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Linux 3.0-rc5
[GitHub/mt8127/android_kernel_alcatel_ttab.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();
219 match = (tracehook_tracer_task(task) == current);
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;
676 p->event = ns->event;
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 */
1121 printk_once(KERN_WARNING "%s (%d): /proc/%d/oom_adj is deprecated, "
1122 "please use /proc/%d/oom_score_adj instead.\n",
1123 current->comm, task_pid_nr(current),
1124 task_pid_nr(task), task_pid_nr(task));
28b83c51 1125 task->signal->oom_adj = oom_adjust;
a63d83f4
DR		 1126 /*
1127 * Scale /proc/pid/oom_score_adj appropriately ensuring that a maximum
1128 * value is always attainable.
1129 */
1130 if (task->signal->oom_adj == OOM_ADJUST_MAX)
1131 task->signal->oom_score_adj = OOM_SCORE_ADJ_MAX;
1132 else
1133 task->signal->oom_score_adj = (oom_adjust * OOM_SCORE_ADJ_MAX) /
1134 -OOM_DISABLE;
723548bf 1135err_sighand:
28b83c51 1136 unlock_task_sighand(task, &flags);
d19d5476
DR		 1137err_task_lock:
1138 task_unlock(task);
99f89551 1139 put_task_struct(task);
723548bf
DR		 1140out:
1141 return err < 0 ? err : count;
1da177e4
LT		 1142}
1143
00977a59 1144static const struct file_operations proc_oom_adjust_operations = {
1da177e4
LT		 1145 .read = oom_adjust_read,
1146 .write = oom_adjust_write,
87df8424 1147 .llseek = generic_file_llseek,
1da177e4
LT		 1148};
1149
a63d83f4
DR		 1150static ssize_t oom_score_adj_read(struct file *file, char __user *buf,
1151 size_t count, loff_t *ppos)
1152{
1153 struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode);
1154 char buffer[PROC_NUMBUF];
1155 int oom_score_adj = OOM_SCORE_ADJ_MIN;
1156 unsigned long flags;
1157 size_t len;
1158
1159 if (!task)
1160 return -ESRCH;
1161 if (lock_task_sighand(task, &flags)) {
1162 oom_score_adj = task->signal->oom_score_adj;
1163 unlock_task_sighand(task, &flags);
1164 }
1165 put_task_struct(task);
1166 len = snprintf(buffer, sizeof(buffer), "%d\n", oom_score_adj);
1167 return simple_read_from_buffer(buf, count, ppos, buffer, len);
1168}
1169
1170static ssize_t oom_score_adj_write(struct file *file, const char __user *buf,
1171 size_t count, loff_t *ppos)
1172{
1173 struct task_struct *task;
1174 char buffer[PROC_NUMBUF];
1175 unsigned long flags;
0a8cb8e3 1176 int oom_score_adj;
a63d83f4
DR		 1177 int err;
1178
1179 memset(buffer, 0, sizeof(buffer));
1180 if (count > sizeof(buffer) - 1)
1181 count = sizeof(buffer) - 1;
723548bf
DR		 1182 if (copy_from_user(buffer, buf, count)) {
1183 err = -EFAULT;
1184 goto out;
1185 }
a63d83f4 1186
0a8cb8e3 1187 err = kstrtoint(strstrip(buffer), 0, &oom_score_adj);
a63d83f4 1188 if (err)
723548bf 1189 goto out;
a63d83f4 1190 if (oom_score_adj < OOM_SCORE_ADJ_MIN ||
723548bf
DR		 1191 oom_score_adj > OOM_SCORE_ADJ_MAX) {
1192 err = -EINVAL;
1193 goto out;
1194 }
a63d83f4
DR		 1195
1196 task = get_proc_task(file->f_path.dentry->d_inode);
723548bf
DR		 1197 if (!task) {
1198 err = -ESRCH;
1199 goto out;
1200 }
d19d5476
DR		 1201
1202 task_lock(task);
1203 if (!task->mm) {
1204 err = -EINVAL;
1205 goto err_task_lock;
1206 }
1207
a63d83f4 1208 if (!lock_task_sighand(task, &flags)) {
723548bf 1209 err = -ESRCH;
d19d5476 1210 goto err_task_lock;
a63d83f4 1211 }
d19d5476 1212
dabb16f6 1213 if (oom_score_adj < task->signal->oom_score_adj_min &&
a63d83f4 1214 !capable(CAP_SYS_RESOURCE)) {
723548bf
DR		 1215 err = -EACCES;
1216 goto err_sighand;
a63d83f4
DR		 1217 }
1218
3d5992d2
YH		 1219 if (oom_score_adj != task->signal->oom_score_adj) {
1220 if (oom_score_adj == OOM_SCORE_ADJ_MIN)
1221 atomic_inc(&task->mm->oom_disable_count);
1222 if (task->signal->oom_score_adj == OOM_SCORE_ADJ_MIN)
1223 atomic_dec(&task->mm->oom_disable_count);
1224 }
a63d83f4 1225 task->signal->oom_score_adj = oom_score_adj;
dabb16f6
MSB		 1226 if (has_capability_noaudit(current, CAP_SYS_RESOURCE))
1227 task->signal->oom_score_adj_min = oom_score_adj;
a63d83f4
DR		 1228 /*
1229 * Scale /proc/pid/oom_adj appropriately ensuring that OOM_DISABLE is
1230 * always attainable.
1231 */
1232 if (task->signal->oom_score_adj == OOM_SCORE_ADJ_MIN)
1233 task->signal->oom_adj = OOM_DISABLE;
1234 else
1235 task->signal->oom_adj = (oom_score_adj * OOM_ADJUST_MAX) /
1236 OOM_SCORE_ADJ_MAX;
723548bf 1237err_sighand:
a63d83f4 1238 unlock_task_sighand(task, &flags);
d19d5476
DR		 1239err_task_lock:
1240 task_unlock(task);
a63d83f4 1241 put_task_struct(task);
723548bf
DR		 1242out:
1243 return err < 0 ? err : count;
a63d83f4
DR		 1244}
1245
1246static const struct file_operations proc_oom_score_adj_operations = {
1247 .read = oom_score_adj_read,
1248 .write = oom_score_adj_write,
6038f373 1249 .llseek = default_llseek,
a63d83f4
DR		 1250};
1251
1da177e4
LT		 1252#ifdef CONFIG_AUDITSYSCALL
1253#define TMPBUFLEN 21
1254static ssize_t proc_loginuid_read(struct file * file, char __user * buf,
1255 size_t count, loff_t *ppos)
1256{
2fddfeef 1257 struct inode * inode = file->f_path.dentry->d_inode;
99f89551 1258 struct task_struct *task = get_proc_task(inode);
1da177e4
LT		 1259 ssize_t length;
1260 char tmpbuf[TMPBUFLEN];
1261
99f89551
EB		 1262 if (!task)
1263 return -ESRCH;
1da177e4 1264 length = scnprintf(tmpbuf, TMPBUFLEN, "%u",
0c11b942 1265 audit_get_loginuid(task));
99f89551 1266 put_task_struct(task);
1da177e4
LT		 1267 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1268}
1269
1270static ssize_t proc_loginuid_write(struct file * file, const char __user * buf,
1271 size_t count, loff_t *ppos)
1272{
2fddfeef 1273 struct inode * inode = file->f_path.dentry->d_inode;
1da177e4
LT		 1274 char *page, *tmp;
1275 ssize_t length;
1da177e4
LT		 1276 uid_t loginuid;
1277
1278 if (!capable(CAP_AUDIT_CONTROL))
1279 return -EPERM;
1280
7dc52157
PM		 1281 rcu_read_lock();
1282 if (current != pid_task(proc_pid(inode), PIDTYPE_PID)) {
1283 rcu_read_unlock();
1da177e4 1284 return -EPERM;
7dc52157
PM		 1285 }
1286 rcu_read_unlock();
1da177e4 1287
e0182909
AV		 1288 if (count >= PAGE_SIZE)
1289 count = PAGE_SIZE - 1;
1da177e4
LT		 1290
1291 if (*ppos != 0) {
1292 /* No partial writes. */
1293 return -EINVAL;
1294 }
e12ba74d 1295 page = (char*)__get_free_page(GFP_TEMPORARY);
1da177e4
LT		 1296 if (!page)
1297 return -ENOMEM;
1298 length = -EFAULT;
1299 if (copy_from_user(page, buf, count))
1300 goto out_free_page;
1301
e0182909 1302 page[count] = '\0';
1da177e4
LT		 1303 loginuid = simple_strtoul(page, &tmp, 10);
1304 if (tmp == page) {
1305 length = -EINVAL;
1306 goto out_free_page;
1307
1308 }
99f89551 1309 length = audit_set_loginuid(current, loginuid);
1da177e4
LT		 1310 if (likely(length == 0))
1311 length = count;
1312
1313out_free_page:
1314 free_page((unsigned long) page);
1315 return length;
1316}
1317
00977a59 1318static const struct file_operations proc_loginuid_operations = {
1da177e4
LT		 1319 .read = proc_loginuid_read,
1320 .write = proc_loginuid_write,
87df8424 1321 .llseek = generic_file_llseek,
1da177e4 1322};
1e0bd755
EP		 1323
1324static ssize_t proc_sessionid_read(struct file * file, char __user * buf,
1325 size_t count, loff_t *ppos)
1326{
1327 struct inode * inode = file->f_path.dentry->d_inode;
1328 struct task_struct *task = get_proc_task(inode);
1329 ssize_t length;
1330 char tmpbuf[TMPBUFLEN];
1331
1332 if (!task)
1333 return -ESRCH;
1334 length = scnprintf(tmpbuf, TMPBUFLEN, "%u",
1335 audit_get_sessionid(task));
1336 put_task_struct(task);
1337 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1338}
1339
1340static const struct file_operations proc_sessionid_operations = {
1341 .read = proc_sessionid_read,
87df8424 1342 .llseek = generic_file_llseek,
1e0bd755 1343};
1da177e4
LT		 1344#endif
1345
f4f154fd
AM		 1346#ifdef CONFIG_FAULT_INJECTION
1347static ssize_t proc_fault_inject_read(struct file * file, char __user * buf,
1348 size_t count, loff_t *ppos)
1349{
1350 struct task_struct *task = get_proc_task(file->f_dentry->d_inode);
1351 char buffer[PROC_NUMBUF];
1352 size_t len;
1353 int make_it_fail;
f4f154fd
AM		 1354
1355 if (!task)
1356 return -ESRCH;
1357 make_it_fail = task->make_it_fail;
1358 put_task_struct(task);
1359
1360 len = snprintf(buffer, sizeof(buffer), "%i\n", make_it_fail);
0c28f287
AM		 1361
1362 return simple_read_from_buffer(buf, count, ppos, buffer, len);
f4f154fd
AM		 1363}
1364
1365static ssize_t proc_fault_inject_write(struct file * file,
1366 const char __user * buf, size_t count, loff_t *ppos)
1367{
1368 struct task_struct *task;
1369 char buffer[PROC_NUMBUF], *end;
1370 int make_it_fail;
1371
1372 if (!capable(CAP_SYS_RESOURCE))
1373 return -EPERM;
1374 memset(buffer, 0, sizeof(buffer));
1375 if (count > sizeof(buffer) - 1)
1376 count = sizeof(buffer) - 1;
1377 if (copy_from_user(buffer, buf, count))
1378 return -EFAULT;
cba8aafe
VL		 1379 make_it_fail = simple_strtol(strstrip(buffer), &end, 0);
1380 if (*end)
1381 return -EINVAL;
f4f154fd
AM		 1382 task = get_proc_task(file->f_dentry->d_inode);
1383 if (!task)
1384 return -ESRCH;
1385 task->make_it_fail = make_it_fail;
1386 put_task_struct(task);
cba8aafe
VL		 1387
1388 return count;
f4f154fd
AM		 1389}
1390
00977a59 1391static const struct file_operations proc_fault_inject_operations = {
f4f154fd
AM		 1392 .read = proc_fault_inject_read,
1393 .write = proc_fault_inject_write,
87df8424 1394 .llseek = generic_file_llseek,
f4f154fd
AM		 1395};
1396#endif
1397
9745512c 1398
43ae34cb
IM		 1399#ifdef CONFIG_SCHED_DEBUG
1400/*
1401 * Print out various scheduling related per-task fields:
1402 */
1403static int sched_show(struct seq_file *m, void *v)
1404{
1405 struct inode *inode = m->private;
