1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55#include <linux/types.h>
56#include <linux/errno.h>
57#include <linux/time.h>
58#include <linux/kernel.h>
59#include <linux/kernel_stat.h>
60#include <linux/tty.h>
61#include <linux/string.h>
62#include <linux/mman.h>
63#include <linux/proc_fs.h>
64#include <linux/ioport.h>
65#include <linux/uaccess.h>
66#include <linux/io.h>
67#include <linux/mm.h>
68#include <linux/hugetlb.h>
69#include <linux/pagemap.h>
70#include <linux/swap.h>
71#include <linux/smp.h>
72#include <linux/signal.h>
73#include <linux/highmem.h>
74#include <linux/file.h>
75#include <linux/fdtable.h>
76#include <linux/times.h>
77#include <linux/cpuset.h>
78#include <linux/rcupdate.h>
79#include <linux/delayacct.h>
80#include <linux/seq_file.h>
81#include <linux/pid_namespace.h>
82#include <linux/ptrace.h>
83#include <linux/tracehook.h>
84#include <linux/user_namespace.h>
85
86#include <asm/pgtable.h>
87#include <asm/processor.h>
88#include "internal.h"
89
90static inline void task_name(struct seq_file *m, struct task_struct *p)
91{
92 int i;
93 char *buf, *end;
94 char *name;
95 char tcomm[sizeof(p->comm)];
96
97 get_task_comm(tcomm, p);
98
99 seq_puts(m, "Name:\t");
100 end = m->buf + m->size;
101 buf = m->buf + m->count;
102 name = tcomm;
103 i = sizeof(tcomm);
104 while (i && (buf < end)) {
105 unsigned char c = *name;
106 name++;
107 i--;
108 *buf = c;
109 if (!c)
110 break;
111 if (c == '\\') {
112 buf++;
113 if (buf < end)
114 *buf++ = c;
115 continue;
116 }
117 if (c == '\n') {
118 *buf++ = '\\';
119 if (buf < end)
120 *buf++ = 'n';
121 continue;
122 }
123 buf++;
124 }
125 m->count = buf - m->buf;
126 seq_putc(m, '\n');
127}
128
129
130
131
132
133
134
135static const char * const task_state_array[] = {
136 "R (running)",
137 "S (sleeping)",
138 "D (disk sleep)",
139 "T (stopped)",
140 "t (tracing stop)",
141 "X (dead)",
142 "Z (zombie)",
143};
144
145static inline const char *get_task_state(struct task_struct *tsk)
146{
147 unsigned int state = (tsk->state | tsk->exit_state) & TASK_REPORT;
148
149 BUILD_BUG_ON(1 + ilog2(TASK_REPORT) != ARRAY_SIZE(task_state_array)-1);
150
151 return task_state_array[fls(state)];
152}
153
154static inline void task_state(struct seq_file *m, struct pid_namespace *ns,
155 struct pid *pid, struct task_struct *p)
156{
157 struct user_namespace *user_ns = seq_user_ns(m);
158 struct group_info *group_info;
159 int g;
160 struct fdtable *fdt = NULL;
161 const struct cred *cred;
162 pid_t ppid, tpid;
163
164 rcu_read_lock();
165 ppid = pid_alive(p) ?
