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[PATCH] alpha: fix-up schedule_timeout() usage
[linux-2.6.22.y-op.git] / fs / proc / base.c
blob23db452ab428c9896a96aad29217100e67aeb78a
1 /*
2 * linux/fs/proc/base.c
3 *
4 * Copyright (C) 1991, 1992 Linus Torvalds
5 *
6 * proc base directory handling functions
7 *
8 * 1999, Al Viro. Rewritten. Now it covers the whole per-process part.
9 * Instead of using magical inumbers to determine the kind of object
10 * we allocate and fill in-core inodes upon lookup. They don't even
11 * go into icache. We cache the reference to task_struct upon lookup too.
12 * Eventually it should become a filesystem in its own. We don't use the
13 * rest of procfs anymore.
14 *
15 *
16 * Changelog:
17 * 17-Jan-2005
18 * Allan Bezerra
19 * Bruna Moreira <bruna.moreira@indt.org.br>
20 * Edjard Mota <edjard.mota@indt.org.br>
21 * Ilias Biris <ilias.biris@indt.org.br>
22 * Mauricio Lin <mauricio.lin@indt.org.br>
23 *
24 * Embedded Linux Lab - 10LE Instituto Nokia de Tecnologia - INdT
25 *
26 * A new process specific entry (smaps) included in /proc. It shows the
27 * size of rss for each memory area. The maps entry lacks information
28 * about physical memory size (rss) for each mapped file, i.e.,
29 * rss information for executables and library files.
30 * This additional information is useful for any tools that need to know
31 * about physical memory consumption for a process specific library.
32 *
33 * Changelog:
34 * 21-Feb-2005
35 * Embedded Linux Lab - 10LE Instituto Nokia de Tecnologia - INdT
36 * Pud inclusion in the page table walking.
37 *
38 * ChangeLog:
39 * 10-Mar-2005
40 * 10LE Instituto Nokia de Tecnologia - INdT:
41 * A better way to walks through the page table as suggested by Hugh Dickins.
42 *
43 * Simo Piiroinen <simo.piiroinen@nokia.com>:
44 * Smaps information related to shared, private, clean and dirty pages.
45 *
46 * Paul Mundt <paul.mundt@nokia.com>:
47 * Overall revision about smaps.
48 */
49
50 #include <asm/uaccess.h>
51
52 #include <linux/config.h>
53 #include <linux/errno.h>
54 #include <linux/time.h>
55 #include <linux/proc_fs.h>
56 #include <linux/stat.h>
57 #include <linux/init.h>
58 #include <linux/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/rcupdate.h>
66 #include <linux/kallsyms.h>
67 #include <linux/mount.h>
68 #include <linux/security.h>
69 #include <linux/ptrace.h>
70 #include <linux/seccomp.h>
71 #include <linux/cpuset.h>
72 #include <linux/audit.h>
73 #include "internal.h"
74
75 /*
76 * For hysterical raisins we keep the same inumbers as in the old procfs.
77 * Feel free to change the macro below - just keep the range distinct from
78 * inumbers of the rest of procfs (currently those are in 0x0000--0xffff).
79 * As soon as we'll get a separate superblock we will be able to forget
80 * about magical ranges too.
81 */
82
83 #define fake_ino(pid,ino) (((pid)<<16)|(ino))
84
85 enum pid_directory_inos {
86 PROC_TGID_INO = 2,
87 PROC_TGID_TASK,
88 PROC_TGID_STATUS,
89 PROC_TGID_MEM,
90 #ifdef CONFIG_SECCOMP
91 PROC_TGID_SECCOMP,
92 #endif
93 PROC_TGID_CWD,
94 PROC_TGID_ROOT,
95 PROC_TGID_EXE,
96 PROC_TGID_FD,
97 PROC_TGID_ENVIRON,
98 PROC_TGID_AUXV,
99 PROC_TGID_CMDLINE,
100 PROC_TGID_STAT,
101 PROC_TGID_STATM,
102 PROC_TGID_MAPS,
103 PROC_TGID_NUMA_MAPS,
104 PROC_TGID_MOUNTS,
105 PROC_TGID_WCHAN,
106 PROC_TGID_SMAPS,
107 #ifdef CONFIG_SCHEDSTATS
108 PROC_TGID_SCHEDSTAT,
109 #endif
110 #ifdef CONFIG_CPUSETS
111 PROC_TGID_CPUSET,
112 #endif
113 #ifdef CONFIG_SECURITY
114 PROC_TGID_ATTR,
115 PROC_TGID_ATTR_CURRENT,
116 PROC_TGID_ATTR_PREV,
117 PROC_TGID_ATTR_EXEC,
118 PROC_TGID_ATTR_FSCREATE,
119 #endif
120 #ifdef CONFIG_AUDITSYSCALL
121 PROC_TGID_LOGINUID,
122 #endif
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,
141 PROC_TID_NUMA_MAPS,
142 PROC_TID_MOUNTS,
143 PROC_TID_WCHAN,
144 PROC_TID_SMAPS,
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_OOM_SCORE,
162 PROC_TID_OOM_ADJUST,
163
164 /* Add new entries before this */
165 PROC_TID_FD_DIR = 0x8000, /* 0x8000-0xffff */
166 };
167
168 struct pid_entry {
169 int type;
170 int len;
171 char *name;
172 mode_t mode;
173 };
174
175 #define E(type,name,mode) {(type),sizeof(name)-1,(name),(mode)}
176
177 static struct pid_entry tgid_base_stuff[] = {
178 E(PROC_TGID_TASK, "task", S_IFDIR|S_IRUGO|S_IXUGO),
179 E(PROC_TGID_FD, "fd", S_IFDIR|S_IRUSR|S_IXUSR),
180 E(PROC_TGID_ENVIRON, "environ", S_IFREG|S_IRUSR),
181 E(PROC_TGID_AUXV, "auxv", S_IFREG|S_IRUSR),
182 E(PROC_TGID_STATUS, "status", S_IFREG|S_IRUGO),
183 E(PROC_TGID_CMDLINE, "cmdline", S_IFREG|S_IRUGO),
184 E(PROC_TGID_STAT, "stat", S_IFREG|S_IRUGO),
185 E(PROC_TGID_STATM, "statm", S_IFREG|S_IRUGO),
186 E(PROC_TGID_MAPS, "maps", S_IFREG|S_IRUGO),
187 #ifdef CONFIG_NUMA
188 E(PROC_TGID_NUMA_MAPS, "numa_maps", S_IFREG|S_IRUGO),
189 #endif
190 E(PROC_TGID_MEM, "mem", S_IFREG|S_IRUSR|S_IWUSR),
191 #ifdef CONFIG_SECCOMP
192 E(PROC_TGID_SECCOMP, "seccomp", S_IFREG|S_IRUSR|S_IWUSR),
193 #endif
194 E(PROC_TGID_CWD, "cwd", S_IFLNK|S_IRWXUGO),
195 E(PROC_TGID_ROOT, "root", S_IFLNK|S_IRWXUGO),
196 E(PROC_TGID_EXE, "exe", S_IFLNK|S_IRWXUGO),
197 E(PROC_TGID_MOUNTS, "mounts", S_IFREG|S_IRUGO),
198 E(PROC_TGID_SMAPS, "smaps", S_IFREG|S_IRUGO),
199 #ifdef CONFIG_SECURITY
200 E(PROC_TGID_ATTR, "attr", S_IFDIR|S_IRUGO|S_IXUGO),
201 #endif
202 #ifdef CONFIG_KALLSYMS
203 E(PROC_TGID_WCHAN, "wchan", S_IFREG|S_IRUGO),
204 #endif
205 #ifdef CONFIG_SCHEDSTATS
206 E(PROC_TGID_SCHEDSTAT, "schedstat", S_IFREG|S_IRUGO),
207 #endif
208 #ifdef CONFIG_CPUSETS
209 E(PROC_TGID_CPUSET, "cpuset", S_IFREG|S_IRUGO),
210 #endif
211 E(PROC_TGID_OOM_SCORE, "oom_score",S_IFREG|S_IRUGO),
212 E(PROC_TGID_OOM_ADJUST,"oom_adj", S_IFREG|S_IRUGO|S_IWUSR),
213 #ifdef CONFIG_AUDITSYSCALL
214 E(PROC_TGID_LOGINUID, "loginuid", S_IFREG|S_IWUSR|S_IRUGO),
215 #endif
216 {0,0,NULL,0}
217 };
218 static struct pid_entry tid_base_stuff[] = {
219 E(PROC_TID_FD, "fd", S_IFDIR|S_IRUSR|S_IXUSR),
220 E(PROC_TID_ENVIRON, "environ", S_IFREG|S_IRUSR),
