blob: 0c9de19a1633820856dae04bf71c21c3bed14da8 [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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070083#include "internal.h"
84
Eric W. Biederman0f2fe202006-06-26 00:25:46 -070085/* NOTE:
86 * Implementing inode permission operations in /proc is almost
87 * certainly an error. Permission checks need to happen during
88 * each system call not at open time. The reason is that most of
89 * what we wish to check for permissions in /proc varies at runtime.
90 *
91 * The classic example of a problem is opening file descriptors
92 * in /proc for a task before it execs a suid executable.
93 */
94
Linus Torvalds1da177e2005-04-16 15:20:36 -070095struct pid_entry {
Linus Torvalds1da177e2005-04-16 15:20:36 -070096 char *name;
Eric Dumazetc5141e62007-05-08 00:26:15 -070097 int len;
Linus Torvalds1da177e2005-04-16 15:20:36 -070098 mode_t mode;
Arjan van de Venc5ef1c42007-02-12 00:55:40 -080099 const struct inode_operations *iop;
Arjan van de Ven00977a52007-02-12 00:55:34 -0800100 const struct file_operations *fop;
Eric W. Biederman20cdc892006-10-02 02:17:07 -0700101 union proc_op op;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102};
103
Eric W. Biederman61a28782006-10-02 02:18:49 -0700104#define NOD(NAME, MODE, IOP, FOP, OP) { \
Eric W. Biederman20cdc892006-10-02 02:17:07 -0700105 .name = (NAME), \
Eric Dumazetc5141e62007-05-08 00:26:15 -0700106 .len = sizeof(NAME) - 1, \
Eric W. Biederman20cdc892006-10-02 02:17:07 -0700107 .mode = MODE, \
108 .iop = IOP, \
109 .fop = FOP, \
110 .op = OP, \
111}
112
Alexey Dobriyan631f9c12008-11-10 01:32:52 +0300113#define DIR(NAME, MODE, iops, fops) \
114 NOD(NAME, (S_IFDIR|(MODE)), &iops, &fops, {} )
115#define LNK(NAME, get_link) \
Eric W. Biederman61a28782006-10-02 02:18:49 -0700116 NOD(NAME, (S_IFLNK|S_IRWXUGO), \
Eric W. Biederman20cdc892006-10-02 02:17:07 -0700117 &proc_pid_link_inode_operations, NULL, \
Alexey Dobriyan631f9c12008-11-10 01:32:52 +0300118 { .proc_get_link = get_link } )
119#define REG(NAME, MODE, fops) \
120 NOD(NAME, (S_IFREG|(MODE)), NULL, &fops, {})
121#define INF(NAME, MODE, read) \
Eric W. Biederman61a28782006-10-02 02:18:49 -0700122 NOD(NAME, (S_IFREG|(MODE)), \
Eric W. Biederman20cdc892006-10-02 02:17:07 -0700123 NULL, &proc_info_file_operations, \
Alexey Dobriyan631f9c12008-11-10 01:32:52 +0300124 { .proc_read = read } )
125#define ONE(NAME, MODE, show) \
Eric W. Biedermanbe614082008-02-08 04:18:30 -0800126 NOD(NAME, (S_IFREG|(MODE)), \
127 NULL, &proc_single_file_operations, \
Alexey Dobriyan631f9c12008-11-10 01:32:52 +0300128 { .proc_show = show } )
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129
Vegard Nossumaed54172008-06-05 22:46:53 -0700130/*
131 * Count the number of hardlinks for the pid_entry table, excluding the .
132 * and .. links.
133 */
134static unsigned int pid_entry_count_dirs(const struct pid_entry *entries,
135 unsigned int n)
136{
137 unsigned int i;
138 unsigned int count;
139
140 count = 0;
141 for (i = 0; i < n; ++i) {
142 if (S_ISDIR(entries[i].mode))
143 ++count;
144 }
145
146 return count;
147}
148
Miklos Szeredi0494f6e2005-09-06 15:18:22 -0700149static struct fs_struct *get_fs_struct(struct task_struct *task)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150{
151 struct fs_struct *fs;
Miklos Szeredi0494f6e2005-09-06 15:18:22 -0700152 task_lock(task);
153 fs = task->fs;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154 if(fs)
155 atomic_inc(&fs->count);
Miklos Szeredi0494f6e2005-09-06 15:18:22 -0700156 task_unlock(task);
157 return fs;
158}
159
Eric W. Biederman99f89552006-06-26 00:25:55 -0700160static int get_nr_threads(struct task_struct *tsk)
161{
Eric W. Biederman99f89552006-06-26 00:25:55 -0700162 unsigned long flags;
163 int count = 0;
164
165 if (lock_task_sighand(tsk, &flags)) {
166 count = atomic_read(&tsk->signal->count);
167 unlock_task_sighand(tsk, &flags);
168 }
169 return count;
170}
171
Jan Blunck3dcd25f2008-02-14 19:38:35 -0800172static int proc_cwd_link(struct inode *inode, struct path *path)
Miklos Szeredi0494f6e2005-09-06 15:18:22 -0700173{
Eric W. Biederman99f89552006-06-26 00:25:55 -0700174 struct task_struct *task = get_proc_task(inode);
175 struct fs_struct *fs = NULL;
Miklos Szeredi0494f6e2005-09-06 15:18:22 -0700176 int result = -ENOENT;
Eric W. Biederman99f89552006-06-26 00:25:55 -0700177
178 if (task) {
179 fs = get_fs_struct(task);
180 put_task_struct(task);
181 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182 if (fs) {
183 read_lock(&fs->lock);
Jan Blunck3dcd25f2008-02-14 19:38:35 -0800184 *path = fs->pwd;
185 path_get(&fs->pwd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186 read_unlock(&fs->lock);
187 result = 0;
188 put_fs_struct(fs);
189 }
190 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);
196 struct fs_struct *fs = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197 int result = -ENOENT;
Eric W. Biederman99f89552006-06-26 00:25:55 -0700198
199 if (task) {
200 fs = get_fs_struct(task);
201 put_task_struct(task);
202 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203 if (fs) {
204 read_lock(&fs->lock);
Jan Blunck3dcd25f2008-02-14 19:38:35 -0800205 *path = fs->root;
206 path_get(&fs->root);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207 read_unlock(&fs->lock);
208 result = 0;
209 put_fs_struct(fs);
210 }
211 return result;
212}
213
Roland McGrath638fa202008-04-29 01:01:38 -0700214/*
215 * Return zero if current may access user memory in @task, -error if not.
216 */
217static int check_mem_permission(struct task_struct *task)
218{
219 /*
220 * A task can always look at itself, in case it chooses
221 * to use system calls instead of load instructions.
222 */
223 if (task == current)
224 return 0;
225
226 /*
227 * If current is actively ptrace'ing, and would also be
228 * permitted to freshly attach with ptrace now, permit it.
229 */
Roland McGrath0d094ef2008-07-25 19:45:49 -0700230 if (task_is_stopped_or_traced(task)) {
231 int match;
232 rcu_read_lock();
233 match = (tracehook_tracer_task(task) == current);
234 rcu_read_unlock();
235 if (match && ptrace_may_access(task, PTRACE_MODE_ATTACH))
236 return 0;
237 }
Roland McGrath638fa202008-04-29 01:01:38 -0700238
239 /*
240 * Noone else is allowed.
241 */
242 return -EPERM;
243}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244
Al Viro831830b2008-01-02 14:09:57 +0000245struct mm_struct *mm_for_maps(struct task_struct *task)
246{
247 struct mm_struct *mm = get_task_mm(task);
248 if (!mm)
249 return NULL;
250 down_read(&mm->mmap_sem);
251 task_lock(task);
252 if (task->mm != mm)
253 goto out;
Stephen Smalley006ebb42008-05-19 08:32:49 -0400254 if (task->mm != current->mm &&
255 __ptrace_may_access(task, PTRACE_MODE_READ) < 0)
Al Viro831830b2008-01-02 14:09:57 +0000256 goto out;
257 task_unlock(task);
258 return mm;
259out:
260 task_unlock(task);
261 up_read(&mm->mmap_sem);
262 mmput(mm);
263 return NULL;
264}
265
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266static int proc_pid_cmdline(struct task_struct *task, char * buffer)
267{
268 int res = 0;
269 unsigned int len;
270 struct mm_struct *mm = get_task_mm(task);
271 if (!mm)
272 goto out;
273 if (!mm->arg_end)
274 goto out_mm; /* Shh! No looking before we're done */
275
276 len = mm->arg_end - mm->arg_start;
277
278 if (len > PAGE_SIZE)
279 len = PAGE_SIZE;
280
281 res = access_process_vm(task, mm->arg_start, buffer, len, 0);
282
283 // If the nul at the end of args has been overwritten, then
284 // assume application is using setproctitle(3).
285 if (res > 0 && buffer[res-1] != '\0' && len < PAGE_SIZE) {
286 len = strnlen(buffer, res);
287 if (len < res) {
288 res = len;
289 } else {
290 len = mm->env_end - mm->env_start;
291 if (len > PAGE_SIZE - res)
292 len = PAGE_SIZE - res;
293 res += access_process_vm(task, mm->env_start, buffer+res, len, 0);
294 res = strnlen(buffer, res);
295 }
296 }
297out_mm:
298 mmput(mm);
299out:
300 return res;
301}
302
303static int proc_pid_auxv(struct task_struct *task, char *buffer)
304{
305 int res = 0;
306 struct mm_struct *mm = get_task_mm(task);
307 if (mm) {
308 unsigned int nwords = 0;
Hannes Ederdfe6b7d2008-12-30 18:49:13 +0300309 do {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310 nwords += 2;
Hannes Ederdfe6b7d2008-12-30 18:49:13 +0300311 } while (mm->saved_auxv[nwords - 2] != 0); /* AT_NULL */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312 res = nwords * sizeof(mm->saved_auxv[0]);
313 if (res > PAGE_SIZE)
314 res = PAGE_SIZE;
315 memcpy(buffer, mm->saved_auxv, res);
316 mmput(mm);
317 }
318 return res;
319}
320
321
322#ifdef CONFIG_KALLSYMS
323/*
324 * Provides a wchan file via kallsyms in a proper one-value-per-file format.
325 * Returns the resolved symbol. If that fails, simply return the address.
326 */
327static int proc_pid_wchan(struct task_struct *task, char *buffer)
328{
Alexey Dobriyanffb45122007-05-08 00:28:41 -0700329 unsigned long wchan;
Tejun Heo9281ace2007-07-17 04:03:51 -0700330 char symname[KSYM_NAME_LEN];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331
332 wchan = get_wchan(task);
333
Alexey Dobriyan9d65cb42007-05-08 00:28:43 -0700334 if (lookup_symbol_name(wchan, symname) < 0)
335 return sprintf(buffer, "%lu", wchan);
336 else
337 return sprintf(buffer, "%s", symname);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338}
339#endif /* CONFIG_KALLSYMS */
340
Ken Chen2ec220e2008-11-10 11:26:08 +0300341#ifdef CONFIG_STACKTRACE
342
343#define MAX_STACK_TRACE_DEPTH 64
344
345static int proc_pid_stack(struct seq_file *m, struct pid_namespace *ns,
346 struct pid *pid, struct task_struct *task)
347{
348 struct stack_trace trace;
349 unsigned long *entries;
350 int i;
351
352 entries = kmalloc(MAX_STACK_TRACE_DEPTH * sizeof(*entries), GFP_KERNEL);
353 if (!entries)
354 return -ENOMEM;
355
356 trace.nr_entries = 0;
357 trace.max_entries = MAX_STACK_TRACE_DEPTH;
358 trace.entries = entries;
359 trace.skip = 0;
360 save_stack_trace_tsk(task, &trace);
361
362 for (i = 0; i < trace.nr_entries; i++) {
363 seq_printf(m, "[<%p>] %pS\n",
364 (void *)entries[i], (void *)entries[i]);
365 }
366 kfree(entries);
367
368 return 0;
369}
370#endif
371
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372#ifdef CONFIG_SCHEDSTATS
373/*
374 * Provides /proc/PID/schedstat
375 */
376static int proc_pid_schedstat(struct task_struct *task, char *buffer)
377{
Balbir Singh172ba842007-07-09 18:52:00 +0200378 return sprintf(buffer, "%llu %llu %lu\n",
Ingo Molnar826e08b2008-12-22 07:37:41 +0100379 (unsigned long long)task->se.sum_exec_runtime,
380 (unsigned long long)task->sched_info.run_delay,
Ingo Molnar2d723762007-10-15 17:00:12 +0200381 task->sched_info.pcount);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382}
383#endif
384
Arjan van de Ven97455122008-01-25 21:08:34 +0100385#ifdef CONFIG_LATENCYTOP
386static int lstats_show_proc(struct seq_file *m, void *v)
387{
388 int i;
Hiroshi Shimamoto13d77c32008-02-20 16:53:29 -0800389 struct inode *inode = m->private;
390 struct task_struct *task = get_proc_task(inode);
Arjan van de Ven97455122008-01-25 21:08:34 +0100391
Hiroshi Shimamoto13d77c32008-02-20 16:53:29 -0800392 if (!task)
393 return -ESRCH;
394 seq_puts(m, "Latency Top version : v0.1\n");
Arjan van de Ven97455122008-01-25 21:08:34 +0100395 for (i = 0; i < 32; i++) {
396 if (task->latency_record[i].backtrace[0]) {
397 int q;
398 seq_printf(m, "%i %li %li ",
399 task->latency_record[i].count,
400 task->latency_record[i].time,
401 task->latency_record[i].max);
402 for (q = 0; q < LT_BACKTRACEDEPTH; q++) {
Hugh Dickins9c246242008-12-09 13:14:27 -0800403 char sym[KSYM_SYMBOL_LEN];
Arjan van de Ven97455122008-01-25 21:08:34 +0100404 char *c;
405 if (!task->latency_record[i].backtrace[q])
406 break;
407 if (task->latency_record[i].backtrace[q] == ULONG_MAX)
408 break;
409 sprint_symbol(sym, task->latency_record[i].backtrace[q]);
410 c = strchr(sym, '+');
411 if (c)
412 *c = 0;
413 seq_printf(m, "%s ", sym);
414 }
415 seq_printf(m, "\n");
416 }
417
418 }
Hiroshi Shimamoto13d77c32008-02-20 16:53:29 -0800419 put_task_struct(task);
Arjan van de Ven97455122008-01-25 21:08:34 +0100420 return 0;
421}
422
423static int lstats_open(struct inode *inode, struct file *file)
424{
Hiroshi Shimamoto13d77c32008-02-20 16:53:29 -0800425 return single_open(file, lstats_show_proc, inode);
Hiroshi Shimamotod6643d12008-02-14 10:27:00 -0800426}
427
Arjan van de Ven97455122008-01-25 21:08:34 +0100428static ssize_t lstats_write(struct file *file, const char __user *buf,
429 size_t count, loff_t *offs)
430{
Hiroshi Shimamoto13d77c32008-02-20 16:53:29 -0800431 struct task_struct *task = get_proc_task(file->f_dentry->d_inode);
Arjan van de Ven97455122008-01-25 21:08:34 +0100432
Hiroshi Shimamoto13d77c32008-02-20 16:53:29 -0800433 if (!task)
434 return -ESRCH;
Arjan van de Ven97455122008-01-25 21:08:34 +0100435 clear_all_latency_tracing(task);
Hiroshi Shimamoto13d77c32008-02-20 16:53:29 -0800436 put_task_struct(task);
Arjan van de Ven97455122008-01-25 21:08:34 +0100437
438 return count;
439}
440
441static const struct file_operations proc_lstats_operations = {
442 .open = lstats_open,
443 .read = seq_read,
444 .write = lstats_write,
445 .llseek = seq_lseek,
Hiroshi Shimamoto13d77c32008-02-20 16:53:29 -0800446 .release = single_release,
Arjan van de Ven97455122008-01-25 21:08:34 +0100447};
448
449#endif
450
Linus Torvalds1da177e2005-04-16 15:20:36 -0700451/* The badness from the OOM killer */
452unsigned long badness(struct task_struct *p, unsigned long uptime);
453static int proc_oom_score(struct task_struct *task, char *buffer)
454{
455 unsigned long points;
456 struct timespec uptime;
457
458 do_posix_clock_monotonic_gettime(&uptime);
Alexey Dobriyan19c5d452007-05-08 00:26:46 -0700459 read_lock(&tasklist_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460 points = badness(task, uptime.tv_sec);
Alexey Dobriyan19c5d452007-05-08 00:26:46 -0700461 read_unlock(&tasklist_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700462 return sprintf(buffer, "%lu\n", points);
463}
464
Neil Hormand85f50d2007-10-18 23:40:37 -0700465struct limit_names {
466 char *name;
467 char *unit;
468};
469
470static const struct limit_names lnames[RLIM_NLIMITS] = {
471 [RLIMIT_CPU] = {"Max cpu time", "ms"},
472 [RLIMIT_FSIZE] = {"Max file size", "bytes"},
473 [RLIMIT_DATA] = {"Max data size", "bytes"},
474 [RLIMIT_STACK] = {"Max stack size", "bytes"},
475 [RLIMIT_CORE] = {"Max core file size", "bytes"},
476 [RLIMIT_RSS] = {"Max resident set", "bytes"},
477 [RLIMIT_NPROC] = {"Max processes", "processes"},
478 [RLIMIT_NOFILE] = {"Max open files", "files"},
479 [RLIMIT_MEMLOCK] = {"Max locked memory", "bytes"},
480 [RLIMIT_AS] = {"Max address space", "bytes"},
481 [RLIMIT_LOCKS] = {"Max file locks", "locks"},
482 [RLIMIT_SIGPENDING] = {"Max pending signals", "signals"},
483 [RLIMIT_MSGQUEUE] = {"Max msgqueue size", "bytes"},
484 [RLIMIT_NICE] = {"Max nice priority", NULL},
485 [RLIMIT_RTPRIO] = {"Max realtime priority", NULL},
Eugene Teo88081172008-02-23 15:23:52 -0800486 [RLIMIT_RTTIME] = {"Max realtime timeout", "us"},
Neil Hormand85f50d2007-10-18 23:40:37 -0700487};
488
489/* Display limits for a process */
490static int proc_pid_limits(struct task_struct *task, char *buffer)
491{
492 unsigned int i;
493 int count = 0;
494 unsigned long flags;
495 char *bufptr = buffer;
496
497 struct rlimit rlim[RLIM_NLIMITS];
498
Lai Jiangshana6bebbc2008-10-05 00:51:15 +0400499 if (!lock_task_sighand(task, &flags))
Neil Hormand85f50d2007-10-18 23:40:37 -0700500 return 0;
Neil Hormand85f50d2007-10-18 23:40:37 -0700501 memcpy(rlim, task->signal->rlim, sizeof(struct rlimit) * RLIM_NLIMITS);
502 unlock_task_sighand(task, &flags);
Neil Hormand85f50d2007-10-18 23:40:37 -0700503
504 /*
505 * print the file header
506 */
507 count += sprintf(&bufptr[count], "%-25s %-20s %-20s %-10s\n",
508 "Limit", "Soft Limit", "Hard Limit", "Units");
509
510 for (i = 0; i < RLIM_NLIMITS; i++) {
511 if (rlim[i].rlim_cur == RLIM_INFINITY)
512 count += sprintf(&bufptr[count], "%-25s %-20s ",
513 lnames[i].name, "unlimited");
514 else
515 count += sprintf(&bufptr[count], "%-25s %-20lu ",
516 lnames[i].name, rlim[i].rlim_cur);
517
518 if (rlim[i].rlim_max == RLIM_INFINITY)
519 count += sprintf(&bufptr[count], "%-20s ", "unlimited");
520 else
521 count += sprintf(&bufptr[count], "%-20lu ",
522 rlim[i].rlim_max);
523
524 if (lnames[i].unit)
525 count += sprintf(&bufptr[count], "%-10s\n",
526 lnames[i].unit);
527 else
528 count += sprintf(&bufptr[count], "\n");
529 }
530
531 return count;
532}
533
Roland McGrathebcb6732008-07-25 19:46:00 -0700534#ifdef CONFIG_HAVE_ARCH_TRACEHOOK
535static int proc_pid_syscall(struct task_struct *task, char *buffer)
536{
537 long nr;
538 unsigned long args[6], sp, pc;
539
540 if (task_current_syscall(task, &nr, args, 6, &sp, &pc))
541 return sprintf(buffer, "running\n");
542
543 if (nr < 0)
544 return sprintf(buffer, "%ld 0x%lx 0x%lx\n", nr, sp, pc);
545
546 return sprintf(buffer,
547 "%ld 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx\n",
548 nr,
549 args[0], args[1], args[2], args[3], args[4], args[5],
550 sp, pc);
551}
552#endif /* CONFIG_HAVE_ARCH_TRACEHOOK */
553
Linus Torvalds1da177e2005-04-16 15:20:36 -0700554/************************************************************************/
555/* Here the fs part begins */
556/************************************************************************/
557
558/* permission checks */
Eric W. Biederman778c1142006-06-26 00:25:58 -0700559static int proc_fd_access_allowed(struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560{
Eric W. Biederman778c1142006-06-26 00:25:58 -0700561 struct task_struct *task;
562 int allowed = 0;
Eric W. Biedermandf26c402006-06-26 00:25:59 -0700563 /* Allow access to a task's file descriptors if it is us or we
564 * may use ptrace attach to the process and find out that
565 * information.
