blob: fb34f88a4a747abc6251a8895c31ec13dceb3a1f [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
52#include <linux/config.h>
53#include <linux/errno.h>
54#include <linux/time.h>
55#include <linux/proc_fs.h>
56#include <linux/stat.h>
57#include <linux/init.h>
58#include <linux/file.h>
59#include <linux/string.h>
60#include <linux/seq_file.h>
61#include <linux/namei.h>
62#include <linux/namespace.h>
63#include <linux/mm.h>
64#include <linux/smp_lock.h>
Dipankar Sarmab8359962005-09-09 13:04:14 -070065#include <linux/rcupdate.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070066#include <linux/kallsyms.h>
67#include <linux/mount.h>
68#include <linux/security.h>
69#include <linux/ptrace.h>
70#include <linux/seccomp.h>
71#include <linux/cpuset.h>
72#include <linux/audit.h>
73#include "internal.h"
74
75/*
76 * For hysterical raisins we keep the same inumbers as in the old procfs.
77 * Feel free to change the macro below - just keep the range distinct from
78 * inumbers of the rest of procfs (currently those are in 0x0000--0xffff).
79 * As soon as we'll get a separate superblock we will be able to forget
80 * about magical ranges too.
81 */
82
83#define fake_ino(pid,ino) (((pid)<<16)|(ino))
84
85enum pid_directory_inos {
86 PROC_TGID_INO = 2,
87 PROC_TGID_TASK,
88 PROC_TGID_STATUS,
89 PROC_TGID_MEM,
90#ifdef CONFIG_SECCOMP
91 PROC_TGID_SECCOMP,
92#endif
93 PROC_TGID_CWD,
94 PROC_TGID_ROOT,
95 PROC_TGID_EXE,
96 PROC_TGID_FD,
97 PROC_TGID_ENVIRON,
98 PROC_TGID_AUXV,
99 PROC_TGID_CMDLINE,
100 PROC_TGID_STAT,
101 PROC_TGID_STATM,
102 PROC_TGID_MAPS,
Christoph Lameter6e21c8f2005-09-03 15:54:45 -0700103 PROC_TGID_NUMA_MAPS,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104 PROC_TGID_MOUNTS,
105 PROC_TGID_WCHAN,
Mauricio Line070ad42005-09-03 15:55:10 -0700106 PROC_TGID_SMAPS,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107#ifdef CONFIG_SCHEDSTATS
108 PROC_TGID_SCHEDSTAT,
109#endif
110#ifdef CONFIG_CPUSETS
111 PROC_TGID_CPUSET,
112#endif
113#ifdef CONFIG_SECURITY
114 PROC_TGID_ATTR,
115 PROC_TGID_ATTR_CURRENT,
116 PROC_TGID_ATTR_PREV,
117 PROC_TGID_ATTR_EXEC,
118 PROC_TGID_ATTR_FSCREATE,
119#endif
120#ifdef CONFIG_AUDITSYSCALL
121 PROC_TGID_LOGINUID,
122#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123 PROC_TGID_OOM_SCORE,
124 PROC_TGID_OOM_ADJUST,
125 PROC_TID_INO,
126 PROC_TID_STATUS,
127 PROC_TID_MEM,
128#ifdef CONFIG_SECCOMP
129 PROC_TID_SECCOMP,
130#endif
131 PROC_TID_CWD,
132 PROC_TID_ROOT,
133 PROC_TID_EXE,
134 PROC_TID_FD,
135 PROC_TID_ENVIRON,
136 PROC_TID_AUXV,
137 PROC_TID_CMDLINE,
138 PROC_TID_STAT,
139 PROC_TID_STATM,
140 PROC_TID_MAPS,
Christoph Lameter6e21c8f2005-09-03 15:54:45 -0700141 PROC_TID_NUMA_MAPS,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142 PROC_TID_MOUNTS,
143 PROC_TID_WCHAN,
Mauricio Line070ad42005-09-03 15:55:10 -0700144 PROC_TID_SMAPS,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145#ifdef CONFIG_SCHEDSTATS
146 PROC_TID_SCHEDSTAT,
147#endif
148#ifdef CONFIG_CPUSETS
149 PROC_TID_CPUSET,
150#endif
151#ifdef CONFIG_SECURITY
152 PROC_TID_ATTR,
153 PROC_TID_ATTR_CURRENT,
154 PROC_TID_ATTR_PREV,
155 PROC_TID_ATTR_EXEC,
156 PROC_TID_ATTR_FSCREATE,
157#endif
158#ifdef CONFIG_AUDITSYSCALL
159 PROC_TID_LOGINUID,
160#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161 PROC_TID_OOM_SCORE,
162 PROC_TID_OOM_ADJUST,
Miklos Szeredi5e21ccb2005-09-06 15:18:23 -0700163
164 /* Add new entries before this */
165 PROC_TID_FD_DIR = 0x8000, /* 0x8000-0xffff */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166};
167
168struct pid_entry {
169 int type;
170 int len;
171 char *name;
172 mode_t mode;
173};
174
175#define E(type,name,mode) {(type),sizeof(name)-1,(name),(mode)}
176
177static struct pid_entry tgid_base_stuff[] = {
178 E(PROC_TGID_TASK, "task", S_IFDIR|S_IRUGO|S_IXUGO),
179 E(PROC_TGID_FD, "fd", S_IFDIR|S_IRUSR|S_IXUSR),
180 E(PROC_TGID_ENVIRON, "environ", S_IFREG|S_IRUSR),
181 E(PROC_TGID_AUXV, "auxv", S_IFREG|S_IRUSR),
182 E(PROC_TGID_STATUS, "status", S_IFREG|S_IRUGO),
183 E(PROC_TGID_CMDLINE, "cmdline", S_IFREG|S_IRUGO),
184 E(PROC_TGID_STAT, "stat", S_IFREG|S_IRUGO),
185 E(PROC_TGID_STATM, "statm", S_IFREG|S_IRUGO),
186 E(PROC_TGID_MAPS, "maps", S_IFREG|S_IRUGO),
Christoph Lameter6e21c8f2005-09-03 15:54:45 -0700187#ifdef CONFIG_NUMA
188 E(PROC_TGID_NUMA_MAPS, "numa_maps", S_IFREG|S_IRUGO),
189#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190 E(PROC_TGID_MEM, "mem", S_IFREG|S_IRUSR|S_IWUSR),
191#ifdef CONFIG_SECCOMP
192 E(PROC_TGID_SECCOMP, "seccomp", S_IFREG|S_IRUSR|S_IWUSR),
193#endif
194 E(PROC_TGID_CWD, "cwd", S_IFLNK|S_IRWXUGO),
195 E(PROC_TGID_ROOT, "root", S_IFLNK|S_IRWXUGO),
196 E(PROC_TGID_EXE, "exe", S_IFLNK|S_IRWXUGO),
197 E(PROC_TGID_MOUNTS, "mounts", S_IFREG|S_IRUGO),
Mauricio Line070ad42005-09-03 15:55:10 -0700198 E(PROC_TGID_SMAPS, "smaps", S_IFREG|S_IRUGO),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199#ifdef CONFIG_SECURITY
200 E(PROC_TGID_ATTR, "attr", S_IFDIR|S_IRUGO|S_IXUGO),
201#endif
202#ifdef CONFIG_KALLSYMS
203 E(PROC_TGID_WCHAN, "wchan", S_IFREG|S_IRUGO),
204#endif
205#ifdef CONFIG_SCHEDSTATS
206 E(PROC_TGID_SCHEDSTAT, "schedstat", S_IFREG|S_IRUGO),
207#endif
208#ifdef CONFIG_CPUSETS
209 E(PROC_TGID_CPUSET, "cpuset", S_IFREG|S_IRUGO),
210#endif
211 E(PROC_TGID_OOM_SCORE, "oom_score",S_IFREG|S_IRUGO),
212 E(PROC_TGID_OOM_ADJUST,"oom_adj", S_IFREG|S_IRUGO|S_IWUSR),
213#ifdef CONFIG_AUDITSYSCALL
214 E(PROC_TGID_LOGINUID, "loginuid", S_IFREG|S_IWUSR|S_IRUGO),
215#endif
216 {0,0,NULL,0}
217};
218static struct pid_entry tid_base_stuff[] = {
219 E(PROC_TID_FD, "fd", S_IFDIR|S_IRUSR|S_IXUSR),
220 E(PROC_TID_ENVIRON, "environ", S_IFREG|S_IRUSR),
221 E(PROC_TID_AUXV, "auxv", S_IFREG|S_IRUSR),
222 E(PROC_TID_STATUS, "status", S_IFREG|S_IRUGO),
223 E(PROC_TID_CMDLINE, "cmdline", S_IFREG|S_IRUGO),
224 E(PROC_TID_STAT, "stat", S_IFREG|S_IRUGO),
225 E(PROC_TID_STATM, "statm", S_IFREG|S_IRUGO),
226 E(PROC_TID_MAPS, "maps", S_IFREG|S_IRUGO),
Christoph Lameter6e21c8f2005-09-03 15:54:45 -0700227#ifdef CONFIG_NUMA
228 E(PROC_TID_NUMA_MAPS, "numa_maps", S_IFREG|S_IRUGO),
229#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230 E(PROC_TID_MEM, "mem", S_IFREG|S_IRUSR|S_IWUSR),
231#ifdef CONFIG_SECCOMP
232 E(PROC_TID_SECCOMP, "seccomp", S_IFREG|S_IRUSR|S_IWUSR),
233#endif
234 E(PROC_TID_CWD, "cwd", S_IFLNK|S_IRWXUGO),
235 E(PROC_TID_ROOT, "root", S_IFLNK|S_IRWXUGO),
236 E(PROC_TID_EXE, "exe", S_IFLNK|S_IRWXUGO),
237 E(PROC_TID_MOUNTS, "mounts", S_IFREG|S_IRUGO),
Mauricio Line070ad42005-09-03 15:55:10 -0700238 E(PROC_TID_SMAPS, "smaps", S_IFREG|S_IRUGO),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239#ifdef CONFIG_SECURITY
240 E(PROC_TID_ATTR, "attr", S_IFDIR|S_IRUGO|S_IXUGO),
241#endif
242#ifdef CONFIG_KALLSYMS
243 E(PROC_TID_WCHAN, "wchan", S_IFREG|S_IRUGO),
244#endif
245#ifdef CONFIG_SCHEDSTATS
246 E(PROC_TID_SCHEDSTAT, "schedstat",S_IFREG|S_IRUGO),
247#endif
248#ifdef CONFIG_CPUSETS
