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/uaccess.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/tracehook.h>
92 #include <linux/string_helpers.h>
93 #include <linux/user_namespace.h>
94 #include <linux/fs_struct.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 if (p->flags & PF_WQ_WORKER)
104 wq_worker_comm(tcomm, sizeof(tcomm), p);
105 else
106 __get_task_comm(tcomm, sizeof(tcomm), p);
107
108 if (escape)
109 seq_escape_str(m, tcomm, ESCAPE_SPACE | ESCAPE_SPECIAL, "\n\\");
110 else
111 seq_printf(m, "%.64s", tcomm);
112 }
113
114 /*
115 * The task state array is a strange "bitmap" of
116 * reasons to sleep. Thus "running" is zero, and
117 * you can test for combinations of others with
118 * simple bit tests.
119 */
120 static const char * const task_state_array[] = {
121
122 /* states in TASK_REPORT: */
123 "R (running)", /* 0x00 */
124 "S (sleeping)", /* 0x01 */
125 "D (disk sleep)", /* 0x02 */
126 "T (stopped)", /* 0x04 */
127 "t (tracing stop)", /* 0x08 */
128 "X (dead)", /* 0x10 */
129 "Z (zombie)", /* 0x20 */
130 "P (parked)", /* 0x40 */
131
132 /* states beyond TASK_REPORT: */
133 "I (idle)", /* 0x80 */
134 };
135
get_task_state(struct task_struct * tsk)136 static inline const char *get_task_state(struct task_struct *tsk)
137 {
138 BUILD_BUG_ON(1 + ilog2(TASK_REPORT_MAX) != ARRAY_SIZE(task_state_array));
139 return task_state_array[task_state_index(tsk)];
140 }
141
task_state(struct seq_file * m,struct pid_namespace * ns,struct pid * pid,struct task_struct * p)142 static inline void task_state(struct seq_file *m, struct pid_namespace *ns,
143 struct pid *pid, struct task_struct *p)
144 {
145 struct user_namespace *user_ns = seq_user_ns(m);
146 struct group_info *group_info;
147 int g, umask = -1;
148 struct task_struct *tracer;
149 const struct cred *cred;
150 pid_t ppid, tpid = 0, tgid, ngid;
151 unsigned int max_fds = 0;
152
153 rcu_read_lock();
154 ppid = pid_alive(p) ?
155 task_tgid_nr_ns(rcu_dereference(p->real_parent), ns) : 0;
156
157 tracer = ptrace_parent(p);
158 if (tracer)
159 tpid = task_pid_nr_ns(tracer, ns);
160
161 tgid = task_tgid_nr_ns(p, ns);
162 ngid = task_numa_group_id(p);
163 cred = get_task_cred(p);
164
165 task_lock(p);
166 if (p->fs)
167 umask = p->fs->umask;
168 if (p->files)
169 max_fds = files_fdtable(p->files)->max_fds;
170 task_unlock(p);
171 rcu_read_unlock();
172
173 if (umask >= 0)
174 seq_printf(m, "Umask:\t%#04o\n", umask);
175 seq_puts(m, "State:\t");
176 seq_puts(m, get_task_state(p));
177
178 seq_put_decimal_ull(m, "\nTgid:\t", tgid);
179 seq_put_decimal_ull(m, "\nNgid:\t", ngid);
180 seq_put_decimal_ull(m, "\nPid:\t", pid_nr_ns(pid, ns));
181 seq_put_decimal_ull(m, "\nPPid:\t", ppid);
182 seq_put_decimal_ull(m, "\nTracerPid:\t", tpid);
183 seq_put_decimal_ull(m, "\nUid:\t", from_kuid_munged(user_ns, cred->uid));
184 seq_put_decimal_ull(m, "\t", from_kuid_munged(user_ns, cred->euid));
185 seq_put_decimal_ull(m, "\t", from_kuid_munged(user_ns, cred->suid));
186 seq_put_decimal_ull(m, "\t", from_kuid_munged(user_ns, cred->fsuid));
187 seq_put_decimal_ull(m, "\nGid:\t", from_kgid_munged(user_ns, cred->gid));
188 seq_put_decimal_ull(m, "\t", from_kgid_munged(user_ns, cred->egid));
