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V4L/DVB (3965): Fix CONFIG_VIDEO_VIVI=y build bug
[linux-2.6/sactl.git] / fs / proc / base.c
blob6cc77dc3f3ff79c49fa7d4ce89360b595995d839
1 /*
2 * linux/fs/proc/base.c
3 *
4 * Copyright (C) 1991, 1992 Linus Torvalds
5 *
6 * proc base directory handling functions
7 *
8 * 1999, Al Viro. Rewritten. Now it covers the whole per-process part.
9 * Instead of using magical inumbers to determine the kind of object
10 * we allocate and fill in-core inodes upon lookup. They don't even
11 * go into icache. We cache the reference to task_struct upon lookup too.
12 * Eventually it should become a filesystem in its own. We don't use the
13 * rest of procfs anymore.
14 *
15 *
16 * Changelog:
17 * 17-Jan-2005
18 * Allan Bezerra
19 * Bruna Moreira <bruna.moreira@indt.org.br>
20 * Edjard Mota <edjard.mota@indt.org.br>
21 * Ilias Biris <ilias.biris@indt.org.br>
22 * Mauricio Lin <mauricio.lin@indt.org.br>
23 *
24 * Embedded Linux Lab - 10LE Instituto Nokia de Tecnologia - INdT
25 *
26 * A new process specific entry (smaps) included in /proc. It shows the
27 * size of rss for each memory area. The maps entry lacks information
28 * about physical memory size (rss) for each mapped file, i.e.,
29 * rss information for executables and library files.
30 * This additional information is useful for any tools that need to know
31 * about physical memory consumption for a process specific library.
32 *
33 * Changelog:
34 * 21-Feb-2005
35 * Embedded Linux Lab - 10LE Instituto Nokia de Tecnologia - INdT
36 * Pud inclusion in the page table walking.
37 *
38 * ChangeLog:
39 * 10-Mar-2005
40 * 10LE Instituto Nokia de Tecnologia - INdT:
41 * A better way to walks through the page table as suggested by Hugh Dickins.
42 *
43 * Simo Piiroinen <simo.piiroinen@nokia.com>:
44 * Smaps information related to shared, private, clean and dirty pages.
45 *
46 * Paul Mundt <paul.mundt@nokia.com>:
47 * Overall revision about smaps.
48 */
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/capability.h>
59 #include <linux/file.h>
60 #include <linux/string.h>
61 #include <linux/seq_file.h>
62 #include <linux/namei.h>
63 #include <linux/namespace.h>
64 #include <linux/mm.h>
65 #include <linux/smp_lock.h>
66 #include <linux/rcupdate.h>
67 #include <linux/kallsyms.h>
68 #include <linux/mount.h>
69 #include <linux/security.h>
70 #include <linux/ptrace.h>
71 #include <linux/seccomp.h>
72 #include <linux/cpuset.h>
73 #include <linux/audit.h>
74 #include <linux/poll.h>
75 #include "internal.h"
76
77 /*
78 * For hysterical raisins we keep the same inumbers as in the old procfs.
79 * Feel free to change the macro below - just keep the range distinct from
80 * inumbers of the rest of procfs (currently those are in 0x0000--0xffff).
81 * As soon as we'll get a separate superblock we will be able to forget
82 * about magical ranges too.
83 */
84
85 #define fake_ino(pid,ino) (((pid)<<16)|(ino))
86
87 enum pid_directory_inos {
88 PROC_TGID_INO = 2,
89 PROC_TGID_TASK,
90 PROC_TGID_STATUS,
91 PROC_TGID_MEM,
92 #ifdef CONFIG_SECCOMP
93 PROC_TGID_SECCOMP,
94 #endif
95 PROC_TGID_CWD,
96 PROC_TGID_ROOT,
97 PROC_TGID_EXE,
98 PROC_TGID_FD,
99 PROC_TGID_ENVIRON,
100 PROC_TGID_AUXV,
101 PROC_TGID_CMDLINE,
102 PROC_TGID_STAT,
103 PROC_TGID_STATM,
104 PROC_TGID_MAPS,
105 PROC_TGID_NUMA_MAPS,
106 PROC_TGID_MOUNTS,
107 PROC_TGID_MOUNTSTATS,
108 PROC_TGID_WCHAN,
109 #ifdef CONFIG_MMU
110 PROC_TGID_SMAPS,
111 #endif
112 #ifdef CONFIG_SCHEDSTATS
113 PROC_TGID_SCHEDSTAT,
114 #endif
115 #ifdef CONFIG_CPUSETS
116 PROC_TGID_CPUSET,
117 #endif
118 #ifdef CONFIG_SECURITY
119 PROC_TGID_ATTR,
120 PROC_TGID_ATTR_CURRENT,
121 PROC_TGID_ATTR_PREV,
122 PROC_TGID_ATTR_EXEC,
123 PROC_TGID_ATTR_FSCREATE,
124 #endif
125 #ifdef CONFIG_AUDITSYSCALL
126 PROC_TGID_LOGINUID,
127 #endif
128 PROC_TGID_OOM_SCORE,
129 PROC_TGID_OOM_ADJUST,
130 PROC_TID_INO,
131 PROC_TID_STATUS,
132 PROC_TID_MEM,
133 #ifdef CONFIG_SECCOMP
134 PROC_TID_SECCOMP,
135 #endif
136 PROC_TID_CWD,
137 PROC_TID_ROOT,
138 PROC_TID_EXE,
139 PROC_TID_FD,
140 PROC_TID_ENVIRON,
141 PROC_TID_AUXV,
142 PROC_TID_CMDLINE,
143 PROC_TID_STAT,
144 PROC_TID_STATM,
145 PROC_TID_MAPS,
146 PROC_TID_NUMA_MAPS,
147 PROC_TID_MOUNTS,
148 PROC_TID_MOUNTSTATS,
149 PROC_TID_WCHAN,
150 #ifdef CONFIG_MMU
151 PROC_TID_SMAPS,
152 #endif
153 #ifdef CONFIG_SCHEDSTATS
154 PROC_TID_SCHEDSTAT,
155 #endif
156 #ifdef CONFIG_CPUSETS
157 PROC_TID_CPUSET,
158 #endif
159 #ifdef CONFIG_SECURITY
160 PROC_TID_ATTR,
161 PROC_TID_ATTR_CURRENT,
162 PROC_TID_ATTR_PREV,
163 PROC_TID_ATTR_EXEC,
164 PROC_TID_ATTR_FSCREATE,
165 #endif
166 #ifdef CONFIG_AUDITSYSCALL
167 PROC_TID_LOGINUID,
168 #endif
169 PROC_TID_OOM_SCORE,
170 PROC_TID_OOM_ADJUST,
171
172 /* Add new entries before this */
173 PROC_TID_FD_DIR = 0x8000, /* 0x8000-0xffff */
174 };
175
176 struct pid_entry {
177 int type;
178 int len;
179 char *name;
180 mode_t mode;
181 };
182
183 #define E(type,name,mode) {(type),sizeof(name)-1,(name),(mode)}
184
185 static struct pid_entry tgid_base_stuff[] = {
186 E(PROC_TGID_TASK, "task", S_IFDIR|S_IRUGO|S_IXUGO),
187 E(PROC_TGID_FD, "fd", S_IFDIR|S_IRUSR|S_IXUSR),
188 E(PROC_TGID_ENVIRON, "environ", S_IFREG|S_IRUSR),
189 E(PROC_TGID_AUXV, "auxv", S_IFREG|S_IRUSR),
190 E(PROC_TGID_STATUS, "status", S_IFREG|S_IRUGO),
191 E(PROC_TGID_CMDLINE, "cmdline", S_IFREG|S_IRUGO),
192 E(PROC_TGID_STAT, "stat", S_IFREG|S_IRUGO),
193 E(PROC_TGID_STATM, "statm", S_IFREG|S_IRUGO),
194 E(PROC_TGID_MAPS, "maps", S_IFREG|S_IRUGO),
195 #ifdef CONFIG_NUMA
196 E(PROC_TGID_NUMA_MAPS, "numa_maps", S_IFREG|S_IRUGO),
197 #endif
198 E(PROC_TGID_MEM, "mem", S_IFREG|S_IRUSR|S_IWUSR),
199 #ifdef CONFIG_SECCOMP
200 E(PROC_TGID_SECCOMP, "seccomp", S_IFREG|S_IRUSR|S_IWUSR),
201 #endif
202 E(PROC_TGID_CWD, "cwd", S_IFLNK|S_IRWXUGO),
203 E(PROC_TGID_ROOT, "root", S_IFLNK|S_IRWXUGO),
204 E(PROC_TGID_EXE, "exe", S_IFLNK|S_IRWXUGO),
205 E(PROC_TGID_MOUNTS, "mounts", S_IFREG|S_IRUGO),
206 E(PROC_TGID_MOUNTSTATS, "mountstats", S_IFREG|S_IRUSR),
207 #ifdef CONFIG_MMU
208 E(PROC_TGID_SMAPS, "smaps", S_IFREG|S_IRUGO),
209 #endif
210 #ifdef CONFIG_SECURITY
211 E(PROC_TGID_ATTR, "attr", S_IFDIR|S_IRUGO|S_IXUGO),
212 #endif
213 #ifdef CONFIG_KALLSYMS
214 E(PROC_TGID_WCHAN, "wchan", S_IFREG|S_IRUGO),
215 #endif
216 #ifdef CONFIG_SCHEDSTATS
217 E(PROC_TGID_SCHEDSTAT, "schedstat", S_IFREG|S_IRUGO),
218 #endif
219 #ifdef CONFIG_CPUSETS
220 E(PROC_TGID_CPUSET, "cpuset", S_IFREG|S_IRUGO),
221 #endif
222 E(PROC_TGID_OOM_SCORE, "oom_score",S_IFREG|S_IRUGO),
223 E(PROC_TGID_OOM_ADJUST,"oom_adj", S_IFREG|S_IRUGO|S_IWUSR),
224 #ifdef CONFIG_AUDITSYSCALL
225 E(PROC_TGID_LOGINUID, "loginuid", S_IFREG|S_IWUSR|S_IRUGO),
226 #endif
227 {0,0,NULL,0}
228 };
229 static struct pid_entry tid_base_stuff[] = {
230 E(PROC_TID_FD, "fd", S_IFDIR|S_IRUSR|S_IXUSR),
231 E(PROC_TID_ENVIRON, "environ", S_IFREG|S_IRUSR),
232 E(PROC_TID_AUXV, "auxv", S_IFREG|S_IRUSR),
233 E(PROC_TID_STATUS, "status", S_IFREG|S_IRUGO),
234 E(PROC_TID_CMDLINE, "cmdline", S_IFREG|S_IRUGO),