249 E(PROC_TID_CPUSET, "cpuset", S_IFREG|S_IRUGO),
250#endif
251 E(PROC_TID_OOM_SCORE, "oom_score",S_IFREG|S_IRUGO),
252 E(PROC_TID_OOM_ADJUST, "oom_adj", S_IFREG|S_IRUGO|S_IWUSR),
253#ifdef CONFIG_AUDITSYSCALL
254 E(PROC_TID_LOGINUID, "loginuid", S_IFREG|S_IWUSR|S_IRUGO),
255#endif
256 {0,0,NULL,0}
257};
258
259#ifdef CONFIG_SECURITY
260static struct pid_entry tgid_attr_stuff[] = {
261 E(PROC_TGID_ATTR_CURRENT, "current", S_IFREG|S_IRUGO|S_IWUGO),
262 E(PROC_TGID_ATTR_PREV, "prev", S_IFREG|S_IRUGO),
263 E(PROC_TGID_ATTR_EXEC, "exec", S_IFREG|S_IRUGO|S_IWUGO),
264 E(PROC_TGID_ATTR_FSCREATE, "fscreate", S_IFREG|S_IRUGO|S_IWUGO),
265 {0,0,NULL,0}
266};
267static struct pid_entry tid_attr_stuff[] = {
268 E(PROC_TID_ATTR_CURRENT, "current", S_IFREG|S_IRUGO|S_IWUGO),
269 E(PROC_TID_ATTR_PREV, "prev", S_IFREG|S_IRUGO),
270 E(PROC_TID_ATTR_EXEC, "exec", S_IFREG|S_IRUGO|S_IWUGO),
271 E(PROC_TID_ATTR_FSCREATE, "fscreate", S_IFREG|S_IRUGO|S_IWUGO),
272 {0,0,NULL,0}
273};
274#endif
275
276#undef E
277
278static int proc_fd_link(struct inode *inode, struct dentry **dentry, struct vfsmount **mnt)
279{
280 struct task_struct *task = proc_task(inode);
281 struct files_struct *files;
282 struct file *file;
283 int fd = proc_type(inode) - PROC_TID_FD_DIR;
284
285 files = get_files_struct(task);
286 if (files) {
Dipankar Sarmab8359962005-09-09 13:04:14 -0700287 rcu_read_lock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288 file = fcheck_files(files, fd);
289 if (file) {
290 *mnt = mntget(file->f_vfsmnt);
291 *dentry = dget(file->f_dentry);
Dipankar Sarmab8359962005-09-09 13:04:14 -0700292 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293 put_files_struct(files);
294 return 0;
295 }
Dipankar Sarmab8359962005-09-09 13:04:14 -0700296 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297 put_files_struct(files);
298 }
299 return -ENOENT;
300}
301
Miklos Szeredi0494f6e2005-09-06 15:18:22 -0700302static struct fs_struct *get_fs_struct(struct task_struct *task)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303{
304 struct fs_struct *fs;
Miklos Szeredi0494f6e2005-09-06 15:18:22 -0700305 task_lock(task);
306 fs = task->fs;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307 if(fs)
308 atomic_inc(&fs->count);
Miklos Szeredi0494f6e2005-09-06 15:18:22 -0700309 task_unlock(task);
310 return fs;
311}
312
313static int proc_cwd_link(struct inode *inode, struct dentry **dentry, struct vfsmount **mnt)
314{
315 struct fs_struct *fs = get_fs_struct(proc_task(inode));
316 int result = -ENOENT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317 if (fs) {
318 read_lock(&fs->lock);
319 *mnt = mntget(fs->pwdmnt);
320 *dentry = dget(fs->pwd);
321 read_unlock(&fs->lock);
322 result = 0;
323 put_fs_struct(fs);
324 }
325 return result;
326}
327
328static int proc_root_link(struct inode *inode, struct dentry **dentry, struct vfsmount **mnt)
329{
Miklos Szeredi0494f6e2005-09-06 15:18:22 -0700330 struct fs_struct *fs = get_fs_struct(proc_task(inode));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331 int result = -ENOENT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332 if (fs) {
333 read_lock(&fs->lock);
334 *mnt = mntget(fs->rootmnt);
335 *dentry = dget(fs->root);
336 read_unlock(&fs->lock);
337 result = 0;
338 put_fs_struct(fs);
339 }
340 return result;
341}
342
Sripathi Kodi66dcca02005-09-19 18:26:12 -0500343
344/* Same as proc_root_link, but this addionally tries to get fs from other
345 * threads in the group */
346static int proc_task_root_link(struct inode *inode, struct dentry **dentry, struct vfsmount **mnt)
347{
348 struct fs_struct *fs;
349 int result = -ENOENT;
350 struct task_struct *leader = proc_task(inode);
351
352 task_lock(leader);
353 fs = leader->fs;
354 if (fs) {
355 atomic_inc(&fs->count);
356 task_unlock(leader);
357 } else {
358 /* Try to get fs from other threads */
359 task_unlock(leader);
360 struct task_struct *task = leader;
361 read_lock(&tasklist_lock);
362 if (pid_alive(task)) {
363 while ((task = next_thread(task)) != leader) {
364 task_lock(task);
365 fs = task->fs;
366 if (fs) {
367 atomic_inc(&fs->count);
368 task_unlock(task);
369 break;
370 }
371 task_unlock(task);
372 }
373 }
374 read_unlock(&tasklist_lock);
375 }
376
377 if (fs) {
378 read_lock(&fs->lock);
379 *mnt = mntget(fs->rootmnt);
380 *dentry = dget(fs->root);
381 read_unlock(&fs->lock);
382 result = 0;
383 put_fs_struct(fs);
384 }
385 return result;
386}
387
388
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389#define MAY_PTRACE(task) \
390 (task == current || \
391 (task->parent == current && \
392 (task->ptrace & PT_PTRACED) && \
393 (task->state == TASK_STOPPED || task->state == TASK_TRACED) && \
394 security_ptrace(current,task) == 0))
395
Linus Torvalds1da177e2005-04-16 15:20:36 -0700396static int proc_pid_environ(struct task_struct *task, char * buffer)
397{
398 int res = 0;
399 struct mm_struct *mm = get_task_mm(task);
400 if (mm) {
401 unsigned int len = mm->env_end - mm->env_start;
402 if (len > PAGE_SIZE)
403 len = PAGE_SIZE;
404 res = access_process_vm(task, mm->env_start, buffer, len, 0);
Miklos Szerediab8d11b2005-09-06 15:18:24 -0700405 if (!ptrace_may_attach(task))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406 res = -ESRCH;
407 mmput(mm);
408 }
409 return res;
410}
411
412static int proc_pid_cmdline(struct task_struct *task, char * buffer)
413{
414 int res = 0;
415 unsigned int len;
416 struct mm_struct *mm = get_task_mm(task);
417 if (!mm)
418 goto out;
419 if (!mm->arg_end)
420 goto out_mm; /* Shh! No looking before we're done */
421
422 len = mm->arg_end - mm->arg_start;
423
424 if (len > PAGE_SIZE)
425 len = PAGE_SIZE;
426
427 res = access_process_vm(task, mm->arg_start, buffer, len, 0);
428
429 // If the nul at the end of args has been overwritten, then
430 // assume application is using setproctitle(3).
431 if (res > 0 && buffer[res-1] != '\0' && len < PAGE_SIZE) {
432 len = strnlen(buffer, res);
433 if (len < res) {
434 res = len;
435 } else {
436 len = mm->env_end - mm->env_start;
437 if (len > PAGE_SIZE - res)
438 len = PAGE_SIZE - res;
439 res += access_process_vm(task, mm->env_start, buffer+res, len, 0);
440 res = strnlen(buffer, res);
441 }
442 }
443out_mm:
444 mmput(mm);
445out:
446 return res;
447}
448
449static int proc_pid_auxv(struct task_struct *task, char *buffer)
450{
451 int res = 0;
452 struct mm_struct *mm = get_task_mm(task);
453 if (mm) {
454 unsigned int nwords = 0;
455 do
456 nwords += 2;
457 while (mm->saved_auxv[nwords - 2] != 0); /* AT_NULL */
458 res = nwords * sizeof(mm->saved_auxv[0]);
459 if (res > PAGE_SIZE)
460 res = PAGE_SIZE;
461 memcpy(buffer, mm->saved_auxv, res);
462 mmput(mm);
463 }
464 return res;
465}
466
467
468#ifdef CONFIG_KALLSYMS
469/*
470 * Provides a wchan file via kallsyms in a proper one-value-per-file format.
471 * Returns the resolved symbol. If that fails, simply return the address.
