Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * linux/fs/proc/base.c | |
3 | * | |
4 | * Copyright (C) 1991, 1992 Linus Torvalds | |
5 | * | |
6 | * proc base directory handling functions | |
7 | * | |
8 | * 1999, Al Viro. Rewritten. Now it covers the whole per-process part. | |
9 | * Instead of using magical inumbers to determine the kind of object | |
10 | * we allocate and fill in-core inodes upon lookup. They don't even | |
11 | * go into icache. We cache the reference to task_struct upon lookup too. | |
12 | * Eventually it should become a filesystem in its own. We don't use the | |
13 | * rest of procfs anymore. | |
e070ad49 ML |
14 | * |
15 | * | |
16 | * Changelog: | |
17 | * 17-Jan-2005 | |
18 | * Allan Bezerra | |
19 | * Bruna Moreira <bruna.moreira@indt.org.br> | |
20 | * Edjard Mota <edjard.mota@indt.org.br> | |
21 | * Ilias Biris <ilias.biris@indt.org.br> | |
22 | * Mauricio Lin <mauricio.lin@indt.org.br> | |
23 | * | |
24 | * Embedded Linux Lab - 10LE Instituto Nokia de Tecnologia - INdT | |
25 | * | |
26 | * A new process specific entry (smaps) included in /proc. It shows the | |
27 | * size of rss for each memory area. The maps entry lacks information | |
28 | * about physical memory size (rss) for each mapped file, i.e., | |
29 | * rss information for executables and library files. | |
30 | * This additional information is useful for any tools that need to know | |
31 | * about physical memory consumption for a process specific library. | |
32 | * | |
33 | * Changelog: | |
34 | * 21-Feb-2005 | |
35 | * Embedded Linux Lab - 10LE Instituto Nokia de Tecnologia - INdT | |
36 | * Pud inclusion in the page table walking. | |
37 | * | |
38 | * ChangeLog: | |
39 | * 10-Mar-2005 | |
40 | * 10LE Instituto Nokia de Tecnologia - INdT: | |
41 | * A better way to walks through the page table as suggested by Hugh Dickins. | |
42 | * | |
43 | * Simo Piiroinen <simo.piiroinen@nokia.com>: | |
44 | * Smaps information related to shared, private, clean and dirty pages. | |
45 | * | |
46 | * Paul Mundt <paul.mundt@nokia.com>: | |
47 | * Overall revision about smaps. | |
1da177e4 LT |
48 | */ |
49 | ||
50 | #include <asm/uaccess.h> | |
51 | ||
1da177e4 LT |
52 | #include <linux/errno.h> |
53 | #include <linux/time.h> | |
54 | #include <linux/proc_fs.h> | |
55 | #include <linux/stat.h> | |
56 | #include <linux/init.h> | |
16f7e0fe | 57 | #include <linux/capability.h> |
1da177e4 LT |
58 | #include <linux/file.h> |
59 | #include <linux/string.h> | |
60 | #include <linux/seq_file.h> | |
61 | #include <linux/namei.h> | |
6b3286ed | 62 | #include <linux/mnt_namespace.h> |
1da177e4 | 63 | #include <linux/mm.h> |
b835996f | 64 | #include <linux/rcupdate.h> |
1da177e4 | 65 | #include <linux/kallsyms.h> |
d85f50d5 | 66 | #include <linux/resource.h> |
5096add8 | 67 | #include <linux/module.h> |
1da177e4 LT |
68 | #include <linux/mount.h> |
69 | #include <linux/security.h> | |
70 | #include <linux/ptrace.h> | |
a424316c | 71 | #include <linux/cgroup.h> |
1da177e4 LT |
72 | #include <linux/cpuset.h> |
73 | #include <linux/audit.h> | |
5addc5dd | 74 | #include <linux/poll.h> |
1651e14e | 75 | #include <linux/nsproxy.h> |
8ac773b4 | 76 | #include <linux/oom.h> |
3cb4a0bb | 77 | #include <linux/elf.h> |
60347f67 | 78 | #include <linux/pid_namespace.h> |
1da177e4 LT |
79 | #include "internal.h" |
80 | ||
0f2fe20f EB |
81 | /* NOTE: |
82 | * Implementing inode permission operations in /proc is almost | |
83 | * certainly an error. Permission checks need to happen during | |
84 | * each system call not at open time. The reason is that most of | |
85 | * what we wish to check for permissions in /proc varies at runtime. | |
86 | * | |
87 | * The classic example of a problem is opening file descriptors | |
88 | * in /proc for a task before it execs a suid executable. | |
89 | */ | |
90 | ||
1da177e4 | 91 | struct pid_entry { |
1da177e4 | 92 | char *name; |
c5141e6d | 93 | int len; |
1da177e4 | 94 | mode_t mode; |
c5ef1c42 | 95 | const struct inode_operations *iop; |
00977a59 | 96 | const struct file_operations *fop; |
20cdc894 | 97 | union proc_op op; |
1da177e4 LT |
98 | }; |
99 | ||
61a28784 | 100 | #define NOD(NAME, MODE, IOP, FOP, OP) { \ |
20cdc894 | 101 | .name = (NAME), \ |
c5141e6d | 102 | .len = sizeof(NAME) - 1, \ |
20cdc894 EB |
103 | .mode = MODE, \ |
104 | .iop = IOP, \ | |
105 | .fop = FOP, \ | |
106 | .op = OP, \ | |
107 | } | |
108 | ||
61a28784 EB |
109 | #define DIR(NAME, MODE, OTYPE) \ |
110 | NOD(NAME, (S_IFDIR|(MODE)), \ | |
20cdc894 EB |
111 | &proc_##OTYPE##_inode_operations, &proc_##OTYPE##_operations, \ |
112 | {} ) | |
61a28784 EB |
113 | #define LNK(NAME, OTYPE) \ |
114 | NOD(NAME, (S_IFLNK|S_IRWXUGO), \ | |
20cdc894 EB |
115 | &proc_pid_link_inode_operations, NULL, \ |
116 | { .proc_get_link = &proc_##OTYPE##_link } ) | |
61a28784 EB |
117 | #define REG(NAME, MODE, OTYPE) \ |
118 | NOD(NAME, (S_IFREG|(MODE)), NULL, \ | |
20cdc894 | 119 | &proc_##OTYPE##_operations, {}) |
61a28784 EB |
120 | #define INF(NAME, MODE, OTYPE) \ |
121 | NOD(NAME, (S_IFREG|(MODE)), \ | |
20cdc894 EB |
122 | NULL, &proc_info_file_operations, \ |
123 | { .proc_read = &proc_##OTYPE } ) | |
be614086 EB |
124 | #define ONE(NAME, MODE, OTYPE) \ |
125 | NOD(NAME, (S_IFREG|(MODE)), \ | |
126 | NULL, &proc_single_file_operations, \ | |
127 | { .proc_show = &proc_##OTYPE } ) | |
1da177e4 | 128 | |
5096add8 KC |
129 | int maps_protect; |
130 | EXPORT_SYMBOL(maps_protect); | |
131 | ||
0494f6ec | 132 | static struct fs_struct *get_fs_struct(struct task_struct *task) |
1da177e4 LT |
133 | { |
134 | struct fs_struct *fs; | |
0494f6ec MS |
135 | task_lock(task); |
136 | fs = task->fs; | |
1da177e4 LT |
137 | if(fs) |
138 | atomic_inc(&fs->count); | |
0494f6ec MS |
139 | task_unlock(task); |
140 | return fs; | |
141 | } | |
142 | ||
99f89551 EB |
143 | static int get_nr_threads(struct task_struct *tsk) |
144 | { | |
145 | /* Must be called with the rcu_read_lock held */ | |
146 | unsigned long flags; | |
147 | int count = 0; | |
148 | ||
149 | if (lock_task_sighand(tsk, &flags)) { | |
150 | count = atomic_read(&tsk->signal->count); | |
151 | unlock_task_sighand(tsk, &flags); | |
152 | } | |
153 | return count; | |
154 | } | |
155 | ||
0494f6ec MS |
156 | static int proc_cwd_link(struct inode *inode, struct dentry **dentry, struct vfsmount **mnt) |
157 | { | |
99f89551 EB |
158 | struct task_struct *task = get_proc_task(inode); |
159 | struct fs_struct *fs = NULL; | |
0494f6ec | 160 | int result = -ENOENT; |
99f89551 EB |
161 | |
162 | if (task) { | |
163 | fs = get_fs_struct(task); | |
164 | put_task_struct(task); | |
165 | } | |
1da177e4 LT |
166 | if (fs) { |
167 | read_lock(&fs->lock); | |
168 | *mnt = mntget(fs->pwdmnt); | |
169 | *dentry = dget(fs->pwd); | |
170 | read_unlock(&fs->lock); | |
171 | result = 0; | |
172 | put_fs_struct(fs); | |
173 | } | |
174 | return result; | |
175 | } | |
176 | ||
177 | static int proc_root_link(struct inode *inode, struct dentry **dentry, struct vfsmount **mnt) | |
178 | { | |
99f89551 EB |
179 | struct task_struct *task = get_proc_task(inode); |
180 | struct fs_struct *fs = NULL; | |
1da177e4 | 181 | int result = -ENOENT; |
99f89551 EB |
182 | |
183 | if (task) { | |
184 | fs = get_fs_struct(task); | |
185 | put_task_struct(task); | |
186 | } | |
1da177e4 LT |
187 | if (fs) { |
188 | read_lock(&fs->lock); | |
189 | *mnt = mntget(fs->rootmnt); | |
190 | *dentry = dget(fs->root); | |
191 | read_unlock(&fs->lock); | |
192 | result = 0; | |
193 | put_fs_struct(fs); | |
194 | } | |
195 | return result; | |
196 | } | |
197 | ||
198 | #define MAY_PTRACE(task) \ | |
199 | (task == current || \ | |
200 | (task->parent == current && \ | |
201 | (task->ptrace & PT_PTRACED) && \ | |
6d8982d9 | 202 | (task_is_stopped_or_traced(task)) && \ |
1da177e4 LT |
203 | security_ptrace(current,task) == 0)) |
204 | ||
831830b5 AV |
205 | struct mm_struct *mm_for_maps(struct task_struct *task) |
206 | { | |
207 | struct mm_struct *mm = get_task_mm(task); | |
208 | if (!mm) | |
209 | return NULL; | |
210 | down_read(&mm->mmap_sem); | |
211 | task_lock(task); | |
212 | if (task->mm != mm) | |
213 | goto out; | |
214 | if (task->mm != current->mm && __ptrace_may_attach(task) < 0) | |
215 | goto out; | |
216 | task_unlock(task); | |
217 | return mm; | |
218 | out: | |
219 | task_unlock(task); | |
220 | up_read(&mm->mmap_sem); | |
221 | mmput(mm); | |
222 | return NULL; | |
223 | } | |
224 | ||
1da177e4 LT |
225 | static int proc_pid_cmdline(struct task_struct *task, char * buffer) |
226 | { | |
227 | int res = 0; | |
228 | unsigned int len; | |
229 | struct mm_struct *mm = get_task_mm(task); | |
230 | if (!mm) | |
231 | goto out; | |
232 | if (!mm->arg_end) | |
233 | goto out_mm; /* Shh! No looking before we're done */ | |
234 | ||
235 | len = mm->arg_end - mm->arg_start; | |
236 | ||
237 | if (len > PAGE_SIZE) | |
238 | len = PAGE_SIZE; | |
239 | ||
240 | res = access_process_vm(task, mm->arg_start, buffer, len, 0); | |
241 | ||
242 | // If the nul at the end of args has been overwritten, then | |
243 | // assume application is using setproctitle(3). | |
244 | if (res > 0 && buffer[res-1] != '\0' && len < PAGE_SIZE) { | |
245 | len = strnlen(buffer, res); | |
246 | if (len < res) { | |
247 | res = len; | |
248 | } else { | |
249 | len = mm->env_end - mm->env_start; | |
250 | if (len > PAGE_SIZE - res) | |
251 | len = PAGE_SIZE - res; | |
252 | res += access_process_vm(task, mm->env_start, buffer+res, len, 0); | |
253 | res = strnlen(buffer, res); | |
254 | } | |
255 | } | |
256 | out_mm: | |
257 | mmput(mm); | |
258 | out: | |
259 | return res; | |
260 | } | |
261 | ||
262 | static int proc_pid_auxv(struct task_struct *task, char *buffer) | |
263 | { | |
264 | int res = 0; | |
265 | struct mm_struct *mm = get_task_mm(task); | |
266 | if (mm) { | |
267 | unsigned int nwords = 0; | |
268 | do | |
269 | nwords += 2; | |
270 | while (mm->saved_auxv[nwords - 2] != 0); /* AT_NULL */ | |
271 | res = nwords * sizeof(mm->saved_auxv[0]); | |
272 | if (res > PAGE_SIZE) | |
273 | res = PAGE_SIZE; | |
274 | memcpy(buffer, mm->saved_auxv, res); | |
275 | mmput(mm); | |
276 | } | |
277 | return res; | |
278 | } | |
279 | ||
280 | ||
281 | #ifdef CONFIG_KALLSYMS | |
282 | /* | |
283 | * Provides a wchan file via kallsyms in a proper one-value-per-file format. | |
284 | * Returns the resolved symbol. If that fails, simply return the address. | |
285 | */ | |
286 | static int proc_pid_wchan(struct task_struct *task, char *buffer) | |
287 | { | |
ffb45122 | 288 | unsigned long wchan; |
9281acea | 289 | char symname[KSYM_NAME_LEN]; |
1da177e4 LT |
290 | |
291 | wchan = get_wchan(task); | |
292 | ||
9d65cb4a AD |
293 | if (lookup_symbol_name(wchan, symname) < 0) |
294 | return sprintf(buffer, "%lu", wchan); | |
295 | else | |
296 | return sprintf(buffer, "%s", symname); | |
1da177e4 LT |
297 | } |
298 | #endif /* CONFIG_KALLSYMS */ | |
299 | ||
300 | #ifdef CONFIG_SCHEDSTATS | |
301 | /* | |
302 | * Provides /proc/PID/schedstat | |
303 | */ | |
304 | static int proc_pid_schedstat(struct task_struct *task, char *buffer) | |
305 | { | |
172ba844 | 306 | return sprintf(buffer, "%llu %llu %lu\n", |
1da177e4 LT |
307 | task->sched_info.cpu_time, |
308 | task->sched_info.run_delay, | |
2d72376b | 309 | task->sched_info.pcount); |
1da177e4 LT |
310 | } |
311 | #endif | |
312 | ||
9745512c AV |
313 | #ifdef CONFIG_LATENCYTOP |
314 | static int lstats_show_proc(struct seq_file *m, void *v) | |
315 | { | |
316 | int i; | |
317 | struct task_struct *task = m->private; | |
318 | seq_puts(m, "Latency Top version : v0.1\n"); | |
319 | ||
320 | for (i = 0; i < 32; i++) { | |
321 | if (task->latency_record[i].backtrace[0]) { | |
322 | int q; | |
323 | seq_printf(m, "%i %li %li ", | |
324 | task->latency_record[i].count, | |
325 | task->latency_record[i].time, | |
326 | task->latency_record[i].max); | |
327 | for (q = 0; q < LT_BACKTRACEDEPTH; q++) { | |
328 | char sym[KSYM_NAME_LEN]; | |
329 | char *c; | |
330 | if (!task->latency_record[i].backtrace[q]) | |
331 | break; | |
332 | if (task->latency_record[i].backtrace[q] == ULONG_MAX) | |
333 | break; | |
334 | sprint_symbol(sym, task->latency_record[i].backtrace[q]); | |
335 | c = strchr(sym, '+'); | |
336 | if (c) | |
337 | *c = 0; | |
338 | seq_printf(m, "%s ", sym); | |
339 | } | |
340 | seq_printf(m, "\n"); | |
341 | } | |
342 | ||
343 | } | |
344 | return 0; | |
345 | } | |
346 | ||
347 | static int lstats_open(struct inode *inode, struct file *file) | |
348 | { | |
349 | int ret; | |
350 | struct seq_file *m; | |
351 | struct task_struct *task = get_proc_task(inode); | |
352 | ||
353 | ret = single_open(file, lstats_show_proc, NULL); | |
354 | if (!ret) { | |
355 | m = file->private_data; | |
356 | m->private = task; | |
357 | } | |
358 | return ret; | |
359 | } | |
360 | ||
361 | static ssize_t lstats_write(struct file *file, const char __user *buf, | |
362 | size_t count, loff_t *offs) | |
363 | { | |
364 | struct seq_file *m; | |
365 | struct task_struct *task; | |
366 | ||
367 | m = file->private_data; | |
368 | task = m->private; | |