166 task_tgid_nr_ns(rcu_dereference(p->real_parent), ns) : 0;
167 tpid = 0;
168 if (pid_alive(p)) {
169 struct task_struct *tracer = ptrace_parent(p);
170 if (tracer)
171 tpid = task_pid_nr_ns(tracer, ns);
172 }
173 cred = get_task_cred(p);
174 seq_printf(m,
175 "State:\t%s\n"
176 "Tgid:\t%d\n"
177 "Ngid:\t%d\n"
178 "Pid:\t%d\n"
179 "PPid:\t%d\n"
180 "TracerPid:\t%d\n"
181 "Uid:\t%d\t%d\t%d\t%d\n"
182 "Gid:\t%d\t%d\t%d\t%d\n",
183 get_task_state(p),
184 task_tgid_nr_ns(p, ns),
185 task_numa_group_id(p),
186 pid_nr_ns(pid, ns),
187 ppid, tpid,
188 from_kuid_munged(user_ns, cred->uid),
189 from_kuid_munged(user_ns, cred->euid),
190 from_kuid_munged(user_ns, cred->suid),
191 from_kuid_munged(user_ns, cred->fsuid),
192 from_kgid_munged(user_ns, cred->gid),
193 from_kgid_munged(user_ns, cred->egid),
194 from_kgid_munged(user_ns, cred->sgid),
195 from_kgid_munged(user_ns, cred->fsgid));
196
197 task_lock(p);
198 if (p->files)
199 fdt = files_fdtable(p->files);
200 seq_printf(m,
201 "FDSize:\t%d\n"
202 "Groups:\t",
203 fdt ? fdt->max_fds : 0);
204 rcu_read_unlock();
205
206 group_info = cred->group_info;
207 task_unlock(p);
208
209 for (g = 0; g < group_info->ngroups; g++)
210 seq_printf(m, "%d ",
211 from_kgid_munged(user_ns, GROUP_AT(group_info, g)));
212 put_cred(cred);
213
214 seq_putc(m, '\n');
215}
216
217void render_sigset_t(struct seq_file *m, const char *header,
218 sigset_t *set)
219{
220 int i;
221
222 seq_puts(m, header);
223
224 i = _NSIG;
225 do {
226 int x = 0;
227
228 i -= 4;
229 if (sigismember(set, i+1)) x |= 1;
230 if (sigismember(set, i+2)) x |= 2;
231 if (sigismember(set, i+3)) x |= 4;
232 if (sigismember(set, i+4)) x |= 8;
233 seq_printf(m, "%x", x);
234 } while (i >= 4);
235
236 seq_putc(m, '\n');
237}
238
239static void collect_sigign_sigcatch(struct task_struct *p, sigset_t *ign,
240 sigset_t *catch)
241{
242 struct k_sigaction *k;
243 int i;
244
245 k = p->sighand->action;
246 for (i = 1; i <= _NSIG; ++i, ++k) {
247 if (k->sa.sa_handler == SIG_IGN)
248 sigaddset(ign, i);
249 else if (k->sa.sa_handler != SIG_DFL)
250 sigaddset(catch, i);
251 }
252}
253
254static inline void task_sig(struct seq_file *m, struct task_struct *p)
255{
256 unsigned long flags;
257 sigset_t pending, shpending, blocked, ignored, caught;
258 int num_threads = 0;
259 unsigned long qsize = 0;
260 unsigned long qlim = 0;
261
262 sigemptyset(&pending);
263 sigemptyset(&shpending);
264 sigemptyset(&blocked);
265 sigemptyset(&ignored);
266 sigemptyset(&caught);
267
268 if (lock_task_sighand(p, &flags)) {
269 pending = p->pending.signal;
270 shpending = p->signal->shared_pending.signal;
271 blocked = p->blocked;
272 collect_sigign_sigcatch(p, &ignored, &caught);
273 num_threads = get_nr_threads(p);
274 rcu_read_lock();
275 qsize = atomic_read(&__task_cred(p)->user->sigpending);
276 rcu_read_unlock();
277 qlim = task_rlimit(p, RLIMIT_SIGPENDING);
278 unlock_task_sighand(p, &flags);
279 }
280
281 seq_printf(m, "Threads:\t%d\n", num_threads);
282 seq_printf(m, "SigQ:\t%lu/%lu\n", qsize, qlim);
283
284
285 render_sigset_t(m, "SigPnd:\t", &pending);
286 render_sigset_t(m, "ShdPnd:\t", &shpending);
287 render_sigset_t(m, "SigBlk:\t", &blocked);
288 render_sigset_t(m, "SigIgn:\t", &ignored);
289 render_sigset_t(m, "SigCgt:\t", &caught);
290}
291
292static void render_cap_t(struct seq_file *m, const char *header,
293 kernel_cap_t *a)
294{
295 unsigned __capi;
296
297 seq_puts(m, header);
298 CAP_FOR_EACH_U32(__capi) {
299 seq_printf(m, "%08x",
300 a->cap[CAP_LAST_U32 - __capi]);
301 }
302 seq_putc(m, '\n');
303}
304
