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 | ||
3dcd25f3 | 156 | static int proc_cwd_link(struct inode *inode, struct path *path) |
0494f6ec | 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); | |
3dcd25f3 JB |
168 | *path = fs->pwd; |
169 | path_get(&fs->pwd); | |
1da177e4 LT |
170 | read_unlock(&fs->lock); |
171 | result = 0; | |
172 | put_fs_struct(fs); | |
173 | } | |
174 | return result; | |
175 | } | |
176 | ||
3dcd25f3 | 177 | static int proc_root_link(struct inode *inode, struct path *path) |
1da177e4 | 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); | |
3dcd25f3 JB |
189 | *path = fs->root; |
190 | path_get(&fs->root); | |
1da177e4 LT |
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; | |
13d77c37 HS |
317 | struct inode *inode = m->private; |
318 | struct task_struct *task = get_proc_task(inode); | |
9745512c | 319 | |
13d77c37 HS |
320 | if (!task) |
321 | return -ESRCH; | |
322 | seq_puts(m, "Latency Top version : v0.1\n"); | |
9745512c AV |
323 | for (i = 0; i < 32; i++) { |
324 | if (task->latency_record[i].backtrace[0]) { | |
325 | int q; | |
326 | seq_printf(m, "%i %li %li ", | |
327 | task->latency_record[i].count, | |
328 | task->latency_record[i].time, | |
329 | task->latency_record[i].max); | |
330 | for (q = 0; q < LT_BACKTRACEDEPTH; q++) { | |
331 | char sym[KSYM_NAME_LEN]; | |
332 | char *c; | |
333 | if (!task->latency_record[i].backtrace[q]) | |
334 | break; | |
335 | if (task->latency_record[i].backtrace[q] == ULONG_MAX) | |
336 | break; | |
337 | sprint_symbol(sym, task->latency_record[i].backtrace[q]); | |
338 | c = strchr(sym, '+'); | |
339 | if (c) | |
340 | *c = 0; | |
341 | seq_printf(m, "%s ", sym); | |
342 | } | |
343 | seq_printf(m, "\n"); | |
344 | } | |
345 | ||
346 | } | |
13d77c37 | 347 | put_task_struct(task); |
9745512c AV |
348 | return 0; |
349 | } | |
350 | ||
351 | static int lstats_open(struct inode *inode, struct file *file) | |
352 | { | |
13d77c37 | 353 | return single_open(file, lstats_show_proc, inode); |
d6643d12 HS |
354 | } |
355 | ||
9745512c AV |
356 | static ssize_t lstats_write(struct file *file, const char __user *buf, |
357 | size_t count, loff_t *offs) | |
358 | { | |
13d77c37 | 359 | struct task_struct *task = get_proc_task(file->f_dentry->d_inode); |
9745512c | 360 | |
13d77c37 HS |
361 | if (!task) |
362 | return -ESRCH; | |
9745512c | 363 | clear_all_latency_tracing(task); |
13d77c37 | 364 | put_task_struct(task); |
9745512c AV |
365 | |
366 | return count; | |
367 | } | |
368 | ||
369 | static const struct file_operations proc_lstats_operations = { | |
370 | .open = lstats_open, | |
371 | .read = seq_read, | |
372 | .write = lstats_write, | |
373 | .llseek = seq_lseek, | |
13d77c37 | 374 | .release = single_release, |
9745512c AV |
375 | }; |
376 | ||
377 | #endif | |
378 | ||
1da177e4 LT |
379 | /* The badness from the OOM killer */ |
380 | unsigned long badness(struct task_struct *p, unsigned long uptime); | |
381 | static int proc_oom_score(struct task_struct *task, char *buffer) | |
382 | { | |
383 | unsigned long points; | |
384 | struct timespec uptime; | |
385 | ||
386 | do_posix_clock_monotonic_gettime(&uptime); | |
19c5d45a | 387 | read_lock(&tasklist_lock); |
1da177e4 | 388 | points = badness(task, uptime.tv_sec); |
19c5d45a | 389 | read_unlock(&tasklist_lock); |
1da177e4 LT |
390 | return sprintf(buffer, "%lu\n", points); |
391 | } | |
392 | ||
d85f50d5 NH |
393 | struct limit_names { |
394 | char *name; | |
395 | char *unit; | |
396 | }; | |
397 | ||
398 | static const struct limit_names lnames[RLIM_NLIMITS] = { | |
399 | [RLIMIT_CPU] = {"Max cpu time", "ms"}, | |
400 | [RLIMIT_FSIZE] = {"Max file size", "bytes"}, | |
401 | [RLIMIT_DATA] = {"Max data size", "bytes"}, | |
402 | [RLIMIT_STACK] = {"Max stack size", "bytes"}, | |
403 | [RLIMIT_CORE] = {"Max core file size", "bytes"}, | |
404 | [RLIMIT_RSS] = {"Max resident set", "bytes"}, | |
405 | [RLIMIT_NPROC] = {"Max processes", "processes"}, | |
406 | [RLIMIT_NOFILE] = {"Max open files", "files"}, | |
407 | [RLIMIT_MEMLOCK] = {"Max locked memory", "bytes"}, | |
408 | [RLIMIT_AS] = {"Max address space", "bytes"}, | |
409 | [RLIMIT_LOCKS] = {"Max file locks", "locks"}, | |
410 | [RLIMIT_SIGPENDING] = {"Max pending signals", "signals"}, | |
411 | [RLIMIT_MSGQUEUE] = {"Max msgqueue size", "bytes"}, | |
412 | [RLIMIT_NICE] = {"Max nice priority", NULL}, | |
413 | [RLIMIT_RTPRIO] = {"Max realtime priority", NULL}, | |
8808117c | 414 | [RLIMIT_RTTIME] = {"Max realtime timeout", "us"}, |
d85f50d5 NH |
415 | }; |
416 | ||
417 | /* Display limits for a process */ | |
418 | static int proc_pid_limits(struct task_struct *task, char *buffer) | |
419 | { | |
420 | unsigned int i; | |
421 | int count = 0; | |
422 | unsigned long flags; | |
423 | char *bufptr = buffer; | |
424 | ||
425 | struct rlimit rlim[RLIM_NLIMITS]; | |
426 | ||
427 | rcu_read_lock(); | |
428 | if (!lock_task_sighand(task,&flags)) { | |
429 | rcu_read_unlock(); | |
430 | return 0; | |
431 | } | |
432 | memcpy(rlim, task->signal->rlim, sizeof(struct rlimit) * RLIM_NLIMITS); | |
433 | unlock_task_sighand(task, &flags); | |
434 | rcu_read_unlock(); | |
435 | ||
436 | /* | |
437 | * print the file header | |
438 | */ | |
439 | count += sprintf(&bufptr[count], "%-25s %-20s %-20s %-10s\n", | |
440 | "Limit", "Soft Limit", "Hard Limit", "Units"); | |
441 | ||
442 | for (i = 0; i < RLIM_NLIMITS; i++) { | |
443 | if (rlim[i].rlim_cur == RLIM_INFINITY) | |
444 | count += sprintf(&bufptr[count], "%-25s %-20s ", | |
445 | lnames[i].name, "unlimited"); | |
446 | else | |
447 | count += sprintf(&bufptr[count], "%-25s %-20lu ", | |
448 | lnames[i].name, rlim[i].rlim_cur); | |
449 | ||
450 | if (rlim[i].rlim_max == RLIM_INFINITY) | |
451 | count += sprintf(&bufptr[count], "%-20s ", "unlimited"); | |
452 | else | |
453 | count += sprintf(&bufptr[count], "%-20lu ", | |
454 | rlim[i].rlim_max); | |
455 | ||
456 | if (lnames[i].unit) | |
457 | count += sprintf(&bufptr[count], "%-10s\n", | |
458 | lnames[i].unit); | |
459 | else | |
460 | count += sprintf(&bufptr[count], "\n"); | |
461 | } | |
462 | ||
463 | return count; | |
464 | } | |
465 | ||
1da177e4 LT |
466 | /************************************************************************/ |
467 | /* Here the fs part begins */ | |
468 | /************************************************************************/ | |
469 | ||
470 | /* permission checks */ | |
778c1144 | 471 | static int proc_fd_access_allowed(struct inode *inode) |
1da177e4 | 472 | { |
778c1144 EB |
473 | struct task_struct *task; |
474 | int allowed = 0; | |
df26c40e EB |
475 | /* Allow access to a task's file descriptors if it is us or we |
476 | * may use ptrace attach to the process and find out that | |
477 | * information. | |
778c1144 EB |
478 | */ |
479 | task = get_proc_task(inode); | |
df26c40e EB |
480 | if (task) { |
481 | allowed = ptrace_may_attach(task); | |
778c1144 | 482 | put_task_struct(task); |
df26c40e | 483 | } |
778c1144 | 484 | return allowed; |
1da177e4 LT |
485 | } |
486 | ||
6d76fa58 LT |
487 | static int proc_setattr(struct dentry *dentry, struct iattr *attr) |
488 | { | |
489 | int error; | |
490 | struct inode *inode = dentry->d_inode; | |
491 | ||
492 | if (attr->ia_valid & ATTR_MODE) | |
493 | return -EPERM; | |
494 | ||
495 | error = inode_change_ok(inode, attr); | |
1e8123fd JJ |
496 | if (!error) |
497 | error = inode_setattr(inode, attr); | |
6d76fa58 LT |
498 | return error; |
499 | } | |
500 | ||
c5ef1c42 | 501 | static const struct inode_operations proc_def_inode_operations = { |
6d76fa58 LT |
502 | .setattr = proc_setattr, |
503 | }; | |
504 | ||
a1a2c409 MS |
505 | static int mounts_open_common(struct inode *inode, struct file *file, |
506 | const struct seq_operations *op) | |
1da177e4 | 507 | { |
99f89551 | 508 | struct task_struct *task = get_proc_task(inode); |
cf7b708c | 509 | struct nsproxy *nsp; |
6b3286ed | 510 | struct mnt_namespace *ns = NULL; |
a1a2c409 MS |
511 | struct fs_struct *fs = NULL; |
512 | struct path root; | |
5addc5dd AV |
513 | struct proc_mounts *p; |
514 | int ret = -EINVAL; | |
1da177e4 | 515 | |
99f89551 | 516 | if (task) { |
cf7b708c PE |
517 | rcu_read_lock(); |
518 | nsp = task_nsproxy(task); | |
519 | if (nsp) { | |
520 | ns = nsp->mnt_ns; | |
863c4702 AD |
521 | if (ns) |
522 | get_mnt_ns(ns); | |
523 | } | |
cf7b708c | 524 | rcu_read_unlock(); |
a1a2c409 MS |
525 | if (ns) |
526 | fs = get_fs_struct(task); | |
99f89551 EB |
527 | put_task_struct(task); |
528 | } | |
5addc5dd | 529 | |
a1a2c409 MS |
530 | if (!ns) |
531 | goto err; | |
532 | if (!fs) | |
533 | goto err_put_ns; | |
534 | ||
535 | read_lock(&fs->lock); | |
536 | root = fs->root; | |
537 | path_get(&root); | |
538 | read_unlock(&fs->lock); | |
539 | put_fs_struct(fs); | |
540 | ||
541 | ret = -ENOMEM; | |
542 | p = kmalloc(sizeof(struct proc_mounts), GFP_KERNEL); | |
543 | if (!p) | |
544 | goto err_put_path; | |
545 | ||
546 | file->private_data = &p->m; | |
547 | ret = seq_open(file, op); | |
548 | if (ret) | |
549 | goto err_free; | |
550 | ||
551 | p->m.private = p; | |
552 | p->ns = ns; | |
553 | p->root = root; | |
554 | p->event = ns->event; | |
555 | ||
556 | return 0; | |
557 | ||
558 | err_free: | |
559 | kfree(p); | |
560 | err_put_path: | |
561 | path_put(&root); | |
562 | err_put_ns: | |
563 | put_mnt_ns(ns); | |
564 | err: | |
1da177e4 LT |
565 | return ret; |
566 | } | |
567 | ||
568 | static int mounts_release(struct inode *inode, struct file *file) | |
569 | { | |
a1a2c409 MS |
570 | struct proc_mounts *p = file->private_data; |
571 | path_put(&p->root); | |
572 | put_mnt_ns(p->ns); | |
1da177e4 LT |
573 | return seq_release(inode, file); |
574 | } | |
575 | ||
5addc5dd AV |
576 | static unsigned mounts_poll(struct file *file, poll_table *wait) |
577 | { | |
578 | struct proc_mounts *p = file->private_data; | |
a1a2c409 | 579 | struct mnt_namespace *ns = p->ns; |
5addc5dd AV |
580 | unsigned res = 0; |
581 | ||
582 | poll_wait(file, &ns->poll, wait); | |
583 | ||
584 | spin_lock(&vfsmount_lock); | |
585 | if (p->event != ns->event) { | |
586 | p->event = ns->event; | |
587 | res = POLLERR; | |
588 | } | |
589 | spin_unlock(&vfsmount_lock); | |
590 | ||
591 | return res; | |
592 | } | |
593 | ||
a1a2c409 MS |
594 | static int mounts_open(struct inode *inode, struct file *file) |
595 | { | |
596 | return mounts_open_common(inode, file, &mounts_op); | |
597 | } | |
598 | ||
00977a59 | 599 | static const struct file_operations proc_mounts_operations = { |
1da177e4 LT |
600 | .open = mounts_open, |
601 | .read = seq_read, | |
602 | .llseek = seq_lseek, | |
603 | .release = mounts_release, | |
5addc5dd | 604 | .poll = mounts_poll, |
1da177e4 LT |
605 | }; |
606 | ||
2d4d4864 RP |
607 | static int mountinfo_open(struct inode *inode, struct file *file) |
608 | { | |
609 | return mounts_open_common(inode, file, &mountinfo_op); | |
610 | } | |
611 | ||
612 | static const struct file_operations proc_mountinfo_operations = { | |
613 | .open = mountinfo_open, | |
614 | .read = seq_read, | |
615 | .llseek = seq_lseek, | |
616 | .release = mounts_release, | |
617 | .poll = mounts_poll, | |
618 | }; | |
619 | ||
b4629fe2 CL |
620 | static int mountstats_open(struct inode *inode, struct file *file) |
621 | { | |
a1a2c409 | 622 | return mounts_open_common(inode, file, &mountstats_op); |
b4629fe2 CL |
623 | } |
624 | ||
00977a59 | 625 | static const struct file_operations proc_mountstats_operations = { |
b4629fe2 CL |
626 | .open = mountstats_open, |
627 | .read = seq_read, | |
628 | .llseek = seq_lseek, | |
629 | .release = mounts_release, | |
630 | }; | |
631 | ||
1da177e4 LT |
632 | #define PROC_BLOCK_SIZE (3*1024) /* 4K page size but our output routines use some slack for overruns */ |
633 | ||
634 | static ssize_t proc_info_read(struct file * file, char __user * buf, | |
635 | size_t count, loff_t *ppos) | |
636 | { | |
2fddfeef | 637 | struct inode * inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
