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proc: enable writing to /proc/pid/mem
[thirdparty/kernel/stable.git] / fs / proc / base.c
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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>
a424316c 76#include <linux/cgroup.h>
1da177e4
LT		 77#include <linux/cpuset.h>
78#include <linux/audit.h>
5addc5dd 79#include <linux/poll.h>
1651e14e 80#include <linux/nsproxy.h>
8ac773b4 81#include <linux/oom.h>
3cb4a0bb 82#include <linux/elf.h>
60347f67 83#include <linux/pid_namespace.h>
5ad4e53b 84#include <linux/fs_struct.h>
5a0e3ad6 85#include <linux/slab.h>
1da177e4
LT		 86#include "internal.h"
87
0f2fe20f
EB		 88/* NOTE:
89 * Implementing inode permission operations in /proc is almost
90 * certainly an error. Permission checks need to happen during
91 * each system call not at open time. The reason is that most of
92 * what we wish to check for permissions in /proc varies at runtime.
93 *
94 * The classic example of a problem is opening file descriptors
95 * in /proc for a task before it execs a suid executable.
96 */
97
1da177e4 98struct pid_entry {
1da177e4 99 char *name;
c5141e6d 100 int len;
1da177e4 101 mode_t mode;
c5ef1c42 102 const struct inode_operations *iop;
00977a59 103 const struct file_operations *fop;
20cdc894 104 union proc_op op;
1da177e4
LT		 105};
106
61a28784 107#define NOD(NAME, MODE, IOP, FOP, OP) { \
20cdc894 108 .name = (NAME), \
c5141e6d 109 .len = sizeof(NAME) - 1, \
20cdc894
EB		 110 .mode = MODE, \
111 .iop = IOP, \
112 .fop = FOP, \
113 .op = OP, \
114}
115
631f9c18
AD		 116#define DIR(NAME, MODE, iops, fops) \
117 NOD(NAME, (S_IFDIR|(MODE)), &iops, &fops, {} )
118#define LNK(NAME, get_link) \
61a28784 119 NOD(NAME, (S_IFLNK|S_IRWXUGO), \
20cdc894 120 &proc_pid_link_inode_operations, NULL, \
631f9c18
AD		 121 { .proc_get_link = get_link } )
122#define REG(NAME, MODE, fops) \
123 NOD(NAME, (S_IFREG|(MODE)), NULL, &fops, {})
124#define INF(NAME, MODE, read) \
61a28784 125 NOD(NAME, (S_IFREG|(MODE)), \
20cdc894 126 NULL, &proc_info_file_operations, \
631f9c18
AD		 127 { .proc_read = read } )
128#define ONE(NAME, MODE, show) \
be614086
EB		 129 NOD(NAME, (S_IFREG|(MODE)), \
130 NULL, &proc_single_file_operations, \
631f9c18 131 { .proc_show = show } )
1da177e4 132
aed54175
VN		 133/*
134 * Count the number of hardlinks for the pid_entry table, excluding the .
135 * and .. links.
136 */
137static unsigned int pid_entry_count_dirs(const struct pid_entry *entries,
138 unsigned int n)
139{
140 unsigned int i;
141 unsigned int count;
142
143 count = 0;
144 for (i = 0; i < n; ++i) {
145 if (S_ISDIR(entries[i].mode))
146 ++count;
147 }
148
149 return count;
150}
151
f7ad3c6b 152static int get_task_root(struct task_struct *task, struct path *root)
1da177e4 153{
7c2c7d99
HD		 154 int result = -ENOENT;
155
0494f6ec 156 task_lock(task);
f7ad3c6b
MS		 157 if (task->fs) {
158 get_fs_root(task->fs, root);
7c2c7d99
HD		 159 result = 0;
160 }
0494f6ec 161 task_unlock(task);
7c2c7d99 162 return result;
0494f6ec
MS		 163}
164
3dcd25f3 165static int proc_cwd_link(struct inode *inode, struct path *path)
0494f6ec 166{
99f89551 167 struct task_struct *task = get_proc_task(inode);
0494f6ec 168 int result = -ENOENT;
99f89551
EB		 169
170 if (task) {
f7ad3c6b
MS		 171 task_lock(task);
172 if (task->fs) {
173 get_fs_pwd(task->fs, path);
174 result = 0;
175 }
176 task_unlock(task);
99f89551
EB		 177 put_task_struct(task);
178 }
1da177e4
LT		 179 return result;
180}
181
3dcd25f3 182static int proc_root_link(struct inode *inode, struct path *path)
1da177e4 183{
99f89551 184 struct task_struct *task = get_proc_task(inode);
1da177e4 185 int result = -ENOENT;
99f89551
EB		 186
187 if (task) {
f7ad3c6b 188 result = get_task_root(task, path);
99f89551
EB		 189 put_task_struct(task);
190 }
1da177e4
LT		 191 return result;
192}
193
8b0db9db 194static struct mm_struct *__check_mem_permission(struct task_struct *task)
638fa202 195{
8b0db9db
SW		 196 struct mm_struct *mm;
197
198 mm = get_task_mm(task);
199 if (!mm)
200 return ERR_PTR(-EINVAL);
201
638fa202
RM		 202 /*
203 * A task can always look at itself, in case it chooses
204 * to use system calls instead of load instructions.
205 */
206 if (task == current)
8b0db9db 207 return mm;
638fa202
RM		 208
209 /*
210 * If current is actively ptrace'ing, and would also be
211 * permitted to freshly attach with ptrace now, permit it.
212 */
0d094efe
RM		 213 if (task_is_stopped_or_traced(task)) {
214 int match;
215 rcu_read_lock();
216 match = (tracehook_tracer_task(task) == current);
217 rcu_read_unlock();
218 if (match && ptrace_may_access(task, PTRACE_MODE_ATTACH))
8b0db9db 219 return mm;
0d094efe 220 }
638fa202
RM		 221
222 /*
223 * Noone else is allowed.
224 */
8b0db9db
SW		 225 mmput(mm);
226 return ERR_PTR(-EPERM);
638fa202 227}
1da177e4 228
18f661bc 229/*
8b0db9db
SW		 230 * If current may access user memory in @task return a reference to the
231 * corresponding mm, otherwise ERR_PTR.
18f661bc 232 */
8b0db9db 233static struct mm_struct *check_mem_permission(struct task_struct *task)
18f661bc 234{
8b0db9db 235 struct mm_struct *mm;
18f661bc
SW		 236 int err;
237
238 /*
239 * Avoid racing if task exec's as we might get a new mm but validate
240 * against old credentials.
241 */
242 err = mutex_lock_killable(&task->signal->cred_guard_mutex);
243 if (err)
8b0db9db 244 return ERR_PTR(err);
18f661bc 245
8b0db9db 246 mm = __check_mem_permission(task);
18f661bc
SW		 247 mutex_unlock(&task->signal->cred_guard_mutex);
248
8b0db9db 249 return mm;
18f661bc
SW		 250}
251
831830b5
AV		 252struct mm_struct *mm_for_maps(struct task_struct *task)
253{
704b836c 254 struct mm_struct *mm;
ec6fd8a4 255 int err;
704b836c 256
ec6fd8a4
AV		 257 err = mutex_lock_killable(&task->signal->cred_guard_mutex);
258 if (err)
259 return ERR_PTR(err);
00f89d21 260
704b836c
ON		 261 mm = get_task_mm(task);
262 if (mm && mm != current->mm &&
263 !ptrace_may_access(task, PTRACE_MODE_READ)) {
264 mmput(mm);
ec6fd8a4 265 mm = ERR_PTR(-EACCES);
13f0feaf 266 }
9b1bf12d 267 mutex_unlock(&task->signal->cred_guard_mutex);
704b836c 268
831830b5 269 return mm;
831830b5
AV		 270}
271
1da177e4
LT		 272static int proc_pid_cmdline(struct task_struct *task, char * buffer)
273{
274 int res = 0;
275 unsigned int len;
276 struct mm_struct *mm = get_task_mm(task);
277 if (!mm)
278 goto out;
279 if (!mm->arg_end)
280 goto out_mm; /* Shh! No looking before we're done */
281
282 len = mm->arg_end - mm->arg_start;
283
284 if (len > PAGE_SIZE)
285 len = PAGE_SIZE;
286
287 res = access_process_vm(task, mm->arg_start, buffer, len, 0);
288
289 // If the nul at the end of args has been overwritten, then
290 // assume application is using setproctitle(3).
291 if (res > 0 && buffer[res-1] != '\0' && len < PAGE_SIZE) {
292 len = strnlen(buffer, res);
293 if (len < res) {
294 res = len;
295 } else {
296 len = mm->env_end - mm->env_start;
297 if (len > PAGE_SIZE - res)
298 len = PAGE_SIZE - res;
299 res += access_process_vm(task, mm->env_start, buffer+res, len, 0);
300 res = strnlen(buffer, res);
301 }
302 }
303out_mm:
304 mmput(mm);
305out:
306 return res;
307}
308
309static int proc_pid_auxv(struct task_struct *task, char *buffer)
310{
2fadaef4
AV		 311 struct mm_struct *mm = mm_for_maps(task);
312 int res = PTR_ERR(mm);
313 if (mm && !IS_ERR(mm)) {
1da177e4 314 unsigned int nwords = 0;
dfe6b7d9 315 do {
1da177e4 316 nwords += 2;
dfe6b7d9 317 } while (mm->saved_auxv[nwords - 2] != 0); /* AT_NULL */
1da177e4
LT		 318 res = nwords * sizeof(mm->saved_auxv[0]);
319 if (res > PAGE_SIZE)
320 res = PAGE_SIZE;
321 memcpy(buffer, mm->saved_auxv, res);
322 mmput(mm);
323 }
324 return res;
325}
326
327
328#ifdef CONFIG_KALLSYMS
329/*
330 * Provides a wchan file via kallsyms in a proper one-value-per-file format.
331 * Returns the resolved symbol. If that fails, simply return the address.
332 */
333static int proc_pid_wchan(struct task_struct *task, char *buffer)
334{
ffb45122 335 unsigned long wchan;
9281acea 336 char symname[KSYM_NAME_LEN];
1da177e4
LT		 337
338 wchan = get_wchan(task);
339
9d65cb4a 340 if (lookup_symbol_name(wchan, symname) < 0)
f83ce3e6
JE		 341 if (!ptrace_may_access(task, PTRACE_MODE_READ))
342 return 0;
343 else
344 return sprintf(buffer, "%lu", wchan);
9d65cb4a
AD		 345 else
346 return sprintf(buffer, "%s", symname);
1da177e4
LT		 347}
348#endif /* CONFIG_KALLSYMS */
349
2ec220e2
KC		 350#ifdef CONFIG_STACKTRACE
351
352#define MAX_STACK_TRACE_DEPTH 64
353
354static int proc_pid_stack(struct seq_file *m, struct pid_namespace *ns,
355 struct pid *pid, struct task_struct *task)
356{
357 struct stack_trace trace;
358 unsigned long *entries;
359 int i;
360
361 entries = kmalloc(MAX_STACK_TRACE_DEPTH * sizeof(*entries), GFP_KERNEL);
362 if (!entries)
363 return -ENOMEM;
364
365 trace.nr_entries = 0;
366 trace.max_entries = MAX_STACK_TRACE_DEPTH;
367 trace.entries = entries;
368 trace.skip = 0;
369 save_stack_trace_tsk(task, &trace);
370
371 for (i = 0; i < trace.nr_entries; i++) {
372 seq_printf(m, "[<%p>] %pS\n",
373 (void *)entries[i], (void *)entries[i]);
374 }
375 kfree(entries);
376
377 return 0;
378}
379#endif
380
1da177e4
LT		 381#ifdef CONFIG_SCHEDSTATS
382/*
383 * Provides /proc/PID/schedstat
384 */
385static int proc_pid_schedstat(struct task_struct *task, char *buffer)
386{
172ba844 387 return sprintf(buffer, "%llu %llu %lu\n",
826e08b0
IM		 388 (unsigned long long)task->se.sum_exec_runtime,
389 (unsigned long long)task->sched_info.run_delay,
2d72376b 390 task->sched_info.pcount);
1da177e4
LT		 391}
392#endif
393
9745512c
AV		 394#ifdef CONFIG_LATENCYTOP
395static int lstats_show_proc(struct seq_file *m, void *v)
396{
397 int i;
13d77c37
HS		 398 struct inode *inode = m->private;
399 struct task_struct *task = get_proc_task(inode);
9745512c 400
13d77c37
HS		 401 if (!task)
402 return -ESRCH;
403 seq_puts(m, "Latency Top version : v0.1\n");
9745512c 404 for (i = 0; i < 32; i++) {
34e49d4f
JP		 405 struct latency_record *lr = &task->latency_record[i];
406 if (lr->backtrace[0]) {
9745512c 407 int q;
34e49d4f
JP		 408 seq_printf(m, "%i %li %li",
409 lr->count, lr->time, lr->max);
9745512c 410 for (q = 0; q < LT_BACKTRACEDEPTH; q++) {
34e49d4f
JP		 411 unsigned long bt = lr->backtrace[q];
412 if (!bt)
9745512c 413 break;
34e49d4f 414 if (bt == ULONG_MAX)
9745512c 415 break;
34e49d4f 416 seq_printf(m, " %ps", (void *)bt);
9745512c 417 }
9d6de12f 418 seq_putc(m, '\n');
9745512c
AV		 419 }
420
421 }
13d77c37 422 put_task_struct(task);
9745512c
AV		 423 return 0;
424}
425
426static int lstats_open(struct inode *inode, struct file *file)
427{
13d77c37 428 return single_open(file, lstats_show_proc, inode);
d6643d12
HS		 429}
430
9745512c
AV		 431static ssize_t lstats_write(struct file *file, const char __user *buf,
432 size_t count, loff_t *offs)
433{
13d77c37 434 struct task_struct *task = get_proc_task(file->f_dentry->d_inode);
9745512c 435
13d77c37
HS		 436 if (!task)
437 return -ESRCH;
9745512c 438 clear_all_latency_tracing(task);
13d77c37 439 put_task_struct(task);
9745512c
AV		 440
441 return count;
442}
443
444static const struct file_operations proc_lstats_operations = {
445 .open = lstats_open,
446 .read = seq_read,
447 .write = lstats_write,
448 .llseek = seq_lseek,
13d77c37 449 .release = single_release,
9745512c
AV		 450};
451
452#endif
453
1da177e4
LT		 454static int proc_oom_score(struct task_struct *task, char *buffer)
455{
b95c35e7 456 unsigned long points = 0;
1da177e4 457
19c5d45a 458 read_lock(&tasklist_lock);
b95c35e7 459 if (pid_alive(task))
a63d83f4
DR		 460 points = oom_badness(task, NULL, NULL,
461 totalram_pages + total_swap_pages);
19c5d45a 462 read_unlock(&tasklist_lock);
1da177e4
LT		 463 return sprintf(buffer, "%lu\n", points);
464}
465
d85f50d5
NH		 466struct limit_names {
467 char *name;
468 char *unit;
469};
470
471static const struct limit_names lnames[RLIM_NLIMITS] = {
cff4edb5 472 [RLIMIT_CPU] = {"Max cpu time", "seconds"},
d85f50d5
NH		 473 [RLIMIT_FSIZE] = {"Max file size", "bytes"},
474 [RLIMIT_DATA] = {"Max data size", "bytes"},
475 [RLIMIT_STACK] = {"Max stack size", "bytes"},
476 [RLIMIT_CORE] = {"Max core file size", "bytes"},
477 [RLIMIT_RSS] = {"Max resident set", "bytes"},
478 [RLIMIT_NPROC] = {"Max processes", "processes"},
479 [RLIMIT_NOFILE] = {"Max open files", "files"},
480 [RLIMIT_MEMLOCK] = {"Max locked memory", "bytes"},
481 [RLIMIT_AS] = {"Max address space", "bytes"},
482 [RLIMIT_LOCKS] = {"Max file locks", "locks"},
483 [RLIMIT_SIGPENDING] = {"Max pending signals", "signals"},
484 [RLIMIT_MSGQUEUE] = {"Max msgqueue size", "bytes"},
485 [RLIMIT_NICE] = {"Max nice priority", NULL},
486 [RLIMIT_RTPRIO] = {"Max realtime priority", NULL},
8808117c 487 [RLIMIT_RTTIME] = {"Max realtime timeout", "us"},
d85f50d5
NH		 488};
489
490/* Display limits for a process */
491static int proc_pid_limits(struct task_struct *task, char *buffer)
492{
493 unsigned int i;
494 int count = 0;
495 unsigned long flags;
496 char *bufptr = buffer;
497
498 struct rlimit rlim[RLIM_NLIMITS];
499
a6bebbc8 500 if (!lock_task_sighand(task, &flags))
d85f50d5 501 return 0;
d85f50d5
NH		 502 memcpy(rlim, task->signal->rlim, sizeof(struct rlimit) * RLIM_NLIMITS);
503 unlock_task_sighand(task, &flags);
d85f50d5
NH		 504
505 /*
506 * print the file header
507 */
508 count += sprintf(&bufptr[count], "%-25s %-20s %-20s %-10s\n",
509 "Limit", "Soft Limit", "Hard Limit", "Units");
510
511 for (i = 0; i < RLIM_NLIMITS; i++) {
512 if (rlim[i].rlim_cur == RLIM_INFINITY)
513 count += sprintf(&bufptr[count], "%-25s %-20s ",
514 lnames[i].name, "unlimited");
515 else
516 count += sprintf(&bufptr[count], "%-25s %-20lu ",
517 lnames[i].name, rlim[i].rlim_cur);
518
519 if (rlim[i].rlim_max == RLIM_INFINITY)
520 count += sprintf(&bufptr[count], "%-20s ", "unlimited");
521 else
522 count += sprintf(&bufptr[count], "%-20lu ",
523 rlim[i].rlim_max);
524
525 if (lnames[i].unit)
526 count += sprintf(&bufptr[count], "%-10s\n",
527 lnames[i].unit);
528 else
529 count += sprintf(&bufptr[count], "\n");
530 }
531
532 return count;
533}
534
ebcb6734
RM		 535#ifdef CONFIG_HAVE_ARCH_TRACEHOOK
536static int proc_pid_syscall(struct task_struct *task, char *buffer)
537{
538 long nr;
539 unsigned long args[6], sp, pc;
540
541 if (task_current_syscall(task, &nr, args, 6, &sp, &pc))
542 return sprintf(buffer, "running\n");
543
544 if (nr < 0)
545 return sprintf(buffer, "%ld 0x%lx 0x%lx\n", nr, sp, pc);
546
547 return sprintf(buffer,
548 "%ld 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx\n",
549 nr,
550 args[0], args[1], args[2], args[3], args[4], args[5],
551 sp, pc);
552}
553#endif /* CONFIG_HAVE_ARCH_TRACEHOOK */
554
1da177e4
LT		 555/************************************************************************/
556/* Here the fs part begins */
557/************************************************************************/
558
559/* permission checks */
778c1144 560static int proc_fd_access_allowed(struct inode *inode)
1da177e4 561{
778c1144
EB		 562 struct task_struct *task;
563 int allowed = 0;
df26c40e
EB		 564 /* Allow access to a task's file descriptors if it is us or we
565 * may use ptrace attach to the process and find out that
566 * information.
