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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/fs/proc/base.c | |
3 | * | |
4 | * Copyright (C) 1991, 1992 Linus Torvalds | |
5 | * | |
6 | * proc base directory handling functions | |
7 | * | |
8 | * 1999, Al Viro. Rewritten. Now it covers the whole per-process part. | |
9 | * Instead of using magical inumbers to determine the kind of object | |
10 | * we allocate and fill in-core inodes upon lookup. They don't even | |
11 | * go into icache. We cache the reference to task_struct upon lookup too. | |
12 | * Eventually it should become a filesystem in its own. We don't use the | |
13 | * rest of procfs anymore. | |
e070ad49 ML |
14 | * |
15 | * | |
16 | * Changelog: | |
17 | * 17-Jan-2005 | |
18 | * Allan Bezerra | |
19 | * Bruna Moreira <bruna.moreira@indt.org.br> | |
20 | * Edjard Mota <edjard.mota@indt.org.br> | |
21 | * Ilias Biris <ilias.biris@indt.org.br> | |
22 | * Mauricio Lin <mauricio.lin@indt.org.br> | |
23 | * | |
24 | * Embedded Linux Lab - 10LE Instituto Nokia de Tecnologia - INdT | |
25 | * | |
26 | * A new process specific entry (smaps) included in /proc. It shows the | |
27 | * size of rss for each memory area. The maps entry lacks information | |
28 | * about physical memory size (rss) for each mapped file, i.e., | |
29 | * rss information for executables and library files. | |
30 | * This additional information is useful for any tools that need to know | |
31 | * about physical memory consumption for a process specific library. | |
32 | * | |
33 | * Changelog: | |
34 | * 21-Feb-2005 | |
35 | * Embedded Linux Lab - 10LE Instituto Nokia de Tecnologia - INdT | |
36 | * Pud inclusion in the page table walking. | |
37 | * | |
38 | * ChangeLog: | |
39 | * 10-Mar-2005 | |
40 | * 10LE Instituto Nokia de Tecnologia - INdT: | |
41 | * A better way to walks through the page table as suggested by Hugh Dickins. | |
42 | * | |
43 | * Simo Piiroinen <simo.piiroinen@nokia.com>: | |
44 | * Smaps information related to shared, private, clean and dirty pages. | |
45 | * | |
46 | * Paul Mundt <paul.mundt@nokia.com>: | |
47 | * Overall revision about smaps. | |
1da177e4 LT |
48 | */ |
49 | ||
7c0f6ba6 | 50 | #include <linux/uaccess.h> |
1da177e4 | 51 | |
1da177e4 LT |
52 | #include <linux/errno.h> |
53 | #include <linux/time.h> | |
54 | #include <linux/proc_fs.h> | |
55 | #include <linux/stat.h> | |
5995477a | 56 | #include <linux/task_io_accounting_ops.h> |
1da177e4 | 57 | #include <linux/init.h> |
16f7e0fe | 58 | #include <linux/capability.h> |
1da177e4 | 59 | #include <linux/file.h> |
9f3acc31 | 60 | #include <linux/fdtable.h> |
1da177e4 LT |
61 | #include <linux/string.h> |
62 | #include <linux/seq_file.h> | |
63 | #include <linux/namei.h> | |
6b3286ed | 64 | #include <linux/mnt_namespace.h> |
1da177e4 | 65 | #include <linux/mm.h> |
a63d83f4 | 66 | #include <linux/swap.h> |
b835996f | 67 | #include <linux/rcupdate.h> |
1da177e4 | 68 | #include <linux/kallsyms.h> |
2ec220e2 | 69 | #include <linux/stacktrace.h> |
d85f50d5 | 70 | #include <linux/resource.h> |
5096add8 | 71 | #include <linux/module.h> |
1da177e4 LT |
72 | #include <linux/mount.h> |
73 | #include <linux/security.h> | |
74 | #include <linux/ptrace.h> | |
0d094efe | 75 | #include <linux/tracehook.h> |
87ebdc00 | 76 | #include <linux/printk.h> |
a424316c | 77 | #include <linux/cgroup.h> |
1da177e4 LT |
78 | #include <linux/cpuset.h> |
79 | #include <linux/audit.h> | |
5addc5dd | 80 | #include <linux/poll.h> |
1651e14e | 81 | #include <linux/nsproxy.h> |
8ac773b4 | 82 | #include <linux/oom.h> |
3cb4a0bb | 83 | #include <linux/elf.h> |
60347f67 | 84 | #include <linux/pid_namespace.h> |
22d917d8 | 85 | #include <linux/user_namespace.h> |
5ad4e53b | 86 | #include <linux/fs_struct.h> |
5a0e3ad6 | 87 | #include <linux/slab.h> |
640708a2 | 88 | #include <linux/flex_array.h> |
48f6a7a5 | 89 | #include <linux/posix-timers.h> |
f133ecca CM |
90 | #ifdef CONFIG_HARDWALL |
91 | #include <asm/hardwall.h> | |
92 | #endif | |
43d2b113 | 93 | #include <trace/events/oom.h> |
1da177e4 | 94 | #include "internal.h" |
faf60af1 | 95 | #include "fd.h" |
1da177e4 | 96 | |
0f2fe20f EB |
97 | /* NOTE: |
98 | * Implementing inode permission operations in /proc is almost | |
99 | * certainly an error. Permission checks need to happen during | |
100 | * each system call not at open time. The reason is that most of | |
101 | * what we wish to check for permissions in /proc varies at runtime. | |
102 | * | |
103 | * The classic example of a problem is opening file descriptors | |
104 | * in /proc for a task before it execs a suid executable. | |
105 | */ | |
106 | ||
1270dd8d AD |
107 | static u8 nlink_tid; |
108 | static u8 nlink_tgid; | |
109 | ||
1da177e4 | 110 | struct pid_entry { |
cedbccab | 111 | const char *name; |
623f594e | 112 | unsigned int len; |
d161a13f | 113 | umode_t mode; |
c5ef1c42 | 114 | const struct inode_operations *iop; |
00977a59 | 115 | const struct file_operations *fop; |
20cdc894 | 116 | union proc_op op; |
1da177e4 LT |
117 | }; |
118 | ||
61a28784 | 119 | #define NOD(NAME, MODE, IOP, FOP, OP) { \ |
20cdc894 | 120 | .name = (NAME), \ |
c5141e6d | 121 | .len = sizeof(NAME) - 1, \ |
20cdc894 EB |
122 | .mode = MODE, \ |
123 | .iop = IOP, \ | |
124 | .fop = FOP, \ | |
125 | .op = OP, \ | |
126 | } | |
127 | ||
631f9c18 AD |
128 | #define DIR(NAME, MODE, iops, fops) \ |
129 | NOD(NAME, (S_IFDIR|(MODE)), &iops, &fops, {} ) | |
130 | #define LNK(NAME, get_link) \ | |
61a28784 | 131 | NOD(NAME, (S_IFLNK|S_IRWXUGO), \ |
20cdc894 | 132 | &proc_pid_link_inode_operations, NULL, \ |
631f9c18 AD |
133 | { .proc_get_link = get_link } ) |
134 | #define REG(NAME, MODE, fops) \ | |
135 | NOD(NAME, (S_IFREG|(MODE)), NULL, &fops, {}) | |
631f9c18 | 136 | #define ONE(NAME, MODE, show) \ |
be614086 EB |
137 | NOD(NAME, (S_IFREG|(MODE)), \ |
138 | NULL, &proc_single_file_operations, \ | |
631f9c18 | 139 | { .proc_show = show } ) |
1da177e4 | 140 | |
aed54175 VN |
141 | /* |
142 | * Count the number of hardlinks for the pid_entry table, excluding the . | |
143 | * and .. links. | |
144 | */ | |
1270dd8d | 145 | static unsigned int __init pid_entry_nlink(const struct pid_entry *entries, |
aed54175 VN |
146 | unsigned int n) |
147 | { | |
148 | unsigned int i; | |
149 | unsigned int count; | |
150 | ||
1270dd8d | 151 | count = 2; |
aed54175 VN |
152 | for (i = 0; i < n; ++i) { |
153 | if (S_ISDIR(entries[i].mode)) | |
154 | ++count; | |
155 | } | |
156 | ||
157 | return count; | |
158 | } | |
159 | ||
f7ad3c6b | 160 | static int get_task_root(struct task_struct *task, struct path *root) |
1da177e4 | 161 | { |
7c2c7d99 HD |
162 | int result = -ENOENT; |
163 | ||
0494f6ec | 164 | task_lock(task); |
f7ad3c6b MS |
165 | if (task->fs) { |
166 | get_fs_root(task->fs, root); | |
7c2c7d99 HD |
167 | result = 0; |
168 | } | |
0494f6ec | 169 | task_unlock(task); |
7c2c7d99 | 170 | return result; |
0494f6ec MS |
171 | } |
172 | ||
7773fbc5 | 173 | static int proc_cwd_link(struct dentry *dentry, struct path *path) |
0494f6ec | 174 | { |
2b0143b5 | 175 | struct task_struct *task = get_proc_task(d_inode(dentry)); |
0494f6ec | 176 | int result = -ENOENT; |
99f89551 EB |
177 | |
178 | if (task) { | |
f7ad3c6b MS |
179 | task_lock(task); |
180 | if (task->fs) { | |
181 | get_fs_pwd(task->fs, path); | |
182 | result = 0; | |
183 | } | |
184 | task_unlock(task); | |
99f89551 EB |
185 | put_task_struct(task); |
186 | } | |
1da177e4 LT |
187 | return result; |
188 | } | |
189 | ||
7773fbc5 | 190 | static int proc_root_link(struct dentry *dentry, struct path *path) |
1da177e4 | 191 | { |
2b0143b5 | 192 | struct task_struct *task = get_proc_task(d_inode(dentry)); |
1da177e4 | 193 | int result = -ENOENT; |
99f89551 EB |
194 | |
195 | if (task) { | |
f7ad3c6b | 196 | result = get_task_root(task, path); |
99f89551 EB |
197 | put_task_struct(task); |
198 | } | |
1da177e4 LT |
199 | return result; |
200 | } | |
201 | ||
c2c0bb44 AD |
202 | static ssize_t proc_pid_cmdline_read(struct file *file, char __user *buf, |
203 | size_t _count, loff_t *pos) | |
1da177e4 | 204 | { |
c2c0bb44 AD |
205 | struct task_struct *tsk; |
206 | struct mm_struct *mm; | |
207 | char *page; | |
208 | unsigned long count = _count; | |
209 | unsigned long arg_start, arg_end, env_start, env_end; | |
210 | unsigned long len1, len2, len; | |
211 | unsigned long p; | |
212 | char c; | |
213 | ssize_t rv; | |
214 | ||
215 | BUG_ON(*pos < 0); | |
216 | ||
217 | tsk = get_proc_task(file_inode(file)); | |
218 | if (!tsk) | |
219 | return -ESRCH; | |
220 | mm = get_task_mm(tsk); | |
221 | put_task_struct(tsk); | |
222 | if (!mm) | |
223 | return 0; | |
224 | /* Check if process spawned far enough to have cmdline. */ | |
225 | if (!mm->env_end) { | |
226 | rv = 0; | |
227 | goto out_mmput; | |
228 | } | |
229 | ||
230 | page = (char *)__get_free_page(GFP_TEMPORARY); | |
231 | if (!page) { | |
232 | rv = -ENOMEM; | |
233 | goto out_mmput; | |
234 | } | |
235 | ||
236 | down_read(&mm->mmap_sem); | |
237 | arg_start = mm->arg_start; | |
238 | arg_end = mm->arg_end; | |
239 | env_start = mm->env_start; | |
240 | env_end = mm->env_end; | |
241 | up_read(&mm->mmap_sem); | |
242 | ||
243 | BUG_ON(arg_start > arg_end); | |
244 | BUG_ON(env_start > env_end); | |
245 | ||
246 | len1 = arg_end - arg_start; | |
247 | len2 = env_end - env_start; | |
248 | ||
3581d458 AD |
249 | /* Empty ARGV. */ |
250 | if (len1 == 0) { | |
251 | rv = 0; | |
252 | goto out_free_page; | |
253 | } | |
2ca66ff7 | 254 | /* |
c2c0bb44 AD |
255 | * Inherently racy -- command line shares address space |
256 | * with code and data. | |
2ca66ff7 | 257 | */ |
272ddc8b | 258 | rv = access_remote_vm(mm, arg_end - 1, &c, 1, 0); |
c2c0bb44 AD |
259 | if (rv <= 0) |
260 | goto out_free_page; | |
261 | ||
262 | rv = 0; | |
263 | ||
264 | if (c == '\0') { | |
265 | /* Command line (set of strings) occupies whole ARGV. */ | |
266 | if (len1 <= *pos) | |
267 | goto out_free_page; | |
268 | ||
269 | p = arg_start + *pos; | |
270 | len = len1 - *pos; | |
271 | while (count > 0 && len > 0) { | |
272 | unsigned int _count; | |
273 | int nr_read; | |
274 | ||
275 | _count = min3(count, len, PAGE_SIZE); | |
272ddc8b | 276 | nr_read = access_remote_vm(mm, p, page, _count, 0); |
c2c0bb44 AD |
277 | if (nr_read < 0) |
278 | rv = nr_read; | |
279 | if (nr_read <= 0) | |
280 | goto out_free_page; | |
281 | ||
282 | if (copy_to_user(buf, page, nr_read)) { | |
283 | rv = -EFAULT; | |
284 | goto out_free_page; | |
285 | } | |
286 | ||
287 | p += nr_read; | |
288 | len -= nr_read; | |
289 | buf += nr_read; | |
290 | count -= nr_read; | |
291 | rv += nr_read; | |
292 | } | |
293 | } else { | |
294 | /* | |
295 | * Command line (1 string) occupies ARGV and maybe | |
296 | * extends into ENVP. | |
297 | */ | |
298 | if (len1 + len2 <= *pos) | |
299 | goto skip_argv_envp; | |
300 | if (len1 <= *pos) | |
301 | goto skip_argv; | |
302 | ||
303 | p = arg_start + *pos; | |
304 | len = len1 - *pos; | |
305 | while (count > 0 && len > 0) { | |
306 | unsigned int _count, l; | |
307 | int nr_read; | |
308 | bool final; | |
309 | ||
310 | _count = min3(count, len, PAGE_SIZE); | |
272ddc8b | 311 | nr_read = access_remote_vm(mm, p, page, _count, 0); |
c2c0bb44 AD |
312 | if (nr_read < 0) |
313 | rv = nr_read; | |
314 | if (nr_read <= 0) | |
315 | goto out_free_page; | |
316 | ||
317 | /* | |
318 | * Command line can be shorter than whole ARGV | |
319 | * even if last "marker" byte says it is not. | |
320 | */ | |
321 | final = false; | |
322 | l = strnlen(page, nr_read); | |
323 | if (l < nr_read) { | |
324 | nr_read = l; | |
325 | final = true; | |
326 | } | |
327 | ||
328 | if (copy_to_user(buf, page, nr_read)) { | |
329 | rv = -EFAULT; | |
330 | goto out_free_page; | |
331 | } | |
332 | ||
333 | p += nr_read; | |
334 | len -= nr_read; | |
335 | buf += nr_read; | |
336 | count -= nr_read; | |
337 | rv += nr_read; | |
338 | ||
339 | if (final) | |
340 | goto out_free_page; | |
341 | } | |
342 | skip_argv: | |
343 | /* | |
344 | * Command line (1 string) occupies ARGV and | |
345 | * extends into ENVP. | |
346 | */ | |
347 | if (len1 <= *pos) { | |
348 | p = env_start + *pos - len1; | |
349 | len = len1 + len2 - *pos; | |
350 | } else { | |
351 | p = env_start; | |
352 | len = len2; | |
353 | } | |
354 | while (count > 0 && len > 0) { | |
355 | unsigned int _count, l; | |
356 | int nr_read; | |
357 | bool final; | |
358 | ||
359 | _count = min3(count, len, PAGE_SIZE); | |
272ddc8b | 360 | nr_read = access_remote_vm(mm, p, page, _count, 0); |
c2c0bb44 AD |
361 | if (nr_read < 0) |
362 | rv = nr_read; | |
363 | if (nr_read <= 0) | |
364 | goto out_free_page; | |
365 | ||
366 | /* Find EOS. */ | |
367 | final = false; | |
368 | l = strnlen(page, nr_read); | |
369 | if (l < nr_read) { | |
370 | nr_read = l; | |
371 | final = true; | |
372 | } | |
373 | ||
374 | if (copy_to_user(buf, page, nr_read)) { | |
375 | rv = -EFAULT; | |
376 | goto out_free_page; | |
377 | } | |
378 | ||
379 | p += nr_read; | |
380 | len -= nr_read; | |
381 | buf += nr_read; | |
382 | count -= nr_read; | |
383 | rv += nr_read; | |
384 | ||
385 | if (final) | |
386 | goto out_free_page; | |
387 | } | |
388 | skip_argv_envp: | |
389 | ; | |
390 | } | |
391 | ||
392 | out_free_page: | |
393 | free_page((unsigned long)page); | |
394 | out_mmput: | |
395 | mmput(mm); | |
396 | if (rv > 0) | |
397 | *pos += rv; | |
398 | return rv; | |
1da177e4 LT |
399 | } |
400 | ||
c2c0bb44 AD |
401 | static const struct file_operations proc_pid_cmdline_ops = { |
402 | .read = proc_pid_cmdline_read, | |
403 | .llseek = generic_file_llseek, | |
404 | }; | |
405 | ||
1da177e4 LT |
406 | #ifdef CONFIG_KALLSYMS |
407 | /* | |
408 | * Provides a wchan file via kallsyms in a proper one-value-per-file format. | |
409 | * Returns the resolved symbol. If that fails, simply return the address. | |
410 | */ | |
edfcd606 AD |
411 | static int proc_pid_wchan(struct seq_file *m, struct pid_namespace *ns, |
412 | struct pid *pid, struct task_struct *task) | |
1da177e4 | 413 | { |
ffb45122 | 414 | unsigned long wchan; |
9281acea | 415 | char symname[KSYM_NAME_LEN]; |
1da177e4 LT |
416 | |
417 | wchan = get_wchan(task); | |
418 | ||
caaee623 JH |
419 | if (wchan && ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS) |
420 | && !lookup_symbol_name(wchan, symname)) | |
25ce3191 | 421 | seq_printf(m, "%s", symname); |
b2f73922 | 422 | else |
1e92a61c | 423 | seq_putc(m, '0'); |
25ce3191 JP |
424 | |
425 | return 0; | |
1da177e4 LT |
426 | } |
427 | #endif /* CONFIG_KALLSYMS */ | |
428 | ||
a9712bc1 AV |
429 | static int lock_trace(struct task_struct *task) |
430 | { | |
431 | int err = mutex_lock_killable(&task->signal->cred_guard_mutex); | |
432 | if (err) | |
433 | return err; | |
caaee623 | 434 | if (!ptrace_may_access(task, PTRACE_MODE_ATTACH_FSCREDS)) { |
a9712bc1 AV |
435 | mutex_unlock(&task->signal->cred_guard_mutex); |
436 | return -EPERM; | |
437 | } | |
438 | return 0; | |
439 | } | |
440 | ||
441 | static void unlock_trace(struct task_struct *task) | |
442 | { | |
443 | mutex_unlock(&task->signal->cred_guard_mutex); | |
444 | } | |
445 | ||
2ec220e2 KC |
446 | #ifdef CONFIG_STACKTRACE |
447 | ||
448 | #define MAX_STACK_TRACE_DEPTH 64 | |
449 | ||
450 | static int proc_pid_stack(struct seq_file *m, struct pid_namespace *ns, | |
451 | struct pid *pid, struct task_struct *task) | |
452 | { | |
453 | struct stack_trace trace; | |
454 | unsigned long *entries; | |
a9712bc1 | 455 | int err; |
2ec220e2 KC |
456 | int i; |
457 | ||
458 | entries = kmalloc(MAX_STACK_TRACE_DEPTH * sizeof(*entries), GFP_KERNEL); | |
459 | if (!entries) | |
460 | return -ENOMEM; | |
461 | ||
462 | trace.nr_entries = 0; | |
463 | trace.max_entries = MAX_STACK_TRACE_DEPTH; | |
464 | trace.entries = entries; | |
465 | trace.skip = 0; | |
2ec220e2 | 466 | |
a9712bc1 AV |
467 | err = lock_trace(task); |
468 | if (!err) { | |
469 | save_stack_trace_tsk(task, &trace); | |
470 | ||
471 | for (i = 0; i < trace.nr_entries; i++) { | |
8b927d73 | 472 | seq_printf(m, "[<%pK>] %pB\n", |
a9712bc1 AV |
473 | (void *)entries[i], (void *)entries[i]); |
474 | } | |
475 | unlock_trace(task); | |
2ec220e2 KC |
476 | } |
477 | kfree(entries); | |
478 | ||
a9712bc1 | 479 | return err; |
2ec220e2 KC |
480 | } |
481 | #endif | |
482 | ||
5968cece | 483 | #ifdef CONFIG_SCHED_INFO |
1da177e4 LT |
484 | /* |
485 | * Provides /proc/PID/schedstat | |
486 | */ | |
f6e826ca AD |
487 | static int proc_pid_schedstat(struct seq_file *m, struct pid_namespace *ns, |