1406 struct task_struct *p;
1407
43ae34cb
IM		 1408 p = get_proc_task(inode);
1409 if (!p)
1410 return -ESRCH;
1411 proc_sched_show_task(p, m);
1412
1413 put_task_struct(p);
1414
1415 return 0;
1416}
1417
1418static ssize_t
1419sched_write(struct file *file, const char __user *buf,
1420 size_t count, loff_t *offset)
1421{
1422 struct inode *inode = file->f_path.dentry->d_inode;
1423 struct task_struct *p;
1424
43ae34cb
IM		 1425 p = get_proc_task(inode);
1426 if (!p)
1427 return -ESRCH;
1428 proc_sched_set_task(p);
1429
1430 put_task_struct(p);
1431
1432 return count;
1433}
1434
1435static int sched_open(struct inode *inode, struct file *filp)
1436{
c6a34058 1437 return single_open(filp, sched_show, inode);
43ae34cb
IM		 1438}
1439
1440static const struct file_operations proc_pid_sched_operations = {
1441 .open = sched_open,
1442 .read = seq_read,
1443 .write = sched_write,
1444 .llseek = seq_lseek,
5ea473a1 1445 .release = single_release,
43ae34cb
IM		 1446};
1447
1448#endif
1449
5091faa4
MG		 1450#ifdef CONFIG_SCHED_AUTOGROUP
1451/*
1452 * Print out autogroup related information:
1453 */
1454static int sched_autogroup_show(struct seq_file *m, void *v)
1455{
1456 struct inode *inode = m->private;
1457 struct task_struct *p;
1458
1459 p = get_proc_task(inode);
1460 if (!p)
1461 return -ESRCH;
1462 proc_sched_autogroup_show_task(p, m);
1463
1464 put_task_struct(p);
1465
1466 return 0;
1467}
1468
1469static ssize_t
1470sched_autogroup_write(struct file *file, const char __user *buf,
1471 size_t count, loff_t *offset)
1472{
1473 struct inode *inode = file->f_path.dentry->d_inode;
1474 struct task_struct *p;
1475 char buffer[PROC_NUMBUF];
0a8cb8e3 1476 int nice;
5091faa4
MG		 1477 int err;
1478
1479 memset(buffer, 0, sizeof(buffer));
1480 if (count > sizeof(buffer) - 1)
1481 count = sizeof(buffer) - 1;
1482 if (copy_from_user(buffer, buf, count))
1483 return -EFAULT;
1484
0a8cb8e3
AD		 1485 err = kstrtoint(strstrip(buffer), 0, &nice);
1486 if (err < 0)
1487 return err;
5091faa4
MG		 1488
1489 p = get_proc_task(inode);
1490 if (!p)
1491 return -ESRCH;
1492
1493 err = nice;
1494 err = proc_sched_autogroup_set_nice(p, &err);
1495 if (err)
1496 count = err;
1497
1498 put_task_struct(p);
1499
1500 return count;
1501}
1502
1503static int sched_autogroup_open(struct inode *inode, struct file *filp)
1504{
1505 int ret;
1506
1507 ret = single_open(filp, sched_autogroup_show, NULL);
1508 if (!ret) {
1509 struct seq_file *m = filp->private_data;
1510
1511 m->private = inode;
1512 }
1513 return ret;
1514}
1515
1516static const struct file_operations proc_pid_sched_autogroup_operations = {
1517 .open = sched_autogroup_open,
1518 .read = seq_read,
1519 .write = sched_autogroup_write,
1520 .llseek = seq_lseek,
1521 .release = single_release,
1522};
1523
1524#endif /* CONFIG_SCHED_AUTOGROUP */
1525
4614a696
JS		 1526static ssize_t comm_write(struct file *file, const char __user *buf,
1527 size_t count, loff_t *offset)
1528{
1529 struct inode *inode = file->f_path.dentry->d_inode;
1530 struct task_struct *p;
1531 char buffer[TASK_COMM_LEN];
1532
1533 memset(buffer, 0, sizeof(buffer));
1534 if (count > sizeof(buffer) - 1)
1535 count = sizeof(buffer) - 1;
1536 if (copy_from_user(buffer, buf, count))
1537 return -EFAULT;
1538
1539 p = get_proc_task(inode);
1540 if (!p)
1541 return -ESRCH;
1542
1543 if (same_thread_group(current, p))
1544 set_task_comm(p, buffer);
1545 else
1546 count = -EINVAL;
1547
1548 put_task_struct(p);
1549
1550 return count;
1551}
1552
1553static int comm_show(struct seq_file *m, void *v)
1554{
1555 struct inode *inode = m->private;
1556 struct task_struct *p;
1557
1558 p = get_proc_task(inode);
1559 if (!p)
1560 return -ESRCH;
1561
1562 task_lock(p);
1563 seq_printf(m, "%s\n", p->comm);
1564 task_unlock(p);
1565
1566 put_task_struct(p);
1567
1568 return 0;
1569}
1570
1571static int comm_open(struct inode *inode, struct file *filp)
1572{
c6a34058 1573 return single_open(filp, comm_show, inode);
4614a696
JS		 1574}
1575
1576static const struct file_operations proc_pid_set_comm_operations = {
1577 .open = comm_open,
1578 .read = seq_read,
1579 .write = comm_write,
1580 .llseek = seq_lseek,
1581 .release = single_release,
1582};
1583
925d1c40
MH		 1584static int proc_exe_link(struct inode *inode, struct path *exe_path)
1585{
1586 struct task_struct *task;
1587 struct mm_struct *mm;
1588 struct file *exe_file;
1589
1590 task = get_proc_task(inode);
1591 if (!task)
1592 return -ENOENT;
1593 mm = get_task_mm(task);
1594 put_task_struct(task);
1595 if (!mm)
1596 return -ENOENT;
1597 exe_file = get_mm_exe_file(mm);
1598 mmput(mm);
1599 if (exe_file) {
1600 *exe_path = exe_file->f_path;
1601 path_get(&exe_file->f_path);
1602 fput(exe_file);
1603 return 0;
1604 } else
1605 return -ENOENT;
1606}
1607
008b150a 1608static void *proc_pid_follow_link(struct dentry *dentry, struct nameidata *nd)
1da177e4
LT		 1609{
1610 struct inode *inode = dentry->d_inode;
1611 int error = -EACCES;
1612
1613 /* We don't need a base pointer in the /proc filesystem */
1d957f9b 1614 path_put(&nd->path);
1da177e4 1615
778c1144
EB		 1616 /* Are we allowed to snoop on the tasks file descriptors? */
1617 if (!proc_fd_access_allowed(inode))
1da177e4 1618 goto out;
1da177e4 1619
3dcd25f3 1620 error = PROC_I(inode)->op.proc_get_link(inode, &nd->path);
1da177e4 1621out:
008b150a 1622 return ERR_PTR(error);
1da177e4
LT		 1623}
1624
3dcd25f3 1625static int do_proc_readlink(struct path *path, char __user *buffer, int buflen)
1da177e4 1626{
e12ba74d 1627 char *tmp = (char*)__get_free_page(GFP_TEMPORARY);
3dcd25f3 1628 char *pathname;
1da177e4
LT		 1629 int len;
1630
1631 if (!tmp)
1632 return -ENOMEM;
0c28f287 1633
7b2a69ba 1634 pathname = d_path(path, tmp, PAGE_SIZE);
3dcd25f3
JB		 1635 len = PTR_ERR(pathname);
1636 if (IS_ERR(pathname))
1da177e4 1637 goto out;
3dcd25f3 1638 len = tmp + PAGE_SIZE - 1 - pathname;
1da177e4
LT		 1639
1640 if (len > buflen)
1641 len = buflen;
3dcd25f3 1642 if (copy_to_user(buffer, pathname, len))
1da177e4
LT		 1643 len = -EFAULT;
1644 out:
1645 free_page((unsigned long)tmp);
1646 return len;
1647}
1648
1649static int proc_pid_readlink(struct dentry * dentry, char __user * buffer, int buflen)
1650{
1651 int error = -EACCES;
1652 struct inode *inode = dentry->d_inode;
3dcd25f3 1653 struct path path;
1da177e4 1654
778c1144
EB		 1655 /* Are we allowed to snoop on the tasks file descriptors? */
1656 if (!proc_fd_access_allowed(inode))
1da177e4 1657 goto out;
1da177e4 1658
3dcd25f3 1659 error = PROC_I(inode)->op.proc_get_link(inode, &path);
1da177e4
LT		 1660 if (error)
1661 goto out;
1662
3dcd25f3
JB		 1663 error = do_proc_readlink(&path, buffer, buflen);
1664 path_put(&path);
1da177e4 1665out:
1da177e4
LT		 1666 return error;
1667}
1668
c5ef1c42 1669static const struct inode_operations proc_pid_link_inode_operations = {
1da177e4 1670 .readlink = proc_pid_readlink,
6d76fa58
LT		 1671 .follow_link = proc_pid_follow_link,
1672 .setattr = proc_setattr,
1da177e4
LT		 1673};
1674
28a6d671
EB		 1675
1676/* building an inode */
1677
1678static int task_dumpable(struct task_struct *task)
1da177e4 1679{
28a6d671
EB		 1680 int dumpable = 0;
1681 struct mm_struct *mm;
1da177e4 1682
28a6d671
EB		 1683 task_lock(task);
1684 mm = task->mm;
1685 if (mm)
6c5d5238 1686 dumpable = get_dumpable(mm);
28a6d671
EB		 1687 task_unlock(task);
1688 if(dumpable == 1)
1689 return 1;
1690 return 0;
1691}
1da177e4 1692
6b4e306a 1693struct inode *proc_pid_make_inode(struct super_block * sb, struct task_struct *task)
28a6d671
EB		 1694{
1695 struct inode * inode;
1696 struct proc_inode *ei;
c69e8d9c 1697 const struct cred *cred;
1da177e4 1698
28a6d671 1699 /* We need a new inode */
1da177e4 1700
28a6d671
EB		 1701 inode = new_inode(sb);
1702 if (!inode)
1703 goto out;
1704
1705 /* Common stuff */
1706 ei = PROC_I(inode);
85fe4025 1707 inode->i_ino = get_next_ino();
28a6d671 1708 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
28a6d671
EB		 1709 inode->i_op = &proc_def_inode_operations;
1710
1711 /*
1712 * grab the reference to task.
1713 */
1a657f78 1714 ei->pid = get_task_pid(task, PIDTYPE_PID);
28a6d671
EB		 1715 if (!ei->pid)
1716 goto out_unlock;
1717
28a6d671 1718 if (task_dumpable(task)) {
c69e8d9c
DH		 1719 rcu_read_lock();
1720 cred = __task_cred(task);
1721 inode->i_uid = cred->euid;
1722 inode->i_gid = cred->egid;
1723 rcu_read_unlock();
1da177e4 1724 }
28a6d671
EB		 1725 security_task_to_inode(task, inode);
1726
1da177e4 1727out:
28a6d671
EB		 1728 return inode;
1729
1730out_unlock:
1731 iput(inode);
1732 return NULL;
1da177e4
LT		 1733}
1734
6b4e306a 1735int pid_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
1da177e4 1736{
1da177e4 1737 struct inode *inode = dentry->d_inode;
28a6d671 1738 struct task_struct *task;
c69e8d9c
DH		 1739 const struct cred *cred;
1740
28a6d671 1741 generic_fillattr(inode, stat);
1da177e4 1742
28a6d671
EB		 1743 rcu_read_lock();
1744 stat->uid = 0;
1745 stat->gid = 0;
1746 task = pid_task(proc_pid(inode), PIDTYPE_PID);
1747 if (task) {
1748 if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) ||
1749 task_dumpable(task)) {
c69e8d9c
DH		 1750 cred = __task_cred(task);
1751 stat->uid = cred->euid;
1752 stat->gid = cred->egid;
1da177e4
LT		 1753 }
1754 }
28a6d671 1755 rcu_read_unlock();
d6e71144 1756 return 0;
1da177e4
LT		 1757}
1758
1da177e4
LT		 1759/* dentry stuff */
1760
1761/*
1762 * Exceptional case: normally we are not allowed to unhash a busy
1763 * directory. In this case, however, we can do it - no aliasing problems
1764 * due to the way we treat inodes.
