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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 | ||
50 | #include <asm/uaccess.h> | |
51 | ||
1da177e4 LT |
52 | #include <linux/errno.h> |
53 | #include <linux/time.h> | |
54 | #include <linux/proc_fs.h> | |
55 | #include <linux/stat.h> | |
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 | ||
1da177e4 | 107 | struct pid_entry { |
cedbccab | 108 | const char *name; |
c5141e6d | 109 | int len; |
d161a13f | 110 | umode_t mode; |
c5ef1c42 | 111 | const struct inode_operations *iop; |
00977a59 | 112 | const struct file_operations *fop; |
20cdc894 | 113 | union proc_op op; |
1da177e4 LT |
114 | }; |
115 | ||
61a28784 | 116 | #define NOD(NAME, MODE, IOP, FOP, OP) { \ |
20cdc894 | 117 | .name = (NAME), \ |
c5141e6d | 118 | .len = sizeof(NAME) - 1, \ |
20cdc894 EB |
119 | .mode = MODE, \ |
120 | .iop = IOP, \ | |
121 | .fop = FOP, \ | |
122 | .op = OP, \ | |
123 | } | |
124 | ||
631f9c18 AD |
125 | #define DIR(NAME, MODE, iops, fops) \ |
126 | NOD(NAME, (S_IFDIR|(MODE)), &iops, &fops, {} ) | |
127 | #define LNK(NAME, get_link) \ | |
61a28784 | 128 | NOD(NAME, (S_IFLNK|S_IRWXUGO), \ |
20cdc894 | 129 | &proc_pid_link_inode_operations, NULL, \ |
631f9c18 AD |
130 | { .proc_get_link = get_link } ) |
131 | #define REG(NAME, MODE, fops) \ | |
132 | NOD(NAME, (S_IFREG|(MODE)), NULL, &fops, {}) | |
631f9c18 | 133 | #define ONE(NAME, MODE, show) \ |
be614086 EB |
134 | NOD(NAME, (S_IFREG|(MODE)), \ |
135 | NULL, &proc_single_file_operations, \ | |
631f9c18 | 136 | { .proc_show = show } ) |
1da177e4 | 137 | |
aed54175 VN |
138 | /* |
139 | * Count the number of hardlinks for the pid_entry table, excluding the . | |
140 | * and .. links. | |
141 | */ | |
142 | static unsigned int pid_entry_count_dirs(const struct pid_entry *entries, | |
143 | unsigned int n) | |
144 | { | |
145 | unsigned int i; | |
146 | unsigned int count; | |
147 | ||
148 | count = 0; | |
149 | for (i = 0; i < n; ++i) { | |
150 | if (S_ISDIR(entries[i].mode)) | |
151 | ++count; | |
152 | } | |
153 | ||
154 | return count; | |
155 | } | |
156 | ||
f7ad3c6b | 157 | static int get_task_root(struct task_struct *task, struct path *root) |
1da177e4 | 158 | { |
7c2c7d99 HD |
159 | int result = -ENOENT; |
160 | ||
0494f6ec | 161 | task_lock(task); |
f7ad3c6b MS |
162 | if (task->fs) { |
163 | get_fs_root(task->fs, root); | |
7c2c7d99 HD |
164 | result = 0; |
165 | } | |
0494f6ec | 166 | task_unlock(task); |
7c2c7d99 | 167 | return result; |
0494f6ec MS |
168 | } |
169 | ||
7773fbc5 | 170 | static int proc_cwd_link(struct dentry *dentry, struct path *path) |
0494f6ec | 171 | { |
2b0143b5 | 172 | struct task_struct *task = get_proc_task(d_inode(dentry)); |
0494f6ec | 173 | int result = -ENOENT; |
99f89551 EB |
174 | |
175 | if (task) { | |
f7ad3c6b MS |
176 | task_lock(task); |
177 | if (task->fs) { | |
178 | get_fs_pwd(task->fs, path); | |
179 | result = 0; | |
180 | } | |
181 | task_unlock(task); | |
99f89551 EB |
182 | put_task_struct(task); |
183 | } | |
1da177e4 LT |
184 | return result; |
185 | } | |
186 | ||
7773fbc5 | 187 | static int proc_root_link(struct dentry *dentry, struct path *path) |
1da177e4 | 188 | { |
2b0143b5 | 189 | struct task_struct *task = get_proc_task(d_inode(dentry)); |
1da177e4 | 190 | int result = -ENOENT; |
99f89551 EB |
191 | |
192 | if (task) { | |
f7ad3c6b | 193 | result = get_task_root(task, path); |
99f89551 EB |
194 | put_task_struct(task); |
195 | } | |
1da177e4 LT |
196 | return result; |
197 | } | |
198 | ||
c2c0bb44 AD |
199 | static ssize_t proc_pid_cmdline_read(struct file *file, char __user *buf, |
200 | size_t _count, loff_t *pos) | |
1da177e4 | 201 | { |
c2c0bb44 AD |
202 | struct task_struct *tsk; |
203 | struct mm_struct *mm; | |
204 | char *page; | |
205 | unsigned long count = _count; | |
206 | unsigned long arg_start, arg_end, env_start, env_end; | |
207 | unsigned long len1, len2, len; | |
208 | unsigned long p; | |
209 | char c; | |
210 | ssize_t rv; | |
211 | ||
212 | BUG_ON(*pos < 0); | |
213 | ||
214 | tsk = get_proc_task(file_inode(file)); | |
215 | if (!tsk) | |
216 | return -ESRCH; | |
217 | mm = get_task_mm(tsk); | |
218 | put_task_struct(tsk); | |
219 | if (!mm) | |
220 | return 0; | |
221 | /* Check if process spawned far enough to have cmdline. */ | |
222 | if (!mm->env_end) { | |
223 | rv = 0; | |
224 | goto out_mmput; | |
225 | } | |
226 | ||
227 | page = (char *)__get_free_page(GFP_TEMPORARY); | |
228 | if (!page) { | |
229 | rv = -ENOMEM; | |
230 | goto out_mmput; | |
231 | } | |
232 | ||
233 | down_read(&mm->mmap_sem); | |
234 | arg_start = mm->arg_start; | |
235 | arg_end = mm->arg_end; | |
236 | env_start = mm->env_start; | |
237 | env_end = mm->env_end; | |
238 | up_read(&mm->mmap_sem); | |
239 | ||
240 | BUG_ON(arg_start > arg_end); | |
241 | BUG_ON(env_start > env_end); | |
242 | ||
243 | len1 = arg_end - arg_start; | |
244 | len2 = env_end - env_start; | |
245 | ||
3581d458 AD |
246 | /* Empty ARGV. */ |
247 | if (len1 == 0) { | |
248 | rv = 0; | |
249 | goto out_free_page; | |
250 | } | |
2ca66ff7 | 251 | /* |
c2c0bb44 AD |
252 | * Inherently racy -- command line shares address space |
253 | * with code and data. | |
2ca66ff7 | 254 | */ |
6347e8d5 | 255 | rv = access_remote_vm(mm, arg_end - 1, &c, 1, FOLL_FORCE); |
c2c0bb44 AD |
256 | if (rv <= 0) |
257 | goto out_free_page; | |
258 | ||
259 | rv = 0; | |
260 | ||
261 | if (c == '\0') { | |
262 | /* Command line (set of strings) occupies whole ARGV. */ | |
263 | if (len1 <= *pos) | |
264 | goto out_free_page; | |
265 | ||
266 | p = arg_start + *pos; | |
267 | len = len1 - *pos; | |
268 | while (count > 0 && len > 0) { | |
269 | unsigned int _count; | |
270 | int nr_read; | |
271 | ||
272 | _count = min3(count, len, PAGE_SIZE); | |
6347e8d5 LS |
273 | nr_read = access_remote_vm(mm, p, page, _count, |
274 | FOLL_FORCE); | |
c2c0bb44 AD |
275 | if (nr_read < 0) |
276 | rv = nr_read; | |
277 | if (nr_read <= 0) | |
278 | goto out_free_page; | |
279 | ||
280 | if (copy_to_user(buf, page, nr_read)) { | |
281 | rv = -EFAULT; | |
282 | goto out_free_page; | |
283 | } | |
284 | ||
285 | p += nr_read; | |
286 | len -= nr_read; | |
287 | buf += nr_read; | |
288 | count -= nr_read; | |
289 | rv += nr_read; | |
290 | } | |
291 | } else { | |
292 | /* | |
293 | * Command line (1 string) occupies ARGV and maybe | |
294 | * extends into ENVP. | |
295 | */ | |
296 | if (len1 + len2 <= *pos) | |
297 | goto skip_argv_envp; | |
298 | if (len1 <= *pos) | |
299 | goto skip_argv; | |
300 | ||
301 | p = arg_start + *pos; | |
302 | len = len1 - *pos; | |
303 | while (count > 0 && len > 0) { | |
304 | unsigned int _count, l; | |
305 | int nr_read; | |
306 | bool final; | |
307 | ||
308 | _count = min3(count, len, PAGE_SIZE); | |
6347e8d5 LS |
309 | nr_read = access_remote_vm(mm, p, page, _count, |
310 | FOLL_FORCE); | |
c2c0bb44 AD |
311 | if (nr_read < 0) |
312 | rv = nr_read; | |
313 | if (nr_read <= 0) | |
314 | goto out_free_page; | |
315 | ||
316 | /* | |
317 | * Command line can be shorter than whole ARGV | |
318 | * even if last "marker" byte says it is not. | |
319 | */ | |
320 | final = false; | |
321 | l = strnlen(page, nr_read); | |
322 | if (l < nr_read) { | |
323 | nr_read = l; | |
324 | final = true; | |
325 | } | |
326 | ||
327 | if (copy_to_user(buf, page, nr_read)) { | |
328 | rv = -EFAULT; | |
329 | goto out_free_page; | |
330 | } | |
331 | ||
332 | p += nr_read; | |
333 | len -= nr_read; | |
334 | buf += nr_read; | |
335 | count -= nr_read; | |
336 | rv += nr_read; | |
337 | ||
338 | if (final) | |
339 | goto out_free_page; | |
340 | } | |
341 | skip_argv: | |
342 | /* | |
343 | * Command line (1 string) occupies ARGV and | |
344 | * extends into ENVP. | |
345 | */ | |
346 | if (len1 <= *pos) { | |
347 | p = env_start + *pos - len1; | |
348 | len = len1 + len2 - *pos; | |
349 | } else { | |
350 | p = env_start; | |
351 | len = len2; | |
352 | } | |
353 | while (count > 0 && len > 0) { | |
354 | unsigned int _count, l; | |
355 | int nr_read; | |
356 | bool final; | |
357 | ||
358 | _count = min3(count, len, PAGE_SIZE); | |
6347e8d5 LS |
359 | nr_read = access_remote_vm(mm, p, page, _count, |
360 | FOLL_FORCE); | |
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; |
6347e8d5 | 838 | unsigned int flags = FOLL_FORCE; |
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 | ||
6347e8d5 LS |
851 | if (write) |
852 | flags |= FOLL_WRITE; | |
853 | ||
1da177e4 | 854 | while (count > 0) { |
572d34b9 | 855 | int this_len = min_t(int, count, PAGE_SIZE); |
1da177e4 | 856 | |
572d34b9 | 857 | if (write && copy_from_user(page, buf, this_len)) { |
1da177e4 LT |
858 | copied = -EFAULT; |
859 | break; | |
860 | } | |
572d34b9 | 861 | |
6347e8d5 | 862 | this_len = access_remote_vm(mm, addr, page, this_len, flags); |
572d34b9 | 863 | if (!this_len) { |
1da177e4 LT |
864 | if (!copied) |
865 | copied = -EIO; | |
866 | break; | |
867 | } | |
572d34b9 ON |
868 | |
869 | if (!write && copy_to_user(buf, page, this_len)) { | |
870 | copied = -EFAULT; | |
871 | break; | |
872 | } | |
873 | ||
874 | buf += this_len; | |
875 | addr += this_len; | |
876 | copied += this_len; | |
877 | count -= this_len; | |
1da177e4 | 878 | } |
572d34b9 | 879 | *ppos = addr; |
30cd8903 | 880 | |
6d08f2c7 ON |
881 | mmput(mm); |
882 | free: | |
30cd8903 | 883 | free_page((unsigned long) page); |
1da177e4 LT |
884 | return copied; |
885 | } | |
1da177e4 | 886 | |
572d34b9 ON |
887 | static ssize_t mem_read(struct file *file, char __user *buf, |
888 | size_t count, loff_t *ppos) | |
889 | { | |
890 | return mem_rw(file, buf, count, ppos, 0); | |
891 | } | |
892 | ||
893 | static ssize_t mem_write(struct file *file, const char __user *buf, | |
894 | size_t count, loff_t *ppos) | |
895 | { | |
896 | return mem_rw(file, (char __user*)buf, count, ppos, 1); | |
897 | } | |
898 | ||
85863e47 | 899 | loff_t mem_lseek(struct file *file, loff_t offset, int orig) |
1da177e4 LT |
900 | { |
901 | switch (orig) { | |
902 | case 0: | |
903 | file->f_pos = offset; | |
904 | break; | |
905 | case 1: | |
906 | file->f_pos += offset; | |
907 | break; | |
908 | default: | |
909 | return -EINVAL; | |
910 | } | |
911 | force_successful_syscall_return(); | |
912 | return file->f_pos; | |
913 | } | |
914 | ||
e268337d LT |
915 | static int mem_release(struct inode *inode, struct file *file) |
916 | { | |
917 | struct mm_struct *mm = file->private_data; | |
71879d3c | 918 | if (mm) |
6d08f2c7 | 919 | mmdrop(mm); |
e268337d LT |
920 | return 0; |
921 | } | |
922 | ||
00977a59 | 923 | static const struct file_operations proc_mem_operations = { |
1da177e4 LT |
924 | .llseek = mem_lseek, |
925 | .read = mem_read, | |
926 | .write = mem_write, | |
927 | .open = mem_open, | |
e268337d | 928 | .release = mem_release, |
1da177e4 LT |
929 | }; |
930 | ||
b409e578 CW |
931 | static int environ_open(struct inode *inode, struct file *file) |
932 | { | |
933 | return __mem_open(inode, file, PTRACE_MODE_READ); | |
934 | } | |
935 | ||
315e28c8 JP |
936 | static ssize_t environ_read(struct file *file, char __user *buf, |
937 | size_t count, loff_t *ppos) | |
938 | { | |
315e28c8 JP |
939 | char *page; |
940 | unsigned long src = *ppos; | |
b409e578 CW |
941 | int ret = 0; |
942 | struct mm_struct *mm = file->private_data; | |
a3b609ef | 943 | unsigned long env_start, env_end; |
315e28c8 | 944 | |
8148a73c MK |
945 | /* Ensure the process spawned far enough to have an environment. */ |
946 | if (!mm || !mm->env_end) | |
b409e578 | 947 | return 0; |
315e28c8 | 948 | |
315e28c8 JP |
949 | page = (char *)__get_free_page(GFP_TEMPORARY); |
950 | if (!page) | |
b409e578 | 951 | return -ENOMEM; |
315e28c8 | 952 | |
d6f64b89 | 953 | ret = 0; |
b409e578 CW |
954 | if (!atomic_inc_not_zero(&mm->mm_users)) |
955 | goto free; | |
a3b609ef MG |
956 | |
957 | down_read(&mm->mmap_sem); | |
958 | env_start = mm->env_start; | |
959 | env_end = mm->env_end; | |
960 | up_read(&mm->mmap_sem); | |
961 | ||
315e28c8 | 962 | while (count > 0) { |
e8905ec2 DH |
963 | size_t this_len, max_len; |
964 | int retval; | |
315e28c8 | 965 | |
a3b609ef | 966 | if (src >= (env_end - env_start)) |
315e28c8 JP |
967 | break; |
968 | ||
a3b609ef | 969 | this_len = env_end - (env_start + src); |
e8905ec2 DH |
970 | |
971 | max_len = min_t(size_t, PAGE_SIZE, count); | |
972 | this_len = min(max_len, this_len); | |
315e28c8 | 973 | |
a3b609ef | 974 | retval = access_remote_vm(mm, (env_start + src), |
6347e8d5 | 975 | page, this_len, FOLL_FORCE); |
315e28c8 JP |
976 | |
977 | if (retval <= 0) { | |
978 | ret = retval; | |
979 | break; | |
980 | } | |
981 | ||
982 | if (copy_to_user(buf, page, retval)) { | |
983 | ret = -EFAULT; | |
984 | break; | |
985 | } | |
986 | ||
987 | ret += retval; | |
988 | src += retval; | |
989 | buf += retval; | |
990 | count -= retval; | |
991 | } | |
992 | *ppos = src; | |
315e28c8 | 993 | mmput(mm); |
b409e578 CW |
994 | |
995 | free: | |
315e28c8 | 996 | free_page((unsigned long) page); |
315e28c8 JP |
997 | return ret; |
998 | } | |
999 | ||
1000 | static const struct file_operations proc_environ_operations = { | |
b409e578 | 1001 | .open = environ_open, |
315e28c8 | 1002 | .read = environ_read, |
87df8424 | 1003 | .llseek = generic_file_llseek, |
b409e578 | 1004 | .release = mem_release, |
315e28c8 JP |
1005 | }; |
1006 | ||
c5317167 AV |
1007 | static int auxv_open(struct inode *inode, struct file *file) |
1008 | { | |
1009 | return __mem_open(inode, file, PTRACE_MODE_READ_FSCREDS); | |
1010 | } | |
1011 | ||
1012 | static ssize_t auxv_read(struct file *file, char __user *buf, | |
1013 | size_t count, loff_t *ppos) | |
1014 | { | |
1015 | struct mm_struct *mm = file->private_data; | |
1016 | unsigned int nwords = 0; | |
1017 | do { | |
1018 | nwords += 2; | |
