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proc, oom_adj: extract oom_score_adj setting into a helper
[deliverable/linux.git] / fs / proc / base.c
CommitLineData
1da177e4
LT		 1/*
2 * linux/fs/proc/base.c
3 *
4 * Copyright (C) 1991, 1992 Linus Torvalds
5 *
6 * proc base directory handling functions
7 *
8 * 1999, Al Viro. Rewritten. Now it covers the whole per-process part.
9 * Instead of using magical inumbers to determine the kind of object
10 * we allocate and fill in-core inodes upon lookup. They don't even
11 * go into icache. We cache the reference to task_struct upon lookup too.
12 * Eventually it should become a filesystem in its own. We don't use the
13 * rest of procfs anymore.
e070ad49
ML		 14 *
15 *
16 * Changelog:
17 * 17-Jan-2005
18 * Allan Bezerra
19 * Bruna Moreira <bruna.moreira@indt.org.br>
20 * Edjard Mota <edjard.mota@indt.org.br>
21 * Ilias Biris <ilias.biris@indt.org.br>
22 * Mauricio Lin <mauricio.lin@indt.org.br>
23 *
24 * Embedded Linux Lab - 10LE Instituto Nokia de Tecnologia - INdT
25 *
26 * A new process specific entry (smaps) included in /proc. It shows the
27 * size of rss for each memory area. The maps entry lacks information
28 * about physical memory size (rss) for each mapped file, i.e.,
29 * rss information for executables and library files.
30 * This additional information is useful for any tools that need to know
31 * about physical memory consumption for a process specific library.
32 *
33 * Changelog:
34 * 21-Feb-2005
35 * Embedded Linux Lab - 10LE Instituto Nokia de Tecnologia - INdT
36 * Pud inclusion in the page table walking.
37 *
38 * ChangeLog:
39 * 10-Mar-2005
40 * 10LE Instituto Nokia de Tecnologia - INdT:
41 * A better way to walks through the page table as suggested by Hugh Dickins.
42 *
43 * Simo Piiroinen <simo.piiroinen@nokia.com>:
44 * Smaps information related to shared, private, clean and dirty pages.
45 *
46 * Paul Mundt <paul.mundt@nokia.com>:
47 * Overall revision about smaps.
1da177e4
LT		 48 */
49
50#include <asm/uaccess.h>
51
1da177e4
LT		 52#include <linux/errno.h>
53#include <linux/time.h>
54#include <linux/proc_fs.h>
55#include <linux/stat.h>
5995477a 56#include <linux/task_io_accounting_ops.h>
1da177e4 57#include <linux/init.h>
16f7e0fe 58#include <linux/capability.h>
1da177e4 59#include <linux/file.h>
9f3acc31 60#include <linux/fdtable.h>
1da177e4
LT		 61#include <linux/string.h>
62#include <linux/seq_file.h>
63#include <linux/namei.h>
6b3286ed 64#include <linux/mnt_namespace.h>
1da177e4 65#include <linux/mm.h>
a63d83f4 66#include <linux/swap.h>
b835996f 67#include <linux/rcupdate.h>
1da177e4 68#include <linux/kallsyms.h>
2ec220e2 69#include <linux/stacktrace.h>
d85f50d5 70#include <linux/resource.h>
5096add8 71#include <linux/module.h>
1da177e4
LT		 72#include <linux/mount.h>
73#include <linux/security.h>
74#include <linux/ptrace.h>
0d094efe 75#include <linux/tracehook.h>
87ebdc00 76#include <linux/printk.h>
a424316c 77#include <linux/cgroup.h>
1da177e4
LT		 78#include <linux/cpuset.h>
79#include <linux/audit.h>
5addc5dd 80#include <linux/poll.h>
1651e14e 81#include <linux/nsproxy.h>
8ac773b4 82#include <linux/oom.h>
3cb4a0bb 83#include <linux/elf.h>
60347f67 84#include <linux/pid_namespace.h>
22d917d8 85#include <linux/user_namespace.h>
5ad4e53b 86#include <linux/fs_struct.h>
5a0e3ad6 87#include <linux/slab.h>
640708a2 88#include <linux/flex_array.h>
48f6a7a5 89#include <linux/posix-timers.h>
f133ecca
CM		 90#ifdef CONFIG_HARDWALL
91#include <asm/hardwall.h>
92#endif
43d2b113 93#include <trace/events/oom.h>
1da177e4 94#include "internal.h"
faf60af1 95#include "fd.h"
1da177e4 96
0f2fe20f
EB		 97/* NOTE:
98 * Implementing inode permission operations in /proc is almost
99 * certainly an error. Permission checks need to happen during
100 * each system call not at open time. The reason is that most of
101 * what we wish to check for permissions in /proc varies at runtime.
102 *
103 * The classic example of a problem is opening file descriptors
104 * in /proc for a task before it execs a suid executable.
105 */
106
1da177e4 107struct pid_entry {
cedbccab 108 const char *name;
c5141e6d 109 int len;
d161a13f 110 umode_t mode;
c5ef1c42 111 const struct inode_operations *iop;
00977a59 112 const struct file_operations *fop;
20cdc894 113 union proc_op op;
1da177e4
LT		 114};
115
61a28784 116#define NOD(NAME, MODE, IOP, FOP, OP) { \
20cdc894 117 .name = (NAME), \
c5141e6d 118 .len = sizeof(NAME) - 1, \
20cdc894
EB		 119 .mode = MODE, \
120 .iop = IOP, \
121 .fop = FOP, \
122 .op = OP, \
123}
124
631f9c18
AD		 125#define DIR(NAME, MODE, iops, fops) \
126 NOD(NAME, (S_IFDIR|(MODE)), &iops, &fops, {} )
127#define LNK(NAME, get_link) \
61a28784 128 NOD(NAME, (S_IFLNK|S_IRWXUGO), \
20cdc894 129 &proc_pid_link_inode_operations, NULL, \
631f9c18
AD		 130 { .proc_get_link = get_link } )
131#define REG(NAME, MODE, fops) \
132 NOD(NAME, (S_IFREG|(MODE)), NULL, &fops, {})
631f9c18 133#define ONE(NAME, MODE, show) \
be614086
EB		 134 NOD(NAME, (S_IFREG|(MODE)), \
135 NULL, &proc_single_file_operations, \
631f9c18 136 { .proc_show = show } )
1da177e4 137
aed54175
VN		 138/*
139 * Count the number of hardlinks for the pid_entry table, excluding the .
140 * and .. links.
141 */
142static unsigned int pid_entry_count_dirs(const struct pid_entry *entries,
143 unsigned int n)
144{
145 unsigned int i;
146 unsigned int count;
147
148 count = 0;
149 for (i = 0; i < n; ++i) {
150 if (S_ISDIR(entries[i].mode))
151 ++count;
152 }
153
154 return count;
155}
156
f7ad3c6b 157static int get_task_root(struct task_struct *task, struct path *root)
1da177e4 158{
7c2c7d99
HD		 159 int result = -ENOENT;
160
0494f6ec 161 task_lock(task);
f7ad3c6b
MS		 162 if (task->fs) {
163 get_fs_root(task->fs, root);
7c2c7d99
HD		 164 result = 0;
165 }
0494f6ec 166 task_unlock(task);
7c2c7d99 167 return result;
0494f6ec
MS		 168}
169
7773fbc5 170static int proc_cwd_link(struct dentry *dentry, struct path *path)
0494f6ec 171{
2b0143b5 172 struct task_struct *task = get_proc_task(d_inode(dentry));
0494f6ec 173 int result = -ENOENT;
99f89551
EB		 174
175 if (task) {
f7ad3c6b
MS		 176 task_lock(task);
177 if (task->fs) {
178 get_fs_pwd(task->fs, path);
179 result = 0;
180 }
181 task_unlock(task);
99f89551
EB		 182 put_task_struct(task);
183 }
1da177e4
LT		 184 return result;
185}
186
7773fbc5 187static int proc_root_link(struct dentry *dentry, struct path *path)
1da177e4 188{
2b0143b5 189 struct task_struct *task = get_proc_task(d_inode(dentry));
1da177e4 190 int result = -ENOENT;
99f89551
EB		 191
192 if (task) {
f7ad3c6b 193 result = get_task_root(task, path);
99f89551
EB		 194 put_task_struct(task);
195 }
1da177e4
LT		 196 return result;
197}
198
c2c0bb44
AD		 199static ssize_t proc_pid_cmdline_read(struct file *file, char __user *buf,
200 size_t _count, loff_t *pos)
1da177e4 201{
c2c0bb44
AD		 202 struct task_struct *tsk;
203 struct mm_struct *mm;
204 char *page;
205 unsigned long count = _count;
206 unsigned long arg_start, arg_end, env_start, env_end;
207 unsigned long len1, len2, len;
208 unsigned long p;
209 char c;
210 ssize_t rv;
211
212 BUG_ON(*pos < 0);
213
214 tsk = get_proc_task(file_inode(file));
215 if (!tsk)
216 return -ESRCH;
217 mm = get_task_mm(tsk);
218 put_task_struct(tsk);
219 if (!mm)
220 return 0;
221 /* Check if process spawned far enough to have cmdline. */
222 if (!mm->env_end) {
223 rv = 0;
224 goto out_mmput;
225 }
226
227 page = (char *)__get_free_page(GFP_TEMPORARY);
228 if (!page) {
229 rv = -ENOMEM;
230 goto out_mmput;
231 }
232
233 down_read(&mm->mmap_sem);
234 arg_start = mm->arg_start;
235 arg_end = mm->arg_end;
236 env_start = mm->env_start;
237 env_end = mm->env_end;
238 up_read(&mm->mmap_sem);
239
240 BUG_ON(arg_start > arg_end);
241 BUG_ON(env_start > env_end);
242
243 len1 = arg_end - arg_start;
244 len2 = env_end - env_start;
245
3581d458
AD		 246 /* Empty ARGV. */
247 if (len1 == 0) {
248 rv = 0;
249 goto out_free_page;
250 }
2ca66ff7 251 /*
c2c0bb44
AD		 252 * Inherently racy -- command line shares address space
253 * with code and data.
2ca66ff7 254 */
c2c0bb44
AD		 255 rv = access_remote_vm(mm, arg_end - 1, &c, 1, 0);
256 if (rv <= 0)
257 goto out_free_page;
258
259 rv = 0;
260
261 if (c == '\0') {
262 /* Command line (set of strings) occupies whole ARGV. */
263 if (len1 <= *pos)
264 goto out_free_page;
265
266 p = arg_start + *pos;
267 len = len1 - *pos;
268 while (count > 0 && len > 0) {
269 unsigned int _count;
270 int nr_read;
271
272 _count = min3(count, len, PAGE_SIZE);
273 nr_read = access_remote_vm(mm, p, page, _count, 0);
274 if (nr_read < 0)
275 rv = nr_read;
276 if (nr_read <= 0)
277 goto out_free_page;
278
279 if (copy_to_user(buf, page, nr_read)) {
280 rv = -EFAULT;
281 goto out_free_page;
282 }
283
284 p += nr_read;
285 len -= nr_read;
286 buf += nr_read;
287 count -= nr_read;
288 rv += nr_read;
289 }
290 } else {
291 /*
292 * Command line (1 string) occupies ARGV and maybe
293 * extends into ENVP.
294 */
295 if (len1 + len2 <= *pos)
296 goto skip_argv_envp;
297 if (len1 <= *pos)
298 goto skip_argv;
299
300 p = arg_start + *pos;
301 len = len1 - *pos;
302 while (count > 0 && len > 0) {
303 unsigned int _count, l;
304 int nr_read;
305 bool final;
306
307 _count = min3(count, len, PAGE_SIZE);
308 nr_read = access_remote_vm(mm, p, page, _count, 0);
309 if (nr_read < 0)
310 rv = nr_read;
311 if (nr_read <= 0)
312 goto out_free_page;
313
314 /*
315 * Command line can be shorter than whole ARGV
316 * even if last "marker" byte says it is not.
317 */
318 final = false;
319 l = strnlen(page, nr_read);
320 if (l < nr_read) {
321 nr_read = l;
322 final = true;
323 }
324
325 if (copy_to_user(buf, page, nr_read)) {
326 rv = -EFAULT;
327 goto out_free_page;
328 }
329
330 p += nr_read;
331 len -= nr_read;
332 buf += nr_read;
333 count -= nr_read;
334 rv += nr_read;
335
336 if (final)
337 goto out_free_page;
338 }
339skip_argv:
340 /*
341 * Command line (1 string) occupies ARGV and
342 * extends into ENVP.
343 */
344 if (len1 <= *pos) {
345 p = env_start + *pos - len1;
346 len = len1 + len2 - *pos;
347 } else {
348 p = env_start;
349 len = len2;
350 }
351 while (count > 0 && len > 0) {
352 unsigned int _count, l;
353 int nr_read;
354 bool final;
355
356 _count = min3(count, len, PAGE_SIZE);
357 nr_read = access_remote_vm(mm, p, page, _count, 0);
358 if (nr_read < 0)
359 rv = nr_read;
360 if (nr_read <= 0)
361 goto out_free_page;
362
363 /* Find EOS. */
364 final = false;
365 l = strnlen(page, nr_read);
366 if (l < nr_read) {
367 nr_read = l;
368 final = true;
369 }
370
371 if (copy_to_user(buf, page, nr_read)) {
372 rv = -EFAULT;
373 goto out_free_page;
374 }
375
376 p += nr_read;
377 len -= nr_read;
378 buf += nr_read;
379 count -= nr_read;
380 rv += nr_read;
381
382 if (final)
383 goto out_free_page;
384 }
385skip_argv_envp:
386 ;
387 }
388
389out_free_page:
390 free_page((unsigned long)page);
391out_mmput:
392 mmput(mm);
393 if (rv > 0)
394 *pos += rv;
395 return rv;
1da177e4
LT		 396}
397
c2c0bb44
AD		 398static const struct file_operations proc_pid_cmdline_ops = {
399 .read = proc_pid_cmdline_read,
400 .llseek = generic_file_llseek,
401};
402
f9ea536e
AD		 403static int proc_pid_auxv(struct seq_file *m, struct pid_namespace *ns,
404 struct pid *pid, struct task_struct *task)
1da177e4 405{
caaee623 406 struct mm_struct *mm = mm_access(task, PTRACE_MODE_READ_FSCREDS);
2fadaef4 407 if (mm && !IS_ERR(mm)) {
1da177e4 408 unsigned int nwords = 0;
dfe6b7d9 409 do {
1da177e4 410 nwords += 2;
dfe6b7d9 411 } while (mm->saved_auxv[nwords - 2] != 0); /* AT_NULL */
f9ea536e 412 seq_write(m, mm->saved_auxv, nwords * sizeof(mm->saved_auxv[0]));
1da177e4 413 mmput(mm);
f9ea536e
AD		 414 return 0;
415 } else
416 return PTR_ERR(mm);
1da177e4
LT		 417}
418
419
420#ifdef CONFIG_KALLSYMS
421/*
422 * Provides a wchan file via kallsyms in a proper one-value-per-file format.
423 * Returns the resolved symbol. If that fails, simply return the address.
