blob: 8418fcc0a6abd1efb58c0c66efdb1fef411d81d8 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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.
Mauricio Line070ad42005-09-03 15:55:10 -070014 *
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.
Linus Torvalds1da177e2005-04-16 15:20:36 -070048 */
49
50#include <asm/uaccess.h>
51
Linus Torvalds1da177e2005-04-16 15:20:36 -070052#include <linux/errno.h>
53#include <linux/time.h>
54#include <linux/proc_fs.h>
55#include <linux/stat.h>
Andrea Righi59954772008-07-27 17:29:15 +020056#include <linux/task_io_accounting_ops.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070057#include <linux/init.h>
Randy Dunlap16f7e0f2006-01-11 12:17:46 -080058#include <linux/capability.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070059#include <linux/file.h>
Al Viro9f3acc32008-04-24 07:44:08 -040060#include <linux/fdtable.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070061#include <linux/string.h>
62#include <linux/seq_file.h>
63#include <linux/namei.h>
Kirill Korotaev6b3286e2006-12-08 02:37:56 -080064#include <linux/mnt_namespace.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070065#include <linux/mm.h>
Dipankar Sarmab8359962005-09-09 13:04:14 -070066#include <linux/rcupdate.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070067#include <linux/kallsyms.h>
Ken Chen2ec220e2008-11-10 11:26:08 +030068#include <linux/stacktrace.h>
Neil Hormand85f50d2007-10-18 23:40:37 -070069#include <linux/resource.h>
Kees Cook5096add2007-05-08 00:26:04 -070070#include <linux/module.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070071#include <linux/mount.h>
72#include <linux/security.h>
73#include <linux/ptrace.h>
Roland McGrath0d094ef2008-07-25 19:45:49 -070074#include <linux/tracehook.h>
Paul Menagea4243162007-10-18 23:39:35 -070075#include <linux/cgroup.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070076#include <linux/cpuset.h>
77#include <linux/audit.h>
Al Viro5addc5d2005-11-07 17:15:49 -050078#include <linux/poll.h>
Serge E. Hallyn1651e142006-10-02 02:18:08 -070079#include <linux/nsproxy.h>
Alexey Dobriyan8ac773b2006-10-19 23:28:32 -070080#include <linux/oom.h>
Kawai, Hidehiro3cb4a0b2007-07-19 01:48:28 -070081#include <linux/elf.h>
Pavel Emelyanov60347f62007-10-18 23:40:03 -070082#include <linux/pid_namespace.h>
Al Viro5ad4e532009-03-29 19:50:06 -040083#include <linux/fs_struct.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090084#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070085#include "internal.h"
86
Eric W. Biederman0f2fe202006-06-26 00:25:46 -070087/* NOTE:
88 * Implementing inode permission operations in /proc is almost
89 * certainly an error. Permission checks need to happen during
90 * each system call not at open time. The reason is that most of
91 * what we wish to check for permissions in /proc varies at runtime.
92 *
93 * The classic example of a problem is opening file descriptors
94 * in /proc for a task before it execs a suid executable.
95 */
96
Linus Torvalds1da177e2005-04-16 15:20:36 -070097struct pid_entry {
Linus Torvalds1da177e2005-04-16 15:20:36 -070098 char *name;
Eric Dumazetc5141e62007-05-08 00:26:15 -070099 int len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100 mode_t mode;
Arjan van de Venc5ef1c42007-02-12 00:55:40 -0800101 const struct inode_operations *iop;
Arjan van de Ven00977a52007-02-12 00:55:34 -0800102 const struct file_operations *fop;
Eric W. Biederman20cdc892006-10-02 02:17:07 -0700103 union proc_op op;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104};
105
Eric W. Biederman61a28782006-10-02 02:18:49 -0700106#define NOD(NAME, MODE, IOP, FOP, OP) { \
Eric W. Biederman20cdc892006-10-02 02:17:07 -0700107 .name = (NAME), \
Eric Dumazetc5141e62007-05-08 00:26:15 -0700108 .len = sizeof(NAME) - 1, \
Eric W. Biederman20cdc892006-10-02 02:17:07 -0700109 .mode = MODE, \
110 .iop = IOP, \
111 .fop = FOP, \
112 .op = OP, \
113}
114
Alexey Dobriyan631f9c12008-11-10 01:32:52 +0300115#define DIR(NAME, MODE, iops, fops) \
116 NOD(NAME, (S_IFDIR|(MODE)), &iops, &fops, {} )
117#define LNK(NAME, get_link) \
Eric W. Biederman61a28782006-10-02 02:18:49 -0700118 NOD(NAME, (S_IFLNK|S_IRWXUGO), \
Eric W. Biederman20cdc892006-10-02 02:17:07 -0700119 &proc_pid_link_inode_operations, NULL, \
Alexey Dobriyan631f9c12008-11-10 01:32:52 +0300120 { .proc_get_link = get_link } )
121#define REG(NAME, MODE, fops) \
122 NOD(NAME, (S_IFREG|(MODE)), NULL, &fops, {})
123#define INF(NAME, MODE, read) \
Eric W. Biederman61a28782006-10-02 02:18:49 -0700124 NOD(NAME, (S_IFREG|(MODE)), \
Eric W. Biederman20cdc892006-10-02 02:17:07 -0700125 NULL, &proc_info_file_operations, \
Alexey Dobriyan631f9c12008-11-10 01:32:52 +0300126 { .proc_read = read } )
127#define ONE(NAME, MODE, show) \
Eric W. Biedermanbe614082008-02-08 04:18:30 -0800128 NOD(NAME, (S_IFREG|(MODE)), \
129 NULL, &proc_single_file_operations, \
Alexey Dobriyan631f9c12008-11-10 01:32:52 +0300130 { .proc_show = show } )
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131
Vegard Nossumaed54172008-06-05 22:46:53 -0700132/*
133 * Count the number of hardlinks for the pid_entry table, excluding the .
134 * and .. links.
135 */
136static unsigned int pid_entry_count_dirs(const struct pid_entry *entries,
137 unsigned int n)
138{
139 unsigned int i;
140 unsigned int count;
141
142 count = 0;
143 for (i = 0; i < n; ++i) {
144 if (S_ISDIR(entries[i].mode))
145 ++count;
146 }
147
148 return count;
149}
150
Hugh Dickins7c2c7d92009-03-28 23:21:27 +0000151static int get_fs_path(struct task_struct *task, struct path *path, bool root)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152{
153 struct fs_struct *fs;
Hugh Dickins7c2c7d92009-03-28 23:21:27 +0000154 int result = -ENOENT;
155
Miklos Szeredi0494f6e2005-09-06 15:18:22 -0700156 task_lock(task);
157 fs = task->fs;
Hugh Dickins7c2c7d92009-03-28 23:21:27 +0000158 if (fs) {
159 read_lock(&fs->lock);
160 *path = root ? fs->root : fs->pwd;
161 path_get(path);
162 read_unlock(&fs->lock);
163 result = 0;
164 }
Miklos Szeredi0494f6e2005-09-06 15:18:22 -0700165 task_unlock(task);
Hugh Dickins7c2c7d92009-03-28 23:21:27 +0000166 return result;
Miklos Szeredi0494f6e2005-09-06 15:18:22 -0700167}
168
Eric W. Biederman99f89552006-06-26 00:25:55 -0700169static int get_nr_threads(struct task_struct *tsk)
170{
Eric W. Biederman99f89552006-06-26 00:25:55 -0700171 unsigned long flags;
172 int count = 0;
173
174 if (lock_task_sighand(tsk, &flags)) {
175 count = atomic_read(&tsk->signal->count);
176 unlock_task_sighand(tsk, &flags);
177 }
178 return count;
179}
180
Jan Blunck3dcd25f2008-02-14 19:38:35 -0800181static int proc_cwd_link(struct inode *inode, struct path *path)
Miklos Szeredi0494f6e2005-09-06 15:18:22 -0700182{
Eric W. Biederman99f89552006-06-26 00:25:55 -0700183 struct task_struct *task = get_proc_task(inode);
Miklos Szeredi0494f6e2005-09-06 15:18:22 -0700184 int result = -ENOENT;
Eric W. Biederman99f89552006-06-26 00:25:55 -0700185
186 if (task) {
Hugh Dickins7c2c7d92009-03-28 23:21:27 +0000187 result = get_fs_path(task, path, 0);
Eric W. Biederman99f89552006-06-26 00:25:55 -0700188 put_task_struct(task);
189 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190 return result;
191}
192
Jan Blunck3dcd25f2008-02-14 19:38:35 -0800193static int proc_root_link(struct inode *inode, struct path *path)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194{
Eric W. Biederman99f89552006-06-26 00:25:55 -0700195 struct task_struct *task = get_proc_task(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196 int result = -ENOENT;
Eric W. Biederman99f89552006-06-26 00:25:55 -0700197
198 if (task) {
Hugh Dickins7c2c7d92009-03-28 23:21:27 +0000199 result = get_fs_path(task, path, 1);
Eric W. Biederman99f89552006-06-26 00:25:55 -0700200 put_task_struct(task);
201 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202 return result;
203}
204
Roland McGrath638fa2022008-04-29 01:01:38 -0700205/*
206 * Return zero if current may access user memory in @task, -error if not.
207 */
208static int check_mem_permission(struct task_struct *task)
209{
210 /*
211 * A task can always look at itself, in case it chooses
212 * to use system calls instead of load instructions.
213 */
214 if (task == current)
215 return 0;
216
217 /*
218 * If current is actively ptrace'ing, and would also be
219 * permitted to freshly attach with ptrace now, permit it.
220 */
Roland McGrath0d094ef2008-07-25 19:45:49 -0700221 if (task_is_stopped_or_traced(task)) {
222 int match;
223 rcu_read_lock();
224 match = (tracehook_tracer_task(task) == current);
225 rcu_read_unlock();
226 if (match && ptrace_may_access(task, PTRACE_MODE_ATTACH))
227 return 0;
228 }
Roland McGrath638fa2022008-04-29 01:01:38 -0700229
230 /*
231 * Noone else is allowed.
232 */
233 return -EPERM;
234}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235
Al Viro831830b2008-01-02 14:09:57 +0000236struct mm_struct *mm_for_maps(struct task_struct *task)
237{
Oleg Nesterov704b8362009-07-10 03:27:40 +0200238 struct mm_struct *mm;
Oleg Nesterov00f89d22009-07-10 03:27:38 +0200239
Oleg Nesterov704b8362009-07-10 03:27:40 +0200240 if (mutex_lock_killable(&task->cred_guard_mutex))
241 return NULL;
242
243 mm = get_task_mm(task);
244 if (mm && mm != current->mm &&
245 !ptrace_may_access(task, PTRACE_MODE_READ)) {
246 mmput(mm);
247 mm = NULL;
Oleg Nesterov13f0fea2009-06-23 21:25:32 +0200248 }
Oleg Nesterov704b8362009-07-10 03:27:40 +0200249 mutex_unlock(&task->cred_guard_mutex);
250
Al Viro831830b2008-01-02 14:09:57 +0000251 return mm;
Al Viro831830b2008-01-02 14:09:57 +0000252}
253
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254static int proc_pid_cmdline(struct task_struct *task, char * buffer)
255{
256 int res = 0;
257 unsigned int len;
258 struct mm_struct *mm = get_task_mm(task);
259 if (!mm)
260 goto out;
261 if (!mm->arg_end)
262 goto out_mm; /* Shh! No looking before we're done */
263
264 len = mm->arg_end - mm->arg_start;
265
266 if (len > PAGE_SIZE)
267 len = PAGE_SIZE;
268
269 res = access_process_vm(task, mm->arg_start, buffer, len, 0);
270
271 // If the nul at the end of args has been overwritten, then
272 // assume application is using setproctitle(3).
273 if (res > 0 && buffer[res-1] != '\0' && len < PAGE_SIZE) {
274 len = strnlen(buffer, res);
275 if (len < res) {
276 res = len;
277 } else {
278 len = mm->env_end - mm->env_start;
279 if (len > PAGE_SIZE - res)
280 len = PAGE_SIZE - res;
281 res += access_process_vm(task, mm->env_start, buffer+res, len, 0);
282 res = strnlen(buffer, res);
283 }
284 }
285out_mm:
286 mmput(mm);
287out:
288 return res;
289}
290
291static int proc_pid_auxv(struct task_struct *task, char *buffer)
292{
293 int res = 0;
294 struct mm_struct *mm = get_task_mm(task);
295 if (mm) {
296 unsigned int nwords = 0;
Hannes Ederdfe6b7d2008-12-30 18:49:13 +0300297 do {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298 nwords += 2;
Hannes Ederdfe6b7d2008-12-30 18:49:13 +0300299 } while (mm->saved_auxv[nwords - 2] != 0); /* AT_NULL */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300 res = nwords * sizeof(mm->saved_auxv[0]);
301 if (res > PAGE_SIZE)
302 res = PAGE_SIZE;
303 memcpy(buffer, mm->saved_auxv, res);
304 mmput(mm);
305 }
306 return res;
307}
308
309
310#ifdef CONFIG_KALLSYMS
311/*
312 * Provides a wchan file via kallsyms in a proper one-value-per-file format.
313 * Returns the resolved symbol. If that fails, simply return the address.
314 */
315static int proc_pid_wchan(struct task_struct *task, char *buffer)
316{
Alexey Dobriyanffb45122007-05-08 00:28:41 -0700317 unsigned long wchan;
Tejun Heo9281ace2007-07-17 04:03:51 -0700318 char symname[KSYM_NAME_LEN];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319
320 wchan = get_wchan(task);
321
Alexey Dobriyan9d65cb42007-05-08 00:28:43 -0700322 if (lookup_symbol_name(wchan, symname) < 0)
Jake Edgef83ce3e2009-05-04 12:51:14 -0600323 if (!ptrace_may_access(task, PTRACE_MODE_READ))
324 return 0;
325 else
326 return sprintf(buffer, "%lu", wchan);
Alexey Dobriyan9d65cb42007-05-08 00:28:43 -0700327 else
328 return sprintf(buffer, "%s", symname);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329}
330#endif /* CONFIG_KALLSYMS */
331
Ken Chen2ec220e2008-11-10 11:26:08 +0300332#ifdef CONFIG_STACKTRACE
333
334#define MAX_STACK_TRACE_DEPTH 64
335
336static int proc_pid_stack(struct seq_file *m, struct pid_namespace *ns,
337 struct pid *pid, struct task_struct *task)
338{
339 struct stack_trace trace;
340 unsigned long *entries;
341 int i;
342
343 entries = kmalloc(MAX_STACK_TRACE_DEPTH * sizeof(*entries), GFP_KERNEL);
344 if (!entries)
345 return -ENOMEM;
346
347 trace.nr_entries = 0;
348 trace.max_entries = MAX_STACK_TRACE_DEPTH;
349 trace.entries = entries;
350 trace.skip = 0;
351 save_stack_trace_tsk(task, &trace);
352
353 for (i = 0; i < trace.nr_entries; i++) {
354 seq_printf(m, "[<%p>] %pS\n",
355 (void *)entries[i], (void *)entries[i]);
356 }
357 kfree(entries);
358
359 return 0;
360}
361#endif
362
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363#ifdef CONFIG_SCHEDSTATS
364/*
365 * Provides /proc/PID/schedstat
366 */
367static int proc_pid_schedstat(struct task_struct *task, char *buffer)
368{
Balbir Singh172ba842007-07-09 18:52:00 +0200369 return sprintf(buffer, "%llu %llu %lu\n",
Ingo Molnar826e08b2008-12-22 07:37:41 +0100370 (unsigned long long)task->se.sum_exec_runtime,
371 (unsigned long long)task->sched_info.run_delay,
Ingo Molnar2d723762007-10-15 17:00:12 +0200372 task->sched_info.pcount);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373}
374#endif
375
Arjan van de Ven97455122008-01-25 21:08:34 +0100376#ifdef CONFIG_LATENCYTOP
377static int lstats_show_proc(struct seq_file *m, void *v)
378{
379 int i;
Hiroshi Shimamoto13d77c32008-02-20 16:53:29 -0800380 struct inode *inode = m->private;
381 struct task_struct *task = get_proc_task(inode);
Arjan van de Ven97455122008-01-25 21:08:34 +0100382
Hiroshi Shimamoto13d77c32008-02-20 16:53:29 -0800383 if (!task)
384 return -ESRCH;
385 seq_puts(m, "Latency Top version : v0.1\n");
Arjan van de Ven97455122008-01-25 21:08:34 +0100386 for (i = 0; i < 32; i++) {
387 if (task->latency_record[i].backtrace[0]) {
388 int q;
389 seq_printf(m, "%i %li %li ",
390 task->latency_record[i].count,
391 task->latency_record[i].time,
392 task->latency_record[i].max);
393 for (q = 0; q < LT_BACKTRACEDEPTH; q++) {
Hugh Dickins9c246242008-12-09 13:14:27 -0800394 char sym[KSYM_SYMBOL_LEN];
Arjan van de Ven97455122008-01-25 21:08:34 +0100395 char *c;
396 if (!task->latency_record[i].backtrace[q])
397 break;
398 if (task->latency_record[i].backtrace[q] == ULONG_MAX)
399 break;
400 sprint_symbol(sym, task->latency_record[i].backtrace[q]);
401 c = strchr(sym, '+');
402 if (c)
403 *c = 0;
404 seq_printf(m, "%s ", sym);
405 }
406 seq_printf(m, "\n");
407 }
408
409 }
Hiroshi Shimamoto13d77c32008-02-20 16:53:29 -0800410 put_task_struct(task);
Arjan van de Ven97455122008-01-25 21:08:34 +0100411 return 0;
412}
413
414static int lstats_open(struct inode *inode, struct file *file)
415{
Hiroshi Shimamoto13d77c32008-02-20 16:53:29 -0800416 return single_open(file, lstats_show_proc, inode);
Hiroshi Shimamotod6643d12008-02-14 10:27:00 -0800417}
418
Arjan van de Ven97455122008-01-25 21:08:34 +0100419static ssize_t lstats_write(struct file *file, const char __user *buf,
420 size_t count, loff_t *offs)
421{
Hiroshi Shimamoto13d77c32008-02-20 16:53:29 -0800422 struct task_struct *task = get_proc_task(file->f_dentry->d_inode);
Arjan van de Ven97455122008-01-25 21:08:34 +0100423
Hiroshi Shimamoto13d77c32008-02-20 16:53:29 -0800424 if (!task)
425 return -ESRCH;
Arjan van de Ven97455122008-01-25 21:08:34 +0100426 clear_all_latency_tracing(task);
Hiroshi Shimamoto13d77c32008-02-20 16:53:29 -0800427 put_task_struct(task);
Arjan van de Ven97455122008-01-25 21:08:34 +0100428
429 return count;
430}
431
432static const struct file_operations proc_lstats_operations = {
433 .open = lstats_open,
434 .read = seq_read,
435 .write = lstats_write,
436 .llseek = seq_lseek,
Hiroshi Shimamoto13d77c32008-02-20 16:53:29 -0800437 .release = single_release,
Arjan van de Ven97455122008-01-25 21:08:34 +0100438};
439
440#endif
441
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442/* The badness from the OOM killer */
443unsigned long badness(struct task_struct *p, unsigned long uptime);
444static int proc_oom_score(struct task_struct *task, char *buffer)
445{
Oleg Nesterovb95c35e2010-04-01 15:13:57 +0200446 unsigned long points = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447 struct timespec uptime;
448
449 do_posix_clock_monotonic_gettime(&uptime);
Alexey Dobriyan19c5d452007-05-08 00:26:46 -0700450 read_lock(&tasklist_lock);
Oleg Nesterovb95c35e2010-04-01 15:13:57 +0200451 if (pid_alive(task))
452 points = badness(task, uptime.tv_sec);
Alexey Dobriyan19c5d452007-05-08 00:26:46 -0700453 read_unlock(&tasklist_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454 return sprintf(buffer, "%lu\n", points);
455}
456
Neil Hormand85f50d2007-10-18 23:40:37 -0700457struct limit_names {
458 char *name;
459 char *unit;
460};
461
462static const struct limit_names lnames[RLIM_NLIMITS] = {
Kees Cookcff4edb2009-09-22 16:45:32 -0700463 [RLIMIT_CPU] = {"Max cpu time", "seconds"},
Neil Hormand85f50d2007-10-18 23:40:37 -0700464 [RLIMIT_FSIZE] = {"Max file size", "bytes"},
465 [RLIMIT_DATA] = {"Max data size", "bytes"},
466 [RLIMIT_STACK] = {"Max stack size", "bytes"},
467 [RLIMIT_CORE] = {"Max core file size", "bytes"},
468 [RLIMIT_RSS] = {"Max resident set", "bytes"},
469 [RLIMIT_NPROC] = {"Max processes", "processes"},
470 [RLIMIT_NOFILE] = {"Max open files", "files"},
471 [RLIMIT_MEMLOCK] = {"Max locked memory", "bytes"},
472 [RLIMIT_AS] = {"Max address space", "bytes"},
473 [RLIMIT_LOCKS] = {"Max file locks", "locks"},
474 [RLIMIT_SIGPENDING] = {"Max pending signals", "signals"},
475 [RLIMIT_MSGQUEUE] = {"Max msgqueue size", "bytes"},
476 [RLIMIT_NICE] = {"Max nice priority", NULL},
477 [RLIMIT_RTPRIO] = {"Max realtime priority", NULL},
Eugene Teo88081172008-02-23 15:23:52 -0800478 [RLIMIT_RTTIME] = {"Max realtime timeout", "us"},
Neil Hormand85f50d2007-10-18 23:40:37 -0700479};
480
481/* Display limits for a process */
482static int proc_pid_limits(struct task_struct *task, char *buffer)
483{
484 unsigned int i;
485 int count = 0;
486 unsigned long flags;
487 char *bufptr = buffer;
488
489 struct rlimit rlim[RLIM_NLIMITS];
490
Lai Jiangshana6bebbc2008-10-05 00:51:15 +0400491 if (!lock_task_sighand(task, &flags))
Neil Hormand85f50d2007-10-18 23:40:37 -0700492 return 0;
Neil Hormand85f50d2007-10-18 23:40:37 -0700493 memcpy(rlim, task->signal->rlim, sizeof(struct rlimit) * RLIM_NLIMITS);
494 unlock_task_sighand(task, &flags);
Neil Hormand85f50d2007-10-18 23:40:37 -0700495
496 /*
497 * print the file header
498 */
499 count += sprintf(&bufptr[count], "%-25s %-20s %-20s %-10s\n",
500 "Limit", "Soft Limit", "Hard Limit", "Units");
501
502 for (i = 0; i < RLIM_NLIMITS; i++) {
503 if (rlim[i].rlim_cur == RLIM_INFINITY)
504 count += sprintf(&bufptr[count], "%-25s %-20s ",
505 lnames[i].name, "unlimited");
506 else
507 count += sprintf(&bufptr[count], "%-25s %-20lu ",
508 lnames[i].name, rlim[i].rlim_cur);
509
510 if (rlim[i].rlim_max == RLIM_INFINITY)
511 count += sprintf(&bufptr[count], "%-20s ", "unlimited");
512 else
513 count += sprintf(&bufptr[count], "%-20lu ",
514 rlim[i].rlim_max);
515
516 if (lnames[i].unit)
517 count += sprintf(&bufptr[count], "%-10s\n",
518 lnames[i].unit);
519 else
520 count += sprintf(&bufptr[count], "\n");
521 }
522
523 return count;
524}
525
Roland McGrathebcb6732008-07-25 19:46:00 -0700526#ifdef CONFIG_HAVE_ARCH_TRACEHOOK
527static int proc_pid_syscall(struct task_struct *task, char *buffer)
528{
529 long nr;
530 unsigned long args[6], sp, pc;
531
532 if (task_current_syscall(task, &nr, args, 6, &sp, &pc))
533 return sprintf(buffer, "running\n");
534
535 if (nr < 0)
536 return sprintf(buffer, "%ld 0x%lx 0x%lx\n", nr, sp, pc);
537
538 return sprintf(buffer,
539 "%ld 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx\n",
540 nr,
541 args[0], args[1], args[2], args[3], args[4], args[5],
542 sp, pc);
543}
544#endif /* CONFIG_HAVE_ARCH_TRACEHOOK */
545
Linus Torvalds1da177e2005-04-16 15:20:36 -0700546/************************************************************************/
547/* Here the fs part begins */
548/************************************************************************/
549
550/* permission checks */
Eric W. Biederman778c1142006-06-26 00:25:58 -0700551static int proc_fd_access_allowed(struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700552{
Eric W. Biederman778c1142006-06-26 00:25:58 -0700553 struct task_struct *task;
554 int allowed = 0;
Eric W. Biedermandf26c402006-06-26 00:25:59 -0700555 /* Allow access to a task's file descriptors if it is us or we
556 * may use ptrace attach to the process and find out that
557 * information.
