Line data Source code
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 :
95 : #include <asm/processor.h>
96 : #include "internal.h"
97 :
98 0 : void proc_task_name(struct seq_file *m, struct task_struct *p, bool escape)
99 : {
100 : char tcomm[64];
101 :
102 : /*
103 : * Test before PF_KTHREAD because all workqueue worker threads are
104 : * kernel threads.
105 : */
106 0 : if (p->flags & PF_WQ_WORKER)
107 0 : wq_worker_comm(tcomm, sizeof(tcomm), p);
108 0 : else if (p->flags & PF_KTHREAD)
109 0 : get_kthread_comm(tcomm, sizeof(tcomm), p);
110 : else
111 0 : __get_task_comm(tcomm, sizeof(tcomm), p);
112 :
113 0 : if (escape)
114 : seq_escape_str(m, tcomm, ESCAPE_SPACE | ESCAPE_SPECIAL, "\n\\");
115 : else
116 0 : seq_printf(m, "%.64s", tcomm);
117 0 : }
118 :
119 : /*
120 : * The task state array is a strange "bitmap" of
121 : * reasons to sleep. Thus "running" is zero, and
122 : * you can test for combinations of others with
123 : * simple bit tests.
124 : */
125 : static const char * const task_state_array[] = {
126 :
127 : /* states in TASK_REPORT: */
128 : "R (running)", /* 0x00 */
129 : "S (sleeping)", /* 0x01 */
130 : "D (disk sleep)", /* 0x02 */
131 : "T (stopped)", /* 0x04 */
132 : "t (tracing stop)", /* 0x08 */
133 : "X (dead)", /* 0x10 */
134 : "Z (zombie)", /* 0x20 */
135 : "P (parked)", /* 0x40 */
136 :
137 : /* states beyond TASK_REPORT: */
138 : "I (idle)", /* 0x80 */
139 : };
140 :
141 : static inline const char *get_task_state(struct task_struct *tsk)
142 : {
143 : BUILD_BUG_ON(1 + ilog2(TASK_REPORT_MAX) != ARRAY_SIZE(task_state_array));
144 0 : return task_state_array[task_state_index(tsk)];
145 : }
146 :
147 0 : static inline void task_state(struct seq_file *m, struct pid_namespace *ns,
148 : struct pid *pid, struct task_struct *p)
149 : {
150 0 : struct user_namespace *user_ns = seq_user_ns(m);
151 : struct group_info *group_info;
152 0 : int g, umask = -1;
153 : struct task_struct *tracer;
154 : const struct cred *cred;
155 0 : pid_t ppid, tpid = 0, tgid, ngid;
156 0 : unsigned int max_fds = 0;
157 :
158 : rcu_read_lock();
159 0 : ppid = pid_alive(p) ?
160 0 : task_tgid_nr_ns(rcu_dereference(p->real_parent), ns) : 0;
161 :
162 0 : tracer = ptrace_parent(p);
163 0 : if (tracer)
164 0 : tpid = task_pid_nr_ns(tracer, ns);
165 :
166 0 : tgid = task_tgid_nr_ns(p, ns);
167 0 : ngid = task_numa_group_id(p);
168 0 : cred = get_task_cred(p);
169 :
170 0 : task_lock(p);
171 0 : if (p->fs)
172 0 : umask = p->fs->umask;
173 0 : if (p->files)
174 0 : max_fds = files_fdtable(p->files)->max_fds;
175 0 : task_unlock(p);
176 : rcu_read_unlock();
177 :
178 0 : if (umask >= 0)
179 0 : seq_printf(m, "Umask:\t%#04o\n", umask);
180 0 : seq_puts(m, "State:\t");
181 0 : seq_puts(m, get_task_state(p));
182 :
183 0 : seq_put_decimal_ull(m, "\nTgid:\t", tgid);
184 0 : seq_put_decimal_ull(m, "\nNgid:\t", ngid);