778c1144
EB		 567 */
568 task = get_proc_task(inode);
df26c40e 569 if (task) {
006ebb40 570 allowed = ptrace_may_access(task, PTRACE_MODE_READ);
778c1144 571 put_task_struct(task);
df26c40e 572 }
778c1144 573 return allowed;
1da177e4
LT		 574}
575
6d76fa58
LT		 576static int proc_setattr(struct dentry *dentry, struct iattr *attr)
577{
578 int error;
579 struct inode *inode = dentry->d_inode;
580
581 if (attr->ia_valid & ATTR_MODE)
582 return -EPERM;
583
584 error = inode_change_ok(inode, attr);
1025774c
CH		 585 if (error)
586 return error;
587
588 if ((attr->ia_valid & ATTR_SIZE) &&
589 attr->ia_size != i_size_read(inode)) {
590 error = vmtruncate(inode, attr->ia_size);
591 if (error)
592 return error;
593 }
594
595 setattr_copy(inode, attr);
596 mark_inode_dirty(inode);
597 return 0;
6d76fa58
LT		 598}
599
c5ef1c42 600static const struct inode_operations proc_def_inode_operations = {
6d76fa58
LT		 601 .setattr = proc_setattr,
602};
603
a1a2c409
MS		 604static int mounts_open_common(struct inode *inode, struct file *file,
605 const struct seq_operations *op)
1da177e4 606{
99f89551 607 struct task_struct *task = get_proc_task(inode);
cf7b708c 608 struct nsproxy *nsp;
6b3286ed 609 struct mnt_namespace *ns = NULL;
a1a2c409 610 struct path root;
5addc5dd
AV		 611 struct proc_mounts *p;
612 int ret = -EINVAL;
1da177e4 613
99f89551 614 if (task) {
cf7b708c
PE		 615 rcu_read_lock();
616 nsp = task_nsproxy(task);
617 if (nsp) {
618 ns = nsp->mnt_ns;
863c4702
AD		 619 if (ns)
620 get_mnt_ns(ns);
621 }
cf7b708c 622 rcu_read_unlock();
f7ad3c6b 623 if (ns && get_task_root(task, &root) == 0)
7c2c7d99 624 ret = 0;
99f89551
EB		 625 put_task_struct(task);
626 }
5addc5dd 627
a1a2c409
MS		 628 if (!ns)
629 goto err;
7c2c7d99 630 if (ret)
a1a2c409
MS		 631 goto err_put_ns;
632
a1a2c409
MS		 633 ret = -ENOMEM;
634 p = kmalloc(sizeof(struct proc_mounts), GFP_KERNEL);
635 if (!p)
636 goto err_put_path;
637
638 file->private_data = &p->m;
639 ret = seq_open(file, op);
640 if (ret)
641 goto err_free;
642
643 p->m.private = p;
644 p->ns = ns;
645 p->root = root;
646 p->event = ns->event;
647
648 return 0;
649
650 err_free:
651 kfree(p);
652 err_put_path:
653 path_put(&root);
654 err_put_ns:
655 put_mnt_ns(ns);
656 err:
1da177e4
LT		 657 return ret;
658}
659
660static int mounts_release(struct inode *inode, struct file *file)
661{
a1a2c409
MS		 662 struct proc_mounts *p = file->private_data;
663 path_put(&p->root);
664 put_mnt_ns(p->ns);
1da177e4
LT		 665 return seq_release(inode, file);
666}
667
5addc5dd
AV		 668static unsigned mounts_poll(struct file *file, poll_table *wait)
669{
670 struct proc_mounts *p = file->private_data;
31b07093 671 unsigned res = POLLIN | POLLRDNORM;
5addc5dd 672
9f5596af
AV		 673 poll_wait(file, &p->ns->poll, wait);
674 if (mnt_had_events(p))
31b07093 675 res |= POLLERR | POLLPRI;
5addc5dd
AV		 676
677 return res;
678}
679
a1a2c409
MS		 680static int mounts_open(struct inode *inode, struct file *file)
681{
682 return mounts_open_common(inode, file, &mounts_op);
683}
684
00977a59 685static const struct file_operations proc_mounts_operations = {
1da177e4
LT		 686 .open = mounts_open,
687 .read = seq_read,
688 .llseek = seq_lseek,
689 .release = mounts_release,
5addc5dd 690 .poll = mounts_poll,
1da177e4
LT		 691};
692
2d4d4864
RP		 693static int mountinfo_open(struct inode *inode, struct file *file)
694{
695 return mounts_open_common(inode, file, &mountinfo_op);
696}
697
698static const struct file_operations proc_mountinfo_operations = {
699 .open = mountinfo_open,
700 .read = seq_read,
701 .llseek = seq_lseek,
702 .release = mounts_release,
703 .poll = mounts_poll,
704};
705
b4629fe2
CL		 706static int mountstats_open(struct inode *inode, struct file *file)
707{
a1a2c409 708 return mounts_open_common(inode, file, &mountstats_op);
b4629fe2
CL		 709}
710
00977a59 711static const struct file_operations proc_mountstats_operations = {
b4629fe2
CL		 712 .open = mountstats_open,
713 .read = seq_read,
714 .llseek = seq_lseek,
715 .release = mounts_release,
716};
717
1da177e4
LT		 718#define PROC_BLOCK_SIZE (3*1024) /* 4K page size but our output routines use some slack for overruns */
719
720static ssize_t proc_info_read(struct file * file, char __user * buf,
721 size_t count, loff_t *ppos)
722{
2fddfeef 723 struct inode * inode = file->f_path.dentry->d_inode;
1da177e4
LT		 724 unsigned long page;
725 ssize_t length;
99f89551
EB		 726 struct task_struct *task = get_proc_task(inode);
727
728 length = -ESRCH;
729 if (!task)
730 goto out_no_task;
1da177e4
LT		 731
732 if (count > PROC_BLOCK_SIZE)
733 count = PROC_BLOCK_SIZE;
99f89551
EB		 734
735 length = -ENOMEM;
e12ba74d 736 if (!(page = __get_free_page(GFP_TEMPORARY)))
99f89551 737 goto out;
1da177e4
LT		 738
739 length = PROC_I(inode)->op.proc_read(task, (char*)page);
740
741 if (length >= 0)
742 length = simple_read_from_buffer(buf, count, ppos, (char *)page, length);
743 free_page(page);
99f89551
EB		 744out:
745 put_task_struct(task);
746out_no_task:
1da177e4
LT		 747 return length;
748}
749
00977a59 750static const struct file_operations proc_info_file_operations = {
1da177e4 751 .read = proc_info_read,
87df8424 752 .llseek = generic_file_llseek,
1da177e4
LT		 753};
754
be614086
EB		 755static int proc_single_show(struct seq_file *m, void *v)
756{
757 struct inode *inode = m->private;
758 struct pid_namespace *ns;
759 struct pid *pid;
760 struct task_struct *task;
761 int ret;
762
763 ns = inode->i_sb->s_fs_info;
764 pid = proc_pid(inode);
765 task = get_pid_task(pid, PIDTYPE_PID);
766 if (!task)
767 return -ESRCH;
768
769 ret = PROC_I(inode)->op.proc_show(m, ns, pid, task);
770
771 put_task_struct(task);
772 return ret;
773}
774
775static int proc_single_open(struct inode *inode, struct file *filp)
776{
c6a34058 777 return single_open(filp, proc_single_show, inode);
be614086
EB		 778}
779
780static const struct file_operations proc_single_file_operations = {
781 .open = proc_single_open,
782 .read = seq_read,
783 .llseek = seq_lseek,
784 .release = single_release,
785};
786
1da177e4
LT		 787static int mem_open(struct inode* inode, struct file* file)
788{
789 file->private_data = (void*)((long)current->self_exec_id);
4a3956c7
KH		 790 /* OK to pass negative loff_t, we can catch out-of-range */
791 file->f_mode |= FMODE_UNSIGNED_OFFSET;
1da177e4
LT		 792 return 0;
793}
794
795static ssize_t mem_read(struct file * file, char __user * buf,
796 size_t count, loff_t *ppos)
797{
2fddfeef 798 struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode);
1da177e4
LT		 799 char *page;
800 unsigned long src = *ppos;
801 int ret = -ESRCH;
802 struct mm_struct *mm;
803
99f89551
EB		 804 if (!task)
805 goto out_no_task;
806
1da177e4 807 ret = -ENOMEM;
e12ba74d 808 page = (char *)__get_free_page(GFP_TEMPORARY);
1da177e4
LT		 809 if (!page)
810 goto out;
811
8b0db9db
SW		 812 mm = check_mem_permission(task);
813 ret = PTR_ERR(mm);
814 if (IS_ERR(mm))
1da177e4
LT		 815 goto out_free;
816
817 ret = -EIO;
818
819 if (file->private_data != (void*)((long)current->self_exec_id))
820 goto out_put;
821
822 ret = 0;
823
824 while (count > 0) {
825 int this_len, retval;
826
827 this_len = (count > PAGE_SIZE) ? PAGE_SIZE : count;
8b0db9db
SW		 828 retval = access_remote_vm(mm, src, page, this_len, 0);
829 if (!retval) {
1da177e4
LT		 830 if (!ret)
831 ret = -EIO;
832 break;
833 }
834
835 if (copy_to_user(buf, page, retval)) {
836 ret = -EFAULT;
837 break;
838 }
839
840 ret += retval;
841 src += retval;
842 buf += retval;
843 count -= retval;
844 }
845 *ppos = src;
846
847out_put:
848 mmput(mm);
849out_free:
850 free_page((unsigned long) page);
851out:
99f89551
EB		 852 put_task_struct(task);
853out_no_task:
1da177e4
LT		 854 return ret;
855}
856
63967fa9 857static ssize_t mem_write(struct file * file, const char __user *buf,
1da177e4
LT		 858 size_t count, loff_t *ppos)
859{
f7ca54f4 860 int copied;
1da177e4 861 char *page;
2fddfeef 862 struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode);
1da177e4 863 unsigned long dst = *ppos;
8b0db9db 864 struct mm_struct *mm;
1da177e4 865
99f89551
EB		 866 copied = -ESRCH;
867 if (!task)
868 goto out_no_task;
869
8b0db9db
SW		 870 mm = check_mem_permission(task);
871 copied = PTR_ERR(mm);
872 if (IS_ERR(mm))
873 goto out_task;
1da177e4 874
26947f8c
SW		 875 copied = -EIO;
876 if (file->private_data != (void *)((long)current->self_exec_id))
8b0db9db 877 goto out_mm;
26947f8c 878
99f89551 879 copied = -ENOMEM;
e12ba74d 880 page = (char *)__get_free_page(GFP_TEMPORARY);
1da177e4 881 if (!page)
8b0db9db 882 goto out_mm;
1da177e4 883
f7ca54f4 884 copied = 0;
1da177e4
LT		 885 while (count > 0) {
886 int this_len, retval;
887
888 this_len = (count > PAGE_SIZE) ? PAGE_SIZE : count;
889 if (copy_from_user(page, buf, this_len)) {
890 copied = -EFAULT;
891 break;
892 }
8b0db9db 893 retval = access_remote_vm(mm, dst, page, this_len, 1);
1da177e4
LT		 894 if (!retval) {
895 if (!copied)
896 copied = -EIO;
897 break;
898 }
899 copied += retval;
900 buf += retval;
901 dst += retval;
902 count -= retval;
903 }
904 *ppos = dst;
905 free_page((unsigned long) page);
8b0db9db
SW		 906out_mm:
907 mmput(mm);
908out_task:
99f89551
EB		 909 put_task_struct(task);
910out_no_task:
1da177e4
LT		 911 return copied;
912}
1da177e4 913
85863e47 914loff_t mem_lseek(struct file *file, loff_t offset, int orig)
1da177e4
LT		 915{
916 switch (orig) {
917 case 0:
918 file->f_pos = offset;
919 break;
920 case 1:
921 file->f_pos += offset;
922 break;
923 default:
924 return -EINVAL;
925 }
926 force_successful_syscall_return();
927 return file->f_pos;
928}
929
00977a59 930static const struct file_operations proc_mem_operations = {
1da177e4
LT		 931 .llseek = mem_lseek,
932 .read = mem_read,
933 .write = mem_write,
934 .open = mem_open,
935};
936
315e28c8
JP		 937static ssize_t environ_read(struct file *file, char __user *buf,
938 size_t count, loff_t *ppos)
939{
940 struct task_struct *task = get_proc_task(file->f_dentry->d_inode);
941 char *page;
942 unsigned long src = *ppos;
943 int ret = -ESRCH;
944 struct mm_struct *mm;
945
946 if (!task)
947 goto out_no_task;
948
315e28c8
JP		 949 ret = -ENOMEM;
950 page = (char *)__get_free_page(GFP_TEMPORARY);
951 if (!page)
952 goto out;
953
315e28c8 954
d6f64b89
AV		 955 mm = mm_for_maps(task);
956 ret = PTR_ERR(mm);
957 if (!mm || IS_ERR(mm))
315e28c8
JP		 958 goto out_free;
959
d6f64b89 960 ret = 0;
315e28c8
JP		 961 while (count > 0) {
962 int this_len, retval, max_len;
963
964 this_len = mm->env_end - (mm->env_start + src);
965
966 if (this_len <= 0)
967 break;
968
969 max_len = (count > PAGE_SIZE) ? PAGE_SIZE : count;
970 this_len = (this_len > max_len) ? max_len : this_len;
971
972 retval = access_process_vm(task, (mm->env_start + src),
973 page, this_len, 0);
974
975 if (retval <= 0) {
976 ret = retval;
977 break;
978 }
979
980 if (copy_to_user(buf, page, retval)) {
981 ret = -EFAULT;
982 break;
983 }
984
985 ret += retval;
986 src += retval;
987 buf += retval;
988 count -= retval;
989 }
990 *ppos = src;
991
992 mmput(mm);
993out_free:
994 free_page((unsigned long) page);
995out:
996 put_task_struct(task);
997out_no_task:
998 return ret;
999}
1000
1001static const struct file_operations proc_environ_operations = {
1002 .read = environ_read,
87df8424 1003 .llseek = generic_file_llseek,
315e28c8
JP		 1004};
1005
1da177e4
LT		 1006static ssize_t oom_adjust_read(struct file *file, char __user *buf,
1007 size_t count, loff_t *ppos)
1008{
2fddfeef 1009 struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode);
8578cea7 1010 char buffer[PROC_NUMBUF];
1da177e4 1011 size_t len;
28b83c51
KM		 1012 int oom_adjust = OOM_DISABLE;
1013 unsigned long flags;
1da177e4 1014
99f89551
EB		 1015 if (!task)
1016 return -ESRCH;
28b83c51
KM		 1017
1018 if (lock_task_sighand(task, &flags)) {
1019 oom_adjust = task->signal->oom_adj;
1020 unlock_task_sighand(task, &flags);
1021 }
1022
99f89551
EB		 1023 put_task_struct(task);
1024
8578cea7 1025 len = snprintf(buffer, sizeof(buffer), "%i\n", oom_adjust);
0c28f287
AM		 1026
1027 return simple_read_from_buffer(buf, count, ppos, buffer, len);
1da177e4
LT		 1028}
1029
1030static ssize_t oom_adjust_write(struct file *file, const char __user *buf,
1031 size_t count, loff_t *ppos)
1032{
99f89551 1033 struct task_struct *task;
5d863b89
KM		 1034 char buffer[PROC_NUMBUF];
1035 long oom_adjust;
28b83c51 1036 unsigned long flags;
5d863b89 1037 int err;
1da177e4 1038
8578cea7
EB		 1039 memset(buffer, 0, sizeof(buffer));
1040 if (count > sizeof(buffer) - 1)
1041 count = sizeof(buffer) - 1;
723548bf
DR		 1042 if (copy_from_user(buffer, buf, count)) {
1043 err = -EFAULT;
1044 goto out;
1045 }
5d863b89
KM		 1046
1047 err = strict_strtol(strstrip(buffer), 0, &oom_adjust);
1048 if (err)
723548bf 1049 goto out;
8ac773b4 1050 if ((oom_adjust < OOM_ADJUST_MIN || oom_adjust > OOM_ADJUST_MAX) &&
723548bf
DR		 1051 oom_adjust != OOM_DISABLE) {
1052 err = -EINVAL;
1053 goto out;
1054 }
5d863b89 1055
2fddfeef 1056 task = get_proc_task(file->f_path.dentry->d_inode);
723548bf
DR		 1057 if (!task) {
1058 err = -ESRCH;
1059 goto out;
1060 }
d19d5476
DR		 1061
1062 task_lock(task);
1063 if (!task->mm) {
1064 err = -EINVAL;
1065 goto err_task_lock;
1066 }
1067
28b83c51 1068 if (!lock_task_sighand(task, &flags)) {
723548bf 1069 err = -ESRCH;
d19d5476 1070 goto err_task_lock;
28b83c51
KM		 1071 }
1072
1073 if (oom_adjust < task->signal->oom_adj && !capable(CAP_SYS_RESOURCE)) {
723548bf
DR		 1074 err = -EACCES;
1075 goto err_sighand;
8fb4fc68 1076 }
28b83c51 1077
3d5992d2
YH		 1078 if (oom_adjust != task->signal->oom_adj) {
1079 if (oom_adjust == OOM_DISABLE)
1080 atomic_inc(&task->mm->oom_disable_count);
1081 if (task->signal->oom_adj == OOM_DISABLE)
1082 atomic_dec(&task->mm->oom_disable_count);
1083 }
1084
51b1bd2a
DR		 1085 /*
1086 * Warn that /proc/pid/oom_adj is deprecated, see
1087 * Documentation/feature-removal-schedule.txt.