305static inline void task_cap(struct seq_file *m, struct task_struct *p)
306{
307 const struct cred *cred;
308 kernel_cap_t cap_inheritable, cap_permitted, cap_effective, cap_bset;
309
310 rcu_read_lock();
311 cred = __task_cred(p);
312 cap_inheritable = cred->cap_inheritable;
313 cap_permitted = cred->cap_permitted;
314 cap_effective = cred->cap_effective;
315 cap_bset = cred->cap_bset;
316 rcu_read_unlock();
317
318 render_cap_t(m, "CapInh:\t", &cap_inheritable);
319 render_cap_t(m, "CapPrm:\t", &cap_permitted);
320 render_cap_t(m, "CapEff:\t", &cap_effective);
321 render_cap_t(m, "CapBnd:\t", &cap_bset);
322}
323
324static inline void task_seccomp(struct seq_file *m, struct task_struct *p)
325{
326#ifdef CONFIG_SECCOMP
327 seq_printf(m, "Seccomp:\t%d\n", p->seccomp.mode);
328#endif
329}
330
331static inline void task_context_switch_counts(struct seq_file *m,
332 struct task_struct *p)
333{
334 seq_printf(m, "voluntary_ctxt_switches:\t%lu\n"
335 "nonvoluntary_ctxt_switches:\t%lu\n",
336 p->nvcsw,
337 p->nivcsw);
338}
339
340static void task_cpus_allowed(struct seq_file *m, struct task_struct *task)
341{
342 seq_puts(m, "Cpus_allowed:\t");
343 seq_cpumask(m, &task->cpus_allowed);
344 seq_putc(m, '\n');
345 seq_puts(m, "Cpus_allowed_list:\t");
346 seq_cpumask_list(m, &task->cpus_allowed);
347 seq_putc(m, '\n');
348}
349
350int proc_pid_status(struct seq_file *m, struct pid_namespace *ns,
351 struct pid *pid, struct task_struct *task)
352{
353 struct mm_struct *mm = get_task_mm(task);
354
355 task_name(m, task);
356 task_state(m, ns, pid, task);
357
358 if (mm) {
359 task_mem(m, mm);
360 mmput(mm);
361 }
362 task_sig(m, task);
363 task_cap(m, task);
364 task_seccomp(m, task);
365 task_cpus_allowed(m, task);
366 cpuset_task_status_allowed(m, task);
367 task_context_switch_counts(m, task);
368 return 0;
369}
370
371static int do_task_stat(struct seq_file *m, struct pid_namespace *ns,
372 struct pid *pid, struct task_struct *task, int whole)
373{
374 unsigned long vsize, eip, esp, wchan = ~0UL;
375 int priority, nice;
376 int tty_pgrp = -1, tty_nr = 0;
377 sigset_t sigign, sigcatch;
378 char state;
379 pid_t ppid = 0, pgid = -1, sid = -1;
380 int num_threads = 0;
381 int permitted;
382 struct mm_struct *mm;
383 unsigned long long start_time;
384 unsigned long cmin_flt = 0, cmaj_flt = 0;
385 unsigned long min_flt = 0, maj_flt = 0;
386 cputime_t cutime, cstime, utime, stime;
387 cputime_t cgtime, gtime;
388 unsigned long rsslim = 0;
389 char tcomm[sizeof(task->comm)];
390 unsigned long flags;
391
392 state = *get_task_state(task);
393 vsize = eip = esp = 0;
394 permitted = ptrace_may_access(task, PTRACE_MODE_READ | PTRACE_MODE_NOAUDIT);
395 mm = get_task_mm(task);
396 if (mm) {
397 vsize = task_vsize(mm);
398 if (permitted) {
399 eip = KSTK_EIP(task);
400 esp = KSTK_ESP(task);
401 }
402 }
403
404 get_task_comm(tcomm, task);
405
406 sigemptyset(&sigign);
407 sigemptyset(&sigcatch);
408 cutime = cstime = utime = stime = 0;
409 cgtime = gtime = 0;
410
411 if (lock_task_sighand(task, &flags)) {
412 struct signal_struct *sig = task->signal;
413
414 if (sig->tty) {
415 struct pid *pgrp = tty_get_pgrp(sig->tty);
416 tty_pgrp = pid_nr_ns(pgrp, ns);
417 put_pid(pgrp);
418 tty_nr = new_encode_dev(tty_devnum(sig->tty));
419 }
420
421 num_threads = get_nr_threads(task);
422 collect_sigign_sigcatch(task, &sigign, &sigcatch);
423
424 cmin_flt = sig->cmin_flt;
425 cmaj_flt = sig->cmaj_flt;
426 cutime = sig->cutime;
427 cstime = sig->cstime;
428 cgtime = sig->cgtime;
429 rsslim = ACCESS_ONCE(sig->rlim[RLIMIT_RSS].rlim_cur);
