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Merge branch 'slab/urgent' of git://git.kernel.org/pub/scm/linux/kernel/git/penberg...
[deliverable/linux.git] / fs / proc / base.c
CommitLineData
1da177e4
LT		 1/*
2 * linux/fs/proc/base.c
3 *
4 * Copyright (C) 1991, 1992 Linus Torvalds
5 *
6 * proc base directory handling functions
7 *
8 * 1999, Al Viro. Rewritten. Now it covers the whole per-process part.
9 * Instead of using magical inumbers to determine the kind of object
10 * we allocate and fill in-core inodes upon lookup. They don't even
11 * go into icache. We cache the reference to task_struct upon lookup too.
12 * Eventually it should become a filesystem in its own. We don't use the
13 * rest of procfs anymore.
e070ad49
ML		 14 *
15 *
16 * Changelog:
17 * 17-Jan-2005
18 * Allan Bezerra
19 * Bruna Moreira <bruna.moreira@indt.org.br>
20 * Edjard Mota <edjard.mota@indt.org.br>
21 * Ilias Biris <ilias.biris@indt.org.br>
22 * Mauricio Lin <mauricio.lin@indt.org.br>
23 *
24 * Embedded Linux Lab - 10LE Instituto Nokia de Tecnologia - INdT
25 *
26 * A new process specific entry (smaps) included in /proc. It shows the
27 * size of rss for each memory area. The maps entry lacks information
28 * about physical memory size (rss) for each mapped file, i.e.,
29 * rss information for executables and library files.
30 * This additional information is useful for any tools that need to know
31 * about physical memory consumption for a process specific library.
32 *
33 * Changelog:
34 * 21-Feb-2005
35 * Embedded Linux Lab - 10LE Instituto Nokia de Tecnologia - INdT
36 * Pud inclusion in the page table walking.
37 *
38 * ChangeLog:
39 * 10-Mar-2005
40 * 10LE Instituto Nokia de Tecnologia - INdT:
41 * A better way to walks through the page table as suggested by Hugh Dickins.
42 *
43 * Simo Piiroinen <simo.piiroinen@nokia.com>:
44 * Smaps information related to shared, private, clean and dirty pages.
45 *
46 * Paul Mundt <paul.mundt@nokia.com>:
47 * Overall revision about smaps.
1da177e4
LT		 48 */
49
50#include <asm/uaccess.h>
51
1da177e4
LT		 52#include <linux/errno.h>
53#include <linux/time.h>
54#include <linux/proc_fs.h>
55#include <linux/stat.h>
5995477a 56#include <linux/task_io_accounting_ops.h>
1da177e4 57#include <linux/init.h>
16f7e0fe 58#include <linux/capability.h>
1da177e4 59#include <linux/file.h>
9f3acc31 60#include <linux/fdtable.h>
1da177e4
LT		 61#include <linux/string.h>
62#include <linux/seq_file.h>
63#include <linux/namei.h>
6b3286ed 64#include <linux/mnt_namespace.h>
1da177e4 65#include <linux/mm.h>
a63d83f4 66#include <linux/swap.h>
b835996f 67#include <linux/rcupdate.h>
1da177e4 68#include <linux/kallsyms.h>
2ec220e2 69#include <linux/stacktrace.h>
d85f50d5 70#include <linux/resource.h>
5096add8 71#include <linux/module.h>
1da177e4
LT		 72#include <linux/mount.h>
73#include <linux/security.h>
74#include <linux/ptrace.h>
0d094efe 75#include <linux/tracehook.h>
a424316c 76#include <linux/cgroup.h>
1da177e4
LT		 77#include <linux/cpuset.h>
78#include <linux/audit.h>
5addc5dd 79#include <linux/poll.h>
1651e14e 80#include <linux/nsproxy.h>
8ac773b4 81#include <linux/oom.h>
3cb4a0bb 82#include <linux/elf.h>
60347f67 83#include <linux/pid_namespace.h>
5ad4e53b 84#include <linux/fs_struct.h>
5a0e3ad6 85#include <linux/slab.h>
f133ecca
CM		 86#ifdef CONFIG_HARDWALL
87#include <asm/hardwall.h>
88#endif
1da177e4
LT		 89#include "internal.h"
90
0f2fe20f
EB		 91/* NOTE:
92 * Implementing inode permission operations in /proc is almost
93 * certainly an error. Permission checks need to happen during
94 * each system call not at open time. The reason is that most of
95 * what we wish to check for permissions in /proc varies at runtime.
96 *
97 * The classic example of a problem is opening file descriptors
98 * in /proc for a task before it execs a suid executable.
99 */
100
1da177e4 101struct pid_entry {
1da177e4 102 char *name;
c5141e6d 103 int len;
1da177e4 104 mode_t mode;
c5ef1c42 105 const struct inode_operations *iop;
00977a59 106 const struct file_operations *fop;
20cdc894 107 union proc_op op;
1da177e4
LT		 108};
109
61a28784 110#define NOD(NAME, MODE, IOP, FOP, OP) { \
20cdc894 111 .name = (NAME), \
c5141e6d 112 .len = sizeof(NAME) - 1, \
20cdc894
EB		 113 .mode = MODE, \
114 .iop = IOP, \
115 .fop = FOP, \
116 .op = OP, \
117}
118
631f9c18
AD		 119#define DIR(NAME, MODE, iops, fops) \
120 NOD(NAME, (S_IFDIR|(MODE)), &iops, &fops, {} )
121#define LNK(NAME, get_link) \
61a28784 122 NOD(NAME, (S_IFLNK|S_IRWXUGO), \
20cdc894 123 &proc_pid_link_inode_operations, NULL, \
631f9c18
AD		 124 { .proc_get_link = get_link } )
125#define REG(NAME, MODE, fops) \
126 NOD(NAME, (S_IFREG|(MODE)), NULL, &fops, {})
127#define INF(NAME, MODE, read) \
61a28784 128 NOD(NAME, (S_IFREG|(MODE)), \
20cdc894 129 NULL, &proc_info_file_operations, \
631f9c18
AD		 130 { .proc_read = read } )
131#define ONE(NAME, MODE, show) \
be614086
EB		 132 NOD(NAME, (S_IFREG|(MODE)), \
133 NULL, &proc_single_file_operations, \
631f9c18 134 { .proc_show = show } )
1da177e4 135
aed54175
VN		 136/*
137 * Count the number of hardlinks for the pid_entry table, excluding the .
138 * and .. links.
139 */
140static unsigned int pid_entry_count_dirs(const struct pid_entry *entries,
141 unsigned int n)
142{
143 unsigned int i;
144 unsigned int count;
145
146 count = 0;
147 for (i = 0; i < n; ++i) {
148 if (S_ISDIR(entries[i].mode))
149 ++count;
150 }
151
152 return count;
153}
154
f7ad3c6b 155static int get_task_root(struct task_struct *task, struct path *root)
1da177e4 156{
7c2c7d99
HD		 157 int result = -ENOENT;
158
0494f6ec 159 task_lock(task);
f7ad3c6b
MS		 160 if (task->fs) {
161 get_fs_root(task->fs, root);
7c2c7d99
HD		 162 result = 0;
163 }
0494f6ec 164 task_unlock(task);
7c2c7d99 165 return result;
0494f6ec
MS		 166}
167
3dcd25f3 168static int proc_cwd_link(struct inode *inode, struct path *path)
0494f6ec 169{
99f89551 170 struct task_struct *task = get_proc_task(inode);
0494f6ec 171 int result = -ENOENT;
99f89551
EB		 172
173 if (task) {
f7ad3c6b
MS		 174 task_lock(task);
175 if (task->fs) {
176 get_fs_pwd(task->fs, path);
177 result = 0;
178 }
179 task_unlock(task);
99f89551
EB		 180 put_task_struct(task);
181 }
1da177e4
LT		 182 return result;
183}
184
3dcd25f3 185static int proc_root_link(struct inode *inode, struct path *path)
1da177e4 186{
99f89551 187 struct task_struct *task = get_proc_task(inode);
1da177e4 188 int result = -ENOENT;
99f89551
EB		 189
190 if (task) {
f7ad3c6b 191 result = get_task_root(task, path);
99f89551
EB		 192 put_task_struct(task);
193 }
1da177e4
LT		 194 return result;
195}
196
8b0db9db 197static struct mm_struct *__check_mem_permission(struct task_struct *task)
638fa202 198{
8b0db9db
SW		 199 struct mm_struct *mm;
200
201 mm = get_task_mm(task);
202 if (!mm)
203 return ERR_PTR(-EINVAL);
204
638fa202
RM		 205 /*
206 * A task can always look at itself, in case it chooses
207 * to use system calls instead of load instructions.
208 */
209 if (task == current)
8b0db9db 210 return mm;
638fa202
RM		 211
212 /*
213 * If current is actively ptrace'ing, and would also be
214 * permitted to freshly attach with ptrace now, permit it.
215 */
0d094efe
RM		 216 if (task_is_stopped_or_traced(task)) {
217 int match;
218 rcu_read_lock();
06d98473 219 match = (ptrace_parent(task) == current);
0d094efe
RM		 220 rcu_read_unlock();
221 if (match && ptrace_may_access(task, PTRACE_MODE_ATTACH))
8b0db9db 222 return mm;
0d094efe 223 }
638fa202
RM		 224
225 /*
25985edc 226 * No one else is allowed.
638fa202 227 */
8b0db9db
SW		 228 mmput(mm);
229 return ERR_PTR(-EPERM);
638fa202 230}
1da177e4 231
18f661bc 232/*
8b0db9db
SW		 233 * If current may access user memory in @task return a reference to the
234 * corresponding mm, otherwise ERR_PTR.
18f661bc 235 */
8b0db9db 236static struct mm_struct *check_mem_permission(struct task_struct *task)
18f661bc 237{
8b0db9db 238 struct mm_struct *mm;
18f661bc
SW		 239 int err;
240
241 /*
242 * Avoid racing if task exec's as we might get a new mm but validate
243 * against old credentials.
244 */
245 err = mutex_lock_killable(&task->signal->cred_guard_mutex);
246 if (err)
8b0db9db 247 return ERR_PTR(err);
18f661bc 248
8b0db9db 249 mm = __check_mem_permission(task);
18f661bc
SW		 250 mutex_unlock(&task->signal->cred_guard_mutex);
251
8b0db9db 252 return mm;
638fa202 253}
1da177e4 254
831830b5
AV		 255struct mm_struct *mm_for_maps(struct task_struct *task)
256{
704b836c 257 struct mm_struct *mm;
ec6fd8a4 258 int err;
704b836c 259
ec6fd8a4
AV		 260 err = mutex_lock_killable(&task->signal->cred_guard_mutex);
261 if (err)
262 return ERR_PTR(err);
00f89d21 263
704b836c
ON		 264 mm = get_task_mm(task);
265 if (mm && mm != current->mm &&
266 !ptrace_may_access(task, PTRACE_MODE_READ)) {
267 mmput(mm);
ec6fd8a4 268 mm = ERR_PTR(-EACCES);
13f0feaf 269 }
9b1bf12d 270 mutex_unlock(&task->signal->cred_guard_mutex);
704b836c 271
831830b5 272 return mm;
831830b5
AV		 273}
274
1da177e4
LT		 275static int proc_pid_cmdline(struct task_struct *task, char * buffer)
276{
277 int res = 0;
278 unsigned int len;
279 struct mm_struct *mm = get_task_mm(task);
280 if (!mm)
281 goto out;
282 if (!mm->arg_end)
283 goto out_mm; /* Shh! No looking before we're done */
284
285 len = mm->arg_end - mm->arg_start;
286
287 if (len > PAGE_SIZE)
288 len = PAGE_SIZE;
289
290 res = access_process_vm(task, mm->arg_start, buffer, len, 0);
291
292 // If the nul at the end of args has been overwritten, then
293 // assume application is using setproctitle(3).
294 if (res > 0 && buffer[res-1] != '\0' && len < PAGE_SIZE) {
295 len = strnlen(buffer, res);
296 if (len < res) {
297 res = len;
298 } else {
299 len = mm->env_end - mm->env_start;
300 if (len > PAGE_SIZE - res)
301 len = PAGE_SIZE - res;
302 res += access_process_vm(task, mm->env_start, buffer+res, len, 0);
303 res = strnlen(buffer, res);
304 }
305 }
306out_mm:
307 mmput(mm);
308out:
309 return res;
310}
311
312static int proc_pid_auxv(struct task_struct *task, char *buffer)
313{
2fadaef4
AV		 314 struct mm_struct *mm = mm_for_maps(task);
315 int res = PTR_ERR(mm);
316 if (mm && !IS_ERR(mm)) {
1da177e4 317 unsigned int nwords = 0;
dfe6b7d9 318 do {
1da177e4 319 nwords += 2;
dfe6b7d9 320 } while (mm->saved_auxv[nwords - 2] != 0); /* AT_NULL */
1da177e4
LT		 321 res = nwords * sizeof(mm->saved_auxv[0]);
322 if (res > PAGE_SIZE)
323 res = PAGE_SIZE;
324 memcpy(buffer, mm->saved_auxv, res);
325 mmput(mm);
326 }
327 return res;
328}
329
330
331#ifdef CONFIG_KALLSYMS
332/*
333 * Provides a wchan file via kallsyms in a proper one-value-per-file format.
334 * Returns the resolved symbol. If that fails, simply return the address.
