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ASoC: Add fully_routed flag to Speyside machines
[deliverable/linux.git] / fs / proc / base.c
CommitLineData
1da177e4
LT		 1/*
2 * linux/fs/proc/base.c
3 *
4 * Copyright (C) 1991, 1992 Linus Torvalds
5 *
6 * proc base directory handling functions
7 *
8 * 1999, Al Viro. Rewritten. Now it covers the whole per-process part.
9 * Instead of using magical inumbers to determine the kind of object
10 * we allocate and fill in-core inodes upon lookup. They don't even
11 * go into icache. We cache the reference to task_struct upon lookup too.
12 * Eventually it should become a filesystem in its own. We don't use the
13 * rest of procfs anymore.
e070ad49
ML		 14 *
15 *
16 * Changelog:
17 * 17-Jan-2005
18 * Allan Bezerra
19 * Bruna Moreira <bruna.moreira@indt.org.br>
20 * Edjard Mota <edjard.mota@indt.org.br>
21 * Ilias Biris <ilias.biris@indt.org.br>
22 * Mauricio Lin <mauricio.lin@indt.org.br>
23 *
24 * Embedded Linux Lab - 10LE Instituto Nokia de Tecnologia - INdT
25 *
26 * A new process specific entry (smaps) included in /proc. It shows the
27 * size of rss for each memory area. The maps entry lacks information
28 * about physical memory size (rss) for each mapped file, i.e.,
29 * rss information for executables and library files.
30 * This additional information is useful for any tools that need to know
31 * about physical memory consumption for a process specific library.
32 *
33 * Changelog:
34 * 21-Feb-2005
35 * Embedded Linux Lab - 10LE Instituto Nokia de Tecnologia - INdT
36 * Pud inclusion in the page table walking.
37 *
38 * ChangeLog:
39 * 10-Mar-2005
40 * 10LE Instituto Nokia de Tecnologia - INdT:
41 * A better way to walks through the page table as suggested by Hugh Dickins.
42 *
43 * Simo Piiroinen <simo.piiroinen@nokia.com>:
44 * Smaps information related to shared, private, clean and dirty pages.
45 *
46 * Paul Mundt <paul.mundt@nokia.com>:
47 * Overall revision about smaps.
1da177e4
LT		 48 */
49
50#include <asm/uaccess.h>
51
1da177e4
LT		 52#include <linux/errno.h>
53#include <linux/time.h>
54#include <linux/proc_fs.h>
55#include <linux/stat.h>
5995477a 56#include <linux/task_io_accounting_ops.h>
1da177e4 57#include <linux/init.h>
16f7e0fe 58#include <linux/capability.h>
1da177e4 59#include <linux/file.h>
9f3acc31 60#include <linux/fdtable.h>
1da177e4
LT		 61#include <linux/string.h>
62#include <linux/seq_file.h>
63#include <linux/namei.h>
6b3286ed 64#include <linux/mnt_namespace.h>
1da177e4 65#include <linux/mm.h>
a63d83f4 66#include <linux/swap.h>
b835996f 67#include <linux/rcupdate.h>
1da177e4 68#include <linux/kallsyms.h>
2ec220e2 69#include <linux/stacktrace.h>
d85f50d5 70#include <linux/resource.h>
5096add8 71#include <linux/module.h>
1da177e4
LT		 72#include <linux/mount.h>
73#include <linux/security.h>
74#include <linux/ptrace.h>
0d094efe 75#include <linux/tracehook.h>
a424316c 76#include <linux/cgroup.h>
1da177e4
LT		 77#include <linux/cpuset.h>
78#include <linux/audit.h>
5addc5dd 79#include <linux/poll.h>
1651e14e 80#include <linux/nsproxy.h>
8ac773b4 81#include <linux/oom.h>
3cb4a0bb 82#include <linux/elf.h>
60347f67 83#include <linux/pid_namespace.h>
5ad4e53b 84#include <linux/fs_struct.h>
5a0e3ad6 85#include <linux/slab.h>
f133ecca
CM		 86#ifdef CONFIG_HARDWALL
87#include <asm/hardwall.h>
88#endif
1da177e4
LT		 89#include "internal.h"
90
0f2fe20f
EB		 91/* NOTE:
92 * Implementing inode permission operations in /proc is almost
93 * certainly an error. Permission checks need to happen during
94 * each system call not at open time. The reason is that most of
95 * what we wish to check for permissions in /proc varies at runtime.
96 *
97 * The classic example of a problem is opening file descriptors
98 * in /proc for a task before it execs a suid executable.
99 */
100
1da177e4 101struct pid_entry {
1da177e4 102 char *name;
c5141e6d 103 int len;
1da177e4 104 mode_t mode;
c5ef1c42 105 const struct inode_operations *iop;
00977a59 106 const struct file_operations *fop;
20cdc894 107 union proc_op op;
1da177e4
LT		 108};
109
61a28784 110#define NOD(NAME, MODE, IOP, FOP, OP) { \
20cdc894 111 .name = (NAME), \
c5141e6d 112 .len = sizeof(NAME) - 1, \
20cdc894
EB		 113 .mode = MODE, \
114 .iop = IOP, \
115 .fop = FOP, \
116 .op = OP, \
117}
118
631f9c18
AD		 119#define DIR(NAME, MODE, iops, fops) \
120 NOD(NAME, (S_IFDIR|(MODE)), &iops, &fops, {} )
121#define LNK(NAME, get_link) \
61a28784 122 NOD(NAME, (S_IFLNK|S_IRWXUGO), \
20cdc894 123 &proc_pid_link_inode_operations, NULL, \
631f9c18
AD		 124 { .proc_get_link = get_link } )
125#define REG(NAME, MODE, fops) \
126 NOD(NAME, (S_IFREG|(MODE)), NULL, &fops, {})
127#define INF(NAME, MODE, read) \
61a28784 128 NOD(NAME, (S_IFREG|(MODE)), \
20cdc894 129 NULL, &proc_info_file_operations, \
631f9c18
AD		 130 { .proc_read = read } )
131#define ONE(NAME, MODE, show) \
be614086
EB		 132 NOD(NAME, (S_IFREG|(MODE)), \
133 NULL, &proc_single_file_operations, \
631f9c18 134 { .proc_show = show } )
1da177e4 135
aed54175
VN		 136/*
137 * Count the number of hardlinks for the pid_entry table, excluding the .
138 * and .. links.
139 */
140static unsigned int pid_entry_count_dirs(const struct pid_entry *entries,
141 unsigned int n)
142{
143 unsigned int i;
144 unsigned int count;
145
146 count = 0;
147 for (i = 0; i < n; ++i) {
148 if (S_ISDIR(entries[i].mode))
149 ++count;
150 }
151
152 return count;
153}
154
f7ad3c6b 155static int get_task_root(struct task_struct *task, struct path *root)
1da177e4 156{
7c2c7d99
HD		 157 int result = -ENOENT;
158
0494f6ec 159 task_lock(task);
f7ad3c6b
MS		 160 if (task->fs) {
161 get_fs_root(task->fs, root);
7c2c7d99
HD		 162 result = 0;
163 }
0494f6ec 164 task_unlock(task);
7c2c7d99 165 return result;
0494f6ec
MS		 166}
167
3dcd25f3 168static int proc_cwd_link(struct inode *inode, struct path *path)
0494f6ec 169{
99f89551 170 struct task_struct *task = get_proc_task(inode);
0494f6ec 171 int result = -ENOENT;
99f89551
EB		 172
173 if (task) {
f7ad3c6b
MS		 174 task_lock(task);
175 if (task->fs) {
176 get_fs_pwd(task->fs, path);
177 result = 0;
178 }
179 task_unlock(task);
99f89551
EB		 180 put_task_struct(task);
181 }
1da177e4
LT		 182 return result;
183}
184
3dcd25f3 185static int proc_root_link(struct inode *inode, struct path *path)
1da177e4 186{
99f89551 187 struct task_struct *task = get_proc_task(inode);
1da177e4 188 int result = -ENOENT;
99f89551
EB		 189
190 if (task) {
f7ad3c6b 191 result = get_task_root(task, path);
99f89551
EB		 192 put_task_struct(task);
193 }
1da177e4
LT		 194 return result;
195}
196
8b0db9db 197static struct mm_struct *__check_mem_permission(struct task_struct *task)
638fa202 198{
8b0db9db
SW		 199 struct mm_struct *mm;
200
201 mm = get_task_mm(task);
202 if (!mm)
203 return ERR_PTR(-EINVAL);
204
638fa202
RM		 205 /*
206 * A task can always look at itself, in case it chooses
207 * to use system calls instead of load instructions.
208 */
209 if (task == current)
8b0db9db 210 return mm;
638fa202
RM		 211
212 /*
213 * If current is actively ptrace'ing, and would also be
214 * permitted to freshly attach with ptrace now, permit it.
215 */
0d094efe
RM		 216 if (task_is_stopped_or_traced(task)) {
217 int match;
218 rcu_read_lock();
06d98473 219 match = (ptrace_parent(task) == current);
0d094efe
RM		 220 rcu_read_unlock();
221 if (match && ptrace_may_access(task, PTRACE_MODE_ATTACH))
8b0db9db 222 return mm;
0d094efe 223 }
638fa202
RM		 224
225 /*
25985edc 226 * No one else is allowed.
638fa202 227 */
8b0db9db
SW		 228 mmput(mm);
229 return ERR_PTR(-EPERM);
638fa202 230}
1da177e4 231
18f661bc 232/*
8b0db9db
SW		 233 * If current may access user memory in @task return a reference to the
234 * corresponding mm, otherwise ERR_PTR.
18f661bc 235 */
8b0db9db 236static struct mm_struct *check_mem_permission(struct task_struct *task)
18f661bc 237{
8b0db9db 238 struct mm_struct *mm;
18f661bc
SW		 239 int err;
240
241 /*
242 * Avoid racing if task exec's as we might get a new mm but validate
243 * against old credentials.
244 */
245 err = mutex_lock_killable(&task->signal->cred_guard_mutex);
246 if (err)
8b0db9db 247 return ERR_PTR(err);
18f661bc 248
8b0db9db 249 mm = __check_mem_permission(task);
18f661bc
SW		 250 mutex_unlock(&task->signal->cred_guard_mutex);
251
8b0db9db 252 return mm;
638fa202 253}
1da177e4 254
831830b5
AV		 255struct mm_struct *mm_for_maps(struct task_struct *task)
256{
704b836c 257 struct mm_struct *mm;
ec6fd8a4 258 int err;
704b836c 259
ec6fd8a4
AV		 260 err = mutex_lock_killable(&task->signal->cred_guard_mutex);
261 if (err)
262 return ERR_PTR(err);
00f89d21 263
704b836c
ON		 264 mm = get_task_mm(task);
265 if (mm && mm != current->mm &&
266 !ptrace_may_access(task, PTRACE_MODE_READ)) {
267 mmput(mm);
ec6fd8a4 268 mm = ERR_PTR(-EACCES);
13f0feaf 269 }
9b1bf12d 270 mutex_unlock(&task->signal->cred_guard_mutex);
704b836c 271
831830b5 272 return mm;
831830b5
AV		 273}
274
1da177e4
LT		 275static int proc_pid_cmdline(struct task_struct *task, char * buffer)
276{
277 int res = 0;
278 unsigned int len;
279 struct mm_struct *mm = get_task_mm(task);
280 if (!mm)
281 goto out;
282 if (!mm->arg_end)
283 goto out_mm; /* Shh! No looking before we're done */
284
285 len = mm->arg_end - mm->arg_start;
286
287 if (len > PAGE_SIZE)
288 len = PAGE_SIZE;
289
290 res = access_process_vm(task, mm->arg_start, buffer, len, 0);
291
292 // If the nul at the end of args has been overwritten, then
293 // assume application is using setproctitle(3).
294 if (res > 0 && buffer[res-1] != '\0' && len < PAGE_SIZE) {
295 len = strnlen(buffer, res);
296 if (len < res) {
297 res = len;
298 } else {
299 len = mm->env_end - mm->env_start;
300 if (len > PAGE_SIZE - res)
301 len = PAGE_SIZE - res;
302 res += access_process_vm(task, mm->env_start, buffer+res, len, 0);
303 res = strnlen(buffer, res);
304 }
305 }
306out_mm:
307 mmput(mm);
308out:
309 return res;
310}
311
312static int proc_pid_auxv(struct task_struct *task, char *buffer)
313{
2fadaef4
AV		 314 struct mm_struct *mm = mm_for_maps(task);
315 int res = PTR_ERR(mm);
316 if (mm && !IS_ERR(mm)) {
1da177e4 317 unsigned int nwords = 0;
dfe6b7d9 318 do {
1da177e4 319 nwords += 2;
dfe6b7d9 320 } while (mm->saved_auxv[nwords - 2] != 0); /* AT_NULL */
1da177e4
LT		 321 res = nwords * sizeof(mm->saved_auxv[0]);
322 if (res > PAGE_SIZE)
323 res = PAGE_SIZE;
324 memcpy(buffer, mm->saved_auxv, res);
325 mmput(mm);
326 }
327 return res;
328}
329
330
331#ifdef CONFIG_KALLSYMS
332/*
333 * Provides a wchan file via kallsyms in a proper one-value-per-file format.
334 * Returns the resolved symbol. If that fails, simply return the address.
