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[PATCH] fix enum pid_directory_inos in proc/base.c
[deliverable/linux.git] / fs / proc / base.c
CommitLineData
1da177e4
LT		 1/*
2 * linux/fs/proc/base.c
3 *
4 * Copyright (C) 1991, 1992 Linus Torvalds
5 *
6 * proc base directory handling functions
7 *
8 * 1999, Al Viro. Rewritten. Now it covers the whole per-process part.
9 * Instead of using magical inumbers to determine the kind of object
10 * we allocate and fill in-core inodes upon lookup. They don't even
11 * go into icache. We cache the reference to task_struct upon lookup too.
12 * Eventually it should become a filesystem in its own. We don't use the
13 * rest of procfs anymore.
e070ad49
ML		 14 *
15 *
16 * Changelog:
17 * 17-Jan-2005
18 * Allan Bezerra
19 * Bruna Moreira <bruna.moreira@indt.org.br>
20 * Edjard Mota <edjard.mota@indt.org.br>
21 * Ilias Biris <ilias.biris@indt.org.br>
22 * Mauricio Lin <mauricio.lin@indt.org.br>
23 *
24 * Embedded Linux Lab - 10LE Instituto Nokia de Tecnologia - INdT
25 *
26 * A new process specific entry (smaps) included in /proc. It shows the
27 * size of rss for each memory area. The maps entry lacks information
28 * about physical memory size (rss) for each mapped file, i.e.,
29 * rss information for executables and library files.
30 * This additional information is useful for any tools that need to know
31 * about physical memory consumption for a process specific library.
32 *
33 * Changelog:
34 * 21-Feb-2005
35 * Embedded Linux Lab - 10LE Instituto Nokia de Tecnologia - INdT
36 * Pud inclusion in the page table walking.
37 *
38 * ChangeLog:
39 * 10-Mar-2005
40 * 10LE Instituto Nokia de Tecnologia - INdT:
41 * A better way to walks through the page table as suggested by Hugh Dickins.
42 *
43 * Simo Piiroinen <simo.piiroinen@nokia.com>:
44 * Smaps information related to shared, private, clean and dirty pages.
45 *
46 * Paul Mundt <paul.mundt@nokia.com>:
47 * Overall revision about smaps.
1da177e4
LT		 48 */
49
50#include <asm/uaccess.h>
51
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>
65#include <linux/kallsyms.h>
66#include <linux/mount.h>
67#include <linux/security.h>
68#include <linux/ptrace.h>
69#include <linux/seccomp.h>
70#include <linux/cpuset.h>
71#include <linux/audit.h>
72#include "internal.h"
73
74/*
75 * For hysterical raisins we keep the same inumbers as in the old procfs.
76 * Feel free to change the macro below - just keep the range distinct from
77 * inumbers of the rest of procfs (currently those are in 0x0000--0xffff).
78 * As soon as we'll get a separate superblock we will be able to forget
79 * about magical ranges too.
80 */
81
82#define fake_ino(pid,ino) (((pid)<<16)|(ino))
83
84enum pid_directory_inos {
85 PROC_TGID_INO = 2,
86 PROC_TGID_TASK,
87 PROC_TGID_STATUS,
88 PROC_TGID_MEM,
89#ifdef CONFIG_SECCOMP
90 PROC_TGID_SECCOMP,
91#endif
92 PROC_TGID_CWD,
93 PROC_TGID_ROOT,
94 PROC_TGID_EXE,
95 PROC_TGID_FD,
96 PROC_TGID_ENVIRON,
97 PROC_TGID_AUXV,
98 PROC_TGID_CMDLINE,
99 PROC_TGID_STAT,
100 PROC_TGID_STATM,
101 PROC_TGID_MAPS,
6e21c8f1 102 PROC_TGID_NUMA_MAPS,
1da177e4
LT		 103 PROC_TGID_MOUNTS,
104 PROC_TGID_WCHAN,
e070ad49 105 PROC_TGID_SMAPS,
1da177e4
LT		 106#ifdef CONFIG_SCHEDSTATS
107 PROC_TGID_SCHEDSTAT,
108#endif
109#ifdef CONFIG_CPUSETS
110 PROC_TGID_CPUSET,
111#endif
112#ifdef CONFIG_SECURITY
113 PROC_TGID_ATTR,
114 PROC_TGID_ATTR_CURRENT,
115 PROC_TGID_ATTR_PREV,
116 PROC_TGID_ATTR_EXEC,
117 PROC_TGID_ATTR_FSCREATE,
118#endif
119#ifdef CONFIG_AUDITSYSCALL
120 PROC_TGID_LOGINUID,
121#endif
1da177e4
LT		 122 PROC_TGID_OOM_SCORE,
123 PROC_TGID_OOM_ADJUST,
124 PROC_TID_INO,
125 PROC_TID_STATUS,
126 PROC_TID_MEM,
127#ifdef CONFIG_SECCOMP
128 PROC_TID_SECCOMP,
129#endif
130 PROC_TID_CWD,
131 PROC_TID_ROOT,
132 PROC_TID_EXE,
133 PROC_TID_FD,
134 PROC_TID_ENVIRON,
135 PROC_TID_AUXV,
136 PROC_TID_CMDLINE,
137 PROC_TID_STAT,
138 PROC_TID_STATM,
139 PROC_TID_MAPS,
6e21c8f1 140 PROC_TID_NUMA_MAPS,
1da177e4
LT		 141 PROC_TID_MOUNTS,
142 PROC_TID_WCHAN,
e070ad49 143 PROC_TID_SMAPS,
1da177e4
LT		 144#ifdef CONFIG_SCHEDSTATS
145 PROC_TID_SCHEDSTAT,
146#endif
147#ifdef CONFIG_CPUSETS
148 PROC_TID_CPUSET,
149#endif
150#ifdef CONFIG_SECURITY
151 PROC_TID_ATTR,
152 PROC_TID_ATTR_CURRENT,
153 PROC_TID_ATTR_PREV,
154 PROC_TID_ATTR_EXEC,
155 PROC_TID_ATTR_FSCREATE,
156#endif
157#ifdef CONFIG_AUDITSYSCALL
158 PROC_TID_LOGINUID,
159#endif
1da177e4
LT		 160 PROC_TID_OOM_SCORE,
161 PROC_TID_OOM_ADJUST,
5e21ccb1
MS		 162
163 /* Add new entries before this */
164 PROC_TID_FD_DIR = 0x8000, /* 0x8000-0xffff */
1da177e4
LT		 165};
166
167struct pid_entry {
168 int type;
169 int len;
170 char *name;
171 mode_t mode;
172};
173
174#define E(type,name,mode) {(type),sizeof(name)-1,(name),(mode)}
175
176static struct pid_entry tgid_base_stuff[] = {
177 E(PROC_TGID_TASK, "task", S_IFDIR|S_IRUGO|S_IXUGO),
178 E(PROC_TGID_FD, "fd", S_IFDIR|S_IRUSR|S_IXUSR),
179 E(PROC_TGID_ENVIRON, "environ", S_IFREG|S_IRUSR),
180 E(PROC_TGID_AUXV, "auxv", S_IFREG|S_IRUSR),
181 E(PROC_TGID_STATUS, "status", S_IFREG|S_IRUGO),
182 E(PROC_TGID_CMDLINE, "cmdline", S_IFREG|S_IRUGO),
183 E(PROC_TGID_STAT, "stat", S_IFREG|S_IRUGO),
184 E(PROC_TGID_STATM, "statm", S_IFREG|S_IRUGO),
185 E(PROC_TGID_MAPS, "maps", S_IFREG|S_IRUGO),
6e21c8f1
CL		 186#ifdef CONFIG_NUMA
187 E(PROC_TGID_NUMA_MAPS, "numa_maps", S_IFREG|S_IRUGO),
188#endif
1da177e4
LT		 189 E(PROC_TGID_MEM, "mem", S_IFREG|S_IRUSR|S_IWUSR),
190#ifdef CONFIG_SECCOMP
191 E(PROC_TGID_SECCOMP, "seccomp", S_IFREG|S_IRUSR|S_IWUSR),
192#endif
193 E(PROC_TGID_CWD, "cwd", S_IFLNK|S_IRWXUGO),
194 E(PROC_TGID_ROOT, "root", S_IFLNK|S_IRWXUGO),
195 E(PROC_TGID_EXE, "exe", S_IFLNK|S_IRWXUGO),
196 E(PROC_TGID_MOUNTS, "mounts", S_IFREG|S_IRUGO),
e070ad49 197 E(PROC_TGID_SMAPS, "smaps", S_IFREG|S_IRUGO),
1da177e4
LT		 198#ifdef CONFIG_SECURITY
199 E(PROC_TGID_ATTR, "attr", S_IFDIR|S_IRUGO|S_IXUGO),
200#endif
201#ifdef CONFIG_KALLSYMS
202 E(PROC_TGID_WCHAN, "wchan", S_IFREG|S_IRUGO),
203#endif
204#ifdef CONFIG_SCHEDSTATS
205 E(PROC_TGID_SCHEDSTAT, "schedstat", S_IFREG|S_IRUGO),
206#endif
207#ifdef CONFIG_CPUSETS
208 E(PROC_TGID_CPUSET, "cpuset", S_IFREG|S_IRUGO),
209#endif
210 E(PROC_TGID_OOM_SCORE, "oom_score",S_IFREG|S_IRUGO),
211 E(PROC_TGID_OOM_ADJUST,"oom_adj", S_IFREG|S_IRUGO|S_IWUSR),
212#ifdef CONFIG_AUDITSYSCALL
213 E(PROC_TGID_LOGINUID, "loginuid", S_IFREG|S_IWUSR|S_IRUGO),
214#endif
215 {0,0,NULL,0}
216};
217static struct pid_entry tid_base_stuff[] = {
218 E(PROC_TID_FD, "fd", S_IFDIR|S_IRUSR|S_IXUSR),
219 E(PROC_TID_ENVIRON, "environ", S_IFREG|S_IRUSR),
220 E(PROC_TID_AUXV, "auxv", S_IFREG|S_IRUSR),
221 E(PROC_TID_STATUS, "status", S_IFREG|S_IRUGO),
