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/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/string_helpers.h>
92 : #include <linux/user_namespace.h>
93 : #include <linux/fs_struct.h>
94 : #include <linux/kthread.h>
95 :
96 : #include <asm/processor.h>
97 : #include "internal.h"
98 :
99 0 : void proc_task_name(struct seq_file *m, struct task_struct *p, bool escape)
100 : {
101 : char tcomm[64];
102 :
103 0 : if (p->flags & PF_WQ_WORKER)
104 0 : wq_worker_comm(tcomm, sizeof(tcomm), p);
105 0 : else if (p->flags & PF_KTHREAD)
106 0 : get_kthread_comm(tcomm, sizeof(tcomm), p);
107 : else
108 0 : __get_task_comm(tcomm, sizeof(tcomm), p);
109 :
110 0 : if (escape)
111 : seq_escape_str(m, tcomm, ESCAPE_SPACE | ESCAPE_SPECIAL, "\n\\");
112 : else
113 0 : seq_printf(m, "%.64s", tcomm);
114 0 : }
115 :
116 : /*
117 : * The task state array is a strange "bitmap" of
118 : * reasons to sleep. Thus "running" is zero, and
119 : * you can test for combinations of others with
120 : * simple bit tests.
121 : */
122 : static const char * const task_state_array[] = {
123 :
124 : /* states in TASK_REPORT: */
125 : "R (running)", /* 0x00 */
126 : "S (sleeping)", /* 0x01 */
127 : "D (disk sleep)", /* 0x02 */
128 : "T (stopped)", /* 0x04 */
129 : "t (tracing stop)", /* 0x08 */
130 : "X (dead)", /* 0x10 */
131 : "Z (zombie)", /* 0x20 */
132 : "P (parked)", /* 0x40 */
133 :
134 : /* states beyond TASK_REPORT: */
135 : "I (idle)", /* 0x80 */
136 : };
137 :
138 : static inline const char *get_task_state(struct task_struct *tsk)
139 : {
140 : BUILD_BUG_ON(1 + ilog2(TASK_REPORT_MAX) != ARRAY_SIZE(task_state_array));
141 0 : return task_state_array[task_state_index(tsk)];
142 : }
143 :
144 0 : static inline void task_state(struct seq_file *m, struct pid_namespace *ns,
145 : struct pid *pid, struct task_struct *p)
146 : {
147 0 : struct user_namespace *user_ns = seq_user_ns(m);
148 : struct group_info *group_info;
149 0 : int g, umask = -1;
150 : struct task_struct *tracer;
151 : const struct cred *cred;
152 0 : pid_t ppid, tpid = 0, tgid, ngid;
153 0 : unsigned int max_fds = 0;
154 :
155 : rcu_read_lock();
156 0 : ppid = pid_alive(p) ?
157 0 : task_tgid_nr_ns(rcu_dereference(p->real_parent), ns) : 0;
158 :
159 0 : tracer = ptrace_parent(p);
160 0 : if (tracer)
161 0 : tpid = task_pid_nr_ns(tracer, ns);
162 :
163 0 : tgid = task_tgid_nr_ns(p, ns);
164 0 : ngid = task_numa_group_id(p);
165 0 : cred = get_task_cred(p);
166 :
167 0 : task_lock(p);
168 0 : if (p->fs)
169 0 : umask = p->fs->umask;
170 0 : if (p->files)
171 0 : max_fds = files_fdtable(p->files)->max_fds;
172 0 : task_unlock(p);
173 : rcu_read_unlock();
174 :
175 0 : if (umask >= 0)
176 0 : seq_printf(m, "Umask:\t%#04o\n", umask);
177 0 : seq_puts(m, "State:\t");
178 0 : seq_puts(m, get_task_state(p));
179 :
180 0 : seq_put_decimal_ull(m, "\nTgid:\t", tgid);
181 0 : seq_put_decimal_ull(m, "\nNgid:\t", ngid);
182 0 : seq_put_decimal_ull(m, "\nPid:\t", pid_nr_ns(pid, ns));