221 E(PROC_TID_AUXV, "auxv", S_IFREG|S_IRUSR),
222 E(PROC_TID_STATUS, "status", S_IFREG|S_IRUGO),
223 E(PROC_TID_CMDLINE, "cmdline", S_IFREG|S_IRUGO),
224 E(PROC_TID_STAT, "stat", S_IFREG|S_IRUGO),
225 E(PROC_TID_STATM, "statm", S_IFREG|S_IRUGO),
226 E(PROC_TID_MAPS, "maps", S_IFREG|S_IRUGO),
227 #ifdef CONFIG_NUMA
228 E(PROC_TID_NUMA_MAPS, "numa_maps", S_IFREG|S_IRUGO),
229 #endif
230 E(PROC_TID_MEM, "mem", S_IFREG|S_IRUSR|S_IWUSR),
231 #ifdef CONFIG_SECCOMP
232 E(PROC_TID_SECCOMP, "seccomp", S_IFREG|S_IRUSR|S_IWUSR),
233 #endif
234 E(PROC_TID_CWD, "cwd", S_IFLNK|S_IRWXUGO),
235 E(PROC_TID_ROOT, "root", S_IFLNK|S_IRWXUGO),
236 E(PROC_TID_EXE, "exe", S_IFLNK|S_IRWXUGO),
237 E(PROC_TID_MOUNTS, "mounts", S_IFREG|S_IRUGO),
238 E(PROC_TID_SMAPS, "smaps", S_IFREG|S_IRUGO),
239 #ifdef CONFIG_SECURITY
240 E(PROC_TID_ATTR, "attr", S_IFDIR|S_IRUGO|S_IXUGO),
241 #endif
242 #ifdef CONFIG_KALLSYMS
243 E(PROC_TID_WCHAN, "wchan", S_IFREG|S_IRUGO),
244 #endif
245 #ifdef CONFIG_SCHEDSTATS
246 E(PROC_TID_SCHEDSTAT, "schedstat",S_IFREG|S_IRUGO),
247 #endif
248 #ifdef CONFIG_CPUSETS
249 E(PROC_TID_CPUSET, "cpuset", S_IFREG|S_IRUGO),
250 #endif
251 E(PROC_TID_OOM_SCORE, "oom_score",S_IFREG|S_IRUGO),
252 E(PROC_TID_OOM_ADJUST, "oom_adj", S_IFREG|S_IRUGO|S_IWUSR),
253 #ifdef CONFIG_AUDITSYSCALL
254 E(PROC_TID_LOGINUID, "loginuid", S_IFREG|S_IWUSR|S_IRUGO),
255 #endif
256 {0,0,NULL,0}
257 };
258
259 #ifdef CONFIG_SECURITY
260 static struct pid_entry tgid_attr_stuff[] = {
261 E(PROC_TGID_ATTR_CURRENT, "current", S_IFREG|S_IRUGO|S_IWUGO),
262 E(PROC_TGID_ATTR_PREV, "prev", S_IFREG|S_IRUGO),
263 E(PROC_TGID_ATTR_EXEC, "exec", S_IFREG|S_IRUGO|S_IWUGO),
264 E(PROC_TGID_ATTR_FSCREATE, "fscreate", S_IFREG|S_IRUGO|S_IWUGO),
265 {0,0,NULL,0}
266 };
267 static struct pid_entry tid_attr_stuff[] = {
268 E(PROC_TID_ATTR_CURRENT, "current", S_IFREG|S_IRUGO|S_IWUGO),
269 E(PROC_TID_ATTR_PREV, "prev", S_IFREG|S_IRUGO),
270 E(PROC_TID_ATTR_EXEC, "exec", S_IFREG|S_IRUGO|S_IWUGO),
271 E(PROC_TID_ATTR_FSCREATE, "fscreate", S_IFREG|S_IRUGO|S_IWUGO),
272 {0,0,NULL,0}
273 };
274 #endif
275
276 #undef E
277
278 static int proc_fd_link(struct inode *inode, struct dentry **dentry, struct vfsmount **mnt)
279 {
280 struct task_struct *task = proc_task(inode);
281 struct files_struct *files;
282 struct file *file;
283 int fd = proc_type(inode) - PROC_TID_FD_DIR;
284
285 files = get_files_struct(task);
286 if (files) {
287 rcu_read_lock();
288 file = fcheck_files(files, fd);
289 if (file) {
290 *mnt = mntget(file->f_vfsmnt);
291 *dentry = dget(file->f_dentry);
292 rcu_read_unlock();
293 put_files_struct(files);
294 return 0;
295 }
296 rcu_read_unlock();
297 put_files_struct(files);
298 }
299 return -ENOENT;
300 }
301
302 static struct fs_struct *get_fs_struct(struct task_struct *task)
303 {
304 struct fs_struct *fs;
305 task_lock(task);
306 fs = task->fs;
307 if(fs)
308 atomic_inc(&fs->count);
309 task_unlock(task);
310 return fs;
311 }
312
313 static int proc_cwd_link(struct inode *inode, struct dentry **dentry, struct vfsmount **mnt)
314 {
315 struct fs_struct *fs = get_fs_struct(proc_task(inode));
316 int result = -ENOENT;
317 if (fs) {
318 read_lock(&fs->lock);
319 *mnt = mntget(fs->pwdmnt);
320 *dentry = dget(fs->pwd);
321 read_unlock(&fs->lock);
322 result = 0;
323 put_fs_struct(fs);
324 }
325 return result;
326 }
327
328 static int proc_root_link(struct inode *inode, struct dentry **dentry, struct vfsmount **mnt)
329 {
330 struct fs_struct *fs = get_fs_struct(proc_task(inode));
331 int result = -ENOENT;
332 if (fs) {
333 read_lock(&fs->lock);
334 *mnt = mntget(fs->rootmnt);
335 *dentry = dget(fs->root);
336 read_unlock(&fs->lock);
337 result = 0;
338 put_fs_struct(fs);
339 }
340 return result;
341 }
342
343 #define MAY_PTRACE(task) \
344 (task == current || \
345 (task->parent == current && \
346 (task->ptrace & PT_PTRACED) && \
347 (task->state == TASK_STOPPED || task->state == TASK_TRACED) && \
348 security_ptrace(current,task) == 0))
349
350 static int proc_pid_environ(struct task_struct *task, char * buffer)
351 {
352 int res = 0;
353 struct mm_struct *mm = get_task_mm(task);
354 if (mm) {
355 unsigned int len = mm->env_end - mm->env_start;
356 if (len > PAGE_SIZE)
357 len = PAGE_SIZE;
358 res = access_process_vm(task, mm->env_start, buffer, len, 0);
359 if (!ptrace_may_attach(task))
360 res = -ESRCH;
361 mmput(mm);
362 }
363 return res;
364 }
365
366 static int proc_pid_cmdline(struct task_struct *task, char * buffer)
367 {
368 int res = 0;
369 unsigned int len;
370 struct mm_struct *mm = get_task_mm(task);
371 if (!mm)
372 goto out;
373 if (!mm->arg_end)
374 goto out_mm; /* Shh! No looking before we're done */
375
376 len = mm->arg_end - mm->arg_start;
377
378 if (len > PAGE_SIZE)
379 len = PAGE_SIZE;
380
381 res = access_process_vm(task, mm->arg_start, buffer, len, 0);
382
383 // If the nul at the end of args has been overwritten, then
384 // assume application is using setproctitle(3).
385 if (res > 0 && buffer[res-1] != '\0' && len < PAGE_SIZE) {
386 len = strnlen(buffer, res);
387 if (len < res) {
388 res = len;
389 } else {
390 len = mm->env_end - mm->env_start;
391 if (len > PAGE_SIZE - res)
392 len = PAGE_SIZE - res;
393 res += access_process_vm(task, mm->env_start, buffer+res, len, 0);
394 res = strnlen(buffer, res);
395 }
396 }
397 out_mm:
398 mmput(mm);
399 out:
400 return res;
401 }
402
403 static int proc_pid_auxv(struct task_struct *task, char *buffer)
404 {
405 int res = 0;
406 struct mm_struct *mm = get_task_mm(task);
407 if (mm) {
408 unsigned int nwords = 0;
409 do
410 nwords += 2;
411 while (mm->saved_auxv[nwords - 2] != 0); /* AT_NULL */
412 res = nwords * sizeof(mm->saved_auxv[0]);
413 if (res > PAGE_SIZE)
414 res = PAGE_SIZE;
415 memcpy(buffer, mm->saved_auxv, res);
416 mmput(mm);
417 }
418 return res;
419 }
420
421
422 #ifdef CONFIG_KALLSYMS
423 /*
424 * Provides a wchan file via kallsyms in a proper one-value-per-file format.
425 * Returns the resolved symbol. If that fails, simply return the address.
