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[PATCH] namei cleanup
[linux-2.6-block.git] / fs / proc / base.c
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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
122 PROC_TGID_FD_DIR,
123 PROC_TGID_OOM_SCORE,
124 PROC_TGID_OOM_ADJUST,
125 PROC_TID_INO,
126 PROC_TID_STATUS,
127 PROC_TID_MEM,
128#ifdef CONFIG_SECCOMP
129 PROC_TID_SECCOMP,
130#endif
131 PROC_TID_CWD,
132 PROC_TID_ROOT,
133 PROC_TID_EXE,
134 PROC_TID_FD,
135 PROC_TID_ENVIRON,
136 PROC_TID_AUXV,
137 PROC_TID_CMDLINE,
138 PROC_TID_STAT,
139 PROC_TID_STATM,
140 PROC_TID_MAPS,
6e21c8f1 141 PROC_TID_NUMA_MAPS,
1da177e4
LT		 142 PROC_TID_MOUNTS,
143 PROC_TID_WCHAN,
e070ad49 144 PROC_TID_SMAPS,
1da177e4
LT		 145#ifdef CONFIG_SCHEDSTATS
146 PROC_TID_SCHEDSTAT,
147#endif
148#ifdef CONFIG_CPUSETS
149 PROC_TID_CPUSET,
150#endif
151#ifdef CONFIG_SECURITY
152 PROC_TID_ATTR,
153 PROC_TID_ATTR_CURRENT,
154 PROC_TID_ATTR_PREV,
155 PROC_TID_ATTR_EXEC,
156 PROC_TID_ATTR_FSCREATE,
157#endif
158#ifdef CONFIG_AUDITSYSCALL
159 PROC_TID_LOGINUID,
160#endif
161 PROC_TID_FD_DIR = 0x8000, /* 0x8000-0xffff */
162 PROC_TID_OOM_SCORE,
163 PROC_TID_OOM_ADJUST,
164};
165
166struct pid_entry {
167 int type;
168 int len;
169 char *name;
170 mode_t mode;
171};
172
173#define E(type,name,mode) {(type),sizeof(name)-1,(name),(mode)}
174
175static struct pid_entry tgid_base_stuff[] = {
176 E(PROC_TGID_TASK, "task", S_IFDIR|S_IRUGO|S_IXUGO),
177 E(PROC_TGID_FD, "fd", S_IFDIR|S_IRUSR|S_IXUSR),
178 E(PROC_TGID_ENVIRON, "environ", S_IFREG|S_IRUSR),
179 E(PROC_TGID_AUXV, "auxv", S_IFREG|S_IRUSR),
180 E(PROC_TGID_STATUS, "status", S_IFREG|S_IRUGO),
181 E(PROC_TGID_CMDLINE, "cmdline", S_IFREG|S_IRUGO),
182 E(PROC_TGID_STAT, "stat", S_IFREG|S_IRUGO),
183 E(PROC_TGID_STATM, "statm", S_IFREG|S_IRUGO),
184 E(PROC_TGID_MAPS, "maps", S_IFREG|S_IRUGO),
6e21c8f1
CL		 185#ifdef CONFIG_NUMA
186 E(PROC_TGID_NUMA_MAPS, "numa_maps", S_IFREG|S_IRUGO),
187#endif
1da177e4
LT		 188 E(PROC_TGID_MEM, "mem", S_IFREG|S_IRUSR|S_IWUSR),
189#ifdef CONFIG_SECCOMP
190 E(PROC_TGID_SECCOMP, "seccomp", S_IFREG|S_IRUSR|S_IWUSR),
191#endif
192 E(PROC_TGID_CWD, "cwd", S_IFLNK|S_IRWXUGO),
193 E(PROC_TGID_ROOT, "root", S_IFLNK|S_IRWXUGO),
194 E(PROC_TGID_EXE, "exe", S_IFLNK|S_IRWXUGO),
195 E(PROC_TGID_MOUNTS, "mounts", S_IFREG|S_IRUGO),
e070ad49 196 E(PROC_TGID_SMAPS, "smaps", S_IFREG|S_IRUGO),
1da177e4
LT		 197#ifdef CONFIG_SECURITY
198 E(PROC_TGID_ATTR, "attr", S_IFDIR|S_IRUGO|S_IXUGO),
199#endif
200#ifdef CONFIG_KALLSYMS
201 E(PROC_TGID_WCHAN, "wchan", S_IFREG|S_IRUGO),
202#endif
203#ifdef CONFIG_SCHEDSTATS
204 E(PROC_TGID_SCHEDSTAT, "schedstat", S_IFREG|S_IRUGO),
205#endif
206#ifdef CONFIG_CPUSETS
207 E(PROC_TGID_CPUSET, "cpuset", S_IFREG|S_IRUGO),
208#endif
209 E(PROC_TGID_OOM_SCORE, "oom_score",S_IFREG|S_IRUGO),
210 E(PROC_TGID_OOM_ADJUST,"oom_adj", S_IFREG|S_IRUGO|S_IWUSR),
211#ifdef CONFIG_AUDITSYSCALL
212 E(PROC_TGID_LOGINUID, "loginuid", S_IFREG|S_IWUSR|S_IRUGO),
213#endif
214 {0,0,NULL,0}
215};
216static struct pid_entry tid_base_stuff[] = {
217 E(PROC_TID_FD, "fd", S_IFDIR|S_IRUSR|S_IXUSR),
218 E(PROC_TID_ENVIRON, "environ", S_IFREG|S_IRUSR),
219 E(PROC_TID_AUXV, "auxv", S_IFREG|S_IRUSR),
220 E(PROC_TID_STATUS, "status", S_IFREG|S_IRUGO),
221 E(PROC_TID_CMDLINE, "cmdline", S_IFREG|S_IRUGO),
222 E(PROC_TID_STAT, "stat", S_IFREG|S_IRUGO),
223 E(PROC_TID_STATM, "statm", S_IFREG|S_IRUGO),
224 E(PROC_TID_MAPS, "maps", S_IFREG|S_IRUGO),
6e21c8f1
CL		 225#ifdef CONFIG_NUMA
226 E(PROC_TID_NUMA_MAPS, "numa_maps", S_IFREG|S_IRUGO),
227#endif
1da177e4
LT		 228 E(PROC_TID_MEM, "mem", S_IFREG|S_IRUSR|S_IWUSR),
229#ifdef CONFIG_SECCOMP
230 E(PROC_TID_SECCOMP, "seccomp", S_IFREG|S_IRUSR|S_IWUSR),
231#endif
232 E(PROC_TID_CWD, "cwd", S_IFLNK|S_IRWXUGO),
233 E(PROC_TID_ROOT, "root", S_IFLNK|S_IRWXUGO),
234 E(PROC_TID_EXE, "exe", S_IFLNK|S_IRWXUGO),
235 E(PROC_TID_MOUNTS, "mounts", S_IFREG|S_IRUGO),
e070ad49 236 E(PROC_TID_SMAPS, "smaps", S_IFREG|S_IRUGO),
1da177e4
LT		 237#ifdef CONFIG_SECURITY
238 E(PROC_TID_ATTR, "attr", S_IFDIR|S_IRUGO|S_IXUGO),
239#endif
240#ifdef CONFIG_KALLSYMS
241 E(PROC_TID_WCHAN, "wchan", S_IFREG|S_IRUGO),
242#endif
243#ifdef CONFIG_SCHEDSTATS
244 E(PROC_TID_SCHEDSTAT, "schedstat",S_IFREG|S_IRUGO),
245#endif
246#ifdef CONFIG_CPUSETS
247 E(PROC_TID_CPUSET, "cpuset", S_IFREG|S_IRUGO),
248#endif
249 E(PROC_TID_OOM_SCORE, "oom_score",S_IFREG|S_IRUGO),
250 E(PROC_TID_OOM_ADJUST, "oom_adj", S_IFREG|S_IRUGO|S_IWUSR),
251#ifdef CONFIG_AUDITSYSCALL
252 E(PROC_TID_LOGINUID, "loginuid", S_IFREG|S_IWUSR|S_IRUGO),
253#endif
254 {0,0,NULL,0}
255};
256
257#ifdef CONFIG_SECURITY
258static struct pid_entry tgid_attr_stuff[] = {
259 E(PROC_TGID_ATTR_CURRENT, "current", S_IFREG|S_IRUGO|S_IWUGO),
260 E(PROC_TGID_ATTR_PREV, "prev", S_IFREG|S_IRUGO),
261 E(PROC_TGID_ATTR_EXEC, "exec", S_IFREG|S_IRUGO|S_IWUGO),
262 E(PROC_TGID_ATTR_FSCREATE, "fscreate", S_IFREG|S_IRUGO|S_IWUGO),
263 {0,0,NULL,0}
264};
265static struct pid_entry tid_attr_stuff[] = {
266 E(PROC_TID_ATTR_CURRENT, "current", S_IFREG|S_IRUGO|S_IWUGO),
267 E(PROC_TID_ATTR_PREV, "prev", S_IFREG|S_IRUGO),
268 E(PROC_TID_ATTR_EXEC, "exec", S_IFREG|S_IRUGO|S_IWUGO),
269 E(PROC_TID_ATTR_FSCREATE, "fscreate", S_IFREG|S_IRUGO|S_IWUGO),
270 {0,0,NULL,0}
271};
272#endif
273
274#undef E
275
276static int proc_fd_link(struct inode *inode, struct dentry **dentry, struct vfsmount **mnt)
277{
278 struct task_struct *task = proc_task(inode);
279 struct files_struct *files;
280 struct file *file;
281 int fd = proc_type(inode) - PROC_TID_FD_DIR;
282
283 files = get_files_struct(task);
284 if (files) {
285 spin_lock(&files->file_lock);
286 file = fcheck_files(files, fd);
287 if (file) {
288 *mnt = mntget(file->f_vfsmnt);
289 *dentry = dget(file->f_dentry);
290 spin_unlock(&files->file_lock);
291 put_files_struct(files);
292 return 0;
293 }
294 spin_unlock(&files->file_lock);
295 put_files_struct(files);
296 }
297 return -ENOENT;
298}
299
300static int proc_cwd_link(struct inode *inode, struct dentry **dentry, struct vfsmount **mnt)
301{
302 struct fs_struct *fs;
303 int result = -ENOENT;
304 task_lock(proc_task(inode));
305 fs = proc_task(inode)->fs;
306 if(fs)
307 atomic_inc(&fs->count);
308 task_unlock(proc_task(inode));
309 if (fs) {
310 read_lock(&fs->lock);
311 *mnt = mntget(fs->pwdmnt);
312 *dentry = dget(fs->pwd);
313 read_unlock(&fs->lock);
314 result = 0;
315 put_fs_struct(fs);
316 }
317 return result;
318}
319
320static int proc_root_link(struct inode *inode, struct dentry **dentry, struct vfsmount **mnt)
321{
322 struct fs_struct *fs;
323 int result = -ENOENT;
324 task_lock(proc_task(inode));
325 fs = proc_task(inode)->fs;
326 if(fs)
327 atomic_inc(&fs->count);
328 task_unlock(proc_task(inode));
329 if (fs) {
330 read_lock(&fs->lock);
331 *mnt = mntget(fs->rootmnt);
332 *dentry = dget(fs->root);
333 read_unlock(&fs->lock);
334 result = 0;
335 put_fs_struct(fs);
336 }
337 return result;
338}
339
340#define MAY_PTRACE(task) \
341 (task == current || \
342 (task->parent == current && \
343 (task->ptrace & PT_PTRACED) && \
344 (task->state == TASK_STOPPED || task->state == TASK_TRACED) && \
345 security_ptrace(current,task) == 0))
346
347static int may_ptrace_attach(struct task_struct *task)
348{
349 int retval = 0;
350
351 task_lock(task);
352
353 if (!task->mm)
354 goto out;
355 if (((current->uid != task->euid) ||
