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x86: Get rid of 'dubious one-bit signed bitfield' sprase warning
[deliverable/linux.git] / fs / proc / base.c
CommitLineData
1da177e4
LT		 1/*
2 * linux/fs/proc/base.c
3 *
4 * Copyright (C) 1991, 1992 Linus Torvalds
5 *
6 * proc base directory handling functions
7 *
8 * 1999, Al Viro. Rewritten. Now it covers the whole per-process part.
9 * Instead of using magical inumbers to determine the kind of object
10 * we allocate and fill in-core inodes upon lookup. They don't even
11 * go into icache. We cache the reference to task_struct upon lookup too.
12 * Eventually it should become a filesystem in its own. We don't use the
13 * rest of procfs anymore.
e070ad49
ML		 14 *
15 *
16 * Changelog:
17 * 17-Jan-2005
18 * Allan Bezerra
19 * Bruna Moreira <bruna.moreira@indt.org.br>
20 * Edjard Mota <edjard.mota@indt.org.br>
21 * Ilias Biris <ilias.biris@indt.org.br>
22 * Mauricio Lin <mauricio.lin@indt.org.br>
23 *
24 * Embedded Linux Lab - 10LE Instituto Nokia de Tecnologia - INdT
25 *
26 * A new process specific entry (smaps) included in /proc. It shows the
27 * size of rss for each memory area. The maps entry lacks information
28 * about physical memory size (rss) for each mapped file, i.e.,
29 * rss information for executables and library files.
30 * This additional information is useful for any tools that need to know
31 * about physical memory consumption for a process specific library.
32 *
33 * Changelog:
34 * 21-Feb-2005
35 * Embedded Linux Lab - 10LE Instituto Nokia de Tecnologia - INdT
36 * Pud inclusion in the page table walking.
37 *
38 * ChangeLog:
39 * 10-Mar-2005
40 * 10LE Instituto Nokia de Tecnologia - INdT:
41 * A better way to walks through the page table as suggested by Hugh Dickins.
42 *
43 * Simo Piiroinen <simo.piiroinen@nokia.com>:
44 * Smaps information related to shared, private, clean and dirty pages.
45 *
46 * Paul Mundt <paul.mundt@nokia.com>:
47 * Overall revision about smaps.
1da177e4
LT		 48 */
49
50#include <asm/uaccess.h>
51
1da177e4
LT		 52#include <linux/errno.h>
53#include <linux/time.h>
54#include <linux/proc_fs.h>
55#include <linux/stat.h>
5995477a 56#include <linux/task_io_accounting_ops.h>
1da177e4 57#include <linux/init.h>
16f7e0fe 58#include <linux/capability.h>
1da177e4 59#include <linux/file.h>
9f3acc31 60#include <linux/fdtable.h>
1da177e4
LT		 61#include <linux/string.h>
62#include <linux/seq_file.h>
63#include <linux/namei.h>
6b3286ed 64#include <linux/mnt_namespace.h>
1da177e4 65#include <linux/mm.h>
a63d83f4 66#include <linux/swap.h>
b835996f 67#include <linux/rcupdate.h>
1da177e4 68#include <linux/kallsyms.h>
2ec220e2 69#include <linux/stacktrace.h>
d85f50d5 70#include <linux/resource.h>
5096add8 71#include <linux/module.h>
1da177e4
LT		 72#include <linux/mount.h>
73#include <linux/security.h>
74#include <linux/ptrace.h>
0d094efe 75#include <linux/tracehook.h>
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
0499680a
VK		 634/*
635 * May current process learn task's sched/cmdline info (for hide_pid_min=1)
636 * or euid/egid (for hide_pid_min=2)?
637 */
638static bool has_pid_permissions(struct pid_namespace *pid,
639 struct task_struct *task,
640 int hide_pid_min)
641{
642 if (pid->hide_pid < hide_pid_min)
643 return true;
644 if (in_group_p(pid->pid_gid))
645 return true;
646 return ptrace_may_access(task, PTRACE_MODE_READ);
647}
648
649
650static int proc_pid_permission(struct inode *inode, int mask)
651{
652 struct pid_namespace *pid = inode->i_sb->s_fs_info;
653 struct task_struct *task;
654 bool has_perms;
655
656 task = get_proc_task(inode);
657 has_perms = has_pid_permissions(pid, task, 1);
658 put_task_struct(task);
659
660 if (!has_perms) {
661 if (pid->hide_pid == 2) {
662 /*
663 * Let's make getdents(), stat(), and open()
664 * consistent with each other. If a process
665 * may not stat() a file, it shouldn't be seen
666 * in procfs at all.
667 */
668 return -ENOENT;
669 }
670
671 return -EPERM;
672 }
673 return generic_permission(inode, mask);
674}
675
676
677
c5ef1c42 678static const struct inode_operations proc_def_inode_operations = {
6d76fa58
LT		 679 .setattr = proc_setattr,
680};
681
1da177e4
LT		 682#define PROC_BLOCK_SIZE (3*1024) /* 4K page size but our output routines use some slack for overruns */
683
684static ssize_t proc_info_read(struct file * file, char __user * buf,
685 size_t count, loff_t *ppos)
686{
2fddfeef 687 struct inode * inode = file->f_path.dentry->d_inode;
1da177e4
LT		 688 unsigned long page;
689 ssize_t length;
99f89551
EB		 690 struct task_struct *task = get_proc_task(inode);
691
692 length = -ESRCH;
693 if (!task)
694 goto out_no_task;
1da177e4
LT		 695
696 if (count > PROC_BLOCK_SIZE)
697 count = PROC_BLOCK_SIZE;
99f89551
EB		 698
699 length = -ENOMEM;
e12ba74d 700 if (!(page = __get_free_page(GFP_TEMPORARY)))
99f89551 701 goto out;
1da177e4
LT		 702
703 length = PROC_I(inode)->op.proc_read(task, (char*)page);
704
705 if (length >= 0)
706 length = simple_read_from_buffer(buf, count, ppos, (char *)page, length);
707 free_page(page);
99f89551
EB		 708out:
709 put_task_struct(task);
710out_no_task:
1da177e4
LT		 711 return length;
712}
713
00977a59 714static const struct file_operations proc_info_file_operations = {
1da177e4 715 .read = proc_info_read,
87df8424 716 .llseek = generic_file_llseek,
1da177e4
LT		 717};
718
be614086
EB		 719static int proc_single_show(struct seq_file *m, void *v)
720{
721 struct inode *inode = m->private;
722 struct pid_namespace *ns;
723 struct pid *pid;
724 struct task_struct *task;
725 int ret;
726
727 ns = inode->i_sb->s_fs_info;
728 pid = proc_pid(inode);
729 task = get_pid_task(pid, PIDTYPE_PID);
730 if (!task)
731 return -ESRCH;
732
733 ret = PROC_I(inode)->op.proc_show(m, ns, pid, task);
734
735 put_task_struct(task);
736 return ret;
737}
738
739static int proc_single_open(struct inode *inode, struct file *filp)
740{
c6a34058 741 return single_open(filp, proc_single_show, inode);
be614086
EB		 742}
743
744static const struct file_operations proc_single_file_operations = {
745 .open = proc_single_open,
746 .read = seq_read,
747 .llseek = seq_lseek,
748 .release = single_release,
749};
750
1da177e4
LT		 751static int mem_open(struct inode* inode, struct file* file)
752{
753 file->private_data = (void*)((long)current->self_exec_id);
4a3956c7
KH		 754 /* OK to pass negative loff_t, we can catch out-of-range */
755 file->f_mode |= FMODE_UNSIGNED_OFFSET;
1da177e4
LT		 756 return 0;
757}
758
759static ssize_t mem_read(struct file * file, char __user * buf,
760 size_t count, loff_t *ppos)
761{
2fddfeef 762 struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode);
1da177e4
LT		 763 char *page;
764 unsigned long src = *ppos;
765 int ret = -ESRCH;
766 struct mm_struct *mm;
767
99f89551
EB		 768 if (!task)
769 goto out_no_task;
770
1da177e4 771 ret = -ENOMEM;
e12ba74d 772 page = (char *)__get_free_page(GFP_TEMPORARY);
1da177e4
LT		 773 if (!page)
774 goto out;
775
8b0db9db
SW		 776 mm = check_mem_permission(task);
777 ret = PTR_ERR(mm);
778 if (IS_ERR(mm))
1da177e4
LT		 779 goto out_free;
780
781 ret = -EIO;
782
783 if (file->private_data != (void*)((long)current->self_exec_id))
784 goto out_put;
785
786 ret = 0;
787
788 while (count > 0) {
789 int this_len, retval;
790
791 this_len = (count > PAGE_SIZE) ? PAGE_SIZE : count;
8b0db9db
SW		 792 retval = access_remote_vm(mm, src, page, this_len, 0);
793 if (!retval) {
1da177e4
LT		 794 if (!ret)
795 ret = -EIO;
796 break;
797 }
798
799 if (copy_to_user(buf, page, retval)) {
800 ret = -EFAULT;
801 break;
802 }
803
804 ret += retval;
805 src += retval;
806 buf += retval;
807 count -= retval;
808 }
809 *ppos = src;
810
811out_put:
812 mmput(mm);
813out_free:
814 free_page((unsigned long) page);
815out:
99f89551
EB		 816 put_task_struct(task);
817out_no_task:
1da177e4
LT		 818 return ret;
819}
820
63967fa9 821static ssize_t mem_write(struct file * file, const char __user *buf,
1da177e4
LT		 822 size_t count, loff_t *ppos)
823{
f7ca54f4 824 int copied;
1da177e4 825 char *page;
2fddfeef 826 struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode);
1da177e4 827 unsigned long dst = *ppos;
8b0db9db 828 struct mm_struct *mm;
1da177e4 829
99f89551
EB		 830 copied = -ESRCH;
831 if (!task)
832 goto out_no_task;
833
30cd8903
KM		 834 copied = -ENOMEM;
835 page = (char *)__get_free_page(GFP_TEMPORARY);
836 if (!page)
837 goto out_task;
838
8b0db9db
SW		 839 mm = check_mem_permission(task);
840 copied = PTR_ERR(mm);
841 if (IS_ERR(mm))
30cd8903 842 goto out_free;
1da177e4 843
26947f8c
SW		 844 copied = -EIO;
845 if (file->private_data != (void *)((long)current->self_exec_id))
8b0db9db 846 goto out_mm;
1da177e4 847
f7ca54f4 848 copied = 0;
1da177e4
LT		 849 while (count > 0) {
850 int this_len, retval;
851
852 this_len = (count > PAGE_SIZE) ? PAGE_SIZE : count;
853 if (copy_from_user(page, buf, this_len)) {
854 copied = -EFAULT;
855 break;
856 }
8b0db9db 857 retval = access_remote_vm(mm, dst, page, this_len, 1);
1da177e4
LT		 858 if (!retval) {
859 if (!copied)
860 copied = -EIO;
861 break;
862 }
863 copied += retval;
864 buf += retval;
865 dst += retval;
866 count -= retval;
867 }
868 *ppos = dst;
30cd8903 869
8b0db9db
SW		 870out_mm:
871 mmput(mm);
30cd8903
KM		 872out_free:
873 free_page((unsigned long) page);
8b0db9db 874out_task:
99f89551
EB		 875 put_task_struct(task);
876out_no_task:
1da177e4
LT		 877 return copied;
878}
1da177e4 879
85863e47 880loff_t mem_lseek(struct file *file, loff_t offset, int orig)
1da177e4
LT		 881{
882 switch (orig) {
883 case 0:
884 file->f_pos = offset;
885 break;
886 case 1:
887 file->f_pos += offset;
888 break;
889 default:
890 return -EINVAL;
891 }
892 force_successful_syscall_return();
893 return file->f_pos;
894}
895
00977a59 896static const struct file_operations proc_mem_operations = {
1da177e4
LT		 897 .llseek = mem_lseek,
898 .read = mem_read,
899 .write = mem_write,
900 .open = mem_open,
901};
902
315e28c8
JP		 903static ssize_t environ_read(struct file *file, char __user *buf,
904 size_t count, loff_t *ppos)
905{
906 struct task_struct *task = get_proc_task(file->f_dentry->d_inode);
907 char *page;
908 unsigned long src = *ppos;
909 int ret = -ESRCH;
910 struct mm_struct *mm;
911
912 if (!task)
913 goto out_no_task;
914
315e28c8
JP		 915 ret = -ENOMEM;
916 page = (char *)__get_free_page(GFP_TEMPORARY);
917 if (!page)
918 goto out;
919
315e28c8 920
d6f64b89
AV		 921 mm = mm_for_maps(task);
922 ret = PTR_ERR(mm);
923 if (!mm || IS_ERR(mm))
315e28c8
JP		 924 goto out_free;
925
d6f64b89 926 ret = 0;
315e28c8
JP		 927 while (count > 0) {
928 int this_len, retval, max_len;
929
930 this_len = mm->env_end - (mm->env_start + src);
931
932 if (this_len <= 0)
933 break;
934
935 max_len = (count > PAGE_SIZE) ? PAGE_SIZE : count;
936 this_len = (this_len > max_len) ? max_len : this_len;
937
938 retval = access_process_vm(task, (mm->env_start + src),
939 page, this_len, 0);
940
941 if (retval <= 0) {
942 ret = retval;
943 break;
944 }
945
946 if (copy_to_user(buf, page, retval)) {
947 ret = -EFAULT;
948 break;
949 }
950
951 ret += retval;
952 src += retval;
953 buf += retval;
954 count -= retval;
955 }
956 *ppos = src;
957
958 mmput(mm);
959out_free:
960 free_page((unsigned long) page);
961out:
962 put_task_struct(task);
963out_no_task:
964 return ret;
965}
966
967static const struct file_operations proc_environ_operations = {
968 .read = environ_read,
87df8424 969 .llseek = generic_file_llseek,
315e28c8
JP		 970};
971
1da177e4
LT		 972static ssize_t oom_adjust_read(struct file *file, char __user *buf,
973 size_t count, loff_t *ppos)
974{
2fddfeef 975 struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode);
8578cea7 976 char buffer[PROC_NUMBUF];
1da177e4 977 size_t len;
28b83c51
KM		 978 int oom_adjust = OOM_DISABLE;
979 unsigned long flags;
1da177e4 980
99f89551
EB		 981 if (!task)
982 return -ESRCH;
28b83c51
KM		 983
984 if (lock_task_sighand(task, &flags)) {
985 oom_adjust = task->signal->oom_adj;
986 unlock_task_sighand(task, &flags);
987 }
988
99f89551
EB		 989 put_task_struct(task);
990
8578cea7 991 len = snprintf(buffer, sizeof(buffer), "%i\n", oom_adjust);
0c28f287
AM		 992
993 return simple_read_from_buffer(buf, count, ppos, buffer, len);
1da177e4
LT		 994}
995
996static ssize_t oom_adjust_write(struct file *file, const char __user *buf,
997 size_t count, loff_t *ppos)
998{
99f89551 999 struct task_struct *task;
5d863b89 1000 char buffer[PROC_NUMBUF];
0a8cb8e3 1001 int oom_adjust;
28b83c51 1002 unsigned long flags;
5d863b89 1003 int err;
1da177e4 1004
8578cea7
EB		 1005 memset(buffer, 0, sizeof(buffer));
1006 if (count > sizeof(buffer) - 1)
1007 count = sizeof(buffer) - 1;
723548bf
DR		 1008 if (copy_from_user(buffer, buf, count)) {
1009 err = -EFAULT;
1010 goto out;
1011 }
5d863b89 1012
0a8cb8e3 1013 err = kstrtoint(strstrip(buffer), 0, &oom_adjust);
5d863b89 1014 if (err)
723548bf 1015 goto out;
8ac773b4 1016 if ((oom_adjust < OOM_ADJUST_MIN || oom_adjust > OOM_ADJUST_MAX) &&
723548bf
DR		 1017 oom_adjust != OOM_DISABLE) {
1018 err = -EINVAL;
1019 goto out;
1020 }
5d863b89 1021
2fddfeef 1022 task = get_proc_task(file->f_path.dentry->d_inode);
723548bf
DR		 1023 if (!task) {
1024 err = -ESRCH;
1025 goto out;
1026 }
d19d5476
DR		 1027
1028 task_lock(task);
1029 if (!task->mm) {
1030 err = -EINVAL;
1031 goto err_task_lock;
1032 }
1033
28b83c51 1034 if (!lock_task_sighand(task, &flags)) {
723548bf 1035 err = -ESRCH;
d19d5476 1036 goto err_task_lock;
28b83c51
KM		 1037 }
1038
1039 if (oom_adjust < task->signal->oom_adj && !capable(CAP_SYS_RESOURCE)) {
723548bf
DR		 1040 err = -EACCES;
1041 goto err_sighand;
8fb4fc68 1042 }
28b83c51 1043
51b1bd2a
DR		 1044 /*
1045 * Warn that /proc/pid/oom_adj is deprecated, see
1046 * Documentation/feature-removal-schedule.txt.