335 */
336static int proc_pid_wchan(struct task_struct *task, char *buffer)
337{
ffb45122 338 unsigned long wchan;
9281acea 339 char symname[KSYM_NAME_LEN];
1da177e4
LT		 340
341 wchan = get_wchan(task);
342
9d65cb4a 343 if (lookup_symbol_name(wchan, symname) < 0)
f83ce3e6
JE		 344 if (!ptrace_may_access(task, PTRACE_MODE_READ))
345 return 0;
346 else
347 return sprintf(buffer, "%lu", wchan);
9d65cb4a
AD		 348 else
349 return sprintf(buffer, "%s", symname);
1da177e4
LT		 350}
351#endif /* CONFIG_KALLSYMS */
352
a9712bc1
AV		 353static int lock_trace(struct task_struct *task)
354{
355 int err = mutex_lock_killable(&task->signal->cred_guard_mutex);
356 if (err)
357 return err;
358 if (!ptrace_may_access(task, PTRACE_MODE_ATTACH)) {
359 mutex_unlock(&task->signal->cred_guard_mutex);
360 return -EPERM;
361 }
362 return 0;
363}
364
365static void unlock_trace(struct task_struct *task)
366{
367 mutex_unlock(&task->signal->cred_guard_mutex);
368}
369
2ec220e2
KC		 370#ifdef CONFIG_STACKTRACE
371
372#define MAX_STACK_TRACE_DEPTH 64
373
374static int proc_pid_stack(struct seq_file *m, struct pid_namespace *ns,
375 struct pid *pid, struct task_struct *task)
376{
377 struct stack_trace trace;
378 unsigned long *entries;
a9712bc1 379 int err;
2ec220e2
KC		 380 int i;
381
382 entries = kmalloc(MAX_STACK_TRACE_DEPTH * sizeof(*entries), GFP_KERNEL);
383 if (!entries)
384 return -ENOMEM;
385
386 trace.nr_entries = 0;
387 trace.max_entries = MAX_STACK_TRACE_DEPTH;
388 trace.entries = entries;
389 trace.skip = 0;
2ec220e2 390
a9712bc1
AV		 391 err = lock_trace(task);
392 if (!err) {
393 save_stack_trace_tsk(task, &trace);
394
395 for (i = 0; i < trace.nr_entries; i++) {
b81a618d 396 seq_printf(m, "[<%pK>] %pS\n",
a9712bc1
AV		 397 (void *)entries[i], (void *)entries[i]);
398 }
399 unlock_trace(task);
2ec220e2
KC		 400 }
401 kfree(entries);
402
a9712bc1 403 return err;
2ec220e2
KC		 404}
405#endif
406
1da177e4
LT		 407#ifdef CONFIG_SCHEDSTATS
408/*
409 * Provides /proc/PID/schedstat
410 */
411static int proc_pid_schedstat(struct task_struct *task, char *buffer)
412{
172ba844 413 return sprintf(buffer, "%llu %llu %lu\n",
826e08b0
IM		 414 (unsigned long long)task->se.sum_exec_runtime,
415 (unsigned long long)task->sched_info.run_delay,
2d72376b 416 task->sched_info.pcount);
1da177e4
LT		 417}
418#endif
419
9745512c
AV		 420#ifdef CONFIG_LATENCYTOP
421static int lstats_show_proc(struct seq_file *m, void *v)
422{
423 int i;
13d77c37
HS		 424 struct inode *inode = m->private;
425 struct task_struct *task = get_proc_task(inode);
9745512c 426
13d77c37
HS		 427 if (!task)
428 return -ESRCH;
429 seq_puts(m, "Latency Top version : v0.1\n");
9745512c 430 for (i = 0; i < 32; i++) {
34e49d4f
JP		 431 struct latency_record *lr = &task->latency_record[i];
432 if (lr->backtrace[0]) {
9745512c 433 int q;
34e49d4f
JP		 434 seq_printf(m, "%i %li %li",
435 lr->count, lr->time, lr->max);
9745512c 436 for (q = 0; q < LT_BACKTRACEDEPTH; q++) {
34e49d4f
JP		 437 unsigned long bt = lr->backtrace[q];
438 if (!bt)
9745512c 439 break;
34e49d4f 440 if (bt == ULONG_MAX)
9745512c 441 break;
34e49d4f 442 seq_printf(m, " %ps", (void *)bt);
9745512c 443 }
9d6de12f 444 seq_putc(m, '\n');
9745512c
AV		 445 }
446
447 }
13d77c37 448 put_task_struct(task);
9745512c
AV		 449 return 0;
450}
451
452static int lstats_open(struct inode *inode, struct file *file)
453{
13d77c37 454 return single_open(file, lstats_show_proc, inode);
d6643d12
HS		 455}
456
9745512c
AV		 457static ssize_t lstats_write(struct file *file, const char __user *buf,
458 size_t count, loff_t *offs)
459{
13d77c37 460 struct task_struct *task = get_proc_task(file->f_dentry->d_inode);
9745512c 461
13d77c37
HS		 462 if (!task)
463 return -ESRCH;
9745512c 464 clear_all_latency_tracing(task);
13d77c37 465 put_task_struct(task);
9745512c
AV		 466
467 return count;
468}
469
470static const struct file_operations proc_lstats_operations = {
471 .open = lstats_open,
472 .read = seq_read,
473 .write = lstats_write,
474 .llseek = seq_lseek,
13d77c37 475 .release = single_release,
9745512c
AV		 476};
477
478#endif
479
1da177e4
LT		 480static int proc_oom_score(struct task_struct *task, char *buffer)
481{
b95c35e7 482 unsigned long points = 0;
1da177e4 483
19c5d45a 484 read_lock(&tasklist_lock);
b95c35e7 485 if (pid_alive(task))
a63d83f4
DR		 486 points = oom_badness(task, NULL, NULL,
487 totalram_pages + total_swap_pages);
19c5d45a 488 read_unlock(&tasklist_lock);
1da177e4
LT		 489 return sprintf(buffer, "%lu\n", points);
490}
491
d85f50d5
NH		 492struct limit_names {
493 char *name;
494 char *unit;
495};
496
497static const struct limit_names lnames[RLIM_NLIMITS] = {
cff4edb5 498 [RLIMIT_CPU] = {"Max cpu time", "seconds"},
d85f50d5
NH		 499 [RLIMIT_FSIZE] = {"Max file size", "bytes"},
500 [RLIMIT_DATA] = {"Max data size", "bytes"},
501 [RLIMIT_STACK] = {"Max stack size", "bytes"},
502 [RLIMIT_CORE] = {"Max core file size", "bytes"},
503 [RLIMIT_RSS] = {"Max resident set", "bytes"},
504 [RLIMIT_NPROC] = {"Max processes", "processes"},
505 [RLIMIT_NOFILE] = {"Max open files", "files"},
506 [RLIMIT_MEMLOCK] = {"Max locked memory", "bytes"},
507 [RLIMIT_AS] = {"Max address space", "bytes"},
508 [RLIMIT_LOCKS] = {"Max file locks", "locks"},
509 [RLIMIT_SIGPENDING] = {"Max pending signals", "signals"},
510 [RLIMIT_MSGQUEUE] = {"Max msgqueue size", "bytes"},
511 [RLIMIT_NICE] = {"Max nice priority", NULL},
512 [RLIMIT_RTPRIO] = {"Max realtime priority", NULL},
8808117c 513 [RLIMIT_RTTIME] = {"Max realtime timeout", "us"},
d85f50d5
NH		 514};
515
516/* Display limits for a process */
517static int proc_pid_limits(struct task_struct *task, char *buffer)
518{
519 unsigned int i;
520 int count = 0;
521 unsigned long flags;
522 char *bufptr = buffer;
523
524 struct rlimit rlim[RLIM_NLIMITS];
525
a6bebbc8 526 if (!lock_task_sighand(task, &flags))
d85f50d5 527 return 0;
d85f50d5
NH		 528 memcpy(rlim, task->signal->rlim, sizeof(struct rlimit) * RLIM_NLIMITS);
529 unlock_task_sighand(task, &flags);
d85f50d5
NH		 530
531 /*
532 * print the file header
533 */
534 count += sprintf(&bufptr[count], "%-25s %-20s %-20s %-10s\n",
535 "Limit", "Soft Limit", "Hard Limit", "Units");
536
537 for (i = 0; i < RLIM_NLIMITS; i++) {
538 if (rlim[i].rlim_cur == RLIM_INFINITY)
539 count += sprintf(&bufptr[count], "%-25s %-20s ",
540 lnames[i].name, "unlimited");
541 else
542 count += sprintf(&bufptr[count], "%-25s %-20lu ",
543 lnames[i].name, rlim[i].rlim_cur);
544
545 if (rlim[i].rlim_max == RLIM_INFINITY)
546 count += sprintf(&bufptr[count], "%-20s ", "unlimited");
547 else
548 count += sprintf(&bufptr[count], "%-20lu ",
549 rlim[i].rlim_max);
550
551 if (lnames[i].unit)
552 count += sprintf(&bufptr[count], "%-10s\n",
553 lnames[i].unit);
554 else
555 count += sprintf(&bufptr[count], "\n");
556 }
557
558 return count;
559}
560
ebcb6734
RM		 561#ifdef CONFIG_HAVE_ARCH_TRACEHOOK
562static int proc_pid_syscall(struct task_struct *task, char *buffer)
563{
564 long nr;
565 unsigned long args[6], sp, pc;
a9712bc1
AV		 566 int res = lock_trace(task);
567 if (res)
568 return res;
ebcb6734
RM		 569
570 if (task_current_syscall(task, &nr, args, 6, &sp, &pc))
a9712bc1
AV		 571 res = sprintf(buffer, "running\n");
572 else if (nr < 0)
573 res = sprintf(buffer, "%ld 0x%lx 0x%lx\n", nr, sp, pc);
574 else
575 res = sprintf(buffer,
ebcb6734
RM		 576 "%ld 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx\n",
577 nr,
578 args[0], args[1], args[2], args[3], args[4], args[5],
579 sp, pc);
a9712bc1
AV		 580 unlock_trace(task);
581 return res;
ebcb6734
RM		 582}
583#endif /* CONFIG_HAVE_ARCH_TRACEHOOK */
584
1da177e4
LT		 585/************************************************************************/
586/* Here the fs part begins */
587/************************************************************************/
588
589/* permission checks */
778c1144 590static int proc_fd_access_allowed(struct inode *inode)
1da177e4 591{
778c1144
EB		 592 struct task_struct *task;
593 int allowed = 0;
df26c40e
EB		 594 /* Allow access to a task's file descriptors if it is us or we
595 * may use ptrace attach to the process and find out that
596 * information.
778c1144
EB		 597 */
598 task = get_proc_task(inode);
df26c40e 599 if (task) {
006ebb40 600 allowed = ptrace_may_access(task, PTRACE_MODE_READ);
778c1144 601 put_task_struct(task);
df26c40e 602 }
778c1144 603 return allowed;
1da177e4
LT		 604}
605
6b4e306a 606int proc_setattr(struct dentry *dentry, struct iattr *attr)
6d76fa58
LT		 607{
608 int error;
609 struct inode *inode = dentry->d_inode;
610
611 if (attr->ia_valid & ATTR_MODE)
612 return -EPERM;
613
614 error = inode_change_ok(inode, attr);
1025774c
CH		 615 if (error)
616 return error;
617
618 if ((attr->ia_valid & ATTR_SIZE) &&
619 attr->ia_size != i_size_read(inode)) {
620 error = vmtruncate(inode, attr->ia_size);
621 if (error)
622 return error;
623 }
624
625 setattr_copy(inode, attr);
626 mark_inode_dirty(inode);
627 return 0;
6d76fa58
LT		 628}
629
c5ef1c42 630static const struct inode_operations proc_def_inode_operations = {
6d76fa58
LT		 631 .setattr = proc_setattr,
632};
633
a1a2c409
MS		 634static int mounts_open_common(struct inode *inode, struct file *file,
635 const struct seq_operations *op)
1da177e4 636{
99f89551 637 struct task_struct *task = get_proc_task(inode);
cf7b708c 638 struct nsproxy *nsp;
6b3286ed 639 struct mnt_namespace *ns = NULL;
a1a2c409 640 struct path root;
5addc5dd
AV		 641 struct proc_mounts *p;
642 int ret = -EINVAL;
1da177e4 643
99f89551 644 if (task) {
cf7b708c
PE		 645 rcu_read_lock();
646 nsp = task_nsproxy(task);
647 if (nsp) {
648 ns = nsp->mnt_ns;
863c4702
AD		 649 if (ns)
650 get_mnt_ns(ns);
651 }
cf7b708c 652 rcu_read_unlock();
f7ad3c6b 653 if (ns && get_task_root(task, &root) == 0)
7c2c7d99 654 ret = 0;
99f89551
EB		 655 put_task_struct(task);
656 }
5addc5dd 657
a1a2c409
MS		 658 if (!ns)
659 goto err;
7c2c7d99 660 if (ret)
a1a2c409
MS		 661 goto err_put_ns;
662
a1a2c409
MS		 663 ret = -ENOMEM;
664 p = kmalloc(sizeof(struct proc_mounts), GFP_KERNEL);
665 if (!p)
666 goto err_put_path;
667
668 file->private_data = &p->m;
669 ret = seq_open(file, op);
670 if (ret)
671 goto err_free;
672
673 p->m.private = p;
674 p->ns = ns;
675 p->root = root;
f1514638 676 p->m.poll_event = ns->event;
a1a2c409
MS		 677
678 return 0;
679
680 err_free:
681 kfree(p);
682 err_put_path:
683 path_put(&root);
684 err_put_ns:
685 put_mnt_ns(ns);
686 err:
1da177e4
LT		 687 return ret;
688}
689
690static int mounts_release(struct inode *inode, struct file *file)
691{
a1a2c409
MS		 692 struct proc_mounts *p = file->private_data;
693 path_put(&p->root);
694 put_mnt_ns(p->ns);
1da177e4
LT		 695 return seq_release(inode, file);
696}
697
5addc5dd
AV		 698static unsigned mounts_poll(struct file *file, poll_table *wait)
699{
700 struct proc_mounts *p = file->private_data;
31b07093 701 unsigned res = POLLIN | POLLRDNORM;
5addc5dd 702
9f5596af
AV		 703 poll_wait(file, &p->ns->poll, wait);
704 if (mnt_had_events(p))
31b07093 705 res |= POLLERR | POLLPRI;
5addc5dd
AV		 706
707 return res;
708}
709
a1a2c409
MS		 710static int mounts_open(struct inode *inode, struct file *file)
711{
712 return mounts_open_common(inode, file, &mounts_op);
713}
714
00977a59 715static const struct file_operations proc_mounts_operations = {
1da177e4
LT		 716 .open = mounts_open,
717 .read = seq_read,
718 .llseek = seq_lseek,
719 .release = mounts_release,
5addc5dd 720 .poll = mounts_poll,
1da177e4
LT		 721};
722
2d4d4864
RP		 723static int mountinfo_open(struct inode *inode, struct file *file)
724{
725 return mounts_open_common(inode, file, &mountinfo_op);
726}
727
728static const struct file_operations proc_mountinfo_operations = {
729 .open = mountinfo_open,
730 .read = seq_read,
731 .llseek = seq_lseek,
732 .release = mounts_release,
733 .poll = mounts_poll,
734};
735
b4629fe2
CL		 736static int mountstats_open(struct inode *inode, struct file *file)
737{
a1a2c409 738 return mounts_open_common(inode, file, &mountstats_op);
b4629fe2
CL		 739}
740
00977a59 741static const struct file_operations proc_mountstats_operations = {
b4629fe2
CL		 742 .open = mountstats_open,
743 .read = seq_read,
744 .llseek = seq_lseek,
745 .release = mounts_release,
746};
747
1da177e4
LT		 748#define PROC_BLOCK_SIZE (3*1024) /* 4K page size but our output routines use some slack for overruns */
749
750static ssize_t proc_info_read(struct file * file, char __user * buf,
751 size_t count, loff_t *ppos)
752{
2fddfeef 753 struct inode * inode = file->f_path.dentry->d_inode;
1da177e4
LT		 754 unsigned long page;
755 ssize_t length;
99f89551
EB		 756 struct task_struct *task = get_proc_task(inode);
757
758 length = -ESRCH;
759 if (!task)
760 goto out_no_task;
1da177e4
LT		 761
762 if (count > PROC_BLOCK_SIZE)
763 count = PROC_BLOCK_SIZE;
99f89551
EB		 764
765 length = -ENOMEM;
e12ba74d 766 if (!(page = __get_free_page(GFP_TEMPORARY)))
99f89551 767 goto out;
1da177e4
LT		 768
769 length = PROC_I(inode)->op.proc_read(task, (char*)page);
770
771 if (length >= 0)
772 length = simple_read_from_buffer(buf, count, ppos, (char *)page, length);
773 free_page(page);
99f89551
EB		 774out:
775 put_task_struct(task);
776out_no_task:
1da177e4
LT		 777 return length;
778}
779
00977a59 780static const struct file_operations proc_info_file_operations = {
1da177e4 781 .read = proc_info_read,
87df8424 782 .llseek = generic_file_llseek,
1da177e4
LT		 783};
784
be614086
EB		 785static int proc_single_show(struct seq_file *m, void *v)
786{
787 struct inode *inode = m->private;
788 struct pid_namespace *ns;
789 struct pid *pid;
790 struct task_struct *task;
791 int ret;
792
793 ns = inode->i_sb->s_fs_info;
794 pid = proc_pid(inode);
795 task = get_pid_task(pid, PIDTYPE_PID);
796 if (!task)
797 return -ESRCH;
798
799 ret = PROC_I(inode)->op.proc_show(m, ns, pid, task);
800
801 put_task_struct(task);
802 return ret;
803}
804
805static int proc_single_open(struct inode *inode, struct file *filp)
806{
c6a34058 807 return single_open(filp, proc_single_show, inode);
be614086
EB		 808}
809
810static const struct file_operations proc_single_file_operations = {
811 .open = proc_single_open,
812 .read = seq_read,
813 .llseek = seq_lseek,
814 .release = single_release,
815};
816
1da177e4
LT		 817static int mem_open(struct inode* inode, struct file* file)
818{
819 file->private_data = (void*)((long)current->self_exec_id);
4a3956c7
KH		 820 /* OK to pass negative loff_t, we can catch out-of-range */
821 file->f_mode |= FMODE_UNSIGNED_OFFSET;