185 0 : seq_put_decimal_ull(m, "\nPid:\t", pid_nr_ns(pid, ns));
186 0 : seq_put_decimal_ull(m, "\nPPid:\t", ppid);
187 0 : seq_put_decimal_ull(m, "\nTracerPid:\t", tpid);
188 0 : seq_put_decimal_ull(m, "\nUid:\t", from_kuid_munged(user_ns, cred->uid));
189 0 : seq_put_decimal_ull(m, "\t", from_kuid_munged(user_ns, cred->euid));
190 0 : seq_put_decimal_ull(m, "\t", from_kuid_munged(user_ns, cred->suid));
191 0 : seq_put_decimal_ull(m, "\t", from_kuid_munged(user_ns, cred->fsuid));
192 0 : seq_put_decimal_ull(m, "\nGid:\t", from_kgid_munged(user_ns, cred->gid));
193 0 : seq_put_decimal_ull(m, "\t", from_kgid_munged(user_ns, cred->egid));
194 0 : seq_put_decimal_ull(m, "\t", from_kgid_munged(user_ns, cred->sgid));
195 0 : seq_put_decimal_ull(m, "\t", from_kgid_munged(user_ns, cred->fsgid));
196 0 : seq_put_decimal_ull(m, "\nFDSize:\t", max_fds);
197 :
198 0 : seq_puts(m, "\nGroups:\t");
199 0 : group_info = cred->group_info;
200 0 : for (g = 0; g < group_info->ngroups; g++)
201 0 : seq_put_decimal_ull(m, g ? " " : "",
202 0 : from_kgid_munged(user_ns, group_info->gid[g]));
203 0 : put_cred(cred);
204 : /* Trailing space shouldn't have been added in the first place. */
205 0 : seq_putc(m, ' ');
206 :
207 : #ifdef CONFIG_PID_NS
208 0 : seq_puts(m, "\nNStgid:");
209 0 : for (g = ns->level; g <= pid->level; g++)
210 0 : seq_put_decimal_ull(m, "\t", task_tgid_nr_ns(p, pid->numbers[g].ns));
211 0 : seq_puts(m, "\nNSpid:");
212 0 : for (g = ns->level; g <= pid->level; g++)
213 0 : seq_put_decimal_ull(m, "\t", task_pid_nr_ns(p, pid->numbers[g].ns));
214 0 : seq_puts(m, "\nNSpgid:");
215 0 : for (g = ns->level; g <= pid->level; g++)
216 0 : seq_put_decimal_ull(m, "\t", task_pgrp_nr_ns(p, pid->numbers[g].ns));
217 0 : seq_puts(m, "\nNSsid:");
218 0 : for (g = ns->level; g <= pid->level; g++)
219 0 : seq_put_decimal_ull(m, "\t", task_session_nr_ns(p, pid->numbers[g].ns));
220 : #endif
221 0 : seq_putc(m, '\n');
222 0 : }
223 :
224 0 : void render_sigset_t(struct seq_file *m, const char *header,
225 : sigset_t *set)
226 : {
227 : int i;
228 :
229 0 : seq_puts(m, header);
230 :
231 0 : i = _NSIG;
232 : do {
233 0 : int x = 0;
234 :
235 0 : i -= 4;
236 0 : if (sigismember(set, i+1)) x |= 1;
237 0 : if (sigismember(set, i+2)) x |= 2;
238 0 : if (sigismember(set, i+3)) x |= 4;
239 0 : if (sigismember(set, i+4)) x |= 8;
240 0 : seq_putc(m, hex_asc[x]);
241 0 : } while (i >= 4);
242 :
243 0 : seq_putc(m, '\n');
244 0 : }
245 :
246 : static void collect_sigign_sigcatch(struct task_struct *p, sigset_t *sigign,
247 : sigset_t *sigcatch)
248 : {
249 : struct k_sigaction *k;
250 : int i;
251 :
252 0 : k = p->sighand->action;
253 0 : for (i = 1; i <= _NSIG; ++i, ++k) {
254 0 : if (k->sa.sa_handler == SIG_IGN)
255 : sigaddset(sigign, i);
256 0 : else if (k->sa.sa_handler != SIG_DFL)
257 : sigaddset(sigcatch, i);
258 : }
259 : }
260 :