1088 */
1089 printk_once(KERN_WARNING "%s (%d): /proc/%d/oom_adj is deprecated, "
1090 "please use /proc/%d/oom_score_adj instead.\n",
1091 current->comm, task_pid_nr(current),
1092 task_pid_nr(task), task_pid_nr(task));
28b83c51 1093 task->signal->oom_adj = oom_adjust;
a63d83f4
DR		 1094 /*
1095 * Scale /proc/pid/oom_score_adj appropriately ensuring that a maximum
1096 * value is always attainable.
1097 */
1098 if (task->signal->oom_adj == OOM_ADJUST_MAX)
1099 task->signal->oom_score_adj = OOM_SCORE_ADJ_MAX;
1100 else
1101 task->signal->oom_score_adj = (oom_adjust * OOM_SCORE_ADJ_MAX) /
1102 -OOM_DISABLE;
723548bf 1103err_sighand:
28b83c51 1104 unlock_task_sighand(task, &flags);
d19d5476
DR		 1105err_task_lock:
1106 task_unlock(task);
99f89551 1107 put_task_struct(task);
723548bf
DR		 1108out:
1109 return err < 0 ? err : count;
1da177e4
LT		 1110}
1111
00977a59 1112static const struct file_operations proc_oom_adjust_operations = {
1da177e4
LT		 1113 .read = oom_adjust_read,
1114 .write = oom_adjust_write,
87df8424 1115 .llseek = generic_file_llseek,
1da177e4
LT		 1116};
1117
a63d83f4
DR		 1118static ssize_t oom_score_adj_read(struct file *file, char __user *buf,
1119 size_t count, loff_t *ppos)
1120{
1121 struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode);
1122 char buffer[PROC_NUMBUF];
1123 int oom_score_adj = OOM_SCORE_ADJ_MIN;
1124 unsigned long flags;
1125 size_t len;
1126
1127 if (!task)
1128 return -ESRCH;
1129 if (lock_task_sighand(task, &flags)) {
1130 oom_score_adj = task->signal->oom_score_adj;
1131 unlock_task_sighand(task, &flags);
1132 }
1133 put_task_struct(task);
1134 len = snprintf(buffer, sizeof(buffer), "%d\n", oom_score_adj);
1135 return simple_read_from_buffer(buf, count, ppos, buffer, len);
1136}
1137
1138static ssize_t oom_score_adj_write(struct file *file, const char __user *buf,
1139 size_t count, loff_t *ppos)
1140{
1141 struct task_struct *task;
1142 char buffer[PROC_NUMBUF];
1143 unsigned long flags;
1144 long oom_score_adj;
1145 int err;
1146
1147 memset(buffer, 0, sizeof(buffer));
1148 if (count > sizeof(buffer) - 1)
1149 count = sizeof(buffer) - 1;
723548bf
DR		 1150 if (copy_from_user(buffer, buf, count)) {
1151 err = -EFAULT;
1152 goto out;
1153 }
a63d83f4
DR		 1154
1155 err = strict_strtol(strstrip(buffer), 0, &oom_score_adj);
1156 if (err)
723548bf 1157 goto out;
a63d83f4 1158 if (oom_score_adj < OOM_SCORE_ADJ_MIN ||
723548bf
DR		 1159 oom_score_adj > OOM_SCORE_ADJ_MAX) {
1160 err = -EINVAL;
1161 goto out;
1162 }
a63d83f4
DR		 1163
1164 task = get_proc_task(file->f_path.dentry->d_inode);
723548bf
DR		 1165 if (!task) {
1166 err = -ESRCH;
1167 goto out;
1168 }
d19d5476
DR		 1169
1170 task_lock(task);
1171 if (!task->mm) {
1172 err = -EINVAL;
1173 goto err_task_lock;
1174 }
1175
a63d83f4 1176 if (!lock_task_sighand(task, &flags)) {
723548bf 1177 err = -ESRCH;
d19d5476 1178 goto err_task_lock;
a63d83f4 1179 }
d19d5476 1180
dabb16f6 1181 if (oom_score_adj < task->signal->oom_score_adj_min &&
a63d83f4 1182 !capable(CAP_SYS_RESOURCE)) {
723548bf
DR		 1183 err = -EACCES;
1184 goto err_sighand;
a63d83f4
DR		 1185 }
1186
3d5992d2
YH		 1187 if (oom_score_adj != task->signal->oom_score_adj) {
1188 if (oom_score_adj == OOM_SCORE_ADJ_MIN)
1189 atomic_inc(&task->mm->oom_disable_count);
1190 if (task->signal->oom_score_adj == OOM_SCORE_ADJ_MIN)
1191 atomic_dec(&task->mm->oom_disable_count);
1192 }
a63d83f4 1193 task->signal->oom_score_adj = oom_score_adj;
dabb16f6
MSB		 1194 if (has_capability_noaudit(current, CAP_SYS_RESOURCE))
1195 task->signal->oom_score_adj_min = oom_score_adj;
a63d83f4
DR		 1196 /*
1197 * Scale /proc/pid/oom_adj appropriately ensuring that OOM_DISABLE is
1198 * always attainable.
1199 */
1200 if (task->signal->oom_score_adj == OOM_SCORE_ADJ_MIN)
1201 task->signal->oom_adj = OOM_DISABLE;
1202 else
1203 task->signal->oom_adj = (oom_score_adj * OOM_ADJUST_MAX) /
1204 OOM_SCORE_ADJ_MAX;
723548bf 1205err_sighand:
a63d83f4 1206 unlock_task_sighand(task, &flags);
d19d5476
DR		 1207err_task_lock:
1208 task_unlock(task);
a63d83f4 1209 put_task_struct(task);
723548bf
DR		 1210out:
1211 return err < 0 ? err : count;
a63d83f4
DR		 1212}
1213
1214static const struct file_operations proc_oom_score_adj_operations = {
1215 .read = oom_score_adj_read,
1216 .write = oom_score_adj_write,
6038f373 1217 .llseek = default_llseek,
a63d83f4
DR		 1218};
1219
1da177e4
LT		 1220#ifdef CONFIG_AUDITSYSCALL
1221#define TMPBUFLEN 21
1222static ssize_t proc_loginuid_read(struct file * file, char __user * buf,
1223 size_t count, loff_t *ppos)
1224{
2fddfeef 1225 struct inode * inode = file->f_path.dentry->d_inode;
99f89551 1226 struct task_struct *task = get_proc_task(inode);
1da177e4
LT		 1227 ssize_t length;
1228 char tmpbuf[TMPBUFLEN];
1229
99f89551
EB		 1230 if (!task)
1231 return -ESRCH;
1da177e4 1232 length = scnprintf(tmpbuf, TMPBUFLEN, "%u",
0c11b942 1233 audit_get_loginuid(task));
99f89551 1234 put_task_struct(task);
1da177e4
LT		 1235 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1236}
1237
1238static ssize_t proc_loginuid_write(struct file * file, const char __user * buf,
1239 size_t count, loff_t *ppos)
1240{
2fddfeef 1241 struct inode * inode = file->f_path.dentry->d_inode;
1da177e4
LT		 1242 char *page, *tmp;
1243 ssize_t length;
1da177e4
LT		 1244 uid_t loginuid;
1245
1246 if (!capable(CAP_AUDIT_CONTROL))
1247 return -EPERM;
1248
7dc52157
PM		 1249 rcu_read_lock();
1250 if (current != pid_task(proc_pid(inode), PIDTYPE_PID)) {
1251 rcu_read_unlock();
1da177e4 1252 return -EPERM;
7dc52157
PM		 1253 }
1254 rcu_read_unlock();
1da177e4 1255
e0182909
AV		 1256 if (count >= PAGE_SIZE)
1257 count = PAGE_SIZE - 1;
1da177e4
LT		 1258
1259 if (*ppos != 0) {
1260 /* No partial writes. */
1261 return -EINVAL;
1262 }
e12ba74d 1263 page = (char*)__get_free_page(GFP_TEMPORARY);
1da177e4
LT		 1264 if (!page)
1265 return -ENOMEM;
1266 length = -EFAULT;
1267 if (copy_from_user(page, buf, count))
1268 goto out_free_page;
1269
e0182909 1270 page[count] = '\0';
1da177e4
LT		 1271 loginuid = simple_strtoul(page, &tmp, 10);
1272 if (tmp == page) {
1273 length = -EINVAL;
1274 goto out_free_page;
1275
1276 }
99f89551 1277 length = audit_set_loginuid(current, loginuid);
1da177e4
LT		 1278 if (likely(length == 0))
1279 length = count;
1280
1281out_free_page:
1282 free_page((unsigned long) page);
1283 return length;
1284}
1285
00977a59 1286static const struct file_operations proc_loginuid_operations = {
1da177e4
LT		 1287 .read = proc_loginuid_read,
1288 .write = proc_loginuid_write,
87df8424 1289 .llseek = generic_file_llseek,
1da177e4 1290};
1e0bd755
EP		 1291
1292static ssize_t proc_sessionid_read(struct file * file, char __user * buf,
1293 size_t count, loff_t *ppos)
1294{
1295 struct inode * inode = file->f_path.dentry->d_inode;
1296 struct task_struct *task = get_proc_task(inode);
1297 ssize_t length;
1298 char tmpbuf[TMPBUFLEN];
1299
1300 if (!task)
1301 return -ESRCH;
1302 length = scnprintf(tmpbuf, TMPBUFLEN, "%u",
1303 audit_get_sessionid(task));
1304 put_task_struct(task);
1305 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1306}
1307
1308static const struct file_operations proc_sessionid_operations = {
1309 .read = proc_sessionid_read,
87df8424 1310 .llseek = generic_file_llseek,
1e0bd755 1311};
1da177e4
LT		 1312#endif
1313
f4f154fd
AM		 1314#ifdef CONFIG_FAULT_INJECTION
1315static ssize_t proc_fault_inject_read(struct file * file, char __user * buf,
1316 size_t count, loff_t *ppos)
1317{
1318 struct task_struct *task = get_proc_task(file->f_dentry->d_inode);
1319 char buffer[PROC_NUMBUF];
1320 size_t len;
1321 int make_it_fail;
f4f154fd
AM		 1322
1323 if (!task)
1324 return -ESRCH;
1325 make_it_fail = task->make_it_fail;
1326 put_task_struct(task);
1327
1328 len = snprintf(buffer, sizeof(buffer), "%i\n", make_it_fail);
0c28f287
AM		 1329
1330 return simple_read_from_buffer(buf, count, ppos, buffer, len);
f4f154fd
AM		 1331}
1332
1333static ssize_t proc_fault_inject_write(struct file * file,
1334 const char __user * buf, size_t count, loff_t *ppos)
1335{
1336 struct task_struct *task;
1337 char buffer[PROC_NUMBUF], *end;
1338 int make_it_fail;
1339
1340 if (!capable(CAP_SYS_RESOURCE))
1341 return -EPERM;
1342 memset(buffer, 0, sizeof(buffer));
1343 if (count > sizeof(buffer) - 1)
1344 count = sizeof(buffer) - 1;
1345 if (copy_from_user(buffer, buf, count))
1346 return -EFAULT;
cba8aafe
VL		 1347 make_it_fail = simple_strtol(strstrip(buffer), &end, 0);
1348 if (*end)
1349 return -EINVAL;
f4f154fd
AM		 1350 task = get_proc_task(file->f_dentry->d_inode);
1351 if (!task)
1352 return -ESRCH;
1353 task->make_it_fail = make_it_fail;
1354 put_task_struct(task);
cba8aafe
VL		 1355
1356 return count;
f4f154fd
AM		 1357}
1358
00977a59 1359static const struct file_operations proc_fault_inject_operations = {
f4f154fd
AM		 1360 .read = proc_fault_inject_read,
1361 .write = proc_fault_inject_write,
87df8424 1362 .llseek = generic_file_llseek,
f4f154fd
AM		 1363};
1364#endif
1365
9745512c 1366
43ae34cb
IM		 1367#ifdef CONFIG_SCHED_DEBUG
1368/*
1369 * Print out various scheduling related per-task fields:
1370 */
1371static int sched_show(struct seq_file *m, void *v)
1372{
1373 struct inode *inode = m->private;
1374 struct task_struct *p;
1375
43ae34cb
IM		 1376 p = get_proc_task(inode);
1377 if (!p)
1378 return -ESRCH;
1379 proc_sched_show_task(p, m);
1380
1381 put_task_struct(p);
1382
1383 return 0;
1384}
1385
1386static ssize_t
1387sched_write(struct file *file, const char __user *buf,
1388 size_t count, loff_t *offset)
1389{
1390 struct inode *inode = file->f_path.dentry->d_inode;
1391 struct task_struct *p;
1392
43ae34cb
IM		 1393 p = get_proc_task(inode);
1394 if (!p)
1395 return -ESRCH;
1396 proc_sched_set_task(p);
1397
1398 put_task_struct(p);
1399
1400 return count;
1401}
1402
1403static int sched_open(struct inode *inode, struct file *filp)
1404{
c6a34058 1405 return single_open(filp, sched_show, inode);
43ae34cb
IM		 1406}
1407
1408static const struct file_operations proc_pid_sched_operations = {
1409 .open = sched_open,
1410 .read = seq_read,
1411 .write = sched_write,
1412 .llseek = seq_lseek,
5ea473a1 1413 .release = single_release,
43ae34cb
IM		 1414};
1415
1416#endif
1417
5091faa4
MG		 1418#ifdef CONFIG_SCHED_AUTOGROUP
1419/*
1420 * Print out autogroup related information:
1421 */
1422static int sched_autogroup_show(struct seq_file *m, void *v)
1423{
1424 struct inode *inode = m->private;
1425 struct task_struct *p;
1426
1427 p = get_proc_task(inode);
1428 if (!p)
1429 return -ESRCH;
1430 proc_sched_autogroup_show_task(p, m);
1431
1432 put_task_struct(p);
1433
1434 return 0;
1435}
1436
1437static ssize_t
1438sched_autogroup_write(struct file *file, const char __user *buf,
1439 size_t count, loff_t *offset)
1440{
1441 struct inode *inode = file->f_path.dentry->d_inode;
1442 struct task_struct *p;
1443 char buffer[PROC_NUMBUF];
1444 long nice;
1445 int err;
1446
1447 memset(buffer, 0, sizeof(buffer));
1448 if (count > sizeof(buffer) - 1)
1449 count = sizeof(buffer) - 1;
1450 if (copy_from_user(buffer, buf, count))
1451 return -EFAULT;
1452
1453 err = strict_strtol(strstrip(buffer), 0, &nice);
1454 if (err)
1455 return -EINVAL;
1456
1457 p = get_proc_task(inode);
1458 if (!p)
1459 return -ESRCH;
1460
1461 err = nice;
1462 err = proc_sched_autogroup_set_nice(p, &err);
1463 if (err)
1464 count = err;
1465
1466 put_task_struct(p);
1467
1468 return count;
1469}
1470
1471static int sched_autogroup_open(struct inode *inode, struct file *filp)
1472{
1473 int ret;
1474
1475 ret = single_open(filp, sched_autogroup_show, NULL);
1476 if (!ret) {
1477 struct seq_file *m = filp->private_data;
1478
1479 m->private = inode;
1480 }
1481 return ret;
1482}
1483
1484static const struct file_operations proc_pid_sched_autogroup_operations = {
1485 .open = sched_autogroup_open,
1486 .read = seq_read,
1487 .write = sched_autogroup_write,
1488 .llseek = seq_lseek,
1489 .release = single_release,
1490};
1491
1492#endif /* CONFIG_SCHED_AUTOGROUP */
1493
4614a696
JS		 1494static ssize_t comm_write(struct file *file, const char __user *buf,
1495 size_t count, loff_t *offset)
1496{
1497 struct inode *inode = file->f_path.dentry->d_inode;
1498 struct task_struct *p;
1499 char buffer[TASK_COMM_LEN];
1500
1501 memset(buffer, 0, sizeof(buffer));
1502 if (count > sizeof(buffer) - 1)
1503 count = sizeof(buffer) - 1;
1504 if (copy_from_user(buffer, buf, count))
1505 return -EFAULT;
1506
1507 p = get_proc_task(inode);
1508 if (!p)
1509 return -ESRCH;
1510
1511 if (same_thread_group(current, p))
1512 set_task_comm(p, buffer);
1513 else
1514 count = -EINVAL;
1515
1516 put_task_struct(p);
1517
1518 return count;
1519}
1520
1521static int comm_show(struct seq_file *m, void *v)
1522{
1523 struct inode *inode = m->private;
1524 struct task_struct *p;
1525
1526 p = get_proc_task(inode);
1527 if (!p)
1528 return -ESRCH;
1529
1530 task_lock(p);
1531 seq_printf(m, "%s\n", p->comm);
1532 task_unlock(p);
1533
1534 put_task_struct(p);
1535
1536 return 0;
1537}
1538
1539static int comm_open(struct inode *inode, struct file *filp)
1540{
c6a34058 1541 return single_open(filp, comm_show, inode);
4614a696
JS		 1542}
1543
1544static const struct file_operations proc_pid_set_comm_operations = {
1545 .open = comm_open,
1546 .read = seq_read,
1547 .write = comm_write,
1548 .llseek = seq_lseek,
1549 .release = single_release,
1550};
1551
925d1c40
MH		 1552/*
1553 * We added or removed a vma mapping the executable. The vmas are only mapped
1554 * during exec and are not mapped with the mmap system call.