1019 | } while (mm->saved_auxv[nwords - 2] != 0); /* AT_NULL */ | |
1020 | return simple_read_from_buffer(buf, count, ppos, mm->saved_auxv, | |
1021 | nwords * sizeof(mm->saved_auxv[0])); | |
1022 | } | |
1023 | ||
1024 | static const struct file_operations proc_auxv_operations = { | |
1025 | .open = auxv_open, | |
1026 | .read = auxv_read, | |
1027 | .llseek = generic_file_llseek, | |
1028 | .release = mem_release, | |
1029 | }; | |
1030 | ||
fa0cbbf1 DR |
1031 | static ssize_t oom_adj_read(struct file *file, char __user *buf, size_t count, |
1032 | loff_t *ppos) | |
1033 | { | |
496ad9aa | 1034 | struct task_struct *task = get_proc_task(file_inode(file)); |
fa0cbbf1 DR |
1035 | char buffer[PROC_NUMBUF]; |
1036 | int oom_adj = OOM_ADJUST_MIN; | |
1037 | size_t len; | |
fa0cbbf1 DR |
1038 | |
1039 | if (!task) | |
1040 | return -ESRCH; | |
f913da59 MH |
1041 | if (task->signal->oom_score_adj == OOM_SCORE_ADJ_MAX) |
1042 | oom_adj = OOM_ADJUST_MAX; | |
1043 | else | |
1044 | oom_adj = (task->signal->oom_score_adj * -OOM_DISABLE) / | |
1045 | OOM_SCORE_ADJ_MAX; | |
fa0cbbf1 DR |
1046 | put_task_struct(task); |
1047 | len = snprintf(buffer, sizeof(buffer), "%d\n", oom_adj); | |
1048 | return simple_read_from_buffer(buf, count, ppos, buffer, len); | |
1049 | } | |
1050 | ||
1d5f0acb MH |
1051 | static int __set_oom_adj(struct file *file, int oom_adj, bool legacy) |
1052 | { | |
1053 | static DEFINE_MUTEX(oom_adj_mutex); | |
44a70ade | 1054 | struct mm_struct *mm = NULL; |
1d5f0acb MH |
1055 | struct task_struct *task; |
1056 | int err = 0; | |
1057 | ||
1058 | task = get_proc_task(file_inode(file)); | |
1059 | if (!task) | |
1060 | return -ESRCH; | |
1061 | ||
1062 | mutex_lock(&oom_adj_mutex); | |
1063 | if (legacy) { | |
1064 | if (oom_adj < task->signal->oom_score_adj && | |
1065 | !capable(CAP_SYS_RESOURCE)) { | |
1066 | err = -EACCES; | |
1067 | goto err_unlock; | |
1068 | } | |
1069 | /* | |
1070 | * /proc/pid/oom_adj is provided for legacy purposes, ask users to use | |
1071 | * /proc/pid/oom_score_adj instead. | |
1072 | */ | |
1073 | pr_warn_once("%s (%d): /proc/%d/oom_adj is deprecated, please use /proc/%d/oom_score_adj instead.\n", | |
1074 | current->comm, task_pid_nr(current), task_pid_nr(task), | |
1075 | task_pid_nr(task)); | |
1076 | } else { | |
1077 | if ((short)oom_adj < task->signal->oom_score_adj_min && | |
1078 | !capable(CAP_SYS_RESOURCE)) { | |
1079 | err = -EACCES; | |
1080 | goto err_unlock; | |
1081 | } | |
1082 | } | |
1083 | ||
44a70ade MH |
1084 | /* |
1085 | * Make sure we will check other processes sharing the mm if this is | |
1086 | * not vfrok which wants its own oom_score_adj. | |
1087 | * pin the mm so it doesn't go away and get reused after task_unlock | |
1088 | */ | |
1089 | if (!task->vfork_done) { | |
1090 | struct task_struct *p = find_lock_task_mm(task); | |
1091 | ||
1092 | if (p) { | |
1093 | if (atomic_read(&p->mm->mm_users) > 1) { | |
1094 | mm = p->mm; | |
1095 | atomic_inc(&mm->mm_count); | |
1096 | } | |
1097 | task_unlock(p); | |
1098 | } | |
1099 | } | |
1100 | ||
1d5f0acb MH |
1101 | task->signal->oom_score_adj = oom_adj; |
1102 | if (!legacy && has_capability_noaudit(current, CAP_SYS_RESOURCE)) | |
1103 | task->signal->oom_score_adj_min = (short)oom_adj; | |
1104 | trace_oom_score_adj_update(task); | |
44a70ade MH |
1105 | |
1106 | if (mm) { | |
1107 | struct task_struct *p; | |
1108 | ||
1109 | rcu_read_lock(); | |
1110 | for_each_process(p) { | |
1111 | if (same_thread_group(task, p)) | |
1112 | continue; | |
1113 | ||
1114 | /* do not touch kernel threads or the global init */ | |
1115 | if (p->flags & PF_KTHREAD || is_global_init(p)) | |
1116 | continue; | |
1117 | ||
1118 | task_lock(p); | |
1119 | if (!p->vfork_done && process_shares_mm(p, mm)) { | |
1120 | 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", | |
1121 | task_pid_nr(p), p->comm, | |
1122 | p->signal->oom_score_adj, oom_adj, | |
1123 | task_pid_nr(task), task->comm); | |
1124 | p->signal->oom_score_adj = oom_adj; | |
1125 | if (!legacy && has_capability_noaudit(current, CAP_SYS_RESOURCE)) | |
1126 | p->signal->oom_score_adj_min = (short)oom_adj; | |
1127 | } | |
1128 | task_unlock(p); | |
1129 | } | |
1130 | rcu_read_unlock(); | |
1131 | mmdrop(mm); | |
1132 | } | |
1d5f0acb MH |
1133 | err_unlock: |
1134 | mutex_unlock(&oom_adj_mutex); | |
1135 | put_task_struct(task); | |
1136 | return err; | |
1137 | } | |
f913da59 | 1138 | |
b72bdfa7 DR |
1139 | /* |
1140 | * /proc/pid/oom_adj exists solely for backwards compatibility with previous | |
1141 | * kernels. The effective policy is defined by oom_score_adj, which has a | |
1142 | * different scale: oom_adj grew exponentially and oom_score_adj grows linearly. | |
1143 | * Values written to oom_adj are simply mapped linearly to oom_score_adj. | |
1144 | * Processes that become oom disabled via oom_adj will still be oom disabled | |
1145 | * with this implementation. | |
1146 | * | |
1147 | * oom_adj cannot be removed since existing userspace binaries use it. | |
1148 | */ | |
fa0cbbf1 DR |
1149 | static ssize_t oom_adj_write(struct file *file, const char __user *buf, |
1150 | size_t count, loff_t *ppos) | |
1151 | { | |
fa0cbbf1 DR |
1152 | char buffer[PROC_NUMBUF]; |
1153 | int oom_adj; | |
fa0cbbf1 DR |
1154 | int err; |
1155 | ||
1156 | memset(buffer, 0, sizeof(buffer)); | |
1157 | if (count > sizeof(buffer) - 1) | |
1158 | count = sizeof(buffer) - 1; | |
1159 | if (copy_from_user(buffer, buf, count)) { | |
1160 | err = -EFAULT; | |
1161 | goto out; | |
1162 | } | |
1163 | ||
1164 | err = kstrtoint(strstrip(buffer), 0, &oom_adj); | |
1165 | if (err) | |
1166 | goto out; | |
1167 | if ((oom_adj < OOM_ADJUST_MIN || oom_adj > OOM_ADJUST_MAX) && | |
1168 | oom_adj != OOM_DISABLE) { | |
1169 | err = -EINVAL; | |
1170 | goto out; | |
1171 | } | |
1172 | ||
fa0cbbf1 DR |
1173 | /* |
1174 | * Scale /proc/pid/oom_score_adj appropriately ensuring that a maximum | |
1175 | * value is always attainable. | |
1176 | */ | |
1177 | if (oom_adj == OOM_ADJUST_MAX) | |
1178 | oom_adj = OOM_SCORE_ADJ_MAX; | |
1179 | else | |
1180 | oom_adj = (oom_adj * OOM_SCORE_ADJ_MAX) / -OOM_DISABLE; | |
1181 | ||
1d5f0acb | 1182 | err = __set_oom_adj(file, oom_adj, true); |
fa0cbbf1 DR |
1183 | out: |
1184 | return err < 0 ? err : count; | |
1185 | } | |
1186 | ||
1187 | static const struct file_operations proc_oom_adj_operations = { | |
1188 | .read = oom_adj_read, | |
1189 | .write = oom_adj_write, | |
1190 | .llseek = generic_file_llseek, | |
1191 | }; | |
1192 | ||
a63d83f4 DR |
1193 | static ssize_t oom_score_adj_read(struct file *file, char __user *buf, |
1194 | size_t count, loff_t *ppos) | |
1195 | { | |
496ad9aa | 1196 | struct task_struct *task = get_proc_task(file_inode(file)); |
a63d83f4 | 1197 | char buffer[PROC_NUMBUF]; |
a9c58b90 | 1198 | short oom_score_adj = OOM_SCORE_ADJ_MIN; |
a63d83f4 DR |
1199 | size_t len; |
1200 | ||
1201 | if (!task) | |
1202 | return -ESRCH; | |
f913da59 | 1203 | oom_score_adj = task->signal->oom_score_adj; |
a63d83f4 | 1204 | put_task_struct(task); |
a9c58b90 | 1205 | len = snprintf(buffer, sizeof(buffer), "%hd\n", oom_score_adj); |
a63d83f4 DR |
1206 | return simple_read_from_buffer(buf, count, ppos, buffer, len); |
1207 | } | |
1208 | ||
1209 | static ssize_t oom_score_adj_write(struct file *file, const char __user *buf, | |
1210 | size_t count, loff_t *ppos) | |
1211 | { | |
a63d83f4 | 1212 | char buffer[PROC_NUMBUF]; |
0a8cb8e3 | 1213 | int oom_score_adj; |
a63d83f4 DR |
1214 | int err; |
1215 | ||
1216 | memset(buffer, 0, sizeof(buffer)); | |
1217 | if (count > sizeof(buffer) - 1) | |
1218 | count = sizeof(buffer) - 1; | |
723548bf DR |
1219 | if (copy_from_user(buffer, buf, count)) { |
1220 | err = -EFAULT; | |
1221 | goto out; | |
1222 | } | |
a63d83f4 | 1223 | |
0a8cb8e3 | 1224 | err = kstrtoint(strstrip(buffer), 0, &oom_score_adj); |
a63d83f4 | 1225 | if (err) |
723548bf | 1226 | goto out; |
a63d83f4 | 1227 | if (oom_score_adj < OOM_SCORE_ADJ_MIN || |
723548bf DR |
1228 | oom_score_adj > OOM_SCORE_ADJ_MAX) { |
1229 | err = -EINVAL; | |
1230 | goto out; | |
1231 | } | |
a63d83f4 | 1232 | |
1d5f0acb | 1233 | err = __set_oom_adj(file, oom_score_adj, false); |
723548bf DR |
1234 | out: |
1235 | return err < 0 ? err : count; | |
a63d83f4 DR |
1236 | } |
1237 | ||
1238 | static const struct file_operations proc_oom_score_adj_operations = { | |
1239 | .read = oom_score_adj_read, | |
1240 | .write = oom_score_adj_write, | |
6038f373 | 1241 | .llseek = default_llseek, |
a63d83f4 DR |
1242 | }; |
1243 | ||
1da177e4 LT |
1244 | #ifdef CONFIG_AUDITSYSCALL |
1245 | #define TMPBUFLEN 21 | |
1246 | static ssize_t proc_loginuid_read(struct file * file, char __user * buf, | |
1247 | size_t count, loff_t *ppos) | |
1248 | { | |
496ad9aa | 1249 | struct inode * inode = file_inode(file); |
99f89551 | 1250 | struct task_struct *task = get_proc_task(inode); |
1da177e4 LT |
1251 | ssize_t length; |
1252 | char tmpbuf[TMPBUFLEN]; | |
1253 | ||
99f89551 EB |
1254 | if (!task) |
1255 | return -ESRCH; | |
1da177e4 | 1256 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", |
e1760bd5 EB |
1257 | from_kuid(file->f_cred->user_ns, |
1258 | audit_get_loginuid(task))); | |
99f89551 | 1259 | put_task_struct(task); |
1da177e4 LT |
1260 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); |
1261 | } | |
1262 | ||
1263 | static ssize_t proc_loginuid_write(struct file * file, const char __user * buf, | |
1264 | size_t count, loff_t *ppos) | |
1265 | { | |
496ad9aa | 1266 | struct inode * inode = file_inode(file); |
1da177e4 | 1267 | uid_t loginuid; |
e1760bd5 | 1268 | kuid_t kloginuid; |
774636e1 | 1269 | int rv; |
1da177e4 | 1270 | |
7dc52157 PM |
1271 | rcu_read_lock(); |
1272 | if (current != pid_task(proc_pid(inode), PIDTYPE_PID)) { | |
1273 | rcu_read_unlock(); | |
1da177e4 | 1274 | return -EPERM; |
7dc52157 PM |
1275 | } |
1276 | rcu_read_unlock(); | |
1da177e4 | 1277 | |
1da177e4 LT |
1278 | if (*ppos != 0) { |
1279 | /* No partial writes. */ | |
1280 | return -EINVAL; | |
1281 | } | |
1da177e4 | 1282 | |
774636e1 AD |
1283 | rv = kstrtou32_from_user(buf, count, 10, &loginuid); |
1284 | if (rv < 0) | |
1285 | return rv; | |
81407c84 EP |
1286 | |
1287 | /* is userspace tring to explicitly UNSET the loginuid? */ | |
1288 | if (loginuid == AUDIT_UID_UNSET) { | |
1289 | kloginuid = INVALID_UID; | |
1290 | } else { | |
1291 | kloginuid = make_kuid(file->f_cred->user_ns, loginuid); | |
774636e1 AD |
1292 | if (!uid_valid(kloginuid)) |
1293 | return -EINVAL; | |
e1760bd5 EB |
1294 | } |
1295 | ||
774636e1 AD |
1296 | rv = audit_set_loginuid(kloginuid); |
1297 | if (rv < 0) | |
1298 | return rv; | |
1299 | return count; | |
1da177e4 LT |
1300 | } |
1301 | ||
00977a59 | 1302 | static const struct file_operations proc_loginuid_operations = { |
1da177e4 LT |
1303 | .read = proc_loginuid_read, |
1304 | .write = proc_loginuid_write, | |
87df8424 | 1305 | .llseek = generic_file_llseek, |
1da177e4 | 1306 | }; |
1e0bd755 EP |
1307 | |
1308 | static ssize_t proc_sessionid_read(struct file * file, char __user * buf, | |
1309 | size_t count, loff_t *ppos) | |
1310 | { | |
496ad9aa | 1311 | struct inode * inode = file_inode(file); |
1e0bd755 EP |
1312 | struct task_struct *task = get_proc_task(inode); |
1313 | ssize_t length; | |
1314 | char tmpbuf[TMPBUFLEN]; | |
1315 | ||
1316 | if (!task) | |
1317 | return -ESRCH; | |
1318 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", | |
1319 | audit_get_sessionid(task)); | |
1320 | put_task_struct(task); | |
1321 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
1322 | } | |
1323 | ||
1324 | static const struct file_operations proc_sessionid_operations = { | |
1325 | .read = proc_sessionid_read, | |
87df8424 | 1326 | .llseek = generic_file_llseek, |
1e0bd755 | 1327 | }; |
1da177e4 LT |
1328 | #endif |
1329 | ||
f4f154fd AM |
1330 | #ifdef CONFIG_FAULT_INJECTION |
1331 | static ssize_t proc_fault_inject_read(struct file * file, char __user * buf, | |
1332 | size_t count, loff_t *ppos) | |
1333 | { | |
496ad9aa | 1334 | struct task_struct *task = get_proc_task(file_inode(file)); |
f4f154fd AM |
1335 | char buffer[PROC_NUMBUF]; |
1336 | size_t len; | |
1337 | int make_it_fail; | |
f4f154fd AM |
1338 | |
1339 | if (!task) | |
1340 | return -ESRCH; | |
1341 | make_it_fail = task->make_it_fail; | |
1342 | put_task_struct(task); | |
1343 | ||
1344 | len = snprintf(buffer, sizeof(buffer), "%i\n", make_it_fail); | |
0c28f287 AM |
1345 | |
1346 | return simple_read_from_buffer(buf, count, ppos, buffer, len); | |
f4f154fd AM |
1347 | } |
1348 | ||
1349 | static ssize_t proc_fault_inject_write(struct file * file, | |
1350 | const char __user * buf, size_t count, loff_t *ppos) | |
1351 | { | |
1352 | struct task_struct *task; | |
774636e1 | 1353 | char buffer[PROC_NUMBUF]; |
f4f154fd | 1354 | int make_it_fail; |
774636e1 | 1355 | int rv; |
f4f154fd AM |
1356 | |
1357 | if (!capable(CAP_SYS_RESOURCE)) | |
1358 | return -EPERM; | |
1359 | memset(buffer, 0, sizeof(buffer)); | |
1360 | if (count > sizeof(buffer) - 1) | |
1361 | count = sizeof(buffer) - 1; | |
1362 | if (copy_from_user(buffer, buf, count)) | |
1363 | return -EFAULT; | |
774636e1 AD |
1364 | rv = kstrtoint(strstrip(buffer), 0, &make_it_fail); |
1365 | if (rv < 0) | |
1366 | return rv; | |
16caed31 DJ |
1367 | if (make_it_fail < 0 || make_it_fail > 1) |
1368 | return -EINVAL; | |
1369 | ||
496ad9aa | 1370 | task = get_proc_task(file_inode(file)); |
f4f154fd AM |
1371 | if (!task) |
1372 | return -ESRCH; | |
1373 | task->make_it_fail = make_it_fail; | |
1374 | put_task_struct(task); | |
cba8aafe VL |
1375 | |
1376 | return count; | |
f4f154fd AM |
1377 | } |
1378 | ||
00977a59 | 1379 | static const struct file_operations proc_fault_inject_operations = { |
f4f154fd AM |
1380 | .read = proc_fault_inject_read, |