369 | clear_all_latency_tracing(task); | |
370 | ||
371 | return count; | |
372 | } | |
373 | ||
374 | static const struct file_operations proc_lstats_operations = { | |
375 | .open = lstats_open, | |
376 | .read = seq_read, | |
377 | .write = lstats_write, | |
378 | .llseek = seq_lseek, | |
379 | .release = single_release, | |
380 | }; | |
381 | ||
382 | #endif | |
383 | ||
1da177e4 LT |
384 | /* The badness from the OOM killer */ |
385 | unsigned long badness(struct task_struct *p, unsigned long uptime); | |
386 | static int proc_oom_score(struct task_struct *task, char *buffer) | |
387 | { | |
388 | unsigned long points; | |
389 | struct timespec uptime; | |
390 | ||
391 | do_posix_clock_monotonic_gettime(&uptime); | |
19c5d45a | 392 | read_lock(&tasklist_lock); |
1da177e4 | 393 | points = badness(task, uptime.tv_sec); |
19c5d45a | 394 | read_unlock(&tasklist_lock); |
1da177e4 LT |
395 | return sprintf(buffer, "%lu\n", points); |
396 | } | |
397 | ||
d85f50d5 NH |
398 | struct limit_names { |
399 | char *name; | |
400 | char *unit; | |
401 | }; | |
402 | ||
403 | static const struct limit_names lnames[RLIM_NLIMITS] = { | |
404 | [RLIMIT_CPU] = {"Max cpu time", "ms"}, | |
405 | [RLIMIT_FSIZE] = {"Max file size", "bytes"}, | |
406 | [RLIMIT_DATA] = {"Max data size", "bytes"}, | |
407 | [RLIMIT_STACK] = {"Max stack size", "bytes"}, | |
408 | [RLIMIT_CORE] = {"Max core file size", "bytes"}, | |
409 | [RLIMIT_RSS] = {"Max resident set", "bytes"}, | |
410 | [RLIMIT_NPROC] = {"Max processes", "processes"}, | |
411 | [RLIMIT_NOFILE] = {"Max open files", "files"}, | |
412 | [RLIMIT_MEMLOCK] = {"Max locked memory", "bytes"}, | |
413 | [RLIMIT_AS] = {"Max address space", "bytes"}, | |
414 | [RLIMIT_LOCKS] = {"Max file locks", "locks"}, | |
415 | [RLIMIT_SIGPENDING] = {"Max pending signals", "signals"}, | |
416 | [RLIMIT_MSGQUEUE] = {"Max msgqueue size", "bytes"}, | |
417 | [RLIMIT_NICE] = {"Max nice priority", NULL}, | |
418 | [RLIMIT_RTPRIO] = {"Max realtime priority", NULL}, | |
419 | }; | |
420 | ||
421 | /* Display limits for a process */ | |
422 | static int proc_pid_limits(struct task_struct *task, char *buffer) | |
423 | { | |
424 | unsigned int i; | |
425 | int count = 0; | |
426 | unsigned long flags; | |
427 | char *bufptr = buffer; | |
428 | ||
429 | struct rlimit rlim[RLIM_NLIMITS]; | |
430 | ||
431 | rcu_read_lock(); | |
432 | if (!lock_task_sighand(task,&flags)) { | |
433 | rcu_read_unlock(); | |
434 | return 0; | |
435 | } | |
436 | memcpy(rlim, task->signal->rlim, sizeof(struct rlimit) * RLIM_NLIMITS); | |
437 | unlock_task_sighand(task, &flags); | |
438 | rcu_read_unlock(); | |
439 | ||
440 | /* | |
441 | * print the file header | |
442 | */ | |
443 | count += sprintf(&bufptr[count], "%-25s %-20s %-20s %-10s\n", | |
444 | "Limit", "Soft Limit", "Hard Limit", "Units"); | |
445 | ||
446 | for (i = 0; i < RLIM_NLIMITS; i++) { | |
447 | if (rlim[i].rlim_cur == RLIM_INFINITY) | |
448 | count += sprintf(&bufptr[count], "%-25s %-20s ", | |
449 | lnames[i].name, "unlimited"); | |
450 | else | |
451 | count += sprintf(&bufptr[count], "%-25s %-20lu ", | |
452 | lnames[i].name, rlim[i].rlim_cur); | |
453 | ||
454 | if (rlim[i].rlim_max == RLIM_INFINITY) | |
455 | count += sprintf(&bufptr[count], "%-20s ", "unlimited"); | |
456 | else | |
457 | count += sprintf(&bufptr[count], "%-20lu ", | |
458 | rlim[i].rlim_max); | |
459 | ||
460 | if (lnames[i].unit) | |
461 | count += sprintf(&bufptr[count], "%-10s\n", | |
462 | lnames[i].unit); | |
463 | else | |
464 | count += sprintf(&bufptr[count], "\n"); | |
465 | } | |
466 | ||
467 | return count; | |
468 | } | |
469 | ||
1da177e4 LT |
470 | /************************************************************************/ |
471 | /* Here the fs part begins */ | |
472 | /************************************************************************/ | |
473 | ||
474 | /* permission checks */ | |
778c1144 | 475 | static int proc_fd_access_allowed(struct inode *inode) |
1da177e4 | 476 | { |
778c1144 EB |
477 | struct task_struct *task; |
478 | int allowed = 0; | |
df26c40e EB |
479 | /* Allow access to a task's file descriptors if it is us or we |
480 | * may use ptrace attach to the process and find out that | |
481 | * information. | |
778c1144 EB |
482 | */ |
483 | task = get_proc_task(inode); | |
df26c40e EB |
484 | if (task) { |
485 | allowed = ptrace_may_attach(task); | |
778c1144 | 486 | put_task_struct(task); |
df26c40e | 487 | } |
778c1144 | 488 | return allowed; |
1da177e4 LT |
489 | } |
490 | ||
6d76fa58 LT |
491 | static int proc_setattr(struct dentry *dentry, struct iattr *attr) |
492 | { | |
493 | int error; | |
494 | struct inode *inode = dentry->d_inode; | |
495 | ||
496 | if (attr->ia_valid & ATTR_MODE) | |
497 | return -EPERM; | |
498 | ||
499 | error = inode_change_ok(inode, attr); | |
1e8123fd JJ |
500 | if (!error) |
501 | error = inode_setattr(inode, attr); | |
6d76fa58 LT |
502 | return error; |
503 | } | |
504 | ||
c5ef1c42 | 505 | static const struct inode_operations proc_def_inode_operations = { |
6d76fa58 LT |
506 | .setattr = proc_setattr, |
507 | }; | |
508 | ||
03a44825 | 509 | extern const struct seq_operations mounts_op; |
5addc5dd AV |
510 | struct proc_mounts { |
511 | struct seq_file m; | |
512 | int event; | |
513 | }; | |
514 | ||
1da177e4 LT |
515 | static int mounts_open(struct inode *inode, struct file *file) |
516 | { | |
99f89551 | 517 | struct task_struct *task = get_proc_task(inode); |
cf7b708c | 518 | struct nsproxy *nsp; |
6b3286ed | 519 | struct mnt_namespace *ns = NULL; |
5addc5dd AV |
520 | struct proc_mounts *p; |
521 | int ret = -EINVAL; | |
1da177e4 | 522 | |
99f89551 | 523 | if (task) { |
cf7b708c PE |
524 | rcu_read_lock(); |
525 | nsp = task_nsproxy(task); | |
526 | if (nsp) { | |
527 | ns = nsp->mnt_ns; | |
863c4702 AD |
528 | if (ns) |
529 | get_mnt_ns(ns); | |
530 | } | |
cf7b708c PE |
531 | rcu_read_unlock(); |
532 | ||
99f89551 EB |
533 | put_task_struct(task); |
534 | } | |
5addc5dd | 535 | |
6b3286ed | 536 | if (ns) { |
5addc5dd AV |
537 | ret = -ENOMEM; |
538 | p = kmalloc(sizeof(struct proc_mounts), GFP_KERNEL); | |
539 | if (p) { | |
540 | file->private_data = &p->m; | |
541 | ret = seq_open(file, &mounts_op); | |
542 | if (!ret) { | |
6b3286ed KK |
543 | p->m.private = ns; |
544 | p->event = ns->event; | |
5addc5dd AV |
545 | return 0; |
546 | } | |
547 | kfree(p); | |
1da177e4 | 548 | } |
6b3286ed | 549 | put_mnt_ns(ns); |
1da177e4 LT |
550 | } |
551 | return ret; | |
552 | } | |
553 | ||
554 | static int mounts_release(struct inode *inode, struct file *file) | |
555 | { | |
556 | struct seq_file *m = file->private_data; | |
6b3286ed KK |
557 | struct mnt_namespace *ns = m->private; |
558 | put_mnt_ns(ns); | |
1da177e4 LT |
559 | return seq_release(inode, file); |
560 | } | |
561 | ||
5addc5dd AV |
562 | static unsigned mounts_poll(struct file *file, poll_table *wait) |
563 | { | |
564 | struct proc_mounts *p = file->private_data; | |
6b3286ed | 565 | struct mnt_namespace *ns = p->m.private; |
5addc5dd AV |
566 | unsigned res = 0; |
567 | ||
568 | poll_wait(file, &ns->poll, wait); | |
569 | ||
570 | spin_lock(&vfsmount_lock); | |
571 | if (p->event != ns->event) { | |
572 | p->event = ns->event; | |
573 | res = POLLERR; | |
574 | } | |
575 | spin_unlock(&vfsmount_lock); | |
576 | ||
577 | return res; | |
578 | } | |
579 | ||
00977a59 | 580 | static const struct file_operations proc_mounts_operations = { |
1da177e4 LT |
581 | .open = mounts_open, |
582 | .read = seq_read, | |
583 | .llseek = seq_lseek, | |
584 | .release = mounts_release, | |
5addc5dd | 585 | .poll = mounts_poll, |
1da177e4 LT |
586 | }; |
587 | ||
03a44825 | 588 | extern const struct seq_operations mountstats_op; |
b4629fe2 CL |
589 | static int mountstats_open(struct inode *inode, struct file *file) |
590 | { | |
b4629fe2 CL |
591 | int ret = seq_open(file, &mountstats_op); |
592 | ||
593 | if (!ret) { | |
594 | struct seq_file *m = file->private_data; | |
cf7b708c | 595 | struct nsproxy *nsp; |
6b3286ed | 596 | struct mnt_namespace *mnt_ns = NULL; |
99f89551 EB |
597 | struct task_struct *task = get_proc_task(inode); |
598 | ||
599 | if (task) { | |
cf7b708c PE |
600 | rcu_read_lock(); |
601 | nsp = task_nsproxy(task); | |
602 | if (nsp) { | |
603 | mnt_ns = nsp->mnt_ns; | |
604 | if (mnt_ns) | |
605 | get_mnt_ns(mnt_ns); | |
606 | } | |
607 | rcu_read_unlock(); | |
608 | ||
99f89551 EB |
609 | put_task_struct(task); |
610 | } | |
b4629fe2 | 611 | |
6b3286ed KK |
612 | if (mnt_ns) |
613 | m->private = mnt_ns; | |
b4629fe2 CL |
614 | else { |
615 | seq_release(inode, file); | |
616 | ret = -EINVAL; | |
617 | } | |
618 | } | |
619 | return ret; | |
620 | } | |
621 | ||
00977a59 | 622 | static const struct file_operations proc_mountstats_operations = { |
b4629fe2 CL |
623 | .open = mountstats_open, |
624 | .read = seq_read, | |
625 | .llseek = seq_lseek, | |
626 | .release = mounts_release, | |
627 | }; | |
628 | ||
1da177e4 LT |
629 | #define PROC_BLOCK_SIZE (3*1024) /* 4K page size but our output routines use some slack for overruns */ |
630 | ||
631 | static ssize_t proc_info_read(struct file * file, char __user * buf, | |
632 | size_t count, loff_t *ppos) | |
633 | { | |
2fddfeef | 634 | struct inode * inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
635 | unsigned long page; |
636 | ssize_t length; | |
99f89551 EB |
637 | struct task_struct *task = get_proc_task(inode); |
638 | ||
639 | length = -ESRCH; | |
640 | if (!task) | |
641 | goto out_no_task; | |
1da177e4 LT |
642 | |
643 | if (count > PROC_BLOCK_SIZE) | |
644 | count = PROC_BLOCK_SIZE; | |
99f89551 EB |
645 | |
646 | length = -ENOMEM; | |
e12ba74d | 647 | if (!(page = __get_free_page(GFP_TEMPORARY))) |
99f89551 | 648 | goto out; |
1da177e4 LT |
649 | |
650 | length = PROC_I(inode)->op.proc_read(task, (char*)page); | |
651 | ||
652 | if (length >= 0) | |
653 | length = simple_read_from_buffer(buf, count, ppos, (char *)page, length); | |
654 | free_page(page); | |
99f89551 EB |
655 | out: |
656 | put_task_struct(task); | |
657 | out_no_task: | |
1da177e4 LT |
658 | return length; |
659 | } | |
660 | ||
00977a59 | 661 | static const struct file_operations proc_info_file_operations = { |
1da177e4 LT |
662 | .read = proc_info_read, |
663 | }; | |
664 | ||
be614086 EB |
665 | static int proc_single_show(struct seq_file *m, void *v) |
666 | { | |
667 | struct inode *inode = m->private; | |
668 | struct pid_namespace *ns; | |
669 | struct pid *pid; | |
670 | struct task_struct *task; | |
671 | int ret; | |
672 | ||
673 | ns = inode->i_sb->s_fs_info; | |
674 | pid = proc_pid(inode); | |
675 | task = get_pid_task(pid, PIDTYPE_PID); | |
676 | if (!task) | |
677 | return -ESRCH; | |
678 | ||
679 | ret = PROC_I(inode)->op.proc_show(m, ns, pid, task); | |
680 | ||
681 | put_task_struct(task); | |
682 | return ret; | |
683 | } | |
684 | ||
685 | static int proc_single_open(struct inode *inode, struct file *filp) | |
686 | { | |
687 | int ret; | |
688 | ret = single_open(filp, proc_single_show, NULL); | |
689 | if (!ret) { | |
690 | struct seq_file *m = filp->private_data; | |
691 | ||
692 | m->private = inode; | |
693 | } | |
694 | return ret; | |
695 | } | |
696 | ||
697 | static const struct file_operations proc_single_file_operations = { | |
698 | .open = proc_single_open, | |
699 | .read = seq_read, | |
700 | .llseek = seq_lseek, | |
701 | .release = single_release, | |
702 | }; | |
703 | ||
1da177e4 LT |
704 | static int mem_open(struct inode* inode, struct file* file) |
705 | { | |
706 | file->private_data = (void*)((long)current->self_exec_id); | |
707 | return 0; | |
708 | } | |
709 | ||
710 | static ssize_t mem_read(struct file * file, char __user * buf, | |
711 | size_t count, loff_t *ppos) | |
712 | { | |
2fddfeef | 713 | struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode); |
1da177e4 LT |
714 | char *page; |
715 | unsigned long src = *ppos; | |
716 | int ret = -ESRCH; | |
717 | struct mm_struct *mm; | |
718 | ||
99f89551 EB |
719 | if (!task) |
720 | goto out_no_task; | |
721 | ||
ab8d11be | 722 | if (!MAY_PTRACE(task) || !ptrace_may_attach(task)) |
1da177e4 LT |
723 | goto out; |
724 | ||
725 | ret = -ENOMEM; | |
e12ba74d | 726 | page = (char *)__get_free_page(GFP_TEMPORARY); |
1da177e4 LT |
727 | if (!page) |
728 | goto out; | |
729 | ||
730 | ret = 0; | |
731 | ||
732 | mm = get_task_mm(task); | |
733 | if (!mm) | |
734 | goto out_free; | |
735 | ||
736 | ret = -EIO; | |
737 | ||
738 | if (file->private_data != (void*)((long)current->self_exec_id)) | |
739 | goto out_put; | |
740 | ||
741 | ret = 0; | |
742 | ||
743 | while (count > 0) { | |
744 | int this_len, retval; | |
745 | ||
746 | this_len = (count > PAGE_SIZE) ? PAGE_SIZE : count; | |
747 | retval = access_process_vm(task, src, page, this_len, 0); | |
ab8d11be | 748 | if (!retval || !MAY_PTRACE(task) || !ptrace_may_attach(task)) { |
1da177e4 LT |
749 | if (!ret) |
750 | ret = -EIO; | |
751 | break; | |
752 | } | |
753 | ||
754 | if (copy_to_user(buf, page, retval)) { | |
755 | ret = -EFAULT; | |
756 | break; | |
757 | } | |
758 | ||
759 | ret += retval; | |