Eric W. Biederman778c1142006-06-26 00:25:58 -0700558 */
559 task = get_proc_task(inode);
Eric W. Biedermandf26c402006-06-26 00:25:59 -0700560 if (task) {
Stephen Smalley006ebb42008-05-19 08:32:49 -0400561 allowed = ptrace_may_access(task, PTRACE_MODE_READ);
Eric W. Biederman778c1142006-06-26 00:25:58 -0700562 put_task_struct(task);
Eric W. Biedermandf26c402006-06-26 00:25:59 -0700563 }
Eric W. Biederman778c1142006-06-26 00:25:58 -0700564 return allowed;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565}
566
Linus Torvalds6d76fa52006-07-15 12:26:45 -0700567static int proc_setattr(struct dentry *dentry, struct iattr *attr)
568{
569 int error;
570 struct inode *inode = dentry->d_inode;
571
572 if (attr->ia_valid & ATTR_MODE)
573 return -EPERM;
574
575 error = inode_change_ok(inode, attr);
John Johansen1e8123f2007-05-08 00:29:41 -0700576 if (!error)
577 error = inode_setattr(inode, attr);
Linus Torvalds6d76fa52006-07-15 12:26:45 -0700578 return error;
579}
580
Arjan van de Venc5ef1c42007-02-12 00:55:40 -0800581static const struct inode_operations proc_def_inode_operations = {
Linus Torvalds6d76fa52006-07-15 12:26:45 -0700582 .setattr = proc_setattr,
583};
584
Miklos Szeredia1a2c402008-03-27 13:06:24 +0100585static int mounts_open_common(struct inode *inode, struct file *file,
586 const struct seq_operations *op)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700587{
Eric W. Biederman99f89552006-06-26 00:25:55 -0700588 struct task_struct *task = get_proc_task(inode);
Pavel Emelyanovcf7b7082007-10-18 23:39:54 -0700589 struct nsproxy *nsp;
Kirill Korotaev6b3286e2006-12-08 02:37:56 -0800590 struct mnt_namespace *ns = NULL;
Miklos Szeredia1a2c402008-03-27 13:06:24 +0100591 struct path root;
Al Viro5addc5d2005-11-07 17:15:49 -0500592 struct proc_mounts *p;
593 int ret = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700594
Eric W. Biederman99f89552006-06-26 00:25:55 -0700595 if (task) {
Pavel Emelyanovcf7b7082007-10-18 23:39:54 -0700596 rcu_read_lock();
597 nsp = task_nsproxy(task);
598 if (nsp) {
599 ns = nsp->mnt_ns;
Alexey Dobriyan863c4702007-01-26 00:56:53 -0800600 if (ns)
601 get_mnt_ns(ns);
602 }
Pavel Emelyanovcf7b7082007-10-18 23:39:54 -0700603 rcu_read_unlock();
Hugh Dickins7c2c7d92009-03-28 23:21:27 +0000604 if (ns && get_fs_path(task, &root, 1) == 0)
605 ret = 0;
Eric W. Biederman99f89552006-06-26 00:25:55 -0700606 put_task_struct(task);
607 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700608
Miklos Szeredia1a2c402008-03-27 13:06:24 +0100609 if (!ns)
610 goto err;
Hugh Dickins7c2c7d92009-03-28 23:21:27 +0000611 if (ret)
Miklos Szeredia1a2c402008-03-27 13:06:24 +0100612 goto err_put_ns;
613
Miklos Szeredia1a2c402008-03-27 13:06:24 +0100614 ret = -ENOMEM;
615 p = kmalloc(sizeof(struct proc_mounts), GFP_KERNEL);
616 if (!p)
617 goto err_put_path;
618
619 file->private_data = &p->m;
620 ret = seq_open(file, op);
621 if (ret)
622 goto err_free;
623
624 p->m.private = p;
625 p->ns = ns;
626 p->root = root;
627 p->event = ns->event;
628
629 return 0;
630
631 err_free:
632 kfree(p);
633 err_put_path:
634 path_put(&root);
635 err_put_ns:
636 put_mnt_ns(ns);
637 err:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700638 return ret;
639}
640
641static int mounts_release(struct inode *inode, struct file *file)
642{
Miklos Szeredia1a2c402008-03-27 13:06:24 +0100643 struct proc_mounts *p = file->private_data;
644 path_put(&p->root);
645 put_mnt_ns(p->ns);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700646 return seq_release(inode, file);
647}
648
Al Viro5addc5d2005-11-07 17:15:49 -0500649static unsigned mounts_poll(struct file *file, poll_table *wait)
650{
651 struct proc_mounts *p = file->private_data;
KOSAKI Motohiro31b07092009-04-09 13:57:59 +0900652 unsigned res = POLLIN | POLLRDNORM;
Al Viro5addc5d2005-11-07 17:15:49 -0500653
Al Viro9f5596a2010-02-05 00:40:25 -0500654 poll_wait(file, &p->ns->poll, wait);
655 if (mnt_had_events(p))
KOSAKI Motohiro31b07092009-04-09 13:57:59 +0900656 res |= POLLERR | POLLPRI;
Al Viro5addc5d2005-11-07 17:15:49 -0500657
658 return res;
659}
660
Miklos Szeredia1a2c402008-03-27 13:06:24 +0100661static int mounts_open(struct inode *inode, struct file *file)
662{
663 return mounts_open_common(inode, file, &mounts_op);
664}
665
Arjan van de Ven00977a52007-02-12 00:55:34 -0800666static const struct file_operations proc_mounts_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700667 .open = mounts_open,
668 .read = seq_read,
669 .llseek = seq_lseek,
670 .release = mounts_release,
Al Viro5addc5d2005-11-07 17:15:49 -0500671 .poll = mounts_poll,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700672};
673
Ram Pai2d4d4862008-03-27 13:06:25 +0100674static int mountinfo_open(struct inode *inode, struct file *file)
675{
676 return mounts_open_common(inode, file, &mountinfo_op);
677}
678
679static const struct file_operations proc_mountinfo_operations = {
680 .open = mountinfo_open,
681 .read = seq_read,
682 .llseek = seq_lseek,
683 .release = mounts_release,
684 .poll = mounts_poll,
685};
686
Chuck Leverb4629fe2006-03-20 13:44:12 -0500687static int mountstats_open(struct inode *inode, struct file *file)
688{
Miklos Szeredia1a2c402008-03-27 13:06:24 +0100689 return mounts_open_common(inode, file, &mountstats_op);
Chuck Leverb4629fe2006-03-20 13:44:12 -0500690}
691
Arjan van de Ven00977a52007-02-12 00:55:34 -0800692static const struct file_operations proc_mountstats_operations = {
Chuck Leverb4629fe2006-03-20 13:44:12 -0500693 .open = mountstats_open,
694 .read = seq_read,
695 .llseek = seq_lseek,
696 .release = mounts_release,
697};
698
Linus Torvalds1da177e2005-04-16 15:20:36 -0700699#define PROC_BLOCK_SIZE (3*1024) /* 4K page size but our output routines use some slack for overruns */
700
701static ssize_t proc_info_read(struct file * file, char __user * buf,
702 size_t count, loff_t *ppos)
703{
Josef "Jeff" Sipek2fddfee2006-12-08 02:36:36 -0800704 struct inode * inode = file->f_path.dentry->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700705 unsigned long page;
706 ssize_t length;
Eric W. Biederman99f89552006-06-26 00:25:55 -0700707 struct task_struct *task = get_proc_task(inode);
708
709 length = -ESRCH;
710 if (!task)
711 goto out_no_task;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700712
713 if (count > PROC_BLOCK_SIZE)
714 count = PROC_BLOCK_SIZE;
Eric W. Biederman99f89552006-06-26 00:25:55 -0700715
716 length = -ENOMEM;
Mel Gormane12ba742007-10-16 01:25:52 -0700717 if (!(page = __get_free_page(GFP_TEMPORARY)))
Eric W. Biederman99f89552006-06-26 00:25:55 -0700718 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700719
720 length = PROC_I(inode)->op.proc_read(task, (char*)page);
721
722 if (length >= 0)
723 length = simple_read_from_buffer(buf, count, ppos, (char *)page, length);
724 free_page(page);
Eric W. Biederman99f89552006-06-26 00:25:55 -0700725out:
726 put_task_struct(task);
727out_no_task:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700728 return length;
729}
730
Arjan van de Ven00977a52007-02-12 00:55:34 -0800731static const struct file_operations proc_info_file_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700732 .read = proc_info_read,
733};
734
Eric W. Biedermanbe614082008-02-08 04:18:30 -0800735static int proc_single_show(struct seq_file *m, void *v)
736{
737 struct inode *inode = m->private;
738 struct pid_namespace *ns;
739 struct pid *pid;
740 struct task_struct *task;
741 int ret;
742
743 ns = inode->i_sb->s_fs_info;
744 pid = proc_pid(inode);
745 task = get_pid_task(pid, PIDTYPE_PID);
746 if (!task)
747 return -ESRCH;
748
749 ret = PROC_I(inode)->op.proc_show(m, ns, pid, task);
750
751 put_task_struct(task);
752 return ret;
753}
754
755static int proc_single_open(struct inode *inode, struct file *filp)
756{
757 int ret;
758 ret = single_open(filp, proc_single_show, NULL);
759 if (!ret) {
760 struct seq_file *m = filp->private_data;
761
762 m->private = inode;
763 }
764 return ret;
765}
766
767static const struct file_operations proc_single_file_operations = {
768 .open = proc_single_open,
769 .read = seq_read,
770 .llseek = seq_lseek,
771 .release = single_release,
772};
773
Linus Torvalds1da177e2005-04-16 15:20:36 -0700774static int mem_open(struct inode* inode, struct file* file)
775{
776 file->private_data = (void*)((long)current->self_exec_id);
777 return 0;
778}
779
780static ssize_t mem_read(struct file * file, char __user * buf,
781 size_t count, loff_t *ppos)
782{
Josef "Jeff" Sipek2fddfee2006-12-08 02:36:36 -0800783 struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700784 char *page;
785 unsigned long src = *ppos;
786 int ret = -ESRCH;
787 struct mm_struct *mm;
788
Eric W. Biederman99f89552006-06-26 00:25:55 -0700789 if (!task)
790 goto out_no_task;
791
Roland McGrath638fa2022008-04-29 01:01:38 -0700792 if (check_mem_permission(task))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700793 goto out;
794
795 ret = -ENOMEM;
Mel Gormane12ba742007-10-16 01:25:52 -0700796 page = (char *)__get_free_page(GFP_TEMPORARY);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700797 if (!page)
798 goto out;
799
800 ret = 0;
801
802 mm = get_task_mm(task);
803 if (!mm)
804 goto out_free;
805
806 ret = -EIO;
807
808 if (file->private_data != (void*)((long)current->self_exec_id))
809 goto out_put;
810
811 ret = 0;
812
813 while (count > 0) {
814 int this_len, retval;
815
816 this_len = (count > PAGE_SIZE) ? PAGE_SIZE : count;
817 retval = access_process_vm(task, src, page, this_len, 0);
Roland McGrath638fa2022008-04-29 01:01:38 -0700818 if (!retval || check_mem_permission(task)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700819 if (!ret)
820 ret = -EIO;
821 break;
822 }
823
824 if (copy_to_user(buf, page, retval)) {
825 ret = -EFAULT;
826 break;
827 }
828
829 ret += retval;
830 src += retval;
831 buf += retval;
832 count -= retval;
833 }
834 *ppos = src;
835
836out_put:
837 mmput(mm);
838out_free:
839 free_page((unsigned long) page);
840out:
Eric W. Biederman99f89552006-06-26 00:25:55 -0700841 put_task_struct(task);
842out_no_task:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700843 return ret;
844}
845
846#define mem_write NULL
847
848#ifndef mem_write
849/* This is a security hazard */
Glauber de Oliveira Costa63967fa2007-02-20 13:58:12 -0800850static ssize_t mem_write(struct file * file, const char __user *buf,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700851 size_t count, loff_t *ppos)
852{
Frederik Deweerdtf7ca54f2006-09-29 02:01:02 -0700853 int copied;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700854 char *page;
Josef "Jeff" Sipek2fddfee2006-12-08 02:36:36 -0800855 struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700856 unsigned long dst = *ppos;
857
Eric W. Biederman99f89552006-06-26 00:25:55 -0700858 copied = -ESRCH;
859 if (!task)
860 goto out_no_task;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700861
Roland McGrath638fa2022008-04-29 01:01:38 -0700862 if (check_mem_permission(task))
Eric W. Biederman99f89552006-06-26 00:25:55 -0700863 goto out;
864
865 copied = -ENOMEM;
Mel Gormane12ba742007-10-16 01:25:52 -0700866 page = (char *)__get_free_page(GFP_TEMPORARY);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700867 if (!page)
Eric W. Biederman99f89552006-06-26 00:25:55 -0700868 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700869
Frederik Deweerdtf7ca54f2006-09-29 02:01:02 -0700870 copied = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700871 while (count > 0) {
872 int this_len, retval;
873
874 this_len = (count > PAGE_SIZE) ? PAGE_SIZE : count;
875 if (copy_from_user(page, buf, this_len)) {
876 copied = -EFAULT;
877 break;
878 }
879 retval = access_process_vm(task, dst, page, this_len, 1);
880 if (!retval) {
881 if (!copied)
882 copied = -EIO;
883 break;
884 }
885 copied += retval;
886 buf += retval;
887 dst += retval;
888 count -= retval;
889 }
890 *ppos = dst;
891 free_page((unsigned long) page);
Eric W. Biederman99f89552006-06-26 00:25:55 -0700892out:
893 put_task_struct(task);
894out_no_task:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700895 return copied;
896}
897#endif
898
Matt Mackall85863e42008-02-04 22:29:04 -0800899loff_t mem_lseek(struct file *file, loff_t offset, int orig)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700900{
901 switch (orig) {
902 case 0:
903 file->f_pos = offset;
904 break;
905 case 1:
906 file->f_pos += offset;
907 break;
908 default:
909 return -EINVAL;
910 }
911 force_successful_syscall_return();
912 return file->f_pos;
913}
914
Arjan van de Ven00977a52007-02-12 00:55:34 -0800915static const struct file_operations proc_mem_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700916 .llseek = mem_lseek,
917 .read = mem_read,
918 .write = mem_write,
919 .open = mem_open,
920};
921
James Pearson315e28c2007-10-16 23:30:17 -0700922static ssize_t environ_read(struct file *file, char __user *buf,
923 size_t count, loff_t *ppos)
924{
925 struct task_struct *task = get_proc_task(file->f_dentry->d_inode);
926 char *page;
927 unsigned long src = *ppos;
928 int ret = -ESRCH;
929 struct mm_struct *mm;
930
931 if (!task)
932 goto out_no_task;
933
Stephen Smalley006ebb42008-05-19 08:32:49 -0400934 if (!ptrace_may_access(task, PTRACE_MODE_READ))
James Pearson315e28c2007-10-16 23:30:17 -0700935 goto out;
936
937 ret = -ENOMEM;
938 page = (char *)__get_free_page(GFP_TEMPORARY);
939 if (!page)
940 goto out;
941
942 ret = 0;
943