1047 */
c2142704 1048 printk_once(KERN_WARNING "%s (%d): /proc/%d/oom_adj is deprecated, please use /proc/%d/oom_score_adj instead.\n",
be8f684d
DR		 1049 current->comm, task_pid_nr(current), task_pid_nr(task),
1050 task_pid_nr(task));
28b83c51 1051 task->signal->oom_adj = oom_adjust;
a63d83f4
DR		 1052 /*
1053 * Scale /proc/pid/oom_score_adj appropriately ensuring that a maximum
1054 * value is always attainable.
1055 */
1056 if (task->signal->oom_adj == OOM_ADJUST_MAX)
1057 task->signal->oom_score_adj = OOM_SCORE_ADJ_MAX;
1058 else
1059 task->signal->oom_score_adj = (oom_adjust * OOM_SCORE_ADJ_MAX) /
1060 -OOM_DISABLE;
43d2b113 1061 trace_oom_score_adj_update(task);
723548bf 1062err_sighand:
28b83c51 1063 unlock_task_sighand(task, &flags);
d19d5476
DR		 1064err_task_lock:
1065 task_unlock(task);
99f89551 1066 put_task_struct(task);
723548bf
DR		 1067out:
1068 return err < 0 ? err : count;
1da177e4
LT		 1069}
1070
00977a59 1071static const struct file_operations proc_oom_adjust_operations = {
1da177e4
LT		 1072 .read = oom_adjust_read,
1073 .write = oom_adjust_write,
87df8424 1074 .llseek = generic_file_llseek,
1da177e4
LT		 1075};
1076
a63d83f4
DR		 1077static ssize_t oom_score_adj_read(struct file *file, char __user *buf,
1078 size_t count, loff_t *ppos)
1079{
1080 struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode);
1081 char buffer[PROC_NUMBUF];
1082 int oom_score_adj = OOM_SCORE_ADJ_MIN;
1083 unsigned long flags;
1084 size_t len;
1085
1086 if (!task)
1087 return -ESRCH;
1088 if (lock_task_sighand(task, &flags)) {
1089 oom_score_adj = task->signal->oom_score_adj;
1090 unlock_task_sighand(task, &flags);
1091 }
1092 put_task_struct(task);
1093 len = snprintf(buffer, sizeof(buffer), "%d\n", oom_score_adj);
1094 return simple_read_from_buffer(buf, count, ppos, buffer, len);
1095}
1096
1097static ssize_t oom_score_adj_write(struct file *file, const char __user *buf,
1098 size_t count, loff_t *ppos)
1099{
1100 struct task_struct *task;
1101 char buffer[PROC_NUMBUF];
1102 unsigned long flags;
0a8cb8e3 1103 int oom_score_adj;
a63d83f4
DR		 1104 int err;
1105
1106 memset(buffer, 0, sizeof(buffer));
1107 if (count > sizeof(buffer) - 1)
1108 count = sizeof(buffer) - 1;
723548bf
DR		 1109 if (copy_from_user(buffer, buf, count)) {
1110 err = -EFAULT;
1111 goto out;
1112 }
a63d83f4 1113
0a8cb8e3 1114 err = kstrtoint(strstrip(buffer), 0, &oom_score_adj);
a63d83f4 1115 if (err)
723548bf 1116 goto out;
a63d83f4 1117 if (oom_score_adj < OOM_SCORE_ADJ_MIN ||
723548bf
DR		 1118 oom_score_adj > OOM_SCORE_ADJ_MAX) {
1119 err = -EINVAL;
1120 goto out;
1121 }
a63d83f4
DR		 1122
1123 task = get_proc_task(file->f_path.dentry->d_inode);
723548bf
DR		 1124 if (!task) {
1125 err = -ESRCH;
1126 goto out;
1127 }
d19d5476
DR		 1128
1129 task_lock(task);
1130 if (!task->mm) {
1131 err = -EINVAL;
1132 goto err_task_lock;
1133 }
1134
a63d83f4 1135 if (!lock_task_sighand(task, &flags)) {
723548bf 1136 err = -ESRCH;
d19d5476 1137 goto err_task_lock;
a63d83f4 1138 }
d19d5476 1139
dabb16f6 1140 if (oom_score_adj < task->signal->oom_score_adj_min &&
a63d83f4 1141 !capable(CAP_SYS_RESOURCE)) {
723548bf
DR		 1142 err = -EACCES;
1143 goto err_sighand;
a63d83f4
DR		 1144 }
1145
1146 task->signal->oom_score_adj = oom_score_adj;
dabb16f6
MSB		 1147 if (has_capability_noaudit(current, CAP_SYS_RESOURCE))
1148 task->signal->oom_score_adj_min = oom_score_adj;
43d2b113 1149 trace_oom_score_adj_update(task);
a63d83f4
DR		 1150 /*
1151 * Scale /proc/pid/oom_adj appropriately ensuring that OOM_DISABLE is
1152 * always attainable.
1153 */
1154 if (task->signal->oom_score_adj == OOM_SCORE_ADJ_MIN)
1155 task->signal->oom_adj = OOM_DISABLE;
1156 else
1157 task->signal->oom_adj = (oom_score_adj * OOM_ADJUST_MAX) /
1158 OOM_SCORE_ADJ_MAX;
723548bf 1159err_sighand:
a63d83f4 1160 unlock_task_sighand(task, &flags);
d19d5476
DR		 1161err_task_lock:
1162 task_unlock(task);
a63d83f4 1163 put_task_struct(task);
723548bf
DR		 1164out:
1165 return err < 0 ? err : count;
a63d83f4
DR		 1166}
1167
1168static const struct file_operations proc_oom_score_adj_operations = {
1169 .read = oom_score_adj_read,
1170 .write = oom_score_adj_write,
6038f373 1171 .llseek = default_llseek,
a63d83f4
DR		 1172};
1173
1da177e4
LT		 1174#ifdef CONFIG_AUDITSYSCALL
1175#define TMPBUFLEN 21
1176static ssize_t proc_loginuid_read(struct file * file, char __user * buf,
1177 size_t count, loff_t *ppos)
1178{
2fddfeef 1179 struct inode * inode = file->f_path.dentry->d_inode;
99f89551 1180 struct task_struct *task = get_proc_task(inode);
1da177e4
LT		 1181 ssize_t length;
1182 char tmpbuf[TMPBUFLEN];
1183
99f89551
EB		 1184 if (!task)
1185 return -ESRCH;
1da177e4 1186 length = scnprintf(tmpbuf, TMPBUFLEN, "%u",
0c11b942 1187 audit_get_loginuid(task));
99f89551 1188 put_task_struct(task);
1da177e4
LT		 1189 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1190}
1191
1192static ssize_t proc_loginuid_write(struct file * file, const char __user * buf,
1193 size_t count, loff_t *ppos)
1194{
2fddfeef 1195 struct inode * inode = file->f_path.dentry->d_inode;
1da177e4
LT		 1196 char *page, *tmp;
1197 ssize_t length;
1da177e4
LT		 1198 uid_t loginuid;
1199
1200 if (!capable(CAP_AUDIT_CONTROL))
1201 return -EPERM;
1202
7dc52157
PM		 1203 rcu_read_lock();
1204 if (current != pid_task(proc_pid(inode), PIDTYPE_PID)) {
1205 rcu_read_unlock();
1da177e4 1206 return -EPERM;
7dc52157
PM		 1207 }
1208 rcu_read_unlock();
1da177e4 1209
e0182909
AV		 1210 if (count >= PAGE_SIZE)
1211 count = PAGE_SIZE - 1;
1da177e4
LT		 1212
1213 if (*ppos != 0) {
1214 /* No partial writes. */
1215 return -EINVAL;
1216 }
e12ba74d 1217 page = (char*)__get_free_page(GFP_TEMPORARY);
1da177e4
LT		 1218 if (!page)
1219 return -ENOMEM;
1220 length = -EFAULT;
1221 if (copy_from_user(page, buf, count))
1222 goto out_free_page;
1223
e0182909 1224 page[count] = '\0';
1da177e4
LT		 1225 loginuid = simple_strtoul(page, &tmp, 10);
1226 if (tmp == page) {
1227 length = -EINVAL;
1228 goto out_free_page;
1229
1230 }
99f89551 1231 length = audit_set_loginuid(current, loginuid);
1da177e4
LT		 1232 if (likely(length == 0))
1233 length = count;
1234
1235out_free_page:
1236 free_page((unsigned long) page);
1237 return length;
1238}
1239
00977a59 1240static const struct file_operations proc_loginuid_operations = {
1da177e4
LT		 1241 .read = proc_loginuid_read,
1242 .write = proc_loginuid_write,
87df8424 1243 .llseek = generic_file_llseek,
1da177e4 1244};
1e0bd755
EP		 1245
1246static ssize_t proc_sessionid_read(struct file * file, char __user * buf,
1247 size_t count, loff_t *ppos)
1248{
1249 struct inode * inode = file->f_path.dentry->d_inode;
1250 struct task_struct *task = get_proc_task(inode);
1251 ssize_t length;
1252 char tmpbuf[TMPBUFLEN];
1253
1254 if (!task)
1255 return -ESRCH;
1256 length = scnprintf(tmpbuf, TMPBUFLEN, "%u",
1257 audit_get_sessionid(task));
1258 put_task_struct(task);
1259 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1260}
1261
1262static const struct file_operations proc_sessionid_operations = {
1263 .read = proc_sessionid_read,
87df8424 1264 .llseek = generic_file_llseek,
1e0bd755 1265};
1da177e4
LT		 1266#endif
1267
f4f154fd
AM		 1268#ifdef CONFIG_FAULT_INJECTION
1269static ssize_t proc_fault_inject_read(struct file * file, char __user * buf,
1270 size_t count, loff_t *ppos)
1271{
1272 struct task_struct *task = get_proc_task(file->f_dentry->d_inode);
1273 char buffer[PROC_NUMBUF];
1274 size_t len;
1275 int make_it_fail;
f4f154fd
AM		 1276
1277 if (!task)
1278 return -ESRCH;
1279 make_it_fail = task->make_it_fail;
1280 put_task_struct(task);
1281
1282 len = snprintf(buffer, sizeof(buffer), "%i\n", make_it_fail);
0c28f287
AM		 1283
1284 return simple_read_from_buffer(buf, count, ppos, buffer, len);
f4f154fd
AM		 1285}
1286
1287static ssize_t proc_fault_inject_write(struct file * file,
1288 const char __user * buf, size_t count, loff_t *ppos)
1289{
1290 struct task_struct *task;
1291 char buffer[PROC_NUMBUF], *end;
1292 int make_it_fail;
1293
1294 if (!capable(CAP_SYS_RESOURCE))
1295 return -EPERM;
1296 memset(buffer, 0, sizeof(buffer));
1297 if (count > sizeof(buffer) - 1)
1298 count = sizeof(buffer) - 1;
1299 if (copy_from_user(buffer, buf, count))
1300 return -EFAULT;
cba8aafe
VL		 1301 make_it_fail = simple_strtol(strstrip(buffer), &end, 0);
1302 if (*end)
1303 return -EINVAL;
f4f154fd
AM		 1304 task = get_proc_task(file->f_dentry->d_inode);
1305 if (!task)
1306 return -ESRCH;
1307 task->make_it_fail = make_it_fail;
1308 put_task_struct(task);
cba8aafe
VL		 1309
1310 return count;
f4f154fd
AM		 1311}
1312
00977a59 1313static const struct file_operations proc_fault_inject_operations = {
f4f154fd
AM		 1314 .read = proc_fault_inject_read,
1315 .write = proc_fault_inject_write,
87df8424 1316 .llseek = generic_file_llseek,
f4f154fd
AM		 1317};
1318#endif
1319
9745512c 1320
43ae34cb
IM		 1321#ifdef CONFIG_SCHED_DEBUG
1322/*
1323 * Print out various scheduling related per-task fields:
1324 */
1325static int sched_show(struct seq_file *m, void *v)
1326{
1327 struct inode *inode = m->private;
1328 struct task_struct *p;
1329
43ae34cb
IM		 1330 p = get_proc_task(inode);
1331 if (!p)
1332 return -ESRCH;
1333 proc_sched_show_task(p, m);
1334
1335 put_task_struct(p);
1336
1337 return 0;
1338}
1339
1340static ssize_t
1341sched_write(struct file *file, const char __user *buf,
1342 size_t count, loff_t *offset)
1343{
1344 struct inode *inode = file->f_path.dentry->d_inode;
1345 struct task_struct *p;
1346
43ae34cb
IM		 1347 p = get_proc_task(inode);
1348 if (!p)
1349 return -ESRCH;
1350 proc_sched_set_task(p);
1351
1352 put_task_struct(p);
1353
1354 return count;
1355}
1356
1357static int sched_open(struct inode *inode, struct file *filp)
1358{
c6a34058 1359 return single_open(filp, sched_show, inode);
43ae34cb
IM		 1360}
1361
1362static const struct file_operations proc_pid_sched_operations = {
1363 .open = sched_open,
1364 .read = seq_read,
1365 .write = sched_write,
1366 .llseek = seq_lseek,
5ea473a1 1367 .release = single_release,
43ae34cb
IM		 1368};
1369
1370#endif
1371
5091faa4
MG		 1372#ifdef CONFIG_SCHED_AUTOGROUP
1373/*
1374 * Print out autogroup related information:
1375 */
1376static int sched_autogroup_show(struct seq_file *m, void *v)
1377{
1378 struct inode *inode = m->private;
1379 struct task_struct *p;
1380
1381 p = get_proc_task(inode);
1382 if (!p)
1383 return -ESRCH;
1384 proc_sched_autogroup_show_task(p, m);
1385
1386 put_task_struct(p);
1387
1388 return 0;
1389}
1390
1391static ssize_t
1392sched_autogroup_write(struct file *file, const char __user *buf,
1393 size_t count, loff_t *offset)
1394{
1395 struct inode *inode = file->f_path.dentry->d_inode;
1396 struct task_struct *p;
1397 char buffer[PROC_NUMBUF];
0a8cb8e3 1398 int nice;
5091faa4
MG		 1399 int err;
1400
1401 memset(buffer, 0, sizeof(buffer));
1402 if (count > sizeof(buffer) - 1)
1403 count = sizeof(buffer) - 1;
1404 if (copy_from_user(buffer, buf, count))
1405 return -EFAULT;
1406
0a8cb8e3
AD		 1407 err = kstrtoint(strstrip(buffer), 0, &nice);
1408 if (err < 0)
1409 return err;
5091faa4
MG		 1410
1411 p = get_proc_task(inode);
1412 if (!p)
1413 return -ESRCH;
1414
1415 err = nice;
1416 err = proc_sched_autogroup_set_nice(p, &err);
1417 if (err)
1418 count = err;
1419
1420 put_task_struct(p);
1421
1422 return count;
1423}
1424
1425static int sched_autogroup_open(struct inode *inode, struct file *filp)
1426{
1427 int ret;
1428
1429 ret = single_open(filp, sched_autogroup_show, NULL);
1430 if (!ret) {
1431 struct seq_file *m = filp->private_data;
1432
1433 m->private = inode;
1434 }
1435 return ret;
1436}
1437
1438static const struct file_operations proc_pid_sched_autogroup_operations = {
1439 .open = sched_autogroup_open,
1440 .read = seq_read,
1441 .write = sched_autogroup_write,
1442 .llseek = seq_lseek,