638 | unsigned long page; |
639 | ssize_t length; | |
99f89551 EB |
640 | struct task_struct *task = get_proc_task(inode); |
641 | ||
642 | length = -ESRCH; | |
643 | if (!task) | |
644 | goto out_no_task; | |
1da177e4 LT |
645 | |
646 | if (count > PROC_BLOCK_SIZE) | |
647 | count = PROC_BLOCK_SIZE; | |
99f89551 EB |
648 | |
649 | length = -ENOMEM; | |
e12ba74d | 650 | if (!(page = __get_free_page(GFP_TEMPORARY))) |
99f89551 | 651 | goto out; |
1da177e4 LT |
652 | |
653 | length = PROC_I(inode)->op.proc_read(task, (char*)page); | |
654 | ||
655 | if (length >= 0) | |
656 | length = simple_read_from_buffer(buf, count, ppos, (char *)page, length); | |
657 | free_page(page); | |
99f89551 EB |
658 | out: |
659 | put_task_struct(task); | |
660 | out_no_task: | |
1da177e4 LT |
661 | return length; |
662 | } | |
663 | ||
00977a59 | 664 | static const struct file_operations proc_info_file_operations = { |
1da177e4 LT |
665 | .read = proc_info_read, |
666 | }; | |
667 | ||
be614086 EB |
668 | static int proc_single_show(struct seq_file *m, void *v) |
669 | { | |
670 | struct inode *inode = m->private; | |
671 | struct pid_namespace *ns; | |
672 | struct pid *pid; | |
673 | struct task_struct *task; | |
674 | int ret; | |
675 | ||
676 | ns = inode->i_sb->s_fs_info; | |
677 | pid = proc_pid(inode); | |
678 | task = get_pid_task(pid, PIDTYPE_PID); | |
679 | if (!task) | |
680 | return -ESRCH; | |
681 | ||
682 | ret = PROC_I(inode)->op.proc_show(m, ns, pid, task); | |
683 | ||
684 | put_task_struct(task); | |
685 | return ret; | |
686 | } | |
687 | ||
688 | static int proc_single_open(struct inode *inode, struct file *filp) | |
689 | { | |
690 | int ret; | |
691 | ret = single_open(filp, proc_single_show, NULL); | |
692 | if (!ret) { | |
693 | struct seq_file *m = filp->private_data; | |
694 | ||
695 | m->private = inode; | |
696 | } | |
697 | return ret; | |
698 | } | |
699 | ||
700 | static const struct file_operations proc_single_file_operations = { | |
701 | .open = proc_single_open, | |
702 | .read = seq_read, | |
703 | .llseek = seq_lseek, | |
704 | .release = single_release, | |
705 | }; | |
706 | ||
1da177e4 LT |
707 | static int mem_open(struct inode* inode, struct file* file) |
708 | { | |
709 | file->private_data = (void*)((long)current->self_exec_id); | |
710 | return 0; | |
711 | } | |
712 | ||
713 | static ssize_t mem_read(struct file * file, char __user * buf, | |
714 | size_t count, loff_t *ppos) | |
715 | { | |
2fddfeef | 716 | struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode); |
1da177e4 LT |
717 | char *page; |
718 | unsigned long src = *ppos; | |
719 | int ret = -ESRCH; | |
720 | struct mm_struct *mm; | |
721 | ||
99f89551 EB |
722 | if (!task) |
723 | goto out_no_task; | |
724 | ||
ab8d11be | 725 | if (!MAY_PTRACE(task) || !ptrace_may_attach(task)) |
1da177e4 LT |
726 | goto out; |
727 | ||
728 | ret = -ENOMEM; | |
e12ba74d | 729 | page = (char *)__get_free_page(GFP_TEMPORARY); |
1da177e4 LT |
730 | if (!page) |
731 | goto out; | |
732 | ||
733 | ret = 0; | |
734 | ||
735 | mm = get_task_mm(task); | |
736 | if (!mm) | |
737 | goto out_free; | |
738 | ||
739 | ret = -EIO; | |
740 | ||
741 | if (file->private_data != (void*)((long)current->self_exec_id)) | |
742 | goto out_put; | |
743 | ||
744 | ret = 0; | |
745 | ||
746 | while (count > 0) { | |
747 | int this_len, retval; | |
748 | ||
749 | this_len = (count > PAGE_SIZE) ? PAGE_SIZE : count; | |
750 | retval = access_process_vm(task, src, page, this_len, 0); | |
ab8d11be | 751 | if (!retval || !MAY_PTRACE(task) || !ptrace_may_attach(task)) { |
1da177e4 LT |
752 | if (!ret) |
753 | ret = -EIO; | |
754 | break; | |
755 | } | |
756 | ||
757 | if (copy_to_user(buf, page, retval)) { | |
758 | ret = -EFAULT; | |
759 | break; | |
760 | } | |
761 | ||
762 | ret += retval; | |
763 | src += retval; | |
764 | buf += retval; | |
765 | count -= retval; | |
766 | } | |
767 | *ppos = src; | |
768 | ||
769 | out_put: | |
770 | mmput(mm); | |
771 | out_free: | |
772 | free_page((unsigned long) page); | |
773 | out: | |
99f89551 EB |
774 | put_task_struct(task); |
775 | out_no_task: | |
1da177e4 LT |
776 | return ret; |
777 | } | |
778 | ||
779 | #define mem_write NULL | |
780 | ||
781 | #ifndef mem_write | |
782 | /* This is a security hazard */ | |
63967fa9 | 783 | static ssize_t mem_write(struct file * file, const char __user *buf, |
1da177e4 LT |
784 | size_t count, loff_t *ppos) |
785 | { | |
f7ca54f4 | 786 | int copied; |
1da177e4 | 787 | char *page; |
2fddfeef | 788 | struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode); |
1da177e4 LT |
789 | unsigned long dst = *ppos; |
790 | ||
99f89551 EB |
791 | copied = -ESRCH; |
792 | if (!task) | |
793 | goto out_no_task; | |
794 | ||
ab8d11be | 795 | if (!MAY_PTRACE(task) || !ptrace_may_attach(task)) |
99f89551 | 796 | goto out; |
1da177e4 | 797 | |
99f89551 | 798 | copied = -ENOMEM; |
e12ba74d | 799 | page = (char *)__get_free_page(GFP_TEMPORARY); |
1da177e4 | 800 | if (!page) |
99f89551 | 801 | goto out; |
1da177e4 | 802 | |
f7ca54f4 | 803 | copied = 0; |
1da177e4 LT |
804 | while (count > 0) { |
805 | int this_len, retval; | |
806 | ||
807 | this_len = (count > PAGE_SIZE) ? PAGE_SIZE : count; | |
808 | if (copy_from_user(page, buf, this_len)) { | |
809 | copied = -EFAULT; | |
810 | break; | |
811 | } | |
812 | retval = access_process_vm(task, dst, page, this_len, 1); | |
813 | if (!retval) { | |
814 | if (!copied) | |
815 | copied = -EIO; | |
816 | break; | |
817 | } | |
818 | copied += retval; | |
819 | buf += retval; | |
820 | dst += retval; | |
821 | count -= retval; | |
822 | } | |
823 | *ppos = dst; | |
824 | free_page((unsigned long) page); | |
99f89551 EB |
825 | out: |
826 | put_task_struct(task); | |
827 | out_no_task: | |
1da177e4 LT |
828 | return copied; |
829 | } | |
830 | #endif | |
831 | ||
85863e47 | 832 | loff_t mem_lseek(struct file *file, loff_t offset, int orig) |
1da177e4 LT |
833 | { |
834 | switch (orig) { | |
835 | case 0: | |
836 | file->f_pos = offset; | |
837 | break; | |
838 | case 1: | |
839 | file->f_pos += offset; | |
840 | break; | |
841 | default: | |
842 | return -EINVAL; | |
843 | } | |
844 | force_successful_syscall_return(); | |
845 | return file->f_pos; | |
846 | } | |
847 | ||
00977a59 | 848 | static const struct file_operations proc_mem_operations = { |
1da177e4 LT |
849 | .llseek = mem_lseek, |
850 | .read = mem_read, | |
851 | .write = mem_write, | |
852 | .open = mem_open, | |
853 | }; | |
854 | ||
315e28c8 JP |
855 | static ssize_t environ_read(struct file *file, char __user *buf, |
856 | size_t count, loff_t *ppos) | |
857 | { | |
858 | struct task_struct *task = get_proc_task(file->f_dentry->d_inode); | |
859 | char *page; | |
860 | unsigned long src = *ppos; | |
861 | int ret = -ESRCH; | |
862 | struct mm_struct *mm; | |
863 | ||
864 | if (!task) | |
865 | goto out_no_task; | |
866 | ||
867 | if (!ptrace_may_attach(task)) | |
868 | goto out; | |
869 | ||
870 | ret = -ENOMEM; | |
871 | page = (char *)__get_free_page(GFP_TEMPORARY); | |
872 | if (!page) | |
873 | goto out; | |
874 | ||
875 | ret = 0; | |
876 | ||
877 | mm = get_task_mm(task); | |
878 | if (!mm) | |
879 | goto out_free; | |
880 | ||
881 | while (count > 0) { | |
882 | int this_len, retval, max_len; | |
883 | ||
884 | this_len = mm->env_end - (mm->env_start + src); | |
885 | ||
886 | if (this_len <= 0) | |
887 | break; | |
888 | ||
889 | max_len = (count > PAGE_SIZE) ? PAGE_SIZE : count; | |
890 | this_len = (this_len > max_len) ? max_len : this_len; | |
891 | ||
892 | retval = access_process_vm(task, (mm->env_start + src), | |
893 | page, this_len, 0); | |
894 | ||
895 | if (retval <= 0) { | |
896 | ret = retval; | |
897 | break; | |
898 | } | |
899 | ||
900 | if (copy_to_user(buf, page, retval)) { | |
901 | ret = -EFAULT; | |
902 | break; | |
903 | } | |
904 | ||
905 | ret += retval; | |
906 | src += retval; | |
907 | buf += retval; | |
908 | count -= retval; | |
909 | } | |
910 | *ppos = src; | |
911 | ||
912 | mmput(mm); | |
913 | out_free: | |
914 | free_page((unsigned long) page); | |
915 | out: | |
916 | put_task_struct(task); | |
917 | out_no_task: | |
918 | return ret; | |
919 | } | |
920 | ||
921 | static const struct file_operations proc_environ_operations = { | |
922 | .read = environ_read, | |
923 | }; | |
924 | ||
1da177e4 LT |
925 | static ssize_t oom_adjust_read(struct file *file, char __user *buf, |
926 | size_t count, loff_t *ppos) | |
927 | { | |
2fddfeef | 928 | struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode); |
8578cea7 | 929 | char buffer[PROC_NUMBUF]; |
1da177e4 | 930 | size_t len; |
99f89551 | 931 | int oom_adjust; |
1da177e4 | 932 | |
99f89551 EB |
933 | if (!task) |
934 | return -ESRCH; | |
935 | oom_adjust = task->oomkilladj; | |
936 | put_task_struct(task); | |
937 | ||
8578cea7 | 938 | len = snprintf(buffer, sizeof(buffer), "%i\n", oom_adjust); |
0c28f287 AM |
939 | |
940 | return simple_read_from_buffer(buf, count, ppos, buffer, len); | |
1da177e4 LT |
941 | } |
942 | ||
943 | static ssize_t oom_adjust_write(struct file *file, const char __user *buf, | |
944 | size_t count, loff_t *ppos) | |
945 | { | |
99f89551 | 946 | struct task_struct *task; |
8578cea7 | 947 | char buffer[PROC_NUMBUF], *end; |
1da177e4 LT |
948 | int oom_adjust; |
949 | ||
8578cea7 EB |
950 | memset(buffer, 0, sizeof(buffer)); |
951 | if (count > sizeof(buffer) - 1) | |
952 | count = sizeof(buffer) - 1; | |
1da177e4 LT |
953 | if (copy_from_user(buffer, buf, count)) |
954 | return -EFAULT; | |
955 | oom_adjust = simple_strtol(buffer, &end, 0); | |
8ac773b4 AD |
956 | if ((oom_adjust < OOM_ADJUST_MIN || oom_adjust > OOM_ADJUST_MAX) && |
957 | oom_adjust != OOM_DISABLE) | |
1da177e4 LT |
958 | return -EINVAL; |
959 | if (*end == '\n') | |
960 | end++; | |
2fddfeef | 961 | task = get_proc_task(file->f_path.dentry->d_inode); |
99f89551 EB |
962 | if (!task) |
963 | return -ESRCH; | |
8fb4fc68 GJ |
964 | if (oom_adjust < task->oomkilladj && !capable(CAP_SYS_RESOURCE)) { |
965 | put_task_struct(task); | |
966 | return -EACCES; | |
967 | } | |
1da177e4 | 968 | task->oomkilladj = oom_adjust; |
99f89551 | 969 | put_task_struct(task); |
1da177e4 LT |
970 | if (end - buffer == 0) |
971 | return -EIO; | |
972 | return end - buffer; | |
973 | } | |
974 | ||
00977a59 | 975 | static const struct file_operations proc_oom_adjust_operations = { |
1da177e4 LT |
976 | .read = oom_adjust_read, |
977 | .write = oom_adjust_write, | |
978 | }; | |
979 | ||
1da177e4 LT |
980 | #ifdef CONFIG_AUDITSYSCALL |
981 | #define TMPBUFLEN 21 | |
982 | static ssize_t proc_loginuid_read(struct file * file, char __user * buf, | |
983 | size_t count, loff_t *ppos) | |
984 | { | |
2fddfeef | 985 | struct inode * inode = file->f_path.dentry->d_inode; |
99f89551 | 986 | struct task_struct *task = get_proc_task(inode); |
1da177e4 LT |
987 | ssize_t length; |
988 | char tmpbuf[TMPBUFLEN]; | |
989 | ||
99f89551 EB |
990 | if (!task) |
991 | return -ESRCH; | |
1da177e4 | 992 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", |
0c11b942 | 993 | audit_get_loginuid(task)); |
99f89551 | 994 | put_task_struct(task); |
1da177e4 LT |
995 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); |
996 | } | |
997 | ||
998 | static ssize_t proc_loginuid_write(struct file * file, const char __user * buf, | |
999 | size_t count, loff_t *ppos) | |
1000 | { | |
2fddfeef | 1001 | struct inode * inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
1002 | char *page, *tmp; |
1003 | ssize_t length; | |
1da177e4 LT |
1004 | uid_t loginuid; |
1005 | ||
1006 | if (!capable(CAP_AUDIT_CONTROL)) | |
1007 | return -EPERM; | |
1008 | ||
13b41b09 | 1009 | if (current != pid_task(proc_pid(inode), PIDTYPE_PID)) |
1da177e4 LT |
1010 | return -EPERM; |
1011 | ||
e0182909 AV |
1012 | if (count >= PAGE_SIZE) |
1013 | count = PAGE_SIZE - 1; | |
1da177e4 LT |
1014 | |
1015 | if (*ppos != 0) { | |