944 mm = get_task_mm(task);
945 if (!mm)
946 goto out_free;
947
948 while (count > 0) {
949 int this_len, retval, max_len;
950
951 this_len = mm->env_end - (mm->env_start + src);
952
953 if (this_len <= 0)
954 break;
955
956 max_len = (count > PAGE_SIZE) ? PAGE_SIZE : count;
957 this_len = (this_len > max_len) ? max_len : this_len;
958
959 retval = access_process_vm(task, (mm->env_start + src),
960 page, this_len, 0);
961
962 if (retval <= 0) {
963 ret = retval;
964 break;
965 }
966
967 if (copy_to_user(buf, page, retval)) {
968 ret = -EFAULT;
969 break;
970 }
971
972 ret += retval;
973 src += retval;
974 buf += retval;
975 count -= retval;
976 }
977 *ppos = src;
978
979 mmput(mm);
980out_free:
981 free_page((unsigned long) page);
982out:
983 put_task_struct(task);
984out_no_task:
985 return ret;
986}
987
988static const struct file_operations proc_environ_operations = {
989 .read = environ_read,
990};
991
Linus Torvalds1da177e2005-04-16 15:20:36 -0700992static ssize_t oom_adjust_read(struct file *file, char __user *buf,
993 size_t count, loff_t *ppos)
994{
Josef "Jeff" Sipek2fddfee2006-12-08 02:36:36 -0800995 struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode);
Eric W. Biederman8578cea2006-06-26 00:25:54 -0700996 char buffer[PROC_NUMBUF];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700997 size_t len;
KOSAKI Motohiro28b83c52009-09-21 17:03:13 -0700998 int oom_adjust = OOM_DISABLE;
999 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001000
Eric W. Biederman99f89552006-06-26 00:25:55 -07001001 if (!task)
1002 return -ESRCH;
KOSAKI Motohiro28b83c52009-09-21 17:03:13 -07001003
1004 if (lock_task_sighand(task, &flags)) {
1005 oom_adjust = task->signal->oom_adj;
1006 unlock_task_sighand(task, &flags);
1007 }
1008
Eric W. Biederman99f89552006-06-26 00:25:55 -07001009 put_task_struct(task);
1010
Eric W. Biederman8578cea2006-06-26 00:25:54 -07001011 len = snprintf(buffer, sizeof(buffer), "%i\n", oom_adjust);
Akinobu Mita0c28f282007-05-08 00:31:41 -07001012
1013 return simple_read_from_buffer(buf, count, ppos, buffer, len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001014}
1015
1016static ssize_t oom_adjust_write(struct file *file, const char __user *buf,
1017 size_t count, loff_t *ppos)
1018{
Eric W. Biederman99f89552006-06-26 00:25:55 -07001019 struct task_struct *task;
KOSAKI Motohiro5d863b82009-09-21 17:03:16 -07001020 char buffer[PROC_NUMBUF];
1021 long oom_adjust;
KOSAKI Motohiro28b83c52009-09-21 17:03:13 -07001022 unsigned long flags;
KOSAKI Motohiro5d863b82009-09-21 17:03:16 -07001023 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001024
Eric W. Biederman8578cea2006-06-26 00:25:54 -07001025 memset(buffer, 0, sizeof(buffer));
1026 if (count > sizeof(buffer) - 1)
1027 count = sizeof(buffer) - 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001028 if (copy_from_user(buffer, buf, count))
1029 return -EFAULT;
KOSAKI Motohiro5d863b82009-09-21 17:03:16 -07001030
1031 err = strict_strtol(strstrip(buffer), 0, &oom_adjust);
1032 if (err)
1033 return -EINVAL;
Alexey Dobriyan8ac773b2006-10-19 23:28:32 -07001034 if ((oom_adjust < OOM_ADJUST_MIN || oom_adjust > OOM_ADJUST_MAX) &&
1035 oom_adjust != OOM_DISABLE)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001036 return -EINVAL;
KOSAKI Motohiro5d863b82009-09-21 17:03:16 -07001037
Josef "Jeff" Sipek2fddfee2006-12-08 02:36:36 -08001038 task = get_proc_task(file->f_path.dentry->d_inode);
Eric W. Biederman99f89552006-06-26 00:25:55 -07001039 if (!task)
1040 return -ESRCH;
KOSAKI Motohiro28b83c52009-09-21 17:03:13 -07001041 if (!lock_task_sighand(task, &flags)) {
1042 put_task_struct(task);
1043 return -ESRCH;
1044 }
1045
1046 if (oom_adjust < task->signal->oom_adj && !capable(CAP_SYS_RESOURCE)) {
1047 unlock_task_sighand(task, &flags);
Guillem Jover8fb4fc62006-12-06 20:32:24 -08001048 put_task_struct(task);
1049 return -EACCES;
1050 }
KOSAKI Motohiro28b83c52009-09-21 17:03:13 -07001051
1052 task->signal->oom_adj = oom_adjust;
1053
1054 unlock_task_sighand(task, &flags);
Eric W. Biederman99f89552006-06-26 00:25:55 -07001055 put_task_struct(task);
KOSAKI Motohiro5d863b82009-09-21 17:03:16 -07001056
1057 return count;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001058}
1059
Arjan van de Ven00977a52007-02-12 00:55:34 -08001060static const struct file_operations proc_oom_adjust_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001061 .read = oom_adjust_read,
1062 .write = oom_adjust_write,
1063};
1064
Linus Torvalds1da177e2005-04-16 15:20:36 -07001065#ifdef CONFIG_AUDITSYSCALL
1066#define TMPBUFLEN 21
1067static ssize_t proc_loginuid_read(struct file * file, char __user * buf,
1068 size_t count, loff_t *ppos)
1069{
Josef "Jeff" Sipek2fddfee2006-12-08 02:36:36 -08001070 struct inode * inode = file->f_path.dentry->d_inode;
Eric W. Biederman99f89552006-06-26 00:25:55 -07001071 struct task_struct *task = get_proc_task(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001072 ssize_t length;
1073 char tmpbuf[TMPBUFLEN];
1074
Eric W. Biederman99f89552006-06-26 00:25:55 -07001075 if (!task)
1076 return -ESRCH;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001077 length = scnprintf(tmpbuf, TMPBUFLEN, "%u",
Al Viro0c11b942008-01-10 04:20:52 -05001078 audit_get_loginuid(task));
Eric W. Biederman99f89552006-06-26 00:25:55 -07001079 put_task_struct(task);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001080 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1081}
1082
1083static ssize_t proc_loginuid_write(struct file * file, const char __user * buf,
1084 size_t count, loff_t *ppos)
1085{
Josef "Jeff" Sipek2fddfee2006-12-08 02:36:36 -08001086 struct inode * inode = file->f_path.dentry->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001087 char *page, *tmp;
1088 ssize_t length;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001089 uid_t loginuid;
1090
1091 if (!capable(CAP_AUDIT_CONTROL))
1092 return -EPERM;
1093
Paul E. McKenney7dc52152010-02-22 17:04:52 -08001094 rcu_read_lock();
1095 if (current != pid_task(proc_pid(inode), PIDTYPE_PID)) {
1096 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001097 return -EPERM;
Paul E. McKenney7dc52152010-02-22 17:04:52 -08001098 }
1099 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001100
Al Viroe0182902006-05-18 08:28:02 -04001101 if (count >= PAGE_SIZE)
1102 count = PAGE_SIZE - 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001103
1104 if (*ppos != 0) {
1105 /* No partial writes. */
1106 return -EINVAL;
1107 }
Mel Gormane12ba742007-10-16 01:25:52 -07001108 page = (char*)__get_free_page(GFP_TEMPORARY);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001109 if (!page)
1110 return -ENOMEM;
1111 length = -EFAULT;
1112 if (copy_from_user(page, buf, count))
1113 goto out_free_page;
1114
Al Viroe0182902006-05-18 08:28:02 -04001115 page[count] = '\0';
Linus Torvalds1da177e2005-04-16 15:20:36 -07001116 loginuid = simple_strtoul(page, &tmp, 10);
1117 if (tmp == page) {
1118 length = -EINVAL;
1119 goto out_free_page;
1120
1121 }
Eric W. Biederman99f89552006-06-26 00:25:55 -07001122 length = audit_set_loginuid(current, loginuid);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001123 if (likely(length == 0))
1124 length = count;
1125
1126out_free_page:
1127 free_page((unsigned long) page);
1128 return length;
1129}
1130
Arjan van de Ven00977a52007-02-12 00:55:34 -08001131static const struct file_operations proc_loginuid_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001132 .read = proc_loginuid_read,
1133 .write = proc_loginuid_write,
1134};
Eric Paris1e0bd752008-03-13 08:15:31 -04001135
1136static ssize_t proc_sessionid_read(struct file * file, char __user * buf,
1137 size_t count, loff_t *ppos)
1138{
1139 struct inode * inode = file->f_path.dentry->d_inode;
1140 struct task_struct *task = get_proc_task(inode);
1141 ssize_t length;
1142 char tmpbuf[TMPBUFLEN];
1143
1144 if (!task)
1145 return -ESRCH;
1146 length = scnprintf(tmpbuf, TMPBUFLEN, "%u",
1147 audit_get_sessionid(task));
1148 put_task_struct(task);
1149 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1150}
1151
1152static const struct file_operations proc_sessionid_operations = {
1153 .read = proc_sessionid_read,
1154};
Linus Torvalds1da177e2005-04-16 15:20:36 -07001155#endif
1156
Akinobu Mitaf4f154f2006-12-08 02:39:47 -08001157#ifdef CONFIG_FAULT_INJECTION
1158static ssize_t proc_fault_inject_read(struct file * file, char __user * buf,
1159 size_t count, loff_t *ppos)
1160{
1161 struct task_struct *task = get_proc_task(file->f_dentry->d_inode);
1162 char buffer[PROC_NUMBUF];
1163 size_t len;
1164 int make_it_fail;
Akinobu Mitaf4f154f2006-12-08 02:39:47 -08001165
1166 if (!task)
1167 return -ESRCH;
1168 make_it_fail = task->make_it_fail;
1169 put_task_struct(task);
1170
1171 len = snprintf(buffer, sizeof(buffer), "%i\n", make_it_fail);
Akinobu Mita0c28f282007-05-08 00:31:41 -07001172
1173 return simple_read_from_buffer(buf, count, ppos, buffer, len);
Akinobu Mitaf4f154f2006-12-08 02:39:47 -08001174}
1175
1176static ssize_t proc_fault_inject_write(struct file * file,
1177 const char __user * buf, size_t count, loff_t *ppos)
1178{
1179 struct task_struct *task;
1180 char buffer[PROC_NUMBUF], *end;
1181 int make_it_fail;
1182
1183 if (!capable(CAP_SYS_RESOURCE))
1184 return -EPERM;
1185 memset(buffer, 0, sizeof(buffer));
1186 if (count > sizeof(buffer) - 1)
1187 count = sizeof(buffer) - 1;
1188 if (copy_from_user(buffer, buf, count))
1189 return -EFAULT;
Vincent Licba8aaf2009-09-22 16:45:38 -07001190 make_it_fail = simple_strtol(strstrip(buffer), &end, 0);
1191 if (*end)
1192 return -EINVAL;
Akinobu Mitaf4f154f2006-12-08 02:39:47 -08001193 task = get_proc_task(file->f_dentry->d_inode);
1194 if (!task)
1195 return -ESRCH;
1196 task->make_it_fail = make_it_fail;
1197 put_task_struct(task);
Vincent Licba8aaf2009-09-22 16:45:38 -07001198
1199 return count;
Akinobu Mitaf4f154f2006-12-08 02:39:47 -08001200}
1201
Arjan van de Ven00977a52007-02-12 00:55:34 -08001202static const struct file_operations proc_fault_inject_operations = {
Akinobu Mitaf4f154f2006-12-08 02:39:47 -08001203 .read = proc_fault_inject_read,
1204 .write = proc_fault_inject_write,
1205};
1206#endif
1207
Arjan van de Ven97455122008-01-25 21:08:34 +01001208
Ingo Molnar43ae34c2007-07-09 18:52:00 +02001209#ifdef CONFIG_SCHED_DEBUG
1210/*
1211 * Print out various scheduling related per-task fields:
1212 */
1213static int sched_show(struct seq_file *m, void *v)
1214{
1215 struct inode *inode = m->private;
1216 struct task_struct *p;
1217
Ingo Molnar43ae34c2007-07-09 18:52:00 +02001218 p = get_proc_task(inode);
1219 if (!p)
1220 return -ESRCH;
1221 proc_sched_show_task(p, m);
1222
1223 put_task_struct(p);
1224
1225 return 0;
1226}
1227
1228static ssize_t
1229sched_write(struct file *file, const char __user *buf,
1230 size_t count, loff_t *offset)
1231{
1232 struct inode *inode = file->f_path.dentry->d_inode;
1233 struct task_struct *p;
1234
Ingo Molnar43ae34c2007-07-09 18:52:00 +02001235 p = get_proc_task(inode);
1236 if (!p)
1237 return -ESRCH;
1238 proc_sched_set_task(p);
1239
1240 put_task_struct(p);
1241
1242 return count;
1243}
1244
1245static int sched_open(struct inode *inode, struct file *filp)
1246{
1247 int ret;
1248
1249 ret = single_open(filp, sched_show, NULL);
1250 if (!ret) {
1251 struct seq_file *m = filp->private_data;
1252
1253 m->private = inode;
1254 }
1255 return ret;
1256}
1257
1258static const struct file_operations proc_pid_sched_operations = {
1259 .open = sched_open,
1260 .read = seq_read,
1261 .write = sched_write,
1262 .llseek = seq_lseek,
Alexey Dobriyan5ea473a2007-07-31 00:38:50 -07001263 .release = single_release,
Ingo Molnar43ae34c2007-07-09 18:52:00 +02001264};
1265
1266#endif
1267
john stultz4614a696b2009-12-14 18:00:05 -08001268static ssize_t comm_write(struct file *file, const char __user *buf,
1269 size_t count, loff_t *offset)
1270{
1271 struct inode *inode = file->f_path.dentry->d_inode;
1272 struct task_struct *p;
1273 char buffer[TASK_COMM_LEN];
1274
1275 memset(buffer, 0, sizeof(buffer));
1276 if (count > sizeof(buffer) - 1)
1277 count = sizeof(buffer) - 1;
1278 if (copy_from_user(buffer, buf, count))
1279 return -EFAULT;
1280
1281 p = get_proc_task(inode);
1282 if (!p)
1283 return -ESRCH;
1284
1285 if (same_thread_group(current, p))
1286 set_task_comm(p, buffer);
1287 else
1288 count = -EINVAL;
1289
1290 put_task_struct(p);
1291
1292 return count;
1293}
1294
1295static int comm_show(struct seq_file *m, void *v)
1296{
1297 struct inode *inode = m->private;
1298 struct task_struct *p;
1299
1300 p = get_proc_task(inode);
1301 if (!p)
1302 return -ESRCH;
1303
1304 task_lock(p);
1305 seq_printf(m, "%s\n", p->comm);
1306 task_unlock(p);
1307
1308 put_task_struct(p);
1309
1310 return 0;
1311}
1312
1313static int comm_open(struct inode *inode, struct file *filp)
1314{
1315 int ret;
1316
1317 ret = single_open(filp, comm_show, NULL);
1318 if (!ret) {
1319 struct seq_file *m = filp->private_data;
1320
1321 m->private = inode;
1322 }
1323 return ret;
1324}
1325
1326static const struct file_operations proc_pid_set_comm_operations = {
1327 .open = comm_open,
1328 .read = seq_read,
1329 .write = comm_write,
1330 .llseek = seq_lseek,
1331 .release = single_release,
1332};
1333
Matt Helsley925d1c42008-04-29 01:01:36 -07001334/*
1335 * We added or removed a vma mapping the executable. The vmas are only mapped
1336 * during exec and are not mapped with the mmap system call.
