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
proc_task_name(struct seq_file * m,struct task_struct * p,bool escape)99 void 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(tcomm, sizeof(tcomm), p);
109 else if (p->flags & PF_KTHREAD)
110 get_kthread_comm(tcomm, sizeof(tcomm), p);
111 else
112 get_task_comm(tcomm, p);
113
114 if (escape)
115 seq_escape_str(m, tcomm, ESCAPE_SPACE | ESCAPE_SPECIAL, "\n\\");
116 else
117 seq_printf(m, "%.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 */
126 static 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
get_task_state(struct task_struct * tsk)142 static 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
task_state(struct seq_file * m,struct pid_namespace * ns,struct pid * pid,struct task_struct * p)148 static inline void task_state(struct seq_file *m, struct pid_namespace *ns,
149 struct pid *pid, struct task_struct *p)
150 {
151 struct user_namespace *user_ns = seq_user_ns(m);
152 struct group_info *group_info;
153 int g, umask = -1;
154 struct task_struct *tracer;
155 const struct cred *cred;
156 pid_t ppid, tpid = 0, tgid, ngid;
157 unsigned int max_fds = 0;
158
159 rcu_read_lock();
160 tracer = ptrace_parent(p);
161 if (tracer)
162 tpid = task_pid_nr_ns(tracer, ns);
163
164 ppid = task_ppid_nr_ns(p, ns);
165 tgid = task_tgid_nr_ns(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, "Umask:\t%#04o\n", umask);
179 seq_puts(m, "State:\t");
180 seq_puts(m, get_task_state(p));
181
182 seq_put_decimal_ull(m, "\nTgid:\t", tgid);
183 seq_put_decimal_ull(m, "\nNgid:\t", ngid);
184 seq_put_decimal_ull(m, "\nPid:\t", pid_nr_ns(pid, ns));
185 seq_put_decimal_ull(m, "\nPPid:\t", ppid);
186 seq_put_decimal_ull(m, "\nTracerPid:\t", tpid);
187 seq_put_decimal_ull(m, "\nUid:\t", from_kuid_munged(user_ns, cred->uid));
188 seq_put_decimal_ull(m, "\t", from_kuid_munged(user_ns, cred->euid));
189 seq_put_decimal_ull(m, "\t", from_kuid_munged(user_ns, cred->suid));
190 seq_put_decimal_ull(m, "\t", from_kuid_munged(user_ns, cred->fsuid));
191 seq_put_decimal_ull(m, "\nGid:\t", from_kgid_munged(user_ns, cred->gid));
192 seq_put_decimal_ull(m, "\t", from_kgid_munged(user_ns, cred->egid));
193 seq_put_decimal_ull(m, "\t", from_kgid_munged(user_ns, cred->sgid));
194 seq_put_decimal_ull(m, "\t", from_kgid_munged(user_ns, cred->fsgid));
195 seq_put_decimal_ull(m, "\nFDSize:\t", max_fds);
196
197 seq_puts(m, "\nGroups:\t");
198 group_info = cred->group_info;
199 for (g = 0; g < group_info->ngroups; g++)
200 seq_put_decimal_ull(m, g ? " " : "",
201 from_kgid_munged(user_ns, group_info->gid[g]));
202 put_cred(cred);
203 /* Trailing space shouldn't have been added in the first place. */
204 seq_putc(m, ' ');
205
206 #ifdef CONFIG_PID_NS
207 seq_puts(m, "\nNStgid:");
208 for (g = ns->level; g <= pid->level; g++)
209 seq_put_decimal_ull(m, "\t", task_tgid_nr_ns(p, pid->numbers[g].ns));
210 seq_puts(m, "\nNSpid:");
211 for (g = ns->level; g <= pid->level; g++)
