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Merge tag 'timer' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc
[deliverable/linux.git] / fs / proc / base.c
CommitLineData
1da177e4
LT		 1/*
2 * linux/fs/proc/base.c
3 *
4 * Copyright (C) 1991, 1992 Linus Torvalds
5 *
6 * proc base directory handling functions
7 *
8 * 1999, Al Viro. Rewritten. Now it covers the whole per-process part.
9 * Instead of using magical inumbers to determine the kind of object
10 * we allocate and fill in-core inodes upon lookup. They don't even
11 * go into icache. We cache the reference to task_struct upon lookup too.
12 * Eventually it should become a filesystem in its own. We don't use the
13 * rest of procfs anymore.
e070ad49
ML		 14 *
15 *
16 * Changelog:
17 * 17-Jan-2005
18 * Allan Bezerra
19 * Bruna Moreira <bruna.moreira@indt.org.br>
20 * Edjard Mota <edjard.mota@indt.org.br>
21 * Ilias Biris <ilias.biris@indt.org.br>
22 * Mauricio Lin <mauricio.lin@indt.org.br>
23 *
24 * Embedded Linux Lab - 10LE Instituto Nokia de Tecnologia - INdT
25 *
26 * A new process specific entry (smaps) included in /proc. It shows the
27 * size of rss for each memory area. The maps entry lacks information
28 * about physical memory size (rss) for each mapped file, i.e.,
29 * rss information for executables and library files.
30 * This additional information is useful for any tools that need to know
31 * about physical memory consumption for a process specific library.
32 *
33 * Changelog:
34 * 21-Feb-2005
35 * Embedded Linux Lab - 10LE Instituto Nokia de Tecnologia - INdT
36 * Pud inclusion in the page table walking.
37 *
38 * ChangeLog:
39 * 10-Mar-2005
40 * 10LE Instituto Nokia de Tecnologia - INdT:
41 * A better way to walks through the page table as suggested by Hugh Dickins.
42 *
43 * Simo Piiroinen <simo.piiroinen@nokia.com>:
44 * Smaps information related to shared, private, clean and dirty pages.
45 *
46 * Paul Mundt <paul.mundt@nokia.com>:
47 * Overall revision about smaps.
1da177e4
LT		 48 */
49
50#include <asm/uaccess.h>
51
1da177e4
LT		 52#include <linux/errno.h>
53#include <linux/time.h>
54#include <linux/proc_fs.h>
55#include <linux/stat.h>
5995477a 56#include <linux/task_io_accounting_ops.h>
1da177e4 57#include <linux/init.h>
16f7e0fe 58#include <linux/capability.h>
1da177e4 59#include <linux/file.h>
9f3acc31 60#include <linux/fdtable.h>
1da177e4
LT		 61#include <linux/string.h>
62#include <linux/seq_file.h>
63#include <linux/namei.h>
6b3286ed 64#include <linux/mnt_namespace.h>
1da177e4 65#include <linux/mm.h>
a63d83f4 66#include <linux/swap.h>
b835996f 67#include <linux/rcupdate.h>
1da177e4 68#include <linux/kallsyms.h>
2ec220e2 69#include <linux/stacktrace.h>
d85f50d5 70#include <linux/resource.h>
5096add8 71#include <linux/module.h>
1da177e4
LT		 72#include <linux/mount.h>
73#include <linux/security.h>
74#include <linux/ptrace.h>
0d094efe 75#include <linux/tracehook.h>
a424316c 76#include <linux/cgroup.h>
1da177e4
LT		 77#include <linux/cpuset.h>
78#include <linux/audit.h>
5addc5dd 79#include <linux/poll.h>
1651e14e 80#include <linux/nsproxy.h>
8ac773b4 81#include <linux/oom.h>
3cb4a0bb 82#include <linux/elf.h>
60347f67 83#include <linux/pid_namespace.h>
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
1da177e4
LT		 202static int proc_pid_cmdline(struct task_struct *task, char * buffer)
203{
204 int res = 0;
205 unsigned int len;
206 struct mm_struct *mm = get_task_mm(task);
207 if (!mm)
208 goto out;
209 if (!mm->arg_end)
210 goto out_mm; /* Shh! No looking before we're done */
211
212 len = mm->arg_end - mm->arg_start;
213
214 if (len > PAGE_SIZE)
215 len = PAGE_SIZE;
216
217 res = access_process_vm(task, mm->arg_start, buffer, len, 0);
218
219 // If the nul at the end of args has been overwritten, then
220 // assume application is using setproctitle(3).
221 if (res > 0 && buffer[res-1] != '\0' && len < PAGE_SIZE) {
222 len = strnlen(buffer, res);
223 if (len < res) {
224 res = len;
225 } else {
226 len = mm->env_end - mm->env_start;
227 if (len > PAGE_SIZE - res)
228 len = PAGE_SIZE - res;
229 res += access_process_vm(task, mm->env_start, buffer+res, len, 0);
230 res = strnlen(buffer, res);
231 }
232 }
233out_mm:
234 mmput(mm);
235out:
236 return res;
237}
238
239static int proc_pid_auxv(struct task_struct *task, char *buffer)
240{
e7dcd999 241 struct mm_struct *mm = mm_access(task, PTRACE_MODE_READ);
2fadaef4
AV		 242 int res = PTR_ERR(mm);
243 if (mm && !IS_ERR(mm)) {
1da177e4 244 unsigned int nwords = 0;
dfe6b7d9 245 do {
1da177e4 246 nwords += 2;
dfe6b7d9 247 } while (mm->saved_auxv[nwords - 2] != 0); /* AT_NULL */
1da177e4
LT		 248 res = nwords * sizeof(mm->saved_auxv[0]);
249 if (res > PAGE_SIZE)
250 res = PAGE_SIZE;
251 memcpy(buffer, mm->saved_auxv, res);
252 mmput(mm);
253 }
254 return res;
255}
256
257
258#ifdef CONFIG_KALLSYMS
259/*
260 * Provides a wchan file via kallsyms in a proper one-value-per-file format.
261 * Returns the resolved symbol. If that fails, simply return the address.
262 */
263static int proc_pid_wchan(struct task_struct *task, char *buffer)
264{
ffb45122 265 unsigned long wchan;
9281acea 266 char symname[KSYM_NAME_LEN];
1da177e4
LT		 267
268 wchan = get_wchan(task);
269
9d65cb4a 270 if (lookup_symbol_name(wchan, symname) < 0)
f83ce3e6
JE		 271 if (!ptrace_may_access(task, PTRACE_MODE_READ))
272 return 0;
273 else
274 return sprintf(buffer, "%lu", wchan);
9d65cb4a
AD		 275 else
276 return sprintf(buffer, "%s", symname);
1da177e4
LT		 277}
278#endif /* CONFIG_KALLSYMS */
279
a9712bc1
AV		 280static int lock_trace(struct task_struct *task)
281{
282 int err = mutex_lock_killable(&task->signal->cred_guard_mutex);
283 if (err)
284 return err;
285 if (!ptrace_may_access(task, PTRACE_MODE_ATTACH)) {
286 mutex_unlock(&task->signal->cred_guard_mutex);
287 return -EPERM;
288 }
289 return 0;
290}
291
292static void unlock_trace(struct task_struct *task)
293{
294 mutex_unlock(&task->signal->cred_guard_mutex);
295}
296
2ec220e2
KC		 297#ifdef CONFIG_STACKTRACE
298
299#define MAX_STACK_TRACE_DEPTH 64
300
301static int proc_pid_stack(struct seq_file *m, struct pid_namespace *ns,
302 struct pid *pid, struct task_struct *task)
303{
304 struct stack_trace trace;
305 unsigned long *entries;
a9712bc1 306 int err;
2ec220e2
KC		 307 int i;
308
309 entries = kmalloc(MAX_STACK_TRACE_DEPTH * sizeof(*entries), GFP_KERNEL);
310 if (!entries)
311 return -ENOMEM;
312
313 trace.nr_entries = 0;
314 trace.max_entries = MAX_STACK_TRACE_DEPTH;
315 trace.entries = entries;
316 trace.skip = 0;
2ec220e2 317
a9712bc1
AV		 318 err = lock_trace(task);
319 if (!err) {
320 save_stack_trace_tsk(task, &trace);
321
322 for (i = 0; i < trace.nr_entries; i++) {
b81a618d 323 seq_printf(m, "[<%pK>] %pS\n",
a9712bc1
AV		 324 (void *)entries[i], (void *)entries[i]);
325 }
326 unlock_trace(task);
2ec220e2
KC		 327 }
328 kfree(entries);
329
a9712bc1 330 return err;
2ec220e2
KC		 331}
332#endif
333
1da177e4
LT		 334#ifdef CONFIG_SCHEDSTATS
335/*
336 * Provides /proc/PID/schedstat
337 */
338static int proc_pid_schedstat(struct task_struct *task, char *buffer)
339{
172ba844 340 return sprintf(buffer, "%llu %llu %lu\n",
826e08b0
IM		 341 (unsigned long long)task->se.sum_exec_runtime,
342 (unsigned long long)task->sched_info.run_delay,
2d72376b 343 task->sched_info.pcount);
1da177e4
LT		 344}
345#endif
346
9745512c
AV		 347#ifdef CONFIG_LATENCYTOP
348static int lstats_show_proc(struct seq_file *m, void *v)
349{
350 int i;
13d77c37
HS		 351 struct inode *inode = m->private;
352 struct task_struct *task = get_proc_task(inode);
9745512c 353
13d77c37
HS		 354 if (!task)
355 return -ESRCH;
356 seq_puts(m, "Latency Top version : v0.1\n");
9745512c 357 for (i = 0; i < 32; i++) {
34e49d4f
JP		 358 struct latency_record *lr = &task->latency_record[i];
359 if (lr->backtrace[0]) {
9745512c 360 int q;
34e49d4f
JP		 361 seq_printf(m, "%i %li %li",
362 lr->count, lr->time, lr->max);
9745512c 363 for (q = 0; q < LT_BACKTRACEDEPTH; q++) {
34e49d4f
JP		 364 unsigned long bt = lr->backtrace[q];
365 if (!bt)
9745512c 366 break;
34e49d4f 367 if (bt == ULONG_MAX)
9745512c 368 break;
34e49d4f 369 seq_printf(m, " %ps", (void *)bt);
9745512c 370 }
9d6de12f 371 seq_putc(m, '\n');
9745512c
AV		 372 }
373
374 }
13d77c37 375 put_task_struct(task);
9745512c
AV		 376 return 0;
377}
378
379static int lstats_open(struct inode *inode, struct file *file)
380{
13d77c37 381 return single_open(file, lstats_show_proc, inode);
d6643d12
HS		 382}
383
9745512c
AV		 384static ssize_t lstats_write(struct file *file, const char __user *buf,
385 size_t count, loff_t *offs)
386{
13d77c37 387 struct task_struct *task = get_proc_task(file->f_dentry->d_inode);
9745512c 388
13d77c37
HS		 389 if (!task)
390 return -ESRCH;
9745512c 391 clear_all_latency_tracing(task);
13d77c37 392 put_task_struct(task);
9745512c
AV		 393
394 return count;
395}
396
397static const struct file_operations proc_lstats_operations = {
398 .open = lstats_open,
399 .read = seq_read,
400 .write = lstats_write,
401 .llseek = seq_lseek,
13d77c37 402 .release = single_release,
9745512c
AV		 403};
404
405#endif
406
1da177e4
LT		 407static int proc_oom_score(struct task_struct *task, char *buffer)
408{
a7f638f9 409 unsigned long totalpages = totalram_pages + total_swap_pages;
b95c35e7 410 unsigned long points = 0;
1da177e4 411
19c5d45a 412 read_lock(&tasklist_lock);
b95c35e7 413 if (pid_alive(task))
a7f638f9
DR		 414 points = oom_badness(task, NULL, NULL, totalpages) *
415 1000 / totalpages;
19c5d45a 416 read_unlock(&tasklist_lock);
1da177e4
LT		 417 return sprintf(buffer, "%lu\n", points);
418}
419
d85f50d5
NH		 420struct limit_names {
421 char *name;
422 char *unit;
423};
424
425static const struct limit_names lnames[RLIM_NLIMITS] = {
cff4edb5 426 [RLIMIT_CPU] = {"Max cpu time", "seconds"},
d85f50d5
NH		 427 [RLIMIT_FSIZE] = {"Max file size", "bytes"},
428 [RLIMIT_DATA] = {"Max data size", "bytes"},
429 [RLIMIT_STACK] = {"Max stack size", "bytes"},
430 [RLIMIT_CORE] = {"Max core file size", "bytes"},
431 [RLIMIT_RSS] = {"Max resident set", "bytes"},
432 [RLIMIT_NPROC] = {"Max processes", "processes"},
433 [RLIMIT_NOFILE] = {"Max open files", "files"},
434 [RLIMIT_MEMLOCK] = {"Max locked memory", "bytes"},
435 [RLIMIT_AS] = {"Max address space", "bytes"},
436 [RLIMIT_LOCKS] = {"Max file locks", "locks"},
437 [RLIMIT_SIGPENDING] = {"Max pending signals", "signals"},
438 [RLIMIT_MSGQUEUE] = {"Max msgqueue size", "bytes"},
439 [RLIMIT_NICE] = {"Max nice priority", NULL},
440 [RLIMIT_RTPRIO] = {"Max realtime priority", NULL},
8808117c 441 [RLIMIT_RTTIME] = {"Max realtime timeout", "us"},
d85f50d5
NH		 442};
443
444/* Display limits for a process */
445static int proc_pid_limits(struct task_struct *task, char *buffer)
446{
447 unsigned int i;
448 int count = 0;
449 unsigned long flags;
450 char *bufptr = buffer;
451
452 struct rlimit rlim[RLIM_NLIMITS];
453
a6bebbc8 454 if (!lock_task_sighand(task, &flags))
d85f50d5 455 return 0;
d85f50d5
NH		 456 memcpy(rlim, task->signal->rlim, sizeof(struct rlimit) * RLIM_NLIMITS);
457 unlock_task_sighand(task, &flags);
d85f50d5
NH		 458
459 /*
460 * print the file header
461 */
462 count += sprintf(&bufptr[count], "%-25s %-20s %-20s %-10s\n",
463 "Limit", "Soft Limit", "Hard Limit", "Units");
464
465 for (i = 0; i < RLIM_NLIMITS; i++) {
466 if (rlim[i].rlim_cur == RLIM_INFINITY)
467 count += sprintf(&bufptr[count], "%-25s %-20s ",
468 lnames[i].name, "unlimited");
469 else
470 count += sprintf(&bufptr[count], "%-25s %-20lu ",
471 lnames[i].name, rlim[i].rlim_cur);
472
473 if (rlim[i].rlim_max == RLIM_INFINITY)
474 count += sprintf(&bufptr[count], "%-20s ", "unlimited");
475 else
476 count += sprintf(&bufptr[count], "%-20lu ",
477 rlim[i].rlim_max);
478
479 if (lnames[i].unit)
480 count += sprintf(&bufptr[count], "%-10s\n",
481 lnames[i].unit);
482 else
483 count += sprintf(&bufptr[count], "\n");
484 }
485
486 return count;
487}
488
ebcb6734
RM		 489#ifdef CONFIG_HAVE_ARCH_TRACEHOOK
490static int proc_pid_syscall(struct task_struct *task, char *buffer)
491{
492 long nr;
493 unsigned long args[6], sp, pc;
a9712bc1
AV		 494 int res = lock_trace(task);
495 if (res)
496 return res;
ebcb6734
RM		 497
498 if (task_current_syscall(task, &nr, args, 6, &sp, &pc))
a9712bc1
AV		 499 res = sprintf(buffer, "running\n");
500 else if (nr < 0)
501 res = sprintf(buffer, "%ld 0x%lx 0x%lx\n", nr, sp, pc);
502 else
503 res = sprintf(buffer,
ebcb6734
RM		 504 "%ld 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx\n",
505 nr,
506 args[0], args[1], args[2], args[3], args[4], args[5],
507 sp, pc);
a9712bc1
AV		 508 unlock_trace(task);
509 return res;
ebcb6734
RM		 510}
511#endif /* CONFIG_HAVE_ARCH_TRACEHOOK */
512
1da177e4
LT		 513/************************************************************************/
514/* Here the fs part begins */
515/************************************************************************/
516
517/* permission checks */
778c1144 518static int proc_fd_access_allowed(struct inode *inode)
1da177e4 519{
778c1144
EB		 520 struct task_struct *task;
521 int allowed = 0;
df26c40e
EB		 522 /* Allow access to a task's file descriptors if it is us or we
523 * may use ptrace attach to the process and find out that
524 * information.
778c1144
EB		 525 */
526 task = get_proc_task(inode);
df26c40e 527 if (task) {
006ebb40 528 allowed = ptrace_may_access(task, PTRACE_MODE_READ);
778c1144 529 put_task_struct(task);
df26c40e 530 }
778c1144 531 return allowed;
1da177e4
LT		 532}
533
6b4e306a 534int proc_setattr(struct dentry *dentry, struct iattr *attr)
6d76fa58
LT		 535{
536 int error;
537 struct inode *inode = dentry->d_inode;
538
539 if (attr->ia_valid & ATTR_MODE)
540 return -EPERM;
541
542 error = inode_change_ok(inode, attr);
1025774c
CH		 543 if (error)
544 return error;
545
546 if ((attr->ia_valid & ATTR_SIZE) &&
547 attr->ia_size != i_size_read(inode)) {
548 error = vmtruncate(inode, attr->ia_size);
549 if (error)
550 return error;
551 }
552
553 setattr_copy(inode, attr);
554 mark_inode_dirty(inode);
555 return 0;
6d76fa58
LT		 556}
557
0499680a
VK		 558/*
559 * May current process learn task's sched/cmdline info (for hide_pid_min=1)
560 * or euid/egid (for hide_pid_min=2)?