1443 .release = single_release,
1444};
1445
1446#endif /* CONFIG_SCHED_AUTOGROUP */
1447
4614a696 1448static ssize_t comm_write(struct file *file, const char __user *buf,
1449 size_t count, loff_t *offset)
1450{
1451 struct inode *inode = file->f_path.dentry->d_inode;
1452 struct task_struct *p;
1453 char buffer[TASK_COMM_LEN];
1454
1455 memset(buffer, 0, sizeof(buffer));
1456 if (count > sizeof(buffer) - 1)
1457 count = sizeof(buffer) - 1;
1458 if (copy_from_user(buffer, buf, count))
1459 return -EFAULT;
1460
1461 p = get_proc_task(inode);
1462 if (!p)
1463 return -ESRCH;
1464
1465 if (same_thread_group(current, p))
1466 set_task_comm(p, buffer);
1467 else
1468 count = -EINVAL;
1469
1470 put_task_struct(p);
1471
1472 return count;
1473}
1474
1475static int comm_show(struct seq_file *m, void *v)
1476{
1477 struct inode *inode = m->private;
1478 struct task_struct *p;
1479
1480 p = get_proc_task(inode);
1481 if (!p)
1482 return -ESRCH;
1483
1484 task_lock(p);
1485 seq_printf(m, "%s\n", p->comm);
1486 task_unlock(p);
1487
1488 put_task_struct(p);
1489
1490 return 0;
1491}
1492
1493static int comm_open(struct inode *inode, struct file *filp)
1494{
c6a34058 1495 return single_open(filp, comm_show, inode);
4614a696 1496}
1497
1498static const struct file_operations proc_pid_set_comm_operations = {
1499 .open = comm_open,
1500 .read = seq_read,
1501 .write = comm_write,
1502 .llseek = seq_lseek,
1503 .release = single_release,
1504};
1505
7773fbc5 1506static int proc_exe_link(struct dentry *dentry, struct path *exe_path)
925d1c40
MH		 1507{
1508 struct task_struct *task;
1509 struct mm_struct *mm;
1510 struct file *exe_file;
1511
7773fbc5 1512 task = get_proc_task(dentry->d_inode);
925d1c40
MH		 1513 if (!task)
1514 return -ENOENT;
1515 mm = get_task_mm(task);
1516 put_task_struct(task);
1517 if (!mm)
1518 return -ENOENT;
1519 exe_file = get_mm_exe_file(mm);
1520 mmput(mm);
1521 if (exe_file) {
1522 *exe_path = exe_file->f_path;
1523 path_get(&exe_file->f_path);
1524 fput(exe_file);
1525 return 0;
1526 } else
1527 return -ENOENT;
1528}
1529
008b150a 1530static void *proc_pid_follow_link(struct dentry *dentry, struct nameidata *nd)
1da177e4
LT		 1531{
1532 struct inode *inode = dentry->d_inode;
1533 int error = -EACCES;
1534
1535 /* We don't need a base pointer in the /proc filesystem */
1d957f9b 1536 path_put(&nd->path);
1da177e4 1537
778c1144
EB		 1538 /* Are we allowed to snoop on the tasks file descriptors? */
1539 if (!proc_fd_access_allowed(inode))
1da177e4 1540 goto out;
1da177e4 1541
7773fbc5 1542 error = PROC_I(inode)->op.proc_get_link(dentry, &nd->path);
1da177e4 1543out:
008b150a 1544 return ERR_PTR(error);
1da177e4
LT		 1545}
1546
3dcd25f3 1547static int do_proc_readlink(struct path *path, char __user *buffer, int buflen)
1da177e4 1548{
e12ba74d 1549 char *tmp = (char*)__get_free_page(GFP_TEMPORARY);
3dcd25f3 1550 char *pathname;
1da177e4
LT		 1551 int len;
1552
1553 if (!tmp)
1554 return -ENOMEM;
0c28f287 1555
7b2a69ba 1556 pathname = d_path(path, tmp, PAGE_SIZE);
3dcd25f3
JB		 1557 len = PTR_ERR(pathname);
1558 if (IS_ERR(pathname))
1da177e4 1559 goto out;
3dcd25f3 1560 len = tmp + PAGE_SIZE - 1 - pathname;
1da177e4
LT		 1561
1562 if (len > buflen)
1563 len = buflen;
3dcd25f3 1564 if (copy_to_user(buffer, pathname, len))
1da177e4
LT		 1565 len = -EFAULT;
1566 out:
1567 free_page((unsigned long)tmp);
1568 return len;
1569}
1570
1571static int proc_pid_readlink(struct dentry * dentry, char __user * buffer, int buflen)
1572{
1573 int error = -EACCES;
1574 struct inode *inode = dentry->d_inode;
3dcd25f3 1575 struct path path;
1da177e4 1576
778c1144
EB		 1577 /* Are we allowed to snoop on the tasks file descriptors? */
1578 if (!proc_fd_access_allowed(inode))
1da177e4 1579 goto out;
1da177e4 1580
7773fbc5 1581 error = PROC_I(inode)->op.proc_get_link(dentry, &path);
1da177e4
LT		 1582 if (error)
1583 goto out;
1584
3dcd25f3
JB		 1585 error = do_proc_readlink(&path, buffer, buflen);
1586 path_put(&path);
1da177e4 1587out:
1da177e4
LT		 1588 return error;
1589}
1590
c5ef1c42 1591static const struct inode_operations proc_pid_link_inode_operations = {
1da177e4 1592 .readlink = proc_pid_readlink,
6d76fa58
LT		 1593 .follow_link = proc_pid_follow_link,
1594 .setattr = proc_setattr,
1da177e4
LT		 1595};
1596
28a6d671
EB		 1597
1598/* building an inode */
1599
1600static int task_dumpable(struct task_struct *task)
1da177e4 1601{
28a6d671
EB		 1602 int dumpable = 0;
1603 struct mm_struct *mm;
1da177e4 1604
28a6d671
EB		 1605 task_lock(task);
1606 mm = task->mm;
1607 if (mm)
6c5d5238 1608 dumpable = get_dumpable(mm);
28a6d671
EB		 1609 task_unlock(task);
1610 if(dumpable == 1)
1611 return 1;
1612 return 0;
1613}
1da177e4 1614
6b4e306a 1615struct inode *proc_pid_make_inode(struct super_block * sb, struct task_struct *task)
28a6d671
EB		 1616{
1617 struct inode * inode;
1618 struct proc_inode *ei;
c69e8d9c 1619 const struct cred *cred;
1da177e4 1620
28a6d671 1621 /* We need a new inode */
1da177e4 1622
28a6d671
EB		 1623 inode = new_inode(sb);
1624 if (!inode)
1625 goto out;
1626
1627 /* Common stuff */
1628 ei = PROC_I(inode);
85fe4025 1629 inode->i_ino = get_next_ino();
28a6d671 1630 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
28a6d671
EB		 1631 inode->i_op = &proc_def_inode_operations;
1632
1633 /*
1634 * grab the reference to task.
1635 */
1a657f78 1636 ei->pid = get_task_pid(task, PIDTYPE_PID);
28a6d671
EB		 1637 if (!ei->pid)
1638 goto out_unlock;
1639
28a6d671 1640 if (task_dumpable(task)) {
c69e8d9c
DH		 1641 rcu_read_lock();
1642 cred = __task_cred(task);
1643 inode->i_uid = cred->euid;
1644 inode->i_gid = cred->egid;
1645 rcu_read_unlock();
1da177e4 1646 }
28a6d671
EB		 1647 security_task_to_inode(task, inode);
1648
1da177e4 1649out:
28a6d671
EB		 1650 return inode;
1651
1652out_unlock:
1653 iput(inode);
1654 return NULL;
1da177e4
LT		 1655}
1656
6b4e306a 1657int pid_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
1da177e4 1658{
1da177e4 1659 struct inode *inode = dentry->d_inode;
28a6d671 1660 struct task_struct *task;
c69e8d9c 1661 const struct cred *cred;
0499680a 1662 struct pid_namespace *pid = dentry->d_sb->s_fs_info;
c69e8d9c 1663
28a6d671 1664 generic_fillattr(inode, stat);
1da177e4 1665
28a6d671
EB		 1666 rcu_read_lock();
1667 stat->uid = 0;
1668 stat->gid = 0;
1669 task = pid_task(proc_pid(inode), PIDTYPE_PID);
1670 if (task) {
0499680a
VK		 1671 if (!has_pid_permissions(pid, task, 2)) {
1672 rcu_read_unlock();
1673 /*
1674 * This doesn't prevent learning whether PID exists,
1675 * it only makes getattr() consistent with readdir().
1676 */
1677 return -ENOENT;
1678 }
28a6d671
EB		 1679 if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) ||
1680 task_dumpable(task)) {
c69e8d9c
DH		 1681 cred = __task_cred(task);
1682 stat->uid = cred->euid;
1683 stat->gid = cred->egid;
1da177e4
LT		 1684 }
1685 }
28a6d671 1686 rcu_read_unlock();
d6e71144 1687 return 0;
1da177e4
LT		 1688}
1689
1da177e4
LT		 1690/* dentry stuff */
1691
1692/*
1693 * Exceptional case: normally we are not allowed to unhash a busy
1694 * directory. In this case, however, we can do it - no aliasing problems
1695 * due to the way we treat inodes.
1696 *
1697 * Rewrite the inode's ownerships here because the owning task may have
1698 * performed a setuid(), etc.
99f89551
EB		 1699 *
1700 * Before the /proc/pid/status file was created the only way to read
1701 * the effective uid of a /process was to stat /proc/pid. Reading
1702 * /proc/pid/status is slow enough that procps and other packages
1703 * kept stating /proc/pid. To keep the rules in /proc simple I have
1704 * made this apply to all per process world readable and executable
1705 * directories.
1da177e4 1706 */
6b4e306a 1707int pid_revalidate(struct dentry *dentry, struct nameidata *nd)
1da177e4 1708{
34286d66
NP		 1709 struct inode *inode;
1710 struct task_struct *task;
c69e8d9c
DH		 1711 const struct cred *cred;
1712
34286d66
NP		 1713 if (nd && nd->flags & LOOKUP_RCU)
1714 return -ECHILD;
1715
1716 inode = dentry->d_inode;
1717 task = get_proc_task(inode);
1718
99f89551
EB		 1719 if (task) {
1720 if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) ||
1721 task_dumpable(task)) {
c69e8d9c
DH		 1722 rcu_read_lock();
1723 cred = __task_cred(task);
1724 inode->i_uid = cred->euid;
1725 inode->i_gid = cred->egid;
1726 rcu_read_unlock();
1da177e4
LT		 1727 } else {
1728 inode->i_uid = 0;
1729 inode->i_gid = 0;
1730 }
9ee8ab9f 1731 inode->i_mode &= ~(S_ISUID | S_ISGID);
1da177e4 1732 security_task_to_inode(task, inode);
99f89551 1733 put_task_struct(task);
1da177e4
LT		 1734 return 1;
1735 }
1736 d_drop(dentry);
1737 return 0;
1738}
1739
fe15ce44 1740static int pid_delete_dentry(const struct dentry * dentry)
99f89551 1741{
28a6d671
EB		 1742 /* Is the task we represent dead?
1743 * If so, then don't put the dentry on the lru list,
1744 * kill it immediately.
1745 */
1746 return !proc_pid(dentry->d_inode)->tasks[PIDTYPE_PID].first;
1747}
1748
6b4e306a 1749const struct dentry_operations pid_dentry_operations =
28a6d671
EB		 1750{
1751 .d_revalidate = pid_revalidate,
1752 .d_delete = pid_delete_dentry,
1753};
1754
1755/* Lookups */
1756
1c0d04c9
EB		 1757/*
1758 * Fill a directory entry.
1759 *
1760 * If possible create the dcache entry and derive our inode number and
1761 * file type from dcache entry.
1762 *
1763 * Since all of the proc inode numbers are dynamically generated, the inode
1764 * numbers do not exist until the inode is cache. This means creating the
1765 * the dcache entry in readdir is necessary to keep the inode numbers
1766 * reported by readdir in sync with the inode numbers reported
1767 * by stat.
1768 */
6b4e306a
EB		 1769int proc_fill_cache(struct file *filp, void *dirent, filldir_t filldir,
1770 const char *name, int len,
c5141e6d 1771 instantiate_t instantiate, struct task_struct *task, const void *ptr)
61a28784 1772{
2fddfeef 1773 struct dentry *child, *dir = filp->f_path.dentry;
61a28784
EB		 1774 struct inode *inode;
1775 struct qstr qname;
1776 ino_t ino = 0;
1777 unsigned type = DT_UNKNOWN;
1778
1779 qname.name = name;
1780 qname.len = len;
1781 qname.hash = full_name_hash(name, len);
1782
1783 child = d_lookup(dir, &qname);
1784 if (!child) {
1785 struct dentry *new;
1786 new = d_alloc(dir, &qname);
1787 if (new) {
1788 child = instantiate(dir->d_inode, new, task, ptr);
1789 if (child)
1790 dput(new);
1791 else
1792 child = new;
1793 }
1794 }
1795 if (!child || IS_ERR(child) || !child->d_inode)
1796 goto end_instantiate;
1797 inode = child->d_inode;
1798 if (inode) {
1799 ino = inode->i_ino;
1800 type = inode->i_mode >> 12;
1801 }
1802 dput(child);
1803end_instantiate:
1804 if (!ino)
1805 ino = find_inode_number(dir, &qname);
1806 if (!ino)
1807 ino = 1;
1808 return filldir(dirent, name, len, filp->f_pos, ino, type);
1809}
1810
28a6d671
EB		 1811static unsigned name_to_int(struct dentry *dentry)
1812{
1813 const char *name = dentry->d_name.name;
1814 int len = dentry->d_name.len;
1815 unsigned n = 0;
1816
1817 if (len > 1 && *name == '0')
1818 goto out;
1819 while (len-- > 0) {
1820 unsigned c = *name++ - '0';
1821 if (c > 9)
1822 goto out;
1823 if (n >= (~0U-9)/10)
1824 goto out;
1825 n *= 10;
1826 n += c;
1827 }
1828 return n;
1829out:
1830 return ~0U;
1831}
1832
27932742
MS		 1833#define PROC_FDINFO_MAX 64
1834
3dcd25f3 1835static int proc_fd_info(struct inode *inode, struct path *path, char *info)
28a6d671 1836{
5e442a49
LT		 1837 struct task_struct *task = get_proc_task(inode);
1838 struct files_struct *files = NULL;
28a6d671
EB		 1839 struct file *file;
1840 int fd = proc_fd(inode);
aa6afca5 1841
5e442a49
LT		 1842 if (task) {
1843 files = get_files_struct(task);
1844 put_task_struct(task);
1845 }
1846 if (files) {
1847 /*
1848 * We are not taking a ref to the file structure, so we must
1849 * hold ->file_lock.