488 | struct pid *pid, struct task_struct *task) | |
1da177e4 | 489 | { |
5968cece NR |
490 | if (unlikely(!sched_info_on())) |
491 | seq_printf(m, "0 0 0\n"); | |
492 | else | |
493 | seq_printf(m, "%llu %llu %lu\n", | |
25ce3191 JP |
494 | (unsigned long long)task->se.sum_exec_runtime, |
495 | (unsigned long long)task->sched_info.run_delay, | |
496 | task->sched_info.pcount); | |
497 | ||
498 | return 0; | |
1da177e4 LT |
499 | } |
500 | #endif | |
501 | ||
9745512c AV |
502 | #ifdef CONFIG_LATENCYTOP |
503 | static int lstats_show_proc(struct seq_file *m, void *v) | |
504 | { | |
505 | int i; | |
13d77c37 HS |
506 | struct inode *inode = m->private; |
507 | struct task_struct *task = get_proc_task(inode); | |
9745512c | 508 | |
13d77c37 HS |
509 | if (!task) |
510 | return -ESRCH; | |
511 | seq_puts(m, "Latency Top version : v0.1\n"); | |
9745512c | 512 | for (i = 0; i < 32; i++) { |
34e49d4f JP |
513 | struct latency_record *lr = &task->latency_record[i]; |
514 | if (lr->backtrace[0]) { | |
9745512c | 515 | int q; |
34e49d4f JP |
516 | seq_printf(m, "%i %li %li", |
517 | lr->count, lr->time, lr->max); | |
9745512c | 518 | for (q = 0; q < LT_BACKTRACEDEPTH; q++) { |
34e49d4f JP |
519 | unsigned long bt = lr->backtrace[q]; |
520 | if (!bt) | |
9745512c | 521 | break; |
34e49d4f | 522 | if (bt == ULONG_MAX) |
9745512c | 523 | break; |
34e49d4f | 524 | seq_printf(m, " %ps", (void *)bt); |
9745512c | 525 | } |
9d6de12f | 526 | seq_putc(m, '\n'); |
9745512c AV |
527 | } |
528 | ||
529 | } | |
13d77c37 | 530 | put_task_struct(task); |
9745512c AV |
531 | return 0; |
532 | } | |
533 | ||
534 | static int lstats_open(struct inode *inode, struct file *file) | |
535 | { | |
13d77c37 | 536 | return single_open(file, lstats_show_proc, inode); |
d6643d12 HS |
537 | } |
538 | ||
9745512c AV |
539 | static ssize_t lstats_write(struct file *file, const char __user *buf, |
540 | size_t count, loff_t *offs) | |
541 | { | |
496ad9aa | 542 | struct task_struct *task = get_proc_task(file_inode(file)); |
9745512c | 543 | |
13d77c37 HS |
544 | if (!task) |
545 | return -ESRCH; | |
9745512c | 546 | clear_all_latency_tracing(task); |
13d77c37 | 547 | put_task_struct(task); |
9745512c AV |
548 | |
549 | return count; | |
550 | } | |
551 | ||
552 | static const struct file_operations proc_lstats_operations = { | |
553 | .open = lstats_open, | |
554 | .read = seq_read, | |
555 | .write = lstats_write, | |
556 | .llseek = seq_lseek, | |
13d77c37 | 557 | .release = single_release, |
9745512c AV |
558 | }; |
559 | ||
560 | #endif | |
561 | ||
6ba51e37 AD |
562 | static int proc_oom_score(struct seq_file *m, struct pid_namespace *ns, |
563 | struct pid *pid, struct task_struct *task) | |
1da177e4 | 564 | { |
a7f638f9 | 565 | unsigned long totalpages = totalram_pages + total_swap_pages; |
b95c35e7 | 566 | unsigned long points = 0; |
1da177e4 | 567 | |
ef419398 ON |
568 | points = oom_badness(task, NULL, NULL, totalpages) * |
569 | 1000 / totalpages; | |
25ce3191 JP |
570 | seq_printf(m, "%lu\n", points); |
571 | ||
572 | return 0; | |
1da177e4 LT |
573 | } |
574 | ||
d85f50d5 | 575 | struct limit_names { |
cedbccab AD |
576 | const char *name; |
577 | const char *unit; | |
d85f50d5 NH |
578 | }; |
579 | ||
580 | static const struct limit_names lnames[RLIM_NLIMITS] = { | |
cff4edb5 | 581 | [RLIMIT_CPU] = {"Max cpu time", "seconds"}, |
d85f50d5 NH |
582 | [RLIMIT_FSIZE] = {"Max file size", "bytes"}, |
583 | [RLIMIT_DATA] = {"Max data size", "bytes"}, | |
584 | [RLIMIT_STACK] = {"Max stack size", "bytes"}, | |
585 | [RLIMIT_CORE] = {"Max core file size", "bytes"}, | |
586 | [RLIMIT_RSS] = {"Max resident set", "bytes"}, | |
587 | [RLIMIT_NPROC] = {"Max processes", "processes"}, | |
588 | [RLIMIT_NOFILE] = {"Max open files", "files"}, | |
589 | [RLIMIT_MEMLOCK] = {"Max locked memory", "bytes"}, | |
590 | [RLIMIT_AS] = {"Max address space", "bytes"}, | |
591 | [RLIMIT_LOCKS] = {"Max file locks", "locks"}, | |
592 | [RLIMIT_SIGPENDING] = {"Max pending signals", "signals"}, | |
593 | [RLIMIT_MSGQUEUE] = {"Max msgqueue size", "bytes"}, | |
594 | [RLIMIT_NICE] = {"Max nice priority", NULL}, | |
595 | [RLIMIT_RTPRIO] = {"Max realtime priority", NULL}, | |
8808117c | 596 | [RLIMIT_RTTIME] = {"Max realtime timeout", "us"}, |
d85f50d5 NH |
597 | }; |
598 | ||
599 | /* Display limits for a process */ | |
1c963eb1 AD |
600 | static int proc_pid_limits(struct seq_file *m, struct pid_namespace *ns, |
601 | struct pid *pid, struct task_struct *task) | |
d85f50d5 NH |
602 | { |
603 | unsigned int i; | |
d85f50d5 | 604 | unsigned long flags; |
d85f50d5 NH |
605 | |
606 | struct rlimit rlim[RLIM_NLIMITS]; | |
607 | ||
a6bebbc8 | 608 | if (!lock_task_sighand(task, &flags)) |
d85f50d5 | 609 | return 0; |
d85f50d5 NH |
610 | memcpy(rlim, task->signal->rlim, sizeof(struct rlimit) * RLIM_NLIMITS); |
611 | unlock_task_sighand(task, &flags); | |
d85f50d5 NH |
612 | |
613 | /* | |
614 | * print the file header | |
615 | */ | |
1c963eb1 | 616 | seq_printf(m, "%-25s %-20s %-20s %-10s\n", |
25ce3191 | 617 | "Limit", "Soft Limit", "Hard Limit", "Units"); |
d85f50d5 NH |
618 | |
619 | for (i = 0; i < RLIM_NLIMITS; i++) { | |
620 | if (rlim[i].rlim_cur == RLIM_INFINITY) | |
1c963eb1 | 621 | seq_printf(m, "%-25s %-20s ", |
25ce3191 | 622 | lnames[i].name, "unlimited"); |
d85f50d5 | 623 | else |
1c963eb1 | 624 | seq_printf(m, "%-25s %-20lu ", |
25ce3191 | 625 | lnames[i].name, rlim[i].rlim_cur); |
d85f50d5 NH |
626 | |
627 | if (rlim[i].rlim_max == RLIM_INFINITY) | |
1c963eb1 | 628 | seq_printf(m, "%-20s ", "unlimited"); |
d85f50d5 | 629 | else |
1c963eb1 | 630 | seq_printf(m, "%-20lu ", rlim[i].rlim_max); |
d85f50d5 NH |
631 | |
632 | if (lnames[i].unit) | |
1c963eb1 | 633 | seq_printf(m, "%-10s\n", lnames[i].unit); |
d85f50d5 | 634 | else |
1c963eb1 | 635 | seq_putc(m, '\n'); |
d85f50d5 NH |
636 | } |
637 | ||
1c963eb1 | 638 | return 0; |
d85f50d5 NH |
639 | } |
640 | ||
ebcb6734 | 641 | #ifdef CONFIG_HAVE_ARCH_TRACEHOOK |
09d93bd6 AD |
642 | static int proc_pid_syscall(struct seq_file *m, struct pid_namespace *ns, |
643 | struct pid *pid, struct task_struct *task) | |
ebcb6734 RM |
644 | { |
645 | long nr; | |
646 | unsigned long args[6], sp, pc; | |
25ce3191 JP |
647 | int res; |
648 | ||
649 | res = lock_trace(task); | |
a9712bc1 AV |
650 | if (res) |
651 | return res; | |
ebcb6734 RM |
652 | |
653 | if (task_current_syscall(task, &nr, args, 6, &sp, &pc)) | |
09d93bd6 | 654 | seq_puts(m, "running\n"); |
a9712bc1 | 655 | else if (nr < 0) |
09d93bd6 | 656 | seq_printf(m, "%ld 0x%lx 0x%lx\n", nr, sp, pc); |
a9712bc1 | 657 | else |
09d93bd6 | 658 | seq_printf(m, |
ebcb6734 RM |
659 | "%ld 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx\n", |
660 | nr, | |
661 | args[0], args[1], args[2], args[3], args[4], args[5], | |
662 | sp, pc); | |
a9712bc1 | 663 | unlock_trace(task); |
25ce3191 JP |
664 | |
665 | return 0; | |
ebcb6734 RM |
666 | } |
667 | #endif /* CONFIG_HAVE_ARCH_TRACEHOOK */ | |
668 | ||
1da177e4 LT |
669 | /************************************************************************/ |
670 | /* Here the fs part begins */ | |
671 | /************************************************************************/ | |
672 | ||
673 | /* permission checks */ | |
778c1144 | 674 | static int proc_fd_access_allowed(struct inode *inode) |
1da177e4 | 675 | { |
778c1144 EB |
676 | struct task_struct *task; |
677 | int allowed = 0; | |
df26c40e EB |
678 | /* Allow access to a task's file descriptors if it is us or we |
679 | * may use ptrace attach to the process and find out that | |
680 | * information. | |
778c1144 EB |
681 | */ |
682 | task = get_proc_task(inode); | |
df26c40e | 683 | if (task) { |
caaee623 | 684 | allowed = ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS); |
778c1144 | 685 | put_task_struct(task); |
df26c40e | 686 | } |
778c1144 | 687 | return allowed; |
1da177e4 LT |
688 | } |
689 | ||
6b4e306a | 690 | int proc_setattr(struct dentry *dentry, struct iattr *attr) |
6d76fa58 LT |
691 | { |
692 | int error; | |
2b0143b5 | 693 | struct inode *inode = d_inode(dentry); |
6d76fa58 LT |
694 | |
695 | if (attr->ia_valid & ATTR_MODE) | |
696 | return -EPERM; | |
697 | ||
31051c85 | 698 | error = setattr_prepare(dentry, attr); |
1025774c CH |
699 | if (error) |
700 | return error; | |
701 | ||
1025774c CH |
702 | setattr_copy(inode, attr); |
703 | mark_inode_dirty(inode); | |
704 | return 0; | |
6d76fa58 LT |
705 | } |
706 | ||
0499680a VK |
707 | /* |
708 | * May current process learn task's sched/cmdline info (for hide_pid_min=1) | |
709 | * or euid/egid (for hide_pid_min=2)? | |
710 | */ | |
711 | static bool has_pid_permissions(struct pid_namespace *pid, | |
712 | struct task_struct *task, | |
713 | int hide_pid_min) | |
714 | { | |
715 | if (pid->hide_pid < hide_pid_min) | |
716 | return true; | |
717 | if (in_group_p(pid->pid_gid)) | |
718 | return true; | |
caaee623 | 719 | return ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS); |
0499680a VK |
720 | } |
721 | ||
722 | ||
723 | static int proc_pid_permission(struct inode *inode, int mask) | |
724 | { | |
725 | struct pid_namespace *pid = inode->i_sb->s_fs_info; | |
726 | struct task_struct *task; | |
727 | bool has_perms; | |
728 | ||
729 | task = get_proc_task(inode); | |
a2ef990a XF |
730 | if (!task) |
731 | return -ESRCH; | |
0499680a VK |
732 | has_perms = has_pid_permissions(pid, task, 1); |
733 | put_task_struct(task); | |
734 | ||
735 | if (!has_perms) { | |
736 | if (pid->hide_pid == 2) { | |
737 | /* | |
738 | * Let's make getdents(), stat(), and open() | |
739 | * consistent with each other. If a process | |
740 | * may not stat() a file, it shouldn't be seen | |
741 | * in procfs at all. | |
742 | */ | |
743 | return -ENOENT; | |
744 | } | |
745 | ||
746 | return -EPERM; | |
747 | } | |
748 | return generic_permission(inode, mask); | |
749 | } | |
750 | ||
751 | ||
752 | ||
c5ef1c42 | 753 | static const struct inode_operations proc_def_inode_operations = { |
6d76fa58 LT |
754 | .setattr = proc_setattr, |
755 | }; | |
756 | ||
be614086 EB |
757 | static int proc_single_show(struct seq_file *m, void *v) |
758 | { | |
759 | struct inode *inode = m->private; | |
760 | struct pid_namespace *ns; | |
761 | struct pid *pid; | |
762 | struct task_struct *task; | |
763 | int ret; | |
764 | ||
765 | ns = inode->i_sb->s_fs_info; | |
766 | pid = proc_pid(inode); | |
767 | task = get_pid_task(pid, PIDTYPE_PID); | |
768 | if (!task) | |
769 | return -ESRCH; | |
770 | ||
771 | ret = PROC_I(inode)->op.proc_show(m, ns, pid, task); | |
772 | ||
773 | put_task_struct(task); | |
774 | return ret; | |
775 | } | |
776 | ||
777 | static int proc_single_open(struct inode *inode, struct file *filp) | |
778 | { | |
c6a34058 | 779 | return single_open(filp, proc_single_show, inode); |
be614086 EB |
780 | } |
781 | ||
782 | static const struct file_operations proc_single_file_operations = { | |
783 | .open = proc_single_open, | |
784 | .read = seq_read, | |
785 | .llseek = seq_lseek, | |
786 | .release = single_release, | |
787 | }; | |
788 | ||
5381e169 ON |
789 | |
790 | struct mm_struct *proc_mem_open(struct inode *inode, unsigned int mode) | |
1da177e4 | 791 | { |
5381e169 ON |
792 | struct task_struct *task = get_proc_task(inode); |
793 | struct mm_struct *mm = ERR_PTR(-ESRCH); | |
e268337d | 794 | |
5381e169 | 795 | if (task) { |
caaee623 | 796 | mm = mm_access(task, mode | PTRACE_MODE_FSCREDS); |
5381e169 | 797 | put_task_struct(task); |
e268337d | 798 | |
5381e169 ON |
799 | if (!IS_ERR_OR_NULL(mm)) { |
800 | /* ensure this mm_struct can't be freed */ | |
801 | atomic_inc(&mm->mm_count); | |
802 | /* but do not pin its memory */ | |
803 | mmput(mm); | |
804 | } | |
805 | } | |
806 | ||
807 | return mm; | |
808 | } | |
809 | ||
810 | static int __mem_open(struct inode *inode, struct file *file, unsigned int mode) | |
811 | { | |
812 | struct mm_struct *mm = proc_mem_open(inode, mode); | |
e268337d LT |
813 | |
814 | if (IS_ERR(mm)) | |
815 | return PTR_ERR(mm); | |
816 | ||
e268337d | 817 | file->private_data = mm; |
1da177e4 LT |
818 | return 0; |
819 | } | |
820 | ||
b409e578 CW |
821 | static int mem_open(struct inode *inode, struct file *file) |
822 | { | |
bc452b4b DH |
823 | int ret = __mem_open(inode, file, PTRACE_MODE_ATTACH); |
824 | ||
825 | /* OK to pass negative loff_t, we can catch out-of-range */ | |
826 | file->f_mode |= FMODE_UNSIGNED_OFFSET; | |
827 | ||
828 | return ret; | |
b409e578 CW |
829 | } |
830 | ||
572d34b9 ON |
831 | static ssize_t mem_rw(struct file *file, char __user *buf, |
832 | size_t count, loff_t *ppos, int write) | |
1da177e4 | 833 | { |
e268337d | 834 | struct mm_struct *mm = file->private_data; |
572d34b9 ON |
835 | unsigned long addr = *ppos; |
836 | ssize_t copied; | |
1da177e4 | 837 | char *page; |
272ddc8b | 838 | unsigned int flags; |
1da177e4 | 839 | |
e268337d LT |
840 | if (!mm) |
841 | return 0; | |
99f89551 | 842 | |
30cd8903 KM |
843 | page = (char *)__get_free_page(GFP_TEMPORARY); |
844 | if (!page) | |
e268337d | 845 | return -ENOMEM; |
1da177e4 | 846 | |
f7ca54f4 | 847 | copied = 0; |
6d08f2c7 ON |
848 | if (!atomic_inc_not_zero(&mm->mm_users)) |
849 | goto free; | |
850 | ||
272ddc8b LT |
851 | /* Maybe we should limit FOLL_FORCE to actual ptrace users? */ |
852 | flags = FOLL_FORCE; | |
6347e8d5 LS |
853 | if (write) |
854 | flags |= FOLL_WRITE; | |
855 | ||
1da177e4 | 856 | while (count > 0) { |
572d34b9 | 857 | int this_len = min_t(int, count, PAGE_SIZE); |
1da177e4 | 858 | |
572d34b9 | 859 | if (write && copy_from_user(page, buf, this_len)) { |
1da177e4 LT |
860 | copied = -EFAULT; |
861 | break; | |
862 | } | |
572d34b9 | 863 | |
6347e8d5 | 864 | this_len = access_remote_vm(mm, addr, page, this_len, flags); |
572d34b9 | 865 | if (!this_len) { |
1da177e4 LT |
866 | if (!copied) |
867 | copied = -EIO; | |
868 | break; | |
869 | } | |
572d34b9 ON |
870 | |
871 | if (!write && copy_to_user(buf, page, this_len)) { | |
872 | copied = -EFAULT; | |
873 | break; | |
874 | } | |
875 | ||
876 | buf += this_len; | |
877 | addr += this_len; | |
878 | copied += this_len; | |
879 | count -= this_len; | |
1da177e4 | 880 | } |
572d34b9 | 881 | *ppos = addr; |
30cd8903 | 882 | |
6d08f2c7 ON |
883 | mmput(mm); |
884 | free: | |
30cd8903 | 885 | free_page((unsigned long) page); |
1da177e4 LT |
886 | return copied; |
887 | } | |
1da177e4 | 888 | |
572d34b9 ON |
889 | static ssize_t mem_read(struct file *file, char __user *buf, |
890 | size_t count, loff_t *ppos) | |
891 | { | |
892 | return mem_rw(file, buf, count, ppos, 0); | |
893 | } | |
894 | ||
895 | static ssize_t mem_write(struct file *file, const char __user *buf, | |
896 | size_t count, loff_t *ppos) | |
897 | { | |
898 | return mem_rw(file, (char __user*)buf, count, ppos, 1); | |
899 | } | |
900 | ||
85863e47 | 901 | loff_t mem_lseek(struct file *file, loff_t offset, int orig) |
1da177e4 LT |
902 | { |
903 | switch (orig) { | |
904 | case 0: | |
905 | file->f_pos = offset; | |
906 | break; | |
907 | case 1: | |
908 | file->f_pos += offset; | |
909 | break; | |
910 | default: | |
911 | return -EINVAL; | |
912 | } | |
913 | force_successful_syscall_return(); | |
914 | return file->f_pos; | |
915 | } | |
916 | ||
e268337d LT |
917 | static int mem_release(struct inode *inode, struct file *file) |
918 | { | |
919 | struct mm_struct *mm = file->private_data; | |
71879d3c | 920 | if (mm) |
6d08f2c7 | 921 | mmdrop(mm); |
e268337d LT |
922 | return 0; |
923 | } | |
924 | ||
00977a59 | 925 | static const struct file_operations proc_mem_operations = { |
1da177e4 LT |
926 | .llseek = mem_lseek, |
927 | .read = mem_read, | |
928 | .write = mem_write, | |
929 | .open = mem_open, | |
e268337d | 930 | .release = mem_release, |
1da177e4 LT |
931 | }; |
932 | ||
b409e578 CW |
933 | static int environ_open(struct inode *inode, struct file *file) |
934 | { | |
935 | return __mem_open(inode, file, PTRACE_MODE_READ); | |
936 | } | |
937 | ||
315e28c8 JP |
938 | static ssize_t environ_read(struct file *file, char __user *buf, |
939 | size_t count, loff_t *ppos) | |
940 | { | |
315e28c8 JP |
941 | char *page; |
942 | unsigned long src = *ppos; | |
b409e578 CW |
943 | int ret = 0; |
944 | struct mm_struct *mm = file->private_data; | |
a3b609ef | 945 | unsigned long env_start, env_end; |
315e28c8 | 946 | |
8148a73c MK |
947 | /* Ensure the process spawned far enough to have an environment. */ |
948 | if (!mm || !mm->env_end) | |
b409e578 | 949 | return 0; |
315e28c8 | 950 | |
315e28c8 JP |
951 | page = (char *)__get_free_page(GFP_TEMPORARY); |