335 */
336static int proc_pid_wchan(struct task_struct *task, char *buffer)
337{
ffb45122 338 unsigned long wchan;
9281acea 339 char symname[KSYM_NAME_LEN];
1da177e4
LT		 340
341 wchan = get_wchan(task);
342
9d65cb4a 343 if (lookup_symbol_name(wchan, symname) < 0)
f83ce3e6
JE		 344 if (!ptrace_may_access(task, PTRACE_MODE_READ))
345 return 0;
346 else
347 return sprintf(buffer, "%lu", wchan);
9d65cb4a
AD		 348 else
349 return sprintf(buffer, "%s", symname);
1da177e4
LT		 350}
351#endif /* CONFIG_KALLSYMS */
352
a9712bc1
AV		 353static int lock_trace(struct task_struct *task)
354{
355 int err = mutex_lock_killable(&task->signal->cred_guard_mutex);
356 if (err)
357 return err;
358 if (!ptrace_may_access(task, PTRACE_MODE_ATTACH)) {
359 mutex_unlock(&task->signal->cred_guard_mutex);
360 return -EPERM;
361 }
362 return 0;
363}
364
365static void unlock_trace(struct task_struct *task)
366{
367 mutex_unlock(&task->signal->cred_guard_mutex);
368}
369
2ec220e2
KC		 370#ifdef CONFIG_STACKTRACE
371
372#define MAX_STACK_TRACE_DEPTH 64
373
374static int proc_pid_stack(struct seq_file *m, struct pid_namespace *ns,
375 struct pid *pid, struct task_struct *task)
376{
377 struct stack_trace trace;
378 unsigned long *entries;
a9712bc1 379 int err;
2ec220e2
KC		 380 int i;
381
382 entries = kmalloc(MAX_STACK_TRACE_DEPTH * sizeof(*entries), GFP_KERNEL);
383 if (!entries)
384 return -ENOMEM;
385
386 trace.nr_entries = 0;
387 trace.max_entries = MAX_STACK_TRACE_DEPTH;
388 trace.entries = entries;
389 trace.skip = 0;
2ec220e2 390
a9712bc1
AV		 391 err = lock_trace(task);
392 if (!err) {
393 save_stack_trace_tsk(task, &trace);
394
395 for (i = 0; i < trace.nr_entries; i++) {
b81a618d 396 seq_printf(m, "[<%pK>] %pS\n",
a9712bc1
AV		 397 (void *)entries[i], (void *)entries[i]);
398 }
399 unlock_trace(task);
2ec220e2
KC		 400 }
401 kfree(entries);
402
a9712bc1 403 return err;
2ec220e2
KC		 404}
405#endif
406
1da177e4
LT		 407#ifdef CONFIG_SCHEDSTATS
408/*
409 * Provides /proc/PID/schedstat
410 */
411static int proc_pid_schedstat(struct task_struct *task, char *buffer)
412{
172ba844 413 return sprintf(buffer, "%llu %llu %lu\n",
826e08b0
IM		 414 (unsigned long long)task->se.sum_exec_runtime,
415 (unsigned long long)task->sched_info.run_delay,
2d72376b 416 task->sched_info.pcount);
1da177e4
LT		 417}
418#endif
419
9745512c
AV		 420#ifdef CONFIG_LATENCYTOP
421static int lstats_show_proc(struct seq_file *m, void *v)
422{
423 int i;
13d77c37
HS		 424 struct inode *inode = m->private;
425 struct task_struct *task = get_proc_task(inode);
9745512c 426
13d77c37
HS		 427 if (!task)
428 return -ESRCH;
429 seq_puts(m, "Latency Top version : v0.1\n");
9745512c 430 for (i = 0; i < 32; i++) {
34e49d4f
JP		 431 struct latency_record *lr = &task->latency_record[i];
432 if (lr->backtrace[0]) {
9745512c 433 int q;
34e49d4f
JP		 434 seq_printf(m, "%i %li %li",
435 lr->count, lr->time, lr->max);
9745512c 436 for (q = 0; q < LT_BACKTRACEDEPTH; q++) {
34e49d4f
JP		 437 unsigned long bt = lr->backtrace[q];
438 if (!bt)
9745512c 439 break;
34e49d4f 440 if (bt == ULONG_MAX)
9745512c 441 break;
34e49d4f 442 seq_printf(m, " %ps", (void *)bt);
9745512c 443 }
9d6de12f 444 seq_putc(m, '\n');
9745512c
AV		 445 }
446
447 }
13d77c37 448 put_task_struct(task);
9745512c
AV		 449 return 0;
450}
451
452static int lstats_open(struct inode *inode, struct file *file)
453{
13d77c37 454 return single_open(file, lstats_show_proc, inode);
d6643d12
HS		 455}
456
9745512c
AV		 457static ssize_t lstats_write(struct file *file, const char __user *buf,
458 size_t count, loff_t *offs)
459{
13d77c37 460 struct task_struct *task = get_proc_task(file->f_dentry->d_inode);
9745512c 461
13d77c37
HS		 462 if (!task)
463 return -ESRCH;
9745512c 464 clear_all_latency_tracing(task);
13d77c37 465 put_task_struct(task);
9745512c
AV		 466
467 return count;
468}
469
470static const struct file_operations proc_lstats_operations = {
471 .open = lstats_open,
472 .read = seq_read,
473 .write = lstats_write,
474 .llseek = seq_lseek,
13d77c37 475 .release = single_release,
9745512c
AV		 476};
477
478#endif
479
1da177e4
LT		 480static int proc_oom_score(struct task_struct *task, char *buffer)
481{
b95c35e7 482 unsigned long points = 0;
1da177e4 483
19c5d45a 484 read_lock(&tasklist_lock);
b95c35e7 485 if (pid_alive(task))
a63d83f4
DR		 486 points = oom_badness(task, NULL, NULL,
487 totalram_pages + total_swap_pages);
19c5d45a 488 read_unlock(&tasklist_lock);
1da177e4
LT		 489 return sprintf(buffer, "%lu\n", points);
490}
491
d85f50d5
NH		 492struct limit_names {
493 char *name;
494 char *unit;
495};
496
497static const struct limit_names lnames[RLIM_NLIMITS] = {
cff4edb5 498 [RLIMIT_CPU] = {"Max cpu time", "seconds"},
d85f50d5
NH		 499 [RLIMIT_FSIZE] = {"Max file size", "bytes"},
500 [RLIMIT_DATA] = {"Max data size", "bytes"},
501 [RLIMIT_STACK] = {"Max stack size", "bytes"},
502 [RLIMIT_CORE] = {"Max core file size", "bytes"},
503 [RLIMIT_RSS] = {"Max resident set", "bytes"},
504 [RLIMIT_NPROC] = {"Max processes", "processes"},
505 [RLIMIT_NOFILE] = {"Max open files", "files"},
506 [RLIMIT_MEMLOCK] = {"Max locked memory", "bytes"},
507 [RLIMIT_AS] = {"Max address space", "bytes"},
508 [RLIMIT_LOCKS] = {"Max file locks", "locks"},
509 [RLIMIT_SIGPENDING] = {"Max pending signals", "signals"},
510 [RLIMIT_MSGQUEUE] = {"Max msgqueue size", "bytes"},
511 [RLIMIT_NICE] = {"Max nice priority", NULL},
512 [RLIMIT_RTPRIO] = {"Max realtime priority", NULL},
8808117c 513 [RLIMIT_RTTIME] = {"Max realtime timeout", "us"},
d85f50d5
NH		 514};
515
516/* Display limits for a process */
517static int proc_pid_limits(struct task_struct *task, char *buffer)
518{
519 unsigned int i;
520 int count = 0;
521 unsigned long flags;
522 char *bufptr = buffer;
523
524 struct rlimit rlim[RLIM_NLIMITS];
525
a6bebbc8 526 if (!lock_task_sighand(task, &flags))
d85f50d5 527 return 0;
d85f50d5
NH		 528 memcpy(rlim, task->signal->rlim, sizeof(struct rlimit) * RLIM_NLIMITS);
529 unlock_task_sighand(task, &flags);
d85f50d5
NH		 530
531 /*
532 * print the file header
533 */
534 count += sprintf(&bufptr[count], "%-25s %-20s %-20s %-10s\n",
535 "Limit", "Soft Limit", "Hard Limit", "Units");
536
537 for (i = 0; i < RLIM_NLIMITS; i++) {
538 if (rlim[i].rlim_cur == RLIM_INFINITY)
539 count += sprintf(&bufptr[count], "%-25s %-20s ",
540 lnames[i].name, "unlimited");
541 else
542 count += sprintf(&bufptr[count], "%-25s %-20lu ",
543 lnames[i].name, rlim[i].rlim_cur);
544
545 if (rlim[i].rlim_max == RLIM_INFINITY)
546 count += sprintf(&bufptr[count], "%-20s ", "unlimited");
547 else
548 count += sprintf(&bufptr[count], "%-20lu ",
549 rlim[i].rlim_max);
550
551 if (lnames[i].unit)
552 count += sprintf(&bufptr[count], "%-10s\n",
553 lnames[i].unit);
554 else
555 count += sprintf(&bufptr[count], "\n");
556 }
557
558 return count;
559}
560
ebcb6734
RM		 561#ifdef CONFIG_HAVE_ARCH_TRACEHOOK
562static int proc_pid_syscall(struct task_struct *task, char *buffer)
563{
564 long nr;
565 unsigned long args[6], sp, pc;
a9712bc1
AV		 566 int res = lock_trace(task);
567 if (res)
568 return res;
ebcb6734
RM		 569
570 if (task_current_syscall(task, &nr, args, 6, &sp, &pc))
a9712bc1
AV		 571 res = sprintf(buffer, "running\n");
572 else if (nr < 0)
573 res = sprintf(buffer, "%ld 0x%lx 0x%lx\n", nr, sp, pc);
574 else
575 res = sprintf(buffer,
ebcb6734
RM		 576 "%ld 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx\n",
577 nr,
578 args[0], args[1], args[2], args[3], args[4], args[5],
579 sp, pc);
a9712bc1
AV		 580 unlock_trace(task);
581 return res;
ebcb6734
RM		 582}
583#endif /* CONFIG_HAVE_ARCH_TRACEHOOK */
584
1da177e4
LT		 585/************************************************************************/
586/* Here the fs part begins */
587/************************************************************************/
588
589/* permission checks */
778c1144 590static int proc_fd_access_allowed(struct inode *inode)
1da177e4 591{
778c1144
EB		 592 struct task_struct *task;
593 int allowed = 0;
df26c40e
EB		 594 /* Allow access to a task's file descriptors if it is us or we
595 * may use ptrace attach to the process and find out that
596 * information.
778c1144
EB		 597 */
598 task = get_proc_task(inode);
df26c40e 599 if (task) {
006ebb40 600 allowed = ptrace_may_access(task, PTRACE_MODE_READ);
778c1144 601 put_task_struct(task);
df26c40e 602 }
778c1144 603 return allowed;
1da177e4
LT		 604}
605
6b4e306a 606int proc_setattr(struct dentry *dentry, struct iattr *attr)
6d76fa58
LT		 607{
608 int error;
609 struct inode *inode = dentry->d_inode;
610
611 if (attr->ia_valid & ATTR_MODE)
612 return -EPERM;
613
614 error = inode_change_ok(inode, attr);
1025774c
CH		 615 if (error)
616 return error;
617
618 if ((attr->ia_valid & ATTR_SIZE) &&
619 attr->ia_size != i_size_read(inode)) {
620 error = vmtruncate(inode, attr->ia_size);
621 if (error)
622 return error;
623 }
624
625 setattr_copy(inode, attr);
626 mark_inode_dirty(inode);
627 return 0;
6d76fa58
LT		 628}
629
c5ef1c42 630static const struct inode_operations proc_def_inode_operations = {
6d76fa58
LT		 631 .setattr = proc_setattr,
632};
633
a1a2c409
MS		 634static int mounts_open_common(struct inode *inode, struct file *file,
635 const struct seq_operations *op)
1da177e4 636{
99f89551 637 struct task_struct *task = get_proc_task(inode);
cf7b708c 638 struct nsproxy *nsp;
6b3286ed 639 struct mnt_namespace *ns = NULL;
a1a2c409 640 struct path root;
5addc5dd
AV		 641 struct proc_mounts *p;
642 int ret = -EINVAL;
1da177e4 643
99f89551 644 if (task) {
cf7b708c
PE		 645 rcu_read_lock();
646 nsp = task_nsproxy(task);
647 if (nsp) {
648 ns = nsp->mnt_ns;
863c4702
AD		 649 if (ns)
650 get_mnt_ns(ns);
651 }
cf7b708c 652 rcu_read_unlock();
f7ad3c6b 653 if (ns && get_task_root(task, &root) == 0)
7c2c7d99 654 ret = 0;
99f89551
EB		 655 put_task_struct(task);
656 }
5addc5dd 657
a1a2c409
MS		 658 if (!ns)
659 goto err;
7c2c7d99 660 if (ret)
a1a2c409
MS		 661 goto err_put_ns;
662
a1a2c409
MS		 663 ret = -ENOMEM;
664 p = kmalloc(sizeof(struct proc_mounts), GFP_KERNEL);
665 if (!p)
666 goto err_put_path;
667
668 file->private_data = &p->m;
669 ret = seq_open(file, op);
670 if (ret)
671 goto err_free;
672
673 p->m.private = p;
674 p->ns = ns;
675 p->root = root;
f1514638 676 p->m.poll_event = ns->event;
a1a2c409
MS		 677
678 return 0;
679
680 err_free:
681 kfree(p);
682 err_put_path:
683 path_put(&root);
684 err_put_ns:
685 put_mnt_ns(ns);
686 err:
1da177e4
LT		 687 return ret;
688}
689
690static int mounts_release(struct inode *inode, struct file *file)
691{
a1a2c409
MS		 692 struct proc_mounts *p = file->private_data;
693 path_put(&p->root);
694 put_mnt_ns(p->ns);
1da177e4
LT		 695 return seq_release(inode, file);
696}
697
5addc5dd
AV		 698static unsigned mounts_poll(struct file *file, poll_table *wait)
699{
700 struct proc_mounts *p = file->private_data;
31b07093 701 unsigned res = POLLIN | POLLRDNORM;
5addc5dd 702
9f5596af
AV		 703 poll_wait(file, &p->ns->poll, wait);
704 if (mnt_had_events(p))
31b07093 705 res |= POLLERR | POLLPRI;
5addc5dd
AV		 706
707 return res;
708}
709
a1a2c409
MS		 710static int mounts_open(struct inode *inode, struct file *file)
711{
712 return mounts_open_common(inode, file, &mounts_op);
713}
714
00977a59 715static const struct file_operations proc_mounts_operations = {
1da177e4
LT		 716 .open = mounts_open,
717 .read = seq_read,
718 .llseek = seq_lseek,
719 .release = mounts_release,
5addc5dd 720 .poll = mounts_poll,
1da177e4
LT		 721};
722
2d4d4864
RP		 723static int mountinfo_open(struct inode *inode, struct file *file)
724{
725 return mounts_open_common(inode, file, &mountinfo_op);
726}
727
728static const struct file_operations proc_mountinfo_operations = {
729 .open = mountinfo_open,
730 .read = seq_read,
731 .llseek = seq_lseek,
732 .release = mounts_release,
733 .poll = mounts_poll,
734};
735
b4629fe2
CL		 736static int mountstats_open(struct inode *inode, struct file *file)
737{
a1a2c409 738 return mounts_open_common(inode, file, &mountstats_op);
b4629fe2
CL		 739}
740
00977a59 741static const struct file_operations proc_mountstats_operations = {
b4629fe2
CL		 742 .open = mountstats_open,
743 .read = seq_read,
744 .llseek = seq_lseek,
745 .release = mounts_release,
746};
747
1da177e4
LT		 748#define PROC_BLOCK_SIZE (3*1024) /* 4K page size but our output routines use some slack for overruns */
749
750static ssize_t proc_info_read(struct file * file, char __user * buf,
751 size_t count, loff_t *ppos)
752{
2fddfeef 753 struct inode * inode = file->f_path.dentry->d_inode;
1da177e4
LT		 754 unsigned long page;
755 ssize_t length;
99f89551
EB		 756 struct task_struct *task = get_proc_task(inode);
757
758 length = -ESRCH;
759 if (!task)
760 goto out_no_task;
1da177e4
LT		 761
762 if (count > PROC_BLOCK_SIZE)
763 count = PROC_BLOCK_SIZE;
99f89551
EB		 764
765 length = -ENOMEM;
e12ba74d 766 if (!(page = __get_free_page(GFP_TEMPORARY)))
99f89551 767 goto out;
1da177e4
LT		 768
769 length = PROC_I(inode)->op.proc_read(task, (char*)page);
770
771 if (length >= 0)
772 length = simple_read_from_buffer(buf, count, ppos, (char *)page, length);
773 free_page(page);
99f89551
EB		 774out:
775 put_task_struct(task);
776out_no_task:
1da177e4
LT		 777 return length;
778}
779
00977a59 780static const struct file_operations proc_info_file_operations = {
1da177e4 781 .read = proc_info_read,
87df8424 782 .llseek = generic_file_llseek,
1da177e4
LT		 783};
784
be614086
EB		 785static int proc_single_show(struct seq_file *m, void *v)
786{
787 struct inode *inode = m->private;
788 struct pid_namespace *ns;
789 struct pid *pid;
790 struct task_struct *task;
791 int ret;
792
793 ns = inode->i_sb->s_fs_info;
794 pid = proc_pid(inode);
795 task = get_pid_task(pid, PIDTYPE_PID);
796 if (!task)
797 return -ESRCH;
798
799 ret = PROC_I(inode)->op.proc_show(m, ns, pid, task);
800
801 put_task_struct(task);
802 return ret;
803}
804
805static int proc_single_open(struct inode *inode, struct file *filp)
806{
c6a34058 807 return single_open(filp, proc_single_show, inode);
be614086
EB		 808}
809
810static const struct file_operations proc_single_file_operations = {
811 .open = proc_single_open,
812 .read = seq_read,
813 .llseek = seq_lseek,
814 .release = single_release,
815};
816
1da177e4
LT		 817static int mem_open(struct inode* inode, struct file* file)
818{
819 file->private_data = (void*)((long)current->self_exec_id);
4a3956c7
KH		 820 /* OK to pass negative loff_t, we can catch out-of-range */
821 file->f_mode |= FMODE_UNSIGNED_OFFSET;
1da177e4
LT		 822 return 0;
823}
824
825static ssize_t mem_read(struct file * file, char __user * buf,
826 size_t count, loff_t *ppos)
827{
2fddfeef 828 struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode);
1da177e4
LT		 829 char *page;
830 unsigned long src = *ppos;
831 int ret = -ESRCH;
832 struct mm_struct *mm;
833
99f89551
EB		 834 if (!task)
835 goto out_no_task;
836
1da177e4 837 ret = -ENOMEM;
e12ba74d 838 page = (char *)__get_free_page(GFP_TEMPORARY);
1da177e4
LT		 839 if (!page)
840 goto out;
841
8b0db9db
SW		 842 mm = check_mem_permission(task);
843 ret = PTR_ERR(mm);
844 if (IS_ERR(mm))
1da177e4
LT		 845 goto out_free;
846
847 ret = -EIO;
848
849 if (file->private_data != (void*)((long)current->self_exec_id))
850 goto out_put;
851
852 ret = 0;
853
854 while (count > 0) {
855 int this_len, retval;
856
857 this_len = (count > PAGE_SIZE) ? PAGE_SIZE : count;
