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 | ||
7c0f6ba6 | 50 | #include <linux/uaccess.h> |
1da177e4 | 51 | |
1da177e4 LT |
52 | #include <linux/errno.h> |
53 | #include <linux/time.h> | |
54 | #include <linux/proc_fs.h> | |
55 | #include <linux/stat.h> | |
5995477a | 56 | #include <linux/task_io_accounting_ops.h> |
1da177e4 | 57 | #include <linux/init.h> |
16f7e0fe | 58 | #include <linux/capability.h> |
1da177e4 | 59 | #include <linux/file.h> |
9f3acc31 | 60 | #include <linux/fdtable.h> |
1da177e4 LT |
61 | #include <linux/string.h> |
62 | #include <linux/seq_file.h> | |
63 | #include <linux/namei.h> | |
6b3286ed | 64 | #include <linux/mnt_namespace.h> |
1da177e4 | 65 | #include <linux/mm.h> |
a63d83f4 | 66 | #include <linux/swap.h> |
b835996f | 67 | #include <linux/rcupdate.h> |
1da177e4 | 68 | #include <linux/kallsyms.h> |
2ec220e2 | 69 | #include <linux/stacktrace.h> |
d85f50d5 | 70 | #include <linux/resource.h> |
5096add8 | 71 | #include <linux/module.h> |
1da177e4 LT |
72 | #include <linux/mount.h> |
73 | #include <linux/security.h> | |
74 | #include <linux/ptrace.h> | |
0d094efe | 75 | #include <linux/tracehook.h> |
87ebdc00 | 76 | #include <linux/printk.h> |
a424316c | 77 | #include <linux/cgroup.h> |
1da177e4 LT |
78 | #include <linux/cpuset.h> |
79 | #include <linux/audit.h> | |
5addc5dd | 80 | #include <linux/poll.h> |
1651e14e | 81 | #include <linux/nsproxy.h> |
8ac773b4 | 82 | #include <linux/oom.h> |
3cb4a0bb | 83 | #include <linux/elf.h> |
60347f67 | 84 | #include <linux/pid_namespace.h> |
22d917d8 | 85 | #include <linux/user_namespace.h> |
5ad4e53b | 86 | #include <linux/fs_struct.h> |
5a0e3ad6 | 87 | #include <linux/slab.h> |
4eb5aaa3 | 88 | #include <linux/sched/autogroup.h> |
6e84f315 | 89 | #include <linux/sched/mm.h> |
f7ccbae4 | 90 | #include <linux/sched/coredump.h> |
b17b0153 | 91 | #include <linux/sched/debug.h> |
3905f9ad | 92 | #include <linux/sched/stat.h> |
640708a2 | 93 | #include <linux/flex_array.h> |
48f6a7a5 | 94 | #include <linux/posix-timers.h> |
f133ecca CM |
95 | #ifdef CONFIG_HARDWALL |
96 | #include <asm/hardwall.h> | |
97 | #endif | |
43d2b113 | 98 | #include <trace/events/oom.h> |
1da177e4 | 99 | #include "internal.h" |
faf60af1 | 100 | #include "fd.h" |
1da177e4 | 101 | |
0f2fe20f EB |
102 | /* NOTE: |
103 | * Implementing inode permission operations in /proc is almost | |
104 | * certainly an error. Permission checks need to happen during | |
105 | * each system call not at open time. The reason is that most of | |
106 | * what we wish to check for permissions in /proc varies at runtime. | |
107 | * | |
108 | * The classic example of a problem is opening file descriptors | |
109 | * in /proc for a task before it execs a suid executable. | |
110 | */ | |
111 | ||
1270dd8d AD |
112 | static u8 nlink_tid; |
113 | static u8 nlink_tgid; | |
114 | ||
1da177e4 | 115 | struct pid_entry { |
cedbccab | 116 | const char *name; |
623f594e | 117 | unsigned int len; |
d161a13f | 118 | umode_t mode; |
c5ef1c42 | 119 | const struct inode_operations *iop; |
00977a59 | 120 | const struct file_operations *fop; |
20cdc894 | 121 | union proc_op op; |
1da177e4 LT |
122 | }; |
123 | ||
61a28784 | 124 | #define NOD(NAME, MODE, IOP, FOP, OP) { \ |
20cdc894 | 125 | .name = (NAME), \ |
c5141e6d | 126 | .len = sizeof(NAME) - 1, \ |
20cdc894 EB |
127 | .mode = MODE, \ |
128 | .iop = IOP, \ | |
129 | .fop = FOP, \ | |
130 | .op = OP, \ | |
131 | } | |
132 | ||
631f9c18 AD |
133 | #define DIR(NAME, MODE, iops, fops) \ |
134 | NOD(NAME, (S_IFDIR|(MODE)), &iops, &fops, {} ) | |
135 | #define LNK(NAME, get_link) \ | |
61a28784 | 136 | NOD(NAME, (S_IFLNK|S_IRWXUGO), \ |
20cdc894 | 137 | &proc_pid_link_inode_operations, NULL, \ |
631f9c18 AD |
138 | { .proc_get_link = get_link } ) |
139 | #define REG(NAME, MODE, fops) \ | |
140 | NOD(NAME, (S_IFREG|(MODE)), NULL, &fops, {}) | |
631f9c18 | 141 | #define ONE(NAME, MODE, show) \ |
be614086 EB |
142 | NOD(NAME, (S_IFREG|(MODE)), \ |
143 | NULL, &proc_single_file_operations, \ | |
631f9c18 | 144 | { .proc_show = show } ) |
1da177e4 | 145 | |
aed54175 VN |
146 | /* |
147 | * Count the number of hardlinks for the pid_entry table, excluding the . | |
148 | * and .. links. | |
149 | */ | |
1270dd8d | 150 | static unsigned int __init pid_entry_nlink(const struct pid_entry *entries, |
aed54175 VN |
151 | unsigned int n) |
152 | { | |
153 | unsigned int i; | |
154 | unsigned int count; | |
155 | ||
1270dd8d | 156 | count = 2; |
aed54175 VN |
157 | for (i = 0; i < n; ++i) { |
158 | if (S_ISDIR(entries[i].mode)) | |
159 | ++count; | |
160 | } | |
161 | ||
162 | return count; | |
163 | } | |
164 | ||
f7ad3c6b | 165 | static int get_task_root(struct task_struct *task, struct path *root) |
1da177e4 | 166 | { |
7c2c7d99 HD |
167 | int result = -ENOENT; |
168 | ||
0494f6ec | 169 | task_lock(task); |
f7ad3c6b MS |
170 | if (task->fs) { |
171 | get_fs_root(task->fs, root); | |
7c2c7d99 HD |
172 | result = 0; |
173 | } | |
0494f6ec | 174 | task_unlock(task); |
7c2c7d99 | 175 | return result; |
0494f6ec MS |
176 | } |
177 | ||
7773fbc5 | 178 | static int proc_cwd_link(struct dentry *dentry, struct path *path) |
0494f6ec | 179 | { |
2b0143b5 | 180 | struct task_struct *task = get_proc_task(d_inode(dentry)); |
0494f6ec | 181 | int result = -ENOENT; |
99f89551 EB |
182 | |
183 | if (task) { | |
f7ad3c6b MS |
184 | task_lock(task); |
185 | if (task->fs) { | |
186 | get_fs_pwd(task->fs, path); | |
187 | result = 0; | |
188 | } | |
189 | task_unlock(task); | |
99f89551 EB |
190 | put_task_struct(task); |
191 | } | |
1da177e4 LT |
192 | return result; |
193 | } | |
194 | ||
7773fbc5 | 195 | static int proc_root_link(struct dentry *dentry, struct path *path) |
1da177e4 | 196 | { |
2b0143b5 | 197 | struct task_struct *task = get_proc_task(d_inode(dentry)); |
1da177e4 | 198 | int result = -ENOENT; |
99f89551 EB |
199 | |
200 | if (task) { | |
f7ad3c6b | 201 | result = get_task_root(task, path); |
99f89551 EB |
202 | put_task_struct(task); |
203 | } | |
1da177e4 LT |
204 | return result; |
205 | } | |
206 | ||
c2c0bb44 AD |
207 | static ssize_t proc_pid_cmdline_read(struct file *file, char __user *buf, |
208 | size_t _count, loff_t *pos) | |
1da177e4 | 209 | { |
c2c0bb44 AD |
210 | struct task_struct *tsk; |
211 | struct mm_struct *mm; | |
212 | char *page; | |
213 | unsigned long count = _count; | |
214 | unsigned long arg_start, arg_end, env_start, env_end; | |
215 | unsigned long len1, len2, len; | |
216 | unsigned long p; | |
217 | char c; | |
218 | ssize_t rv; | |
219 | ||
220 | BUG_ON(*pos < 0); | |
221 | ||
222 | tsk = get_proc_task(file_inode(file)); | |
223 | if (!tsk) | |
224 | return -ESRCH; | |
225 | mm = get_task_mm(tsk); | |
226 | put_task_struct(tsk); | |
227 | if (!mm) | |
228 | return 0; | |
229 | /* Check if process spawned far enough to have cmdline. */ | |
230 | if (!mm->env_end) { | |
231 | rv = 0; | |
232 | goto out_mmput; | |
233 | } | |
234 | ||
235 | page = (char *)__get_free_page(GFP_TEMPORARY); | |
236 | if (!page) { | |
237 | rv = -ENOMEM; | |
238 | goto out_mmput; | |
239 | } | |
240 | ||
241 | down_read(&mm->mmap_sem); | |
242 | arg_start = mm->arg_start; | |
243 | arg_end = mm->arg_end; | |
244 | env_start = mm->env_start; | |
245 | env_end = mm->env_end; | |
246 | up_read(&mm->mmap_sem); | |
247 | ||
248 | BUG_ON(arg_start > arg_end); | |
249 | BUG_ON(env_start > env_end); | |
250 | ||
251 | len1 = arg_end - arg_start; | |
252 | len2 = env_end - env_start; | |
253 | ||
3581d458 AD |
254 | /* Empty ARGV. */ |
255 | if (len1 == 0) { | |
256 | rv = 0; | |
257 | goto out_free_page; | |
258 | } | |
2ca66ff7 | 259 | /* |
c2c0bb44 AD |
260 | * Inherently racy -- command line shares address space |
261 | * with code and data. | |
2ca66ff7 | 262 | */ |
272ddc8b | 263 | rv = access_remote_vm(mm, arg_end - 1, &c, 1, 0); |
c2c0bb44 AD |
264 | if (rv <= 0) |
265 | goto out_free_page; | |
266 | ||
267 | rv = 0; | |
268 | ||
269 | if (c == '\0') { | |
270 | /* Command line (set of strings) occupies whole ARGV. */ | |
271 | if (len1 <= *pos) | |
272 | goto out_free_page; | |
273 | ||
274 | p = arg_start + *pos; | |
275 | len = len1 - *pos; | |
276 | while (count > 0 && len > 0) { | |
277 | unsigned int _count; | |
278 | int nr_read; | |
279 | ||
280 | _count = min3(count, len, PAGE_SIZE); | |