222 E(PROC_TID_CMDLINE, "cmdline", S_IFREG|S_IRUGO),
223 E(PROC_TID_STAT, "stat", S_IFREG|S_IRUGO),
224 E(PROC_TID_STATM, "statm", S_IFREG|S_IRUGO),
225 E(PROC_TID_MAPS, "maps", S_IFREG|S_IRUGO),
6e21c8f1
CL		 226#ifdef CONFIG_NUMA
227 E(PROC_TID_NUMA_MAPS, "numa_maps", S_IFREG|S_IRUGO),
228#endif
1da177e4
LT		 229 E(PROC_TID_MEM, "mem", S_IFREG|S_IRUSR|S_IWUSR),
230#ifdef CONFIG_SECCOMP
231 E(PROC_TID_SECCOMP, "seccomp", S_IFREG|S_IRUSR|S_IWUSR),
232#endif
233 E(PROC_TID_CWD, "cwd", S_IFLNK|S_IRWXUGO),
234 E(PROC_TID_ROOT, "root", S_IFLNK|S_IRWXUGO),
235 E(PROC_TID_EXE, "exe", S_IFLNK|S_IRWXUGO),
236 E(PROC_TID_MOUNTS, "mounts", S_IFREG|S_IRUGO),
e070ad49 237 E(PROC_TID_SMAPS, "smaps", S_IFREG|S_IRUGO),
1da177e4
LT		 238#ifdef CONFIG_SECURITY
239 E(PROC_TID_ATTR, "attr", S_IFDIR|S_IRUGO|S_IXUGO),
240#endif
241#ifdef CONFIG_KALLSYMS
242 E(PROC_TID_WCHAN, "wchan", S_IFREG|S_IRUGO),
243#endif
244#ifdef CONFIG_SCHEDSTATS
245 E(PROC_TID_SCHEDSTAT, "schedstat",S_IFREG|S_IRUGO),
246#endif
247#ifdef CONFIG_CPUSETS
248 E(PROC_TID_CPUSET, "cpuset", S_IFREG|S_IRUGO),
249#endif
250 E(PROC_TID_OOM_SCORE, "oom_score",S_IFREG|S_IRUGO),
251 E(PROC_TID_OOM_ADJUST, "oom_adj", S_IFREG|S_IRUGO|S_IWUSR),
252#ifdef CONFIG_AUDITSYSCALL
253 E(PROC_TID_LOGINUID, "loginuid", S_IFREG|S_IWUSR|S_IRUGO),
254#endif
255 {0,0,NULL,0}
256};
257
258#ifdef CONFIG_SECURITY
259static struct pid_entry tgid_attr_stuff[] = {
260 E(PROC_TGID_ATTR_CURRENT, "current", S_IFREG|S_IRUGO|S_IWUGO),
261 E(PROC_TGID_ATTR_PREV, "prev", S_IFREG|S_IRUGO),
262 E(PROC_TGID_ATTR_EXEC, "exec", S_IFREG|S_IRUGO|S_IWUGO),
263 E(PROC_TGID_ATTR_FSCREATE, "fscreate", S_IFREG|S_IRUGO|S_IWUGO),
264 {0,0,NULL,0}
265};
266static struct pid_entry tid_attr_stuff[] = {
267 E(PROC_TID_ATTR_CURRENT, "current", S_IFREG|S_IRUGO|S_IWUGO),
268 E(PROC_TID_ATTR_PREV, "prev", S_IFREG|S_IRUGO),
269 E(PROC_TID_ATTR_EXEC, "exec", S_IFREG|S_IRUGO|S_IWUGO),
270 E(PROC_TID_ATTR_FSCREATE, "fscreate", S_IFREG|S_IRUGO|S_IWUGO),
271 {0,0,NULL,0}
272};
273#endif
274
275#undef E
276
277static int proc_fd_link(struct inode *inode, struct dentry **dentry, struct vfsmount **mnt)
278{
279 struct task_struct *task = proc_task(inode);
280 struct files_struct *files;
281 struct file *file;
282 int fd = proc_type(inode) - PROC_TID_FD_DIR;
283
284 files = get_files_struct(task);
285 if (files) {
286 spin_lock(&files->file_lock);
287 file = fcheck_files(files, fd);
288 if (file) {
289 *mnt = mntget(file->f_vfsmnt);
290 *dentry = dget(file->f_dentry);
291 spin_unlock(&files->file_lock);
292 put_files_struct(files);
293 return 0;
294 }
295 spin_unlock(&files->file_lock);
296 put_files_struct(files);
297 }
298 return -ENOENT;
299}
300
0494f6ec 301static struct fs_struct *get_fs_struct(struct task_struct *task)
1da177e4
LT		 302{
303 struct fs_struct *fs;
0494f6ec
MS		 304 task_lock(task);
305 fs = task->fs;
1da177e4
LT		 306 if(fs)
307 atomic_inc(&fs->count);
0494f6ec
MS		 308 task_unlock(task);
309 return fs;
310}
311
312static int proc_cwd_link(struct inode *inode, struct dentry **dentry, struct vfsmount **mnt)
313{
314 struct fs_struct *fs = get_fs_struct(proc_task(inode));
315 int result = -ENOENT;
1da177e4
LT		 316 if (fs) {
317 read_lock(&fs->lock);
318 *mnt = mntget(fs->pwdmnt);
319 *dentry = dget(fs->pwd);
320 read_unlock(&fs->lock);
321 result = 0;
322 put_fs_struct(fs);
323 }
324 return result;
325}
326
327static int proc_root_link(struct inode *inode, struct dentry **dentry, struct vfsmount **mnt)
328{
0494f6ec 329 struct fs_struct *fs = get_fs_struct(proc_task(inode));
1da177e4 330 int result = -ENOENT;
1da177e4
LT		 331 if (fs) {
332 read_lock(&fs->lock);
333 *mnt = mntget(fs->rootmnt);
334 *dentry = dget(fs->root);
335 read_unlock(&fs->lock);
336 result = 0;
337 put_fs_struct(fs);
338 }
339 return result;
340}
341
342#define MAY_PTRACE(task) \
343 (task == current || \
344 (task->parent == current && \
345 (task->ptrace & PT_PTRACED) && \
346 (task->state == TASK_STOPPED || task->state == TASK_TRACED) && \
347 security_ptrace(current,task) == 0))
348
349static int may_ptrace_attach(struct task_struct *task)
350{
351 int retval = 0;
352
353 task_lock(task);
354
355 if (!task->mm)
356 goto out;
357 if (((current->uid != task->euid) ||
358 (current->uid != task->suid) ||
359 (current->uid != task->uid) ||
360 (current->gid != task->egid) ||
361 (current->gid != task->sgid) ||
362 (current->gid != task->gid)) && !capable(CAP_SYS_PTRACE))
363 goto out;
364 rmb();
d6e71144 365 if (task->mm->dumpable != 1 && !capable(CAP_SYS_PTRACE))
1da177e4
LT		 366 goto out;
367 if (security_ptrace(current, task))
368 goto out;
369
370 retval = 1;
371out:
372 task_unlock(task);
373 return retval;
374}
375
376static int proc_pid_environ(struct task_struct *task, char * buffer)
377{
378 int res = 0;
379 struct mm_struct *mm = get_task_mm(task);
380 if (mm) {
381 unsigned int len = mm->env_end - mm->env_start;
382 if (len > PAGE_SIZE)
383 len = PAGE_SIZE;
384 res = access_process_vm(task, mm->env_start, buffer, len, 0);
385 if (!may_ptrace_attach(task))
386 res = -ESRCH;
387 mmput(mm);
388 }
389 return res;
390}
391
392static int proc_pid_cmdline(struct task_struct *task, char * buffer)
393{
394 int res = 0;
395 unsigned int len;
396 struct mm_struct *mm = get_task_mm(task);
397 if (!mm)
398 goto out;
399 if (!mm->arg_end)
400 goto out_mm; /* Shh! No looking before we're done */
401
402 len = mm->arg_end - mm->arg_start;
403
404 if (len > PAGE_SIZE)
405 len = PAGE_SIZE;
406
407 res = access_process_vm(task, mm->arg_start, buffer, len, 0);
408
409 // If the nul at the end of args has been overwritten, then
410 // assume application is using setproctitle(3).
411 if (res > 0 && buffer[res-1] != '\0' && len < PAGE_SIZE) {
412 len = strnlen(buffer, res);
413 if (len < res) {
414 res = len;
415 } else {
416 len = mm->env_end - mm->env_start;
417 if (len > PAGE_SIZE - res)
418 len = PAGE_SIZE - res;
419 res += access_process_vm(task, mm->env_start, buffer+res, len, 0);
420 res = strnlen(buffer, res);
421 }
422 }
423out_mm:
424 mmput(mm);
425out:
426 return res;
427}
428
429static int proc_pid_auxv(struct task_struct *task, char *buffer)
430{
431 int res = 0;
432 struct mm_struct *mm = get_task_mm(task);
433 if (mm) {
434 unsigned int nwords = 0;
435 do
436 nwords += 2;
437 while (mm->saved_auxv[nwords - 2] != 0); /* AT_NULL */
438 res = nwords * sizeof(mm->saved_auxv[0]);
439 if (res > PAGE_SIZE)
440 res = PAGE_SIZE;
441 memcpy(buffer, mm->saved_auxv, res);
442 mmput(mm);
443 }
444 return res;
445}
446
447
448#ifdef CONFIG_KALLSYMS
449/*
450 * Provides a wchan file via kallsyms in a proper one-value-per-file format.