Eric W. Biederman778c1142006-06-26 00:25:58 -0700566 */
567 task = get_proc_task(inode);
Eric W. Biedermandf26c402006-06-26 00:25:59 -0700568 if (task) {
Stephen Smalley006ebb42008-05-19 08:32:49 -0400569 allowed = ptrace_may_access(task, PTRACE_MODE_READ);
Eric W. Biederman778c1142006-06-26 00:25:58 -0700570 put_task_struct(task);
Eric W. Biedermandf26c402006-06-26 00:25:59 -0700571 }
Eric W. Biederman778c1142006-06-26 00:25:58 -0700572 return allowed;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573}
574
Linus Torvalds6d76fa52006-07-15 12:26:45 -0700575static int proc_setattr(struct dentry *dentry, struct iattr *attr)
576{
577 int error;
578 struct inode *inode = dentry->d_inode;
579
580 if (attr->ia_valid & ATTR_MODE)
581 return -EPERM;
582
583 error = inode_change_ok(inode, attr);
John Johansen1e8123f2007-05-08 00:29:41 -0700584 if (!error)
585 error = inode_setattr(inode, attr);
Linus Torvalds6d76fa52006-07-15 12:26:45 -0700586 return error;
587}
588
Arjan van de Venc5ef1c42007-02-12 00:55:40 -0800589static const struct inode_operations proc_def_inode_operations = {
Linus Torvalds6d76fa52006-07-15 12:26:45 -0700590 .setattr = proc_setattr,
591};
592
Miklos Szeredia1a2c402008-03-27 13:06:24 +0100593static int mounts_open_common(struct inode *inode, struct file *file,
594 const struct seq_operations *op)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700595{
Eric W. Biederman99f89552006-06-26 00:25:55 -0700596 struct task_struct *task = get_proc_task(inode);
Pavel Emelyanovcf7b7082007-10-18 23:39:54 -0700597 struct nsproxy *nsp;
Kirill Korotaev6b3286e2006-12-08 02:37:56 -0800598 struct mnt_namespace *ns = NULL;
Miklos Szeredia1a2c402008-03-27 13:06:24 +0100599 struct fs_struct *fs = NULL;
600 struct path root;
Al Viro5addc5d2005-11-07 17:15:49 -0500601 struct proc_mounts *p;
602 int ret = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700603
Eric W. Biederman99f89552006-06-26 00:25:55 -0700604 if (task) {
Pavel Emelyanovcf7b7082007-10-18 23:39:54 -0700605 rcu_read_lock();
606 nsp = task_nsproxy(task);
607 if (nsp) {
608 ns = nsp->mnt_ns;
Alexey Dobriyan863c4702007-01-26 00:56:53 -0800609 if (ns)
610 get_mnt_ns(ns);
611 }
Pavel Emelyanovcf7b7082007-10-18 23:39:54 -0700612 rcu_read_unlock();
Miklos Szeredia1a2c402008-03-27 13:06:24 +0100613 if (ns)
614 fs = get_fs_struct(task);
Eric W. Biederman99f89552006-06-26 00:25:55 -0700615 put_task_struct(task);
616 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700617
Miklos Szeredia1a2c402008-03-27 13:06:24 +0100618 if (!ns)
619 goto err;
620 if (!fs)
621 goto err_put_ns;
622
623 read_lock(&fs->lock);
624 root = fs->root;
625 path_get(&root);
626 read_unlock(&fs->lock);
627 put_fs_struct(fs);
628
629 ret = -ENOMEM;
630 p = kmalloc(sizeof(struct proc_mounts), GFP_KERNEL);
631 if (!p)
632 goto err_put_path;
633
634 file->private_data = &p->m;
635 ret = seq_open(file, op);
636 if (ret)
637 goto err_free;
638
639 p->m.private = p;
640 p->ns = ns;
641 p->root = root;
642 p->event = ns->event;
643
644 return 0;
645
646 err_free:
647 kfree(p);
648 err_put_path:
649 path_put(&root);
650 err_put_ns:
651 put_mnt_ns(ns);
652 err:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700653 return ret;
654}
655
656static int mounts_release(struct inode *inode, struct file *file)
657{
Miklos Szeredia1a2c402008-03-27 13:06:24 +0100658 struct proc_mounts *p = file->private_data;
659 path_put(&p->root);
660 put_mnt_ns(p->ns);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700661 return seq_release(inode, file);
662}
663
Al Viro5addc5d2005-11-07 17:15:49 -0500664static unsigned mounts_poll(struct file *file, poll_table *wait)
665{
666 struct proc_mounts *p = file->private_data;
Miklos Szeredia1a2c402008-03-27 13:06:24 +0100667 struct mnt_namespace *ns = p->ns;
Al Viro5addc5d2005-11-07 17:15:49 -0500668 unsigned res = 0;
669
670 poll_wait(file, &ns->poll, wait);
671
672 spin_lock(&vfsmount_lock);
673 if (p->event != ns->event) {
674 p->event = ns->event;
675 res = POLLERR;
676 }
677 spin_unlock(&vfsmount_lock);
678
679 return res;
680}
681
Miklos Szeredia1a2c402008-03-27 13:06:24 +0100682static int mounts_open(struct inode *inode, struct file *file)
683{
684 return mounts_open_common(inode, file, &mounts_op);
685}
686
Arjan van de Ven00977a52007-02-12 00:55:34 -0800687static const struct file_operations proc_mounts_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700688 .open = mounts_open,
689 .read = seq_read,
690 .llseek = seq_lseek,
691 .release = mounts_release,
Al Viro5addc5d2005-11-07 17:15:49 -0500692 .poll = mounts_poll,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700693};
694
Ram Pai2d4d4862008-03-27 13:06:25 +0100695static int mountinfo_open(struct inode *inode, struct file *file)
696{
697 return mounts_open_common(inode, file, &mountinfo_op);
698}
699
700static const struct file_operations proc_mountinfo_operations = {
701 .open = mountinfo_open,
702 .read = seq_read,
703 .llseek = seq_lseek,
704 .release = mounts_release,
705 .poll = mounts_poll,
706};
707
Chuck Leverb4629fe2006-03-20 13:44:12 -0500708static int mountstats_open(struct inode *inode, struct file *file)
709{
Miklos Szeredia1a2c402008-03-27 13:06:24 +0100710 return mounts_open_common(inode, file, &mountstats_op);
Chuck Leverb4629fe2006-03-20 13:44:12 -0500711}
712
Arjan van de Ven00977a52007-02-12 00:55:34 -0800713static const struct file_operations proc_mountstats_operations = {
Chuck Leverb4629fe2006-03-20 13:44:12 -0500714 .open = mountstats_open,
715 .read = seq_read,
716 .llseek = seq_lseek,
717 .release = mounts_release,
718};
719
Linus Torvalds1da177e2005-04-16 15:20:36 -0700720#define PROC_BLOCK_SIZE (3*1024) /* 4K page size but our output routines use some slack for overruns */
721
722static ssize_t proc_info_read(struct file * file, char __user * buf,
723 size_t count, loff_t *ppos)
724{
Josef "Jeff" Sipek2fddfee2006-12-08 02:36:36 -0800725 struct inode * inode = file->f_path.dentry->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700726 unsigned long page;
727 ssize_t length;
Eric W. Biederman99f89552006-06-26 00:25:55 -0700728 struct task_struct *task = get_proc_task(inode);
729
730 length = -ESRCH;
731 if (!task)
732 goto out_no_task;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700733
734 if (count > PROC_BLOCK_SIZE)
735 count = PROC_BLOCK_SIZE;
Eric W. Biederman99f89552006-06-26 00:25:55 -0700736
737 length = -ENOMEM;
Mel Gormane12ba742007-10-16 01:25:52 -0700738 if (!(page = __get_free_page(GFP_TEMPORARY)))
Eric W. Biederman99f89552006-06-26 00:25:55 -0700739 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700740
741 length = PROC_I(inode)->op.proc_read(task, (char*)page);
742
743 if (length >= 0)
744 length = simple_read_from_buffer(buf, count, ppos, (char *)page, length);
745 free_page(page);
Eric W. Biederman99f89552006-06-26 00:25:55 -0700746out:
747 put_task_struct(task);
748out_no_task:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700749 return length;
750}
751
Arjan van de Ven00977a52007-02-12 00:55:34 -0800752static const struct file_operations proc_info_file_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700753 .read = proc_info_read,
754};
755
Eric W. Biedermanbe614082008-02-08 04:18:30 -0800756static int proc_single_show(struct seq_file *m, void *v)
757{
758 struct inode *inode = m->private;
759 struct pid_namespace *ns;
760 struct pid *pid;
761 struct task_struct *task;
762 int ret;
763
764 ns = inode->i_sb->s_fs_info;
765 pid = proc_pid(inode);
766 task = get_pid_task(pid, PIDTYPE_PID);
767 if (!task)
768 return -ESRCH;
769
770 ret = PROC_I(inode)->op.proc_show(m, ns, pid, task);
771
772 put_task_struct(task);
773 return ret;
774}
775
776static int proc_single_open(struct inode *inode, struct file *filp)
777{
778 int ret;
779 ret = single_open(filp, proc_single_show, NULL);
780 if (!ret) {
781 struct seq_file *m = filp->private_data;
782
783 m->private = inode;
784 }
785 return ret;
786}
787
788static const struct file_operations proc_single_file_operations = {
789 .open = proc_single_open,
790 .read = seq_read,
791 .llseek = seq_lseek,
792 .release = single_release,
793};
794
Linus Torvalds1da177e2005-04-16 15:20:36 -0700795static int mem_open(struct inode* inode, struct file* file)
796{
797 file->private_data = (void*)((long)current->self_exec_id);
798 return 0;
799}
800
801static ssize_t mem_read(struct file * file, char __user * buf,
802 size_t count, loff_t *ppos)
803{
Josef "Jeff" Sipek2fddfee2006-12-08 02:36:36 -0800804 struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700805 char *page;
806 unsigned long src = *ppos;
807 int ret = -ESRCH;
808 struct mm_struct *mm;
809
Eric W. Biederman99f89552006-06-26 00:25:55 -0700810 if (!task)
811 goto out_no_task;
812
Roland McGrath638fa202008-04-29 01:01:38 -0700813 if (check_mem_permission(task))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700814 goto out;
815
816 ret = -ENOMEM;
Mel Gormane12ba742007-10-16 01:25:52 -0700817 page = (char *)__get_free_page(GFP_TEMPORARY);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700818 if (!page)
819 goto out;
820
821 ret = 0;
822
823 mm = get_task_mm(task);
824 if (!mm)
825 goto out_free;
826
827 ret = -EIO;
828
829 if (file->private_data != (void*)((long)current->self_exec_id))
830 goto out_put;
831
832 ret = 0;
833
834 while (count > 0) {
835 int this_len, retval;
836
837 this_len = (count > PAGE_SIZE) ? PAGE_SIZE : count;
838 retval = access_process_vm(task, src, page, this_len, 0);
Roland McGrath638fa202008-04-29 01:01:38 -0700839 if (!retval || check_mem_permission(task)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700840 if (!ret)
841 ret = -EIO;
842 break;
843 }
844
845 if (copy_to_user(buf, page, retval)) {
846 ret = -EFAULT;
847 break;
848 }
849
850 ret += retval;
851 src += retval;
852 buf += retval;
853 count -= retval;
854 }
855 *ppos = src;
856
857out_put:
858 mmput(mm);
859out_free:
860 free_page((unsigned long) page);
861out:
Eric W. Biederman99f89552006-06-26 00:25:55 -0700862 put_task_struct(task);
863out_no_task:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700864 return ret;
865}
866
867#define mem_write NULL
868
869#ifndef mem_write
870/* This is a security hazard */
Glauber de Oliveira Costa63967fa2007-02-20 13:58:12 -0800871static ssize_t mem_write(struct file * file, const char __user *buf,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700872 size_t count, loff_t *ppos)
873{
Frederik Deweerdtf7ca54f2006-09-29 02:01:02 -0700874 int copied;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700875 char *page;
Josef "Jeff" Sipek2fddfee2006-12-08 02:36:36 -0800876 struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700877 unsigned long dst = *ppos;
878
Eric W. Biederman99f89552006-06-26 00:25:55 -0700879 copied = -ESRCH;
880 if (!task)
881 goto out_no_task;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700882
Roland McGrath638fa202008-04-29 01:01:38 -0700883 if (check_mem_permission(task))
Eric W. Biederman99f89552006-06-26 00:25:55 -0700884 goto out;
885
886 copied = -ENOMEM;
Mel Gormane12ba742007-10-16 01:25:52 -0700887 page = (char *)__get_free_page(GFP_TEMPORARY);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700888 if (!page)
Eric W. Biederman99f89552006-06-26 00:25:55 -0700889 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700890
Frederik Deweerdtf7ca54f2006-09-29 02:01:02 -0700891 copied = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700892 while (count > 0) {
893 int this_len, retval;
894
895 this_len = (count > PAGE_SIZE) ? PAGE_SIZE : count;
896 if (copy_from_user(page, buf, this_len)) {
897 copied = -EFAULT;
898 break;
899 }
900 retval = access_process_vm(task, dst, page, this_len, 1);
901 if (!retval) {
902 if (!copied)
903 copied = -EIO;
904 break;
905 }
906 copied += retval;
907 buf += retval;
908 dst += retval;
909 count -= retval;
910 }
911 *ppos = dst;
912 free_page((unsigned long) page);
Eric W. Biederman99f89552006-06-26 00:25:55 -0700913out:
914 put_task_struct(task);
915out_no_task:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700916 return copied;
917}
918#endif
919
Matt Mackall85863e42008-02-04 22:29:04 -0800920loff_t mem_lseek(struct file *file, loff_t offset, int orig)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700921{
922 switch (orig) {
923 case 0:
924 file->f_pos = offset;
925 break;
926 case 1:
927 file->f_pos += offset;
928 break;
929 default:
930 return -EINVAL;
931 }
932 force_successful_syscall_return();
933 return file->f_pos;
934}
935
Arjan van de Ven00977a52007-02-12 00:55:34 -0800936static const struct file_operations proc_mem_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700937 .llseek = mem_lseek,
938 .read = mem_read,
939 .write = mem_write,
940 .open = mem_open,
941};
942
James Pearson315e28c2007-10-16 23:30:17 -0700943static ssize_t environ_read(struct file *file, char __user *buf,
944 size_t count, loff_t *ppos)
945{
946 struct task_struct *task = get_proc_task(file->f_dentry->d_inode);
947 char *page;
948 unsigned long src = *ppos;
949 int ret = -ESRCH;
950 struct mm_struct *mm;
951
952 if (!task)
953 goto out_no_task;
954
Stephen Smalley006ebb42008-05-19 08:32:49 -0400955 if (!ptrace_may_access(task, PTRACE_MODE_READ))
James Pearson315e28c2007-10-16 23:30:17 -0700956 goto out;
957
958 ret = -ENOMEM;
959 page = (char *)__get_free_page(GFP_TEMPORARY);
960 if (!page)
961 goto out;
962
963 ret = 0;
964
965 mm = get_task_mm(task);
966 if (!mm)
967 goto out_free;
968
969 while (count > 0) {
970 int this_len, retval, max_len;
971
972 this_len = mm->env_end - (mm->env_start + src);
973
974 if (this_len <= 0)
975 break;
976
977 max_len = (count > PAGE_SIZE) ? PAGE_SIZE : count;
978 this_len = (this_len > max_len) ? max_len : this_len;
979
980 retval = access_process_vm(task, (mm->env_start + src),
981 page, this_len, 0);
982
983 if (retval <= 0) {
984 ret = retval;
985 break;
986 }
987
988 if (copy_to_user(buf, page, retval)) {
989 ret = -EFAULT;
990 break;
991 }
992
993 ret += retval;
994 src += retval;
995 buf += retval;
996 count -= retval;
997 }
998 *ppos = src;
999
1000 mmput(mm);
1001out_free:
1002 free_page((unsigned long) page);
1003out:
1004 put_task_struct(task);
1005out_no_task:
1006 return ret;
1007}
1008
1009static const struct file_operations proc_environ_operations = {
1010 .read = environ_read,
1011};
1012
Linus Torvalds1da177e2005-04-16 15:20:36 -07001013static ssize_t oom_adjust_read(struct file *file, char __user *buf,
1014 size_t count, loff_t *ppos)
1015{
Josef "Jeff" Sipek2fddfee2006-12-08 02:36:36 -08001016 struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode);
Eric W. Biederman8578cea2006-06-26 00:25:54 -07001017 char buffer[PROC_NUMBUF];
