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