261 0 : static inline void task_sig(struct seq_file *m, struct task_struct *p)
262 : {
263 : unsigned long flags;
264 : sigset_t pending, shpending, blocked, ignored, caught;
265 0 : int num_threads = 0;
266 0 : unsigned int qsize = 0;
267 0 : unsigned long qlim = 0;
268 :
269 0 : sigemptyset(&pending);
270 0 : sigemptyset(&shpending);
271 0 : sigemptyset(&blocked);
272 0 : sigemptyset(&ignored);
273 0 : sigemptyset(&caught);
274 :
275 0 : if (lock_task_sighand(p, &flags)) {
276 0 : pending = p->pending.signal;
277 0 : shpending = p->signal->shared_pending.signal;
278 0 : blocked = p->blocked;
279 0 : collect_sigign_sigcatch(p, &ignored, &caught);
280 0 : num_threads = get_nr_threads(p);
281 : rcu_read_lock(); /* FIXME: is this correct? */
282 0 : qsize = get_rlimit_value(task_ucounts(p), UCOUNT_RLIMIT_SIGPENDING);
283 : rcu_read_unlock();
284 0 : qlim = task_rlimit(p, RLIMIT_SIGPENDING);
285 0 : unlock_task_sighand(p, &flags);
286 : }
287 :
288 0 : seq_put_decimal_ull(m, "Threads:\t", num_threads);
289 0 : seq_put_decimal_ull(m, "\nSigQ:\t", qsize);
290 0 : seq_put_decimal_ull(m, "/", qlim);
291 :
292 : /* render them all */
293 0 : render_sigset_t(m, "\nSigPnd:\t", &pending);
294 0 : render_sigset_t(m, "ShdPnd:\t", &shpending);
295 0 : render_sigset_t(m, "SigBlk:\t", &blocked);
296 0 : render_sigset_t(m, "SigIgn:\t", &ignored);
297 0 : render_sigset_t(m, "SigCgt:\t", &caught);
298 0 : }
299 :
300 0 : static void render_cap_t(struct seq_file *m, const char *header,
301 : kernel_cap_t *a)
302 : {
303 0 : seq_puts(m, header);
304 0 : seq_put_hex_ll(m, NULL, a->val, 16);
305 0 : seq_putc(m, '\n');
306 0 : }
307 :
308 0 : 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 0 : cred = __task_cred(p);
316 0 : cap_inheritable = cred->cap_inheritable;
317 0 : cap_permitted = cred->cap_permitted;
318 0 : cap_effective = cred->cap_effective;
319 0 : cap_bset = cred->cap_bset;
320 0 : cap_ambient = cred->cap_ambient;
321 : rcu_read_unlock();
322 :
323 0 : render_cap_t(m, "CapInh:\t", &cap_inheritable);
324 0 : render_cap_t(m, "CapPrm:\t", &cap_permitted);
325 0 : render_cap_t(m, "CapEff:\t", &cap_effective);
326 0 : render_cap_t(m, "CapBnd:\t", &cap_bset);
327 0 : render_cap_t(m, "CapAmb:\t", &cap_ambient);
328 0 : }
329 :
330 0 : static inline void task_seccomp(struct seq_file *m, struct task_struct *p)
331 : {
332 0 : seq_put_decimal_ull(m, "NoNewPrivs:\t", task_no_new_privs(p));
333 : #ifdef CONFIG_SECCOMP
334 0 : 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 0 : seq_puts(m, "\nSpeculation_Store_Bypass:\t");
341 0 : switch (arch_prctl_spec_ctrl_get(p, PR_SPEC_STORE_BYPASS)) {
342 : case -EINVAL:
343 0 : seq_puts(m, "unknown");
344 0 : break;
345 : case PR_SPEC_NOT_AFFECTED:
346 0 : seq_puts(m, "not vulnerable");
347 0 : break;
348 : case PR_SPEC_PRCTL | PR_SPEC_FORCE_DISABLE:
349 0 : seq_puts(m, "thread force mitigated");