1016 | /* No partial writes. */ | |
1017 | return -EINVAL; | |
1018 | } | |
e12ba74d | 1019 | page = (char*)__get_free_page(GFP_TEMPORARY); |
1da177e4 LT |
1020 | if (!page) |
1021 | return -ENOMEM; | |
1022 | length = -EFAULT; | |
1023 | if (copy_from_user(page, buf, count)) | |
1024 | goto out_free_page; | |
1025 | ||
e0182909 | 1026 | page[count] = '\0'; |
1da177e4 LT |
1027 | loginuid = simple_strtoul(page, &tmp, 10); |
1028 | if (tmp == page) { | |
1029 | length = -EINVAL; | |
1030 | goto out_free_page; | |
1031 | ||
1032 | } | |
99f89551 | 1033 | length = audit_set_loginuid(current, loginuid); |
1da177e4 LT |
1034 | if (likely(length == 0)) |
1035 | length = count; | |
1036 | ||
1037 | out_free_page: | |
1038 | free_page((unsigned long) page); | |
1039 | return length; | |
1040 | } | |
1041 | ||
00977a59 | 1042 | static const struct file_operations proc_loginuid_operations = { |
1da177e4 LT |
1043 | .read = proc_loginuid_read, |
1044 | .write = proc_loginuid_write, | |
1045 | }; | |
1e0bd755 EP |
1046 | |
1047 | static ssize_t proc_sessionid_read(struct file * file, char __user * buf, | |
1048 | size_t count, loff_t *ppos) | |
1049 | { | |
1050 | struct inode * inode = file->f_path.dentry->d_inode; | |
1051 | struct task_struct *task = get_proc_task(inode); | |
1052 | ssize_t length; | |
1053 | char tmpbuf[TMPBUFLEN]; | |
1054 | ||
1055 | if (!task) | |
1056 | return -ESRCH; | |
1057 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", | |
1058 | audit_get_sessionid(task)); | |
1059 | put_task_struct(task); | |
1060 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
1061 | } | |
1062 | ||
1063 | static const struct file_operations proc_sessionid_operations = { | |
1064 | .read = proc_sessionid_read, | |
1065 | }; | |
1da177e4 LT |
1066 | #endif |
1067 | ||
f4f154fd AM |
1068 | #ifdef CONFIG_FAULT_INJECTION |
1069 | static ssize_t proc_fault_inject_read(struct file * file, char __user * buf, | |
1070 | size_t count, loff_t *ppos) | |
1071 | { | |
1072 | struct task_struct *task = get_proc_task(file->f_dentry->d_inode); | |
1073 | char buffer[PROC_NUMBUF]; | |
1074 | size_t len; | |
1075 | int make_it_fail; | |
f4f154fd AM |
1076 | |
1077 | if (!task) | |
1078 | return -ESRCH; | |
1079 | make_it_fail = task->make_it_fail; | |
1080 | put_task_struct(task); | |
1081 | ||
1082 | len = snprintf(buffer, sizeof(buffer), "%i\n", make_it_fail); | |
0c28f287 AM |
1083 | |
1084 | return simple_read_from_buffer(buf, count, ppos, buffer, len); | |
f4f154fd AM |
1085 | } |
1086 | ||
1087 | static ssize_t proc_fault_inject_write(struct file * file, | |
1088 | const char __user * buf, size_t count, loff_t *ppos) | |
1089 | { | |
1090 | struct task_struct *task; | |
1091 | char buffer[PROC_NUMBUF], *end; | |
1092 | int make_it_fail; | |
1093 | ||
1094 | if (!capable(CAP_SYS_RESOURCE)) | |
1095 | return -EPERM; | |
1096 | memset(buffer, 0, sizeof(buffer)); | |
1097 | if (count > sizeof(buffer) - 1) | |
1098 | count = sizeof(buffer) - 1; | |
1099 | if (copy_from_user(buffer, buf, count)) | |
1100 | return -EFAULT; | |
1101 | make_it_fail = simple_strtol(buffer, &end, 0); | |
1102 | if (*end == '\n') | |
1103 | end++; | |
1104 | task = get_proc_task(file->f_dentry->d_inode); | |
1105 | if (!task) | |
1106 | return -ESRCH; | |
1107 | task->make_it_fail = make_it_fail; | |
1108 | put_task_struct(task); | |
1109 | if (end - buffer == 0) | |
1110 | return -EIO; | |
1111 | return end - buffer; | |
1112 | } | |
1113 | ||
00977a59 | 1114 | static const struct file_operations proc_fault_inject_operations = { |
f4f154fd AM |
1115 | .read = proc_fault_inject_read, |
1116 | .write = proc_fault_inject_write, | |
1117 | }; | |
1118 | #endif | |
1119 | ||
9745512c | 1120 | |
43ae34cb IM |
1121 | #ifdef CONFIG_SCHED_DEBUG |
1122 | /* | |
1123 | * Print out various scheduling related per-task fields: | |
1124 | */ | |
1125 | static int sched_show(struct seq_file *m, void *v) | |
1126 | { | |
1127 | struct inode *inode = m->private; | |
1128 | struct task_struct *p; | |
1129 | ||
1130 | WARN_ON(!inode); | |
1131 | ||
1132 | p = get_proc_task(inode); | |
1133 | if (!p) | |
1134 | return -ESRCH; | |
1135 | proc_sched_show_task(p, m); | |
1136 | ||
1137 | put_task_struct(p); | |
1138 | ||
1139 | return 0; | |
1140 | } | |
1141 | ||
1142 | static ssize_t | |
1143 | sched_write(struct file *file, const char __user *buf, | |
1144 | size_t count, loff_t *offset) | |
1145 | { | |
1146 | struct inode *inode = file->f_path.dentry->d_inode; | |
1147 | struct task_struct *p; | |
1148 | ||
1149 | WARN_ON(!inode); | |
1150 | ||
1151 | p = get_proc_task(inode); | |
1152 | if (!p) | |
1153 | return -ESRCH; | |
1154 | proc_sched_set_task(p); | |
1155 | ||
1156 | put_task_struct(p); | |
1157 | ||
1158 | return count; | |
1159 | } | |
1160 | ||
1161 | static int sched_open(struct inode *inode, struct file *filp) | |
1162 | { | |
1163 | int ret; | |
1164 | ||
1165 | ret = single_open(filp, sched_show, NULL); | |
1166 | if (!ret) { | |
1167 | struct seq_file *m = filp->private_data; | |
1168 | ||
1169 | m->private = inode; | |
1170 | } | |
1171 | return ret; | |
1172 | } | |
1173 | ||
1174 | static const struct file_operations proc_pid_sched_operations = { | |
1175 | .open = sched_open, | |
1176 | .read = seq_read, | |
1177 | .write = sched_write, | |
1178 | .llseek = seq_lseek, | |
5ea473a1 | 1179 | .release = single_release, |
43ae34cb IM |
1180 | }; |
1181 | ||
1182 | #endif | |
1183 | ||
008b150a | 1184 | static void *proc_pid_follow_link(struct dentry *dentry, struct nameidata *nd) |
1da177e4 LT |
1185 | { |
1186 | struct inode *inode = dentry->d_inode; | |
1187 | int error = -EACCES; | |
1188 | ||
1189 | /* We don't need a base pointer in the /proc filesystem */ | |
1d957f9b | 1190 | path_put(&nd->path); |
1da177e4 | 1191 | |
778c1144 EB |
1192 | /* Are we allowed to snoop on the tasks file descriptors? */ |
1193 | if (!proc_fd_access_allowed(inode)) | |
1da177e4 | 1194 | goto out; |
1da177e4 | 1195 | |
3dcd25f3 | 1196 | error = PROC_I(inode)->op.proc_get_link(inode, &nd->path); |
1da177e4 LT |
1197 | nd->last_type = LAST_BIND; |
1198 | out: | |
008b150a | 1199 | return ERR_PTR(error); |
1da177e4 LT |
1200 | } |
1201 | ||
3dcd25f3 | 1202 | static int do_proc_readlink(struct path *path, char __user *buffer, int buflen) |
1da177e4 | 1203 | { |
e12ba74d | 1204 | char *tmp = (char*)__get_free_page(GFP_TEMPORARY); |
3dcd25f3 | 1205 | char *pathname; |
1da177e4 LT |
1206 | int len; |
1207 | ||
1208 | if (!tmp) | |
1209 | return -ENOMEM; | |
0c28f287 | 1210 | |
cf28b486 | 1211 | pathname = d_path(path, tmp, PAGE_SIZE); |
3dcd25f3 JB |
1212 | len = PTR_ERR(pathname); |
1213 | if (IS_ERR(pathname)) | |
1da177e4 | 1214 | goto out; |
3dcd25f3 | 1215 | len = tmp + PAGE_SIZE - 1 - pathname; |
1da177e4 LT |
1216 | |
1217 | if (len > buflen) | |
1218 | len = buflen; | |
3dcd25f3 | 1219 | if (copy_to_user(buffer, pathname, len)) |
1da177e4 LT |
1220 | len = -EFAULT; |
1221 | out: | |
1222 | free_page((unsigned long)tmp); | |
1223 | return len; | |
1224 | } | |
1225 | ||
1226 | static int proc_pid_readlink(struct dentry * dentry, char __user * buffer, int buflen) | |
1227 | { | |
1228 | int error = -EACCES; | |
1229 | struct inode *inode = dentry->d_inode; | |
3dcd25f3 | 1230 | struct path path; |
1da177e4 | 1231 | |
778c1144 EB |
1232 | /* Are we allowed to snoop on the tasks file descriptors? */ |
1233 | if (!proc_fd_access_allowed(inode)) | |
1da177e4 | 1234 | goto out; |
1da177e4 | 1235 | |
3dcd25f3 | 1236 | error = PROC_I(inode)->op.proc_get_link(inode, &path); |
1da177e4 LT |
1237 | if (error) |
1238 | goto out; | |
1239 | ||
3dcd25f3 JB |
1240 | error = do_proc_readlink(&path, buffer, buflen); |
1241 | path_put(&path); | |
1da177e4 | 1242 | out: |
1da177e4 LT |
1243 | return error; |
1244 | } | |
1245 | ||
c5ef1c42 | 1246 | static const struct inode_operations proc_pid_link_inode_operations = { |
1da177e4 | 1247 | .readlink = proc_pid_readlink, |
6d76fa58 LT |
1248 | .follow_link = proc_pid_follow_link, |
1249 | .setattr = proc_setattr, | |
1da177e4 LT |
1250 | }; |
1251 | ||
28a6d671 EB |
1252 | |
1253 | /* building an inode */ | |
1254 | ||
1255 | static int task_dumpable(struct task_struct *task) | |
1da177e4 | 1256 | { |
28a6d671 EB |
1257 | int dumpable = 0; |
1258 | struct mm_struct *mm; | |
1da177e4 | 1259 | |
28a6d671 EB |
1260 | task_lock(task); |
1261 | mm = task->mm; | |
1262 | if (mm) | |
6c5d5238 | 1263 | dumpable = get_dumpable(mm); |
28a6d671 EB |
1264 | task_unlock(task); |
1265 | if(dumpable == 1) | |
1266 | return 1; | |
1267 | return 0; | |
1268 | } | |
1da177e4 | 1269 | |
1da177e4 | 1270 | |
61a28784 | 1271 | static struct inode *proc_pid_make_inode(struct super_block * sb, struct task_struct *task) |
28a6d671 EB |
1272 | { |
1273 | struct inode * inode; | |
1274 | struct proc_inode *ei; | |
1da177e4 | 1275 | |
28a6d671 | 1276 | /* We need a new inode */ |
1da177e4 | 1277 | |
28a6d671 EB |
1278 | inode = new_inode(sb); |
1279 | if (!inode) | |
1280 | goto out; | |
1281 | ||
1282 | /* Common stuff */ | |
1283 | ei = PROC_I(inode); | |
1284 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; | |
28a6d671 EB |
1285 | inode->i_op = &proc_def_inode_operations; |
1286 | ||
1287 | /* | |
1288 | * grab the reference to task. | |
1289 | */ | |
1a657f78 | 1290 | ei->pid = get_task_pid(task, PIDTYPE_PID); |
28a6d671 EB |
1291 | if (!ei->pid) |
1292 | goto out_unlock; | |
1293 | ||
1294 | inode->i_uid = 0; | |
1295 | inode->i_gid = 0; | |
1296 | if (task_dumpable(task)) { | |
1297 | inode->i_uid = task->euid; | |
1298 | inode->i_gid = task->egid; | |
1da177e4 | 1299 | } |
28a6d671 EB |
1300 | security_task_to_inode(task, inode); |
1301 | ||
1da177e4 | 1302 | out: |
28a6d671 EB |
1303 | return inode; |
1304 | ||
1305 | out_unlock: | |
1306 | iput(inode); | |
1307 | return NULL; | |
1da177e4 LT |
1308 | } |
1309 | ||
28a6d671 | 1310 | static int pid_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) |
1da177e4 | 1311 | { |
1da177e4 | 1312 | struct inode *inode = dentry->d_inode; |
28a6d671 EB |
1313 | struct task_struct *task; |
1314 | generic_fillattr(inode, stat); | |
1da177e4 | 1315 | |
28a6d671 EB |
1316 | rcu_read_lock(); |
1317 | stat->uid = 0; | |
1318 | stat->gid = 0; | |
1319 | task = pid_task(proc_pid(inode), PIDTYPE_PID); | |
1320 | if (task) { | |
1321 | if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) || | |
1322 | task_dumpable(task)) { | |
1323 | stat->uid = task->euid; | |
1324 | stat->gid = task->egid; | |
1da177e4 LT |
1325 | } |
1326 | } | |
28a6d671 | 1327 | rcu_read_unlock(); |
d6e71144 | 1328 | return 0; |
1da177e4 LT |
1329 | } |
1330 | ||
1da177e4 LT |
1331 | /* dentry stuff */ |
1332 | ||
1333 | /* | |
1334 | * Exceptional case: normally we are not allowed to unhash a busy | |
1335 | * directory. In this case, however, we can do it - no aliasing problems | |
1336 | * due to the way we treat inodes. | |
1337 | * | |
1338 | * Rewrite the inode's ownerships here because the owning task may have | |
1339 | * performed a setuid(), etc. | |
99f89551 EB |
1340 | * |
1341 | * Before the /proc/pid/status file was created the only way to read | |
1342 | * the effective uid of a /process was to stat /proc/pid. Reading | |
1343 | * /proc/pid/status is slow enough that procps and other packages | |
1344 | * kept stating /proc/pid. To keep the rules in /proc simple I have | |
1345 | * made this apply to all per process world readable and executable | |
1346 | * directories. | |
1da177e4 LT |
1347 | */ |
1348 | static int pid_revalidate(struct dentry *dentry, struct nameidata *nd) | |
1349 | { | |
1350 | struct inode *inode = dentry->d_inode; | |
99f89551 EB |
1351 | struct task_struct *task = get_proc_task(inode); |
1352 | if (task) { | |
1353 | if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) || | |
1354 | task_dumpable(task)) { | |
1da177e4 LT |
1355 | inode->i_uid = task->euid; |
1356 | inode->i_gid = task->egid; | |
1357 | } else { | |
