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 : #include <linux/mmu_context.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 : /*
104 : * Test before PF_KTHREAD because all workqueue worker threads are
105 : * kernel threads.
106 : */
107 0 : if (p->flags & PF_WQ_WORKER)
108 0 : wq_worker_comm(tcomm, sizeof(tcomm), p);
109 0 : else if (p->flags & PF_KTHREAD)
110 0 : get_kthread_comm(tcomm, sizeof(tcomm), p);
111 : else
112 0 : __get_task_comm(tcomm, sizeof(tcomm), p);
113 :
114 0 : if (escape)
115 : seq_escape_str(m, tcomm, ESCAPE_SPACE | ESCAPE_SPECIAL, "\n\\");
116 : else
117 0 : seq_printf(m, "%.64s", tcomm);
118 0 : }
119 :
120 : /*
121 : * The task state array is a strange "bitmap" of
122 : * reasons to sleep. Thus "running" is zero, and
123 : * you can test for combinations of others with
124 : * simple bit tests.
125 : */
126 : static const char * const task_state_array[] = {
127 :
128 : /* states in TASK_REPORT: */
129 : "R (running)", /* 0x00 */
130 : "S (sleeping)", /* 0x01 */
131 : "D (disk sleep)", /* 0x02 */
132 : "T (stopped)", /* 0x04 */
133 : "t (tracing stop)", /* 0x08 */
134 : "X (dead)", /* 0x10 */
135 : "Z (zombie)", /* 0x20 */
136 : "P (parked)", /* 0x40 */
137 :
138 : /* states beyond TASK_REPORT: */
139 : "I (idle)", /* 0x80 */
140 : };
141 :
142 : static inline const char *get_task_state(struct task_struct *tsk)
143 : {
144 : BUILD_BUG_ON(1 + ilog2(TASK_REPORT_MAX) != ARRAY_SIZE(task_state_array));
145 0 : return task_state_array[task_state_index(tsk)];
146 : }
147 :
148 0 : static inline void task_state(struct seq_file *m, struct pid_namespace *ns,
149 : struct pid *pid, struct task_struct *p)
150 : {
151 0 : struct user_namespace *user_ns = seq_user_ns(m);
152 : struct group_info *group_info;
153 0 : int g, umask = -1;
154 : struct task_struct *tracer;
155 : const struct cred *cred;
156 0 : pid_t ppid, tpid = 0, tgid, ngid;
157 0 : unsigned int max_fds = 0;
158 :
159 : rcu_read_lock();
160 0 : ppid = pid_alive(p) ?
161 0 : task_tgid_nr_ns(rcu_dereference(p->real_parent), ns) : 0;
162 :
163 0 : tracer = ptrace_parent(p);
164 0 : if (tracer)
165 0 : tpid = task_pid_nr_ns(tracer, ns);
166 :
167 0 : tgid = task_tgid_nr_ns(p, ns);
168 0 : ngid = task_numa_group_id(p);
169 0 : cred = get_task_cred(p);
170 :
171 0 : task_lock(p);
172 0 : if (p->fs)
173 0 : umask = p->fs->umask;
174 0 : if (p->files)
175 0 : max_fds = files_fdtable(p->files)->max_fds;
176 0 : task_unlock(p);
177 : rcu_read_unlock();
178 :
179 0 : if (umask >= 0)
180 0 : seq_printf(m, "Umask:\t%#04o\n", umask);
181 0 : seq_puts(m, "State:\t");
182 0 : seq_puts(m, get_task_state(p));
183 :
184 0 : seq_put_decimal_ull(m, "\nTgid:\t", tgid);
185 0 : seq_put_decimal_ull(m, "\nNgid:\t", ngid);
186 0 : seq_put_decimal_ull(m, "\nPid:\t", pid_nr_ns(pid, ns));
187 0 : seq_put_decimal_ull(m, "\nPPid:\t", ppid);
188 0 : seq_put_decimal_ull(m, "\nTracerPid:\t", tpid);
189 0 : seq_put_decimal_ull(m, "\nUid:\t", from_kuid_munged(user_ns, cred->uid));