426 */
427 static int proc_pid_wchan(struct task_struct *task, char *buffer)
428 {
429 char *modname;
430 const char *sym_name;
431 unsigned long wchan, size, offset;
432 char namebuf[KSYM_NAME_LEN+1];
433
434 wchan = get_wchan(task);
435
436 sym_name = kallsyms_lookup(wchan, &size, &offset, &modname, namebuf);
437 if (sym_name)
438 return sprintf(buffer, "%s", sym_name);
439 return sprintf(buffer, "%lu", wchan);
440 }
441 #endif /* CONFIG_KALLSYMS */
442
443 #ifdef CONFIG_SCHEDSTATS
444 /*
445 * Provides /proc/PID/schedstat
446 */
447 static int proc_pid_schedstat(struct task_struct *task, char *buffer)
448 {
449 return sprintf(buffer, "%lu %lu %lu\n",
450 task->sched_info.cpu_time,
451 task->sched_info.run_delay,
452 task->sched_info.pcnt);
453 }
454 #endif
455
456 /* The badness from the OOM killer */
457 unsigned long badness(struct task_struct *p, unsigned long uptime);
458 static int proc_oom_score(struct task_struct *task, char *buffer)
459 {
460 unsigned long points;
461 struct timespec uptime;
462
463 do_posix_clock_monotonic_gettime(&uptime);
464 points = badness(task, uptime.tv_sec);
465 return sprintf(buffer, "%lu\n", points);
466 }
467
468 /************************************************************************/
469 /* Here the fs part begins */
470 /************************************************************************/
471
472 /* permission checks */
473
474 static int proc_check_root(struct inode *inode)
475 {
476 struct dentry *de, *base, *root;
477 struct vfsmount *our_vfsmnt, *vfsmnt, *mnt;
478 int res = 0;
479
480 if (proc_root_link(inode, &root, &vfsmnt)) /* Ewww... */
481 return -ENOENT;
482 read_lock(&current->fs->lock);
483 our_vfsmnt = mntget(current->fs->rootmnt);
484 base = dget(current->fs->root);
485 read_unlock(&current->fs->lock);
486
487 spin_lock(&vfsmount_lock);
488 de = root;
489 mnt = vfsmnt;
490
491 while (vfsmnt != our_vfsmnt) {
492 if (vfsmnt == vfsmnt->mnt_parent)
493 goto out;
494 de = vfsmnt->mnt_mountpoint;
495 vfsmnt = vfsmnt->mnt_parent;
496 }
497
498 if (!is_subdir(de, base))
499 goto out;
500 spin_unlock(&vfsmount_lock);
501
502 exit:
503 dput(base);
504 mntput(our_vfsmnt);
505 dput(root);
506 mntput(mnt);
507 return res;
508 out:
509 spin_unlock(&vfsmount_lock);
510 res = -EACCES;
511 goto exit;
512 }
513
514 static int proc_permission(struct inode *inode, int mask, struct nameidata *nd)
515 {
516 if (generic_permission(inode, mask, NULL) != 0)
517 return -EACCES;
518 return proc_check_root(inode);
519 }
520
521 extern struct seq_operations proc_pid_maps_op;
522 static int maps_open(struct inode *inode, struct file *file)
523 {
524 struct task_struct *task = proc_task(inode);
525 int ret = seq_open(file, &proc_pid_maps_op);
526 if (!ret) {
527 struct seq_file *m = file->private_data;
528 m->private = task;
529 }
530 return ret;
531 }
532
533 static struct file_operations proc_maps_operations = {
534 .open = maps_open,
535 .read = seq_read,
536 .llseek = seq_lseek,
537 .release = seq_release,
538 };
539
540 #ifdef CONFIG_NUMA
541 extern struct seq_operations proc_pid_numa_maps_op;
542 static int numa_maps_open(struct inode *inode, struct file *file)
543 {
544 struct task_struct *task = proc_task(inode);
545 int ret = seq_open(file, &proc_pid_numa_maps_op);
546 if (!ret) {
547 struct seq_file *m = file->private_data;
548 m->private = task;
549 }
550 return ret;
551 }
552
553 static struct file_operations proc_numa_maps_operations = {
554 .open = numa_maps_open,
555 .read = seq_read,
556 .llseek = seq_lseek,
557 .release = seq_release,
558 };
559 #endif
560
561 extern struct seq_operations proc_pid_smaps_op;
562 static int smaps_open(struct inode *inode, struct file *file)
563 {
564 struct task_struct *task = proc_task(inode);
565 int ret = seq_open(file, &proc_pid_smaps_op);
566 if (!ret) {
567 struct seq_file *m = file->private_data;
568 m->private = task;
569 }
570 return ret;
571 }
572
573 static struct file_operations proc_smaps_operations = {
574 .open = smaps_open,
575 .read = seq_read,
576 .llseek = seq_lseek,
577 .release = seq_release,
578 };
579
580 extern struct seq_operations mounts_op;
581 static int mounts_open(struct inode *inode, struct file *file)
582 {
583 struct task_struct *task = proc_task(inode);
584 int ret = seq_open(file, &mounts_op);
585
586 if (!ret) {
587 struct seq_file *m = file->private_data;
588 struct namespace *namespace;
589 task_lock(task);
590 namespace = task->namespace;
591 if (namespace)
592 get_namespace(namespace);
593 task_unlock(task);
594
595 if (namespace)
596 m->private = namespace;
597 else {
598 seq_release(inode, file);
599 ret = -EINVAL;
600 }
601 }
602 return ret;
603 }
604
605 static int mounts_release(struct inode *inode, struct file *file)
606 {
607 struct seq_file *m = file->private_data;
608 struct namespace *namespace = m->private;
609 put_namespace(namespace);
610 return seq_release(inode, file);
611 }
612
613 static struct file_operations proc_mounts_operations = {
614 .open = mounts_open,
615 .read = seq_read,
616 .llseek = seq_lseek,
617 .release = mounts_release,
618 };
619
620 #define PROC_BLOCK_SIZE (3*1024) /* 4K page size but our output routines use some slack for overruns */
621
622 static ssize_t proc_info_read(struct file * file, char __user * buf,
623 size_t count, loff_t *ppos)
624 {
625 struct inode * inode = file->f_dentry->d_inode;
626 unsigned long page;
627 ssize_t length;
628 struct task_struct *task = proc_task(inode);
629
630 if (count > PROC_BLOCK_SIZE)
631 count = PROC_BLOCK_SIZE;
632 if (!(page = __get_free_page(GFP_KERNEL)))
633 return -ENOMEM;
634
635 length = PROC_I(inode)->op.proc_read(task, (char*)page);
636
637 if (length >= 0)
638 length = simple_read_from_buffer(buf, count, ppos, (char *)page, length);
639 free_page(page);
640 return length;
641 }
642
643 static struct file_operations proc_info_file_operations = {
644 .read = proc_info_read,
645 };
646
647 static int mem_open(struct inode* inode, struct file* file)
648 {
649 file->private_data = (void*)((long)current->self_exec_id);
650 return 0;
651 }
652
653 static ssize_t mem_read(struct file * file, char __user * buf,
654 size_t count, loff_t *ppos)
655 {
656 struct task_struct *task = proc_task(file->f_dentry->d_inode);
657 char *page;
658 unsigned long src = *ppos;
659 int ret = -ESRCH;
660 struct mm_struct *mm;
661
662 if (!MAY_PTRACE(task) || !ptrace_may_attach(task))
663 goto out;
664
665 ret = -ENOMEM;
666 page = (char *)__get_free_page(GFP_USER);
667 if (!page)
668 goto out;
669
670 ret = 0;
671
672 mm = get_task_mm(task);
673 if (!mm)
674 goto out_free;
675
676 ret = -EIO;
677
678 if (file->private_data != (void*)((long)current->self_exec_id))
679 goto out_put;
680
681 ret = 0;
682
683 while (count > 0) {
684 int this_len, retval;
685
686 this_len = (count > PAGE_SIZE) ? PAGE_SIZE : count;
687 retval = access_process_vm(task, src, page, this_len, 0);
688 if (!retval || !MAY_PTRACE(task) || !ptrace_may_attach(task)) {
689 if (!ret)
690 ret = -EIO;
691 break;
692 }
693
694 if (copy_to_user(buf, page, retval)) {
695 ret = -EFAULT;
696 break;
697 }
698
699 ret += retval;
700 src += retval;
701 buf += retval;
702 count -= retval;
703 }
704 *ppos = src;
705
706 out_put:
707 mmput(mm);
708 out_free:
709 free_page((unsigned long) page);
710 out:
711 return ret;
712 }
713
714 #define mem_write NULL
715
716 #ifndef mem_write
717 /* This is a security hazard */
718 static ssize_t mem_write(struct file * file, const char * buf,
719 size_t count, loff_t *ppos)
720 {
721 int copied = 0;
722 char *page;
723 struct task_struct *task = proc_task(file->f_dentry->d_inode);
724 unsigned long dst = *ppos;
725
726 if (!MAY_PTRACE(task) || !ptrace_may_attach(task))
727 return -ESRCH;
728
729 page = (char *)__get_free_page(GFP_USER);
730 if (!page)
731 return -ENOMEM;
732
733 while (count > 0) {
734 int this_len, retval;
735
736 this_len = (count > PAGE_SIZE) ? PAGE_SIZE : count;
737 if (copy_from_user(page, buf, this_len)) {
738 copied = -EFAULT;
739 break;
740 }
741 retval = access_process_vm(task, dst, page, this_len, 1);
742 if (!retval) {
743 if (!copied)
744 copied = -EIO;
745 break;
746 }
747 copied += retval;
748 buf += retval;
749 dst += retval;
750 count -= retval;
751 }
752 *ppos = dst;
753 free_page((unsigned long) page);
754 return copied;
755 }
756 #endif
757