356 (current->uid != task->suid) ||
357 (current->uid != task->uid) ||
358 (current->gid != task->egid) ||
359 (current->gid != task->sgid) ||
360 (current->gid != task->gid)) && !capable(CAP_SYS_PTRACE))
361 goto out;
362 rmb();
d6e71144 363 if (task->mm->dumpable != 1 && !capable(CAP_SYS_PTRACE))
1da177e4
LT		 364 goto out;
365 if (security_ptrace(current, task))
366 goto out;
367
368 retval = 1;
369out:
370 task_unlock(task);
371 return retval;
372}
373
374static int proc_pid_environ(struct task_struct *task, char * buffer)
375{
376 int res = 0;
377 struct mm_struct *mm = get_task_mm(task);
378 if (mm) {
379 unsigned int len = mm->env_end - mm->env_start;
380 if (len > PAGE_SIZE)
381 len = PAGE_SIZE;
382 res = access_process_vm(task, mm->env_start, buffer, len, 0);
383 if (!may_ptrace_attach(task))
384 res = -ESRCH;
385 mmput(mm);
386 }
387 return res;
388}
389
390static int proc_pid_cmdline(struct task_struct *task, char * buffer)
391{
392 int res = 0;
393 unsigned int len;
394 struct mm_struct *mm = get_task_mm(task);
395 if (!mm)
396 goto out;
397 if (!mm->arg_end)
398 goto out_mm; /* Shh! No looking before we're done */
399
400 len = mm->arg_end - mm->arg_start;
401
402 if (len > PAGE_SIZE)
403 len = PAGE_SIZE;
404
405 res = access_process_vm(task, mm->arg_start, buffer, len, 0);
406
407 // If the nul at the end of args has been overwritten, then
408 // assume application is using setproctitle(3).
409 if (res > 0 && buffer[res-1] != '\0' && len < PAGE_SIZE) {
410 len = strnlen(buffer, res);
411 if (len < res) {
412 res = len;
413 } else {
414 len = mm->env_end - mm->env_start;
415 if (len > PAGE_SIZE - res)
416 len = PAGE_SIZE - res;
417 res += access_process_vm(task, mm->env_start, buffer+res, len, 0);
418 res = strnlen(buffer, res);
419 }
420 }
421out_mm:
422 mmput(mm);
423out:
424 return res;
425}
426
427static int proc_pid_auxv(struct task_struct *task, char *buffer)
428{
429 int res = 0;
430 struct mm_struct *mm = get_task_mm(task);
431 if (mm) {
432 unsigned int nwords = 0;
433 do
434 nwords += 2;
435 while (mm->saved_auxv[nwords - 2] != 0); /* AT_NULL */
436 res = nwords * sizeof(mm->saved_auxv[0]);
437 if (res > PAGE_SIZE)
438 res = PAGE_SIZE;
439 memcpy(buffer, mm->saved_auxv, res);
440 mmput(mm);
441 }
442 return res;
443}
444
445
446#ifdef CONFIG_KALLSYMS
447/*
448 * Provides a wchan file via kallsyms in a proper one-value-per-file format.
449 * Returns the resolved symbol. If that fails, simply return the address.
450 */
451static int proc_pid_wchan(struct task_struct *task, char *buffer)
452{
453 char *modname;
454 const char *sym_name;
455 unsigned long wchan, size, offset;
456 char namebuf[KSYM_NAME_LEN+1];
457
458 wchan = get_wchan(task);
459
460 sym_name = kallsyms_lookup(wchan, &size, &offset, &modname, namebuf);
461 if (sym_name)
462 return sprintf(buffer, "%s", sym_name);
463 return sprintf(buffer, "%lu", wchan);
464}
465#endif /* CONFIG_KALLSYMS */
466
467#ifdef CONFIG_SCHEDSTATS
468/*
469 * Provides /proc/PID/schedstat
470 */
471static int proc_pid_schedstat(struct task_struct *task, char *buffer)
472{
473 return sprintf(buffer, "%lu %lu %lu\n",
474 task->sched_info.cpu_time,
475 task->sched_info.run_delay,
476 task->sched_info.pcnt);
477}
478#endif
479
480/* The badness from the OOM killer */
481unsigned long badness(struct task_struct *p, unsigned long uptime);
482static int proc_oom_score(struct task_struct *task, char *buffer)
483{
484 unsigned long points;
485 struct timespec uptime;
486
487 do_posix_clock_monotonic_gettime(&uptime);
488 points = badness(task, uptime.tv_sec);
489 return sprintf(buffer, "%lu\n", points);
490}
491
492/************************************************************************/
493/* Here the fs part begins */
494/************************************************************************/
495
496/* permission checks */
497
498static int proc_check_root(struct inode *inode)
499{
500 struct dentry *de, *base, *root;
501 struct vfsmount *our_vfsmnt, *vfsmnt, *mnt;
502 int res = 0;
503
504 if (proc_root_link(inode, &root, &vfsmnt)) /* Ewww... */
505 return -ENOENT;
506 read_lock(&current->fs->lock);
507 our_vfsmnt = mntget(current->fs->rootmnt);
508 base = dget(current->fs->root);
509 read_unlock(&current->fs->lock);
510
511 spin_lock(&vfsmount_lock);
512 de = root;
513 mnt = vfsmnt;
514
515 while (vfsmnt != our_vfsmnt) {
516 if (vfsmnt == vfsmnt->mnt_parent)
517 goto out;
518 de = vfsmnt->mnt_mountpoint;
519 vfsmnt = vfsmnt->mnt_parent;
520 }
521
522 if (!is_subdir(de, base))
523 goto out;
524 spin_unlock(&vfsmount_lock);
525
526exit:
527 dput(base);
528 mntput(our_vfsmnt);
529 dput(root);
530 mntput(mnt);
531 return res;
532out:
533 spin_unlock(&vfsmount_lock);
534 res = -EACCES;
535 goto exit;
536}
537
538static int proc_permission(struct inode *inode, int mask, struct nameidata *nd)
539{
540 if (generic_permission(inode, mask, NULL) != 0)
541 return -EACCES;
542 return proc_check_root(inode);
543}
544
545extern struct seq_operations proc_pid_maps_op;
546static int maps_open(struct inode *inode, struct file *file)
547{
548 struct task_struct *task = proc_task(inode);
549 int ret = seq_open(file, &proc_pid_maps_op);
550 if (!ret) {
551 struct seq_file *m = file->private_data;
552 m->private = task;
553 }
554 return ret;
555}
556
557static struct file_operations proc_maps_operations = {
558 .open = maps_open,
559 .read = seq_read,
560 .llseek = seq_lseek,
561 .release = seq_release,
562};
563
6e21c8f1
CL		 564#ifdef CONFIG_NUMA
565extern struct seq_operations proc_pid_numa_maps_op;
566static int numa_maps_open(struct inode *inode, struct file *file)
567{
568 struct task_struct *task = proc_task(inode);
569 int ret = seq_open(file, &proc_pid_numa_maps_op);
570 if (!ret) {
571 struct seq_file *m = file->private_data;
572 m->private = task;
573 }
574 return ret;
575}
576
577static struct file_operations proc_numa_maps_operations = {
578 .open = numa_maps_open,
579 .read = seq_read,
580 .llseek = seq_lseek,
581 .release = seq_release,
582};
583#endif
584
e070ad49
ML		 585extern struct seq_operations proc_pid_smaps_op;
586static int smaps_open(struct inode *inode, struct file *file)
587{
588 struct task_struct *task = proc_task(inode);
589 int ret = seq_open(file, &proc_pid_smaps_op);
590 if (!ret) {
591 struct seq_file *m = file->private_data;
592 m->private = task;
593 }
594 return ret;
595}
596
597static struct file_operations proc_smaps_operations = {
598 .open = smaps_open,
599 .read = seq_read,
600 .llseek = seq_lseek,
601 .release = seq_release,
602};
603
1da177e4
LT		 604extern struct seq_operations mounts_op;
605static int mounts_open(struct inode *inode, struct file *file)
606{
607 struct task_struct *task = proc_task(inode);
608 int ret = seq_open(file, &mounts_op);
609
610 if (!ret) {
611 struct seq_file *m = file->private_data;
612 struct namespace *namespace;
613 task_lock(task);
614 namespace = task->namespace;
615 if (namespace)
616 get_namespace(namespace);
617 task_unlock(task);
618
619 if (namespace)
620 m->private = namespace;
621 else {
622 seq_release(inode, file);
623 ret = -EINVAL;
624 }
625 }
626 return ret;
627}
628
629static int mounts_release(struct inode *inode, struct file *file)
630{
631 struct seq_file *m = file->private_data;
632 struct namespace *namespace = m->private;
633 put_namespace(namespace);