1358 | inode->i_uid = 0; | |
1359 | inode->i_gid = 0; | |
1360 | } | |
9ee8ab9f | 1361 | inode->i_mode &= ~(S_ISUID | S_ISGID); |
1da177e4 | 1362 | security_task_to_inode(task, inode); |
99f89551 | 1363 | put_task_struct(task); |
1da177e4 LT |
1364 | return 1; |
1365 | } | |
1366 | d_drop(dentry); | |
1367 | return 0; | |
1368 | } | |
1369 | ||
28a6d671 | 1370 | static int pid_delete_dentry(struct dentry * dentry) |
99f89551 | 1371 | { |
28a6d671 EB |
1372 | /* Is the task we represent dead? |
1373 | * If so, then don't put the dentry on the lru list, | |
1374 | * kill it immediately. | |
1375 | */ | |
1376 | return !proc_pid(dentry->d_inode)->tasks[PIDTYPE_PID].first; | |
1377 | } | |
1378 | ||
1379 | static struct dentry_operations pid_dentry_operations = | |
1380 | { | |
1381 | .d_revalidate = pid_revalidate, | |
1382 | .d_delete = pid_delete_dentry, | |
1383 | }; | |
1384 | ||
1385 | /* Lookups */ | |
1386 | ||
c5141e6d ED |
1387 | typedef struct dentry *instantiate_t(struct inode *, struct dentry *, |
1388 | struct task_struct *, const void *); | |
61a28784 | 1389 | |
1c0d04c9 EB |
1390 | /* |
1391 | * Fill a directory entry. | |
1392 | * | |
1393 | * If possible create the dcache entry and derive our inode number and | |
1394 | * file type from dcache entry. | |
1395 | * | |
1396 | * Since all of the proc inode numbers are dynamically generated, the inode | |
1397 | * numbers do not exist until the inode is cache. This means creating the | |
1398 | * the dcache entry in readdir is necessary to keep the inode numbers | |
1399 | * reported by readdir in sync with the inode numbers reported | |
1400 | * by stat. | |
1401 | */ | |
61a28784 EB |
1402 | static int proc_fill_cache(struct file *filp, void *dirent, filldir_t filldir, |
1403 | char *name, int len, | |
c5141e6d | 1404 | instantiate_t instantiate, struct task_struct *task, const void *ptr) |
61a28784 | 1405 | { |
2fddfeef | 1406 | struct dentry *child, *dir = filp->f_path.dentry; |
61a28784 EB |
1407 | struct inode *inode; |
1408 | struct qstr qname; | |
1409 | ino_t ino = 0; | |
1410 | unsigned type = DT_UNKNOWN; | |
1411 | ||
1412 | qname.name = name; | |
1413 | qname.len = len; | |
1414 | qname.hash = full_name_hash(name, len); | |
1415 | ||
1416 | child = d_lookup(dir, &qname); | |
1417 | if (!child) { | |
1418 | struct dentry *new; | |
1419 | new = d_alloc(dir, &qname); | |
1420 | if (new) { | |
1421 | child = instantiate(dir->d_inode, new, task, ptr); | |
1422 | if (child) | |
1423 | dput(new); | |
1424 | else | |
1425 | child = new; | |
1426 | } | |
1427 | } | |
1428 | if (!child || IS_ERR(child) || !child->d_inode) | |
1429 | goto end_instantiate; | |
1430 | inode = child->d_inode; | |
1431 | if (inode) { | |
1432 | ino = inode->i_ino; | |
1433 | type = inode->i_mode >> 12; | |
1434 | } | |
1435 | dput(child); | |
1436 | end_instantiate: | |
1437 | if (!ino) | |
1438 | ino = find_inode_number(dir, &qname); | |
1439 | if (!ino) | |
1440 | ino = 1; | |
1441 | return filldir(dirent, name, len, filp->f_pos, ino, type); | |
1442 | } | |
1443 | ||
28a6d671 EB |
1444 | static unsigned name_to_int(struct dentry *dentry) |
1445 | { | |
1446 | const char *name = dentry->d_name.name; | |
1447 | int len = dentry->d_name.len; | |
1448 | unsigned n = 0; | |
1449 | ||
1450 | if (len > 1 && *name == '0') | |
1451 | goto out; | |
1452 | while (len-- > 0) { | |
1453 | unsigned c = *name++ - '0'; | |
1454 | if (c > 9) | |
1455 | goto out; | |
1456 | if (n >= (~0U-9)/10) | |
1457 | goto out; | |
1458 | n *= 10; | |
1459 | n += c; | |
1460 | } | |
1461 | return n; | |
1462 | out: | |
1463 | return ~0U; | |
1464 | } | |
1465 | ||
27932742 MS |
1466 | #define PROC_FDINFO_MAX 64 |
1467 | ||
3dcd25f3 | 1468 | static int proc_fd_info(struct inode *inode, struct path *path, char *info) |
28a6d671 EB |
1469 | { |
1470 | struct task_struct *task = get_proc_task(inode); | |
1471 | struct files_struct *files = NULL; | |
1472 | struct file *file; | |
1473 | int fd = proc_fd(inode); | |
99f89551 | 1474 | |
99f89551 | 1475 | if (task) { |
28a6d671 EB |
1476 | files = get_files_struct(task); |
1477 | put_task_struct(task); | |
1478 | } | |
1479 | if (files) { | |
1480 | /* | |
1481 | * We are not taking a ref to the file structure, so we must | |
1482 | * hold ->file_lock. | |
1483 | */ | |
1484 | spin_lock(&files->file_lock); | |
1485 | file = fcheck_files(files, fd); | |
1486 | if (file) { | |
3dcd25f3 JB |
1487 | if (path) { |
1488 | *path = file->f_path; | |
1489 | path_get(&file->f_path); | |
1490 | } | |
27932742 MS |
1491 | if (info) |
1492 | snprintf(info, PROC_FDINFO_MAX, | |
1493 | "pos:\t%lli\n" | |
1494 | "flags:\t0%o\n", | |
1495 | (long long) file->f_pos, | |
1496 | file->f_flags); | |
28a6d671 EB |
1497 | spin_unlock(&files->file_lock); |
1498 | put_files_struct(files); | |
1499 | return 0; | |
99f89551 | 1500 | } |
28a6d671 EB |
1501 | spin_unlock(&files->file_lock); |
1502 | put_files_struct(files); | |
99f89551 | 1503 | } |
28a6d671 | 1504 | return -ENOENT; |
99f89551 EB |
1505 | } |
1506 | ||
3dcd25f3 | 1507 | static int proc_fd_link(struct inode *inode, struct path *path) |
27932742 | 1508 | { |
3dcd25f3 | 1509 | return proc_fd_info(inode, path, NULL); |
27932742 MS |
1510 | } |
1511 | ||
1da177e4 LT |
1512 | static int tid_fd_revalidate(struct dentry *dentry, struct nameidata *nd) |
1513 | { | |
1514 | struct inode *inode = dentry->d_inode; | |
99f89551 | 1515 | struct task_struct *task = get_proc_task(inode); |
aed7a6c4 | 1516 | int fd = proc_fd(inode); |
1da177e4 LT |
1517 | struct files_struct *files; |
1518 | ||
99f89551 EB |
1519 | if (task) { |
1520 | files = get_files_struct(task); | |
1521 | if (files) { | |
1522 | rcu_read_lock(); | |
1523 | if (fcheck_files(files, fd)) { | |
1524 | rcu_read_unlock(); | |
1525 | put_files_struct(files); | |
1526 | if (task_dumpable(task)) { | |
1527 | inode->i_uid = task->euid; | |
1528 | inode->i_gid = task->egid; | |
1529 | } else { | |
1530 | inode->i_uid = 0; | |
1531 | inode->i_gid = 0; | |
1532 | } | |
9ee8ab9f | 1533 | inode->i_mode &= ~(S_ISUID | S_ISGID); |
99f89551 EB |
1534 | security_task_to_inode(task, inode); |
1535 | put_task_struct(task); | |
1536 | return 1; | |
1537 | } | |
b835996f | 1538 | rcu_read_unlock(); |
1da177e4 | 1539 | put_files_struct(files); |
1da177e4 | 1540 | } |
99f89551 | 1541 | put_task_struct(task); |
1da177e4 LT |
1542 | } |
1543 | d_drop(dentry); | |
1544 | return 0; | |
1545 | } | |
1546 | ||
1da177e4 LT |
1547 | static struct dentry_operations tid_fd_dentry_operations = |
1548 | { | |
1549 | .d_revalidate = tid_fd_revalidate, | |
1550 | .d_delete = pid_delete_dentry, | |
1551 | }; | |
1552 | ||
444ceed8 | 1553 | static struct dentry *proc_fd_instantiate(struct inode *dir, |
c5141e6d | 1554 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
1da177e4 | 1555 | { |
c5141e6d | 1556 | unsigned fd = *(const unsigned *)ptr; |
444ceed8 EB |
1557 | struct file *file; |
1558 | struct files_struct *files; | |
1559 | struct inode *inode; | |
1560 | struct proc_inode *ei; | |
1561 | struct dentry *error = ERR_PTR(-ENOENT); | |
1da177e4 | 1562 | |
61a28784 | 1563 | inode = proc_pid_make_inode(dir->i_sb, task); |
1da177e4 LT |
1564 | if (!inode) |
1565 | goto out; | |
1566 | ei = PROC_I(inode); | |
aed7a6c4 | 1567 | ei->fd = fd; |
1da177e4 LT |
1568 | files = get_files_struct(task); |
1569 | if (!files) | |
444ceed8 | 1570 | goto out_iput; |
1da177e4 | 1571 | inode->i_mode = S_IFLNK; |
ca99c1da DS |
1572 | |
1573 | /* | |
1574 | * We are not taking a ref to the file structure, so we must | |
1575 | * hold ->file_lock. | |
1576 | */ | |
1577 | spin_lock(&files->file_lock); | |
1da177e4 LT |
1578 | file = fcheck_files(files, fd); |
1579 | if (!file) | |
444ceed8 | 1580 | goto out_unlock; |
1da177e4 LT |
1581 | if (file->f_mode & 1) |
1582 | inode->i_mode |= S_IRUSR | S_IXUSR; | |
1583 | if (file->f_mode & 2) | |
1584 | inode->i_mode |= S_IWUSR | S_IXUSR; | |
ca99c1da | 1585 | spin_unlock(&files->file_lock); |
1da177e4 | 1586 | put_files_struct(files); |
444ceed8 | 1587 | |
1da177e4 LT |
1588 | inode->i_op = &proc_pid_link_inode_operations; |
1589 | inode->i_size = 64; | |
1590 | ei->op.proc_get_link = proc_fd_link; | |
1591 | dentry->d_op = &tid_fd_dentry_operations; | |
1592 | d_add(dentry, inode); | |
cd6a3ce9 EB |
1593 | /* Close the race of the process dying before we return the dentry */ |
1594 | if (tid_fd_revalidate(dentry, NULL)) | |
444ceed8 | 1595 | error = NULL; |
1da177e4 | 1596 | |
444ceed8 EB |
1597 | out: |
1598 | return error; | |
1599 | out_unlock: | |
ca99c1da | 1600 | spin_unlock(&files->file_lock); |
1da177e4 | 1601 | put_files_struct(files); |
444ceed8 | 1602 | out_iput: |
1da177e4 | 1603 | iput(inode); |
cd6a3ce9 | 1604 | goto out; |
1da177e4 LT |
1605 | } |
1606 | ||
27932742 MS |
1607 | static struct dentry *proc_lookupfd_common(struct inode *dir, |
1608 | struct dentry *dentry, | |
1609 | instantiate_t instantiate) | |
444ceed8 EB |
1610 | { |
1611 | struct task_struct *task = get_proc_task(dir); | |
1612 | unsigned fd = name_to_int(dentry); | |
1613 | struct dentry *result = ERR_PTR(-ENOENT); | |
1614 | ||
1615 | if (!task) | |
1616 | goto out_no_task; | |
1617 | if (fd == ~0U) | |
1618 | goto out; | |
1619 | ||
27932742 | 1620 | result = instantiate(dir, dentry, task, &fd); |
444ceed8 EB |
1621 | out: |
1622 | put_task_struct(task); | |
1623 | out_no_task: | |
1624 | return result; | |
1625 | } | |
1626 | ||
27932742 MS |
1627 | static int proc_readfd_common(struct file * filp, void * dirent, |
1628 | filldir_t filldir, instantiate_t instantiate) | |
28a6d671 | 1629 | { |
2fddfeef | 1630 | struct dentry *dentry = filp->f_path.dentry; |
28a6d671 EB |
1631 | struct inode *inode = dentry->d_inode; |
1632 | struct task_struct *p = get_proc_task(inode); | |
457c2510 | 1633 | unsigned int fd, ino; |
28a6d671 | 1634 | int retval; |
28a6d671 | 1635 | struct files_struct * files; |
1da177e4 | 1636 | |
28a6d671 EB |
1637 | retval = -ENOENT; |
1638 | if (!p) | |
1639 | goto out_no_task; | |
1640 | retval = 0; | |
28a6d671 EB |
1641 | |
1642 | fd = filp->f_pos; | |
1643 | switch (fd) { | |
1644 | case 0: | |
1645 | if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0) | |
1646 | goto out; | |
1647 | filp->f_pos++; | |
1648 | case 1: | |
1649 | ino = parent_ino(dentry); | |
1650 | if (filldir(dirent, "..", 2, 1, ino, DT_DIR) < 0) | |
1651 | goto out; | |
1652 | filp->f_pos++; | |
1653 | default: | |
1654 | files = get_files_struct(p); | |
1655 | if (!files) | |
1656 | goto out; | |
1657 | rcu_read_lock(); | |
28a6d671 | 1658 | for (fd = filp->f_pos-2; |
9b4f526c | 1659 | fd < files_fdtable(files)->max_fds; |
28a6d671 | 1660 | fd++, filp->f_pos++) { |
27932742 MS |
1661 | char name[PROC_NUMBUF]; |
1662 | int len; | |
28a6d671 EB |
1663 | |
1664 | if (!fcheck_files(files, fd)) | |
1665 | continue; | |
1666 | rcu_read_unlock(); | |
1667 | ||
27932742 MS |
1668 | len = snprintf(name, sizeof(name), "%d", fd); |
1669 | if (proc_fill_cache(filp, dirent, filldir, | |
1670 | name, len, instantiate, | |
1671 | p, &fd) < 0) { | |
28a6d671 EB |
1672 | rcu_read_lock(); |
1673 | break; | |
1674 | } | |
1675 | rcu_read_lock(); | |
1676 | } | |
1677 | rcu_read_unlock(); | |
1678 | put_files_struct(files); | |
1679 | } | |
1680 | out: | |
1681 | put_task_struct(p); | |
1682 | out_no_task: | |
1683 | return retval; | |
1684 | } | |
1685 | ||
27932742 MS |
1686 | static struct dentry *proc_lookupfd(struct inode *dir, struct dentry *dentry, |
1687 | struct nameidata *nd) | |
1688 | { | |
1689 | return proc_lookupfd_common(dir, dentry, proc_fd_instantiate); | |
1690 | } | |
1691 | ||
1692 | static int proc_readfd(struct file *filp, void *dirent, filldir_t filldir) | |
1693 | { | |
1694 | return proc_readfd_common(filp, dirent, filldir, proc_fd_instantiate); | |
1695 | } | |
1696 | ||
1697 | static ssize_t proc_fdinfo_read(struct file *file, char __user *buf, | |
1698 | size_t len, loff_t *ppos) | |