1765 *
1766 * Rewrite the inode's ownerships here because the owning task may have
1767 * performed a setuid(), etc.
99f89551
EB		 1768 *
1769 * Before the /proc/pid/status file was created the only way to read
1770 * the effective uid of a /process was to stat /proc/pid. Reading
1771 * /proc/pid/status is slow enough that procps and other packages
1772 * kept stating /proc/pid. To keep the rules in /proc simple I have
1773 * made this apply to all per process world readable and executable
1774 * directories.
1da177e4 1775 */
6b4e306a 1776int pid_revalidate(struct dentry *dentry, struct nameidata *nd)
1da177e4 1777{
34286d66
NP		 1778 struct inode *inode;
1779 struct task_struct *task;
c69e8d9c
DH		 1780 const struct cred *cred;
1781
34286d66
NP		 1782 if (nd && nd->flags & LOOKUP_RCU)
1783 return -ECHILD;
1784
1785 inode = dentry->d_inode;
1786 task = get_proc_task(inode);
1787
99f89551
EB		 1788 if (task) {
1789 if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) ||
1790 task_dumpable(task)) {
c69e8d9c
DH		 1791 rcu_read_lock();
1792 cred = __task_cred(task);
1793 inode->i_uid = cred->euid;
1794 inode->i_gid = cred->egid;
1795 rcu_read_unlock();
1da177e4
LT		 1796 } else {
1797 inode->i_uid = 0;
1798 inode->i_gid = 0;
1799 }
9ee8ab9f 1800 inode->i_mode &= ~(S_ISUID | S_ISGID);
1da177e4 1801 security_task_to_inode(task, inode);
99f89551 1802 put_task_struct(task);
1da177e4
LT		 1803 return 1;
1804 }
1805 d_drop(dentry);
1806 return 0;
1807}
1808
fe15ce44 1809static int pid_delete_dentry(const struct dentry * dentry)
99f89551 1810{
28a6d671
EB		 1811 /* Is the task we represent dead?
1812 * If so, then don't put the dentry on the lru list,
1813 * kill it immediately.
1814 */
1815 return !proc_pid(dentry->d_inode)->tasks[PIDTYPE_PID].first;
1816}
1817
6b4e306a 1818const struct dentry_operations pid_dentry_operations =
28a6d671
EB		 1819{
1820 .d_revalidate = pid_revalidate,
1821 .d_delete = pid_delete_dentry,
1822};
1823
1824/* Lookups */
1825
1c0d04c9
EB		 1826/*
1827 * Fill a directory entry.
1828 *
1829 * If possible create the dcache entry and derive our inode number and
1830 * file type from dcache entry.
1831 *
1832 * Since all of the proc inode numbers are dynamically generated, the inode
1833 * numbers do not exist until the inode is cache. This means creating the
1834 * the dcache entry in readdir is necessary to keep the inode numbers
1835 * reported by readdir in sync with the inode numbers reported
1836 * by stat.
1837 */
6b4e306a
EB		 1838int proc_fill_cache(struct file *filp, void *dirent, filldir_t filldir,
1839 const char *name, int len,
c5141e6d 1840 instantiate_t instantiate, struct task_struct *task, const void *ptr)
61a28784 1841{
2fddfeef 1842 struct dentry *child, *dir = filp->f_path.dentry;
61a28784
EB		 1843 struct inode *inode;
1844 struct qstr qname;
1845 ino_t ino = 0;
1846 unsigned type = DT_UNKNOWN;
1847
1848 qname.name = name;
1849 qname.len = len;
1850 qname.hash = full_name_hash(name, len);
1851
1852 child = d_lookup(dir, &qname);
1853 if (!child) {
1854 struct dentry *new;
1855 new = d_alloc(dir, &qname);
1856 if (new) {
1857 child = instantiate(dir->d_inode, new, task, ptr);
1858 if (child)
1859 dput(new);
1860 else
1861 child = new;
1862 }
1863 }
1864 if (!child || IS_ERR(child) || !child->d_inode)
1865 goto end_instantiate;
1866 inode = child->d_inode;
1867 if (inode) {
1868 ino = inode->i_ino;
1869 type = inode->i_mode >> 12;
1870 }
1871 dput(child);
1872end_instantiate:
1873 if (!ino)
1874 ino = find_inode_number(dir, &qname);
1875 if (!ino)
1876 ino = 1;
1877 return filldir(dirent, name, len, filp->f_pos, ino, type);
1878}
1879
28a6d671
EB		 1880static unsigned name_to_int(struct dentry *dentry)
1881{
1882 const char *name = dentry->d_name.name;
1883 int len = dentry->d_name.len;
1884 unsigned n = 0;
1885
1886 if (len > 1 && *name == '0')
1887 goto out;
1888 while (len-- > 0) {
1889 unsigned c = *name++ - '0';
1890 if (c > 9)
1891 goto out;
1892 if (n >= (~0U-9)/10)
1893 goto out;
1894 n *= 10;
1895 n += c;
1896 }
1897 return n;
1898out:
1899 return ~0U;
1900}
1901
27932742
MS		 1902#define PROC_FDINFO_MAX 64
1903
3dcd25f3 1904static int proc_fd_info(struct inode *inode, struct path *path, char *info)
28a6d671
EB		 1905{
1906 struct task_struct *task = get_proc_task(inode);
1907 struct files_struct *files = NULL;
1908 struct file *file;
1909 int fd = proc_fd(inode);
99f89551 1910
99f89551 1911 if (task) {
28a6d671
EB		 1912 files = get_files_struct(task);
1913 put_task_struct(task);
1914 }
1915 if (files) {
1916 /*
1917 * We are not taking a ref to the file structure, so we must
1918 * hold ->file_lock.
1919 */
1920 spin_lock(&files->file_lock);
1921 file = fcheck_files(files, fd);
1922 if (file) {
3dcd25f3
JB		 1923 if (path) {
1924 *path = file->f_path;
1925 path_get(&file->f_path);
1926 }
27932742
MS		 1927 if (info)
1928 snprintf(info, PROC_FDINFO_MAX,
1929 "pos:\t%lli\n"
1930 "flags:\t0%o\n",
1931 (long long) file->f_pos,
1932 file->f_flags);
28a6d671
EB		 1933 spin_unlock(&files->file_lock);
1934 put_files_struct(files);
1935 return 0;
99f89551 1936 }
28a6d671
EB		 1937 spin_unlock(&files->file_lock);
1938 put_files_struct(files);
99f89551 1939 }
28a6d671 1940 return -ENOENT;
99f89551
EB		 1941}
1942
3dcd25f3 1943static int proc_fd_link(struct inode *inode, struct path *path)
27932742 1944{
3dcd25f3 1945 return proc_fd_info(inode, path, NULL);
27932742
MS		 1946}
1947
1da177e4
LT		 1948static int tid_fd_revalidate(struct dentry *dentry, struct nameidata *nd)
1949{
34286d66
NP		 1950 struct inode *inode;
1951 struct task_struct *task;
1952 int fd;
1da177e4 1953 struct files_struct *files;
c69e8d9c 1954 const struct cred *cred;
1da177e4 1955
34286d66
NP		 1956 if (nd && nd->flags & LOOKUP_RCU)
1957 return -ECHILD;
1958
1959 inode = dentry->d_inode;
1960 task = get_proc_task(inode);
1961 fd = proc_fd(inode);
1962
99f89551
EB		 1963 if (task) {
1964 files = get_files_struct(task);
1965 if (files) {
1966 rcu_read_lock();
1967 if (fcheck_files(files, fd)) {
1968 rcu_read_unlock();
1969 put_files_struct(files);
1970 if (task_dumpable(task)) {
c69e8d9c
DH		 1971 rcu_read_lock();
1972 cred = __task_cred(task);
1973 inode->i_uid = cred->euid;
1974 inode->i_gid = cred->egid;
1975 rcu_read_unlock();
99f89551
EB		 1976 } else {
1977 inode->i_uid = 0;
1978 inode->i_gid = 0;
1979 }
9ee8ab9f 1980 inode->i_mode &= ~(S_ISUID | S_ISGID);
99f89551
EB		 1981 security_task_to_inode(task, inode);
1982 put_task_struct(task);
1983 return 1;
1984 }
b835996f 1985 rcu_read_unlock();
1da177e4 1986 put_files_struct(files);
1da177e4 1987 }
99f89551 1988 put_task_struct(task);
1da177e4
LT		 1989 }
1990 d_drop(dentry);
1991 return 0;
1992}
1993
d72f71eb 1994static const struct dentry_operations tid_fd_dentry_operations =
1da177e4
LT		 1995{
1996 .d_revalidate = tid_fd_revalidate,
1997 .d_delete = pid_delete_dentry,
1998};
1999
444ceed8 2000static struct dentry *proc_fd_instantiate(struct inode *dir,
c5141e6d 2001 struct dentry *dentry, struct task_struct *task, const void *ptr)
1da177e4 2002{
c5141e6d 2003 unsigned fd = *(const unsigned *)ptr;
444ceed8
EB		 2004 struct file *file;
2005 struct files_struct *files;
2006 struct inode *inode;
2007 struct proc_inode *ei;
2008 struct dentry *error = ERR_PTR(-ENOENT);
1da177e4 2009
61a28784 2010 inode = proc_pid_make_inode(dir->i_sb, task);
1da177e4
LT		 2011 if (!inode)
2012 goto out;
2013 ei = PROC_I(inode);
aed7a6c4 2014 ei->fd = fd;
1da177e4
LT		 2015 files = get_files_struct(task);
2016 if (!files)
444ceed8 2017 goto out_iput;
1da177e4 2018 inode->i_mode = S_IFLNK;
ca99c1da
DS		 2019
2020 /*
2021 * We are not taking a ref to the file structure, so we must
2022 * hold ->file_lock.