Linus Torvalds1da177e2005-04-16 15:20:36 -07001018 size_t len;
Eric W. Biederman99f89552006-06-26 00:25:55 -07001019 int oom_adjust;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001020
Eric W. Biederman99f89552006-06-26 00:25:55 -07001021 if (!task)
1022 return -ESRCH;
1023 oom_adjust = task->oomkilladj;
1024 put_task_struct(task);
1025
Eric W. Biederman8578cea2006-06-26 00:25:54 -07001026 len = snprintf(buffer, sizeof(buffer), "%i\n", oom_adjust);
Akinobu Mita0c28f282007-05-08 00:31:41 -07001027
1028 return simple_read_from_buffer(buf, count, ppos, buffer, len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001029}
1030
1031static ssize_t oom_adjust_write(struct file *file, const char __user *buf,
1032 size_t count, loff_t *ppos)
1033{
Eric W. Biederman99f89552006-06-26 00:25:55 -07001034 struct task_struct *task;
Eric W. Biederman8578cea2006-06-26 00:25:54 -07001035 char buffer[PROC_NUMBUF], *end;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001036 int oom_adjust;
1037
Eric W. Biederman8578cea2006-06-26 00:25:54 -07001038 memset(buffer, 0, sizeof(buffer));
1039 if (count > sizeof(buffer) - 1)
1040 count = sizeof(buffer) - 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001041 if (copy_from_user(buffer, buf, count))
1042 return -EFAULT;
1043 oom_adjust = simple_strtol(buffer, &end, 0);
Alexey Dobriyan8ac773b2006-10-19 23:28:32 -07001044 if ((oom_adjust < OOM_ADJUST_MIN || oom_adjust > OOM_ADJUST_MAX) &&
1045 oom_adjust != OOM_DISABLE)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001046 return -EINVAL;
1047 if (*end == '\n')
1048 end++;
Josef "Jeff" Sipek2fddfee2006-12-08 02:36:36 -08001049 task = get_proc_task(file->f_path.dentry->d_inode);
Eric W. Biederman99f89552006-06-26 00:25:55 -07001050 if (!task)
1051 return -ESRCH;
Guillem Jover8fb4fc62006-12-06 20:32:24 -08001052 if (oom_adjust < task->oomkilladj && !capable(CAP_SYS_RESOURCE)) {
1053 put_task_struct(task);
1054 return -EACCES;
1055 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001056 task->oomkilladj = oom_adjust;
Eric W. Biederman99f89552006-06-26 00:25:55 -07001057 put_task_struct(task);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001058 if (end - buffer == 0)
1059 return -EIO;
1060 return end - buffer;
1061}
1062
Arjan van de Ven00977a52007-02-12 00:55:34 -08001063static const struct file_operations proc_oom_adjust_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001064 .read = oom_adjust_read,
1065 .write = oom_adjust_write,
1066};
1067
Linus Torvalds1da177e2005-04-16 15:20:36 -07001068#ifdef CONFIG_AUDITSYSCALL
1069#define TMPBUFLEN 21
1070static ssize_t proc_loginuid_read(struct file * file, char __user * buf,
1071 size_t count, loff_t *ppos)
1072{
Josef "Jeff" Sipek2fddfee2006-12-08 02:36:36 -08001073 struct inode * inode = file->f_path.dentry->d_inode;
Eric W. Biederman99f89552006-06-26 00:25:55 -07001074 struct task_struct *task = get_proc_task(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001075 ssize_t length;
1076 char tmpbuf[TMPBUFLEN];
1077
Eric W. Biederman99f89552006-06-26 00:25:55 -07001078 if (!task)
1079 return -ESRCH;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001080 length = scnprintf(tmpbuf, TMPBUFLEN, "%u",
Al Viro0c11b942008-01-10 04:20:52 -05001081 audit_get_loginuid(task));
Eric W. Biederman99f89552006-06-26 00:25:55 -07001082 put_task_struct(task);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001083 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1084}
1085
1086static ssize_t proc_loginuid_write(struct file * file, const char __user * buf,
1087 size_t count, loff_t *ppos)
1088{
Josef "Jeff" Sipek2fddfee2006-12-08 02:36:36 -08001089 struct inode * inode = file->f_path.dentry->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001090 char *page, *tmp;
1091 ssize_t length;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001092 uid_t loginuid;
1093
1094 if (!capable(CAP_AUDIT_CONTROL))
1095 return -EPERM;
1096
Eric W. Biederman13b41b02006-06-26 00:25:56 -07001097 if (current != pid_task(proc_pid(inode), PIDTYPE_PID))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001098 return -EPERM;
1099
Al Viroe0182902006-05-18 08:28:02 -04001100 if (count >= PAGE_SIZE)
1101 count = PAGE_SIZE - 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001102
1103 if (*ppos != 0) {
1104 /* No partial writes. */
1105 return -EINVAL;
1106 }
Mel Gormane12ba742007-10-16 01:25:52 -07001107 page = (char*)__get_free_page(GFP_TEMPORARY);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001108 if (!page)
1109 return -ENOMEM;
1110 length = -EFAULT;
1111 if (copy_from_user(page, buf, count))
1112 goto out_free_page;
1113
Al Viroe0182902006-05-18 08:28:02 -04001114 page[count] = '\0';
Linus Torvalds1da177e2005-04-16 15:20:36 -07001115 loginuid = simple_strtoul(page, &tmp, 10);
1116 if (tmp == page) {
1117 length = -EINVAL;
1118 goto out_free_page;
1119
1120 }
Eric W. Biederman99f89552006-06-26 00:25:55 -07001121 length = audit_set_loginuid(current, loginuid);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001122 if (likely(length == 0))
1123 length = count;
1124
1125out_free_page:
1126 free_page((unsigned long) page);
1127 return length;
1128}
1129
Arjan van de Ven00977a52007-02-12 00:55:34 -08001130static const struct file_operations proc_loginuid_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001131 .read = proc_loginuid_read,
1132 .write = proc_loginuid_write,
1133};
Eric Paris1e0bd752008-03-13 08:15:31 -04001134
1135static ssize_t proc_sessionid_read(struct file * file, char __user * buf,
1136 size_t count, loff_t *ppos)
1137{
1138 struct inode * inode = file->f_path.dentry->d_inode;
1139 struct task_struct *task = get_proc_task(inode);
1140 ssize_t length;
1141 char tmpbuf[TMPBUFLEN];
1142
1143 if (!task)
1144 return -ESRCH;
1145 length = scnprintf(tmpbuf, TMPBUFLEN, "%u",
1146 audit_get_sessionid(task));
1147 put_task_struct(task);
1148 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1149}
1150
1151static const struct file_operations proc_sessionid_operations = {
1152 .read = proc_sessionid_read,
1153};
Linus Torvalds1da177e2005-04-16 15:20:36 -07001154#endif
1155
Akinobu Mitaf4f154f2006-12-08 02:39:47 -08001156#ifdef CONFIG_FAULT_INJECTION
1157static ssize_t proc_fault_inject_read(struct file * file, char __user * buf,
1158 size_t count, loff_t *ppos)
1159{
1160 struct task_struct *task = get_proc_task(file->f_dentry->d_inode);
1161 char buffer[PROC_NUMBUF];
1162 size_t len;
1163 int make_it_fail;
Akinobu Mitaf4f154f2006-12-08 02:39:47 -08001164
1165 if (!task)
1166 return -ESRCH;
1167 make_it_fail = task->make_it_fail;
1168 put_task_struct(task);
1169
1170 len = snprintf(buffer, sizeof(buffer), "%i\n", make_it_fail);
Akinobu Mita0c28f282007-05-08 00:31:41 -07001171
1172 return simple_read_from_buffer(buf, count, ppos, buffer, len);
Akinobu Mitaf4f154f2006-12-08 02:39:47 -08001173}
1174
1175static ssize_t proc_fault_inject_write(struct file * file,
1176 const char __user * buf, size_t count, loff_t *ppos)
1177{
1178 struct task_struct *task;
1179 char buffer[PROC_NUMBUF], *end;
1180 int make_it_fail;
1181
1182 if (!capable(CAP_SYS_RESOURCE))
1183 return -EPERM;
1184 memset(buffer, 0, sizeof(buffer));
1185 if (count > sizeof(buffer) - 1)
1186 count = sizeof(buffer) - 1;
1187 if (copy_from_user(buffer, buf, count))
1188 return -EFAULT;
1189 make_it_fail = simple_strtol(buffer, &end, 0);
1190 if (*end == '\n')
1191 end++;
1192 task = get_proc_task(file->f_dentry->d_inode);
1193 if (!task)
1194 return -ESRCH;
1195 task->make_it_fail = make_it_fail;
1196 put_task_struct(task);
1197 if (end - buffer == 0)
1198 return -EIO;
1199 return end - buffer;
1200}
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
Matt Helsley925d1c42008-04-29 01:01:36 -07001268/*
1269 * We added or removed a vma mapping the executable. The vmas are only mapped
1270 * during exec and are not mapped with the mmap system call.
1271 * Callers must hold down_write() on the mm's mmap_sem for these
1272 */
1273void added_exe_file_vma(struct mm_struct *mm)
1274{
1275 mm->num_exe_file_vmas++;
1276}
1277
1278void removed_exe_file_vma(struct mm_struct *mm)
1279{
1280 mm->num_exe_file_vmas--;
1281 if ((mm->num_exe_file_vmas == 0) && mm->exe_file){
1282 fput(mm->exe_file);
1283 mm->exe_file = NULL;
1284 }
1285
1286}
1287
1288void set_mm_exe_file(struct mm_struct *mm, struct file *new_exe_file)
1289{
1290 if (new_exe_file)
1291 get_file(new_exe_file);
1292 if (mm->exe_file)
1293 fput(mm->exe_file);
1294 mm->exe_file = new_exe_file;
1295 mm->num_exe_file_vmas = 0;
1296}
1297
1298struct file *get_mm_exe_file(struct mm_struct *mm)
1299{
1300 struct file *exe_file;
1301
1302 /* We need mmap_sem to protect against races with removal of
1303 * VM_EXECUTABLE vmas */
1304 down_read(&mm->mmap_sem);
1305 exe_file = mm->exe_file;
1306 if (exe_file)
1307 get_file(exe_file);
1308 up_read(&mm->mmap_sem);
1309 return exe_file;
1310}
1311
1312void dup_mm_exe_file(struct mm_struct *oldmm, struct mm_struct *newmm)
1313{
1314 /* It's safe to write the exe_file pointer without exe_file_lock because
1315 * this is called during fork when the task is not yet in /proc */
1316 newmm->exe_file = get_mm_exe_file(oldmm);
1317}
1318
1319static int proc_exe_link(struct inode *inode, struct path *exe_path)
1320{
1321 struct task_struct *task;
1322 struct mm_struct *mm;
1323 struct file *exe_file;
1324
1325 task = get_proc_task(inode);
1326 if (!task)
1327 return -ENOENT;
1328 mm = get_task_mm(task);
1329 put_task_struct(task);
1330 if (!mm)
1331 return -ENOENT;
1332 exe_file = get_mm_exe_file(mm);
1333 mmput(mm);
1334 if (exe_file) {
1335 *exe_path = exe_file->f_path;
1336 path_get(&exe_file->f_path);
1337 fput(exe_file);
1338 return 0;
1339 } else
1340 return -ENOENT;
1341}
1342
Al Viro008b1502005-08-20 00:17:39 +01001343static void *proc_pid_follow_link(struct dentry *dentry, struct nameidata *nd)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001344{
1345 struct inode *inode = dentry->d_inode;
1346 int error = -EACCES;
1347
1348 /* We don't need a base pointer in the /proc filesystem */
Jan Blunck1d957f92008-02-14 19:34:35 -08001349 path_put(&nd->path);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001350
Eric W. Biederman778c1142006-06-26 00:25:58 -07001351 /* Are we allowed to snoop on the tasks file descriptors? */
1352 if (!proc_fd_access_allowed(inode))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001353 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001354
Jan Blunck3dcd25f2008-02-14 19:38:35 -08001355 error = PROC_I(inode)->op.proc_get_link(inode, &nd->path);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001356 nd->last_type = LAST_BIND;
1357out:
Al Viro008b1502005-08-20 00:17:39 +01001358 return ERR_PTR(error);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001359}
1360
Jan Blunck3dcd25f2008-02-14 19:38:35 -08001361static int do_proc_readlink(struct path *path, char __user *buffer, int buflen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001362{
Mel Gormane12ba742007-10-16 01:25:52 -07001363 char *tmp = (char*)__get_free_page(GFP_TEMPORARY);
Jan Blunck3dcd25f2008-02-14 19:38:35 -08001364 char *pathname;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001365 int len;
1366
1367 if (!tmp)
1368 return -ENOMEM;
Akinobu Mita0c28f282007-05-08 00:31:41 -07001369
Jan Blunckcf28b482008-02-14 19:38:44 -08001370 pathname = d_path(path, tmp, PAGE_SIZE);
Jan Blunck3dcd25f2008-02-14 19:38:35 -08001371 len = PTR_ERR(pathname);
1372 if (IS_ERR(pathname))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001373 goto out;
Jan Blunck3dcd25f2008-02-14 19:38:35 -08001374 len = tmp + PAGE_SIZE - 1 - pathname;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001375
1376 if (len > buflen)
1377 len = buflen;
Jan Blunck3dcd25f2008-02-14 19:38:35 -08001378 if (copy_to_user(buffer, pathname, len))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001379 len = -EFAULT;
1380 out:
1381 free_page((unsigned long)tmp);
1382 return len;
1383}
1384
1385static int proc_pid_readlink(struct dentry * dentry, char __user * buffer, int buflen)
1386{
1387 int error = -EACCES;
1388 struct inode *inode = dentry->d_inode;
Jan Blunck3dcd25f2008-02-14 19:38:35 -08001389 struct path path;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001390
Eric W. Biederman778c1142006-06-26 00:25:58 -07001391 /* Are we allowed to snoop on the tasks file descriptors? */
1392 if (!proc_fd_access_allowed(inode))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001393 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001394
Jan Blunck3dcd25f2008-02-14 19:38:35 -08001395 error = PROC_I(inode)->op.proc_get_link(inode, &path);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001396 if (error)
1397 goto out;
1398
Jan Blunck3dcd25f2008-02-14 19:38:35 -08001399 error = do_proc_readlink(&path, buffer, buflen);
1400 path_put(&path);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001401out:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001402 return error;
1403}
1404
Arjan van de Venc5ef1c42007-02-12 00:55:40 -08001405static const struct inode_operations proc_pid_link_inode_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001406 .readlink = proc_pid_readlink,
Linus Torvalds6d76fa52006-07-15 12:26:45 -07001407 .follow_link = proc_pid_follow_link,
1408 .setattr = proc_setattr,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001409};
1410
Eric W. Biederman28a6d672006-10-02 02:17:05 -07001411
1412/* building an inode */
1413
1414static int task_dumpable(struct task_struct *task)
1415{
1416 int dumpable = 0;
1417 struct mm_struct *mm;
1418
1419 task_lock(task);
1420 mm = task->mm;
1421 if (mm)
Kawai, Hidehiro6c5d5232007-07-19 01:48:27 -07001422 dumpable = get_dumpable(mm);
Eric W. Biederman28a6d672006-10-02 02:17:05 -07001423 task_unlock(task);
1424 if(dumpable == 1)
1425 return 1;
1426 return 0;
1427}
1428
1429
Eric W. Biederman61a28782006-10-02 02:18:49 -07001430static struct inode *proc_pid_make_inode(struct super_block * sb, struct task_struct *task)
Eric W. Biederman28a6d672006-10-02 02:17:05 -07001431{
1432 struct inode * inode;
1433 struct proc_inode *ei;
David Howellsc69e8d92008-11-14 10:39:19 +11001434 const struct cred *cred;
Eric W. Biederman28a6d672006-10-02 02:17:05 -07001435
1436 /* We need a new inode */
1437
1438 inode = new_inode(sb);
1439 if (!inode)
1440 goto out;
1441
1442 /* Common stuff */
1443 ei = PROC_I(inode);
1444 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
Eric W. Biederman28a6d672006-10-02 02:17:05 -07001445 inode->i_op = &proc_def_inode_operations;
1446
1447 /*
1448 * grab the reference to task.
