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[deliverable/linux.git] / fs / proc / base.c
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1da177e4
LT		 1/*
2 * linux/fs/proc/base.c
3 *
4 * Copyright (C) 1991, 1992 Linus Torvalds
5 *
6 * proc base directory handling functions
7 *
8 * 1999, Al Viro. Rewritten. Now it covers the whole per-process part.
9 * Instead of using magical inumbers to determine the kind of object
10 * we allocate and fill in-core inodes upon lookup. They don't even
11 * go into icache. We cache the reference to task_struct upon lookup too.
12 * Eventually it should become a filesystem in its own. We don't use the
13 * rest of procfs anymore.
e070ad49
ML		 14 *
15 *
16 * Changelog:
17 * 17-Jan-2005
18 * Allan Bezerra
19 * Bruna Moreira <bruna.moreira@indt.org.br>
20 * Edjard Mota <edjard.mota@indt.org.br>
21 * Ilias Biris <ilias.biris@indt.org.br>
22 * Mauricio Lin <mauricio.lin@indt.org.br>
23 *
24 * Embedded Linux Lab - 10LE Instituto Nokia de Tecnologia - INdT
25 *
26 * A new process specific entry (smaps) included in /proc. It shows the
27 * size of rss for each memory area. The maps entry lacks information
28 * about physical memory size (rss) for each mapped file, i.e.,
29 * rss information for executables and library files.
30 * This additional information is useful for any tools that need to know
31 * about physical memory consumption for a process specific library.
32 *
33 * Changelog:
34 * 21-Feb-2005
35 * Embedded Linux Lab - 10LE Instituto Nokia de Tecnologia - INdT
36 * Pud inclusion in the page table walking.
37 *
38 * ChangeLog:
39 * 10-Mar-2005
40 * 10LE Instituto Nokia de Tecnologia - INdT:
41 * A better way to walks through the page table as suggested by Hugh Dickins.
42 *
43 * Simo Piiroinen <simo.piiroinen@nokia.com>:
44 * Smaps information related to shared, private, clean and dirty pages.
45 *
46 * Paul Mundt <paul.mundt@nokia.com>:
47 * Overall revision about smaps.
1da177e4
LT		 48 */
49
50#include <asm/uaccess.h>
51
1da177e4
LT		 52#include <linux/errno.h>
53#include <linux/time.h>
54#include <linux/proc_fs.h>
55#include <linux/stat.h>
5995477a 56#include <linux/task_io_accounting_ops.h>
1da177e4 57#include <linux/init.h>
16f7e0fe 58#include <linux/capability.h>
1da177e4 59#include <linux/file.h>
9f3acc31 60#include <linux/fdtable.h>
1da177e4
LT		 61#include <linux/string.h>
62#include <linux/seq_file.h>
63#include <linux/namei.h>
6b3286ed 64#include <linux/mnt_namespace.h>
1da177e4 65#include <linux/mm.h>
a63d83f4 66#include <linux/swap.h>
b835996f 67#include <linux/rcupdate.h>
1da177e4 68#include <linux/kallsyms.h>
2ec220e2 69#include <linux/stacktrace.h>
d85f50d5 70#include <linux/resource.h>
5096add8 71#include <linux/module.h>
1da177e4
LT		 72#include <linux/mount.h>
73#include <linux/security.h>
74#include <linux/ptrace.h>
0d094efe 75#include <linux/tracehook.h>
a424316c 76#include <linux/cgroup.h>
1da177e4
LT		 77#include <linux/cpuset.h>
78#include <linux/audit.h>
5addc5dd 79#include <linux/poll.h>
1651e14e 80#include <linux/nsproxy.h>
8ac773b4 81#include <linux/oom.h>
3cb4a0bb 82#include <linux/elf.h>
60347f67 83#include <linux/pid_namespace.h>
22d917d8 84#include <linux/user_namespace.h>
5ad4e53b 85#include <linux/fs_struct.h>
5a0e3ad6 86#include <linux/slab.h>
640708a2 87#include <linux/flex_array.h>
f133ecca
CM		 88#ifdef CONFIG_HARDWALL
89#include <asm/hardwall.h>
90#endif
43d2b113 91#include <trace/events/oom.h>
1da177e4
LT		 92#include "internal.h"
93
0f2fe20f
EB		 94/* NOTE:
95 * Implementing inode permission operations in /proc is almost
96 * certainly an error. Permission checks need to happen during
97 * each system call not at open time. The reason is that most of
98 * what we wish to check for permissions in /proc varies at runtime.
99 *
100 * The classic example of a problem is opening file descriptors
101 * in /proc for a task before it execs a suid executable.
102 */
103
1da177e4 104struct pid_entry {
1da177e4 105 char *name;
c5141e6d 106 int len;
d161a13f 107 umode_t mode;
c5ef1c42 108 const struct inode_operations *iop;
00977a59 109 const struct file_operations *fop;
20cdc894 110 union proc_op op;
1da177e4
LT		 111};
112
61a28784 113#define NOD(NAME, MODE, IOP, FOP, OP) { \
20cdc894 114 .name = (NAME), \
c5141e6d 115 .len = sizeof(NAME) - 1, \
20cdc894
EB		 116 .mode = MODE, \
117 .iop = IOP, \
118 .fop = FOP, \
119 .op = OP, \
120}
121
631f9c18
AD		 122#define DIR(NAME, MODE, iops, fops) \
123 NOD(NAME, (S_IFDIR|(MODE)), &iops, &fops, {} )
124#define LNK(NAME, get_link) \
61a28784 125 NOD(NAME, (S_IFLNK|S_IRWXUGO), \
20cdc894 126 &proc_pid_link_inode_operations, NULL, \
631f9c18
AD		 127 { .proc_get_link = get_link } )
128#define REG(NAME, MODE, fops) \
129 NOD(NAME, (S_IFREG|(MODE)), NULL, &fops, {})
130#define INF(NAME, MODE, read) \
61a28784 131 NOD(NAME, (S_IFREG|(MODE)), \
20cdc894 132 NULL, &proc_info_file_operations, \
631f9c18
AD		 133 { .proc_read = read } )
134#define ONE(NAME, MODE, show) \
be614086
EB		 135 NOD(NAME, (S_IFREG|(MODE)), \
136 NULL, &proc_single_file_operations, \
631f9c18 137 { .proc_show = show } )
1da177e4 138
640708a2
PE		 139static int proc_fd_permission(struct inode *inode, int mask);
140
aed54175
VN		 141/*
142 * Count the number of hardlinks for the pid_entry table, excluding the .
143 * and .. links.
144 */
145static unsigned int pid_entry_count_dirs(const struct pid_entry *entries,
146 unsigned int n)
147{
148 unsigned int i;
149 unsigned int count;
150
151 count = 0;
152 for (i = 0; i < n; ++i) {
153 if (S_ISDIR(entries[i].mode))
154 ++count;
155 }
156
157 return count;
158}
159
f7ad3c6b 160static int get_task_root(struct task_struct *task, struct path *root)
1da177e4 161{
7c2c7d99
HD		 162 int result = -ENOENT;
163
0494f6ec 164 task_lock(task);
f7ad3c6b
MS		 165 if (task->fs) {
166 get_fs_root(task->fs, root);
7c2c7d99
HD		 167 result = 0;
168 }
0494f6ec 169 task_unlock(task);
7c2c7d99 170 return result;
0494f6ec
MS		 171}
172
7773fbc5 173static int proc_cwd_link(struct dentry *dentry, struct path *path)
0494f6ec 174{
7773fbc5 175 struct task_struct *task = get_proc_task(dentry->d_inode);
0494f6ec 176 int result = -ENOENT;
99f89551
EB		 177
178 if (task) {
f7ad3c6b
MS		 179 task_lock(task);
180 if (task->fs) {
181 get_fs_pwd(task->fs, path);
182 result = 0;
183 }
184 task_unlock(task);
99f89551
EB		 185 put_task_struct(task);
186 }
1da177e4
LT		 187 return result;
188}
189
7773fbc5 190static int proc_root_link(struct dentry *dentry, struct path *path)
1da177e4 191{
7773fbc5 192 struct task_struct *task = get_proc_task(dentry->d_inode);
1da177e4 193 int result = -ENOENT;
99f89551
EB		 194
195 if (task) {
f7ad3c6b 196 result = get_task_root(task, path);
99f89551
EB		 197 put_task_struct(task);
198 }
1da177e4
LT		 199 return result;
200}
201
e268337d
LT		 202struct mm_struct *mm_for_maps(struct task_struct *task)
203{
204 return mm_access(task, PTRACE_MODE_READ);
205}
206
1da177e4
LT		 207static int proc_pid_cmdline(struct task_struct *task, char * buffer)
208{
209 int res = 0;
210 unsigned int len;
211 struct mm_struct *mm = get_task_mm(task);
212 if (!mm)
213 goto out;
214 if (!mm->arg_end)
215 goto out_mm; /* Shh! No looking before we're done */
216
217 len = mm->arg_end - mm->arg_start;
218
219 if (len > PAGE_SIZE)
220 len = PAGE_SIZE;
221
222 res = access_process_vm(task, mm->arg_start, buffer, len, 0);
223
224 // If the nul at the end of args has been overwritten, then
225 // assume application is using setproctitle(3).
226 if (res > 0 && buffer[res-1] != '\0' && len < PAGE_SIZE) {
227 len = strnlen(buffer, res);
228 if (len < res) {
229 res = len;
230 } else {
231 len = mm->env_end - mm->env_start;
232 if (len > PAGE_SIZE - res)
233 len = PAGE_SIZE - res;
234 res += access_process_vm(task, mm->env_start, buffer+res, len, 0);
235 res = strnlen(buffer, res);
236 }
237 }
238out_mm:
239 mmput(mm);
240out:
241 return res;
242}
243
244static int proc_pid_auxv(struct task_struct *task, char *buffer)
245{
2fadaef4
AV		 246 struct mm_struct *mm = mm_for_maps(task);
247 int res = PTR_ERR(mm);
248 if (mm && !IS_ERR(mm)) {
1da177e4 249 unsigned int nwords = 0;
dfe6b7d9 250 do {
1da177e4 251 nwords += 2;
dfe6b7d9 252 } while (mm->saved_auxv[nwords - 2] != 0); /* AT_NULL */
1da177e4
LT		 253 res = nwords * sizeof(mm->saved_auxv[0]);
254 if (res > PAGE_SIZE)
255 res = PAGE_SIZE;
256 memcpy(buffer, mm->saved_auxv, res);
257 mmput(mm);
258 }
259 return res;
260}
261
262
263#ifdef CONFIG_KALLSYMS
264/*
265 * Provides a wchan file via kallsyms in a proper one-value-per-file format.
266 * Returns the resolved symbol. If that fails, simply return the address.
267 */
268static int proc_pid_wchan(struct task_struct *task, char *buffer)
269{
ffb45122 270 unsigned long wchan;
9281acea 271 char symname[KSYM_NAME_LEN];
1da177e4
LT		 272
273 wchan = get_wchan(task);
274
9d65cb4a 275 if (lookup_symbol_name(wchan, symname) < 0)
f83ce3e6
JE		 276 if (!ptrace_may_access(task, PTRACE_MODE_READ))
277 return 0;
278 else
279 return sprintf(buffer, "%lu", wchan);
9d65cb4a
AD		 280 else
281 return sprintf(buffer, "%s", symname);
1da177e4
LT		 282}
283#endif /* CONFIG_KALLSYMS */
284
a9712bc1
AV		 285static int lock_trace(struct task_struct *task)
286{
287 int err = mutex_lock_killable(&task->signal->cred_guard_mutex);
288 if (err)
289 return err;
290 if (!ptrace_may_access(task, PTRACE_MODE_ATTACH)) {
291 mutex_unlock(&task->signal->cred_guard_mutex);
292 return -EPERM;
293 }
294 return 0;
295}
296
297static void unlock_trace(struct task_struct *task)
298{
299 mutex_unlock(&task->signal->cred_guard_mutex);
300}
301
2ec220e2
KC		 302#ifdef CONFIG_STACKTRACE
303
304#define MAX_STACK_TRACE_DEPTH 64
305
306static int proc_pid_stack(struct seq_file *m, struct pid_namespace *ns,
307 struct pid *pid, struct task_struct *task)
308{
309 struct stack_trace trace;
310 unsigned long *entries;
a9712bc1 311 int err;
2ec220e2
KC		 312 int i;
313
314 entries = kmalloc(MAX_STACK_TRACE_DEPTH * sizeof(*entries), GFP_KERNEL);
315 if (!entries)
316 return -ENOMEM;
317
318 trace.nr_entries = 0;
319 trace.max_entries = MAX_STACK_TRACE_DEPTH;
320 trace.entries = entries;
321 trace.skip = 0;
2ec220e2 322
a9712bc1
AV		 323 err = lock_trace(task);
324 if (!err) {
325 save_stack_trace_tsk(task, &trace);
326
327 for (i = 0; i < trace.nr_entries; i++) {
b81a618d 328 seq_printf(m, "[<%pK>] %pS\n",
a9712bc1
AV		 329 (void *)entries[i], (void *)entries[i]);
330 }
331 unlock_trace(task);
2ec220e2
KC		 332 }
333 kfree(entries);
334
a9712bc1 335 return err;
2ec220e2
KC		 336}
337#endif
338
1da177e4
LT		 339#ifdef CONFIG_SCHEDSTATS
340/*
341 * Provides /proc/PID/schedstat
342 */
343static int proc_pid_schedstat(struct task_struct *task, char *buffer)
344{
172ba844 345 return sprintf(buffer, "%llu %llu %lu\n",
826e08b0
IM		 346 (unsigned long long)task->se.sum_exec_runtime,
347 (unsigned long long)task->sched_info.run_delay,
2d72376b 348 task->sched_info.pcount);
1da177e4
LT		 349}
350#endif
351
9745512c
AV		 352#ifdef CONFIG_LATENCYTOP
353static int lstats_show_proc(struct seq_file *m, void *v)
354{
355 int i;
13d77c37
HS		 356 struct inode *inode = m->private;
357 struct task_struct *task = get_proc_task(inode);
9745512c 358
13d77c37
HS		 359 if (!task)
360 return -ESRCH;
361 seq_puts(m, "Latency Top version : v0.1\n");
9745512c 362 for (i = 0; i < 32; i++) {
34e49d4f
JP		 363 struct latency_record *lr = &task->latency_record[i];
364 if (lr->backtrace[0]) {
9745512c 365 int q;
34e49d4f
JP		 366 seq_printf(m, "%i %li %li",
367 lr->count, lr->time, lr->max);
9745512c 368 for (q = 0; q < LT_BACKTRACEDEPTH; q++) {
34e49d4f
JP		 369 unsigned long bt = lr->backtrace[q];
370 if (!bt)
9745512c 371 break;
34e49d4f 372 if (bt == ULONG_MAX)
9745512c 373 break;
34e49d4f 374 seq_printf(m, " %ps", (void *)bt);
9745512c 375 }
9d6de12f 376 seq_putc(m, '\n');
9745512c
AV		 377 }
378
379 }
13d77c37 380 put_task_struct(task);
9745512c
AV		 381 return 0;
382}
383
384static int lstats_open(struct inode *inode, struct file *file)
385{
13d77c37 386 return single_open(file, lstats_show_proc, inode);
d6643d12
HS		 387}
388
9745512c
AV		 389static ssize_t lstats_write(struct file *file, const char __user *buf,
390 size_t count, loff_t *offs)
391{
13d77c37 392 struct task_struct *task = get_proc_task(file->f_dentry->d_inode);
9745512c 393
13d77c37
HS		 394 if (!task)
395 return -ESRCH;
9745512c 396 clear_all_latency_tracing(task);
13d77c37 397 put_task_struct(task);
9745512c
AV		 398
399 return count;
400}
401
402static const struct file_operations proc_lstats_operations = {
403 .open = lstats_open,
404 .read = seq_read,
405 .write = lstats_write,
406 .llseek = seq_lseek,
13d77c37 407 .release = single_release,
9745512c
AV		 408};
409
410#endif
411
1da177e4
LT		 412static int proc_oom_score(struct task_struct *task, char *buffer)
413{
b95c35e7 414 unsigned long points = 0;
1da177e4 415
19c5d45a 416 read_lock(&tasklist_lock);
b95c35e7 417 if (pid_alive(task))
a63d83f4
DR		 418 points = oom_badness(task, NULL, NULL,
419 totalram_pages + total_swap_pages);
19c5d45a 420 read_unlock(&tasklist_lock);
1da177e4
LT		 421 return sprintf(buffer, "%lu\n", points);
422}
423
d85f50d5
NH		 424struct limit_names {
425 char *name;
426 char *unit;
427};
428
429static const struct limit_names lnames[RLIM_NLIMITS] = {
cff4edb5 430 [RLIMIT_CPU] = {"Max cpu time", "seconds"},
d85f50d5
NH		 431 [RLIMIT_FSIZE] = {"Max file size", "bytes"},
432 [RLIMIT_DATA] = {"Max data size", "bytes"},
433 [RLIMIT_STACK] = {"Max stack size", "bytes"},
434 [RLIMIT_CORE] = {"Max core file size", "bytes"},
435 [RLIMIT_RSS] = {"Max resident set", "bytes"},
436 [RLIMIT_NPROC] = {"Max processes", "processes"},
437 [RLIMIT_NOFILE] = {"Max open files", "files"},
438 [RLIMIT_MEMLOCK] = {"Max locked memory", "bytes"},
439 [RLIMIT_AS] = {"Max address space", "bytes"},
440 [RLIMIT_LOCKS] = {"Max file locks", "locks"},
441 [RLIMIT_SIGPENDING] = {"Max pending signals", "signals"},
442 [RLIMIT_MSGQUEUE] = {"Max msgqueue size", "bytes"},
443 [RLIMIT_NICE] = {"Max nice priority", NULL},
444 [RLIMIT_RTPRIO] = {"Max realtime priority", NULL},
8808117c 445 [RLIMIT_RTTIME] = {"Max realtime timeout", "us"},
d85f50d5
NH		 446};
447
448/* Display limits for a process */
449static int proc_pid_limits(struct task_struct *task, char *buffer)
450{
451 unsigned int i;
452 int count = 0;
453 unsigned long flags;
454 char *bufptr = buffer;
455
456 struct rlimit rlim[RLIM_NLIMITS];
457
a6bebbc8 458 if (!lock_task_sighand(task, &flags))
d85f50d5 459 return 0;
d85f50d5
NH		 460 memcpy(rlim, task->signal->rlim, sizeof(struct rlimit) * RLIM_NLIMITS);
461 unlock_task_sighand(task, &flags);
d85f50d5
NH		 462
463 /*
464 * print the file header
465 */
466 count += sprintf(&bufptr[count], "%-25s %-20s %-20s %-10s\n",
467 "Limit", "Soft Limit", "Hard Limit", "Units");
468
469 for (i = 0; i < RLIM_NLIMITS; i++) {
470 if (rlim[i].rlim_cur == RLIM_INFINITY)
471 count += sprintf(&bufptr[count], "%-25s %-20s ",
472 lnames[i].name, "unlimited");
473 else
474 count += sprintf(&bufptr[count], "%-25s %-20lu ",
475 lnames[i].name, rlim[i].rlim_cur);
476
477 if (rlim[i].rlim_max == RLIM_INFINITY)
478 count += sprintf(&bufptr[count], "%-20s ", "unlimited");
479 else
480 count += sprintf(&bufptr[count], "%-20lu ",
481 rlim[i].rlim_max);
482
483 if (lnames[i].unit)
484 count += sprintf(&bufptr[count], "%-10s\n",
485 lnames[i].unit);
486 else
487 count += sprintf(&bufptr[count], "\n");
488 }
489
490 return count;
491}
492
ebcb6734
RM		 493#ifdef CONFIG_HAVE_ARCH_TRACEHOOK
494static int proc_pid_syscall(struct task_struct *task, char *buffer)
495{
496 long nr;
497 unsigned long args[6], sp, pc;
a9712bc1
AV		 498 int res = lock_trace(task);
499 if (res)
500 return res;
ebcb6734
RM		 501
502 if (task_current_syscall(task, &nr, args, 6, &sp, &pc))
a9712bc1
AV		 503 res = sprintf(buffer, "running\n");
504 else if (nr < 0)
505 res = sprintf(buffer, "%ld 0x%lx 0x%lx\n", nr, sp, pc);
506 else
507 res = sprintf(buffer,
ebcb6734
RM		 508 "%ld 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx\n",
509 nr,
510 args[0], args[1], args[2], args[3], args[4], args[5],
511 sp, pc);
a9712bc1
AV		 512 unlock_trace(task);
513 return res;
ebcb6734
RM		 514}
515#endif /* CONFIG_HAVE_ARCH_TRACEHOOK */
516
1da177e4
LT		 517/************************************************************************/
518/* Here the fs part begins */
519/************************************************************************/
520
521/* permission checks */
778c1144 522static int proc_fd_access_allowed(struct inode *inode)
1da177e4 523{
778c1144
EB		 524 struct task_struct *task;
525 int allowed = 0;
df26c40e
EB		 526 /* Allow access to a task's file descriptors if it is us or we
527 * may use ptrace attach to the process and find out that
528 * information.