1699 | { | |
1700 | char tmp[PROC_FDINFO_MAX]; | |
3dcd25f3 | 1701 | int err = proc_fd_info(file->f_path.dentry->d_inode, NULL, tmp); |
27932742 MS |
1702 | if (!err) |
1703 | err = simple_read_from_buffer(buf, len, ppos, tmp, strlen(tmp)); | |
1704 | return err; | |
1705 | } | |
1706 | ||
1707 | static const struct file_operations proc_fdinfo_file_operations = { | |
1708 | .open = nonseekable_open, | |
1709 | .read = proc_fdinfo_read, | |
1710 | }; | |
1711 | ||
00977a59 | 1712 | static const struct file_operations proc_fd_operations = { |
28a6d671 EB |
1713 | .read = generic_read_dir, |
1714 | .readdir = proc_readfd, | |
1da177e4 LT |
1715 | }; |
1716 | ||
8948e11f AD |
1717 | /* |
1718 | * /proc/pid/fd needs a special permission handler so that a process can still | |
1719 | * access /proc/self/fd after it has executed a setuid(). | |
1720 | */ | |
1721 | static int proc_fd_permission(struct inode *inode, int mask, | |
1722 | struct nameidata *nd) | |
1723 | { | |
1724 | int rv; | |
1725 | ||
1726 | rv = generic_permission(inode, mask, NULL); | |
1727 | if (rv == 0) | |
1728 | return 0; | |
1729 | if (task_pid(current) == proc_pid(inode)) | |
1730 | rv = 0; | |
1731 | return rv; | |
1732 | } | |
1733 | ||
1da177e4 LT |
1734 | /* |
1735 | * proc directories can do almost nothing.. | |
1736 | */ | |
c5ef1c42 | 1737 | static const struct inode_operations proc_fd_inode_operations = { |
1da177e4 | 1738 | .lookup = proc_lookupfd, |
8948e11f | 1739 | .permission = proc_fd_permission, |
6d76fa58 | 1740 | .setattr = proc_setattr, |
1da177e4 LT |
1741 | }; |
1742 | ||
27932742 MS |
1743 | static struct dentry *proc_fdinfo_instantiate(struct inode *dir, |
1744 | struct dentry *dentry, struct task_struct *task, const void *ptr) | |
1745 | { | |
1746 | unsigned fd = *(unsigned *)ptr; | |
1747 | struct inode *inode; | |
1748 | struct proc_inode *ei; | |
1749 | struct dentry *error = ERR_PTR(-ENOENT); | |
1750 | ||
1751 | inode = proc_pid_make_inode(dir->i_sb, task); | |
1752 | if (!inode) | |
1753 | goto out; | |
1754 | ei = PROC_I(inode); | |
1755 | ei->fd = fd; | |
1756 | inode->i_mode = S_IFREG | S_IRUSR; | |
1757 | inode->i_fop = &proc_fdinfo_file_operations; | |
1758 | dentry->d_op = &tid_fd_dentry_operations; | |
1759 | d_add(dentry, inode); | |
1760 | /* Close the race of the process dying before we return the dentry */ | |
1761 | if (tid_fd_revalidate(dentry, NULL)) | |
1762 | error = NULL; | |
1763 | ||
1764 | out: | |
1765 | return error; | |
1766 | } | |
1767 | ||
1768 | static struct dentry *proc_lookupfdinfo(struct inode *dir, | |
1769 | struct dentry *dentry, | |
1770 | struct nameidata *nd) | |
1771 | { | |
1772 | return proc_lookupfd_common(dir, dentry, proc_fdinfo_instantiate); | |
1773 | } | |
1774 | ||
1775 | static int proc_readfdinfo(struct file *filp, void *dirent, filldir_t filldir) | |
1776 | { | |
1777 | return proc_readfd_common(filp, dirent, filldir, | |
1778 | proc_fdinfo_instantiate); | |
1779 | } | |
1780 | ||
1781 | static const struct file_operations proc_fdinfo_operations = { | |
1782 | .read = generic_read_dir, | |
1783 | .readdir = proc_readfdinfo, | |
1784 | }; | |
1785 | ||
1786 | /* | |
1787 | * proc directories can do almost nothing.. | |
1788 | */ | |
1789 | static const struct inode_operations proc_fdinfo_inode_operations = { | |
1790 | .lookup = proc_lookupfdinfo, | |
1791 | .setattr = proc_setattr, | |
1792 | }; | |
1793 | ||
1794 | ||
444ceed8 | 1795 | static struct dentry *proc_pident_instantiate(struct inode *dir, |
c5141e6d | 1796 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
444ceed8 | 1797 | { |
c5141e6d | 1798 | const struct pid_entry *p = ptr; |
444ceed8 EB |
1799 | struct inode *inode; |
1800 | struct proc_inode *ei; | |
1801 | struct dentry *error = ERR_PTR(-EINVAL); | |
1802 | ||
61a28784 | 1803 | inode = proc_pid_make_inode(dir->i_sb, task); |
444ceed8 EB |
1804 | if (!inode) |
1805 | goto out; | |
1806 | ||
1807 | ei = PROC_I(inode); | |
1808 | inode->i_mode = p->mode; | |
1809 | if (S_ISDIR(inode->i_mode)) | |
1810 | inode->i_nlink = 2; /* Use getattr to fix if necessary */ | |
1811 | if (p->iop) | |
1812 | inode->i_op = p->iop; | |
1813 | if (p->fop) | |
1814 | inode->i_fop = p->fop; | |
1815 | ei->op = p->op; | |
1816 | dentry->d_op = &pid_dentry_operations; | |
1817 | d_add(dentry, inode); | |
1818 | /* Close the race of the process dying before we return the dentry */ | |
1819 | if (pid_revalidate(dentry, NULL)) | |
1820 | error = NULL; | |
1821 | out: | |
1822 | return error; | |
1823 | } | |
1824 | ||
1da177e4 LT |
1825 | static struct dentry *proc_pident_lookup(struct inode *dir, |
1826 | struct dentry *dentry, | |
c5141e6d | 1827 | const struct pid_entry *ents, |
7bcd6b0e | 1828 | unsigned int nents) |
1da177e4 LT |
1829 | { |
1830 | struct inode *inode; | |
cd6a3ce9 | 1831 | struct dentry *error; |
99f89551 | 1832 | struct task_struct *task = get_proc_task(dir); |
c5141e6d | 1833 | const struct pid_entry *p, *last; |
1da177e4 | 1834 | |
cd6a3ce9 | 1835 | error = ERR_PTR(-ENOENT); |
1da177e4 LT |
1836 | inode = NULL; |
1837 | ||
99f89551 EB |
1838 | if (!task) |
1839 | goto out_no_task; | |
1da177e4 | 1840 | |
20cdc894 EB |
1841 | /* |
1842 | * Yes, it does not scale. And it should not. Don't add | |
1843 | * new entries into /proc/<tgid>/ without very good reasons. | |
1844 | */ | |
7bcd6b0e EB |
1845 | last = &ents[nents - 1]; |
1846 | for (p = ents; p <= last; p++) { | |
1da177e4 LT |
1847 | if (p->len != dentry->d_name.len) |
1848 | continue; | |
1849 | if (!memcmp(dentry->d_name.name, p->name, p->len)) | |
1850 | break; | |
1851 | } | |
7bcd6b0e | 1852 | if (p > last) |
1da177e4 LT |
1853 | goto out; |
1854 | ||
444ceed8 | 1855 | error = proc_pident_instantiate(dir, dentry, task, p); |
1da177e4 | 1856 | out: |
99f89551 EB |
1857 | put_task_struct(task); |
1858 | out_no_task: | |
cd6a3ce9 | 1859 | return error; |
1da177e4 LT |
1860 | } |
1861 | ||
c5141e6d ED |
1862 | static int proc_pident_fill_cache(struct file *filp, void *dirent, |
1863 | filldir_t filldir, struct task_struct *task, const struct pid_entry *p) | |
61a28784 EB |
1864 | { |
1865 | return proc_fill_cache(filp, dirent, filldir, p->name, p->len, | |
1866 | proc_pident_instantiate, task, p); | |
1867 | } | |
1868 | ||
28a6d671 EB |
1869 | static int proc_pident_readdir(struct file *filp, |
1870 | void *dirent, filldir_t filldir, | |
c5141e6d | 1871 | const struct pid_entry *ents, unsigned int nents) |
28a6d671 EB |
1872 | { |
1873 | int i; | |
2fddfeef | 1874 | struct dentry *dentry = filp->f_path.dentry; |
28a6d671 EB |
1875 | struct inode *inode = dentry->d_inode; |
1876 | struct task_struct *task = get_proc_task(inode); | |
c5141e6d | 1877 | const struct pid_entry *p, *last; |
28a6d671 EB |
1878 | ino_t ino; |
1879 | int ret; | |
1880 | ||
1881 | ret = -ENOENT; | |
1882 | if (!task) | |
61a28784 | 1883 | goto out_no_task; |
28a6d671 EB |
1884 | |
1885 | ret = 0; | |
28a6d671 EB |
1886 | i = filp->f_pos; |
1887 | switch (i) { | |
1888 | case 0: | |
1889 | ino = inode->i_ino; | |
1890 | if (filldir(dirent, ".", 1, i, ino, DT_DIR) < 0) | |
1891 | goto out; | |
1892 | i++; | |
1893 | filp->f_pos++; | |
1894 | /* fall through */ | |
1895 | case 1: | |
1896 | ino = parent_ino(dentry); | |
1897 | if (filldir(dirent, "..", 2, i, ino, DT_DIR) < 0) | |
1898 | goto out; | |
1899 | i++; | |
1900 | filp->f_pos++; | |
1901 | /* fall through */ | |
1902 | default: | |
1903 | i -= 2; | |
1904 | if (i >= nents) { | |
1905 | ret = 1; | |
1906 | goto out; | |
1907 | } | |
1908 | p = ents + i; | |
7bcd6b0e EB |
1909 | last = &ents[nents - 1]; |
1910 | while (p <= last) { | |
61a28784 | 1911 | if (proc_pident_fill_cache(filp, dirent, filldir, task, p) < 0) |
28a6d671 EB |
1912 | goto out; |
1913 | filp->f_pos++; | |
1914 | p++; | |
1915 | } | |
1916 | } | |
1917 | ||
1918 | ret = 1; | |
1919 | out: | |
61a28784 EB |
1920 | put_task_struct(task); |
1921 | out_no_task: | |
28a6d671 | 1922 | return ret; |
1da177e4 LT |
1923 | } |
1924 | ||
28a6d671 EB |
1925 | #ifdef CONFIG_SECURITY |
1926 | static ssize_t proc_pid_attr_read(struct file * file, char __user * buf, | |
1927 | size_t count, loff_t *ppos) | |
1928 | { | |
2fddfeef | 1929 | struct inode * inode = file->f_path.dentry->d_inode; |
04ff9708 | 1930 | char *p = NULL; |
28a6d671 EB |
1931 | ssize_t length; |
1932 | struct task_struct *task = get_proc_task(inode); | |
1933 | ||
28a6d671 | 1934 | if (!task) |
04ff9708 | 1935 | return -ESRCH; |
28a6d671 EB |
1936 | |
1937 | length = security_getprocattr(task, | |
2fddfeef | 1938 | (char*)file->f_path.dentry->d_name.name, |
04ff9708 | 1939 | &p); |
28a6d671 | 1940 | put_task_struct(task); |
04ff9708 AV |
1941 | if (length > 0) |
1942 | length = simple_read_from_buffer(buf, count, ppos, p, length); | |
1943 | kfree(p); | |
28a6d671 | 1944 | return length; |
1da177e4 LT |
1945 | } |
1946 | ||
28a6d671 EB |
1947 | static ssize_t proc_pid_attr_write(struct file * file, const char __user * buf, |
1948 | size_t count, loff_t *ppos) | |
1949 | { | |
2fddfeef | 1950 | struct inode * inode = file->f_path.dentry->d_inode; |
28a6d671 EB |
1951 | char *page; |
1952 | ssize_t length; | |
1953 | struct task_struct *task = get_proc_task(inode); | |
1954 | ||
1955 | length = -ESRCH; | |
1956 | if (!task) | |
1957 | goto out_no_task; | |
1958 | if (count > PAGE_SIZE) | |
1959 | count = PAGE_SIZE; | |
1960 | ||
1961 | /* No partial writes. */ | |
1962 | length = -EINVAL; | |
1963 | if (*ppos != 0) | |
1964 | goto out; | |
1965 | ||
1966 | length = -ENOMEM; | |
e12ba74d | 1967 | page = (char*)__get_free_page(GFP_TEMPORARY); |
28a6d671 EB |
1968 | if (!page) |
1969 | goto out; | |
1970 | ||
1971 | length = -EFAULT; | |
1972 | if (copy_from_user(page, buf, count)) | |
1973 | goto out_free; | |
1974 | ||
1975 | length = security_setprocattr(task, | |
2fddfeef | 1976 | (char*)file->f_path.dentry->d_name.name, |
28a6d671 EB |
1977 | (void*)page, count); |
1978 | out_free: | |
1979 | free_page((unsigned long) page); | |
1980 | out: | |
1981 | put_task_struct(task); | |
1982 | out_no_task: | |
1983 | return length; | |
1984 | } | |
1985 | ||
00977a59 | 1986 | static const struct file_operations proc_pid_attr_operations = { |
28a6d671 EB |
1987 | .read = proc_pid_attr_read, |
1988 | .write = proc_pid_attr_write, | |
1989 | }; | |
1990 | ||
c5141e6d | 1991 | static const struct pid_entry attr_dir_stuff[] = { |
61a28784 EB |
1992 | REG("current", S_IRUGO|S_IWUGO, pid_attr), |
1993 | REG("prev", S_IRUGO, pid_attr), | |
1994 | REG("exec", S_IRUGO|S_IWUGO, pid_attr), | |
1995 | REG("fscreate", S_IRUGO|S_IWUGO, pid_attr), | |
1996 | REG("keycreate", S_IRUGO|S_IWUGO, pid_attr), | |
1997 | REG("sockcreate", S_IRUGO|S_IWUGO, pid_attr), | |
28a6d671 EB |
1998 | }; |
1999 | ||
72d9dcfc | 2000 | static int proc_attr_dir_readdir(struct file * filp, |
28a6d671 EB |
2001 | void * dirent, filldir_t filldir) |
2002 | { | |
2003 | return proc_pident_readdir(filp,dirent,filldir, | |
72d9dcfc | 2004 | attr_dir_stuff,ARRAY_SIZE(attr_dir_stuff)); |
28a6d671 EB |
2005 | } |
2006 | ||
00977a59 | 2007 | static const struct file_operations proc_attr_dir_operations = { |
1da177e4 | 2008 | .read = generic_read_dir, |
72d9dcfc | 2009 | .readdir = proc_attr_dir_readdir, |
1da177e4 LT |
2010 | }; |
2011 | ||
72d9dcfc | 2012 | static struct dentry *proc_attr_dir_lookup(struct inode *dir, |
28a6d671 EB |
2013 | struct dentry *dentry, struct nameidata *nd) |
2014 | { | |
7bcd6b0e EB |
2015 | return proc_pident_lookup(dir, dentry, |
2016 | attr_dir_stuff, ARRAY_SIZE(attr_dir_stuff)); | |
28a6d671 EB |
2017 | } |
2018 | ||
c5ef1c42 | 2019 | static const struct inode_operations proc_attr_dir_inode_operations = { |
72d9dcfc | 2020 | .lookup = proc_attr_dir_lookup, |
99f89551 | 2021 | .getattr = pid_getattr, |
6d76fa58 | 2022 | .setattr = proc_setattr, |
1da177e4 LT |
2023 | }; |
2024 | ||
28a6d671 EB |
2025 | #endif |
2026 | ||
3cb4a0bb KH |
