Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * linux/fs/proc/base.c | |
3 | * | |
4 | * Copyright (C) 1991, 1992 Linus Torvalds | |
5 | * | |
6 | * proc base directory handling functions | |
7 | * | |
8 | * 1999, Al Viro. Rewritten. Now it covers the whole per-process part. | |
9 | * Instead of using magical inumbers to determine the kind of object | |
10 | * we allocate and fill in-core inodes upon lookup. They don't even | |
11 | * go into icache. We cache the reference to task_struct upon lookup too. | |
12 | * Eventually it should become a filesystem in its own. We don't use the | |
13 | * rest of procfs anymore. | |
e070ad49 ML |
14 | * |
15 | * | |
16 | * Changelog: | |
17 | * 17-Jan-2005 | |
18 | * Allan Bezerra | |
19 | * Bruna Moreira <bruna.moreira@indt.org.br> | |
20 | * Edjard Mota <edjard.mota@indt.org.br> | |
21 | * Ilias Biris <ilias.biris@indt.org.br> | |
22 | * Mauricio Lin <mauricio.lin@indt.org.br> | |
23 | * | |
24 | * Embedded Linux Lab - 10LE Instituto Nokia de Tecnologia - INdT | |
25 | * | |
26 | * A new process specific entry (smaps) included in /proc. It shows the | |
27 | * size of rss for each memory area. The maps entry lacks information | |
28 | * about physical memory size (rss) for each mapped file, i.e., | |
29 | * rss information for executables and library files. | |
30 | * This additional information is useful for any tools that need to know | |
31 | * about physical memory consumption for a process specific library. | |
32 | * | |
33 | * Changelog: | |
34 | * 21-Feb-2005 | |
35 | * Embedded Linux Lab - 10LE Instituto Nokia de Tecnologia - INdT | |
36 | * Pud inclusion in the page table walking. | |
37 | * | |
38 | * ChangeLog: | |
39 | * 10-Mar-2005 | |
40 | * 10LE Instituto Nokia de Tecnologia - INdT: | |
41 | * A better way to walks through the page table as suggested by Hugh Dickins. | |
42 | * | |
43 | * Simo Piiroinen <simo.piiroinen@nokia.com>: | |
44 | * Smaps information related to shared, private, clean and dirty pages. | |
45 | * | |
46 | * Paul Mundt <paul.mundt@nokia.com>: | |
47 | * Overall revision about smaps. | |
1da177e4 LT |
48 | */ |
49 | ||
50 | #include <asm/uaccess.h> | |
51 | ||
1da177e4 LT |
52 | #include <linux/errno.h> |
53 | #include <linux/time.h> | |
54 | #include <linux/proc_fs.h> | |
55 | #include <linux/stat.h> | |
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 | */ |
272ddc8b | 255 | rv = access_remote_vm(mm, arg_end - 1, &c, 1, 0); |
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); | |
272ddc8b | 273 | nr_read = access_remote_vm(mm, p, page, _count, 0); |
c2c0bb44 AD |
274 | if (nr_read < 0) |
275 | rv = nr_read; | |
276 | if (nr_read <= 0) | |
277 | goto out_free_page; | |
278 | ||
279 | if (copy_to_user(buf, page, nr_read)) { | |
280 | rv = -EFAULT; | |
281 | goto out_free_page; | |
282 | } | |
283 | ||
284 | p += nr_read; | |
285 | len -= nr_read; | |
286 | buf += nr_read; | |
287 | count -= nr_read; | |
288 | rv += nr_read; | |
289 | } | |
290 | } else { | |
291 | /* | |
292 | * Command line (1 string) occupies ARGV and maybe | |
293 | * extends into ENVP. | |
294 | */ | |
295 | if (len1 + len2 <= *pos) | |
296 | goto skip_argv_envp; | |
297 | if (len1 <= *pos) | |
298 | goto skip_argv; | |
299 | ||
300 | p = arg_start + *pos; | |
301 | len = len1 - *pos; | |
302 | while (count > 0 && len > 0) { | |
303 | unsigned int _count, l; | |
304 | int nr_read; | |
305 | bool final; | |
306 | ||
307 | _count = min3(count, len, PAGE_SIZE); | |
272ddc8b | 308 | nr_read = access_remote_vm(mm, p, page, _count, 0); |
c2c0bb44 AD |
309 | if (nr_read < 0) |
310 | rv = nr_read; | |
311 | if (nr_read <= 0) | |
312 | goto out_free_page; | |
313 | ||
314 | /* | |
315 | * Command line can be shorter than whole ARGV | |
316 | * even if last "marker" byte says it is not. | |
317 | */ | |
318 | final = false; | |
319 | l = strnlen(page, nr_read); | |
320 | if (l < nr_read) { | |
321 | nr_read = l; | |
322 | final = true; | |
323 | } | |
324 | ||
325 | if (copy_to_user(buf, page, nr_read)) { | |
326 | rv = -EFAULT; | |
327 | goto out_free_page; | |
328 | } | |
329 | ||
330 | p += nr_read; | |
331 | len -= nr_read; | |
332 | buf += nr_read; | |
333 | count -= nr_read; | |
334 | rv += nr_read; | |
335 | ||
336 | if (final) | |
337 | goto out_free_page; | |
338 | } | |
339 | skip_argv: | |
340 | /* | |
341 | * Command line (1 string) occupies ARGV and | |
342 | * extends into ENVP. | |
343 | */ | |
344 | if (len1 <= *pos) { | |
345 | p = env_start + *pos - len1; | |
346 | len = len1 + len2 - *pos; | |
347 | } else { | |
348 | p = env_start; | |
349 | len = len2; | |
350 | } | |
351 | while (count > 0 && len > 0) { | |
352 | unsigned int _count, l; | |
353 | int nr_read; | |
354 | bool final; | |
355 | ||
356 | _count = min3(count, len, PAGE_SIZE); | |
272ddc8b | 357 | nr_read = access_remote_vm(mm, p, page, _count, 0); |
c2c0bb44 AD |
358 | if (nr_read < 0) |
359 | rv = nr_read; | |
360 | if (nr_read <= 0) | |
361 | goto out_free_page; | |
362 | ||
363 | /* Find EOS. */ | |
364 | final = false; | |
365 | l = strnlen(page, nr_read); | |
366 | if (l < nr_read) { | |
367 | nr_read = l; | |
368 | final = true; | |
369 | } | |
370 | ||
371 | if (copy_to_user(buf, page, nr_read)) { | |
372 | rv = -EFAULT; | |
373 | goto out_free_page; | |
374 | } | |
375 | ||
376 | p += nr_read; | |
377 | len -= nr_read; | |
378 | buf += nr_read; | |
379 | count -= nr_read; | |
380 | rv += nr_read; | |
381 | ||
382 | if (final) | |
383 | goto out_free_page; | |
384 | } | |
385 | skip_argv_envp: | |
386 | ; | |
387 | } | |
388 | ||
389 | out_free_page: | |
390 | free_page((unsigned long)page); | |
391 | out_mmput: | |
392 | mmput(mm); | |
393 | if (rv > 0) | |
394 | *pos += rv; | |
395 | return rv; | |
1da177e4 LT |
396 | } |
397 | ||
c2c0bb44 AD |
398 | static const struct file_operations proc_pid_cmdline_ops = { |
399 | .read = proc_pid_cmdline_read, | |
400 | .llseek = generic_file_llseek, | |
401 | }; | |
402 | ||
1da177e4 LT |
403 | #ifdef CONFIG_KALLSYMS |
404 | /* | |
405 | * Provides a wchan file via kallsyms in a proper one-value-per-file format. | |
406 | * Returns the resolved symbol. If that fails, simply return the address. | |
407 | */ | |
edfcd606 AD |
408 | static int proc_pid_wchan(struct seq_file *m, struct pid_namespace *ns, |
409 | struct pid *pid, struct task_struct *task) | |
1da177e4 | 410 | { |
ffb45122 | 411 | unsigned long wchan; |
9281acea | 412 | char symname[KSYM_NAME_LEN]; |
1da177e4 LT |
413 | |
414 | wchan = get_wchan(task); | |
415 | ||
caaee623 JH |
416 | if (wchan && ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS) |
417 | && !lookup_symbol_name(wchan, symname)) | |
25ce3191 | 418 | seq_printf(m, "%s", symname); |
b2f73922 | 419 | else |
1e92a61c | 420 | seq_putc(m, '0'); |
25ce3191 JP |
421 | |
422 | return 0; | |
1da177e4 LT |
423 | } |
424 | #endif /* CONFIG_KALLSYMS */ | |
425 | ||
a9712bc1 AV |
426 | static int lock_trace(struct task_struct *task) |
427 | { | |
428 | int err = mutex_lock_killable(&task->signal->cred_guard_mutex); | |
429 | if (err) | |
430 | return err; | |
caaee623 | 431 | if (!ptrace_may_access(task, PTRACE_MODE_ATTACH_FSCREDS)) { |
a9712bc1 AV |
432 | mutex_unlock(&task->signal->cred_guard_mutex); |
433 | return -EPERM; | |
434 | } | |
435 | return 0; | |
436 | } | |
437 | ||
438 | static void unlock_trace(struct task_struct *task) | |
439 | { | |
440 | mutex_unlock(&task->signal->cred_guard_mutex); | |
441 | } | |
442 | ||
2ec220e2 KC |
443 | #ifdef CONFIG_STACKTRACE |
444 | ||
445 | #define MAX_STACK_TRACE_DEPTH 64 | |
446 | ||
447 | static int proc_pid_stack(struct seq_file *m, struct pid_namespace *ns, | |
448 | struct pid *pid, struct task_struct *task) | |
449 | { | |
450 | struct stack_trace trace; | |
451 | unsigned long *entries; | |
a9712bc1 | 452 | int err; |
2ec220e2 KC |
453 | int i; |
454 | ||
455 | entries = kmalloc(MAX_STACK_TRACE_DEPTH * sizeof(*entries), GFP_KERNEL); | |
456 | if (!entries) | |
457 | return -ENOMEM; | |
458 | ||
459 | trace.nr_entries = 0; | |
460 | trace.max_entries = MAX_STACK_TRACE_DEPTH; | |
461 | trace.entries = entries; | |
462 | trace.skip = 0; | |
2ec220e2 | 463 | |
a9712bc1 AV |
464 | err = lock_trace(task); |
465 | if (!err) { | |
466 | save_stack_trace_tsk(task, &trace); | |
467 | ||
468 | for (i = 0; i < trace.nr_entries; i++) { | |
8b927d73 | 469 | seq_printf(m, "[<%pK>] %pB\n", |
a9712bc1 AV |
470 | (void *)entries[i], (void *)entries[i]); |
471 | } | |
472 | unlock_trace(task); | |
2ec220e2 KC |
473 | } |
474 | kfree(entries); | |
475 | ||
a9712bc1 | 476 | return err; |
2ec220e2 KC |
477 | } |
478 | #endif | |
479 | ||
5968cece | 480 | #ifdef CONFIG_SCHED_INFO |
1da177e4 LT |
481 | /* |
482 | * Provides /proc/PID/schedstat | |
483 | */ | |
f6e826ca AD |
484 | static int proc_pid_schedstat(struct seq_file *m, struct pid_namespace *ns, |
485 | struct pid *pid, struct task_struct *task) | |
1da177e4 | 486 | { |
5968cece NR |
487 | if (unlikely(!sched_info_on())) |
488 | seq_printf(m, "0 0 0\n"); | |
489 | else | |
490 | seq_printf(m, "%llu %llu %lu\n", | |
25ce3191 JP |
491 | (unsigned long long)task->se.sum_exec_runtime, |
492 | (unsigned long long)task->sched_info.run_delay, | |
493 | task->sched_info.pcount); | |
494 | ||
495 | return 0; | |
1da177e4 LT |
496 | } |
497 | #endif | |
498 | ||
9745512c AV |
499 | #ifdef CONFIG_LATENCYTOP |
500 | static int lstats_show_proc(struct seq_file *m, void *v) | |
501 | { | |
502 | int i; | |
13d77c37 HS |
503 | struct inode *inode = m->private; |
504 | struct task_struct *task = get_proc_task(inode); | |
9745512c | 505 | |
13d77c37 HS |
506 | if (!task) |
507 | return -ESRCH; | |
508 | seq_puts(m, "Latency Top version : v0.1\n"); | |
9745512c | 509 | for (i = 0; i < 32; i++) { |
34e49d4f JP |
510 | struct latency_record *lr = &task->latency_record[i]; |
511 | if (lr->backtrace[0]) { | |
9745512c | 512 | int q; |
34e49d4f JP |
513 | seq_printf(m, "%i %li %li", |
514 | lr->count, lr->time, lr->max); | |
9745512c | 515 | for (q = 0; q < LT_BACKTRACEDEPTH; q++) { |
34e49d4f JP |
516 | unsigned long bt = lr->backtrace[q]; |
517 | if (!bt) | |
9745512c | 518 | break; |
34e49d4f | 519 | if (bt == ULONG_MAX) |
9745512c | 520 | break; |
34e49d4f | 521 | seq_printf(m, " %ps", (void *)bt); |
9745512c | 522 | } |
9d6de12f | 523 | seq_putc(m, '\n'); |
9745512c AV |
524 | } |
525 | ||
526 | } | |
13d77c37 | 527 | put_task_struct(task); |
9745512c AV |
528 | return 0; |
529 | } | |
530 | ||
531 | static int lstats_open(struct inode *inode, struct file *file) | |
532 | { | |
13d77c37 | 533 | return single_open(file, lstats_show_proc, inode); |
d6643d12 HS |
534 | } |
535 | ||
9745512c AV |
536 | static ssize_t lstats_write(struct file *file, const char __user *buf, |
537 | size_t count, loff_t *offs) | |
538 | { | |
496ad9aa | 539 | struct task_struct *task = get_proc_task(file_inode(file)); |
9745512c | 540 | |
13d77c37 HS |
541 | if (!task) |
542 | return -ESRCH; | |
9745512c | 543 | clear_all_latency_tracing(task); |
13d77c37 | 544 | put_task_struct(task); |
9745512c AV |
545 | |
546 | return count; | |
547 | } | |
548 | ||
549 | static const struct file_operations proc_lstats_operations = { | |
550 | .open = lstats_open, | |
551 | .read = seq_read, | |
552 | .write = lstats_write, | |
553 | .llseek = seq_lseek, | |
13d77c37 | 554 | .release = single_release, |
9745512c AV |
555 | }; |
556 | ||
557 | #endif | |
558 | ||
6ba51e37 AD |
559 | static int proc_oom_score(struct seq_file *m, struct pid_namespace *ns, |
560 | struct pid *pid, struct task_struct *task) | |
1da177e4 | 561 | { |
a7f638f9 | 562 | unsigned long totalpages = totalram_pages + total_swap_pages; |
b95c35e7 | 563 | unsigned long points = 0; |
1da177e4 | 564 | |
ef419398 ON |
565 | points = oom_badness(task, NULL, NULL, totalpages) * |
566 | 1000 / totalpages; | |
25ce3191 JP |
567 | seq_printf(m, "%lu\n", points); |
568 | ||
569 | return 0; | |
1da177e4 LT |
570 | } |
571 | ||
d85f50d5 | 572 | struct limit_names { |
cedbccab AD |
573 | const char *name; |
574 | const char *unit; | |
d85f50d5 NH |
575 | }; |
576 | ||
577 | static const struct limit_names lnames[RLIM_NLIMITS] = { | |
cff4edb5 | 578 | [RLIMIT_CPU] = {"Max cpu time", "seconds"}, |
d85f50d5 NH |
579 | [RLIMIT_FSIZE] = {"Max file size", "bytes"}, |
580 | [RLIMIT_DATA] = {"Max data size", "bytes"}, | |
581 | [RLIMIT_STACK] = {"Max stack size", "bytes"}, | |
582 | [RLIMIT_CORE] = {"Max core file size", "bytes"}, | |
583 | [RLIMIT_RSS] = {"Max resident set", "bytes"}, | |
584 | [RLIMIT_NPROC] = {"Max processes", "processes"}, | |
585 | [RLIMIT_NOFILE] = {"Max open files", "files"}, | |
586 | [RLIMIT_MEMLOCK] = {"Max locked memory", "bytes"}, | |
587 | [RLIMIT_AS] = {"Max address space", "bytes"}, | |
588 | [RLIMIT_LOCKS] = {"Max file locks", "locks"}, | |
589 | [RLIMIT_SIGPENDING] = {"Max pending signals", "signals"}, | |
590 | [RLIMIT_MSGQUEUE] = {"Max msgqueue size", "bytes"}, | |
591 | [RLIMIT_NICE] = {"Max nice priority", NULL}, | |
592 | [RLIMIT_RTPRIO] = {"Max realtime priority", NULL}, | |
8808117c | 593 | [RLIMIT_RTTIME] = {"Max realtime timeout", "us"}, |
d85f50d5 NH |
594 | }; |
595 | ||
596 | /* Display limits for a process */ | |
1c963eb1 AD |
597 | static int proc_pid_limits(struct seq_file *m, struct pid_namespace *ns, |
598 | struct pid *pid, struct task_struct *task) | |
d85f50d5 NH |
599 | { |
600 | unsigned int i; | |
d85f50d5 | 601 | unsigned long flags; |
d85f50d5 NH |
602 | |
603 | struct rlimit rlim[RLIM_NLIMITS]; | |
604 | ||
a6bebbc8 | 605 | if (!lock_task_sighand(task, &flags)) |
d85f50d5 | 606 | return 0; |
d85f50d5 NH |
607 | memcpy(rlim, task->signal->rlim, sizeof(struct rlimit) * RLIM_NLIMITS); |
608 | unlock_task_sighand(task, &flags); | |
d85f50d5 NH |
609 | |
610 | /* | |
611 | * print the file header | |
612 | */ | |
1c963eb1 | 613 | seq_printf(m, "%-25s %-20s %-20s %-10s\n", |
25ce3191 | 614 | "Limit", "Soft Limit", "Hard Limit", "Units"); |
d85f50d5 NH |
615 | |
616 | for (i = 0; i < RLIM_NLIMITS; i++) { | |
617 | if (rlim[i].rlim_cur == RLIM_INFINITY) | |
1c963eb1 | 618 | seq_printf(m, "%-25s %-20s ", |
25ce3191 | 619 | lnames[i].name, "unlimited"); |
d85f50d5 | 620 | else |
1c963eb1 | 621 | seq_printf(m, "%-25s %-20lu ", |
25ce3191 | 622 | lnames[i].name, rlim[i].rlim_cur); |
d85f50d5 NH |
623 | |
624 | if (rlim[i].rlim_max == RLIM_INFINITY) | |
1c963eb1 | 625 | seq_printf(m, "%-20s ", "unlimited"); |
d85f50d5 | 626 | else |
1c963eb1 | 627 | seq_printf(m, "%-20lu ", rlim[i].rlim_max); |
d85f50d5 NH |
628 | |
629 | if (lnames[i].unit) | |
1c963eb1 | 630 | seq_printf(m, "%-10s\n", lnames[i].unit); |
d85f50d5 | 631 | else |
1c963eb1 | 632 | seq_putc(m, '\n'); |
d85f50d5 NH |
633 | } |
634 | ||
1c963eb1 | 635 | return 0; |
d85f50d5 NH |
636 | } |
637 | ||
ebcb6734 | 638 | #ifdef CONFIG_HAVE_ARCH_TRACEHOOK |
09d93bd6 AD |
639 | static int proc_pid_syscall(struct seq_file *m, struct pid_namespace *ns, |
640 | struct pid *pid, struct task_struct *task) | |
ebcb6734 RM |
641 | { |
642 | long nr; | |
643 | unsigned long args[6], sp, pc; | |
25ce3191 JP |
644 | int res; |
645 | ||
646 | res = lock_trace(task); | |
a9712bc1 AV |
647 | if (res) |
648 | return res; | |
ebcb6734 RM |
649 | |
650 | if (task_current_syscall(task, &nr, args, 6, &sp, &pc)) | |
09d93bd6 | 651 | seq_puts(m, "running\n"); |
a9712bc1 | 652 | else if (nr < 0) |
09d93bd6 | 653 | seq_printf(m, "%ld 0x%lx 0x%lx\n", nr, sp, pc); |
a9712bc1 | 654 | else |
09d93bd6 | 655 | seq_printf(m, |
ebcb6734 RM |