212 seq_put_decimal_ull(m, "\t", task_pid_nr_ns(p, pid->numbers[g].ns));
213 seq_puts(m, "\nNSpgid:");
214 for (g = ns->level; g <= pid->level; g++)
215 seq_put_decimal_ull(m, "\t", task_pgrp_nr_ns(p, pid->numbers[g].ns));
216 seq_puts(m, "\nNSsid:");
217 for (g = ns->level; g <= pid->level; g++)
218 seq_put_decimal_ull(m, "\t", task_session_nr_ns(p, pid->numbers[g].ns));
219 #endif
220 seq_putc(m, '\n');
221
222 seq_printf(m, "Kthread:\t%c\n", p->flags & PF_KTHREAD ? '1' : '0');
223 }
224
render_sigset_t(struct seq_file * m,const char * header,sigset_t * set)225 void render_sigset_t(struct seq_file *m, const char *header,
226 sigset_t *set)
227 {
228 int i;
229
230 seq_puts(m, header);
231
232 i = _NSIG;
233 do {
234 int x = 0;
235
236 i -= 4;
237 if (sigismember(set, i+1)) x |= 1;
238 if (sigismember(set, i+2)) x |= 2;
239 if (sigismember(set, i+3)) x |= 4;
240 if (sigismember(set, i+4)) x |= 8;
241 seq_putc(m, hex_asc[x]);
242 } while (i >= 4);
243
244 seq_putc(m, '\n');
245 }
246
collect_sigign_sigcatch(struct task_struct * p,sigset_t * sigign,sigset_t * sigcatch)247 static 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(sigign, i);
257 else if (k->sa.sa_handler != SIG_DFL)
258 sigaddset(sigcatch, i);
259 }
260 }
261
task_sig(struct seq_file * m,struct task_struct * p)262 static 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(&pending);
271 sigemptyset(&shpending);
272 sigemptyset(&blocked);
273 sigemptyset(&ignored);
274 sigemptyset(&caught);
275
276 if (lock_task_sighand(p, &flags)) {
277 pending = p->pending.signal;
278 shpending = p->signal->shared_pending.signal;
279 blocked = p->blocked;
280 collect_sigign_sigcatch(p, &ignored, &caught);
281 num_threads = get_nr_threads(p);
282 rcu_read_lock(); /* FIXME: is this correct? */
283 qsize = get_rlimit_value(task_ucounts(p), UCOUNT_RLIMIT_SIGPENDING);
284 rcu_read_unlock();
285 qlim = task_rlimit(p, RLIMIT_SIGPENDING);
286 unlock_task_sighand(p, &flags);
287 }
288
289 seq_put_decimal_ull(m, "Threads:\t", num_threads);
290 seq_put_decimal_ull(m, "\nSigQ:\t", qsize);
291 seq_put_decimal_ull(m, "/", qlim);
292
293 /* render them all */
294 render_sigset_t(m, "\nSigPnd:\t", &pending);
295 render_sigset_t(m, "ShdPnd:\t", &shpending);
296 render_sigset_t(m, "SigBlk:\t", &blocked);
297 render_sigset_t(m, "SigIgn:\t", &ignored);
298 render_sigset_t(m, "SigCgt:\t", &caught);
299 }
300
render_cap_t(struct seq_file * m,const char * header,kernel_cap_t * a)301 static void render_cap_t(struct seq_file *m, const char *header,
302 kernel_cap_t *a)
303 {
304 seq_puts(m, header);
305 seq_put_hex_ll(m, NULL, a->val, 16);
306 seq_putc(m, '\n');
307 }
308
task_cap(struct seq_file * m,struct task_struct * p)309 static 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, "CapInh:\t", &cap_inheritable);
325 render_cap_t(m, "CapPrm:\t", &cap_permitted);
326 render_cap_t(m, "CapEff:\t", &cap_effective);
327 render_cap_t(m, "CapBnd:\t", &cap_bset);