778c1144
EB		 529 */
530 task = get_proc_task(inode);
df26c40e 531 if (task) {
006ebb40 532 allowed = ptrace_may_access(task, PTRACE_MODE_READ);
778c1144 533 put_task_struct(task);
df26c40e 534 }
778c1144 535 return allowed;
1da177e4
LT		 536}
537
6b4e306a 538int proc_setattr(struct dentry *dentry, struct iattr *attr)
6d76fa58
LT		 539{
540 int error;
541 struct inode *inode = dentry->d_inode;
542
543 if (attr->ia_valid & ATTR_MODE)
544 return -EPERM;
545
546 error = inode_change_ok(inode, attr);
1025774c
CH		 547 if (error)
548 return error;
549
550 if ((attr->ia_valid & ATTR_SIZE) &&
551 attr->ia_size != i_size_read(inode)) {
552 error = vmtruncate(inode, attr->ia_size);
553 if (error)
554 return error;
555 }
556
557 setattr_copy(inode, attr);
558 mark_inode_dirty(inode);
559 return 0;
6d76fa58
LT		 560}
561
0499680a
VK		 562/*
563 * May current process learn task's sched/cmdline info (for hide_pid_min=1)
564 * or euid/egid (for hide_pid_min=2)?
565 */
566static bool has_pid_permissions(struct pid_namespace *pid,
567 struct task_struct *task,
568 int hide_pid_min)
569{
570 if (pid->hide_pid < hide_pid_min)
571 return true;
572 if (in_group_p(pid->pid_gid))
573 return true;
574 return ptrace_may_access(task, PTRACE_MODE_READ);
575}
576
577
578static int proc_pid_permission(struct inode *inode, int mask)
579{
580 struct pid_namespace *pid = inode->i_sb->s_fs_info;
581 struct task_struct *task;
582 bool has_perms;
583
584 task = get_proc_task(inode);
a2ef990a
XF		 585 if (!task)
586 return -ESRCH;
0499680a
VK		 587 has_perms = has_pid_permissions(pid, task, 1);
588 put_task_struct(task);
589
590 if (!has_perms) {
591 if (pid->hide_pid == 2) {
592 /*
593 * Let's make getdents(), stat(), and open()
594 * consistent with each other. If a process
595 * may not stat() a file, it shouldn't be seen
596 * in procfs at all.
597 */
598 return -ENOENT;
599 }
600
601 return -EPERM;
602 }
603 return generic_permission(inode, mask);
604}
605
606
607
c5ef1c42 608static const struct inode_operations proc_def_inode_operations = {
6d76fa58
LT		 609 .setattr = proc_setattr,
610};
611
1da177e4
LT		 612#define PROC_BLOCK_SIZE (3*1024) /* 4K page size but our output routines use some slack for overruns */
613
614static ssize_t proc_info_read(struct file * file, char __user * buf,
615 size_t count, loff_t *ppos)
616{
2fddfeef 617 struct inode * inode = file->f_path.dentry->d_inode;
1da177e4
LT		 618 unsigned long page;
619 ssize_t length;
99f89551
EB		 620 struct task_struct *task = get_proc_task(inode);
621
622 length = -ESRCH;
623 if (!task)
624 goto out_no_task;
1da177e4
LT		 625
626 if (count > PROC_BLOCK_SIZE)
627 count = PROC_BLOCK_SIZE;
99f89551
EB		 628
629 length = -ENOMEM;
e12ba74d 630 if (!(page = __get_free_page(GFP_TEMPORARY)))
99f89551 631 goto out;
1da177e4
LT		 632
633 length = PROC_I(inode)->op.proc_read(task, (char*)page);
634
635 if (length >= 0)
636 length = simple_read_from_buffer(buf, count, ppos, (char *)page, length);
637 free_page(page);
99f89551
EB		 638out:
639 put_task_struct(task);
640out_no_task:
1da177e4
LT		 641 return length;
642}
643
00977a59 644static const struct file_operations proc_info_file_operations = {
1da177e4 645 .read = proc_info_read,
87df8424 646 .llseek = generic_file_llseek,
1da177e4
LT		 647};
648
be614086
EB		 649static int proc_single_show(struct seq_file *m, void *v)
650{
651 struct inode *inode = m->private;
652 struct pid_namespace *ns;
653 struct pid *pid;
654 struct task_struct *task;
655 int ret;
656
657 ns = inode->i_sb->s_fs_info;
658 pid = proc_pid(inode);
659 task = get_pid_task(pid, PIDTYPE_PID);
660 if (!task)
661 return -ESRCH;
662
663 ret = PROC_I(inode)->op.proc_show(m, ns, pid, task);
664
665 put_task_struct(task);
666 return ret;
667}
668
669static int proc_single_open(struct inode *inode, struct file *filp)
670{
c6a34058 671 return single_open(filp, proc_single_show, inode);
be614086
EB		 672}
673
674static const struct file_operations proc_single_file_operations = {
675 .open = proc_single_open,
676 .read = seq_read,
677 .llseek = seq_lseek,
678 .release = single_release,
679};
680
1da177e4
LT		 681static int mem_open(struct inode* inode, struct file* file)
682{
e268337d
LT		 683 struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode);
684 struct mm_struct *mm;
685
686 if (!task)
687 return -ESRCH;
688
689 mm = mm_access(task, PTRACE_MODE_ATTACH);
690 put_task_struct(task);
691
692 if (IS_ERR(mm))
693 return PTR_ERR(mm);
694
6d08f2c7
ON		 695 if (mm) {
696 /* ensure this mm_struct can't be freed */
697 atomic_inc(&mm->mm_count);
698 /* but do not pin its memory */
699 mmput(mm);
700 }
701
4a3956c7
KH		 702 /* OK to pass negative loff_t, we can catch out-of-range */
703 file->f_mode |= FMODE_UNSIGNED_OFFSET;
e268337d
LT		 704 file->private_data = mm;
705
1da177e4
LT		 706 return 0;
707}
708
572d34b9
ON		 709static ssize_t mem_rw(struct file *file, char __user *buf,
710 size_t count, loff_t *ppos, int write)
1da177e4 711{
e268337d 712 struct mm_struct *mm = file->private_data;
572d34b9
ON		 713 unsigned long addr = *ppos;
714 ssize_t copied;
1da177e4 715 char *page;
1da177e4 716
e268337d
LT		 717 if (!mm)
718 return 0;
99f89551 719
30cd8903
KM		 720 page = (char *)__get_free_page(GFP_TEMPORARY);
721 if (!page)
e268337d 722 return -ENOMEM;
1da177e4 723
f7ca54f4 724 copied = 0;
6d08f2c7
ON		 725 if (!atomic_inc_not_zero(&mm->mm_users))
726 goto free;
727
1da177e4 728 while (count > 0) {
572d34b9 729 int this_len = min_t(int, count, PAGE_SIZE);
1da177e4 730
572d34b9 731 if (write && copy_from_user(page, buf, this_len)) {
1da177e4
LT		 732 copied = -EFAULT;
733 break;
734 }
572d34b9
ON		 735
736 this_len = access_remote_vm(mm, addr, page, this_len, write);
737 if (!this_len) {
1da177e4
LT		 738 if (!copied)
739 copied = -EIO;
740 break;
741 }
572d34b9
ON		 742
743 if (!write && copy_to_user(buf, page, this_len)) {
744 copied = -EFAULT;
745 break;
746 }
747
748 buf += this_len;
749 addr += this_len;
750 copied += this_len;
751 count -= this_len;
1da177e4 752 }
572d34b9 753 *ppos = addr;
30cd8903 754
6d08f2c7
ON		 755 mmput(mm);
756free:
30cd8903 757 free_page((unsigned long) page);
1da177e4
LT		 758 return copied;
759}
1da177e4 760
572d34b9
ON		 761static ssize_t mem_read(struct file *file, char __user *buf,
762 size_t count, loff_t *ppos)
763{
764 return mem_rw(file, buf, count, ppos, 0);
765}
766
767static ssize_t mem_write(struct file *file, const char __user *buf,
768 size_t count, loff_t *ppos)
769{
770 return mem_rw(file, (char __user*)buf, count, ppos, 1);
771}
772
85863e47 773loff_t mem_lseek(struct file *file, loff_t offset, int orig)
1da177e4
LT		 774{
775 switch (orig) {
776 case 0:
777 file->f_pos = offset;
778 break;
779 case 1:
780 file->f_pos += offset;
781 break;
782 default:
783 return -EINVAL;
784 }
785 force_successful_syscall_return();
786 return file->f_pos;
787}
788
e268337d
LT		 789static int mem_release(struct inode *inode, struct file *file)
790{
791 struct mm_struct *mm = file->private_data;
71879d3c 792 if (mm)
6d08f2c7 793 mmdrop(mm);
e268337d
LT		 794 return 0;
795}
796
00977a59 797static const struct file_operations proc_mem_operations = {
1da177e4
LT		 798 .llseek = mem_lseek,
799 .read = mem_read,
800 .write = mem_write,
801 .open = mem_open,
e268337d 802 .release = mem_release,
1da177e4
LT		 803};
804
315e28c8
JP		 805static ssize_t environ_read(struct file *file, char __user *buf,
806 size_t count, loff_t *ppos)
807{
808 struct task_struct *task = get_proc_task(file->f_dentry->d_inode);
809 char *page;
810 unsigned long src = *ppos;
811 int ret = -ESRCH;
812 struct mm_struct *mm;
813
814 if (!task)
815 goto out_no_task;
816
315e28c8
JP		 817 ret = -ENOMEM;
818 page = (char *)__get_free_page(GFP_TEMPORARY);
819 if (!page)
820 goto out;
821
315e28c8 822
d6f64b89
AV		 823 mm = mm_for_maps(task);
824 ret = PTR_ERR(mm);
825 if (!mm || IS_ERR(mm))
315e28c8
JP		 826 goto out_free;
827
d6f64b89 828 ret = 0;
315e28c8
JP		 829 while (count > 0) {
830 int this_len, retval, max_len;
831
832 this_len = mm->env_end - (mm->env_start + src);
833
834 if (this_len <= 0)
835 break;
836
837 max_len = (count > PAGE_SIZE) ? PAGE_SIZE : count;
838 this_len = (this_len > max_len) ? max_len : this_len;
839
840 retval = access_process_vm(task, (mm->env_start + src),
841 page, this_len, 0);
842
843 if (retval <= 0) {
844 ret = retval;
845 break;
846 }
847
848 if (copy_to_user(buf, page, retval)) {
849 ret = -EFAULT;
850 break;
851 }
852
853 ret += retval;
854 src += retval;
855 buf += retval;
856 count -= retval;
857 }
858 *ppos = src;
859
860 mmput(mm);
861out_free:
862 free_page((unsigned long) page);
863out:
864 put_task_struct(task);
865out_no_task:
866 return ret;
867}
868
869static const struct file_operations proc_environ_operations = {
870 .read = environ_read,
87df8424 871 .llseek = generic_file_llseek,
315e28c8
JP		 872};
873
1da177e4
LT		 874static ssize_t oom_adjust_read(struct file *file, char __user *buf,
875 size_t count, loff_t *ppos)
876{
2fddfeef 877 struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode);
8578cea7 878 char buffer[PROC_NUMBUF];
1da177e4 879 size_t len;
28b83c51
KM		 880 int oom_adjust = OOM_DISABLE;
881 unsigned long flags;
1da177e4 882
99f89551
EB		 883 if (!task)
884 return -ESRCH;
28b83c51
KM		 885
886 if (lock_task_sighand(task, &flags)) {
887 oom_adjust = task->signal->oom_adj;
888 unlock_task_sighand(task, &flags);
889 }
890
99f89551
EB		 891 put_task_struct(task);
892
8578cea7 893 len = snprintf(buffer, sizeof(buffer), "%i\n", oom_adjust);
0c28f287
AM		 894
895 return simple_read_from_buffer(buf, count, ppos, buffer, len);
1da177e4
LT		 896}
897
898static ssize_t oom_adjust_write(struct file *file, const char __user *buf,
899 size_t count, loff_t *ppos)
900{
99f89551 901 struct task_struct *task;
5d863b89 902 char buffer[PROC_NUMBUF];
0a8cb8e3 903 int oom_adjust;
28b83c51 904 unsigned long flags;
5d863b89 905 int err;
1da177e4 906
8578cea7
EB		 907 memset(buffer, 0, sizeof(buffer));
908 if (count > sizeof(buffer) - 1)
909 count = sizeof(buffer) - 1;
723548bf
DR		 910 if (copy_from_user(buffer, buf, count)) {
911 err = -EFAULT;
912 goto out;
913 }
5d863b89 914
0a8cb8e3 915 err = kstrtoint(strstrip(buffer), 0, &oom_adjust);
5d863b89 916 if (err)
723548bf 917 goto out;
8ac773b4 918 if ((oom_adjust < OOM_ADJUST_MIN || oom_adjust > OOM_ADJUST_MAX) &&
723548bf
DR		 919 oom_adjust != OOM_DISABLE) {
920 err = -EINVAL;
921 goto out;
922 }
5d863b89 923
2fddfeef 924 task = get_proc_task(file->f_path.dentry->d_inode);
723548bf
DR		 925 if (!task) {
926 err = -ESRCH;
927 goto out;
928 }
d19d5476
DR		 929
930 task_lock(task);
931 if (!task->mm) {
932 err = -EINVAL;
933 goto err_task_lock;
934 }
935
28b83c51 936 if (!lock_task_sighand(task, &flags)) {
723548bf 937 err = -ESRCH;
d19d5476 938 goto err_task_lock;
28b83c51
KM		 939 }
940
941 if (oom_adjust < task->signal->oom_adj && !capable(CAP_SYS_RESOURCE)) {
723548bf
DR		 942 err = -EACCES;
943 goto err_sighand;
8fb4fc68 944 }
28b83c51 945
51b1bd2a
DR		 946 /*
947 * Warn that /proc/pid/oom_adj is deprecated, see
948 * Documentation/feature-removal-schedule.txt.
949 */
c2142704 950 printk_once(KERN_WARNING "%s (%d): /proc/%d/oom_adj is deprecated, please use /proc/%d/oom_score_adj instead.\n",
be8f684d
DR		 951 current->comm, task_pid_nr(current), task_pid_nr(task),
952 task_pid_nr(task));
28b83c51 953 task->signal->oom_adj = oom_adjust;
a63d83f4
DR		 954 /*
955 * Scale /proc/pid/oom_score_adj appropriately ensuring that a maximum
956 * value is always attainable.