656 | "%ld 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx\n", |
657 | nr, | |
658 | args[0], args[1], args[2], args[3], args[4], args[5], | |
659 | sp, pc); | |
a9712bc1 | 660 | unlock_trace(task); |
25ce3191 JP |
661 | |
662 | return 0; | |
ebcb6734 RM |
663 | } |
664 | #endif /* CONFIG_HAVE_ARCH_TRACEHOOK */ | |
665 | ||
1da177e4 LT |
666 | /************************************************************************/ |
667 | /* Here the fs part begins */ | |
668 | /************************************************************************/ | |
669 | ||
670 | /* permission checks */ | |
778c1144 | 671 | static int proc_fd_access_allowed(struct inode *inode) |
1da177e4 | 672 | { |
778c1144 EB |
673 | struct task_struct *task; |
674 | int allowed = 0; | |
df26c40e EB |
675 | /* Allow access to a task's file descriptors if it is us or we |
676 | * may use ptrace attach to the process and find out that | |
677 | * information. | |
778c1144 EB |
678 | */ |
679 | task = get_proc_task(inode); | |
df26c40e | 680 | if (task) { |
caaee623 | 681 | allowed = ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS); |
778c1144 | 682 | put_task_struct(task); |
df26c40e | 683 | } |
778c1144 | 684 | return allowed; |
1da177e4 LT |
685 | } |
686 | ||
6b4e306a | 687 | int proc_setattr(struct dentry *dentry, struct iattr *attr) |
6d76fa58 LT |
688 | { |
689 | int error; | |
2b0143b5 | 690 | struct inode *inode = d_inode(dentry); |
6d76fa58 LT |
691 | |
692 | if (attr->ia_valid & ATTR_MODE) | |
693 | return -EPERM; | |
694 | ||
31051c85 | 695 | error = setattr_prepare(dentry, attr); |
1025774c CH |
696 | if (error) |
697 | return error; | |
698 | ||
1025774c CH |
699 | setattr_copy(inode, attr); |
700 | mark_inode_dirty(inode); | |
701 | return 0; | |
6d76fa58 LT |
702 | } |
703 | ||
0499680a VK |
704 | /* |
705 | * May current process learn task's sched/cmdline info (for hide_pid_min=1) | |
706 | * or euid/egid (for hide_pid_min=2)? | |
707 | */ | |
708 | static bool has_pid_permissions(struct pid_namespace *pid, | |
709 | struct task_struct *task, | |
710 | int hide_pid_min) | |
711 | { | |
712 | if (pid->hide_pid < hide_pid_min) | |
713 | return true; | |
714 | if (in_group_p(pid->pid_gid)) | |
715 | return true; | |
caaee623 | 716 | return ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS); |
0499680a VK |
717 | } |
718 | ||
719 | ||
720 | static int proc_pid_permission(struct inode *inode, int mask) | |
721 | { | |
722 | struct pid_namespace *pid = inode->i_sb->s_fs_info; | |
723 | struct task_struct *task; | |
724 | bool has_perms; | |
725 | ||
726 | task = get_proc_task(inode); | |
a2ef990a XF |
727 | if (!task) |
728 | return -ESRCH; | |
0499680a VK |
729 | has_perms = has_pid_permissions(pid, task, 1); |
730 | put_task_struct(task); | |
731 | ||
732 | if (!has_perms) { | |
733 | if (pid->hide_pid == 2) { | |
734 | /* | |
735 | * Let's make getdents(), stat(), and open() | |
736 | * consistent with each other. If a process | |
737 | * may not stat() a file, it shouldn't be seen | |
738 | * in procfs at all. | |
739 | */ | |
740 | return -ENOENT; | |
741 | } | |
742 | ||
743 | return -EPERM; | |
744 | } | |
745 | return generic_permission(inode, mask); | |
746 | } | |
747 | ||
748 | ||
749 | ||
c5ef1c42 | 750 | static const struct inode_operations proc_def_inode_operations = { |
6d76fa58 LT |
751 | .setattr = proc_setattr, |
752 | }; | |
753 | ||
be614086 EB |
754 | static int proc_single_show(struct seq_file *m, void *v) |
755 | { | |
756 | struct inode *inode = m->private; | |
757 | struct pid_namespace *ns; | |
758 | struct pid *pid; | |
759 | struct task_struct *task; | |
760 | int ret; | |
761 | ||
762 | ns = inode->i_sb->s_fs_info; | |
763 | pid = proc_pid(inode); | |
764 | task = get_pid_task(pid, PIDTYPE_PID); | |
765 | if (!task) | |
766 | return -ESRCH; | |
767 | ||
768 | ret = PROC_I(inode)->op.proc_show(m, ns, pid, task); | |
769 | ||
770 | put_task_struct(task); | |
771 | return ret; | |
772 | } | |
773 | ||
774 | static int proc_single_open(struct inode *inode, struct file *filp) | |
775 | { | |
c6a34058 | 776 | return single_open(filp, proc_single_show, inode); |
be614086 EB |
777 | } |
778 | ||
779 | static const struct file_operations proc_single_file_operations = { | |
780 | .open = proc_single_open, | |
781 | .read = seq_read, | |
782 | .llseek = seq_lseek, | |
783 | .release = single_release, | |
784 | }; | |
785 | ||
5381e169 ON |
786 | |
787 | struct mm_struct *proc_mem_open(struct inode *inode, unsigned int mode) | |
1da177e4 | 788 | { |
5381e169 ON |
789 | struct task_struct *task = get_proc_task(inode); |
790 | struct mm_struct *mm = ERR_PTR(-ESRCH); | |
e268337d | 791 | |
5381e169 | 792 | if (task) { |
caaee623 | 793 | mm = mm_access(task, mode | PTRACE_MODE_FSCREDS); |
5381e169 | 794 | put_task_struct(task); |
e268337d | 795 | |
5381e169 ON |
796 | if (!IS_ERR_OR_NULL(mm)) { |
797 | /* ensure this mm_struct can't be freed */ | |
798 | atomic_inc(&mm->mm_count); | |
799 | /* but do not pin its memory */ | |
800 | mmput(mm); | |
801 | } | |
802 | } | |
803 | ||
804 | return mm; | |
805 | } | |
806 | ||
807 | static int __mem_open(struct inode *inode, struct file *file, unsigned int mode) | |
808 | { | |
809 | struct mm_struct *mm = proc_mem_open(inode, mode); | |
e268337d LT |
810 | |
811 | if (IS_ERR(mm)) | |
812 | return PTR_ERR(mm); | |
813 | ||
e268337d | 814 | file->private_data = mm; |
1da177e4 LT |
815 | return 0; |
816 | } | |
817 | ||
b409e578 CW |
818 | static int mem_open(struct inode *inode, struct file *file) |
819 | { | |
bc452b4b DH |
820 | int ret = __mem_open(inode, file, PTRACE_MODE_ATTACH); |
821 | ||
822 | /* OK to pass negative loff_t, we can catch out-of-range */ | |
823 | file->f_mode |= FMODE_UNSIGNED_OFFSET; | |
824 | ||
825 | return ret; | |
b409e578 CW |
826 | } |
827 | ||
572d34b9 ON |
828 | static ssize_t mem_rw(struct file *file, char __user *buf, |
829 | size_t count, loff_t *ppos, int write) | |
1da177e4 | 830 | { |
e268337d | 831 | struct mm_struct *mm = file->private_data; |
572d34b9 ON |
832 | unsigned long addr = *ppos; |
833 | ssize_t copied; | |
1da177e4 | 834 | char *page; |
272ddc8b | 835 | unsigned int flags; |
1da177e4 | 836 | |
e268337d LT |
837 | if (!mm) |
838 | return 0; | |
99f89551 | 839 | |
30cd8903 KM |
840 | page = (char *)__get_free_page(GFP_TEMPORARY); |
841 | if (!page) | |
e268337d | 842 | return -ENOMEM; |
1da177e4 | 843 | |
f7ca54f4 | 844 | copied = 0; |
6d08f2c7 ON |
845 | if (!atomic_inc_not_zero(&mm->mm_users)) |
846 | goto free; | |
847 | ||
272ddc8b LT |
848 | /* Maybe we should limit FOLL_FORCE to actual ptrace users? */ |
849 | flags = FOLL_FORCE; | |
6347e8d5 LS |
850 | if (write) |
851 | flags |= FOLL_WRITE; | |
852 | ||
1da177e4 | 853 | while (count > 0) { |
572d34b9 | 854 | int this_len = min_t(int, count, PAGE_SIZE); |
1da177e4 | 855 | |
572d34b9 | 856 | if (write && copy_from_user(page, buf, this_len)) { |
1da177e4 LT |
857 | copied = -EFAULT; |
858 | break; | |
859 | } | |
572d34b9 | 860 | |
6347e8d5 | 861 | this_len = access_remote_vm(mm, addr, page, this_len, flags); |
572d34b9 | 862 | if (!this_len) { |
1da177e4 LT |
863 | if (!copied) |
864 | copied = -EIO; | |
865 | break; | |
866 | } | |
572d34b9 ON |
867 | |
868 | if (!write && copy_to_user(buf, page, this_len)) { | |
869 | copied = -EFAULT; | |
870 | break; | |
871 | } | |
872 | ||
873 | buf += this_len; | |
874 | addr += this_len; | |
875 | copied += this_len; | |
876 | count -= this_len; | |
1da177e4 | 877 | } |
572d34b9 | 878 | *ppos = addr; |
30cd8903 | 879 | |
6d08f2c7 ON |
880 | mmput(mm); |
881 | free: | |
30cd8903 | 882 | free_page((unsigned long) page); |
1da177e4 LT |
883 | return copied; |
884 | } | |
1da177e4 | 885 | |
572d34b9 ON |
886 | static ssize_t mem_read(struct file *file, char __user *buf, |
887 | size_t count, loff_t *ppos) | |
888 | { | |
889 | return mem_rw(file, buf, count, ppos, 0); | |
890 | } | |
891 | ||
892 | static ssize_t mem_write(struct file *file, const char __user *buf, | |
893 | size_t count, loff_t *ppos) | |
894 | { | |
895 | return mem_rw(file, (char __user*)buf, count, ppos, 1); | |
896 | } | |
897 | ||
85863e47 | 898 | loff_t mem_lseek(struct file *file, loff_t offset, int orig) |
1da177e4 LT |
899 | { |
900 | switch (orig) { | |
901 | case 0: | |
902 | file->f_pos = offset; | |
903 | break; | |
904 | case 1: | |
905 | file->f_pos += offset; | |
906 | break; | |
907 | default: | |
908 | return -EINVAL; | |
909 | } | |
910 | force_successful_syscall_return(); | |
911 | return file->f_pos; | |
912 | } | |
913 | ||
e268337d LT |
914 | static int mem_release(struct inode *inode, struct file *file) |
915 | { | |
916 | struct mm_struct *mm = file->private_data; | |
71879d3c | 917 | if (mm) |
6d08f2c7 | 918 | mmdrop(mm); |
e268337d LT |
919 | return 0; |
920 | } | |
921 | ||
00977a59 | 922 | static const struct file_operations proc_mem_operations = { |
1da177e4 LT |
923 | .llseek = mem_lseek, |
924 | .read = mem_read, | |
925 | .write = mem_write, | |
926 | .open = mem_open, | |
e268337d | 927 | .release = mem_release, |
1da177e4 LT |
928 | }; |
929 | ||
b409e578 CW |
930 | static int environ_open(struct inode *inode, struct file *file) |
931 | { | |
932 | return __mem_open(inode, file, PTRACE_MODE_READ); | |
933 | } | |
934 | ||
315e28c8 JP |
935 | static ssize_t environ_read(struct file *file, char __user *buf, |
936 | size_t count, loff_t *ppos) | |
937 | { | |
315e28c8 JP |
938 | char *page; |
939 | unsigned long src = *ppos; | |
b409e578 CW |
940 | int ret = 0; |
941 | struct mm_struct *mm = file->private_data; | |
a3b609ef | 942 | unsigned long env_start, env_end; |
315e28c8 | 943 | |
8148a73c MK |
944 | /* Ensure the process spawned far enough to have an environment. */ |
945 | if (!mm || !mm->env_end) | |
b409e578 | 946 | return 0; |
315e28c8 | 947 | |
315e28c8 JP |
948 | page = (char *)__get_free_page(GFP_TEMPORARY); |
949 | if (!page) | |
b409e578 | 950 | return -ENOMEM; |
315e28c8 | 951 | |
d6f64b89 | 952 | ret = 0; |
b409e578 CW |
953 | if (!atomic_inc_not_zero(&mm->mm_users)) |
954 | goto free; | |
a3b609ef MG |
955 | |
956 | down_read(&mm->mmap_sem); | |
957 | env_start = mm->env_start; | |
958 | env_end = mm->env_end; | |
959 | up_read(&mm->mmap_sem); | |
960 | ||
315e28c8 | 961 | while (count > 0) { |
e8905ec2 DH |
962 | size_t this_len, max_len; |
963 | int retval; | |
315e28c8 | 964 | |
a3b609ef | 965 | if (src >= (env_end - env_start)) |
315e28c8 JP |
966 | break; |
967 | ||
a3b609ef | 968 | this_len = env_end - (env_start + src); |
e8905ec2 DH |
969 | |
970 | max_len = min_t(size_t, PAGE_SIZE, count); | |
971 | this_len = min(max_len, this_len); | |
315e28c8 | 972 | |
272ddc8b | 973 | retval = access_remote_vm(mm, (env_start + src), page, this_len, 0); |
315e28c8 JP |
974 | |
975 | if (retval <= 0) { | |
976 | ret = retval; | |
977 | break; | |
978 | } | |
979 | ||
980 | if (copy_to_user(buf, page, retval)) { | |
981 | ret = -EFAULT; | |
982 | break; | |
983 | } | |
984 | ||
985 | ret += retval; | |
986 | src += retval; | |
987 | buf += retval; | |
988 | count -= retval; | |
989 | } | |
990 | *ppos = src; | |
315e28c8 | 991 | mmput(mm); |
b409e578 CW |
992 | |
993 | free: | |
315e28c8 | 994 | free_page((unsigned long) page); |
315e28c8 JP |
995 | return ret; |
996 | } | |
997 | ||
998 | static const struct file_operations proc_environ_operations = { | |
b409e578 | 999 | .open = environ_open, |
315e28c8 | 1000 | .read = environ_read, |
87df8424 | 1001 | .llseek = generic_file_llseek, |
b409e578 | 1002 | .release = mem_release, |
315e28c8 JP |
1003 | }; |
1004 | ||
c5317167 AV |
1005 | static int auxv_open(struct inode *inode, struct file *file) |
1006 | { | |
1007 | return __mem_open(inode, file, PTRACE_MODE_READ_FSCREDS); | |
1008 | } | |
1009 | ||
1010 | static ssize_t auxv_read(struct file *file, char __user *buf, | |
1011 | size_t count, loff_t *ppos) | |
1012 | { | |
1013 | struct mm_struct *mm = file->private_data; | |
1014 | unsigned int nwords = 0; | |
1015 | do { | |
1016 | nwords += 2; | |
1017 | } while (mm->saved_auxv[nwords - 2] != 0); /* AT_NULL */ | |
1018 | return simple_read_from_buffer(buf, count, ppos, mm->saved_auxv, | |
1019 | nwords * sizeof(mm->saved_auxv[0])); | |
1020 | } | |
1021 | ||
1022 | static const struct file_operations proc_auxv_operations = { | |
1023 | .open = auxv_open, | |
1024 | .read = auxv_read, | |
1025 | .llseek = generic_file_llseek, | |
1026 | .release = mem_release, | |
1027 | }; | |
1028 | ||
fa0cbbf1 DR |
1029 | static ssize_t oom_adj_read(struct file *file, char __user *buf, size_t count, |
1030 | loff_t *ppos) | |
1031 | { | |
496ad9aa | 1032 | struct task_struct *task = get_proc_task(file_inode(file)); |
fa0cbbf1 DR |
1033 | char buffer[PROC_NUMBUF]; |
1034 | int oom_adj = OOM_ADJUST_MIN; | |
1035 | size_t len; | |
fa0cbbf1 DR |
1036 | |
1037 | if (!task) | |
1038 | return -ESRCH; | |
f913da59 MH |
1039 | if (task->signal->oom_score_adj == OOM_SCORE_ADJ_MAX) |
1040 | oom_adj = OOM_ADJUST_MAX; | |
1041 | else | |
1042 | oom_adj = (task->signal->oom_score_adj * -OOM_DISABLE) / | |
1043 | OOM_SCORE_ADJ_MAX; | |
fa0cbbf1 DR |
1044 | put_task_struct(task); |
1045 | len = snprintf(buffer, sizeof(buffer), "%d\n", oom_adj); | |
1046 | return simple_read_from_buffer(buf, count, ppos, buffer, len); | |
1047 | } | |
1048 | ||
1d5f0acb MH |
1049 | static int __set_oom_adj(struct file *file, int oom_adj, bool legacy) |
1050 | { | |
1051 | static DEFINE_MUTEX(oom_adj_mutex); | |
44a70ade | 1052 | struct mm_struct *mm = NULL; |
1d5f0acb MH |
1053 | struct task_struct *task; |
1054 | int err = 0; | |
1055 | ||
1056 | task = get_proc_task(file_inode(file)); | |
1057 | if (!task) | |
1058 | return -ESRCH; | |
1059 | ||
1060 | mutex_lock(&oom_adj_mutex); | |
1061 | if (legacy) { | |
1062 | if (oom_adj < task->signal->oom_score_adj && | |
1063 | !capable(CAP_SYS_RESOURCE)) { | |
1064 | err = -EACCES; | |
1065 | goto err_unlock; | |
1066 | } | |
1067 | /* | |
1068 | * /proc/pid/oom_adj is provided for legacy purposes, ask users to use | |
1069 | * /proc/pid/oom_score_adj instead. | |
1070 | */ | |
1071 | pr_warn_once("%s (%d): /proc/%d/oom_adj is deprecated, please use /proc/%d/oom_score_adj instead.\n", | |
1072 | current->comm, task_pid_nr(current), task_pid_nr(task), | |
1073 | task_pid_nr(task)); | |
1074 | } else { | |
1075 | if ((short)oom_adj < task->signal->oom_score_adj_min && | |
1076 | !capable(CAP_SYS_RESOURCE)) { | |
1077 | err = -EACCES; | |
1078 | goto err_unlock; | |
1079 | } | |
1080 | } | |
1081 | ||
44a70ade MH |
1082 | /* |
1083 | * Make sure we will check other processes sharing the mm if this is | |
1084 | * not vfrok which wants its own oom_score_adj. | |
1085 | * pin the mm so it doesn't go away and get reused after task_unlock | |
1086 | */ | |
1087 | if (!task->vfork_done) { | |
1088 | struct task_struct *p = find_lock_task_mm(task); | |
1089 | ||
1090 | if (p) { | |
1091 | if (atomic_read(&p->mm->mm_users) > 1) { | |
1092 | mm = p->mm; | |
1093 | atomic_inc(&mm->mm_count); | |
1094 | } | |
1095 | task_unlock(p); | |
1096 | } | |
1097 | } | |
1098 | ||
1d5f0acb MH |
1099 | task->signal->oom_score_adj = oom_adj; |
1100 | if (!legacy && has_capability_noaudit(current, CAP_SYS_RESOURCE)) | |
1101 | task->signal->oom_score_adj_min = (short)oom_adj; | |
1102 | trace_oom_score_adj_update(task); | |
44a70ade MH |
1103 | |
1104 | if (mm) { | |
1105 | struct task_struct *p; | |
1106 | ||
1107 | rcu_read_lock(); | |
1108 | for_each_process(p) { | |
1109 | if (same_thread_group(task, p)) | |
1110 | continue; | |