272ddc8b | 281 | nr_read = access_remote_vm(mm, p, page, _count, 0); |
c2c0bb44 AD |
282 | if (nr_read < 0) |
283 | rv = nr_read; | |
284 | if (nr_read <= 0) | |
285 | goto out_free_page; | |
286 | ||
287 | if (copy_to_user(buf, page, nr_read)) { | |
288 | rv = -EFAULT; | |
289 | goto out_free_page; | |
290 | } | |
291 | ||
292 | p += nr_read; | |
293 | len -= nr_read; | |
294 | buf += nr_read; | |
295 | count -= nr_read; | |
296 | rv += nr_read; | |
297 | } | |
298 | } else { | |
c2c0bb44 AD |
299 | /* |
300 | * Command line (1 string) occupies ARGV and | |
301 | * extends into ENVP. | |
302 | */ | |
a0a07b87 AD |
303 | struct { |
304 | unsigned long p; | |
305 | unsigned long len; | |
306 | } cmdline[2] = { | |
307 | { .p = arg_start, .len = len1 }, | |
308 | { .p = env_start, .len = len2 }, | |
309 | }; | |
310 | loff_t pos1 = *pos; | |
311 | unsigned int i; | |
312 | ||
313 | i = 0; | |
314 | while (i < 2 && pos1 >= cmdline[i].len) { | |
315 | pos1 -= cmdline[i].len; | |
316 | i++; | |
c2c0bb44 | 317 | } |
a0a07b87 AD |
318 | while (i < 2) { |
319 | p = cmdline[i].p + pos1; | |
320 | len = cmdline[i].len - pos1; | |
321 | while (count > 0 && len > 0) { | |
322 | unsigned int _count, l; | |
323 | int nr_read; | |
324 | bool final; | |
325 | ||
326 | _count = min3(count, len, PAGE_SIZE); | |
327 | nr_read = access_remote_vm(mm, p, page, _count, 0); | |
328 | if (nr_read < 0) | |
329 | rv = nr_read; | |
330 | if (nr_read <= 0) | |
331 | goto out_free_page; | |
332 | ||
333 | /* | |
334 | * Command line can be shorter than whole ARGV | |
335 | * even if last "marker" byte says it is not. | |
336 | */ | |
337 | final = false; | |
338 | l = strnlen(page, nr_read); | |
339 | if (l < nr_read) { | |
340 | nr_read = l; | |
341 | final = true; | |
342 | } | |
343 | ||
344 | if (copy_to_user(buf, page, nr_read)) { | |
345 | rv = -EFAULT; | |
346 | goto out_free_page; | |
347 | } | |
348 | ||
349 | p += nr_read; | |
350 | len -= nr_read; | |
351 | buf += nr_read; | |
352 | count -= nr_read; | |
353 | rv += nr_read; | |
354 | ||
355 | if (final) | |
356 | goto out_free_page; | |
c2c0bb44 AD |
357 | } |
358 | ||
a0a07b87 AD |
359 | /* Only first chunk can be read partially. */ |
360 | pos1 = 0; | |
361 | i++; | |
c2c0bb44 | 362 | } |
c2c0bb44 AD |
363 | } |
364 | ||
365 | out_free_page: | |
366 | free_page((unsigned long)page); | |
367 | out_mmput: | |
368 | mmput(mm); | |
369 | if (rv > 0) | |
370 | *pos += rv; | |
371 | return rv; | |
1da177e4 LT |
372 | } |
373 | ||
c2c0bb44 AD |
374 | static const struct file_operations proc_pid_cmdline_ops = { |
375 | .read = proc_pid_cmdline_read, | |
376 | .llseek = generic_file_llseek, | |
377 | }; | |
378 | ||
1da177e4 LT |
379 | #ifdef CONFIG_KALLSYMS |
380 | /* | |
381 | * Provides a wchan file via kallsyms in a proper one-value-per-file format. | |
382 | * Returns the resolved symbol. If that fails, simply return the address. | |
383 | */ | |
edfcd606 AD |
384 | static int proc_pid_wchan(struct seq_file *m, struct pid_namespace *ns, |
385 | struct pid *pid, struct task_struct *task) | |
1da177e4 | 386 | { |
ffb45122 | 387 | unsigned long wchan; |
9281acea | 388 | char symname[KSYM_NAME_LEN]; |
1da177e4 LT |
389 | |
390 | wchan = get_wchan(task); | |
391 | ||
caaee623 JH |
392 | if (wchan && ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS) |
393 | && !lookup_symbol_name(wchan, symname)) | |
25ce3191 | 394 | seq_printf(m, "%s", symname); |
b2f73922 | 395 | else |
1e92a61c | 396 | seq_putc(m, '0'); |
25ce3191 JP |
397 | |
398 | return 0; | |
1da177e4 LT |
399 | } |
400 | #endif /* CONFIG_KALLSYMS */ | |
401 | ||
a9712bc1 AV |
402 | static int lock_trace(struct task_struct *task) |
403 | { | |
404 | int err = mutex_lock_killable(&task->signal->cred_guard_mutex); | |
405 | if (err) | |
406 | return err; | |
caaee623 | 407 | if (!ptrace_may_access(task, PTRACE_MODE_ATTACH_FSCREDS)) { |
a9712bc1 AV |
408 | mutex_unlock(&task->signal->cred_guard_mutex); |
409 | return -EPERM; | |
410 | } | |
411 | return 0; | |
412 | } | |
413 | ||
414 | static void unlock_trace(struct task_struct *task) | |
415 | { | |
416 | mutex_unlock(&task->signal->cred_guard_mutex); | |
417 | } | |
418 | ||
2ec220e2 KC |
419 | #ifdef CONFIG_STACKTRACE |
420 | ||
421 | #define MAX_STACK_TRACE_DEPTH 64 | |
422 | ||
423 | static int proc_pid_stack(struct seq_file *m, struct pid_namespace *ns, | |
424 | struct pid *pid, struct task_struct *task) | |
425 | { | |
426 | struct stack_trace trace; | |
427 | unsigned long *entries; | |
a9712bc1 | 428 | int err; |
2ec220e2 KC |
429 | int i; |
430 | ||
431 | entries = kmalloc(MAX_STACK_TRACE_DEPTH * sizeof(*entries), GFP_KERNEL); | |
432 | if (!entries) | |
433 | return -ENOMEM; | |
434 | ||
435 | trace.nr_entries = 0; | |
436 | trace.max_entries = MAX_STACK_TRACE_DEPTH; | |
437 | trace.entries = entries; | |
438 | trace.skip = 0; | |
2ec220e2 | 439 | |
a9712bc1 AV |
440 | err = lock_trace(task); |
441 | if (!err) { | |
442 | save_stack_trace_tsk(task, &trace); | |
443 | ||
444 | for (i = 0; i < trace.nr_entries; i++) { | |
8b927d73 | 445 | seq_printf(m, "[<%pK>] %pB\n", |
a9712bc1 AV |
446 | (void *)entries[i], (void *)entries[i]); |
447 | } | |
448 | unlock_trace(task); | |
2ec220e2 KC |
449 | } |
450 | kfree(entries); | |
451 | ||
a9712bc1 | 452 | return err; |
2ec220e2 KC |
453 | } |
454 | #endif | |
455 | ||
5968cece | 456 | #ifdef CONFIG_SCHED_INFO |
1da177e4 LT |
457 | /* |
458 | * Provides /proc/PID/schedstat | |
459 | */ | |
f6e826ca AD |
460 | static int proc_pid_schedstat(struct seq_file *m, struct pid_namespace *ns, |
461 | struct pid *pid, struct task_struct *task) | |
1da177e4 | 462 | { |
5968cece NR |
463 | if (unlikely(!sched_info_on())) |
464 | seq_printf(m, "0 0 0\n"); | |
465 | else | |
466 | seq_printf(m, "%llu %llu %lu\n", | |
25ce3191 JP |
467 | (unsigned long long)task->se.sum_exec_runtime, |
468 | (unsigned long long)task->sched_info.run_delay, | |
469 | task->sched_info.pcount); | |
470 | ||
471 | return 0; | |
1da177e4 LT |
472 | } |
473 | #endif | |
474 | ||
9745512c AV |
475 | #ifdef CONFIG_LATENCYTOP |
476 | static int lstats_show_proc(struct seq_file *m, void *v) | |
477 | { | |
478 | int i; | |
13d77c37 HS |
479 | struct inode *inode = m->private; |
480 | struct task_struct *task = get_proc_task(inode); | |
9745512c | 481 | |
13d77c37 HS |
482 | if (!task) |
483 | return -ESRCH; | |
484 | seq_puts(m, "Latency Top version : v0.1\n"); | |
9745512c | 485 | for (i = 0; i < 32; i++) { |
34e49d4f JP |
486 | struct latency_record *lr = &task->latency_record[i]; |
487 | if (lr->backtrace[0]) { | |
9745512c | 488 | int q; |
34e49d4f JP |
489 | seq_printf(m, "%i %li %li", |
490 | lr->count, lr->time, lr->max); | |
9745512c | 491 | for (q = 0; q < LT_BACKTRACEDEPTH; q++) { |
34e49d4f JP |
492 | unsigned long bt = lr->backtrace[q]; |
493 | if (!bt) | |
9745512c | 494 | break; |
34e49d4f | 495 | if (bt == ULONG_MAX) |
9745512c | 496 | break; |
34e49d4f | 497 | seq_printf(m, " %ps", (void *)bt); |
9745512c | 498 | } |
9d6de12f | 499 | seq_putc(m, '\n'); |
9745512c AV |
500 | } |
501 | ||
502 | } | |
13d77c37 | 503 | put_task_struct(task); |
9745512c AV |
504 | return 0; |
505 | } | |
506 | ||
507 | static int lstats_open(struct inode *inode, struct file *file) | |
508 | { | |
13d77c37 | 509 | return single_open(file, lstats_show_proc, inode); |
d6643d12 HS |
510 | } |
511 | ||
9745512c AV |
512 | static ssize_t lstats_write(struct file *file, const char __user *buf, |
513 | size_t count, loff_t *offs) | |
514 | { | |
496ad9aa | 515 | struct task_struct *task = get_proc_task(file_inode(file)); |
9745512c | 516 | |
13d77c37 HS |
517 | if (!task) |
518 | return -ESRCH; | |
9745512c | 519 | clear_all_latency_tracing(task); |
13d77c37 | 520 | put_task_struct(task); |
9745512c AV |
521 | |
522 | return count; | |
523 | } | |
524 | ||
525 | static const struct file_operations proc_lstats_operations = { | |
526 | .open = lstats_open, | |
527 | .read = seq_read, | |
528 | .write = lstats_write, | |
529 | .llseek = seq_lseek, | |
13d77c37 | 530 | .release = single_release, |
9745512c AV |
531 | }; |
532 | ||
533 | #endif | |
534 | ||
6ba51e37 AD |
535 | static int proc_oom_score(struct seq_file *m, struct pid_namespace *ns, |
536 | struct pid *pid, struct task_struct *task) | |
1da177e4 | 537 | { |
a7f638f9 | 538 | unsigned long totalpages = totalram_pages + total_swap_pages; |