1337 * Callers must hold down_write() on the mm's mmap_sem for these
1338 */
1339void added_exe_file_vma(struct mm_struct *mm)
1340{
1341 mm->num_exe_file_vmas++;
1342}
1343
1344void removed_exe_file_vma(struct mm_struct *mm)
1345{
1346 mm->num_exe_file_vmas--;
1347 if ((mm->num_exe_file_vmas == 0) && mm->exe_file){
1348 fput(mm->exe_file);
1349 mm->exe_file = NULL;
1350 }
1351
1352}
1353
1354void set_mm_exe_file(struct mm_struct *mm, struct file *new_exe_file)
1355{
1356 if (new_exe_file)
1357 get_file(new_exe_file);
1358 if (mm->exe_file)
1359 fput(mm->exe_file);
1360 mm->exe_file = new_exe_file;
1361 mm->num_exe_file_vmas = 0;
1362}
1363
1364struct file *get_mm_exe_file(struct mm_struct *mm)
1365{
1366 struct file *exe_file;
1367
1368 /* We need mmap_sem to protect against races with removal of
1369 * VM_EXECUTABLE vmas */
1370 down_read(&mm->mmap_sem);
1371 exe_file = mm->exe_file;
1372 if (exe_file)
1373 get_file(exe_file);
1374 up_read(&mm->mmap_sem);
1375 return exe_file;
1376}
1377
1378void dup_mm_exe_file(struct mm_struct *oldmm, struct mm_struct *newmm)
1379{
1380 /* It's safe to write the exe_file pointer without exe_file_lock because
1381 * this is called during fork when the task is not yet in /proc */
1382 newmm->exe_file = get_mm_exe_file(oldmm);
1383}
1384
1385static int proc_exe_link(struct inode *inode, struct path *exe_path)
1386{
1387 struct task_struct *task;
1388 struct mm_struct *mm;
1389 struct file *exe_file;
1390
1391 task = get_proc_task(inode);
1392 if (!task)
1393 return -ENOENT;
1394 mm = get_task_mm(task);
1395 put_task_struct(task);
1396 if (!mm)
1397 return -ENOENT;
1398 exe_file = get_mm_exe_file(mm);
1399 mmput(mm);
1400 if (exe_file) {
1401 *exe_path = exe_file->f_path;
1402 path_get(&exe_file->f_path);
1403 fput(exe_file);
1404 return 0;
1405 } else
1406 return -ENOENT;
1407}
1408
Al Viro008b1502005-08-20 00:17:39 +01001409static void *proc_pid_follow_link(struct dentry *dentry, struct nameidata *nd)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001410{
1411 struct inode *inode = dentry->d_inode;
1412 int error = -EACCES;
1413
1414 /* We don't need a base pointer in the /proc filesystem */
Jan Blunck1d957f92008-02-14 19:34:35 -08001415 path_put(&nd->path);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001416
Eric W. Biederman778c1142006-06-26 00:25:58 -07001417 /* Are we allowed to snoop on the tasks file descriptors? */
1418 if (!proc_fd_access_allowed(inode))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001419 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001420
Jan Blunck3dcd25f2008-02-14 19:38:35 -08001421 error = PROC_I(inode)->op.proc_get_link(inode, &nd->path);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001422out:
Al Viro008b1502005-08-20 00:17:39 +01001423 return ERR_PTR(error);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001424}
1425
Jan Blunck3dcd25f2008-02-14 19:38:35 -08001426static int do_proc_readlink(struct path *path, char __user *buffer, int buflen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001427{
Mel Gormane12ba742007-10-16 01:25:52 -07001428 char *tmp = (char*)__get_free_page(GFP_TEMPORARY);
Jan Blunck3dcd25f2008-02-14 19:38:35 -08001429 char *pathname;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001430 int len;
1431
1432 if (!tmp)
1433 return -ENOMEM;
Akinobu Mita0c28f282007-05-08 00:31:41 -07001434
Jan Blunckcf28b482008-02-14 19:38:44 -08001435 pathname = d_path(path, tmp, PAGE_SIZE);
Jan Blunck3dcd25f2008-02-14 19:38:35 -08001436 len = PTR_ERR(pathname);
1437 if (IS_ERR(pathname))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001438 goto out;
Jan Blunck3dcd25f2008-02-14 19:38:35 -08001439 len = tmp + PAGE_SIZE - 1 - pathname;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001440
1441 if (len > buflen)
1442 len = buflen;
Jan Blunck3dcd25f2008-02-14 19:38:35 -08001443 if (copy_to_user(buffer, pathname, len))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001444 len = -EFAULT;
1445 out:
1446 free_page((unsigned long)tmp);
1447 return len;
1448}
1449
1450static int proc_pid_readlink(struct dentry * dentry, char __user * buffer, int buflen)
1451{
1452 int error = -EACCES;
1453 struct inode *inode = dentry->d_inode;
Jan Blunck3dcd25f2008-02-14 19:38:35 -08001454 struct path path;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001455
Eric W. Biederman778c1142006-06-26 00:25:58 -07001456 /* Are we allowed to snoop on the tasks file descriptors? */
1457 if (!proc_fd_access_allowed(inode))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001458 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001459
Jan Blunck3dcd25f2008-02-14 19:38:35 -08001460 error = PROC_I(inode)->op.proc_get_link(inode, &path);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001461 if (error)
1462 goto out;
1463
Jan Blunck3dcd25f2008-02-14 19:38:35 -08001464 error = do_proc_readlink(&path, buffer, buflen);
1465 path_put(&path);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001466out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001467 return error;
1468}
1469
Arjan van de Venc5ef1c42007-02-12 00:55:40 -08001470static const struct inode_operations proc_pid_link_inode_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001471 .readlink = proc_pid_readlink,
Linus Torvalds6d76fa52006-07-15 12:26:45 -07001472 .follow_link = proc_pid_follow_link,
1473 .setattr = proc_setattr,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001474};
1475
Eric W. Biederman28a6d672006-10-02 02:17:05 -07001476
1477/* building an inode */
1478
1479static int task_dumpable(struct task_struct *task)
1480{
1481 int dumpable = 0;
1482 struct mm_struct *mm;
1483
1484 task_lock(task);
1485 mm = task->mm;
1486 if (mm)
Kawai, Hidehiro6c5d5232007-07-19 01:48:27 -07001487 dumpable = get_dumpable(mm);
Eric W. Biederman28a6d672006-10-02 02:17:05 -07001488 task_unlock(task);
1489 if(dumpable == 1)
1490 return 1;
1491 return 0;
1492}
1493
1494
Eric W. Biederman61a28782006-10-02 02:18:49 -07001495static struct inode *proc_pid_make_inode(struct super_block * sb, struct task_struct *task)
Eric W. Biederman28a6d672006-10-02 02:17:05 -07001496{
1497 struct inode * inode;
1498 struct proc_inode *ei;
David Howellsc69e8d92008-11-14 10:39:19 +11001499 const struct cred *cred;
Eric W. Biederman28a6d672006-10-02 02:17:05 -07001500
1501 /* We need a new inode */
1502
1503 inode = new_inode(sb);
1504 if (!inode)
1505 goto out;
1506
1507 /* Common stuff */
1508 ei = PROC_I(inode);
1509 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
Eric W. Biederman28a6d672006-10-02 02:17:05 -07001510 inode->i_op = &proc_def_inode_operations;
1511
1512 /*
1513 * grab the reference to task.
1514 */
Oleg Nesterov1a657f782006-10-02 02:18:59 -07001515 ei->pid = get_task_pid(task, PIDTYPE_PID);
Eric W. Biederman28a6d672006-10-02 02:17:05 -07001516 if (!ei->pid)
1517 goto out_unlock;
1518
Eric W. Biederman28a6d672006-10-02 02:17:05 -07001519 if (task_dumpable(task)) {
David Howellsc69e8d92008-11-14 10:39:19 +11001520 rcu_read_lock();
1521 cred = __task_cred(task);
1522 inode->i_uid = cred->euid;
1523 inode->i_gid = cred->egid;
1524 rcu_read_unlock();
Eric W. Biederman28a6d672006-10-02 02:17:05 -07001525 }
1526 security_task_to_inode(task, inode);
1527
1528out:
1529 return inode;
1530
1531out_unlock:
1532 iput(inode);
1533 return NULL;
1534}
1535
1536static int pid_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
1537{
1538 struct inode *inode = dentry->d_inode;
1539 struct task_struct *task;
David Howellsc69e8d92008-11-14 10:39:19 +11001540 const struct cred *cred;
1541
Eric W. Biederman28a6d672006-10-02 02:17:05 -07001542 generic_fillattr(inode, stat);
1543
1544 rcu_read_lock();
1545 stat->uid = 0;
1546 stat->gid = 0;
1547 task = pid_task(proc_pid(inode), PIDTYPE_PID);
1548 if (task) {
1549 if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) ||
1550 task_dumpable(task)) {
David Howellsc69e8d92008-11-14 10:39:19 +11001551 cred = __task_cred(task);
1552 stat->uid = cred->euid;
1553 stat->gid = cred->egid;
Eric W. Biederman28a6d672006-10-02 02:17:05 -07001554 }
1555 }
1556 rcu_read_unlock();
1557 return 0;
1558}
1559
1560/* dentry stuff */
1561
1562/*
1563 * Exceptional case: normally we are not allowed to unhash a busy
1564 * directory. In this case, however, we can do it - no aliasing problems
1565 * due to the way we treat inodes.
1566 *
1567 * Rewrite the inode's ownerships here because the owning task may have
1568 * performed a setuid(), etc.
1569 *
1570 * Before the /proc/pid/status file was created the only way to read
1571 * the effective uid of a /process was to stat /proc/pid. Reading
1572 * /proc/pid/status is slow enough that procps and other packages
1573 * kept stating /proc/pid. To keep the rules in /proc simple I have
1574 * made this apply to all per process world readable and executable
1575 * directories.
1576 */
1577static int pid_revalidate(struct dentry *dentry, struct nameidata *nd)
1578{
1579 struct inode *inode = dentry->d_inode;
1580 struct task_struct *task = get_proc_task(inode);
David Howellsc69e8d92008-11-14 10:39:19 +11001581 const struct cred *cred;
1582
Eric W. Biederman28a6d672006-10-02 02:17:05 -07001583 if (task) {
1584 if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) ||
1585 task_dumpable(task)) {
David Howellsc69e8d92008-11-14 10:39:19 +11001586 rcu_read_lock();
1587 cred = __task_cred(task);
1588 inode->i_uid = cred->euid;
1589 inode->i_gid = cred->egid;
1590 rcu_read_unlock();
Eric W. Biederman28a6d672006-10-02 02:17:05 -07001591 } else {
1592 inode->i_uid = 0;
1593 inode->i_gid = 0;
1594 }
1595 inode->i_mode &= ~(S_ISUID | S_ISGID);
1596 security_task_to_inode(task, inode);
1597 put_task_struct(task);
1598 return 1;
1599 }
1600 d_drop(dentry);
1601 return 0;
1602}
1603
1604static int pid_delete_dentry(struct dentry * dentry)
1605{
1606 /* Is the task we represent dead?
1607 * If so, then don't put the dentry on the lru list,
1608 * kill it immediately.
1609 */
1610 return !proc_pid(dentry->d_inode)->tasks[PIDTYPE_PID].first;
1611}
1612
Al Virod72f71e2009-02-20 05:58:47 +00001613static const struct dentry_operations pid_dentry_operations =
Eric W. Biederman28a6d672006-10-02 02:17:05 -07001614{
1615 .d_revalidate = pid_revalidate,
1616 .d_delete = pid_delete_dentry,
1617};
1618
1619/* Lookups */
1620
Eric Dumazetc5141e62007-05-08 00:26:15 -07001621typedef struct dentry *instantiate_t(struct inode *, struct dentry *,
1622 struct task_struct *, const void *);
Eric W. Biederman61a28782006-10-02 02:18:49 -07001623
Eric W. Biederman1c0d04c2006-10-02 02:18:57 -07001624/*
1625 * Fill a directory entry.
1626 *
1627 * If possible create the dcache entry and derive our inode number and
1628 * file type from dcache entry.
1629 *
1630 * Since all of the proc inode numbers are dynamically generated, the inode
1631 * numbers do not exist until the inode is cache. This means creating the
1632 * the dcache entry in readdir is necessary to keep the inode numbers
1633 * reported by readdir in sync with the inode numbers reported
1634 * by stat.
1635 */
Eric W. Biederman61a28782006-10-02 02:18:49 -07001636static int proc_fill_cache(struct file *filp, void *dirent, filldir_t filldir,
1637 char *name, int len,
Eric Dumazetc5141e62007-05-08 00:26:15 -07001638 instantiate_t instantiate, struct task_struct *task, const void *ptr)
Eric W. Biederman61a28782006-10-02 02:18:49 -07001639{
Josef "Jeff" Sipek2fddfee2006-12-08 02:36:36 -08001640 struct dentry *child, *dir = filp->f_path.dentry;
Eric W. Biederman61a28782006-10-02 02:18:49 -07001641 struct inode *inode;
1642 struct qstr qname;
1643 ino_t ino = 0;
1644 unsigned type = DT_UNKNOWN;
1645
1646 qname.name = name;
1647 qname.len = len;
1648 qname.hash = full_name_hash(name, len);
1649
1650 child = d_lookup(dir, &qname);
1651 if (!child) {
1652 struct dentry *new;
1653 new = d_alloc(dir, &qname);
1654 if (new) {
1655 child = instantiate(dir->d_inode, new, task, ptr);
1656 if (child)
1657 dput(new);
1658 else
1659 child = new;
1660 }
1661 }
1662 if (!child || IS_ERR(child) || !child->d_inode)
1663 goto end_instantiate;
1664 inode = child->d_inode;
1665 if (inode) {
1666 ino = inode->i_ino;
1667 type = inode->i_mode >> 12;
1668 }
1669 dput(child);
1670end_instantiate:
1671 if (!ino)
1672 ino = find_inode_number(dir, &qname);
1673 if (!ino)
1674 ino = 1;
1675 return filldir(dirent, name, len, filp->f_pos, ino, type);
1676}
1677
Eric W. Biederman28a6d672006-10-02 02:17:05 -07001678static unsigned name_to_int(struct dentry *dentry)
1679{
1680 const char *name = dentry->d_name.name;
1681 int len = dentry->d_name.len;
1682 unsigned n = 0;
1683
1684 if (len > 1 && *name == '0')
1685 goto out;
1686 while (len-- > 0) {
1687 unsigned c = *name++ - '0';
1688 if (c > 9)
1689 goto out;
1690 if (n >= (~0U-9)/10)
1691 goto out;
1692 n *= 10;
1693 n += c;
1694 }
1695 return n;
1696out:
1697 return ~0U;
1698}
1699
Miklos Szeredi27932742007-05-08 00:26:17 -07001700#define PROC_FDINFO_MAX 64
1701
Jan Blunck3dcd25f2008-02-14 19:38:35 -08001702static int proc_fd_info(struct inode *inode, struct path *path, char *info)
Eric W. Biederman28a6d672006-10-02 02:17:05 -07001703{
1704 struct task_struct *task = get_proc_task(inode);
1705 struct files_struct *files = NULL;
1706 struct file *file;
1707 int fd = proc_fd(inode);
1708
1709 if (task) {
1710 files = get_files_struct(task);
1711 put_task_struct(task);
1712 }
1713 if (files) {
1714 /*
1715 * We are not taking a ref to the file structure, so we must
1716 * hold ->file_lock.
1717 */
1718 spin_lock(&files->file_lock);
1719 file = fcheck_files(files, fd);
1720 if (file) {
Jan Blunck3dcd25f2008-02-14 19:38:35 -08001721 if (path) {
1722 *path = file->f_path;
1723 path_get(&file->f_path);
1724 }
Miklos Szeredi27932742007-05-08 00:26:17 -07001725 if (info)
1726 snprintf(info, PROC_FDINFO_MAX,
1727 "pos:\t%lli\n"
1728 "flags:\t0%o\n",
1729 (long long) file->f_pos,
1730 file->f_flags);
Eric W. Biederman28a6d672006-10-02 02:17:05 -07001731 spin_unlock(&files->file_lock);
1732 put_files_struct(files);
1733 return 0;
1734 }
1735 spin_unlock(&files->file_lock);
1736 put_files_struct(files);
1737 }
1738 return -ENOENT;
1739}
1740
Jan Blunck3dcd25f2008-02-14 19:38:35 -08001741static int proc_fd_link(struct inode *inode, struct path *path)
Miklos Szeredi27932742007-05-08 00:26:17 -07001742{
Jan Blunck3dcd25f2008-02-14 19:38:35 -08001743 return proc_fd_info(inode, path, NULL);
Miklos Szeredi27932742007-05-08 00:26:17 -07001744}
1745
Eric W. Biederman28a6d672006-10-02 02:17:05 -07001746static int tid_fd_revalidate(struct dentry *dentry, struct nameidata *nd)
1747{
1748 struct inode *inode = dentry->d_inode;
1749 struct task_struct *task = get_proc_task(inode);
1750 int fd = proc_fd(inode);
1751 struct files_struct *files;
David Howellsc69e8d92008-11-14 10:39:19 +11001752 const struct cred *cred;
Eric W. Biederman28a6d672006-10-02 02:17:05 -07001753
1754 if (task) {
1755 files = get_files_struct(task);
1756 if (files) {
1757 rcu_read_lock();
1758 if (fcheck_files(files, fd)) {
1759 rcu_read_unlock();
1760 put_files_struct(files);
1761 if (task_dumpable(task)) {
David Howellsc69e8d92008-11-14 10:39:19 +11001762 rcu_read_lock();
1763 cred = __task_cred(task);
1764 inode->i_uid = cred->euid;
1765 inode->i_gid = cred->egid;
1766 rcu_read_unlock();
Eric W. Biederman28a6d672006-10-02 02:17:05 -07001767 } else {
1768 inode->i_uid = 0;
1769 inode->i_gid = 0;
1770 }
1771 inode->i_mode &= ~(S_ISUID | S_ISGID);
1772 security_task_to_inode(task, inode);
1773 put_task_struct(task);
1774 return 1;
1775 }
1776 rcu_read_unlock();
1777 put_files_struct(files);
1778 }
1779 put_task_struct(task);
1780 }
1781 d_drop(dentry);
1782 return 0;
1783}
1784
Al Virod72f71e2009-02-20 05:58:47 +00001785static const struct dentry_operations tid_fd_dentry_operations =
Eric W. Biederman28a6d672006-10-02 02:17:05 -07001786{
1787 .d_revalidate = tid_fd_revalidate,
1788 .d_delete = pid_delete_dentry,
1789};
1790
Eric W. Biederman444ceed2006-10-02 02:18:49 -07001791static struct dentry *proc_fd_instantiate(struct inode *dir,
Eric Dumazetc5141e62007-05-08 00:26:15 -07001792 struct dentry *dentry, struct task_struct *task, const void *ptr)
Eric W. Biederman28a6d672006-10-02 02:17:05 -07001793{
Eric Dumazetc5141e62007-05-08 00:26:15 -07001794 unsigned fd = *(const unsigned *)ptr;
Eric W. Biederman444ceed2006-10-02 02:18:49 -07001795 struct file *file;
1796 struct files_struct *files;
1797 struct inode *inode;
1798 struct proc_inode *ei;
1799 struct dentry *error = ERR_PTR(-ENOENT);
Eric W. Biederman28a6d672006-10-02 02:17:05 -07001800
Eric W. Biederman61a28782006-10-02 02:18:49 -07001801 inode = proc_pid_make_inode(dir->i_sb, task);
Eric W. Biederman28a6d672006-10-02 02:17:05 -07001802 if (!inode)
1803 goto out;
1804 ei = PROC_I(inode);
1805 ei->fd = fd;
1806 files = get_files_struct(task);
1807 if (!files)
Eric W. Biederman444ceed2006-10-02 02:18:49 -07001808 goto out_iput;
Eric W. Biederman28a6d672006-10-02 02:17:05 -07001809 inode->i_mode = S_IFLNK;
1810
1811 /*
1812 * We are not taking a ref to the file structure, so we must
1813 * hold ->file_lock.