952 | if (!page) | |
b409e578 | 953 | return -ENOMEM; |
315e28c8 | 954 | |
d6f64b89 | 955 | ret = 0; |
b409e578 CW |
956 | if (!atomic_inc_not_zero(&mm->mm_users)) |
957 | goto free; | |
a3b609ef MG |
958 | |
959 | down_read(&mm->mmap_sem); | |
960 | env_start = mm->env_start; | |
961 | env_end = mm->env_end; | |
962 | up_read(&mm->mmap_sem); | |
963 | ||
315e28c8 | 964 | while (count > 0) { |
e8905ec2 DH |
965 | size_t this_len, max_len; |
966 | int retval; | |
315e28c8 | 967 | |
a3b609ef | 968 | if (src >= (env_end - env_start)) |
315e28c8 JP |
969 | break; |
970 | ||
a3b609ef | 971 | this_len = env_end - (env_start + src); |
e8905ec2 DH |
972 | |
973 | max_len = min_t(size_t, PAGE_SIZE, count); | |
974 | this_len = min(max_len, this_len); | |
315e28c8 | 975 | |
272ddc8b | 976 | retval = access_remote_vm(mm, (env_start + src), page, this_len, 0); |
315e28c8 JP |
977 | |
978 | if (retval <= 0) { | |
979 | ret = retval; | |
980 | break; | |
981 | } | |
982 | ||
983 | if (copy_to_user(buf, page, retval)) { | |
984 | ret = -EFAULT; | |
985 | break; | |
986 | } | |
987 | ||
988 | ret += retval; | |
989 | src += retval; | |
990 | buf += retval; | |
991 | count -= retval; | |
992 | } | |
993 | *ppos = src; | |
315e28c8 | 994 | mmput(mm); |
b409e578 CW |
995 | |
996 | free: | |
315e28c8 | 997 | free_page((unsigned long) page); |
315e28c8 JP |
998 | return ret; |
999 | } | |
1000 | ||
1001 | static const struct file_operations proc_environ_operations = { | |
b409e578 | 1002 | .open = environ_open, |
315e28c8 | 1003 | .read = environ_read, |
87df8424 | 1004 | .llseek = generic_file_llseek, |
b409e578 | 1005 | .release = mem_release, |
315e28c8 JP |
1006 | }; |
1007 | ||
c5317167 AV |
1008 | static int auxv_open(struct inode *inode, struct file *file) |
1009 | { | |
1010 | return __mem_open(inode, file, PTRACE_MODE_READ_FSCREDS); | |
1011 | } | |
1012 | ||
1013 | static ssize_t auxv_read(struct file *file, char __user *buf, | |
1014 | size_t count, loff_t *ppos) | |
1015 | { | |
1016 | struct mm_struct *mm = file->private_data; | |
1017 | unsigned int nwords = 0; | |
06b2849d LY |
1018 | |
1019 | if (!mm) | |
1020 | return 0; | |
c5317167 AV |
1021 | do { |
1022 | nwords += 2; | |
1023 | } while (mm->saved_auxv[nwords - 2] != 0); /* AT_NULL */ | |
1024 | return simple_read_from_buffer(buf, count, ppos, mm->saved_auxv, | |
1025 | nwords * sizeof(mm->saved_auxv[0])); | |
1026 | } | |
1027 | ||
1028 | static const struct file_operations proc_auxv_operations = { | |
1029 | .open = auxv_open, | |
1030 | .read = auxv_read, | |
1031 | .llseek = generic_file_llseek, | |
1032 | .release = mem_release, | |
1033 | }; | |
1034 | ||
fa0cbbf1 DR |
1035 | static ssize_t oom_adj_read(struct file *file, char __user *buf, size_t count, |
1036 | loff_t *ppos) | |
1037 | { | |
496ad9aa | 1038 | struct task_struct *task = get_proc_task(file_inode(file)); |
fa0cbbf1 DR |
1039 | char buffer[PROC_NUMBUF]; |
1040 | int oom_adj = OOM_ADJUST_MIN; | |
1041 | size_t len; | |
fa0cbbf1 DR |
1042 | |
1043 | if (!task) | |
1044 | return -ESRCH; | |
f913da59 MH |
1045 | if (task->signal->oom_score_adj == OOM_SCORE_ADJ_MAX) |
1046 | oom_adj = OOM_ADJUST_MAX; | |
1047 | else | |
1048 | oom_adj = (task->signal->oom_score_adj * -OOM_DISABLE) / | |
1049 | OOM_SCORE_ADJ_MAX; | |
fa0cbbf1 DR |
1050 | put_task_struct(task); |
1051 | len = snprintf(buffer, sizeof(buffer), "%d\n", oom_adj); | |
1052 | return simple_read_from_buffer(buf, count, ppos, buffer, len); | |
1053 | } | |
1054 | ||
1d5f0acb MH |
1055 | static int __set_oom_adj(struct file *file, int oom_adj, bool legacy) |
1056 | { | |
1057 | static DEFINE_MUTEX(oom_adj_mutex); | |
44a70ade | 1058 | struct mm_struct *mm = NULL; |
1d5f0acb MH |
1059 | struct task_struct *task; |
1060 | int err = 0; | |
1061 | ||
1062 | task = get_proc_task(file_inode(file)); | |
1063 | if (!task) | |
1064 | return -ESRCH; | |
1065 | ||
1066 | mutex_lock(&oom_adj_mutex); | |
1067 | if (legacy) { | |
1068 | if (oom_adj < task->signal->oom_score_adj && | |
1069 | !capable(CAP_SYS_RESOURCE)) { | |
1070 | err = -EACCES; | |
1071 | goto err_unlock; | |
1072 | } | |
1073 | /* | |
1074 | * /proc/pid/oom_adj is provided for legacy purposes, ask users to use | |
1075 | * /proc/pid/oom_score_adj instead. | |
1076 | */ | |
1077 | pr_warn_once("%s (%d): /proc/%d/oom_adj is deprecated, please use /proc/%d/oom_score_adj instead.\n", | |
1078 | current->comm, task_pid_nr(current), task_pid_nr(task), | |
1079 | task_pid_nr(task)); | |
1080 | } else { | |
1081 | if ((short)oom_adj < task->signal->oom_score_adj_min && | |
1082 | !capable(CAP_SYS_RESOURCE)) { | |
1083 | err = -EACCES; | |
1084 | goto err_unlock; | |
1085 | } | |
1086 | } | |
1087 | ||
44a70ade MH |
1088 | /* |
1089 | * Make sure we will check other processes sharing the mm if this is | |
1090 | * not vfrok which wants its own oom_score_adj. | |
1091 | * pin the mm so it doesn't go away and get reused after task_unlock | |
1092 | */ | |
1093 | if (!task->vfork_done) { | |
1094 | struct task_struct *p = find_lock_task_mm(task); | |
1095 | ||
1096 | if (p) { | |
1097 | if (atomic_read(&p->mm->mm_users) > 1) { | |
1098 | mm = p->mm; | |
1099 | atomic_inc(&mm->mm_count); | |
1100 | } | |
1101 | task_unlock(p); | |
1102 | } | |
1103 | } | |
1104 | ||
1d5f0acb MH |
1105 | task->signal->oom_score_adj = oom_adj; |
1106 | if (!legacy && has_capability_noaudit(current, CAP_SYS_RESOURCE)) | |
1107 | task->signal->oom_score_adj_min = (short)oom_adj; | |
1108 | trace_oom_score_adj_update(task); | |
44a70ade MH |
1109 | |
1110 | if (mm) { | |
1111 | struct task_struct *p; | |
1112 | ||
1113 | rcu_read_lock(); | |
1114 | for_each_process(p) { | |
1115 | if (same_thread_group(task, p)) | |
1116 | continue; | |
1117 | ||
1118 | /* do not touch kernel threads or the global init */ | |
1119 | if (p->flags & PF_KTHREAD || is_global_init(p)) | |
1120 | continue; | |
1121 | ||
1122 | task_lock(p); | |
1123 | if (!p->vfork_done && process_shares_mm(p, mm)) { | |
1124 | pr_info("updating oom_score_adj for %d (%s) from %d to %d because it shares mm with %d (%s). Report if this is unexpected.\n", | |
1125 | task_pid_nr(p), p->comm, | |
1126 | p->signal->oom_score_adj, oom_adj, | |
1127 | task_pid_nr(task), task->comm); | |
1128 | p->signal->oom_score_adj = oom_adj; | |
1129 | if (!legacy && has_capability_noaudit(current, CAP_SYS_RESOURCE)) | |
1130 | p->signal->oom_score_adj_min = (short)oom_adj; | |
1131 | } | |
1132 | task_unlock(p); | |
1133 | } | |
1134 | rcu_read_unlock(); | |
1135 | mmdrop(mm); | |
1136 | } | |
1d5f0acb MH |
1137 | err_unlock: |
1138 | mutex_unlock(&oom_adj_mutex); | |
1139 | put_task_struct(task); | |
1140 | return err; | |
1141 | } | |
f913da59 | 1142 | |
b72bdfa7 DR |
1143 | /* |
1144 | * /proc/pid/oom_adj exists solely for backwards compatibility with previous | |
1145 | * kernels. The effective policy is defined by oom_score_adj, which has a | |
1146 | * different scale: oom_adj grew exponentially and oom_score_adj grows linearly. | |
1147 | * Values written to oom_adj are simply mapped linearly to oom_score_adj. | |
1148 | * Processes that become oom disabled via oom_adj will still be oom disabled | |
1149 | * with this implementation. | |
1150 | * | |
1151 | * oom_adj cannot be removed since existing userspace binaries use it. | |
1152 | */ | |
fa0cbbf1 DR |
1153 | static ssize_t oom_adj_write(struct file *file, const char __user *buf, |
1154 | size_t count, loff_t *ppos) | |
1155 | { | |
fa0cbbf1 DR |
1156 | char buffer[PROC_NUMBUF]; |
1157 | int oom_adj; | |
fa0cbbf1 DR |
1158 | int err; |
1159 | ||
1160 | memset(buffer, 0, sizeof(buffer)); | |
1161 | if (count > sizeof(buffer) - 1) | |
1162 | count = sizeof(buffer) - 1; | |
1163 | if (copy_from_user(buffer, buf, count)) { | |
1164 | err = -EFAULT; | |
1165 | goto out; | |
1166 | } | |
1167 | ||
1168 | err = kstrtoint(strstrip(buffer), 0, &oom_adj); | |
1169 | if (err) | |
1170 | goto out; | |
1171 | if ((oom_adj < OOM_ADJUST_MIN || oom_adj > OOM_ADJUST_MAX) && | |
1172 | oom_adj != OOM_DISABLE) { | |
1173 | err = -EINVAL; | |
1174 | goto out; | |
1175 | } | |
1176 | ||
fa0cbbf1 DR |
1177 | /* |
1178 | * Scale /proc/pid/oom_score_adj appropriately ensuring that a maximum | |
1179 | * value is always attainable. | |
1180 | */ | |
1181 | if (oom_adj == OOM_ADJUST_MAX) | |
1182 | oom_adj = OOM_SCORE_ADJ_MAX; | |
1183 | else | |
1184 | oom_adj = (oom_adj * OOM_SCORE_ADJ_MAX) / -OOM_DISABLE; | |
1185 | ||
1d5f0acb | 1186 | err = __set_oom_adj(file, oom_adj, true); |
fa0cbbf1 DR |
1187 | out: |
1188 | return err < 0 ? err : count; | |
1189 | } | |
1190 | ||
1191 | static const struct file_operations proc_oom_adj_operations = { | |
1192 | .read = oom_adj_read, | |
1193 | .write = oom_adj_write, | |
1194 | .llseek = generic_file_llseek, | |
1195 | }; | |
1196 | ||
a63d83f4 DR |
1197 | static ssize_t oom_score_adj_read(struct file *file, char __user *buf, |
1198 | size_t count, loff_t *ppos) | |
1199 | { | |
496ad9aa | 1200 | struct task_struct *task = get_proc_task(file_inode(file)); |
a63d83f4 | 1201 | char buffer[PROC_NUMBUF]; |
a9c58b90 | 1202 | short oom_score_adj = OOM_SCORE_ADJ_MIN; |
a63d83f4 DR |
1203 | size_t len; |
1204 | ||
1205 | if (!task) | |
1206 | return -ESRCH; | |
f913da59 | 1207 | oom_score_adj = task->signal->oom_score_adj; |
a63d83f4 | 1208 | put_task_struct(task); |
a9c58b90 | 1209 | len = snprintf(buffer, sizeof(buffer), "%hd\n", oom_score_adj); |
a63d83f4 DR |
1210 | return simple_read_from_buffer(buf, count, ppos, buffer, len); |
1211 | } | |
1212 | ||
1213 | static ssize_t oom_score_adj_write(struct file *file, const char __user *buf, | |
1214 | size_t count, loff_t *ppos) | |
1215 | { | |
a63d83f4 | 1216 | char buffer[PROC_NUMBUF]; |
0a8cb8e3 | 1217 | int oom_score_adj; |
a63d83f4 DR |
1218 | int err; |
1219 | ||
1220 | memset(buffer, 0, sizeof(buffer)); | |
1221 | if (count > sizeof(buffer) - 1) | |
1222 | count = sizeof(buffer) - 1; | |
723548bf DR |
1223 | if (copy_from_user(buffer, buf, count)) { |
1224 | err = -EFAULT; | |
1225 | goto out; | |
1226 | } | |
a63d83f4 | 1227 | |
0a8cb8e3 | 1228 | err = kstrtoint(strstrip(buffer), 0, &oom_score_adj); |
a63d83f4 | 1229 | if (err) |
723548bf | 1230 | goto out; |
a63d83f4 | 1231 | if (oom_score_adj < OOM_SCORE_ADJ_MIN || |
723548bf DR |
1232 | oom_score_adj > OOM_SCORE_ADJ_MAX) { |
1233 | err = -EINVAL; | |
1234 | goto out; | |
1235 | } | |
a63d83f4 | 1236 | |
1d5f0acb | 1237 | err = __set_oom_adj(file, oom_score_adj, false); |
723548bf DR |
1238 | out: |
1239 | return err < 0 ? err : count; | |
a63d83f4 DR |
1240 | } |
1241 | ||
1242 | static const struct file_operations proc_oom_score_adj_operations = { | |
1243 | .read = oom_score_adj_read, | |
1244 | .write = oom_score_adj_write, | |
6038f373 | 1245 | .llseek = default_llseek, |
a63d83f4 DR |
1246 | }; |
1247 | ||
1da177e4 | 1248 | #ifdef CONFIG_AUDITSYSCALL |
b4eb4f7f | 1249 | #define TMPBUFLEN 11 |
1da177e4 LT |
1250 | static ssize_t proc_loginuid_read(struct file * file, char __user * buf, |
1251 | size_t count, loff_t *ppos) | |
1252 | { | |
496ad9aa | 1253 | struct inode * inode = file_inode(file); |
99f89551 | 1254 | struct task_struct *task = get_proc_task(inode); |
1da177e4 LT |
1255 | ssize_t length; |
1256 | char tmpbuf[TMPBUFLEN]; | |
1257 | ||
99f89551 EB |
1258 | if (!task) |
1259 | return -ESRCH; | |
1da177e4 | 1260 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", |
e1760bd5 EB |
1261 | from_kuid(file->f_cred->user_ns, |
1262 | audit_get_loginuid(task))); | |
99f89551 | 1263 | put_task_struct(task); |
1da177e4 LT |
1264 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); |
1265 | } | |
1266 | ||
1267 | static ssize_t proc_loginuid_write(struct file * file, const char __user * buf, | |
1268 | size_t count, loff_t *ppos) | |
1269 | { | |
496ad9aa | 1270 | struct inode * inode = file_inode(file); |
1da177e4 | 1271 | uid_t loginuid; |
e1760bd5 | 1272 | kuid_t kloginuid; |
774636e1 | 1273 | int rv; |
1da177e4 | 1274 | |
7dc52157 PM |
1275 | rcu_read_lock(); |
1276 | if (current != pid_task(proc_pid(inode), PIDTYPE_PID)) { | |
1277 | rcu_read_unlock(); | |
1da177e4 | 1278 | return -EPERM; |
7dc52157 PM |
1279 | } |
1280 | rcu_read_unlock(); | |
1da177e4 | 1281 | |
1da177e4 LT |
1282 | if (*ppos != 0) { |
1283 | /* No partial writes. */ | |
1284 | return -EINVAL; | |
1285 | } | |
1da177e4 | 1286 | |
774636e1 AD |
1287 | rv = kstrtou32_from_user(buf, count, 10, &loginuid); |
1288 | if (rv < 0) | |
1289 | return rv; | |
81407c84 EP |
1290 | |
1291 | /* is userspace tring to explicitly UNSET the loginuid? */ | |
1292 | if (loginuid == AUDIT_UID_UNSET) { | |
1293 | kloginuid = INVALID_UID; | |
1294 | } else { | |
1295 | kloginuid = make_kuid(file->f_cred->user_ns, loginuid); | |
774636e1 AD |
1296 | if (!uid_valid(kloginuid)) |
1297 | return -EINVAL; | |
e1760bd5 EB |
1298 | } |
1299 | ||
774636e1 AD |
1300 | rv = audit_set_loginuid(kloginuid); |
1301 | if (rv < 0) | |
1302 | return rv; | |
1303 | return count; | |
1da177e4 LT |
1304 | } |
1305 | ||
00977a59 | 1306 | static const struct file_operations proc_loginuid_operations = { |
1da177e4 LT |
1307 | .read = proc_loginuid_read, |
1308 | .write = proc_loginuid_write, | |
87df8424 | 1309 | .llseek = generic_file_llseek, |
1da177e4 | 1310 | }; |
1e0bd755 EP |
1311 | |
1312 | static ssize_t proc_sessionid_read(struct file * file, char __user * buf, | |
1313 | size_t count, loff_t *ppos) | |
1314 | { | |
496ad9aa | 1315 | struct inode * inode = file_inode(file); |
1e0bd755 EP |
1316 | struct task_struct *task = get_proc_task(inode); |
1317 | ssize_t length; | |
1318 | char tmpbuf[TMPBUFLEN]; | |
1319 | ||
1320 | if (!task) | |
1321 | return -ESRCH; | |
1322 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", | |
1323 | audit_get_sessionid(task)); | |
1324 | put_task_struct(task); | |
1325 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
1326 | } | |
1327 | ||
1328 | static const struct file_operations proc_sessionid_operations = { | |
1329 | .read = proc_sessionid_read, | |
87df8424 | 1330 | .llseek = generic_file_llseek, |
1e0bd755 | 1331 | }; |
1da177e4 LT |
1332 | #endif |
1333 | ||
f4f154fd AM |
1334 | #ifdef CONFIG_FAULT_INJECTION |
1335 | static ssize_t proc_fault_inject_read(struct file * file, char __user * buf, | |
1336 | size_t count, loff_t *ppos) | |
1337 | { | |
496ad9aa | 1338 | struct task_struct *task = get_proc_task(file_inode(file)); |
f4f154fd AM |
1339 | char buffer[PROC_NUMBUF]; |
1340 | size_t len; | |
1341 | int make_it_fail; | |
f4f154fd AM |
1342 | |
1343 | if (!task) | |
1344 | return -ESRCH; | |
1345 | make_it_fail = task->make_it_fail; | |
1346 | put_task_struct(task); | |
1347 | ||
1348 | len = snprintf(buffer, sizeof(buffer), "%i\n", make_it_fail); | |
0c28f287 AM |
1349 | |
1350 | return simple_read_from_buffer(buf, count, ppos, buffer, len); | |
f4f154fd AM |
1351 | } |
1352 | ||
1353 | static ssize_t proc_fault_inject_write(struct file * file, | |
1354 | const char __user * buf, size_t count, loff_t *ppos) | |
1355 | { | |
1356 | struct task_struct *task; | |
774636e1 | 1357 | char buffer[PROC_NUMBUF]; |
f4f154fd | 1358 | int make_it_fail; |
774636e1 | 1359 | int rv; |
f4f154fd AM |
1360 | |
1361 | if (!capable(CAP_SYS_RESOURCE)) | |
1362 | return -EPERM; | |
1363 | memset(buffer, 0, sizeof(buffer)); | |
1364 | if (count > sizeof(buffer) - 1) | |
1365 | count = sizeof(buffer) - 1; | |
1366 | if (copy_from_user(buffer, buf, count)) | |
1367 | return -EFAULT; | |
774636e1 AD |
1368 | rv = kstrtoint(strstrip(buffer), 0, &make_it_fail); |
1369 | if (rv < 0) | |
1370 | return rv; | |
16caed31 DJ |
1371 | if (make_it_fail < 0 || make_it_fail > 1) |
1372 | return -EINVAL; | |
1373 | ||
496ad9aa | 1374 | task = get_proc_task(file_inode(file)); |
f4f154fd AM |
1375 | if (!task) |
1376 | return -ESRCH; | |
1377 | task->make_it_fail = make_it_fail; | |
1378 | put_task_struct(task); | |
cba8aafe VL |
1379 | |
1380 | return count; | |
f4f154fd AM |
1381 | } |
1382 | ||
00977a59 | 1383 | static const struct file_operations proc_fault_inject_operations = { |
f4f154fd AM |
1384 | .read = proc_fault_inject_read, |
1385 | .write = proc_fault_inject_write, | |
87df8424 | 1386 | .llseek = generic_file_llseek, |
f4f154fd AM |
1387 | }; |
1388 | #endif | |
1389 | ||
9745512c | 1390 | |
43ae34cb IM |
1391 | #ifdef CONFIG_SCHED_DEBUG |
1392 | /* | |
1393 | * Print out various scheduling related per-task fields: | |
1394 | */ | |
1395 | static int sched_show(struct seq_file *m, void *v) | |
1396 | { | |