2027 | #if defined(USE_ELF_CORE_DUMP) && defined(CONFIG_ELF_CORE) |
2028 | static ssize_t proc_coredump_filter_read(struct file *file, char __user *buf, | |
2029 | size_t count, loff_t *ppos) | |
2030 | { | |
2031 | struct task_struct *task = get_proc_task(file->f_dentry->d_inode); | |
2032 | struct mm_struct *mm; | |
2033 | char buffer[PROC_NUMBUF]; | |
2034 | size_t len; | |
2035 | int ret; | |
2036 | ||
2037 | if (!task) | |
2038 | return -ESRCH; | |
2039 | ||
2040 | ret = 0; | |
2041 | mm = get_task_mm(task); | |
2042 | if (mm) { | |
2043 | len = snprintf(buffer, sizeof(buffer), "%08lx\n", | |
2044 | ((mm->flags & MMF_DUMP_FILTER_MASK) >> | |
2045 | MMF_DUMP_FILTER_SHIFT)); | |
2046 | mmput(mm); | |
2047 | ret = simple_read_from_buffer(buf, count, ppos, buffer, len); | |
2048 | } | |
2049 | ||
2050 | put_task_struct(task); | |
2051 | ||
2052 | return ret; | |
2053 | } | |
2054 | ||
2055 | static ssize_t proc_coredump_filter_write(struct file *file, | |
2056 | const char __user *buf, | |
2057 | size_t count, | |
2058 | loff_t *ppos) | |
2059 | { | |
2060 | struct task_struct *task; | |
2061 | struct mm_struct *mm; | |
2062 | char buffer[PROC_NUMBUF], *end; | |
2063 | unsigned int val; | |
2064 | int ret; | |
2065 | int i; | |
2066 | unsigned long mask; | |
2067 | ||
2068 | ret = -EFAULT; | |
2069 | memset(buffer, 0, sizeof(buffer)); | |
2070 | if (count > sizeof(buffer) - 1) | |
2071 | count = sizeof(buffer) - 1; | |
2072 | if (copy_from_user(buffer, buf, count)) | |
2073 | goto out_no_task; | |
2074 | ||
2075 | ret = -EINVAL; | |
2076 | val = (unsigned int)simple_strtoul(buffer, &end, 0); | |
2077 | if (*end == '\n') | |
2078 | end++; | |
2079 | if (end - buffer == 0) | |
2080 | goto out_no_task; | |
2081 | ||
2082 | ret = -ESRCH; | |
2083 | task = get_proc_task(file->f_dentry->d_inode); | |
2084 | if (!task) | |
2085 | goto out_no_task; | |
2086 | ||
2087 | ret = end - buffer; | |
2088 | mm = get_task_mm(task); | |
2089 | if (!mm) | |
2090 | goto out_no_mm; | |
2091 | ||
2092 | for (i = 0, mask = 1; i < MMF_DUMP_FILTER_BITS; i++, mask <<= 1) { | |
2093 | if (val & mask) | |
2094 | set_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags); | |
2095 | else | |
2096 | clear_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags); | |
2097 | } | |
2098 | ||
2099 | mmput(mm); | |
2100 | out_no_mm: | |
2101 | put_task_struct(task); | |
2102 | out_no_task: | |
2103 | return ret; | |
2104 | } | |
2105 | ||
2106 | static const struct file_operations proc_coredump_filter_operations = { | |
2107 | .read = proc_coredump_filter_read, | |
2108 | .write = proc_coredump_filter_write, | |
2109 | }; | |
2110 | #endif | |
2111 | ||
28a6d671 EB |
2112 | /* |
2113 | * /proc/self: | |
2114 | */ | |
2115 | static int proc_self_readlink(struct dentry *dentry, char __user *buffer, | |
2116 | int buflen) | |
2117 | { | |
488e5bc4 | 2118 | struct pid_namespace *ns = dentry->d_sb->s_fs_info; |
b55fcb22 | 2119 | pid_t tgid = task_tgid_nr_ns(current, ns); |
28a6d671 | 2120 | char tmp[PROC_NUMBUF]; |
b55fcb22 | 2121 | if (!tgid) |
488e5bc4 | 2122 | return -ENOENT; |
b55fcb22 | 2123 | sprintf(tmp, "%d", tgid); |
28a6d671 EB |
2124 | return vfs_readlink(dentry,buffer,buflen,tmp); |
2125 | } | |
2126 | ||
2127 | static void *proc_self_follow_link(struct dentry *dentry, struct nameidata *nd) | |
2128 | { | |
488e5bc4 | 2129 | struct pid_namespace *ns = dentry->d_sb->s_fs_info; |
b55fcb22 | 2130 | pid_t tgid = task_tgid_nr_ns(current, ns); |
28a6d671 | 2131 | char tmp[PROC_NUMBUF]; |
b55fcb22 | 2132 | if (!tgid) |
488e5bc4 | 2133 | return ERR_PTR(-ENOENT); |
b55fcb22 | 2134 | sprintf(tmp, "%d", task_tgid_nr_ns(current, ns)); |
28a6d671 EB |
2135 | return ERR_PTR(vfs_follow_link(nd,tmp)); |
2136 | } | |
2137 | ||
c5ef1c42 | 2138 | static const struct inode_operations proc_self_inode_operations = { |
28a6d671 EB |
2139 | .readlink = proc_self_readlink, |
2140 | .follow_link = proc_self_follow_link, | |
2141 | }; | |
2142 | ||
801199ce EB |
2143 | /* |
2144 | * proc base | |
2145 | * | |
2146 | * These are the directory entries in the root directory of /proc | |
2147 | * that properly belong to the /proc filesystem, as they describe | |
2148 | * describe something that is process related. | |
2149 | */ | |
c5141e6d | 2150 | static const struct pid_entry proc_base_stuff[] = { |
61a28784 | 2151 | NOD("self", S_IFLNK|S_IRWXUGO, |
801199ce | 2152 | &proc_self_inode_operations, NULL, {}), |
801199ce EB |
2153 | }; |
2154 | ||
2155 | /* | |
2156 | * Exceptional case: normally we are not allowed to unhash a busy | |
2157 | * directory. In this case, however, we can do it - no aliasing problems | |
2158 | * due to the way we treat inodes. | |
2159 | */ | |
2160 | static int proc_base_revalidate(struct dentry *dentry, struct nameidata *nd) | |
2161 | { | |
2162 | struct inode *inode = dentry->d_inode; | |
2163 | struct task_struct *task = get_proc_task(inode); | |
2164 | if (task) { | |
2165 | put_task_struct(task); | |
2166 | return 1; | |
2167 | } | |
2168 | d_drop(dentry); | |
2169 | return 0; | |
2170 | } | |
2171 | ||
2172 | static struct dentry_operations proc_base_dentry_operations = | |
2173 | { | |
2174 | .d_revalidate = proc_base_revalidate, | |
2175 | .d_delete = pid_delete_dentry, | |
2176 | }; | |
2177 | ||
444ceed8 | 2178 | static struct dentry *proc_base_instantiate(struct inode *dir, |
c5141e6d | 2179 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
801199ce | 2180 | { |
c5141e6d | 2181 | const struct pid_entry *p = ptr; |
801199ce | 2182 | struct inode *inode; |
801199ce | 2183 | struct proc_inode *ei; |
444ceed8 | 2184 | struct dentry *error = ERR_PTR(-EINVAL); |
801199ce EB |
2185 | |
2186 | /* Allocate the inode */ | |
2187 | error = ERR_PTR(-ENOMEM); | |
2188 | inode = new_inode(dir->i_sb); | |
2189 | if (!inode) | |
2190 | goto out; | |
2191 | ||
2192 | /* Initialize the inode */ | |
2193 | ei = PROC_I(inode); | |
2194 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; | |
801199ce EB |
2195 | |
2196 | /* | |
2197 | * grab the reference to the task. | |
2198 | */ | |
1a657f78 | 2199 | ei->pid = get_task_pid(task, PIDTYPE_PID); |
801199ce EB |
2200 | if (!ei->pid) |
2201 | goto out_iput; | |
2202 | ||
2203 | inode->i_uid = 0; | |
2204 | inode->i_gid = 0; | |
2205 | inode->i_mode = p->mode; | |
2206 | if (S_ISDIR(inode->i_mode)) | |
2207 | inode->i_nlink = 2; | |
2208 | if (S_ISLNK(inode->i_mode)) | |
2209 | inode->i_size = 64; | |
2210 | if (p->iop) | |
2211 | inode->i_op = p->iop; | |
2212 | if (p->fop) | |
2213 | inode->i_fop = p->fop; | |
2214 | ei->op = p->op; | |
2215 | dentry->d_op = &proc_base_dentry_operations; | |
2216 | d_add(dentry, inode); | |
2217 | error = NULL; | |
2218 | out: | |
801199ce EB |
2219 | return error; |
2220 | out_iput: | |
2221 | iput(inode); | |
2222 | goto out; | |
2223 | } | |
2224 | ||
444ceed8 EB |
2225 | static struct dentry *proc_base_lookup(struct inode *dir, struct dentry *dentry) |
2226 | { | |
2227 | struct dentry *error; | |
2228 | struct task_struct *task = get_proc_task(dir); | |
c5141e6d | 2229 | const struct pid_entry *p, *last; |
444ceed8 EB |
2230 | |
2231 | error = ERR_PTR(-ENOENT); | |
2232 | ||
2233 | if (!task) | |
2234 | goto out_no_task; | |
2235 | ||
2236 | /* Lookup the directory entry */ | |
7bcd6b0e EB |
2237 | last = &proc_base_stuff[ARRAY_SIZE(proc_base_stuff) - 1]; |
2238 | for (p = proc_base_stuff; p <= last; p++) { | |
444ceed8 EB |
2239 | if (p->len != dentry->d_name.len) |
2240 | continue; | |
2241 | if (!memcmp(dentry->d_name.name, p->name, p->len)) | |
2242 | break; | |
2243 | } | |
7bcd6b0e | 2244 | if (p > last) |
444ceed8 EB |
2245 | goto out; |
2246 | ||
2247 | error = proc_base_instantiate(dir, dentry, task, p); | |
2248 | ||
2249 | out: | |
2250 | put_task_struct(task); | |
2251 | out_no_task: | |
2252 | return error; | |
2253 | } | |
2254 | ||
c5141e6d ED |
2255 | static int proc_base_fill_cache(struct file *filp, void *dirent, |
2256 | filldir_t filldir, struct task_struct *task, const struct pid_entry *p) | |
61a28784 EB |
2257 | { |
2258 | return proc_fill_cache(filp, dirent, filldir, p->name, p->len, | |
2259 | proc_base_instantiate, task, p); | |
2260 | } | |
2261 | ||
aba76fdb AM |
2262 | #ifdef CONFIG_TASK_IO_ACCOUNTING |
2263 | static int proc_pid_io_accounting(struct task_struct *task, char *buffer) | |
2264 | { | |
2265 | return sprintf(buffer, | |
4b98d11b | 2266 | #ifdef CONFIG_TASK_XACCT |
aba76fdb AM |
2267 | "rchar: %llu\n" |
2268 | "wchar: %llu\n" | |
2269 | "syscr: %llu\n" | |
2270 | "syscw: %llu\n" | |
4b98d11b | 2271 | #endif |
aba76fdb AM |
2272 | "read_bytes: %llu\n" |
2273 | "write_bytes: %llu\n" | |
2274 | "cancelled_write_bytes: %llu\n", | |
4b98d11b | 2275 | #ifdef CONFIG_TASK_XACCT |
aba76fdb AM |
2276 | (unsigned long long)task->rchar, |
2277 | (unsigned long long)task->wchar, | |
2278 | (unsigned long long)task->syscr, | |
2279 | (unsigned long long)task->syscw, | |
4b98d11b | 2280 | #endif |
aba76fdb AM |
2281 | (unsigned long long)task->ioac.read_bytes, |
2282 | (unsigned long long)task->ioac.write_bytes, | |
2283 | (unsigned long long)task->ioac.cancelled_write_bytes); | |
2284 | } | |
2285 | #endif | |
2286 | ||
28a6d671 EB |
2287 | /* |
2288 | * Thread groups | |
2289 | */ | |
00977a59 | 2290 | static const struct file_operations proc_task_operations; |
c5ef1c42 | 2291 | static const struct inode_operations proc_task_inode_operations; |
20cdc894 | 2292 | |
c5141e6d | 2293 | static const struct pid_entry tgid_base_stuff[] = { |
61a28784 EB |
2294 | DIR("task", S_IRUGO|S_IXUGO, task), |
2295 | DIR("fd", S_IRUSR|S_IXUSR, fd), | |
27932742 | 2296 | DIR("fdinfo", S_IRUSR|S_IXUSR, fdinfo), |
b2211a36 | 2297 | #ifdef CONFIG_NET |
4f42c288 | 2298 | DIR("net", S_IRUGO|S_IXUGO, net), |
b2211a36 | 2299 | #endif |
315e28c8 | 2300 | REG("environ", S_IRUSR, environ), |
61a28784 | 2301 | INF("auxv", S_IRUSR, pid_auxv), |
df5f8314 | 2302 | ONE("status", S_IRUGO, pid_status), |
d85f50d5 | 2303 | INF("limits", S_IRUSR, pid_limits), |
43ae34cb IM |
2304 | #ifdef CONFIG_SCHED_DEBUG |
2305 | REG("sched", S_IRUGO|S_IWUSR, pid_sched), | |
2306 | #endif | |
61a28784 | 2307 | INF("cmdline", S_IRUGO, pid_cmdline), |
ee992744 | 2308 | ONE("stat", S_IRUGO, tgid_stat), |
a56d3fc7 | 2309 | ONE("statm", S_IRUGO, pid_statm), |
61a28784 | 2310 | REG("maps", S_IRUGO, maps), |
28a6d671 | 2311 | #ifdef CONFIG_NUMA |
61a28784 | 2312 | REG("numa_maps", S_IRUGO, numa_maps), |
28a6d671 | 2313 | #endif |
61a28784 | 2314 | REG("mem", S_IRUSR|S_IWUSR, mem), |
61a28784 EB |
2315 | LNK("cwd", cwd), |
2316 | LNK("root", root), | |
2317 | LNK("exe", exe), | |
2318 | REG("mounts", S_IRUGO, mounts), | |
2d4d4864 | 2319 | REG("mountinfo", S_IRUGO, mountinfo), |
61a28784 | 2320 | REG("mountstats", S_IRUSR, mountstats), |
1e883281 | 2321 | #ifdef CONFIG_PROC_PAGE_MONITOR |
b813e931 | 2322 | REG("clear_refs", S_IWUSR, clear_refs), |
61a28784 | 2323 | REG("smaps", S_IRUGO, smaps), |
85863e47 | 2324 | REG("pagemap", S_IRUSR, pagemap), |
28a6d671 EB |
2325 | #endif |
2326 | #ifdef CONFIG_SECURITY | |
72d9dcfc | 2327 | DIR("attr", S_IRUGO|S_IXUGO, attr_dir), |
28a6d671 EB |
2328 | #endif |
2329 | #ifdef CONFIG_KALLSYMS | |
61a28784 | 2330 | INF("wchan", S_IRUGO, pid_wchan), |
28a6d671 EB |
2331 | #endif |
2332 | #ifdef CONFIG_SCHEDSTATS | |
61a28784 | 2333 | INF("schedstat", S_IRUGO, pid_schedstat), |
28a6d671 | 2334 | #endif |
9745512c AV |
2335 | #ifdef CONFIG_LATENCYTOP |
2336 | REG("latency", S_IRUGO, lstats), | |
2337 | #endif | |
8793d854 | 2338 | #ifdef CONFIG_PROC_PID_CPUSET |
61a28784 | 2339 | REG("cpuset", S_IRUGO, cpuset), |
a424316c PM |
2340 | #endif |
2341 | #ifdef CONFIG_CGROUPS | |
2342 | REG("cgroup", S_IRUGO, cgroup), | |
28a6d671 | 2343 | #endif |
61a28784 EB |
2344 | INF("oom_score", S_IRUGO, oom_score), |
2345 | REG("oom_adj", S_IRUGO|S_IWUSR, oom_adjust), | |
28a6d671 | 2346 | #ifdef CONFIG_AUDITSYSCALL |
61a28784 | 2347 | REG("loginuid", S_IWUSR|S_IRUGO, loginuid), |