190 0 : seq_put_decimal_ull(m, "\t", from_kuid_munged(user_ns, cred->euid));
191 0 : seq_put_decimal_ull(m, "\t", from_kuid_munged(user_ns, cred->suid));
192 0 : seq_put_decimal_ull(m, "\t", from_kuid_munged(user_ns, cred->fsuid));
193 0 : seq_put_decimal_ull(m, "\nGid:\t", from_kgid_munged(user_ns, cred->gid));
194 0 : seq_put_decimal_ull(m, "\t", from_kgid_munged(user_ns, cred->egid));
195 0 : seq_put_decimal_ull(m, "\t", from_kgid_munged(user_ns, cred->sgid));
196 0 : seq_put_decimal_ull(m, "\t", from_kgid_munged(user_ns, cred->fsgid));
197 0 : seq_put_decimal_ull(m, "\nFDSize:\t", max_fds);
198 :
199 0 : seq_puts(m, "\nGroups:\t");
200 0 : group_info = cred->group_info;
201 0 : for (g = 0; g < group_info->ngroups; g++)
202 0 : seq_put_decimal_ull(m, g ? " " : "",
203 0 : from_kgid_munged(user_ns, group_info->gid[g]));
204 0 : put_cred(cred);
205 : /* Trailing space shouldn't have been added in the first place. */
206 0 : seq_putc(m, ' ');
207 :
208 : #ifdef CONFIG_PID_NS
209 0 : seq_puts(m, "\nNStgid:");
210 0 : for (g = ns->level; g <= pid->level; g++)
211 0 : seq_put_decimal_ull(m, "\t", task_tgid_nr_ns(p, pid->numbers[g].ns));
212 0 : seq_puts(m, "\nNSpid:");
213 0 : for (g = ns->level; g <= pid->level; g++)
214 0 : seq_put_decimal_ull(m, "\t", task_pid_nr_ns(p, pid->numbers[g].ns));
215 0 : seq_puts(m, "\nNSpgid:");
216 0 : for (g = ns->level; g <= pid->level; g++)
217 0 : seq_put_decimal_ull(m, "\t", task_pgrp_nr_ns(p, pid->numbers[g].ns));
218 0 : seq_puts(m, "\nNSsid:");
219 0 : for (g = ns->level; g <= pid->level; g++)
220 0 : seq_put_decimal_ull(m, "\t", task_session_nr_ns(p, pid->numbers[g].ns));
221 : #endif
222 0 : seq_putc(m, '\n');
223 :
224 0 : seq_printf(m, "Kthread:\t%c\n", p->flags & PF_KTHREAD ? '1' : '0');
225 0 : }
226 :
227 0 : void render_sigset_t(struct seq_file *m, const char *header,
228 : sigset_t *set)
229 : {
230 : int i;
231 :
232 0 : seq_puts(m, header);
233 :
234 0 : i = _NSIG;
235 : do {
236 0 : int x = 0;
237 :
238 0 : i -= 4;
239 0 : if (sigismember(set, i+1)) x |= 1;
240 0 : if (sigismember(set, i+2)) x |= 2;
241 0 : if (sigismember(set, i+3)) x |= 4;
242 0 : if (sigismember(set, i+4)) x |= 8;
243 0 : seq_putc(m, hex_asc[x]);
244 0 : } while (i >= 4);
245 :
246 0 : seq_putc(m, '\n');
247 0 : }
248 :
249 : static void collect_sigign_sigcatch(struct task_struct *p, sigset_t *sigign,
250 : sigset_t *sigcatch)
251 : {
252 : struct k_sigaction *k;
253 : int i;
254 :
255 0 : k = p->sighand->action;
256 0 : for (i = 1; i <= _NSIG; ++i, ++k) {
257 0 : if (k->sa.sa_handler == SIG_IGN)
258 : sigaddset(sigign, i);
259 0 : else if (k->sa.sa_handler != SIG_DFL)
260 : sigaddset(sigcatch, i);
261 : }
262 : }
263 :
264 0 : static inline void task_sig(struct seq_file *m, struct task_struct *p)
265 : {
266 : unsigned long flags;
267 : sigset_t pending, shpending, blocked, ignored, caught;
268 0 : int num_threads = 0;
269 0 : unsigned int qsize = 0;