1555 * Callers must hold down_write() on the mm's mmap_sem for these
1556 */
1557void added_exe_file_vma(struct mm_struct *mm)
1558{
1559 mm->num_exe_file_vmas++;
1560}
1561
1562void removed_exe_file_vma(struct mm_struct *mm)
1563{
1564 mm->num_exe_file_vmas--;
1565 if ((mm->num_exe_file_vmas == 0) && mm->exe_file){
1566 fput(mm->exe_file);
1567 mm->exe_file = NULL;
1568 }
1569
1570}
1571
1572void set_mm_exe_file(struct mm_struct *mm, struct file *new_exe_file)
1573{
1574 if (new_exe_file)
1575 get_file(new_exe_file);
1576 if (mm->exe_file)
1577 fput(mm->exe_file);
1578 mm->exe_file = new_exe_file;
1579 mm->num_exe_file_vmas = 0;
1580}
1581
1582struct file *get_mm_exe_file(struct mm_struct *mm)
1583{
1584 struct file *exe_file;
1585
1586 /* We need mmap_sem to protect against races with removal of
1587 * VM_EXECUTABLE vmas */
1588 down_read(&mm->mmap_sem);
1589 exe_file = mm->exe_file;
1590 if (exe_file)
1591 get_file(exe_file);
1592 up_read(&mm->mmap_sem);
1593 return exe_file;
1594}
1595
1596void dup_mm_exe_file(struct mm_struct *oldmm, struct mm_struct *newmm)
1597{
1598 /* It's safe to write the exe_file pointer without exe_file_lock because
1599 * this is called during fork when the task is not yet in /proc */
1600 newmm->exe_file = get_mm_exe_file(oldmm);
1601}
1602
1603static int proc_exe_link(struct inode *inode, struct path *exe_path)
1604{
1605 struct task_struct *task;
1606 struct mm_struct *mm;
1607 struct file *exe_file;
1608
1609 task = get_proc_task(inode);
1610 if (!task)
1611 return -ENOENT;
1612 mm = get_task_mm(task);
1613 put_task_struct(task);
1614 if (!mm)
1615 return -ENOENT;
1616 exe_file = get_mm_exe_file(mm);
1617 mmput(mm);
1618 if (exe_file) {
1619 *exe_path = exe_file->f_path;
1620 path_get(&exe_file->f_path);
1621 fput(exe_file);
1622 return 0;
1623 } else
1624 return -ENOENT;
1625}
1626
008b150a 1627static void *proc_pid_follow_link(struct dentry *dentry, struct nameidata *nd)
1da177e4
LT		 1628{
1629 struct inode *inode = dentry->d_inode;
1630 int error = -EACCES;
1631
1632 /* We don't need a base pointer in the /proc filesystem */
1d957f9b 1633 path_put(&nd->path);
1da177e4 1634
778c1144
EB		 1635 /* Are we allowed to snoop on the tasks file descriptors? */
1636 if (!proc_fd_access_allowed(inode))
1da177e4 1637 goto out;
1da177e4 1638
3dcd25f3 1639 error = PROC_I(inode)->op.proc_get_link(inode, &nd->path);
1da177e4 1640out:
008b150a 1641 return ERR_PTR(error);
1da177e4
LT		 1642}
1643
3dcd25f3 1644static int do_proc_readlink(struct path *path, char __user *buffer, int buflen)
1da177e4 1645{
e12ba74d 1646 char *tmp = (char*)__get_free_page(GFP_TEMPORARY);
3dcd25f3 1647 char *pathname;
1da177e4
LT		 1648 int len;
1649
1650 if (!tmp)
1651 return -ENOMEM;
0c28f287 1652
7b2a69ba 1653 pathname = d_path(path, tmp, PAGE_SIZE);
3dcd25f3
JB		 1654 len = PTR_ERR(pathname);
1655 if (IS_ERR(pathname))
1da177e4 1656 goto out;
3dcd25f3 1657 len = tmp + PAGE_SIZE - 1 - pathname;
1da177e4
LT		 1658
1659 if (len > buflen)
1660 len = buflen;
3dcd25f3 1661 if (copy_to_user(buffer, pathname, len))
1da177e4
LT		 1662 len = -EFAULT;
1663 out:
1664 free_page((unsigned long)tmp);
1665 return len;
1666}
1667
1668static int proc_pid_readlink(struct dentry * dentry, char __user * buffer, int buflen)
1669{
1670 int error = -EACCES;
1671 struct inode *inode = dentry->d_inode;
3dcd25f3 1672 struct path path;
1da177e4 1673
778c1144
EB		 1674 /* Are we allowed to snoop on the tasks file descriptors? */
1675 if (!proc_fd_access_allowed(inode))
1da177e4 1676 goto out;
1da177e4 1677
3dcd25f3 1678 error = PROC_I(inode)->op.proc_get_link(inode, &path);
1da177e4
LT		 1679 if (error)
1680 goto out;
1681
3dcd25f3
JB		 1682 error = do_proc_readlink(&path, buffer, buflen);
1683 path_put(&path);
1da177e4 1684out:
1da177e4
LT		 1685 return error;
1686}
1687
c5ef1c42 1688static const struct inode_operations proc_pid_link_inode_operations = {
1da177e4 1689 .readlink = proc_pid_readlink,
6d76fa58
LT		 1690 .follow_link = proc_pid_follow_link,
1691 .setattr = proc_setattr,
1da177e4
LT		 1692};
1693
28a6d671
EB		 1694
1695/* building an inode */
1696
1697static int task_dumpable(struct task_struct *task)
1da177e4 1698{
28a6d671
EB		 1699 int dumpable = 0;
1700 struct mm_struct *mm;
1da177e4 1701
28a6d671
EB		 1702 task_lock(task);
1703 mm = task->mm;
1704 if (mm)
6c5d5238 1705 dumpable = get_dumpable(mm);
28a6d671
EB		 1706 task_unlock(task);
1707 if(dumpable == 1)
1708 return 1;
1709 return 0;
1710}
1da177e4 1711
1da177e4 1712
61a28784 1713static struct inode *proc_pid_make_inode(struct super_block * sb, struct task_struct *task)
28a6d671
EB		 1714{
1715 struct inode * inode;
1716 struct proc_inode *ei;
c69e8d9c 1717 const struct cred *cred;
1da177e4 1718
28a6d671 1719 /* We need a new inode */
1da177e4 1720
28a6d671
EB		 1721 inode = new_inode(sb);
1722 if (!inode)
1723 goto out;
1724
1725 /* Common stuff */
1726 ei = PROC_I(inode);
85fe4025 1727 inode->i_ino = get_next_ino();
28a6d671 1728 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
28a6d671
EB		 1729 inode->i_op = &proc_def_inode_operations;
1730
1731 /*
1732 * grab the reference to task.
1733 */
1a657f78 1734 ei->pid = get_task_pid(task, PIDTYPE_PID);
28a6d671
EB		 1735 if (!ei->pid)
1736 goto out_unlock;
1737
28a6d671 1738 if (task_dumpable(task)) {
c69e8d9c
DH		 1739 rcu_read_lock();
1740 cred = __task_cred(task);
1741 inode->i_uid = cred->euid;
1742 inode->i_gid = cred->egid;
1743 rcu_read_unlock();
1da177e4 1744 }
28a6d671
EB		 1745 security_task_to_inode(task, inode);
1746
1da177e4 1747out:
28a6d671
EB		 1748 return inode;
1749
1750out_unlock:
1751 iput(inode);
1752 return NULL;
1da177e4
LT		 1753}
1754
28a6d671 1755static int pid_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
1da177e4 1756{
1da177e4 1757 struct inode *inode = dentry->d_inode;
28a6d671 1758 struct task_struct *task;
c69e8d9c
DH		 1759 const struct cred *cred;
1760
28a6d671 1761 generic_fillattr(inode, stat);
1da177e4 1762
28a6d671
EB		 1763 rcu_read_lock();
1764 stat->uid = 0;
1765 stat->gid = 0;
1766 task = pid_task(proc_pid(inode), PIDTYPE_PID);
1767 if (task) {
1768 if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) ||
1769 task_dumpable(task)) {
c69e8d9c
DH		 1770 cred = __task_cred(task);
1771 stat->uid = cred->euid;
1772 stat->gid = cred->egid;
1da177e4
LT		 1773 }
1774 }
28a6d671 1775 rcu_read_unlock();
d6e71144 1776 return 0;
1da177e4
LT		 1777}
1778
1da177e4
LT		 1779/* dentry stuff */
1780
1781/*
1782 * Exceptional case: normally we are not allowed to unhash a busy
1783 * directory. In this case, however, we can do it - no aliasing problems
1784 * due to the way we treat inodes.
1785 *
1786 * Rewrite the inode's ownerships here because the owning task may have
1787 * performed a setuid(), etc.
99f89551
EB		 1788 *
1789 * Before the /proc/pid/status file was created the only way to read
1790 * the effective uid of a /process was to stat /proc/pid. Reading
1791 * /proc/pid/status is slow enough that procps and other packages
1792 * kept stating /proc/pid. To keep the rules in /proc simple I have
1793 * made this apply to all per process world readable and executable
1794 * directories.
1da177e4
LT		 1795 */
1796static int pid_revalidate(struct dentry *dentry, struct nameidata *nd)
1797{
34286d66
NP		 1798 struct inode *inode;
1799 struct task_struct *task;
c69e8d9c
DH		 1800 const struct cred *cred;
1801
34286d66
NP		 1802 if (nd && nd->flags & LOOKUP_RCU)
1803 return -ECHILD;
1804
1805 inode = dentry->d_inode;
1806 task = get_proc_task(inode);
1807
99f89551
EB		 1808 if (task) {
1809 if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) ||
1810 task_dumpable(task)) {
c69e8d9c
DH		 1811 rcu_read_lock();
1812 cred = __task_cred(task);
1813 inode->i_uid = cred->euid;
1814 inode->i_gid = cred->egid;
1815 rcu_read_unlock();
1da177e4
LT		 1816 } else {
1817 inode->i_uid = 0;
1818 inode->i_gid = 0;
1819 }
9ee8ab9f 1820 inode->i_mode &= ~(S_ISUID | S_ISGID);
1da177e4 1821 security_task_to_inode(task, inode);
99f89551 1822 put_task_struct(task);
1da177e4
LT		 1823 return 1;
1824 }
1825 d_drop(dentry);
1826 return 0;
1827}
1828
fe15ce44 1829static int pid_delete_dentry(const struct dentry * dentry)
99f89551 1830{
28a6d671
EB		 1831 /* Is the task we represent dead?
1832 * If so, then don't put the dentry on the lru list,
1833 * kill it immediately.
1834 */
1835 return !proc_pid(dentry->d_inode)->tasks[PIDTYPE_PID].first;
1836}
1837
d72f71eb 1838static const struct dentry_operations pid_dentry_operations =
28a6d671
EB		 1839{
1840 .d_revalidate = pid_revalidate,
1841 .d_delete = pid_delete_dentry,
1842};
1843
1844/* Lookups */
1845
c5141e6d
ED		 1846typedef struct dentry *instantiate_t(struct inode *, struct dentry *,
1847 struct task_struct *, const void *);
61a28784 1848
1c0d04c9
EB		 1849/*
1850 * Fill a directory entry.
1851 *
1852 * If possible create the dcache entry and derive our inode number and
1853 * file type from dcache entry.
1854 *
1855 * Since all of the proc inode numbers are dynamically generated, the inode
1856 * numbers do not exist until the inode is cache. This means creating the
1857 * the dcache entry in readdir is necessary to keep the inode numbers
1858 * reported by readdir in sync with the inode numbers reported
1859 * by stat.
1860 */
61a28784
EB		 1861static int proc_fill_cache(struct file *filp, void *dirent, filldir_t filldir,
1862 char *name, int len,
c5141e6d 1863 instantiate_t instantiate, struct task_struct *task, const void *ptr)
61a28784 1864{
2fddfeef 1865 struct dentry *child, *dir = filp->f_path.dentry;
61a28784
EB		 1866 struct inode *inode;
1867 struct qstr qname;
1868 ino_t ino = 0;
1869 unsigned type = DT_UNKNOWN;
1870
1871 qname.name = name;
1872 qname.len = len;
1873 qname.hash = full_name_hash(name, len);
1874
1875 child = d_lookup(dir, &qname);
1876 if (!child) {
1877 struct dentry *new;
1878 new = d_alloc(dir, &qname);
1879 if (new) {
1880 child = instantiate(dir->d_inode, new, task, ptr);
1881 if (child)
1882 dput(new);
1883 else
1884 child = new;
1885 }
1886 }
1887 if (!child || IS_ERR(child) || !child->d_inode)
1888 goto end_instantiate;
1889 inode = child->d_inode;
1890 if (inode) {
1891 ino = inode->i_ino;
1892 type = inode->i_mode >> 12;
1893 }
1894 dput(child);
1895end_instantiate:
1896 if (!ino)
1897 ino = find_inode_number(dir, &qname);
1898 if (!ino)
1899 ino = 1;
1900 return filldir(dirent, name, len, filp->f_pos, ino, type);
1901}
1902
28a6d671
EB		 1903static unsigned name_to_int(struct dentry *dentry)
1904{
1905 const char *name = dentry->d_name.name;
1906 int len = dentry->d_name.len;
1907 unsigned n = 0;
1908
1909 if (len > 1 && *name == '0')
1910 goto out;
1911 while (len-- > 0) {
1912 unsigned c = *name++ - '0';
1913 if (c > 9)
1914 goto out;
1915 if (n >= (~0U-9)/10)
1916 goto out;
1917 n *= 10;
1918 n += c;
1919 }
1920 return n;
1921out:
1922 return ~0U;
1923}
1924
27932742
MS		 1925#define PROC_FDINFO_MAX 64
1926
3dcd25f3 1927static int proc_fd_info(struct inode *inode, struct path *path, char *info)
28a6d671
EB		 1928{
1929 struct task_struct *task = get_proc_task(inode);
1930 struct files_struct *files = NULL;
1931 struct file *file;
1932 int fd = proc_fd(inode);
99f89551 1933
99f89551 1934 if (task) {
28a6d671
EB		 1935 files = get_files_struct(task);
1936 put_task_struct(task);
1937 }
1938 if (files) {
1939 /*
1940 * We are not taking a ref to the file structure, so we must
1941 * hold ->file_lock.