2023 */
2024 spin_lock(&files->file_lock);
1da177e4
LT		 2025 file = fcheck_files(files, fd);
2026 if (!file)
444ceed8 2027 goto out_unlock;
aeb5d727 2028 if (file->f_mode & FMODE_READ)
1da177e4 2029 inode->i_mode |= S_IRUSR | S_IXUSR;
aeb5d727 2030 if (file->f_mode & FMODE_WRITE)
1da177e4 2031 inode->i_mode |= S_IWUSR | S_IXUSR;
ca99c1da 2032 spin_unlock(&files->file_lock);
1da177e4 2033 put_files_struct(files);
444ceed8 2034
1da177e4
LT		 2035 inode->i_op = &proc_pid_link_inode_operations;
2036 inode->i_size = 64;
2037 ei->op.proc_get_link = proc_fd_link;
fb045adb 2038 d_set_d_op(dentry, &tid_fd_dentry_operations);
1da177e4 2039 d_add(dentry, inode);
cd6a3ce9
EB		 2040 /* Close the race of the process dying before we return the dentry */
2041 if (tid_fd_revalidate(dentry, NULL))
444ceed8 2042 error = NULL;
1da177e4 2043
444ceed8
EB		 2044 out:
2045 return error;
2046out_unlock:
ca99c1da 2047 spin_unlock(&files->file_lock);
1da177e4 2048 put_files_struct(files);
444ceed8 2049out_iput:
1da177e4 2050 iput(inode);
cd6a3ce9 2051 goto out;
1da177e4
LT		 2052}
2053
27932742
MS		 2054static struct dentry *proc_lookupfd_common(struct inode *dir,
2055 struct dentry *dentry,
2056 instantiate_t instantiate)
444ceed8
EB		 2057{
2058 struct task_struct *task = get_proc_task(dir);
2059 unsigned fd = name_to_int(dentry);
2060 struct dentry *result = ERR_PTR(-ENOENT);
2061
2062 if (!task)
2063 goto out_no_task;
2064 if (fd == ~0U)
2065 goto out;
2066
27932742 2067 result = instantiate(dir, dentry, task, &fd);
444ceed8
EB		 2068out:
2069 put_task_struct(task);
2070out_no_task:
2071 return result;
2072}
2073
27932742
MS		 2074static int proc_readfd_common(struct file * filp, void * dirent,
2075 filldir_t filldir, instantiate_t instantiate)
28a6d671 2076{
2fddfeef 2077 struct dentry *dentry = filp->f_path.dentry;
28a6d671
EB		 2078 struct inode *inode = dentry->d_inode;
2079 struct task_struct *p = get_proc_task(inode);
457c2510 2080 unsigned int fd, ino;
28a6d671 2081 int retval;
28a6d671 2082 struct files_struct * files;
1da177e4 2083
28a6d671
EB		 2084 retval = -ENOENT;
2085 if (!p)
2086 goto out_no_task;
2087 retval = 0;
28a6d671
EB		 2088
2089 fd = filp->f_pos;
2090 switch (fd) {
2091 case 0:
2092 if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0)
2093 goto out;
2094 filp->f_pos++;
2095 case 1:
2096 ino = parent_ino(dentry);
2097 if (filldir(dirent, "..", 2, 1, ino, DT_DIR) < 0)
2098 goto out;
2099 filp->f_pos++;
2100 default:
2101 files = get_files_struct(p);
2102 if (!files)
2103 goto out;
2104 rcu_read_lock();
28a6d671 2105 for (fd = filp->f_pos-2;
9b4f526c 2106 fd < files_fdtable(files)->max_fds;
28a6d671 2107 fd++, filp->f_pos++) {
27932742
MS		 2108 char name[PROC_NUMBUF];
2109 int len;
28a6d671
EB		 2110
2111 if (!fcheck_files(files, fd))
2112 continue;
2113 rcu_read_unlock();
2114
27932742
MS		 2115 len = snprintf(name, sizeof(name), "%d", fd);
2116 if (proc_fill_cache(filp, dirent, filldir,
2117 name, len, instantiate,
2118 p, &fd) < 0) {
28a6d671
EB		 2119 rcu_read_lock();
2120 break;
2121 }
2122 rcu_read_lock();
2123 }
2124 rcu_read_unlock();
2125 put_files_struct(files);
2126 }
2127out:
2128 put_task_struct(p);
2129out_no_task:
2130 return retval;
2131}
2132
27932742
MS		 2133static struct dentry *proc_lookupfd(struct inode *dir, struct dentry *dentry,
2134 struct nameidata *nd)
2135{
2136 return proc_lookupfd_common(dir, dentry, proc_fd_instantiate);
2137}
2138
2139static int proc_readfd(struct file *filp, void *dirent, filldir_t filldir)
2140{
2141 return proc_readfd_common(filp, dirent, filldir, proc_fd_instantiate);
2142}
2143
2144static ssize_t proc_fdinfo_read(struct file *file, char __user *buf,
2145 size_t len, loff_t *ppos)
2146{
2147 char tmp[PROC_FDINFO_MAX];
3dcd25f3 2148 int err = proc_fd_info(file->f_path.dentry->d_inode, NULL, tmp);
27932742
MS		 2149 if (!err)
2150 err = simple_read_from_buffer(buf, len, ppos, tmp, strlen(tmp));
2151 return err;
2152}
2153
2154static const struct file_operations proc_fdinfo_file_operations = {
87df8424 2155 .open = nonseekable_open,
27932742 2156 .read = proc_fdinfo_read,
6038f373 2157 .llseek = no_llseek,
27932742
MS		 2158};
2159
00977a59 2160static const struct file_operations proc_fd_operations = {
28a6d671
EB		 2161 .read = generic_read_dir,
2162 .readdir = proc_readfd,
6038f373 2163 .llseek = default_llseek,
1da177e4
LT		 2164};
2165
8948e11f
AD		 2166/*
2167 * /proc/pid/fd needs a special permission handler so that a process can still
2168 * access /proc/self/fd after it has executed a setuid().
2169 */
b74c79e9 2170static int proc_fd_permission(struct inode *inode, int mask, unsigned int flags)
8948e11f 2171{
cf127911 2172 int rv = generic_permission(inode, mask, flags, NULL);
8948e11f
AD		 2173 if (rv == 0)
2174 return 0;
2175 if (task_pid(current) == proc_pid(inode))
2176 rv = 0;
2177 return rv;
2178}
2179
1da177e4
LT		 2180/*
2181 * proc directories can do almost nothing..
2182 */
c5ef1c42 2183static const struct inode_operations proc_fd_inode_operations = {
1da177e4 2184 .lookup = proc_lookupfd,
8948e11f 2185 .permission = proc_fd_permission,
6d76fa58 2186 .setattr = proc_setattr,
1da177e4
LT		 2187};
2188
27932742
MS		 2189static struct dentry *proc_fdinfo_instantiate(struct inode *dir,
2190 struct dentry *dentry, struct task_struct *task, const void *ptr)
2191{
2192 unsigned fd = *(unsigned *)ptr;
2193 struct inode *inode;
2194 struct proc_inode *ei;
2195 struct dentry *error = ERR_PTR(-ENOENT);
2196
2197 inode = proc_pid_make_inode(dir->i_sb, task);
2198 if (!inode)
2199 goto out;
2200 ei = PROC_I(inode);
2201 ei->fd = fd;
2202 inode->i_mode = S_IFREG | S_IRUSR;
2203 inode->i_fop = &proc_fdinfo_file_operations;
fb045adb 2204 d_set_d_op(dentry, &tid_fd_dentry_operations);
27932742
MS		 2205 d_add(dentry, inode);
2206 /* Close the race of the process dying before we return the dentry */
2207 if (tid_fd_revalidate(dentry, NULL))
2208 error = NULL;
2209
2210 out:
2211 return error;
2212}
2213
2214static struct dentry *proc_lookupfdinfo(struct inode *dir,
2215 struct dentry *dentry,
2216 struct nameidata *nd)
2217{
2218 return proc_lookupfd_common(dir, dentry, proc_fdinfo_instantiate);
2219}
2220
2221static int proc_readfdinfo(struct file *filp, void *dirent, filldir_t filldir)
2222{
2223 return proc_readfd_common(filp, dirent, filldir,
2224 proc_fdinfo_instantiate);
2225}
2226
2227static const struct file_operations proc_fdinfo_operations = {
2228 .read = generic_read_dir,
2229 .readdir = proc_readfdinfo,
6038f373 2230 .llseek = default_llseek,
27932742
MS		 2231};
2232
2233/*
2234 * proc directories can do almost nothing..
2235 */
2236static const struct inode_operations proc_fdinfo_inode_operations = {
2237 .lookup = proc_lookupfdinfo,
2238 .setattr = proc_setattr,
2239};
2240
2241
444ceed8 2242static struct dentry *proc_pident_instantiate(struct inode *dir,
c5141e6d 2243 struct dentry *dentry, struct task_struct *task, const void *ptr)
444ceed8 2244{
c5141e6d 2245 const struct pid_entry *p = ptr;
444ceed8
EB		 2246 struct inode *inode;
2247 struct proc_inode *ei;
bd6daba9 2248 struct dentry *error = ERR_PTR(-ENOENT);
444ceed8 2249
61a28784 2250 inode = proc_pid_make_inode(dir->i_sb, task);
444ceed8
EB		 2251 if (!inode)
2252 goto out;
2253
2254 ei = PROC_I(inode);
2255 inode->i_mode = p->mode;
2256 if (S_ISDIR(inode->i_mode))
2257 inode->i_nlink = 2; /* Use getattr to fix if necessary */
2258 if (p->iop)
2259 inode->i_op = p->iop;
2260 if (p->fop)
2261 inode->i_fop = p->fop;
2262 ei->op = p->op;
fb045adb 2263 d_set_d_op(dentry, &pid_dentry_operations);
444ceed8
EB		 2264 d_add(dentry, inode);
2265 /* Close the race of the process dying before we return the dentry */
2266 if (pid_revalidate(dentry, NULL))
2267 error = NULL;
2268out:
2269 return error;
2270}
2271
1da177e4
LT		 2272static struct dentry *proc_pident_lookup(struct inode *dir,
2273 struct dentry *dentry,
c5141e6d 2274 const struct pid_entry *ents,
7bcd6b0e 2275 unsigned int nents)
1da177e4 2276{
cd6a3ce9 2277 struct dentry *error;
99f89551 2278 struct task_struct *task = get_proc_task(dir);
c5141e6d 2279 const struct pid_entry *p, *last;
1da177e4 2280
cd6a3ce9 2281 error = ERR_PTR(-ENOENT);
1da177e4 2282
99f89551
EB		 2283 if (!task)
2284 goto out_no_task;
1da177e4 2285
20cdc894
EB		 2286 /*
2287 * Yes, it does not scale. And it should not. Don't add
2288 * new entries into /proc/<tgid>/ without very good reasons.
2289 */
7bcd6b0e
EB		 2290 last = &ents[nents - 1];
2291 for (p = ents; p <= last; p++) {
1da177e4
LT		 2292 if (p->len != dentry->d_name.len)
2293 continue;
2294 if (!memcmp(dentry->d_name.name, p->name, p->len))
2295 break;
2296 }
7bcd6b0e 2297 if (p > last)
1da177e4
LT		 2298 goto out;
2299
444ceed8 2300 error = proc_pident_instantiate(dir, dentry, task, p);
1da177e4 2301out:
99f89551
EB		 2302 put_task_struct(task);
2303out_no_task:
cd6a3ce9 2304 return error;
1da177e4
LT		 2305}
2306
c5141e6d
ED		 2307static int proc_pident_fill_cache(struct file *filp, void *dirent,
2308 filldir_t filldir, struct task_struct *task, const struct pid_entry *p)
61a28784
EB		 2309{
2310 return proc_fill_cache(filp, dirent, filldir, p->name, p->len,
2311 proc_pident_instantiate, task, p);
2312}
2313
28a6d671
EB		 2314static int proc_pident_readdir(struct file *filp,
2315 void *dirent, filldir_t filldir,
c5141e6d 2316 const struct pid_entry *ents, unsigned int nents)
28a6d671
EB		 2317{
2318 int i;
2fddfeef 2319 struct dentry *dentry = filp->f_path.dentry;
28a6d671
EB		 2320 struct inode *inode = dentry->d_inode;
2321 struct task_struct *task = get_proc_task(inode);
c5141e6d 2322 const struct pid_entry *p, *last;