1850 */
1851 spin_lock(&files->file_lock);
1852 file = fcheck_files(files, fd);
1853 if (file) {
1854 unsigned int f_flags;
1855 struct fdtable *fdt;
1856
1857 fdt = files_fdtable(files);
1858 f_flags = file->f_flags & ~O_CLOEXEC;
1859 if (FD_ISSET(fd, fdt->close_on_exec))
1860 f_flags |= O_CLOEXEC;
1861
1862 if (path) {
1863 *path = file->f_path;
1864 path_get(&file->f_path);
1865 }
1866 if (info)
1867 snprintf(info, PROC_FDINFO_MAX,
1868 "pos:\t%lli\n"
1869 "flags:\t0%o\n",
1870 (long long) file->f_pos,
1871 f_flags);
1872 spin_unlock(&files->file_lock);
1873 put_files_struct(files);
1874 return 0;
99f89551 1875 }
5e442a49
LT		 1876 spin_unlock(&files->file_lock);
1877 put_files_struct(files);
1878 }
1879 return -ENOENT;
99f89551
EB		 1880}
1881
7773fbc5 1882static int proc_fd_link(struct dentry *dentry, struct path *path)
27932742 1883{
7773fbc5 1884 return proc_fd_info(dentry->d_inode, path, NULL);
27932742
MS		 1885}
1886
1da177e4
LT		 1887static int tid_fd_revalidate(struct dentry *dentry, struct nameidata *nd)
1888{
34286d66
NP		 1889 struct inode *inode;
1890 struct task_struct *task;
1891 int fd;
1da177e4 1892 struct files_struct *files;
c69e8d9c 1893 const struct cred *cred;
1da177e4 1894
34286d66
NP		 1895 if (nd && nd->flags & LOOKUP_RCU)
1896 return -ECHILD;
1897
1898 inode = dentry->d_inode;
1899 task = get_proc_task(inode);
1900 fd = proc_fd(inode);
1901
99f89551
EB		 1902 if (task) {
1903 files = get_files_struct(task);
1904 if (files) {
1905 rcu_read_lock();
1906 if (fcheck_files(files, fd)) {
1907 rcu_read_unlock();
1908 put_files_struct(files);
1909 if (task_dumpable(task)) {
c69e8d9c
DH		 1910 rcu_read_lock();
1911 cred = __task_cred(task);
1912 inode->i_uid = cred->euid;
1913 inode->i_gid = cred->egid;
1914 rcu_read_unlock();
99f89551
EB		 1915 } else {
1916 inode->i_uid = 0;
1917 inode->i_gid = 0;
1918 }
9ee8ab9f 1919 inode->i_mode &= ~(S_ISUID | S_ISGID);
99f89551
EB		 1920 security_task_to_inode(task, inode);
1921 put_task_struct(task);
1922 return 1;
1923 }
b835996f 1924 rcu_read_unlock();
1da177e4 1925 put_files_struct(files);
1da177e4 1926 }
99f89551 1927 put_task_struct(task);
1da177e4
LT		 1928 }
1929 d_drop(dentry);
1930 return 0;
1931}
1932
d72f71eb 1933static const struct dentry_operations tid_fd_dentry_operations =
1da177e4
LT		 1934{
1935 .d_revalidate = tid_fd_revalidate,
1936 .d_delete = pid_delete_dentry,
1937};
1938
444ceed8 1939static struct dentry *proc_fd_instantiate(struct inode *dir,
c5141e6d 1940 struct dentry *dentry, struct task_struct *task, const void *ptr)
1da177e4 1941{
c5141e6d 1942 unsigned fd = *(const unsigned *)ptr;
444ceed8
EB		 1943 struct file *file;
1944 struct files_struct *files;
1945 struct inode *inode;
1946 struct proc_inode *ei;
1947 struct dentry *error = ERR_PTR(-ENOENT);
1da177e4 1948
61a28784 1949 inode = proc_pid_make_inode(dir->i_sb, task);
1da177e4
LT		 1950 if (!inode)
1951 goto out;
1952 ei = PROC_I(inode);
aed7a6c4 1953 ei->fd = fd;
1da177e4
LT		 1954 files = get_files_struct(task);
1955 if (!files)
444ceed8 1956 goto out_iput;
1da177e4 1957 inode->i_mode = S_IFLNK;
ca99c1da
DS		 1958
1959 /*
1960 * We are not taking a ref to the file structure, so we must
1961 * hold ->file_lock.
1962 */
1963 spin_lock(&files->file_lock);
1da177e4
LT		 1964 file = fcheck_files(files, fd);
1965 if (!file)
444ceed8 1966 goto out_unlock;
aeb5d727 1967 if (file->f_mode & FMODE_READ)
1da177e4 1968 inode->i_mode |= S_IRUSR | S_IXUSR;
aeb5d727 1969 if (file->f_mode & FMODE_WRITE)
1da177e4 1970 inode->i_mode |= S_IWUSR | S_IXUSR;
ca99c1da 1971 spin_unlock(&files->file_lock);
1da177e4 1972 put_files_struct(files);
444ceed8 1973
5e442a49 1974 inode->i_op = &proc_pid_link_inode_operations;
1da177e4
LT		 1975 inode->i_size = 64;
1976 ei->op.proc_get_link = proc_fd_link;
fb045adb 1977 d_set_d_op(dentry, &tid_fd_dentry_operations);
1da177e4 1978 d_add(dentry, inode);
cd6a3ce9
EB		 1979 /* Close the race of the process dying before we return the dentry */
1980 if (tid_fd_revalidate(dentry, NULL))
444ceed8 1981 error = NULL;
1da177e4 1982
444ceed8
EB		 1983 out:
1984 return error;
1985out_unlock:
ca99c1da 1986 spin_unlock(&files->file_lock);
1da177e4 1987 put_files_struct(files);
444ceed8 1988out_iput:
1da177e4 1989 iput(inode);
cd6a3ce9 1990 goto out;
1da177e4
LT		 1991}
1992
27932742
MS		 1993static struct dentry *proc_lookupfd_common(struct inode *dir,
1994 struct dentry *dentry,
1995 instantiate_t instantiate)
444ceed8
EB		 1996{
1997 struct task_struct *task = get_proc_task(dir);
1998 unsigned fd = name_to_int(dentry);
1999 struct dentry *result = ERR_PTR(-ENOENT);
2000
2001 if (!task)
2002 goto out_no_task;
2003 if (fd == ~0U)
2004 goto out;
2005
27932742 2006 result = instantiate(dir, dentry, task, &fd);
444ceed8
EB		 2007out:
2008 put_task_struct(task);
2009out_no_task:
2010 return result;
2011}
2012
27932742
MS		 2013static int proc_readfd_common(struct file * filp, void * dirent,
2014 filldir_t filldir, instantiate_t instantiate)
28a6d671 2015{
2fddfeef 2016 struct dentry *dentry = filp->f_path.dentry;
28a6d671
EB		 2017 struct inode *inode = dentry->d_inode;
2018 struct task_struct *p = get_proc_task(inode);
457c2510 2019 unsigned int fd, ino;
28a6d671 2020 int retval;
28a6d671 2021 struct files_struct * files;
1da177e4 2022
28a6d671
EB		 2023 retval = -ENOENT;
2024 if (!p)
2025 goto out_no_task;
2026 retval = 0;
28a6d671
EB		 2027
2028 fd = filp->f_pos;
2029 switch (fd) {
2030 case 0:
2031 if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0)
5e442a49 2032 goto out;
28a6d671
EB		 2033 filp->f_pos++;
2034 case 1:
2035 ino = parent_ino(dentry);
2036 if (filldir(dirent, "..", 2, 1, ino, DT_DIR) < 0)
5e442a49 2037 goto out;
28a6d671
EB		 2038 filp->f_pos++;
2039 default:
2040 files = get_files_struct(p);
2041 if (!files)
5e442a49 2042 goto out;
28a6d671 2043 rcu_read_lock();
28a6d671 2044 for (fd = filp->f_pos-2;
9b4f526c 2045 fd < files_fdtable(files)->max_fds;
28a6d671 2046 fd++, filp->f_pos++) {
27932742
MS		 2047 char name[PROC_NUMBUF];
2048 int len;
28a6d671
EB		 2049
2050 if (!fcheck_files(files, fd))
2051 continue;
2052 rcu_read_unlock();
2053
27932742
MS		 2054 len = snprintf(name, sizeof(name), "%d", fd);
2055 if (proc_fill_cache(filp, dirent, filldir,
2056 name, len, instantiate,
2057 p, &fd) < 0) {
28a6d671
EB		 2058 rcu_read_lock();
2059 break;
2060 }
2061 rcu_read_lock();
2062 }
2063 rcu_read_unlock();
2064 put_files_struct(files);
2065 }
2066out:
2067 put_task_struct(p);
2068out_no_task:
2069 return retval;
2070}
2071
27932742
MS		 2072static struct dentry *proc_lookupfd(struct inode *dir, struct dentry *dentry,
2073 struct nameidata *nd)
2074{
2075 return proc_lookupfd_common(dir, dentry, proc_fd_instantiate);
2076}
2077
2078static int proc_readfd(struct file *filp, void *dirent, filldir_t filldir)
2079{
2080 return proc_readfd_common(filp, dirent, filldir, proc_fd_instantiate);
2081}
2082
2083static ssize_t proc_fdinfo_read(struct file *file, char __user *buf,
2084 size_t len, loff_t *ppos)
2085{
2086 char tmp[PROC_FDINFO_MAX];
3dcd25f3 2087 int err = proc_fd_info(file->f_path.dentry->d_inode, NULL, tmp);
27932742
MS		 2088 if (!err)
2089 err = simple_read_from_buffer(buf, len, ppos, tmp, strlen(tmp));
2090 return err;
2091}
2092
2093static const struct file_operations proc_fdinfo_file_operations = {
87df8424 2094 .open = nonseekable_open,
27932742 2095 .read = proc_fdinfo_read,
6038f373 2096 .llseek = no_llseek,
27932742
MS		 2097};
2098
00977a59 2099static const struct file_operations proc_fd_operations = {
28a6d671
EB		 2100 .read = generic_read_dir,
2101 .readdir = proc_readfd,
6038f373 2102 .llseek = default_llseek,
1da177e4
LT		 2103};
2104
640708a2
PE		 2105#ifdef CONFIG_CHECKPOINT_RESTORE
2106
2107/*
2108 * dname_to_vma_addr - maps a dentry name into two unsigned longs
2109 * which represent vma start and end addresses.
2110 */
2111static int dname_to_vma_addr(struct dentry *dentry,
2112 unsigned long *start, unsigned long *end)
2113{
2114 if (sscanf(dentry->d_name.name, "%lx-%lx", start, end) != 2)
2115 return -EINVAL;
2116
2117 return 0;
2118}
2119
2120static int map_files_d_revalidate(struct dentry *dentry, struct nameidata *nd)
2121{
2122 unsigned long vm_start, vm_end;
2123 bool exact_vma_exists = false;
2124 struct mm_struct *mm = NULL;
2125 struct task_struct *task;
2126 const struct cred *cred;
2127 struct inode *inode;
2128 int status = 0;
2129
2130 if (nd && nd->flags & LOOKUP_RCU)
2131 return -ECHILD;
2132
2133 if (!capable(CAP_SYS_ADMIN)) {
2134 status = -EACCES;
2135 goto out_notask;
2136 }
2137
2138 inode = dentry->d_inode;
2139 task = get_proc_task(inode);
2140 if (!task)
2141 goto out_notask;
2142
2143 if (!ptrace_may_access(task, PTRACE_MODE_READ))
2144 goto out;
2145
2146 mm = get_task_mm(task);
2147 if (!mm)
2148 goto out;
2149
2150 if (!dname_to_vma_addr(dentry, &vm_start, &vm_end)) {
2151 down_read(&mm->mmap_sem);
2152 exact_vma_exists = !!find_exact_vma(mm, vm_start, vm_end);
2153 up_read(&mm->mmap_sem);
2154 }
2155
2156 mmput(mm);
2157
2158 if (exact_vma_exists) {
2159 if (task_dumpable(task)) {
2160 rcu_read_lock();
2161 cred = __task_cred(task);
2162 inode->i_uid = cred->euid;
2163 inode->i_gid = cred->egid;
2164 rcu_read_unlock();
2165 } else {
2166 inode->i_uid = 0;
2167 inode->i_gid = 0;
2168 }
2169 security_task_to_inode(task, inode);
2170 status = 1;
2171 }
2172
2173out:
2174 put_task_struct(task);
2175
2176out_notask:
2177 if (status <= 0)
2178 d_drop(dentry);
2179
2180 return status;
2181}
2182
2183static const struct dentry_operations tid_map_files_dentry_operations = {
2184 .d_revalidate = map_files_d_revalidate,
2185 .d_delete = pid_delete_dentry,
2186};
2187
2188static int proc_map_files_get_link(struct dentry *dentry, struct path *path)
2189{
2190 unsigned long vm_start, vm_end;
2191 struct vm_area_struct *vma;
2192 struct task_struct *task;
2193 struct mm_struct *mm;
2194 int rc;
2195
2196 rc = -ENOENT;
2197 task = get_proc_task(dentry->d_inode);
2198 if (!task)
2199 goto out;
2200
2201 mm = get_task_mm(task);
2202 put_task_struct(task);
2203 if (!mm)
2204 goto out;
2205
2206 rc = dname_to_vma_addr(dentry, &vm_start, &vm_end);
2207 if (rc)
2208 goto out_mmput;
2209
2210 down_read(&mm->mmap_sem);
2211 vma = find_exact_vma(mm, vm_start, vm_end);
2212 if (vma && vma->vm_file) {
2213 *path = vma->vm_file->f_path;
2214 path_get(path);
2215 rc = 0;
2216 }
2217 up_read(&mm->mmap_sem);
2218
2219out_mmput:
2220 mmput(mm);
2221out:
2222 return rc;
2223}
2224
2225struct map_files_info {
2226 struct file *file;
2227 unsigned long len;
2228 unsigned char name[4*sizeof(long)+2]; /* max: %lx-%lx\0 */
2229};
2230
2231static struct dentry *
2232proc_map_files_instantiate(struct inode *dir, struct dentry *dentry,
2233 struct task_struct *task, const void *ptr)
2234{
2235 const struct file *file = ptr;
2236 struct proc_inode *ei;
2237 struct inode *inode;
2238
2239 if (!file)
2240 return ERR_PTR(-ENOENT);
2241
2242 inode = proc_pid_make_inode(dir->i_sb, task);
2243 if (!inode)
2244 return ERR_PTR(-ENOENT);
2245
2246 ei = PROC_I(inode);
2247 ei->op.proc_get_link = proc_map_files_get_link;
2248
2249 inode->i_op = &proc_pid_link_inode_operations;
2250 inode->i_size = 64;
2251 inode->i_mode = S_IFLNK;
2252
2253 if (file->f_mode & FMODE_READ)
2254 inode->i_mode |= S_IRUSR;
2255 if (file->f_mode & FMODE_WRITE)
2256 inode->i_mode |= S_IWUSR;
2257
2258 d_set_d_op(dentry, &tid_map_files_dentry_operations);
2259 d_add(dentry, inode);
2260
2261 return NULL;
2262}
2263
2264static struct dentry *proc_map_files_lookup(struct inode *dir,
2265 struct dentry *dentry, struct nameidata *nd)
2266{
2267 unsigned long vm_start, vm_end;
2268 struct vm_area_struct *vma;
2269 struct task_struct *task;
2270 struct dentry *result;
2271 struct mm_struct *mm;
2272
2273 result = ERR_PTR(-EACCES);
2274 if (!capable(CAP_SYS_ADMIN))
2275 goto out;
2276
2277 result = ERR_PTR(-ENOENT);
2278 task = get_proc_task(dir);
2279 if (!task)
2280 goto out;
2281
2282 result = ERR_PTR(-EACCES);
2283 if (lock_trace(task))
2284 goto out_put_task;
2285
2286 result = ERR_PTR(-ENOENT);
2287 if (dname_to_vma_addr(dentry, &vm_start, &vm_end))
2288 goto out_unlock;
2289
2290 mm = get_task_mm(task);
2291 if (!mm)
2292 goto out_unlock;
2293
2294 down_read(&mm->mmap_sem);
2295 vma = find_exact_vma(mm, vm_start, vm_end);
2296 if (!vma)
2297 goto out_no_vma;
2298
2299 result = proc_map_files_instantiate(dir, dentry, task, vma->vm_file);
2300
2301out_no_vma:
2302 up_read(&mm->mmap_sem);
2303 mmput(mm);
2304out_unlock:
2305 unlock_trace(task);
2306out_put_task:
2307 put_task_struct(task);
2308out:
2309 return result;
2310}
2311
2312static const struct inode_operations proc_map_files_inode_operations = {
2313 .lookup = proc_map_files_lookup,
2314 .permission = proc_fd_permission,
2315 .setattr = proc_setattr,
2316};
2317
2318static int
2319proc_map_files_readdir(struct file *filp, void *dirent, filldir_t filldir)
2320{
2321 struct dentry *dentry = filp->f_path.dentry;
2322 struct inode *inode = dentry->d_inode;
2323 struct vm_area_struct *vma;
2324 struct task_struct *task;
2325 struct mm_struct *mm;
2326 ino_t ino;
2327 int ret;
2328
2329 ret = -EACCES;
2330 if (!capable(CAP_SYS_ADMIN))
2331 goto out;
2332
2333 ret = -ENOENT;
2334 task = get_proc_task(inode);
2335 if (!task)
2336 goto out;
2337
2338 ret = -EACCES;
2339 if (lock_trace(task))
2340 goto out_put_task;
2341
2342 ret = 0;
2343 switch (filp->f_pos) {
2344 case 0:
2345 ino = inode->i_ino;
2346 if (filldir(dirent, ".", 1, 0, ino, DT_DIR) < 0)
2347 goto out_unlock;
2348 filp->f_pos++;
2349 case 1:
2350 ino = parent_ino(dentry);
2351 if (filldir(dirent, "..", 2, 1, ino, DT_DIR) < 0)
2352 goto out_unlock;
2353 filp->f_pos++;
2354 default:
2355 {
2356 unsigned long nr_files, pos, i;
2357 struct flex_array *fa = NULL;
2358 struct map_files_info info;
2359 struct map_files_info *p;
2360
2361 mm = get_task_mm(task);
2362 if (!mm)
2363 goto out_unlock;
2364 down_read(&mm->mmap_sem);
2365
2366 nr_files = 0;
2367
2368 /*
2369 * We need two passes here:
2370 *
2371 * 1) Collect vmas of mapped files with mmap_sem taken
2372 * 2) Release mmap_sem and instantiate entries
2373 *
2374 * otherwise we get lockdep complained, since filldir()
2375 * routine might require mmap_sem taken in might_fault().