1397 | struct inode *inode = m->private; | |
1398 | struct task_struct *p; | |
1399 | ||
43ae34cb IM |
1400 | p = get_proc_task(inode); |
1401 | if (!p) | |
1402 | return -ESRCH; | |
1403 | proc_sched_show_task(p, m); | |
1404 | ||
1405 | put_task_struct(p); | |
1406 | ||
1407 | return 0; | |
1408 | } | |
1409 | ||
1410 | static ssize_t | |
1411 | sched_write(struct file *file, const char __user *buf, | |
1412 | size_t count, loff_t *offset) | |
1413 | { | |
496ad9aa | 1414 | struct inode *inode = file_inode(file); |
43ae34cb IM |
1415 | struct task_struct *p; |
1416 | ||
43ae34cb IM |
1417 | p = get_proc_task(inode); |
1418 | if (!p) | |
1419 | return -ESRCH; | |
1420 | proc_sched_set_task(p); | |
1421 | ||
1422 | put_task_struct(p); | |
1423 | ||
1424 | return count; | |
1425 | } | |
1426 | ||
1427 | static int sched_open(struct inode *inode, struct file *filp) | |
1428 | { | |
c6a34058 | 1429 | return single_open(filp, sched_show, inode); |
43ae34cb IM |
1430 | } |
1431 | ||
1432 | static const struct file_operations proc_pid_sched_operations = { | |
1433 | .open = sched_open, | |
1434 | .read = seq_read, | |
1435 | .write = sched_write, | |
1436 | .llseek = seq_lseek, | |
5ea473a1 | 1437 | .release = single_release, |
43ae34cb IM |
1438 | }; |
1439 | ||
1440 | #endif | |
1441 | ||
5091faa4 MG |
1442 | #ifdef CONFIG_SCHED_AUTOGROUP |
1443 | /* | |
1444 | * Print out autogroup related information: | |
1445 | */ | |
1446 | static int sched_autogroup_show(struct seq_file *m, void *v) | |
1447 | { | |
1448 | struct inode *inode = m->private; | |
1449 | struct task_struct *p; | |
1450 | ||
1451 | p = get_proc_task(inode); | |
1452 | if (!p) | |
1453 | return -ESRCH; | |
1454 | proc_sched_autogroup_show_task(p, m); | |
1455 | ||
1456 | put_task_struct(p); | |
1457 | ||
1458 | return 0; | |
1459 | } | |
1460 | ||
1461 | static ssize_t | |
1462 | sched_autogroup_write(struct file *file, const char __user *buf, | |
1463 | size_t count, loff_t *offset) | |
1464 | { | |
496ad9aa | 1465 | struct inode *inode = file_inode(file); |
5091faa4 MG |
1466 | struct task_struct *p; |
1467 | char buffer[PROC_NUMBUF]; | |
0a8cb8e3 | 1468 | int nice; |
5091faa4 MG |
1469 | int err; |
1470 | ||
1471 | memset(buffer, 0, sizeof(buffer)); | |
1472 | if (count > sizeof(buffer) - 1) | |
1473 | count = sizeof(buffer) - 1; | |
1474 | if (copy_from_user(buffer, buf, count)) | |
1475 | return -EFAULT; | |
1476 | ||
0a8cb8e3 AD |
1477 | err = kstrtoint(strstrip(buffer), 0, &nice); |
1478 | if (err < 0) | |
1479 | return err; | |
5091faa4 MG |
1480 | |
1481 | p = get_proc_task(inode); | |
1482 | if (!p) | |
1483 | return -ESRCH; | |
1484 | ||
2e5b5b3a | 1485 | err = proc_sched_autogroup_set_nice(p, nice); |
5091faa4 MG |
1486 | if (err) |
1487 | count = err; | |
1488 | ||
1489 | put_task_struct(p); | |
1490 | ||
1491 | return count; | |
1492 | } | |
1493 | ||
1494 | static int sched_autogroup_open(struct inode *inode, struct file *filp) | |
1495 | { | |
1496 | int ret; | |
1497 | ||
1498 | ret = single_open(filp, sched_autogroup_show, NULL); | |
1499 | if (!ret) { | |
1500 | struct seq_file *m = filp->private_data; | |
1501 | ||
1502 | m->private = inode; | |
1503 | } | |
1504 | return ret; | |
1505 | } | |
1506 | ||
1507 | static const struct file_operations proc_pid_sched_autogroup_operations = { | |
1508 | .open = sched_autogroup_open, | |
1509 | .read = seq_read, | |
1510 | .write = sched_autogroup_write, | |
1511 | .llseek = seq_lseek, | |
1512 | .release = single_release, | |
1513 | }; | |
1514 | ||
1515 | #endif /* CONFIG_SCHED_AUTOGROUP */ | |
1516 | ||
4614a696 JS |
1517 | static ssize_t comm_write(struct file *file, const char __user *buf, |
1518 | size_t count, loff_t *offset) | |
1519 | { | |
496ad9aa | 1520 | struct inode *inode = file_inode(file); |
4614a696 JS |
1521 | struct task_struct *p; |
1522 | char buffer[TASK_COMM_LEN]; | |
830e0fc9 | 1523 | const size_t maxlen = sizeof(buffer) - 1; |
4614a696 JS |
1524 | |
1525 | memset(buffer, 0, sizeof(buffer)); | |
830e0fc9 | 1526 | if (copy_from_user(buffer, buf, count > maxlen ? maxlen : count)) |
4614a696 JS |
1527 | return -EFAULT; |
1528 | ||
1529 | p = get_proc_task(inode); | |
1530 | if (!p) | |
1531 | return -ESRCH; | |
1532 | ||
1533 | if (same_thread_group(current, p)) | |
1534 | set_task_comm(p, buffer); | |
1535 | else | |
1536 | count = -EINVAL; | |
1537 | ||
1538 | put_task_struct(p); | |
1539 | ||
1540 | return count; | |
1541 | } | |
1542 | ||
1543 | static int comm_show(struct seq_file *m, void *v) | |
1544 | { | |
1545 | struct inode *inode = m->private; | |
1546 | struct task_struct *p; | |
1547 | ||
1548 | p = get_proc_task(inode); | |
1549 | if (!p) | |
1550 | return -ESRCH; | |
1551 | ||
1552 | task_lock(p); | |
1553 | seq_printf(m, "%s\n", p->comm); | |
1554 | task_unlock(p); | |
1555 | ||
1556 | put_task_struct(p); | |
1557 | ||
1558 | return 0; | |
1559 | } | |
1560 | ||
1561 | static int comm_open(struct inode *inode, struct file *filp) | |
1562 | { | |
c6a34058 | 1563 | return single_open(filp, comm_show, inode); |
4614a696 JS |
1564 | } |
1565 | ||
1566 | static const struct file_operations proc_pid_set_comm_operations = { | |
1567 | .open = comm_open, | |
1568 | .read = seq_read, | |
1569 | .write = comm_write, | |
1570 | .llseek = seq_lseek, | |
1571 | .release = single_release, | |
1572 | }; | |
1573 | ||
7773fbc5 | 1574 | static int proc_exe_link(struct dentry *dentry, struct path *exe_path) |
925d1c40 MH |
1575 | { |
1576 | struct task_struct *task; | |
925d1c40 MH |
1577 | struct file *exe_file; |
1578 | ||
2b0143b5 | 1579 | task = get_proc_task(d_inode(dentry)); |
925d1c40 MH |
1580 | if (!task) |
1581 | return -ENOENT; | |
cd81a917 | 1582 | exe_file = get_task_exe_file(task); |
925d1c40 | 1583 | put_task_struct(task); |
925d1c40 MH |
1584 | if (exe_file) { |
1585 | *exe_path = exe_file->f_path; | |
1586 | path_get(&exe_file->f_path); | |
1587 | fput(exe_file); | |
1588 | return 0; | |
1589 | } else | |
1590 | return -ENOENT; | |
1591 | } | |
1592 | ||
6b255391 | 1593 | static const char *proc_pid_get_link(struct dentry *dentry, |
fceef393 AV |
1594 | struct inode *inode, |
1595 | struct delayed_call *done) | |
1da177e4 | 1596 | { |
408ef013 | 1597 | struct path path; |
1da177e4 LT |
1598 | int error = -EACCES; |
1599 | ||
6b255391 AV |
1600 | if (!dentry) |
1601 | return ERR_PTR(-ECHILD); | |
1602 | ||
778c1144 EB |
1603 | /* Are we allowed to snoop on the tasks file descriptors? */ |
1604 | if (!proc_fd_access_allowed(inode)) | |
1da177e4 | 1605 | goto out; |
1da177e4 | 1606 | |
408ef013 CH |
1607 | error = PROC_I(inode)->op.proc_get_link(dentry, &path); |
1608 | if (error) | |
1609 | goto out; | |
1610 | ||
6e77137b | 1611 | nd_jump_link(&path); |
408ef013 | 1612 | return NULL; |
1da177e4 | 1613 | out: |
008b150a | 1614 | return ERR_PTR(error); |
1da177e4 LT |
1615 | } |
1616 | ||
3dcd25f3 | 1617 | static int do_proc_readlink(struct path *path, char __user *buffer, int buflen) |
1da177e4 | 1618 | { |
e12ba74d | 1619 | char *tmp = (char*)__get_free_page(GFP_TEMPORARY); |
3dcd25f3 | 1620 | char *pathname; |
1da177e4 LT |
1621 | int len; |
1622 | ||
1623 | if (!tmp) | |
1624 | return -ENOMEM; | |
0c28f287 | 1625 | |
7b2a69ba | 1626 | pathname = d_path(path, tmp, PAGE_SIZE); |
3dcd25f3 JB |
1627 | len = PTR_ERR(pathname); |
1628 | if (IS_ERR(pathname)) | |
1da177e4 | 1629 | goto out; |
3dcd25f3 | 1630 | len = tmp + PAGE_SIZE - 1 - pathname; |
1da177e4 LT |
1631 | |
1632 | if (len > buflen) | |
1633 | len = buflen; | |
3dcd25f3 | 1634 | if (copy_to_user(buffer, pathname, len)) |
1da177e4 LT |
1635 | len = -EFAULT; |
1636 | out: | |
1637 | free_page((unsigned long)tmp); | |
1638 | return len; | |
1639 | } | |
1640 | ||
1641 | static int proc_pid_readlink(struct dentry * dentry, char __user * buffer, int buflen) | |
1642 | { | |
1643 | int error = -EACCES; | |
2b0143b5 | 1644 | struct inode *inode = d_inode(dentry); |
3dcd25f3 | 1645 | struct path path; |
1da177e4 | 1646 | |
778c1144 EB |
1647 | /* Are we allowed to snoop on the tasks file descriptors? */ |
1648 | if (!proc_fd_access_allowed(inode)) | |
1da177e4 | 1649 | goto out; |
1da177e4 | 1650 | |
7773fbc5 | 1651 | error = PROC_I(inode)->op.proc_get_link(dentry, &path); |
1da177e4 LT |
1652 | if (error) |
1653 | goto out; | |
1654 | ||
3dcd25f3 JB |
1655 | error = do_proc_readlink(&path, buffer, buflen); |
1656 | path_put(&path); | |
1da177e4 | 1657 | out: |
1da177e4 LT |
1658 | return error; |
1659 | } | |
1660 | ||
faf60af1 | 1661 | const struct inode_operations proc_pid_link_inode_operations = { |
1da177e4 | 1662 | .readlink = proc_pid_readlink, |
6b255391 | 1663 | .get_link = proc_pid_get_link, |
6d76fa58 | 1664 | .setattr = proc_setattr, |
1da177e4 LT |
1665 | }; |
1666 | ||
28a6d671 EB |
1667 | |
1668 | /* building an inode */ | |
1669 | ||
db978da8 AG |
1670 | struct inode *proc_pid_make_inode(struct super_block * sb, |
1671 | struct task_struct *task, umode_t mode) | |
28a6d671 EB |
1672 | { |
1673 | struct inode * inode; | |
1674 | struct proc_inode *ei; | |
c69e8d9c | 1675 | const struct cred *cred; |
1da177e4 | 1676 | |
28a6d671 | 1677 | /* We need a new inode */ |
1da177e4 | 1678 | |
28a6d671 EB |
1679 | inode = new_inode(sb); |
1680 | if (!inode) | |
1681 | goto out; | |
1682 | ||
1683 | /* Common stuff */ | |
1684 | ei = PROC_I(inode); | |
db978da8 | 1685 | inode->i_mode = mode; |
85fe4025 | 1686 | inode->i_ino = get_next_ino(); |
078cd827 | 1687 | inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode); |
28a6d671 EB |
1688 | inode->i_op = &proc_def_inode_operations; |
1689 | ||
1690 | /* | |
1691 | * grab the reference to task. | |
1692 | */ | |
1a657f78 | 1693 | ei->pid = get_task_pid(task, PIDTYPE_PID); |
28a6d671 EB |
1694 | if (!ei->pid) |
1695 | goto out_unlock; | |
1696 | ||
28a6d671 | 1697 | if (task_dumpable(task)) { |
c69e8d9c DH |
1698 | rcu_read_lock(); |
1699 | cred = __task_cred(task); | |
1700 | inode->i_uid = cred->euid; | |
1701 | inode->i_gid = cred->egid; | |
1702 | rcu_read_unlock(); | |
1da177e4 | 1703 | } |
28a6d671 EB |
1704 | security_task_to_inode(task, inode); |
1705 | ||
1da177e4 | 1706 | out: |
28a6d671 EB |
1707 | return inode; |
1708 | ||
1709 | out_unlock: | |
1710 | iput(inode); | |
1711 | return NULL; | |
1da177e4 LT |
1712 | } |
1713 | ||
6b4e306a | 1714 | int pid_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) |
1da177e4 | 1715 | { |
2b0143b5 | 1716 | struct inode *inode = d_inode(dentry); |
28a6d671 | 1717 | struct task_struct *task; |
c69e8d9c | 1718 | const struct cred *cred; |
0499680a | 1719 | struct pid_namespace *pid = dentry->d_sb->s_fs_info; |
c69e8d9c | 1720 | |
28a6d671 | 1721 | generic_fillattr(inode, stat); |
1da177e4 | 1722 | |
28a6d671 | 1723 | rcu_read_lock(); |
dcb0f222 EB |
1724 | stat->uid = GLOBAL_ROOT_UID; |
1725 | stat->gid = GLOBAL_ROOT_GID; | |
28a6d671 EB |
1726 | task = pid_task(proc_pid(inode), PIDTYPE_PID); |
1727 | if (task) { | |
0499680a VK |
1728 | if (!has_pid_permissions(pid, task, 2)) { |
1729 | rcu_read_unlock(); | |
1730 | /* | |
1731 | * This doesn't prevent learning whether PID exists, | |
1732 | * it only makes getattr() consistent with readdir(). | |
1733 | */ | |
1734 | return -ENOENT; | |
1735 | } | |
28a6d671 EB |
1736 | if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) || |
1737 | task_dumpable(task)) { | |
c69e8d9c DH |
1738 | cred = __task_cred(task); |
1739 | stat->uid = cred->euid; | |
1740 | stat->gid = cred->egid; | |
1da177e4 LT |
1741 | } |
1742 | } | |
28a6d671 | 1743 | rcu_read_unlock(); |
d6e71144 | 1744 | return 0; |
1da177e4 LT |
1745 | } |
1746 | ||
1da177e4 LT |
1747 | /* dentry stuff */ |
1748 | ||
1749 | /* | |
1750 | * Exceptional case: normally we are not allowed to unhash a busy | |
1751 | * directory. In this case, however, we can do it - no aliasing problems | |
1752 | * due to the way we treat inodes. | |
1753 | * | |
1754 | * Rewrite the inode's ownerships here because the owning task may have | |
1755 | * performed a setuid(), etc. | |
99f89551 EB |
1756 | * |
1757 | * Before the /proc/pid/status file was created the only way to read | |
1758 | * the effective uid of a /process was to stat /proc/pid. Reading | |
1759 | * /proc/pid/status is slow enough that procps and other packages | |
1760 | * kept stating /proc/pid. To keep the rules in /proc simple I have | |
1761 | * made this apply to all per process world readable and executable | |
1762 | * directories. | |
1da177e4 | 1763 | */ |
0b728e19 | 1764 | int pid_revalidate(struct dentry *dentry, unsigned int flags) |
1da177e4 | 1765 | { |
34286d66 NP |
1766 | struct inode *inode; |
1767 | struct task_struct *task; | |
c69e8d9c DH |
1768 | const struct cred *cred; |
1769 | ||
0b728e19 | 1770 | if (flags & LOOKUP_RCU) |
34286d66 NP |
1771 | return -ECHILD; |
1772 | ||
2b0143b5 | 1773 | inode = d_inode(dentry); |
34286d66 NP |
1774 | task = get_proc_task(inode); |
1775 | ||
99f89551 EB |
1776 | if (task) { |
1777 | if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) || | |
1778 | task_dumpable(task)) { | |
c69e8d9c DH |
1779 | rcu_read_lock(); |
1780 | cred = __task_cred(task); | |
1781 | inode->i_uid = cred->euid; | |
1782 | inode->i_gid = cred->egid; | |
1783 | rcu_read_unlock(); | |
1da177e4 | 1784 | } else { |
dcb0f222 EB |
1785 | inode->i_uid = GLOBAL_ROOT_UID; |
1786 | inode->i_gid = GLOBAL_ROOT_GID; | |
1da177e4 | 1787 | } |
9ee8ab9f | 1788 | inode->i_mode &= ~(S_ISUID | S_ISGID); |
1da177e4 | 1789 | security_task_to_inode(task, inode); |
99f89551 | 1790 | put_task_struct(task); |
1da177e4 LT |
1791 | return 1; |
1792 | } | |
1da177e4 LT |
1793 | return 0; |
1794 | } | |
1795 | ||
d855a4b7 ON |
1796 | static inline bool proc_inode_is_dead(struct inode *inode) |
1797 | { | |
1798 | return !proc_pid(inode)->tasks[PIDTYPE_PID].first; | |
1799 | } | |
1800 | ||
1dd704b6 DH |
1801 | int pid_delete_dentry(const struct dentry *dentry) |
1802 | { | |
1803 | /* Is the task we represent dead? | |
1804 | * If so, then don't put the dentry on the lru list, | |
1805 | * kill it immediately. | |
1806 | */ | |
2b0143b5 | 1807 | return proc_inode_is_dead(d_inode(dentry)); |
1dd704b6 DH |
1808 | } |
1809 | ||
6b4e306a | 1810 | const struct dentry_operations pid_dentry_operations = |
28a6d671 EB |
1811 | { |
1812 | .d_revalidate = pid_revalidate, | |
1813 | .d_delete = pid_delete_dentry, | |
1814 | }; | |
1815 | ||
1816 | /* Lookups */ | |
1817 | ||
1c0d04c9 EB |
1818 | /* |
1819 | * Fill a directory entry. | |
1820 | * | |
1821 | * If possible create the dcache entry and derive our inode number and | |
1822 | * file type from dcache entry. | |
1823 | * | |
1824 | * Since all of the proc inode numbers are dynamically generated, the inode | |
1825 | * numbers do not exist until the inode is cache. This means creating the | |
1826 | * the dcache entry in readdir is necessary to keep the inode numbers | |
1827 | * reported by readdir in sync with the inode numbers reported | |
1828 | * by stat. | |
1829 | */ | |
f0c3b509 | 1830 | bool proc_fill_cache(struct file *file, struct dir_context *ctx, |
6b4e306a | 1831 | const char *name, int len, |
c5141e6d | 1832 | instantiate_t instantiate, struct task_struct *task, const void *ptr) |
61a28784 | 1833 | { |
f0c3b509 | 1834 | struct dentry *child, *dir = file->f_path.dentry; |
1df98b8b | 1835 | struct qstr qname = QSTR_INIT(name, len); |
61a28784 | 1836 | struct inode *inode; |
1df98b8b AV |
1837 | unsigned type; |
1838 | ino_t ino; | |
61a28784 | 1839 | |
1df98b8b | 1840 | child = d_hash_and_lookup(dir, &qname); |
61a28784 | 1841 | if (!child) { |
3781764b AV |
1842 | DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq); |
1843 | child = d_alloc_parallel(dir, &qname, &wq); | |
1844 | if (IS_ERR(child)) | |
1df98b8b | 1845 | goto end_instantiate; |
3781764b AV |
1846 | if (d_in_lookup(child)) { |
1847 | int err = instantiate(d_inode(dir), child, task, ptr); | |
1848 | d_lookup_done(child); | |
1849 | if (err < 0) { | |
1850 | dput(child); | |
1851 | goto end_instantiate; | |
1852 | } | |
61a28784 EB |
1853 | } |
1854 | } | |
2b0143b5 | 1855 | inode = d_inode(child); |
147ce699 AV |
1856 | ino = inode->i_ino; |
1857 | type = inode->i_mode >> 12; | |
61a28784 | 1858 | dput(child); |
f0c3b509 | 1859 | return dir_emit(ctx, name, len, ino, type); |
1df98b8b AV |
1860 | |
1861 | end_instantiate: | |
1862 | return dir_emit(ctx, name, len, 1, DT_UNKNOWN); | |
61a28784 EB |
1863 | } |
1864 | ||
640708a2 PE |
1865 | /* |
1866 | * dname_to_vma_addr - maps a dentry name into two unsigned longs | |