424 */
edfcd606
AD		 425static int proc_pid_wchan(struct seq_file *m, struct pid_namespace *ns,
426 struct pid *pid, struct task_struct *task)
1da177e4 427{
ffb45122 428 unsigned long wchan;
9281acea 429 char symname[KSYM_NAME_LEN];
1da177e4
LT		 430
431 wchan = get_wchan(task);
432
caaee623
JH		 433 if (wchan && ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS)
434 && !lookup_symbol_name(wchan, symname))
25ce3191 435 seq_printf(m, "%s", symname);
b2f73922 436 else
1e92a61c 437 seq_putc(m, '0');
25ce3191
JP		 438
439 return 0;
1da177e4
LT		 440}
441#endif /* CONFIG_KALLSYMS */
442
a9712bc1
AV		 443static int lock_trace(struct task_struct *task)
444{
445 int err = mutex_lock_killable(&task->signal->cred_guard_mutex);
446 if (err)
447 return err;
caaee623 448 if (!ptrace_may_access(task, PTRACE_MODE_ATTACH_FSCREDS)) {
a9712bc1
AV		 449 mutex_unlock(&task->signal->cred_guard_mutex);
450 return -EPERM;
451 }
452 return 0;
453}
454
455static void unlock_trace(struct task_struct *task)
456{
457 mutex_unlock(&task->signal->cred_guard_mutex);
458}
459
2ec220e2
KC		 460#ifdef CONFIG_STACKTRACE
461
462#define MAX_STACK_TRACE_DEPTH 64
463
464static int proc_pid_stack(struct seq_file *m, struct pid_namespace *ns,
465 struct pid *pid, struct task_struct *task)
466{
467 struct stack_trace trace;
468 unsigned long *entries;
a9712bc1 469 int err;
2ec220e2
KC		 470 int i;
471
472 entries = kmalloc(MAX_STACK_TRACE_DEPTH * sizeof(*entries), GFP_KERNEL);
473 if (!entries)
474 return -ENOMEM;
475
476 trace.nr_entries = 0;
477 trace.max_entries = MAX_STACK_TRACE_DEPTH;
478 trace.entries = entries;
479 trace.skip = 0;
2ec220e2 480
a9712bc1
AV		 481 err = lock_trace(task);
482 if (!err) {
483 save_stack_trace_tsk(task, &trace);
484
485 for (i = 0; i < trace.nr_entries; i++) {
b81a618d 486 seq_printf(m, "[<%pK>] %pS\n",
a9712bc1
AV		 487 (void *)entries[i], (void *)entries[i]);
488 }
489 unlock_trace(task);
2ec220e2
KC		 490 }
491 kfree(entries);
492
a9712bc1 493 return err;
2ec220e2
KC		 494}
495#endif
496
5968cece 497#ifdef CONFIG_SCHED_INFO
1da177e4
LT		 498/*
499 * Provides /proc/PID/schedstat
500 */
f6e826ca
AD		 501static int proc_pid_schedstat(struct seq_file *m, struct pid_namespace *ns,
502 struct pid *pid, struct task_struct *task)
1da177e4 503{
5968cece
NR		 504 if (unlikely(!sched_info_on()))
505 seq_printf(m, "0 0 0\n");
506 else
507 seq_printf(m, "%llu %llu %lu\n",
25ce3191
JP		 508 (unsigned long long)task->se.sum_exec_runtime,
509 (unsigned long long)task->sched_info.run_delay,
510 task->sched_info.pcount);
511
512 return 0;
1da177e4
LT		 513}
514#endif
515
9745512c
AV		 516#ifdef CONFIG_LATENCYTOP
517static int lstats_show_proc(struct seq_file *m, void *v)
518{
519 int i;
13d77c37
HS		 520 struct inode *inode = m->private;
521 struct task_struct *task = get_proc_task(inode);
9745512c 522
13d77c37
HS		 523 if (!task)
524 return -ESRCH;
525 seq_puts(m, "Latency Top version : v0.1\n");
9745512c 526 for (i = 0; i < 32; i++) {
34e49d4f
JP		 527 struct latency_record *lr = &task->latency_record[i];
528 if (lr->backtrace[0]) {
9745512c 529 int q;
34e49d4f
JP		 530 seq_printf(m, "%i %li %li",
531 lr->count, lr->time, lr->max);
9745512c 532 for (q = 0; q < LT_BACKTRACEDEPTH; q++) {
34e49d4f
JP		 533 unsigned long bt = lr->backtrace[q];
534 if (!bt)
9745512c 535 break;
34e49d4f 536 if (bt == ULONG_MAX)
9745512c 537 break;
34e49d4f 538 seq_printf(m, " %ps", (void *)bt);
9745512c 539 }
9d6de12f 540 seq_putc(m, '\n');
9745512c
AV		 541 }
542
543 }
13d77c37 544 put_task_struct(task);
9745512c
AV		 545 return 0;
546}
547
548static int lstats_open(struct inode *inode, struct file *file)
549{
13d77c37 550 return single_open(file, lstats_show_proc, inode);
d6643d12
HS		 551}
552
9745512c
AV		 553static ssize_t lstats_write(struct file *file, const char __user *buf,
554 size_t count, loff_t *offs)
555{
496ad9aa 556 struct task_struct *task = get_proc_task(file_inode(file));
9745512c 557
13d77c37
HS		 558 if (!task)
559 return -ESRCH;
9745512c 560 clear_all_latency_tracing(task);
13d77c37 561 put_task_struct(task);
9745512c
AV		 562
563 return count;
564}
565
566static const struct file_operations proc_lstats_operations = {
567 .open = lstats_open,
568 .read = seq_read,
569 .write = lstats_write,
570 .llseek = seq_lseek,
13d77c37 571 .release = single_release,
9745512c
AV		 572};
573
574#endif
575
6ba51e37
AD		 576static int proc_oom_score(struct seq_file *m, struct pid_namespace *ns,
577 struct pid *pid, struct task_struct *task)
1da177e4 578{
a7f638f9 579 unsigned long totalpages = totalram_pages + total_swap_pages;
b95c35e7 580 unsigned long points = 0;
1da177e4 581
19c5d45a 582 read_lock(&tasklist_lock);
b95c35e7 583 if (pid_alive(task))
a7f638f9
DR		 584 points = oom_badness(task, NULL, NULL, totalpages) *
585 1000 / totalpages;
19c5d45a 586 read_unlock(&tasklist_lock);
25ce3191
JP		 587 seq_printf(m, "%lu\n", points);
588
589 return 0;
1da177e4
LT		 590}
591
d85f50d5 592struct limit_names {
cedbccab
AD		 593 const char *name;
594 const char *unit;
d85f50d5
NH		 595};
596
597static const struct limit_names lnames[RLIM_NLIMITS] = {
cff4edb5 598 [RLIMIT_CPU] = {"Max cpu time", "seconds"},
d85f50d5
NH		 599 [RLIMIT_FSIZE] = {"Max file size", "bytes"},
600 [RLIMIT_DATA] = {"Max data size", "bytes"},
601 [RLIMIT_STACK] = {"Max stack size", "bytes"},
602 [RLIMIT_CORE] = {"Max core file size", "bytes"},
603 [RLIMIT_RSS] = {"Max resident set", "bytes"},
604 [RLIMIT_NPROC] = {"Max processes", "processes"},
605 [RLIMIT_NOFILE] = {"Max open files", "files"},
606 [RLIMIT_MEMLOCK] = {"Max locked memory", "bytes"},
607 [RLIMIT_AS] = {"Max address space", "bytes"},
608 [RLIMIT_LOCKS] = {"Max file locks", "locks"},
609 [RLIMIT_SIGPENDING] = {"Max pending signals", "signals"},
610 [RLIMIT_MSGQUEUE] = {"Max msgqueue size", "bytes"},
611 [RLIMIT_NICE] = {"Max nice priority", NULL},
612 [RLIMIT_RTPRIO] = {"Max realtime priority", NULL},
8808117c 613 [RLIMIT_RTTIME] = {"Max realtime timeout", "us"},
d85f50d5
NH		 614};
615
616/* Display limits for a process */
1c963eb1
AD		 617static int proc_pid_limits(struct seq_file *m, struct pid_namespace *ns,
618 struct pid *pid, struct task_struct *task)
d85f50d5
NH		 619{
620 unsigned int i;
d85f50d5 621 unsigned long flags;
d85f50d5
NH		 622
623 struct rlimit rlim[RLIM_NLIMITS];
624
a6bebbc8 625 if (!lock_task_sighand(task, &flags))
d85f50d5 626 return 0;
d85f50d5
NH		 627 memcpy(rlim, task->signal->rlim, sizeof(struct rlimit) * RLIM_NLIMITS);
628 unlock_task_sighand(task, &flags);
d85f50d5
NH		 629
630 /*
631 * print the file header
632 */
1c963eb1 633 seq_printf(m, "%-25s %-20s %-20s %-10s\n",
25ce3191 634 "Limit", "Soft Limit", "Hard Limit", "Units");
d85f50d5
NH		 635
636 for (i = 0; i < RLIM_NLIMITS; i++) {
637 if (rlim[i].rlim_cur == RLIM_INFINITY)
1c963eb1 638 seq_printf(m, "%-25s %-20s ",
25ce3191 639 lnames[i].name, "unlimited");
d85f50d5 640 else
1c963eb1 641 seq_printf(m, "%-25s %-20lu ",
25ce3191 642 lnames[i].name, rlim[i].rlim_cur);
d85f50d5
NH		 643
644 if (rlim[i].rlim_max == RLIM_INFINITY)
1c963eb1 645 seq_printf(m, "%-20s ", "unlimited");
d85f50d5 646 else
1c963eb1 647 seq_printf(m, "%-20lu ", rlim[i].rlim_max);
d85f50d5
NH		 648
649 if (lnames[i].unit)
1c963eb1 650 seq_printf(m, "%-10s\n", lnames[i].unit);
d85f50d5 651 else
1c963eb1 652 seq_putc(m, '\n');
d85f50d5
NH		 653 }
654
1c963eb1 655 return 0;
d85f50d5
NH		 656}
657
ebcb6734 658#ifdef CONFIG_HAVE_ARCH_TRACEHOOK
09d93bd6
AD		 659static int proc_pid_syscall(struct seq_file *m, struct pid_namespace *ns,
660 struct pid *pid, struct task_struct *task)
ebcb6734
RM		 661{
662 long nr;
663 unsigned long args[6], sp, pc;
25ce3191
JP		 664 int res;
665
666 res = lock_trace(task);
a9712bc1
AV		 667 if (res)
668 return res;
ebcb6734
RM		 669
670 if (task_current_syscall(task, &nr, args, 6, &sp, &pc))
09d93bd6 671 seq_puts(m, "running\n");
a9712bc1 672 else if (nr < 0)
09d93bd6 673 seq_printf(m, "%ld 0x%lx 0x%lx\n", nr, sp, pc);
a9712bc1 674 else
09d93bd6 675 seq_printf(m,
ebcb6734
RM		 676 "%ld 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx\n",
677 nr,
678 args[0], args[1], args[2], args[3], args[4], args[5],
679 sp, pc);
a9712bc1 680 unlock_trace(task);
25ce3191
JP		 681
682 return 0;
ebcb6734
RM		 683}
684#endif /* CONFIG_HAVE_ARCH_TRACEHOOK */
685
1da177e4
LT		 686/************************************************************************/
687/* Here the fs part begins */
688/************************************************************************/
689
690/* permission checks */
778c1144 691static int proc_fd_access_allowed(struct inode *inode)
1da177e4 692{
778c1144
EB		 693 struct task_struct *task;
694 int allowed = 0;
df26c40e
EB		 695 /* Allow access to a task's file descriptors if it is us or we
696 * may use ptrace attach to the process and find out that
697 * information.
778c1144
EB		 698 */
699 task = get_proc_task(inode);
df26c40e 700 if (task) {
caaee623 701 allowed = ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS);
778c1144 702 put_task_struct(task);
df26c40e 703 }
778c1144 704 return allowed;
1da177e4
LT		 705}
706
6b4e306a 707int proc_setattr(struct dentry *dentry, struct iattr *attr)
6d76fa58
LT		 708{
709 int error;
2b0143b5 710 struct inode *inode = d_inode(dentry);
6d76fa58
LT		 711
712 if (attr->ia_valid & ATTR_MODE)
713 return -EPERM;
714
715 error = inode_change_ok(inode, attr);
1025774c
CH		 716 if (error)
717 return error;
718
1025774c
CH		 719 setattr_copy(inode, attr);
720 mark_inode_dirty(inode);
721 return 0;
6d76fa58
LT		 722}
723
0499680a
VK		 724/*
725 * May current process learn task's sched/cmdline info (for hide_pid_min=1)
726 * or euid/egid (for hide_pid_min=2)?
727 */
728static bool has_pid_permissions(struct pid_namespace *pid,
729 struct task_struct *task,
730 int hide_pid_min)
731{
732 if (pid->hide_pid < hide_pid_min)
733 return true;
734 if (in_group_p(pid->pid_gid))
735 return true;
caaee623 736 return ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS);
0499680a
VK		 737}
738
739
740static int proc_pid_permission(struct inode *inode, int mask)
741{
742 struct pid_namespace *pid = inode->i_sb->s_fs_info;
743 struct task_struct *task;
744 bool has_perms;
745
746 task = get_proc_task(inode);
a2ef990a
XF		 747 if (!task)
748 return -ESRCH;
0499680a
VK		 749 has_perms = has_pid_permissions(pid, task, 1);
750 put_task_struct(task);
751
752 if (!has_perms) {
753 if (pid->hide_pid == 2) {
754 /*
755 * Let's make getdents(), stat(), and open()
756 * consistent with each other. If a process
757 * may not stat() a file, it shouldn't be seen
758 * in procfs at all.
759 */
760 return -ENOENT;
761 }
762
763 return -EPERM;
764 }
765 return generic_permission(inode, mask);
766}
767
768
769
c5ef1c42 770static const struct inode_operations proc_def_inode_operations = {
6d76fa58
LT		 771 .setattr = proc_setattr,
772};
773
be614086
EB		 774static int proc_single_show(struct seq_file *m, void *v)
775{
776 struct inode *inode = m->private;
777 struct pid_namespace *ns;
778 struct pid *pid;
779 struct task_struct *task;
780 int ret;
781
782 ns = inode->i_sb->s_fs_info;
783 pid = proc_pid(inode);
784 task = get_pid_task(pid, PIDTYPE_PID);
785 if (!task)
786 return -ESRCH;
787
788 ret = PROC_I(inode)->op.proc_show(m, ns, pid, task);
789
790 put_task_struct(task);
791 return ret;
792}
793
794static int proc_single_open(struct inode *inode, struct file *filp)
795{
c6a34058 796 return single_open(filp, proc_single_show, inode);
be614086
EB		 797}
798
799static const struct file_operations proc_single_file_operations = {
800 .open = proc_single_open,
801 .read = seq_read,
802 .llseek = seq_lseek,
803 .release = single_release,
804};
805
5381e169
ON		 806
807struct mm_struct *proc_mem_open(struct inode *inode, unsigned int mode)
1da177e4 808{
5381e169
ON		 809 struct task_struct *task = get_proc_task(inode);
810 struct mm_struct *mm = ERR_PTR(-ESRCH);
e268337d 811
5381e169 812 if (task) {
caaee623 813 mm = mm_access(task, mode | PTRACE_MODE_FSCREDS);
5381e169 814 put_task_struct(task);
e268337d 815
5381e169
ON		 816 if (!IS_ERR_OR_NULL(mm)) {
817 /* ensure this mm_struct can't be freed */
818 atomic_inc(&mm->mm_count);
819 /* but do not pin its memory */
820 mmput(mm);
821 }
822 }
823
824 return mm;
825}
826
827static int __mem_open(struct inode *inode, struct file *file, unsigned int mode)
828{
829 struct mm_struct *mm = proc_mem_open(inode, mode);
e268337d
LT		 830
831 if (IS_ERR(mm))
832 return PTR_ERR(mm);
833
e268337d 834 file->private_data = mm;
1da177e4
LT		 835 return 0;
836}
837
b409e578
CW		 838static int mem_open(struct inode *inode, struct file *file)
839{
bc452b4b
DH		 840 int ret = __mem_open(inode, file, PTRACE_MODE_ATTACH);
841
842 /* OK to pass negative loff_t, we can catch out-of-range */
843 file->f_mode |= FMODE_UNSIGNED_OFFSET;
844
845 return ret;
b409e578
CW		 846}
847
572d34b9
ON		 848static ssize_t mem_rw(struct file *file, char __user *buf,
849 size_t count, loff_t *ppos, int write)
1da177e4 850{
e268337d 851 struct mm_struct *mm = file->private_data;
572d34b9
ON		 852 unsigned long addr = *ppos;
853 ssize_t copied;
1da177e4 854 char *page;
1da177e4 855
e268337d
LT		 856 if (!mm)
857 return 0;
99f89551 858
30cd8903
KM		 859 page = (char *)__get_free_page(GFP_TEMPORARY);
860 if (!page)
e268337d 861 return -ENOMEM;
1da177e4 862
f7ca54f4 863 copied = 0;
6d08f2c7
ON		 864 if (!atomic_inc_not_zero(&mm->mm_users))
865 goto free;
866
1da177e4 867 while (count > 0) {
572d34b9 868 int this_len = min_t(int, count, PAGE_SIZE);
1da177e4 869
572d34b9 870 if (write && copy_from_user(page, buf, this_len)) {
1da177e4
LT		 871 copied = -EFAULT;
872 break;
873 }
572d34b9
ON		 874
875 this_len = access_remote_vm(mm, addr, page, this_len, write);
876 if (!this_len) {
1da177e4
LT		 877 if (!copied)
878 copied = -EIO;
879 break;
880 }
572d34b9
ON		 881
882 if (!write && copy_to_user(buf, page, this_len)) {
883 copied = -EFAULT;
884 break;
885 }
886
887 buf += this_len;
888 addr += this_len;
889 copied += this_len;
890 count -= this_len;
1da177e4 891 }
572d34b9 892 *ppos = addr;
30cd8903 893
6d08f2c7
ON		 894 mmput(mm);
895free:
30cd8903 896 free_page((unsigned long) page);
1da177e4
LT		 897 return copied;
898}
1da177e4 899
572d34b9
ON		 900static ssize_t mem_read(struct file *file, char __user *buf,
901 size_t count, loff_t *ppos)
902{
903 return mem_rw(file, buf, count, ppos, 0);
904}
905
906static ssize_t mem_write(struct file *file, const char __user *buf,
907 size_t count, loff_t *ppos)
908{
909 return mem_rw(file, (char __user*)buf, count, ppos, 1);
910}
911
85863e47 912loff_t mem_lseek(struct file *file, loff_t offset, int orig)
1da177e4
LT		 913{
914 switch (orig) {
915 case 0:
916 file->f_pos = offset;
917 break;
918 case 1:
919 file->f_pos += offset;
920 break;
921 default:
922 return -EINVAL;
923 }
924 force_successful_syscall_return();
925 return file->f_pos;
926}
927
e268337d
LT		 928static int mem_release(struct inode *inode, struct file *file)
929{
930 struct mm_struct *mm = file->private_data;
71879d3c 931 if (mm)
6d08f2c7 932 mmdrop(mm);
e268337d
LT		 933 return 0;
934}
935
00977a59 936static const struct file_operations proc_mem_operations = {
1da177e4
LT		 937 .llseek = mem_lseek,
938 .read = mem_read,
939 .write = mem_write,
940 .open = mem_open,
e268337d 941 .release = mem_release,
1da177e4
LT		 942};
943
b409e578
CW		 944static int environ_open(struct inode *inode, struct file *file)
945{
946 return __mem_open(inode, file, PTRACE_MODE_READ);
947}
948
315e28c8
JP		 949static ssize_t environ_read(struct file *file, char __user *buf,
950 size_t count, loff_t *ppos)
951{
315e28c8
JP		 952 char *page;
953 unsigned long src = *ppos;
b409e578
CW		 954 int ret = 0;
955 struct mm_struct *mm = file->private_data;
a3b609ef 956 unsigned long env_start, env_end;
315e28c8 957
8148a73c
MK		 958 /* Ensure the process spawned far enough to have an environment. */
959 if (!mm || !mm->env_end)
b409e578 960 return 0;
315e28c8 961
315e28c8
JP		 962 page = (char *)__get_free_page(GFP_TEMPORARY);
963 if (!page)
b409e578 964 return -ENOMEM;
315e28c8 965
d6f64b89 966 ret = 0;
b409e578
CW		 967 if (!atomic_inc_not_zero(&mm->mm_users))
968 goto free;
a3b609ef
MG		 969
970 down_read(&mm->mmap_sem);
971 env_start = mm->env_start;
972 env_end = mm->env_end;
973 up_read(&mm->mmap_sem);
974
315e28c8 975 while (count > 0) {
e8905ec2
DH		 976 size_t this_len, max_len;
977 int retval;
315e28c8 978
a3b609ef 979 if (src >= (env_end - env_start))
315e28c8
JP		 980 break;
981
a3b609ef 982 this_len = env_end - (env_start + src);
e8905ec2
DH		 983
984 max_len = min_t(size_t, PAGE_SIZE, count);
985 this_len = min(max_len, this_len);
315e28c8 986
a3b609ef 987 retval = access_remote_vm(mm, (env_start + src),
315e28c8
JP		 988 page, this_len, 0);
989
990 if (retval <= 0) {
991 ret = retval;
992 break;
993 }
994
995 if (copy_to_user(buf, page, retval)) {
996 ret = -EFAULT;
997 break;
998 }
999
1000 ret += retval;
1001 src += retval;
1002 buf += retval;
1003 count -= retval;
1004 }
1005 *ppos = src;
315e28c8 1006 mmput(mm);
b409e578
CW		 1007
1008free:
315e28c8 1009 free_page((unsigned long) page);
315e28c8
JP		 1010 return ret;
1011}
1012
1013static const struct file_operations proc_environ_operations = {
b409e578 1014 .open = environ_open,
315e28c8 1015 .read = environ_read,
87df8424 1016 .llseek = generic_file_llseek,
b409e578 1017 .release = mem_release,
315e28c8
JP		 1018};
1019
fa0cbbf1
DR		 1020static ssize_t oom_adj_read(struct file *file, char __user *buf, size_t count,
1021 loff_t *ppos)
1022{
496ad9aa 1023 struct task_struct *task = get_proc_task(file_inode(file));
fa0cbbf1
DR		 1024 char buffer[PROC_NUMBUF];
1025 int oom_adj = OOM_ADJUST_MIN;
1026 size_t len;
fa0cbbf1
DR		 1027
1028 if (!task)
1029 return -ESRCH;
f913da59
MH		 1030 if (task->signal->oom_score_adj == OOM_SCORE_ADJ_MAX)
1031 oom_adj = OOM_ADJUST_MAX;
1032 else
1033 oom_adj = (task->signal->oom_score_adj * -OOM_DISABLE) /
1034 OOM_SCORE_ADJ_MAX;
fa0cbbf1
DR		 1035 put_task_struct(task);
1036 len = snprintf(buffer, sizeof(buffer), "%d\n", oom_adj);
1037 return simple_read_from_buffer(buf, count, ppos, buffer, len);
1038}
1039
1d5f0acb
MH		 1040static int __set_oom_adj(struct file *file, int oom_adj, bool legacy)
1041{
1042 static DEFINE_MUTEX(oom_adj_mutex);
1043 struct task_struct *task;
1044 int err = 0;
1045
1046 task = get_proc_task(file_inode(file));
1047 if (!task)
1048 return -ESRCH;
1049
1050 mutex_lock(&oom_adj_mutex);
1051 if (legacy) {
1052 if (oom_adj < task->signal->oom_score_adj &&
1053 !capable(CAP_SYS_RESOURCE)) {
1054 err = -EACCES;
1055 goto err_unlock;
1056 }
1057 /*
1058 * /proc/pid/oom_adj is provided for legacy purposes, ask users to use
1059 * /proc/pid/oom_score_adj instead.