760 | src += retval; | |
761 | buf += retval; | |
762 | count -= retval; | |
763 | } | |
764 | *ppos = src; | |
765 | ||
766 | out_put: | |
767 | mmput(mm); | |
768 | out_free: | |
769 | free_page((unsigned long) page); | |
770 | out: | |
99f89551 EB |
771 | put_task_struct(task); |
772 | out_no_task: | |
1da177e4 LT |
773 | return ret; |
774 | } | |
775 | ||
776 | #define mem_write NULL | |
777 | ||
778 | #ifndef mem_write | |
779 | /* This is a security hazard */ | |
63967fa9 | 780 | static ssize_t mem_write(struct file * file, const char __user *buf, |
1da177e4 LT |
781 | size_t count, loff_t *ppos) |
782 | { | |
f7ca54f4 | 783 | int copied; |
1da177e4 | 784 | char *page; |
2fddfeef | 785 | struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode); |
1da177e4 LT |
786 | unsigned long dst = *ppos; |
787 | ||
99f89551 EB |
788 | copied = -ESRCH; |
789 | if (!task) | |
790 | goto out_no_task; | |
791 | ||
ab8d11be | 792 | if (!MAY_PTRACE(task) || !ptrace_may_attach(task)) |
99f89551 | 793 | goto out; |
1da177e4 | 794 | |
99f89551 | 795 | copied = -ENOMEM; |
e12ba74d | 796 | page = (char *)__get_free_page(GFP_TEMPORARY); |
1da177e4 | 797 | if (!page) |
99f89551 | 798 | goto out; |
1da177e4 | 799 | |
f7ca54f4 | 800 | copied = 0; |
1da177e4 LT |
801 | while (count > 0) { |
802 | int this_len, retval; | |
803 | ||
804 | this_len = (count > PAGE_SIZE) ? PAGE_SIZE : count; | |
805 | if (copy_from_user(page, buf, this_len)) { | |
806 | copied = -EFAULT; | |
807 | break; | |
808 | } | |
809 | retval = access_process_vm(task, dst, page, this_len, 1); | |
810 | if (!retval) { | |
811 | if (!copied) | |
812 | copied = -EIO; | |
813 | break; | |
814 | } | |
815 | copied += retval; | |
816 | buf += retval; | |
817 | dst += retval; | |
818 | count -= retval; | |
819 | } | |
820 | *ppos = dst; | |
821 | free_page((unsigned long) page); | |
99f89551 EB |
822 | out: |
823 | put_task_struct(task); | |
824 | out_no_task: | |
1da177e4 LT |
825 | return copied; |
826 | } | |
827 | #endif | |
828 | ||
85863e47 | 829 | loff_t mem_lseek(struct file *file, loff_t offset, int orig) |
1da177e4 LT |
830 | { |
831 | switch (orig) { | |
832 | case 0: | |
833 | file->f_pos = offset; | |
834 | break; | |
835 | case 1: | |
836 | file->f_pos += offset; | |
837 | break; | |
838 | default: | |
839 | return -EINVAL; | |
840 | } | |
841 | force_successful_syscall_return(); | |
842 | return file->f_pos; | |
843 | } | |
844 | ||
00977a59 | 845 | static const struct file_operations proc_mem_operations = { |
1da177e4 LT |
846 | .llseek = mem_lseek, |
847 | .read = mem_read, | |
848 | .write = mem_write, | |
849 | .open = mem_open, | |
850 | }; | |
851 | ||
315e28c8 JP |
852 | static ssize_t environ_read(struct file *file, char __user *buf, |
853 | size_t count, loff_t *ppos) | |
854 | { | |
855 | struct task_struct *task = get_proc_task(file->f_dentry->d_inode); | |
856 | char *page; | |
857 | unsigned long src = *ppos; | |
858 | int ret = -ESRCH; | |
859 | struct mm_struct *mm; | |
860 | ||
861 | if (!task) | |
862 | goto out_no_task; | |
863 | ||
864 | if (!ptrace_may_attach(task)) | |
865 | goto out; | |
866 | ||
867 | ret = -ENOMEM; | |
868 | page = (char *)__get_free_page(GFP_TEMPORARY); | |
869 | if (!page) | |
870 | goto out; | |
871 | ||
872 | ret = 0; | |
873 | ||
874 | mm = get_task_mm(task); | |
875 | if (!mm) | |
876 | goto out_free; | |
877 | ||
878 | while (count > 0) { | |
879 | int this_len, retval, max_len; | |
880 | ||
881 | this_len = mm->env_end - (mm->env_start + src); | |
882 | ||
883 | if (this_len <= 0) | |
884 | break; | |
885 | ||
886 | max_len = (count > PAGE_SIZE) ? PAGE_SIZE : count; | |
887 | this_len = (this_len > max_len) ? max_len : this_len; | |
888 | ||
889 | retval = access_process_vm(task, (mm->env_start + src), | |
890 | page, this_len, 0); | |
891 | ||
892 | if (retval <= 0) { | |
893 | ret = retval; | |
894 | break; | |
895 | } | |
896 | ||
897 | if (copy_to_user(buf, page, retval)) { | |
898 | ret = -EFAULT; | |
899 | break; | |
900 | } | |
901 | ||
902 | ret += retval; | |
903 | src += retval; | |
904 | buf += retval; | |
905 | count -= retval; | |
906 | } | |
907 | *ppos = src; | |
908 | ||
909 | mmput(mm); | |
910 | out_free: | |
911 | free_page((unsigned long) page); | |
912 | out: | |
913 | put_task_struct(task); | |
914 | out_no_task: | |
915 | return ret; | |
916 | } | |
917 | ||
918 | static const struct file_operations proc_environ_operations = { | |
919 | .read = environ_read, | |
920 | }; | |
921 | ||
1da177e4 LT |
922 | static ssize_t oom_adjust_read(struct file *file, char __user *buf, |
923 | size_t count, loff_t *ppos) | |
924 | { | |
2fddfeef | 925 | struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode); |
8578cea7 | 926 | char buffer[PROC_NUMBUF]; |
1da177e4 | 927 | size_t len; |
99f89551 | 928 | int oom_adjust; |
1da177e4 | 929 | |
99f89551 EB |
930 | if (!task) |
931 | return -ESRCH; | |
932 | oom_adjust = task->oomkilladj; | |
933 | put_task_struct(task); | |
934 | ||
8578cea7 | 935 | len = snprintf(buffer, sizeof(buffer), "%i\n", oom_adjust); |
0c28f287 AM |
936 | |
937 | return simple_read_from_buffer(buf, count, ppos, buffer, len); | |
1da177e4 LT |
938 | } |
939 | ||
940 | static ssize_t oom_adjust_write(struct file *file, const char __user *buf, | |
941 | size_t count, loff_t *ppos) | |
942 | { | |
99f89551 | 943 | struct task_struct *task; |
8578cea7 | 944 | char buffer[PROC_NUMBUF], *end; |
1da177e4 LT |
945 | int oom_adjust; |
946 | ||
8578cea7 EB |
947 | memset(buffer, 0, sizeof(buffer)); |
948 | if (count > sizeof(buffer) - 1) | |
949 | count = sizeof(buffer) - 1; | |
1da177e4 LT |
950 | if (copy_from_user(buffer, buf, count)) |
951 | return -EFAULT; | |
952 | oom_adjust = simple_strtol(buffer, &end, 0); | |
8ac773b4 AD |
953 | if ((oom_adjust < OOM_ADJUST_MIN || oom_adjust > OOM_ADJUST_MAX) && |
954 | oom_adjust != OOM_DISABLE) | |
1da177e4 LT |
955 | return -EINVAL; |
956 | if (*end == '\n') | |
957 | end++; | |
2fddfeef | 958 | task = get_proc_task(file->f_path.dentry->d_inode); |
99f89551 EB |
959 | if (!task) |
960 | return -ESRCH; | |
8fb4fc68 GJ |
961 | if (oom_adjust < task->oomkilladj && !capable(CAP_SYS_RESOURCE)) { |
962 | put_task_struct(task); | |
963 | return -EACCES; | |
964 | } | |
1da177e4 | 965 | task->oomkilladj = oom_adjust; |
99f89551 | 966 | put_task_struct(task); |
1da177e4 LT |
967 | if (end - buffer == 0) |
968 | return -EIO; | |
969 | return end - buffer; | |
970 | } | |
971 | ||
00977a59 | 972 | static const struct file_operations proc_oom_adjust_operations = { |
1da177e4 LT |
973 | .read = oom_adjust_read, |
974 | .write = oom_adjust_write, | |
975 | }; | |
976 | ||
1da177e4 LT |
977 | #ifdef CONFIG_AUDITSYSCALL |
978 | #define TMPBUFLEN 21 | |
979 | static ssize_t proc_loginuid_read(struct file * file, char __user * buf, | |
980 | size_t count, loff_t *ppos) | |
981 | { | |
2fddfeef | 982 | struct inode * inode = file->f_path.dentry->d_inode; |
99f89551 | 983 | struct task_struct *task = get_proc_task(inode); |
1da177e4 LT |
984 | ssize_t length; |
985 | char tmpbuf[TMPBUFLEN]; | |
986 | ||
99f89551 EB |
987 | if (!task) |
988 | return -ESRCH; | |
1da177e4 | 989 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", |
0c11b942 | 990 | audit_get_loginuid(task)); |
99f89551 | 991 | put_task_struct(task); |
1da177e4 LT |
992 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); |
993 | } | |
994 | ||
995 | static ssize_t proc_loginuid_write(struct file * file, const char __user * buf, | |
996 | size_t count, loff_t *ppos) | |
997 | { | |
2fddfeef | 998 | struct inode * inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
999 | char *page, *tmp; |
1000 | ssize_t length; | |
1da177e4 LT |
1001 | uid_t loginuid; |
1002 | ||
1003 | if (!capable(CAP_AUDIT_CONTROL)) | |
1004 | return -EPERM; | |
1005 | ||
13b41b09 | 1006 | if (current != pid_task(proc_pid(inode), PIDTYPE_PID)) |
1da177e4 LT |
1007 | return -EPERM; |
1008 | ||
e0182909 AV |
1009 | if (count >= PAGE_SIZE) |
1010 | count = PAGE_SIZE - 1; | |
1da177e4 LT |
1011 | |
1012 | if (*ppos != 0) { | |
1013 | /* No partial writes. */ | |
1014 | return -EINVAL; | |
1015 | } | |
e12ba74d | 1016 | page = (char*)__get_free_page(GFP_TEMPORARY); |
1da177e4 LT |
1017 | if (!page) |
1018 | return -ENOMEM; | |
1019 | length = -EFAULT; | |
1020 | if (copy_from_user(page, buf, count)) | |
1021 | goto out_free_page; | |
1022 | ||
e0182909 | 1023 | page[count] = '\0'; |
1da177e4 LT |
1024 | loginuid = simple_strtoul(page, &tmp, 10); |
1025 | if (tmp == page) { | |
1026 | length = -EINVAL; | |
1027 | goto out_free_page; | |
1028 | ||
1029 | } | |
99f89551 | 1030 | length = audit_set_loginuid(current, loginuid); |
1da177e4 LT |
1031 | if (likely(length == 0)) |
1032 | length = count; | |
1033 | ||
1034 | out_free_page: | |
1035 | free_page((unsigned long) page); | |
1036 | return length; | |
1037 | } | |
1038 | ||
00977a59 | 1039 | static const struct file_operations proc_loginuid_operations = { |
1da177e4 LT |
1040 | .read = proc_loginuid_read, |
1041 | .write = proc_loginuid_write, | |
1042 | }; | |
1043 | #endif | |
1044 | ||
f4f154fd AM |
1045 | #ifdef CONFIG_FAULT_INJECTION |
1046 | static ssize_t proc_fault_inject_read(struct file * file, char __user * buf, | |
1047 | size_t count, loff_t *ppos) | |
1048 | { | |
1049 | struct task_struct *task = get_proc_task(file->f_dentry->d_inode); | |
1050 | char buffer[PROC_NUMBUF]; | |
1051 | size_t len; | |
1052 | int make_it_fail; | |
f4f154fd AM |
1053 | |
1054 | if (!task) | |
1055 | return -ESRCH; | |
1056 | make_it_fail = task->make_it_fail; | |
1057 | put_task_struct(task); | |
1058 | ||
1059 | len = snprintf(buffer, sizeof(buffer), "%i\n", make_it_fail); | |
0c28f287 AM |
1060 | |
1061 | return simple_read_from_buffer(buf, count, ppos, buffer, len); | |
f4f154fd AM |
1062 | } |
1063 | ||
1064 | static ssize_t proc_fault_inject_write(struct file * file, | |
1065 | const char __user * buf, size_t count, loff_t *ppos) | |
1066 | { | |
1067 | struct task_struct *task; | |
1068 | char buffer[PROC_NUMBUF], *end; | |
1069 | int make_it_fail; | |
1070 | ||
1071 | if (!capable(CAP_SYS_RESOURCE)) | |
1072 | return -EPERM; | |
1073 | memset(buffer, 0, sizeof(buffer)); | |
1074 | if (count > sizeof(buffer) - 1) | |
1075 | count = sizeof(buffer) - 1; | |
1076 | if (copy_from_user(buffer, buf, count)) | |
1077 | return -EFAULT; | |
1078 | make_it_fail = simple_strtol(buffer, &end, 0); | |
1079 | if (*end == '\n') | |
1080 | end++; | |
1081 | task = get_proc_task(file->f_dentry->d_inode); | |
1082 | if (!task) | |
1083 | return -ESRCH; | |
1084 | task->make_it_fail = make_it_fail; | |
1085 | put_task_struct(task); | |
1086 | if (end - buffer == 0) | |
1087 | return -EIO; | |
1088 | return end - buffer; | |
1089 | } | |
1090 | ||
00977a59 | 1091 | static const struct file_operations proc_fault_inject_operations = { |
f4f154fd AM |
1092 | .read = proc_fault_inject_read, |
1093 | .write = proc_fault_inject_write, | |
1094 | }; | |
1095 | #endif | |
1096 | ||
9745512c | 1097 | |
43ae34cb IM |
1098 | #ifdef CONFIG_SCHED_DEBUG |
1099 | /* | |
1100 | * Print out various scheduling related per-task fields: | |
1101 | */ | |
1102 | static int sched_show(struct seq_file *m, void *v) | |
1103 | { | |
1104 | struct inode *inode = m->private; | |
1105 | struct task_struct *p; | |
1106 | ||
1107 | WARN_ON(!inode); | |
1108 | ||
1109 | p = get_proc_task(inode); | |
1110 | if (!p) | |
1111 | return -ESRCH; | |
1112 | proc_sched_show_task(p, m); | |
1113 | ||
1114 | put_task_struct(p); | |
1115 | ||
1116 | return 0; | |
1117 | } | |
1118 | ||
1119 | static ssize_t | |
1120 | sched_write(struct file *file, const char __user *buf, | |
1121 | size_t count, loff_t *offset) | |
1122 | { | |
1123 | struct inode *inode = file->f_path.dentry->d_inode; | |
1124 | struct task_struct *p; | |
1125 | ||
1126 | WARN_ON(!inode); | |
1127 | ||
1128 | p = get_proc_task(inode); | |
1129 | if (!p) | |
1130 | return -ESRCH; | |
1131 | proc_sched_set_task(p); | |
1132 | ||
1133 | put_task_struct(p); | |
1134 | ||
1135 | return count; | |
1136 | } | |
1137 | ||
1138 | static int sched_open(struct inode *inode, struct file *filp) | |
1139 | { | |
1140 | int ret; | |
1141 | ||
1142 | ret = single_open(filp, sched_show, NULL); | |
1143 | if (!ret) { | |
1144 | struct seq_file *m = filp->private_data; | |
1145 | ||
1146 | m->private = inode; | |
1147 | } | |
1148 | return ret; | |
1149 | } | |
1150 | ||
1151 | static const struct file_operations proc_pid_sched_operations = { | |
1152 | .open = sched_open, | |
1153 | .read = seq_read, | |
1154 | .write = sched_write, | |
1155 | .llseek = seq_lseek, | |
5ea473a1 | 1156 | .release = single_release, |
43ae34cb IM |
1157 | }; |
1158 | ||
1159 | #endif | |
1160 | ||
008b150a | 1161 | static void *proc_pid_follow_link(struct dentry *dentry, struct nameidata *nd) |
1da177e4 LT |
1162 | { |
1163 | struct inode *inode = dentry->d_inode; | |
1164 | int error = -EACCES; | |
1165 | ||
1166 | /* We don't need a base pointer in the /proc filesystem */ | |
1167 | path_release(nd); | |
1168 | ||
778c1144 EB |