1111 | ||
1112 | /* do not touch kernel threads or the global init */ | |
1113 | if (p->flags & PF_KTHREAD || is_global_init(p)) | |
1114 | continue; | |
1115 | ||
1116 | task_lock(p); | |
1117 | if (!p->vfork_done && process_shares_mm(p, mm)) { | |
1118 | 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", | |
1119 | task_pid_nr(p), p->comm, | |
1120 | p->signal->oom_score_adj, oom_adj, | |
1121 | task_pid_nr(task), task->comm); | |
1122 | p->signal->oom_score_adj = oom_adj; | |
1123 | if (!legacy && has_capability_noaudit(current, CAP_SYS_RESOURCE)) | |
1124 | p->signal->oom_score_adj_min = (short)oom_adj; | |
1125 | } | |
1126 | task_unlock(p); | |
1127 | } | |
1128 | rcu_read_unlock(); | |
1129 | mmdrop(mm); | |
1130 | } | |
1d5f0acb MH |
1131 | err_unlock: |
1132 | mutex_unlock(&oom_adj_mutex); | |
1133 | put_task_struct(task); | |
1134 | return err; | |
1135 | } | |
f913da59 | 1136 | |
b72bdfa7 DR |
1137 | /* |
1138 | * /proc/pid/oom_adj exists solely for backwards compatibility with previous | |
1139 | * kernels. The effective policy is defined by oom_score_adj, which has a | |
1140 | * different scale: oom_adj grew exponentially and oom_score_adj grows linearly. | |
1141 | * Values written to oom_adj are simply mapped linearly to oom_score_adj. | |
1142 | * Processes that become oom disabled via oom_adj will still be oom disabled | |
1143 | * with this implementation. | |
1144 | * | |
1145 | * oom_adj cannot be removed since existing userspace binaries use it. | |
1146 | */ | |
fa0cbbf1 DR |
1147 | static ssize_t oom_adj_write(struct file *file, const char __user *buf, |
1148 | size_t count, loff_t *ppos) | |
1149 | { | |
fa0cbbf1 DR |
1150 | char buffer[PROC_NUMBUF]; |
1151 | int oom_adj; | |
fa0cbbf1 DR |
1152 | int err; |
1153 | ||
1154 | memset(buffer, 0, sizeof(buffer)); | |
1155 | if (count > sizeof(buffer) - 1) | |
1156 | count = sizeof(buffer) - 1; | |
1157 | if (copy_from_user(buffer, buf, count)) { | |
1158 | err = -EFAULT; | |
1159 | goto out; | |
1160 | } | |
1161 | ||
1162 | err = kstrtoint(strstrip(buffer), 0, &oom_adj); | |
1163 | if (err) | |
1164 | goto out; | |
1165 | if ((oom_adj < OOM_ADJUST_MIN || oom_adj > OOM_ADJUST_MAX) && | |
1166 | oom_adj != OOM_DISABLE) { | |
1167 | err = -EINVAL; | |
1168 | goto out; | |
1169 | } | |
1170 | ||
fa0cbbf1 DR |
1171 | /* |
1172 | * Scale /proc/pid/oom_score_adj appropriately ensuring that a maximum | |
1173 | * value is always attainable. | |
1174 | */ | |
1175 | if (oom_adj == OOM_ADJUST_MAX) | |
1176 | oom_adj = OOM_SCORE_ADJ_MAX; | |
1177 | else | |
1178 | oom_adj = (oom_adj * OOM_SCORE_ADJ_MAX) / -OOM_DISABLE; | |
1179 | ||
1d5f0acb | 1180 | err = __set_oom_adj(file, oom_adj, true); |
fa0cbbf1 DR |
1181 | out: |
1182 | return err < 0 ? err : count; | |
1183 | } | |
1184 | ||
1185 | static const struct file_operations proc_oom_adj_operations = { | |
1186 | .read = oom_adj_read, | |
1187 | .write = oom_adj_write, | |
1188 | .llseek = generic_file_llseek, | |
1189 | }; | |
1190 | ||
a63d83f4 DR |
1191 | static ssize_t oom_score_adj_read(struct file *file, char __user *buf, |
1192 | size_t count, loff_t *ppos) | |
1193 | { | |
496ad9aa | 1194 | struct task_struct *task = get_proc_task(file_inode(file)); |
a63d83f4 | 1195 | char buffer[PROC_NUMBUF]; |
a9c58b90 | 1196 | short oom_score_adj = OOM_SCORE_ADJ_MIN; |
a63d83f4 DR |
1197 | size_t len; |
1198 | ||
1199 | if (!task) | |
1200 | return -ESRCH; | |
f913da59 | 1201 | oom_score_adj = task->signal->oom_score_adj; |
a63d83f4 | 1202 | put_task_struct(task); |
a9c58b90 | 1203 | len = snprintf(buffer, sizeof(buffer), "%hd\n", oom_score_adj); |
a63d83f4 DR |
1204 | return simple_read_from_buffer(buf, count, ppos, buffer, len); |
1205 | } | |
1206 | ||
1207 | static ssize_t oom_score_adj_write(struct file *file, const char __user *buf, | |
1208 | size_t count, loff_t *ppos) | |
1209 | { | |
a63d83f4 | 1210 | char buffer[PROC_NUMBUF]; |
0a8cb8e3 | 1211 | int oom_score_adj; |
a63d83f4 DR |
1212 | int err; |
1213 | ||
1214 | memset(buffer, 0, sizeof(buffer)); | |
1215 | if (count > sizeof(buffer) - 1) | |
1216 | count = sizeof(buffer) - 1; | |
723548bf DR |
1217 | if (copy_from_user(buffer, buf, count)) { |
1218 | err = -EFAULT; | |
1219 | goto out; | |
1220 | } | |
a63d83f4 | 1221 | |
0a8cb8e3 | 1222 | err = kstrtoint(strstrip(buffer), 0, &oom_score_adj); |
a63d83f4 | 1223 | if (err) |
723548bf | 1224 | goto out; |
a63d83f4 | 1225 | if (oom_score_adj < OOM_SCORE_ADJ_MIN || |
723548bf DR |
1226 | oom_score_adj > OOM_SCORE_ADJ_MAX) { |
1227 | err = -EINVAL; | |
1228 | goto out; | |
1229 | } | |
a63d83f4 | 1230 | |
1d5f0acb | 1231 | err = __set_oom_adj(file, oom_score_adj, false); |
723548bf DR |
1232 | out: |
1233 | return err < 0 ? err : count; | |
a63d83f4 DR |
1234 | } |
1235 | ||
1236 | static const struct file_operations proc_oom_score_adj_operations = { | |
1237 | .read = oom_score_adj_read, | |
1238 | .write = oom_score_adj_write, | |
6038f373 | 1239 | .llseek = default_llseek, |
a63d83f4 DR |
1240 | }; |
1241 | ||
1da177e4 LT |
1242 | #ifdef CONFIG_AUDITSYSCALL |
1243 | #define TMPBUFLEN 21 | |
1244 | static ssize_t proc_loginuid_read(struct file * file, char __user * buf, | |
1245 | size_t count, loff_t *ppos) | |
1246 | { | |
496ad9aa | 1247 | struct inode * inode = file_inode(file); |
99f89551 | 1248 | struct task_struct *task = get_proc_task(inode); |
1da177e4 LT |
1249 | ssize_t length; |
1250 | char tmpbuf[TMPBUFLEN]; | |
1251 | ||
99f89551 EB |
1252 | if (!task) |
1253 | return -ESRCH; | |
1da177e4 | 1254 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", |
e1760bd5 EB |
1255 | from_kuid(file->f_cred->user_ns, |
1256 | audit_get_loginuid(task))); | |
99f89551 | 1257 | put_task_struct(task); |
1da177e4 LT |
1258 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); |
1259 | } | |
1260 | ||
1261 | static ssize_t proc_loginuid_write(struct file * file, const char __user * buf, | |
1262 | size_t count, loff_t *ppos) | |
1263 | { | |
496ad9aa | 1264 | struct inode * inode = file_inode(file); |
1da177e4 | 1265 | uid_t loginuid; |
e1760bd5 | 1266 | kuid_t kloginuid; |
774636e1 | 1267 | int rv; |
1da177e4 | 1268 | |
7dc52157 PM |
1269 | rcu_read_lock(); |
1270 | if (current != pid_task(proc_pid(inode), PIDTYPE_PID)) { | |
1271 | rcu_read_unlock(); | |
1da177e4 | 1272 | return -EPERM; |
7dc52157 PM |
1273 | } |
1274 | rcu_read_unlock(); | |
1da177e4 | 1275 | |
1da177e4 LT |
1276 | if (*ppos != 0) { |
1277 | /* No partial writes. */ | |
1278 | return -EINVAL; | |
1279 | } | |
1da177e4 | 1280 | |
774636e1 AD |
1281 | rv = kstrtou32_from_user(buf, count, 10, &loginuid); |
1282 | if (rv < 0) | |
1283 | return rv; | |
81407c84 EP |
1284 | |
1285 | /* is userspace tring to explicitly UNSET the loginuid? */ | |
1286 | if (loginuid == AUDIT_UID_UNSET) { | |
1287 | kloginuid = INVALID_UID; | |
1288 | } else { | |
1289 | kloginuid = make_kuid(file->f_cred->user_ns, loginuid); | |
774636e1 AD |
1290 | if (!uid_valid(kloginuid)) |
1291 | return -EINVAL; | |
e1760bd5 EB |
1292 | } |
1293 | ||
774636e1 AD |
1294 | rv = audit_set_loginuid(kloginuid); |
1295 | if (rv < 0) | |
1296 | return rv; | |
1297 | return count; | |
1da177e4 LT |
1298 | } |
1299 | ||
00977a59 | 1300 | static const struct file_operations proc_loginuid_operations = { |
1da177e4 LT |
1301 | .read = proc_loginuid_read, |
1302 | .write = proc_loginuid_write, | |
87df8424 | 1303 | .llseek = generic_file_llseek, |
1da177e4 | 1304 | }; |
1e0bd755 EP |
1305 | |
1306 | static ssize_t proc_sessionid_read(struct file * file, char __user * buf, | |
1307 | size_t count, loff_t *ppos) | |
1308 | { | |
496ad9aa | 1309 | struct inode * inode = file_inode(file); |
1e0bd755 EP |
1310 | struct task_struct *task = get_proc_task(inode); |
1311 | ssize_t length; | |
1312 | char tmpbuf[TMPBUFLEN]; | |
1313 | ||
1314 | if (!task) | |
1315 | return -ESRCH; | |
1316 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", | |
1317 | audit_get_sessionid(task)); | |
1318 | put_task_struct(task); | |
1319 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
1320 | } | |
1321 | ||
1322 | static const struct file_operations proc_sessionid_operations = { | |
1323 | .read = proc_sessionid_read, | |
87df8424 | 1324 | .llseek = generic_file_llseek, |
1e0bd755 | 1325 | }; |
1da177e4 LT |
1326 | #endif |
1327 | ||
f4f154fd AM |
1328 | #ifdef CONFIG_FAULT_INJECTION |
1329 | static ssize_t proc_fault_inject_read(struct file * file, char __user * buf, | |
1330 | size_t count, loff_t *ppos) | |
1331 | { | |
496ad9aa | 1332 | struct task_struct *task = get_proc_task(file_inode(file)); |
f4f154fd AM |
1333 | char buffer[PROC_NUMBUF]; |
1334 | size_t len; | |
1335 | int make_it_fail; | |
f4f154fd AM |
1336 | |
1337 | if (!task) | |
1338 | return -ESRCH; | |
1339 | make_it_fail = task->make_it_fail; | |
1340 | put_task_struct(task); | |
1341 | ||
1342 | len = snprintf(buffer, sizeof(buffer), "%i\n", make_it_fail); | |
0c28f287 AM |
1343 | |
1344 | return simple_read_from_buffer(buf, count, ppos, buffer, len); | |
f4f154fd AM |
1345 | } |
1346 | ||
1347 | static ssize_t proc_fault_inject_write(struct file * file, | |
1348 | const char __user * buf, size_t count, loff_t *ppos) | |
1349 | { | |
1350 | struct task_struct *task; | |
774636e1 | 1351 | char buffer[PROC_NUMBUF]; |
f4f154fd | 1352 | int make_it_fail; |
774636e1 | 1353 | int rv; |
f4f154fd AM |
1354 | |
1355 | if (!capable(CAP_SYS_RESOURCE)) | |
1356 | return -EPERM; | |
1357 | memset(buffer, 0, sizeof(buffer)); | |
1358 | if (count > sizeof(buffer) - 1) | |
1359 | count = sizeof(buffer) - 1; | |
1360 | if (copy_from_user(buffer, buf, count)) | |
1361 | return -EFAULT; | |
774636e1 AD |
1362 | rv = kstrtoint(strstrip(buffer), 0, &make_it_fail); |
1363 | if (rv < 0) | |
1364 | return rv; | |
16caed31 DJ |
1365 | if (make_it_fail < 0 || make_it_fail > 1) |
1366 | return -EINVAL; | |
1367 | ||
496ad9aa | 1368 | task = get_proc_task(file_inode(file)); |
f4f154fd AM |
1369 | if (!task) |
1370 | return -ESRCH; | |
1371 | task->make_it_fail = make_it_fail; | |
1372 | put_task_struct(task); | |
cba8aafe VL |
1373 | |
1374 | return count; | |
f4f154fd AM |
1375 | } |
1376 | ||
00977a59 | 1377 | static const struct file_operations proc_fault_inject_operations = { |
f4f154fd AM |
1378 | .read = proc_fault_inject_read, |
1379 | .write = proc_fault_inject_write, | |
87df8424 | 1380 | .llseek = generic_file_llseek, |
f4f154fd AM |
1381 | }; |
1382 | #endif | |
1383 | ||
9745512c | 1384 | |
43ae34cb IM |
1385 | #ifdef CONFIG_SCHED_DEBUG |
1386 | /* | |
1387 | * Print out various scheduling related per-task fields: | |
1388 | */ | |
1389 | static int sched_show(struct seq_file *m, void *v) | |
1390 | { | |
1391 | struct inode *inode = m->private; | |
1392 | struct task_struct *p; | |
1393 | ||
43ae34cb IM |
1394 | p = get_proc_task(inode); |
1395 | if (!p) | |
1396 | return -ESRCH; | |
1397 | proc_sched_show_task(p, m); | |
1398 | ||
1399 | put_task_struct(p); | |
1400 | ||
1401 | return 0; | |
1402 | } | |
1403 | ||
1404 | static ssize_t | |
1405 | sched_write(struct file *file, const char __user *buf, | |
1406 | size_t count, loff_t *offset) | |
1407 | { | |
496ad9aa | 1408 | struct inode *inode = file_inode(file); |
43ae34cb IM |
1409 | struct task_struct *p; |
1410 | ||
43ae34cb IM |
1411 | p = get_proc_task(inode); |
1412 | if (!p) | |
1413 | return -ESRCH; | |
1414 | proc_sched_set_task(p); | |
1415 | ||
1416 | put_task_struct(p); | |
1417 | ||
1418 | return count; | |
1419 | } | |
1420 | ||
1421 | static int sched_open(struct inode *inode, struct file *filp) | |
1422 | { | |
c6a34058 | 1423 | return single_open(filp, sched_show, inode); |
43ae34cb IM |
1424 | } |
1425 | ||
1426 | static const struct file_operations proc_pid_sched_operations = { | |
1427 | .open = sched_open, | |
1428 | .read = seq_read, | |
1429 | .write = sched_write, | |
1430 | .llseek = seq_lseek, | |
5ea473a1 | 1431 | .release = single_release, |
43ae34cb IM |
1432 | }; |
1433 | ||
1434 | #endif | |
1435 | ||
5091faa4 MG |
1436 | #ifdef CONFIG_SCHED_AUTOGROUP |
1437 | /* | |
1438 | * Print out autogroup related information: | |
1439 | */ | |
1440 | static int sched_autogroup_show(struct seq_file *m, void *v) | |
1441 | { | |
1442 | struct inode *inode = m->private; | |
1443 | struct task_struct *p; | |
1444 | ||
1445 | p = get_proc_task(inode); | |
1446 | if (!p) | |
1447 | return -ESRCH; | |
1448 | proc_sched_autogroup_show_task(p, m); | |
1449 | ||
1450 | put_task_struct(p); | |
1451 | ||
1452 | return 0; | |
1453 | } | |
1454 | ||
1455 | static ssize_t | |
1456 | sched_autogroup_write(struct file *file, const char __user *buf, | |
1457 | size_t count, loff_t *offset) | |
1458 | { | |
496ad9aa | 1459 | struct inode *inode = file_inode(file); |
5091faa4 MG |
1460 | struct task_struct *p; |
1461 | char buffer[PROC_NUMBUF]; | |
0a8cb8e3 | 1462 | int nice; |
5091faa4 MG |
1463 | int err; |
1464 | ||
1465 | memset(buffer, 0, sizeof(buffer)); | |
1466 | if (count > sizeof(buffer) - 1) | |
1467 | count = sizeof(buffer) - 1; | |
1468 | if (copy_from_user(buffer, buf, count)) | |
1469 | return -EFAULT; | |
1470 | ||
0a8cb8e3 AD |
1471 | err = kstrtoint(strstrip(buffer), 0, &nice); |
1472 | if (err < 0) | |
1473 | return err; | |
5091faa4 MG |
1474 | |
1475 | p = get_proc_task(inode); | |
1476 | if (!p) | |
1477 | return -ESRCH; | |
1478 | ||
2e5b5b3a | 1479 | err = proc_sched_autogroup_set_nice(p, nice); |
5091faa4 MG |
1480 | if (err) |
1481 | count = err; | |
1482 | ||
1483 | put_task_struct(p); | |
1484 | ||
1485 | return count; | |
1486 | } | |
1487 | ||
1488 | static int sched_autogroup_open(struct inode *inode, struct file *filp) | |
1489 | { | |
1490 | int ret; | |
1491 | ||
1492 | ret = single_open(filp, sched_autogroup_show, NULL); | |
1493 | if (!ret) { | |
1494 | struct seq_file *m = filp->private_data; | |
1495 | ||
1496 | m->private = inode; | |
1497 | } | |
1498 | return ret; | |
1499 | } | |
1500 | ||
1501 | static const struct file_operations proc_pid_sched_autogroup_operations = { | |
1502 | .open = sched_autogroup_open, | |
1503 | .read = seq_read, | |
1504 | .write = sched_autogroup_write, | |
1505 | .llseek = seq_lseek, | |
1506 | .release = single_release, | |
1507 | }; | |
1508 | ||
1509 | #endif /* CONFIG_SCHED_AUTOGROUP */ | |
1510 | ||
4614a696 | 1511 | static ssize_t comm_write(struct file *file, const char __user *buf, |
1512 | size_t count, loff_t *offset) | |
1513 | { | |
496ad9aa | 1514 | struct inode *inode = file_inode(file); |
4614a696 | 1515 | struct task_struct *p; |
1516 | char buffer[TASK_COMM_LEN]; | |
830e0fc9 | 1517 | const size_t maxlen = sizeof(buffer) - 1; |
4614a696 | 1518 | |
1519 | memset(buffer, 0, sizeof(buffer)); | |
830e0fc9 | 1520 | if (copy_from_user(buffer, buf, count > maxlen ? maxlen : count)) |
4614a696 | 1521 | return -EFAULT; |
1522 | ||
1523 | p = get_proc_task(inode); | |
1524 | if (!p) | |
1525 | return -ESRCH; | |
1526 | ||
1527 | if (same_thread_group(current, p)) | |
1528 | set_task_comm(p, buffer); | |
1529 | else | |
1530 | count = -EINVAL; | |
1531 | ||
1532 | put_task_struct(p); | |
1533 | ||
1534 | return count; | |
1535 | } | |
1536 | ||
1537 | static int comm_show(struct seq_file *m, void *v) | |
1538 | { | |
1539 | struct inode *inode = m->private; | |
1540 | struct task_struct *p; | |
1541 | ||
1542 | p = get_proc_task(inode); | |
1543 | if (!p) | |
1544 | return -ESRCH; | |
1545 | ||
1546 | task_lock(p); | |
1547 | seq_printf(m, "%s\n", p->comm); | |
1548 | task_unlock(p); | |
1549 | ||
1550 | put_task_struct(p); | |