1449 */
Oleg Nesterov1a657f72006-10-02 02:18:59 -07001450 ei->pid = get_task_pid(task, PIDTYPE_PID);
Eric W. Biederman28a6d672006-10-02 02:17:05 -07001451 if (!ei->pid)
1452 goto out_unlock;
1453
Eric W. Biederman28a6d672006-10-02 02:17:05 -07001454 if (task_dumpable(task)) {
David Howellsc69e8d92008-11-14 10:39:19 +11001455 rcu_read_lock();
1456 cred = __task_cred(task);
1457 inode->i_uid = cred->euid;
1458 inode->i_gid = cred->egid;
1459 rcu_read_unlock();
Eric W. Biederman28a6d672006-10-02 02:17:05 -07001460 }
1461 security_task_to_inode(task, inode);
1462
1463out:
1464 return inode;
1465
1466out_unlock:
1467 iput(inode);
1468 return NULL;
1469}
1470
1471static int pid_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
1472{
1473 struct inode *inode = dentry->d_inode;
1474 struct task_struct *task;
David Howellsc69e8d92008-11-14 10:39:19 +11001475 const struct cred *cred;
1476
Eric W. Biederman28a6d672006-10-02 02:17:05 -07001477 generic_fillattr(inode, stat);
1478
1479 rcu_read_lock();
1480 stat->uid = 0;
1481 stat->gid = 0;
1482 task = pid_task(proc_pid(inode), PIDTYPE_PID);
1483 if (task) {
1484 if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) ||
1485 task_dumpable(task)) {
David Howellsc69e8d92008-11-14 10:39:19 +11001486 cred = __task_cred(task);
1487 stat->uid = cred->euid;
1488 stat->gid = cred->egid;
Eric W. Biederman28a6d672006-10-02 02:17:05 -07001489 }
1490 }
1491 rcu_read_unlock();
1492 return 0;
1493}
1494
1495/* dentry stuff */
1496
1497/*
1498 * Exceptional case: normally we are not allowed to unhash a busy
1499 * directory. In this case, however, we can do it - no aliasing problems
1500 * due to the way we treat inodes.
1501 *
1502 * Rewrite the inode's ownerships here because the owning task may have
1503 * performed a setuid(), etc.
1504 *
1505 * Before the /proc/pid/status file was created the only way to read
1506 * the effective uid of a /process was to stat /proc/pid. Reading
1507 * /proc/pid/status is slow enough that procps and other packages
1508 * kept stating /proc/pid. To keep the rules in /proc simple I have
1509 * made this apply to all per process world readable and executable
1510 * directories.
1511 */
1512static int pid_revalidate(struct dentry *dentry, struct nameidata *nd)
1513{
1514 struct inode *inode = dentry->d_inode;
1515 struct task_struct *task = get_proc_task(inode);
David Howellsc69e8d92008-11-14 10:39:19 +11001516 const struct cred *cred;
1517
Eric W. Biederman28a6d672006-10-02 02:17:05 -07001518 if (task) {
1519 if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) ||
1520 task_dumpable(task)) {
David Howellsc69e8d92008-11-14 10:39:19 +11001521 rcu_read_lock();
1522 cred = __task_cred(task);
1523 inode->i_uid = cred->euid;
1524 inode->i_gid = cred->egid;
1525 rcu_read_unlock();
Eric W. Biederman28a6d672006-10-02 02:17:05 -07001526 } else {
1527 inode->i_uid = 0;
1528 inode->i_gid = 0;
1529 }
1530 inode->i_mode &= ~(S_ISUID | S_ISGID);
1531 security_task_to_inode(task, inode);
1532 put_task_struct(task);
1533 return 1;
1534 }
1535 d_drop(dentry);
1536 return 0;
1537}
1538
1539static int pid_delete_dentry(struct dentry * dentry)
1540{
1541 /* Is the task we represent dead?
1542 * If so, then don't put the dentry on the lru list,
1543 * kill it immediately.
1544 */
1545 return !proc_pid(dentry->d_inode)->tasks[PIDTYPE_PID].first;
1546}
1547
1548static struct dentry_operations pid_dentry_operations =
1549{
1550 .d_revalidate = pid_revalidate,
1551 .d_delete = pid_delete_dentry,
1552};
1553
1554/* Lookups */
1555
Eric Dumazetc5141e62007-05-08 00:26:15 -07001556typedef struct dentry *instantiate_t(struct inode *, struct dentry *,
1557 struct task_struct *, const void *);
Eric W. Biederman61a28782006-10-02 02:18:49 -07001558
Eric W. Biederman1c0d04c2006-10-02 02:18:57 -07001559/*
1560 * Fill a directory entry.
1561 *
1562 * If possible create the dcache entry and derive our inode number and
1563 * file type from dcache entry.
1564 *
1565 * Since all of the proc inode numbers are dynamically generated, the inode
1566 * numbers do not exist until the inode is cache. This means creating the
1567 * the dcache entry in readdir is necessary to keep the inode numbers
1568 * reported by readdir in sync with the inode numbers reported
1569 * by stat.
1570 */
Eric W. Biederman61a28782006-10-02 02:18:49 -07001571static int proc_fill_cache(struct file *filp, void *dirent, filldir_t filldir,
1572 char *name, int len,
Eric Dumazetc5141e62007-05-08 00:26:15 -07001573 instantiate_t instantiate, struct task_struct *task, const void *ptr)
Eric W. Biederman61a28782006-10-02 02:18:49 -07001574{
Josef "Jeff" Sipek2fddfee2006-12-08 02:36:36 -08001575 struct dentry *child, *dir = filp->f_path.dentry;
Eric W. Biederman61a28782006-10-02 02:18:49 -07001576 struct inode *inode;
1577 struct qstr qname;
1578 ino_t ino = 0;
1579 unsigned type = DT_UNKNOWN;
1580
1581 qname.name = name;
1582 qname.len = len;
1583 qname.hash = full_name_hash(name, len);
1584
1585 child = d_lookup(dir, &qname);
1586 if (!child) {
1587 struct dentry *new;
1588 new = d_alloc(dir, &qname);
1589 if (new) {
1590 child = instantiate(dir->d_inode, new, task, ptr);
1591 if (child)
1592 dput(new);
1593 else
1594 child = new;
1595 }
1596 }
1597 if (!child || IS_ERR(child) || !child->d_inode)
1598 goto end_instantiate;
1599 inode = child->d_inode;
1600 if (inode) {
1601 ino = inode->i_ino;
1602 type = inode->i_mode >> 12;
1603 }
1604 dput(child);
1605end_instantiate:
1606 if (!ino)
1607 ino = find_inode_number(dir, &qname);
1608 if (!ino)
1609 ino = 1;
1610 return filldir(dirent, name, len, filp->f_pos, ino, type);
1611}
1612
Eric W. Biederman28a6d672006-10-02 02:17:05 -07001613static unsigned name_to_int(struct dentry *dentry)
1614{
1615 const char *name = dentry->d_name.name;
1616 int len = dentry->d_name.len;
1617 unsigned n = 0;
1618
1619 if (len > 1 && *name == '0')
1620 goto out;
1621 while (len-- > 0) {
1622 unsigned c = *name++ - '0';
1623 if (c > 9)
1624 goto out;
1625 if (n >= (~0U-9)/10)
1626 goto out;
1627 n *= 10;
1628 n += c;
1629 }
1630 return n;
1631out:
1632 return ~0U;
1633}
1634
Miklos Szeredi27932742007-05-08 00:26:17 -07001635#define PROC_FDINFO_MAX 64
1636
Jan Blunck3dcd25f2008-02-14 19:38:35 -08001637static int proc_fd_info(struct inode *inode, struct path *path, char *info)
Eric W. Biederman28a6d672006-10-02 02:17:05 -07001638{
1639 struct task_struct *task = get_proc_task(inode);
1640 struct files_struct *files = NULL;
1641 struct file *file;
1642 int fd = proc_fd(inode);
1643
1644 if (task) {
1645 files = get_files_struct(task);
1646 put_task_struct(task);
1647 }
1648 if (files) {
1649 /*
1650 * We are not taking a ref to the file structure, so we must
1651 * hold ->file_lock.
1652 */
1653 spin_lock(&files->file_lock);
1654 file = fcheck_files(files, fd);
1655 if (file) {
Jan Blunck3dcd25f2008-02-14 19:38:35 -08001656 if (path) {
1657 *path = file->f_path;
1658 path_get(&file->f_path);
1659 }
Miklos Szeredi27932742007-05-08 00:26:17 -07001660 if (info)
1661 snprintf(info, PROC_FDINFO_MAX,
1662 "pos:\t%lli\n"
1663 "flags:\t0%o\n",
1664 (long long) file->f_pos,
1665 file->f_flags);
Eric W. Biederman28a6d672006-10-02 02:17:05 -07001666 spin_unlock(&files->file_lock);
1667 put_files_struct(files);
1668 return 0;
1669 }
1670 spin_unlock(&files->file_lock);
1671 put_files_struct(files);
1672 }
1673 return -ENOENT;
1674}
1675
Jan Blunck3dcd25f2008-02-14 19:38:35 -08001676static int proc_fd_link(struct inode *inode, struct path *path)
Miklos Szeredi27932742007-05-08 00:26:17 -07001677{
Jan Blunck3dcd25f2008-02-14 19:38:35 -08001678 return proc_fd_info(inode, path, NULL);
Miklos Szeredi27932742007-05-08 00:26:17 -07001679}
1680
Eric W. Biederman28a6d672006-10-02 02:17:05 -07001681static int tid_fd_revalidate(struct dentry *dentry, struct nameidata *nd)
1682{
1683 struct inode *inode = dentry->d_inode;
1684 struct task_struct *task = get_proc_task(inode);
1685 int fd = proc_fd(inode);
1686 struct files_struct *files;
David Howellsc69e8d92008-11-14 10:39:19 +11001687 const struct cred *cred;
Eric W. Biederman28a6d672006-10-02 02:17:05 -07001688
1689 if (task) {
1690 files = get_files_struct(task);
1691 if (files) {
1692 rcu_read_lock();
1693 if (fcheck_files(files, fd)) {
1694 rcu_read_unlock();
1695 put_files_struct(files);
1696 if (task_dumpable(task)) {
David Howellsc69e8d92008-11-14 10:39:19 +11001697 rcu_read_lock();
1698 cred = __task_cred(task);
1699 inode->i_uid = cred->euid;
1700 inode->i_gid = cred->egid;
1701 rcu_read_unlock();
Eric W. Biederman28a6d672006-10-02 02:17:05 -07001702 } else {
1703 inode->i_uid = 0;
1704 inode->i_gid = 0;
1705 }
1706 inode->i_mode &= ~(S_ISUID | S_ISGID);
1707 security_task_to_inode(task, inode);
1708 put_task_struct(task);
1709 return 1;
1710 }
1711 rcu_read_unlock();
1712 put_files_struct(files);
1713 }
1714 put_task_struct(task);
1715 }
1716 d_drop(dentry);
1717 return 0;
1718}
1719
1720static struct dentry_operations tid_fd_dentry_operations =
1721{
1722 .d_revalidate = tid_fd_revalidate,
1723 .d_delete = pid_delete_dentry,
1724};
1725
Eric W. Biederman444ceed2006-10-02 02:18:49 -07001726static struct dentry *proc_fd_instantiate(struct inode *dir,
Eric Dumazetc5141e62007-05-08 00:26:15 -07001727 struct dentry *dentry, struct task_struct *task, const void *ptr)
Eric W. Biederman28a6d672006-10-02 02:17:05 -07001728{
Eric Dumazetc5141e62007-05-08 00:26:15 -07001729 unsigned fd = *(const unsigned *)ptr;
Eric W. Biederman444ceed2006-10-02 02:18:49 -07001730 struct file *file;
1731 struct files_struct *files;
1732 struct inode *inode;
1733 struct proc_inode *ei;
1734 struct dentry *error = ERR_PTR(-ENOENT);
Eric W. Biederman28a6d672006-10-02 02:17:05 -07001735
Eric W. Biederman61a28782006-10-02 02:18:49 -07001736 inode = proc_pid_make_inode(dir->i_sb, task);
Eric W. Biederman28a6d672006-10-02 02:17:05 -07001737 if (!inode)
1738 goto out;
1739 ei = PROC_I(inode);
1740 ei->fd = fd;
1741 files = get_files_struct(task);
1742 if (!files)
Eric W. Biederman444ceed2006-10-02 02:18:49 -07001743 goto out_iput;
Eric W. Biederman28a6d672006-10-02 02:17:05 -07001744 inode->i_mode = S_IFLNK;
1745
1746 /*
1747 * We are not taking a ref to the file structure, so we must
1748 * hold ->file_lock.
1749 */
1750 spin_lock(&files->file_lock);
1751 file = fcheck_files(files, fd);
1752 if (!file)
Eric W. Biederman444ceed2006-10-02 02:18:49 -07001753 goto out_unlock;
Al Viroaeb5d722008-09-02 15:28:45 -04001754 if (file->f_mode & FMODE_READ)
Eric W. Biederman28a6d672006-10-02 02:17:05 -07001755 inode->i_mode |= S_IRUSR | S_IXUSR;
Al Viroaeb5d722008-09-02 15:28:45 -04001756 if (file->f_mode & FMODE_WRITE)
Eric W. Biederman28a6d672006-10-02 02:17:05 -07001757 inode->i_mode |= S_IWUSR | S_IXUSR;
1758 spin_unlock(&files->file_lock);
1759 put_files_struct(files);
Eric W. Biederman444ceed2006-10-02 02:18:49 -07001760
Eric W. Biederman28a6d672006-10-02 02:17:05 -07001761 inode->i_op = &proc_pid_link_inode_operations;
1762 inode->i_size = 64;
1763 ei->op.proc_get_link = proc_fd_link;
1764 dentry->d_op = &tid_fd_dentry_operations;
1765 d_add(dentry, inode);
1766 /* Close the race of the process dying before we return the dentry */
1767 if (tid_fd_revalidate(dentry, NULL))
Eric W. Biederman444ceed2006-10-02 02:18:49 -07001768 error = NULL;
1769
1770 out:
1771 return error;
1772out_unlock:
1773 spin_unlock(&files->file_lock);
1774 put_files_struct(files);
1775out_iput:
1776 iput(inode);
1777 goto out;
1778}
1779
Miklos Szeredi27932742007-05-08 00:26:17 -07001780static struct dentry *proc_lookupfd_common(struct inode *dir,
1781 struct dentry *dentry,
1782 instantiate_t instantiate)
Eric W. Biederman444ceed2006-10-02 02:18:49 -07001783{
1784 struct task_struct *task = get_proc_task(dir);
1785 unsigned fd = name_to_int(dentry);
1786 struct dentry *result = ERR_PTR(-ENOENT);
1787
1788 if (!task)
1789 goto out_no_task;
1790 if (fd == ~0U)
1791 goto out;
1792
Miklos Szeredi27932742007-05-08 00:26:17 -07001793 result = instantiate(dir, dentry, task, &fd);
Eric W. Biederman28a6d672006-10-02 02:17:05 -07001794out:
1795 put_task_struct(task);
1796out_no_task:
1797 return result;
Eric W. Biederman28a6d672006-10-02 02:17:05 -07001798}
1799
Miklos Szeredi27932742007-05-08 00:26:17 -07001800static int proc_readfd_common(struct file * filp, void * dirent,
1801 filldir_t filldir, instantiate_t instantiate)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001802{
Josef "Jeff" Sipek2fddfee2006-12-08 02:36:36 -08001803 struct dentry *dentry = filp->f_path.dentry;
Eric W. Biederman56347082006-06-26 00:25:40 -07001804 struct inode *inode = dentry->d_inode;
Eric W. Biederman99f89552006-06-26 00:25:55 -07001805 struct task_struct *p = get_proc_task(inode);
Pavel Emelyanov457c2512007-10-18 23:40:43 -07001806 unsigned int fd, ino;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001807 int retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001808 struct files_struct * files;
1809
1810 retval = -ENOENT;
Eric W. Biederman99f89552006-06-26 00:25:55 -07001811 if (!p)
1812 goto out_no_task;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001813 retval = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001814
1815 fd = filp->f_pos;
1816 switch (fd) {
1817 case 0:
1818 if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0)
1819 goto out;
1820 filp->f_pos++;
1821 case 1:
Eric W. Biederman56347082006-06-26 00:25:40 -07001822 ino = parent_ino(dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001823 if (filldir(dirent, "..", 2, 1, ino, DT_DIR) < 0)
1824 goto out;
1825 filp->f_pos++;
1826 default:
1827 files = get_files_struct(p);
1828 if (!files)
1829 goto out;
Dipankar Sarmab8359962005-09-09 13:04:14 -07001830 rcu_read_lock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001831 for (fd = filp->f_pos-2;
Al Viro9b4f5262008-04-22 01:32:44 -04001832 fd < files_fdtable(files)->max_fds;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001833 fd++, filp->f_pos++) {
Miklos Szeredi27932742007-05-08 00:26:17 -07001834 char name[PROC_NUMBUF];
1835 int len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001836
1837 if (!fcheck_files(files, fd))
1838 continue;
Dipankar Sarmab8359962005-09-09 13:04:14 -07001839 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001840
Miklos Szeredi27932742007-05-08 00:26:17 -07001841 len = snprintf(name, sizeof(name), "%d", fd);
1842 if (proc_fill_cache(filp, dirent, filldir,
1843 name, len, instantiate,
1844 p, &fd) < 0) {
Dipankar Sarmab8359962005-09-09 13:04:14 -07001845 rcu_read_lock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001846 break;
1847 }
Dipankar Sarmab8359962005-09-09 13:04:14 -07001848 rcu_read_lock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001849 }
Dipankar Sarmab8359962005-09-09 13:04:14 -07001850 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001851 put_files_struct(files);
1852 }
1853out:
Eric W. Biederman99f89552006-06-26 00:25:55 -07001854 put_task_struct(p);
1855out_no_task:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001856 return retval;
1857}
1858
Miklos Szeredi27932742007-05-08 00:26:17 -07001859static struct dentry *proc_lookupfd(struct inode *dir, struct dentry *dentry,
1860 struct nameidata *nd)
1861{
1862 return proc_lookupfd_common(dir, dentry, proc_fd_instantiate);
1863}
1864
1865static int proc_readfd(struct file *filp, void *dirent, filldir_t filldir)
1866{
1867 return proc_readfd_common(filp, dirent, filldir, proc_fd_instantiate);
1868}
1869
1870static ssize_t proc_fdinfo_read(struct file *file, char __user *buf,
1871 size_t len, loff_t *ppos)
1872{
1873 char tmp[PROC_FDINFO_MAX];
Jan Blunck3dcd25f2008-02-14 19:38:35 -08001874 int err = proc_fd_info(file->f_path.dentry->d_inode, NULL, tmp);
Miklos Szeredi27932742007-05-08 00:26:17 -07001875 if (!err)
1876 err = simple_read_from_buffer(buf, len, ppos, tmp, strlen(tmp));
1877 return err;
1878}
1879
1880static const struct file_operations proc_fdinfo_file_operations = {
1881 .open = nonseekable_open,
1882 .read = proc_fdinfo_read,
1883};
1884
Arjan van de Ven00977a52007-02-12 00:55:34 -08001885static const struct file_operations proc_fd_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001886 .read = generic_read_dir,
1887 .readdir = proc_readfd,
1888};
1889
Linus Torvalds1da177e2005-04-16 15:20:36 -07001890/*
Alexey Dobriyan8948e112007-05-08 00:23:35 -07001891 * /proc/pid/fd needs a special permission handler so that a process can still
1892 * access /proc/self/fd after it has executed a setuid().