1942 */
1943 spin_lock(&files->file_lock);
1944 file = fcheck_files(files, fd);
1945 if (file) {
3dcd25f3
JB		 1946 if (path) {
1947 *path = file->f_path;
1948 path_get(&file->f_path);
1949 }
27932742
MS		 1950 if (info)
1951 snprintf(info, PROC_FDINFO_MAX,
1952 "pos:\t%lli\n"
1953 "flags:\t0%o\n",
1954 (long long) file->f_pos,
1955 file->f_flags);
28a6d671
EB		 1956 spin_unlock(&files->file_lock);
1957 put_files_struct(files);
1958 return 0;
99f89551 1959 }
28a6d671
EB		 1960 spin_unlock(&files->file_lock);
1961 put_files_struct(files);
99f89551 1962 }
28a6d671 1963 return -ENOENT;
99f89551
EB		 1964}
1965
3dcd25f3 1966static int proc_fd_link(struct inode *inode, struct path *path)
27932742 1967{
3dcd25f3 1968 return proc_fd_info(inode, path, NULL);
27932742
MS		 1969}
1970
1da177e4
LT		 1971static int tid_fd_revalidate(struct dentry *dentry, struct nameidata *nd)
1972{
34286d66
NP		 1973 struct inode *inode;
1974 struct task_struct *task;
1975 int fd;
1da177e4 1976 struct files_struct *files;
c69e8d9c 1977 const struct cred *cred;
1da177e4 1978
34286d66
NP		 1979 if (nd && nd->flags & LOOKUP_RCU)
1980 return -ECHILD;
1981
1982 inode = dentry->d_inode;
1983 task = get_proc_task(inode);
1984 fd = proc_fd(inode);
1985
99f89551
EB		 1986 if (task) {
1987 files = get_files_struct(task);
1988 if (files) {
1989 rcu_read_lock();
1990 if (fcheck_files(files, fd)) {
1991 rcu_read_unlock();
1992 put_files_struct(files);
1993 if (task_dumpable(task)) {
c69e8d9c
DH		 1994 rcu_read_lock();
1995 cred = __task_cred(task);
1996 inode->i_uid = cred->euid;
1997 inode->i_gid = cred->egid;
1998 rcu_read_unlock();
99f89551
EB		 1999 } else {
2000 inode->i_uid = 0;
2001 inode->i_gid = 0;
2002 }
9ee8ab9f 2003 inode->i_mode &= ~(S_ISUID | S_ISGID);
99f89551
EB		 2004 security_task_to_inode(task, inode);
2005 put_task_struct(task);
2006 return 1;
2007 }
b835996f 2008 rcu_read_unlock();
1da177e4 2009 put_files_struct(files);
1da177e4 2010 }
99f89551 2011 put_task_struct(task);
1da177e4
LT		 2012 }
2013 d_drop(dentry);
2014 return 0;
2015}
2016
d72f71eb 2017static const struct dentry_operations tid_fd_dentry_operations =
1da177e4
LT		 2018{
2019 .d_revalidate = tid_fd_revalidate,
2020 .d_delete = pid_delete_dentry,
2021};
2022
444ceed8 2023static struct dentry *proc_fd_instantiate(struct inode *dir,
c5141e6d 2024 struct dentry *dentry, struct task_struct *task, const void *ptr)
1da177e4 2025{
c5141e6d 2026 unsigned fd = *(const unsigned *)ptr;
444ceed8
EB		 2027 struct file *file;
2028 struct files_struct *files;
2029 struct inode *inode;
2030 struct proc_inode *ei;
2031 struct dentry *error = ERR_PTR(-ENOENT);
1da177e4 2032
61a28784 2033 inode = proc_pid_make_inode(dir->i_sb, task);
1da177e4
LT		 2034 if (!inode)
2035 goto out;
2036 ei = PROC_I(inode);
aed7a6c4 2037 ei->fd = fd;
1da177e4
LT		 2038 files = get_files_struct(task);
2039 if (!files)
444ceed8 2040 goto out_iput;
1da177e4 2041 inode->i_mode = S_IFLNK;
ca99c1da
DS		 2042
2043 /*
2044 * We are not taking a ref to the file structure, so we must
2045 * hold ->file_lock.
2046 */
2047 spin_lock(&files->file_lock);
1da177e4
LT		 2048 file = fcheck_files(files, fd);
2049 if (!file)
444ceed8 2050 goto out_unlock;
aeb5d727 2051 if (file->f_mode & FMODE_READ)
1da177e4 2052 inode->i_mode |= S_IRUSR | S_IXUSR;
aeb5d727 2053 if (file->f_mode & FMODE_WRITE)
1da177e4 2054 inode->i_mode |= S_IWUSR | S_IXUSR;
ca99c1da 2055 spin_unlock(&files->file_lock);
1da177e4 2056 put_files_struct(files);
444ceed8 2057
1da177e4
LT		 2058 inode->i_op = &proc_pid_link_inode_operations;
2059 inode->i_size = 64;
2060 ei->op.proc_get_link = proc_fd_link;
fb045adb 2061 d_set_d_op(dentry, &tid_fd_dentry_operations);
1da177e4 2062 d_add(dentry, inode);
cd6a3ce9
EB		 2063 /* Close the race of the process dying before we return the dentry */
2064 if (tid_fd_revalidate(dentry, NULL))
444ceed8 2065 error = NULL;
1da177e4 2066
444ceed8
EB		 2067 out:
2068 return error;
2069out_unlock:
ca99c1da 2070 spin_unlock(&files->file_lock);
1da177e4 2071 put_files_struct(files);
444ceed8 2072out_iput:
1da177e4 2073 iput(inode);
cd6a3ce9 2074 goto out;
1da177e4
LT		 2075}
2076
27932742
MS		 2077static struct dentry *proc_lookupfd_common(struct inode *dir,
2078 struct dentry *dentry,
2079 instantiate_t instantiate)
444ceed8
EB		 2080{
2081 struct task_struct *task = get_proc_task(dir);
2082 unsigned fd = name_to_int(dentry);
2083 struct dentry *result = ERR_PTR(-ENOENT);
2084
2085 if (!task)
2086 goto out_no_task;
2087 if (fd == ~0U)
2088 goto out;
2089
27932742 2090 result = instantiate(dir, dentry, task, &fd);
444ceed8
EB		 2091out:
2092 put_task_struct(task);
2093out_no_task:
2094 return result;
2095}
2096
27932742
MS		 2097static int proc_readfd_common(struct file * filp, void * dirent,
2098 filldir_t filldir, instantiate_t instantiate)
28a6d671 2099{
2fddfeef 2100 struct dentry *dentry = filp->f_path.dentry;
28a6d671
EB		 2101 struct inode *inode = dentry->d_inode;
2102 struct task_struct *p = get_proc_task(inode);
457c2510 2103 unsigned int fd, ino;
28a6d671 2104 int retval;
28a6d671 2105 struct files_struct * files;
1da177e4 2106
28a6d671
EB		 2107 retval = -ENOENT;
2108 if (!p)
2109 goto out_no_task;
2110 retval = 0;
28a6d671
EB		 2111
2112 fd = filp->f_pos;
2113 switch (fd) {
2114 case 0:
2115 if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0)
2116 goto out;
2117 filp->f_pos++;
2118 case 1:
2119 ino = parent_ino(dentry);
2120 if (filldir(dirent, "..", 2, 1, ino, DT_DIR) < 0)
2121 goto out;
2122 filp->f_pos++;
2123 default:
2124 files = get_files_struct(p);
2125 if (!files)
2126 goto out;
2127 rcu_read_lock();
28a6d671 2128 for (fd = filp->f_pos-2;
9b4f526c 2129 fd < files_fdtable(files)->max_fds;
28a6d671 2130 fd++, filp->f_pos++) {
27932742
MS		 2131 char name[PROC_NUMBUF];
2132 int len;
28a6d671
EB		 2133
2134 if (!fcheck_files(files, fd))
2135 continue;
2136 rcu_read_unlock();
2137
27932742
MS		 2138 len = snprintf(name, sizeof(name), "%d", fd);
2139 if (proc_fill_cache(filp, dirent, filldir,
2140 name, len, instantiate,
2141 p, &fd) < 0) {
28a6d671
EB		 2142 rcu_read_lock();
2143 break;
2144 }
2145 rcu_read_lock();
2146 }
2147 rcu_read_unlock();
2148 put_files_struct(files);
2149 }
2150out:
2151 put_task_struct(p);
2152out_no_task:
2153 return retval;
2154}
2155
27932742
MS		 2156static struct dentry *proc_lookupfd(struct inode *dir, struct dentry *dentry,
2157 struct nameidata *nd)
2158{
2159 return proc_lookupfd_common(dir, dentry, proc_fd_instantiate);
2160}
2161
2162static int proc_readfd(struct file *filp, void *dirent, filldir_t filldir)
2163{
2164 return proc_readfd_common(filp, dirent, filldir, proc_fd_instantiate);
2165}
2166
2167static ssize_t proc_fdinfo_read(struct file *file, char __user *buf,
2168 size_t len, loff_t *ppos)
2169{
2170 char tmp[PROC_FDINFO_MAX];
3dcd25f3 2171 int err = proc_fd_info(file->f_path.dentry->d_inode, NULL, tmp);
27932742
MS		 2172 if (!err)
2173 err = simple_read_from_buffer(buf, len, ppos, tmp, strlen(tmp));
2174 return err;
2175}
2176
2177static const struct file_operations proc_fdinfo_file_operations = {
87df8424 2178 .open = nonseekable_open,
27932742 2179 .read = proc_fdinfo_read,
6038f373 2180 .llseek = no_llseek,
27932742
MS		 2181};
2182
00977a59 2183static const struct file_operations proc_fd_operations = {
28a6d671
EB		 2184 .read = generic_read_dir,
2185 .readdir = proc_readfd,
6038f373 2186 .llseek = default_llseek,
1da177e4
LT		 2187};
2188
8948e11f
AD		 2189/*
2190 * /proc/pid/fd needs a special permission handler so that a process can still
2191 * access /proc/self/fd after it has executed a setuid().
2192 */
b74c79e9 2193static int proc_fd_permission(struct inode *inode, int mask, unsigned int flags)
8948e11f
AD		 2194{
2195 int rv;
2196
b74c79e9
NP		 2197 if (flags & IPERM_FLAG_RCU)
2198 return -ECHILD;
2199 rv = generic_permission(inode, mask, flags, NULL);
8948e11f
AD		 2200 if (rv == 0)
2201 return 0;
2202 if (task_pid(current) == proc_pid(inode))
2203 rv = 0;
2204 return rv;
2205}
2206
1da177e4
LT		 2207/*
2208 * proc directories can do almost nothing..
2209 */
c5ef1c42 2210static const struct inode_operations proc_fd_inode_operations = {
1da177e4 2211 .lookup = proc_lookupfd,
8948e11f 2212 .permission = proc_fd_permission,
6d76fa58 2213 .setattr = proc_setattr,
1da177e4
LT		 2214};
2215
27932742
MS		 2216static struct dentry *proc_fdinfo_instantiate(struct inode *dir,
2217 struct dentry *dentry, struct task_struct *task, const void *ptr)
2218{
2219 unsigned fd = *(unsigned *)ptr;
2220 struct inode *inode;
2221 struct proc_inode *ei;
2222 struct dentry *error = ERR_PTR(-ENOENT);
2223
2224 inode = proc_pid_make_inode(dir->i_sb, task);
2225 if (!inode)
2226 goto out;
2227 ei = PROC_I(inode);
2228 ei->fd = fd;
2229 inode->i_mode = S_IFREG | S_IRUSR;
2230 inode->i_fop = &proc_fdinfo_file_operations;
fb045adb 2231 d_set_d_op(dentry, &tid_fd_dentry_operations);
27932742
MS		 2232 d_add(dentry, inode);
2233 /* Close the race of the process dying before we return the dentry */
2234 if (tid_fd_revalidate(dentry, NULL))
2235 error = NULL;
2236
2237 out:
2238 return error;
2239}
2240
2241static struct dentry *proc_lookupfdinfo(struct inode *dir,
2242 struct dentry *dentry,
2243 struct nameidata *nd)
2244{
2245 return proc_lookupfd_common(dir, dentry, proc_fdinfo_instantiate);
2246}
2247
2248static int proc_readfdinfo(struct file *filp, void *dirent, filldir_t filldir)
2249{
2250 return proc_readfd_common(filp, dirent, filldir,
2251 proc_fdinfo_instantiate);
2252}
2253
2254static const struct file_operations proc_fdinfo_operations = {
2255 .read = generic_read_dir,
2256 .readdir = proc_readfdinfo,
6038f373 2257 .llseek = default_llseek,
27932742
MS		 2258};
2259
2260/*
2261 * proc directories can do almost nothing..
2262 */
2263static const struct inode_operations proc_fdinfo_inode_operations = {
2264 .lookup = proc_lookupfdinfo,
2265 .setattr = proc_setattr,
2266};
2267
2268
444ceed8 2269static struct dentry *proc_pident_instantiate(struct inode *dir,
c5141e6d 2270 struct dentry *dentry, struct task_struct *task, const void *ptr)
444ceed8 2271{
c5141e6d 2272 const struct pid_entry *p = ptr;
444ceed8
EB		 2273 struct inode *inode;
2274 struct proc_inode *ei;
bd6daba9 2275 struct dentry *error = ERR_PTR(-ENOENT);
444ceed8 2276
61a28784 2277 inode = proc_pid_make_inode(dir->i_sb, task);
444ceed8
EB		 2278 if (!inode)
2279 goto out;
2280
2281 ei = PROC_I(inode);
2282 inode->i_mode = p->mode;
2283 if (S_ISDIR(inode->i_mode))
2284 inode->i_nlink = 2; /* Use getattr to fix if necessary */
2285 if (p->iop)
2286 inode->i_op = p->iop;
2287 if (p->fop)
2288 inode->i_fop = p->fop;
2289 ei->op = p->op;
fb045adb 2290 d_set_d_op(dentry, &pid_dentry_operations);
444ceed8
EB		 2291 d_add(dentry, inode);
2292 /* Close the race of the process dying before we return the dentry */
2293 if (pid_revalidate(dentry, NULL))
2294 error = NULL;
2295out:
2296 return error;
2297}
2298
1da177e4
LT		 2299static struct dentry *proc_pident_lookup(struct inode *dir,
2300 struct dentry *dentry,
c5141e6d 2301 const struct pid_entry *ents,
7bcd6b0e 2302 unsigned int nents)
1da177e4 2303{
cd6a3ce9 2304 struct dentry *error;
99f89551 2305 struct task_struct *task = get_proc_task(dir);
c5141e6d 2306 const struct pid_entry *p, *last;
1da177e4 2307
cd6a3ce9 2308 error = ERR_PTR(-ENOENT);
1da177e4 2309
99f89551
EB		 2310 if (!task)
2311 goto out_no_task;
1da177e4 2312
20cdc894
EB		 2313 /*
2314 * Yes, it does not scale. And it should not. Don't add
2315 * new entries into /proc/<tgid>/ without very good reasons.