957 */
958 if (task->signal->oom_adj == OOM_ADJUST_MAX)
959 task->signal->oom_score_adj = OOM_SCORE_ADJ_MAX;
960 else
961 task->signal->oom_score_adj = (oom_adjust * OOM_SCORE_ADJ_MAX) /
962 -OOM_DISABLE;
43d2b113 963 trace_oom_score_adj_update(task);
723548bf 964err_sighand:
28b83c51 965 unlock_task_sighand(task, &flags);
d19d5476
DR		 966err_task_lock:
967 task_unlock(task);
99f89551 968 put_task_struct(task);
723548bf
DR		 969out:
970 return err < 0 ? err : count;
1da177e4
LT		 971}
972
00977a59 973static const struct file_operations proc_oom_adjust_operations = {
1da177e4
LT		 974 .read = oom_adjust_read,
975 .write = oom_adjust_write,
87df8424 976 .llseek = generic_file_llseek,
1da177e4
LT		 977};
978
a63d83f4
DR		 979static ssize_t oom_score_adj_read(struct file *file, char __user *buf,
980 size_t count, loff_t *ppos)
981{
982 struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode);
983 char buffer[PROC_NUMBUF];
984 int oom_score_adj = OOM_SCORE_ADJ_MIN;
985 unsigned long flags;
986 size_t len;
987
988 if (!task)
989 return -ESRCH;
990 if (lock_task_sighand(task, &flags)) {
991 oom_score_adj = task->signal->oom_score_adj;
992 unlock_task_sighand(task, &flags);
993 }
994 put_task_struct(task);
995 len = snprintf(buffer, sizeof(buffer), "%d\n", oom_score_adj);
996 return simple_read_from_buffer(buf, count, ppos, buffer, len);
997}
998
999static ssize_t oom_score_adj_write(struct file *file, const char __user *buf,
1000 size_t count, loff_t *ppos)
1001{
1002 struct task_struct *task;
1003 char buffer[PROC_NUMBUF];
1004 unsigned long flags;
0a8cb8e3 1005 int oom_score_adj;
a63d83f4
DR		 1006 int err;
1007
1008 memset(buffer, 0, sizeof(buffer));
1009 if (count > sizeof(buffer) - 1)
1010 count = sizeof(buffer) - 1;
723548bf
DR		 1011 if (copy_from_user(buffer, buf, count)) {
1012 err = -EFAULT;
1013 goto out;
1014 }
a63d83f4 1015
0a8cb8e3 1016 err = kstrtoint(strstrip(buffer), 0, &oom_score_adj);
a63d83f4 1017 if (err)
723548bf 1018 goto out;
a63d83f4 1019 if (oom_score_adj < OOM_SCORE_ADJ_MIN ||
723548bf
DR		 1020 oom_score_adj > OOM_SCORE_ADJ_MAX) {
1021 err = -EINVAL;
1022 goto out;
1023 }
a63d83f4
DR		 1024
1025 task = get_proc_task(file->f_path.dentry->d_inode);
723548bf
DR		 1026 if (!task) {
1027 err = -ESRCH;
1028 goto out;
1029 }
d19d5476
DR		 1030
1031 task_lock(task);
1032 if (!task->mm) {
1033 err = -EINVAL;
1034 goto err_task_lock;
1035 }
1036
a63d83f4 1037 if (!lock_task_sighand(task, &flags)) {
723548bf 1038 err = -ESRCH;
d19d5476 1039 goto err_task_lock;
a63d83f4 1040 }
d19d5476 1041
dabb16f6 1042 if (oom_score_adj < task->signal->oom_score_adj_min &&
a63d83f4 1043 !capable(CAP_SYS_RESOURCE)) {
723548bf
DR		 1044 err = -EACCES;
1045 goto err_sighand;
a63d83f4
DR		 1046 }
1047
1048 task->signal->oom_score_adj = oom_score_adj;
dabb16f6
MSB		 1049 if (has_capability_noaudit(current, CAP_SYS_RESOURCE))
1050 task->signal->oom_score_adj_min = oom_score_adj;
43d2b113 1051 trace_oom_score_adj_update(task);
a63d83f4
DR		 1052 /*
1053 * Scale /proc/pid/oom_adj appropriately ensuring that OOM_DISABLE is
1054 * always attainable.
1055 */
1056 if (task->signal->oom_score_adj == OOM_SCORE_ADJ_MIN)
1057 task->signal->oom_adj = OOM_DISABLE;
1058 else
1059 task->signal->oom_adj = (oom_score_adj * OOM_ADJUST_MAX) /
1060 OOM_SCORE_ADJ_MAX;
723548bf 1061err_sighand:
a63d83f4 1062 unlock_task_sighand(task, &flags);
d19d5476
DR		 1063err_task_lock:
1064 task_unlock(task);
a63d83f4 1065 put_task_struct(task);
723548bf
DR		 1066out:
1067 return err < 0 ? err : count;
a63d83f4
DR		 1068}
1069
1070static const struct file_operations proc_oom_score_adj_operations = {
1071 .read = oom_score_adj_read,
1072 .write = oom_score_adj_write,
6038f373 1073 .llseek = default_llseek,
a63d83f4
DR		 1074};
1075
1da177e4
LT		 1076#ifdef CONFIG_AUDITSYSCALL
1077#define TMPBUFLEN 21
1078static ssize_t proc_loginuid_read(struct file * file, char __user * buf,
1079 size_t count, loff_t *ppos)
1080{
2fddfeef 1081 struct inode * inode = file->f_path.dentry->d_inode;
99f89551 1082 struct task_struct *task = get_proc_task(inode);
1da177e4
LT		 1083 ssize_t length;
1084 char tmpbuf[TMPBUFLEN];
1085
99f89551
EB		 1086 if (!task)
1087 return -ESRCH;
1da177e4 1088 length = scnprintf(tmpbuf, TMPBUFLEN, "%u",
0c11b942 1089 audit_get_loginuid(task));
99f89551 1090 put_task_struct(task);
1da177e4
LT		 1091 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1092}
1093
1094static ssize_t proc_loginuid_write(struct file * file, const char __user * buf,
1095 size_t count, loff_t *ppos)
1096{
2fddfeef 1097 struct inode * inode = file->f_path.dentry->d_inode;
1da177e4
LT		 1098 char *page, *tmp;
1099 ssize_t length;
1da177e4
LT		 1100 uid_t loginuid;
1101
7dc52157
PM		 1102 rcu_read_lock();
1103 if (current != pid_task(proc_pid(inode), PIDTYPE_PID)) {
1104 rcu_read_unlock();
1da177e4 1105 return -EPERM;
7dc52157
PM		 1106 }
1107 rcu_read_unlock();
1da177e4 1108
e0182909
AV		 1109 if (count >= PAGE_SIZE)
1110 count = PAGE_SIZE - 1;
1da177e4
LT		 1111
1112 if (*ppos != 0) {
1113 /* No partial writes. */
1114 return -EINVAL;
1115 }
e12ba74d 1116 page = (char*)__get_free_page(GFP_TEMPORARY);
1da177e4
LT		 1117 if (!page)
1118 return -ENOMEM;
1119 length = -EFAULT;
1120 if (copy_from_user(page, buf, count))
1121 goto out_free_page;
1122
e0182909 1123 page[count] = '\0';
1da177e4
LT		 1124 loginuid = simple_strtoul(page, &tmp, 10);
1125 if (tmp == page) {
1126 length = -EINVAL;
1127 goto out_free_page;
1128
1129 }
0a300be6 1130 length = audit_set_loginuid(loginuid);
1da177e4
LT		 1131 if (likely(length == 0))
1132 length = count;
1133
1134out_free_page:
1135 free_page((unsigned long) page);
1136 return length;
1137}
1138
00977a59 1139static const struct file_operations proc_loginuid_operations = {
1da177e4
LT		 1140 .read = proc_loginuid_read,
1141 .write = proc_loginuid_write,
87df8424 1142 .llseek = generic_file_llseek,
1da177e4 1143};
1e0bd755
EP		 1144
1145static ssize_t proc_sessionid_read(struct file * file, char __user * buf,
1146 size_t count, loff_t *ppos)
1147{
1148 struct inode * inode = file->f_path.dentry->d_inode;
1149 struct task_struct *task = get_proc_task(inode);
1150 ssize_t length;
1151 char tmpbuf[TMPBUFLEN];
1152
1153 if (!task)
1154 return -ESRCH;
1155 length = scnprintf(tmpbuf, TMPBUFLEN, "%u",
1156 audit_get_sessionid(task));
1157 put_task_struct(task);
1158 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1159}
1160
1161static const struct file_operations proc_sessionid_operations = {
1162 .read = proc_sessionid_read,
87df8424 1163 .llseek = generic_file_llseek,
1e0bd755 1164};
1da177e4
LT		 1165#endif
1166
f4f154fd
AM		 1167#ifdef CONFIG_FAULT_INJECTION
1168static ssize_t proc_fault_inject_read(struct file * file, char __user * buf,
1169 size_t count, loff_t *ppos)
1170{
1171 struct task_struct *task = get_proc_task(file->f_dentry->d_inode);
1172 char buffer[PROC_NUMBUF];
1173 size_t len;
1174 int make_it_fail;
f4f154fd
AM		 1175
1176 if (!task)
1177 return -ESRCH;
1178 make_it_fail = task->make_it_fail;
1179 put_task_struct(task);
1180
1181 len = snprintf(buffer, sizeof(buffer), "%i\n", make_it_fail);
0c28f287
AM		 1182
1183 return simple_read_from_buffer(buf, count, ppos, buffer, len);
f4f154fd
AM		 1184}
1185
1186static ssize_t proc_fault_inject_write(struct file * file,
1187 const char __user * buf, size_t count, loff_t *ppos)
1188{
1189 struct task_struct *task;
1190 char buffer[PROC_NUMBUF], *end;
1191 int make_it_fail;
1192
1193 if (!capable(CAP_SYS_RESOURCE))
1194 return -EPERM;
1195 memset(buffer, 0, sizeof(buffer));
1196 if (count > sizeof(buffer) - 1)
1197 count = sizeof(buffer) - 1;
1198 if (copy_from_user(buffer, buf, count))
1199 return -EFAULT;
cba8aafe
VL		 1200 make_it_fail = simple_strtol(strstrip(buffer), &end, 0);
1201 if (*end)
1202 return -EINVAL;
f4f154fd
AM		 1203 task = get_proc_task(file->f_dentry->d_inode);
1204 if (!task)
1205 return -ESRCH;
1206 task->make_it_fail = make_it_fail;
1207 put_task_struct(task);
cba8aafe
VL		 1208
1209 return count;
f4f154fd
AM		 1210}
1211
00977a59 1212static const struct file_operations proc_fault_inject_operations = {
f4f154fd
AM		 1213 .read = proc_fault_inject_read,
1214 .write = proc_fault_inject_write,
87df8424 1215 .llseek = generic_file_llseek,
f4f154fd
AM		 1216};
1217#endif
1218
9745512c 1219
43ae34cb
IM		 1220#ifdef CONFIG_SCHED_DEBUG
1221/*
1222 * Print out various scheduling related per-task fields:
1223 */
1224static int sched_show(struct seq_file *m, void *v)
1225{
1226 struct inode *inode = m->private;
1227 struct task_struct *p;
1228
43ae34cb
IM		 1229 p = get_proc_task(inode);
1230 if (!p)
1231 return -ESRCH;
1232 proc_sched_show_task(p, m);
1233
1234 put_task_struct(p);
1235
1236 return 0;
1237}
1238
1239static ssize_t
1240sched_write(struct file *file, const char __user *buf,
1241 size_t count, loff_t *offset)
1242{
1243 struct inode *inode = file->f_path.dentry->d_inode;
1244 struct task_struct *p;
1245
43ae34cb
IM		 1246 p = get_proc_task(inode);
1247 if (!p)
1248 return -ESRCH;
1249 proc_sched_set_task(p);
1250
1251 put_task_struct(p);
1252
1253 return count;
1254}
1255
1256static int sched_open(struct inode *inode, struct file *filp)
1257{
c6a34058 1258 return single_open(filp, sched_show, inode);
43ae34cb
IM		 1259}
1260
1261static const struct file_operations proc_pid_sched_operations = {
1262 .open = sched_open,
1263 .read = seq_read,
1264 .write = sched_write,
1265 .llseek = seq_lseek,
5ea473a1 1266 .release = single_release,
43ae34cb
IM		 1267};
1268
1269#endif
1270
5091faa4
MG		 1271#ifdef CONFIG_SCHED_AUTOGROUP
1272/*
1273 * Print out autogroup related information:
1274 */
1275static int sched_autogroup_show(struct seq_file *m, void *v)
1276{
1277 struct inode *inode = m->private;
1278 struct task_struct *p;
1279
1280 p = get_proc_task(inode);
1281 if (!p)
1282 return -ESRCH;
1283 proc_sched_autogroup_show_task(p, m);
1284
1285 put_task_struct(p);
1286
1287 return 0;
1288}
1289
1290static ssize_t
1291sched_autogroup_write(struct file *file, const char __user *buf,
1292 size_t count, loff_t *offset)
1293{
1294 struct inode *inode = file->f_path.dentry->d_inode;
1295 struct task_struct *p;
1296 char buffer[PROC_NUMBUF];
0a8cb8e3 1297 int nice;
5091faa4
MG		 1298 int err;
1299
1300 memset(buffer, 0, sizeof(buffer));
1301 if (count > sizeof(buffer) - 1)
1302 count = sizeof(buffer) - 1;
1303 if (copy_from_user(buffer, buf, count))
1304 return -EFAULT;
1305
0a8cb8e3
AD		 1306 err = kstrtoint(strstrip(buffer), 0, &nice);
1307 if (err < 0)
1308 return err;
5091faa4
MG		 1309
1310 p = get_proc_task(inode);
1311 if (!p)
1312 return -ESRCH;
1313
2e5b5b3a 1314 err = proc_sched_autogroup_set_nice(p, nice);
5091faa4
MG		 1315 if (err)
1316 count = err;
1317
1318 put_task_struct(p);
1319
1320 return count;
1321}
1322
1323static int sched_autogroup_open(struct inode *inode, struct file *filp)
1324{
1325 int ret;
1326
1327 ret = single_open(filp, sched_autogroup_show, NULL);
1328 if (!ret) {
1329 struct seq_file *m = filp->private_data;
1330
1331 m->private = inode;
1332 }
1333 return ret;
1334}
1335
1336static const struct file_operations proc_pid_sched_autogroup_operations = {
1337 .open = sched_autogroup_open,
1338 .read = seq_read,
1339 .write = sched_autogroup_write,
1340 .llseek = seq_lseek,
1341 .release = single_release,
1342};
1343
1344#endif /* CONFIG_SCHED_AUTOGROUP */
1345
4614a696 1346static ssize_t comm_write(struct file *file, const char __user *buf,
1347 size_t count, loff_t *offset)
1348{
1349 struct inode *inode = file->f_path.dentry->d_inode;
1350 struct task_struct *p;
1351 char buffer[TASK_COMM_LEN];
1352
1353 memset(buffer, 0, sizeof(buffer));
1354 if (count > sizeof(buffer) - 1)
1355 count = sizeof(buffer) - 1;
1356 if (copy_from_user(buffer, buf, count))
1357 return -EFAULT;
1358
1359 p = get_proc_task(inode);
1360 if (!p)
1361 return -ESRCH;
1362
1363 if (same_thread_group(current, p))
1364 set_task_comm(p, buffer);
1365 else
1366 count = -EINVAL;
1367
1368 put_task_struct(p);
1369
1370 return count;
1371}
1372
1373static int comm_show(struct seq_file *m, void *v)
1374{
1375 struct inode *inode = m->private;
1376 struct task_struct *p;
1377
1378 p = get_proc_task(inode);
1379 if (!p)
1380 return -ESRCH;
1381
1382 task_lock(p);
1383 seq_printf(m, "%s\n", p->comm);
1384 task_unlock(p);
1385
1386 put_task_struct(p);
1387
1388 return 0;
1389}
1390
1391static int comm_open(struct inode *inode, struct file *filp)
1392{
c6a34058 1393 return single_open(filp, comm_show, inode);
4614a696 1394}
1395
1396static const struct file_operations proc_pid_set_comm_operations = {
1397 .open = comm_open,
1398 .read = seq_read,
1399 .write = comm_write,
1400 .llseek = seq_lseek,
1401 .release = single_release,
1402};
1403
7773fbc5 1404static int proc_exe_link(struct dentry *dentry, struct path *exe_path)
925d1c40
MH		 1405{
1406 struct task_struct *task;
1407 struct mm_struct *mm;
1408 struct file *exe_file;
1409
7773fbc5 1410 task = get_proc_task(dentry->d_inode);
925d1c40
MH		 1411 if (!task)
1412 return -ENOENT;
1413 mm = get_task_mm(task);
1414 put_task_struct(task);
1415 if (!mm)
1416 return -ENOENT;
1417 exe_file = get_mm_exe_file(mm);
1418 mmput(mm);
1419 if (exe_file) {
1420 *exe_path = exe_file->f_path;
1421 path_get(&exe_file->f_path);
1422 fput(exe_file);
1423 return 0;
1424 } else
1425 return -ENOENT;
1426}
1427
008b150a 1428static void *proc_pid_follow_link(struct dentry *dentry, struct nameidata *nd)
1da177e4
LT		 1429{
1430 struct inode *inode = dentry->d_inode;
1431 int error = -EACCES;
1432
1433 /* We don't need a base pointer in the /proc filesystem */
1d957f9b 1434 path_put(&nd->path);
1da177e4 1435
778c1144
EB		 1436 /* Are we allowed to snoop on the tasks file descriptors? */
1437 if (!proc_fd_access_allowed(inode))
1da177e4 1438 goto out;
1da177e4 1439
7773fbc5 1440 error = PROC_I(inode)->op.proc_get_link(dentry, &nd->path);
1da177e4 1441out:
008b150a 1442 return ERR_PTR(error);
1da177e4
LT		 1443}
1444
3dcd25f3 1445static int do_proc_readlink(struct path *path, char __user *buffer, int buflen)
1da177e4 1446{
e12ba74d 1447 char *tmp = (char*)__get_free_page(GFP_TEMPORARY);
3dcd25f3 1448 char *pathname;
1da177e4
LT		 1449 int len;
1450
1451 if (!tmp)
1452 return -ENOMEM;
0c28f287 1453
7b2a69ba 1454 pathname = d_path(path, tmp, PAGE_SIZE);
3dcd25f3
JB		 1455 len = PTR_ERR(pathname);
1456 if (IS_ERR(pathname))
1da177e4 1457 goto out;
3dcd25f3 1458 len = tmp + PAGE_SIZE - 1 - pathname;
1da177e4
LT		 1459
1460 if (len > buflen)
1461 len = buflen;
3dcd25f3 1462 if (copy_to_user(buffer, pathname, len))
1da177e4
LT		 1463 len = -EFAULT;
1464 out:
1465 free_page((unsigned long)tmp);
1466 return len;
1467}
1468
1469static int proc_pid_readlink(struct dentry * dentry, char __user * buffer, int buflen)
1470{
1471 int error = -EACCES;
1472 struct inode *inode = dentry->d_inode;
3dcd25f3 1473 struct path path;
1da177e4 1474
778c1144
EB		 1475 /* Are we allowed to snoop on the tasks file descriptors? */
1476 if (!proc_fd_access_allowed(inode))
1da177e4 1477 goto out;
1da177e4 1478
7773fbc5 1479 error = PROC_I(inode)->op.proc_get_link(dentry, &path);
1da177e4
LT		 1480 if (error)
1481 goto out;
1482
3dcd25f3
JB		 1483 error = do_proc_readlink(&path, buffer, buflen);
1484 path_put(&path);
1da177e4 1485out:
1da177e4
LT		 1486 return error;
1487}
1488
c5ef1c42 1489static const struct inode_operations proc_pid_link_inode_operations = {
1da177e4 1490 .readlink = proc_pid_readlink,
6d76fa58
LT		 1491 .follow_link = proc_pid_follow_link,
1492 .setattr = proc_setattr,
1da177e4
LT		 1493};
1494
28a6d671
EB		 1495
1496/* building an inode */
1497
1498static int task_dumpable(struct task_struct *task)
1da177e4 1499{
28a6d671
EB		 1500 int dumpable = 0;
1501 struct mm_struct *mm;
1da177e4 1502
28a6d671
EB		 1503 task_lock(task);
1504 mm = task->mm;
1505 if (mm)
6c5d5238 1506 dumpable = get_dumpable(mm);
28a6d671
EB		 1507 task_unlock(task);
1508 if(dumpable == 1)
1509 return 1;
1510 return 0;
1511}
1da177e4 1512
6b4e306a 1513struct inode *proc_pid_make_inode(struct super_block * sb, struct task_struct *task)
28a6d671
EB		 1514{
1515 struct inode * inode;
1516 struct proc_inode *ei;
c69e8d9c 1517 const struct cred *cred;
1da177e4 1518
28a6d671 1519 /* We need a new inode */
1da177e4 1520
28a6d671
EB		 1521 inode = new_inode(sb);
1522 if (!inode)
1523 goto out;
1524
1525 /* Common stuff */
1526 ei = PROC_I(inode);
85fe4025 1527 inode->i_ino = get_next_ino();
28a6d671 1528 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
28a6d671
EB		 1529 inode->i_op = &proc_def_inode_operations;
1530
1531 /*
1532 * grab the reference to task.