1381 | .write = proc_fault_inject_write, | |
87df8424 | 1382 | .llseek = generic_file_llseek, |
f4f154fd AM |
1383 | }; |
1384 | #endif | |
1385 | ||
9745512c | 1386 | |
43ae34cb IM |
1387 | #ifdef CONFIG_SCHED_DEBUG |
1388 | /* | |
1389 | * Print out various scheduling related per-task fields: | |
1390 | */ | |
1391 | static int sched_show(struct seq_file *m, void *v) | |
1392 | { | |
1393 | struct inode *inode = m->private; | |
1394 | struct task_struct *p; | |
1395 | ||
43ae34cb IM |
1396 | p = get_proc_task(inode); |
1397 | if (!p) | |
1398 | return -ESRCH; | |
1399 | proc_sched_show_task(p, m); | |
1400 | ||
1401 | put_task_struct(p); | |
1402 | ||
1403 | return 0; | |
1404 | } | |
1405 | ||
1406 | static ssize_t | |
1407 | sched_write(struct file *file, const char __user *buf, | |
1408 | size_t count, loff_t *offset) | |
1409 | { | |
496ad9aa | 1410 | struct inode *inode = file_inode(file); |
43ae34cb IM |
1411 | struct task_struct *p; |
1412 | ||
43ae34cb IM |
1413 | p = get_proc_task(inode); |
1414 | if (!p) | |
1415 | return -ESRCH; | |
1416 | proc_sched_set_task(p); | |
1417 | ||
1418 | put_task_struct(p); | |
1419 | ||
1420 | return count; | |
1421 | } | |
1422 | ||
1423 | static int sched_open(struct inode *inode, struct file *filp) | |
1424 | { | |
c6a34058 | 1425 | return single_open(filp, sched_show, inode); |
43ae34cb IM |
1426 | } |
1427 | ||
1428 | static const struct file_operations proc_pid_sched_operations = { | |
1429 | .open = sched_open, | |
1430 | .read = seq_read, | |
1431 | .write = sched_write, | |
1432 | .llseek = seq_lseek, | |
5ea473a1 | 1433 | .release = single_release, |
43ae34cb IM |
1434 | }; |
1435 | ||
1436 | #endif | |
1437 | ||
5091faa4 MG |
1438 | #ifdef CONFIG_SCHED_AUTOGROUP |
1439 | /* | |
1440 | * Print out autogroup related information: | |
1441 | */ | |
1442 | static int sched_autogroup_show(struct seq_file *m, void *v) | |
1443 | { | |
1444 | struct inode *inode = m->private; | |
1445 | struct task_struct *p; | |
1446 | ||
1447 | p = get_proc_task(inode); | |
1448 | if (!p) | |
1449 | return -ESRCH; | |
1450 | proc_sched_autogroup_show_task(p, m); | |
1451 | ||
1452 | put_task_struct(p); | |
1453 | ||
1454 | return 0; | |
1455 | } | |
1456 | ||
1457 | static ssize_t | |
1458 | sched_autogroup_write(struct file *file, const char __user *buf, | |
1459 | size_t count, loff_t *offset) | |
1460 | { | |
496ad9aa | 1461 | struct inode *inode = file_inode(file); |
5091faa4 MG |
1462 | struct task_struct *p; |
1463 | char buffer[PROC_NUMBUF]; | |
0a8cb8e3 | 1464 | int nice; |
5091faa4 MG |
1465 | int err; |
1466 | ||
1467 | memset(buffer, 0, sizeof(buffer)); | |
1468 | if (count > sizeof(buffer) - 1) | |
1469 | count = sizeof(buffer) - 1; | |
1470 | if (copy_from_user(buffer, buf, count)) | |
1471 | return -EFAULT; | |
1472 | ||
0a8cb8e3 AD |
1473 | err = kstrtoint(strstrip(buffer), 0, &nice); |
1474 | if (err < 0) | |
1475 | return err; | |
5091faa4 MG |
1476 | |
1477 | p = get_proc_task(inode); | |
1478 | if (!p) | |
1479 | return -ESRCH; | |
1480 | ||
2e5b5b3a | 1481 | err = proc_sched_autogroup_set_nice(p, nice); |
5091faa4 MG |
1482 | if (err) |
1483 | count = err; | |
1484 | ||
1485 | put_task_struct(p); | |
1486 | ||
1487 | return count; | |
1488 | } | |
1489 | ||
1490 | static int sched_autogroup_open(struct inode *inode, struct file *filp) | |
1491 | { | |
1492 | int ret; | |
1493 | ||
1494 | ret = single_open(filp, sched_autogroup_show, NULL); | |
1495 | if (!ret) { | |
1496 | struct seq_file *m = filp->private_data; | |
1497 | ||
1498 | m->private = inode; | |
1499 | } | |
1500 | return ret; | |
1501 | } | |
1502 | ||
1503 | static const struct file_operations proc_pid_sched_autogroup_operations = { | |
1504 | .open = sched_autogroup_open, | |
1505 | .read = seq_read, | |
1506 | .write = sched_autogroup_write, | |
1507 | .llseek = seq_lseek, | |
1508 | .release = single_release, | |
1509 | }; | |
1510 | ||
1511 | #endif /* CONFIG_SCHED_AUTOGROUP */ | |
1512 | ||
4614a696 JS |
1513 | static ssize_t comm_write(struct file *file, const char __user *buf, |
1514 | size_t count, loff_t *offset) | |
1515 | { | |
496ad9aa | 1516 | struct inode *inode = file_inode(file); |
4614a696 JS |
1517 | struct task_struct *p; |
1518 | char buffer[TASK_COMM_LEN]; | |
830e0fc9 | 1519 | const size_t maxlen = sizeof(buffer) - 1; |
4614a696 JS |
1520 | |
1521 | memset(buffer, 0, sizeof(buffer)); | |
830e0fc9 | 1522 | if (copy_from_user(buffer, buf, count > maxlen ? maxlen : count)) |
4614a696 JS |
1523 | return -EFAULT; |
1524 | ||
1525 | p = get_proc_task(inode); | |
1526 | if (!p) | |
1527 | return -ESRCH; | |
1528 | ||
1529 | if (same_thread_group(current, p)) | |
1530 | set_task_comm(p, buffer); | |
1531 | else | |
1532 | count = -EINVAL; | |
1533 | ||
1534 | put_task_struct(p); | |
1535 | ||
1536 | return count; | |
1537 | } | |
1538 | ||
1539 | static int comm_show(struct seq_file *m, void *v) | |
1540 | { | |
1541 | struct inode *inode = m->private; | |
1542 | struct task_struct *p; | |
1543 | ||
1544 | p = get_proc_task(inode); | |
1545 | if (!p) | |
1546 | return -ESRCH; | |
1547 | ||
1548 | task_lock(p); | |
1549 | seq_printf(m, "%s\n", p->comm); | |
1550 | task_unlock(p); | |
1551 | ||
1552 | put_task_struct(p); | |
1553 | ||
1554 | return 0; | |
1555 | } | |
1556 | ||
1557 | static int comm_open(struct inode *inode, struct file *filp) | |
1558 | { | |
c6a34058 | 1559 | return single_open(filp, comm_show, inode); |
4614a696 JS |
1560 | } |
1561 | ||
1562 | static const struct file_operations proc_pid_set_comm_operations = { | |
1563 | .open = comm_open, | |
1564 | .read = seq_read, | |
1565 | .write = comm_write, | |
1566 | .llseek = seq_lseek, | |
1567 | .release = single_release, | |
1568 | }; | |
1569 | ||
7773fbc5 | 1570 | static int proc_exe_link(struct dentry *dentry, struct path *exe_path) |
925d1c40 MH |
1571 | { |
1572 | struct task_struct *task; | |
925d1c40 MH |
1573 | struct file *exe_file; |
1574 | ||
2b0143b5 | 1575 | task = get_proc_task(d_inode(dentry)); |
925d1c40 MH |
1576 | if (!task) |
1577 | return -ENOENT; | |
cd81a917 | 1578 | exe_file = get_task_exe_file(task); |
925d1c40 | 1579 | put_task_struct(task); |
925d1c40 MH |
1580 | if (exe_file) { |
1581 | *exe_path = exe_file->f_path; | |
1582 | path_get(&exe_file->f_path); | |
1583 | fput(exe_file); | |
1584 | return 0; | |
1585 | } else | |
1586 | return -ENOENT; | |
1587 | } | |
1588 | ||
6b255391 | 1589 | static const char *proc_pid_get_link(struct dentry *dentry, |
fceef393 AV |
1590 | struct inode *inode, |
1591 | struct delayed_call *done) | |
1da177e4 | 1592 | { |
408ef013 | 1593 | struct path path; |
1da177e4 LT |
1594 | int error = -EACCES; |
1595 | ||
6b255391 AV |
1596 | if (!dentry) |
1597 | return ERR_PTR(-ECHILD); | |
1598 | ||
778c1144 EB |
1599 | /* Are we allowed to snoop on the tasks file descriptors? */ |
1600 | if (!proc_fd_access_allowed(inode)) | |
1da177e4 | 1601 | goto out; |
1da177e4 | 1602 | |
408ef013 CH |
1603 | error = PROC_I(inode)->op.proc_get_link(dentry, &path); |
1604 | if (error) | |
1605 | goto out; | |
1606 | ||
6e77137b | 1607 | nd_jump_link(&path); |
408ef013 | 1608 | return NULL; |
1da177e4 | 1609 | out: |
008b150a | 1610 | return ERR_PTR(error); |
1da177e4 LT |
1611 | } |
1612 | ||
3dcd25f3 | 1613 | static int do_proc_readlink(struct path *path, char __user *buffer, int buflen) |
1da177e4 | 1614 | { |
e12ba74d | 1615 | char *tmp = (char*)__get_free_page(GFP_TEMPORARY); |
3dcd25f3 | 1616 | char *pathname; |
1da177e4 LT |
1617 | int len; |
1618 | ||
1619 | if (!tmp) | |
1620 | return -ENOMEM; | |
0c28f287 | 1621 | |
7b2a69ba | 1622 | pathname = d_path(path, tmp, PAGE_SIZE); |
3dcd25f3 JB |
1623 | len = PTR_ERR(pathname); |
1624 | if (IS_ERR(pathname)) | |
1da177e4 | 1625 | goto out; |
3dcd25f3 | 1626 | len = tmp + PAGE_SIZE - 1 - pathname; |
1da177e4 LT |
1627 | |
1628 | if (len > buflen) | |
1629 | len = buflen; | |
3dcd25f3 | 1630 | if (copy_to_user(buffer, pathname, len)) |
1da177e4 LT |
1631 | len = -EFAULT; |
1632 | out: | |
1633 | free_page((unsigned long)tmp); | |
1634 | return len; | |
1635 | } | |
1636 | ||
1637 | static int proc_pid_readlink(struct dentry * dentry, char __user * buffer, int buflen) | |
1638 | { | |
1639 | int error = -EACCES; | |
2b0143b5 | 1640 | struct inode *inode = d_inode(dentry); |
3dcd25f3 | 1641 | struct path path; |
1da177e4 | 1642 | |
778c1144 EB |
1643 | /* Are we allowed to snoop on the tasks file descriptors? */ |
1644 | if (!proc_fd_access_allowed(inode)) | |
1da177e4 | 1645 | goto out; |
1da177e4 | 1646 | |
7773fbc5 | 1647 | error = PROC_I(inode)->op.proc_get_link(dentry, &path); |
1da177e4 LT |
1648 | if (error) |
1649 | goto out; | |
1650 | ||
3dcd25f3 JB |
1651 | error = do_proc_readlink(&path, buffer, buflen); |
1652 | path_put(&path); | |
1da177e4 | 1653 | out: |
1da177e4 LT |
1654 | return error; |
1655 | } | |
1656 | ||
faf60af1 | 1657 | const struct inode_operations proc_pid_link_inode_operations = { |
1da177e4 | 1658 | .readlink = proc_pid_readlink, |
6b255391 | 1659 | .get_link = proc_pid_get_link, |
6d76fa58 | 1660 | .setattr = proc_setattr, |
1da177e4 LT |
1661 | }; |
1662 | ||
28a6d671 EB |
1663 | |
1664 | /* building an inode */ | |
1665 | ||
6b4e306a | 1666 | struct inode *proc_pid_make_inode(struct super_block * sb, struct task_struct *task) |
28a6d671 EB |
1667 | { |
1668 | struct inode * inode; | |
1669 | struct proc_inode *ei; | |
c69e8d9c | 1670 | const struct cred *cred; |
1da177e4 | 1671 | |
28a6d671 | 1672 | /* We need a new inode */ |
1da177e4 | 1673 | |
28a6d671 EB |
1674 | inode = new_inode(sb); |
1675 | if (!inode) | |
1676 | goto out; | |
1677 | ||
1678 | /* Common stuff */ | |
1679 | ei = PROC_I(inode); | |
85fe4025 | 1680 | inode->i_ino = get_next_ino(); |
078cd827 | 1681 | inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode); |
28a6d671 EB |
1682 | inode->i_op = &proc_def_inode_operations; |
1683 | ||
1684 | /* | |
1685 | * grab the reference to task. | |
1686 | */ | |
1a657f78 | 1687 | ei->pid = get_task_pid(task, PIDTYPE_PID); |
28a6d671 EB |
1688 | if (!ei->pid) |
1689 | goto out_unlock; | |
1690 | ||
28a6d671 | 1691 | if (task_dumpable(task)) { |
c69e8d9c DH |
1692 | rcu_read_lock(); |
1693 | cred = __task_cred(task); | |
1694 | inode->i_uid = cred->euid; | |
1695 | inode->i_gid = cred->egid; | |
1696 | rcu_read_unlock(); | |
1da177e4 | 1697 | } |
28a6d671 EB |
1698 | security_task_to_inode(task, inode); |
1699 | ||
1da177e4 | 1700 | out: |
28a6d671 EB |
1701 | return inode; |
1702 | ||
1703 | out_unlock: | |
1704 | iput(inode); | |
1705 | return NULL; | |
1da177e4 LT |
1706 | } |
1707 | ||
6b4e306a | 1708 | int pid_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) |
1da177e4 | 1709 | { |
2b0143b5 | 1710 | struct inode *inode = d_inode(dentry); |
28a6d671 | 1711 | struct task_struct *task; |
c69e8d9c | 1712 | const struct cred *cred; |
0499680a | 1713 | struct pid_namespace *pid = dentry->d_sb->s_fs_info; |
c69e8d9c | 1714 | |
28a6d671 | 1715 | generic_fillattr(inode, stat); |
1da177e4 | 1716 | |
28a6d671 | 1717 | rcu_read_lock(); |
dcb0f222 EB |
1718 | stat->uid = GLOBAL_ROOT_UID; |
1719 | stat->gid = GLOBAL_ROOT_GID; | |
28a6d671 EB |
1720 | task = pid_task(proc_pid(inode), PIDTYPE_PID); |
1721 | if (task) { | |
0499680a VK |
1722 | if (!has_pid_permissions(pid, task, 2)) { |
1723 | rcu_read_unlock(); | |
1724 | /* | |
1725 | * This doesn't prevent learning whether PID exists, | |
1726 | * it only makes getattr() consistent with readdir(). | |
1727 | */ | |
1728 | return -ENOENT; | |
1729 | } | |
28a6d671 EB |
1730 | if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) || |
1731 | task_dumpable(task)) { | |
c69e8d9c DH |
1732 | cred = __task_cred(task); |
1733 | stat->uid = cred->euid; | |
1734 | stat->gid = cred->egid; | |
1da177e4 LT |
1735 | } |
1736 | } | |
28a6d671 | 1737 | rcu_read_unlock(); |
d6e71144 | 1738 | return 0; |
1da177e4 LT |
1739 | } |
1740 | ||
1da177e4 LT |
1741 | /* dentry stuff */ |
1742 | ||
1743 | /* | |
1744 | * Exceptional case: normally we are not allowed to unhash a busy | |
1745 | * directory. In this case, however, we can do it - no aliasing problems | |
1746 | * due to the way we treat inodes. | |
1747 | * | |
1748 | * Rewrite the inode's ownerships here because the owning task may have | |
1749 | * performed a setuid(), etc. | |
99f89551 EB |
1750 | * |
1751 | * Before the /proc/pid/status file was created the only way to read | |
1752 | * the effective uid of a /process was to stat /proc/pid. Reading | |
1753 | * /proc/pid/status is slow enough that procps and other packages | |
1754 | * kept stating /proc/pid. To keep the rules in /proc simple I have | |
1755 | * made this apply to all per process world readable and executable | |
1756 | * directories. | |
1da177e4 | 1757 | */ |
0b728e19 | 1758 | int pid_revalidate(struct dentry *dentry, unsigned int flags) |
1da177e4 | 1759 | { |
34286d66 NP |
1760 | struct inode *inode; |
1761 | struct task_struct *task; | |
c69e8d9c DH |
1762 | const struct cred *cred; |
1763 | ||
0b728e19 | 1764 | if (flags & LOOKUP_RCU) |
34286d66 NP |
1765 | return -ECHILD; |
1766 | ||
2b0143b5 | 1767 | inode = d_inode(dentry); |
34286d66 NP |
1768 | task = get_proc_task(inode); |
1769 | ||
99f89551 EB |
1770 | if (task) { |
1771 | if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) || | |
1772 | task_dumpable(task)) { | |
c69e8d9c DH |
1773 | rcu_read_lock(); |
1774 | cred = __task_cred(task); | |
1775 | inode->i_uid = cred->euid; | |
1776 | inode->i_gid = cred->egid; | |
1777 | rcu_read_unlock(); | |
1da177e4 | 1778 | } else { |
dcb0f222 EB |
1779 | inode->i_uid = GLOBAL_ROOT_UID; |
1780 | inode->i_gid = GLOBAL_ROOT_GID; | |
1da177e4 | 1781 | } |
9ee8ab9f | 1782 | inode->i_mode &= ~(S_ISUID | S_ISGID); |