451 * Returns the resolved symbol. If that fails, simply return the address.
452 */
453static int proc_pid_wchan(struct task_struct *task, char *buffer)
454{
455 char *modname;
456 const char *sym_name;
457 unsigned long wchan, size, offset;
458 char namebuf[KSYM_NAME_LEN+1];
459
460 wchan = get_wchan(task);
461
462 sym_name = kallsyms_lookup(wchan, &size, &offset, &modname, namebuf);
463 if (sym_name)
464 return sprintf(buffer, "%s", sym_name);
465 return sprintf(buffer, "%lu", wchan);
466}
467#endif /* CONFIG_KALLSYMS */
468
469#ifdef CONFIG_SCHEDSTATS
470/*
471 * Provides /proc/PID/schedstat
472 */
473static int proc_pid_schedstat(struct task_struct *task, char *buffer)
474{
475 return sprintf(buffer, "%lu %lu %lu\n",
476 task->sched_info.cpu_time,
477 task->sched_info.run_delay,
478 task->sched_info.pcnt);
479}
480#endif
481
482/* The badness from the OOM killer */
483unsigned long badness(struct task_struct *p, unsigned long uptime);
484static int proc_oom_score(struct task_struct *task, char *buffer)
485{
486 unsigned long points;
487 struct timespec uptime;
488
489 do_posix_clock_monotonic_gettime(&uptime);
490 points = badness(task, uptime.tv_sec);
491 return sprintf(buffer, "%lu\n", points);
492}
493
494/************************************************************************/
495/* Here the fs part begins */
496/************************************************************************/
497
498/* permission checks */
499
500static int proc_check_root(struct inode *inode)
501{
502 struct dentry *de, *base, *root;
503 struct vfsmount *our_vfsmnt, *vfsmnt, *mnt;
504 int res = 0;
505
506 if (proc_root_link(inode, &root, &vfsmnt)) /* Ewww... */
507 return -ENOENT;
508 read_lock(&current->fs->lock);
509 our_vfsmnt = mntget(current->fs->rootmnt);
510 base = dget(current->fs->root);
511 read_unlock(&current->fs->lock);
512
513 spin_lock(&vfsmount_lock);
514 de = root;
515 mnt = vfsmnt;
516
517 while (vfsmnt != our_vfsmnt) {
518 if (vfsmnt == vfsmnt->mnt_parent)
519 goto out;
520 de = vfsmnt->mnt_mountpoint;
521 vfsmnt = vfsmnt->mnt_parent;
522 }
523
524 if (!is_subdir(de, base))
525 goto out;
526 spin_unlock(&vfsmount_lock);
527
528exit:
529 dput(base);
530 mntput(our_vfsmnt);
531 dput(root);
532 mntput(mnt);
533 return res;
534out:
535 spin_unlock(&vfsmount_lock);
536 res = -EACCES;
537 goto exit;
538}
539
540static int proc_permission(struct inode *inode, int mask, struct nameidata *nd)
541{
542 if (generic_permission(inode, mask, NULL) != 0)
543 return -EACCES;
544 return proc_check_root(inode);
545}
546
547extern struct seq_operations proc_pid_maps_op;
548static int maps_open(struct inode *inode, struct file *file)
549{
550 struct task_struct *task = proc_task(inode);
551 int ret = seq_open(file, &proc_pid_maps_op);
552 if (!ret) {
553 struct seq_file *m = file->private_data;
554 m->private = task;
555 }
556 return ret;
557}
558
559static struct file_operations proc_maps_operations = {
560 .open = maps_open,
561 .read = seq_read,
562 .llseek = seq_lseek,
563 .release = seq_release,
564};
565
6e21c8f1
CL		 566#ifdef CONFIG_NUMA
567extern struct seq_operations proc_pid_numa_maps_op;
568static int numa_maps_open(struct inode *inode, struct file *file)
569{
570 struct task_struct *task = proc_task(inode);
571 int ret = seq_open(file, &proc_pid_numa_maps_op);
572 if (!ret) {
573 struct seq_file *m = file->private_data;
574 m->private = task;
575 }
576 return ret;
577}
578
579static struct file_operations proc_numa_maps_operations = {
580 .open = numa_maps_open,
581 .read = seq_read,
582 .llseek = seq_lseek,
583 .release = seq_release,
584};
585#endif
586
e070ad49
ML		 587extern struct seq_operations proc_pid_smaps_op;
588static int smaps_open(struct inode *inode, struct file *file)
589{
590 struct task_struct *task = proc_task(inode);
591 int ret = seq_open(file, &proc_pid_smaps_op);
592 if (!ret) {
593 struct seq_file *m = file->private_data;
594 m->private = task;
595 }
596 return ret;
597}
598
599static struct file_operations proc_smaps_operations = {
600 .open = smaps_open,
601 .read = seq_read,
602 .llseek = seq_lseek,
603 .release = seq_release,
604};
605
1da177e4
LT		 606extern struct seq_operations mounts_op;
607static int mounts_open(struct inode *inode, struct file *file)
608{
609 struct task_struct *task = proc_task(inode);
610 int ret = seq_open(file, &mounts_op);
611
612 if (!ret) {
613 struct seq_file *m = file->private_data;
614 struct namespace *namespace;
615 task_lock(task);
616 namespace = task->namespace;
617 if (namespace)
618 get_namespace(namespace);
619 task_unlock(task);
620
621 if (namespace)
622 m->private = namespace;
623 else {
624 seq_release(inode, file);
625 ret = -EINVAL;
626 }
627 }
628 return ret;
629}
630
631static int mounts_release(struct inode *inode, struct file *file)
632{
633 struct seq_file *m = file->private_data;
634 struct namespace *namespace = m->private;
635 put_namespace(namespace);
636 return seq_release(inode, file);
637}
638
639static struct file_operations proc_mounts_operations = {
640 .open = mounts_open,
641 .read = seq_read,
642 .llseek = seq_lseek,
643 .release = mounts_release,
644};
645
646#define PROC_BLOCK_SIZE (3*1024) /* 4K page size but our output routines use some slack for overruns */
647
648static ssize_t proc_info_read(struct file * file, char __user * buf,
649 size_t count, loff_t *ppos)
650{
651 struct inode * inode = file->f_dentry->d_inode;
652 unsigned long page;
653 ssize_t length;
654 struct task_struct *task = proc_task(inode);
655
656 if (count > PROC_BLOCK_SIZE)
657 count = PROC_BLOCK_SIZE;
658 if (!(page = __get_free_page(GFP_KERNEL)))
659 return -ENOMEM;
660
661 length = PROC_I(inode)->op.proc_read(task, (char*)page);
662
663 if (length >= 0)
664 length = simple_read_from_buffer(buf, count, ppos, (char *)page, length);
665 free_page(page);
666 return length;
667}
668
669static struct file_operations proc_info_file_operations = {
670 .read = proc_info_read,
671};
672
673static int mem_open(struct inode* inode, struct file* file)
674{
675 file->private_data = (void*)((long)current->self_exec_id);
676 return 0;
677}
678
679static ssize_t mem_read(struct file * file, char __user * buf,
680 size_t count, loff_t *ppos)
681{
682 struct task_struct *task = proc_task(file->f_dentry->d_inode);
683 char *page;
684 unsigned long src = *ppos;
685 int ret = -ESRCH;
686 struct mm_struct *mm;
687
688 if (!MAY_PTRACE(task) || !may_ptrace_attach(task))
689 goto out;
690
691 ret = -ENOMEM;
692 page = (char *)__get_free_page(GFP_USER);
693 if (!page)
694 goto out;
695
696 ret = 0;
697
698 mm = get_task_mm(task);
699 if (!mm)
700 goto out_free;
701
702 ret = -EIO;
703
704 if (file->private_data != (void*)((long)current->self_exec_id))
705 goto out_put;
706
707 ret = 0;
708
709 while (count > 0) {
710 int this_len, retval;
711
712 this_len = (count > PAGE_SIZE) ? PAGE_SIZE : count;
713 retval = access_process_vm(task, src, page, this_len, 0);
714 if (!retval || !MAY_PTRACE(task) || !may_ptrace_attach(task)) {
715 if (!ret)
716 ret = -EIO;
717 break;
718 }
719
720 if (copy_to_user(buf, page, retval)) {
721 ret = -EFAULT;
722 break;
723 }
724
725 ret += retval;
726 src += retval;
727 buf += retval;
728 count -= retval;
729 }
730 *ppos = src;
731
732out_put:
733 mmput(mm);
734out_free:
735 free_page((unsigned long) page);
736out:
737 return ret;
738}
739
740#define mem_write NULL
741
742#ifndef mem_write