8b0db9db
SW		 858 retval = access_remote_vm(mm, src, page, this_len, 0);
859 if (!retval) {
1da177e4
LT		 860 if (!ret)
861 ret = -EIO;
862 break;
863 }
864
865 if (copy_to_user(buf, page, retval)) {
866 ret = -EFAULT;
867 break;
868 }
869
870 ret += retval;
871 src += retval;
872 buf += retval;
873 count -= retval;
874 }
875 *ppos = src;
876
877out_put:
878 mmput(mm);
879out_free:
880 free_page((unsigned long) page);
881out:
99f89551
EB		 882 put_task_struct(task);
883out_no_task:
1da177e4
LT		 884 return ret;
885}
886
63967fa9 887static ssize_t mem_write(struct file * file, const char __user *buf,
1da177e4
LT		 888 size_t count, loff_t *ppos)
889{
f7ca54f4 890 int copied;
1da177e4 891 char *page;
2fddfeef 892 struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode);
1da177e4 893 unsigned long dst = *ppos;
8b0db9db 894 struct mm_struct *mm;
1da177e4 895
99f89551
EB		 896 copied = -ESRCH;
897 if (!task)
898 goto out_no_task;
899
30cd8903
KM		 900 copied = -ENOMEM;
901 page = (char *)__get_free_page(GFP_TEMPORARY);
902 if (!page)
903 goto out_task;
904
8b0db9db
SW		 905 mm = check_mem_permission(task);
906 copied = PTR_ERR(mm);
907 if (IS_ERR(mm))
30cd8903 908 goto out_free;
1da177e4 909
26947f8c
SW		 910 copied = -EIO;
911 if (file->private_data != (void *)((long)current->self_exec_id))
8b0db9db 912 goto out_mm;
1da177e4 913
f7ca54f4 914 copied = 0;
1da177e4
LT		 915 while (count > 0) {
916 int this_len, retval;
917
918 this_len = (count > PAGE_SIZE) ? PAGE_SIZE : count;
919 if (copy_from_user(page, buf, this_len)) {
920 copied = -EFAULT;
921 break;
922 }
8b0db9db 923 retval = access_remote_vm(mm, dst, page, this_len, 1);
1da177e4
LT		 924 if (!retval) {
925 if (!copied)
926 copied = -EIO;
927 break;
928 }
929 copied += retval;
930 buf += retval;
931 dst += retval;
932 count -= retval;
933 }
934 *ppos = dst;
30cd8903 935
8b0db9db
SW		 936out_mm:
937 mmput(mm);
30cd8903
KM		 938out_free:
939 free_page((unsigned long) page);
8b0db9db 940out_task:
99f89551
EB		 941 put_task_struct(task);
942out_no_task:
1da177e4
LT		 943 return copied;
944}
1da177e4 945
85863e47 946loff_t mem_lseek(struct file *file, loff_t offset, int orig)
1da177e4
LT		 947{
948 switch (orig) {
949 case 0:
950 file->f_pos = offset;
951 break;
952 case 1:
953 file->f_pos += offset;
954 break;
955 default:
956 return -EINVAL;
957 }
958 force_successful_syscall_return();
959 return file->f_pos;
960}
961
00977a59 962static const struct file_operations proc_mem_operations = {
1da177e4
LT		 963 .llseek = mem_lseek,
964 .read = mem_read,
965 .write = mem_write,
966 .open = mem_open,
967};
968
315e28c8
JP		 969static ssize_t environ_read(struct file *file, char __user *buf,
970 size_t count, loff_t *ppos)
971{
972 struct task_struct *task = get_proc_task(file->f_dentry->d_inode);
973 char *page;
974 unsigned long src = *ppos;
975 int ret = -ESRCH;
976 struct mm_struct *mm;
977
978 if (!task)
979 goto out_no_task;
980
315e28c8
JP		 981 ret = -ENOMEM;
982 page = (char *)__get_free_page(GFP_TEMPORARY);
983 if (!page)
984 goto out;
985
315e28c8 986
d6f64b89
AV		 987 mm = mm_for_maps(task);
988 ret = PTR_ERR(mm);
989 if (!mm || IS_ERR(mm))
315e28c8
JP		 990 goto out_free;
991
d6f64b89 992 ret = 0;
315e28c8
JP		 993 while (count > 0) {
994 int this_len, retval, max_len;
995
996 this_len = mm->env_end - (mm->env_start + src);
997
998 if (this_len <= 0)
999 break;
1000
1001 max_len = (count > PAGE_SIZE) ? PAGE_SIZE : count;
1002 this_len = (this_len > max_len) ? max_len : this_len;
1003
1004 retval = access_process_vm(task, (mm->env_start + src),
1005 page, this_len, 0);
1006
1007 if (retval <= 0) {
1008 ret = retval;
1009 break;
1010 }
1011
1012 if (copy_to_user(buf, page, retval)) {
1013 ret = -EFAULT;
1014 break;
1015 }
1016
1017 ret += retval;
1018 src += retval;
1019 buf += retval;
1020 count -= retval;
1021 }
1022 *ppos = src;
1023
1024 mmput(mm);
1025out_free:
1026 free_page((unsigned long) page);
1027out:
1028 put_task_struct(task);
1029out_no_task:
1030 return ret;
1031}
1032
1033static const struct file_operations proc_environ_operations = {
1034 .read = environ_read,
87df8424 1035 .llseek = generic_file_llseek,
315e28c8
JP		 1036};
1037
1da177e4
LT		 1038static ssize_t oom_adjust_read(struct file *file, char __user *buf,
1039 size_t count, loff_t *ppos)
1040{
2fddfeef 1041 struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode);
8578cea7 1042 char buffer[PROC_NUMBUF];
1da177e4 1043 size_t len;
28b83c51
KM		 1044 int oom_adjust = OOM_DISABLE;
1045 unsigned long flags;
1da177e4 1046
99f89551
EB		 1047 if (!task)
1048 return -ESRCH;
28b83c51
KM		 1049
1050 if (lock_task_sighand(task, &flags)) {
1051 oom_adjust = task->signal->oom_adj;
1052 unlock_task_sighand(task, &flags);
1053 }
1054
99f89551
EB		 1055 put_task_struct(task);
1056
8578cea7 1057 len = snprintf(buffer, sizeof(buffer), "%i\n", oom_adjust);
0c28f287
AM		 1058
1059 return simple_read_from_buffer(buf, count, ppos, buffer, len);
1da177e4
LT		 1060}
1061
1062static ssize_t oom_adjust_write(struct file *file, const char __user *buf,
1063 size_t count, loff_t *ppos)
1064{
99f89551 1065 struct task_struct *task;
5d863b89 1066 char buffer[PROC_NUMBUF];
0a8cb8e3 1067 int oom_adjust;
28b83c51 1068 unsigned long flags;
5d863b89 1069 int err;
1da177e4 1070
8578cea7
EB		 1071 memset(buffer, 0, sizeof(buffer));
1072 if (count > sizeof(buffer) - 1)
1073 count = sizeof(buffer) - 1;
723548bf
DR		 1074 if (copy_from_user(buffer, buf, count)) {
1075 err = -EFAULT;
1076 goto out;
1077 }
5d863b89 1078
0a8cb8e3 1079 err = kstrtoint(strstrip(buffer), 0, &oom_adjust);
5d863b89 1080 if (err)
723548bf 1081 goto out;
8ac773b4 1082 if ((oom_adjust < OOM_ADJUST_MIN || oom_adjust > OOM_ADJUST_MAX) &&
723548bf
DR		 1083 oom_adjust != OOM_DISABLE) {
1084 err = -EINVAL;
1085 goto out;
1086 }
5d863b89 1087
2fddfeef 1088 task = get_proc_task(file->f_path.dentry->d_inode);
723548bf
DR		 1089 if (!task) {
1090 err = -ESRCH;
1091 goto out;
1092 }
d19d5476
DR		 1093
1094 task_lock(task);
1095 if (!task->mm) {
1096 err = -EINVAL;
1097 goto err_task_lock;
1098 }
1099
28b83c51 1100 if (!lock_task_sighand(task, &flags)) {
723548bf 1101 err = -ESRCH;
d19d5476 1102 goto err_task_lock;
28b83c51
KM		 1103 }
1104
1105 if (oom_adjust < task->signal->oom_adj && !capable(CAP_SYS_RESOURCE)) {
723548bf
DR		 1106 err = -EACCES;
1107 goto err_sighand;
8fb4fc68 1108 }
28b83c51 1109
51b1bd2a
DR		 1110 /*
1111 * Warn that /proc/pid/oom_adj is deprecated, see
1112 * Documentation/feature-removal-schedule.txt.
1113 */
c2142704 1114 printk_once(KERN_WARNING "%s (%d): /proc/%d/oom_adj is deprecated, please use /proc/%d/oom_score_adj instead.\n",
be8f684d
DR		 1115 current->comm, task_pid_nr(current), task_pid_nr(task),
1116 task_pid_nr(task));
28b83c51 1117 task->signal->oom_adj = oom_adjust;
a63d83f4
DR		 1118 /*
1119 * Scale /proc/pid/oom_score_adj appropriately ensuring that a maximum
1120 * value is always attainable.
1121 */
1122 if (task->signal->oom_adj == OOM_ADJUST_MAX)
1123 task->signal->oom_score_adj = OOM_SCORE_ADJ_MAX;
1124 else
1125 task->signal->oom_score_adj = (oom_adjust * OOM_SCORE_ADJ_MAX) /
1126 -OOM_DISABLE;
723548bf 1127err_sighand:
28b83c51 1128 unlock_task_sighand(task, &flags);
d19d5476
DR		 1129err_task_lock:
1130 task_unlock(task);
99f89551 1131 put_task_struct(task);
723548bf
DR		 1132out:
1133 return err < 0 ? err : count;
1da177e4
LT		 1134}
1135
00977a59 1136static const struct file_operations proc_oom_adjust_operations = {
1da177e4
LT		 1137 .read = oom_adjust_read,
1138 .write = oom_adjust_write,
87df8424 1139 .llseek = generic_file_llseek,
1da177e4
LT		 1140};
1141
a63d83f4
DR		 1142static ssize_t oom_score_adj_read(struct file *file, char __user *buf,
1143 size_t count, loff_t *ppos)
1144{
1145 struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode);
1146 char buffer[PROC_NUMBUF];
1147 int oom_score_adj = OOM_SCORE_ADJ_MIN;
1148 unsigned long flags;
1149 size_t len;
1150
1151 if (!task)
1152 return -ESRCH;
1153 if (lock_task_sighand(task, &flags)) {
1154 oom_score_adj = task->signal->oom_score_adj;
1155 unlock_task_sighand(task, &flags);
1156 }
1157 put_task_struct(task);
1158 len = snprintf(buffer, sizeof(buffer), "%d\n", oom_score_adj);
1159 return simple_read_from_buffer(buf, count, ppos, buffer, len);
1160}
1161
1162static ssize_t oom_score_adj_write(struct file *file, const char __user *buf,
1163 size_t count, loff_t *ppos)
1164{
1165 struct task_struct *task;
1166 char buffer[PROC_NUMBUF];
1167 unsigned long flags;
0a8cb8e3 1168 int oom_score_adj;
a63d83f4
DR		 1169 int err;
1170
1171 memset(buffer, 0, sizeof(buffer));
1172 if (count > sizeof(buffer) - 1)
1173 count = sizeof(buffer) - 1;
723548bf
DR		 1174 if (copy_from_user(buffer, buf, count)) {
1175 err = -EFAULT;
1176 goto out;
1177 }
a63d83f4 1178
0a8cb8e3 1179 err = kstrtoint(strstrip(buffer), 0, &oom_score_adj);
a63d83f4 1180 if (err)
723548bf 1181 goto out;
a63d83f4 1182 if (oom_score_adj < OOM_SCORE_ADJ_MIN ||
723548bf
DR		 1183 oom_score_adj > OOM_SCORE_ADJ_MAX) {
1184 err = -EINVAL;
1185 goto out;
1186 }
a63d83f4
DR		 1187
1188 task = get_proc_task(file->f_path.dentry->d_inode);
723548bf
DR		 1189 if (!task) {
1190 err = -ESRCH;
1191 goto out;
1192 }
d19d5476
DR		 1193
1194 task_lock(task);
1195 if (!task->mm) {
1196 err = -EINVAL;
1197 goto err_task_lock;
1198 }
1199
a63d83f4 1200 if (!lock_task_sighand(task, &flags)) {
723548bf 1201 err = -ESRCH;
d19d5476 1202 goto err_task_lock;
a63d83f4 1203 }
d19d5476 1204
dabb16f6 1205 if (oom_score_adj < task->signal->oom_score_adj_min &&
a63d83f4 1206 !capable(CAP_SYS_RESOURCE)) {
723548bf
DR		 1207 err = -EACCES;
1208 goto err_sighand;
a63d83f4
DR		 1209 }
1210
1211 task->signal->oom_score_adj = oom_score_adj;
dabb16f6
MSB		 1212 if (has_capability_noaudit(current, CAP_SYS_RESOURCE))
1213 task->signal->oom_score_adj_min = oom_score_adj;
a63d83f4
DR		 1214 /*
1215 * Scale /proc/pid/oom_adj appropriately ensuring that OOM_DISABLE is
1216 * always attainable.
1217 */
1218 if (task->signal->oom_score_adj == OOM_SCORE_ADJ_MIN)
1219 task->signal->oom_adj = OOM_DISABLE;
1220 else
1221 task->signal->oom_adj = (oom_score_adj * OOM_ADJUST_MAX) /
1222 OOM_SCORE_ADJ_MAX;
723548bf 1223err_sighand:
a63d83f4 1224 unlock_task_sighand(task, &flags);
d19d5476
DR		 1225err_task_lock:
1226 task_unlock(task);
a63d83f4 1227 put_task_struct(task);
723548bf
DR		 1228out:
1229 return err < 0 ? err : count;
a63d83f4
DR		 1230}
1231
1232static const struct file_operations proc_oom_score_adj_operations = {
1233 .read = oom_score_adj_read,
1234 .write = oom_score_adj_write,
6038f373 1235 .llseek = default_llseek,
a63d83f4
DR		 1236};
1237
1da177e4
LT		 1238#ifdef CONFIG_AUDITSYSCALL
1239#define TMPBUFLEN 21
1240static ssize_t proc_loginuid_read(struct file * file, char __user * buf,
1241 size_t count, loff_t *ppos)
1242{
2fddfeef 1243 struct inode * inode = file->f_path.dentry->d_inode;
99f89551 1244 struct task_struct *task = get_proc_task(inode);
1da177e4
LT		 1245 ssize_t length;
1246 char tmpbuf[TMPBUFLEN];
1247
99f89551
EB		 1248 if (!task)
1249 return -ESRCH;
1da177e4 1250 length = scnprintf(tmpbuf, TMPBUFLEN, "%u",
0c11b942 1251 audit_get_loginuid(task));
99f89551 1252 put_task_struct(task);
1da177e4
LT		 1253 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1254}
1255
1256static ssize_t proc_loginuid_write(struct file * file, const char __user * buf,
1257 size_t count, loff_t *ppos)
1258{
2fddfeef 1259 struct inode * inode = file->f_path.dentry->d_inode;
1da177e4
LT		 1260 char *page, *tmp;
1261 ssize_t length;
1da177e4
LT		 1262 uid_t loginuid;
1263
1264 if (!capable(CAP_AUDIT_CONTROL))
1265 return -EPERM;
1266
7dc52157
PM		 1267 rcu_read_lock();
1268 if (current != pid_task(proc_pid(inode), PIDTYPE_PID)) {
1269 rcu_read_unlock();
1da177e4 1270 return -EPERM;
7dc52157
PM		 1271 }
1272 rcu_read_unlock();
1da177e4 1273
e0182909
AV		 1274 if (count >= PAGE_SIZE)
1275 count = PAGE_SIZE - 1;
1da177e4
LT		 1276
1277 if (*ppos != 0) {
1278 /* No partial writes. */
1279 return -EINVAL;
1280 }
e12ba74d 1281 page = (char*)__get_free_page(GFP_TEMPORARY);
1da177e4
LT		 1282 if (!page)
1283 return -ENOMEM;
1284 length = -EFAULT;
1285 if (copy_from_user(page, buf, count))
1286 goto out_free_page;
1287
e0182909 1288 page[count] = '\0';
1da177e4
LT		 1289 loginuid = simple_strtoul(page, &tmp, 10);
1290 if (tmp == page) {
1291 length = -EINVAL;
1292 goto out_free_page;
1293
1294 }
99f89551 1295 length = audit_set_loginuid(current, loginuid);
1da177e4
LT		 1296 if (likely(length == 0))
1297 length = count;
1298
1299out_free_page:
1300 free_page((unsigned long) page);
1301 return length;
1302}
1303
00977a59 1304static const struct file_operations proc_loginuid_operations = {
1da177e4
LT		 1305 .read = proc_loginuid_read,
1306 .write = proc_loginuid_write,
87df8424 1307 .llseek = generic_file_llseek,
1da177e4 1308};
1e0bd755
EP		 1309
1310static ssize_t proc_sessionid_read(struct file * file, char __user * buf,
1311 size_t count, loff_t *ppos)
1312{
1313 struct inode * inode = file->f_path.dentry->d_inode;
1314 struct task_struct *task = get_proc_task(inode);
1315 ssize_t length;
1316 char tmpbuf[TMPBUFLEN];
1317
1318 if (!task)
1319 return -ESRCH;
1320 length = scnprintf(tmpbuf, TMPBUFLEN, "%u",
1321 audit_get_sessionid(task));
1322 put_task_struct(task);
1323 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1324}
1325
1326static const struct file_operations proc_sessionid_operations = {
1327 .read = proc_sessionid_read,
87df8424 1328 .llseek = generic_file_llseek,
1e0bd755 1329};
1da177e4
LT		 1330#endif
1331
f4f154fd
AM		 1332#ifdef CONFIG_FAULT_INJECTION
1333static ssize_t proc_fault_inject_read(struct file * file, char __user * buf,
1334 size_t count, loff_t *ppos)
1335{
1336 struct task_struct *task = get_proc_task(file->f_dentry->d_inode);
1337 char buffer[PROC_NUMBUF];
1338 size_t len;
1339 int make_it_fail;
f4f154fd
AM		 1340
1341 if (!task)
1342 return -ESRCH;
1343 make_it_fail = task->make_it_fail;
1344 put_task_struct(task);
1345
1346 len = snprintf(buffer, sizeof(buffer), "%i\n", make_it_fail);
0c28f287
AM		 1347
1348 return simple_read_from_buffer(buf, count, ppos, buffer, len);
f4f154fd
AM		 1349}
1350
1351static ssize_t proc_fault_inject_write(struct file * file,
1352 const char __user * buf, size_t count, loff_t *ppos)
1353{
1354 struct task_struct *task;
1355 char buffer[PROC_NUMBUF], *end;
1356 int make_it_fail;
1357
1358 if (!capable(CAP_SYS_RESOURCE))
1359 return -EPERM;
1360 memset(buffer, 0, sizeof(buffer));
1361 if (count > sizeof(buffer) - 1)
1362 count = sizeof(buffer) - 1;
1363 if (copy_from_user(buffer, buf, count))
1364 return -EFAULT;
cba8aafe
VL		 1365 make_it_fail = simple_strtol(strstrip(buffer), &end, 0);
1366 if (*end)
1367 return -EINVAL;
f4f154fd
AM		 1368 task = get_proc_task(file->f_dentry->d_inode);
1369 if (!task)
1370 return -ESRCH;
1371 task->make_it_fail = make_it_fail;
1372 put_task_struct(task);
cba8aafe
VL		 1373
1374 return count;
f4f154fd
AM		 1375}
1376
00977a59 1377static const struct file_operations proc_fault_inject_operations = {
f4f154fd
AM		 1378 .read = proc_fault_inject_read,
1379 .write = proc_fault_inject_write,
87df8424 1380 .llseek = generic_file_llseek,
f4f154fd
AM		 1381};
1382#endif
1383
9745512c 1384
43ae34cb
IM		 1385#ifdef CONFIG_SCHED_DEBUG
1386/*
1387 * Print out various scheduling related per-task fields:
1388 */
1389static int sched_show(struct seq_file *m, void *v)
1390{
1391 struct inode *inode = m->private;
1392 struct task_struct *p;
1393
43ae34cb
IM		 1394 p = get_proc_task(inode);
1395 if (!p)
1396 return -ESRCH;
1397 proc_sched_show_task(p, m);
1398
1399 put_task_struct(p);
1400
1401 return 0;
1402}
1403
1404static ssize_t
1405sched_write(struct file *file, const char __user *buf,
1406 size_t count, loff_t *offset)
1407{
1408 struct inode *inode = file->f_path.dentry->d_inode;
1409 struct task_struct *p;
1410
43ae34cb
IM		 1411 p = get_proc_task(inode);
1412 if (!p)
1413 return -ESRCH;
1414 proc_sched_set_task(p);
1415
1416 put_task_struct(p);
1417
1418 return count;
1419}
1420
1421static int sched_open(struct inode *inode, struct file *filp)
1422{
c6a34058 1423 return single_open(filp, sched_show, inode);
43ae34cb
IM		 1424}
1425
1426static const struct file_operations proc_pid_sched_operations = {
1427 .open = sched_open,
1428 .read = seq_read,
1429 .write = sched_write,
1430 .llseek = seq_lseek,
5ea473a1 1431 .release = single_release,
43ae34cb
IM		 1432};
1433
1434#endif
1435
5091faa4
MG		 1436#ifdef CONFIG_SCHED_AUTOGROUP
1437/*
1438 * Print out autogroup related information:
1439 */
1440static int sched_autogroup_show(struct seq_file *m, void *v)
1441{
1442 struct inode *inode = m->private;
1443 struct task_struct *p;
1444
1445 p = get_proc_task(inode);
1446 if (!p)
1447 return -ESRCH;
1448 proc_sched_autogroup_show_task(p, m);
1449
1450 put_task_struct(p);
1451
1452 return 0;
1453}
1454
1455static ssize_t
1456sched_autogroup_write(struct file *file, const char __user *buf,
1457 size_t count, loff_t *offset)
1458{
1459 struct inode *inode = file->f_path.dentry->d_inode;
1460 struct task_struct *p;
1461 char buffer[PROC_NUMBUF];
0a8cb8e3 1462 int nice;
5091faa4
MG		 1463 int err;
1464
1465 memset(buffer, 0, sizeof(buffer));
1466 if (count > sizeof(buffer) - 1)
1467 count = sizeof(buffer) - 1;
1468 if (copy_from_user(buffer, buf, count))
1469 return -EFAULT;
1470
0a8cb8e3
AD		 1471 err = kstrtoint(strstrip(buffer), 0, &nice);
1472 if (err < 0)
1473 return err;
5091faa4
MG		 1474
1475 p = get_proc_task(inode);
1476 if (!p)
1477 return -ESRCH;
1478
1479 err = nice;
1480 err = proc_sched_autogroup_set_nice(p, &err);
1481 if (err)
1482 count = err;
1483
1484 put_task_struct(p);
1485
1486 return count;
1487}
1488
1489static int sched_autogroup_open(struct inode *inode, struct file *filp)
1490{
1491 int ret;
1492
1493 ret = single_open(filp, sched_autogroup_show, NULL);
1494 if (!ret) {
1495 struct seq_file *m = filp->private_data;
1496
1497 m->private = inode;
1498 }
1499 return ret;
1500}
1501
1502static const struct file_operations proc_pid_sched_autogroup_operations = {
1503 .open = sched_autogroup_open,
1504 .read = seq_read,
1505 .write = sched_autogroup_write,
1506 .llseek = seq_lseek,
1507 .release = single_release,
1508};
1509
1510#endif /* CONFIG_SCHED_AUTOGROUP */
1511
4614a696 1512static ssize_t comm_write(struct file *file, const char __user *buf,
1513 size_t count, loff_t *offset)
1514{
1515 struct inode *inode = file->f_path.dentry->d_inode;
1516 struct task_struct *p;
1517 char buffer[TASK_COMM_LEN];
1518
1519 memset(buffer, 0, sizeof(buffer));
1520 if (count > sizeof(buffer) - 1)
1521 count = sizeof(buffer) - 1;
1522 if (copy_from_user(buffer, buf, count))
1523 return -EFAULT;
1524
1525 p = get_proc_task(inode);
1526 if (!p)
1527 return -ESRCH;
1528
1529 if (same_thread_group(current, p))
1530 set_task_comm(p, buffer);
1531 else
1532 count = -EINVAL;
1533
1534 put_task_struct(p);
1535
1536 return count;
1537}
1538
1539static int comm_show(struct seq_file *m, void *v)
1540{
1541 struct inode *inode = m->private;
1542 struct task_struct *p;
1543
1544 p = get_proc_task(inode);
1545 if (!p)
1546 return -ESRCH;
1547
1548 task_lock(p);
1549 seq_printf(m, "%s\n", p->comm);
1550 task_unlock(p);
1551
1552 put_task_struct(p);
1553
1554 return 0;
1555}
1556
1557static int comm_open(struct inode *inode, struct file *filp)
1558{
c6a34058 1559 return single_open(filp, comm_show, inode);
4614a696 1560}
1561
1562static const struct file_operations proc_pid_set_comm_operations = {
1563 .open = comm_open,
1564 .read = seq_read,
1565 .write = comm_write,
1566 .llseek = seq_lseek,
1567 .release = single_release,
1568};
1569
925d1c40
MH		 1570static int proc_exe_link(struct inode *inode, struct path *exe_path)
1571{
1572 struct task_struct *task;
1573 struct mm_struct *mm;
1574 struct file *exe_file;
1575
1576 task = get_proc_task(inode);
1577 if (!task)
1578 return -ENOENT;
1579 mm = get_task_mm(task);
1580 put_task_struct(task);
1581 if (!mm)
1582 return -ENOENT;
1583 exe_file = get_mm_exe_file(mm);
1584 mmput(mm);
1585 if (exe_file) {
1586 *exe_path = exe_file->f_path;
1587 path_get(&exe_file->f_path);
1588 fput(exe_file);
1589 return 0;
1590 } else
1591 return -ENOENT;
1592}
1593
008b150a 1594static void *proc_pid_follow_link(struct dentry *dentry, struct nameidata *nd)
1da177e4
LT		 1595{
1596 struct inode *inode = dentry->d_inode;
1597 int error = -EACCES;
1598
1599 /* We don't need a base pointer in the /proc filesystem */
1d957f9b 1600 path_put(&nd->path);
1da177e4 1601
778c1144
EB		 1602 /* Are we allowed to snoop on the tasks file descriptors? */
1603 if (!proc_fd_access_allowed(inode))
1da177e4 1604 goto out;
1da177e4 1605
3dcd25f3 1606 error = PROC_I(inode)->op.proc_get_link(inode, &nd->path);
1da177e4 1607out:
008b150a 1608 return ERR_PTR(error);
1da177e4
LT		 1609}
1610
3dcd25f3 1611static int do_proc_readlink(struct path *path, char __user *buffer, int buflen)
1da177e4 1612{
e12ba74d 1613 char *tmp = (char*)__get_free_page(GFP_TEMPORARY);
3dcd25f3 1614 char *pathname;
1da177e4
LT		 1615 int len;
1616
1617 if (!tmp)
1618 return -ENOMEM;
0c28f287 1619
7b2a69ba 1620 pathname = d_path(path, tmp, PAGE_SIZE);
3dcd25f3
JB		 1621 len = PTR_ERR(pathname);
1622 if (IS_ERR(pathname))
1da177e4 1623 goto out;
3dcd25f3 1624 len = tmp + PAGE_SIZE - 1 - pathname;
1da177e4
LT		 1625
1626 if (len > buflen)
1627 len = buflen;
3dcd25f3 1628 if (copy_to_user(buffer, pathname, len))
1da177e4
LT		 1629 len = -EFAULT;
1630 out:
1631 free_page((unsigned long)tmp);
1632 return len;
1633}
1634
1635static int proc_pid_readlink(struct dentry * dentry, char __user * buffer, int buflen)
1636{
1637 int error = -EACCES;
1638 struct inode *inode = dentry->d_inode;
3dcd25f3 1639 struct path path;
1da177e4 1640
778c1144
EB		 1641 /* Are we allowed to snoop on the tasks file descriptors? */
1642 if (!proc_fd_access_allowed(inode))
1da177e4 1643 goto out;
1da177e4 1644
3dcd25f3 1645 error = PROC_I(inode)->op.proc_get_link(inode, &path);
1da177e4
LT		 1646 if (error)
1647 goto out;
1648
3dcd25f3
JB		 1649 error = do_proc_readlink(&path, buffer, buflen);
1650 path_put(&path);
1da177e4 1651out:
1da177e4
LT		 1652 return error;
1653}
1654
aa6afca5
VK		 1655static int proc_pid_fd_link_getattr(struct vfsmount *mnt, struct dentry *dentry,
1656 struct kstat *stat)
1657{
1658 struct inode *inode = dentry->d_inode;
1659 struct task_struct *task = get_proc_task(inode);
1660 int rc;
1661
1662 if (task == NULL)
1663 return -ESRCH;
1664
1665 rc = -EACCES;
1666 if (lock_trace(task))
1667 goto out_task;
1668
1669 generic_fillattr(inode, stat);
1670 unlock_trace(task);
1671 rc = 0;
1672out_task:
1673 put_task_struct(task);
1674 return rc;
1675}
1676
c5ef1c42 1677static const struct inode_operations proc_pid_link_inode_operations = {
1da177e4 1678 .readlink = proc_pid_readlink,
6d76fa58
LT		 1679 .follow_link = proc_pid_follow_link,
1680 .setattr = proc_setattr,
1da177e4
LT		 1681};
1682
aa6afca5
VK		 1683static const struct inode_operations proc_fdinfo_link_inode_operations = {
1684 .setattr = proc_setattr,
1685 .getattr = proc_pid_fd_link_getattr,
1686};
1687
1688static const struct inode_operations proc_fd_link_inode_operations = {
1689 .readlink = proc_pid_readlink,
1690 .follow_link = proc_pid_follow_link,
1691 .setattr = proc_setattr,
1692 .getattr = proc_pid_fd_link_getattr,
1693};
1694
28a6d671
EB		 1695
1696/* building an inode */
1697
1698static int task_dumpable(struct task_struct *task)
1da177e4 1699{
28a6d671
EB		 1700 int dumpable = 0;
1701 struct mm_struct *mm;
1da177e4 1702
28a6d671
EB		 1703 task_lock(task);
1704 mm = task->mm;
1705 if (mm)
6c5d5238 1706 dumpable = get_dumpable(mm);
28a6d671
EB		 1707 task_unlock(task);
1708 if(dumpable == 1)
1709 return 1;
1710 return 0;
1711}
1da177e4 1712
6b4e306a 1713struct inode *proc_pid_make_inode(struct super_block * sb, struct task_struct *task)
28a6d671
EB		 1714{
1715 struct inode * inode;
1716 struct proc_inode *ei;
c69e8d9c 1717 const struct cred *cred;
1da177e4 1718
28a6d671 1719 /* We need a new inode */
1da177e4 1720
28a6d671
EB		 1721 inode = new_inode(sb);
1722 if (!inode)
1723 goto out;
1724
1725 /* Common stuff */
1726 ei = PROC_I(inode);
85fe4025 1727 inode->i_ino = get_next_ino();
28a6d671 1728 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
28a6d671
EB		 1729 inode->i_op = &proc_def_inode_operations;
1730
1731 /*
1732 * grab the reference to task.
1733 */
1a657f78 1734 ei->pid = get_task_pid(task, PIDTYPE_PID);
28a6d671
EB		 1735 if (!ei->pid)
1736 goto out_unlock;
1737
28a6d671 1738 if (task_dumpable(task)) {
c69e8d9c
DH		 1739 rcu_read_lock();
1740 cred = __task_cred(task);
1741 inode->i_uid = cred->euid;
1742 inode->i_gid = cred->egid;
1743 rcu_read_unlock();
1da177e4 1744 }
28a6d671
EB		 1745 security_task_to_inode(task, inode);
1746
1da177e4 1747out:
28a6d671
EB		 1748 return inode;
1749
1750out_unlock:
1751 iput(inode);
1752 return NULL;
1da177e4
LT		 1753}
1754
6b4e306a 1755int pid_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
1da177e4 1756{
1da177e4 1757 struct inode *inode = dentry->d_inode;
28a6d671 1758 struct task_struct *task;
c69e8d9c
DH		 1759 const struct cred *cred;
1760
28a6d671 1761 generic_fillattr(inode, stat);
1da177e4 1762
28a6d671
EB		 1763 rcu_read_lock();
1764 stat->uid = 0;
1765 stat->gid = 0;
1766 task = pid_task(proc_pid(inode), PIDTYPE_PID);
1767 if (task) {
1768 if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) ||
1769 task_dumpable(task)) {
c69e8d9c
DH		 1770 cred = __task_cred(task);
1771 stat->uid = cred->euid;
1772 stat->gid = cred->egid;
1da177e4
LT		 1773 }
1774 }
28a6d671 1775 rcu_read_unlock();
d6e71144 1776 return 0;
1da177e4
LT		 1777}
1778
1da177e4
LT		 1779/* dentry stuff */
1780
1781/*
1782 * Exceptional case: normally we are not allowed to unhash a busy
1783 * directory. In this case, however, we can do it - no aliasing problems
1784 * due to the way we treat inodes.
1785 *
1786 * Rewrite the inode's ownerships here because the owning task may have
1787 * performed a setuid(), etc.
99f89551
EB		 1788 *
1789 * Before the /proc/pid/status file was created the only way to read
1790 * the effective uid of a /process was to stat /proc/pid. Reading
1791 * /proc/pid/status is slow enough that procps and other packages
1792 * kept stating /proc/pid. To keep the rules in /proc simple I have
1793 * made this apply to all per process world readable and executable
1794 * directories.
1da177e4 1795 */
6b4e306a 1796int pid_revalidate(struct dentry *dentry, struct nameidata *nd)
1da177e4 1797{
34286d66
NP		 1798 struct inode *inode;
1799 struct task_struct *task;
c69e8d9c
DH		 1800 const struct cred *cred;
1801
34286d66
NP		 1802 if (nd && nd->flags & LOOKUP_RCU)
1803 return -ECHILD;
1804
1805 inode = dentry->d_inode;
1806 task = get_proc_task(inode);
1807
99f89551
EB		 1808 if (task) {
1809 if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) ||
1810 task_dumpable(task)) {
c69e8d9c
DH		 1811 rcu_read_lock();
1812 cred = __task_cred(task);
1813 inode->i_uid = cred->euid;
1814 inode->i_gid = cred->egid;
1815 rcu_read_unlock();
1da177e4
LT		 1816 } else {
1817 inode->i_uid = 0;
1818 inode->i_gid = 0;
1819 }
9ee8ab9f 1820 inode->i_mode &= ~(S_ISUID | S_ISGID);
1da177e4 1821 security_task_to_inode(task, inode);
99f89551 1822 put_task_struct(task);
1da177e4
LT		 1823 return 1;
1824 }
1825 d_drop(dentry);
1826 return 0;
1827}
1828
fe15ce44 1829static int pid_delete_dentry(const struct dentry * dentry)
99f89551 1830{
28a6d671
EB		 1831 /* Is the task we represent dead?
1832 * If so, then don't put the dentry on the lru list,
1833 * kill it immediately.
1834 */
1835 return !proc_pid(dentry->d_inode)->tasks[PIDTYPE_PID].first;
1836}
1837
6b4e306a 1838const struct dentry_operations pid_dentry_operations =
28a6d671
EB		 1839{
1840 .d_revalidate = pid_revalidate,
1841 .d_delete = pid_delete_dentry,
1842};
1843
1844/* Lookups */
1845
1c0d04c9
EB		 1846/*
1847 * Fill a directory entry.
1848 *
1849 * If possible create the dcache entry and derive our inode number and
1850 * file type from dcache entry.
1851 *
1852 * Since all of the proc inode numbers are dynamically generated, the inode
1853 * numbers do not exist until the inode is cache. This means creating the
1854 * the dcache entry in readdir is necessary to keep the inode numbers
1855 * reported by readdir in sync with the inode numbers reported
1856 * by stat.
1857 */
6b4e306a
EB		 1858int proc_fill_cache(struct file *filp, void *dirent, filldir_t filldir,
1859 const char *name, int len,
c5141e6d 1860 instantiate_t instantiate, struct task_struct *task, const void *ptr)
61a28784 1861{
2fddfeef 1862 struct dentry *child, *dir = filp->f_path.dentry;
61a28784
EB		 1863 struct inode *inode;
1864 struct qstr qname;
1865 ino_t ino = 0;
1866 unsigned type = DT_UNKNOWN;
1867
1868 qname.name = name;
1869 qname.len = len;
1870 qname.hash = full_name_hash(name, len);
1871
1872 child = d_lookup(dir, &qname);
1873 if (!child) {
1874 struct dentry *new;
1875 new = d_alloc(dir, &qname);
1876 if (new) {
1877 child = instantiate(dir->d_inode, new, task, ptr);
1878 if (child)
1879 dput(new);
1880 else
1881 child = new;
1882 }
1883 }
1884 if (!child || IS_ERR(child) || !child->d_inode)
1885 goto end_instantiate;
1886 inode = child->d_inode;
1887 if (inode) {
1888 ino = inode->i_ino;
1889 type = inode->i_mode >> 12;
1890 }
1891 dput(child);
1892end_instantiate:
1893 if (!ino)
1894 ino = find_inode_number(dir, &qname);
1895 if (!ino)
1896 ino = 1;
1897 return filldir(dirent, name, len, filp->f_pos, ino, type);
1898}
1899
28a6d671
EB		 1900static unsigned name_to_int(struct dentry *dentry)
1901{
1902 const char *name = dentry->d_name.name;
1903 int len = dentry->d_name.len;
1904 unsigned n = 0;
1905
1906 if (len > 1 && *name == '0')
1907 goto out;
1908 while (len-- > 0) {
1909 unsigned c = *name++ - '0';
1910 if (c > 9)
1911 goto out;
1912 if (n >= (~0U-9)/10)
1913 goto out;
1914 n *= 10;
1915 n += c;
1916 }
1917 return n;
1918out:
1919 return ~0U;
1920}
1921
27932742
MS		 1922#define PROC_FDINFO_MAX 64
1923
3dcd25f3 1924static int proc_fd_info(struct inode *inode, struct path *path, char *info)
28a6d671 1925{
aa6afca5
VK		 1926 struct task_struct *task;
1927 struct files_struct *files;
28a6d671
EB		 1928 struct file *file;
1929 int fd = proc_fd(inode);
aa6afca5 1930 int rc;
99f89551 1931
aa6afca5
VK		 1932 task = get_proc_task(inode);
1933 if (!task)
1934 return -ENOENT;
1935
1936 rc = -EACCES;
1937 if (lock_trace(task))
1938 goto out_task;
1939
1940 rc = -ENOENT;
1941 files = get_files_struct(task);
1942 if (files == NULL)
1943 goto out_unlock;
1944
1945 /*
1946 * We are not taking a ref to the file structure, so we must
1947 * hold ->file_lock.