758 static loff_t mem_lseek(struct file * file, loff_t offset, int orig)
759 {
760 switch (orig) {
761 case 0:
762 file->f_pos = offset;
763 break;
764 case 1:
765 file->f_pos += offset;
766 break;
767 default:
768 return -EINVAL;
769 }
770 force_successful_syscall_return();
771 return file->f_pos;
772 }
773
774 static struct file_operations proc_mem_operations = {
775 .llseek = mem_lseek,
776 .read = mem_read,
777 .write = mem_write,
778 .open = mem_open,
779 };
780
781 static ssize_t oom_adjust_read(struct file *file, char __user *buf,
782 size_t count, loff_t *ppos)
783 {
784 struct task_struct *task = proc_task(file->f_dentry->d_inode);
785 char buffer[8];
786 size_t len;
787 int oom_adjust = task->oomkilladj;
788 loff_t __ppos = *ppos;
789
790 len = sprintf(buffer, "%i\n", oom_adjust);
791 if (__ppos >= len)
792 return 0;
793 if (count > len-__ppos)
794 count = len-__ppos;
795 if (copy_to_user(buf, buffer + __ppos, count))
796 return -EFAULT;
797 *ppos = __ppos + count;
798 return count;
799 }
800
801 static ssize_t oom_adjust_write(struct file *file, const char __user *buf,
802 size_t count, loff_t *ppos)
803 {
804 struct task_struct *task = proc_task(file->f_dentry->d_inode);
805 char buffer[8], *end;
806 int oom_adjust;
807
808 if (!capable(CAP_SYS_RESOURCE))
809 return -EPERM;
810 memset(buffer, 0, 8);
811 if (count > 6)
812 count = 6;
813 if (copy_from_user(buffer, buf, count))
814 return -EFAULT;
815 oom_adjust = simple_strtol(buffer, &end, 0);
816 if ((oom_adjust < -16 || oom_adjust > 15) && oom_adjust != OOM_DISABLE)
817 return -EINVAL;
818 if (*end == '\n')
819 end++;
820 task->oomkilladj = oom_adjust;
821 if (end - buffer == 0)
822 return -EIO;
823 return end - buffer;
824 }
825
826 static struct file_operations proc_oom_adjust_operations = {
827 .read = oom_adjust_read,
828 .write = oom_adjust_write,
829 };
830
831 static struct inode_operations proc_mem_inode_operations = {
832 .permission = proc_permission,
833 };
834
835 #ifdef CONFIG_AUDITSYSCALL
836 #define TMPBUFLEN 21
837 static ssize_t proc_loginuid_read(struct file * file, char __user * buf,
838 size_t count, loff_t *ppos)
839 {
840 struct inode * inode = file->f_dentry->d_inode;
841 struct task_struct *task = proc_task(inode);
842 ssize_t length;
843 char tmpbuf[TMPBUFLEN];
844
845 length = scnprintf(tmpbuf, TMPBUFLEN, "%u",
846 audit_get_loginuid(task->audit_context));
847 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
848 }
849
850 static ssize_t proc_loginuid_write(struct file * file, const char __user * buf,
851 size_t count, loff_t *ppos)
852 {
853 struct inode * inode = file->f_dentry->d_inode;
854 char *page, *tmp;
855 ssize_t length;
856 struct task_struct *task = proc_task(inode);
857 uid_t loginuid;
858
859 if (!capable(CAP_AUDIT_CONTROL))
860 return -EPERM;
861
862 if (current != task)
863 return -EPERM;
864
865 if (count > PAGE_SIZE)
866 count = PAGE_SIZE;
867
868 if (*ppos != 0) {
869 /* No partial writes. */
870 return -EINVAL;
871 }
872 page = (char*)__get_free_page(GFP_USER);
873 if (!page)
874 return -ENOMEM;
875 length = -EFAULT;
876 if (copy_from_user(page, buf, count))
877 goto out_free_page;
878
879 loginuid = simple_strtoul(page, &tmp, 10);
880 if (tmp == page) {
881 length = -EINVAL;
882 goto out_free_page;
883
884 }
885 length = audit_set_loginuid(task, loginuid);
886 if (likely(length == 0))
887 length = count;
888
889 out_free_page:
890 free_page((unsigned long) page);
891 return length;
892 }
893
894 static struct file_operations proc_loginuid_operations = {
895 .read = proc_loginuid_read,
896 .write = proc_loginuid_write,
897 };
898 #endif
899
900 #ifdef CONFIG_SECCOMP
901 static ssize_t seccomp_read(struct file *file, char __user *buf,
902 size_t count, loff_t *ppos)
903 {
904 struct task_struct *tsk = proc_task(file->f_dentry->d_inode);
905 char __buf[20];
906 loff_t __ppos = *ppos;
907 size_t len;
908
909 /* no need to print the trailing zero, so use only len */
910 len = sprintf(__buf, "%u\n", tsk->seccomp.mode);
911 if (__ppos >= len)
912 return 0;
913 if (count > len - __ppos)
914 count = len - __ppos;
915 if (copy_to_user(buf, __buf + __ppos, count))
916 return -EFAULT;
917 *ppos = __ppos + count;
918 return count;
919 }
920
921 static ssize_t seccomp_write(struct file *file, const char __user *buf,
922 size_t count, loff_t *ppos)
923 {
924 struct task_struct *tsk = proc_task(file->f_dentry->d_inode);
925 char __buf[20], *end;
926 unsigned int seccomp_mode;
927
928 /* can set it only once to be even more secure */
929 if (unlikely(tsk->seccomp.mode))
930 return -EPERM;
931
932 memset(__buf, 0, sizeof(__buf));
933 count = min(count, sizeof(__buf) - 1);
934 if (copy_from_user(__buf, buf, count))
935 return -EFAULT;
936 seccomp_mode = simple_strtoul(__buf, &end, 0);
937 if (*end == '\n')
938 end++;
939 if (seccomp_mode && seccomp_mode <= NR_SECCOMP_MODES) {
940 tsk->seccomp.mode = seccomp_mode;
941 set_tsk_thread_flag(tsk, TIF_SECCOMP);
942 } else
943 return -EINVAL;
944 if (unlikely(!(end - __buf)))
945 return -EIO;
946 return end - __buf;
947 }
948
949 static struct file_operations proc_seccomp_operations = {
950 .read = seccomp_read,
951 .write = seccomp_write,
952 };
953 #endif /* CONFIG_SECCOMP */
954
955 static void *proc_pid_follow_link(struct dentry *dentry, struct nameidata *nd)
956 {
957 struct inode *inode = dentry->d_inode;
958 int error = -EACCES;
959
960 /* We don't need a base pointer in the /proc filesystem */
961 path_release(nd);
962
963 if (current->fsuid != inode->i_uid && !capable(CAP_DAC_OVERRIDE))
964 goto out;
965 error = proc_check_root(inode);
966 if (error)
967 goto out;
968
969 error = PROC_I(inode)->op.proc_get_link(inode, &nd->dentry, &nd->mnt);
970 nd->last_type = LAST_BIND;
971 out:
972 return ERR_PTR(error);
973 }
974
975 static int do_proc_readlink(struct dentry *dentry, struct vfsmount *mnt,
976 char __user *buffer, int buflen)
977 {
978 struct inode * inode;
979 char *tmp = (char*)__get_free_page(GFP_KERNEL), *path;
980 int len;
981
982 if (!tmp)
983 return -ENOMEM;
984
985 inode = dentry->d_inode;
986 path = d_path(dentry, mnt, tmp, PAGE_SIZE);
987 len = PTR_ERR(path);
988 if (IS_ERR(path))
989 goto out;
990 len = tmp + PAGE_SIZE - 1 - path;
991
992 if (len > buflen)
993 len = buflen;
994 if (copy_to_user(buffer, path, len))
995 len = -EFAULT;
996 out:
997 free_page((unsigned long)tmp);
998 return len;
999 }
1000
1001 static int proc_pid_readlink(struct dentry * dentry, char __user * buffer, int buflen)
1002 {
1003 int error = -EACCES;
1004 struct inode *inode = dentry->d_inode;
1005 struct dentry *de;
1006 struct vfsmount *mnt = NULL;
1007
1008 lock_kernel();
1009
1010 if (current->fsuid != inode->i_uid && !capable(CAP_DAC_OVERRIDE))
1011 goto out;
1012 error = proc_check_root(inode);
1013 if (error)
1014 goto out;
1015
1016 error = PROC_I(inode)->op.proc_get_link(inode, &de, &mnt);
1017 if (error)
1018 goto out;
1019
1020 error = do_proc_readlink(de, mnt, buffer, buflen);
1021 dput(de);
1022 mntput(mnt);
1023 out:
1024 unlock_kernel();
1025 return error;
1026 }
1027
1028 static struct inode_operations proc_pid_link_inode_operations = {
1029 .readlink = proc_pid_readlink,
1030 .follow_link = proc_pid_follow_link
1031 };
1032
1033 #define NUMBUF 10
1034
1035 static int proc_readfd(struct file * filp, void * dirent, filldir_t filldir)
1036 {
1037 struct inode *inode = filp->f_dentry->d_inode;
1038 struct task_struct *p = proc_task(inode);
1039 unsigned int fd, tid, ino;
1040 int retval;
1041 char buf[NUMBUF];
1042 struct files_struct * files;
1043 struct fdtable *fdt;
1044
1045 retval = -ENOENT;
1046 if (!pid_alive(p))
1047 goto out;
1048 retval = 0;
1049 tid = p->pid;
1050
1051 fd = filp->f_pos;
1052 switch (fd) {
1053 case 0:
1054 if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0)
1055 goto out;
1056 filp->f_pos++;
1057 case 1:
1058 ino = fake_ino(tid, PROC_TID_INO);
1059 if (filldir(dirent, "..", 2, 1, ino, DT_DIR) < 0)
1060 goto out;
1061 filp->f_pos++;
1062 default:
1063 files = get_files_struct(p);
1064 if (!files)
1065 goto out;
1066 rcu_read_lock();
1067 fdt = files_fdtable(files);
1068 for (fd = filp->f_pos-2;
1069 fd < fdt->max_fds;
1070 fd++, filp->f_pos++) {
1071 unsigned int i,j;
1072
1073 if (!fcheck_files(files, fd))
1074 continue;
1075 rcu_read_unlock();
1076
1077 j = NUMBUF;
1078 i = fd;
1079 do {
1080 j--;