183 0 : seq_put_decimal_ull(m, "\nPPid:\t", ppid);
184 0 : seq_put_decimal_ull(m, "\nTracerPid:\t", tpid);
185 0 : seq_put_decimal_ull(m, "\nUid:\t", from_kuid_munged(user_ns, cred->uid));
186 0 : seq_put_decimal_ull(m, "\t", from_kuid_munged(user_ns, cred->euid));
187 0 : seq_put_decimal_ull(m, "\t", from_kuid_munged(user_ns, cred->suid));
188 0 : seq_put_decimal_ull(m, "\t", from_kuid_munged(user_ns, cred->fsuid));
189 0 : seq_put_decimal_ull(m, "\nGid:\t", from_kgid_munged(user_ns, cred->gid));
190 0 : seq_put_decimal_ull(m, "\t", from_kgid_munged(user_ns, cred->egid));
191 0 : seq_put_decimal_ull(m, "\t", from_kgid_munged(user_ns, cred->sgid));
192 0 : seq_put_decimal_ull(m, "\t", from_kgid_munged(user_ns, cred->fsgid));
193 0 : seq_put_decimal_ull(m, "\nFDSize:\t", max_fds);
194 :
195 0 : seq_puts(m, "\nGroups:\t");
196 0 : group_info = cred->group_info;
197 0 : for (g = 0; g < group_info->ngroups; g++)
198 0 : seq_put_decimal_ull(m, g ? " " : "",
199 0 : from_kgid_munged(user_ns, group_info->gid[g]));
200 0 : put_cred(cred);
201 : /* Trailing space shouldn't have been added in the first place. */
202 0 : seq_putc(m, ' ');
203 :
204 : #ifdef CONFIG_PID_NS
205 0 : seq_puts(m, "\nNStgid:");
206 0 : for (g = ns->level; g <= pid->level; g++)
207 0 : seq_put_decimal_ull(m, "\t", task_tgid_nr_ns(p, pid->numbers[g].ns));
208 0 : seq_puts(m, "\nNSpid:");
209 0 : for (g = ns->level; g <= pid->level; g++)
210 0 : seq_put_decimal_ull(m, "\t", task_pid_nr_ns(p, pid->numbers[g].ns));
211 0 : seq_puts(m, "\nNSpgid:");
212 0 : for (g = ns->level; g <= pid->level; g++)
213 0 : seq_put_decimal_ull(m, "\t", task_pgrp_nr_ns(p, pid->numbers[g].ns));
214 0 : seq_puts(m, "\nNSsid:");
215 0 : for (g = ns->level; g <= pid->level; g++)
216 0 : seq_put_decimal_ull(m, "\t", task_session_nr_ns(p, pid->numbers[g].ns));
217 : #endif
218 0 : seq_putc(m, '\n');
219 0 : }
220 :
221 0 : void render_sigset_t(struct seq_file *m, const char *header,
222 : sigset_t *set)
223 : {
224 : int i;
225 :
226 0 : seq_puts(m, header);
227 :
228 0 : i = _NSIG;
229 : do {
230 0 : int x = 0;
231 :
232 0 : i -= 4;
233 0 : if (sigismember(set, i+1)) x |= 1;
234 0 : if (sigismember(set, i+2)) x |= 2;
235 0 : if (sigismember(set, i+3)) x |= 4;
236 0 : if (sigismember(set, i+4)) x |= 8;
237 0 : seq_putc(m, hex_asc[x]);
238 0 : } while (i >= 4);
239 :
240 0 : seq_putc(m, '\n');
241 0 : }
242 :
243 : static void collect_sigign_sigcatch(struct task_struct *p, sigset_t *sigign,
244 : sigset_t *sigcatch)
245 : {
246 : struct k_sigaction *k;
247 : int i;
248 :
249 0 : k = p->sighand->action;
250 0 : for (i = 1; i <= _NSIG; ++i, ++k) {
251 0 : if (k->sa.sa_handler == SIG_IGN)
252 : sigaddset(sigign, i);
253 0 : else if (k->sa.sa_handler != SIG_DFL)
254 : sigaddset(sigcatch, i);
255 : }
256 : }
257 :
258 0 : static inline void task_sig(struct seq_file *m, struct task_struct *p)
259 : {
260 : unsigned long flags;