235 E(PROC_TID_STAT, "stat", S_IFREG|S_IRUGO),
236 E(PROC_TID_STATM, "statm", S_IFREG|S_IRUGO),
237 E(PROC_TID_MAPS, "maps", S_IFREG|S_IRUGO),
238 #ifdef CONFIG_NUMA
239 E(PROC_TID_NUMA_MAPS, "numa_maps", S_IFREG|S_IRUGO),
240 #endif
241 E(PROC_TID_MEM, "mem", S_IFREG|S_IRUSR|S_IWUSR),
242 #ifdef CONFIG_SECCOMP
243 E(PROC_TID_SECCOMP, "seccomp", S_IFREG|S_IRUSR|S_IWUSR),
244 #endif
245 E(PROC_TID_CWD, "cwd", S_IFLNK|S_IRWXUGO),
246 E(PROC_TID_ROOT, "root", S_IFLNK|S_IRWXUGO),
247 E(PROC_TID_EXE, "exe", S_IFLNK|S_IRWXUGO),
248 E(PROC_TID_MOUNTS, "mounts", S_IFREG|S_IRUGO),
249 #ifdef CONFIG_MMU
250 E(PROC_TID_SMAPS, "smaps", S_IFREG|S_IRUGO),
251 #endif
252 #ifdef CONFIG_SECURITY
253 E(PROC_TID_ATTR, "attr", S_IFDIR|S_IRUGO|S_IXUGO),
254 #endif
255 #ifdef CONFIG_KALLSYMS
256 E(PROC_TID_WCHAN, "wchan", S_IFREG|S_IRUGO),
257 #endif
258 #ifdef CONFIG_SCHEDSTATS
259 E(PROC_TID_SCHEDSTAT, "schedstat",S_IFREG|S_IRUGO),
260 #endif
261 #ifdef CONFIG_CPUSETS
262 E(PROC_TID_CPUSET, "cpuset", S_IFREG|S_IRUGO),
263 #endif
264 E(PROC_TID_OOM_SCORE, "oom_score",S_IFREG|S_IRUGO),
265 E(PROC_TID_OOM_ADJUST, "oom_adj", S_IFREG|S_IRUGO|S_IWUSR),
266 #ifdef CONFIG_AUDITSYSCALL
267 E(PROC_TID_LOGINUID, "loginuid", S_IFREG|S_IWUSR|S_IRUGO),
268 #endif
269 {0,0,NULL,0}
270 };
271
272 #ifdef CONFIG_SECURITY
273 static struct pid_entry tgid_attr_stuff[] = {
274 E(PROC_TGID_ATTR_CURRENT, "current", S_IFREG|S_IRUGO|S_IWUGO),
275 E(PROC_TGID_ATTR_PREV, "prev", S_IFREG|S_IRUGO),
276 E(PROC_TGID_ATTR_EXEC, "exec", S_IFREG|S_IRUGO|S_IWUGO),
277 E(PROC_TGID_ATTR_FSCREATE, "fscreate", S_IFREG|S_IRUGO|S_IWUGO),
278 {0,0,NULL,0}
279 };
280 static struct pid_entry tid_attr_stuff[] = {
281 E(PROC_TID_ATTR_CURRENT, "current", S_IFREG|S_IRUGO|S_IWUGO),
282 E(PROC_TID_ATTR_PREV, "prev", S_IFREG|S_IRUGO),
283 E(PROC_TID_ATTR_EXEC, "exec", S_IFREG|S_IRUGO|S_IWUGO),
284 E(PROC_TID_ATTR_FSCREATE, "fscreate", S_IFREG|S_IRUGO|S_IWUGO),
285 {0,0,NULL,0}
286 };
287 #endif
288
289 #undef E
290
291 static int proc_fd_link(struct inode *inode, struct dentry **dentry, struct vfsmount **mnt)
292 {
293 struct task_struct *task = proc_task(inode);
294 struct files_struct *files;
295 struct file *file;
296 int fd = proc_type(inode) - PROC_TID_FD_DIR;
297
298 files = get_files_struct(task);
299 if (files) {
300 /*
301 * We are not taking a ref to the file structure, so we must
302 * hold ->file_lock.
303 */
304 spin_lock(&files->file_lock);
305 file = fcheck_files(files, fd);
306 if (file) {
307 *mnt = mntget(file->f_vfsmnt);
308 *dentry = dget(file->f_dentry);
309 spin_unlock(&files->file_lock);
310 put_files_struct(files);
311 return 0;
312 }
313 spin_unlock(&files->file_lock);
314 put_files_struct(files);
315 }
316 return -ENOENT;
317 }
318
319 static struct fs_struct *get_fs_struct(struct task_struct *task)
320 {
321 struct fs_struct *fs;
322 task_lock(task);
323 fs = task->fs;
324 if(fs)
325 atomic_inc(&fs->count);
326 task_unlock(task);
327 return fs;
328 }
329
330 static int proc_cwd_link(struct inode *inode, struct dentry **dentry, struct vfsmount **mnt)
331 {
332 struct fs_struct *fs = get_fs_struct(proc_task(inode));
333 int result = -ENOENT;
334 if (fs) {
335 read_lock(&fs->lock);
336 *mnt = mntget(fs->pwdmnt);
337 *dentry = dget(fs->pwd);
338 read_unlock(&fs->lock);
339 result = 0;
340 put_fs_struct(fs);
341 }
342 return result;
343 }
344
345 static int proc_root_link(struct inode *inode, struct dentry **dentry, struct vfsmount **mnt)
346 {
347 struct fs_struct *fs = get_fs_struct(proc_task(inode));
348 int result = -ENOENT;
349 if (fs) {
350 read_lock(&fs->lock);
351 *mnt = mntget(fs->rootmnt);
352 *dentry = dget(fs->root);
353 read_unlock(&fs->lock);
354 result = 0;
355 put_fs_struct(fs);
356 }
357 return result;
358 }
359
360
361 /* Same as proc_root_link, but this addionally tries to get fs from other
362 * threads in the group */
363 static int proc_task_root_link(struct inode *inode, struct dentry **dentry,
364 struct vfsmount **mnt)
365 {
366 struct fs_struct *fs;
367 int result = -ENOENT;
368 struct task_struct *leader = proc_task(inode);
369
370 task_lock(leader);
371 fs = leader->fs;
372 if (fs) {
373 atomic_inc(&fs->count);
374 task_unlock(leader);
375 } else {
376 /* Try to get fs from other threads */
377 task_unlock(leader);
378 read_lock(&tasklist_lock);
379 if (pid_alive(leader)) {
380 struct task_struct *task = leader;
381
382 while ((task = next_thread(task)) != leader) {
383 task_lock(task);
384 fs = task->fs;
385 if (fs) {
386 atomic_inc(&fs->count);
387 task_unlock(task);
388 break;
389 }
390 task_unlock(task);
391 }
392 }
393 read_unlock(&tasklist_lock);
394 }
395
396 if (fs) {
397 read_lock(&fs->lock);
398 *mnt = mntget(fs->rootmnt);
399 *dentry = dget(fs->root);
400 read_unlock(&fs->lock);
401 result = 0;
402 put_fs_struct(fs);
403 }
404 return result;
405 }
406
407
408 #define MAY_PTRACE(task) \
409 (task == current || \
410 (task->parent == current && \
411 (task->ptrace & PT_PTRACED) && \
412 (task->state == TASK_STOPPED || task->state == TASK_TRACED) && \
413 security_ptrace(current,task) == 0))
414
415 static int proc_pid_environ(struct task_struct *task, char * buffer)
416 {
417 int res = 0;
418 struct mm_struct *mm = get_task_mm(task);
419 if (mm) {
420 unsigned int len = mm->env_end - mm->env_start;
421 if (len > PAGE_SIZE)
422 len = PAGE_SIZE;
423 res = access_process_vm(task, mm->env_start, buffer, len, 0);
424 if (!ptrace_may_attach(task))
425 res = -ESRCH;
426 mmput(mm);
427 }
428 return res;
429 }
430
431 static int proc_pid_cmdline(struct task_struct *task, char * buffer)
432 {
433 int res = 0;
434 unsigned int len;
435 struct mm_struct *mm = get_task_mm(task);
436 if (!mm)
437 goto out;
438 if (!mm->arg_end)
439 goto out_mm; /* Shh! No looking before we're done */
440
441 len = mm->arg_end - mm->arg_start;
442
443 if (len > PAGE_SIZE)
444 len = PAGE_SIZE;
445
446 res = access_process_vm(task, mm->arg_start, buffer, len, 0);
447
448 // If the nul at the end of args has been overwritten, then
449 // assume application is using setproctitle(3).
450 if (res > 0 && buffer[res-1] != '\0' && len < PAGE_SIZE) {
451 len = strnlen(buffer, res);
452 if (len < res) {
453 res = len;
454 } else {
455 len = mm->env_end - mm->env_start;
456 if (len > PAGE_SIZE - res)
457 len = PAGE_SIZE - res;
458 res += access_process_vm(task, mm->env_start, buffer+res, len, 0);
459 res = strnlen(buffer, res);
460 }
461 }
462 out_mm:
463 mmput(mm);
464 out:
465 return res;
466 }
467
468 static int proc_pid_auxv(struct task_struct *task, char *buffer)
469 {
470 int res = 0;
471 struct mm_struct *mm = get_task_mm(task);
472 if (mm) {
473 unsigned int nwords = 0;
474 do
475 nwords += 2;
476 while (mm->saved_auxv[nwords - 2] != 0); /* AT_NULL */
477 res = nwords * sizeof(mm->saved_auxv[0]);
478 if (res > PAGE_SIZE)
479 res = PAGE_SIZE;
480 memcpy(buffer, mm->saved_auxv, res);
481 mmput(mm);
482 }
483 return res;
484 }
485
486
487 #ifdef CONFIG_KALLSYMS
488 /*
489 * Provides a wchan file via kallsyms in a proper one-value-per-file format.