189 seq_put_decimal_ull(m, "\t", from_kgid_munged(user_ns, cred->sgid));
190 seq_put_decimal_ull(m, "\t", from_kgid_munged(user_ns, cred->fsgid));
191 seq_put_decimal_ull(m, "\nFDSize:\t", max_fds);
192
193 seq_puts(m, "\nGroups:\t");
194 group_info = cred->group_info;
195 for (g = 0; g < group_info->ngroups; g++)
196 seq_put_decimal_ull(m, g ? " " : "",
197 from_kgid_munged(user_ns, group_info->gid[g]));
198 put_cred(cred);
199 /* Trailing space shouldn't have been added in the first place. */
200 seq_putc(m, ' ');
201
202 #ifdef CONFIG_PID_NS
203 seq_puts(m, "\nNStgid:");
204 for (g = ns->level; g <= pid->level; g++)
205 seq_put_decimal_ull(m, "\t", task_tgid_nr_ns(p, pid->numbers[g].ns));
206 seq_puts(m, "\nNSpid:");
207 for (g = ns->level; g <= pid->level; g++)
208 seq_put_decimal_ull(m, "\t", task_pid_nr_ns(p, pid->numbers[g].ns));
209 seq_puts(m, "\nNSpgid:");
210 for (g = ns->level; g <= pid->level; g++)
211 seq_put_decimal_ull(m, "\t", task_pgrp_nr_ns(p, pid->numbers[g].ns));
212 seq_puts(m, "\nNSsid:");
213 for (g = ns->level; g <= pid->level; g++)
214 seq_put_decimal_ull(m, "\t", task_session_nr_ns(p, pid->numbers[g].ns));
215 #endif
216 seq_putc(m, '\n');
217 }
218
render_sigset_t(struct seq_file * m,const char * header,sigset_t * set)219 void render_sigset_t(struct seq_file *m, const char *header,
220 sigset_t *set)
221 {
222 int i;
223
224 seq_puts(m, header);
225
226 i = _NSIG;
227 do {
228 int x = 0;
229
230 i -= 4;
231 if (sigismember(set, i+1)) x |= 1;
232 if (sigismember(set, i+2)) x |= 2;
233 if (sigismember(set, i+3)) x |= 4;
234 if (sigismember(set, i+4)) x |= 8;
235 seq_putc(m, hex_asc[x]);
236 } while (i >= 4);
237
238 seq_putc(m, '\n');
239 }
240
collect_sigign_sigcatch(struct task_struct * p,sigset_t * sigign,sigset_t * sigcatch)241 static void collect_sigign_sigcatch(struct task_struct *p, sigset_t *sigign,
242 sigset_t *sigcatch)
243 {
244 struct k_sigaction *k;
245 int i;
246
247 k = p->sighand->action;
248 for (i = 1; i <= _NSIG; ++i, ++k) {
249 if (k->sa.sa_handler == SIG_IGN)
250 sigaddset(sigign, i);
251 else if (k->sa.sa_handler != SIG_DFL)
252 sigaddset(sigcatch, i);
253 }
254 }
255
task_sig(struct seq_file * m,struct task_struct * p)256 static inline void task_sig(struct seq_file *m, struct task_struct *p)
257 {
258 unsigned long flags;
259 sigset_t pending, shpending, blocked, ignored, caught;
260 int num_threads = 0;
261 unsigned int qsize = 0;
262 unsigned long qlim = 0;
263
264 sigemptyset(&pending);
265 sigemptyset(&shpending);
266 sigemptyset(&blocked);
267 sigemptyset(&ignored);
268 sigemptyset(&caught);
269
270 if (lock_task_sighand(p, &flags)) {
271 pending = p->pending.signal;
272 shpending = p->signal->shared_pending.signal;
273 blocked = p->blocked;
274 collect_sigign_sigcatch(p, &ignored, &caught);
275 num_threads = get_nr_threads(p);
276 rcu_read_lock(); /* FIXME: is this correct? */
277 qsize = get_ucounts_value(task_ucounts(p), UCOUNT_RLIMIT_SIGPENDING);
278 rcu_read_unlock();
279 qlim = task_rlimit(p, RLIMIT_SIGPENDING);
280 unlock_task_sighand(p, &flags);
281 }
282
283 seq_put_decimal_ull(m, "Threads:\t", num_threads);
284 seq_put_decimal_ull(m, "\nSigQ:\t", qsize);
285 seq_put_decimal_ull(m, "/", qlim);
286
287 /* render them all */