1893 */
Al Viroe6305c42008-07-15 21:03:57 -04001894static int proc_fd_permission(struct inode *inode, int mask)
Alexey Dobriyan8948e112007-05-08 00:23:35 -07001895{
1896 int rv;
1897
1898 rv = generic_permission(inode, mask, NULL);
1899 if (rv == 0)
1900 return 0;
1901 if (task_pid(current) == proc_pid(inode))
1902 rv = 0;
1903 return rv;
1904}
1905
1906/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001907 * proc directories can do almost nothing..
1908 */
Arjan van de Venc5ef1c42007-02-12 00:55:40 -08001909static const struct inode_operations proc_fd_inode_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001910 .lookup = proc_lookupfd,
Alexey Dobriyan8948e112007-05-08 00:23:35 -07001911 .permission = proc_fd_permission,
Linus Torvalds6d76fa52006-07-15 12:26:45 -07001912 .setattr = proc_setattr,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001913};
1914
Miklos Szeredi27932742007-05-08 00:26:17 -07001915static struct dentry *proc_fdinfo_instantiate(struct inode *dir,
1916 struct dentry *dentry, struct task_struct *task, const void *ptr)
1917{
1918 unsigned fd = *(unsigned *)ptr;
1919 struct inode *inode;
1920 struct proc_inode *ei;
1921 struct dentry *error = ERR_PTR(-ENOENT);
1922
1923 inode = proc_pid_make_inode(dir->i_sb, task);
1924 if (!inode)
1925 goto out;
1926 ei = PROC_I(inode);
1927 ei->fd = fd;
1928 inode->i_mode = S_IFREG | S_IRUSR;
1929 inode->i_fop = &proc_fdinfo_file_operations;
1930 dentry->d_op = &tid_fd_dentry_operations;
1931 d_add(dentry, inode);
1932 /* Close the race of the process dying before we return the dentry */
1933 if (tid_fd_revalidate(dentry, NULL))
1934 error = NULL;
1935
1936 out:
1937 return error;
1938}
1939
1940static struct dentry *proc_lookupfdinfo(struct inode *dir,
1941 struct dentry *dentry,
1942 struct nameidata *nd)
1943{
1944 return proc_lookupfd_common(dir, dentry, proc_fdinfo_instantiate);
1945}
1946
1947static int proc_readfdinfo(struct file *filp, void *dirent, filldir_t filldir)
1948{
1949 return proc_readfd_common(filp, dirent, filldir,
1950 proc_fdinfo_instantiate);
1951}
1952
1953static const struct file_operations proc_fdinfo_operations = {
1954 .read = generic_read_dir,
1955 .readdir = proc_readfdinfo,
1956};
1957
1958/*
1959 * proc directories can do almost nothing..
1960 */
1961static const struct inode_operations proc_fdinfo_inode_operations = {
1962 .lookup = proc_lookupfdinfo,
1963 .setattr = proc_setattr,
1964};
1965
1966
Eric W. Biederman444ceed2006-10-02 02:18:49 -07001967static struct dentry *proc_pident_instantiate(struct inode *dir,
Eric Dumazetc5141e62007-05-08 00:26:15 -07001968 struct dentry *dentry, struct task_struct *task, const void *ptr)
Eric W. Biederman444ceed2006-10-02 02:18:49 -07001969{
Eric Dumazetc5141e62007-05-08 00:26:15 -07001970 const struct pid_entry *p = ptr;
Eric W. Biederman444ceed2006-10-02 02:18:49 -07001971 struct inode *inode;
1972 struct proc_inode *ei;
1973 struct dentry *error = ERR_PTR(-EINVAL);
1974
Eric W. Biederman61a28782006-10-02 02:18:49 -07001975 inode = proc_pid_make_inode(dir->i_sb, task);
Eric W. Biederman444ceed2006-10-02 02:18:49 -07001976 if (!inode)
1977 goto out;
1978
1979 ei = PROC_I(inode);
1980 inode->i_mode = p->mode;
1981 if (S_ISDIR(inode->i_mode))
1982 inode->i_nlink = 2; /* Use getattr to fix if necessary */
1983 if (p->iop)
1984 inode->i_op = p->iop;
1985 if (p->fop)
1986 inode->i_fop = p->fop;
1987 ei->op = p->op;
1988 dentry->d_op = &pid_dentry_operations;
1989 d_add(dentry, inode);
1990 /* Close the race of the process dying before we return the dentry */
1991 if (pid_revalidate(dentry, NULL))
1992 error = NULL;
1993out:
1994 return error;
1995}
1996
Linus Torvalds1da177e2005-04-16 15:20:36 -07001997static struct dentry *proc_pident_lookup(struct inode *dir,
1998 struct dentry *dentry,
Eric Dumazetc5141e62007-05-08 00:26:15 -07001999 const struct pid_entry *ents,
Eric W. Biederman7bcd6b02006-10-02 02:18:56 -07002000 unsigned int nents)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002001{
Eric W. Biedermancd6a3ce2006-06-26 00:25:49 -07002002 struct dentry *error;
Eric W. Biederman99f89552006-06-26 00:25:55 -07002003 struct task_struct *task = get_proc_task(dir);
Eric Dumazetc5141e62007-05-08 00:26:15 -07002004 const struct pid_entry *p, *last;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002005
Eric W. Biedermancd6a3ce2006-06-26 00:25:49 -07002006 error = ERR_PTR(-ENOENT);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002007
Eric W. Biederman99f89552006-06-26 00:25:55 -07002008 if (!task)
2009 goto out_no_task;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002010
Eric W. Biederman20cdc892006-10-02 02:17:07 -07002011 /*
2012 * Yes, it does not scale. And it should not. Don't add
2013 * new entries into /proc/<tgid>/ without very good reasons.
2014 */
Eric W. Biederman7bcd6b02006-10-02 02:18:56 -07002015 last = &ents[nents - 1];
2016 for (p = ents; p <= last; p++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002017 if (p->len != dentry->d_name.len)
2018 continue;
2019 if (!memcmp(dentry->d_name.name, p->name, p->len))
2020 break;
2021 }
Eric W. Biederman7bcd6b02006-10-02 02:18:56 -07002022 if (p > last)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002023 goto out;
2024
Eric W. Biederman444ceed2006-10-02 02:18:49 -07002025 error = proc_pident_instantiate(dir, dentry, task, p);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002026out:
Eric W. Biederman99f89552006-06-26 00:25:55 -07002027 put_task_struct(task);
2028out_no_task:
Eric W. Biedermancd6a3ce2006-06-26 00:25:49 -07002029 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002030}
2031
Eric Dumazetc5141e62007-05-08 00:26:15 -07002032static int proc_pident_fill_cache(struct file *filp, void *dirent,
2033 filldir_t filldir, struct task_struct *task, const struct pid_entry *p)
Eric W. Biederman61a28782006-10-02 02:18:49 -07002034{
2035 return proc_fill_cache(filp, dirent, filldir, p->name, p->len,
2036 proc_pident_instantiate, task, p);
2037}
2038
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002039static int proc_pident_readdir(struct file *filp,
2040 void *dirent, filldir_t filldir,
Eric Dumazetc5141e62007-05-08 00:26:15 -07002041 const struct pid_entry *ents, unsigned int nents)
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002042{
2043 int i;
Josef "Jeff" Sipek2fddfee2006-12-08 02:36:36 -08002044 struct dentry *dentry = filp->f_path.dentry;
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002045 struct inode *inode = dentry->d_inode;
2046 struct task_struct *task = get_proc_task(inode);
Eric Dumazetc5141e62007-05-08 00:26:15 -07002047 const struct pid_entry *p, *last;
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002048 ino_t ino;
2049 int ret;
2050
2051 ret = -ENOENT;
2052 if (!task)
Eric W. Biederman61a28782006-10-02 02:18:49 -07002053 goto out_no_task;
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002054
2055 ret = 0;
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002056 i = filp->f_pos;
2057 switch (i) {
2058 case 0:
2059 ino = inode->i_ino;
2060 if (filldir(dirent, ".", 1, i, ino, DT_DIR) < 0)
2061 goto out;
2062 i++;
2063 filp->f_pos++;
2064 /* fall through */
2065 case 1:
2066 ino = parent_ino(dentry);
2067 if (filldir(dirent, "..", 2, i, ino, DT_DIR) < 0)
2068 goto out;
2069 i++;
2070 filp->f_pos++;
2071 /* fall through */
2072 default:
2073 i -= 2;
2074 if (i >= nents) {
2075 ret = 1;
2076 goto out;
2077 }
2078 p = ents + i;
Eric W. Biederman7bcd6b02006-10-02 02:18:56 -07002079 last = &ents[nents - 1];
2080 while (p <= last) {
Eric W. Biederman61a28782006-10-02 02:18:49 -07002081 if (proc_pident_fill_cache(filp, dirent, filldir, task, p) < 0)
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002082 goto out;
2083 filp->f_pos++;
2084 p++;
2085 }
2086 }
2087
2088 ret = 1;
2089out:
Eric W. Biederman61a28782006-10-02 02:18:49 -07002090 put_task_struct(task);
2091out_no_task:
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002092 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002093}
2094
Linus Torvalds1da177e2005-04-16 15:20:36 -07002095#ifdef CONFIG_SECURITY
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002096static ssize_t proc_pid_attr_read(struct file * file, char __user * buf,
2097 size_t count, loff_t *ppos)
2098{
Josef "Jeff" Sipek2fddfee2006-12-08 02:36:36 -08002099 struct inode * inode = file->f_path.dentry->d_inode;
Al Viro04ff9702007-03-12 16:17:58 +00002100 char *p = NULL;
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002101 ssize_t length;
2102 struct task_struct *task = get_proc_task(inode);
2103
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002104 if (!task)
Al Viro04ff9702007-03-12 16:17:58 +00002105 return -ESRCH;
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002106
2107 length = security_getprocattr(task,
Josef "Jeff" Sipek2fddfee2006-12-08 02:36:36 -08002108 (char*)file->f_path.dentry->d_name.name,
Al Viro04ff9702007-03-12 16:17:58 +00002109 &p);
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002110 put_task_struct(task);
Al Viro04ff9702007-03-12 16:17:58 +00002111 if (length > 0)
2112 length = simple_read_from_buffer(buf, count, ppos, p, length);
2113 kfree(p);
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002114 return length;
2115}
2116
2117static ssize_t proc_pid_attr_write(struct file * file, const char __user * buf,
2118 size_t count, loff_t *ppos)
2119{
Josef "Jeff" Sipek2fddfee2006-12-08 02:36:36 -08002120 struct inode * inode = file->f_path.dentry->d_inode;
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002121 char *page;
2122 ssize_t length;
2123 struct task_struct *task = get_proc_task(inode);
2124
2125 length = -ESRCH;
2126 if (!task)
2127 goto out_no_task;
2128 if (count > PAGE_SIZE)
2129 count = PAGE_SIZE;
2130
2131 /* No partial writes. */
2132 length = -EINVAL;
2133 if (*ppos != 0)
2134 goto out;
2135
2136 length = -ENOMEM;
Mel Gormane12ba742007-10-16 01:25:52 -07002137 page = (char*)__get_free_page(GFP_TEMPORARY);
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002138 if (!page)
2139 goto out;
2140
2141 length = -EFAULT;
2142 if (copy_from_user(page, buf, count))
2143 goto out_free;
2144
2145 length = security_setprocattr(task,
Josef "Jeff" Sipek2fddfee2006-12-08 02:36:36 -08002146 (char*)file->f_path.dentry->d_name.name,
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002147 (void*)page, count);
2148out_free:
2149 free_page((unsigned long) page);
2150out:
2151 put_task_struct(task);
2152out_no_task:
2153 return length;
2154}
2155
Arjan van de Ven00977a52007-02-12 00:55:34 -08002156static const struct file_operations proc_pid_attr_operations = {
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002157 .read = proc_pid_attr_read,
2158 .write = proc_pid_attr_write,
2159};
2160
Eric Dumazetc5141e62007-05-08 00:26:15 -07002161static const struct pid_entry attr_dir_stuff[] = {
Alexey Dobriyan631f9c12008-11-10 01:32:52 +03002162 REG("current", S_IRUGO|S_IWUGO, proc_pid_attr_operations),
2163 REG("prev", S_IRUGO, proc_pid_attr_operations),
2164 REG("exec", S_IRUGO|S_IWUGO, proc_pid_attr_operations),
2165 REG("fscreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations),
2166 REG("keycreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations),
2167 REG("sockcreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations),
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002168};
2169
Eric W. Biederman72d9dcf2006-10-02 02:18:50 -07002170static int proc_attr_dir_readdir(struct file * filp,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002171 void * dirent, filldir_t filldir)
2172{
2173 return proc_pident_readdir(filp,dirent,filldir,
Eric W. Biederman72d9dcf2006-10-02 02:18:50 -07002174 attr_dir_stuff,ARRAY_SIZE(attr_dir_stuff));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002175}
2176
Arjan van de Ven00977a52007-02-12 00:55:34 -08002177static const struct file_operations proc_attr_dir_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002178 .read = generic_read_dir,
Eric W. Biederman72d9dcf2006-10-02 02:18:50 -07002179 .readdir = proc_attr_dir_readdir,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002180};
2181
Eric W. Biederman72d9dcf2006-10-02 02:18:50 -07002182static struct dentry *proc_attr_dir_lookup(struct inode *dir,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002183 struct dentry *dentry, struct nameidata *nd)
2184{
Eric W. Biederman7bcd6b02006-10-02 02:18:56 -07002185 return proc_pident_lookup(dir, dentry,
2186 attr_dir_stuff, ARRAY_SIZE(attr_dir_stuff));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002187}
2188
Arjan van de Venc5ef1c42007-02-12 00:55:40 -08002189static const struct inode_operations proc_attr_dir_inode_operations = {
Eric W. Biederman72d9dcf2006-10-02 02:18:50 -07002190 .lookup = proc_attr_dir_lookup,
Eric W. Biederman99f89552006-06-26 00:25:55 -07002191 .getattr = pid_getattr,
Linus Torvalds6d76fa52006-07-15 12:26:45 -07002192 .setattr = proc_setattr,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002193};
2194
Linus Torvalds1da177e2005-04-16 15:20:36 -07002195#endif
2196
Kawai, Hidehiro3cb4a0b2007-07-19 01:48:28 -07002197#if defined(USE_ELF_CORE_DUMP) && defined(CONFIG_ELF_CORE)
2198static ssize_t proc_coredump_filter_read(struct file *file, char __user *buf,
2199 size_t count, loff_t *ppos)
2200{
2201 struct task_struct *task = get_proc_task(file->f_dentry->d_inode);
2202 struct mm_struct *mm;
2203 char buffer[PROC_NUMBUF];
2204 size_t len;
2205 int ret;
2206
2207 if (!task)
2208 return -ESRCH;
2209
2210 ret = 0;
2211 mm = get_task_mm(task);
2212 if (mm) {
2213 len = snprintf(buffer, sizeof(buffer), "%08lx\n",
2214 ((mm->flags & MMF_DUMP_FILTER_MASK) >>
2215 MMF_DUMP_FILTER_SHIFT));
2216 mmput(mm);
2217 ret = simple_read_from_buffer(buf, count, ppos, buffer, len);
2218 }
2219
2220 put_task_struct(task);
2221
2222 return ret;
2223}
2224
2225static ssize_t proc_coredump_filter_write(struct file *file,
2226 const char __user *buf,
2227 size_t count,
2228 loff_t *ppos)
2229{
2230 struct task_struct *task;
2231 struct mm_struct *mm;
2232 char buffer[PROC_NUMBUF], *end;
2233 unsigned int val;
2234 int ret;
2235 int i;
2236 unsigned long mask;
2237
2238 ret = -EFAULT;
2239 memset(buffer, 0, sizeof(buffer));
2240 if (count > sizeof(buffer) - 1)
2241 count = sizeof(buffer) - 1;
2242 if (copy_from_user(buffer, buf, count))
2243 goto out_no_task;
2244
2245 ret = -EINVAL;
2246 val = (unsigned int)simple_strtoul(buffer, &end, 0);
2247 if (*end == '\n')
2248 end++;
2249 if (end - buffer == 0)
2250 goto out_no_task;
2251
2252 ret = -ESRCH;
2253 task = get_proc_task(file->f_dentry->d_inode);
2254 if (!task)
2255 goto out_no_task;
2256
2257 ret = end - buffer;
2258 mm = get_task_mm(task);
2259 if (!mm)
2260 goto out_no_mm;
2261
2262 for (i = 0, mask = 1; i < MMF_DUMP_FILTER_BITS; i++, mask <<= 1) {
2263 if (val & mask)
2264 set_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags);
2265 else
2266 clear_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags);
2267 }
2268
2269 mmput(mm);
2270 out_no_mm:
2271 put_task_struct(task);
2272 out_no_task:
2273 return ret;
2274}
2275
2276static const struct file_operations proc_coredump_filter_operations = {
2277 .read = proc_coredump_filter_read,
2278 .write = proc_coredump_filter_write,
2279};
2280#endif
2281
Linus Torvalds1da177e2005-04-16 15:20:36 -07002282/*
2283 * /proc/self:
2284 */
2285static int proc_self_readlink(struct dentry *dentry, char __user *buffer,
2286 int buflen)
2287{
Eric W. Biederman488e5bc2008-02-08 04:18:34 -08002288 struct pid_namespace *ns = dentry->d_sb->s_fs_info;
Andrew Mortonb55fcb22008-02-08 15:00:43 -08002289 pid_t tgid = task_tgid_nr_ns(current, ns);
Eric W. Biederman8578cea2006-06-26 00:25:54 -07002290 char tmp[PROC_NUMBUF];
Andrew Mortonb55fcb22008-02-08 15:00:43 -08002291 if (!tgid)
Eric W. Biederman488e5bc2008-02-08 04:18:34 -08002292 return -ENOENT;
Andrew Mortonb55fcb22008-02-08 15:00:43 -08002293 sprintf(tmp, "%d", tgid);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002294 return vfs_readlink(dentry,buffer,buflen,tmp);
2295}
2296
Al Viro008b1502005-08-20 00:17:39 +01002297static void *proc_self_follow_link(struct dentry *dentry, struct nameidata *nd)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002298{
Eric W. Biederman488e5bc2008-02-08 04:18:34 -08002299 struct pid_namespace *ns = dentry->d_sb->s_fs_info;
Andrew Mortonb55fcb22008-02-08 15:00:43 -08002300 pid_t tgid = task_tgid_nr_ns(current, ns);
Eric W. Biederman8578cea2006-06-26 00:25:54 -07002301 char tmp[PROC_NUMBUF];
Andrew Mortonb55fcb22008-02-08 15:00:43 -08002302 if (!tgid)
Eric W. Biederman488e5bc2008-02-08 04:18:34 -08002303 return ERR_PTR(-ENOENT);
Andrew Mortonb55fcb22008-02-08 15:00:43 -08002304 sprintf(tmp, "%d", task_tgid_nr_ns(current, ns));
Al Viro008b1502005-08-20 00:17:39 +01002305 return ERR_PTR(vfs_follow_link(nd,tmp));
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002306}
Linus Torvalds1da177e2005-04-16 15:20:36 -07002307
Arjan van de Venc5ef1c42007-02-12 00:55:40 -08002308static const struct inode_operations proc_self_inode_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002309 .readlink = proc_self_readlink,
2310 .follow_link = proc_self_follow_link,
2311};
2312
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002313/*
Eric W. Biederman801199c2006-10-02 02:18:48 -07002314 * proc base
2315 *
2316 * These are the directory entries in the root directory of /proc
2317 * that properly belong to the /proc filesystem, as they describe
2318 * describe something that is process related.