1da177e4
LT		 822 return 0;
823}
824
825static ssize_t mem_read(struct file * file, char __user * buf,
826 size_t count, loff_t *ppos)
827{
2fddfeef 828 struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode);
1da177e4
LT		 829 char *page;
830 unsigned long src = *ppos;
831 int ret = -ESRCH;
832 struct mm_struct *mm;
833
99f89551
EB		 834 if (!task)
835 goto out_no_task;
836
1da177e4 837 ret = -ENOMEM;
e12ba74d 838 page = (char *)__get_free_page(GFP_TEMPORARY);
1da177e4
LT		 839 if (!page)
840 goto out;
841
8b0db9db
SW		 842 mm = check_mem_permission(task);
843 ret = PTR_ERR(mm);
844 if (IS_ERR(mm))
1da177e4
LT		 845 goto out_free;
846
847 ret = -EIO;
848
849 if (file->private_data != (void*)((long)current->self_exec_id))
850 goto out_put;
851
852 ret = 0;
853
854 while (count > 0) {
855 int this_len, retval;
856
857 this_len = (count > PAGE_SIZE) ? PAGE_SIZE : count;
8b0db9db
SW		 858 retval = access_remote_vm(mm, src, page, this_len, 0);
859 if (!retval) {
1da177e4
LT		 860 if (!ret)
861 ret = -EIO;
862 break;
863 }
864
865 if (copy_to_user(buf, page, retval)) {
866 ret = -EFAULT;
867 break;
868 }
869
870 ret += retval;
871 src += retval;
872 buf += retval;
873 count -= retval;
874 }
875 *ppos = src;
876
877out_put:
878 mmput(mm);
879out_free:
880 free_page((unsigned long) page);
881out:
99f89551
EB		 882 put_task_struct(task);
883out_no_task:
1da177e4
LT		 884 return ret;
885}
886
63967fa9 887static ssize_t mem_write(struct file * file, const char __user *buf,
1da177e4
LT		 888 size_t count, loff_t *ppos)
889{
f7ca54f4 890 int copied;
1da177e4 891 char *page;
2fddfeef 892 struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode);
1da177e4 893 unsigned long dst = *ppos;
8b0db9db 894 struct mm_struct *mm;
1da177e4 895
99f89551
EB		 896 copied = -ESRCH;
897 if (!task)
898 goto out_no_task;
899
30cd8903
KM		 900 copied = -ENOMEM;
901 page = (char *)__get_free_page(GFP_TEMPORARY);
902 if (!page)
903 goto out_task;
904
8b0db9db
SW		 905 mm = check_mem_permission(task);
906 copied = PTR_ERR(mm);
907 if (IS_ERR(mm))
30cd8903 908 goto out_free;
1da177e4 909
26947f8c
SW		 910 copied = -EIO;
911 if (file->private_data != (void *)((long)current->self_exec_id))
8b0db9db 912 goto out_mm;
1da177e4 913
f7ca54f4 914 copied = 0;
1da177e4
LT		 915 while (count > 0) {
916 int this_len, retval;
917
918 this_len = (count > PAGE_SIZE) ? PAGE_SIZE : count;
919 if (copy_from_user(page, buf, this_len)) {
920 copied = -EFAULT;
921 break;
922 }
8b0db9db 923 retval = access_remote_vm(mm, dst, page, this_len, 1);
1da177e4
LT		 924 if (!retval) {
925 if (!copied)
926 copied = -EIO;
927 break;
928 }
929 copied += retval;
930 buf += retval;
931 dst += retval;
932 count -= retval;
933 }
934 *ppos = dst;
30cd8903 935
8b0db9db
SW		 936out_mm:
937 mmput(mm);
30cd8903
KM		 938out_free:
939 free_page((unsigned long) page);
8b0db9db 940out_task:
99f89551
EB		 941 put_task_struct(task);
942out_no_task:
1da177e4
LT		 943 return copied;
944}
1da177e4 945
85863e47 946loff_t mem_lseek(struct file *file, loff_t offset, int orig)
1da177e4
LT		 947{
948 switch (orig) {
949 case 0:
950 file->f_pos = offset;
951 break;
952 case 1:
953 file->f_pos += offset;
954 break;
955 default:
956 return -EINVAL;
957 }
958 force_successful_syscall_return();
959 return file->f_pos;
960}
961
00977a59 962static const struct file_operations proc_mem_operations = {
1da177e4
LT		 963 .llseek = mem_lseek,
964 .read = mem_read,
965 .write = mem_write,
966 .open = mem_open,
967};
968
315e28c8
JP		 969static ssize_t environ_read(struct file *file, char __user *buf,
970 size_t count, loff_t *ppos)
971{
972 struct task_struct *task = get_proc_task(file->f_dentry->d_inode);
973 char *page;
974 unsigned long src = *ppos;
975 int ret = -ESRCH;
976 struct mm_struct *mm;
977
978 if (!task)
979 goto out_no_task;
980
315e28c8
JP		 981 ret = -ENOMEM;
982 page = (char *)__get_free_page(GFP_TEMPORARY);
983 if (!page)
984 goto out;
985
315e28c8 986
d6f64b89
AV		 987 mm = mm_for_maps(task);
988 ret = PTR_ERR(mm);
989 if (!mm || IS_ERR(mm))
315e28c8
JP		 990 goto out_free;
991
d6f64b89 992 ret = 0;
315e28c8
JP		 993 while (count > 0) {
994 int this_len, retval, max_len;
995
996 this_len = mm->env_end - (mm->env_start + src);
997
998 if (this_len <= 0)
999 break;
1000
1001 max_len = (count > PAGE_SIZE) ? PAGE_SIZE : count;
1002 this_len = (this_len > max_len) ? max_len : this_len;
1003
1004 retval = access_process_vm(task, (mm->env_start + src),
1005 page, this_len, 0);
1006
1007 if (retval <= 0) {
1008 ret = retval;
1009 break;
1010 }
1011
1012 if (copy_to_user(buf, page, retval)) {
1013 ret = -EFAULT;
1014 break;
1015 }
1016
1017 ret += retval;
1018 src += retval;
1019 buf += retval;
1020 count -= retval;
1021 }
1022 *ppos = src;
1023
1024 mmput(mm);
1025out_free:
1026 free_page((unsigned long) page);
1027out:
1028 put_task_struct(task);
1029out_no_task:
1030 return ret;
1031}
1032
1033static const struct file_operations proc_environ_operations = {
1034 .read = environ_read,
87df8424 1035 .llseek = generic_file_llseek,
315e28c8
JP		 1036};
1037
1da177e4
LT		 1038static ssize_t oom_adjust_read(struct file *file, char __user *buf,
1039 size_t count, loff_t *ppos)
1040{
2fddfeef 1041 struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode);
8578cea7 1042 char buffer[PROC_NUMBUF];
1da177e4 1043 size_t len;
28b83c51
KM		 1044 int oom_adjust = OOM_DISABLE;
1045 unsigned long flags;
1da177e4 1046
99f89551
EB		 1047 if (!task)
1048 return -ESRCH;
28b83c51
KM		 1049
1050 if (lock_task_sighand(task, &flags)) {
1051 oom_adjust = task->signal->oom_adj;
1052 unlock_task_sighand(task, &flags);
1053 }
1054
99f89551
EB		 1055 put_task_struct(task);
1056
8578cea7 1057 len = snprintf(buffer, sizeof(buffer), "%i\n", oom_adjust);
0c28f287
AM		 1058
1059 return simple_read_from_buffer(buf, count, ppos, buffer, len);
1da177e4
LT		 1060}
1061
1062static ssize_t oom_adjust_write(struct file *file, const char __user *buf,
1063 size_t count, loff_t *ppos)
1064{
99f89551 1065 struct task_struct *task;
5d863b89 1066 char buffer[PROC_NUMBUF];
0a8cb8e3 1067 int oom_adjust;
28b83c51 1068 unsigned long flags;
5d863b89 1069 int err;
1da177e4 1070
8578cea7
EB		 1071 memset(buffer, 0, sizeof(buffer));
1072 if (count > sizeof(buffer) - 1)
1073 count = sizeof(buffer) - 1;
723548bf
DR		 1074 if (copy_from_user(buffer, buf, count)) {
1075 err = -EFAULT;
1076 goto out;
1077 }
5d863b89 1078
0a8cb8e3 1079 err = kstrtoint(strstrip(buffer), 0, &oom_adjust);
5d863b89 1080 if (err)
723548bf 1081 goto out;
8ac773b4 1082 if ((oom_adjust < OOM_ADJUST_MIN || oom_adjust > OOM_ADJUST_MAX) &&
723548bf
DR		 1083 oom_adjust != OOM_DISABLE) {
1084 err = -EINVAL;
1085 goto out;
1086 }
5d863b89 1087
2fddfeef 1088 task = get_proc_task(file->f_path.dentry->d_inode);
723548bf
DR		 1089 if (!task) {
1090 err = -ESRCH;
1091 goto out;
1092 }
d19d5476
DR		 1093
1094 task_lock(task);
1095 if (!task->mm) {
1096 err = -EINVAL;
1097 goto err_task_lock;
1098 }
1099
28b83c51 1100 if (!lock_task_sighand(task, &flags)) {
723548bf 1101 err = -ESRCH;
d19d5476 1102 goto err_task_lock;
28b83c51
KM		 1103 }
1104
1105 if (oom_adjust < task->signal->oom_adj && !capable(CAP_SYS_RESOURCE)) {
723548bf
DR		 1106 err = -EACCES;
1107 goto err_sighand;
8fb4fc68 1108 }
28b83c51 1109
3d5992d2
YH		 1110 if (oom_adjust != task->signal->oom_adj) {
1111 if (oom_adjust == OOM_DISABLE)
1112 atomic_inc(&task->mm->oom_disable_count);
1113 if (task->signal->oom_adj == OOM_DISABLE)
1114 atomic_dec(&task->mm->oom_disable_count);
1115 }
1116
51b1bd2a
DR		 1117 /*
1118 * Warn that /proc/pid/oom_adj is deprecated, see
1119 * Documentation/feature-removal-schedule.txt.
1120 */
c2142704 1121 printk_once(KERN_WARNING "%s (%d): /proc/%d/oom_adj is deprecated, please use /proc/%d/oom_score_adj instead.\n",
be8f684d
DR		 1122 current->comm, task_pid_nr(current), task_pid_nr(task),
1123 task_pid_nr(task));
28b83c51 1124 task->signal->oom_adj = oom_adjust;
a63d83f4
DR		 1125 /*
1126 * Scale /proc/pid/oom_score_adj appropriately ensuring that a maximum
1127 * value is always attainable.
1128 */
1129 if (task->signal->oom_adj == OOM_ADJUST_MAX)
1130 task->signal->oom_score_adj = OOM_SCORE_ADJ_MAX;
1131 else
1132 task->signal->oom_score_adj = (oom_adjust * OOM_SCORE_ADJ_MAX) /
1133 -OOM_DISABLE;
723548bf 1134err_sighand:
28b83c51 1135 unlock_task_sighand(task, &flags);
d19d5476
DR		 1136err_task_lock:
1137 task_unlock(task);
99f89551 1138 put_task_struct(task);
723548bf
DR		 1139out:
1140 return err < 0 ? err : count;
1da177e4
LT		 1141}
1142
00977a59 1143static const struct file_operations proc_oom_adjust_operations = {
1da177e4
LT		 1144 .read = oom_adjust_read,
1145 .write = oom_adjust_write,
87df8424 1146 .llseek = generic_file_llseek,
1da177e4
LT		 1147};
1148
a63d83f4
DR		 1149static ssize_t oom_score_adj_read(struct file *file, char __user *buf,
1150 size_t count, loff_t *ppos)
1151{
1152 struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode);
1153 char buffer[PROC_NUMBUF];
1154 int oom_score_adj = OOM_SCORE_ADJ_MIN;
1155 unsigned long flags;
1156 size_t len;
1157
1158 if (!task)
1159 return -ESRCH;
1160 if (lock_task_sighand(task, &flags)) {
1161 oom_score_adj = task->signal->oom_score_adj;
1162 unlock_task_sighand(task, &flags);
1163 }
1164 put_task_struct(task);
1165 len = snprintf(buffer, sizeof(buffer), "%d\n", oom_score_adj);
1166 return simple_read_from_buffer(buf, count, ppos, buffer, len);
1167}
1168
1169static ssize_t oom_score_adj_write(struct file *file, const char __user *buf,
1170 size_t count, loff_t *ppos)
1171{
1172 struct task_struct *task;
1173 char buffer[PROC_NUMBUF];
1174 unsigned long flags;
0a8cb8e3 1175 int oom_score_adj;
a63d83f4
DR		 1176 int err;
1177
1178 memset(buffer, 0, sizeof(buffer));
1179 if (count > sizeof(buffer) - 1)
1180 count = sizeof(buffer) - 1;
723548bf
DR		 1181 if (copy_from_user(buffer, buf, count)) {
1182 err = -EFAULT;
1183 goto out;
1184 }
a63d83f4 1185
0a8cb8e3 1186 err = kstrtoint(strstrip(buffer), 0, &oom_score_adj);
a63d83f4 1187 if (err)
723548bf 1188 goto out;
a63d83f4 1189 if (oom_score_adj < OOM_SCORE_ADJ_MIN ||
723548bf
DR		 1190 oom_score_adj > OOM_SCORE_ADJ_MAX) {
1191 err = -EINVAL;
1192 goto out;
1193 }
a63d83f4
DR		 1194
1195 task = get_proc_task(file->f_path.dentry->d_inode);
723548bf
DR		 1196 if (!task) {
1197 err = -ESRCH;
1198 goto out;
1199 }
d19d5476
DR		 1200
1201 task_lock(task);
1202 if (!task->mm) {
1203 err = -EINVAL;
1204 goto err_task_lock;
1205 }
1206
a63d83f4 1207 if (!lock_task_sighand(task, &flags)) {
723548bf 1208 err = -ESRCH;
d19d5476 1209 goto err_task_lock;
a63d83f4 1210 }
d19d5476 1211
dabb16f6 1212 if (oom_score_adj < task->signal->oom_score_adj_min &&
a63d83f4 1213 !capable(CAP_SYS_RESOURCE)) {
723548bf
DR		 1214 err = -EACCES;
1215 goto err_sighand;
a63d83f4
DR		 1216 }
1217
3d5992d2
YH		 1218 if (oom_score_adj != task->signal->oom_score_adj) {
1219 if (oom_score_adj == OOM_SCORE_ADJ_MIN)
1220 atomic_inc(&task->mm->oom_disable_count);
1221 if (task->signal->oom_score_adj == OOM_SCORE_ADJ_MIN)
1222 atomic_dec(&task->mm->oom_disable_count);
1223 }
a63d83f4 1224 task->signal->oom_score_adj = oom_score_adj;
dabb16f6
MSB		 1225 if (has_capability_noaudit(current, CAP_SYS_RESOURCE))
1226 task->signal->oom_score_adj_min = oom_score_adj;
a63d83f4
DR		 1227 /*
1228 * Scale /proc/pid/oom_adj appropriately ensuring that OOM_DISABLE is
1229 * always attainable.
1230 */
1231 if (task->signal->oom_score_adj == OOM_SCORE_ADJ_MIN)
1232 task->signal->oom_adj = OOM_DISABLE;
1233 else
1234 task->signal->oom_adj = (oom_score_adj * OOM_ADJUST_MAX) /
1235 OOM_SCORE_ADJ_MAX;
723548bf 1236err_sighand:
a63d83f4 1237 unlock_task_sighand(task, &flags);
d19d5476
DR		 1238err_task_lock:
1239 task_unlock(task);
a63d83f4 1240 put_task_struct(task);
723548bf
DR		 1241out:
1242 return err < 0 ? err : count;
a63d83f4
DR		 1243}
1244
1245static const struct file_operations proc_oom_score_adj_operations = {
1246 .read = oom_score_adj_read,
1247 .write = oom_score_adj_write,
6038f373 1248 .llseek = default_llseek,
a63d83f4
DR		 1249};
1250
1da177e4
LT		 1251#ifdef CONFIG_AUDITSYSCALL
1252#define TMPBUFLEN 21
1253static ssize_t proc_loginuid_read(struct file * file, char __user * buf,
1254 size_t count, loff_t *ppos)
1255{
2fddfeef 1256 struct inode * inode = file->f_path.dentry->d_inode;
99f89551 1257 struct task_struct *task = get_proc_task(inode);
1da177e4
LT		 1258 ssize_t length;
1259 char tmpbuf[TMPBUFLEN];
1260
99f89551
EB		 1261 if (!task)
1262 return -ESRCH;
1da177e4 1263 length = scnprintf(tmpbuf, TMPBUFLEN, "%u",
0c11b942 1264 audit_get_loginuid(task));
99f89551 1265 put_task_struct(task);
1da177e4
LT		 1266 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1267}
1268
1269static ssize_t proc_loginuid_write(struct file * file, const char __user * buf,
1270 size_t count, loff_t *ppos)
1271{
2fddfeef 1272 struct inode * inode = file->f_path.dentry->d_inode;
1da177e4
LT		 1273 char *page, *tmp;
1274 ssize_t length;
1da177e4
LT		 1275 uid_t loginuid;
1276
1277 if (!capable(CAP_AUDIT_CONTROL))
1278 return -EPERM;
1279
7dc52157
PM		 1280 rcu_read_lock();
1281 if (current != pid_task(proc_pid(inode), PIDTYPE_PID)) {
1282 rcu_read_unlock();
1da177e4 1283 return -EPERM;
7dc52157
PM		 1284 }
1285 rcu_read_unlock();
1da177e4 1286
e0182909
AV		 1287 if (count >= PAGE_SIZE)
1288 count = PAGE_SIZE - 1;
1da177e4
LT		 1289
1290 if (*ppos != 0) {
1291 /* No partial writes. */
1292 return -EINVAL;
1293 }
e12ba74d 1294 page = (char*)__get_free_page(GFP_TEMPORARY);
1da177e4
LT		 1295 if (!page)
1296 return -ENOMEM;
1297 length = -EFAULT;
1298 if (copy_from_user(page, buf, count))
1299 goto out_free_page;
1300
e0182909 1301 page[count] = '\0';
1da177e4
LT		 1302 loginuid = simple_strtoul(page, &tmp, 10);
1303 if (tmp == page) {
1304 length = -EINVAL;
1305 goto out_free_page;
1306
1307 }
99f89551 1308 length = audit_set_loginuid(current, loginuid);
1da177e4
LT		 1309 if (likely(length == 0))
1310 length = count;
1311
1312out_free_page:
1313 free_page((unsigned long) page);
1314 return length;
1315}
1316
00977a59 1317static const struct file_operations proc_loginuid_operations = {
1da177e4
LT		 1318 .read = proc_loginuid_read,
1319 .write = proc_loginuid_write,
87df8424 1320 .llseek = generic_file_llseek,
1da177e4 1321};
1e0bd755
EP		 1322
1323static ssize_t proc_sessionid_read(struct file * file, char __user * buf,
1324 size_t count, loff_t *ppos)
1325{
1326 struct inode * inode = file->f_path.dentry->d_inode;