490 * Returns the resolved symbol. If that fails, simply return the address.
491 */
492 static int proc_pid_wchan(struct task_struct *task, char *buffer)
493 {
494 char *modname;
495 const char *sym_name;
496 unsigned long wchan, size, offset;
497 char namebuf[KSYM_NAME_LEN+1];
498
499 wchan = get_wchan(task);
500
501 sym_name = kallsyms_lookup(wchan, &size, &offset, &modname, namebuf);
502 if (sym_name)
503 return sprintf(buffer, "%s", sym_name);
504 return sprintf(buffer, "%lu", wchan);
505 }
506 #endif /* CONFIG_KALLSYMS */
507
508 #ifdef CONFIG_SCHEDSTATS
509 /*
510 * Provides /proc/PID/schedstat
511 */
512 static int proc_pid_schedstat(struct task_struct *task, char *buffer)
513 {
514 return sprintf(buffer, "%lu %lu %lu\n",
515 task->sched_info.cpu_time,
516 task->sched_info.run_delay,
517 task->sched_info.pcnt);
518 }
519 #endif
520
521 /* The badness from the OOM killer */
522 unsigned long badness(struct task_struct *p, unsigned long uptime);
523 static int proc_oom_score(struct task_struct *task, char *buffer)
524 {
525 unsigned long points;
526 struct timespec uptime;
527
528 do_posix_clock_monotonic_gettime(&uptime);
529 points = badness(task, uptime.tv_sec);
530 return sprintf(buffer, "%lu\n", points);
531 }
532
533 /************************************************************************/
534 /* Here the fs part begins */
535 /************************************************************************/
536
537 /* permission checks */
538
539 /* If the process being read is separated by chroot from the reading process,
540 * don't let the reader access the threads.
541 *
542 * note: this does dput(root) and mntput(vfsmnt) on exit.
543 */
544 static int proc_check_chroot(struct dentry *root, struct vfsmount *vfsmnt)
545 {
546 struct dentry *de, *base;
547 struct vfsmount *our_vfsmnt, *mnt;
548 int res = 0;
549
550 read_lock(&current->fs->lock);
551 our_vfsmnt = mntget(current->fs->rootmnt);
552 base = dget(current->fs->root);
553 read_unlock(&current->fs->lock);
554
555 spin_lock(&vfsmount_lock);
556 de = root;
557 mnt = vfsmnt;
558
559 while (mnt != our_vfsmnt) {
560 if (mnt == mnt->mnt_parent)
561 goto out;
562 de = mnt->mnt_mountpoint;
563 mnt = mnt->mnt_parent;
564 }
565
566 if (!is_subdir(de, base))
567 goto out;
568 spin_unlock(&vfsmount_lock);
569
570 exit:
571 dput(base);
572 mntput(our_vfsmnt);
573 dput(root);
574 mntput(vfsmnt);
575 return res;
576 out:
577 spin_unlock(&vfsmount_lock);
578 res = -EACCES;
579 goto exit;
580 }
581
582 static int proc_check_root(struct inode *inode)
583 {
584 struct dentry *root;
585 struct vfsmount *vfsmnt;
586
587 if (proc_root_link(inode, &root, &vfsmnt)) /* Ewww... */
588 return -ENOENT;
589 return proc_check_chroot(root, vfsmnt);
590 }
591
592 static int proc_permission(struct inode *inode, int mask, struct nameidata *nd)
593 {
594 if (generic_permission(inode, mask, NULL) != 0)
595 return -EACCES;
596 return proc_check_root(inode);
597 }
598
599 static int proc_task_permission(struct inode *inode, int mask, struct nameidata *nd)
600 {
601 struct dentry *root;
602 struct vfsmount *vfsmnt;
603
604 if (generic_permission(inode, mask, NULL) != 0)
605 return -EACCES;
606
607 if (proc_task_root_link(inode, &root, &vfsmnt))
608 return -ENOENT;
609
610 return proc_check_chroot(root, vfsmnt);
611 }
612
613 extern struct seq_operations proc_pid_maps_op;
614 static int maps_open(struct inode *inode, struct file *file)
615 {
616 struct task_struct *task = proc_task(inode);
617 int ret = seq_open(file, &proc_pid_maps_op);
618 if (!ret) {
619 struct seq_file *m = file->private_data;
620 m->private = task;
621 }
622 return ret;
623 }
624
625 static struct file_operations proc_maps_operations = {
626 .open = maps_open,
627 .read = seq_read,
628 .llseek = seq_lseek,
629 .release = seq_release,
630 };
631
632 #ifdef CONFIG_NUMA
633 extern struct seq_operations proc_pid_numa_maps_op;
634 static int numa_maps_open(struct inode *inode, struct file *file)
635 {
636 struct task_struct *task = proc_task(inode);
637 int ret = seq_open(file, &proc_pid_numa_maps_op);
638 if (!ret) {
639 struct seq_file *m = file->private_data;
640 m->private = task;
641 }
642 return ret;
643 }
644
645 static struct file_operations proc_numa_maps_operations = {
646 .open = numa_maps_open,
647 .read = seq_read,
648 .llseek = seq_lseek,
649 .release = seq_release,
650 };
651 #endif
652
653 #ifdef CONFIG_MMU
654 extern struct seq_operations proc_pid_smaps_op;
655 static int smaps_open(struct inode *inode, struct file *file)
656 {
657 struct task_struct *task = proc_task(inode);
658 int ret = seq_open(file, &proc_pid_smaps_op);
659 if (!ret) {
660 struct seq_file *m = file->private_data;
661 m->private = task;
662 }
663 return ret;
664 }
665
666 static struct file_operations proc_smaps_operations = {
667 .open = smaps_open,
668 .read = seq_read,
669 .llseek = seq_lseek,
670 .release = seq_release,
671 };
672 #endif
673
674 extern struct seq_operations mounts_op;
675 struct proc_mounts {
676 struct seq_file m;
677 int event;
678 };
679
680 static int mounts_open(struct inode *inode, struct file *file)
681 {
682 struct task_struct *task = proc_task(inode);
683 struct namespace *namespace;
684 struct proc_mounts *p;
685 int ret = -EINVAL;
686
687 task_lock(task);
688 namespace = task->namespace;
689 if (namespace)
690 get_namespace(namespace);
691 task_unlock(task);
692
693 if (namespace) {
694 ret = -ENOMEM;
695 p = kmalloc(sizeof(struct proc_mounts), GFP_KERNEL);
696 if (p) {
697 file->private_data = &p->m;
698 ret = seq_open(file, &mounts_op);
699 if (!ret) {
700 p->m.private = namespace;
701 p->event = namespace->event;
702 return 0;
703 }
704 kfree(p);
705 }
706 put_namespace(namespace);
707 }
708 return ret;
709 }
710
711 static int mounts_release(struct inode *inode, struct file *file)
712 {
713 struct seq_file *m = file->private_data;
714 struct namespace *namespace = m->private;
715 put_namespace(namespace);
716 return seq_release(inode, file);
717 }
718
719 static unsigned mounts_poll(struct file *file, poll_table *wait)
720 {
721 struct proc_mounts *p = file->private_data;
722 struct namespace *ns = p->m.private;
723 unsigned res = 0;
724
725 poll_wait(file, &ns->poll, wait);
726
727 spin_lock(&vfsmount_lock);
728 if (p->event != ns->event) {
729 p->event = ns->event;
730 res = POLLERR;
731 }
732 spin_unlock(&vfsmount_lock);
733
734 return res;
735 }
736
737 static struct file_operations proc_mounts_operations = {
738 .open = mounts_open,
739 .read = seq_read,
740 .llseek = seq_lseek,
741 .release = mounts_release,
742 .poll = mounts_poll,
743 };
744
745 extern struct seq_operations mountstats_op;
746 static int mountstats_open(struct inode *inode, struct file *file)
747 {
748 struct task_struct *task = proc_task(inode);
749 int ret = seq_open(file, &mountstats_op);
750
751 if (!ret) {
752 struct seq_file *m = file->private_data;
753 struct namespace *namespace;
754 task_lock(task);
755 namespace = task->namespace;
756 if (namespace)
757 get_namespace(namespace);
758 task_unlock(task);
759
760 if (namespace)
761 m->private = namespace;
762 else {
763 seq_release(inode, file);
764 ret = -EINVAL;
765 }
766 }
767 return ret;
768 }
769
770 static struct file_operations proc_mountstats_operations = {
771 .open = mountstats_open,
772 .read = seq_read,
773 .llseek = seq_lseek,
774 .release = mounts_release,
775 };
776
777 #define PROC_BLOCK_SIZE (3*1024) /* 4K page size but our output routines use some slack for overruns */
778
779 static ssize_t proc_info_read(struct file * file, char __user * buf,
780 size_t count, loff_t *ppos)
781 {
782 struct inode * inode = file->f_dentry->d_inode;
783 unsigned long page;
784 ssize_t length;
785 struct task_struct *task = proc_task(inode);
786
787 if (count > PROC_BLOCK_SIZE)
788 count = PROC_BLOCK_SIZE;
789 if (!(page = __get_free_page(GFP_KERNEL)))
790 return -ENOMEM;
791
792 length = PROC_I(inode)->op.proc_read(task, (char*)page);
793
794 if (length >= 0)
795 length = simple_read_from_buffer(buf, count, ppos, (char *)page, length);
796 free_page(page);
797 return length;
798 }
799
800 static struct file_operations proc_info_file_operations = {
801 .read = proc_info_read,
802 };