634 return seq_release(inode, file);
635}
636
637static struct file_operations proc_mounts_operations = {
638 .open = mounts_open,
639 .read = seq_read,
640 .llseek = seq_lseek,
641 .release = mounts_release,
642};
643
644#define PROC_BLOCK_SIZE (3*1024) /* 4K page size but our output routines use some slack for overruns */
645
646static ssize_t proc_info_read(struct file * file, char __user * buf,
647 size_t count, loff_t *ppos)
648{
649 struct inode * inode = file->f_dentry->d_inode;
650 unsigned long page;
651 ssize_t length;
652 struct task_struct *task = proc_task(inode);
653
654 if (count > PROC_BLOCK_SIZE)
655 count = PROC_BLOCK_SIZE;
656 if (!(page = __get_free_page(GFP_KERNEL)))
657 return -ENOMEM;
658
659 length = PROC_I(inode)->op.proc_read(task, (char*)page);
660
661 if (length >= 0)
662 length = simple_read_from_buffer(buf, count, ppos, (char *)page, length);
663 free_page(page);
664 return length;
665}
666
667static struct file_operations proc_info_file_operations = {
668 .read = proc_info_read,
669};
670
671static int mem_open(struct inode* inode, struct file* file)
672{
673 file->private_data = (void*)((long)current->self_exec_id);
674 return 0;
675}
676
677static ssize_t mem_read(struct file * file, char __user * buf,
678 size_t count, loff_t *ppos)
679{
680 struct task_struct *task = proc_task(file->f_dentry->d_inode);
681 char *page;
682 unsigned long src = *ppos;
683 int ret = -ESRCH;
684 struct mm_struct *mm;
685
686 if (!MAY_PTRACE(task) || !may_ptrace_attach(task))
687 goto out;
688
689 ret = -ENOMEM;
690 page = (char *)__get_free_page(GFP_USER);
691 if (!page)
692 goto out;
693
694 ret = 0;
695
696 mm = get_task_mm(task);
697 if (!mm)
698 goto out_free;
699
700 ret = -EIO;
701
702 if (file->private_data != (void*)((long)current->self_exec_id))
703 goto out_put;
704
705 ret = 0;
706
707 while (count > 0) {
708 int this_len, retval;
709
710 this_len = (count > PAGE_SIZE) ? PAGE_SIZE : count;
711 retval = access_process_vm(task, src, page, this_len, 0);
712 if (!retval || !MAY_PTRACE(task) || !may_ptrace_attach(task)) {
713 if (!ret)
714 ret = -EIO;
715 break;
716 }
717
718 if (copy_to_user(buf, page, retval)) {
719 ret = -EFAULT;
720 break;
721 }
722
723 ret += retval;
724 src += retval;
725 buf += retval;
726 count -= retval;
727 }
728 *ppos = src;
729
730out_put:
731 mmput(mm);
732out_free:
733 free_page((unsigned long) page);
734out:
735 return ret;
736}
737
738#define mem_write NULL
739
740#ifndef mem_write
741/* This is a security hazard */
742static ssize_t mem_write(struct file * file, const char * buf,
743 size_t count, loff_t *ppos)
744{
745 int copied = 0;
746 char *page;
747 struct task_struct *task = proc_task(file->f_dentry->d_inode);
748 unsigned long dst = *ppos;
749
750 if (!MAY_PTRACE(task) || !may_ptrace_attach(task))
751 return -ESRCH;
752
753 page = (char *)__get_free_page(GFP_USER);
754 if (!page)
755 return -ENOMEM;
756
757 while (count > 0) {
758 int this_len, retval;
759
760 this_len = (count > PAGE_SIZE) ? PAGE_SIZE : count;
761 if (copy_from_user(page, buf, this_len)) {
762 copied = -EFAULT;
763 break;
764 }
765 retval = access_process_vm(task, dst, page, this_len, 1);
766 if (!retval) {
767 if (!copied)
768 copied = -EIO;
769 break;
770 }
771 copied += retval;
772 buf += retval;
773 dst += retval;
774 count -= retval;
775 }
776 *ppos = dst;
777 free_page((unsigned long) page);
778 return copied;
779}
780#endif
781
782static loff_t mem_lseek(struct file * file, loff_t offset, int orig)
783{
784 switch (orig) {
785 case 0:
786 file->f_pos = offset;
787 break;
788 case 1:
789 file->f_pos += offset;
790 break;
791 default:
792 return -EINVAL;
793 }
794 force_successful_syscall_return();
795 return file->f_pos;
796}
797
798static struct file_operations proc_mem_operations = {
799 .llseek = mem_lseek,
800 .read = mem_read,
801 .write = mem_write,
802 .open = mem_open,
803};
804
805static ssize_t oom_adjust_read(struct file *file, char __user *buf,
806 size_t count, loff_t *ppos)
807{
808 struct task_struct *task = proc_task(file->f_dentry->d_inode);
809 char buffer[8];
810 size_t len;
811 int oom_adjust = task->oomkilladj;
812 loff_t __ppos = *ppos;
813
814 len = sprintf(buffer, "%i\n", oom_adjust);
815 if (__ppos >= len)
816 return 0;
817 if (count > len-__ppos)
818 count = len-__ppos;
819 if (copy_to_user(buf, buffer + __ppos, count))
820 return -EFAULT;
821 *ppos = __ppos + count;
822 return count;
823}
824
825static ssize_t oom_adjust_write(struct file *file, const char __user *buf,
826 size_t count, loff_t *ppos)
827{
828 struct task_struct *task = proc_task(file->f_dentry->d_inode);
829 char buffer[8], *end;
830 int oom_adjust;
831
832 if (!capable(CAP_SYS_RESOURCE))
833 return -EPERM;
834 memset(buffer, 0, 8);
835 if (count > 6)
836 count = 6;
837 if (copy_from_user(buffer, buf, count))
838 return -EFAULT;
839 oom_adjust = simple_strtol(buffer, &end, 0);
79befd0c 840 if ((oom_adjust < -16 || oom_adjust > 15) && oom_adjust != OOM_DISABLE)
1da177e4
LT		 841 return -EINVAL;
842 if (*end == '\n')
843 end++;
844 task->oomkilladj = oom_adjust;
845 if (end - buffer == 0)
846 return -EIO;
847 return end - buffer;
848}
849
850static struct file_operations proc_oom_adjust_operations = {
851 .read = oom_adjust_read,
852 .write = oom_adjust_write,
853};
854
855static struct inode_operations proc_mem_inode_operations = {
856 .permission = proc_permission,
857};
858
859#ifdef CONFIG_AUDITSYSCALL
860#define TMPBUFLEN 21
861static ssize_t proc_loginuid_read(struct file * file, char __user * buf,
862 size_t count, loff_t *ppos)
863{
864 struct inode * inode = file->f_dentry->d_inode;
865 struct task_struct *task = proc_task(inode);
866 ssize_t length;
867 char tmpbuf[TMPBUFLEN];
868
869 length = scnprintf(tmpbuf, TMPBUFLEN, "%u",
870 audit_get_loginuid(task->audit_context));
871 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
872}
873
874static ssize_t proc_loginuid_write(struct file * file, const char __user * buf,
875 size_t count, loff_t *ppos)
876{
877 struct inode * inode = file->f_dentry->d_inode;
878 char *page, *tmp;
879 ssize_t length;
880 struct task_struct *task = proc_task(inode);
881 uid_t loginuid;
882
883 if (!capable(CAP_AUDIT_CONTROL))
884 return -EPERM;
885
886 if (current != task)
887 return -EPERM;
888
889 if (count > PAGE_SIZE)
890 count = PAGE_SIZE;
891
892 if (*ppos != 0) {
893 /* No partial writes. */
894 return -EINVAL;
895 }
896 page = (char*)__get_free_page(GFP_USER);
897 if (!page)
898 return -ENOMEM;
899 length = -EFAULT;
900 if (copy_from_user(page, buf, count))
901 goto out_free_page;
902
903 loginuid = simple_strtoul(page, &tmp, 10);
904 if (tmp == page) {
905 length = -EINVAL;
906 goto out_free_page;
907
908 }
456be6cd 909 length = audit_set_loginuid(task, loginuid);
1da177e4
LT		 910 if (likely(length == 0))
911 length = count;
912
913out_free_page:
914 free_page((unsigned long) page);
915 return length;
916}
917
918static struct file_operations proc_loginuid_operations = {
919 .read = proc_loginuid_read,
920 .write = proc_loginuid_write,
921};
922#endif
923
924#ifdef CONFIG_SECCOMP
925static ssize_t seccomp_read(struct file *file, char __user *buf,
926 size_t count, loff_t *ppos)
927{
928 struct task_struct *tsk = proc_task(file->f_dentry->d_inode);
929 char __buf[20];
930 loff_t __ppos = *ppos;
931 size_t len;
932