1551 | ||
1552 | return 0; | |
1553 | } | |
1554 | ||
1555 | static int comm_open(struct inode *inode, struct file *filp) | |
1556 | { | |
c6a34058 | 1557 | return single_open(filp, comm_show, inode); |
4614a696 | 1558 | } |
1559 | ||
1560 | static const struct file_operations proc_pid_set_comm_operations = { | |
1561 | .open = comm_open, | |
1562 | .read = seq_read, | |
1563 | .write = comm_write, | |
1564 | .llseek = seq_lseek, | |
1565 | .release = single_release, | |
1566 | }; | |
1567 | ||
7773fbc5 | 1568 | static int proc_exe_link(struct dentry *dentry, struct path *exe_path) |
925d1c40 MH |
1569 | { |
1570 | struct task_struct *task; | |
925d1c40 MH |
1571 | struct file *exe_file; |
1572 | ||
2b0143b5 | 1573 | task = get_proc_task(d_inode(dentry)); |
925d1c40 MH |
1574 | if (!task) |
1575 | return -ENOENT; | |
cd81a917 | 1576 | exe_file = get_task_exe_file(task); |
925d1c40 | 1577 | put_task_struct(task); |
925d1c40 MH |
1578 | if (exe_file) { |
1579 | *exe_path = exe_file->f_path; | |
1580 | path_get(&exe_file->f_path); | |
1581 | fput(exe_file); | |
1582 | return 0; | |
1583 | } else | |
1584 | return -ENOENT; | |
1585 | } | |
1586 | ||
6b255391 | 1587 | static const char *proc_pid_get_link(struct dentry *dentry, |
fceef393 AV |
1588 | struct inode *inode, |
1589 | struct delayed_call *done) | |
1da177e4 | 1590 | { |
408ef013 | 1591 | struct path path; |
1da177e4 LT |
1592 | int error = -EACCES; |
1593 | ||
6b255391 AV |
1594 | if (!dentry) |
1595 | return ERR_PTR(-ECHILD); | |
1596 | ||
778c1144 EB |
1597 | /* Are we allowed to snoop on the tasks file descriptors? */ |
1598 | if (!proc_fd_access_allowed(inode)) | |
1da177e4 | 1599 | goto out; |
1da177e4 | 1600 | |
408ef013 CH |
1601 | error = PROC_I(inode)->op.proc_get_link(dentry, &path); |
1602 | if (error) | |
1603 | goto out; | |
1604 | ||
6e77137b | 1605 | nd_jump_link(&path); |
408ef013 | 1606 | return NULL; |
1da177e4 | 1607 | out: |
008b150a | 1608 | return ERR_PTR(error); |
1da177e4 LT |
1609 | } |
1610 | ||
3dcd25f3 | 1611 | static int do_proc_readlink(struct path *path, char __user *buffer, int buflen) |
1da177e4 | 1612 | { |
e12ba74d | 1613 | char *tmp = (char*)__get_free_page(GFP_TEMPORARY); |
3dcd25f3 | 1614 | char *pathname; |
1da177e4 LT |
1615 | int len; |
1616 | ||
1617 | if (!tmp) | |
1618 | return -ENOMEM; | |
0c28f287 | 1619 | |
7b2a69ba | 1620 | pathname = d_path(path, tmp, PAGE_SIZE); |
3dcd25f3 JB |
1621 | len = PTR_ERR(pathname); |
1622 | if (IS_ERR(pathname)) | |
1da177e4 | 1623 | goto out; |
3dcd25f3 | 1624 | len = tmp + PAGE_SIZE - 1 - pathname; |
1da177e4 LT |
1625 | |
1626 | if (len > buflen) | |
1627 | len = buflen; | |
3dcd25f3 | 1628 | if (copy_to_user(buffer, pathname, len)) |
1da177e4 LT |
1629 | len = -EFAULT; |
1630 | out: | |
1631 | free_page((unsigned long)tmp); | |
1632 | return len; | |
1633 | } | |
1634 | ||
1635 | static int proc_pid_readlink(struct dentry * dentry, char __user * buffer, int buflen) | |
1636 | { | |
1637 | int error = -EACCES; | |
2b0143b5 | 1638 | struct inode *inode = d_inode(dentry); |
3dcd25f3 | 1639 | struct path path; |
1da177e4 | 1640 | |
778c1144 EB |
1641 | /* Are we allowed to snoop on the tasks file descriptors? */ |
1642 | if (!proc_fd_access_allowed(inode)) | |
1da177e4 | 1643 | goto out; |
1da177e4 | 1644 | |
7773fbc5 | 1645 | error = PROC_I(inode)->op.proc_get_link(dentry, &path); |
1da177e4 LT |
1646 | if (error) |
1647 | goto out; | |
1648 | ||
3dcd25f3 JB |
1649 | error = do_proc_readlink(&path, buffer, buflen); |
1650 | path_put(&path); | |
1da177e4 | 1651 | out: |
1da177e4 LT |
1652 | return error; |
1653 | } | |
1654 | ||
faf60af1 | 1655 | const struct inode_operations proc_pid_link_inode_operations = { |
1da177e4 | 1656 | .readlink = proc_pid_readlink, |
6b255391 | 1657 | .get_link = proc_pid_get_link, |
6d76fa58 | 1658 | .setattr = proc_setattr, |
1da177e4 LT |
1659 | }; |
1660 | ||
28a6d671 EB |
1661 | |
1662 | /* building an inode */ | |
1663 | ||
6b4e306a | 1664 | struct inode *proc_pid_make_inode(struct super_block * sb, struct task_struct *task) |
28a6d671 EB |
1665 | { |
1666 | struct inode * inode; | |
1667 | struct proc_inode *ei; | |
c69e8d9c | 1668 | const struct cred *cred; |
1da177e4 | 1669 | |
28a6d671 | 1670 | /* We need a new inode */ |
1da177e4 | 1671 | |
28a6d671 EB |
1672 | inode = new_inode(sb); |
1673 | if (!inode) | |
1674 | goto out; | |
1675 | ||
1676 | /* Common stuff */ | |
1677 | ei = PROC_I(inode); | |
85fe4025 | 1678 | inode->i_ino = get_next_ino(); |
078cd827 | 1679 | inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode); |
28a6d671 EB |
1680 | inode->i_op = &proc_def_inode_operations; |
1681 | ||
1682 | /* | |
1683 | * grab the reference to task. | |
1684 | */ | |
1a657f78 | 1685 | ei->pid = get_task_pid(task, PIDTYPE_PID); |
28a6d671 EB |
1686 | if (!ei->pid) |
1687 | goto out_unlock; | |
1688 | ||
28a6d671 | 1689 | if (task_dumpable(task)) { |
c69e8d9c DH |
1690 | rcu_read_lock(); |
1691 | cred = __task_cred(task); | |
1692 | inode->i_uid = cred->euid; | |
1693 | inode->i_gid = cred->egid; | |
1694 | rcu_read_unlock(); | |
1da177e4 | 1695 | } |
28a6d671 EB |
1696 | security_task_to_inode(task, inode); |
1697 | ||
1da177e4 | 1698 | out: |
28a6d671 EB |
1699 | return inode; |
1700 | ||
1701 | out_unlock: | |
1702 | iput(inode); | |
1703 | return NULL; | |
1da177e4 LT |
1704 | } |
1705 | ||
6b4e306a | 1706 | int pid_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) |
1da177e4 | 1707 | { |
2b0143b5 | 1708 | struct inode *inode = d_inode(dentry); |
28a6d671 | 1709 | struct task_struct *task; |
c69e8d9c | 1710 | const struct cred *cred; |
0499680a | 1711 | struct pid_namespace *pid = dentry->d_sb->s_fs_info; |
c69e8d9c | 1712 | |
28a6d671 | 1713 | generic_fillattr(inode, stat); |
1da177e4 | 1714 | |
28a6d671 | 1715 | rcu_read_lock(); |
dcb0f222 EB |
1716 | stat->uid = GLOBAL_ROOT_UID; |
1717 | stat->gid = GLOBAL_ROOT_GID; | |
28a6d671 EB |
1718 | task = pid_task(proc_pid(inode), PIDTYPE_PID); |
1719 | if (task) { | |
0499680a VK |
1720 | if (!has_pid_permissions(pid, task, 2)) { |
1721 | rcu_read_unlock(); | |
1722 | /* | |
1723 | * This doesn't prevent learning whether PID exists, | |
1724 | * it only makes getattr() consistent with readdir(). | |
1725 | */ | |
1726 | return -ENOENT; | |
1727 | } | |
28a6d671 EB |
1728 | if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) || |
1729 | task_dumpable(task)) { | |
c69e8d9c DH |
1730 | cred = __task_cred(task); |
1731 | stat->uid = cred->euid; | |
1732 | stat->gid = cred->egid; | |
1da177e4 LT |
1733 | } |
1734 | } | |
28a6d671 | 1735 | rcu_read_unlock(); |
d6e71144 | 1736 | return 0; |
1da177e4 LT |
1737 | } |
1738 | ||
1da177e4 LT |
1739 | /* dentry stuff */ |
1740 | ||
1741 | /* | |
1742 | * Exceptional case: normally we are not allowed to unhash a busy | |
1743 | * directory. In this case, however, we can do it - no aliasing problems | |
1744 | * due to the way we treat inodes. | |
1745 | * | |
1746 | * Rewrite the inode's ownerships here because the owning task may have | |
1747 | * performed a setuid(), etc. | |
99f89551 EB |
1748 | * |
1749 | * Before the /proc/pid/status file was created the only way to read | |
1750 | * the effective uid of a /process was to stat /proc/pid. Reading | |
1751 | * /proc/pid/status is slow enough that procps and other packages | |
1752 | * kept stating /proc/pid. To keep the rules in /proc simple I have | |
1753 | * made this apply to all per process world readable and executable | |
1754 | * directories. | |
1da177e4 | 1755 | */ |
0b728e19 | 1756 | int pid_revalidate(struct dentry *dentry, unsigned int flags) |
1da177e4 | 1757 | { |
34286d66 NP |
1758 | struct inode *inode; |
1759 | struct task_struct *task; | |
c69e8d9c DH |
1760 | const struct cred *cred; |
1761 | ||
0b728e19 | 1762 | if (flags & LOOKUP_RCU) |
34286d66 NP |
1763 | return -ECHILD; |
1764 | ||
2b0143b5 | 1765 | inode = d_inode(dentry); |
34286d66 NP |
1766 | task = get_proc_task(inode); |
1767 | ||
99f89551 EB |
1768 | if (task) { |
1769 | if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) || | |
1770 | task_dumpable(task)) { | |
c69e8d9c DH |
1771 | rcu_read_lock(); |
1772 | cred = __task_cred(task); | |
1773 | inode->i_uid = cred->euid; | |
1774 | inode->i_gid = cred->egid; | |
1775 | rcu_read_unlock(); | |
1da177e4 | 1776 | } else { |
dcb0f222 EB |
1777 | inode->i_uid = GLOBAL_ROOT_UID; |
1778 | inode->i_gid = GLOBAL_ROOT_GID; | |
1da177e4 | 1779 | } |
9ee8ab9f | 1780 | inode->i_mode &= ~(S_ISUID | S_ISGID); |
1da177e4 | 1781 | security_task_to_inode(task, inode); |
99f89551 | 1782 | put_task_struct(task); |
1da177e4 LT |
1783 | return 1; |
1784 | } | |
1da177e4 LT |
1785 | return 0; |
1786 | } | |
1787 | ||
d855a4b7 ON |
1788 | static inline bool proc_inode_is_dead(struct inode *inode) |
1789 | { | |
1790 | return !proc_pid(inode)->tasks[PIDTYPE_PID].first; | |
1791 | } | |
1792 | ||
1dd704b6 DH |
1793 | int pid_delete_dentry(const struct dentry *dentry) |
1794 | { | |
1795 | /* Is the task we represent dead? | |
1796 | * If so, then don't put the dentry on the lru list, | |
1797 | * kill it immediately. | |
1798 | */ | |
2b0143b5 | 1799 | return proc_inode_is_dead(d_inode(dentry)); |
1dd704b6 DH |
1800 | } |
1801 | ||
6b4e306a | 1802 | const struct dentry_operations pid_dentry_operations = |
28a6d671 EB |
1803 | { |
1804 | .d_revalidate = pid_revalidate, | |
1805 | .d_delete = pid_delete_dentry, | |
1806 | }; | |
1807 | ||
1808 | /* Lookups */ | |
1809 | ||
1c0d04c9 EB |
1810 | /* |
1811 | * Fill a directory entry. | |
1812 | * | |
1813 | * If possible create the dcache entry and derive our inode number and | |
1814 | * file type from dcache entry. | |
1815 | * | |
1816 | * Since all of the proc inode numbers are dynamically generated, the inode | |
1817 | * numbers do not exist until the inode is cache. This means creating the | |
1818 | * the dcache entry in readdir is necessary to keep the inode numbers | |
1819 | * reported by readdir in sync with the inode numbers reported | |
1820 | * by stat. | |
1821 | */ | |
f0c3b509 | 1822 | bool proc_fill_cache(struct file *file, struct dir_context *ctx, |
6b4e306a | 1823 | const char *name, int len, |
c5141e6d | 1824 | instantiate_t instantiate, struct task_struct *task, const void *ptr) |
61a28784 | 1825 | { |
f0c3b509 | 1826 | struct dentry *child, *dir = file->f_path.dentry; |
1df98b8b | 1827 | struct qstr qname = QSTR_INIT(name, len); |
61a28784 | 1828 | struct inode *inode; |
1df98b8b AV |
1829 | unsigned type; |
1830 | ino_t ino; | |
61a28784 | 1831 | |
1df98b8b | 1832 | child = d_hash_and_lookup(dir, &qname); |
61a28784 | 1833 | if (!child) { |
3781764b AV |
1834 | DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq); |
1835 | child = d_alloc_parallel(dir, &qname, &wq); | |
1836 | if (IS_ERR(child)) | |
1df98b8b | 1837 | goto end_instantiate; |
3781764b AV |
1838 | if (d_in_lookup(child)) { |
1839 | int err = instantiate(d_inode(dir), child, task, ptr); | |
1840 | d_lookup_done(child); | |
1841 | if (err < 0) { | |
1842 | dput(child); | |
1843 | goto end_instantiate; | |
1844 | } | |
61a28784 EB |
1845 | } |
1846 | } | |
2b0143b5 | 1847 | inode = d_inode(child); |
147ce699 AV |
1848 | ino = inode->i_ino; |
1849 | type = inode->i_mode >> 12; | |
61a28784 | 1850 | dput(child); |
f0c3b509 | 1851 | return dir_emit(ctx, name, len, ino, type); |
1df98b8b AV |
1852 | |
1853 | end_instantiate: | |
1854 | return dir_emit(ctx, name, len, 1, DT_UNKNOWN); | |
61a28784 EB |
1855 | } |
1856 | ||
640708a2 PE |
1857 | /* |
1858 | * dname_to_vma_addr - maps a dentry name into two unsigned longs | |
1859 | * which represent vma start and end addresses. | |
1860 | */ | |
1861 | static int dname_to_vma_addr(struct dentry *dentry, | |
1862 | unsigned long *start, unsigned long *end) | |
1863 | { | |
1864 | if (sscanf(dentry->d_name.name, "%lx-%lx", start, end) != 2) | |
1865 | return -EINVAL; | |
1866 | ||
1867 | return 0; | |
1868 | } | |
1869 | ||
0b728e19 | 1870 | static int map_files_d_revalidate(struct dentry *dentry, unsigned int flags) |
640708a2 PE |
1871 | { |
1872 | unsigned long vm_start, vm_end; | |
1873 | bool exact_vma_exists = false; | |
1874 | struct mm_struct *mm = NULL; | |
1875 | struct task_struct *task; | |
1876 | const struct cred *cred; | |
1877 | struct inode *inode; | |
1878 | int status = 0; | |
1879 | ||
0b728e19 | 1880 | if (flags & LOOKUP_RCU) |
640708a2 PE |
1881 | return -ECHILD; |
1882 | ||
2b0143b5 | 1883 | inode = d_inode(dentry); |
640708a2 PE |
1884 | task = get_proc_task(inode); |
1885 | if (!task) | |
1886 | goto out_notask; | |
1887 | ||
caaee623 | 1888 | mm = mm_access(task, PTRACE_MODE_READ_FSCREDS); |
2344bec7 | 1889 | if (IS_ERR_OR_NULL(mm)) |
640708a2 PE |
1890 | goto out; |
1891 | ||
1892 | if (!dname_to_vma_addr(dentry, &vm_start, &vm_end)) { | |
1893 | down_read(&mm->mmap_sem); | |
1894 | exact_vma_exists = !!find_exact_vma(mm, vm_start, vm_end); | |
1895 | up_read(&mm->mmap_sem); | |
1896 | } | |
1897 | ||
1898 | mmput(mm); | |
1899 | ||
1900 | if (exact_vma_exists) { | |
1901 | if (task_dumpable(task)) { | |
1902 | rcu_read_lock(); | |
1903 | cred = __task_cred(task); | |
1904 | inode->i_uid = cred->euid; | |
1905 | inode->i_gid = cred->egid; | |
1906 | rcu_read_unlock(); | |
1907 | } else { | |
dcb0f222 EB |
1908 | inode->i_uid = GLOBAL_ROOT_UID; |
1909 | inode->i_gid = GLOBAL_ROOT_GID; | |
640708a2 PE |
1910 | } |
1911 | security_task_to_inode(task, inode); | |
1912 | status = 1; | |
1913 | } | |
1914 | ||
1915 | out: | |
1916 | put_task_struct(task); | |
1917 | ||
1918 | out_notask: | |
640708a2 PE |
1919 | return status; |
1920 | } | |
1921 | ||
1922 | static const struct dentry_operations tid_map_files_dentry_operations = { | |
1923 | .d_revalidate = map_files_d_revalidate, | |
1924 | .d_delete = pid_delete_dentry, | |
1925 | }; | |
1926 | ||
6b255391 | 1927 | static int map_files_get_link(struct dentry *dentry, struct path *path) |
640708a2 PE |
1928 | { |
1929 | unsigned long vm_start, vm_end; | |
1930 | struct vm_area_struct *vma; | |
1931 | struct task_struct *task; | |
1932 | struct mm_struct *mm; | |
1933 | int rc; | |
1934 | ||
1935 | rc = -ENOENT; | |
2b0143b5 | 1936 | task = get_proc_task(d_inode(dentry)); |
640708a2 PE |
1937 | if (!task) |
1938 | goto out; | |
1939 | ||
1940 | mm = get_task_mm(task); | |
1941 | put_task_struct(task); | |
1942 | if (!mm) | |
1943 | goto out; | |
1944 | ||
1945 | rc = dname_to_vma_addr(dentry, &vm_start, &vm_end); | |
1946 | if (rc) | |
1947 | goto out_mmput; | |
1948 | ||
70335abb | 1949 | rc = -ENOENT; |
640708a2 PE |
1950 | down_read(&mm->mmap_sem); |
1951 | vma = find_exact_vma(mm, vm_start, vm_end); | |
1952 | if (vma && vma->vm_file) { | |
1953 | *path = vma->vm_file->f_path; | |
1954 | path_get(path); | |
1955 | rc = 0; | |
1956 | } | |
1957 | up_read(&mm->mmap_sem); | |
1958 | ||
1959 | out_mmput: | |
1960 | mmput(mm); | |
1961 | out: | |
1962 | return rc; | |
1963 | } | |
1964 | ||
1965 | struct map_files_info { | |
7b540d06 | 1966 | fmode_t mode; |
640708a2 PE |
1967 | unsigned long len; |
1968 | unsigned char name[4*sizeof(long)+2]; /* max: %lx-%lx\0 */ | |
1969 | }; | |
1970 | ||
bdb4d100 CO |
1971 | /* |
1972 | * Only allow CAP_SYS_ADMIN to follow the links, due to concerns about how the | |
1973 | * symlinks may be used to bypass permissions on ancestor directories in the | |
1974 | * path to the file in question. | |
1975 | */ | |
1976 | static const char * | |
6b255391 | 1977 | proc_map_files_get_link(struct dentry *dentry, |