270 0 : unsigned long qlim = 0;
271 :
272 0 : sigemptyset(&pending);
273 0 : sigemptyset(&shpending);
274 0 : sigemptyset(&blocked);
275 0 : sigemptyset(&ignored);
276 0 : sigemptyset(&caught);
277 :
278 0 : if (lock_task_sighand(p, &flags)) {
279 0 : pending = p->pending.signal;
280 0 : shpending = p->signal->shared_pending.signal;
281 0 : blocked = p->blocked;
282 0 : collect_sigign_sigcatch(p, &ignored, &caught);
283 0 : num_threads = get_nr_threads(p);
284 : rcu_read_lock(); /* FIXME: is this correct? */
285 0 : qsize = get_rlimit_value(task_ucounts(p), UCOUNT_RLIMIT_SIGPENDING);
286 : rcu_read_unlock();
287 0 : qlim = task_rlimit(p, RLIMIT_SIGPENDING);
288 0 : unlock_task_sighand(p, &flags);
289 : }
290 :
291 0 : seq_put_decimal_ull(m, "Threads:\t", num_threads);
292 0 : seq_put_decimal_ull(m, "\nSigQ:\t", qsize);
293 0 : seq_put_decimal_ull(m, "/", qlim);
294 :
295 : /* render them all */
296 0 : render_sigset_t(m, "\nSigPnd:\t", &pending);
297 0 : render_sigset_t(m, "ShdPnd:\t", &shpending);
298 0 : render_sigset_t(m, "SigBlk:\t", &blocked);
299 0 : render_sigset_t(m, "SigIgn:\t", &ignored);
300 0 : render_sigset_t(m, "SigCgt:\t", &caught);
301 0 : }
302 :
303 0 : static void render_cap_t(struct seq_file *m, const char *header,
304 : kernel_cap_t *a)
305 : {
306 0 : seq_puts(m, header);
307 0 : seq_put_hex_ll(m, NULL, a->val, 16);
308 0 : seq_putc(m, '\n');
309 0 : }
310 :
311 0 : static inline void task_cap(struct seq_file *m, struct task_struct *p)
312 : {
313 : const struct cred *cred;
314 : kernel_cap_t cap_inheritable, cap_permitted, cap_effective,
315 : cap_bset, cap_ambient;
316 :
317 : rcu_read_lock();
318 0 : cred = __task_cred(p);
319 0 : cap_inheritable = cred->cap_inheritable;
320 0 : cap_permitted = cred->cap_permitted;
321 0 : cap_effective = cred->cap_effective;
322 0 : cap_bset = cred->cap_bset;
323 0 : cap_ambient = cred->cap_ambient;
324 : rcu_read_unlock();
325 :
326 0 : render_cap_t(m, "CapInh:\t", &cap_inheritable);
327 0 : render_cap_t(m, "CapPrm:\t", &cap_permitted);
328 0 : render_cap_t(m, "CapEff:\t", &cap_effective);
329 0 : render_cap_t(m, "CapBnd:\t", &cap_bset);
330 0 : render_cap_t(m, "CapAmb:\t", &cap_ambient);
331 0 : }
332 :
333 0 : static inline void task_seccomp(struct seq_file *m, struct task_struct *p)
334 : {
335 0 : seq_put_decimal_ull(m, "NoNewPrivs:\t", task_no_new_privs(p));
336 : #ifdef CONFIG_SECCOMP
337 0 : seq_put_decimal_ull(m, "\nSeccomp:\t", p->seccomp.mode);
338 : #ifdef CONFIG_SECCOMP_FILTER
339 : seq_put_decimal_ull(m, "\nSeccomp_filters:\t",
340 : atomic_read(&p->seccomp.filter_count));
341 : #endif
342 : #endif
343 0 : seq_puts(m, "\nSpeculation_Store_Bypass:\t");
344 0 : switch (arch_prctl_spec_ctrl_get(p, PR_SPEC_STORE_BYPASS)) {
345 : case -EINVAL:
346 0 : seq_puts(m, "unknown");
347 0 : break;
348 : case PR_SPEC_NOT_AFFECTED:
349 0 : seq_puts(m, "not vulnerable");
350 0 : break;
351 : case PR_SPEC_PRCTL | PR_SPEC_FORCE_DISABLE:
352 0 : seq_puts(m, "thread force mitigated");
353 0 : break;
354 : case PR_SPEC_PRCTL | PR_SPEC_DISABLE:
355 0 : seq_puts(m, "thread mitigated");
356 0 : break;
357 : case PR_SPEC_PRCTL | PR_SPEC_ENABLE:
358 0 : seq_puts(m, "thread vulnerable");
359 0 : break;
360 : case PR_SPEC_DISABLE:
361 0 : seq_puts(m, "globally mitigated");
362 0 : break;
363 : default:
364 0 : seq_puts(m, "vulnerable");
365 0 : break;
366 : }
367 :
368 0 : seq_puts(m, "\nSpeculationIndirectBranch:\t");
369 0 : switch (arch_prctl_spec_ctrl_get(p, PR_SPEC_INDIRECT_BRANCH)) {
370 : case -EINVAL:
371 0 : seq_puts(m, "unsupported");
372 0 : break;
373 : case PR_SPEC_NOT_AFFECTED:
374 0 : seq_puts(m, "not affected");
375 0 : break;
376 : case PR_SPEC_PRCTL | PR_SPEC_FORCE_DISABLE:
377 0 : seq_puts(m, "conditional force disabled");
378 0 : break;
379 : case PR_SPEC_PRCTL | PR_SPEC_DISABLE:
380 0 : seq_puts(m, "conditional disabled");
381 0 : break;
382 : case PR_SPEC_PRCTL | PR_SPEC_ENABLE:
383 0 : seq_puts(m, "conditional enabled");
384 0 : break;
385 : case PR_SPEC_ENABLE:
386 0 : seq_puts(m, "always enabled");
387 0 : break;
388 : case PR_SPEC_DISABLE:
389 0 : seq_puts(m, "always disabled");
390 0 : break;
391 : default:
392 0 : seq_puts(m, "unknown");
393 0 : break;
394 : }
395 0 : seq_putc(m, '\n');
396 0 : }
397 :
398 0 : static inline void task_context_switch_counts(struct seq_file *m,
399 : struct task_struct *p)
400 : {
401 0 : seq_put_decimal_ull(m, "voluntary_ctxt_switches:\t", p->nvcsw);
402 0 : seq_put_decimal_ull(m, "\nnonvoluntary_ctxt_switches:\t", p->nivcsw);
403 0 : seq_putc(m, '\n');
404 0 : }
405 :
406 0 : static void task_cpus_allowed(struct seq_file *m, struct task_struct *task)
407 : {
408 0 : seq_printf(m, "Cpus_allowed:\t%*pb\n",
409 0 : cpumask_pr_args(&task->cpus_mask));
410 0 : seq_printf(m, "Cpus_allowed_list:\t%*pbl\n",
411 : cpumask_pr_args(&task->cpus_mask));
412 0 : }
413 :
414 0 : static inline void task_core_dumping(struct seq_file *m, struct task_struct *task)
415 : {
416 0 : seq_put_decimal_ull(m, "CoreDumping:\t", !!task->signal->core_state);
417 0 : seq_putc(m, '\n');
418 0 : }
419 :
420 : static inline void task_thp_status(struct seq_file *m, struct mm_struct *mm)
421 : {
422 0 : bool thp_enabled = IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE);
423 :
424 : if (thp_enabled)
425 : thp_enabled = !test_bit(MMF_DISABLE_THP, &mm->flags);
426 0 : seq_printf(m, "THP_enabled:\t%d\n", thp_enabled);
427 : }
428 :
429 : static inline void task_untag_mask(struct seq_file *m, struct mm_struct *mm)
430 : {
431 0 : seq_printf(m, "untag_mask:\t%#lx\n", mm_untag_mask(mm));
432 : }
433 :
434 0 : int proc_pid_status(struct seq_file *m, struct pid_namespace *ns,
435 : struct pid *pid, struct task_struct *task)
436 : {
437 0 : struct mm_struct *mm = get_task_mm(task);
438 :
439 0 : seq_puts(m, "Name:\t");
440 0 : proc_task_name(m, task, true);
441 0 : seq_putc(m, '\n');
442 :