b95c35e7 | 539 | unsigned long points = 0; |
1da177e4 | 540 | |
ef419398 ON |
541 | points = oom_badness(task, NULL, NULL, totalpages) * |
542 | 1000 / totalpages; | |
25ce3191 JP |
543 | seq_printf(m, "%lu\n", points); |
544 | ||
545 | return 0; | |
1da177e4 LT |
546 | } |
547 | ||
d85f50d5 | 548 | struct limit_names { |
cedbccab AD |
549 | const char *name; |
550 | const char *unit; | |
d85f50d5 NH |
551 | }; |
552 | ||
553 | static const struct limit_names lnames[RLIM_NLIMITS] = { | |
cff4edb5 | 554 | [RLIMIT_CPU] = {"Max cpu time", "seconds"}, |
d85f50d5 NH |
555 | [RLIMIT_FSIZE] = {"Max file size", "bytes"}, |
556 | [RLIMIT_DATA] = {"Max data size", "bytes"}, | |
557 | [RLIMIT_STACK] = {"Max stack size", "bytes"}, | |
558 | [RLIMIT_CORE] = {"Max core file size", "bytes"}, | |
559 | [RLIMIT_RSS] = {"Max resident set", "bytes"}, | |
560 | [RLIMIT_NPROC] = {"Max processes", "processes"}, | |
561 | [RLIMIT_NOFILE] = {"Max open files", "files"}, | |
562 | [RLIMIT_MEMLOCK] = {"Max locked memory", "bytes"}, | |
563 | [RLIMIT_AS] = {"Max address space", "bytes"}, | |
564 | [RLIMIT_LOCKS] = {"Max file locks", "locks"}, | |
565 | [RLIMIT_SIGPENDING] = {"Max pending signals", "signals"}, | |
566 | [RLIMIT_MSGQUEUE] = {"Max msgqueue size", "bytes"}, | |
567 | [RLIMIT_NICE] = {"Max nice priority", NULL}, | |
568 | [RLIMIT_RTPRIO] = {"Max realtime priority", NULL}, | |
8808117c | 569 | [RLIMIT_RTTIME] = {"Max realtime timeout", "us"}, |
d85f50d5 NH |
570 | }; |
571 | ||
572 | /* Display limits for a process */ | |
1c963eb1 AD |
573 | static int proc_pid_limits(struct seq_file *m, struct pid_namespace *ns, |
574 | struct pid *pid, struct task_struct *task) | |
d85f50d5 NH |
575 | { |
576 | unsigned int i; | |
d85f50d5 | 577 | unsigned long flags; |
d85f50d5 NH |
578 | |
579 | struct rlimit rlim[RLIM_NLIMITS]; | |
580 | ||
a6bebbc8 | 581 | if (!lock_task_sighand(task, &flags)) |
d85f50d5 | 582 | return 0; |
d85f50d5 NH |
583 | memcpy(rlim, task->signal->rlim, sizeof(struct rlimit) * RLIM_NLIMITS); |
584 | unlock_task_sighand(task, &flags); | |
d85f50d5 NH |
585 | |
586 | /* | |
587 | * print the file header | |
588 | */ | |
1c963eb1 | 589 | seq_printf(m, "%-25s %-20s %-20s %-10s\n", |
25ce3191 | 590 | "Limit", "Soft Limit", "Hard Limit", "Units"); |
d85f50d5 NH |
591 | |
592 | for (i = 0; i < RLIM_NLIMITS; i++) { | |
593 | if (rlim[i].rlim_cur == RLIM_INFINITY) | |
1c963eb1 | 594 | seq_printf(m, "%-25s %-20s ", |
25ce3191 | 595 | lnames[i].name, "unlimited"); |
d85f50d5 | 596 | else |
1c963eb1 | 597 | seq_printf(m, "%-25s %-20lu ", |
25ce3191 | 598 | lnames[i].name, rlim[i].rlim_cur); |
d85f50d5 NH |
599 | |
600 | if (rlim[i].rlim_max == RLIM_INFINITY) | |
1c963eb1 | 601 | seq_printf(m, "%-20s ", "unlimited"); |
d85f50d5 | 602 | else |
1c963eb1 | 603 | seq_printf(m, "%-20lu ", rlim[i].rlim_max); |
d85f50d5 NH |
604 | |
605 | if (lnames[i].unit) | |
1c963eb1 | 606 | seq_printf(m, "%-10s\n", lnames[i].unit); |
d85f50d5 | 607 | else |
1c963eb1 | 608 | seq_putc(m, '\n'); |
d85f50d5 NH |
609 | } |
610 | ||
1c963eb1 | 611 | return 0; |
d85f50d5 NH |
612 | } |
613 | ||
ebcb6734 | 614 | #ifdef CONFIG_HAVE_ARCH_TRACEHOOK |
09d93bd6 AD |
615 | static int proc_pid_syscall(struct seq_file *m, struct pid_namespace *ns, |
616 | struct pid *pid, struct task_struct *task) | |
ebcb6734 RM |
617 | { |
618 | long nr; | |
619 | unsigned long args[6], sp, pc; | |
25ce3191 JP |
620 | int res; |
621 | ||
622 | res = lock_trace(task); | |
a9712bc1 AV |
623 | if (res) |
624 | return res; | |
ebcb6734 RM |
625 | |
626 | if (task_current_syscall(task, &nr, args, 6, &sp, &pc)) | |
09d93bd6 | 627 | seq_puts(m, "running\n"); |
a9712bc1 | 628 | else if (nr < 0) |
09d93bd6 | 629 | seq_printf(m, "%ld 0x%lx 0x%lx\n", nr, sp, pc); |
a9712bc1 | 630 | else |
09d93bd6 | 631 | seq_printf(m, |
ebcb6734 RM |
632 | "%ld 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx\n", |
633 | nr, | |
634 | args[0], args[1], args[2], args[3], args[4], args[5], | |
635 | sp, pc); | |
a9712bc1 | 636 | unlock_trace(task); |
25ce3191 JP |
637 | |
638 | return 0; | |
ebcb6734 RM |
639 | } |
640 | #endif /* CONFIG_HAVE_ARCH_TRACEHOOK */ | |
641 | ||
1da177e4 LT |
642 | /************************************************************************/ |
643 | /* Here the fs part begins */ | |
644 | /************************************************************************/ | |
645 | ||
646 | /* permission checks */ | |
778c1144 | 647 | static int proc_fd_access_allowed(struct inode *inode) |
1da177e4 | 648 | { |
778c1144 EB |
649 | struct task_struct *task; |
650 | int allowed = 0; | |
df26c40e EB |
651 | /* Allow access to a task's file descriptors if it is us or we |
652 | * may use ptrace attach to the process and find out that | |
653 | * information. | |
778c1144 EB |
654 | */ |
655 | task = get_proc_task(inode); | |
df26c40e | 656 | if (task) { |
caaee623 | 657 | allowed = ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS); |
778c1144 | 658 | put_task_struct(task); |
df26c40e | 659 | } |
778c1144 | 660 | return allowed; |
1da177e4 LT |
661 | } |
662 | ||
6b4e306a | 663 | int proc_setattr(struct dentry *dentry, struct iattr *attr) |
6d76fa58 LT |
664 | { |
665 | int error; | |
2b0143b5 | 666 | struct inode *inode = d_inode(dentry); |
6d76fa58 LT |
667 | |
668 | if (attr->ia_valid & ATTR_MODE) | |
669 | return -EPERM; | |
670 | ||
31051c85 | 671 | error = setattr_prepare(dentry, attr); |
1025774c CH |
672 | if (error) |
673 | return error; | |
674 | ||
1025774c CH |
675 | setattr_copy(inode, attr); |
676 | mark_inode_dirty(inode); | |
677 | return 0; | |
6d76fa58 LT |
678 | } |
679 | ||
0499680a VK |
680 | /* |
681 | * May current process learn task's sched/cmdline info (for hide_pid_min=1) | |
682 | * or euid/egid (for hide_pid_min=2)? | |
683 | */ | |
684 | static bool has_pid_permissions(struct pid_namespace *pid, | |
685 | struct task_struct *task, | |
686 | int hide_pid_min) | |
687 | { | |
688 | if (pid->hide_pid < hide_pid_min) | |
689 | return true; | |
690 | if (in_group_p(pid->pid_gid)) | |
691 | return true; | |
caaee623 | 692 | return ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS); |
0499680a VK |
693 | } |
694 | ||
695 | ||
696 | static int proc_pid_permission(struct inode *inode, int mask) | |
697 | { | |
698 | struct pid_namespace *pid = inode->i_sb->s_fs_info; | |
699 | struct task_struct *task; | |
700 | bool has_perms; | |
701 | ||
702 | task = get_proc_task(inode); | |
a2ef990a XF |
703 | if (!task) |
704 | return -ESRCH; | |
796f571b | 705 | has_perms = has_pid_permissions(pid, task, HIDEPID_NO_ACCESS); |
0499680a VK |
706 | put_task_struct(task); |
707 | ||
708 | if (!has_perms) { | |
796f571b | 709 | if (pid->hide_pid == HIDEPID_INVISIBLE) { |
0499680a VK |
710 | /* |
711 | * Let's make getdents(), stat(), and open() | |
712 | * consistent with each other. If a process | |
713 | * may not stat() a file, it shouldn't be seen | |
714 | * in procfs at all. | |
715 | */ | |
716 | return -ENOENT; | |
717 | } | |
718 | ||
719 | return -EPERM; | |
720 | } | |
721 | return generic_permission(inode, mask); | |
722 | } | |
723 | ||
724 | ||
725 | ||
c5ef1c42 | 726 | static const struct inode_operations proc_def_inode_operations = { |
6d76fa58 LT |
727 | .setattr = proc_setattr, |
728 | }; | |
729 | ||
be614086 EB |
730 | static int proc_single_show(struct seq_file *m, void *v) |
731 | { | |
732 | struct inode *inode = m->private; | |
733 | struct pid_namespace *ns; | |
734 | struct pid *pid; | |
735 | struct task_struct *task; | |
736 | int ret; | |
737 | ||
738 | ns = inode->i_sb->s_fs_info; | |
739 | pid = proc_pid(inode); | |
740 | task = get_pid_task(pid, PIDTYPE_PID); | |
741 | if (!task) | |
742 | return -ESRCH; | |
743 | ||
744 | ret = PROC_I(inode)->op.proc_show(m, ns, pid, task); | |
745 | ||
746 | put_task_struct(task); | |
747 | return ret; | |
748 | } | |
749 | ||
750 | static int proc_single_open(struct inode *inode, struct file *filp) | |
751 | { | |
c6a34058 | 752 | return single_open(filp, proc_single_show, inode); |
be614086 EB |
753 | } |
754 | ||
755 | static const struct file_operations proc_single_file_operations = { | |
756 | .open = proc_single_open, | |
757 | .read = seq_read, | |
758 | .llseek = seq_lseek, | |
759 | .release = single_release, | |
760 | }; | |