1533 */
1a657f78 1534 ei->pid = get_task_pid(task, PIDTYPE_PID);
28a6d671
EB		 1535 if (!ei->pid)
1536 goto out_unlock;
1537
28a6d671 1538 if (task_dumpable(task)) {
c69e8d9c
DH		 1539 rcu_read_lock();
1540 cred = __task_cred(task);
1541 inode->i_uid = cred->euid;
1542 inode->i_gid = cred->egid;
1543 rcu_read_unlock();
1da177e4 1544 }
28a6d671
EB		 1545 security_task_to_inode(task, inode);
1546
1da177e4 1547out:
28a6d671
EB		 1548 return inode;
1549
1550out_unlock:
1551 iput(inode);
1552 return NULL;
1da177e4
LT		 1553}
1554
6b4e306a 1555int pid_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
1da177e4 1556{
1da177e4 1557 struct inode *inode = dentry->d_inode;
28a6d671 1558 struct task_struct *task;
c69e8d9c 1559 const struct cred *cred;
0499680a 1560 struct pid_namespace *pid = dentry->d_sb->s_fs_info;
c69e8d9c 1561
28a6d671 1562 generic_fillattr(inode, stat);
1da177e4 1563
28a6d671 1564 rcu_read_lock();
dcb0f222
EB		 1565 stat->uid = GLOBAL_ROOT_UID;
1566 stat->gid = GLOBAL_ROOT_GID;
28a6d671
EB		 1567 task = pid_task(proc_pid(inode), PIDTYPE_PID);
1568 if (task) {
0499680a
VK		 1569 if (!has_pid_permissions(pid, task, 2)) {
1570 rcu_read_unlock();
1571 /*
1572 * This doesn't prevent learning whether PID exists,
1573 * it only makes getattr() consistent with readdir().
1574 */
1575 return -ENOENT;
1576 }
28a6d671
EB		 1577 if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) ||
1578 task_dumpable(task)) {
c69e8d9c
DH		 1579 cred = __task_cred(task);
1580 stat->uid = cred->euid;
1581 stat->gid = cred->egid;
1da177e4
LT		 1582 }
1583 }
28a6d671 1584 rcu_read_unlock();
d6e71144 1585 return 0;
1da177e4
LT		 1586}
1587
1da177e4
LT		 1588/* dentry stuff */
1589
1590/*
1591 * Exceptional case: normally we are not allowed to unhash a busy
1592 * directory. In this case, however, we can do it - no aliasing problems
1593 * due to the way we treat inodes.
1594 *
1595 * Rewrite the inode's ownerships here because the owning task may have
1596 * performed a setuid(), etc.
99f89551
EB		 1597 *
1598 * Before the /proc/pid/status file was created the only way to read
1599 * the effective uid of a /process was to stat /proc/pid. Reading
1600 * /proc/pid/status is slow enough that procps and other packages
1601 * kept stating /proc/pid. To keep the rules in /proc simple I have
1602 * made this apply to all per process world readable and executable
1603 * directories.
1da177e4 1604 */
6b4e306a 1605int pid_revalidate(struct dentry *dentry, struct nameidata *nd)
1da177e4 1606{
34286d66
NP		 1607 struct inode *inode;
1608 struct task_struct *task;
c69e8d9c
DH		 1609 const struct cred *cred;
1610
34286d66
NP		 1611 if (nd && nd->flags & LOOKUP_RCU)
1612 return -ECHILD;
1613
1614 inode = dentry->d_inode;
1615 task = get_proc_task(inode);
1616
99f89551
EB		 1617 if (task) {
1618 if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) ||
1619 task_dumpable(task)) {
c69e8d9c
DH		 1620 rcu_read_lock();
1621 cred = __task_cred(task);
1622 inode->i_uid = cred->euid;
1623 inode->i_gid = cred->egid;
1624 rcu_read_unlock();
1da177e4 1625 } else {
dcb0f222
EB		 1626 inode->i_uid = GLOBAL_ROOT_UID;
1627 inode->i_gid = GLOBAL_ROOT_GID;
1da177e4 1628 }
9ee8ab9f 1629 inode->i_mode &= ~(S_ISUID | S_ISGID);
1da177e4 1630 security_task_to_inode(task, inode);
99f89551 1631 put_task_struct(task);
1da177e4
LT		 1632 return 1;
1633 }
1634 d_drop(dentry);
1635 return 0;
1636}
1637
fe15ce44 1638static int pid_delete_dentry(const struct dentry * dentry)
99f89551 1639{
28a6d671
EB		 1640 /* Is the task we represent dead?
1641 * If so, then don't put the dentry on the lru list,
1642 * kill it immediately.
1643 */
1644 return !proc_pid(dentry->d_inode)->tasks[PIDTYPE_PID].first;
1645}
1646
6b4e306a 1647const struct dentry_operations pid_dentry_operations =
28a6d671
EB		 1648{
1649 .d_revalidate = pid_revalidate,
1650 .d_delete = pid_delete_dentry,
1651};
1652
1653/* Lookups */
1654
1c0d04c9
EB		 1655/*
1656 * Fill a directory entry.
1657 *
1658 * If possible create the dcache entry and derive our inode number and
1659 * file type from dcache entry.
1660 *
1661 * Since all of the proc inode numbers are dynamically generated, the inode
1662 * numbers do not exist until the inode is cache. This means creating the
1663 * the dcache entry in readdir is necessary to keep the inode numbers
1664 * reported by readdir in sync with the inode numbers reported
1665 * by stat.
1666 */
6b4e306a
EB		 1667int proc_fill_cache(struct file *filp, void *dirent, filldir_t filldir,
1668 const char *name, int len,
c5141e6d 1669 instantiate_t instantiate, struct task_struct *task, const void *ptr)
61a28784 1670{
2fddfeef 1671 struct dentry *child, *dir = filp->f_path.dentry;
61a28784
EB		 1672 struct inode *inode;
1673 struct qstr qname;
1674 ino_t ino = 0;
1675 unsigned type = DT_UNKNOWN;
1676
1677 qname.name = name;
1678 qname.len = len;
1679 qname.hash = full_name_hash(name, len);
1680
1681 child = d_lookup(dir, &qname);
1682 if (!child) {
1683 struct dentry *new;
1684 new = d_alloc(dir, &qname);
1685 if (new) {
1686 child = instantiate(dir->d_inode, new, task, ptr);
1687 if (child)
1688 dput(new);
1689 else
1690 child = new;
1691 }
1692 }
1693 if (!child || IS_ERR(child) || !child->d_inode)
1694 goto end_instantiate;
1695 inode = child->d_inode;
1696 if (inode) {
1697 ino = inode->i_ino;
1698 type = inode->i_mode >> 12;
1699 }
1700 dput(child);
1701end_instantiate:
1702 if (!ino)
1703 ino = find_inode_number(dir, &qname);
1704 if (!ino)
1705 ino = 1;
1706 return filldir(dirent, name, len, filp->f_pos, ino, type);
1707}
1708
28a6d671
EB		 1709static unsigned name_to_int(struct dentry *dentry)
1710{
1711 const char *name = dentry->d_name.name;
1712 int len = dentry->d_name.len;
1713 unsigned n = 0;
1714
1715 if (len > 1 && *name == '0')
1716 goto out;
1717 while (len-- > 0) {
1718 unsigned c = *name++ - '0';
1719 if (c > 9)
1720 goto out;
1721 if (n >= (~0U-9)/10)
1722 goto out;
1723 n *= 10;
1724 n += c;
1725 }
1726 return n;
1727out:
1728 return ~0U;
1729}
1730
27932742
MS		 1731#define PROC_FDINFO_MAX 64
1732
3dcd25f3 1733static int proc_fd_info(struct inode *inode, struct path *path, char *info)
28a6d671 1734{
5e442a49
LT		 1735 struct task_struct *task = get_proc_task(inode);
1736 struct files_struct *files = NULL;
28a6d671
EB		 1737 struct file *file;
1738 int fd = proc_fd(inode);
aa6afca5 1739
5e442a49
LT		 1740 if (task) {
1741 files = get_files_struct(task);
1742 put_task_struct(task);
1743 }
1744 if (files) {
1745 /*
1746 * We are not taking a ref to the file structure, so we must
1747 * hold ->file_lock.
1748 */
1749 spin_lock(&files->file_lock);
1750 file = fcheck_files(files, fd);
1751 if (file) {
1752 unsigned int f_flags;
1753 struct fdtable *fdt;
1754
1755 fdt = files_fdtable(files);
1756 f_flags = file->f_flags & ~O_CLOEXEC;
1dce27c5 1757 if (close_on_exec(fd, fdt))
5e442a49
LT		 1758 f_flags |= O_CLOEXEC;
1759
1760 if (path) {
1761 *path = file->f_path;
1762 path_get(&file->f_path);
1763 }
1764 if (info)
1765 snprintf(info, PROC_FDINFO_MAX,
1766 "pos:\t%lli\n"
1767 "flags:\t0%o\n",
1768 (long long) file->f_pos,
1769 f_flags);
1770 spin_unlock(&files->file_lock);
1771 put_files_struct(files);
1772 return 0;
99f89551 1773 }
5e442a49
LT		 1774 spin_unlock(&files->file_lock);
1775 put_files_struct(files);
1776 }
1777 return -ENOENT;
99f89551
EB		 1778}
1779
7773fbc5 1780static int proc_fd_link(struct dentry *dentry, struct path *path)
27932742 1781{
7773fbc5 1782 return proc_fd_info(dentry->d_inode, path, NULL);
27932742
MS		 1783}
1784
1da177e4
LT		 1785static int tid_fd_revalidate(struct dentry *dentry, struct nameidata *nd)
1786{
34286d66
NP		 1787 struct inode *inode;
1788 struct task_struct *task;
1789 int fd;
1da177e4 1790 struct files_struct *files;
c69e8d9c 1791 const struct cred *cred;
1da177e4 1792
34286d66
NP		 1793 if (nd && nd->flags & LOOKUP_RCU)
1794 return -ECHILD;
1795
1796 inode = dentry->d_inode;
1797 task = get_proc_task(inode);
1798 fd = proc_fd(inode);
1799
99f89551
EB		 1800 if (task) {
1801 files = get_files_struct(task);
1802 if (files) {
30a08bf2 1803 struct file *file;
99f89551 1804 rcu_read_lock();
30a08bf2
LT		 1805 file = fcheck_files(files, fd);
1806 if (file) {
1807 unsigned i_mode, f_mode = file->f_mode;
1808
99f89551
EB		 1809 rcu_read_unlock();
1810 put_files_struct(files);
30a08bf2 1811
99f89551 1812 if (task_dumpable(task)) {
c69e8d9c
DH		 1813 rcu_read_lock();
1814 cred = __task_cred(task);
1815 inode->i_uid = cred->euid;
1816 inode->i_gid = cred->egid;
1817 rcu_read_unlock();
99f89551 1818 } else {
dcb0f222
EB		 1819 inode->i_uid = GLOBAL_ROOT_UID;
1820 inode->i_gid = GLOBAL_ROOT_GID;
99f89551 1821 }
30a08bf2
LT		 1822
1823 i_mode = S_IFLNK;
1824 if (f_mode & FMODE_READ)
1825 i_mode |= S_IRUSR | S_IXUSR;
1826 if (f_mode & FMODE_WRITE)
1827 i_mode |= S_IWUSR | S_IXUSR;
1828 inode->i_mode = i_mode;
1829
99f89551
EB		 1830 security_task_to_inode(task, inode);
1831 put_task_struct(task);
1832 return 1;
1833 }
b835996f 1834 rcu_read_unlock();
1da177e4 1835 put_files_struct(files);
1da177e4 1836 }
99f89551 1837 put_task_struct(task);
1da177e4
LT		 1838 }
1839 d_drop(dentry);
1840 return 0;
1841}
1842
d72f71eb 1843static const struct dentry_operations tid_fd_dentry_operations =
1da177e4
LT		 1844{
1845 .d_revalidate = tid_fd_revalidate,
1846 .d_delete = pid_delete_dentry,
1847};
1848
444ceed8 1849static struct dentry *proc_fd_instantiate(struct inode *dir,
c5141e6d 1850 struct dentry *dentry, struct task_struct *task, const void *ptr)
1da177e4 1851{
c5141e6d 1852 unsigned fd = *(const unsigned *)ptr;
444ceed8
EB		 1853 struct inode *inode;
1854 struct proc_inode *ei;
1855 struct dentry *error = ERR_PTR(-ENOENT);
1da177e4 1856
61a28784 1857 inode = proc_pid_make_inode(dir->i_sb, task);
1da177e4
LT		 1858 if (!inode)
1859 goto out;
1860 ei = PROC_I(inode);
aed7a6c4 1861 ei->fd = fd;
444ceed8 1862
5e442a49 1863 inode->i_op = &proc_pid_link_inode_operations;
1da177e4
LT		 1864 inode->i_size = 64;
1865 ei->op.proc_get_link = proc_fd_link;
fb045adb 1866 d_set_d_op(dentry, &tid_fd_dentry_operations);
1da177e4 1867 d_add(dentry, inode);
cd6a3ce9
EB		 1868 /* Close the race of the process dying before we return the dentry */
1869 if (tid_fd_revalidate(dentry, NULL))
444ceed8 1870 error = NULL;
1da177e4 1871
444ceed8
EB		 1872 out:
1873 return error;
1da177e4
LT		 1874}
1875
27932742
MS		 1876static struct dentry *proc_lookupfd_common(struct inode *dir,
1877 struct dentry *dentry,
1878 instantiate_t instantiate)
444ceed8
EB		 1879{
1880 struct task_struct *task = get_proc_task(dir);
1881 unsigned fd = name_to_int(dentry);
1882 struct dentry *result = ERR_PTR(-ENOENT);
1883
1884 if (!task)
1885 goto out_no_task;
1886 if (fd == ~0U)
1887 goto out;
1888
27932742 1889 result = instantiate(dir, dentry, task, &fd);
444ceed8
EB		 1890out:
1891 put_task_struct(task);
1892out_no_task:
1893 return result;
1894}
1895
27932742
MS		 1896static int proc_readfd_common(struct file * filp, void * dirent,
1897 filldir_t filldir, instantiate_t instantiate)
28a6d671 1898{
2fddfeef 1899 struct dentry *dentry = filp->f_path.dentry;
28a6d671
EB		 1900 struct inode *inode = dentry->d_inode;
1901 struct task_struct *p = get_proc_task(inode);
457c2510 1902 unsigned int fd, ino;
28a6d671 1903 int retval;
28a6d671 1904 struct files_struct * files;
1da177e4 1905
28a6d671
EB		 1906 retval = -ENOENT;
1907 if (!p)
1908 goto out_no_task;
1909 retval = 0;
28a6d671
EB		 1910
1911 fd = filp->f_pos;
1912 switch (fd) {
1913 case 0:
1914 if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0)
5e442a49 1915 goto out;
28a6d671
EB		 1916 filp->f_pos++;
1917 case 1:
1918 ino = parent_ino(dentry);
1919 if (filldir(dirent, "..", 2, 1, ino, DT_DIR) < 0)
5e442a49 1920 goto out;
28a6d671
EB		 1921 filp->f_pos++;
1922 default:
1923 files = get_files_struct(p);
1924 if (!files)
5e442a49 1925 goto out;
28a6d671 1926 rcu_read_lock();
28a6d671 1927 for (fd = filp->f_pos-2;
9b4f526c 1928 fd < files_fdtable(files)->max_fds;
28a6d671 1929 fd++, filp->f_pos++) {
27932742
MS		 1930 char name[PROC_NUMBUF];
1931 int len;
28a6d671
EB		 1932
1933 if (!fcheck_files(files, fd))
1934 continue;
1935 rcu_read_unlock();
1936
27932742
MS		 1937 len = snprintf(name, sizeof(name), "%d", fd);
1938 if (proc_fill_cache(filp, dirent, filldir,
1939 name, len, instantiate,
1940 p, &fd) < 0) {
28a6d671
EB		 1941 rcu_read_lock();
1942 break;
1943 }
1944 rcu_read_lock();
1945 }
1946 rcu_read_unlock();
1947 put_files_struct(files);
1948 }
1949out:
1950 put_task_struct(p);
1951out_no_task:
1952 return retval;
1953}
1954
27932742
MS		 1955static struct dentry *proc_lookupfd(struct inode *dir, struct dentry *dentry,
1956 struct nameidata *nd)
1957{
1958 return proc_lookupfd_common(dir, dentry, proc_fd_instantiate);
1959}
1960
1961static int proc_readfd(struct file *filp, void *dirent, filldir_t filldir)
1962{
1963 return proc_readfd_common(filp, dirent, filldir, proc_fd_instantiate);
1964}
1965
1966static ssize_t proc_fdinfo_read(struct file *file, char __user *buf,
1967 size_t len, loff_t *ppos)
1968{
1969 char tmp[PROC_FDINFO_MAX];
3dcd25f3 1970 int err = proc_fd_info(file->f_path.dentry->d_inode, NULL, tmp);
27932742
MS		 1971 if (!err)
1972 err = simple_read_from_buffer(buf, len, ppos, tmp, strlen(tmp));
1973 return err;
1974}
1975
1976static const struct file_operations proc_fdinfo_file_operations = {
87df8424 1977 .open = nonseekable_open,
27932742 1978 .read = proc_fdinfo_read,
6038f373 1979 .llseek = no_llseek,
27932742
MS		 1980};
1981
00977a59 1982static const struct file_operations proc_fd_operations = {
28a6d671
EB		 1983 .read = generic_read_dir,
1984 .readdir = proc_readfd,
6038f373 1985 .llseek = default_llseek,
1da177e4
LT		 1986};
1987
640708a2
PE		 1988#ifdef CONFIG_CHECKPOINT_RESTORE
1989
1990/*
1991 * dname_to_vma_addr - maps a dentry name into two unsigned longs
1992 * which represent vma start and end addresses.