1948 */
1949 spin_lock(&files->file_lock);
1950 file = fcheck_files(files, fd);
1951 if (file) {
1952 unsigned int f_flags;
1953 struct fdtable *fdt;
1954
1955 fdt = files_fdtable(files);
1956 f_flags = file->f_flags & ~O_CLOEXEC;
1957 if (FD_ISSET(fd, fdt->close_on_exec))
1958 f_flags |= O_CLOEXEC;
1959
1960 if (path) {
1961 *path = file->f_path;
1962 path_get(&file->f_path);
99f89551 1963 }
aa6afca5
VK		 1964 if (info)
1965 snprintf(info, PROC_FDINFO_MAX,
1966 "pos:\t%lli\n"
1967 "flags:\t0%o\n",
1968 (long long) file->f_pos,
1969 f_flags);
1970 rc = 0;
1971 } else
1972 rc = -ENOENT;
1973 spin_unlock(&files->file_lock);
1974 put_files_struct(files);
1975
1976out_unlock:
1977 unlock_trace(task);
1978out_task:
1979 put_task_struct(task);
1980 return rc;
99f89551
EB		 1981}
1982
3dcd25f3 1983static int proc_fd_link(struct inode *inode, struct path *path)
27932742 1984{
3dcd25f3 1985 return proc_fd_info(inode, path, NULL);
27932742
MS		 1986}
1987
1da177e4
LT		 1988static int tid_fd_revalidate(struct dentry *dentry, struct nameidata *nd)
1989{
34286d66
NP		 1990 struct inode *inode;
1991 struct task_struct *task;
1992 int fd;
1da177e4 1993 struct files_struct *files;
c69e8d9c 1994 const struct cred *cred;
1da177e4 1995
34286d66
NP		 1996 if (nd && nd->flags & LOOKUP_RCU)
1997 return -ECHILD;
1998
1999 inode = dentry->d_inode;
2000 task = get_proc_task(inode);
2001 fd = proc_fd(inode);
2002
99f89551
EB		 2003 if (task) {
2004 files = get_files_struct(task);
2005 if (files) {
2006 rcu_read_lock();
2007 if (fcheck_files(files, fd)) {
2008 rcu_read_unlock();
2009 put_files_struct(files);
2010 if (task_dumpable(task)) {
c69e8d9c
DH		 2011 rcu_read_lock();
2012 cred = __task_cred(task);
2013 inode->i_uid = cred->euid;
2014 inode->i_gid = cred->egid;
2015 rcu_read_unlock();
99f89551
EB		 2016 } else {
2017 inode->i_uid = 0;
2018 inode->i_gid = 0;
2019 }
9ee8ab9f 2020 inode->i_mode &= ~(S_ISUID | S_ISGID);
99f89551
EB		 2021 security_task_to_inode(task, inode);
2022 put_task_struct(task);
2023 return 1;
2024 }
b835996f 2025 rcu_read_unlock();
1da177e4 2026 put_files_struct(files);
1da177e4 2027 }
99f89551 2028 put_task_struct(task);
1da177e4
LT		 2029 }
2030 d_drop(dentry);
2031 return 0;
2032}
2033
d72f71eb 2034static const struct dentry_operations tid_fd_dentry_operations =
1da177e4
LT		 2035{
2036 .d_revalidate = tid_fd_revalidate,
2037 .d_delete = pid_delete_dentry,
2038};
2039
444ceed8 2040static struct dentry *proc_fd_instantiate(struct inode *dir,
c5141e6d 2041 struct dentry *dentry, struct task_struct *task, const void *ptr)
1da177e4 2042{
c5141e6d 2043 unsigned fd = *(const unsigned *)ptr;
444ceed8
EB		 2044 struct file *file;
2045 struct files_struct *files;
2046 struct inode *inode;
2047 struct proc_inode *ei;
2048 struct dentry *error = ERR_PTR(-ENOENT);
1da177e4 2049
61a28784 2050 inode = proc_pid_make_inode(dir->i_sb, task);
1da177e4
LT		 2051 if (!inode)
2052 goto out;
2053 ei = PROC_I(inode);
aed7a6c4 2054 ei->fd = fd;
1da177e4
LT		 2055 files = get_files_struct(task);
2056 if (!files)
444ceed8 2057 goto out_iput;
1da177e4 2058 inode->i_mode = S_IFLNK;
ca99c1da
DS		 2059
2060 /*
2061 * We are not taking a ref to the file structure, so we must
2062 * hold ->file_lock.
2063 */
2064 spin_lock(&files->file_lock);
1da177e4
LT		 2065 file = fcheck_files(files, fd);
2066 if (!file)
444ceed8 2067 goto out_unlock;
aeb5d727 2068 if (file->f_mode & FMODE_READ)
1da177e4 2069 inode->i_mode |= S_IRUSR | S_IXUSR;
aeb5d727 2070 if (file->f_mode & FMODE_WRITE)
1da177e4 2071 inode->i_mode |= S_IWUSR | S_IXUSR;
ca99c1da 2072 spin_unlock(&files->file_lock);
1da177e4 2073 put_files_struct(files);
444ceed8 2074
aa6afca5 2075 inode->i_op = &proc_fd_link_inode_operations;
1da177e4
LT		 2076 inode->i_size = 64;
2077 ei->op.proc_get_link = proc_fd_link;
fb045adb 2078 d_set_d_op(dentry, &tid_fd_dentry_operations);
1da177e4 2079 d_add(dentry, inode);
cd6a3ce9
EB		 2080 /* Close the race of the process dying before we return the dentry */
2081 if (tid_fd_revalidate(dentry, NULL))
444ceed8 2082 error = NULL;
1da177e4 2083
444ceed8
EB		 2084 out:
2085 return error;
2086out_unlock:
ca99c1da 2087 spin_unlock(&files->file_lock);
1da177e4 2088 put_files_struct(files);
444ceed8 2089out_iput:
1da177e4 2090 iput(inode);
cd6a3ce9 2091 goto out;
1da177e4
LT		 2092}
2093
27932742
MS		 2094static struct dentry *proc_lookupfd_common(struct inode *dir,
2095 struct dentry *dentry,
2096 instantiate_t instantiate)
444ceed8
EB		 2097{
2098 struct task_struct *task = get_proc_task(dir);
2099 unsigned fd = name_to_int(dentry);
2100 struct dentry *result = ERR_PTR(-ENOENT);
2101
2102 if (!task)
2103 goto out_no_task;
2104 if (fd == ~0U)
2105 goto out;
2106
aa6afca5
VK		 2107 result = ERR_PTR(-EACCES);
2108 if (lock_trace(task))
2109 goto out;
2110
27932742 2111 result = instantiate(dir, dentry, task, &fd);
aa6afca5 2112 unlock_trace(task);
444ceed8
EB		 2113out:
2114 put_task_struct(task);
2115out_no_task:
2116 return result;
2117}
2118
27932742
MS		 2119static int proc_readfd_common(struct file * filp, void * dirent,
2120 filldir_t filldir, instantiate_t instantiate)
28a6d671 2121{
2fddfeef 2122 struct dentry *dentry = filp->f_path.dentry;
28a6d671
EB		 2123 struct inode *inode = dentry->d_inode;
2124 struct task_struct *p = get_proc_task(inode);
457c2510 2125 unsigned int fd, ino;
28a6d671 2126 int retval;
28a6d671 2127 struct files_struct * files;
1da177e4 2128
28a6d671
EB		 2129 retval = -ENOENT;
2130 if (!p)
2131 goto out_no_task;
aa6afca5
VK		 2132
2133 retval = -EACCES;
2134 if (lock_trace(p))
2135 goto out;
2136
28a6d671 2137 retval = 0;
28a6d671
EB		 2138
2139 fd = filp->f_pos;
2140 switch (fd) {
2141 case 0:
2142 if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0)
aa6afca5 2143 goto out_unlock;
28a6d671
EB		 2144 filp->f_pos++;
2145 case 1:
2146 ino = parent_ino(dentry);
2147 if (filldir(dirent, "..", 2, 1, ino, DT_DIR) < 0)
aa6afca5 2148 goto out_unlock;
28a6d671
EB		 2149 filp->f_pos++;
2150 default:
2151 files = get_files_struct(p);
2152 if (!files)
aa6afca5 2153 goto out_unlock;
28a6d671 2154 rcu_read_lock();
28a6d671 2155 for (fd = filp->f_pos-2;
9b4f526c 2156 fd < files_fdtable(files)->max_fds;
28a6d671 2157 fd++, filp->f_pos++) {
27932742
MS		 2158 char name[PROC_NUMBUF];
2159 int len;
28a6d671
EB		 2160
2161 if (!fcheck_files(files, fd))
2162 continue;
2163 rcu_read_unlock();
2164
27932742
MS		 2165 len = snprintf(name, sizeof(name), "%d", fd);
2166 if (proc_fill_cache(filp, dirent, filldir,
2167 name, len, instantiate,
2168 p, &fd) < 0) {
28a6d671
EB		 2169 rcu_read_lock();
2170 break;
2171 }
2172 rcu_read_lock();
2173 }
2174 rcu_read_unlock();
2175 put_files_struct(files);
2176 }
aa6afca5
VK		 2177
2178out_unlock:
2179 unlock_trace(p);
28a6d671
EB		 2180out:
2181 put_task_struct(p);
2182out_no_task:
2183 return retval;
2184}
2185
27932742
MS		 2186static struct dentry *proc_lookupfd(struct inode *dir, struct dentry *dentry,
2187 struct nameidata *nd)
2188{
2189 return proc_lookupfd_common(dir, dentry, proc_fd_instantiate);
2190}
2191
2192static int proc_readfd(struct file *filp, void *dirent, filldir_t filldir)
2193{
2194 return proc_readfd_common(filp, dirent, filldir, proc_fd_instantiate);
2195}
2196
2197static ssize_t proc_fdinfo_read(struct file *file, char __user *buf,
2198 size_t len, loff_t *ppos)
2199{
2200 char tmp[PROC_FDINFO_MAX];
3dcd25f3 2201 int err = proc_fd_info(file->f_path.dentry->d_inode, NULL, tmp);
27932742
MS		 2202 if (!err)
2203 err = simple_read_from_buffer(buf, len, ppos, tmp, strlen(tmp));
2204 return err;
2205}
2206
2207static const struct file_operations proc_fdinfo_file_operations = {
87df8424 2208 .open = nonseekable_open,
27932742 2209 .read = proc_fdinfo_read,
6038f373 2210 .llseek = no_llseek,
27932742
MS		 2211};
2212
00977a59 2213static const struct file_operations proc_fd_operations = {
28a6d671
EB		 2214 .read = generic_read_dir,
2215 .readdir = proc_readfd,
6038f373 2216 .llseek = default_llseek,
1da177e4
LT		 2217};
2218
8948e11f
AD		 2219/*
2220 * /proc/pid/fd needs a special permission handler so that a process can still
2221 * access /proc/self/fd after it has executed a setuid().
2222 */
10556cb2 2223static int proc_fd_permission(struct inode *inode, int mask)
8948e11f 2224{
2830ba7f 2225 int rv = generic_permission(inode, mask);
8948e11f
AD		 2226 if (rv == 0)
2227 return 0;
2228 if (task_pid(current) == proc_pid(inode))
2229 rv = 0;
2230 return rv;
2231}
2232
1da177e4
LT		 2233/*
2234 * proc directories can do almost nothing..
2235 */
c5ef1c42 2236static const struct inode_operations proc_fd_inode_operations = {
1da177e4 2237 .lookup = proc_lookupfd,
8948e11f 2238 .permission = proc_fd_permission,
6d76fa58 2239 .setattr = proc_setattr,
1da177e4
LT		 2240};
2241
27932742
MS		 2242static struct dentry *proc_fdinfo_instantiate(struct inode *dir,
2243 struct dentry *dentry, struct task_struct *task, const void *ptr)
2244{
2245 unsigned fd = *(unsigned *)ptr;
2246 struct inode *inode;
2247 struct proc_inode *ei;
2248 struct dentry *error = ERR_PTR(-ENOENT);
2249
2250 inode = proc_pid_make_inode(dir->i_sb, task);
2251 if (!inode)
2252 goto out;
2253 ei = PROC_I(inode);
2254 ei->fd = fd;
2255 inode->i_mode = S_IFREG | S_IRUSR;
2256 inode->i_fop = &proc_fdinfo_file_operations;
aa6afca5 2257 inode->i_op = &proc_fdinfo_link_inode_operations;
fb045adb 2258 d_set_d_op(dentry, &tid_fd_dentry_operations);
27932742
MS		 2259 d_add(dentry, inode);
2260 /* Close the race of the process dying before we return the dentry */
2261 if (tid_fd_revalidate(dentry, NULL))
2262 error = NULL;
2263
2264 out:
2265 return error;
2266}
2267
2268static struct dentry *proc_lookupfdinfo(struct inode *dir,
2269 struct dentry *dentry,
2270 struct nameidata *nd)
2271{
2272 return proc_lookupfd_common(dir, dentry, proc_fdinfo_instantiate);
2273}
2274
2275static int proc_readfdinfo(struct file *filp, void *dirent, filldir_t filldir)
2276{
2277 return proc_readfd_common(filp, dirent, filldir,
2278 proc_fdinfo_instantiate);
2279}
2280
2281static const struct file_operations proc_fdinfo_operations = {
2282 .read = generic_read_dir,
2283 .readdir = proc_readfdinfo,
6038f373 2284 .llseek = default_llseek,
27932742
MS		 2285};
2286
2287/*
2288 * proc directories can do almost nothing..
2289 */
2290static const struct inode_operations proc_fdinfo_inode_operations = {
2291 .lookup = proc_lookupfdinfo,
2292 .setattr = proc_setattr,
2293};
2294
2295
444ceed8 2296static struct dentry *proc_pident_instantiate(struct inode *dir,
c5141e6d 2297 struct dentry *dentry, struct task_struct *task, const void *ptr)
444ceed8 2298{
c5141e6d 2299 const struct pid_entry *p = ptr;
444ceed8
EB		 2300 struct inode *inode;
2301 struct proc_inode *ei;
bd6daba9 2302 struct dentry *error = ERR_PTR(-ENOENT);
444ceed8 2303
61a28784 2304 inode = proc_pid_make_inode(dir->i_sb, task);
444ceed8
EB		 2305 if (!inode)
2306 goto out;
2307
2308 ei = PROC_I(inode);
2309 inode->i_mode = p->mode;
2310 if (S_ISDIR(inode->i_mode))
bfe86848 2311 set_nlink(inode, 2); /* Use getattr to fix if necessary */
444ceed8
EB		 2312 if (p->iop)
2313 inode->i_op = p->iop;
2314 if (p->fop)
2315 inode->i_fop = p->fop;
2316 ei->op = p->op;
fb045adb 2317 d_set_d_op(dentry, &pid_dentry_operations);
444ceed8
EB		 2318 d_add(dentry, inode);
2319 /* Close the race of the process dying before we return the dentry */
2320 if (pid_revalidate(dentry, NULL))
2321 error = NULL;
2322out:
2323 return error;
2324}
2325
1da177e4
LT		 2326static struct dentry *proc_pident_lookup(struct inode *dir,
2327 struct dentry *dentry,
c5141e6d 2328 const struct pid_entry *ents,
7bcd6b0e 2329 unsigned int nents)
1da177e4 2330{
cd6a3ce9 2331 struct dentry *error;
99f89551 2332 struct task_struct *task = get_proc_task(dir);
c5141e6d 2333 const struct pid_entry *p, *last;
1da177e4 2334
cd6a3ce9 2335 error = ERR_PTR(-ENOENT);
1da177e4 2336
99f89551
EB		 2337 if (!task)
2338 goto out_no_task;
1da177e4 2339
20cdc894
EB		 2340 /*
2341 * Yes, it does not scale. And it should not. Don't add
2342 * new entries into /proc/<tgid>/ without very good reasons.