761 | ||
5381e169 ON |
762 | |
763 | struct mm_struct *proc_mem_open(struct inode *inode, unsigned int mode) | |
1da177e4 | 764 | { |
5381e169 ON |
765 | struct task_struct *task = get_proc_task(inode); |
766 | struct mm_struct *mm = ERR_PTR(-ESRCH); | |
e268337d | 767 | |
5381e169 | 768 | if (task) { |
caaee623 | 769 | mm = mm_access(task, mode | PTRACE_MODE_FSCREDS); |
5381e169 | 770 | put_task_struct(task); |
e268337d | 771 | |
5381e169 ON |
772 | if (!IS_ERR_OR_NULL(mm)) { |
773 | /* ensure this mm_struct can't be freed */ | |
f1f10076 | 774 | mmgrab(mm); |
5381e169 ON |
775 | /* but do not pin its memory */ |
776 | mmput(mm); | |
777 | } | |
778 | } | |
779 | ||
780 | return mm; | |
781 | } | |
782 | ||
783 | static int __mem_open(struct inode *inode, struct file *file, unsigned int mode) | |
784 | { | |
785 | struct mm_struct *mm = proc_mem_open(inode, mode); | |
e268337d LT |
786 | |
787 | if (IS_ERR(mm)) | |
788 | return PTR_ERR(mm); | |
789 | ||
e268337d | 790 | file->private_data = mm; |
1da177e4 LT |
791 | return 0; |
792 | } | |
793 | ||
b409e578 CW |
794 | static int mem_open(struct inode *inode, struct file *file) |
795 | { | |
bc452b4b DH |
796 | int ret = __mem_open(inode, file, PTRACE_MODE_ATTACH); |
797 | ||
798 | /* OK to pass negative loff_t, we can catch out-of-range */ | |
799 | file->f_mode |= FMODE_UNSIGNED_OFFSET; | |
800 | ||
801 | return ret; | |
b409e578 CW |
802 | } |
803 | ||
572d34b9 ON |
804 | static ssize_t mem_rw(struct file *file, char __user *buf, |
805 | size_t count, loff_t *ppos, int write) | |
1da177e4 | 806 | { |
e268337d | 807 | struct mm_struct *mm = file->private_data; |
572d34b9 ON |
808 | unsigned long addr = *ppos; |
809 | ssize_t copied; | |
1da177e4 | 810 | char *page; |
272ddc8b | 811 | unsigned int flags; |
1da177e4 | 812 | |
e268337d LT |
813 | if (!mm) |
814 | return 0; | |
99f89551 | 815 | |
30cd8903 KM |
816 | page = (char *)__get_free_page(GFP_TEMPORARY); |
817 | if (!page) | |
e268337d | 818 | return -ENOMEM; |
1da177e4 | 819 | |
f7ca54f4 | 820 | copied = 0; |
388f7934 | 821 | if (!mmget_not_zero(mm)) |
6d08f2c7 ON |
822 | goto free; |
823 | ||
272ddc8b LT |
824 | /* Maybe we should limit FOLL_FORCE to actual ptrace users? */ |
825 | flags = FOLL_FORCE; | |
6347e8d5 LS |
826 | if (write) |
827 | flags |= FOLL_WRITE; | |
828 | ||
1da177e4 | 829 | while (count > 0) { |
572d34b9 | 830 | int this_len = min_t(int, count, PAGE_SIZE); |
1da177e4 | 831 | |
572d34b9 | 832 | if (write && copy_from_user(page, buf, this_len)) { |
1da177e4 LT |
833 | copied = -EFAULT; |
834 | break; | |
835 | } | |
572d34b9 | 836 | |
6347e8d5 | 837 | this_len = access_remote_vm(mm, addr, page, this_len, flags); |
572d34b9 | 838 | if (!this_len) { |
1da177e4 LT |
839 | if (!copied) |
840 | copied = -EIO; | |
841 | break; | |
842 | } | |
572d34b9 ON |
843 | |
844 | if (!write && copy_to_user(buf, page, this_len)) { | |
845 | copied = -EFAULT; | |
846 | break; | |
847 | } | |
848 | ||
849 | buf += this_len; | |
850 | addr += this_len; | |
851 | copied += this_len; | |
852 | count -= this_len; | |
1da177e4 | 853 | } |
572d34b9 | 854 | *ppos = addr; |
30cd8903 | 855 | |
6d08f2c7 ON |
856 | mmput(mm); |
857 | free: | |
30cd8903 | 858 | free_page((unsigned long) page); |
1da177e4 LT |
859 | return copied; |
860 | } | |
1da177e4 | 861 | |
572d34b9 ON |
862 | static ssize_t mem_read(struct file *file, char __user *buf, |
863 | size_t count, loff_t *ppos) | |
864 | { | |
865 | return mem_rw(file, buf, count, ppos, 0); | |
866 | } | |
867 | ||
868 | static ssize_t mem_write(struct file *file, const char __user *buf, | |
869 | size_t count, loff_t *ppos) | |
870 | { | |
871 | return mem_rw(file, (char __user*)buf, count, ppos, 1); | |
872 | } | |
873 | ||
85863e47 | 874 | loff_t mem_lseek(struct file *file, loff_t offset, int orig) |
1da177e4 LT |
875 | { |
876 | switch (orig) { | |
877 | case 0: | |
878 | file->f_pos = offset; | |
879 | break; | |
880 | case 1: | |
881 | file->f_pos += offset; | |
882 | break; | |
883 | default: | |
884 | return -EINVAL; | |
885 | } | |
886 | force_successful_syscall_return(); | |
887 | return file->f_pos; | |
888 | } | |
889 | ||
e268337d LT |
890 | static int mem_release(struct inode *inode, struct file *file) |
891 | { | |
892 | struct mm_struct *mm = file->private_data; | |
71879d3c | 893 | if (mm) |
6d08f2c7 | 894 | mmdrop(mm); |
e268337d LT |
895 | return 0; |
896 | } | |
897 | ||
00977a59 | 898 | static const struct file_operations proc_mem_operations = { |
1da177e4 LT |
899 | .llseek = mem_lseek, |
900 | .read = mem_read, | |
901 | .write = mem_write, | |
902 | .open = mem_open, | |
e268337d | 903 | .release = mem_release, |
1da177e4 LT |
904 | }; |
905 | ||
b409e578 CW |
906 | static int environ_open(struct inode *inode, struct file *file) |
907 | { | |
908 | return __mem_open(inode, file, PTRACE_MODE_READ); | |
909 | } | |
910 | ||
315e28c8 JP |
911 | static ssize_t environ_read(struct file *file, char __user *buf, |
912 | size_t count, loff_t *ppos) | |
913 | { | |
315e28c8 JP |
914 | char *page; |
915 | unsigned long src = *ppos; | |
b409e578 CW |
916 | int ret = 0; |
917 | struct mm_struct *mm = file->private_data; | |
a3b609ef | 918 | unsigned long env_start, env_end; |
315e28c8 | 919 | |
8148a73c MK |
920 | /* Ensure the process spawned far enough to have an environment. */ |
921 | if (!mm || !mm->env_end) | |
b409e578 | 922 | return 0; |
315e28c8 | 923 | |
315e28c8 JP |
924 | page = (char *)__get_free_page(GFP_TEMPORARY); |
925 | if (!page) | |
b409e578 | 926 | return -ENOMEM; |
315e28c8 | 927 | |
d6f64b89 | 928 | ret = 0; |
388f7934 | 929 | if (!mmget_not_zero(mm)) |
b409e578 | 930 | goto free; |
a3b609ef MG |
931 | |
932 | down_read(&mm->mmap_sem); | |
933 | env_start = mm->env_start; | |
934 | env_end = mm->env_end; | |
935 | up_read(&mm->mmap_sem); | |
936 | ||
315e28c8 | 937 | while (count > 0) { |
e8905ec2 DH |
938 | size_t this_len, max_len; |
939 | int retval; | |
315e28c8 | 940 | |
a3b609ef | 941 | if (src >= (env_end - env_start)) |
315e28c8 JP |
942 | break; |
943 | ||
a3b609ef | 944 | this_len = env_end - (env_start + src); |
e8905ec2 DH |
945 | |
946 | max_len = min_t(size_t, PAGE_SIZE, count); | |
947 | this_len = min(max_len, this_len); | |
315e28c8 | 948 | |
272ddc8b | 949 | retval = access_remote_vm(mm, (env_start + src), page, this_len, 0); |
315e28c8 JP |
950 | |
951 | if (retval <= 0) { | |
952 | ret = retval; | |
953 | break; | |
954 | } | |
955 | ||
956 | if (copy_to_user(buf, page, retval)) { | |
957 | ret = -EFAULT; | |
958 | break; | |
959 | } | |
960 | ||
961 | ret += retval; | |
962 | src += retval; | |
963 | buf += retval; | |
964 | count -= retval; | |
965 | } | |
966 | *ppos = src; | |
315e28c8 | 967 | mmput(mm); |
b409e578 CW |
968 | |
969 | free: | |
315e28c8 | 970 | free_page((unsigned long) page); |
315e28c8 JP |
971 | return ret; |
972 | } | |
973 | ||
974 | static const struct file_operations proc_environ_operations = { | |
b409e578 | 975 | .open = environ_open, |
315e28c8 | 976 | .read = environ_read, |
87df8424 | 977 | .llseek = generic_file_llseek, |
b409e578 | 978 | .release = mem_release, |
315e28c8 JP |
979 | }; |
980 | ||
c5317167 AV |
981 | static int auxv_open(struct inode *inode, struct file *file) |
982 | { | |
983 | return __mem_open(inode, file, PTRACE_MODE_READ_FSCREDS); | |
984 | } | |
985 | ||
986 | static ssize_t auxv_read(struct file *file, char __user *buf, | |
987 | size_t count, loff_t *ppos) | |
988 | { | |
989 | struct mm_struct *mm = file->private_data; | |
990 | unsigned int nwords = 0; | |
06b2849d LY |
991 | |
992 | if (!mm) | |
993 | return 0; | |
c5317167 AV |
994 | do { |
995 | nwords += 2; | |
996 | } while (mm->saved_auxv[nwords - 2] != 0); /* AT_NULL */ | |
997 | return simple_read_from_buffer(buf, count, ppos, mm->saved_auxv, | |
998 | nwords * sizeof(mm->saved_auxv[0])); | |
999 | } | |
1000 | ||
1001 | static const struct file_operations proc_auxv_operations = { | |
1002 | .open = auxv_open, | |
1003 | .read = auxv_read, | |
1004 | .llseek = generic_file_llseek, | |
1005 | .release = mem_release, | |
1006 | }; | |
1007 | ||
fa0cbbf1 DR |
1008 | static ssize_t oom_adj_read(struct file *file, char __user *buf, size_t count, |
1009 | loff_t *ppos) | |
1010 | { | |
496ad9aa | 1011 | struct task_struct *task = get_proc_task(file_inode(file)); |