2319 */
Eric Dumazetc5141e62007-05-08 00:26:15 -07002320static const struct pid_entry proc_base_stuff[] = {
Eric W. Biederman61a28782006-10-02 02:18:49 -07002321 NOD("self", S_IFLNK|S_IRWXUGO,
Eric W. Biederman801199c2006-10-02 02:18:48 -07002322 &proc_self_inode_operations, NULL, {}),
Eric W. Biederman801199c2006-10-02 02:18:48 -07002323};
2324
2325/*
2326 * Exceptional case: normally we are not allowed to unhash a busy
2327 * directory. In this case, however, we can do it - no aliasing problems
2328 * due to the way we treat inodes.
2329 */
2330static int proc_base_revalidate(struct dentry *dentry, struct nameidata *nd)
2331{
2332 struct inode *inode = dentry->d_inode;
2333 struct task_struct *task = get_proc_task(inode);
2334 if (task) {
2335 put_task_struct(task);
2336 return 1;
2337 }
2338 d_drop(dentry);
2339 return 0;
2340}
2341
2342static struct dentry_operations proc_base_dentry_operations =
2343{
2344 .d_revalidate = proc_base_revalidate,
2345 .d_delete = pid_delete_dentry,
2346};
2347
Eric W. Biederman444ceed2006-10-02 02:18:49 -07002348static struct dentry *proc_base_instantiate(struct inode *dir,
Eric Dumazetc5141e62007-05-08 00:26:15 -07002349 struct dentry *dentry, struct task_struct *task, const void *ptr)
Eric W. Biederman801199c2006-10-02 02:18:48 -07002350{
Eric Dumazetc5141e62007-05-08 00:26:15 -07002351 const struct pid_entry *p = ptr;
Eric W. Biederman801199c2006-10-02 02:18:48 -07002352 struct inode *inode;
Eric W. Biederman801199c2006-10-02 02:18:48 -07002353 struct proc_inode *ei;
Eric W. Biederman444ceed2006-10-02 02:18:49 -07002354 struct dentry *error = ERR_PTR(-EINVAL);
Eric W. Biederman801199c2006-10-02 02:18:48 -07002355
2356 /* Allocate the inode */
2357 error = ERR_PTR(-ENOMEM);
2358 inode = new_inode(dir->i_sb);
2359 if (!inode)
2360 goto out;
2361
2362 /* Initialize the inode */
2363 ei = PROC_I(inode);
2364 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
Eric W. Biederman801199c2006-10-02 02:18:48 -07002365
2366 /*
2367 * grab the reference to the task.
2368 */
Oleg Nesterov1a657f72006-10-02 02:18:59 -07002369 ei->pid = get_task_pid(task, PIDTYPE_PID);
Eric W. Biederman801199c2006-10-02 02:18:48 -07002370 if (!ei->pid)
2371 goto out_iput;
2372
Eric W. Biederman801199c2006-10-02 02:18:48 -07002373 inode->i_mode = p->mode;
2374 if (S_ISDIR(inode->i_mode))
2375 inode->i_nlink = 2;
2376 if (S_ISLNK(inode->i_mode))
2377 inode->i_size = 64;
2378 if (p->iop)
2379 inode->i_op = p->iop;
2380 if (p->fop)
2381 inode->i_fop = p->fop;
2382 ei->op = p->op;
2383 dentry->d_op = &proc_base_dentry_operations;
2384 d_add(dentry, inode);
2385 error = NULL;
2386out:
Eric W. Biederman801199c2006-10-02 02:18:48 -07002387 return error;
2388out_iput:
2389 iput(inode);
2390 goto out;
2391}
2392
Eric W. Biederman444ceed2006-10-02 02:18:49 -07002393static struct dentry *proc_base_lookup(struct inode *dir, struct dentry *dentry)
2394{
2395 struct dentry *error;
2396 struct task_struct *task = get_proc_task(dir);
Eric Dumazetc5141e62007-05-08 00:26:15 -07002397 const struct pid_entry *p, *last;
Eric W. Biederman444ceed2006-10-02 02:18:49 -07002398
2399 error = ERR_PTR(-ENOENT);
2400
2401 if (!task)
2402 goto out_no_task;
2403
2404 /* Lookup the directory entry */
Eric W. Biederman7bcd6b02006-10-02 02:18:56 -07002405 last = &proc_base_stuff[ARRAY_SIZE(proc_base_stuff) - 1];
2406 for (p = proc_base_stuff; p <= last; p++) {
Eric W. Biederman444ceed2006-10-02 02:18:49 -07002407 if (p->len != dentry->d_name.len)
2408 continue;
2409 if (!memcmp(dentry->d_name.name, p->name, p->len))
2410 break;
2411 }
Eric W. Biederman7bcd6b02006-10-02 02:18:56 -07002412 if (p > last)
Eric W. Biederman444ceed2006-10-02 02:18:49 -07002413 goto out;
2414
2415 error = proc_base_instantiate(dir, dentry, task, p);
2416
2417out:
2418 put_task_struct(task);
2419out_no_task:
2420 return error;
2421}
2422
Eric Dumazetc5141e62007-05-08 00:26:15 -07002423static int proc_base_fill_cache(struct file *filp, void *dirent,
2424 filldir_t filldir, struct task_struct *task, const struct pid_entry *p)
Eric W. Biederman61a28782006-10-02 02:18:49 -07002425{
2426 return proc_fill_cache(filp, dirent, filldir, p->name, p->len,
2427 proc_base_instantiate, task, p);
2428}
2429
Andrew Mortonaba76fd2006-12-10 02:19:48 -08002430#ifdef CONFIG_TASK_IO_ACCOUNTING
Andrea Righi297c5d92008-07-25 01:48:49 -07002431static int do_io_accounting(struct task_struct *task, char *buffer, int whole)
Andrew Mortonaba76fd2006-12-10 02:19:48 -08002432{
Andrea Righi940389b2008-07-28 00:48:12 +02002433 struct task_io_accounting acct = task->ioac;
Andrea Righi59954772008-07-27 17:29:15 +02002434 unsigned long flags;
Andrea Righi297c5d92008-07-25 01:48:49 -07002435
Andrea Righi59954772008-07-27 17:29:15 +02002436 if (whole && lock_task_sighand(task, &flags)) {
2437 struct task_struct *t = task;
Andrea Righib2d002d2008-07-26 15:22:27 -07002438
Andrea Righi59954772008-07-27 17:29:15 +02002439 task_io_accounting_add(&acct, &task->signal->ioac);
2440 while_each_thread(task, t)
2441 task_io_accounting_add(&acct, &t->ioac);
Andrea Righi297c5d92008-07-25 01:48:49 -07002442
Andrea Righi59954772008-07-27 17:29:15 +02002443 unlock_task_sighand(task, &flags);
Andrea Righi297c5d92008-07-25 01:48:49 -07002444 }
Andrew Mortonaba76fd2006-12-10 02:19:48 -08002445 return sprintf(buffer,
2446 "rchar: %llu\n"
2447 "wchar: %llu\n"
2448 "syscr: %llu\n"
2449 "syscw: %llu\n"
2450 "read_bytes: %llu\n"
2451 "write_bytes: %llu\n"
2452 "cancelled_write_bytes: %llu\n",
Alexander Beregalov7c443192008-08-05 13:01:34 -07002453 (unsigned long long)acct.rchar,
2454 (unsigned long long)acct.wchar,
2455 (unsigned long long)acct.syscr,
2456 (unsigned long long)acct.syscw,
2457 (unsigned long long)acct.read_bytes,
2458 (unsigned long long)acct.write_bytes,
2459 (unsigned long long)acct.cancelled_write_bytes);
Andrew Mortonaba76fd2006-12-10 02:19:48 -08002460}
Andrea Righi297c5d92008-07-25 01:48:49 -07002461
2462static int proc_tid_io_accounting(struct task_struct *task, char *buffer)
2463{
2464 return do_io_accounting(task, buffer, 0);
2465}
2466
2467static int proc_tgid_io_accounting(struct task_struct *task, char *buffer)
2468{
2469 return do_io_accounting(task, buffer, 1);
2470}
2471#endif /* CONFIG_TASK_IO_ACCOUNTING */
Andrew Mortonaba76fd2006-12-10 02:19:48 -08002472
Kees Cook47830722008-10-06 03:11:58 +04002473static int proc_pid_personality(struct seq_file *m, struct pid_namespace *ns,
2474 struct pid *pid, struct task_struct *task)
2475{
2476 seq_printf(m, "%08x\n", task->personality);
2477 return 0;
2478}
2479
Eric W. Biederman801199c2006-10-02 02:18:48 -07002480/*
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002481 * Thread groups
2482 */
Arjan van de Ven00977a52007-02-12 00:55:34 -08002483static const struct file_operations proc_task_operations;
Arjan van de Venc5ef1c42007-02-12 00:55:40 -08002484static const struct inode_operations proc_task_inode_operations;
Eric W. Biederman20cdc892006-10-02 02:17:07 -07002485
Eric Dumazetc5141e62007-05-08 00:26:15 -07002486static const struct pid_entry tgid_base_stuff[] = {
Alexey Dobriyan631f9c12008-11-10 01:32:52 +03002487 DIR("task", S_IRUGO|S_IXUGO, proc_task_inode_operations, proc_task_operations),
2488 DIR("fd", S_IRUSR|S_IXUSR, proc_fd_inode_operations, proc_fd_operations),
2489 DIR("fdinfo", S_IRUSR|S_IXUSR, proc_fdinfo_inode_operations, proc_fdinfo_operations),
Andrew Mortonb2211a32008-03-11 18:03:35 -07002490#ifdef CONFIG_NET
Alexey Dobriyan631f9c12008-11-10 01:32:52 +03002491 DIR("net", S_IRUGO|S_IXUGO, proc_net_inode_operations, proc_net_operations),
Andrew Mortonb2211a32008-03-11 18:03:35 -07002492#endif
Alexey Dobriyan631f9c12008-11-10 01:32:52 +03002493 REG("environ", S_IRUSR, proc_environ_operations),
2494 INF("auxv", S_IRUSR, proc_pid_auxv),
2495 ONE("status", S_IRUGO, proc_pid_status),
2496 ONE("personality", S_IRUSR, proc_pid_personality),
2497 INF("limits", S_IRUSR, proc_pid_limits),
Ingo Molnar43ae34c2007-07-09 18:52:00 +02002498#ifdef CONFIG_SCHED_DEBUG
Alexey Dobriyan631f9c12008-11-10 01:32:52 +03002499 REG("sched", S_IRUGO|S_IWUSR, proc_pid_sched_operations),
Ingo Molnar43ae34c2007-07-09 18:52:00 +02002500#endif
Roland McGrathebcb6732008-07-25 19:46:00 -07002501#ifdef CONFIG_HAVE_ARCH_TRACEHOOK
Alexey Dobriyan631f9c12008-11-10 01:32:52 +03002502 INF("syscall", S_IRUSR, proc_pid_syscall),
Roland McGrathebcb6732008-07-25 19:46:00 -07002503#endif
Alexey Dobriyan631f9c12008-11-10 01:32:52 +03002504 INF("cmdline", S_IRUGO, proc_pid_cmdline),
2505 ONE("stat", S_IRUGO, proc_tgid_stat),
2506 ONE("statm", S_IRUGO, proc_pid_statm),
2507 REG("maps", S_IRUGO, proc_maps_operations),
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002508#ifdef CONFIG_NUMA
Alexey Dobriyan631f9c12008-11-10 01:32:52 +03002509 REG("numa_maps", S_IRUGO, proc_numa_maps_operations),
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002510#endif
Alexey Dobriyan631f9c12008-11-10 01:32:52 +03002511 REG("mem", S_IRUSR|S_IWUSR, proc_mem_operations),
2512 LNK("cwd", proc_cwd_link),
2513 LNK("root", proc_root_link),
2514 LNK("exe", proc_exe_link),
2515 REG("mounts", S_IRUGO, proc_mounts_operations),
2516 REG("mountinfo", S_IRUGO, proc_mountinfo_operations),
2517 REG("mountstats", S_IRUSR, proc_mountstats_operations),
Matt Mackall1e883282008-02-04 22:29:07 -08002518#ifdef CONFIG_PROC_PAGE_MONITOR
Alexey Dobriyan631f9c12008-11-10 01:32:52 +03002519 REG("clear_refs", S_IWUSR, proc_clear_refs_operations),
2520 REG("smaps", S_IRUGO, proc_smaps_operations),
2521 REG("pagemap", S_IRUSR, proc_pagemap_operations),
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002522#endif
2523#ifdef CONFIG_SECURITY
Alexey Dobriyan631f9c12008-11-10 01:32:52 +03002524 DIR("attr", S_IRUGO|S_IXUGO, proc_attr_dir_inode_operations, proc_attr_dir_operations),
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002525#endif
2526#ifdef CONFIG_KALLSYMS
Alexey Dobriyan631f9c12008-11-10 01:32:52 +03002527 INF("wchan", S_IRUGO, proc_pid_wchan),
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002528#endif
Ken Chen2ec220e2008-11-10 11:26:08 +03002529#ifdef CONFIG_STACKTRACE
2530 ONE("stack", S_IRUSR, proc_pid_stack),
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002531#endif
2532#ifdef CONFIG_SCHEDSTATS
Alexey Dobriyan631f9c12008-11-10 01:32:52 +03002533 INF("schedstat", S_IRUGO, proc_pid_schedstat),
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002534#endif
Arjan van de Ven97455122008-01-25 21:08:34 +01002535#ifdef CONFIG_LATENCYTOP
Alexey Dobriyan631f9c12008-11-10 01:32:52 +03002536 REG("latency", S_IRUGO, proc_lstats_operations),
Arjan van de Ven97455122008-01-25 21:08:34 +01002537#endif
Paul Menage8793d852007-10-18 23:39:39 -07002538#ifdef CONFIG_PROC_PID_CPUSET
Alexey Dobriyan631f9c12008-11-10 01:32:52 +03002539 REG("cpuset", S_IRUGO, proc_cpuset_operations),
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002540#endif
Paul Menagea4243162007-10-18 23:39:35 -07002541#ifdef CONFIG_CGROUPS
Alexey Dobriyan631f9c12008-11-10 01:32:52 +03002542 REG("cgroup", S_IRUGO, proc_cgroup_operations),
Paul Menagea4243162007-10-18 23:39:35 -07002543#endif
Alexey Dobriyan631f9c12008-11-10 01:32:52 +03002544 INF("oom_score", S_IRUGO, proc_oom_score),
2545 REG("oom_adj", S_IRUGO|S_IWUSR, proc_oom_adjust_operations),
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002546#ifdef CONFIG_AUDITSYSCALL
Alexey Dobriyan631f9c12008-11-10 01:32:52 +03002547 REG("loginuid", S_IWUSR|S_IRUGO, proc_loginuid_operations),
2548 REG("sessionid", S_IRUGO, proc_sessionid_operations),
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002549#endif
Akinobu Mitaf4f154f2006-12-08 02:39:47 -08002550#ifdef CONFIG_FAULT_INJECTION
Alexey Dobriyan631f9c12008-11-10 01:32:52 +03002551 REG("make-it-fail", S_IRUGO|S_IWUSR, proc_fault_inject_operations),
Akinobu Mitaf4f154f2006-12-08 02:39:47 -08002552#endif
Kawai, Hidehiro3cb4a0b2007-07-19 01:48:28 -07002553#if defined(USE_ELF_CORE_DUMP) && defined(CONFIG_ELF_CORE)
Alexey Dobriyan631f9c12008-11-10 01:32:52 +03002554 REG("coredump_filter", S_IRUGO|S_IWUSR, proc_coredump_filter_operations),
Kawai, Hidehiro3cb4a0b2007-07-19 01:48:28 -07002555#endif
Andrew Mortonaba76fd2006-12-10 02:19:48 -08002556#ifdef CONFIG_TASK_IO_ACCOUNTING
Alexey Dobriyan631f9c12008-11-10 01:32:52 +03002557 INF("io", S_IRUGO, proc_tgid_io_accounting),
Andrew Mortonaba76fd2006-12-10 02:19:48 -08002558#endif
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002559};
2560
2561static int proc_tgid_base_readdir(struct file * filp,
2562 void * dirent, filldir_t filldir)
2563{
2564 return proc_pident_readdir(filp,dirent,filldir,
2565 tgid_base_stuff,ARRAY_SIZE(tgid_base_stuff));
2566}
2567
Arjan van de Ven00977a52007-02-12 00:55:34 -08002568static const struct file_operations proc_tgid_base_operations = {
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002569 .read = generic_read_dir,
2570 .readdir = proc_tgid_base_readdir,
2571};
2572
2573static struct dentry *proc_tgid_base_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd){
Eric W. Biederman7bcd6b02006-10-02 02:18:56 -07002574 return proc_pident_lookup(dir, dentry,
2575 tgid_base_stuff, ARRAY_SIZE(tgid_base_stuff));
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002576}
2577
Arjan van de Venc5ef1c42007-02-12 00:55:40 -08002578static const struct inode_operations proc_tgid_base_inode_operations = {
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002579 .lookup = proc_tgid_base_lookup,
2580 .getattr = pid_getattr,
2581 .setattr = proc_setattr,
2582};
2583
Pavel Emelyanov60347f62007-10-18 23:40:03 -07002584static void proc_flush_task_mnt(struct vfsmount *mnt, pid_t pid, pid_t tgid)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002585{
Eric W. Biederman48e64842006-06-26 00:25:48 -07002586 struct dentry *dentry, *leader, *dir;
Eric W. Biederman8578cea2006-06-26 00:25:54 -07002587 char buf[PROC_NUMBUF];
Eric W. Biederman48e64842006-06-26 00:25:48 -07002588 struct qstr name;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002589
Eric W. Biederman48e64842006-06-26 00:25:48 -07002590 name.name = buf;
Pavel Emelyanov60347f62007-10-18 23:40:03 -07002591 name.len = snprintf(buf, sizeof(buf), "%d", pid);
2592 dentry = d_hash_and_lookup(mnt->mnt_root, &name);
Eric W. Biederman48e64842006-06-26 00:25:48 -07002593 if (dentry) {
Andrea Arcangeli77667552008-02-04 22:29:21 -08002594 if (!(current->flags & PF_EXITING))
2595 shrink_dcache_parent(dentry);
Eric W. Biederman48e64842006-06-26 00:25:48 -07002596 d_drop(dentry);
2597 dput(dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002598 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002599
Pavel Emelyanov60347f62007-10-18 23:40:03 -07002600 if (tgid == 0)
Eric W. Biederman48e64842006-06-26 00:25:48 -07002601 goto out;
2602
2603 name.name = buf;
Pavel Emelyanov60347f62007-10-18 23:40:03 -07002604 name.len = snprintf(buf, sizeof(buf), "%d", tgid);
2605 leader = d_hash_and_lookup(mnt->mnt_root, &name);
Eric W. Biederman48e64842006-06-26 00:25:48 -07002606 if (!leader)
2607 goto out;
2608
2609 name.name = "task";
2610 name.len = strlen(name.name);
2611 dir = d_hash_and_lookup(leader, &name);
2612 if (!dir)
2613 goto out_put_leader;
2614
2615 name.name = buf;
Pavel Emelyanov60347f62007-10-18 23:40:03 -07002616 name.len = snprintf(buf, sizeof(buf), "%d", pid);
Eric W. Biederman48e64842006-06-26 00:25:48 -07002617 dentry = d_hash_and_lookup(dir, &name);
2618 if (dentry) {
2619 shrink_dcache_parent(dentry);
2620 d_drop(dentry);
2621 dput(dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002622 }
Eric W. Biederman48e64842006-06-26 00:25:48 -07002623
2624 dput(dir);
2625out_put_leader:
2626 dput(leader);
2627out:
2628 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002629}
2630
Randy Dunlap0895e912007-10-21 21:00:10 -07002631/**
2632 * proc_flush_task - Remove dcache entries for @task from the /proc dcache.