443 0 : task_state(m, ns, pid, task);
444 :
445 0 : if (mm) {
446 0 : task_mem(m, mm);
447 0 : task_core_dumping(m, task);
448 0 : task_thp_status(m, mm);
449 0 : task_untag_mask(m, mm);
450 0 : mmput(mm);
451 : }
452 0 : task_sig(m, task);
453 0 : task_cap(m, task);
454 0 : task_seccomp(m, task);
455 0 : task_cpus_allowed(m, task);
456 0 : cpuset_task_status_allowed(m, task);
457 0 : task_context_switch_counts(m, task);
458 0 : return 0;
459 : }
460 :
461 0 : static int do_task_stat(struct seq_file *m, struct pid_namespace *ns,
462 : struct pid *pid, struct task_struct *task, int whole)
463 : {
464 0 : unsigned long vsize, eip, esp, wchan = 0;
465 : int priority, nice;
466 0 : int tty_pgrp = -1, tty_nr = 0;
467 : sigset_t sigign, sigcatch;
468 : char state;
469 0 : pid_t ppid = 0, pgid = -1, sid = -1;
470 0 : int num_threads = 0;
471 : int permitted;
472 : struct mm_struct *mm;
473 : unsigned long long start_time;
474 0 : unsigned long cmin_flt = 0, cmaj_flt = 0;
475 0 : unsigned long min_flt = 0, maj_flt = 0;
476 : u64 cutime, cstime, utime, stime;
477 : u64 cgtime, gtime;
478 0 : unsigned long rsslim = 0;
479 : unsigned long flags;
480 0 : int exit_code = task->exit_code;
481 :
482 0 : state = *get_task_state(task);
483 0 : vsize = eip = esp = 0;
484 0 : permitted = ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS | PTRACE_MODE_NOAUDIT);
485 0 : mm = get_task_mm(task);
486 0 : if (mm) {
487 0 : vsize = task_vsize(mm);
488 : /*
489 : * esp and eip are intentionally zeroed out. There is no
490 : * non-racy way to read them without freezing the task.
491 : * Programs that need reliable values can use ptrace(2).
492 : *
493 : * The only exception is if the task is core dumping because
494 : * a program is not able to use ptrace(2) in that case. It is
495 : * safe because the task has stopped executing permanently.
496 : */
497 0 : if (permitted && (task->flags & (PF_EXITING|PF_DUMPCORE))) {
498 0 : if (try_get_task_stack(task)) {
499 0 : eip = KSTK_EIP(task);
500 0 : esp = KSTK_ESP(task);
501 0 : put_task_stack(task);
502 : }
503 : }
504 : }
505 :
506 0 : sigemptyset(&sigign);
507 0 : sigemptyset(&sigcatch);
508 0 : cutime = cstime = utime = stime = 0;
509 0 : cgtime = gtime = 0;
510 :
511 0 : if (lock_task_sighand(task, &flags)) {
512 0 : struct signal_struct *sig = task->signal;
513 :
514 0 : if (sig->tty) {
515 0 : struct pid *pgrp = tty_get_pgrp(sig->tty);
516 0 : tty_pgrp = pid_nr_ns(pgrp, ns);
517 0 : put_pid(pgrp);
518 0 : tty_nr = new_encode_dev(tty_devnum(sig->tty));
519 : }
520 :
521 0 : num_threads = get_nr_threads(task);
522 0 : collect_sigign_sigcatch(task, &sigign, &sigcatch);
523 :
524 0 : cmin_flt = sig->cmin_flt;
525 0 : cmaj_flt = sig->cmaj_flt;
526 0 : cutime = sig->cutime;
527 0 : cstime = sig->cstime;
528 0 : cgtime = sig->cgtime;
529 0 : rsslim = READ_ONCE(sig->rlim[RLIMIT_RSS].rlim_cur);
530 :
531 : /* add up live thread stats at the group level */
532 0 : if (whole) {