1327 struct task_struct *task = get_proc_task(inode);
1328 ssize_t length;
1329 char tmpbuf[TMPBUFLEN];
1330
1331 if (!task)
1332 return -ESRCH;
1333 length = scnprintf(tmpbuf, TMPBUFLEN, "%u",
1334 audit_get_sessionid(task));
1335 put_task_struct(task);
1336 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1337}
1338
1339static const struct file_operations proc_sessionid_operations = {
1340 .read = proc_sessionid_read,
87df8424 1341 .llseek = generic_file_llseek,
1e0bd755 1342};
1da177e4
LT		 1343#endif
1344
f4f154fd
AM		 1345#ifdef CONFIG_FAULT_INJECTION
1346static ssize_t proc_fault_inject_read(struct file * file, char __user * buf,
1347 size_t count, loff_t *ppos)
1348{
1349 struct task_struct *task = get_proc_task(file->f_dentry->d_inode);
1350 char buffer[PROC_NUMBUF];
1351 size_t len;
1352 int make_it_fail;
f4f154fd
AM		 1353
1354 if (!task)
1355 return -ESRCH;
1356 make_it_fail = task->make_it_fail;
1357 put_task_struct(task);
1358
1359 len = snprintf(buffer, sizeof(buffer), "%i\n", make_it_fail);
0c28f287
AM		 1360
1361 return simple_read_from_buffer(buf, count, ppos, buffer, len);
f4f154fd
AM		 1362}
1363
1364static ssize_t proc_fault_inject_write(struct file * file,
1365 const char __user * buf, size_t count, loff_t *ppos)
1366{
1367 struct task_struct *task;
1368 char buffer[PROC_NUMBUF], *end;
1369 int make_it_fail;
1370
1371 if (!capable(CAP_SYS_RESOURCE))
1372 return -EPERM;
1373 memset(buffer, 0, sizeof(buffer));
1374 if (count > sizeof(buffer) - 1)
1375 count = sizeof(buffer) - 1;
1376 if (copy_from_user(buffer, buf, count))
1377 return -EFAULT;
cba8aafe
VL		 1378 make_it_fail = simple_strtol(strstrip(buffer), &end, 0);
1379 if (*end)
1380 return -EINVAL;
f4f154fd
AM		 1381 task = get_proc_task(file->f_dentry->d_inode);
1382 if (!task)
1383 return -ESRCH;
1384 task->make_it_fail = make_it_fail;
1385 put_task_struct(task);
cba8aafe
VL		 1386
1387 return count;
f4f154fd
AM		 1388}
1389
00977a59 1390static const struct file_operations proc_fault_inject_operations = {
f4f154fd
AM		 1391 .read = proc_fault_inject_read,
1392 .write = proc_fault_inject_write,
87df8424 1393 .llseek = generic_file_llseek,
f4f154fd
AM		 1394};
1395#endif
1396
9745512c 1397
43ae34cb
IM		 1398#ifdef CONFIG_SCHED_DEBUG
1399/*
1400 * Print out various scheduling related per-task fields:
1401 */
1402static int sched_show(struct seq_file *m, void *v)
1403{
1404 struct inode *inode = m->private;
1405 struct task_struct *p;
1406
43ae34cb
IM		 1407 p = get_proc_task(inode);
1408 if (!p)
1409 return -ESRCH;
1410 proc_sched_show_task(p, m);
1411
1412 put_task_struct(p);
1413
1414 return 0;
1415}
1416
1417static ssize_t
1418sched_write(struct file *file, const char __user *buf,
1419 size_t count, loff_t *offset)
1420{
1421 struct inode *inode = file->f_path.dentry->d_inode;
1422 struct task_struct *p;
1423
43ae34cb
IM		 1424 p = get_proc_task(inode);
1425 if (!p)
1426 return -ESRCH;
1427 proc_sched_set_task(p);
1428
1429 put_task_struct(p);
1430
1431 return count;
1432}
1433
1434static int sched_open(struct inode *inode, struct file *filp)
1435{
c6a34058 1436 return single_open(filp, sched_show, inode);
43ae34cb
IM		 1437}
1438
1439static const struct file_operations proc_pid_sched_operations = {
1440 .open = sched_open,
1441 .read = seq_read,
1442 .write = sched_write,
1443 .llseek = seq_lseek,
5ea473a1 1444 .release = single_release,
43ae34cb
IM		 1445};
1446
1447#endif
1448
5091faa4
MG		 1449#ifdef CONFIG_SCHED_AUTOGROUP
1450/*
1451 * Print out autogroup related information:
1452 */
1453static int sched_autogroup_show(struct seq_file *m, void *v)
1454{
1455 struct inode *inode = m->private;
1456 struct task_struct *p;
1457
1458 p = get_proc_task(inode);
1459 if (!p)
1460 return -ESRCH;
1461 proc_sched_autogroup_show_task(p, m);
1462
1463 put_task_struct(p);
1464
1465 return 0;
1466}
1467
1468static ssize_t
1469sched_autogroup_write(struct file *file, const char __user *buf,
1470 size_t count, loff_t *offset)
1471{
1472 struct inode *inode = file->f_path.dentry->d_inode;
1473 struct task_struct *p;
1474 char buffer[PROC_NUMBUF];
0a8cb8e3 1475 int nice;
5091faa4
MG		 1476 int err;
1477
1478 memset(buffer, 0, sizeof(buffer));
1479 if (count > sizeof(buffer) - 1)
1480 count = sizeof(buffer) - 1;
1481 if (copy_from_user(buffer, buf, count))
1482 return -EFAULT;
1483
0a8cb8e3
AD		 1484 err = kstrtoint(strstrip(buffer), 0, &nice);
1485 if (err < 0)
1486 return err;
5091faa4
MG		 1487
1488 p = get_proc_task(inode);
1489 if (!p)
1490 return -ESRCH;
1491
1492 err = nice;
1493 err = proc_sched_autogroup_set_nice(p, &err);
1494 if (err)
1495 count = err;
1496
1497 put_task_struct(p);
1498
1499 return count;
1500}
1501
1502static int sched_autogroup_open(struct inode *inode, struct file *filp)
1503{
1504 int ret;
1505
1506 ret = single_open(filp, sched_autogroup_show, NULL);
1507 if (!ret) {
1508 struct seq_file *m = filp->private_data;
1509
1510 m->private = inode;
1511 }
1512 return ret;
1513}
1514
1515static const struct file_operations proc_pid_sched_autogroup_operations = {
1516 .open = sched_autogroup_open,
1517 .read = seq_read,
1518 .write = sched_autogroup_write,
1519 .llseek = seq_lseek,
1520 .release = single_release,
1521};
1522
1523#endif /* CONFIG_SCHED_AUTOGROUP */
1524
4614a696 1525static ssize_t comm_write(struct file *file, const char __user *buf,
1526 size_t count, loff_t *offset)
1527{
1528 struct inode *inode = file->f_path.dentry->d_inode;
1529 struct task_struct *p;
1530 char buffer[TASK_COMM_LEN];
1531
1532 memset(buffer, 0, sizeof(buffer));
1533 if (count > sizeof(buffer) - 1)
1534 count = sizeof(buffer) - 1;
1535 if (copy_from_user(buffer, buf, count))
1536 return -EFAULT;
1537
1538 p = get_proc_task(inode);
1539 if (!p)
1540 return -ESRCH;
1541
1542 if (same_thread_group(current, p))
1543 set_task_comm(p, buffer);
1544 else
1545 count = -EINVAL;
1546
1547 put_task_struct(p);
1548
1549 return count;
1550}
1551
1552static int comm_show(struct seq_file *m, void *v)
1553{
1554 struct inode *inode = m->private;
1555 struct task_struct *p;
1556
1557 p = get_proc_task(inode);
1558 if (!p)
1559 return -ESRCH;
1560
1561 task_lock(p);
1562 seq_printf(m, "%s\n", p->comm);
1563 task_unlock(p);
1564
1565 put_task_struct(p);
1566
1567 return 0;
1568}
1569
1570static int comm_open(struct inode *inode, struct file *filp)
1571{
c6a34058 1572 return single_open(filp, comm_show, inode);
4614a696 1573}
1574
1575static const struct file_operations proc_pid_set_comm_operations = {
1576 .open = comm_open,
1577 .read = seq_read,
1578 .write = comm_write,
1579 .llseek = seq_lseek,
1580 .release = single_release,
1581};
1582
925d1c40
MH		 1583static int proc_exe_link(struct inode *inode, struct path *exe_path)
1584{
1585 struct task_struct *task;
1586 struct mm_struct *mm;
1587 struct file *exe_file;
1588
1589 task = get_proc_task(inode);
1590 if (!task)
1591 return -ENOENT;
1592 mm = get_task_mm(task);
1593 put_task_struct(task);
1594 if (!mm)
1595 return -ENOENT;
1596 exe_file = get_mm_exe_file(mm);
1597 mmput(mm);
1598 if (exe_file) {
1599 *exe_path = exe_file->f_path;
1600 path_get(&exe_file->f_path);
1601 fput(exe_file);
1602 return 0;
1603 } else
1604 return -ENOENT;
1605}
1606
008b150a 1607static void *proc_pid_follow_link(struct dentry *dentry, struct nameidata *nd)
1da177e4
LT		 1608{
1609 struct inode *inode = dentry->d_inode;
1610 int error = -EACCES;
1611
1612 /* We don't need a base pointer in the /proc filesystem */
1d957f9b 1613 path_put(&nd->path);
1da177e4 1614
778c1144
EB		 1615 /* Are we allowed to snoop on the tasks file descriptors? */
1616 if (!proc_fd_access_allowed(inode))
1da177e4 1617 goto out;
1da177e4 1618
3dcd25f3 1619 error = PROC_I(inode)->op.proc_get_link(inode, &nd->path);
1da177e4 1620out:
008b150a 1621 return ERR_PTR(error);
1da177e4
LT		 1622}
1623
3dcd25f3 1624static int do_proc_readlink(struct path *path, char __user *buffer, int buflen)
1da177e4 1625{
e12ba74d 1626 char *tmp = (char*)__get_free_page(GFP_TEMPORARY);
3dcd25f3 1627 char *pathname;
1da177e4
LT		 1628 int len;
1629
1630 if (!tmp)
1631 return -ENOMEM;
0c28f287 1632
7b2a69ba 1633 pathname = d_path(path, tmp, PAGE_SIZE);
3dcd25f3
JB		 1634 len = PTR_ERR(pathname);
1635 if (IS_ERR(pathname))
1da177e4 1636 goto out;
3dcd25f3 1637 len = tmp + PAGE_SIZE - 1 - pathname;
1da177e4
LT		 1638
1639 if (len > buflen)
1640 len = buflen;
3dcd25f3 1641 if (copy_to_user(buffer, pathname, len))
1da177e4
LT		 1642 len = -EFAULT;
1643 out:
1644 free_page((unsigned long)tmp);
1645 return len;
1646}
1647
1648static int proc_pid_readlink(struct dentry * dentry, char __user * buffer, int buflen)
1649{
1650 int error = -EACCES;
1651 struct inode *inode = dentry->d_inode;
3dcd25f3 1652 struct path path;
1da177e4 1653
778c1144
EB		 1654 /* Are we allowed to snoop on the tasks file descriptors? */
1655 if (!proc_fd_access_allowed(inode))
1da177e4 1656 goto out;
1da177e4 1657
3dcd25f3 1658 error = PROC_I(inode)->op.proc_get_link(inode, &path);
1da177e4
LT		 1659 if (error)
1660 goto out;
1661
3dcd25f3
JB		 1662 error = do_proc_readlink(&path, buffer, buflen);
1663 path_put(&path);
1da177e4 1664out:
1da177e4
LT		 1665 return error;
1666}
1667
c5ef1c42 1668static const struct inode_operations proc_pid_link_inode_operations = {
1da177e4 1669 .readlink = proc_pid_readlink,
6d76fa58
LT		 1670 .follow_link = proc_pid_follow_link,
1671 .setattr = proc_setattr,
1da177e4
LT		 1672};
1673
28a6d671
EB		 1674
1675/* building an inode */
1676
1677static int task_dumpable(struct task_struct *task)
1da177e4 1678{
28a6d671
EB		 1679 int dumpable = 0;
1680 struct mm_struct *mm;
1da177e4 1681
28a6d671
EB		 1682 task_lock(task);
1683 mm = task->mm;
1684 if (mm)
6c5d5238 1685 dumpable = get_dumpable(mm);
28a6d671
EB		 1686 task_unlock(task);
1687 if(dumpable == 1)
1688 return 1;
1689 return 0;
1690}
1da177e4 1691
6b4e306a 1692struct inode *proc_pid_make_inode(struct super_block * sb, struct task_struct *task)
28a6d671
EB		 1693{
1694 struct inode * inode;
1695 struct proc_inode *ei;
c69e8d9c 1696 const struct cred *cred;
1da177e4 1697
28a6d671 1698 /* We need a new inode */
1da177e4 1699
28a6d671
EB		 1700 inode = new_inode(sb);
1701 if (!inode)
1702 goto out;
1703
1704 /* Common stuff */
1705 ei = PROC_I(inode);
85fe4025 1706 inode->i_ino = get_next_ino();
28a6d671 1707 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
28a6d671
EB		 1708 inode->i_op = &proc_def_inode_operations;
1709
1710 /*
1711 * grab the reference to task.
1712 */
1a657f78 1713 ei->pid = get_task_pid(task, PIDTYPE_PID);
28a6d671
EB		 1714 if (!ei->pid)
1715 goto out_unlock;
1716
28a6d671 1717 if (task_dumpable(task)) {
c69e8d9c
DH		 1718 rcu_read_lock();
1719 cred = __task_cred(task);
1720 inode->i_uid = cred->euid;
1721 inode->i_gid = cred->egid;
1722 rcu_read_unlock();
1da177e4 1723 }
28a6d671
EB		 1724 security_task_to_inode(task, inode);
1725
1da177e4 1726out:
28a6d671
EB		 1727 return inode;
1728
1729out_unlock:
1730 iput(inode);
1731 return NULL;
1da177e4
LT		 1732}
1733
6b4e306a 1734int pid_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
1da177e4 1735{
1da177e4 1736 struct inode *inode = dentry->d_inode;
28a6d671 1737 struct task_struct *task;
c69e8d9c
DH		 1738 const struct cred *cred;
1739
28a6d671 1740 generic_fillattr(inode, stat);
1da177e4 1741
28a6d671
EB		 1742 rcu_read_lock();
1743 stat->uid = 0;
1744 stat->gid = 0;
1745 task = pid_task(proc_pid(inode), PIDTYPE_PID);
1746 if (task) {
1747 if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) ||
1748 task_dumpable(task)) {
c69e8d9c
DH		 1749 cred = __task_cred(task);
1750 stat->uid = cred->euid;
1751 stat->gid = cred->egid;
1da177e4
LT		 1752 }
1753 }
28a6d671 1754 rcu_read_unlock();
d6e71144 1755 return 0;
1da177e4
LT		 1756}
1757
1da177e4
LT		 1758/* dentry stuff */
1759
1760/*
1761 * Exceptional case: normally we are not allowed to unhash a busy
1762 * directory. In this case, however, we can do it - no aliasing problems
1763 * due to the way we treat inodes.
1764 *
1765 * Rewrite the inode's ownerships here because the owning task may have
1766 * performed a setuid(), etc.
99f89551
EB		 1767 *
1768 * Before the /proc/pid/status file was created the only way to read
1769 * the effective uid of a /process was to stat /proc/pid. Reading
1770 * /proc/pid/status is slow enough that procps and other packages
1771 * kept stating /proc/pid. To keep the rules in /proc simple I have
1772 * made this apply to all per process world readable and executable
1773 * directories.
1da177e4 1774 */
6b4e306a 1775int pid_revalidate(struct dentry *dentry, struct nameidata *nd)
1da177e4 1776{
34286d66
NP		 1777 struct inode *inode;
1778 struct task_struct *task;
c69e8d9c
DH		 1779 const struct cred *cred;
1780
34286d66
NP		 1781 if (nd && nd->flags & LOOKUP_RCU)
1782 return -ECHILD;
1783
1784 inode = dentry->d_inode;
1785 task = get_proc_task(inode);
1786
99f89551
EB		 1787 if (task) {
1788 if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) ||
1789 task_dumpable(task)) {
c69e8d9c
DH		 1790 rcu_read_lock();
1791 cred = __task_cred(task);
1792 inode->i_uid = cred->euid;
1793 inode->i_gid = cred->egid;
1794 rcu_read_unlock();
1da177e4
LT		 1795 } else {
1796 inode->i_uid = 0;
1797 inode->i_gid = 0;
1798 }
9ee8ab9f 1799 inode->i_mode &= ~(S_ISUID | S_ISGID);
1da177e4 1800 security_task_to_inode(task, inode);
99f89551 1801 put_task_struct(task);
1da177e4
LT		 1802 return 1;
1803 }
1804 d_drop(dentry);
1805 return 0;
1806}
1807
fe15ce44 1808static int pid_delete_dentry(const struct dentry * dentry)
99f89551 1809{
28a6d671
EB		 1810 /* Is the task we represent dead?
1811 * If so, then don't put the dentry on the lru list,
1812 * kill it immediately.
1813 */
1814 return !proc_pid(dentry->d_inode)->tasks[PIDTYPE_PID].first;
1815}
1816
6b4e306a 1817const struct dentry_operations pid_dentry_operations =
28a6d671
EB		 1818{
1819 .d_revalidate = pid_revalidate,
1820 .d_delete = pid_delete_dentry,
1821};
1822
1823/* Lookups */
1824
1c0d04c9
EB		 1825/*
1826 * Fill a directory entry.
1827 *
1828 * If possible create the dcache entry and derive our inode number and
1829 * file type from dcache entry.
1830 *
1831 * Since all of the proc inode numbers are dynamically generated, the inode
1832 * numbers do not exist until the inode is cache. This means creating the
1833 * the dcache entry in readdir is necessary to keep the inode numbers
1834 * reported by readdir in sync with the inode numbers reported
1835 * by stat.