1867 | * which represent vma start and end addresses. | |
1868 | */ | |
1869 | static int dname_to_vma_addr(struct dentry *dentry, | |
1870 | unsigned long *start, unsigned long *end) | |
1871 | { | |
1872 | if (sscanf(dentry->d_name.name, "%lx-%lx", start, end) != 2) | |
1873 | return -EINVAL; | |
1874 | ||
1875 | return 0; | |
1876 | } | |
1877 | ||
0b728e19 | 1878 | static int map_files_d_revalidate(struct dentry *dentry, unsigned int flags) |
640708a2 PE |
1879 | { |
1880 | unsigned long vm_start, vm_end; | |
1881 | bool exact_vma_exists = false; | |
1882 | struct mm_struct *mm = NULL; | |
1883 | struct task_struct *task; | |
1884 | const struct cred *cred; | |
1885 | struct inode *inode; | |
1886 | int status = 0; | |
1887 | ||
0b728e19 | 1888 | if (flags & LOOKUP_RCU) |
640708a2 PE |
1889 | return -ECHILD; |
1890 | ||
2b0143b5 | 1891 | inode = d_inode(dentry); |
640708a2 PE |
1892 | task = get_proc_task(inode); |
1893 | if (!task) | |
1894 | goto out_notask; | |
1895 | ||
caaee623 | 1896 | mm = mm_access(task, PTRACE_MODE_READ_FSCREDS); |
2344bec7 | 1897 | if (IS_ERR_OR_NULL(mm)) |
640708a2 PE |
1898 | goto out; |
1899 | ||
1900 | if (!dname_to_vma_addr(dentry, &vm_start, &vm_end)) { | |
1901 | down_read(&mm->mmap_sem); | |
1902 | exact_vma_exists = !!find_exact_vma(mm, vm_start, vm_end); | |
1903 | up_read(&mm->mmap_sem); | |
1904 | } | |
1905 | ||
1906 | mmput(mm); | |
1907 | ||
1908 | if (exact_vma_exists) { | |
1909 | if (task_dumpable(task)) { | |
1910 | rcu_read_lock(); | |
1911 | cred = __task_cred(task); | |
1912 | inode->i_uid = cred->euid; | |
1913 | inode->i_gid = cred->egid; | |
1914 | rcu_read_unlock(); | |
1915 | } else { | |
dcb0f222 EB |
1916 | inode->i_uid = GLOBAL_ROOT_UID; |
1917 | inode->i_gid = GLOBAL_ROOT_GID; | |
640708a2 PE |
1918 | } |
1919 | security_task_to_inode(task, inode); | |
1920 | status = 1; | |
1921 | } | |
1922 | ||
1923 | out: | |
1924 | put_task_struct(task); | |
1925 | ||
1926 | out_notask: | |
640708a2 PE |
1927 | return status; |
1928 | } | |
1929 | ||
1930 | static const struct dentry_operations tid_map_files_dentry_operations = { | |
1931 | .d_revalidate = map_files_d_revalidate, | |
1932 | .d_delete = pid_delete_dentry, | |
1933 | }; | |
1934 | ||
6b255391 | 1935 | static int map_files_get_link(struct dentry *dentry, struct path *path) |
640708a2 PE |
1936 | { |
1937 | unsigned long vm_start, vm_end; | |
1938 | struct vm_area_struct *vma; | |
1939 | struct task_struct *task; | |
1940 | struct mm_struct *mm; | |
1941 | int rc; | |
1942 | ||
1943 | rc = -ENOENT; | |
2b0143b5 | 1944 | task = get_proc_task(d_inode(dentry)); |
640708a2 PE |
1945 | if (!task) |
1946 | goto out; | |
1947 | ||
1948 | mm = get_task_mm(task); | |
1949 | put_task_struct(task); | |
1950 | if (!mm) | |
1951 | goto out; | |
1952 | ||
1953 | rc = dname_to_vma_addr(dentry, &vm_start, &vm_end); | |
1954 | if (rc) | |
1955 | goto out_mmput; | |
1956 | ||
70335abb | 1957 | rc = -ENOENT; |
640708a2 PE |
1958 | down_read(&mm->mmap_sem); |
1959 | vma = find_exact_vma(mm, vm_start, vm_end); | |
1960 | if (vma && vma->vm_file) { | |
1961 | *path = vma->vm_file->f_path; | |
1962 | path_get(path); | |
1963 | rc = 0; | |
1964 | } | |
1965 | up_read(&mm->mmap_sem); | |
1966 | ||
1967 | out_mmput: | |
1968 | mmput(mm); | |
1969 | out: | |
1970 | return rc; | |
1971 | } | |
1972 | ||
1973 | struct map_files_info { | |
7b540d06 | 1974 | fmode_t mode; |
9a87fe0d | 1975 | unsigned int len; |
640708a2 PE |
1976 | unsigned char name[4*sizeof(long)+2]; /* max: %lx-%lx\0 */ |
1977 | }; | |
1978 | ||
bdb4d100 CO |
1979 | /* |
1980 | * Only allow CAP_SYS_ADMIN to follow the links, due to concerns about how the | |
1981 | * symlinks may be used to bypass permissions on ancestor directories in the | |
1982 | * path to the file in question. | |
1983 | */ | |
1984 | static const char * | |
6b255391 | 1985 | proc_map_files_get_link(struct dentry *dentry, |
fceef393 AV |
1986 | struct inode *inode, |
1987 | struct delayed_call *done) | |
bdb4d100 CO |
1988 | { |
1989 | if (!capable(CAP_SYS_ADMIN)) | |
1990 | return ERR_PTR(-EPERM); | |
1991 | ||
fceef393 | 1992 | return proc_pid_get_link(dentry, inode, done); |
bdb4d100 CO |
1993 | } |
1994 | ||
1995 | /* | |
6b255391 | 1996 | * Identical to proc_pid_link_inode_operations except for get_link() |
bdb4d100 CO |
1997 | */ |
1998 | static const struct inode_operations proc_map_files_link_inode_operations = { | |
1999 | .readlink = proc_pid_readlink, | |
6b255391 | 2000 | .get_link = proc_map_files_get_link, |
bdb4d100 CO |
2001 | .setattr = proc_setattr, |
2002 | }; | |
2003 | ||
c52a47ac | 2004 | static int |
640708a2 PE |
2005 | proc_map_files_instantiate(struct inode *dir, struct dentry *dentry, |
2006 | struct task_struct *task, const void *ptr) | |
2007 | { | |
7b540d06 | 2008 | fmode_t mode = (fmode_t)(unsigned long)ptr; |
640708a2 PE |
2009 | struct proc_inode *ei; |
2010 | struct inode *inode; | |
2011 | ||
db978da8 AG |
2012 | inode = proc_pid_make_inode(dir->i_sb, task, S_IFLNK | |
2013 | ((mode & FMODE_READ ) ? S_IRUSR : 0) | | |
2014 | ((mode & FMODE_WRITE) ? S_IWUSR : 0)); | |
640708a2 | 2015 | if (!inode) |
c52a47ac | 2016 | return -ENOENT; |
640708a2 PE |
2017 | |
2018 | ei = PROC_I(inode); | |
6b255391 | 2019 | ei->op.proc_get_link = map_files_get_link; |
640708a2 | 2020 | |
bdb4d100 | 2021 | inode->i_op = &proc_map_files_link_inode_operations; |
640708a2 | 2022 | inode->i_size = 64; |
640708a2 PE |
2023 | |
2024 | d_set_d_op(dentry, &tid_map_files_dentry_operations); | |
2025 | d_add(dentry, inode); | |
2026 | ||
c52a47ac | 2027 | return 0; |
640708a2 PE |
2028 | } |
2029 | ||
2030 | static struct dentry *proc_map_files_lookup(struct inode *dir, | |
00cd8dd3 | 2031 | struct dentry *dentry, unsigned int flags) |
640708a2 PE |
2032 | { |
2033 | unsigned long vm_start, vm_end; | |
2034 | struct vm_area_struct *vma; | |
2035 | struct task_struct *task; | |
c52a47ac | 2036 | int result; |
640708a2 PE |
2037 | struct mm_struct *mm; |
2038 | ||
c52a47ac | 2039 | result = -ENOENT; |
640708a2 PE |
2040 | task = get_proc_task(dir); |
2041 | if (!task) | |
2042 | goto out; | |
2043 | ||
c52a47ac | 2044 | result = -EACCES; |
caaee623 | 2045 | if (!ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS)) |
640708a2 PE |
2046 | goto out_put_task; |
2047 | ||
c52a47ac | 2048 | result = -ENOENT; |
640708a2 | 2049 | if (dname_to_vma_addr(dentry, &vm_start, &vm_end)) |
eb94cd96 | 2050 | goto out_put_task; |
640708a2 PE |
2051 | |
2052 | mm = get_task_mm(task); | |
2053 | if (!mm) | |
eb94cd96 | 2054 | goto out_put_task; |
640708a2 PE |
2055 | |
2056 | down_read(&mm->mmap_sem); | |
2057 | vma = find_exact_vma(mm, vm_start, vm_end); | |
2058 | if (!vma) | |
2059 | goto out_no_vma; | |
2060 | ||
05f56484 SK |
2061 | if (vma->vm_file) |
2062 | result = proc_map_files_instantiate(dir, dentry, task, | |
2063 | (void *)(unsigned long)vma->vm_file->f_mode); | |
640708a2 PE |
2064 | |
2065 | out_no_vma: | |
2066 | up_read(&mm->mmap_sem); | |
2067 | mmput(mm); | |
640708a2 PE |
2068 | out_put_task: |
2069 | put_task_struct(task); | |
2070 | out: | |
c52a47ac | 2071 | return ERR_PTR(result); |
640708a2 PE |
2072 | } |
2073 | ||
2074 | static const struct inode_operations proc_map_files_inode_operations = { | |
2075 | .lookup = proc_map_files_lookup, | |
2076 | .permission = proc_fd_permission, | |
2077 | .setattr = proc_setattr, | |
2078 | }; | |
2079 | ||
2080 | static int | |
f0c3b509 | 2081 | proc_map_files_readdir(struct file *file, struct dir_context *ctx) |
640708a2 | 2082 | { |
640708a2 PE |
2083 | struct vm_area_struct *vma; |
2084 | struct task_struct *task; | |
2085 | struct mm_struct *mm; | |
f0c3b509 AV |
2086 | unsigned long nr_files, pos, i; |
2087 | struct flex_array *fa = NULL; | |
2088 | struct map_files_info info; | |
2089 | struct map_files_info *p; | |
640708a2 PE |
2090 | int ret; |
2091 | ||
640708a2 | 2092 | ret = -ENOENT; |
f0c3b509 | 2093 | task = get_proc_task(file_inode(file)); |
640708a2 PE |
2094 | if (!task) |
2095 | goto out; | |
2096 | ||
2097 | ret = -EACCES; | |
caaee623 | 2098 | if (!ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS)) |
640708a2 PE |
2099 | goto out_put_task; |
2100 | ||
2101 | ret = 0; | |
f0c3b509 AV |
2102 | if (!dir_emit_dots(file, ctx)) |
2103 | goto out_put_task; | |
640708a2 | 2104 | |
f0c3b509 AV |
2105 | mm = get_task_mm(task); |
2106 | if (!mm) | |
2107 | goto out_put_task; | |
2108 | down_read(&mm->mmap_sem); | |
640708a2 | 2109 | |
f0c3b509 | 2110 | nr_files = 0; |
640708a2 | 2111 | |
f0c3b509 AV |
2112 | /* |
2113 | * We need two passes here: | |
2114 | * | |
2115 | * 1) Collect vmas of mapped files with mmap_sem taken | |
2116 | * 2) Release mmap_sem and instantiate entries | |
2117 | * | |
2118 | * otherwise we get lockdep complained, since filldir() | |
2119 | * routine might require mmap_sem taken in might_fault(). | |
2120 | */ | |
640708a2 | 2121 | |
f0c3b509 AV |
2122 | for (vma = mm->mmap, pos = 2; vma; vma = vma->vm_next) { |
2123 | if (vma->vm_file && ++pos > ctx->pos) | |
2124 | nr_files++; | |
2125 | } | |
2126 | ||
2127 | if (nr_files) { | |
2128 | fa = flex_array_alloc(sizeof(info), nr_files, | |
2129 | GFP_KERNEL); | |
2130 | if (!fa || flex_array_prealloc(fa, 0, nr_files, | |
2131 | GFP_KERNEL)) { | |
2132 | ret = -ENOMEM; | |
2133 | if (fa) | |
2134 | flex_array_free(fa); | |
2135 | up_read(&mm->mmap_sem); | |
2136 | mmput(mm); | |
2137 | goto out_put_task; | |
640708a2 | 2138 | } |
f0c3b509 AV |
2139 | for (i = 0, vma = mm->mmap, pos = 2; vma; |
2140 | vma = vma->vm_next) { | |
2141 | if (!vma->vm_file) | |
2142 | continue; | |
2143 | if (++pos <= ctx->pos) | |
2144 | continue; | |
2145 | ||
2146 | info.mode = vma->vm_file->f_mode; | |
2147 | info.len = snprintf(info.name, | |
2148 | sizeof(info.name), "%lx-%lx", | |
2149 | vma->vm_start, vma->vm_end); | |
2150 | if (flex_array_put(fa, i++, &info, GFP_KERNEL)) | |
2151 | BUG(); | |
640708a2 | 2152 | } |
640708a2 | 2153 | } |
f0c3b509 AV |
2154 | up_read(&mm->mmap_sem); |
2155 | ||
2156 | for (i = 0; i < nr_files; i++) { | |
2157 | p = flex_array_get(fa, i); | |
2158 | if (!proc_fill_cache(file, ctx, | |
2159 | p->name, p->len, | |
2160 | proc_map_files_instantiate, | |
2161 | task, | |
2162 | (void *)(unsigned long)p->mode)) | |
2163 | break; | |
2164 | ctx->pos++; | |
640708a2 | 2165 | } |
f0c3b509 AV |
2166 | if (fa) |
2167 | flex_array_free(fa); | |
2168 | mmput(mm); | |
640708a2 | 2169 | |
640708a2 PE |
2170 | out_put_task: |
2171 | put_task_struct(task); | |
2172 | out: | |
2173 | return ret; | |
2174 | } | |
2175 | ||
2176 | static const struct file_operations proc_map_files_operations = { | |
2177 | .read = generic_read_dir, | |
f50752ea AV |
2178 | .iterate_shared = proc_map_files_readdir, |
2179 | .llseek = generic_file_llseek, | |
640708a2 PE |
2180 | }; |
2181 | ||
b5946bea | 2182 | #ifdef CONFIG_CHECKPOINT_RESTORE |
48f6a7a5 PE |
2183 | struct timers_private { |
2184 | struct pid *pid; | |
2185 | struct task_struct *task; | |
2186 | struct sighand_struct *sighand; | |
57b8015e | 2187 | struct pid_namespace *ns; |
48f6a7a5 PE |
2188 | unsigned long flags; |
2189 | }; | |
2190 | ||
2191 | static void *timers_start(struct seq_file *m, loff_t *pos) | |
2192 | { | |
2193 | struct timers_private *tp = m->private; | |
2194 | ||
2195 | tp->task = get_pid_task(tp->pid, PIDTYPE_PID); | |
2196 | if (!tp->task) | |
2197 | return ERR_PTR(-ESRCH); | |
2198 | ||
2199 | tp->sighand = lock_task_sighand(tp->task, &tp->flags); | |
2200 | if (!tp->sighand) | |
2201 | return ERR_PTR(-ESRCH); | |
2202 | ||
2203 | return seq_list_start(&tp->task->signal->posix_timers, *pos); | |
2204 | } | |
2205 | ||
2206 | static void *timers_next(struct seq_file *m, void *v, loff_t *pos) | |
2207 | { | |
2208 | struct timers_private *tp = m->private; | |
2209 | return seq_list_next(v, &tp->task->signal->posix_timers, pos); | |
2210 | } | |
2211 | ||
2212 | static void timers_stop(struct seq_file *m, void *v) | |
2213 | { | |
2214 | struct timers_private *tp = m->private; | |
2215 | ||
2216 | if (tp->sighand) { | |
2217 | unlock_task_sighand(tp->task, &tp->flags); | |
2218 | tp->sighand = NULL; | |
2219 | } | |
2220 | ||
2221 | if (tp->task) { | |
2222 | put_task_struct(tp->task); | |
2223 | tp->task = NULL; | |
2224 | } | |
2225 | } | |
2226 | ||
2227 | static int show_timer(struct seq_file *m, void *v) | |
2228 | { | |
2229 | struct k_itimer *timer; | |
57b8015e PE |
2230 | struct timers_private *tp = m->private; |
2231 | int notify; | |
cedbccab | 2232 | static const char * const nstr[] = { |
57b8015e PE |
2233 | [SIGEV_SIGNAL] = "signal", |
2234 | [SIGEV_NONE] = "none", | |
2235 | [SIGEV_THREAD] = "thread", | |
2236 | }; | |
48f6a7a5 PE |
2237 | |
2238 | timer = list_entry((struct list_head *)v, struct k_itimer, list); | |
57b8015e PE |
2239 | notify = timer->it_sigev_notify; |
2240 | ||
48f6a7a5 | 2241 | seq_printf(m, "ID: %d\n", timer->it_id); |
25ce3191 JP |
2242 | seq_printf(m, "signal: %d/%p\n", |
2243 | timer->sigq->info.si_signo, | |
2244 | timer->sigq->info.si_value.sival_ptr); | |
57b8015e | 2245 | seq_printf(m, "notify: %s/%s.%d\n", |
25ce3191 JP |
2246 | nstr[notify & ~SIGEV_THREAD_ID], |
2247 | (notify & SIGEV_THREAD_ID) ? "tid" : "pid", | |
2248 | pid_nr_ns(timer->it_pid, tp->ns)); | |
15ef0298 | 2249 | seq_printf(m, "ClockID: %d\n", timer->it_clock); |
48f6a7a5 PE |
2250 | |
2251 | return 0; | |
2252 | } | |
2253 | ||
2254 | static const struct seq_operations proc_timers_seq_ops = { | |
2255 | .start = timers_start, | |
2256 | .next = timers_next, | |
2257 | .stop = timers_stop, | |
2258 | .show = show_timer, | |
2259 | }; | |
2260 | ||
2261 | static int proc_timers_open(struct inode *inode, struct file *file) | |
2262 | { | |
2263 | struct timers_private *tp; | |
2264 | ||
2265 | tp = __seq_open_private(file, &proc_timers_seq_ops, | |
2266 | sizeof(struct timers_private)); | |
2267 | if (!tp) | |
2268 | return -ENOMEM; | |
2269 | ||
2270 | tp->pid = proc_pid(inode); | |
57b8015e | 2271 | tp->ns = inode->i_sb->s_fs_info; |
48f6a7a5 PE |
2272 | return 0; |
2273 | } | |
2274 | ||
2275 | static const struct file_operations proc_timers_operations = { | |
2276 | .open = proc_timers_open, | |
2277 | .read = seq_read, | |
2278 | .llseek = seq_lseek, | |
2279 | .release = seq_release_private, | |
2280 | }; | |
b5946bea | 2281 | #endif |
640708a2 | 2282 | |
5de23d43 JS |
2283 | static ssize_t timerslack_ns_write(struct file *file, const char __user *buf, |
2284 | size_t count, loff_t *offset) | |
2285 | { | |
2286 | struct inode *inode = file_inode(file); | |
2287 | struct task_struct *p; | |
2288 | u64 slack_ns; | |
2289 | int err; | |
2290 | ||
2291 | err = kstrtoull_from_user(buf, count, 10, &slack_ns); | |
2292 | if (err < 0) | |
2293 | return err; | |
2294 | ||
2295 | p = get_proc_task(inode); | |
2296 | if (!p) | |
2297 | return -ESRCH; | |
2298 | ||
4b2bd5fe JS |
2299 | if (p != current) { |
2300 | if (!capable(CAP_SYS_NICE)) { | |
2301 | count = -EPERM; | |
2302 | goto out; | |
2303 | } | |
5de23d43 | 2304 | |
4b2bd5fe JS |
2305 | err = security_task_setscheduler(p); |
2306 | if (err) { | |
2307 | count = err; | |
2308 | goto out; | |
2309 | } | |
904763e1 JS |
2310 | } |
2311 | ||
7abbaf94 JS |
2312 | task_lock(p); |
2313 | if (slack_ns == 0) | |
2314 | p->timer_slack_ns = p->default_timer_slack_ns; | |
2315 | else | |
2316 | p->timer_slack_ns = slack_ns; | |
2317 | task_unlock(p); | |
2318 | ||
2319 | out: | |
5de23d43 JS |
2320 | put_task_struct(p); |
2321 | ||
2322 | return count; | |
2323 | } | |
2324 | ||
2325 | static int timerslack_ns_show(struct seq_file *m, void *v) | |
2326 | { | |
2327 | struct inode *inode = m->private; | |
2328 | struct task_struct *p; | |
7abbaf94 | 2329 | int err = 0; |
5de23d43 JS |
2330 | |
2331 | p = get_proc_task(inode); | |
2332 | if (!p) | |
2333 | return -ESRCH; | |
2334 | ||
4b2bd5fe | 2335 | if (p != current) { |
5de23d43 | 2336 | |
4b2bd5fe JS |
2337 | if (!capable(CAP_SYS_NICE)) { |
2338 | err = -EPERM; | |
2339 | goto out; | |
2340 | } | |
2341 | err = security_task_getscheduler(p); | |
2342 | if (err) | |
2343 | goto out; | |
2344 | } | |
904763e1 | 2345 | |
7abbaf94 JS |
2346 | task_lock(p); |
2347 | seq_printf(m, "%llu\n", p->timer_slack_ns); | |
2348 | task_unlock(p); | |
2349 | ||
2350 | out: | |
5de23d43 JS |
2351 | put_task_struct(p); |
2352 | ||
2353 | return err; | |
2354 | } | |
2355 | ||
2356 | static int timerslack_ns_open(struct inode *inode, struct file *filp) | |
2357 | { | |