472 */
473static int proc_pid_wchan(struct task_struct *task, char *buffer)
474{
475 char *modname;
476 const char *sym_name;
477 unsigned long wchan, size, offset;
478 char namebuf[KSYM_NAME_LEN+1];
479
480 wchan = get_wchan(task);
481
482 sym_name = kallsyms_lookup(wchan, &size, &offset, &modname, namebuf);
483 if (sym_name)
484 return sprintf(buffer, "%s", sym_name);
485 return sprintf(buffer, "%lu", wchan);
486}
487#endif /* CONFIG_KALLSYMS */
488
489#ifdef CONFIG_SCHEDSTATS
490/*
491 * Provides /proc/PID/schedstat
492 */
493static int proc_pid_schedstat(struct task_struct *task, char *buffer)
494{
495 return sprintf(buffer, "%lu %lu %lu\n",
496 task->sched_info.cpu_time,
497 task->sched_info.run_delay,
498 task->sched_info.pcnt);
499}
500#endif
501
502/* The badness from the OOM killer */
503unsigned long badness(struct task_struct *p, unsigned long uptime);
504static int proc_oom_score(struct task_struct *task, char *buffer)
505{
506 unsigned long points;
507 struct timespec uptime;
508
509 do_posix_clock_monotonic_gettime(&uptime);
510 points = badness(task, uptime.tv_sec);
511 return sprintf(buffer, "%lu\n", points);
512}
513
514/************************************************************************/
515/* Here the fs part begins */
516/************************************************************************/
517
518/* permission checks */
519
Sripathi Kodi66dcca02005-09-19 18:26:12 -0500520/* If the process being read is separated by chroot from the reading process,
521 * don't let the reader access the threads.
522 */
523static int proc_check_chroot(struct dentry *root, struct vfsmount *vfsmnt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700524{
Sripathi Kodi66dcca02005-09-19 18:26:12 -0500525 struct dentry *de, *base;
526 struct vfsmount *our_vfsmnt, *mnt;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700527 int res = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528 read_lock(&current->fs->lock);
529 our_vfsmnt = mntget(current->fs->rootmnt);
530 base = dget(current->fs->root);
531 read_unlock(&current->fs->lock);
532
533 spin_lock(&vfsmount_lock);
534 de = root;
535 mnt = vfsmnt;
536
537 while (vfsmnt != our_vfsmnt) {
538 if (vfsmnt == vfsmnt->mnt_parent)
539 goto out;
540 de = vfsmnt->mnt_mountpoint;
541 vfsmnt = vfsmnt->mnt_parent;
542 }
543
544 if (!is_subdir(de, base))
545 goto out;
546 spin_unlock(&vfsmount_lock);
547
548exit:
549 dput(base);
550 mntput(our_vfsmnt);
551 dput(root);
552 mntput(mnt);
553 return res;
554out:
555 spin_unlock(&vfsmount_lock);
556 res = -EACCES;
557 goto exit;
558}
559
Sripathi Kodi66dcca02005-09-19 18:26:12 -0500560static int proc_check_root(struct inode *inode)
561{
562 struct dentry *root;
563 struct vfsmount *vfsmnt;
564
565 if (proc_root_link(inode, &root, &vfsmnt)) /* Ewww... */
566 return -ENOENT;
567 return proc_check_chroot(root, vfsmnt);
568}
569
Linus Torvalds1da177e2005-04-16 15:20:36 -0700570static int proc_permission(struct inode *inode, int mask, struct nameidata *nd)
571{
572 if (generic_permission(inode, mask, NULL) != 0)
573 return -EACCES;
574 return proc_check_root(inode);
575}
576
Sripathi Kodi66dcca02005-09-19 18:26:12 -0500577static int proc_task_permission(struct inode *inode, int mask, struct nameidata *nd)
578{
579 struct dentry *root;
580 struct vfsmount *vfsmnt;
581
582 if (generic_permission(inode, mask, NULL) != 0)
583 return -EACCES;
584
585 if (proc_task_root_link(inode, &root, &vfsmnt))
586 return -ENOENT;
587
588 return proc_check_chroot(root, vfsmnt);
589}
590
Linus Torvalds1da177e2005-04-16 15:20:36 -0700591extern struct seq_operations proc_pid_maps_op;
592static int maps_open(struct inode *inode, struct file *file)
593{
594 struct task_struct *task = proc_task(inode);
595 int ret = seq_open(file, &proc_pid_maps_op);
596 if (!ret) {
597 struct seq_file *m = file->private_data;
598 m->private = task;
599 }
600 return ret;
601}
602
603static struct file_operations proc_maps_operations = {
604 .open = maps_open,
605 .read = seq_read,
606 .llseek = seq_lseek,
607 .release = seq_release,
608};
609
Christoph Lameter6e21c8f2005-09-03 15:54:45 -0700610#ifdef CONFIG_NUMA
611extern struct seq_operations proc_pid_numa_maps_op;
612static int numa_maps_open(struct inode *inode, struct file *file)
613{
614 struct task_struct *task = proc_task(inode);
615 int ret = seq_open(file, &proc_pid_numa_maps_op);
616 if (!ret) {
617 struct seq_file *m = file->private_data;
618 m->private = task;
619 }
620 return ret;
621}
622
623static struct file_operations proc_numa_maps_operations = {
624 .open = numa_maps_open,
625 .read = seq_read,
626 .llseek = seq_lseek,
627 .release = seq_release,
628};
629#endif
630
Mauricio Line070ad42005-09-03 15:55:10 -0700631extern struct seq_operations proc_pid_smaps_op;
632static int smaps_open(struct inode *inode, struct file *file)
633{
634 struct task_struct *task = proc_task(inode);
635 int ret = seq_open(file, &proc_pid_smaps_op);
636 if (!ret) {
637 struct seq_file *m = file->private_data;
638 m->private = task;
639 }
640 return ret;
641}
642
643static struct file_operations proc_smaps_operations = {
644 .open = smaps_open,
645 .read = seq_read,
646 .llseek = seq_lseek,
647 .release = seq_release,
648};
649
Linus Torvalds1da177e2005-04-16 15:20:36 -0700650extern struct seq_operations mounts_op;
651static int mounts_open(struct inode *inode, struct file *file)
652{
653 struct task_struct *task = proc_task(inode);
654 int ret = seq_open(file, &mounts_op);
655
656 if (!ret) {
657 struct seq_file *m = file->private_data;
658 struct namespace *namespace;
659 task_lock(task);
660 namespace = task->namespace;
661 if (namespace)
662 get_namespace(namespace);
663 task_unlock(task);
664
665 if (namespace)
666 m->private = namespace;
667 else {
668 seq_release(inode, file);
669 ret = -EINVAL;
670 }
671 }
672 return ret;
673}
674
675static int mounts_release(struct inode *inode, struct file *file)
676{
677 struct seq_file *m = file->private_data;
678 struct namespace *namespace = m->private;
679 put_namespace(namespace);
680 return seq_release(inode, file);
681}
682
683static struct file_operations proc_mounts_operations = {
684 .open = mounts_open,
685 .read = seq_read,
686 .llseek = seq_lseek,
687 .release = mounts_release,
688};
689
690#define PROC_BLOCK_SIZE (3*1024) /* 4K page size but our output routines use some slack for overruns */
691
692static ssize_t proc_info_read(struct file * file, char __user * buf,
693 size_t count, loff_t *ppos)
694{
695 struct inode * inode = file->f_dentry->d_inode;
696 unsigned long page;
697 ssize_t length;
698 struct task_struct *task = proc_task(inode);
699
700 if (count > PROC_BLOCK_SIZE)
701 count = PROC_BLOCK_SIZE;
702 if (!(page = __get_free_page(GFP_KERNEL)))
703 return -ENOMEM;
704
705 length = PROC_I(inode)->op.proc_read(task, (char*)page);
706
707 if (length >= 0)
708 length = simple_read_from_buffer(buf, count, ppos, (char *)page, length);
709 free_page(page);
710 return length;
711}
712
713static struct file_operations proc_info_file_operations = {
714 .read = proc_info_read,
715};
716
717static int mem_open(struct inode* inode, struct file* file)
718{
719 file->private_data = (void*)((long)current->self_exec_id);
720 return 0;
721}
722
723static ssize_t mem_read(struct file * file, char __user * buf,
724 size_t count, loff_t *ppos)
725{
726 struct task_struct *task = proc_task(file->f_dentry->d_inode);
727 char *page;
728 unsigned long src = *ppos;
729 int ret = -ESRCH;
730 struct mm_struct *mm;
731
Miklos Szerediab8d11b2005-09-06 15:18:24 -0700732 if (!MAY_PTRACE(task) || !ptrace_may_attach(task))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700733 goto out;
734
735 ret = -ENOMEM;
736 page = (char *)__get_free_page(GFP_USER);
737 if (!page)
738 goto out;
739
740 ret = 0;
741
742 mm = get_task_mm(task);
743 if (!mm)
744 goto out_free;
745
746 ret = -EIO;
747
748 if (file->private_data != (void*)((long)current->self_exec_id))
749 goto out_put;
750
751 ret = 0;
752
753 while (count > 0) {
754 int this_len, retval;
755
756 this_len = (count > PAGE_SIZE) ? PAGE_SIZE : count;
757 retval = access_process_vm(task, src, page, this_len, 0);
Miklos Szerediab8d11b2005-09-06 15:18:24 -0700758 if (!retval || !MAY_PTRACE(task) || !ptrace_may_attach(task)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700759 if (!ret)