561 */
562static bool has_pid_permissions(struct pid_namespace *pid,
563 struct task_struct *task,
564 int hide_pid_min)
565{
566 if (pid->hide_pid < hide_pid_min)
567 return true;
568 if (in_group_p(pid->pid_gid))
569 return true;
570 return ptrace_may_access(task, PTRACE_MODE_READ);
571}
572
573
574static int proc_pid_permission(struct inode *inode, int mask)
575{
576 struct pid_namespace *pid = inode->i_sb->s_fs_info;
577 struct task_struct *task;
578 bool has_perms;
579
580 task = get_proc_task(inode);
a2ef990a
XF		 581 if (!task)
582 return -ESRCH;
0499680a
VK		 583 has_perms = has_pid_permissions(pid, task, 1);
584 put_task_struct(task);
585
586 if (!has_perms) {
587 if (pid->hide_pid == 2) {
588 /*
589 * Let's make getdents(), stat(), and open()
590 * consistent with each other. If a process
591 * may not stat() a file, it shouldn't be seen
592 * in procfs at all.
593 */
594 return -ENOENT;
595 }
596
597 return -EPERM;
598 }
599 return generic_permission(inode, mask);
600}
601
602
603
c5ef1c42 604static const struct inode_operations proc_def_inode_operations = {
6d76fa58
LT		 605 .setattr = proc_setattr,
606};
607
1da177e4
LT		 608#define PROC_BLOCK_SIZE (3*1024) /* 4K page size but our output routines use some slack for overruns */
609
610static ssize_t proc_info_read(struct file * file, char __user * buf,
611 size_t count, loff_t *ppos)
612{
2fddfeef 613 struct inode * inode = file->f_path.dentry->d_inode;
1da177e4
LT		 614 unsigned long page;
615 ssize_t length;
99f89551
EB		 616 struct task_struct *task = get_proc_task(inode);
617
618 length = -ESRCH;
619 if (!task)
620 goto out_no_task;
1da177e4
LT		 621
622 if (count > PROC_BLOCK_SIZE)
623 count = PROC_BLOCK_SIZE;
99f89551
EB		 624
625 length = -ENOMEM;
e12ba74d 626 if (!(page = __get_free_page(GFP_TEMPORARY)))
99f89551 627 goto out;
1da177e4
LT		 628
629 length = PROC_I(inode)->op.proc_read(task, (char*)page);
630
631 if (length >= 0)
632 length = simple_read_from_buffer(buf, count, ppos, (char *)page, length);
633 free_page(page);
99f89551
EB		 634out:
635 put_task_struct(task);
636out_no_task:
1da177e4
LT		 637 return length;
638}
639
00977a59 640static const struct file_operations proc_info_file_operations = {
1da177e4 641 .read = proc_info_read,
87df8424 642 .llseek = generic_file_llseek,
1da177e4
LT		 643};
644
be614086
EB		 645static int proc_single_show(struct seq_file *m, void *v)
646{
647 struct inode *inode = m->private;
648 struct pid_namespace *ns;
649 struct pid *pid;
650 struct task_struct *task;
651 int ret;
652
653 ns = inode->i_sb->s_fs_info;
654 pid = proc_pid(inode);
655 task = get_pid_task(pid, PIDTYPE_PID);
656 if (!task)
657 return -ESRCH;
658
659 ret = PROC_I(inode)->op.proc_show(m, ns, pid, task);
660
661 put_task_struct(task);
662 return ret;
663}
664
665static int proc_single_open(struct inode *inode, struct file *filp)
666{
c6a34058 667 return single_open(filp, proc_single_show, inode);
be614086
EB		 668}
669
670static const struct file_operations proc_single_file_operations = {
671 .open = proc_single_open,
672 .read = seq_read,
673 .llseek = seq_lseek,
674 .release = single_release,
675};
676
b409e578 677static int __mem_open(struct inode *inode, struct file *file, unsigned int mode)
1da177e4 678{
e268337d
LT		 679 struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode);
680 struct mm_struct *mm;
681
682 if (!task)
683 return -ESRCH;
684
b409e578 685 mm = mm_access(task, mode);
e268337d
LT		 686 put_task_struct(task);
687
688 if (IS_ERR(mm))
689 return PTR_ERR(mm);
690
6d08f2c7
ON		 691 if (mm) {
692 /* ensure this mm_struct can't be freed */
693 atomic_inc(&mm->mm_count);
694 /* but do not pin its memory */
695 mmput(mm);
696 }
697
4a3956c7
KH		 698 /* OK to pass negative loff_t, we can catch out-of-range */
699 file->f_mode |= FMODE_UNSIGNED_OFFSET;
e268337d
LT		 700 file->private_data = mm;
701
1da177e4
LT		 702 return 0;
703}
704
b409e578
CW		 705static int mem_open(struct inode *inode, struct file *file)
706{
707 return __mem_open(inode, file, PTRACE_MODE_ATTACH);
708}
709
572d34b9
ON		 710static ssize_t mem_rw(struct file *file, char __user *buf,
711 size_t count, loff_t *ppos, int write)
1da177e4 712{
e268337d 713 struct mm_struct *mm = file->private_data;
572d34b9
ON		 714 unsigned long addr = *ppos;
715 ssize_t copied;
1da177e4 716 char *page;
1da177e4 717
e268337d
LT		 718 if (!mm)
719 return 0;
99f89551 720
30cd8903
KM		 721 page = (char *)__get_free_page(GFP_TEMPORARY);
722 if (!page)
e268337d 723 return -ENOMEM;
1da177e4 724
f7ca54f4 725 copied = 0;
6d08f2c7
ON		 726 if (!atomic_inc_not_zero(&mm->mm_users))
727 goto free;
728
1da177e4 729 while (count > 0) {
572d34b9 730 int this_len = min_t(int, count, PAGE_SIZE);
1da177e4 731
572d34b9 732 if (write && copy_from_user(page, buf, this_len)) {
1da177e4
LT		 733 copied = -EFAULT;
734 break;
735 }
572d34b9
ON		 736
737 this_len = access_remote_vm(mm, addr, page, this_len, write);
738 if (!this_len) {
1da177e4
LT		 739 if (!copied)
740 copied = -EIO;
741 break;
742 }
572d34b9
ON		 743
744 if (!write && copy_to_user(buf, page, this_len)) {
745 copied = -EFAULT;
746 break;
747 }
748
749 buf += this_len;
750 addr += this_len;
751 copied += this_len;
752 count -= this_len;
1da177e4 753 }
572d34b9 754 *ppos = addr;
30cd8903 755
6d08f2c7
ON		 756 mmput(mm);
757free:
30cd8903 758 free_page((unsigned long) page);
1da177e4
LT		 759 return copied;
760}
1da177e4 761
572d34b9
ON		 762static ssize_t mem_read(struct file *file, char __user *buf,
763 size_t count, loff_t *ppos)
764{
765 return mem_rw(file, buf, count, ppos, 0);
766}
767
768static ssize_t mem_write(struct file *file, const char __user *buf,
769 size_t count, loff_t *ppos)
770{
771 return mem_rw(file, (char __user*)buf, count, ppos, 1);
772}
773
85863e47 774loff_t mem_lseek(struct file *file, loff_t offset, int orig)
1da177e4
LT		 775{
776 switch (orig) {
777 case 0:
778 file->f_pos = offset;
779 break;
780 case 1:
781 file->f_pos += offset;
782 break;
783 default:
784 return -EINVAL;
785 }
786 force_successful_syscall_return();
787 return file->f_pos;
788}
789
e268337d
LT		 790static int mem_release(struct inode *inode, struct file *file)
791{
792 struct mm_struct *mm = file->private_data;
71879d3c 793 if (mm)
6d08f2c7 794 mmdrop(mm);
e268337d
LT		 795 return 0;
796}
797
00977a59 798static const struct file_operations proc_mem_operations = {
1da177e4
LT		 799 .llseek = mem_lseek,
800 .read = mem_read,
801 .write = mem_write,
802 .open = mem_open,
e268337d 803 .release = mem_release,
1da177e4
LT		 804};
805
b409e578
CW		 806static int environ_open(struct inode *inode, struct file *file)
807{
808 return __mem_open(inode, file, PTRACE_MODE_READ);
809}
810
315e28c8
JP		 811static ssize_t environ_read(struct file *file, char __user *buf,
812 size_t count, loff_t *ppos)
813{
315e28c8
JP		 814 char *page;
815 unsigned long src = *ppos;
b409e578
CW		 816 int ret = 0;
817 struct mm_struct *mm = file->private_data;
315e28c8 818
b409e578
CW		 819 if (!mm)
820 return 0;
315e28c8 821
315e28c8
JP		 822 page = (char *)__get_free_page(GFP_TEMPORARY);
823 if (!page)
b409e578 824 return -ENOMEM;
315e28c8 825
d6f64b89 826 ret = 0;
b409e578
CW		 827 if (!atomic_inc_not_zero(&mm->mm_users))
828 goto free;
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
b409e578 840 retval = access_remote_vm(mm, (mm->env_start + src),
315e28c8
JP		 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;
315e28c8 859 mmput(mm);
b409e578
CW		 860
861free:
315e28c8 862 free_page((unsigned long) page);
315e28c8
JP		 863 return ret;
864}
865
866static const struct file_operations proc_environ_operations = {
b409e578 867 .open = environ_open,
315e28c8 868 .read = environ_read,
87df8424 869 .llseek = generic_file_llseek,
b409e578 870 .release = mem_release,
315e28c8
JP		 871};
872
1da177e4
LT		 873static ssize_t oom_adjust_read(struct file *file, char __user *buf,
874 size_t count, loff_t *ppos)
875{
2fddfeef 876 struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode);
8578cea7 877 char buffer[PROC_NUMBUF];
1da177e4 878 size_t len;
28b83c51
KM		 879 int oom_adjust = OOM_DISABLE;
880 unsigned long flags;
1da177e4 881
99f89551
EB		 882 if (!task)
883 return -ESRCH;
28b83c51
KM		 884
885 if (lock_task_sighand(task, &flags)) {
886 oom_adjust = task->signal->oom_adj;
887 unlock_task_sighand(task, &flags);
888 }
889
99f89551
EB		 890 put_task_struct(task);
891
8578cea7 892 len = snprintf(buffer, sizeof(buffer), "%i\n", oom_adjust);
0c28f287
AM		 893
894 return simple_read_from_buffer(buf, count, ppos, buffer, len);
1da177e4
LT		 895}
896
897static ssize_t oom_adjust_write(struct file *file, const char __user *buf,
898 size_t count, loff_t *ppos)
899{
99f89551 900 struct task_struct *task;
5d863b89 901 char buffer[PROC_NUMBUF];
0a8cb8e3 902 int oom_adjust;
28b83c51 903 unsigned long flags;
5d863b89 904 int err;
1da177e4 905
8578cea7
EB		 906 memset(buffer, 0, sizeof(buffer));
907 if (count > sizeof(buffer) - 1)
908 count = sizeof(buffer) - 1;
723548bf
DR		 909 if (copy_from_user(buffer, buf, count)) {
910 err = -EFAULT;
911 goto out;
912 }
5d863b89 913
0a8cb8e3 914 err = kstrtoint(strstrip(buffer), 0, &oom_adjust);
5d863b89 915 if (err)
723548bf 916 goto out;
8ac773b4 917 if ((oom_adjust < OOM_ADJUST_MIN || oom_adjust > OOM_ADJUST_MAX) &&
723548bf
DR		 918 oom_adjust != OOM_DISABLE) {
919 err = -EINVAL;
920 goto out;
921 }
5d863b89 922
2fddfeef 923 task = get_proc_task(file->f_path.dentry->d_inode);
723548bf
DR		 924 if (!task) {
925 err = -ESRCH;
926 goto out;
927 }
d19d5476
DR		 928
929 task_lock(task);
930 if (!task->mm) {
931 err = -EINVAL;
932 goto err_task_lock;
933 }
934
28b83c51 935 if (!lock_task_sighand(task, &flags)) {
723548bf 936 err = -ESRCH;
d19d5476 937 goto err_task_lock;
28b83c51
KM		 938 }
939
940 if (oom_adjust < task->signal->oom_adj && !capable(CAP_SYS_RESOURCE)) {
723548bf
DR		 941 err = -EACCES;
942 goto err_sighand;
8fb4fc68 943 }
28b83c51 944
51b1bd2a
DR		 945 /*
946 * Warn that /proc/pid/oom_adj is deprecated, see
947 * Documentation/feature-removal-schedule.txt.
948 */
c2142704 949 printk_once(KERN_WARNING "%s (%d): /proc/%d/oom_adj is deprecated, please use /proc/%d/oom_score_adj instead.\n",
be8f684d
DR		 950 current->comm, task_pid_nr(current), task_pid_nr(task),
951 task_pid_nr(task));
28b83c51 952 task->signal->oom_adj = oom_adjust;
a63d83f4
DR		 953 /*
954 * Scale /proc/pid/oom_score_adj appropriately ensuring that a maximum
955 * value is always attainable.
956 */
957 if (task->signal->oom_adj == OOM_ADJUST_MAX)
958 task->signal->oom_score_adj = OOM_SCORE_ADJ_MAX;
959 else
960 task->signal->oom_score_adj = (oom_adjust * OOM_SCORE_ADJ_MAX) /
961 -OOM_DISABLE;
43d2b113 962 trace_oom_score_adj_update(task);
723548bf 963err_sighand:
28b83c51 964 unlock_task_sighand(task, &flags);
d19d5476
DR		 965err_task_lock:
966 task_unlock(task);
99f89551 967 put_task_struct(task);
723548bf
DR		 968out:
969 return err < 0 ? err : count;
1da177e4
LT		 970}
971
00977a59 972static const struct file_operations proc_oom_adjust_operations = {
1da177e4
LT		 973 .read = oom_adjust_read,
974 .write = oom_adjust_write,
87df8424 975 .llseek = generic_file_llseek,
1da177e4
LT		 976};
977
a63d83f4
DR		 978static ssize_t oom_score_adj_read(struct file *file, char __user *buf,
979 size_t count, loff_t *ppos)
980{
981 struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode);
982 char buffer[PROC_NUMBUF];
983 int oom_score_adj = OOM_SCORE_ADJ_MIN;
984 unsigned long flags;
985 size_t len;
986
987 if (!task)
988 return -ESRCH;
989 if (lock_task_sighand(task, &flags)) {
990 oom_score_adj = task->signal->oom_score_adj;
991 unlock_task_sighand(task, &flags);
992 }
993 put_task_struct(task);
994 len = snprintf(buffer, sizeof(buffer), "%d\n", oom_score_adj);
995 return simple_read_from_buffer(buf, count, ppos, buffer, len);
996}
997
998static ssize_t oom_score_adj_write(struct file *file, const char __user *buf,
999 size_t count, loff_t *ppos)
1000{
1001 struct task_struct *task;
1002 char buffer[PROC_NUMBUF];
1003 unsigned long flags;
0a8cb8e3 1004 int oom_score_adj;
a63d83f4
DR		 1005 int err;
1006
1007 memset(buffer, 0, sizeof(buffer));
1008 if (count > sizeof(buffer) - 1)
1009 count = sizeof(buffer) - 1;
723548bf
DR		 1010 if (copy_from_user(buffer, buf, count)) {
1011 err = -EFAULT;
1012 goto out;
1013 }
a63d83f4 1014
0a8cb8e3 1015 err = kstrtoint(strstrip(buffer), 0, &oom_score_adj);
a63d83f4 1016 if (err)
723548bf 1017 goto out;
a63d83f4 1018 if (oom_score_adj < OOM_SCORE_ADJ_MIN ||
723548bf
DR		 1019 oom_score_adj > OOM_SCORE_ADJ_MAX) {
1020 err = -EINVAL;
1021 goto out;
1022 }
a63d83f4
DR		 1023
1024 task = get_proc_task(file->f_path.dentry->d_inode);
723548bf
DR		 1025 if (!task) {
1026 err = -ESRCH;
1027 goto out;
1028 }
d19d5476
DR		 1029
1030 task_lock(task);
1031 if (!task->mm) {
1032 err = -EINVAL;
1033 goto err_task_lock;
1034 }
1035
a63d83f4 1036 if (!lock_task_sighand(task, &flags)) {
723548bf 1037 err = -ESRCH;
d19d5476 1038 goto err_task_lock;
a63d83f4 1039 }
d19d5476 1040
dabb16f6 1041 if (oom_score_adj < task->signal->oom_score_adj_min &&
a63d83f4 1042 !capable(CAP_SYS_RESOURCE)) {
723548bf
DR		 1043 err = -EACCES;
1044 goto err_sighand;
a63d83f4
DR		 1045 }
1046
1047 task->signal->oom_score_adj = oom_score_adj;
dabb16f6
MSB		 1048 if (has_capability_noaudit(current, CAP_SYS_RESOURCE))
1049 task->signal->oom_score_adj_min = oom_score_adj;
43d2b113 1050 trace_oom_score_adj_update(task);
a63d83f4
DR		 1051 /*
1052 * Scale /proc/pid/oom_adj appropriately ensuring that OOM_DISABLE is
1053 * always attainable.