1da177e4 | 1783 | security_task_to_inode(task, inode); |
99f89551 | 1784 | put_task_struct(task); |
1da177e4 LT |
1785 | return 1; |
1786 | } | |
1da177e4 LT |
1787 | return 0; |
1788 | } | |
1789 | ||
d855a4b7 ON |
1790 | static inline bool proc_inode_is_dead(struct inode *inode) |
1791 | { | |
1792 | return !proc_pid(inode)->tasks[PIDTYPE_PID].first; | |
1793 | } | |
1794 | ||
1dd704b6 DH |
1795 | int pid_delete_dentry(const struct dentry *dentry) |
1796 | { | |
1797 | /* Is the task we represent dead? | |
1798 | * If so, then don't put the dentry on the lru list, | |
1799 | * kill it immediately. | |
1800 | */ | |
2b0143b5 | 1801 | return proc_inode_is_dead(d_inode(dentry)); |
1dd704b6 DH |
1802 | } |
1803 | ||
6b4e306a | 1804 | const struct dentry_operations pid_dentry_operations = |
28a6d671 EB |
1805 | { |
1806 | .d_revalidate = pid_revalidate, | |
1807 | .d_delete = pid_delete_dentry, | |
1808 | }; | |
1809 | ||
1810 | /* Lookups */ | |
1811 | ||
1c0d04c9 EB |
1812 | /* |
1813 | * Fill a directory entry. | |
1814 | * | |
1815 | * If possible create the dcache entry and derive our inode number and | |
1816 | * file type from dcache entry. | |
1817 | * | |
1818 | * Since all of the proc inode numbers are dynamically generated, the inode | |
1819 | * numbers do not exist until the inode is cache. This means creating the | |
1820 | * the dcache entry in readdir is necessary to keep the inode numbers | |
1821 | * reported by readdir in sync with the inode numbers reported | |
1822 | * by stat. | |
1823 | */ | |
f0c3b509 | 1824 | bool proc_fill_cache(struct file *file, struct dir_context *ctx, |
6b4e306a | 1825 | const char *name, int len, |
c5141e6d | 1826 | instantiate_t instantiate, struct task_struct *task, const void *ptr) |
61a28784 | 1827 | { |
f0c3b509 | 1828 | struct dentry *child, *dir = file->f_path.dentry; |
1df98b8b | 1829 | struct qstr qname = QSTR_INIT(name, len); |
61a28784 | 1830 | struct inode *inode; |
1df98b8b AV |
1831 | unsigned type; |
1832 | ino_t ino; | |
61a28784 | 1833 | |
1df98b8b | 1834 | child = d_hash_and_lookup(dir, &qname); |
61a28784 | 1835 | if (!child) { |
3781764b AV |
1836 | DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq); |
1837 | child = d_alloc_parallel(dir, &qname, &wq); | |
1838 | if (IS_ERR(child)) | |
1df98b8b | 1839 | goto end_instantiate; |
3781764b AV |
1840 | if (d_in_lookup(child)) { |
1841 | int err = instantiate(d_inode(dir), child, task, ptr); | |
1842 | d_lookup_done(child); | |
1843 | if (err < 0) { | |
1844 | dput(child); | |
1845 | goto end_instantiate; | |
1846 | } | |
61a28784 EB |
1847 | } |
1848 | } | |
2b0143b5 | 1849 | inode = d_inode(child); |
147ce699 AV |
1850 | ino = inode->i_ino; |
1851 | type = inode->i_mode >> 12; | |
61a28784 | 1852 | dput(child); |
f0c3b509 | 1853 | return dir_emit(ctx, name, len, ino, type); |
1df98b8b AV |
1854 | |
1855 | end_instantiate: | |
1856 | return dir_emit(ctx, name, len, 1, DT_UNKNOWN); | |
61a28784 EB |
1857 | } |
1858 | ||
640708a2 PE |
1859 | /* |
1860 | * dname_to_vma_addr - maps a dentry name into two unsigned longs | |
1861 | * which represent vma start and end addresses. | |
1862 | */ | |
1863 | static int dname_to_vma_addr(struct dentry *dentry, | |
1864 | unsigned long *start, unsigned long *end) | |
1865 | { | |
1866 | if (sscanf(dentry->d_name.name, "%lx-%lx", start, end) != 2) | |
1867 | return -EINVAL; | |
1868 | ||
1869 | return 0; | |
1870 | } | |
1871 | ||
0b728e19 | 1872 | static int map_files_d_revalidate(struct dentry *dentry, unsigned int flags) |
640708a2 PE |
1873 | { |
1874 | unsigned long vm_start, vm_end; | |
1875 | bool exact_vma_exists = false; | |
1876 | struct mm_struct *mm = NULL; | |
1877 | struct task_struct *task; | |
1878 | const struct cred *cred; | |
1879 | struct inode *inode; | |
1880 | int status = 0; | |
1881 | ||
0b728e19 | 1882 | if (flags & LOOKUP_RCU) |
640708a2 PE |
1883 | return -ECHILD; |
1884 | ||
2b0143b5 | 1885 | inode = d_inode(dentry); |
640708a2 PE |
1886 | task = get_proc_task(inode); |
1887 | if (!task) | |
1888 | goto out_notask; | |
1889 | ||
caaee623 | 1890 | mm = mm_access(task, PTRACE_MODE_READ_FSCREDS); |
2344bec7 | 1891 | if (IS_ERR_OR_NULL(mm)) |
640708a2 PE |
1892 | goto out; |
1893 | ||
1894 | if (!dname_to_vma_addr(dentry, &vm_start, &vm_end)) { | |
1895 | down_read(&mm->mmap_sem); | |
1896 | exact_vma_exists = !!find_exact_vma(mm, vm_start, vm_end); | |
1897 | up_read(&mm->mmap_sem); | |
1898 | } | |
1899 | ||
1900 | mmput(mm); | |
1901 | ||
1902 | if (exact_vma_exists) { | |
1903 | if (task_dumpable(task)) { | |
1904 | rcu_read_lock(); | |
1905 | cred = __task_cred(task); | |
1906 | inode->i_uid = cred->euid; | |
1907 | inode->i_gid = cred->egid; | |
1908 | rcu_read_unlock(); | |
1909 | } else { | |
dcb0f222 EB |
1910 | inode->i_uid = GLOBAL_ROOT_UID; |
1911 | inode->i_gid = GLOBAL_ROOT_GID; | |
640708a2 PE |
1912 | } |
1913 | security_task_to_inode(task, inode); | |
1914 | status = 1; | |
1915 | } | |
1916 | ||
1917 | out: | |
1918 | put_task_struct(task); | |
1919 | ||
1920 | out_notask: | |
640708a2 PE |
1921 | return status; |
1922 | } | |
1923 | ||
1924 | static const struct dentry_operations tid_map_files_dentry_operations = { | |
1925 | .d_revalidate = map_files_d_revalidate, | |
1926 | .d_delete = pid_delete_dentry, | |
1927 | }; | |
1928 | ||
6b255391 | 1929 | static int map_files_get_link(struct dentry *dentry, struct path *path) |
640708a2 PE |
1930 | { |
1931 | unsigned long vm_start, vm_end; | |
1932 | struct vm_area_struct *vma; | |
1933 | struct task_struct *task; | |
1934 | struct mm_struct *mm; | |
1935 | int rc; | |
1936 | ||
1937 | rc = -ENOENT; | |
2b0143b5 | 1938 | task = get_proc_task(d_inode(dentry)); |
640708a2 PE |
1939 | if (!task) |
1940 | goto out; | |
1941 | ||
1942 | mm = get_task_mm(task); | |
1943 | put_task_struct(task); | |
1944 | if (!mm) | |
1945 | goto out; | |
1946 | ||
1947 | rc = dname_to_vma_addr(dentry, &vm_start, &vm_end); | |
1948 | if (rc) | |
1949 | goto out_mmput; | |
1950 | ||
70335abb | 1951 | rc = -ENOENT; |
640708a2 PE |
1952 | down_read(&mm->mmap_sem); |
1953 | vma = find_exact_vma(mm, vm_start, vm_end); | |
1954 | if (vma && vma->vm_file) { | |
1955 | *path = vma->vm_file->f_path; | |
1956 | path_get(path); | |
1957 | rc = 0; | |
1958 | } | |
1959 | up_read(&mm->mmap_sem); | |
1960 | ||
1961 | out_mmput: | |
1962 | mmput(mm); | |
1963 | out: | |
1964 | return rc; | |
1965 | } | |
1966 | ||
1967 | struct map_files_info { | |
7b540d06 | 1968 | fmode_t mode; |
640708a2 PE |
1969 | unsigned long len; |
1970 | unsigned char name[4*sizeof(long)+2]; /* max: %lx-%lx\0 */ | |
1971 | }; | |
1972 | ||
bdb4d100 CO |
1973 | /* |
1974 | * Only allow CAP_SYS_ADMIN to follow the links, due to concerns about how the | |
1975 | * symlinks may be used to bypass permissions on ancestor directories in the | |
1976 | * path to the file in question. | |
1977 | */ | |
1978 | static const char * | |
6b255391 | 1979 | proc_map_files_get_link(struct dentry *dentry, |
fceef393 AV |
1980 | struct inode *inode, |
1981 | struct delayed_call *done) | |
bdb4d100 CO |
1982 | { |
1983 | if (!capable(CAP_SYS_ADMIN)) | |
1984 | return ERR_PTR(-EPERM); | |
1985 | ||
fceef393 | 1986 | return proc_pid_get_link(dentry, inode, done); |
bdb4d100 CO |
1987 | } |
1988 | ||
1989 | /* | |
6b255391 | 1990 | * Identical to proc_pid_link_inode_operations except for get_link() |
bdb4d100 CO |
1991 | */ |
1992 | static const struct inode_operations proc_map_files_link_inode_operations = { | |
1993 | .readlink = proc_pid_readlink, | |
6b255391 | 1994 | .get_link = proc_map_files_get_link, |
bdb4d100 CO |
1995 | .setattr = proc_setattr, |
1996 | }; | |
1997 | ||
c52a47ac | 1998 | static int |
640708a2 PE |
1999 | proc_map_files_instantiate(struct inode *dir, struct dentry *dentry, |
2000 | struct task_struct *task, const void *ptr) | |
2001 | { | |
7b540d06 | 2002 | fmode_t mode = (fmode_t)(unsigned long)ptr; |
640708a2 PE |
2003 | struct proc_inode *ei; |
2004 | struct inode *inode; | |
2005 | ||
640708a2 PE |
2006 | inode = proc_pid_make_inode(dir->i_sb, task); |
2007 | if (!inode) | |
c52a47ac | 2008 | return -ENOENT; |
640708a2 PE |
2009 | |
2010 | ei = PROC_I(inode); | |
6b255391 | 2011 | ei->op.proc_get_link = map_files_get_link; |
640708a2 | 2012 | |
bdb4d100 | 2013 | inode->i_op = &proc_map_files_link_inode_operations; |
640708a2 PE |
2014 | inode->i_size = 64; |
2015 | inode->i_mode = S_IFLNK; | |
2016 | ||
7b540d06 | 2017 | if (mode & FMODE_READ) |
640708a2 | 2018 | inode->i_mode |= S_IRUSR; |
7b540d06 | 2019 | if (mode & FMODE_WRITE) |
640708a2 PE |
2020 | inode->i_mode |= S_IWUSR; |
2021 | ||
2022 | d_set_d_op(dentry, &tid_map_files_dentry_operations); | |
2023 | d_add(dentry, inode); | |
2024 | ||
c52a47ac | 2025 | return 0; |
640708a2 PE |
2026 | } |
2027 | ||
2028 | static struct dentry *proc_map_files_lookup(struct inode *dir, | |
00cd8dd3 | 2029 | struct dentry *dentry, unsigned int flags) |
640708a2 PE |
2030 | { |
2031 | unsigned long vm_start, vm_end; | |
2032 | struct vm_area_struct *vma; | |
2033 | struct task_struct *task; | |
c52a47ac | 2034 | int result; |
640708a2 PE |
2035 | struct mm_struct *mm; |
2036 | ||
c52a47ac | 2037 | result = -ENOENT; |
640708a2 PE |
2038 | task = get_proc_task(dir); |
2039 | if (!task) | |
2040 | goto out; | |
2041 | ||
c52a47ac | 2042 | result = -EACCES; |
caaee623 | 2043 | if (!ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS)) |
640708a2 PE |
2044 | goto out_put_task; |
2045 | ||
c52a47ac | 2046 | result = -ENOENT; |
640708a2 | 2047 | if (dname_to_vma_addr(dentry, &vm_start, &vm_end)) |
eb94cd96 | 2048 | goto out_put_task; |
640708a2 PE |
2049 | |
2050 | mm = get_task_mm(task); | |
2051 | if (!mm) | |
eb94cd96 | 2052 | goto out_put_task; |
640708a2 PE |
2053 | |
2054 | down_read(&mm->mmap_sem); | |
2055 | vma = find_exact_vma(mm, vm_start, vm_end); | |
2056 | if (!vma) | |
2057 | goto out_no_vma; | |
2058 | ||
05f56484 SK |
2059 | if (vma->vm_file) |
2060 | result = proc_map_files_instantiate(dir, dentry, task, | |
2061 | (void *)(unsigned long)vma->vm_file->f_mode); | |
640708a2 PE |
2062 | |
2063 | out_no_vma: | |
2064 | up_read(&mm->mmap_sem); | |
2065 | mmput(mm); | |
640708a2 PE |
2066 | out_put_task: |
2067 | put_task_struct(task); | |
2068 | out: | |
c52a47ac | 2069 | return ERR_PTR(result); |
640708a2 PE |
2070 | } |
2071 | ||
2072 | static const struct inode_operations proc_map_files_inode_operations = { | |
2073 | .lookup = proc_map_files_lookup, | |
2074 | .permission = proc_fd_permission, | |
2075 | .setattr = proc_setattr, | |
2076 | }; | |
2077 | ||
2078 | static int | |
f0c3b509 | 2079 | proc_map_files_readdir(struct file *file, struct dir_context *ctx) |
640708a2 | 2080 | { |
640708a2 PE |
2081 | struct vm_area_struct *vma; |
2082 | struct task_struct *task; | |
2083 | struct mm_struct *mm; | |
f0c3b509 AV |
2084 | unsigned long nr_files, pos, i; |
2085 | struct flex_array *fa = NULL; | |
2086 | struct map_files_info info; | |
2087 | struct map_files_info *p; | |
640708a2 PE |
2088 | int ret; |
2089 | ||
640708a2 | 2090 | ret = -ENOENT; |
f0c3b509 | 2091 | task = get_proc_task(file_inode(file)); |
640708a2 PE |
2092 | if (!task) |
2093 | goto out; | |
2094 | ||
2095 | ret = -EACCES; | |
caaee623 | 2096 | if (!ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS)) |
640708a2 PE |
2097 | goto out_put_task; |
2098 | ||
2099 | ret = 0; | |
f0c3b509 AV |
2100 | if (!dir_emit_dots(file, ctx)) |
2101 | goto out_put_task; | |
640708a2 | 2102 | |
f0c3b509 AV |
2103 | mm = get_task_mm(task); |
2104 | if (!mm) | |
2105 | goto out_put_task; | |
2106 | down_read(&mm->mmap_sem); | |
640708a2 | 2107 | |
f0c3b509 | 2108 | nr_files = 0; |
640708a2 | 2109 | |
f0c3b509 AV |
2110 | /* |
2111 | * We need two passes here: | |
2112 | * | |
2113 | * 1) Collect vmas of mapped files with mmap_sem taken | |
2114 | * 2) Release mmap_sem and instantiate entries | |
2115 | * | |
2116 | * otherwise we get lockdep complained, since filldir() | |
2117 | * routine might require mmap_sem taken in might_fault(). | |
2118 | */ | |
640708a2 | 2119 | |
f0c3b509 AV |
2120 | for (vma = mm->mmap, pos = 2; vma; vma = vma->vm_next) { |
2121 | if (vma->vm_file && ++pos > ctx->pos) | |
2122 | nr_files++; | |
2123 | } | |
2124 | ||
2125 | if (nr_files) { | |
2126 | fa = flex_array_alloc(sizeof(info), nr_files, | |
2127 | GFP_KERNEL); | |
2128 | if (!fa || flex_array_prealloc(fa, 0, nr_files, | |
2129 | GFP_KERNEL)) { | |
2130 | ret = -ENOMEM; | |
2131 | if (fa) | |
2132 | flex_array_free(fa); | |
2133 | up_read(&mm->mmap_sem); | |
2134 | mmput(mm); | |
2135 | goto out_put_task; | |
640708a2 | 2136 | } |
f0c3b509 AV |
2137 | for (i = 0, vma = mm->mmap, pos = 2; vma; |
2138 | vma = vma->vm_next) { | |
2139 | if (!vma->vm_file) | |
2140 | continue; | |
2141 | if (++pos <= ctx->pos) | |
2142 | continue; | |
2143 | ||
2144 | info.mode = vma->vm_file->f_mode; | |
2145 | info.len = snprintf(info.name, | |
2146 | sizeof(info.name), "%lx-%lx", | |
2147 | vma->vm_start, vma->vm_end); | |
2148 | if (flex_array_put(fa, i++, &info, GFP_KERNEL)) | |
2149 | BUG(); | |
640708a2 | 2150 | } |
640708a2 | 2151 | } |
f0c3b509 AV |
2152 | up_read(&mm->mmap_sem); |
2153 | ||
2154 | for (i = 0; i < nr_files; i++) { | |
2155 | p = flex_array_get(fa, i); | |
2156 | if (!proc_fill_cache(file, ctx, | |
2157 | p->name, p->len, | |
2158 | proc_map_files_instantiate, | |
2159 | task, | |
2160 | (void *)(unsigned long)p->mode)) | |
2161 | break; | |
2162 | ctx->pos++; | |
640708a2 | 2163 | } |
f0c3b509 AV |
2164 | if (fa) |
2165 | flex_array_free(fa); | |
2166 | mmput(mm); | |
640708a2 | 2167 | |
640708a2 PE |
2168 | out_put_task: |
2169 | put_task_struct(task); | |
2170 | out: | |
2171 | return ret; | |
2172 | } | |
2173 | ||
2174 | static const struct file_operations proc_map_files_operations = { | |