fa0cbbf1 DR |
1012 | char buffer[PROC_NUMBUF]; |
1013 | int oom_adj = OOM_ADJUST_MIN; | |
1014 | size_t len; | |
fa0cbbf1 DR |
1015 | |
1016 | if (!task) | |
1017 | return -ESRCH; | |
f913da59 MH |
1018 | if (task->signal->oom_score_adj == OOM_SCORE_ADJ_MAX) |
1019 | oom_adj = OOM_ADJUST_MAX; | |
1020 | else | |
1021 | oom_adj = (task->signal->oom_score_adj * -OOM_DISABLE) / | |
1022 | OOM_SCORE_ADJ_MAX; | |
fa0cbbf1 DR |
1023 | put_task_struct(task); |
1024 | len = snprintf(buffer, sizeof(buffer), "%d\n", oom_adj); | |
1025 | return simple_read_from_buffer(buf, count, ppos, buffer, len); | |
1026 | } | |
1027 | ||
1d5f0acb MH |
1028 | static int __set_oom_adj(struct file *file, int oom_adj, bool legacy) |
1029 | { | |
1030 | static DEFINE_MUTEX(oom_adj_mutex); | |
44a70ade | 1031 | struct mm_struct *mm = NULL; |
1d5f0acb MH |
1032 | struct task_struct *task; |
1033 | int err = 0; | |
1034 | ||
1035 | task = get_proc_task(file_inode(file)); | |
1036 | if (!task) | |
1037 | return -ESRCH; | |
1038 | ||
1039 | mutex_lock(&oom_adj_mutex); | |
1040 | if (legacy) { | |
1041 | if (oom_adj < task->signal->oom_score_adj && | |
1042 | !capable(CAP_SYS_RESOURCE)) { | |
1043 | err = -EACCES; | |
1044 | goto err_unlock; | |
1045 | } | |
1046 | /* | |
1047 | * /proc/pid/oom_adj is provided for legacy purposes, ask users to use | |
1048 | * /proc/pid/oom_score_adj instead. | |
1049 | */ | |
1050 | pr_warn_once("%s (%d): /proc/%d/oom_adj is deprecated, please use /proc/%d/oom_score_adj instead.\n", | |
1051 | current->comm, task_pid_nr(current), task_pid_nr(task), | |
1052 | task_pid_nr(task)); | |
1053 | } else { | |
1054 | if ((short)oom_adj < task->signal->oom_score_adj_min && | |
1055 | !capable(CAP_SYS_RESOURCE)) { | |
1056 | err = -EACCES; | |
1057 | goto err_unlock; | |
1058 | } | |
1059 | } | |
1060 | ||
44a70ade MH |
1061 | /* |
1062 | * Make sure we will check other processes sharing the mm if this is | |
1063 | * not vfrok which wants its own oom_score_adj. | |
1064 | * pin the mm so it doesn't go away and get reused after task_unlock | |
1065 | */ | |
1066 | if (!task->vfork_done) { | |
1067 | struct task_struct *p = find_lock_task_mm(task); | |
1068 | ||
1069 | if (p) { | |
1070 | if (atomic_read(&p->mm->mm_users) > 1) { | |
1071 | mm = p->mm; | |
f1f10076 | 1072 | mmgrab(mm); |
44a70ade MH |
1073 | } |
1074 | task_unlock(p); | |
1075 | } | |
1076 | } | |
1077 | ||
1d5f0acb MH |
1078 | task->signal->oom_score_adj = oom_adj; |
1079 | if (!legacy && has_capability_noaudit(current, CAP_SYS_RESOURCE)) | |
1080 | task->signal->oom_score_adj_min = (short)oom_adj; | |
1081 | trace_oom_score_adj_update(task); | |
44a70ade MH |
1082 | |
1083 | if (mm) { | |
1084 | struct task_struct *p; | |
1085 | ||
1086 | rcu_read_lock(); | |
1087 | for_each_process(p) { | |
1088 | if (same_thread_group(task, p)) | |
1089 | continue; | |
1090 | ||
1091 | /* do not touch kernel threads or the global init */ | |
1092 | if (p->flags & PF_KTHREAD || is_global_init(p)) | |
1093 | continue; | |
1094 | ||
1095 | task_lock(p); | |
1096 | if (!p->vfork_done && process_shares_mm(p, mm)) { | |
1097 | 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", | |
1098 | task_pid_nr(p), p->comm, | |
1099 | p->signal->oom_score_adj, oom_adj, | |
1100 | task_pid_nr(task), task->comm); | |
1101 | p->signal->oom_score_adj = oom_adj; | |
1102 | if (!legacy && has_capability_noaudit(current, CAP_SYS_RESOURCE)) | |
1103 | p->signal->oom_score_adj_min = (short)oom_adj; | |
1104 | } | |
1105 | task_unlock(p); | |
1106 | } | |
1107 | rcu_read_unlock(); | |
1108 | mmdrop(mm); | |
1109 | } | |
1d5f0acb MH |
1110 | err_unlock: |
1111 | mutex_unlock(&oom_adj_mutex); | |
1112 | put_task_struct(task); | |
1113 | return err; | |
1114 | } | |
f913da59 | 1115 | |
b72bdfa7 DR |
1116 | /* |
1117 | * /proc/pid/oom_adj exists solely for backwards compatibility with previous | |
1118 | * kernels. The effective policy is defined by oom_score_adj, which has a | |
1119 | * different scale: oom_adj grew exponentially and oom_score_adj grows linearly. | |
1120 | * Values written to oom_adj are simply mapped linearly to oom_score_adj. | |
1121 | * Processes that become oom disabled via oom_adj will still be oom disabled | |
1122 | * with this implementation. | |
1123 | * | |
1124 | * oom_adj cannot be removed since existing userspace binaries use it. | |
1125 | */ | |
fa0cbbf1 DR |
1126 | static ssize_t oom_adj_write(struct file *file, const char __user *buf, |
1127 | size_t count, loff_t *ppos) | |
1128 | { | |
fa0cbbf1 DR |
1129 | char buffer[PROC_NUMBUF]; |
1130 | int oom_adj; | |
fa0cbbf1 DR |
1131 | int err; |
1132 | ||
1133 | memset(buffer, 0, sizeof(buffer)); | |
1134 | if (count > sizeof(buffer) - 1) | |
1135 | count = sizeof(buffer) - 1; | |
1136 | if (copy_from_user(buffer, buf, count)) { | |
1137 | err = -EFAULT; | |
1138 | goto out; | |
1139 | } | |
1140 | ||
1141 | err = kstrtoint(strstrip(buffer), 0, &oom_adj); | |
1142 | if (err) | |
1143 | goto out; | |
1144 | if ((oom_adj < OOM_ADJUST_MIN || oom_adj > OOM_ADJUST_MAX) && | |
1145 | oom_adj != OOM_DISABLE) { | |
1146 | err = -EINVAL; | |
1147 | goto out; | |
1148 | } | |
1149 | ||
fa0cbbf1 DR |
1150 | /* |
1151 | * Scale /proc/pid/oom_score_adj appropriately ensuring that a maximum | |
1152 | * value is always attainable. | |
1153 | */ | |
1154 | if (oom_adj == OOM_ADJUST_MAX) | |
1155 | oom_adj = OOM_SCORE_ADJ_MAX; | |
1156 | else | |
1157 | oom_adj = (oom_adj * OOM_SCORE_ADJ_MAX) / -OOM_DISABLE; | |
1158 | ||
1d5f0acb | 1159 | err = __set_oom_adj(file, oom_adj, true); |
fa0cbbf1 DR |
1160 | out: |
1161 | return err < 0 ? err : count; | |
1162 | } | |
1163 | ||
1164 | static const struct file_operations proc_oom_adj_operations = { | |
1165 | .read = oom_adj_read, | |
1166 | .write = oom_adj_write, | |
1167 | .llseek = generic_file_llseek, | |
1168 | }; | |
1169 | ||
a63d83f4 DR |
1170 | static ssize_t oom_score_adj_read(struct file *file, char __user *buf, |
1171 | size_t count, loff_t *ppos) | |
1172 | { | |
496ad9aa | 1173 | struct task_struct *task = get_proc_task(file_inode(file)); |
a63d83f4 | 1174 | char buffer[PROC_NUMBUF]; |
a9c58b90 | 1175 | short oom_score_adj = OOM_SCORE_ADJ_MIN; |
a63d83f4 DR |
1176 | size_t len; |
1177 | ||
1178 | if (!task) | |
1179 | return -ESRCH; | |
f913da59 | 1180 | oom_score_adj = task->signal->oom_score_adj; |
a63d83f4 | 1181 | put_task_struct(task); |
a9c58b90 | 1182 | len = snprintf(buffer, sizeof(buffer), "%hd\n", oom_score_adj); |
a63d83f4 DR |
1183 | return simple_read_from_buffer(buf, count, ppos, buffer, len); |
1184 | } | |
1185 | ||
1186 | static ssize_t oom_score_adj_write(struct file *file, const char __user *buf, | |
1187 | size_t count, loff_t *ppos) | |
1188 | { | |
a63d83f4 | 1189 | char buffer[PROC_NUMBUF]; |
0a8cb8e3 | 1190 | int oom_score_adj; |
a63d83f4 DR |
1191 | int err; |
1192 | ||
1193 | memset(buffer, 0, sizeof(buffer)); | |
1194 | if (count > sizeof(buffer) - 1) | |
1195 | count = sizeof(buffer) - 1; | |
723548bf DR |
1196 | if (copy_from_user(buffer, buf, count)) { |
1197 | err = -EFAULT; | |
1198 | goto out; | |
1199 | } | |
a63d83f4 | 1200 | |
0a8cb8e3 | 1201 | err = kstrtoint(strstrip(buffer), 0, &oom_score_adj); |
a63d83f4 | 1202 | if (err) |
723548bf | 1203 | goto out; |
a63d83f4 | 1204 | if (oom_score_adj < OOM_SCORE_ADJ_MIN || |
723548bf DR |
1205 | oom_score_adj > OOM_SCORE_ADJ_MAX) { |
1206 | err = -EINVAL; | |
1207 | goto out; | |
1208 | } | |
a63d83f4 | 1209 | |
1d5f0acb | 1210 | err = __set_oom_adj(file, oom_score_adj, false); |
723548bf DR |
1211 | out: |
1212 | return err < 0 ? err : count; | |
a63d83f4 DR |
1213 | } |
1214 | ||
1215 | static const struct file_operations proc_oom_score_adj_operations = { | |
1216 | .read = oom_score_adj_read, | |
1217 | .write = oom_score_adj_write, | |
6038f373 | 1218 | .llseek = default_llseek, |
a63d83f4 DR |
1219 | }; |
1220 | ||
1da177e4 | 1221 | #ifdef CONFIG_AUDITSYSCALL |
b4eb4f7f | 1222 | #define TMPBUFLEN 11 |
1da177e4 LT |
1223 | static ssize_t proc_loginuid_read(struct file * file, char __user * buf, |
1224 | size_t count, loff_t *ppos) | |
1225 | { | |
496ad9aa | 1226 | struct inode * inode = file_inode(file); |
99f89551 | 1227 | struct task_struct *task = get_proc_task(inode); |
1da177e4 LT |
1228 | ssize_t length; |
1229 | char tmpbuf[TMPBUFLEN]; | |