1081 buf[j] = '0' + (i % 10);
1082 i /= 10;
1083 } while (i);
1084
1085 ino = fake_ino(tid, PROC_TID_FD_DIR + fd);
1086 if (filldir(dirent, buf+j, NUMBUF-j, fd+2, ino, DT_LNK) < 0) {
1087 rcu_read_lock();
1088 break;
1089 }
1090 rcu_read_lock();
1091 }
1092 rcu_read_unlock();
1093 put_files_struct(files);
1094 }
1095 out:
1096 return retval;
1097 }
1098
1099 static int proc_pident_readdir(struct file *filp,
1100 void *dirent, filldir_t filldir,
1101 struct pid_entry *ents, unsigned int nents)
1102 {
1103 int i;
1104 int pid;
1105 struct dentry *dentry = filp->f_dentry;
1106 struct inode *inode = dentry->d_inode;
1107 struct pid_entry *p;
1108 ino_t ino;
1109 int ret;
1110
1111 ret = -ENOENT;
1112 if (!pid_alive(proc_task(inode)))
1113 goto out;
1114
1115 ret = 0;
1116 pid = proc_task(inode)->pid;
1117 i = filp->f_pos;
1118 switch (i) {
1119 case 0:
1120 ino = inode->i_ino;
1121 if (filldir(dirent, ".", 1, i, ino, DT_DIR) < 0)
1122 goto out;
1123 i++;
1124 filp->f_pos++;
1125 /* fall through */
1126 case 1:
1127 ino = parent_ino(dentry);
1128 if (filldir(dirent, "..", 2, i, ino, DT_DIR) < 0)
1129 goto out;
1130 i++;
1131 filp->f_pos++;
1132 /* fall through */
1133 default:
1134 i -= 2;
1135 if (i >= nents) {
1136 ret = 1;
1137 goto out;
1138 }
1139 p = ents + i;
1140 while (p->name) {
1141 if (filldir(dirent, p->name, p->len, filp->f_pos,
1142 fake_ino(pid, p->type), p->mode >> 12) < 0)
1143 goto out;
1144 filp->f_pos++;
1145 p++;
1146 }
1147 }
1148
1149 ret = 1;
1150 out:
1151 return ret;
1152 }
1153
1154 static int proc_tgid_base_readdir(struct file * filp,
1155 void * dirent, filldir_t filldir)
1156 {
1157 return proc_pident_readdir(filp,dirent,filldir,
1158 tgid_base_stuff,ARRAY_SIZE(tgid_base_stuff));
1159 }
1160
1161 static int proc_tid_base_readdir(struct file * filp,
1162 void * dirent, filldir_t filldir)
1163 {
1164 return proc_pident_readdir(filp,dirent,filldir,
1165 tid_base_stuff,ARRAY_SIZE(tid_base_stuff));
1166 }
1167
1168 /* building an inode */
1169
1170 static int task_dumpable(struct task_struct *task)
1171 {
1172 int dumpable = 0;
1173 struct mm_struct *mm;
1174
1175 task_lock(task);
1176 mm = task->mm;
1177 if (mm)
1178 dumpable = mm->dumpable;
1179 task_unlock(task);
1180 if(dumpable == 1)
1181 return 1;
1182 return 0;
1183 }
1184
1185
1186 static struct inode *proc_pid_make_inode(struct super_block * sb, struct task_struct *task, int ino)
1187 {
1188 struct inode * inode;
1189 struct proc_inode *ei;
1190
1191 /* We need a new inode */
1192
1193 inode = new_inode(sb);
1194 if (!inode)
1195 goto out;
1196
1197 /* Common stuff */
1198 ei = PROC_I(inode);
1199 ei->task = NULL;
1200 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
1201 inode->i_ino = fake_ino(task->pid, ino);
1202
1203 if (!pid_alive(task))
1204 goto out_unlock;
1205
1206 /*
1207 * grab the reference to task.
1208 */
1209 get_task_struct(task);
1210 ei->task = task;
1211 ei->type = ino;
1212 inode->i_uid = 0;
1213 inode->i_gid = 0;
1214 if (ino == PROC_TGID_INO || ino == PROC_TID_INO || task_dumpable(task)) {
1215 inode->i_uid = task->euid;
1216 inode->i_gid = task->egid;
1217 }
1218 security_task_to_inode(task, inode);
1219
1220 out:
1221 return inode;
1222
1223 out_unlock:
1224 ei->pde = NULL;
1225 iput(inode);
1226 return NULL;
1227 }
1228
1229 /* dentry stuff */
1230
1231 /*
1232 * Exceptional case: normally we are not allowed to unhash a busy
1233 * directory. In this case, however, we can do it - no aliasing problems
1234 * due to the way we treat inodes.
1235 *
1236 * Rewrite the inode's ownerships here because the owning task may have
1237 * performed a setuid(), etc.
1238 */
1239 static int pid_revalidate(struct dentry *dentry, struct nameidata *nd)
1240 {
1241 struct inode *inode = dentry->d_inode;
1242 struct task_struct *task = proc_task(inode);
1243 if (pid_alive(task)) {
1244 if (proc_type(inode) == PROC_TGID_INO || proc_type(inode) == PROC_TID_INO || task_dumpable(task)) {
1245 inode->i_uid = task->euid;
1246 inode->i_gid = task->egid;
1247 } else {
1248 inode->i_uid = 0;
1249 inode->i_gid = 0;
1250 }
1251 security_task_to_inode(task, inode);
1252 return 1;
1253 }
1254 d_drop(dentry);
1255 return 0;
1256 }
1257
1258 static int tid_fd_revalidate(struct dentry *dentry, struct nameidata *nd)
1259 {
1260 struct inode *inode = dentry->d_inode;
1261 struct task_struct *task = proc_task(inode);
1262 int fd = proc_type(inode) - PROC_TID_FD_DIR;
1263 struct files_struct *files;
1264
1265 files = get_files_struct(task);
1266 if (files) {
1267 rcu_read_lock();
1268 if (fcheck_files(files, fd)) {
1269 rcu_read_unlock();
1270 put_files_struct(files);
1271 if (task_dumpable(task)) {
1272 inode->i_uid = task->euid;
1273 inode->i_gid = task->egid;
1274 } else {
1275 inode->i_uid = 0;
1276 inode->i_gid = 0;
1277 }
1278 security_task_to_inode(task, inode);
1279 return 1;
1280 }
1281 rcu_read_unlock();
1282 put_files_struct(files);
1283 }
1284 d_drop(dentry);
1285 return 0;
1286 }
1287
1288 static void pid_base_iput(struct dentry *dentry, struct inode *inode)
1289 {
1290 struct task_struct *task = proc_task(inode);
1291 spin_lock(&task->proc_lock);
1292 if (task->proc_dentry == dentry)
1293 task->proc_dentry = NULL;
1294 spin_unlock(&task->proc_lock);
1295 iput(inode);
1296 }
1297
1298 static int pid_delete_dentry(struct dentry * dentry)
1299 {
1300 /* Is the task we represent dead?
1301 * If so, then don't put the dentry on the lru list,
1302 * kill it immediately.
1303 */
1304 return !pid_alive(proc_task(dentry->d_inode));
1305 }
1306
1307 static struct dentry_operations tid_fd_dentry_operations =
1308 {
1309 .d_revalidate = tid_fd_revalidate,
1310 .d_delete = pid_delete_dentry,
1311 };
1312
1313 static struct dentry_operations pid_dentry_operations =
1314 {
1315 .d_revalidate = pid_revalidate,
1316 .d_delete = pid_delete_dentry,
1317 };
1318
1319 static struct dentry_operations pid_base_dentry_operations =
1320 {
1321 .d_revalidate = pid_revalidate,
1322 .d_iput = pid_base_iput,
1323 .d_delete = pid_delete_dentry,
1324 };
1325
1326 /* Lookups */
1327
1328 static unsigned name_to_int(struct dentry *dentry)
1329 {
1330 const char *name = dentry->d_name.name;
1331 int len = dentry->d_name.len;
1332 unsigned n = 0;
1333
1334 if (len > 1 && *name == '0')
1335 goto out;
1336 while (len-- > 0) {
1337 unsigned c = *name++ - '0';
1338 if (c > 9)
1339 goto out;
1340 if (n >= (~0U-9)/10)
1341 goto out;
1342 n *= 10;
1343 n += c;
1344 }
1345 return n;
1346 out:
1347 return ~0U;
1348 }
1349
1350 /* SMP-safe */
1351 static struct dentry *proc_lookupfd(struct inode * dir, struct dentry * dentry, struct nameidata *nd)
1352 {
1353 struct task_struct *task = proc_task(dir);
1354 unsigned fd = name_to_int(dentry);
1355 struct file * file;
1356 struct files_struct * files;
1357 struct inode *inode;
1358 struct proc_inode *ei;
1359
1360 if (fd == ~0U)
1361 goto out;
1362 if (!pid_alive(task))
1363 goto out;
1364
1365 inode = proc_pid_make_inode(dir->i_sb, task, PROC_TID_FD_DIR+fd);
1366 if (!inode)
1367 goto out;
1368 ei = PROC_I(inode);
1369 files = get_files_struct(task);
1370 if (!files)
1371 goto out_unlock;
1372 inode->i_mode = S_IFLNK;
1373 rcu_read_lock();
1374 file = fcheck_files(files, fd);
1375 if (!file)
1376 goto out_unlock2;
1377 if (file->f_mode & 1)
1378 inode->i_mode |= S_IRUSR | S_IXUSR;
1379 if (file->f_mode & 2)
1380 inode->i_mode |= S_IWUSR | S_IXUSR;
1381 rcu_read_unlock();
1382 put_files_struct(files);
1383 inode->i_op = &proc_pid_link_inode_operations;
1384 inode->i_size = 64;
1385 ei->op.proc_get_link = proc_fd_link;
1386 dentry->d_op = &tid_fd_dentry_operations;
1387 d_add(dentry, inode);
1388 return NULL;
1389
1390 out_unlock2:
1391 rcu_read_unlock();
1392 put_files_struct(files);
1393 out_unlock:
1394 iput(inode);
1395 out:
1396 return ERR_PTR(-ENOENT);
1397 }
1398
1399 static int proc_task_readdir(struct file * filp, void * dirent, filldir_t filldir);
1400 static struct dentry *proc_task_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd);
1401
1402 static struct file_operations proc_fd_operations = {
1403 .read = generic_read_dir,
1404 .readdir = proc_readfd,
1405 };
1406
1407 static struct file_operations proc_task_operations = {
1408 .read = generic_read_dir,
1409 .readdir = proc_task_readdir,
1410 };
1411
1412 /*
1413 * proc directories can do almost nothing..