1054 */
1055 if (task->signal->oom_score_adj == OOM_SCORE_ADJ_MIN)
1056 task->signal->oom_adj = OOM_DISABLE;
1057 else
1058 task->signal->oom_adj = (oom_score_adj * OOM_ADJUST_MAX) /
1059 OOM_SCORE_ADJ_MAX;
723548bf 1060err_sighand:
a63d83f4 1061 unlock_task_sighand(task, &flags);
d19d5476
DR		 1062err_task_lock:
1063 task_unlock(task);
a63d83f4 1064 put_task_struct(task);
723548bf
DR		 1065out:
1066 return err < 0 ? err : count;
a63d83f4
DR		 1067}
1068
1069static const struct file_operations proc_oom_score_adj_operations = {
1070 .read = oom_score_adj_read,
1071 .write = oom_score_adj_write,
6038f373 1072 .llseek = default_llseek,
a63d83f4
DR		 1073};
1074
1da177e4
LT		 1075#ifdef CONFIG_AUDITSYSCALL
1076#define TMPBUFLEN 21
1077static ssize_t proc_loginuid_read(struct file * file, char __user * buf,
1078 size_t count, loff_t *ppos)
1079{
2fddfeef 1080 struct inode * inode = file->f_path.dentry->d_inode;
99f89551 1081 struct task_struct *task = get_proc_task(inode);
1da177e4
LT		 1082 ssize_t length;
1083 char tmpbuf[TMPBUFLEN];
1084
99f89551
EB		 1085 if (!task)
1086 return -ESRCH;
1da177e4 1087 length = scnprintf(tmpbuf, TMPBUFLEN, "%u",
0c11b942 1088 audit_get_loginuid(task));
99f89551 1089 put_task_struct(task);
1da177e4
LT		 1090 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1091}
1092
1093static ssize_t proc_loginuid_write(struct file * file, const char __user * buf,
1094 size_t count, loff_t *ppos)
1095{
2fddfeef 1096 struct inode * inode = file->f_path.dentry->d_inode;
1da177e4
LT		 1097 char *page, *tmp;
1098 ssize_t length;
1da177e4
LT		 1099 uid_t loginuid;
1100
7dc52157
PM		 1101 rcu_read_lock();
1102 if (current != pid_task(proc_pid(inode), PIDTYPE_PID)) {
1103 rcu_read_unlock();
1da177e4 1104 return -EPERM;
7dc52157
PM		 1105 }
1106 rcu_read_unlock();
1da177e4 1107
e0182909
AV		 1108 if (count >= PAGE_SIZE)
1109 count = PAGE_SIZE - 1;
1da177e4
LT		 1110
1111 if (*ppos != 0) {
1112 /* No partial writes. */
1113 return -EINVAL;
1114 }
e12ba74d 1115 page = (char*)__get_free_page(GFP_TEMPORARY);
1da177e4
LT		 1116 if (!page)
1117 return -ENOMEM;
1118 length = -EFAULT;
1119 if (copy_from_user(page, buf, count))
1120 goto out_free_page;
1121
e0182909 1122 page[count] = '\0';
1da177e4
LT		 1123 loginuid = simple_strtoul(page, &tmp, 10);
1124 if (tmp == page) {
1125 length = -EINVAL;
1126 goto out_free_page;
1127
1128 }
0a300be6 1129 length = audit_set_loginuid(loginuid);
1da177e4
LT		 1130 if (likely(length == 0))
1131 length = count;
1132
1133out_free_page:
1134 free_page((unsigned long) page);
1135 return length;
1136}
1137
00977a59 1138static const struct file_operations proc_loginuid_operations = {
1da177e4
LT		 1139 .read = proc_loginuid_read,
1140 .write = proc_loginuid_write,
87df8424 1141 .llseek = generic_file_llseek,
1da177e4 1142};
1e0bd755
EP		 1143
1144static ssize_t proc_sessionid_read(struct file * file, char __user * buf,
1145 size_t count, loff_t *ppos)
1146{
1147 struct inode * inode = file->f_path.dentry->d_inode;
1148 struct task_struct *task = get_proc_task(inode);
1149 ssize_t length;
1150 char tmpbuf[TMPBUFLEN];
1151
1152 if (!task)
1153 return -ESRCH;
1154 length = scnprintf(tmpbuf, TMPBUFLEN, "%u",
1155 audit_get_sessionid(task));
1156 put_task_struct(task);
1157 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1158}
1159
1160static const struct file_operations proc_sessionid_operations = {
1161 .read = proc_sessionid_read,
87df8424 1162 .llseek = generic_file_llseek,
1e0bd755 1163};
1da177e4
LT		 1164#endif
1165
f4f154fd
AM		 1166#ifdef CONFIG_FAULT_INJECTION
1167static ssize_t proc_fault_inject_read(struct file * file, char __user * buf,
1168 size_t count, loff_t *ppos)
1169{
1170 struct task_struct *task = get_proc_task(file->f_dentry->d_inode);
1171 char buffer[PROC_NUMBUF];
1172 size_t len;
1173 int make_it_fail;
f4f154fd
AM		 1174
1175 if (!task)
1176 return -ESRCH;
1177 make_it_fail = task->make_it_fail;
1178 put_task_struct(task);
1179
1180 len = snprintf(buffer, sizeof(buffer), "%i\n", make_it_fail);
0c28f287
AM		 1181
1182 return simple_read_from_buffer(buf, count, ppos, buffer, len);
f4f154fd
AM		 1183}
1184
1185static ssize_t proc_fault_inject_write(struct file * file,
1186 const char __user * buf, size_t count, loff_t *ppos)
1187{
1188 struct task_struct *task;
1189 char buffer[PROC_NUMBUF], *end;
1190 int make_it_fail;
1191
1192 if (!capable(CAP_SYS_RESOURCE))
1193 return -EPERM;
1194 memset(buffer, 0, sizeof(buffer));
1195 if (count > sizeof(buffer) - 1)
1196 count = sizeof(buffer) - 1;
1197 if (copy_from_user(buffer, buf, count))
1198 return -EFAULT;
cba8aafe
VL		 1199 make_it_fail = simple_strtol(strstrip(buffer), &end, 0);
1200 if (*end)
1201 return -EINVAL;
f4f154fd
AM		 1202 task = get_proc_task(file->f_dentry->d_inode);
1203 if (!task)
1204 return -ESRCH;
1205 task->make_it_fail = make_it_fail;
1206 put_task_struct(task);
cba8aafe
VL		 1207
1208 return count;
f4f154fd
AM		 1209}
1210
00977a59 1211static const struct file_operations proc_fault_inject_operations = {
f4f154fd
AM		 1212 .read = proc_fault_inject_read,
1213 .write = proc_fault_inject_write,
87df8424 1214 .llseek = generic_file_llseek,
f4f154fd
AM		 1215};
1216#endif
1217
9745512c 1218
43ae34cb
IM		 1219#ifdef CONFIG_SCHED_DEBUG
1220/*
1221 * Print out various scheduling related per-task fields:
1222 */
1223static int sched_show(struct seq_file *m, void *v)
1224{
1225 struct inode *inode = m->private;
1226 struct task_struct *p;
1227
43ae34cb
IM		 1228 p = get_proc_task(inode);
1229 if (!p)
1230 return -ESRCH;
1231 proc_sched_show_task(p, m);
1232
1233 put_task_struct(p);
1234
1235 return 0;
1236}
1237
1238static ssize_t
1239sched_write(struct file *file, const char __user *buf,
1240 size_t count, loff_t *offset)
1241{
1242 struct inode *inode = file->f_path.dentry->d_inode;
1243 struct task_struct *p;
1244
43ae34cb
IM		 1245 p = get_proc_task(inode);
1246 if (!p)
1247 return -ESRCH;
1248 proc_sched_set_task(p);
1249
1250 put_task_struct(p);
1251
1252 return count;
1253}
1254
1255static int sched_open(struct inode *inode, struct file *filp)
1256{
c6a34058 1257 return single_open(filp, sched_show, inode);
43ae34cb
IM		 1258}
1259
1260static const struct file_operations proc_pid_sched_operations = {
1261 .open = sched_open,
1262 .read = seq_read,
1263 .write = sched_write,
1264 .llseek = seq_lseek,
5ea473a1 1265 .release = single_release,
43ae34cb
IM		 1266};
1267
1268#endif
1269
5091faa4
MG		 1270#ifdef CONFIG_SCHED_AUTOGROUP
1271/*
1272 * Print out autogroup related information:
1273 */
1274static int sched_autogroup_show(struct seq_file *m, void *v)
1275{
1276 struct inode *inode = m->private;
1277 struct task_struct *p;
1278
1279 p = get_proc_task(inode);
1280 if (!p)
1281 return -ESRCH;
1282 proc_sched_autogroup_show_task(p, m);
1283
1284 put_task_struct(p);
1285
1286 return 0;
1287}
1288
1289static ssize_t
1290sched_autogroup_write(struct file *file, const char __user *buf,
1291 size_t count, loff_t *offset)
1292{
1293 struct inode *inode = file->f_path.dentry->d_inode;
1294 struct task_struct *p;
1295 char buffer[PROC_NUMBUF];
0a8cb8e3 1296 int nice;
5091faa4
MG		 1297 int err;
1298
1299 memset(buffer, 0, sizeof(buffer));
1300 if (count > sizeof(buffer) - 1)
1301 count = sizeof(buffer) - 1;
1302 if (copy_from_user(buffer, buf, count))
1303 return -EFAULT;
1304
0a8cb8e3
AD		 1305 err = kstrtoint(strstrip(buffer), 0, &nice);
1306 if (err < 0)
1307 return err;
5091faa4
MG		 1308
1309 p = get_proc_task(inode);
1310 if (!p)
1311 return -ESRCH;
1312
2e5b5b3a 1313 err = proc_sched_autogroup_set_nice(p, nice);
5091faa4
MG		 1314 if (err)
1315 count = err;
1316
1317 put_task_struct(p);
1318
1319 return count;
1320}
1321
1322static int sched_autogroup_open(struct inode *inode, struct file *filp)
1323{
1324 int ret;
1325
1326 ret = single_open(filp, sched_autogroup_show, NULL);
1327 if (!ret) {
1328 struct seq_file *m = filp->private_data;
1329
1330 m->private = inode;
1331 }
1332 return ret;
1333}
1334
1335static const struct file_operations proc_pid_sched_autogroup_operations = {
1336 .open = sched_autogroup_open,
1337 .read = seq_read,
1338 .write = sched_autogroup_write,
1339 .llseek = seq_lseek,
1340 .release = single_release,
1341};
1342
1343#endif /* CONFIG_SCHED_AUTOGROUP */
1344
4614a696 1345static ssize_t comm_write(struct file *file, const char __user *buf,
1346 size_t count, loff_t *offset)
1347{
1348 struct inode *inode = file->f_path.dentry->d_inode;
1349 struct task_struct *p;
1350 char buffer[TASK_COMM_LEN];
1351
1352 memset(buffer, 0, sizeof(buffer));
1353 if (count > sizeof(buffer) - 1)
1354 count = sizeof(buffer) - 1;
1355 if (copy_from_user(buffer, buf, count))
1356 return -EFAULT;
1357
1358 p = get_proc_task(inode);
1359 if (!p)
1360 return -ESRCH;
1361
1362 if (same_thread_group(current, p))
1363 set_task_comm(p, buffer);
1364 else
1365 count = -EINVAL;
1366
1367 put_task_struct(p);
1368
1369 return count;
1370}
1371
1372static int comm_show(struct seq_file *m, void *v)
1373{
1374 struct inode *inode = m->private;
1375 struct task_struct *p;
1376
1377 p = get_proc_task(inode);
1378 if (!p)
1379 return -ESRCH;
1380
1381 task_lock(p);
1382 seq_printf(m, "%s\n", p->comm);
1383 task_unlock(p);
1384
1385 put_task_struct(p);
1386
1387 return 0;
1388}
1389
1390static int comm_open(struct inode *inode, struct file *filp)
1391{
c6a34058 1392 return single_open(filp, comm_show, inode);
4614a696 1393}
1394
1395static const struct file_operations proc_pid_set_comm_operations = {
1396 .open = comm_open,
1397 .read = seq_read,
1398 .write = comm_write,
1399 .llseek = seq_lseek,
1400 .release = single_release,
1401};
1402
7773fbc5 1403static int proc_exe_link(struct dentry *dentry, struct path *exe_path)
925d1c40
MH		 1404{
1405 struct task_struct *task;
1406 struct mm_struct *mm;
1407 struct file *exe_file;
1408
7773fbc5 1409 task = get_proc_task(dentry->d_inode);
925d1c40
MH		 1410 if (!task)
1411 return -ENOENT;
1412 mm = get_task_mm(task);
1413 put_task_struct(task);
1414 if (!mm)
1415 return -ENOENT;
1416 exe_file = get_mm_exe_file(mm);
1417 mmput(mm);
1418 if (exe_file) {
1419 *exe_path = exe_file->f_path;
1420 path_get(&exe_file->f_path);
1421 fput(exe_file);
1422 return 0;
1423 } else
1424 return -ENOENT;
1425}
1426
008b150a 1427static void *proc_pid_follow_link(struct dentry *dentry, struct nameidata *nd)
1da177e4
LT		 1428{
1429 struct inode *inode = dentry->d_inode;
408ef013 1430 struct path path;
1da177e4
LT		 1431 int error = -EACCES;
1432
778c1144
EB		 1433 /* Are we allowed to snoop on the tasks file descriptors? */
1434 if (!proc_fd_access_allowed(inode))
1da177e4 1435 goto out;
1da177e4 1436
408ef013
CH		 1437 error = PROC_I(inode)->op.proc_get_link(dentry, &path);
1438 if (error)
1439 goto out;
1440
b5fb63c1 1441 nd_jump_link(nd, &path);
408ef013 1442 return NULL;
1da177e4 1443out:
008b150a 1444 return ERR_PTR(error);
1da177e4
LT		 1445}
1446
3dcd25f3 1447static int do_proc_readlink(struct path *path, char __user *buffer, int buflen)
1da177e4 1448{
e12ba74d 1449 char *tmp = (char*)__get_free_page(GFP_TEMPORARY);
3dcd25f3 1450 char *pathname;
1da177e4
LT		 1451 int len;
1452
1453 if (!tmp)
1454 return -ENOMEM;
0c28f287 1455
7b2a69ba 1456 pathname = d_path(path, tmp, PAGE_SIZE);
3dcd25f3
JB		 1457 len = PTR_ERR(pathname);
1458 if (IS_ERR(pathname))
1da177e4 1459 goto out;
3dcd25f3 1460 len = tmp + PAGE_SIZE - 1 - pathname;
1da177e4
LT		 1461
1462 if (len > buflen)
1463 len = buflen;
3dcd25f3 1464 if (copy_to_user(buffer, pathname, len))
1da177e4
LT		 1465 len = -EFAULT;
1466 out:
1467 free_page((unsigned long)tmp);
1468 return len;
1469}
1470
1471static int proc_pid_readlink(struct dentry * dentry, char __user * buffer, int buflen)
1472{
1473 int error = -EACCES;
1474 struct inode *inode = dentry->d_inode;
3dcd25f3 1475 struct path path;
1da177e4 1476
778c1144
EB		 1477 /* Are we allowed to snoop on the tasks file descriptors? */
1478 if (!proc_fd_access_allowed(inode))
1da177e4 1479 goto out;
1da177e4 1480
7773fbc5 1481 error = PROC_I(inode)->op.proc_get_link(dentry, &path);
1da177e4
LT		 1482 if (error)
1483 goto out;
1484
3dcd25f3
JB		 1485 error = do_proc_readlink(&path, buffer, buflen);
1486 path_put(&path);
1da177e4 1487out:
1da177e4
LT		 1488 return error;
1489}
1490
c5ef1c42 1491static const struct inode_operations proc_pid_link_inode_operations = {
1da177e4 1492 .readlink = proc_pid_readlink,
6d76fa58
LT		 1493 .follow_link = proc_pid_follow_link,
1494 .setattr = proc_setattr,
1da177e4
LT		 1495};
1496
28a6d671
EB		 1497
1498/* building an inode */
1499
1500static int task_dumpable(struct task_struct *task)
1da177e4 1501{
28a6d671
EB		 1502 int dumpable = 0;
1503 struct mm_struct *mm;
1da177e4 1504
28a6d671
EB		 1505 task_lock(task);
1506 mm = task->mm;
1507 if (mm)
6c5d5238 1508 dumpable = get_dumpable(mm);
28a6d671
EB		 1509 task_unlock(task);
1510 if(dumpable == 1)
1511 return 1;
1512 return 0;
1513}
1da177e4 1514
6b4e306a 1515struct inode *proc_pid_make_inode(struct super_block * sb, struct task_struct *task)
28a6d671
EB		 1516{
1517 struct inode * inode;
1518 struct proc_inode *ei;
c69e8d9c 1519 const struct cred *cred;
1da177e4 1520
28a6d671 1521 /* We need a new inode */
1da177e4 1522
28a6d671
EB		 1523 inode = new_inode(sb);
1524 if (!inode)
1525 goto out;
1526
1527 /* Common stuff */
1528 ei = PROC_I(inode);
85fe4025 1529 inode->i_ino = get_next_ino();
28a6d671 1530 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
28a6d671
EB		 1531 inode->i_op = &proc_def_inode_operations;
1532
1533 /*
1534 * grab the reference to task.
1535 */
1a657f78 1536 ei->pid = get_task_pid(task, PIDTYPE_PID);
28a6d671
EB		 1537 if (!ei->pid)
1538 goto out_unlock;
1539
28a6d671 1540 if (task_dumpable(task)) {
c69e8d9c
DH		 1541 rcu_read_lock();
1542 cred = __task_cred(task);
1543 inode->i_uid = cred->euid;
1544 inode->i_gid = cred->egid;
1545 rcu_read_unlock();
1da177e4 1546 }
28a6d671
EB		 1547 security_task_to_inode(task, inode);
1548
1da177e4 1549out:
28a6d671
EB		 1550 return inode;
1551
1552out_unlock:
1553 iput(inode);
1554 return NULL;
1da177e4
LT		 1555}
1556
6b4e306a 1557int pid_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
1da177e4 1558{
1da177e4 1559 struct inode *inode = dentry->d_inode;
28a6d671 1560 struct task_struct *task;
c69e8d9c 1561 const struct cred *cred;
0499680a 1562 struct pid_namespace *pid = dentry->d_sb->s_fs_info;
c69e8d9c 1563
28a6d671 1564 generic_fillattr(inode, stat);
1da177e4 1565
28a6d671 1566 rcu_read_lock();
dcb0f222
EB		 1567 stat->uid = GLOBAL_ROOT_UID;
1568 stat->gid = GLOBAL_ROOT_GID;
28a6d671
EB		 1569 task = pid_task(proc_pid(inode), PIDTYPE_PID);
1570 if (task) {
0499680a
VK		 1571 if (!has_pid_permissions(pid, task, 2)) {
1572 rcu_read_unlock();
1573 /*
1574 * This doesn't prevent learning whether PID exists,
1575 * it only makes getattr() consistent with readdir().