933 /* no need to print the trailing zero, so use only len */
934 len = sprintf(__buf, "%u\n", tsk->seccomp.mode);
935 if (__ppos >= len)
936 return 0;
937 if (count > len - __ppos)
938 count = len - __ppos;
939 if (copy_to_user(buf, __buf + __ppos, count))
940 return -EFAULT;
941 *ppos = __ppos + count;
942 return count;
943}
944
945static ssize_t seccomp_write(struct file *file, const char __user *buf,
946 size_t count, loff_t *ppos)
947{
948 struct task_struct *tsk = proc_task(file->f_dentry->d_inode);
949 char __buf[20], *end;
950 unsigned int seccomp_mode;
951
952 /* can set it only once to be even more secure */
953 if (unlikely(tsk->seccomp.mode))
954 return -EPERM;
955
956 memset(__buf, 0, sizeof(__buf));
957 count = min(count, sizeof(__buf) - 1);
958 if (copy_from_user(__buf, buf, count))
959 return -EFAULT;
960 seccomp_mode = simple_strtoul(__buf, &end, 0);
961 if (*end == '\n')
962 end++;
963 if (seccomp_mode && seccomp_mode <= NR_SECCOMP_MODES) {
964 tsk->seccomp.mode = seccomp_mode;
965 set_tsk_thread_flag(tsk, TIF_SECCOMP);
966 } else
967 return -EINVAL;
968 if (unlikely(!(end - __buf)))
969 return -EIO;
970 return end - __buf;
971}
972
973static struct file_operations proc_seccomp_operations = {
974 .read = seccomp_read,
975 .write = seccomp_write,
976};
977#endif /* CONFIG_SECCOMP */
978
008b150a 979static void *proc_pid_follow_link(struct dentry *dentry, struct nameidata *nd)
1da177e4
LT		 980{
981 struct inode *inode = dentry->d_inode;
982 int error = -EACCES;
983
984 /* We don't need a base pointer in the /proc filesystem */
985 path_release(nd);
986
987 if (current->fsuid != inode->i_uid && !capable(CAP_DAC_OVERRIDE))
988 goto out;
989 error = proc_check_root(inode);
990 if (error)
991 goto out;
992
993 error = PROC_I(inode)->op.proc_get_link(inode, &nd->dentry, &nd->mnt);
994 nd->last_type = LAST_BIND;
995out:
008b150a 996 return ERR_PTR(error);
1da177e4
LT		 997}
998
999static int do_proc_readlink(struct dentry *dentry, struct vfsmount *mnt,
1000 char __user *buffer, int buflen)
1001{
1002 struct inode * inode;
1003 char *tmp = (char*)__get_free_page(GFP_KERNEL), *path;
1004 int len;
1005
1006 if (!tmp)
1007 return -ENOMEM;
1008
1009 inode = dentry->d_inode;
1010 path = d_path(dentry, mnt, tmp, PAGE_SIZE);
1011 len = PTR_ERR(path);
1012 if (IS_ERR(path))
1013 goto out;
1014 len = tmp + PAGE_SIZE - 1 - path;
1015
1016 if (len > buflen)
1017 len = buflen;
1018 if (copy_to_user(buffer, path, len))
1019 len = -EFAULT;
1020 out:
1021 free_page((unsigned long)tmp);
1022 return len;
1023}
1024
1025static int proc_pid_readlink(struct dentry * dentry, char __user * buffer, int buflen)
1026{
1027 int error = -EACCES;
1028 struct inode *inode = dentry->d_inode;
1029 struct dentry *de;
1030 struct vfsmount *mnt = NULL;
1031
1032 lock_kernel();
1033
1034 if (current->fsuid != inode->i_uid && !capable(CAP_DAC_OVERRIDE))
1035 goto out;
1036 error = proc_check_root(inode);
1037 if (error)
1038 goto out;
1039
1040 error = PROC_I(inode)->op.proc_get_link(inode, &de, &mnt);
1041 if (error)
1042 goto out;
1043
1044 error = do_proc_readlink(de, mnt, buffer, buflen);
1045 dput(de);
1046 mntput(mnt);
1047out:
1048 unlock_kernel();
1049 return error;
1050}
1051
1052static struct inode_operations proc_pid_link_inode_operations = {
1053 .readlink = proc_pid_readlink,
1054 .follow_link = proc_pid_follow_link
1055};
1056
1057#define NUMBUF 10
1058
1059static int proc_readfd(struct file * filp, void * dirent, filldir_t filldir)
1060{
1061 struct inode *inode = filp->f_dentry->d_inode;
1062 struct task_struct *p = proc_task(inode);
1063 unsigned int fd, tid, ino;
1064 int retval;
1065 char buf[NUMBUF];
1066 struct files_struct * files;
1067
1068 retval = -ENOENT;
1069 if (!pid_alive(p))
1070 goto out;
1071 retval = 0;
1072 tid = p->pid;
1073
1074 fd = filp->f_pos;
1075 switch (fd) {
1076 case 0:
1077 if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0)
1078 goto out;
1079 filp->f_pos++;
1080 case 1:
1081 ino = fake_ino(tid, PROC_TID_INO);
1082 if (filldir(dirent, "..", 2, 1, ino, DT_DIR) < 0)
1083 goto out;
1084 filp->f_pos++;
1085 default:
1086 files = get_files_struct(p);
1087 if (!files)
1088 goto out;
1089 spin_lock(&files->file_lock);
1090 for (fd = filp->f_pos-2;
1091 fd < files->max_fds;
1092 fd++, filp->f_pos++) {
1093 unsigned int i,j;
1094
1095 if (!fcheck_files(files, fd))
1096 continue;
1097 spin_unlock(&files->file_lock);
1098
1099 j = NUMBUF;
1100 i = fd;
1101 do {
1102 j--;
1103 buf[j] = '0' + (i % 10);
1104 i /= 10;
1105 } while (i);
1106
1107 ino = fake_ino(tid, PROC_TID_FD_DIR + fd);
1108 if (filldir(dirent, buf+j, NUMBUF-j, fd+2, ino, DT_LNK) < 0) {
1109 spin_lock(&files->file_lock);
1110 break;
1111 }
1112 spin_lock(&files->file_lock);
1113 }
1114 spin_unlock(&files->file_lock);
1115 put_files_struct(files);
1116 }
1117out:
1118 return retval;
1119}
1120
1121static int proc_pident_readdir(struct file *filp,
1122 void *dirent, filldir_t filldir,
1123 struct pid_entry *ents, unsigned int nents)
1124{
1125 int i;
1126 int pid;
1127 struct dentry *dentry = filp->f_dentry;
1128 struct inode *inode = dentry->d_inode;
1129 struct pid_entry *p;
1130 ino_t ino;
1131 int ret;
1132
1133 ret = -ENOENT;
1134 if (!pid_alive(proc_task(inode)))
1135 goto out;
1136
1137 ret = 0;
1138 pid = proc_task(inode)->pid;
1139 i = filp->f_pos;
1140 switch (i) {
1141 case 0:
1142 ino = inode->i_ino;
1143 if (filldir(dirent, ".", 1, i, ino, DT_DIR) < 0)
1144 goto out;
1145 i++;
1146 filp->f_pos++;
1147 /* fall through */
1148 case 1:
1149 ino = parent_ino(dentry);
1150 if (filldir(dirent, "..", 2, i, ino, DT_DIR) < 0)
1151 goto out;
1152 i++;
1153 filp->f_pos++;
1154 /* fall through */
1155 default:
1156 i -= 2;
1157 if (i >= nents) {
1158 ret = 1;
1159 goto out;
1160 }
1161 p = ents + i;
1162 while (p->name) {
1163 if (filldir(dirent, p->name, p->len, filp->f_pos,
1164 fake_ino(pid, p->type), p->mode >> 12) < 0)
1165 goto out;
1166 filp->f_pos++;
1167 p++;
1168 }
1169 }
1170
1171 ret = 1;
1172out:
1173 return ret;
1174}
1175
1176static int proc_tgid_base_readdir(struct file * filp,
1177 void * dirent, filldir_t filldir)
1178{
1179 return proc_pident_readdir(filp,dirent,filldir,
1180 tgid_base_stuff,ARRAY_SIZE(tgid_base_stuff));
1181}
1182
1183static int proc_tid_base_readdir(struct file * filp,
1184 void * dirent, filldir_t filldir)
1185{
1186 return proc_pident_readdir(filp,dirent,filldir,
1187 tid_base_stuff,ARRAY_SIZE(tid_base_stuff));
1188}
1189
1190/* building an inode */
1191
1192static int task_dumpable(struct task_struct *task)
1193{
1194 int dumpable = 0;
1195 struct mm_struct *mm;
1196
1197 task_lock(task);
1198 mm = task->mm;
1199 if (mm)
1200 dumpable = mm->dumpable;
1201 task_unlock(task);
d6e71144
AC		 1202 if(dumpable == 1)
1203 return 1;
1204 return 0;
1da177e4
LT		 1205}
1206
1207
1208static struct inode *proc_pid_make_inode(struct super_block * sb, struct task_struct *task, int ino)
1209{
1210 struct inode * inode;
1211 struct proc_inode *ei;
1212
1213 /* We need a new inode */
1214
1215 inode = new_inode(sb);
1216 if (!inode)
1217 goto out;
1218
1219 /* Common stuff */
1220 ei = PROC_I(inode);
1221 ei->task = NULL;
1222 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
1223 inode->i_ino = fake_ino(task->pid, ino);
1224
1225 if (!pid_alive(task))
1226 goto out_unlock;
1227
1228 /*
1229 * grab the reference to task.