760 ret = -EIO;
761 break;
762 }
763
764 if (copy_to_user(buf, page, retval)) {
765 ret = -EFAULT;
766 break;
767 }
768
769 ret += retval;
770 src += retval;
771 buf += retval;
772 count -= retval;
773 }
774 *ppos = src;
775
776out_put:
777 mmput(mm);
778out_free:
779 free_page((unsigned long) page);
780out:
781 return ret;
782}
783
784#define mem_write NULL
785
786#ifndef mem_write
787/* This is a security hazard */
788static ssize_t mem_write(struct file * file, const char * buf,
789 size_t count, loff_t *ppos)
790{
791 int copied = 0;
792 char *page;
793 struct task_struct *task = proc_task(file->f_dentry->d_inode);
794 unsigned long dst = *ppos;
795
Miklos Szerediab8d11b2005-09-06 15:18:24 -0700796 if (!MAY_PTRACE(task) || !ptrace_may_attach(task))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700797 return -ESRCH;
798
799 page = (char *)__get_free_page(GFP_USER);
800 if (!page)
801 return -ENOMEM;
802
803 while (count > 0) {
804 int this_len, retval;
805
806 this_len = (count > PAGE_SIZE) ? PAGE_SIZE : count;
807 if (copy_from_user(page, buf, this_len)) {
808 copied = -EFAULT;
809 break;
810 }
811 retval = access_process_vm(task, dst, page, this_len, 1);
812 if (!retval) {
813 if (!copied)
814 copied = -EIO;
815 break;
816 }
817 copied += retval;
818 buf += retval;
819 dst += retval;
820 count -= retval;
821 }
822 *ppos = dst;
823 free_page((unsigned long) page);
824 return copied;
825}
826#endif
827
828static loff_t mem_lseek(struct file * file, loff_t offset, int orig)
829{
830 switch (orig) {
831 case 0:
832 file->f_pos = offset;
833 break;
834 case 1:
835 file->f_pos += offset;
836 break;
837 default:
838 return -EINVAL;
839 }
840 force_successful_syscall_return();
841 return file->f_pos;
842}
843
844static struct file_operations proc_mem_operations = {
845 .llseek = mem_lseek,
846 .read = mem_read,
847 .write = mem_write,
848 .open = mem_open,
849};
850
851static ssize_t oom_adjust_read(struct file *file, char __user *buf,
852 size_t count, loff_t *ppos)
853{
854 struct task_struct *task = proc_task(file->f_dentry->d_inode);
855 char buffer[8];
856 size_t len;
857 int oom_adjust = task->oomkilladj;
858 loff_t __ppos = *ppos;
859
860 len = sprintf(buffer, "%i\n", oom_adjust);
861 if (__ppos >= len)
862 return 0;
863 if (count > len-__ppos)
864 count = len-__ppos;
865 if (copy_to_user(buf, buffer + __ppos, count))
866 return -EFAULT;
867 *ppos = __ppos + count;
868 return count;
869}
870
871static ssize_t oom_adjust_write(struct file *file, const char __user *buf,
872 size_t count, loff_t *ppos)
873{
874 struct task_struct *task = proc_task(file->f_dentry->d_inode);
875 char buffer[8], *end;
876 int oom_adjust;
877
878 if (!capable(CAP_SYS_RESOURCE))
879 return -EPERM;
880 memset(buffer, 0, 8);
881 if (count > 6)
882 count = 6;
883 if (copy_from_user(buffer, buf, count))
884 return -EFAULT;
885 oom_adjust = simple_strtol(buffer, &end, 0);
Andrea Arcangeli79befd02005-04-16 15:24:05 -0700886 if ((oom_adjust < -16 || oom_adjust > 15) && oom_adjust != OOM_DISABLE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700887 return -EINVAL;
888 if (*end == '\n')
889 end++;
890 task->oomkilladj = oom_adjust;
891 if (end - buffer == 0)
892 return -EIO;
893 return end - buffer;
894}
895
896static struct file_operations proc_oom_adjust_operations = {
897 .read = oom_adjust_read,
898 .write = oom_adjust_write,
899};
900
901static struct inode_operations proc_mem_inode_operations = {
902 .permission = proc_permission,
903};
904
905#ifdef CONFIG_AUDITSYSCALL
906#define TMPBUFLEN 21
907static ssize_t proc_loginuid_read(struct file * file, char __user * buf,
908 size_t count, loff_t *ppos)
909{
910 struct inode * inode = file->f_dentry->d_inode;
911 struct task_struct *task = proc_task(inode);
912 ssize_t length;
913 char tmpbuf[TMPBUFLEN];
914
915 length = scnprintf(tmpbuf, TMPBUFLEN, "%u",
916 audit_get_loginuid(task->audit_context));
917 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
918}
919
920static ssize_t proc_loginuid_write(struct file * file, const char __user * buf,
921 size_t count, loff_t *ppos)
922{
923 struct inode * inode = file->f_dentry->d_inode;
924 char *page, *tmp;
925 ssize_t length;
926 struct task_struct *task = proc_task(inode);
927 uid_t loginuid;
928
929 if (!capable(CAP_AUDIT_CONTROL))
930 return -EPERM;
931
932 if (current != task)
933 return -EPERM;
934
935 if (count > PAGE_SIZE)
936 count = PAGE_SIZE;
937
938 if (*ppos != 0) {
939 /* No partial writes. */
940 return -EINVAL;
941 }
942 page = (char*)__get_free_page(GFP_USER);
943 if (!page)
944 return -ENOMEM;
945 length = -EFAULT;
946 if (copy_from_user(page, buf, count))
947 goto out_free_page;
948
949 loginuid = simple_strtoul(page, &tmp, 10);
950 if (tmp == page) {
951 length = -EINVAL;
952 goto out_free_page;
953
954 }
Steve Grubb456be6c2005-04-29 17:30:07 +0100955 length = audit_set_loginuid(task, loginuid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700956 if (likely(length == 0))
957 length = count;
958
959out_free_page:
960 free_page((unsigned long) page);
961 return length;
962}
963
964static struct file_operations proc_loginuid_operations = {
965 .read = proc_loginuid_read,
966 .write = proc_loginuid_write,
967};
968#endif
969
970#ifdef CONFIG_SECCOMP
971static ssize_t seccomp_read(struct file *file, char __user *buf,
972 size_t count, loff_t *ppos)
973{
974 struct task_struct *tsk = proc_task(file->f_dentry->d_inode);
975 char __buf[20];
976 loff_t __ppos = *ppos;
977 size_t len;
978
979 /* no need to print the trailing zero, so use only len */
980 len = sprintf(__buf, "%u\n", tsk->seccomp.mode);
981 if (__ppos >= len)
982 return 0;
983 if (count > len - __ppos)
984 count = len - __ppos;
985 if (copy_to_user(buf, __buf + __ppos, count))
986 return -EFAULT;
987 *ppos = __ppos + count;
988 return count;
989}
990
991static ssize_t seccomp_write(struct file *file, const char __user *buf,
992 size_t count, loff_t *ppos)
993{
994 struct task_struct *tsk = proc_task(file->f_dentry->d_inode);
995 char __buf[20], *end;
996 unsigned int seccomp_mode;
997
998 /* can set it only once to be even more secure */
999 if (unlikely(tsk->seccomp.mode))
1000 return -EPERM;
1001
1002 memset(__buf, 0, sizeof(__buf));
1003 count = min(count, sizeof(__buf) - 1);
1004 if (copy_from_user(__buf, buf, count))
1005 return -EFAULT;
1006 seccomp_mode = simple_strtoul(__buf, &end, 0);
1007 if (*end == '\n')
1008 end++;
1009 if (seccomp_mode && seccomp_mode <= NR_SECCOMP_MODES) {
1010 tsk->seccomp.mode = seccomp_mode;
1011 set_tsk_thread_flag(tsk, TIF_SECCOMP);
1012 } else
1013 return -EINVAL;
1014 if (unlikely(!(end - __buf)))
1015 return -EIO;
1016 return end - __buf;
1017}
1018
1019static struct file_operations proc_seccomp_operations = {
1020 .read = seccomp_read,
1021 .write = seccomp_write,
1022};
1023#endif /* CONFIG_SECCOMP */
1024
Al Viro008b1502005-08-20 00:17:39 +01001025static void *proc_pid_follow_link(struct dentry *dentry, struct nameidata *nd)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001026{
1027 struct inode *inode = dentry->d_inode;
1028 int error = -EACCES;
1029
1030 /* We don't need a base pointer in the /proc filesystem */
1031 path_release(nd);
1032
1033 if (current->fsuid != inode->i_uid && !capable(CAP_DAC_OVERRIDE))
1034 goto out;
1035 error = proc_check_root(inode);
1036 if (error)
1037 goto out;
1038
1039 error = PROC_I(inode)->op.proc_get_link(inode, &nd->dentry, &nd->mnt);
1040 nd->last_type = LAST_BIND;
1041out:
Al Viro008b1502005-08-20 00:17:39 +01001042 return ERR_PTR(error);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001043}
1044
1045static int do_proc_readlink(struct dentry *dentry, struct vfsmount *mnt,
1046 char __user *buffer, int buflen)
1047{
1048 struct inode * inode;
1049 char *tmp = (char*)__get_free_page(GFP_KERNEL), *path;
1050 int len;
1051
1052 if (!tmp)
1053 return -ENOMEM;
1054
1055 inode = dentry->d_inode;
1056 path = d_path(dentry, mnt, tmp, PAGE_SIZE);
1057 len = PTR_ERR(path);
1058 if (IS_ERR(path))
1059 goto out;
1060 len = tmp + PAGE_SIZE - 1 - path;
1061
1062 if (len > buflen)
1063 len = buflen;
1064 if (copy_to_user(buffer, path, len))
1065 len = -EFAULT;
1066 out:
1067 free_page((unsigned long)tmp);
1068 return len;
1069}
1070
1071static int proc_pid_readlink(struct dentry * dentry, char __user * buffer, int buflen)