533 : struct task_struct *t = task;
534 : do {
535 0 : min_flt += t->min_flt;
536 0 : maj_flt += t->maj_flt;
537 0 : gtime += task_gtime(t);
538 0 : } while_each_thread(task, t);
539 :
540 0 : min_flt += sig->min_flt;
541 0 : maj_flt += sig->maj_flt;
542 0 : thread_group_cputime_adjusted(task, &utime, &stime);
543 0 : gtime += sig->gtime;
544 :
545 0 : if (sig->flags & (SIGNAL_GROUP_EXIT | SIGNAL_STOP_STOPPED))
546 0 : exit_code = sig->group_exit_code;
547 : }
548 :
549 0 : sid = task_session_nr_ns(task, ns);
550 0 : ppid = task_tgid_nr_ns(task->real_parent, ns);
551 0 : pgid = task_pgrp_nr_ns(task, ns);
552 :
553 0 : unlock_task_sighand(task, &flags);
554 : }
555 :
556 0 : if (permitted && (!whole || num_threads < 2))
557 0 : wchan = !task_is_running(task);
558 0 : if (!whole) {
559 0 : min_flt = task->min_flt;
560 0 : maj_flt = task->maj_flt;
561 0 : task_cputime_adjusted(task, &utime, &stime);
562 0 : gtime = task_gtime(task);
563 : }
564 :
565 : /* scale priority and nice values from timeslices to -20..20 */
566 : /* to make it look like a "normal" Unix priority/nice value */
567 0 : priority = task_prio(task);
568 0 : nice = task_nice(task);
569 :
570 : /* apply timens offset for boottime and convert nsec -> ticks */
571 0 : start_time =
572 0 : nsec_to_clock_t(timens_add_boottime_ns(task->start_boottime));
573 :
574 0 : seq_put_decimal_ull(m, "", pid_nr_ns(pid, ns));
575 0 : seq_puts(m, " (");
576 0 : proc_task_name(m, task, false);
577 0 : seq_puts(m, ") ");
578 0 : seq_putc(m, state);
579 0 : seq_put_decimal_ll(m, " ", ppid);
580 0 : seq_put_decimal_ll(m, " ", pgid);
581 0 : seq_put_decimal_ll(m, " ", sid);
582 0 : seq_put_decimal_ll(m, " ", tty_nr);
583 0 : seq_put_decimal_ll(m, " ", tty_pgrp);
584 0 : seq_put_decimal_ull(m, " ", task->flags);
585 0 : seq_put_decimal_ull(m, " ", min_flt);
586 0 : seq_put_decimal_ull(m, " ", cmin_flt);
587 0 : seq_put_decimal_ull(m, " ", maj_flt);
588 0 : seq_put_decimal_ull(m, " ", cmaj_flt);
589 0 : seq_put_decimal_ull(m, " ", nsec_to_clock_t(utime));
590 0 : seq_put_decimal_ull(m, " ", nsec_to_clock_t(stime));
591 0 : seq_put_decimal_ll(m, " ", nsec_to_clock_t(cutime));
592 0 : seq_put_decimal_ll(m, " ", nsec_to_clock_t(cstime));
593 0 : seq_put_decimal_ll(m, " ", priority);
594 0 : seq_put_decimal_ll(m, " ", nice);
595 0 : seq_put_decimal_ll(m, " ", num_threads);
596 0 : seq_put_decimal_ull(m, " ", 0);
597 0 : seq_put_decimal_ull(m, " ", start_time);
598 0 : seq_put_decimal_ull(m, " ", vsize);
599 0 : seq_put_decimal_ull(m, " ", mm ? get_mm_rss(mm) : 0);
600 0 : seq_put_decimal_ull(m, " ", rsslim);
601 0 : seq_put_decimal_ull(m, " ", mm ? (permitted ? mm->start_code : 1) : 0);
602 0 : seq_put_decimal_ull(m, " ", mm ? (permitted ? mm->end_code : 1) : 0);
603 0 : seq_put_decimal_ull(m, " ", (permitted && mm) ? mm->start_stack : 0);
604 0 : seq_put_decimal_ull(m, " ", esp);
605 0 : seq_put_decimal_ull(m, " ", eip);
606 : /* The signal information here is obsolete.
