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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>
640708a2 86#include <linux/flex_array.h>
f133ecca
CM		 87#ifdef CONFIG_HARDWALL
88#include <asm/hardwall.h>
89#endif
43d2b113 90#include <trace/events/oom.h>
1da177e4
LT		 91#include "internal.h"
92
0f2fe20f
EB		 93/* NOTE:
94 * Implementing inode permission operations in /proc is almost
95 * certainly an error. Permission checks need to happen during
96 * each system call not at open time. The reason is that most of
97 * what we wish to check for permissions in /proc varies at runtime.
98 *
99 * The classic example of a problem is opening file descriptors
100 * in /proc for a task before it execs a suid executable.
101 */
102
1da177e4 103struct pid_entry {
1da177e4 104 char *name;
c5141e6d 105 int len;
d161a13f 106 umode_t mode;
c5ef1c42 107 const struct inode_operations *iop;
00977a59 108 const struct file_operations *fop;
20cdc894 109 union proc_op op;
1da177e4
LT		 110};
111
61a28784 112#define NOD(NAME, MODE, IOP, FOP, OP) { \
20cdc894 113 .name = (NAME), \
c5141e6d 114 .len = sizeof(NAME) - 1, \
20cdc894
EB		 115 .mode = MODE, \
116 .iop = IOP, \
117 .fop = FOP, \
118 .op = OP, \
119}
120
631f9c18
AD		 121#define DIR(NAME, MODE, iops, fops) \
122 NOD(NAME, (S_IFDIR|(MODE)), &iops, &fops, {} )
123#define LNK(NAME, get_link) \
61a28784 124 NOD(NAME, (S_IFLNK|S_IRWXUGO), \
20cdc894 125 &proc_pid_link_inode_operations, NULL, \
631f9c18
AD		 126 { .proc_get_link = get_link } )
127#define REG(NAME, MODE, fops) \
128 NOD(NAME, (S_IFREG|(MODE)), NULL, &fops, {})
129#define INF(NAME, MODE, read) \
61a28784 130 NOD(NAME, (S_IFREG|(MODE)), \
20cdc894 131 NULL, &proc_info_file_operations, \
631f9c18
AD		 132 { .proc_read = read } )
133#define ONE(NAME, MODE, show) \
be614086
EB		 134 NOD(NAME, (S_IFREG|(MODE)), \
135 NULL, &proc_single_file_operations, \
631f9c18 136 { .proc_show = show } )
1da177e4 137
640708a2
PE		 138static int proc_fd_permission(struct inode *inode, int mask);
139
aed54175
VN		 140/*
141 * Count the number of hardlinks for the pid_entry table, excluding the .
142 * and .. links.
143 */
144static unsigned int pid_entry_count_dirs(const struct pid_entry *entries,
145 unsigned int n)
146{
147 unsigned int i;
148 unsigned int count;
149
150 count = 0;
151 for (i = 0; i < n; ++i) {
152 if (S_ISDIR(entries[i].mode))
153 ++count;
154 }
155
156 return count;
157}
158
f7ad3c6b 159static int get_task_root(struct task_struct *task, struct path *root)
1da177e4 160{
7c2c7d99
HD		 161 int result = -ENOENT;
162
0494f6ec 163 task_lock(task);
f7ad3c6b
MS		 164 if (task->fs) {
165 get_fs_root(task->fs, root);
7c2c7d99
HD		 166 result = 0;
167 }
0494f6ec 168 task_unlock(task);
7c2c7d99 169 return result;
0494f6ec
MS		 170}
171
7773fbc5 172static int proc_cwd_link(struct dentry *dentry, struct path *path)
0494f6ec 173{
7773fbc5 174 struct task_struct *task = get_proc_task(dentry->d_inode);
0494f6ec 175 int result = -ENOENT;
99f89551
EB		 176
177 if (task) {
f7ad3c6b
MS		 178 task_lock(task);
179 if (task->fs) {
180 get_fs_pwd(task->fs, path);
181 result = 0;
182 }
183 task_unlock(task);
99f89551
EB		 184 put_task_struct(task);
185 }
1da177e4
LT		 186 return result;
187}
188
7773fbc5 189static int proc_root_link(struct dentry *dentry, struct path *path)
1da177e4 190{
7773fbc5 191 struct task_struct *task = get_proc_task(dentry->d_inode);
1da177e4 192 int result = -ENOENT;
99f89551
EB		 193
194 if (task) {
f7ad3c6b 195 result = get_task_root(task, path);
99f89551
EB		 196 put_task_struct(task);
197 }
1da177e4
LT		 198 return result;
199}
200
8b0db9db 201static struct mm_struct *__check_mem_permission(struct task_struct *task)
638fa202 202{
8b0db9db
SW		 203 struct mm_struct *mm;
204
205 mm = get_task_mm(task);
206 if (!mm)
207 return ERR_PTR(-EINVAL);
208
638fa202
RM		 209 /*
210 * A task can always look at itself, in case it chooses
211 * to use system calls instead of load instructions.
212 */
213 if (task == current)
8b0db9db 214 return mm;
638fa202
RM		 215
216 /*
217 * If current is actively ptrace'ing, and would also be
218 * permitted to freshly attach with ptrace now, permit it.
219 */
0d094efe
RM		 220 if (task_is_stopped_or_traced(task)) {
221 int match;
222 rcu_read_lock();
06d98473 223 match = (ptrace_parent(task) == current);
0d094efe
RM		 224 rcu_read_unlock();
225 if (match && ptrace_may_access(task, PTRACE_MODE_ATTACH))
8b0db9db 226 return mm;
0d094efe 227 }
638fa202
RM		 228
229 /*
25985edc 230 * No one else is allowed.
638fa202 231 */
8b0db9db
SW		 232 mmput(mm);
233 return ERR_PTR(-EPERM);
638fa202 234}
1da177e4 235
18f661bc 236/*
8b0db9db
SW		 237 * If current may access user memory in @task return a reference to the
238 * corresponding mm, otherwise ERR_PTR.
18f661bc 239 */
8b0db9db 240static struct mm_struct *check_mem_permission(struct task_struct *task)
18f661bc 241{
8b0db9db 242 struct mm_struct *mm;
18f661bc
SW		 243 int err;
244
245 /*
246 * Avoid racing if task exec's as we might get a new mm but validate
247 * against old credentials.
248 */
249 err = mutex_lock_killable(&task->signal->cred_guard_mutex);
250 if (err)
8b0db9db 251 return ERR_PTR(err);
18f661bc 252
8b0db9db 253 mm = __check_mem_permission(task);
18f661bc
SW		 254 mutex_unlock(&task->signal->cred_guard_mutex);
255
8b0db9db 256 return mm;
638fa202 257}
1da177e4 258
831830b5
AV		 259struct mm_struct *mm_for_maps(struct task_struct *task)
260{
704b836c 261 struct mm_struct *mm;
ec6fd8a4 262 int err;
704b836c 263
ec6fd8a4
AV		 264 err = mutex_lock_killable(&task->signal->cred_guard_mutex);
265 if (err)
266 return ERR_PTR(err);
00f89d21 267
704b836c
ON		 268 mm = get_task_mm(task);
269 if (mm && mm != current->mm &&
270 !ptrace_may_access(task, PTRACE_MODE_READ)) {
271 mmput(mm);
ec6fd8a4 272 mm = ERR_PTR(-EACCES);
13f0feaf 273 }
9b1bf12d 274 mutex_unlock(&task->signal->cred_guard_mutex);
704b836c 275
831830b5 276 return mm;
831830b5
AV		 277}
278
1da177e4
LT		 279static int proc_pid_cmdline(struct task_struct *task, char * buffer)
280{
281 int res = 0;
282 unsigned int len;
283 struct mm_struct *mm = get_task_mm(task);
284 if (!mm)
285 goto out;
286 if (!mm->arg_end)
287 goto out_mm; /* Shh! No looking before we're done */
288
289 len = mm->arg_end - mm->arg_start;
290
291 if (len > PAGE_SIZE)
292 len = PAGE_SIZE;
293
294 res = access_process_vm(task, mm->arg_start, buffer, len, 0);
295
296 // If the nul at the end of args has been overwritten, then
297 // assume application is using setproctitle(3).
298 if (res > 0 && buffer[res-1] != '\0' && len < PAGE_SIZE) {
299 len = strnlen(buffer, res);
300 if (len < res) {
301 res = len;
302 } else {
303 len = mm->env_end - mm->env_start;
304 if (len > PAGE_SIZE - res)
305 len = PAGE_SIZE - res;
306 res += access_process_vm(task, mm->env_start, buffer+res, len, 0);
307 res = strnlen(buffer, res);
308 }
309 }
310out_mm:
311 mmput(mm);
312out:
313 return res;
314}
315
316static int proc_pid_auxv(struct task_struct *task, char *buffer)
317{
2fadaef4
AV		 318 struct mm_struct *mm = mm_for_maps(task);
319 int res = PTR_ERR(mm);
320 if (mm && !IS_ERR(mm)) {
1da177e4 321 unsigned int nwords = 0;
dfe6b7d9 322 do {
1da177e4 323 nwords += 2;
dfe6b7d9 324 } while (mm->saved_auxv[nwords - 2] != 0); /* AT_NULL */
1da177e4
LT		 325 res = nwords * sizeof(mm->saved_auxv[0]);
326 if (res > PAGE_SIZE)
327 res = PAGE_SIZE;
328 memcpy(buffer, mm->saved_auxv, res);
329 mmput(mm);
330 }
331 return res;
332}
333
334
335#ifdef CONFIG_KALLSYMS
336/*
337 * Provides a wchan file via kallsyms in a proper one-value-per-file format.
338 * Returns the resolved symbol. If that fails, simply return the address.
339 */
340static int proc_pid_wchan(struct task_struct *task, char *buffer)
341{
ffb45122 342 unsigned long wchan;
9281acea 343 char symname[KSYM_NAME_LEN];
1da177e4
LT		 344
345 wchan = get_wchan(task);
346
9d65cb4a 347 if (lookup_symbol_name(wchan, symname) < 0)
f83ce3e6
JE		 348 if (!ptrace_may_access(task, PTRACE_MODE_READ))
349 return 0;
350 else
351 return sprintf(buffer, "%lu", wchan);
9d65cb4a
AD		 352 else
353 return sprintf(buffer, "%s", symname);
1da177e4
LT		 354}
355#endif /* CONFIG_KALLSYMS */
356
a9712bc1
AV		 357static int lock_trace(struct task_struct *task)
358{
359 int err = mutex_lock_killable(&task->signal->cred_guard_mutex);
360 if (err)
361 return err;
362 if (!ptrace_may_access(task, PTRACE_MODE_ATTACH)) {
363 mutex_unlock(&task->signal->cred_guard_mutex);
364 return -EPERM;
365 }
366 return 0;
367}
368
369static void unlock_trace(struct task_struct *task)
370{
371 mutex_unlock(&task->signal->cred_guard_mutex);
372}
373
2ec220e2
KC		 374#ifdef CONFIG_STACKTRACE
375
376#define MAX_STACK_TRACE_DEPTH 64
377
378static int proc_pid_stack(struct seq_file *m, struct pid_namespace *ns,
379 struct pid *pid, struct task_struct *task)
380{
381 struct stack_trace trace;
382 unsigned long *entries;
a9712bc1 383 int err;
2ec220e2
KC		 384 int i;
385
386 entries = kmalloc(MAX_STACK_TRACE_DEPTH * sizeof(*entries), GFP_KERNEL);
387 if (!entries)
388 return -ENOMEM;
389
390 trace.nr_entries = 0;
391 trace.max_entries = MAX_STACK_TRACE_DEPTH;
392 trace.entries = entries;
393 trace.skip = 0;
2ec220e2 394
a9712bc1
AV		 395 err = lock_trace(task);
396 if (!err) {
397 save_stack_trace_tsk(task, &trace);
398
399 for (i = 0; i < trace.nr_entries; i++) {
b81a618d 400 seq_printf(m, "[<%pK>] %pS\n",
a9712bc1
AV		 401 (void *)entries[i], (void *)entries[i]);
402 }
403 unlock_trace(task);
2ec220e2
KC		 404 }
405 kfree(entries);
406
a9712bc1 407 return err;
2ec220e2
KC		 408}
409#endif
410
1da177e4
LT		 411#ifdef CONFIG_SCHEDSTATS
412/*
413 * Provides /proc/PID/schedstat
414 */
415static int proc_pid_schedstat(struct task_struct *task, char *buffer)
416{
172ba844 417 return sprintf(buffer, "%llu %llu %lu\n",
826e08b0
IM		 418 (unsigned long long)task->se.sum_exec_runtime,
419 (unsigned long long)task->sched_info.run_delay,
2d72376b 420 task->sched_info.pcount);
1da177e4
LT		 421}
422#endif
423
9745512c
AV		 424#ifdef CONFIG_LATENCYTOP
425static int lstats_show_proc(struct seq_file *m, void *v)
426{
427 int i;
13d77c37
HS		 428 struct inode *inode = m->private;
429 struct task_struct *task = get_proc_task(inode);
9745512c 430
13d77c37
HS		 431 if (!task)
432 return -ESRCH;
433 seq_puts(m, "Latency Top version : v0.1\n");
9745512c 434 for (i = 0; i < 32; i++) {
34e49d4f
JP		 435 struct latency_record *lr = &task->latency_record[i];
436 if (lr->backtrace[0]) {
9745512c 437 int q;
34e49d4f
JP		 438 seq_printf(m, "%i %li %li",
439 lr->count, lr->time, lr->max);
9745512c 440 for (q = 0; q < LT_BACKTRACEDEPTH; q++) {
34e49d4f
JP		 441 unsigned long bt = lr->backtrace[q];
442 if (!bt)
9745512c 443 break;
34e49d4f 444 if (bt == ULONG_MAX)
9745512c 445 break;
34e49d4f 446 seq_printf(m, " %ps", (void *)bt);
9745512c 447 }
9d6de12f 448 seq_putc(m, '\n');
9745512c
AV		 449 }
450
451 }
13d77c37 452 put_task_struct(task);
9745512c
AV		 453 return 0;
454}
455
456static int lstats_open(struct inode *inode, struct file *file)
457{
13d77c37 458 return single_open(file, lstats_show_proc, inode);
d6643d12
HS		 459}
460
9745512c
AV		 461static ssize_t lstats_write(struct file *file, const char __user *buf,
462 size_t count, loff_t *offs)
463{
13d77c37 464 struct task_struct *task = get_proc_task(file->f_dentry->d_inode);
9745512c 465
13d77c37
HS		 466 if (!task)
467 return -ESRCH;
9745512c 468 clear_all_latency_tracing(task);
13d77c37 469 put_task_struct(task);
9745512c
AV		 470
471 return count;
472}
473
474static const struct file_operations proc_lstats_operations = {
475 .open = lstats_open,
476 .read = seq_read,
477 .write = lstats_write,
478 .llseek = seq_lseek,
13d77c37 479 .release = single_release,
9745512c
AV		 480};
481
482#endif
483
1da177e4
LT		 484static int proc_oom_score(struct task_struct *task, char *buffer)
485{
b95c35e7 486 unsigned long points = 0;
1da177e4 487
19c5d45a 488 read_lock(&tasklist_lock);
b95c35e7 489 if (pid_alive(task))
a63d83f4
DR		 490 points = oom_badness(task, NULL, NULL,
491 totalram_pages + total_swap_pages);
19c5d45a 492 read_unlock(&tasklist_lock);
1da177e4
LT		 493 return sprintf(buffer, "%lu\n", points);
494}
495
d85f50d5
NH		 496struct limit_names {
497 char *name;
498 char *unit;
499};
500
501static const struct limit_names lnames[RLIM_NLIMITS] = {
cff4edb5 502 [RLIMIT_CPU] = {"Max cpu time", "seconds"},
d85f50d5
NH		 503 [RLIMIT_FSIZE] = {"Max file size", "bytes"},
504 [RLIMIT_DATA] = {"Max data size", "bytes"},
505 [RLIMIT_STACK] = {"Max stack size", "bytes"},
506 [RLIMIT_CORE] = {"Max core file size", "bytes"},
507 [RLIMIT_RSS] = {"Max resident set", "bytes"},
508 [RLIMIT_NPROC] = {"Max processes", "processes"},
509 [RLIMIT_NOFILE] = {"Max open files", "files"},
510 [RLIMIT_MEMLOCK] = {"Max locked memory", "bytes"},
511 [RLIMIT_AS] = {"Max address space", "bytes"},
512 [RLIMIT_LOCKS] = {"Max file locks", "locks"},
513 [RLIMIT_SIGPENDING] = {"Max pending signals", "signals"},
514 [RLIMIT_MSGQUEUE] = {"Max msgqueue size", "bytes"},
515 [RLIMIT_NICE] = {"Max nice priority", NULL},
516 [RLIMIT_RTPRIO] = {"Max realtime priority", NULL},
8808117c 517 [RLIMIT_RTTIME] = {"Max realtime timeout", "us"},
d85f50d5
NH		 518};
519
520/* Display limits for a process */
521static int proc_pid_limits(struct task_struct *task, char *buffer)
522{
523 unsigned int i;
524 int count = 0;
525 unsigned long flags;
526 char *bufptr = buffer;
527
528 struct rlimit rlim[RLIM_NLIMITS];
529
a6bebbc8 530 if (!lock_task_sighand(task, &flags))
d85f50d5 531 return 0;
d85f50d5
NH		 532 memcpy(rlim, task->signal->rlim, sizeof(struct rlimit) * RLIM_NLIMITS);
533 unlock_task_sighand(task, &flags);
d85f50d5
NH		 534
535 /*
536 * print the file header
537 */
538 count += sprintf(&bufptr[count], "%-25s %-20s %-20s %-10s\n",
539 "Limit", "Soft Limit", "Hard Limit", "Units");
540
541 for (i = 0; i < RLIM_NLIMITS; i++) {
542 if (rlim[i].rlim_cur == RLIM_INFINITY)
543 count += sprintf(&bufptr[count], "%-25s %-20s ",
544 lnames[i].name, "unlimited");
545 else
546 count += sprintf(&bufptr[count], "%-25s %-20lu ",
547 lnames[i].name, rlim[i].rlim_cur);
548
549 if (rlim[i].rlim_max == RLIM_INFINITY)
550 count += sprintf(&bufptr[count], "%-20s ", "unlimited");
551 else
552 count += sprintf(&bufptr[count], "%-20lu ",
553 rlim[i].rlim_max);
554
555 if (lnames[i].unit)
556 count += sprintf(&bufptr[count], "%-10s\n",
557 lnames[i].unit);
558 else
559 count += sprintf(&bufptr[count], "\n");
560 }
561
562 return count;
563}
564
ebcb6734
RM		 565#ifdef CONFIG_HAVE_ARCH_TRACEHOOK
566static int proc_pid_syscall(struct task_struct *task, char *buffer)
567{
568 long nr;
569 unsigned long args[6], sp, pc;
a9712bc1
AV		 570 int res = lock_trace(task);
571 if (res)
572 return res;
ebcb6734
RM		 573
574 if (task_current_syscall(task, &nr, args, 6, &sp, &pc))
a9712bc1
AV		 575 res = sprintf(buffer, "running\n");
576 else if (nr < 0)
577 res = sprintf(buffer, "%ld 0x%lx 0x%lx\n", nr, sp, pc);
578 else
579 res = sprintf(buffer,
ebcb6734
RM		 580 "%ld 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx\n",
581 nr,
582 args[0], args[1], args[2], args[3], args[4], args[5],
583 sp, pc);
a9712bc1
AV		 584 unlock_trace(task);
585 return res;
ebcb6734
RM		 586}
587#endif /* CONFIG_HAVE_ARCH_TRACEHOOK */
588
1da177e4
LT		 589/************************************************************************/
590/* Here the fs part begins */
591/************************************************************************/
592
593/* permission checks */
778c1144 594static int proc_fd_access_allowed(struct inode *inode)
1da177e4 595{
778c1144
EB		 596 struct task_struct *task;
597 int allowed = 0;
df26c40e
EB		 598 /* Allow access to a task's file descriptors if it is us or we
599 * may use ptrace attach to the process and find out that
600 * information.