1072{
1073 int error = -EACCES;
1074 struct inode *inode = dentry->d_inode;
1075 struct dentry *de;
1076 struct vfsmount *mnt = NULL;
1077
1078 lock_kernel();
1079
1080 if (current->fsuid != inode->i_uid && !capable(CAP_DAC_OVERRIDE))
1081 goto out;
1082 error = proc_check_root(inode);
1083 if (error)
1084 goto out;
1085
1086 error = PROC_I(inode)->op.proc_get_link(inode, &de, &mnt);
1087 if (error)
1088 goto out;
1089
1090 error = do_proc_readlink(de, mnt, buffer, buflen);
1091 dput(de);
1092 mntput(mnt);
1093out:
1094 unlock_kernel();
1095 return error;
1096}
1097
1098static struct inode_operations proc_pid_link_inode_operations = {
1099 .readlink = proc_pid_readlink,
1100 .follow_link = proc_pid_follow_link
1101};
1102
1103#define NUMBUF 10
1104
1105static int proc_readfd(struct file * filp, void * dirent, filldir_t filldir)
1106{
1107 struct inode *inode = filp->f_dentry->d_inode;
1108 struct task_struct *p = proc_task(inode);
1109 unsigned int fd, tid, ino;
1110 int retval;
1111 char buf[NUMBUF];
1112 struct files_struct * files;
Dipankar Sarmabadf1662005-09-09 13:04:10 -07001113 struct fdtable *fdt;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001114
1115 retval = -ENOENT;
1116 if (!pid_alive(p))
1117 goto out;
1118 retval = 0;
1119 tid = p->pid;
1120
1121 fd = filp->f_pos;
1122 switch (fd) {
1123 case 0:
1124 if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0)
1125 goto out;
1126 filp->f_pos++;
1127 case 1:
1128 ino = fake_ino(tid, PROC_TID_INO);
1129 if (filldir(dirent, "..", 2, 1, ino, DT_DIR) < 0)
1130 goto out;
1131 filp->f_pos++;
1132 default:
1133 files = get_files_struct(p);
1134 if (!files)
1135 goto out;
Dipankar Sarmab8359962005-09-09 13:04:14 -07001136 rcu_read_lock();
Dipankar Sarmabadf1662005-09-09 13:04:10 -07001137 fdt = files_fdtable(files);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001138 for (fd = filp->f_pos-2;
Dipankar Sarmabadf1662005-09-09 13:04:10 -07001139 fd < fdt->max_fds;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001140 fd++, filp->f_pos++) {
1141 unsigned int i,j;
1142
1143 if (!fcheck_files(files, fd))
1144 continue;
Dipankar Sarmab8359962005-09-09 13:04:14 -07001145 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001146
1147 j = NUMBUF;
1148 i = fd;
1149 do {
1150 j--;
1151 buf[j] = '0' + (i % 10);
1152 i /= 10;
1153 } while (i);
1154
1155 ino = fake_ino(tid, PROC_TID_FD_DIR + fd);
1156 if (filldir(dirent, buf+j, NUMBUF-j, fd+2, ino, DT_LNK) < 0) {
Dipankar Sarmab8359962005-09-09 13:04:14 -07001157 rcu_read_lock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001158 break;
1159 }
Dipankar Sarmab8359962005-09-09 13:04:14 -07001160 rcu_read_lock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001161 }
Dipankar Sarmab8359962005-09-09 13:04:14 -07001162 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001163 put_files_struct(files);
1164 }
1165out:
1166 return retval;
1167}
1168
1169static int proc_pident_readdir(struct file *filp,
1170 void *dirent, filldir_t filldir,
1171 struct pid_entry *ents, unsigned int nents)
1172{
1173 int i;
1174 int pid;
1175 struct dentry *dentry = filp->f_dentry;
1176 struct inode *inode = dentry->d_inode;
1177 struct pid_entry *p;
1178 ino_t ino;
1179 int ret;
1180
1181 ret = -ENOENT;
1182 if (!pid_alive(proc_task(inode)))
1183 goto out;
1184
1185 ret = 0;
1186 pid = proc_task(inode)->pid;
1187 i = filp->f_pos;
1188 switch (i) {
1189 case 0:
1190 ino = inode->i_ino;
1191 if (filldir(dirent, ".", 1, i, ino, DT_DIR) < 0)
1192 goto out;
1193 i++;
1194 filp->f_pos++;
1195 /* fall through */
1196 case 1:
1197 ino = parent_ino(dentry);
1198 if (filldir(dirent, "..", 2, i, ino, DT_DIR) < 0)
1199 goto out;
1200 i++;
1201 filp->f_pos++;
1202 /* fall through */
1203 default:
1204 i -= 2;
1205 if (i >= nents) {
1206 ret = 1;
1207 goto out;
1208 }
1209 p = ents + i;
1210 while (p->name) {
1211 if (filldir(dirent, p->name, p->len, filp->f_pos,
1212 fake_ino(pid, p->type), p->mode >> 12) < 0)
1213 goto out;
1214 filp->f_pos++;
1215 p++;
1216 }
1217 }
1218
1219 ret = 1;
1220out:
1221 return ret;
1222}
1223
1224static int proc_tgid_base_readdir(struct file * filp,
1225 void * dirent, filldir_t filldir)
1226{
1227 return proc_pident_readdir(filp,dirent,filldir,
1228 tgid_base_stuff,ARRAY_SIZE(tgid_base_stuff));
1229}
1230
1231static int proc_tid_base_readdir(struct file * filp,
1232 void * dirent, filldir_t filldir)
1233{
1234 return proc_pident_readdir(filp,dirent,filldir,
1235 tid_base_stuff,ARRAY_SIZE(tid_base_stuff));
1236}
1237
1238/* building an inode */
1239
1240static int task_dumpable(struct task_struct *task)
1241{
1242 int dumpable = 0;
1243 struct mm_struct *mm;
1244
1245 task_lock(task);
1246 mm = task->mm;
1247 if (mm)
1248 dumpable = mm->dumpable;
1249 task_unlock(task);
Alan Coxd6e71142005-06-23 00:09:43 -07001250 if(dumpable == 1)
1251 return 1;
1252 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001253}
1254
1255
1256static struct inode *proc_pid_make_inode(struct super_block * sb, struct task_struct *task, int ino)
1257{
1258 struct inode * inode;
1259 struct proc_inode *ei;
1260
1261 /* We need a new inode */
1262
1263 inode = new_inode(sb);
1264 if (!inode)
1265 goto out;
1266
1267 /* Common stuff */
1268 ei = PROC_I(inode);
1269 ei->task = NULL;
1270 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
1271 inode->i_ino = fake_ino(task->pid, ino);
1272
1273 if (!pid_alive(task))
1274 goto out_unlock;
1275
1276 /*
1277 * grab the reference to task.
1278 */
1279 get_task_struct(task);
1280 ei->task = task;
1281 ei->type = ino;
1282 inode->i_uid = 0;
1283 inode->i_gid = 0;
1284 if (ino == PROC_TGID_INO || ino == PROC_TID_INO || task_dumpable(task)) {
1285 inode->i_uid = task->euid;
1286 inode->i_gid = task->egid;
1287 }
1288 security_task_to_inode(task, inode);
1289
1290out:
1291 return inode;
1292
1293out_unlock:
1294 ei->pde = NULL;
1295 iput(inode);
1296 return NULL;
1297}
1298
1299/* dentry stuff */
1300
1301/*
1302 * Exceptional case: normally we are not allowed to unhash a busy
1303 * directory. In this case, however, we can do it - no aliasing problems
1304 * due to the way we treat inodes.
1305 *
1306 * Rewrite the inode's ownerships here because the owning task may have
1307 * performed a setuid(), etc.
1308 */
1309static int pid_revalidate(struct dentry *dentry, struct nameidata *nd)
1310{
1311 struct inode *inode = dentry->d_inode;
1312 struct task_struct *task = proc_task(inode);
1313 if (pid_alive(task)) {
1314 if (proc_type(inode) == PROC_TGID_INO || proc_type(inode) == PROC_TID_INO || task_dumpable(task)) {
1315 inode->i_uid = task->euid;
1316 inode->i_gid = task->egid;
1317 } else {
1318 inode->i_uid = 0;
1319 inode->i_gid = 0;
1320 }
1321 security_task_to_inode(task, inode);
1322 return 1;
1323 }
1324 d_drop(dentry);
1325 return 0;
1326}
1327
1328static int tid_fd_revalidate(struct dentry *dentry, struct nameidata *nd)
1329{
1330 struct inode *inode = dentry->d_inode;
1331 struct task_struct *task = proc_task(inode);
1332 int fd = proc_type(inode) - PROC_TID_FD_DIR;
1333 struct files_struct *files;
1334
1335 files = get_files_struct(task);
1336 if (files) {
Dipankar Sarmab8359962005-09-09 13:04:14 -07001337 rcu_read_lock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001338 if (fcheck_files(files, fd)) {
Dipankar Sarmab8359962005-09-09 13:04:14 -07001339 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001340 put_files_struct(files);
1341 if (task_dumpable(task)) {
1342 inode->i_uid = task->euid;
1343 inode->i_gid = task->egid;
1344 } else {
1345 inode->i_uid = 0;
1346 inode->i_gid = 0;
1347 }
1348 security_task_to_inode(task, inode);
1349 return 1;
1350 }
Dipankar Sarmab8359962005-09-09 13:04:14 -07001351 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001352 put_files_struct(files);
1353 }
1354 d_drop(dentry);
1355 return 0;
1356}
1357
1358static void pid_base_iput(struct dentry *dentry, struct inode *inode)
1359{
1360 struct task_struct *task = proc_task(inode);
1361 spin_lock(&task->proc_lock);
1362 if (task->proc_dentry == dentry)
1363 task->proc_dentry = NULL;
1364 spin_unlock(&task->proc_lock);
1365 iput(inode);
1366}
1367
1368static int pid_delete_dentry(struct dentry * dentry)
1369{
1370 /* Is the task we represent dead?
1371 * If so, then don't put the dentry on the lru list,
1372 * kill it immediately.