1060 */
1061 pr_warn_once("%s (%d): /proc/%d/oom_adj is deprecated, please use /proc/%d/oom_score_adj instead.\n",
1062 current->comm, task_pid_nr(current), task_pid_nr(task),
1063 task_pid_nr(task));
1064 } else {
1065 if ((short)oom_adj < task->signal->oom_score_adj_min &&
1066 !capable(CAP_SYS_RESOURCE)) {
1067 err = -EACCES;
1068 goto err_unlock;
1069 }
1070 }
1071
1072 task->signal->oom_score_adj = oom_adj;
1073 if (!legacy && has_capability_noaudit(current, CAP_SYS_RESOURCE))
1074 task->signal->oom_score_adj_min = (short)oom_adj;
1075 trace_oom_score_adj_update(task);
1076err_unlock:
1077 mutex_unlock(&oom_adj_mutex);
1078 put_task_struct(task);
1079 return err;
1080}
f913da59 1081
b72bdfa7
DR		 1082/*
1083 * /proc/pid/oom_adj exists solely for backwards compatibility with previous
1084 * kernels. The effective policy is defined by oom_score_adj, which has a
1085 * different scale: oom_adj grew exponentially and oom_score_adj grows linearly.
1086 * Values written to oom_adj are simply mapped linearly to oom_score_adj.
1087 * Processes that become oom disabled via oom_adj will still be oom disabled
1088 * with this implementation.
1089 *
1090 * oom_adj cannot be removed since existing userspace binaries use it.
1091 */
fa0cbbf1
DR		 1092static ssize_t oom_adj_write(struct file *file, const char __user *buf,
1093 size_t count, loff_t *ppos)
1094{
fa0cbbf1
DR		 1095 char buffer[PROC_NUMBUF];
1096 int oom_adj;
fa0cbbf1
DR		 1097 int err;
1098
1099 memset(buffer, 0, sizeof(buffer));
1100 if (count > sizeof(buffer) - 1)
1101 count = sizeof(buffer) - 1;
1102 if (copy_from_user(buffer, buf, count)) {
1103 err = -EFAULT;
1104 goto out;
1105 }
1106
1107 err = kstrtoint(strstrip(buffer), 0, &oom_adj);
1108 if (err)
1109 goto out;
1110 if ((oom_adj < OOM_ADJUST_MIN || oom_adj > OOM_ADJUST_MAX) &&
1111 oom_adj != OOM_DISABLE) {
1112 err = -EINVAL;
1113 goto out;
1114 }
1115
fa0cbbf1
DR		 1116 /*
1117 * Scale /proc/pid/oom_score_adj appropriately ensuring that a maximum
1118 * value is always attainable.
1119 */
1120 if (oom_adj == OOM_ADJUST_MAX)
1121 oom_adj = OOM_SCORE_ADJ_MAX;
1122 else
1123 oom_adj = (oom_adj * OOM_SCORE_ADJ_MAX) / -OOM_DISABLE;
1124
1d5f0acb 1125 err = __set_oom_adj(file, oom_adj, true);
fa0cbbf1
DR		 1126out:
1127 return err < 0 ? err : count;
1128}
1129
1130static const struct file_operations proc_oom_adj_operations = {
1131 .read = oom_adj_read,
1132 .write = oom_adj_write,
1133 .llseek = generic_file_llseek,
1134};
1135
a63d83f4
DR		 1136static ssize_t oom_score_adj_read(struct file *file, char __user *buf,
1137 size_t count, loff_t *ppos)
1138{
496ad9aa 1139 struct task_struct *task = get_proc_task(file_inode(file));
a63d83f4 1140 char buffer[PROC_NUMBUF];
a9c58b90 1141 short oom_score_adj = OOM_SCORE_ADJ_MIN;
a63d83f4
DR		 1142 size_t len;
1143
1144 if (!task)
1145 return -ESRCH;
f913da59 1146 oom_score_adj = task->signal->oom_score_adj;
a63d83f4 1147 put_task_struct(task);
a9c58b90 1148 len = snprintf(buffer, sizeof(buffer), "%hd\n", oom_score_adj);
a63d83f4
DR		 1149 return simple_read_from_buffer(buf, count, ppos, buffer, len);
1150}
1151
1152static ssize_t oom_score_adj_write(struct file *file, const char __user *buf,
1153 size_t count, loff_t *ppos)
1154{
a63d83f4 1155 char buffer[PROC_NUMBUF];
0a8cb8e3 1156 int oom_score_adj;
a63d83f4
DR		 1157 int err;
1158
1159 memset(buffer, 0, sizeof(buffer));
1160 if (count > sizeof(buffer) - 1)
1161 count = sizeof(buffer) - 1;
723548bf
DR		 1162 if (copy_from_user(buffer, buf, count)) {
1163 err = -EFAULT;
1164 goto out;
1165 }
a63d83f4 1166
0a8cb8e3 1167 err = kstrtoint(strstrip(buffer), 0, &oom_score_adj);
a63d83f4 1168 if (err)
723548bf 1169 goto out;
a63d83f4 1170 if (oom_score_adj < OOM_SCORE_ADJ_MIN ||
723548bf
DR		 1171 oom_score_adj > OOM_SCORE_ADJ_MAX) {
1172 err = -EINVAL;
1173 goto out;
1174 }
a63d83f4 1175
1d5f0acb 1176 err = __set_oom_adj(file, oom_score_adj, false);
723548bf
DR		 1177out:
1178 return err < 0 ? err : count;
a63d83f4
DR		 1179}
1180
1181static const struct file_operations proc_oom_score_adj_operations = {
1182 .read = oom_score_adj_read,
1183 .write = oom_score_adj_write,
6038f373 1184 .llseek = default_llseek,
a63d83f4
DR		 1185};
1186
1da177e4
LT		 1187#ifdef CONFIG_AUDITSYSCALL
1188#define TMPBUFLEN 21
1189static ssize_t proc_loginuid_read(struct file * file, char __user * buf,
1190 size_t count, loff_t *ppos)
1191{
496ad9aa 1192 struct inode * inode = file_inode(file);
99f89551 1193 struct task_struct *task = get_proc_task(inode);
1da177e4
LT		 1194 ssize_t length;
1195 char tmpbuf[TMPBUFLEN];
1196
99f89551
EB		 1197 if (!task)
1198 return -ESRCH;
1da177e4 1199 length = scnprintf(tmpbuf, TMPBUFLEN, "%u",
e1760bd5
EB		 1200 from_kuid(file->f_cred->user_ns,
1201 audit_get_loginuid(task)));
99f89551 1202 put_task_struct(task);
1da177e4
LT		 1203 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1204}
1205
1206static ssize_t proc_loginuid_write(struct file * file, const char __user * buf,
1207 size_t count, loff_t *ppos)
1208{
496ad9aa 1209 struct inode * inode = file_inode(file);
1da177e4 1210 uid_t loginuid;
e1760bd5 1211 kuid_t kloginuid;
774636e1 1212 int rv;
1da177e4 1213
7dc52157
PM		 1214 rcu_read_lock();
1215 if (current != pid_task(proc_pid(inode), PIDTYPE_PID)) {
1216 rcu_read_unlock();
1da177e4 1217 return -EPERM;
7dc52157
PM		 1218 }
1219 rcu_read_unlock();
1da177e4 1220
1da177e4
LT		 1221 if (*ppos != 0) {
1222 /* No partial writes. */
1223 return -EINVAL;
1224 }
1da177e4 1225
774636e1
AD		 1226 rv = kstrtou32_from_user(buf, count, 10, &loginuid);
1227 if (rv < 0)
1228 return rv;
81407c84
EP		 1229
1230 /* is userspace tring to explicitly UNSET the loginuid? */
1231 if (loginuid == AUDIT_UID_UNSET) {
1232 kloginuid = INVALID_UID;
1233 } else {
1234 kloginuid = make_kuid(file->f_cred->user_ns, loginuid);
774636e1
AD		 1235 if (!uid_valid(kloginuid))
1236 return -EINVAL;
e1760bd5
EB		 1237 }
1238
774636e1
AD		 1239 rv = audit_set_loginuid(kloginuid);
1240 if (rv < 0)
1241 return rv;
1242 return count;
1da177e4
LT		 1243}
1244
00977a59 1245static const struct file_operations proc_loginuid_operations = {
1da177e4
LT		 1246 .read = proc_loginuid_read,
1247 .write = proc_loginuid_write,
87df8424 1248 .llseek = generic_file_llseek,
1da177e4 1249};
1e0bd755
EP		 1250
1251static ssize_t proc_sessionid_read(struct file * file, char __user * buf,
1252 size_t count, loff_t *ppos)
1253{
496ad9aa 1254 struct inode * inode = file_inode(file);
1e0bd755
EP		 1255 struct task_struct *task = get_proc_task(inode);
1256 ssize_t length;
1257 char tmpbuf[TMPBUFLEN];
1258
1259 if (!task)
1260 return -ESRCH;
1261 length = scnprintf(tmpbuf, TMPBUFLEN, "%u",
1262 audit_get_sessionid(task));
1263 put_task_struct(task);
1264 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1265}
1266
1267static const struct file_operations proc_sessionid_operations = {
1268 .read = proc_sessionid_read,
87df8424 1269 .llseek = generic_file_llseek,
1e0bd755 1270};
1da177e4
LT		 1271#endif
1272
f4f154fd
AM		 1273#ifdef CONFIG_FAULT_INJECTION
1274static ssize_t proc_fault_inject_read(struct file * file, char __user * buf,
1275 size_t count, loff_t *ppos)
1276{
496ad9aa 1277 struct task_struct *task = get_proc_task(file_inode(file));
f4f154fd
AM		 1278 char buffer[PROC_NUMBUF];
1279 size_t len;
1280 int make_it_fail;
f4f154fd
AM		 1281
1282 if (!task)
1283 return -ESRCH;
1284 make_it_fail = task->make_it_fail;
1285 put_task_struct(task);
1286
1287 len = snprintf(buffer, sizeof(buffer), "%i\n", make_it_fail);
0c28f287
AM		 1288
1289 return simple_read_from_buffer(buf, count, ppos, buffer, len);
f4f154fd
AM		 1290}
1291
1292static ssize_t proc_fault_inject_write(struct file * file,
1293 const char __user * buf, size_t count, loff_t *ppos)
1294{
1295 struct task_struct *task;
774636e1 1296 char buffer[PROC_NUMBUF];
f4f154fd 1297 int make_it_fail;
774636e1 1298 int rv;
f4f154fd
AM		 1299
1300 if (!capable(CAP_SYS_RESOURCE))
1301 return -EPERM;
1302 memset(buffer, 0, sizeof(buffer));
1303 if (count > sizeof(buffer) - 1)
1304 count = sizeof(buffer) - 1;
1305 if (copy_from_user(buffer, buf, count))
1306 return -EFAULT;
774636e1
AD		 1307 rv = kstrtoint(strstrip(buffer), 0, &make_it_fail);
1308 if (rv < 0)
1309 return rv;
16caed31
DJ		 1310 if (make_it_fail < 0 || make_it_fail > 1)
1311 return -EINVAL;
1312
496ad9aa 1313 task = get_proc_task(file_inode(file));
f4f154fd
AM		 1314 if (!task)
1315 return -ESRCH;
1316 task->make_it_fail = make_it_fail;
1317 put_task_struct(task);
cba8aafe
VL		 1318
1319 return count;
f4f154fd
AM		 1320}
1321
00977a59 1322static const struct file_operations proc_fault_inject_operations = {
f4f154fd
AM		 1323 .read = proc_fault_inject_read,
1324 .write = proc_fault_inject_write,
87df8424 1325 .llseek = generic_file_llseek,
f4f154fd
AM		 1326};
1327#endif
1328
9745512c 1329
43ae34cb
IM		 1330#ifdef CONFIG_SCHED_DEBUG
1331/*
1332 * Print out various scheduling related per-task fields:
1333 */
1334static int sched_show(struct seq_file *m, void *v)
1335{
1336 struct inode *inode = m->private;
1337 struct task_struct *p;
1338
43ae34cb
IM		 1339 p = get_proc_task(inode);
1340 if (!p)
1341 return -ESRCH;
1342 proc_sched_show_task(p, m);
1343
1344 put_task_struct(p);
1345
1346 return 0;
1347}
1348
1349static ssize_t
1350sched_write(struct file *file, const char __user *buf,
1351 size_t count, loff_t *offset)
1352{
496ad9aa 1353 struct inode *inode = file_inode(file);
43ae34cb
IM		 1354 struct task_struct *p;
1355
43ae34cb
IM		 1356 p = get_proc_task(inode);
1357 if (!p)
1358 return -ESRCH;
1359 proc_sched_set_task(p);
1360
1361 put_task_struct(p);
1362
1363 return count;
1364}
1365
1366static int sched_open(struct inode *inode, struct file *filp)
1367{
c6a34058 1368 return single_open(filp, sched_show, inode);
43ae34cb
IM		 1369}
1370
1371static const struct file_operations proc_pid_sched_operations = {
1372 .open = sched_open,
1373 .read = seq_read,
1374 .write = sched_write,
1375 .llseek = seq_lseek,
5ea473a1 1376 .release = single_release,
43ae34cb
IM		 1377};
1378
1379#endif
1380
5091faa4
MG		 1381#ifdef CONFIG_SCHED_AUTOGROUP
1382/*
1383 * Print out autogroup related information:
1384 */
1385static int sched_autogroup_show(struct seq_file *m, void *v)
1386{
1387 struct inode *inode = m->private;
1388 struct task_struct *p;
1389
1390 p = get_proc_task(inode);
1391 if (!p)
1392 return -ESRCH;
1393 proc_sched_autogroup_show_task(p, m);
1394
1395 put_task_struct(p);
1396
1397 return 0;
1398}
1399
1400static ssize_t
1401sched_autogroup_write(struct file *file, const char __user *buf,
1402 size_t count, loff_t *offset)
1403{
496ad9aa 1404 struct inode *inode = file_inode(file);
5091faa4
MG		 1405 struct task_struct *p;
1406 char buffer[PROC_NUMBUF];
0a8cb8e3 1407 int nice;
5091faa4
MG		 1408 int err;
1409
1410 memset(buffer, 0, sizeof(buffer));
1411 if (count > sizeof(buffer) - 1)
1412 count = sizeof(buffer) - 1;
1413 if (copy_from_user(buffer, buf, count))
1414 return -EFAULT;
1415
0a8cb8e3
AD		 1416 err = kstrtoint(strstrip(buffer), 0, &nice);
1417 if (err < 0)
1418 return err;
5091faa4
MG		 1419
1420 p = get_proc_task(inode);
1421 if (!p)
1422 return -ESRCH;
1423
2e5b5b3a 1424 err = proc_sched_autogroup_set_nice(p, nice);
5091faa4
MG		 1425 if (err)
1426 count = err;
1427
1428 put_task_struct(p);
1429
1430 return count;
1431}
1432
1433static int sched_autogroup_open(struct inode *inode, struct file *filp)
1434{
1435 int ret;
1436
1437 ret = single_open(filp, sched_autogroup_show, NULL);
1438 if (!ret) {
1439 struct seq_file *m = filp->private_data;
1440
1441 m->private = inode;
1442 }
1443 return ret;
1444}
1445
1446static const struct file_operations proc_pid_sched_autogroup_operations = {
1447 .open = sched_autogroup_open,
1448 .read = seq_read,
1449 .write = sched_autogroup_write,
1450 .llseek = seq_lseek,
1451 .release = single_release,
1452};
1453
1454#endif /* CONFIG_SCHED_AUTOGROUP */
1455
4614a696 1456static ssize_t comm_write(struct file *file, const char __user *buf,
1457 size_t count, loff_t *offset)
1458{
496ad9aa 1459 struct inode *inode = file_inode(file);
4614a696 1460 struct task_struct *p;
1461 char buffer[TASK_COMM_LEN];
830e0fc9 1462 const size_t maxlen = sizeof(buffer) - 1;
4614a696 1463
1464 memset(buffer, 0, sizeof(buffer));
830e0fc9 1465 if (copy_from_user(buffer, buf, count > maxlen ? maxlen : count))
4614a696 1466 return -EFAULT;
1467
1468 p = get_proc_task(inode);
1469 if (!p)
1470 return -ESRCH;
1471
1472 if (same_thread_group(current, p))
1473 set_task_comm(p, buffer);
1474 else
1475 count = -EINVAL;
1476
1477 put_task_struct(p);
1478
1479 return count;
1480}
1481
1482static int comm_show(struct seq_file *m, void *v)
1483{
1484 struct inode *inode = m->private;
1485 struct task_struct *p;
1486
1487 p = get_proc_task(inode);
1488 if (!p)
1489 return -ESRCH;
1490
1491 task_lock(p);
1492 seq_printf(m, "%s\n", p->comm);
1493 task_unlock(p);
1494
1495 put_task_struct(p);
1496
1497 return 0;
1498}
1499