778c1144
EB		 601 */
602 task = get_proc_task(inode);
df26c40e 603 if (task) {
006ebb40 604 allowed = ptrace_may_access(task, PTRACE_MODE_READ);
778c1144 605 put_task_struct(task);
df26c40e 606 }
778c1144 607 return allowed;
1da177e4
LT		 608}
609
6b4e306a 610int proc_setattr(struct dentry *dentry, struct iattr *attr)
6d76fa58
LT		 611{
612 int error;
613 struct inode *inode = dentry->d_inode;
614
615 if (attr->ia_valid & ATTR_MODE)
616 return -EPERM;
617
618 error = inode_change_ok(inode, attr);
1025774c
CH		 619 if (error)
620 return error;
621
622 if ((attr->ia_valid & ATTR_SIZE) &&
623 attr->ia_size != i_size_read(inode)) {
624 error = vmtruncate(inode, attr->ia_size);
625 if (error)
626 return error;
627 }
628
629 setattr_copy(inode, attr);
630 mark_inode_dirty(inode);
631 return 0;
6d76fa58
LT		 632}
633
c5ef1c42 634static const struct inode_operations proc_def_inode_operations = {
6d76fa58
LT		 635 .setattr = proc_setattr,
636};
637
1da177e4
LT		 638#define PROC_BLOCK_SIZE (3*1024) /* 4K page size but our output routines use some slack for overruns */
639
640static ssize_t proc_info_read(struct file * file, char __user * buf,
641 size_t count, loff_t *ppos)
642{
2fddfeef 643 struct inode * inode = file->f_path.dentry->d_inode;
1da177e4
LT		 644 unsigned long page;
645 ssize_t length;
99f89551
EB		 646 struct task_struct *task = get_proc_task(inode);
647
648 length = -ESRCH;
649 if (!task)
650 goto out_no_task;
1da177e4
LT		 651
652 if (count > PROC_BLOCK_SIZE)
653 count = PROC_BLOCK_SIZE;
99f89551
EB		 654
655 length = -ENOMEM;
e12ba74d 656 if (!(page = __get_free_page(GFP_TEMPORARY)))
99f89551 657 goto out;
1da177e4
LT		 658
659 length = PROC_I(inode)->op.proc_read(task, (char*)page);
660
661 if (length >= 0)
662 length = simple_read_from_buffer(buf, count, ppos, (char *)page, length);
663 free_page(page);
99f89551
EB		 664out:
665 put_task_struct(task);
666out_no_task:
1da177e4
LT		 667 return length;
668}
669
00977a59 670static const struct file_operations proc_info_file_operations = {
1da177e4 671 .read = proc_info_read,
87df8424 672 .llseek = generic_file_llseek,
1da177e4
LT		 673};
674
be614086
EB		 675static int proc_single_show(struct seq_file *m, void *v)
676{
677 struct inode *inode = m->private;
678 struct pid_namespace *ns;
679 struct pid *pid;
680 struct task_struct *task;
681 int ret;
682
683 ns = inode->i_sb->s_fs_info;
684 pid = proc_pid(inode);
685 task = get_pid_task(pid, PIDTYPE_PID);
686 if (!task)
687 return -ESRCH;
688
689 ret = PROC_I(inode)->op.proc_show(m, ns, pid, task);
690
691 put_task_struct(task);
692 return ret;
693}
694
695static int proc_single_open(struct inode *inode, struct file *filp)
696{
c6a34058 697 return single_open(filp, proc_single_show, inode);
be614086
EB		 698}
699
700static const struct file_operations proc_single_file_operations = {
701 .open = proc_single_open,
702 .read = seq_read,
703 .llseek = seq_lseek,
704 .release = single_release,
705};
706
1da177e4
LT		 707static int mem_open(struct inode* inode, struct file* file)
708{
709 file->private_data = (void*)((long)current->self_exec_id);
4a3956c7
KH		 710 /* OK to pass negative loff_t, we can catch out-of-range */
711 file->f_mode |= FMODE_UNSIGNED_OFFSET;
1da177e4
LT		 712 return 0;
713}
714
715static ssize_t mem_read(struct file * file, char __user * buf,
716 size_t count, loff_t *ppos)
717{
2fddfeef 718 struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode);
1da177e4
LT		 719 char *page;
720 unsigned long src = *ppos;
721 int ret = -ESRCH;
722 struct mm_struct *mm;
723
99f89551
EB		 724 if (!task)
725 goto out_no_task;
726
1da177e4 727 ret = -ENOMEM;
e12ba74d 728 page = (char *)__get_free_page(GFP_TEMPORARY);
1da177e4
LT		 729 if (!page)
730 goto out;
731
8b0db9db
SW		 732 mm = check_mem_permission(task);
733 ret = PTR_ERR(mm);
734 if (IS_ERR(mm))
1da177e4
LT		 735 goto out_free;
736
737 ret = -EIO;
738
739 if (file->private_data != (void*)((long)current->self_exec_id))
740 goto out_put;
741
742 ret = 0;
743
744 while (count > 0) {
745 int this_len, retval;
746
747 this_len = (count > PAGE_SIZE) ? PAGE_SIZE : count;
8b0db9db
SW		 748 retval = access_remote_vm(mm, src, page, this_len, 0);
749 if (!retval) {
1da177e4
LT		 750 if (!ret)
751 ret = -EIO;
752 break;
753 }
754
755 if (copy_to_user(buf, page, retval)) {
756 ret = -EFAULT;
757 break;
758 }
759
760 ret += retval;
761 src += retval;
762 buf += retval;
763 count -= retval;
764 }
765 *ppos = src;
766
767out_put:
768 mmput(mm);
769out_free:
770 free_page((unsigned long) page);
771out:
99f89551
EB		 772 put_task_struct(task);
773out_no_task:
1da177e4
LT		 774 return ret;
775}
776
63967fa9 777static ssize_t mem_write(struct file * file, const char __user *buf,
1da177e4
LT		 778 size_t count, loff_t *ppos)
779{
f7ca54f4 780 int copied;
1da177e4 781 char *page;
2fddfeef 782 struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode);
1da177e4 783 unsigned long dst = *ppos;
8b0db9db 784 struct mm_struct *mm;
1da177e4 785
99f89551
EB		 786 copied = -ESRCH;
787 if (!task)
788 goto out_no_task;
789
30cd8903
KM		 790 copied = -ENOMEM;
791 page = (char *)__get_free_page(GFP_TEMPORARY);
792 if (!page)
793 goto out_task;
794
8b0db9db
SW		 795 mm = check_mem_permission(task);
796 copied = PTR_ERR(mm);
797 if (IS_ERR(mm))
30cd8903 798 goto out_free;
1da177e4 799
26947f8c
SW		 800 copied = -EIO;
801 if (file->private_data != (void *)((long)current->self_exec_id))
8b0db9db 802 goto out_mm;
1da177e4 803
f7ca54f4 804 copied = 0;
1da177e4
LT		 805 while (count > 0) {
806 int this_len, retval;
807
808 this_len = (count > PAGE_SIZE) ? PAGE_SIZE : count;
809 if (copy_from_user(page, buf, this_len)) {
810 copied = -EFAULT;
811 break;
812 }
8b0db9db 813 retval = access_remote_vm(mm, dst, page, this_len, 1);
1da177e4
LT		 814 if (!retval) {
815 if (!copied)
816 copied = -EIO;
817 break;
818 }
819 copied += retval;
820 buf += retval;
821 dst += retval;
822 count -= retval;
823 }
824 *ppos = dst;
30cd8903 825
8b0db9db
SW		 826out_mm:
827 mmput(mm);
30cd8903
KM		 828out_free:
829 free_page((unsigned long) page);
8b0db9db 830out_task:
99f89551
EB		 831 put_task_struct(task);
832out_no_task:
1da177e4
LT		 833 return copied;
834}
1da177e4 835
85863e47 836loff_t mem_lseek(struct file *file, loff_t offset, int orig)
1da177e4
LT		 837{
838 switch (orig) {
839 case 0:
840 file->f_pos = offset;
841 break;
842 case 1:
843 file->f_pos += offset;
844 break;
845 default:
846 return -EINVAL;
847 }
848 force_successful_syscall_return();
849 return file->f_pos;
850}
851
00977a59 852static const struct file_operations proc_mem_operations = {
1da177e4
LT		 853 .llseek = mem_lseek,
854 .read = mem_read,
855 .write = mem_write,
856 .open = mem_open,
857};
858
315e28c8
JP		 859static ssize_t environ_read(struct file *file, char __user *buf,
860 size_t count, loff_t *ppos)
861{
862 struct task_struct *task = get_proc_task(file->f_dentry->d_inode);
863 char *page;
864 unsigned long src = *ppos;
865 int ret = -ESRCH;
866 struct mm_struct *mm;
867
868 if (!task)
869 goto out_no_task;
870
315e28c8
JP		 871 ret = -ENOMEM;
872 page = (char *)__get_free_page(GFP_TEMPORARY);
873 if (!page)
874 goto out;
875
315e28c8 876
d6f64b89
AV		 877 mm = mm_for_maps(task);
878 ret = PTR_ERR(mm);
879 if (!mm || IS_ERR(mm))
315e28c8
JP		 880 goto out_free;
881
d6f64b89 882 ret = 0;
315e28c8
JP		 883 while (count > 0) {
884 int this_len, retval, max_len;
885
886 this_len = mm->env_end - (mm->env_start + src);
887
888 if (this_len <= 0)
889 break;
890
891 max_len = (count > PAGE_SIZE) ? PAGE_SIZE : count;
892 this_len = (this_len > max_len) ? max_len : this_len;
893
894 retval = access_process_vm(task, (mm->env_start + src),
895 page, this_len, 0);
896
897 if (retval <= 0) {
898 ret = retval;
899 break;
900 }
901
902 if (copy_to_user(buf, page, retval)) {
903 ret = -EFAULT;
904 break;
905 }
906
907 ret += retval;
908 src += retval;
909 buf += retval;
910 count -= retval;
911 }
912 *ppos = src;
913
914 mmput(mm);
915out_free:
916 free_page((unsigned long) page);
917out:
918 put_task_struct(task);
919out_no_task:
920 return ret;
921}
922
923static const struct file_operations proc_environ_operations = {
924 .read = environ_read,
87df8424 925 .llseek = generic_file_llseek,
315e28c8
JP		 926};
927
1da177e4
LT		 928static ssize_t oom_adjust_read(struct file *file, char __user *buf,
929 size_t count, loff_t *ppos)
930{
2fddfeef 931 struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode);
8578cea7 932 char buffer[PROC_NUMBUF];
1da177e4 933 size_t len;
28b83c51
KM		 934 int oom_adjust = OOM_DISABLE;
935 unsigned long flags;
1da177e4 936
99f89551
EB		 937 if (!task)
938 return -ESRCH;
28b83c51
KM		 939
940 if (lock_task_sighand(task, &flags)) {
941 oom_adjust = task->signal->oom_adj;
942 unlock_task_sighand(task, &flags);
943 }
944
99f89551
EB		 945 put_task_struct(task);
946
8578cea7 947 len = snprintf(buffer, sizeof(buffer), "%i\n", oom_adjust);
0c28f287
AM		 948
949 return simple_read_from_buffer(buf, count, ppos, buffer, len);
1da177e4
LT		 950}
951
952static ssize_t oom_adjust_write(struct file *file, const char __user *buf,
953 size_t count, loff_t *ppos)
954{
99f89551 955 struct task_struct *task;
5d863b89 956 char buffer[PROC_NUMBUF];
0a8cb8e3 957 int oom_adjust;
28b83c51 958 unsigned long flags;
5d863b89 959 int err;
1da177e4 960
8578cea7
EB		 961 memset(buffer, 0, sizeof(buffer));
962 if (count > sizeof(buffer) - 1)
963 count = sizeof(buffer) - 1;
723548bf
DR		 964 if (copy_from_user(buffer, buf, count)) {
965 err = -EFAULT;
966 goto out;
967 }
5d863b89 968
0a8cb8e3 969 err = kstrtoint(strstrip(buffer), 0, &oom_adjust);
5d863b89 970 if (err)
723548bf 971 goto out;
8ac773b4 972 if ((oom_adjust < OOM_ADJUST_MIN || oom_adjust > OOM_ADJUST_MAX) &&
723548bf
DR		 973 oom_adjust != OOM_DISABLE) {
974 err = -EINVAL;
975 goto out;
976 }
5d863b89 977
2fddfeef 978 task = get_proc_task(file->f_path.dentry->d_inode);
723548bf
DR		 979 if (!task) {
980 err = -ESRCH;
981 goto out;
982 }
d19d5476
DR		 983
984 task_lock(task);
985 if (!task->mm) {
986 err = -EINVAL;
987 goto err_task_lock;
988 }
989
28b83c51 990 if (!lock_task_sighand(task, &flags)) {
723548bf 991 err = -ESRCH;
d19d5476 992 goto err_task_lock;
28b83c51
KM		 993 }
994
995 if (oom_adjust < task->signal->oom_adj && !capable(CAP_SYS_RESOURCE)) {
723548bf
DR		 996 err = -EACCES;
997 goto err_sighand;
8fb4fc68 998 }
28b83c51 999
51b1bd2a
DR		 1000 /*
1001 * Warn that /proc/pid/oom_adj is deprecated, see
1002 * Documentation/feature-removal-schedule.txt.
1003 */
c2142704 1004 printk_once(KERN_WARNING "%s (%d): /proc/%d/oom_adj is deprecated, please use /proc/%d/oom_score_adj instead.\n",
be8f684d
DR		 1005 current->comm, task_pid_nr(current), task_pid_nr(task),
1006 task_pid_nr(task));
28b83c51 1007 task->signal->oom_adj = oom_adjust;
a63d83f4
DR		 1008 /*
1009 * Scale /proc/pid/oom_score_adj appropriately ensuring that a maximum
1010 * value is always attainable.