28a6d671
EB		 2323 ino_t ino;
2324 int ret;
2325
2326 ret = -ENOENT;
2327 if (!task)
61a28784 2328 goto out_no_task;
28a6d671
EB		 2329
2330 ret = 0;
28a6d671
EB		 2331 i = filp->f_pos;
2332 switch (i) {
2333 case 0:
2334 ino = inode->i_ino;
2335 if (filldir(dirent, ".", 1, i, ino, DT_DIR) < 0)
2336 goto out;
2337 i++;
2338 filp->f_pos++;
2339 /* fall through */
2340 case 1:
2341 ino = parent_ino(dentry);
2342 if (filldir(dirent, "..", 2, i, ino, DT_DIR) < 0)
2343 goto out;
2344 i++;
2345 filp->f_pos++;
2346 /* fall through */
2347 default:
2348 i -= 2;
2349 if (i >= nents) {
2350 ret = 1;
2351 goto out;
2352 }
2353 p = ents + i;
7bcd6b0e
EB		 2354 last = &ents[nents - 1];
2355 while (p <= last) {
61a28784 2356 if (proc_pident_fill_cache(filp, dirent, filldir, task, p) < 0)
28a6d671
EB		 2357 goto out;
2358 filp->f_pos++;
2359 p++;
2360 }
2361 }
2362
2363 ret = 1;
2364out:
61a28784
EB		 2365 put_task_struct(task);
2366out_no_task:
28a6d671 2367 return ret;
1da177e4
LT		 2368}
2369
28a6d671
EB		 2370#ifdef CONFIG_SECURITY
2371static ssize_t proc_pid_attr_read(struct file * file, char __user * buf,
2372 size_t count, loff_t *ppos)
2373{
2fddfeef 2374 struct inode * inode = file->f_path.dentry->d_inode;
04ff9708 2375 char *p = NULL;
28a6d671
EB		 2376 ssize_t length;
2377 struct task_struct *task = get_proc_task(inode);
2378
28a6d671 2379 if (!task)
04ff9708 2380 return -ESRCH;
28a6d671
EB		 2381
2382 length = security_getprocattr(task,
2fddfeef 2383 (char*)file->f_path.dentry->d_name.name,
04ff9708 2384 &p);
28a6d671 2385 put_task_struct(task);
04ff9708
AV		 2386 if (length > 0)
2387 length = simple_read_from_buffer(buf, count, ppos, p, length);
2388 kfree(p);
28a6d671 2389 return length;
1da177e4
LT		 2390}
2391
28a6d671
EB		 2392static ssize_t proc_pid_attr_write(struct file * file, const char __user * buf,
2393 size_t count, loff_t *ppos)
2394{
2fddfeef 2395 struct inode * inode = file->f_path.dentry->d_inode;
28a6d671
EB		 2396 char *page;
2397 ssize_t length;
2398 struct task_struct *task = get_proc_task(inode);
2399
2400 length = -ESRCH;
2401 if (!task)
2402 goto out_no_task;
2403 if (count > PAGE_SIZE)
2404 count = PAGE_SIZE;
2405
2406 /* No partial writes. */
2407 length = -EINVAL;
2408 if (*ppos != 0)
2409 goto out;
2410
2411 length = -ENOMEM;
e12ba74d 2412 page = (char*)__get_free_page(GFP_TEMPORARY);
28a6d671
EB		 2413 if (!page)
2414 goto out;
2415
2416 length = -EFAULT;
2417 if (copy_from_user(page, buf, count))
2418 goto out_free;
2419
107db7c7 2420 /* Guard against adverse ptrace interaction */
9b1bf12d 2421 length = mutex_lock_interruptible(&task->signal->cred_guard_mutex);
107db7c7
DH		 2422 if (length < 0)
2423 goto out_free;
2424
28a6d671 2425 length = security_setprocattr(task,
2fddfeef 2426 (char*)file->f_path.dentry->d_name.name,
28a6d671 2427 (void*)page, count);
9b1bf12d 2428 mutex_unlock(&task->signal->cred_guard_mutex);
28a6d671
EB		 2429out_free:
2430 free_page((unsigned long) page);
2431out:
2432 put_task_struct(task);
2433out_no_task:
2434 return length;
2435}
2436
00977a59 2437static const struct file_operations proc_pid_attr_operations = {
28a6d671
EB		 2438 .read = proc_pid_attr_read,
2439 .write = proc_pid_attr_write,
87df8424 2440 .llseek = generic_file_llseek,
28a6d671
EB		 2441};
2442
c5141e6d 2443static const struct pid_entry attr_dir_stuff[] = {
631f9c18
AD		 2444 REG("current", S_IRUGO|S_IWUGO, proc_pid_attr_operations),
2445 REG("prev", S_IRUGO, proc_pid_attr_operations),
2446 REG("exec", S_IRUGO|S_IWUGO, proc_pid_attr_operations),
2447 REG("fscreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations),
2448 REG("keycreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations),
2449 REG("sockcreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations),
28a6d671
EB		 2450};
2451
72d9dcfc 2452static int proc_attr_dir_readdir(struct file * filp,
28a6d671
EB		 2453 void * dirent, filldir_t filldir)
2454{
2455 return proc_pident_readdir(filp,dirent,filldir,
72d9dcfc 2456 attr_dir_stuff,ARRAY_SIZE(attr_dir_stuff));
28a6d671
EB		 2457}
2458
00977a59 2459static const struct file_operations proc_attr_dir_operations = {
1da177e4 2460 .read = generic_read_dir,
72d9dcfc 2461 .readdir = proc_attr_dir_readdir,
6038f373 2462 .llseek = default_llseek,
1da177e4
LT		 2463};
2464
72d9dcfc 2465static struct dentry *proc_attr_dir_lookup(struct inode *dir,
28a6d671
EB		 2466 struct dentry *dentry, struct nameidata *nd)
2467{
7bcd6b0e
EB		 2468 return proc_pident_lookup(dir, dentry,
2469 attr_dir_stuff, ARRAY_SIZE(attr_dir_stuff));
28a6d671
EB		 2470}
2471
c5ef1c42 2472static const struct inode_operations proc_attr_dir_inode_operations = {
72d9dcfc 2473 .lookup = proc_attr_dir_lookup,
99f89551 2474 .getattr = pid_getattr,
6d76fa58 2475 .setattr = proc_setattr,
1da177e4
LT		 2476};
2477
28a6d671
EB		 2478#endif
2479
698ba7b5 2480#ifdef CONFIG_ELF_CORE
3cb4a0bb
KH		 2481static ssize_t proc_coredump_filter_read(struct file *file, char __user *buf,
2482 size_t count, loff_t *ppos)
2483{
2484 struct task_struct *task = get_proc_task(file->f_dentry->d_inode);
2485 struct mm_struct *mm;
2486 char buffer[PROC_NUMBUF];
2487 size_t len;
2488 int ret;
2489
2490 if (!task)
2491 return -ESRCH;
2492
2493 ret = 0;
2494 mm = get_task_mm(task);
2495 if (mm) {
2496 len = snprintf(buffer, sizeof(buffer), "%08lx\n",
2497 ((mm->flags & MMF_DUMP_FILTER_MASK) >>
2498 MMF_DUMP_FILTER_SHIFT));
2499 mmput(mm);
2500 ret = simple_read_from_buffer(buf, count, ppos, buffer, len);
2501 }
2502
2503 put_task_struct(task);
2504
2505 return ret;
2506}
2507
2508static ssize_t proc_coredump_filter_write(struct file *file,
2509 const char __user *buf,
2510 size_t count,
2511 loff_t *ppos)
2512{
2513 struct task_struct *task;
2514 struct mm_struct *mm;
2515 char buffer[PROC_NUMBUF], *end;
2516 unsigned int val;
2517 int ret;
2518 int i;
2519 unsigned long mask;
2520
2521 ret = -EFAULT;
2522 memset(buffer, 0, sizeof(buffer));
2523 if (count > sizeof(buffer) - 1)
2524 count = sizeof(buffer) - 1;
2525 if (copy_from_user(buffer, buf, count))
2526 goto out_no_task;
2527
2528 ret = -EINVAL;
2529 val = (unsigned int)simple_strtoul(buffer, &end, 0);
2530 if (*end == '\n')
2531 end++;
2532 if (end - buffer == 0)
2533 goto out_no_task;
2534
2535 ret = -ESRCH;
2536 task = get_proc_task(file->f_dentry->d_inode);
2537 if (!task)
2538 goto out_no_task;
2539
2540 ret = end - buffer;
2541 mm = get_task_mm(task);
2542 if (!mm)
2543 goto out_no_mm;
2544
2545 for (i = 0, mask = 1; i < MMF_DUMP_FILTER_BITS; i++, mask <<= 1) {
2546 if (val & mask)
2547 set_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags);
2548 else
2549 clear_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags);
2550 }
2551
2552 mmput(mm);
2553 out_no_mm:
2554 put_task_struct(task);
2555 out_no_task:
2556 return ret;
2557}
2558
2559static const struct file_operations proc_coredump_filter_operations = {
2560 .read = proc_coredump_filter_read,
2561 .write = proc_coredump_filter_write,
87df8424 2562 .llseek = generic_file_llseek,
3cb4a0bb
KH		 2563};
2564#endif
2565
28a6d671
EB		 2566/*
2567 * /proc/self:
2568 */
2569static int proc_self_readlink(struct dentry *dentry, char __user *buffer,
2570 int buflen)
2571{
488e5bc4 2572 struct pid_namespace *ns = dentry->d_sb->s_fs_info;
b55fcb22 2573 pid_t tgid = task_tgid_nr_ns(current, ns);
28a6d671 2574 char tmp[PROC_NUMBUF];
b55fcb22 2575 if (!tgid)
488e5bc4 2576 return -ENOENT;
b55fcb22 2577 sprintf(tmp, "%d", tgid);
28a6d671
EB		 2578 return vfs_readlink(dentry,buffer,buflen,tmp);
2579}
2580
2581static void *proc_self_follow_link(struct dentry *dentry, struct nameidata *nd)
2582{
488e5bc4 2583 struct pid_namespace *ns = dentry->d_sb->s_fs_info;
b55fcb22 2584 pid_t tgid = task_tgid_nr_ns(current, ns);
7fee4868
AV		 2585 char *name = ERR_PTR(-ENOENT);
2586 if (tgid) {
2587 name = __getname();
2588 if (!name)
2589 name = ERR_PTR(-ENOMEM);
2590 else
2591 sprintf(name, "%d", tgid);
2592 }
2593 nd_set_link(nd, name);
2594 return NULL;
2595}
2596
2597static void proc_self_put_link(struct dentry *dentry, struct nameidata *nd,
2598 void *cookie)
2599{
2600 char *s = nd_get_link(nd);
2601 if (!IS_ERR(s))
2602 __putname(s);
28a6d671
EB		 2603}
2604
c5ef1c42 2605static const struct inode_operations proc_self_inode_operations = {
28a6d671
EB		 2606 .readlink = proc_self_readlink,
2607 .follow_link = proc_self_follow_link,
7fee4868 2608 .put_link = proc_self_put_link,
28a6d671
EB		 2609};
2610
801199ce
EB		 2611/*
2612 * proc base
2613 *
2614 * These are the directory entries in the root directory of /proc
2615 * that properly belong to the /proc filesystem, as they describe
2616 * describe something that is process related.
2617 */
c5141e6d 2618static const struct pid_entry proc_base_stuff[] = {
61a28784 2619 NOD("self", S_IFLNK|S_IRWXUGO,
801199ce 2620 &proc_self_inode_operations, NULL, {}),
801199ce
EB		 2621};
2622
444ceed8 2623static struct dentry *proc_base_instantiate(struct inode *dir,
c5141e6d 2624 struct dentry *dentry, struct task_struct *task, const void *ptr)
801199ce 2625{
c5141e6d 2626 const struct pid_entry *p = ptr;
801199ce 2627 struct inode *inode;
801199ce 2628 struct proc_inode *ei;
73d36460 2629 struct dentry *error;
801199ce
EB		 2630
2631 /* Allocate the inode */
2632 error = ERR_PTR(-ENOMEM);
2633 inode = new_inode(dir->i_sb);
2634 if (!inode)
2635 goto out;
2636
2637 /* Initialize the inode */
2638 ei = PROC_I(inode);
85fe4025 2639 inode->i_ino = get_next_ino();
801199ce 2640 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
801199ce
EB		 2641
2642 /*
2643 * grab the reference to the task.