2376 */
2377
2378 for (vma = mm->mmap, pos = 2; vma; vma = vma->vm_next) {
2379 if (vma->vm_file && ++pos > filp->f_pos)
2380 nr_files++;
2381 }
2382
2383 if (nr_files) {
2384 fa = flex_array_alloc(sizeof(info), nr_files,
2385 GFP_KERNEL);
2386 if (!fa || flex_array_prealloc(fa, 0, nr_files,
2387 GFP_KERNEL)) {
2388 ret = -ENOMEM;
2389 if (fa)
2390 flex_array_free(fa);
2391 up_read(&mm->mmap_sem);
2392 mmput(mm);
2393 goto out_unlock;
2394 }
2395 for (i = 0, vma = mm->mmap, pos = 2; vma;
2396 vma = vma->vm_next) {
2397 if (!vma->vm_file)
2398 continue;
2399 if (++pos <= filp->f_pos)
2400 continue;
2401
2402 get_file(vma->vm_file);
2403 info.file = vma->vm_file;
2404 info.len = snprintf(info.name,
2405 sizeof(info.name), "%lx-%lx",
2406 vma->vm_start, vma->vm_end);
2407 if (flex_array_put(fa, i++, &info, GFP_KERNEL))
2408 BUG();
2409 }
2410 }
2411 up_read(&mm->mmap_sem);
2412
2413 for (i = 0; i < nr_files; i++) {
2414 p = flex_array_get(fa, i);
2415 ret = proc_fill_cache(filp, dirent, filldir,
2416 p->name, p->len,
2417 proc_map_files_instantiate,
2418 task, p->file);
2419 if (ret)
2420 break;
2421 filp->f_pos++;
2422 fput(p->file);
2423 }
2424 for (; i < nr_files; i++) {
2425 /*
2426 * In case of error don't forget
2427 * to put rest of file refs.
2428 */
2429 p = flex_array_get(fa, i);
2430 fput(p->file);
2431 }
2432 if (fa)
2433 flex_array_free(fa);
2434 mmput(mm);
2435 }
2436 }
2437
2438out_unlock:
2439 unlock_trace(task);
2440out_put_task:
2441 put_task_struct(task);
2442out:
2443 return ret;
2444}
2445
2446static const struct file_operations proc_map_files_operations = {
2447 .read = generic_read_dir,
2448 .readdir = proc_map_files_readdir,
2449 .llseek = default_llseek,
2450};
2451
2452#endif /* CONFIG_CHECKPOINT_RESTORE */
2453
8948e11f
AD		 2454/*
2455 * /proc/pid/fd needs a special permission handler so that a process can still
2456 * access /proc/self/fd after it has executed a setuid().
2457 */
10556cb2 2458static int proc_fd_permission(struct inode *inode, int mask)
8948e11f 2459{
2830ba7f 2460 int rv = generic_permission(inode, mask);
8948e11f
AD		 2461 if (rv == 0)
2462 return 0;
2463 if (task_pid(current) == proc_pid(inode))
2464 rv = 0;
2465 return rv;
2466}
2467
1da177e4
LT		 2468/*
2469 * proc directories can do almost nothing..
2470 */
c5ef1c42 2471static const struct inode_operations proc_fd_inode_operations = {
1da177e4 2472 .lookup = proc_lookupfd,
8948e11f 2473 .permission = proc_fd_permission,
6d76fa58 2474 .setattr = proc_setattr,
1da177e4
LT		 2475};
2476
27932742
MS		 2477static struct dentry *proc_fdinfo_instantiate(struct inode *dir,
2478 struct dentry *dentry, struct task_struct *task, const void *ptr)
2479{
2480 unsigned fd = *(unsigned *)ptr;
2481 struct inode *inode;
2482 struct proc_inode *ei;
2483 struct dentry *error = ERR_PTR(-ENOENT);
2484
2485 inode = proc_pid_make_inode(dir->i_sb, task);
2486 if (!inode)
2487 goto out;
2488 ei = PROC_I(inode);
2489 ei->fd = fd;
2490 inode->i_mode = S_IFREG | S_IRUSR;
2491 inode->i_fop = &proc_fdinfo_file_operations;
fb045adb 2492 d_set_d_op(dentry, &tid_fd_dentry_operations);
27932742
MS		 2493 d_add(dentry, inode);
2494 /* Close the race of the process dying before we return the dentry */
2495 if (tid_fd_revalidate(dentry, NULL))
2496 error = NULL;
2497
2498 out:
2499 return error;
2500}
2501
2502static struct dentry *proc_lookupfdinfo(struct inode *dir,
2503 struct dentry *dentry,
2504 struct nameidata *nd)
2505{
2506 return proc_lookupfd_common(dir, dentry, proc_fdinfo_instantiate);
2507}
2508
2509static int proc_readfdinfo(struct file *filp, void *dirent, filldir_t filldir)
2510{
2511 return proc_readfd_common(filp, dirent, filldir,
2512 proc_fdinfo_instantiate);
2513}
2514
2515static const struct file_operations proc_fdinfo_operations = {
2516 .read = generic_read_dir,
2517 .readdir = proc_readfdinfo,
6038f373 2518 .llseek = default_llseek,
27932742
MS		 2519};
2520
2521/*
2522 * proc directories can do almost nothing..
2523 */
2524static const struct inode_operations proc_fdinfo_inode_operations = {
2525 .lookup = proc_lookupfdinfo,
2526 .setattr = proc_setattr,
2527};
2528
2529
444ceed8 2530static struct dentry *proc_pident_instantiate(struct inode *dir,
c5141e6d 2531 struct dentry *dentry, struct task_struct *task, const void *ptr)
444ceed8 2532{
c5141e6d 2533 const struct pid_entry *p = ptr;
444ceed8
EB		 2534 struct inode *inode;
2535 struct proc_inode *ei;
bd6daba9 2536 struct dentry *error = ERR_PTR(-ENOENT);
444ceed8 2537
61a28784 2538 inode = proc_pid_make_inode(dir->i_sb, task);
444ceed8
EB		 2539 if (!inode)
2540 goto out;
2541
2542 ei = PROC_I(inode);
2543 inode->i_mode = p->mode;
2544 if (S_ISDIR(inode->i_mode))
bfe86848 2545 set_nlink(inode, 2); /* Use getattr to fix if necessary */
444ceed8
EB		 2546 if (p->iop)
2547 inode->i_op = p->iop;
2548 if (p->fop)
2549 inode->i_fop = p->fop;
2550 ei->op = p->op;
fb045adb 2551 d_set_d_op(dentry, &pid_dentry_operations);
444ceed8
EB		 2552 d_add(dentry, inode);
2553 /* Close the race of the process dying before we return the dentry */
2554 if (pid_revalidate(dentry, NULL))
2555 error = NULL;
2556out:
2557 return error;
2558}
2559
1da177e4
LT		 2560static struct dentry *proc_pident_lookup(struct inode *dir,
2561 struct dentry *dentry,
c5141e6d 2562 const struct pid_entry *ents,
7bcd6b0e 2563 unsigned int nents)
1da177e4 2564{
cd6a3ce9 2565 struct dentry *error;
99f89551 2566 struct task_struct *task = get_proc_task(dir);
c5141e6d 2567 const struct pid_entry *p, *last;
1da177e4 2568
cd6a3ce9 2569 error = ERR_PTR(-ENOENT);
1da177e4 2570
99f89551
EB		 2571 if (!task)
2572 goto out_no_task;
1da177e4 2573
20cdc894
EB		 2574 /*
2575 * Yes, it does not scale. And it should not. Don't add
2576 * new entries into /proc/<tgid>/ without very good reasons.
2577 */
7bcd6b0e
EB		 2578 last = &ents[nents - 1];
2579 for (p = ents; p <= last; p++) {
1da177e4
LT		 2580 if (p->len != dentry->d_name.len)
2581 continue;
2582 if (!memcmp(dentry->d_name.name, p->name, p->len))
2583 break;
2584 }
7bcd6b0e 2585 if (p > last)
1da177e4
LT		 2586 goto out;
2587
444ceed8 2588 error = proc_pident_instantiate(dir, dentry, task, p);
1da177e4 2589out:
99f89551
EB		 2590 put_task_struct(task);
2591out_no_task:
cd6a3ce9 2592 return error;
1da177e4
LT		 2593}
2594
c5141e6d
ED		 2595static int proc_pident_fill_cache(struct file *filp, void *dirent,
2596 filldir_t filldir, struct task_struct *task, const struct pid_entry *p)
61a28784
EB		 2597{
2598 return proc_fill_cache(filp, dirent, filldir, p->name, p->len,
2599 proc_pident_instantiate, task, p);
2600}
2601
28a6d671
EB		 2602static int proc_pident_readdir(struct file *filp,
2603 void *dirent, filldir_t filldir,
c5141e6d 2604 const struct pid_entry *ents, unsigned int nents)
28a6d671
EB		 2605{
2606 int i;
2fddfeef 2607 struct dentry *dentry = filp->f_path.dentry;
28a6d671
EB		 2608 struct inode *inode = dentry->d_inode;
2609 struct task_struct *task = get_proc_task(inode);
c5141e6d 2610 const struct pid_entry *p, *last;
28a6d671
EB		 2611 ino_t ino;
2612 int ret;
2613
2614 ret = -ENOENT;
2615 if (!task)
61a28784 2616 goto out_no_task;
28a6d671
EB		 2617
2618 ret = 0;
28a6d671
EB		 2619 i = filp->f_pos;
2620 switch (i) {
2621 case 0:
2622 ino = inode->i_ino;
2623 if (filldir(dirent, ".", 1, i, ino, DT_DIR) < 0)
2624 goto out;
2625 i++;
2626 filp->f_pos++;
2627 /* fall through */
2628 case 1:
2629 ino = parent_ino(dentry);
2630 if (filldir(dirent, "..", 2, i, ino, DT_DIR) < 0)
2631 goto out;
2632 i++;
2633 filp->f_pos++;
2634 /* fall through */
2635 default:
2636 i -= 2;
2637 if (i >= nents) {
2638 ret = 1;
2639 goto out;
2640 }
2641 p = ents + i;
7bcd6b0e
EB		 2642 last = &ents[nents - 1];
2643 while (p <= last) {
61a28784 2644 if (proc_pident_fill_cache(filp, dirent, filldir, task, p) < 0)
28a6d671
EB		 2645 goto out;
2646 filp->f_pos++;
2647 p++;
2648 }
2649 }
2650
2651 ret = 1;
2652out:
61a28784
EB		 2653 put_task_struct(task);
2654out_no_task:
28a6d671 2655 return ret;
1da177e4
LT		 2656}
2657
28a6d671
EB		 2658#ifdef CONFIG_SECURITY
2659static ssize_t proc_pid_attr_read(struct file * file, char __user * buf,
2660 size_t count, loff_t *ppos)
2661{
2fddfeef 2662 struct inode * inode = file->f_path.dentry->d_inode;
04ff9708 2663 char *p = NULL;
28a6d671
EB		 2664 ssize_t length;
2665 struct task_struct *task = get_proc_task(inode);
2666
28a6d671 2667 if (!task)
04ff9708 2668 return -ESRCH;
28a6d671
EB		 2669
2670 length = security_getprocattr(task,
2fddfeef 2671 (char*)file->f_path.dentry->d_name.name,
04ff9708 2672 &p);
28a6d671 2673 put_task_struct(task);
04ff9708
AV		 2674 if (length > 0)
2675 length = simple_read_from_buffer(buf, count, ppos, p, length);
2676 kfree(p);
28a6d671 2677 return length;
1da177e4
LT		 2678}
2679
28a6d671
EB		 2680static ssize_t proc_pid_attr_write(struct file * file, const char __user * buf,
2681 size_t count, loff_t *ppos)
2682{
2fddfeef 2683 struct inode * inode = file->f_path.dentry->d_inode;
28a6d671
EB		 2684 char *page;
2685 ssize_t length;
2686 struct task_struct *task = get_proc_task(inode);
2687
2688 length = -ESRCH;
2689 if (!task)
2690 goto out_no_task;
2691 if (count > PAGE_SIZE)
2692 count = PAGE_SIZE;
2693
2694 /* No partial writes. */
2695 length = -EINVAL;
2696 if (*ppos != 0)
2697 goto out;
2698
2699 length = -ENOMEM;
e12ba74d 2700 page = (char*)__get_free_page(GFP_TEMPORARY);
28a6d671
EB		 2701 if (!page)
2702 goto out;
2703
2704 length = -EFAULT;
2705 if (copy_from_user(page, buf, count))
2706 goto out_free;
2707
107db7c7 2708 /* Guard against adverse ptrace interaction */
9b1bf12d 2709 length = mutex_lock_interruptible(&task->signal->cred_guard_mutex);
107db7c7
DH		 2710 if (length < 0)
2711 goto out_free;
2712
28a6d671 2713 length = security_setprocattr(task,
2fddfeef 2714 (char*)file->f_path.dentry->d_name.name,
28a6d671 2715 (void*)page, count);
9b1bf12d 2716 mutex_unlock(&task->signal->cred_guard_mutex);
28a6d671
EB		 2717out_free:
2718 free_page((unsigned long) page);
2719out:
2720 put_task_struct(task);
2721out_no_task:
2722 return length;
2723}
2724
00977a59 2725static const struct file_operations proc_pid_attr_operations = {
28a6d671
EB		 2726 .read = proc_pid_attr_read,
2727 .write = proc_pid_attr_write,
87df8424 2728 .llseek = generic_file_llseek,
28a6d671
EB		 2729};
2730
c5141e6d 2731static const struct pid_entry attr_dir_stuff[] = {
631f9c18
AD		 2732 REG("current", S_IRUGO|S_IWUGO, proc_pid_attr_operations),
2733 REG("prev", S_IRUGO, proc_pid_attr_operations),
2734 REG("exec", S_IRUGO|S_IWUGO, proc_pid_attr_operations),
2735 REG("fscreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations),
2736 REG("keycreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations),