1011 */
1012 if (task->signal->oom_adj == OOM_ADJUST_MAX)
1013 task->signal->oom_score_adj = OOM_SCORE_ADJ_MAX;
1014 else
1015 task->signal->oom_score_adj = (oom_adjust * OOM_SCORE_ADJ_MAX) /
1016 -OOM_DISABLE;
43d2b113 1017 trace_oom_score_adj_update(task);
723548bf 1018err_sighand:
28b83c51 1019 unlock_task_sighand(task, &flags);
d19d5476
DR		 1020err_task_lock:
1021 task_unlock(task);
99f89551 1022 put_task_struct(task);
723548bf
DR		 1023out:
1024 return err < 0 ? err : count;
1da177e4
LT		 1025}
1026
00977a59 1027static const struct file_operations proc_oom_adjust_operations = {
1da177e4
LT		 1028 .read = oom_adjust_read,
1029 .write = oom_adjust_write,
87df8424 1030 .llseek = generic_file_llseek,
1da177e4
LT		 1031};
1032
a63d83f4
DR		 1033static ssize_t oom_score_adj_read(struct file *file, char __user *buf,
1034 size_t count, loff_t *ppos)
1035{
1036 struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode);
1037 char buffer[PROC_NUMBUF];
1038 int oom_score_adj = OOM_SCORE_ADJ_MIN;
1039 unsigned long flags;
1040 size_t len;
1041
1042 if (!task)
1043 return -ESRCH;
1044 if (lock_task_sighand(task, &flags)) {
1045 oom_score_adj = task->signal->oom_score_adj;
1046 unlock_task_sighand(task, &flags);
1047 }
1048 put_task_struct(task);
1049 len = snprintf(buffer, sizeof(buffer), "%d\n", oom_score_adj);
1050 return simple_read_from_buffer(buf, count, ppos, buffer, len);
1051}
1052
1053static ssize_t oom_score_adj_write(struct file *file, const char __user *buf,
1054 size_t count, loff_t *ppos)
1055{
1056 struct task_struct *task;
1057 char buffer[PROC_NUMBUF];
1058 unsigned long flags;
0a8cb8e3 1059 int oom_score_adj;
a63d83f4
DR		 1060 int err;
1061
1062 memset(buffer, 0, sizeof(buffer));
1063 if (count > sizeof(buffer) - 1)
1064 count = sizeof(buffer) - 1;
723548bf
DR		 1065 if (copy_from_user(buffer, buf, count)) {
1066 err = -EFAULT;
1067 goto out;
1068 }
a63d83f4 1069
0a8cb8e3 1070 err = kstrtoint(strstrip(buffer), 0, &oom_score_adj);
a63d83f4 1071 if (err)
723548bf 1072 goto out;
a63d83f4 1073 if (oom_score_adj < OOM_SCORE_ADJ_MIN ||
723548bf
DR		 1074 oom_score_adj > OOM_SCORE_ADJ_MAX) {
1075 err = -EINVAL;
1076 goto out;
1077 }
a63d83f4
DR		 1078
1079 task = get_proc_task(file->f_path.dentry->d_inode);
723548bf
DR		 1080 if (!task) {
1081 err = -ESRCH;
1082 goto out;
1083 }
d19d5476
DR		 1084
1085 task_lock(task);
1086 if (!task->mm) {
1087 err = -EINVAL;
1088 goto err_task_lock;
1089 }
1090
a63d83f4 1091 if (!lock_task_sighand(task, &flags)) {
723548bf 1092 err = -ESRCH;
d19d5476 1093 goto err_task_lock;
a63d83f4 1094 }
d19d5476 1095
dabb16f6 1096 if (oom_score_adj < task->signal->oom_score_adj_min &&
a63d83f4 1097 !capable(CAP_SYS_RESOURCE)) {
723548bf
DR		 1098 err = -EACCES;
1099 goto err_sighand;
a63d83f4
DR		 1100 }
1101
1102 task->signal->oom_score_adj = oom_score_adj;
dabb16f6
MSB		 1103 if (has_capability_noaudit(current, CAP_SYS_RESOURCE))
1104 task->signal->oom_score_adj_min = oom_score_adj;
43d2b113 1105 trace_oom_score_adj_update(task);
a63d83f4
DR		 1106 /*
1107 * Scale /proc/pid/oom_adj appropriately ensuring that OOM_DISABLE is
1108 * always attainable.
1109 */
1110 if (task->signal->oom_score_adj == OOM_SCORE_ADJ_MIN)
1111 task->signal->oom_adj = OOM_DISABLE;
1112 else
1113 task->signal->oom_adj = (oom_score_adj * OOM_ADJUST_MAX) /
1114 OOM_SCORE_ADJ_MAX;
723548bf 1115err_sighand:
a63d83f4 1116 unlock_task_sighand(task, &flags);
d19d5476
DR		 1117err_task_lock:
1118 task_unlock(task);
a63d83f4 1119 put_task_struct(task);
723548bf
DR		 1120out:
1121 return err < 0 ? err : count;
a63d83f4
DR		 1122}
1123
1124static const struct file_operations proc_oom_score_adj_operations = {
1125 .read = oom_score_adj_read,
1126 .write = oom_score_adj_write,
6038f373 1127 .llseek = default_llseek,
a63d83f4
DR		 1128};
1129
1da177e4
LT		 1130#ifdef CONFIG_AUDITSYSCALL
1131#define TMPBUFLEN 21
1132static ssize_t proc_loginuid_read(struct file * file, char __user * buf,
1133 size_t count, loff_t *ppos)
1134{
2fddfeef 1135 struct inode * inode = file->f_path.dentry->d_inode;
99f89551 1136 struct task_struct *task = get_proc_task(inode);
1da177e4
LT		 1137 ssize_t length;
1138 char tmpbuf[TMPBUFLEN];
1139
99f89551
EB		 1140 if (!task)
1141 return -ESRCH;
1da177e4 1142 length = scnprintf(tmpbuf, TMPBUFLEN, "%u",
0c11b942 1143 audit_get_loginuid(task));
99f89551 1144 put_task_struct(task);
1da177e4
LT		 1145 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1146}
1147
1148static ssize_t proc_loginuid_write(struct file * file, const char __user * buf,
1149 size_t count, loff_t *ppos)
1150{
2fddfeef 1151 struct inode * inode = file->f_path.dentry->d_inode;
1da177e4
LT		 1152 char *page, *tmp;
1153 ssize_t length;
1da177e4
LT		 1154 uid_t loginuid;
1155
1156 if (!capable(CAP_AUDIT_CONTROL))
1157 return -EPERM;
1158
7dc52157
PM		 1159 rcu_read_lock();
1160 if (current != pid_task(proc_pid(inode), PIDTYPE_PID)) {
1161 rcu_read_unlock();
1da177e4 1162 return -EPERM;
7dc52157
PM		 1163 }
1164 rcu_read_unlock();
1da177e4 1165
e0182909
AV		 1166 if (count >= PAGE_SIZE)
1167 count = PAGE_SIZE - 1;
1da177e4
LT		 1168
1169 if (*ppos != 0) {
1170 /* No partial writes. */
1171 return -EINVAL;
1172 }
e12ba74d 1173 page = (char*)__get_free_page(GFP_TEMPORARY);
1da177e4
LT		 1174 if (!page)
1175 return -ENOMEM;
1176 length = -EFAULT;
1177 if (copy_from_user(page, buf, count))
1178 goto out_free_page;
1179
e0182909 1180 page[count] = '\0';
1da177e4
LT		 1181 loginuid = simple_strtoul(page, &tmp, 10);
1182 if (tmp == page) {
1183 length = -EINVAL;
1184 goto out_free_page;
1185
1186 }
99f89551 1187 length = audit_set_loginuid(current, loginuid);
1da177e4
LT		 1188 if (likely(length == 0))
1189 length = count;
1190
1191out_free_page:
1192 free_page((unsigned long) page);
1193 return length;
1194}
1195
00977a59 1196static const struct file_operations proc_loginuid_operations = {
1da177e4
LT		 1197 .read = proc_loginuid_read,
1198 .write = proc_loginuid_write,
87df8424 1199 .llseek = generic_file_llseek,
1da177e4 1200};
1e0bd755
EP		 1201
1202static ssize_t proc_sessionid_read(struct file * file, char __user * buf,
1203 size_t count, loff_t *ppos)
1204{
1205 struct inode * inode = file->f_path.dentry->d_inode;
1206 struct task_struct *task = get_proc_task(inode);
1207 ssize_t length;
1208 char tmpbuf[TMPBUFLEN];
1209
1210 if (!task)
1211 return -ESRCH;
1212 length = scnprintf(tmpbuf, TMPBUFLEN, "%u",
1213 audit_get_sessionid(task));
1214 put_task_struct(task);
1215 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1216}
1217
1218static const struct file_operations proc_sessionid_operations = {
1219 .read = proc_sessionid_read,
87df8424 1220 .llseek = generic_file_llseek,
1e0bd755 1221};
1da177e4
LT		 1222#endif
1223
f4f154fd
AM		 1224#ifdef CONFIG_FAULT_INJECTION
1225static ssize_t proc_fault_inject_read(struct file * file, char __user * buf,
1226 size_t count, loff_t *ppos)
1227{
1228 struct task_struct *task = get_proc_task(file->f_dentry->d_inode);
1229 char buffer[PROC_NUMBUF];
1230 size_t len;
1231 int make_it_fail;
f4f154fd
AM		 1232
1233 if (!task)
1234 return -ESRCH;
1235 make_it_fail = task->make_it_fail;
1236 put_task_struct(task);
1237
1238 len = snprintf(buffer, sizeof(buffer), "%i\n", make_it_fail);
0c28f287
AM		 1239
1240 return simple_read_from_buffer(buf, count, ppos, buffer, len);
f4f154fd
AM		 1241}
1242
1243static ssize_t proc_fault_inject_write(struct file * file,
1244 const char __user * buf, size_t count, loff_t *ppos)
1245{
1246 struct task_struct *task;
1247 char buffer[PROC_NUMBUF], *end;
1248 int make_it_fail;
1249
1250 if (!capable(CAP_SYS_RESOURCE))
1251 return -EPERM;
1252 memset(buffer, 0, sizeof(buffer));
1253 if (count > sizeof(buffer) - 1)
1254 count = sizeof(buffer) - 1;
1255 if (copy_from_user(buffer, buf, count))
1256 return -EFAULT;
cba8aafe
VL		 1257 make_it_fail = simple_strtol(strstrip(buffer), &end, 0);
1258 if (*end)
1259 return -EINVAL;
f4f154fd
AM		 1260 task = get_proc_task(file->f_dentry->d_inode);
1261 if (!task)
1262 return -ESRCH;
1263 task->make_it_fail = make_it_fail;
1264 put_task_struct(task);
cba8aafe
VL		 1265
1266 return count;
f4f154fd
AM		 1267}
1268
00977a59 1269static const struct file_operations proc_fault_inject_operations = {
f4f154fd
AM		 1270 .read = proc_fault_inject_read,
1271 .write = proc_fault_inject_write,
87df8424 1272 .llseek = generic_file_llseek,
f4f154fd
AM		 1273};
1274#endif
1275
9745512c 1276
43ae34cb
IM		 1277#ifdef CONFIG_SCHED_DEBUG
1278/*
1279 * Print out various scheduling related per-task fields:
1280 */
1281static int sched_show(struct seq_file *m, void *v)
1282{
1283 struct inode *inode = m->private;
1284 struct task_struct *p;
1285
43ae34cb
IM		 1286 p = get_proc_task(inode);
1287 if (!p)
1288 return -ESRCH;
1289 proc_sched_show_task(p, m);
1290
1291 put_task_struct(p);
1292
1293 return 0;
1294}
1295
1296static ssize_t
1297sched_write(struct file *file, const char __user *buf,
1298 size_t count, loff_t *offset)
1299{
1300 struct inode *inode = file->f_path.dentry->d_inode;
1301 struct task_struct *p;
1302
43ae34cb
IM		 1303 p = get_proc_task(inode);
1304 if (!p)
1305 return -ESRCH;
1306 proc_sched_set_task(p);
1307
1308 put_task_struct(p);
1309
1310 return count;
1311}
1312
1313static int sched_open(struct inode *inode, struct file *filp)
1314{
c6a34058 1315 return single_open(filp, sched_show, inode);
43ae34cb
IM		 1316}
1317
1318static const struct file_operations proc_pid_sched_operations = {
1319 .open = sched_open,
1320 .read = seq_read,
1321 .write = sched_write,
1322 .llseek = seq_lseek,
5ea473a1 1323 .release = single_release,
43ae34cb
IM		 1324};
1325
1326#endif
1327
5091faa4
MG		 1328#ifdef CONFIG_SCHED_AUTOGROUP
1329/*
1330 * Print out autogroup related information:
1331 */
1332static int sched_autogroup_show(struct seq_file *m, void *v)
1333{
1334 struct inode *inode = m->private;
1335 struct task_struct *p;
1336
1337 p = get_proc_task(inode);
1338 if (!p)
1339 return -ESRCH;
1340 proc_sched_autogroup_show_task(p, m);
1341
1342 put_task_struct(p);
1343
1344 return 0;
1345}
1346
1347static ssize_t
1348sched_autogroup_write(struct file *file, const char __user *buf,
1349 size_t count, loff_t *offset)
1350{
1351 struct inode *inode = file->f_path.dentry->d_inode;
1352 struct task_struct *p;
1353 char buffer[PROC_NUMBUF];
0a8cb8e3 1354 int nice;
5091faa4
MG		 1355 int err;
1356
1357 memset(buffer, 0, sizeof(buffer));
1358 if (count > sizeof(buffer) - 1)
1359 count = sizeof(buffer) - 1;
1360 if (copy_from_user(buffer, buf, count))
1361 return -EFAULT;
1362
0a8cb8e3
AD		 1363 err = kstrtoint(strstrip(buffer), 0, &nice);
1364 if (err < 0)
1365 return err;
5091faa4
MG		 1366
1367 p = get_proc_task(inode);
1368 if (!p)
1369 return -ESRCH;
1370
1371 err = nice;
1372 err = proc_sched_autogroup_set_nice(p, &err);
1373 if (err)
1374 count = err;
1375
1376 put_task_struct(p);
1377
1378 return count;
1379}
1380
1381static int sched_autogroup_open(struct inode *inode, struct file *filp)
1382{
1383 int ret;
1384
1385 ret = single_open(filp, sched_autogroup_show, NULL);
1386 if (!ret) {
1387 struct seq_file *m = filp->private_data;
1388
1389 m->private = inode;
1390 }
1391 return ret;
1392}
1393
1394static const struct file_operations proc_pid_sched_autogroup_operations = {
1395 .open = sched_autogroup_open,
1396 .read = seq_read,
1397 .write = sched_autogroup_write,
1398 .llseek = seq_lseek,
1399 .release = single_release,
1400};
1401
1402#endif /* CONFIG_SCHED_AUTOGROUP */
1403
4614a696
JS		 1404static ssize_t comm_write(struct file *file, const char __user *buf,
1405 size_t count, loff_t *offset)
1406{
1407 struct inode *inode = file->f_path.dentry->d_inode;
1408 struct task_struct *p;
1409 char buffer[TASK_COMM_LEN];
1410
1411 memset(buffer, 0, sizeof(buffer));
1412 if (count > sizeof(buffer) - 1)
1413 count = sizeof(buffer) - 1;
1414 if (copy_from_user(buffer, buf, count))
1415 return -EFAULT;
1416
1417 p = get_proc_task(inode);
1418 if (!p)
1419 return -ESRCH;
1420
1421 if (same_thread_group(current, p))
1422 set_task_comm(p, buffer);
1423 else
1424 count = -EINVAL;
1425
1426 put_task_struct(p);
1427
1428 return count;
1429}
1430
1431static int comm_show(struct seq_file *m, void *v)
1432{
1433 struct inode *inode = m->private;
1434 struct task_struct *p;
1435
1436 p = get_proc_task(inode);
1437 if (!p)
1438 return -ESRCH;
1439
1440 task_lock(p);
1441 seq_printf(m, "%s\n", p->comm);
1442 task_unlock(p);
1443
1444 put_task_struct(p);
1445
1446 return 0;
1447}
1448
1449static int comm_open(struct inode *inode, struct file *filp)
1450{
c6a34058 1451 return single_open(filp, comm_show, inode);
4614a696
JS		 1452}
1453
1454static const struct file_operations proc_pid_set_comm_operations = {
1455 .open = comm_open,
1456 .read = seq_read,
1457 .write = comm_write,
1458 .llseek = seq_lseek,
1459 .release = single_release,
1460};
1461
7773fbc5 1462static int proc_exe_link(struct dentry *dentry, struct path *exe_path)
925d1c40
MH		 1463{
1464 struct task_struct *task;
1465 struct mm_struct *mm;
1466 struct file *exe_file;
1467
7773fbc5 1468 task = get_proc_task(dentry->d_inode);
925d1c40
MH		 1469 if (!task)
1470 return -ENOENT;
1471 mm = get_task_mm(task);
1472 put_task_struct(task);
1473 if (!mm)
1474 return -ENOENT;
1475 exe_file = get_mm_exe_file(mm);
1476 mmput(mm);
1477 if (exe_file) {
1478 *exe_path = exe_file->f_path;
1479 path_get(&exe_file->f_path);
1480 fput(exe_file);
1481 return 0;
1482 } else
1483 return -ENOENT;
1484}
1485
008b150a 1486static void *proc_pid_follow_link(struct dentry *dentry, struct nameidata *nd)
1da177e4
LT		 1487{
1488 struct inode *inode = dentry->d_inode;
1489 int error = -EACCES;
1490
1491 /* We don't need a base pointer in the /proc filesystem */
1d957f9b 1492 path_put(&nd->path);
1da177e4 1493
778c1144
EB		 1494 /* Are we allowed to snoop on the tasks file descriptors? */
1495 if (!proc_fd_access_allowed(inode))
1da177e4 1496 goto out;
1da177e4 1497
7773fbc5 1498 error = PROC_I(inode)->op.proc_get_link(dentry, &nd->path);
1da177e4 1499out:
008b150a 1500 return ERR_PTR(error);
1da177e4
LT		 1501}
1502
3dcd25f3 1503static int do_proc_readlink(struct path *path, char __user *buffer, int buflen)
1da177e4 1504{
e12ba74d 1505 char *tmp = (char*)__get_free_page(GFP_TEMPORARY);
3dcd25f3 1506 char *pathname;
1da177e4
LT		 1507 int len;
1508
1509 if (!tmp)
1510 return -ENOMEM;
0c28f287 1511
7b2a69ba 1512 pathname = d_path(path, tmp, PAGE_SIZE);
3dcd25f3
JB		 1513 len = PTR_ERR(pathname);
1514 if (IS_ERR(pathname))
1da177e4 1515 goto out;
3dcd25f3 1516 len = tmp + PAGE_SIZE - 1 - pathname;
1da177e4
LT		 1517
1518 if (len > buflen)
1519 len = buflen;
3dcd25f3 1520 if (copy_to_user(buffer, pathname, len))
1da177e4
LT		 1521 len = -EFAULT;
1522 out:
1523 free_page((unsigned long)tmp);
1524 return len;
1525}
1526
1527static int proc_pid_readlink(struct dentry * dentry, char __user * buffer, int buflen)
1528{
1529 int error = -EACCES;
1530 struct inode *inode = dentry->d_inode;
3dcd25f3 1531 struct path path;
1da177e4 1532
778c1144
EB		 1533 /* Are we allowed to snoop on the tasks file descriptors? */
1534 if (!proc_fd_access_allowed(inode))
1da177e4 1535 goto out;
1da177e4 1536
7773fbc5 1537 error = PROC_I(inode)->op.proc_get_link(dentry, &path);
1da177e4
LT		 1538 if (error)
1539 goto out;
1540
3dcd25f3
JB		 1541 error = do_proc_readlink(&path, buffer, buflen);
1542 path_put(&path);
1da177e4 1543out:
1da177e4
LT		 1544 return error;
1545}
1546
c5ef1c42 1547static const struct inode_operations proc_pid_link_inode_operations = {
1da177e4 1548 .readlink = proc_pid_readlink,
6d76fa58
LT		 1549 .follow_link = proc_pid_follow_link,
1550 .setattr = proc_setattr,
1da177e4
LT		 1551};
1552
28a6d671
EB		 1553
1554/* building an inode */
1555
1556static int task_dumpable(struct task_struct *task)
1da177e4 1557{
28a6d671
EB		 1558 int dumpable = 0;
1559 struct mm_struct *mm;
1da177e4 1560
28a6d671
EB		 1561 task_lock(task);
1562 mm = task->mm;
1563 if (mm)
6c5d5238 1564 dumpable = get_dumpable(mm);
28a6d671
EB		 1565 task_unlock(task);
1566 if(dumpable == 1)
1567 return 1;
1568 return 0;
1569}
1da177e4 1570
6b4e306a 1571struct inode *proc_pid_make_inode(struct super_block * sb, struct task_struct *task)
28a6d671
EB		 1572{
1573 struct inode * inode;
1574 struct proc_inode *ei;
c69e8d9c 1575 const struct cred *cred;
1da177e4 1576
28a6d671 1577 /* We need a new inode */
1da177e4 1578
28a6d671
EB		 1579 inode = new_inode(sb);
1580 if (!inode)
1581 goto out;
1582
1583 /* Common stuff */
1584 ei = PROC_I(inode);
85fe4025 1585 inode->i_ino = get_next_ino();
28a6d671 1586 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
28a6d671
EB		 1587 inode->i_op = &proc_def_inode_operations;
1588
1589 /*
1590 * grab the reference to task.