1169 | /* Are we allowed to snoop on the tasks file descriptors? */ |
1170 | if (!proc_fd_access_allowed(inode)) | |
1da177e4 | 1171 | goto out; |
1da177e4 LT |
1172 | |
1173 | error = PROC_I(inode)->op.proc_get_link(inode, &nd->dentry, &nd->mnt); | |
1174 | nd->last_type = LAST_BIND; | |
1175 | out: | |
008b150a | 1176 | return ERR_PTR(error); |
1da177e4 LT |
1177 | } |
1178 | ||
1179 | static int do_proc_readlink(struct dentry *dentry, struct vfsmount *mnt, | |
1180 | char __user *buffer, int buflen) | |
1181 | { | |
1182 | struct inode * inode; | |
e12ba74d MG |
1183 | char *tmp = (char*)__get_free_page(GFP_TEMPORARY); |
1184 | char *path; | |
1da177e4 LT |
1185 | int len; |
1186 | ||
1187 | if (!tmp) | |
1188 | return -ENOMEM; | |
0c28f287 | 1189 | |
1da177e4 LT |
1190 | inode = dentry->d_inode; |
1191 | path = d_path(dentry, mnt, tmp, PAGE_SIZE); | |
1192 | len = PTR_ERR(path); | |
1193 | if (IS_ERR(path)) | |
1194 | goto out; | |
1195 | len = tmp + PAGE_SIZE - 1 - path; | |
1196 | ||
1197 | if (len > buflen) | |
1198 | len = buflen; | |
1199 | if (copy_to_user(buffer, path, len)) | |
1200 | len = -EFAULT; | |
1201 | out: | |
1202 | free_page((unsigned long)tmp); | |
1203 | return len; | |
1204 | } | |
1205 | ||
1206 | static int proc_pid_readlink(struct dentry * dentry, char __user * buffer, int buflen) | |
1207 | { | |
1208 | int error = -EACCES; | |
1209 | struct inode *inode = dentry->d_inode; | |
1210 | struct dentry *de; | |
1211 | struct vfsmount *mnt = NULL; | |
1212 | ||
778c1144 EB |
1213 | /* Are we allowed to snoop on the tasks file descriptors? */ |
1214 | if (!proc_fd_access_allowed(inode)) | |
1da177e4 | 1215 | goto out; |
1da177e4 LT |
1216 | |
1217 | error = PROC_I(inode)->op.proc_get_link(inode, &de, &mnt); | |
1218 | if (error) | |
1219 | goto out; | |
1220 | ||
1221 | error = do_proc_readlink(de, mnt, buffer, buflen); | |
1222 | dput(de); | |
1223 | mntput(mnt); | |
1224 | out: | |
1da177e4 LT |
1225 | return error; |
1226 | } | |
1227 | ||
c5ef1c42 | 1228 | static const struct inode_operations proc_pid_link_inode_operations = { |
1da177e4 | 1229 | .readlink = proc_pid_readlink, |
6d76fa58 LT |
1230 | .follow_link = proc_pid_follow_link, |
1231 | .setattr = proc_setattr, | |
1da177e4 LT |
1232 | }; |
1233 | ||
28a6d671 EB |
1234 | |
1235 | /* building an inode */ | |
1236 | ||
1237 | static int task_dumpable(struct task_struct *task) | |
1da177e4 | 1238 | { |
28a6d671 EB |
1239 | int dumpable = 0; |
1240 | struct mm_struct *mm; | |
1da177e4 | 1241 | |
28a6d671 EB |
1242 | task_lock(task); |
1243 | mm = task->mm; | |
1244 | if (mm) | |
6c5d5238 | 1245 | dumpable = get_dumpable(mm); |
28a6d671 EB |
1246 | task_unlock(task); |
1247 | if(dumpable == 1) | |
1248 | return 1; | |
1249 | return 0; | |
1250 | } | |
1da177e4 | 1251 | |
1da177e4 | 1252 | |
61a28784 | 1253 | static struct inode *proc_pid_make_inode(struct super_block * sb, struct task_struct *task) |
28a6d671 EB |
1254 | { |
1255 | struct inode * inode; | |
1256 | struct proc_inode *ei; | |
1da177e4 | 1257 | |
28a6d671 | 1258 | /* We need a new inode */ |
1da177e4 | 1259 | |
28a6d671 EB |
1260 | inode = new_inode(sb); |
1261 | if (!inode) | |
1262 | goto out; | |
1263 | ||
1264 | /* Common stuff */ | |
1265 | ei = PROC_I(inode); | |
1266 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; | |
28a6d671 EB |
1267 | inode->i_op = &proc_def_inode_operations; |
1268 | ||
1269 | /* | |
1270 | * grab the reference to task. | |
1271 | */ | |
1a657f78 | 1272 | ei->pid = get_task_pid(task, PIDTYPE_PID); |
28a6d671 EB |
1273 | if (!ei->pid) |
1274 | goto out_unlock; | |
1275 | ||
1276 | inode->i_uid = 0; | |
1277 | inode->i_gid = 0; | |
1278 | if (task_dumpable(task)) { | |
1279 | inode->i_uid = task->euid; | |
1280 | inode->i_gid = task->egid; | |
1da177e4 | 1281 | } |
28a6d671 EB |
1282 | security_task_to_inode(task, inode); |
1283 | ||
1da177e4 | 1284 | out: |
28a6d671 EB |
1285 | return inode; |
1286 | ||
1287 | out_unlock: | |
1288 | iput(inode); | |
1289 | return NULL; | |
1da177e4 LT |
1290 | } |
1291 | ||
28a6d671 | 1292 | static int pid_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) |
1da177e4 | 1293 | { |
1da177e4 | 1294 | struct inode *inode = dentry->d_inode; |
28a6d671 EB |
1295 | struct task_struct *task; |
1296 | generic_fillattr(inode, stat); | |
1da177e4 | 1297 | |
28a6d671 EB |
1298 | rcu_read_lock(); |
1299 | stat->uid = 0; | |
1300 | stat->gid = 0; | |
1301 | task = pid_task(proc_pid(inode), PIDTYPE_PID); | |
1302 | if (task) { | |
1303 | if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) || | |
1304 | task_dumpable(task)) { | |
1305 | stat->uid = task->euid; | |
1306 | stat->gid = task->egid; | |
1da177e4 LT |
1307 | } |
1308 | } | |
28a6d671 | 1309 | rcu_read_unlock(); |
d6e71144 | 1310 | return 0; |
1da177e4 LT |
1311 | } |
1312 | ||
1da177e4 LT |
1313 | /* dentry stuff */ |
1314 | ||
1315 | /* | |
1316 | * Exceptional case: normally we are not allowed to unhash a busy | |
1317 | * directory. In this case, however, we can do it - no aliasing problems | |
1318 | * due to the way we treat inodes. | |
1319 | * | |
1320 | * Rewrite the inode's ownerships here because the owning task may have | |
1321 | * performed a setuid(), etc. | |
99f89551 EB |
1322 | * |
1323 | * Before the /proc/pid/status file was created the only way to read | |
1324 | * the effective uid of a /process was to stat /proc/pid. Reading | |
1325 | * /proc/pid/status is slow enough that procps and other packages | |
1326 | * kept stating /proc/pid. To keep the rules in /proc simple I have | |
1327 | * made this apply to all per process world readable and executable | |
1328 | * directories. | |
1da177e4 LT |
1329 | */ |
1330 | static int pid_revalidate(struct dentry *dentry, struct nameidata *nd) | |
1331 | { | |
1332 | struct inode *inode = dentry->d_inode; | |
99f89551 EB |
1333 | struct task_struct *task = get_proc_task(inode); |
1334 | if (task) { | |
1335 | if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) || | |
1336 | task_dumpable(task)) { | |
1da177e4 LT |
1337 | inode->i_uid = task->euid; |
1338 | inode->i_gid = task->egid; | |
1339 | } else { | |
1340 | inode->i_uid = 0; | |
1341 | inode->i_gid = 0; | |
1342 | } | |
9ee8ab9f | 1343 | inode->i_mode &= ~(S_ISUID | S_ISGID); |
1da177e4 | 1344 | security_task_to_inode(task, inode); |
99f89551 | 1345 | put_task_struct(task); |
1da177e4 LT |
1346 | return 1; |
1347 | } | |
1348 | d_drop(dentry); | |
1349 | return 0; | |
1350 | } | |
1351 | ||
28a6d671 | 1352 | static int pid_delete_dentry(struct dentry * dentry) |
99f89551 | 1353 | { |
28a6d671 EB |
1354 | /* Is the task we represent dead? |
1355 | * If so, then don't put the dentry on the lru list, | |
1356 | * kill it immediately. | |
1357 | */ | |
1358 | return !proc_pid(dentry->d_inode)->tasks[PIDTYPE_PID].first; | |
1359 | } | |
1360 | ||
1361 | static struct dentry_operations pid_dentry_operations = | |
1362 | { | |
1363 | .d_revalidate = pid_revalidate, | |
1364 | .d_delete = pid_delete_dentry, | |
1365 | }; | |
1366 | ||
1367 | /* Lookups */ | |
1368 | ||
c5141e6d ED |
1369 | typedef struct dentry *instantiate_t(struct inode *, struct dentry *, |
1370 | struct task_struct *, const void *); | |
61a28784 | 1371 | |
1c0d04c9 EB |
1372 | /* |
1373 | * Fill a directory entry. | |
1374 | * | |
1375 | * If possible create the dcache entry and derive our inode number and | |
1376 | * file type from dcache entry. | |
1377 | * | |
1378 | * Since all of the proc inode numbers are dynamically generated, the inode | |
1379 | * numbers do not exist until the inode is cache. This means creating the | |
1380 | * the dcache entry in readdir is necessary to keep the inode numbers | |
1381 | * reported by readdir in sync with the inode numbers reported | |
1382 | * by stat. | |
1383 | */ | |
61a28784 EB |
1384 | static int proc_fill_cache(struct file *filp, void *dirent, filldir_t filldir, |
1385 | char *name, int len, | |
c5141e6d | 1386 | instantiate_t instantiate, struct task_struct *task, const void *ptr) |
61a28784 | 1387 | { |
2fddfeef | 1388 | struct dentry *child, *dir = filp->f_path.dentry; |
61a28784 EB |
1389 | struct inode *inode; |
1390 | struct qstr qname; | |
1391 | ino_t ino = 0; | |
1392 | unsigned type = DT_UNKNOWN; | |
1393 | ||
1394 | qname.name = name; | |
1395 | qname.len = len; | |
1396 | qname.hash = full_name_hash(name, len); | |
1397 | ||
1398 | child = d_lookup(dir, &qname); | |
1399 | if (!child) { | |
1400 | struct dentry *new; | |
1401 | new = d_alloc(dir, &qname); | |
1402 | if (new) { | |
1403 | child = instantiate(dir->d_inode, new, task, ptr); | |
1404 | if (child) | |
1405 | dput(new); | |
1406 | else | |
1407 | child = new; | |
1408 | } | |
1409 | } | |
1410 | if (!child || IS_ERR(child) || !child->d_inode) | |
1411 | goto end_instantiate; | |
1412 | inode = child->d_inode; | |
1413 | if (inode) { | |
1414 | ino = inode->i_ino; | |
1415 | type = inode->i_mode >> 12; | |
1416 | } | |
1417 | dput(child); | |
1418 | end_instantiate: | |
1419 | if (!ino) | |
1420 | ino = find_inode_number(dir, &qname); | |
1421 | if (!ino) | |
1422 | ino = 1; | |
1423 | return filldir(dirent, name, len, filp->f_pos, ino, type); | |
1424 | } | |
1425 | ||
28a6d671 EB |
1426 | static unsigned name_to_int(struct dentry *dentry) |
1427 | { | |
1428 | const char *name = dentry->d_name.name; | |
1429 | int len = dentry->d_name.len; | |
1430 | unsigned n = 0; | |
1431 | ||
1432 | if (len > 1 && *name == '0') | |
1433 | goto out; | |
1434 | while (len-- > 0) { | |
1435 | unsigned c = *name++ - '0'; | |
1436 | if (c > 9) | |
1437 | goto out; | |
1438 | if (n >= (~0U-9)/10) | |
1439 | goto out; | |
1440 | n *= 10; | |
1441 | n += c; | |
1442 | } | |
1443 | return n; | |
1444 | out: | |
1445 | return ~0U; | |
1446 | } | |
1447 | ||
27932742 MS |
1448 | #define PROC_FDINFO_MAX 64 |
1449 | ||
1450 | static int proc_fd_info(struct inode *inode, struct dentry **dentry, | |
1451 | struct vfsmount **mnt, char *info) | |
28a6d671 EB |
1452 | { |
1453 | struct task_struct *task = get_proc_task(inode); | |
1454 | struct files_struct *files = NULL; | |
1455 | struct file *file; | |
1456 | int fd = proc_fd(inode); | |
99f89551 | 1457 | |
99f89551 | 1458 | if (task) { |
28a6d671 EB |
1459 | files = get_files_struct(task); |
1460 | put_task_struct(task); | |
1461 | } | |
1462 | if (files) { | |
1463 | /* | |
1464 | * We are not taking a ref to the file structure, so we must | |
1465 | * hold ->file_lock. | |
1466 | */ | |
1467 | spin_lock(&files->file_lock); | |
1468 | file = fcheck_files(files, fd); | |
1469 | if (file) { | |
27932742 MS |
1470 | if (mnt) |
1471 | *mnt = mntget(file->f_path.mnt); | |
1472 | if (dentry) | |
1473 | *dentry = dget(file->f_path.dentry); | |
1474 | if (info) | |
1475 | snprintf(info, PROC_FDINFO_MAX, | |
1476 | "pos:\t%lli\n" | |
1477 | "flags:\t0%o\n", | |
1478 | (long long) file->f_pos, | |
1479 | file->f_flags); | |
28a6d671 EB |
1480 | spin_unlock(&files->file_lock); |
1481 | put_files_struct(files); | |
1482 | return 0; | |
99f89551 | 1483 | } |
28a6d671 EB |
1484 | spin_unlock(&files->file_lock); |
1485 | put_files_struct(files); | |
99f89551 | 1486 | } |
28a6d671 | 1487 | return -ENOENT; |
99f89551 EB |
1488 | } |
1489 | ||
27932742 MS |
1490 | static int proc_fd_link(struct inode *inode, struct dentry **dentry, |
1491 | struct vfsmount **mnt) | |
1492 | { | |
1493 | return proc_fd_info(inode, dentry, mnt, NULL); | |
1494 | } | |
1495 | ||
1da177e4 LT |
1496 | static int tid_fd_revalidate(struct dentry *dentry, struct nameidata *nd) |
1497 | { | |
1498 | struct inode *inode = dentry->d_inode; | |
99f89551 | 1499 | struct task_struct *task = get_proc_task(inode); |
aed7a6c4 | 1500 | int fd = proc_fd(inode); |
1da177e4 LT |
1501 | struct files_struct *files; |
1502 | ||
99f89551 EB |
1503 | if (task) { |
1504 | files = get_files_struct(task); | |
1505 | if (files) { | |
1506 | rcu_read_lock(); | |
1507 | if (fcheck_files(files, fd)) { | |
1508 | rcu_read_unlock(); | |
1509 | put_files_struct(files); | |
1510 | if (task_dumpable(task)) { | |
1511 | inode->i_uid = task->euid; | |
1512 | inode->i_gid = task->egid; | |
1513 | } else { | |
1514 | inode->i_uid = 0; | |
1515 | inode->i_gid = 0; | |
1516 | } | |
9ee8ab9f | 1517 | inode->i_mode &= ~(S_ISUID | S_ISGID); |
99f89551 EB |
1518 | security_task_to_inode(task, inode); |
1519 | put_task_struct(task); | |
1520 | return 1; | |
1521 | } | |
b835996f | 1522 | rcu_read_unlock(); |
1da177e4 | 1523 | put_files_struct(files); |
1da177e4 | 1524 | } |
99f89551 | 1525 | put_task_struct(task); |
1da177e4 LT |
1526 | } |
1527 | d_drop(dentry); | |
1528 | return 0; | |
1529 | } | |
1530 | ||
1da177e4 LT |
1531 | static struct dentry_operations tid_fd_dentry_operations = |
1532 | { | |
1533 | .d_revalidate = tid_fd_revalidate, | |
1534 | .d_delete = pid_delete_dentry, | |
1535 | }; | |
1536 | ||
444ceed8 | 1537 | static struct dentry *proc_fd_instantiate(struct inode *dir, |
c5141e6d | 1538 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
1da177e4 | 1539 | { |
c5141e6d | 1540 | unsigned fd = *(const unsigned *)ptr; |
444ceed8 EB |