1230 */
1231 get_task_struct(task);
1232 ei->task = task;
1233 ei->type = ino;
1234 inode->i_uid = 0;
1235 inode->i_gid = 0;
1236 if (ino == PROC_TGID_INO || ino == PROC_TID_INO || task_dumpable(task)) {
1237 inode->i_uid = task->euid;
1238 inode->i_gid = task->egid;
1239 }
1240 security_task_to_inode(task, inode);
1241
1242out:
1243 return inode;
1244
1245out_unlock:
1246 ei->pde = NULL;
1247 iput(inode);
1248 return NULL;
1249}
1250
1251/* dentry stuff */
1252
1253/*
1254 * Exceptional case: normally we are not allowed to unhash a busy
1255 * directory. In this case, however, we can do it - no aliasing problems
1256 * due to the way we treat inodes.
1257 *
1258 * Rewrite the inode's ownerships here because the owning task may have
1259 * performed a setuid(), etc.
1260 */
1261static int pid_revalidate(struct dentry *dentry, struct nameidata *nd)
1262{
1263 struct inode *inode = dentry->d_inode;
1264 struct task_struct *task = proc_task(inode);
1265 if (pid_alive(task)) {
1266 if (proc_type(inode) == PROC_TGID_INO || proc_type(inode) == PROC_TID_INO || task_dumpable(task)) {
1267 inode->i_uid = task->euid;
1268 inode->i_gid = task->egid;
1269 } else {
1270 inode->i_uid = 0;
1271 inode->i_gid = 0;
1272 }
1273 security_task_to_inode(task, inode);
1274 return 1;
1275 }
1276 d_drop(dentry);
1277 return 0;
1278}
1279
1280static int tid_fd_revalidate(struct dentry *dentry, struct nameidata *nd)
1281{
1282 struct inode *inode = dentry->d_inode;
1283 struct task_struct *task = proc_task(inode);
1284 int fd = proc_type(inode) - PROC_TID_FD_DIR;
1285 struct files_struct *files;
1286
1287 files = get_files_struct(task);
1288 if (files) {
1289 spin_lock(&files->file_lock);
1290 if (fcheck_files(files, fd)) {
1291 spin_unlock(&files->file_lock);
1292 put_files_struct(files);
1293 if (task_dumpable(task)) {
1294 inode->i_uid = task->euid;
1295 inode->i_gid = task->egid;
1296 } else {
1297 inode->i_uid = 0;
1298 inode->i_gid = 0;
1299 }
1300 security_task_to_inode(task, inode);
1301 return 1;
1302 }
1303 spin_unlock(&files->file_lock);
1304 put_files_struct(files);
1305 }
1306 d_drop(dentry);
1307 return 0;
1308}
1309
1310static void pid_base_iput(struct dentry *dentry, struct inode *inode)
1311{
1312 struct task_struct *task = proc_task(inode);
1313 spin_lock(&task->proc_lock);
1314 if (task->proc_dentry == dentry)
1315 task->proc_dentry = NULL;
1316 spin_unlock(&task->proc_lock);
1317 iput(inode);
1318}
1319
1320static int pid_delete_dentry(struct dentry * dentry)
1321{
1322 /* Is the task we represent dead?
1323 * If so, then don't put the dentry on the lru list,
1324 * kill it immediately.
1325 */
1326 return !pid_alive(proc_task(dentry->d_inode));
1327}
1328
1329static struct dentry_operations tid_fd_dentry_operations =
1330{
1331 .d_revalidate = tid_fd_revalidate,
1332 .d_delete = pid_delete_dentry,
1333};
1334
1335static struct dentry_operations pid_dentry_operations =
1336{
1337 .d_revalidate = pid_revalidate,
1338 .d_delete = pid_delete_dentry,
1339};
1340
1341static struct dentry_operations pid_base_dentry_operations =
1342{
1343 .d_revalidate = pid_revalidate,
1344 .d_iput = pid_base_iput,
1345 .d_delete = pid_delete_dentry,
1346};
1347
1348/* Lookups */
1349
1350static unsigned name_to_int(struct dentry *dentry)
1351{
1352 const char *name = dentry->d_name.name;
1353 int len = dentry->d_name.len;
1354 unsigned n = 0;
1355
1356 if (len > 1 && *name == '0')
1357 goto out;
1358 while (len-- > 0) {
1359 unsigned c = *name++ - '0';
1360 if (c > 9)
1361 goto out;
1362 if (n >= (~0U-9)/10)
1363 goto out;
1364 n *= 10;
1365 n += c;
1366 }
1367 return n;
1368out:
1369 return ~0U;
1370}
1371
1372/* SMP-safe */
1373static struct dentry *proc_lookupfd(struct inode * dir, struct dentry * dentry, struct nameidata *nd)
1374{
1375 struct task_struct *task = proc_task(dir);
1376 unsigned fd = name_to_int(dentry);
1377 struct file * file;
1378 struct files_struct * files;
1379 struct inode *inode;
1380 struct proc_inode *ei;
1381
1382 if (fd == ~0U)
1383 goto out;
1384 if (!pid_alive(task))
1385 goto out;
1386
1387 inode = proc_pid_make_inode(dir->i_sb, task, PROC_TID_FD_DIR+fd);
1388 if (!inode)
1389 goto out;
1390 ei = PROC_I(inode);
1391 files = get_files_struct(task);
1392 if (!files)
1393 goto out_unlock;
1394 inode->i_mode = S_IFLNK;
1395 spin_lock(&files->file_lock);
1396 file = fcheck_files(files, fd);
1397 if (!file)
1398 goto out_unlock2;
1399 if (file->f_mode & 1)
1400 inode->i_mode |= S_IRUSR | S_IXUSR;
1401 if (file->f_mode & 2)
1402 inode->i_mode |= S_IWUSR | S_IXUSR;
1403 spin_unlock(&files->file_lock);
1404 put_files_struct(files);
1405 inode->i_op = &proc_pid_link_inode_operations;
1406 inode->i_size = 64;
1407 ei->op.proc_get_link = proc_fd_link;
1408 dentry->d_op = &tid_fd_dentry_operations;
1409 d_add(dentry, inode);
1410 return NULL;
1411
1412out_unlock2:
1413 spin_unlock(&files->file_lock);
1414 put_files_struct(files);
1415out_unlock:
1416 iput(inode);
1417out:
1418 return ERR_PTR(-ENOENT);
1419}
1420
1421static int proc_task_readdir(struct file * filp, void * dirent, filldir_t filldir);
1422static struct dentry *proc_task_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd);
1423
1424static struct file_operations proc_fd_operations = {
1425 .read = generic_read_dir,
1426 .readdir = proc_readfd,
1427};
1428
1429static struct file_operations proc_task_operations = {
1430 .read = generic_read_dir,
1431 .readdir = proc_task_readdir,
1432};
1433
1434/*
1435 * proc directories can do almost nothing..