743/* This is a security hazard */
744static ssize_t mem_write(struct file * file, const char * buf,
745 size_t count, loff_t *ppos)
746{
747 int copied = 0;
748 char *page;
749 struct task_struct *task = proc_task(file->f_dentry->d_inode);
750 unsigned long dst = *ppos;
751
752 if (!MAY_PTRACE(task) || !may_ptrace_attach(task))
753 return -ESRCH;
754
755 page = (char *)__get_free_page(GFP_USER);
756 if (!page)
757 return -ENOMEM;
758
759 while (count > 0) {
760 int this_len, retval;
761
762 this_len = (count > PAGE_SIZE) ? PAGE_SIZE : count;
763 if (copy_from_user(page, buf, this_len)) {
764 copied = -EFAULT;
765 break;
766 }
767 retval = access_process_vm(task, dst, page, this_len, 1);
768 if (!retval) {
769 if (!copied)
770 copied = -EIO;
771 break;
772 }
773 copied += retval;
774 buf += retval;
775 dst += retval;
776 count -= retval;
777 }
778 *ppos = dst;
779 free_page((unsigned long) page);
780 return copied;
781}
782#endif
783
784static loff_t mem_lseek(struct file * file, loff_t offset, int orig)
785{
786 switch (orig) {
787 case 0:
788 file->f_pos = offset;
789 break;
790 case 1:
791 file->f_pos += offset;
792 break;
793 default:
794 return -EINVAL;
795 }
796 force_successful_syscall_return();
797 return file->f_pos;
798}
799
800static struct file_operations proc_mem_operations = {
801 .llseek = mem_lseek,
802 .read = mem_read,
803 .write = mem_write,
804 .open = mem_open,
805};
806
807static ssize_t oom_adjust_read(struct file *file, char __user *buf,
808 size_t count, loff_t *ppos)
809{
810 struct task_struct *task = proc_task(file->f_dentry->d_inode);
811 char buffer[8];
812 size_t len;
813 int oom_adjust = task->oomkilladj;
814 loff_t __ppos = *ppos;
815
816 len = sprintf(buffer, "%i\n", oom_adjust);
817 if (__ppos >= len)
818 return 0;
819 if (count > len-__ppos)
820 count = len-__ppos;
821 if (copy_to_user(buf, buffer + __ppos, count))
822 return -EFAULT;
823 *ppos = __ppos + count;
824 return count;
825}
826
827static ssize_t oom_adjust_write(struct file *file, const char __user *buf,
828 size_t count, loff_t *ppos)
829{
830 struct task_struct *task = proc_task(file->f_dentry->d_inode);
831 char buffer[8], *end;
832 int oom_adjust;
833
834 if (!capable(CAP_SYS_RESOURCE))
835 return -EPERM;
836 memset(buffer, 0, 8);
837 if (count > 6)
838 count = 6;
839 if (copy_from_user(buffer, buf, count))
840 return -EFAULT;
841 oom_adjust = simple_strtol(buffer, &end, 0);
79befd0c 842 if ((oom_adjust < -16 || oom_adjust > 15) && oom_adjust != OOM_DISABLE)
1da177e4
LT		 843 return -EINVAL;
844 if (*end == '\n')
845 end++;
846 task->oomkilladj = oom_adjust;
847 if (end - buffer == 0)
848 return -EIO;
849 return end - buffer;
850}
851
852static struct file_operations proc_oom_adjust_operations = {
853 .read = oom_adjust_read,
854 .write = oom_adjust_write,
855};
856
857static struct inode_operations proc_mem_inode_operations = {
858 .permission = proc_permission,
859};
860
861#ifdef CONFIG_AUDITSYSCALL
862#define TMPBUFLEN 21
863static ssize_t proc_loginuid_read(struct file * file, char __user * buf,
864 size_t count, loff_t *ppos)
865{
866 struct inode * inode = file->f_dentry->d_inode;
867 struct task_struct *task = proc_task(inode);
868 ssize_t length;
869 char tmpbuf[TMPBUFLEN];
870
871 length = scnprintf(tmpbuf, TMPBUFLEN, "%u",
872 audit_get_loginuid(task->audit_context));
873 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
874}
875
876static ssize_t proc_loginuid_write(struct file * file, const char __user * buf,
877 size_t count, loff_t *ppos)
878{
879 struct inode * inode = file->f_dentry->d_inode;
880 char *page, *tmp;
881 ssize_t length;
882 struct task_struct *task = proc_task(inode);
883 uid_t loginuid;
884
885 if (!capable(CAP_AUDIT_CONTROL))
886 return -EPERM;
887
888 if (current != task)
889 return -EPERM;
890
891 if (count > PAGE_SIZE)
892 count = PAGE_SIZE;
893
894 if (*ppos != 0) {
895 /* No partial writes. */
896 return -EINVAL;
897 }
898 page = (char*)__get_free_page(GFP_USER);
899 if (!page)
900 return -ENOMEM;
901 length = -EFAULT;
902 if (copy_from_user(page, buf, count))
903 goto out_free_page;
904
905 loginuid = simple_strtoul(page, &tmp, 10);
906 if (tmp == page) {
907 length = -EINVAL;
908 goto out_free_page;
909
910 }
456be6cd 911 length = audit_set_loginuid(task, loginuid);
1da177e4
LT		 912 if (likely(length == 0))
913 length = count;
914
915out_free_page:
916 free_page((unsigned long) page);
917 return length;
918}
919
920static struct file_operations proc_loginuid_operations = {
921 .read = proc_loginuid_read,
922 .write = proc_loginuid_write,
923};
924#endif
925
926#ifdef CONFIG_SECCOMP
927static ssize_t seccomp_read(struct file *file, char __user *buf,
928 size_t count, loff_t *ppos)
929{
930 struct task_struct *tsk = proc_task(file->f_dentry->d_inode);
931 char __buf[20];
932 loff_t __ppos = *ppos;
933 size_t len;
934
935 /* no need to print the trailing zero, so use only len */
936 len = sprintf(__buf, "%u\n", tsk->seccomp.mode);
937 if (__ppos >= len)
938 return 0;
939 if (count > len - __ppos)
940 count = len - __ppos;
941 if (copy_to_user(buf, __buf + __ppos, count))
942 return -EFAULT;
943 *ppos = __ppos + count;
944 return count;
945}
946
947static ssize_t seccomp_write(struct file *file, const char __user *buf,
948 size_t count, loff_t *ppos)
949{
950 struct task_struct *tsk = proc_task(file->f_dentry->d_inode);
951 char __buf[20], *end;
952 unsigned int seccomp_mode;
953
954 /* can set it only once to be even more secure */
955 if (unlikely(tsk->seccomp.mode))
956 return -EPERM;
957
958 memset(__buf, 0, sizeof(__buf));
959 count = min(count, sizeof(__buf) - 1);
960 if (copy_from_user(__buf, buf, count))
961 return -EFAULT;
962 seccomp_mode = simple_strtoul(__buf, &end, 0);
963 if (*end == '\n')
964 end++;
965 if (seccomp_mode && seccomp_mode <= NR_SECCOMP_MODES) {
966 tsk->seccomp.mode = seccomp_mode;
967 set_tsk_thread_flag(tsk, TIF_SECCOMP);
968 } else
969 return -EINVAL;
970 if (unlikely(!(end - __buf)))
971 return -EIO;
972 return end - __buf;
973}
974
975static struct file_operations proc_seccomp_operations = {
976 .read = seccomp_read,
977 .write = seccomp_write,
978};
979#endif /* CONFIG_SECCOMP */
980
008b150a 981static void *proc_pid_follow_link(struct dentry *dentry, struct nameidata *nd)
1da177e4
LT		 982{
983 struct inode *inode = dentry->d_inode;
984 int error = -EACCES;
985
986 /* We don't need a base pointer in the /proc filesystem */
987 path_release(nd);
988
989 if (current->fsuid != inode->i_uid && !capable(CAP_DAC_OVERRIDE))
990 goto out;
991 error = proc_check_root(inode);
992 if (error)
993 goto out;
994
995 error = PROC_I(inode)->op.proc_get_link(inode, &nd->dentry, &nd->mnt);
996 nd->last_type = LAST_BIND;
997out:
008b150a 998 return ERR_PTR(error);
1da177e4
LT		 999}
1000
1001static int do_proc_readlink(struct dentry *dentry, struct vfsmount *mnt,
1002 char __user *buffer, int buflen)
1003{
1004 struct inode * inode;
1005 char *tmp = (char*)__get_free_page(GFP_KERNEL), *path;
1006 int len;
1007
1008 if (!tmp)
1009 return -ENOMEM;
1010
1011 inode = dentry->d_inode;
1012 path = d_path(dentry, mnt, tmp, PAGE_SIZE);
1013 len = PTR_ERR(path);
1014 if (IS_ERR(path))
1015 goto out;
1016 len = tmp + PAGE_SIZE - 1 - path;
1017
1018 if (len > buflen)
1019 len = buflen;
1020 if (copy_to_user(buffer, path, len))
1021 len = -EFAULT;
1022 out:
1023 free_page((unsigned long)tmp);
1024 return len;
1025}
1026