288 render_sigset_t(m, "\nSigPnd:\t", &pending);
289 render_sigset_t(m, "ShdPnd:\t", &shpending);
290 render_sigset_t(m, "SigBlk:\t", &blocked);
291 render_sigset_t(m, "SigIgn:\t", &ignored);
292 render_sigset_t(m, "SigCgt:\t", &caught);
293 }
294
render_cap_t(struct seq_file * m,const char * header,kernel_cap_t * a)295 static void render_cap_t(struct seq_file *m, const char *header,
296 kernel_cap_t *a)
297 {
298 unsigned __capi;
299
300 seq_puts(m, header);
301 CAP_FOR_EACH_U32(__capi) {
302 seq_put_hex_ll(m, NULL,
303 a->cap[CAP_LAST_U32 - __capi], 8);
304 }
305 seq_putc(m, '\n');
306 }
307
task_cap(struct seq_file * m,struct task_struct * p)308 static inline void task_cap(struct seq_file *m, struct task_struct *p)
309 {
310 const struct cred *cred;
311 kernel_cap_t cap_inheritable, cap_permitted, cap_effective,
312 cap_bset, cap_ambient;
313
314 rcu_read_lock();
315 cred = __task_cred(p);
316 cap_inheritable = cred->cap_inheritable;
317 cap_permitted = cred->cap_permitted;
318 cap_effective = cred->cap_effective;
319 cap_bset = cred->cap_bset;
320 cap_ambient = cred->cap_ambient;
321 rcu_read_unlock();
322
323 render_cap_t(m, "CapInh:\t", &cap_inheritable);
324 render_cap_t(m, "CapPrm:\t", &cap_permitted);
325 render_cap_t(m, "CapEff:\t", &cap_effective);
326 render_cap_t(m, "CapBnd:\t", &cap_bset);
327 render_cap_t(m, "CapAmb:\t", &cap_ambient);
328 }
329
task_seccomp(struct seq_file * m,struct task_struct * p)330 static inline void task_seccomp(struct seq_file *m, struct task_struct *p)
331 {
332 seq_put_decimal_ull(m, "NoNewPrivs:\t", task_no_new_privs(p));
333 #ifdef CONFIG_SECCOMP
334 seq_put_decimal_ull(m, "\nSeccomp:\t", p->seccomp.mode);
335 #ifdef CONFIG_SECCOMP_FILTER
336 seq_put_decimal_ull(m, "\nSeccomp_filters:\t",
337 atomic_read(&p->seccomp.filter_count));
338 #endif
339 #endif
340 seq_puts(m, "\nSpeculation_Store_Bypass:\t");
341 switch (arch_prctl_spec_ctrl_get(p, PR_SPEC_STORE_BYPASS)) {
342 case -EINVAL:
343 seq_puts(m, "unknown");
344 break;
345 case PR_SPEC_NOT_AFFECTED:
346 seq_puts(m, "not vulnerable");
347 break;
348 case PR_SPEC_PRCTL | PR_SPEC_FORCE_DISABLE:
349 seq_puts(m, "thread force mitigated");
350 break;
351 case PR_SPEC_PRCTL | PR_SPEC_DISABLE:
352 seq_puts(m, "thread mitigated");
353 break;
354 case PR_SPEC_PRCTL | PR_SPEC_ENABLE:
355 seq_puts(m, "thread vulnerable");
356 break;
357 case PR_SPEC_DISABLE:
358 seq_puts(m, "globally mitigated");
359 break;
360 default:
361 seq_puts(m, "vulnerable");
362 break;
363 }
364
365 seq_puts(m, "\nSpeculationIndirectBranch:\t");
366 switch (arch_prctl_spec_ctrl_get(p, PR_SPEC_INDIRECT_BRANCH)) {
367 case -EINVAL:
368 seq_puts(m, "unsupported");
369 break;
370 case PR_SPEC_NOT_AFFECTED:
371 seq_puts(m, "not affected");
372 break;
373 case PR_SPEC_PRCTL | PR_SPEC_FORCE_DISABLE:
374 seq_puts(m, "conditional force disabled");
375 break;
376 case PR_SPEC_PRCTL | PR_SPEC_DISABLE:
377 seq_puts(m, "conditional disabled");
378 break;
379 case PR_SPEC_PRCTL | PR_SPEC_ENABLE:
380 seq_puts(m, "conditional enabled");
381 break;
382 case PR_SPEC_ENABLE:
383 seq_puts(m, "always enabled");
384 break;
385 case PR_SPEC_DISABLE:
386 seq_puts(m, "always disabled");
387 break;
388 default:
389 seq_puts(m, "unknown");
390 break;
391 }