350 0 : break;
351 : case PR_SPEC_PRCTL | PR_SPEC_DISABLE:
352 0 : seq_puts(m, "thread mitigated");
353 0 : break;
354 : case PR_SPEC_PRCTL | PR_SPEC_ENABLE:
355 0 : seq_puts(m, "thread vulnerable");
356 0 : break;
357 : case PR_SPEC_DISABLE:
358 0 : seq_puts(m, "globally mitigated");
359 0 : break;
360 : default:
361 0 : seq_puts(m, "vulnerable");
362 0 : break;
363 : }
364 :
365 0 : seq_puts(m, "\nSpeculationIndirectBranch:\t");
366 0 : switch (arch_prctl_spec_ctrl_get(p, PR_SPEC_INDIRECT_BRANCH)) {
367 : case -EINVAL:
368 0 : seq_puts(m, "unsupported");
369 0 : break;
370 : case PR_SPEC_NOT_AFFECTED:
371 0 : seq_puts(m, "not affected");
372 0 : break;
373 : case PR_SPEC_PRCTL | PR_SPEC_FORCE_DISABLE:
374 0 : seq_puts(m, "conditional force disabled");
375 0 : break;
376 : case PR_SPEC_PRCTL | PR_SPEC_DISABLE:
377 0 : seq_puts(m, "conditional disabled");
378 0 : break;
379 : case PR_SPEC_PRCTL | PR_SPEC_ENABLE:
380 0 : seq_puts(m, "conditional enabled");
381 0 : break;
382 : case PR_SPEC_ENABLE:
383 0 : seq_puts(m, "always enabled");
384 0 : break;
385 : case PR_SPEC_DISABLE:
386 0 : seq_puts(m, "always disabled");
387 0 : break;
388 : default:
389 0 : seq_puts(m, "unknown");
390 0 : break;
391 : }
392 0 : seq_putc(m, '\n');
393 0 : }
394 :
395 0 : static inline void task_context_switch_counts(struct seq_file *m,
396 : struct task_struct *p)
397 : {
398 0 : seq_put_decimal_ull(m, "voluntary_ctxt_switches:\t", p->nvcsw);
399 0 : seq_put_decimal_ull(m, "\nnonvoluntary_ctxt_switches:\t", p->nivcsw);
400 0 : seq_putc(m, '\n');
401 0 : }
402 :
403 0 : static void task_cpus_allowed(struct seq_file *m, struct task_struct *task)
404 : {
405 0 : seq_printf(m, "Cpus_allowed:\t%*pb\n",
406 0 : cpumask_pr_args(&task->cpus_mask));
407 0 : seq_printf(m, "Cpus_allowed_list:\t%*pbl\n",
408 : cpumask_pr_args(&task->cpus_mask));
409 0 : }
410 :
411 0 : static inline void task_core_dumping(struct seq_file *m, struct task_struct *task)
412 : {
413 0 : seq_put_decimal_ull(m, "CoreDumping:\t", !!task->signal->core_state);
414 0 : seq_putc(m, '\n');
415 0 : }
416 :
417 : static inline void task_thp_status(struct seq_file *m, struct mm_struct *mm)
418 : {
419 0 : bool thp_enabled = IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE);
420 :
421 : if (thp_enabled)
422 : thp_enabled = !test_bit(MMF_DISABLE_THP, &mm->flags);
423 0 : seq_printf(m, "THP_enabled:\t%d\n", thp_enabled);
424 : }
425 :
426 0 : int proc_pid_status(struct seq_file *m, struct pid_namespace *ns,
427 : struct pid *pid, struct task_struct *task)
428 : {
429 0 : struct mm_struct *mm = get_task_mm(task);
430 :
431 0 : seq_puts(m, "Name:\t");
432 0 : proc_task_name(m, task, true);
433 0 : seq_putc(m, '\n');
434 :
435 0 : task_state(m, ns, pid, task);
436 :
437 0 : if (mm) {
438 0 : task_mem(m, mm);
439 0 : task_core_dumping(m, task);
440 0 : task_thp_status(m, mm);