1027static int proc_pid_readlink(struct dentry * dentry, char __user * buffer, int buflen)
1028{
1029 int error = -EACCES;
1030 struct inode *inode = dentry->d_inode;
1031 struct dentry *de;
1032 struct vfsmount *mnt = NULL;
1033
1034 lock_kernel();
1035
1036 if (current->fsuid != inode->i_uid && !capable(CAP_DAC_OVERRIDE))
1037 goto out;
1038 error = proc_check_root(inode);
1039 if (error)
1040 goto out;
1041
1042 error = PROC_I(inode)->op.proc_get_link(inode, &de, &mnt);
1043 if (error)
1044 goto out;
1045
1046 error = do_proc_readlink(de, mnt, buffer, buflen);
1047 dput(de);
1048 mntput(mnt);
1049out:
1050 unlock_kernel();
1051 return error;
1052}
1053
1054static struct inode_operations proc_pid_link_inode_operations = {
1055 .readlink = proc_pid_readlink,
1056 .follow_link = proc_pid_follow_link
1057};
1058
1059#define NUMBUF 10
1060
1061static int proc_readfd(struct file * filp, void * dirent, filldir_t filldir)
1062{
1063 struct inode *inode = filp->f_dentry->d_inode;
1064 struct task_struct *p = proc_task(inode);
1065 unsigned int fd, tid, ino;
1066 int retval;
1067 char buf[NUMBUF];
1068 struct files_struct * files;
1069
1070 retval = -ENOENT;
1071 if (!pid_alive(p))
1072 goto out;
1073 retval = 0;
1074 tid = p->pid;
1075
1076 fd = filp->f_pos;
1077 switch (fd) {
1078 case 0:
1079 if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0)
1080 goto out;
1081 filp->f_pos++;
1082 case 1:
1083 ino = fake_ino(tid, PROC_TID_INO);
1084 if (filldir(dirent, "..", 2, 1, ino, DT_DIR) < 0)
1085 goto out;
1086 filp->f_pos++;
1087 default:
1088 files = get_files_struct(p);
1089 if (!files)
1090 goto out;
1091 spin_lock(&files->file_lock);
1092 for (fd = filp->f_pos-2;
1093 fd < files->max_fds;
1094 fd++, filp->f_pos++) {
1095 unsigned int i,j;
1096
1097 if (!fcheck_files(files, fd))
1098 continue;
1099 spin_unlock(&files->file_lock);
1100
1101 j = NUMBUF;
1102 i = fd;
1103 do {
1104 j--;
1105 buf[j] = '0' + (i % 10);
1106 i /= 10;
1107 } while (i);
1108
1109 ino = fake_ino(tid, PROC_TID_FD_DIR + fd);
1110 if (filldir(dirent, buf+j, NUMBUF-j, fd+2, ino, DT_LNK) < 0) {
1111 spin_lock(&files->file_lock);
1112 break;
1113 }
1114 spin_lock(&files->file_lock);
1115 }
1116 spin_unlock(&files->file_lock);
1117 put_files_struct(files);
1118 }
1119out:
1120 return retval;
1121}
1122
1123static int proc_pident_readdir(struct file *filp,
1124 void *dirent, filldir_t filldir,
1125 struct pid_entry *ents, unsigned int nents)
1126{
1127 int i;
1128 int pid;
1129 struct dentry *dentry = filp->f_dentry;
1130 struct inode *inode = dentry->d_inode;
1131 struct pid_entry *p;
1132 ino_t ino;
1133 int ret;
1134
1135 ret = -ENOENT;
1136 if (!pid_alive(proc_task(inode)))
1137 goto out;
1138
1139 ret = 0;
1140 pid = proc_task(inode)->pid;
1141 i = filp->f_pos;
1142 switch (i) {
1143 case 0:
1144 ino = inode->i_ino;
1145 if (filldir(dirent, ".", 1, i, ino, DT_DIR) < 0)
1146 goto out;
1147 i++;
1148 filp->f_pos++;
1149 /* fall through */
1150 case 1:
1151 ino = parent_ino(dentry);
1152 if (filldir(dirent, "..", 2, i, ino, DT_DIR) < 0)
1153 goto out;
1154 i++;
1155 filp->f_pos++;
1156 /* fall through */
1157 default:
1158 i -= 2;
1159 if (i >= nents) {
1160 ret = 1;
1161 goto out;
1162 }
1163 p = ents + i;
1164 while (p->name) {
1165 if (filldir(dirent, p->name, p->len, filp->f_pos,
1166 fake_ino(pid, p->type), p->mode >> 12) < 0)
1167 goto out;
1168 filp->f_pos++;
1169 p++;
1170 }
1171 }
1172
1173 ret = 1;
1174out:
1175 return ret;
1176}
1177
1178static int proc_tgid_base_readdir(struct file * filp,
1179 void * dirent, filldir_t filldir)
1180{
1181 return proc_pident_readdir(filp,dirent,filldir,
1182 tgid_base_stuff,ARRAY_SIZE(tgid_base_stuff));
1183}
1184
1185static int proc_tid_base_readdir(struct file * filp,
1186 void * dirent, filldir_t filldir)
1187{
1188 return proc_pident_readdir(filp,dirent,filldir,
1189 tid_base_stuff,ARRAY_SIZE(tid_base_stuff));
1190}
1191
1192/* building an inode */
1193
1194static int task_dumpable(struct task_struct *task)
1195{
1196 int dumpable = 0;
1197 struct mm_struct *mm;
1198
1199 task_lock(task);
1200 mm = task->mm;
1201 if (mm)
1202 dumpable = mm->dumpable;
1203 task_unlock(task);
d6e71144
AC		 1204 if(dumpable == 1)
1205 return 1;
1206 return 0;
1da177e4
LT		 1207}
1208
1209
1210static struct inode *proc_pid_make_inode(struct super_block * sb, struct task_struct *task, int ino)
1211{
1212 struct inode * inode;
1213 struct proc_inode *ei;
1214
1215 /* We need a new inode */
1216
1217 inode = new_inode(sb);
1218 if (!inode)
1219 goto out;
1220
1221 /* Common stuff */
1222 ei = PROC_I(inode);
1223 ei->task = NULL;
1224 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
1225 inode->i_ino = fake_ino(task->pid, ino);
1226
1227 if (!pid_alive(task))
1228 goto out_unlock;
1229
1230 /*
1231 * grab the reference to task.
1232 */
1233 get_task_struct(task);
1234 ei->task = task;
1235 ei->type = ino;
1236 inode->i_uid = 0;
1237 inode->i_gid = 0;
1238 if (ino == PROC_TGID_INO || ino == PROC_TID_INO || task_dumpable(task)) {
1239 inode->i_uid = task->euid;
1240 inode->i_gid = task->egid;
1241 }
1242 security_task_to_inode(task, inode);
1243
1244out:
1245 return inode;
1246
1247out_unlock:
1248 ei->pde = NULL;
1249 iput(inode);
1250 return NULL;
1251}
1252
1253/* dentry stuff */
1254
1255/*
1256 * Exceptional case: normally we are not allowed to unhash a busy
1257 * directory. In this case, however, we can do it - no aliasing problems
1258 * due to the way we treat inodes.
1259 *
1260 * Rewrite the inode's ownerships here because the owning task may have
1261 * performed a setuid(), etc.
1262 */
1263static int pid_revalidate(struct dentry *dentry, struct nameidata *nd)
1264{
1265 struct inode *inode = dentry->d_inode;
1266 struct task_struct *task = proc_task(inode);
1267 if (pid_alive(task)) {
1268 if (proc_type(inode) == PROC_TGID_INO || proc_type(inode) == PROC_TID_INO || task_dumpable(task)) {
1269 inode->i_uid = task->euid;
1270 inode->i_gid = task->egid;
1271 } else {
1272 inode->i_uid = 0;
1273 inode->i_gid = 0;
1274 }
1275 security_task_to_inode(task, inode);
1276 return 1;
1277 }
1278 d_drop(dentry);
1279 return 0;
1280}
1281
1282static int tid_fd_revalidate(struct dentry *dentry, struct nameidata *nd)
1283{
1284 struct inode *inode = dentry->d_inode;
1285 struct task_struct *task = proc_task(inode);
1286 int fd = proc_type(inode) - PROC_TID_FD_DIR;
1287 struct files_struct *files;
1288
1289 files = get_files_struct(task);
1290 if (files) {
1291 spin_lock(&files->file_lock);
1292 if (fcheck_files(files, fd)) {
1293 spin_unlock(&files->file_lock);
1294 put_files_struct(files);
1295 if (task_dumpable(task)) {
1296 inode->i_uid = task->euid;
1297 inode->i_gid = task->egid;
1298 } else {
1299 inode->i_uid = 0;
1300 inode->i_gid = 0;
1301 }
1302 security_task_to_inode(task, inode);
1303 return 1;
1304 }
1305 spin_unlock(&files->file_lock);
1306 put_files_struct(files);
1307 }
1308 d_drop(dentry);
1309 return 0;
1310}
1311
1312static void pid_base_iput(struct dentry *dentry, struct inode *inode)
1313{
1314 struct task_struct *task = proc_task(inode);
1315 spin_lock(&task->proc_lock);
1316 if (task->proc_dentry == dentry)
1317 task->proc_dentry = NULL;
1318 spin_unlock(&task->proc_lock);
1319 iput(inode);
1320}
1321
1322static int pid_delete_dentry(struct dentry * dentry)
1323{
1324 /* Is the task we represent dead?
1325 * If so, then don't put the dentry on the lru list,
1326 * kill it immediately.