261 : sigset_t pending, shpending, blocked, ignored, caught;
262 0 : int num_threads = 0;
263 0 : unsigned int qsize = 0;
264 0 : unsigned long qlim = 0;
265 :
266 0 : sigemptyset(&pending);
267 0 : sigemptyset(&shpending);
268 0 : sigemptyset(&blocked);
269 0 : sigemptyset(&ignored);
270 0 : sigemptyset(&caught);
271 :
272 0 : if (lock_task_sighand(p, &flags)) {
273 0 : pending = p->pending.signal;
274 0 : shpending = p->signal->shared_pending.signal;
275 0 : blocked = p->blocked;
276 0 : collect_sigign_sigcatch(p, &ignored, &caught);
277 0 : num_threads = get_nr_threads(p);
278 : rcu_read_lock(); /* FIXME: is this correct? */
279 0 : qsize = get_ucounts_value(task_ucounts(p), UCOUNT_RLIMIT_SIGPENDING);
280 : rcu_read_unlock();
281 0 : qlim = task_rlimit(p, RLIMIT_SIGPENDING);
282 0 : unlock_task_sighand(p, &flags);
283 : }
284 :
285 0 : seq_put_decimal_ull(m, "Threads:\t", num_threads);
286 0 : seq_put_decimal_ull(m, "\nSigQ:\t", qsize);
287 0 : seq_put_decimal_ull(m, "/", qlim);
288 :
289 : /* render them all */
290 0 : render_sigset_t(m, "\nSigPnd:\t", &pending);
291 0 : render_sigset_t(m, "ShdPnd:\t", &shpending);
292 0 : render_sigset_t(m, "SigBlk:\t", &blocked);
293 0 : render_sigset_t(m, "SigIgn:\t", &ignored);
294 0 : render_sigset_t(m, "SigCgt:\t", &caught);
295 0 : }
296 :
297 0 : static void render_cap_t(struct seq_file *m, const char *header,
298 : kernel_cap_t *a)
299 : {
300 : unsigned __capi;
301 :
302 0 : seq_puts(m, header);
303 0 : CAP_FOR_EACH_U32(__capi) {
304 0 : seq_put_hex_ll(m, NULL,
305 0 : a->cap[CAP_LAST_U32 - __capi], 8);
306 : }
307 0 : seq_putc(m, '\n');
308 0 : }
309 :
310 0 : static inline void task_cap(struct seq_file *m, struct task_struct *p)
311 : {
312 : const struct cred *cred;
313 : kernel_cap_t cap_inheritable, cap_permitted, cap_effective,
314 : cap_bset, cap_ambient;
315 :
316 : rcu_read_lock();
317 0 : cred = __task_cred(p);
318 0 : cap_inheritable = cred->cap_inheritable;
319 0 : cap_permitted = cred->cap_permitted;
320 0 : cap_effective = cred->cap_effective;
321 0 : cap_bset = cred->cap_bset;
322 0 : cap_ambient = cred->cap_ambient;
323 : rcu_read_unlock();
324 :
325 0 : render_cap_t(m, "CapInh:\t", &cap_inheritable);
326 0 : render_cap_t(m, "CapPrm:\t", &cap_permitted);
327 0 : render_cap_t(m, "CapEff:\t", &cap_effective);
328 0 : render_cap_t(m, "CapBnd:\t", &cap_bset);
329 0 : render_cap_t(m, "CapAmb:\t", &cap_ambient);
330 0 : }
331 :
332 0 : static inline void task_seccomp(struct seq_file *m, struct task_struct *p)
333 : {
334 0 : seq_put_decimal_ull(m, "NoNewPrivs:\t", task_no_new_privs(p));
335 : #ifdef CONFIG_SECCOMP
336 0 : seq_put_decimal_ull(m, "\nSeccomp:\t", p->seccomp.mode);
337 : #ifdef CONFIG_SECCOMP_FILTER
338 : seq_put_decimal_ull(m, "\nSeccomp_filters:\t",
339 : atomic_read(&p->seccomp.filter_count));
340 : #endif
341 : #endif
342 0 : seq_puts(m, "\nSpeculation_Store_Bypass:\t");
343 0 : switch (arch_prctl_spec_ctrl_get(p, PR_SPEC_STORE_BYPASS)) {