1541 | struct file *file; |
1542 | struct files_struct *files; | |
1543 | struct inode *inode; | |
1544 | struct proc_inode *ei; | |
1545 | struct dentry *error = ERR_PTR(-ENOENT); | |
1da177e4 | 1546 | |
61a28784 | 1547 | inode = proc_pid_make_inode(dir->i_sb, task); |
1da177e4 LT |
1548 | if (!inode) |
1549 | goto out; | |
1550 | ei = PROC_I(inode); | |
aed7a6c4 | 1551 | ei->fd = fd; |
1da177e4 LT |
1552 | files = get_files_struct(task); |
1553 | if (!files) | |
444ceed8 | 1554 | goto out_iput; |
1da177e4 | 1555 | inode->i_mode = S_IFLNK; |
ca99c1da DS |
1556 | |
1557 | /* | |
1558 | * We are not taking a ref to the file structure, so we must | |
1559 | * hold ->file_lock. | |
1560 | */ | |
1561 | spin_lock(&files->file_lock); | |
1da177e4 LT |
1562 | file = fcheck_files(files, fd); |
1563 | if (!file) | |
444ceed8 | 1564 | goto out_unlock; |
1da177e4 LT |
1565 | if (file->f_mode & 1) |
1566 | inode->i_mode |= S_IRUSR | S_IXUSR; | |
1567 | if (file->f_mode & 2) | |
1568 | inode->i_mode |= S_IWUSR | S_IXUSR; | |
ca99c1da | 1569 | spin_unlock(&files->file_lock); |
1da177e4 | 1570 | put_files_struct(files); |
444ceed8 | 1571 | |
1da177e4 LT |
1572 | inode->i_op = &proc_pid_link_inode_operations; |
1573 | inode->i_size = 64; | |
1574 | ei->op.proc_get_link = proc_fd_link; | |
1575 | dentry->d_op = &tid_fd_dentry_operations; | |
1576 | d_add(dentry, inode); | |
cd6a3ce9 EB |
1577 | /* Close the race of the process dying before we return the dentry */ |
1578 | if (tid_fd_revalidate(dentry, NULL)) | |
444ceed8 | 1579 | error = NULL; |
1da177e4 | 1580 | |
444ceed8 EB |
1581 | out: |
1582 | return error; | |
1583 | out_unlock: | |
ca99c1da | 1584 | spin_unlock(&files->file_lock); |
1da177e4 | 1585 | put_files_struct(files); |
444ceed8 | 1586 | out_iput: |
1da177e4 | 1587 | iput(inode); |
cd6a3ce9 | 1588 | goto out; |
1da177e4 LT |
1589 | } |
1590 | ||
27932742 MS |
1591 | static struct dentry *proc_lookupfd_common(struct inode *dir, |
1592 | struct dentry *dentry, | |
1593 | instantiate_t instantiate) | |
444ceed8 EB |
1594 | { |
1595 | struct task_struct *task = get_proc_task(dir); | |
1596 | unsigned fd = name_to_int(dentry); | |
1597 | struct dentry *result = ERR_PTR(-ENOENT); | |
1598 | ||
1599 | if (!task) | |
1600 | goto out_no_task; | |
1601 | if (fd == ~0U) | |
1602 | goto out; | |
1603 | ||
27932742 | 1604 | result = instantiate(dir, dentry, task, &fd); |
444ceed8 EB |
1605 | out: |
1606 | put_task_struct(task); | |
1607 | out_no_task: | |
1608 | return result; | |
1609 | } | |
1610 | ||
27932742 MS |
1611 | static int proc_readfd_common(struct file * filp, void * dirent, |
1612 | filldir_t filldir, instantiate_t instantiate) | |
28a6d671 | 1613 | { |
2fddfeef | 1614 | struct dentry *dentry = filp->f_path.dentry; |
28a6d671 EB |
1615 | struct inode *inode = dentry->d_inode; |
1616 | struct task_struct *p = get_proc_task(inode); | |
457c2510 | 1617 | unsigned int fd, ino; |
28a6d671 | 1618 | int retval; |
28a6d671 EB |
1619 | struct files_struct * files; |
1620 | struct fdtable *fdt; | |
1da177e4 | 1621 | |
28a6d671 EB |
1622 | retval = -ENOENT; |
1623 | if (!p) | |
1624 | goto out_no_task; | |
1625 | retval = 0; | |
28a6d671 EB |
1626 | |
1627 | fd = filp->f_pos; | |
1628 | switch (fd) { | |
1629 | case 0: | |
1630 | if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0) | |
1631 | goto out; | |
1632 | filp->f_pos++; | |
1633 | case 1: | |
1634 | ino = parent_ino(dentry); | |
1635 | if (filldir(dirent, "..", 2, 1, ino, DT_DIR) < 0) | |
1636 | goto out; | |
1637 | filp->f_pos++; | |
1638 | default: | |
1639 | files = get_files_struct(p); | |
1640 | if (!files) | |
1641 | goto out; | |
1642 | rcu_read_lock(); | |
1643 | fdt = files_fdtable(files); | |
1644 | for (fd = filp->f_pos-2; | |
1645 | fd < fdt->max_fds; | |
1646 | fd++, filp->f_pos++) { | |
27932742 MS |
1647 | char name[PROC_NUMBUF]; |
1648 | int len; | |
28a6d671 EB |
1649 | |
1650 | if (!fcheck_files(files, fd)) | |
1651 | continue; | |
1652 | rcu_read_unlock(); | |
1653 | ||
27932742 MS |
1654 | len = snprintf(name, sizeof(name), "%d", fd); |
1655 | if (proc_fill_cache(filp, dirent, filldir, | |
1656 | name, len, instantiate, | |
1657 | p, &fd) < 0) { | |
28a6d671 EB |
1658 | rcu_read_lock(); |
1659 | break; | |
1660 | } | |
1661 | rcu_read_lock(); | |
1662 | } | |
1663 | rcu_read_unlock(); | |
1664 | put_files_struct(files); | |
1665 | } | |
1666 | out: | |
1667 | put_task_struct(p); | |
1668 | out_no_task: | |
1669 | return retval; | |
1670 | } | |
1671 | ||
27932742 MS |
1672 | static struct dentry *proc_lookupfd(struct inode *dir, struct dentry *dentry, |
1673 | struct nameidata *nd) | |
1674 | { | |
1675 | return proc_lookupfd_common(dir, dentry, proc_fd_instantiate); | |
1676 | } | |
1677 | ||
1678 | static int proc_readfd(struct file *filp, void *dirent, filldir_t filldir) | |
1679 | { | |
1680 | return proc_readfd_common(filp, dirent, filldir, proc_fd_instantiate); | |
1681 | } | |
1682 | ||
1683 | static ssize_t proc_fdinfo_read(struct file *file, char __user *buf, | |
1684 | size_t len, loff_t *ppos) | |
1685 | { | |
1686 | char tmp[PROC_FDINFO_MAX]; | |
1687 | int err = proc_fd_info(file->f_path.dentry->d_inode, NULL, NULL, tmp); | |
1688 | if (!err) | |
1689 | err = simple_read_from_buffer(buf, len, ppos, tmp, strlen(tmp)); | |
1690 | return err; | |
1691 | } | |
1692 | ||
1693 | static const struct file_operations proc_fdinfo_file_operations = { | |
1694 | .open = nonseekable_open, | |
1695 | .read = proc_fdinfo_read, | |
1696 | }; | |
1697 | ||
00977a59 | 1698 | static const struct file_operations proc_fd_operations = { |
28a6d671 EB |
1699 | .read = generic_read_dir, |
1700 | .readdir = proc_readfd, | |
1da177e4 LT |
1701 | }; |
1702 | ||
8948e11f AD |
1703 | /* |
1704 | * /proc/pid/fd needs a special permission handler so that a process can still | |
1705 | * access /proc/self/fd after it has executed a setuid(). | |
1706 | */ | |
1707 | static int proc_fd_permission(struct inode *inode, int mask, | |
1708 | struct nameidata *nd) | |
1709 | { | |
1710 | int rv; | |
1711 | ||
1712 | rv = generic_permission(inode, mask, NULL); | |
1713 | if (rv == 0) | |
1714 | return 0; | |
1715 | if (task_pid(current) == proc_pid(inode)) | |
1716 | rv = 0; | |
1717 | return rv; | |
1718 | } | |
1719 | ||
1da177e4 LT |
1720 | /* |
1721 | * proc directories can do almost nothing.. | |
1722 | */ | |
c5ef1c42 | 1723 | static const struct inode_operations proc_fd_inode_operations = { |
1da177e4 | 1724 | .lookup = proc_lookupfd, |
8948e11f | 1725 | .permission = proc_fd_permission, |
6d76fa58 | 1726 | .setattr = proc_setattr, |
1da177e4 LT |
1727 | }; |
1728 | ||
27932742 MS |
1729 | static struct dentry *proc_fdinfo_instantiate(struct inode *dir, |
1730 | struct dentry *dentry, struct task_struct *task, const void *ptr) | |
1731 | { | |
1732 | unsigned fd = *(unsigned *)ptr; | |
1733 | struct inode *inode; | |
1734 | struct proc_inode *ei; | |
1735 | struct dentry *error = ERR_PTR(-ENOENT); | |
1736 | ||
1737 | inode = proc_pid_make_inode(dir->i_sb, task); | |
1738 | if (!inode) | |
1739 | goto out; | |
1740 | ei = PROC_I(inode); | |
1741 | ei->fd = fd; | |
1742 | inode->i_mode = S_IFREG | S_IRUSR; | |
1743 | inode->i_fop = &proc_fdinfo_file_operations; | |
1744 | dentry->d_op = &tid_fd_dentry_operations; | |
1745 | d_add(dentry, inode); | |
1746 | /* Close the race of the process dying before we return the dentry */ | |
1747 | if (tid_fd_revalidate(dentry, NULL)) | |
1748 | error = NULL; | |
1749 | ||
1750 | out: | |
1751 | return error; | |
1752 | } | |
1753 | ||
1754 | static struct dentry *proc_lookupfdinfo(struct inode *dir, | |
1755 | struct dentry *dentry, | |
1756 | struct nameidata *nd) | |
1757 | { | |
1758 | return proc_lookupfd_common(dir, dentry, proc_fdinfo_instantiate); | |
1759 | } | |
1760 | ||
1761 | static int proc_readfdinfo(struct file *filp, void *dirent, filldir_t filldir) | |
1762 | { | |
1763 | return proc_readfd_common(filp, dirent, filldir, | |
1764 | proc_fdinfo_instantiate); | |
1765 | } | |
1766 | ||
1767 | static const struct file_operations proc_fdinfo_operations = { | |
1768 | .read = generic_read_dir, | |
1769 | .readdir = proc_readfdinfo, | |
1770 | }; | |
1771 | ||
1772 | /* | |
1773 | * proc directories can do almost nothing.. | |
1774 | */ | |
1775 | static const struct inode_operations proc_fdinfo_inode_operations = { | |
1776 | .lookup = proc_lookupfdinfo, | |
1777 | .setattr = proc_setattr, | |
1778 | }; | |
1779 | ||
1780 | ||
444ceed8 | 1781 | static struct dentry *proc_pident_instantiate(struct inode *dir, |
c5141e6d | 1782 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
444ceed8 | 1783 | { |
c5141e6d | 1784 | const struct pid_entry *p = ptr; |
444ceed8 EB |
1785 | struct inode *inode; |
1786 | struct proc_inode *ei; | |
1787 | struct dentry *error = ERR_PTR(-EINVAL); | |
1788 | ||
61a28784 | 1789 | inode = proc_pid_make_inode(dir->i_sb, task); |
444ceed8 EB |
1790 | if (!inode) |
1791 | goto out; | |
1792 | ||
1793 | ei = PROC_I(inode); | |
1794 | inode->i_mode = p->mode; | |
1795 | if (S_ISDIR(inode->i_mode)) | |
1796 | inode->i_nlink = 2; /* Use getattr to fix if necessary */ | |
1797 | if (p->iop) | |
1798 | inode->i_op = p->iop; | |
1799 | if (p->fop) | |
1800 | inode->i_fop = p->fop; | |
1801 | ei->op = p->op; | |
1802 | dentry->d_op = &pid_dentry_operations; | |
1803 | d_add(dentry, inode); | |
1804 | /* Close the race of the process dying before we return the dentry */ | |
1805 | if (pid_revalidate(dentry, NULL)) | |
1806 | error = NULL; | |
1807 | out: | |
1808 | return error; | |
1809 | } | |
1810 | ||
1da177e4 LT |
1811 | static struct dentry *proc_pident_lookup(struct inode *dir, |
1812 | struct dentry *dentry, | |
c5141e6d | 1813 | const struct pid_entry *ents, |
7bcd6b0e | 1814 | unsigned int nents) |
1da177e4 LT |
1815 | { |
1816 | struct inode *inode; | |
cd6a3ce9 | 1817 | struct dentry *error; |
99f89551 | 1818 | struct task_struct *task = get_proc_task(dir); |
c5141e6d | 1819 | const struct pid_entry *p, *last; |
1da177e4 | 1820 | |
cd6a3ce9 | 1821 | error = ERR_PTR(-ENOENT); |
1da177e4 LT |
1822 | inode = NULL; |
1823 | ||
99f89551 EB |
1824 | if (!task) |
1825 | goto out_no_task; | |
1da177e4 | 1826 | |
20cdc894 EB |
1827 | /* |
1828 | * Yes, it does not scale. And it should not. Don't add | |
1829 | * new entries into /proc/<tgid>/ without very good reasons. | |
1830 | */ | |
7bcd6b0e EB |
1831 | last = &ents[nents - 1]; |
1832 | for (p = ents; p <= last; p++) { | |
1da177e4 LT |
1833 | if (p->len != dentry->d_name.len) |
1834 | continue; | |
1835 | if (!memcmp(dentry->d_name.name, p->name, p->len)) | |
1836 | break; | |
1837 | } | |
7bcd6b0e | 1838 | if (p > last) |
1da177e4 LT |
1839 | goto out; |
1840 | ||
444ceed8 | 1841 | error = proc_pident_instantiate(dir, dentry, task, p); |
1da177e4 | 1842 | out: |
99f89551 EB |
1843 | put_task_struct(task); |
1844 | out_no_task: | |
cd6a3ce9 | 1845 | return error; |
1da177e4 LT |
1846 | } |
1847 | ||
c5141e6d ED |
1848 | static int proc_pident_fill_cache(struct file *filp, void *dirent, |
1849 | filldir_t filldir, struct task_struct *task, const struct pid_entry *p) | |
61a28784 EB |
1850 | { |
1851 | return proc_fill_cache(filp, dirent, filldir, p->name, p->len, | |
1852 | proc_pident_instantiate, task, p); | |
1853 | } | |
1854 | ||
28a6d671 EB |
1855 | static int proc_pident_readdir(struct file *filp, |
1856 | void *dirent, filldir_t filldir, | |
c5141e6d | 1857 | const struct pid_entry *ents, unsigned int nents) |
28a6d671 EB |
1858 | { |
1859 | int i; | |
2fddfeef | 1860 | struct dentry *dentry = filp->f_path.dentry; |
28a6d671 EB |
1861 | struct inode *inode = dentry->d_inode; |
1862 | struct task_struct *task = get_proc_task(inode); | |
c5141e6d | 1863 | const struct pid_entry *p, *last; |
28a6d671 EB |
1864 | ino_t ino; |
1865 | int ret; | |
1866 | ||
1867 | ret = -ENOENT; | |
1868 | if (!task) | |
61a28784 | 1869 | goto out_no_task; |
28a6d671 EB |
1870 | |
1871 | ret = 0; | |
28a6d671 EB |
1872 | i = filp->f_pos; |
1873 | switch (i) { | |
1874 | case 0: | |
1875 | ino = inode->i_ino; | |
1876 | if (filldir(dirent, ".", 1, i, ino, DT_DIR) < 0) | |
1877 | goto out; | |
1878 | i++; | |
1879 | filp->f_pos++; | |
1880 | /* fall through */ | |
1881 | case 1: | |
1882 | ino = parent_ino(dentry); | |
1883 | if (filldir(dirent, "..", 2, i, ino, DT_DIR) < 0) | |
1884 | goto out; | |
1885 | i++; | |
1886 | filp->f_pos++; | |
1887 | /* fall through */ | |
1888 | default: | |
1889 | i -= 2; | |
1890 | if (i >= nents) { | |
1891 | ret = 1; | |
1892 | goto out; | |
1893 | } | |
1894 | p = ents + i; | |
7bcd6b0e EB |
1895 | last = &ents[nents - 1]; |
1896 | while (p <= last) { | |
61a28784 | 1897 | if (proc_pident_fill_cache(filp, dirent, filldir, task, p) < 0) |
28a6d671 EB |
1898 | goto out; |
1899 | filp->f_pos++; | |
1900 | p++; | |
1901 | } | |
1902 | } | |
1903 | ||
1904 | ret = 1; | |
1905 | out: | |
61a28784 EB |
1906 | put_task_struct(task); |
1907 | out_no_task: | |
28a6d671 | 1908 | return ret; |
1da177e4 LT |
1909 | } |
1910 | ||
28a6d671 EB |
1911 | #ifdef CONFIG_SECURITY |
