473 put_task_stack(task);
474 }
475 }
476 }
477
478 sigemptyset(&sigign);
479 sigemptyset(&sigcatch);
480
481 if (lock_task_sighand(task, &flags)) {
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 rsslim = READ_ONCE(sig->rlim[RLIMIT_RSS].rlim_cur);
493
494 if (whole) {
495 if (sig->flags & (SIGNAL_GROUP_EXIT | SIGNAL_STOP_STOPPED))
496 exit_code = sig->group_exit_code;
497 }
498
499 sid = task_session_nr_ns(task, ns);
500 ppid = task_tgid_nr_ns(task->real_parent, ns);
501 pgid = task_pgrp_nr_ns(task, ns);
502
503 unlock_task_sighand(task, &flags);
504 }
505
506 if (permitted && (!whole || num_threads < 2))
507 wchan = get_wchan(task);
508
509 do {
510 seq++; /* 2 on the 1st/lockless path, otherwise odd */
511 flags = read_seqbegin_or_lock_irqsave(&sig->stats_lock, &seq);
512
513 cmin_flt = sig->cmin_flt;
514 cmaj_flt = sig->cmaj_flt;
515 cutime = sig->cutime;
516 cstime = sig->cstime;
517 cgtime = sig->cgtime;
518
519 if (whole) {
520 struct task_struct *t;
521
522 min_flt = sig->min_flt;
523 maj_flt = sig->maj_flt;
524 gtime = sig->gtime;
525
526 rcu_read_lock();
527 __for_each_thread(sig, t) {
528 min_flt += t->min_flt;
529 maj_flt += t->maj_flt;
530 gtime += task_gtime(t);
531 }
532 rcu_read_unlock();
533 }
534 } while (need_seqretry(&sig->stats_lock, seq));
535 done_seqretry_irqrestore(&sig->stats_lock, seq, flags);
536
537 if (whole) {
538 thread_group_cputime_adjusted(task, &utime, &stime);
539 } else {
540 task_cputime_adjusted(task, &utime, &stime);
541 min_flt = task->min_flt;
542 maj_flt = task->maj_flt;
543 gtime = task_gtime(task);
544 }
545
546 /* scale priority and nice values from timeslices to -20..20 */
547 /* to make it look like a "normal" Unix priority/nice value */
548 priority = task_prio(task);
549 nice = task_nice(task);
550
551 /* convert nsec -> ticks */
552 start_time = nsec_to_clock_t(task->start_boottime);
553
554 seq_put_decimal_ull(m, "", pid_nr_ns(pid, ns));
555 seq_puts(m, " (");
556 proc_task_name(m, task, false);
557 seq_puts(m, ") ");
558 seq_putc(m, state);
559 seq_put_decimal_ll(m, " ", ppid);
560 seq_put_decimal_ll(m, " ", pgid);
561 seq_put_decimal_ll(m, " ", sid);
562 seq_put_decimal_ll(m, " ", tty_nr);
563 seq_put_decimal_ll(m, " ", tty_pgrp);
564 seq_put_decimal_ull(m, " ", task->flags);
565 seq_put_decimal_ull(m, " ", min_flt);
566 seq_put_decimal_ull(m, " ", cmin_flt);
567 seq_put_decimal_ull(m, " ", maj_flt);
568 seq_put_decimal_ull(m, " ", cmaj_flt);
569 seq_put_decimal_ull(m, " ", nsec_to_clock_t(utime));
570 seq_put_decimal_ull(m, " ", nsec_to_clock_t(stime));
571 seq_put_decimal_ll(m, " ", nsec_to_clock_t(cutime));
572 seq_put_decimal_ll(m, " ", nsec_to_clock_t(cstime));
573 seq_put_decimal_ll(m, " ", priority);
574 seq_put_decimal_ll(m, " ", nice);
575 seq_put_decimal_ll(m, " ", num_threads);
576 seq_put_decimal_ull(m, " ", 0);
577 seq_put_decimal_ull(m, " ", start_time);
578 seq_put_decimal_ull(m, " ", vsize);
579 seq_put_decimal_ull(m, " ", mm ? get_mm_rss(mm) : 0);
580 seq_put_decimal_ull(m, " ", rsslim);
581 seq_put_decimal_ull(m, " ", mm ? (permitted ? mm->start_code : 1) : 0);
582 seq_put_decimal_ull(m, " ", mm ? (permitted ? mm->end_code : 1) : 0);
583 seq_put_decimal_ull(m, " ", (permitted && mm) ? mm->start_stack : 0);
584 seq_put_decimal_ull(m, " ", esp);
585 seq_put_decimal_ull(m, " ", eip);
586 /* The signal information here is obsolete.