1814 */
1815 spin_lock(&files->file_lock);
1816 file = fcheck_files(files, fd);
1817 if (!file)
Eric W. Biederman444ceed2006-10-02 02:18:49 -07001818 goto out_unlock;
Al Viroaeb5d722008-09-02 15:28:45 -04001819 if (file->f_mode & FMODE_READ)
Eric W. Biederman28a6d672006-10-02 02:17:05 -07001820 inode->i_mode |= S_IRUSR | S_IXUSR;
Al Viroaeb5d722008-09-02 15:28:45 -04001821 if (file->f_mode & FMODE_WRITE)
Eric W. Biederman28a6d672006-10-02 02:17:05 -07001822 inode->i_mode |= S_IWUSR | S_IXUSR;
1823 spin_unlock(&files->file_lock);
1824 put_files_struct(files);
Eric W. Biederman444ceed2006-10-02 02:18:49 -07001825
Eric W. Biederman28a6d672006-10-02 02:17:05 -07001826 inode->i_op = &proc_pid_link_inode_operations;
1827 inode->i_size = 64;
1828 ei->op.proc_get_link = proc_fd_link;
1829 dentry->d_op = &tid_fd_dentry_operations;
1830 d_add(dentry, inode);
1831 /* Close the race of the process dying before we return the dentry */
1832 if (tid_fd_revalidate(dentry, NULL))
Eric W. Biederman444ceed2006-10-02 02:18:49 -07001833 error = NULL;
1834
1835 out:
1836 return error;
1837out_unlock:
1838 spin_unlock(&files->file_lock);
1839 put_files_struct(files);
1840out_iput:
1841 iput(inode);
1842 goto out;
1843}
1844
Miklos Szeredi27932742007-05-08 00:26:17 -07001845static struct dentry *proc_lookupfd_common(struct inode *dir,
1846 struct dentry *dentry,
1847 instantiate_t instantiate)
Eric W. Biederman444ceed2006-10-02 02:18:49 -07001848{
1849 struct task_struct *task = get_proc_task(dir);
1850 unsigned fd = name_to_int(dentry);
1851 struct dentry *result = ERR_PTR(-ENOENT);
1852
1853 if (!task)
1854 goto out_no_task;
1855 if (fd == ~0U)
1856 goto out;
1857
Miklos Szeredi27932742007-05-08 00:26:17 -07001858 result = instantiate(dir, dentry, task, &fd);
Eric W. Biederman28a6d672006-10-02 02:17:05 -07001859out:
1860 put_task_struct(task);
1861out_no_task:
1862 return result;
Eric W. Biederman28a6d672006-10-02 02:17:05 -07001863}
1864
Miklos Szeredi27932742007-05-08 00:26:17 -07001865static int proc_readfd_common(struct file * filp, void * dirent,
1866 filldir_t filldir, instantiate_t instantiate)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001867{
Josef "Jeff" Sipek2fddfee2006-12-08 02:36:36 -08001868 struct dentry *dentry = filp->f_path.dentry;
Eric W. Biederman56347082006-06-26 00:25:40 -07001869 struct inode *inode = dentry->d_inode;
Eric W. Biederman99f89552006-06-26 00:25:55 -07001870 struct task_struct *p = get_proc_task(inode);
Pavel Emelyanov457c2512007-10-18 23:40:43 -07001871 unsigned int fd, ino;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001872 int retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001873 struct files_struct * files;
1874
1875 retval = -ENOENT;
Eric W. Biederman99f89552006-06-26 00:25:55 -07001876 if (!p)
1877 goto out_no_task;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001878 retval = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001879
1880 fd = filp->f_pos;
1881 switch (fd) {
1882 case 0:
1883 if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0)
1884 goto out;
1885 filp->f_pos++;
1886 case 1:
Eric W. Biederman56347082006-06-26 00:25:40 -07001887 ino = parent_ino(dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001888 if (filldir(dirent, "..", 2, 1, ino, DT_DIR) < 0)
1889 goto out;
1890 filp->f_pos++;
1891 default:
1892 files = get_files_struct(p);
1893 if (!files)
1894 goto out;
Dipankar Sarmab8359962005-09-09 13:04:14 -07001895 rcu_read_lock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001896 for (fd = filp->f_pos-2;
Al Viro9b4f5262008-04-22 01:32:44 -04001897 fd < files_fdtable(files)->max_fds;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001898 fd++, filp->f_pos++) {
Miklos Szeredi27932742007-05-08 00:26:17 -07001899 char name[PROC_NUMBUF];
1900 int len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001901
1902 if (!fcheck_files(files, fd))
1903 continue;
Dipankar Sarmab8359962005-09-09 13:04:14 -07001904 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001905
Miklos Szeredi27932742007-05-08 00:26:17 -07001906 len = snprintf(name, sizeof(name), "%d", fd);
1907 if (proc_fill_cache(filp, dirent, filldir,
1908 name, len, instantiate,
1909 p, &fd) < 0) {
Dipankar Sarmab8359962005-09-09 13:04:14 -07001910 rcu_read_lock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001911 break;
1912 }
Dipankar Sarmab8359962005-09-09 13:04:14 -07001913 rcu_read_lock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001914 }
Dipankar Sarmab8359962005-09-09 13:04:14 -07001915 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001916 put_files_struct(files);
1917 }
1918out:
Eric W. Biederman99f89552006-06-26 00:25:55 -07001919 put_task_struct(p);
1920out_no_task:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001921 return retval;
1922}
1923
Miklos Szeredi27932742007-05-08 00:26:17 -07001924static struct dentry *proc_lookupfd(struct inode *dir, struct dentry *dentry,
1925 struct nameidata *nd)
1926{
1927 return proc_lookupfd_common(dir, dentry, proc_fd_instantiate);
1928}
1929
1930static int proc_readfd(struct file *filp, void *dirent, filldir_t filldir)
1931{
1932 return proc_readfd_common(filp, dirent, filldir, proc_fd_instantiate);
1933}
1934
1935static ssize_t proc_fdinfo_read(struct file *file, char __user *buf,
1936 size_t len, loff_t *ppos)
1937{
1938 char tmp[PROC_FDINFO_MAX];
Jan Blunck3dcd25f2008-02-14 19:38:35 -08001939 int err = proc_fd_info(file->f_path.dentry->d_inode, NULL, tmp);
Miklos Szeredi27932742007-05-08 00:26:17 -07001940 if (!err)
1941 err = simple_read_from_buffer(buf, len, ppos, tmp, strlen(tmp));
1942 return err;
1943}
1944
1945static const struct file_operations proc_fdinfo_file_operations = {
1946 .open = nonseekable_open,
1947 .read = proc_fdinfo_read,
1948};
1949
Arjan van de Ven00977a52007-02-12 00:55:34 -08001950static const struct file_operations proc_fd_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001951 .read = generic_read_dir,
1952 .readdir = proc_readfd,
1953};
1954
Linus Torvalds1da177e2005-04-16 15:20:36 -07001955/*
Alexey Dobriyan8948e112007-05-08 00:23:35 -07001956 * /proc/pid/fd needs a special permission handler so that a process can still
1957 * access /proc/self/fd after it has executed a setuid().
1958 */
Al Viroe6305c42008-07-15 21:03:57 -04001959static int proc_fd_permission(struct inode *inode, int mask)
Alexey Dobriyan8948e112007-05-08 00:23:35 -07001960{
1961 int rv;
1962
1963 rv = generic_permission(inode, mask, NULL);
1964 if (rv == 0)
1965 return 0;
1966 if (task_pid(current) == proc_pid(inode))
1967 rv = 0;
1968 return rv;
1969}
1970
1971/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001972 * proc directories can do almost nothing..
1973 */
Arjan van de Venc5ef1c42007-02-12 00:55:40 -08001974static const struct inode_operations proc_fd_inode_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001975 .lookup = proc_lookupfd,
Alexey Dobriyan8948e112007-05-08 00:23:35 -07001976 .permission = proc_fd_permission,
Linus Torvalds6d76fa52006-07-15 12:26:45 -07001977 .setattr = proc_setattr,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001978};
1979
Miklos Szeredi27932742007-05-08 00:26:17 -07001980static struct dentry *proc_fdinfo_instantiate(struct inode *dir,
1981 struct dentry *dentry, struct task_struct *task, const void *ptr)
1982{
1983 unsigned fd = *(unsigned *)ptr;
1984 struct inode *inode;
1985 struct proc_inode *ei;
1986 struct dentry *error = ERR_PTR(-ENOENT);
1987
1988 inode = proc_pid_make_inode(dir->i_sb, task);
1989 if (!inode)
1990 goto out;
1991 ei = PROC_I(inode);
1992 ei->fd = fd;
1993 inode->i_mode = S_IFREG | S_IRUSR;
1994 inode->i_fop = &proc_fdinfo_file_operations;
1995 dentry->d_op = &tid_fd_dentry_operations;
1996 d_add(dentry, inode);
1997 /* Close the race of the process dying before we return the dentry */
1998 if (tid_fd_revalidate(dentry, NULL))
1999 error = NULL;
2000
2001 out:
2002 return error;
2003}
2004
2005static struct dentry *proc_lookupfdinfo(struct inode *dir,
2006 struct dentry *dentry,
2007 struct nameidata *nd)
2008{
2009 return proc_lookupfd_common(dir, dentry, proc_fdinfo_instantiate);
2010}
2011
2012static int proc_readfdinfo(struct file *filp, void *dirent, filldir_t filldir)
2013{
2014 return proc_readfd_common(filp, dirent, filldir,
2015 proc_fdinfo_instantiate);
2016}
2017
2018static const struct file_operations proc_fdinfo_operations = {
2019 .read = generic_read_dir,
2020 .readdir = proc_readfdinfo,
2021};
2022
2023/*
2024 * proc directories can do almost nothing..
2025 */
2026static const struct inode_operations proc_fdinfo_inode_operations = {
2027 .lookup = proc_lookupfdinfo,
2028 .setattr = proc_setattr,
2029};
2030
2031
Eric W. Biederman444ceed2006-10-02 02:18:49 -07002032static struct dentry *proc_pident_instantiate(struct inode *dir,
Eric Dumazetc5141e62007-05-08 00:26:15 -07002033 struct dentry *dentry, struct task_struct *task, const void *ptr)
Eric W. Biederman444ceed2006-10-02 02:18:49 -07002034{
Eric Dumazetc5141e62007-05-08 00:26:15 -07002035 const struct pid_entry *p = ptr;
Eric W. Biederman444ceed2006-10-02 02:18:49 -07002036 struct inode *inode;
2037 struct proc_inode *ei;
KOSAKI Motohirobd6daba2009-05-28 14:34:21 -07002038 struct dentry *error = ERR_PTR(-ENOENT);
Eric W. Biederman444ceed2006-10-02 02:18:49 -07002039
Eric W. Biederman61a28782006-10-02 02:18:49 -07002040 inode = proc_pid_make_inode(dir->i_sb, task);
Eric W. Biederman444ceed2006-10-02 02:18:49 -07002041 if (!inode)
2042 goto out;
2043
2044 ei = PROC_I(inode);
2045 inode->i_mode = p->mode;
2046 if (S_ISDIR(inode->i_mode))
2047 inode->i_nlink = 2; /* Use getattr to fix if necessary */
2048 if (p->iop)
2049 inode->i_op = p->iop;
2050 if (p->fop)
2051 inode->i_fop = p->fop;
2052 ei->op = p->op;
2053 dentry->d_op = &pid_dentry_operations;
2054 d_add(dentry, inode);
2055 /* Close the race of the process dying before we return the dentry */
2056 if (pid_revalidate(dentry, NULL))
2057 error = NULL;
2058out:
2059 return error;
2060}
2061
Linus Torvalds1da177e2005-04-16 15:20:36 -07002062static struct dentry *proc_pident_lookup(struct inode *dir,
2063 struct dentry *dentry,
Eric Dumazetc5141e62007-05-08 00:26:15 -07002064 const struct pid_entry *ents,
Eric W. Biederman7bcd6b02006-10-02 02:18:56 -07002065 unsigned int nents)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002066{
Eric W. Biedermancd6a3ce2006-06-26 00:25:49 -07002067 struct dentry *error;
Eric W. Biederman99f89552006-06-26 00:25:55 -07002068 struct task_struct *task = get_proc_task(dir);
Eric Dumazetc5141e62007-05-08 00:26:15 -07002069 const struct pid_entry *p, *last;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002070
Eric W. Biedermancd6a3ce2006-06-26 00:25:49 -07002071 error = ERR_PTR(-ENOENT);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002072
Eric W. Biederman99f89552006-06-26 00:25:55 -07002073 if (!task)
2074 goto out_no_task;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002075
Eric W. Biederman20cdc892006-10-02 02:17:07 -07002076 /*
2077 * Yes, it does not scale. And it should not. Don't add
2078 * new entries into /proc/<tgid>/ without very good reasons.
2079 */
Eric W. Biederman7bcd6b02006-10-02 02:18:56 -07002080 last = &ents[nents - 1];
2081 for (p = ents; p <= last; p++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002082 if (p->len != dentry->d_name.len)
2083 continue;
2084 if (!memcmp(dentry->d_name.name, p->name, p->len))
2085 break;
2086 }
Eric W. Biederman7bcd6b02006-10-02 02:18:56 -07002087 if (p > last)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002088 goto out;
2089
Eric W. Biederman444ceed2006-10-02 02:18:49 -07002090 error = proc_pident_instantiate(dir, dentry, task, p);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002091out:
Eric W. Biederman99f89552006-06-26 00:25:55 -07002092 put_task_struct(task);
2093out_no_task:
Eric W. Biedermancd6a3ce2006-06-26 00:25:49 -07002094 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002095}
2096
Eric Dumazetc5141e62007-05-08 00:26:15 -07002097static int proc_pident_fill_cache(struct file *filp, void *dirent,
2098 filldir_t filldir, struct task_struct *task, const struct pid_entry *p)
Eric W. Biederman61a28782006-10-02 02:18:49 -07002099{
2100 return proc_fill_cache(filp, dirent, filldir, p->name, p->len,
2101 proc_pident_instantiate, task, p);
2102}
2103
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002104static int proc_pident_readdir(struct file *filp,
2105 void *dirent, filldir_t filldir,
Eric Dumazetc5141e62007-05-08 00:26:15 -07002106 const struct pid_entry *ents, unsigned int nents)
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002107{
2108 int i;
Josef "Jeff" Sipek2fddfee2006-12-08 02:36:36 -08002109 struct dentry *dentry = filp->f_path.dentry;
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002110 struct inode *inode = dentry->d_inode;
2111 struct task_struct *task = get_proc_task(inode);
Eric Dumazetc5141e62007-05-08 00:26:15 -07002112 const struct pid_entry *p, *last;
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002113 ino_t ino;
2114 int ret;
2115
2116 ret = -ENOENT;
2117 if (!task)
Eric W. Biederman61a28782006-10-02 02:18:49 -07002118 goto out_no_task;
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002119
2120 ret = 0;
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002121 i = filp->f_pos;
2122 switch (i) {
2123 case 0:
2124 ino = inode->i_ino;
2125 if (filldir(dirent, ".", 1, i, ino, DT_DIR) < 0)
2126 goto out;
2127 i++;
2128 filp->f_pos++;
2129 /* fall through */
2130 case 1:
2131 ino = parent_ino(dentry);
2132 if (filldir(dirent, "..", 2, i, ino, DT_DIR) < 0)
2133 goto out;
2134 i++;
2135 filp->f_pos++;
2136 /* fall through */
2137 default:
2138 i -= 2;
2139 if (i >= nents) {
2140 ret = 1;
2141 goto out;
2142 }
2143 p = ents + i;
Eric W. Biederman7bcd6b02006-10-02 02:18:56 -07002144 last = &ents[nents - 1];
2145 while (p <= last) {
Eric W. Biederman61a28782006-10-02 02:18:49 -07002146 if (proc_pident_fill_cache(filp, dirent, filldir, task, p) < 0)
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002147 goto out;
2148 filp->f_pos++;
2149 p++;
2150 }
2151 }
2152
2153 ret = 1;
2154out:
Eric W. Biederman61a28782006-10-02 02:18:49 -07002155 put_task_struct(task);
2156out_no_task:
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002157 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002158}
2159
Linus Torvalds1da177e2005-04-16 15:20:36 -07002160#ifdef CONFIG_SECURITY
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002161static ssize_t proc_pid_attr_read(struct file * file, char __user * buf,
2162 size_t count, loff_t *ppos)
2163{
Josef "Jeff" Sipek2fddfee2006-12-08 02:36:36 -08002164 struct inode * inode = file->f_path.dentry->d_inode;
Al Viro04ff9702007-03-12 16:17:58 +00002165 char *p = NULL;
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002166 ssize_t length;
2167 struct task_struct *task = get_proc_task(inode);
2168
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002169 if (!task)
Al Viro04ff9702007-03-12 16:17:58 +00002170 return -ESRCH;
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002171
2172 length = security_getprocattr(task,
Josef "Jeff" Sipek2fddfee2006-12-08 02:36:36 -08002173 (char*)file->f_path.dentry->d_name.name,
Al Viro04ff9702007-03-12 16:17:58 +00002174 &p);
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002175 put_task_struct(task);
Al Viro04ff9702007-03-12 16:17:58 +00002176 if (length > 0)
2177 length = simple_read_from_buffer(buf, count, ppos, p, length);
2178 kfree(p);
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002179 return length;
2180}
2181
2182static ssize_t proc_pid_attr_write(struct file * file, const char __user * buf,
2183 size_t count, loff_t *ppos)
2184{
Josef "Jeff" Sipek2fddfee2006-12-08 02:36:36 -08002185 struct inode * inode = file->f_path.dentry->d_inode;
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002186 char *page;
2187 ssize_t length;
2188 struct task_struct *task = get_proc_task(inode);
2189
2190 length = -ESRCH;
2191 if (!task)
2192 goto out_no_task;
2193 if (count > PAGE_SIZE)
2194 count = PAGE_SIZE;
2195
2196 /* No partial writes. */
2197 length = -EINVAL;
2198 if (*ppos != 0)
2199 goto out;
2200
2201 length = -ENOMEM;
Mel Gormane12ba742007-10-16 01:25:52 -07002202 page = (char*)__get_free_page(GFP_TEMPORARY);
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002203 if (!page)
2204 goto out;
2205
2206 length = -EFAULT;
2207 if (copy_from_user(page, buf, count))
2208 goto out_free;
2209
David Howells107db7c2009-05-08 13:55:27 +01002210 /* Guard against adverse ptrace interaction */
2211 length = mutex_lock_interruptible(&task->cred_guard_mutex);
2212 if (length < 0)
2213 goto out_free;
2214
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002215 length = security_setprocattr(task,
Josef "Jeff" Sipek2fddfee2006-12-08 02:36:36 -08002216 (char*)file->f_path.dentry->d_name.name,
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002217 (void*)page, count);
David Howells107db7c2009-05-08 13:55:27 +01002218 mutex_unlock(&task->cred_guard_mutex);
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002219out_free:
2220 free_page((unsigned long) page);
2221out:
2222 put_task_struct(task);
2223out_no_task:
2224 return length;
2225}
2226
Arjan van de Ven00977a52007-02-12 00:55:34 -08002227static const struct file_operations proc_pid_attr_operations = {
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002228 .read = proc_pid_attr_read,
2229 .write = proc_pid_attr_write,
2230};
2231
Eric Dumazetc5141e62007-05-08 00:26:15 -07002232static const struct pid_entry attr_dir_stuff[] = {
Alexey Dobriyan631f9c12008-11-10 01:32:52 +03002233 REG("current", S_IRUGO|S_IWUGO, proc_pid_attr_operations),
2234 REG("prev", S_IRUGO, proc_pid_attr_operations),
2235 REG("exec", S_IRUGO|S_IWUGO, proc_pid_attr_operations),
2236 REG("fscreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations),
2237 REG("keycreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations),
2238 REG("sockcreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations),
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002239};
2240
Eric W. Biederman72d9dcf2006-10-02 02:18:50 -07002241static int proc_attr_dir_readdir(struct file * filp,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002242 void * dirent, filldir_t filldir)
2243{
2244 return proc_pident_readdir(filp,dirent,filldir,
Eric W. Biederman72d9dcf2006-10-02 02:18:50 -07002245 attr_dir_stuff,ARRAY_SIZE(attr_dir_stuff));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002246}
2247
Arjan van de Ven00977a52007-02-12 00:55:34 -08002248static const struct file_operations proc_attr_dir_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002249 .read = generic_read_dir,
Eric W. Biederman72d9dcf2006-10-02 02:18:50 -07002250 .readdir = proc_attr_dir_readdir,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002251};
2252
Eric W. Biederman72d9dcf2006-10-02 02:18:50 -07002253static struct dentry *proc_attr_dir_lookup(struct inode *dir,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002254 struct dentry *dentry, struct nameidata *nd)
2255{
Eric W. Biederman7bcd6b02006-10-02 02:18:56 -07002256 return proc_pident_lookup(dir, dentry,
2257 attr_dir_stuff, ARRAY_SIZE(attr_dir_stuff));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002258}
2259
Arjan van de Venc5ef1c42007-02-12 00:55:40 -08002260static const struct inode_operations proc_attr_dir_inode_operations = {
Eric W. Biederman72d9dcf2006-10-02 02:18:50 -07002261 .lookup = proc_attr_dir_lookup,
Eric W. Biederman99f89552006-06-26 00:25:55 -07002262 .getattr = pid_getattr,
Linus Torvalds6d76fa52006-07-15 12:26:45 -07002263 .setattr = proc_setattr,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002264};
2265
Linus Torvalds1da177e2005-04-16 15:20:36 -07002266#endif
2267
Christoph Hellwig698ba7b2009-12-15 16:47:37 -08002268#ifdef CONFIG_ELF_CORE
Kawai, Hidehiro3cb4a0b2007-07-19 01:48:28 -07002269static ssize_t proc_coredump_filter_read(struct file *file, char __user *buf,
2270 size_t count, loff_t *ppos)
2271{
2272 struct task_struct *task = get_proc_task(file->f_dentry->d_inode);
2273 struct mm_struct *mm;
2274 char buffer[PROC_NUMBUF];
2275 size_t len;
2276 int ret;
2277
2278 if (!task)
2279 return -ESRCH;
2280
2281 ret = 0;
2282 mm = get_task_mm(task);
2283 if (mm) {
2284 len = snprintf(buffer, sizeof(buffer), "%08lx\n",
2285 ((mm->flags & MMF_DUMP_FILTER_MASK) >>
2286 MMF_DUMP_FILTER_SHIFT));
2287 mmput(mm);
2288 ret = simple_read_from_buffer(buf, count, ppos, buffer, len);
2289 }
2290
2291 put_task_struct(task);
2292
2293 return ret;
2294}
2295
2296static ssize_t proc_coredump_filter_write(struct file *file,
2297 const char __user *buf,
2298 size_t count,
2299 loff_t *ppos)
2300{
2301 struct task_struct *task;
2302 struct mm_struct *mm;
2303 char buffer[PROC_NUMBUF], *end;
2304 unsigned int val;
2305 int ret;
2306 int i;
2307 unsigned long mask;
2308
2309 ret = -EFAULT;
2310 memset(buffer, 0, sizeof(buffer));
2311 if (count > sizeof(buffer) - 1)
2312 count = sizeof(buffer) - 1;
2313 if (copy_from_user(buffer, buf, count))
2314 goto out_no_task;
2315
2316 ret = -EINVAL;
2317 val = (unsigned int)simple_strtoul(buffer, &end, 0);
2318 if (*end == '\n')
2319 end++;
2320 if (end - buffer == 0)
2321 goto out_no_task;
2322
2323 ret = -ESRCH;
2324 task = get_proc_task(file->f_dentry->d_inode);
2325 if (!task)
2326 goto out_no_task;
2327
2328 ret = end - buffer;
2329 mm = get_task_mm(task);
2330 if (!mm)
2331 goto out_no_mm;
2332
2333 for (i = 0, mask = 1; i < MMF_DUMP_FILTER_BITS; i++, mask <<= 1) {
2334 if (val & mask)
2335 set_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags);
2336 else
2337 clear_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags);
2338 }
2339
2340 mmput(mm);
2341 out_no_mm:
2342 put_task_struct(task);
2343 out_no_task:
2344 return ret;
2345}
2346
2347static const struct file_operations proc_coredump_filter_operations = {
2348 .read = proc_coredump_filter_read,
2349 .write = proc_coredump_filter_write,
2350};
2351#endif
2352
Linus Torvalds1da177e2005-04-16 15:20:36 -07002353/*
2354 * /proc/self:
2355 */
2356static int proc_self_readlink(struct dentry *dentry, char __user *buffer,
2357 int buflen)
2358{
Eric W. Biederman488e5bc2008-02-08 04:18:34 -08002359 struct pid_namespace *ns = dentry->d_sb->s_fs_info;
Andrew Mortonb55fcb22008-02-08 15:00:43 -08002360 pid_t tgid = task_tgid_nr_ns(current, ns);
Eric W. Biederman8578cea2006-06-26 00:25:54 -07002361 char tmp[PROC_NUMBUF];
Andrew Mortonb55fcb22008-02-08 15:00:43 -08002362 if (!tgid)
Eric W. Biederman488e5bc2008-02-08 04:18:34 -08002363 return -ENOENT;
Andrew Mortonb55fcb22008-02-08 15:00:43 -08002364 sprintf(tmp, "%d", tgid);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002365 return vfs_readlink(dentry,buffer,buflen,tmp);
2366}
2367
Al Viro008b1502005-08-20 00:17:39 +01002368static void *proc_self_follow_link(struct dentry *dentry, struct nameidata *nd)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002369{
Eric W. Biederman488e5bc2008-02-08 04:18:34 -08002370 struct pid_namespace *ns = dentry->d_sb->s_fs_info;
Andrew Mortonb55fcb22008-02-08 15:00:43 -08002371 pid_t tgid = task_tgid_nr_ns(current, ns);
Al Viro7fee4862010-01-14 01:03:28 -05002372 char *name = ERR_PTR(-ENOENT);
2373 if (tgid) {
2374 name = __getname();
2375 if (!name)
2376 name = ERR_PTR(-ENOMEM);
2377 else
2378 sprintf(name, "%d", tgid);
2379 }
2380 nd_set_link(nd, name);
2381 return NULL;
2382}
2383
2384static void proc_self_put_link(struct dentry *dentry, struct nameidata *nd,
2385 void *cookie)
2386{
2387 char *s = nd_get_link(nd);
2388 if (!IS_ERR(s))
2389 __putname(s);
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002390}
Linus Torvalds1da177e2005-04-16 15:20:36 -07002391
Arjan van de Venc5ef1c42007-02-12 00:55:40 -08002392static const struct inode_operations proc_self_inode_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002393 .readlink = proc_self_readlink,
2394 .follow_link = proc_self_follow_link,
Al Viro7fee4862010-01-14 01:03:28 -05002395 .put_link = proc_self_put_link,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002396};
2397
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002398/*
Eric W. Biederman801199c2006-10-02 02:18:48 -07002399 * proc base
2400 *
2401 * These are the directory entries in the root directory of /proc
2402 * that properly belong to the /proc filesystem, as they describe
2403 * describe something that is process related.