2358 | return single_open(filp, timerslack_ns_show, inode); | |
2359 | } | |
2360 | ||
2361 | static const struct file_operations proc_pid_set_timerslack_ns_operations = { | |
2362 | .open = timerslack_ns_open, | |
2363 | .read = seq_read, | |
2364 | .write = timerslack_ns_write, | |
2365 | .llseek = seq_lseek, | |
2366 | .release = single_release, | |
2367 | }; | |
2368 | ||
c52a47ac | 2369 | static int proc_pident_instantiate(struct inode *dir, |
c5141e6d | 2370 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
444ceed8 | 2371 | { |
c5141e6d | 2372 | const struct pid_entry *p = ptr; |
444ceed8 EB |
2373 | struct inode *inode; |
2374 | struct proc_inode *ei; | |
444ceed8 | 2375 | |
db978da8 | 2376 | inode = proc_pid_make_inode(dir->i_sb, task, p->mode); |
444ceed8 EB |
2377 | if (!inode) |
2378 | goto out; | |
2379 | ||
2380 | ei = PROC_I(inode); | |
444ceed8 | 2381 | if (S_ISDIR(inode->i_mode)) |
bfe86848 | 2382 | set_nlink(inode, 2); /* Use getattr to fix if necessary */ |
444ceed8 EB |
2383 | if (p->iop) |
2384 | inode->i_op = p->iop; | |
2385 | if (p->fop) | |
2386 | inode->i_fop = p->fop; | |
2387 | ei->op = p->op; | |
fb045adb | 2388 | d_set_d_op(dentry, &pid_dentry_operations); |
444ceed8 EB |
2389 | d_add(dentry, inode); |
2390 | /* Close the race of the process dying before we return the dentry */ | |
0b728e19 | 2391 | if (pid_revalidate(dentry, 0)) |
c52a47ac | 2392 | return 0; |
444ceed8 | 2393 | out: |
c52a47ac | 2394 | return -ENOENT; |
444ceed8 EB |
2395 | } |
2396 | ||
1da177e4 LT |
2397 | static struct dentry *proc_pident_lookup(struct inode *dir, |
2398 | struct dentry *dentry, | |
c5141e6d | 2399 | const struct pid_entry *ents, |
7bcd6b0e | 2400 | unsigned int nents) |
1da177e4 | 2401 | { |
c52a47ac | 2402 | int error; |
99f89551 | 2403 | struct task_struct *task = get_proc_task(dir); |
c5141e6d | 2404 | const struct pid_entry *p, *last; |
1da177e4 | 2405 | |
c52a47ac | 2406 | error = -ENOENT; |
1da177e4 | 2407 | |
99f89551 EB |
2408 | if (!task) |
2409 | goto out_no_task; | |
1da177e4 | 2410 | |
20cdc894 EB |
2411 | /* |
2412 | * Yes, it does not scale. And it should not. Don't add | |
2413 | * new entries into /proc/<tgid>/ without very good reasons. | |
2414 | */ | |
bac5f5d5 AD |
2415 | last = &ents[nents]; |
2416 | for (p = ents; p < last; p++) { | |
1da177e4 LT |
2417 | if (p->len != dentry->d_name.len) |
2418 | continue; | |
2419 | if (!memcmp(dentry->d_name.name, p->name, p->len)) | |
2420 | break; | |
2421 | } | |
bac5f5d5 | 2422 | if (p >= last) |
1da177e4 LT |
2423 | goto out; |
2424 | ||
444ceed8 | 2425 | error = proc_pident_instantiate(dir, dentry, task, p); |
1da177e4 | 2426 | out: |
99f89551 EB |
2427 | put_task_struct(task); |
2428 | out_no_task: | |
c52a47ac | 2429 | return ERR_PTR(error); |
1da177e4 LT |
2430 | } |
2431 | ||
f0c3b509 | 2432 | static int proc_pident_readdir(struct file *file, struct dir_context *ctx, |
c5141e6d | 2433 | const struct pid_entry *ents, unsigned int nents) |
28a6d671 | 2434 | { |
f0c3b509 AV |
2435 | struct task_struct *task = get_proc_task(file_inode(file)); |
2436 | const struct pid_entry *p; | |
28a6d671 | 2437 | |
28a6d671 | 2438 | if (!task) |
f0c3b509 | 2439 | return -ENOENT; |
28a6d671 | 2440 | |
f0c3b509 AV |
2441 | if (!dir_emit_dots(file, ctx)) |
2442 | goto out; | |
2443 | ||
2444 | if (ctx->pos >= nents + 2) | |
2445 | goto out; | |
28a6d671 | 2446 | |
bac5f5d5 | 2447 | for (p = ents + (ctx->pos - 2); p < ents + nents; p++) { |
f0c3b509 AV |
2448 | if (!proc_fill_cache(file, ctx, p->name, p->len, |
2449 | proc_pident_instantiate, task, p)) | |
2450 | break; | |
2451 | ctx->pos++; | |
2452 | } | |
28a6d671 | 2453 | out: |
61a28784 | 2454 | put_task_struct(task); |
f0c3b509 | 2455 | return 0; |
1da177e4 LT |
2456 | } |
2457 | ||
28a6d671 EB |
2458 | #ifdef CONFIG_SECURITY |
2459 | static ssize_t proc_pid_attr_read(struct file * file, char __user * buf, | |
2460 | size_t count, loff_t *ppos) | |
2461 | { | |
496ad9aa | 2462 | struct inode * inode = file_inode(file); |
04ff9708 | 2463 | char *p = NULL; |
28a6d671 EB |
2464 | ssize_t length; |
2465 | struct task_struct *task = get_proc_task(inode); | |
2466 | ||
28a6d671 | 2467 | if (!task) |
04ff9708 | 2468 | return -ESRCH; |
28a6d671 EB |
2469 | |
2470 | length = security_getprocattr(task, | |
2fddfeef | 2471 | (char*)file->f_path.dentry->d_name.name, |
04ff9708 | 2472 | &p); |
28a6d671 | 2473 | put_task_struct(task); |
04ff9708 AV |
2474 | if (length > 0) |
2475 | length = simple_read_from_buffer(buf, count, ppos, p, length); | |
2476 | kfree(p); | |
28a6d671 | 2477 | return length; |
1da177e4 LT |
2478 | } |
2479 | ||
28a6d671 EB |
2480 | static ssize_t proc_pid_attr_write(struct file * file, const char __user * buf, |
2481 | size_t count, loff_t *ppos) | |
2482 | { | |
496ad9aa | 2483 | struct inode * inode = file_inode(file); |
bb646cdb | 2484 | void *page; |
28a6d671 EB |
2485 | ssize_t length; |
2486 | struct task_struct *task = get_proc_task(inode); | |
2487 | ||
2488 | length = -ESRCH; | |
2489 | if (!task) | |
2490 | goto out_no_task; | |
b21507e2 SS |
2491 | |
2492 | /* A task may only write its own attributes. */ | |
2493 | length = -EACCES; | |
2494 | if (current != task) | |
2495 | goto out; | |
2496 | ||
28a6d671 EB |
2497 | if (count > PAGE_SIZE) |
2498 | count = PAGE_SIZE; | |
2499 | ||
2500 | /* No partial writes. */ | |
2501 | length = -EINVAL; | |
2502 | if (*ppos != 0) | |
2503 | goto out; | |
2504 | ||
bb646cdb AV |
2505 | page = memdup_user(buf, count); |
2506 | if (IS_ERR(page)) { | |
2507 | length = PTR_ERR(page); | |
28a6d671 | 2508 | goto out; |
bb646cdb | 2509 | } |
28a6d671 | 2510 | |
107db7c7 | 2511 | /* Guard against adverse ptrace interaction */ |
b21507e2 | 2512 | length = mutex_lock_interruptible(¤t->signal->cred_guard_mutex); |
107db7c7 DH |
2513 | if (length < 0) |
2514 | goto out_free; | |
2515 | ||
b21507e2 | 2516 | length = security_setprocattr(file->f_path.dentry->d_name.name, |
bb646cdb | 2517 | page, count); |
b21507e2 | 2518 | mutex_unlock(¤t->signal->cred_guard_mutex); |
28a6d671 | 2519 | out_free: |
bb646cdb | 2520 | kfree(page); |
28a6d671 EB |
2521 | out: |
2522 | put_task_struct(task); | |
2523 | out_no_task: | |
2524 | return length; | |
2525 | } | |
2526 | ||
00977a59 | 2527 | static const struct file_operations proc_pid_attr_operations = { |
28a6d671 EB |
2528 | .read = proc_pid_attr_read, |
2529 | .write = proc_pid_attr_write, | |
87df8424 | 2530 | .llseek = generic_file_llseek, |
28a6d671 EB |
2531 | }; |
2532 | ||
c5141e6d | 2533 | static const struct pid_entry attr_dir_stuff[] = { |
631f9c18 AD |
2534 | REG("current", S_IRUGO|S_IWUGO, proc_pid_attr_operations), |
2535 | REG("prev", S_IRUGO, proc_pid_attr_operations), | |
2536 | REG("exec", S_IRUGO|S_IWUGO, proc_pid_attr_operations), | |
2537 | REG("fscreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations), | |
2538 | REG("keycreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations), | |
2539 | REG("sockcreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations), | |
28a6d671 EB |
2540 | }; |
2541 | ||
f0c3b509 | 2542 | static int proc_attr_dir_readdir(struct file *file, struct dir_context *ctx) |
28a6d671 | 2543 | { |
f0c3b509 AV |
2544 | return proc_pident_readdir(file, ctx, |
2545 | attr_dir_stuff, ARRAY_SIZE(attr_dir_stuff)); | |
28a6d671 EB |
2546 | } |
2547 | ||
00977a59 | 2548 | static const struct file_operations proc_attr_dir_operations = { |
1da177e4 | 2549 | .read = generic_read_dir, |
f50752ea AV |
2550 | .iterate_shared = proc_attr_dir_readdir, |
2551 | .llseek = generic_file_llseek, | |
1da177e4 LT |
2552 | }; |
2553 | ||
72d9dcfc | 2554 | static struct dentry *proc_attr_dir_lookup(struct inode *dir, |
00cd8dd3 | 2555 | struct dentry *dentry, unsigned int flags) |
28a6d671 | 2556 | { |
7bcd6b0e EB |
2557 | return proc_pident_lookup(dir, dentry, |
2558 | attr_dir_stuff, ARRAY_SIZE(attr_dir_stuff)); | |
28a6d671 EB |
2559 | } |
2560 | ||
c5ef1c42 | 2561 | static const struct inode_operations proc_attr_dir_inode_operations = { |
72d9dcfc | 2562 | .lookup = proc_attr_dir_lookup, |
99f89551 | 2563 | .getattr = pid_getattr, |
6d76fa58 | 2564 | .setattr = proc_setattr, |
1da177e4 LT |
2565 | }; |
2566 | ||
28a6d671 EB |
2567 | #endif |
2568 | ||
698ba7b5 | 2569 | #ifdef CONFIG_ELF_CORE |
3cb4a0bb KH |
2570 | static ssize_t proc_coredump_filter_read(struct file *file, char __user *buf, |
2571 | size_t count, loff_t *ppos) | |
2572 | { | |
496ad9aa | 2573 | struct task_struct *task = get_proc_task(file_inode(file)); |
3cb4a0bb KH |
2574 | struct mm_struct *mm; |
2575 | char buffer[PROC_NUMBUF]; | |
2576 | size_t len; | |
2577 | int ret; | |
2578 | ||
2579 | if (!task) | |
2580 | return -ESRCH; | |
2581 | ||
2582 | ret = 0; | |
2583 | mm = get_task_mm(task); | |
2584 | if (mm) { | |
2585 | len = snprintf(buffer, sizeof(buffer), "%08lx\n", | |
2586 | ((mm->flags & MMF_DUMP_FILTER_MASK) >> | |
2587 | MMF_DUMP_FILTER_SHIFT)); | |
2588 | mmput(mm); | |
2589 | ret = simple_read_from_buffer(buf, count, ppos, buffer, len); | |
2590 | } | |
2591 | ||
2592 | put_task_struct(task); | |
2593 | ||
2594 | return ret; | |
2595 | } | |
2596 | ||
2597 | static ssize_t proc_coredump_filter_write(struct file *file, | |
2598 | const char __user *buf, | |
2599 | size_t count, | |
2600 | loff_t *ppos) | |
2601 | { | |
2602 | struct task_struct *task; | |
2603 | struct mm_struct *mm; | |
3cb4a0bb KH |
2604 | unsigned int val; |
2605 | int ret; | |
2606 | int i; | |
2607 | unsigned long mask; | |
2608 | ||
774636e1 AD |
2609 | ret = kstrtouint_from_user(buf, count, 0, &val); |
2610 | if (ret < 0) | |
2611 | return ret; | |
3cb4a0bb KH |
2612 | |
2613 | ret = -ESRCH; | |
496ad9aa | 2614 | task = get_proc_task(file_inode(file)); |
3cb4a0bb KH |
2615 | if (!task) |
2616 | goto out_no_task; | |
2617 | ||
3cb4a0bb KH |
2618 | mm = get_task_mm(task); |
2619 | if (!mm) | |
2620 | goto out_no_mm; | |
41a0c249 | 2621 | ret = 0; |
3cb4a0bb KH |
2622 | |
2623 | for (i = 0, mask = 1; i < MMF_DUMP_FILTER_BITS; i++, mask <<= 1) { | |
2624 | if (val & mask) | |
2625 | set_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags); | |
2626 | else | |
2627 | clear_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags); | |
2628 | } | |
2629 | ||
2630 | mmput(mm); | |
2631 | out_no_mm: | |
2632 | put_task_struct(task); | |
2633 | out_no_task: | |
774636e1 AD |
2634 | if (ret < 0) |
2635 | return ret; | |
2636 | return count; | |
3cb4a0bb KH |
2637 | } |
2638 | ||
2639 | static const struct file_operations proc_coredump_filter_operations = { | |
2640 | .read = proc_coredump_filter_read, | |
2641 | .write = proc_coredump_filter_write, | |
87df8424 | 2642 | .llseek = generic_file_llseek, |
3cb4a0bb KH |
2643 | }; |
2644 | #endif | |
2645 | ||
aba76fdb | 2646 | #ifdef CONFIG_TASK_IO_ACCOUNTING |
19aadc98 | 2647 | static int do_io_accounting(struct task_struct *task, struct seq_file *m, int whole) |
297c5d92 | 2648 | { |
940389b8 | 2649 | struct task_io_accounting acct = task->ioac; |
5995477a | 2650 | unsigned long flags; |
293eb1e7 | 2651 | int result; |
5995477a | 2652 | |
293eb1e7 VK |
2653 | result = mutex_lock_killable(&task->signal->cred_guard_mutex); |
2654 | if (result) | |
2655 | return result; | |
2656 | ||
caaee623 | 2657 | if (!ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS)) { |
293eb1e7 VK |
2658 | result = -EACCES; |
2659 | goto out_unlock; | |
2660 | } | |
1d1221f3 | 2661 | |
5995477a AR |
2662 | if (whole && lock_task_sighand(task, &flags)) { |
2663 | struct task_struct *t = task; | |
2664 | ||
2665 | task_io_accounting_add(&acct, &task->signal->ioac); | |
2666 | while_each_thread(task, t) | |
2667 | task_io_accounting_add(&acct, &t->ioac); | |
2668 | ||
2669 | unlock_task_sighand(task, &flags); | |
297c5d92 | 2670 | } |
25ce3191 JP |
2671 | seq_printf(m, |
2672 | "rchar: %llu\n" | |
2673 | "wchar: %llu\n" | |
2674 | "syscr: %llu\n" | |
2675 | "syscw: %llu\n" | |
2676 | "read_bytes: %llu\n" | |
2677 | "write_bytes: %llu\n" | |
2678 | "cancelled_write_bytes: %llu\n", | |
2679 | (unsigned long long)acct.rchar, | |
2680 | (unsigned long long)acct.wchar, | |
2681 | (unsigned long long)acct.syscr, | |
2682 | (unsigned long long)acct.syscw, | |
2683 | (unsigned long long)acct.read_bytes, | |
2684 | (unsigned long long)acct.write_bytes, | |
2685 | (unsigned long long)acct.cancelled_write_bytes); | |
2686 | result = 0; | |
2687 | ||
293eb1e7 VK |
2688 | out_unlock: |
2689 | mutex_unlock(&task->signal->cred_guard_mutex); | |
2690 | return result; | |
297c5d92 AR |
2691 | } |
2692 | ||
19aadc98 AD |
2693 | static int proc_tid_io_accounting(struct seq_file *m, struct pid_namespace *ns, |
2694 | struct pid *pid, struct task_struct *task) | |
297c5d92 | 2695 | { |
19aadc98 | 2696 | return do_io_accounting(task, m, 0); |
aba76fdb | 2697 | } |
297c5d92 | 2698 | |
19aadc98 AD |
2699 | static int proc_tgid_io_accounting(struct seq_file *m, struct pid_namespace *ns, |
2700 | struct pid *pid, struct task_struct *task) | |
297c5d92 | 2701 | { |
19aadc98 | 2702 | return do_io_accounting(task, m, 1); |
297c5d92 AR |
2703 | } |
2704 | #endif /* CONFIG_TASK_IO_ACCOUNTING */ | |
aba76fdb | 2705 | |
22d917d8 EB |
2706 | #ifdef CONFIG_USER_NS |
2707 | static int proc_id_map_open(struct inode *inode, struct file *file, | |
ccf94f1b | 2708 | const struct seq_operations *seq_ops) |
22d917d8 EB |
2709 | { |
2710 | struct user_namespace *ns = NULL; | |
2711 | struct task_struct *task; | |
2712 | struct seq_file *seq; | |
2713 | int ret = -EINVAL; | |
2714 | ||
2715 | task = get_proc_task(inode); | |
2716 | if (task) { | |
2717 | rcu_read_lock(); | |
2718 | ns = get_user_ns(task_cred_xxx(task, user_ns)); | |
2719 | rcu_read_unlock(); | |
2720 | put_task_struct(task); | |
2721 | } | |
2722 | if (!ns) | |
2723 | goto err; | |
2724 | ||
2725 | ret = seq_open(file, seq_ops); | |
2726 | if (ret) | |
2727 | goto err_put_ns; | |
2728 | ||
2729 | seq = file->private_data; | |
2730 | seq->private = ns; | |
2731 | ||
2732 | return 0; | |
2733 | err_put_ns: | |
2734 | put_user_ns(ns); | |
2735 | err: | |
2736 | return ret; | |
2737 | } | |
2738 | ||
2739 | static int proc_id_map_release(struct inode *inode, struct file *file) | |
2740 | { | |
2741 | struct seq_file *seq = file->private_data; | |
2742 | struct user_namespace *ns = seq->private; | |
2743 | put_user_ns(ns); | |
2744 | return seq_release(inode, file); | |
2745 | } | |
2746 | ||
2747 | static int proc_uid_map_open(struct inode *inode, struct file *file) | |
2748 | { | |
2749 | return proc_id_map_open(inode, file, &proc_uid_seq_operations); | |
2750 | } | |
2751 | ||
2752 | static int proc_gid_map_open(struct inode *inode, struct file *file) | |
2753 | { | |
2754 | return proc_id_map_open(inode, file, &proc_gid_seq_operations); | |
2755 | } | |
2756 | ||
f76d207a EB |
2757 | static int proc_projid_map_open(struct inode *inode, struct file *file) |
2758 | { | |
2759 | return proc_id_map_open(inode, file, &proc_projid_seq_operations); | |
2760 | } | |
2761 | ||
22d917d8 EB |
2762 | static const struct file_operations proc_uid_map_operations = { |
2763 | .open = proc_uid_map_open, | |
2764 | .write = proc_uid_map_write, | |
2765 | .read = seq_read, | |
2766 | .llseek = seq_lseek, | |
2767 | .release = proc_id_map_release, | |
2768 | }; | |
2769 | ||
2770 | static const struct file_operations proc_gid_map_operations = { | |
2771 | .open = proc_gid_map_open, | |
2772 | .write = proc_gid_map_write, | |
2773 | .read = seq_read, | |
2774 | .llseek = seq_lseek, | |
2775 | .release = proc_id_map_release, | |
2776 | }; | |
f76d207a EB |
2777 | |
2778 | static const struct file_operations proc_projid_map_operations = { | |
2779 | .open = proc_projid_map_open, | |
2780 | .write = proc_projid_map_write, | |
2781 | .read = seq_read, | |
2782 | .llseek = seq_lseek, | |
2783 | .release = proc_id_map_release, | |
2784 | }; | |
9cc46516 EB |
2785 | |
2786 | static int proc_setgroups_open(struct inode *inode, struct file *file) | |
2787 | { | |
2788 | struct user_namespace *ns = NULL; | |
2789 | struct task_struct *task; | |
2790 | int ret; | |
2791 | ||
2792 | ret = -ESRCH; | |
2793 | task = get_proc_task(inode); | |
2794 | if (task) { | |
2795 | rcu_read_lock(); | |
2796 | ns = get_user_ns(task_cred_xxx(task, user_ns)); | |
2797 | rcu_read_unlock(); | |
2798 | put_task_struct(task); | |
2799 | } | |
2800 | if (!ns) | |
2801 | goto err; | |
2802 | ||
2803 | if (file->f_mode & FMODE_WRITE) { | |
2804 | ret = -EACCES; | |
2805 | if (!ns_capable(ns, CAP_SYS_ADMIN)) | |
2806 | goto err_put_ns; | |
2807 | } | |