587 * It must be decimal for Linux 2.0 compatibility.
588 * Use /proc/#/status for real-time signals.
589 */
590 seq_put_decimal_ull(m, " ", task->pending.signal.sig[0] & 0x7fffffffUL);
591 seq_put_decimal_ull(m, " ", task->blocked.sig[0] & 0x7fffffffUL);
592 seq_put_decimal_ull(m, " ", sigign.sig[0] & 0x7fffffffUL);
593 seq_put_decimal_ull(m, " ", sigcatch.sig[0] & 0x7fffffffUL);
594
595 /*
596 * We used to output the absolute kernel address, but that's an
597 * information leak - so instead we show a 0/1 flag here, to signal
598 * to user-space whether there's a wchan field in /proc/PID/wchan.
599 *
600 * This works with older implementations of procps as well.
601 */
602 if (wchan)
603 seq_puts(m, " 1");
604 else
605 seq_puts(m, " 0");
606
607 seq_put_decimal_ull(m, " ", 0);
608 seq_put_decimal_ull(m, " ", 0);
609 seq_put_decimal_ll(m, " ", task->exit_signal);
610 seq_put_decimal_ll(m, " ", task_cpu(task));
611 seq_put_decimal_ull(m, " ", task->rt_priority);
612 seq_put_decimal_ull(m, " ", task->policy);
613 seq_put_decimal_ull(m, " ", delayacct_blkio_ticks(task));
614 seq_put_decimal_ull(m, " ", nsec_to_clock_t(gtime));
615 seq_put_decimal_ll(m, " ", nsec_to_clock_t(cgtime));
616
617 if (mm && permitted) {
618 seq_put_decimal_ull(m, " ", mm->start_data);
619 seq_put_decimal_ull(m, " ", mm->end_data);
620 seq_put_decimal_ull(m, " ", mm->start_brk);
621 seq_put_decimal_ull(m, " ", mm->arg_start);
622 seq_put_decimal_ull(m, " ", mm->arg_end);
623 seq_put_decimal_ull(m, " ", mm->env_start);
624 seq_put_decimal_ull(m, " ", mm->env_end);
625 } else
626 seq_puts(m, " 0 0 0 0 0 0 0");
627
628 if (permitted)
629 seq_put_decimal_ll(m, " ", exit_code);
630 else
631 seq_puts(m, " 0");
632
633 seq_putc(m, '\n');
634 if (mm)
635 mmput(mm);
636 return 0;
637 }
638
proc_tid_stat(struct seq_file * m,struct pid_namespace * ns,struct pid * pid,struct task_struct * task)639 int proc_tid_stat(struct seq_file *m, struct pid_namespace *ns,
640 struct pid *pid, struct task_struct *task)
641 {
642 return do_task_stat(m, ns, pid, task, 0);
643 }
644
proc_tgid_stat(struct seq_file * m,struct pid_namespace * ns,struct pid * pid,struct task_struct * task)645 int proc_tgid_stat(struct seq_file *m, struct pid_namespace *ns,
646 struct pid *pid, struct task_struct *task)
647 {
648 return do_task_stat(m, ns, pid, task, 1);
649 }
650
proc_pid_statm(struct seq_file * m,struct pid_namespace * ns,struct pid * pid,struct task_struct * task)651 int proc_pid_statm(struct seq_file *m, struct pid_namespace *ns,
652 struct pid *pid, struct task_struct *task)
653 {
654 struct mm_struct *mm = get_task_mm(task);
655
656 if (mm) {
657 unsigned long size;
658 unsigned long resident = 0;
659 unsigned long shared = 0;
660 unsigned long text = 0;
661 unsigned long data = 0;
662
663 size = task_statm(mm, &shared, &text, &data, &resident);
664 mmput(mm);
665
666 /*
667 * For quick read, open code by putting numbers directly
668 * expected format is
669 * seq_printf(m, "%lu %lu %lu %lu 0 %lu 0\n",
670 * size, resident, shared, text, data);
671 */
672 seq_put_decimal_ull(m, "", size);
673 seq_put_decimal_ull(m, " ", resident);
674 seq_put_decimal_ull(m, " ", shared);
675 seq_put_decimal_ull(m, " ", text);
676 seq_put_decimal_ull(m, " ", 0);
677 seq_put_decimal_ull(m, " ", data);