2343 */
7bcd6b0e
EB		 2344 last = &ents[nents - 1];
2345 for (p = ents; p <= last; p++) {
1da177e4
LT		 2346 if (p->len != dentry->d_name.len)
2347 continue;
2348 if (!memcmp(dentry->d_name.name, p->name, p->len))
2349 break;
2350 }
7bcd6b0e 2351 if (p > last)
1da177e4
LT		 2352 goto out;
2353
444ceed8 2354 error = proc_pident_instantiate(dir, dentry, task, p);
1da177e4 2355out:
99f89551
EB		 2356 put_task_struct(task);
2357out_no_task:
cd6a3ce9 2358 return error;
1da177e4
LT		 2359}
2360
c5141e6d
ED		 2361static int proc_pident_fill_cache(struct file *filp, void *dirent,
2362 filldir_t filldir, struct task_struct *task, const struct pid_entry *p)
61a28784
EB		 2363{
2364 return proc_fill_cache(filp, dirent, filldir, p->name, p->len,
2365 proc_pident_instantiate, task, p);
2366}
2367
28a6d671
EB		 2368static int proc_pident_readdir(struct file *filp,
2369 void *dirent, filldir_t filldir,
c5141e6d 2370 const struct pid_entry *ents, unsigned int nents)
28a6d671
EB		 2371{
2372 int i;
2fddfeef 2373 struct dentry *dentry = filp->f_path.dentry;
28a6d671
EB		 2374 struct inode *inode = dentry->d_inode;
2375 struct task_struct *task = get_proc_task(inode);
c5141e6d 2376 const struct pid_entry *p, *last;
28a6d671
EB		 2377 ino_t ino;
2378 int ret;
2379
2380 ret = -ENOENT;
2381 if (!task)
61a28784 2382 goto out_no_task;
28a6d671
EB		 2383
2384 ret = 0;
28a6d671
EB		 2385 i = filp->f_pos;
2386 switch (i) {
2387 case 0:
2388 ino = inode->i_ino;
2389 if (filldir(dirent, ".", 1, i, ino, DT_DIR) < 0)
2390 goto out;
2391 i++;
2392 filp->f_pos++;
2393 /* fall through */
2394 case 1:
2395 ino = parent_ino(dentry);
2396 if (filldir(dirent, "..", 2, i, ino, DT_DIR) < 0)
2397 goto out;
2398 i++;
2399 filp->f_pos++;
2400 /* fall through */
2401 default:
2402 i -= 2;
2403 if (i >= nents) {
2404 ret = 1;
2405 goto out;
2406 }
2407 p = ents + i;
7bcd6b0e
EB		 2408 last = &ents[nents - 1];
2409 while (p <= last) {
61a28784 2410 if (proc_pident_fill_cache(filp, dirent, filldir, task, p) < 0)
28a6d671
EB		 2411 goto out;
2412 filp->f_pos++;
2413 p++;
2414 }
2415 }
2416
2417 ret = 1;
2418out:
61a28784
EB		 2419 put_task_struct(task);
2420out_no_task:
28a6d671 2421 return ret;
1da177e4
LT		 2422}
2423
28a6d671
EB		 2424#ifdef CONFIG_SECURITY
2425static ssize_t proc_pid_attr_read(struct file * file, char __user * buf,
2426 size_t count, loff_t *ppos)
2427{
2fddfeef 2428 struct inode * inode = file->f_path.dentry->d_inode;
04ff9708 2429 char *p = NULL;
28a6d671
EB		 2430 ssize_t length;
2431 struct task_struct *task = get_proc_task(inode);
2432
28a6d671 2433 if (!task)
04ff9708 2434 return -ESRCH;
28a6d671
EB		 2435
2436 length = security_getprocattr(task,
2fddfeef 2437 (char*)file->f_path.dentry->d_name.name,
04ff9708 2438 &p);
28a6d671 2439 put_task_struct(task);
04ff9708
AV		 2440 if (length > 0)
2441 length = simple_read_from_buffer(buf, count, ppos, p, length);
2442 kfree(p);
28a6d671 2443 return length;
1da177e4
LT		 2444}
2445
28a6d671
EB		 2446static ssize_t proc_pid_attr_write(struct file * file, const char __user * buf,
2447 size_t count, loff_t *ppos)
2448{
2fddfeef 2449 struct inode * inode = file->f_path.dentry->d_inode;
28a6d671
EB		 2450 char *page;
2451 ssize_t length;
2452 struct task_struct *task = get_proc_task(inode);
2453
2454 length = -ESRCH;
2455 if (!task)
2456 goto out_no_task;
2457 if (count > PAGE_SIZE)
2458 count = PAGE_SIZE;
2459
2460 /* No partial writes. */
2461 length = -EINVAL;
2462 if (*ppos != 0)
2463 goto out;
2464
2465 length = -ENOMEM;
e12ba74d 2466 page = (char*)__get_free_page(GFP_TEMPORARY);
28a6d671
EB		 2467 if (!page)
2468 goto out;
2469
2470 length = -EFAULT;
2471 if (copy_from_user(page, buf, count))
2472 goto out_free;
2473
107db7c7 2474 /* Guard against adverse ptrace interaction */
9b1bf12d 2475 length = mutex_lock_interruptible(&task->signal->cred_guard_mutex);
107db7c7
DH		 2476 if (length < 0)
2477 goto out_free;
2478
28a6d671 2479 length = security_setprocattr(task,
2fddfeef 2480 (char*)file->f_path.dentry->d_name.name,
28a6d671 2481 (void*)page, count);
9b1bf12d 2482 mutex_unlock(&task->signal->cred_guard_mutex);
28a6d671
EB		 2483out_free:
2484 free_page((unsigned long) page);
2485out:
2486 put_task_struct(task);
2487out_no_task:
2488 return length;
2489}
2490
00977a59 2491static const struct file_operations proc_pid_attr_operations = {
28a6d671
EB		 2492 .read = proc_pid_attr_read,
2493 .write = proc_pid_attr_write,
87df8424 2494 .llseek = generic_file_llseek,
28a6d671
EB		 2495};
2496
c5141e6d 2497static const struct pid_entry attr_dir_stuff[] = {
631f9c18
AD		 2498 REG("current", S_IRUGO|S_IWUGO, proc_pid_attr_operations),
2499 REG("prev", S_IRUGO, proc_pid_attr_operations),
2500 REG("exec", S_IRUGO|S_IWUGO, proc_pid_attr_operations),
2501 REG("fscreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations),
2502 REG("keycreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations),
2503 REG("sockcreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations),
28a6d671
EB		 2504};
2505
72d9dcfc 2506static int proc_attr_dir_readdir(struct file * filp,
28a6d671
EB		 2507 void * dirent, filldir_t filldir)
2508{
2509 return proc_pident_readdir(filp,dirent,filldir,
72d9dcfc 2510 attr_dir_stuff,ARRAY_SIZE(attr_dir_stuff));
28a6d671
EB		 2511}
2512
00977a59 2513static const struct file_operations proc_attr_dir_operations = {
1da177e4 2514 .read = generic_read_dir,
72d9dcfc 2515 .readdir = proc_attr_dir_readdir,
6038f373 2516 .llseek = default_llseek,
1da177e4
LT		 2517};
2518
72d9dcfc 2519static struct dentry *proc_attr_dir_lookup(struct inode *dir,
28a6d671
EB		 2520 struct dentry *dentry, struct nameidata *nd)
2521{
7bcd6b0e
EB		 2522 return proc_pident_lookup(dir, dentry,
2523 attr_dir_stuff, ARRAY_SIZE(attr_dir_stuff));
28a6d671
EB		 2524}
2525
c5ef1c42 2526static const struct inode_operations proc_attr_dir_inode_operations = {
72d9dcfc 2527 .lookup = proc_attr_dir_lookup,
99f89551 2528 .getattr = pid_getattr,
6d76fa58 2529 .setattr = proc_setattr,
1da177e4
LT		 2530};
2531
28a6d671
EB		 2532#endif
2533
698ba7b5 2534#ifdef CONFIG_ELF_CORE
3cb4a0bb
KH		 2535static ssize_t proc_coredump_filter_read(struct file *file, char __user *buf,
2536 size_t count, loff_t *ppos)
2537{
2538 struct task_struct *task = get_proc_task(file->f_dentry->d_inode);
2539 struct mm_struct *mm;
2540 char buffer[PROC_NUMBUF];
2541 size_t len;
2542 int ret;
2543
2544 if (!task)
2545 return -ESRCH;
2546
2547 ret = 0;
2548 mm = get_task_mm(task);
2549 if (mm) {
2550 len = snprintf(buffer, sizeof(buffer), "%08lx\n",
2551 ((mm->flags & MMF_DUMP_FILTER_MASK) >>
2552 MMF_DUMP_FILTER_SHIFT));
2553 mmput(mm);
2554 ret = simple_read_from_buffer(buf, count, ppos, buffer, len);
2555 }
2556
2557 put_task_struct(task);
2558
2559 return ret;
2560}
2561
2562static ssize_t proc_coredump_filter_write(struct file *file,
2563 const char __user *buf,
2564 size_t count,
2565 loff_t *ppos)
2566{
2567 struct task_struct *task;
2568 struct mm_struct *mm;
2569 char buffer[PROC_NUMBUF], *end;
2570 unsigned int val;
2571 int ret;
2572 int i;
2573 unsigned long mask;
2574
2575 ret = -EFAULT;
2576 memset(buffer, 0, sizeof(buffer));
2577 if (count > sizeof(buffer) - 1)
2578 count = sizeof(buffer) - 1;
2579 if (copy_from_user(buffer, buf, count))
2580 goto out_no_task;
2581
2582 ret = -EINVAL;
2583 val = (unsigned int)simple_strtoul(buffer, &end, 0);
2584 if (*end == '\n')
2585 end++;
2586 if (end - buffer == 0)
2587 goto out_no_task;
2588
2589 ret = -ESRCH;
2590 task = get_proc_task(file->f_dentry->d_inode);
2591 if (!task)
2592 goto out_no_task;
2593
2594 ret = end - buffer;
2595 mm = get_task_mm(task);
2596 if (!mm)
2597 goto out_no_mm;
2598
2599 for (i = 0, mask = 1; i < MMF_DUMP_FILTER_BITS; i++, mask <<= 1) {
2600 if (val & mask)
2601 set_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags);
2602 else
2603 clear_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags);
2604 }
2605
2606 mmput(mm);
2607 out_no_mm:
2608 put_task_struct(task);
2609 out_no_task:
2610 return ret;
2611}
2612
2613static const struct file_operations proc_coredump_filter_operations = {
2614 .read = proc_coredump_filter_read,
2615 .write = proc_coredump_filter_write,
87df8424 2616 .llseek = generic_file_llseek,
3cb4a0bb
KH		 2617};
2618#endif
2619
28a6d671
EB		 2620/*
2621 * /proc/self:
2622 */
2623static int proc_self_readlink(struct dentry *dentry, char __user *buffer,
2624 int buflen)
2625{
488e5bc4 2626 struct pid_namespace *ns = dentry->d_sb->s_fs_info;
b55fcb22 2627 pid_t tgid = task_tgid_nr_ns(current, ns);
28a6d671 2628 char tmp[PROC_NUMBUF];
b55fcb22 2629 if (!tgid)
488e5bc4 2630 return -ENOENT;
b55fcb22 2631 sprintf(tmp, "%d", tgid);
28a6d671
EB		 2632 return vfs_readlink(dentry,buffer,buflen,tmp);
2633}
2634
2635static void *proc_self_follow_link(struct dentry *dentry, struct nameidata *nd)
2636{
488e5bc4 2637 struct pid_namespace *ns = dentry->d_sb->s_fs_info;
b55fcb22 2638 pid_t tgid = task_tgid_nr_ns(current, ns);
7fee4868
AV		 2639 char *name = ERR_PTR(-ENOENT);
2640 if (tgid) {
2641 name = __getname();
2642 if (!name)
2643 name = ERR_PTR(-ENOMEM);
2644 else
2645 sprintf(name, "%d", tgid);
2646 }
2647 nd_set_link(nd, name);
2648 return NULL;
2649}
2650
2651static void proc_self_put_link(struct dentry *dentry, struct nameidata *nd,
2652 void *cookie)
2653{
2654 char *s = nd_get_link(nd);
2655 if (!IS_ERR(s))
2656 __putname(s);
28a6d671
EB		 2657}
2658
c5ef1c42 2659static const struct inode_operations proc_self_inode_operations = {
28a6d671
EB		 2660 .readlink = proc_self_readlink,
2661 .follow_link = proc_self_follow_link,
7fee4868 2662 .put_link = proc_self_put_link,
28a6d671
EB		 2663};
2664
801199ce
EB		 2665/*
2666 * proc base
2667 *
2668 * These are the directory entries in the root directory of /proc
2669 * that properly belong to the /proc filesystem, as they describe
2670 * describe something that is process related.
2671 */
c5141e6d 2672static const struct pid_entry proc_base_stuff[] = {
61a28784 2673 NOD("self", S_IFLNK|S_IRWXUGO,
801199ce 2674 &proc_self_inode_operations, NULL, {}),
801199ce
EB		 2675};
2676
444ceed8 2677static struct dentry *proc_base_instantiate(struct inode *dir,
c5141e6d 2678 struct dentry *dentry, struct task_struct *task, const void *ptr)
801199ce 2679{
c5141e6d 2680 const struct pid_entry *p = ptr;
801199ce 2681 struct inode *inode;
801199ce 2682 struct proc_inode *ei;
73d36460 2683 struct dentry *error;
801199ce
EB		 2684
2685 /* Allocate the inode */
2686 error = ERR_PTR(-ENOMEM);
2687 inode = new_inode(dir->i_sb);
2688 if (!inode)
2689 goto out;
2690
2691 /* Initialize the inode */
2692 ei = PROC_I(inode);
85fe4025 2693 inode->i_ino = get_next_ino();
801199ce 2694 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
801199ce
EB		 2695
2696 /*
2697 * grab the reference to the task.