803
804 static int mem_open(struct inode* inode, struct file* file)
805 {
806 file->private_data = (void*)((long)current->self_exec_id);
807 return 0;
808 }
809
810 static ssize_t mem_read(struct file * file, char __user * buf,
811 size_t count, loff_t *ppos)
812 {
813 struct task_struct *task = proc_task(file->f_dentry->d_inode);
814 char *page;
815 unsigned long src = *ppos;
816 int ret = -ESRCH;
817 struct mm_struct *mm;
818
819 if (!MAY_PTRACE(task) || !ptrace_may_attach(task))
820 goto out;
821
822 ret = -ENOMEM;
823 page = (char *)__get_free_page(GFP_USER);
824 if (!page)
825 goto out;
826
827 ret = 0;
828
829 mm = get_task_mm(task);
830 if (!mm)
831 goto out_free;
832
833 ret = -EIO;
834
835 if (file->private_data != (void*)((long)current->self_exec_id))
836 goto out_put;
837
838 ret = 0;
839
840 while (count > 0) {
841 int this_len, retval;
842
843 this_len = (count > PAGE_SIZE) ? PAGE_SIZE : count;
844 retval = access_process_vm(task, src, page, this_len, 0);
845 if (!retval || !MAY_PTRACE(task) || !ptrace_may_attach(task)) {
846 if (!ret)
847 ret = -EIO;
848 break;
849 }
850
851 if (copy_to_user(buf, page, retval)) {
852 ret = -EFAULT;
853 break;
854 }
855
856 ret += retval;
857 src += retval;
858 buf += retval;
859 count -= retval;
860 }
861 *ppos = src;
862
863 out_put:
864 mmput(mm);
865 out_free:
866 free_page((unsigned long) page);
867 out:
868 return ret;
869 }
870
871 #define mem_write NULL
872
873 #ifndef mem_write
874 /* This is a security hazard */
875 static ssize_t mem_write(struct file * file, const char * buf,
876 size_t count, loff_t *ppos)
877 {
878 int copied = 0;
879 char *page;
880 struct task_struct *task = proc_task(file->f_dentry->d_inode);
881 unsigned long dst = *ppos;
882
883 if (!MAY_PTRACE(task) || !ptrace_may_attach(task))
884 return -ESRCH;
885
886 page = (char *)__get_free_page(GFP_USER);
887 if (!page)
888 return -ENOMEM;
889
890 while (count > 0) {
891 int this_len, retval;
892
893 this_len = (count > PAGE_SIZE) ? PAGE_SIZE : count;
894 if (copy_from_user(page, buf, this_len)) {
895 copied = -EFAULT;
896 break;
897 }
898 retval = access_process_vm(task, dst, page, this_len, 1);
899 if (!retval) {
900 if (!copied)
901 copied = -EIO;
902 break;
903 }
904 copied += retval;
905 buf += retval;
906 dst += retval;
907 count -= retval;
908 }
909 *ppos = dst;
910 free_page((unsigned long) page);
911 return copied;
912 }
913 #endif
914
915 static loff_t mem_lseek(struct file * file, loff_t offset, int orig)
916 {
917 switch (orig) {
918 case 0:
919 file->f_pos = offset;
920 break;
921 case 1:
922 file->f_pos += offset;
923 break;
924 default:
925 return -EINVAL;
926 }
927 force_successful_syscall_return();
928 return file->f_pos;
929 }
930
931 static struct file_operations proc_mem_operations = {
932 .llseek = mem_lseek,
933 .read = mem_read,
934 .write = mem_write,
935 .open = mem_open,
936 };
937
938 static ssize_t oom_adjust_read(struct file *file, char __user *buf,
939 size_t count, loff_t *ppos)
940 {
941 struct task_struct *task = proc_task(file->f_dentry->d_inode);
942 char buffer[8];
943 size_t len;
944 int oom_adjust = task->oomkilladj;
945 loff_t __ppos = *ppos;
946
947 len = sprintf(buffer, "%i\n", oom_adjust);
948 if (__ppos >= len)
949 return 0;
950 if (count > len-__ppos)
951 count = len-__ppos;
952 if (copy_to_user(buf, buffer + __ppos, count))
953 return -EFAULT;
954 *ppos = __ppos + count;
955 return count;
956 }
957
958 static ssize_t oom_adjust_write(struct file *file, const char __user *buf,
959 size_t count, loff_t *ppos)
960 {
961 struct task_struct *task = proc_task(file->f_dentry->d_inode);
962 char buffer[8], *end;
963 int oom_adjust;
964
965 if (!capable(CAP_SYS_RESOURCE))
966 return -EPERM;
967 memset(buffer, 0, 8);
968 if (count > 6)
969 count = 6;
970 if (copy_from_user(buffer, buf, count))
971 return -EFAULT;
972 oom_adjust = simple_strtol(buffer, &end, 0);
973 if ((oom_adjust < -16 || oom_adjust > 15) && oom_adjust != OOM_DISABLE)
974 return -EINVAL;
975 if (*end == '\n')
976 end++;
977 task->oomkilladj = oom_adjust;
978 if (end - buffer == 0)
979 return -EIO;
980 return end - buffer;
981 }
982
983 static struct file_operations proc_oom_adjust_operations = {
984 .read = oom_adjust_read,
985 .write = oom_adjust_write,
986 };
987
988 static struct inode_operations proc_mem_inode_operations = {
989 .permission = proc_permission,
990 };
991
992 #ifdef CONFIG_AUDITSYSCALL
993 #define TMPBUFLEN 21
994 static ssize_t proc_loginuid_read(struct file * file, char __user * buf,
995 size_t count, loff_t *ppos)
996 {
997 struct inode * inode = file->f_dentry->d_inode;
998 struct task_struct *task = proc_task(inode);
999 ssize_t length;
1000 char tmpbuf[TMPBUFLEN];
1001
1002 length = scnprintf(tmpbuf, TMPBUFLEN, "%u",
1003 audit_get_loginuid(task->audit_context));
1004 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1005 }
1006
1007 static ssize_t proc_loginuid_write(struct file * file, const char __user * buf,
1008 size_t count, loff_t *ppos)
1009 {
1010 struct inode * inode = file->f_dentry->d_inode;
1011 char *page, *tmp;
1012 ssize_t length;
1013 struct task_struct *task = proc_task(inode);
1014 uid_t loginuid;
1015
1016 if (!capable(CAP_AUDIT_CONTROL))
1017 return -EPERM;
1018
1019 if (current != task)
1020 return -EPERM;
1021
1022 if (count > PAGE_SIZE)
1023 count = PAGE_SIZE;
1024
1025 if (*ppos != 0) {
1026 /* No partial writes. */
1027 return -EINVAL;
1028 }
1029 page = (char*)__get_free_page(GFP_USER);
1030 if (!page)
1031 return -ENOMEM;
1032 length = -EFAULT;
1033 if (copy_from_user(page, buf, count))
1034 goto out_free_page;
1035
1036 loginuid = simple_strtoul(page, &tmp, 10);
1037 if (tmp == page) {
1038 length = -EINVAL;
1039 goto out_free_page;
1040
1041 }
1042 length = audit_set_loginuid(task, loginuid);
1043 if (likely(length == 0))
1044 length = count;
1045
1046 out_free_page:
1047 free_page((unsigned long) page);
1048 return length;
1049 }
1050
1051 static struct file_operations proc_loginuid_operations = {
1052 .read = proc_loginuid_read,
1053 .write = proc_loginuid_write,
1054 };
1055 #endif
1056
1057 #ifdef CONFIG_SECCOMP
1058 static ssize_t seccomp_read(struct file *file, char __user *buf,
1059 size_t count, loff_t *ppos)
1060 {
1061 struct task_struct *tsk = proc_task(file->f_dentry->d_inode);
1062 char __buf[20];
1063 loff_t __ppos = *ppos;
1064 size_t len;
1065
1066 /* no need to print the trailing zero, so use only len */
1067 len = sprintf(__buf, "%u\n", tsk->seccomp.mode);
1068 if (__ppos >= len)
1069 return 0;
1070 if (count > len - __ppos)
1071 count = len - __ppos;
1072 if (copy_to_user(buf, __buf + __ppos, count))
1073 return -EFAULT;
1074 *ppos = __ppos + count;
1075 return count;
1076 }
1077
1078 static ssize_t seccomp_write(struct file *file, const char __user *buf,
1079 size_t count, loff_t *ppos)
1080 {
1081 struct task_struct *tsk = proc_task(file->f_dentry->d_inode);
1082 char __buf[20], *end;
1083 unsigned int seccomp_mode;
1084
1085 /* can set it only once to be even more secure */
1086 if (unlikely(tsk->seccomp.mode))
1087 return -EPERM;
1088
1089 memset(__buf, 0, sizeof(__buf));
1090 count = min(count, sizeof(__buf) - 1);
1091 if (copy_from_user(__buf, buf, count))
1092 return -EFAULT;
1093 seccomp_mode = simple_strtoul(__buf, &end, 0);
1094 if (*end == '\n')
1095 end++;
1096 if (seccomp_mode && seccomp_mode <= NR_SECCOMP_MODES) {
1097 tsk->seccomp.mode = seccomp_mode;
1098 set_tsk_thread_flag(tsk, TIF_SECCOMP);
1099 } else
1100 return -EINVAL;
1101 if (unlikely(!(end - __buf)))
1102 return -EIO;
1103 return end - __buf;
1104 }
1105
1106 static struct file_operations proc_seccomp_operations = {
1107 .read = seccomp_read,
1108 .write = seccomp_write,
1109 };
1110 #endif /* CONFIG_SECCOMP */
1111
1112 static void *proc_pid_follow_link(struct dentry *dentry, struct nameidata *nd)
1113 {
1114 struct inode *inode = dentry->d_inode;
1115 int error = -EACCES;
1116
1117 /* We don't need a base pointer in the /proc filesystem */
1118 path_release(nd);
1119
1120 if (current->fsuid != inode->i_uid && !capable(CAP_DAC_OVERRIDE))
1121 goto out;
1122 error = proc_check_root(inode);
1123 if (error)
1124 goto out;
1125