1836 */
6b4e306a
EB		 1837int proc_fill_cache(struct file *filp, void *dirent, filldir_t filldir,
1838 const char *name, int len,
c5141e6d 1839 instantiate_t instantiate, struct task_struct *task, const void *ptr)
61a28784 1840{
2fddfeef 1841 struct dentry *child, *dir = filp->f_path.dentry;
61a28784
EB		 1842 struct inode *inode;
1843 struct qstr qname;
1844 ino_t ino = 0;
1845 unsigned type = DT_UNKNOWN;
1846
1847 qname.name = name;
1848 qname.len = len;
1849 qname.hash = full_name_hash(name, len);
1850
1851 child = d_lookup(dir, &qname);
1852 if (!child) {
1853 struct dentry *new;
1854 new = d_alloc(dir, &qname);
1855 if (new) {
1856 child = instantiate(dir->d_inode, new, task, ptr);
1857 if (child)
1858 dput(new);
1859 else
1860 child = new;
1861 }
1862 }
1863 if (!child || IS_ERR(child) || !child->d_inode)
1864 goto end_instantiate;
1865 inode = child->d_inode;
1866 if (inode) {
1867 ino = inode->i_ino;
1868 type = inode->i_mode >> 12;
1869 }
1870 dput(child);
1871end_instantiate:
1872 if (!ino)
1873 ino = find_inode_number(dir, &qname);
1874 if (!ino)
1875 ino = 1;
1876 return filldir(dirent, name, len, filp->f_pos, ino, type);
1877}
1878
28a6d671
EB		 1879static unsigned name_to_int(struct dentry *dentry)
1880{
1881 const char *name = dentry->d_name.name;
1882 int len = dentry->d_name.len;
1883 unsigned n = 0;
1884
1885 if (len > 1 && *name == '0')
1886 goto out;
1887 while (len-- > 0) {
1888 unsigned c = *name++ - '0';
1889 if (c > 9)
1890 goto out;
1891 if (n >= (~0U-9)/10)
1892 goto out;
1893 n *= 10;
1894 n += c;
1895 }
1896 return n;
1897out:
1898 return ~0U;
1899}
1900
27932742
MS		 1901#define PROC_FDINFO_MAX 64
1902
3dcd25f3 1903static int proc_fd_info(struct inode *inode, struct path *path, char *info)
28a6d671
EB		 1904{
1905 struct task_struct *task = get_proc_task(inode);
1906 struct files_struct *files = NULL;
1907 struct file *file;
1908 int fd = proc_fd(inode);
99f89551 1909
99f89551 1910 if (task) {
28a6d671
EB		 1911 files = get_files_struct(task);
1912 put_task_struct(task);
1913 }
1914 if (files) {
1915 /*
1916 * We are not taking a ref to the file structure, so we must
1917 * hold ->file_lock.
1918 */
1919 spin_lock(&files->file_lock);
1920 file = fcheck_files(files, fd);
1921 if (file) {
1117f72e
LT		 1922 unsigned int f_flags;
1923 struct fdtable *fdt;
1924
1925 fdt = files_fdtable(files);
1926 f_flags = file->f_flags & ~O_CLOEXEC;
1927 if (FD_ISSET(fd, fdt->close_on_exec))
1928 f_flags |= O_CLOEXEC;
1929
3dcd25f3
JB		 1930 if (path) {
1931 *path = file->f_path;
1932 path_get(&file->f_path);
1933 }
27932742
MS		 1934 if (info)
1935 snprintf(info, PROC_FDINFO_MAX,
1936 "pos:\t%lli\n"
1937 "flags:\t0%o\n",
1938 (long long) file->f_pos,
1117f72e 1939 f_flags);
28a6d671
EB		 1940 spin_unlock(&files->file_lock);
1941 put_files_struct(files);
1942 return 0;
99f89551 1943 }
28a6d671
EB		 1944 spin_unlock(&files->file_lock);
1945 put_files_struct(files);
99f89551 1946 }
28a6d671 1947 return -ENOENT;
99f89551
EB		 1948}
1949
3dcd25f3 1950static int proc_fd_link(struct inode *inode, struct path *path)
27932742 1951{
3dcd25f3 1952 return proc_fd_info(inode, path, NULL);
27932742
MS		 1953}
1954
1da177e4
LT		 1955static int tid_fd_revalidate(struct dentry *dentry, struct nameidata *nd)
1956{
34286d66
NP		 1957 struct inode *inode;
1958 struct task_struct *task;
1959 int fd;
1da177e4 1960 struct files_struct *files;
c69e8d9c 1961 const struct cred *cred;
1da177e4 1962
34286d66
NP		 1963 if (nd && nd->flags & LOOKUP_RCU)
1964 return -ECHILD;
1965
1966 inode = dentry->d_inode;
1967 task = get_proc_task(inode);
1968 fd = proc_fd(inode);
1969
99f89551
EB		 1970 if (task) {
1971 files = get_files_struct(task);
1972 if (files) {
1973 rcu_read_lock();
1974 if (fcheck_files(files, fd)) {
1975 rcu_read_unlock();
1976 put_files_struct(files);
1977 if (task_dumpable(task)) {
c69e8d9c
DH		 1978 rcu_read_lock();
1979 cred = __task_cred(task);
1980 inode->i_uid = cred->euid;
1981 inode->i_gid = cred->egid;
1982 rcu_read_unlock();
99f89551
EB		 1983 } else {
1984 inode->i_uid = 0;
1985 inode->i_gid = 0;
1986 }
9ee8ab9f 1987 inode->i_mode &= ~(S_ISUID | S_ISGID);
99f89551
EB		 1988 security_task_to_inode(task, inode);
1989 put_task_struct(task);
1990 return 1;
1991 }
b835996f 1992 rcu_read_unlock();
1da177e4 1993 put_files_struct(files);
1da177e4 1994 }
99f89551 1995 put_task_struct(task);
1da177e4
LT		 1996 }
1997 d_drop(dentry);
1998 return 0;
1999}
2000
d72f71eb 2001static const struct dentry_operations tid_fd_dentry_operations =
1da177e4
LT		 2002{
2003 .d_revalidate = tid_fd_revalidate,
2004 .d_delete = pid_delete_dentry,
2005};
2006
444ceed8 2007static struct dentry *proc_fd_instantiate(struct inode *dir,
c5141e6d 2008 struct dentry *dentry, struct task_struct *task, const void *ptr)
1da177e4 2009{
c5141e6d 2010 unsigned fd = *(const unsigned *)ptr;
444ceed8
EB		 2011 struct file *file;
2012 struct files_struct *files;
2013 struct inode *inode;
2014 struct proc_inode *ei;
2015 struct dentry *error = ERR_PTR(-ENOENT);
1da177e4 2016
61a28784 2017 inode = proc_pid_make_inode(dir->i_sb, task);
1da177e4
LT		 2018 if (!inode)
2019 goto out;
2020 ei = PROC_I(inode);
aed7a6c4 2021 ei->fd = fd;
1da177e4
LT		 2022 files = get_files_struct(task);
2023 if (!files)
444ceed8 2024 goto out_iput;
1da177e4 2025 inode->i_mode = S_IFLNK;
ca99c1da
DS		 2026
2027 /*
2028 * We are not taking a ref to the file structure, so we must
2029 * hold ->file_lock.
2030 */
2031 spin_lock(&files->file_lock);
1da177e4
LT		 2032 file = fcheck_files(files, fd);
2033 if (!file)
444ceed8 2034 goto out_unlock;
aeb5d727 2035 if (file->f_mode & FMODE_READ)
1da177e4 2036 inode->i_mode |= S_IRUSR | S_IXUSR;
aeb5d727 2037 if (file->f_mode & FMODE_WRITE)
1da177e4 2038 inode->i_mode |= S_IWUSR | S_IXUSR;
ca99c1da 2039 spin_unlock(&files->file_lock);
1da177e4 2040 put_files_struct(files);
444ceed8 2041
1da177e4
LT		 2042 inode->i_op = &proc_pid_link_inode_operations;
2043 inode->i_size = 64;
2044 ei->op.proc_get_link = proc_fd_link;
fb045adb 2045 d_set_d_op(dentry, &tid_fd_dentry_operations);
1da177e4 2046 d_add(dentry, inode);
cd6a3ce9
EB		 2047 /* Close the race of the process dying before we return the dentry */
2048 if (tid_fd_revalidate(dentry, NULL))
444ceed8 2049 error = NULL;
1da177e4 2050
444ceed8
EB		 2051 out:
2052 return error;
2053out_unlock:
ca99c1da 2054 spin_unlock(&files->file_lock);
1da177e4 2055 put_files_struct(files);
444ceed8 2056out_iput:
1da177e4 2057 iput(inode);
cd6a3ce9 2058 goto out;
1da177e4
LT		 2059}
2060
27932742
MS		 2061static struct dentry *proc_lookupfd_common(struct inode *dir,
2062 struct dentry *dentry,
2063 instantiate_t instantiate)
444ceed8
EB		 2064{
2065 struct task_struct *task = get_proc_task(dir);
2066 unsigned fd = name_to_int(dentry);
2067 struct dentry *result = ERR_PTR(-ENOENT);
2068
2069 if (!task)
2070 goto out_no_task;
2071 if (fd == ~0U)
2072 goto out;
2073
27932742 2074 result = instantiate(dir, dentry, task, &fd);
444ceed8
EB		 2075out:
2076 put_task_struct(task);
2077out_no_task:
2078 return result;
2079}
2080
27932742
MS		 2081static int proc_readfd_common(struct file * filp, void * dirent,
2082 filldir_t filldir, instantiate_t instantiate)
28a6d671 2083{
2fddfeef 2084 struct dentry *dentry = filp->f_path.dentry;
28a6d671
EB		 2085 struct inode *inode = dentry->d_inode;
2086 struct task_struct *p = get_proc_task(inode);
457c2510 2087 unsigned int fd, ino;
28a6d671 2088 int retval;
28a6d671 2089 struct files_struct * files;
1da177e4 2090
28a6d671
EB		 2091 retval = -ENOENT;
2092 if (!p)
2093 goto out_no_task;
2094 retval = 0;
28a6d671
EB		 2095
2096 fd = filp->f_pos;
2097 switch (fd) {
2098 case 0:
2099 if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0)
2100 goto out;
2101 filp->f_pos++;
2102 case 1:
2103 ino = parent_ino(dentry);
2104 if (filldir(dirent, "..", 2, 1, ino, DT_DIR) < 0)
2105 goto out;
2106 filp->f_pos++;
2107 default:
2108 files = get_files_struct(p);
2109 if (!files)
2110 goto out;
2111 rcu_read_lock();
28a6d671 2112 for (fd = filp->f_pos-2;
9b4f526c 2113 fd < files_fdtable(files)->max_fds;
28a6d671 2114 fd++, filp->f_pos++) {
27932742
MS		 2115 char name[PROC_NUMBUF];
2116 int len;
28a6d671
EB		 2117
2118 if (!fcheck_files(files, fd))
2119 continue;
2120 rcu_read_unlock();
2121
27932742
MS		 2122 len = snprintf(name, sizeof(name), "%d", fd);
2123 if (proc_fill_cache(filp, dirent, filldir,
2124 name, len, instantiate,
2125 p, &fd) < 0) {
28a6d671
EB		 2126 rcu_read_lock();
2127 break;
2128 }
2129 rcu_read_lock();
2130 }
2131 rcu_read_unlock();
2132 put_files_struct(files);
2133 }
2134out:
2135 put_task_struct(p);
2136out_no_task:
2137 return retval;
2138}
2139
27932742
MS		 2140static struct dentry *proc_lookupfd(struct inode *dir, struct dentry *dentry,
2141 struct nameidata *nd)
2142{
2143 return proc_lookupfd_common(dir, dentry, proc_fd_instantiate);
2144}
2145
2146static int proc_readfd(struct file *filp, void *dirent, filldir_t filldir)
2147{
2148 return proc_readfd_common(filp, dirent, filldir, proc_fd_instantiate);
2149}
2150
2151static ssize_t proc_fdinfo_read(struct file *file, char __user *buf,
2152 size_t len, loff_t *ppos)
2153{
2154 char tmp[PROC_FDINFO_MAX];
3dcd25f3 2155 int err = proc_fd_info(file->f_path.dentry->d_inode, NULL, tmp);
27932742
MS		 2156 if (!err)
2157 err = simple_read_from_buffer(buf, len, ppos, tmp, strlen(tmp));
2158 return err;
2159}
2160
2161static const struct file_operations proc_fdinfo_file_operations = {
87df8424 2162 .open = nonseekable_open,
27932742 2163 .read = proc_fdinfo_read,
6038f373 2164 .llseek = no_llseek,
27932742
MS		 2165};
2166
00977a59 2167static const struct file_operations proc_fd_operations = {
28a6d671
EB		 2168 .read = generic_read_dir,
2169 .readdir = proc_readfd,
6038f373 2170 .llseek = default_llseek,
1da177e4
LT		 2171};
2172
8948e11f
AD		 2173/*
2174 * /proc/pid/fd needs a special permission handler so that a process can still
2175 * access /proc/self/fd after it has executed a setuid().
2176 */
10556cb2 2177static int proc_fd_permission(struct inode *inode, int mask)
8948e11f 2178{
2830ba7f 2179 int rv = generic_permission(inode, mask);
8948e11f
AD		 2180 if (rv == 0)
2181 return 0;
2182 if (task_pid(current) == proc_pid(inode))
2183 rv = 0;
2184 return rv;
2185}
2186
1da177e4
LT		 2187/*
2188 * proc directories can do almost nothing..
2189 */
c5ef1c42 2190static const struct inode_operations proc_fd_inode_operations = {
1da177e4 2191 .lookup = proc_lookupfd,
8948e11f 2192 .permission = proc_fd_permission,
6d76fa58 2193 .setattr = proc_setattr,
1da177e4
LT		 2194};
2195
27932742
MS		 2196static struct dentry *proc_fdinfo_instantiate(struct inode *dir,
2197 struct dentry *dentry, struct task_struct *task, const void *ptr)
2198{
2199 unsigned fd = *(unsigned *)ptr;
2200 struct inode *inode;
2201 struct proc_inode *ei;
2202 struct dentry *error = ERR_PTR(-ENOENT);
2203
2204 inode = proc_pid_make_inode(dir->i_sb, task);
2205 if (!inode)
2206 goto out;
2207 ei = PROC_I(inode);
2208 ei->fd = fd;
2209 inode->i_mode = S_IFREG | S_IRUSR;
2210 inode->i_fop = &proc_fdinfo_file_operations;
fb045adb 2211 d_set_d_op(dentry, &tid_fd_dentry_operations);
27932742
MS		 2212 d_add(dentry, inode);
2213 /* Close the race of the process dying before we return the dentry */
2214 if (tid_fd_revalidate(dentry, NULL))
2215 error = NULL;
2216
2217 out:
2218 return error;
2219}
2220
2221static struct dentry *proc_lookupfdinfo(struct inode *dir,
2222 struct dentry *dentry,
2223 struct nameidata *nd)
2224{
2225 return proc_lookupfd_common(dir, dentry, proc_fdinfo_instantiate);
2226}
2227
2228static int proc_readfdinfo(struct file *filp, void *dirent, filldir_t filldir)
2229{
2230 return proc_readfd_common(filp, dirent, filldir,
2231 proc_fdinfo_instantiate);
2232}
2233
2234static const struct file_operations proc_fdinfo_operations = {
2235 .read = generic_read_dir,
2236 .readdir = proc_readfdinfo,
6038f373 2237 .llseek = default_llseek,
27932742
MS		 2238};
2239
2240/*
2241 * proc directories can do almost nothing..
2242 */
2243static const struct inode_operations proc_fdinfo_inode_operations = {
2244 .lookup = proc_lookupfdinfo,
2245 .setattr = proc_setattr,
2246};
2247
2248
444ceed8 2249static struct dentry *proc_pident_instantiate(struct inode *dir,
c5141e6d 2250 struct dentry *dentry, struct task_struct *task, const void *ptr)
444ceed8 2251{
c5141e6d 2252 const struct pid_entry *p = ptr;
444ceed8
EB		 2253 struct inode *inode;
2254 struct proc_inode *ei;
bd6daba9 2255 struct dentry *error = ERR_PTR(-ENOENT);
444ceed8 2256
61a28784 2257 inode = proc_pid_make_inode(dir->i_sb, task);
444ceed8
EB		 2258 if (!inode)
2259 goto out;
2260
2261 ei = PROC_I(inode);
2262 inode->i_mode = p->mode;
2263 if (S_ISDIR(inode->i_mode))
2264 inode->i_nlink = 2; /* Use getattr to fix if necessary */
2265 if (p->iop)
2266 inode->i_op = p->iop;
2267 if (p->fop)
2268 inode->i_fop = p->fop;
2269 ei->op = p->op;
fb045adb 2270 d_set_d_op(dentry, &pid_dentry_operations);
444ceed8
EB		 2271 d_add(dentry, inode);
2272 /* Close the race of the process dying before we return the dentry */
2273 if (pid_revalidate(dentry, NULL))
2274 error = NULL;
2275out:
2276 return error;
2277}
2278
1da177e4
LT		 2279static struct dentry *proc_pident_lookup(struct inode *dir,
2280 struct dentry *dentry,
c5141e6d 2281 const struct pid_entry *ents,
7bcd6b0e 2282 unsigned int nents)
1da177e4 2283{
cd6a3ce9 2284 struct dentry *error;
99f89551 2285 struct task_struct *task = get_proc_task(dir);
c5141e6d 2286 const struct pid_entry *p, *last;
1da177e4 2287
cd6a3ce9 2288 error = ERR_PTR(-ENOENT);
1da177e4 2289
99f89551
EB		 2290 if (!task)
2291 goto out_no_task;
1da177e4 2292
20cdc894
EB		 2293 /*
2294 * Yes, it does not scale. And it should not. Don't add
2295 * new entries into /proc/<tgid>/ without very good reasons.