2633 * @task: task that should be flushed.
2634 *
2635 * When flushing dentries from proc, one needs to flush them from global
Pavel Emelyanov60347f62007-10-18 23:40:03 -07002636 * proc (proc_mnt) and from all the namespaces' procs this task was seen
Randy Dunlap0895e912007-10-21 21:00:10 -07002637 * in. This call is supposed to do all of this job.
2638 *
2639 * Looks in the dcache for
2640 * /proc/@pid
2641 * /proc/@tgid/task/@pid
2642 * if either directory is present flushes it and all of it'ts children
2643 * from the dcache.
2644 *
2645 * It is safe and reasonable to cache /proc entries for a task until
2646 * that task exits. After that they just clog up the dcache with
2647 * useless entries, possibly causing useful dcache entries to be
2648 * flushed instead. This routine is proved to flush those useless
2649 * dcache entries at process exit time.
2650 *
2651 * NOTE: This routine is just an optimization so it does not guarantee
2652 * that no dcache entries will exist at process exit time it
2653 * just makes it very unlikely that any will persist.
Pavel Emelyanov60347f62007-10-18 23:40:03 -07002654 */
2655
2656void proc_flush_task(struct task_struct *task)
2657{
Eric W. Biederman9fcc2d12007-11-14 17:00:07 -08002658 int i;
2659 struct pid *pid, *tgid = NULL;
Pavel Emelyanov130f77e2007-10-18 23:40:11 -07002660 struct upid *upid;
2661
Pavel Emelyanov130f77e2007-10-18 23:40:11 -07002662 pid = task_pid(task);
Eric W. Biederman9fcc2d12007-11-14 17:00:07 -08002663 if (thread_group_leader(task))
2664 tgid = task_tgid(task);
Pavel Emelyanov130f77e2007-10-18 23:40:11 -07002665
Eric W. Biederman9fcc2d12007-11-14 17:00:07 -08002666 for (i = 0; i <= pid->level; i++) {
Pavel Emelyanov130f77e2007-10-18 23:40:11 -07002667 upid = &pid->numbers[i];
2668 proc_flush_task_mnt(upid->ns->proc_mnt, upid->nr,
Eric W. Biederman9fcc2d12007-11-14 17:00:07 -08002669 tgid ? tgid->numbers[i].nr : 0);
Pavel Emelyanov130f77e2007-10-18 23:40:11 -07002670 }
Pavel Emelyanov6f4e6432007-10-18 23:40:11 -07002671
2672 upid = &pid->numbers[pid->level];
2673 if (upid->nr == 1)
2674 pid_ns_release_proc(upid->ns);
Pavel Emelyanov60347f62007-10-18 23:40:03 -07002675}
2676
Adrian Bunk9711ef92006-12-06 20:38:31 -08002677static struct dentry *proc_pid_instantiate(struct inode *dir,
2678 struct dentry * dentry,
Eric Dumazetc5141e62007-05-08 00:26:15 -07002679 struct task_struct *task, const void *ptr)
Eric W. Biederman444ceed2006-10-02 02:18:49 -07002680{
2681 struct dentry *error = ERR_PTR(-ENOENT);
2682 struct inode *inode;
2683
Eric W. Biederman61a28782006-10-02 02:18:49 -07002684 inode = proc_pid_make_inode(dir->i_sb, task);
Eric W. Biederman444ceed2006-10-02 02:18:49 -07002685 if (!inode)
2686 goto out;
2687
2688 inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO;
2689 inode->i_op = &proc_tgid_base_inode_operations;
2690 inode->i_fop = &proc_tgid_base_operations;
2691 inode->i_flags|=S_IMMUTABLE;
Vegard Nossumaed54172008-06-05 22:46:53 -07002692
2693 inode->i_nlink = 2 + pid_entry_count_dirs(tgid_base_stuff,
2694 ARRAY_SIZE(tgid_base_stuff));
Eric W. Biederman444ceed2006-10-02 02:18:49 -07002695
2696 dentry->d_op = &pid_dentry_operations;
2697
2698 d_add(dentry, inode);
2699 /* Close the race of the process dying before we return the dentry */
2700 if (pid_revalidate(dentry, NULL))
2701 error = NULL;
2702out:
2703 return error;
2704}
2705
Linus Torvalds1da177e2005-04-16 15:20:36 -07002706struct dentry *proc_pid_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd)
2707{
Eric W. Biedermancd6a3ce2006-06-26 00:25:49 -07002708 struct dentry *result = ERR_PTR(-ENOENT);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002709 struct task_struct *task;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002710 unsigned tgid;
Pavel Emelyanovb4888932007-10-18 23:40:14 -07002711 struct pid_namespace *ns;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002712
Eric W. Biederman801199c2006-10-02 02:18:48 -07002713 result = proc_base_lookup(dir, dentry);
2714 if (!IS_ERR(result) || PTR_ERR(result) != -ENOENT)
2715 goto out;
2716
Linus Torvalds1da177e2005-04-16 15:20:36 -07002717 tgid = name_to_int(dentry);
2718 if (tgid == ~0U)
2719 goto out;
2720
Pavel Emelyanovb4888932007-10-18 23:40:14 -07002721 ns = dentry->d_sb->s_fs_info;
Eric W. Biedermande758732006-06-26 00:25:51 -07002722 rcu_read_lock();
Pavel Emelyanovb4888932007-10-18 23:40:14 -07002723 task = find_task_by_pid_ns(tgid, ns);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002724 if (task)
2725 get_task_struct(task);
Eric W. Biedermande758732006-06-26 00:25:51 -07002726 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002727 if (!task)
2728 goto out;
2729
Eric W. Biederman444ceed2006-10-02 02:18:49 -07002730 result = proc_pid_instantiate(dir, dentry, task, NULL);
Eric W. Biederman48e64842006-06-26 00:25:48 -07002731 put_task_struct(task);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002732out:
Eric W. Biedermancd6a3ce2006-06-26 00:25:49 -07002733 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002734}
2735
Linus Torvalds1da177e2005-04-16 15:20:36 -07002736/*
Eric W. Biederman0804ef42006-10-02 02:17:04 -07002737 * Find the first task with tgid >= tgid
Eric W. Biederman0bc58a92006-06-26 00:25:50 -07002738 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07002739 */
Eric W. Biederman19fd4bb2007-11-28 16:21:26 -08002740struct tgid_iter {
2741 unsigned int tgid;
Eric W. Biederman0804ef42006-10-02 02:17:04 -07002742 struct task_struct *task;
Eric W. Biederman19fd4bb2007-11-28 16:21:26 -08002743};
2744static struct tgid_iter next_tgid(struct pid_namespace *ns, struct tgid_iter iter)
2745{
Eric W. Biederman0804ef42006-10-02 02:17:04 -07002746 struct pid *pid;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002747
Eric W. Biederman19fd4bb2007-11-28 16:21:26 -08002748 if (iter.task)
2749 put_task_struct(iter.task);
Eric W. Biederman0804ef42006-10-02 02:17:04 -07002750 rcu_read_lock();
2751retry:
Eric W. Biederman19fd4bb2007-11-28 16:21:26 -08002752 iter.task = NULL;
2753 pid = find_ge_pid(iter.tgid, ns);
Eric W. Biederman0804ef42006-10-02 02:17:04 -07002754 if (pid) {
Eric W. Biederman19fd4bb2007-11-28 16:21:26 -08002755 iter.tgid = pid_nr_ns(pid, ns);
2756 iter.task = pid_task(pid, PIDTYPE_PID);
Eric W. Biederman0804ef42006-10-02 02:17:04 -07002757 /* What we to know is if the pid we have find is the
2758 * pid of a thread_group_leader. Testing for task
2759 * being a thread_group_leader is the obvious thing
2760 * todo but there is a window when it fails, due to
2761 * the pid transfer logic in de_thread.
2762 *
2763 * So we perform the straight forward test of seeing
2764 * if the pid we have found is the pid of a thread
2765 * group leader, and don't worry if the task we have
2766 * found doesn't happen to be a thread group leader.
2767 * As we don't care in the case of readdir.
2768 */
Eric W. Biederman19fd4bb2007-11-28 16:21:26 -08002769 if (!iter.task || !has_group_leader_pid(iter.task)) {
2770 iter.tgid += 1;
Eric W. Biederman0804ef42006-10-02 02:17:04 -07002771 goto retry;
Eric W. Biederman19fd4bb2007-11-28 16:21:26 -08002772 }
2773 get_task_struct(iter.task);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002774 }
Eric W. Biederman454cc102006-06-26 00:25:51 -07002775 rcu_read_unlock();
Eric W. Biederman19fd4bb2007-11-28 16:21:26 -08002776 return iter;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002777}
2778
Eric W. Biederman7bcd6b02006-10-02 02:18:56 -07002779#define TGID_OFFSET (FIRST_PROCESS_ENTRY + ARRAY_SIZE(proc_base_stuff))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002780
Eric W. Biederman61a28782006-10-02 02:18:49 -07002781static int proc_pid_fill_cache(struct file *filp, void *dirent, filldir_t filldir,
Eric W. Biederman19fd4bb2007-11-28 16:21:26 -08002782 struct tgid_iter iter)
Eric W. Biederman61a28782006-10-02 02:18:49 -07002783{
2784 char name[PROC_NUMBUF];
Eric W. Biederman19fd4bb2007-11-28 16:21:26 -08002785 int len = snprintf(name, sizeof(name), "%d", iter.tgid);
Eric W. Biederman61a28782006-10-02 02:18:49 -07002786 return proc_fill_cache(filp, dirent, filldir, name, len,
Eric W. Biederman19fd4bb2007-11-28 16:21:26 -08002787 proc_pid_instantiate, iter.task, NULL);
Eric W. Biederman61a28782006-10-02 02:18:49 -07002788}
2789
Linus Torvalds1da177e2005-04-16 15:20:36 -07002790/* for the /proc/ directory itself, after non-process stuff has been done */
2791int proc_pid_readdir(struct file * filp, void * dirent, filldir_t filldir)
2792{
Linus Torvalds1da177e2005-04-16 15:20:36 -07002793 unsigned int nr = filp->f_pos - FIRST_PROCESS_ENTRY;
Josef "Jeff" Sipek2fddfee2006-12-08 02:36:36 -08002794 struct task_struct *reaper = get_proc_task(filp->f_path.dentry->d_inode);
Eric W. Biederman19fd4bb2007-11-28 16:21:26 -08002795 struct tgid_iter iter;
Pavel Emelyanovb4888932007-10-18 23:40:14 -07002796 struct pid_namespace *ns;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002797
Eric W. Biederman61a28782006-10-02 02:18:49 -07002798 if (!reaper)
2799 goto out_no_task;
2800
Eric W. Biederman7bcd6b02006-10-02 02:18:56 -07002801 for (; nr < ARRAY_SIZE(proc_base_stuff); filp->f_pos++, nr++) {
Eric Dumazetc5141e62007-05-08 00:26:15 -07002802 const struct pid_entry *p = &proc_base_stuff[nr];
Eric W. Biederman61a28782006-10-02 02:18:49 -07002803 if (proc_base_fill_cache(filp, dirent, filldir, reaper, p) < 0)
Eric W. Biederman801199c2006-10-02 02:18:48 -07002804 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002805 }
2806
Pavel Emelyanovb4888932007-10-18 23:40:14 -07002807 ns = filp->f_dentry->d_sb->s_fs_info;
Eric W. Biederman19fd4bb2007-11-28 16:21:26 -08002808 iter.task = NULL;
2809 iter.tgid = filp->f_pos - TGID_OFFSET;
2810 for (iter = next_tgid(ns, iter);
2811 iter.task;
2812 iter.tgid += 1, iter = next_tgid(ns, iter)) {
2813 filp->f_pos = iter.tgid + TGID_OFFSET;
2814 if (proc_pid_fill_cache(filp, dirent, filldir, iter) < 0) {
2815 put_task_struct(iter.task);
Eric W. Biederman0804ef42006-10-02 02:17:04 -07002816 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002817 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002818 }
Eric W. Biederman0804ef42006-10-02 02:17:04 -07002819 filp->f_pos = PID_MAX_LIMIT + TGID_OFFSET;
2820out:
Eric W. Biederman61a28782006-10-02 02:18:49 -07002821 put_task_struct(reaper);
2822out_no_task:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002823 return 0;
2824}
2825
Eric W. Biederman0bc58a92006-06-26 00:25:50 -07002826/*
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002827 * Tasks
2828 */
Eric Dumazetc5141e62007-05-08 00:26:15 -07002829static const struct pid_entry tid_base_stuff[] = {
Alexey Dobriyan631f9c12008-11-10 01:32:52 +03002830 DIR("fd", S_IRUSR|S_IXUSR, proc_fd_inode_operations, proc_fd_operations),
2831 DIR("fdinfo", S_IRUSR|S_IXUSR, proc_fdinfo_inode_operations, proc_fd_operations),
2832 REG("environ", S_IRUSR, proc_environ_operations),
2833 INF("auxv", S_IRUSR, proc_pid_auxv),
2834 ONE("status", S_IRUGO, proc_pid_status),
2835 ONE("personality", S_IRUSR, proc_pid_personality),
2836 INF("limits", S_IRUSR, proc_pid_limits),
Ingo Molnar43ae34c2007-07-09 18:52:00 +02002837#ifdef CONFIG_SCHED_DEBUG
Alexey Dobriyan631f9c12008-11-10 01:32:52 +03002838 REG("sched", S_IRUGO|S_IWUSR, proc_pid_sched_operations),
Ingo Molnar43ae34c2007-07-09 18:52:00 +02002839#endif
Roland McGrathebcb6732008-07-25 19:46:00 -07002840#ifdef CONFIG_HAVE_ARCH_TRACEHOOK
Alexey Dobriyan631f9c12008-11-10 01:32:52 +03002841 INF("syscall", S_IRUSR, proc_pid_syscall),
Roland McGrathebcb6732008-07-25 19:46:00 -07002842#endif
Alexey Dobriyan631f9c12008-11-10 01:32:52 +03002843 INF("cmdline", S_IRUGO, proc_pid_cmdline),
2844 ONE("stat", S_IRUGO, proc_tid_stat),
2845 ONE("statm", S_IRUGO, proc_pid_statm),
2846 REG("maps", S_IRUGO, proc_maps_operations),
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002847#ifdef CONFIG_NUMA
Alexey Dobriyan631f9c12008-11-10 01:32:52 +03002848 REG("numa_maps", S_IRUGO, proc_numa_maps_operations),
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002849#endif
Alexey Dobriyan631f9c12008-11-10 01:32:52 +03002850 REG("mem", S_IRUSR|S_IWUSR, proc_mem_operations),
2851 LNK("cwd", proc_cwd_link),
2852 LNK("root", proc_root_link),
2853 LNK("exe", proc_exe_link),
2854 REG("mounts", S_IRUGO, proc_mounts_operations),
2855 REG("mountinfo", S_IRUGO, proc_mountinfo_operations),
Matt Mackall1e883282008-02-04 22:29:07 -08002856#ifdef CONFIG_PROC_PAGE_MONITOR
Alexey Dobriyan631f9c12008-11-10 01:32:52 +03002857 REG("clear_refs", S_IWUSR, proc_clear_refs_operations),
2858 REG("smaps", S_IRUGO, proc_smaps_operations),
2859 REG("pagemap", S_IRUSR, proc_pagemap_operations),
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002860#endif
2861#ifdef CONFIG_SECURITY
Alexey Dobriyan631f9c12008-11-10 01:32:52 +03002862 DIR("attr", S_IRUGO|S_IXUGO, proc_attr_dir_inode_operations, proc_attr_dir_operations),
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002863#endif
2864#ifdef CONFIG_KALLSYMS
Alexey Dobriyan631f9c12008-11-10 01:32:52 +03002865 INF("wchan", S_IRUGO, proc_pid_wchan),
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002866#endif
Ken Chen2ec220e2008-11-10 11:26:08 +03002867#ifdef CONFIG_STACKTRACE
2868 ONE("stack", S_IRUSR, proc_pid_stack),
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002869#endif
2870#ifdef CONFIG_SCHEDSTATS
Alexey Dobriyan631f9c12008-11-10 01:32:52 +03002871 INF("schedstat", S_IRUGO, proc_pid_schedstat),