607 : * It must be decimal for Linux 2.0 compatibility.
608 : * Use /proc/#/status for real-time signals.
609 : */
610 0 : seq_put_decimal_ull(m, " ", task->pending.signal.sig[0] & 0x7fffffffUL);
611 0 : seq_put_decimal_ull(m, " ", task->blocked.sig[0] & 0x7fffffffUL);
612 0 : seq_put_decimal_ull(m, " ", sigign.sig[0] & 0x7fffffffUL);
613 0 : seq_put_decimal_ull(m, " ", sigcatch.sig[0] & 0x7fffffffUL);
614 :
615 : /*
616 : * We used to output the absolute kernel address, but that's an
617 : * information leak - so instead we show a 0/1 flag here, to signal
618 : * to user-space whether there's a wchan field in /proc/PID/wchan.
619 : *
620 : * This works with older implementations of procps as well.
621 : */
622 0 : seq_put_decimal_ull(m, " ", wchan);
623 :
624 0 : seq_put_decimal_ull(m, " ", 0);
625 0 : seq_put_decimal_ull(m, " ", 0);
626 0 : seq_put_decimal_ll(m, " ", task->exit_signal);
627 0 : seq_put_decimal_ll(m, " ", task_cpu(task));
628 0 : seq_put_decimal_ull(m, " ", task->rt_priority);
629 0 : seq_put_decimal_ull(m, " ", task->policy);
630 0 : seq_put_decimal_ull(m, " ", delayacct_blkio_ticks(task));
631 0 : seq_put_decimal_ull(m, " ", nsec_to_clock_t(gtime));
632 0 : seq_put_decimal_ll(m, " ", nsec_to_clock_t(cgtime));
633 :
634 0 : if (mm && permitted) {
635 0 : seq_put_decimal_ull(m, " ", mm->start_data);
636 0 : seq_put_decimal_ull(m, " ", mm->end_data);
637 0 : seq_put_decimal_ull(m, " ", mm->start_brk);
638 0 : seq_put_decimal_ull(m, " ", mm->arg_start);
639 0 : seq_put_decimal_ull(m, " ", mm->arg_end);
640 0 : seq_put_decimal_ull(m, " ", mm->env_start);
641 0 : seq_put_decimal_ull(m, " ", mm->env_end);
642 : } else
643 0 : seq_puts(m, " 0 0 0 0 0 0 0");
644 :
645 0 : if (permitted)
646 0 : seq_put_decimal_ll(m, " ", exit_code);
647 : else
648 0 : seq_puts(m, " 0");
649 :
650 0 : seq_putc(m, '\n');
651 0 : if (mm)
652 0 : mmput(mm);
653 0 : return 0;
654 : }
655 :
656 0 : int proc_tid_stat(struct seq_file *m, struct pid_namespace *ns,
657 : struct pid *pid, struct task_struct *task)
658 : {
659 0 : return do_task_stat(m, ns, pid, task, 0);
660 : }
661 :
662 0 : int proc_tgid_stat(struct seq_file *m, struct pid_namespace *ns,
663 : struct pid *pid, struct task_struct *task)
664 : {
665 0 : return do_task_stat(m, ns, pid, task, 1);
666 : }
667 :
668 0 : int proc_pid_statm(struct seq_file *m, struct pid_namespace *ns,
669 : struct pid *pid, struct task_struct *task)
670 : {
671 0 : struct mm_struct *mm = get_task_mm(task);
672 :
673 0 : if (mm) {
674 : unsigned long size;
675 0 : unsigned long resident = 0;
676 0 : unsigned long shared = 0;
677 0 : unsigned long text = 0;
678 0 : unsigned long data = 0;
679 :
680 0 : size = task_statm(mm, &shared, &text, &data, &resident);
681 0 : mmput(mm);
682 :
683 : /*
684 : * For quick read, open code by putting numbers directly
685 : * expected format is
686 : * seq_printf(m, "%lu %lu %lu %lu 0 %lu 0\n",
687 : * size, resident, shared, text, data);
688 : */
689 0 : seq_put_decimal_ull(m, "", size);
690 0 : seq_put_decimal_ull(m, " ", resident);
691 0 : seq_put_decimal_ull(m, " ", shared);
692 0 : seq_put_decimal_ull(m, " ", text);
693 0 : seq_put_decimal_ull(m, " ", 0);
694 0 : seq_put_decimal_ull(m, " ", data);
695 0 : seq_put_decimal_ull(m, " ", 0);
696 0 : seq_putc(m, '\n');
697 : } else {
698 0 : seq_write(m, "0 0 0 0 0 0 0\n", 14);
699 : }
700 0 : return 0;
701 : }
702 :
703 : #ifdef CONFIG_PROC_CHILDREN
704 : static struct pid *
705 : get_children_pid(struct inode *inode, struct pid *pid_prev, loff_t pos)
706 : {
707 : struct task_struct *start, *task;
708 : struct pid *pid = NULL;
709 :
710 : read_lock(&tasklist_lock);
711 :
712 : start = pid_task(proc_pid(inode), PIDTYPE_PID);
713 : if (!start)
714 : goto out;
715 :
716 : /*
717 : * Lets try to continue searching first, this gives
718 : * us significant speedup on children-rich processes.