1912 | static ssize_t proc_pid_attr_read(struct file * file, char __user * buf, | |
1913 | size_t count, loff_t *ppos) | |
1914 | { | |
2fddfeef | 1915 | struct inode * inode = file->f_path.dentry->d_inode; |
04ff9708 | 1916 | char *p = NULL; |
28a6d671 EB |
1917 | ssize_t length; |
1918 | struct task_struct *task = get_proc_task(inode); | |
1919 | ||
28a6d671 | 1920 | if (!task) |
04ff9708 | 1921 | return -ESRCH; |
28a6d671 EB |
1922 | |
1923 | length = security_getprocattr(task, | |
2fddfeef | 1924 | (char*)file->f_path.dentry->d_name.name, |
04ff9708 | 1925 | &p); |
28a6d671 | 1926 | put_task_struct(task); |
04ff9708 AV |
1927 | if (length > 0) |
1928 | length = simple_read_from_buffer(buf, count, ppos, p, length); | |
1929 | kfree(p); | |
28a6d671 | 1930 | return length; |
1da177e4 LT |
1931 | } |
1932 | ||
28a6d671 EB |
1933 | static ssize_t proc_pid_attr_write(struct file * file, const char __user * buf, |
1934 | size_t count, loff_t *ppos) | |
1935 | { | |
2fddfeef | 1936 | struct inode * inode = file->f_path.dentry->d_inode; |
28a6d671 EB |
1937 | char *page; |
1938 | ssize_t length; | |
1939 | struct task_struct *task = get_proc_task(inode); | |
1940 | ||
1941 | length = -ESRCH; | |
1942 | if (!task) | |
1943 | goto out_no_task; | |
1944 | if (count > PAGE_SIZE) | |
1945 | count = PAGE_SIZE; | |
1946 | ||
1947 | /* No partial writes. */ | |
1948 | length = -EINVAL; | |
1949 | if (*ppos != 0) | |
1950 | goto out; | |
1951 | ||
1952 | length = -ENOMEM; | |
e12ba74d | 1953 | page = (char*)__get_free_page(GFP_TEMPORARY); |
28a6d671 EB |
1954 | if (!page) |
1955 | goto out; | |
1956 | ||
1957 | length = -EFAULT; | |
1958 | if (copy_from_user(page, buf, count)) | |
1959 | goto out_free; | |
1960 | ||
1961 | length = security_setprocattr(task, | |
2fddfeef | 1962 | (char*)file->f_path.dentry->d_name.name, |
28a6d671 EB |
1963 | (void*)page, count); |
1964 | out_free: | |
1965 | free_page((unsigned long) page); | |
1966 | out: | |
1967 | put_task_struct(task); | |
1968 | out_no_task: | |
1969 | return length; | |
1970 | } | |
1971 | ||
00977a59 | 1972 | static const struct file_operations proc_pid_attr_operations = { |
28a6d671 EB |
1973 | .read = proc_pid_attr_read, |
1974 | .write = proc_pid_attr_write, | |
1975 | }; | |
1976 | ||
c5141e6d | 1977 | static const struct pid_entry attr_dir_stuff[] = { |
61a28784 EB |
1978 | REG("current", S_IRUGO|S_IWUGO, pid_attr), |
1979 | REG("prev", S_IRUGO, pid_attr), | |
1980 | REG("exec", S_IRUGO|S_IWUGO, pid_attr), | |
1981 | REG("fscreate", S_IRUGO|S_IWUGO, pid_attr), | |
1982 | REG("keycreate", S_IRUGO|S_IWUGO, pid_attr), | |
1983 | REG("sockcreate", S_IRUGO|S_IWUGO, pid_attr), | |
28a6d671 EB |
1984 | }; |
1985 | ||
72d9dcfc | 1986 | static int proc_attr_dir_readdir(struct file * filp, |
28a6d671 EB |
1987 | void * dirent, filldir_t filldir) |
1988 | { | |
1989 | return proc_pident_readdir(filp,dirent,filldir, | |
72d9dcfc | 1990 | attr_dir_stuff,ARRAY_SIZE(attr_dir_stuff)); |
28a6d671 EB |
1991 | } |
1992 | ||
00977a59 | 1993 | static const struct file_operations proc_attr_dir_operations = { |
1da177e4 | 1994 | .read = generic_read_dir, |
72d9dcfc | 1995 | .readdir = proc_attr_dir_readdir, |
1da177e4 LT |
1996 | }; |
1997 | ||
72d9dcfc | 1998 | static struct dentry *proc_attr_dir_lookup(struct inode *dir, |
28a6d671 EB |
1999 | struct dentry *dentry, struct nameidata *nd) |
2000 | { | |
7bcd6b0e EB |
2001 | return proc_pident_lookup(dir, dentry, |
2002 | attr_dir_stuff, ARRAY_SIZE(attr_dir_stuff)); | |
28a6d671 EB |
2003 | } |
2004 | ||
c5ef1c42 | 2005 | static const struct inode_operations proc_attr_dir_inode_operations = { |
72d9dcfc | 2006 | .lookup = proc_attr_dir_lookup, |
99f89551 | 2007 | .getattr = pid_getattr, |
6d76fa58 | 2008 | .setattr = proc_setattr, |
1da177e4 LT |
2009 | }; |
2010 | ||
28a6d671 EB |
2011 | #endif |
2012 | ||
3cb4a0bb KH |
2013 | #if defined(USE_ELF_CORE_DUMP) && defined(CONFIG_ELF_CORE) |
2014 | static ssize_t proc_coredump_filter_read(struct file *file, char __user *buf, | |
2015 | size_t count, loff_t *ppos) | |
2016 | { | |
2017 | struct task_struct *task = get_proc_task(file->f_dentry->d_inode); | |
2018 | struct mm_struct *mm; | |
2019 | char buffer[PROC_NUMBUF]; | |
2020 | size_t len; | |
2021 | int ret; | |
2022 | ||
2023 | if (!task) | |
2024 | return -ESRCH; | |
2025 | ||
2026 | ret = 0; | |
2027 | mm = get_task_mm(task); | |
2028 | if (mm) { | |
2029 | len = snprintf(buffer, sizeof(buffer), "%08lx\n", | |
2030 | ((mm->flags & MMF_DUMP_FILTER_MASK) >> | |
2031 | MMF_DUMP_FILTER_SHIFT)); | |
2032 | mmput(mm); | |
2033 | ret = simple_read_from_buffer(buf, count, ppos, buffer, len); | |
2034 | } | |
2035 | ||
2036 | put_task_struct(task); | |
2037 | ||
2038 | return ret; | |
2039 | } | |
2040 | ||
2041 | static ssize_t proc_coredump_filter_write(struct file *file, | |
2042 | const char __user *buf, | |
2043 | size_t count, | |
2044 | loff_t *ppos) | |
2045 | { | |
2046 | struct task_struct *task; | |
2047 | struct mm_struct *mm; | |
2048 | char buffer[PROC_NUMBUF], *end; | |
2049 | unsigned int val; | |
2050 | int ret; | |
2051 | int i; | |
2052 | unsigned long mask; | |
2053 | ||
2054 | ret = -EFAULT; | |
2055 | memset(buffer, 0, sizeof(buffer)); | |
2056 | if (count > sizeof(buffer) - 1) | |
2057 | count = sizeof(buffer) - 1; | |
2058 | if (copy_from_user(buffer, buf, count)) | |
2059 | goto out_no_task; | |
2060 | ||
2061 | ret = -EINVAL; | |
2062 | val = (unsigned int)simple_strtoul(buffer, &end, 0); | |
2063 | if (*end == '\n') | |
2064 | end++; | |
2065 | if (end - buffer == 0) | |
2066 | goto out_no_task; | |
2067 | ||
2068 | ret = -ESRCH; | |
2069 | task = get_proc_task(file->f_dentry->d_inode); | |
2070 | if (!task) | |
2071 | goto out_no_task; | |
2072 | ||
2073 | ret = end - buffer; | |
2074 | mm = get_task_mm(task); | |
2075 | if (!mm) | |
2076 | goto out_no_mm; | |
2077 | ||
2078 | for (i = 0, mask = 1; i < MMF_DUMP_FILTER_BITS; i++, mask <<= 1) { | |
2079 | if (val & mask) | |
2080 | set_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags); | |
2081 | else | |
2082 | clear_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags); | |
2083 | } | |
2084 | ||
2085 | mmput(mm); | |
2086 | out_no_mm: | |
2087 | put_task_struct(task); | |
2088 | out_no_task: | |
2089 | return ret; | |
2090 | } | |
2091 | ||
2092 | static const struct file_operations proc_coredump_filter_operations = { | |
2093 | .read = proc_coredump_filter_read, | |
2094 | .write = proc_coredump_filter_write, | |
2095 | }; | |
2096 | #endif | |
2097 | ||
28a6d671 EB |
2098 | /* |
2099 | * /proc/self: | |
2100 | */ | |
2101 | static int proc_self_readlink(struct dentry *dentry, char __user *buffer, | |
2102 | int buflen) | |
2103 | { | |
488e5bc4 | 2104 | struct pid_namespace *ns = dentry->d_sb->s_fs_info; |
c6caeb7c | 2105 | pid_t pid = task_pid_nr_ns(current, ns); |
28a6d671 | 2106 | char tmp[PROC_NUMBUF]; |
c6caeb7c | 2107 | if (!pid) |
488e5bc4 | 2108 | return -ENOENT; |
c6caeb7c | 2109 | sprintf(tmp, "%d", pid); |
28a6d671 EB |
2110 | return vfs_readlink(dentry,buffer,buflen,tmp); |
2111 | } | |
2112 | ||
2113 | static void *proc_self_follow_link(struct dentry *dentry, struct nameidata *nd) | |
2114 | { | |
488e5bc4 | 2115 | struct pid_namespace *ns = dentry->d_sb->s_fs_info; |
c6caeb7c | 2116 | pid_t pid = task_pid_nr_ns(current, ns); |
28a6d671 | 2117 | char tmp[PROC_NUMBUF]; |
c6caeb7c | 2118 | if (!pid) |
488e5bc4 | 2119 | return ERR_PTR(-ENOENT); |
c6caeb7c | 2120 | sprintf(tmp, "%d", pid); |
28a6d671 EB |
2121 | return ERR_PTR(vfs_follow_link(nd,tmp)); |
2122 | } | |
2123 | ||
c5ef1c42 | 2124 | static const struct inode_operations proc_self_inode_operations = { |
28a6d671 EB |
2125 | .readlink = proc_self_readlink, |
2126 | .follow_link = proc_self_follow_link, | |
2127 | }; | |
2128 | ||
801199ce EB |
2129 | /* |
2130 | * proc base | |
2131 | * | |
2132 | * These are the directory entries in the root directory of /proc | |
2133 | * that properly belong to the /proc filesystem, as they describe | |
2134 | * describe something that is process related. | |
2135 | */ | |
c5141e6d | 2136 | static const struct pid_entry proc_base_stuff[] = { |
61a28784 | 2137 | NOD("self", S_IFLNK|S_IRWXUGO, |
801199ce | 2138 | &proc_self_inode_operations, NULL, {}), |
801199ce EB |
2139 | }; |
2140 | ||
2141 | /* | |
2142 | * Exceptional case: normally we are not allowed to unhash a busy | |
2143 | * directory. In this case, however, we can do it - no aliasing problems | |
2144 | * due to the way we treat inodes. | |
2145 | */ | |
2146 | static int proc_base_revalidate(struct dentry *dentry, struct nameidata *nd) | |
2147 | { | |
2148 | struct inode *inode = dentry->d_inode; | |
2149 | struct task_struct *task = get_proc_task(inode); | |
2150 | if (task) { | |
2151 | put_task_struct(task); | |
2152 | return 1; | |
2153 | } | |
2154 | d_drop(dentry); | |
2155 | return 0; | |
2156 | } | |
2157 | ||
2158 | static struct dentry_operations proc_base_dentry_operations = | |
2159 | { | |
2160 | .d_revalidate = proc_base_revalidate, | |
2161 | .d_delete = pid_delete_dentry, | |
2162 | }; | |
2163 | ||
444ceed8 | 2164 | static struct dentry *proc_base_instantiate(struct inode *dir, |
c5141e6d | 2165 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
801199ce | 2166 | { |
c5141e6d | 2167 | const struct pid_entry *p = ptr; |
801199ce | 2168 | struct inode *inode; |
801199ce | 2169 | struct proc_inode *ei; |
444ceed8 | 2170 | struct dentry *error = ERR_PTR(-EINVAL); |
801199ce EB |
2171 | |
2172 | /* Allocate the inode */ | |
2173 | error = ERR_PTR(-ENOMEM); | |
2174 | inode = new_inode(dir->i_sb); | |
2175 | if (!inode) | |
2176 | goto out; | |
2177 | ||
2178 | /* Initialize the inode */ | |
2179 | ei = PROC_I(inode); | |
2180 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; | |
801199ce EB |
2181 | |
2182 | /* | |
2183 | * grab the reference to the task. | |
2184 | */ | |
1a657f78 | 2185 | ei->pid = get_task_pid(task, PIDTYPE_PID); |
801199ce EB |
2186 | if (!ei->pid) |
2187 | goto out_iput; | |
2188 | ||
2189 | inode->i_uid = 0; | |
2190 | inode->i_gid = 0; | |
2191 | inode->i_mode = p->mode; | |
2192 | if (S_ISDIR(inode->i_mode)) | |
2193 | inode->i_nlink = 2; | |
2194 | if (S_ISLNK(inode->i_mode)) | |
2195 | inode->i_size = 64; | |
2196 | if (p->iop) | |
2197 | inode->i_op = p->iop; | |
2198 | if (p->fop) | |
2199 | inode->i_fop = p->fop; | |
2200 | ei->op = p->op; | |
2201 | dentry->d_op = &proc_base_dentry_operations; | |
2202 | d_add(dentry, inode); | |
2203 | error = NULL; | |
2204 | out: | |
801199ce EB |
2205 | return error; |
2206 | out_iput: | |
2207 | iput(inode); | |
2208 | goto out; | |
2209 | } | |
2210 | ||
444ceed8 EB |
2211 | static struct dentry *proc_base_lookup(struct inode *dir, struct dentry *dentry) |
2212 | { | |
2213 | struct dentry *error; | |
2214 | struct task_struct *task = get_proc_task(dir); | |
c5141e6d | 2215 | const struct pid_entry *p, *last; |
444ceed8 EB |
2216 | |
2217 | error = ERR_PTR(-ENOENT); | |
2218 | ||
2219 | if (!task) | |
2220 | goto out_no_task; | |
2221 | ||
2222 | /* Lookup the directory entry */ | |
7bcd6b0e EB |
2223 | last = &proc_base_stuff[ARRAY_SIZE(proc_base_stuff) - 1]; |
2224 | for (p = proc_base_stuff; p <= last; p++) { | |
444ceed8 EB |
2225 | if (p->len != dentry->d_name.len) |
2226 | continue; | |
2227 | if (!memcmp(dentry->d_name.name, p->name, p->len)) | |
2228 | break; | |
2229 | } | |
7bcd6b0e | 2230 | if (p > last) |
444ceed8 EB |
2231 | goto out; |
2232 | ||
2233 | error = proc_base_instantiate(dir, dentry, task, p); | |
2234 | ||
2235 | out: | |
2236 | put_task_struct(task); | |
2237 | out_no_task: | |
2238 | return error; | |
2239 | } | |
2240 | ||
c5141e6d ED |
2241 | static int proc_base_fill_cache(struct file *filp, void *dirent, |
2242 | filldir_t filldir, struct task_struct *task, const struct pid_entry *p) | |
61a28784 EB |
2243 | { |
2244 | return proc_fill_cache(filp, dirent, filldir, p->name, p->len, | |
2245 | proc_base_instantiate, task, p); | |
2246 | } | |
2247 | ||
aba76fdb AM |
2248 | #ifdef CONFIG_TASK_IO_ACCOUNTING |
2249 | static int proc_pid_io_accounting(struct task_struct *task, char *buffer) | |
2250 | { | |
2251 | return sprintf(buffer, | |
4b98d11b | 2252 | #ifdef CONFIG_TASK_XACCT |
aba76fdb AM |
2253 | "rchar: %llu\n" |
2254 | "wchar: %llu\n" | |
2255 | "syscr: %llu\n" | |
2256 | "syscw: %llu\n" | |
4b98d11b | 2257 | #endif |
aba76fdb AM |
2258 | "read_bytes: %llu\n" |
2259 | "write_bytes: %llu\n" | |
2260 | "cancelled_write_bytes: %llu\n", | |
4b98d11b | 2261 | #ifdef CONFIG_TASK_XACCT |
aba76fdb AM |
2262 | (unsigned long long)task->rchar, |
2263 | (unsigned long long)task->wchar, | |
2264 | (unsigned long long)task->syscr, | |
2265 | (unsigned long long)task->syscw, | |
4b98d11b | 2266 | #endif |
aba76fdb AM |
2267 | (unsigned long long)task->ioac.read_bytes, |
2268 | (unsigned long long)task->ioac.write_bytes, | |
2269 | (unsigned long long)task->ioac.cancelled_write_bytes); | |
2270 | } | |
2271 | #endif | |
2272 | ||
28a6d671 EB |
2273 | /* |
2274 | * Thread groups | |
2275 | */ | |