328 render_cap_t(m, "CapAmb:\t", &cap_ambient);
329 }
330
task_seccomp(struct seq_file * m,struct task_struct * p)331 static inline void task_seccomp(struct seq_file *m, struct task_struct *p)
332 {
333 seq_put_decimal_ull(m, "NoNewPrivs:\t", task_no_new_privs(p));
334 #ifdef CONFIG_SECCOMP
335 seq_put_decimal_ull(m, "\nSeccomp:\t", p->seccomp.mode);
336 #ifdef CONFIG_SECCOMP_FILTER
337 seq_put_decimal_ull(m, "\nSeccomp_filters:\t",
338 atomic_read(&p->seccomp.filter_count));
339 #endif
340 #endif
341 seq_puts(m, "\nSpeculation_Store_Bypass:\t");
342 switch (arch_prctl_spec_ctrl_get(p, PR_SPEC_STORE_BYPASS)) {
343 case -EINVAL:
344 seq_puts(m, "unknown");
345 break;
346 case PR_SPEC_NOT_AFFECTED:
347 seq_puts(m, "not vulnerable");
348 break;
349 case PR_SPEC_PRCTL | PR_SPEC_FORCE_DISABLE:
350 seq_puts(m, "thread force mitigated");
351 break;
352 case PR_SPEC_PRCTL | PR_SPEC_DISABLE:
353 seq_puts(m, "thread mitigated");
354 break;
355 case PR_SPEC_PRCTL | PR_SPEC_ENABLE:
356 seq_puts(m, "thread vulnerable");
357 break;
358 case PR_SPEC_DISABLE:
359 seq_puts(m, "globally mitigated");
360 break;
361 default:
362 seq_puts(m, "vulnerable");
363 break;
364 }
365
366 seq_puts(m, "\nSpeculationIndirectBranch:\t");
367 switch (arch_prctl_spec_ctrl_get(p, PR_SPEC_INDIRECT_BRANCH)) {
368 case -EINVAL:
369 seq_puts(m, "unsupported");
370 break;
371 case PR_SPEC_NOT_AFFECTED:
372 seq_puts(m, "not affected");
373 break;
374 case PR_SPEC_PRCTL | PR_SPEC_FORCE_DISABLE:
375 seq_puts(m, "conditional force disabled");
376 break;
377 case PR_SPEC_PRCTL | PR_SPEC_DISABLE:
378 seq_puts(m, "conditional disabled");
379 break;
380 case PR_SPEC_PRCTL | PR_SPEC_ENABLE:
381 seq_puts(m, "conditional enabled");
382 break;
383 case PR_SPEC_ENABLE:
384 seq_puts(m, "always enabled");
385 break;
386 case PR_SPEC_DISABLE:
387 seq_puts(m, "always disabled");
388 break;
389 default:
390 seq_puts(m, "unknown");
391 break;
392 }
393 seq_putc(m, '\n');
394 }
395
task_context_switch_counts(struct seq_file * m,struct task_struct * p)396 static inline void task_context_switch_counts(struct seq_file *m,
397 struct task_struct *p)
398 {
399 seq_put_decimal_ull(m, "voluntary_ctxt_switches:\t", p->nvcsw);
400 seq_put_decimal_ull(m, "\nnonvoluntary_ctxt_switches:\t", p->nivcsw);
401 seq_putc(m, '\n');
402 }
403
task_cpus_allowed(struct seq_file * m,struct task_struct * task)404 static void task_cpus_allowed(struct seq_file *m, struct task_struct *task)
405 {
406 seq_printf(m, "Cpus_allowed:\t%*pb\n",
407 cpumask_pr_args(&task->cpus_mask));
408 seq_printf(m, "Cpus_allowed_list:\t%*pbl\n",
409 cpumask_pr_args(&task->cpus_mask));
410 }
411
task_core_dumping(struct seq_file * m,struct task_struct * task)412 static inline void task_core_dumping(struct seq_file *m, struct task_struct *task)
413 {
414 seq_put_decimal_ull(m, "CoreDumping:\t", !!task->signal->core_state);
415 seq_putc(m, '\n');
416 }
417