719 : */
720 : if (pid_prev) {
721 : task = pid_task(pid_prev, PIDTYPE_PID);
722 : if (task && task->real_parent == start &&
723 : !(list_empty(&task->sibling))) {
724 : if (list_is_last(&task->sibling, &start->children))
725 : goto out;
726 : task = list_first_entry(&task->sibling,
727 : struct task_struct, sibling);
728 : pid = get_pid(task_pid(task));
729 : goto out;
730 : }
731 : }
732 :
733 : /*
734 : * Slow search case.
735 : *
736 : * We might miss some children here if children
737 : * are exited while we were not holding the lock,
738 : * but it was never promised to be accurate that
739 : * much.
740 : *
741 : * "Just suppose that the parent sleeps, but N children
742 : * exit after we printed their tids. Now the slow paths
743 : * skips N extra children, we miss N tasks." (c)
744 : *
745 : * So one need to stop or freeze the leader and all
746 : * its children to get a precise result.
747 : */
748 : list_for_each_entry(task, &start->children, sibling) {
749 : if (pos-- == 0) {
750 : pid = get_pid(task_pid(task));
751 : break;
752 : }
753 : }
754 :
755 : out:
756 : read_unlock(&tasklist_lock);
757 : return pid;
758 : }
759 :
760 : static int children_seq_show(struct seq_file *seq, void *v)
761 : {
762 : struct inode *inode = file_inode(seq->file);
763 :
764 : seq_printf(seq, "%d ", pid_nr_ns(v, proc_pid_ns(inode->i_sb)));
765 : return 0;
766 : }
767 :
768 : static void *children_seq_start(struct seq_file *seq, loff_t *pos)
769 : {
770 : return get_children_pid(file_inode(seq->file), NULL, *pos);
771 : }
772 :
773 : static void *children_seq_next(struct seq_file *seq, void *v, loff_t *pos)
774 : {
775 : struct pid *pid;
776 :
777 : pid = get_children_pid(file_inode(seq->file), v, *pos + 1);
778 : put_pid(v);
779 :
780 : ++*pos;
781 : return pid;
782 : }
783 :
784 : static void children_seq_stop(struct seq_file *seq, void *v)
785 : {
786 : put_pid(v);
787 : }
788 :
789 : static const struct seq_operations children_seq_ops = {
790 : .start = children_seq_start,
791 : .next = children_seq_next,
792 : .stop = children_seq_stop,
793 : .show = children_seq_show,
794 : };
795 :
796 : static int children_seq_open(struct inode *inode, struct file *file)
797 : {
798 : return seq_open(file, &children_seq_ops);
799 : }
800 :
801 : const struct file_operations proc_tid_children_operations = {
802 : .open = children_seq_open,
803 : .read = seq_read,
804 : .llseek = seq_lseek,
805 : .release = seq_release,
806 : };
807 : #endif /* CONFIG_PROC_CHILDREN */
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