1591 */
1a657f78 1592 ei->pid = get_task_pid(task, PIDTYPE_PID);
28a6d671
EB		 1593 if (!ei->pid)
1594 goto out_unlock;
1595
28a6d671 1596 if (task_dumpable(task)) {
c69e8d9c
DH		 1597 rcu_read_lock();
1598 cred = __task_cred(task);
1599 inode->i_uid = cred->euid;
1600 inode->i_gid = cred->egid;
1601 rcu_read_unlock();
1da177e4 1602 }
28a6d671
EB		 1603 security_task_to_inode(task, inode);
1604
1da177e4 1605out:
28a6d671
EB		 1606 return inode;
1607
1608out_unlock:
1609 iput(inode);
1610 return NULL;
1da177e4
LT		 1611}
1612
6b4e306a 1613int pid_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
1da177e4 1614{
1da177e4 1615 struct inode *inode = dentry->d_inode;
28a6d671 1616 struct task_struct *task;
c69e8d9c
DH		 1617 const struct cred *cred;
1618
28a6d671 1619 generic_fillattr(inode, stat);
1da177e4 1620
28a6d671
EB		 1621 rcu_read_lock();
1622 stat->uid = 0;
1623 stat->gid = 0;
1624 task = pid_task(proc_pid(inode), PIDTYPE_PID);
1625 if (task) {
1626 if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) ||
1627 task_dumpable(task)) {
c69e8d9c
DH		 1628 cred = __task_cred(task);
1629 stat->uid = cred->euid;
1630 stat->gid = cred->egid;
1da177e4
LT		 1631 }
1632 }
28a6d671 1633 rcu_read_unlock();
d6e71144 1634 return 0;
1da177e4
LT		 1635}
1636
1da177e4
LT		 1637/* dentry stuff */
1638
1639/*
1640 * Exceptional case: normally we are not allowed to unhash a busy
1641 * directory. In this case, however, we can do it - no aliasing problems
1642 * due to the way we treat inodes.
1643 *
1644 * Rewrite the inode's ownerships here because the owning task may have
1645 * performed a setuid(), etc.
99f89551
EB		 1646 *
1647 * Before the /proc/pid/status file was created the only way to read
1648 * the effective uid of a /process was to stat /proc/pid. Reading
1649 * /proc/pid/status is slow enough that procps and other packages
1650 * kept stating /proc/pid. To keep the rules in /proc simple I have
1651 * made this apply to all per process world readable and executable
1652 * directories.
1da177e4 1653 */
6b4e306a 1654int pid_revalidate(struct dentry *dentry, struct nameidata *nd)
1da177e4 1655{
34286d66
NP		 1656 struct inode *inode;
1657 struct task_struct *task;
c69e8d9c
DH		 1658 const struct cred *cred;
1659
34286d66
NP		 1660 if (nd && nd->flags & LOOKUP_RCU)
1661 return -ECHILD;
1662
1663 inode = dentry->d_inode;
1664 task = get_proc_task(inode);
1665
99f89551
EB		 1666 if (task) {
1667 if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) ||
1668 task_dumpable(task)) {
c69e8d9c
DH		 1669 rcu_read_lock();
1670 cred = __task_cred(task);
1671 inode->i_uid = cred->euid;
1672 inode->i_gid = cred->egid;
1673 rcu_read_unlock();
1da177e4
LT		 1674 } else {
1675 inode->i_uid = 0;
1676 inode->i_gid = 0;
1677 }
9ee8ab9f 1678 inode->i_mode &= ~(S_ISUID | S_ISGID);
1da177e4 1679 security_task_to_inode(task, inode);
99f89551 1680 put_task_struct(task);
1da177e4
LT		 1681 return 1;
1682 }
1683 d_drop(dentry);
1684 return 0;
1685}
1686
fe15ce44 1687static int pid_delete_dentry(const struct dentry * dentry)
99f89551 1688{
28a6d671
EB		 1689 /* Is the task we represent dead?
1690 * If so, then don't put the dentry on the lru list,
1691 * kill it immediately.
1692 */
1693 return !proc_pid(dentry->d_inode)->tasks[PIDTYPE_PID].first;
1694}
1695
6b4e306a 1696const struct dentry_operations pid_dentry_operations =
28a6d671
EB		 1697{
1698 .d_revalidate = pid_revalidate,
1699 .d_delete = pid_delete_dentry,
1700};
1701
1702/* Lookups */
1703
1c0d04c9
EB		 1704/*
1705 * Fill a directory entry.
1706 *
1707 * If possible create the dcache entry and derive our inode number and
1708 * file type from dcache entry.
1709 *
1710 * Since all of the proc inode numbers are dynamically generated, the inode
1711 * numbers do not exist until the inode is cache. This means creating the
1712 * the dcache entry in readdir is necessary to keep the inode numbers
1713 * reported by readdir in sync with the inode numbers reported
1714 * by stat.
1715 */
6b4e306a
EB		 1716int proc_fill_cache(struct file *filp, void *dirent, filldir_t filldir,
1717 const char *name, int len,
c5141e6d 1718 instantiate_t instantiate, struct task_struct *task, const void *ptr)
61a28784 1719{
2fddfeef 1720 struct dentry *child, *dir = filp->f_path.dentry;
61a28784
EB		 1721 struct inode *inode;
1722 struct qstr qname;
1723 ino_t ino = 0;
1724 unsigned type = DT_UNKNOWN;
1725
1726 qname.name = name;
1727 qname.len = len;
1728 qname.hash = full_name_hash(name, len);
1729
1730 child = d_lookup(dir, &qname);
1731 if (!child) {
1732 struct dentry *new;
1733 new = d_alloc(dir, &qname);
1734 if (new) {
1735 child = instantiate(dir->d_inode, new, task, ptr);
1736 if (child)
1737 dput(new);
1738 else
1739 child = new;
1740 }
1741 }
1742 if (!child || IS_ERR(child) || !child->d_inode)
1743 goto end_instantiate;
1744 inode = child->d_inode;
1745 if (inode) {
1746 ino = inode->i_ino;
1747 type = inode->i_mode >> 12;
1748 }
1749 dput(child);
1750end_instantiate:
1751 if (!ino)
1752 ino = find_inode_number(dir, &qname);
1753 if (!ino)
1754 ino = 1;
1755 return filldir(dirent, name, len, filp->f_pos, ino, type);
1756}
1757
28a6d671
EB		 1758static unsigned name_to_int(struct dentry *dentry)
1759{
1760 const char *name = dentry->d_name.name;
1761 int len = dentry->d_name.len;
1762 unsigned n = 0;
1763
1764 if (len > 1 && *name == '0')
1765 goto out;
1766 while (len-- > 0) {
1767 unsigned c = *name++ - '0';
1768 if (c > 9)
1769 goto out;
1770 if (n >= (~0U-9)/10)
1771 goto out;
1772 n *= 10;
1773 n += c;
1774 }
1775 return n;
1776out:
1777 return ~0U;
1778}
1779
27932742
MS		 1780#define PROC_FDINFO_MAX 64
1781
3dcd25f3 1782static int proc_fd_info(struct inode *inode, struct path *path, char *info)
28a6d671 1783{
5e442a49
LT		 1784 struct task_struct *task = get_proc_task(inode);
1785 struct files_struct *files = NULL;
28a6d671
EB		 1786 struct file *file;
1787 int fd = proc_fd(inode);
aa6afca5 1788
5e442a49
LT		 1789 if (task) {
1790 files = get_files_struct(task);
1791 put_task_struct(task);
1792 }
1793 if (files) {
1794 /*
1795 * We are not taking a ref to the file structure, so we must
1796 * hold ->file_lock.
1797 */
1798 spin_lock(&files->file_lock);
1799 file = fcheck_files(files, fd);
1800 if (file) {
1801 unsigned int f_flags;
1802 struct fdtable *fdt;
1803
1804 fdt = files_fdtable(files);
1805 f_flags = file->f_flags & ~O_CLOEXEC;
1806 if (FD_ISSET(fd, fdt->close_on_exec))
1807 f_flags |= O_CLOEXEC;
1808
1809 if (path) {
1810 *path = file->f_path;
1811 path_get(&file->f_path);
1812 }
1813 if (info)
1814 snprintf(info, PROC_FDINFO_MAX,
1815 "pos:\t%lli\n"
1816 "flags:\t0%o\n",
1817 (long long) file->f_pos,
1818 f_flags);
1819 spin_unlock(&files->file_lock);
1820 put_files_struct(files);
1821 return 0;
99f89551 1822 }
5e442a49
LT		 1823 spin_unlock(&files->file_lock);
1824 put_files_struct(files);
1825 }
1826 return -ENOENT;
99f89551
EB		 1827}
1828
7773fbc5 1829static int proc_fd_link(struct dentry *dentry, struct path *path)
27932742 1830{
7773fbc5 1831 return proc_fd_info(dentry->d_inode, path, NULL);
27932742
MS		 1832}
1833
1da177e4
LT		 1834static int tid_fd_revalidate(struct dentry *dentry, struct nameidata *nd)
1835{
34286d66
NP		 1836 struct inode *inode;
1837 struct task_struct *task;
1838 int fd;
1da177e4 1839 struct files_struct *files;
c69e8d9c 1840 const struct cred *cred;
1da177e4 1841
34286d66
NP		 1842 if (nd && nd->flags & LOOKUP_RCU)
1843 return -ECHILD;
1844
1845 inode = dentry->d_inode;
1846 task = get_proc_task(inode);
1847 fd = proc_fd(inode);
1848
99f89551
EB		 1849 if (task) {
1850 files = get_files_struct(task);
1851 if (files) {
1852 rcu_read_lock();
1853 if (fcheck_files(files, fd)) {
1854 rcu_read_unlock();
1855 put_files_struct(files);
1856 if (task_dumpable(task)) {
c69e8d9c
DH		 1857 rcu_read_lock();
1858 cred = __task_cred(task);
1859 inode->i_uid = cred->euid;
1860 inode->i_gid = cred->egid;
1861 rcu_read_unlock();
99f89551
EB		 1862 } else {
1863 inode->i_uid = 0;
1864 inode->i_gid = 0;
1865 }
9ee8ab9f 1866 inode->i_mode &= ~(S_ISUID | S_ISGID);
99f89551
EB		 1867 security_task_to_inode(task, inode);
1868 put_task_struct(task);
1869 return 1;
1870 }
b835996f 1871 rcu_read_unlock();
1da177e4 1872 put_files_struct(files);
1da177e4 1873 }
99f89551 1874 put_task_struct(task);
1da177e4
LT		 1875 }
1876 d_drop(dentry);
1877 return 0;
1878}
1879
d72f71eb 1880static const struct dentry_operations tid_fd_dentry_operations =
1da177e4
LT		 1881{
1882 .d_revalidate = tid_fd_revalidate,
1883 .d_delete = pid_delete_dentry,
1884};
1885
444ceed8 1886static struct dentry *proc_fd_instantiate(struct inode *dir,
c5141e6d 1887 struct dentry *dentry, struct task_struct *task, const void *ptr)
1da177e4 1888{
c5141e6d 1889 unsigned fd = *(const unsigned *)ptr;
444ceed8
EB		 1890 struct file *file;
1891 struct files_struct *files;
1892 struct inode *inode;
1893 struct proc_inode *ei;
1894 struct dentry *error = ERR_PTR(-ENOENT);
1da177e4 1895
61a28784 1896 inode = proc_pid_make_inode(dir->i_sb, task);
1da177e4
LT		 1897 if (!inode)
1898 goto out;
1899 ei = PROC_I(inode);
aed7a6c4 1900 ei->fd = fd;
1da177e4
LT		 1901 files = get_files_struct(task);
1902 if (!files)
444ceed8 1903 goto out_iput;
1da177e4 1904 inode->i_mode = S_IFLNK;
ca99c1da
DS		 1905
1906 /*
1907 * We are not taking a ref to the file structure, so we must
1908 * hold ->file_lock.
1909 */
1910 spin_lock(&files->file_lock);
1da177e4
LT		 1911 file = fcheck_files(files, fd);
1912 if (!file)
444ceed8 1913 goto out_unlock;
aeb5d727 1914 if (file->f_mode & FMODE_READ)
1da177e4 1915 inode->i_mode |= S_IRUSR | S_IXUSR;
aeb5d727 1916 if (file->f_mode & FMODE_WRITE)
1da177e4 1917 inode->i_mode |= S_IWUSR | S_IXUSR;
ca99c1da 1918 spin_unlock(&files->file_lock);
1da177e4 1919 put_files_struct(files);
444ceed8 1920
5e442a49 1921 inode->i_op = &proc_pid_link_inode_operations;
1da177e4
LT		 1922 inode->i_size = 64;
1923 ei->op.proc_get_link = proc_fd_link;
fb045adb 1924 d_set_d_op(dentry, &tid_fd_dentry_operations);
1da177e4 1925 d_add(dentry, inode);
cd6a3ce9
EB		 1926 /* Close the race of the process dying before we return the dentry */
1927 if (tid_fd_revalidate(dentry, NULL))
444ceed8 1928 error = NULL;
1da177e4 1929
444ceed8
EB		 1930 out:
1931 return error;
1932out_unlock:
ca99c1da 1933 spin_unlock(&files->file_lock);
1da177e4 1934 put_files_struct(files);
444ceed8 1935out_iput:
1da177e4 1936 iput(inode);
cd6a3ce9 1937 goto out;
1da177e4
LT		 1938}
1939
27932742
MS		 1940static struct dentry *proc_lookupfd_common(struct inode *dir,
1941 struct dentry *dentry,
1942 instantiate_t instantiate)
444ceed8
EB		 1943{
1944 struct task_struct *task = get_proc_task(dir);
1945 unsigned fd = name_to_int(dentry);
1946 struct dentry *result = ERR_PTR(-ENOENT);
1947
1948 if (!task)
1949 goto out_no_task;
1950 if (fd == ~0U)
1951 goto out;
1952
27932742 1953 result = instantiate(dir, dentry, task, &fd);
444ceed8
EB		 1954out:
1955 put_task_struct(task);
1956out_no_task:
1957 return result;
1958}
1959
27932742
MS		 1960static int proc_readfd_common(struct file * filp, void * dirent,
1961 filldir_t filldir, instantiate_t instantiate)
28a6d671 1962{
2fddfeef 1963 struct dentry *dentry = filp->f_path.dentry;
28a6d671
EB		 1964 struct inode *inode = dentry->d_inode;
1965 struct task_struct *p = get_proc_task(inode);
457c2510 1966 unsigned int fd, ino;
28a6d671 1967 int retval;
28a6d671 1968 struct files_struct * files;
1da177e4 1969
28a6d671
EB		 1970 retval = -ENOENT;
1971 if (!p)
1972 goto out_no_task;
1973 retval = 0;
28a6d671
EB		 1974
1975 fd = filp->f_pos;
1976 switch (fd) {
1977 case 0:
1978 if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0)
5e442a49 1979 goto out;
28a6d671
EB		 1980 filp->f_pos++;
1981 case 1:
1982 ino = parent_ino(dentry);
1983 if (filldir(dirent, "..", 2, 1, ino, DT_DIR) < 0)
5e442a49 1984 goto out;
28a6d671
EB		 1985 filp->f_pos++;
1986 default:
1987 files = get_files_struct(p);
1988 if (!files)
5e442a49 1989 goto out;
28a6d671 1990 rcu_read_lock();
28a6d671 1991 for (fd = filp->f_pos-2;
9b4f526c 1992 fd < files_fdtable(files)->max_fds;
28a6d671 1993 fd++, filp->f_pos++) {
27932742
MS		 1994 char name[PROC_NUMBUF];
1995 int len;
28a6d671
EB		 1996
1997 if (!fcheck_files(files, fd))
1998 continue;
1999 rcu_read_unlock();
2000
27932742
MS		 2001 len = snprintf(name, sizeof(name), "%d", fd);
2002 if (proc_fill_cache(filp, dirent, filldir,
2003 name, len, instantiate,
2004 p, &fd) < 0) {
28a6d671
EB		 2005 rcu_read_lock();
2006 break;
2007 }
2008 rcu_read_lock();
2009 }
2010 rcu_read_unlock();
2011 put_files_struct(files);
2012 }
2013out:
2014 put_task_struct(p);
2015out_no_task:
2016 return retval;
2017}
2018
27932742
MS		 2019static struct dentry *proc_lookupfd(struct inode *dir, struct dentry *dentry,
2020 struct nameidata *nd)
2021{
2022 return proc_lookupfd_common(dir, dentry, proc_fd_instantiate);
2023}
2024
2025static int proc_readfd(struct file *filp, void *dirent, filldir_t filldir)
2026{
2027 return proc_readfd_common(filp, dirent, filldir, proc_fd_instantiate);
2028}
2029
2030static ssize_t proc_fdinfo_read(struct file *file, char __user *buf,
2031 size_t len, loff_t *ppos)
2032{
2033 char tmp[PROC_FDINFO_MAX];
3dcd25f3 2034 int err = proc_fd_info(file->f_path.dentry->d_inode, NULL, tmp);
27932742
MS		 2035 if (!err)
2036 err = simple_read_from_buffer(buf, len, ppos, tmp, strlen(tmp));
2037 return err;
2038}
2039
2040static const struct file_operations proc_fdinfo_file_operations = {
87df8424 2041 .open = nonseekable_open,
27932742 2042 .read = proc_fdinfo_read,
6038f373 2043 .llseek = no_llseek,
27932742
MS		 2044};
2045
00977a59 2046static const struct file_operations proc_fd_operations = {
28a6d671
EB		 2047 .read = generic_read_dir,
2048 .readdir = proc_readfd,
6038f373 2049 .llseek = default_llseek,
1da177e4
LT		 2050};
2051
640708a2
PE		 2052#ifdef CONFIG_CHECKPOINT_RESTORE
2053
2054/*
2055 * dname_to_vma_addr - maps a dentry name into two unsigned longs
2056 * which represent vma start and end addresses.