1993 */
1994static int dname_to_vma_addr(struct dentry *dentry,
1995 unsigned long *start, unsigned long *end)
1996{
1997 if (sscanf(dentry->d_name.name, "%lx-%lx", start, end) != 2)
1998 return -EINVAL;
1999
2000 return 0;
2001}
2002
2003static int map_files_d_revalidate(struct dentry *dentry, struct nameidata *nd)
2004{
2005 unsigned long vm_start, vm_end;
2006 bool exact_vma_exists = false;
2007 struct mm_struct *mm = NULL;
2008 struct task_struct *task;
2009 const struct cred *cred;
2010 struct inode *inode;
2011 int status = 0;
2012
2013 if (nd && nd->flags & LOOKUP_RCU)
2014 return -ECHILD;
2015
2016 if (!capable(CAP_SYS_ADMIN)) {
2017 status = -EACCES;
2018 goto out_notask;
2019 }
2020
2021 inode = dentry->d_inode;
2022 task = get_proc_task(inode);
2023 if (!task)
2024 goto out_notask;
2025
2026 if (!ptrace_may_access(task, PTRACE_MODE_READ))
2027 goto out;
2028
2029 mm = get_task_mm(task);
2030 if (!mm)
2031 goto out;
2032
2033 if (!dname_to_vma_addr(dentry, &vm_start, &vm_end)) {
2034 down_read(&mm->mmap_sem);
2035 exact_vma_exists = !!find_exact_vma(mm, vm_start, vm_end);
2036 up_read(&mm->mmap_sem);
2037 }
2038
2039 mmput(mm);
2040
2041 if (exact_vma_exists) {
2042 if (task_dumpable(task)) {
2043 rcu_read_lock();
2044 cred = __task_cred(task);
2045 inode->i_uid = cred->euid;
2046 inode->i_gid = cred->egid;
2047 rcu_read_unlock();
2048 } else {
dcb0f222
EB		 2049 inode->i_uid = GLOBAL_ROOT_UID;
2050 inode->i_gid = GLOBAL_ROOT_GID;
640708a2
PE		 2051 }
2052 security_task_to_inode(task, inode);
2053 status = 1;
2054 }
2055
2056out:
2057 put_task_struct(task);
2058
2059out_notask:
2060 if (status <= 0)
2061 d_drop(dentry);
2062
2063 return status;
2064}
2065
2066static const struct dentry_operations tid_map_files_dentry_operations = {
2067 .d_revalidate = map_files_d_revalidate,
2068 .d_delete = pid_delete_dentry,
2069};
2070
2071static int proc_map_files_get_link(struct dentry *dentry, struct path *path)
2072{
2073 unsigned long vm_start, vm_end;
2074 struct vm_area_struct *vma;
2075 struct task_struct *task;
2076 struct mm_struct *mm;
2077 int rc;
2078
2079 rc = -ENOENT;
2080 task = get_proc_task(dentry->d_inode);
2081 if (!task)
2082 goto out;
2083
2084 mm = get_task_mm(task);
2085 put_task_struct(task);
2086 if (!mm)
2087 goto out;
2088
2089 rc = dname_to_vma_addr(dentry, &vm_start, &vm_end);
2090 if (rc)
2091 goto out_mmput;
2092
2093 down_read(&mm->mmap_sem);
2094 vma = find_exact_vma(mm, vm_start, vm_end);
2095 if (vma && vma->vm_file) {
2096 *path = vma->vm_file->f_path;
2097 path_get(path);
2098 rc = 0;
2099 }
2100 up_read(&mm->mmap_sem);
2101
2102out_mmput:
2103 mmput(mm);
2104out:
2105 return rc;
2106}
2107
2108struct map_files_info {
2109 struct file *file;
2110 unsigned long len;
2111 unsigned char name[4*sizeof(long)+2]; /* max: %lx-%lx\0 */
2112};
2113
2114static struct dentry *
2115proc_map_files_instantiate(struct inode *dir, struct dentry *dentry,
2116 struct task_struct *task, const void *ptr)
2117{
2118 const struct file *file = ptr;
2119 struct proc_inode *ei;
2120 struct inode *inode;
2121
2122 if (!file)
2123 return ERR_PTR(-ENOENT);
2124
2125 inode = proc_pid_make_inode(dir->i_sb, task);
2126 if (!inode)
2127 return ERR_PTR(-ENOENT);
2128
2129 ei = PROC_I(inode);
2130 ei->op.proc_get_link = proc_map_files_get_link;
2131
2132 inode->i_op = &proc_pid_link_inode_operations;
2133 inode->i_size = 64;
2134 inode->i_mode = S_IFLNK;
2135
2136 if (file->f_mode & FMODE_READ)
2137 inode->i_mode |= S_IRUSR;
2138 if (file->f_mode & FMODE_WRITE)
2139 inode->i_mode |= S_IWUSR;
2140
2141 d_set_d_op(dentry, &tid_map_files_dentry_operations);
2142 d_add(dentry, inode);
2143
2144 return NULL;
2145}
2146
2147static struct dentry *proc_map_files_lookup(struct inode *dir,
2148 struct dentry *dentry, struct nameidata *nd)
2149{
2150 unsigned long vm_start, vm_end;
2151 struct vm_area_struct *vma;
2152 struct task_struct *task;
2153 struct dentry *result;
2154 struct mm_struct *mm;
2155
2156 result = ERR_PTR(-EACCES);
2157 if (!capable(CAP_SYS_ADMIN))
2158 goto out;
2159
2160 result = ERR_PTR(-ENOENT);
2161 task = get_proc_task(dir);
2162 if (!task)
2163 goto out;
2164
2165 result = ERR_PTR(-EACCES);
eb94cd96 2166 if (!ptrace_may_access(task, PTRACE_MODE_READ))
640708a2
PE		 2167 goto out_put_task;
2168
2169 result = ERR_PTR(-ENOENT);
2170 if (dname_to_vma_addr(dentry, &vm_start, &vm_end))
eb94cd96 2171 goto out_put_task;
640708a2
PE		 2172
2173 mm = get_task_mm(task);
2174 if (!mm)
eb94cd96 2175 goto out_put_task;
640708a2
PE		 2176
2177 down_read(&mm->mmap_sem);
2178 vma = find_exact_vma(mm, vm_start, vm_end);
2179 if (!vma)
2180 goto out_no_vma;
2181
2182 result = proc_map_files_instantiate(dir, dentry, task, vma->vm_file);
2183
2184out_no_vma:
2185 up_read(&mm->mmap_sem);
2186 mmput(mm);
640708a2
PE		 2187out_put_task:
2188 put_task_struct(task);
2189out:
2190 return result;
2191}
2192
2193static const struct inode_operations proc_map_files_inode_operations = {
2194 .lookup = proc_map_files_lookup,
2195 .permission = proc_fd_permission,
2196 .setattr = proc_setattr,
2197};
2198
2199static int
2200proc_map_files_readdir(struct file *filp, void *dirent, filldir_t filldir)
2201{
2202 struct dentry *dentry = filp->f_path.dentry;
2203 struct inode *inode = dentry->d_inode;
2204 struct vm_area_struct *vma;
2205 struct task_struct *task;
2206 struct mm_struct *mm;
2207 ino_t ino;
2208 int ret;
2209
2210 ret = -EACCES;
2211 if (!capable(CAP_SYS_ADMIN))
2212 goto out;
2213
2214 ret = -ENOENT;
2215 task = get_proc_task(inode);
2216 if (!task)
2217 goto out;
2218
2219 ret = -EACCES;
eb94cd96 2220 if (!ptrace_may_access(task, PTRACE_MODE_READ))
640708a2
PE		 2221 goto out_put_task;
2222
2223 ret = 0;
2224 switch (filp->f_pos) {
2225 case 0:
2226 ino = inode->i_ino;
2227 if (filldir(dirent, ".", 1, 0, ino, DT_DIR) < 0)
eb94cd96 2228 goto out_put_task;
640708a2
PE		 2229 filp->f_pos++;
2230 case 1:
2231 ino = parent_ino(dentry);
2232 if (filldir(dirent, "..", 2, 1, ino, DT_DIR) < 0)
eb94cd96 2233 goto out_put_task;
640708a2
PE		 2234 filp->f_pos++;
2235 default:
2236 {
2237 unsigned long nr_files, pos, i;
2238 struct flex_array *fa = NULL;
2239 struct map_files_info info;
2240 struct map_files_info *p;
2241
2242 mm = get_task_mm(task);
2243 if (!mm)
eb94cd96 2244 goto out_put_task;
640708a2
PE		 2245 down_read(&mm->mmap_sem);
2246
2247 nr_files = 0;
2248
2249 /*
2250 * We need two passes here:
2251 *
2252 * 1) Collect vmas of mapped files with mmap_sem taken
2253 * 2) Release mmap_sem and instantiate entries
2254 *
2255 * otherwise we get lockdep complained, since filldir()
2256 * routine might require mmap_sem taken in might_fault().
2257 */
2258
2259 for (vma = mm->mmap, pos = 2; vma; vma = vma->vm_next) {
2260 if (vma->vm_file && ++pos > filp->f_pos)
2261 nr_files++;
2262 }
2263
2264 if (nr_files) {
2265 fa = flex_array_alloc(sizeof(info), nr_files,
2266 GFP_KERNEL);
2267 if (!fa || flex_array_prealloc(fa, 0, nr_files,
2268 GFP_KERNEL)) {
2269 ret = -ENOMEM;
2270 if (fa)
2271 flex_array_free(fa);
2272 up_read(&mm->mmap_sem);
2273 mmput(mm);
eb94cd96 2274 goto out_put_task;
640708a2
PE		 2275 }
2276 for (i = 0, vma = mm->mmap, pos = 2; vma;
2277 vma = vma->vm_next) {
2278 if (!vma->vm_file)
2279 continue;
2280 if (++pos <= filp->f_pos)
2281 continue;
2282
2283 get_file(vma->vm_file);
2284 info.file = vma->vm_file;
2285 info.len = snprintf(info.name,
2286 sizeof(info.name), "%lx-%lx",
2287 vma->vm_start, vma->vm_end);
2288 if (flex_array_put(fa, i++, &info, GFP_KERNEL))
2289 BUG();
2290 }
2291 }
2292 up_read(&mm->mmap_sem);
2293
2294 for (i = 0; i < nr_files; i++) {
2295 p = flex_array_get(fa, i);
2296 ret = proc_fill_cache(filp, dirent, filldir,
2297 p->name, p->len,
2298 proc_map_files_instantiate,
2299 task, p->file);
2300 if (ret)
2301 break;
2302 filp->f_pos++;
2303 fput(p->file);
2304 }
2305 for (; i < nr_files; i++) {
2306 /*
2307 * In case of error don't forget
2308 * to put rest of file refs.
2309 */
2310 p = flex_array_get(fa, i);
2311 fput(p->file);
2312 }
2313 if (fa)
2314 flex_array_free(fa);
2315 mmput(mm);
2316 }
2317 }
2318
640708a2
PE		 2319out_put_task:
2320 put_task_struct(task);
2321out:
2322 return ret;
2323}
2324
2325static const struct file_operations proc_map_files_operations = {
2326 .read = generic_read_dir,
2327 .readdir = proc_map_files_readdir,
2328 .llseek = default_llseek,
2329};
2330
2331#endif /* CONFIG_CHECKPOINT_RESTORE */
2332
8948e11f
AD		 2333/*
2334 * /proc/pid/fd needs a special permission handler so that a process can still
2335 * access /proc/self/fd after it has executed a setuid().
2336 */
10556cb2 2337static int proc_fd_permission(struct inode *inode, int mask)
8948e11f 2338{
2830ba7f 2339 int rv = generic_permission(inode, mask);
8948e11f
AD		 2340 if (rv == 0)
2341 return 0;
2342 if (task_pid(current) == proc_pid(inode))
2343 rv = 0;
2344 return rv;
2345}
2346
1da177e4
LT		 2347/*
2348 * proc directories can do almost nothing..
2349 */
c5ef1c42 2350static const struct inode_operations proc_fd_inode_operations = {
1da177e4 2351 .lookup = proc_lookupfd,
8948e11f 2352 .permission = proc_fd_permission,
6d76fa58 2353 .setattr = proc_setattr,
1da177e4
LT		 2354};
2355
27932742
MS		 2356static struct dentry *proc_fdinfo_instantiate(struct inode *dir,
2357 struct dentry *dentry, struct task_struct *task, const void *ptr)
2358{
2359 unsigned fd = *(unsigned *)ptr;
2360 struct inode *inode;
2361 struct proc_inode *ei;
2362 struct dentry *error = ERR_PTR(-ENOENT);
2363
2364 inode = proc_pid_make_inode(dir->i_sb, task);
2365 if (!inode)
2366 goto out;
2367 ei = PROC_I(inode);
2368 ei->fd = fd;
2369 inode->i_mode = S_IFREG | S_IRUSR;
2370 inode->i_fop = &proc_fdinfo_file_operations;
fb045adb 2371 d_set_d_op(dentry, &tid_fd_dentry_operations);
27932742
MS		 2372 d_add(dentry, inode);
2373 /* Close the race of the process dying before we return the dentry */
2374 if (tid_fd_revalidate(dentry, NULL))
2375 error = NULL;
2376
2377 out:
2378 return error;
2379}
2380
2381static struct dentry *proc_lookupfdinfo(struct inode *dir,
2382 struct dentry *dentry,
2383 struct nameidata *nd)
2384{
2385 return proc_lookupfd_common(dir, dentry, proc_fdinfo_instantiate);
2386}
2387
2388static int proc_readfdinfo(struct file *filp, void *dirent, filldir_t filldir)
2389{
2390 return proc_readfd_common(filp, dirent, filldir,
2391 proc_fdinfo_instantiate);
2392}
2393
2394static const struct file_operations proc_fdinfo_operations = {
2395 .read = generic_read_dir,
2396 .readdir = proc_readfdinfo,
6038f373 2397 .llseek = default_llseek,
27932742
MS		 2398};
2399
2400/*
2401 * proc directories can do almost nothing..
2402 */
2403static const struct inode_operations proc_fdinfo_inode_operations = {
2404 .lookup = proc_lookupfdinfo,
2405 .setattr = proc_setattr,
2406};
2407
2408
444ceed8 2409static struct dentry *proc_pident_instantiate(struct inode *dir,
c5141e6d 2410 struct dentry *dentry, struct task_struct *task, const void *ptr)
444ceed8 2411{
c5141e6d 2412 const struct pid_entry *p = ptr;
444ceed8
EB		 2413 struct inode *inode;
2414 struct proc_inode *ei;
bd6daba9 2415 struct dentry *error = ERR_PTR(-ENOENT);
444ceed8 2416
61a28784 2417 inode = proc_pid_make_inode(dir->i_sb, task);
444ceed8
EB		 2418 if (!inode)
2419 goto out;
2420
2421 ei = PROC_I(inode);
2422 inode->i_mode = p->mode;
2423 if (S_ISDIR(inode->i_mode))
bfe86848 2424 set_nlink(inode, 2); /* Use getattr to fix if necessary */
444ceed8
EB		 2425 if (p->iop)
2426 inode->i_op = p->iop;
2427 if (p->fop)
2428 inode->i_fop = p->fop;
2429 ei->op = p->op;
fb045adb 2430 d_set_d_op(dentry, &pid_dentry_operations);
444ceed8
EB		 2431 d_add(dentry, inode);
2432 /* Close the race of the process dying before we return the dentry */
2433 if (pid_revalidate(dentry, NULL))
2434 error = NULL;
2435out:
2436 return error;
2437}
2438
1da177e4
LT		 2439static struct dentry *proc_pident_lookup(struct inode *dir,
2440 struct dentry *dentry,
c5141e6d 2441 const struct pid_entry *ents,
7bcd6b0e 2442 unsigned int nents)
1da177e4 2443{
cd6a3ce9 2444 struct dentry *error;
99f89551 2445 struct task_struct *task = get_proc_task(dir);
c5141e6d 2446 const struct pid_entry *p, *last;
1da177e4 2447
cd6a3ce9 2448 error = ERR_PTR(-ENOENT);
1da177e4 2449
99f89551
EB		 2450 if (!task)
2451 goto out_no_task;
1da177e4 2452
20cdc894
EB		 2453 /*
2454 * Yes, it does not scale. And it should not. Don't add
2455 * new entries into /proc/<tgid>/ without very good reasons.