2175 | .read = generic_read_dir, | |
f50752ea AV |
2176 | .iterate_shared = proc_map_files_readdir, |
2177 | .llseek = generic_file_llseek, | |
640708a2 PE |
2178 | }; |
2179 | ||
b5946bea | 2180 | #ifdef CONFIG_CHECKPOINT_RESTORE |
48f6a7a5 PE |
2181 | struct timers_private { |
2182 | struct pid *pid; | |
2183 | struct task_struct *task; | |
2184 | struct sighand_struct *sighand; | |
57b8015e | 2185 | struct pid_namespace *ns; |
48f6a7a5 PE |
2186 | unsigned long flags; |
2187 | }; | |
2188 | ||
2189 | static void *timers_start(struct seq_file *m, loff_t *pos) | |
2190 | { | |
2191 | struct timers_private *tp = m->private; | |
2192 | ||
2193 | tp->task = get_pid_task(tp->pid, PIDTYPE_PID); | |
2194 | if (!tp->task) | |
2195 | return ERR_PTR(-ESRCH); | |
2196 | ||
2197 | tp->sighand = lock_task_sighand(tp->task, &tp->flags); | |
2198 | if (!tp->sighand) | |
2199 | return ERR_PTR(-ESRCH); | |
2200 | ||
2201 | return seq_list_start(&tp->task->signal->posix_timers, *pos); | |
2202 | } | |
2203 | ||
2204 | static void *timers_next(struct seq_file *m, void *v, loff_t *pos) | |
2205 | { | |
2206 | struct timers_private *tp = m->private; | |
2207 | return seq_list_next(v, &tp->task->signal->posix_timers, pos); | |
2208 | } | |
2209 | ||
2210 | static void timers_stop(struct seq_file *m, void *v) | |
2211 | { | |
2212 | struct timers_private *tp = m->private; | |
2213 | ||
2214 | if (tp->sighand) { | |
2215 | unlock_task_sighand(tp->task, &tp->flags); | |
2216 | tp->sighand = NULL; | |
2217 | } | |
2218 | ||
2219 | if (tp->task) { | |
2220 | put_task_struct(tp->task); | |
2221 | tp->task = NULL; | |
2222 | } | |
2223 | } | |
2224 | ||
2225 | static int show_timer(struct seq_file *m, void *v) | |
2226 | { | |
2227 | struct k_itimer *timer; | |
57b8015e PE |
2228 | struct timers_private *tp = m->private; |
2229 | int notify; | |
cedbccab | 2230 | static const char * const nstr[] = { |
57b8015e PE |
2231 | [SIGEV_SIGNAL] = "signal", |
2232 | [SIGEV_NONE] = "none", | |
2233 | [SIGEV_THREAD] = "thread", | |
2234 | }; | |
48f6a7a5 PE |
2235 | |
2236 | timer = list_entry((struct list_head *)v, struct k_itimer, list); | |
57b8015e PE |
2237 | notify = timer->it_sigev_notify; |
2238 | ||
48f6a7a5 | 2239 | seq_printf(m, "ID: %d\n", timer->it_id); |
25ce3191 JP |
2240 | seq_printf(m, "signal: %d/%p\n", |
2241 | timer->sigq->info.si_signo, | |
2242 | timer->sigq->info.si_value.sival_ptr); | |
57b8015e | 2243 | seq_printf(m, "notify: %s/%s.%d\n", |
25ce3191 JP |
2244 | nstr[notify & ~SIGEV_THREAD_ID], |
2245 | (notify & SIGEV_THREAD_ID) ? "tid" : "pid", | |
2246 | pid_nr_ns(timer->it_pid, tp->ns)); | |
15ef0298 | 2247 | seq_printf(m, "ClockID: %d\n", timer->it_clock); |
48f6a7a5 PE |
2248 | |
2249 | return 0; | |
2250 | } | |
2251 | ||
2252 | static const struct seq_operations proc_timers_seq_ops = { | |
2253 | .start = timers_start, | |
2254 | .next = timers_next, | |
2255 | .stop = timers_stop, | |
2256 | .show = show_timer, | |
2257 | }; | |
2258 | ||
2259 | static int proc_timers_open(struct inode *inode, struct file *file) | |
2260 | { | |
2261 | struct timers_private *tp; | |
2262 | ||
2263 | tp = __seq_open_private(file, &proc_timers_seq_ops, | |
2264 | sizeof(struct timers_private)); | |
2265 | if (!tp) | |
2266 | return -ENOMEM; | |
2267 | ||
2268 | tp->pid = proc_pid(inode); | |
57b8015e | 2269 | tp->ns = inode->i_sb->s_fs_info; |
48f6a7a5 PE |
2270 | return 0; |
2271 | } | |
2272 | ||
2273 | static const struct file_operations proc_timers_operations = { | |
2274 | .open = proc_timers_open, | |
2275 | .read = seq_read, | |
2276 | .llseek = seq_lseek, | |
2277 | .release = seq_release_private, | |
2278 | }; | |
b5946bea | 2279 | #endif |
640708a2 | 2280 | |
5de23d43 JS |
2281 | static ssize_t timerslack_ns_write(struct file *file, const char __user *buf, |
2282 | size_t count, loff_t *offset) | |
2283 | { | |
2284 | struct inode *inode = file_inode(file); | |
2285 | struct task_struct *p; | |
2286 | u64 slack_ns; | |
2287 | int err; | |
2288 | ||
2289 | err = kstrtoull_from_user(buf, count, 10, &slack_ns); | |
2290 | if (err < 0) | |
2291 | return err; | |
2292 | ||
2293 | p = get_proc_task(inode); | |
2294 | if (!p) | |
2295 | return -ESRCH; | |
2296 | ||
4b2bd5fe JS |
2297 | if (p != current) { |
2298 | if (!capable(CAP_SYS_NICE)) { | |
2299 | count = -EPERM; | |
2300 | goto out; | |
2301 | } | |
5de23d43 | 2302 | |
4b2bd5fe JS |
2303 | err = security_task_setscheduler(p); |
2304 | if (err) { | |
2305 | count = err; | |
2306 | goto out; | |
2307 | } | |
904763e1 JS |
2308 | } |
2309 | ||
7abbaf94 JS |
2310 | task_lock(p); |
2311 | if (slack_ns == 0) | |
2312 | p->timer_slack_ns = p->default_timer_slack_ns; | |
2313 | else | |
2314 | p->timer_slack_ns = slack_ns; | |
2315 | task_unlock(p); | |
2316 | ||
2317 | out: | |
5de23d43 JS |
2318 | put_task_struct(p); |
2319 | ||
2320 | return count; | |
2321 | } | |
2322 | ||
2323 | static int timerslack_ns_show(struct seq_file *m, void *v) | |
2324 | { | |
2325 | struct inode *inode = m->private; | |
2326 | struct task_struct *p; | |
7abbaf94 | 2327 | int err = 0; |
5de23d43 JS |
2328 | |
2329 | p = get_proc_task(inode); | |
2330 | if (!p) | |
2331 | return -ESRCH; | |
2332 | ||
4b2bd5fe | 2333 | if (p != current) { |
5de23d43 | 2334 | |
4b2bd5fe JS |
2335 | if (!capable(CAP_SYS_NICE)) { |
2336 | err = -EPERM; | |
2337 | goto out; | |
2338 | } | |
2339 | err = security_task_getscheduler(p); | |
2340 | if (err) | |
2341 | goto out; | |
2342 | } | |
904763e1 | 2343 | |
7abbaf94 JS |
2344 | task_lock(p); |
2345 | seq_printf(m, "%llu\n", p->timer_slack_ns); | |
2346 | task_unlock(p); | |
2347 | ||
2348 | out: | |
5de23d43 JS |
2349 | put_task_struct(p); |
2350 | ||
2351 | return err; | |
2352 | } | |
2353 | ||
2354 | static int timerslack_ns_open(struct inode *inode, struct file *filp) | |
2355 | { | |
2356 | return single_open(filp, timerslack_ns_show, inode); | |
2357 | } | |
2358 | ||
2359 | static const struct file_operations proc_pid_set_timerslack_ns_operations = { | |
2360 | .open = timerslack_ns_open, | |
2361 | .read = seq_read, | |
2362 | .write = timerslack_ns_write, | |
2363 | .llseek = seq_lseek, | |
2364 | .release = single_release, | |
2365 | }; | |
2366 | ||
c52a47ac | 2367 | static int proc_pident_instantiate(struct inode *dir, |
c5141e6d | 2368 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
444ceed8 | 2369 | { |
c5141e6d | 2370 | const struct pid_entry *p = ptr; |
444ceed8 EB |
2371 | struct inode *inode; |
2372 | struct proc_inode *ei; | |
444ceed8 | 2373 | |
61a28784 | 2374 | inode = proc_pid_make_inode(dir->i_sb, task); |
444ceed8 EB |
2375 | if (!inode) |
2376 | goto out; | |
2377 | ||
2378 | ei = PROC_I(inode); | |
2379 | inode->i_mode = p->mode; | |
2380 | if (S_ISDIR(inode->i_mode)) | |
bfe86848 | 2381 | set_nlink(inode, 2); /* Use getattr to fix if necessary */ |
444ceed8 EB |
2382 | if (p->iop) |
2383 | inode->i_op = p->iop; | |
2384 | if (p->fop) | |
2385 | inode->i_fop = p->fop; | |
2386 | ei->op = p->op; | |
fb045adb | 2387 | d_set_d_op(dentry, &pid_dentry_operations); |
444ceed8 EB |
2388 | d_add(dentry, inode); |
2389 | /* Close the race of the process dying before we return the dentry */ | |
0b728e19 | 2390 | if (pid_revalidate(dentry, 0)) |
c52a47ac | 2391 | return 0; |
444ceed8 | 2392 | out: |
c52a47ac | 2393 | return -ENOENT; |
444ceed8 EB |
2394 | } |
2395 | ||
1da177e4 LT |
2396 | static struct dentry *proc_pident_lookup(struct inode *dir, |
2397 | struct dentry *dentry, | |
c5141e6d | 2398 | const struct pid_entry *ents, |
7bcd6b0e | 2399 | unsigned int nents) |
1da177e4 | 2400 | { |
c52a47ac | 2401 | int error; |
99f89551 | 2402 | struct task_struct *task = get_proc_task(dir); |
c5141e6d | 2403 | const struct pid_entry *p, *last; |
1da177e4 | 2404 | |
c52a47ac | 2405 | error = -ENOENT; |
1da177e4 | 2406 | |
99f89551 EB |
2407 | if (!task) |
2408 | goto out_no_task; | |
1da177e4 | 2409 | |
20cdc894 EB |
2410 | /* |
2411 | * Yes, it does not scale. And it should not. Don't add | |
2412 | * new entries into /proc/<tgid>/ without very good reasons. | |
2413 | */ | |
7bcd6b0e EB |
2414 | last = &ents[nents - 1]; |
2415 | for (p = ents; p <= last; p++) { | |
1da177e4 LT |
2416 | if (p->len != dentry->d_name.len) |
2417 | continue; | |
2418 | if (!memcmp(dentry->d_name.name, p->name, p->len)) | |
2419 | break; | |
2420 | } | |
7bcd6b0e | 2421 | if (p > last) |
1da177e4 LT |
2422 | goto out; |
2423 | ||
444ceed8 | 2424 | error = proc_pident_instantiate(dir, dentry, task, p); |
1da177e4 | 2425 | out: |
99f89551 EB |
2426 | put_task_struct(task); |
2427 | out_no_task: | |
c52a47ac | 2428 | return ERR_PTR(error); |
1da177e4 LT |
2429 | } |
2430 | ||
f0c3b509 | 2431 | static int proc_pident_readdir(struct file *file, struct dir_context *ctx, |
c5141e6d | 2432 | const struct pid_entry *ents, unsigned int nents) |
28a6d671 | 2433 | { |
f0c3b509 AV |
2434 | struct task_struct *task = get_proc_task(file_inode(file)); |
2435 | const struct pid_entry *p; | |
28a6d671 | 2436 | |
28a6d671 | 2437 | if (!task) |
f0c3b509 | 2438 | return -ENOENT; |
28a6d671 | 2439 | |
f0c3b509 AV |
2440 | if (!dir_emit_dots(file, ctx)) |
2441 | goto out; | |
2442 | ||
2443 | if (ctx->pos >= nents + 2) | |
2444 | goto out; | |
28a6d671 | 2445 | |
f0c3b509 AV |
2446 | for (p = ents + (ctx->pos - 2); p <= ents + nents - 1; p++) { |
2447 | if (!proc_fill_cache(file, ctx, p->name, p->len, | |
2448 | proc_pident_instantiate, task, p)) | |
2449 | break; | |
2450 | ctx->pos++; | |
2451 | } | |
28a6d671 | 2452 | out: |
61a28784 | 2453 | put_task_struct(task); |
f0c3b509 | 2454 | return 0; |
1da177e4 LT |
2455 | } |
2456 | ||
28a6d671 EB |
2457 | #ifdef CONFIG_SECURITY |
2458 | static ssize_t proc_pid_attr_read(struct file * file, char __user * buf, | |
2459 | size_t count, loff_t *ppos) | |
2460 | { | |
496ad9aa | 2461 | struct inode * inode = file_inode(file); |
04ff9708 | 2462 | char *p = NULL; |
28a6d671 EB |
2463 | ssize_t length; |
2464 | struct task_struct *task = get_proc_task(inode); | |
2465 | ||
28a6d671 | 2466 | if (!task) |
04ff9708 | 2467 | return -ESRCH; |
28a6d671 EB |
2468 | |
2469 | length = security_getprocattr(task, | |
2fddfeef | 2470 | (char*)file->f_path.dentry->d_name.name, |
04ff9708 | 2471 | &p); |
28a6d671 | 2472 | put_task_struct(task); |
04ff9708 AV |
2473 | if (length > 0) |
2474 | length = simple_read_from_buffer(buf, count, ppos, p, length); | |
2475 | kfree(p); | |
28a6d671 | 2476 | return length; |
1da177e4 LT |
2477 | } |
2478 | ||
28a6d671 EB |
2479 | static ssize_t proc_pid_attr_write(struct file * file, const char __user * buf, |
2480 | size_t count, loff_t *ppos) | |
2481 | { | |
496ad9aa | 2482 | struct inode * inode = file_inode(file); |
bb646cdb | 2483 | void *page; |
28a6d671 EB |
2484 | ssize_t length; |
2485 | struct task_struct *task = get_proc_task(inode); | |
2486 | ||
2487 | length = -ESRCH; | |
2488 | if (!task) | |
2489 | goto out_no_task; | |
2490 | if (count > PAGE_SIZE) | |
2491 | count = PAGE_SIZE; | |
2492 | ||
2493 | /* No partial writes. */ | |
2494 | length = -EINVAL; | |
2495 | if (*ppos != 0) | |
2496 | goto out; | |
2497 | ||
bb646cdb AV |
2498 | page = memdup_user(buf, count); |
2499 | if (IS_ERR(page)) { | |
2500 | length = PTR_ERR(page); | |
28a6d671 | 2501 | goto out; |
bb646cdb | 2502 | } |
28a6d671 | 2503 | |
107db7c7 | 2504 | /* Guard against adverse ptrace interaction */ |
9b1bf12d | 2505 | length = mutex_lock_interruptible(&task->signal->cred_guard_mutex); |
107db7c7 DH |
2506 | if (length < 0) |
2507 | goto out_free; | |
2508 | ||
28a6d671 | 2509 | length = security_setprocattr(task, |
2fddfeef | 2510 | (char*)file->f_path.dentry->d_name.name, |
bb646cdb | 2511 | page, count); |
9b1bf12d | 2512 | mutex_unlock(&task->signal->cred_guard_mutex); |
28a6d671 | 2513 | out_free: |
bb646cdb | 2514 | kfree(page); |
28a6d671 EB |
2515 | out: |
2516 | put_task_struct(task); | |
2517 | out_no_task: | |
2518 | return length; | |
2519 | } | |
2520 | ||
00977a59 | 2521 | static const struct file_operations proc_pid_attr_operations = { |
28a6d671 EB |
2522 | .read = proc_pid_attr_read, |
2523 | .write = proc_pid_attr_write, | |
87df8424 | 2524 | .llseek = generic_file_llseek, |
28a6d671 EB |
2525 | }; |
2526 | ||
c5141e6d | 2527 | static const struct pid_entry attr_dir_stuff[] = { |
631f9c18 AD |
2528 | REG("current", S_IRUGO|S_IWUGO, proc_pid_attr_operations), |
2529 | REG("prev", S_IRUGO, proc_pid_attr_operations), | |
2530 | REG("exec", S_IRUGO|S_IWUGO, proc_pid_attr_operations), | |
2531 | REG("fscreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations), | |
2532 | REG("keycreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations), | |
2533 | REG("sockcreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations), | |
28a6d671 EB |
2534 | }; |
2535 | ||
f0c3b509 | 2536 | static int proc_attr_dir_readdir(struct file *file, struct dir_context *ctx) |
28a6d671 | 2537 | { |
f0c3b509 AV |
2538 | return proc_pident_readdir(file, ctx, |
2539 | attr_dir_stuff, ARRAY_SIZE(attr_dir_stuff)); | |
28a6d671 EB |
2540 | } |
2541 | ||
00977a59 | 2542 | static const struct file_operations proc_attr_dir_operations = { |
1da177e4 | 2543 | .read = generic_read_dir, |
f50752ea AV |
2544 | .iterate_shared = proc_attr_dir_readdir, |
2545 | .llseek = generic_file_llseek, | |
1da177e4 LT |
2546 | }; |
2547 | ||
72d9dcfc | 2548 | static struct dentry *proc_attr_dir_lookup(struct inode *dir, |
00cd8dd3 | 2549 | struct dentry *dentry, unsigned int flags) |
28a6d671 | 2550 | { |
7bcd6b0e EB |
2551 | return proc_pident_lookup(dir, dentry, |
2552 | attr_dir_stuff, ARRAY_SIZE(attr_dir_stuff)); | |
28a6d671 EB |
2553 | } |
2554 | ||
c5ef1c42 | 2555 | static const struct inode_operations proc_attr_dir_inode_operations = { |