1327 */
1328 return !pid_alive(proc_task(dentry->d_inode));
1329}
1330
1331static struct dentry_operations tid_fd_dentry_operations =
1332{
1333 .d_revalidate = tid_fd_revalidate,
1334 .d_delete = pid_delete_dentry,
1335};
1336
1337static struct dentry_operations pid_dentry_operations =
1338{
1339 .d_revalidate = pid_revalidate,
1340 .d_delete = pid_delete_dentry,
1341};
1342
1343static struct dentry_operations pid_base_dentry_operations =
1344{
1345 .d_revalidate = pid_revalidate,
1346 .d_iput = pid_base_iput,
1347 .d_delete = pid_delete_dentry,
1348};
1349
1350/* Lookups */
1351
1352static unsigned name_to_int(struct dentry *dentry)
1353{
1354 const char *name = dentry->d_name.name;
1355 int len = dentry->d_name.len;
1356 unsigned n = 0;
1357
1358 if (len > 1 && *name == '0')
1359 goto out;
1360 while (len-- > 0) {
1361 unsigned c = *name++ - '0';
1362 if (c > 9)
1363 goto out;
1364 if (n >= (~0U-9)/10)
1365 goto out;
1366 n *= 10;
1367 n += c;
1368 }
1369 return n;
1370out:
1371 return ~0U;
1372}
1373
1374/* SMP-safe */
1375static struct dentry *proc_lookupfd(struct inode * dir, struct dentry * dentry, struct nameidata *nd)
1376{
1377 struct task_struct *task = proc_task(dir);
1378 unsigned fd = name_to_int(dentry);
1379 struct file * file;
1380 struct files_struct * files;
1381 struct inode *inode;
1382 struct proc_inode *ei;
1383
1384 if (fd == ~0U)
1385 goto out;
1386 if (!pid_alive(task))
1387 goto out;
1388
1389 inode = proc_pid_make_inode(dir->i_sb, task, PROC_TID_FD_DIR+fd);
1390 if (!inode)
1391 goto out;
1392 ei = PROC_I(inode);
1393 files = get_files_struct(task);
1394 if (!files)
1395 goto out_unlock;
1396 inode->i_mode = S_IFLNK;
1397 spin_lock(&files->file_lock);
1398 file = fcheck_files(files, fd);
1399 if (!file)
1400 goto out_unlock2;
1401 if (file->f_mode & 1)
1402 inode->i_mode |= S_IRUSR | S_IXUSR;
1403 if (file->f_mode & 2)
1404 inode->i_mode |= S_IWUSR | S_IXUSR;
1405 spin_unlock(&files->file_lock);
1406 put_files_struct(files);
1407 inode->i_op = &proc_pid_link_inode_operations;
1408 inode->i_size = 64;
1409 ei->op.proc_get_link = proc_fd_link;
1410 dentry->d_op = &tid_fd_dentry_operations;
1411 d_add(dentry, inode);
1412 return NULL;
1413
1414out_unlock2:
1415 spin_unlock(&files->file_lock);
1416 put_files_struct(files);
1417out_unlock:
1418 iput(inode);
1419out:
1420 return ERR_PTR(-ENOENT);
1421}
1422
1423static int proc_task_readdir(struct file * filp, void * dirent, filldir_t filldir);
1424static struct dentry *proc_task_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd);
1425
1426static struct file_operations proc_fd_operations = {
1427 .read = generic_read_dir,
1428 .readdir = proc_readfd,
1429};
1430
1431static struct file_operations proc_task_operations = {
1432 .read = generic_read_dir,
1433 .readdir = proc_task_readdir,
1434};
1435
1436/*
1437 * proc directories can do almost nothing..
1438 */
1439static struct inode_operations proc_fd_inode_operations = {
1440 .lookup = proc_lookupfd,
1441 .permission = proc_permission,
1442};
1443
1444static struct inode_operations proc_task_inode_operations = {
1445 .lookup = proc_task_lookup,
1446 .permission = proc_permission,
1447};
1448
1449#ifdef CONFIG_SECURITY
1450static ssize_t proc_pid_attr_read(struct file * file, char __user * buf,
1451 size_t count, loff_t *ppos)
1452{
1453 struct inode * inode = file->f_dentry->d_inode;
1454 unsigned long page;
1455 ssize_t length;
1456 struct task_struct *task = proc_task(inode);
1457
1458 if (count > PAGE_SIZE)
1459 count = PAGE_SIZE;
1460 if (!(page = __get_free_page(GFP_KERNEL)))
1461 return -ENOMEM;
1462
1463 length = security_getprocattr(task,
1464 (char*)file->f_dentry->d_name.name,
1465 (void*)page, count);
1466 if (length >= 0)
1467 length = simple_read_from_buffer(buf, count, ppos, (char *)page, length);
1468 free_page(page);
1469 return length;
1470}
1471
1472static ssize_t proc_pid_attr_write(struct file * file, const char __user * buf,
1473 size_t count, loff_t *ppos)
1474{
1475 struct inode * inode = file->f_dentry->d_inode;
1476 char *page;
1477 ssize_t length;
1478 struct task_struct *task = proc_task(inode);
1479
1480 if (count > PAGE_SIZE)
1481 count = PAGE_SIZE;
1482 if (*ppos != 0) {
1483 /* No partial writes. */
1484 return -EINVAL;
1485 }
1486 page = (char*)__get_free_page(GFP_USER);
1487 if (!page)
1488 return -ENOMEM;
1489 length = -EFAULT;
1490 if (copy_from_user(page, buf, count))
1491 goto out;
1492
1493 length = security_setprocattr(task,
1494 (char*)file->f_dentry->d_name.name,
1495 (void*)page, count);
1496out:
1497 free_page((unsigned long) page);
1498 return length;
1499}
1500
1501static struct file_operations proc_pid_attr_operations = {
1502 .read = proc_pid_attr_read,
1503 .write = proc_pid_attr_write,
1504};
1505
1506static struct file_operations proc_tid_attr_operations;
1507static struct inode_operations proc_tid_attr_inode_operations;
1508static struct file_operations proc_tgid_attr_operations;
1509static struct inode_operations proc_tgid_attr_inode_operations;
1510#endif
1511
f246315e
DD		 1512static int get_tid_list(int index, unsigned int *tids, struct inode *dir);
1513
1da177e4
LT		 1514/* SMP-safe */
1515static struct dentry *proc_pident_lookup(struct inode *dir,
1516 struct dentry *dentry,
1517 struct pid_entry *ents)
1518{
1519 struct inode *inode;
1520 int error;
1521 struct task_struct *task = proc_task(dir);
1522 struct pid_entry *p;
1523 struct proc_inode *ei;
1524
1525 error = -ENOENT;
1526 inode = NULL;
1527
1528 if (!pid_alive(task))
1529 goto out;
1530
1531 for (p = ents; p->name; p++) {
1532 if (p->len != dentry->d_name.len)
1533 continue;
1534 if (!memcmp(dentry->d_name.name, p->name, p->len))
1535 break;
1536 }
1537 if (!p->name)
1538 goto out;
1539
1540 error = -EINVAL;
1541 inode = proc_pid_make_inode(dir->i_sb, task, p->type);
1542 if (!inode)
1543 goto out;
1544
1545 ei = PROC_I(inode);
1546 inode->i_mode = p->mode;
1547 /*
1548 * Yes, it does not scale. And it should not. Don't add
1549 * new entries into /proc/<tgid>/ without very good reasons.
1550 */
1551 switch(p->type) {
1552 case PROC_TGID_TASK:
f246315e 1553 inode->i_nlink = 2 + get_tid_list(2, NULL, dir);
1da177e4
LT		 1554 inode->i_op = &proc_task_inode_operations;
1555 inode->i_fop = &proc_task_operations;
1556 break;
1557 case PROC_TID_FD:
1558 case PROC_TGID_FD:
1559 inode->i_nlink = 2;
1560 inode->i_op = &proc_fd_inode_operations;
1561 inode->i_fop = &proc_fd_operations;
1562 break;
1563 case PROC_TID_EXE:
1564 case PROC_TGID_EXE:
1565 inode->i_op = &proc_pid_link_inode_operations;
1566 ei->op.proc_get_link = proc_exe_link;
1567 break;
1568 case PROC_TID_CWD:
1569 case PROC_TGID_CWD:
1570 inode->i_op = &proc_pid_link_inode_operations;
1571 ei->op.proc_get_link = proc_cwd_link;
1572 break;
1573 case PROC_TID_ROOT:
1574 case PROC_TGID_ROOT:
1575 inode->i_op = &proc_pid_link_inode_operations;
1576 ei->op.proc_get_link = proc_root_link;
1577 break;
1578 case PROC_TID_ENVIRON:
1579 case PROC_TGID_ENVIRON:
1580 inode->i_fop = &proc_info_file_operations;
1581 ei->op.proc_read = proc_pid_environ;
1582 break;
1583 case PROC_TID_AUXV:
1584 case PROC_TGID_AUXV:
1585 inode->i_fop = &proc_info_file_operations;
1586 ei->op.proc_read = proc_pid_auxv;
1587 break;
1588 case PROC_TID_STATUS:
1589 case PROC_TGID_STATUS:
1590 inode->i_fop = &proc_info_file_operations;
1591 ei->op.proc_read = proc_pid_status;
1592 break;
1593 case PROC_TID_STAT:
1594 inode->i_fop = &proc_info_file_operations;
1595 ei->op.proc_read = proc_tid_stat;
1596 break;
1597 case PROC_TGID_STAT:
1598 inode->i_fop = &proc_info_file_operations;