392 seq_putc(m, '\n');
393 }
394
task_context_switch_counts(struct seq_file * m,struct task_struct * p)395 static inline void task_context_switch_counts(struct seq_file *m,
396 struct task_struct *p)
397 {
398 seq_put_decimal_ull(m, "voluntary_ctxt_switches:\t", p->nvcsw);
399 seq_put_decimal_ull(m, "\nnonvoluntary_ctxt_switches:\t", p->nivcsw);
400 seq_putc(m, '\n');
401 }
402
task_cpus_allowed(struct seq_file * m,struct task_struct * task)403 static void task_cpus_allowed(struct seq_file *m, struct task_struct *task)
404 {
405 seq_printf(m, "Cpus_allowed:\t%*pb\n",
406 cpumask_pr_args(&task->cpus_mask));
407 seq_printf(m, "Cpus_allowed_list:\t%*pbl\n",
408 cpumask_pr_args(&task->cpus_mask));
409 }
410
task_core_dumping(struct seq_file * m,struct mm_struct * mm)411 static inline void task_core_dumping(struct seq_file *m, struct mm_struct *mm)
412 {
413 seq_put_decimal_ull(m, "CoreDumping:\t", !!mm->core_state);
414 seq_putc(m, '\n');
415 }
416
task_thp_status(struct seq_file * m,struct mm_struct * mm)417 static inline void task_thp_status(struct seq_file *m, struct mm_struct *mm)
418 {
419 bool thp_enabled = IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE);
420
421 if (thp_enabled)
422 thp_enabled = !test_bit(MMF_DISABLE_THP, &mm->flags);
423 seq_printf(m, "THP_enabled:\t%d\n", thp_enabled);
424 }
425
proc_pid_status(struct seq_file * m,struct pid_namespace * ns,struct pid * pid,struct task_struct * task)426 int proc_pid_status(struct seq_file *m, struct pid_namespace *ns,
427 struct pid *pid, struct task_struct *task)
428 {
429 struct mm_struct *mm = get_task_mm(task);
430
431 seq_puts(m, "Name:\t");
432 proc_task_name(m, task, true);
433 seq_putc(m, '\n');
434
435 task_state(m, ns, pid, task);
436
437 if (mm) {
438 task_mem(m, mm);
439 task_core_dumping(m, mm);
440 task_thp_status(m, mm);
441 mmput(mm);
442 }
443 task_sig(m, task);
444 task_cap(m, task);
445 task_seccomp(m, task);
446 task_cpus_allowed(m, task);
447 cpuset_task_status_allowed(m, task);
448 task_context_switch_counts(m, task);
449 return 0;
450 }
451
do_task_stat(struct seq_file * m,struct pid_namespace * ns,struct pid * pid,struct task_struct * task,int whole)452 static int do_task_stat(struct seq_file *m, struct pid_namespace *ns,
453 struct pid *pid, struct task_struct *task, int whole)
454 {
455 unsigned long vsize, eip, esp, wchan = 0;
456 int priority, nice;
457 int tty_pgrp = -1, tty_nr = 0;
458 sigset_t sigign, sigcatch;
459 char state;
460 pid_t ppid = 0, pgid = -1, sid = -1;
461 int num_threads = 0;
462 int permitted;
463 struct mm_struct *mm;
464 unsigned long long start_time;
465 unsigned long cmin_flt = 0, cmaj_flt = 0;
466 unsigned long min_flt = 0, maj_flt = 0;
467 u64 cutime, cstime, utime, stime;
468 u64 cgtime, gtime;
469 unsigned long rsslim = 0;
470 unsigned long flags;
471
472 state = *get_task_state(task);
473 vsize = eip = esp = 0;
474 permitted = ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS | PTRACE_MODE_NOAUDIT);
475 mm = get_task_mm(task);
476 if (mm) {
477 vsize = task_vsize(mm);
478 /*
479 * esp and eip are intentionally zeroed out. There is no
480 * non-racy way to read them without freezing the task.
481 * Programs that need reliable values can use ptrace(2).