1576 */
1577 return -ENOENT;
1578 }
28a6d671
EB		 1579 if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) ||
1580 task_dumpable(task)) {
c69e8d9c
DH		 1581 cred = __task_cred(task);
1582 stat->uid = cred->euid;
1583 stat->gid = cred->egid;
1da177e4
LT		 1584 }
1585 }
28a6d671 1586 rcu_read_unlock();
d6e71144 1587 return 0;
1da177e4
LT		 1588}
1589
1da177e4
LT		 1590/* dentry stuff */
1591
1592/*
1593 * Exceptional case: normally we are not allowed to unhash a busy
1594 * directory. In this case, however, we can do it - no aliasing problems
1595 * due to the way we treat inodes.
1596 *
1597 * Rewrite the inode's ownerships here because the owning task may have
1598 * performed a setuid(), etc.
99f89551
EB		 1599 *
1600 * Before the /proc/pid/status file was created the only way to read
1601 * the effective uid of a /process was to stat /proc/pid. Reading
1602 * /proc/pid/status is slow enough that procps and other packages
1603 * kept stating /proc/pid. To keep the rules in /proc simple I have
1604 * made this apply to all per process world readable and executable
1605 * directories.
1da177e4 1606 */
0b728e19 1607int pid_revalidate(struct dentry *dentry, unsigned int flags)
1da177e4 1608{
34286d66
NP		 1609 struct inode *inode;
1610 struct task_struct *task;
c69e8d9c
DH		 1611 const struct cred *cred;
1612
0b728e19 1613 if (flags & LOOKUP_RCU)
34286d66
NP		 1614 return -ECHILD;
1615
1616 inode = dentry->d_inode;
1617 task = get_proc_task(inode);
1618
99f89551
EB		 1619 if (task) {
1620 if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) ||
1621 task_dumpable(task)) {
c69e8d9c
DH		 1622 rcu_read_lock();
1623 cred = __task_cred(task);
1624 inode->i_uid = cred->euid;
1625 inode->i_gid = cred->egid;
1626 rcu_read_unlock();
1da177e4 1627 } else {
dcb0f222
EB		 1628 inode->i_uid = GLOBAL_ROOT_UID;
1629 inode->i_gid = GLOBAL_ROOT_GID;
1da177e4 1630 }
9ee8ab9f 1631 inode->i_mode &= ~(S_ISUID | S_ISGID);
1da177e4 1632 security_task_to_inode(task, inode);
99f89551 1633 put_task_struct(task);
1da177e4
LT		 1634 return 1;
1635 }
1636 d_drop(dentry);
1637 return 0;
1638}
1639
fe15ce44 1640static int pid_delete_dentry(const struct dentry * dentry)
99f89551 1641{
28a6d671
EB		 1642 /* Is the task we represent dead?
1643 * If so, then don't put the dentry on the lru list,
1644 * kill it immediately.
1645 */
1646 return !proc_pid(dentry->d_inode)->tasks[PIDTYPE_PID].first;
1647}
1648
6b4e306a 1649const struct dentry_operations pid_dentry_operations =
28a6d671
EB		 1650{
1651 .d_revalidate = pid_revalidate,
1652 .d_delete = pid_delete_dentry,
1653};
1654
1655/* Lookups */
1656
1c0d04c9
EB		 1657/*
1658 * Fill a directory entry.
1659 *
1660 * If possible create the dcache entry and derive our inode number and
1661 * file type from dcache entry.
1662 *
1663 * Since all of the proc inode numbers are dynamically generated, the inode
1664 * numbers do not exist until the inode is cache. This means creating the
1665 * the dcache entry in readdir is necessary to keep the inode numbers
1666 * reported by readdir in sync with the inode numbers reported
1667 * by stat.
1668 */
6b4e306a
EB		 1669int proc_fill_cache(struct file *filp, void *dirent, filldir_t filldir,
1670 const char *name, int len,
c5141e6d 1671 instantiate_t instantiate, struct task_struct *task, const void *ptr)
61a28784 1672{
2fddfeef 1673 struct dentry *child, *dir = filp->f_path.dentry;
61a28784
EB		 1674 struct inode *inode;
1675 struct qstr qname;
1676 ino_t ino = 0;
1677 unsigned type = DT_UNKNOWN;
1678
1679 qname.name = name;
1680 qname.len = len;
1681 qname.hash = full_name_hash(name, len);
1682
1683 child = d_lookup(dir, &qname);
1684 if (!child) {
1685 struct dentry *new;
1686 new = d_alloc(dir, &qname);
1687 if (new) {
1688 child = instantiate(dir->d_inode, new, task, ptr);
1689 if (child)
1690 dput(new);
1691 else
1692 child = new;
1693 }
1694 }
1695 if (!child || IS_ERR(child) || !child->d_inode)
1696 goto end_instantiate;
1697 inode = child->d_inode;
1698 if (inode) {
1699 ino = inode->i_ino;
1700 type = inode->i_mode >> 12;
1701 }
1702 dput(child);
1703end_instantiate:
1704 if (!ino)
1705 ino = find_inode_number(dir, &qname);
1706 if (!ino)
1707 ino = 1;
1708 return filldir(dirent, name, len, filp->f_pos, ino, type);
1709}
1710
28a6d671
EB		 1711static unsigned name_to_int(struct dentry *dentry)
1712{
1713 const char *name = dentry->d_name.name;
1714 int len = dentry->d_name.len;
1715 unsigned n = 0;
1716
1717 if (len > 1 && *name == '0')
1718 goto out;
1719 while (len-- > 0) {
1720 unsigned c = *name++ - '0';
1721 if (c > 9)
1722 goto out;
1723 if (n >= (~0U-9)/10)
1724 goto out;
1725 n *= 10;
1726 n += c;
1727 }
1728 return n;
1729out:
1730 return ~0U;
1731}
1732
27932742
MS		 1733#define PROC_FDINFO_MAX 64
1734
3dcd25f3 1735static int proc_fd_info(struct inode *inode, struct path *path, char *info)
28a6d671 1736{
5e442a49
LT		 1737 struct task_struct *task = get_proc_task(inode);
1738 struct files_struct *files = NULL;
28a6d671
EB		 1739 struct file *file;
1740 int fd = proc_fd(inode);
aa6afca5 1741
5e442a49
LT		 1742 if (task) {
1743 files = get_files_struct(task);
1744 put_task_struct(task);
1745 }
1746 if (files) {
1747 /*
1748 * We are not taking a ref to the file structure, so we must
1749 * hold ->file_lock.
1750 */
1751 spin_lock(&files->file_lock);
1752 file = fcheck_files(files, fd);
1753 if (file) {
1754 unsigned int f_flags;
1755 struct fdtable *fdt;
1756
1757 fdt = files_fdtable(files);
1758 f_flags = file->f_flags & ~O_CLOEXEC;
1dce27c5 1759 if (close_on_exec(fd, fdt))
5e442a49
LT		 1760 f_flags |= O_CLOEXEC;
1761
1762 if (path) {
1763 *path = file->f_path;
1764 path_get(&file->f_path);
1765 }
1766 if (info)
1767 snprintf(info, PROC_FDINFO_MAX,
1768 "pos:\t%lli\n"
1769 "flags:\t0%o\n",
1770 (long long) file->f_pos,
1771 f_flags);
1772 spin_unlock(&files->file_lock);
1773 put_files_struct(files);
1774 return 0;
99f89551 1775 }
5e442a49
LT		 1776 spin_unlock(&files->file_lock);
1777 put_files_struct(files);
1778 }
1779 return -ENOENT;
99f89551
EB		 1780}
1781
7773fbc5 1782static int proc_fd_link(struct dentry *dentry, struct path *path)
27932742 1783{
7773fbc5 1784 return proc_fd_info(dentry->d_inode, path, NULL);
27932742
MS		 1785}
1786
0b728e19 1787static int tid_fd_revalidate(struct dentry *dentry, unsigned int flags)
1da177e4 1788{
34286d66
NP		 1789 struct inode *inode;
1790 struct task_struct *task;
1791 int fd;
1da177e4 1792 struct files_struct *files;
c69e8d9c 1793 const struct cred *cred;
1da177e4 1794
0b728e19 1795 if (flags & LOOKUP_RCU)
34286d66
NP		 1796 return -ECHILD;
1797
1798 inode = dentry->d_inode;
1799 task = get_proc_task(inode);
1800 fd = proc_fd(inode);
1801
99f89551
EB		 1802 if (task) {
1803 files = get_files_struct(task);
1804 if (files) {
30a08bf2 1805 struct file *file;
99f89551 1806 rcu_read_lock();
30a08bf2
LT		 1807 file = fcheck_files(files, fd);
1808 if (file) {
0640113b 1809 unsigned f_mode = file->f_mode;
30a08bf2 1810
99f89551
EB		 1811 rcu_read_unlock();
1812 put_files_struct(files);
30a08bf2 1813
99f89551 1814 if (task_dumpable(task)) {
c69e8d9c
DH		 1815 rcu_read_lock();
1816 cred = __task_cred(task);
1817 inode->i_uid = cred->euid;
1818 inode->i_gid = cred->egid;
1819 rcu_read_unlock();
99f89551 1820 } else {
dcb0f222
EB		 1821 inode->i_uid = GLOBAL_ROOT_UID;
1822 inode->i_gid = GLOBAL_ROOT_GID;
99f89551 1823 }
30a08bf2 1824
0640113b
LT		 1825 if (S_ISLNK(inode->i_mode)) {
1826 unsigned i_mode = S_IFLNK;
1827 if (f_mode & FMODE_READ)
1828 i_mode |= S_IRUSR | S_IXUSR;
1829 if (f_mode & FMODE_WRITE)
1830 i_mode |= S_IWUSR | S_IXUSR;
1831 inode->i_mode = i_mode;
1832 }
30a08bf2 1833
99f89551
EB		 1834 security_task_to_inode(task, inode);
1835 put_task_struct(task);
1836 return 1;
1837 }
b835996f 1838 rcu_read_unlock();
1da177e4 1839 put_files_struct(files);
1da177e4 1840 }
99f89551 1841 put_task_struct(task);
1da177e4
LT		 1842 }
1843 d_drop(dentry);
1844 return 0;
1845}
1846
d72f71eb 1847static const struct dentry_operations tid_fd_dentry_operations =
1da177e4
LT		 1848{
1849 .d_revalidate = tid_fd_revalidate,
1850 .d_delete = pid_delete_dentry,
1851};
1852
444ceed8 1853static struct dentry *proc_fd_instantiate(struct inode *dir,
c5141e6d 1854 struct dentry *dentry, struct task_struct *task, const void *ptr)
1da177e4 1855{
af5e6171 1856 unsigned fd = (unsigned long)ptr;
444ceed8
EB		 1857 struct inode *inode;
1858 struct proc_inode *ei;
1859 struct dentry *error = ERR_PTR(-ENOENT);
1da177e4 1860
61a28784 1861 inode = proc_pid_make_inode(dir->i_sb, task);
1da177e4
LT		 1862 if (!inode)
1863 goto out;
1864 ei = PROC_I(inode);
aed7a6c4 1865 ei->fd = fd;
444ceed8 1866
0640113b 1867 inode->i_mode = S_IFLNK;
5e442a49 1868 inode->i_op = &proc_pid_link_inode_operations;
1da177e4
LT		 1869 inode->i_size = 64;
1870 ei->op.proc_get_link = proc_fd_link;
fb045adb 1871 d_set_d_op(dentry, &tid_fd_dentry_operations);
1da177e4 1872 d_add(dentry, inode);
cd6a3ce9 1873 /* Close the race of the process dying before we return the dentry */
0b728e19 1874 if (tid_fd_revalidate(dentry, 0))
444ceed8 1875 error = NULL;
1da177e4 1876
444ceed8
EB		 1877 out:
1878 return error;
1da177e4
LT		 1879}
1880
27932742
MS		 1881static struct dentry *proc_lookupfd_common(struct inode *dir,
1882 struct dentry *dentry,
1883 instantiate_t instantiate)
444ceed8
EB		 1884{
1885 struct task_struct *task = get_proc_task(dir);
1886 unsigned fd = name_to_int(dentry);
1887 struct dentry *result = ERR_PTR(-ENOENT);
1888
1889 if (!task)
1890 goto out_no_task;
1891 if (fd == ~0U)
1892 goto out;
1893
af5e6171 1894 result = instantiate(dir, dentry, task, (void *)(unsigned long)fd);
444ceed8
EB		 1895out:
1896 put_task_struct(task);
1897out_no_task:
1898 return result;
1899}
1900
27932742
MS		 1901static int proc_readfd_common(struct file * filp, void * dirent,
1902 filldir_t filldir, instantiate_t instantiate)
28a6d671 1903{
2fddfeef 1904 struct dentry *dentry = filp->f_path.dentry;
28a6d671
EB		 1905 struct inode *inode = dentry->d_inode;
1906 struct task_struct *p = get_proc_task(inode);
457c2510 1907 unsigned int fd, ino;
28a6d671 1908 int retval;
28a6d671 1909 struct files_struct * files;
1da177e4 1910
28a6d671
EB		 1911 retval = -ENOENT;
1912 if (!p)
1913 goto out_no_task;
1914 retval = 0;
28a6d671
EB		 1915
1916 fd = filp->f_pos;
1917 switch (fd) {
1918 case 0:
1919 if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0)
5e442a49 1920 goto out;
28a6d671
EB		 1921 filp->f_pos++;
1922 case 1:
1923 ino = parent_ino(dentry);
1924 if (filldir(dirent, "..", 2, 1, ino, DT_DIR) < 0)
5e442a49 1925 goto out;
28a6d671
EB		 1926 filp->f_pos++;
1927 default:
1928 files = get_files_struct(p);
1929 if (!files)
5e442a49 1930 goto out;
28a6d671 1931 rcu_read_lock();
28a6d671 1932 for (fd = filp->f_pos-2;
9b4f526c 1933 fd < files_fdtable(files)->max_fds;
28a6d671 1934 fd++, filp->f_pos++) {
27932742
MS		 1935 char name[PROC_NUMBUF];
1936 int len;
f05ed3f1 1937 int rv;
28a6d671
EB		 1938
1939 if (!fcheck_files(files, fd))
1940 continue;
1941 rcu_read_unlock();
1942
27932742 1943 len = snprintf(name, sizeof(name), "%d", fd);
f05ed3f1
AD		 1944 rv = proc_fill_cache(filp, dirent, filldir,
1945 name, len, instantiate, p,
af5e6171 1946 (void *)(unsigned long)fd);
f05ed3f1
AD		 1947 if (rv < 0)
1948 goto out_fd_loop;
28a6d671
EB		 1949 rcu_read_lock();
1950 }
1951 rcu_read_unlock();
f05ed3f1 1952out_fd_loop:
28a6d671
EB		 1953 put_files_struct(files);
1954 }
1955out:
1956 put_task_struct(p);
1957out_no_task:
1958 return retval;
1959}
1960
27932742 1961static struct dentry *proc_lookupfd(struct inode *dir, struct dentry *dentry,
00cd8dd3 1962 unsigned int flags)
27932742
MS		 1963{
1964 return proc_lookupfd_common(dir, dentry, proc_fd_instantiate);
1965}
1966
1967static int proc_readfd(struct file *filp, void *dirent, filldir_t filldir)
1968{
1969 return proc_readfd_common(filp, dirent, filldir, proc_fd_instantiate);
1970}
1971
1972static ssize_t proc_fdinfo_read(struct file *file, char __user *buf,
1973 size_t len, loff_t *ppos)
1974{
1975 char tmp[PROC_FDINFO_MAX];
3dcd25f3 1976 int err = proc_fd_info(file->f_path.dentry->d_inode, NULL, tmp);
27932742
MS		 1977 if (!err)
1978 err = simple_read_from_buffer(buf, len, ppos, tmp, strlen(tmp));
1979 return err;
1980}
1981
1982static const struct file_operations proc_fdinfo_file_operations = {
87df8424 1983 .open = nonseekable_open,
27932742 1984 .read = proc_fdinfo_read,
6038f373 1985 .llseek = no_llseek,
27932742
MS		 1986};
1987
00977a59 1988static const struct file_operations proc_fd_operations = {
28a6d671
EB		 1989 .read = generic_read_dir,
1990 .readdir = proc_readfd,
6038f373 1991 .llseek = default_llseek,
1da177e4
LT		 1992};
1993
640708a2
PE		 1994#ifdef CONFIG_CHECKPOINT_RESTORE
1995
1996/*
1997 * dname_to_vma_addr - maps a dentry name into two unsigned longs
1998 * which represent vma start and end addresses.