1599 ei->op.proc_read = proc_tgid_stat;
1600 break;
1601 case PROC_TID_CMDLINE:
1602 case PROC_TGID_CMDLINE:
1603 inode->i_fop = &proc_info_file_operations;
1604 ei->op.proc_read = proc_pid_cmdline;
1605 break;
1606 case PROC_TID_STATM:
1607 case PROC_TGID_STATM:
1608 inode->i_fop = &proc_info_file_operations;
1609 ei->op.proc_read = proc_pid_statm;
1610 break;
1611 case PROC_TID_MAPS:
1612 case PROC_TGID_MAPS:
1613 inode->i_fop = &proc_maps_operations;
1614 break;
6e21c8f1
CL		 1615#ifdef CONFIG_NUMA
1616 case PROC_TID_NUMA_MAPS:
1617 case PROC_TGID_NUMA_MAPS:
1618 inode->i_fop = &proc_numa_maps_operations;
1619 break;
1620#endif
1da177e4
LT		 1621 case PROC_TID_MEM:
1622 case PROC_TGID_MEM:
1623 inode->i_op = &proc_mem_inode_operations;
1624 inode->i_fop = &proc_mem_operations;
1625 break;
1626#ifdef CONFIG_SECCOMP
1627 case PROC_TID_SECCOMP:
1628 case PROC_TGID_SECCOMP:
1629 inode->i_fop = &proc_seccomp_operations;
1630 break;
1631#endif /* CONFIG_SECCOMP */
1632 case PROC_TID_MOUNTS:
1633 case PROC_TGID_MOUNTS:
1634 inode->i_fop = &proc_mounts_operations;
1635 break;
e070ad49
ML		 1636 case PROC_TID_SMAPS:
1637 case PROC_TGID_SMAPS:
1638 inode->i_fop = &proc_smaps_operations;
1639 break;
1da177e4
LT		 1640#ifdef CONFIG_SECURITY
1641 case PROC_TID_ATTR:
1642 inode->i_nlink = 2;
1643 inode->i_op = &proc_tid_attr_inode_operations;
1644 inode->i_fop = &proc_tid_attr_operations;
1645 break;
1646 case PROC_TGID_ATTR:
1647 inode->i_nlink = 2;
1648 inode->i_op = &proc_tgid_attr_inode_operations;
1649 inode->i_fop = &proc_tgid_attr_operations;
1650 break;
1651 case PROC_TID_ATTR_CURRENT:
1652 case PROC_TGID_ATTR_CURRENT:
1653 case PROC_TID_ATTR_PREV:
1654 case PROC_TGID_ATTR_PREV:
1655 case PROC_TID_ATTR_EXEC:
1656 case PROC_TGID_ATTR_EXEC:
1657 case PROC_TID_ATTR_FSCREATE:
1658 case PROC_TGID_ATTR_FSCREATE:
1659 inode->i_fop = &proc_pid_attr_operations;
1660 break;
1661#endif
1662#ifdef CONFIG_KALLSYMS
1663 case PROC_TID_WCHAN:
1664 case PROC_TGID_WCHAN:
1665 inode->i_fop = &proc_info_file_operations;
1666 ei->op.proc_read = proc_pid_wchan;
1667 break;
1668#endif
1669#ifdef CONFIG_SCHEDSTATS
1670 case PROC_TID_SCHEDSTAT:
1671 case PROC_TGID_SCHEDSTAT:
1672 inode->i_fop = &proc_info_file_operations;
1673 ei->op.proc_read = proc_pid_schedstat;
1674 break;
1675#endif
1676#ifdef CONFIG_CPUSETS
1677 case PROC_TID_CPUSET:
1678 case PROC_TGID_CPUSET:
1679 inode->i_fop = &proc_cpuset_operations;
1680 break;
1681#endif
1682 case PROC_TID_OOM_SCORE:
1683 case PROC_TGID_OOM_SCORE:
1684 inode->i_fop = &proc_info_file_operations;
1685 ei->op.proc_read = proc_oom_score;
1686 break;
1687 case PROC_TID_OOM_ADJUST:
1688 case PROC_TGID_OOM_ADJUST:
1689 inode->i_fop = &proc_oom_adjust_operations;
1690 break;
1691#ifdef CONFIG_AUDITSYSCALL
1692 case PROC_TID_LOGINUID:
1693 case PROC_TGID_LOGINUID:
1694 inode->i_fop = &proc_loginuid_operations;
1695 break;
1696#endif
1697 default:
1698 printk("procfs: impossible type (%d)",p->type);
1699 iput(inode);
1700 return ERR_PTR(-EINVAL);
1701 }
1702 dentry->d_op = &pid_dentry_operations;
1703 d_add(dentry, inode);
1704 return NULL;
1705
1706out:
1707 return ERR_PTR(error);
1708}
1709
1710static struct dentry *proc_tgid_base_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd){
1711 return proc_pident_lookup(dir, dentry, tgid_base_stuff);
1712}
1713
1714static struct dentry *proc_tid_base_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd){
1715 return proc_pident_lookup(dir, dentry, tid_base_stuff);
1716}
1717
1718static struct file_operations proc_tgid_base_operations = {
1719 .read = generic_read_dir,
1720 .readdir = proc_tgid_base_readdir,
1721};
1722
1723static struct file_operations proc_tid_base_operations = {
1724 .read = generic_read_dir,
1725 .readdir = proc_tid_base_readdir,
1726};
1727
1728static struct inode_operations proc_tgid_base_inode_operations = {
1729 .lookup = proc_tgid_base_lookup,
1730};
1731
1732static struct inode_operations proc_tid_base_inode_operations = {
1733 .lookup = proc_tid_base_lookup,
1734};
1735
1736#ifdef CONFIG_SECURITY
1737static int proc_tgid_attr_readdir(struct file * filp,
1738 void * dirent, filldir_t filldir)
1739{
1740 return proc_pident_readdir(filp,dirent,filldir,
1741 tgid_attr_stuff,ARRAY_SIZE(tgid_attr_stuff));
1742}
1743
1744static int proc_tid_attr_readdir(struct file * filp,
1745 void * dirent, filldir_t filldir)
1746{
1747 return proc_pident_readdir(filp,dirent,filldir,
1748 tid_attr_stuff,ARRAY_SIZE(tid_attr_stuff));
1749}
1750
1751static struct file_operations proc_tgid_attr_operations = {
1752 .read = generic_read_dir,
1753 .readdir = proc_tgid_attr_readdir,
1754};
1755
1756static struct file_operations proc_tid_attr_operations = {
1757 .read = generic_read_dir,
1758 .readdir = proc_tid_attr_readdir,
1759};
1760
1761static struct dentry *proc_tgid_attr_lookup(struct inode *dir,
1762 struct dentry *dentry, struct nameidata *nd)
1763{
1764 return proc_pident_lookup(dir, dentry, tgid_attr_stuff);
1765}
1766
1767static struct dentry *proc_tid_attr_lookup(struct inode *dir,
1768 struct dentry *dentry, struct nameidata *nd)
1769{
1770 return proc_pident_lookup(dir, dentry, tid_attr_stuff);
1771}
1772
1773static struct inode_operations proc_tgid_attr_inode_operations = {
1774 .lookup = proc_tgid_attr_lookup,
1775};
1776
1777static struct inode_operations proc_tid_attr_inode_operations = {
1778 .lookup = proc_tid_attr_lookup,
1779};
1780#endif
1781
1782/*
1783 * /proc/self:
1784 */
1785static int proc_self_readlink(struct dentry *dentry, char __user *buffer,
1786 int buflen)
1787{
1788 char tmp[30];
1789 sprintf(tmp, "%d", current->tgid);
1790 return vfs_readlink(dentry,buffer,buflen,tmp);
1791}
1792
008b150a 1793static void *proc_self_follow_link(struct dentry *dentry, struct nameidata *nd)
1da177e4
LT		 1794{
1795 char tmp[30];
1796 sprintf(tmp, "%d", current->tgid);
008b150a 1797 return ERR_PTR(vfs_follow_link(nd,tmp));
1da177e4
LT		 1798}
1799
1800static struct inode_operations proc_self_inode_operations = {
1801 .readlink = proc_self_readlink,
1802 .follow_link = proc_self_follow_link,
1803};
1804
1805/**
4dc3b16b 1806 * proc_pid_unhash - Unhash /proc/@pid entry from the dcache.
1da177e4
LT		 1807 * @p: task that should be flushed.
1808 *
4dc3b16b 1809 * Drops the /proc/@pid dcache entry from the hash chains.
1da177e4 1810 *
4dc3b16b
PP		 1811 * Dropping /proc/@pid entries and detach_pid must be synchroneous,
1812 * otherwise e.g. /proc/@pid/exe might point to the wrong executable,
1da177e4
LT		 1813 * if the pid value is immediately reused. This is enforced by
1814 * - caller must acquire spin_lock(p->proc_lock)
1815 * - must be called before detach_pid()
1816 * - proc_pid_lookup acquires proc_lock, and checks that
1817 * the target is not dead by looking at the attach count
1818 * of PIDTYPE_PID.
1819 */
1820
1821struct dentry *proc_pid_unhash(struct task_struct *p)
1822{
1823 struct dentry *proc_dentry;
1824
1825 proc_dentry = p->proc_dentry;
1826 if (proc_dentry != NULL) {
1827
1828 spin_lock(&dcache_lock);
1829 spin_lock(&proc_dentry->d_lock);
1830 if (!d_unhashed(proc_dentry)) {
1831 dget_locked(proc_dentry);
1832 __d_drop(proc_dentry);
1833 spin_unlock(&proc_dentry->d_lock);
1834 } else {
1835 spin_unlock(&proc_dentry->d_lock);
1836 proc_dentry = NULL;
1837 }
1838 spin_unlock(&dcache_lock);
1839 }
1840 return proc_dentry;
1841}
1842
1843/**
4dc3b16b 1844 * proc_pid_flush - recover memory used by stale /proc/@pid/x entries
67be2dd1 1845 * @proc_dentry: directoy to prune.
1da177e4
LT		 1846 *
1847 * Shrink the /proc directory that was used by the just killed thread.