441 0 : mmput(mm);
442 : }
443 0 : task_sig(m, task);
444 0 : task_cap(m, task);
445 0 : task_seccomp(m, task);
446 0 : task_cpus_allowed(m, task);
447 0 : cpuset_task_status_allowed(m, task);
448 0 : task_context_switch_counts(m, task);
449 0 : return 0;
450 : }
451 :
452 0 : 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 0 : unsigned long vsize, eip, esp, wchan = 0;
456 : int priority, nice;
457 0 : int tty_pgrp = -1, tty_nr = 0;
458 : sigset_t sigign, sigcatch;
459 : char state;
460 0 : pid_t ppid = 0, pgid = -1, sid = -1;
461 0 : int num_threads = 0;
462 : int permitted;
463 : struct mm_struct *mm;
464 : unsigned long long start_time;
465 0 : unsigned long cmin_flt = 0, cmaj_flt = 0;
466 0 : unsigned long min_flt = 0, maj_flt = 0;
467 : u64 cutime, cstime, utime, stime;
468 : u64 cgtime, gtime;
469 0 : unsigned long rsslim = 0;
470 : unsigned long flags;
471 0 : int exit_code = task->exit_code;
472 :
473 0 : state = *get_task_state(task);
474 0 : vsize = eip = esp = 0;
475 0 : permitted = ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS | PTRACE_MODE_NOAUDIT);
476 0 : mm = get_task_mm(task);
477 0 : if (mm) {
478 0 : vsize = task_vsize(mm);
479 : /*
480 : * esp and eip are intentionally zeroed out. There is no
481 : * non-racy way to read them without freezing the task.
482 : * Programs that need reliable values can use ptrace(2).
483 : *
484 : * The only exception is if the task is core dumping because
485 : * a program is not able to use ptrace(2) in that case. It is
486 : * safe because the task has stopped executing permanently.
487 : */
488 0 : if (permitted && (task->flags & (PF_EXITING|PF_DUMPCORE))) {
489 0 : if (try_get_task_stack(task)) {
490 0 : eip = KSTK_EIP(task);
491 0 : esp = KSTK_ESP(task);
492 0 : put_task_stack(task);
493 : }
494 : }
495 : }
496 :
497 0 : sigemptyset(&sigign);
498 0 : sigemptyset(&sigcatch);
499 0 : cutime = cstime = utime = stime = 0;
500 0 : cgtime = gtime = 0;
501 :
502 0 : if (lock_task_sighand(task, &flags)) {
503 0 : struct signal_struct *sig = task->signal;
504 :
505 0 : if (sig->tty) {
506 0 : struct pid *pgrp = tty_get_pgrp(sig->tty);
507 0 : tty_pgrp = pid_nr_ns(pgrp, ns);
508 0 : put_pid(pgrp);
509 0 : tty_nr = new_encode_dev(tty_devnum(sig->tty));
510 : }
511 :
512 0 : num_threads = get_nr_threads(task);
513 0 : collect_sigign_sigcatch(task, &sigign, &sigcatch);
514 :
515 0 : cmin_flt = sig->cmin_flt;
516 0 : cmaj_flt = sig->cmaj_flt;
517 0 : cutime = sig->cutime;
518 0 : cstime = sig->cstime;
519 0 : cgtime = sig->cgtime;
520 0 : rsslim = READ_ONCE(sig->rlim[RLIMIT_RSS].rlim_cur);
521 :
522 : /* add up live thread stats at the group level */
523 0 : if (whole) {
524 : struct task_struct *t = task;
525 : do {
526 0 : min_flt += t->min_flt;
527 0 : maj_flt += t->maj_flt;
528 0 : gtime += task_gtime(t);
529 0 : } while_each_thread(task, t);
530 :