fceef393 AV |
1978 | struct inode *inode, |
1979 | struct delayed_call *done) | |
bdb4d100 CO |
1980 | { |
1981 | if (!capable(CAP_SYS_ADMIN)) | |
1982 | return ERR_PTR(-EPERM); | |
1983 | ||
fceef393 | 1984 | return proc_pid_get_link(dentry, inode, done); |
bdb4d100 CO |
1985 | } |
1986 | ||
1987 | /* | |
6b255391 | 1988 | * Identical to proc_pid_link_inode_operations except for get_link() |
bdb4d100 CO |
1989 | */ |
1990 | static const struct inode_operations proc_map_files_link_inode_operations = { | |
1991 | .readlink = proc_pid_readlink, | |
6b255391 | 1992 | .get_link = proc_map_files_get_link, |
bdb4d100 CO |
1993 | .setattr = proc_setattr, |
1994 | }; | |
1995 | ||
c52a47ac | 1996 | static int |
640708a2 PE |
1997 | proc_map_files_instantiate(struct inode *dir, struct dentry *dentry, |
1998 | struct task_struct *task, const void *ptr) | |
1999 | { | |
7b540d06 | 2000 | fmode_t mode = (fmode_t)(unsigned long)ptr; |
640708a2 PE |
2001 | struct proc_inode *ei; |
2002 | struct inode *inode; | |
2003 | ||
640708a2 PE |
2004 | inode = proc_pid_make_inode(dir->i_sb, task); |
2005 | if (!inode) | |
c52a47ac | 2006 | return -ENOENT; |
640708a2 PE |
2007 | |
2008 | ei = PROC_I(inode); | |
6b255391 | 2009 | ei->op.proc_get_link = map_files_get_link; |
640708a2 | 2010 | |
bdb4d100 | 2011 | inode->i_op = &proc_map_files_link_inode_operations; |
640708a2 PE |
2012 | inode->i_size = 64; |
2013 | inode->i_mode = S_IFLNK; | |
2014 | ||
7b540d06 | 2015 | if (mode & FMODE_READ) |
640708a2 | 2016 | inode->i_mode |= S_IRUSR; |
7b540d06 | 2017 | if (mode & FMODE_WRITE) |
640708a2 PE |
2018 | inode->i_mode |= S_IWUSR; |
2019 | ||
2020 | d_set_d_op(dentry, &tid_map_files_dentry_operations); | |
2021 | d_add(dentry, inode); | |
2022 | ||
c52a47ac | 2023 | return 0; |
640708a2 PE |
2024 | } |
2025 | ||
2026 | static struct dentry *proc_map_files_lookup(struct inode *dir, | |
00cd8dd3 | 2027 | struct dentry *dentry, unsigned int flags) |
640708a2 PE |
2028 | { |
2029 | unsigned long vm_start, vm_end; | |
2030 | struct vm_area_struct *vma; | |
2031 | struct task_struct *task; | |
c52a47ac | 2032 | int result; |
640708a2 PE |
2033 | struct mm_struct *mm; |
2034 | ||
c52a47ac | 2035 | result = -ENOENT; |
640708a2 PE |
2036 | task = get_proc_task(dir); |
2037 | if (!task) | |
2038 | goto out; | |
2039 | ||
c52a47ac | 2040 | result = -EACCES; |
caaee623 | 2041 | if (!ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS)) |
640708a2 PE |
2042 | goto out_put_task; |
2043 | ||
c52a47ac | 2044 | result = -ENOENT; |
640708a2 | 2045 | if (dname_to_vma_addr(dentry, &vm_start, &vm_end)) |
eb94cd96 | 2046 | goto out_put_task; |
640708a2 PE |
2047 | |
2048 | mm = get_task_mm(task); | |
2049 | if (!mm) | |
eb94cd96 | 2050 | goto out_put_task; |
640708a2 PE |
2051 | |
2052 | down_read(&mm->mmap_sem); | |
2053 | vma = find_exact_vma(mm, vm_start, vm_end); | |
2054 | if (!vma) | |
2055 | goto out_no_vma; | |
2056 | ||
05f56484 SK |
2057 | if (vma->vm_file) |
2058 | result = proc_map_files_instantiate(dir, dentry, task, | |
2059 | (void *)(unsigned long)vma->vm_file->f_mode); | |
640708a2 PE |
2060 | |
2061 | out_no_vma: | |
2062 | up_read(&mm->mmap_sem); | |
2063 | mmput(mm); | |
640708a2 PE |
2064 | out_put_task: |
2065 | put_task_struct(task); | |
2066 | out: | |
c52a47ac | 2067 | return ERR_PTR(result); |
640708a2 PE |
2068 | } |
2069 | ||
2070 | static const struct inode_operations proc_map_files_inode_operations = { | |
2071 | .lookup = proc_map_files_lookup, | |
2072 | .permission = proc_fd_permission, | |
2073 | .setattr = proc_setattr, | |
2074 | }; | |
2075 | ||
2076 | static int | |
f0c3b509 | 2077 | proc_map_files_readdir(struct file *file, struct dir_context *ctx) |
640708a2 | 2078 | { |
640708a2 PE |
2079 | struct vm_area_struct *vma; |
2080 | struct task_struct *task; | |
2081 | struct mm_struct *mm; | |
f0c3b509 AV |
2082 | unsigned long nr_files, pos, i; |
2083 | struct flex_array *fa = NULL; | |
2084 | struct map_files_info info; | |
2085 | struct map_files_info *p; | |
640708a2 PE |
2086 | int ret; |
2087 | ||
640708a2 | 2088 | ret = -ENOENT; |
f0c3b509 | 2089 | task = get_proc_task(file_inode(file)); |
640708a2 PE |
2090 | if (!task) |
2091 | goto out; | |
2092 | ||
2093 | ret = -EACCES; | |
caaee623 | 2094 | if (!ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS)) |
640708a2 PE |
2095 | goto out_put_task; |
2096 | ||
2097 | ret = 0; | |
f0c3b509 AV |
2098 | if (!dir_emit_dots(file, ctx)) |
2099 | goto out_put_task; | |
640708a2 | 2100 | |
f0c3b509 AV |
2101 | mm = get_task_mm(task); |
2102 | if (!mm) | |
2103 | goto out_put_task; | |
2104 | down_read(&mm->mmap_sem); | |
640708a2 | 2105 | |
f0c3b509 | 2106 | nr_files = 0; |
640708a2 | 2107 | |
f0c3b509 AV |
2108 | /* |
2109 | * We need two passes here: | |
2110 | * | |
2111 | * 1) Collect vmas of mapped files with mmap_sem taken | |
2112 | * 2) Release mmap_sem and instantiate entries | |
2113 | * | |
2114 | * otherwise we get lockdep complained, since filldir() | |
2115 | * routine might require mmap_sem taken in might_fault(). | |
2116 | */ | |
640708a2 | 2117 | |
f0c3b509 AV |
2118 | for (vma = mm->mmap, pos = 2; vma; vma = vma->vm_next) { |
2119 | if (vma->vm_file && ++pos > ctx->pos) | |
2120 | nr_files++; | |
2121 | } | |
2122 | ||
2123 | if (nr_files) { | |
2124 | fa = flex_array_alloc(sizeof(info), nr_files, | |
2125 | GFP_KERNEL); | |
2126 | if (!fa || flex_array_prealloc(fa, 0, nr_files, | |
2127 | GFP_KERNEL)) { | |
2128 | ret = -ENOMEM; | |
2129 | if (fa) | |
2130 | flex_array_free(fa); | |
2131 | up_read(&mm->mmap_sem); | |
2132 | mmput(mm); | |
2133 | goto out_put_task; | |
640708a2 | 2134 | } |
f0c3b509 AV |
2135 | for (i = 0, vma = mm->mmap, pos = 2; vma; |
2136 | vma = vma->vm_next) { | |
2137 | if (!vma->vm_file) | |
2138 | continue; | |
2139 | if (++pos <= ctx->pos) | |
2140 | continue; | |
2141 | ||
2142 | info.mode = vma->vm_file->f_mode; | |
2143 | info.len = snprintf(info.name, | |
2144 | sizeof(info.name), "%lx-%lx", | |
2145 | vma->vm_start, vma->vm_end); | |
2146 | if (flex_array_put(fa, i++, &info, GFP_KERNEL)) | |
2147 | BUG(); | |
640708a2 | 2148 | } |
640708a2 | 2149 | } |
f0c3b509 AV |
2150 | up_read(&mm->mmap_sem); |
2151 | ||
2152 | for (i = 0; i < nr_files; i++) { | |
2153 | p = flex_array_get(fa, i); | |
2154 | if (!proc_fill_cache(file, ctx, | |
2155 | p->name, p->len, | |
2156 | proc_map_files_instantiate, | |
2157 | task, | |
2158 | (void *)(unsigned long)p->mode)) | |
2159 | break; | |
2160 | ctx->pos++; | |
640708a2 | 2161 | } |
f0c3b509 AV |
2162 | if (fa) |
2163 | flex_array_free(fa); | |
2164 | mmput(mm); | |
640708a2 | 2165 | |
640708a2 PE |
2166 | out_put_task: |
2167 | put_task_struct(task); | |
2168 | out: | |
2169 | return ret; | |
2170 | } | |
2171 | ||
2172 | static const struct file_operations proc_map_files_operations = { | |
2173 | .read = generic_read_dir, | |
f50752ea AV |
2174 | .iterate_shared = proc_map_files_readdir, |
2175 | .llseek = generic_file_llseek, | |
640708a2 PE |
2176 | }; |
2177 | ||
b5946bea | 2178 | #ifdef CONFIG_CHECKPOINT_RESTORE |
48f6a7a5 PE |
2179 | struct timers_private { |
2180 | struct pid *pid; | |
2181 | struct task_struct *task; | |
2182 | struct sighand_struct *sighand; | |
57b8015e | 2183 | struct pid_namespace *ns; |
48f6a7a5 PE |
2184 | unsigned long flags; |
2185 | }; | |
2186 | ||
2187 | static void *timers_start(struct seq_file *m, loff_t *pos) | |
2188 | { | |
2189 | struct timers_private *tp = m->private; | |
2190 | ||
2191 | tp->task = get_pid_task(tp->pid, PIDTYPE_PID); | |
2192 | if (!tp->task) | |
2193 | return ERR_PTR(-ESRCH); | |
2194 | ||
2195 | tp->sighand = lock_task_sighand(tp->task, &tp->flags); | |
2196 | if (!tp->sighand) | |
2197 | return ERR_PTR(-ESRCH); | |
2198 | ||
2199 | return seq_list_start(&tp->task->signal->posix_timers, *pos); | |
2200 | } | |
2201 | ||
2202 | static void *timers_next(struct seq_file *m, void *v, loff_t *pos) | |
2203 | { | |
2204 | struct timers_private *tp = m->private; | |
2205 | return seq_list_next(v, &tp->task->signal->posix_timers, pos); | |
2206 | } | |
2207 | ||
2208 | static void timers_stop(struct seq_file *m, void *v) | |
2209 | { | |
2210 | struct timers_private *tp = m->private; | |
2211 | ||
2212 | if (tp->sighand) { | |
2213 | unlock_task_sighand(tp->task, &tp->flags); | |
2214 | tp->sighand = NULL; | |
2215 | } | |
2216 | ||
2217 | if (tp->task) { | |
2218 | put_task_struct(tp->task); | |
2219 | tp->task = NULL; | |
2220 | } | |
2221 | } | |
2222 | ||
2223 | static int show_timer(struct seq_file *m, void *v) | |
2224 | { | |
2225 | struct k_itimer *timer; | |
57b8015e PE |
2226 | struct timers_private *tp = m->private; |
2227 | int notify; | |
cedbccab | 2228 | static const char * const nstr[] = { |
57b8015e PE |
2229 | [SIGEV_SIGNAL] = "signal", |
2230 | [SIGEV_NONE] = "none", | |
2231 | [SIGEV_THREAD] = "thread", | |
2232 | }; | |
48f6a7a5 PE |
2233 | |
2234 | timer = list_entry((struct list_head *)v, struct k_itimer, list); | |
57b8015e PE |
2235 | notify = timer->it_sigev_notify; |
2236 | ||
48f6a7a5 | 2237 | seq_printf(m, "ID: %d\n", timer->it_id); |
25ce3191 JP |
2238 | seq_printf(m, "signal: %d/%p\n", |
2239 | timer->sigq->info.si_signo, | |
2240 | timer->sigq->info.si_value.sival_ptr); | |
57b8015e | 2241 | seq_printf(m, "notify: %s/%s.%d\n", |
25ce3191 JP |
2242 | nstr[notify & ~SIGEV_THREAD_ID], |
2243 | (notify & SIGEV_THREAD_ID) ? "tid" : "pid", | |
2244 | pid_nr_ns(timer->it_pid, tp->ns)); | |
15ef0298 | 2245 | seq_printf(m, "ClockID: %d\n", timer->it_clock); |
48f6a7a5 PE |
2246 | |
2247 | return 0; | |
2248 | } | |
2249 | ||
2250 | static const struct seq_operations proc_timers_seq_ops = { | |
2251 | .start = timers_start, | |
2252 | .next = timers_next, | |
2253 | .stop = timers_stop, | |
2254 | .show = show_timer, | |
2255 | }; | |
2256 | ||
2257 | static int proc_timers_open(struct inode *inode, struct file *file) | |
2258 | { | |
2259 | struct timers_private *tp; | |
2260 | ||
2261 | tp = __seq_open_private(file, &proc_timers_seq_ops, | |
2262 | sizeof(struct timers_private)); | |
2263 | if (!tp) | |
2264 | return -ENOMEM; | |
2265 | ||
2266 | tp->pid = proc_pid(inode); | |
57b8015e | 2267 | tp->ns = inode->i_sb->s_fs_info; |
48f6a7a5 PE |
2268 | return 0; |
2269 | } | |
2270 | ||
2271 | static const struct file_operations proc_timers_operations = { | |
2272 | .open = proc_timers_open, | |
2273 | .read = seq_read, | |
2274 | .llseek = seq_lseek, | |
2275 | .release = seq_release_private, | |
2276 | }; | |
b5946bea | 2277 | #endif |
640708a2 | 2278 | |
5de23d43 JS |
2279 | static ssize_t timerslack_ns_write(struct file *file, const char __user *buf, |
2280 | size_t count, loff_t *offset) | |
2281 | { | |
2282 | struct inode *inode = file_inode(file); | |
2283 | struct task_struct *p; | |
2284 | u64 slack_ns; | |
2285 | int err; | |
2286 | ||
2287 | err = kstrtoull_from_user(buf, count, 10, &slack_ns); | |
2288 | if (err < 0) | |
2289 | return err; | |
2290 | ||
2291 | p = get_proc_task(inode); | |
2292 | if (!p) | |
2293 | return -ESRCH; | |
2294 | ||
4b2bd5fe JS |
2295 | if (p != current) { |
2296 | if (!capable(CAP_SYS_NICE)) { | |
2297 | count = -EPERM; | |
2298 | goto out; | |
2299 | } | |
5de23d43 | 2300 | |
4b2bd5fe JS |
2301 | err = security_task_setscheduler(p); |
2302 | if (err) { | |
2303 | count = err; | |
2304 | goto out; | |
2305 | } | |
904763e1 JS |
2306 | } |
2307 | ||
7abbaf94 JS |
2308 | task_lock(p); |
2309 | if (slack_ns == 0) | |
2310 | p->timer_slack_ns = p->default_timer_slack_ns; | |
2311 | else | |
2312 | p->timer_slack_ns = slack_ns; | |
2313 | task_unlock(p); | |
2314 | ||
2315 | out: | |
5de23d43 JS |
2316 | put_task_struct(p); |
2317 | ||
2318 | return count; | |
2319 | } | |
2320 | ||
2321 | static int timerslack_ns_show(struct seq_file *m, void *v) | |
2322 | { | |
2323 | struct inode *inode = m->private; | |
2324 | struct task_struct *p; | |
7abbaf94 | 2325 | int err = 0; |
5de23d43 JS |
2326 | |
2327 | p = get_proc_task(inode); | |
2328 | if (!p) | |
2329 | return -ESRCH; | |
2330 | ||
4b2bd5fe | 2331 | if (p != current) { |
5de23d43 | 2332 | |
4b2bd5fe JS |
2333 | if (!capable(CAP_SYS_NICE)) { |
2334 | err = -EPERM; | |
2335 | goto out; | |
2336 | } | |
2337 | err = security_task_getscheduler(p); | |
2338 | if (err) | |
2339 | goto out; | |
2340 | } | |
904763e1 | 2341 | |
7abbaf94 JS |
2342 | task_lock(p); |
2343 | seq_printf(m, "%llu\n", p->timer_slack_ns); | |
2344 | task_unlock(p); | |
2345 | ||
2346 | out: | |
5de23d43 JS |
2347 | put_task_struct(p); |
2348 | ||
2349 | return err; | |
2350 | } | |
2351 | ||
2352 | static int timerslack_ns_open(struct inode *inode, struct file *filp) | |
2353 | { | |
2354 | return single_open(filp, timerslack_ns_show, inode); | |
2355 | } | |
2356 | ||
2357 | static const struct file_operations proc_pid_set_timerslack_ns_operations = { | |
2358 | .open = timerslack_ns_open, | |
2359 | .read = seq_read, | |
2360 | .write = timerslack_ns_write, | |
2361 | .llseek = seq_lseek, | |
2362 | .release = single_release, | |
2363 | }; | |
2364 | ||
c52a47ac | 2365 | static int proc_pident_instantiate(struct inode *dir, |
c5141e6d | 2366 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
444ceed8 | 2367 | { |
c5141e6d | 2368 | const struct pid_entry *p = ptr; |
444ceed8 EB |
2369 | struct inode *inode; |
2370 | struct proc_inode *ei; | |
444ceed8 | 2371 | |
61a28784 | 2372 | inode = proc_pid_make_inode(dir->i_sb, task); |
444ceed8 EB |
2373 | if (!inode) |
2374 | goto out; | |
2375 | ||
2376 | ei = PROC_I(inode); | |
2377 | inode->i_mode = p->mode; | |
2378 | if (S_ISDIR(inode->i_mode)) | |
bfe86848 | 2379 | set_nlink(inode, 2); /* Use getattr to fix if necessary */ |
444ceed8 EB |
2380 | if (p->iop) |
2381 | inode->i_op = p->iop; | |
2382 | if (p->fop) | |
2383 | inode->i_fop = p->fop; | |
2384 | ei->op = p->op; | |
fb045adb | 2385 | d_set_d_op(dentry, &pid_dentry_operations); |
444ceed8 EB |
2386 | d_add(dentry, inode); |
2387 | /* Close the race of the process dying before we return the dentry */ | |
0b728e19 | 2388 | if (pid_revalidate(dentry, 0)) |
c52a47ac | 2389 | return 0; |
444ceed8 | 2390 | out: |
c52a47ac | 2391 | return -ENOENT; |
444ceed8 EB |
2392 | } |
2393 | ||
1da177e4 LT |
2394 | static struct dentry *proc_pident_lookup(struct inode *dir, |
2395 | struct dentry *dentry, | |
c5141e6d | 2396 | const struct pid_entry *ents, |
7bcd6b0e | 2397 | unsigned int nents) |
1da177e4 | 2398 | { |
c52a47ac | 2399 | int error; |
99f89551 | 2400 | struct task_struct *task = get_proc_task(dir); |
c5141e6d | 2401 | const struct pid_entry *p, *last; |
1da177e4 | 2402 | |
c52a47ac | 2403 | error = -ENOENT; |
1da177e4 | 2404 | |
99f89551 EB |
2405 | if (!task) |
2406 | goto out_no_task; | |
1da177e4 | 2407 | |
20cdc894 EB |
2408 | /* |
2409 | * Yes, it does not scale. And it should not. Don't add | |
2410 | * new entries into /proc/<tgid>/ without very good reasons. | |
2411 | */ | |
7bcd6b0e EB |
2412 | last = &ents[nents - 1]; |
2413 | for (p = ents; p <= last; p++) { | |
1da177e4 LT |
2414 | if (p->len != dentry->d_name.len) |
2415 | continue; | |
2416 | if (!memcmp(dentry->d_name.name, p->name, p->len)) | |
2417 | break; | |
2418 | } | |
7bcd6b0e | 2419 | if (p > last) |
1da177e4 LT |
2420 | goto out; |
2421 | ||
444ceed8 | 2422 | error = proc_pident_instantiate(dir, dentry, task, p); |
1da177e4 | 2423 | out: |
99f89551 EB |
2424 | put_task_struct(task); |
2425 | out_no_task: | |
c52a47ac | 2426 | return ERR_PTR(error); |
1da177e4 LT |
2427 | } |
2428 | ||