1500static int comm_open(struct inode *inode, struct file *filp)
1501{
c6a34058 1502 return single_open(filp, comm_show, inode);
4614a696 1503}
1504
1505static const struct file_operations proc_pid_set_comm_operations = {
1506 .open = comm_open,
1507 .read = seq_read,
1508 .write = comm_write,
1509 .llseek = seq_lseek,
1510 .release = single_release,
1511};
1512
7773fbc5 1513static int proc_exe_link(struct dentry *dentry, struct path *exe_path)
925d1c40
MH		 1514{
1515 struct task_struct *task;
1516 struct mm_struct *mm;
1517 struct file *exe_file;
1518
2b0143b5 1519 task = get_proc_task(d_inode(dentry));
925d1c40
MH		 1520 if (!task)
1521 return -ENOENT;
1522 mm = get_task_mm(task);
1523 put_task_struct(task);
1524 if (!mm)
1525 return -ENOENT;
1526 exe_file = get_mm_exe_file(mm);
1527 mmput(mm);
1528 if (exe_file) {
1529 *exe_path = exe_file->f_path;
1530 path_get(&exe_file->f_path);
1531 fput(exe_file);
1532 return 0;
1533 } else
1534 return -ENOENT;
1535}
1536
6b255391 1537static const char *proc_pid_get_link(struct dentry *dentry,
fceef393
AV		 1538 struct inode *inode,
1539 struct delayed_call *done)
1da177e4 1540{
408ef013 1541 struct path path;
1da177e4
LT		 1542 int error = -EACCES;
1543
6b255391
AV		 1544 if (!dentry)
1545 return ERR_PTR(-ECHILD);
1546
778c1144
EB		 1547 /* Are we allowed to snoop on the tasks file descriptors? */
1548 if (!proc_fd_access_allowed(inode))
1da177e4 1549 goto out;
1da177e4 1550
408ef013
CH		 1551 error = PROC_I(inode)->op.proc_get_link(dentry, &path);
1552 if (error)
1553 goto out;
1554
6e77137b 1555 nd_jump_link(&path);
408ef013 1556 return NULL;
1da177e4 1557out:
008b150a 1558 return ERR_PTR(error);
1da177e4
LT		 1559}
1560
3dcd25f3 1561static int do_proc_readlink(struct path *path, char __user *buffer, int buflen)
1da177e4 1562{
e12ba74d 1563 char *tmp = (char*)__get_free_page(GFP_TEMPORARY);
3dcd25f3 1564 char *pathname;
1da177e4
LT		 1565 int len;
1566
1567 if (!tmp)
1568 return -ENOMEM;
0c28f287 1569
7b2a69ba 1570 pathname = d_path(path, tmp, PAGE_SIZE);
3dcd25f3
JB		 1571 len = PTR_ERR(pathname);
1572 if (IS_ERR(pathname))
1da177e4 1573 goto out;
3dcd25f3 1574 len = tmp + PAGE_SIZE - 1 - pathname;
1da177e4
LT		 1575
1576 if (len > buflen)
1577 len = buflen;
3dcd25f3 1578 if (copy_to_user(buffer, pathname, len))
1da177e4
LT		 1579 len = -EFAULT;
1580 out:
1581 free_page((unsigned long)tmp);
1582 return len;
1583}
1584
1585static int proc_pid_readlink(struct dentry * dentry, char __user * buffer, int buflen)
1586{
1587 int error = -EACCES;
2b0143b5 1588 struct inode *inode = d_inode(dentry);
3dcd25f3 1589 struct path path;
1da177e4 1590
778c1144
EB		 1591 /* Are we allowed to snoop on the tasks file descriptors? */
1592 if (!proc_fd_access_allowed(inode))
1da177e4 1593 goto out;
1da177e4 1594
7773fbc5 1595 error = PROC_I(inode)->op.proc_get_link(dentry, &path);
1da177e4
LT		 1596 if (error)
1597 goto out;
1598
3dcd25f3
JB		 1599 error = do_proc_readlink(&path, buffer, buflen);
1600 path_put(&path);
1da177e4 1601out:
1da177e4
LT		 1602 return error;
1603}
1604
faf60af1 1605const struct inode_operations proc_pid_link_inode_operations = {
1da177e4 1606 .readlink = proc_pid_readlink,
6b255391 1607 .get_link = proc_pid_get_link,
6d76fa58 1608 .setattr = proc_setattr,
1da177e4
LT		 1609};
1610
28a6d671
EB		 1611
1612/* building an inode */
1613
6b4e306a 1614struct inode *proc_pid_make_inode(struct super_block * sb, struct task_struct *task)
28a6d671
EB		 1615{
1616 struct inode * inode;
1617 struct proc_inode *ei;
c69e8d9c 1618 const struct cred *cred;
1da177e4 1619
28a6d671 1620 /* We need a new inode */
1da177e4 1621
28a6d671
EB		 1622 inode = new_inode(sb);
1623 if (!inode)
1624 goto out;
1625
1626 /* Common stuff */
1627 ei = PROC_I(inode);
85fe4025 1628 inode->i_ino = get_next_ino();
28a6d671 1629 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
28a6d671
EB		 1630 inode->i_op = &proc_def_inode_operations;
1631
1632 /*
1633 * grab the reference to task.
1634 */
1a657f78 1635 ei->pid = get_task_pid(task, PIDTYPE_PID);
28a6d671
EB		 1636 if (!ei->pid)
1637 goto out_unlock;
1638
28a6d671 1639 if (task_dumpable(task)) {
c69e8d9c
DH		 1640 rcu_read_lock();
1641 cred = __task_cred(task);
1642 inode->i_uid = cred->euid;
1643 inode->i_gid = cred->egid;
1644 rcu_read_unlock();
1da177e4 1645 }
28a6d671
EB		 1646 security_task_to_inode(task, inode);
1647
1da177e4 1648out:
28a6d671
EB		 1649 return inode;
1650
1651out_unlock:
1652 iput(inode);
1653 return NULL;
1da177e4
LT		 1654}
1655
6b4e306a 1656int pid_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
1da177e4 1657{
2b0143b5 1658 struct inode *inode = d_inode(dentry);
28a6d671 1659 struct task_struct *task;
c69e8d9c 1660 const struct cred *cred;
0499680a 1661 struct pid_namespace *pid = dentry->d_sb->s_fs_info;
c69e8d9c 1662
28a6d671 1663 generic_fillattr(inode, stat);
1da177e4 1664
28a6d671 1665 rcu_read_lock();
dcb0f222
EB		 1666 stat->uid = GLOBAL_ROOT_UID;
1667 stat->gid = GLOBAL_ROOT_GID;
28a6d671
EB		 1668 task = pid_task(proc_pid(inode), PIDTYPE_PID);
1669 if (task) {
0499680a
VK		 1670 if (!has_pid_permissions(pid, task, 2)) {
1671 rcu_read_unlock();
1672 /*
1673 * This doesn't prevent learning whether PID exists,
1674 * it only makes getattr() consistent with readdir().
1675 */
1676 return -ENOENT;
1677 }
28a6d671
EB		 1678 if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) ||
1679 task_dumpable(task)) {
c69e8d9c
DH		 1680 cred = __task_cred(task);
1681 stat->uid = cred->euid;
1682 stat->gid = cred->egid;
1da177e4
LT		 1683 }
1684 }
28a6d671 1685 rcu_read_unlock();
d6e71144 1686 return 0;
1da177e4
LT		 1687}
1688
1da177e4
LT		 1689/* dentry stuff */
1690
1691/*
1692 * Exceptional case: normally we are not allowed to unhash a busy
1693 * directory. In this case, however, we can do it - no aliasing problems
1694 * due to the way we treat inodes.
1695 *
1696 * Rewrite the inode's ownerships here because the owning task may have
1697 * performed a setuid(), etc.
99f89551
EB		 1698 *
1699 * Before the /proc/pid/status file was created the only way to read
1700 * the effective uid of a /process was to stat /proc/pid. Reading
1701 * /proc/pid/status is slow enough that procps and other packages
1702 * kept stating /proc/pid. To keep the rules in /proc simple I have
1703 * made this apply to all per process world readable and executable
1704 * directories.
1da177e4 1705 */
0b728e19 1706int pid_revalidate(struct dentry *dentry, unsigned int flags)
1da177e4 1707{
34286d66
NP		 1708 struct inode *inode;
1709 struct task_struct *task;
c69e8d9c
DH		 1710 const struct cred *cred;
1711
0b728e19 1712 if (flags & LOOKUP_RCU)
34286d66
NP		 1713 return -ECHILD;
1714
2b0143b5 1715 inode = d_inode(dentry);
34286d66
NP		 1716 task = get_proc_task(inode);
1717
99f89551
EB		 1718 if (task) {
1719 if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) ||
1720 task_dumpable(task)) {
c69e8d9c
DH		 1721 rcu_read_lock();
1722 cred = __task_cred(task);
1723 inode->i_uid = cred->euid;
1724 inode->i_gid = cred->egid;
1725 rcu_read_unlock();
1da177e4 1726 } else {
dcb0f222
EB		 1727 inode->i_uid = GLOBAL_ROOT_UID;
1728 inode->i_gid = GLOBAL_ROOT_GID;
1da177e4 1729 }
9ee8ab9f 1730 inode->i_mode &= ~(S_ISUID | S_ISGID);
1da177e4 1731 security_task_to_inode(task, inode);
99f89551 1732 put_task_struct(task);
1da177e4
LT		 1733 return 1;
1734 }
1da177e4
LT		 1735 return 0;
1736}
1737
d855a4b7
ON		 1738static inline bool proc_inode_is_dead(struct inode *inode)
1739{
1740 return !proc_pid(inode)->tasks[PIDTYPE_PID].first;
1741}
1742
1dd704b6
DH		 1743int pid_delete_dentry(const struct dentry *dentry)
1744{
1745 /* Is the task we represent dead?
1746 * If so, then don't put the dentry on the lru list,
1747 * kill it immediately.
1748 */
2b0143b5 1749 return proc_inode_is_dead(d_inode(dentry));
1dd704b6
DH		 1750}
1751
6b4e306a 1752const struct dentry_operations pid_dentry_operations =
28a6d671
EB		 1753{
1754 .d_revalidate = pid_revalidate,
1755 .d_delete = pid_delete_dentry,
1756};
1757
1758/* Lookups */
1759
1c0d04c9
EB		 1760/*
1761 * Fill a directory entry.
1762 *
1763 * If possible create the dcache entry and derive our inode number and
1764 * file type from dcache entry.
1765 *
1766 * Since all of the proc inode numbers are dynamically generated, the inode
1767 * numbers do not exist until the inode is cache. This means creating the
1768 * the dcache entry in readdir is necessary to keep the inode numbers
1769 * reported by readdir in sync with the inode numbers reported
1770 * by stat.
1771 */
f0c3b509 1772bool proc_fill_cache(struct file *file, struct dir_context *ctx,
6b4e306a 1773 const char *name, int len,
c5141e6d 1774 instantiate_t instantiate, struct task_struct *task, const void *ptr)
61a28784 1775{
f0c3b509 1776 struct dentry *child, *dir = file->f_path.dentry;
1df98b8b 1777 struct qstr qname = QSTR_INIT(name, len);
61a28784 1778 struct inode *inode;
1df98b8b
AV		 1779 unsigned type;
1780 ino_t ino;
61a28784 1781
1df98b8b 1782 child = d_hash_and_lookup(dir, &qname);
61a28784 1783 if (!child) {
3781764b
AV		 1784 DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq);
1785 child = d_alloc_parallel(dir, &qname, &wq);
1786 if (IS_ERR(child))
1df98b8b 1787 goto end_instantiate;
3781764b
AV		 1788 if (d_in_lookup(child)) {
1789 int err = instantiate(d_inode(dir), child, task, ptr);
1790 d_lookup_done(child);
1791 if (err < 0) {
1792 dput(child);
1793 goto end_instantiate;
1794 }
61a28784
EB		 1795 }
1796 }
2b0143b5 1797 inode = d_inode(child);
147ce699
AV		 1798 ino = inode->i_ino;
1799 type = inode->i_mode >> 12;
61a28784 1800 dput(child);
f0c3b509 1801 return dir_emit(ctx, name, len, ino, type);
1df98b8b
AV		 1802
1803end_instantiate:
1804 return dir_emit(ctx, name, len, 1, DT_UNKNOWN);
61a28784
EB		 1805}
1806
640708a2
PE		 1807/*
1808 * dname_to_vma_addr - maps a dentry name into two unsigned longs
1809 * which represent vma start and end addresses.
1810 */
1811static int dname_to_vma_addr(struct dentry *dentry,
1812 unsigned long *start, unsigned long *end)
1813{
1814 if (sscanf(dentry->d_name.name, "%lx-%lx", start, end) != 2)
1815 return -EINVAL;
1816
1817 return 0;
1818}
1819
0b728e19 1820static int map_files_d_revalidate(struct dentry *dentry, unsigned int flags)
640708a2
PE		 1821{
1822 unsigned long vm_start, vm_end;
1823 bool exact_vma_exists = false;
1824 struct mm_struct *mm = NULL;
1825 struct task_struct *task;
1826 const struct cred *cred;
1827 struct inode *inode;
1828 int status = 0;
1829
0b728e19 1830 if (flags & LOOKUP_RCU)
640708a2
PE		 1831 return -ECHILD;
1832
2b0143b5 1833 inode = d_inode(dentry);
640708a2
PE		 1834 task = get_proc_task(inode);
1835 if (!task)
1836 goto out_notask;
1837
caaee623 1838 mm = mm_access(task, PTRACE_MODE_READ_FSCREDS);
2344bec7 1839 if (IS_ERR_OR_NULL(mm))
640708a2
PE		 1840 goto out;
1841
1842 if (!dname_to_vma_addr(dentry, &vm_start, &vm_end)) {
1843 down_read(&mm->mmap_sem);
1844 exact_vma_exists = !!find_exact_vma(mm, vm_start, vm_end);
1845 up_read(&mm->mmap_sem);
1846 }
1847
1848 mmput(mm);
1849
1850 if (exact_vma_exists) {
1851 if (task_dumpable(task)) {
1852 rcu_read_lock();
1853 cred = __task_cred(task);
1854 inode->i_uid = cred->euid;
1855 inode->i_gid = cred->egid;
1856 rcu_read_unlock();
1857 } else {
dcb0f222
EB		 1858 inode->i_uid = GLOBAL_ROOT_UID;
1859 inode->i_gid = GLOBAL_ROOT_GID;
640708a2
PE		 1860 }
1861 security_task_to_inode(task, inode);
1862 status = 1;
1863 }
1864
1865out:
1866 put_task_struct(task);
1867
1868out_notask:
640708a2
PE		 1869 return status;
1870}
1871
1872static const struct dentry_operations tid_map_files_dentry_operations = {
1873 .d_revalidate = map_files_d_revalidate,
1874 .d_delete = pid_delete_dentry,
1875};
1876
6b255391 1877static int map_files_get_link(struct dentry *dentry, struct path *path)
640708a2
PE		 1878{
1879 unsigned long vm_start, vm_end;
1880 struct vm_area_struct *vma;
1881 struct task_struct *task;
1882 struct mm_struct *mm;
1883 int rc;
1884
1885 rc = -ENOENT;
2b0143b5 1886 task = get_proc_task(d_inode(dentry));
640708a2
PE		 1887 if (!task)
1888 goto out;
1889
1890 mm = get_task_mm(task);
1891 put_task_struct(task);
1892 if (!mm)
1893 goto out;
1894
1895 rc = dname_to_vma_addr(dentry, &vm_start, &vm_end);
1896 if (rc)
1897 goto out_mmput;
1898
70335abb 1899 rc = -ENOENT;
640708a2
PE		 1900 down_read(&mm->mmap_sem);
1901 vma = find_exact_vma(mm, vm_start, vm_end);
1902 if (vma && vma->vm_file) {
1903 *path = vma->vm_file->f_path;
1904 path_get(path);
1905 rc = 0;
1906 }
1907 up_read(&mm->mmap_sem);
1908
1909out_mmput:
1910 mmput(mm);
1911out:
1912 return rc;
1913}
1914
1915struct map_files_info {
7b540d06 1916 fmode_t mode;
640708a2
PE		 1917 unsigned long len;
1918 unsigned char name[4*sizeof(long)+2]; /* max: %lx-%lx\0 */
1919};
1920
bdb4d100
CO		 1921/*
1922 * Only allow CAP_SYS_ADMIN to follow the links, due to concerns about how the
1923 * symlinks may be used to bypass permissions on ancestor directories in the
1924 * path to the file in question.