1999 */
2000static int dname_to_vma_addr(struct dentry *dentry,
2001 unsigned long *start, unsigned long *end)
2002{
2003 if (sscanf(dentry->d_name.name, "%lx-%lx", start, end) != 2)
2004 return -EINVAL;
2005
2006 return 0;
2007}
2008
0b728e19 2009static int map_files_d_revalidate(struct dentry *dentry, unsigned int flags)
640708a2
PE		 2010{
2011 unsigned long vm_start, vm_end;
2012 bool exact_vma_exists = false;
2013 struct mm_struct *mm = NULL;
2014 struct task_struct *task;
2015 const struct cred *cred;
2016 struct inode *inode;
2017 int status = 0;
2018
0b728e19 2019 if (flags & LOOKUP_RCU)
640708a2
PE		 2020 return -ECHILD;
2021
2022 if (!capable(CAP_SYS_ADMIN)) {
2023 status = -EACCES;
2024 goto out_notask;
2025 }
2026
2027 inode = dentry->d_inode;
2028 task = get_proc_task(inode);
2029 if (!task)
2030 goto out_notask;
2031
2344bec7
CW		 2032 mm = mm_access(task, PTRACE_MODE_READ);
2033 if (IS_ERR_OR_NULL(mm))
640708a2
PE		 2034 goto out;
2035
2036 if (!dname_to_vma_addr(dentry, &vm_start, &vm_end)) {
2037 down_read(&mm->mmap_sem);
2038 exact_vma_exists = !!find_exact_vma(mm, vm_start, vm_end);
2039 up_read(&mm->mmap_sem);
2040 }
2041
2042 mmput(mm);
2043
2044 if (exact_vma_exists) {
2045 if (task_dumpable(task)) {
2046 rcu_read_lock();
2047 cred = __task_cred(task);
2048 inode->i_uid = cred->euid;
2049 inode->i_gid = cred->egid;
2050 rcu_read_unlock();
2051 } else {
dcb0f222
EB		 2052 inode->i_uid = GLOBAL_ROOT_UID;
2053 inode->i_gid = GLOBAL_ROOT_GID;
640708a2
PE		 2054 }
2055 security_task_to_inode(task, inode);
2056 status = 1;
2057 }
2058
2059out:
2060 put_task_struct(task);
2061
2062out_notask:
2063 if (status <= 0)
2064 d_drop(dentry);
2065
2066 return status;
2067}
2068
2069static const struct dentry_operations tid_map_files_dentry_operations = {
2070 .d_revalidate = map_files_d_revalidate,
2071 .d_delete = pid_delete_dentry,
2072};
2073
2074static int proc_map_files_get_link(struct dentry *dentry, struct path *path)
2075{
2076 unsigned long vm_start, vm_end;
2077 struct vm_area_struct *vma;
2078 struct task_struct *task;
2079 struct mm_struct *mm;
2080 int rc;
2081
2082 rc = -ENOENT;
2083 task = get_proc_task(dentry->d_inode);
2084 if (!task)
2085 goto out;
2086
2087 mm = get_task_mm(task);
2088 put_task_struct(task);
2089 if (!mm)
2090 goto out;
2091
2092 rc = dname_to_vma_addr(dentry, &vm_start, &vm_end);
2093 if (rc)
2094 goto out_mmput;
2095
2096 down_read(&mm->mmap_sem);
2097 vma = find_exact_vma(mm, vm_start, vm_end);
2098 if (vma && vma->vm_file) {
2099 *path = vma->vm_file->f_path;
2100 path_get(path);
2101 rc = 0;
2102 }
2103 up_read(&mm->mmap_sem);
2104
2105out_mmput:
2106 mmput(mm);
2107out:
2108 return rc;
2109}
2110
2111struct map_files_info {
2112 struct file *file;
2113 unsigned long len;
2114 unsigned char name[4*sizeof(long)+2]; /* max: %lx-%lx\0 */
2115};
2116
2117static struct dentry *
2118proc_map_files_instantiate(struct inode *dir, struct dentry *dentry,
2119 struct task_struct *task, const void *ptr)
2120{
2121 const struct file *file = ptr;
2122 struct proc_inode *ei;
2123 struct inode *inode;
2124
2125 if (!file)
2126 return ERR_PTR(-ENOENT);
2127
2128 inode = proc_pid_make_inode(dir->i_sb, task);
2129 if (!inode)
2130 return ERR_PTR(-ENOENT);
2131
2132 ei = PROC_I(inode);
2133 ei->op.proc_get_link = proc_map_files_get_link;
2134
2135 inode->i_op = &proc_pid_link_inode_operations;
2136 inode->i_size = 64;
2137 inode->i_mode = S_IFLNK;
2138
2139 if (file->f_mode & FMODE_READ)
2140 inode->i_mode |= S_IRUSR;
2141 if (file->f_mode & FMODE_WRITE)
2142 inode->i_mode |= S_IWUSR;
2143
2144 d_set_d_op(dentry, &tid_map_files_dentry_operations);
2145 d_add(dentry, inode);
2146
2147 return NULL;
2148}
2149
2150static struct dentry *proc_map_files_lookup(struct inode *dir,
00cd8dd3 2151 struct dentry *dentry, unsigned int flags)
640708a2
PE		 2152{
2153 unsigned long vm_start, vm_end;
2154 struct vm_area_struct *vma;
2155 struct task_struct *task;
2156 struct dentry *result;
2157 struct mm_struct *mm;
2158
2159 result = ERR_PTR(-EACCES);
2160 if (!capable(CAP_SYS_ADMIN))
2161 goto out;
2162
2163 result = ERR_PTR(-ENOENT);
2164 task = get_proc_task(dir);
2165 if (!task)
2166 goto out;
2167
2168 result = ERR_PTR(-EACCES);
eb94cd96 2169 if (!ptrace_may_access(task, PTRACE_MODE_READ))
640708a2
PE		 2170 goto out_put_task;
2171
2172 result = ERR_PTR(-ENOENT);
2173 if (dname_to_vma_addr(dentry, &vm_start, &vm_end))
eb94cd96 2174 goto out_put_task;
640708a2
PE		 2175
2176 mm = get_task_mm(task);
2177 if (!mm)
eb94cd96 2178 goto out_put_task;
640708a2
PE		 2179
2180 down_read(&mm->mmap_sem);
2181 vma = find_exact_vma(mm, vm_start, vm_end);
2182 if (!vma)
2183 goto out_no_vma;
2184
2185 result = proc_map_files_instantiate(dir, dentry, task, vma->vm_file);
2186
2187out_no_vma:
2188 up_read(&mm->mmap_sem);
2189 mmput(mm);
640708a2
PE		 2190out_put_task:
2191 put_task_struct(task);
2192out:
2193 return result;
2194}
2195
2196static const struct inode_operations proc_map_files_inode_operations = {
2197 .lookup = proc_map_files_lookup,
2198 .permission = proc_fd_permission,
2199 .setattr = proc_setattr,
2200};
2201
2202static int
2203proc_map_files_readdir(struct file *filp, void *dirent, filldir_t filldir)
2204{
2205 struct dentry *dentry = filp->f_path.dentry;
2206 struct inode *inode = dentry->d_inode;
2207 struct vm_area_struct *vma;
2208 struct task_struct *task;
2209 struct mm_struct *mm;
2210 ino_t ino;
2211 int ret;
2212
2213 ret = -EACCES;
2214 if (!capable(CAP_SYS_ADMIN))
2215 goto out;
2216
2217 ret = -ENOENT;
2218 task = get_proc_task(inode);
2219 if (!task)
2220 goto out;
2221
2222 ret = -EACCES;
eb94cd96 2223 if (!ptrace_may_access(task, PTRACE_MODE_READ))
640708a2
PE		 2224 goto out_put_task;
2225
2226 ret = 0;
2227 switch (filp->f_pos) {
2228 case 0:
2229 ino = inode->i_ino;
2230 if (filldir(dirent, ".", 1, 0, ino, DT_DIR) < 0)
eb94cd96 2231 goto out_put_task;
640708a2
PE		 2232 filp->f_pos++;
2233 case 1:
2234 ino = parent_ino(dentry);
2235 if (filldir(dirent, "..", 2, 1, ino, DT_DIR) < 0)
eb94cd96 2236 goto out_put_task;
640708a2
PE		 2237 filp->f_pos++;
2238 default:
2239 {
2240 unsigned long nr_files, pos, i;
2241 struct flex_array *fa = NULL;
2242 struct map_files_info info;
2243 struct map_files_info *p;
2244
2245 mm = get_task_mm(task);
2246 if (!mm)
eb94cd96 2247 goto out_put_task;
640708a2
PE		 2248 down_read(&mm->mmap_sem);
2249
2250 nr_files = 0;
2251
2252 /*
2253 * We need two passes here:
2254 *
2255 * 1) Collect vmas of mapped files with mmap_sem taken
2256 * 2) Release mmap_sem and instantiate entries
2257 *
2258 * otherwise we get lockdep complained, since filldir()
2259 * routine might require mmap_sem taken in might_fault().
2260 */
2261
2262 for (vma = mm->mmap, pos = 2; vma; vma = vma->vm_next) {
2263 if (vma->vm_file && ++pos > filp->f_pos)
2264 nr_files++;
2265 }
2266
2267 if (nr_files) {
2268 fa = flex_array_alloc(sizeof(info), nr_files,
2269 GFP_KERNEL);
2270 if (!fa || flex_array_prealloc(fa, 0, nr_files,
2271 GFP_KERNEL)) {
2272 ret = -ENOMEM;
2273 if (fa)
2274 flex_array_free(fa);
2275 up_read(&mm->mmap_sem);
2276 mmput(mm);
eb94cd96 2277 goto out_put_task;
640708a2
PE		 2278 }
2279 for (i = 0, vma = mm->mmap, pos = 2; vma;
2280 vma = vma->vm_next) {
2281 if (!vma->vm_file)
2282 continue;
2283 if (++pos <= filp->f_pos)
2284 continue;
2285
2286 get_file(vma->vm_file);
2287 info.file = vma->vm_file;
2288 info.len = snprintf(info.name,
2289 sizeof(info.name), "%lx-%lx",
2290 vma->vm_start, vma->vm_end);
2291 if (flex_array_put(fa, i++, &info, GFP_KERNEL))
2292 BUG();
2293 }
2294 }
2295 up_read(&mm->mmap_sem);
2296
2297 for (i = 0; i < nr_files; i++) {
2298 p = flex_array_get(fa, i);
2299 ret = proc_fill_cache(filp, dirent, filldir,
2300 p->name, p->len,
2301 proc_map_files_instantiate,
2302 task, p->file);
2303 if (ret)
2304 break;
2305 filp->f_pos++;
2306 fput(p->file);
2307 }
2308 for (; i < nr_files; i++) {
2309 /*
2310 * In case of error don't forget
2311 * to put rest of file refs.
2312 */
2313 p = flex_array_get(fa, i);
2314 fput(p->file);
2315 }
2316 if (fa)
2317 flex_array_free(fa);
2318 mmput(mm);
2319 }
2320 }
2321
640708a2
PE		 2322out_put_task:
2323 put_task_struct(task);
2324out:
2325 return ret;
2326}
2327
2328static const struct file_operations proc_map_files_operations = {
2329 .read = generic_read_dir,
2330 .readdir = proc_map_files_readdir,
2331 .llseek = default_llseek,
2332};
2333
2334#endif /* CONFIG_CHECKPOINT_RESTORE */
2335
8948e11f
AD		 2336/*
2337 * /proc/pid/fd needs a special permission handler so that a process can still
2338 * access /proc/self/fd after it has executed a setuid().
2339 */
10556cb2 2340static int proc_fd_permission(struct inode *inode, int mask)
8948e11f 2341{
2830ba7f 2342 int rv = generic_permission(inode, mask);
8948e11f
AD		 2343 if (rv == 0)
2344 return 0;
2345 if (task_pid(current) == proc_pid(inode))
2346 rv = 0;
2347 return rv;
2348}
2349
1da177e4
LT		 2350/*
2351 * proc directories can do almost nothing..
2352 */
c5ef1c42 2353static const struct inode_operations proc_fd_inode_operations = {
1da177e4 2354 .lookup = proc_lookupfd,
8948e11f 2355 .permission = proc_fd_permission,
6d76fa58 2356 .setattr = proc_setattr,
1da177e4
LT		 2357};
2358
27932742
MS		 2359static struct dentry *proc_fdinfo_instantiate(struct inode *dir,
2360 struct dentry *dentry, struct task_struct *task, const void *ptr)
2361{
af5e6171 2362 unsigned fd = (unsigned long)ptr;
27932742
MS		 2363 struct inode *inode;
2364 struct proc_inode *ei;
2365 struct dentry *error = ERR_PTR(-ENOENT);
2366
2367 inode = proc_pid_make_inode(dir->i_sb, task);
2368 if (!inode)
2369 goto out;
2370 ei = PROC_I(inode);
2371 ei->fd = fd;
2372 inode->i_mode = S_IFREG | S_IRUSR;
2373 inode->i_fop = &proc_fdinfo_file_operations;
fb045adb 2374 d_set_d_op(dentry, &tid_fd_dentry_operations);
27932742
MS		 2375 d_add(dentry, inode);
2376 /* Close the race of the process dying before we return the dentry */
0b728e19 2377 if (tid_fd_revalidate(dentry, 0))
27932742
MS		 2378 error = NULL;
2379
2380 out:
2381 return error;
2382}
2383
2384static struct dentry *proc_lookupfdinfo(struct inode *dir,
2385 struct dentry *dentry,
00cd8dd3 2386 unsigned int flags)
27932742
MS		 2387{
2388 return proc_lookupfd_common(dir, dentry, proc_fdinfo_instantiate);
2389}
2390
2391static int proc_readfdinfo(struct file *filp, void *dirent, filldir_t filldir)
2392{
2393 return proc_readfd_common(filp, dirent, filldir,
2394 proc_fdinfo_instantiate);
2395}
2396
2397static const struct file_operations proc_fdinfo_operations = {
2398 .read = generic_read_dir,
2399 .readdir = proc_readfdinfo,
6038f373 2400 .llseek = default_llseek,
27932742
MS		 2401};
2402
2403/*
2404 * proc directories can do almost nothing..
2405 */
2406static const struct inode_operations proc_fdinfo_inode_operations = {
2407 .lookup = proc_lookupfdinfo,
2408 .setattr = proc_setattr,
2409};
2410
2411
444ceed8 2412static struct dentry *proc_pident_instantiate(struct inode *dir,
c5141e6d 2413 struct dentry *dentry, struct task_struct *task, const void *ptr)
444ceed8 2414{
c5141e6d 2415 const struct pid_entry *p = ptr;
444ceed8
EB		 2416 struct inode *inode;
2417 struct proc_inode *ei;
bd6daba9 2418 struct dentry *error = ERR_PTR(-ENOENT);
444ceed8 2419
61a28784 2420 inode = proc_pid_make_inode(dir->i_sb, task);
444ceed8
EB		 2421 if (!inode)
2422 goto out;
2423
2424 ei = PROC_I(inode);
2425 inode->i_mode = p->mode;
2426 if (S_ISDIR(inode->i_mode))
bfe86848 2427 set_nlink(inode, 2); /* Use getattr to fix if necessary */
444ceed8
EB		 2428 if (p->iop)
2429 inode->i_op = p->iop;
2430 if (p->fop)
2431 inode->i_fop = p->fop;
2432 ei->op = p->op;
fb045adb 2433 d_set_d_op(dentry, &pid_dentry_operations);
444ceed8
EB		 2434 d_add(dentry, inode);
2435 /* Close the race of the process dying before we return the dentry */
0b728e19 2436 if (pid_revalidate(dentry, 0))
444ceed8
EB		 2437 error = NULL;
2438out:
2439 return error;
2440}
2441
1da177e4
LT		 2442static struct dentry *proc_pident_lookup(struct inode *dir,
2443 struct dentry *dentry,
c5141e6d 2444 const struct pid_entry *ents,
7bcd6b0e 2445 unsigned int nents)
1da177e4 2446{
cd6a3ce9 2447 struct dentry *error;
99f89551 2448 struct task_struct *task = get_proc_task(dir);
c5141e6d 2449 const struct pid_entry *p, *last;
1da177e4 2450
cd6a3ce9 2451 error = ERR_PTR(-ENOENT);
1da177e4 2452
99f89551
EB		 2453 if (!task)
2454 goto out_no_task;
1da177e4 2455
20cdc894
EB		 2456 /*
2457 * Yes, it does not scale. And it should not. Don't add
2458 * new entries into /proc/<tgid>/ without very good reasons.