344 : case -EINVAL:
345 0 : seq_puts(m, "unknown");
346 0 : break;
347 : case PR_SPEC_NOT_AFFECTED:
348 0 : seq_puts(m, "not vulnerable");
349 0 : break;
350 : case PR_SPEC_PRCTL | PR_SPEC_FORCE_DISABLE:
351 0 : seq_puts(m, "thread force mitigated");
352 0 : break;
353 : case PR_SPEC_PRCTL | PR_SPEC_DISABLE:
354 0 : seq_puts(m, "thread mitigated");
355 0 : break;
356 : case PR_SPEC_PRCTL | PR_SPEC_ENABLE:
357 0 : seq_puts(m, "thread vulnerable");
358 0 : break;
359 : case PR_SPEC_DISABLE:
360 0 : seq_puts(m, "globally mitigated");
361 0 : break;
362 : default:
363 0 : seq_puts(m, "vulnerable");
364 0 : break;
365 : }
366 :
367 0 : seq_puts(m, "\nSpeculationIndirectBranch:\t");
368 0 : switch (arch_prctl_spec_ctrl_get(p, PR_SPEC_INDIRECT_BRANCH)) {
369 : case -EINVAL:
370 0 : seq_puts(m, "unsupported");
371 0 : break;
372 : case PR_SPEC_NOT_AFFECTED:
373 0 : seq_puts(m, "not affected");
374 0 : break;
375 : case PR_SPEC_PRCTL | PR_SPEC_FORCE_DISABLE:
376 0 : seq_puts(m, "conditional force disabled");
377 0 : break;
378 : case PR_SPEC_PRCTL | PR_SPEC_DISABLE:
379 0 : seq_puts(m, "conditional disabled");
380 0 : break;
381 : case PR_SPEC_PRCTL | PR_SPEC_ENABLE:
382 0 : seq_puts(m, "conditional enabled");
383 0 : break;
384 : case PR_SPEC_ENABLE:
385 0 : seq_puts(m, "always enabled");
386 0 : break;
387 : case PR_SPEC_DISABLE:
388 0 : seq_puts(m, "always disabled");
389 0 : break;
390 : default:
391 0 : seq_puts(m, "unknown");
392 0 : break;
393 : }
394 0 : seq_putc(m, '\n');
395 0 : }
396 :
397 0 : static inline void task_context_switch_counts(struct seq_file *m,
398 : struct task_struct *p)
399 : {
400 0 : seq_put_decimal_ull(m, "voluntary_ctxt_switches:\t", p->nvcsw);
401 0 : seq_put_decimal_ull(m, "\nnonvoluntary_ctxt_switches:\t", p->nivcsw);
402 0 : seq_putc(m, '\n');
403 0 : }
404 :
405 0 : static void task_cpus_allowed(struct seq_file *m, struct task_struct *task)
406 : {
407 0 : seq_printf(m, "Cpus_allowed:\t%*pb\n",
408 0 : cpumask_pr_args(&task->cpus_mask));
409 0 : seq_printf(m, "Cpus_allowed_list:\t%*pbl\n",
410 : cpumask_pr_args(&task->cpus_mask));
411 0 : }
412 :
413 0 : static inline void task_core_dumping(struct seq_file *m, struct task_struct *task)
414 : {
415 0 : seq_put_decimal_ull(m, "CoreDumping:\t", !!task->signal->core_state);
416 0 : seq_putc(m, '\n');
417 0 : }
418 :
419 : static inline void task_thp_status(struct seq_file *m, struct mm_struct *mm)
420 : {
421 0 : bool thp_enabled = IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE);
422 :
423 : if (thp_enabled)
424 : thp_enabled = !test_bit(MMF_DISABLE_THP, &mm->flags);
425 0 : seq_printf(m, "THP_enabled:\t%d\n", thp_enabled);
426 : }
427 :
428 0 : int proc_pid_status(struct seq_file *m, struct pid_namespace *ns,
429 : struct pid *pid, struct task_struct *task)
430 : {
431 0 : struct mm_struct *mm = get_task_mm(task);
432 :
433 0 : seq_puts(m, "Name:\t");
434 0 : proc_task_name(m, task, true);
435 0 : seq_putc(m, '\n');