2644 */
1a657f78 2645 ei->pid = get_task_pid(task, PIDTYPE_PID);
801199ce
EB		 2646 if (!ei->pid)
2647 goto out_iput;
2648
801199ce
EB		 2649 inode->i_mode = p->mode;
2650 if (S_ISDIR(inode->i_mode))
2651 inode->i_nlink = 2;
2652 if (S_ISLNK(inode->i_mode))
2653 inode->i_size = 64;
2654 if (p->iop)
2655 inode->i_op = p->iop;
2656 if (p->fop)
2657 inode->i_fop = p->fop;
2658 ei->op = p->op;
801199ce
EB		 2659 d_add(dentry, inode);
2660 error = NULL;
2661out:
801199ce
EB		 2662 return error;
2663out_iput:
2664 iput(inode);
2665 goto out;
2666}
2667
444ceed8
EB		 2668static struct dentry *proc_base_lookup(struct inode *dir, struct dentry *dentry)
2669{
2670 struct dentry *error;
2671 struct task_struct *task = get_proc_task(dir);
c5141e6d 2672 const struct pid_entry *p, *last;
444ceed8
EB		 2673
2674 error = ERR_PTR(-ENOENT);
2675
2676 if (!task)
2677 goto out_no_task;
2678
2679 /* Lookup the directory entry */
7bcd6b0e
EB		 2680 last = &proc_base_stuff[ARRAY_SIZE(proc_base_stuff) - 1];
2681 for (p = proc_base_stuff; p <= last; p++) {
444ceed8
EB		 2682 if (p->len != dentry->d_name.len)
2683 continue;
2684 if (!memcmp(dentry->d_name.name, p->name, p->len))
2685 break;
2686 }
7bcd6b0e 2687 if (p > last)
444ceed8
EB		 2688 goto out;
2689
2690 error = proc_base_instantiate(dir, dentry, task, p);
2691
2692out:
2693 put_task_struct(task);
2694out_no_task:
2695 return error;
2696}
2697
c5141e6d
ED		 2698static int proc_base_fill_cache(struct file *filp, void *dirent,
2699 filldir_t filldir, struct task_struct *task, const struct pid_entry *p)
61a28784
EB		 2700{
2701 return proc_fill_cache(filp, dirent, filldir, p->name, p->len,
2702 proc_base_instantiate, task, p);
2703}
2704
aba76fdb 2705#ifdef CONFIG_TASK_IO_ACCOUNTING
297c5d92
AR		 2706static int do_io_accounting(struct task_struct *task, char *buffer, int whole)
2707{
940389b8 2708 struct task_io_accounting acct = task->ioac;
5995477a
AR		 2709 unsigned long flags;
2710
2711 if (whole && lock_task_sighand(task, &flags)) {
2712 struct task_struct *t = task;
2713
2714 task_io_accounting_add(&acct, &task->signal->ioac);
2715 while_each_thread(task, t)
2716 task_io_accounting_add(&acct, &t->ioac);
2717
2718 unlock_task_sighand(task, &flags);
297c5d92 2719 }
aba76fdb
AM		 2720 return sprintf(buffer,
2721 "rchar: %llu\n"
2722 "wchar: %llu\n"
2723 "syscr: %llu\n"
2724 "syscw: %llu\n"
2725 "read_bytes: %llu\n"
2726 "write_bytes: %llu\n"
2727 "cancelled_write_bytes: %llu\n",
7c44319d
AB		 2728 (unsigned long long)acct.rchar,
2729 (unsigned long long)acct.wchar,
2730 (unsigned long long)acct.syscr,
2731 (unsigned long long)acct.syscw,
2732 (unsigned long long)acct.read_bytes,
2733 (unsigned long long)acct.write_bytes,
2734 (unsigned long long)acct.cancelled_write_bytes);
297c5d92
AR		 2735}
2736
2737static int proc_tid_io_accounting(struct task_struct *task, char *buffer)
2738{
2739 return do_io_accounting(task, buffer, 0);
aba76fdb 2740}
297c5d92
AR		 2741
2742static int proc_tgid_io_accounting(struct task_struct *task, char *buffer)
2743{
2744 return do_io_accounting(task, buffer, 1);
2745}
2746#endif /* CONFIG_TASK_IO_ACCOUNTING */
aba76fdb 2747
47830723
KC		 2748static int proc_pid_personality(struct seq_file *m, struct pid_namespace *ns,
2749 struct pid *pid, struct task_struct *task)
2750{
a9712bc1
AV		 2751 int err = lock_trace(task);
2752 if (!err) {
2753 seq_printf(m, "%08x\n", task->personality);
2754 unlock_trace(task);
2755 }
2756 return err;
47830723
KC		 2757}
2758
28a6d671
EB		 2759/*
2760 * Thread groups
2761 */
00977a59 2762static const struct file_operations proc_task_operations;
c5ef1c42 2763static const struct inode_operations proc_task_inode_operations;
20cdc894 2764
c5141e6d 2765static const struct pid_entry tgid_base_stuff[] = {
631f9c18
AD		 2766 DIR("task", S_IRUGO|S_IXUGO, proc_task_inode_operations, proc_task_operations),
2767 DIR("fd", S_IRUSR|S_IXUSR, proc_fd_inode_operations, proc_fd_operations),
2768 DIR("fdinfo", S_IRUSR|S_IXUSR, proc_fdinfo_inode_operations, proc_fdinfo_operations),
6b4e306a 2769 DIR("ns", S_IRUSR|S_IXUGO, proc_ns_dir_inode_operations, proc_ns_dir_operations),
b2211a36 2770#ifdef CONFIG_NET
631f9c18 2771 DIR("net", S_IRUGO|S_IXUGO, proc_net_inode_operations, proc_net_operations),
b2211a36 2772#endif
631f9c18
AD		 2773 REG("environ", S_IRUSR, proc_environ_operations),
2774 INF("auxv", S_IRUSR, proc_pid_auxv),
2775 ONE("status", S_IRUGO, proc_pid_status),
a9712bc1 2776 ONE("personality", S_IRUGO, proc_pid_personality),
3036e7b4 2777 INF("limits", S_IRUGO, proc_pid_limits),
43ae34cb 2778#ifdef CONFIG_SCHED_DEBUG
631f9c18 2779 REG("sched", S_IRUGO|S_IWUSR, proc_pid_sched_operations),
5091faa4
MG		 2780#endif
2781#ifdef CONFIG_SCHED_AUTOGROUP
2782 REG("autogroup", S_IRUGO|S_IWUSR, proc_pid_sched_autogroup_operations),
ebcb6734 2783#endif
4614a696 2784 REG("comm", S_IRUGO|S_IWUSR, proc_pid_set_comm_operations),
ebcb6734 2785#ifdef CONFIG_HAVE_ARCH_TRACEHOOK
a9712bc1 2786 INF("syscall", S_IRUGO, proc_pid_syscall),
43ae34cb 2787#endif
631f9c18
AD		 2788 INF("cmdline", S_IRUGO, proc_pid_cmdline),
2789 ONE("stat", S_IRUGO, proc_tgid_stat),
2790 ONE("statm", S_IRUGO, proc_pid_statm),
2791 REG("maps", S_IRUGO, proc_maps_operations),
28a6d671 2792#ifdef CONFIG_NUMA
631f9c18 2793 REG("numa_maps", S_IRUGO, proc_numa_maps_operations),
28a6d671 2794#endif
631f9c18
AD		 2795 REG("mem", S_IRUSR|S_IWUSR, proc_mem_operations),
2796 LNK("cwd", proc_cwd_link),
2797 LNK("root", proc_root_link),
2798 LNK("exe", proc_exe_link),
2799 REG("mounts", S_IRUGO, proc_mounts_operations),
2800 REG("mountinfo", S_IRUGO, proc_mountinfo_operations),
2801 REG("mountstats", S_IRUSR, proc_mountstats_operations),
1e883281 2802#ifdef CONFIG_PROC_PAGE_MONITOR
631f9c18
AD		 2803 REG("clear_refs", S_IWUSR, proc_clear_refs_operations),
2804 REG("smaps", S_IRUGO, proc_smaps_operations),
ca6b0bf0 2805 REG("pagemap", S_IRUGO, proc_pagemap_operations),
28a6d671
EB		 2806#endif
2807#ifdef CONFIG_SECURITY
631f9c18 2808 DIR("attr", S_IRUGO|S_IXUGO, proc_attr_dir_inode_operations, proc_attr_dir_operations),
28a6d671
EB		 2809#endif
2810#ifdef CONFIG_KALLSYMS
631f9c18 2811 INF("wchan", S_IRUGO, proc_pid_wchan),
28a6d671 2812#endif
2ec220e2 2813#ifdef CONFIG_STACKTRACE
a9712bc1 2814 ONE("stack", S_IRUGO, proc_pid_stack),
28a6d671
EB		 2815#endif
2816#ifdef CONFIG_SCHEDSTATS
631f9c18 2817 INF("schedstat", S_IRUGO, proc_pid_schedstat),
28a6d671 2818#endif
9745512c 2819#ifdef CONFIG_LATENCYTOP
631f9c18 2820 REG("latency", S_IRUGO, proc_lstats_operations),
9745512c 2821#endif
8793d854 2822#ifdef CONFIG_PROC_PID_CPUSET
631f9c18 2823 REG("cpuset", S_IRUGO, proc_cpuset_operations),
a424316c
PM		 2824#endif
2825#ifdef CONFIG_CGROUPS
631f9c18 2826 REG("cgroup", S_IRUGO, proc_cgroup_operations),
28a6d671 2827#endif
631f9c18
AD		 2828 INF("oom_score", S_IRUGO, proc_oom_score),
2829 REG("oom_adj", S_IRUGO|S_IWUSR, proc_oom_adjust_operations),
a63d83f4 2830 REG("oom_score_adj", S_IRUGO|S_IWUSR, proc_oom_score_adj_operations),
28a6d671 2831#ifdef CONFIG_AUDITSYSCALL
631f9c18
AD		 2832 REG("loginuid", S_IWUSR|S_IRUGO, proc_loginuid_operations),
2833 REG("sessionid", S_IRUGO, proc_sessionid_operations),
28a6d671 2834#endif
f4f154fd 2835#ifdef CONFIG_FAULT_INJECTION
631f9c18 2836 REG("make-it-fail", S_IRUGO|S_IWUSR, proc_fault_inject_operations),
f4f154fd 2837#endif
698ba7b5 2838#ifdef CONFIG_ELF_CORE
631f9c18 2839 REG("coredump_filter", S_IRUGO|S_IWUSR, proc_coredump_filter_operations),
3cb4a0bb 2840#endif
aba76fdb 2841#ifdef CONFIG_TASK_IO_ACCOUNTING
631f9c18 2842 INF("io", S_IRUGO, proc_tgid_io_accounting),
aba76fdb 2843#endif
f133ecca
CM		 2844#ifdef CONFIG_HARDWALL
2845 INF("hardwall", S_IRUGO, proc_pid_hardwall),
2846#endif
28a6d671 2847};
1da177e4 2848
28a6d671 2849static int proc_tgid_base_readdir(struct file * filp,
1da177e4
LT		 2850 void * dirent, filldir_t filldir)
2851{
2852 return proc_pident_readdir(filp,dirent,filldir,
28a6d671 2853 tgid_base_stuff,ARRAY_SIZE(tgid_base_stuff));
1da177e4
LT		 2854}
2855
00977a59 2856static const struct file_operations proc_tgid_base_operations = {
1da177e4 2857 .read = generic_read_dir,
28a6d671 2858 .readdir = proc_tgid_base_readdir,
6038f373 2859 .llseek = default_llseek,
1da177e4
LT		 2860};
2861
28a6d671 2862static struct dentry *proc_tgid_base_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd){
7bcd6b0e
EB		 2863 return proc_pident_lookup(dir, dentry,
2864 tgid_base_stuff, ARRAY_SIZE(tgid_base_stuff));
1da177e4
LT		 2865}
2866
c5ef1c42 2867static const struct inode_operations proc_tgid_base_inode_operations = {
28a6d671 2868 .lookup = proc_tgid_base_lookup,
99f89551 2869 .getattr = pid_getattr,
6d76fa58 2870 .setattr = proc_setattr,
1da177e4 2871};
1da177e4 2872
60347f67 2873static void proc_flush_task_mnt(struct vfsmount *mnt, pid_t pid, pid_t tgid)
1da177e4 2874{
48e6484d 2875 struct dentry *dentry, *leader, *dir;
8578cea7 2876 char buf[PROC_NUMBUF];
48e6484d
EB		 2877 struct qstr name;
2878
2879 name.name = buf;
60347f67
PE		 2880 name.len = snprintf(buf, sizeof(buf), "%d", pid);
2881 dentry = d_hash_and_lookup(mnt->mnt_root, &name);
48e6484d 2882 if (dentry) {
29f12ca3 2883 shrink_dcache_parent(dentry);
48e6484d
EB		 2884 d_drop(dentry);
2885 dput(dentry);
2886 }
1da177e4 2887
48e6484d 2888 name.name = buf;
60347f67
PE		 2889 name.len = snprintf(buf, sizeof(buf), "%d", tgid);
2890 leader = d_hash_and_lookup(mnt->mnt_root, &name);
48e6484d
EB		 2891 if (!leader)
2892 goto out;
1da177e4 2893
48e6484d
EB		 2894 name.name = "task";
2895 name.len = strlen(name.name);
2896 dir = d_hash_and_lookup(leader, &name);
2897 if (!dir)
2898 goto out_put_leader;
2899
2900 name.name = buf;
60347f67 2901 name.len = snprintf(buf, sizeof(buf), "%d", pid);
48e6484d
EB		 2902 dentry = d_hash_and_lookup(dir, &name);
2903 if (dentry) {
2904 shrink_dcache_parent(dentry);
2905 d_drop(dentry);
2906 dput(dentry);
1da177e4 2907 }
48e6484d
EB		 2908
2909 dput(dir);
2910out_put_leader:
2911 dput(leader);
2912out:
2913 return;
1da177e4
LT		 2914}
2915
0895e91d
RD		 2916/**
2917 * proc_flush_task - Remove dcache entries for @task from the /proc dcache.
2918 * @task: task that should be flushed.
2919 *
2920 * When flushing dentries from proc, one needs to flush them from global
60347f67 2921 * proc (proc_mnt) and from all the namespaces' procs this task was seen
0895e91d
RD		 2922 * in. This call is supposed to do all of this job.
2923 *
2924 * Looks in the dcache for
2925 * /proc/@pid
2926 * /proc/@tgid/task/@pid
2927 * if either directory is present flushes it and all of it'ts children
2928 * from the dcache.