1925 */
1926static const char *
6b255391 1927proc_map_files_get_link(struct dentry *dentry,
fceef393
AV		 1928 struct inode *inode,
1929 struct delayed_call *done)
bdb4d100
CO		 1930{
1931 if (!capable(CAP_SYS_ADMIN))
1932 return ERR_PTR(-EPERM);
1933
fceef393 1934 return proc_pid_get_link(dentry, inode, done);
bdb4d100
CO		 1935}
1936
1937/*
6b255391 1938 * Identical to proc_pid_link_inode_operations except for get_link()
bdb4d100
CO		 1939 */
1940static const struct inode_operations proc_map_files_link_inode_operations = {
1941 .readlink = proc_pid_readlink,
6b255391 1942 .get_link = proc_map_files_get_link,
bdb4d100
CO		 1943 .setattr = proc_setattr,
1944};
1945
c52a47ac 1946static int
640708a2
PE		 1947proc_map_files_instantiate(struct inode *dir, struct dentry *dentry,
1948 struct task_struct *task, const void *ptr)
1949{
7b540d06 1950 fmode_t mode = (fmode_t)(unsigned long)ptr;
640708a2
PE		 1951 struct proc_inode *ei;
1952 struct inode *inode;
1953
640708a2
PE		 1954 inode = proc_pid_make_inode(dir->i_sb, task);
1955 if (!inode)
c52a47ac 1956 return -ENOENT;
640708a2
PE		 1957
1958 ei = PROC_I(inode);
6b255391 1959 ei->op.proc_get_link = map_files_get_link;
640708a2 1960
bdb4d100 1961 inode->i_op = &proc_map_files_link_inode_operations;
640708a2
PE		 1962 inode->i_size = 64;
1963 inode->i_mode = S_IFLNK;
1964
7b540d06 1965 if (mode & FMODE_READ)
640708a2 1966 inode->i_mode |= S_IRUSR;
7b540d06 1967 if (mode & FMODE_WRITE)
640708a2
PE		 1968 inode->i_mode |= S_IWUSR;
1969
1970 d_set_d_op(dentry, &tid_map_files_dentry_operations);
1971 d_add(dentry, inode);
1972
c52a47ac 1973 return 0;
640708a2
PE		 1974}
1975
1976static struct dentry *proc_map_files_lookup(struct inode *dir,
00cd8dd3 1977 struct dentry *dentry, unsigned int flags)
640708a2
PE		 1978{
1979 unsigned long vm_start, vm_end;
1980 struct vm_area_struct *vma;
1981 struct task_struct *task;
c52a47ac 1982 int result;
640708a2
PE		 1983 struct mm_struct *mm;
1984
c52a47ac 1985 result = -ENOENT;
640708a2
PE		 1986 task = get_proc_task(dir);
1987 if (!task)
1988 goto out;
1989
c52a47ac 1990 result = -EACCES;
caaee623 1991 if (!ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS))
640708a2
PE		 1992 goto out_put_task;
1993
c52a47ac 1994 result = -ENOENT;
640708a2 1995 if (dname_to_vma_addr(dentry, &vm_start, &vm_end))
eb94cd96 1996 goto out_put_task;
640708a2
PE		 1997
1998 mm = get_task_mm(task);
1999 if (!mm)
eb94cd96 2000 goto out_put_task;
640708a2
PE		 2001
2002 down_read(&mm->mmap_sem);
2003 vma = find_exact_vma(mm, vm_start, vm_end);
2004 if (!vma)
2005 goto out_no_vma;
2006
05f56484
SK		 2007 if (vma->vm_file)
2008 result = proc_map_files_instantiate(dir, dentry, task,
2009 (void *)(unsigned long)vma->vm_file->f_mode);
640708a2
PE		 2010
2011out_no_vma:
2012 up_read(&mm->mmap_sem);
2013 mmput(mm);
640708a2
PE		 2014out_put_task:
2015 put_task_struct(task);
2016out:
c52a47ac 2017 return ERR_PTR(result);
640708a2
PE		 2018}
2019
2020static const struct inode_operations proc_map_files_inode_operations = {
2021 .lookup = proc_map_files_lookup,
2022 .permission = proc_fd_permission,
2023 .setattr = proc_setattr,
2024};
2025
2026static int
f0c3b509 2027proc_map_files_readdir(struct file *file, struct dir_context *ctx)
640708a2 2028{
640708a2
PE		 2029 struct vm_area_struct *vma;
2030 struct task_struct *task;
2031 struct mm_struct *mm;
f0c3b509
AV		 2032 unsigned long nr_files, pos, i;
2033 struct flex_array *fa = NULL;
2034 struct map_files_info info;
2035 struct map_files_info *p;
640708a2
PE		 2036 int ret;
2037
640708a2 2038 ret = -ENOENT;
f0c3b509 2039 task = get_proc_task(file_inode(file));
640708a2
PE		 2040 if (!task)
2041 goto out;
2042
2043 ret = -EACCES;
caaee623 2044 if (!ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS))
640708a2
PE		 2045 goto out_put_task;
2046
2047 ret = 0;
f0c3b509
AV		 2048 if (!dir_emit_dots(file, ctx))
2049 goto out_put_task;
640708a2 2050
f0c3b509
AV		 2051 mm = get_task_mm(task);
2052 if (!mm)
2053 goto out_put_task;
2054 down_read(&mm->mmap_sem);
640708a2 2055
f0c3b509 2056 nr_files = 0;
640708a2 2057
f0c3b509
AV		 2058 /*
2059 * We need two passes here:
2060 *
2061 * 1) Collect vmas of mapped files with mmap_sem taken
2062 * 2) Release mmap_sem and instantiate entries
2063 *
2064 * otherwise we get lockdep complained, since filldir()
2065 * routine might require mmap_sem taken in might_fault().
2066 */
640708a2 2067
f0c3b509
AV		 2068 for (vma = mm->mmap, pos = 2; vma; vma = vma->vm_next) {
2069 if (vma->vm_file && ++pos > ctx->pos)
2070 nr_files++;
2071 }
2072
2073 if (nr_files) {
2074 fa = flex_array_alloc(sizeof(info), nr_files,
2075 GFP_KERNEL);
2076 if (!fa || flex_array_prealloc(fa, 0, nr_files,
2077 GFP_KERNEL)) {
2078 ret = -ENOMEM;
2079 if (fa)
2080 flex_array_free(fa);
2081 up_read(&mm->mmap_sem);
2082 mmput(mm);
2083 goto out_put_task;
640708a2 2084 }
f0c3b509
AV		 2085 for (i = 0, vma = mm->mmap, pos = 2; vma;
2086 vma = vma->vm_next) {
2087 if (!vma->vm_file)
2088 continue;
2089 if (++pos <= ctx->pos)
2090 continue;
2091
2092 info.mode = vma->vm_file->f_mode;
2093 info.len = snprintf(info.name,
2094 sizeof(info.name), "%lx-%lx",
2095 vma->vm_start, vma->vm_end);
2096 if (flex_array_put(fa, i++, &info, GFP_KERNEL))
2097 BUG();
640708a2 2098 }
640708a2 2099 }
f0c3b509
AV		 2100 up_read(&mm->mmap_sem);
2101
2102 for (i = 0; i < nr_files; i++) {
2103 p = flex_array_get(fa, i);
2104 if (!proc_fill_cache(file, ctx,
2105 p->name, p->len,
2106 proc_map_files_instantiate,
2107 task,
2108 (void *)(unsigned long)p->mode))
2109 break;
2110 ctx->pos++;
640708a2 2111 }
f0c3b509
AV		 2112 if (fa)
2113 flex_array_free(fa);
2114 mmput(mm);
640708a2 2115
640708a2
PE		 2116out_put_task:
2117 put_task_struct(task);
2118out:
2119 return ret;
2120}
2121
2122static const struct file_operations proc_map_files_operations = {
2123 .read = generic_read_dir,
f50752ea
AV		 2124 .iterate_shared = proc_map_files_readdir,
2125 .llseek = generic_file_llseek,
640708a2
PE		 2126};
2127
b5946bea 2128#ifdef CONFIG_CHECKPOINT_RESTORE
48f6a7a5
PE		 2129struct timers_private {
2130 struct pid *pid;
2131 struct task_struct *task;
2132 struct sighand_struct *sighand;
57b8015e 2133 struct pid_namespace *ns;
48f6a7a5
PE		 2134 unsigned long flags;
2135};
2136
2137static void *timers_start(struct seq_file *m, loff_t *pos)
2138{
2139 struct timers_private *tp = m->private;
2140
2141 tp->task = get_pid_task(tp->pid, PIDTYPE_PID);
2142 if (!tp->task)
2143 return ERR_PTR(-ESRCH);
2144
2145 tp->sighand = lock_task_sighand(tp->task, &tp->flags);
2146 if (!tp->sighand)
2147 return ERR_PTR(-ESRCH);
2148
2149 return seq_list_start(&tp->task->signal->posix_timers, *pos);
2150}
2151
2152static void *timers_next(struct seq_file *m, void *v, loff_t *pos)
2153{
2154 struct timers_private *tp = m->private;
2155 return seq_list_next(v, &tp->task->signal->posix_timers, pos);
2156}
2157
2158static void timers_stop(struct seq_file *m, void *v)
2159{
2160 struct timers_private *tp = m->private;
2161
2162 if (tp->sighand) {
2163 unlock_task_sighand(tp->task, &tp->flags);
2164 tp->sighand = NULL;
2165 }
2166
2167 if (tp->task) {
2168 put_task_struct(tp->task);
2169 tp->task = NULL;
2170 }
2171}
2172
2173static int show_timer(struct seq_file *m, void *v)
2174{
2175 struct k_itimer *timer;
57b8015e
PE		 2176 struct timers_private *tp = m->private;
2177 int notify;
cedbccab 2178 static const char * const nstr[] = {
57b8015e
PE		 2179 [SIGEV_SIGNAL] = "signal",
2180 [SIGEV_NONE] = "none",
2181 [SIGEV_THREAD] = "thread",
2182 };
48f6a7a5
PE		 2183
2184 timer = list_entry((struct list_head *)v, struct k_itimer, list);
57b8015e
PE		 2185 notify = timer->it_sigev_notify;
2186
48f6a7a5 2187 seq_printf(m, "ID: %d\n", timer->it_id);
25ce3191
JP		 2188 seq_printf(m, "signal: %d/%p\n",
2189 timer->sigq->info.si_signo,
2190 timer->sigq->info.si_value.sival_ptr);
57b8015e 2191 seq_printf(m, "notify: %s/%s.%d\n",
25ce3191
JP		 2192 nstr[notify & ~SIGEV_THREAD_ID],
2193 (notify & SIGEV_THREAD_ID) ? "tid" : "pid",
2194 pid_nr_ns(timer->it_pid, tp->ns));
15ef0298 2195 seq_printf(m, "ClockID: %d\n", timer->it_clock);
48f6a7a5
PE		 2196
2197 return 0;
2198}
2199
2200static const struct seq_operations proc_timers_seq_ops = {
2201 .start = timers_start,
2202 .next = timers_next,
2203 .stop = timers_stop,
2204 .show = show_timer,
2205};
2206
2207static int proc_timers_open(struct inode *inode, struct file *file)
2208{
2209 struct timers_private *tp;
2210
2211 tp = __seq_open_private(file, &proc_timers_seq_ops,
2212 sizeof(struct timers_private));
2213 if (!tp)
2214 return -ENOMEM;
2215
2216 tp->pid = proc_pid(inode);
57b8015e 2217 tp->ns = inode->i_sb->s_fs_info;
48f6a7a5
PE		 2218 return 0;
2219}
2220
2221static const struct file_operations proc_timers_operations = {
2222 .open = proc_timers_open,
2223 .read = seq_read,
2224 .llseek = seq_lseek,
2225 .release = seq_release_private,
2226};
b5946bea 2227#endif
640708a2 2228
5de23d43
JS		 2229static ssize_t timerslack_ns_write(struct file *file, const char __user *buf,
2230 size_t count, loff_t *offset)
2231{
2232 struct inode *inode = file_inode(file);
2233 struct task_struct *p;
2234 u64 slack_ns;
2235 int err;
2236
2237 err = kstrtoull_from_user(buf, count, 10, &slack_ns);
2238 if (err < 0)
2239 return err;
2240
2241 p = get_proc_task(inode);
2242 if (!p)
2243 return -ESRCH;
2244
2245 if (ptrace_may_access(p, PTRACE_MODE_ATTACH_FSCREDS)) {
2246 task_lock(p);
2247 if (slack_ns == 0)
2248 p->timer_slack_ns = p->default_timer_slack_ns;
2249 else
2250 p->timer_slack_ns = slack_ns;
2251 task_unlock(p);
2252 } else
2253 count = -EPERM;
2254
2255 put_task_struct(p);
2256
2257 return count;
2258}
2259
2260static int timerslack_ns_show(struct seq_file *m, void *v)
2261{
2262 struct inode *inode = m->private;
2263 struct task_struct *p;
2264 int err = 0;
2265
2266 p = get_proc_task(inode);
2267 if (!p)
2268 return -ESRCH;
2269
2270 if (ptrace_may_access(p, PTRACE_MODE_ATTACH_FSCREDS)) {
2271 task_lock(p);
2272 seq_printf(m, "%llu\n", p->timer_slack_ns);
2273 task_unlock(p);
2274 } else
2275 err = -EPERM;
2276
2277 put_task_struct(p);
2278
2279 return err;
2280}
2281
2282static int timerslack_ns_open(struct inode *inode, struct file *filp)
2283{
2284 return single_open(filp, timerslack_ns_show, inode);
2285}
2286
2287static const struct file_operations proc_pid_set_timerslack_ns_operations = {
2288 .open = timerslack_ns_open,
2289 .read = seq_read,
2290 .write = timerslack_ns_write,
2291 .llseek = seq_lseek,
2292 .release = single_release,
2293};
2294
c52a47ac 2295static int proc_pident_instantiate(struct inode *dir,
c5141e6d 2296 struct dentry *dentry, struct task_struct *task, const void *ptr)
444ceed8 2297{
c5141e6d 2298 const struct pid_entry *p = ptr;
444ceed8
EB		 2299 struct inode *inode;
2300 struct proc_inode *ei;
444ceed8 2301
61a28784 2302 inode = proc_pid_make_inode(dir->i_sb, task);
444ceed8
EB		 2303 if (!inode)
2304 goto out;
2305
2306 ei = PROC_I(inode);
2307 inode->i_mode = p->mode;
2308 if (S_ISDIR(inode->i_mode))
bfe86848 2309 set_nlink(inode, 2); /* Use getattr to fix if necessary */
444ceed8
EB		 2310 if (p->iop)
2311 inode->i_op = p->iop;
2312 if (p->fop)
2313 inode->i_fop = p->fop;
2314 ei->op = p->op;
fb045adb 2315 d_set_d_op(dentry, &pid_dentry_operations);
444ceed8
EB		 2316 d_add(dentry, inode);
2317 /* Close the race of the process dying before we return the dentry */
0b728e19 2318 if (pid_revalidate(dentry, 0))
c52a47ac 2319 return 0;
444ceed8 2320out:
c52a47ac 2321 return -ENOENT;
444ceed8
EB		 2322}
2323
1da177e4
LT		 2324static struct dentry *proc_pident_lookup(struct inode *dir,
2325 struct dentry *dentry,
c5141e6d 2326 const struct pid_entry *ents,
7bcd6b0e 2327 unsigned int nents)
1da177e4 2328{
c52a47ac 2329 int error;
99f89551 2330 struct task_struct *task = get_proc_task(dir);
c5141e6d 2331 const struct pid_entry *p, *last;
1da177e4 2332
c52a47ac 2333 error = -ENOENT;
1da177e4 2334
99f89551
EB		 2335 if (!task)
2336 goto out_no_task;
1da177e4 2337
20cdc894
EB		 2338 /*
2339 * Yes, it does not scale. And it should not. Don't add
2340 * new entries into /proc/<tgid>/ without very good reasons.