482 *
483 * The only exception is if the task is core dumping because
484 * a program is not able to use ptrace(2) in that case. It is
485 * safe because the task has stopped executing permanently.
486 */
487 if (permitted && (task->flags & (PF_EXITING|PF_DUMPCORE))) {
488 if (try_get_task_stack(task)) {
489 eip = KSTK_EIP(task);
490 esp = KSTK_ESP(task);
491 put_task_stack(task);
492 }
493 }
494 }
495
496 sigemptyset(&sigign);
497 sigemptyset(&sigcatch);
498 cutime = cstime = utime = stime = 0;
499 cgtime = gtime = 0;
500
501 if (lock_task_sighand(task, &flags)) {
502 struct signal_struct *sig = task->signal;
503
504 if (sig->tty) {
505 struct pid *pgrp = tty_get_pgrp(sig->tty);
506 tty_pgrp = pid_nr_ns(pgrp, ns);
507 put_pid(pgrp);
508 tty_nr = new_encode_dev(tty_devnum(sig->tty));
509 }
510
511 num_threads = get_nr_threads(task);
512 collect_sigign_sigcatch(task, &sigign, &sigcatch);
513
514 cmin_flt = sig->cmin_flt;
515 cmaj_flt = sig->cmaj_flt;
516 cutime = sig->cutime;
517 cstime = sig->cstime;
518 cgtime = sig->cgtime;
519 rsslim = READ_ONCE(sig->rlim[RLIMIT_RSS].rlim_cur);
520
521 /* add up live thread stats at the group level */
522 if (whole) {
523 struct task_struct *t = task;
524 do {
525 min_flt += t->min_flt;
526 maj_flt += t->maj_flt;
527 gtime += task_gtime(t);
528 } while_each_thread(task, t);
529
530 min_flt += sig->min_flt;
531 maj_flt += sig->maj_flt;
532 thread_group_cputime_adjusted(task, &utime, &stime);
533 gtime += sig->gtime;
534 }
535
536 sid = task_session_nr_ns(task, ns);
537 ppid = task_tgid_nr_ns(task->real_parent, 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 = get_wchan(task);
545 if (!whole) {
546 min_flt = task->min_flt;
547 maj_flt = task->maj_flt;
548 task_cputime_adjusted(task, &utime, &stime);
549 gtime = task_gtime(task);
550 }
551
552 /* scale priority and nice values from timeslices to -20..20 */
553 /* to make it look like a "normal" Unix priority/nice value */
554 priority = task_prio(task);
555 nice = task_nice(task);
556
557 /* apply timens offset for boottime and convert nsec -> ticks */
558 start_time =
559 nsec_to_clock_t(timens_add_boottime_ns(task->start_boottime));
560
561 seq_put_decimal_ull(m, "", pid_nr_ns(pid, ns));
562 seq_puts(m, " (");
563 proc_task_name(m, task, false);
564 seq_puts(m, ") ");
565 seq_putc(m, state);
566 seq_put_decimal_ll(m, " ", ppid);
567 seq_put_decimal_ll(m, " ", pgid);
568 seq_put_decimal_ll(m, " ", sid);
569 seq_put_decimal_ll(m, " ", tty_nr);
570 seq_put_decimal_ll(m, " ", tty_pgrp);
571 seq_put_decimal_ull(m, " ", task->flags);
572 seq_put_decimal_ull(m, " ", min_flt);
573 seq_put_decimal_ull(m, " ", cmin_flt);
574 seq_put_decimal_ull(m, " ", maj_flt);
575 seq_put_decimal_ull(m, " ", cmaj_flt);
576 seq_put_decimal_ull(m, " ", nsec_to_clock_t(utime));
577 seq_put_decimal_ull(m, " ", nsec_to_clock_t(stime));
578 seq_put_decimal_ll(m, " ", nsec_to_clock_t(cutime));
579 seq_put_decimal_ll(m, " ", nsec_to_clock_t(cstime));
580 seq_put_decimal_ll(m, " ", priority);
581 seq_put_decimal_ll(m, " ", nice);
582 seq_put_decimal_ll(m, " ", num_threads);
583 seq_put_decimal_ull(m, " ", 0);
584 seq_put_decimal_ull(m, " ", start_time);
585 seq_put_decimal_ull(m, " ", vsize);
586 seq_put_decimal_ull(m, " ", mm ? get_mm_rss(mm) : 0);
587 seq_put_decimal_ull(m, " ", rsslim);
588 seq_put_decimal_ull(m, " ", mm ? (permitted ? mm->start_code : 1) : 0);
589 seq_put_decimal_ull(m, " ", mm ? (permitted ? mm->end_code : 1) : 0);
590 seq_put_decimal_ull(m, " ", (permitted && mm) ? mm->start_stack : 0);
591 seq_put_decimal_ull(m, " ", esp);
592 seq_put_decimal_ull(m, " ", eip);
593 /* The signal information here is obsolete.