00977a59 | 2276 | static const struct file_operations proc_task_operations; |
c5ef1c42 | 2277 | static const struct inode_operations proc_task_inode_operations; |
20cdc894 | 2278 | |
c5141e6d | 2279 | static const struct pid_entry tgid_base_stuff[] = { |
61a28784 EB |
2280 | DIR("task", S_IRUGO|S_IXUGO, task), |
2281 | DIR("fd", S_IRUSR|S_IXUSR, fd), | |
27932742 | 2282 | DIR("fdinfo", S_IRUSR|S_IXUSR, fdinfo), |
315e28c8 | 2283 | REG("environ", S_IRUSR, environ), |
61a28784 | 2284 | INF("auxv", S_IRUSR, pid_auxv), |
df5f8314 | 2285 | ONE("status", S_IRUGO, pid_status), |
d85f50d5 | 2286 | INF("limits", S_IRUSR, pid_limits), |
43ae34cb IM |
2287 | #ifdef CONFIG_SCHED_DEBUG |
2288 | REG("sched", S_IRUGO|S_IWUSR, pid_sched), | |
2289 | #endif | |
61a28784 | 2290 | INF("cmdline", S_IRUGO, pid_cmdline), |
ee992744 | 2291 | ONE("stat", S_IRUGO, tgid_stat), |
a56d3fc7 | 2292 | ONE("statm", S_IRUGO, pid_statm), |
61a28784 | 2293 | REG("maps", S_IRUGO, maps), |
28a6d671 | 2294 | #ifdef CONFIG_NUMA |
61a28784 | 2295 | REG("numa_maps", S_IRUGO, numa_maps), |
28a6d671 | 2296 | #endif |
61a28784 | 2297 | REG("mem", S_IRUSR|S_IWUSR, mem), |
61a28784 EB |
2298 | LNK("cwd", cwd), |
2299 | LNK("root", root), | |
2300 | LNK("exe", exe), | |
2301 | REG("mounts", S_IRUGO, mounts), | |
2302 | REG("mountstats", S_IRUSR, mountstats), | |
1e883281 | 2303 | #ifdef CONFIG_PROC_PAGE_MONITOR |
b813e931 | 2304 | REG("clear_refs", S_IWUSR, clear_refs), |
61a28784 | 2305 | REG("smaps", S_IRUGO, smaps), |
85863e47 | 2306 | REG("pagemap", S_IRUSR, pagemap), |
28a6d671 EB |
2307 | #endif |
2308 | #ifdef CONFIG_SECURITY | |
72d9dcfc | 2309 | DIR("attr", S_IRUGO|S_IXUGO, attr_dir), |
28a6d671 EB |
2310 | #endif |
2311 | #ifdef CONFIG_KALLSYMS | |
61a28784 | 2312 | INF("wchan", S_IRUGO, pid_wchan), |
28a6d671 EB |
2313 | #endif |
2314 | #ifdef CONFIG_SCHEDSTATS | |
61a28784 | 2315 | INF("schedstat", S_IRUGO, pid_schedstat), |
28a6d671 | 2316 | #endif |
9745512c AV |
2317 | #ifdef CONFIG_LATENCYTOP |
2318 | REG("latency", S_IRUGO, lstats), | |
2319 | #endif | |
8793d854 | 2320 | #ifdef CONFIG_PROC_PID_CPUSET |
61a28784 | 2321 | REG("cpuset", S_IRUGO, cpuset), |
a424316c PM |
2322 | #endif |
2323 | #ifdef CONFIG_CGROUPS | |
2324 | REG("cgroup", S_IRUGO, cgroup), | |
28a6d671 | 2325 | #endif |
61a28784 EB |
2326 | INF("oom_score", S_IRUGO, oom_score), |
2327 | REG("oom_adj", S_IRUGO|S_IWUSR, oom_adjust), | |
28a6d671 | 2328 | #ifdef CONFIG_AUDITSYSCALL |
61a28784 | 2329 | REG("loginuid", S_IWUSR|S_IRUGO, loginuid), |
28a6d671 | 2330 | #endif |
f4f154fd AM |
2331 | #ifdef CONFIG_FAULT_INJECTION |
2332 | REG("make-it-fail", S_IRUGO|S_IWUSR, fault_inject), | |
2333 | #endif | |
3cb4a0bb KH |
2334 | #if defined(USE_ELF_CORE_DUMP) && defined(CONFIG_ELF_CORE) |
2335 | REG("coredump_filter", S_IRUGO|S_IWUSR, coredump_filter), | |
2336 | #endif | |
aba76fdb AM |
2337 | #ifdef CONFIG_TASK_IO_ACCOUNTING |
2338 | INF("io", S_IRUGO, pid_io_accounting), | |
2339 | #endif | |
28a6d671 | 2340 | }; |
1da177e4 | 2341 | |
28a6d671 | 2342 | static int proc_tgid_base_readdir(struct file * filp, |
1da177e4 LT |
2343 | void * dirent, filldir_t filldir) |
2344 | { | |
2345 | return proc_pident_readdir(filp,dirent,filldir, | |
28a6d671 | 2346 | tgid_base_stuff,ARRAY_SIZE(tgid_base_stuff)); |
1da177e4 LT |
2347 | } |
2348 | ||
00977a59 | 2349 | static const struct file_operations proc_tgid_base_operations = { |
1da177e4 | 2350 | .read = generic_read_dir, |
28a6d671 | 2351 | .readdir = proc_tgid_base_readdir, |
1da177e4 LT |
2352 | }; |
2353 | ||
28a6d671 | 2354 | static struct dentry *proc_tgid_base_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd){ |
7bcd6b0e EB |
2355 | return proc_pident_lookup(dir, dentry, |
2356 | tgid_base_stuff, ARRAY_SIZE(tgid_base_stuff)); | |
1da177e4 LT |
2357 | } |
2358 | ||
c5ef1c42 | 2359 | static const struct inode_operations proc_tgid_base_inode_operations = { |
28a6d671 | 2360 | .lookup = proc_tgid_base_lookup, |
99f89551 | 2361 | .getattr = pid_getattr, |
6d76fa58 | 2362 | .setattr = proc_setattr, |
1da177e4 | 2363 | }; |
1da177e4 | 2364 | |
60347f67 | 2365 | static void proc_flush_task_mnt(struct vfsmount *mnt, pid_t pid, pid_t tgid) |
1da177e4 | 2366 | { |
48e6484d | 2367 | struct dentry *dentry, *leader, *dir; |
8578cea7 | 2368 | char buf[PROC_NUMBUF]; |
48e6484d EB |
2369 | struct qstr name; |
2370 | ||
2371 | name.name = buf; | |
60347f67 PE |
2372 | name.len = snprintf(buf, sizeof(buf), "%d", pid); |
2373 | dentry = d_hash_and_lookup(mnt->mnt_root, &name); | |
48e6484d | 2374 | if (dentry) { |
7766755a AA |
2375 | if (!(current->flags & PF_EXITING)) |
2376 | shrink_dcache_parent(dentry); | |
48e6484d EB |
2377 | d_drop(dentry); |
2378 | dput(dentry); | |
2379 | } | |
1da177e4 | 2380 | |
60347f67 | 2381 | if (tgid == 0) |
48e6484d | 2382 | goto out; |
1da177e4 | 2383 | |
48e6484d | 2384 | name.name = buf; |
60347f67 PE |
2385 | name.len = snprintf(buf, sizeof(buf), "%d", tgid); |
2386 | leader = d_hash_and_lookup(mnt->mnt_root, &name); | |
48e6484d EB |
2387 | if (!leader) |
2388 | goto out; | |
1da177e4 | 2389 | |
48e6484d EB |
2390 | name.name = "task"; |
2391 | name.len = strlen(name.name); | |
2392 | dir = d_hash_and_lookup(leader, &name); | |
2393 | if (!dir) | |
2394 | goto out_put_leader; | |
2395 | ||
2396 | name.name = buf; | |
60347f67 | 2397 | name.len = snprintf(buf, sizeof(buf), "%d", pid); |
48e6484d EB |
2398 | dentry = d_hash_and_lookup(dir, &name); |
2399 | if (dentry) { | |
2400 | shrink_dcache_parent(dentry); | |
2401 | d_drop(dentry); | |
2402 | dput(dentry); | |
1da177e4 | 2403 | } |
48e6484d EB |
2404 | |
2405 | dput(dir); | |
2406 | out_put_leader: | |
2407 | dput(leader); | |
2408 | out: | |
2409 | return; | |
1da177e4 LT |
2410 | } |
2411 | ||
0895e91d RD |
2412 | /** |
2413 | * proc_flush_task - Remove dcache entries for @task from the /proc dcache. | |
2414 | * @task: task that should be flushed. | |
2415 | * | |
2416 | * When flushing dentries from proc, one needs to flush them from global | |
60347f67 | 2417 | * proc (proc_mnt) and from all the namespaces' procs this task was seen |
0895e91d RD |
2418 | * in. This call is supposed to do all of this job. |
2419 | * | |
2420 | * Looks in the dcache for | |
2421 | * /proc/@pid | |
2422 | * /proc/@tgid/task/@pid | |
2423 | * if either directory is present flushes it and all of it'ts children | |
2424 | * from the dcache. | |
2425 | * | |
2426 | * It is safe and reasonable to cache /proc entries for a task until | |
2427 | * that task exits. After that they just clog up the dcache with | |
2428 | * useless entries, possibly causing useful dcache entries to be | |
2429 | * flushed instead. This routine is proved to flush those useless | |
2430 | * dcache entries at process exit time. | |
2431 | * | |
2432 | * NOTE: This routine is just an optimization so it does not guarantee | |
2433 | * that no dcache entries will exist at process exit time it | |
2434 | * just makes it very unlikely that any will persist. | |
60347f67 PE |
2435 | */ |
2436 | ||
2437 | void proc_flush_task(struct task_struct *task) | |
2438 | { | |
9fcc2d15 EB |
2439 | int i; |
2440 | struct pid *pid, *tgid = NULL; | |
130f77ec PE |
2441 | struct upid *upid; |
2442 | ||
130f77ec | 2443 | pid = task_pid(task); |
9fcc2d15 EB |
2444 | if (thread_group_leader(task)) |
2445 | tgid = task_tgid(task); | |
130f77ec | 2446 | |
9fcc2d15 | 2447 | for (i = 0; i <= pid->level; i++) { |
130f77ec PE |
2448 | upid = &pid->numbers[i]; |
2449 | proc_flush_task_mnt(upid->ns->proc_mnt, upid->nr, | |
9fcc2d15 | 2450 | tgid ? tgid->numbers[i].nr : 0); |
130f77ec | 2451 | } |
6f4e6433 PE |
2452 | |
2453 | upid = &pid->numbers[pid->level]; | |
2454 | if (upid->nr == 1) | |
2455 | pid_ns_release_proc(upid->ns); | |
60347f67 PE |
2456 | } |
2457 | ||
9711ef99 AB |
2458 | static struct dentry *proc_pid_instantiate(struct inode *dir, |
2459 | struct dentry * dentry, | |
c5141e6d | 2460 | struct task_struct *task, const void *ptr) |
444ceed8 EB |
2461 | { |
2462 | struct dentry *error = ERR_PTR(-ENOENT); | |
2463 | struct inode *inode; | |
2464 | ||
61a28784 | 2465 | inode = proc_pid_make_inode(dir->i_sb, task); |
444ceed8 EB |
2466 | if (!inode) |
2467 | goto out; | |
2468 | ||
2469 | inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO; | |
2470 | inode->i_op = &proc_tgid_base_inode_operations; | |
2471 | inode->i_fop = &proc_tgid_base_operations; | |
2472 | inode->i_flags|=S_IMMUTABLE; | |
27932742 | 2473 | inode->i_nlink = 5; |
444ceed8 EB |
2474 | #ifdef CONFIG_SECURITY |
2475 | inode->i_nlink += 1; | |
2476 | #endif | |
2477 | ||
2478 | dentry->d_op = &pid_dentry_operations; | |
2479 | ||
2480 | d_add(dentry, inode); | |
2481 | /* Close the race of the process dying before we return the dentry */ | |
2482 | if (pid_revalidate(dentry, NULL)) | |
2483 | error = NULL; | |
2484 | out: | |
2485 | return error; | |
2486 | } | |
2487 | ||
1da177e4 LT |
2488 | struct dentry *proc_pid_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd) |
2489 | { | |
cd6a3ce9 | 2490 | struct dentry *result = ERR_PTR(-ENOENT); |
1da177e4 | 2491 | struct task_struct *task; |
1da177e4 | 2492 | unsigned tgid; |
b488893a | 2493 | struct pid_namespace *ns; |
1da177e4 | 2494 | |
801199ce EB |
2495 | result = proc_base_lookup(dir, dentry); |
2496 | if (!IS_ERR(result) || PTR_ERR(result) != -ENOENT) | |
2497 | goto out; | |
2498 | ||
1da177e4 LT |
2499 | tgid = name_to_int(dentry); |
2500 | if (tgid == ~0U) | |
2501 | goto out; | |
2502 | ||
b488893a | 2503 | ns = dentry->d_sb->s_fs_info; |
de758734 | 2504 | rcu_read_lock(); |
b488893a | 2505 | task = find_task_by_pid_ns(tgid, ns); |
1da177e4 LT |
2506 | if (task) |
2507 | get_task_struct(task); | |
de758734 | 2508 | rcu_read_unlock(); |
1da177e4 LT |
2509 | if (!task) |
2510 | goto out; | |
2511 | ||
444ceed8 | 2512 | result = proc_pid_instantiate(dir, dentry, task, NULL); |
1da177e4 | 2513 | put_task_struct(task); |
1da177e4 | 2514 | out: |
cd6a3ce9 | 2515 | return result; |
1da177e4 LT |
2516 | } |
2517 | ||
1da177e4 | 2518 | /* |
0804ef4b | 2519 | * Find the first task with tgid >= tgid |
0bc58a91 | 2520 | * |
1da177e4 | 2521 | */ |
19fd4bb2 EB |
2522 | struct tgid_iter { |
2523 | unsigned int tgid; | |
0804ef4b | 2524 | struct task_struct *task; |
19fd4bb2 EB |
2525 | }; |
2526 | static struct tgid_iter next_tgid(struct pid_namespace *ns, struct tgid_iter iter) | |
2527 | { | |
0804ef4b | 2528 | struct pid *pid; |
1da177e4 | 2529 | |
19fd4bb2 EB |
2530 | if (iter.task) |
2531 | put_task_struct(iter.task); | |
454cc105 | 2532 | rcu_read_lock(); |
0804ef4b | 2533 | retry: |
19fd4bb2 EB |
2534 | iter.task = NULL; |
2535 | pid = find_ge_pid(iter.tgid, ns); | |
0804ef4b | 2536 | if (pid) { |
19fd4bb2 EB |
2537 | iter.tgid = pid_nr_ns(pid, ns); |
2538 | iter.task = pid_task(pid, PIDTYPE_PID); | |
0804ef4b EB |
2539 | /* What we to know is if the pid we have find is the |
2540 | * pid of a thread_group_leader. Testing for task | |
2541 | * being a thread_group_leader is the obvious thing | |
2542 | * todo but there is a window when it fails, due to | |
2543 | * the pid transfer logic in de_thread. | |
2544 | * | |
2545 | * So we perform the straight forward test of seeing | |
2546 | * if the pid we have found is the pid of a thread | |
2547 | * group leader, and don't worry if the task we have | |
2548 | * found doesn't happen to be a thread group leader. | |
2549 | * As we don't care in the case of readdir. | |
2550 | */ | |
19fd4bb2 EB |
2551 | if (!iter.task || !has_group_leader_pid(iter.task)) { |
2552 | iter.tgid += 1; | |
0804ef4b | 2553 | goto retry; |
19fd4bb2 EB |
2554 | } |
2555 | get_task_struct(iter.task); | |
0bc58a91 | 2556 | } |
454cc105 | 2557 | rcu_read_unlock(); |
19fd4bb2 | 2558 | return iter; |
1da177e4 LT |
2559 | } |
2560 | ||
7bcd6b0e | 2561 | #define TGID_OFFSET (FIRST_PROCESS_ENTRY + ARRAY_SIZE(proc_base_stuff)) |
0804ef4b | 2562 | |
61a28784 | 2563 | static int proc_pid_fill_cache(struct file *filp, void *dirent, filldir_t filldir, |
19fd4bb2 | 2564 | struct tgid_iter iter) |
61a28784 EB |
2565 | { |
2566 | char name[PROC_NUMBUF]; | |
19fd4bb2 | 2567 | int len = snprintf(name, sizeof(name), "%d", iter.tgid); |
61a28784 | 2568 | return proc_fill_cache(filp, dirent, filldir, name, len, |
19fd4bb2 | 2569 | proc_pid_instantiate, iter.task, NULL); |
61a28784 EB |
2570 | } |
2571 | ||
1da177e4 LT |
2572 | /* for the /proc/ directory itself, after non-process stuff has been done */ |
2573 | int proc_pid_readdir(struct file * filp, void * dirent, filldir_t filldir) | |
2574 | { | |
1da177e4 | 2575 | unsigned int nr = filp->f_pos - FIRST_PROCESS_ENTRY; |
2fddfeef | 2576 | struct task_struct *reaper = get_proc_task(filp->f_path.dentry->d_inode); |
19fd4bb2 | 2577 | struct tgid_iter iter; |
b488893a | 2578 | struct pid_namespace *ns; |
1da177e4 | 2579 | |
61a28784 EB |
2580 | if (!reaper) |
2581 | goto out_no_task; | |
2582 | ||
7bcd6b0e | 2583 | for (; nr < ARRAY_SIZE(proc_base_stuff); filp->f_pos++, nr++) { |
c5141e6d | 2584 | const struct pid_entry *p = &proc_base_stuff[nr]; |
61a28784 | 2585 | if (proc_base_fill_cache(filp, dirent, filldir, reaper, p) < 0) |