1126 error = PROC_I(inode)->op.proc_get_link(inode, &nd->dentry, &nd->mnt);
1127 nd->last_type = LAST_BIND;
1128 out:
1129 return ERR_PTR(error);
1130 }
1131
1132 static int do_proc_readlink(struct dentry *dentry, struct vfsmount *mnt,
1133 char __user *buffer, int buflen)
1134 {
1135 struct inode * inode;
1136 char *tmp = (char*)__get_free_page(GFP_KERNEL), *path;
1137 int len;
1138
1139 if (!tmp)
1140 return -ENOMEM;
1141
1142 inode = dentry->d_inode;
1143 path = d_path(dentry, mnt, tmp, PAGE_SIZE);
1144 len = PTR_ERR(path);
1145 if (IS_ERR(path))
1146 goto out;
1147 len = tmp + PAGE_SIZE - 1 - path;
1148
1149 if (len > buflen)
1150 len = buflen;
1151 if (copy_to_user(buffer, path, len))
1152 len = -EFAULT;
1153 out:
1154 free_page((unsigned long)tmp);
1155 return len;
1156 }
1157
1158 static int proc_pid_readlink(struct dentry * dentry, char __user * buffer, int buflen)
1159 {
1160 int error = -EACCES;
1161 struct inode *inode = dentry->d_inode;
1162 struct dentry *de;
1163 struct vfsmount *mnt = NULL;
1164
1165 lock_kernel();
1166
1167 if (current->fsuid != inode->i_uid && !capable(CAP_DAC_OVERRIDE))
1168 goto out;
1169 error = proc_check_root(inode);
1170 if (error)
1171 goto out;
1172
1173 error = PROC_I(inode)->op.proc_get_link(inode, &de, &mnt);
1174 if (error)
1175 goto out;
1176
1177 error = do_proc_readlink(de, mnt, buffer, buflen);
1178 dput(de);
1179 mntput(mnt);
1180 out:
1181 unlock_kernel();
1182 return error;
1183 }
1184
1185 static struct inode_operations proc_pid_link_inode_operations = {
1186 .readlink = proc_pid_readlink,
1187 .follow_link = proc_pid_follow_link
1188 };
1189
1190 #define NUMBUF 10
1191
1192 static int proc_readfd(struct file * filp, void * dirent, filldir_t filldir)
1193 {
1194 struct inode *inode = filp->f_dentry->d_inode;
1195 struct task_struct *p = proc_task(inode);
1196 unsigned int fd, tid, ino;
1197 int retval;
1198 char buf[NUMBUF];
1199 struct files_struct * files;
1200 struct fdtable *fdt;
1201
1202 retval = -ENOENT;
1203 if (!pid_alive(p))
1204 goto out;
1205 retval = 0;
1206 tid = p->pid;
1207
1208 fd = filp->f_pos;
1209 switch (fd) {
1210 case 0:
1211 if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0)
1212 goto out;
1213 filp->f_pos++;
1214 case 1:
1215 ino = fake_ino(tid, PROC_TID_INO);
1216 if (filldir(dirent, "..", 2, 1, ino, DT_DIR) < 0)
1217 goto out;
1218 filp->f_pos++;
1219 default:
1220 files = get_files_struct(p);
1221 if (!files)
1222 goto out;
1223 rcu_read_lock();
1224 fdt = files_fdtable(files);
1225 for (fd = filp->f_pos-2;
1226 fd < fdt->max_fds;
1227 fd++, filp->f_pos++) {
1228 unsigned int i,j;
1229
1230 if (!fcheck_files(files, fd))
1231 continue;
1232 rcu_read_unlock();
1233
1234 j = NUMBUF;
1235 i = fd;
1236 do {
1237 j--;
1238 buf[j] = '0' + (i % 10);
1239 i /= 10;
1240 } while (i);
1241
1242 ino = fake_ino(tid, PROC_TID_FD_DIR + fd);
1243 if (filldir(dirent, buf+j, NUMBUF-j, fd+2, ino, DT_LNK) < 0) {
1244 rcu_read_lock();
1245 break;
1246 }
1247 rcu_read_lock();
1248 }
1249 rcu_read_unlock();
1250 put_files_struct(files);
1251 }
1252 out:
1253 return retval;
1254 }
1255
1256 static int proc_pident_readdir(struct file *filp,
1257 void *dirent, filldir_t filldir,
1258 struct pid_entry *ents, unsigned int nents)
1259 {
1260 int i;
1261 int pid;
1262 struct dentry *dentry = filp->f_dentry;
1263 struct inode *inode = dentry->d_inode;
1264 struct pid_entry *p;
1265 ino_t ino;
1266 int ret;
1267
1268 ret = -ENOENT;
1269 if (!pid_alive(proc_task(inode)))
1270 goto out;
1271
1272 ret = 0;
1273 pid = proc_task(inode)->pid;
1274 i = filp->f_pos;
1275 switch (i) {
1276 case 0:
1277 ino = inode->i_ino;
1278 if (filldir(dirent, ".", 1, i, ino, DT_DIR) < 0)
1279 goto out;
1280 i++;
1281 filp->f_pos++;
1282 /* fall through */
1283 case 1:
1284 ino = parent_ino(dentry);
1285 if (filldir(dirent, "..", 2, i, ino, DT_DIR) < 0)
1286 goto out;
1287 i++;
1288 filp->f_pos++;
1289 /* fall through */
1290 default:
1291 i -= 2;
1292 if (i >= nents) {
1293 ret = 1;
1294 goto out;
1295 }
1296 p = ents + i;
1297 while (p->name) {
1298 if (filldir(dirent, p->name, p->len, filp->f_pos,
1299 fake_ino(pid, p->type), p->mode >> 12) < 0)
1300 goto out;
1301 filp->f_pos++;
1302 p++;
1303 }
1304 }
1305
1306 ret = 1;
1307 out:
1308 return ret;
1309 }
1310
1311 static int proc_tgid_base_readdir(struct file * filp,
1312 void * dirent, filldir_t filldir)
1313 {
1314 return proc_pident_readdir(filp,dirent,filldir,
1315 tgid_base_stuff,ARRAY_SIZE(tgid_base_stuff));
1316 }
1317
1318 static int proc_tid_base_readdir(struct file * filp,
1319 void * dirent, filldir_t filldir)
1320 {
1321 return proc_pident_readdir(filp,dirent,filldir,
1322 tid_base_stuff,ARRAY_SIZE(tid_base_stuff));
1323 }
1324
1325 /* building an inode */
1326
1327 static int task_dumpable(struct task_struct *task)
1328 {
1329 int dumpable = 0;
1330 struct mm_struct *mm;
1331
1332 task_lock(task);
1333 mm = task->mm;
1334 if (mm)
1335 dumpable = mm->dumpable;
1336 task_unlock(task);
1337 if(dumpable == 1)
1338 return 1;
1339 return 0;
1340 }
1341
1342
1343 static struct inode *proc_pid_make_inode(struct super_block * sb, struct task_struct *task, int ino)
1344 {
1345 struct inode * inode;
1346 struct proc_inode *ei;
1347
1348 /* We need a new inode */
1349
1350 inode = new_inode(sb);
1351 if (!inode)
1352 goto out;
1353
1354 /* Common stuff */
1355 ei = PROC_I(inode);
1356 ei->task = NULL;
1357 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
1358 inode->i_ino = fake_ino(task->pid, ino);
1359
1360 if (!pid_alive(task))
1361 goto out_unlock;
1362
1363 /*
1364 * grab the reference to task.
1365 */
1366 get_task_struct(task);
1367 ei->task = task;
1368 ei->type = ino;
1369 inode->i_uid = 0;
1370 inode->i_gid = 0;
1371 if (ino == PROC_TGID_INO || ino == PROC_TID_INO || task_dumpable(task)) {
1372 inode->i_uid = task->euid;
1373 inode->i_gid = task->egid;
1374 }
1375 security_task_to_inode(task, inode);
1376
1377 out:
1378 return inode;
1379
1380 out_unlock:
1381 ei->pde = NULL;
1382 iput(inode);
1383 return NULL;
1384 }
1385
1386 /* dentry stuff */
1387
1388 /*
1389 * Exceptional case: normally we are not allowed to unhash a busy
1390 * directory. In this case, however, we can do it - no aliasing problems
1391 * due to the way we treat inodes.
1392 *
1393 * Rewrite the inode's ownerships here because the owning task may have
1394 * performed a setuid(), etc.
1395 */
1396 static int pid_revalidate(struct dentry *dentry, struct nameidata *nd)
1397 {
1398 struct inode *inode = dentry->d_inode;
1399 struct task_struct *task = proc_task(inode);
1400 if (pid_alive(task)) {
1401 if (proc_type(inode) == PROC_TGID_INO || proc_type(inode) == PROC_TID_INO || task_dumpable(task)) {
1402 inode->i_uid = task->euid;
1403 inode->i_gid = task->egid;
1404 } else {
1405 inode->i_uid = 0;
1406 inode->i_gid = 0;
1407 }
1408 security_task_to_inode(task, inode);
1409 return 1;
1410 }
1411 d_drop(dentry);
1412 return 0;
1413 }
1414
1415 static int tid_fd_revalidate(struct dentry *dentry, struct nameidata *nd)
1416 {
1417 struct inode *inode = dentry->d_inode;
1418 struct task_struct *task = proc_task(inode);
1419 int fd = proc_type(inode) - PROC_TID_FD_DIR;
1420 struct files_struct *files;
1421
1422 files = get_files_struct(task);
1423 if (files) {
1424 rcu_read_lock();
1425 if (fcheck_files(files, fd)) {
1426 rcu_read_unlock();
1427 put_files_struct(files);
1428 if (task_dumpable(task)) {
1429 inode->i_uid = task->euid;
1430 inode->i_gid = task->egid;
1431 } else {
1432 inode->i_uid = 0;
1433 inode->i_gid = 0;
1434 }
1435 security_task_to_inode(task, inode);
1436 return 1;
1437 }
1438 rcu_read_unlock();
1439 put_files_struct(files);
1440 }
1441 d_drop(dentry);
1442 return 0;
1443 }
1444
1445 static void pid_base_iput(struct dentry *dentry, struct inode *inode)
1446 {
1447 struct task_struct *task = proc_task(inode);
1448 spin_lock(&task->proc_lock);
1449 if (task->proc_dentry == dentry)
1450 task->proc_dentry = NULL;
1451 spin_unlock(&task->proc_lock);
1452 iput(inode);
1453 }
1454
1455 static int pid_delete_dentry(struct dentry * dentry)
1456 {
1457 /* Is the task we represent dead?
1458 * If so, then don't put the dentry on the lru list,
1459 * kill it immediately.