2456 */
7bcd6b0e
EB		 2457 last = &ents[nents - 1];
2458 for (p = ents; p <= last; p++) {
1da177e4
LT		 2459 if (p->len != dentry->d_name.len)
2460 continue;
2461 if (!memcmp(dentry->d_name.name, p->name, p->len))
2462 break;
2463 }
7bcd6b0e 2464 if (p > last)
1da177e4
LT		 2465 goto out;
2466
444ceed8 2467 error = proc_pident_instantiate(dir, dentry, task, p);
1da177e4 2468out:
99f89551
EB		 2469 put_task_struct(task);
2470out_no_task:
cd6a3ce9 2471 return error;
1da177e4
LT		 2472}
2473
c5141e6d
ED		 2474static int proc_pident_fill_cache(struct file *filp, void *dirent,
2475 filldir_t filldir, struct task_struct *task, const struct pid_entry *p)
61a28784
EB		 2476{
2477 return proc_fill_cache(filp, dirent, filldir, p->name, p->len,
2478 proc_pident_instantiate, task, p);
2479}
2480
28a6d671
EB		 2481static int proc_pident_readdir(struct file *filp,
2482 void *dirent, filldir_t filldir,
c5141e6d 2483 const struct pid_entry *ents, unsigned int nents)
28a6d671
EB		 2484{
2485 int i;
2fddfeef 2486 struct dentry *dentry = filp->f_path.dentry;
28a6d671
EB		 2487 struct inode *inode = dentry->d_inode;
2488 struct task_struct *task = get_proc_task(inode);
c5141e6d 2489 const struct pid_entry *p, *last;
28a6d671
EB		 2490 ino_t ino;
2491 int ret;
2492
2493 ret = -ENOENT;
2494 if (!task)
61a28784 2495 goto out_no_task;
28a6d671
EB		 2496
2497 ret = 0;
28a6d671
EB		 2498 i = filp->f_pos;
2499 switch (i) {
2500 case 0:
2501 ino = inode->i_ino;
2502 if (filldir(dirent, ".", 1, i, ino, DT_DIR) < 0)
2503 goto out;
2504 i++;
2505 filp->f_pos++;
2506 /* fall through */
2507 case 1:
2508 ino = parent_ino(dentry);
2509 if (filldir(dirent, "..", 2, i, ino, DT_DIR) < 0)
2510 goto out;
2511 i++;
2512 filp->f_pos++;
2513 /* fall through */
2514 default:
2515 i -= 2;
2516 if (i >= nents) {
2517 ret = 1;
2518 goto out;
2519 }
2520 p = ents + i;
7bcd6b0e
EB		 2521 last = &ents[nents - 1];
2522 while (p <= last) {
61a28784 2523 if (proc_pident_fill_cache(filp, dirent, filldir, task, p) < 0)
28a6d671
EB		 2524 goto out;
2525 filp->f_pos++;
2526 p++;
2527 }
2528 }
2529
2530 ret = 1;
2531out:
61a28784
EB		 2532 put_task_struct(task);
2533out_no_task:
28a6d671 2534 return ret;
1da177e4
LT		 2535}
2536
28a6d671
EB		 2537#ifdef CONFIG_SECURITY
2538static ssize_t proc_pid_attr_read(struct file * file, char __user * buf,
2539 size_t count, loff_t *ppos)
2540{
2fddfeef 2541 struct inode * inode = file->f_path.dentry->d_inode;
04ff9708 2542 char *p = NULL;
28a6d671
EB		 2543 ssize_t length;
2544 struct task_struct *task = get_proc_task(inode);
2545
28a6d671 2546 if (!task)
04ff9708 2547 return -ESRCH;
28a6d671
EB		 2548
2549 length = security_getprocattr(task,
2fddfeef 2550 (char*)file->f_path.dentry->d_name.name,
04ff9708 2551 &p);
28a6d671 2552 put_task_struct(task);
04ff9708
AV		 2553 if (length > 0)
2554 length = simple_read_from_buffer(buf, count, ppos, p, length);
2555 kfree(p);
28a6d671 2556 return length;
1da177e4
LT		 2557}
2558
28a6d671
EB		 2559static ssize_t proc_pid_attr_write(struct file * file, const char __user * buf,
2560 size_t count, loff_t *ppos)
2561{
2fddfeef 2562 struct inode * inode = file->f_path.dentry->d_inode;
28a6d671
EB		 2563 char *page;
2564 ssize_t length;
2565 struct task_struct *task = get_proc_task(inode);
2566
2567 length = -ESRCH;
2568 if (!task)
2569 goto out_no_task;
2570 if (count > PAGE_SIZE)
2571 count = PAGE_SIZE;
2572
2573 /* No partial writes. */
2574 length = -EINVAL;
2575 if (*ppos != 0)
2576 goto out;
2577
2578 length = -ENOMEM;
e12ba74d 2579 page = (char*)__get_free_page(GFP_TEMPORARY);
28a6d671
EB		 2580 if (!page)
2581 goto out;
2582
2583 length = -EFAULT;
2584 if (copy_from_user(page, buf, count))
2585 goto out_free;
2586
107db7c7 2587 /* Guard against adverse ptrace interaction */
9b1bf12d 2588 length = mutex_lock_interruptible(&task->signal->cred_guard_mutex);
107db7c7
DH		 2589 if (length < 0)
2590 goto out_free;
2591
28a6d671 2592 length = security_setprocattr(task,
2fddfeef 2593 (char*)file->f_path.dentry->d_name.name,
28a6d671 2594 (void*)page, count);
9b1bf12d 2595 mutex_unlock(&task->signal->cred_guard_mutex);
28a6d671
EB		 2596out_free:
2597 free_page((unsigned long) page);
2598out:
2599 put_task_struct(task);
2600out_no_task:
2601 return length;
2602}
2603
00977a59 2604static const struct file_operations proc_pid_attr_operations = {
28a6d671
EB		 2605 .read = proc_pid_attr_read,
2606 .write = proc_pid_attr_write,
87df8424 2607 .llseek = generic_file_llseek,
28a6d671
EB		 2608};
2609
c5141e6d 2610static const struct pid_entry attr_dir_stuff[] = {
631f9c18
AD		 2611 REG("current", S_IRUGO|S_IWUGO, proc_pid_attr_operations),
2612 REG("prev", S_IRUGO, proc_pid_attr_operations),
2613 REG("exec", S_IRUGO|S_IWUGO, proc_pid_attr_operations),
2614 REG("fscreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations),
2615 REG("keycreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations),
2616 REG("sockcreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations),
28a6d671
EB		 2617};
2618
72d9dcfc 2619static int proc_attr_dir_readdir(struct file * filp,
28a6d671
EB		 2620 void * dirent, filldir_t filldir)
2621{
2622 return proc_pident_readdir(filp,dirent,filldir,
72d9dcfc 2623 attr_dir_stuff,ARRAY_SIZE(attr_dir_stuff));
28a6d671
EB		 2624}
2625
00977a59 2626static const struct file_operations proc_attr_dir_operations = {
1da177e4 2627 .read = generic_read_dir,
72d9dcfc 2628 .readdir = proc_attr_dir_readdir,
6038f373 2629 .llseek = default_llseek,
1da177e4
LT		 2630};
2631
72d9dcfc 2632static struct dentry *proc_attr_dir_lookup(struct inode *dir,
28a6d671
EB		 2633 struct dentry *dentry, struct nameidata *nd)
2634{
7bcd6b0e
EB		 2635 return proc_pident_lookup(dir, dentry,
2636 attr_dir_stuff, ARRAY_SIZE(attr_dir_stuff));
28a6d671
EB		 2637}
2638
c5ef1c42 2639static const struct inode_operations proc_attr_dir_inode_operations = {
72d9dcfc 2640 .lookup = proc_attr_dir_lookup,
99f89551 2641 .getattr = pid_getattr,
6d76fa58 2642 .setattr = proc_setattr,
1da177e4
LT		 2643};
2644
28a6d671
EB		 2645#endif
2646
698ba7b5 2647#ifdef CONFIG_ELF_CORE
3cb4a0bb
KH		 2648static ssize_t proc_coredump_filter_read(struct file *file, char __user *buf,
2649 size_t count, loff_t *ppos)
2650{
2651 struct task_struct *task = get_proc_task(file->f_dentry->d_inode);
2652 struct mm_struct *mm;
2653 char buffer[PROC_NUMBUF];
2654 size_t len;
2655 int ret;
2656
2657 if (!task)
2658 return -ESRCH;
2659
2660 ret = 0;
2661 mm = get_task_mm(task);
2662 if (mm) {
2663 len = snprintf(buffer, sizeof(buffer), "%08lx\n",
2664 ((mm->flags & MMF_DUMP_FILTER_MASK) >>
2665 MMF_DUMP_FILTER_SHIFT));
2666 mmput(mm);
2667 ret = simple_read_from_buffer(buf, count, ppos, buffer, len);
2668 }
2669
2670 put_task_struct(task);
2671
2672 return ret;
2673}
2674
2675static ssize_t proc_coredump_filter_write(struct file *file,
2676 const char __user *buf,
2677 size_t count,
2678 loff_t *ppos)
2679{
2680 struct task_struct *task;
2681 struct mm_struct *mm;
2682 char buffer[PROC_NUMBUF], *end;
2683 unsigned int val;
2684 int ret;
2685 int i;
2686 unsigned long mask;
2687
2688 ret = -EFAULT;
2689 memset(buffer, 0, sizeof(buffer));
2690 if (count > sizeof(buffer) - 1)
2691 count = sizeof(buffer) - 1;
2692 if (copy_from_user(buffer, buf, count))
2693 goto out_no_task;
2694
2695 ret = -EINVAL;
2696 val = (unsigned int)simple_strtoul(buffer, &end, 0);
2697 if (*end == '\n')
2698 end++;
2699 if (end - buffer == 0)
2700 goto out_no_task;
2701
2702 ret = -ESRCH;
2703 task = get_proc_task(file->f_dentry->d_inode);
2704 if (!task)
2705 goto out_no_task;
2706
2707 ret = end - buffer;
2708 mm = get_task_mm(task);
2709 if (!mm)
2710 goto out_no_mm;
2711
2712 for (i = 0, mask = 1; i < MMF_DUMP_FILTER_BITS; i++, mask <<= 1) {
2713 if (val & mask)
2714 set_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags);
2715 else
2716 clear_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags);
2717 }
2718
2719 mmput(mm);
2720 out_no_mm:
2721 put_task_struct(task);
2722 out_no_task:
2723 return ret;
2724}
2725
2726static const struct file_operations proc_coredump_filter_operations = {
2727 .read = proc_coredump_filter_read,
2728 .write = proc_coredump_filter_write,
87df8424 2729 .llseek = generic_file_llseek,
3cb4a0bb
KH		 2730};
2731#endif
2732
28a6d671
EB		 2733/*
2734 * /proc/self:
2735 */
2736static int proc_self_readlink(struct dentry *dentry, char __user *buffer,
2737 int buflen)
2738{
488e5bc4 2739 struct pid_namespace *ns = dentry->d_sb->s_fs_info;
b55fcb22 2740 pid_t tgid = task_tgid_nr_ns(current, ns);
28a6d671 2741 char tmp[PROC_NUMBUF];
b55fcb22 2742 if (!tgid)
488e5bc4 2743 return -ENOENT;
b55fcb22 2744 sprintf(tmp, "%d", tgid);
28a6d671
EB		 2745 return vfs_readlink(dentry,buffer,buflen,tmp);
2746}
2747
2748static void *proc_self_follow_link(struct dentry *dentry, struct nameidata *nd)
2749{
488e5bc4 2750 struct pid_namespace *ns = dentry->d_sb->s_fs_info;
b55fcb22 2751 pid_t tgid = task_tgid_nr_ns(current, ns);
7fee4868
AV		 2752 char *name = ERR_PTR(-ENOENT);
2753 if (tgid) {
2754 name = __getname();
2755 if (!name)
2756 name = ERR_PTR(-ENOMEM);
2757 else
2758 sprintf(name, "%d", tgid);
2759 }
2760 nd_set_link(nd, name);
2761 return NULL;
2762}
2763
2764static void proc_self_put_link(struct dentry *dentry, struct nameidata *nd,
2765 void *cookie)
2766{
2767 char *s = nd_get_link(nd);
2768 if (!IS_ERR(s))
2769 __putname(s);
28a6d671
EB		 2770}
2771
c5ef1c42 2772static const struct inode_operations proc_self_inode_operations = {
28a6d671
EB		 2773 .readlink = proc_self_readlink,
2774 .follow_link = proc_self_follow_link,
7fee4868 2775 .put_link = proc_self_put_link,
28a6d671
EB		 2776};
2777
801199ce
EB		 2778/*
2779 * proc base
2780 *
2781 * These are the directory entries in the root directory of /proc
2782 * that properly belong to the /proc filesystem, as they describe
2783 * describe something that is process related.
2784 */
c5141e6d 2785static const struct pid_entry proc_base_stuff[] = {
61a28784 2786 NOD("self", S_IFLNK|S_IRWXUGO,
801199ce 2787 &proc_self_inode_operations, NULL, {}),
801199ce
EB		 2788};
2789
444ceed8 2790static struct dentry *proc_base_instantiate(struct inode *dir,
c5141e6d 2791 struct dentry *dentry, struct task_struct *task, const void *ptr)
801199ce 2792{
c5141e6d 2793 const struct pid_entry *p = ptr;
801199ce 2794 struct inode *inode;
801199ce 2795 struct proc_inode *ei;
73d36460 2796 struct dentry *error;
801199ce
EB		 2797
2798 /* Allocate the inode */
2799 error = ERR_PTR(-ENOMEM);
2800 inode = new_inode(dir->i_sb);
2801 if (!inode)
2802 goto out;
2803
2804 /* Initialize the inode */
2805 ei = PROC_I(inode);
85fe4025 2806 inode->i_ino = get_next_ino();
801199ce 2807 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
801199ce
EB		 2808
2809 /*
2810 * grab the reference to the task.
2811 */
1a657f78 2812 ei->pid = get_task_pid(task, PIDTYPE_PID);
801199ce
EB		 2813 if (!ei->pid)
2814 goto out_iput;
2815
801199ce
EB		 2816 inode->i_mode = p->mode;
2817 if (S_ISDIR(inode->i_mode))
bfe86848 2818 set_nlink(inode, 2);
801199ce
EB		 2819 if (S_ISLNK(inode->i_mode))
2820 inode->i_size = 64;
2821 if (p->iop)
2822 inode->i_op = p->iop;
2823 if (p->fop)
2824 inode->i_fop = p->fop;
2825 ei->op = p->op;
801199ce
EB		 2826 d_add(dentry, inode);
2827 error = NULL;
2828out:
801199ce
EB		 2829 return error;
2830out_iput:
2831 iput(inode);
2832 goto out;
2833}
2834
444ceed8
EB		 2835static struct dentry *proc_base_lookup(struct inode *dir, struct dentry *dentry)
2836{
2837 struct dentry *error;
2838 struct task_struct *task = get_proc_task(dir);
c5141e6d 2839 const struct pid_entry *p, *last;
444ceed8
EB		 2840
2841 error = ERR_PTR(-ENOENT);
2842
2843 if (!task)
2844 goto out_no_task;
2845
2846 /* Lookup the directory entry */
7bcd6b0e
EB		 2847 last = &proc_base_stuff[ARRAY_SIZE(proc_base_stuff) - 1];
2848 for (p = proc_base_stuff; p <= last; p++) {
444ceed8
EB		 2849 if (p->len != dentry->d_name.len)
2850 continue;
2851 if (!memcmp(dentry->d_name.name, p->name, p->len))
2852 break;
2853 }
7bcd6b0e 2854 if (p > last)
444ceed8
EB		 2855 goto out;
2856
2857 error = proc_base_instantiate(dir, dentry, task, p);
2858
2859out:
2860 put_task_struct(task);
2861out_no_task:
2862 return error;
2863}
2864
c5141e6d
ED		 2865static int proc_base_fill_cache(struct file *filp, void *dirent,
2866 filldir_t filldir, struct task_struct *task, const struct pid_entry *p)
61a28784
EB		 2867{
2868 return proc_fill_cache(filp, dirent, filldir, p->name, p->len,
2869 proc_base_instantiate, task, p);
2870}
2871
aba76fdb 2872#ifdef CONFIG_TASK_IO_ACCOUNTING
297c5d92
AR		 2873static int do_io_accounting(struct task_struct *task, char *buffer, int whole)
2874{
940389b8 2875 struct task_io_accounting acct = task->ioac;
5995477a 2876 unsigned long flags;
293eb1e7 2877 int result;
5995477a 2878
293eb1e7
VK		 2879 result = mutex_lock_killable(&task->signal->cred_guard_mutex);
2880 if (result)
2881 return result;
2882
2883 if (!ptrace_may_access(task, PTRACE_MODE_READ)) {
2884 result = -EACCES;
2885 goto out_unlock;
2886 }
1d1221f3 2887
5995477a
AR		 2888 if (whole && lock_task_sighand(task, &flags)) {
2889 struct task_struct *t = task;
2890
2891 task_io_accounting_add(&acct, &task->signal->ioac);
2892 while_each_thread(task, t)
2893 task_io_accounting_add(&acct, &t->ioac);
2894
2895 unlock_task_sighand(task, &flags);
297c5d92 2896 }
293eb1e7 2897 result = sprintf(buffer,
aba76fdb
AM		 2898 "rchar: %llu\n"
2899 "wchar: %llu\n"
2900 "syscr: %llu\n"
2901 "syscw: %llu\n"
2902 "read_bytes: %llu\n"
2903 "write_bytes: %llu\n"
2904 "cancelled_write_bytes: %llu\n",
7c44319d
AB		 2905 (unsigned long long)acct.rchar,
2906 (unsigned long long)acct.wchar,
2907 (unsigned long long)acct.syscr,
2908 (unsigned long long)acct.syscw,
2909 (unsigned long long)acct.read_bytes,
2910 (unsigned long long)acct.write_bytes,
2911 (unsigned long long)acct.cancelled_write_bytes);
293eb1e7
VK		 2912out_unlock:
2913 mutex_unlock(&task->signal->cred_guard_mutex);
2914 return result;
297c5d92
AR		 2915}
2916
2917static int proc_tid_io_accounting(struct task_struct *task, char *buffer)
2918{
2919 return do_io_accounting(task, buffer, 0);
aba76fdb 2920}
297c5d92