72d9dcfc | 2556 | .lookup = proc_attr_dir_lookup, |
99f89551 | 2557 | .getattr = pid_getattr, |
6d76fa58 | 2558 | .setattr = proc_setattr, |
1da177e4 LT |
2559 | }; |
2560 | ||
28a6d671 EB |
2561 | #endif |
2562 | ||
698ba7b5 | 2563 | #ifdef CONFIG_ELF_CORE |
3cb4a0bb KH |
2564 | static ssize_t proc_coredump_filter_read(struct file *file, char __user *buf, |
2565 | size_t count, loff_t *ppos) | |
2566 | { | |
496ad9aa | 2567 | struct task_struct *task = get_proc_task(file_inode(file)); |
3cb4a0bb KH |
2568 | struct mm_struct *mm; |
2569 | char buffer[PROC_NUMBUF]; | |
2570 | size_t len; | |
2571 | int ret; | |
2572 | ||
2573 | if (!task) | |
2574 | return -ESRCH; | |
2575 | ||
2576 | ret = 0; | |
2577 | mm = get_task_mm(task); | |
2578 | if (mm) { | |
2579 | len = snprintf(buffer, sizeof(buffer), "%08lx\n", | |
2580 | ((mm->flags & MMF_DUMP_FILTER_MASK) >> | |
2581 | MMF_DUMP_FILTER_SHIFT)); | |
2582 | mmput(mm); | |
2583 | ret = simple_read_from_buffer(buf, count, ppos, buffer, len); | |
2584 | } | |
2585 | ||
2586 | put_task_struct(task); | |
2587 | ||
2588 | return ret; | |
2589 | } | |
2590 | ||
2591 | static ssize_t proc_coredump_filter_write(struct file *file, | |
2592 | const char __user *buf, | |
2593 | size_t count, | |
2594 | loff_t *ppos) | |
2595 | { | |
2596 | struct task_struct *task; | |
2597 | struct mm_struct *mm; | |
3cb4a0bb KH |
2598 | unsigned int val; |
2599 | int ret; | |
2600 | int i; | |
2601 | unsigned long mask; | |
2602 | ||
774636e1 AD |
2603 | ret = kstrtouint_from_user(buf, count, 0, &val); |
2604 | if (ret < 0) | |
2605 | return ret; | |
3cb4a0bb KH |
2606 | |
2607 | ret = -ESRCH; | |
496ad9aa | 2608 | task = get_proc_task(file_inode(file)); |
3cb4a0bb KH |
2609 | if (!task) |
2610 | goto out_no_task; | |
2611 | ||
3cb4a0bb KH |
2612 | mm = get_task_mm(task); |
2613 | if (!mm) | |
2614 | goto out_no_mm; | |
41a0c249 | 2615 | ret = 0; |
3cb4a0bb KH |
2616 | |
2617 | for (i = 0, mask = 1; i < MMF_DUMP_FILTER_BITS; i++, mask <<= 1) { | |
2618 | if (val & mask) | |
2619 | set_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags); | |
2620 | else | |
2621 | clear_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags); | |
2622 | } | |
2623 | ||
2624 | mmput(mm); | |
2625 | out_no_mm: | |
2626 | put_task_struct(task); | |
2627 | out_no_task: | |
774636e1 AD |
2628 | if (ret < 0) |
2629 | return ret; | |
2630 | return count; | |
3cb4a0bb KH |
2631 | } |
2632 | ||
2633 | static const struct file_operations proc_coredump_filter_operations = { | |
2634 | .read = proc_coredump_filter_read, | |
2635 | .write = proc_coredump_filter_write, | |
87df8424 | 2636 | .llseek = generic_file_llseek, |
3cb4a0bb KH |
2637 | }; |
2638 | #endif | |
2639 | ||
aba76fdb | 2640 | #ifdef CONFIG_TASK_IO_ACCOUNTING |
19aadc98 | 2641 | static int do_io_accounting(struct task_struct *task, struct seq_file *m, int whole) |
297c5d92 | 2642 | { |
940389b8 | 2643 | struct task_io_accounting acct = task->ioac; |
5995477a | 2644 | unsigned long flags; |
293eb1e7 | 2645 | int result; |
5995477a | 2646 | |
293eb1e7 VK |
2647 | result = mutex_lock_killable(&task->signal->cred_guard_mutex); |
2648 | if (result) | |
2649 | return result; | |
2650 | ||
caaee623 | 2651 | if (!ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS)) { |
293eb1e7 VK |
2652 | result = -EACCES; |
2653 | goto out_unlock; | |
2654 | } | |
1d1221f3 | 2655 | |
5995477a AR |
2656 | if (whole && lock_task_sighand(task, &flags)) { |
2657 | struct task_struct *t = task; | |
2658 | ||
2659 | task_io_accounting_add(&acct, &task->signal->ioac); | |
2660 | while_each_thread(task, t) | |
2661 | task_io_accounting_add(&acct, &t->ioac); | |
2662 | ||
2663 | unlock_task_sighand(task, &flags); | |
297c5d92 | 2664 | } |
25ce3191 JP |
2665 | seq_printf(m, |
2666 | "rchar: %llu\n" | |
2667 | "wchar: %llu\n" | |
2668 | "syscr: %llu\n" | |
2669 | "syscw: %llu\n" | |
2670 | "read_bytes: %llu\n" | |
2671 | "write_bytes: %llu\n" | |
2672 | "cancelled_write_bytes: %llu\n", | |
2673 | (unsigned long long)acct.rchar, | |
2674 | (unsigned long long)acct.wchar, | |
2675 | (unsigned long long)acct.syscr, | |
2676 | (unsigned long long)acct.syscw, | |
2677 | (unsigned long long)acct.read_bytes, | |
2678 | (unsigned long long)acct.write_bytes, | |
2679 | (unsigned long long)acct.cancelled_write_bytes); | |
2680 | result = 0; | |
2681 | ||
293eb1e7 VK |
2682 | out_unlock: |
2683 | mutex_unlock(&task->signal->cred_guard_mutex); | |
2684 | return result; | |
297c5d92 AR |
2685 | } |
2686 | ||
19aadc98 AD |
2687 | static int proc_tid_io_accounting(struct seq_file *m, struct pid_namespace *ns, |
2688 | struct pid *pid, struct task_struct *task) | |
297c5d92 | 2689 | { |
19aadc98 | 2690 | return do_io_accounting(task, m, 0); |
aba76fdb | 2691 | } |
297c5d92 | 2692 | |
19aadc98 AD |
2693 | static int proc_tgid_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, 1); |
297c5d92 AR |
2697 | } |
2698 | #endif /* CONFIG_TASK_IO_ACCOUNTING */ | |
aba76fdb | 2699 | |
22d917d8 EB |
2700 | #ifdef CONFIG_USER_NS |
2701 | static int proc_id_map_open(struct inode *inode, struct file *file, | |
ccf94f1b | 2702 | const struct seq_operations *seq_ops) |
22d917d8 EB |
2703 | { |
2704 | struct user_namespace *ns = NULL; | |
2705 | struct task_struct *task; | |
2706 | struct seq_file *seq; | |
2707 | int ret = -EINVAL; | |
2708 | ||
2709 | task = get_proc_task(inode); | |
2710 | if (task) { | |
2711 | rcu_read_lock(); | |
2712 | ns = get_user_ns(task_cred_xxx(task, user_ns)); | |
2713 | rcu_read_unlock(); | |
2714 | put_task_struct(task); | |
2715 | } | |
2716 | if (!ns) | |
2717 | goto err; | |
2718 | ||
2719 | ret = seq_open(file, seq_ops); | |
2720 | if (ret) | |
2721 | goto err_put_ns; | |
2722 | ||
2723 | seq = file->private_data; | |
2724 | seq->private = ns; | |
2725 | ||
2726 | return 0; | |
2727 | err_put_ns: | |
2728 | put_user_ns(ns); | |
2729 | err: | |
2730 | return ret; | |
2731 | } | |
2732 | ||
2733 | static int proc_id_map_release(struct inode *inode, struct file *file) | |
2734 | { | |
2735 | struct seq_file *seq = file->private_data; | |
2736 | struct user_namespace *ns = seq->private; | |
2737 | put_user_ns(ns); | |
2738 | return seq_release(inode, file); | |
2739 | } | |
2740 | ||
2741 | static int proc_uid_map_open(struct inode *inode, struct file *file) | |
2742 | { | |
2743 | return proc_id_map_open(inode, file, &proc_uid_seq_operations); | |
2744 | } | |
2745 | ||
2746 | static int proc_gid_map_open(struct inode *inode, struct file *file) | |
2747 | { | |
2748 | return proc_id_map_open(inode, file, &proc_gid_seq_operations); | |
2749 | } | |
2750 | ||
f76d207a EB |
2751 | static int proc_projid_map_open(struct inode *inode, struct file *file) |
2752 | { | |
2753 | return proc_id_map_open(inode, file, &proc_projid_seq_operations); | |
2754 | } | |
2755 | ||
22d917d8 EB |
2756 | static const struct file_operations proc_uid_map_operations = { |
2757 | .open = proc_uid_map_open, | |
2758 | .write = proc_uid_map_write, | |
2759 | .read = seq_read, | |
2760 | .llseek = seq_lseek, | |
2761 | .release = proc_id_map_release, | |
2762 | }; | |
2763 | ||
2764 | static const struct file_operations proc_gid_map_operations = { | |
2765 | .open = proc_gid_map_open, | |
2766 | .write = proc_gid_map_write, | |
2767 | .read = seq_read, | |
2768 | .llseek = seq_lseek, | |
2769 | .release = proc_id_map_release, | |
2770 | }; | |
f76d207a EB |
2771 | |
2772 | static const struct file_operations proc_projid_map_operations = { | |
2773 | .open = proc_projid_map_open, | |
2774 | .write = proc_projid_map_write, | |
2775 | .read = seq_read, | |
2776 | .llseek = seq_lseek, | |
2777 | .release = proc_id_map_release, | |
2778 | }; | |
9cc46516 EB |
2779 | |
2780 | static int proc_setgroups_open(struct inode *inode, struct file *file) | |
2781 | { | |
2782 | struct user_namespace *ns = NULL; | |
2783 | struct task_struct *task; | |
2784 | int ret; | |
2785 | ||
2786 | ret = -ESRCH; | |
2787 | task = get_proc_task(inode); | |
2788 | if (task) { | |
2789 | rcu_read_lock(); | |
2790 | ns = get_user_ns(task_cred_xxx(task, user_ns)); | |
2791 | rcu_read_unlock(); | |
2792 | put_task_struct(task); | |
2793 | } | |
2794 | if (!ns) | |
2795 | goto err; | |
2796 | ||
2797 | if (file->f_mode & FMODE_WRITE) { | |
2798 | ret = -EACCES; | |
2799 | if (!ns_capable(ns, CAP_SYS_ADMIN)) | |
2800 | goto err_put_ns; | |
2801 | } | |
2802 | ||
2803 | ret = single_open(file, &proc_setgroups_show, ns); | |
2804 | if (ret) | |
2805 | goto err_put_ns; | |
2806 | ||
2807 | return 0; | |
2808 | err_put_ns: | |
2809 | put_user_ns(ns); | |
2810 | err: | |
2811 | return ret; | |
2812 | } | |
2813 | ||
2814 | static int proc_setgroups_release(struct inode *inode, struct file *file) | |
2815 | { | |
2816 | struct seq_file *seq = file->private_data; | |
2817 | struct user_namespace *ns = seq->private; | |
2818 | int ret = single_release(inode, file); | |
2819 | put_user_ns(ns); | |
2820 | return ret; | |
2821 | } | |
2822 | ||
2823 | static const struct file_operations proc_setgroups_operations = { | |
2824 | .open = proc_setgroups_open, | |
2825 | .write = proc_setgroups_write, | |
2826 | .read = seq_read, | |
2827 | .llseek = seq_lseek, | |
2828 | .release = proc_setgroups_release, | |
2829 | }; | |
22d917d8 EB |
2830 | #endif /* CONFIG_USER_NS */ |
2831 | ||
47830723 KC |
2832 | static int proc_pid_personality(struct seq_file *m, struct pid_namespace *ns, |
2833 | struct pid *pid, struct task_struct *task) | |
2834 | { | |
a9712bc1 AV |
2835 | int err = lock_trace(task); |
2836 | if (!err) { | |
2837 | seq_printf(m, "%08x\n", task->personality); | |
2838 | unlock_trace(task); | |
2839 | } | |
2840 | return err; | |
47830723 KC |
2841 | } |
2842 | ||
28a6d671 EB |
2843 | /* |
2844 | * Thread groups | |
2845 | */ | |
00977a59 | 2846 | static const struct file_operations proc_task_operations; |
c5ef1c42 | 2847 | static const struct inode_operations proc_task_inode_operations; |
20cdc894 | 2848 | |
c5141e6d | 2849 | static const struct pid_entry tgid_base_stuff[] = { |
631f9c18 AD |
2850 | DIR("task", S_IRUGO|S_IXUGO, proc_task_inode_operations, proc_task_operations), |
2851 | DIR("fd", S_IRUSR|S_IXUSR, proc_fd_inode_operations, proc_fd_operations), | |
640708a2 | 2852 | DIR("map_files", S_IRUSR|S_IXUSR, proc_map_files_inode_operations, proc_map_files_operations), |
631f9c18 | 2853 | DIR("fdinfo", S_IRUSR|S_IXUSR, proc_fdinfo_inode_operations, proc_fdinfo_operations), |
6b4e306a | 2854 | DIR("ns", S_IRUSR|S_IXUGO, proc_ns_dir_inode_operations, proc_ns_dir_operations), |
b2211a36 | 2855 | #ifdef CONFIG_NET |
631f9c18 | 2856 | DIR("net", S_IRUGO|S_IXUGO, proc_net_inode_operations, proc_net_operations), |
b2211a36 | 2857 | #endif |
631f9c18 | 2858 | REG("environ", S_IRUSR, proc_environ_operations), |
c5317167 | 2859 | REG("auxv", S_IRUSR, proc_auxv_operations), |
631f9c18 | 2860 | ONE("status", S_IRUGO, proc_pid_status), |
35a35046 | 2861 | ONE("personality", S_IRUSR, proc_pid_personality), |
1c963eb1 | 2862 | ONE("limits", S_IRUGO, proc_pid_limits), |
43ae34cb | 2863 | #ifdef CONFIG_SCHED_DEBUG |
631f9c18 | 2864 | REG("sched", S_IRUGO|S_IWUSR, proc_pid_sched_operations), |
5091faa4 MG |
2865 | #endif |
2866 | #ifdef CONFIG_SCHED_AUTOGROUP | |
2867 | REG("autogroup", S_IRUGO|S_IWUSR, proc_pid_sched_autogroup_operations), | |
ebcb6734 | 2868 | #endif |
4614a696 | 2869 | REG("comm", S_IRUGO|S_IWUSR, proc_pid_set_comm_operations), |
ebcb6734 | 2870 | #ifdef CONFIG_HAVE_ARCH_TRACEHOOK |
09d93bd6 | 2871 | ONE("syscall", S_IRUSR, proc_pid_syscall), |
43ae34cb | 2872 | #endif |
c2c0bb44 | 2873 | REG("cmdline", S_IRUGO, proc_pid_cmdline_ops), |
631f9c18 AD |
2874 | ONE("stat", S_IRUGO, proc_tgid_stat), |
2875 | ONE("statm", S_IRUGO, proc_pid_statm), | |
b7643757 | 2876 | REG("maps", S_IRUGO, proc_pid_maps_operations), |
28a6d671 | 2877 | #ifdef CONFIG_NUMA |
b7643757 | 2878 | REG("numa_maps", S_IRUGO, proc_pid_numa_maps_operations), |
28a6d671 | 2879 | #endif |
631f9c18 AD |
2880 | REG("mem", S_IRUSR|S_IWUSR, proc_mem_operations), |
2881 | LNK("cwd", proc_cwd_link), | |
2882 | LNK("root", proc_root_link), | |
2883 | LNK("exe", proc_exe_link), | |
2884 | REG("mounts", S_IRUGO, proc_mounts_operations), | |
2885 | REG("mountinfo", S_IRUGO, proc_mountinfo_operations), | |
2886 | REG("mountstats", S_IRUSR, proc_mountstats_operations), | |
1e883281 | 2887 | #ifdef CONFIG_PROC_PAGE_MONITOR |
631f9c18 | 2888 | REG("clear_refs", S_IWUSR, proc_clear_refs_operations), |
b7643757 | 2889 | REG("smaps", S_IRUGO, proc_pid_smaps_operations), |
32ed74a4 | 2890 | REG("pagemap", S_IRUSR, proc_pagemap_operations), |
28a6d671 EB |
2891 | #endif |
2892 | #ifdef CONFIG_SECURITY | |
631f9c18 | 2893 | DIR("attr", S_IRUGO|S_IXUGO, proc_attr_dir_inode_operations, proc_attr_dir_operations), |
28a6d671 EB |
2894 | #endif |
2895 | #ifdef CONFIG_KALLSYMS | |
edfcd606 | 2896 | ONE("wchan", S_IRUGO, proc_pid_wchan), |
28a6d671 | 2897 | #endif |
2ec220e2 | 2898 | #ifdef CONFIG_STACKTRACE |
35a35046 | 2899 | ONE("stack", S_IRUSR, proc_pid_stack), |
28a6d671 | 2900 | #endif |
5968cece | 2901 | #ifdef CONFIG_SCHED_INFO |
f6e826ca | 2902 | ONE("schedstat", S_IRUGO, proc_pid_schedstat), |
28a6d671 | 2903 | #endif |
9745512c | 2904 | #ifdef CONFIG_LATENCYTOP |
631f9c18 | 2905 | REG("latency", S_IRUGO, proc_lstats_operations), |
9745512c | 2906 | #endif |
8793d854 | 2907 | #ifdef CONFIG_PROC_PID_CPUSET |
52de4779 | 2908 | ONE("cpuset", S_IRUGO, proc_cpuset_show), |
a424316c PM |
2909 | #endif |
2910 | #ifdef CONFIG_CGROUPS | |
006f4ac4 | 2911 | ONE("cgroup", S_IRUGO, proc_cgroup_show), |
28a6d671 | 2912 | #endif |
6ba51e37 | 2913 | ONE("oom_score", S_IRUGO, proc_oom_score), |
fa0cbbf1 | 2914 | REG("oom_adj", S_IRUGO|S_IWUSR, proc_oom_adj_operations), |
a63d83f4 | 2915 | REG("oom_score_adj", S_IRUGO|S_IWUSR, proc_oom_score_adj_operations), |