594 * It must be decimal for Linux 2.0 compatibility.
595 * Use /proc/#/status for real-time signals.
596 */
597 seq_put_decimal_ull(m, " ", task->pending.signal.sig[0] & 0x7fffffffUL);
598 seq_put_decimal_ull(m, " ", task->blocked.sig[0] & 0x7fffffffUL);
599 seq_put_decimal_ull(m, " ", sigign.sig[0] & 0x7fffffffUL);
600 seq_put_decimal_ull(m, " ", sigcatch.sig[0] & 0x7fffffffUL);
601
602 /*
603 * We used to output the absolute kernel address, but that's an
604 * information leak - so instead we show a 0/1 flag here, to signal
605 * to user-space whether there's a wchan field in /proc/PID/wchan.
606 *
607 * This works with older implementations of procps as well.
608 */
609 if (wchan)
610 seq_puts(m, " 1");
611 else
612 seq_puts(m, " 0");
613
614 seq_put_decimal_ull(m, " ", 0);
615 seq_put_decimal_ull(m, " ", 0);
616 seq_put_decimal_ll(m, " ", task->exit_signal);
617 seq_put_decimal_ll(m, " ", task_cpu(task));
618 seq_put_decimal_ull(m, " ", task->rt_priority);
619 seq_put_decimal_ull(m, " ", task->policy);
620 seq_put_decimal_ull(m, " ", delayacct_blkio_ticks(task));
621 seq_put_decimal_ull(m, " ", nsec_to_clock_t(gtime));
622 seq_put_decimal_ll(m, " ", nsec_to_clock_t(cgtime));
623
624 if (mm && permitted) {
625 seq_put_decimal_ull(m, " ", mm->start_data);
626 seq_put_decimal_ull(m, " ", mm->end_data);
627 seq_put_decimal_ull(m, " ", mm->start_brk);
628 seq_put_decimal_ull(m, " ", mm->arg_start);
629 seq_put_decimal_ull(m, " ", mm->arg_end);
630 seq_put_decimal_ull(m, " ", mm->env_start);
631 seq_put_decimal_ull(m, " ", mm->env_end);
632 } else
633 seq_puts(m, " 0 0 0 0 0 0 0");
634
635 if (permitted)
636 seq_put_decimal_ll(m, " ", task->exit_code);
637 else
638 seq_puts(m, " 0");
639
640 seq_putc(m, '\n');
641 if (mm)
642 mmput(mm);
643 return 0;
644 }
645
proc_tid_stat(struct seq_file * m,struct pid_namespace * ns,struct pid * pid,struct task_struct * task)646 int proc_tid_stat(struct seq_file *m, struct pid_namespace *ns,
647 struct pid *pid, struct task_struct *task)
648 {
649 return do_task_stat(m, ns, pid, task, 0);
650 }
651
proc_tgid_stat(struct seq_file * m,struct pid_namespace * ns,struct pid * pid,struct task_struct * task)652 int proc_tgid_stat(struct seq_file *m, struct pid_namespace *ns,
653 struct pid *pid, struct task_struct *task)
654 {
655 return do_task_stat(m, ns, pid, task, 1);
656 }
657
proc_pid_statm(struct seq_file * m,struct pid_namespace * ns,struct pid * pid,struct task_struct * task)658 int proc_pid_statm(struct seq_file *m, struct pid_namespace *ns,
659 struct pid *pid, struct task_struct *task)
660 {
661 struct mm_struct *mm = get_task_mm(task);
662
663 if (mm) {
664 unsigned long size;
665 unsigned long resident = 0;
666 unsigned long shared = 0;
667 unsigned long text = 0;
668 unsigned long data = 0;
669
670 size = task_statm(mm, &shared, &text, &data, &resident);
671 mmput(mm);
672
673 /*
674 * For quick read, open code by putting numbers directly
675 * expected format is
676 * seq_printf(m, "%lu %lu %lu %lu 0 %lu 0\n",
677 * size, resident, shared, text, data);
678 */
679 seq_put_decimal_ull(m, "", size);
680 seq_put_decimal_ull(m, " ", resident);
681 seq_put_decimal_ull(m, " ", shared);
682 seq_put_decimal_ull(m, " ", text);
683 seq_put_decimal_ull(m, " ", 0);