2404 */
Eric Dumazetc5141e62007-05-08 00:26:15 -07002405static const struct pid_entry proc_base_stuff[] = {
Eric W. Biederman61a28782006-10-02 02:18:49 -07002406 NOD("self", S_IFLNK|S_IRWXUGO,
Eric W. Biederman801199c2006-10-02 02:18:48 -07002407 &proc_self_inode_operations, NULL, {}),
Eric W. Biederman801199c2006-10-02 02:18:48 -07002408};
2409
2410/*
2411 * Exceptional case: normally we are not allowed to unhash a busy
2412 * directory. In this case, however, we can do it - no aliasing problems
2413 * due to the way we treat inodes.
2414 */
2415static int proc_base_revalidate(struct dentry *dentry, struct nameidata *nd)
2416{
2417 struct inode *inode = dentry->d_inode;
2418 struct task_struct *task = get_proc_task(inode);
2419 if (task) {
2420 put_task_struct(task);
2421 return 1;
2422 }
2423 d_drop(dentry);
2424 return 0;
2425}
2426
Al Virod72f71e2009-02-20 05:58:47 +00002427static const struct dentry_operations proc_base_dentry_operations =
Eric W. Biederman801199c2006-10-02 02:18:48 -07002428{
2429 .d_revalidate = proc_base_revalidate,
2430 .d_delete = pid_delete_dentry,
2431};
2432
Eric W. Biederman444ceed2006-10-02 02:18:49 -07002433static struct dentry *proc_base_instantiate(struct inode *dir,
Eric Dumazetc5141e62007-05-08 00:26:15 -07002434 struct dentry *dentry, struct task_struct *task, const void *ptr)
Eric W. Biederman801199c2006-10-02 02:18:48 -07002435{
Eric Dumazetc5141e62007-05-08 00:26:15 -07002436 const struct pid_entry *p = ptr;
Eric W. Biederman801199c2006-10-02 02:18:48 -07002437 struct inode *inode;
Eric W. Biederman801199c2006-10-02 02:18:48 -07002438 struct proc_inode *ei;
Eric W. Biederman444ceed2006-10-02 02:18:49 -07002439 struct dentry *error = ERR_PTR(-EINVAL);
Eric W. Biederman801199c2006-10-02 02:18:48 -07002440
2441 /* Allocate the inode */
2442 error = ERR_PTR(-ENOMEM);
2443 inode = new_inode(dir->i_sb);
2444 if (!inode)
2445 goto out;
2446
2447 /* Initialize the inode */
2448 ei = PROC_I(inode);
2449 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
Eric W. Biederman801199c2006-10-02 02:18:48 -07002450
2451 /*
2452 * grab the reference to the task.
2453 */
Oleg Nesterov1a657f782006-10-02 02:18:59 -07002454 ei->pid = get_task_pid(task, PIDTYPE_PID);
Eric W. Biederman801199c2006-10-02 02:18:48 -07002455 if (!ei->pid)
2456 goto out_iput;
2457
Eric W. Biederman801199c2006-10-02 02:18:48 -07002458 inode->i_mode = p->mode;
2459 if (S_ISDIR(inode->i_mode))
2460 inode->i_nlink = 2;
2461 if (S_ISLNK(inode->i_mode))
2462 inode->i_size = 64;
2463 if (p->iop)
2464 inode->i_op = p->iop;
2465 if (p->fop)
2466 inode->i_fop = p->fop;
2467 ei->op = p->op;
2468 dentry->d_op = &proc_base_dentry_operations;
2469 d_add(dentry, inode);
2470 error = NULL;
2471out:
Eric W. Biederman801199c2006-10-02 02:18:48 -07002472 return error;
2473out_iput:
2474 iput(inode);
2475 goto out;
2476}
2477
Eric W. Biederman444ceed2006-10-02 02:18:49 -07002478static struct dentry *proc_base_lookup(struct inode *dir, struct dentry *dentry)
2479{
2480 struct dentry *error;
2481 struct task_struct *task = get_proc_task(dir);
Eric Dumazetc5141e62007-05-08 00:26:15 -07002482 const struct pid_entry *p, *last;
Eric W. Biederman444ceed2006-10-02 02:18:49 -07002483
2484 error = ERR_PTR(-ENOENT);
2485
2486 if (!task)
2487 goto out_no_task;
2488
2489 /* Lookup the directory entry */
Eric W. Biederman7bcd6b02006-10-02 02:18:56 -07002490 last = &proc_base_stuff[ARRAY_SIZE(proc_base_stuff) - 1];
2491 for (p = proc_base_stuff; p <= last; p++) {
Eric W. Biederman444ceed2006-10-02 02:18:49 -07002492 if (p->len != dentry->d_name.len)
2493 continue;
2494 if (!memcmp(dentry->d_name.name, p->name, p->len))
2495 break;
2496 }
Eric W. Biederman7bcd6b02006-10-02 02:18:56 -07002497 if (p > last)
Eric W. Biederman444ceed2006-10-02 02:18:49 -07002498 goto out;
2499
2500 error = proc_base_instantiate(dir, dentry, task, p);
2501
2502out:
2503 put_task_struct(task);
2504out_no_task:
2505 return error;
2506}
2507
Eric Dumazetc5141e62007-05-08 00:26:15 -07002508static int proc_base_fill_cache(struct file *filp, void *dirent,
2509 filldir_t filldir, struct task_struct *task, const struct pid_entry *p)
Eric W. Biederman61a28782006-10-02 02:18:49 -07002510{
2511 return proc_fill_cache(filp, dirent, filldir, p->name, p->len,
2512 proc_base_instantiate, task, p);
2513}
2514
Andrew Mortonaba76fd2006-12-10 02:19:48 -08002515#ifdef CONFIG_TASK_IO_ACCOUNTING
Andrea Righi297c5d92008-07-25 01:48:49 -07002516static int do_io_accounting(struct task_struct *task, char *buffer, int whole)
Andrew Mortonaba76fd2006-12-10 02:19:48 -08002517{
Andrea Righi940389b2008-07-28 00:48:12 +02002518 struct task_io_accounting acct = task->ioac;
Andrea Righi59954772008-07-27 17:29:15 +02002519 unsigned long flags;
Andrea Righi297c5d92008-07-25 01:48:49 -07002520
Andrea Righi59954772008-07-27 17:29:15 +02002521 if (whole && lock_task_sighand(task, &flags)) {
2522 struct task_struct *t = task;
Andrea Righib2d002d2008-07-26 15:22:27 -07002523
Andrea Righi59954772008-07-27 17:29:15 +02002524 task_io_accounting_add(&acct, &task->signal->ioac);
2525 while_each_thread(task, t)
2526 task_io_accounting_add(&acct, &t->ioac);
Andrea Righi297c5d92008-07-25 01:48:49 -07002527
Andrea Righi59954772008-07-27 17:29:15 +02002528 unlock_task_sighand(task, &flags);
Andrea Righi297c5d92008-07-25 01:48:49 -07002529 }
Andrew Mortonaba76fd2006-12-10 02:19:48 -08002530 return sprintf(buffer,
2531 "rchar: %llu\n"
2532 "wchar: %llu\n"
2533 "syscr: %llu\n"
2534 "syscw: %llu\n"
2535 "read_bytes: %llu\n"
2536 "write_bytes: %llu\n"
2537 "cancelled_write_bytes: %llu\n",
Alexander Beregalov7c443192008-08-05 13:01:34 -07002538 (unsigned long long)acct.rchar,
2539 (unsigned long long)acct.wchar,
2540 (unsigned long long)acct.syscr,
2541 (unsigned long long)acct.syscw,
2542 (unsigned long long)acct.read_bytes,
2543 (unsigned long long)acct.write_bytes,
2544 (unsigned long long)acct.cancelled_write_bytes);
Andrew Mortonaba76fd2006-12-10 02:19:48 -08002545}
Andrea Righi297c5d92008-07-25 01:48:49 -07002546
2547static int proc_tid_io_accounting(struct task_struct *task, char *buffer)
2548{
2549 return do_io_accounting(task, buffer, 0);
2550}
2551
2552static int proc_tgid_io_accounting(struct task_struct *task, char *buffer)
2553{
2554 return do_io_accounting(task, buffer, 1);
2555}
2556#endif /* CONFIG_TASK_IO_ACCOUNTING */
Andrew Mortonaba76fd2006-12-10 02:19:48 -08002557
Kees Cook47830722008-10-06 03:11:58 +04002558static int proc_pid_personality(struct seq_file *m, struct pid_namespace *ns,
2559 struct pid *pid, struct task_struct *task)
2560{
2561 seq_printf(m, "%08x\n", task->personality);
2562 return 0;
2563}
2564
Eric W. Biederman801199c2006-10-02 02:18:48 -07002565/*
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002566 * Thread groups
2567 */
Arjan van de Ven00977a52007-02-12 00:55:34 -08002568static const struct file_operations proc_task_operations;
Arjan van de Venc5ef1c42007-02-12 00:55:40 -08002569static const struct inode_operations proc_task_inode_operations;
Eric W. Biederman20cdc892006-10-02 02:17:07 -07002570
Eric Dumazetc5141e62007-05-08 00:26:15 -07002571static const struct pid_entry tgid_base_stuff[] = {
Alexey Dobriyan631f9c12008-11-10 01:32:52 +03002572 DIR("task", S_IRUGO|S_IXUGO, proc_task_inode_operations, proc_task_operations),
2573 DIR("fd", S_IRUSR|S_IXUSR, proc_fd_inode_operations, proc_fd_operations),
2574 DIR("fdinfo", S_IRUSR|S_IXUSR, proc_fdinfo_inode_operations, proc_fdinfo_operations),
Andrew Mortonb2211a32008-03-11 18:03:35 -07002575#ifdef CONFIG_NET
Alexey Dobriyan631f9c12008-11-10 01:32:52 +03002576 DIR("net", S_IRUGO|S_IXUGO, proc_net_inode_operations, proc_net_operations),
Andrew Mortonb2211a32008-03-11 18:03:35 -07002577#endif
Alexey Dobriyan631f9c12008-11-10 01:32:52 +03002578 REG("environ", S_IRUSR, proc_environ_operations),
2579 INF("auxv", S_IRUSR, proc_pid_auxv),
2580 ONE("status", S_IRUGO, proc_pid_status),
2581 ONE("personality", S_IRUSR, proc_pid_personality),
2582 INF("limits", S_IRUSR, proc_pid_limits),
Ingo Molnar43ae34c2007-07-09 18:52:00 +02002583#ifdef CONFIG_SCHED_DEBUG
Alexey Dobriyan631f9c12008-11-10 01:32:52 +03002584 REG("sched", S_IRUGO|S_IWUSR, proc_pid_sched_operations),
Ingo Molnar43ae34c2007-07-09 18:52:00 +02002585#endif
john stultz4614a696b2009-12-14 18:00:05 -08002586 REG("comm", S_IRUGO|S_IWUSR, proc_pid_set_comm_operations),
Roland McGrathebcb6732008-07-25 19:46:00 -07002587#ifdef CONFIG_HAVE_ARCH_TRACEHOOK
Alexey Dobriyan631f9c12008-11-10 01:32:52 +03002588 INF("syscall", S_IRUSR, proc_pid_syscall),
Roland McGrathebcb6732008-07-25 19:46:00 -07002589#endif
Alexey Dobriyan631f9c12008-11-10 01:32:52 +03002590 INF("cmdline", S_IRUGO, proc_pid_cmdline),
2591 ONE("stat", S_IRUGO, proc_tgid_stat),
2592 ONE("statm", S_IRUGO, proc_pid_statm),
2593 REG("maps", S_IRUGO, proc_maps_operations),
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002594#ifdef CONFIG_NUMA
Alexey Dobriyan631f9c12008-11-10 01:32:52 +03002595 REG("numa_maps", S_IRUGO, proc_numa_maps_operations),
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002596#endif
Alexey Dobriyan631f9c12008-11-10 01:32:52 +03002597 REG("mem", S_IRUSR|S_IWUSR, proc_mem_operations),
2598 LNK("cwd", proc_cwd_link),
2599 LNK("root", proc_root_link),
2600 LNK("exe", proc_exe_link),
2601 REG("mounts", S_IRUGO, proc_mounts_operations),
2602 REG("mountinfo", S_IRUGO, proc_mountinfo_operations),
2603 REG("mountstats", S_IRUSR, proc_mountstats_operations),
Matt Mackall1e883282008-02-04 22:29:07 -08002604#ifdef CONFIG_PROC_PAGE_MONITOR
Alexey Dobriyan631f9c12008-11-10 01:32:52 +03002605 REG("clear_refs", S_IWUSR, proc_clear_refs_operations),
2606 REG("smaps", S_IRUGO, proc_smaps_operations),
2607 REG("pagemap", S_IRUSR, proc_pagemap_operations),
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002608#endif
2609#ifdef CONFIG_SECURITY
Alexey Dobriyan631f9c12008-11-10 01:32:52 +03002610 DIR("attr", S_IRUGO|S_IXUGO, proc_attr_dir_inode_operations, proc_attr_dir_operations),
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002611#endif
2612#ifdef CONFIG_KALLSYMS
Alexey Dobriyan631f9c12008-11-10 01:32:52 +03002613 INF("wchan", S_IRUGO, proc_pid_wchan),
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002614#endif
Ken Chen2ec220e2008-11-10 11:26:08 +03002615#ifdef CONFIG_STACKTRACE
2616 ONE("stack", S_IRUSR, proc_pid_stack),
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002617#endif
2618#ifdef CONFIG_SCHEDSTATS
Alexey Dobriyan631f9c12008-11-10 01:32:52 +03002619 INF("schedstat", S_IRUGO, proc_pid_schedstat),
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002620#endif
Arjan van de Ven97455122008-01-25 21:08:34 +01002621#ifdef CONFIG_LATENCYTOP
Alexey Dobriyan631f9c12008-11-10 01:32:52 +03002622 REG("latency", S_IRUGO, proc_lstats_operations),
Arjan van de Ven97455122008-01-25 21:08:34 +01002623#endif
Paul Menage8793d852007-10-18 23:39:39 -07002624#ifdef CONFIG_PROC_PID_CPUSET
Alexey Dobriyan631f9c12008-11-10 01:32:52 +03002625 REG("cpuset", S_IRUGO, proc_cpuset_operations),
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002626#endif
Paul Menagea4243162007-10-18 23:39:35 -07002627#ifdef CONFIG_CGROUPS
Alexey Dobriyan631f9c12008-11-10 01:32:52 +03002628 REG("cgroup", S_IRUGO, proc_cgroup_operations),
Paul Menagea4243162007-10-18 23:39:35 -07002629#endif
Alexey Dobriyan631f9c12008-11-10 01:32:52 +03002630 INF("oom_score", S_IRUGO, proc_oom_score),