f0c3b509 | 2429 | static int proc_pident_readdir(struct file *file, struct dir_context *ctx, |
c5141e6d | 2430 | const struct pid_entry *ents, unsigned int nents) |
28a6d671 | 2431 | { |
f0c3b509 AV |
2432 | struct task_struct *task = get_proc_task(file_inode(file)); |
2433 | const struct pid_entry *p; | |
28a6d671 | 2434 | |
28a6d671 | 2435 | if (!task) |
f0c3b509 | 2436 | return -ENOENT; |
28a6d671 | 2437 | |
f0c3b509 AV |
2438 | if (!dir_emit_dots(file, ctx)) |
2439 | goto out; | |
2440 | ||
2441 | if (ctx->pos >= nents + 2) | |
2442 | goto out; | |
28a6d671 | 2443 | |
f0c3b509 AV |
2444 | for (p = ents + (ctx->pos - 2); p <= ents + nents - 1; p++) { |
2445 | if (!proc_fill_cache(file, ctx, p->name, p->len, | |
2446 | proc_pident_instantiate, task, p)) | |
2447 | break; | |
2448 | ctx->pos++; | |
2449 | } | |
28a6d671 | 2450 | out: |
61a28784 | 2451 | put_task_struct(task); |
f0c3b509 | 2452 | return 0; |
1da177e4 LT |
2453 | } |
2454 | ||
28a6d671 EB |
2455 | #ifdef CONFIG_SECURITY |
2456 | static ssize_t proc_pid_attr_read(struct file * file, char __user * buf, | |
2457 | size_t count, loff_t *ppos) | |
2458 | { | |
496ad9aa | 2459 | struct inode * inode = file_inode(file); |
04ff9708 | 2460 | char *p = NULL; |
28a6d671 EB |
2461 | ssize_t length; |
2462 | struct task_struct *task = get_proc_task(inode); | |
2463 | ||
28a6d671 | 2464 | if (!task) |
04ff9708 | 2465 | return -ESRCH; |
28a6d671 EB |
2466 | |
2467 | length = security_getprocattr(task, | |
2fddfeef | 2468 | (char*)file->f_path.dentry->d_name.name, |
04ff9708 | 2469 | &p); |
28a6d671 | 2470 | put_task_struct(task); |
04ff9708 AV |
2471 | if (length > 0) |
2472 | length = simple_read_from_buffer(buf, count, ppos, p, length); | |
2473 | kfree(p); | |
28a6d671 | 2474 | return length; |
1da177e4 LT |
2475 | } |
2476 | ||
28a6d671 EB |
2477 | static ssize_t proc_pid_attr_write(struct file * file, const char __user * buf, |
2478 | size_t count, loff_t *ppos) | |
2479 | { | |
496ad9aa | 2480 | struct inode * inode = file_inode(file); |
bb646cdb | 2481 | void *page; |
28a6d671 EB |
2482 | ssize_t length; |
2483 | struct task_struct *task = get_proc_task(inode); | |
2484 | ||
2485 | length = -ESRCH; | |
2486 | if (!task) | |
2487 | goto out_no_task; | |
2488 | if (count > PAGE_SIZE) | |
2489 | count = PAGE_SIZE; | |
2490 | ||
2491 | /* No partial writes. */ | |
2492 | length = -EINVAL; | |
2493 | if (*ppos != 0) | |
2494 | goto out; | |
2495 | ||
bb646cdb AV |
2496 | page = memdup_user(buf, count); |
2497 | if (IS_ERR(page)) { | |
2498 | length = PTR_ERR(page); | |
28a6d671 | 2499 | goto out; |
bb646cdb | 2500 | } |
28a6d671 | 2501 | |
107db7c7 | 2502 | /* Guard against adverse ptrace interaction */ |
9b1bf12d | 2503 | length = mutex_lock_interruptible(&task->signal->cred_guard_mutex); |
107db7c7 DH |
2504 | if (length < 0) |
2505 | goto out_free; | |
2506 | ||
28a6d671 | 2507 | length = security_setprocattr(task, |
2fddfeef | 2508 | (char*)file->f_path.dentry->d_name.name, |
bb646cdb | 2509 | page, count); |
9b1bf12d | 2510 | mutex_unlock(&task->signal->cred_guard_mutex); |
28a6d671 | 2511 | out_free: |
bb646cdb | 2512 | kfree(page); |
28a6d671 EB |
2513 | out: |
2514 | put_task_struct(task); | |
2515 | out_no_task: | |
2516 | return length; | |
2517 | } | |
2518 | ||
00977a59 | 2519 | static const struct file_operations proc_pid_attr_operations = { |
28a6d671 EB |
2520 | .read = proc_pid_attr_read, |
2521 | .write = proc_pid_attr_write, | |
87df8424 | 2522 | .llseek = generic_file_llseek, |
28a6d671 EB |
2523 | }; |
2524 | ||
c5141e6d | 2525 | static const struct pid_entry attr_dir_stuff[] = { |
631f9c18 AD |
2526 | REG("current", S_IRUGO|S_IWUGO, proc_pid_attr_operations), |
2527 | REG("prev", S_IRUGO, proc_pid_attr_operations), | |
2528 | REG("exec", S_IRUGO|S_IWUGO, proc_pid_attr_operations), | |
2529 | REG("fscreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations), | |
2530 | REG("keycreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations), | |
2531 | REG("sockcreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations), | |
28a6d671 EB |
2532 | }; |
2533 | ||
f0c3b509 | 2534 | static int proc_attr_dir_readdir(struct file *file, struct dir_context *ctx) |
28a6d671 | 2535 | { |
f0c3b509 AV |
2536 | return proc_pident_readdir(file, ctx, |
2537 | attr_dir_stuff, ARRAY_SIZE(attr_dir_stuff)); | |
28a6d671 EB |
2538 | } |
2539 | ||
00977a59 | 2540 | static const struct file_operations proc_attr_dir_operations = { |
1da177e4 | 2541 | .read = generic_read_dir, |
f50752ea AV |
2542 | .iterate_shared = proc_attr_dir_readdir, |
2543 | .llseek = generic_file_llseek, | |
1da177e4 LT |
2544 | }; |
2545 | ||
72d9dcfc | 2546 | static struct dentry *proc_attr_dir_lookup(struct inode *dir, |
00cd8dd3 | 2547 | struct dentry *dentry, unsigned int flags) |
28a6d671 | 2548 | { |
7bcd6b0e EB |
2549 | return proc_pident_lookup(dir, dentry, |
2550 | attr_dir_stuff, ARRAY_SIZE(attr_dir_stuff)); | |
28a6d671 EB |
2551 | } |
2552 | ||
c5ef1c42 | 2553 | static const struct inode_operations proc_attr_dir_inode_operations = { |
72d9dcfc | 2554 | .lookup = proc_attr_dir_lookup, |
99f89551 | 2555 | .getattr = pid_getattr, |
6d76fa58 | 2556 | .setattr = proc_setattr, |
1da177e4 LT |
2557 | }; |
2558 | ||
28a6d671 EB |
2559 | #endif |
2560 | ||
698ba7b5 | 2561 | #ifdef CONFIG_ELF_CORE |
3cb4a0bb KH |
2562 | static ssize_t proc_coredump_filter_read(struct file *file, char __user *buf, |
2563 | size_t count, loff_t *ppos) | |
2564 | { | |
496ad9aa | 2565 | struct task_struct *task = get_proc_task(file_inode(file)); |
3cb4a0bb KH |
2566 | struct mm_struct *mm; |
2567 | char buffer[PROC_NUMBUF]; | |
2568 | size_t len; | |
2569 | int ret; | |
2570 | ||
2571 | if (!task) | |
2572 | return -ESRCH; | |
2573 | ||
2574 | ret = 0; | |
2575 | mm = get_task_mm(task); | |
2576 | if (mm) { | |
2577 | len = snprintf(buffer, sizeof(buffer), "%08lx\n", | |
2578 | ((mm->flags & MMF_DUMP_FILTER_MASK) >> | |
2579 | MMF_DUMP_FILTER_SHIFT)); | |
2580 | mmput(mm); | |
2581 | ret = simple_read_from_buffer(buf, count, ppos, buffer, len); | |
2582 | } | |
2583 | ||
2584 | put_task_struct(task); | |
2585 | ||
2586 | return ret; | |
2587 | } | |
2588 | ||
2589 | static ssize_t proc_coredump_filter_write(struct file *file, | |
2590 | const char __user *buf, | |
2591 | size_t count, | |
2592 | loff_t *ppos) | |
2593 | { | |
2594 | struct task_struct *task; | |
2595 | struct mm_struct *mm; | |
3cb4a0bb KH |
2596 | unsigned int val; |
2597 | int ret; | |
2598 | int i; | |
2599 | unsigned long mask; | |
2600 | ||
774636e1 AD |
2601 | ret = kstrtouint_from_user(buf, count, 0, &val); |
2602 | if (ret < 0) | |
2603 | return ret; | |
3cb4a0bb KH |
2604 | |
2605 | ret = -ESRCH; | |
496ad9aa | 2606 | task = get_proc_task(file_inode(file)); |
3cb4a0bb KH |
2607 | if (!task) |
2608 | goto out_no_task; | |
2609 | ||
3cb4a0bb KH |
2610 | mm = get_task_mm(task); |
2611 | if (!mm) | |
2612 | goto out_no_mm; | |
41a0c249 | 2613 | ret = 0; |
3cb4a0bb KH |
2614 | |
2615 | for (i = 0, mask = 1; i < MMF_DUMP_FILTER_BITS; i++, mask <<= 1) { | |
2616 | if (val & mask) | |
2617 | set_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags); | |
2618 | else | |
2619 | clear_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags); | |
2620 | } | |
2621 | ||
2622 | mmput(mm); | |
2623 | out_no_mm: | |
2624 | put_task_struct(task); | |
2625 | out_no_task: | |
774636e1 AD |
2626 | if (ret < 0) |
2627 | return ret; | |
2628 | return count; | |
3cb4a0bb KH |
2629 | } |
2630 | ||
2631 | static const struct file_operations proc_coredump_filter_operations = { | |
2632 | .read = proc_coredump_filter_read, | |
2633 | .write = proc_coredump_filter_write, | |
87df8424 | 2634 | .llseek = generic_file_llseek, |
3cb4a0bb KH |
2635 | }; |
2636 | #endif | |
2637 | ||
aba76fdb | 2638 | #ifdef CONFIG_TASK_IO_ACCOUNTING |
19aadc98 | 2639 | static int do_io_accounting(struct task_struct *task, struct seq_file *m, int whole) |
297c5d92 | 2640 | { |
940389b8 | 2641 | struct task_io_accounting acct = task->ioac; |
5995477a | 2642 | unsigned long flags; |
293eb1e7 | 2643 | int result; |
5995477a | 2644 | |
293eb1e7 VK |
2645 | result = mutex_lock_killable(&task->signal->cred_guard_mutex); |
2646 | if (result) | |
2647 | return result; | |
2648 | ||
caaee623 | 2649 | if (!ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS)) { |
293eb1e7 VK |
2650 | result = -EACCES; |
2651 | goto out_unlock; | |
2652 | } | |
1d1221f3 | 2653 | |
5995477a AR |
2654 | if (whole && lock_task_sighand(task, &flags)) { |
2655 | struct task_struct *t = task; | |
2656 | ||
2657 | task_io_accounting_add(&acct, &task->signal->ioac); | |
2658 | while_each_thread(task, t) | |
2659 | task_io_accounting_add(&acct, &t->ioac); | |
2660 | ||
2661 | unlock_task_sighand(task, &flags); | |
297c5d92 | 2662 | } |
25ce3191 JP |
2663 | seq_printf(m, |
2664 | "rchar: %llu\n" | |
2665 | "wchar: %llu\n" | |
2666 | "syscr: %llu\n" | |
2667 | "syscw: %llu\n" | |
2668 | "read_bytes: %llu\n" | |
2669 | "write_bytes: %llu\n" | |
2670 | "cancelled_write_bytes: %llu\n", | |
2671 | (unsigned long long)acct.rchar, | |
2672 | (unsigned long long)acct.wchar, | |
2673 | (unsigned long long)acct.syscr, | |
2674 | (unsigned long long)acct.syscw, | |
2675 | (unsigned long long)acct.read_bytes, | |
2676 | (unsigned long long)acct.write_bytes, | |
2677 | (unsigned long long)acct.cancelled_write_bytes); | |
2678 | result = 0; | |
2679 | ||
293eb1e7 VK |
2680 | out_unlock: |
2681 | mutex_unlock(&task->signal->cred_guard_mutex); | |
2682 | return result; | |
297c5d92 AR |
2683 | } |
2684 | ||
19aadc98 AD |
2685 | static int proc_tid_io_accounting(struct seq_file *m, struct pid_namespace *ns, |
2686 | struct pid *pid, struct task_struct *task) | |
297c5d92 | 2687 | { |
19aadc98 | 2688 | return do_io_accounting(task, m, 0); |
aba76fdb | 2689 | } |
297c5d92 | 2690 | |
19aadc98 AD |
2691 | static int proc_tgid_io_accounting(struct seq_file *m, struct pid_namespace *ns, |
2692 | struct pid *pid, struct task_struct *task) | |
297c5d92 | 2693 | { |
19aadc98 | 2694 | return do_io_accounting(task, m, 1); |
297c5d92 AR |
2695 | } |
2696 | #endif /* CONFIG_TASK_IO_ACCOUNTING */ | |
aba76fdb | 2697 | |
22d917d8 EB |
2698 | #ifdef CONFIG_USER_NS |
2699 | static int proc_id_map_open(struct inode *inode, struct file *file, | |
ccf94f1b | 2700 | const struct seq_operations *seq_ops) |
22d917d8 EB |
2701 | { |
2702 | struct user_namespace *ns = NULL; | |
2703 | struct task_struct *task; | |
2704 | struct seq_file *seq; | |
2705 | int ret = -EINVAL; | |
2706 | ||
2707 | task = get_proc_task(inode); | |
2708 | if (task) { | |
2709 | rcu_read_lock(); | |
2710 | ns = get_user_ns(task_cred_xxx(task, user_ns)); | |
2711 | rcu_read_unlock(); | |
2712 | put_task_struct(task); | |
2713 | } | |
2714 | if (!ns) | |
2715 | goto err; | |
2716 | ||
2717 | ret = seq_open(file, seq_ops); | |
2718 | if (ret) | |
2719 | goto err_put_ns; | |
2720 | ||
2721 | seq = file->private_data; | |
2722 | seq->private = ns; | |
2723 | ||
2724 | return 0; | |
2725 | err_put_ns: | |
2726 | put_user_ns(ns); | |
2727 | err: | |
2728 | return ret; | |
2729 | } | |
2730 | ||
2731 | static int proc_id_map_release(struct inode *inode, struct file *file) | |
2732 | { | |
2733 | struct seq_file *seq = file->private_data; | |
2734 | struct user_namespace *ns = seq->private; | |
2735 | put_user_ns(ns); | |
2736 | return seq_release(inode, file); | |
2737 | } | |
2738 | ||
2739 | static int proc_uid_map_open(struct inode *inode, struct file *file) | |
2740 | { | |
2741 | return proc_id_map_open(inode, file, &proc_uid_seq_operations); | |
2742 | } | |
2743 | ||
2744 | static int proc_gid_map_open(struct inode *inode, struct file *file) | |
2745 | { | |
2746 | return proc_id_map_open(inode, file, &proc_gid_seq_operations); | |
2747 | } | |
2748 | ||
f76d207a EB |
2749 | static int proc_projid_map_open(struct inode *inode, struct file *file) |
2750 | { | |
2751 | return proc_id_map_open(inode, file, &proc_projid_seq_operations); | |
2752 | } | |
2753 | ||
22d917d8 EB |
2754 | static const struct file_operations proc_uid_map_operations = { |
2755 | .open = proc_uid_map_open, | |
2756 | .write = proc_uid_map_write, | |
2757 | .read = seq_read, | |
2758 | .llseek = seq_lseek, | |
2759 | .release = proc_id_map_release, | |
2760 | }; | |
2761 | ||
2762 | static const struct file_operations proc_gid_map_operations = { | |
2763 | .open = proc_gid_map_open, | |
2764 | .write = proc_gid_map_write, | |
2765 | .read = seq_read, | |
2766 | .llseek = seq_lseek, | |
2767 | .release = proc_id_map_release, | |
2768 | }; | |
f76d207a EB |
2769 | |
2770 | static const struct file_operations proc_projid_map_operations = { | |
2771 | .open = proc_projid_map_open, | |
2772 | .write = proc_projid_map_write, | |
2773 | .read = seq_read, | |
2774 | .llseek = seq_lseek, | |
2775 | .release = proc_id_map_release, | |
2776 | }; | |
9cc46516 EB |
2777 | |
2778 | static int proc_setgroups_open(struct inode *inode, struct file *file) | |
2779 | { | |
2780 | struct user_namespace *ns = NULL; | |
2781 | struct task_struct *task; | |
2782 | int ret; | |
2783 | ||
2784 | ret = -ESRCH; | |
2785 | task = get_proc_task(inode); | |
2786 | if (task) { | |
2787 | rcu_read_lock(); | |
2788 | ns = get_user_ns(task_cred_xxx(task, user_ns)); | |
2789 | rcu_read_unlock(); | |
2790 | put_task_struct(task); | |
2791 | } | |
2792 | if (!ns) | |
2793 | goto err; | |
2794 | ||
2795 | if (file->f_mode & FMODE_WRITE) { | |
2796 | ret = -EACCES; | |
2797 | if (!ns_capable(ns, CAP_SYS_ADMIN)) | |
2798 | goto err_put_ns; | |
2799 | } | |
2800 | ||
2801 | ret = single_open(file, &proc_setgroups_show, ns); | |
2802 | if (ret) | |
2803 | goto err_put_ns; | |
2804 | ||
2805 | return 0; | |
2806 | err_put_ns: | |
2807 | put_user_ns(ns); | |
2808 | err: | |
2809 | return ret; | |
2810 | } | |
2811 | ||
2812 | static int proc_setgroups_release(struct inode *inode, struct file *file) | |
2813 | { | |
2814 | struct seq_file *seq = file->private_data; | |
2815 | struct user_namespace *ns = seq->private; | |
2816 | int ret = single_release(inode, file); | |
2817 | put_user_ns(ns); | |
2818 | return ret; | |
2819 | } | |
2820 | ||
2821 | static const struct file_operations proc_setgroups_operations = { | |
2822 | .open = proc_setgroups_open, | |
2823 | .write = proc_setgroups_write, | |
2824 | .read = seq_read, | |
2825 | .llseek = seq_lseek, | |
2826 | .release = proc_setgroups_release, | |
2827 | }; | |
22d917d8 EB |
2828 | #endif /* CONFIG_USER_NS */ |
2829 | ||
47830723 KC |
2830 | static int proc_pid_personality(struct seq_file *m, struct pid_namespace *ns, |
2831 | struct pid *pid, struct task_struct *task) | |
2832 | { | |
a9712bc1 AV |
2833 | int err = lock_trace(task); |
2834 | if (!err) { | |
2835 | seq_printf(m, "%08x\n", task->personality); | |
2836 | unlock_trace(task); | |
2837 | } | |
2838 | return err; | |
47830723 KC |
2839 | } |
2840 | ||
28a6d671 EB |
2841 | /* |
2842 | * Thread groups | |
2843 | */ | |
00977a59 | 2844 | static const struct file_operations proc_task_operations; |
c5ef1c42 | 2845 | static const struct inode_operations proc_task_inode_operations; |
20cdc894 | 2846 | |
c5141e6d | 2847 | static const struct pid_entry tgid_base_stuff[] = { |
631f9c18 AD |
2848 | DIR("task", S_IRUGO|S_IXUGO, proc_task_inode_operations, proc_task_operations), |
2849 | DIR("fd", S_IRUSR|S_IXUSR, proc_fd_inode_operations, proc_fd_operations), | |
640708a2 | 2850 | DIR("map_files", S_IRUSR|S_IXUSR, proc_map_files_inode_operations, proc_map_files_operations), |