1e0bd755 | 2348 | REG("sessionid", S_IRUSR, sessionid), |
28a6d671 | 2349 | #endif |
f4f154fd AM |
2350 | #ifdef CONFIG_FAULT_INJECTION |
2351 | REG("make-it-fail", S_IRUGO|S_IWUSR, fault_inject), | |
2352 | #endif | |
3cb4a0bb KH |
2353 | #if defined(USE_ELF_CORE_DUMP) && defined(CONFIG_ELF_CORE) |
2354 | REG("coredump_filter", S_IRUGO|S_IWUSR, coredump_filter), | |
2355 | #endif | |
aba76fdb AM |
2356 | #ifdef CONFIG_TASK_IO_ACCOUNTING |
2357 | INF("io", S_IRUGO, pid_io_accounting), | |
2358 | #endif | |
28a6d671 | 2359 | }; |
1da177e4 | 2360 | |
28a6d671 | 2361 | static int proc_tgid_base_readdir(struct file * filp, |
1da177e4 LT |
2362 | void * dirent, filldir_t filldir) |
2363 | { | |
2364 | return proc_pident_readdir(filp,dirent,filldir, | |
28a6d671 | 2365 | tgid_base_stuff,ARRAY_SIZE(tgid_base_stuff)); |
1da177e4 LT |
2366 | } |
2367 | ||
00977a59 | 2368 | static const struct file_operations proc_tgid_base_operations = { |
1da177e4 | 2369 | .read = generic_read_dir, |
28a6d671 | 2370 | .readdir = proc_tgid_base_readdir, |
1da177e4 LT |
2371 | }; |
2372 | ||
28a6d671 | 2373 | static struct dentry *proc_tgid_base_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd){ |
7bcd6b0e EB |
2374 | return proc_pident_lookup(dir, dentry, |
2375 | tgid_base_stuff, ARRAY_SIZE(tgid_base_stuff)); | |
1da177e4 LT |
2376 | } |
2377 | ||
c5ef1c42 | 2378 | static const struct inode_operations proc_tgid_base_inode_operations = { |
28a6d671 | 2379 | .lookup = proc_tgid_base_lookup, |
99f89551 | 2380 | .getattr = pid_getattr, |
6d76fa58 | 2381 | .setattr = proc_setattr, |
1da177e4 | 2382 | }; |
1da177e4 | 2383 | |
60347f67 | 2384 | static void proc_flush_task_mnt(struct vfsmount *mnt, pid_t pid, pid_t tgid) |
1da177e4 | 2385 | { |
48e6484d | 2386 | struct dentry *dentry, *leader, *dir; |
8578cea7 | 2387 | char buf[PROC_NUMBUF]; |
48e6484d EB |
2388 | struct qstr name; |
2389 | ||
2390 | name.name = buf; | |
60347f67 PE |
2391 | name.len = snprintf(buf, sizeof(buf), "%d", pid); |
2392 | dentry = d_hash_and_lookup(mnt->mnt_root, &name); | |
48e6484d | 2393 | if (dentry) { |
7766755a AA |
2394 | if (!(current->flags & PF_EXITING)) |
2395 | shrink_dcache_parent(dentry); | |
48e6484d EB |
2396 | d_drop(dentry); |
2397 | dput(dentry); | |
2398 | } | |
1da177e4 | 2399 | |
60347f67 | 2400 | if (tgid == 0) |
48e6484d | 2401 | goto out; |
1da177e4 | 2402 | |
48e6484d | 2403 | name.name = buf; |
60347f67 PE |
2404 | name.len = snprintf(buf, sizeof(buf), "%d", tgid); |
2405 | leader = d_hash_and_lookup(mnt->mnt_root, &name); | |
48e6484d EB |
2406 | if (!leader) |
2407 | goto out; | |
1da177e4 | 2408 | |
48e6484d EB |
2409 | name.name = "task"; |
2410 | name.len = strlen(name.name); | |
2411 | dir = d_hash_and_lookup(leader, &name); | |
2412 | if (!dir) | |
2413 | goto out_put_leader; | |
2414 | ||
2415 | name.name = buf; | |
60347f67 | 2416 | name.len = snprintf(buf, sizeof(buf), "%d", pid); |
48e6484d EB |
2417 | dentry = d_hash_and_lookup(dir, &name); |
2418 | if (dentry) { | |
2419 | shrink_dcache_parent(dentry); | |
2420 | d_drop(dentry); | |
2421 | dput(dentry); | |
1da177e4 | 2422 | } |
48e6484d EB |
2423 | |
2424 | dput(dir); | |
2425 | out_put_leader: | |
2426 | dput(leader); | |
2427 | out: | |
2428 | return; | |
1da177e4 LT |
2429 | } |
2430 | ||
0895e91d RD |
2431 | /** |
2432 | * proc_flush_task - Remove dcache entries for @task from the /proc dcache. | |
2433 | * @task: task that should be flushed. | |
2434 | * | |
2435 | * When flushing dentries from proc, one needs to flush them from global | |
60347f67 | 2436 | * proc (proc_mnt) and from all the namespaces' procs this task was seen |
0895e91d RD |
2437 | * in. This call is supposed to do all of this job. |
2438 | * | |
2439 | * Looks in the dcache for | |
2440 | * /proc/@pid | |
2441 | * /proc/@tgid/task/@pid | |
2442 | * if either directory is present flushes it and all of it'ts children | |
2443 | * from the dcache. | |
2444 | * | |
2445 | * It is safe and reasonable to cache /proc entries for a task until | |
2446 | * that task exits. After that they just clog up the dcache with | |
2447 | * useless entries, possibly causing useful dcache entries to be | |
2448 | * flushed instead. This routine is proved to flush those useless | |
2449 | * dcache entries at process exit time. | |
2450 | * | |
2451 | * NOTE: This routine is just an optimization so it does not guarantee | |
2452 | * that no dcache entries will exist at process exit time it | |
2453 | * just makes it very unlikely that any will persist. | |
60347f67 PE |
2454 | */ |
2455 | ||
2456 | void proc_flush_task(struct task_struct *task) | |
2457 | { | |
9fcc2d15 EB |
2458 | int i; |
2459 | struct pid *pid, *tgid = NULL; | |
130f77ec PE |
2460 | struct upid *upid; |
2461 | ||
130f77ec | 2462 | pid = task_pid(task); |
9fcc2d15 EB |
2463 | if (thread_group_leader(task)) |
2464 | tgid = task_tgid(task); | |
130f77ec | 2465 | |
9fcc2d15 | 2466 | for (i = 0; i <= pid->level; i++) { |
130f77ec PE |
2467 | upid = &pid->numbers[i]; |
2468 | proc_flush_task_mnt(upid->ns->proc_mnt, upid->nr, | |
9fcc2d15 | 2469 | tgid ? tgid->numbers[i].nr : 0); |
130f77ec | 2470 | } |
6f4e6433 PE |
2471 | |
2472 | upid = &pid->numbers[pid->level]; | |
2473 | if (upid->nr == 1) | |
2474 | pid_ns_release_proc(upid->ns); | |
60347f67 PE |
2475 | } |
2476 | ||
9711ef99 AB |
2477 | static struct dentry *proc_pid_instantiate(struct inode *dir, |
2478 | struct dentry * dentry, | |
c5141e6d | 2479 | struct task_struct *task, const void *ptr) |
444ceed8 EB |
2480 | { |
2481 | struct dentry *error = ERR_PTR(-ENOENT); | |
2482 | struct inode *inode; | |
2483 | ||
61a28784 | 2484 | inode = proc_pid_make_inode(dir->i_sb, task); |
444ceed8 EB |
2485 | if (!inode) |
2486 | goto out; | |
2487 | ||
2488 | inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO; | |
2489 | inode->i_op = &proc_tgid_base_inode_operations; | |
2490 | inode->i_fop = &proc_tgid_base_operations; | |
2491 | inode->i_flags|=S_IMMUTABLE; | |
27932742 | 2492 | inode->i_nlink = 5; |
444ceed8 EB |
2493 | #ifdef CONFIG_SECURITY |
2494 | inode->i_nlink += 1; | |
2495 | #endif | |
2496 | ||
2497 | dentry->d_op = &pid_dentry_operations; | |
2498 | ||
2499 | d_add(dentry, inode); | |
2500 | /* Close the race of the process dying before we return the dentry */ | |
2501 | if (pid_revalidate(dentry, NULL)) | |
2502 | error = NULL; | |
2503 | out: | |
2504 | return error; | |
2505 | } | |
2506 | ||
1da177e4 LT |
2507 | struct dentry *proc_pid_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd) |
2508 | { | |
cd6a3ce9 | 2509 | struct dentry *result = ERR_PTR(-ENOENT); |
1da177e4 | 2510 | struct task_struct *task; |
1da177e4 | 2511 | unsigned tgid; |
b488893a | 2512 | struct pid_namespace *ns; |
1da177e4 | 2513 | |
801199ce EB |
2514 | result = proc_base_lookup(dir, dentry); |
2515 | if (!IS_ERR(result) || PTR_ERR(result) != -ENOENT) | |
2516 | goto out; | |
2517 | ||
1da177e4 LT |
2518 | tgid = name_to_int(dentry); |
2519 | if (tgid == ~0U) | |
2520 | goto out; | |
2521 | ||
b488893a | 2522 | ns = dentry->d_sb->s_fs_info; |
de758734 | 2523 | rcu_read_lock(); |
b488893a | 2524 | task = find_task_by_pid_ns(tgid, ns); |
1da177e4 LT |
2525 | if (task) |
2526 | get_task_struct(task); | |
de758734 | 2527 | rcu_read_unlock(); |
1da177e4 LT |
2528 | if (!task) |
2529 | goto out; | |
2530 | ||
444ceed8 | 2531 | result = proc_pid_instantiate(dir, dentry, task, NULL); |
1da177e4 | 2532 | put_task_struct(task); |
1da177e4 | 2533 | out: |
cd6a3ce9 | 2534 | return result; |
1da177e4 LT |
2535 | } |
2536 | ||
1da177e4 | 2537 | /* |
0804ef4b | 2538 | * Find the first task with tgid >= tgid |
0bc58a91 | 2539 | * |
1da177e4 | 2540 | */ |
19fd4bb2 EB |
2541 | struct tgid_iter { |
2542 | unsigned int tgid; | |
0804ef4b | 2543 | struct task_struct *task; |
19fd4bb2 EB |
2544 | }; |
2545 | static struct tgid_iter next_tgid(struct pid_namespace *ns, struct tgid_iter iter) | |
2546 | { | |
0804ef4b | 2547 | struct pid *pid; |
1da177e4 | 2548 | |
19fd4bb2 EB |
2549 | if (iter.task) |
2550 | put_task_struct(iter.task); | |
454cc105 | 2551 | rcu_read_lock(); |
0804ef4b | 2552 | retry: |
19fd4bb2 EB |
2553 | iter.task = NULL; |
2554 | pid = find_ge_pid(iter.tgid, ns); | |
0804ef4b | 2555 | if (pid) { |
19fd4bb2 EB |
2556 | iter.tgid = pid_nr_ns(pid, ns); |
2557 | iter.task = pid_task(pid, PIDTYPE_PID); | |
0804ef4b EB |
2558 | /* What we to know is if the pid we have find is the |
2559 | * pid of a thread_group_leader. Testing for task | |
2560 | * being a thread_group_leader is the obvious thing | |
2561 | * todo but there is a window when it fails, due to | |
2562 | * the pid transfer logic in de_thread. | |
2563 | * | |
2564 | * So we perform the straight forward test of seeing | |
2565 | * if the pid we have found is the pid of a thread | |
2566 | * group leader, and don't worry if the task we have | |
2567 | * found doesn't happen to be a thread group leader. | |
2568 | * As we don't care in the case of readdir. | |
2569 | */ | |
19fd4bb2 EB |
2570 | if (!iter.task || !has_group_leader_pid(iter.task)) { |
2571 | iter.tgid += 1; | |
0804ef4b | 2572 | goto retry; |
19fd4bb2 EB |
2573 | } |
2574 | get_task_struct(iter.task); | |
0bc58a91 | 2575 | } |
454cc105 | 2576 | rcu_read_unlock(); |
19fd4bb2 | 2577 | return iter; |
1da177e4 LT |
2578 | } |
2579 | ||
7bcd6b0e | 2580 | #define TGID_OFFSET (FIRST_PROCESS_ENTRY + ARRAY_SIZE(proc_base_stuff)) |
0804ef4b | 2581 | |
61a28784 | 2582 | static int proc_pid_fill_cache(struct file *filp, void *dirent, filldir_t filldir, |
19fd4bb2 | 2583 | struct tgid_iter iter) |
61a28784 EB |
2584 | { |
2585 | char name[PROC_NUMBUF]; | |
19fd4bb2 | 2586 | int len = snprintf(name, sizeof(name), "%d", iter.tgid); |
61a28784 | 2587 | return proc_fill_cache(filp, dirent, filldir, name, len, |
19fd4bb2 | 2588 | proc_pid_instantiate, iter.task, NULL); |
61a28784 EB |
2589 | } |
2590 | ||
1da177e4 LT |
2591 | /* for the /proc/ directory itself, after non-process stuff has been done */ |
2592 | int proc_pid_readdir(struct file * filp, void * dirent, filldir_t filldir) | |
2593 | { | |
1da177e4 | 2594 | unsigned int nr = filp->f_pos - FIRST_PROCESS_ENTRY; |
2fddfeef | 2595 | struct task_struct *reaper = get_proc_task(filp->f_path.dentry->d_inode); |
19fd4bb2 | 2596 | struct tgid_iter iter; |
b488893a | 2597 | struct pid_namespace *ns; |
1da177e4 | 2598 | |
61a28784 EB |
2599 | if (!reaper) |
2600 | goto out_no_task; | |
2601 | ||
7bcd6b0e | 2602 | for (; nr < ARRAY_SIZE(proc_base_stuff); filp->f_pos++, nr++) { |
c5141e6d | 2603 | const struct pid_entry *p = &proc_base_stuff[nr]; |
61a28784 | 2604 | if (proc_base_fill_cache(filp, dirent, filldir, reaper, p) < 0) |
801199ce | 2605 | goto out; |
1da177e4 LT |
2606 | } |
2607 | ||
b488893a | 2608 | ns = filp->f_dentry->d_sb->s_fs_info; |
19fd4bb2 EB |
2609 | iter.task = NULL; |
2610 | iter.tgid = filp->f_pos - TGID_OFFSET; | |
2611 | for (iter = next_tgid(ns, iter); | |
2612 | iter.task; | |
2613 | iter.tgid += 1, iter = next_tgid(ns, iter)) { | |
2614 | filp->f_pos = iter.tgid + TGID_OFFSET; | |
2615 | if (proc_pid_fill_cache(filp, dirent, filldir, iter) < 0) { | |
2616 | put_task_struct(iter.task); | |
0804ef4b | 2617 | goto out; |
1da177e4 | 2618 | } |
0bc58a91 | 2619 | } |
0804ef4b EB |
2620 | filp->f_pos = PID_MAX_LIMIT + TGID_OFFSET; |
2621 | out: | |
61a28784 EB |
2622 | put_task_struct(reaper); |
2623 | out_no_task: | |
0bc58a91 EB |
2624 | return 0; |
2625 | } | |
1da177e4 | 2626 | |
28a6d671 EB |
2627 | /* |
2628 | * Tasks | |
2629 | */ | |
c5141e6d | 2630 | static const struct pid_entry tid_base_stuff[] = { |
61a28784 | 2631 | DIR("fd", S_IRUSR|S_IXUSR, fd), |
27932742 | 2632 | DIR("fdinfo", S_IRUSR|S_IXUSR, fdinfo), |
315e28c8 | 2633 | REG("environ", S_IRUSR, environ), |
61a28784 | 2634 | INF("auxv", S_IRUSR, pid_auxv), |
df5f8314 | 2635 | ONE("status", S_IRUGO, pid_status), |
d85f50d5 | 2636 | INF("limits", S_IRUSR, pid_limits), |