task_thp_status(struct seq_file * m,struct mm_struct * mm)418 static 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, "THP_enabled:\t%d\n", thp_enabled);
425 }
426
task_untag_mask(struct seq_file * m,struct mm_struct * mm)427 static inline void task_untag_mask(struct seq_file *m, struct mm_struct *mm)
428 {
429 seq_printf(m, "untag_mask:\t%#lx\n", mm_untag_mask(mm));
430 }
431
arch_proc_pid_thread_features(struct seq_file * m,struct task_struct * task)432 __weak void arch_proc_pid_thread_features(struct seq_file *m,
433 struct task_struct *task)
434 {
435 }
436
proc_pid_status(struct seq_file * m,struct pid_namespace * ns,struct pid * pid,struct task_struct * task)437 int 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, "Name:\t");
443 proc_task_name(m, task, true);
444 seq_putc(m, '\n');
445
446 task_state(m, ns, pid, 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, task);
456 task_cap(m, task);
457 task_seccomp(m, task);
458 task_cpus_allowed(m, task);
459 cpuset_task_status_allowed(m, task);
460 task_context_switch_counts(m, task);
461 arch_proc_pid_thread_features(m, task);
462 return 0;
463 }
464
do_task_stat(struct seq_file * m,struct pid_namespace * ns,struct pid * pid,struct task_struct * task,int whole)465 static 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 unsigned int seq = 1;
485
486 state = *get_task_state(task);
487 vsize = eip = esp = 0;
488 permitted = ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS | PTRACE_MODE_NOAUDIT);
489 mm = get_task_mm(task);
490 if (mm) {
491 vsize = task_vsize(mm);
492 /*
493 * esp and eip are intentionally zeroed out. There is no
494 * non-racy way to read them without freezing the task.
495 * Programs that need reliable values can use ptrace(2).
496 *
497 * The only exception is if the task is core dumping because
498 * a program is not able to use ptrace(2) in that case. It is
499 * safe because the task has stopped executing permanently.
500 */
501 if (permitted && (task->flags & (PF_EXITING|PF_DUMPCORE|PF_POSTCOREDUMP))) {
502 if (try_get_task_stack(task)) {
503 eip = KSTK_EIP(task);
504 esp = KSTK_ESP(task);
505 put_task_stack(task);
506 }
507 }
508 }
509
510 sigemptyset(&sigign);
511 sigemptyset(&sigcatch);
512
513 if (lock_task_sighand(task, &flags)) {
514 if (sig->tty) {
515 struct pid *pgrp = tty_get_pgrp(sig->tty);
516 tty_pgrp = pid_nr_ns(pgrp, ns);
517 put_pid(pgrp);
518 tty_nr = new_encode_dev(tty_devnum(sig->tty));
519 }
520
521 num_threads = get_nr_threads(task);
522 collect_sigign_sigcatch(task, &sigign, &sigcatch);
523
524 rsslim = READ_ONCE(sig->rlim[RLIMIT_RSS].rlim_cur);
525
526 if (whole) {
527 if (sig->flags & (SIGNAL_GROUP_EXIT | SIGNAL_STOP_STOPPED))
528 exit_code = sig->group_exit_code;
529 }
530
531 sid = task_session_nr_ns(task, ns);
532 ppid = task_tgid_nr_ns(task->real_parent, ns);
533 pgid = task_pgrp_nr_ns(task, ns);
534
535 unlock_task_sighand(task, &flags);
536 }
537
538 if (permitted && (!whole || num_threads < 2))