2296 */
7bcd6b0e
EB		 2297 last = &ents[nents - 1];
2298 for (p = ents; p <= last; p++) {
1da177e4
LT		 2299 if (p->len != dentry->d_name.len)
2300 continue;
2301 if (!memcmp(dentry->d_name.name, p->name, p->len))
2302 break;
2303 }
7bcd6b0e 2304 if (p > last)
1da177e4
LT		 2305 goto out;
2306
444ceed8 2307 error = proc_pident_instantiate(dir, dentry, task, p);
1da177e4 2308out:
99f89551
EB		 2309 put_task_struct(task);
2310out_no_task:
cd6a3ce9 2311 return error;
1da177e4
LT		 2312}
2313
c5141e6d
ED		 2314static int proc_pident_fill_cache(struct file *filp, void *dirent,
2315 filldir_t filldir, struct task_struct *task, const struct pid_entry *p)
61a28784
EB		 2316{
2317 return proc_fill_cache(filp, dirent, filldir, p->name, p->len,
2318 proc_pident_instantiate, task, p);
2319}
2320
28a6d671
EB		 2321static int proc_pident_readdir(struct file *filp,
2322 void *dirent, filldir_t filldir,
c5141e6d 2323 const struct pid_entry *ents, unsigned int nents)
28a6d671
EB		 2324{
2325 int i;
2fddfeef 2326 struct dentry *dentry = filp->f_path.dentry;
28a6d671
EB		 2327 struct inode *inode = dentry->d_inode;
2328 struct task_struct *task = get_proc_task(inode);
c5141e6d 2329 const struct pid_entry *p, *last;
28a6d671
EB		 2330 ino_t ino;
2331 int ret;
2332
2333 ret = -ENOENT;
2334 if (!task)
61a28784 2335 goto out_no_task;
28a6d671
EB		 2336
2337 ret = 0;
28a6d671
EB		 2338 i = filp->f_pos;
2339 switch (i) {
2340 case 0:
2341 ino = inode->i_ino;
2342 if (filldir(dirent, ".", 1, i, ino, DT_DIR) < 0)
2343 goto out;
2344 i++;
2345 filp->f_pos++;
2346 /* fall through */
2347 case 1:
2348 ino = parent_ino(dentry);
2349 if (filldir(dirent, "..", 2, i, ino, DT_DIR) < 0)
2350 goto out;
2351 i++;
2352 filp->f_pos++;
2353 /* fall through */
2354 default:
2355 i -= 2;
2356 if (i >= nents) {
2357 ret = 1;
2358 goto out;
2359 }
2360 p = ents + i;
7bcd6b0e
EB		 2361 last = &ents[nents - 1];
2362 while (p <= last) {
61a28784 2363 if (proc_pident_fill_cache(filp, dirent, filldir, task, p) < 0)
28a6d671
EB		 2364 goto out;
2365 filp->f_pos++;
2366 p++;
2367 }
2368 }
2369
2370 ret = 1;
2371out:
61a28784
EB		 2372 put_task_struct(task);
2373out_no_task:
28a6d671 2374 return ret;
1da177e4
LT		 2375}
2376
28a6d671
EB		 2377#ifdef CONFIG_SECURITY
2378static ssize_t proc_pid_attr_read(struct file * file, char __user * buf,
2379 size_t count, loff_t *ppos)
2380{
2fddfeef 2381 struct inode * inode = file->f_path.dentry->d_inode;
04ff9708 2382 char *p = NULL;
28a6d671
EB		 2383 ssize_t length;
2384 struct task_struct *task = get_proc_task(inode);
2385
28a6d671 2386 if (!task)
04ff9708 2387 return -ESRCH;
28a6d671
EB		 2388
2389 length = security_getprocattr(task,
2fddfeef 2390 (char*)file->f_path.dentry->d_name.name,
04ff9708 2391 &p);
28a6d671 2392 put_task_struct(task);
04ff9708
AV		 2393 if (length > 0)
2394 length = simple_read_from_buffer(buf, count, ppos, p, length);
2395 kfree(p);
28a6d671 2396 return length;
1da177e4
LT		 2397}
2398
28a6d671
EB		 2399static ssize_t proc_pid_attr_write(struct file * file, const char __user * buf,
2400 size_t count, loff_t *ppos)
2401{
2fddfeef 2402 struct inode * inode = file->f_path.dentry->d_inode;
28a6d671
EB		 2403 char *page;
2404 ssize_t length;
2405 struct task_struct *task = get_proc_task(inode);
2406
2407 length = -ESRCH;
2408 if (!task)
2409 goto out_no_task;
2410 if (count > PAGE_SIZE)
2411 count = PAGE_SIZE;
2412
2413 /* No partial writes. */
2414 length = -EINVAL;
2415 if (*ppos != 0)
2416 goto out;
2417
2418 length = -ENOMEM;
e12ba74d 2419 page = (char*)__get_free_page(GFP_TEMPORARY);
28a6d671
EB		 2420 if (!page)
2421 goto out;
2422
2423 length = -EFAULT;
2424 if (copy_from_user(page, buf, count))
2425 goto out_free;
2426
107db7c7 2427 /* Guard against adverse ptrace interaction */
9b1bf12d 2428 length = mutex_lock_interruptible(&task->signal->cred_guard_mutex);
107db7c7
DH		 2429 if (length < 0)
2430 goto out_free;
2431
28a6d671 2432 length = security_setprocattr(task,
2fddfeef 2433 (char*)file->f_path.dentry->d_name.name,
28a6d671 2434 (void*)page, count);
9b1bf12d 2435 mutex_unlock(&task->signal->cred_guard_mutex);
28a6d671
EB		 2436out_free:
2437 free_page((unsigned long) page);
2438out:
2439 put_task_struct(task);
2440out_no_task:
2441 return length;
2442}
2443
00977a59 2444static const struct file_operations proc_pid_attr_operations = {
28a6d671
EB		 2445 .read = proc_pid_attr_read,
2446 .write = proc_pid_attr_write,
87df8424 2447 .llseek = generic_file_llseek,
28a6d671
EB		 2448};
2449
c5141e6d 2450static const struct pid_entry attr_dir_stuff[] = {
631f9c18
AD		 2451 REG("current", S_IRUGO|S_IWUGO, proc_pid_attr_operations),
2452 REG("prev", S_IRUGO, proc_pid_attr_operations),
2453 REG("exec", S_IRUGO|S_IWUGO, proc_pid_attr_operations),
2454 REG("fscreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations),
2455 REG("keycreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations),
2456 REG("sockcreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations),
28a6d671
EB		 2457};
2458
72d9dcfc 2459static int proc_attr_dir_readdir(struct file * filp,
28a6d671
EB		 2460 void * dirent, filldir_t filldir)
2461{
2462 return proc_pident_readdir(filp,dirent,filldir,
72d9dcfc 2463 attr_dir_stuff,ARRAY_SIZE(attr_dir_stuff));
28a6d671
EB		 2464}
2465
00977a59 2466static const struct file_operations proc_attr_dir_operations = {
1da177e4 2467 .read = generic_read_dir,
72d9dcfc 2468 .readdir = proc_attr_dir_readdir,
6038f373 2469 .llseek = default_llseek,
1da177e4
LT		 2470};
2471
72d9dcfc 2472static struct dentry *proc_attr_dir_lookup(struct inode *dir,
28a6d671
EB		 2473 struct dentry *dentry, struct nameidata *nd)
2474{
7bcd6b0e
EB		 2475 return proc_pident_lookup(dir, dentry,
2476 attr_dir_stuff, ARRAY_SIZE(attr_dir_stuff));
28a6d671
EB		 2477}
2478
c5ef1c42 2479static const struct inode_operations proc_attr_dir_inode_operations = {
72d9dcfc 2480 .lookup = proc_attr_dir_lookup,
99f89551 2481 .getattr = pid_getattr,
6d76fa58 2482 .setattr = proc_setattr,
1da177e4
LT		 2483};
2484
28a6d671
EB		 2485#endif
2486
698ba7b5 2487#ifdef CONFIG_ELF_CORE
3cb4a0bb
KH		 2488static ssize_t proc_coredump_filter_read(struct file *file, char __user *buf,
2489 size_t count, loff_t *ppos)
2490{
2491 struct task_struct *task = get_proc_task(file->f_dentry->d_inode);
2492 struct mm_struct *mm;
2493 char buffer[PROC_NUMBUF];
2494 size_t len;
2495 int ret;
2496
2497 if (!task)
2498 return -ESRCH;
2499
2500 ret = 0;
2501 mm = get_task_mm(task);
2502 if (mm) {
2503 len = snprintf(buffer, sizeof(buffer), "%08lx\n",
2504 ((mm->flags & MMF_DUMP_FILTER_MASK) >>
2505 MMF_DUMP_FILTER_SHIFT));
2506 mmput(mm);
2507 ret = simple_read_from_buffer(buf, count, ppos, buffer, len);
2508 }
2509
2510 put_task_struct(task);
2511
2512 return ret;
2513}
2514
2515static ssize_t proc_coredump_filter_write(struct file *file,
2516 const char __user *buf,
2517 size_t count,
2518 loff_t *ppos)
2519{
2520 struct task_struct *task;
2521 struct mm_struct *mm;
2522 char buffer[PROC_NUMBUF], *end;
2523 unsigned int val;
2524 int ret;
2525 int i;
2526 unsigned long mask;
2527
2528 ret = -EFAULT;
2529 memset(buffer, 0, sizeof(buffer));
2530 if (count > sizeof(buffer) - 1)
2531 count = sizeof(buffer) - 1;
2532 if (copy_from_user(buffer, buf, count))
2533 goto out_no_task;
2534
2535 ret = -EINVAL;
2536 val = (unsigned int)simple_strtoul(buffer, &end, 0);
2537 if (*end == '\n')
2538 end++;
2539 if (end - buffer == 0)
2540 goto out_no_task;
2541
2542 ret = -ESRCH;
2543 task = get_proc_task(file->f_dentry->d_inode);
2544 if (!task)
2545 goto out_no_task;
2546
2547 ret = end - buffer;
2548 mm = get_task_mm(task);
2549 if (!mm)
2550 goto out_no_mm;
2551
2552 for (i = 0, mask = 1; i < MMF_DUMP_FILTER_BITS; i++, mask <<= 1) {
2553 if (val & mask)
2554 set_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags);
2555 else
2556 clear_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags);
2557 }
2558
2559 mmput(mm);
2560 out_no_mm:
2561 put_task_struct(task);
2562 out_no_task:
2563 return ret;
2564}
2565
2566static const struct file_operations proc_coredump_filter_operations = {
2567 .read = proc_coredump_filter_read,
2568 .write = proc_coredump_filter_write,
87df8424 2569 .llseek = generic_file_llseek,
3cb4a0bb
KH		 2570};
2571#endif
2572
28a6d671
EB		 2573/*
2574 * /proc/self:
2575 */
2576static int proc_self_readlink(struct dentry *dentry, char __user *buffer,
2577 int buflen)
2578{
488e5bc4 2579 struct pid_namespace *ns = dentry->d_sb->s_fs_info;
b55fcb22 2580 pid_t tgid = task_tgid_nr_ns(current, ns);
28a6d671 2581 char tmp[PROC_NUMBUF];
b55fcb22 2582 if (!tgid)
488e5bc4 2583 return -ENOENT;
b55fcb22 2584 sprintf(tmp, "%d", tgid);
28a6d671
EB		 2585 return vfs_readlink(dentry,buffer,buflen,tmp);
2586}
2587
2588static void *proc_self_follow_link(struct dentry *dentry, struct nameidata *nd)
2589{
488e5bc4 2590 struct pid_namespace *ns = dentry->d_sb->s_fs_info;
b55fcb22 2591 pid_t tgid = task_tgid_nr_ns(current, ns);
7fee4868
AV		 2592 char *name = ERR_PTR(-ENOENT);
2593 if (tgid) {
2594 name = __getname();
2595 if (!name)
2596 name = ERR_PTR(-ENOMEM);
2597 else
2598 sprintf(name, "%d", tgid);
2599 }
2600 nd_set_link(nd, name);
2601 return NULL;
2602}
2603
2604static void proc_self_put_link(struct dentry *dentry, struct nameidata *nd,
2605 void *cookie)
2606{
2607 char *s = nd_get_link(nd);
2608 if (!IS_ERR(s))
2609 __putname(s);
28a6d671
EB		 2610}
2611
c5ef1c42 2612static const struct inode_operations proc_self_inode_operations = {
28a6d671
EB		 2613 .readlink = proc_self_readlink,
2614 .follow_link = proc_self_follow_link,
7fee4868 2615 .put_link = proc_self_put_link,
28a6d671
EB		 2616};
2617
801199ce
EB		 2618/*
2619 * proc base
2620 *
2621 * These are the directory entries in the root directory of /proc
2622 * that properly belong to the /proc filesystem, as they describe
2623 * describe something that is process related.
2624 */
c5141e6d 2625static const struct pid_entry proc_base_stuff[] = {
61a28784 2626 NOD("self", S_IFLNK|S_IRWXUGO,
801199ce 2627 &proc_self_inode_operations, NULL, {}),
801199ce
EB		 2628};
2629
444ceed8 2630static struct dentry *proc_base_instantiate(struct inode *dir,
c5141e6d 2631 struct dentry *dentry, struct task_struct *task, const void *ptr)
801199ce 2632{
c5141e6d 2633 const struct pid_entry *p = ptr;
801199ce 2634 struct inode *inode;
801199ce 2635 struct proc_inode *ei;
73d36460 2636 struct dentry *error;
801199ce
EB		 2637
2638 /* Allocate the inode */
2639 error = ERR_PTR(-ENOMEM);
2640 inode = new_inode(dir->i_sb);
2641 if (!inode)
2642 goto out;
2643
2644 /* Initialize the inode */
2645 ei = PROC_I(inode);
85fe4025 2646 inode->i_ino = get_next_ino();
801199ce 2647 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
801199ce
EB		 2648
2649 /*
2650 * grab the reference to the task.