436 :
437 0 : task_state(m, ns, pid, task);
438 :
439 0 : if (mm) {
440 0 : task_mem(m, mm);
441 0 : task_core_dumping(m, task);
442 0 : task_thp_status(m, mm);
443 0 : mmput(mm);
444 : }
445 0 : task_sig(m, task);
446 0 : task_cap(m, task);
447 0 : task_seccomp(m, task);
448 0 : task_cpus_allowed(m, task);
449 0 : cpuset_task_status_allowed(m, task);
450 0 : task_context_switch_counts(m, task);
451 0 : return 0;
452 : }
453 :
454 0 : static int do_task_stat(struct seq_file *m, struct pid_namespace *ns,
455 : struct pid *pid, struct task_struct *task, int whole)
456 : {
457 0 : unsigned long vsize, eip, esp, wchan = 0;
458 : int priority, nice;
459 0 : int tty_pgrp = -1, tty_nr = 0;
460 : sigset_t sigign, sigcatch;
461 : char state;
462 0 : pid_t ppid = 0, pgid = -1, sid = -1;
463 0 : int num_threads = 0;
464 : int permitted;
465 : struct mm_struct *mm;
466 : unsigned long long start_time;
467 0 : unsigned long cmin_flt = 0, cmaj_flt = 0;
468 0 : unsigned long min_flt = 0, maj_flt = 0;
469 : u64 cutime, cstime, utime, stime;
470 : u64 cgtime, gtime;
471 0 : unsigned long rsslim = 0;
472 : unsigned long flags;
473 0 : int exit_code = task->exit_code;
474 :
475 0 : state = *get_task_state(task);
476 0 : vsize = eip = esp = 0;
477 0 : permitted = ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS | PTRACE_MODE_NOAUDIT);
478 0 : mm = get_task_mm(task);
479 0 : if (mm) {
480 0 : vsize = task_vsize(mm);
481 : /*
482 : * esp and eip are intentionally zeroed out. There is no
483 : * non-racy way to read them without freezing the task.
484 : * Programs that need reliable values can use ptrace(2).
485 : *
486 : * The only exception is if the task is core dumping because
487 : * a program is not able to use ptrace(2) in that case. It is
488 : * safe because the task has stopped executing permanently.
489 : */
490 0 : if (permitted && (task->flags & (PF_EXITING|PF_DUMPCORE))) {
491 0 : if (try_get_task_stack(task)) {
492 0 : eip = KSTK_EIP(task);
493 0 : esp = KSTK_ESP(task);
494 0 : put_task_stack(task);
495 : }
496 : }
497 : }
498 :
499 0 : sigemptyset(&sigign);
500 0 : sigemptyset(&sigcatch);
501 0 : cutime = cstime = utime = stime = 0;
502 0 : cgtime = gtime = 0;
503 :
504 0 : if (lock_task_sighand(task, &flags)) {
505 0 : struct signal_struct *sig = task->signal;
506 :
507 0 : if (sig->tty) {
508 0 : struct pid *pgrp = tty_get_pgrp(sig->tty);
509 0 : tty_pgrp = pid_nr_ns(pgrp, ns);
510 0 : put_pid(pgrp);
511 0 : tty_nr = new_encode_dev(tty_devnum(sig->tty));
512 : }
513 :
514 0 : num_threads = get_nr_threads(task);
515 0 : collect_sigign_sigcatch(task, &sigign, &sigcatch);
516 :
517 0 : cmin_flt = sig->cmin_flt;
518 0 : cmaj_flt = sig->cmaj_flt;
519 0 : cutime = sig->cutime;
520 0 : cstime = sig->cstime;
521 0 : cgtime = sig->cgtime;
522 0 : rsslim = READ_ONCE(sig->rlim[RLIMIT_RSS].rlim_cur);
523 :
524 : /* add up live thread stats at the group level */
525 0 : if (whole) {