631f9c18 | 2851 | DIR("fdinfo", S_IRUSR|S_IXUSR, proc_fdinfo_inode_operations, proc_fdinfo_operations), |
6b4e306a | 2852 | DIR("ns", S_IRUSR|S_IXUGO, proc_ns_dir_inode_operations, proc_ns_dir_operations), |
b2211a36 | 2853 | #ifdef CONFIG_NET |
631f9c18 | 2854 | DIR("net", S_IRUGO|S_IXUGO, proc_net_inode_operations, proc_net_operations), |
b2211a36 | 2855 | #endif |
631f9c18 | 2856 | REG("environ", S_IRUSR, proc_environ_operations), |
c5317167 | 2857 | REG("auxv", S_IRUSR, proc_auxv_operations), |
631f9c18 | 2858 | ONE("status", S_IRUGO, proc_pid_status), |
35a35046 | 2859 | ONE("personality", S_IRUSR, proc_pid_personality), |
1c963eb1 | 2860 | ONE("limits", S_IRUGO, proc_pid_limits), |
43ae34cb | 2861 | #ifdef CONFIG_SCHED_DEBUG |
631f9c18 | 2862 | REG("sched", S_IRUGO|S_IWUSR, proc_pid_sched_operations), |
5091faa4 MG |
2863 | #endif |
2864 | #ifdef CONFIG_SCHED_AUTOGROUP | |
2865 | REG("autogroup", S_IRUGO|S_IWUSR, proc_pid_sched_autogroup_operations), | |
ebcb6734 | 2866 | #endif |
4614a696 | 2867 | REG("comm", S_IRUGO|S_IWUSR, proc_pid_set_comm_operations), |
ebcb6734 | 2868 | #ifdef CONFIG_HAVE_ARCH_TRACEHOOK |
09d93bd6 | 2869 | ONE("syscall", S_IRUSR, proc_pid_syscall), |
43ae34cb | 2870 | #endif |
c2c0bb44 | 2871 | REG("cmdline", S_IRUGO, proc_pid_cmdline_ops), |
631f9c18 AD |
2872 | ONE("stat", S_IRUGO, proc_tgid_stat), |
2873 | ONE("statm", S_IRUGO, proc_pid_statm), | |
b7643757 | 2874 | REG("maps", S_IRUGO, proc_pid_maps_operations), |
28a6d671 | 2875 | #ifdef CONFIG_NUMA |
b7643757 | 2876 | REG("numa_maps", S_IRUGO, proc_pid_numa_maps_operations), |
28a6d671 | 2877 | #endif |
631f9c18 AD |
2878 | REG("mem", S_IRUSR|S_IWUSR, proc_mem_operations), |
2879 | LNK("cwd", proc_cwd_link), | |
2880 | LNK("root", proc_root_link), | |
2881 | LNK("exe", proc_exe_link), | |
2882 | REG("mounts", S_IRUGO, proc_mounts_operations), | |
2883 | REG("mountinfo", S_IRUGO, proc_mountinfo_operations), | |
2884 | REG("mountstats", S_IRUSR, proc_mountstats_operations), | |
1e883281 | 2885 | #ifdef CONFIG_PROC_PAGE_MONITOR |
631f9c18 | 2886 | REG("clear_refs", S_IWUSR, proc_clear_refs_operations), |
b7643757 | 2887 | REG("smaps", S_IRUGO, proc_pid_smaps_operations), |
32ed74a4 | 2888 | REG("pagemap", S_IRUSR, proc_pagemap_operations), |
28a6d671 EB |
2889 | #endif |
2890 | #ifdef CONFIG_SECURITY | |
631f9c18 | 2891 | DIR("attr", S_IRUGO|S_IXUGO, proc_attr_dir_inode_operations, proc_attr_dir_operations), |
28a6d671 EB |
2892 | #endif |
2893 | #ifdef CONFIG_KALLSYMS | |
edfcd606 | 2894 | ONE("wchan", S_IRUGO, proc_pid_wchan), |
28a6d671 | 2895 | #endif |
2ec220e2 | 2896 | #ifdef CONFIG_STACKTRACE |
35a35046 | 2897 | ONE("stack", S_IRUSR, proc_pid_stack), |
28a6d671 | 2898 | #endif |
5968cece | 2899 | #ifdef CONFIG_SCHED_INFO |
f6e826ca | 2900 | ONE("schedstat", S_IRUGO, proc_pid_schedstat), |
28a6d671 | 2901 | #endif |
9745512c | 2902 | #ifdef CONFIG_LATENCYTOP |
631f9c18 | 2903 | REG("latency", S_IRUGO, proc_lstats_operations), |
9745512c | 2904 | #endif |
8793d854 | 2905 | #ifdef CONFIG_PROC_PID_CPUSET |
52de4779 | 2906 | ONE("cpuset", S_IRUGO, proc_cpuset_show), |
a424316c PM |
2907 | #endif |
2908 | #ifdef CONFIG_CGROUPS | |
006f4ac4 | 2909 | ONE("cgroup", S_IRUGO, proc_cgroup_show), |
28a6d671 | 2910 | #endif |
6ba51e37 | 2911 | ONE("oom_score", S_IRUGO, proc_oom_score), |
fa0cbbf1 | 2912 | REG("oom_adj", S_IRUGO|S_IWUSR, proc_oom_adj_operations), |
a63d83f4 | 2913 | REG("oom_score_adj", S_IRUGO|S_IWUSR, proc_oom_score_adj_operations), |
28a6d671 | 2914 | #ifdef CONFIG_AUDITSYSCALL |
631f9c18 AD |
2915 | REG("loginuid", S_IWUSR|S_IRUGO, proc_loginuid_operations), |
2916 | REG("sessionid", S_IRUGO, proc_sessionid_operations), | |
28a6d671 | 2917 | #endif |
f4f154fd | 2918 | #ifdef CONFIG_FAULT_INJECTION |
631f9c18 | 2919 | REG("make-it-fail", S_IRUGO|S_IWUSR, proc_fault_inject_operations), |
f4f154fd | 2920 | #endif |
698ba7b5 | 2921 | #ifdef CONFIG_ELF_CORE |
631f9c18 | 2922 | REG("coredump_filter", S_IRUGO|S_IWUSR, proc_coredump_filter_operations), |
3cb4a0bb | 2923 | #endif |
aba76fdb | 2924 | #ifdef CONFIG_TASK_IO_ACCOUNTING |
19aadc98 | 2925 | ONE("io", S_IRUSR, proc_tgid_io_accounting), |
aba76fdb | 2926 | #endif |
f133ecca | 2927 | #ifdef CONFIG_HARDWALL |
d962c144 | 2928 | ONE("hardwall", S_IRUGO, proc_pid_hardwall), |
f133ecca | 2929 | #endif |
22d917d8 EB |
2930 | #ifdef CONFIG_USER_NS |
2931 | REG("uid_map", S_IRUGO|S_IWUSR, proc_uid_map_operations), | |
2932 | REG("gid_map", S_IRUGO|S_IWUSR, proc_gid_map_operations), | |
f76d207a | 2933 | REG("projid_map", S_IRUGO|S_IWUSR, proc_projid_map_operations), |
9cc46516 | 2934 | REG("setgroups", S_IRUGO|S_IWUSR, proc_setgroups_operations), |
22d917d8 | 2935 | #endif |
48f6a7a5 PE |
2936 | #ifdef CONFIG_CHECKPOINT_RESTORE |
2937 | REG("timers", S_IRUGO, proc_timers_operations), | |
2938 | #endif | |
5de23d43 | 2939 | REG("timerslack_ns", S_IRUGO|S_IWUGO, proc_pid_set_timerslack_ns_operations), |
28a6d671 | 2940 | }; |
1da177e4 | 2941 | |
f0c3b509 | 2942 | static int proc_tgid_base_readdir(struct file *file, struct dir_context *ctx) |
1da177e4 | 2943 | { |
f0c3b509 AV |
2944 | return proc_pident_readdir(file, ctx, |
2945 | tgid_base_stuff, ARRAY_SIZE(tgid_base_stuff)); | |
1da177e4 LT |
2946 | } |
2947 | ||
00977a59 | 2948 | static const struct file_operations proc_tgid_base_operations = { |
1da177e4 | 2949 | .read = generic_read_dir, |
f50752ea AV |
2950 | .iterate_shared = proc_tgid_base_readdir, |
2951 | .llseek = generic_file_llseek, | |
1da177e4 LT |
2952 | }; |
2953 | ||
00cd8dd3 AV |
2954 | static struct dentry *proc_tgid_base_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags) |
2955 | { | |
7bcd6b0e EB |
2956 | return proc_pident_lookup(dir, dentry, |
2957 | tgid_base_stuff, ARRAY_SIZE(tgid_base_stuff)); | |
1da177e4 LT |
2958 | } |
2959 | ||
c5ef1c42 | 2960 | static const struct inode_operations proc_tgid_base_inode_operations = { |
28a6d671 | 2961 | .lookup = proc_tgid_base_lookup, |
99f89551 | 2962 | .getattr = pid_getattr, |
6d76fa58 | 2963 | .setattr = proc_setattr, |
0499680a | 2964 | .permission = proc_pid_permission, |
1da177e4 | 2965 | }; |
1da177e4 | 2966 | |
60347f67 | 2967 | static void proc_flush_task_mnt(struct vfsmount *mnt, pid_t pid, pid_t tgid) |
1da177e4 | 2968 | { |
48e6484d | 2969 | struct dentry *dentry, *leader, *dir; |
8578cea7 | 2970 | char buf[PROC_NUMBUF]; |
48e6484d EB |
2971 | struct qstr name; |
2972 | ||
2973 | name.name = buf; | |
60347f67 | 2974 | name.len = snprintf(buf, sizeof(buf), "%d", pid); |
4f522a24 | 2975 | /* no ->d_hash() rejects on procfs */ |
60347f67 | 2976 | dentry = d_hash_and_lookup(mnt->mnt_root, &name); |
48e6484d | 2977 | if (dentry) { |
bbd51924 | 2978 | d_invalidate(dentry); |
48e6484d EB |
2979 | dput(dentry); |
2980 | } | |
1da177e4 | 2981 | |
c35a7f18 ON |
2982 | if (pid == tgid) |
2983 | return; | |
2984 | ||
48e6484d | 2985 | name.name = buf; |
60347f67 PE |
2986 | name.len = snprintf(buf, sizeof(buf), "%d", tgid); |
2987 | leader = d_hash_and_lookup(mnt->mnt_root, &name); | |
48e6484d EB |
2988 | if (!leader) |
2989 | goto out; | |
1da177e4 | 2990 | |
48e6484d EB |
2991 | name.name = "task"; |
2992 | name.len = strlen(name.name); | |
2993 | dir = d_hash_and_lookup(leader, &name); | |
2994 | if (!dir) | |
2995 | goto out_put_leader; | |
2996 | ||
2997 | name.name = buf; | |
60347f67 | 2998 | name.len = snprintf(buf, sizeof(buf), "%d", pid); |
48e6484d EB |
2999 | dentry = d_hash_and_lookup(dir, &name); |
3000 | if (dentry) { | |
bbd51924 | 3001 | d_invalidate(dentry); |
48e6484d | 3002 | dput(dentry); |
1da177e4 | 3003 | } |
48e6484d EB |
3004 | |
3005 | dput(dir); | |
3006 | out_put_leader: | |
3007 | dput(leader); | |
3008 | out: | |
3009 | return; | |
1da177e4 LT |
3010 | } |
3011 | ||
0895e91d RD |
3012 | /** |
3013 | * proc_flush_task - Remove dcache entries for @task from the /proc dcache. | |
3014 | * @task: task that should be flushed. | |
3015 | * | |
3016 | * When flushing dentries from proc, one needs to flush them from global | |
60347f67 | 3017 | * proc (proc_mnt) and from all the namespaces' procs this task was seen |
0895e91d RD |
3018 | * in. This call is supposed to do all of this job. |
3019 | * | |
3020 | * Looks in the dcache for | |
3021 | * /proc/@pid | |
3022 | * /proc/@tgid/task/@pid | |
3023 | * if either directory is present flushes it and all of it'ts children | |
3024 | * from the dcache. | |
3025 | * | |
3026 | * It is safe and reasonable to cache /proc entries for a task until | |
3027 | * that task exits. After that they just clog up the dcache with | |
3028 | * useless entries, possibly causing useful dcache entries to be | |
3029 | * flushed instead. This routine is proved to flush those useless | |
3030 | * dcache entries at process exit time. | |
3031 | * | |
3032 | * NOTE: This routine is just an optimization so it does not guarantee | |
3033 | * that no dcache entries will exist at process exit time it | |
3034 | * just makes it very unlikely that any will persist. | |
60347f67 PE |
3035 | */ |
3036 | ||
3037 | void proc_flush_task(struct task_struct *task) | |
3038 | { | |
9fcc2d15 | 3039 | int i; |
9b4d1cbe | 3040 | struct pid *pid, *tgid; |
130f77ec PE |
3041 | struct upid *upid; |
3042 | ||
130f77ec | 3043 | pid = task_pid(task); |
9b4d1cbe | 3044 | tgid = task_tgid(task); |
130f77ec | 3045 | |
9fcc2d15 | 3046 | for (i = 0; i <= pid->level; i++) { |
130f77ec PE |
3047 | upid = &pid->numbers[i]; |
3048 | proc_flush_task_mnt(upid->ns->proc_mnt, upid->nr, | |
9b4d1cbe | 3049 | tgid->numbers[i].nr); |
130f77ec | 3050 | } |
60347f67 PE |
3051 | } |
3052 | ||
c52a47ac AV |
3053 | static int proc_pid_instantiate(struct inode *dir, |
3054 | struct dentry * dentry, | |
3055 | struct task_struct *task, const void *ptr) | |
444ceed8 | 3056 | { |
444ceed8 EB |
3057 | struct inode *inode; |
3058 | ||
61a28784 | 3059 | inode = proc_pid_make_inode(dir->i_sb, task); |
444ceed8 EB |
3060 | if (!inode) |
3061 | goto out; | |
3062 | ||
3063 | inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO; | |
3064 | inode->i_op = &proc_tgid_base_inode_operations; | |
3065 | inode->i_fop = &proc_tgid_base_operations; | |
3066 | inode->i_flags|=S_IMMUTABLE; | |
aed54175 | 3067 | |
bfe86848 MS |
3068 | set_nlink(inode, 2 + pid_entry_count_dirs(tgid_base_stuff, |
3069 | ARRAY_SIZE(tgid_base_stuff))); | |
444ceed8 | 3070 | |
fb045adb | 3071 | d_set_d_op(dentry, &pid_dentry_operations); |
444ceed8 EB |
3072 | |
3073 | d_add(dentry, inode); | |
3074 | /* Close the race of the process dying before we return the dentry */ | |
0b728e19 | 3075 | if (pid_revalidate(dentry, 0)) |
c52a47ac | 3076 | return 0; |
444ceed8 | 3077 | out: |
c52a47ac | 3078 | return -ENOENT; |
444ceed8 EB |
3079 | } |
3080 | ||
00cd8dd3 | 3081 | struct dentry *proc_pid_lookup(struct inode *dir, struct dentry * dentry, unsigned int flags) |
1da177e4 | 3082 | { |
335eb531 | 3083 | int result = -ENOENT; |
1da177e4 | 3084 | struct task_struct *task; |
1da177e4 | 3085 | unsigned tgid; |
b488893a | 3086 | struct pid_namespace *ns; |
1da177e4 | 3087 | |
dbcdb504 | 3088 | tgid = name_to_int(&dentry->d_name); |
1da177e4 LT |
3089 | if (tgid == ~0U) |
3090 | goto out; | |
3091 | ||
b488893a | 3092 | ns = dentry->d_sb->s_fs_info; |
de758734 | 3093 | rcu_read_lock(); |
b488893a | 3094 | task = find_task_by_pid_ns(tgid, ns); |
1da177e4 LT |
3095 | if (task) |
3096 | get_task_struct(task); | |
de758734 | 3097 | rcu_read_unlock(); |
1da177e4 LT |
3098 | if (!task) |
3099 | goto out; | |
3100 | ||
444ceed8 | 3101 | result = proc_pid_instantiate(dir, dentry, task, NULL); |
1da177e4 | 3102 | put_task_struct(task); |
1da177e4 | 3103 | out: |
c52a47ac | 3104 | return ERR_PTR(result); |
1da177e4 LT |
3105 | } |
3106 | ||
1da177e4 | 3107 | /* |
0804ef4b | 3108 | * Find the first task with tgid >= tgid |
0bc58a91 | 3109 | * |
1da177e4 | 3110 | */ |
19fd4bb2 EB |
3111 | struct tgid_iter { |
3112 | unsigned int tgid; | |
0804ef4b | 3113 | struct task_struct *task; |
19fd4bb2 EB |
3114 | }; |
3115 | static struct tgid_iter next_tgid(struct pid_namespace *ns, struct tgid_iter iter) | |
3116 | { | |
0804ef4b | 3117 | struct pid *pid; |
1da177e4 | 3118 | |
19fd4bb2 EB |
3119 | if (iter.task) |
3120 | put_task_struct(iter.task); | |
454cc105 | 3121 | rcu_read_lock(); |
0804ef4b | 3122 | retry: |
19fd4bb2 EB |
3123 | iter.task = NULL; |
3124 | pid = find_ge_pid(iter.tgid, ns); | |
0804ef4b | 3125 | if (pid) { |
19fd4bb2 EB |
3126 | iter.tgid = pid_nr_ns(pid, ns); |
3127 | iter.task = pid_task(pid, PIDTYPE_PID); | |
0804ef4b EB |
3128 | /* What we to know is if the pid we have find is the |
3129 | * pid of a thread_group_leader. Testing for task | |
3130 | * being a thread_group_leader is the obvious thing | |
3131 | * todo but there is a window when it fails, due to | |
3132 | * the pid transfer logic in de_thread. | |
3133 | * | |
3134 | * So we perform the straight forward test of seeing | |
3135 | * if the pid we have found is the pid of a thread | |
3136 | * group leader, and don't worry if the task we have | |
3137 | * found doesn't happen to be a thread group leader. | |
3138 | * As we don't care in the case of readdir. | |
3139 | */ | |
19fd4bb2 EB |
3140 | if (!iter.task || !has_group_leader_pid(iter.task)) { |
3141 | iter.tgid += 1; | |
0804ef4b | 3142 | goto retry; |
19fd4bb2 EB |
3143 | } |
3144 | get_task_struct(iter.task); | |
0bc58a91 | 3145 | } |
454cc105 | 3146 | rcu_read_unlock(); |
19fd4bb2 | 3147 | return iter; |
1da177e4 LT |
3148 | } |
3149 | ||
0097875b | 3150 | #define TGID_OFFSET (FIRST_PROCESS_ENTRY + 2) |
0804ef4b | 3151 | |
1da177e4 | 3152 | /* for the /proc/ directory itself, after non-process stuff has been done */ |
f0c3b509 | 3153 | int proc_pid_readdir(struct file *file, struct dir_context *ctx) |
1da177e4 | 3154 | { |
19fd4bb2 | 3155 | struct tgid_iter iter; |
3aa3377f | 3156 | struct pid_namespace *ns = file_inode(file)->i_sb->s_fs_info; |
f0c3b509 | 3157 | loff_t pos = ctx->pos; |
1da177e4 | 3158 | |
021ada7d | 3159 | if (pos >= PID_MAX_LIMIT + TGID_OFFSET) |
f0c3b509 | 3160 | return 0; |
1da177e4 | 3161 | |
0097875b | 3162 | if (pos == TGID_OFFSET - 2) { |
2b0143b5 | 3163 | struct inode *inode = d_inode(ns->proc_self); |
db963164 | 3164 | if (!dir_emit(ctx, "self", 4, inode->i_ino, DT_LNK)) |
f0c3b509 | 3165 | return 0; |
0097875b EB |
3166 | ctx->pos = pos = pos + 1; |
3167 | } | |
3168 | if (pos == TGID_OFFSET - 1) { | |
2b0143b5 | 3169 | struct inode *inode = d_inode(ns->proc_thread_self); |
0097875b EB |
3170 | if (!dir_emit(ctx, "thread-self", 11, inode->i_ino, DT_LNK)) |
3171 | return 0; | |
3172 | ctx->pos = pos = pos + 1; | |
021ada7d | 3173 | } |
0097875b | 3174 | iter.tgid = pos - TGID_OFFSET; |
19fd4bb2 | 3175 | iter.task = NULL; |
19fd4bb2 EB |
3176 | for (iter = next_tgid(ns, iter); |
3177 | iter.task; | |
3178 | iter.tgid += 1, iter = next_tgid(ns, iter)) { | |
f0c3b509 AV |
3179 | char name[PROC_NUMBUF]; |
3180 | int len; | |
3181 | if (!has_pid_permissions(ns, iter.task, 2)) | |
3182 | continue; | |
0499680a | 3183 | |
f0c3b509 AV |
3184 | len = snprintf(name, sizeof(name), "%d", iter.tgid); |
3185 | ctx->pos = iter.tgid + TGID_OFFSET; | |
3186 | if (!proc_fill_cache(file, ctx, name, len, | |
3187 | proc_pid_instantiate, iter.task, NULL)) { | |
19fd4bb2 | 3188 | put_task_struct(iter.task); |
f0c3b509 | 3189 | return 0; |
1da177e4 | 3190 | } |
0bc58a91 | 3191 | } |
f0c3b509 | 3192 | ctx->pos = PID_MAX_LIMIT + TGID_OFFSET; |
0bc58a91 EB |
3193 | return 0; |
3194 | } | |
1da177e4 | 3195 | |