1460 */
1461 return !pid_alive(proc_task(dentry->d_inode));
1462 }
1463
1464 static struct dentry_operations tid_fd_dentry_operations =
1465 {
1466 .d_revalidate = tid_fd_revalidate,
1467 .d_delete = pid_delete_dentry,
1468 };
1469
1470 static struct dentry_operations pid_dentry_operations =
1471 {
1472 .d_revalidate = pid_revalidate,
1473 .d_delete = pid_delete_dentry,
1474 };
1475
1476 static struct dentry_operations pid_base_dentry_operations =
1477 {
1478 .d_revalidate = pid_revalidate,
1479 .d_iput = pid_base_iput,
1480 .d_delete = pid_delete_dentry,
1481 };
1482
1483 /* Lookups */
1484
1485 static unsigned name_to_int(struct dentry *dentry)
1486 {
1487 const char *name = dentry->d_name.name;
1488 int len = dentry->d_name.len;
1489 unsigned n = 0;
1490
1491 if (len > 1 && *name == '0')
1492 goto out;
1493 while (len-- > 0) {
1494 unsigned c = *name++ - '0';
1495 if (c > 9)
1496 goto out;
1497 if (n >= (~0U-9)/10)
1498 goto out;
1499 n *= 10;
1500 n += c;
1501 }
1502 return n;
1503 out:
1504 return ~0U;
1505 }
1506
1507 /* SMP-safe */
1508 static struct dentry *proc_lookupfd(struct inode * dir, struct dentry * dentry, struct nameidata *nd)
1509 {
1510 struct task_struct *task = proc_task(dir);
1511 unsigned fd = name_to_int(dentry);
1512 struct file * file;
1513 struct files_struct * files;
1514 struct inode *inode;
1515 struct proc_inode *ei;
1516
1517 if (fd == ~0U)
1518 goto out;
1519 if (!pid_alive(task))
1520 goto out;
1521
1522 inode = proc_pid_make_inode(dir->i_sb, task, PROC_TID_FD_DIR+fd);
1523 if (!inode)
1524 goto out;
1525 ei = PROC_I(inode);
1526 files = get_files_struct(task);
1527 if (!files)
1528 goto out_unlock;
1529 inode->i_mode = S_IFLNK;
1530
1531 /*
1532 * We are not taking a ref to the file structure, so we must
1533 * hold ->file_lock.
1534 */
1535 spin_lock(&files->file_lock);
1536 file = fcheck_files(files, fd);
1537 if (!file)
1538 goto out_unlock2;
1539 if (file->f_mode & 1)
1540 inode->i_mode |= S_IRUSR | S_IXUSR;
1541 if (file->f_mode & 2)
1542 inode->i_mode |= S_IWUSR | S_IXUSR;
1543 spin_unlock(&files->file_lock);
1544 put_files_struct(files);
1545 inode->i_op = &proc_pid_link_inode_operations;
1546 inode->i_size = 64;
1547 ei->op.proc_get_link = proc_fd_link;
1548 dentry->d_op = &tid_fd_dentry_operations;
1549 d_add(dentry, inode);
1550 return NULL;
1551
1552 out_unlock2:
1553 spin_unlock(&files->file_lock);
1554 put_files_struct(files);
1555 out_unlock:
1556 iput(inode);
1557 out:
1558 return ERR_PTR(-ENOENT);
1559 }
1560
1561 static int proc_task_readdir(struct file * filp, void * dirent, filldir_t filldir);
1562 static struct dentry *proc_task_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd);
1563
1564 static struct file_operations proc_fd_operations = {
1565 .read = generic_read_dir,
1566 .readdir = proc_readfd,
1567 };
1568
1569 static struct file_operations proc_task_operations = {
1570 .read = generic_read_dir,
1571 .readdir = proc_task_readdir,
1572 };
1573
1574 /*
1575 * proc directories can do almost nothing..
1576 */
1577 static struct inode_operations proc_fd_inode_operations = {
1578 .lookup = proc_lookupfd,
1579 .permission = proc_permission,
1580 };
1581
1582 static struct inode_operations proc_task_inode_operations = {
1583 .lookup = proc_task_lookup,
1584 .permission = proc_task_permission,
1585 };
1586
1587 #ifdef CONFIG_SECURITY
1588 static ssize_t proc_pid_attr_read(struct file * file, char __user * buf,
1589 size_t count, loff_t *ppos)
1590 {
1591 struct inode * inode = file->f_dentry->d_inode;
1592 unsigned long page;
1593 ssize_t length;
1594 struct task_struct *task = proc_task(inode);
1595
1596 if (count > PAGE_SIZE)
1597 count = PAGE_SIZE;
1598 if (!(page = __get_free_page(GFP_KERNEL)))
1599 return -ENOMEM;
1600
1601 length = security_getprocattr(task,
1602 (char*)file->f_dentry->d_name.name,
1603 (void*)page, count);
1604 if (length >= 0)
1605 length = simple_read_from_buffer(buf, count, ppos, (char *)page, length);
1606 free_page(page);
1607 return length;
1608 }
1609
1610 static ssize_t proc_pid_attr_write(struct file * file, const char __user * buf,
1611 size_t count, loff_t *ppos)
1612 {
1613 struct inode * inode = file->f_dentry->d_inode;
1614 char *page;
1615 ssize_t length;
1616 struct task_struct *task = proc_task(inode);
1617
1618 if (count > PAGE_SIZE)
1619 count = PAGE_SIZE;
1620 if (*ppos != 0) {
1621 /* No partial writes. */
1622 return -EINVAL;
1623 }
1624 page = (char*)__get_free_page(GFP_USER);
1625 if (!page)
1626 return -ENOMEM;
1627 length = -EFAULT;
1628 if (copy_from_user(page, buf, count))
1629 goto out;
1630
1631 length = security_setprocattr(task,
1632 (char*)file->f_dentry->d_name.name,
1633 (void*)page, count);
1634 out:
1635 free_page((unsigned long) page);
1636 return length;
1637 }
1638
1639 static struct file_operations proc_pid_attr_operations = {
1640 .read = proc_pid_attr_read,
1641 .write = proc_pid_attr_write,
1642 };
1643
1644 static struct file_operations proc_tid_attr_operations;
1645 static struct inode_operations proc_tid_attr_inode_operations;
1646 static struct file_operations proc_tgid_attr_operations;
1647 static struct inode_operations proc_tgid_attr_inode_operations;
1648 #endif
1649
1650 static int get_tid_list(int index, unsigned int *tids, struct inode *dir);
1651
1652 /* SMP-safe */
1653 static struct dentry *proc_pident_lookup(struct inode *dir,
1654 struct dentry *dentry,
1655 struct pid_entry *ents)
1656 {
1657 struct inode *inode;
1658 int error;
1659 struct task_struct *task = proc_task(dir);
1660 struct pid_entry *p;
1661 struct proc_inode *ei;
1662
1663 error = -ENOENT;
1664 inode = NULL;
1665
1666 if (!pid_alive(task))
1667 goto out;
1668
1669 for (p = ents; p->name; p++) {
1670 if (p->len != dentry->d_name.len)
1671 continue;
1672 if (!memcmp(dentry->d_name.name, p->name, p->len))
1673 break;
1674 }
1675 if (!p->name)
1676 goto out;
1677
1678 error = -EINVAL;
1679 inode = proc_pid_make_inode(dir->i_sb, task, p->type);
1680 if (!inode)
1681 goto out;
1682
1683 ei = PROC_I(inode);
1684 inode->i_mode = p->mode;
1685 /*
1686 * Yes, it does not scale. And it should not. Don't add
1687 * new entries into /proc/<tgid>/ without very good reasons.