539 wchan = !task_is_running(task);
540
541 do {
542 seq++; /* 2 on the 1st/lockless path, otherwise odd */
543 flags = read_seqbegin_or_lock_irqsave(&sig->stats_lock, &seq);
544
545 cmin_flt = sig->cmin_flt;
546 cmaj_flt = sig->cmaj_flt;
547 cutime = sig->cutime;
548 cstime = sig->cstime;
549 cgtime = sig->cgtime;
550
551 if (whole) {
552 struct task_struct *t;
553
554 min_flt = sig->min_flt;
555 maj_flt = sig->maj_flt;
556 gtime = sig->gtime;
557
558 rcu_read_lock();
559 __for_each_thread(sig, t) {
560 min_flt += t->min_flt;
561 maj_flt += t->maj_flt;
562 gtime += task_gtime(t);
563 }
564 rcu_read_unlock();
565 }
566 } while (need_seqretry(&sig->stats_lock, seq));
567 done_seqretry_irqrestore(&sig->stats_lock, seq, flags);
568
569 if (whole) {
570 thread_group_cputime_adjusted(task, &utime, &stime);
571 } else {
572 task_cputime_adjusted(task, &utime, &stime);
573 min_flt = task->min_flt;
574 maj_flt = task->maj_flt;
575 gtime = task_gtime(task);
576 }
577
578 /* scale priority and nice values from timeslices to -20..20 */
579 /* to make it look like a "normal" Unix priority/nice value */
580 priority = task_prio(task);
581 nice = task_nice(task);
582
583 /* apply timens offset for boottime and convert nsec -> ticks */
584 start_time =
585 nsec_to_clock_t(timens_add_boottime_ns(task->start_boottime));
586
587 seq_put_decimal_ull(m, "", pid_nr_ns(pid, ns));
588 seq_puts(m, " (");
589 proc_task_name(m, task, false);
590 seq_puts(m, ") ");
591 seq_putc(m, state);
592 seq_put_decimal_ll(m, " ", ppid);
593 seq_put_decimal_ll(m, " ", pgid);
594 seq_put_decimal_ll(m, " ", sid);
595 seq_put_decimal_ll(m, " ", tty_nr);
596 seq_put_decimal_ll(m, " ", tty_pgrp);
597 seq_put_decimal_ull(m, " ", task->flags);
598 seq_put_decimal_ull(m, " ", min_flt);
599 seq_put_decimal_ull(m, " ", cmin_flt);
600 seq_put_decimal_ull(m, " ", maj_flt);
601 seq_put_decimal_ull(m, " ", cmaj_flt);
602 seq_put_decimal_ull(m, " ", nsec_to_clock_t(utime));
603 seq_put_decimal_ull(m, " ", nsec_to_clock_t(stime));
604 seq_put_decimal_ll(m, " ", nsec_to_clock_t(cutime));
605 seq_put_decimal_ll(m, " ", nsec_to_clock_t(cstime));
606 seq_put_decimal_ll(m, " ", priority);
607 seq_put_decimal_ll(m, " ", nice);
608 seq_put_decimal_ll(m, " ", num_threads);
609 seq_put_decimal_ull(m, " ", 0);
610 seq_put_decimal_ull(m, " ", start_time);
611 seq_put_decimal_ull(m, " ", vsize);
612 seq_put_decimal_ull(m, " ", mm ? get_mm_rss(mm) : 0);
613 seq_put_decimal_ull(m, " ", rsslim);
614 seq_put_decimal_ull(m, " ", mm ? (permitted ? mm->start_code : 1) : 0);
615 seq_put_decimal_ull(m, " ", mm ? (permitted ? mm->end_code : 1) : 0);
616 seq_put_decimal_ull(m, " ", (permitted && mm) ? mm->start_stack : 0);
617 seq_put_decimal_ull(m, " ", esp);
618 seq_put_decimal_ull(m, " ", eip);
619 /* The signal information here is obsolete.
620 * It must be decimal for Linux 2.0 compatibility.
621 * Use /proc/#/status for real-time signals.