2929 *
2930 * It is safe and reasonable to cache /proc entries for a task until
2931 * that task exits. After that they just clog up the dcache with
2932 * useless entries, possibly causing useful dcache entries to be
2933 * flushed instead. This routine is proved to flush those useless
2934 * dcache entries at process exit time.
2935 *
2936 * NOTE: This routine is just an optimization so it does not guarantee
2937 * that no dcache entries will exist at process exit time it
2938 * just makes it very unlikely that any will persist.
60347f67
PE		 2939 */
2940
2941void proc_flush_task(struct task_struct *task)
2942{
9fcc2d15 2943 int i;
9b4d1cbe 2944 struct pid *pid, *tgid;
130f77ec
PE		 2945 struct upid *upid;
2946
130f77ec 2947 pid = task_pid(task);
9b4d1cbe 2948 tgid = task_tgid(task);
130f77ec 2949
9fcc2d15 2950 for (i = 0; i <= pid->level; i++) {
130f77ec
PE		 2951 upid = &pid->numbers[i];
2952 proc_flush_task_mnt(upid->ns->proc_mnt, upid->nr,
9b4d1cbe 2953 tgid->numbers[i].nr);
130f77ec 2954 }
6f4e6433
PE		 2955
2956 upid = &pid->numbers[pid->level];
2957 if (upid->nr == 1)
2958 pid_ns_release_proc(upid->ns);
60347f67
PE		 2959}
2960
9711ef99
AB		 2961static struct dentry *proc_pid_instantiate(struct inode *dir,
2962 struct dentry * dentry,
c5141e6d 2963 struct task_struct *task, const void *ptr)
444ceed8
EB		 2964{
2965 struct dentry *error = ERR_PTR(-ENOENT);
2966 struct inode *inode;
2967
61a28784 2968 inode = proc_pid_make_inode(dir->i_sb, task);
444ceed8
EB		 2969 if (!inode)
2970 goto out;
2971
2972 inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO;
2973 inode->i_op = &proc_tgid_base_inode_operations;
2974 inode->i_fop = &proc_tgid_base_operations;
2975 inode->i_flags|=S_IMMUTABLE;
aed54175
VN		 2976
2977 inode->i_nlink = 2 + pid_entry_count_dirs(tgid_base_stuff,
2978 ARRAY_SIZE(tgid_base_stuff));
444ceed8 2979
fb045adb 2980 d_set_d_op(dentry, &pid_dentry_operations);
444ceed8
EB		 2981
2982 d_add(dentry, inode);
2983 /* Close the race of the process dying before we return the dentry */
2984 if (pid_revalidate(dentry, NULL))
2985 error = NULL;
2986out:
2987 return error;
2988}
2989
1da177e4
LT		 2990struct dentry *proc_pid_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd)
2991{
73d36460 2992 struct dentry *result;
1da177e4 2993 struct task_struct *task;
1da177e4 2994 unsigned tgid;
b488893a 2995 struct pid_namespace *ns;
1da177e4 2996
801199ce
EB		 2997 result = proc_base_lookup(dir, dentry);
2998 if (!IS_ERR(result) || PTR_ERR(result) != -ENOENT)
2999 goto out;
3000
1da177e4
LT		 3001 tgid = name_to_int(dentry);
3002 if (tgid == ~0U)
3003 goto out;
3004
b488893a 3005 ns = dentry->d_sb->s_fs_info;
de758734 3006 rcu_read_lock();
b488893a 3007 task = find_task_by_pid_ns(tgid, ns);
1da177e4
LT		 3008 if (task)
3009 get_task_struct(task);
de758734 3010 rcu_read_unlock();
1da177e4
LT		 3011 if (!task)
3012 goto out;
3013
444ceed8 3014 result = proc_pid_instantiate(dir, dentry, task, NULL);
1da177e4 3015 put_task_struct(task);
1da177e4 3016out:
cd6a3ce9 3017 return result;
1da177e4
LT		 3018}
3019
1da177e4 3020/*
0804ef4b 3021 * Find the first task with tgid >= tgid
0bc58a91 3022 *
1da177e4 3023 */
19fd4bb2
EB		 3024struct tgid_iter {
3025 unsigned int tgid;
0804ef4b 3026 struct task_struct *task;
19fd4bb2
EB		 3027};
3028static struct tgid_iter next_tgid(struct pid_namespace *ns, struct tgid_iter iter)
3029{
0804ef4b 3030 struct pid *pid;
1da177e4 3031
19fd4bb2
EB		 3032 if (iter.task)
3033 put_task_struct(iter.task);
454cc105 3034 rcu_read_lock();
0804ef4b 3035retry:
19fd4bb2
EB		 3036 iter.task = NULL;
3037 pid = find_ge_pid(iter.tgid, ns);
0804ef4b 3038 if (pid) {
19fd4bb2
EB		 3039 iter.tgid = pid_nr_ns(pid, ns);
3040 iter.task = pid_task(pid, PIDTYPE_PID);
0804ef4b
EB		 3041 /* What we to know is if the pid we have find is the
3042 * pid of a thread_group_leader. Testing for task
3043 * being a thread_group_leader is the obvious thing
3044 * todo but there is a window when it fails, due to
3045 * the pid transfer logic in de_thread.
3046 *
3047 * So we perform the straight forward test of seeing
3048 * if the pid we have found is the pid of a thread
3049 * group leader, and don't worry if the task we have
3050 * found doesn't happen to be a thread group leader.
3051 * As we don't care in the case of readdir.
3052 */
19fd4bb2
EB		 3053 if (!iter.task || !has_group_leader_pid(iter.task)) {
3054 iter.tgid += 1;
0804ef4b 3055 goto retry;
19fd4bb2
EB		 3056 }
3057 get_task_struct(iter.task);
0bc58a91 3058 }
454cc105 3059 rcu_read_unlock();
19fd4bb2 3060 return iter;
1da177e4
LT		 3061}
3062
7bcd6b0e 3063#define TGID_OFFSET (FIRST_PROCESS_ENTRY + ARRAY_SIZE(proc_base_stuff))
0804ef4b 3064
61a28784 3065static int proc_pid_fill_cache(struct file *filp, void *dirent, filldir_t filldir,
19fd4bb2 3066 struct tgid_iter iter)
61a28784
EB		 3067{
3068 char name[PROC_NUMBUF];
19fd4bb2 3069 int len = snprintf(name, sizeof(name), "%d", iter.tgid);
61a28784 3070 return proc_fill_cache(filp, dirent, filldir, name, len,
19fd4bb2 3071 proc_pid_instantiate, iter.task, NULL);
61a28784
EB		 3072}
3073
1da177e4
LT		 3074/* for the /proc/ directory itself, after non-process stuff has been done */
3075int proc_pid_readdir(struct file * filp, void * dirent, filldir_t filldir)
3076{
d8bdc59f
LT		 3077 unsigned int nr;
3078 struct task_struct *reaper;
19fd4bb2 3079 struct tgid_iter iter;
b488893a 3080 struct pid_namespace *ns;
1da177e4 3081
d8bdc59f
LT		 3082 if (filp->f_pos >= PID_MAX_LIMIT + TGID_OFFSET)
3083 goto out_no_task;
3084 nr = filp->f_pos - FIRST_PROCESS_ENTRY;
3085
3086 reaper = get_proc_task(filp->f_path.dentry->d_inode);
61a28784
EB		 3087 if (!reaper)
3088 goto out_no_task;
3089
7bcd6b0e 3090 for (; nr < ARRAY_SIZE(proc_base_stuff); filp->f_pos++, nr++) {
c5141e6d 3091 const struct pid_entry *p = &proc_base_stuff[nr];
61a28784 3092 if (proc_base_fill_cache(filp, dirent, filldir, reaper, p) < 0)
801199ce 3093 goto out;
1da177e4
LT		 3094 }
3095
b488893a 3096 ns = filp->f_dentry->d_sb->s_fs_info;
19fd4bb2
EB		 3097 iter.task = NULL;
3098 iter.tgid = filp->f_pos - TGID_OFFSET;
3099 for (iter = next_tgid(ns, iter);
3100 iter.task;
3101 iter.tgid += 1, iter = next_tgid(ns, iter)) {
3102 filp->f_pos = iter.tgid + TGID_OFFSET;
3103 if (proc_pid_fill_cache(filp, dirent, filldir, iter) < 0) {
3104 put_task_struct(iter.task);
0804ef4b 3105 goto out;
1da177e4 3106 }
0bc58a91 3107 }
0804ef4b
EB		 3108 filp->f_pos = PID_MAX_LIMIT + TGID_OFFSET;
3109out:
61a28784
EB		 3110 put_task_struct(reaper);
3111out_no_task:
0bc58a91
EB		 3112 return 0;
3113}
1da177e4 3114
28a6d671
EB		 3115/*
3116 * Tasks
3117 */
c5141e6d 3118static const struct pid_entry tid_base_stuff[] = {
631f9c18 3119 DIR("fd", S_IRUSR|S_IXUSR, proc_fd_inode_operations, proc_fd_operations),
3835541d 3120 DIR("fdinfo", S_IRUSR|S_IXUSR, proc_fdinfo_inode_operations, proc_fdinfo_operations),
6b4e306a 3121 DIR("ns", S_IRUSR|S_IXUGO, proc_ns_dir_inode_operations, proc_ns_dir_operations),
631f9c18
AD		 3122 REG("environ", S_IRUSR, proc_environ_operations),
3123 INF("auxv", S_IRUSR, proc_pid_auxv),
3124 ONE("status", S_IRUGO, proc_pid_status),
a9712bc1 3125 ONE("personality", S_IRUGO, proc_pid_personality),
3036e7b4 3126 INF("limits", S_IRUGO, proc_pid_limits),
43ae34cb 3127#ifdef CONFIG_SCHED_DEBUG
631f9c18 3128 REG("sched", S_IRUGO|S_IWUSR, proc_pid_sched_operations),
ebcb6734 3129#endif
4614a696 3130 REG("comm", S_IRUGO|S_IWUSR, proc_pid_set_comm_operations),
ebcb6734 3131#ifdef CONFIG_HAVE_ARCH_TRACEHOOK
a9712bc1 3132 INF("syscall", S_IRUGO, proc_pid_syscall),
43ae34cb 3133#endif
631f9c18
AD		 3134 INF("cmdline", S_IRUGO, proc_pid_cmdline),
3135 ONE("stat", S_IRUGO, proc_tid_stat),
3136 ONE("statm", S_IRUGO, proc_pid_statm),
3137 REG("maps", S_IRUGO, proc_maps_operations),
28a6d671 3138#ifdef CONFIG_NUMA
631f9c18 3139 REG("numa_maps", S_IRUGO, proc_numa_maps_operations),
28a6d671 3140#endif
631f9c18
AD		 3141 REG("mem", S_IRUSR|S_IWUSR, proc_mem_operations),
3142 LNK("cwd", proc_cwd_link),
3143 LNK("root", proc_root_link),
3144 LNK("exe", proc_exe_link),
3145 REG("mounts", S_IRUGO, proc_mounts_operations),
3146 REG("mountinfo", S_IRUGO, proc_mountinfo_operations),
1e883281 3147#ifdef CONFIG_PROC_PAGE_MONITOR
631f9c18
AD		 3148 REG("clear_refs", S_IWUSR, proc_clear_refs_operations),
3149 REG("smaps", S_IRUGO, proc_smaps_operations),
ca6b0bf0 3150 REG("pagemap", S_IRUGO, proc_pagemap_operations),
28a6d671
EB		 3151#endif
3152#ifdef CONFIG_SECURITY
631f9c18 3153 DIR("attr", S_IRUGO|S_IXUGO, proc_attr_dir_inode_operations, proc_attr_dir_operations),
28a6d671
EB		 3154#endif
3155#ifdef CONFIG_KALLSYMS
631f9c18 3156 INF("wchan", S_IRUGO, proc_pid_wchan),
28a6d671 3157#endif
2ec220e2 3158#ifdef CONFIG_STACKTRACE
a9712bc1 3159 ONE("stack", S_IRUGO, proc_pid_stack),
28a6d671
EB		 3160#endif
3161#ifdef CONFIG_SCHEDSTATS
631f9c18 3162 INF("schedstat", S_IRUGO, proc_pid_schedstat),
28a6d671 3163#endif
9745512c 3164#ifdef CONFIG_LATENCYTOP
631f9c18 3165 REG("latency", S_IRUGO, proc_lstats_operations),
9745512c 3166#endif
8793d854 3167#ifdef CONFIG_PROC_PID_CPUSET
631f9c18 3168 REG("cpuset", S_IRUGO, proc_cpuset_operations),
a424316c
PM		 3169#endif
3170#ifdef CONFIG_CGROUPS
631f9c18 3171 REG("cgroup", S_IRUGO, proc_cgroup_operations),
28a6d671 3172#endif
631f9c18
AD		 3173 INF("oom_score", S_IRUGO, proc_oom_score),