AR		 2921
2922static int proc_tgid_io_accounting(struct task_struct *task, char *buffer)
2923{
2924 return do_io_accounting(task, buffer, 1);
2925}
2926#endif /* CONFIG_TASK_IO_ACCOUNTING */
aba76fdb 2927
22d917d8
EB		 2928#ifdef CONFIG_USER_NS
2929static int proc_id_map_open(struct inode *inode, struct file *file,
2930 struct seq_operations *seq_ops)
2931{
2932 struct user_namespace *ns = NULL;
2933 struct task_struct *task;
2934 struct seq_file *seq;
2935 int ret = -EINVAL;
2936
2937 task = get_proc_task(inode);
2938 if (task) {
2939 rcu_read_lock();
2940 ns = get_user_ns(task_cred_xxx(task, user_ns));
2941 rcu_read_unlock();
2942 put_task_struct(task);
2943 }
2944 if (!ns)
2945 goto err;
2946
2947 ret = seq_open(file, seq_ops);
2948 if (ret)
2949 goto err_put_ns;
2950
2951 seq = file->private_data;
2952 seq->private = ns;
2953
2954 return 0;
2955err_put_ns:
2956 put_user_ns(ns);
2957err:
2958 return ret;
2959}
2960
2961static int proc_id_map_release(struct inode *inode, struct file *file)
2962{
2963 struct seq_file *seq = file->private_data;
2964 struct user_namespace *ns = seq->private;
2965 put_user_ns(ns);
2966 return seq_release(inode, file);
2967}
2968
2969static int proc_uid_map_open(struct inode *inode, struct file *file)
2970{
2971 return proc_id_map_open(inode, file, &proc_uid_seq_operations);
2972}
2973
2974static int proc_gid_map_open(struct inode *inode, struct file *file)
2975{
2976 return proc_id_map_open(inode, file, &proc_gid_seq_operations);
2977}
2978
2979static const struct file_operations proc_uid_map_operations = {
2980 .open = proc_uid_map_open,
2981 .write = proc_uid_map_write,
2982 .read = seq_read,
2983 .llseek = seq_lseek,
2984 .release = proc_id_map_release,
2985};
2986
2987static const struct file_operations proc_gid_map_operations = {
2988 .open = proc_gid_map_open,
2989 .write = proc_gid_map_write,
2990 .read = seq_read,
2991 .llseek = seq_lseek,
2992 .release = proc_id_map_release,
2993};
2994#endif /* CONFIG_USER_NS */
2995
47830723
KC		 2996static int proc_pid_personality(struct seq_file *m, struct pid_namespace *ns,
2997 struct pid *pid, struct task_struct *task)
2998{
a9712bc1
AV		 2999 int err = lock_trace(task);
3000 if (!err) {
3001 seq_printf(m, "%08x\n", task->personality);
3002 unlock_trace(task);
3003 }
3004 return err;
47830723
KC		 3005}
3006
28a6d671
EB		 3007/*
3008 * Thread groups
3009 */
00977a59 3010static const struct file_operations proc_task_operations;
c5ef1c42 3011static const struct inode_operations proc_task_inode_operations;
20cdc894 3012
c5141e6d 3013static const struct pid_entry tgid_base_stuff[] = {
631f9c18
AD		 3014 DIR("task", S_IRUGO|S_IXUGO, proc_task_inode_operations, proc_task_operations),
3015 DIR("fd", S_IRUSR|S_IXUSR, proc_fd_inode_operations, proc_fd_operations),
640708a2
PE		 3016#ifdef CONFIG_CHECKPOINT_RESTORE
3017 DIR("map_files", S_IRUSR|S_IXUSR, proc_map_files_inode_operations, proc_map_files_operations),
3018#endif
631f9c18 3019 DIR("fdinfo", S_IRUSR|S_IXUSR, proc_fdinfo_inode_operations, proc_fdinfo_operations),
6b4e306a 3020 DIR("ns", S_IRUSR|S_IXUGO, proc_ns_dir_inode_operations, proc_ns_dir_operations),
b2211a36 3021#ifdef CONFIG_NET
631f9c18 3022 DIR("net", S_IRUGO|S_IXUGO, proc_net_inode_operations, proc_net_operations),
b2211a36 3023#endif
631f9c18
AD		 3024 REG("environ", S_IRUSR, proc_environ_operations),
3025 INF("auxv", S_IRUSR, proc_pid_auxv),
3026 ONE("status", S_IRUGO, proc_pid_status),
a9712bc1 3027 ONE("personality", S_IRUGO, proc_pid_personality),
3036e7b4 3028 INF("limits", S_IRUGO, proc_pid_limits),
43ae34cb 3029#ifdef CONFIG_SCHED_DEBUG
631f9c18 3030 REG("sched", S_IRUGO|S_IWUSR, proc_pid_sched_operations),
5091faa4
MG		 3031#endif
3032#ifdef CONFIG_SCHED_AUTOGROUP
3033 REG("autogroup", S_IRUGO|S_IWUSR, proc_pid_sched_autogroup_operations),
ebcb6734 3034#endif
4614a696 3035 REG("comm", S_IRUGO|S_IWUSR, proc_pid_set_comm_operations),
ebcb6734 3036#ifdef CONFIG_HAVE_ARCH_TRACEHOOK
a9712bc1 3037 INF("syscall", S_IRUGO, proc_pid_syscall),
43ae34cb 3038#endif
631f9c18
AD		 3039 INF("cmdline", S_IRUGO, proc_pid_cmdline),
3040 ONE("stat", S_IRUGO, proc_tgid_stat),
3041 ONE("statm", S_IRUGO, proc_pid_statm),
b7643757 3042 REG("maps", S_IRUGO, proc_pid_maps_operations),
28a6d671 3043#ifdef CONFIG_NUMA
b7643757 3044 REG("numa_maps", S_IRUGO, proc_pid_numa_maps_operations),
28a6d671 3045#endif
631f9c18
AD		 3046 REG("mem", S_IRUSR|S_IWUSR, proc_mem_operations),
3047 LNK("cwd", proc_cwd_link),
3048 LNK("root", proc_root_link),
3049 LNK("exe", proc_exe_link),
3050 REG("mounts", S_IRUGO, proc_mounts_operations),
3051 REG("mountinfo", S_IRUGO, proc_mountinfo_operations),
3052 REG("mountstats", S_IRUSR, proc_mountstats_operations),
1e883281 3053#ifdef CONFIG_PROC_PAGE_MONITOR
631f9c18 3054 REG("clear_refs", S_IWUSR, proc_clear_refs_operations),
b7643757 3055 REG("smaps", S_IRUGO, proc_pid_smaps_operations),
ca6b0bf0 3056 REG("pagemap", S_IRUGO, proc_pagemap_operations),
28a6d671
EB		 3057#endif
3058#ifdef CONFIG_SECURITY
631f9c18 3059 DIR("attr", S_IRUGO|S_IXUGO, proc_attr_dir_inode_operations, proc_attr_dir_operations),
28a6d671
EB		 3060#endif
3061#ifdef CONFIG_KALLSYMS
631f9c18 3062 INF("wchan", S_IRUGO, proc_pid_wchan),
28a6d671 3063#endif
2ec220e2 3064#ifdef CONFIG_STACKTRACE
a9712bc1 3065 ONE("stack", S_IRUGO, proc_pid_stack),
28a6d671
EB		 3066#endif
3067#ifdef CONFIG_SCHEDSTATS
631f9c18 3068 INF("schedstat", S_IRUGO, proc_pid_schedstat),
28a6d671 3069#endif
9745512c 3070#ifdef CONFIG_LATENCYTOP
631f9c18 3071 REG("latency", S_IRUGO, proc_lstats_operations),
9745512c 3072#endif
8793d854 3073#ifdef CONFIG_PROC_PID_CPUSET
631f9c18 3074 REG("cpuset", S_IRUGO, proc_cpuset_operations),
a424316c
PM		 3075#endif
3076#ifdef CONFIG_CGROUPS
631f9c18 3077 REG("cgroup", S_IRUGO, proc_cgroup_operations),
28a6d671 3078#endif
631f9c18
AD		 3079 INF("oom_score", S_IRUGO, proc_oom_score),
3080 REG("oom_adj", S_IRUGO|S_IWUSR, proc_oom_adjust_operations),
a63d83f4 3081 REG("oom_score_adj", S_IRUGO|S_IWUSR, proc_oom_score_adj_operations),
28a6d671 3082#ifdef CONFIG_AUDITSYSCALL
631f9c18
AD		 3083 REG("loginuid", S_IWUSR|S_IRUGO, proc_loginuid_operations),
3084 REG("sessionid", S_IRUGO, proc_sessionid_operations),
28a6d671 3085#endif
f4f154fd 3086#ifdef CONFIG_FAULT_INJECTION
631f9c18 3087 REG("make-it-fail", S_IRUGO|S_IWUSR, proc_fault_inject_operations),
f4f154fd 3088#endif
698ba7b5 3089#ifdef CONFIG_ELF_CORE
631f9c18 3090 REG("coredump_filter", S_IRUGO|S_IWUSR, proc_coredump_filter_operations),
3cb4a0bb 3091#endif
aba76fdb 3092#ifdef CONFIG_TASK_IO_ACCOUNTING
1d1221f3 3093 INF("io", S_IRUSR, proc_tgid_io_accounting),
aba76fdb 3094#endif
f133ecca
CM		 3095#ifdef CONFIG_HARDWALL
3096 INF("hardwall", S_IRUGO, proc_pid_hardwall),
3097#endif
22d917d8
EB		 3098#ifdef CONFIG_USER_NS
3099 REG("uid_map", S_IRUGO|S_IWUSR, proc_uid_map_operations),
3100 REG("gid_map", S_IRUGO|S_IWUSR, proc_gid_map_operations),
3101#endif
28a6d671 3102};
1da177e4 3103
28a6d671 3104static int proc_tgid_base_readdir(struct file * filp,
1da177e4
LT		 3105 void * dirent, filldir_t filldir)
3106{
3107 return proc_pident_readdir(filp,dirent,filldir,
28a6d671 3108 tgid_base_stuff,ARRAY_SIZE(tgid_base_stuff));
1da177e4
LT		 3109}
3110
00977a59 3111static const struct file_operations proc_tgid_base_operations = {
1da177e4 3112 .read = generic_read_dir,
28a6d671 3113 .readdir = proc_tgid_base_readdir,
6038f373 3114 .llseek = default_llseek,
1da177e4
LT		 3115};
3116
28a6d671 3117static struct dentry *proc_tgid_base_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd){
7bcd6b0e
EB		 3118 return proc_pident_lookup(dir, dentry,
3119 tgid_base_stuff, ARRAY_SIZE(tgid_base_stuff));
1da177e4
LT		 3120}
3121
c5ef1c42 3122static const struct inode_operations proc_tgid_base_inode_operations = {
28a6d671 3123 .lookup = proc_tgid_base_lookup,
99f89551 3124 .getattr = pid_getattr,
6d76fa58 3125 .setattr = proc_setattr,
0499680a 3126 .permission = proc_pid_permission,
1da177e4 3127};
1da177e4 3128
60347f67 3129static void proc_flush_task_mnt(struct vfsmount *mnt, pid_t pid, pid_t tgid)
1da177e4 3130{
48e6484d 3131 struct dentry *dentry, *leader, *dir;
8578cea7 3132 char buf[PROC_NUMBUF];
48e6484d
EB		 3133 struct qstr name;
3134
3135 name.name = buf;
60347f67
PE		 3136 name.len = snprintf(buf, sizeof(buf), "%d", pid);
3137 dentry = d_hash_and_lookup(mnt->mnt_root, &name);
48e6484d 3138 if (dentry) {
29f12ca3 3139 shrink_dcache_parent(dentry);
48e6484d
EB		 3140 d_drop(dentry);
3141 dput(dentry);
3142 }
1da177e4 3143
48e6484d 3144 name.name = buf;
60347f67
PE		 3145 name.len = snprintf(buf, sizeof(buf), "%d", tgid);
3146 leader = d_hash_and_lookup(mnt->mnt_root, &name);
48e6484d
EB		 3147 if (!leader)
3148 goto out;
1da177e4 3149
48e6484d
EB		 3150 name.name = "task";
3151 name.len = strlen(name.name);
3152 dir = d_hash_and_lookup(leader, &name);
3153 if (!dir)
3154 goto out_put_leader;
3155
3156 name.name = buf;
60347f67 3157 name.len = snprintf(buf, sizeof(buf), "%d", pid);
48e6484d
EB		 3158 dentry = d_hash_and_lookup(dir, &name);
3159 if (dentry) {
3160 shrink_dcache_parent(dentry);
3161 d_drop(dentry);
3162 dput(dentry);
1da177e4 3163 }
48e6484d
EB		 3164
3165 dput(dir);
3166out_put_leader:
3167 dput(leader);
3168out:
3169 return;
1da177e4
LT		 3170}
3171
0895e91d
RD		 3172/**
3173 * proc_flush_task - Remove dcache entries for @task from the /proc dcache.
3174 * @task: task that should be flushed.
3175 *
3176 * When flushing dentries from proc, one needs to flush them from global
60347f67 3177 * proc (proc_mnt) and from all the namespaces' procs this task was seen
0895e91d
RD		 3178 * in. This call is supposed to do all of this job.
3179 *
3180 * Looks in the dcache for
3181 * /proc/@pid
3182 * /proc/@tgid/task/@pid
3183 * if either directory is present flushes it and all of it'ts children
3184 * from the dcache.
3185 *
3186 * It is safe and reasonable to cache /proc entries for a task until
3187 * that task exits. After that they just clog up the dcache with
3188 * useless entries, possibly causing useful dcache entries to be
3189 * flushed instead. This routine is proved to flush those useless
3190 * dcache entries at process exit time.
3191 *
3192 * NOTE: This routine is just an optimization so it does not guarantee
3193 * that no dcache entries will exist at process exit time it
3194 * just makes it very unlikely that any will persist.
60347f67
PE		 3195 */
3196
3197void proc_flush_task(struct task_struct *task)
3198{
9fcc2d15 3199 int i;
9b4d1cbe 3200 struct pid *pid, *tgid;
130f77ec
PE		 3201 struct upid *upid;
3202
130f77ec 3203 pid = task_pid(task);
9b4d1cbe 3204 tgid = task_tgid(task);
130f77ec 3205
9fcc2d15 3206 for (i = 0; i <= pid->level; i++) {
130f77ec
PE		 3207 upid = &pid->numbers[i];
3208 proc_flush_task_mnt(upid->ns->proc_mnt, upid->nr,
9b4d1cbe 3209 tgid->numbers[i].nr);
130f77ec 3210 }
6f4e6433
PE		 3211
3212 upid = &pid->numbers[pid->level];
3213 if (upid->nr == 1)
3214 pid_ns_release_proc(upid->ns);
60347f67
PE		 3215}
3216
9711ef99
AB		 3217static struct dentry *proc_pid_instantiate(struct inode *dir,
3218 struct dentry * dentry,
c5141e6d 3219 struct task_struct *task, const void *ptr)
444ceed8
EB		 3220{
3221 struct dentry *error = ERR_PTR(-ENOENT);
3222 struct inode *inode;
3223
61a28784 3224 inode = proc_pid_make_inode(dir->i_sb, task);
444ceed8
EB		 3225 if (!inode)
3226 goto out;
3227
3228 inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO;
3229 inode->i_op = &proc_tgid_base_inode_operations;
3230 inode->i_fop = &proc_tgid_base_operations;
3231 inode->i_flags|=S_IMMUTABLE;
aed54175 3232
bfe86848
MS		 3233 set_nlink(inode, 2 + pid_entry_count_dirs(tgid_base_stuff,
3234 ARRAY_SIZE(tgid_base_stuff)));
444ceed8 3235
fb045adb 3236 d_set_d_op(dentry, &pid_dentry_operations);
444ceed8
EB		 3237
3238 d_add(dentry, inode);
3239 /* Close the race of the process dying before we return the dentry */
3240 if (pid_revalidate(dentry, NULL))
3241 error = NULL;
3242out:
3243 return error;
3244}
3245
1da177e4
LT		 3246struct dentry *proc_pid_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd)
3247{
73d36460 3248 struct dentry *result;
1da177e4 3249 struct task_struct *task;
1da177e4 3250 unsigned tgid;
b488893a 3251 struct pid_namespace *ns;
1da177e4 3252
801199ce
EB		 3253 result = proc_base_lookup(dir, dentry);
3254 if (!IS_ERR(result) || PTR_ERR(result) != -ENOENT)
3255 goto out;
3256
1da177e4
LT		 3257 tgid = name_to_int(dentry);
3258 if (tgid == ~0U)
3259 goto out;
3260
b488893a 3261 ns = dentry->d_sb->s_fs_info;
de758734 3262 rcu_read_lock();
b488893a 3263 task = find_task_by_pid_ns(tgid, ns);
1da177e4
LT		 3264 if (task)
3265 get_task_struct(task);
de758734 3266 rcu_read_unlock();
1da177e4
LT		 3267 if (!task)
3268 goto out;
3269
444ceed8 3270 result = proc_pid_instantiate(dir, dentry, task, NULL);
1da177e4 3271 put_task_struct(task);
1da177e4 3272out:
cd6a3ce9 3273 return result;
1da177e4
LT		 3274}
3275
1da177e4 3276/*
0804ef4b 3277 * Find the first task with tgid >= tgid
0bc58a91 3278 *
1da177e4 3279 */
19fd4bb2
EB		 3280struct tgid_iter {
3281 unsigned int tgid;
0804ef4b 3282 struct task_struct *task;
19fd4bb2
EB		 3283};
3284static struct tgid_iter next_tgid(struct pid_namespace *ns, struct tgid_iter iter)
3285{
0804ef4b 3286 struct pid *pid;
1da177e4 3287
19fd4bb2
EB		 3288 if (iter.task)
3289 put_task_struct(iter.task);
454cc105 3290 rcu_read_lock();
0804ef4b 3291retry:
19fd4bb2
EB		 3292 iter.task = NULL;
3293 pid = find_ge_pid(iter.tgid, ns);
0804ef4b 3294 if (pid) {
19fd4bb2
EB		 3295 iter.tgid = pid_nr_ns(pid, ns);
3296 iter.task = pid_task(pid, PIDTYPE_PID);
0804ef4b
EB		 3297 /* What we to know is if the pid we have find is the
3298 * pid of a thread_group_leader. Testing for task
3299 * being a thread_group_leader is the obvious thing
3300 * todo but there is a window when it fails, due to
3301 * the pid transfer logic in de_thread.
3302 *
3303 * So we perform the straight forward test of seeing
3304 * if the pid we have found is the pid of a thread
3305 * group leader, and don't worry if the task we have
3306 * found doesn't happen to be a thread group leader.
3307 * As we don't care in the case of readdir.