801199ce | 2586 | goto out; |
1da177e4 LT |
2587 | } |
2588 | ||
b488893a | 2589 | ns = filp->f_dentry->d_sb->s_fs_info; |
19fd4bb2 EB |
2590 | iter.task = NULL; |
2591 | iter.tgid = filp->f_pos - TGID_OFFSET; | |
2592 | for (iter = next_tgid(ns, iter); | |
2593 | iter.task; | |
2594 | iter.tgid += 1, iter = next_tgid(ns, iter)) { | |
2595 | filp->f_pos = iter.tgid + TGID_OFFSET; | |
2596 | if (proc_pid_fill_cache(filp, dirent, filldir, iter) < 0) { | |
2597 | put_task_struct(iter.task); | |
0804ef4b | 2598 | goto out; |
1da177e4 | 2599 | } |
0bc58a91 | 2600 | } |
0804ef4b EB |
2601 | filp->f_pos = PID_MAX_LIMIT + TGID_OFFSET; |
2602 | out: | |
61a28784 EB |
2603 | put_task_struct(reaper); |
2604 | out_no_task: | |
0bc58a91 EB |
2605 | return 0; |
2606 | } | |
1da177e4 | 2607 | |
28a6d671 EB |
2608 | /* |
2609 | * Tasks | |
2610 | */ | |
c5141e6d | 2611 | static const struct pid_entry tid_base_stuff[] = { |
61a28784 | 2612 | DIR("fd", S_IRUSR|S_IXUSR, fd), |
27932742 | 2613 | DIR("fdinfo", S_IRUSR|S_IXUSR, fdinfo), |
315e28c8 | 2614 | REG("environ", S_IRUSR, environ), |
61a28784 | 2615 | INF("auxv", S_IRUSR, pid_auxv), |
df5f8314 | 2616 | ONE("status", S_IRUGO, pid_status), |
d85f50d5 | 2617 | INF("limits", S_IRUSR, pid_limits), |
43ae34cb IM |
2618 | #ifdef CONFIG_SCHED_DEBUG |
2619 | REG("sched", S_IRUGO|S_IWUSR, pid_sched), | |
2620 | #endif | |
61a28784 | 2621 | INF("cmdline", S_IRUGO, pid_cmdline), |
ee992744 | 2622 | ONE("stat", S_IRUGO, tid_stat), |
a56d3fc7 | 2623 | ONE("statm", S_IRUGO, pid_statm), |
61a28784 | 2624 | REG("maps", S_IRUGO, maps), |
28a6d671 | 2625 | #ifdef CONFIG_NUMA |
61a28784 | 2626 | REG("numa_maps", S_IRUGO, numa_maps), |
28a6d671 | 2627 | #endif |
61a28784 | 2628 | REG("mem", S_IRUSR|S_IWUSR, mem), |
61a28784 EB |
2629 | LNK("cwd", cwd), |
2630 | LNK("root", root), | |
2631 | LNK("exe", exe), | |
2632 | REG("mounts", S_IRUGO, mounts), | |
1e883281 | 2633 | #ifdef CONFIG_PROC_PAGE_MONITOR |
b813e931 | 2634 | REG("clear_refs", S_IWUSR, clear_refs), |
61a28784 | 2635 | REG("smaps", S_IRUGO, smaps), |
85863e47 | 2636 | REG("pagemap", S_IRUSR, pagemap), |
28a6d671 EB |
2637 | #endif |
2638 | #ifdef CONFIG_SECURITY | |
72d9dcfc | 2639 | DIR("attr", S_IRUGO|S_IXUGO, attr_dir), |
28a6d671 EB |
2640 | #endif |
2641 | #ifdef CONFIG_KALLSYMS | |
61a28784 | 2642 | INF("wchan", S_IRUGO, pid_wchan), |
28a6d671 EB |
2643 | #endif |
2644 | #ifdef CONFIG_SCHEDSTATS | |
61a28784 | 2645 | INF("schedstat", S_IRUGO, pid_schedstat), |
28a6d671 | 2646 | #endif |
9745512c AV |
2647 | #ifdef CONFIG_LATENCYTOP |
2648 | REG("latency", S_IRUGO, lstats), | |
2649 | #endif | |
8793d854 | 2650 | #ifdef CONFIG_PROC_PID_CPUSET |
61a28784 | 2651 | REG("cpuset", S_IRUGO, cpuset), |
a424316c PM |
2652 | #endif |
2653 | #ifdef CONFIG_CGROUPS | |
2654 | REG("cgroup", S_IRUGO, cgroup), | |
28a6d671 | 2655 | #endif |
61a28784 EB |
2656 | INF("oom_score", S_IRUGO, oom_score), |
2657 | REG("oom_adj", S_IRUGO|S_IWUSR, oom_adjust), | |
28a6d671 | 2658 | #ifdef CONFIG_AUDITSYSCALL |
61a28784 | 2659 | REG("loginuid", S_IWUSR|S_IRUGO, loginuid), |
28a6d671 | 2660 | #endif |
f4f154fd AM |
2661 | #ifdef CONFIG_FAULT_INJECTION |
2662 | REG("make-it-fail", S_IRUGO|S_IWUSR, fault_inject), | |
2663 | #endif | |
28a6d671 EB |
2664 | }; |
2665 | ||
2666 | static int proc_tid_base_readdir(struct file * filp, | |
2667 | void * dirent, filldir_t filldir) | |
2668 | { | |
2669 | return proc_pident_readdir(filp,dirent,filldir, | |
2670 | tid_base_stuff,ARRAY_SIZE(tid_base_stuff)); | |
2671 | } | |
2672 | ||
2673 | static struct dentry *proc_tid_base_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd){ | |
7bcd6b0e EB |
2674 | return proc_pident_lookup(dir, dentry, |
2675 | tid_base_stuff, ARRAY_SIZE(tid_base_stuff)); | |
28a6d671 EB |
2676 | } |
2677 | ||
00977a59 | 2678 | static const struct file_operations proc_tid_base_operations = { |
28a6d671 EB |
2679 | .read = generic_read_dir, |
2680 | .readdir = proc_tid_base_readdir, | |
2681 | }; | |
2682 | ||
c5ef1c42 | 2683 | static const struct inode_operations proc_tid_base_inode_operations = { |
28a6d671 EB |
2684 | .lookup = proc_tid_base_lookup, |
2685 | .getattr = pid_getattr, | |
2686 | .setattr = proc_setattr, | |
2687 | }; | |
2688 | ||
444ceed8 | 2689 | static struct dentry *proc_task_instantiate(struct inode *dir, |
c5141e6d | 2690 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
444ceed8 EB |
2691 | { |
2692 | struct dentry *error = ERR_PTR(-ENOENT); | |
2693 | struct inode *inode; | |
61a28784 | 2694 | inode = proc_pid_make_inode(dir->i_sb, task); |
444ceed8 EB |
2695 | |
2696 | if (!inode) | |
2697 | goto out; | |
2698 | inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO; | |
2699 | inode->i_op = &proc_tid_base_inode_operations; | |
2700 | inode->i_fop = &proc_tid_base_operations; | |
2701 | inode->i_flags|=S_IMMUTABLE; | |
27932742 | 2702 | inode->i_nlink = 4; |
444ceed8 EB |
2703 | #ifdef CONFIG_SECURITY |
2704 | inode->i_nlink += 1; | |
2705 | #endif | |
2706 | ||
2707 | dentry->d_op = &pid_dentry_operations; | |
2708 | ||
2709 | d_add(dentry, inode); | |
2710 | /* Close the race of the process dying before we return the dentry */ | |
2711 | if (pid_revalidate(dentry, NULL)) | |
2712 | error = NULL; | |
2713 | out: | |
2714 | return error; | |
2715 | } | |
2716 | ||
28a6d671 EB |
2717 | static struct dentry *proc_task_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd) |
2718 | { | |
2719 | struct dentry *result = ERR_PTR(-ENOENT); | |
2720 | struct task_struct *task; | |
2721 | struct task_struct *leader = get_proc_task(dir); | |
28a6d671 | 2722 | unsigned tid; |
b488893a | 2723 | struct pid_namespace *ns; |
28a6d671 EB |
2724 | |
2725 | if (!leader) | |
2726 | goto out_no_task; | |
2727 | ||
2728 | tid = name_to_int(dentry); | |
2729 | if (tid == ~0U) | |
2730 | goto out; | |
2731 | ||
b488893a | 2732 | ns = dentry->d_sb->s_fs_info; |
28a6d671 | 2733 | rcu_read_lock(); |
b488893a | 2734 | task = find_task_by_pid_ns(tid, ns); |
28a6d671 EB |
2735 | if (task) |
2736 | get_task_struct(task); | |
2737 | rcu_read_unlock(); | |
2738 | if (!task) | |
2739 | goto out; | |
bac0abd6 | 2740 | if (!same_thread_group(leader, task)) |
28a6d671 EB |
2741 | goto out_drop_task; |
2742 | ||
444ceed8 | 2743 | result = proc_task_instantiate(dir, dentry, task, NULL); |
28a6d671 EB |
2744 | out_drop_task: |
2745 | put_task_struct(task); | |
2746 | out: | |
2747 | put_task_struct(leader); | |
2748 | out_no_task: | |
2749 | return result; | |
2750 | } | |
2751 | ||
0bc58a91 EB |
2752 | /* |
2753 | * Find the first tid of a thread group to return to user space. | |
2754 | * | |
2755 | * Usually this is just the thread group leader, but if the users | |
2756 | * buffer was too small or there was a seek into the middle of the | |
2757 | * directory we have more work todo. | |
2758 | * | |
2759 | * In the case of a short read we start with find_task_by_pid. | |
2760 | * | |
2761 | * In the case of a seek we start with the leader and walk nr | |
2762 | * threads past it. | |
2763 | */ | |
cc288738 | 2764 | static struct task_struct *first_tid(struct task_struct *leader, |
b488893a | 2765 | int tid, int nr, struct pid_namespace *ns) |
0bc58a91 | 2766 | { |
a872ff0c | 2767 | struct task_struct *pos; |
1da177e4 | 2768 | |
cc288738 | 2769 | rcu_read_lock(); |
0bc58a91 EB |
2770 | /* Attempt to start with the pid of a thread */ |
2771 | if (tid && (nr > 0)) { | |
b488893a | 2772 | pos = find_task_by_pid_ns(tid, ns); |
a872ff0c ON |
2773 | if (pos && (pos->group_leader == leader)) |
2774 | goto found; | |
0bc58a91 | 2775 | } |
1da177e4 | 2776 | |
0bc58a91 | 2777 | /* If nr exceeds the number of threads there is nothing todo */ |
a872ff0c ON |
2778 | pos = NULL; |
2779 | if (nr && nr >= get_nr_threads(leader)) | |
2780 | goto out; | |
1da177e4 | 2781 | |
a872ff0c ON |
2782 | /* If we haven't found our starting place yet start |
2783 | * with the leader and walk nr threads forward. | |
0bc58a91 | 2784 | */ |
a872ff0c ON |
2785 | for (pos = leader; nr > 0; --nr) { |
2786 | pos = next_thread(pos); | |
2787 | if (pos == leader) { | |
2788 | pos = NULL; | |
2789 | goto out; | |
2790 | } | |
1da177e4 | 2791 | } |
a872ff0c ON |
2792 | found: |
2793 | get_task_struct(pos); | |
2794 | out: | |
cc288738 | 2795 | rcu_read_unlock(); |
0bc58a91 EB |
2796 | return pos; |
2797 | } | |
2798 | ||
2799 | /* | |
2800 | * Find the next thread in the thread list. | |
2801 | * Return NULL if there is an error or no next thread. | |
2802 | * | |
2803 | * The reference to the input task_struct is released. | |
2804 | */ | |
2805 | static struct task_struct *next_tid(struct task_struct *start) | |
2806 | { | |
c1df7fb8 | 2807 | struct task_struct *pos = NULL; |
cc288738 | 2808 | rcu_read_lock(); |
c1df7fb8 | 2809 | if (pid_alive(start)) { |
0bc58a91 | 2810 | pos = next_thread(start); |
c1df7fb8 ON |
2811 | if (thread_group_leader(pos)) |
2812 | pos = NULL; | |
2813 | else | |
2814 | get_task_struct(pos); | |
2815 | } | |
cc288738 | 2816 | rcu_read_unlock(); |
0bc58a91 EB |
2817 | put_task_struct(start); |
2818 | return pos; | |
1da177e4 LT |
2819 | } |
2820 | ||
61a28784 EB |
2821 | static int proc_task_fill_cache(struct file *filp, void *dirent, filldir_t filldir, |
2822 | struct task_struct *task, int tid) | |
2823 | { | |
2824 | char name[PROC_NUMBUF]; | |
2825 | int len = snprintf(name, sizeof(name), "%d", tid); | |
2826 | return proc_fill_cache(filp, dirent, filldir, name, len, | |
2827 | proc_task_instantiate, task, NULL); | |
2828 | } | |
2829 | ||
1da177e4 LT |
2830 | /* for the /proc/TGID/task/ directories */ |
2831 | static int proc_task_readdir(struct file * filp, void * dirent, filldir_t filldir) | |
2832 | { | |
2fddfeef | 2833 | struct dentry *dentry = filp->f_path.dentry; |
1da177e4 | 2834 | struct inode *inode = dentry->d_inode; |
7d895244 | 2835 | struct task_struct *leader = NULL; |
0bc58a91 | 2836 | struct task_struct *task; |
1da177e4 LT |
2837 | int retval = -ENOENT; |
2838 | ino_t ino; | |
0bc58a91 | 2839 | int tid; |
1da177e4 | 2840 | unsigned long pos = filp->f_pos; /* avoiding "long long" filp->f_pos */ |
b488893a | 2841 | struct pid_namespace *ns; |
1da177e4 | 2842 | |
7d895244 GC |
2843 | task = get_proc_task(inode); |
2844 | if (!task) | |
2845 | goto out_no_task; | |
2846 | rcu_read_lock(); | |
2847 | if (pid_alive(task)) { | |
2848 | leader = task->group_leader; | |
2849 | get_task_struct(leader); | |
2850 | } | |
2851 | rcu_read_unlock(); | |
2852 | put_task_struct(task); | |
99f89551 EB |
2853 | if (!leader) |
2854 | goto out_no_task; | |
1da177e4 LT |
2855 | retval = 0; |
2856 | ||
2857 | switch (pos) { | |
2858 | case 0: | |
2859 | ino = inode->i_ino; | |
2860 | if (filldir(dirent, ".", 1, pos, ino, DT_DIR) < 0) | |
2861 | goto out; | |
2862 | pos++; | |
2863 | /* fall through */ | |
2864 | case 1: | |
2865 | ino = parent_ino(dentry); | |
2866 | if (filldir(dirent, "..", 2, pos, ino, DT_DIR) < 0) | |
2867 | goto out; | |
2868 | pos++; | |
2869 | /* fall through */ | |
2870 | } | |
2871 | ||
0bc58a91 EB |
2872 | /* f_version caches the tgid value that the last readdir call couldn't |
2873 | * return. lseek aka telldir automagically resets f_version to 0. | |
2874 | */ | |
b488893a | 2875 | ns = filp->f_dentry->d_sb->s_fs_info; |
2b47c361 | 2876 | tid = (int)filp->f_version; |
0bc58a91 | 2877 | filp->f_version = 0; |
b488893a | 2878 | for (task = first_tid(leader, tid, pos - 2, ns); |
0bc58a91 EB |
2879 | task; |
2880 | task = next_tid(task), pos++) { | |
b488893a | 2881 | tid = task_pid_nr_ns(task, ns); |
61a28784 | 2882 | if (proc_task_fill_cache(filp, dirent, filldir, task, tid) < 0) { |
0bc58a91 EB |
2883 | /* returning this tgid failed, save it as the first |
2884 | * pid for the next readir call */ | |
2b47c361 | 2885 | filp->f_version = (u64)tid; |
0bc58a91 | 2886 | put_task_struct(task); |
1da177e4 | 2887 | break; |
0bc58a91 | 2888 | } |
1da177e4 LT |
2889 | } |
2890 | out: | |
2891 | filp->f_pos = pos; | |
99f89551 EB |
2892 | put_task_struct(leader); |
2893 | out_no_task: | |
1da177e4 LT |
2894 | return retval; |
2895 | } | |
6e66b52b EB |
2896 | |
2897 | static int proc_task_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) | |
2898 | { | |
2899 | struct inode *inode = dentry->d_inode; | |
99f89551 | 2900 | struct task_struct *p = get_proc_task(inode); |
6e66b52b EB |
2901 | generic_fillattr(inode, stat); |
2902 | ||
99f89551 EB |
2903 | if (p) { |
2904 | rcu_read_lock(); | |
2905 | stat->nlink += get_nr_threads(p); | |
2906 | rcu_read_unlock(); | |
2907 | put_task_struct(p); | |
6e66b52b EB |
2908 | } |
2909 | ||
2910 | return 0; | |
2911 | } | |
28a6d671 | 2912 | |
c5ef1c42 | 2913 | static const struct inode_operations proc_task_inode_operations = { |
28a6d671 EB |
2914 | .lookup = proc_task_lookup, |
2915 | .getattr = proc_task_getattr, | |
2916 | .setattr = proc_setattr, | |
2917 | }; | |
2918 | ||
00977a59 | 2919 | static const struct file_operations proc_task_operations = { |
28a6d671 EB |
2920 | .read = generic_read_dir, |
2921 | .readdir = proc_task_readdir, | |
2922 | }; |