684 seq_put_decimal_ull(m, " ", data);
685 seq_put_decimal_ull(m, " ", 0);
686 seq_putc(m, '\n');
687 } else {
688 seq_write(m, "0 0 0 0 0 0 0\n", 14);
689 }
690 return 0;
691 }
692
693 #ifdef CONFIG_PROC_CHILDREN
694 static struct pid *
get_children_pid(struct inode * inode,struct pid * pid_prev,loff_t pos)695 get_children_pid(struct inode *inode, struct pid *pid_prev, loff_t pos)
696 {
697 struct task_struct *start, *task;
698 struct pid *pid = NULL;
699
700 read_lock(&tasklist_lock);
701
702 start = pid_task(proc_pid(inode), PIDTYPE_PID);
703 if (!start)
704 goto out;
705
706 /*
707 * Lets try to continue searching first, this gives
708 * us significant speedup on children-rich processes.
709 */
710 if (pid_prev) {
711 task = pid_task(pid_prev, PIDTYPE_PID);
712 if (task && task->real_parent == start &&
713 !(list_empty(&task->sibling))) {
714 if (list_is_last(&task->sibling, &start->children))
715 goto out;
716 task = list_first_entry(&task->sibling,
717 struct task_struct, sibling);
718 pid = get_pid(task_pid(task));
719 goto out;
720 }
721 }
722
723 /*
724 * Slow search case.
725 *
726 * We might miss some children here if children
727 * are exited while we were not holding the lock,
728 * but it was never promised to be accurate that
729 * much.
730 *
731 * "Just suppose that the parent sleeps, but N children
732 * exit after we printed their tids. Now the slow paths
733 * skips N extra children, we miss N tasks." (c)
734 *
735 * So one need to stop or freeze the leader and all
736 * its children to get a precise result.
737 */
738 list_for_each_entry(task, &start->children, sibling) {
739 if (pos-- == 0) {
740 pid = get_pid(task_pid(task));
741 break;
742 }
743 }
744
745 out:
746 read_unlock(&tasklist_lock);
747 return pid;
748 }
749
children_seq_show(struct seq_file * seq,void * v)750 static int children_seq_show(struct seq_file *seq, void *v)
751 {
752 struct inode *inode = file_inode(seq->file);
753
754 seq_printf(seq, "%d ", pid_nr_ns(v, proc_pid_ns(inode->i_sb)));
755 return 0;
756 }
757
children_seq_start(struct seq_file * seq,loff_t * pos)758 static void *children_seq_start(struct seq_file *seq, loff_t *pos)
759 {
760 return get_children_pid(file_inode(seq->file), NULL, *pos);
761 }
762
children_seq_next(struct seq_file * seq,void * v,loff_t * pos)763 static void *children_seq_next(struct seq_file *seq, void *v, loff_t *pos)
764 {
765 struct pid *pid;
766
767 pid = get_children_pid(file_inode(seq->file), v, *pos + 1);
768 put_pid(v);
769
770 ++*pos;
771 return pid;
772 }
773
children_seq_stop(struct seq_file * seq,void * v)774 static void children_seq_stop(struct seq_file *seq, void *v)
775 {
776 put_pid(v);
777 }
778
779 static const struct seq_operations children_seq_ops = {
780 .start = children_seq_start,
781 .next = children_seq_next,
782 .stop = children_seq_stop,
783 .show = children_seq_show,
784 };
785
children_seq_open(struct inode * inode,struct file * file)786 static int children_seq_open(struct inode *inode, struct file *file)
787 {
788 return seq_open(file, &children_seq_ops);
789 }
790
791 const struct file_operations proc_tid_children_operations = {
792 .open = children_seq_open,
793 .read = seq_read,
794 .llseek = seq_lseek,
795 .release = seq_release,
796 };
797 #endif /* CONFIG_PROC_CHILDREN */
798