2631 REG("oom_adj", S_IRUGO|S_IWUSR, proc_oom_adjust_operations),
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002632#ifdef CONFIG_AUDITSYSCALL
Alexey Dobriyan631f9c12008-11-10 01:32:52 +03002633 REG("loginuid", S_IWUSR|S_IRUGO, proc_loginuid_operations),
2634 REG("sessionid", S_IRUGO, proc_sessionid_operations),
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002635#endif
Akinobu Mitaf4f154f2006-12-08 02:39:47 -08002636#ifdef CONFIG_FAULT_INJECTION
Alexey Dobriyan631f9c12008-11-10 01:32:52 +03002637 REG("make-it-fail", S_IRUGO|S_IWUSR, proc_fault_inject_operations),
Akinobu Mitaf4f154f2006-12-08 02:39:47 -08002638#endif
Christoph Hellwig698ba7b2009-12-15 16:47:37 -08002639#ifdef CONFIG_ELF_CORE
Alexey Dobriyan631f9c12008-11-10 01:32:52 +03002640 REG("coredump_filter", S_IRUGO|S_IWUSR, proc_coredump_filter_operations),
Kawai, Hidehiro3cb4a0b2007-07-19 01:48:28 -07002641#endif
Andrew Mortonaba76fd2006-12-10 02:19:48 -08002642#ifdef CONFIG_TASK_IO_ACCOUNTING
Alexey Dobriyan631f9c12008-11-10 01:32:52 +03002643 INF("io", S_IRUGO, proc_tgid_io_accounting),
Andrew Mortonaba76fd2006-12-10 02:19:48 -08002644#endif
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002645};
2646
2647static int proc_tgid_base_readdir(struct file * filp,
2648 void * dirent, filldir_t filldir)
2649{
2650 return proc_pident_readdir(filp,dirent,filldir,
2651 tgid_base_stuff,ARRAY_SIZE(tgid_base_stuff));
2652}
2653
Arjan van de Ven00977a52007-02-12 00:55:34 -08002654static const struct file_operations proc_tgid_base_operations = {
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002655 .read = generic_read_dir,
2656 .readdir = proc_tgid_base_readdir,
2657};
2658
2659static struct dentry *proc_tgid_base_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd){
Eric W. Biederman7bcd6b02006-10-02 02:18:56 -07002660 return proc_pident_lookup(dir, dentry,
2661 tgid_base_stuff, ARRAY_SIZE(tgid_base_stuff));
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002662}
2663
Arjan van de Venc5ef1c42007-02-12 00:55:40 -08002664static const struct inode_operations proc_tgid_base_inode_operations = {
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002665 .lookup = proc_tgid_base_lookup,
2666 .getattr = pid_getattr,
2667 .setattr = proc_setattr,
2668};
2669
Pavel Emelyanov60347f62007-10-18 23:40:03 -07002670static void proc_flush_task_mnt(struct vfsmount *mnt, pid_t pid, pid_t tgid)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002671{
Eric W. Biederman48e64842006-06-26 00:25:48 -07002672 struct dentry *dentry, *leader, *dir;
Eric W. Biederman8578cea2006-06-26 00:25:54 -07002673 char buf[PROC_NUMBUF];
Eric W. Biederman48e64842006-06-26 00:25:48 -07002674 struct qstr name;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002675
Eric W. Biederman48e64842006-06-26 00:25:48 -07002676 name.name = buf;
Pavel Emelyanov60347f62007-10-18 23:40:03 -07002677 name.len = snprintf(buf, sizeof(buf), "%d", pid);
2678 dentry = d_hash_and_lookup(mnt->mnt_root, &name);
Eric W. Biederman48e64842006-06-26 00:25:48 -07002679 if (dentry) {
Sukadev Bhattiprolu29f12ca2009-11-11 14:26:32 -08002680 shrink_dcache_parent(dentry);
Eric W. Biederman48e64842006-06-26 00:25:48 -07002681 d_drop(dentry);
2682 dput(dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002683 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002684
Eric W. Biederman48e64842006-06-26 00:25:48 -07002685 name.name = buf;
Pavel Emelyanov60347f62007-10-18 23:40:03 -07002686 name.len = snprintf(buf, sizeof(buf), "%d", tgid);
2687 leader = d_hash_and_lookup(mnt->mnt_root, &name);
Eric W. Biederman48e64842006-06-26 00:25:48 -07002688 if (!leader)
2689 goto out;
2690
2691 name.name = "task";
2692 name.len = strlen(name.name);
2693 dir = d_hash_and_lookup(leader, &name);
2694 if (!dir)
2695 goto out_put_leader;
2696
2697 name.name = buf;
Pavel Emelyanov60347f62007-10-18 23:40:03 -07002698 name.len = snprintf(buf, sizeof(buf), "%d", pid);
Eric W. Biederman48e64842006-06-26 00:25:48 -07002699 dentry = d_hash_and_lookup(dir, &name);
2700 if (dentry) {
2701 shrink_dcache_parent(dentry);
2702 d_drop(dentry);
2703 dput(dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002704 }
Eric W. Biederman48e64842006-06-26 00:25:48 -07002705
2706 dput(dir);
2707out_put_leader:
2708 dput(leader);
2709out:
2710 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002711}
2712
Randy Dunlap0895e912007-10-21 21:00:10 -07002713/**
2714 * proc_flush_task - Remove dcache entries for @task from the /proc dcache.
2715 * @task: task that should be flushed.
2716 *
2717 * When flushing dentries from proc, one needs to flush them from global
Pavel Emelyanov60347f62007-10-18 23:40:03 -07002718 * proc (proc_mnt) and from all the namespaces' procs this task was seen
Randy Dunlap0895e912007-10-21 21:00:10 -07002719 * in. This call is supposed to do all of this job.
2720 *
2721 * Looks in the dcache for
2722 * /proc/@pid
2723 * /proc/@tgid/task/@pid
2724 * if either directory is present flushes it and all of it'ts children
2725 * from the dcache.
2726 *
2727 * It is safe and reasonable to cache /proc entries for a task until
2728 * that task exits. After that they just clog up the dcache with
2729 * useless entries, possibly causing useful dcache entries to be
2730 * flushed instead. This routine is proved to flush those useless
2731 * dcache entries at process exit time.
2732 *
2733 * NOTE: This routine is just an optimization so it does not guarantee
2734 * that no dcache entries will exist at process exit time it
2735 * just makes it very unlikely that any will persist.
Pavel Emelyanov60347f62007-10-18 23:40:03 -07002736 */
2737
2738void proc_flush_task(struct task_struct *task)
2739{
Eric W. Biederman9fcc2d12007-11-14 17:00:07 -08002740 int i;
Oleg Nesterov9b4d1cbe2009-09-22 16:45:34 -07002741 struct pid *pid, *tgid;
Pavel Emelyanov130f77e2007-10-18 23:40:11 -07002742 struct upid *upid;
2743
Pavel Emelyanov130f77e2007-10-18 23:40:11 -07002744 pid = task_pid(task);
Oleg Nesterov9b4d1cbe2009-09-22 16:45:34 -07002745 tgid = task_tgid(task);
Pavel Emelyanov130f77e2007-10-18 23:40:11 -07002746
Eric W. Biederman9fcc2d12007-11-14 17:00:07 -08002747 for (i = 0; i <= pid->level; i++) {
Pavel Emelyanov130f77e2007-10-18 23:40:11 -07002748 upid = &pid->numbers[i];
2749 proc_flush_task_mnt(upid->ns->proc_mnt, upid->nr,
Oleg Nesterov9b4d1cbe2009-09-22 16:45:34 -07002750 tgid->numbers[i].nr);
Pavel Emelyanov130f77e2007-10-18 23:40:11 -07002751 }
Pavel Emelyanov6f4e6432007-10-18 23:40:11 -07002752
2753 upid = &pid->numbers[pid->level];
2754 if (upid->nr == 1)
2755 pid_ns_release_proc(upid->ns);
Pavel Emelyanov60347f62007-10-18 23:40:03 -07002756}
2757
Adrian Bunk9711ef92006-12-06 20:38:31 -08002758static struct dentry *proc_pid_instantiate(struct inode *dir,
2759 struct dentry * dentry,
Eric Dumazetc5141e62007-05-08 00:26:15 -07002760 struct task_struct *task, const void *ptr)
Eric W. Biederman444ceed2006-10-02 02:18:49 -07002761{
2762 struct dentry *error = ERR_PTR(-ENOENT);
2763 struct inode *inode;
2764
Eric W. Biederman61a28782006-10-02 02:18:49 -07002765 inode = proc_pid_make_inode(dir->i_sb, task);
Eric W. Biederman444ceed2006-10-02 02:18:49 -07002766 if (!inode)
2767 goto out;
2768
2769 inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO;
2770 inode->i_op = &proc_tgid_base_inode_operations;
2771 inode->i_fop = &proc_tgid_base_operations;
2772 inode->i_flags|=S_IMMUTABLE;
Vegard Nossumaed54172008-06-05 22:46:53 -07002773
2774 inode->i_nlink = 2 + pid_entry_count_dirs(tgid_base_stuff,
2775 ARRAY_SIZE(tgid_base_stuff));
Eric W. Biederman444ceed2006-10-02 02:18:49 -07002776
2777 dentry->d_op = &pid_dentry_operations;
2778
2779 d_add(dentry, inode);
2780 /* Close the race of the process dying before we return the dentry */
2781 if (pid_revalidate(dentry, NULL))
2782 error = NULL;
2783out:
2784 return error;
2785}
2786
Linus Torvalds1da177e2005-04-16 15:20:36 -07002787struct dentry *proc_pid_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd)
2788{
Eric W. Biedermancd6a3ce2006-06-26 00:25:49 -07002789 struct dentry *result = ERR_PTR(-ENOENT);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002790 struct task_struct *task;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002791 unsigned tgid;
Pavel Emelyanovb4888932007-10-18 23:40:14 -07002792 struct pid_namespace *ns;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002793
Eric W. Biederman801199c2006-10-02 02:18:48 -07002794 result = proc_base_lookup(dir, dentry);
2795 if (!IS_ERR(result) || PTR_ERR(result) != -ENOENT)
2796 goto out;
2797
Linus Torvalds1da177e2005-04-16 15:20:36 -07002798 tgid = name_to_int(dentry);
2799 if (tgid == ~0U)
2800 goto out;
2801
Pavel Emelyanovb4888932007-10-18 23:40:14 -07002802 ns = dentry->d_sb->s_fs_info;
Eric W. Biedermande758732006-06-26 00:25:51 -07002803 rcu_read_lock();
Pavel Emelyanovb4888932007-10-18 23:40:14 -07002804 task = find_task_by_pid_ns(tgid, ns);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002805 if (task)
2806 get_task_struct(task);
Eric W. Biedermande758732006-06-26 00:25:51 -07002807 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002808 if (!task)
2809 goto out;
2810
Eric W. Biederman444ceed2006-10-02 02:18:49 -07002811 result = proc_pid_instantiate(dir, dentry, task, NULL);
Eric W. Biederman48e64842006-06-26 00:25:48 -07002812 put_task_struct(task);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002813out:
Eric W. Biedermancd6a3ce2006-06-26 00:25:49 -07002814 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002815}
2816
Linus Torvalds1da177e2005-04-16 15:20:36 -07002817/*
Eric W. Biederman0804ef42006-10-02 02:17:04 -07002818 * Find the first task with tgid >= tgid
Eric W. Biederman0bc58a92006-06-26 00:25:50 -07002819 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07002820 */
Eric W. Biederman19fd4bb2007-11-28 16:21:26 -08002821struct tgid_iter {
2822 unsigned int tgid;
Eric W. Biederman0804ef42006-10-02 02:17:04 -07002823 struct task_struct *task;
Eric W. Biederman19fd4bb2007-11-28 16:21:26 -08002824};
2825static struct tgid_iter next_tgid(struct pid_namespace *ns, struct tgid_iter iter)
2826{
Eric W. Biederman0804ef42006-10-02 02:17:04 -07002827 struct pid *pid;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002828
Eric W. Biederman19fd4bb2007-11-28 16:21:26 -08002829 if (iter.task)
2830 put_task_struct(iter.task);
Eric W. Biederman0804ef42006-10-02 02:17:04 -07002831 rcu_read_lock();
2832retry:
Eric W. Biederman19fd4bb2007-11-28 16:21:26 -08002833 iter.task = NULL;
2834 pid = find_ge_pid(iter.tgid, ns);
Eric W. Biederman0804ef42006-10-02 02:17:04 -07002835 if (pid) {
Eric W. Biederman19fd4bb2007-11-28 16:21:26 -08002836 iter.tgid = pid_nr_ns(pid, ns);
2837 iter.task = pid_task(pid, PIDTYPE_PID);
Eric W. Biederman0804ef42006-10-02 02:17:04 -07002838 /* What we to know is if the pid we have find is the
2839 * pid of a thread_group_leader. Testing for task
2840 * being a thread_group_leader is the obvious thing
2841 * todo but there is a window when it fails, due to
2842 * the pid transfer logic in de_thread.
2843 *
2844 * So we perform the straight forward test of seeing
2845 * if the pid we have found is the pid of a thread
2846 * group leader, and don't worry if the task we have
2847 * found doesn't happen to be a thread group leader.
2848 * As we don't care in the case of readdir.