2341 */
7bcd6b0e
EB		 2342 last = &ents[nents - 1];
2343 for (p = ents; p <= last; p++) {
1da177e4
LT		 2344 if (p->len != dentry->d_name.len)
2345 continue;
2346 if (!memcmp(dentry->d_name.name, p->name, p->len))
2347 break;
2348 }
7bcd6b0e 2349 if (p > last)
1da177e4
LT		 2350 goto out;
2351
444ceed8 2352 error = proc_pident_instantiate(dir, dentry, task, p);
1da177e4 2353out:
99f89551
EB		 2354 put_task_struct(task);
2355out_no_task:
c52a47ac 2356 return ERR_PTR(error);
1da177e4
LT		 2357}
2358
f0c3b509 2359static int proc_pident_readdir(struct file *file, struct dir_context *ctx,
c5141e6d 2360 const struct pid_entry *ents, unsigned int nents)
28a6d671 2361{
f0c3b509
AV		 2362 struct task_struct *task = get_proc_task(file_inode(file));
2363 const struct pid_entry *p;
28a6d671 2364
28a6d671 2365 if (!task)
f0c3b509 2366 return -ENOENT;
28a6d671 2367
f0c3b509
AV		 2368 if (!dir_emit_dots(file, ctx))
2369 goto out;
2370
2371 if (ctx->pos >= nents + 2)
2372 goto out;
28a6d671 2373
f0c3b509
AV		 2374 for (p = ents + (ctx->pos - 2); p <= ents + nents - 1; p++) {
2375 if (!proc_fill_cache(file, ctx, p->name, p->len,
2376 proc_pident_instantiate, task, p))
2377 break;
2378 ctx->pos++;
2379 }
28a6d671 2380out:
61a28784 2381 put_task_struct(task);
f0c3b509 2382 return 0;
1da177e4
LT		 2383}
2384
28a6d671
EB		 2385#ifdef CONFIG_SECURITY
2386static ssize_t proc_pid_attr_read(struct file * file, char __user * buf,
2387 size_t count, loff_t *ppos)
2388{
496ad9aa 2389 struct inode * inode = file_inode(file);
04ff9708 2390 char *p = NULL;
28a6d671
EB		 2391 ssize_t length;
2392 struct task_struct *task = get_proc_task(inode);
2393
28a6d671 2394 if (!task)
04ff9708 2395 return -ESRCH;
28a6d671
EB		 2396
2397 length = security_getprocattr(task,
2fddfeef 2398 (char*)file->f_path.dentry->d_name.name,
04ff9708 2399 &p);
28a6d671 2400 put_task_struct(task);
04ff9708
AV		 2401 if (length > 0)
2402 length = simple_read_from_buffer(buf, count, ppos, p, length);
2403 kfree(p);
28a6d671 2404 return length;
1da177e4
LT		 2405}
2406
28a6d671
EB		 2407static ssize_t proc_pid_attr_write(struct file * file, const char __user * buf,
2408 size_t count, loff_t *ppos)
2409{
496ad9aa 2410 struct inode * inode = file_inode(file);
bb646cdb 2411 void *page;
28a6d671
EB		 2412 ssize_t length;
2413 struct task_struct *task = get_proc_task(inode);
2414
2415 length = -ESRCH;
2416 if (!task)
2417 goto out_no_task;
2418 if (count > PAGE_SIZE)
2419 count = PAGE_SIZE;
2420
2421 /* No partial writes. */
2422 length = -EINVAL;
2423 if (*ppos != 0)
2424 goto out;
2425
bb646cdb
AV		 2426 page = memdup_user(buf, count);
2427 if (IS_ERR(page)) {
2428 length = PTR_ERR(page);
28a6d671 2429 goto out;
bb646cdb 2430 }
28a6d671 2431
107db7c7 2432 /* Guard against adverse ptrace interaction */
9b1bf12d 2433 length = mutex_lock_interruptible(&task->signal->cred_guard_mutex);
107db7c7
DH		 2434 if (length < 0)
2435 goto out_free;
2436
28a6d671 2437 length = security_setprocattr(task,
2fddfeef 2438 (char*)file->f_path.dentry->d_name.name,
bb646cdb 2439 page, count);
9b1bf12d 2440 mutex_unlock(&task->signal->cred_guard_mutex);
28a6d671 2441out_free:
bb646cdb 2442 kfree(page);
28a6d671
EB		 2443out:
2444 put_task_struct(task);
2445out_no_task:
2446 return length;
2447}
2448
00977a59 2449static const struct file_operations proc_pid_attr_operations = {
28a6d671
EB		 2450 .read = proc_pid_attr_read,
2451 .write = proc_pid_attr_write,
87df8424 2452 .llseek = generic_file_llseek,
28a6d671
EB		 2453};
2454
c5141e6d 2455static const struct pid_entry attr_dir_stuff[] = {
631f9c18
AD		 2456 REG("current", S_IRUGO|S_IWUGO, proc_pid_attr_operations),
2457 REG("prev", S_IRUGO, proc_pid_attr_operations),
2458 REG("exec", S_IRUGO|S_IWUGO, proc_pid_attr_operations),
2459 REG("fscreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations),
2460 REG("keycreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations),
2461 REG("sockcreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations),
28a6d671
EB		 2462};
2463
f0c3b509 2464static int proc_attr_dir_readdir(struct file *file, struct dir_context *ctx)
28a6d671 2465{
f0c3b509
AV		 2466 return proc_pident_readdir(file, ctx,
2467 attr_dir_stuff, ARRAY_SIZE(attr_dir_stuff));
28a6d671
EB		 2468}
2469
00977a59 2470static const struct file_operations proc_attr_dir_operations = {
1da177e4 2471 .read = generic_read_dir,
f50752ea
AV		 2472 .iterate_shared = proc_attr_dir_readdir,
2473 .llseek = generic_file_llseek,
1da177e4
LT		 2474};
2475
72d9dcfc 2476static struct dentry *proc_attr_dir_lookup(struct inode *dir,
00cd8dd3 2477 struct dentry *dentry, unsigned int flags)
28a6d671 2478{
7bcd6b0e
EB		 2479 return proc_pident_lookup(dir, dentry,
2480 attr_dir_stuff, ARRAY_SIZE(attr_dir_stuff));
28a6d671
EB		 2481}
2482
c5ef1c42 2483static const struct inode_operations proc_attr_dir_inode_operations = {
72d9dcfc 2484 .lookup = proc_attr_dir_lookup,
99f89551 2485 .getattr = pid_getattr,
6d76fa58 2486 .setattr = proc_setattr,
1da177e4
LT		 2487};
2488
28a6d671
EB		 2489#endif
2490
698ba7b5 2491#ifdef CONFIG_ELF_CORE
3cb4a0bb
KH		 2492static ssize_t proc_coredump_filter_read(struct file *file, char __user *buf,
2493 size_t count, loff_t *ppos)
2494{
496ad9aa 2495 struct task_struct *task = get_proc_task(file_inode(file));
3cb4a0bb
KH		 2496 struct mm_struct *mm;
2497 char buffer[PROC_NUMBUF];
2498 size_t len;
2499 int ret;
2500
2501 if (!task)
2502 return -ESRCH;
2503
2504 ret = 0;
2505 mm = get_task_mm(task);
2506 if (mm) {
2507 len = snprintf(buffer, sizeof(buffer), "%08lx\n",
2508 ((mm->flags & MMF_DUMP_FILTER_MASK) >>
2509 MMF_DUMP_FILTER_SHIFT));
2510 mmput(mm);
2511 ret = simple_read_from_buffer(buf, count, ppos, buffer, len);
2512 }
2513
2514 put_task_struct(task);
2515
2516 return ret;
2517}
2518
2519static ssize_t proc_coredump_filter_write(struct file *file,
2520 const char __user *buf,
2521 size_t count,
2522 loff_t *ppos)
2523{
2524 struct task_struct *task;
2525 struct mm_struct *mm;
3cb4a0bb
KH		 2526 unsigned int val;
2527 int ret;
2528 int i;
2529 unsigned long mask;
2530
774636e1
AD		 2531 ret = kstrtouint_from_user(buf, count, 0, &val);
2532 if (ret < 0)
2533 return ret;
3cb4a0bb
KH		 2534
2535 ret = -ESRCH;
496ad9aa 2536 task = get_proc_task(file_inode(file));
3cb4a0bb
KH		 2537 if (!task)
2538 goto out_no_task;
2539
3cb4a0bb
KH		 2540 mm = get_task_mm(task);
2541 if (!mm)
2542 goto out_no_mm;
41a0c249 2543 ret = 0;
3cb4a0bb
KH		 2544
2545 for (i = 0, mask = 1; i < MMF_DUMP_FILTER_BITS; i++, mask <<= 1) {
2546 if (val & mask)
2547 set_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags);
2548 else
2549 clear_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags);
2550 }
2551
2552 mmput(mm);
2553 out_no_mm:
2554 put_task_struct(task);
2555 out_no_task:
774636e1
AD		 2556 if (ret < 0)
2557 return ret;
2558 return count;
3cb4a0bb
KH		 2559}
2560
2561static const struct file_operations proc_coredump_filter_operations = {
2562 .read = proc_coredump_filter_read,
2563 .write = proc_coredump_filter_write,
87df8424 2564 .llseek = generic_file_llseek,
3cb4a0bb
KH		 2565};
2566#endif
2567
aba76fdb 2568#ifdef CONFIG_TASK_IO_ACCOUNTING
19aadc98 2569static int do_io_accounting(struct task_struct *task, struct seq_file *m, int whole)
297c5d92 2570{
940389b8 2571 struct task_io_accounting acct = task->ioac;
5995477a 2572 unsigned long flags;
293eb1e7 2573 int result;
5995477a 2574
293eb1e7
VK		 2575 result = mutex_lock_killable(&task->signal->cred_guard_mutex);
2576 if (result)
2577 return result;
2578
caaee623 2579 if (!ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS)) {
293eb1e7
VK		 2580 result = -EACCES;
2581 goto out_unlock;
2582 }
1d1221f3 2583
5995477a
AR		 2584 if (whole && lock_task_sighand(task, &flags)) {
2585 struct task_struct *t = task;
2586
2587 task_io_accounting_add(&acct, &task->signal->ioac);
2588 while_each_thread(task, t)
2589 task_io_accounting_add(&acct, &t->ioac);
2590
2591 unlock_task_sighand(task, &flags);
297c5d92 2592 }
25ce3191
JP		 2593 seq_printf(m,
2594 "rchar: %llu\n"
2595 "wchar: %llu\n"
2596 "syscr: %llu\n"
2597 "syscw: %llu\n"
2598 "read_bytes: %llu\n"
2599 "write_bytes: %llu\n"
2600 "cancelled_write_bytes: %llu\n",
2601 (unsigned long long)acct.rchar,
2602 (unsigned long long)acct.wchar,
2603 (unsigned long long)acct.syscr,
2604 (unsigned long long)acct.syscw,
2605 (unsigned long long)acct.read_bytes,
2606 (unsigned long long)acct.write_bytes,
2607 (unsigned long long)acct.cancelled_write_bytes);
2608 result = 0;
2609
293eb1e7
VK		 2610out_unlock:
2611 mutex_unlock(&task->signal->cred_guard_mutex);
2612 return result;
297c5d92
AR		 2613}
2614
19aadc98
AD		 2615static int proc_tid_io_accounting(struct seq_file *m, struct pid_namespace *ns,
2616 struct pid *pid, struct task_struct *task)
297c5d92 2617{
19aadc98 2618 return do_io_accounting(task, m, 0);
aba76fdb 2619}
297c5d92 2620
19aadc98
AD		 2621static int proc_tgid_io_accounting(struct seq_file *m, struct pid_namespace *ns,
2622 struct pid *pid, struct task_struct *task)
297c5d92 2623{
19aadc98 2624 return do_io_accounting(task, m, 1);
297c5d92
AR		 2625}
2626#endif /* CONFIG_TASK_IO_ACCOUNTING */
aba76fdb 2627
22d917d8
EB		 2628#ifdef CONFIG_USER_NS
2629static int proc_id_map_open(struct inode *inode, struct file *file,
ccf94f1b 2630 const struct seq_operations *seq_ops)
22d917d8
EB		 2631{
2632 struct user_namespace *ns = NULL;
2633 struct task_struct *task;
2634 struct seq_file *seq;
2635 int ret = -EINVAL;
2636
2637 task = get_proc_task(inode);
2638 if (task) {
2639 rcu_read_lock();
2640 ns = get_user_ns(task_cred_xxx(task, user_ns));
2641 rcu_read_unlock();
2642 put_task_struct(task);
2643 }
2644 if (!ns)
2645 goto err;
2646
2647 ret = seq_open(file, seq_ops);
2648 if (ret)
2649 goto err_put_ns;
2650
2651 seq = file->private_data;
2652 seq->private = ns;
2653
2654 return 0;
2655err_put_ns:
2656 put_user_ns(ns);
2657err:
2658 return ret;
2659}
2660
2661static int proc_id_map_release(struct inode *inode, struct file *file)
2662{
2663 struct seq_file *seq = file->private_data;
2664 struct user_namespace *ns = seq->private;
2665 put_user_ns(ns);
2666 return seq_release(inode, file);
2667}
2668
2669static int proc_uid_map_open(struct inode *inode, struct file *file)
2670{
2671 return proc_id_map_open(inode, file, &proc_uid_seq_operations);
2672}
2673
2674static int proc_gid_map_open(struct inode *inode, struct file *file)
2675{
2676 return proc_id_map_open(inode, file, &proc_gid_seq_operations);
2677}
2678
f76d207a
EB		 2679static int proc_projid_map_open(struct inode *inode, struct file *file)
2680{
2681 return proc_id_map_open(inode, file, &proc_projid_seq_operations);
2682}
2683
22d917d8
EB		 2684static const struct file_operations proc_uid_map_operations = {
2685 .open = proc_uid_map_open,
2686 .write = proc_uid_map_write,
2687 .read = seq_read,
2688 .llseek = seq_lseek,
2689 .release = proc_id_map_release,
2690};
2691
2692static const struct file_operations proc_gid_map_operations = {
2693 .open = proc_gid_map_open,
2694 .write = proc_gid_map_write,
2695 .read = seq_read,
2696 .llseek = seq_lseek,
2697 .release = proc_id_map_release,
2698};
f76d207a
EB		 2699
2700static const struct file_operations proc_projid_map_operations = {
2701 .open = proc_projid_map_open,
2702 .write = proc_projid_map_write,
2703 .read = seq_read,
2704 .llseek = seq_lseek,
2705 .release = proc_id_map_release,
2706};
9cc46516
EB		 2707
2708static int proc_setgroups_open(struct inode *inode, struct file *file)
2709{
2710 struct user_namespace *ns = NULL;
2711 struct task_struct *task;
2712 int ret;
2713
2714 ret = -ESRCH;
2715 task = get_proc_task(inode);
2716 if (task) {
2717 rcu_read_lock();
2718 ns = get_user_ns(task_cred_xxx(task, user_ns));
2719 rcu_read_unlock();
2720 put_task_struct(task);
2721 }
2722 if (!ns)
2723 goto err;
2724
2725 if (file->f_mode & FMODE_WRITE) {
2726 ret = -EACCES;
2727 if (!ns_capable(ns, CAP_SYS_ADMIN))
2728 goto err_put_ns;
2729 }
2730
2731 ret = single_open(file, &proc_setgroups_show, ns);
2732 if (ret)
2733 goto err_put_ns;
2734
2735 return 0;
2736err_put_ns:
2737 put_user_ns(ns);
2738err:
2739 return ret;
2740}
2741
2742static int proc_setgroups_release(struct inode *inode, struct file *file)
2743{
2744 struct seq_file *seq = file->private_data;
2745 struct user_namespace *ns = seq->private;
2746 int ret = single_release(inode, file);
2747 put_user_ns(ns);
2748 return ret;
2749}
2750
2751static const struct file_operations proc_setgroups_operations = {
2752 .open = proc_setgroups_open,
2753 .write = proc_setgroups_write,
2754 .read = seq_read,
2755 .llseek = seq_lseek,
2756 .release = proc_setgroups_release,
2757};
22d917d8
EB		 2758#endif /* CONFIG_USER_NS */
2759
47830723
KC		 2760static int proc_pid_personality(struct seq_file *m, struct pid_namespace *ns,
2761 struct pid *pid, struct task_struct *task)
2762{
a9712bc1
AV		 2763 int err = lock_trace(task);
2764 if (!err) {
2765 seq_printf(m, "%08x\n", task->personality);
2766 unlock_trace(task);
2767 }
2768 return err;
47830723
KC		 2769}
2770
28a6d671
EB		 2771/*
2772 * Thread groups
2773 */
00977a59 2774static const struct file_operations proc_task_operations;
c5ef1c42 2775static const struct inode_operations proc_task_inode_operations;
20cdc894 2776
c5141e6d 2777static const struct pid_entry tgid_base_stuff[] = {
631f9c18
AD		 2778 DIR("task", S_IRUGO|S_IXUGO, proc_task_inode_operations, proc_task_operations),
2779 DIR("fd", S_IRUSR|S_IXUSR, proc_fd_inode_operations, proc_fd_operations),
640708a2 2780 DIR("map_files", S_IRUSR|S_IXUSR, proc_map_files_inode_operations, proc_map_files_operations),