531 0 : min_flt += sig->min_flt;
532 0 : maj_flt += sig->maj_flt;
533 0 : thread_group_cputime_adjusted(task, &utime, &stime);
534 0 : gtime += sig->gtime;
535 :
536 0 : if (sig->flags & (SIGNAL_GROUP_EXIT | SIGNAL_STOP_STOPPED))
537 0 : exit_code = sig->group_exit_code;
538 : }
539 :
540 0 : sid = task_session_nr_ns(task, ns);
541 0 : ppid = task_tgid_nr_ns(task->real_parent, ns);
542 0 : pgid = task_pgrp_nr_ns(task, ns);
543 :
544 0 : unlock_task_sighand(task, &flags);
545 : }
546 :
547 0 : if (permitted && (!whole || num_threads < 2))
548 0 : wchan = !task_is_running(task);
549 0 : if (!whole) {
550 0 : min_flt = task->min_flt;
551 0 : maj_flt = task->maj_flt;
552 0 : task_cputime_adjusted(task, &utime, &stime);
553 0 : gtime = task_gtime(task);
554 : }
555 :
556 : /* scale priority and nice values from timeslices to -20..20 */
557 : /* to make it look like a "normal" Unix priority/nice value */
558 0 : priority = task_prio(task);
559 0 : nice = task_nice(task);
560 :
561 : /* apply timens offset for boottime and convert nsec -> ticks */
562 0 : start_time =
563 0 : nsec_to_clock_t(timens_add_boottime_ns(task->start_boottime));
564 :
565 0 : seq_put_decimal_ull(m, "", pid_nr_ns(pid, ns));
566 0 : seq_puts(m, " (");
567 0 : proc_task_name(m, task, false);
568 0 : seq_puts(m, ") ");
569 0 : seq_putc(m, state);
570 0 : seq_put_decimal_ll(m, " ", ppid);
571 0 : seq_put_decimal_ll(m, " ", pgid);
572 0 : seq_put_decimal_ll(m, " ", sid);
573 0 : seq_put_decimal_ll(m, " ", tty_nr);
574 0 : seq_put_decimal_ll(m, " ", tty_pgrp);
575 0 : seq_put_decimal_ull(m, " ", task->flags);
576 0 : seq_put_decimal_ull(m, " ", min_flt);
577 0 : seq_put_decimal_ull(m, " ", cmin_flt);
578 0 : seq_put_decimal_ull(m, " ", maj_flt);
579 0 : seq_put_decimal_ull(m, " ", cmaj_flt);
580 0 : seq_put_decimal_ull(m, " ", nsec_to_clock_t(utime));
581 0 : seq_put_decimal_ull(m, " ", nsec_to_clock_t(stime));
582 0 : seq_put_decimal_ll(m, " ", nsec_to_clock_t(cutime));
583 0 : seq_put_decimal_ll(m, " ", nsec_to_clock_t(cstime));
584 0 : seq_put_decimal_ll(m, " ", priority);
585 0 : seq_put_decimal_ll(m, " ", nice);
586 0 : seq_put_decimal_ll(m, " ", num_threads);
587 0 : seq_put_decimal_ull(m, " ", 0);
588 0 : seq_put_decimal_ull(m, " ", start_time);
589 0 : seq_put_decimal_ull(m, " ", vsize);
590 0 : seq_put_decimal_ull(m, " ", mm ? get_mm_rss(mm) : 0);
591 0 : seq_put_decimal_ull(m, " ", rsslim);
592 0 : seq_put_decimal_ull(m, " ", mm ? (permitted ? mm->start_code : 1) : 0);
593 0 : seq_put_decimal_ull(m, " ", mm ? (permitted ? mm->end_code : 1) : 0);
594 0 : seq_put_decimal_ull(m, " ", (permitted && mm) ? mm->start_stack : 0);
595 0 : seq_put_decimal_ull(m, " ", esp);
596 0 : seq_put_decimal_ull(m, " ", eip);
597 : /* The signal information here is obsolete.
598 : * It must be decimal for Linux 2.0 compatibility.
599 : * Use /proc/#/status for real-time signals.