2737 REG("sockcreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations),
28a6d671
EB		 2738};
2739
72d9dcfc 2740static int proc_attr_dir_readdir(struct file * filp,
28a6d671
EB		 2741 void * dirent, filldir_t filldir)
2742{
2743 return proc_pident_readdir(filp,dirent,filldir,
72d9dcfc 2744 attr_dir_stuff,ARRAY_SIZE(attr_dir_stuff));
28a6d671
EB		 2745}
2746
00977a59 2747static const struct file_operations proc_attr_dir_operations = {
1da177e4 2748 .read = generic_read_dir,
72d9dcfc 2749 .readdir = proc_attr_dir_readdir,
6038f373 2750 .llseek = default_llseek,
1da177e4
LT		 2751};
2752
72d9dcfc 2753static struct dentry *proc_attr_dir_lookup(struct inode *dir,
28a6d671
EB		 2754 struct dentry *dentry, struct nameidata *nd)
2755{
7bcd6b0e
EB		 2756 return proc_pident_lookup(dir, dentry,
2757 attr_dir_stuff, ARRAY_SIZE(attr_dir_stuff));
28a6d671
EB		 2758}
2759
c5ef1c42 2760static const struct inode_operations proc_attr_dir_inode_operations = {
72d9dcfc 2761 .lookup = proc_attr_dir_lookup,
99f89551 2762 .getattr = pid_getattr,
6d76fa58 2763 .setattr = proc_setattr,
1da177e4
LT		 2764};
2765
28a6d671
EB		 2766#endif
2767
698ba7b5 2768#ifdef CONFIG_ELF_CORE
3cb4a0bb
KH		 2769static ssize_t proc_coredump_filter_read(struct file *file, char __user *buf,
2770 size_t count, loff_t *ppos)
2771{
2772 struct task_struct *task = get_proc_task(file->f_dentry->d_inode);
2773 struct mm_struct *mm;
2774 char buffer[PROC_NUMBUF];
2775 size_t len;
2776 int ret;
2777
2778 if (!task)
2779 return -ESRCH;
2780
2781 ret = 0;
2782 mm = get_task_mm(task);
2783 if (mm) {
2784 len = snprintf(buffer, sizeof(buffer), "%08lx\n",
2785 ((mm->flags & MMF_DUMP_FILTER_MASK) >>
2786 MMF_DUMP_FILTER_SHIFT));
2787 mmput(mm);
2788 ret = simple_read_from_buffer(buf, count, ppos, buffer, len);
2789 }
2790
2791 put_task_struct(task);
2792
2793 return ret;
2794}
2795
2796static ssize_t proc_coredump_filter_write(struct file *file,
2797 const char __user *buf,
2798 size_t count,
2799 loff_t *ppos)
2800{
2801 struct task_struct *task;
2802 struct mm_struct *mm;
2803 char buffer[PROC_NUMBUF], *end;
2804 unsigned int val;
2805 int ret;
2806 int i;
2807 unsigned long mask;
2808
2809 ret = -EFAULT;
2810 memset(buffer, 0, sizeof(buffer));
2811 if (count > sizeof(buffer) - 1)
2812 count = sizeof(buffer) - 1;
2813 if (copy_from_user(buffer, buf, count))
2814 goto out_no_task;
2815
2816 ret = -EINVAL;
2817 val = (unsigned int)simple_strtoul(buffer, &end, 0);
2818 if (*end == '\n')
2819 end++;
2820 if (end - buffer == 0)
2821 goto out_no_task;
2822
2823 ret = -ESRCH;
2824 task = get_proc_task(file->f_dentry->d_inode);
2825 if (!task)
2826 goto out_no_task;
2827
2828 ret = end - buffer;
2829 mm = get_task_mm(task);
2830 if (!mm)
2831 goto out_no_mm;
2832
2833 for (i = 0, mask = 1; i < MMF_DUMP_FILTER_BITS; i++, mask <<= 1) {
2834 if (val & mask)
2835 set_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags);
2836 else
2837 clear_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags);
2838 }
2839
2840 mmput(mm);
2841 out_no_mm:
2842 put_task_struct(task);
2843 out_no_task:
2844 return ret;
2845}
2846
2847static const struct file_operations proc_coredump_filter_operations = {
2848 .read = proc_coredump_filter_read,
2849 .write = proc_coredump_filter_write,
87df8424 2850 .llseek = generic_file_llseek,
3cb4a0bb
KH		 2851};
2852#endif
2853
28a6d671
EB		 2854/*
2855 * /proc/self:
2856 */
2857static int proc_self_readlink(struct dentry *dentry, char __user *buffer,
2858 int buflen)
2859{
488e5bc4 2860 struct pid_namespace *ns = dentry->d_sb->s_fs_info;
b55fcb22 2861 pid_t tgid = task_tgid_nr_ns(current, ns);
28a6d671 2862 char tmp[PROC_NUMBUF];
b55fcb22 2863 if (!tgid)
488e5bc4 2864 return -ENOENT;
b55fcb22 2865 sprintf(tmp, "%d", tgid);
28a6d671
EB		 2866 return vfs_readlink(dentry,buffer,buflen,tmp);
2867}
2868
2869static void *proc_self_follow_link(struct dentry *dentry, struct nameidata *nd)
2870{
488e5bc4 2871 struct pid_namespace *ns = dentry->d_sb->s_fs_info;
b55fcb22 2872 pid_t tgid = task_tgid_nr_ns(current, ns);
7fee4868
AV		 2873 char *name = ERR_PTR(-ENOENT);
2874 if (tgid) {
2875 name = __getname();
2876 if (!name)
2877 name = ERR_PTR(-ENOMEM);
2878 else
2879 sprintf(name, "%d", tgid);
2880 }
2881 nd_set_link(nd, name);
2882 return NULL;
2883}
2884
2885static void proc_self_put_link(struct dentry *dentry, struct nameidata *nd,
2886 void *cookie)
2887{
2888 char *s = nd_get_link(nd);
2889 if (!IS_ERR(s))
2890 __putname(s);
28a6d671
EB		 2891}
2892
c5ef1c42 2893static const struct inode_operations proc_self_inode_operations = {
28a6d671
EB		 2894 .readlink = proc_self_readlink,
2895 .follow_link = proc_self_follow_link,
7fee4868 2896 .put_link = proc_self_put_link,
28a6d671
EB		 2897};
2898
801199ce
EB		 2899/*
2900 * proc base
2901 *
2902 * These are the directory entries in the root directory of /proc
2903 * that properly belong to the /proc filesystem, as they describe
2904 * describe something that is process related.
2905 */
c5141e6d 2906static const struct pid_entry proc_base_stuff[] = {
61a28784 2907 NOD("self", S_IFLNK|S_IRWXUGO,
801199ce 2908 &proc_self_inode_operations, NULL, {}),
801199ce
EB		 2909};
2910
444ceed8 2911static struct dentry *proc_base_instantiate(struct inode *dir,
c5141e6d 2912 struct dentry *dentry, struct task_struct *task, const void *ptr)
801199ce 2913{
c5141e6d 2914 const struct pid_entry *p = ptr;
801199ce 2915 struct inode *inode;
801199ce 2916 struct proc_inode *ei;
73d36460 2917 struct dentry *error;
801199ce
EB		 2918
2919 /* Allocate the inode */
2920 error = ERR_PTR(-ENOMEM);
2921 inode = new_inode(dir->i_sb);
2922 if (!inode)
2923 goto out;
2924
2925 /* Initialize the inode */
2926 ei = PROC_I(inode);
85fe4025 2927 inode->i_ino = get_next_ino();
801199ce 2928 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
801199ce
EB		 2929
2930 /*
2931 * grab the reference to the task.
2932 */
1a657f78 2933 ei->pid = get_task_pid(task, PIDTYPE_PID);
801199ce
EB		 2934 if (!ei->pid)
2935 goto out_iput;
2936
801199ce
EB		 2937 inode->i_mode = p->mode;
2938 if (S_ISDIR(inode->i_mode))
bfe86848 2939 set_nlink(inode, 2);
801199ce
EB		 2940 if (S_ISLNK(inode->i_mode))
2941 inode->i_size = 64;
2942 if (p->iop)
2943 inode->i_op = p->iop;
2944 if (p->fop)
2945 inode->i_fop = p->fop;
2946 ei->op = p->op;
801199ce
EB		 2947 d_add(dentry, inode);
2948 error = NULL;
2949out:
801199ce
EB		 2950 return error;
2951out_iput:
2952 iput(inode);
2953 goto out;
2954}
2955
444ceed8
EB		 2956static struct dentry *proc_base_lookup(struct inode *dir, struct dentry *dentry)
2957{
2958 struct dentry *error;
2959 struct task_struct *task = get_proc_task(dir);
c5141e6d 2960 const struct pid_entry *p, *last;
444ceed8
EB		 2961
2962 error = ERR_PTR(-ENOENT);
2963
2964 if (!task)
2965 goto out_no_task;
2966
2967 /* Lookup the directory entry */
7bcd6b0e
EB		 2968 last = &proc_base_stuff[ARRAY_SIZE(proc_base_stuff) - 1];
2969 for (p = proc_base_stuff; p <= last; p++) {
444ceed8
EB		 2970 if (p->len != dentry->d_name.len)
2971 continue;
2972 if (!memcmp(dentry->d_name.name, p->name, p->len))
2973 break;
2974 }
7bcd6b0e 2975 if (p > last)
444ceed8
EB		 2976 goto out;
2977
2978 error = proc_base_instantiate(dir, dentry, task, p);
2979
2980out:
2981 put_task_struct(task);
2982out_no_task:
2983 return error;
2984}
2985
c5141e6d
ED		 2986static int proc_base_fill_cache(struct file *filp, void *dirent,
2987 filldir_t filldir, struct task_struct *task, const struct pid_entry *p)
61a28784
EB		 2988{
2989 return proc_fill_cache(filp, dirent, filldir, p->name, p->len,
2990 proc_base_instantiate, task, p);
2991}
2992
aba76fdb 2993#ifdef CONFIG_TASK_IO_ACCOUNTING
297c5d92
AR		 2994static int do_io_accounting(struct task_struct *task, char *buffer, int whole)
2995{
940389b8 2996 struct task_io_accounting acct = task->ioac;
5995477a 2997 unsigned long flags;
293eb1e7 2998 int result;
5995477a 2999
293eb1e7
VK		 3000 result = mutex_lock_killable(&task->signal->cred_guard_mutex);
3001 if (result)
3002 return result;
3003
3004 if (!ptrace_may_access(task, PTRACE_MODE_READ)) {
3005 result = -EACCES;
3006 goto out_unlock;
3007 }
1d1221f3 3008
5995477a
AR		 3009 if (whole && lock_task_sighand(task, &flags)) {
3010 struct task_struct *t = task;
3011
3012 task_io_accounting_add(&acct, &task->signal->ioac);
3013 while_each_thread(task, t)
3014 task_io_accounting_add(&acct, &t->ioac);
3015
3016 unlock_task_sighand(task, &flags);
297c5d92 3017 }
293eb1e7 3018 result = sprintf(buffer,
aba76fdb
AM		 3019 "rchar: %llu\n"
3020 "wchar: %llu\n"
3021 "syscr: %llu\n"
3022 "syscw: %llu\n"
3023 "read_bytes: %llu\n"
3024 "write_bytes: %llu\n"
3025 "cancelled_write_bytes: %llu\n",
7c44319d
AB		 3026 (unsigned long long)acct.rchar,
3027 (unsigned long long)acct.wchar,
3028 (unsigned long long)acct.syscr,
3029 (unsigned long long)acct.syscw,
3030 (unsigned long long)acct.read_bytes,
3031 (unsigned long long)acct.write_bytes,
3032 (unsigned long long)acct.cancelled_write_bytes);
293eb1e7
VK		 3033out_unlock:
3034 mutex_unlock(&task->signal->cred_guard_mutex);
3035 return result;
297c5d92
AR		 3036}
3037
3038static int proc_tid_io_accounting(struct task_struct *task, char *buffer)
3039{
3040 return do_io_accounting(task, buffer, 0);
aba76fdb 3041}
297c5d92
AR		 3042
3043static int proc_tgid_io_accounting(struct task_struct *task, char *buffer)
3044{
3045 return do_io_accounting(task, buffer, 1);
3046}
3047#endif /* CONFIG_TASK_IO_ACCOUNTING */
aba76fdb 3048
47830723
KC		 3049static int proc_pid_personality(struct seq_file *m, struct pid_namespace *ns,
3050 struct pid *pid, struct task_struct *task)
3051{
a9712bc1
AV		 3052 int err = lock_trace(task);
3053 if (!err) {
3054 seq_printf(m, "%08x\n", task->personality);
3055 unlock_trace(task);
3056 }
3057 return err;
47830723
KC		 3058}
3059
28a6d671
EB		 3060/*
3061 * Thread groups
3062 */
00977a59 3063static const struct file_operations proc_task_operations;
c5ef1c42 3064static const struct inode_operations proc_task_inode_operations;
20cdc894 3065
c5141e6d 3066static const struct pid_entry tgid_base_stuff[] = {
631f9c18
AD		 3067 DIR("task", S_IRUGO|S_IXUGO, proc_task_inode_operations, proc_task_operations),
3068 DIR("fd", S_IRUSR|S_IXUSR, proc_fd_inode_operations, proc_fd_operations),
640708a2
PE		 3069#ifdef CONFIG_CHECKPOINT_RESTORE
3070 DIR("map_files", S_IRUSR|S_IXUSR, proc_map_files_inode_operations, proc_map_files_operations),
3071#endif
631f9c18 3072 DIR("fdinfo", S_IRUSR|S_IXUSR, proc_fdinfo_inode_operations, proc_fdinfo_operations),
6b4e306a 3073 DIR("ns", S_IRUSR|S_IXUGO, proc_ns_dir_inode_operations, proc_ns_dir_operations),
b2211a36 3074#ifdef CONFIG_NET
631f9c18 3075 DIR("net", S_IRUGO|S_IXUGO, proc_net_inode_operations, proc_net_operations),