28a6d671 | 2916 | #ifdef CONFIG_AUDITSYSCALL |
631f9c18 AD |
2917 | REG("loginuid", S_IWUSR|S_IRUGO, proc_loginuid_operations), |
2918 | REG("sessionid", S_IRUGO, proc_sessionid_operations), | |
28a6d671 | 2919 | #endif |
f4f154fd | 2920 | #ifdef CONFIG_FAULT_INJECTION |
631f9c18 | 2921 | REG("make-it-fail", S_IRUGO|S_IWUSR, proc_fault_inject_operations), |
f4f154fd | 2922 | #endif |
698ba7b5 | 2923 | #ifdef CONFIG_ELF_CORE |
631f9c18 | 2924 | REG("coredump_filter", S_IRUGO|S_IWUSR, proc_coredump_filter_operations), |
3cb4a0bb | 2925 | #endif |
aba76fdb | 2926 | #ifdef CONFIG_TASK_IO_ACCOUNTING |
19aadc98 | 2927 | ONE("io", S_IRUSR, proc_tgid_io_accounting), |
aba76fdb | 2928 | #endif |
f133ecca | 2929 | #ifdef CONFIG_HARDWALL |
d962c144 | 2930 | ONE("hardwall", S_IRUGO, proc_pid_hardwall), |
f133ecca | 2931 | #endif |
22d917d8 EB |
2932 | #ifdef CONFIG_USER_NS |
2933 | REG("uid_map", S_IRUGO|S_IWUSR, proc_uid_map_operations), | |
2934 | REG("gid_map", S_IRUGO|S_IWUSR, proc_gid_map_operations), | |
f76d207a | 2935 | REG("projid_map", S_IRUGO|S_IWUSR, proc_projid_map_operations), |
9cc46516 | 2936 | REG("setgroups", S_IRUGO|S_IWUSR, proc_setgroups_operations), |
22d917d8 | 2937 | #endif |
48f6a7a5 PE |
2938 | #ifdef CONFIG_CHECKPOINT_RESTORE |
2939 | REG("timers", S_IRUGO, proc_timers_operations), | |
2940 | #endif | |
5de23d43 | 2941 | REG("timerslack_ns", S_IRUGO|S_IWUGO, proc_pid_set_timerslack_ns_operations), |
28a6d671 | 2942 | }; |
1da177e4 | 2943 | |
f0c3b509 | 2944 | static int proc_tgid_base_readdir(struct file *file, struct dir_context *ctx) |
1da177e4 | 2945 | { |
f0c3b509 AV |
2946 | return proc_pident_readdir(file, ctx, |
2947 | tgid_base_stuff, ARRAY_SIZE(tgid_base_stuff)); | |
1da177e4 LT |
2948 | } |
2949 | ||
00977a59 | 2950 | static const struct file_operations proc_tgid_base_operations = { |
1da177e4 | 2951 | .read = generic_read_dir, |
f50752ea AV |
2952 | .iterate_shared = proc_tgid_base_readdir, |
2953 | .llseek = generic_file_llseek, | |
1da177e4 LT |
2954 | }; |
2955 | ||
00cd8dd3 AV |
2956 | static struct dentry *proc_tgid_base_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags) |
2957 | { | |
7bcd6b0e EB |
2958 | return proc_pident_lookup(dir, dentry, |
2959 | tgid_base_stuff, ARRAY_SIZE(tgid_base_stuff)); | |
1da177e4 LT |
2960 | } |
2961 | ||
c5ef1c42 | 2962 | static const struct inode_operations proc_tgid_base_inode_operations = { |
28a6d671 | 2963 | .lookup = proc_tgid_base_lookup, |
99f89551 | 2964 | .getattr = pid_getattr, |
6d76fa58 | 2965 | .setattr = proc_setattr, |
0499680a | 2966 | .permission = proc_pid_permission, |
1da177e4 | 2967 | }; |
1da177e4 | 2968 | |
60347f67 | 2969 | static void proc_flush_task_mnt(struct vfsmount *mnt, pid_t pid, pid_t tgid) |
1da177e4 | 2970 | { |
48e6484d | 2971 | struct dentry *dentry, *leader, *dir; |
8578cea7 | 2972 | char buf[PROC_NUMBUF]; |
48e6484d EB |
2973 | struct qstr name; |
2974 | ||
2975 | name.name = buf; | |
60347f67 | 2976 | name.len = snprintf(buf, sizeof(buf), "%d", pid); |
4f522a24 | 2977 | /* no ->d_hash() rejects on procfs */ |
60347f67 | 2978 | dentry = d_hash_and_lookup(mnt->mnt_root, &name); |
48e6484d | 2979 | if (dentry) { |
bbd51924 | 2980 | d_invalidate(dentry); |
48e6484d EB |
2981 | dput(dentry); |
2982 | } | |
1da177e4 | 2983 | |
c35a7f18 ON |
2984 | if (pid == tgid) |
2985 | return; | |
2986 | ||
48e6484d | 2987 | name.name = buf; |
60347f67 PE |
2988 | name.len = snprintf(buf, sizeof(buf), "%d", tgid); |
2989 | leader = d_hash_and_lookup(mnt->mnt_root, &name); | |
48e6484d EB |
2990 | if (!leader) |
2991 | goto out; | |
1da177e4 | 2992 | |
48e6484d EB |
2993 | name.name = "task"; |
2994 | name.len = strlen(name.name); | |
2995 | dir = d_hash_and_lookup(leader, &name); | |
2996 | if (!dir) | |
2997 | goto out_put_leader; | |
2998 | ||
2999 | name.name = buf; | |
60347f67 | 3000 | name.len = snprintf(buf, sizeof(buf), "%d", pid); |
48e6484d EB |
3001 | dentry = d_hash_and_lookup(dir, &name); |
3002 | if (dentry) { | |
bbd51924 | 3003 | d_invalidate(dentry); |
48e6484d | 3004 | dput(dentry); |
1da177e4 | 3005 | } |
48e6484d EB |
3006 | |
3007 | dput(dir); | |
3008 | out_put_leader: | |
3009 | dput(leader); | |
3010 | out: | |
3011 | return; | |
1da177e4 LT |
3012 | } |
3013 | ||
0895e91d RD |
3014 | /** |
3015 | * proc_flush_task - Remove dcache entries for @task from the /proc dcache. | |
3016 | * @task: task that should be flushed. | |
3017 | * | |
3018 | * When flushing dentries from proc, one needs to flush them from global | |
60347f67 | 3019 | * proc (proc_mnt) and from all the namespaces' procs this task was seen |
0895e91d RD |
3020 | * in. This call is supposed to do all of this job. |
3021 | * | |
3022 | * Looks in the dcache for | |
3023 | * /proc/@pid | |
3024 | * /proc/@tgid/task/@pid | |
3025 | * if either directory is present flushes it and all of it'ts children | |
3026 | * from the dcache. | |
3027 | * | |
3028 | * It is safe and reasonable to cache /proc entries for a task until | |
3029 | * that task exits. After that they just clog up the dcache with | |
3030 | * useless entries, possibly causing useful dcache entries to be | |
3031 | * flushed instead. This routine is proved to flush those useless | |
3032 | * dcache entries at process exit time. | |
3033 | * | |
3034 | * NOTE: This routine is just an optimization so it does not guarantee | |
3035 | * that no dcache entries will exist at process exit time it | |
3036 | * just makes it very unlikely that any will persist. | |
60347f67 PE |
3037 | */ |
3038 | ||
3039 | void proc_flush_task(struct task_struct *task) | |
3040 | { | |
9fcc2d15 | 3041 | int i; |
9b4d1cbe | 3042 | struct pid *pid, *tgid; |
130f77ec PE |
3043 | struct upid *upid; |
3044 | ||
130f77ec | 3045 | pid = task_pid(task); |
9b4d1cbe | 3046 | tgid = task_tgid(task); |
130f77ec | 3047 | |
9fcc2d15 | 3048 | for (i = 0; i <= pid->level; i++) { |
130f77ec PE |
3049 | upid = &pid->numbers[i]; |
3050 | proc_flush_task_mnt(upid->ns->proc_mnt, upid->nr, | |
9b4d1cbe | 3051 | tgid->numbers[i].nr); |
130f77ec | 3052 | } |
60347f67 PE |
3053 | } |
3054 | ||
c52a47ac AV |
3055 | static int proc_pid_instantiate(struct inode *dir, |
3056 | struct dentry * dentry, | |
3057 | struct task_struct *task, const void *ptr) | |
444ceed8 | 3058 | { |
444ceed8 EB |
3059 | struct inode *inode; |
3060 | ||
61a28784 | 3061 | inode = proc_pid_make_inode(dir->i_sb, task); |
444ceed8 EB |
3062 | if (!inode) |
3063 | goto out; | |
3064 | ||
3065 | inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO; | |
3066 | inode->i_op = &proc_tgid_base_inode_operations; | |
3067 | inode->i_fop = &proc_tgid_base_operations; | |
3068 | inode->i_flags|=S_IMMUTABLE; | |
aed54175 | 3069 | |
bfe86848 MS |
3070 | set_nlink(inode, 2 + pid_entry_count_dirs(tgid_base_stuff, |
3071 | ARRAY_SIZE(tgid_base_stuff))); | |
444ceed8 | 3072 | |
fb045adb | 3073 | d_set_d_op(dentry, &pid_dentry_operations); |
444ceed8 EB |
3074 | |
3075 | d_add(dentry, inode); | |
3076 | /* Close the race of the process dying before we return the dentry */ | |
0b728e19 | 3077 | if (pid_revalidate(dentry, 0)) |
c52a47ac | 3078 | return 0; |
444ceed8 | 3079 | out: |
c52a47ac | 3080 | return -ENOENT; |
444ceed8 EB |
3081 | } |
3082 | ||
00cd8dd3 | 3083 | struct dentry *proc_pid_lookup(struct inode *dir, struct dentry * dentry, unsigned int flags) |
1da177e4 | 3084 | { |
335eb531 | 3085 | int result = -ENOENT; |
1da177e4 | 3086 | struct task_struct *task; |
1da177e4 | 3087 | unsigned tgid; |
b488893a | 3088 | struct pid_namespace *ns; |
1da177e4 | 3089 | |
dbcdb504 | 3090 | tgid = name_to_int(&dentry->d_name); |
1da177e4 LT |
3091 | if (tgid == ~0U) |
3092 | goto out; | |
3093 | ||
b488893a | 3094 | ns = dentry->d_sb->s_fs_info; |
de758734 | 3095 | rcu_read_lock(); |
b488893a | 3096 | task = find_task_by_pid_ns(tgid, ns); |
1da177e4 LT |
3097 | if (task) |
3098 | get_task_struct(task); | |
de758734 | 3099 | rcu_read_unlock(); |
1da177e4 LT |
3100 | if (!task) |
3101 | goto out; | |
3102 | ||
444ceed8 | 3103 | result = proc_pid_instantiate(dir, dentry, task, NULL); |
1da177e4 | 3104 | put_task_struct(task); |
1da177e4 | 3105 | out: |
c52a47ac | 3106 | return ERR_PTR(result); |
1da177e4 LT |
3107 | } |
3108 | ||
1da177e4 | 3109 | /* |
0804ef4b | 3110 | * Find the first task with tgid >= tgid |
0bc58a91 | 3111 | * |
1da177e4 | 3112 | */ |
19fd4bb2 EB |
3113 | struct tgid_iter { |
3114 | unsigned int tgid; | |
0804ef4b | 3115 | struct task_struct *task; |
19fd4bb2 EB |
3116 | }; |
3117 | static struct tgid_iter next_tgid(struct pid_namespace *ns, struct tgid_iter iter) | |
3118 | { | |
0804ef4b | 3119 | struct pid *pid; |
1da177e4 | 3120 | |
19fd4bb2 EB |
3121 | if (iter.task) |
3122 | put_task_struct(iter.task); | |
454cc105 | 3123 | rcu_read_lock(); |
0804ef4b | 3124 | retry: |
19fd4bb2 EB |
3125 | iter.task = NULL; |
3126 | pid = find_ge_pid(iter.tgid, ns); | |
0804ef4b | 3127 | if (pid) { |
19fd4bb2 EB |
3128 | iter.tgid = pid_nr_ns(pid, ns); |
3129 | iter.task = pid_task(pid, PIDTYPE_PID); | |
0804ef4b EB |
3130 | /* What we to know is if the pid we have find is the |
3131 | * pid of a thread_group_leader. Testing for task | |
3132 | * being a thread_group_leader is the obvious thing | |
3133 | * todo but there is a window when it fails, due to | |
3134 | * the pid transfer logic in de_thread. | |
3135 | * | |
3136 | * So we perform the straight forward test of seeing | |
3137 | * if the pid we have found is the pid of a thread | |
3138 | * group leader, and don't worry if the task we have | |
3139 | * found doesn't happen to be a thread group leader. | |
3140 | * As we don't care in the case of readdir. | |
3141 | */ | |
19fd4bb2 EB |
3142 | if (!iter.task || !has_group_leader_pid(iter.task)) { |
3143 | iter.tgid += 1; | |
0804ef4b | 3144 | goto retry; |
19fd4bb2 EB |
3145 | } |
3146 | get_task_struct(iter.task); | |
0bc58a91 | 3147 | } |
454cc105 | 3148 | rcu_read_unlock(); |
19fd4bb2 | 3149 | return iter; |
1da177e4 LT |
3150 | } |
3151 | ||
0097875b | 3152 | #define TGID_OFFSET (FIRST_PROCESS_ENTRY + 2) |
0804ef4b | 3153 | |
1da177e4 | 3154 | /* for the /proc/ directory itself, after non-process stuff has been done */ |
f0c3b509 | 3155 | int proc_pid_readdir(struct file *file, struct dir_context *ctx) |
1da177e4 | 3156 | { |
19fd4bb2 | 3157 | struct tgid_iter iter; |
3aa3377f | 3158 | struct pid_namespace *ns = file_inode(file)->i_sb->s_fs_info; |
f0c3b509 | 3159 | loff_t pos = ctx->pos; |
1da177e4 | 3160 | |
021ada7d | 3161 | if (pos >= PID_MAX_LIMIT + TGID_OFFSET) |
f0c3b509 | 3162 | return 0; |
1da177e4 | 3163 | |
0097875b | 3164 | if (pos == TGID_OFFSET - 2) { |
2b0143b5 | 3165 | struct inode *inode = d_inode(ns->proc_self); |
db963164 | 3166 | if (!dir_emit(ctx, "self", 4, inode->i_ino, DT_LNK)) |
f0c3b509 | 3167 | return 0; |
0097875b EB |
3168 | ctx->pos = pos = pos + 1; |
3169 | } | |
3170 | if (pos == TGID_OFFSET - 1) { | |
2b0143b5 | 3171 | struct inode *inode = d_inode(ns->proc_thread_self); |
0097875b EB |
3172 | if (!dir_emit(ctx, "thread-self", 11, inode->i_ino, DT_LNK)) |
3173 | return 0; | |
3174 | ctx->pos = pos = pos + 1; | |
021ada7d | 3175 | } |
0097875b | 3176 | iter.tgid = pos - TGID_OFFSET; |
19fd4bb2 | 3177 | iter.task = NULL; |
19fd4bb2 EB |
3178 | for (iter = next_tgid(ns, iter); |
3179 | iter.task; | |
3180 | iter.tgid += 1, iter = next_tgid(ns, iter)) { | |
f0c3b509 AV |
3181 | char name[PROC_NUMBUF]; |
3182 | int len; | |
3183 | if (!has_pid_permissions(ns, iter.task, 2)) | |
3184 | continue; | |
0499680a | 3185 | |
f0c3b509 AV |
3186 | len = snprintf(name, sizeof(name), "%d", iter.tgid); |
3187 | ctx->pos = iter.tgid + TGID_OFFSET; | |
3188 | if (!proc_fill_cache(file, ctx, name, len, | |
3189 | proc_pid_instantiate, iter.task, NULL)) { | |
19fd4bb2 | 3190 | put_task_struct(iter.task); |
f0c3b509 | 3191 | return 0; |
1da177e4 | 3192 | } |
0bc58a91 | 3193 | } |
f0c3b509 | 3194 | ctx->pos = PID_MAX_LIMIT + TGID_OFFSET; |
0bc58a91 EB |
3195 | return 0; |
3196 | } | |
1da177e4 | 3197 | |
1b3044e3 JD |
3198 | /* |
3199 | * proc_tid_comm_permission is a special permission function exclusively | |
3200 | * used for the node /proc/<pid>/task/<tid>/comm. | |
3201 | * It bypasses generic permission checks in the case where a task of the same | |
3202 | * task group attempts to access the node. | |
3203 | * The rationale behind this is that glibc and bionic access this node for | |
3204 | * cross thread naming (pthread_set/getname_np(!self)). However, if | |
3205 | * PR_SET_DUMPABLE gets set to 0 this node among others becomes uid=0 gid=0, | |
3206 | * which locks out the cross thread naming implementation. | |
3207 | * This function makes sure that the node is always accessible for members of | |
3208 | * same thread group. | |
3209 | */ | |
3210 | static int proc_tid_comm_permission(struct inode *inode, int mask) | |
3211 | { | |
3212 | bool is_same_tgroup; | |
3213 | struct task_struct *task; | |
3214 | ||
3215 | task = get_proc_task(inode); | |
3216 | if (!task) | |
3217 | return -ESRCH; | |
3218 | is_same_tgroup = same_thread_group(current, task); | |
3219 | put_task_struct(task); | |
3220 | ||
3221 | if (likely(is_same_tgroup && !(mask & MAY_EXEC))) { | |
3222 | /* This file (/proc/<pid>/task/<tid>/comm) can always be | |
3223 | * read or written by the members of the corresponding | |
3224 | * thread group. | |
3225 | */ | |
3226 | return 0; | |
3227 | } | |
3228 | ||
3229 | return generic_permission(inode, mask); | |
3230 | } | |
3231 | ||
3232 | static const struct inode_operations proc_tid_comm_inode_operations = { | |
3233 | .permission = proc_tid_comm_permission, | |
3234 | }; | |
3235 | ||
28a6d671 EB |
3236 | /* |
3237 | * Tasks | |
3238 | */ | |
c5141e6d | 3239 | static const struct pid_entry tid_base_stuff[] = { |