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002872#endif
Arjan van de Ven97455122008-01-25 21:08:34 +01002873#ifdef CONFIG_LATENCYTOP
Alexey Dobriyan631f9c12008-11-10 01:32:52 +03002874 REG("latency", S_IRUGO, proc_lstats_operations),
Arjan van de Ven97455122008-01-25 21:08:34 +01002875#endif
Paul Menage8793d852007-10-18 23:39:39 -07002876#ifdef CONFIG_PROC_PID_CPUSET
Alexey Dobriyan631f9c12008-11-10 01:32:52 +03002877 REG("cpuset", S_IRUGO, proc_cpuset_operations),
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002878#endif
Paul Menagea4243162007-10-18 23:39:35 -07002879#ifdef CONFIG_CGROUPS
Alexey Dobriyan631f9c12008-11-10 01:32:52 +03002880 REG("cgroup", S_IRUGO, proc_cgroup_operations),
Paul Menagea4243162007-10-18 23:39:35 -07002881#endif
Alexey Dobriyan631f9c12008-11-10 01:32:52 +03002882 INF("oom_score", S_IRUGO, proc_oom_score),
2883 REG("oom_adj", S_IRUGO|S_IWUSR, proc_oom_adjust_operations),
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002884#ifdef CONFIG_AUDITSYSCALL
Alexey Dobriyan631f9c12008-11-10 01:32:52 +03002885 REG("loginuid", S_IWUSR|S_IRUGO, proc_loginuid_operations),
2886 REG("sessionid", S_IRUSR, proc_sessionid_operations),
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002887#endif
Akinobu Mitaf4f154f2006-12-08 02:39:47 -08002888#ifdef CONFIG_FAULT_INJECTION
Alexey Dobriyan631f9c12008-11-10 01:32:52 +03002889 REG("make-it-fail", S_IRUGO|S_IWUSR, proc_fault_inject_operations),
Akinobu Mitaf4f154f2006-12-08 02:39:47 -08002890#endif
Andrea Righi297c5d92008-07-25 01:48:49 -07002891#ifdef CONFIG_TASK_IO_ACCOUNTING
Alexey Dobriyan631f9c12008-11-10 01:32:52 +03002892 INF("io", S_IRUGO, proc_tid_io_accounting),
Andrea Righi297c5d92008-07-25 01:48:49 -07002893#endif
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002894};
2895
2896static int proc_tid_base_readdir(struct file * filp,
2897 void * dirent, filldir_t filldir)
2898{
2899 return proc_pident_readdir(filp,dirent,filldir,
2900 tid_base_stuff,ARRAY_SIZE(tid_base_stuff));
2901}
2902
2903static struct dentry *proc_tid_base_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd){
Eric W. Biederman7bcd6b02006-10-02 02:18:56 -07002904 return proc_pident_lookup(dir, dentry,
2905 tid_base_stuff, ARRAY_SIZE(tid_base_stuff));
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002906}
2907
Arjan van de Ven00977a52007-02-12 00:55:34 -08002908static const struct file_operations proc_tid_base_operations = {
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002909 .read = generic_read_dir,
2910 .readdir = proc_tid_base_readdir,
2911};
2912
Arjan van de Venc5ef1c42007-02-12 00:55:40 -08002913static const struct inode_operations proc_tid_base_inode_operations = {
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002914 .lookup = proc_tid_base_lookup,
2915 .getattr = pid_getattr,
2916 .setattr = proc_setattr,
2917};
2918
Eric W. Biederman444ceed2006-10-02 02:18:49 -07002919static struct dentry *proc_task_instantiate(struct inode *dir,
Eric Dumazetc5141e62007-05-08 00:26:15 -07002920 struct dentry *dentry, struct task_struct *task, const void *ptr)
Eric W. Biederman444ceed2006-10-02 02:18:49 -07002921{
2922 struct dentry *error = ERR_PTR(-ENOENT);
2923 struct inode *inode;
Eric W. Biederman61a28782006-10-02 02:18:49 -07002924 inode = proc_pid_make_inode(dir->i_sb, task);
Eric W. Biederman444ceed2006-10-02 02:18:49 -07002925
2926 if (!inode)
2927 goto out;
2928 inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO;
2929 inode->i_op = &proc_tid_base_inode_operations;
2930 inode->i_fop = &proc_tid_base_operations;
2931 inode->i_flags|=S_IMMUTABLE;
Vegard Nossumaed54172008-06-05 22:46:53 -07002932
2933 inode->i_nlink = 2 + pid_entry_count_dirs(tid_base_stuff,
2934 ARRAY_SIZE(tid_base_stuff));
Eric W. Biederman444ceed2006-10-02 02:18:49 -07002935
2936 dentry->d_op = &pid_dentry_operations;
2937
2938 d_add(dentry, inode);
2939 /* Close the race of the process dying before we return the dentry */
2940 if (pid_revalidate(dentry, NULL))
2941 error = NULL;
2942out:
2943 return error;
2944}
2945
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002946static struct dentry *proc_task_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd)
2947{
2948 struct dentry *result = ERR_PTR(-ENOENT);
2949 struct task_struct *task;
2950 struct task_struct *leader = get_proc_task(dir);
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002951 unsigned tid;
Pavel Emelyanovb4888932007-10-18 23:40:14 -07002952 struct pid_namespace *ns;
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002953
2954 if (!leader)
2955 goto out_no_task;
2956
2957 tid = name_to_int(dentry);
2958 if (tid == ~0U)
2959 goto out;
2960
Pavel Emelyanovb4888932007-10-18 23:40:14 -07002961 ns = dentry->d_sb->s_fs_info;
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002962 rcu_read_lock();
Pavel Emelyanovb4888932007-10-18 23:40:14 -07002963 task = find_task_by_pid_ns(tid, ns);
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002964 if (task)
2965 get_task_struct(task);
2966 rcu_read_unlock();
2967 if (!task)
2968 goto out;
Pavel Emelyanovbac0abd2007-10-18 23:40:18 -07002969 if (!same_thread_group(leader, task))
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002970 goto out_drop_task;
2971
Eric W. Biederman444ceed2006-10-02 02:18:49 -07002972 result = proc_task_instantiate(dir, dentry, task, NULL);
Eric W. Biederman28a6d672006-10-02 02:17:05 -07002973out_drop_task:
2974 put_task_struct(task);
2975out:
2976 put_task_struct(leader);
2977out_no_task:
2978 return result;
2979}
2980
2981/*
Eric W. Biederman0bc58a92006-06-26 00:25:50 -07002982 * Find the first tid of a thread group to return to user space.
2983 *
2984 * Usually this is just the thread group leader, but if the users
2985 * buffer was too small or there was a seek into the middle of the
2986 * directory we have more work todo.
2987 *
2988 * In the case of a short read we start with find_task_by_pid.
2989 *
2990 * In the case of a seek we start with the leader and walk nr
2991 * threads past it.
2992 */
Eric W. Biedermancc288732006-06-26 00:26:01 -07002993static struct task_struct *first_tid(struct task_struct *leader,
Pavel Emelyanovb4888932007-10-18 23:40:14 -07002994 int tid, int nr, struct pid_namespace *ns)
Eric W. Biederman0bc58a92006-06-26 00:25:50 -07002995{
Oleg Nesterova872ff02006-06-26 00:26:01 -07002996 struct task_struct *pos;
Eric W. Biederman0bc58a92006-06-26 00:25:50 -07002997
Eric W. Biedermancc288732006-06-26 00:26:01 -07002998 rcu_read_lock();
Eric W. Biederman0bc58a92006-06-26 00:25:50 -07002999 /* Attempt to start with the pid of a thread */
3000 if (tid && (nr > 0)) {
Pavel Emelyanovb4888932007-10-18 23:40:14 -07003001 pos = find_task_by_pid_ns(tid, ns);
Oleg Nesterova872ff02006-06-26 00:26:01 -07003002 if (pos && (pos->group_leader == leader))
3003 goto found;
Eric W. Biederman0bc58a92006-06-26 00:25:50 -07003004 }
3005
3006 /* If nr exceeds the number of threads there is nothing todo */
Eric W. Biederman0bc58a92006-06-26 00:25:50 -07003007 pos = NULL;
Oleg Nesterova872ff02006-06-26 00:26:01 -07003008 if (nr && nr >= get_nr_threads(leader))
3009 goto out;
3010
3011 /* If we haven't found our starting place yet start
3012 * with the leader and walk nr threads forward.
3013 */
3014 for (pos = leader; nr > 0; --nr) {
3015 pos = next_thread(pos);
3016 if (pos == leader) {
3017 pos = NULL;
3018 goto out;
3019 }
3020 }
3021found:
3022 get_task_struct(pos);
3023out:
Eric W. Biedermancc288732006-06-26 00:26:01 -07003024 rcu_read_unlock();
Eric W. Biederman0bc58a92006-06-26 00:25:50 -07003025 return pos;
3026}
3027
3028/*
3029 * Find the next thread in the thread list.
3030 * Return NULL if there is an error or no next thread.
3031 *
3032 * The reference to the input task_struct is released.
3033 */
3034static struct task_struct *next_tid(struct task_struct *start)
3035{
Oleg Nesterovc1df7fb2006-06-26 00:26:02 -07003036 struct task_struct *pos = NULL;
Eric W. Biedermancc288732006-06-26 00:26:01 -07003037 rcu_read_lock();
Oleg Nesterovc1df7fb2006-06-26 00:26:02 -07003038 if (pid_alive(start)) {
Eric W. Biederman0bc58a92006-06-26 00:25:50 -07003039 pos = next_thread(start);
Oleg Nesterovc1df7fb2006-06-26 00:26:02 -07003040 if (thread_group_leader(pos))
3041 pos = NULL;
3042 else
3043 get_task_struct(pos);
3044 }
Eric W. Biedermancc288732006-06-26 00:26:01 -07003045 rcu_read_unlock();
Eric W. Biederman0bc58a92006-06-26 00:25:50 -07003046 put_task_struct(start);
3047 return pos;
3048}
3049
Eric W. Biederman61a28782006-10-02 02:18:49 -07003050static int proc_task_fill_cache(struct file *filp, void *dirent, filldir_t filldir,
3051 struct task_struct *task, int tid)
3052{
3053 char name[PROC_NUMBUF];
3054 int len = snprintf(name, sizeof(name), "%d", tid);
3055 return proc_fill_cache(filp, dirent, filldir, name, len,
3056 proc_task_instantiate, task, NULL);
3057}
3058
Linus Torvalds1da177e2005-04-16 15:20:36 -07003059/* for the /proc/TGID/task/ directories */
3060static int proc_task_readdir(struct file * filp, void * dirent, filldir_t filldir)
3061{
Josef "Jeff" Sipek2fddfee2006-12-08 02:36:36 -08003062 struct dentry *dentry = filp->f_path.dentry;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003063 struct inode *inode = dentry->d_inode;
Guillaume Chazarain7d895242007-01-31 23:48:14 -08003064 struct task_struct *leader = NULL;
Eric W. Biederman0bc58a92006-06-26 00:25:50 -07003065 struct task_struct *task;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003066 int retval = -ENOENT;
3067 ino_t ino;
Eric W. Biederman0bc58a92006-06-26 00:25:50 -07003068 int tid;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003069 unsigned long pos = filp->f_pos; /* avoiding "long long" filp->f_pos */
Pavel Emelyanovb4888932007-10-18 23:40:14 -07003070 struct pid_namespace *ns;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003071
Guillaume Chazarain7d895242007-01-31 23:48:14 -08003072 task = get_proc_task(inode);
3073 if (!task)
3074 goto out_no_task;
3075 rcu_read_lock();
3076 if (pid_alive(task)) {
3077 leader = task->group_leader;
3078 get_task_struct(leader);
3079 }
3080 rcu_read_unlock();
3081 put_task_struct(task);
Eric W. Biederman99f89552006-06-26 00:25:55 -07003082 if (!leader)
3083 goto out_no_task;
Linus Torvalds1da177e2005-04-16 15:20:36 -07003084 retval = 0;
3085
3086 switch (pos) {
3087 case 0:
3088 ino = inode->i_ino;
3089 if (filldir(dirent, ".", 1, pos, ino, DT_DIR) < 0)
3090 goto out;
3091 pos++;
3092 /* fall through */
3093 case 1:
3094 ino = parent_ino(dentry);
3095 if (filldir(dirent, "..", 2, pos, ino, DT_DIR) < 0)
3096 goto out;
3097 pos++;
3098 /* fall through */
3099 }
3100
Eric W. Biederman0bc58a92006-06-26 00:25:50 -07003101 /* f_version caches the tgid value that the last readdir call couldn't
3102 * return. lseek aka telldir automagically resets f_version to 0.
3103 */
Pavel Emelyanovb4888932007-10-18 23:40:14 -07003104 ns = filp->f_dentry->d_sb->s_fs_info;
Mathieu Desnoyers2b47c362007-10-16 23:27:21 -07003105 tid = (int)filp->f_version;
Eric W. Biederman0bc58a92006-06-26 00:25:50 -07003106 filp->f_version = 0;
Pavel Emelyanovb4888932007-10-18 23:40:14 -07003107 for (task = first_tid(leader, tid, pos - 2, ns);
Eric W. Biederman0bc58a92006-06-26 00:25:50 -07003108 task;
3109 task = next_tid(task), pos++) {
Pavel Emelyanovb4888932007-10-18 23:40:14 -07003110 tid = task_pid_nr_ns(task, ns);
Eric W. Biederman61a28782006-10-02 02:18:49 -07003111 if (proc_task_fill_cache(filp, dirent, filldir, task, tid) < 0) {
Eric W. Biederman0bc58a92006-06-26 00:25:50 -07003112 /* returning this tgid failed, save it as the first
3113 * pid for the next readir call */
Mathieu Desnoyers2b47c362007-10-16 23:27:21 -07003114 filp->f_version = (u64)tid;
Eric W. Biederman0bc58a92006-06-26 00:25:50 -07003115 put_task_struct(task);
Linus Torvalds1da177e2005-04-16 15:20:36 -07003116 break;
Eric W. Biederman0bc58a92006-06-26 00:25:50 -07003117 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07003118 }
3119out:
3120 filp->f_pos = pos;
Eric W. Biederman99f89552006-06-26 00:25:55 -07003121 put_task_struct(leader);
3122out_no_task:
Linus Torvalds1da177e2005-04-16 15:20:36 -07003123 return retval;
3124}
Eric W. Biederman6e66b522006-06-26 00:25:47 -07003125
3126static int proc_task_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
3127{
3128 struct inode *inode = dentry->d_inode;
Eric W. Biederman99f89552006-06-26 00:25:55 -07003129 struct task_struct *p = get_proc_task(inode);
Eric W. Biederman6e66b522006-06-26 00:25:47 -07003130 generic_fillattr(inode, stat);
3131
Eric W. Biederman99f89552006-06-26 00:25:55 -07003132 if (p) {
Eric W. Biederman99f89552006-06-26 00:25:55 -07003133 stat->nlink += get_nr_threads(p);
Eric W. Biederman99f89552006-06-26 00:25:55 -07003134 put_task_struct(p);
Eric W. Biederman6e66b522006-06-26 00:25:47 -07003135 }
3136
3137 return 0;
3138}
Eric W. Biederman28a6d672006-10-02 02:17:05 -07003139
Arjan van de Venc5ef1c42007-02-12 00:55:40 -08003140static const struct inode_operations proc_task_inode_operations = {
Eric W. Biederman28a6d672006-10-02 02:17:05 -07003141 .lookup = proc_task_lookup,
3142 .getattr = proc_task_getattr,
3143 .setattr = proc_setattr,
3144};
3145
Arjan van de Ven00977a52007-02-12 00:55:34 -08003146static const struct file_operations proc_task_operations = {
Eric W. Biederman28a6d672006-10-02 02:17:05 -07003147 .read = generic_read_dir,
3148 .readdir = proc_task_readdir,
3149};