1414 */
1415 static struct inode_operations proc_fd_inode_operations = {
1416 .lookup = proc_lookupfd,
1417 .permission = proc_permission,
1418 };
1419
1420 static struct inode_operations proc_task_inode_operations = {
1421 .lookup = proc_task_lookup,
1422 .permission = proc_permission,
1423 };
1424
1425 #ifdef CONFIG_SECURITY
1426 static ssize_t proc_pid_attr_read(struct file * file, char __user * buf,
1427 size_t count, loff_t *ppos)
1428 {
1429 struct inode * inode = file->f_dentry->d_inode;
1430 unsigned long page;
1431 ssize_t length;
1432 struct task_struct *task = proc_task(inode);
1433
1434 if (count > PAGE_SIZE)
1435 count = PAGE_SIZE;
1436 if (!(page = __get_free_page(GFP_KERNEL)))
1437 return -ENOMEM;
1438
1439 length = security_getprocattr(task,
1440 (char*)file->f_dentry->d_name.name,
1441 (void*)page, count);
1442 if (length >= 0)
1443 length = simple_read_from_buffer(buf, count, ppos, (char *)page, length);
1444 free_page(page);
1445 return length;
1446 }
1447
1448 static ssize_t proc_pid_attr_write(struct file * file, const char __user * buf,
1449 size_t count, loff_t *ppos)
1450 {
1451 struct inode * inode = file->f_dentry->d_inode;
1452 char *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 (*ppos != 0) {
1459 /* No partial writes. */
1460 return -EINVAL;
1461 }
1462 page = (char*)__get_free_page(GFP_USER);
1463 if (!page)
1464 return -ENOMEM;
1465 length = -EFAULT;
1466 if (copy_from_user(page, buf, count))
1467 goto out;
1468
1469 length = security_setprocattr(task,
1470 (char*)file->f_dentry->d_name.name,
1471 (void*)page, count);
1472 out:
1473 free_page((unsigned long) page);
1474 return length;
1475 }
1476
1477 static struct file_operations proc_pid_attr_operations = {
1478 .read = proc_pid_attr_read,
1479 .write = proc_pid_attr_write,
1480 };
1481
1482 static struct file_operations proc_tid_attr_operations;
1483 static struct inode_operations proc_tid_attr_inode_operations;
1484 static struct file_operations proc_tgid_attr_operations;
1485 static struct inode_operations proc_tgid_attr_inode_operations;
1486 #endif
1487
1488 static int get_tid_list(int index, unsigned int *tids, struct inode *dir);
1489
1490 /* SMP-safe */
1491 static struct dentry *proc_pident_lookup(struct inode *dir,
1492 struct dentry *dentry,
1493 struct pid_entry *ents)
1494 {
1495 struct inode *inode;
1496 int error;
1497 struct task_struct *task = proc_task(dir);
1498 struct pid_entry *p;
1499 struct proc_inode *ei;
1500
1501 error = -ENOENT;
1502 inode = NULL;
1503
1504 if (!pid_alive(task))
1505 goto out;
1506
1507 for (p = ents; p->name; p++) {
1508 if (p->len != dentry->d_name.len)
1509 continue;
1510 if (!memcmp(dentry->d_name.name, p->name, p->len))
1511 break;
1512 }
1513 if (!p->name)
1514 goto out;
1515
1516 error = -EINVAL;
1517 inode = proc_pid_make_inode(dir->i_sb, task, p->type);
1518 if (!inode)
1519 goto out;
1520
1521 ei = PROC_I(inode);
1522 inode->i_mode = p->mode;
1523 /*
1524 * Yes, it does not scale. And it should not. Don't add
1525 * new entries into /proc/<tgid>/ without very good reasons.
1526 */
1527 switch(p->type) {
1528 case PROC_TGID_TASK:
1529 inode->i_nlink = 2 + get_tid_list(2, NULL, dir);
1530 inode->i_op = &proc_task_inode_operations;
1531 inode->i_fop = &proc_task_operations;
1532 break;
1533 case PROC_TID_FD:
1534 case PROC_TGID_FD:
1535 inode->i_nlink = 2;
1536 inode->i_op = &proc_fd_inode_operations;
1537 inode->i_fop = &proc_fd_operations;
1538 break;
1539 case PROC_TID_EXE:
1540 case PROC_TGID_EXE:
1541 inode->i_op = &proc_pid_link_inode_operations;
1542 ei->op.proc_get_link = proc_exe_link;
1543 break;
1544 case PROC_TID_CWD:
1545 case PROC_TGID_CWD:
1546 inode->i_op = &proc_pid_link_inode_operations;
1547 ei->op.proc_get_link = proc_cwd_link;
1548 break;
1549 case PROC_TID_ROOT:
1550 case PROC_TGID_ROOT:
1551 inode->i_op = &proc_pid_link_inode_operations;
1552 ei->op.proc_get_link = proc_root_link;
1553 break;
1554 case PROC_TID_ENVIRON:
1555 case PROC_TGID_ENVIRON:
1556 inode->i_fop = &proc_info_file_operations;
1557 ei->op.proc_read = proc_pid_environ;
1558 break;
1559 case PROC_TID_AUXV:
1560 case PROC_TGID_AUXV:
1561 inode->i_fop = &proc_info_file_operations;
1562 ei->op.proc_read = proc_pid_auxv;
1563 break;
1564 case PROC_TID_STATUS:
1565 case PROC_TGID_STATUS:
1566 inode->i_fop = &proc_info_file_operations;
1567 ei->op.proc_read = proc_pid_status;
1568 break;
1569 case PROC_TID_STAT:
1570 inode->i_fop = &proc_info_file_operations;
1571 ei->op.proc_read = proc_tid_stat;
1572 break;
1573 case PROC_TGID_STAT:
1574 inode->i_fop = &proc_info_file_operations;
1575 ei->op.proc_read = proc_tgid_stat;
1576 break;
1577 case PROC_TID_CMDLINE:
1578 case PROC_TGID_CMDLINE:
1579 inode->i_fop = &proc_info_file_operations;
1580 ei->op.proc_read = proc_pid_cmdline;
1581 break;
1582 case PROC_TID_STATM:
1583 case PROC_TGID_STATM:
1584 inode->i_fop = &proc_info_file_operations;
1585 ei->op.proc_read = proc_pid_statm;
1586 break;
1587 case PROC_TID_MAPS:
1588 case PROC_TGID_MAPS:
1589 inode->i_fop = &proc_maps_operations;
1590 break;
1591 #ifdef CONFIG_NUMA
1592 case PROC_TID_NUMA_MAPS:
1593 case PROC_TGID_NUMA_MAPS:
1594 inode->i_fop = &proc_numa_maps_operations;
1595 break;
1596 #endif
1597 case PROC_TID_MEM:
1598 case PROC_TGID_MEM:
1599 inode->i_op = &proc_mem_inode_operations;
1600 inode->i_fop = &proc_mem_operations;
1601 break;
1602 #ifdef CONFIG_SECCOMP
1603 case PROC_TID_SECCOMP:
1604 case PROC_TGID_SECCOMP:
1605 inode->i_fop = &proc_seccomp_operations;
1606 break;
1607 #endif /* CONFIG_SECCOMP */
1608 case PROC_TID_MOUNTS:
1609 case PROC_TGID_MOUNTS:
1610 inode->i_fop = &proc_mounts_operations;
1611 break;
1612 case PROC_TID_SMAPS:
1613 case PROC_TGID_SMAPS:
1614 inode->i_fop = &proc_smaps_operations;
1615 break;
1616 #ifdef CONFIG_SECURITY
1617 case PROC_TID_ATTR:
1618 inode->i_nlink = 2;
1619 inode->i_op = &proc_tid_attr_inode_operations;
1620 inode->i_fop = &proc_tid_attr_operations;
1621 break;
1622 case PROC_TGID_ATTR:
1623 inode->i_nlink = 2;