2459 */
7bcd6b0e
EB		 2460 last = &ents[nents - 1];
2461 for (p = ents; p <= last; p++) {
1da177e4
LT		 2462 if (p->len != dentry->d_name.len)
2463 continue;
2464 if (!memcmp(dentry->d_name.name, p->name, p->len))
2465 break;
2466 }
7bcd6b0e 2467 if (p > last)
1da177e4
LT		 2468 goto out;
2469
444ceed8 2470 error = proc_pident_instantiate(dir, dentry, task, p);
1da177e4 2471out:
99f89551
EB		 2472 put_task_struct(task);
2473out_no_task:
cd6a3ce9 2474 return error;
1da177e4
LT		 2475}
2476
c5141e6d
ED		 2477static int proc_pident_fill_cache(struct file *filp, void *dirent,
2478 filldir_t filldir, struct task_struct *task, const struct pid_entry *p)
61a28784
EB		 2479{
2480 return proc_fill_cache(filp, dirent, filldir, p->name, p->len,
2481 proc_pident_instantiate, task, p);
2482}
2483
28a6d671
EB		 2484static int proc_pident_readdir(struct file *filp,
2485 void *dirent, filldir_t filldir,
c5141e6d 2486 const struct pid_entry *ents, unsigned int nents)
28a6d671
EB		 2487{
2488 int i;
2fddfeef 2489 struct dentry *dentry = filp->f_path.dentry;
28a6d671
EB		 2490 struct inode *inode = dentry->d_inode;
2491 struct task_struct *task = get_proc_task(inode);
c5141e6d 2492 const struct pid_entry *p, *last;
28a6d671
EB		 2493 ino_t ino;
2494 int ret;
2495
2496 ret = -ENOENT;
2497 if (!task)
61a28784 2498 goto out_no_task;
28a6d671
EB		 2499
2500 ret = 0;
28a6d671
EB		 2501 i = filp->f_pos;
2502 switch (i) {
2503 case 0:
2504 ino = inode->i_ino;
2505 if (filldir(dirent, ".", 1, i, ino, DT_DIR) < 0)
2506 goto out;
2507 i++;
2508 filp->f_pos++;
2509 /* fall through */
2510 case 1:
2511 ino = parent_ino(dentry);
2512 if (filldir(dirent, "..", 2, i, ino, DT_DIR) < 0)
2513 goto out;
2514 i++;
2515 filp->f_pos++;
2516 /* fall through */
2517 default:
2518 i -= 2;
2519 if (i >= nents) {
2520 ret = 1;
2521 goto out;
2522 }
2523 p = ents + i;
7bcd6b0e
EB		 2524 last = &ents[nents - 1];
2525 while (p <= last) {
61a28784 2526 if (proc_pident_fill_cache(filp, dirent, filldir, task, p) < 0)
28a6d671
EB		 2527 goto out;
2528 filp->f_pos++;
2529 p++;
2530 }
2531 }
2532
2533 ret = 1;
2534out:
61a28784
EB		 2535 put_task_struct(task);
2536out_no_task:
28a6d671 2537 return ret;
1da177e4
LT		 2538}
2539
28a6d671
EB		 2540#ifdef CONFIG_SECURITY
2541static ssize_t proc_pid_attr_read(struct file * file, char __user * buf,
2542 size_t count, loff_t *ppos)
2543{
2fddfeef 2544 struct inode * inode = file->f_path.dentry->d_inode;
04ff9708 2545 char *p = NULL;
28a6d671
EB		 2546 ssize_t length;
2547 struct task_struct *task = get_proc_task(inode);
2548
28a6d671 2549 if (!task)
04ff9708 2550 return -ESRCH;
28a6d671
EB		 2551
2552 length = security_getprocattr(task,
2fddfeef 2553 (char*)file->f_path.dentry->d_name.name,
04ff9708 2554 &p);
28a6d671 2555 put_task_struct(task);
04ff9708
AV		 2556 if (length > 0)
2557 length = simple_read_from_buffer(buf, count, ppos, p, length);
2558 kfree(p);
28a6d671 2559 return length;
1da177e4
LT		 2560}
2561
28a6d671
EB		 2562static ssize_t proc_pid_attr_write(struct file * file, const char __user * buf,
2563 size_t count, loff_t *ppos)
2564{
2fddfeef 2565 struct inode * inode = file->f_path.dentry->d_inode;
28a6d671
EB		 2566 char *page;
2567 ssize_t length;
2568 struct task_struct *task = get_proc_task(inode);
2569
2570 length = -ESRCH;
2571 if (!task)
2572 goto out_no_task;
2573 if (count > PAGE_SIZE)
2574 count = PAGE_SIZE;
2575
2576 /* No partial writes. */
2577 length = -EINVAL;
2578 if (*ppos != 0)
2579 goto out;
2580
2581 length = -ENOMEM;
e12ba74d 2582 page = (char*)__get_free_page(GFP_TEMPORARY);
28a6d671
EB		 2583 if (!page)
2584 goto out;
2585
2586 length = -EFAULT;
2587 if (copy_from_user(page, buf, count))
2588 goto out_free;
2589
107db7c7 2590 /* Guard against adverse ptrace interaction */
9b1bf12d 2591 length = mutex_lock_interruptible(&task->signal->cred_guard_mutex);
107db7c7
DH		 2592 if (length < 0)
2593 goto out_free;
2594
28a6d671 2595 length = security_setprocattr(task,
2fddfeef 2596 (char*)file->f_path.dentry->d_name.name,
28a6d671 2597 (void*)page, count);
9b1bf12d 2598 mutex_unlock(&task->signal->cred_guard_mutex);
28a6d671
EB		 2599out_free:
2600 free_page((unsigned long) page);
2601out:
2602 put_task_struct(task);
2603out_no_task:
2604 return length;
2605}
2606
00977a59 2607static const struct file_operations proc_pid_attr_operations = {
28a6d671
EB		 2608 .read = proc_pid_attr_read,
2609 .write = proc_pid_attr_write,
87df8424 2610 .llseek = generic_file_llseek,
28a6d671
EB		 2611};
2612
c5141e6d 2613static const struct pid_entry attr_dir_stuff[] = {
631f9c18
AD		 2614 REG("current", S_IRUGO|S_IWUGO, proc_pid_attr_operations),
2615 REG("prev", S_IRUGO, proc_pid_attr_operations),
2616 REG("exec", S_IRUGO|S_IWUGO, proc_pid_attr_operations),
2617 REG("fscreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations),
2618 REG("keycreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations),
2619 REG("sockcreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations),
28a6d671
EB		 2620};
2621
72d9dcfc 2622static int proc_attr_dir_readdir(struct file * filp,
28a6d671
EB		 2623 void * dirent, filldir_t filldir)
2624{
2625 return proc_pident_readdir(filp,dirent,filldir,
72d9dcfc 2626 attr_dir_stuff,ARRAY_SIZE(attr_dir_stuff));
28a6d671
EB		 2627}
2628
00977a59 2629static const struct file_operations proc_attr_dir_operations = {
1da177e4 2630 .read = generic_read_dir,
72d9dcfc 2631 .readdir = proc_attr_dir_readdir,
6038f373 2632 .llseek = default_llseek,
1da177e4
LT		 2633};
2634
72d9dcfc 2635static struct dentry *proc_attr_dir_lookup(struct inode *dir,
00cd8dd3 2636 struct dentry *dentry, unsigned int flags)
28a6d671 2637{
7bcd6b0e
EB		 2638 return proc_pident_lookup(dir, dentry,
2639 attr_dir_stuff, ARRAY_SIZE(attr_dir_stuff));
28a6d671
EB		 2640}
2641
c5ef1c42 2642static const struct inode_operations proc_attr_dir_inode_operations = {
72d9dcfc 2643 .lookup = proc_attr_dir_lookup,
99f89551 2644 .getattr = pid_getattr,
6d76fa58 2645 .setattr = proc_setattr,
1da177e4
LT		 2646};
2647
28a6d671
EB		 2648#endif
2649
698ba7b5 2650#ifdef CONFIG_ELF_CORE
3cb4a0bb
KH		 2651static ssize_t proc_coredump_filter_read(struct file *file, char __user *buf,
2652 size_t count, loff_t *ppos)
2653{
2654 struct task_struct *task = get_proc_task(file->f_dentry->d_inode);
2655 struct mm_struct *mm;
2656 char buffer[PROC_NUMBUF];
2657 size_t len;
2658 int ret;
2659
2660 if (!task)
2661 return -ESRCH;
2662
2663 ret = 0;
2664 mm = get_task_mm(task);
2665 if (mm) {
2666 len = snprintf(buffer, sizeof(buffer), "%08lx\n",
2667 ((mm->flags & MMF_DUMP_FILTER_MASK) >>
2668 MMF_DUMP_FILTER_SHIFT));
2669 mmput(mm);
2670 ret = simple_read_from_buffer(buf, count, ppos, buffer, len);
2671 }
2672
2673 put_task_struct(task);
2674
2675 return ret;
2676}
2677
2678static ssize_t proc_coredump_filter_write(struct file *file,
2679 const char __user *buf,
2680 size_t count,
2681 loff_t *ppos)
2682{
2683 struct task_struct *task;
2684 struct mm_struct *mm;
2685 char buffer[PROC_NUMBUF], *end;
2686 unsigned int val;
2687 int ret;
2688 int i;
2689 unsigned long mask;
2690
2691 ret = -EFAULT;
2692 memset(buffer, 0, sizeof(buffer));
2693 if (count > sizeof(buffer) - 1)
2694 count = sizeof(buffer) - 1;
2695 if (copy_from_user(buffer, buf, count))
2696 goto out_no_task;
2697
2698 ret = -EINVAL;
2699 val = (unsigned int)simple_strtoul(buffer, &end, 0);
2700 if (*end == '\n')
2701 end++;
2702 if (end - buffer == 0)
2703 goto out_no_task;
2704
2705 ret = -ESRCH;
2706 task = get_proc_task(file->f_dentry->d_inode);
2707 if (!task)
2708 goto out_no_task;
2709
2710 ret = end - buffer;
2711 mm = get_task_mm(task);
2712 if (!mm)
2713 goto out_no_mm;
2714
2715 for (i = 0, mask = 1; i < MMF_DUMP_FILTER_BITS; i++, mask <<= 1) {
2716 if (val & mask)
2717 set_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags);
2718 else
2719 clear_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags);
2720 }
2721
2722 mmput(mm);
2723 out_no_mm:
2724 put_task_struct(task);
2725 out_no_task:
2726 return ret;
2727}
2728
2729static const struct file_operations proc_coredump_filter_operations = {
2730 .read = proc_coredump_filter_read,
2731 .write = proc_coredump_filter_write,
87df8424 2732 .llseek = generic_file_llseek,
3cb4a0bb
KH		 2733};
2734#endif
2735
28a6d671
EB		 2736/*
2737 * /proc/self:
2738 */
2739static int proc_self_readlink(struct dentry *dentry, char __user *buffer,
2740 int buflen)
2741{
488e5bc4 2742 struct pid_namespace *ns = dentry->d_sb->s_fs_info;
b55fcb22 2743 pid_t tgid = task_tgid_nr_ns(current, ns);
28a6d671 2744 char tmp[PROC_NUMBUF];
b55fcb22 2745 if (!tgid)
488e5bc4 2746 return -ENOENT;
b55fcb22 2747 sprintf(tmp, "%d", tgid);
28a6d671
EB		 2748 return vfs_readlink(dentry,buffer,buflen,tmp);
2749}
2750
2751static void *proc_self_follow_link(struct dentry *dentry, struct nameidata *nd)
2752{
488e5bc4 2753 struct pid_namespace *ns = dentry->d_sb->s_fs_info;
b55fcb22 2754 pid_t tgid = task_tgid_nr_ns(current, ns);
7fee4868
AV		 2755 char *name = ERR_PTR(-ENOENT);
2756 if (tgid) {
2757 name = __getname();
2758 if (!name)
2759 name = ERR_PTR(-ENOMEM);
2760 else
2761 sprintf(name, "%d", tgid);
2762 }
2763 nd_set_link(nd, name);
2764 return NULL;
2765}
2766
2767static void proc_self_put_link(struct dentry *dentry, struct nameidata *nd,
2768 void *cookie)
2769{
2770 char *s = nd_get_link(nd);
2771 if (!IS_ERR(s))
2772 __putname(s);
28a6d671
EB		 2773}
2774
c5ef1c42 2775static const struct inode_operations proc_self_inode_operations = {
28a6d671
EB		 2776 .readlink = proc_self_readlink,
2777 .follow_link = proc_self_follow_link,
7fee4868 2778 .put_link = proc_self_put_link,
28a6d671
EB		 2779};
2780
801199ce
EB		 2781/*
2782 * proc base
2783 *
2784 * These are the directory entries in the root directory of /proc
2785 * that properly belong to the /proc filesystem, as they describe
2786 * describe something that is process related.
2787 */
c5141e6d 2788static const struct pid_entry proc_base_stuff[] = {
61a28784 2789 NOD("self", S_IFLNK|S_IRWXUGO,
801199ce 2790 &proc_self_inode_operations, NULL, {}),
801199ce
EB		 2791};
2792
444ceed8 2793static struct dentry *proc_base_instantiate(struct inode *dir,
c5141e6d 2794 struct dentry *dentry, struct task_struct *task, const void *ptr)
801199ce 2795{
c5141e6d 2796 const struct pid_entry *p = ptr;
801199ce 2797 struct inode *inode;
801199ce 2798 struct proc_inode *ei;
73d36460 2799 struct dentry *error;
801199ce
EB		 2800
2801 /* Allocate the inode */
2802 error = ERR_PTR(-ENOMEM);
2803 inode = new_inode(dir->i_sb);
2804 if (!inode)
2805 goto out;
2806
2807 /* Initialize the inode */
2808 ei = PROC_I(inode);
85fe4025 2809 inode->i_ino = get_next_ino();
801199ce 2810 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
801199ce
EB		 2811
2812 /*
2813 * grab the reference to the task.
2814 */
1a657f78 2815 ei->pid = get_task_pid(task, PIDTYPE_PID);
801199ce
EB		 2816 if (!ei->pid)
2817 goto out_iput;
2818
801199ce
EB		 2819 inode->i_mode = p->mode;
2820 if (S_ISDIR(inode->i_mode))
bfe86848 2821 set_nlink(inode, 2);
801199ce
EB		 2822 if (S_ISLNK(inode->i_mode))
2823 inode->i_size = 64;
2824 if (p->iop)
2825 inode->i_op = p->iop;
2826 if (p->fop)
2827 inode->i_fop = p->fop;
2828 ei->op = p->op;
801199ce
EB		 2829 d_add(dentry, inode);
2830 error = NULL;
2831out:
801199ce
EB		 2832 return error;
2833out_iput:
2834 iput(inode);
2835 goto out;
2836}
2837
444ceed8
EB		 2838static struct dentry *proc_base_lookup(struct inode *dir, struct dentry *dentry)
2839{
2840 struct dentry *error;
2841 struct task_struct *task = get_proc_task(dir);
c5141e6d 2842 const struct pid_entry *p, *last;
444ceed8
EB		 2843
2844 error = ERR_PTR(-ENOENT);
2845
2846 if (!task)
2847 goto out_no_task;
2848
2849 /* Lookup the directory entry */
7bcd6b0e
EB		 2850 last = &proc_base_stuff[ARRAY_SIZE(proc_base_stuff) - 1];
2851 for (p = proc_base_stuff; p <= last; p++) {
444ceed8
EB		 2852 if (p->len != dentry->d_name.len)
2853 continue;
2854 if (!memcmp(dentry->d_name.name, p->name, p->len))
2855 break;
2856 }
7bcd6b0e 2857 if (p > last)
444ceed8
EB		 2858 goto out;
2859
2860 error = proc_base_instantiate(dir, dentry, task, p);
2861
2862out:
2863 put_task_struct(task);
2864out_no_task:
2865 return error;
2866}
2867
c5141e6d
ED		 2868static int proc_base_fill_cache(struct file *filp, void *dirent,
2869 filldir_t filldir, struct task_struct *task, const struct pid_entry *p)
61a28784
EB		 2870{
2871 return proc_fill_cache(filp, dirent, filldir, p->name, p->len,
2872 proc_base_instantiate, task, p);
2873}
2874
aba76fdb 2875#ifdef CONFIG_TASK_IO_ACCOUNTING
297c5d92
AR		 2876static int do_io_accounting(struct task_struct *task, char *buffer, int whole)
2877{
940389b8 2878 struct task_io_accounting acct = task->ioac;
5995477a 2879 unsigned long flags;
293eb1e7 2880 int result;
5995477a 2881
293eb1e7
VK		 2882 result = mutex_lock_killable(&task->signal->cred_guard_mutex);
2883 if (result)
2884 return result;
2885
2886 if (!ptrace_may_access(task, PTRACE_MODE_READ)) {
2887 result = -EACCES;
2888 goto out_unlock;
2889 }
1d1221f3 2890
5995477a
AR		 2891 if (whole && lock_task_sighand(task, &flags)) {
2892 struct task_struct *t = task;
2893
2894 task_io_accounting_add(&acct, &task->signal->ioac);
2895 while_each_thread(task, t)
2896 task_io_accounting_add(&acct, &t->ioac);
2897
2898 unlock_task_sighand(task, &flags);
297c5d92 2899 }
293eb1e7 2900 result = sprintf(buffer,
aba76fdb
AM		 2901 "rchar: %llu\n"
2902 "wchar: %llu\n"
2903 "syscr: %llu\n"
2904 "syscw: %llu\n"
2905 "read_bytes: %llu\n"
2906 "write_bytes: %llu\n"
2907 "cancelled_write_bytes: %llu\n",
7c44319d
AB		 2908 (unsigned long long)acct.rchar,
2909 (unsigned long long)acct.wchar,
2910 (unsigned long long)acct.syscr,
2911 (unsigned long long)acct.syscw,
2912 (unsigned long long)acct.read_bytes,
2913 (unsigned long long)acct.write_bytes,
2914 (unsigned long long)acct.cancelled_write_bytes);
293eb1e7
VK		 2915out_unlock:
2916 mutex_unlock(&task->signal->cred_guard_mutex);
2917 return result;
297c5d92
AR		 2918}
2919
2920static int proc_tid_io_accounting(struct task_struct *task, char *buffer)
2921{
2922 return do_io_accounting(task, buffer, 0);
aba76fdb 2923}
297c5d92
AR		 2924