2651 */
1a657f78 2652 ei->pid = get_task_pid(task, PIDTYPE_PID);
801199ce
EB		 2653 if (!ei->pid)
2654 goto out_iput;
2655
801199ce
EB		 2656 inode->i_mode = p->mode;
2657 if (S_ISDIR(inode->i_mode))
2658 inode->i_nlink = 2;
2659 if (S_ISLNK(inode->i_mode))
2660 inode->i_size = 64;
2661 if (p->iop)
2662 inode->i_op = p->iop;
2663 if (p->fop)
2664 inode->i_fop = p->fop;
2665 ei->op = p->op;
801199ce
EB		 2666 d_add(dentry, inode);
2667 error = NULL;
2668out:
801199ce
EB		 2669 return error;
2670out_iput:
2671 iput(inode);
2672 goto out;
2673}
2674
444ceed8
EB		 2675static struct dentry *proc_base_lookup(struct inode *dir, struct dentry *dentry)
2676{
2677 struct dentry *error;
2678 struct task_struct *task = get_proc_task(dir);
c5141e6d 2679 const struct pid_entry *p, *last;
444ceed8
EB		 2680
2681 error = ERR_PTR(-ENOENT);
2682
2683 if (!task)
2684 goto out_no_task;
2685
2686 /* Lookup the directory entry */
7bcd6b0e
EB		 2687 last = &proc_base_stuff[ARRAY_SIZE(proc_base_stuff) - 1];
2688 for (p = proc_base_stuff; p <= last; p++) {
444ceed8
EB		 2689 if (p->len != dentry->d_name.len)
2690 continue;
2691 if (!memcmp(dentry->d_name.name, p->name, p->len))
2692 break;
2693 }
7bcd6b0e 2694 if (p > last)
444ceed8
EB		 2695 goto out;
2696
2697 error = proc_base_instantiate(dir, dentry, task, p);
2698
2699out:
2700 put_task_struct(task);
2701out_no_task:
2702 return error;
2703}
2704
c5141e6d
ED		 2705static int proc_base_fill_cache(struct file *filp, void *dirent,
2706 filldir_t filldir, struct task_struct *task, const struct pid_entry *p)
61a28784
EB		 2707{
2708 return proc_fill_cache(filp, dirent, filldir, p->name, p->len,
2709 proc_base_instantiate, task, p);
2710}
2711
aba76fdb 2712#ifdef CONFIG_TASK_IO_ACCOUNTING
297c5d92
AR		 2713static int do_io_accounting(struct task_struct *task, char *buffer, int whole)
2714{
940389b8 2715 struct task_io_accounting acct = task->ioac;
5995477a 2716 unsigned long flags;
293eb1e7 2717 int result;
5995477a 2718
293eb1e7
VK		 2719 result = mutex_lock_killable(&task->signal->cred_guard_mutex);
2720 if (result)
2721 return result;
2722
2723 if (!ptrace_may_access(task, PTRACE_MODE_READ)) {
2724 result = -EACCES;
2725 goto out_unlock;
2726 }
1d1221f3 2727
5995477a
AR		 2728 if (whole && lock_task_sighand(task, &flags)) {
2729 struct task_struct *t = task;
2730
2731 task_io_accounting_add(&acct, &task->signal->ioac);
2732 while_each_thread(task, t)
2733 task_io_accounting_add(&acct, &t->ioac);
2734
2735 unlock_task_sighand(task, &flags);
297c5d92 2736 }
293eb1e7 2737 result = sprintf(buffer,
aba76fdb
AM		 2738 "rchar: %llu\n"
2739 "wchar: %llu\n"
2740 "syscr: %llu\n"
2741 "syscw: %llu\n"
2742 "read_bytes: %llu\n"
2743 "write_bytes: %llu\n"
2744 "cancelled_write_bytes: %llu\n",
7c44319d
AB		 2745 (unsigned long long)acct.rchar,
2746 (unsigned long long)acct.wchar,
2747 (unsigned long long)acct.syscr,
2748 (unsigned long long)acct.syscw,
2749 (unsigned long long)acct.read_bytes,
2750 (unsigned long long)acct.write_bytes,
2751 (unsigned long long)acct.cancelled_write_bytes);
293eb1e7
VK		 2752out_unlock:
2753 mutex_unlock(&task->signal->cred_guard_mutex);
2754 return result;
297c5d92
AR		 2755}
2756
2757static int proc_tid_io_accounting(struct task_struct *task, char *buffer)
2758{
2759 return do_io_accounting(task, buffer, 0);
aba76fdb 2760}
297c5d92
AR		 2761
2762static int proc_tgid_io_accounting(struct task_struct *task, char *buffer)
2763{
2764 return do_io_accounting(task, buffer, 1);
2765}
2766#endif /* CONFIG_TASK_IO_ACCOUNTING */
aba76fdb 2767
47830723
KC		 2768static int proc_pid_personality(struct seq_file *m, struct pid_namespace *ns,
2769 struct pid *pid, struct task_struct *task)
2770{
a9712bc1
AV		 2771 int err = lock_trace(task);
2772 if (!err) {
2773 seq_printf(m, "%08x\n", task->personality);
2774 unlock_trace(task);
2775 }
2776 return err;
47830723
KC		 2777}
2778
28a6d671
EB		 2779/*
2780 * Thread groups
2781 */
00977a59 2782static const struct file_operations proc_task_operations;
c5ef1c42 2783static const struct inode_operations proc_task_inode_operations;
20cdc894 2784
c5141e6d 2785static const struct pid_entry tgid_base_stuff[] = {
631f9c18
AD		 2786 DIR("task", S_IRUGO|S_IXUGO, proc_task_inode_operations, proc_task_operations),
2787 DIR("fd", S_IRUSR|S_IXUSR, proc_fd_inode_operations, proc_fd_operations),
2788 DIR("fdinfo", S_IRUSR|S_IXUSR, proc_fdinfo_inode_operations, proc_fdinfo_operations),
6b4e306a 2789 DIR("ns", S_IRUSR|S_IXUGO, proc_ns_dir_inode_operations, proc_ns_dir_operations),
b2211a36 2790#ifdef CONFIG_NET
631f9c18 2791 DIR("net", S_IRUGO|S_IXUGO, proc_net_inode_operations, proc_net_operations),
b2211a36 2792#endif
631f9c18
AD		 2793 REG("environ", S_IRUSR, proc_environ_operations),
2794 INF("auxv", S_IRUSR, proc_pid_auxv),
2795 ONE("status", S_IRUGO, proc_pid_status),
a9712bc1 2796 ONE("personality", S_IRUGO, proc_pid_personality),
3036e7b4 2797 INF("limits", S_IRUGO, proc_pid_limits),
43ae34cb 2798#ifdef CONFIG_SCHED_DEBUG
631f9c18 2799 REG("sched", S_IRUGO|S_IWUSR, proc_pid_sched_operations),
5091faa4
MG		 2800#endif
2801#ifdef CONFIG_SCHED_AUTOGROUP
2802 REG("autogroup", S_IRUGO|S_IWUSR, proc_pid_sched_autogroup_operations),
ebcb6734 2803#endif
4614a696 2804 REG("comm", S_IRUGO|S_IWUSR, proc_pid_set_comm_operations),
ebcb6734 2805#ifdef CONFIG_HAVE_ARCH_TRACEHOOK
a9712bc1 2806 INF("syscall", S_IRUGO, proc_pid_syscall),
43ae34cb 2807#endif
631f9c18
AD		 2808 INF("cmdline", S_IRUGO, proc_pid_cmdline),
2809 ONE("stat", S_IRUGO, proc_tgid_stat),
2810 ONE("statm", S_IRUGO, proc_pid_statm),
2811 REG("maps", S_IRUGO, proc_maps_operations),
28a6d671 2812#ifdef CONFIG_NUMA
631f9c18 2813 REG("numa_maps", S_IRUGO, proc_numa_maps_operations),
28a6d671 2814#endif
631f9c18
AD		 2815 REG("mem", S_IRUSR|S_IWUSR, proc_mem_operations),
2816 LNK("cwd", proc_cwd_link),
2817 LNK("root", proc_root_link),
2818 LNK("exe", proc_exe_link),
2819 REG("mounts", S_IRUGO, proc_mounts_operations),
2820 REG("mountinfo", S_IRUGO, proc_mountinfo_operations),
2821 REG("mountstats", S_IRUSR, proc_mountstats_operations),
1e883281 2822#ifdef CONFIG_PROC_PAGE_MONITOR
631f9c18
AD		 2823 REG("clear_refs", S_IWUSR, proc_clear_refs_operations),
2824 REG("smaps", S_IRUGO, proc_smaps_operations),
ca6b0bf0 2825 REG("pagemap", S_IRUGO, proc_pagemap_operations),
28a6d671
EB		 2826#endif
2827#ifdef CONFIG_SECURITY
631f9c18 2828 DIR("attr", S_IRUGO|S_IXUGO, proc_attr_dir_inode_operations, proc_attr_dir_operations),
28a6d671
EB		 2829#endif
2830#ifdef CONFIG_KALLSYMS
631f9c18 2831 INF("wchan", S_IRUGO, proc_pid_wchan),
28a6d671 2832#endif
2ec220e2 2833#ifdef CONFIG_STACKTRACE
a9712bc1 2834 ONE("stack", S_IRUGO, proc_pid_stack),
28a6d671
EB		 2835#endif
2836#ifdef CONFIG_SCHEDSTATS
631f9c18 2837 INF("schedstat", S_IRUGO, proc_pid_schedstat),
28a6d671 2838#endif
9745512c 2839#ifdef CONFIG_LATENCYTOP
631f9c18 2840 REG("latency", S_IRUGO, proc_lstats_operations),
9745512c 2841#endif
8793d854 2842#ifdef CONFIG_PROC_PID_CPUSET
631f9c18 2843 REG("cpuset", S_IRUGO, proc_cpuset_operations),
a424316c
PM		 2844#endif
2845#ifdef CONFIG_CGROUPS
631f9c18 2846 REG("cgroup", S_IRUGO, proc_cgroup_operations),
28a6d671 2847#endif
631f9c18
AD		 2848 INF("oom_score", S_IRUGO, proc_oom_score),
2849 REG("oom_adj", S_IRUGO|S_IWUSR, proc_oom_adjust_operations),
a63d83f4 2850 REG("oom_score_adj", S_IRUGO|S_IWUSR, proc_oom_score_adj_operations),
28a6d671 2851#ifdef CONFIG_AUDITSYSCALL
631f9c18
AD		 2852 REG("loginuid", S_IWUSR|S_IRUGO, proc_loginuid_operations),
2853 REG("sessionid", S_IRUGO, proc_sessionid_operations),
28a6d671 2854#endif
f4f154fd 2855#ifdef CONFIG_FAULT_INJECTION
631f9c18 2856 REG("make-it-fail", S_IRUGO|S_IWUSR, proc_fault_inject_operations),
f4f154fd 2857#endif
698ba7b5 2858#ifdef CONFIG_ELF_CORE
631f9c18 2859 REG("coredump_filter", S_IRUGO|S_IWUSR, proc_coredump_filter_operations),
3cb4a0bb 2860#endif
aba76fdb 2861#ifdef CONFIG_TASK_IO_ACCOUNTING
1d1221f3 2862 INF("io", S_IRUSR, proc_tgid_io_accounting),
aba76fdb 2863#endif
f133ecca
CM		 2864#ifdef CONFIG_HARDWALL
2865 INF("hardwall", S_IRUGO, proc_pid_hardwall),
2866#endif
28a6d671 2867};
1da177e4 2868
28a6d671 2869static int proc_tgid_base_readdir(struct file * filp,
1da177e4
LT		 2870 void * dirent, filldir_t filldir)
2871{
2872 return proc_pident_readdir(filp,dirent,filldir,
28a6d671 2873 tgid_base_stuff,ARRAY_SIZE(tgid_base_stuff));
1da177e4
LT		 2874}
2875
00977a59 2876static const struct file_operations proc_tgid_base_operations = {
1da177e4 2877 .read = generic_read_dir,
28a6d671 2878 .readdir = proc_tgid_base_readdir,
6038f373 2879 .llseek = default_llseek,
1da177e4
LT		 2880};
2881
28a6d671 2882static struct dentry *proc_tgid_base_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd){
7bcd6b0e
EB		 2883 return proc_pident_lookup(dir, dentry,
2884 tgid_base_stuff, ARRAY_SIZE(tgid_base_stuff));
1da177e4
LT		 2885}
2886
c5ef1c42 2887static const struct inode_operations proc_tgid_base_inode_operations = {
28a6d671 2888 .lookup = proc_tgid_base_lookup,
99f89551 2889 .getattr = pid_getattr,
6d76fa58 2890 .setattr = proc_setattr,
1da177e4 2891};
1da177e4 2892
60347f67 2893static void proc_flush_task_mnt(struct vfsmount *mnt, pid_t pid, pid_t tgid)
1da177e4 2894{
48e6484d 2895 struct dentry *dentry, *leader, *dir;
8578cea7 2896 char buf[PROC_NUMBUF];
48e6484d
EB		 2897 struct qstr name;
2898
2899 name.name = buf;
60347f67
PE		 2900 name.len = snprintf(buf, sizeof(buf), "%d", pid);
2901 dentry = d_hash_and_lookup(mnt->mnt_root, &name);
48e6484d 2902 if (dentry) {
29f12ca3 2903 shrink_dcache_parent(dentry);
48e6484d
EB		 2904 d_drop(dentry);
2905 dput(dentry);
2906 }
1da177e4 2907
48e6484d 2908 name.name = buf;
60347f67
PE		 2909 name.len = snprintf(buf, sizeof(buf), "%d", tgid);
2910 leader = d_hash_and_lookup(mnt->mnt_root, &name);
48e6484d
EB		 2911 if (!leader)
2912 goto out;
1da177e4 2913
48e6484d
EB		 2914 name.name = "task";
2915 name.len = strlen(name.name);
2916 dir = d_hash_and_lookup(leader, &name);
2917 if (!dir)
2918 goto out_put_leader;
2919
2920 name.name = buf;
60347f67 2921 name.len = snprintf(buf, sizeof(buf), "%d", pid);
48e6484d
EB		 2922 dentry = d_hash_and_lookup(dir, &name);
2923 if (dentry) {
2924 shrink_dcache_parent(dentry);
2925 d_drop(dentry);
2926 dput(dentry);
1da177e4 2927 }
48e6484d
EB		 2928
2929 dput(dir);
2930out_put_leader:
2931 dput(leader);
2932out:
2933 return;
1da177e4
LT		 2934}
2935
0895e91d
RD		 2936/**
2937 * proc_flush_task - Remove dcache entries for @task from the /proc dcache.
2938 * @task: task that should be flushed.
2939 *
2940 * When flushing dentries from proc, one needs to flush them from global
60347f67 2941 * proc (proc_mnt) and from all the namespaces' procs this task was seen
0895e91d
RD		 2942 * in. This call is supposed to do all of this job.
2943 *
2944 * Looks in the dcache for
2945 * /proc/@pid
2946 * /proc/@tgid/task/@pid
2947 * if either directory is present flushes it and all of it'ts children
2948 * from the dcache.
2949 *
2950 * It is safe and reasonable to cache /proc entries for a task until
2951 * that task exits. After that they just clog up the dcache with
2952 * useless entries, possibly causing useful dcache entries to be
2953 * flushed instead. This routine is proved to flush those useless
2954 * dcache entries at process exit time.
2955 *
2956 * NOTE: This routine is just an optimization so it does not guarantee
2957 * that no dcache entries will exist at process exit time it
2958 * just makes it very unlikely that any will persist.
60347f67
PE		 2959 */
2960
2961void proc_flush_task(struct task_struct *task)
2962{
9fcc2d15 2963 int i;
9b4d1cbe 2964 struct pid *pid, *tgid;
130f77ec
PE		 2965 struct upid *upid;
2966
130f77ec 2967 pid = task_pid(task);
9b4d1cbe 2968 tgid = task_tgid(task);
130f77ec 2969
9fcc2d15 2970 for (i = 0; i <= pid->level; i++) {
130f77ec
PE		 2971 upid = &pid->numbers[i];
2972 proc_flush_task_mnt(upid->ns->proc_mnt, upid->nr,
9b4d1cbe 2973 tgid->numbers[i].nr);
130f77ec 2974 }
6f4e6433
PE		 2975
2976 upid = &pid->numbers[pid->level];
2977 if (upid->nr == 1)
2978 pid_ns_release_proc(upid->ns);
60347f67
PE		 2979}
2980
9711ef99
AB		 2981static struct dentry *proc_pid_instantiate(struct inode *dir,
2982 struct dentry * dentry,
c5141e6d 2983 struct task_struct *task, const void *ptr)
444ceed8
EB		 2984{
2985 struct dentry *error = ERR_PTR(-ENOENT);
2986 struct inode *inode;
2987
61a28784 2988 inode = proc_pid_make_inode(dir->i_sb, task);
444ceed8
EB		 2989 if (!inode)
2990 goto out;
2991
2992 inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO;
2993 inode->i_op = &proc_tgid_base_inode_operations;
2994 inode->i_fop = &proc_tgid_base_operations;
2995 inode->i_flags|=S_IMMUTABLE;
aed54175
VN		 2996
2997 inode->i_nlink = 2 + pid_entry_count_dirs(tgid_base_stuff,
2998 ARRAY_SIZE(tgid_base_stuff));
444ceed8 2999
fb045adb 3000 d_set_d_op(dentry, &pid_dentry_operations);
444ceed8
EB		 3001
3002 d_add(dentry, inode);
3003 /* Close the race of the process dying before we return the dentry */
3004 if (pid_revalidate(dentry, NULL))
3005 error = NULL;
3006out:
3007 return error;
3008}
3009
1da177e4
LT		 3010struct dentry *proc_pid_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd)
3011{
73d36460 3012 struct dentry *result;
1da177e4 3013 struct task_struct *task;
1da177e4 3014 unsigned tgid;
b488893a 3015 struct pid_namespace *ns;
1da177e4 3016
801199ce
EB		 3017 result = proc_base_lookup(dir, dentry);
3018 if (!IS_ERR(result) || PTR_ERR(result) != -ENOENT)
3019 goto out;
3020
1da177e4
LT		 3021 tgid = name_to_int(dentry);
3022 if (tgid == ~0U)
3023 goto out;
3024
b488893a 3025 ns = dentry->d_sb->s_fs_info;
de758734 3026 rcu_read_lock();
b488893a 3027 task = find_task_by_pid_ns(tgid, ns);
1da177e4
LT		 3028 if (task)
3029 get_task_struct(task);
de758734 3030 rcu_read_unlock();
1da177e4
LT		 3031 if (!task)
3032 goto out;
3033
444ceed8 3034 result = proc_pid_instantiate(dir, dentry, task, NULL);
1da177e4 3035 put_task_struct(task);
1da177e4 3036out:
cd6a3ce9 3037 return result;
1da177e4
LT		 3038}
3039
1da177e4 3040/*
0804ef4b 3041 * Find the first task with tgid >= tgid
0bc58a91 3042 *
1da177e4 3043 */
19fd4bb2
EB		 3044struct tgid_iter {
3045 unsigned int tgid;
0804ef4b 3046 struct task_struct *task;
19fd4bb2
EB		 3047};
3048static struct tgid_iter next_tgid(struct pid_namespace *ns, struct tgid_iter iter)
3049{
0804ef4b 3050 struct pid *pid;
1da177e4 3051
19fd4bb2
EB		 3052 if (iter.task)
3053 put_task_struct(iter.task);
454cc105 3054 rcu_read_lock();
0804ef4b 3055retry:
19fd4bb2
EB		 3056 iter.task = NULL;
3057 pid = find_ge_pid(iter.tgid, ns);
0804ef4b 3058 if (pid) {
19fd4bb2
EB		 3059 iter.tgid = pid_nr_ns(pid, ns);
3060 iter.task = pid_task(pid, PIDTYPE_PID);
0804ef4b
EB		 3061 /* What we to know is if the pid we have find is the
3062 * pid of a thread_group_leader. Testing for task
3063 * being a thread_group_leader is the obvious thing
3064 * todo but there is a window when it fails, due to
3065 * the pid transfer logic in de_thread.
3066 *
3067 * So we perform the straight forward test of seeing
3068 * if the pid we have found is the pid of a thread
3069 * group leader, and don't worry if the task we have
3070 * found doesn't happen to be a thread group leader.
3071 * As we don't care in the case of readdir.