631f9c18 | 3240 | DIR("fd", S_IRUSR|S_IXUSR, proc_fd_inode_operations, proc_fd_operations), |
3835541d | 3241 | DIR("fdinfo", S_IRUSR|S_IXUSR, proc_fdinfo_inode_operations, proc_fdinfo_operations), |
6b4e306a | 3242 | DIR("ns", S_IRUSR|S_IXUGO, proc_ns_dir_inode_operations, proc_ns_dir_operations), |
6ba8ed79 EB |
3243 | #ifdef CONFIG_NET |
3244 | DIR("net", S_IRUGO|S_IXUGO, proc_net_inode_operations, proc_net_operations), | |
3245 | #endif | |
631f9c18 | 3246 | REG("environ", S_IRUSR, proc_environ_operations), |
c5317167 | 3247 | REG("auxv", S_IRUSR, proc_auxv_operations), |
631f9c18 | 3248 | ONE("status", S_IRUGO, proc_pid_status), |
35a35046 | 3249 | ONE("personality", S_IRUSR, proc_pid_personality), |
1c963eb1 | 3250 | ONE("limits", S_IRUGO, proc_pid_limits), |
43ae34cb | 3251 | #ifdef CONFIG_SCHED_DEBUG |
631f9c18 | 3252 | REG("sched", S_IRUGO|S_IWUSR, proc_pid_sched_operations), |
ebcb6734 | 3253 | #endif |
1b3044e3 JD |
3254 | NOD("comm", S_IFREG|S_IRUGO|S_IWUSR, |
3255 | &proc_tid_comm_inode_operations, | |
3256 | &proc_pid_set_comm_operations, {}), | |
ebcb6734 | 3257 | #ifdef CONFIG_HAVE_ARCH_TRACEHOOK |
09d93bd6 | 3258 | ONE("syscall", S_IRUSR, proc_pid_syscall), |
43ae34cb | 3259 | #endif |
c2c0bb44 | 3260 | REG("cmdline", S_IRUGO, proc_pid_cmdline_ops), |
631f9c18 AD |
3261 | ONE("stat", S_IRUGO, proc_tid_stat), |
3262 | ONE("statm", S_IRUGO, proc_pid_statm), | |
b7643757 | 3263 | REG("maps", S_IRUGO, proc_tid_maps_operations), |
2e13ba54 | 3264 | #ifdef CONFIG_PROC_CHILDREN |
81841161 CG |
3265 | REG("children", S_IRUGO, proc_tid_children_operations), |
3266 | #endif | |
28a6d671 | 3267 | #ifdef CONFIG_NUMA |
b7643757 | 3268 | REG("numa_maps", S_IRUGO, proc_tid_numa_maps_operations), |
28a6d671 | 3269 | #endif |
631f9c18 AD |
3270 | REG("mem", S_IRUSR|S_IWUSR, proc_mem_operations), |
3271 | LNK("cwd", proc_cwd_link), | |
3272 | LNK("root", proc_root_link), | |
3273 | LNK("exe", proc_exe_link), | |
3274 | REG("mounts", S_IRUGO, proc_mounts_operations), | |
3275 | REG("mountinfo", S_IRUGO, proc_mountinfo_operations), | |
1e883281 | 3276 | #ifdef CONFIG_PROC_PAGE_MONITOR |
631f9c18 | 3277 | REG("clear_refs", S_IWUSR, proc_clear_refs_operations), |
b7643757 | 3278 | REG("smaps", S_IRUGO, proc_tid_smaps_operations), |
32ed74a4 | 3279 | REG("pagemap", S_IRUSR, proc_pagemap_operations), |
28a6d671 EB |
3280 | #endif |
3281 | #ifdef CONFIG_SECURITY | |
631f9c18 | 3282 | DIR("attr", S_IRUGO|S_IXUGO, proc_attr_dir_inode_operations, proc_attr_dir_operations), |
28a6d671 EB |
3283 | #endif |
3284 | #ifdef CONFIG_KALLSYMS | |
edfcd606 | 3285 | ONE("wchan", S_IRUGO, proc_pid_wchan), |
28a6d671 | 3286 | #endif |
2ec220e2 | 3287 | #ifdef CONFIG_STACKTRACE |
35a35046 | 3288 | ONE("stack", S_IRUSR, proc_pid_stack), |
28a6d671 | 3289 | #endif |
5968cece | 3290 | #ifdef CONFIG_SCHED_INFO |
f6e826ca | 3291 | ONE("schedstat", S_IRUGO, proc_pid_schedstat), |
28a6d671 | 3292 | #endif |
9745512c | 3293 | #ifdef CONFIG_LATENCYTOP |
631f9c18 | 3294 | REG("latency", S_IRUGO, proc_lstats_operations), |
9745512c | 3295 | #endif |
8793d854 | 3296 | #ifdef CONFIG_PROC_PID_CPUSET |
52de4779 | 3297 | ONE("cpuset", S_IRUGO, proc_cpuset_show), |
a424316c PM |
3298 | #endif |
3299 | #ifdef CONFIG_CGROUPS | |
006f4ac4 | 3300 | ONE("cgroup", S_IRUGO, proc_cgroup_show), |
28a6d671 | 3301 | #endif |
6ba51e37 | 3302 | ONE("oom_score", S_IRUGO, proc_oom_score), |
fa0cbbf1 | 3303 | REG("oom_adj", S_IRUGO|S_IWUSR, proc_oom_adj_operations), |
a63d83f4 | 3304 | REG("oom_score_adj", S_IRUGO|S_IWUSR, proc_oom_score_adj_operations), |
28a6d671 | 3305 | #ifdef CONFIG_AUDITSYSCALL |
631f9c18 | 3306 | REG("loginuid", S_IWUSR|S_IRUGO, proc_loginuid_operations), |
26ec3c64 | 3307 | REG("sessionid", S_IRUGO, proc_sessionid_operations), |
28a6d671 | 3308 | #endif |
f4f154fd | 3309 | #ifdef CONFIG_FAULT_INJECTION |
631f9c18 | 3310 | REG("make-it-fail", S_IRUGO|S_IWUSR, proc_fault_inject_operations), |
f4f154fd | 3311 | #endif |
297c5d92 | 3312 | #ifdef CONFIG_TASK_IO_ACCOUNTING |
19aadc98 | 3313 | ONE("io", S_IRUSR, proc_tid_io_accounting), |
297c5d92 | 3314 | #endif |
f133ecca | 3315 | #ifdef CONFIG_HARDWALL |
d962c144 | 3316 | ONE("hardwall", S_IRUGO, proc_pid_hardwall), |
f133ecca | 3317 | #endif |
22d917d8 EB |
3318 | #ifdef CONFIG_USER_NS |
3319 | REG("uid_map", S_IRUGO|S_IWUSR, proc_uid_map_operations), | |
3320 | REG("gid_map", S_IRUGO|S_IWUSR, proc_gid_map_operations), | |
f76d207a | 3321 | REG("projid_map", S_IRUGO|S_IWUSR, proc_projid_map_operations), |
9cc46516 | 3322 | REG("setgroups", S_IRUGO|S_IWUSR, proc_setgroups_operations), |
22d917d8 | 3323 | #endif |
28a6d671 EB |
3324 | }; |
3325 | ||
f0c3b509 | 3326 | static int proc_tid_base_readdir(struct file *file, struct dir_context *ctx) |
28a6d671 | 3327 | { |
f0c3b509 AV |
3328 | return proc_pident_readdir(file, ctx, |
3329 | tid_base_stuff, ARRAY_SIZE(tid_base_stuff)); | |
28a6d671 EB |
3330 | } |
3331 | ||
00cd8dd3 AV |
3332 | static struct dentry *proc_tid_base_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags) |
3333 | { | |
7bcd6b0e EB |
3334 | return proc_pident_lookup(dir, dentry, |
3335 | tid_base_stuff, ARRAY_SIZE(tid_base_stuff)); | |
28a6d671 EB |
3336 | } |
3337 | ||
00977a59 | 3338 | static const struct file_operations proc_tid_base_operations = { |
28a6d671 | 3339 | .read = generic_read_dir, |
f50752ea AV |
3340 | .iterate_shared = proc_tid_base_readdir, |
3341 | .llseek = generic_file_llseek, | |
28a6d671 EB |
3342 | }; |
3343 | ||
c5ef1c42 | 3344 | static const struct inode_operations proc_tid_base_inode_operations = { |
28a6d671 EB |
3345 | .lookup = proc_tid_base_lookup, |
3346 | .getattr = pid_getattr, | |
3347 | .setattr = proc_setattr, | |
3348 | }; | |
3349 | ||
c52a47ac | 3350 | static int proc_task_instantiate(struct inode *dir, |
c5141e6d | 3351 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
444ceed8 | 3352 | { |
444ceed8 | 3353 | struct inode *inode; |
61a28784 | 3354 | inode = proc_pid_make_inode(dir->i_sb, task); |
444ceed8 EB |
3355 | |
3356 | if (!inode) | |
3357 | goto out; | |
3358 | inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO; | |
3359 | inode->i_op = &proc_tid_base_inode_operations; | |
3360 | inode->i_fop = &proc_tid_base_operations; | |
3361 | inode->i_flags|=S_IMMUTABLE; | |
aed54175 | 3362 | |
bfe86848 MS |
3363 | set_nlink(inode, 2 + pid_entry_count_dirs(tid_base_stuff, |
3364 | ARRAY_SIZE(tid_base_stuff))); | |
444ceed8 | 3365 | |
fb045adb | 3366 | d_set_d_op(dentry, &pid_dentry_operations); |
444ceed8 EB |
3367 | |
3368 | d_add(dentry, inode); | |
3369 | /* Close the race of the process dying before we return the dentry */ | |
0b728e19 | 3370 | if (pid_revalidate(dentry, 0)) |
c52a47ac | 3371 | return 0; |
444ceed8 | 3372 | out: |
c52a47ac | 3373 | return -ENOENT; |
444ceed8 EB |
3374 | } |
3375 | ||
00cd8dd3 | 3376 | static struct dentry *proc_task_lookup(struct inode *dir, struct dentry * dentry, unsigned int flags) |
28a6d671 | 3377 | { |
c52a47ac | 3378 | int result = -ENOENT; |
28a6d671 EB |
3379 | struct task_struct *task; |
3380 | struct task_struct *leader = get_proc_task(dir); | |
28a6d671 | 3381 | unsigned tid; |
b488893a | 3382 | struct pid_namespace *ns; |
28a6d671 EB |
3383 | |
3384 | if (!leader) | |
3385 | goto out_no_task; | |
3386 | ||
dbcdb504 | 3387 | tid = name_to_int(&dentry->d_name); |
28a6d671 EB |
3388 | if (tid == ~0U) |
3389 | goto out; | |
3390 | ||
b488893a | 3391 | ns = dentry->d_sb->s_fs_info; |
28a6d671 | 3392 | rcu_read_lock(); |
b488893a | 3393 | task = find_task_by_pid_ns(tid, ns); |
28a6d671 EB |
3394 | if (task) |
3395 | get_task_struct(task); | |
3396 | rcu_read_unlock(); | |
3397 | if (!task) | |
3398 | goto out; | |
bac0abd6 | 3399 | if (!same_thread_group(leader, task)) |
28a6d671 EB |
3400 | goto out_drop_task; |
3401 | ||
444ceed8 | 3402 | result = proc_task_instantiate(dir, dentry, task, NULL); |
28a6d671 EB |
3403 | out_drop_task: |
3404 | put_task_struct(task); | |
3405 | out: | |
3406 | put_task_struct(leader); | |
3407 | out_no_task: | |
c52a47ac | 3408 | return ERR_PTR(result); |
28a6d671 EB |
3409 | } |
3410 | ||
0bc58a91 EB |
3411 | /* |
3412 | * Find the first tid of a thread group to return to user space. | |
3413 | * | |
3414 | * Usually this is just the thread group leader, but if the users | |
3415 | * buffer was too small or there was a seek into the middle of the | |
3416 | * directory we have more work todo. | |
3417 | * | |
3418 | * In the case of a short read we start with find_task_by_pid. | |
3419 | * | |
3420 | * In the case of a seek we start with the leader and walk nr | |
3421 | * threads past it. | |
3422 | */ | |
9f6e963f ON |
3423 | static struct task_struct *first_tid(struct pid *pid, int tid, loff_t f_pos, |
3424 | struct pid_namespace *ns) | |
0bc58a91 | 3425 | { |
d855a4b7 | 3426 | struct task_struct *pos, *task; |
9f6e963f ON |
3427 | unsigned long nr = f_pos; |
3428 | ||
3429 | if (nr != f_pos) /* 32bit overflow? */ | |
3430 | return NULL; | |
1da177e4 | 3431 | |
cc288738 | 3432 | rcu_read_lock(); |
d855a4b7 ON |
3433 | task = pid_task(pid, PIDTYPE_PID); |
3434 | if (!task) | |
3435 | goto fail; | |
3436 | ||
3437 | /* Attempt to start with the tid of a thread */ | |
9f6e963f | 3438 | if (tid && nr) { |
b488893a | 3439 | pos = find_task_by_pid_ns(tid, ns); |
d855a4b7 | 3440 | if (pos && same_thread_group(pos, task)) |
a872ff0c | 3441 | goto found; |
0bc58a91 | 3442 | } |
1da177e4 | 3443 | |
0bc58a91 | 3444 | /* If nr exceeds the number of threads there is nothing todo */ |
9f6e963f | 3445 | if (nr >= get_nr_threads(task)) |
c986c14a | 3446 | goto fail; |
1da177e4 | 3447 | |
a872ff0c ON |
3448 | /* If we haven't found our starting place yet start |
3449 | * with the leader and walk nr threads forward. | |
0bc58a91 | 3450 | */ |
d855a4b7 | 3451 | pos = task = task->group_leader; |
c986c14a | 3452 | do { |
9f6e963f | 3453 | if (!nr--) |
c986c14a | 3454 | goto found; |
d855a4b7 | 3455 | } while_each_thread(task, pos); |
c986c14a ON |
3456 | fail: |
3457 | pos = NULL; | |
3458 | goto out; | |
a872ff0c ON |
3459 | found: |
3460 | get_task_struct(pos); | |
3461 | out: | |
cc288738 | 3462 | rcu_read_unlock(); |
0bc58a91 EB |
3463 | return pos; |
3464 | } | |
3465 | ||
3466 | /* | |
3467 | * Find the next thread in the thread list. | |
3468 | * Return NULL if there is an error or no next thread. | |
3469 | * | |
3470 | * The reference to the input task_struct is released. | |
3471 | */ | |
3472 | static struct task_struct *next_tid(struct task_struct *start) | |
3473 | { | |
c1df7fb8 | 3474 | struct task_struct *pos = NULL; |
cc288738 | 3475 | rcu_read_lock(); |
c1df7fb8 | 3476 | if (pid_alive(start)) { |
0bc58a91 | 3477 | pos = next_thread(start); |
c1df7fb8 ON |
3478 | if (thread_group_leader(pos)) |
3479 | pos = NULL; | |
3480 | else | |
3481 | get_task_struct(pos); | |
3482 | } | |
cc288738 | 3483 | rcu_read_unlock(); |
0bc58a91 EB |
3484 | put_task_struct(start); |
3485 | return pos; | |
1da177e4 LT |
3486 | } |
3487 | ||
3488 | /* for the /proc/TGID/task/ directories */ | |
f0c3b509 | 3489 | static int proc_task_readdir(struct file *file, struct dir_context *ctx) |
1da177e4 | 3490 | { |
d855a4b7 ON |
3491 | struct inode *inode = file_inode(file); |
3492 | struct task_struct *task; | |
b488893a | 3493 | struct pid_namespace *ns; |
f0c3b509 | 3494 | int tid; |
1da177e4 | 3495 | |
d855a4b7 | 3496 | if (proc_inode_is_dead(inode)) |
f0c3b509 | 3497 | return -ENOENT; |
1da177e4 | 3498 | |
f0c3b509 | 3499 | if (!dir_emit_dots(file, ctx)) |
d855a4b7 | 3500 | return 0; |
1da177e4 | 3501 | |
0bc58a91 EB |
3502 | /* f_version caches the tgid value that the last readdir call couldn't |
3503 | * return. lseek aka telldir automagically resets f_version to 0. | |
3504 | */ | |
3aa3377f | 3505 | ns = inode->i_sb->s_fs_info; |
f0c3b509 AV |
3506 | tid = (int)file->f_version; |
3507 | file->f_version = 0; | |
d855a4b7 | 3508 | for (task = first_tid(proc_pid(inode), tid, ctx->pos - 2, ns); |
0bc58a91 | 3509 | task; |
f0c3b509 AV |
3510 | task = next_tid(task), ctx->pos++) { |
3511 | char name[PROC_NUMBUF]; | |
3512 | int len; | |
b488893a | 3513 | tid = task_pid_nr_ns(task, ns); |
f0c3b509 AV |
3514 | len = snprintf(name, sizeof(name), "%d", tid); |
3515 | if (!proc_fill_cache(file, ctx, name, len, | |
3516 | proc_task_instantiate, task, NULL)) { | |
0bc58a91 EB |
3517 | /* returning this tgid failed, save it as the first |
3518 | * pid for the next readir call */ | |
f0c3b509 | 3519 | file->f_version = (u64)tid; |
0bc58a91 | 3520 | put_task_struct(task); |
1da177e4 | 3521 | break; |
0bc58a91 | 3522 | } |
1da177e4 | 3523 | } |
d855a4b7 | 3524 | |
f0c3b509 | 3525 | return 0; |
1da177e4 | 3526 | } |
6e66b52b EB |
3527 | |
3528 | static int proc_task_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) | |
3529 | { | |
2b0143b5 | 3530 | struct inode *inode = d_inode(dentry); |
99f89551 | 3531 | struct task_struct *p = get_proc_task(inode); |
6e66b52b EB |
3532 | generic_fillattr(inode, stat); |
3533 | ||
99f89551 | 3534 | if (p) { |
99f89551 | 3535 | stat->nlink += get_nr_threads(p); |
99f89551 | 3536 | put_task_struct(p); |
6e66b52b EB |
3537 | } |
3538 | ||
3539 | return 0; | |
3540 | } | |
28a6d671 | 3541 | |
c5ef1c42 | 3542 | static const struct inode_operations proc_task_inode_operations = { |
28a6d671 EB |
3543 | .lookup = proc_task_lookup, |
3544 | .getattr = proc_task_getattr, | |
3545 | .setattr = proc_setattr, | |
0499680a | 3546 | .permission = proc_pid_permission, |
28a6d671 EB |
3547 | }; |
3548 | ||
00977a59 | 3549 | static const struct file_operations proc_task_operations = { |
28a6d671 | 3550 | .read = generic_read_dir, |
f50752ea AV |
3551 | .iterate_shared = proc_task_readdir, |
3552 | .llseek = generic_file_llseek, | |
28a6d671 | 3553 | }; |