622 */
623 seq_put_decimal_ull(m, " ", task->pending.signal.sig[0] & 0x7fffffffUL);
624 seq_put_decimal_ull(m, " ", task->blocked.sig[0] & 0x7fffffffUL);
625 seq_put_decimal_ull(m, " ", sigign.sig[0] & 0x7fffffffUL);
626 seq_put_decimal_ull(m, " ", sigcatch.sig[0] & 0x7fffffffUL);
627
628 /*
629 * We used to output the absolute kernel address, but that's an
630 * information leak - so instead we show a 0/1 flag here, to signal
631 * to user-space whether there's a wchan field in /proc/PID/wchan.
632 *
633 * This works with older implementations of procps as well.
634 */
635 seq_put_decimal_ull(m, " ", wchan);
636
637 seq_put_decimal_ull(m, " ", 0);
638 seq_put_decimal_ull(m, " ", 0);
639 seq_put_decimal_ll(m, " ", task->exit_signal);
640 seq_put_decimal_ll(m, " ", task_cpu(task));
641 seq_put_decimal_ull(m, " ", task->rt_priority);
642 seq_put_decimal_ull(m, " ", task->policy);
643 seq_put_decimal_ull(m, " ", delayacct_blkio_ticks(task));
644 seq_put_decimal_ull(m, " ", nsec_to_clock_t(gtime));
645 seq_put_decimal_ll(m, " ", nsec_to_clock_t(cgtime));
646
647 if (mm && permitted) {
648 seq_put_decimal_ull(m, " ", mm->start_data);
649 seq_put_decimal_ull(m, " ", mm->end_data);
650 seq_put_decimal_ull(m, " ", mm->start_brk);
651 seq_put_decimal_ull(m, " ", mm->arg_start);
652 seq_put_decimal_ull(m, " ", mm->arg_end);
653 seq_put_decimal_ull(m, " ", mm->env_start);
654 seq_put_decimal_ull(m, " ", mm->env_end);
655 } else
656 seq_puts(m, " 0 0 0 0 0 0 0");
657
658 if (permitted)
659 seq_put_decimal_ll(m, " ", exit_code);
660 else
661 seq_puts(m, " 0");
662
663 seq_putc(m, '\n');
664 if (mm)
665 mmput(mm);
666 return 0;
667 }
668
proc_tid_stat(struct seq_file * m,struct pid_namespace * ns,struct pid * pid,struct task_struct * task)669 int proc_tid_stat(struct seq_file *m, struct pid_namespace *ns,
670 struct pid *pid, struct task_struct *task)
671 {
672 return do_task_stat(m, ns, pid, task, 0);
673 }
674
proc_tgid_stat(struct seq_file * m,struct pid_namespace * ns,struct pid * pid,struct task_struct * task)675 int proc_tgid_stat(struct seq_file *m, struct pid_namespace *ns,
676 struct pid *pid, struct task_struct *task)
677 {
678 return do_task_stat(m, ns, pid, task, 1);
679 }
680
proc_pid_statm(struct seq_file * m,struct pid_namespace * ns,struct pid * pid,struct task_struct * task)681 int proc_pid_statm(struct seq_file *m, struct pid_namespace *ns,
682 struct pid *pid, struct task_struct *task)
683 {
684 struct mm_struct *mm = get_task_mm(task);
685
686 if (mm) {
687 unsigned long size;
688 unsigned long resident = 0;
689 unsigned long shared = 0;
690 unsigned long text = 0;
691 unsigned long data = 0;
692
693 size = task_statm(mm, &shared, &text, &data, &resident);
694 mmput(mm);
695
696 /*
697 * For quick read, open code by putting numbers directly
698 * expected format is
699 * seq_printf(m, "%lu %lu %lu %lu 0 %lu 0\n",
700 * size, resident, shared, text, data);
701 */
702 seq_put_decimal_ull(m, "", size);
703 seq_put_decimal_ull(m, " ", resident);
704 seq_put_decimal_ull(m, " ", shared);
705 seq_put_decimal_ull(m, " ", text);
706 seq_put_decimal_ull(m, " ", 0);
707 seq_put_decimal_ull(m, " ", data);
708 seq_put_decimal_ull(m, " ", 0);
709 seq_putc(m, '\n');
710 } else {
711 seq_write(m, "0 0 0 0 0 0 0\n", 14);
712 }
713 return 0;
714 }
715
716 #ifdef CONFIG_PROC_CHILDREN
717 static struct pid *
get_children_pid(struct inode * inode,struct pid * pid_prev,loff_t pos)718 get_children_pid(struct inode *inode, struct pid *pid_prev, loff_t pos)
719 {
720 struct task_struct *start, *task;
721 struct pid *pid = NULL;
722
723 read_lock(&tasklist_lock);
724
725 start = pid_task(proc_pid(inode), PIDTYPE_PID);
726 if (!start)
727 goto out;
728
729 /*
730 * Lets try to continue searching first, this gives
731 * us significant speedup on children-rich processes.