b2211a36 3076#endif
631f9c18
AD		 3077 REG("environ", S_IRUSR, proc_environ_operations),
3078 INF("auxv", S_IRUSR, proc_pid_auxv),
3079 ONE("status", S_IRUGO, proc_pid_status),
a9712bc1 3080 ONE("personality", S_IRUGO, proc_pid_personality),
3036e7b4 3081 INF("limits", S_IRUGO, proc_pid_limits),
43ae34cb 3082#ifdef CONFIG_SCHED_DEBUG
631f9c18 3083 REG("sched", S_IRUGO|S_IWUSR, proc_pid_sched_operations),
5091faa4
MG		 3084#endif
3085#ifdef CONFIG_SCHED_AUTOGROUP
3086 REG("autogroup", S_IRUGO|S_IWUSR, proc_pid_sched_autogroup_operations),
ebcb6734 3087#endif
4614a696 3088 REG("comm", S_IRUGO|S_IWUSR, proc_pid_set_comm_operations),
ebcb6734 3089#ifdef CONFIG_HAVE_ARCH_TRACEHOOK
a9712bc1 3090 INF("syscall", S_IRUGO, proc_pid_syscall),
43ae34cb 3091#endif
631f9c18
AD		 3092 INF("cmdline", S_IRUGO, proc_pid_cmdline),
3093 ONE("stat", S_IRUGO, proc_tgid_stat),
3094 ONE("statm", S_IRUGO, proc_pid_statm),
3095 REG("maps", S_IRUGO, proc_maps_operations),
28a6d671 3096#ifdef CONFIG_NUMA
631f9c18 3097 REG("numa_maps", S_IRUGO, proc_numa_maps_operations),
28a6d671 3098#endif
631f9c18
AD		 3099 REG("mem", S_IRUSR|S_IWUSR, proc_mem_operations),
3100 LNK("cwd", proc_cwd_link),
3101 LNK("root", proc_root_link),
3102 LNK("exe", proc_exe_link),
3103 REG("mounts", S_IRUGO, proc_mounts_operations),
3104 REG("mountinfo", S_IRUGO, proc_mountinfo_operations),
3105 REG("mountstats", S_IRUSR, proc_mountstats_operations),
1e883281 3106#ifdef CONFIG_PROC_PAGE_MONITOR
631f9c18
AD		 3107 REG("clear_refs", S_IWUSR, proc_clear_refs_operations),
3108 REG("smaps", S_IRUGO, proc_smaps_operations),
ca6b0bf0 3109 REG("pagemap", S_IRUGO, proc_pagemap_operations),
28a6d671
EB		 3110#endif
3111#ifdef CONFIG_SECURITY
631f9c18 3112 DIR("attr", S_IRUGO|S_IXUGO, proc_attr_dir_inode_operations, proc_attr_dir_operations),
28a6d671
EB		 3113#endif
3114#ifdef CONFIG_KALLSYMS
631f9c18 3115 INF("wchan", S_IRUGO, proc_pid_wchan),
28a6d671 3116#endif
2ec220e2 3117#ifdef CONFIG_STACKTRACE
a9712bc1 3118 ONE("stack", S_IRUGO, proc_pid_stack),
28a6d671
EB		 3119#endif
3120#ifdef CONFIG_SCHEDSTATS
631f9c18 3121 INF("schedstat", S_IRUGO, proc_pid_schedstat),
28a6d671 3122#endif
9745512c 3123#ifdef CONFIG_LATENCYTOP
631f9c18 3124 REG("latency", S_IRUGO, proc_lstats_operations),
9745512c 3125#endif
8793d854 3126#ifdef CONFIG_PROC_PID_CPUSET
631f9c18 3127 REG("cpuset", S_IRUGO, proc_cpuset_operations),
a424316c
PM		 3128#endif
3129#ifdef CONFIG_CGROUPS
631f9c18 3130 REG("cgroup", S_IRUGO, proc_cgroup_operations),
28a6d671 3131#endif
631f9c18
AD		 3132 INF("oom_score", S_IRUGO, proc_oom_score),
3133 REG("oom_adj", S_IRUGO|S_IWUSR, proc_oom_adjust_operations),
a63d83f4 3134 REG("oom_score_adj", S_IRUGO|S_IWUSR, proc_oom_score_adj_operations),
28a6d671 3135#ifdef CONFIG_AUDITSYSCALL
631f9c18
AD		 3136 REG("loginuid", S_IWUSR|S_IRUGO, proc_loginuid_operations),
3137 REG("sessionid", S_IRUGO, proc_sessionid_operations),
28a6d671 3138#endif
f4f154fd 3139#ifdef CONFIG_FAULT_INJECTION
631f9c18 3140 REG("make-it-fail", S_IRUGO|S_IWUSR, proc_fault_inject_operations),
f4f154fd 3141#endif
698ba7b5 3142#ifdef CONFIG_ELF_CORE
631f9c18 3143 REG("coredump_filter", S_IRUGO|S_IWUSR, proc_coredump_filter_operations),
3cb4a0bb 3144#endif
aba76fdb 3145#ifdef CONFIG_TASK_IO_ACCOUNTING
1d1221f3 3146 INF("io", S_IRUSR, proc_tgid_io_accounting),
aba76fdb 3147#endif
f133ecca
CM		 3148#ifdef CONFIG_HARDWALL
3149 INF("hardwall", S_IRUGO, proc_pid_hardwall),
3150#endif
28a6d671 3151};
1da177e4 3152
28a6d671 3153static int proc_tgid_base_readdir(struct file * filp,
1da177e4
LT		 3154 void * dirent, filldir_t filldir)
3155{
3156 return proc_pident_readdir(filp,dirent,filldir,
28a6d671 3157 tgid_base_stuff,ARRAY_SIZE(tgid_base_stuff));
1da177e4
LT		 3158}
3159
00977a59 3160static const struct file_operations proc_tgid_base_operations = {
1da177e4 3161 .read = generic_read_dir,
28a6d671 3162 .readdir = proc_tgid_base_readdir,
6038f373 3163 .llseek = default_llseek,
1da177e4
LT		 3164};
3165
28a6d671 3166static struct dentry *proc_tgid_base_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd){
7bcd6b0e
EB		 3167 return proc_pident_lookup(dir, dentry,
3168 tgid_base_stuff, ARRAY_SIZE(tgid_base_stuff));
1da177e4
LT		 3169}
3170
c5ef1c42 3171static const struct inode_operations proc_tgid_base_inode_operations = {
28a6d671 3172 .lookup = proc_tgid_base_lookup,
99f89551 3173 .getattr = pid_getattr,
6d76fa58 3174 .setattr = proc_setattr,
0499680a 3175 .permission = proc_pid_permission,
1da177e4 3176};
1da177e4 3177
60347f67 3178static void proc_flush_task_mnt(struct vfsmount *mnt, pid_t pid, pid_t tgid)
1da177e4 3179{
48e6484d 3180 struct dentry *dentry, *leader, *dir;
8578cea7 3181 char buf[PROC_NUMBUF];
48e6484d
EB		 3182 struct qstr name;
3183
3184 name.name = buf;
60347f67
PE		 3185 name.len = snprintf(buf, sizeof(buf), "%d", pid);
3186 dentry = d_hash_and_lookup(mnt->mnt_root, &name);
48e6484d 3187 if (dentry) {
29f12ca3 3188 shrink_dcache_parent(dentry);
48e6484d
EB		 3189 d_drop(dentry);
3190 dput(dentry);
3191 }
1da177e4 3192
48e6484d 3193 name.name = buf;
60347f67
PE		 3194 name.len = snprintf(buf, sizeof(buf), "%d", tgid);
3195 leader = d_hash_and_lookup(mnt->mnt_root, &name);
48e6484d
EB		 3196 if (!leader)
3197 goto out;
1da177e4 3198
48e6484d
EB		 3199 name.name = "task";
3200 name.len = strlen(name.name);
3201 dir = d_hash_and_lookup(leader, &name);
3202 if (!dir)
3203 goto out_put_leader;
3204
3205 name.name = buf;
60347f67 3206 name.len = snprintf(buf, sizeof(buf), "%d", pid);
48e6484d
EB		 3207 dentry = d_hash_and_lookup(dir, &name);
3208 if (dentry) {
3209 shrink_dcache_parent(dentry);
3210 d_drop(dentry);
3211 dput(dentry);
1da177e4 3212 }
48e6484d
EB		 3213
3214 dput(dir);
3215out_put_leader:
3216 dput(leader);
3217out:
3218 return;
1da177e4
LT		 3219}
3220
0895e91d
RD		 3221/**
3222 * proc_flush_task - Remove dcache entries for @task from the /proc dcache.
3223 * @task: task that should be flushed.
3224 *
3225 * When flushing dentries from proc, one needs to flush them from global
60347f67 3226 * proc (proc_mnt) and from all the namespaces' procs this task was seen
0895e91d
RD		 3227 * in. This call is supposed to do all of this job.
3228 *
3229 * Looks in the dcache for
3230 * /proc/@pid
3231 * /proc/@tgid/task/@pid
3232 * if either directory is present flushes it and all of it'ts children
3233 * from the dcache.
3234 *
3235 * It is safe and reasonable to cache /proc entries for a task until
3236 * that task exits. After that they just clog up the dcache with
3237 * useless entries, possibly causing useful dcache entries to be
3238 * flushed instead. This routine is proved to flush those useless
3239 * dcache entries at process exit time.
3240 *
3241 * NOTE: This routine is just an optimization so it does not guarantee
3242 * that no dcache entries will exist at process exit time it
3243 * just makes it very unlikely that any will persist.
60347f67
PE		 3244 */
3245
3246void proc_flush_task(struct task_struct *task)
3247{
9fcc2d15 3248 int i;
9b4d1cbe 3249 struct pid *pid, *tgid;
130f77ec
PE		 3250 struct upid *upid;
3251
130f77ec 3252 pid = task_pid(task);
9b4d1cbe 3253 tgid = task_tgid(task);
130f77ec 3254
9fcc2d15 3255 for (i = 0; i <= pid->level; i++) {
130f77ec
PE		 3256 upid = &pid->numbers[i];
3257 proc_flush_task_mnt(upid->ns->proc_mnt, upid->nr,
9b4d1cbe 3258 tgid->numbers[i].nr);
130f77ec 3259 }
6f4e6433
PE		 3260
3261 upid = &pid->numbers[pid->level];
3262 if (upid->nr == 1)
3263 pid_ns_release_proc(upid->ns);
60347f67
PE		 3264}
3265
9711ef99
AB		 3266static struct dentry *proc_pid_instantiate(struct inode *dir,
3267 struct dentry * dentry,
c5141e6d 3268 struct task_struct *task, const void *ptr)
444ceed8
EB		 3269{
3270 struct dentry *error = ERR_PTR(-ENOENT);
3271 struct inode *inode;
3272
61a28784 3273 inode = proc_pid_make_inode(dir->i_sb, task);
444ceed8
EB		 3274 if (!inode)
3275 goto out;
3276
3277 inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO;
3278 inode->i_op = &proc_tgid_base_inode_operations;
3279 inode->i_fop = &proc_tgid_base_operations;
3280 inode->i_flags|=S_IMMUTABLE;
aed54175 3281
bfe86848
MS		 3282 set_nlink(inode, 2 + pid_entry_count_dirs(tgid_base_stuff,
3283 ARRAY_SIZE(tgid_base_stuff)));
444ceed8 3284
fb045adb 3285 d_set_d_op(dentry, &pid_dentry_operations);
444ceed8
EB		 3286
3287 d_add(dentry, inode);
3288 /* Close the race of the process dying before we return the dentry */
3289 if (pid_revalidate(dentry, NULL))
3290 error = NULL;
3291out:
3292 return error;
3293}
3294
1da177e4
LT		 3295struct dentry *proc_pid_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd)
3296{
73d36460 3297 struct dentry *result;
1da177e4 3298 struct task_struct *task;
1da177e4 3299 unsigned tgid;
b488893a 3300 struct pid_namespace *ns;
1da177e4 3301
801199ce
EB		 3302 result = proc_base_lookup(dir, dentry);
3303 if (!IS_ERR(result) || PTR_ERR(result) != -ENOENT)
3304 goto out;
3305
1da177e4
LT		 3306 tgid = name_to_int(dentry);
3307 if (tgid == ~0U)
3308 goto out;
3309
b488893a 3310 ns = dentry->d_sb->s_fs_info;
de758734 3311 rcu_read_lock();
b488893a 3312 task = find_task_by_pid_ns(tgid, ns);
1da177e4
LT		 3313 if (task)
3314 get_task_struct(task);
de758734 3315 rcu_read_unlock();
1da177e4
LT		 3316 if (!task)
3317 goto out;
3318
444ceed8 3319 result = proc_pid_instantiate(dir, dentry, task, NULL);
1da177e4 3320 put_task_struct(task);
1da177e4 3321out:
cd6a3ce9 3322 return result;
1da177e4
LT		 3323}
3324
1da177e4 3325/*
0804ef4b 3326 * Find the first task with tgid >= tgid
0bc58a91 3327 *
1da177e4 3328 */
19fd4bb2
EB		 3329struct tgid_iter {
3330 unsigned int tgid;
0804ef4b 3331 struct task_struct *task;
19fd4bb2
EB		 3332};
3333static struct tgid_iter next_tgid(struct pid_namespace *ns, struct tgid_iter iter)
3334{
0804ef4b 3335 struct pid *pid;
1da177e4 3336
19fd4bb2
EB		 3337 if (iter.task)
3338 put_task_struct(iter.task);
454cc105 3339 rcu_read_lock();
0804ef4b 3340retry:
19fd4bb2
EB		 3341 iter.task = NULL;
3342 pid = find_ge_pid(iter.tgid, ns);
0804ef4b 3343 if (pid) {
19fd4bb2
EB		 3344 iter.tgid = pid_nr_ns(pid, ns);
3345 iter.task = pid_task(pid, PIDTYPE_PID);
0804ef4b
EB		 3346 /* What we to know is if the pid we have find is the
3347 * pid of a thread_group_leader. Testing for task
3348 * being a thread_group_leader is the obvious thing
3349 * todo but there is a window when it fails, due to
3350 * the pid transfer logic in de_thread.
3351 *
3352 * So we perform the straight forward test of seeing
3353 * if the pid we have found is the pid of a thread
3354 * group leader, and don't worry if the task we have
3355 * found doesn't happen to be a thread group leader.
3356 * As we don't care in the case of readdir.