1373 */
1374 return !pid_alive(proc_task(dentry->d_inode));
1375}
1376
1377static struct dentry_operations tid_fd_dentry_operations =
1378{
1379 .d_revalidate = tid_fd_revalidate,
1380 .d_delete = pid_delete_dentry,
1381};
1382
1383static struct dentry_operations pid_dentry_operations =
1384{
1385 .d_revalidate = pid_revalidate,
1386 .d_delete = pid_delete_dentry,
1387};
1388
1389static struct dentry_operations pid_base_dentry_operations =
1390{
1391 .d_revalidate = pid_revalidate,
1392 .d_iput = pid_base_iput,
1393 .d_delete = pid_delete_dentry,
1394};
1395
1396/* Lookups */
1397
1398static unsigned name_to_int(struct dentry *dentry)
1399{
1400 const char *name = dentry->d_name.name;
1401 int len = dentry->d_name.len;
1402 unsigned n = 0;
1403
1404 if (len > 1 && *name == '0')
1405 goto out;
1406 while (len-- > 0) {
1407 unsigned c = *name++ - '0';
1408 if (c > 9)
1409 goto out;
1410 if (n >= (~0U-9)/10)
1411 goto out;
1412 n *= 10;
1413 n += c;
1414 }
1415 return n;
1416out:
1417 return ~0U;
1418}
1419
1420/* SMP-safe */
1421static struct dentry *proc_lookupfd(struct inode * dir, struct dentry * dentry, struct nameidata *nd)
1422{
1423 struct task_struct *task = proc_task(dir);
1424 unsigned fd = name_to_int(dentry);
1425 struct file * file;
1426 struct files_struct * files;
1427 struct inode *inode;
1428 struct proc_inode *ei;
1429
1430 if (fd == ~0U)
1431 goto out;
1432 if (!pid_alive(task))
1433 goto out;
1434
1435 inode = proc_pid_make_inode(dir->i_sb, task, PROC_TID_FD_DIR+fd);
1436 if (!inode)
1437 goto out;
1438 ei = PROC_I(inode);
1439 files = get_files_struct(task);
1440 if (!files)
1441 goto out_unlock;
1442 inode->i_mode = S_IFLNK;
Dipankar Sarmab8359962005-09-09 13:04:14 -07001443 rcu_read_lock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001444 file = fcheck_files(files, fd);
1445 if (!file)
1446 goto out_unlock2;
1447 if (file->f_mode & 1)
1448 inode->i_mode |= S_IRUSR | S_IXUSR;
1449 if (file->f_mode & 2)
1450 inode->i_mode |= S_IWUSR | S_IXUSR;
Dipankar Sarmab8359962005-09-09 13:04:14 -07001451 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001452 put_files_struct(files);
1453 inode->i_op = &proc_pid_link_inode_operations;
1454 inode->i_size = 64;
1455 ei->op.proc_get_link = proc_fd_link;
1456 dentry->d_op = &tid_fd_dentry_operations;
1457 d_add(dentry, inode);
1458 return NULL;
1459
1460out_unlock2:
Dipankar Sarmab8359962005-09-09 13:04:14 -07001461 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001462 put_files_struct(files);
1463out_unlock:
1464 iput(inode);
1465out:
1466 return ERR_PTR(-ENOENT);
1467}
1468
1469static int proc_task_readdir(struct file * filp, void * dirent, filldir_t filldir);
1470static struct dentry *proc_task_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd);
1471
1472static struct file_operations proc_fd_operations = {
1473 .read = generic_read_dir,
1474 .readdir = proc_readfd,
1475};
1476
1477static struct file_operations proc_task_operations = {
1478 .read = generic_read_dir,
1479 .readdir = proc_task_readdir,
1480};
1481
1482/*
1483 * proc directories can do almost nothing..
1484 */
1485static struct inode_operations proc_fd_inode_operations = {
1486 .lookup = proc_lookupfd,
1487 .permission = proc_permission,
1488};
1489
1490static struct inode_operations proc_task_inode_operations = {
1491 .lookup = proc_task_lookup,
Sripathi Kodi66dcca02005-09-19 18:26:12 -05001492 .permission = proc_task_permission,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001493};
1494
1495#ifdef CONFIG_SECURITY
1496static ssize_t proc_pid_attr_read(struct file * file, char __user * buf,
1497 size_t count, loff_t *ppos)
1498{
1499 struct inode * inode = file->f_dentry->d_inode;
1500 unsigned long page;
1501 ssize_t length;
1502 struct task_struct *task = proc_task(inode);
1503
1504 if (count > PAGE_SIZE)
1505 count = PAGE_SIZE;
1506 if (!(page = __get_free_page(GFP_KERNEL)))
1507 return -ENOMEM;
1508
1509 length = security_getprocattr(task,
1510 (char*)file->f_dentry->d_name.name,
1511 (void*)page, count);
1512 if (length >= 0)
1513 length = simple_read_from_buffer(buf, count, ppos, (char *)page, length);
1514 free_page(page);
1515 return length;
1516}
1517
1518static ssize_t proc_pid_attr_write(struct file * file, const char __user * buf,
1519 size_t count, loff_t *ppos)
1520{
1521 struct inode * inode = file->f_dentry->d_inode;
1522 char *page;
1523 ssize_t length;
1524 struct task_struct *task = proc_task(inode);
1525
1526 if (count > PAGE_SIZE)
1527 count = PAGE_SIZE;
1528 if (*ppos != 0) {
1529 /* No partial writes. */
1530 return -EINVAL;
1531 }
1532 page = (char*)__get_free_page(GFP_USER);
1533 if (!page)
1534 return -ENOMEM;
1535 length = -EFAULT;
1536 if (copy_from_user(page, buf, count))
1537 goto out;
1538
1539 length = security_setprocattr(task,
1540 (char*)file->f_dentry->d_name.name,
1541 (void*)page, count);
1542out:
1543 free_page((unsigned long) page);
1544 return length;
1545}
1546
1547static struct file_operations proc_pid_attr_operations = {
1548 .read = proc_pid_attr_read,
1549 .write = proc_pid_attr_write,
1550};
1551
1552static struct file_operations proc_tid_attr_operations;
1553static struct inode_operations proc_tid_attr_inode_operations;
1554static struct file_operations proc_tgid_attr_operations;
1555static struct inode_operations proc_tgid_attr_inode_operations;
1556#endif
1557
Daniel Drakef2463152005-05-01 08:59:03 -07001558static int get_tid_list(int index, unsigned int *tids, struct inode *dir);
1559
Linus Torvalds1da177e2005-04-16 15:20:36 -07001560/* SMP-safe */
1561static struct dentry *proc_pident_lookup(struct inode *dir,
1562 struct dentry *dentry,
1563 struct pid_entry *ents)
1564{
1565 struct inode *inode;
1566 int error;
1567 struct task_struct *task = proc_task(dir);
1568 struct pid_entry *p;
1569 struct proc_inode *ei;
1570
1571 error = -ENOENT;
1572 inode = NULL;
1573
1574 if (!pid_alive(task))
1575 goto out;
1576
1577 for (p = ents; p->name; p++) {
1578 if (p->len != dentry->d_name.len)
1579 continue;
1580 if (!memcmp(dentry->d_name.name, p->name, p->len))
1581 break;
1582 }
1583 if (!p->name)
1584 goto out;
1585
1586 error = -EINVAL;
1587 inode = proc_pid_make_inode(dir->i_sb, task, p->type);
1588 if (!inode)
1589 goto out;
1590
1591 ei = PROC_I(inode);
1592 inode->i_mode = p->mode;
1593 /*
1594 * Yes, it does not scale. And it should not. Don't add
1595 * new entries into /proc/<tgid>/ without very good reasons.
1596 */
1597 switch(p->type) {
1598 case PROC_TGID_TASK:
Daniel Drakef2463152005-05-01 08:59:03 -07001599 inode->i_nlink = 2 + get_tid_list(2, NULL, dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001600 inode->i_op = &proc_task_inode_operations;
1601 inode->i_fop = &proc_task_operations;
1602 break;
1603 case PROC_TID_FD:
1604 case PROC_TGID_FD:
1605 inode->i_nlink = 2;
1606 inode->i_op = &proc_fd_inode_operations;
1607 inode->i_fop = &proc_fd_operations;
1608 break;
1609 case PROC_TID_EXE:
1610 case PROC_TGID_EXE:
1611 inode->i_op = &proc_pid_link_inode_operations;
1612 ei->op.proc_get_link = proc_exe_link;
1613 break;
1614 case PROC_TID_CWD:
1615 case PROC_TGID_CWD:
1616 inode->i_op = &proc_pid_link_inode_operations;
1617 ei->op.proc_get_link = proc_cwd_link;
1618 break;
1619 case PROC_TID_ROOT:
1620 case PROC_TGID_ROOT:
1621 inode->i_op = &proc_pid_link_inode_operations;
1622 ei->op.proc_get_link = proc_root_link;
1623 break;
1624 case PROC_TID_ENVIRON:
1625 case PROC_TGID_ENVIRON:
1626 inode->i_fop = &proc_info_file_operations;
1627 ei->op.proc_read = proc_pid_environ;
1628 break;
1629 case PROC_TID_AUXV:
1630 case PROC_TGID_AUXV:
1631 inode->i_fop = &proc_info_file_operations;
1632 ei->op.proc_read = proc_pid_auxv;
1633 break;
1634 case PROC_TID_STATUS:
1635 case PROC_TGID_STATUS:
1636 inode->i_fop = &proc_info_file_operations;
1637 ei->op.proc_read = proc_pid_status;
1638 break;
1639 case PROC_TID_STAT:
1640 inode->i_fop = &proc_info_file_operations;
1641 ei->op.proc_read = proc_tid_stat;
1642 break;
1643 case PROC_TGID_STAT:
1644 inode->i_fop = &proc_info_file_operations;
1645 ei->op.proc_read = proc_tgid_stat;
1646 break;
1647 case PROC_TID_CMDLINE:
1648 case PROC_TGID_CMDLINE:
1649 inode->i_fop = &proc_info_file_operations;
1650 ei->op.proc_read = proc_pid_cmdline;
1651 break;
1652 case PROC_TID_STATM:
1653 case PROC_TGID_STATM:
1654 inode->i_fop = &proc_info_file_operations;
1655 ei->op.proc_read = proc_pid_statm;
1656 break;
1657 case PROC_TID_MAPS:
1658 case PROC_TGID_MAPS:
1659 inode->i_fop = &proc_maps_operations;
1660 break;
Christoph Lameter6e21c8f2005-09-03 15:54:45 -07001661#ifdef CONFIG_NUMA
1662 case PROC_TID_NUMA_MAPS:
1663 case PROC_TGID_NUMA_MAPS:
1664 inode->i_fop = &proc_numa_maps_operations;
1665 break;
1666#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001667 case PROC_TID_MEM:
1668 case PROC_TGID_MEM:
1669 inode->i_op = &proc_mem_inode_operations;
1670 inode->i_fop = &proc_mem_operations;
1671 break;
1672#ifdef CONFIG_SECCOMP
1673 case PROC_TID_SECCOMP:
1674 case PROC_TGID_SECCOMP:
1675 inode->i_fop = &proc_seccomp_operations;
1676 break;
1677#endif /* CONFIG_SECCOMP */
1678 case PROC_TID_MOUNTS:
1679 case PROC_TGID_MOUNTS:
1680 inode->i_fop = &proc_mounts_operations;
1681 break;
Mauricio Line070ad42005-09-03 15:55:10 -07001682 case PROC_TID_SMAPS:
1683 case PROC_TGID_SMAPS:
1684 inode->i_fop = &proc_smaps_operations;
1685 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001686#ifdef CONFIG_SECURITY
1687 case PROC_TID_ATTR:
1688 inode->i_nlink = 2;
1689 inode->i_op = &proc_tid_attr_inode_operations;
1690 inode->i_fop = &proc_tid_attr_operations;
1691 break;
1692 case PROC_TGID_ATTR:
1693 inode->i_nlink = 2;
1694 inode->i_op = &proc_tgid_attr_inode_operations;
1695 inode->i_fop = &proc_tgid_attr_operations;
1696 break;
1697 case PROC_TID_ATTR_CURRENT:
1698 case PROC_TGID_ATTR_CURRENT:
1699 case PROC_TID_ATTR_PREV:
1700 case PROC_TGID_ATTR_PREV:
1701 case PROC_TID_ATTR_EXEC:
1702 case PROC_TGID_ATTR_EXEC:
1703 case PROC_TID_ATTR_FSCREATE:
1704 case PROC_TGID_ATTR_FSCREATE:
1705 inode->i_fop = &proc_pid_attr_operations;
1706 break;
1707#endif
1708#ifdef CONFIG_KALLSYMS
1709 case PROC_TID_WCHAN:
1710 case PROC_TGID_WCHAN:
1711 inode->i_fop = &proc_info_file_operations;
1712 ei->op.proc_read = proc_pid_wchan;
1713 break;
1714#endif
1715#ifdef CONFIG_SCHEDSTATS
1716 case PROC_TID_SCHEDSTAT:
1717 case PROC_TGID_SCHEDSTAT:
1718 inode->i_fop = &proc_info_file_operations;
1719 ei->op.proc_read = proc_pid_schedstat;
1720 break;
1721#endif
1722#ifdef CONFIG_CPUSETS
1723 case PROC_TID_CPUSET:
1724 case PROC_TGID_CPUSET:
1725 inode->i_fop = &proc_cpuset_operations;
1726 break;
1727#endif
1728 case PROC_TID_OOM_SCORE:
1729 case PROC_TGID_OOM_SCORE:
1730 inode->i_fop = &proc_info_file_operations;
1731 ei->op.proc_read = proc_oom_score;
1732 break;
1733 case PROC_TID_OOM_ADJUST:
1734 case PROC_TGID_OOM_ADJUST:
1735 inode->i_fop = &proc_oom_adjust_operations;
1736 break;
1737#ifdef CONFIG_AUDITSYSCALL
1738 case PROC_TID_LOGINUID:
1739 case PROC_TGID_LOGINUID:
1740 inode->i_fop = &proc_loginuid_operations;
1741 break;
1742#endif
1743 default:
1744 printk("procfs: impossible type (%d)",p->type);
1745 iput(inode);
1746 return ERR_PTR(-EINVAL);
1747 }
1748 dentry->d_op = &pid_dentry_operations;
1749 d_add(dentry, inode);
1750 return NULL;
1751
1752out:
1753 return ERR_PTR(error);
1754}
1755
1756static struct dentry *proc_tgid_base_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd){
1757 return proc_pident_lookup(dir, dentry, tgid_base_stuff);
1758}
1759
1760static struct dentry *proc_tid_base_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd){
1761 return proc_pident_lookup(dir, dentry, tid_base_stuff);
1762}
1763
1764static struct file_operations proc_tgid_base_operations = {
1765 .read = generic_read_dir,
1766 .readdir = proc_tgid_base_readdir,
1767};
1768
1769static struct file_operations proc_tid_base_operations = {
1770 .read = generic_read_dir,
1771 .readdir = proc_tid_base_readdir,
1772};
1773
1774static struct inode_operations proc_tgid_base_inode_operations = {
1775 .lookup = proc_tgid_base_lookup,
1776};
1777
1778static struct inode_operations proc_tid_base_inode_operations = {
1779 .lookup = proc_tid_base_lookup,
1780};
1781
1782#ifdef CONFIG_SECURITY
1783static int proc_tgid_attr_readdir(struct file * filp,
1784 void * dirent, filldir_t filldir)
1785{
1786 return proc_pident_readdir(filp,dirent,filldir,
1787 tgid_attr_stuff,ARRAY_SIZE(tgid_attr_stuff));
1788}
1789
1790static int proc_tid_attr_readdir(struct file * filp,
1791 void * dirent, filldir_t filldir)
1792{
1793 return proc_pident_readdir(filp,dirent,filldir,
1794 tid_attr_stuff,ARRAY_SIZE(tid_attr_stuff));
1795}
1796
1797static struct file_operations proc_tgid_attr_operations = {
1798 .read = generic_read_dir,
1799 .readdir = proc_tgid_attr_readdir,
1800};
1801
1802static struct file_operations proc_tid_attr_operations = {
1803 .read = generic_read_dir,
1804 .readdir = proc_tid_attr_readdir,
1805};
1806
1807static struct dentry *proc_tgid_attr_lookup(struct inode *dir,
1808 struct dentry *dentry, struct nameidata *nd)
1809{
1810 return proc_pident_lookup(dir, dentry, tgid_attr_stuff);
1811}
1812
1813static struct dentry *proc_tid_attr_lookup(struct inode *dir,
1814 struct dentry *dentry, struct nameidata *nd)
1815{
1816 return proc_pident_lookup(dir, dentry, tid_attr_stuff);
1817}
1818
1819static struct inode_operations proc_tgid_attr_inode_operations = {
1820 .lookup = proc_tgid_attr_lookup,
1821};
1822
1823static struct inode_operations proc_tid_attr_inode_operations = {
1824 .lookup = proc_tid_attr_lookup,
1825};
1826#endif
1827
1828/*
1829 * /proc/self:
1830 */
1831static int proc_self_readlink(struct dentry *dentry, char __user *buffer,
1832 int buflen)
1833{
1834 char tmp[30];
1835 sprintf(tmp, "%d", current->tgid);
1836 return vfs_readlink(dentry,buffer,buflen,tmp);
1837}
1838
Al Viro008b1502005-08-20 00:17:39 +01001839static void *proc_self_follow_link(struct dentry *dentry, struct nameidata *nd)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001840{
1841 char tmp[30];
1842 sprintf(tmp, "%d", current->tgid);
Al Viro008b1502005-08-20 00:17:39 +01001843 return ERR_PTR(vfs_follow_link(nd,tmp));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001844}
1845
1846static struct inode_operations proc_self_inode_operations = {
1847 .readlink = proc_self_readlink,
1848 .follow_link = proc_self_follow_link,
1849};
1850
1851/**
Pavel Pisa4dc3b162005-05-01 08:59:25 -07001852 * proc_pid_unhash - Unhash /proc/@pid entry from the dcache.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001853 * @p: task that should be flushed.
1854 *
Pavel Pisa4dc3b162005-05-01 08:59:25 -07001855 * Drops the /proc/@pid dcache entry from the hash chains.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001856 *
Pavel Pisa4dc3b162005-05-01 08:59:25 -07001857 * Dropping /proc/@pid entries and detach_pid must be synchroneous,
1858 * otherwise e.g. /proc/@pid/exe might point to the wrong executable,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001859 * if the pid value is immediately reused. This is enforced by
1860 * - caller must acquire spin_lock(p->proc_lock)
1861 * - must be called before detach_pid()
1862 * - proc_pid_lookup acquires proc_lock, and checks that
1863 * the target is not dead by looking at the attach count
1864 * of PIDTYPE_PID.
1865 */
1866
1867struct dentry *proc_pid_unhash(struct task_struct *p)
1868{
1869 struct dentry *proc_dentry;
1870
1871 proc_dentry = p->proc_dentry;
1872 if (proc_dentry != NULL) {
1873
1874 spin_lock(&dcache_lock);
1875 spin_lock(&proc_dentry->d_lock);
1876 if (!d_unhashed(proc_dentry)) {
1877 dget_locked(proc_dentry);
1878 __d_drop(proc_dentry);
1879 spin_unlock(&proc_dentry->d_lock);
1880 } else {
1881 spin_unlock(&proc_dentry->d_lock);
1882 proc_dentry = NULL;
1883 }
1884 spin_unlock(&dcache_lock);
1885 }
1886 return proc_dentry;
1887}
1888
1889/**
Pavel Pisa4dc3b162005-05-01 08:59:25 -07001890 * proc_pid_flush - recover memory used by stale /proc/@pid/x entries
Martin Waitz67be2dd2005-05-01 08:59:26 -07001891 * @proc_dentry: directoy to prune.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001892 *
1893 * Shrink the /proc directory that was used by the just killed thread.