1688 */
1689 switch(p->type) {
1690 case PROC_TGID_TASK:
1691 inode->i_nlink = 2 + get_tid_list(2, NULL, dir);
1692 inode->i_op = &proc_task_inode_operations;
1693 inode->i_fop = &proc_task_operations;
1694 break;
1695 case PROC_TID_FD:
1696 case PROC_TGID_FD:
1697 inode->i_nlink = 2;
1698 inode->i_op = &proc_fd_inode_operations;
1699 inode->i_fop = &proc_fd_operations;
1700 break;
1701 case PROC_TID_EXE:
1702 case PROC_TGID_EXE:
1703 inode->i_op = &proc_pid_link_inode_operations;
1704 ei->op.proc_get_link = proc_exe_link;
1705 break;
1706 case PROC_TID_CWD:
1707 case PROC_TGID_CWD:
1708 inode->i_op = &proc_pid_link_inode_operations;
1709 ei->op.proc_get_link = proc_cwd_link;
1710 break;
1711 case PROC_TID_ROOT:
1712 case PROC_TGID_ROOT:
1713 inode->i_op = &proc_pid_link_inode_operations;
1714 ei->op.proc_get_link = proc_root_link;
1715 break;
1716 case PROC_TID_ENVIRON:
1717 case PROC_TGID_ENVIRON:
1718 inode->i_fop = &proc_info_file_operations;
1719 ei->op.proc_read = proc_pid_environ;
1720 break;
1721 case PROC_TID_AUXV:
1722 case PROC_TGID_AUXV:
1723 inode->i_fop = &proc_info_file_operations;
1724 ei->op.proc_read = proc_pid_auxv;
1725 break;
1726 case PROC_TID_STATUS:
1727 case PROC_TGID_STATUS:
1728 inode->i_fop = &proc_info_file_operations;
1729 ei->op.proc_read = proc_pid_status;
1730 break;
1731 case PROC_TID_STAT:
1732 inode->i_fop = &proc_info_file_operations;
1733 ei->op.proc_read = proc_tid_stat;
1734 break;
1735 case PROC_TGID_STAT:
1736 inode->i_fop = &proc_info_file_operations;
1737 ei->op.proc_read = proc_tgid_stat;
1738 break;
1739 case PROC_TID_CMDLINE:
1740 case PROC_TGID_CMDLINE:
1741 inode->i_fop = &proc_info_file_operations;
1742 ei->op.proc_read = proc_pid_cmdline;
1743 break;
1744 case PROC_TID_STATM:
1745 case PROC_TGID_STATM:
1746 inode->i_fop = &proc_info_file_operations;
1747 ei->op.proc_read = proc_pid_statm;
1748 break;
1749 case PROC_TID_MAPS:
1750 case PROC_TGID_MAPS:
1751 inode->i_fop = &proc_maps_operations;
1752 break;
1753 #ifdef CONFIG_NUMA
1754 case PROC_TID_NUMA_MAPS:
1755 case PROC_TGID_NUMA_MAPS:
1756 inode->i_fop = &proc_numa_maps_operations;
1757 break;
1758 #endif
1759 case PROC_TID_MEM:
1760 case PROC_TGID_MEM:
1761 inode->i_op = &proc_mem_inode_operations;
1762 inode->i_fop = &proc_mem_operations;
1763 break;
1764 #ifdef CONFIG_SECCOMP
1765 case PROC_TID_SECCOMP:
1766 case PROC_TGID_SECCOMP:
1767 inode->i_fop = &proc_seccomp_operations;
1768 break;
1769 #endif /* CONFIG_SECCOMP */
1770 case PROC_TID_MOUNTS:
1771 case PROC_TGID_MOUNTS:
1772 inode->i_fop = &proc_mounts_operations;
1773 break;
1774 #ifdef CONFIG_MMU
1775 case PROC_TID_SMAPS:
1776 case PROC_TGID_SMAPS:
1777 inode->i_fop = &proc_smaps_operations;
1778 break;
1779 #endif
1780 case PROC_TID_MOUNTSTATS:
1781 case PROC_TGID_MOUNTSTATS:
1782 inode->i_fop = &proc_mountstats_operations;
1783 break;
1784 #ifdef CONFIG_SECURITY
1785 case PROC_TID_ATTR:
1786 inode->i_nlink = 2;
1787 inode->i_op = &proc_tid_attr_inode_operations;
1788 inode->i_fop = &proc_tid_attr_operations;
1789 break;
1790 case PROC_TGID_ATTR:
1791 inode->i_nlink = 2;
1792 inode->i_op = &proc_tgid_attr_inode_operations;
1793 inode->i_fop = &proc_tgid_attr_operations;
1794 break;
1795 case PROC_TID_ATTR_CURRENT:
1796 case PROC_TGID_ATTR_CURRENT:
1797 case PROC_TID_ATTR_PREV:
1798 case PROC_TGID_ATTR_PREV:
1799 case PROC_TID_ATTR_EXEC:
1800 case PROC_TGID_ATTR_EXEC:
1801 case PROC_TID_ATTR_FSCREATE:
1802 case PROC_TGID_ATTR_FSCREATE:
1803 inode->i_fop = &proc_pid_attr_operations;
1804 break;
1805 #endif
1806 #ifdef CONFIG_KALLSYMS
1807 case PROC_TID_WCHAN:
1808 case PROC_TGID_WCHAN:
1809 inode->i_fop = &proc_info_file_operations;
1810 ei->op.proc_read = proc_pid_wchan;
1811 break;
1812 #endif
1813 #ifdef CONFIG_SCHEDSTATS
1814 case PROC_TID_SCHEDSTAT:
1815 case PROC_TGID_SCHEDSTAT:
1816 inode->i_fop = &proc_info_file_operations;
1817 ei->op.proc_read = proc_pid_schedstat;
1818 break;
1819 #endif
1820 #ifdef CONFIG_CPUSETS
1821 case PROC_TID_CPUSET:
1822 case PROC_TGID_CPUSET:
1823 inode->i_fop = &proc_cpuset_operations;
1824 break;
1825 #endif
1826 case PROC_TID_OOM_SCORE:
1827 case PROC_TGID_OOM_SCORE:
1828 inode->i_fop = &proc_info_file_operations;
1829 ei->op.proc_read = proc_oom_score;
1830 break;
1831 case PROC_TID_OOM_ADJUST:
1832 case PROC_TGID_OOM_ADJUST:
1833 inode->i_fop = &proc_oom_adjust_operations;
1834 break;
1835 #ifdef CONFIG_AUDITSYSCALL
1836 case PROC_TID_LOGINUID:
1837 case PROC_TGID_LOGINUID:
1838 inode->i_fop = &proc_loginuid_operations;
1839 break;
1840 #endif
1841 default:
1842 printk("procfs: impossible type (%d)",p->type);
1843 iput(inode);
1844 return ERR_PTR(-EINVAL);
1845 }
1846 dentry->d_op = &pid_dentry_operations;
1847 d_add(dentry, inode);
1848 return NULL;
1849
1850 out:
1851 return ERR_PTR(error);
1852 }
1853
1854 static struct dentry *proc_tgid_base_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd){
1855 return proc_pident_lookup(dir, dentry, tgid_base_stuff);
1856 }
1857
1858 static struct dentry *proc_tid_base_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd){
1859 return proc_pident_lookup(dir, dentry, tid_base_stuff);
1860 }
1861
1862 static struct file_operations proc_tgid_base_operations = {
1863 .read = generic_read_dir,
1864 .readdir = proc_tgid_base_readdir,
1865 };
1866
1867 static struct file_operations proc_tid_base_operations = {
1868 .read = generic_read_dir,
1869 .readdir = proc_tid_base_readdir,
1870 };
1871
1872 static struct inode_operations proc_tgid_base_inode_operations = {
1873 .lookup = proc_tgid_base_lookup,
1874 };
1875
1876 static struct inode_operations proc_tid_base_inode_operations = {
1877 .lookup = proc_tid_base_lookup,
1878 };
1879
1880 #ifdef CONFIG_SECURITY
1881 static int proc_tgid_attr_readdir(struct file * filp,
1882 void * dirent, filldir_t filldir)
1883 {
1884 return proc_pident_readdir(filp,dirent,filldir,
1885 tgid_attr_stuff,ARRAY_SIZE(tgid_attr_stuff));
1886 }
1887
1888 static int proc_tid_attr_readdir(struct file * filp,
1889 void * dirent, filldir_t filldir)
1890 {
1891 return proc_pident_readdir(filp,dirent,filldir,
1892 tid_attr_stuff,ARRAY_SIZE(tid_attr_stuff));
1893 }
1894
1895 static struct file_operations proc_tgid_attr_operations = {
1896 .read = generic_read_dir,
1897 .readdir = proc_tgid_attr_readdir,
1898 };
1899
1900 static struct file_operations proc_tid_attr_operations = {
1901 .read = generic_read_dir,
1902 .readdir = proc_tid_attr_readdir,
1903 };
1904
1905 static struct dentry *proc_tgid_attr_lookup(struct inode *dir,
1906 struct dentry *dentry, struct nameidata *nd)
1907 {
1908 return proc_pident_lookup(dir, dentry, tgid_attr_stuff);
1909 }
1910
1911 static struct dentry *proc_tid_attr_lookup(struct inode *dir,
1912 struct dentry *dentry, struct nameidata *nd)
1913 {
1914 return proc_pident_lookup(dir, dentry, tid_attr_stuff);
1915 }
1916
1917 static struct inode_operations proc_tgid_attr_inode_operations = {
1918 .lookup = proc_tgid_attr_lookup,
1919 };
1920
1921 static struct inode_operations proc_tid_attr_inode_operations = {
1922 .lookup = proc_tid_attr_lookup,
1923 };
1924 #endif
1925
1926 /*
1927 * /proc/self:
1928 */
1929 static int proc_self_readlink(struct dentry *dentry, char __user *buffer,
1930 int buflen)
1931 {
1932 char tmp[30];
1933 sprintf(tmp, "%d", current->tgid);
1934 return vfs_readlink(dentry,buffer,buflen,tmp);
1935 }
1936
1937 static void *proc_self_follow_link(struct dentry *dentry, struct nameidata *nd)
1938 {
1939 char tmp[30];
1940 sprintf(tmp, "%d", current->tgid);
1941 return ERR_PTR(vfs_follow_link(nd,tmp));
1942 }
1943
1944 static struct inode_operations proc_self_inode_operations = {
1945 .readlink = proc_self_readlink,
1946 .follow_link = proc_self_follow_link,
1947 };
1948
1949 /**
1950 * proc_pid_unhash - Unhash /proc/@pid entry from the dcache.
1951 * @p: task that should be flushed.
1952 *
1953 * Drops the /proc/@pid dcache entry from the hash chains.
1954 *
1955 * Dropping /proc/@pid entries and detach_pid must be synchroneous,
1956 * otherwise e.g. /proc/@pid/exe might point to the wrong executable,
1957 * if the pid value is immediately reused. This is enforced by
1958 * - caller must acquire spin_lock(p->proc_lock)
1959 * - must be called before detach_pid()
1960 * - proc_pid_lookup acquires proc_lock, and checks that
1961 * the target is not dead by looking at the attach count
1962 * of PIDTYPE_PID.
1963 */
1964
1965 struct dentry *proc_pid_unhash(struct task_struct *p)
1966 {
1967 struct dentry *proc_dentry;
1968
1969 proc_dentry = p->proc_dentry;
1970 if (proc_dentry != NULL) {
1971
1972 spin_lock(&dcache_lock);
1973 spin_lock(&proc_dentry->d_lock);
1974 if (!d_unhashed(proc_dentry)) {
1975 dget_locked(proc_dentry);
1976 __d_drop(proc_dentry);
1977 spin_unlock(&proc_dentry->d_lock);
1978 } else {
1979 spin_unlock(&proc_dentry->d_lock);
1980 proc_dentry = NULL;
1981 }
1982 spin_unlock(&dcache_lock);
1983 }
1984 return proc_dentry;
1985 }
1986
1987 /**
1988 * proc_pid_flush - recover memory used by stale /proc/@pid/x entries
1989 * @proc_dentry: directoy to prune.
1990 *
1991 * Shrink the /proc directory that was used by the just killed thread.