600 : */
601 0 : seq_put_decimal_ull(m, " ", task->pending.signal.sig[0] & 0x7fffffffUL);
602 0 : seq_put_decimal_ull(m, " ", task->blocked.sig[0] & 0x7fffffffUL);
603 0 : seq_put_decimal_ull(m, " ", sigign.sig[0] & 0x7fffffffUL);
604 0 : seq_put_decimal_ull(m, " ", sigcatch.sig[0] & 0x7fffffffUL);
605 :
606 : /*
607 : * We used to output the absolute kernel address, but that's an
608 : * information leak - so instead we show a 0/1 flag here, to signal
609 : * to user-space whether there's a wchan field in /proc/PID/wchan.
610 : *
611 : * This works with older implementations of procps as well.
612 : */
613 0 : seq_put_decimal_ull(m, " ", wchan);
614 :
615 0 : seq_put_decimal_ull(m, " ", 0);
616 0 : seq_put_decimal_ull(m, " ", 0);
617 0 : seq_put_decimal_ll(m, " ", task->exit_signal);
618 0 : seq_put_decimal_ll(m, " ", task_cpu(task));
619 0 : seq_put_decimal_ull(m, " ", task->rt_priority);
620 0 : seq_put_decimal_ull(m, " ", task->policy);
621 0 : seq_put_decimal_ull(m, " ", delayacct_blkio_ticks(task));
622 0 : seq_put_decimal_ull(m, " ", nsec_to_clock_t(gtime));
623 0 : seq_put_decimal_ll(m, " ", nsec_to_clock_t(cgtime));
624 :
625 0 : if (mm && permitted) {
626 0 : seq_put_decimal_ull(m, " ", mm->start_data);
627 0 : seq_put_decimal_ull(m, " ", mm->end_data);
628 0 : seq_put_decimal_ull(m, " ", mm->start_brk);
629 0 : seq_put_decimal_ull(m, " ", mm->arg_start);
630 0 : seq_put_decimal_ull(m, " ", mm->arg_end);
631 0 : seq_put_decimal_ull(m, " ", mm->env_start);
632 0 : seq_put_decimal_ull(m, " ", mm->env_end);
633 : } else
634 0 : seq_puts(m, " 0 0 0 0 0 0 0");
635 :
636 0 : if (permitted)
637 0 : seq_put_decimal_ll(m, " ", exit_code);
638 : else
639 0 : seq_puts(m, " 0");
640 :
641 0 : seq_putc(m, '\n');
642 0 : if (mm)
643 0 : mmput(mm);
644 0 : return 0;
645 : }
646 :
647 0 : int proc_tid_stat(struct seq_file *m, struct pid_namespace *ns,
648 : struct pid *pid, struct task_struct *task)
649 : {
650 0 : return do_task_stat(m, ns, pid, task, 0);
651 : }
652 :
653 0 : int proc_tgid_stat(struct seq_file *m, struct pid_namespace *ns,
654 : struct pid *pid, struct task_struct *task)
655 : {
656 0 : return do_task_stat(m, ns, pid, task, 1);
657 : }
658 :
659 0 : int proc_pid_statm(struct seq_file *m, struct pid_namespace *ns,
660 : struct pid *pid, struct task_struct *task)
661 : {
662 0 : struct mm_struct *mm = get_task_mm(task);
663 :
664 0 : if (mm) {
665 : unsigned long size;
666 0 : unsigned long resident = 0;
667 0 : unsigned long shared = 0;
668 0 : unsigned long text = 0;
669 0 : unsigned long data = 0;
670 :
671 0 : size = task_statm(mm, &shared, &text, &data, &resident);
672 0 : mmput(mm);
673 :
674 : /*
675 : * For quick read, open code by putting numbers directly
676 : * expected format is
677 : * seq_printf(m, "%lu %lu %lu %lu 0 %lu 0\n",
678 : * size, resident, shared, text, data);
679 : */
680 0 : seq_put_decimal_ull(m, "", size);
681 0 : seq_put_decimal_ull(m, " ", resident);
682 0 : seq_put_decimal_ull(m, " ", shared);
683 0 : seq_put_decimal_ull(m, " ", text);
684 0 : seq_put_decimal_ull(m, " ", 0);
685 0 : seq_put_decimal_ull(m, " ", data);
686 0 : seq_put_decimal_ull(m, " ", 0);
687 0 : seq_putc(m, '\n');
688 : } else {
689 0 : seq_write(m, "0 0 0 0 0 0 0\n", 14);
690 : }
691 0 : return 0;
692 : }
693 :
694 : #ifdef CONFIG_PROC_CHILDREN
695 : static struct pid *
696 : get_children_pid(struct inode *inode, struct pid *pid_prev, loff_t pos)
697 : {
698 : struct task_struct *start, *task;
699 : struct pid *pid = NULL;
700 :
701 : read_lock(&tasklist_lock);
702 :
703 : start = pid_task(proc_pid(inode), PIDTYPE_PID);
704 : if (!start)
705 : goto out;
706 :
707 : /*
708 : * Lets try to continue searching first, this gives
709 : * us significant speedup on children-rich processes.