526 : struct task_struct *t = task;
527 : do {
528 0 : min_flt += t->min_flt;
529 0 : maj_flt += t->maj_flt;
530 0 : gtime += task_gtime(t);
531 0 : } while_each_thread(task, t);
532 :
533 0 : min_flt += sig->min_flt;
534 0 : maj_flt += sig->maj_flt;
535 0 : thread_group_cputime_adjusted(task, &utime, &stime);
536 0 : gtime += sig->gtime;
537 :
538 0 : if (sig->flags & (SIGNAL_GROUP_EXIT | SIGNAL_STOP_STOPPED))
539 0 : exit_code = sig->group_exit_code;
540 : }
541 :
542 0 : sid = task_session_nr_ns(task, ns);
543 0 : ppid = task_tgid_nr_ns(task->real_parent, ns);
544 0 : pgid = task_pgrp_nr_ns(task, ns);
545 :
546 0 : unlock_task_sighand(task, &flags);
547 : }
548 :
549 0 : if (permitted && (!whole || num_threads < 2))
550 0 : wchan = !task_is_running(task);
551 0 : if (!whole) {
552 0 : min_flt = task->min_flt;
553 0 : maj_flt = task->maj_flt;
554 0 : task_cputime_adjusted(task, &utime, &stime);
555 0 : gtime = task_gtime(task);
556 : }
557 :
558 : /* scale priority and nice values from timeslices to -20..20 */
559 : /* to make it look like a "normal" Unix priority/nice value */
560 0 : priority = task_prio(task);
561 0 : nice = task_nice(task);
562 :
563 : /* apply timens offset for boottime and convert nsec -> ticks */
564 0 : start_time =
565 0 : nsec_to_clock_t(timens_add_boottime_ns(task->start_boottime));
566 :
567 0 : seq_put_decimal_ull(m, "", pid_nr_ns(pid, ns));
568 0 : seq_puts(m, " (");
569 0 : proc_task_name(m, task, false);
570 0 : seq_puts(m, ") ");
571 0 : seq_putc(m, state);
572 0 : seq_put_decimal_ll(m, " ", ppid);
573 0 : seq_put_decimal_ll(m, " ", pgid);
574 0 : seq_put_decimal_ll(m, " ", sid);
575 0 : seq_put_decimal_ll(m, " ", tty_nr);
576 0 : seq_put_decimal_ll(m, " ", tty_pgrp);
577 0 : seq_put_decimal_ull(m, " ", task->flags);
578 0 : seq_put_decimal_ull(m, " ", min_flt);
579 0 : seq_put_decimal_ull(m, " ", cmin_flt);
580 0 : seq_put_decimal_ull(m, " ", maj_flt);
581 0 : seq_put_decimal_ull(m, " ", cmaj_flt);
582 0 : seq_put_decimal_ull(m, " ", nsec_to_clock_t(utime));
583 0 : seq_put_decimal_ull(m, " ", nsec_to_clock_t(stime));
584 0 : seq_put_decimal_ll(m, " ", nsec_to_clock_t(cutime));
585 0 : seq_put_decimal_ll(m, " ", nsec_to_clock_t(cstime));
586 0 : seq_put_decimal_ll(m, " ", priority);
587 0 : seq_put_decimal_ll(m, " ", nice);
588 0 : seq_put_decimal_ll(m, " ", num_threads);
589 0 : seq_put_decimal_ull(m, " ", 0);
590 0 : seq_put_decimal_ull(m, " ", start_time);
591 0 : seq_put_decimal_ull(m, " ", vsize);
592 0 : seq_put_decimal_ull(m, " ", mm ? get_mm_rss(mm) : 0);
593 0 : seq_put_decimal_ull(m, " ", rsslim);
594 0 : seq_put_decimal_ull(m, " ", mm ? (permitted ? mm->start_code : 1) : 0);
595 0 : seq_put_decimal_ull(m, " ", mm ? (permitted ? mm->end_code : 1) : 0);
596 0 : seq_put_decimal_ull(m, " ", (permitted && mm) ? mm->start_stack : 0);
597 0 : seq_put_decimal_ull(m, " ", esp);
598 0 : seq_put_decimal_ull(m, " ", eip);
599 : /* The signal information here is obsolete.