3357 */
19fd4bb2
EB		 3358 if (!iter.task || !has_group_leader_pid(iter.task)) {
3359 iter.tgid += 1;
0804ef4b 3360 goto retry;
19fd4bb2
EB		 3361 }
3362 get_task_struct(iter.task);
0bc58a91 3363 }
454cc105 3364 rcu_read_unlock();
19fd4bb2 3365 return iter;
1da177e4
LT		 3366}
3367
7bcd6b0e 3368#define TGID_OFFSET (FIRST_PROCESS_ENTRY + ARRAY_SIZE(proc_base_stuff))
0804ef4b 3369
61a28784 3370static int proc_pid_fill_cache(struct file *filp, void *dirent, filldir_t filldir,
19fd4bb2 3371 struct tgid_iter iter)
61a28784
EB		 3372{
3373 char name[PROC_NUMBUF];
19fd4bb2 3374 int len = snprintf(name, sizeof(name), "%d", iter.tgid);
61a28784 3375 return proc_fill_cache(filp, dirent, filldir, name, len,
19fd4bb2 3376 proc_pid_instantiate, iter.task, NULL);
61a28784
EB		 3377}
3378
0499680a
VK		 3379static int fake_filldir(void *buf, const char *name, int namelen,
3380 loff_t offset, u64 ino, unsigned d_type)
3381{
3382 return 0;
3383}
3384
1da177e4
LT		 3385/* for the /proc/ directory itself, after non-process stuff has been done */
3386int proc_pid_readdir(struct file * filp, void * dirent, filldir_t filldir)
3387{
d8bdc59f
LT		 3388 unsigned int nr;
3389 struct task_struct *reaper;
19fd4bb2 3390 struct tgid_iter iter;
b488893a 3391 struct pid_namespace *ns;
0499680a 3392 filldir_t __filldir;
1da177e4 3393
d8bdc59f
LT		 3394 if (filp->f_pos >= PID_MAX_LIMIT + TGID_OFFSET)
3395 goto out_no_task;
3396 nr = filp->f_pos - FIRST_PROCESS_ENTRY;
3397
3398 reaper = get_proc_task(filp->f_path.dentry->d_inode);
61a28784
EB		 3399 if (!reaper)
3400 goto out_no_task;
3401
7bcd6b0e 3402 for (; nr < ARRAY_SIZE(proc_base_stuff); filp->f_pos++, nr++) {
c5141e6d 3403 const struct pid_entry *p = &proc_base_stuff[nr];
61a28784 3404 if (proc_base_fill_cache(filp, dirent, filldir, reaper, p) < 0)
801199ce 3405 goto out;
1da177e4
LT		 3406 }
3407
b488893a 3408 ns = filp->f_dentry->d_sb->s_fs_info;
19fd4bb2
EB		 3409 iter.task = NULL;
3410 iter.tgid = filp->f_pos - TGID_OFFSET;
3411 for (iter = next_tgid(ns, iter);
3412 iter.task;
3413 iter.tgid += 1, iter = next_tgid(ns, iter)) {
0499680a
VK		 3414 if (has_pid_permissions(ns, iter.task, 2))
3415 __filldir = filldir;
3416 else
3417 __filldir = fake_filldir;
3418
19fd4bb2 3419 filp->f_pos = iter.tgid + TGID_OFFSET;
0499680a 3420 if (proc_pid_fill_cache(filp, dirent, __filldir, iter) < 0) {
19fd4bb2 3421 put_task_struct(iter.task);
0804ef4b 3422 goto out;
1da177e4 3423 }
0bc58a91 3424 }
0804ef4b
EB		 3425 filp->f_pos = PID_MAX_LIMIT + TGID_OFFSET;
3426out:
61a28784
EB		 3427 put_task_struct(reaper);
3428out_no_task:
0bc58a91
EB		 3429 return 0;
3430}
1da177e4 3431
28a6d671
EB		 3432/*
3433 * Tasks
3434 */
c5141e6d 3435static const struct pid_entry tid_base_stuff[] = {
631f9c18 3436 DIR("fd", S_IRUSR|S_IXUSR, proc_fd_inode_operations, proc_fd_operations),
3835541d 3437 DIR("fdinfo", S_IRUSR|S_IXUSR, proc_fdinfo_inode_operations, proc_fdinfo_operations),
6b4e306a 3438 DIR("ns", S_IRUSR|S_IXUGO, proc_ns_dir_inode_operations, proc_ns_dir_operations),
631f9c18
AD		 3439 REG("environ", S_IRUSR, proc_environ_operations),
3440 INF("auxv", S_IRUSR, proc_pid_auxv),
3441 ONE("status", S_IRUGO, proc_pid_status),
a9712bc1 3442 ONE("personality", S_IRUGO, proc_pid_personality),
3036e7b4 3443 INF("limits", S_IRUGO, proc_pid_limits),
43ae34cb 3444#ifdef CONFIG_SCHED_DEBUG
631f9c18 3445 REG("sched", S_IRUGO|S_IWUSR, proc_pid_sched_operations),
ebcb6734 3446#endif
4614a696 3447 REG("comm", S_IRUGO|S_IWUSR, proc_pid_set_comm_operations),
ebcb6734 3448#ifdef CONFIG_HAVE_ARCH_TRACEHOOK
a9712bc1 3449 INF("syscall", S_IRUGO, proc_pid_syscall),
43ae34cb 3450#endif
631f9c18
AD		 3451 INF("cmdline", S_IRUGO, proc_pid_cmdline),
3452 ONE("stat", S_IRUGO, proc_tid_stat),
3453 ONE("statm", S_IRUGO, proc_pid_statm),
3454 REG("maps", S_IRUGO, proc_maps_operations),
28a6d671 3455#ifdef CONFIG_NUMA
631f9c18 3456 REG("numa_maps", S_IRUGO, proc_numa_maps_operations),
28a6d671 3457#endif
631f9c18
AD		 3458 REG("mem", S_IRUSR|S_IWUSR, proc_mem_operations),
3459 LNK("cwd", proc_cwd_link),
3460 LNK("root", proc_root_link),
3461 LNK("exe", proc_exe_link),
3462 REG("mounts", S_IRUGO, proc_mounts_operations),
3463 REG("mountinfo", S_IRUGO, proc_mountinfo_operations),
1e883281 3464#ifdef CONFIG_PROC_PAGE_MONITOR
631f9c18
AD		 3465 REG("clear_refs", S_IWUSR, proc_clear_refs_operations),
3466 REG("smaps", S_IRUGO, proc_smaps_operations),
ca6b0bf0 3467 REG("pagemap", S_IRUGO, proc_pagemap_operations),
28a6d671
EB		 3468#endif
3469#ifdef CONFIG_SECURITY
631f9c18 3470 DIR("attr", S_IRUGO|S_IXUGO, proc_attr_dir_inode_operations, proc_attr_dir_operations),
28a6d671
EB		 3471#endif
3472#ifdef CONFIG_KALLSYMS
631f9c18 3473 INF("wchan", S_IRUGO, proc_pid_wchan),
28a6d671 3474#endif
2ec220e2 3475#ifdef CONFIG_STACKTRACE
a9712bc1 3476 ONE("stack", S_IRUGO, proc_pid_stack),
28a6d671
EB		 3477#endif
3478#ifdef CONFIG_SCHEDSTATS
631f9c18 3479 INF("schedstat", S_IRUGO, proc_pid_schedstat),
28a6d671 3480#endif
9745512c 3481#ifdef CONFIG_LATENCYTOP
631f9c18 3482 REG("latency", S_IRUGO, proc_lstats_operations),
9745512c 3483#endif
8793d854 3484#ifdef CONFIG_PROC_PID_CPUSET
631f9c18 3485 REG("cpuset", S_IRUGO, proc_cpuset_operations),
a424316c
PM		 3486#endif
3487#ifdef CONFIG_CGROUPS
631f9c18 3488 REG("cgroup", S_IRUGO, proc_cgroup_operations),
28a6d671 3489#endif
631f9c18
AD		 3490 INF("oom_score", S_IRUGO, proc_oom_score),
3491 REG("oom_adj", S_IRUGO|S_IWUSR, proc_oom_adjust_operations),
a63d83f4 3492 REG("oom_score_adj", S_IRUGO|S_IWUSR, proc_oom_score_adj_operations),
28a6d671 3493#ifdef CONFIG_AUDITSYSCALL
631f9c18 3494 REG("loginuid", S_IWUSR|S_IRUGO, proc_loginuid_operations),
26ec3c64 3495 REG("sessionid", S_IRUGO, proc_sessionid_operations),
28a6d671 3496#endif
f4f154fd 3497#ifdef CONFIG_FAULT_INJECTION
631f9c18 3498 REG("make-it-fail", S_IRUGO|S_IWUSR, proc_fault_inject_operations),
f4f154fd 3499#endif
297c5d92 3500#ifdef CONFIG_TASK_IO_ACCOUNTING
1d1221f3 3501 INF("io", S_IRUSR, proc_tid_io_accounting),
297c5d92 3502#endif
f133ecca
CM		 3503#ifdef CONFIG_HARDWALL
3504 INF("hardwall", S_IRUGO, proc_pid_hardwall),
3505#endif
28a6d671
EB		 3506};
3507
3508static int proc_tid_base_readdir(struct file * filp,
3509 void * dirent, filldir_t filldir)
3510{
3511 return proc_pident_readdir(filp,dirent,filldir,
3512 tid_base_stuff,ARRAY_SIZE(tid_base_stuff));
3513}
3514
3515static struct dentry *proc_tid_base_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd){
7bcd6b0e
EB		 3516 return proc_pident_lookup(dir, dentry,
3517 tid_base_stuff, ARRAY_SIZE(tid_base_stuff));
28a6d671
EB		 3518}
3519
00977a59 3520static const struct file_operations proc_tid_base_operations = {
28a6d671
EB		 3521 .read = generic_read_dir,
3522 .readdir = proc_tid_base_readdir,
6038f373 3523 .llseek = default_llseek,
28a6d671
EB		 3524};
3525
c5ef1c42 3526static const struct inode_operations proc_tid_base_inode_operations = {
28a6d671
EB		 3527 .lookup = proc_tid_base_lookup,
3528 .getattr = pid_getattr,
3529 .setattr = proc_setattr,
3530};
3531
444ceed8 3532static struct dentry *proc_task_instantiate(struct inode *dir,
c5141e6d 3533 struct dentry *dentry, struct task_struct *task, const void *ptr)
444ceed8
EB		 3534{
3535 struct dentry *error = ERR_PTR(-ENOENT);
3536 struct inode *inode;
61a28784 3537 inode = proc_pid_make_inode(dir->i_sb, task);
444ceed8
EB		 3538
3539 if (!inode)
3540 goto out;
3541 inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO;
3542 inode->i_op = &proc_tid_base_inode_operations;
3543 inode->i_fop = &proc_tid_base_operations;
3544 inode->i_flags|=S_IMMUTABLE;
aed54175 3545
bfe86848
MS		 3546 set_nlink(inode, 2 + pid_entry_count_dirs(tid_base_stuff,
3547 ARRAY_SIZE(tid_base_stuff)));
444ceed8 3548
fb045adb 3549 d_set_d_op(dentry, &pid_dentry_operations);
444ceed8
EB		 3550
3551 d_add(dentry, inode);
3552 /* Close the race of the process dying before we return the dentry */
3553 if (pid_revalidate(dentry, NULL))
3554 error = NULL;
3555out:
3556 return error;
3557}
3558
28a6d671
EB		 3559static struct dentry *proc_task_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd)
3560{
3561 struct dentry *result = ERR_PTR(-ENOENT);
3562 struct task_struct *task;
3563 struct task_struct *leader = get_proc_task(dir);
28a6d671 3564 unsigned tid;
b488893a 3565 struct pid_namespace *ns;
28a6d671
EB		 3566
3567 if (!leader)
3568 goto out_no_task;
3569
3570 tid = name_to_int(dentry);
3571 if (tid == ~0U)
3572 goto out;
3573
b488893a 3574 ns = dentry->d_sb->s_fs_info;
28a6d671 3575 rcu_read_lock();
b488893a 3576 task = find_task_by_pid_ns(tid, ns);
28a6d671
EB		 3577 if (task)
3578 get_task_struct(task);
3579 rcu_read_unlock();
3580 if (!task)
3581 goto out;
bac0abd6 3582 if (!same_thread_group(leader, task))
28a6d671
EB		 3583 goto out_drop_task;
3584
444ceed8 3585 result = proc_task_instantiate(dir, dentry, task, NULL);
28a6d671
EB		 3586out_drop_task:
3587 put_task_struct(task);
3588out:
3589 put_task_struct(leader);
3590out_no_task:
3591 return result;
3592}
3593
0bc58a91
EB		 3594/*
3595 * Find the first tid of a thread group to return to user space.
3596 *
3597 * Usually this is just the thread group leader, but if the users
3598 * buffer was too small or there was a seek into the middle of the
3599 * directory we have more work todo.
3600 *
3601 * In the case of a short read we start with find_task_by_pid.
3602 *
3603 * In the case of a seek we start with the leader and walk nr
3604 * threads past it.
3605 */
cc288738 3606static struct task_struct *first_tid(struct task_struct *leader,
b488893a 3607 int tid, int nr, struct pid_namespace *ns)
0bc58a91 3608{
a872ff0c 3609 struct task_struct *pos;
1da177e4 3610
cc288738 3611 rcu_read_lock();
0bc58a91
EB		 3612 /* Attempt to start with the pid of a thread */
3613 if (tid && (nr > 0)) {
b488893a 3614 pos = find_task_by_pid_ns(tid, ns);
a872ff0c
ON		 3615 if (pos && (pos->group_leader == leader))
3616 goto found;
0bc58a91 3617 }
1da177e4 3618
0bc58a91 3619 /* If nr exceeds the number of threads there is nothing todo */
a872ff0c
ON		 3620 pos = NULL;
3621 if (nr && nr >= get_nr_threads(leader))
3622 goto out;
1da177e4 3623
a872ff0c
ON		 3624 /* If we haven't found our starting place yet start
3625 * with the leader and walk nr threads forward.
0bc58a91 3626 */
a872ff0c
ON		 3627 for (pos = leader; nr > 0; --nr) {
3628 pos = next_thread(pos);
3629 if (pos == leader) {
3630 pos = NULL;
3631 goto out;
3632 }
1da177e4 3633 }
a872ff0c
ON		 3634found:
3635 get_task_struct(pos);
3636out:
cc288738 3637 rcu_read_unlock();
0bc58a91
EB		 3638 return pos;
3639}
3640
3641/*
3642 * Find the next thread in the thread list.
3643 * Return NULL if there is an error or no next thread.
3644 *
3645 * The reference to the input task_struct is released.
3646 */
3647static struct task_struct *next_tid(struct task_struct *start)
3648{
c1df7fb8 3649 struct task_struct *pos = NULL;
cc288738 3650 rcu_read_lock();
c1df7fb8 3651 if (pid_alive(start)) {
0bc58a91 3652 pos = next_thread(start);
c1df7fb8
ON		 3653 if (thread_group_leader(pos))
3654 pos = NULL;
3655 else
3656 get_task_struct(pos);
3657 }
cc288738 3658 rcu_read_unlock();
0bc58a91
EB		 3659 put_task_struct(start);
3660 return pos;
1da177e4
LT		 3661}
3662
61a28784
EB		 3663static int proc_task_fill_cache(struct file *filp, void *dirent, filldir_t filldir,
3664 struct task_struct *task, int tid)
3665{
3666 char name[PROC_NUMBUF];
3667 int len = snprintf(name, sizeof(name), "%d", tid);
3668 return proc_fill_cache(filp, dirent, filldir, name, len,
3669 proc_task_instantiate, task, NULL);
3670}
3671
1da177e4
LT		 3672/* for the /proc/TGID/task/ directories */
3673static int proc_task_readdir(struct file * filp, void * dirent, filldir_t filldir)
3674{
2fddfeef 3675 struct dentry *dentry = filp->f_path.dentry;
1da177e4 3676 struct inode *inode = dentry->d_inode;
7d895244 3677 struct task_struct *leader = NULL;
0bc58a91 3678 struct task_struct *task;
1da177e4
LT		 3679 int retval = -ENOENT;
3680 ino_t ino;
0bc58a91 3681 int tid;
b488893a 3682 struct pid_namespace *ns;
1da177e4 3683
7d895244
GC		 3684 task = get_proc_task(inode);
3685 if (!task)
3686 goto out_no_task;
3687 rcu_read_lock();
3688 if (pid_alive(task)) {
3689 leader = task->group_leader;
3690 get_task_struct(leader);
3691 }
3692 rcu_read_unlock();
3693 put_task_struct(task);
99f89551
EB		 3694 if (!leader)
3695 goto out_no_task;
1da177e4
LT		 3696 retval = 0;
3697
ee568b25 3698 switch ((unsigned long)filp->f_pos) {
1da177e4
LT		 3699 case 0:
3700 ino = inode->i_ino;
ee6f779b 3701 if (filldir(dirent, ".", 1, filp->f_pos, ino, DT_DIR) < 0)
1da177e4 3702 goto out;
ee6f779b 3703 filp->f_pos++;
1da177e4
LT		 3704 /* fall through */
3705 case 1:
3706 ino = parent_ino(dentry);
ee6f779b 3707 if (filldir(dirent, "..", 2, filp->f_pos, ino, DT_DIR) < 0)
1da177e4 3708 goto out;
ee6f779b 3709 filp->f_pos++;
1da177e4
LT		 3710 /* fall through */
3711 }
3712
0bc58a91
EB		 3713 /* f_version caches the tgid value that the last readdir call couldn't
3714 * return. lseek aka telldir automagically resets f_version to 0.
3715 */
b488893a 3716 ns = filp->f_dentry->d_sb->s_fs_info;
2b47c361 3717 tid = (int)filp->f_version;
0bc58a91 3718 filp->f_version = 0;
ee6f779b 3719 for (task = first_tid(leader, tid, filp->f_pos - 2, ns);
0bc58a91 3720 task;
ee6f779b 3721 task = next_tid(task), filp->f_pos++) {
b488893a 3722 tid = task_pid_nr_ns(task, ns);
61a28784 3723 if (proc_task_fill_cache(filp, dirent, filldir, task, tid) < 0) {
0bc58a91
EB		 3724 /* returning this tgid failed, save it as the first
3725 * pid for the next readir call */
2b47c361 3726 filp->f_version = (u64)tid;
0bc58a91 3727 put_task_struct(task);
1da177e4 3728 break;
0bc58a91 3729 }
1da177e4
LT		 3730 }
3731out:
99f89551
EB		 3732 put_task_struct(leader);
3733out_no_task:
1da177e4
LT		 3734 return retval;
3735}
6e66b52b
EB		 3736
3737static int proc_task_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
3738{
3739 struct inode *inode = dentry->d_inode;
99f89551 3740 struct task_struct *p = get_proc_task(inode);
6e66b52b
EB		 3741 generic_fillattr(inode, stat);
3742
99f89551 3743 if (p) {
99f89551 3744 stat->nlink += get_nr_threads(p);
99f89551 3745 put_task_struct(p);
6e66b52b
EB		 3746 }
3747
3748 return 0;
3749}
28a6d671 3750
c5ef1c42 3751static const struct inode_operations proc_task_inode_operations = {
28a6d671
EB		 3752 .lookup = proc_task_lookup,
3753 .getattr = proc_task_getattr,
3754 .setattr = proc_setattr,
0499680a 3755 .permission = proc_pid_permission,
28a6d671
EB		 3756};
3757
00977a59 3758static const struct file_operations proc_task_operations = {
28a6d671
EB		 3759 .read = generic_read_dir,
3760 .readdir = proc_task_readdir,
6038f373 3761 .llseek = default_llseek,
28a6d671 3762};
Linux kernel - Deliverables
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