710 : */
711 : if (pid_prev) {
712 : task = pid_task(pid_prev, PIDTYPE_PID);
713 : if (task && task->real_parent == start &&
714 : !(list_empty(&task->sibling))) {
715 : if (list_is_last(&task->sibling, &start->children))
716 : goto out;
717 : task = list_first_entry(&task->sibling,
718 : struct task_struct, sibling);
719 : pid = get_pid(task_pid(task));
720 : goto out;
721 : }
722 : }
723 :
724 : /*
725 : * Slow search case.
726 : *
727 : * We might miss some children here if children
728 : * are exited while we were not holding the lock,
729 : * but it was never promised to be accurate that
730 : * much.
731 : *
732 : * "Just suppose that the parent sleeps, but N children
733 : * exit after we printed their tids. Now the slow paths
734 : * skips N extra children, we miss N tasks." (c)
735 : *
736 : * So one need to stop or freeze the leader and all
737 : * its children to get a precise result.
738 : */
739 : list_for_each_entry(task, &start->children, sibling) {
740 : if (pos-- == 0) {
741 : pid = get_pid(task_pid(task));
742 : break;
743 : }
744 : }
745 :
746 : out:
747 : read_unlock(&tasklist_lock);
748 : return pid;
749 : }
750 :
751 : static int children_seq_show(struct seq_file *seq, void *v)
752 : {
753 : struct inode *inode = file_inode(seq->file);
754 :
755 : seq_printf(seq, "%d ", pid_nr_ns(v, proc_pid_ns(inode->i_sb)));
756 : return 0;
757 : }
758 :
759 : static void *children_seq_start(struct seq_file *seq, loff_t *pos)
760 : {
761 : return get_children_pid(file_inode(seq->file), NULL, *pos);
762 : }
763 :
764 : static void *children_seq_next(struct seq_file *seq, void *v, loff_t *pos)
765 : {
766 : struct pid *pid;
767 :
768 : pid = get_children_pid(file_inode(seq->file), v, *pos + 1);
769 : put_pid(v);
770 :
771 : ++*pos;
772 : return pid;
773 : }
774 :
775 : static void children_seq_stop(struct seq_file *seq, void *v)
776 : {
777 : put_pid(v);
778 : }
779 :
780 : static const struct seq_operations children_seq_ops = {
781 : .start = children_seq_start,
782 : .next = children_seq_next,
783 : .stop = children_seq_stop,
784 : .show = children_seq_show,
785 : };
786 :
787 : static int children_seq_open(struct inode *inode, struct file *file)
788 : {
789 : return seq_open(file, &children_seq_ops);
790 : }
791 :
792 : const struct file_operations proc_tid_children_operations = {
793 : .open = children_seq_open,
794 : .read = seq_read,
795 : .llseek = seq_lseek,
796 : .release = seq_release,
797 : };
798 : #endif /* CONFIG_PROC_CHILDREN */
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