600 : * It must be decimal for Linux 2.0 compatibility.
601 : * Use /proc/#/status for real-time signals.
602 : */
603 0 : seq_put_decimal_ull(m, " ", task->pending.signal.sig[0] & 0x7fffffffUL);
604 0 : seq_put_decimal_ull(m, " ", task->blocked.sig[0] & 0x7fffffffUL);
605 0 : seq_put_decimal_ull(m, " ", sigign.sig[0] & 0x7fffffffUL);
606 0 : seq_put_decimal_ull(m, " ", sigcatch.sig[0] & 0x7fffffffUL);
607 :
608 : /*
609 : * We used to output the absolute kernel address, but that's an
610 : * information leak - so instead we show a 0/1 flag here, to signal
611 : * to user-space whether there's a wchan field in /proc/PID/wchan.
612 : *
613 : * This works with older implementations of procps as well.
614 : */
615 0 : seq_put_decimal_ull(m, " ", wchan);
616 :
617 0 : seq_put_decimal_ull(m, " ", 0);
618 0 : seq_put_decimal_ull(m, " ", 0);
619 0 : seq_put_decimal_ll(m, " ", task->exit_signal);
620 0 : seq_put_decimal_ll(m, " ", task_cpu(task));
621 0 : seq_put_decimal_ull(m, " ", task->rt_priority);
622 0 : seq_put_decimal_ull(m, " ", task->policy);
623 0 : seq_put_decimal_ull(m, " ", delayacct_blkio_ticks(task));
624 0 : seq_put_decimal_ull(m, " ", nsec_to_clock_t(gtime));
625 0 : seq_put_decimal_ll(m, " ", nsec_to_clock_t(cgtime));
626 :
627 0 : if (mm && permitted) {
628 0 : seq_put_decimal_ull(m, " ", mm->start_data);
629 0 : seq_put_decimal_ull(m, " ", mm->end_data);
630 0 : seq_put_decimal_ull(m, " ", mm->start_brk);
631 0 : seq_put_decimal_ull(m, " ", mm->arg_start);
632 0 : seq_put_decimal_ull(m, " ", mm->arg_end);
633 0 : seq_put_decimal_ull(m, " ", mm->env_start);
634 0 : seq_put_decimal_ull(m, " ", mm->env_end);
635 : } else
636 0 : seq_puts(m, " 0 0 0 0 0 0 0");
637 :
638 0 : if (permitted)
639 0 : seq_put_decimal_ll(m, " ", exit_code);
640 : else
641 0 : seq_puts(m, " 0");
642 :
643 0 : seq_putc(m, '\n');
644 0 : if (mm)
645 0 : mmput(mm);
646 0 : return 0;
647 : }
648 :
649 0 : int proc_tid_stat(struct seq_file *m, struct pid_namespace *ns,
650 : struct pid *pid, struct task_struct *task)
651 : {
652 0 : return do_task_stat(m, ns, pid, task, 0);
653 : }
654 :
655 0 : int proc_tgid_stat(struct seq_file *m, struct pid_namespace *ns,
656 : struct pid *pid, struct task_struct *task)
657 : {
658 0 : return do_task_stat(m, ns, pid, task, 1);
659 : }
660 :
661 0 : int proc_pid_statm(struct seq_file *m, struct pid_namespace *ns,
662 : struct pid *pid, struct task_struct *task)
663 : {
664 0 : struct mm_struct *mm = get_task_mm(task);
665 :
666 0 : if (mm) {
667 : unsigned long size;
668 0 : unsigned long resident = 0;
669 0 : unsigned long shared = 0;
670 0 : unsigned long text = 0;
671 0 : unsigned long data = 0;
672 :
673 0 : size = task_statm(mm, &shared, &text, &data, &resident);
674 0 : mmput(mm);
675 :
676 : /*
677 : * For quick read, open code by putting numbers directly
678 : * expected format is
679 : * seq_printf(m, "%lu %lu %lu %lu 0 %lu 0\n",
680 : * size, resident, shared, text, data);
681 : */
682 0 : seq_put_decimal_ull(m, "", size);
683 0 : seq_put_decimal_ull(m, " ", resident);
684 0 : seq_put_decimal_ull(m, " ", shared);
685 0 : seq_put_decimal_ull(m, " ", text);
686 0 : seq_put_decimal_ull(m, " ", 0);
687 0 : seq_put_decimal_ull(m, " ", data);
688 0 : seq_put_decimal_ull(m, " ", 0);
689 0 : seq_putc(m, '\n');
690 : } else {
691 0 : seq_write(m, "0 0 0 0 0 0 0\n", 14);
692 : }
693 0 : return 0;
694 : }
695 :
696 : #ifdef CONFIG_PROC_CHILDREN
697 : static struct pid *
698 : get_children_pid(struct inode *inode, struct pid *pid_prev, loff_t pos)
699 : {
700 : struct task_struct *start, *task;
701 : struct pid *pid = NULL;
702 :
703 : read_lock(&tasklist_lock);
704 :
705 : start = pid_task(proc_pid(inode), PIDTYPE_PID);
706 : if (!start)
707 : goto out;
708 :
709 : /*
710 : * Lets try to continue searching first, this gives
711 : * us significant speedup on children-rich processes.