2057 */
2058static int dname_to_vma_addr(struct dentry *dentry,
2059 unsigned long *start, unsigned long *end)
2060{
2061 if (sscanf(dentry->d_name.name, "%lx-%lx", start, end) != 2)
2062 return -EINVAL;
2063
2064 return 0;
2065}
2066
2067static int map_files_d_revalidate(struct dentry *dentry, struct nameidata *nd)
2068{
2069 unsigned long vm_start, vm_end;
2070 bool exact_vma_exists = false;
2071 struct mm_struct *mm = NULL;
2072 struct task_struct *task;
2073 const struct cred *cred;
2074 struct inode *inode;
2075 int status = 0;
2076
2077 if (nd && nd->flags & LOOKUP_RCU)
2078 return -ECHILD;
2079
2080 if (!capable(CAP_SYS_ADMIN)) {
2081 status = -EACCES;
2082 goto out_notask;
2083 }
2084
2085 inode = dentry->d_inode;
2086 task = get_proc_task(inode);
2087 if (!task)
2088 goto out_notask;
2089
2090 if (!ptrace_may_access(task, PTRACE_MODE_READ))
2091 goto out;
2092
2093 mm = get_task_mm(task);
2094 if (!mm)
2095 goto out;
2096
2097 if (!dname_to_vma_addr(dentry, &vm_start, &vm_end)) {
2098 down_read(&mm->mmap_sem);
2099 exact_vma_exists = !!find_exact_vma(mm, vm_start, vm_end);
2100 up_read(&mm->mmap_sem);
2101 }
2102
2103 mmput(mm);
2104
2105 if (exact_vma_exists) {
2106 if (task_dumpable(task)) {
2107 rcu_read_lock();
2108 cred = __task_cred(task);
2109 inode->i_uid = cred->euid;
2110 inode->i_gid = cred->egid;
2111 rcu_read_unlock();
2112 } else {
2113 inode->i_uid = 0;
2114 inode->i_gid = 0;
2115 }
2116 security_task_to_inode(task, inode);
2117 status = 1;
2118 }
2119
2120out:
2121 put_task_struct(task);
2122
2123out_notask:
2124 if (status <= 0)
2125 d_drop(dentry);
2126
2127 return status;
2128}
2129
2130static const struct dentry_operations tid_map_files_dentry_operations = {
2131 .d_revalidate = map_files_d_revalidate,
2132 .d_delete = pid_delete_dentry,
2133};
2134
2135static int proc_map_files_get_link(struct dentry *dentry, struct path *path)
2136{
2137 unsigned long vm_start, vm_end;
2138 struct vm_area_struct *vma;
2139 struct task_struct *task;
2140 struct mm_struct *mm;
2141 int rc;
2142
2143 rc = -ENOENT;
2144 task = get_proc_task(dentry->d_inode);
2145 if (!task)
2146 goto out;
2147
2148 mm = get_task_mm(task);
2149 put_task_struct(task);
2150 if (!mm)
2151 goto out;
2152
2153 rc = dname_to_vma_addr(dentry, &vm_start, &vm_end);
2154 if (rc)
2155 goto out_mmput;
2156
2157 down_read(&mm->mmap_sem);
2158 vma = find_exact_vma(mm, vm_start, vm_end);
2159 if (vma && vma->vm_file) {
2160 *path = vma->vm_file->f_path;
2161 path_get(path);
2162 rc = 0;
2163 }
2164 up_read(&mm->mmap_sem);
2165
2166out_mmput:
2167 mmput(mm);
2168out:
2169 return rc;
2170}
2171
2172struct map_files_info {
2173 struct file *file;
2174 unsigned long len;
2175 unsigned char name[4*sizeof(long)+2]; /* max: %lx-%lx\0 */
2176};
2177
2178static struct dentry *
2179proc_map_files_instantiate(struct inode *dir, struct dentry *dentry,
2180 struct task_struct *task, const void *ptr)
2181{
2182 const struct file *file = ptr;
2183 struct proc_inode *ei;
2184 struct inode *inode;
2185
2186 if (!file)
2187 return ERR_PTR(-ENOENT);
2188
2189 inode = proc_pid_make_inode(dir->i_sb, task);
2190 if (!inode)
2191 return ERR_PTR(-ENOENT);
2192
2193 ei = PROC_I(inode);
2194 ei->op.proc_get_link = proc_map_files_get_link;
2195
2196 inode->i_op = &proc_pid_link_inode_operations;
2197 inode->i_size = 64;
2198 inode->i_mode = S_IFLNK;
2199
2200 if (file->f_mode & FMODE_READ)
2201 inode->i_mode |= S_IRUSR;
2202 if (file->f_mode & FMODE_WRITE)
2203 inode->i_mode |= S_IWUSR;
2204
2205 d_set_d_op(dentry, &tid_map_files_dentry_operations);
2206 d_add(dentry, inode);
2207
2208 return NULL;
2209}
2210
2211static struct dentry *proc_map_files_lookup(struct inode *dir,
2212 struct dentry *dentry, struct nameidata *nd)
2213{
2214 unsigned long vm_start, vm_end;
2215 struct vm_area_struct *vma;
2216 struct task_struct *task;
2217 struct dentry *result;
2218 struct mm_struct *mm;
2219
2220 result = ERR_PTR(-EACCES);
2221 if (!capable(CAP_SYS_ADMIN))
2222 goto out;
2223
2224 result = ERR_PTR(-ENOENT);
2225 task = get_proc_task(dir);
2226 if (!task)
2227 goto out;
2228
2229 result = ERR_PTR(-EACCES);
2230 if (lock_trace(task))
2231 goto out_put_task;
2232
2233 result = ERR_PTR(-ENOENT);
2234 if (dname_to_vma_addr(dentry, &vm_start, &vm_end))
2235 goto out_unlock;
2236
2237 mm = get_task_mm(task);
2238 if (!mm)
2239 goto out_unlock;
2240
2241 down_read(&mm->mmap_sem);
2242 vma = find_exact_vma(mm, vm_start, vm_end);
2243 if (!vma)
2244 goto out_no_vma;
2245
2246 result = proc_map_files_instantiate(dir, dentry, task, vma->vm_file);
2247
2248out_no_vma:
2249 up_read(&mm->mmap_sem);
2250 mmput(mm);
2251out_unlock:
2252 unlock_trace(task);
2253out_put_task:
2254 put_task_struct(task);
2255out:
2256 return result;
2257}
2258
2259static const struct inode_operations proc_map_files_inode_operations = {
2260 .lookup = proc_map_files_lookup,
2261 .permission = proc_fd_permission,
2262 .setattr = proc_setattr,
2263};
2264
2265static int
2266proc_map_files_readdir(struct file *filp, void *dirent, filldir_t filldir)
2267{
2268 struct dentry *dentry = filp->f_path.dentry;
2269 struct inode *inode = dentry->d_inode;
2270 struct vm_area_struct *vma;
2271 struct task_struct *task;
2272 struct mm_struct *mm;
2273 ino_t ino;
2274 int ret;
2275
2276 ret = -EACCES;
2277 if (!capable(CAP_SYS_ADMIN))
2278 goto out;
2279
2280 ret = -ENOENT;
2281 task = get_proc_task(inode);
2282 if (!task)
2283 goto out;
2284
2285 ret = -EACCES;
2286 if (lock_trace(task))
2287 goto out_put_task;
2288
2289 ret = 0;
2290 switch (filp->f_pos) {
2291 case 0:
2292 ino = inode->i_ino;
2293 if (filldir(dirent, ".", 1, 0, ino, DT_DIR) < 0)
2294 goto out_unlock;
2295 filp->f_pos++;
2296 case 1:
2297 ino = parent_ino(dentry);
2298 if (filldir(dirent, "..", 2, 1, ino, DT_DIR) < 0)
2299 goto out_unlock;
2300 filp->f_pos++;
2301 default:
2302 {
2303 unsigned long nr_files, pos, i;
2304 struct flex_array *fa = NULL;
2305 struct map_files_info info;
2306 struct map_files_info *p;
2307
2308 mm = get_task_mm(task);
2309 if (!mm)
2310 goto out_unlock;
2311 down_read(&mm->mmap_sem);
2312
2313 nr_files = 0;
2314
2315 /*
2316 * We need two passes here:
2317 *
2318 * 1) Collect vmas of mapped files with mmap_sem taken
2319 * 2) Release mmap_sem and instantiate entries
2320 *
2321 * otherwise we get lockdep complained, since filldir()
2322 * routine might require mmap_sem taken in might_fault().
2323 */
2324
2325 for (vma = mm->mmap, pos = 2; vma; vma = vma->vm_next) {
2326 if (vma->vm_file && ++pos > filp->f_pos)
2327 nr_files++;
2328 }
2329
2330 if (nr_files) {
2331 fa = flex_array_alloc(sizeof(info), nr_files,
2332 GFP_KERNEL);
2333 if (!fa || flex_array_prealloc(fa, 0, nr_files,
2334 GFP_KERNEL)) {
2335 ret = -ENOMEM;
2336 if (fa)
2337 flex_array_free(fa);
2338 up_read(&mm->mmap_sem);
2339 mmput(mm);
2340 goto out_unlock;
2341 }
2342 for (i = 0, vma = mm->mmap, pos = 2; vma;
2343 vma = vma->vm_next) {
2344 if (!vma->vm_file)
2345 continue;
2346 if (++pos <= filp->f_pos)
2347 continue;
2348
2349 get_file(vma->vm_file);
2350 info.file = vma->vm_file;
2351 info.len = snprintf(info.name,
2352 sizeof(info.name), "%lx-%lx",
2353 vma->vm_start, vma->vm_end);
2354 if (flex_array_put(fa, i++, &info, GFP_KERNEL))
2355 BUG();
2356 }
2357 }
2358 up_read(&mm->mmap_sem);
2359
2360 for (i = 0; i < nr_files; i++) {
2361 p = flex_array_get(fa, i);
2362 ret = proc_fill_cache(filp, dirent, filldir,
2363 p->name, p->len,
2364 proc_map_files_instantiate,
2365 task, p->file);
2366 if (ret)
2367 break;
2368 filp->f_pos++;
2369 fput(p->file);
2370 }
2371 for (; i < nr_files; i++) {
2372 /*
2373 * In case of error don't forget
2374 * to put rest of file refs.
2375 */
2376 p = flex_array_get(fa, i);
2377 fput(p->file);
2378 }
2379 if (fa)
2380 flex_array_free(fa);
2381 mmput(mm);
2382 }
2383 }
2384
2385out_unlock:
2386 unlock_trace(task);
2387out_put_task:
2388 put_task_struct(task);
2389out:
2390 return ret;
2391}
2392
2393static const struct file_operations proc_map_files_operations = {
2394 .read = generic_read_dir,
2395 .readdir = proc_map_files_readdir,
2396 .llseek = default_llseek,
2397};
2398
2399#endif /* CONFIG_CHECKPOINT_RESTORE */
2400
8948e11f
AD		 2401/*
2402 * /proc/pid/fd needs a special permission handler so that a process can still
2403 * access /proc/self/fd after it has executed a setuid().
2404 */
10556cb2 2405static int proc_fd_permission(struct inode *inode, int mask)
8948e11f 2406{
2830ba7f 2407 int rv = generic_permission(inode, mask);
8948e11f
AD		 2408 if (rv == 0)
2409 return 0;
2410 if (task_pid(current) == proc_pid(inode))
2411 rv = 0;
2412 return rv;
2413}
2414
1da177e4
LT		 2415/*
2416 * proc directories can do almost nothing..
2417 */
c5ef1c42 2418static const struct inode_operations proc_fd_inode_operations = {
1da177e4 2419 .lookup = proc_lookupfd,
8948e11f 2420 .permission = proc_fd_permission,
6d76fa58 2421 .setattr = proc_setattr,
1da177e4
LT		 2422};
2423
27932742
MS		 2424static struct dentry *proc_fdinfo_instantiate(struct inode *dir,
2425 struct dentry *dentry, struct task_struct *task, const void *ptr)
2426{
2427 unsigned fd = *(unsigned *)ptr;
2428 struct inode *inode;
2429 struct proc_inode *ei;
2430 struct dentry *error = ERR_PTR(-ENOENT);
2431
2432 inode = proc_pid_make_inode(dir->i_sb, task);
2433 if (!inode)
2434 goto out;
2435 ei = PROC_I(inode);
2436 ei->fd = fd;
2437 inode->i_mode = S_IFREG | S_IRUSR;
2438 inode->i_fop = &proc_fdinfo_file_operations;
fb045adb 2439 d_set_d_op(dentry, &tid_fd_dentry_operations);
27932742
MS		 2440 d_add(dentry, inode);
2441 /* Close the race of the process dying before we return the dentry */
2442 if (tid_fd_revalidate(dentry, NULL))
2443 error = NULL;
2444
2445 out:
2446 return error;
2447}
2448
2449static struct dentry *proc_lookupfdinfo(struct inode *dir,
2450 struct dentry *dentry,
2451 struct nameidata *nd)
2452{
2453 return proc_lookupfd_common(dir, dentry, proc_fdinfo_instantiate);
2454}
2455
2456static int proc_readfdinfo(struct file *filp, void *dirent, filldir_t filldir)
2457{
2458 return proc_readfd_common(filp, dirent, filldir,
2459 proc_fdinfo_instantiate);
2460}
2461
2462static const struct file_operations proc_fdinfo_operations = {
2463 .read = generic_read_dir,
2464 .readdir = proc_readfdinfo,
6038f373 2465 .llseek = default_llseek,
27932742
MS		 2466};
2467
2468/*
2469 * proc directories can do almost nothing..
2470 */
2471static const struct inode_operations proc_fdinfo_inode_operations = {
2472 .lookup = proc_lookupfdinfo,
2473 .setattr = proc_setattr,
2474};
2475
2476
444ceed8 2477static struct dentry *proc_pident_instantiate(struct inode *dir,
c5141e6d 2478 struct dentry *dentry, struct task_struct *task, const void *ptr)
444ceed8 2479{
c5141e6d 2480 const struct pid_entry *p = ptr;
444ceed8
EB		 2481 struct inode *inode;
2482 struct proc_inode *ei;
bd6daba9 2483 struct dentry *error = ERR_PTR(-ENOENT);
444ceed8 2484
61a28784 2485 inode = proc_pid_make_inode(dir->i_sb, task);
444ceed8
EB		 2486 if (!inode)
2487 goto out;
2488
2489 ei = PROC_I(inode);
2490 inode->i_mode = p->mode;
2491 if (S_ISDIR(inode->i_mode))
bfe86848 2492 set_nlink(inode, 2); /* Use getattr to fix if necessary */
444ceed8
EB		 2493 if (p->iop)
2494 inode->i_op = p->iop;
2495 if (p->fop)
2496 inode->i_fop = p->fop;
2497 ei->op = p->op;
fb045adb 2498 d_set_d_op(dentry, &pid_dentry_operations);
444ceed8
EB		 2499 d_add(dentry, inode);
2500 /* Close the race of the process dying before we return the dentry */
2501 if (pid_revalidate(dentry, NULL))
2502 error = NULL;
2503out:
2504 return error;
2505}
2506
1da177e4
LT		 2507static struct dentry *proc_pident_lookup(struct inode *dir,
2508 struct dentry *dentry,
c5141e6d 2509 const struct pid_entry *ents,
7bcd6b0e 2510 unsigned int nents)
1da177e4 2511{
cd6a3ce9 2512 struct dentry *error;
99f89551 2513 struct task_struct *task = get_proc_task(dir);
c5141e6d 2514 const struct pid_entry *p, *last;
1da177e4 2515
cd6a3ce9 2516 error = ERR_PTR(-ENOENT);
1da177e4 2517
99f89551
EB		 2518 if (!task)
2519 goto out_no_task;
1da177e4 2520
20cdc894
EB		 2521 /*
2522 * Yes, it does not scale. And it should not. Don't add
2523 * new entries into /proc/<tgid>/ without very good reasons.