1436 */
1437static struct inode_operations proc_fd_inode_operations = {
1438 .lookup = proc_lookupfd,
1439 .permission = proc_permission,
1440};
1441
1442static struct inode_operations proc_task_inode_operations = {
1443 .lookup = proc_task_lookup,
1444 .permission = proc_permission,
1445};
1446
1447#ifdef CONFIG_SECURITY
1448static ssize_t proc_pid_attr_read(struct file * file, char __user * buf,
1449 size_t count, loff_t *ppos)
1450{
1451 struct inode * inode = file->f_dentry->d_inode;
1452 unsigned long page;
1453 ssize_t length;
1454 struct task_struct *task = proc_task(inode);
1455
1456 if (count > PAGE_SIZE)
1457 count = PAGE_SIZE;
1458 if (!(page = __get_free_page(GFP_KERNEL)))
1459 return -ENOMEM;
1460
1461 length = security_getprocattr(task,
1462 (char*)file->f_dentry->d_name.name,
1463 (void*)page, count);
1464 if (length >= 0)
1465 length = simple_read_from_buffer(buf, count, ppos, (char *)page, length);
1466 free_page(page);
1467 return length;
1468}
1469
1470static ssize_t proc_pid_attr_write(struct file * file, const char __user * buf,
1471 size_t count, loff_t *ppos)
1472{
1473 struct inode * inode = file->f_dentry->d_inode;
1474 char *page;
1475 ssize_t length;
1476 struct task_struct *task = proc_task(inode);
1477
1478 if (count > PAGE_SIZE)
1479 count = PAGE_SIZE;
1480 if (*ppos != 0) {
1481 /* No partial writes. */
1482 return -EINVAL;
1483 }
1484 page = (char*)__get_free_page(GFP_USER);
1485 if (!page)
1486 return -ENOMEM;
1487 length = -EFAULT;
1488 if (copy_from_user(page, buf, count))
1489 goto out;
1490
1491 length = security_setprocattr(task,
1492 (char*)file->f_dentry->d_name.name,
1493 (void*)page, count);
1494out:
1495 free_page((unsigned long) page);
1496 return length;
1497}
1498
1499static struct file_operations proc_pid_attr_operations = {
1500 .read = proc_pid_attr_read,
1501 .write = proc_pid_attr_write,
1502};
1503
1504static struct file_operations proc_tid_attr_operations;
1505static struct inode_operations proc_tid_attr_inode_operations;
1506static struct file_operations proc_tgid_attr_operations;
1507static struct inode_operations proc_tgid_attr_inode_operations;
1508#endif
1509
f246315e
DD		 1510static int get_tid_list(int index, unsigned int *tids, struct inode *dir);
1511
1da177e4
LT		 1512/* SMP-safe */
1513static struct dentry *proc_pident_lookup(struct inode *dir,
1514 struct dentry *dentry,
1515 struct pid_entry *ents)
1516{
1517 struct inode *inode;
1518 int error;
1519 struct task_struct *task = proc_task(dir);
1520 struct pid_entry *p;
1521 struct proc_inode *ei;
1522
1523 error = -ENOENT;
1524 inode = NULL;
1525
1526 if (!pid_alive(task))
1527 goto out;
1528
1529 for (p = ents; p->name; p++) {
1530 if (p->len != dentry->d_name.len)
1531 continue;
1532 if (!memcmp(dentry->d_name.name, p->name, p->len))
1533 break;
1534 }
1535 if (!p->name)
1536 goto out;
1537
1538 error = -EINVAL;
1539 inode = proc_pid_make_inode(dir->i_sb, task, p->type);
1540 if (!inode)
1541 goto out;
1542
1543 ei = PROC_I(inode);
1544 inode->i_mode = p->mode;
1545 /*
1546 * Yes, it does not scale. And it should not. Don't add
1547 * new entries into /proc/<tgid>/ without very good reasons.
1548 */
1549 switch(p->type) {
1550 case PROC_TGID_TASK:
f246315e 1551 inode->i_nlink = 2 + get_tid_list(2, NULL, dir);
1da177e4
LT		 1552 inode->i_op = &proc_task_inode_operations;
1553 inode->i_fop = &proc_task_operations;
1554 break;
1555 case PROC_TID_FD:
1556 case PROC_TGID_FD:
1557 inode->i_nlink = 2;
1558 inode->i_op = &proc_fd_inode_operations;
1559 inode->i_fop = &proc_fd_operations;
1560 break;
1561 case PROC_TID_EXE:
1562 case PROC_TGID_EXE:
1563 inode->i_op = &proc_pid_link_inode_operations;
1564 ei->op.proc_get_link = proc_exe_link;
1565 break;
1566 case PROC_TID_CWD:
1567 case PROC_TGID_CWD:
1568 inode->i_op = &proc_pid_link_inode_operations;
1569 ei->op.proc_get_link = proc_cwd_link;
1570 break;
1571 case PROC_TID_ROOT:
1572 case PROC_TGID_ROOT:
1573 inode->i_op = &proc_pid_link_inode_operations;
1574 ei->op.proc_get_link = proc_root_link;
1575 break;
1576 case PROC_TID_ENVIRON:
1577 case PROC_TGID_ENVIRON:
1578 inode->i_fop = &proc_info_file_operations;
1579 ei->op.proc_read = proc_pid_environ;
1580 break;
1581 case PROC_TID_AUXV:
1582 case PROC_TGID_AUXV:
1583 inode->i_fop = &proc_info_file_operations;
1584 ei->op.proc_read = proc_pid_auxv;
1585 break;
1586 case PROC_TID_STATUS:
1587 case PROC_TGID_STATUS:
1588 inode->i_fop = &proc_info_file_operations;
1589 ei->op.proc_read = proc_pid_status;
1590 break;
1591 case PROC_TID_STAT:
1592 inode->i_fop = &proc_info_file_operations;
1593 ei->op.proc_read = proc_tid_stat;
1594 break;
1595 case PROC_TGID_STAT:
1596 inode->i_fop = &proc_info_file_operations;
1597 ei->op.proc_read = proc_tgid_stat;
1598 break;
1599 case PROC_TID_CMDLINE:
1600 case PROC_TGID_CMDLINE:
1601 inode->i_fop = &proc_info_file_operations;
1602 ei->op.proc_read = proc_pid_cmdline;
1603 break;
1604 case PROC_TID_STATM:
1605 case PROC_TGID_STATM:
1606 inode->i_fop = &proc_info_file_operations;
1607 ei->op.proc_read = proc_pid_statm;
1608 break;
1609 case PROC_TID_MAPS:
1610 case PROC_TGID_MAPS:
1611 inode->i_fop = &proc_maps_operations;
1612 break;
6e21c8f1
CL		 1613#ifdef CONFIG_NUMA
1614 case PROC_TID_NUMA_MAPS:
1615 case PROC_TGID_NUMA_MAPS:
1616 inode->i_fop = &proc_numa_maps_operations;
1617 break;
1618#endif
1da177e4
LT		 1619 case PROC_TID_MEM:
1620 case PROC_TGID_MEM:
1621 inode->i_op = &proc_mem_inode_operations;
1622 inode->i_fop = &proc_mem_operations;
1623 break;
1624#ifdef CONFIG_SECCOMP
1625 case PROC_TID_SECCOMP:
1626 case PROC_TGID_SECCOMP:
1627 inode->i_fop = &proc_seccomp_operations;
1628 break;
1629#endif /* CONFIG_SECCOMP */
1630 case PROC_TID_MOUNTS:
1631 case PROC_TGID_MOUNTS:
1632 inode->i_fop = &proc_mounts_operations;
1633 break;
e070ad49
ML		 1634 case PROC_TID_SMAPS:
1635 case PROC_TGID_SMAPS:
1636 inode->i_fop = &proc_smaps_operations;
1637 break;
1da177e4
LT		 1638#ifdef CONFIG_SECURITY
1639 case PROC_TID_ATTR:
1640 inode->i_nlink = 2;
1641 inode->i_op = &proc_tid_attr_inode_operations;
1642 inode->i_fop = &proc_tid_attr_operations;
1643 break;
1644 case PROC_TGID_ATTR:
1645 inode->i_nlink = 2;
1646 inode->i_op = &proc_tgid_attr_inode_operations;
1647 inode->i_fop = &proc_tgid_attr_operations;
1648 break;
1649 case PROC_TID_ATTR_CURRENT:
1650 case PROC_TGID_ATTR_CURRENT:
1651 case PROC_TID_ATTR_PREV:
1652 case PROC_TGID_ATTR_PREV:
1653 case PROC_TID_ATTR_EXEC:
1654 case PROC_TGID_ATTR_EXEC:
1655 case PROC_TID_ATTR_FSCREATE:
1656 case PROC_TGID_ATTR_FSCREATE:
1657 inode->i_fop = &proc_pid_attr_operations;
1658 break;
1659#endif
1660#ifdef CONFIG_KALLSYMS
1661 case PROC_TID_WCHAN:
1662 case PROC_TGID_WCHAN:
1663 inode->i_fop = &proc_info_file_operations;
1664 ei->op.proc_read = proc_pid_wchan;
1665 break;
1666#endif
1667#ifdef CONFIG_SCHEDSTATS
1668 case PROC_TID_SCHEDSTAT:
1669 case PROC_TGID_SCHEDSTAT:
1670 inode->i_fop = &proc_info_file_operations;
1671 ei->op.proc_read = proc_pid_schedstat;
1672 break;
1673#endif
1674#ifdef CONFIG_CPUSETS
1675 case PROC_TID_CPUSET:
1676 case PROC_TGID_CPUSET:
1677 inode->i_fop = &proc_cpuset_operations;
1678 break;
1679#endif
1680 case PROC_TID_OOM_SCORE:
1681 case PROC_TGID_OOM_SCORE:
1682 inode->i_fop = &proc_info_file_operations;
1683 ei->op.proc_read = proc_oom_score;
1684 break;
1685 case PROC_TID_OOM_ADJUST:
1686 case PROC_TGID_OOM_ADJUST:
1687 inode->i_fop = &proc_oom_adjust_operations;
1688 break;
1689#ifdef CONFIG_AUDITSYSCALL
1690 case PROC_TID_LOGINUID:
1691 case PROC_TGID_LOGINUID:
1692 inode->i_fop = &proc_loginuid_operations;
1693 break;
1694#endif
1695 default:
1696 printk("procfs: impossible type (%d)",p->type);
1697 iput(inode);
1698 return ERR_PTR(-EINVAL);
1699 }
1700 dentry->d_op = &pid_dentry_operations;
1701 d_add(dentry, inode);
1702 return NULL;
1703
1704out:
1705 return ERR_PTR(error);
1706}
1707
1708static struct dentry *proc_tgid_base_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd){
1709 return proc_pident_lookup(dir, dentry, tgid_base_stuff);
1710}
1711
1712static struct dentry *proc_tid_base_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd){
1713 return proc_pident_lookup(dir, dentry, tid_base_stuff);
1714}
1715
1716static struct file_operations proc_tgid_base_operations = {
1717 .read = generic_read_dir,
1718 .readdir = proc_tgid_base_readdir,
1719};
1720
1721static struct file_operations proc_tid_base_operations = {
1722 .read = generic_read_dir,
1723 .readdir = proc_tid_base_readdir,
1724};
1725
1726static struct inode_operations proc_tgid_base_inode_operations = {
1727 .lookup = proc_tgid_base_lookup,
1728};
1729
1730static struct inode_operations proc_tid_base_inode_operations = {
1731 .lookup = proc_tid_base_lookup,
1732};
1733
1734#ifdef CONFIG_SECURITY
1735static int proc_tgid_attr_readdir(struct file * filp,
1736 void * dirent, filldir_t filldir)
1737{
1738 return proc_pident_readdir(filp,dirent,filldir,
1739 tgid_attr_stuff,ARRAY_SIZE(tgid_attr_stuff));
1740}
1741
1742static int proc_tid_attr_readdir(struct file * filp,
1743 void * dirent, filldir_t filldir)
1744{
1745 return proc_pident_readdir(filp,dirent,filldir,
1746 tid_attr_stuff,ARRAY_SIZE(tid_attr_stuff));
1747}
1748
1749static struct file_operations proc_tgid_attr_operations = {
1750 .read = generic_read_dir,
1751 .readdir = proc_tgid_attr_readdir,
1752};
1753
1754static struct file_operations proc_tid_attr_operations = {
1755 .read = generic_read_dir,
1756 .readdir = proc_tid_attr_readdir,
1757};
1758
1759static struct dentry *proc_tgid_attr_lookup(struct inode *dir,
1760 struct dentry *dentry, struct nameidata *nd)
1761{
1762 return proc_pident_lookup(dir, dentry, tgid_attr_stuff);
1763}
1764
1765static struct dentry *proc_tid_attr_lookup(struct inode *dir,
1766 struct dentry *dentry, struct nameidata *nd)
1767{
1768 return proc_pident_lookup(dir, dentry, tid_attr_stuff);
1769}
1770
1771static struct inode_operations proc_tgid_attr_inode_operations = {
1772 .lookup = proc_tgid_attr_lookup,
1773};
1774
1775static struct inode_operations proc_tid_attr_inode_operations = {
1776 .lookup = proc_tid_attr_lookup,
1777};
1778#endif
1779
1780/*
1781 * /proc/self:
1782 */
1783static int proc_self_readlink(struct dentry *dentry, char __user *buffer,
1784 int buflen)
1785{
1786 char tmp[30];
1787 sprintf(tmp, "%d", current->tgid);
1788 return vfs_readlink(dentry,buffer,buflen,tmp);
1789}
1790
008b150a 1791static void *proc_self_follow_link(struct dentry *dentry, struct nameidata *nd)
1da177e4
LT		 1792{
1793 char tmp[30];
1794 sprintf(tmp, "%d", current->tgid);
008b150a 1795 return ERR_PTR(vfs_follow_link(nd,tmp));
1da177e4
LT		 1796}
1797
1798static struct inode_operations proc_self_inode_operations = {
1799 .readlink = proc_self_readlink,
1800 .follow_link = proc_self_follow_link,
1801};
1802
1803/**
4dc3b16b 1804 * proc_pid_unhash - Unhash /proc/@pid entry from the dcache.
1da177e4
LT		 1805 * @p: task that should be flushed.
1806 *
4dc3b16b 1807 * Drops the /proc/@pid dcache entry from the hash chains.
1da177e4 1808 *
4dc3b16b
PP		 1809 * Dropping /proc/@pid entries and detach_pid must be synchroneous,
1810 * otherwise e.g. /proc/@pid/exe might point to the wrong executable,
1da177e4
LT		 1811 * if the pid value is immediately reused. This is enforced by
1812 * - caller must acquire spin_lock(p->proc_lock)
1813 * - must be called before detach_pid()
1814 * - proc_pid_lookup acquires proc_lock, and checks that
1815 * the target is not dead by looking at the attach count
1816 * of PIDTYPE_PID.
1817 */
1818
1819struct dentry *proc_pid_unhash(struct task_struct *p)
1820{
1821 struct dentry *proc_dentry;
1822
1823 proc_dentry = p->proc_dentry;
1824 if (proc_dentry != NULL) {
1825
1826 spin_lock(&dcache_lock);
1827 spin_lock(&proc_dentry->d_lock);
1828 if (!d_unhashed(proc_dentry)) {
1829 dget_locked(proc_dentry);
1830 __d_drop(proc_dentry);
1831 spin_unlock(&proc_dentry->d_lock);
1832 } else {
1833 spin_unlock(&proc_dentry->d_lock);
1834 proc_dentry = NULL;
1835 }
1836 spin_unlock(&dcache_lock);
1837 }
1838 return proc_dentry;
1839}
1840
1841/**
4dc3b16b 1842 * proc_pid_flush - recover memory used by stale /proc/@pid/x entries
67be2dd1 1843 * @proc_dentry: directoy to prune.
1da177e4
LT		 1844 *
1845 * Shrink the /proc directory that was used by the just killed thread.