1992 */
1993
1994 void proc_pid_flush(struct dentry *proc_dentry)
1995 {
1996 might_sleep();
1997 if(proc_dentry != NULL) {
1998 shrink_dcache_parent(proc_dentry);
1999 dput(proc_dentry);
2000 }
2001 }
2002
2003 /* SMP-safe */
2004 struct dentry *proc_pid_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd)
2005 {
2006 struct task_struct *task;
2007 struct inode *inode;
2008 struct proc_inode *ei;
2009 unsigned tgid;
2010 int died;
2011
2012 if (dentry->d_name.len == 4 && !memcmp(dentry->d_name.name,"self",4)) {
2013 inode = new_inode(dir->i_sb);
2014 if (!inode)
2015 return ERR_PTR(-ENOMEM);
2016 ei = PROC_I(inode);
2017 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
2018 inode->i_ino = fake_ino(0, PROC_TGID_INO);
2019 ei->pde = NULL;
2020 inode->i_mode = S_IFLNK|S_IRWXUGO;
2021 inode->i_uid = inode->i_gid = 0;
2022 inode->i_size = 64;
2023 inode->i_op = &proc_self_inode_operations;
2024 d_add(dentry, inode);
2025 return NULL;
2026 }
2027 tgid = name_to_int(dentry);
2028 if (tgid == ~0U)
2029 goto out;
2030
2031 read_lock(&tasklist_lock);
2032 task = find_task_by_pid(tgid);
2033 if (task)
2034 get_task_struct(task);
2035 read_unlock(&tasklist_lock);
2036 if (!task)
2037 goto out;
2038
2039 inode = proc_pid_make_inode(dir->i_sb, task, PROC_TGID_INO);
2040
2041
2042 if (!inode) {
2043 put_task_struct(task);
2044 goto out;
2045 }
2046 inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO;
2047 inode->i_op = &proc_tgid_base_inode_operations;
2048 inode->i_fop = &proc_tgid_base_operations;
2049 inode->i_flags|=S_IMMUTABLE;
2050 #ifdef CONFIG_SECURITY
2051 inode->i_nlink = 5;
2052 #else
2053 inode->i_nlink = 4;
2054 #endif
2055
2056 dentry->d_op = &pid_base_dentry_operations;
2057
2058 died = 0;
2059 d_add(dentry, inode);
2060 spin_lock(&task->proc_lock);
2061 task->proc_dentry = dentry;
2062 if (!pid_alive(task)) {
2063 dentry = proc_pid_unhash(task);
2064 died = 1;
2065 }
2066 spin_unlock(&task->proc_lock);
2067
2068 put_task_struct(task);
2069 if (died) {
2070 proc_pid_flush(dentry);
2071 goto out;
2072 }
2073 return NULL;
2074 out:
2075 return ERR_PTR(-ENOENT);
2076 }
2077
2078 /* SMP-safe */
2079 static struct dentry *proc_task_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd)
2080 {
2081 struct task_struct *task;
2082 struct task_struct *leader = proc_task(dir);
2083 struct inode *inode;
2084 unsigned tid;
2085
2086 tid = name_to_int(dentry);
2087 if (tid == ~0U)
2088 goto out;
2089
2090 read_lock(&tasklist_lock);
2091 task = find_task_by_pid(tid);
2092 if (task)
2093 get_task_struct(task);
2094 read_unlock(&tasklist_lock);
2095 if (!task)
2096 goto out;
2097 if (leader->tgid != task->tgid)
2098 goto out_drop_task;
2099
2100 inode = proc_pid_make_inode(dir->i_sb, task, PROC_TID_INO);
2101
2102
2103 if (!inode)
2104 goto out_drop_task;
2105 inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO;
2106 inode->i_op = &proc_tid_base_inode_operations;
2107 inode->i_fop = &proc_tid_base_operations;
2108 inode->i_flags|=S_IMMUTABLE;
2109 #ifdef CONFIG_SECURITY
2110 inode->i_nlink = 4;
2111 #else
2112 inode->i_nlink = 3;
2113 #endif
2114
2115 dentry->d_op = &pid_base_dentry_operations;
2116
2117 d_add(dentry, inode);
2118
2119 put_task_struct(task);
2120 return NULL;
2121 out_drop_task:
2122 put_task_struct(task);
2123 out:
2124 return ERR_PTR(-ENOENT);
2125 }
2126
2127 #define PROC_NUMBUF 10
2128 #define PROC_MAXPIDS 20
2129
2130 /*
2131 * Get a few tgid's to return for filldir - we need to hold the
2132 * tasklist lock while doing this, and we must release it before
2133 * we actually do the filldir itself, so we use a temp buffer..
2134 */
2135 static int get_tgid_list(int index, unsigned long version, unsigned int *tgids)
2136 {
2137 struct task_struct *p;
2138 int nr_tgids = 0;
2139
2140 index--;
2141 read_lock(&tasklist_lock);
2142 p = NULL;
2143 if (version) {
2144 p = find_task_by_pid(version);
2145 if (p && !thread_group_leader(p))
2146 p = NULL;
2147 }
2148
2149 if (p)
2150 index = 0;
2151 else
2152 p = next_task(&init_task);
2153
2154 for ( ; p != &init_task; p = next_task(p)) {
2155 int tgid = p->pid;
2156 if (!pid_alive(p))
2157 continue;
2158 if (--index >= 0)
2159 continue;
2160 tgids[nr_tgids] = tgid;
2161 nr_tgids++;
2162 if (nr_tgids >= PROC_MAXPIDS)
2163 break;
2164 }
2165 read_unlock(&tasklist_lock);
2166 return nr_tgids;
2167 }
2168
2169 /*
2170 * Get a few tid's to return for filldir - we need to hold the
2171 * tasklist lock while doing this, and we must release it before
2172 * we actually do the filldir itself, so we use a temp buffer..
2173 */
2174 static int get_tid_list(int index, unsigned int *tids, struct inode *dir)
2175 {
2176 struct task_struct *leader_task = proc_task(dir);
2177 struct task_struct *task = leader_task;
2178 int nr_tids = 0;
2179
2180 index -= 2;
2181 read_lock(&tasklist_lock);
2182 /*
2183 * The starting point task (leader_task) might be an already
2184 * unlinked task, which cannot be used to access the task-list
2185 * via next_thread().
2186 */
2187 if (pid_alive(task)) do {
2188 int tid = task->pid;
2189
2190 if (--index >= 0)
2191 continue;
2192 if (tids != NULL)
2193 tids[nr_tids] = tid;
2194 nr_tids++;
2195 if (nr_tids >= PROC_MAXPIDS)
2196 break;
2197 } while ((task = next_thread(task)) != leader_task);
2198 read_unlock(&tasklist_lock);
2199 return nr_tids;
2200 }
2201
2202 /* for the /proc/ directory itself, after non-process stuff has been done */
2203 int proc_pid_readdir(struct file * filp, void * dirent, filldir_t filldir)
2204 {
2205 unsigned int tgid_array[PROC_MAXPIDS];
2206 char buf[PROC_NUMBUF];
2207 unsigned int nr = filp->f_pos - FIRST_PROCESS_ENTRY;
2208 unsigned int nr_tgids, i;
2209 int next_tgid;
2210
2211 if (!nr) {
2212 ino_t ino = fake_ino(0,PROC_TGID_INO);
2213 if (filldir(dirent, "self", 4, filp->f_pos, ino, DT_LNK) < 0)
2214 return 0;
2215 filp->f_pos++;
2216 nr++;
2217 }
2218
2219 /* f_version caches the tgid value that the last readdir call couldn't
2220 * return. lseek aka telldir automagically resets f_version to 0.
2221 */
2222 next_tgid = filp->f_version;
2223 filp->f_version = 0;
2224 for (;;) {
2225 nr_tgids = get_tgid_list(nr, next_tgid, tgid_array);
2226 if (!nr_tgids) {
2227 /* no more entries ! */
2228 break;
2229 }
2230 next_tgid = 0;
2231
2232 /* do not use the last found pid, reserve it for next_tgid */
2233 if (nr_tgids == PROC_MAXPIDS) {
2234 nr_tgids--;
2235 next_tgid = tgid_array[nr_tgids];
2236 }
2237
2238 for (i=0;i<nr_tgids;i++) {
2239 int tgid = tgid_array[i];
2240 ino_t ino = fake_ino(tgid,PROC_TGID_INO);
2241 unsigned long j = PROC_NUMBUF;
2242
2243 do
2244 buf[--j] = '0' + (tgid % 10);
2245 while ((tgid /= 10) != 0);
2246
2247 if (filldir(dirent, buf+j, PROC_NUMBUF-j, filp->f_pos, ino, DT_DIR) < 0) {
2248 /* returning this tgid failed, save it as the first
2249 * pid for the next readir call */
2250 filp->f_version = tgid_array[i];
2251 goto out;
2252 }
2253 filp->f_pos++;
2254 nr++;
2255 }
2256 }
2257 out:
2258 return 0;
2259 }
2260
2261 /* for the /proc/TGID/task/ directories */
2262 static int proc_task_readdir(struct file * filp, void * dirent, filldir_t filldir)
2263 {
2264 unsigned int tid_array[PROC_MAXPIDS];
2265 char buf[PROC_NUMBUF];
2266 unsigned int nr_tids, i;
2267 struct dentry *dentry = filp->f_dentry;
2268 struct inode *inode = dentry->d_inode;
2269 int retval = -ENOENT;
2270 ino_t ino;
2271 unsigned long pos = filp->f_pos; /* avoiding "long long" filp->f_pos */
2272
2273 if (!pid_alive(proc_task(inode)))
2274 goto out;
2275 retval = 0;
2276
2277 switch (pos) {
2278 case 0:
2279 ino = inode->i_ino;
2280 if (filldir(dirent, ".", 1, pos, ino, DT_DIR) < 0)
2281 goto out;
2282 pos++;
2283 /* fall through */
2284 case 1:
2285 ino = parent_ino(dentry);
2286 if (filldir(dirent, "..", 2, pos, ino, DT_DIR) < 0)
2287 goto out;
2288 pos++;
2289 /* fall through */
2290 }
2291
2292 nr_tids = get_tid_list(pos, tid_array, inode);
2293 inode->i_nlink = pos + nr_tids;
2294
2295 for (i = 0; i < nr_tids; i++) {
2296 unsigned long j = PROC_NUMBUF;
2297 int tid = tid_array[i];
2298
2299 ino = fake_ino(tid,PROC_TID_INO);
2300
2301 do
2302 buf[--j] = '0' + (tid % 10);
2303 while ((tid /= 10) != 0);
2304
2305 if (filldir(dirent, buf+j, PROC_NUMBUF-j, pos, ino, DT_DIR) < 0)
2306 break;
2307 pos++;
2308 }
2309 out:
2310 filp->f_pos = pos;
2311 return retval;
2312 }
SocketAccessConTroL development