1848 */
1849
1850void proc_pid_flush(struct dentry *proc_dentry)
1851{
1852 might_sleep();
1853 if(proc_dentry != NULL) {
1854 shrink_dcache_parent(proc_dentry);
1855 dput(proc_dentry);
1856 }
1857}
1858
1859/* SMP-safe */
1860struct dentry *proc_pid_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd)
1861{
1862 struct task_struct *task;
1863 struct inode *inode;
1864 struct proc_inode *ei;
1865 unsigned tgid;
1866 int died;
1867
1868 if (dentry->d_name.len == 4 && !memcmp(dentry->d_name.name,"self",4)) {
1869 inode = new_inode(dir->i_sb);
1870 if (!inode)
1871 return ERR_PTR(-ENOMEM);
1872 ei = PROC_I(inode);
1873 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
1874 inode->i_ino = fake_ino(0, PROC_TGID_INO);
1875 ei->pde = NULL;
1876 inode->i_mode = S_IFLNK|S_IRWXUGO;
1877 inode->i_uid = inode->i_gid = 0;
1878 inode->i_size = 64;
1879 inode->i_op = &proc_self_inode_operations;
1880 d_add(dentry, inode);
1881 return NULL;
1882 }
1883 tgid = name_to_int(dentry);
1884 if (tgid == ~0U)
1885 goto out;
1886
1887 read_lock(&tasklist_lock);
1888 task = find_task_by_pid(tgid);
1889 if (task)
1890 get_task_struct(task);
1891 read_unlock(&tasklist_lock);
1892 if (!task)
1893 goto out;
1894
1895 inode = proc_pid_make_inode(dir->i_sb, task, PROC_TGID_INO);
1896
1897
1898 if (!inode) {
1899 put_task_struct(task);
1900 goto out;
1901 }
1902 inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO;
1903 inode->i_op = &proc_tgid_base_inode_operations;
1904 inode->i_fop = &proc_tgid_base_operations;
1da177e4 1905 inode->i_flags|=S_IMMUTABLE;
bcf88e11
DD		 1906#ifdef CONFIG_SECURITY
1907 inode->i_nlink = 5;
1908#else
1909 inode->i_nlink = 4;
1910#endif
1da177e4
LT		 1911
1912 dentry->d_op = &pid_base_dentry_operations;
1913
1914 died = 0;
1915 d_add(dentry, inode);
1916 spin_lock(&task->proc_lock);
1917 task->proc_dentry = dentry;
1918 if (!pid_alive(task)) {
1919 dentry = proc_pid_unhash(task);
1920 died = 1;
1921 }
1922 spin_unlock(&task->proc_lock);
1923
1924 put_task_struct(task);
1925 if (died) {
1926 proc_pid_flush(dentry);
1927 goto out;
1928 }
1929 return NULL;
1930out:
1931 return ERR_PTR(-ENOENT);
1932}
1933
1934/* SMP-safe */
1935static struct dentry *proc_task_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd)
1936{
1937 struct task_struct *task;
1938 struct task_struct *leader = proc_task(dir);
1939 struct inode *inode;
1940 unsigned tid;
1941
1942 tid = name_to_int(dentry);
1943 if (tid == ~0U)
1944 goto out;
1945
1946 read_lock(&tasklist_lock);
1947 task = find_task_by_pid(tid);
1948 if (task)
1949 get_task_struct(task);
1950 read_unlock(&tasklist_lock);
1951 if (!task)
1952 goto out;
1953 if (leader->tgid != task->tgid)
1954 goto out_drop_task;
1955
1956 inode = proc_pid_make_inode(dir->i_sb, task, PROC_TID_INO);
1957
1958
1959 if (!inode)
1960 goto out_drop_task;
1961 inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO;
1962 inode->i_op = &proc_tid_base_inode_operations;
1963 inode->i_fop = &proc_tid_base_operations;
1da177e4 1964 inode->i_flags|=S_IMMUTABLE;
bcf88e11
DD		 1965#ifdef CONFIG_SECURITY
1966 inode->i_nlink = 4;
1967#else
1968 inode->i_nlink = 3;
1969#endif
1da177e4
LT		 1970
1971 dentry->d_op = &pid_base_dentry_operations;
1972
1973 d_add(dentry, inode);
1974
1975 put_task_struct(task);
1976 return NULL;
1977out_drop_task:
1978 put_task_struct(task);
1979out:
1980 return ERR_PTR(-ENOENT);
1981}
1982
1983#define PROC_NUMBUF 10
1984#define PROC_MAXPIDS 20
1985
1986/*
1987 * Get a few tgid's to return for filldir - we need to hold the
1988 * tasklist lock while doing this, and we must release it before
1989 * we actually do the filldir itself, so we use a temp buffer..
1990 */
1991static int get_tgid_list(int index, unsigned long version, unsigned int *tgids)
1992{
1993 struct task_struct *p;
1994 int nr_tgids = 0;
1995
1996 index--;
1997 read_lock(&tasklist_lock);
1998 p = NULL;
1999 if (version) {
2000 p = find_task_by_pid(version);
2001 if (p && !thread_group_leader(p))
2002 p = NULL;
2003 }
2004
2005 if (p)
2006 index = 0;
2007 else
2008 p = next_task(&init_task);
2009
2010 for ( ; p != &init_task; p = next_task(p)) {
2011 int tgid = p->pid;
2012 if (!pid_alive(p))
2013 continue;
2014 if (--index >= 0)
2015 continue;
2016 tgids[nr_tgids] = tgid;
2017 nr_tgids++;
2018 if (nr_tgids >= PROC_MAXPIDS)
2019 break;
2020 }
2021 read_unlock(&tasklist_lock);
2022 return nr_tgids;
2023}
2024
2025/*
2026 * Get a few tid's to return for filldir - we need to hold the
2027 * tasklist lock while doing this, and we must release it before
2028 * we actually do the filldir itself, so we use a temp buffer..
2029 */
2030static int get_tid_list(int index, unsigned int *tids, struct inode *dir)
2031{
2032 struct task_struct *leader_task = proc_task(dir);
2033 struct task_struct *task = leader_task;
2034 int nr_tids = 0;
2035
2036 index -= 2;
2037 read_lock(&tasklist_lock);
2038 /*
2039 * The starting point task (leader_task) might be an already
2040 * unlinked task, which cannot be used to access the task-list
2041 * via next_thread().
2042 */
2043 if (pid_alive(task)) do {
2044 int tid = task->pid;
2045
2046 if (--index >= 0)
2047 continue;
f246315e
DD		 2048 if (tids != NULL)
2049 tids[nr_tids] = tid;
1da177e4
LT		 2050 nr_tids++;
2051 if (nr_tids >= PROC_MAXPIDS)
2052 break;
2053 } while ((task = next_thread(task)) != leader_task);
2054 read_unlock(&tasklist_lock);
2055 return nr_tids;
2056}
2057
2058/* for the /proc/ directory itself, after non-process stuff has been done */
2059int proc_pid_readdir(struct file * filp, void * dirent, filldir_t filldir)
2060{
2061 unsigned int tgid_array[PROC_MAXPIDS];
2062 char buf[PROC_NUMBUF];
2063 unsigned int nr = filp->f_pos - FIRST_PROCESS_ENTRY;
2064 unsigned int nr_tgids, i;
2065 int next_tgid;
2066
2067 if (!nr) {
2068 ino_t ino = fake_ino(0,PROC_TGID_INO);
2069 if (filldir(dirent, "self", 4, filp->f_pos, ino, DT_LNK) < 0)
2070 return 0;
2071 filp->f_pos++;
2072 nr++;
2073 }
2074
2075 /* f_version caches the tgid value that the last readdir call couldn't
2076 * return. lseek aka telldir automagically resets f_version to 0.
2077 */
2078 next_tgid = filp->f_version;
2079 filp->f_version = 0;
2080 for (;;) {
2081 nr_tgids = get_tgid_list(nr, next_tgid, tgid_array);
2082 if (!nr_tgids) {
2083 /* no more entries ! */
2084 break;
2085 }
2086 next_tgid = 0;
2087
2088 /* do not use the last found pid, reserve it for next_tgid */
2089 if (nr_tgids == PROC_MAXPIDS) {
2090 nr_tgids--;
2091 next_tgid = tgid_array[nr_tgids];
2092 }
2093
2094 for (i=0;i<nr_tgids;i++) {
2095 int tgid = tgid_array[i];
2096 ino_t ino = fake_ino(tgid,PROC_TGID_INO);
2097 unsigned long j = PROC_NUMBUF;
2098
2099 do
2100 buf[--j] = '0' + (tgid % 10);
2101 while ((tgid /= 10) != 0);
2102
2103 if (filldir(dirent, buf+j, PROC_NUMBUF-j, filp->f_pos, ino, DT_DIR) < 0) {
2104 /* returning this tgid failed, save it as the first
2105 * pid for the next readir call */
2106 filp->f_version = tgid_array[i];
2107 goto out;
2108 }
2109 filp->f_pos++;
2110 nr++;
2111 }
2112 }
2113out:
2114 return 0;
2115}
2116
2117/* for the /proc/TGID/task/ directories */
2118static int proc_task_readdir(struct file * filp, void * dirent, filldir_t filldir)
2119{
2120 unsigned int tid_array[PROC_MAXPIDS];
2121 char buf[PROC_NUMBUF];
2122 unsigned int nr_tids, i;
2123 struct dentry *dentry = filp->f_dentry;
2124 struct inode *inode = dentry->d_inode;
2125 int retval = -ENOENT;
2126 ino_t ino;
2127 unsigned long pos = filp->f_pos; /* avoiding "long long" filp->f_pos */
2128
2129 if (!pid_alive(proc_task(inode)))
2130 goto out;
2131 retval = 0;
2132
2133 switch (pos) {
2134 case 0:
2135 ino = inode->i_ino;
2136 if (filldir(dirent, ".", 1, pos, ino, DT_DIR) < 0)
2137 goto out;
2138 pos++;
2139 /* fall through */
2140 case 1:
2141 ino = parent_ino(dentry);
2142 if (filldir(dirent, "..", 2, pos, ino, DT_DIR) < 0)
2143 goto out;
2144 pos++;
2145 /* fall through */
2146 }
2147
2148 nr_tids = get_tid_list(pos, tid_array, inode);
f246315e 2149 inode->i_nlink = pos + nr_tids;
1da177e4
LT		 2150
2151 for (i = 0; i < nr_tids; i++) {
2152 unsigned long j = PROC_NUMBUF;
2153 int tid = tid_array[i];
2154
2155 ino = fake_ino(tid,PROC_TID_INO);
2156
2157 do
2158 buf[--j] = '0' + (tid % 10);
2159 while ((tid /= 10) != 0);
2160
2161 if (filldir(dirent, buf+j, PROC_NUMBUF-j, pos, ino, DT_DIR) < 0)
2162 break;
2163 pos++;
2164 }
2165out:
2166 filp->f_pos = pos;
2167 return retval;
2168}
Linux kernel - Deliverables
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