1230 | ||
99f89551 EB |
1231 | if (!task) |
1232 | return -ESRCH; | |
1da177e4 | 1233 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", |
e1760bd5 EB |
1234 | from_kuid(file->f_cred->user_ns, |
1235 | audit_get_loginuid(task))); | |
99f89551 | 1236 | put_task_struct(task); |
1da177e4 LT |
1237 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); |
1238 | } | |
1239 | ||
1240 | static ssize_t proc_loginuid_write(struct file * file, const char __user * buf, | |
1241 | size_t count, loff_t *ppos) | |
1242 | { | |
496ad9aa | 1243 | struct inode * inode = file_inode(file); |
1da177e4 | 1244 | uid_t loginuid; |
e1760bd5 | 1245 | kuid_t kloginuid; |
774636e1 | 1246 | int rv; |
1da177e4 | 1247 | |
7dc52157 PM |
1248 | rcu_read_lock(); |
1249 | if (current != pid_task(proc_pid(inode), PIDTYPE_PID)) { | |
1250 | rcu_read_unlock(); | |
1da177e4 | 1251 | return -EPERM; |
7dc52157 PM |
1252 | } |
1253 | rcu_read_unlock(); | |
1da177e4 | 1254 | |
1da177e4 LT |
1255 | if (*ppos != 0) { |
1256 | /* No partial writes. */ | |
1257 | return -EINVAL; | |
1258 | } | |
1da177e4 | 1259 | |
774636e1 AD |
1260 | rv = kstrtou32_from_user(buf, count, 10, &loginuid); |
1261 | if (rv < 0) | |
1262 | return rv; | |
81407c84 EP |
1263 | |
1264 | /* is userspace tring to explicitly UNSET the loginuid? */ | |
1265 | if (loginuid == AUDIT_UID_UNSET) { | |
1266 | kloginuid = INVALID_UID; | |
1267 | } else { | |
1268 | kloginuid = make_kuid(file->f_cred->user_ns, loginuid); | |
774636e1 AD |
1269 | if (!uid_valid(kloginuid)) |
1270 | return -EINVAL; | |
e1760bd5 EB |
1271 | } |
1272 | ||
774636e1 AD |
1273 | rv = audit_set_loginuid(kloginuid); |
1274 | if (rv < 0) | |
1275 | return rv; | |
1276 | return count; | |
1da177e4 LT |
1277 | } |
1278 | ||
00977a59 | 1279 | static const struct file_operations proc_loginuid_operations = { |
1da177e4 LT |
1280 | .read = proc_loginuid_read, |
1281 | .write = proc_loginuid_write, | |
87df8424 | 1282 | .llseek = generic_file_llseek, |
1da177e4 | 1283 | }; |
1e0bd755 EP |
1284 | |
1285 | static ssize_t proc_sessionid_read(struct file * file, char __user * buf, | |
1286 | size_t count, loff_t *ppos) | |
1287 | { | |
496ad9aa | 1288 | struct inode * inode = file_inode(file); |
1e0bd755 EP |
1289 | struct task_struct *task = get_proc_task(inode); |
1290 | ssize_t length; | |
1291 | char tmpbuf[TMPBUFLEN]; | |
1292 | ||
1293 | if (!task) | |
1294 | return -ESRCH; | |
1295 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", | |
1296 | audit_get_sessionid(task)); | |
1297 | put_task_struct(task); | |
1298 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
1299 | } | |
1300 | ||
1301 | static const struct file_operations proc_sessionid_operations = { | |
1302 | .read = proc_sessionid_read, | |
87df8424 | 1303 | .llseek = generic_file_llseek, |
1e0bd755 | 1304 | }; |
1da177e4 LT |
1305 | #endif |
1306 | ||
f4f154fd AM |
1307 | #ifdef CONFIG_FAULT_INJECTION |
1308 | static ssize_t proc_fault_inject_read(struct file * file, char __user * buf, | |
1309 | size_t count, loff_t *ppos) | |
1310 | { | |
496ad9aa | 1311 | struct task_struct *task = get_proc_task(file_inode(file)); |
f4f154fd AM |
1312 | char buffer[PROC_NUMBUF]; |
1313 | size_t len; | |
1314 | int make_it_fail; | |
f4f154fd AM |
1315 | |
1316 | if (!task) | |
1317 | return -ESRCH; | |
1318 | make_it_fail = task->make_it_fail; | |
1319 | put_task_struct(task); | |
1320 | ||
1321 | len = snprintf(buffer, sizeof(buffer), "%i\n", make_it_fail); | |
0c28f287 AM |
1322 | |
1323 | return simple_read_from_buffer(buf, count, ppos, buffer, len); | |
f4f154fd AM |
1324 | } |
1325 | ||
1326 | static ssize_t proc_fault_inject_write(struct file * file, | |
1327 | const char __user * buf, size_t count, loff_t *ppos) | |
1328 | { | |
1329 | struct task_struct *task; | |
774636e1 | 1330 | char buffer[PROC_NUMBUF]; |
f4f154fd | 1331 | int make_it_fail; |
774636e1 | 1332 | int rv; |
f4f154fd AM |
1333 | |
1334 | if (!capable(CAP_SYS_RESOURCE)) | |
1335 | return -EPERM; | |
1336 | memset(buffer, 0, sizeof(buffer)); | |
1337 | if (count > sizeof(buffer) - 1) | |
1338 | count = sizeof(buffer) - 1; | |
1339 | if (copy_from_user(buffer, buf, count)) | |
1340 | return -EFAULT; | |
774636e1 AD |
1341 | rv = kstrtoint(strstrip(buffer), 0, &make_it_fail); |
1342 | if (rv < 0) | |
1343 | return rv; | |
16caed31 DJ |
1344 | if (make_it_fail < 0 || make_it_fail > 1) |
1345 | return -EINVAL; | |
1346 | ||
496ad9aa | 1347 | task = get_proc_task(file_inode(file)); |
f4f154fd AM |
1348 | if (!task) |
1349 | return -ESRCH; | |
1350 | task->make_it_fail = make_it_fail; | |
1351 | put_task_struct(task); | |
cba8aafe VL |
1352 | |
1353 | return count; | |
f4f154fd AM |
1354 | } |
1355 | ||
00977a59 | 1356 | static const struct file_operations proc_fault_inject_operations = { |
f4f154fd AM |
1357 | .read = proc_fault_inject_read, |
1358 | .write = proc_fault_inject_write, | |
87df8424 | 1359 | .llseek = generic_file_llseek, |
f4f154fd AM |
1360 | }; |
1361 | #endif | |
1362 | ||
9745512c | 1363 | |
43ae34cb IM |
1364 | #ifdef CONFIG_SCHED_DEBUG |
1365 | /* | |
1366 | * Print out various scheduling related per-task fields: | |
1367 | */ | |
1368 | static int sched_show(struct seq_file *m, void *v) | |
1369 | { | |
1370 | struct inode *inode = m->private; | |
1371 | struct task_struct *p; | |
1372 | ||
43ae34cb IM |
1373 | p = get_proc_task(inode); |
1374 | if (!p) | |
1375 | return -ESRCH; | |
1376 | proc_sched_show_task(p, m); | |
1377 | ||
1378 | put_task_struct(p); | |
1379 | ||
1380 | return 0; | |
1381 | } | |
1382 | ||
1383 | static ssize_t | |
1384 | sched_write(struct file *file, const char __user *buf, | |
1385 | size_t count, loff_t *offset) | |
1386 | { | |
496ad9aa | 1387 | struct inode *inode = file_inode(file); |
43ae34cb IM |
1388 | struct task_struct *p; |
1389 | ||
43ae34cb IM |
1390 | p = get_proc_task(inode); |
1391 | if (!p) | |
1392 | return -ESRCH; | |
1393 | proc_sched_set_task(p); | |
1394 | ||
1395 | put_task_struct(p); | |
1396 | ||
1397 | return count; | |
1398 | } | |
1399 | ||
1400 | static int sched_open(struct inode *inode, struct file *filp) | |
1401 | { | |
c6a34058 | 1402 | return single_open(filp, sched_show, inode); |
43ae34cb IM |
1403 | } |
1404 | ||
1405 | static const struct file_operations proc_pid_sched_operations = { | |
1406 | .open = sched_open, | |
1407 | .read = seq_read, | |
1408 | .write = sched_write, | |
1409 | .llseek = seq_lseek, | |
5ea473a1 | 1410 | .release = single_release, |
43ae34cb IM |
1411 | }; |
1412 | ||
1413 | #endif | |
1414 | ||
5091faa4 MG |
1415 | #ifdef CONFIG_SCHED_AUTOGROUP |
1416 | /* | |
1417 | * Print out autogroup related information: | |
1418 | */ | |
1419 | static int sched_autogroup_show(struct seq_file *m, void *v) | |
1420 | { | |
1421 | struct inode *inode = m->private; | |
1422 | struct task_struct *p; | |
1423 | ||
1424 | p = get_proc_task(inode); | |
1425 | if (!p) | |
1426 | return -ESRCH; | |
1427 | proc_sched_autogroup_show_task(p, m); | |
1428 | ||
1429 | put_task_struct(p); | |
1430 | ||
1431 | return 0; | |
1432 | } | |
1433 | ||
1434 | static ssize_t | |
1435 | sched_autogroup_write(struct file *file, const char __user *buf, | |
1436 | size_t count, loff_t *offset) | |
1437 | { | |
496ad9aa | 1438 | struct inode *inode = file_inode(file); |
5091faa4 MG |
1439 | struct task_struct *p; |
1440 | char buffer[PROC_NUMBUF]; | |
0a8cb8e3 | 1441 | int nice; |
5091faa4 MG |
1442 | int err; |
1443 | ||
1444 | memset(buffer, 0, sizeof(buffer)); | |
1445 | if (count > sizeof(buffer) - 1) | |
1446 | count = sizeof(buffer) - 1; | |
1447 | if (copy_from_user(buffer, buf, count)) | |
1448 | return -EFAULT; | |
1449 | ||
0a8cb8e3 AD |
1450 | err = kstrtoint(strstrip(buffer), 0, &nice); |
1451 | if (err < 0) | |
1452 | return err; | |
5091faa4 MG |
1453 | |
1454 | p = get_proc_task(inode); | |
1455 | if (!p) | |
1456 | return -ESRCH; | |
1457 | ||
2e5b5b3a | 1458 | err = proc_sched_autogroup_set_nice(p, nice); |
5091faa4 MG |
1459 | if (err) |
1460 | count = err; | |
1461 | ||
1462 | put_task_struct(p); | |
1463 | ||
1464 | return count; | |
1465 | } | |
1466 | ||
1467 | static int sched_autogroup_open(struct inode *inode, struct file *filp) | |
1468 | { | |
1469 | int ret; | |
1470 | ||
1471 | ret = single_open(filp, sched_autogroup_show, NULL); | |
1472 | if (!ret) { | |