2925static int proc_tgid_io_accounting(struct task_struct *task, char *buffer)
2926{
2927 return do_io_accounting(task, buffer, 1);
2928}
2929#endif /* CONFIG_TASK_IO_ACCOUNTING */
aba76fdb 2930
22d917d8
EB		 2931#ifdef CONFIG_USER_NS
2932static int proc_id_map_open(struct inode *inode, struct file *file,
2933 struct seq_operations *seq_ops)
2934{
2935 struct user_namespace *ns = NULL;
2936 struct task_struct *task;
2937 struct seq_file *seq;
2938 int ret = -EINVAL;
2939
2940 task = get_proc_task(inode);
2941 if (task) {
2942 rcu_read_lock();
2943 ns = get_user_ns(task_cred_xxx(task, user_ns));
2944 rcu_read_unlock();
2945 put_task_struct(task);
2946 }
2947 if (!ns)
2948 goto err;
2949
2950 ret = seq_open(file, seq_ops);
2951 if (ret)
2952 goto err_put_ns;
2953
2954 seq = file->private_data;
2955 seq->private = ns;
2956
2957 return 0;
2958err_put_ns:
2959 put_user_ns(ns);
2960err:
2961 return ret;
2962}
2963
2964static int proc_id_map_release(struct inode *inode, struct file *file)
2965{
2966 struct seq_file *seq = file->private_data;
2967 struct user_namespace *ns = seq->private;
2968 put_user_ns(ns);
2969 return seq_release(inode, file);
2970}
2971
2972static int proc_uid_map_open(struct inode *inode, struct file *file)
2973{
2974 return proc_id_map_open(inode, file, &proc_uid_seq_operations);
2975}
2976
2977static int proc_gid_map_open(struct inode *inode, struct file *file)
2978{
2979 return proc_id_map_open(inode, file, &proc_gid_seq_operations);
2980}
2981
2982static const struct file_operations proc_uid_map_operations = {
2983 .open = proc_uid_map_open,
2984 .write = proc_uid_map_write,
2985 .read = seq_read,
2986 .llseek = seq_lseek,
2987 .release = proc_id_map_release,
2988};
2989
2990static const struct file_operations proc_gid_map_operations = {
2991 .open = proc_gid_map_open,
2992 .write = proc_gid_map_write,
2993 .read = seq_read,
2994 .llseek = seq_lseek,
2995 .release = proc_id_map_release,
2996};
2997#endif /* CONFIG_USER_NS */
2998
47830723
KC		 2999static int proc_pid_personality(struct seq_file *m, struct pid_namespace *ns,
3000 struct pid *pid, struct task_struct *task)
3001{
a9712bc1
AV		 3002 int err = lock_trace(task);
3003 if (!err) {
3004 seq_printf(m, "%08x\n", task->personality);
3005 unlock_trace(task);
3006 }
3007 return err;
47830723
KC		 3008}
3009
28a6d671
EB		 3010/*
3011 * Thread groups
3012 */
00977a59 3013static const struct file_operations proc_task_operations;
c5ef1c42 3014static const struct inode_operations proc_task_inode_operations;
20cdc894 3015
c5141e6d 3016static const struct pid_entry tgid_base_stuff[] = {
631f9c18
AD		 3017 DIR("task", S_IRUGO|S_IXUGO, proc_task_inode_operations, proc_task_operations),
3018 DIR("fd", S_IRUSR|S_IXUSR, proc_fd_inode_operations, proc_fd_operations),
640708a2
PE		 3019#ifdef CONFIG_CHECKPOINT_RESTORE
3020 DIR("map_files", S_IRUSR|S_IXUSR, proc_map_files_inode_operations, proc_map_files_operations),
3021#endif
631f9c18 3022 DIR("fdinfo", S_IRUSR|S_IXUSR, proc_fdinfo_inode_operations, proc_fdinfo_operations),
6b4e306a 3023 DIR("ns", S_IRUSR|S_IXUGO, proc_ns_dir_inode_operations, proc_ns_dir_operations),
b2211a36 3024#ifdef CONFIG_NET
631f9c18 3025 DIR("net", S_IRUGO|S_IXUGO, proc_net_inode_operations, proc_net_operations),
b2211a36 3026#endif
631f9c18
AD		 3027 REG("environ", S_IRUSR, proc_environ_operations),
3028 INF("auxv", S_IRUSR, proc_pid_auxv),
3029 ONE("status", S_IRUGO, proc_pid_status),
a9712bc1 3030 ONE("personality", S_IRUGO, proc_pid_personality),
3036e7b4 3031 INF("limits", S_IRUGO, proc_pid_limits),
43ae34cb 3032#ifdef CONFIG_SCHED_DEBUG
631f9c18 3033 REG("sched", S_IRUGO|S_IWUSR, proc_pid_sched_operations),
5091faa4
MG		 3034#endif
3035#ifdef CONFIG_SCHED_AUTOGROUP
3036 REG("autogroup", S_IRUGO|S_IWUSR, proc_pid_sched_autogroup_operations),
ebcb6734 3037#endif
4614a696 3038 REG("comm", S_IRUGO|S_IWUSR, proc_pid_set_comm_operations),
ebcb6734 3039#ifdef CONFIG_HAVE_ARCH_TRACEHOOK
a9712bc1 3040 INF("syscall", S_IRUGO, proc_pid_syscall),
43ae34cb 3041#endif
631f9c18
AD		 3042 INF("cmdline", S_IRUGO, proc_pid_cmdline),
3043 ONE("stat", S_IRUGO, proc_tgid_stat),
3044 ONE("statm", S_IRUGO, proc_pid_statm),
b7643757 3045 REG("maps", S_IRUGO, proc_pid_maps_operations),
28a6d671 3046#ifdef CONFIG_NUMA
b7643757 3047 REG("numa_maps", S_IRUGO, proc_pid_numa_maps_operations),
28a6d671 3048#endif
631f9c18
AD		 3049 REG("mem", S_IRUSR|S_IWUSR, proc_mem_operations),
3050 LNK("cwd", proc_cwd_link),
3051 LNK("root", proc_root_link),
3052 LNK("exe", proc_exe_link),
3053 REG("mounts", S_IRUGO, proc_mounts_operations),
3054 REG("mountinfo", S_IRUGO, proc_mountinfo_operations),
3055 REG("mountstats", S_IRUSR, proc_mountstats_operations),
1e883281 3056#ifdef CONFIG_PROC_PAGE_MONITOR
631f9c18 3057 REG("clear_refs", S_IWUSR, proc_clear_refs_operations),
b7643757 3058 REG("smaps", S_IRUGO, proc_pid_smaps_operations),
ca6b0bf0 3059 REG("pagemap", S_IRUGO, proc_pagemap_operations),
28a6d671
EB		 3060#endif
3061#ifdef CONFIG_SECURITY
631f9c18 3062 DIR("attr", S_IRUGO|S_IXUGO, proc_attr_dir_inode_operations, proc_attr_dir_operations),
28a6d671
EB		 3063#endif
3064#ifdef CONFIG_KALLSYMS
631f9c18 3065 INF("wchan", S_IRUGO, proc_pid_wchan),
28a6d671 3066#endif
2ec220e2 3067#ifdef CONFIG_STACKTRACE
a9712bc1 3068 ONE("stack", S_IRUGO, proc_pid_stack),
28a6d671
EB		 3069#endif
3070#ifdef CONFIG_SCHEDSTATS
631f9c18 3071 INF("schedstat", S_IRUGO, proc_pid_schedstat),
28a6d671 3072#endif
9745512c 3073#ifdef CONFIG_LATENCYTOP
631f9c18 3074 REG("latency", S_IRUGO, proc_lstats_operations),
9745512c 3075#endif
8793d854 3076#ifdef CONFIG_PROC_PID_CPUSET
631f9c18 3077 REG("cpuset", S_IRUGO, proc_cpuset_operations),
a424316c
PM		 3078#endif
3079#ifdef CONFIG_CGROUPS
631f9c18 3080 REG("cgroup", S_IRUGO, proc_cgroup_operations),
28a6d671 3081#endif
631f9c18
AD		 3082 INF("oom_score", S_IRUGO, proc_oom_score),
3083 REG("oom_adj", S_IRUGO|S_IWUSR, proc_oom_adjust_operations),
a63d83f4 3084 REG("oom_score_adj", S_IRUGO|S_IWUSR, proc_oom_score_adj_operations),
28a6d671 3085#ifdef CONFIG_AUDITSYSCALL
631f9c18
AD		 3086 REG("loginuid", S_IWUSR|S_IRUGO, proc_loginuid_operations),
3087 REG("sessionid", S_IRUGO, proc_sessionid_operations),
28a6d671 3088#endif
f4f154fd 3089#ifdef CONFIG_FAULT_INJECTION
631f9c18 3090 REG("make-it-fail", S_IRUGO|S_IWUSR, proc_fault_inject_operations),
f4f154fd 3091#endif
698ba7b5 3092#ifdef CONFIG_ELF_CORE
631f9c18 3093 REG("coredump_filter", S_IRUGO|S_IWUSR, proc_coredump_filter_operations),
3cb4a0bb 3094#endif
aba76fdb 3095#ifdef CONFIG_TASK_IO_ACCOUNTING
1d1221f3 3096 INF("io", S_IRUSR, proc_tgid_io_accounting),
aba76fdb 3097#endif
f133ecca
CM		 3098#ifdef CONFIG_HARDWALL
3099 INF("hardwall", S_IRUGO, proc_pid_hardwall),
3100#endif
22d917d8
EB		 3101#ifdef CONFIG_USER_NS
3102 REG("uid_map", S_IRUGO|S_IWUSR, proc_uid_map_operations),
3103 REG("gid_map", S_IRUGO|S_IWUSR, proc_gid_map_operations),
3104#endif
28a6d671 3105};
1da177e4 3106
28a6d671 3107static int proc_tgid_base_readdir(struct file * filp,
1da177e4
LT		 3108 void * dirent, filldir_t filldir)
3109{
3110 return proc_pident_readdir(filp,dirent,filldir,
28a6d671 3111 tgid_base_stuff,ARRAY_SIZE(tgid_base_stuff));
1da177e4
LT		 3112}
3113
00977a59 3114static const struct file_operations proc_tgid_base_operations = {
1da177e4 3115 .read = generic_read_dir,
28a6d671 3116 .readdir = proc_tgid_base_readdir,
6038f373 3117 .llseek = default_llseek,
1da177e4
LT		 3118};
3119
00cd8dd3
AV		 3120static struct dentry *proc_tgid_base_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags)
3121{
7bcd6b0e
EB		 3122 return proc_pident_lookup(dir, dentry,
3123 tgid_base_stuff, ARRAY_SIZE(tgid_base_stuff));
1da177e4
LT		 3124}
3125
c5ef1c42 3126static const struct inode_operations proc_tgid_base_inode_operations = {
28a6d671 3127 .lookup = proc_tgid_base_lookup,
99f89551 3128 .getattr = pid_getattr,
6d76fa58 3129 .setattr = proc_setattr,
0499680a 3130 .permission = proc_pid_permission,
1da177e4 3131};
1da177e4 3132
60347f67 3133static void proc_flush_task_mnt(struct vfsmount *mnt, pid_t pid, pid_t tgid)
1da177e4 3134{
48e6484d 3135 struct dentry *dentry, *leader, *dir;
8578cea7 3136 char buf[PROC_NUMBUF];
48e6484d
EB		 3137 struct qstr name;
3138
3139 name.name = buf;
60347f67
PE		 3140 name.len = snprintf(buf, sizeof(buf), "%d", pid);
3141 dentry = d_hash_and_lookup(mnt->mnt_root, &name);
48e6484d 3142 if (dentry) {
29f12ca3 3143 shrink_dcache_parent(dentry);
48e6484d
EB		 3144 d_drop(dentry);
3145 dput(dentry);
3146 }
1da177e4 3147
48e6484d 3148 name.name = buf;
60347f67
PE		 3149 name.len = snprintf(buf, sizeof(buf), "%d", tgid);
3150 leader = d_hash_and_lookup(mnt->mnt_root, &name);
48e6484d
EB		 3151 if (!leader)
3152 goto out;
1da177e4 3153
48e6484d
EB		 3154 name.name = "task";
3155 name.len = strlen(name.name);
3156 dir = d_hash_and_lookup(leader, &name);
3157 if (!dir)
3158 goto out_put_leader;
3159
3160 name.name = buf;
60347f67 3161 name.len = snprintf(buf, sizeof(buf), "%d", pid);
48e6484d
EB		 3162 dentry = d_hash_and_lookup(dir, &name);
3163 if (dentry) {
3164 shrink_dcache_parent(dentry);
3165 d_drop(dentry);
3166 dput(dentry);
1da177e4 3167 }
48e6484d
EB		 3168
3169 dput(dir);
3170out_put_leader:
3171 dput(leader);
3172out:
3173 return;
1da177e4
LT		 3174}
3175
0895e91d
RD		 3176/**
3177 * proc_flush_task - Remove dcache entries for @task from the /proc dcache.
3178 * @task: task that should be flushed.
3179 *
3180 * When flushing dentries from proc, one needs to flush them from global
60347f67 3181 * proc (proc_mnt) and from all the namespaces' procs this task was seen
0895e91d
RD		 3182 * in. This call is supposed to do all of this job.
3183 *
3184 * Looks in the dcache for
3185 * /proc/@pid
3186 * /proc/@tgid/task/@pid
3187 * if either directory is present flushes it and all of it'ts children
3188 * from the dcache.
3189 *
3190 * It is safe and reasonable to cache /proc entries for a task until
3191 * that task exits. After that they just clog up the dcache with
3192 * useless entries, possibly causing useful dcache entries to be
3193 * flushed instead. This routine is proved to flush those useless
3194 * dcache entries at process exit time.
3195 *
3196 * NOTE: This routine is just an optimization so it does not guarantee
3197 * that no dcache entries will exist at process exit time it
3198 * just makes it very unlikely that any will persist.
60347f67
PE		 3199 */
3200
3201void proc_flush_task(struct task_struct *task)
3202{
9fcc2d15 3203 int i;
9b4d1cbe 3204 struct pid *pid, *tgid;
130f77ec
PE		 3205 struct upid *upid;
3206
130f77ec 3207 pid = task_pid(task);
9b4d1cbe 3208 tgid = task_tgid(task);
130f77ec 3209
9fcc2d15 3210 for (i = 0; i <= pid->level; i++) {
130f77ec
PE		 3211 upid = &pid->numbers[i];
3212 proc_flush_task_mnt(upid->ns->proc_mnt, upid->nr,
9b4d1cbe 3213 tgid->numbers[i].nr);
130f77ec 3214 }
6f4e6433
PE		 3215
3216 upid = &pid->numbers[pid->level];
3217 if (upid->nr == 1)
3218 pid_ns_release_proc(upid->ns);
60347f67
PE		 3219}
3220
9711ef99
AB		 3221static struct dentry *proc_pid_instantiate(struct inode *dir,
3222 struct dentry * dentry,
c5141e6d 3223 struct task_struct *task, const void *ptr)
444ceed8
EB		 3224{
3225 struct dentry *error = ERR_PTR(-ENOENT);
3226 struct inode *inode;
3227
61a28784 3228 inode = proc_pid_make_inode(dir->i_sb, task);
444ceed8
EB		 3229 if (!inode)
3230 goto out;
3231
3232 inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO;
3233 inode->i_op = &proc_tgid_base_inode_operations;
3234 inode->i_fop = &proc_tgid_base_operations;
3235 inode->i_flags|=S_IMMUTABLE;
aed54175 3236
bfe86848
MS		 3237 set_nlink(inode, 2 + pid_entry_count_dirs(tgid_base_stuff,
3238 ARRAY_SIZE(tgid_base_stuff)));
444ceed8 3239
fb045adb 3240 d_set_d_op(dentry, &pid_dentry_operations);
444ceed8
EB		 3241
3242 d_add(dentry, inode);
3243 /* Close the race of the process dying before we return the dentry */
0b728e19 3244 if (pid_revalidate(dentry, 0))
444ceed8
EB		 3245 error = NULL;
3246out:
3247 return error;
3248}
3249
00cd8dd3 3250struct dentry *proc_pid_lookup(struct inode *dir, struct dentry * dentry, unsigned int flags)
1da177e4 3251{
73d36460 3252 struct dentry *result;
1da177e4 3253 struct task_struct *task;
1da177e4 3254 unsigned tgid;
b488893a 3255 struct pid_namespace *ns;
1da177e4 3256
801199ce
EB		 3257 result = proc_base_lookup(dir, dentry);
3258 if (!IS_ERR(result) || PTR_ERR(result) != -ENOENT)
3259 goto out;
3260
1da177e4
LT		 3261 tgid = name_to_int(dentry);
3262 if (tgid == ~0U)
3263 goto out;
3264
b488893a 3265 ns = dentry->d_sb->s_fs_info;
de758734 3266 rcu_read_lock();
b488893a 3267 task = find_task_by_pid_ns(tgid, ns);
1da177e4
LT		 3268 if (task)
3269 get_task_struct(task);
de758734 3270 rcu_read_unlock();
1da177e4
LT		 3271 if (!task)
3272 goto out;
3273
444ceed8 3274 result = proc_pid_instantiate(dir, dentry, task, NULL);
1da177e4 3275 put_task_struct(task);
1da177e4 3276out:
cd6a3ce9 3277 return result;
1da177e4
LT		 3278}
3279
1da177e4 3280/*
0804ef4b 3281 * Find the first task with tgid >= tgid
0bc58a91 3282 *
1da177e4 3283 */
19fd4bb2
EB		 3284struct tgid_iter {
3285 unsigned int tgid;
0804ef4b 3286 struct task_struct *task;
19fd4bb2
EB		 3287};
3288static struct tgid_iter next_tgid(struct pid_namespace *ns, struct tgid_iter iter)
3289{
0804ef4b 3290 struct pid *pid;
1da177e4 3291
19fd4bb2
EB		 3292 if (iter.task)
3293 put_task_struct(iter.task);
454cc105 3294 rcu_read_lock();
0804ef4b 3295retry:
19fd4bb2
EB		 3296 iter.task = NULL;
3297 pid = find_ge_pid(iter.tgid, ns);
0804ef4b 3298 if (pid) {
19fd4bb2
EB		 3299 iter.tgid = pid_nr_ns(pid, ns);
3300 iter.task = pid_task(pid, PIDTYPE_PID);
0804ef4b
EB		 3301 /* What we to know is if the pid we have find is the
3302 * pid of a thread_group_leader. Testing for task
3303 * being a thread_group_leader is the obvious thing
3304 * todo but there is a window when it fails, due to
3305 * the pid transfer logic in de_thread.
3306 *
3307 * So we perform the straight forward test of seeing
3308 * if the pid we have found is the pid of a thread
3309 * group leader, and don't worry if the task we have
3310 * found doesn't happen to be a thread group leader.
3311 * As we don't care in the case of readdir.