430
431
432 if (whole) {
433 struct task_struct *t = task;
434 do {
435 min_flt += t->min_flt;
436 maj_flt += t->maj_flt;
437 gtime += task_gtime(t);
438 } while_each_thread(task, t);
439
440 min_flt += sig->min_flt;
441 maj_flt += sig->maj_flt;
442 thread_group_cputime_adjusted(task, &utime, &stime);
443 gtime += sig->gtime;
444 }
445
446 sid = task_session_nr_ns(task, ns);
447 ppid = task_tgid_nr_ns(task->real_parent, ns);
448 pgid = task_pgrp_nr_ns(task, ns);
449
450 unlock_task_sighand(task, &flags);
451 }
452
453 if (permitted && (!whole || num_threads < 2))
454 wchan = get_wchan(task);
455 if (!whole) {
456 min_flt = task->min_flt;
457 maj_flt = task->maj_flt;
458 task_cputime_adjusted(task, &utime, &stime);
459 gtime = task_gtime(task);
460 }
461
462
463
464 priority = task_prio(task);
465 nice = task_nice(task);
466
467
468 start_time = nsec_to_clock_t(task->real_start_time);
469
470 seq_printf(m, "%d (%s) %c", pid_nr_ns(pid, ns), tcomm, state);
471 seq_put_decimal_ll(m, ' ', ppid);
472 seq_put_decimal_ll(m, ' ', pgid);
473 seq_put_decimal_ll(m, ' ', sid);
474 seq_put_decimal_ll(m, ' ', tty_nr);
475 seq_put_decimal_ll(m, ' ', tty_pgrp);
476 seq_put_decimal_ull(m, ' ', task->flags);
477 seq_put_decimal_ull(m, ' ', min_flt);
478 seq_put_decimal_ull(m, ' ', cmin_flt);
479 seq_put_decimal_ull(m, ' ', maj_flt);
480 seq_put_decimal_ull(m, ' ', cmaj_flt);
481 seq_put_decimal_ull(m, ' ', cputime_to_clock_t(utime));
482 seq_put_decimal_ull(m, ' ', cputime_to_clock_t(stime));
483 seq_put_decimal_ll(m, ' ', cputime_to_clock_t(cutime));
484 seq_put_decimal_ll(m, ' ', cputime_to_clock_t(cstime));
485 seq_put_decimal_ll(m, ' ', priority);
486 seq_put_decimal_ll(m, ' ', nice);
487 seq_put_decimal_ll(m, ' ', num_threads);
488 seq_put_decimal_ull(m, ' ', 0);
489 seq_put_decimal_ull(m, ' ', start_time);
490 seq_put_decimal_ull(m, ' ', vsize);
491 seq_put_decimal_ull(m, ' ', mm ? get_mm_rss(mm) : 0);
492 seq_put_decimal_ull(m, ' ', rsslim);
493 seq_put_decimal_ull(m, ' ', mm ? (permitted ? mm->start_code : 1) : 0);
494 seq_put_decimal_ull(m, ' ', mm ? (permitted ? mm->end_code : 1) : 0);
495 seq_put_decimal_ull(m, ' ', (permitted && mm) ? mm->start_stack : 0);
496 seq_put_decimal_ull(m, ' ', esp);
497 seq_put_decimal_ull(m, ' ', eip);
498
499
500
501
502 seq_put_decimal_ull(m, ' ', task->pending.signal.sig[0] & 0x7fffffffUL);
503 seq_put_decimal_ull(m, ' ', task->blocked.sig[0] & 0x7fffffffUL);
504 seq_put_decimal_ull(m, ' ', sigign.sig[0] & 0x7fffffffUL);
505 seq_put_decimal_ull(m, ' ', sigcatch.sig[0] & 0x7fffffffUL);
506 seq_put_decimal_ull(m, ' ', wchan);
507 seq_put_decimal_ull(m, ' ', 0);
508 seq_put_decimal_ull(m, ' ', 0);
509 seq_put_decimal_ll(m, ' ', task->exit_signal);
510 seq_put_decimal_ll(m, ' ', task_cpu(task));
511 seq_put_decimal_ull(m, ' ', task->rt_priority);
512 seq_put_decimal_ull(m, ' ', task->policy);
513 seq_put_decimal_ull(m, ' ', delayacct_blkio_ticks(task));
514 seq_put_decimal_ull(m, ' ', cputime_to_clock_t(gtime));
515 seq_put_decimal_ll(m, ' ', cputime_to_clock_t(cgtime));
516
517 if (mm && permitted) {
518 seq_put_decimal_ull(m, ' ', mm->start_data);
519 seq_put_decimal_ull(m, ' ', mm->end_data);
520 seq_put_decimal_ull(m, ' ', mm->start_brk);
521 seq_put_decimal_ull(m, ' ', mm->arg_start);
522 seq_put_decimal_ull(m, ' ', mm->arg_end);
523 seq_put_decimal_ull(m, ' ', mm->env_start);
524 seq_put_decimal_ull(m, ' ', mm->env_end);
525 } else
526 seq_printf(m, " 0 0 0 0 0 0 0");
527
528 if (permitted)
529 seq_put_decimal_ll(m, ' ', task->exit_code);
530 else
531 seq_put_decimal_ll(m, ' ', 0);