2524 */
7bcd6b0e
EB		 2525 last = &ents[nents - 1];
2526 for (p = ents; p <= last; p++) {
1da177e4
LT		 2527 if (p->len != dentry->d_name.len)
2528 continue;
2529 if (!memcmp(dentry->d_name.name, p->name, p->len))
2530 break;
2531 }
7bcd6b0e 2532 if (p > last)
1da177e4
LT		 2533 goto out;
2534
444ceed8 2535 error = proc_pident_instantiate(dir, dentry, task, p);
1da177e4 2536out:
99f89551
EB		 2537 put_task_struct(task);
2538out_no_task:
cd6a3ce9 2539 return error;
1da177e4
LT		 2540}
2541
c5141e6d
ED		 2542static int proc_pident_fill_cache(struct file *filp, void *dirent,
2543 filldir_t filldir, struct task_struct *task, const struct pid_entry *p)
61a28784
EB		 2544{
2545 return proc_fill_cache(filp, dirent, filldir, p->name, p->len,
2546 proc_pident_instantiate, task, p);
2547}
2548
28a6d671
EB		 2549static int proc_pident_readdir(struct file *filp,
2550 void *dirent, filldir_t filldir,
c5141e6d 2551 const struct pid_entry *ents, unsigned int nents)
28a6d671
EB		 2552{
2553 int i;
2fddfeef 2554 struct dentry *dentry = filp->f_path.dentry;
28a6d671
EB		 2555 struct inode *inode = dentry->d_inode;
2556 struct task_struct *task = get_proc_task(inode);
c5141e6d 2557 const struct pid_entry *p, *last;
28a6d671
EB		 2558 ino_t ino;
2559 int ret;
2560
2561 ret = -ENOENT;
2562 if (!task)
61a28784 2563 goto out_no_task;
28a6d671
EB		 2564
2565 ret = 0;
28a6d671
EB		 2566 i = filp->f_pos;
2567 switch (i) {
2568 case 0:
2569 ino = inode->i_ino;
2570 if (filldir(dirent, ".", 1, i, ino, DT_DIR) < 0)
2571 goto out;
2572 i++;
2573 filp->f_pos++;
2574 /* fall through */
2575 case 1:
2576 ino = parent_ino(dentry);
2577 if (filldir(dirent, "..", 2, i, ino, DT_DIR) < 0)
2578 goto out;
2579 i++;
2580 filp->f_pos++;
2581 /* fall through */
2582 default:
2583 i -= 2;
2584 if (i >= nents) {
2585 ret = 1;
2586 goto out;
2587 }
2588 p = ents + i;
7bcd6b0e
EB		 2589 last = &ents[nents - 1];
2590 while (p <= last) {
61a28784 2591 if (proc_pident_fill_cache(filp, dirent, filldir, task, p) < 0)
28a6d671
EB		 2592 goto out;
2593 filp->f_pos++;
2594 p++;
2595 }
2596 }
2597
2598 ret = 1;
2599out:
61a28784
EB		 2600 put_task_struct(task);
2601out_no_task:
28a6d671 2602 return ret;
1da177e4
LT		 2603}
2604
28a6d671
EB		 2605#ifdef CONFIG_SECURITY
2606static ssize_t proc_pid_attr_read(struct file * file, char __user * buf,
2607 size_t count, loff_t *ppos)
2608{
2fddfeef 2609 struct inode * inode = file->f_path.dentry->d_inode;
04ff9708 2610 char *p = NULL;
28a6d671
EB		 2611 ssize_t length;
2612 struct task_struct *task = get_proc_task(inode);
2613
28a6d671 2614 if (!task)
04ff9708 2615 return -ESRCH;
28a6d671
EB		 2616
2617 length = security_getprocattr(task,
2fddfeef 2618 (char*)file->f_path.dentry->d_name.name,
04ff9708 2619 &p);
28a6d671 2620 put_task_struct(task);
04ff9708
AV		 2621 if (length > 0)
2622 length = simple_read_from_buffer(buf, count, ppos, p, length);
2623 kfree(p);
28a6d671 2624 return length;
1da177e4
LT		 2625}
2626
28a6d671
EB		 2627static ssize_t proc_pid_attr_write(struct file * file, const char __user * buf,
2628 size_t count, loff_t *ppos)
2629{
2fddfeef 2630 struct inode * inode = file->f_path.dentry->d_inode;
28a6d671
EB		 2631 char *page;
2632 ssize_t length;
2633 struct task_struct *task = get_proc_task(inode);
2634
2635 length = -ESRCH;
2636 if (!task)
2637 goto out_no_task;
2638 if (count > PAGE_SIZE)
2639 count = PAGE_SIZE;
2640
2641 /* No partial writes. */
2642 length = -EINVAL;
2643 if (*ppos != 0)
2644 goto out;
2645
2646 length = -ENOMEM;
e12ba74d 2647 page = (char*)__get_free_page(GFP_TEMPORARY);
28a6d671
EB		 2648 if (!page)
2649 goto out;
2650
2651 length = -EFAULT;
2652 if (copy_from_user(page, buf, count))
2653 goto out_free;
2654
107db7c7 2655 /* Guard against adverse ptrace interaction */
9b1bf12d 2656 length = mutex_lock_interruptible(&task->signal->cred_guard_mutex);
107db7c7
DH		 2657 if (length < 0)
2658 goto out_free;
2659
28a6d671 2660 length = security_setprocattr(task,
2fddfeef 2661 (char*)file->f_path.dentry->d_name.name,
28a6d671 2662 (void*)page, count);
9b1bf12d 2663 mutex_unlock(&task->signal->cred_guard_mutex);
28a6d671
EB		 2664out_free:
2665 free_page((unsigned long) page);
2666out:
2667 put_task_struct(task);
2668out_no_task:
2669 return length;
2670}
2671
00977a59 2672static const struct file_operations proc_pid_attr_operations = {
28a6d671
EB		 2673 .read = proc_pid_attr_read,
2674 .write = proc_pid_attr_write,
87df8424 2675 .llseek = generic_file_llseek,
28a6d671
EB		 2676};
2677
c5141e6d 2678static const struct pid_entry attr_dir_stuff[] = {
631f9c18
AD		 2679 REG("current", S_IRUGO|S_IWUGO, proc_pid_attr_operations),
2680 REG("prev", S_IRUGO, proc_pid_attr_operations),
2681 REG("exec", S_IRUGO|S_IWUGO, proc_pid_attr_operations),
2682 REG("fscreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations),
2683 REG("keycreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations),
2684 REG("sockcreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations),
28a6d671
EB		 2685};
2686
72d9dcfc 2687static int proc_attr_dir_readdir(struct file * filp,
28a6d671
EB		 2688 void * dirent, filldir_t filldir)
2689{
2690 return proc_pident_readdir(filp,dirent,filldir,
72d9dcfc 2691 attr_dir_stuff,ARRAY_SIZE(attr_dir_stuff));
28a6d671
EB		 2692}
2693
00977a59 2694static const struct file_operations proc_attr_dir_operations = {
1da177e4 2695 .read = generic_read_dir,
72d9dcfc 2696 .readdir = proc_attr_dir_readdir,
6038f373 2697 .llseek = default_llseek,
1da177e4
LT		 2698};
2699
72d9dcfc 2700static struct dentry *proc_attr_dir_lookup(struct inode *dir,
28a6d671
EB		 2701 struct dentry *dentry, struct nameidata *nd)
2702{
7bcd6b0e
EB		 2703 return proc_pident_lookup(dir, dentry,
2704 attr_dir_stuff, ARRAY_SIZE(attr_dir_stuff));
28a6d671
EB		 2705}
2706
c5ef1c42 2707static const struct inode_operations proc_attr_dir_inode_operations = {
72d9dcfc 2708 .lookup = proc_attr_dir_lookup,
99f89551 2709 .getattr = pid_getattr,
6d76fa58 2710 .setattr = proc_setattr,
1da177e4
LT		 2711};
2712
28a6d671
EB		 2713#endif
2714
698ba7b5 2715#ifdef CONFIG_ELF_CORE
3cb4a0bb
KH		 2716static ssize_t proc_coredump_filter_read(struct file *file, char __user *buf,
2717 size_t count, loff_t *ppos)
2718{
2719 struct task_struct *task = get_proc_task(file->f_dentry->d_inode);
2720 struct mm_struct *mm;
2721 char buffer[PROC_NUMBUF];
2722 size_t len;
2723 int ret;
2724
2725 if (!task)
2726 return -ESRCH;
2727
2728 ret = 0;
2729 mm = get_task_mm(task);
2730 if (mm) {
2731 len = snprintf(buffer, sizeof(buffer), "%08lx\n",
2732 ((mm->flags & MMF_DUMP_FILTER_MASK) >>
2733 MMF_DUMP_FILTER_SHIFT));
2734 mmput(mm);
2735 ret = simple_read_from_buffer(buf, count, ppos, buffer, len);
2736 }
2737
2738 put_task_struct(task);
2739
2740 return ret;
2741}
2742
2743static ssize_t proc_coredump_filter_write(struct file *file,
2744 const char __user *buf,
2745 size_t count,
2746 loff_t *ppos)
2747{
2748 struct task_struct *task;
2749 struct mm_struct *mm;
2750 char buffer[PROC_NUMBUF], *end;
2751 unsigned int val;
2752 int ret;
2753 int i;
2754 unsigned long mask;
2755
2756 ret = -EFAULT;
2757 memset(buffer, 0, sizeof(buffer));
2758 if (count > sizeof(buffer) - 1)
2759 count = sizeof(buffer) - 1;
2760 if (copy_from_user(buffer, buf, count))
2761 goto out_no_task;
2762
2763 ret = -EINVAL;
2764 val = (unsigned int)simple_strtoul(buffer, &end, 0);
2765 if (*end == '\n')
2766 end++;
2767 if (end - buffer == 0)
2768 goto out_no_task;
2769
2770 ret = -ESRCH;
2771 task = get_proc_task(file->f_dentry->d_inode);
2772 if (!task)
2773 goto out_no_task;
2774
2775 ret = end - buffer;
2776 mm = get_task_mm(task);
2777 if (!mm)
2778 goto out_no_mm;
2779
2780 for (i = 0, mask = 1; i < MMF_DUMP_FILTER_BITS; i++, mask <<= 1) {
2781 if (val & mask)
2782 set_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags);
2783 else
2784 clear_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags);
2785 }
2786
2787 mmput(mm);
2788 out_no_mm:
2789 put_task_struct(task);
2790 out_no_task:
2791 return ret;
2792}
2793
2794static const struct file_operations proc_coredump_filter_operations = {
2795 .read = proc_coredump_filter_read,
2796 .write = proc_coredump_filter_write,
87df8424 2797 .llseek = generic_file_llseek,
3cb4a0bb
KH		 2798};
2799#endif
2800
28a6d671
EB		 2801/*
2802 * /proc/self:
2803 */
2804static int proc_self_readlink(struct dentry *dentry, char __user *buffer,
2805 int buflen)
2806{
488e5bc4 2807 struct pid_namespace *ns = dentry->d_sb->s_fs_info;
b55fcb22 2808 pid_t tgid = task_tgid_nr_ns(current, ns);
28a6d671 2809 char tmp[PROC_NUMBUF];
b55fcb22 2810 if (!tgid)
488e5bc4 2811 return -ENOENT;
b55fcb22 2812 sprintf(tmp, "%d", tgid);
28a6d671
EB		 2813 return vfs_readlink(dentry,buffer,buflen,tmp);
2814}
2815
2816static void *proc_self_follow_link(struct dentry *dentry, struct nameidata *nd)
2817{
488e5bc4 2818 struct pid_namespace *ns = dentry->d_sb->s_fs_info;
b55fcb22 2819 pid_t tgid = task_tgid_nr_ns(current, ns);
7fee4868
AV		 2820 char *name = ERR_PTR(-ENOENT);
2821 if (tgid) {
2822 name = __getname();
2823 if (!name)
2824 name = ERR_PTR(-ENOMEM);
2825 else
2826 sprintf(name, "%d", tgid);
2827 }
2828 nd_set_link(nd, name);
2829 return NULL;
2830}
2831
2832static void proc_self_put_link(struct dentry *dentry, struct nameidata *nd,
2833 void *cookie)
2834{
2835 char *s = nd_get_link(nd);
2836 if (!IS_ERR(s))
2837 __putname(s);
28a6d671
EB		 2838}
2839
c5ef1c42 2840static const struct inode_operations proc_self_inode_operations = {
28a6d671
EB		 2841 .readlink = proc_self_readlink,
2842 .follow_link = proc_self_follow_link,
7fee4868 2843 .put_link = proc_self_put_link,
28a6d671
EB		 2844};
2845
801199ce
EB		 2846/*
2847 * proc base
2848 *
2849 * These are the directory entries in the root directory of /proc
2850 * that properly belong to the /proc filesystem, as they describe
2851 * describe something that is process related.
2852 */
c5141e6d 2853static const struct pid_entry proc_base_stuff[] = {
61a28784 2854 NOD("self", S_IFLNK|S_IRWXUGO,
801199ce 2855 &proc_self_inode_operations, NULL, {}),
801199ce
EB		 2856};
2857
444ceed8 2858static struct dentry *proc_base_instantiate(struct inode *dir,
c5141e6d 2859 struct dentry *dentry, struct task_struct *task, const void *ptr)
801199ce 2860{
c5141e6d 2861 const struct pid_entry *p = ptr;
801199ce 2862 struct inode *inode;
801199ce 2863 struct proc_inode *ei;
73d36460 2864 struct dentry *error;
801199ce
EB		 2865
2866 /* Allocate the inode */
2867 error = ERR_PTR(-ENOMEM);
2868 inode = new_inode(dir->i_sb);
2869 if (!inode)
2870 goto out;
2871
2872 /* Initialize the inode */
2873 ei = PROC_I(inode);
85fe4025 2874 inode->i_ino = get_next_ino();
801199ce 2875 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
801199ce
EB		 2876
2877 /*
2878 * grab the reference to the task.