2808 | ||
2809 | ret = single_open(file, &proc_setgroups_show, ns); | |
2810 | if (ret) | |
2811 | goto err_put_ns; | |
2812 | ||
2813 | return 0; | |
2814 | err_put_ns: | |
2815 | put_user_ns(ns); | |
2816 | err: | |
2817 | return ret; | |
2818 | } | |
2819 | ||
2820 | static int proc_setgroups_release(struct inode *inode, struct file *file) | |
2821 | { | |
2822 | struct seq_file *seq = file->private_data; | |
2823 | struct user_namespace *ns = seq->private; | |
2824 | int ret = single_release(inode, file); | |
2825 | put_user_ns(ns); | |
2826 | return ret; | |
2827 | } | |
2828 | ||
2829 | static const struct file_operations proc_setgroups_operations = { | |
2830 | .open = proc_setgroups_open, | |
2831 | .write = proc_setgroups_write, | |
2832 | .read = seq_read, | |
2833 | .llseek = seq_lseek, | |
2834 | .release = proc_setgroups_release, | |
2835 | }; | |
22d917d8 EB |
2836 | #endif /* CONFIG_USER_NS */ |
2837 | ||
47830723 KC |
2838 | static int proc_pid_personality(struct seq_file *m, struct pid_namespace *ns, |
2839 | struct pid *pid, struct task_struct *task) | |
2840 | { | |
a9712bc1 AV |
2841 | int err = lock_trace(task); |
2842 | if (!err) { | |
2843 | seq_printf(m, "%08x\n", task->personality); | |
2844 | unlock_trace(task); | |
2845 | } | |
2846 | return err; | |
47830723 KC |
2847 | } |
2848 | ||
28a6d671 EB |
2849 | /* |
2850 | * Thread groups | |
2851 | */ | |
00977a59 | 2852 | static const struct file_operations proc_task_operations; |
c5ef1c42 | 2853 | static const struct inode_operations proc_task_inode_operations; |
20cdc894 | 2854 | |
c5141e6d | 2855 | static const struct pid_entry tgid_base_stuff[] = { |
631f9c18 AD |
2856 | DIR("task", S_IRUGO|S_IXUGO, proc_task_inode_operations, proc_task_operations), |
2857 | DIR("fd", S_IRUSR|S_IXUSR, proc_fd_inode_operations, proc_fd_operations), | |
640708a2 | 2858 | DIR("map_files", S_IRUSR|S_IXUSR, proc_map_files_inode_operations, proc_map_files_operations), |
631f9c18 | 2859 | DIR("fdinfo", S_IRUSR|S_IXUSR, proc_fdinfo_inode_operations, proc_fdinfo_operations), |
6b4e306a | 2860 | DIR("ns", S_IRUSR|S_IXUGO, proc_ns_dir_inode_operations, proc_ns_dir_operations), |
b2211a36 | 2861 | #ifdef CONFIG_NET |
631f9c18 | 2862 | DIR("net", S_IRUGO|S_IXUGO, proc_net_inode_operations, proc_net_operations), |
b2211a36 | 2863 | #endif |
631f9c18 | 2864 | REG("environ", S_IRUSR, proc_environ_operations), |
c5317167 | 2865 | REG("auxv", S_IRUSR, proc_auxv_operations), |
631f9c18 | 2866 | ONE("status", S_IRUGO, proc_pid_status), |
35a35046 | 2867 | ONE("personality", S_IRUSR, proc_pid_personality), |
1c963eb1 | 2868 | ONE("limits", S_IRUGO, proc_pid_limits), |
43ae34cb | 2869 | #ifdef CONFIG_SCHED_DEBUG |
631f9c18 | 2870 | REG("sched", S_IRUGO|S_IWUSR, proc_pid_sched_operations), |
5091faa4 MG |
2871 | #endif |
2872 | #ifdef CONFIG_SCHED_AUTOGROUP | |
2873 | REG("autogroup", S_IRUGO|S_IWUSR, proc_pid_sched_autogroup_operations), | |
ebcb6734 | 2874 | #endif |
4614a696 | 2875 | REG("comm", S_IRUGO|S_IWUSR, proc_pid_set_comm_operations), |
ebcb6734 | 2876 | #ifdef CONFIG_HAVE_ARCH_TRACEHOOK |
09d93bd6 | 2877 | ONE("syscall", S_IRUSR, proc_pid_syscall), |
43ae34cb | 2878 | #endif |
c2c0bb44 | 2879 | REG("cmdline", S_IRUGO, proc_pid_cmdline_ops), |
631f9c18 AD |
2880 | ONE("stat", S_IRUGO, proc_tgid_stat), |
2881 | ONE("statm", S_IRUGO, proc_pid_statm), | |
b7643757 | 2882 | REG("maps", S_IRUGO, proc_pid_maps_operations), |
28a6d671 | 2883 | #ifdef CONFIG_NUMA |
b7643757 | 2884 | REG("numa_maps", S_IRUGO, proc_pid_numa_maps_operations), |
28a6d671 | 2885 | #endif |
631f9c18 AD |
2886 | REG("mem", S_IRUSR|S_IWUSR, proc_mem_operations), |
2887 | LNK("cwd", proc_cwd_link), | |
2888 | LNK("root", proc_root_link), | |
2889 | LNK("exe", proc_exe_link), | |
2890 | REG("mounts", S_IRUGO, proc_mounts_operations), | |
2891 | REG("mountinfo", S_IRUGO, proc_mountinfo_operations), | |
2892 | REG("mountstats", S_IRUSR, proc_mountstats_operations), | |
1e883281 | 2893 | #ifdef CONFIG_PROC_PAGE_MONITOR |
631f9c18 | 2894 | REG("clear_refs", S_IWUSR, proc_clear_refs_operations), |
b7643757 | 2895 | REG("smaps", S_IRUGO, proc_pid_smaps_operations), |
32ed74a4 | 2896 | REG("pagemap", S_IRUSR, proc_pagemap_operations), |
28a6d671 EB |
2897 | #endif |
2898 | #ifdef CONFIG_SECURITY | |
631f9c18 | 2899 | DIR("attr", S_IRUGO|S_IXUGO, proc_attr_dir_inode_operations, proc_attr_dir_operations), |
28a6d671 EB |
2900 | #endif |
2901 | #ifdef CONFIG_KALLSYMS | |
edfcd606 | 2902 | ONE("wchan", S_IRUGO, proc_pid_wchan), |
28a6d671 | 2903 | #endif |
2ec220e2 | 2904 | #ifdef CONFIG_STACKTRACE |
35a35046 | 2905 | ONE("stack", S_IRUSR, proc_pid_stack), |
28a6d671 | 2906 | #endif |
5968cece | 2907 | #ifdef CONFIG_SCHED_INFO |
f6e826ca | 2908 | ONE("schedstat", S_IRUGO, proc_pid_schedstat), |
28a6d671 | 2909 | #endif |
9745512c | 2910 | #ifdef CONFIG_LATENCYTOP |
631f9c18 | 2911 | REG("latency", S_IRUGO, proc_lstats_operations), |
9745512c | 2912 | #endif |
8793d854 | 2913 | #ifdef CONFIG_PROC_PID_CPUSET |
52de4779 | 2914 | ONE("cpuset", S_IRUGO, proc_cpuset_show), |
a424316c PM |
2915 | #endif |
2916 | #ifdef CONFIG_CGROUPS | |
006f4ac4 | 2917 | ONE("cgroup", S_IRUGO, proc_cgroup_show), |
28a6d671 | 2918 | #endif |
6ba51e37 | 2919 | ONE("oom_score", S_IRUGO, proc_oom_score), |
fa0cbbf1 | 2920 | REG("oom_adj", S_IRUGO|S_IWUSR, proc_oom_adj_operations), |
a63d83f4 | 2921 | REG("oom_score_adj", S_IRUGO|S_IWUSR, proc_oom_score_adj_operations), |
28a6d671 | 2922 | #ifdef CONFIG_AUDITSYSCALL |
631f9c18 AD |
2923 | REG("loginuid", S_IWUSR|S_IRUGO, proc_loginuid_operations), |
2924 | REG("sessionid", S_IRUGO, proc_sessionid_operations), | |
28a6d671 | 2925 | #endif |
f4f154fd | 2926 | #ifdef CONFIG_FAULT_INJECTION |
631f9c18 | 2927 | REG("make-it-fail", S_IRUGO|S_IWUSR, proc_fault_inject_operations), |
f4f154fd | 2928 | #endif |
698ba7b5 | 2929 | #ifdef CONFIG_ELF_CORE |
631f9c18 | 2930 | REG("coredump_filter", S_IRUGO|S_IWUSR, proc_coredump_filter_operations), |
3cb4a0bb | 2931 | #endif |
aba76fdb | 2932 | #ifdef CONFIG_TASK_IO_ACCOUNTING |
19aadc98 | 2933 | ONE("io", S_IRUSR, proc_tgid_io_accounting), |
aba76fdb | 2934 | #endif |
f133ecca | 2935 | #ifdef CONFIG_HARDWALL |
d962c144 | 2936 | ONE("hardwall", S_IRUGO, proc_pid_hardwall), |
f133ecca | 2937 | #endif |
22d917d8 EB |
2938 | #ifdef CONFIG_USER_NS |
2939 | REG("uid_map", S_IRUGO|S_IWUSR, proc_uid_map_operations), | |
2940 | REG("gid_map", S_IRUGO|S_IWUSR, proc_gid_map_operations), | |
f76d207a | 2941 | REG("projid_map", S_IRUGO|S_IWUSR, proc_projid_map_operations), |
9cc46516 | 2942 | REG("setgroups", S_IRUGO|S_IWUSR, proc_setgroups_operations), |
22d917d8 | 2943 | #endif |
48f6a7a5 PE |
2944 | #ifdef CONFIG_CHECKPOINT_RESTORE |
2945 | REG("timers", S_IRUGO, proc_timers_operations), | |
2946 | #endif | |
5de23d43 | 2947 | REG("timerslack_ns", S_IRUGO|S_IWUGO, proc_pid_set_timerslack_ns_operations), |
28a6d671 | 2948 | }; |
1da177e4 | 2949 | |
f0c3b509 | 2950 | static int proc_tgid_base_readdir(struct file *file, struct dir_context *ctx) |
1da177e4 | 2951 | { |
f0c3b509 AV |
2952 | return proc_pident_readdir(file, ctx, |
2953 | tgid_base_stuff, ARRAY_SIZE(tgid_base_stuff)); | |
1da177e4 LT |
2954 | } |
2955 | ||
00977a59 | 2956 | static const struct file_operations proc_tgid_base_operations = { |
1da177e4 | 2957 | .read = generic_read_dir, |
f50752ea AV |
2958 | .iterate_shared = proc_tgid_base_readdir, |
2959 | .llseek = generic_file_llseek, | |
1da177e4 LT |
2960 | }; |
2961 | ||
00cd8dd3 AV |
2962 | static struct dentry *proc_tgid_base_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags) |
2963 | { | |
7bcd6b0e EB |
2964 | return proc_pident_lookup(dir, dentry, |
2965 | tgid_base_stuff, ARRAY_SIZE(tgid_base_stuff)); | |
1da177e4 LT |
2966 | } |
2967 | ||
c5ef1c42 | 2968 | static const struct inode_operations proc_tgid_base_inode_operations = { |
28a6d671 | 2969 | .lookup = proc_tgid_base_lookup, |
99f89551 | 2970 | .getattr = pid_getattr, |
6d76fa58 | 2971 | .setattr = proc_setattr, |
0499680a | 2972 | .permission = proc_pid_permission, |
1da177e4 | 2973 | }; |
1da177e4 | 2974 | |
60347f67 | 2975 | static void proc_flush_task_mnt(struct vfsmount *mnt, pid_t pid, pid_t tgid) |
1da177e4 | 2976 | { |
48e6484d | 2977 | struct dentry *dentry, *leader, *dir; |
8578cea7 | 2978 | char buf[PROC_NUMBUF]; |
48e6484d EB |
2979 | struct qstr name; |
2980 | ||
2981 | name.name = buf; | |
60347f67 | 2982 | name.len = snprintf(buf, sizeof(buf), "%d", pid); |
4f522a24 | 2983 | /* no ->d_hash() rejects on procfs */ |
60347f67 | 2984 | dentry = d_hash_and_lookup(mnt->mnt_root, &name); |
48e6484d | 2985 | if (dentry) { |
bbd51924 | 2986 | d_invalidate(dentry); |
48e6484d EB |
2987 | dput(dentry); |
2988 | } | |
1da177e4 | 2989 | |
c35a7f18 ON |
2990 | if (pid == tgid) |
2991 | return; | |
2992 | ||
48e6484d | 2993 | name.name = buf; |
60347f67 PE |
2994 | name.len = snprintf(buf, sizeof(buf), "%d", tgid); |
2995 | leader = d_hash_and_lookup(mnt->mnt_root, &name); | |
48e6484d EB |
2996 | if (!leader) |
2997 | goto out; | |
1da177e4 | 2998 | |
48e6484d EB |
2999 | name.name = "task"; |
3000 | name.len = strlen(name.name); | |
3001 | dir = d_hash_and_lookup(leader, &name); | |
3002 | if (!dir) | |
3003 | goto out_put_leader; | |
3004 | ||
3005 | name.name = buf; | |
60347f67 | 3006 | name.len = snprintf(buf, sizeof(buf), "%d", pid); |
48e6484d EB |
3007 | dentry = d_hash_and_lookup(dir, &name); |
3008 | if (dentry) { | |
bbd51924 | 3009 | d_invalidate(dentry); |
48e6484d | 3010 | dput(dentry); |
1da177e4 | 3011 | } |
48e6484d EB |
3012 | |
3013 | dput(dir); | |
3014 | out_put_leader: | |
3015 | dput(leader); | |
3016 | out: | |
3017 | return; | |
1da177e4 LT |
3018 | } |
3019 | ||
0895e91d RD |
3020 | /** |
3021 | * proc_flush_task - Remove dcache entries for @task from the /proc dcache. | |
3022 | * @task: task that should be flushed. | |
3023 | * | |
3024 | * When flushing dentries from proc, one needs to flush them from global | |
60347f67 | 3025 | * proc (proc_mnt) and from all the namespaces' procs this task was seen |
0895e91d RD |
3026 | * in. This call is supposed to do all of this job. |
3027 | * | |
3028 | * Looks in the dcache for | |
3029 | * /proc/@pid | |
3030 | * /proc/@tgid/task/@pid | |
3031 | * if either directory is present flushes it and all of it'ts children | |
3032 | * from the dcache. | |
3033 | * | |
3034 | * It is safe and reasonable to cache /proc entries for a task until | |
3035 | * that task exits. After that they just clog up the dcache with | |
3036 | * useless entries, possibly causing useful dcache entries to be | |
3037 | * flushed instead. This routine is proved to flush those useless | |
3038 | * dcache entries at process exit time. | |
3039 | * | |
3040 | * NOTE: This routine is just an optimization so it does not guarantee | |
3041 | * that no dcache entries will exist at process exit time it | |
3042 | * just makes it very unlikely that any will persist. | |
60347f67 PE |
3043 | */ |
3044 | ||
3045 | void proc_flush_task(struct task_struct *task) | |
3046 | { | |
9fcc2d15 | 3047 | int i; |
9b4d1cbe | 3048 | struct pid *pid, *tgid; |
130f77ec PE |
3049 | struct upid *upid; |
3050 | ||
130f77ec | 3051 | pid = task_pid(task); |
9b4d1cbe | 3052 | tgid = task_tgid(task); |
130f77ec | 3053 | |
9fcc2d15 | 3054 | for (i = 0; i <= pid->level; i++) { |
130f77ec PE |
3055 | upid = &pid->numbers[i]; |
3056 | proc_flush_task_mnt(upid->ns->proc_mnt, upid->nr, | |
9b4d1cbe | 3057 | tgid->numbers[i].nr); |
130f77ec | 3058 | } |
60347f67 PE |
3059 | } |
3060 | ||
c52a47ac AV |
3061 | static int proc_pid_instantiate(struct inode *dir, |
3062 | struct dentry * dentry, | |
3063 | struct task_struct *task, const void *ptr) | |
444ceed8 | 3064 | { |
444ceed8 EB |
3065 | struct inode *inode; |
3066 | ||
db978da8 | 3067 | inode = proc_pid_make_inode(dir->i_sb, task, S_IFDIR | S_IRUGO | S_IXUGO); |
444ceed8 EB |
3068 | if (!inode) |
3069 | goto out; | |
3070 | ||
444ceed8 EB |
3071 | inode->i_op = &proc_tgid_base_inode_operations; |
3072 | inode->i_fop = &proc_tgid_base_operations; | |
3073 | inode->i_flags|=S_IMMUTABLE; | |
aed54175 | 3074 | |
1270dd8d | 3075 | set_nlink(inode, nlink_tgid); |
444ceed8 | 3076 | |
fb045adb | 3077 | d_set_d_op(dentry, &pid_dentry_operations); |
444ceed8 EB |
3078 | |
3079 | d_add(dentry, inode); | |
3080 | /* Close the race of the process dying before we return the dentry */ | |
0b728e19 | 3081 | if (pid_revalidate(dentry, 0)) |
c52a47ac | 3082 | return 0; |
444ceed8 | 3083 | out: |
c52a47ac | 3084 | return -ENOENT; |
444ceed8 EB |
3085 | } |
3086 | ||
00cd8dd3 | 3087 | struct dentry *proc_pid_lookup(struct inode *dir, struct dentry * dentry, unsigned int flags) |
1da177e4 | 3088 | { |
335eb531 | 3089 | int result = -ENOENT; |
1da177e4 | 3090 | struct task_struct *task; |
1da177e4 | 3091 | unsigned tgid; |
b488893a | 3092 | struct pid_namespace *ns; |
1da177e4 | 3093 | |
dbcdb504 | 3094 | tgid = name_to_int(&dentry->d_name); |
1da177e4 LT |
3095 | if (tgid == ~0U) |
3096 | goto out; | |
3097 | ||
b488893a | 3098 | ns = dentry->d_sb->s_fs_info; |
de758734 | 3099 | rcu_read_lock(); |
b488893a | 3100 | task = find_task_by_pid_ns(tgid, ns); |
1da177e4 LT |
3101 | if (task) |
3102 | get_task_struct(task); | |
de758734 | 3103 | rcu_read_unlock(); |
1da177e4 LT |
3104 | if (!task) |
3105 | goto out; | |
3106 | ||
444ceed8 | 3107 | result = proc_pid_instantiate(dir, dentry, task, NULL); |
1da177e4 | 3108 | put_task_struct(task); |
1da177e4 | 3109 | out: |
c52a47ac | 3110 | return ERR_PTR(result); |
1da177e4 LT |
3111 | } |
3112 | ||
1da177e4 | 3113 | /* |
0804ef4b | 3114 | * Find the first task with tgid >= tgid |
0bc58a91 | 3115 | * |
1da177e4 | 3116 | */ |
19fd4bb2 EB |
3117 | struct tgid_iter { |
3118 | unsigned int tgid; | |
0804ef4b | 3119 | struct task_struct *task; |
19fd4bb2 EB |
3120 | }; |
3121 | static struct tgid_iter next_tgid(struct pid_namespace *ns, struct tgid_iter iter) | |
3122 | { | |
0804ef4b | 3123 | struct pid *pid; |
1da177e4 | 3124 | |
19fd4bb2 EB |
3125 | if (iter.task) |
3126 | put_task_struct(iter.task); | |
454cc105 | 3127 | rcu_read_lock(); |
0804ef4b | 3128 | retry: |
19fd4bb2 EB |
3129 | iter.task = NULL; |
3130 | pid = find_ge_pid(iter.tgid, ns); | |
0804ef4b | 3131 | if (pid) { |
19fd4bb2 EB |
3132 | iter.tgid = pid_nr_ns(pid, ns); |
3133 | iter.task = pid_task(pid, PIDTYPE_PID); | |
0804ef4b EB |
3134 | /* What we to know is if the pid we have find is the |
3135 | * pid of a thread_group_leader. Testing for task | |
3136 | * being a thread_group_leader is the obvious thing | |
3137 | * todo but there is a window when it fails, due to | |
3138 | * the pid transfer logic in de_thread. | |
3139 | * | |
3140 | * So we perform the straight forward test of seeing | |
3141 | * if the pid we have found is the pid of a thread | |
3142 | * group leader, and don't worry if the task we have | |
3143 | * found doesn't happen to be a thread group leader. | |
3144 | * As we don't care in the case of readdir. | |
3145 | */ | |
19fd4bb2 EB |
3146 | if (!iter.task || !has_group_leader_pid(iter.task)) { |
3147 | iter.tgid += 1; | |
0804ef4b | 3148 | goto retry; |
19fd4bb2 EB |
3149 | } |
3150 | get_task_struct(iter.task); | |
0bc58a91 | 3151 | } |
454cc105 | 3152 | rcu_read_unlock(); |
19fd4bb2 | 3153 | return iter; |
1da177e4 LT |
3154 | } |
3155 | ||
0097875b | 3156 | #define TGID_OFFSET (FIRST_PROCESS_ENTRY + 2) |
0804ef4b | 3157 | |
1da177e4 | 3158 | /* for the /proc/ directory itself, after non-process stuff has been done */ |
f0c3b509 | 3159 | int proc_pid_readdir(struct file *file, struct dir_context *ctx) |
1da177e4 | 3160 | { |
19fd4bb2 | 3161 | struct tgid_iter iter; |
3aa3377f | 3162 | struct pid_namespace *ns = file_inode(file)->i_sb->s_fs_info; |
f0c3b509 | 3163 | loff_t pos = ctx->pos; |
1da177e4 | 3164 | |
021ada7d | 3165 | if (pos >= PID_MAX_LIMIT + TGID_OFFSET) |
f0c3b509 | 3166 | return 0; |
1da177e4 | 3167 | |
0097875b | 3168 | if (pos == TGID_OFFSET - 2) { |
2b0143b5 | 3169 | struct inode *inode = d_inode(ns->proc_self); |
db963164 | 3170 | if (!dir_emit(ctx, "self", 4, inode->i_ino, DT_LNK)) |
f0c3b509 | 3171 | return 0; |
0097875b EB |
3172 | ctx->pos = pos = pos + 1; |
3173 | } | |
3174 | if (pos == TGID_OFFSET - 1) { | |
2b0143b5 | 3175 | struct inode *inode = d_inode(ns->proc_thread_self); |
0097875b EB |
3176 | if (!dir_emit(ctx, "thread-self", 11, inode->i_ino, DT_LNK)) |
3177 | return 0; | |
3178 | ctx->pos = pos = pos + 1; | |
021ada7d | 3179 | } |
0097875b | 3180 | iter.tgid = pos - TGID_OFFSET; |