678 seq_put_decimal_ull(m, " ", 0);
679 seq_putc(m, '\n');
680 } else {
681 seq_write(m, "0 0 0 0 0 0 0\n", 14);
682 }
683 return 0;
684 }
685
686 #ifdef CONFIG_PROC_CHILDREN
687 static struct pid *
get_children_pid(struct inode * inode,struct pid * pid_prev,loff_t pos)688 get_children_pid(struct inode *inode, struct pid *pid_prev, loff_t pos)
689 {
690 struct task_struct *start, *task;
691 struct pid *pid = NULL;
692
693 read_lock(&tasklist_lock);
694
695 start = pid_task(proc_pid(inode), PIDTYPE_PID);
696 if (!start)
697 goto out;
698
699 /*
700 * Lets try to continue searching first, this gives
701 * us significant speedup on children-rich processes.
702 */
703 if (pid_prev) {
704 task = pid_task(pid_prev, PIDTYPE_PID);
705 if (task && task->real_parent == start &&
706 !(list_empty(&task->sibling))) {
707 if (list_is_last(&task->sibling, &start->children))
708 goto out;
709 task = list_first_entry(&task->sibling,
710 struct task_struct, sibling);
711 pid = get_pid(task_pid(task));
712 goto out;
713 }
714 }
715
716 /*
717 * Slow search case.
718 *
719 * We might miss some children here if children
720 * are exited while we were not holding the lock,
721 * but it was never promised to be accurate that
722 * much.
723 *
724 * "Just suppose that the parent sleeps, but N children
725 * exit after we printed their tids. Now the slow paths
726 * skips N extra children, we miss N tasks." (c)
727 *
728 * So one need to stop or freeze the leader and all
729 * its children to get a precise result.
730 */
731 list_for_each_entry(task, &start->children, sibling) {
732 if (pos-- == 0) {
733 pid = get_pid(task_pid(task));
734 break;
735 }
736 }
737
738 out:
739 read_unlock(&tasklist_lock);
740 return pid;
741 }
742
children_seq_show(struct seq_file * seq,void * v)743 static int children_seq_show(struct seq_file *seq, void *v)
744 {
745 struct inode *inode = file_inode(seq->file);
746
747 seq_printf(seq, "%d ", pid_nr_ns(v, proc_pid_ns(inode->i_sb)));
748 return 0;
749 }
750
children_seq_start(struct seq_file * seq,loff_t * pos)751 static void *children_seq_start(struct seq_file *seq, loff_t *pos)
752 {
753 return get_children_pid(file_inode(seq->file), NULL, *pos);
754 }
755
children_seq_next(struct seq_file * seq,void * v,loff_t * pos)756 static void *children_seq_next(struct seq_file *seq, void *v, loff_t *pos)
757 {
758 struct pid *pid;
759
760 pid = get_children_pid(file_inode(seq->file), v, *pos + 1);
761 put_pid(v);
762
763 ++*pos;
764 return pid;
765 }
766
children_seq_stop(struct seq_file * seq,void * v)767 static void children_seq_stop(struct seq_file *seq, void *v)
768 {
769 put_pid(v);
770 }
771
772 static const struct seq_operations children_seq_ops = {
773 .start = children_seq_start,
774 .next = children_seq_next,
775 .stop = children_seq_stop,
776 .show = children_seq_show,
777 };
778
children_seq_open(struct inode * inode,struct file * file)779 static int children_seq_open(struct inode *inode, struct file *file)
780 {
781 return seq_open(file, &children_seq_ops);
782 }
783
784 const struct file_operations proc_tid_children_operations = {
785 .open = children_seq_open,
786 .read = seq_read,
787 .llseek = seq_lseek,
788 .release = seq_release,
789 };
790 #endif /* CONFIG_PROC_CHILDREN */
791