2698 */
1a657f78 2699 ei->pid = get_task_pid(task, PIDTYPE_PID);
801199ce
EB		 2700 if (!ei->pid)
2701 goto out_iput;
2702
801199ce
EB		 2703 inode->i_mode = p->mode;
2704 if (S_ISDIR(inode->i_mode))
bfe86848 2705 set_nlink(inode, 2);
801199ce
EB		 2706 if (S_ISLNK(inode->i_mode))
2707 inode->i_size = 64;
2708 if (p->iop)
2709 inode->i_op = p->iop;
2710 if (p->fop)
2711 inode->i_fop = p->fop;
2712 ei->op = p->op;
801199ce
EB		 2713 d_add(dentry, inode);
2714 error = NULL;
2715out:
801199ce
EB		 2716 return error;
2717out_iput:
2718 iput(inode);
2719 goto out;
2720}
2721
444ceed8
EB		 2722static struct dentry *proc_base_lookup(struct inode *dir, struct dentry *dentry)
2723{
2724 struct dentry *error;
2725 struct task_struct *task = get_proc_task(dir);
c5141e6d 2726 const struct pid_entry *p, *last;
444ceed8
EB		 2727
2728 error = ERR_PTR(-ENOENT);
2729
2730 if (!task)
2731 goto out_no_task;
2732
2733 /* Lookup the directory entry */
7bcd6b0e
EB		 2734 last = &proc_base_stuff[ARRAY_SIZE(proc_base_stuff) - 1];
2735 for (p = proc_base_stuff; p <= last; p++) {
444ceed8
EB		 2736 if (p->len != dentry->d_name.len)
2737 continue;
2738 if (!memcmp(dentry->d_name.name, p->name, p->len))
2739 break;
2740 }
7bcd6b0e 2741 if (p > last)
444ceed8
EB		 2742 goto out;
2743
2744 error = proc_base_instantiate(dir, dentry, task, p);
2745
2746out:
2747 put_task_struct(task);
2748out_no_task:
2749 return error;
2750}
2751
c5141e6d
ED		 2752static int proc_base_fill_cache(struct file *filp, void *dirent,
2753 filldir_t filldir, struct task_struct *task, const struct pid_entry *p)
61a28784
EB		 2754{
2755 return proc_fill_cache(filp, dirent, filldir, p->name, p->len,
2756 proc_base_instantiate, task, p);
2757}
2758
aba76fdb 2759#ifdef CONFIG_TASK_IO_ACCOUNTING
297c5d92
AR		 2760static int do_io_accounting(struct task_struct *task, char *buffer, int whole)
2761{
940389b8 2762 struct task_io_accounting acct = task->ioac;
5995477a 2763 unsigned long flags;
293eb1e7 2764 int result;
5995477a 2765
293eb1e7
VK		 2766 result = mutex_lock_killable(&task->signal->cred_guard_mutex);
2767 if (result)
2768 return result;
2769
2770 if (!ptrace_may_access(task, PTRACE_MODE_READ)) {
2771 result = -EACCES;
2772 goto out_unlock;
2773 }
1d1221f3 2774
5995477a
AR		 2775 if (whole && lock_task_sighand(task, &flags)) {
2776 struct task_struct *t = task;
2777
2778 task_io_accounting_add(&acct, &task->signal->ioac);
2779 while_each_thread(task, t)
2780 task_io_accounting_add(&acct, &t->ioac);
2781
2782 unlock_task_sighand(task, &flags);
297c5d92 2783 }
293eb1e7 2784 result = sprintf(buffer,
aba76fdb
AM		 2785 "rchar: %llu\n"
2786 "wchar: %llu\n"
2787 "syscr: %llu\n"
2788 "syscw: %llu\n"
2789 "read_bytes: %llu\n"
2790 "write_bytes: %llu\n"
2791 "cancelled_write_bytes: %llu\n",
7c44319d
AB		 2792 (unsigned long long)acct.rchar,
2793 (unsigned long long)acct.wchar,
2794 (unsigned long long)acct.syscr,
2795 (unsigned long long)acct.syscw,
2796 (unsigned long long)acct.read_bytes,
2797 (unsigned long long)acct.write_bytes,
2798 (unsigned long long)acct.cancelled_write_bytes);
293eb1e7
VK		 2799out_unlock:
2800 mutex_unlock(&task->signal->cred_guard_mutex);
2801 return result;
297c5d92
AR		 2802}
2803
2804static int proc_tid_io_accounting(struct task_struct *task, char *buffer)
2805{
2806 return do_io_accounting(task, buffer, 0);
aba76fdb 2807}
297c5d92
AR		 2808
2809static int proc_tgid_io_accounting(struct task_struct *task, char *buffer)
2810{
2811 return do_io_accounting(task, buffer, 1);
2812}
2813#endif /* CONFIG_TASK_IO_ACCOUNTING */
aba76fdb 2814
47830723
KC		 2815static int proc_pid_personality(struct seq_file *m, struct pid_namespace *ns,
2816 struct pid *pid, struct task_struct *task)
2817{
a9712bc1
AV		 2818 int err = lock_trace(task);
2819 if (!err) {
2820 seq_printf(m, "%08x\n", task->personality);
2821 unlock_trace(task);
2822 }
2823 return err;
47830723
KC		 2824}
2825
28a6d671
EB		 2826/*
2827 * Thread groups
2828 */
00977a59 2829static const struct file_operations proc_task_operations;
c5ef1c42 2830static const struct inode_operations proc_task_inode_operations;
20cdc894 2831
c5141e6d 2832static const struct pid_entry tgid_base_stuff[] = {
631f9c18
AD		 2833 DIR("task", S_IRUGO|S_IXUGO, proc_task_inode_operations, proc_task_operations),
2834 DIR("fd", S_IRUSR|S_IXUSR, proc_fd_inode_operations, proc_fd_operations),
2835 DIR("fdinfo", S_IRUSR|S_IXUSR, proc_fdinfo_inode_operations, proc_fdinfo_operations),
6b4e306a 2836 DIR("ns", S_IRUSR|S_IXUGO, proc_ns_dir_inode_operations, proc_ns_dir_operations),
b2211a36 2837#ifdef CONFIG_NET
631f9c18 2838 DIR("net", S_IRUGO|S_IXUGO, proc_net_inode_operations, proc_net_operations),
b2211a36 2839#endif
631f9c18
AD		 2840 REG("environ", S_IRUSR, proc_environ_operations),
2841 INF("auxv", S_IRUSR, proc_pid_auxv),
2842 ONE("status", S_IRUGO, proc_pid_status),
a9712bc1 2843 ONE("personality", S_IRUGO, proc_pid_personality),
3036e7b4 2844 INF("limits", S_IRUGO, proc_pid_limits),
43ae34cb 2845#ifdef CONFIG_SCHED_DEBUG
631f9c18 2846 REG("sched", S_IRUGO|S_IWUSR, proc_pid_sched_operations),
5091faa4
MG		 2847#endif
2848#ifdef CONFIG_SCHED_AUTOGROUP
2849 REG("autogroup", S_IRUGO|S_IWUSR, proc_pid_sched_autogroup_operations),
ebcb6734 2850#endif
4614a696 2851 REG("comm", S_IRUGO|S_IWUSR, proc_pid_set_comm_operations),
ebcb6734 2852#ifdef CONFIG_HAVE_ARCH_TRACEHOOK
a9712bc1 2853 INF("syscall", S_IRUGO, proc_pid_syscall),
43ae34cb 2854#endif
631f9c18
AD		 2855 INF("cmdline", S_IRUGO, proc_pid_cmdline),
2856 ONE("stat", S_IRUGO, proc_tgid_stat),
2857 ONE("statm", S_IRUGO, proc_pid_statm),
2858 REG("maps", S_IRUGO, proc_maps_operations),
28a6d671 2859#ifdef CONFIG_NUMA
631f9c18 2860 REG("numa_maps", S_IRUGO, proc_numa_maps_operations),
28a6d671 2861#endif
631f9c18
AD		 2862 REG("mem", S_IRUSR|S_IWUSR, proc_mem_operations),
2863 LNK("cwd", proc_cwd_link),
2864 LNK("root", proc_root_link),
2865 LNK("exe", proc_exe_link),
2866 REG("mounts", S_IRUGO, proc_mounts_operations),
2867 REG("mountinfo", S_IRUGO, proc_mountinfo_operations),
2868 REG("mountstats", S_IRUSR, proc_mountstats_operations),
1e883281 2869#ifdef CONFIG_PROC_PAGE_MONITOR
631f9c18
AD		 2870 REG("clear_refs", S_IWUSR, proc_clear_refs_operations),
2871 REG("smaps", S_IRUGO, proc_smaps_operations),
ca6b0bf0 2872 REG("pagemap", S_IRUGO, proc_pagemap_operations),
28a6d671
EB		 2873#endif
2874#ifdef CONFIG_SECURITY
631f9c18 2875 DIR("attr", S_IRUGO|S_IXUGO, proc_attr_dir_inode_operations, proc_attr_dir_operations),
28a6d671
EB		 2876#endif
2877#ifdef CONFIG_KALLSYMS
631f9c18 2878 INF("wchan", S_IRUGO, proc_pid_wchan),
28a6d671 2879#endif
2ec220e2 2880#ifdef CONFIG_STACKTRACE
a9712bc1 2881 ONE("stack", S_IRUGO, proc_pid_stack),
28a6d671
EB		 2882#endif
2883#ifdef CONFIG_SCHEDSTATS
631f9c18 2884 INF("schedstat", S_IRUGO, proc_pid_schedstat),
28a6d671 2885#endif
9745512c 2886#ifdef CONFIG_LATENCYTOP
631f9c18 2887 REG("latency", S_IRUGO, proc_lstats_operations),
9745512c 2888#endif
8793d854 2889#ifdef CONFIG_PROC_PID_CPUSET
631f9c18 2890 REG("cpuset", S_IRUGO, proc_cpuset_operations),
a424316c
PM		 2891#endif
2892#ifdef CONFIG_CGROUPS
631f9c18 2893 REG("cgroup", S_IRUGO, proc_cgroup_operations),
28a6d671 2894#endif
631f9c18
AD		 2895 INF("oom_score", S_IRUGO, proc_oom_score),
2896 REG("oom_adj", S_IRUGO|S_IWUSR, proc_oom_adjust_operations),
a63d83f4 2897 REG("oom_score_adj", S_IRUGO|S_IWUSR, proc_oom_score_adj_operations),
28a6d671 2898#ifdef CONFIG_AUDITSYSCALL
631f9c18
AD		 2899 REG("loginuid", S_IWUSR|S_IRUGO, proc_loginuid_operations),
2900 REG("sessionid", S_IRUGO, proc_sessionid_operations),
28a6d671 2901#endif
f4f154fd 2902#ifdef CONFIG_FAULT_INJECTION
631f9c18 2903 REG("make-it-fail", S_IRUGO|S_IWUSR, proc_fault_inject_operations),
f4f154fd 2904#endif
698ba7b5 2905#ifdef CONFIG_ELF_CORE
631f9c18 2906 REG("coredump_filter", S_IRUGO|S_IWUSR, proc_coredump_filter_operations),
3cb4a0bb 2907#endif
aba76fdb 2908#ifdef CONFIG_TASK_IO_ACCOUNTING
1d1221f3 2909 INF("io", S_IRUSR, proc_tgid_io_accounting),
aba76fdb 2910#endif
f133ecca
CM		 2911#ifdef CONFIG_HARDWALL
2912 INF("hardwall", S_IRUGO, proc_pid_hardwall),
2913#endif
28a6d671 2914};
1da177e4 2915
28a6d671 2916static int proc_tgid_base_readdir(struct file * filp,
1da177e4
LT		 2917 void * dirent, filldir_t filldir)
2918{
2919 return proc_pident_readdir(filp,dirent,filldir,
28a6d671 2920 tgid_base_stuff,ARRAY_SIZE(tgid_base_stuff));
1da177e4
LT		 2921}
2922
00977a59 2923static const struct file_operations proc_tgid_base_operations = {
1da177e4 2924 .read = generic_read_dir,
28a6d671 2925 .readdir = proc_tgid_base_readdir,
6038f373 2926 .llseek = default_llseek,
1da177e4
LT		 2927};
2928
28a6d671 2929static struct dentry *proc_tgid_base_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd){
7bcd6b0e
EB		 2930 return proc_pident_lookup(dir, dentry,
2931 tgid_base_stuff, ARRAY_SIZE(tgid_base_stuff));
1da177e4
LT		 2932}
2933
c5ef1c42 2934static const struct inode_operations proc_tgid_base_inode_operations = {
28a6d671 2935 .lookup = proc_tgid_base_lookup,
99f89551 2936 .getattr = pid_getattr,
6d76fa58 2937 .setattr = proc_setattr,
1da177e4 2938};
1da177e4 2939
60347f67 2940static void proc_flush_task_mnt(struct vfsmount *mnt, pid_t pid, pid_t tgid)
1da177e4 2941{
48e6484d 2942 struct dentry *dentry, *leader, *dir;
8578cea7 2943 char buf[PROC_NUMBUF];
48e6484d
EB		 2944 struct qstr name;
2945
2946 name.name = buf;
60347f67
PE		 2947 name.len = snprintf(buf, sizeof(buf), "%d", pid);
2948 dentry = d_hash_and_lookup(mnt->mnt_root, &name);
48e6484d 2949 if (dentry) {
29f12ca3 2950 shrink_dcache_parent(dentry);
48e6484d
EB		 2951 d_drop(dentry);
2952 dput(dentry);
2953 }
1da177e4 2954
48e6484d 2955 name.name = buf;
60347f67
PE		 2956 name.len = snprintf(buf, sizeof(buf), "%d", tgid);
2957 leader = d_hash_and_lookup(mnt->mnt_root, &name);
48e6484d
EB		 2958 if (!leader)
2959 goto out;
1da177e4 2960
48e6484d
EB		 2961 name.name = "task";
2962 name.len = strlen(name.name);
2963 dir = d_hash_and_lookup(leader, &name);
2964 if (!dir)
2965 goto out_put_leader;
2966
2967 name.name = buf;
60347f67 2968 name.len = snprintf(buf, sizeof(buf), "%d", pid);
48e6484d
EB		 2969 dentry = d_hash_and_lookup(dir, &name);
2970 if (dentry) {
2971 shrink_dcache_parent(dentry);
2972 d_drop(dentry);
2973 dput(dentry);
1da177e4 2974 }
48e6484d
EB		 2975
2976 dput(dir);
2977out_put_leader:
2978 dput(leader);
2979out:
2980 return;
1da177e4
LT		 2981}
2982
0895e91d
RD		 2983/**
2984 * proc_flush_task - Remove dcache entries for @task from the /proc dcache.
2985 * @task: task that should be flushed.
2986 *
2987 * When flushing dentries from proc, one needs to flush them from global
60347f67 2988 * proc (proc_mnt) and from all the namespaces' procs this task was seen
0895e91d
RD		 2989 * in. This call is supposed to do all of this job.
2990 *
2991 * Looks in the dcache for
2992 * /proc/@pid
2993 * /proc/@tgid/task/@pid
2994 * if either directory is present flushes it and all of it'ts children
2995 * from the dcache.
2996 *
2997 * It is safe and reasonable to cache /proc entries for a task until
2998 * that task exits. After that they just clog up the dcache with
2999 * useless entries, possibly causing useful dcache entries to be
3000 * flushed instead. This routine is proved to flush those useless
3001 * dcache entries at process exit time.
3002 *
3003 * NOTE: This routine is just an optimization so it does not guarantee
3004 * that no dcache entries will exist at process exit time it
3005 * just makes it very unlikely that any will persist.
60347f67
PE		 3006 */
3007
3008void proc_flush_task(struct task_struct *task)
3009{
9fcc2d15 3010 int i;
9b4d1cbe 3011 struct pid *pid, *tgid;
130f77ec
PE		 3012 struct upid *upid;
3013
130f77ec 3014 pid = task_pid(task);
9b4d1cbe 3015 tgid = task_tgid(task);
130f77ec 3016
9fcc2d15 3017 for (i = 0; i <= pid->level; i++) {
130f77ec
PE		 3018 upid = &pid->numbers[i];
3019 proc_flush_task_mnt(upid->ns->proc_mnt, upid->nr,
9b4d1cbe 3020 tgid->numbers[i].nr);
130f77ec 3021 }
6f4e6433
PE		 3022
3023 upid = &pid->numbers[pid->level];
3024 if (upid->nr == 1)
3025 pid_ns_release_proc(upid->ns);
60347f67
PE		 3026}
3027
9711ef99
AB		 3028static struct dentry *proc_pid_instantiate(struct inode *dir,
3029 struct dentry * dentry,
c5141e6d 3030 struct task_struct *task, const void *ptr)
444ceed8
EB		 3031{
3032 struct dentry *error = ERR_PTR(-ENOENT);
3033 struct inode *inode;
3034
61a28784 3035 inode = proc_pid_make_inode(dir->i_sb, task);
444ceed8
EB		 3036 if (!inode)
3037 goto out;
3038
3039 inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO;
3040 inode->i_op = &proc_tgid_base_inode_operations;
3041 inode->i_fop = &proc_tgid_base_operations;
3042 inode->i_flags|=S_IMMUTABLE;
aed54175 3043
bfe86848
MS		 3044 set_nlink(inode, 2 + pid_entry_count_dirs(tgid_base_stuff,
3045 ARRAY_SIZE(tgid_base_stuff)));
444ceed8 3046
fb045adb 3047 d_set_d_op(dentry, &pid_dentry_operations);
444ceed8
EB		 3048
3049 d_add(dentry, inode);
3050 /* Close the race of the process dying before we return the dentry */
3051 if (pid_revalidate(dentry, NULL))
3052 error = NULL;
3053out:
3054 return error;
3055}
3056
1da177e4
LT		 3057struct dentry *proc_pid_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd)
3058{
73d36460 3059 struct dentry *result;
1da177e4 3060 struct task_struct *task;
1da177e4 3061 unsigned tgid;
b488893a 3062 struct pid_namespace *ns;
1da177e4 3063
801199ce
EB		 3064 result = proc_base_lookup(dir, dentry);
3065 if (!IS_ERR(result) || PTR_ERR(result) != -ENOENT)
3066 goto out;
3067
1da177e4
LT		 3068 tgid = name_to_int(dentry);
3069 if (tgid == ~0U)
3070 goto out;
3071
b488893a 3072 ns = dentry->d_sb->s_fs_info;
de758734 3073 rcu_read_lock();
b488893a 3074 task = find_task_by_pid_ns(tgid, ns);
1da177e4
LT		 3075 if (task)
3076 get_task_struct(task);
de758734 3077 rcu_read_unlock();
1da177e4
LT		 3078 if (!task)
3079 goto out;
3080
444ceed8 3081 result = proc_pid_instantiate(dir, dentry, task, NULL);
1da177e4 3082 put_task_struct(task);
1da177e4 3083out:
cd6a3ce9 3084 return result;
1da177e4
LT		 3085}
3086
1da177e4 3087/*
0804ef4b 3088 * Find the first task with tgid >= tgid
0bc58a91 3089 *
1da177e4 3090 */
19fd4bb2
EB		 3091struct tgid_iter {
3092 unsigned int tgid;
0804ef4b 3093 struct task_struct *task;
19fd4bb2
EB		 3094};
3095static struct tgid_iter next_tgid(struct pid_namespace *ns, struct tgid_iter iter)
3096{
0804ef4b 3097 struct pid *pid;
1da177e4 3098
19fd4bb2
EB		 3099 if (iter.task)
3100 put_task_struct(iter.task);
454cc105 3101 rcu_read_lock();
0804ef4b 3102retry:
19fd4bb2
EB		 3103 iter.task = NULL;
3104 pid = find_ge_pid(iter.tgid, ns);
0804ef4b 3105 if (pid) {
19fd4bb2
EB		 3106 iter.tgid = pid_nr_ns(pid, ns);
3107 iter.task = pid_task(pid, PIDTYPE_PID);
0804ef4b
EB		 3108 /* What we to know is if the pid we have find is the
3109 * pid of a thread_group_leader. Testing for task
3110 * being a thread_group_leader is the obvious thing
3111 * todo but there is a window when it fails, due to
3112 * the pid transfer logic in de_thread.
3113 *
3114 * So we perform the straight forward test of seeing
3115 * if the pid we have found is the pid of a thread
3116 * group leader, and don't worry if the task we have
3117 * found doesn't happen to be a thread group leader.
3118 * As we don't care in the case of readdir.