1473 | struct seq_file *m = filp->private_data; | |
1474 | ||
1475 | m->private = inode; | |
1476 | } | |
1477 | return ret; | |
1478 | } | |
1479 | ||
1480 | static const struct file_operations proc_pid_sched_autogroup_operations = { | |
1481 | .open = sched_autogroup_open, | |
1482 | .read = seq_read, | |
1483 | .write = sched_autogroup_write, | |
1484 | .llseek = seq_lseek, | |
1485 | .release = single_release, | |
1486 | }; | |
1487 | ||
1488 | #endif /* CONFIG_SCHED_AUTOGROUP */ | |
1489 | ||
4614a696 | 1490 | static ssize_t comm_write(struct file *file, const char __user *buf, |
1491 | size_t count, loff_t *offset) | |
1492 | { | |
496ad9aa | 1493 | struct inode *inode = file_inode(file); |
4614a696 | 1494 | struct task_struct *p; |
1495 | char buffer[TASK_COMM_LEN]; | |
830e0fc9 | 1496 | const size_t maxlen = sizeof(buffer) - 1; |
4614a696 | 1497 | |
1498 | memset(buffer, 0, sizeof(buffer)); | |
830e0fc9 | 1499 | if (copy_from_user(buffer, buf, count > maxlen ? maxlen : count)) |
4614a696 | 1500 | return -EFAULT; |
1501 | ||
1502 | p = get_proc_task(inode); | |
1503 | if (!p) | |
1504 | return -ESRCH; | |
1505 | ||
1506 | if (same_thread_group(current, p)) | |
1507 | set_task_comm(p, buffer); | |
1508 | else | |
1509 | count = -EINVAL; | |
1510 | ||
1511 | put_task_struct(p); | |
1512 | ||
1513 | return count; | |
1514 | } | |
1515 | ||
1516 | static int comm_show(struct seq_file *m, void *v) | |
1517 | { | |
1518 | struct inode *inode = m->private; | |
1519 | struct task_struct *p; | |
1520 | ||
1521 | p = get_proc_task(inode); | |
1522 | if (!p) | |
1523 | return -ESRCH; | |
1524 | ||
1525 | task_lock(p); | |
1526 | seq_printf(m, "%s\n", p->comm); | |
1527 | task_unlock(p); | |
1528 | ||
1529 | put_task_struct(p); | |
1530 | ||
1531 | return 0; | |
1532 | } | |
1533 | ||
1534 | static int comm_open(struct inode *inode, struct file *filp) | |
1535 | { | |
c6a34058 | 1536 | return single_open(filp, comm_show, inode); |
4614a696 | 1537 | } |
1538 | ||
1539 | static const struct file_operations proc_pid_set_comm_operations = { | |
1540 | .open = comm_open, | |
1541 | .read = seq_read, | |
1542 | .write = comm_write, | |
1543 | .llseek = seq_lseek, | |
1544 | .release = single_release, | |
1545 | }; | |
1546 | ||
7773fbc5 | 1547 | static int proc_exe_link(struct dentry *dentry, struct path *exe_path) |
925d1c40 MH |
1548 | { |
1549 | struct task_struct *task; | |
925d1c40 MH |
1550 | struct file *exe_file; |
1551 | ||
2b0143b5 | 1552 | task = get_proc_task(d_inode(dentry)); |
925d1c40 MH |
1553 | if (!task) |
1554 | return -ENOENT; | |
cd81a917 | 1555 | exe_file = get_task_exe_file(task); |
925d1c40 | 1556 | put_task_struct(task); |
925d1c40 MH |
1557 | if (exe_file) { |
1558 | *exe_path = exe_file->f_path; | |
1559 | path_get(&exe_file->f_path); | |
1560 | fput(exe_file); | |
1561 | return 0; | |
1562 | } else | |
1563 | return -ENOENT; | |
1564 | } | |
1565 | ||
6b255391 | 1566 | static const char *proc_pid_get_link(struct dentry *dentry, |
fceef393 AV |
1567 | struct inode *inode, |
1568 | struct delayed_call *done) | |
1da177e4 | 1569 | { |
408ef013 | 1570 | struct path path; |
1da177e4 LT |
1571 | int error = -EACCES; |
1572 | ||
6b255391 AV |
1573 | if (!dentry) |
1574 | return ERR_PTR(-ECHILD); | |
1575 | ||
778c1144 EB |
1576 | /* Are we allowed to snoop on the tasks file descriptors? */ |
1577 | if (!proc_fd_access_allowed(inode)) | |
1da177e4 | 1578 | goto out; |
1da177e4 | 1579 | |
408ef013 CH |
1580 | error = PROC_I(inode)->op.proc_get_link(dentry, &path); |
1581 | if (error) | |
1582 | goto out; | |
1583 | ||
6e77137b | 1584 | nd_jump_link(&path); |
408ef013 | 1585 | return NULL; |
1da177e4 | 1586 | out: |
008b150a | 1587 | return ERR_PTR(error); |
1da177e4 LT |
1588 | } |
1589 | ||
3dcd25f3 | 1590 | static int do_proc_readlink(struct path *path, char __user *buffer, int buflen) |
1da177e4 | 1591 | { |
e12ba74d | 1592 | char *tmp = (char*)__get_free_page(GFP_TEMPORARY); |
3dcd25f3 | 1593 | char *pathname; |
1da177e4 LT |
1594 | int len; |
1595 | ||
1596 | if (!tmp) | |
1597 | return -ENOMEM; | |
0c28f287 | 1598 | |
7b2a69ba | 1599 | pathname = d_path(path, tmp, PAGE_SIZE); |
3dcd25f3 JB |
1600 | len = PTR_ERR(pathname); |
1601 | if (IS_ERR(pathname)) | |
1da177e4 | 1602 | goto out; |
3dcd25f3 | 1603 | len = tmp + PAGE_SIZE - 1 - pathname; |
1da177e4 LT |
1604 | |
1605 | if (len > buflen) | |
1606 | len = buflen; | |
3dcd25f3 | 1607 | if (copy_to_user(buffer, pathname, len)) |
1da177e4 LT |
1608 | len = -EFAULT; |
1609 | out: | |
1610 | free_page((unsigned long)tmp); | |
1611 | return len; | |
1612 | } | |
1613 | ||
1614 | static int proc_pid_readlink(struct dentry * dentry, char __user * buffer, int buflen) | |
1615 | { | |
1616 | int error = -EACCES; | |
2b0143b5 | 1617 | struct inode *inode = d_inode(dentry); |
3dcd25f3 | 1618 | struct path path; |
1da177e4 | 1619 | |
778c1144 EB |
1620 | /* Are we allowed to snoop on the tasks file descriptors? */ |
1621 | if (!proc_fd_access_allowed(inode)) | |
1da177e4 | 1622 | goto out; |
1da177e4 | 1623 | |
7773fbc5 | 1624 | error = PROC_I(inode)->op.proc_get_link(dentry, &path); |
1da177e4 LT |
1625 | if (error) |
1626 | goto out; | |
1627 | ||
3dcd25f3 JB |
1628 | error = do_proc_readlink(&path, buffer, buflen); |
1629 | path_put(&path); | |
1da177e4 | 1630 | out: |
1da177e4 LT |
1631 | return error; |
1632 | } | |
1633 | ||
faf60af1 | 1634 | const struct inode_operations proc_pid_link_inode_operations = { |
1da177e4 | 1635 | .readlink = proc_pid_readlink, |
6b255391 | 1636 | .get_link = proc_pid_get_link, |
6d76fa58 | 1637 | .setattr = proc_setattr, |
1da177e4 LT |
1638 | }; |
1639 | ||
28a6d671 EB |
1640 | |
1641 | /* building an inode */ | |
1642 | ||
68eb94f1 EB |
1643 | void task_dump_owner(struct task_struct *task, mode_t mode, |
1644 | kuid_t *ruid, kgid_t *rgid) | |
1645 | { | |
1646 | /* Depending on the state of dumpable compute who should own a | |
1647 | * proc file for a task. | |
1648 | */ | |
1649 | const struct cred *cred; | |
1650 | kuid_t uid; | |
1651 | kgid_t gid; | |
1652 | ||
1653 | /* Default to the tasks effective ownership */ | |
1654 | rcu_read_lock(); | |
1655 | cred = __task_cred(task); | |
1656 | uid = cred->euid; | |
1657 | gid = cred->egid; | |
1658 | rcu_read_unlock(); | |
1659 | ||
1660 | /* | |
1661 | * Before the /proc/pid/status file was created the only way to read | |
1662 | * the effective uid of a /process was to stat /proc/pid. Reading | |
1663 | * /proc/pid/status is slow enough that procps and other packages | |
1664 | * kept stating /proc/pid. To keep the rules in /proc simple I have | |
1665 | * made this apply to all per process world readable and executable | |
1666 | * directories. | |
1667 | */ | |
1668 | if (mode != (S_IFDIR|S_IRUGO|S_IXUGO)) { | |
1669 | struct mm_struct *mm; | |
1670 | task_lock(task); | |
1671 | mm = task->mm; | |
1672 | /* Make non-dumpable tasks owned by some root */ | |
1673 | if (mm) { | |
1674 | if (get_dumpable(mm) != SUID_DUMP_USER) { | |
1675 | struct user_namespace *user_ns = mm->user_ns; | |
1676 | ||
1677 | uid = make_kuid(user_ns, 0); | |
1678 | if (!uid_valid(uid)) | |
1679 | uid = GLOBAL_ROOT_UID; | |
1680 | ||
1681 | gid = make_kgid(user_ns, 0); | |
1682 | if (!gid_valid(gid)) | |
1683 | gid = GLOBAL_ROOT_GID; | |
1684 | } | |
1685 | } else { | |
1686 | uid = GLOBAL_ROOT_UID; | |
1687 | gid = GLOBAL_ROOT_GID; | |
1688 | } | |
1689 | task_unlock(task); | |
1690 | } | |
1691 | *ruid = uid; | |
1692 | *rgid = gid; | |
1693 | } | |
1694 | ||
db978da8 AG |
1695 | struct inode *proc_pid_make_inode(struct super_block * sb, |
1696 | struct task_struct *task, umode_t mode) | |
28a6d671 EB |
1697 | { |
1698 | struct inode * inode; | |
1699 | struct proc_inode *ei; | |
1da177e4 | 1700 | |
28a6d671 | 1701 | /* We need a new inode */ |
1da177e4 | 1702 | |
28a6d671 EB |
1703 | inode = new_inode(sb); |
1704 | if (!inode) | |
1705 | goto out; | |
1706 | ||
1707 | /* Common stuff */ | |
1708 | ei = PROC_I(inode); | |
db978da8 | 1709 | inode->i_mode = mode; |
85fe4025 | 1710 | inode->i_ino = get_next_ino(); |
078cd827 | 1711 | inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode); |
28a6d671 EB |
1712 | inode->i_op = &proc_def_inode_operations; |
1713 | ||
1714 | /* | |
1715 | * grab the reference to task. | |
1716 | */ | |