631f9c18 2781 DIR("fdinfo", S_IRUSR|S_IXUSR, proc_fdinfo_inode_operations, proc_fdinfo_operations),
6b4e306a 2782 DIR("ns", S_IRUSR|S_IXUGO, proc_ns_dir_inode_operations, proc_ns_dir_operations),
b2211a36 2783#ifdef CONFIG_NET
631f9c18 2784 DIR("net", S_IRUGO|S_IXUGO, proc_net_inode_operations, proc_net_operations),
b2211a36 2785#endif
631f9c18 2786 REG("environ", S_IRUSR, proc_environ_operations),
f9ea536e 2787 ONE("auxv", S_IRUSR, proc_pid_auxv),
631f9c18 2788 ONE("status", S_IRUGO, proc_pid_status),
35a35046 2789 ONE("personality", S_IRUSR, proc_pid_personality),
1c963eb1 2790 ONE("limits", S_IRUGO, proc_pid_limits),
43ae34cb 2791#ifdef CONFIG_SCHED_DEBUG
631f9c18 2792 REG("sched", S_IRUGO|S_IWUSR, proc_pid_sched_operations),
5091faa4
MG		 2793#endif
2794#ifdef CONFIG_SCHED_AUTOGROUP
2795 REG("autogroup", S_IRUGO|S_IWUSR, proc_pid_sched_autogroup_operations),
ebcb6734 2796#endif
4614a696 2797 REG("comm", S_IRUGO|S_IWUSR, proc_pid_set_comm_operations),
ebcb6734 2798#ifdef CONFIG_HAVE_ARCH_TRACEHOOK
09d93bd6 2799 ONE("syscall", S_IRUSR, proc_pid_syscall),
43ae34cb 2800#endif
c2c0bb44 2801 REG("cmdline", S_IRUGO, proc_pid_cmdline_ops),
631f9c18
AD		 2802 ONE("stat", S_IRUGO, proc_tgid_stat),
2803 ONE("statm", S_IRUGO, proc_pid_statm),
b7643757 2804 REG("maps", S_IRUGO, proc_pid_maps_operations),
28a6d671 2805#ifdef CONFIG_NUMA
b7643757 2806 REG("numa_maps", S_IRUGO, proc_pid_numa_maps_operations),
28a6d671 2807#endif
631f9c18
AD		 2808 REG("mem", S_IRUSR|S_IWUSR, proc_mem_operations),
2809 LNK("cwd", proc_cwd_link),
2810 LNK("root", proc_root_link),
2811 LNK("exe", proc_exe_link),
2812 REG("mounts", S_IRUGO, proc_mounts_operations),
2813 REG("mountinfo", S_IRUGO, proc_mountinfo_operations),
2814 REG("mountstats", S_IRUSR, proc_mountstats_operations),
1e883281 2815#ifdef CONFIG_PROC_PAGE_MONITOR
631f9c18 2816 REG("clear_refs", S_IWUSR, proc_clear_refs_operations),
b7643757 2817 REG("smaps", S_IRUGO, proc_pid_smaps_operations),
32ed74a4 2818 REG("pagemap", S_IRUSR, proc_pagemap_operations),
28a6d671
EB		 2819#endif
2820#ifdef CONFIG_SECURITY
631f9c18 2821 DIR("attr", S_IRUGO|S_IXUGO, proc_attr_dir_inode_operations, proc_attr_dir_operations),
28a6d671
EB		 2822#endif
2823#ifdef CONFIG_KALLSYMS
edfcd606 2824 ONE("wchan", S_IRUGO, proc_pid_wchan),
28a6d671 2825#endif
2ec220e2 2826#ifdef CONFIG_STACKTRACE
35a35046 2827 ONE("stack", S_IRUSR, proc_pid_stack),
28a6d671 2828#endif
5968cece 2829#ifdef CONFIG_SCHED_INFO
f6e826ca 2830 ONE("schedstat", S_IRUGO, proc_pid_schedstat),
28a6d671 2831#endif
9745512c 2832#ifdef CONFIG_LATENCYTOP
631f9c18 2833 REG("latency", S_IRUGO, proc_lstats_operations),
9745512c 2834#endif
8793d854 2835#ifdef CONFIG_PROC_PID_CPUSET
52de4779 2836 ONE("cpuset", S_IRUGO, proc_cpuset_show),
a424316c
PM		 2837#endif
2838#ifdef CONFIG_CGROUPS
006f4ac4 2839 ONE("cgroup", S_IRUGO, proc_cgroup_show),
28a6d671 2840#endif
6ba51e37 2841 ONE("oom_score", S_IRUGO, proc_oom_score),
fa0cbbf1 2842 REG("oom_adj", S_IRUGO|S_IWUSR, proc_oom_adj_operations),
a63d83f4 2843 REG("oom_score_adj", S_IRUGO|S_IWUSR, proc_oom_score_adj_operations),
28a6d671 2844#ifdef CONFIG_AUDITSYSCALL
631f9c18
AD		 2845 REG("loginuid", S_IWUSR|S_IRUGO, proc_loginuid_operations),
2846 REG("sessionid", S_IRUGO, proc_sessionid_operations),
28a6d671 2847#endif
f4f154fd 2848#ifdef CONFIG_FAULT_INJECTION
631f9c18 2849 REG("make-it-fail", S_IRUGO|S_IWUSR, proc_fault_inject_operations),
f4f154fd 2850#endif
698ba7b5 2851#ifdef CONFIG_ELF_CORE
631f9c18 2852 REG("coredump_filter", S_IRUGO|S_IWUSR, proc_coredump_filter_operations),
3cb4a0bb 2853#endif
aba76fdb 2854#ifdef CONFIG_TASK_IO_ACCOUNTING
19aadc98 2855 ONE("io", S_IRUSR, proc_tgid_io_accounting),
aba76fdb 2856#endif
f133ecca 2857#ifdef CONFIG_HARDWALL
d962c144 2858 ONE("hardwall", S_IRUGO, proc_pid_hardwall),
f133ecca 2859#endif
22d917d8
EB		 2860#ifdef CONFIG_USER_NS
2861 REG("uid_map", S_IRUGO|S_IWUSR, proc_uid_map_operations),
2862 REG("gid_map", S_IRUGO|S_IWUSR, proc_gid_map_operations),
f76d207a 2863 REG("projid_map", S_IRUGO|S_IWUSR, proc_projid_map_operations),
9cc46516 2864 REG("setgroups", S_IRUGO|S_IWUSR, proc_setgroups_operations),
22d917d8 2865#endif
48f6a7a5
PE		 2866#ifdef CONFIG_CHECKPOINT_RESTORE
2867 REG("timers", S_IRUGO, proc_timers_operations),
2868#endif
5de23d43 2869 REG("timerslack_ns", S_IRUGO|S_IWUGO, proc_pid_set_timerslack_ns_operations),
28a6d671 2870};
1da177e4 2871
f0c3b509 2872static int proc_tgid_base_readdir(struct file *file, struct dir_context *ctx)
1da177e4 2873{
f0c3b509
AV		 2874 return proc_pident_readdir(file, ctx,
2875 tgid_base_stuff, ARRAY_SIZE(tgid_base_stuff));
1da177e4
LT		 2876}
2877
00977a59 2878static const struct file_operations proc_tgid_base_operations = {
1da177e4 2879 .read = generic_read_dir,
f50752ea
AV		 2880 .iterate_shared = proc_tgid_base_readdir,
2881 .llseek = generic_file_llseek,
1da177e4
LT		 2882};
2883
00cd8dd3
AV		 2884static struct dentry *proc_tgid_base_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags)
2885{
7bcd6b0e
EB		 2886 return proc_pident_lookup(dir, dentry,
2887 tgid_base_stuff, ARRAY_SIZE(tgid_base_stuff));
1da177e4
LT		 2888}
2889
c5ef1c42 2890static const struct inode_operations proc_tgid_base_inode_operations = {
28a6d671 2891 .lookup = proc_tgid_base_lookup,
99f89551 2892 .getattr = pid_getattr,
6d76fa58 2893 .setattr = proc_setattr,
0499680a 2894 .permission = proc_pid_permission,
1da177e4 2895};
1da177e4 2896
60347f67 2897static void proc_flush_task_mnt(struct vfsmount *mnt, pid_t pid, pid_t tgid)
1da177e4 2898{
48e6484d 2899 struct dentry *dentry, *leader, *dir;
8578cea7 2900 char buf[PROC_NUMBUF];
48e6484d
EB		 2901 struct qstr name;
2902
2903 name.name = buf;
60347f67 2904 name.len = snprintf(buf, sizeof(buf), "%d", pid);
4f522a24 2905 /* no ->d_hash() rejects on procfs */
60347f67 2906 dentry = d_hash_and_lookup(mnt->mnt_root, &name);
48e6484d 2907 if (dentry) {
bbd51924 2908 d_invalidate(dentry);
48e6484d
EB		 2909 dput(dentry);
2910 }
1da177e4 2911
c35a7f18
ON		 2912 if (pid == tgid)
2913 return;
2914
48e6484d 2915 name.name = buf;
60347f67
PE		 2916 name.len = snprintf(buf, sizeof(buf), "%d", tgid);
2917 leader = d_hash_and_lookup(mnt->mnt_root, &name);
48e6484d
EB		 2918 if (!leader)
2919 goto out;
1da177e4 2920
48e6484d
EB		 2921 name.name = "task";
2922 name.len = strlen(name.name);
2923 dir = d_hash_and_lookup(leader, &name);
2924 if (!dir)
2925 goto out_put_leader;
2926
2927 name.name = buf;
60347f67 2928 name.len = snprintf(buf, sizeof(buf), "%d", pid);
48e6484d
EB		 2929 dentry = d_hash_and_lookup(dir, &name);
2930 if (dentry) {
bbd51924 2931 d_invalidate(dentry);
48e6484d 2932 dput(dentry);
1da177e4 2933 }
48e6484d
EB		 2934
2935 dput(dir);
2936out_put_leader:
2937 dput(leader);
2938out:
2939 return;
1da177e4
LT		 2940}
2941
0895e91d
RD		 2942/**
2943 * proc_flush_task - Remove dcache entries for @task from the /proc dcache.
2944 * @task: task that should be flushed.
2945 *
2946 * When flushing dentries from proc, one needs to flush them from global
60347f67 2947 * proc (proc_mnt) and from all the namespaces' procs this task was seen
0895e91d
RD		 2948 * in. This call is supposed to do all of this job.
2949 *
2950 * Looks in the dcache for
2951 * /proc/@pid
2952 * /proc/@tgid/task/@pid
2953 * if either directory is present flushes it and all of it'ts children
2954 * from the dcache.
2955 *
2956 * It is safe and reasonable to cache /proc entries for a task until
2957 * that task exits. After that they just clog up the dcache with
2958 * useless entries, possibly causing useful dcache entries to be
2959 * flushed instead. This routine is proved to flush those useless
2960 * dcache entries at process exit time.
2961 *
2962 * NOTE: This routine is just an optimization so it does not guarantee
2963 * that no dcache entries will exist at process exit time it
2964 * just makes it very unlikely that any will persist.
60347f67
PE		 2965 */
2966
2967void proc_flush_task(struct task_struct *task)
2968{
9fcc2d15 2969 int i;
9b4d1cbe 2970 struct pid *pid, *tgid;
130f77ec
PE		 2971 struct upid *upid;
2972
130f77ec 2973 pid = task_pid(task);
9b4d1cbe 2974 tgid = task_tgid(task);
130f77ec 2975
9fcc2d15 2976 for (i = 0; i <= pid->level; i++) {
130f77ec
PE		 2977 upid = &pid->numbers[i];
2978 proc_flush_task_mnt(upid->ns->proc_mnt, upid->nr,
9b4d1cbe 2979 tgid->numbers[i].nr);
130f77ec 2980 }
60347f67
PE		 2981}
2982
c52a47ac
AV		 2983static int proc_pid_instantiate(struct inode *dir,
2984 struct dentry * dentry,
2985 struct task_struct *task, const void *ptr)
444ceed8 2986{
444ceed8
EB		 2987 struct inode *inode;
2988
61a28784 2989 inode = proc_pid_make_inode(dir->i_sb, task);
444ceed8
EB		 2990 if (!inode)
2991 goto out;
2992
2993 inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO;
2994 inode->i_op = &proc_tgid_base_inode_operations;
2995 inode->i_fop = &proc_tgid_base_operations;
2996 inode->i_flags|=S_IMMUTABLE;
aed54175 2997
bfe86848
MS		 2998 set_nlink(inode, 2 + pid_entry_count_dirs(tgid_base_stuff,
2999 ARRAY_SIZE(tgid_base_stuff)));
444ceed8 3000
fb045adb 3001 d_set_d_op(dentry, &pid_dentry_operations);
444ceed8
EB		 3002
3003 d_add(dentry, inode);
3004 /* Close the race of the process dying before we return the dentry */
0b728e19 3005 if (pid_revalidate(dentry, 0))
c52a47ac 3006 return 0;
444ceed8 3007out:
c52a47ac 3008 return -ENOENT;
444ceed8
EB		 3009}
3010
00cd8dd3 3011struct dentry *proc_pid_lookup(struct inode *dir, struct dentry * dentry, unsigned int flags)
1da177e4 3012{
335eb531 3013 int result = -ENOENT;
1da177e4 3014 struct task_struct *task;
1da177e4 3015 unsigned tgid;
b488893a 3016 struct pid_namespace *ns;
1da177e4 3017
dbcdb504 3018 tgid = name_to_int(&dentry->d_name);
1da177e4
LT		 3019 if (tgid == ~0U)
3020 goto out;
3021
b488893a 3022 ns = dentry->d_sb->s_fs_info;
de758734 3023 rcu_read_lock();
b488893a 3024 task = find_task_by_pid_ns(tgid, ns);
1da177e4
LT		 3025 if (task)
3026 get_task_struct(task);
de758734 3027 rcu_read_unlock();
1da177e4
LT		 3028 if (!task)
3029 goto out;
3030
444ceed8 3031 result = proc_pid_instantiate(dir, dentry, task, NULL);
1da177e4 3032 put_task_struct(task);
1da177e4 3033out:
c52a47ac 3034 return ERR_PTR(result);
1da177e4
LT		 3035}
3036
1da177e4 3037/*
0804ef4b 3038 * Find the first task with tgid >= tgid
0bc58a91 3039 *
1da177e4 3040 */
19fd4bb2
EB		 3041struct tgid_iter {
3042 unsigned int tgid;
0804ef4b 3043 struct task_struct *task;
19fd4bb2
EB		 3044};
3045static struct tgid_iter next_tgid(struct pid_namespace *ns, struct tgid_iter iter)
3046{
0804ef4b 3047 struct pid *pid;
1da177e4 3048
19fd4bb2
EB		 3049 if (iter.task)
3050 put_task_struct(iter.task);
454cc105 3051 rcu_read_lock();
0804ef4b 3052retry:
19fd4bb2
EB		 3053 iter.task = NULL;
3054 pid = find_ge_pid(iter.tgid, ns);
0804ef4b 3055 if (pid) {
19fd4bb2
EB		 3056 iter.tgid = pid_nr_ns(pid, ns);
3057 iter.task = pid_task(pid, PIDTYPE_PID);
0804ef4b
EB		 3058 /* What we to know is if the pid we have find is the
3059 * pid of a thread_group_leader. Testing for task
3060 * being a thread_group_leader is the obvious thing
3061 * todo but there is a window when it fails, due to
3062 * the pid transfer logic in de_thread.
3063 *
3064 * So we perform the straight forward test of seeing
3065 * if the pid we have found is the pid of a thread
3066 * group leader, and don't worry if the task we have
3067 * found doesn't happen to be a thread group leader.
3068 * As we don't care in the case of readdir.
3069 */
19fd4bb2
EB		 3070 if (!iter.task || !has_group_leader_pid(iter.task)) {
3071 iter.tgid += 1;
0804ef4b 3072 goto retry;
19fd4bb2
EB		 3073 }
3074 get_task_struct(iter.task);
0bc58a91 3075 }
454cc105 3076 rcu_read_unlock();
19fd4bb2 3077 return iter;
1da177e4
LT		 3078}
3079
0097875b 3080#define TGID_OFFSET (FIRST_PROCESS_ENTRY + 2)
0804ef4b 3081
1da177e4 3082/* for the /proc/ directory itself, after non-process stuff has been done */
f0c3b509 3083int proc_pid_readdir(struct file *file, struct dir_context *ctx)
1da177e4 3084{
19fd4bb2 3085 struct tgid_iter iter;
3aa3377f 3086 struct pid_namespace *ns = file_inode(file)->i_sb->s_fs_info;
f0c3b509 3087 loff_t pos = ctx->pos;
1da177e4 3088
021ada7d 3089 if (pos >= PID_MAX_LIMIT + TGID_OFFSET)
f0c3b509 3090 return 0;
1da177e4 3091
0097875b 3092 if (pos == TGID_OFFSET - 2) {
2b0143b5 3093 struct inode *inode = d_inode(ns->proc_self);
db963164 3094 if (!dir_emit(ctx, "self", 4, inode->i_ino, DT_LNK))
f0c3b509 3095 return 0;
0097875b
EB		 3096 ctx->pos = pos = pos + 1;
3097 }
3098 if (pos == TGID_OFFSET - 1) {
2b0143b5 3099 struct inode *inode = d_inode(ns->proc_thread_self);
0097875b
EB		 3100 if (!dir_emit(ctx, "thread-self", 11, inode->i_ino, DT_LNK))
3101 return 0;
3102 ctx->pos = pos = pos + 1;
021ada7d 3103 }
0097875b 3104 iter.tgid = pos - TGID_OFFSET;
19fd4bb2 3105 iter.task = NULL;
19fd4bb2
EB		 3106 for (iter = next_tgid(ns, iter);
3107 iter.task;
3108 iter.tgid += 1, iter = next_tgid(ns, iter)) {
f0c3b509
AV		 3109 char name[PROC_NUMBUF];
3110 int len;
3111 if (!has_pid_permissions(ns, iter.task, 2))
3112 continue;
0499680a 3113
f0c3b509
AV		 3114 len = snprintf(name, sizeof(name), "%d", iter.tgid);
3115 ctx->pos = iter.tgid + TGID_OFFSET;
3116 if (!proc_fill_cache(file, ctx, name, len,
3117 proc_pid_instantiate, iter.task, NULL)) {
19fd4bb2 3118 put_task_struct(iter.task);
f0c3b509 3119 return 0;
1da177e4 3120 }
0bc58a91 3121 }
f0c3b509 3122 ctx->pos = PID_MAX_LIMIT + TGID_OFFSET;
0bc58a91
EB		 3123 return 0;
3124}
1da177e4 3125
1b3044e3
JD		 3126/*
3127 * proc_tid_comm_permission is a special permission function exclusively
3128 * used for the node /proc/<pid>/task/<tid>/comm.