19fd4bb2 | 3181 | iter.task = NULL; |
19fd4bb2 EB |
3182 | for (iter = next_tgid(ns, iter); |
3183 | iter.task; | |
3184 | iter.tgid += 1, iter = next_tgid(ns, iter)) { | |
f0c3b509 AV |
3185 | char name[PROC_NUMBUF]; |
3186 | int len; | |
3187 | if (!has_pid_permissions(ns, iter.task, 2)) | |
3188 | continue; | |
0499680a | 3189 | |
f0c3b509 AV |
3190 | len = snprintf(name, sizeof(name), "%d", iter.tgid); |
3191 | ctx->pos = iter.tgid + TGID_OFFSET; | |
3192 | if (!proc_fill_cache(file, ctx, name, len, | |
3193 | proc_pid_instantiate, iter.task, NULL)) { | |
19fd4bb2 | 3194 | put_task_struct(iter.task); |
f0c3b509 | 3195 | return 0; |
1da177e4 | 3196 | } |
0bc58a91 | 3197 | } |
f0c3b509 | 3198 | ctx->pos = PID_MAX_LIMIT + TGID_OFFSET; |
0bc58a91 EB |
3199 | return 0; |
3200 | } | |
1da177e4 | 3201 | |
1b3044e3 JD |
3202 | /* |
3203 | * proc_tid_comm_permission is a special permission function exclusively | |
3204 | * used for the node /proc/<pid>/task/<tid>/comm. | |
3205 | * It bypasses generic permission checks in the case where a task of the same | |
3206 | * task group attempts to access the node. | |
3207 | * The rationale behind this is that glibc and bionic access this node for | |
3208 | * cross thread naming (pthread_set/getname_np(!self)). However, if | |
3209 | * PR_SET_DUMPABLE gets set to 0 this node among others becomes uid=0 gid=0, | |
3210 | * which locks out the cross thread naming implementation. | |
3211 | * This function makes sure that the node is always accessible for members of | |
3212 | * same thread group. | |
3213 | */ | |
3214 | static int proc_tid_comm_permission(struct inode *inode, int mask) | |
3215 | { | |
3216 | bool is_same_tgroup; | |
3217 | struct task_struct *task; | |
3218 | ||
3219 | task = get_proc_task(inode); | |
3220 | if (!task) | |
3221 | return -ESRCH; | |
3222 | is_same_tgroup = same_thread_group(current, task); | |
3223 | put_task_struct(task); | |
3224 | ||
3225 | if (likely(is_same_tgroup && !(mask & MAY_EXEC))) { | |
3226 | /* This file (/proc/<pid>/task/<tid>/comm) can always be | |
3227 | * read or written by the members of the corresponding | |
3228 | * thread group. | |
3229 | */ | |
3230 | return 0; | |
3231 | } | |
3232 | ||
3233 | return generic_permission(inode, mask); | |
3234 | } | |
3235 | ||
3236 | static const struct inode_operations proc_tid_comm_inode_operations = { | |
3237 | .permission = proc_tid_comm_permission, | |
3238 | }; | |
3239 | ||
28a6d671 EB |
3240 | /* |
3241 | * Tasks | |
3242 | */ | |
c5141e6d | 3243 | static const struct pid_entry tid_base_stuff[] = { |
631f9c18 | 3244 | DIR("fd", S_IRUSR|S_IXUSR, proc_fd_inode_operations, proc_fd_operations), |
3835541d | 3245 | DIR("fdinfo", S_IRUSR|S_IXUSR, proc_fdinfo_inode_operations, proc_fdinfo_operations), |
6b4e306a | 3246 | DIR("ns", S_IRUSR|S_IXUGO, proc_ns_dir_inode_operations, proc_ns_dir_operations), |
6ba8ed79 EB |
3247 | #ifdef CONFIG_NET |
3248 | DIR("net", S_IRUGO|S_IXUGO, proc_net_inode_operations, proc_net_operations), | |
3249 | #endif | |
631f9c18 | 3250 | REG("environ", S_IRUSR, proc_environ_operations), |
c5317167 | 3251 | REG("auxv", S_IRUSR, proc_auxv_operations), |
631f9c18 | 3252 | ONE("status", S_IRUGO, proc_pid_status), |
35a35046 | 3253 | ONE("personality", S_IRUSR, proc_pid_personality), |
1c963eb1 | 3254 | ONE("limits", S_IRUGO, proc_pid_limits), |
43ae34cb | 3255 | #ifdef CONFIG_SCHED_DEBUG |
631f9c18 | 3256 | REG("sched", S_IRUGO|S_IWUSR, proc_pid_sched_operations), |
ebcb6734 | 3257 | #endif |
1b3044e3 JD |
3258 | NOD("comm", S_IFREG|S_IRUGO|S_IWUSR, |
3259 | &proc_tid_comm_inode_operations, | |
3260 | &proc_pid_set_comm_operations, {}), | |
ebcb6734 | 3261 | #ifdef CONFIG_HAVE_ARCH_TRACEHOOK |
09d93bd6 | 3262 | ONE("syscall", S_IRUSR, proc_pid_syscall), |
43ae34cb | 3263 | #endif |
c2c0bb44 | 3264 | REG("cmdline", S_IRUGO, proc_pid_cmdline_ops), |
631f9c18 AD |
3265 | ONE("stat", S_IRUGO, proc_tid_stat), |
3266 | ONE("statm", S_IRUGO, proc_pid_statm), | |
b7643757 | 3267 | REG("maps", S_IRUGO, proc_tid_maps_operations), |
2e13ba54 | 3268 | #ifdef CONFIG_PROC_CHILDREN |
81841161 CG |
3269 | REG("children", S_IRUGO, proc_tid_children_operations), |
3270 | #endif | |
28a6d671 | 3271 | #ifdef CONFIG_NUMA |
b7643757 | 3272 | REG("numa_maps", S_IRUGO, proc_tid_numa_maps_operations), |
28a6d671 | 3273 | #endif |
631f9c18 AD |
3274 | REG("mem", S_IRUSR|S_IWUSR, proc_mem_operations), |
3275 | LNK("cwd", proc_cwd_link), | |
3276 | LNK("root", proc_root_link), | |
3277 | LNK("exe", proc_exe_link), | |
3278 | REG("mounts", S_IRUGO, proc_mounts_operations), | |
3279 | REG("mountinfo", S_IRUGO, proc_mountinfo_operations), | |
1e883281 | 3280 | #ifdef CONFIG_PROC_PAGE_MONITOR |
631f9c18 | 3281 | REG("clear_refs", S_IWUSR, proc_clear_refs_operations), |
b7643757 | 3282 | REG("smaps", S_IRUGO, proc_tid_smaps_operations), |
32ed74a4 | 3283 | REG("pagemap", S_IRUSR, proc_pagemap_operations), |
28a6d671 EB |
3284 | #endif |
3285 | #ifdef CONFIG_SECURITY | |
631f9c18 | 3286 | DIR("attr", S_IRUGO|S_IXUGO, proc_attr_dir_inode_operations, proc_attr_dir_operations), |
28a6d671 EB |
3287 | #endif |
3288 | #ifdef CONFIG_KALLSYMS | |
edfcd606 | 3289 | ONE("wchan", S_IRUGO, proc_pid_wchan), |
28a6d671 | 3290 | #endif |
2ec220e2 | 3291 | #ifdef CONFIG_STACKTRACE |
35a35046 | 3292 | ONE("stack", S_IRUSR, proc_pid_stack), |
28a6d671 | 3293 | #endif |
5968cece | 3294 | #ifdef CONFIG_SCHED_INFO |
f6e826ca | 3295 | ONE("schedstat", S_IRUGO, proc_pid_schedstat), |
28a6d671 | 3296 | #endif |
9745512c | 3297 | #ifdef CONFIG_LATENCYTOP |
631f9c18 | 3298 | REG("latency", S_IRUGO, proc_lstats_operations), |
9745512c | 3299 | #endif |
8793d854 | 3300 | #ifdef CONFIG_PROC_PID_CPUSET |
52de4779 | 3301 | ONE("cpuset", S_IRUGO, proc_cpuset_show), |
a424316c PM |
3302 | #endif |
3303 | #ifdef CONFIG_CGROUPS | |
006f4ac4 | 3304 | ONE("cgroup", S_IRUGO, proc_cgroup_show), |
28a6d671 | 3305 | #endif |
6ba51e37 | 3306 | ONE("oom_score", S_IRUGO, proc_oom_score), |
fa0cbbf1 | 3307 | REG("oom_adj", S_IRUGO|S_IWUSR, proc_oom_adj_operations), |
a63d83f4 | 3308 | REG("oom_score_adj", S_IRUGO|S_IWUSR, proc_oom_score_adj_operations), |
28a6d671 | 3309 | #ifdef CONFIG_AUDITSYSCALL |
631f9c18 | 3310 | REG("loginuid", S_IWUSR|S_IRUGO, proc_loginuid_operations), |
26ec3c64 | 3311 | REG("sessionid", S_IRUGO, proc_sessionid_operations), |
28a6d671 | 3312 | #endif |
f4f154fd | 3313 | #ifdef CONFIG_FAULT_INJECTION |
631f9c18 | 3314 | REG("make-it-fail", S_IRUGO|S_IWUSR, proc_fault_inject_operations), |
f4f154fd | 3315 | #endif |
297c5d92 | 3316 | #ifdef CONFIG_TASK_IO_ACCOUNTING |
19aadc98 | 3317 | ONE("io", S_IRUSR, proc_tid_io_accounting), |
297c5d92 | 3318 | #endif |
f133ecca | 3319 | #ifdef CONFIG_HARDWALL |
d962c144 | 3320 | ONE("hardwall", S_IRUGO, proc_pid_hardwall), |
f133ecca | 3321 | #endif |
22d917d8 EB |
3322 | #ifdef CONFIG_USER_NS |
3323 | REG("uid_map", S_IRUGO|S_IWUSR, proc_uid_map_operations), | |
3324 | REG("gid_map", S_IRUGO|S_IWUSR, proc_gid_map_operations), | |
f76d207a | 3325 | REG("projid_map", S_IRUGO|S_IWUSR, proc_projid_map_operations), |
9cc46516 | 3326 | REG("setgroups", S_IRUGO|S_IWUSR, proc_setgroups_operations), |
22d917d8 | 3327 | #endif |
28a6d671 EB |
3328 | }; |
3329 | ||
f0c3b509 | 3330 | static int proc_tid_base_readdir(struct file *file, struct dir_context *ctx) |
28a6d671 | 3331 | { |
f0c3b509 AV |
3332 | return proc_pident_readdir(file, ctx, |
3333 | tid_base_stuff, ARRAY_SIZE(tid_base_stuff)); | |
28a6d671 EB |
3334 | } |
3335 | ||
00cd8dd3 AV |
3336 | static struct dentry *proc_tid_base_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags) |
3337 | { | |
7bcd6b0e EB |
3338 | return proc_pident_lookup(dir, dentry, |
3339 | tid_base_stuff, ARRAY_SIZE(tid_base_stuff)); | |
28a6d671 EB |
3340 | } |
3341 | ||
00977a59 | 3342 | static const struct file_operations proc_tid_base_operations = { |
28a6d671 | 3343 | .read = generic_read_dir, |
f50752ea AV |
3344 | .iterate_shared = proc_tid_base_readdir, |
3345 | .llseek = generic_file_llseek, | |
28a6d671 EB |
3346 | }; |
3347 | ||
c5ef1c42 | 3348 | static const struct inode_operations proc_tid_base_inode_operations = { |
28a6d671 EB |
3349 | .lookup = proc_tid_base_lookup, |
3350 | .getattr = pid_getattr, | |
3351 | .setattr = proc_setattr, | |
3352 | }; | |
3353 | ||
c52a47ac | 3354 | static int proc_task_instantiate(struct inode *dir, |
c5141e6d | 3355 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
444ceed8 | 3356 | { |
444ceed8 | 3357 | struct inode *inode; |
db978da8 | 3358 | inode = proc_pid_make_inode(dir->i_sb, task, S_IFDIR | S_IRUGO | S_IXUGO); |
444ceed8 EB |
3359 | |
3360 | if (!inode) | |
3361 | goto out; | |
444ceed8 EB |
3362 | inode->i_op = &proc_tid_base_inode_operations; |
3363 | inode->i_fop = &proc_tid_base_operations; | |
3364 | inode->i_flags|=S_IMMUTABLE; | |
aed54175 | 3365 | |
1270dd8d | 3366 | set_nlink(inode, nlink_tid); |
444ceed8 | 3367 | |
fb045adb | 3368 | d_set_d_op(dentry, &pid_dentry_operations); |
444ceed8 EB |
3369 | |
3370 | d_add(dentry, inode); | |
3371 | /* Close the race of the process dying before we return the dentry */ | |
0b728e19 | 3372 | if (pid_revalidate(dentry, 0)) |
c52a47ac | 3373 | return 0; |
444ceed8 | 3374 | out: |
c52a47ac | 3375 | return -ENOENT; |
444ceed8 EB |
3376 | } |
3377 | ||
00cd8dd3 | 3378 | static struct dentry *proc_task_lookup(struct inode *dir, struct dentry * dentry, unsigned int flags) |
28a6d671 | 3379 | { |
c52a47ac | 3380 | int result = -ENOENT; |
28a6d671 EB |
3381 | struct task_struct *task; |
3382 | struct task_struct *leader = get_proc_task(dir); | |
28a6d671 | 3383 | unsigned tid; |
b488893a | 3384 | struct pid_namespace *ns; |
28a6d671 EB |
3385 | |
3386 | if (!leader) | |
3387 | goto out_no_task; | |
3388 | ||
dbcdb504 | 3389 | tid = name_to_int(&dentry->d_name); |
28a6d671 EB |
3390 | if (tid == ~0U) |
3391 | goto out; | |
3392 | ||
b488893a | 3393 | ns = dentry->d_sb->s_fs_info; |
28a6d671 | 3394 | rcu_read_lock(); |
b488893a | 3395 | task = find_task_by_pid_ns(tid, ns); |
28a6d671 EB |
3396 | if (task) |
3397 | get_task_struct(task); | |
3398 | rcu_read_unlock(); | |
3399 | if (!task) | |
3400 | goto out; | |
bac0abd6 | 3401 | if (!same_thread_group(leader, task)) |
28a6d671 EB |
3402 | goto out_drop_task; |
3403 | ||
444ceed8 | 3404 | result = proc_task_instantiate(dir, dentry, task, NULL); |
28a6d671 EB |
3405 | out_drop_task: |
3406 | put_task_struct(task); | |
3407 | out: | |
3408 | put_task_struct(leader); | |
3409 | out_no_task: | |
c52a47ac | 3410 | return ERR_PTR(result); |
28a6d671 EB |
3411 | } |
3412 | ||
0bc58a91 EB |
3413 | /* |
3414 | * Find the first tid of a thread group to return to user space. | |
3415 | * | |
3416 | * Usually this is just the thread group leader, but if the users | |
3417 | * buffer was too small or there was a seek into the middle of the | |
3418 | * directory we have more work todo. | |
3419 | * | |
3420 | * In the case of a short read we start with find_task_by_pid. | |
3421 | * | |
3422 | * In the case of a seek we start with the leader and walk nr | |
3423 | * threads past it. | |
3424 | */ | |
9f6e963f ON |
3425 | static struct task_struct *first_tid(struct pid *pid, int tid, loff_t f_pos, |
3426 | struct pid_namespace *ns) | |
0bc58a91 | 3427 | { |
d855a4b7 | 3428 | struct task_struct *pos, *task; |
9f6e963f ON |
3429 | unsigned long nr = f_pos; |
3430 | ||
3431 | if (nr != f_pos) /* 32bit overflow? */ | |
3432 | return NULL; | |
1da177e4 | 3433 | |
cc288738 | 3434 | rcu_read_lock(); |
d855a4b7 ON |
3435 | task = pid_task(pid, PIDTYPE_PID); |
3436 | if (!task) | |
3437 | goto fail; | |
3438 | ||
3439 | /* Attempt to start with the tid of a thread */ | |
9f6e963f | 3440 | if (tid && nr) { |
b488893a | 3441 | pos = find_task_by_pid_ns(tid, ns); |
d855a4b7 | 3442 | if (pos && same_thread_group(pos, task)) |
a872ff0c | 3443 | goto found; |
0bc58a91 | 3444 | } |
1da177e4 | 3445 | |
0bc58a91 | 3446 | /* If nr exceeds the number of threads there is nothing todo */ |
9f6e963f | 3447 | if (nr >= get_nr_threads(task)) |
c986c14a | 3448 | goto fail; |
1da177e4 | 3449 | |
a872ff0c ON |
3450 | /* If we haven't found our starting place yet start |
3451 | * with the leader and walk nr threads forward. | |
0bc58a91 | 3452 | */ |
d855a4b7 | 3453 | pos = task = task->group_leader; |
c986c14a | 3454 | do { |
9f6e963f | 3455 | if (!nr--) |
c986c14a | 3456 | goto found; |
d855a4b7 | 3457 | } while_each_thread(task, pos); |
c986c14a ON |
3458 | fail: |
3459 | pos = NULL; | |
3460 | goto out; | |
a872ff0c ON |
3461 | found: |
3462 | get_task_struct(pos); | |
3463 | out: | |
cc288738 | 3464 | rcu_read_unlock(); |
0bc58a91 EB |
3465 | return pos; |
3466 | } | |
3467 | ||
3468 | /* | |
3469 | * Find the next thread in the thread list. | |
3470 | * Return NULL if there is an error or no next thread. | |
3471 | * | |
3472 | * The reference to the input task_struct is released. | |
3473 | */ | |
3474 | static struct task_struct *next_tid(struct task_struct *start) | |
3475 | { | |
c1df7fb8 | 3476 | struct task_struct *pos = NULL; |
cc288738 | 3477 | rcu_read_lock(); |
c1df7fb8 | 3478 | if (pid_alive(start)) { |
0bc58a91 | 3479 | pos = next_thread(start); |
c1df7fb8 ON |
3480 | if (thread_group_leader(pos)) |
3481 | pos = NULL; | |
3482 | else | |
3483 | get_task_struct(pos); | |
3484 | } | |
cc288738 | 3485 | rcu_read_unlock(); |
0bc58a91 EB |
3486 | put_task_struct(start); |
3487 | return pos; | |
1da177e4 LT |
3488 | } |
3489 | ||
3490 | /* for the /proc/TGID/task/ directories */ | |
f0c3b509 | 3491 | static int proc_task_readdir(struct file *file, struct dir_context *ctx) |
1da177e4 | 3492 | { |
d855a4b7 ON |
3493 | struct inode *inode = file_inode(file); |
3494 | struct task_struct *task; | |
b488893a | 3495 | struct pid_namespace *ns; |
f0c3b509 | 3496 | int tid; |
1da177e4 | 3497 | |
d855a4b7 | 3498 | if (proc_inode_is_dead(inode)) |
f0c3b509 | 3499 | return -ENOENT; |
1da177e4 | 3500 | |
f0c3b509 | 3501 | if (!dir_emit_dots(file, ctx)) |
d855a4b7 | 3502 | return 0; |
1da177e4 | 3503 | |
0bc58a91 EB |
3504 | /* f_version caches the tgid value that the last readdir call couldn't |
3505 | * return. lseek aka telldir automagically resets f_version to 0. | |
3506 | */ | |
3aa3377f | 3507 | ns = inode->i_sb->s_fs_info; |
f0c3b509 AV |
3508 | tid = (int)file->f_version; |
3509 | file->f_version = 0; | |
d855a4b7 | 3510 | for (task = first_tid(proc_pid(inode), tid, ctx->pos - 2, ns); |
0bc58a91 | 3511 | task; |
f0c3b509 AV |
3512 | task = next_tid(task), ctx->pos++) { |
3513 | char name[PROC_NUMBUF]; | |
3514 | int len; | |
b488893a | 3515 | tid = task_pid_nr_ns(task, ns); |
f0c3b509 AV |
3516 | len = snprintf(name, sizeof(name), "%d", tid); |
3517 | if (!proc_fill_cache(file, ctx, name, len, | |
3518 | proc_task_instantiate, task, NULL)) { | |
0bc58a91 EB |
3519 | /* returning this tgid failed, save it as the first |
3520 | * pid for the next readir call */ | |
f0c3b509 | 3521 | file->f_version = (u64)tid; |
0bc58a91 | 3522 | put_task_struct(task); |
1da177e4 | 3523 | break; |
0bc58a91 | 3524 | } |
1da177e4 | 3525 | } |
d855a4b7 | 3526 | |
f0c3b509 | 3527 | return 0; |
1da177e4 | 3528 | } |
6e66b52b EB |
3529 | |
3530 | static int proc_task_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) | |
3531 | { | |
2b0143b5 | 3532 | struct inode *inode = d_inode(dentry); |
99f89551 | 3533 | struct task_struct *p = get_proc_task(inode); |
6e66b52b EB |
3534 | generic_fillattr(inode, stat); |
3535 | ||
99f89551 | 3536 | if (p) { |
99f89551 | 3537 | stat->nlink += get_nr_threads(p); |
99f89551 | 3538 | put_task_struct(p); |
6e66b52b EB |
3539 | } |
3540 | ||
3541 | return 0; | |
3542 | } | |
28a6d671 | 3543 | |
c5ef1c42 | 3544 | static const struct inode_operations proc_task_inode_operations = { |
28a6d671 EB |
3545 | .lookup = proc_task_lookup, |
3546 | .getattr = proc_task_getattr, | |
3547 | .setattr = proc_setattr, | |
0499680a | 3548 | .permission = proc_pid_permission, |
28a6d671 EB |
3549 | }; |
3550 | ||
00977a59 | 3551 | static const struct file_operations proc_task_operations = { |
28a6d671 | 3552 | .read = generic_read_dir, |
f50752ea AV |
3553 | .iterate_shared = proc_task_readdir, |
3554 | .llseek = generic_file_llseek, | |
28a6d671 | 3555 | }; |
1270dd8d AD |
3556 | |
3557 | void __init set_proc_pid_nlink(void) | |
3558 | { | |
3559 | nlink_tid = pid_entry_nlink(tid_base_stuff, ARRAY_SIZE(tid_base_stuff)); | |
3560 | nlink_tgid = pid_entry_nlink(tgid_base_stuff, ARRAY_SIZE(tgid_base_stuff)); | |
3561 | } |