3312 */
19fd4bb2
EB		 3313 if (!iter.task || !has_group_leader_pid(iter.task)) {
3314 iter.tgid += 1;
0804ef4b 3315 goto retry;
19fd4bb2
EB		 3316 }
3317 get_task_struct(iter.task);
0bc58a91 3318 }
454cc105 3319 rcu_read_unlock();
19fd4bb2 3320 return iter;
1da177e4
LT		 3321}
3322
7bcd6b0e 3323#define TGID_OFFSET (FIRST_PROCESS_ENTRY + ARRAY_SIZE(proc_base_stuff))
0804ef4b 3324
61a28784 3325static int proc_pid_fill_cache(struct file *filp, void *dirent, filldir_t filldir,
19fd4bb2 3326 struct tgid_iter iter)
61a28784
EB		 3327{
3328 char name[PROC_NUMBUF];
19fd4bb2 3329 int len = snprintf(name, sizeof(name), "%d", iter.tgid);
61a28784 3330 return proc_fill_cache(filp, dirent, filldir, name, len,
19fd4bb2 3331 proc_pid_instantiate, iter.task, NULL);
61a28784
EB		 3332}
3333
0499680a
VK		 3334static int fake_filldir(void *buf, const char *name, int namelen,
3335 loff_t offset, u64 ino, unsigned d_type)
3336{
3337 return 0;
3338}
3339
1da177e4
LT		 3340/* for the /proc/ directory itself, after non-process stuff has been done */
3341int proc_pid_readdir(struct file * filp, void * dirent, filldir_t filldir)
3342{
d8bdc59f
LT		 3343 unsigned int nr;
3344 struct task_struct *reaper;
19fd4bb2 3345 struct tgid_iter iter;
b488893a 3346 struct pid_namespace *ns;
0499680a 3347 filldir_t __filldir;
1da177e4 3348
d8bdc59f
LT		 3349 if (filp->f_pos >= PID_MAX_LIMIT + TGID_OFFSET)
3350 goto out_no_task;
3351 nr = filp->f_pos - FIRST_PROCESS_ENTRY;
3352
3353 reaper = get_proc_task(filp->f_path.dentry->d_inode);
61a28784
EB		 3354 if (!reaper)
3355 goto out_no_task;
3356
7bcd6b0e 3357 for (; nr < ARRAY_SIZE(proc_base_stuff); filp->f_pos++, nr++) {
c5141e6d 3358 const struct pid_entry *p = &proc_base_stuff[nr];
61a28784 3359 if (proc_base_fill_cache(filp, dirent, filldir, reaper, p) < 0)
801199ce 3360 goto out;
1da177e4
LT		 3361 }
3362
b488893a 3363 ns = filp->f_dentry->d_sb->s_fs_info;
19fd4bb2
EB		 3364 iter.task = NULL;
3365 iter.tgid = filp->f_pos - TGID_OFFSET;
3366 for (iter = next_tgid(ns, iter);
3367 iter.task;
3368 iter.tgid += 1, iter = next_tgid(ns, iter)) {
0499680a
VK		 3369 if (has_pid_permissions(ns, iter.task, 2))
3370 __filldir = filldir;
3371 else
3372 __filldir = fake_filldir;
3373
19fd4bb2 3374 filp->f_pos = iter.tgid + TGID_OFFSET;
0499680a 3375 if (proc_pid_fill_cache(filp, dirent, __filldir, iter) < 0) {
19fd4bb2 3376 put_task_struct(iter.task);
0804ef4b 3377 goto out;
1da177e4 3378 }
0bc58a91 3379 }
0804ef4b
EB		 3380 filp->f_pos = PID_MAX_LIMIT + TGID_OFFSET;
3381out:
61a28784
EB		 3382 put_task_struct(reaper);
3383out_no_task:
0bc58a91
EB		 3384 return 0;
3385}
1da177e4 3386
28a6d671
EB		 3387/*
3388 * Tasks
3389 */
c5141e6d 3390static const struct pid_entry tid_base_stuff[] = {
631f9c18 3391 DIR("fd", S_IRUSR|S_IXUSR, proc_fd_inode_operations, proc_fd_operations),
3835541d 3392 DIR("fdinfo", S_IRUSR|S_IXUSR, proc_fdinfo_inode_operations, proc_fdinfo_operations),
6b4e306a 3393 DIR("ns", S_IRUSR|S_IXUGO, proc_ns_dir_inode_operations, proc_ns_dir_operations),
631f9c18
AD		 3394 REG("environ", S_IRUSR, proc_environ_operations),
3395 INF("auxv", S_IRUSR, proc_pid_auxv),
3396 ONE("status", S_IRUGO, proc_pid_status),
a9712bc1 3397 ONE("personality", S_IRUGO, proc_pid_personality),
3036e7b4 3398 INF("limits", S_IRUGO, proc_pid_limits),
43ae34cb 3399#ifdef CONFIG_SCHED_DEBUG
631f9c18 3400 REG("sched", S_IRUGO|S_IWUSR, proc_pid_sched_operations),
ebcb6734 3401#endif
4614a696 3402 REG("comm", S_IRUGO|S_IWUSR, proc_pid_set_comm_operations),
ebcb6734 3403#ifdef CONFIG_HAVE_ARCH_TRACEHOOK
a9712bc1 3404 INF("syscall", S_IRUGO, proc_pid_syscall),
43ae34cb 3405#endif
631f9c18
AD		 3406 INF("cmdline", S_IRUGO, proc_pid_cmdline),
3407 ONE("stat", S_IRUGO, proc_tid_stat),
3408 ONE("statm", S_IRUGO, proc_pid_statm),
b7643757 3409 REG("maps", S_IRUGO, proc_tid_maps_operations),
81841161
CG		 3410#ifdef CONFIG_CHECKPOINT_RESTORE
3411 REG("children", S_IRUGO, proc_tid_children_operations),
3412#endif
28a6d671 3413#ifdef CONFIG_NUMA
b7643757 3414 REG("numa_maps", S_IRUGO, proc_tid_numa_maps_operations),
28a6d671 3415#endif
631f9c18
AD		 3416 REG("mem", S_IRUSR|S_IWUSR, proc_mem_operations),
3417 LNK("cwd", proc_cwd_link),
3418 LNK("root", proc_root_link),
3419 LNK("exe", proc_exe_link),
3420 REG("mounts", S_IRUGO, proc_mounts_operations),
3421 REG("mountinfo", S_IRUGO, proc_mountinfo_operations),
1e883281 3422#ifdef CONFIG_PROC_PAGE_MONITOR
631f9c18 3423 REG("clear_refs", S_IWUSR, proc_clear_refs_operations),
b7643757 3424 REG("smaps", S_IRUGO, proc_tid_smaps_operations),
ca6b0bf0 3425 REG("pagemap", S_IRUGO, proc_pagemap_operations),
28a6d671
EB		 3426#endif
3427#ifdef CONFIG_SECURITY
631f9c18 3428 DIR("attr", S_IRUGO|S_IXUGO, proc_attr_dir_inode_operations, proc_attr_dir_operations),
28a6d671
EB		 3429#endif
3430#ifdef CONFIG_KALLSYMS
631f9c18 3431 INF("wchan", S_IRUGO, proc_pid_wchan),
28a6d671 3432#endif
2ec220e2 3433#ifdef CONFIG_STACKTRACE
a9712bc1 3434 ONE("stack", S_IRUGO, proc_pid_stack),
28a6d671
EB		 3435#endif
3436#ifdef CONFIG_SCHEDSTATS
631f9c18 3437 INF("schedstat", S_IRUGO, proc_pid_schedstat),
28a6d671 3438#endif
9745512c 3439#ifdef CONFIG_LATENCYTOP
631f9c18 3440 REG("latency", S_IRUGO, proc_lstats_operations),
9745512c 3441#endif
8793d854 3442#ifdef CONFIG_PROC_PID_CPUSET
631f9c18 3443 REG("cpuset", S_IRUGO, proc_cpuset_operations),
a424316c
PM		 3444#endif
3445#ifdef CONFIG_CGROUPS
631f9c18 3446 REG("cgroup", S_IRUGO, proc_cgroup_operations),
28a6d671 3447#endif
631f9c18
AD		 3448 INF("oom_score", S_IRUGO, proc_oom_score),
3449 REG("oom_adj", S_IRUGO|S_IWUSR, proc_oom_adjust_operations),
a63d83f4 3450 REG("oom_score_adj", S_IRUGO|S_IWUSR, proc_oom_score_adj_operations),
28a6d671 3451#ifdef CONFIG_AUDITSYSCALL
631f9c18 3452 REG("loginuid", S_IWUSR|S_IRUGO, proc_loginuid_operations),
26ec3c64 3453 REG("sessionid", S_IRUGO, proc_sessionid_operations),
28a6d671 3454#endif
f4f154fd 3455#ifdef CONFIG_FAULT_INJECTION
631f9c18 3456 REG("make-it-fail", S_IRUGO|S_IWUSR, proc_fault_inject_operations),
f4f154fd 3457#endif
297c5d92 3458#ifdef CONFIG_TASK_IO_ACCOUNTING
1d1221f3 3459 INF("io", S_IRUSR, proc_tid_io_accounting),
297c5d92 3460#endif
f133ecca
CM		 3461#ifdef CONFIG_HARDWALL
3462 INF("hardwall", S_IRUGO, proc_pid_hardwall),
3463#endif
22d917d8
EB		 3464#ifdef CONFIG_USER_NS
3465 REG("uid_map", S_IRUGO|S_IWUSR, proc_uid_map_operations),
3466 REG("gid_map", S_IRUGO|S_IWUSR, proc_gid_map_operations),
3467#endif
28a6d671
EB		 3468};
3469
3470static int proc_tid_base_readdir(struct file * filp,
3471 void * dirent, filldir_t filldir)
3472{
3473 return proc_pident_readdir(filp,dirent,filldir,
3474 tid_base_stuff,ARRAY_SIZE(tid_base_stuff));
3475}
3476
00cd8dd3
AV		 3477static struct dentry *proc_tid_base_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags)
3478{
7bcd6b0e
EB		 3479 return proc_pident_lookup(dir, dentry,
3480 tid_base_stuff, ARRAY_SIZE(tid_base_stuff));
28a6d671
EB		 3481}
3482
00977a59 3483static const struct file_operations proc_tid_base_operations = {
28a6d671
EB		 3484 .read = generic_read_dir,
3485 .readdir = proc_tid_base_readdir,
6038f373 3486 .llseek = default_llseek,
28a6d671
EB		 3487};
3488
c5ef1c42 3489static const struct inode_operations proc_tid_base_inode_operations = {
28a6d671
EB		 3490 .lookup = proc_tid_base_lookup,
3491 .getattr = pid_getattr,
3492 .setattr = proc_setattr,
3493};
3494
444ceed8 3495static struct dentry *proc_task_instantiate(struct inode *dir,
c5141e6d 3496 struct dentry *dentry, struct task_struct *task, const void *ptr)
444ceed8
EB		 3497{
3498 struct dentry *error = ERR_PTR(-ENOENT);
3499 struct inode *inode;
61a28784 3500 inode = proc_pid_make_inode(dir->i_sb, task);
444ceed8
EB		 3501
3502 if (!inode)
3503 goto out;
3504 inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO;
3505 inode->i_op = &proc_tid_base_inode_operations;
3506 inode->i_fop = &proc_tid_base_operations;
3507 inode->i_flags|=S_IMMUTABLE;
aed54175 3508
bfe86848
MS		 3509 set_nlink(inode, 2 + pid_entry_count_dirs(tid_base_stuff,
3510 ARRAY_SIZE(tid_base_stuff)));
444ceed8 3511
fb045adb 3512 d_set_d_op(dentry, &pid_dentry_operations);
444ceed8
EB		 3513
3514 d_add(dentry, inode);
3515 /* Close the race of the process dying before we return the dentry */
0b728e19 3516 if (pid_revalidate(dentry, 0))
444ceed8
EB		 3517 error = NULL;
3518out:
3519 return error;
3520}
3521
00cd8dd3 3522static struct dentry *proc_task_lookup(struct inode *dir, struct dentry * dentry, unsigned int flags)
28a6d671
EB		 3523{
3524 struct dentry *result = ERR_PTR(-ENOENT);
3525 struct task_struct *task;
3526 struct task_struct *leader = get_proc_task(dir);
28a6d671 3527 unsigned tid;
b488893a 3528 struct pid_namespace *ns;
28a6d671
EB		 3529
3530 if (!leader)
3531 goto out_no_task;
3532
3533 tid = name_to_int(dentry);
3534 if (tid == ~0U)
3535 goto out;
3536
b488893a 3537 ns = dentry->d_sb->s_fs_info;
28a6d671 3538 rcu_read_lock();
b488893a 3539 task = find_task_by_pid_ns(tid, ns);
28a6d671
EB		 3540 if (task)
3541 get_task_struct(task);
3542 rcu_read_unlock();
3543 if (!task)
3544 goto out;
bac0abd6 3545 if (!same_thread_group(leader, task))
28a6d671
EB		 3546 goto out_drop_task;
3547
444ceed8 3548 result = proc_task_instantiate(dir, dentry, task, NULL);
28a6d671
EB		 3549out_drop_task:
3550 put_task_struct(task);
3551out:
3552 put_task_struct(leader);
3553out_no_task:
3554 return result;
3555}
3556
0bc58a91
EB		 3557/*
3558 * Find the first tid of a thread group to return to user space.
3559 *
3560 * Usually this is just the thread group leader, but if the users
3561 * buffer was too small or there was a seek into the middle of the
3562 * directory we have more work todo.
3563 *
3564 * In the case of a short read we start with find_task_by_pid.
3565 *
3566 * In the case of a seek we start with the leader and walk nr
3567 * threads past it.
3568 */
cc288738 3569static struct task_struct *first_tid(struct task_struct *leader,
b488893a 3570 int tid, int nr, struct pid_namespace *ns)
0bc58a91 3571{
a872ff0c 3572 struct task_struct *pos;
1da177e4 3573
cc288738 3574 rcu_read_lock();
0bc58a91
EB		 3575 /* Attempt to start with the pid of a thread */
3576 if (tid && (nr > 0)) {
b488893a 3577 pos = find_task_by_pid_ns(tid, ns);
a872ff0c
ON		 3578 if (pos && (pos->group_leader == leader))
3579 goto found;
0bc58a91 3580 }
1da177e4 3581
0bc58a91 3582 /* If nr exceeds the number of threads there is nothing todo */
a872ff0c
ON		 3583 pos = NULL;
3584 if (nr && nr >= get_nr_threads(leader))
3585 goto out;
1da177e4 3586
a872ff0c
ON		 3587 /* If we haven't found our starting place yet start
3588 * with the leader and walk nr threads forward.
0bc58a91 3589 */
a872ff0c
ON		 3590 for (pos = leader; nr > 0; --nr) {
3591 pos = next_thread(pos);
3592 if (pos == leader) {
3593 pos = NULL;
3594 goto out;
3595 }
1da177e4 3596 }
a872ff0c
ON		 3597found:
3598 get_task_struct(pos);
3599out:
cc288738 3600 rcu_read_unlock();
0bc58a91
EB		 3601 return pos;
3602}
3603
3604/*
3605 * Find the next thread in the thread list.
3606 * Return NULL if there is an error or no next thread.
3607 *
3608 * The reference to the input task_struct is released.
3609 */
3610static struct task_struct *next_tid(struct task_struct *start)
3611{
c1df7fb8 3612 struct task_struct *pos = NULL;
cc288738 3613 rcu_read_lock();
c1df7fb8 3614 if (pid_alive(start)) {
0bc58a91 3615 pos = next_thread(start);
c1df7fb8
ON		 3616 if (thread_group_leader(pos))
3617 pos = NULL;
3618 else
3619 get_task_struct(pos);
3620 }
cc288738 3621 rcu_read_unlock();
0bc58a91
EB		 3622 put_task_struct(start);
3623 return pos;
1da177e4
LT		 3624}
3625
61a28784
EB		 3626static int proc_task_fill_cache(struct file *filp, void *dirent, filldir_t filldir,
3627 struct task_struct *task, int tid)
3628{
3629 char name[PROC_NUMBUF];
3630 int len = snprintf(name, sizeof(name), "%d", tid);
3631 return proc_fill_cache(filp, dirent, filldir, name, len,
3632 proc_task_instantiate, task, NULL);
3633}
3634
1da177e4
LT		 3635/* for the /proc/TGID/task/ directories */
3636static int proc_task_readdir(struct file * filp, void * dirent, filldir_t filldir)
3637{
2fddfeef 3638 struct dentry *dentry = filp->f_path.dentry;
1da177e4 3639 struct inode *inode = dentry->d_inode;
7d895244 3640 struct task_struct *leader = NULL;
0bc58a91 3641 struct task_struct *task;
1da177e4
LT		 3642 int retval = -ENOENT;
3643 ino_t ino;
0bc58a91 3644 int tid;
b488893a 3645 struct pid_namespace *ns;
1da177e4 3646
7d895244
GC		 3647 task = get_proc_task(inode);
3648 if (!task)
3649 goto out_no_task;
3650 rcu_read_lock();
3651 if (pid_alive(task)) {
3652 leader = task->group_leader;
3653 get_task_struct(leader);
3654 }
3655 rcu_read_unlock();
3656 put_task_struct(task);
99f89551
EB		 3657 if (!leader)
3658 goto out_no_task;
1da177e4
LT		 3659 retval = 0;
3660
ee568b25 3661 switch ((unsigned long)filp->f_pos) {
1da177e4
LT		 3662 case 0:
3663 ino = inode->i_ino;
ee6f779b 3664 if (filldir(dirent, ".", 1, filp->f_pos, ino, DT_DIR) < 0)
1da177e4 3665 goto out;
ee6f779b 3666 filp->f_pos++;
1da177e4
LT		 3667 /* fall through */
3668 case 1:
3669 ino = parent_ino(dentry);
ee6f779b 3670 if (filldir(dirent, "..", 2, filp->f_pos, ino, DT_DIR) < 0)
1da177e4 3671 goto out;
ee6f779b 3672 filp->f_pos++;
1da177e4
LT		 3673 /* fall through */
3674 }
3675
0bc58a91
EB		 3676 /* f_version caches the tgid value that the last readdir call couldn't
3677 * return. lseek aka telldir automagically resets f_version to 0.
3678 */
b488893a 3679 ns = filp->f_dentry->d_sb->s_fs_info;
2b47c361 3680 tid = (int)filp->f_version;
0bc58a91 3681 filp->f_version = 0;
ee6f779b 3682 for (task = first_tid(leader, tid, filp->f_pos - 2, ns);
0bc58a91 3683 task;
ee6f779b 3684 task = next_tid(task), filp->f_pos++) {
b488893a 3685 tid = task_pid_nr_ns(task, ns);
61a28784 3686 if (proc_task_fill_cache(filp, dirent, filldir, task, tid) < 0) {
0bc58a91
EB		 3687 /* returning this tgid failed, save it as the first
3688 * pid for the next readir call */
2b47c361 3689 filp->f_version = (u64)tid;
0bc58a91 3690 put_task_struct(task);
1da177e4 3691 break;
0bc58a91 3692 }
1da177e4
LT		 3693 }
3694out:
99f89551
EB		 3695 put_task_struct(leader);
3696out_no_task:
1da177e4
LT		 3697 return retval;
3698}
6e66b52b
EB		 3699
3700static int proc_task_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
3701{
3702 struct inode *inode = dentry->d_inode;
99f89551 3703 struct task_struct *p = get_proc_task(inode);
6e66b52b
EB		 3704 generic_fillattr(inode, stat);
3705
99f89551 3706 if (p) {
99f89551 3707 stat->nlink += get_nr_threads(p);
99f89551 3708 put_task_struct(p);
6e66b52b
EB		 3709 }
3710
3711 return 0;
3712}
28a6d671 3713
c5ef1c42 3714static const struct inode_operations proc_task_inode_operations = {
28a6d671
EB		 3715 .lookup = proc_task_lookup,
3716 .getattr = proc_task_getattr,
3717 .setattr = proc_setattr,
0499680a 3718 .permission = proc_pid_permission,
28a6d671
EB		 3719};
3720
00977a59 3721static const struct file_operations proc_task_operations = {
28a6d671
EB		 3722 .read = generic_read_dir,
3723 .readdir = proc_task_readdir,
6038f373 3724 .llseek = default_llseek,
28a6d671 3725};
Linux kernel - Deliverables
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