3129 * It bypasses generic permission checks in the case where a task of the same
3130 * task group attempts to access the node.
3131 * The rationale behind this is that glibc and bionic access this node for
3132 * cross thread naming (pthread_set/getname_np(!self)). However, if
3133 * PR_SET_DUMPABLE gets set to 0 this node among others becomes uid=0 gid=0,
3134 * which locks out the cross thread naming implementation.
3135 * This function makes sure that the node is always accessible for members of
3136 * same thread group.
3137 */
3138static int proc_tid_comm_permission(struct inode *inode, int mask)
3139{
3140 bool is_same_tgroup;
3141 struct task_struct *task;
3142
3143 task = get_proc_task(inode);
3144 if (!task)
3145 return -ESRCH;
3146 is_same_tgroup = same_thread_group(current, task);
3147 put_task_struct(task);
3148
3149 if (likely(is_same_tgroup && !(mask & MAY_EXEC))) {
3150 /* This file (/proc/<pid>/task/<tid>/comm) can always be
3151 * read or written by the members of the corresponding
3152 * thread group.
3153 */
3154 return 0;
3155 }
3156
3157 return generic_permission(inode, mask);
3158}
3159
3160static const struct inode_operations proc_tid_comm_inode_operations = {
3161 .permission = proc_tid_comm_permission,
3162};
3163
28a6d671
EB		 3164/*
3165 * Tasks
3166 */
c5141e6d 3167static const struct pid_entry tid_base_stuff[] = {
631f9c18 3168 DIR("fd", S_IRUSR|S_IXUSR, proc_fd_inode_operations, proc_fd_operations),
3835541d 3169 DIR("fdinfo", S_IRUSR|S_IXUSR, proc_fdinfo_inode_operations, proc_fdinfo_operations),
6b4e306a 3170 DIR("ns", S_IRUSR|S_IXUGO, proc_ns_dir_inode_operations, proc_ns_dir_operations),
6ba8ed79
EB		 3171#ifdef CONFIG_NET
3172 DIR("net", S_IRUGO|S_IXUGO, proc_net_inode_operations, proc_net_operations),
3173#endif
631f9c18 3174 REG("environ", S_IRUSR, proc_environ_operations),
f9ea536e 3175 ONE("auxv", S_IRUSR, proc_pid_auxv),
631f9c18 3176 ONE("status", S_IRUGO, proc_pid_status),
35a35046 3177 ONE("personality", S_IRUSR, proc_pid_personality),
1c963eb1 3178 ONE("limits", S_IRUGO, proc_pid_limits),
43ae34cb 3179#ifdef CONFIG_SCHED_DEBUG
631f9c18 3180 REG("sched", S_IRUGO|S_IWUSR, proc_pid_sched_operations),
ebcb6734 3181#endif
1b3044e3
JD		 3182 NOD("comm", S_IFREG|S_IRUGO|S_IWUSR,
3183 &proc_tid_comm_inode_operations,
3184 &proc_pid_set_comm_operations, {}),
ebcb6734 3185#ifdef CONFIG_HAVE_ARCH_TRACEHOOK
09d93bd6 3186 ONE("syscall", S_IRUSR, proc_pid_syscall),
43ae34cb 3187#endif
c2c0bb44 3188 REG("cmdline", S_IRUGO, proc_pid_cmdline_ops),
631f9c18
AD		 3189 ONE("stat", S_IRUGO, proc_tid_stat),
3190 ONE("statm", S_IRUGO, proc_pid_statm),
b7643757 3191 REG("maps", S_IRUGO, proc_tid_maps_operations),
2e13ba54 3192#ifdef CONFIG_PROC_CHILDREN
81841161
CG		 3193 REG("children", S_IRUGO, proc_tid_children_operations),
3194#endif
28a6d671 3195#ifdef CONFIG_NUMA
b7643757 3196 REG("numa_maps", S_IRUGO, proc_tid_numa_maps_operations),
28a6d671 3197#endif
631f9c18
AD		 3198 REG("mem", S_IRUSR|S_IWUSR, proc_mem_operations),
3199 LNK("cwd", proc_cwd_link),
3200 LNK("root", proc_root_link),
3201 LNK("exe", proc_exe_link),
3202 REG("mounts", S_IRUGO, proc_mounts_operations),
3203 REG("mountinfo", S_IRUGO, proc_mountinfo_operations),
1e883281 3204#ifdef CONFIG_PROC_PAGE_MONITOR
631f9c18 3205 REG("clear_refs", S_IWUSR, proc_clear_refs_operations),
b7643757 3206 REG("smaps", S_IRUGO, proc_tid_smaps_operations),
32ed74a4 3207 REG("pagemap", S_IRUSR, proc_pagemap_operations),
28a6d671
EB		 3208#endif
3209#ifdef CONFIG_SECURITY
631f9c18 3210 DIR("attr", S_IRUGO|S_IXUGO, proc_attr_dir_inode_operations, proc_attr_dir_operations),
28a6d671
EB		 3211#endif
3212#ifdef CONFIG_KALLSYMS
edfcd606 3213 ONE("wchan", S_IRUGO, proc_pid_wchan),
28a6d671 3214#endif
2ec220e2 3215#ifdef CONFIG_STACKTRACE
35a35046 3216 ONE("stack", S_IRUSR, proc_pid_stack),
28a6d671 3217#endif
5968cece 3218#ifdef CONFIG_SCHED_INFO
f6e826ca 3219 ONE("schedstat", S_IRUGO, proc_pid_schedstat),
28a6d671 3220#endif
9745512c 3221#ifdef CONFIG_LATENCYTOP
631f9c18 3222 REG("latency", S_IRUGO, proc_lstats_operations),
9745512c 3223#endif
8793d854 3224#ifdef CONFIG_PROC_PID_CPUSET
52de4779 3225 ONE("cpuset", S_IRUGO, proc_cpuset_show),
a424316c
PM		 3226#endif
3227#ifdef CONFIG_CGROUPS
006f4ac4 3228 ONE("cgroup", S_IRUGO, proc_cgroup_show),
28a6d671 3229#endif
6ba51e37 3230 ONE("oom_score", S_IRUGO, proc_oom_score),
fa0cbbf1 3231 REG("oom_adj", S_IRUGO|S_IWUSR, proc_oom_adj_operations),
a63d83f4 3232 REG("oom_score_adj", S_IRUGO|S_IWUSR, proc_oom_score_adj_operations),
28a6d671 3233#ifdef CONFIG_AUDITSYSCALL
631f9c18 3234 REG("loginuid", S_IWUSR|S_IRUGO, proc_loginuid_operations),
26ec3c64 3235 REG("sessionid", S_IRUGO, proc_sessionid_operations),
28a6d671 3236#endif
f4f154fd 3237#ifdef CONFIG_FAULT_INJECTION
631f9c18 3238 REG("make-it-fail", S_IRUGO|S_IWUSR, proc_fault_inject_operations),
f4f154fd 3239#endif
297c5d92 3240#ifdef CONFIG_TASK_IO_ACCOUNTING
19aadc98 3241 ONE("io", S_IRUSR, proc_tid_io_accounting),
297c5d92 3242#endif
f133ecca 3243#ifdef CONFIG_HARDWALL
d962c144 3244 ONE("hardwall", S_IRUGO, proc_pid_hardwall),
f133ecca 3245#endif
22d917d8
EB		 3246#ifdef CONFIG_USER_NS
3247 REG("uid_map", S_IRUGO|S_IWUSR, proc_uid_map_operations),
3248 REG("gid_map", S_IRUGO|S_IWUSR, proc_gid_map_operations),
f76d207a 3249 REG("projid_map", S_IRUGO|S_IWUSR, proc_projid_map_operations),
9cc46516 3250 REG("setgroups", S_IRUGO|S_IWUSR, proc_setgroups_operations),
22d917d8 3251#endif
28a6d671
EB		 3252};
3253
f0c3b509 3254static int proc_tid_base_readdir(struct file *file, struct dir_context *ctx)
28a6d671 3255{
f0c3b509
AV		 3256 return proc_pident_readdir(file, ctx,
3257 tid_base_stuff, ARRAY_SIZE(tid_base_stuff));
28a6d671
EB		 3258}
3259
00cd8dd3
AV		 3260static struct dentry *proc_tid_base_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags)
3261{
7bcd6b0e
EB		 3262 return proc_pident_lookup(dir, dentry,
3263 tid_base_stuff, ARRAY_SIZE(tid_base_stuff));
28a6d671
EB		 3264}
3265
00977a59 3266static const struct file_operations proc_tid_base_operations = {
28a6d671 3267 .read = generic_read_dir,
f50752ea
AV		 3268 .iterate_shared = proc_tid_base_readdir,
3269 .llseek = generic_file_llseek,
28a6d671
EB		 3270};
3271
c5ef1c42 3272static const struct inode_operations proc_tid_base_inode_operations = {
28a6d671
EB		 3273 .lookup = proc_tid_base_lookup,
3274 .getattr = pid_getattr,
3275 .setattr = proc_setattr,
3276};
3277
c52a47ac 3278static int proc_task_instantiate(struct inode *dir,
c5141e6d 3279 struct dentry *dentry, struct task_struct *task, const void *ptr)
444ceed8 3280{
444ceed8 3281 struct inode *inode;
61a28784 3282 inode = proc_pid_make_inode(dir->i_sb, task);
444ceed8
EB		 3283
3284 if (!inode)
3285 goto out;
3286 inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO;
3287 inode->i_op = &proc_tid_base_inode_operations;
3288 inode->i_fop = &proc_tid_base_operations;
3289 inode->i_flags|=S_IMMUTABLE;
aed54175 3290
bfe86848
MS		 3291 set_nlink(inode, 2 + pid_entry_count_dirs(tid_base_stuff,
3292 ARRAY_SIZE(tid_base_stuff)));
444ceed8 3293
fb045adb 3294 d_set_d_op(dentry, &pid_dentry_operations);
444ceed8
EB		 3295
3296 d_add(dentry, inode);
3297 /* Close the race of the process dying before we return the dentry */
0b728e19 3298 if (pid_revalidate(dentry, 0))
c52a47ac 3299 return 0;
444ceed8 3300out:
c52a47ac 3301 return -ENOENT;
444ceed8
EB		 3302}
3303
00cd8dd3 3304static struct dentry *proc_task_lookup(struct inode *dir, struct dentry * dentry, unsigned int flags)
28a6d671 3305{
c52a47ac 3306 int result = -ENOENT;
28a6d671
EB		 3307 struct task_struct *task;
3308 struct task_struct *leader = get_proc_task(dir);
28a6d671 3309 unsigned tid;
b488893a 3310 struct pid_namespace *ns;
28a6d671
EB		 3311
3312 if (!leader)
3313 goto out_no_task;
3314
dbcdb504 3315 tid = name_to_int(&dentry->d_name);
28a6d671
EB		 3316 if (tid == ~0U)
3317 goto out;
3318
b488893a 3319 ns = dentry->d_sb->s_fs_info;
28a6d671 3320 rcu_read_lock();
b488893a 3321 task = find_task_by_pid_ns(tid, ns);
28a6d671
EB		 3322 if (task)
3323 get_task_struct(task);
3324 rcu_read_unlock();
3325 if (!task)
3326 goto out;
bac0abd6 3327 if (!same_thread_group(leader, task))
28a6d671
EB		 3328 goto out_drop_task;
3329
444ceed8 3330 result = proc_task_instantiate(dir, dentry, task, NULL);
28a6d671
EB		 3331out_drop_task:
3332 put_task_struct(task);
3333out:
3334 put_task_struct(leader);
3335out_no_task:
c52a47ac 3336 return ERR_PTR(result);
28a6d671
EB		 3337}
3338
0bc58a91
EB		 3339/*
3340 * Find the first tid of a thread group to return to user space.
3341 *
3342 * Usually this is just the thread group leader, but if the users
3343 * buffer was too small or there was a seek into the middle of the
3344 * directory we have more work todo.
3345 *
3346 * In the case of a short read we start with find_task_by_pid.
3347 *
3348 * In the case of a seek we start with the leader and walk nr
3349 * threads past it.
3350 */
9f6e963f
ON		 3351static struct task_struct *first_tid(struct pid *pid, int tid, loff_t f_pos,
3352 struct pid_namespace *ns)
0bc58a91 3353{
d855a4b7 3354 struct task_struct *pos, *task;
9f6e963f
ON		 3355 unsigned long nr = f_pos;
3356
3357 if (nr != f_pos) /* 32bit overflow? */
3358 return NULL;
1da177e4 3359
cc288738 3360 rcu_read_lock();
d855a4b7
ON		 3361 task = pid_task(pid, PIDTYPE_PID);
3362 if (!task)
3363 goto fail;
3364
3365 /* Attempt to start with the tid of a thread */
9f6e963f 3366 if (tid && nr) {
b488893a 3367 pos = find_task_by_pid_ns(tid, ns);
d855a4b7 3368 if (pos && same_thread_group(pos, task))
a872ff0c 3369 goto found;
0bc58a91 3370 }
1da177e4 3371
0bc58a91 3372 /* If nr exceeds the number of threads there is nothing todo */
9f6e963f 3373 if (nr >= get_nr_threads(task))
c986c14a 3374 goto fail;
1da177e4 3375
a872ff0c
ON		 3376 /* If we haven't found our starting place yet start
3377 * with the leader and walk nr threads forward.
0bc58a91 3378 */
d855a4b7 3379 pos = task = task->group_leader;
c986c14a 3380 do {
9f6e963f 3381 if (!nr--)
c986c14a 3382 goto found;
d855a4b7 3383 } while_each_thread(task, pos);
c986c14a
ON		 3384fail:
3385 pos = NULL;
3386 goto out;
a872ff0c
ON		 3387found:
3388 get_task_struct(pos);
3389out:
cc288738 3390 rcu_read_unlock();
0bc58a91
EB		 3391 return pos;
3392}
3393
3394/*
3395 * Find the next thread in the thread list.
3396 * Return NULL if there is an error or no next thread.
3397 *
3398 * The reference to the input task_struct is released.
3399 */
3400static struct task_struct *next_tid(struct task_struct *start)
3401{
c1df7fb8 3402 struct task_struct *pos = NULL;
cc288738 3403 rcu_read_lock();
c1df7fb8 3404 if (pid_alive(start)) {
0bc58a91 3405 pos = next_thread(start);
c1df7fb8
ON		 3406 if (thread_group_leader(pos))
3407 pos = NULL;
3408 else
3409 get_task_struct(pos);
3410 }
cc288738 3411 rcu_read_unlock();
0bc58a91
EB		 3412 put_task_struct(start);
3413 return pos;
1da177e4
LT		 3414}
3415
3416/* for the /proc/TGID/task/ directories */
f0c3b509 3417static int proc_task_readdir(struct file *file, struct dir_context *ctx)
1da177e4 3418{
d855a4b7
ON		 3419 struct inode *inode = file_inode(file);
3420 struct task_struct *task;
b488893a 3421 struct pid_namespace *ns;
f0c3b509 3422 int tid;
1da177e4 3423
d855a4b7 3424 if (proc_inode_is_dead(inode))
f0c3b509 3425 return -ENOENT;
1da177e4 3426
f0c3b509 3427 if (!dir_emit_dots(file, ctx))
d855a4b7 3428 return 0;
1da177e4 3429
0bc58a91
EB		 3430 /* f_version caches the tgid value that the last readdir call couldn't
3431 * return. lseek aka telldir automagically resets f_version to 0.
3432 */
3aa3377f 3433 ns = inode->i_sb->s_fs_info;
f0c3b509
AV		 3434 tid = (int)file->f_version;
3435 file->f_version = 0;
d855a4b7 3436 for (task = first_tid(proc_pid(inode), tid, ctx->pos - 2, ns);
0bc58a91 3437 task;
f0c3b509
AV		 3438 task = next_tid(task), ctx->pos++) {
3439 char name[PROC_NUMBUF];
3440 int len;
b488893a 3441 tid = task_pid_nr_ns(task, ns);
f0c3b509
AV		 3442 len = snprintf(name, sizeof(name), "%d", tid);
3443 if (!proc_fill_cache(file, ctx, name, len,
3444 proc_task_instantiate, task, NULL)) {
0bc58a91
EB		 3445 /* returning this tgid failed, save it as the first
3446 * pid for the next readir call */
f0c3b509 3447 file->f_version = (u64)tid;
0bc58a91 3448 put_task_struct(task);
1da177e4 3449 break;
0bc58a91 3450 }
1da177e4 3451 }
d855a4b7 3452
f0c3b509 3453 return 0;
1da177e4 3454}
6e66b52b
EB		 3455
3456static int proc_task_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
3457{
2b0143b5 3458 struct inode *inode = d_inode(dentry);
99f89551 3459 struct task_struct *p = get_proc_task(inode);
6e66b52b
EB		 3460 generic_fillattr(inode, stat);
3461
99f89551 3462 if (p) {
99f89551 3463 stat->nlink += get_nr_threads(p);
99f89551 3464 put_task_struct(p);
6e66b52b
EB		 3465 }
3466
3467 return 0;
3468}
28a6d671 3469
c5ef1c42 3470static const struct inode_operations proc_task_inode_operations = {
28a6d671
EB		 3471 .lookup = proc_task_lookup,
3472 .getattr = proc_task_getattr,
3473 .setattr = proc_setattr,
0499680a 3474 .permission = proc_pid_permission,
28a6d671
EB		 3475};
3476
00977a59 3477static const struct file_operations proc_task_operations = {
28a6d671 3478 .read = generic_read_dir,
f50752ea
AV		 3479 .iterate_shared = proc_task_readdir,
3480 .llseek = generic_file_llseek,
28a6d671 3481};
Linux kernel - Deliverables
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