1894 */
1895
1896void proc_pid_flush(struct dentry *proc_dentry)
1897{
1898 might_sleep();
1899 if(proc_dentry != NULL) {
1900 shrink_dcache_parent(proc_dentry);
1901 dput(proc_dentry);
1902 }
1903}
1904
1905/* SMP-safe */
1906struct dentry *proc_pid_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd)
1907{
1908 struct task_struct *task;
1909 struct inode *inode;
1910 struct proc_inode *ei;
1911 unsigned tgid;
1912 int died;
1913
1914 if (dentry->d_name.len == 4 && !memcmp(dentry->d_name.name,"self",4)) {
1915 inode = new_inode(dir->i_sb);
1916 if (!inode)
1917 return ERR_PTR(-ENOMEM);
1918 ei = PROC_I(inode);
1919 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
1920 inode->i_ino = fake_ino(0, PROC_TGID_INO);
1921 ei->pde = NULL;
1922 inode->i_mode = S_IFLNK|S_IRWXUGO;
1923 inode->i_uid = inode->i_gid = 0;
1924 inode->i_size = 64;
1925 inode->i_op = &proc_self_inode_operations;
1926 d_add(dentry, inode);
1927 return NULL;
1928 }
1929 tgid = name_to_int(dentry);
1930 if (tgid == ~0U)
1931 goto out;
1932
1933 read_lock(&tasklist_lock);
1934 task = find_task_by_pid(tgid);
1935 if (task)
1936 get_task_struct(task);
1937 read_unlock(&tasklist_lock);
1938 if (!task)
1939 goto out;
1940
1941 inode = proc_pid_make_inode(dir->i_sb, task, PROC_TGID_INO);
1942
1943
1944 if (!inode) {
1945 put_task_struct(task);
1946 goto out;
1947 }
1948 inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO;
1949 inode->i_op = &proc_tgid_base_inode_operations;
1950 inode->i_fop = &proc_tgid_base_operations;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001951 inode->i_flags|=S_IMMUTABLE;
Daniel Drakebcf88e12005-05-01 08:59:03 -07001952#ifdef CONFIG_SECURITY
1953 inode->i_nlink = 5;
1954#else
1955 inode->i_nlink = 4;
1956#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001957
1958 dentry->d_op = &pid_base_dentry_operations;
1959
1960 died = 0;
1961 d_add(dentry, inode);
1962 spin_lock(&task->proc_lock);
1963 task->proc_dentry = dentry;
1964 if (!pid_alive(task)) {
1965 dentry = proc_pid_unhash(task);
1966 died = 1;
1967 }
1968 spin_unlock(&task->proc_lock);
1969
1970 put_task_struct(task);
1971 if (died) {
1972 proc_pid_flush(dentry);
1973 goto out;
1974 }
1975 return NULL;
1976out:
1977 return ERR_PTR(-ENOENT);
1978}
1979
1980/* SMP-safe */
1981static struct dentry *proc_task_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd)
1982{
1983 struct task_struct *task;
1984 struct task_struct *leader = proc_task(dir);
1985 struct inode *inode;
1986 unsigned tid;
1987
1988 tid = name_to_int(dentry);
1989 if (tid == ~0U)
1990 goto out;
1991
1992 read_lock(&tasklist_lock);
1993 task = find_task_by_pid(tid);
1994 if (task)
1995 get_task_struct(task);
1996 read_unlock(&tasklist_lock);
1997 if (!task)
1998 goto out;
1999 if (leader->tgid != task->tgid)
2000 goto out_drop_task;
2001
2002 inode = proc_pid_make_inode(dir->i_sb, task, PROC_TID_INO);
2003
2004
2005 if (!inode)
2006 goto out_drop_task;
2007 inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO;
2008 inode->i_op = &proc_tid_base_inode_operations;
2009 inode->i_fop = &proc_tid_base_operations;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002010 inode->i_flags|=S_IMMUTABLE;
Daniel Drakebcf88e12005-05-01 08:59:03 -07002011#ifdef CONFIG_SECURITY
2012 inode->i_nlink = 4;
2013#else
2014 inode->i_nlink = 3;
2015#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07002016
2017 dentry->d_op = &pid_base_dentry_operations;
2018
2019 d_add(dentry, inode);
2020
2021 put_task_struct(task);
2022 return NULL;
2023out_drop_task:
2024 put_task_struct(task);
2025out:
2026 return ERR_PTR(-ENOENT);
2027}
2028
2029#define PROC_NUMBUF 10
2030#define PROC_MAXPIDS 20
2031
2032/*
2033 * Get a few tgid's to return for filldir - we need to hold the
2034 * tasklist lock while doing this, and we must release it before
2035 * we actually do the filldir itself, so we use a temp buffer..
2036 */
2037static int get_tgid_list(int index, unsigned long version, unsigned int *tgids)
2038{
2039 struct task_struct *p;
2040 int nr_tgids = 0;
2041
2042 index--;
2043 read_lock(&tasklist_lock);
2044 p = NULL;
2045 if (version) {
2046 p = find_task_by_pid(version);
2047 if (p && !thread_group_leader(p))
2048 p = NULL;
2049 }
2050
2051 if (p)
2052 index = 0;
2053 else
2054 p = next_task(&init_task);
2055
2056 for ( ; p != &init_task; p = next_task(p)) {
2057 int tgid = p->pid;
2058 if (!pid_alive(p))
2059 continue;
2060 if (--index >= 0)
2061 continue;
2062 tgids[nr_tgids] = tgid;
2063 nr_tgids++;
2064 if (nr_tgids >= PROC_MAXPIDS)
2065 break;
2066 }
2067 read_unlock(&tasklist_lock);
2068 return nr_tgids;
2069}
2070
2071/*
2072 * Get a few tid's to return for filldir - we need to hold the
2073 * tasklist lock while doing this, and we must release it before
2074 * we actually do the filldir itself, so we use a temp buffer..
2075 */
2076static int get_tid_list(int index, unsigned int *tids, struct inode *dir)
2077{
2078 struct task_struct *leader_task = proc_task(dir);
2079 struct task_struct *task = leader_task;
2080 int nr_tids = 0;
2081
2082 index -= 2;
2083 read_lock(&tasklist_lock);
2084 /*
2085 * The starting point task (leader_task) might be an already
2086 * unlinked task, which cannot be used to access the task-list
2087 * via next_thread().
2088 */
2089 if (pid_alive(task)) do {
2090 int tid = task->pid;
2091
2092 if (--index >= 0)
2093 continue;
Daniel Drakef2463152005-05-01 08:59:03 -07002094 if (tids != NULL)
2095 tids[nr_tids] = tid;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002096 nr_tids++;
2097 if (nr_tids >= PROC_MAXPIDS)
2098 break;
2099 } while ((task = next_thread(task)) != leader_task);
2100 read_unlock(&tasklist_lock);
2101 return nr_tids;
2102}
2103
2104/* for the /proc/ directory itself, after non-process stuff has been done */
2105int proc_pid_readdir(struct file * filp, void * dirent, filldir_t filldir)
2106{
2107 unsigned int tgid_array[PROC_MAXPIDS];
2108 char buf[PROC_NUMBUF];
2109 unsigned int nr = filp->f_pos - FIRST_PROCESS_ENTRY;
2110 unsigned int nr_tgids, i;
2111 int next_tgid;
2112
2113 if (!nr) {
2114 ino_t ino = fake_ino(0,PROC_TGID_INO);
2115 if (filldir(dirent, "self", 4, filp->f_pos, ino, DT_LNK) < 0)
2116 return 0;
2117 filp->f_pos++;
2118 nr++;
2119 }
2120
2121 /* f_version caches the tgid value that the last readdir call couldn't
2122 * return. lseek aka telldir automagically resets f_version to 0.
2123 */
2124 next_tgid = filp->f_version;
2125 filp->f_version = 0;
2126 for (;;) {
2127 nr_tgids = get_tgid_list(nr, next_tgid, tgid_array);
2128 if (!nr_tgids) {
2129 /* no more entries ! */
2130 break;
2131 }
2132 next_tgid = 0;
2133
2134 /* do not use the last found pid, reserve it for next_tgid */
2135 if (nr_tgids == PROC_MAXPIDS) {
2136 nr_tgids--;
2137 next_tgid = tgid_array[nr_tgids];
2138 }
2139
2140 for (i=0;i<nr_tgids;i++) {
2141 int tgid = tgid_array[i];
2142 ino_t ino = fake_ino(tgid,PROC_TGID_INO);
2143 unsigned long j = PROC_NUMBUF;
2144
2145 do
2146 buf[--j] = '0' + (tgid % 10);
2147 while ((tgid /= 10) != 0);
2148
2149 if (filldir(dirent, buf+j, PROC_NUMBUF-j, filp->f_pos, ino, DT_DIR) < 0) {
2150 /* returning this tgid failed, save it as the first
2151 * pid for the next readir call */
2152 filp->f_version = tgid_array[i];
2153 goto out;
2154 }
2155 filp->f_pos++;
2156 nr++;
2157 }
2158 }
2159out:
2160 return 0;
2161}
2162
2163/* for the /proc/TGID/task/ directories */
2164static int proc_task_readdir(struct file * filp, void * dirent, filldir_t filldir)
2165{
2166 unsigned int tid_array[PROC_MAXPIDS];
2167 char buf[PROC_NUMBUF];
2168 unsigned int nr_tids, i;
2169 struct dentry *dentry = filp->f_dentry;
2170 struct inode *inode = dentry->d_inode;
2171 int retval = -ENOENT;
2172 ino_t ino;
2173 unsigned long pos = filp->f_pos; /* avoiding "long long" filp->f_pos */
2174
2175 if (!pid_alive(proc_task(inode)))
2176 goto out;
2177 retval = 0;
2178
2179 switch (pos) {
2180 case 0:
2181 ino = inode->i_ino;
2182 if (filldir(dirent, ".", 1, pos, ino, DT_DIR) < 0)
2183 goto out;
2184 pos++;
2185 /* fall through */
2186 case 1:
2187 ino = parent_ino(dentry);
2188 if (filldir(dirent, "..", 2, pos, ino, DT_DIR) < 0)
2189 goto out;
2190 pos++;
2191 /* fall through */
2192 }
2193
2194 nr_tids = get_tid_list(pos, tid_array, inode);
Daniel Drakef2463152005-05-01 08:59:03 -07002195 inode->i_nlink = pos + nr_tids;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002196
2197 for (i = 0; i < nr_tids; i++) {
2198 unsigned long j = PROC_NUMBUF;
2199 int tid = tid_array[i];
2200
2201 ino = fake_ino(tid,PROC_TID_INO);
2202
2203 do
2204 buf[--j] = '0' + (tid % 10);
2205 while ((tid /= 10) != 0);
2206
2207 if (filldir(dirent, buf+j, PROC_NUMBUF-j, pos, ino, DT_DIR) < 0)
2208 break;
2209 pos++;
2210 }
2211out:
2212 filp->f_pos = pos;
2213 return retval;
2214}