2849 */
Eric W. Biederman19fd4bb2007-11-28 16:21:26 -08002850 if (!iter.task || !has_group_leader_pid(iter.task)) {
2851 iter.tgid += 1;
Eric W. Biederman0804ef42006-10-02 02:17:04 -07002852 goto retry;
Eric W. Biederman19fd4bb2007-11-28 16:21:26 -08002853 }
2854 get_task_struct(iter.task);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002855 }
Eric W. Biederman454cc102006-06-26 00:25:51 -07002856 rcu_read_unlock();
Eric W. Biederman19fd4bb2007-11-28 16:21:26 -08002857 return iter;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002858}
2859
Eric W. Biederman7bcd6b02006-10-02 02:18:56 -07002860#define TGID_OFFSET (FIRST_PROCESS_ENTRY + ARRAY_SIZE(proc_base_stuff))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002861
Eric W. Biederman61a28782006-10-02 02:18:49 -07002862static int proc_pid_fill_cache(struct file *filp, void *dirent, filldir_t filldir,
Eric W. Biederman19fd4bb2007-11-28 16:21:26 -08002863 struct tgid_iter iter)
Eric W. Biederman61a28782006-10-02 02:18:49 -07002864{
2865 char name[PROC_NUMBUF];
Eric W. Biederman19fd4bb2007-11-28 16:21:26 -08002866 int len = snprintf(name, sizeof(name), "%d", iter.tgid);
Eric W. Biederman61a28782006-10-02 02:18:49 -07002867 return proc_fill_cache(filp, dirent, filldir, name, len,
Eric W. Biederman19fd4bb2007-11-28 16:21:26 -08002868 proc_pid_instantiate, iter.task, NULL);
Eric W. Biederman61a28782006-10-02 02:18:49 -07002869}
2870
Linus Torvalds1da177e2005-04-16 15:20:36 -07002871/* for the /proc/ directory itself, after non-process stuff has been done */
2872int proc_pid_readdir(struct file * filp, void * dirent, filldir_t filldir)
2873{
Linus Torvalds1da177e2005-04-16 15:20:36 -07002874 unsigned int nr = filp->f_pos - FIRST_PROCESS_ENTRY;
Josef "Jeff" Sipek2fddfee2006-12-08 02:36:36 -08002875 struct task_struct *reaper = get_proc_task(filp->f_path.dentry->d_inode);
Eric W. Biederman19fd4bb2007-11-28 16:21:26 -08002876 struct tgid_iter iter;
Pavel Emelyanovb4888932007-10-18 23:40:14 -07002877 struct pid_namespace *ns;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002878
Eric W. Biederman61a28782006-10-02 02:18:49 -07002879 if (!reaper)
2880 goto out_no_task;
2881
Eric W. Biederman7bcd6b02006-10-02 02:18:56 -07002882 for (; nr < ARRAY_SIZE(proc_base_stuff); filp->f_pos++, nr++) {
Eric Dumazetc5141e62007-05-08 00:26:15 -07002883 const struct pid_entry *p = &proc_base_stuff[nr];
Eric W. Biederman61a28782006-10-02 02:18:49 -07002884 if (proc_base_fill_cache(filp, dirent, filldir, reaper, p) < 0)
Eric W. Biederman801199c2006-10-02 02:18:48 -07002885 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002886 }
2887
Pavel Emelyanovb4888932007-10-18 23:40:14 -07002888 ns = filp->f_dentry->d_sb->s_fs_info;
Eric W. Biederman19fd4bb2007-11-28 16:21:26 -08002889 iter.task = NULL;
2890 iter.tgid = filp->f_pos - TGID_OFFSET;
2891 for (iter = next_tgid(ns, iter);
2892 iter.task;
2893 iter.tgid += 1, iter = next_tgid(ns, iter)) {
2894 filp->f_pos = iter.tgid + TGID_OFFSET;
2895 if (proc_pid_fill_cache(filp, dirent, filldir, iter) < 0) {
2896 put_task_struct(iter.task);
Eric W. Biederman0804ef42006-10-02 02:17:04 -07002897 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002898 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002899 }
Eric W. Biederman0804ef42006-10-02 02:17:04 -07002900 filp->f_pos = PID_MAX_LIMIT + TGID_OFFSET;
2901out:
Eric W. Biederman61a28782006-10-02 02:18:49 -07002902 put_task_struct(reaper);
2903out_no_task:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002904 return 0;
2905}
2906
Eric W. Biederman0bc58a92006-06-26 00:25:50 -07002907/*
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002908 * Tasks
2909 */
Eric Dumazetc5141e62007-05-08 00:26:15 -07002910static const struct pid_entry tid_base_stuff[] = {
Alexey Dobriyan631f9c12008-11-10 01:32:52 +03002911 DIR("fd", S_IRUSR|S_IXUSR, proc_fd_inode_operations, proc_fd_operations),
Jerome Marchand38355412010-04-27 13:13:06 -07002912 DIR("fdinfo", S_IRUSR|S_IXUSR, proc_fdinfo_inode_operations, proc_fdinfo_operations),
Alexey Dobriyan631f9c12008-11-10 01:32:52 +03002913 REG("environ", S_IRUSR, proc_environ_operations),
2914 INF("auxv", S_IRUSR, proc_pid_auxv),
2915 ONE("status", S_IRUGO, proc_pid_status),
2916 ONE("personality", S_IRUSR, proc_pid_personality),
2917 INF("limits", S_IRUSR, proc_pid_limits),
Ingo Molnar43ae34c2007-07-09 18:52:00 +02002918#ifdef CONFIG_SCHED_DEBUG
Alexey Dobriyan631f9c12008-11-10 01:32:52 +03002919 REG("sched", S_IRUGO|S_IWUSR, proc_pid_sched_operations),
Ingo Molnar43ae34c2007-07-09 18:52:00 +02002920#endif
john stultz4614a696b2009-12-14 18:00:05 -08002921 REG("comm", S_IRUGO|S_IWUSR, proc_pid_set_comm_operations),
Roland McGrathebcb6732008-07-25 19:46:00 -07002922#ifdef CONFIG_HAVE_ARCH_TRACEHOOK
Alexey Dobriyan631f9c12008-11-10 01:32:52 +03002923 INF("syscall", S_IRUSR, proc_pid_syscall),
Roland McGrathebcb6732008-07-25 19:46:00 -07002924#endif
Alexey Dobriyan631f9c12008-11-10 01:32:52 +03002925 INF("cmdline", S_IRUGO, proc_pid_cmdline),
2926 ONE("stat", S_IRUGO, proc_tid_stat),
2927 ONE("statm", S_IRUGO, proc_pid_statm),
2928 REG("maps", S_IRUGO, proc_maps_operations),
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002929#ifdef CONFIG_NUMA
Alexey Dobriyan631f9c12008-11-10 01:32:52 +03002930 REG("numa_maps", S_IRUGO, proc_numa_maps_operations),
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002931#endif
Alexey Dobriyan631f9c12008-11-10 01:32:52 +03002932 REG("mem", S_IRUSR|S_IWUSR, proc_mem_operations),
2933 LNK("cwd", proc_cwd_link),
2934 LNK("root", proc_root_link),
2935 LNK("exe", proc_exe_link),
2936 REG("mounts", S_IRUGO, proc_mounts_operations),
2937 REG("mountinfo", S_IRUGO, proc_mountinfo_operations),
Matt Mackall1e883282008-02-04 22:29:07 -08002938#ifdef CONFIG_PROC_PAGE_MONITOR
Alexey Dobriyan631f9c12008-11-10 01:32:52 +03002939 REG("clear_refs", S_IWUSR, proc_clear_refs_operations),
2940 REG("smaps", S_IRUGO, proc_smaps_operations),
2941 REG("pagemap", S_IRUSR, proc_pagemap_operations),
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002942#endif
2943#ifdef CONFIG_SECURITY
Alexey Dobriyan631f9c12008-11-10 01:32:52 +03002944 DIR("attr", S_IRUGO|S_IXUGO, proc_attr_dir_inode_operations, proc_attr_dir_operations),
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002945#endif
2946#ifdef CONFIG_KALLSYMS
Alexey Dobriyan631f9c12008-11-10 01:32:52 +03002947 INF("wchan", S_IRUGO, proc_pid_wchan),
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002948#endif
Ken Chen2ec220e2008-11-10 11:26:08 +03002949#ifdef CONFIG_STACKTRACE
2950 ONE("stack", S_IRUSR, proc_pid_stack),
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002951#endif
2952#ifdef CONFIG_SCHEDSTATS
Alexey Dobriyan631f9c12008-11-10 01:32:52 +03002953 INF("schedstat", S_IRUGO, proc_pid_schedstat),
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002954#endif
Arjan van de Ven97455122008-01-25 21:08:34 +01002955#ifdef CONFIG_LATENCYTOP
Alexey Dobriyan631f9c12008-11-10 01:32:52 +03002956 REG("latency", S_IRUGO, proc_lstats_operations),
Arjan van de Ven97455122008-01-25 21:08:34 +01002957#endif
Paul Menage8793d852007-10-18 23:39:39 -07002958#ifdef CONFIG_PROC_PID_CPUSET
Alexey Dobriyan631f9c12008-11-10 01:32:52 +03002959 REG("cpuset", S_IRUGO, proc_cpuset_operations),
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002960#endif
Paul Menagea4243162007-10-18 23:39:35 -07002961#ifdef CONFIG_CGROUPS
Alexey Dobriyan631f9c12008-11-10 01:32:52 +03002962 REG("cgroup", S_IRUGO, proc_cgroup_operations),
Paul Menagea4243162007-10-18 23:39:35 -07002963#endif
Alexey Dobriyan631f9c12008-11-10 01:32:52 +03002964 INF("oom_score", S_IRUGO, proc_oom_score),
2965 REG("oom_adj", S_IRUGO|S_IWUSR, proc_oom_adjust_operations),
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002966#ifdef CONFIG_AUDITSYSCALL
Alexey Dobriyan631f9c12008-11-10 01:32:52 +03002967 REG("loginuid", S_IWUSR|S_IRUGO, proc_loginuid_operations),
2968 REG("sessionid", S_IRUSR, proc_sessionid_operations),
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002969#endif
Akinobu Mitaf4f154f2006-12-08 02:39:47 -08002970#ifdef CONFIG_FAULT_INJECTION
Alexey Dobriyan631f9c12008-11-10 01:32:52 +03002971 REG("make-it-fail", S_IRUGO|S_IWUSR, proc_fault_inject_operations),
Akinobu Mitaf4f154f2006-12-08 02:39:47 -08002972#endif
Andrea Righi297c5d92008-07-25 01:48:49 -07002973#ifdef CONFIG_TASK_IO_ACCOUNTING
Alexey Dobriyan631f9c12008-11-10 01:32:52 +03002974 INF("io", S_IRUGO, proc_tid_io_accounting),
Andrea Righi297c5d92008-07-25 01:48:49 -07002975#endif
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002976};
2977
2978static int proc_tid_base_readdir(struct file * filp,
2979 void * dirent, filldir_t filldir)
2980{
2981 return proc_pident_readdir(filp,dirent,filldir,
2982 tid_base_stuff,ARRAY_SIZE(tid_base_stuff));
2983}
2984
2985static struct dentry *proc_tid_base_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd){
Eric W. Biederman7bcd6b02006-10-02 02:18:56 -07002986 return proc_pident_lookup(dir, dentry,
2987 tid_base_stuff, ARRAY_SIZE(tid_base_stuff));
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002988}
2989
Arjan van de Ven00977a52007-02-12 00:55:34 -08002990static const struct file_operations proc_tid_base_operations = {
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002991 .read = generic_read_dir,
2992 .readdir = proc_tid_base_readdir,
2993};
2994
Arjan van de Venc5ef1c42007-02-12 00:55:40 -08002995static const struct inode_operations proc_tid_base_inode_operations = {
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002996 .lookup = proc_tid_base_lookup,
2997 .getattr = pid_getattr,
2998 .setattr = proc_setattr,
2999};
3000
Eric W. Biederman444ceed2006-10-02 02:18:49 -07003001static struct dentry *proc_task_instantiate(struct inode *dir,
Eric Dumazetc5141e62007-05-08 00:26:15 -07003002 struct dentry *dentry, struct task_struct *task, const void *ptr)
Eric W. Biederman444ceed2006-10-02 02:18:49 -07003003{
3004 struct dentry *error = ERR_PTR(-ENOENT);
3005 struct inode *inode;
Eric W. Biederman61a28782006-10-02 02:18:49 -07003006 inode = proc_pid_make_inode(dir->i_sb, task);
Eric W. Biederman444ceed2006-10-02 02:18:49 -07003007
3008 if (!inode)
3009 goto out;
3010 inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO;
3011 inode->i_op = &proc_tid_base_inode_operations;
3012 inode->i_fop = &proc_tid_base_operations;
3013 inode->i_flags|=S_IMMUTABLE;
Vegard Nossumaed54172008-06-05 22:46:53 -07003014
3015 inode->i_nlink = 2 + pid_entry_count_dirs(tid_base_stuff,
3016 ARRAY_SIZE(tid_base_stuff));
Eric W. Biederman444ceed2006-10-02 02:18:49 -07003017
3018 dentry->d_op = &pid_dentry_operations;
3019
3020 d_add(dentry, inode);
3021 /* Close the race of the process dying before we return the dentry */
3022 if (pid_revalidate(dentry, NULL))
3023 error = NULL;
3024out:
3025 return error;
3026}
3027
Eric W. Biederman28a6d672006-10-02 02:17:05 -07003028static struct dentry *proc_task_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd)
3029{
3030 struct dentry *result = ERR_PTR(-ENOENT);
3031 struct task_struct *task;
3032 struct task_struct *leader = get_proc_task(dir);
Eric W. Biederman28a6d672006-10-02 02:17:05 -07003033 unsigned tid;
Pavel Emelyanovb4888932007-10-18 23:40:14 -07003034 struct pid_namespace *ns;
Eric W. Biederman28a6d672006-10-02 02:17:05 -07003035
3036 if (!leader)
3037 goto out_no_task;
3038
3039 tid = name_to_int(dentry);
3040 if (tid == ~0U)
3041 goto out;
3042
Pavel Emelyanovb4888932007-10-18 23:40:14 -07003043 ns = dentry->d_sb->s_fs_info;
Eric W. Biederman28a6d672006-10-02 02:17:05 -07003044 rcu_read_lock();
Pavel Emelyanovb4888932007-10-18 23:40:14 -07003045 task = find_task_by_pid_ns(tid, ns);
Eric W. Biederman28a6d672006-10-02 02:17:05 -07003046 if (task)
3047 get_task_struct(task);
3048 rcu_read_unlock();
3049 if (!task)
3050 goto out;
Pavel Emelyanovbac0abd2007-10-18 23:40:18 -07003051 if (!same_thread_group(leader, task))
Eric W. Biederman28a6d672006-10-02 02:17:05 -07003052 goto out_drop_task;
3053
Eric W. Biederman444ceed2006-10-02 02:18:49 -07003054 result = proc_task_instantiate(dir, dentry, task, NULL);
Eric W. Biederman28a6d672006-10-02 02:17:05 -07003055out_drop_task:
3056 put_task_struct(task);
3057out:
3058 put_task_struct(leader);
3059out_no_task:
3060 return result;
3061}
3062
3063/*
Eric W. Biederman0bc58a92006-06-26 00:25:50 -07003064 * Find the first tid of a thread group to return to user space.
3065 *
3066 * Usually this is just the thread group leader, but if the users
3067 * buffer was too small or there was a seek into the middle of the
3068 * directory we have more work todo.
3069 *
3070 * In the case of a short read we start with find_task_by_pid.
3071 *
3072 * In the case of a seek we start with the leader and walk nr
3073 * threads past it.
3074 */
Eric W. Biedermancc288732006-06-26 00:26:01 -07003075static struct task_struct *first_tid(struct task_struct *leader,
Pavel Emelyanovb4888932007-10-18 23:40:14 -07003076 int tid, int nr, struct pid_namespace *ns)
Eric W. Biederman0bc58a92006-06-26 00:25:50 -07003077{
Oleg Nesterova872ff02006-06-26 00:26:01 -07003078 struct task_struct *pos;
Eric W. Biederman0bc58a92006-06-26 00:25:50 -07003079
Eric W. Biedermancc288732006-06-26 00:26:01 -07003080 rcu_read_lock();
Eric W. Biederman0bc58a92006-06-26 00:25:50 -07003081 /* Attempt to start with the pid of a thread */
3082 if (tid && (nr > 0)) {
Pavel Emelyanovb4888932007-10-18 23:40:14 -07003083 pos = find_task_by_pid_ns(tid, ns);
Oleg Nesterova872ff02006-06-26 00:26:01 -07003084 if (pos && (pos->group_leader == leader))
3085 goto found;
Eric W. Biederman0bc58a92006-06-26 00:25:50 -07003086 }
3087
3088 /* If nr exceeds the number of threads there is nothing todo */
Eric W. Biederman0bc58a92006-06-26 00:25:50 -07003089 pos = NULL;
Oleg Nesterova872ff02006-06-26 00:26:01 -07003090 if (nr && nr >= get_nr_threads(leader))
3091 goto out;
3092
3093 /* If we haven't found our starting place yet start
3094 * with the leader and walk nr threads forward.
3095 */
3096 for (pos = leader; nr > 0; --nr) {
3097 pos = next_thread(pos);
3098 if (pos == leader) {
3099 pos = NULL;
3100 goto out;
3101 }
3102 }
3103found:
3104 get_task_struct(pos);
3105out:
Eric W. Biedermancc288732006-06-26 00:26:01 -07003106 rcu_read_unlock();
Eric W. Biederman0bc58a92006-06-26 00:25:50 -07003107 return pos;
3108}
3109
3110/*
3111 * Find the next thread in the thread list.
3112 * Return NULL if there is an error or no next thread.
3113 *
3114 * The reference to the input task_struct is released.
3115 */
3116static struct task_struct *next_tid(struct task_struct *start)
3117{
Oleg Nesterovc1df7fb2006-06-26 00:26:02 -07003118 struct task_struct *pos = NULL;
Eric W. Biedermancc288732006-06-26 00:26:01 -07003119 rcu_read_lock();
Oleg Nesterovc1df7fb2006-06-26 00:26:02 -07003120 if (pid_alive(start)) {
Eric W. Biederman0bc58a92006-06-26 00:25:50 -07003121 pos = next_thread(start);
Oleg Nesterovc1df7fb2006-06-26 00:26:02 -07003122 if (thread_group_leader(pos))
3123 pos = NULL;
3124 else
3125 get_task_struct(pos);
3126 }
Eric W. Biedermancc288732006-06-26 00:26:01 -07003127 rcu_read_unlock();
Eric W. Biederman0bc58a92006-06-26 00:25:50 -07003128 put_task_struct(start);
3129 return pos;
3130}
3131
Eric W. Biederman61a28782006-10-02 02:18:49 -07003132static int proc_task_fill_cache(struct file *filp, void *dirent, filldir_t filldir,
3133 struct task_struct *task, int tid)
3134{
3135 char name[PROC_NUMBUF];
3136 int len = snprintf(name, sizeof(name), "%d", tid);
3137 return proc_fill_cache(filp, dirent, filldir, name, len,
3138 proc_task_instantiate, task, NULL);
3139}
3140
Linus Torvalds1da177e2005-04-16 15:20:36 -07003141/* for the /proc/TGID/task/ directories */
3142static int proc_task_readdir(struct file * filp, void * dirent, filldir_t filldir)
3143{
Josef "Jeff" Sipek2fddfee2006-12-08 02:36:36 -08003144 struct dentry *dentry = filp->f_path.dentry;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003145 struct inode *inode = dentry->d_inode;
Guillaume Chazarain7d895242007-01-31 23:48:14 -08003146 struct task_struct *leader = NULL;
Eric W. Biederman0bc58a92006-06-26 00:25:50 -07003147 struct task_struct *task;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003148 int retval = -ENOENT;
3149 ino_t ino;
Eric W. Biederman0bc58a92006-06-26 00:25:50 -07003150 int tid;
Pavel Emelyanovb4888932007-10-18 23:40:14 -07003151 struct pid_namespace *ns;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003152
Guillaume Chazarain7d895242007-01-31 23:48:14 -08003153 task = get_proc_task(inode);
3154 if (!task)
3155 goto out_no_task;
3156 rcu_read_lock();
3157 if (pid_alive(task)) {
3158 leader = task->group_leader;
3159 get_task_struct(leader);
3160 }
3161 rcu_read_unlock();
3162 put_task_struct(task);
Eric W. Biederman99f89552006-06-26 00:25:55 -07003163 if (!leader)
3164 goto out_no_task;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003165 retval = 0;
3166
Linus Torvaldsee568b22009-03-17 10:02:35 -07003167 switch ((unsigned long)filp->f_pos) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07003168 case 0:
3169 ino = inode->i_ino;
Zhang Leee6f7792009-03-16 14:44:31 +08003170 if (filldir(dirent, ".", 1, filp->f_pos, ino, DT_DIR) < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003171 goto out;
Zhang Leee6f7792009-03-16 14:44:31 +08003172 filp->f_pos++;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003173 /* fall through */
3174 case 1:
3175 ino = parent_ino(dentry);
Zhang Leee6f7792009-03-16 14:44:31 +08003176 if (filldir(dirent, "..", 2, filp->f_pos, ino, DT_DIR) < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07003177 goto out;
Zhang Leee6f7792009-03-16 14:44:31 +08003178 filp->f_pos++;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003179 /* fall through */
3180 }
3181
Eric W. Biederman0bc58a92006-06-26 00:25:50 -07003182 /* f_version caches the tgid value that the last readdir call couldn't
3183 * return. lseek aka telldir automagically resets f_version to 0.
3184 */
Pavel Emelyanovb4888932007-10-18 23:40:14 -07003185 ns = filp->f_dentry->d_sb->s_fs_info;
Mathieu Desnoyers2b47c362007-10-16 23:27:21 -07003186 tid = (int)filp->f_version;
Eric W. Biederman0bc58a92006-06-26 00:25:50 -07003187 filp->f_version = 0;
Zhang Leee6f7792009-03-16 14:44:31 +08003188 for (task = first_tid(leader, tid, filp->f_pos - 2, ns);
Eric W. Biederman0bc58a92006-06-26 00:25:50 -07003189 task;
Zhang Leee6f7792009-03-16 14:44:31 +08003190 task = next_tid(task), filp->f_pos++) {
Pavel Emelyanovb4888932007-10-18 23:40:14 -07003191 tid = task_pid_nr_ns(task, ns);
Eric W. Biederman61a28782006-10-02 02:18:49 -07003192 if (proc_task_fill_cache(filp, dirent, filldir, task, tid) < 0) {
Eric W. Biederman0bc58a92006-06-26 00:25:50 -07003193 /* returning this tgid failed, save it as the first
3194 * pid for the next readir call */
Mathieu Desnoyers2b47c362007-10-16 23:27:21 -07003195 filp->f_version = (u64)tid;
Eric W. Biederman0bc58a92006-06-26 00:25:50 -07003196 put_task_struct(task);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003197 break;
Eric W. Biederman0bc58a92006-06-26 00:25:50 -07003198 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003199 }
3200out:
Eric W. Biederman99f89552006-06-26 00:25:55 -07003201 put_task_struct(leader);
3202out_no_task:
Linus Torvalds1da177e2005-04-16 15:20:36 -07003203 return retval;
3204}
Eric W. Biederman6e66b522006-06-26 00:25:47 -07003205
3206static int proc_task_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
3207{
3208 struct inode *inode = dentry->d_inode;
Eric W. Biederman99f89552006-06-26 00:25:55 -07003209 struct task_struct *p = get_proc_task(inode);
Eric W. Biederman6e66b522006-06-26 00:25:47 -07003210 generic_fillattr(inode, stat);
3211
Eric W. Biederman99f89552006-06-26 00:25:55 -07003212 if (p) {
Eric W. Biederman99f89552006-06-26 00:25:55 -07003213 stat->nlink += get_nr_threads(p);
Eric W. Biederman99f89552006-06-26 00:25:55 -07003214 put_task_struct(p);
Eric W. Biederman6e66b522006-06-26 00:25:47 -07003215 }
3216
3217 return 0;
3218}
Eric W. Biederman28a6d672006-10-02 02:17:05 -07003219
Arjan van de Venc5ef1c42007-02-12 00:55:40 -08003220static const struct inode_operations proc_task_inode_operations = {
Eric W. Biederman28a6d672006-10-02 02:17:05 -07003221 .lookup = proc_task_lookup,
3222 .getattr = proc_task_getattr,
3223 .setattr = proc_setattr,
3224};
3225
Arjan van de Ven00977a52007-02-12 00:55:34 -08003226static const struct file_operations proc_task_operations = {
Eric W. Biederman28a6d672006-10-02 02:17:05 -07003227 .read = generic_read_dir,
3228 .readdir = proc_task_readdir,
3229};