1624 inode->i_op = &proc_tgid_attr_inode_operations;
1625 inode->i_fop = &proc_tgid_attr_operations;
1626 break;
1627 case PROC_TID_ATTR_CURRENT:
1628 case PROC_TGID_ATTR_CURRENT:
1629 case PROC_TID_ATTR_PREV:
1630 case PROC_TGID_ATTR_PREV:
1631 case PROC_TID_ATTR_EXEC:
1632 case PROC_TGID_ATTR_EXEC:
1633 case PROC_TID_ATTR_FSCREATE:
1634 case PROC_TGID_ATTR_FSCREATE:
1635 inode->i_fop = &proc_pid_attr_operations;
1636 break;
1637 #endif
1638 #ifdef CONFIG_KALLSYMS
1639 case PROC_TID_WCHAN:
1640 case PROC_TGID_WCHAN:
1641 inode->i_fop = &proc_info_file_operations;
1642 ei->op.proc_read = proc_pid_wchan;
1643 break;
1644 #endif
1645 #ifdef CONFIG_SCHEDSTATS
1646 case PROC_TID_SCHEDSTAT:
1647 case PROC_TGID_SCHEDSTAT:
1648 inode->i_fop = &proc_info_file_operations;
1649 ei->op.proc_read = proc_pid_schedstat;
1650 break;
1651 #endif
1652 #ifdef CONFIG_CPUSETS
1653 case PROC_TID_CPUSET:
1654 case PROC_TGID_CPUSET:
1655 inode->i_fop = &proc_cpuset_operations;
1656 break;
1657 #endif
1658 case PROC_TID_OOM_SCORE:
1659 case PROC_TGID_OOM_SCORE:
1660 inode->i_fop = &proc_info_file_operations;
1661 ei->op.proc_read = proc_oom_score;
1662 break;
1663 case PROC_TID_OOM_ADJUST:
1664 case PROC_TGID_OOM_ADJUST:
1665 inode->i_fop = &proc_oom_adjust_operations;
1666 break;
1667 #ifdef CONFIG_AUDITSYSCALL
1668 case PROC_TID_LOGINUID:
1669 case PROC_TGID_LOGINUID:
1670 inode->i_fop = &proc_loginuid_operations;
1671 break;
1672 #endif
1673 default:
1674 printk("procfs: impossible type (%d)",p->type);
1675 iput(inode);
1676 return ERR_PTR(-EINVAL);
1677 }
1678 dentry->d_op = &pid_dentry_operations;
1679 d_add(dentry, inode);
1680 return NULL;
1681
1682 out:
1683 return ERR_PTR(error);
1684 }
1685
1686 static struct dentry *proc_tgid_base_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd){
1687 return proc_pident_lookup(dir, dentry, tgid_base_stuff);
1688 }
1689
1690 static struct dentry *proc_tid_base_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd){
1691 return proc_pident_lookup(dir, dentry, tid_base_stuff);
1692 }
1693
1694 static struct file_operations proc_tgid_base_operations = {
1695 .read = generic_read_dir,
1696 .readdir = proc_tgid_base_readdir,
1697 };
1698
1699 static struct file_operations proc_tid_base_operations = {
1700 .read = generic_read_dir,
1701 .readdir = proc_tid_base_readdir,
1702 };
1703
1704 static struct inode_operations proc_tgid_base_inode_operations = {
1705 .lookup = proc_tgid_base_lookup,
1706 };
1707
1708 static struct inode_operations proc_tid_base_inode_operations = {
1709 .lookup = proc_tid_base_lookup,
1710 };
1711
1712 #ifdef CONFIG_SECURITY
1713 static int proc_tgid_attr_readdir(struct file * filp,
1714 void * dirent, filldir_t filldir)
1715 {
1716 return proc_pident_readdir(filp,dirent,filldir,
1717 tgid_attr_stuff,ARRAY_SIZE(tgid_attr_stuff));
1718 }
1719
1720 static int proc_tid_attr_readdir(struct file * filp,
1721 void * dirent, filldir_t filldir)
1722 {
1723 return proc_pident_readdir(filp,dirent,filldir,
1724 tid_attr_stuff,ARRAY_SIZE(tid_attr_stuff));
1725 }
1726
1727 static struct file_operations proc_tgid_attr_operations = {
1728 .read = generic_read_dir,
1729 .readdir = proc_tgid_attr_readdir,
1730 };
1731
1732 static struct file_operations proc_tid_attr_operations = {
1733 .read = generic_read_dir,
1734 .readdir = proc_tid_attr_readdir,
1735 };
1736
1737 static struct dentry *proc_tgid_attr_lookup(struct inode *dir,
1738 struct dentry *dentry, struct nameidata *nd)
1739 {
1740 return proc_pident_lookup(dir, dentry, tgid_attr_stuff);
1741 }
1742
1743 static struct dentry *proc_tid_attr_lookup(struct inode *dir,
1744 struct dentry *dentry, struct nameidata *nd)
1745 {
1746 return proc_pident_lookup(dir, dentry, tid_attr_stuff);
1747 }
1748
1749 static struct inode_operations proc_tgid_attr_inode_operations = {
1750 .lookup = proc_tgid_attr_lookup,
1751 };
1752
1753 static struct inode_operations proc_tid_attr_inode_operations = {
1754 .lookup = proc_tid_attr_lookup,
1755 };
1756 #endif
1757
1758 /*
1759 * /proc/self:
1760 */
1761 static int proc_self_readlink(struct dentry *dentry, char __user *buffer,
1762 int buflen)
1763 {
1764 char tmp[30];
1765 sprintf(tmp, "%d", current->tgid);
1766 return vfs_readlink(dentry,buffer,buflen,tmp);
1767 }
1768
1769 static void *proc_self_follow_link(struct dentry *dentry, struct nameidata *nd)
1770 {
1771 char tmp[30];
1772 sprintf(tmp, "%d", current->tgid);
1773 return ERR_PTR(vfs_follow_link(nd,tmp));
1774 }
1775
1776 static struct inode_operations proc_self_inode_operations = {
1777 .readlink = proc_self_readlink,
1778 .follow_link = proc_self_follow_link,
1779 };
1780
1781 /**
1782 * proc_pid_unhash - Unhash /proc/@pid entry from the dcache.
1783 * @p: task that should be flushed.
1784 *
1785 * Drops the /proc/@pid dcache entry from the hash chains.
1786 *
1787 * Dropping /proc/@pid entries and detach_pid must be synchroneous,
1788 * otherwise e.g. /proc/@pid/exe might point to the wrong executable,
1789 * if the pid value is immediately reused. This is enforced by
1790 * - caller must acquire spin_lock(p->proc_lock)
1791 * - must be called before detach_pid()
1792 * - proc_pid_lookup acquires proc_lock, and checks that
1793 * the target is not dead by looking at the attach count
1794 * of PIDTYPE_PID.
1795 */
1796
1797 struct dentry *proc_pid_unhash(struct task_struct *p)
1798 {
1799 struct dentry *proc_dentry;
1800
1801 proc_dentry = p->proc_dentry;
1802 if (proc_dentry != NULL) {
1803
1804 spin_lock(&dcache_lock);
1805 spin_lock(&proc_dentry->d_lock);
1806 if (!d_unhashed(proc_dentry)) {
1807 dget_locked(proc_dentry);
1808 __d_drop(proc_dentry);
1809 spin_unlock(&proc_dentry->d_lock);
1810 } else {
1811 spin_unlock(&proc_dentry->d_lock);
1812 proc_dentry = NULL;
1813 }
1814 spin_unlock(&dcache_lock);
1815 }
1816 return proc_dentry;
1817 }
1818
1819 /**
1820 * proc_pid_flush - recover memory used by stale /proc/@pid/x entries
1821 * @proc_dentry: directoy to prune.
1822 *
1823 * Shrink the /proc directory that was used by the just killed thread.