1846 */
1847
1848void proc_pid_flush(struct dentry *proc_dentry)
1849{
1850 might_sleep();
1851 if(proc_dentry != NULL) {
1852 shrink_dcache_parent(proc_dentry);
1853 dput(proc_dentry);
1854 }
1855}
1856
1857/* SMP-safe */
1858struct dentry *proc_pid_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd)
1859{
1860 struct task_struct *task;
1861 struct inode *inode;
1862 struct proc_inode *ei;
1863 unsigned tgid;
1864 int died;
1865
1866 if (dentry->d_name.len == 4 && !memcmp(dentry->d_name.name,"self",4)) {
1867 inode = new_inode(dir->i_sb);
1868 if (!inode)
1869 return ERR_PTR(-ENOMEM);
1870 ei = PROC_I(inode);
1871 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
1872 inode->i_ino = fake_ino(0, PROC_TGID_INO);
1873 ei->pde = NULL;
1874 inode->i_mode = S_IFLNK|S_IRWXUGO;
1875 inode->i_uid = inode->i_gid = 0;
1876 inode->i_size = 64;
1877 inode->i_op = &proc_self_inode_operations;
1878 d_add(dentry, inode);
1879 return NULL;
1880 }
1881 tgid = name_to_int(dentry);
1882 if (tgid == ~0U)
1883 goto out;
1884
1885 read_lock(&tasklist_lock);
1886 task = find_task_by_pid(tgid);
1887 if (task)
1888 get_task_struct(task);
1889 read_unlock(&tasklist_lock);
1890 if (!task)
1891 goto out;
1892
1893 inode = proc_pid_make_inode(dir->i_sb, task, PROC_TGID_INO);
1894
1895
1896 if (!inode) {
1897 put_task_struct(task);
1898 goto out;
1899 }
1900 inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO;
1901 inode->i_op = &proc_tgid_base_inode_operations;
1902 inode->i_fop = &proc_tgid_base_operations;
1da177e4 1903 inode->i_flags|=S_IMMUTABLE;
bcf88e11
DD		 1904#ifdef CONFIG_SECURITY
1905 inode->i_nlink = 5;
1906#else
1907 inode->i_nlink = 4;
1908#endif
1da177e4
LT		 1909
1910 dentry->d_op = &pid_base_dentry_operations;
1911
1912 died = 0;
1913 d_add(dentry, inode);
1914 spin_lock(&task->proc_lock);
1915 task->proc_dentry = dentry;
1916 if (!pid_alive(task)) {
1917 dentry = proc_pid_unhash(task);
1918 died = 1;
1919 }
1920 spin_unlock(&task->proc_lock);
1921
1922 put_task_struct(task);
1923 if (died) {
1924 proc_pid_flush(dentry);
1925 goto out;
1926 }
1927 return NULL;
1928out:
1929 return ERR_PTR(-ENOENT);
1930}
1931
1932/* SMP-safe */
1933static struct dentry *proc_task_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd)
1934{
1935 struct task_struct *task;
1936 struct task_struct *leader = proc_task(dir);
1937 struct inode *inode;
1938 unsigned tid;
1939
1940 tid = name_to_int(dentry);
1941 if (tid == ~0U)
1942 goto out;
1943
1944 read_lock(&tasklist_lock);
1945 task = find_task_by_pid(tid);
1946 if (task)
1947 get_task_struct(task);
1948 read_unlock(&tasklist_lock);
1949 if (!task)
1950 goto out;
1951 if (leader->tgid != task->tgid)
1952 goto out_drop_task;
1953
1954 inode = proc_pid_make_inode(dir->i_sb, task, PROC_TID_INO);
1955
1956
1957 if (!inode)
1958 goto out_drop_task;
1959 inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO;
1960 inode->i_op = &proc_tid_base_inode_operations;
1961 inode->i_fop = &proc_tid_base_operations;
1da177e4 1962 inode->i_flags|=S_IMMUTABLE;
bcf88e11
DD		 1963#ifdef CONFIG_SECURITY
1964 inode->i_nlink = 4;
1965#else
1966 inode->i_nlink = 3;
1967#endif
1da177e4
LT		 1968
1969 dentry->d_op = &pid_base_dentry_operations;
1970
1971 d_add(dentry, inode);
1972
1973 put_task_struct(task);
1974 return NULL;
1975out_drop_task:
1976 put_task_struct(task);
1977out:
1978 return ERR_PTR(-ENOENT);
1979}
1980
1981#define PROC_NUMBUF 10
1982#define PROC_MAXPIDS 20
1983
1984/*
1985 * Get a few tgid's to return for filldir - we need to hold the
1986 * tasklist lock while doing this, and we must release it before
1987 * we actually do the filldir itself, so we use a temp buffer..
1988 */
1989static int get_tgid_list(int index, unsigned long version, unsigned int *tgids)
1990{
1991 struct task_struct *p;
1992 int nr_tgids = 0;
1993
1994 index--;
1995 read_lock(&tasklist_lock);
1996 p = NULL;
1997 if (version) {
1998 p = find_task_by_pid(version);
1999 if (p && !thread_group_leader(p))
2000 p = NULL;
2001 }
2002
2003 if (p)
2004 index = 0;
2005 else
2006 p = next_task(&init_task);
2007
2008 for ( ; p != &init_task; p = next_task(p)) {
2009 int tgid = p->pid;
2010 if (!pid_alive(p))
2011 continue;
2012 if (--index >= 0)
2013 continue;
2014 tgids[nr_tgids] = tgid;
2015 nr_tgids++;
2016 if (nr_tgids >= PROC_MAXPIDS)
2017 break;
2018 }
2019 read_unlock(&tasklist_lock);
2020 return nr_tgids;
2021}
2022
2023/*
2024 * Get a few tid's to return for filldir - we need to hold the
2025 * tasklist lock while doing this, and we must release it before
2026 * we actually do the filldir itself, so we use a temp buffer..
2027 */
2028static int get_tid_list(int index, unsigned int *tids, struct inode *dir)
2029{
2030 struct task_struct *leader_task = proc_task(dir);
2031 struct task_struct *task = leader_task;
2032 int nr_tids = 0;
2033
2034 index -= 2;
2035 read_lock(&tasklist_lock);
2036 /*
2037 * The starting point task (leader_task) might be an already
2038 * unlinked task, which cannot be used to access the task-list
2039 * via next_thread().
2040 */
2041 if (pid_alive(task)) do {
2042 int tid = task->pid;
2043
2044 if (--index >= 0)
2045 continue;
f246315e
DD		 2046 if (tids != NULL)
2047 tids[nr_tids] = tid;
1da177e4
LT		 2048 nr_tids++;
2049 if (nr_tids >= PROC_MAXPIDS)
2050 break;
2051 } while ((task = next_thread(task)) != leader_task);
2052 read_unlock(&tasklist_lock);
2053 return nr_tids;
2054}
2055
2056/* for the /proc/ directory itself, after non-process stuff has been done */
2057int proc_pid_readdir(struct file * filp, void * dirent, filldir_t filldir)
2058{
2059 unsigned int tgid_array[PROC_MAXPIDS];
2060 char buf[PROC_NUMBUF];
2061 unsigned int nr = filp->f_pos - FIRST_PROCESS_ENTRY;
2062 unsigned int nr_tgids, i;
2063 int next_tgid;
2064
2065 if (!nr) {
2066 ino_t ino = fake_ino(0,PROC_TGID_INO);
2067 if (filldir(dirent, "self", 4, filp->f_pos, ino, DT_LNK) < 0)
2068 return 0;
2069 filp->f_pos++;
2070 nr++;
2071 }
2072
2073 /* f_version caches the tgid value that the last readdir call couldn't
2074 * return. lseek aka telldir automagically resets f_version to 0.
2075 */
2076 next_tgid = filp->f_version;
2077 filp->f_version = 0;
2078 for (;;) {
2079 nr_tgids = get_tgid_list(nr, next_tgid, tgid_array);
2080 if (!nr_tgids) {
2081 /* no more entries ! */
2082 break;
2083 }
2084 next_tgid = 0;
2085
2086 /* do not use the last found pid, reserve it for next_tgid */
2087 if (nr_tgids == PROC_MAXPIDS) {
2088 nr_tgids--;
2089 next_tgid = tgid_array[nr_tgids];
2090 }
2091
2092 for (i=0;i<nr_tgids;i++) {
2093 int tgid = tgid_array[i];
2094 ino_t ino = fake_ino(tgid,PROC_TGID_INO);
2095 unsigned long j = PROC_NUMBUF;
2096
2097 do
2098 buf[--j] = '0' + (tgid % 10);
2099 while ((tgid /= 10) != 0);
2100
2101 if (filldir(dirent, buf+j, PROC_NUMBUF-j, filp->f_pos, ino, DT_DIR) < 0) {
2102 /* returning this tgid failed, save it as the first
2103 * pid for the next readir call */
2104 filp->f_version = tgid_array[i];
2105 goto out;
2106 }
2107 filp->f_pos++;
2108 nr++;
2109 }
2110 }
2111out:
2112 return 0;
2113}
2114
2115/* for the /proc/TGID/task/ directories */
2116static int proc_task_readdir(struct file * filp, void * dirent, filldir_t filldir)
2117{
2118 unsigned int tid_array[PROC_MAXPIDS];
2119 char buf[PROC_NUMBUF];
2120 unsigned int nr_tids, i;
2121 struct dentry *dentry = filp->f_dentry;
2122 struct inode *inode = dentry->d_inode;
2123 int retval = -ENOENT;
2124 ino_t ino;
2125 unsigned long pos = filp->f_pos; /* avoiding "long long" filp->f_pos */
2126
2127 if (!pid_alive(proc_task(inode)))
2128 goto out;
2129 retval = 0;
2130
2131 switch (pos) {
2132 case 0:
2133 ino = inode->i_ino;
2134 if (filldir(dirent, ".", 1, pos, ino, DT_DIR) < 0)
2135 goto out;
2136 pos++;
2137 /* fall through */
2138 case 1:
2139 ino = parent_ino(dentry);
2140 if (filldir(dirent, "..", 2, pos, ino, DT_DIR) < 0)
2141 goto out;
2142 pos++;
2143 /* fall through */
2144 }
2145
2146 nr_tids = get_tid_list(pos, tid_array, inode);
f246315e 2147 inode->i_nlink = pos + nr_tids;
1da177e4
LT		 2148
2149 for (i = 0; i < nr_tids; i++) {
2150 unsigned long j = PROC_NUMBUF;
2151 int tid = tid_array[i];
2152
2153 ino = fake_ino(tid,PROC_TID_INO);
2154
2155 do
2156 buf[--j] = '0' + (tid % 10);
2157 while ((tid /= 10) != 0);
2158
2159 if (filldir(dirent, buf+j, PROC_NUMBUF-j, pos, ino, DT_DIR) < 0)
2160 break;
2161 pos++;
2162 }
2163out:
2164 filp->f_pos = pos;
2165 return retval;
2166}
Linux 6.x block layer and io_uring tree(s)