2316 */
7bcd6b0e
EB		 2317 last = &ents[nents - 1];
2318 for (p = ents; p <= last; p++) {
1da177e4
LT		 2319 if (p->len != dentry->d_name.len)
2320 continue;
2321 if (!memcmp(dentry->d_name.name, p->name, p->len))
2322 break;
2323 }
7bcd6b0e 2324 if (p > last)
1da177e4
LT		 2325 goto out;
2326
444ceed8 2327 error = proc_pident_instantiate(dir, dentry, task, p);
1da177e4 2328out:
99f89551
EB		 2329 put_task_struct(task);
2330out_no_task:
cd6a3ce9 2331 return error;
1da177e4
LT		 2332}
2333
c5141e6d
ED		 2334static int proc_pident_fill_cache(struct file *filp, void *dirent,
2335 filldir_t filldir, struct task_struct *task, const struct pid_entry *p)
61a28784
EB		 2336{
2337 return proc_fill_cache(filp, dirent, filldir, p->name, p->len,
2338 proc_pident_instantiate, task, p);
2339}
2340
28a6d671
EB		 2341static int proc_pident_readdir(struct file *filp,
2342 void *dirent, filldir_t filldir,
c5141e6d 2343 const struct pid_entry *ents, unsigned int nents)
28a6d671
EB		 2344{
2345 int i;
2fddfeef 2346 struct dentry *dentry = filp->f_path.dentry;
28a6d671
EB		 2347 struct inode *inode = dentry->d_inode;
2348 struct task_struct *task = get_proc_task(inode);
c5141e6d 2349 const struct pid_entry *p, *last;
28a6d671
EB		 2350 ino_t ino;
2351 int ret;
2352
2353 ret = -ENOENT;
2354 if (!task)
61a28784 2355 goto out_no_task;
28a6d671
EB		 2356
2357 ret = 0;
28a6d671
EB		 2358 i = filp->f_pos;
2359 switch (i) {
2360 case 0:
2361 ino = inode->i_ino;
2362 if (filldir(dirent, ".", 1, i, ino, DT_DIR) < 0)
2363 goto out;
2364 i++;
2365 filp->f_pos++;
2366 /* fall through */
2367 case 1:
2368 ino = parent_ino(dentry);
2369 if (filldir(dirent, "..", 2, i, ino, DT_DIR) < 0)
2370 goto out;
2371 i++;
2372 filp->f_pos++;
2373 /* fall through */
2374 default:
2375 i -= 2;
2376 if (i >= nents) {
2377 ret = 1;
2378 goto out;
2379 }
2380 p = ents + i;
7bcd6b0e
EB		 2381 last = &ents[nents - 1];
2382 while (p <= last) {
61a28784 2383 if (proc_pident_fill_cache(filp, dirent, filldir, task, p) < 0)
28a6d671
EB		 2384 goto out;
2385 filp->f_pos++;
2386 p++;
2387 }
2388 }
2389
2390 ret = 1;
2391out:
61a28784
EB		 2392 put_task_struct(task);
2393out_no_task:
28a6d671 2394 return ret;
1da177e4
LT		 2395}
2396
28a6d671
EB		 2397#ifdef CONFIG_SECURITY
2398static ssize_t proc_pid_attr_read(struct file * file, char __user * buf,
2399 size_t count, loff_t *ppos)
2400{
2fddfeef 2401 struct inode * inode = file->f_path.dentry->d_inode;
04ff9708 2402 char *p = NULL;
28a6d671
EB		 2403 ssize_t length;
2404 struct task_struct *task = get_proc_task(inode);
2405
28a6d671 2406 if (!task)
04ff9708 2407 return -ESRCH;
28a6d671
EB		 2408
2409 length = security_getprocattr(task,
2fddfeef 2410 (char*)file->f_path.dentry->d_name.name,
04ff9708 2411 &p);
28a6d671 2412 put_task_struct(task);
04ff9708
AV		 2413 if (length > 0)
2414 length = simple_read_from_buffer(buf, count, ppos, p, length);
2415 kfree(p);
28a6d671 2416 return length;
1da177e4
LT		 2417}
2418
28a6d671
EB		 2419static ssize_t proc_pid_attr_write(struct file * file, const char __user * buf,
2420 size_t count, loff_t *ppos)
2421{
2fddfeef 2422 struct inode * inode = file->f_path.dentry->d_inode;
28a6d671
EB		 2423 char *page;
2424 ssize_t length;
2425 struct task_struct *task = get_proc_task(inode);
2426
2427 length = -ESRCH;
2428 if (!task)
2429 goto out_no_task;
2430 if (count > PAGE_SIZE)
2431 count = PAGE_SIZE;
2432
2433 /* No partial writes. */
2434 length = -EINVAL;
2435 if (*ppos != 0)
2436 goto out;
2437
2438 length = -ENOMEM;
e12ba74d 2439 page = (char*)__get_free_page(GFP_TEMPORARY);
28a6d671
EB		 2440 if (!page)
2441 goto out;
2442
2443 length = -EFAULT;
2444 if (copy_from_user(page, buf, count))
2445 goto out_free;
2446
107db7c7 2447 /* Guard against adverse ptrace interaction */
9b1bf12d 2448 length = mutex_lock_interruptible(&task->signal->cred_guard_mutex);
107db7c7
DH		 2449 if (length < 0)
2450 goto out_free;
2451
28a6d671 2452 length = security_setprocattr(task,
2fddfeef 2453 (char*)file->f_path.dentry->d_name.name,
28a6d671 2454 (void*)page, count);
9b1bf12d 2455 mutex_unlock(&task->signal->cred_guard_mutex);
28a6d671
EB		 2456out_free:
2457 free_page((unsigned long) page);
2458out:
2459 put_task_struct(task);
2460out_no_task:
2461 return length;
2462}
2463
00977a59 2464static const struct file_operations proc_pid_attr_operations = {
28a6d671
EB		 2465 .read = proc_pid_attr_read,
2466 .write = proc_pid_attr_write,
87df8424 2467 .llseek = generic_file_llseek,
28a6d671
EB		 2468};
2469
c5141e6d 2470static const struct pid_entry attr_dir_stuff[] = {
631f9c18
AD		 2471 REG("current", S_IRUGO|S_IWUGO, proc_pid_attr_operations),
2472 REG("prev", S_IRUGO, proc_pid_attr_operations),
2473 REG("exec", S_IRUGO|S_IWUGO, proc_pid_attr_operations),
2474 REG("fscreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations),
2475 REG("keycreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations),
2476 REG("sockcreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations),
28a6d671
EB		 2477};
2478
72d9dcfc 2479static int proc_attr_dir_readdir(struct file * filp,
28a6d671
EB		 2480 void * dirent, filldir_t filldir)
2481{
2482 return proc_pident_readdir(filp,dirent,filldir,
72d9dcfc 2483 attr_dir_stuff,ARRAY_SIZE(attr_dir_stuff));
28a6d671
EB		 2484}
2485
00977a59 2486static const struct file_operations proc_attr_dir_operations = {
1da177e4 2487 .read = generic_read_dir,
72d9dcfc 2488 .readdir = proc_attr_dir_readdir,
6038f373 2489 .llseek = default_llseek,
1da177e4
LT		 2490};
2491
72d9dcfc 2492static struct dentry *proc_attr_dir_lookup(struct inode *dir,
28a6d671
EB		 2493 struct dentry *dentry, struct nameidata *nd)
2494{
7bcd6b0e
EB		 2495 return proc_pident_lookup(dir, dentry,
2496 attr_dir_stuff, ARRAY_SIZE(attr_dir_stuff));
28a6d671
EB		 2497}
2498
c5ef1c42 2499static const struct inode_operations proc_attr_dir_inode_operations = {
72d9dcfc 2500 .lookup = proc_attr_dir_lookup,
99f89551 2501 .getattr = pid_getattr,
6d76fa58 2502 .setattr = proc_setattr,
1da177e4
LT		 2503};
2504
28a6d671
EB		 2505#endif
2506
698ba7b5 2507#ifdef CONFIG_ELF_CORE
3cb4a0bb
KH		 2508static ssize_t proc_coredump_filter_read(struct file *file, char __user *buf,
2509 size_t count, loff_t *ppos)
2510{
2511 struct task_struct *task = get_proc_task(file->f_dentry->d_inode);
2512 struct mm_struct *mm;
2513 char buffer[PROC_NUMBUF];
2514 size_t len;
2515 int ret;
2516
2517 if (!task)
2518 return -ESRCH;
2519
2520 ret = 0;
2521 mm = get_task_mm(task);
2522 if (mm) {
2523 len = snprintf(buffer, sizeof(buffer), "%08lx\n",
2524 ((mm->flags & MMF_DUMP_FILTER_MASK) >>
2525 MMF_DUMP_FILTER_SHIFT));
2526 mmput(mm);
2527 ret = simple_read_from_buffer(buf, count, ppos, buffer, len);
2528 }
2529
2530 put_task_struct(task);
2531
2532 return ret;
2533}
2534
2535static ssize_t proc_coredump_filter_write(struct file *file,
2536 const char __user *buf,
2537 size_t count,
2538 loff_t *ppos)
2539{
2540 struct task_struct *task;
2541 struct mm_struct *mm;
2542 char buffer[PROC_NUMBUF], *end;
2543 unsigned int val;
2544 int ret;
2545 int i;
2546 unsigned long mask;
2547
2548 ret = -EFAULT;
2549 memset(buffer, 0, sizeof(buffer));
2550 if (count > sizeof(buffer) - 1)
2551 count = sizeof(buffer) - 1;
2552 if (copy_from_user(buffer, buf, count))
2553 goto out_no_task;
2554
2555 ret = -EINVAL;
2556 val = (unsigned int)simple_strtoul(buffer, &end, 0);
2557 if (*end == '\n')
2558 end++;
2559 if (end - buffer == 0)
2560 goto out_no_task;
2561
2562 ret = -ESRCH;
2563 task = get_proc_task(file->f_dentry->d_inode);
2564 if (!task)
2565 goto out_no_task;
2566
2567 ret = end - buffer;
2568 mm = get_task_mm(task);
2569 if (!mm)
2570 goto out_no_mm;
2571
2572 for (i = 0, mask = 1; i < MMF_DUMP_FILTER_BITS; i++, mask <<= 1) {
2573 if (val & mask)
2574 set_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags);
2575 else
2576 clear_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags);
2577 }
2578
2579 mmput(mm);
2580 out_no_mm:
2581 put_task_struct(task);
2582 out_no_task:
2583 return ret;
2584}
2585
2586static const struct file_operations proc_coredump_filter_operations = {
2587 .read = proc_coredump_filter_read,
2588 .write = proc_coredump_filter_write,
87df8424 2589 .llseek = generic_file_llseek,
3cb4a0bb
KH		 2590};
2591#endif
2592
28a6d671
EB		 2593/*
2594 * /proc/self:
2595 */
2596static int proc_self_readlink(struct dentry *dentry, char __user *buffer,
2597 int buflen)
2598{
488e5bc4 2599 struct pid_namespace *ns = dentry->d_sb->s_fs_info;
b55fcb22 2600 pid_t tgid = task_tgid_nr_ns(current, ns);
28a6d671 2601 char tmp[PROC_NUMBUF];
b55fcb22 2602 if (!tgid)
488e5bc4 2603 return -ENOENT;
b55fcb22 2604 sprintf(tmp, "%d", tgid);
28a6d671
EB		 2605 return vfs_readlink(dentry,buffer,buflen,tmp);
2606}
2607
2608static void *proc_self_follow_link(struct dentry *dentry, struct nameidata *nd)
2609{
488e5bc4 2610 struct pid_namespace *ns = dentry->d_sb->s_fs_info;
b55fcb22 2611 pid_t tgid = task_tgid_nr_ns(current, ns);
7fee4868
AV		 2612 char *name = ERR_PTR(-ENOENT);
2613 if (tgid) {
2614 name = __getname();
2615 if (!name)
2616 name = ERR_PTR(-ENOMEM);
2617 else
2618 sprintf(name, "%d", tgid);
2619 }
2620 nd_set_link(nd, name);
2621 return NULL;
2622}
2623
2624static void proc_self_put_link(struct dentry *dentry, struct nameidata *nd,
2625 void *cookie)
2626{
2627 char *s = nd_get_link(nd);
2628 if (!IS_ERR(s))
2629 __putname(s);
28a6d671
EB		 2630}
2631
c5ef1c42 2632static const struct inode_operations proc_self_inode_operations = {
28a6d671
EB		 2633 .readlink = proc_self_readlink,
2634 .follow_link = proc_self_follow_link,
7fee4868 2635 .put_link = proc_self_put_link,
28a6d671
EB		 2636};
2637
801199ce
EB		 2638/*
2639 * proc base
2640 *
2641 * These are the directory entries in the root directory of /proc
2642 * that properly belong to the /proc filesystem, as they describe
2643 * describe something that is process related.
2644 */
c5141e6d 2645static const struct pid_entry proc_base_stuff[] = {
61a28784 2646 NOD("self", S_IFLNK|S_IRWXUGO,
801199ce 2647 &proc_self_inode_operations, NULL, {}),
801199ce
EB		 2648};
2649
444ceed8 2650static struct dentry *proc_base_instantiate(struct inode *dir,
c5141e6d 2651 struct dentry *dentry, struct task_struct *task, const void *ptr)
801199ce 2652{
c5141e6d 2653 const struct pid_entry *p = ptr;
801199ce 2654 struct inode *inode;
801199ce 2655 struct proc_inode *ei;
73d36460 2656 struct dentry *error;
801199ce
EB		 2657
2658 /* Allocate the inode */
2659 error = ERR_PTR(-ENOMEM);
2660 inode = new_inode(dir->i_sb);
2661 if (!inode)
2662 goto out;
2663
2664 /* Initialize the inode */
2665 ei = PROC_I(inode);
85fe4025 2666 inode->i_ino = get_next_ino();
801199ce 2667 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
801199ce
EB		 2668
2669 /*
2670 * grab the reference to the task.