1824 */
1825
1826 void proc_pid_flush(struct dentry *proc_dentry)
1827 {
1828 might_sleep();
1829 if(proc_dentry != NULL) {
1830 shrink_dcache_parent(proc_dentry);
1831 dput(proc_dentry);
1832 }
1833 }
1834
1835 /* SMP-safe */
1836 struct dentry *proc_pid_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd)
1837 {
1838 struct task_struct *task;
1839 struct inode *inode;
1840 struct proc_inode *ei;
1841 unsigned tgid;
1842 int died;
1843
1844 if (dentry->d_name.len == 4 && !memcmp(dentry->d_name.name,"self",4)) {
1845 inode = new_inode(dir->i_sb);
1846 if (!inode)
1847 return ERR_PTR(-ENOMEM);
1848 ei = PROC_I(inode);
1849 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
1850 inode->i_ino = fake_ino(0, PROC_TGID_INO);
1851 ei->pde = NULL;
1852 inode->i_mode = S_IFLNK|S_IRWXUGO;
1853 inode->i_uid = inode->i_gid = 0;
1854 inode->i_size = 64;
1855 inode->i_op = &proc_self_inode_operations;
1856 d_add(dentry, inode);
1857 return NULL;
1858 }
1859 tgid = name_to_int(dentry);
1860 if (tgid == ~0U)
1861 goto out;
1862
1863 read_lock(&tasklist_lock);
1864 task = find_task_by_pid(tgid);
1865 if (task)
1866 get_task_struct(task);
1867 read_unlock(&tasklist_lock);
1868 if (!task)
1869 goto out;
1870
1871 inode = proc_pid_make_inode(dir->i_sb, task, PROC_TGID_INO);
1872
1873
1874 if (!inode) {
1875 put_task_struct(task);
1876 goto out;
1877 }
1878 inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO;
1879 inode->i_op = &proc_tgid_base_inode_operations;
1880 inode->i_fop = &proc_tgid_base_operations;
1881 inode->i_flags|=S_IMMUTABLE;
1882 #ifdef CONFIG_SECURITY
1883 inode->i_nlink = 5;
1884 #else
1885 inode->i_nlink = 4;
1886 #endif
1887
1888 dentry->d_op = &pid_base_dentry_operations;
1889
1890 died = 0;
1891 d_add(dentry, inode);
1892 spin_lock(&task->proc_lock);
1893 task->proc_dentry = dentry;
1894 if (!pid_alive(task)) {
1895 dentry = proc_pid_unhash(task);
1896 died = 1;
1897 }
1898 spin_unlock(&task->proc_lock);
1899
1900 put_task_struct(task);
1901 if (died) {
1902 proc_pid_flush(dentry);
1903 goto out;
1904 }
1905 return NULL;
1906 out:
1907 return ERR_PTR(-ENOENT);
1908 }
1909
1910 /* SMP-safe */
1911 static struct dentry *proc_task_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd)
1912 {
1913 struct task_struct *task;
1914 struct task_struct *leader = proc_task(dir);
1915 struct inode *inode;
1916 unsigned tid;
1917
1918 tid = name_to_int(dentry);
1919 if (tid == ~0U)
1920 goto out;
1921
1922 read_lock(&tasklist_lock);
1923 task = find_task_by_pid(tid);
1924 if (task)
1925 get_task_struct(task);
1926 read_unlock(&tasklist_lock);
1927 if (!task)
1928 goto out;
1929 if (leader->tgid != task->tgid)
1930 goto out_drop_task;
1931
1932 inode = proc_pid_make_inode(dir->i_sb, task, PROC_TID_INO);
1933
1934
1935 if (!inode)
1936 goto out_drop_task;
1937 inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO;
1938 inode->i_op = &proc_tid_base_inode_operations;
1939 inode->i_fop = &proc_tid_base_operations;
1940 inode->i_flags|=S_IMMUTABLE;
1941 #ifdef CONFIG_SECURITY
1942 inode->i_nlink = 4;
1943 #else
1944 inode->i_nlink = 3;
1945 #endif
1946
1947 dentry->d_op = &pid_base_dentry_operations;
1948
1949 d_add(dentry, inode);
1950
1951 put_task_struct(task);
1952 return NULL;
1953 out_drop_task:
1954 put_task_struct(task);
1955 out:
1956 return ERR_PTR(-ENOENT);
1957 }
1958
1959 #define PROC_NUMBUF 10
1960 #define PROC_MAXPIDS 20
1961
1962 /*
1963 * Get a few tgid's to return for filldir - we need to hold the
1964 * tasklist lock while doing this, and we must release it before
1965 * we actually do the filldir itself, so we use a temp buffer..
1966 */
1967 static int get_tgid_list(int index, unsigned long version, unsigned int *tgids)
1968 {
1969 struct task_struct *p;
1970 int nr_tgids = 0;
1971
1972 index--;
1973 read_lock(&tasklist_lock);
1974 p = NULL;
1975 if (version) {
1976 p = find_task_by_pid(version);
1977 if (p && !thread_group_leader(p))
1978 p = NULL;
1979 }
1980
1981 if (p)
1982 index = 0;
1983 else
1984 p = next_task(&init_task);
1985
1986 for ( ; p != &init_task; p = next_task(p)) {
1987 int tgid = p->pid;
1988 if (!pid_alive(p))
1989 continue;
1990 if (--index >= 0)
1991 continue;
1992 tgids[nr_tgids] = tgid;
1993 nr_tgids++;
1994 if (nr_tgids >= PROC_MAXPIDS)
1995 break;
1996 }
1997 read_unlock(&tasklist_lock);
1998 return nr_tgids;
1999 }
2000
2001 /*
2002 * Get a few tid's to return for filldir - we need to hold the
2003 * tasklist lock while doing this, and we must release it before
2004 * we actually do the filldir itself, so we use a temp buffer..
2005 */
2006 static int get_tid_list(int index, unsigned int *tids, struct inode *dir)
2007 {
2008 struct task_struct *leader_task = proc_task(dir);
2009 struct task_struct *task = leader_task;
2010 int nr_tids = 0;
2011
2012 index -= 2;
2013 read_lock(&tasklist_lock);
2014 /*
2015 * The starting point task (leader_task) might be an already
2016 * unlinked task, which cannot be used to access the task-list
2017 * via next_thread().
2018 */
2019 if (pid_alive(task)) do {
2020 int tid = task->pid;
2021
2022 if (--index >= 0)
2023 continue;
2024 if (tids != NULL)
2025 tids[nr_tids] = tid;
2026 nr_tids++;
2027 if (nr_tids >= PROC_MAXPIDS)
2028 break;
2029 } while ((task = next_thread(task)) != leader_task);
2030 read_unlock(&tasklist_lock);
2031 return nr_tids;
2032 }
2033
2034 /* for the /proc/ directory itself, after non-process stuff has been done */
2035 int proc_pid_readdir(struct file * filp, void * dirent, filldir_t filldir)
2036 {
2037 unsigned int tgid_array[PROC_MAXPIDS];
2038 char buf[PROC_NUMBUF];
2039 unsigned int nr = filp->f_pos - FIRST_PROCESS_ENTRY;
2040 unsigned int nr_tgids, i;
2041 int next_tgid;
2042
2043 if (!nr) {
2044 ino_t ino = fake_ino(0,PROC_TGID_INO);
2045 if (filldir(dirent, "self", 4, filp->f_pos, ino, DT_LNK) < 0)
2046 return 0;
2047 filp->f_pos++;
2048 nr++;
2049 }
2050
2051 /* f_version caches the tgid value that the last readdir call couldn't
2052 * return. lseek aka telldir automagically resets f_version to 0.
2053 */
2054 next_tgid = filp->f_version;
2055 filp->f_version = 0;
2056 for (;;) {
2057 nr_tgids = get_tgid_list(nr, next_tgid, tgid_array);
2058 if (!nr_tgids) {
2059 /* no more entries ! */
2060 break;
2061 }
2062 next_tgid = 0;
2063
2064 /* do not use the last found pid, reserve it for next_tgid */
2065 if (nr_tgids == PROC_MAXPIDS) {
2066 nr_tgids--;
2067 next_tgid = tgid_array[nr_tgids];
2068 }
2069
2070 for (i=0;i<nr_tgids;i++) {
2071 int tgid = tgid_array[i];
2072 ino_t ino = fake_ino(tgid,PROC_TGID_INO);
2073 unsigned long j = PROC_NUMBUF;
2074
2075 do
2076 buf[--j] = '0' + (tgid % 10);
2077 while ((tgid /= 10) != 0);
2078
2079 if (filldir(dirent, buf+j, PROC_NUMBUF-j, filp->f_pos, ino, DT_DIR) < 0) {
2080 /* returning this tgid failed, save it as the first
2081 * pid for the next readir call */
2082 filp->f_version = tgid_array[i];
2083 goto out;
2084 }
2085 filp->f_pos++;
2086 nr++;
2087 }
2088 }
2089 out:
2090 return 0;
2091 }
2092
2093 /* for the /proc/TGID/task/ directories */
2094 static int proc_task_readdir(struct file * filp, void * dirent, filldir_t filldir)
2095 {
2096 unsigned int tid_array[PROC_MAXPIDS];
2097 char buf[PROC_NUMBUF];
2098 unsigned int nr_tids, i;
2099 struct dentry *dentry = filp->f_dentry;
2100 struct inode *inode = dentry->d_inode;
2101 int retval = -ENOENT;
2102 ino_t ino;
2103 unsigned long pos = filp->f_pos; /* avoiding "long long" filp->f_pos */
2104
2105 if (!pid_alive(proc_task(inode)))
2106 goto out;
2107 retval = 0;
2108
2109 switch (pos) {
2110 case 0:
2111 ino = inode->i_ino;
2112 if (filldir(dirent, ".", 1, pos, ino, DT_DIR) < 0)
2113 goto out;
2114 pos++;
2115 /* fall through */
2116 case 1:
2117 ino = parent_ino(dentry);
2118 if (filldir(dirent, "..", 2, pos, ino, DT_DIR) < 0)
2119 goto out;
2120 pos++;
2121 /* fall through */
2122 }
2123
2124 nr_tids = get_tid_list(pos, tid_array, inode);
2125 inode->i_nlink = pos + nr_tids;
2126
2127 for (i = 0; i < nr_tids; i++) {
2128 unsigned long j = PROC_NUMBUF;
2129 int tid = tid_array[i];
2130
2131 ino = fake_ino(tid,PROC_TID_INO);
2132
2133 do
2134 buf[--j] = '0' + (tid % 10);
2135 while ((tid /= 10) != 0);
2136
2137 if (filldir(dirent, buf+j, PROC_NUMBUF-j, pos, ino, DT_DIR) < 0)
2138 break;
2139 pos++;
2140 }
2141 out:
2142 filp->f_pos = pos;
2143 return retval;
2144 }
linux v2.6.22.y-op