2879 */
1a657f78 2880 ei->pid = get_task_pid(task, PIDTYPE_PID);
801199ce
EB		 2881 if (!ei->pid)
2882 goto out_iput;
2883
801199ce
EB		 2884 inode->i_mode = p->mode;
2885 if (S_ISDIR(inode->i_mode))
bfe86848 2886 set_nlink(inode, 2);
801199ce
EB		 2887 if (S_ISLNK(inode->i_mode))
2888 inode->i_size = 64;
2889 if (p->iop)
2890 inode->i_op = p->iop;
2891 if (p->fop)
2892 inode->i_fop = p->fop;
2893 ei->op = p->op;
801199ce
EB		 2894 d_add(dentry, inode);
2895 error = NULL;
2896out:
801199ce
EB		 2897 return error;
2898out_iput:
2899 iput(inode);
2900 goto out;
2901}
2902
444ceed8
EB		 2903static struct dentry *proc_base_lookup(struct inode *dir, struct dentry *dentry)
2904{
2905 struct dentry *error;
2906 struct task_struct *task = get_proc_task(dir);
c5141e6d 2907 const struct pid_entry *p, *last;
444ceed8
EB		 2908
2909 error = ERR_PTR(-ENOENT);
2910
2911 if (!task)
2912 goto out_no_task;
2913
2914 /* Lookup the directory entry */
7bcd6b0e
EB		 2915 last = &proc_base_stuff[ARRAY_SIZE(proc_base_stuff) - 1];
2916 for (p = proc_base_stuff; p <= last; p++) {
444ceed8
EB		 2917 if (p->len != dentry->d_name.len)
2918 continue;
2919 if (!memcmp(dentry->d_name.name, p->name, p->len))
2920 break;
2921 }
7bcd6b0e 2922 if (p > last)
444ceed8
EB		 2923 goto out;
2924
2925 error = proc_base_instantiate(dir, dentry, task, p);
2926
2927out:
2928 put_task_struct(task);
2929out_no_task:
2930 return error;
2931}
2932
c5141e6d
ED		 2933static int proc_base_fill_cache(struct file *filp, void *dirent,
2934 filldir_t filldir, struct task_struct *task, const struct pid_entry *p)
61a28784
EB		 2935{
2936 return proc_fill_cache(filp, dirent, filldir, p->name, p->len,
2937 proc_base_instantiate, task, p);
2938}
2939
aba76fdb 2940#ifdef CONFIG_TASK_IO_ACCOUNTING
297c5d92
AR		 2941static int do_io_accounting(struct task_struct *task, char *buffer, int whole)
2942{
940389b8 2943 struct task_io_accounting acct = task->ioac;
5995477a 2944 unsigned long flags;
293eb1e7 2945 int result;
5995477a 2946
293eb1e7
VK		 2947 result = mutex_lock_killable(&task->signal->cred_guard_mutex);
2948 if (result)
2949 return result;
2950
2951 if (!ptrace_may_access(task, PTRACE_MODE_READ)) {
2952 result = -EACCES;
2953 goto out_unlock;
2954 }
1d1221f3 2955
5995477a
AR		 2956 if (whole && lock_task_sighand(task, &flags)) {
2957 struct task_struct *t = task;
2958
2959 task_io_accounting_add(&acct, &task->signal->ioac);
2960 while_each_thread(task, t)
2961 task_io_accounting_add(&acct, &t->ioac);
2962
2963 unlock_task_sighand(task, &flags);
297c5d92 2964 }
293eb1e7 2965 result = sprintf(buffer,
aba76fdb
AM		 2966 "rchar: %llu\n"
2967 "wchar: %llu\n"
2968 "syscr: %llu\n"
2969 "syscw: %llu\n"
2970 "read_bytes: %llu\n"
2971 "write_bytes: %llu\n"
2972 "cancelled_write_bytes: %llu\n",
7c44319d
AB		 2973 (unsigned long long)acct.rchar,
2974 (unsigned long long)acct.wchar,
2975 (unsigned long long)acct.syscr,
2976 (unsigned long long)acct.syscw,
2977 (unsigned long long)acct.read_bytes,
2978 (unsigned long long)acct.write_bytes,
2979 (unsigned long long)acct.cancelled_write_bytes);
293eb1e7
VK		 2980out_unlock:
2981 mutex_unlock(&task->signal->cred_guard_mutex);
2982 return result;
297c5d92
AR		 2983}
2984
2985static int proc_tid_io_accounting(struct task_struct *task, char *buffer)
2986{
2987 return do_io_accounting(task, buffer, 0);
aba76fdb 2988}
297c5d92
AR		 2989
2990static int proc_tgid_io_accounting(struct task_struct *task, char *buffer)
2991{
2992 return do_io_accounting(task, buffer, 1);
2993}
2994#endif /* CONFIG_TASK_IO_ACCOUNTING */
aba76fdb 2995
47830723
KC		 2996static int proc_pid_personality(struct seq_file *m, struct pid_namespace *ns,
2997 struct pid *pid, struct task_struct *task)
2998{
a9712bc1
AV		 2999 int err = lock_trace(task);
3000 if (!err) {
3001 seq_printf(m, "%08x\n", task->personality);
3002 unlock_trace(task);
3003 }
3004 return err;
47830723
KC		 3005}
3006
28a6d671
EB		 3007/*
3008 * Thread groups
3009 */
00977a59 3010static const struct file_operations proc_task_operations;
c5ef1c42 3011static const struct inode_operations proc_task_inode_operations;
20cdc894 3012
c5141e6d 3013static const struct pid_entry tgid_base_stuff[] = {
631f9c18
AD		 3014 DIR("task", S_IRUGO|S_IXUGO, proc_task_inode_operations, proc_task_operations),
3015 DIR("fd", S_IRUSR|S_IXUSR, proc_fd_inode_operations, proc_fd_operations),
640708a2
PE		 3016#ifdef CONFIG_CHECKPOINT_RESTORE
3017 DIR("map_files", S_IRUSR|S_IXUSR, proc_map_files_inode_operations, proc_map_files_operations),
3018#endif
631f9c18 3019 DIR("fdinfo", S_IRUSR|S_IXUSR, proc_fdinfo_inode_operations, proc_fdinfo_operations),
6b4e306a 3020 DIR("ns", S_IRUSR|S_IXUGO, proc_ns_dir_inode_operations, proc_ns_dir_operations),
b2211a36 3021#ifdef CONFIG_NET
631f9c18 3022 DIR("net", S_IRUGO|S_IXUGO, proc_net_inode_operations, proc_net_operations),
b2211a36 3023#endif
631f9c18
AD		 3024 REG("environ", S_IRUSR, proc_environ_operations),
3025 INF("auxv", S_IRUSR, proc_pid_auxv),
3026 ONE("status", S_IRUGO, proc_pid_status),
a9712bc1 3027 ONE("personality", S_IRUGO, proc_pid_personality),
3036e7b4 3028 INF("limits", S_IRUGO, proc_pid_limits),
43ae34cb 3029#ifdef CONFIG_SCHED_DEBUG
631f9c18 3030 REG("sched", S_IRUGO|S_IWUSR, proc_pid_sched_operations),
5091faa4
MG		 3031#endif
3032#ifdef CONFIG_SCHED_AUTOGROUP
3033 REG("autogroup", S_IRUGO|S_IWUSR, proc_pid_sched_autogroup_operations),
ebcb6734 3034#endif
4614a696 3035 REG("comm", S_IRUGO|S_IWUSR, proc_pid_set_comm_operations),
ebcb6734 3036#ifdef CONFIG_HAVE_ARCH_TRACEHOOK
a9712bc1 3037 INF("syscall", S_IRUGO, proc_pid_syscall),
43ae34cb 3038#endif
631f9c18
AD		 3039 INF("cmdline", S_IRUGO, proc_pid_cmdline),
3040 ONE("stat", S_IRUGO, proc_tgid_stat),
3041 ONE("statm", S_IRUGO, proc_pid_statm),
3042 REG("maps", S_IRUGO, proc_maps_operations),
28a6d671 3043#ifdef CONFIG_NUMA
631f9c18 3044 REG("numa_maps", S_IRUGO, proc_numa_maps_operations),
28a6d671 3045#endif
631f9c18
AD		 3046 REG("mem", S_IRUSR|S_IWUSR, proc_mem_operations),
3047 LNK("cwd", proc_cwd_link),
3048 LNK("root", proc_root_link),
3049 LNK("exe", proc_exe_link),
3050 REG("mounts", S_IRUGO, proc_mounts_operations),
3051 REG("mountinfo", S_IRUGO, proc_mountinfo_operations),
3052 REG("mountstats", S_IRUSR, proc_mountstats_operations),
1e883281 3053#ifdef CONFIG_PROC_PAGE_MONITOR
631f9c18
AD		 3054 REG("clear_refs", S_IWUSR, proc_clear_refs_operations),
3055 REG("smaps", S_IRUGO, proc_smaps_operations),
ca6b0bf0 3056 REG("pagemap", S_IRUGO, proc_pagemap_operations),
28a6d671
EB		 3057#endif
3058#ifdef CONFIG_SECURITY
631f9c18 3059 DIR("attr", S_IRUGO|S_IXUGO, proc_attr_dir_inode_operations, proc_attr_dir_operations),
28a6d671
EB		 3060#endif
3061#ifdef CONFIG_KALLSYMS
631f9c18 3062 INF("wchan", S_IRUGO, proc_pid_wchan),
28a6d671 3063#endif
2ec220e2 3064#ifdef CONFIG_STACKTRACE
a9712bc1 3065 ONE("stack", S_IRUGO, proc_pid_stack),
28a6d671
EB		 3066#endif
3067#ifdef CONFIG_SCHEDSTATS
631f9c18 3068 INF("schedstat", S_IRUGO, proc_pid_schedstat),
28a6d671 3069#endif
9745512c 3070#ifdef CONFIG_LATENCYTOP
631f9c18 3071 REG("latency", S_IRUGO, proc_lstats_operations),
9745512c 3072#endif
8793d854 3073#ifdef CONFIG_PROC_PID_CPUSET
631f9c18 3074 REG("cpuset", S_IRUGO, proc_cpuset_operations),
a424316c
PM		 3075#endif
3076#ifdef CONFIG_CGROUPS
631f9c18 3077 REG("cgroup", S_IRUGO, proc_cgroup_operations),
28a6d671 3078#endif
631f9c18
AD		 3079 INF("oom_score", S_IRUGO, proc_oom_score),
3080 REG("oom_adj", S_IRUGO|S_IWUSR, proc_oom_adjust_operations),
a63d83f4 3081 REG("oom_score_adj", S_IRUGO|S_IWUSR, proc_oom_score_adj_operations),
28a6d671 3082#ifdef CONFIG_AUDITSYSCALL
631f9c18
AD		 3083 REG("loginuid", S_IWUSR|S_IRUGO, proc_loginuid_operations),
3084 REG("sessionid", S_IRUGO, proc_sessionid_operations),
28a6d671 3085#endif
f4f154fd 3086#ifdef CONFIG_FAULT_INJECTION
631f9c18 3087 REG("make-it-fail", S_IRUGO|S_IWUSR, proc_fault_inject_operations),
f4f154fd 3088#endif
698ba7b5 3089#ifdef CONFIG_ELF_CORE
631f9c18 3090 REG("coredump_filter", S_IRUGO|S_IWUSR, proc_coredump_filter_operations),
3cb4a0bb 3091#endif
aba76fdb 3092#ifdef CONFIG_TASK_IO_ACCOUNTING
1d1221f3 3093 INF("io", S_IRUSR, proc_tgid_io_accounting),
aba76fdb 3094#endif
f133ecca
CM		 3095#ifdef CONFIG_HARDWALL
3096 INF("hardwall", S_IRUGO, proc_pid_hardwall),
3097#endif
28a6d671 3098};
1da177e4 3099
28a6d671 3100static int proc_tgid_base_readdir(struct file * filp,
1da177e4
LT		 3101 void * dirent, filldir_t filldir)
3102{
3103 return proc_pident_readdir(filp,dirent,filldir,
28a6d671 3104 tgid_base_stuff,ARRAY_SIZE(tgid_base_stuff));
1da177e4
LT		 3105}
3106
00977a59 3107static const struct file_operations proc_tgid_base_operations = {
1da177e4 3108 .read = generic_read_dir,
28a6d671 3109 .readdir = proc_tgid_base_readdir,
6038f373 3110 .llseek = default_llseek,
1da177e4
LT		 3111};
3112
28a6d671 3113static struct dentry *proc_tgid_base_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd){
7bcd6b0e
EB		 3114 return proc_pident_lookup(dir, dentry,
3115 tgid_base_stuff, ARRAY_SIZE(tgid_base_stuff));
1da177e4
LT		 3116}
3117
c5ef1c42 3118static const struct inode_operations proc_tgid_base_inode_operations = {
28a6d671 3119 .lookup = proc_tgid_base_lookup,
99f89551 3120 .getattr = pid_getattr,
6d76fa58 3121 .setattr = proc_setattr,
1da177e4 3122};
1da177e4 3123
60347f67 3124static void proc_flush_task_mnt(struct vfsmount *mnt, pid_t pid, pid_t tgid)
1da177e4 3125{
48e6484d 3126 struct dentry *dentry, *leader, *dir;
8578cea7 3127 char buf[PROC_NUMBUF];
48e6484d
EB		 3128 struct qstr name;
3129
3130 name.name = buf;
60347f67
PE		 3131 name.len = snprintf(buf, sizeof(buf), "%d", pid);
3132 dentry = d_hash_and_lookup(mnt->mnt_root, &name);
48e6484d 3133 if (dentry) {
29f12ca3 3134 shrink_dcache_parent(dentry);
48e6484d
EB		 3135 d_drop(dentry);
3136 dput(dentry);
3137 }
1da177e4 3138
48e6484d 3139 name.name = buf;
60347f67
PE		 3140 name.len = snprintf(buf, sizeof(buf), "%d", tgid);
3141 leader = d_hash_and_lookup(mnt->mnt_root, &name);
48e6484d
EB		 3142 if (!leader)
3143 goto out;
1da177e4 3144
48e6484d
EB		 3145 name.name = "task";
3146 name.len = strlen(name.name);
3147 dir = d_hash_and_lookup(leader, &name);
3148 if (!dir)
3149 goto out_put_leader;
3150
3151 name.name = buf;
60347f67 3152 name.len = snprintf(buf, sizeof(buf), "%d", pid);
48e6484d
EB		 3153 dentry = d_hash_and_lookup(dir, &name);
3154 if (dentry) {
3155 shrink_dcache_parent(dentry);
3156 d_drop(dentry);
3157 dput(dentry);
1da177e4 3158 }
48e6484d
EB		 3159
3160 dput(dir);
3161out_put_leader:
3162 dput(leader);
3163out:
3164 return;
1da177e4
LT		 3165}
3166
0895e91d
RD		 3167/**
3168 * proc_flush_task - Remove dcache entries for @task from the /proc dcache.
3169 * @task: task that should be flushed.
3170 *
3171 * When flushing dentries from proc, one needs to flush them from global
60347f67 3172 * proc (proc_mnt) and from all the namespaces' procs this task was seen
0895e91d
RD		 3173 * in. This call is supposed to do all of this job.
3174 *
3175 * Looks in the dcache for
3176 * /proc/@pid
3177 * /proc/@tgid/task/@pid
3178 * if either directory is present flushes it and all of it'ts children
3179 * from the dcache.
3180 *
3181 * It is safe and reasonable to cache /proc entries for a task until
3182 * that task exits. After that they just clog up the dcache with
3183 * useless entries, possibly causing useful dcache entries to be
3184 * flushed instead. This routine is proved to flush those useless
3185 * dcache entries at process exit time.
3186 *
3187 * NOTE: This routine is just an optimization so it does not guarantee
3188 * that no dcache entries will exist at process exit time it
3189 * just makes it very unlikely that any will persist.
60347f67
PE		 3190 */
3191
3192void proc_flush_task(struct task_struct *task)
3193{
9fcc2d15 3194 int i;
9b4d1cbe 3195 struct pid *pid, *tgid;
130f77ec
PE		 3196 struct upid *upid;
3197
130f77ec 3198 pid = task_pid(task);
9b4d1cbe 3199 tgid = task_tgid(task);
130f77ec 3200
9fcc2d15 3201 for (i = 0; i <= pid->level; i++) {
130f77ec
PE		 3202 upid = &pid->numbers[i];
3203 proc_flush_task_mnt(upid->ns->proc_mnt, upid->nr,
9b4d1cbe 3204 tgid->numbers[i].nr);
130f77ec 3205 }
6f4e6433
PE		 3206
3207 upid = &pid->numbers[pid->level];
3208 if (upid->nr == 1)
3209 pid_ns_release_proc(upid->ns);
60347f67
PE		 3210}
3211
9711ef99
AB		 3212static struct dentry *proc_pid_instantiate(struct inode *dir,
3213 struct dentry * dentry,
c5141e6d 3214 struct task_struct *task, const void *ptr)
444ceed8
EB		 3215{
3216 struct dentry *error = ERR_PTR(-ENOENT);
3217 struct inode *inode;
3218
61a28784 3219 inode = proc_pid_make_inode(dir->i_sb, task);
444ceed8
EB		 3220 if (!inode)
3221 goto out;
3222
3223 inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO;
3224 inode->i_op = &proc_tgid_base_inode_operations;
3225 inode->i_fop = &proc_tgid_base_operations;
3226 inode->i_flags|=S_IMMUTABLE;
aed54175 3227
bfe86848
MS		 3228 set_nlink(inode, 2 + pid_entry_count_dirs(tgid_base_stuff,
3229 ARRAY_SIZE(tgid_base_stuff)));
444ceed8 3230
fb045adb 3231 d_set_d_op(dentry, &pid_dentry_operations);
444ceed8
EB		 3232
3233 d_add(dentry, inode);
3234 /* Close the race of the process dying before we return the dentry */
3235 if (pid_revalidate(dentry, NULL))
3236 error = NULL;
3237out:
3238 return error;
3239}
3240
1da177e4
LT		 3241struct dentry *proc_pid_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd)
3242{
73d36460 3243 struct dentry *result;
1da177e4 3244 struct task_struct *task;
1da177e4 3245 unsigned tgid;
b488893a 3246 struct pid_namespace *ns;
1da177e4 3247
801199ce
EB		 3248 result = proc_base_lookup(dir, dentry);
3249 if (!IS_ERR(result) || PTR_ERR(result) != -ENOENT)
3250 goto out;
3251
1da177e4
LT		 3252 tgid = name_to_int(dentry);
3253 if (tgid == ~0U)
3254 goto out;
3255
b488893a 3256 ns = dentry->d_sb->s_fs_info;
de758734 3257 rcu_read_lock();
b488893a 3258 task = find_task_by_pid_ns(tgid, ns);
1da177e4
LT		 3259 if (task)
3260 get_task_struct(task);
de758734 3261 rcu_read_unlock();
1da177e4
LT		 3262 if (!task)
3263 goto out;
3264
444ceed8 3265 result = proc_pid_instantiate(dir, dentry, task, NULL);
1da177e4 3266 put_task_struct(task);
1da177e4 3267out:
cd6a3ce9 3268 return result;
1da177e4
LT		 3269}
3270
1da177e4 3271/*
0804ef4b 3272 * Find the first task with tgid >= tgid
0bc58a91 3273 *
1da177e4 3274 */
19fd4bb2
EB		 3275struct tgid_iter {
3276 unsigned int tgid;
0804ef4b 3277 struct task_struct *task;
19fd4bb2
EB		 3278};
3279static struct tgid_iter next_tgid(struct pid_namespace *ns, struct tgid_iter iter)
3280{
0804ef4b 3281 struct pid *pid;
1da177e4 3282
19fd4bb2
EB		 3283 if (iter.task)
3284 put_task_struct(iter.task);
454cc105 3285 rcu_read_lock();
0804ef4b 3286retry:
19fd4bb2
EB		 3287 iter.task = NULL;
3288 pid = find_ge_pid(iter.tgid, ns);
0804ef4b 3289 if (pid) {
19fd4bb2
EB		 3290 iter.tgid = pid_nr_ns(pid, ns);
3291 iter.task = pid_task(pid, PIDTYPE_PID);
0804ef4b
EB		 3292 /* What we to know is if the pid we have find is the
3293 * pid of a thread_group_leader. Testing for task
3294 * being a thread_group_leader is the obvious thing
3295 * todo but there is a window when it fails, due to
3296 * the pid transfer logic in de_thread.
3297 *
3298 * So we perform the straight forward test of seeing
3299 * if the pid we have found is the pid of a thread
3300 * group leader, and don't worry if the task we have
3301 * found doesn't happen to be a thread group leader.
3302 * As we don't care in the case of readdir.