1b3044e3 JD |
3196 | /* |
3197 | * proc_tid_comm_permission is a special permission function exclusively | |
3198 | * used for the node /proc/<pid>/task/<tid>/comm. | |
3199 | * It bypasses generic permission checks in the case where a task of the same | |
3200 | * task group attempts to access the node. | |
3201 | * The rationale behind this is that glibc and bionic access this node for | |
3202 | * cross thread naming (pthread_set/getname_np(!self)). However, if | |
3203 | * PR_SET_DUMPABLE gets set to 0 this node among others becomes uid=0 gid=0, | |
3204 | * which locks out the cross thread naming implementation. | |
3205 | * This function makes sure that the node is always accessible for members of | |
3206 | * same thread group. | |
3207 | */ | |
3208 | static int proc_tid_comm_permission(struct inode *inode, int mask) | |
3209 | { | |
3210 | bool is_same_tgroup; | |
3211 | struct task_struct *task; | |
3212 | ||
3213 | task = get_proc_task(inode); | |
3214 | if (!task) | |
3215 | return -ESRCH; | |
3216 | is_same_tgroup = same_thread_group(current, task); | |
3217 | put_task_struct(task); | |
3218 | ||
3219 | if (likely(is_same_tgroup && !(mask & MAY_EXEC))) { | |
3220 | /* This file (/proc/<pid>/task/<tid>/comm) can always be | |
3221 | * read or written by the members of the corresponding | |
3222 | * thread group. | |
3223 | */ | |
3224 | return 0; | |
3225 | } | |
3226 | ||
3227 | return generic_permission(inode, mask); | |
3228 | } | |
3229 | ||
3230 | static const struct inode_operations proc_tid_comm_inode_operations = { | |
3231 | .permission = proc_tid_comm_permission, | |
3232 | }; | |
3233 | ||
28a6d671 EB |
3234 | /* |
3235 | * Tasks | |
3236 | */ | |
c5141e6d | 3237 | static const struct pid_entry tid_base_stuff[] = { |
631f9c18 | 3238 | DIR("fd", S_IRUSR|S_IXUSR, proc_fd_inode_operations, proc_fd_operations), |
3835541d | 3239 | DIR("fdinfo", S_IRUSR|S_IXUSR, proc_fdinfo_inode_operations, proc_fdinfo_operations), |
6b4e306a | 3240 | DIR("ns", S_IRUSR|S_IXUGO, proc_ns_dir_inode_operations, proc_ns_dir_operations), |
6ba8ed79 EB |
3241 | #ifdef CONFIG_NET |
3242 | DIR("net", S_IRUGO|S_IXUGO, proc_net_inode_operations, proc_net_operations), | |
3243 | #endif | |
631f9c18 | 3244 | REG("environ", S_IRUSR, proc_environ_operations), |
c5317167 | 3245 | REG("auxv", S_IRUSR, proc_auxv_operations), |
631f9c18 | 3246 | ONE("status", S_IRUGO, proc_pid_status), |
35a35046 | 3247 | ONE("personality", S_IRUSR, proc_pid_personality), |
1c963eb1 | 3248 | ONE("limits", S_IRUGO, proc_pid_limits), |
43ae34cb | 3249 | #ifdef CONFIG_SCHED_DEBUG |
631f9c18 | 3250 | REG("sched", S_IRUGO|S_IWUSR, proc_pid_sched_operations), |
ebcb6734 | 3251 | #endif |
1b3044e3 JD |
3252 | NOD("comm", S_IFREG|S_IRUGO|S_IWUSR, |
3253 | &proc_tid_comm_inode_operations, | |
3254 | &proc_pid_set_comm_operations, {}), | |
ebcb6734 | 3255 | #ifdef CONFIG_HAVE_ARCH_TRACEHOOK |
09d93bd6 | 3256 | ONE("syscall", S_IRUSR, proc_pid_syscall), |
43ae34cb | 3257 | #endif |
c2c0bb44 | 3258 | REG("cmdline", S_IRUGO, proc_pid_cmdline_ops), |
631f9c18 AD |
3259 | ONE("stat", S_IRUGO, proc_tid_stat), |
3260 | ONE("statm", S_IRUGO, proc_pid_statm), | |
b7643757 | 3261 | REG("maps", S_IRUGO, proc_tid_maps_operations), |
2e13ba54 | 3262 | #ifdef CONFIG_PROC_CHILDREN |
81841161 CG |
3263 | REG("children", S_IRUGO, proc_tid_children_operations), |
3264 | #endif | |
28a6d671 | 3265 | #ifdef CONFIG_NUMA |
b7643757 | 3266 | REG("numa_maps", S_IRUGO, proc_tid_numa_maps_operations), |
28a6d671 | 3267 | #endif |
631f9c18 AD |
3268 | REG("mem", S_IRUSR|S_IWUSR, proc_mem_operations), |
3269 | LNK("cwd", proc_cwd_link), | |
3270 | LNK("root", proc_root_link), | |
3271 | LNK("exe", proc_exe_link), | |
3272 | REG("mounts", S_IRUGO, proc_mounts_operations), | |
3273 | REG("mountinfo", S_IRUGO, proc_mountinfo_operations), | |
1e883281 | 3274 | #ifdef CONFIG_PROC_PAGE_MONITOR |
631f9c18 | 3275 | REG("clear_refs", S_IWUSR, proc_clear_refs_operations), |
b7643757 | 3276 | REG("smaps", S_IRUGO, proc_tid_smaps_operations), |
32ed74a4 | 3277 | REG("pagemap", S_IRUSR, proc_pagemap_operations), |
28a6d671 EB |
3278 | #endif |
3279 | #ifdef CONFIG_SECURITY | |
631f9c18 | 3280 | DIR("attr", S_IRUGO|S_IXUGO, proc_attr_dir_inode_operations, proc_attr_dir_operations), |
28a6d671 EB |
3281 | #endif |
3282 | #ifdef CONFIG_KALLSYMS | |
edfcd606 | 3283 | ONE("wchan", S_IRUGO, proc_pid_wchan), |
28a6d671 | 3284 | #endif |
2ec220e2 | 3285 | #ifdef CONFIG_STACKTRACE |
35a35046 | 3286 | ONE("stack", S_IRUSR, proc_pid_stack), |
28a6d671 | 3287 | #endif |
5968cece | 3288 | #ifdef CONFIG_SCHED_INFO |
f6e826ca | 3289 | ONE("schedstat", S_IRUGO, proc_pid_schedstat), |
28a6d671 | 3290 | #endif |
9745512c | 3291 | #ifdef CONFIG_LATENCYTOP |
631f9c18 | 3292 | REG("latency", S_IRUGO, proc_lstats_operations), |
9745512c | 3293 | #endif |
8793d854 | 3294 | #ifdef CONFIG_PROC_PID_CPUSET |
52de4779 | 3295 | ONE("cpuset", S_IRUGO, proc_cpuset_show), |
a424316c PM |
3296 | #endif |
3297 | #ifdef CONFIG_CGROUPS | |
006f4ac4 | 3298 | ONE("cgroup", S_IRUGO, proc_cgroup_show), |
28a6d671 | 3299 | #endif |
6ba51e37 | 3300 | ONE("oom_score", S_IRUGO, proc_oom_score), |
fa0cbbf1 | 3301 | REG("oom_adj", S_IRUGO|S_IWUSR, proc_oom_adj_operations), |
a63d83f4 | 3302 | REG("oom_score_adj", S_IRUGO|S_IWUSR, proc_oom_score_adj_operations), |
28a6d671 | 3303 | #ifdef CONFIG_AUDITSYSCALL |
631f9c18 | 3304 | REG("loginuid", S_IWUSR|S_IRUGO, proc_loginuid_operations), |
26ec3c64 | 3305 | REG("sessionid", S_IRUGO, proc_sessionid_operations), |
28a6d671 | 3306 | #endif |
f4f154fd | 3307 | #ifdef CONFIG_FAULT_INJECTION |
631f9c18 | 3308 | REG("make-it-fail", S_IRUGO|S_IWUSR, proc_fault_inject_operations), |
f4f154fd | 3309 | #endif |
297c5d92 | 3310 | #ifdef CONFIG_TASK_IO_ACCOUNTING |
19aadc98 | 3311 | ONE("io", S_IRUSR, proc_tid_io_accounting), |
297c5d92 | 3312 | #endif |
f133ecca | 3313 | #ifdef CONFIG_HARDWALL |
d962c144 | 3314 | ONE("hardwall", S_IRUGO, proc_pid_hardwall), |
f133ecca | 3315 | #endif |
22d917d8 EB |
3316 | #ifdef CONFIG_USER_NS |
3317 | REG("uid_map", S_IRUGO|S_IWUSR, proc_uid_map_operations), | |
3318 | REG("gid_map", S_IRUGO|S_IWUSR, proc_gid_map_operations), | |
f76d207a | 3319 | REG("projid_map", S_IRUGO|S_IWUSR, proc_projid_map_operations), |
9cc46516 | 3320 | REG("setgroups", S_IRUGO|S_IWUSR, proc_setgroups_operations), |
22d917d8 | 3321 | #endif |
28a6d671 EB |
3322 | }; |
3323 | ||
f0c3b509 | 3324 | static int proc_tid_base_readdir(struct file *file, struct dir_context *ctx) |
28a6d671 | 3325 | { |
f0c3b509 AV |
3326 | return proc_pident_readdir(file, ctx, |
3327 | tid_base_stuff, ARRAY_SIZE(tid_base_stuff)); | |
28a6d671 EB |
3328 | } |
3329 | ||
00cd8dd3 AV |
3330 | static struct dentry *proc_tid_base_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags) |
3331 | { | |
7bcd6b0e EB |
3332 | return proc_pident_lookup(dir, dentry, |
3333 | tid_base_stuff, ARRAY_SIZE(tid_base_stuff)); | |
28a6d671 EB |
3334 | } |
3335 | ||
00977a59 | 3336 | static const struct file_operations proc_tid_base_operations = { |
28a6d671 | 3337 | .read = generic_read_dir, |
f50752ea AV |
3338 | .iterate_shared = proc_tid_base_readdir, |
3339 | .llseek = generic_file_llseek, | |
28a6d671 EB |
3340 | }; |
3341 | ||
c5ef1c42 | 3342 | static const struct inode_operations proc_tid_base_inode_operations = { |
28a6d671 EB |
3343 | .lookup = proc_tid_base_lookup, |
3344 | .getattr = pid_getattr, | |
3345 | .setattr = proc_setattr, | |
3346 | }; | |
3347 | ||
c52a47ac | 3348 | static int proc_task_instantiate(struct inode *dir, |
c5141e6d | 3349 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
444ceed8 | 3350 | { |
444ceed8 | 3351 | struct inode *inode; |
61a28784 | 3352 | inode = proc_pid_make_inode(dir->i_sb, task); |
444ceed8 EB |
3353 | |
3354 | if (!inode) | |
3355 | goto out; | |
3356 | inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO; | |
3357 | inode->i_op = &proc_tid_base_inode_operations; | |
3358 | inode->i_fop = &proc_tid_base_operations; | |
3359 | inode->i_flags|=S_IMMUTABLE; | |
aed54175 | 3360 | |
bfe86848 MS |
3361 | set_nlink(inode, 2 + pid_entry_count_dirs(tid_base_stuff, |
3362 | ARRAY_SIZE(tid_base_stuff))); | |
444ceed8 | 3363 | |
fb045adb | 3364 | d_set_d_op(dentry, &pid_dentry_operations); |
444ceed8 EB |
3365 | |
3366 | d_add(dentry, inode); | |
3367 | /* Close the race of the process dying before we return the dentry */ | |
0b728e19 | 3368 | if (pid_revalidate(dentry, 0)) |
c52a47ac | 3369 | return 0; |
444ceed8 | 3370 | out: |
c52a47ac | 3371 | return -ENOENT; |
444ceed8 EB |
3372 | } |
3373 | ||
00cd8dd3 | 3374 | static struct dentry *proc_task_lookup(struct inode *dir, struct dentry * dentry, unsigned int flags) |
28a6d671 | 3375 | { |
c52a47ac | 3376 | int result = -ENOENT; |
28a6d671 EB |
3377 | struct task_struct *task; |
3378 | struct task_struct *leader = get_proc_task(dir); | |
28a6d671 | 3379 | unsigned tid; |
b488893a | 3380 | struct pid_namespace *ns; |
28a6d671 EB |
3381 | |
3382 | if (!leader) | |
3383 | goto out_no_task; | |
3384 | ||
dbcdb504 | 3385 | tid = name_to_int(&dentry->d_name); |
28a6d671 EB |
3386 | if (tid == ~0U) |
3387 | goto out; | |
3388 | ||
b488893a | 3389 | ns = dentry->d_sb->s_fs_info; |
28a6d671 | 3390 | rcu_read_lock(); |
b488893a | 3391 | task = find_task_by_pid_ns(tid, ns); |
28a6d671 EB |
3392 | if (task) |
3393 | get_task_struct(task); | |
3394 | rcu_read_unlock(); | |
3395 | if (!task) | |
3396 | goto out; | |
bac0abd6 | 3397 | if (!same_thread_group(leader, task)) |
28a6d671 EB |
3398 | goto out_drop_task; |
3399 | ||
444ceed8 | 3400 | result = proc_task_instantiate(dir, dentry, task, NULL); |
28a6d671 EB |
3401 | out_drop_task: |
3402 | put_task_struct(task); | |
3403 | out: | |
3404 | put_task_struct(leader); | |
3405 | out_no_task: | |
c52a47ac | 3406 | return ERR_PTR(result); |
28a6d671 EB |
3407 | } |
3408 | ||
0bc58a91 EB |
3409 | /* |
3410 | * Find the first tid of a thread group to return to user space. | |
3411 | * | |
3412 | * Usually this is just the thread group leader, but if the users | |
3413 | * buffer was too small or there was a seek into the middle of the | |
3414 | * directory we have more work todo. | |
3415 | * | |
3416 | * In the case of a short read we start with find_task_by_pid. | |
3417 | * | |
3418 | * In the case of a seek we start with the leader and walk nr | |
3419 | * threads past it. | |
3420 | */ | |
9f6e963f ON |
3421 | static struct task_struct *first_tid(struct pid *pid, int tid, loff_t f_pos, |
3422 | struct pid_namespace *ns) | |
0bc58a91 | 3423 | { |
d855a4b7 | 3424 | struct task_struct *pos, *task; |
9f6e963f ON |
3425 | unsigned long nr = f_pos; |
3426 | ||
3427 | if (nr != f_pos) /* 32bit overflow? */ | |
3428 | return NULL; | |
1da177e4 | 3429 | |
cc288738 | 3430 | rcu_read_lock(); |
d855a4b7 ON |
3431 | task = pid_task(pid, PIDTYPE_PID); |
3432 | if (!task) | |
3433 | goto fail; | |
3434 | ||
3435 | /* Attempt to start with the tid of a thread */ | |
9f6e963f | 3436 | if (tid && nr) { |
b488893a | 3437 | pos = find_task_by_pid_ns(tid, ns); |
d855a4b7 | 3438 | if (pos && same_thread_group(pos, task)) |
a872ff0c | 3439 | goto found; |
0bc58a91 | 3440 | } |
1da177e4 | 3441 | |
0bc58a91 | 3442 | /* If nr exceeds the number of threads there is nothing todo */ |
9f6e963f | 3443 | if (nr >= get_nr_threads(task)) |
c986c14a | 3444 | goto fail; |
1da177e4 | 3445 | |
a872ff0c ON |
3446 | /* If we haven't found our starting place yet start |
3447 | * with the leader and walk nr threads forward. | |
0bc58a91 | 3448 | */ |
d855a4b7 | 3449 | pos = task = task->group_leader; |
c986c14a | 3450 | do { |
9f6e963f | 3451 | if (!nr--) |
c986c14a | 3452 | goto found; |
d855a4b7 | 3453 | } while_each_thread(task, pos); |
c986c14a ON |
3454 | fail: |
3455 | pos = NULL; | |
3456 | goto out; | |
a872ff0c ON |
3457 | found: |
3458 | get_task_struct(pos); | |
3459 | out: | |
cc288738 | 3460 | rcu_read_unlock(); |
0bc58a91 EB |
3461 | return pos; |
3462 | } | |
3463 | ||
3464 | /* | |
3465 | * Find the next thread in the thread list. | |
3466 | * Return NULL if there is an error or no next thread. | |
3467 | * | |
3468 | * The reference to the input task_struct is released. | |
3469 | */ | |
3470 | static struct task_struct *next_tid(struct task_struct *start) | |
3471 | { | |
c1df7fb8 | 3472 | struct task_struct *pos = NULL; |
cc288738 | 3473 | rcu_read_lock(); |
c1df7fb8 | 3474 | if (pid_alive(start)) { |
0bc58a91 | 3475 | pos = next_thread(start); |
c1df7fb8 ON |
3476 | if (thread_group_leader(pos)) |
3477 | pos = NULL; | |
3478 | else | |
3479 | get_task_struct(pos); | |
3480 | } | |
cc288738 | 3481 | rcu_read_unlock(); |
0bc58a91 EB |
3482 | put_task_struct(start); |
3483 | return pos; | |
1da177e4 LT |
3484 | } |
3485 | ||
3486 | /* for the /proc/TGID/task/ directories */ | |
f0c3b509 | 3487 | static int proc_task_readdir(struct file *file, struct dir_context *ctx) |
1da177e4 | 3488 | { |
d855a4b7 ON |
3489 | struct inode *inode = file_inode(file); |
3490 | struct task_struct *task; | |
b488893a | 3491 | struct pid_namespace *ns; |
f0c3b509 | 3492 | int tid; |
1da177e4 | 3493 | |
d855a4b7 | 3494 | if (proc_inode_is_dead(inode)) |
f0c3b509 | 3495 | return -ENOENT; |
1da177e4 | 3496 | |
f0c3b509 | 3497 | if (!dir_emit_dots(file, ctx)) |
d855a4b7 | 3498 | return 0; |
1da177e4 | 3499 | |
0bc58a91 EB |
3500 | /* f_version caches the tgid value that the last readdir call couldn't |
3501 | * return. lseek aka telldir automagically resets f_version to 0. | |
3502 | */ | |
3aa3377f | 3503 | ns = inode->i_sb->s_fs_info; |
f0c3b509 AV |
3504 | tid = (int)file->f_version; |
3505 | file->f_version = 0; | |
d855a4b7 | 3506 | for (task = first_tid(proc_pid(inode), tid, ctx->pos - 2, ns); |
0bc58a91 | 3507 | task; |
f0c3b509 AV |
3508 | task = next_tid(task), ctx->pos++) { |
3509 | char name[PROC_NUMBUF]; | |
3510 | int len; | |
b488893a | 3511 | tid = task_pid_nr_ns(task, ns); |
f0c3b509 AV |
3512 | len = snprintf(name, sizeof(name), "%d", tid); |
3513 | if (!proc_fill_cache(file, ctx, name, len, | |
3514 | proc_task_instantiate, task, NULL)) { | |
0bc58a91 EB |
3515 | /* returning this tgid failed, save it as the first |
3516 | * pid for the next readir call */ | |
f0c3b509 | 3517 | file->f_version = (u64)tid; |
0bc58a91 | 3518 | put_task_struct(task); |
1da177e4 | 3519 | break; |
0bc58a91 | 3520 | } |
1da177e4 | 3521 | } |
d855a4b7 | 3522 | |
f0c3b509 | 3523 | return 0; |
1da177e4 | 3524 | } |
6e66b52b EB |
3525 | |
3526 | static int proc_task_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) | |
3527 | { | |
2b0143b5 | 3528 | struct inode *inode = d_inode(dentry); |
99f89551 | 3529 | struct task_struct *p = get_proc_task(inode); |
6e66b52b EB |
3530 | generic_fillattr(inode, stat); |
3531 | ||
99f89551 | 3532 | if (p) { |
99f89551 | 3533 | stat->nlink += get_nr_threads(p); |
99f89551 | 3534 | put_task_struct(p); |
6e66b52b EB |
3535 | } |
3536 | ||
3537 | return 0; | |
3538 | } | |
28a6d671 | 3539 | |
c5ef1c42 | 3540 | static const struct inode_operations proc_task_inode_operations = { |
28a6d671 EB |
3541 | .lookup = proc_task_lookup, |
3542 | .getattr = proc_task_getattr, | |
3543 | .setattr = proc_setattr, | |
0499680a | 3544 | .permission = proc_pid_permission, |
28a6d671 EB |
3545 | }; |
3546 | ||
00977a59 | 3547 | static const struct file_operations proc_task_operations = { |
28a6d671 | 3548 | .read = generic_read_dir, |
f50752ea AV |
3549 | .iterate_shared = proc_task_readdir, |
3550 | .llseek = generic_file_llseek, | |
28a6d671 | 3551 | }; |