3119 */
19fd4bb2
EB		 3120 if (!iter.task || !has_group_leader_pid(iter.task)) {
3121 iter.tgid += 1;
0804ef4b 3122 goto retry;
19fd4bb2
EB		 3123 }
3124 get_task_struct(iter.task);
0bc58a91 3125 }
454cc105 3126 rcu_read_unlock();
19fd4bb2 3127 return iter;
1da177e4
LT		 3128}
3129
7bcd6b0e 3130#define TGID_OFFSET (FIRST_PROCESS_ENTRY + ARRAY_SIZE(proc_base_stuff))
0804ef4b 3131
61a28784 3132static int proc_pid_fill_cache(struct file *filp, void *dirent, filldir_t filldir,
19fd4bb2 3133 struct tgid_iter iter)
61a28784
EB		 3134{
3135 char name[PROC_NUMBUF];
19fd4bb2 3136 int len = snprintf(name, sizeof(name), "%d", iter.tgid);
61a28784 3137 return proc_fill_cache(filp, dirent, filldir, name, len,
19fd4bb2 3138 proc_pid_instantiate, iter.task, NULL);
61a28784
EB		 3139}
3140
1da177e4
LT		 3141/* for the /proc/ directory itself, after non-process stuff has been done */
3142int proc_pid_readdir(struct file * filp, void * dirent, filldir_t filldir)
3143{
d8bdc59f
LT		 3144 unsigned int nr;
3145 struct task_struct *reaper;
19fd4bb2 3146 struct tgid_iter iter;
b488893a 3147 struct pid_namespace *ns;
1da177e4 3148
d8bdc59f
LT		 3149 if (filp->f_pos >= PID_MAX_LIMIT + TGID_OFFSET)
3150 goto out_no_task;
3151 nr = filp->f_pos - FIRST_PROCESS_ENTRY;
3152
3153 reaper = get_proc_task(filp->f_path.dentry->d_inode);
61a28784
EB		 3154 if (!reaper)
3155 goto out_no_task;
3156
7bcd6b0e 3157 for (; nr < ARRAY_SIZE(proc_base_stuff); filp->f_pos++, nr++) {
c5141e6d 3158 const struct pid_entry *p = &proc_base_stuff[nr];
61a28784 3159 if (proc_base_fill_cache(filp, dirent, filldir, reaper, p) < 0)
801199ce 3160 goto out;
1da177e4
LT		 3161 }
3162
b488893a 3163 ns = filp->f_dentry->d_sb->s_fs_info;
19fd4bb2
EB		 3164 iter.task = NULL;
3165 iter.tgid = filp->f_pos - TGID_OFFSET;
3166 for (iter = next_tgid(ns, iter);
3167 iter.task;
3168 iter.tgid += 1, iter = next_tgid(ns, iter)) {
3169 filp->f_pos = iter.tgid + TGID_OFFSET;
3170 if (proc_pid_fill_cache(filp, dirent, filldir, iter) < 0) {
3171 put_task_struct(iter.task);
0804ef4b 3172 goto out;
1da177e4 3173 }
0bc58a91 3174 }
0804ef4b
EB		 3175 filp->f_pos = PID_MAX_LIMIT + TGID_OFFSET;
3176out:
61a28784
EB		 3177 put_task_struct(reaper);
3178out_no_task:
0bc58a91
EB		 3179 return 0;
3180}
1da177e4 3181
28a6d671
EB		 3182/*
3183 * Tasks
3184 */
c5141e6d 3185static const struct pid_entry tid_base_stuff[] = {
631f9c18 3186 DIR("fd", S_IRUSR|S_IXUSR, proc_fd_inode_operations, proc_fd_operations),
3835541d 3187 DIR("fdinfo", S_IRUSR|S_IXUSR, proc_fdinfo_inode_operations, proc_fdinfo_operations),
6b4e306a 3188 DIR("ns", S_IRUSR|S_IXUGO, proc_ns_dir_inode_operations, proc_ns_dir_operations),
631f9c18
AD		 3189 REG("environ", S_IRUSR, proc_environ_operations),
3190 INF("auxv", S_IRUSR, proc_pid_auxv),
3191 ONE("status", S_IRUGO, proc_pid_status),
a9712bc1 3192 ONE("personality", S_IRUGO, proc_pid_personality),
3036e7b4 3193 INF("limits", S_IRUGO, proc_pid_limits),
43ae34cb 3194#ifdef CONFIG_SCHED_DEBUG
631f9c18 3195 REG("sched", S_IRUGO|S_IWUSR, proc_pid_sched_operations),
ebcb6734 3196#endif
4614a696 3197 REG("comm", S_IRUGO|S_IWUSR, proc_pid_set_comm_operations),
ebcb6734 3198#ifdef CONFIG_HAVE_ARCH_TRACEHOOK
a9712bc1 3199 INF("syscall", S_IRUGO, proc_pid_syscall),
43ae34cb 3200#endif
631f9c18
AD		 3201 INF("cmdline", S_IRUGO, proc_pid_cmdline),
3202 ONE("stat", S_IRUGO, proc_tid_stat),
3203 ONE("statm", S_IRUGO, proc_pid_statm),
3204 REG("maps", S_IRUGO, proc_maps_operations),
28a6d671 3205#ifdef CONFIG_NUMA
631f9c18 3206 REG("numa_maps", S_IRUGO, proc_numa_maps_operations),
28a6d671 3207#endif
631f9c18
AD		 3208 REG("mem", S_IRUSR|S_IWUSR, proc_mem_operations),
3209 LNK("cwd", proc_cwd_link),
3210 LNK("root", proc_root_link),
3211 LNK("exe", proc_exe_link),
3212 REG("mounts", S_IRUGO, proc_mounts_operations),
3213 REG("mountinfo", S_IRUGO, proc_mountinfo_operations),
1e883281 3214#ifdef CONFIG_PROC_PAGE_MONITOR
631f9c18
AD		 3215 REG("clear_refs", S_IWUSR, proc_clear_refs_operations),
3216 REG("smaps", S_IRUGO, proc_smaps_operations),
ca6b0bf0 3217 REG("pagemap", S_IRUGO, proc_pagemap_operations),
28a6d671
EB		 3218#endif
3219#ifdef CONFIG_SECURITY
631f9c18 3220 DIR("attr", S_IRUGO|S_IXUGO, proc_attr_dir_inode_operations, proc_attr_dir_operations),
28a6d671
EB		 3221#endif
3222#ifdef CONFIG_KALLSYMS
631f9c18 3223 INF("wchan", S_IRUGO, proc_pid_wchan),
28a6d671 3224#endif
2ec220e2 3225#ifdef CONFIG_STACKTRACE
a9712bc1 3226 ONE("stack", S_IRUGO, proc_pid_stack),
28a6d671
EB		 3227#endif
3228#ifdef CONFIG_SCHEDSTATS
631f9c18 3229 INF("schedstat", S_IRUGO, proc_pid_schedstat),
28a6d671 3230#endif
9745512c 3231#ifdef CONFIG_LATENCYTOP
631f9c18 3232 REG("latency", S_IRUGO, proc_lstats_operations),
9745512c 3233#endif
8793d854 3234#ifdef CONFIG_PROC_PID_CPUSET
631f9c18 3235 REG("cpuset", S_IRUGO, proc_cpuset_operations),
a424316c
PM		 3236#endif
3237#ifdef CONFIG_CGROUPS
631f9c18 3238 REG("cgroup", S_IRUGO, proc_cgroup_operations),
28a6d671 3239#endif
631f9c18
AD		 3240 INF("oom_score", S_IRUGO, proc_oom_score),
3241 REG("oom_adj", S_IRUGO|S_IWUSR, proc_oom_adjust_operations),
a63d83f4 3242 REG("oom_score_adj", S_IRUGO|S_IWUSR, proc_oom_score_adj_operations),
28a6d671 3243#ifdef CONFIG_AUDITSYSCALL
631f9c18 3244 REG("loginuid", S_IWUSR|S_IRUGO, proc_loginuid_operations),
26ec3c64 3245 REG("sessionid", S_IRUGO, proc_sessionid_operations),
28a6d671 3246#endif
f4f154fd 3247#ifdef CONFIG_FAULT_INJECTION
631f9c18 3248 REG("make-it-fail", S_IRUGO|S_IWUSR, proc_fault_inject_operations),
f4f154fd 3249#endif
297c5d92 3250#ifdef CONFIG_TASK_IO_ACCOUNTING
1d1221f3 3251 INF("io", S_IRUSR, proc_tid_io_accounting),
297c5d92 3252#endif
f133ecca
CM		 3253#ifdef CONFIG_HARDWALL
3254 INF("hardwall", S_IRUGO, proc_pid_hardwall),
3255#endif
28a6d671
EB		 3256};
3257
3258static int proc_tid_base_readdir(struct file * filp,
3259 void * dirent, filldir_t filldir)
3260{
3261 return proc_pident_readdir(filp,dirent,filldir,
3262 tid_base_stuff,ARRAY_SIZE(tid_base_stuff));
3263}
3264
3265static struct dentry *proc_tid_base_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd){
7bcd6b0e
EB		 3266 return proc_pident_lookup(dir, dentry,
3267 tid_base_stuff, ARRAY_SIZE(tid_base_stuff));
28a6d671
EB		 3268}
3269
00977a59 3270static const struct file_operations proc_tid_base_operations = {
28a6d671
EB		 3271 .read = generic_read_dir,
3272 .readdir = proc_tid_base_readdir,
6038f373 3273 .llseek = default_llseek,
28a6d671
EB		 3274};
3275
c5ef1c42 3276static const struct inode_operations proc_tid_base_inode_operations = {
28a6d671
EB		 3277 .lookup = proc_tid_base_lookup,
3278 .getattr = pid_getattr,
3279 .setattr = proc_setattr,
3280};
3281
444ceed8 3282static struct dentry *proc_task_instantiate(struct inode *dir,
c5141e6d 3283 struct dentry *dentry, struct task_struct *task, const void *ptr)
444ceed8
EB		 3284{
3285 struct dentry *error = ERR_PTR(-ENOENT);
3286 struct inode *inode;
61a28784 3287 inode = proc_pid_make_inode(dir->i_sb, task);
444ceed8
EB		 3288
3289 if (!inode)
3290 goto out;
3291 inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO;
3292 inode->i_op = &proc_tid_base_inode_operations;
3293 inode->i_fop = &proc_tid_base_operations;
3294 inode->i_flags|=S_IMMUTABLE;
aed54175 3295
bfe86848
MS		 3296 set_nlink(inode, 2 + pid_entry_count_dirs(tid_base_stuff,
3297 ARRAY_SIZE(tid_base_stuff)));
444ceed8 3298
fb045adb 3299 d_set_d_op(dentry, &pid_dentry_operations);
444ceed8
EB		 3300
3301 d_add(dentry, inode);
3302 /* Close the race of the process dying before we return the dentry */
3303 if (pid_revalidate(dentry, NULL))
3304 error = NULL;
3305out:
3306 return error;
3307}
3308
28a6d671
EB		 3309static struct dentry *proc_task_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd)
3310{
3311 struct dentry *result = ERR_PTR(-ENOENT);
3312 struct task_struct *task;
3313 struct task_struct *leader = get_proc_task(dir);
28a6d671 3314 unsigned tid;
b488893a 3315 struct pid_namespace *ns;
28a6d671
EB		 3316
3317 if (!leader)
3318 goto out_no_task;
3319
3320 tid = name_to_int(dentry);
3321 if (tid == ~0U)
3322 goto out;
3323
b488893a 3324 ns = dentry->d_sb->s_fs_info;
28a6d671 3325 rcu_read_lock();
b488893a 3326 task = find_task_by_pid_ns(tid, ns);
28a6d671
EB		 3327 if (task)
3328 get_task_struct(task);
3329 rcu_read_unlock();
3330 if (!task)
3331 goto out;
bac0abd6 3332 if (!same_thread_group(leader, task))
28a6d671
EB		 3333 goto out_drop_task;
3334
444ceed8 3335 result = proc_task_instantiate(dir, dentry, task, NULL);
28a6d671
EB		 3336out_drop_task:
3337 put_task_struct(task);
3338out:
3339 put_task_struct(leader);
3340out_no_task:
3341 return result;
3342}
3343
0bc58a91
EB		 3344/*
3345 * Find the first tid of a thread group to return to user space.
3346 *
3347 * Usually this is just the thread group leader, but if the users
3348 * buffer was too small or there was a seek into the middle of the
3349 * directory we have more work todo.
3350 *
3351 * In the case of a short read we start with find_task_by_pid.
3352 *
3353 * In the case of a seek we start with the leader and walk nr
3354 * threads past it.
3355 */
cc288738 3356static struct task_struct *first_tid(struct task_struct *leader,
b488893a 3357 int tid, int nr, struct pid_namespace *ns)
0bc58a91 3358{
a872ff0c 3359 struct task_struct *pos;
1da177e4 3360
cc288738 3361 rcu_read_lock();
0bc58a91
EB		 3362 /* Attempt to start with the pid of a thread */
3363 if (tid && (nr > 0)) {
b488893a 3364 pos = find_task_by_pid_ns(tid, ns);
a872ff0c
ON		 3365 if (pos && (pos->group_leader == leader))
3366 goto found;
0bc58a91 3367 }
1da177e4 3368
0bc58a91 3369 /* If nr exceeds the number of threads there is nothing todo */
a872ff0c
ON		 3370 pos = NULL;
3371 if (nr && nr >= get_nr_threads(leader))
3372 goto out;
1da177e4 3373
a872ff0c
ON		 3374 /* If we haven't found our starting place yet start
3375 * with the leader and walk nr threads forward.
0bc58a91 3376 */
a872ff0c
ON		 3377 for (pos = leader; nr > 0; --nr) {
3378 pos = next_thread(pos);
3379 if (pos == leader) {
3380 pos = NULL;
3381 goto out;
3382 }
1da177e4 3383 }
a872ff0c
ON		 3384found:
3385 get_task_struct(pos);
3386out:
cc288738 3387 rcu_read_unlock();
0bc58a91
EB		 3388 return pos;
3389}
3390
3391/*
3392 * Find the next thread in the thread list.
3393 * Return NULL if there is an error or no next thread.
3394 *
3395 * The reference to the input task_struct is released.
3396 */
3397static struct task_struct *next_tid(struct task_struct *start)
3398{
c1df7fb8 3399 struct task_struct *pos = NULL;
cc288738 3400 rcu_read_lock();
c1df7fb8 3401 if (pid_alive(start)) {
0bc58a91 3402 pos = next_thread(start);
c1df7fb8
ON		 3403 if (thread_group_leader(pos))
3404 pos = NULL;
3405 else
3406 get_task_struct(pos);
3407 }
cc288738 3408 rcu_read_unlock();
0bc58a91
EB		 3409 put_task_struct(start);
3410 return pos;
1da177e4
LT		 3411}
3412
61a28784
EB		 3413static int proc_task_fill_cache(struct file *filp, void *dirent, filldir_t filldir,
3414 struct task_struct *task, int tid)
3415{
3416 char name[PROC_NUMBUF];
3417 int len = snprintf(name, sizeof(name), "%d", tid);
3418 return proc_fill_cache(filp, dirent, filldir, name, len,
3419 proc_task_instantiate, task, NULL);
3420}
3421
1da177e4
LT		 3422/* for the /proc/TGID/task/ directories */
3423static int proc_task_readdir(struct file * filp, void * dirent, filldir_t filldir)
3424{
2fddfeef 3425 struct dentry *dentry = filp->f_path.dentry;
1da177e4 3426 struct inode *inode = dentry->d_inode;
7d895244 3427 struct task_struct *leader = NULL;
0bc58a91 3428 struct task_struct *task;
1da177e4
LT		 3429 int retval = -ENOENT;
3430 ino_t ino;
0bc58a91 3431 int tid;
b488893a 3432 struct pid_namespace *ns;
1da177e4 3433
7d895244
GC		 3434 task = get_proc_task(inode);
3435 if (!task)
3436 goto out_no_task;
3437 rcu_read_lock();
3438 if (pid_alive(task)) {
3439 leader = task->group_leader;
3440 get_task_struct(leader);
3441 }
3442 rcu_read_unlock();
3443 put_task_struct(task);
99f89551
EB		 3444 if (!leader)
3445 goto out_no_task;
1da177e4
LT		 3446 retval = 0;
3447
ee568b25 3448 switch ((unsigned long)filp->f_pos) {
1da177e4
LT		 3449 case 0:
3450 ino = inode->i_ino;
ee6f779b 3451 if (filldir(dirent, ".", 1, filp->f_pos, ino, DT_DIR) < 0)
1da177e4 3452 goto out;
ee6f779b 3453 filp->f_pos++;
1da177e4
LT		 3454 /* fall through */
3455 case 1:
3456 ino = parent_ino(dentry);
ee6f779b 3457 if (filldir(dirent, "..", 2, filp->f_pos, ino, DT_DIR) < 0)
1da177e4 3458 goto out;
ee6f779b 3459 filp->f_pos++;
1da177e4
LT		 3460 /* fall through */
3461 }
3462
0bc58a91
EB		 3463 /* f_version caches the tgid value that the last readdir call couldn't
3464 * return. lseek aka telldir automagically resets f_version to 0.
3465 */
b488893a 3466 ns = filp->f_dentry->d_sb->s_fs_info;
2b47c361 3467 tid = (int)filp->f_version;
0bc58a91 3468 filp->f_version = 0;
ee6f779b 3469 for (task = first_tid(leader, tid, filp->f_pos - 2, ns);
0bc58a91 3470 task;
ee6f779b 3471 task = next_tid(task), filp->f_pos++) {
b488893a 3472 tid = task_pid_nr_ns(task, ns);
61a28784 3473 if (proc_task_fill_cache(filp, dirent, filldir, task, tid) < 0) {
0bc58a91
EB		 3474 /* returning this tgid failed, save it as the first
3475 * pid for the next readir call */
2b47c361 3476 filp->f_version = (u64)tid;
0bc58a91 3477 put_task_struct(task);
1da177e4 3478 break;
0bc58a91 3479 }
1da177e4
LT		 3480 }
3481out:
99f89551
EB		 3482 put_task_struct(leader);
3483out_no_task:
1da177e4
LT		 3484 return retval;
3485}
6e66b52b
EB		 3486
3487static int proc_task_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
3488{
3489 struct inode *inode = dentry->d_inode;
99f89551 3490 struct task_struct *p = get_proc_task(inode);
6e66b52b
EB		 3491 generic_fillattr(inode, stat);
3492
99f89551 3493 if (p) {
99f89551 3494 stat->nlink += get_nr_threads(p);
99f89551 3495 put_task_struct(p);
6e66b52b
EB		 3496 }
3497
3498 return 0;
3499}
28a6d671 3500
c5ef1c42 3501static const struct inode_operations proc_task_inode_operations = {
28a6d671
EB		 3502 .lookup = proc_task_lookup,
3503 .getattr = proc_task_getattr,
3504 .setattr = proc_setattr,
3505};
3506
00977a59 3507static const struct file_operations proc_task_operations = {
28a6d671
EB		 3508 .read = generic_read_dir,
3509 .readdir = proc_task_readdir,
6038f373 3510 .llseek = default_llseek,
28a6d671 3511};
Linux kernel - Deliverables
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