3308 */
19fd4bb2
EB		 3309 if (!iter.task || !has_group_leader_pid(iter.task)) {
3310 iter.tgid += 1;
0804ef4b 3311 goto retry;
19fd4bb2
EB		 3312 }
3313 get_task_struct(iter.task);
0bc58a91 3314 }
454cc105 3315 rcu_read_unlock();
19fd4bb2 3316 return iter;
1da177e4
LT		 3317}
3318
7bcd6b0e 3319#define TGID_OFFSET (FIRST_PROCESS_ENTRY + ARRAY_SIZE(proc_base_stuff))
0804ef4b 3320
61a28784 3321static int proc_pid_fill_cache(struct file *filp, void *dirent, filldir_t filldir,
19fd4bb2 3322 struct tgid_iter iter)
61a28784
EB		 3323{
3324 char name[PROC_NUMBUF];
19fd4bb2 3325 int len = snprintf(name, sizeof(name), "%d", iter.tgid);
61a28784 3326 return proc_fill_cache(filp, dirent, filldir, name, len,
19fd4bb2 3327 proc_pid_instantiate, iter.task, NULL);
61a28784
EB		 3328}
3329
0499680a
VK		 3330static int fake_filldir(void *buf, const char *name, int namelen,
3331 loff_t offset, u64 ino, unsigned d_type)
3332{
3333 return 0;
3334}
3335
1da177e4
LT		 3336/* for the /proc/ directory itself, after non-process stuff has been done */
3337int proc_pid_readdir(struct file * filp, void * dirent, filldir_t filldir)
3338{
d8bdc59f
LT		 3339 unsigned int nr;
3340 struct task_struct *reaper;
19fd4bb2 3341 struct tgid_iter iter;
b488893a 3342 struct pid_namespace *ns;
0499680a 3343 filldir_t __filldir;
1da177e4 3344
d8bdc59f
LT		 3345 if (filp->f_pos >= PID_MAX_LIMIT + TGID_OFFSET)
3346 goto out_no_task;
3347 nr = filp->f_pos - FIRST_PROCESS_ENTRY;
3348
3349 reaper = get_proc_task(filp->f_path.dentry->d_inode);
61a28784
EB		 3350 if (!reaper)
3351 goto out_no_task;
3352
7bcd6b0e 3353 for (; nr < ARRAY_SIZE(proc_base_stuff); filp->f_pos++, nr++) {
c5141e6d 3354 const struct pid_entry *p = &proc_base_stuff[nr];
61a28784 3355 if (proc_base_fill_cache(filp, dirent, filldir, reaper, p) < 0)
801199ce 3356 goto out;
1da177e4
LT		 3357 }
3358
b488893a 3359 ns = filp->f_dentry->d_sb->s_fs_info;
19fd4bb2
EB		 3360 iter.task = NULL;
3361 iter.tgid = filp->f_pos - TGID_OFFSET;
3362 for (iter = next_tgid(ns, iter);
3363 iter.task;
3364 iter.tgid += 1, iter = next_tgid(ns, iter)) {
0499680a
VK		 3365 if (has_pid_permissions(ns, iter.task, 2))
3366 __filldir = filldir;
3367 else
3368 __filldir = fake_filldir;
3369
19fd4bb2 3370 filp->f_pos = iter.tgid + TGID_OFFSET;
0499680a 3371 if (proc_pid_fill_cache(filp, dirent, __filldir, iter) < 0) {
19fd4bb2 3372 put_task_struct(iter.task);
0804ef4b 3373 goto out;
1da177e4 3374 }
0bc58a91 3375 }
0804ef4b
EB		 3376 filp->f_pos = PID_MAX_LIMIT + TGID_OFFSET;
3377out:
61a28784
EB		 3378 put_task_struct(reaper);
3379out_no_task:
0bc58a91
EB		 3380 return 0;
3381}
1da177e4 3382
28a6d671
EB		 3383/*
3384 * Tasks
3385 */
c5141e6d 3386static const struct pid_entry tid_base_stuff[] = {
631f9c18 3387 DIR("fd", S_IRUSR|S_IXUSR, proc_fd_inode_operations, proc_fd_operations),
3835541d 3388 DIR("fdinfo", S_IRUSR|S_IXUSR, proc_fdinfo_inode_operations, proc_fdinfo_operations),
6b4e306a 3389 DIR("ns", S_IRUSR|S_IXUGO, proc_ns_dir_inode_operations, proc_ns_dir_operations),
631f9c18
AD		 3390 REG("environ", S_IRUSR, proc_environ_operations),
3391 INF("auxv", S_IRUSR, proc_pid_auxv),
3392 ONE("status", S_IRUGO, proc_pid_status),
a9712bc1 3393 ONE("personality", S_IRUGO, proc_pid_personality),
3036e7b4 3394 INF("limits", S_IRUGO, proc_pid_limits),
43ae34cb 3395#ifdef CONFIG_SCHED_DEBUG
631f9c18 3396 REG("sched", S_IRUGO|S_IWUSR, proc_pid_sched_operations),
ebcb6734 3397#endif
4614a696 3398 REG("comm", S_IRUGO|S_IWUSR, proc_pid_set_comm_operations),
ebcb6734 3399#ifdef CONFIG_HAVE_ARCH_TRACEHOOK
a9712bc1 3400 INF("syscall", S_IRUGO, proc_pid_syscall),
43ae34cb 3401#endif
631f9c18
AD		 3402 INF("cmdline", S_IRUGO, proc_pid_cmdline),
3403 ONE("stat", S_IRUGO, proc_tid_stat),
3404 ONE("statm", S_IRUGO, proc_pid_statm),
b7643757 3405 REG("maps", S_IRUGO, proc_tid_maps_operations),
28a6d671 3406#ifdef CONFIG_NUMA
b7643757 3407 REG("numa_maps", S_IRUGO, proc_tid_numa_maps_operations),
28a6d671 3408#endif
631f9c18
AD		 3409 REG("mem", S_IRUSR|S_IWUSR, proc_mem_operations),
3410 LNK("cwd", proc_cwd_link),
3411 LNK("root", proc_root_link),
3412 LNK("exe", proc_exe_link),
3413 REG("mounts", S_IRUGO, proc_mounts_operations),
3414 REG("mountinfo", S_IRUGO, proc_mountinfo_operations),
1e883281 3415#ifdef CONFIG_PROC_PAGE_MONITOR
631f9c18 3416 REG("clear_refs", S_IWUSR, proc_clear_refs_operations),
b7643757 3417 REG("smaps", S_IRUGO, proc_tid_smaps_operations),
ca6b0bf0 3418 REG("pagemap", S_IRUGO, proc_pagemap_operations),
28a6d671
EB		 3419#endif
3420#ifdef CONFIG_SECURITY
631f9c18 3421 DIR("attr", S_IRUGO|S_IXUGO, proc_attr_dir_inode_operations, proc_attr_dir_operations),
28a6d671
EB		 3422#endif
3423#ifdef CONFIG_KALLSYMS
631f9c18 3424 INF("wchan", S_IRUGO, proc_pid_wchan),
28a6d671 3425#endif
2ec220e2 3426#ifdef CONFIG_STACKTRACE
a9712bc1 3427 ONE("stack", S_IRUGO, proc_pid_stack),
28a6d671
EB		 3428#endif
3429#ifdef CONFIG_SCHEDSTATS
631f9c18 3430 INF("schedstat", S_IRUGO, proc_pid_schedstat),
28a6d671 3431#endif
9745512c 3432#ifdef CONFIG_LATENCYTOP
631f9c18 3433 REG("latency", S_IRUGO, proc_lstats_operations),
9745512c 3434#endif
8793d854 3435#ifdef CONFIG_PROC_PID_CPUSET
631f9c18 3436 REG("cpuset", S_IRUGO, proc_cpuset_operations),
a424316c
PM		 3437#endif
3438#ifdef CONFIG_CGROUPS
631f9c18 3439 REG("cgroup", S_IRUGO, proc_cgroup_operations),
28a6d671 3440#endif
631f9c18
AD		 3441 INF("oom_score", S_IRUGO, proc_oom_score),
3442 REG("oom_adj", S_IRUGO|S_IWUSR, proc_oom_adjust_operations),
a63d83f4 3443 REG("oom_score_adj", S_IRUGO|S_IWUSR, proc_oom_score_adj_operations),
28a6d671 3444#ifdef CONFIG_AUDITSYSCALL
631f9c18 3445 REG("loginuid", S_IWUSR|S_IRUGO, proc_loginuid_operations),
26ec3c64 3446 REG("sessionid", S_IRUGO, proc_sessionid_operations),
28a6d671 3447#endif
f4f154fd 3448#ifdef CONFIG_FAULT_INJECTION
631f9c18 3449 REG("make-it-fail", S_IRUGO|S_IWUSR, proc_fault_inject_operations),
f4f154fd 3450#endif
297c5d92 3451#ifdef CONFIG_TASK_IO_ACCOUNTING
1d1221f3 3452 INF("io", S_IRUSR, proc_tid_io_accounting),
297c5d92 3453#endif
f133ecca
CM		 3454#ifdef CONFIG_HARDWALL
3455 INF("hardwall", S_IRUGO, proc_pid_hardwall),
3456#endif
22d917d8
EB		 3457#ifdef CONFIG_USER_NS
3458 REG("uid_map", S_IRUGO|S_IWUSR, proc_uid_map_operations),
3459 REG("gid_map", S_IRUGO|S_IWUSR, proc_gid_map_operations),
3460#endif
28a6d671
EB		 3461};
3462
3463static int proc_tid_base_readdir(struct file * filp,
3464 void * dirent, filldir_t filldir)
3465{
3466 return proc_pident_readdir(filp,dirent,filldir,
3467 tid_base_stuff,ARRAY_SIZE(tid_base_stuff));
3468}
3469
3470static struct dentry *proc_tid_base_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd){
7bcd6b0e
EB		 3471 return proc_pident_lookup(dir, dentry,
3472 tid_base_stuff, ARRAY_SIZE(tid_base_stuff));
28a6d671
EB		 3473}
3474
00977a59 3475static const struct file_operations proc_tid_base_operations = {
28a6d671
EB		 3476 .read = generic_read_dir,
3477 .readdir = proc_tid_base_readdir,
6038f373 3478 .llseek = default_llseek,
28a6d671
EB		 3479};
3480
c5ef1c42 3481static const struct inode_operations proc_tid_base_inode_operations = {
28a6d671
EB		 3482 .lookup = proc_tid_base_lookup,
3483 .getattr = pid_getattr,
3484 .setattr = proc_setattr,
3485};
3486
444ceed8 3487static struct dentry *proc_task_instantiate(struct inode *dir,
c5141e6d 3488 struct dentry *dentry, struct task_struct *task, const void *ptr)
444ceed8
EB		 3489{
3490 struct dentry *error = ERR_PTR(-ENOENT);
3491 struct inode *inode;
61a28784 3492 inode = proc_pid_make_inode(dir->i_sb, task);
444ceed8
EB		 3493
3494 if (!inode)
3495 goto out;
3496 inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO;
3497 inode->i_op = &proc_tid_base_inode_operations;
3498 inode->i_fop = &proc_tid_base_operations;
3499 inode->i_flags|=S_IMMUTABLE;
aed54175 3500
bfe86848
MS		 3501 set_nlink(inode, 2 + pid_entry_count_dirs(tid_base_stuff,
3502 ARRAY_SIZE(tid_base_stuff)));
444ceed8 3503
fb045adb 3504 d_set_d_op(dentry, &pid_dentry_operations);
444ceed8
EB		 3505
3506 d_add(dentry, inode);
3507 /* Close the race of the process dying before we return the dentry */
3508 if (pid_revalidate(dentry, NULL))
3509 error = NULL;
3510out:
3511 return error;
3512}
3513
28a6d671
EB		 3514static struct dentry *proc_task_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd)
3515{
3516 struct dentry *result = ERR_PTR(-ENOENT);
3517 struct task_struct *task;
3518 struct task_struct *leader = get_proc_task(dir);
28a6d671 3519 unsigned tid;
b488893a 3520 struct pid_namespace *ns;
28a6d671
EB		 3521
3522 if (!leader)
3523 goto out_no_task;
3524
3525 tid = name_to_int(dentry);
3526 if (tid == ~0U)
3527 goto out;
3528
b488893a 3529 ns = dentry->d_sb->s_fs_info;
28a6d671 3530 rcu_read_lock();
b488893a 3531 task = find_task_by_pid_ns(tid, ns);
28a6d671
EB		 3532 if (task)
3533 get_task_struct(task);
3534 rcu_read_unlock();
3535 if (!task)
3536 goto out;
bac0abd6 3537 if (!same_thread_group(leader, task))
28a6d671
EB		 3538 goto out_drop_task;
3539
444ceed8 3540 result = proc_task_instantiate(dir, dentry, task, NULL);
28a6d671
EB		 3541out_drop_task:
3542 put_task_struct(task);
3543out:
3544 put_task_struct(leader);
3545out_no_task:
3546 return result;
3547}
3548
0bc58a91
EB		 3549/*
3550 * Find the first tid of a thread group to return to user space.
3551 *
3552 * Usually this is just the thread group leader, but if the users
3553 * buffer was too small or there was a seek into the middle of the
3554 * directory we have more work todo.
3555 *
3556 * In the case of a short read we start with find_task_by_pid.
3557 *
3558 * In the case of a seek we start with the leader and walk nr
3559 * threads past it.
3560 */
cc288738 3561static struct task_struct *first_tid(struct task_struct *leader,
b488893a 3562 int tid, int nr, struct pid_namespace *ns)
0bc58a91 3563{
a872ff0c 3564 struct task_struct *pos;
1da177e4 3565
cc288738 3566 rcu_read_lock();
0bc58a91
EB		 3567 /* Attempt to start with the pid of a thread */
3568 if (tid && (nr > 0)) {
b488893a 3569 pos = find_task_by_pid_ns(tid, ns);
a872ff0c
ON		 3570 if (pos && (pos->group_leader == leader))
3571 goto found;
0bc58a91 3572 }
1da177e4 3573
0bc58a91 3574 /* If nr exceeds the number of threads there is nothing todo */
a872ff0c
ON		 3575 pos = NULL;
3576 if (nr && nr >= get_nr_threads(leader))
3577 goto out;
1da177e4 3578
a872ff0c
ON		 3579 /* If we haven't found our starting place yet start
3580 * with the leader and walk nr threads forward.
0bc58a91 3581 */
a872ff0c
ON		 3582 for (pos = leader; nr > 0; --nr) {
3583 pos = next_thread(pos);
3584 if (pos == leader) {
3585 pos = NULL;
3586 goto out;
3587 }
1da177e4 3588 }
a872ff0c
ON		 3589found:
3590 get_task_struct(pos);
3591out:
cc288738 3592 rcu_read_unlock();
0bc58a91
EB		 3593 return pos;
3594}
3595
3596/*
3597 * Find the next thread in the thread list.
3598 * Return NULL if there is an error or no next thread.
3599 *
3600 * The reference to the input task_struct is released.
3601 */
3602static struct task_struct *next_tid(struct task_struct *start)
3603{
c1df7fb8 3604 struct task_struct *pos = NULL;
cc288738 3605 rcu_read_lock();
c1df7fb8 3606 if (pid_alive(start)) {
0bc58a91 3607 pos = next_thread(start);
c1df7fb8
ON		 3608 if (thread_group_leader(pos))
3609 pos = NULL;
3610 else
3611 get_task_struct(pos);
3612 }
cc288738 3613 rcu_read_unlock();
0bc58a91
EB		 3614 put_task_struct(start);
3615 return pos;
1da177e4
LT		 3616}
3617
61a28784
EB		 3618static int proc_task_fill_cache(struct file *filp, void *dirent, filldir_t filldir,
3619 struct task_struct *task, int tid)
3620{
3621 char name[PROC_NUMBUF];
3622 int len = snprintf(name, sizeof(name), "%d", tid);
3623 return proc_fill_cache(filp, dirent, filldir, name, len,
3624 proc_task_instantiate, task, NULL);
3625}
3626
1da177e4
LT		 3627/* for the /proc/TGID/task/ directories */
3628static int proc_task_readdir(struct file * filp, void * dirent, filldir_t filldir)
3629{
2fddfeef 3630 struct dentry *dentry = filp->f_path.dentry;
1da177e4 3631 struct inode *inode = dentry->d_inode;
7d895244 3632 struct task_struct *leader = NULL;
0bc58a91 3633 struct task_struct *task;
1da177e4
LT		 3634 int retval = -ENOENT;
3635 ino_t ino;
0bc58a91 3636 int tid;
b488893a 3637 struct pid_namespace *ns;
1da177e4 3638
7d895244
GC		 3639 task = get_proc_task(inode);
3640 if (!task)
3641 goto out_no_task;
3642 rcu_read_lock();
3643 if (pid_alive(task)) {
3644 leader = task->group_leader;
3645 get_task_struct(leader);
3646 }
3647 rcu_read_unlock();
3648 put_task_struct(task);
99f89551
EB		 3649 if (!leader)
3650 goto out_no_task;
1da177e4
LT		 3651 retval = 0;
3652
ee568b25 3653 switch ((unsigned long)filp->f_pos) {
1da177e4
LT		 3654 case 0:
3655 ino = inode->i_ino;
ee6f779b 3656 if (filldir(dirent, ".", 1, filp->f_pos, ino, DT_DIR) < 0)
1da177e4 3657 goto out;
ee6f779b 3658 filp->f_pos++;
1da177e4
LT		 3659 /* fall through */
3660 case 1:
3661 ino = parent_ino(dentry);
ee6f779b 3662 if (filldir(dirent, "..", 2, filp->f_pos, ino, DT_DIR) < 0)
1da177e4 3663 goto out;
ee6f779b 3664 filp->f_pos++;
1da177e4
LT		 3665 /* fall through */
3666 }
3667
0bc58a91
EB		 3668 /* f_version caches the tgid value that the last readdir call couldn't
3669 * return. lseek aka telldir automagically resets f_version to 0.
3670 */
b488893a 3671 ns = filp->f_dentry->d_sb->s_fs_info;
2b47c361 3672 tid = (int)filp->f_version;
0bc58a91 3673 filp->f_version = 0;
ee6f779b 3674 for (task = first_tid(leader, tid, filp->f_pos - 2, ns);
0bc58a91 3675 task;
ee6f779b 3676 task = next_tid(task), filp->f_pos++) {
b488893a 3677 tid = task_pid_nr_ns(task, ns);
61a28784 3678 if (proc_task_fill_cache(filp, dirent, filldir, task, tid) < 0) {
0bc58a91
EB		 3679 /* returning this tgid failed, save it as the first
3680 * pid for the next readir call */
2b47c361 3681 filp->f_version = (u64)tid;
0bc58a91 3682 put_task_struct(task);
1da177e4 3683 break;
0bc58a91 3684 }
1da177e4
LT		 3685 }
3686out:
99f89551
EB		 3687 put_task_struct(leader);
3688out_no_task:
1da177e4
LT		 3689 return retval;
3690}
6e66b52b
EB		 3691
3692static int proc_task_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
3693{
3694 struct inode *inode = dentry->d_inode;
99f89551 3695 struct task_struct *p = get_proc_task(inode);
6e66b52b
EB		 3696 generic_fillattr(inode, stat);
3697
99f89551 3698 if (p) {
99f89551 3699 stat->nlink += get_nr_threads(p);
99f89551 3700 put_task_struct(p);
6e66b52b
EB		 3701 }
3702
3703 return 0;
3704}
28a6d671 3705
c5ef1c42 3706static const struct inode_operations proc_task_inode_operations = {
28a6d671
EB		 3707 .lookup = proc_task_lookup,
3708 .getattr = proc_task_getattr,
3709 .setattr = proc_setattr,
0499680a 3710 .permission = proc_pid_permission,
28a6d671
EB		 3711};
3712
00977a59 3713static const struct file_operations proc_task_operations = {
28a6d671
EB		 3714 .read = generic_read_dir,
3715 .readdir = proc_task_readdir,
6038f373 3716 .llseek = default_llseek,
28a6d671 3717};
Linux kernel - Deliverables
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