712 : */
713 : if (pid_prev) {
714 : task = pid_task(pid_prev, PIDTYPE_PID);
715 : if (task && task->real_parent == start &&
716 : !(list_empty(&task->sibling))) {
717 : if (list_is_last(&task->sibling, &start->children))
718 : goto out;
719 : task = list_first_entry(&task->sibling,
720 : struct task_struct, sibling);
721 : pid = get_pid(task_pid(task));
722 : goto out;
723 : }
724 : }
725 :
726 : /*
727 : * Slow search case.
728 : *
729 : * We might miss some children here if children
730 : * are exited while we were not holding the lock,
731 : * but it was never promised to be accurate that
732 : * much.
733 : *
734 : * "Just suppose that the parent sleeps, but N children
735 : * exit after we printed their tids. Now the slow paths
736 : * skips N extra children, we miss N tasks." (c)
737 : *
738 : * So one need to stop or freeze the leader and all
739 : * its children to get a precise result.
740 : */
741 : list_for_each_entry(task, &start->children, sibling) {
742 : if (pos-- == 0) {
743 : pid = get_pid(task_pid(task));
744 : break;
745 : }
746 : }
747 :
748 : out:
749 : read_unlock(&tasklist_lock);
750 : return pid;
751 : }
752 :
753 : static int children_seq_show(struct seq_file *seq, void *v)
754 : {
755 : struct inode *inode = file_inode(seq->file);
756 :
757 : seq_printf(seq, "%d ", pid_nr_ns(v, proc_pid_ns(inode->i_sb)));
758 : return 0;
759 : }
760 :
761 : static void *children_seq_start(struct seq_file *seq, loff_t *pos)
762 : {
763 : return get_children_pid(file_inode(seq->file), NULL, *pos);
764 : }
765 :
766 : static void *children_seq_next(struct seq_file *seq, void *v, loff_t *pos)
767 : {
768 : struct pid *pid;
769 :
770 : pid = get_children_pid(file_inode(seq->file), v, *pos + 1);
771 : put_pid(v);
772 :
773 : ++*pos;
774 : return pid;
775 : }
776 :
777 : static void children_seq_stop(struct seq_file *seq, void *v)
778 : {
779 : put_pid(v);
780 : }
781 :
782 : static const struct seq_operations children_seq_ops = {
783 : .start = children_seq_start,
784 : .next = children_seq_next,
785 : .stop = children_seq_stop,
786 : .show = children_seq_show,
787 : };
788 :
789 : static int children_seq_open(struct inode *inode, struct file *file)
790 : {
791 : return seq_open(file, &children_seq_ops);
792 : }
793 :
794 : const struct file_operations proc_tid_children_operations = {
795 : .open = children_seq_open,
796 : .read = seq_read,
797 : .llseek = seq_lseek,
798 : .release = seq_release,
799 : };
800 : #endif /* CONFIG_PROC_CHILDREN */
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