3174 REG("oom_adj", S_IRUGO|S_IWUSR, proc_oom_adjust_operations),
a63d83f4 3175 REG("oom_score_adj", S_IRUGO|S_IWUSR, proc_oom_score_adj_operations),
28a6d671 3176#ifdef CONFIG_AUDITSYSCALL
631f9c18 3177 REG("loginuid", S_IWUSR|S_IRUGO, proc_loginuid_operations),
26ec3c64 3178 REG("sessionid", S_IRUGO, proc_sessionid_operations),
28a6d671 3179#endif
f4f154fd 3180#ifdef CONFIG_FAULT_INJECTION
631f9c18 3181 REG("make-it-fail", S_IRUGO|S_IWUSR, proc_fault_inject_operations),
f4f154fd 3182#endif
297c5d92 3183#ifdef CONFIG_TASK_IO_ACCOUNTING
631f9c18 3184 INF("io", S_IRUGO, proc_tid_io_accounting),
297c5d92 3185#endif
f133ecca
CM		 3186#ifdef CONFIG_HARDWALL
3187 INF("hardwall", S_IRUGO, proc_pid_hardwall),
3188#endif
28a6d671
EB		 3189};
3190
3191static int proc_tid_base_readdir(struct file * filp,
3192 void * dirent, filldir_t filldir)
3193{
3194 return proc_pident_readdir(filp,dirent,filldir,
3195 tid_base_stuff,ARRAY_SIZE(tid_base_stuff));
3196}
3197
3198static struct dentry *proc_tid_base_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd){
7bcd6b0e
EB		 3199 return proc_pident_lookup(dir, dentry,
3200 tid_base_stuff, ARRAY_SIZE(tid_base_stuff));
28a6d671
EB		 3201}
3202
00977a59 3203static const struct file_operations proc_tid_base_operations = {
28a6d671
EB		 3204 .read = generic_read_dir,
3205 .readdir = proc_tid_base_readdir,
6038f373 3206 .llseek = default_llseek,
28a6d671
EB		 3207};
3208
c5ef1c42 3209static const struct inode_operations proc_tid_base_inode_operations = {
28a6d671
EB		 3210 .lookup = proc_tid_base_lookup,
3211 .getattr = pid_getattr,
3212 .setattr = proc_setattr,
3213};
3214
444ceed8 3215static struct dentry *proc_task_instantiate(struct inode *dir,
c5141e6d 3216 struct dentry *dentry, struct task_struct *task, const void *ptr)
444ceed8
EB		 3217{
3218 struct dentry *error = ERR_PTR(-ENOENT);
3219 struct inode *inode;
61a28784 3220 inode = proc_pid_make_inode(dir->i_sb, task);
444ceed8
EB		 3221
3222 if (!inode)
3223 goto out;
3224 inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO;
3225 inode->i_op = &proc_tid_base_inode_operations;
3226 inode->i_fop = &proc_tid_base_operations;
3227 inode->i_flags|=S_IMMUTABLE;
aed54175
VN		 3228
3229 inode->i_nlink = 2 + pid_entry_count_dirs(tid_base_stuff,
3230 ARRAY_SIZE(tid_base_stuff));
444ceed8 3231
fb045adb 3232 d_set_d_op(dentry, &pid_dentry_operations);
444ceed8
EB		 3233
3234 d_add(dentry, inode);
3235 /* Close the race of the process dying before we return the dentry */
3236 if (pid_revalidate(dentry, NULL))
3237 error = NULL;
3238out:
3239 return error;
3240}
3241
28a6d671
EB		 3242static struct dentry *proc_task_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd)
3243{
3244 struct dentry *result = ERR_PTR(-ENOENT);
3245 struct task_struct *task;
3246 struct task_struct *leader = get_proc_task(dir);
28a6d671 3247 unsigned tid;
b488893a 3248 struct pid_namespace *ns;
28a6d671
EB		 3249
3250 if (!leader)
3251 goto out_no_task;
3252
3253 tid = name_to_int(dentry);
3254 if (tid == ~0U)
3255 goto out;
3256
b488893a 3257 ns = dentry->d_sb->s_fs_info;
28a6d671 3258 rcu_read_lock();
b488893a 3259 task = find_task_by_pid_ns(tid, ns);
28a6d671
EB		 3260 if (task)
3261 get_task_struct(task);
3262 rcu_read_unlock();
3263 if (!task)
3264 goto out;
bac0abd6 3265 if (!same_thread_group(leader, task))
28a6d671
EB		 3266 goto out_drop_task;
3267
444ceed8 3268 result = proc_task_instantiate(dir, dentry, task, NULL);
28a6d671
EB		 3269out_drop_task:
3270 put_task_struct(task);
3271out:
3272 put_task_struct(leader);
3273out_no_task:
3274 return result;
3275}
3276
0bc58a91
EB		 3277/*
3278 * Find the first tid of a thread group to return to user space.
3279 *
3280 * Usually this is just the thread group leader, but if the users
3281 * buffer was too small or there was a seek into the middle of the
3282 * directory we have more work todo.
3283 *
3284 * In the case of a short read we start with find_task_by_pid.
3285 *
3286 * In the case of a seek we start with the leader and walk nr
3287 * threads past it.
3288 */
cc288738 3289static struct task_struct *first_tid(struct task_struct *leader,
b488893a 3290 int tid, int nr, struct pid_namespace *ns)
0bc58a91 3291{
a872ff0c 3292 struct task_struct *pos;
1da177e4 3293
cc288738 3294 rcu_read_lock();
0bc58a91
EB		 3295 /* Attempt to start with the pid of a thread */
3296 if (tid && (nr > 0)) {
b488893a 3297 pos = find_task_by_pid_ns(tid, ns);
a872ff0c
ON		 3298 if (pos && (pos->group_leader == leader))
3299 goto found;
0bc58a91 3300 }
1da177e4 3301
0bc58a91 3302 /* If nr exceeds the number of threads there is nothing todo */
a872ff0c
ON		 3303 pos = NULL;
3304 if (nr && nr >= get_nr_threads(leader))
3305 goto out;
1da177e4 3306
a872ff0c
ON		 3307 /* If we haven't found our starting place yet start
3308 * with the leader and walk nr threads forward.
0bc58a91 3309 */
a872ff0c
ON		 3310 for (pos = leader; nr > 0; --nr) {
3311 pos = next_thread(pos);
3312 if (pos == leader) {
3313 pos = NULL;
3314 goto out;
3315 }
1da177e4 3316 }
a872ff0c
ON		 3317found:
3318 get_task_struct(pos);
3319out:
cc288738 3320 rcu_read_unlock();
0bc58a91
EB		 3321 return pos;
3322}
3323
3324/*
3325 * Find the next thread in the thread list.
3326 * Return NULL if there is an error or no next thread.
3327 *
3328 * The reference to the input task_struct is released.
3329 */
3330static struct task_struct *next_tid(struct task_struct *start)
3331{
c1df7fb8 3332 struct task_struct *pos = NULL;
cc288738 3333 rcu_read_lock();
c1df7fb8 3334 if (pid_alive(start)) {
0bc58a91 3335 pos = next_thread(start);
c1df7fb8
ON		 3336 if (thread_group_leader(pos))
3337 pos = NULL;
3338 else
3339 get_task_struct(pos);
3340 }
cc288738 3341 rcu_read_unlock();
0bc58a91
EB		 3342 put_task_struct(start);
3343 return pos;
1da177e4
LT		 3344}
3345
61a28784
EB		 3346static int proc_task_fill_cache(struct file *filp, void *dirent, filldir_t filldir,
3347 struct task_struct *task, int tid)
3348{
3349 char name[PROC_NUMBUF];
3350 int len = snprintf(name, sizeof(name), "%d", tid);
3351 return proc_fill_cache(filp, dirent, filldir, name, len,
3352 proc_task_instantiate, task, NULL);
3353}
3354
1da177e4
LT		 3355/* for the /proc/TGID/task/ directories */
3356static int proc_task_readdir(struct file * filp, void * dirent, filldir_t filldir)
3357{
2fddfeef 3358 struct dentry *dentry = filp->f_path.dentry;
1da177e4 3359 struct inode *inode = dentry->d_inode;
7d895244 3360 struct task_struct *leader = NULL;
0bc58a91 3361 struct task_struct *task;
1da177e4
LT		 3362 int retval = -ENOENT;
3363 ino_t ino;
0bc58a91 3364 int tid;
b488893a 3365 struct pid_namespace *ns;
1da177e4 3366
7d895244
GC		 3367 task = get_proc_task(inode);
3368 if (!task)
3369 goto out_no_task;
3370 rcu_read_lock();
3371 if (pid_alive(task)) {
3372 leader = task->group_leader;
3373 get_task_struct(leader);
3374 }
3375 rcu_read_unlock();
3376 put_task_struct(task);
99f89551
EB		 3377 if (!leader)
3378 goto out_no_task;
1da177e4
LT		 3379 retval = 0;
3380
ee568b25 3381 switch ((unsigned long)filp->f_pos) {
1da177e4
LT		 3382 case 0:
3383 ino = inode->i_ino;
ee6f779b 3384 if (filldir(dirent, ".", 1, filp->f_pos, ino, DT_DIR) < 0)
1da177e4 3385 goto out;
ee6f779b 3386 filp->f_pos++;
1da177e4
LT		 3387 /* fall through */
3388 case 1:
3389 ino = parent_ino(dentry);
ee6f779b 3390 if (filldir(dirent, "..", 2, filp->f_pos, ino, DT_DIR) < 0)
1da177e4 3391 goto out;
ee6f779b 3392 filp->f_pos++;
1da177e4
LT		 3393 /* fall through */
3394 }
3395
0bc58a91
EB		 3396 /* f_version caches the tgid value that the last readdir call couldn't
3397 * return. lseek aka telldir automagically resets f_version to 0.
3398 */
b488893a 3399 ns = filp->f_dentry->d_sb->s_fs_info;
2b47c361 3400 tid = (int)filp->f_version;
0bc58a91 3401 filp->f_version = 0;
ee6f779b 3402 for (task = first_tid(leader, tid, filp->f_pos - 2, ns);
0bc58a91 3403 task;
ee6f779b 3404 task = next_tid(task), filp->f_pos++) {
b488893a 3405 tid = task_pid_nr_ns(task, ns);
61a28784 3406 if (proc_task_fill_cache(filp, dirent, filldir, task, tid) < 0) {
0bc58a91
EB		 3407 /* returning this tgid failed, save it as the first
3408 * pid for the next readir call */
2b47c361 3409 filp->f_version = (u64)tid;
0bc58a91 3410 put_task_struct(task);
1da177e4 3411 break;
0bc58a91 3412 }
1da177e4
LT		 3413 }
3414out:
99f89551
EB		 3415 put_task_struct(leader);
3416out_no_task:
1da177e4
LT		 3417 return retval;
3418}
6e66b52b
EB		 3419
3420static int proc_task_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
3421{
3422 struct inode *inode = dentry->d_inode;
99f89551 3423 struct task_struct *p = get_proc_task(inode);
6e66b52b
EB		 3424 generic_fillattr(inode, stat);
3425
99f89551 3426 if (p) {
99f89551 3427 stat->nlink += get_nr_threads(p);
99f89551 3428 put_task_struct(p);
6e66b52b
EB		 3429 }
3430
3431 return 0;
3432}
28a6d671 3433
c5ef1c42 3434static const struct inode_operations proc_task_inode_operations = {
28a6d671
EB		 3435 .lookup = proc_task_lookup,
3436 .getattr = proc_task_getattr,
3437 .setattr = proc_setattr,
3438};
3439
00977a59 3440static const struct file_operations proc_task_operations = {
28a6d671
EB		 3441 .read = generic_read_dir,
3442 .readdir = proc_task_readdir,
6038f373 3443 .llseek = default_llseek,
28a6d671 3444};
kernel source for telekom puls (alcatel/mediatek)