3072 */
19fd4bb2
EB		 3073 if (!iter.task || !has_group_leader_pid(iter.task)) {
3074 iter.tgid += 1;
0804ef4b 3075 goto retry;
19fd4bb2
EB		 3076 }
3077 get_task_struct(iter.task);
0bc58a91 3078 }
454cc105 3079 rcu_read_unlock();
19fd4bb2 3080 return iter;
1da177e4
LT		 3081}
3082
7bcd6b0e 3083#define TGID_OFFSET (FIRST_PROCESS_ENTRY + ARRAY_SIZE(proc_base_stuff))
0804ef4b 3084
61a28784 3085static int proc_pid_fill_cache(struct file *filp, void *dirent, filldir_t filldir,
19fd4bb2 3086 struct tgid_iter iter)
61a28784
EB		 3087{
3088 char name[PROC_NUMBUF];
19fd4bb2 3089 int len = snprintf(name, sizeof(name), "%d", iter.tgid);
61a28784 3090 return proc_fill_cache(filp, dirent, filldir, name, len,
19fd4bb2 3091 proc_pid_instantiate, iter.task, NULL);
61a28784
EB		 3092}
3093
1da177e4
LT		 3094/* for the /proc/ directory itself, after non-process stuff has been done */
3095int proc_pid_readdir(struct file * filp, void * dirent, filldir_t filldir)
3096{
d8bdc59f
LT		 3097 unsigned int nr;
3098 struct task_struct *reaper;
19fd4bb2 3099 struct tgid_iter iter;
b488893a 3100 struct pid_namespace *ns;
1da177e4 3101
d8bdc59f
LT		 3102 if (filp->f_pos >= PID_MAX_LIMIT + TGID_OFFSET)
3103 goto out_no_task;
3104 nr = filp->f_pos - FIRST_PROCESS_ENTRY;
3105
3106 reaper = get_proc_task(filp->f_path.dentry->d_inode);
61a28784
EB		 3107 if (!reaper)
3108 goto out_no_task;
3109
7bcd6b0e 3110 for (; nr < ARRAY_SIZE(proc_base_stuff); filp->f_pos++, nr++) {
c5141e6d 3111 const struct pid_entry *p = &proc_base_stuff[nr];
61a28784 3112 if (proc_base_fill_cache(filp, dirent, filldir, reaper, p) < 0)
801199ce 3113 goto out;
1da177e4
LT		 3114 }
3115
b488893a 3116 ns = filp->f_dentry->d_sb->s_fs_info;
19fd4bb2
EB		 3117 iter.task = NULL;
3118 iter.tgid = filp->f_pos - TGID_OFFSET;
3119 for (iter = next_tgid(ns, iter);
3120 iter.task;
3121 iter.tgid += 1, iter = next_tgid(ns, iter)) {
3122 filp->f_pos = iter.tgid + TGID_OFFSET;
3123 if (proc_pid_fill_cache(filp, dirent, filldir, iter) < 0) {
3124 put_task_struct(iter.task);
0804ef4b 3125 goto out;
1da177e4 3126 }
0bc58a91 3127 }
0804ef4b
EB		 3128 filp->f_pos = PID_MAX_LIMIT + TGID_OFFSET;
3129out:
61a28784
EB		 3130 put_task_struct(reaper);
3131out_no_task:
0bc58a91
EB		 3132 return 0;
3133}
1da177e4 3134
28a6d671
EB		 3135/*
3136 * Tasks
3137 */
c5141e6d 3138static const struct pid_entry tid_base_stuff[] = {
631f9c18 3139 DIR("fd", S_IRUSR|S_IXUSR, proc_fd_inode_operations, proc_fd_operations),
3835541d 3140 DIR("fdinfo", S_IRUSR|S_IXUSR, proc_fdinfo_inode_operations, proc_fdinfo_operations),
6b4e306a 3141 DIR("ns", S_IRUSR|S_IXUGO, proc_ns_dir_inode_operations, proc_ns_dir_operations),
631f9c18
AD		 3142 REG("environ", S_IRUSR, proc_environ_operations),
3143 INF("auxv", S_IRUSR, proc_pid_auxv),
3144 ONE("status", S_IRUGO, proc_pid_status),
a9712bc1 3145 ONE("personality", S_IRUGO, proc_pid_personality),
3036e7b4 3146 INF("limits", S_IRUGO, proc_pid_limits),
43ae34cb 3147#ifdef CONFIG_SCHED_DEBUG
631f9c18 3148 REG("sched", S_IRUGO|S_IWUSR, proc_pid_sched_operations),
ebcb6734 3149#endif
4614a696 3150 REG("comm", S_IRUGO|S_IWUSR, proc_pid_set_comm_operations),
ebcb6734 3151#ifdef CONFIG_HAVE_ARCH_TRACEHOOK
a9712bc1 3152 INF("syscall", S_IRUGO, proc_pid_syscall),
43ae34cb 3153#endif
631f9c18
AD		 3154 INF("cmdline", S_IRUGO, proc_pid_cmdline),
3155 ONE("stat", S_IRUGO, proc_tid_stat),
3156 ONE("statm", S_IRUGO, proc_pid_statm),
3157 REG("maps", S_IRUGO, proc_maps_operations),
28a6d671 3158#ifdef CONFIG_NUMA
631f9c18 3159 REG("numa_maps", S_IRUGO, proc_numa_maps_operations),
28a6d671 3160#endif
631f9c18
AD		 3161 REG("mem", S_IRUSR|S_IWUSR, proc_mem_operations),
3162 LNK("cwd", proc_cwd_link),
3163 LNK("root", proc_root_link),
3164 LNK("exe", proc_exe_link),
3165 REG("mounts", S_IRUGO, proc_mounts_operations),
3166 REG("mountinfo", S_IRUGO, proc_mountinfo_operations),
1e883281 3167#ifdef CONFIG_PROC_PAGE_MONITOR
631f9c18
AD		 3168 REG("clear_refs", S_IWUSR, proc_clear_refs_operations),
3169 REG("smaps", S_IRUGO, proc_smaps_operations),
ca6b0bf0 3170 REG("pagemap", S_IRUGO, proc_pagemap_operations),
28a6d671
EB		 3171#endif
3172#ifdef CONFIG_SECURITY
631f9c18 3173 DIR("attr", S_IRUGO|S_IXUGO, proc_attr_dir_inode_operations, proc_attr_dir_operations),
28a6d671
EB		 3174#endif
3175#ifdef CONFIG_KALLSYMS
631f9c18 3176 INF("wchan", S_IRUGO, proc_pid_wchan),
28a6d671 3177#endif
2ec220e2 3178#ifdef CONFIG_STACKTRACE
a9712bc1 3179 ONE("stack", S_IRUGO, proc_pid_stack),
28a6d671
EB		 3180#endif
3181#ifdef CONFIG_SCHEDSTATS
631f9c18 3182 INF("schedstat", S_IRUGO, proc_pid_schedstat),
28a6d671 3183#endif
9745512c 3184#ifdef CONFIG_LATENCYTOP
631f9c18 3185 REG("latency", S_IRUGO, proc_lstats_operations),
9745512c 3186#endif
8793d854 3187#ifdef CONFIG_PROC_PID_CPUSET
631f9c18 3188 REG("cpuset", S_IRUGO, proc_cpuset_operations),
a424316c
PM		 3189#endif
3190#ifdef CONFIG_CGROUPS
631f9c18 3191 REG("cgroup", S_IRUGO, proc_cgroup_operations),
28a6d671 3192#endif
631f9c18
AD		 3193 INF("oom_score", S_IRUGO, proc_oom_score),
3194 REG("oom_adj", S_IRUGO|S_IWUSR, proc_oom_adjust_operations),
a63d83f4 3195 REG("oom_score_adj", S_IRUGO|S_IWUSR, proc_oom_score_adj_operations),
28a6d671 3196#ifdef CONFIG_AUDITSYSCALL
631f9c18 3197 REG("loginuid", S_IWUSR|S_IRUGO, proc_loginuid_operations),
26ec3c64 3198 REG("sessionid", S_IRUGO, proc_sessionid_operations),
28a6d671 3199#endif
f4f154fd 3200#ifdef CONFIG_FAULT_INJECTION
631f9c18 3201 REG("make-it-fail", S_IRUGO|S_IWUSR, proc_fault_inject_operations),
f4f154fd 3202#endif
297c5d92 3203#ifdef CONFIG_TASK_IO_ACCOUNTING
1d1221f3 3204 INF("io", S_IRUSR, proc_tid_io_accounting),
297c5d92 3205#endif
f133ecca
CM		 3206#ifdef CONFIG_HARDWALL
3207 INF("hardwall", S_IRUGO, proc_pid_hardwall),
3208#endif
28a6d671
EB		 3209};
3210
3211static int proc_tid_base_readdir(struct file * filp,
3212 void * dirent, filldir_t filldir)
3213{
3214 return proc_pident_readdir(filp,dirent,filldir,
3215 tid_base_stuff,ARRAY_SIZE(tid_base_stuff));
3216}
3217
3218static struct dentry *proc_tid_base_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd){
7bcd6b0e
EB		 3219 return proc_pident_lookup(dir, dentry,
3220 tid_base_stuff, ARRAY_SIZE(tid_base_stuff));
28a6d671
EB		 3221}
3222
00977a59 3223static const struct file_operations proc_tid_base_operations = {
28a6d671
EB		 3224 .read = generic_read_dir,
3225 .readdir = proc_tid_base_readdir,
6038f373 3226 .llseek = default_llseek,
28a6d671
EB		 3227};
3228
c5ef1c42 3229static const struct inode_operations proc_tid_base_inode_operations = {
28a6d671
EB		 3230 .lookup = proc_tid_base_lookup,
3231 .getattr = pid_getattr,
3232 .setattr = proc_setattr,
3233};
3234
444ceed8 3235static struct dentry *proc_task_instantiate(struct inode *dir,
c5141e6d 3236 struct dentry *dentry, struct task_struct *task, const void *ptr)
444ceed8
EB		 3237{
3238 struct dentry *error = ERR_PTR(-ENOENT);
3239 struct inode *inode;
61a28784 3240 inode = proc_pid_make_inode(dir->i_sb, task);
444ceed8
EB		 3241
3242 if (!inode)
3243 goto out;
3244 inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO;
3245 inode->i_op = &proc_tid_base_inode_operations;
3246 inode->i_fop = &proc_tid_base_operations;
3247 inode->i_flags|=S_IMMUTABLE;
aed54175
VN		 3248
3249 inode->i_nlink = 2 + pid_entry_count_dirs(tid_base_stuff,
3250 ARRAY_SIZE(tid_base_stuff));
444ceed8 3251
fb045adb 3252 d_set_d_op(dentry, &pid_dentry_operations);
444ceed8
EB		 3253
3254 d_add(dentry, inode);
3255 /* Close the race of the process dying before we return the dentry */
3256 if (pid_revalidate(dentry, NULL))
3257 error = NULL;
3258out:
3259 return error;
3260}
3261
28a6d671
EB		 3262static struct dentry *proc_task_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd)
3263{
3264 struct dentry *result = ERR_PTR(-ENOENT);
3265 struct task_struct *task;
3266 struct task_struct *leader = get_proc_task(dir);
28a6d671 3267 unsigned tid;
b488893a 3268 struct pid_namespace *ns;
28a6d671
EB		 3269
3270 if (!leader)
3271 goto out_no_task;
3272
3273 tid = name_to_int(dentry);
3274 if (tid == ~0U)
3275 goto out;
3276
b488893a 3277 ns = dentry->d_sb->s_fs_info;
28a6d671 3278 rcu_read_lock();
b488893a 3279 task = find_task_by_pid_ns(tid, ns);
28a6d671
EB		 3280 if (task)
3281 get_task_struct(task);
3282 rcu_read_unlock();
3283 if (!task)
3284 goto out;
bac0abd6 3285 if (!same_thread_group(leader, task))
28a6d671
EB		 3286 goto out_drop_task;
3287
444ceed8 3288 result = proc_task_instantiate(dir, dentry, task, NULL);
28a6d671
EB		 3289out_drop_task:
3290 put_task_struct(task);
3291out:
3292 put_task_struct(leader);
3293out_no_task:
3294 return result;
3295}
3296
0bc58a91
EB		 3297/*
3298 * Find the first tid of a thread group to return to user space.
3299 *
3300 * Usually this is just the thread group leader, but if the users
3301 * buffer was too small or there was a seek into the middle of the
3302 * directory we have more work todo.
3303 *
3304 * In the case of a short read we start with find_task_by_pid.
3305 *
3306 * In the case of a seek we start with the leader and walk nr
3307 * threads past it.
3308 */
cc288738 3309static struct task_struct *first_tid(struct task_struct *leader,
b488893a 3310 int tid, int nr, struct pid_namespace *ns)
0bc58a91 3311{
a872ff0c 3312 struct task_struct *pos;
1da177e4 3313
cc288738 3314 rcu_read_lock();
0bc58a91
EB		 3315 /* Attempt to start with the pid of a thread */
3316 if (tid && (nr > 0)) {
b488893a 3317 pos = find_task_by_pid_ns(tid, ns);
a872ff0c
ON		 3318 if (pos && (pos->group_leader == leader))
3319 goto found;
0bc58a91 3320 }
1da177e4 3321
0bc58a91 3322 /* If nr exceeds the number of threads there is nothing todo */
a872ff0c
ON		 3323 pos = NULL;
3324 if (nr && nr >= get_nr_threads(leader))
3325 goto out;
1da177e4 3326
a872ff0c
ON		 3327 /* If we haven't found our starting place yet start
3328 * with the leader and walk nr threads forward.
0bc58a91 3329 */
a872ff0c
ON		 3330 for (pos = leader; nr > 0; --nr) {
3331 pos = next_thread(pos);
3332 if (pos == leader) {
3333 pos = NULL;
3334 goto out;
3335 }
1da177e4 3336 }
a872ff0c
ON		 3337found:
3338 get_task_struct(pos);
3339out:
cc288738 3340 rcu_read_unlock();
0bc58a91
EB		 3341 return pos;
3342}
3343
3344/*
3345 * Find the next thread in the thread list.
3346 * Return NULL if there is an error or no next thread.
3347 *
3348 * The reference to the input task_struct is released.
3349 */
3350static struct task_struct *next_tid(struct task_struct *start)
3351{
c1df7fb8 3352 struct task_struct *pos = NULL;
cc288738 3353 rcu_read_lock();
c1df7fb8 3354 if (pid_alive(start)) {
0bc58a91 3355 pos = next_thread(start);
c1df7fb8
ON		 3356 if (thread_group_leader(pos))
3357 pos = NULL;
3358 else
3359 get_task_struct(pos);
3360 }
cc288738 3361 rcu_read_unlock();
0bc58a91
EB		 3362 put_task_struct(start);
3363 return pos;
1da177e4
LT		 3364}
3365
61a28784
EB		 3366static int proc_task_fill_cache(struct file *filp, void *dirent, filldir_t filldir,
3367 struct task_struct *task, int tid)
3368{
3369 char name[PROC_NUMBUF];
3370 int len = snprintf(name, sizeof(name), "%d", tid);
3371 return proc_fill_cache(filp, dirent, filldir, name, len,
3372 proc_task_instantiate, task, NULL);
3373}
3374
1da177e4
LT		 3375/* for the /proc/TGID/task/ directories */
3376static int proc_task_readdir(struct file * filp, void * dirent, filldir_t filldir)
3377{
2fddfeef 3378 struct dentry *dentry = filp->f_path.dentry;
1da177e4 3379 struct inode *inode = dentry->d_inode;
7d895244 3380 struct task_struct *leader = NULL;
0bc58a91 3381 struct task_struct *task;
1da177e4
LT		 3382 int retval = -ENOENT;
3383 ino_t ino;
0bc58a91 3384 int tid;
b488893a 3385 struct pid_namespace *ns;
1da177e4 3386
7d895244
GC		 3387 task = get_proc_task(inode);
3388 if (!task)
3389 goto out_no_task;
3390 rcu_read_lock();
3391 if (pid_alive(task)) {
3392 leader = task->group_leader;
3393 get_task_struct(leader);
3394 }
3395 rcu_read_unlock();
3396 put_task_struct(task);
99f89551
EB		 3397 if (!leader)
3398 goto out_no_task;
1da177e4
LT		 3399 retval = 0;
3400
ee568b25 3401 switch ((unsigned long)filp->f_pos) {
1da177e4
LT		 3402 case 0:
3403 ino = inode->i_ino;
ee6f779b 3404 if (filldir(dirent, ".", 1, filp->f_pos, ino, DT_DIR) < 0)
1da177e4 3405 goto out;
ee6f779b 3406 filp->f_pos++;
1da177e4
LT		 3407 /* fall through */
3408 case 1:
3409 ino = parent_ino(dentry);
ee6f779b 3410 if (filldir(dirent, "..", 2, filp->f_pos, ino, DT_DIR) < 0)
1da177e4 3411 goto out;
ee6f779b 3412 filp->f_pos++;
1da177e4
LT		 3413 /* fall through */
3414 }
3415
0bc58a91
EB		 3416 /* f_version caches the tgid value that the last readdir call couldn't
3417 * return. lseek aka telldir automagically resets f_version to 0.
3418 */
b488893a 3419 ns = filp->f_dentry->d_sb->s_fs_info;
2b47c361 3420 tid = (int)filp->f_version;
0bc58a91 3421 filp->f_version = 0;
ee6f779b 3422 for (task = first_tid(leader, tid, filp->f_pos - 2, ns);
0bc58a91 3423 task;
ee6f779b 3424 task = next_tid(task), filp->f_pos++) {
b488893a 3425 tid = task_pid_nr_ns(task, ns);
61a28784 3426 if (proc_task_fill_cache(filp, dirent, filldir, task, tid) < 0) {
0bc58a91
EB		 3427 /* returning this tgid failed, save it as the first
3428 * pid for the next readir call */
2b47c361 3429 filp->f_version = (u64)tid;
0bc58a91 3430 put_task_struct(task);
1da177e4 3431 break;
0bc58a91 3432 }
1da177e4
LT		 3433 }
3434out:
99f89551
EB		 3435 put_task_struct(leader);
3436out_no_task:
1da177e4
LT		 3437 return retval;
3438}
6e66b52b
EB		 3439
3440static int proc_task_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
3441{
3442 struct inode *inode = dentry->d_inode;
99f89551 3443 struct task_struct *p = get_proc_task(inode);
6e66b52b
EB		 3444 generic_fillattr(inode, stat);
3445
99f89551 3446 if (p) {
99f89551 3447 stat->nlink += get_nr_threads(p);
99f89551 3448 put_task_struct(p);
6e66b52b
EB		 3449 }
3450
3451 return 0;
3452}
28a6d671 3453
c5ef1c42 3454static const struct inode_operations proc_task_inode_operations = {
28a6d671
EB		 3455 .lookup = proc_task_lookup,
3456 .getattr = proc_task_getattr,
3457 .setattr = proc_setattr,
3458};
3459
00977a59 3460static const struct file_operations proc_task_operations = {
28a6d671
EB		 3461 .read = generic_read_dir,
3462 .readdir = proc_task_readdir,
6038f373 3463 .llseek = default_llseek,
28a6d671 3464};
Linux kernel - Deliverables
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