2671 */
1a657f78 2672 ei->pid = get_task_pid(task, PIDTYPE_PID);
801199ce
EB		 2673 if (!ei->pid)
2674 goto out_iput;
2675
801199ce
EB		 2676 inode->i_mode = p->mode;
2677 if (S_ISDIR(inode->i_mode))
2678 inode->i_nlink = 2;
2679 if (S_ISLNK(inode->i_mode))
2680 inode->i_size = 64;
2681 if (p->iop)
2682 inode->i_op = p->iop;
2683 if (p->fop)
2684 inode->i_fop = p->fop;
2685 ei->op = p->op;
801199ce
EB		 2686 d_add(dentry, inode);
2687 error = NULL;
2688out:
801199ce
EB		 2689 return error;
2690out_iput:
2691 iput(inode);
2692 goto out;
2693}
2694
444ceed8
EB		 2695static struct dentry *proc_base_lookup(struct inode *dir, struct dentry *dentry)
2696{
2697 struct dentry *error;
2698 struct task_struct *task = get_proc_task(dir);
c5141e6d 2699 const struct pid_entry *p, *last;
444ceed8
EB		 2700
2701 error = ERR_PTR(-ENOENT);
2702
2703 if (!task)
2704 goto out_no_task;
2705
2706 /* Lookup the directory entry */
7bcd6b0e
EB		 2707 last = &proc_base_stuff[ARRAY_SIZE(proc_base_stuff) - 1];
2708 for (p = proc_base_stuff; p <= last; p++) {
444ceed8
EB		 2709 if (p->len != dentry->d_name.len)
2710 continue;
2711 if (!memcmp(dentry->d_name.name, p->name, p->len))
2712 break;
2713 }
7bcd6b0e 2714 if (p > last)
444ceed8
EB		 2715 goto out;
2716
2717 error = proc_base_instantiate(dir, dentry, task, p);
2718
2719out:
2720 put_task_struct(task);
2721out_no_task:
2722 return error;
2723}
2724
c5141e6d
ED		 2725static int proc_base_fill_cache(struct file *filp, void *dirent,
2726 filldir_t filldir, struct task_struct *task, const struct pid_entry *p)
61a28784
EB		 2727{
2728 return proc_fill_cache(filp, dirent, filldir, p->name, p->len,
2729 proc_base_instantiate, task, p);
2730}
2731
aba76fdb 2732#ifdef CONFIG_TASK_IO_ACCOUNTING
297c5d92
AR		 2733static int do_io_accounting(struct task_struct *task, char *buffer, int whole)
2734{
940389b8 2735 struct task_io_accounting acct = task->ioac;
5995477a
AR		 2736 unsigned long flags;
2737
2738 if (whole && lock_task_sighand(task, &flags)) {
2739 struct task_struct *t = task;
2740
2741 task_io_accounting_add(&acct, &task->signal->ioac);
2742 while_each_thread(task, t)
2743 task_io_accounting_add(&acct, &t->ioac);
2744
2745 unlock_task_sighand(task, &flags);
297c5d92 2746 }
aba76fdb
AM		 2747 return sprintf(buffer,
2748 "rchar: %llu\n"
2749 "wchar: %llu\n"
2750 "syscr: %llu\n"
2751 "syscw: %llu\n"
2752 "read_bytes: %llu\n"
2753 "write_bytes: %llu\n"
2754 "cancelled_write_bytes: %llu\n",
7c44319d
AB		 2755 (unsigned long long)acct.rchar,
2756 (unsigned long long)acct.wchar,
2757 (unsigned long long)acct.syscr,
2758 (unsigned long long)acct.syscw,
2759 (unsigned long long)acct.read_bytes,
2760 (unsigned long long)acct.write_bytes,
2761 (unsigned long long)acct.cancelled_write_bytes);
297c5d92
AR		 2762}
2763
2764static int proc_tid_io_accounting(struct task_struct *task, char *buffer)
2765{
2766 return do_io_accounting(task, buffer, 0);
aba76fdb 2767}
297c5d92
AR		 2768
2769static int proc_tgid_io_accounting(struct task_struct *task, char *buffer)
2770{
2771 return do_io_accounting(task, buffer, 1);
2772}
2773#endif /* CONFIG_TASK_IO_ACCOUNTING */
aba76fdb 2774
47830723
KC		 2775static int proc_pid_personality(struct seq_file *m, struct pid_namespace *ns,
2776 struct pid *pid, struct task_struct *task)
2777{
2778 seq_printf(m, "%08x\n", task->personality);
2779 return 0;
2780}
2781
28a6d671
EB		 2782/*
2783 * Thread groups
2784 */
00977a59 2785static const struct file_operations proc_task_operations;
c5ef1c42 2786static const struct inode_operations proc_task_inode_operations;
20cdc894 2787
c5141e6d 2788static const struct pid_entry tgid_base_stuff[] = {
631f9c18
AD		 2789 DIR("task", S_IRUGO|S_IXUGO, proc_task_inode_operations, proc_task_operations),
2790 DIR("fd", S_IRUSR|S_IXUSR, proc_fd_inode_operations, proc_fd_operations),
2791 DIR("fdinfo", S_IRUSR|S_IXUSR, proc_fdinfo_inode_operations, proc_fdinfo_operations),
b2211a36 2792#ifdef CONFIG_NET
631f9c18 2793 DIR("net", S_IRUGO|S_IXUGO, proc_net_inode_operations, proc_net_operations),
b2211a36 2794#endif
631f9c18
AD		 2795 REG("environ", S_IRUSR, proc_environ_operations),
2796 INF("auxv", S_IRUSR, proc_pid_auxv),
2797 ONE("status", S_IRUGO, proc_pid_status),
2798 ONE("personality", S_IRUSR, proc_pid_personality),
3036e7b4 2799 INF("limits", S_IRUGO, proc_pid_limits),
43ae34cb 2800#ifdef CONFIG_SCHED_DEBUG
631f9c18 2801 REG("sched", S_IRUGO|S_IWUSR, proc_pid_sched_operations),
5091faa4
MG		 2802#endif
2803#ifdef CONFIG_SCHED_AUTOGROUP
2804 REG("autogroup", S_IRUGO|S_IWUSR, proc_pid_sched_autogroup_operations),
ebcb6734 2805#endif
4614a696 2806 REG("comm", S_IRUGO|S_IWUSR, proc_pid_set_comm_operations),
ebcb6734 2807#ifdef CONFIG_HAVE_ARCH_TRACEHOOK
631f9c18 2808 INF("syscall", S_IRUSR, proc_pid_syscall),
43ae34cb 2809#endif
631f9c18
AD		 2810 INF("cmdline", S_IRUGO, proc_pid_cmdline),
2811 ONE("stat", S_IRUGO, proc_tgid_stat),
2812 ONE("statm", S_IRUGO, proc_pid_statm),
2813 REG("maps", S_IRUGO, proc_maps_operations),
28a6d671 2814#ifdef CONFIG_NUMA
631f9c18 2815 REG("numa_maps", S_IRUGO, proc_numa_maps_operations),
28a6d671 2816#endif
631f9c18
AD		 2817 REG("mem", S_IRUSR|S_IWUSR, proc_mem_operations),
2818 LNK("cwd", proc_cwd_link),
2819 LNK("root", proc_root_link),
2820 LNK("exe", proc_exe_link),
2821 REG("mounts", S_IRUGO, proc_mounts_operations),
2822 REG("mountinfo", S_IRUGO, proc_mountinfo_operations),
2823 REG("mountstats", S_IRUSR, proc_mountstats_operations),
1e883281 2824#ifdef CONFIG_PROC_PAGE_MONITOR
631f9c18
AD		 2825 REG("clear_refs", S_IWUSR, proc_clear_refs_operations),
2826 REG("smaps", S_IRUGO, proc_smaps_operations),
ca6b0bf0 2827 REG("pagemap", S_IRUGO, proc_pagemap_operations),
28a6d671
EB		 2828#endif
2829#ifdef CONFIG_SECURITY
631f9c18 2830 DIR("attr", S_IRUGO|S_IXUGO, proc_attr_dir_inode_operations, proc_attr_dir_operations),
28a6d671
EB		 2831#endif
2832#ifdef CONFIG_KALLSYMS
631f9c18 2833 INF("wchan", S_IRUGO, proc_pid_wchan),
28a6d671 2834#endif
2ec220e2
KC		 2835#ifdef CONFIG_STACKTRACE
2836 ONE("stack", S_IRUSR, proc_pid_stack),
28a6d671
EB		 2837#endif
2838#ifdef CONFIG_SCHEDSTATS
631f9c18 2839 INF("schedstat", S_IRUGO, proc_pid_schedstat),
28a6d671 2840#endif
9745512c 2841#ifdef CONFIG_LATENCYTOP
631f9c18 2842 REG("latency", S_IRUGO, proc_lstats_operations),
9745512c 2843#endif
8793d854 2844#ifdef CONFIG_PROC_PID_CPUSET
631f9c18 2845 REG("cpuset", S_IRUGO, proc_cpuset_operations),
a424316c
PM		 2846#endif
2847#ifdef CONFIG_CGROUPS
631f9c18 2848 REG("cgroup", S_IRUGO, proc_cgroup_operations),
28a6d671 2849#endif
631f9c18
AD		 2850 INF("oom_score", S_IRUGO, proc_oom_score),
2851 REG("oom_adj", S_IRUGO|S_IWUSR, proc_oom_adjust_operations),
a63d83f4 2852 REG("oom_score_adj", S_IRUGO|S_IWUSR, proc_oom_score_adj_operations),
28a6d671 2853#ifdef CONFIG_AUDITSYSCALL
631f9c18
AD		 2854 REG("loginuid", S_IWUSR|S_IRUGO, proc_loginuid_operations),
2855 REG("sessionid", S_IRUGO, proc_sessionid_operations),
28a6d671 2856#endif
f4f154fd 2857#ifdef CONFIG_FAULT_INJECTION
631f9c18 2858 REG("make-it-fail", S_IRUGO|S_IWUSR, proc_fault_inject_operations),
f4f154fd 2859#endif
698ba7b5 2860#ifdef CONFIG_ELF_CORE
631f9c18 2861 REG("coredump_filter", S_IRUGO|S_IWUSR, proc_coredump_filter_operations),
3cb4a0bb 2862#endif
aba76fdb 2863#ifdef CONFIG_TASK_IO_ACCOUNTING
631f9c18 2864 INF("io", S_IRUGO, proc_tgid_io_accounting),
aba76fdb 2865#endif
28a6d671 2866};
1da177e4 2867
28a6d671 2868static int proc_tgid_base_readdir(struct file * filp,
1da177e4
LT		 2869 void * dirent, filldir_t filldir)
2870{
2871 return proc_pident_readdir(filp,dirent,filldir,
28a6d671 2872 tgid_base_stuff,ARRAY_SIZE(tgid_base_stuff));
1da177e4
LT		 2873}
2874
00977a59 2875static const struct file_operations proc_tgid_base_operations = {
1da177e4 2876 .read = generic_read_dir,
28a6d671 2877 .readdir = proc_tgid_base_readdir,
6038f373 2878 .llseek = default_llseek,
1da177e4
LT		 2879};
2880
28a6d671 2881static struct dentry *proc_tgid_base_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd){
7bcd6b0e
EB		 2882 return proc_pident_lookup(dir, dentry,
2883 tgid_base_stuff, ARRAY_SIZE(tgid_base_stuff));
1da177e4
LT		 2884}
2885
c5ef1c42 2886static const struct inode_operations proc_tgid_base_inode_operations = {
28a6d671 2887 .lookup = proc_tgid_base_lookup,
99f89551 2888 .getattr = pid_getattr,
6d76fa58 2889 .setattr = proc_setattr,
1da177e4 2890};
1da177e4 2891
60347f67 2892static void proc_flush_task_mnt(struct vfsmount *mnt, pid_t pid, pid_t tgid)
1da177e4 2893{
48e6484d 2894 struct dentry *dentry, *leader, *dir;
8578cea7 2895 char buf[PROC_NUMBUF];
48e6484d
EB		 2896 struct qstr name;
2897
2898 name.name = buf;
60347f67
PE		 2899 name.len = snprintf(buf, sizeof(buf), "%d", pid);
2900 dentry = d_hash_and_lookup(mnt->mnt_root, &name);
48e6484d 2901 if (dentry) {
29f12ca3 2902 shrink_dcache_parent(dentry);
48e6484d
EB		 2903 d_drop(dentry);
2904 dput(dentry);
2905 }
1da177e4 2906
48e6484d 2907 name.name = buf;
60347f67
PE		 2908 name.len = snprintf(buf, sizeof(buf), "%d", tgid);
2909 leader = d_hash_and_lookup(mnt->mnt_root, &name);
48e6484d
EB		 2910 if (!leader)
2911 goto out;
1da177e4 2912
48e6484d
EB		 2913 name.name = "task";
2914 name.len = strlen(name.name);
2915 dir = d_hash_and_lookup(leader, &name);
2916 if (!dir)
2917 goto out_put_leader;
2918
2919 name.name = buf;
60347f67 2920 name.len = snprintf(buf, sizeof(buf), "%d", pid);
48e6484d
EB		 2921 dentry = d_hash_and_lookup(dir, &name);
2922 if (dentry) {
2923 shrink_dcache_parent(dentry);
2924 d_drop(dentry);
2925 dput(dentry);
1da177e4 2926 }
48e6484d
EB		 2927
2928 dput(dir);
2929out_put_leader:
2930 dput(leader);
2931out:
2932 return;
1da177e4
LT		 2933}
2934
0895e91d
RD		 2935/**
2936 * proc_flush_task - Remove dcache entries for @task from the /proc dcache.
2937 * @task: task that should be flushed.
2938 *
2939 * When flushing dentries from proc, one needs to flush them from global
60347f67 2940 * proc (proc_mnt) and from all the namespaces' procs this task was seen
0895e91d
RD		 2941 * in. This call is supposed to do all of this job.
2942 *
2943 * Looks in the dcache for
2944 * /proc/@pid
2945 * /proc/@tgid/task/@pid
2946 * if either directory is present flushes it and all of it'ts children
2947 * from the dcache.
2948 *
2949 * It is safe and reasonable to cache /proc entries for a task until
2950 * that task exits. After that they just clog up the dcache with
2951 * useless entries, possibly causing useful dcache entries to be
2952 * flushed instead. This routine is proved to flush those useless
2953 * dcache entries at process exit time.
2954 *
2955 * NOTE: This routine is just an optimization so it does not guarantee
2956 * that no dcache entries will exist at process exit time it
2957 * just makes it very unlikely that any will persist.
60347f67
PE		 2958 */
2959
2960void proc_flush_task(struct task_struct *task)
2961{
9fcc2d15 2962 int i;
9b4d1cbe 2963 struct pid *pid, *tgid;
130f77ec
PE		 2964 struct upid *upid;
2965
130f77ec 2966 pid = task_pid(task);
9b4d1cbe 2967 tgid = task_tgid(task);
130f77ec 2968
9fcc2d15 2969 for (i = 0; i <= pid->level; i++) {
130f77ec
PE		 2970 upid = &pid->numbers[i];
2971 proc_flush_task_mnt(upid->ns->proc_mnt, upid->nr,
9b4d1cbe 2972 tgid->numbers[i].nr);
130f77ec 2973 }
6f4e6433
PE		 2974
2975 upid = &pid->numbers[pid->level];
2976 if (upid->nr == 1)
2977 pid_ns_release_proc(upid->ns);
60347f67
PE		 2978}
2979
9711ef99
AB		 2980static struct dentry *proc_pid_instantiate(struct inode *dir,
2981 struct dentry * dentry,
c5141e6d 2982 struct task_struct *task, const void *ptr)
444ceed8
EB		 2983{
2984 struct dentry *error = ERR_PTR(-ENOENT);
2985 struct inode *inode;
2986
61a28784 2987 inode = proc_pid_make_inode(dir->i_sb, task);
444ceed8
EB		 2988 if (!inode)
2989 goto out;
2990
2991 inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO;
2992 inode->i_op = &proc_tgid_base_inode_operations;
2993 inode->i_fop = &proc_tgid_base_operations;
2994 inode->i_flags|=S_IMMUTABLE;
aed54175
VN		 2995
2996 inode->i_nlink = 2 + pid_entry_count_dirs(tgid_base_stuff,
2997 ARRAY_SIZE(tgid_base_stuff));
444ceed8 2998
fb045adb 2999 d_set_d_op(dentry, &pid_dentry_operations);
444ceed8
EB		 3000
3001 d_add(dentry, inode);
3002 /* Close the race of the process dying before we return the dentry */
3003 if (pid_revalidate(dentry, NULL))
3004 error = NULL;
3005out:
3006 return error;
3007}
3008
1da177e4
LT		 3009struct dentry *proc_pid_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd)
3010{
73d36460 3011 struct dentry *result;
1da177e4 3012 struct task_struct *task;
1da177e4 3013 unsigned tgid;
b488893a 3014 struct pid_namespace *ns;
1da177e4 3015
801199ce
EB		 3016 result = proc_base_lookup(dir, dentry);
3017 if (!IS_ERR(result) || PTR_ERR(result) != -ENOENT)
3018 goto out;
3019
1da177e4
LT		 3020 tgid = name_to_int(dentry);
3021 if (tgid == ~0U)
3022 goto out;
3023
b488893a 3024 ns = dentry->d_sb->s_fs_info;
de758734 3025 rcu_read_lock();
b488893a 3026 task = find_task_by_pid_ns(tgid, ns);
1da177e4
LT		 3027 if (task)
3028 get_task_struct(task);
de758734 3029 rcu_read_unlock();
1da177e4
LT		 3030 if (!task)
3031 goto out;
3032
444ceed8 3033 result = proc_pid_instantiate(dir, dentry, task, NULL);
1da177e4 3034 put_task_struct(task);
1da177e4 3035out:
cd6a3ce9 3036 return result;
1da177e4
LT		 3037}
3038
1da177e4 3039/*
0804ef4b 3040 * Find the first task with tgid >= tgid
0bc58a91 3041 *
1da177e4 3042 */
19fd4bb2
EB		 3043struct tgid_iter {
3044 unsigned int tgid;
0804ef4b 3045 struct task_struct *task;
19fd4bb2
EB		 3046};
3047static struct tgid_iter next_tgid(struct pid_namespace *ns, struct tgid_iter iter)
3048{
0804ef4b 3049 struct pid *pid;
1da177e4 3050
19fd4bb2
EB		 3051 if (iter.task)
3052 put_task_struct(iter.task);
454cc105 3053 rcu_read_lock();
0804ef4b 3054retry:
19fd4bb2
EB		 3055 iter.task = NULL;
3056 pid = find_ge_pid(iter.tgid, ns);
0804ef4b 3057 if (pid) {
19fd4bb2
EB		 3058 iter.tgid = pid_nr_ns(pid, ns);
3059 iter.task = pid_task(pid, PIDTYPE_PID);
0804ef4b
EB		 3060 /* What we to know is if the pid we have find is the
3061 * pid of a thread_group_leader. Testing for task
3062 * being a thread_group_leader is the obvious thing
3063 * todo but there is a window when it fails, due to
3064 * the pid transfer logic in de_thread.
3065 *
3066 * So we perform the straight forward test of seeing
3067 * if the pid we have found is the pid of a thread
3068 * group leader, and don't worry if the task we have
3069 * found doesn't happen to be a thread group leader.
3070 * As we don't care in the case of readdir.