732 */
733 if (pid_prev) {
734 task = pid_task(pid_prev, PIDTYPE_PID);
735 if (task && task->real_parent == start &&
736 !(list_empty(&task->sibling))) {
737 if (list_is_last(&task->sibling, &start->children))
738 goto out;
739 task = list_first_entry(&task->sibling,
740 struct task_struct, sibling);
741 pid = get_pid(task_pid(task));
742 goto out;
743 }
744 }
745
746 /*
747 * Slow search case.
748 *
749 * We might miss some children here if children
750 * are exited while we were not holding the lock,
751 * but it was never promised to be accurate that
752 * much.
753 *
754 * "Just suppose that the parent sleeps, but N children
755 * exit after we printed their tids. Now the slow paths
756 * skips N extra children, we miss N tasks." (c)
757 *
758 * So one need to stop or freeze the leader and all
759 * its children to get a precise result.
760 */
761 list_for_each_entry(task, &start->children, sibling) {
762 if (pos-- == 0) {
763 pid = get_pid(task_pid(task));
764 break;
765 }
766 }
767
768 out:
769 read_unlock(&tasklist_lock);
770 return pid;
771 }
772
children_seq_show(struct seq_file * seq,void * v)773 static int children_seq_show(struct seq_file *seq, void *v)
774 {
775 struct inode *inode = file_inode(seq->file);
776
777 seq_printf(seq, "%d ", pid_nr_ns(v, proc_pid_ns(inode->i_sb)));
778 return 0;
779 }
780
children_seq_start(struct seq_file * seq,loff_t * pos)781 static void *children_seq_start(struct seq_file *seq, loff_t *pos)
782 {
783 return get_children_pid(file_inode(seq->file), NULL, *pos);
784 }
785
children_seq_next(struct seq_file * seq,void * v,loff_t * pos)786 static void *children_seq_next(struct seq_file *seq, void *v, loff_t *pos)
787 {
788 struct pid *pid;
789
790 pid = get_children_pid(file_inode(seq->file), v, *pos + 1);
791 put_pid(v);
792
793 ++*pos;
794 return pid;
795 }
796
children_seq_stop(struct seq_file * seq,void * v)797 static void children_seq_stop(struct seq_file *seq, void *v)
798 {
799 put_pid(v);
800 }
801
802 static const struct seq_operations children_seq_ops = {
803 .start = children_seq_start,
804 .next = children_seq_next,
805 .stop = children_seq_stop,
806 .show = children_seq_show,
807 };
808
children_seq_open(struct inode * inode,struct file * file)809 static int children_seq_open(struct inode *inode, struct file *file)
810 {
811 return seq_open(file, &children_seq_ops);
812 }
813
814 const struct file_operations proc_tid_children_operations = {
815 .open = children_seq_open,
816 .read = seq_read,
817 .llseek = seq_lseek,
818 .release = seq_release,
819 };
820 #endif /* CONFIG_PROC_CHILDREN */
821