3303 */
19fd4bb2
EB		 3304 if (!iter.task || !has_group_leader_pid(iter.task)) {
3305 iter.tgid += 1;
0804ef4b 3306 goto retry;
19fd4bb2
EB		 3307 }
3308 get_task_struct(iter.task);
0bc58a91 3309 }
454cc105 3310 rcu_read_unlock();
19fd4bb2 3311 return iter;
1da177e4
LT		 3312}
3313
7bcd6b0e 3314#define TGID_OFFSET (FIRST_PROCESS_ENTRY + ARRAY_SIZE(proc_base_stuff))
0804ef4b 3315
61a28784 3316static int proc_pid_fill_cache(struct file *filp, void *dirent, filldir_t filldir,
19fd4bb2 3317 struct tgid_iter iter)
61a28784
EB		 3318{
3319 char name[PROC_NUMBUF];
19fd4bb2 3320 int len = snprintf(name, sizeof(name), "%d", iter.tgid);
61a28784 3321 return proc_fill_cache(filp, dirent, filldir, name, len,
19fd4bb2 3322 proc_pid_instantiate, iter.task, NULL);
61a28784
EB		 3323}
3324
1da177e4
LT		 3325/* for the /proc/ directory itself, after non-process stuff has been done */
3326int proc_pid_readdir(struct file * filp, void * dirent, filldir_t filldir)
3327{
d8bdc59f
LT		 3328 unsigned int nr;
3329 struct task_struct *reaper;
19fd4bb2 3330 struct tgid_iter iter;
b488893a 3331 struct pid_namespace *ns;
1da177e4 3332
d8bdc59f
LT		 3333 if (filp->f_pos >= PID_MAX_LIMIT + TGID_OFFSET)
3334 goto out_no_task;
3335 nr = filp->f_pos - FIRST_PROCESS_ENTRY;
3336
3337 reaper = get_proc_task(filp->f_path.dentry->d_inode);
61a28784
EB		 3338 if (!reaper)
3339 goto out_no_task;
3340
7bcd6b0e 3341 for (; nr < ARRAY_SIZE(proc_base_stuff); filp->f_pos++, nr++) {
c5141e6d 3342 const struct pid_entry *p = &proc_base_stuff[nr];
61a28784 3343 if (proc_base_fill_cache(filp, dirent, filldir, reaper, p) < 0)
801199ce 3344 goto out;
1da177e4
LT		 3345 }
3346
b488893a 3347 ns = filp->f_dentry->d_sb->s_fs_info;
19fd4bb2
EB		 3348 iter.task = NULL;
3349 iter.tgid = filp->f_pos - TGID_OFFSET;
3350 for (iter = next_tgid(ns, iter);
3351 iter.task;
3352 iter.tgid += 1, iter = next_tgid(ns, iter)) {
3353 filp->f_pos = iter.tgid + TGID_OFFSET;
3354 if (proc_pid_fill_cache(filp, dirent, filldir, iter) < 0) {
3355 put_task_struct(iter.task);
0804ef4b 3356 goto out;
1da177e4 3357 }
0bc58a91 3358 }
0804ef4b
EB		 3359 filp->f_pos = PID_MAX_LIMIT + TGID_OFFSET;
3360out:
61a28784
EB		 3361 put_task_struct(reaper);
3362out_no_task:
0bc58a91
EB		 3363 return 0;
3364}
1da177e4 3365
28a6d671
EB		 3366/*
3367 * Tasks
3368 */
c5141e6d 3369static const struct pid_entry tid_base_stuff[] = {
631f9c18 3370 DIR("fd", S_IRUSR|S_IXUSR, proc_fd_inode_operations, proc_fd_operations),
3835541d 3371 DIR("fdinfo", S_IRUSR|S_IXUSR, proc_fdinfo_inode_operations, proc_fdinfo_operations),
6b4e306a 3372 DIR("ns", S_IRUSR|S_IXUGO, proc_ns_dir_inode_operations, proc_ns_dir_operations),
631f9c18
AD		 3373 REG("environ", S_IRUSR, proc_environ_operations),
3374 INF("auxv", S_IRUSR, proc_pid_auxv),
3375 ONE("status", S_IRUGO, proc_pid_status),
a9712bc1 3376 ONE("personality", S_IRUGO, proc_pid_personality),
3036e7b4 3377 INF("limits", S_IRUGO, proc_pid_limits),
43ae34cb 3378#ifdef CONFIG_SCHED_DEBUG
631f9c18 3379 REG("sched", S_IRUGO|S_IWUSR, proc_pid_sched_operations),
ebcb6734 3380#endif
4614a696 3381 REG("comm", S_IRUGO|S_IWUSR, proc_pid_set_comm_operations),
ebcb6734 3382#ifdef CONFIG_HAVE_ARCH_TRACEHOOK
a9712bc1 3383 INF("syscall", S_IRUGO, proc_pid_syscall),
43ae34cb 3384#endif
631f9c18
AD		 3385 INF("cmdline", S_IRUGO, proc_pid_cmdline),
3386 ONE("stat", S_IRUGO, proc_tid_stat),
3387 ONE("statm", S_IRUGO, proc_pid_statm),
3388 REG("maps", S_IRUGO, proc_maps_operations),
28a6d671 3389#ifdef CONFIG_NUMA
631f9c18 3390 REG("numa_maps", S_IRUGO, proc_numa_maps_operations),
28a6d671 3391#endif
631f9c18
AD		 3392 REG("mem", S_IRUSR|S_IWUSR, proc_mem_operations),
3393 LNK("cwd", proc_cwd_link),
3394 LNK("root", proc_root_link),
3395 LNK("exe", proc_exe_link),
3396 REG("mounts", S_IRUGO, proc_mounts_operations),
3397 REG("mountinfo", S_IRUGO, proc_mountinfo_operations),
1e883281 3398#ifdef CONFIG_PROC_PAGE_MONITOR
631f9c18
AD		 3399 REG("clear_refs", S_IWUSR, proc_clear_refs_operations),
3400 REG("smaps", S_IRUGO, proc_smaps_operations),
ca6b0bf0 3401 REG("pagemap", S_IRUGO, proc_pagemap_operations),
28a6d671
EB		 3402#endif
3403#ifdef CONFIG_SECURITY
631f9c18 3404 DIR("attr", S_IRUGO|S_IXUGO, proc_attr_dir_inode_operations, proc_attr_dir_operations),
28a6d671
EB		 3405#endif
3406#ifdef CONFIG_KALLSYMS
631f9c18 3407 INF("wchan", S_IRUGO, proc_pid_wchan),
28a6d671 3408#endif
2ec220e2 3409#ifdef CONFIG_STACKTRACE
a9712bc1 3410 ONE("stack", S_IRUGO, proc_pid_stack),
28a6d671
EB		 3411#endif
3412#ifdef CONFIG_SCHEDSTATS
631f9c18 3413 INF("schedstat", S_IRUGO, proc_pid_schedstat),
28a6d671 3414#endif
9745512c 3415#ifdef CONFIG_LATENCYTOP
631f9c18 3416 REG("latency", S_IRUGO, proc_lstats_operations),
9745512c 3417#endif
8793d854 3418#ifdef CONFIG_PROC_PID_CPUSET
631f9c18 3419 REG("cpuset", S_IRUGO, proc_cpuset_operations),
a424316c
PM		 3420#endif
3421#ifdef CONFIG_CGROUPS
631f9c18 3422 REG("cgroup", S_IRUGO, proc_cgroup_operations),
28a6d671 3423#endif
631f9c18
AD		 3424 INF("oom_score", S_IRUGO, proc_oom_score),
3425 REG("oom_adj", S_IRUGO|S_IWUSR, proc_oom_adjust_operations),
a63d83f4 3426 REG("oom_score_adj", S_IRUGO|S_IWUSR, proc_oom_score_adj_operations),
28a6d671 3427#ifdef CONFIG_AUDITSYSCALL
631f9c18 3428 REG("loginuid", S_IWUSR|S_IRUGO, proc_loginuid_operations),
26ec3c64 3429 REG("sessionid", S_IRUGO, proc_sessionid_operations),
28a6d671 3430#endif
f4f154fd 3431#ifdef CONFIG_FAULT_INJECTION
631f9c18 3432 REG("make-it-fail", S_IRUGO|S_IWUSR, proc_fault_inject_operations),
f4f154fd 3433#endif
297c5d92 3434#ifdef CONFIG_TASK_IO_ACCOUNTING
1d1221f3 3435 INF("io", S_IRUSR, proc_tid_io_accounting),
297c5d92 3436#endif
f133ecca
CM		 3437#ifdef CONFIG_HARDWALL
3438 INF("hardwall", S_IRUGO, proc_pid_hardwall),
3439#endif
28a6d671
EB		 3440};
3441
3442static int proc_tid_base_readdir(struct file * filp,
3443 void * dirent, filldir_t filldir)
3444{
3445 return proc_pident_readdir(filp,dirent,filldir,
3446 tid_base_stuff,ARRAY_SIZE(tid_base_stuff));
3447}
3448
3449static struct dentry *proc_tid_base_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd){
7bcd6b0e
EB		 3450 return proc_pident_lookup(dir, dentry,
3451 tid_base_stuff, ARRAY_SIZE(tid_base_stuff));
28a6d671
EB		 3452}
3453
00977a59 3454static const struct file_operations proc_tid_base_operations = {
28a6d671
EB		 3455 .read = generic_read_dir,
3456 .readdir = proc_tid_base_readdir,
6038f373 3457 .llseek = default_llseek,
28a6d671
EB		 3458};
3459
c5ef1c42 3460static const struct inode_operations proc_tid_base_inode_operations = {
28a6d671
EB		 3461 .lookup = proc_tid_base_lookup,
3462 .getattr = pid_getattr,
3463 .setattr = proc_setattr,
3464};
3465
444ceed8 3466static struct dentry *proc_task_instantiate(struct inode *dir,
c5141e6d 3467 struct dentry *dentry, struct task_struct *task, const void *ptr)
444ceed8
EB		 3468{
3469 struct dentry *error = ERR_PTR(-ENOENT);
3470 struct inode *inode;
61a28784 3471 inode = proc_pid_make_inode(dir->i_sb, task);
444ceed8
EB		 3472
3473 if (!inode)
3474 goto out;
3475 inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO;
3476 inode->i_op = &proc_tid_base_inode_operations;
3477 inode->i_fop = &proc_tid_base_operations;
3478 inode->i_flags|=S_IMMUTABLE;
aed54175 3479
bfe86848
MS		 3480 set_nlink(inode, 2 + pid_entry_count_dirs(tid_base_stuff,
3481 ARRAY_SIZE(tid_base_stuff)));
444ceed8 3482
fb045adb 3483 d_set_d_op(dentry, &pid_dentry_operations);
444ceed8
EB		 3484
3485 d_add(dentry, inode);
3486 /* Close the race of the process dying before we return the dentry */
3487 if (pid_revalidate(dentry, NULL))
3488 error = NULL;
3489out:
3490 return error;
3491}
3492
28a6d671
EB		 3493static struct dentry *proc_task_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd)
3494{
3495 struct dentry *result = ERR_PTR(-ENOENT);
3496 struct task_struct *task;
3497 struct task_struct *leader = get_proc_task(dir);
28a6d671 3498 unsigned tid;
b488893a 3499 struct pid_namespace *ns;
28a6d671
EB		 3500
3501 if (!leader)
3502 goto out_no_task;
3503
3504 tid = name_to_int(dentry);
3505 if (tid == ~0U)
3506 goto out;
3507
b488893a 3508 ns = dentry->d_sb->s_fs_info;
28a6d671 3509 rcu_read_lock();
b488893a 3510 task = find_task_by_pid_ns(tid, ns);
28a6d671
EB		 3511 if (task)
3512 get_task_struct(task);
3513 rcu_read_unlock();
3514 if (!task)
3515 goto out;
bac0abd6 3516 if (!same_thread_group(leader, task))
28a6d671
EB		 3517 goto out_drop_task;
3518
444ceed8 3519 result = proc_task_instantiate(dir, dentry, task, NULL);
28a6d671
EB		 3520out_drop_task:
3521 put_task_struct(task);
3522out:
3523 put_task_struct(leader);
3524out_no_task:
3525 return result;
3526}
3527
0bc58a91
EB		 3528/*
3529 * Find the first tid of a thread group to return to user space.
3530 *
3531 * Usually this is just the thread group leader, but if the users
3532 * buffer was too small or there was a seek into the middle of the
3533 * directory we have more work todo.
3534 *
3535 * In the case of a short read we start with find_task_by_pid.
3536 *
3537 * In the case of a seek we start with the leader and walk nr
3538 * threads past it.
3539 */
cc288738 3540static struct task_struct *first_tid(struct task_struct *leader,
b488893a 3541 int tid, int nr, struct pid_namespace *ns)
0bc58a91 3542{
a872ff0c 3543 struct task_struct *pos;
1da177e4 3544
cc288738 3545 rcu_read_lock();
0bc58a91
EB		 3546 /* Attempt to start with the pid of a thread */
3547 if (tid && (nr > 0)) {
b488893a 3548 pos = find_task_by_pid_ns(tid, ns);
a872ff0c
ON		 3549 if (pos && (pos->group_leader == leader))
3550 goto found;
0bc58a91 3551 }
1da177e4 3552
0bc58a91 3553 /* If nr exceeds the number of threads there is nothing todo */
a872ff0c
ON		 3554 pos = NULL;
3555 if (nr && nr >= get_nr_threads(leader))
3556 goto out;
1da177e4 3557
a872ff0c
ON		 3558 /* If we haven't found our starting place yet start
3559 * with the leader and walk nr threads forward.
0bc58a91 3560 */
a872ff0c
ON		 3561 for (pos = leader; nr > 0; --nr) {
3562 pos = next_thread(pos);
3563 if (pos == leader) {
3564 pos = NULL;
3565 goto out;
3566 }
1da177e4 3567 }
a872ff0c
ON		 3568found:
3569 get_task_struct(pos);
3570out:
cc288738 3571 rcu_read_unlock();
0bc58a91
EB		 3572 return pos;
3573}
3574
3575/*
3576 * Find the next thread in the thread list.
3577 * Return NULL if there is an error or no next thread.
3578 *
3579 * The reference to the input task_struct is released.
3580 */
3581static struct task_struct *next_tid(struct task_struct *start)
3582{
c1df7fb8 3583 struct task_struct *pos = NULL;
cc288738 3584 rcu_read_lock();
c1df7fb8 3585 if (pid_alive(start)) {
0bc58a91 3586 pos = next_thread(start);
c1df7fb8
ON		 3587 if (thread_group_leader(pos))
3588 pos = NULL;
3589 else
3590 get_task_struct(pos);
3591 }
cc288738 3592 rcu_read_unlock();
0bc58a91
EB		 3593 put_task_struct(start);
3594 return pos;
1da177e4
LT		 3595}
3596
61a28784
EB		 3597static int proc_task_fill_cache(struct file *filp, void *dirent, filldir_t filldir,
3598 struct task_struct *task, int tid)
3599{
3600 char name[PROC_NUMBUF];
3601 int len = snprintf(name, sizeof(name), "%d", tid);
3602 return proc_fill_cache(filp, dirent, filldir, name, len,
3603 proc_task_instantiate, task, NULL);
3604}
3605
1da177e4
LT		 3606/* for the /proc/TGID/task/ directories */
3607static int proc_task_readdir(struct file * filp, void * dirent, filldir_t filldir)
3608{
2fddfeef 3609 struct dentry *dentry = filp->f_path.dentry;
1da177e4 3610 struct inode *inode = dentry->d_inode;
7d895244 3611 struct task_struct *leader = NULL;
0bc58a91 3612 struct task_struct *task;
1da177e4
LT		 3613 int retval = -ENOENT;
3614 ino_t ino;
0bc58a91 3615 int tid;
b488893a 3616 struct pid_namespace *ns;
1da177e4 3617
7d895244
GC		 3618 task = get_proc_task(inode);
3619 if (!task)
3620 goto out_no_task;
3621 rcu_read_lock();
3622 if (pid_alive(task)) {
3623 leader = task->group_leader;
3624 get_task_struct(leader);
3625 }
3626 rcu_read_unlock();
3627 put_task_struct(task);
99f89551
EB		 3628 if (!leader)
3629 goto out_no_task;
1da177e4
LT		 3630 retval = 0;
3631
ee568b25 3632 switch ((unsigned long)filp->f_pos) {
1da177e4
LT		 3633 case 0:
3634 ino = inode->i_ino;
ee6f779b 3635 if (filldir(dirent, ".", 1, filp->f_pos, ino, DT_DIR) < 0)
1da177e4 3636 goto out;
ee6f779b 3637 filp->f_pos++;
1da177e4
LT		 3638 /* fall through */
3639 case 1:
3640 ino = parent_ino(dentry);
ee6f779b 3641 if (filldir(dirent, "..", 2, filp->f_pos, ino, DT_DIR) < 0)
1da177e4 3642 goto out;
ee6f779b 3643 filp->f_pos++;
1da177e4
LT		 3644 /* fall through */
3645 }
3646
0bc58a91
EB		 3647 /* f_version caches the tgid value that the last readdir call couldn't
3648 * return. lseek aka telldir automagically resets f_version to 0.
3649 */
b488893a 3650 ns = filp->f_dentry->d_sb->s_fs_info;
2b47c361 3651 tid = (int)filp->f_version;
0bc58a91 3652 filp->f_version = 0;
ee6f779b 3653 for (task = first_tid(leader, tid, filp->f_pos - 2, ns);
0bc58a91 3654 task;
ee6f779b 3655 task = next_tid(task), filp->f_pos++) {
b488893a 3656 tid = task_pid_nr_ns(task, ns);
61a28784 3657 if (proc_task_fill_cache(filp, dirent, filldir, task, tid) < 0) {
0bc58a91
EB		 3658 /* returning this tgid failed, save it as the first
3659 * pid for the next readir call */
2b47c361 3660 filp->f_version = (u64)tid;
0bc58a91 3661 put_task_struct(task);
1da177e4 3662 break;
0bc58a91 3663 }
1da177e4
LT		 3664 }
3665out:
99f89551
EB		 3666 put_task_struct(leader);
3667out_no_task:
1da177e4
LT		 3668 return retval;
3669}
6e66b52b
EB		 3670
3671static int proc_task_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
3672{
3673 struct inode *inode = dentry->d_inode;
99f89551 3674 struct task_struct *p = get_proc_task(inode);
6e66b52b
EB		 3675 generic_fillattr(inode, stat);
3676
99f89551 3677 if (p) {
99f89551 3678 stat->nlink += get_nr_threads(p);
99f89551 3679 put_task_struct(p);
6e66b52b
EB		 3680 }
3681
3682 return 0;
3683}
28a6d671 3684
c5ef1c42 3685static const struct inode_operations proc_task_inode_operations = {
28a6d671
EB		 3686 .lookup = proc_task_lookup,
3687 .getattr = proc_task_getattr,
3688 .setattr = proc_setattr,
3689};
3690
00977a59 3691static const struct file_operations proc_task_operations = {
28a6d671
EB		 3692 .read = generic_read_dir,
3693 .readdir = proc_task_readdir,
6038f373 3694 .llseek = default_llseek,
28a6d671 3695};
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