532
533 seq_putc(m, '\n');
534 if (mm)
535 mmput(mm);
536 return 0;
537}
538
539int proc_tid_stat(struct seq_file *m, struct pid_namespace *ns,
540 struct pid *pid, struct task_struct *task)
541{
542 return do_task_stat(m, ns, pid, task, 0);
543}
544
545int proc_tgid_stat(struct seq_file *m, struct pid_namespace *ns,
546 struct pid *pid, struct task_struct *task)
547{
548 return do_task_stat(m, ns, pid, task, 1);
549}
550
551int proc_pid_statm(struct seq_file *m, struct pid_namespace *ns,
552 struct pid *pid, struct task_struct *task)
553{
554 unsigned long size = 0, resident = 0, shared = 0, text = 0, data = 0;
555 struct mm_struct *mm = get_task_mm(task);
556
557 if (mm) {
558 size = task_statm(mm, &shared, &text, &data, &resident);
559 mmput(mm);
560 }
561
562
563
564
565
566
567 seq_put_decimal_ull(m, 0, size);
568 seq_put_decimal_ull(m, ' ', resident);
569 seq_put_decimal_ull(m, ' ', shared);
570 seq_put_decimal_ull(m, ' ', text);
571 seq_put_decimal_ull(m, ' ', 0);
572 seq_put_decimal_ull(m, ' ', data);
573 seq_put_decimal_ull(m, ' ', 0);
574 seq_putc(m, '\n');
575
576 return 0;
577}
578
579#ifdef CONFIG_CHECKPOINT_RESTORE
580static struct pid *
581get_children_pid(struct inode *inode, struct pid *pid_prev, loff_t pos)
582{
583 struct task_struct *start, *task;
584 struct pid *pid = NULL;
585
586 read_lock(&tasklist_lock);
587
588 start = pid_task(proc_pid(inode), PIDTYPE_PID);
589 if (!start)
590 goto out;
591
592
593
594
595
596 if (pid_prev) {
597 task = pid_task(pid_prev, PIDTYPE_PID);
598 if (task && task->real_parent == start &&
599 !(list_empty(&task->sibling))) {
600 if (list_is_last(&task->sibling, &start->children))
601 goto out;
602 task = list_first_entry(&task->sibling,
603 struct task_struct, sibling);
604 pid = get_pid(task_pid(task));
605 goto out;
606 }
607 }
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624 list_for_each_entry(task, &start->children, sibling) {
625 if (pos-- == 0) {
626 pid = get_pid(task_pid(task));
627 break;
628 }
629 }
630
631out:
632 read_unlock(&tasklist_lock);
633 return pid;
634}
635
636static int children_seq_show(struct seq_file *seq, void *v)
637{
638 struct inode *inode = seq->private;
639 pid_t pid;
640
641 pid = pid_nr_ns(v, inode->i_sb->s_fs_info);
642 return seq_printf(seq, "%d ", pid);
643}
644
645static void *children_seq_start(struct seq_file *seq, loff_t *pos)
646{
647 return get_children_pid(seq->private, NULL, *pos);
648}
649
650static void *children_seq_next(struct seq_file *seq, void *v, loff_t *pos)
651{
652 struct pid *pid;
653
654 pid = get_children_pid(seq->private, v, *pos + 1);
655 put_pid(v);
656
657 ++*pos;
658 return pid;
659}
660
661static void children_seq_stop(struct seq_file *seq, void *v)
662{
663 put_pid(v);
664}
665
666static const struct seq_operations children_seq_ops = {
667 .start = children_seq_start,
668 .next = children_seq_next,
669 .stop = children_seq_stop,
670 .show = children_seq_show,
671};
672
673static int children_seq_open(struct inode *inode, struct file *file)
674{
675 struct seq_file *m;
676 int ret;
677
678 ret = seq_open(file, &children_seq_ops);
679 if (ret)
680 return ret;
681
682 m = file->private_data;
683 m->private = inode;
684
685 return ret;
686}
687
688int children_seq_release(struct inode *inode, struct file *file)
689{
690 seq_release(inode, file);
691 return 0;
692}
693
694const struct file_operations proc_tid_children_operations = {
695 .open = children_seq_open,
696 .read = seq_read,
697 .llseek = seq_lseek,
698 .release = children_seq_release,
699};
700#endif
701