43ae34cb IM |
2637 | #ifdef CONFIG_SCHED_DEBUG |
2638 | REG("sched", S_IRUGO|S_IWUSR, pid_sched), | |
2639 | #endif | |
61a28784 | 2640 | INF("cmdline", S_IRUGO, pid_cmdline), |
ee992744 | 2641 | ONE("stat", S_IRUGO, tid_stat), |
a56d3fc7 | 2642 | ONE("statm", S_IRUGO, pid_statm), |
61a28784 | 2643 | REG("maps", S_IRUGO, maps), |
28a6d671 | 2644 | #ifdef CONFIG_NUMA |
61a28784 | 2645 | REG("numa_maps", S_IRUGO, numa_maps), |
28a6d671 | 2646 | #endif |
61a28784 | 2647 | REG("mem", S_IRUSR|S_IWUSR, mem), |
61a28784 EB |
2648 | LNK("cwd", cwd), |
2649 | LNK("root", root), | |
2650 | LNK("exe", exe), | |
2651 | REG("mounts", S_IRUGO, mounts), | |
2d4d4864 | 2652 | REG("mountinfo", S_IRUGO, mountinfo), |
1e883281 | 2653 | #ifdef CONFIG_PROC_PAGE_MONITOR |
b813e931 | 2654 | REG("clear_refs", S_IWUSR, clear_refs), |
61a28784 | 2655 | REG("smaps", S_IRUGO, smaps), |
85863e47 | 2656 | REG("pagemap", S_IRUSR, pagemap), |
28a6d671 EB |
2657 | #endif |
2658 | #ifdef CONFIG_SECURITY | |
72d9dcfc | 2659 | DIR("attr", S_IRUGO|S_IXUGO, attr_dir), |
28a6d671 EB |
2660 | #endif |
2661 | #ifdef CONFIG_KALLSYMS | |
61a28784 | 2662 | INF("wchan", S_IRUGO, pid_wchan), |
28a6d671 EB |
2663 | #endif |
2664 | #ifdef CONFIG_SCHEDSTATS | |
61a28784 | 2665 | INF("schedstat", S_IRUGO, pid_schedstat), |
28a6d671 | 2666 | #endif |
9745512c AV |
2667 | #ifdef CONFIG_LATENCYTOP |
2668 | REG("latency", S_IRUGO, lstats), | |
2669 | #endif | |
8793d854 | 2670 | #ifdef CONFIG_PROC_PID_CPUSET |
61a28784 | 2671 | REG("cpuset", S_IRUGO, cpuset), |
a424316c PM |
2672 | #endif |
2673 | #ifdef CONFIG_CGROUPS | |
2674 | REG("cgroup", S_IRUGO, cgroup), | |
28a6d671 | 2675 | #endif |
61a28784 EB |
2676 | INF("oom_score", S_IRUGO, oom_score), |
2677 | REG("oom_adj", S_IRUGO|S_IWUSR, oom_adjust), | |
28a6d671 | 2678 | #ifdef CONFIG_AUDITSYSCALL |
61a28784 | 2679 | REG("loginuid", S_IWUSR|S_IRUGO, loginuid), |
1e0bd755 | 2680 | REG("sessionid", S_IRUSR, sessionid), |
28a6d671 | 2681 | #endif |
f4f154fd AM |
2682 | #ifdef CONFIG_FAULT_INJECTION |
2683 | REG("make-it-fail", S_IRUGO|S_IWUSR, fault_inject), | |
2684 | #endif | |
28a6d671 EB |
2685 | }; |
2686 | ||
2687 | static int proc_tid_base_readdir(struct file * filp, | |
2688 | void * dirent, filldir_t filldir) | |
2689 | { | |
2690 | return proc_pident_readdir(filp,dirent,filldir, | |
2691 | tid_base_stuff,ARRAY_SIZE(tid_base_stuff)); | |
2692 | } | |
2693 | ||
2694 | static struct dentry *proc_tid_base_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd){ | |
7bcd6b0e EB |
2695 | return proc_pident_lookup(dir, dentry, |
2696 | tid_base_stuff, ARRAY_SIZE(tid_base_stuff)); | |
28a6d671 EB |
2697 | } |
2698 | ||
00977a59 | 2699 | static const struct file_operations proc_tid_base_operations = { |
28a6d671 EB |
2700 | .read = generic_read_dir, |
2701 | .readdir = proc_tid_base_readdir, | |
2702 | }; | |
2703 | ||
c5ef1c42 | 2704 | static const struct inode_operations proc_tid_base_inode_operations = { |
28a6d671 EB |
2705 | .lookup = proc_tid_base_lookup, |
2706 | .getattr = pid_getattr, | |
2707 | .setattr = proc_setattr, | |
2708 | }; | |
2709 | ||
444ceed8 | 2710 | static struct dentry *proc_task_instantiate(struct inode *dir, |
c5141e6d | 2711 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
444ceed8 EB |
2712 | { |
2713 | struct dentry *error = ERR_PTR(-ENOENT); | |
2714 | struct inode *inode; | |
61a28784 | 2715 | inode = proc_pid_make_inode(dir->i_sb, task); |
444ceed8 EB |
2716 | |
2717 | if (!inode) | |
2718 | goto out; | |
2719 | inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO; | |
2720 | inode->i_op = &proc_tid_base_inode_operations; | |
2721 | inode->i_fop = &proc_tid_base_operations; | |
2722 | inode->i_flags|=S_IMMUTABLE; | |
27932742 | 2723 | inode->i_nlink = 4; |
444ceed8 EB |
2724 | #ifdef CONFIG_SECURITY |
2725 | inode->i_nlink += 1; | |
2726 | #endif | |
2727 | ||
2728 | dentry->d_op = &pid_dentry_operations; | |
2729 | ||
2730 | d_add(dentry, inode); | |
2731 | /* Close the race of the process dying before we return the dentry */ | |
2732 | if (pid_revalidate(dentry, NULL)) | |
2733 | error = NULL; | |
2734 | out: | |
2735 | return error; | |
2736 | } | |
2737 | ||
28a6d671 EB |
2738 | static struct dentry *proc_task_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd) |
2739 | { | |
2740 | struct dentry *result = ERR_PTR(-ENOENT); | |
2741 | struct task_struct *task; | |
2742 | struct task_struct *leader = get_proc_task(dir); | |
28a6d671 | 2743 | unsigned tid; |
b488893a | 2744 | struct pid_namespace *ns; |
28a6d671 EB |
2745 | |
2746 | if (!leader) | |
2747 | goto out_no_task; | |
2748 | ||
2749 | tid = name_to_int(dentry); | |
2750 | if (tid == ~0U) | |
2751 | goto out; | |
2752 | ||
b488893a | 2753 | ns = dentry->d_sb->s_fs_info; |
28a6d671 | 2754 | rcu_read_lock(); |
b488893a | 2755 | task = find_task_by_pid_ns(tid, ns); |
28a6d671 EB |
2756 | if (task) |
2757 | get_task_struct(task); | |
2758 | rcu_read_unlock(); | |
2759 | if (!task) | |
2760 | goto out; | |
bac0abd6 | 2761 | if (!same_thread_group(leader, task)) |
28a6d671 EB |
2762 | goto out_drop_task; |
2763 | ||
444ceed8 | 2764 | result = proc_task_instantiate(dir, dentry, task, NULL); |
28a6d671 EB |
2765 | out_drop_task: |
2766 | put_task_struct(task); | |
2767 | out: | |
2768 | put_task_struct(leader); | |
2769 | out_no_task: | |
2770 | return result; | |
2771 | } | |
2772 | ||
0bc58a91 EB |
2773 | /* |
2774 | * Find the first tid of a thread group to return to user space. | |
2775 | * | |
2776 | * Usually this is just the thread group leader, but if the users | |
2777 | * buffer was too small or there was a seek into the middle of the | |
2778 | * directory we have more work todo. | |
2779 | * | |
2780 | * In the case of a short read we start with find_task_by_pid. | |
2781 | * | |
2782 | * In the case of a seek we start with the leader and walk nr | |
2783 | * threads past it. | |
2784 | */ | |
cc288738 | 2785 | static struct task_struct *first_tid(struct task_struct *leader, |
b488893a | 2786 | int tid, int nr, struct pid_namespace *ns) |
0bc58a91 | 2787 | { |
a872ff0c | 2788 | struct task_struct *pos; |
1da177e4 | 2789 | |
cc288738 | 2790 | rcu_read_lock(); |
0bc58a91 EB |
2791 | /* Attempt to start with the pid of a thread */ |
2792 | if (tid && (nr > 0)) { | |
b488893a | 2793 | pos = find_task_by_pid_ns(tid, ns); |
a872ff0c ON |
2794 | if (pos && (pos->group_leader == leader)) |
2795 | goto found; | |
0bc58a91 | 2796 | } |
1da177e4 | 2797 | |
0bc58a91 | 2798 | /* If nr exceeds the number of threads there is nothing todo */ |
a872ff0c ON |
2799 | pos = NULL; |
2800 | if (nr && nr >= get_nr_threads(leader)) | |
2801 | goto out; | |
1da177e4 | 2802 | |
a872ff0c ON |
2803 | /* If we haven't found our starting place yet start |
2804 | * with the leader and walk nr threads forward. | |
0bc58a91 | 2805 | */ |
a872ff0c ON |
2806 | for (pos = leader; nr > 0; --nr) { |
2807 | pos = next_thread(pos); | |
2808 | if (pos == leader) { | |
2809 | pos = NULL; | |
2810 | goto out; | |
2811 | } | |
1da177e4 | 2812 | } |
a872ff0c ON |
2813 | found: |
2814 | get_task_struct(pos); | |
2815 | out: | |
cc288738 | 2816 | rcu_read_unlock(); |
0bc58a91 EB |
2817 | return pos; |
2818 | } | |
2819 | ||
2820 | /* | |
2821 | * Find the next thread in the thread list. | |
2822 | * Return NULL if there is an error or no next thread. | |
2823 | * | |
2824 | * The reference to the input task_struct is released. | |
2825 | */ | |
2826 | static struct task_struct *next_tid(struct task_struct *start) | |
2827 | { | |
c1df7fb8 | 2828 | struct task_struct *pos = NULL; |
cc288738 | 2829 | rcu_read_lock(); |
c1df7fb8 | 2830 | if (pid_alive(start)) { |
0bc58a91 | 2831 | pos = next_thread(start); |
c1df7fb8 ON |
2832 | if (thread_group_leader(pos)) |
2833 | pos = NULL; | |
2834 | else | |
2835 | get_task_struct(pos); | |
2836 | } | |
cc288738 | 2837 | rcu_read_unlock(); |
0bc58a91 EB |
2838 | put_task_struct(start); |
2839 | return pos; | |
1da177e4 LT |
2840 | } |
2841 | ||
61a28784 EB |
2842 | static int proc_task_fill_cache(struct file *filp, void *dirent, filldir_t filldir, |
2843 | struct task_struct *task, int tid) | |
2844 | { | |
2845 | char name[PROC_NUMBUF]; | |
2846 | int len = snprintf(name, sizeof(name), "%d", tid); | |
2847 | return proc_fill_cache(filp, dirent, filldir, name, len, | |
2848 | proc_task_instantiate, task, NULL); | |
2849 | } | |
2850 | ||
1da177e4 LT |
2851 | /* for the /proc/TGID/task/ directories */ |
2852 | static int proc_task_readdir(struct file * filp, void * dirent, filldir_t filldir) | |
2853 | { | |
2fddfeef | 2854 | struct dentry *dentry = filp->f_path.dentry; |
1da177e4 | 2855 | struct inode *inode = dentry->d_inode; |
7d895244 | 2856 | struct task_struct *leader = NULL; |
0bc58a91 | 2857 | struct task_struct *task; |
1da177e4 LT |
2858 | int retval = -ENOENT; |
2859 | ino_t ino; | |
0bc58a91 | 2860 | int tid; |
1da177e4 | 2861 | unsigned long pos = filp->f_pos; /* avoiding "long long" filp->f_pos */ |
b488893a | 2862 | struct pid_namespace *ns; |
1da177e4 | 2863 | |
7d895244 GC |
2864 | task = get_proc_task(inode); |
2865 | if (!task) | |
2866 | goto out_no_task; | |
2867 | rcu_read_lock(); | |
2868 | if (pid_alive(task)) { | |
2869 | leader = task->group_leader; | |
2870 | get_task_struct(leader); | |
2871 | } | |
2872 | rcu_read_unlock(); | |
2873 | put_task_struct(task); | |
99f89551 EB |
2874 | if (!leader) |
2875 | goto out_no_task; | |
1da177e4 LT |
2876 | retval = 0; |
2877 | ||
2878 | switch (pos) { | |
2879 | case 0: | |
2880 | ino = inode->i_ino; | |
2881 | if (filldir(dirent, ".", 1, pos, ino, DT_DIR) < 0) | |
2882 | goto out; | |
2883 | pos++; | |
2884 | /* fall through */ | |
2885 | case 1: | |
2886 | ino = parent_ino(dentry); | |
2887 | if (filldir(dirent, "..", 2, pos, ino, DT_DIR) < 0) | |
2888 | goto out; | |
2889 | pos++; | |
2890 | /* fall through */ | |
2891 | } | |
2892 | ||
0bc58a91 EB |
2893 | /* f_version caches the tgid value that the last readdir call couldn't |
2894 | * return. lseek aka telldir automagically resets f_version to 0. | |
2895 | */ | |
b488893a | 2896 | ns = filp->f_dentry->d_sb->s_fs_info; |
2b47c361 | 2897 | tid = (int)filp->f_version; |
0bc58a91 | 2898 | filp->f_version = 0; |
b488893a | 2899 | for (task = first_tid(leader, tid, pos - 2, ns); |
0bc58a91 EB |
2900 | task; |
2901 | task = next_tid(task), pos++) { | |
b488893a | 2902 | tid = task_pid_nr_ns(task, ns); |
61a28784 | 2903 | if (proc_task_fill_cache(filp, dirent, filldir, task, tid) < 0) { |
0bc58a91 EB |
2904 | /* returning this tgid failed, save it as the first |
2905 | * pid for the next readir call */ | |
2b47c361 | 2906 | filp->f_version = (u64)tid; |
0bc58a91 | 2907 | put_task_struct(task); |
1da177e4 | 2908 | break; |
0bc58a91 | 2909 | } |
1da177e4 LT |
2910 | } |
2911 | out: | |
2912 | filp->f_pos = pos; | |
99f89551 EB |
2913 | put_task_struct(leader); |
2914 | out_no_task: | |
1da177e4 LT |
2915 | return retval; |
2916 | } | |
6e66b52b EB |
2917 | |
2918 | static int proc_task_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) | |
2919 | { | |
2920 | struct inode *inode = dentry->d_inode; | |
99f89551 | 2921 | struct task_struct *p = get_proc_task(inode); |
6e66b52b EB |
2922 | generic_fillattr(inode, stat); |
2923 | ||
99f89551 EB |
2924 | if (p) { |
2925 | rcu_read_lock(); | |
2926 | stat->nlink += get_nr_threads(p); | |
2927 | rcu_read_unlock(); | |
2928 | put_task_struct(p); | |
6e66b52b EB |
2929 | } |
2930 | ||
2931 | return 0; | |
2932 | } | |
28a6d671 | 2933 | |
c5ef1c42 | 2934 | static const struct inode_operations proc_task_inode_operations = { |
28a6d671 EB |
2935 | .lookup = proc_task_lookup, |
2936 | .getattr = proc_task_getattr, | |
2937 | .setattr = proc_setattr, | |
2938 | }; | |
2939 | ||
00977a59 | 2940 | static const struct file_operations proc_task_operations = { |
28a6d671 EB |
2941 | .read = generic_read_dir, |
2942 | .readdir = proc_task_readdir, | |
2943 | }; |