3071 */
19fd4bb2
EB		 3072 if (!iter.task || !has_group_leader_pid(iter.task)) {
3073 iter.tgid += 1;
0804ef4b 3074 goto retry;
19fd4bb2
EB		 3075 }
3076 get_task_struct(iter.task);
0bc58a91 3077 }
454cc105 3078 rcu_read_unlock();
19fd4bb2 3079 return iter;
1da177e4
LT		 3080}
3081
7bcd6b0e 3082#define TGID_OFFSET (FIRST_PROCESS_ENTRY + ARRAY_SIZE(proc_base_stuff))
0804ef4b 3083
61a28784 3084static int proc_pid_fill_cache(struct file *filp, void *dirent, filldir_t filldir,
19fd4bb2 3085 struct tgid_iter iter)
61a28784
EB		 3086{
3087 char name[PROC_NUMBUF];
19fd4bb2 3088 int len = snprintf(name, sizeof(name), "%d", iter.tgid);
61a28784 3089 return proc_fill_cache(filp, dirent, filldir, name, len,
19fd4bb2 3090 proc_pid_instantiate, iter.task, NULL);
61a28784
EB		 3091}
3092
1da177e4
LT		 3093/* for the /proc/ directory itself, after non-process stuff has been done */
3094int proc_pid_readdir(struct file * filp, void * dirent, filldir_t filldir)
3095{
1da177e4 3096 unsigned int nr = filp->f_pos - FIRST_PROCESS_ENTRY;
2fddfeef 3097 struct task_struct *reaper = get_proc_task(filp->f_path.dentry->d_inode);
19fd4bb2 3098 struct tgid_iter iter;
b488893a 3099 struct pid_namespace *ns;
1da177e4 3100
61a28784
EB		 3101 if (!reaper)
3102 goto out_no_task;
3103
7bcd6b0e 3104 for (; nr < ARRAY_SIZE(proc_base_stuff); filp->f_pos++, nr++) {
c5141e6d 3105 const struct pid_entry *p = &proc_base_stuff[nr];
61a28784 3106 if (proc_base_fill_cache(filp, dirent, filldir, reaper, p) < 0)
801199ce 3107 goto out;
1da177e4
LT		 3108 }
3109
b488893a 3110 ns = filp->f_dentry->d_sb->s_fs_info;
19fd4bb2
EB		 3111 iter.task = NULL;
3112 iter.tgid = filp->f_pos - TGID_OFFSET;
3113 for (iter = next_tgid(ns, iter);
3114 iter.task;
3115 iter.tgid += 1, iter = next_tgid(ns, iter)) {
3116 filp->f_pos = iter.tgid + TGID_OFFSET;
3117 if (proc_pid_fill_cache(filp, dirent, filldir, iter) < 0) {
3118 put_task_struct(iter.task);
0804ef4b 3119 goto out;
1da177e4 3120 }
0bc58a91 3121 }
0804ef4b
EB		 3122 filp->f_pos = PID_MAX_LIMIT + TGID_OFFSET;
3123out:
61a28784
EB		 3124 put_task_struct(reaper);
3125out_no_task:
0bc58a91
EB		 3126 return 0;
3127}
1da177e4 3128
28a6d671
EB		 3129/*
3130 * Tasks
3131 */
c5141e6d 3132static const struct pid_entry tid_base_stuff[] = {
631f9c18 3133 DIR("fd", S_IRUSR|S_IXUSR, proc_fd_inode_operations, proc_fd_operations),
3835541d 3134 DIR("fdinfo", S_IRUSR|S_IXUSR, proc_fdinfo_inode_operations, proc_fdinfo_operations),
631f9c18
AD		 3135 REG("environ", S_IRUSR, proc_environ_operations),
3136 INF("auxv", S_IRUSR, proc_pid_auxv),
3137 ONE("status", S_IRUGO, proc_pid_status),
3138 ONE("personality", S_IRUSR, proc_pid_personality),
3036e7b4 3139 INF("limits", S_IRUGO, proc_pid_limits),
43ae34cb 3140#ifdef CONFIG_SCHED_DEBUG
631f9c18 3141 REG("sched", S_IRUGO|S_IWUSR, proc_pid_sched_operations),
ebcb6734 3142#endif
4614a696 3143 REG("comm", S_IRUGO|S_IWUSR, proc_pid_set_comm_operations),
ebcb6734 3144#ifdef CONFIG_HAVE_ARCH_TRACEHOOK
631f9c18 3145 INF("syscall", S_IRUSR, proc_pid_syscall),
43ae34cb 3146#endif
631f9c18
AD		 3147 INF("cmdline", S_IRUGO, proc_pid_cmdline),
3148 ONE("stat", S_IRUGO, proc_tid_stat),
3149 ONE("statm", S_IRUGO, proc_pid_statm),
3150 REG("maps", S_IRUGO, proc_maps_operations),
28a6d671 3151#ifdef CONFIG_NUMA
631f9c18 3152 REG("numa_maps", S_IRUGO, proc_numa_maps_operations),
28a6d671 3153#endif
631f9c18
AD		 3154 REG("mem", S_IRUSR|S_IWUSR, proc_mem_operations),
3155 LNK("cwd", proc_cwd_link),
3156 LNK("root", proc_root_link),
3157 LNK("exe", proc_exe_link),
3158 REG("mounts", S_IRUGO, proc_mounts_operations),
3159 REG("mountinfo", S_IRUGO, proc_mountinfo_operations),
1e883281 3160#ifdef CONFIG_PROC_PAGE_MONITOR
631f9c18
AD		 3161 REG("clear_refs", S_IWUSR, proc_clear_refs_operations),
3162 REG("smaps", S_IRUGO, proc_smaps_operations),
ca6b0bf0 3163 REG("pagemap", S_IRUGO, proc_pagemap_operations),
28a6d671
EB		 3164#endif
3165#ifdef CONFIG_SECURITY
631f9c18 3166 DIR("attr", S_IRUGO|S_IXUGO, proc_attr_dir_inode_operations, proc_attr_dir_operations),
28a6d671
EB		 3167#endif
3168#ifdef CONFIG_KALLSYMS
631f9c18 3169 INF("wchan", S_IRUGO, proc_pid_wchan),
28a6d671 3170#endif
2ec220e2
KC		 3171#ifdef CONFIG_STACKTRACE
3172 ONE("stack", S_IRUSR, proc_pid_stack),
28a6d671
EB		 3173#endif
3174#ifdef CONFIG_SCHEDSTATS
631f9c18 3175 INF("schedstat", S_IRUGO, proc_pid_schedstat),
28a6d671 3176#endif
9745512c 3177#ifdef CONFIG_LATENCYTOP
631f9c18 3178 REG("latency", S_IRUGO, proc_lstats_operations),
9745512c 3179#endif
8793d854 3180#ifdef CONFIG_PROC_PID_CPUSET
631f9c18 3181 REG("cpuset", S_IRUGO, proc_cpuset_operations),
a424316c
PM		 3182#endif
3183#ifdef CONFIG_CGROUPS
631f9c18 3184 REG("cgroup", S_IRUGO, proc_cgroup_operations),
28a6d671 3185#endif
631f9c18
AD		 3186 INF("oom_score", S_IRUGO, proc_oom_score),
3187 REG("oom_adj", S_IRUGO|S_IWUSR, proc_oom_adjust_operations),
a63d83f4 3188 REG("oom_score_adj", S_IRUGO|S_IWUSR, proc_oom_score_adj_operations),
28a6d671 3189#ifdef CONFIG_AUDITSYSCALL
631f9c18 3190 REG("loginuid", S_IWUSR|S_IRUGO, proc_loginuid_operations),
26ec3c64 3191 REG("sessionid", S_IRUGO, proc_sessionid_operations),
28a6d671 3192#endif
f4f154fd 3193#ifdef CONFIG_FAULT_INJECTION
631f9c18 3194 REG("make-it-fail", S_IRUGO|S_IWUSR, proc_fault_inject_operations),
f4f154fd 3195#endif
297c5d92 3196#ifdef CONFIG_TASK_IO_ACCOUNTING
631f9c18 3197 INF("io", S_IRUGO, proc_tid_io_accounting),
297c5d92 3198#endif
28a6d671
EB		 3199};
3200
3201static int proc_tid_base_readdir(struct file * filp,
3202 void * dirent, filldir_t filldir)
3203{
3204 return proc_pident_readdir(filp,dirent,filldir,
3205 tid_base_stuff,ARRAY_SIZE(tid_base_stuff));
3206}
3207
3208static struct dentry *proc_tid_base_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd){
7bcd6b0e
EB		 3209 return proc_pident_lookup(dir, dentry,
3210 tid_base_stuff, ARRAY_SIZE(tid_base_stuff));
28a6d671
EB		 3211}
3212
00977a59 3213static const struct file_operations proc_tid_base_operations = {
28a6d671
EB		 3214 .read = generic_read_dir,
3215 .readdir = proc_tid_base_readdir,
6038f373 3216 .llseek = default_llseek,
28a6d671
EB		 3217};
3218
c5ef1c42 3219static const struct inode_operations proc_tid_base_inode_operations = {
28a6d671
EB		 3220 .lookup = proc_tid_base_lookup,
3221 .getattr = pid_getattr,
3222 .setattr = proc_setattr,
3223};
3224
444ceed8 3225static struct dentry *proc_task_instantiate(struct inode *dir,
c5141e6d 3226 struct dentry *dentry, struct task_struct *task, const void *ptr)
444ceed8
EB		 3227{
3228 struct dentry *error = ERR_PTR(-ENOENT);
3229 struct inode *inode;
61a28784 3230 inode = proc_pid_make_inode(dir->i_sb, task);
444ceed8
EB		 3231
3232 if (!inode)
3233 goto out;
3234 inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO;
3235 inode->i_op = &proc_tid_base_inode_operations;
3236 inode->i_fop = &proc_tid_base_operations;
3237 inode->i_flags|=S_IMMUTABLE;
aed54175
VN		 3238
3239 inode->i_nlink = 2 + pid_entry_count_dirs(tid_base_stuff,
3240 ARRAY_SIZE(tid_base_stuff));
444ceed8 3241
fb045adb 3242 d_set_d_op(dentry, &pid_dentry_operations);
444ceed8
EB		 3243
3244 d_add(dentry, inode);
3245 /* Close the race of the process dying before we return the dentry */
3246 if (pid_revalidate(dentry, NULL))
3247 error = NULL;
3248out:
3249 return error;
3250}
3251
28a6d671
EB		 3252static struct dentry *proc_task_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd)
3253{
3254 struct dentry *result = ERR_PTR(-ENOENT);
3255 struct task_struct *task;
3256 struct task_struct *leader = get_proc_task(dir);
28a6d671 3257 unsigned tid;
b488893a 3258 struct pid_namespace *ns;
28a6d671
EB		 3259
3260 if (!leader)
3261 goto out_no_task;
3262
3263 tid = name_to_int(dentry);
3264 if (tid == ~0U)
3265 goto out;
3266
b488893a 3267 ns = dentry->d_sb->s_fs_info;
28a6d671 3268 rcu_read_lock();
b488893a 3269 task = find_task_by_pid_ns(tid, ns);
28a6d671
EB		 3270 if (task)
3271 get_task_struct(task);
3272 rcu_read_unlock();
3273 if (!task)
3274 goto out;
bac0abd6 3275 if (!same_thread_group(leader, task))
28a6d671
EB		 3276 goto out_drop_task;
3277
444ceed8 3278 result = proc_task_instantiate(dir, dentry, task, NULL);
28a6d671
EB		 3279out_drop_task:
3280 put_task_struct(task);
3281out:
3282 put_task_struct(leader);
3283out_no_task:
3284 return result;
3285}
3286
0bc58a91
EB		 3287/*
3288 * Find the first tid of a thread group to return to user space.
3289 *
3290 * Usually this is just the thread group leader, but if the users
3291 * buffer was too small or there was a seek into the middle of the
3292 * directory we have more work todo.
3293 *
3294 * In the case of a short read we start with find_task_by_pid.
3295 *
3296 * In the case of a seek we start with the leader and walk nr
3297 * threads past it.
3298 */
cc288738 3299static struct task_struct *first_tid(struct task_struct *leader,
b488893a 3300 int tid, int nr, struct pid_namespace *ns)
0bc58a91 3301{
a872ff0c 3302 struct task_struct *pos;
1da177e4 3303
cc288738 3304 rcu_read_lock();
0bc58a91
EB		 3305 /* Attempt to start with the pid of a thread */
3306 if (tid && (nr > 0)) {
b488893a 3307 pos = find_task_by_pid_ns(tid, ns);
a872ff0c
ON		 3308 if (pos && (pos->group_leader == leader))
3309 goto found;
0bc58a91 3310 }
1da177e4 3311
0bc58a91 3312 /* If nr exceeds the number of threads there is nothing todo */
a872ff0c
ON		 3313 pos = NULL;
3314 if (nr && nr >= get_nr_threads(leader))
3315 goto out;
1da177e4 3316
a872ff0c
ON		 3317 /* If we haven't found our starting place yet start
3318 * with the leader and walk nr threads forward.
0bc58a91 3319 */
a872ff0c
ON		 3320 for (pos = leader; nr > 0; --nr) {
3321 pos = next_thread(pos);
3322 if (pos == leader) {
3323 pos = NULL;
3324 goto out;
3325 }
1da177e4 3326 }
a872ff0c
ON		 3327found:
3328 get_task_struct(pos);
3329out:
cc288738 3330 rcu_read_unlock();
0bc58a91
EB		 3331 return pos;
3332}
3333
3334/*
3335 * Find the next thread in the thread list.
3336 * Return NULL if there is an error or no next thread.
3337 *
3338 * The reference to the input task_struct is released.
3339 */
3340static struct task_struct *next_tid(struct task_struct *start)
3341{
c1df7fb8 3342 struct task_struct *pos = NULL;
cc288738 3343 rcu_read_lock();
c1df7fb8 3344 if (pid_alive(start)) {
0bc58a91 3345 pos = next_thread(start);
c1df7fb8
ON		 3346 if (thread_group_leader(pos))
3347 pos = NULL;
3348 else
3349 get_task_struct(pos);
3350 }
cc288738 3351 rcu_read_unlock();
0bc58a91
EB		 3352 put_task_struct(start);
3353 return pos;
1da177e4
LT		 3354}
3355
61a28784
EB		 3356static int proc_task_fill_cache(struct file *filp, void *dirent, filldir_t filldir,
3357 struct task_struct *task, int tid)
3358{
3359 char name[PROC_NUMBUF];
3360 int len = snprintf(name, sizeof(name), "%d", tid);
3361 return proc_fill_cache(filp, dirent, filldir, name, len,
3362 proc_task_instantiate, task, NULL);
3363}
3364
1da177e4
LT		 3365/* for the /proc/TGID/task/ directories */
3366static int proc_task_readdir(struct file * filp, void * dirent, filldir_t filldir)
3367{
2fddfeef 3368 struct dentry *dentry = filp->f_path.dentry;
1da177e4 3369 struct inode *inode = dentry->d_inode;
7d895244 3370 struct task_struct *leader = NULL;
0bc58a91 3371 struct task_struct *task;
1da177e4
LT		 3372 int retval = -ENOENT;
3373 ino_t ino;
0bc58a91 3374 int tid;
b488893a 3375 struct pid_namespace *ns;
1da177e4 3376
7d895244
GC		 3377 task = get_proc_task(inode);
3378 if (!task)
3379 goto out_no_task;
3380 rcu_read_lock();
3381 if (pid_alive(task)) {
3382 leader = task->group_leader;
3383 get_task_struct(leader);
3384 }
3385 rcu_read_unlock();
3386 put_task_struct(task);
99f89551
EB		 3387 if (!leader)
3388 goto out_no_task;
1da177e4
LT		 3389 retval = 0;
3390
ee568b25 3391 switch ((unsigned long)filp->f_pos) {
1da177e4
LT		 3392 case 0:
3393 ino = inode->i_ino;
ee6f779b 3394 if (filldir(dirent, ".", 1, filp->f_pos, ino, DT_DIR) < 0)
1da177e4 3395 goto out;
ee6f779b 3396 filp->f_pos++;
1da177e4
LT		 3397 /* fall through */
3398 case 1:
3399 ino = parent_ino(dentry);
ee6f779b 3400 if (filldir(dirent, "..", 2, filp->f_pos, ino, DT_DIR) < 0)
1da177e4 3401 goto out;
ee6f779b 3402 filp->f_pos++;
1da177e4
LT		 3403 /* fall through */
3404 }
3405
0bc58a91
EB		 3406 /* f_version caches the tgid value that the last readdir call couldn't
3407 * return. lseek aka telldir automagically resets f_version to 0.
3408 */
b488893a 3409 ns = filp->f_dentry->d_sb->s_fs_info;
2b47c361 3410 tid = (int)filp->f_version;
0bc58a91 3411 filp->f_version = 0;
ee6f779b 3412 for (task = first_tid(leader, tid, filp->f_pos - 2, ns);
0bc58a91 3413 task;
ee6f779b 3414 task = next_tid(task), filp->f_pos++) {
b488893a 3415 tid = task_pid_nr_ns(task, ns);
61a28784 3416 if (proc_task_fill_cache(filp, dirent, filldir, task, tid) < 0) {
0bc58a91
EB		 3417 /* returning this tgid failed, save it as the first
3418 * pid for the next readir call */
2b47c361 3419 filp->f_version = (u64)tid;
0bc58a91 3420 put_task_struct(task);
1da177e4 3421 break;
0bc58a91 3422 }
1da177e4
LT		 3423 }
3424out:
99f89551
EB		 3425 put_task_struct(leader);
3426out_no_task:
1da177e4
LT		 3427 return retval;
3428}
6e66b52b
EB		 3429
3430static int proc_task_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
3431{
3432 struct inode *inode = dentry->d_inode;
99f89551 3433 struct task_struct *p = get_proc_task(inode);
6e66b52b
EB		 3434 generic_fillattr(inode, stat);
3435
99f89551 3436 if (p) {
99f89551 3437 stat->nlink += get_nr_threads(p);
99f89551 3438 put_task_struct(p);
6e66b52b
EB		 3439 }
3440
3441 return 0;
3442}
28a6d671 3443
c5ef1c42 3444static const struct inode_operations proc_task_inode_operations = {
28a6d671
EB		 3445 .lookup = proc_task_lookup,
3446 .getattr = proc_task_getattr,
3447 .setattr = proc_setattr,
3448};
3449
00977a59 3450static const struct file_operations proc_task_operations = {
28a6d671
EB		 3451 .read = generic_read_dir,
3452 .readdir = proc_task_readdir,
6038f373 3453 .llseek = default_llseek,
28a6d671 3454};
Mirror https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git