1a657f78 | 1717 | ei->pid = get_task_pid(task, PIDTYPE_PID); |
28a6d671 EB |
1718 | if (!ei->pid) |
1719 | goto out_unlock; | |
1720 | ||
68eb94f1 | 1721 | task_dump_owner(task, 0, &inode->i_uid, &inode->i_gid); |
28a6d671 EB |
1722 | security_task_to_inode(task, inode); |
1723 | ||
1da177e4 | 1724 | out: |
28a6d671 EB |
1725 | return inode; |
1726 | ||
1727 | out_unlock: | |
1728 | iput(inode); | |
1729 | return NULL; | |
1da177e4 LT |
1730 | } |
1731 | ||
a528d35e DH |
1732 | int pid_getattr(const struct path *path, struct kstat *stat, |
1733 | u32 request_mask, unsigned int query_flags) | |
1da177e4 | 1734 | { |
a528d35e | 1735 | struct inode *inode = d_inode(path->dentry); |
28a6d671 | 1736 | struct task_struct *task; |
a528d35e | 1737 | struct pid_namespace *pid = path->dentry->d_sb->s_fs_info; |
c69e8d9c | 1738 | |
28a6d671 | 1739 | generic_fillattr(inode, stat); |
1da177e4 | 1740 | |
28a6d671 | 1741 | rcu_read_lock(); |
dcb0f222 EB |
1742 | stat->uid = GLOBAL_ROOT_UID; |
1743 | stat->gid = GLOBAL_ROOT_GID; | |
28a6d671 EB |
1744 | task = pid_task(proc_pid(inode), PIDTYPE_PID); |
1745 | if (task) { | |
796f571b | 1746 | if (!has_pid_permissions(pid, task, HIDEPID_INVISIBLE)) { |
0499680a VK |
1747 | rcu_read_unlock(); |
1748 | /* | |
1749 | * This doesn't prevent learning whether PID exists, | |
1750 | * it only makes getattr() consistent with readdir(). | |
1751 | */ | |
1752 | return -ENOENT; | |
1753 | } | |
68eb94f1 | 1754 | task_dump_owner(task, inode->i_mode, &stat->uid, &stat->gid); |
1da177e4 | 1755 | } |
28a6d671 | 1756 | rcu_read_unlock(); |
d6e71144 | 1757 | return 0; |
1da177e4 LT |
1758 | } |
1759 | ||
1da177e4 LT |
1760 | /* dentry stuff */ |
1761 | ||
1762 | /* | |
1763 | * Exceptional case: normally we are not allowed to unhash a busy | |
1764 | * directory. In this case, however, we can do it - no aliasing problems | |
1765 | * due to the way we treat inodes. | |
1766 | * | |
1767 | * Rewrite the inode's ownerships here because the owning task may have | |
1768 | * performed a setuid(), etc. | |
99f89551 | 1769 | * |
1da177e4 | 1770 | */ |
0b728e19 | 1771 | int pid_revalidate(struct dentry *dentry, unsigned int flags) |
1da177e4 | 1772 | { |
34286d66 NP |
1773 | struct inode *inode; |
1774 | struct task_struct *task; | |
c69e8d9c | 1775 | |
0b728e19 | 1776 | if (flags & LOOKUP_RCU) |
34286d66 NP |
1777 | return -ECHILD; |
1778 | ||
2b0143b5 | 1779 | inode = d_inode(dentry); |
34286d66 NP |
1780 | task = get_proc_task(inode); |
1781 | ||
99f89551 | 1782 | if (task) { |
68eb94f1 EB |
1783 | task_dump_owner(task, inode->i_mode, &inode->i_uid, &inode->i_gid); |
1784 | ||
9ee8ab9f | 1785 | inode->i_mode &= ~(S_ISUID | S_ISGID); |
1da177e4 | 1786 | security_task_to_inode(task, inode); |
99f89551 | 1787 | put_task_struct(task); |
1da177e4 LT |
1788 | return 1; |
1789 | } | |
1da177e4 LT |
1790 | return 0; |
1791 | } | |
1792 | ||
d855a4b7 ON |
1793 | static inline bool proc_inode_is_dead(struct inode *inode) |
1794 | { | |
1795 | return !proc_pid(inode)->tasks[PIDTYPE_PID].first; | |
1796 | } | |
1797 | ||
1dd704b6 DH |
1798 | int pid_delete_dentry(const struct dentry *dentry) |
1799 | { | |
1800 | /* Is the task we represent dead? | |
1801 | * If so, then don't put the dentry on the lru list, | |
1802 | * kill it immediately. | |
1803 | */ | |
2b0143b5 | 1804 | return proc_inode_is_dead(d_inode(dentry)); |
1dd704b6 DH |
1805 | } |
1806 | ||
6b4e306a | 1807 | const struct dentry_operations pid_dentry_operations = |
28a6d671 EB |
1808 | { |
1809 | .d_revalidate = pid_revalidate, | |
1810 | .d_delete = pid_delete_dentry, | |
1811 | }; | |
1812 | ||
1813 | /* Lookups */ | |
1814 | ||
1c0d04c9 EB |
1815 | /* |
1816 | * Fill a directory entry. | |
1817 | * | |
1818 | * If possible create the dcache entry and derive our inode number and | |
1819 | * file type from dcache entry. | |
1820 | * | |
1821 | * Since all of the proc inode numbers are dynamically generated, the inode | |
1822 | * numbers do not exist until the inode is cache. This means creating the | |
1823 | * the dcache entry in readdir is necessary to keep the inode numbers | |
1824 | * reported by readdir in sync with the inode numbers reported | |
1825 | * by stat. | |
1826 | */ | |
f0c3b509 | 1827 | bool proc_fill_cache(struct file *file, struct dir_context *ctx, |
6b4e306a | 1828 | const char *name, int len, |
c5141e6d | 1829 | instantiate_t instantiate, struct task_struct *task, const void *ptr) |
61a28784 | 1830 | { |
f0c3b509 | 1831 | struct dentry *child, *dir = file->f_path.dentry; |
1df98b8b | 1832 | struct qstr qname = QSTR_INIT(name, len); |
61a28784 | 1833 | struct inode *inode; |
1df98b8b AV |
1834 | unsigned type; |
1835 | ino_t ino; | |
61a28784 | 1836 | |
1df98b8b | 1837 | child = d_hash_and_lookup(dir, &qname); |
61a28784 | 1838 | if (!child) { |
3781764b AV |
1839 | DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq); |
1840 | child = d_alloc_parallel(dir, &qname, &wq); | |
1841 | if (IS_ERR(child)) | |
1df98b8b | 1842 | goto end_instantiate; |
3781764b AV |
1843 | if (d_in_lookup(child)) { |
1844 | int err = instantiate(d_inode(dir), child, task, ptr); | |
1845 | d_lookup_done(child); | |
1846 | if (err < 0) { | |
1847 | dput(child); | |
1848 | goto end_instantiate; | |
1849 | } | |
61a28784 EB |
1850 | } |
1851 | } | |
2b0143b5 | 1852 | inode = d_inode(child); |
147ce699 AV |
1853 | ino = inode->i_ino; |
1854 | type = inode->i_mode >> 12; | |
61a28784 | 1855 | dput(child); |
f0c3b509 | 1856 | return dir_emit(ctx, name, len, ino, type); |
1df98b8b AV |
1857 | |
1858 | end_instantiate: | |
1859 | return dir_emit(ctx, name, len, 1, DT_UNKNOWN); | |
61a28784 EB |
1860 | } |
1861 | ||
640708a2 PE |
1862 | /* |
1863 | * dname_to_vma_addr - maps a dentry name into two unsigned longs | |
1864 | * which represent vma start and end addresses. | |
1865 | */ | |
1866 | static int dname_to_vma_addr(struct dentry *dentry, | |
1867 | unsigned long *start, unsigned long *end) | |
1868 | { | |
1869 | if (sscanf(dentry->d_name.name, "%lx-%lx", start, end) != 2) | |
1870 | return -EINVAL; | |
1871 | ||
1872 | return 0; | |
1873 | } | |
1874 | ||
0b728e19 | 1875 | static int map_files_d_revalidate(struct dentry *dentry, unsigned int flags) |
640708a2 PE |
1876 | { |
1877 | unsigned long vm_start, vm_end; | |
1878 | bool exact_vma_exists = false; | |
1879 | struct mm_struct *mm = NULL; | |
1880 | struct task_struct *task; | |
640708a2 PE |
1881 | struct inode *inode; |
1882 | int status = 0; | |
1883 | ||
0b728e19 | 1884 | if (flags & LOOKUP_RCU) |
640708a2 PE |
1885 | return -ECHILD; |
1886 | ||
2b0143b5 | 1887 | inode = d_inode(dentry); |
640708a2 PE |
1888 | task = get_proc_task(inode); |
1889 | if (!task) | |
1890 | goto out_notask; | |
1891 | ||
caaee623 | 1892 | mm = mm_access(task, PTRACE_MODE_READ_FSCREDS); |
2344bec7 | 1893 | if (IS_ERR_OR_NULL(mm)) |
640708a2 PE |
1894 | goto out; |
1895 | ||
1896 | if (!dname_to_vma_addr(dentry, &vm_start, &vm_end)) { | |
1897 | down_read(&mm->mmap_sem); | |
1898 | exact_vma_exists = !!find_exact_vma(mm, vm_start, vm_end); | |
1899 | up_read(&mm->mmap_sem); | |
1900 | } | |
1901 | ||
1902 | mmput(mm); | |
1903 | ||
1904 | if (exact_vma_exists) { | |
68eb94f1 EB |
1905 | task_dump_owner(task, 0, &inode->i_uid, &inode->i_gid); |
1906 | ||
640708a2 PE |
1907 | security_task_to_inode(task, inode); |
1908 | status = 1; | |
1909 | } | |
1910 | ||
1911 | out: | |
1912 | put_task_struct(task); | |
1913 | ||
1914 | out_notask: | |
640708a2 PE |
1915 | return status; |
1916 | } | |
1917 | ||
1918 | static const struct dentry_operations tid_map_files_dentry_operations = { | |
1919 | .d_revalidate = map_files_d_revalidate, | |
1920 | .d_delete = pid_delete_dentry, | |
1921 | }; | |
1922 | ||
6b255391 | 1923 | static int map_files_get_link(struct dentry *dentry, struct path *path) |
640708a2 PE |
1924 | { |
1925 | unsigned long vm_start, vm_end; | |
1926 | struct vm_area_struct *vma; | |
1927 | struct task_struct *task; | |
1928 | struct mm_struct *mm; | |
1929 | int rc; | |
1930 | ||
1931 | rc = -ENOENT; | |
2b0143b5 | 1932 | task = get_proc_task(d_inode(dentry)); |
640708a2 PE |
1933 | if (!task) |
1934 | goto out; | |
1935 | ||
1936 | mm = get_task_mm(task); | |
1937 | put_task_struct(task); | |
1938 | if (!mm) | |
1939 | goto out; | |
1940 | ||
1941 | rc = dname_to_vma_addr(dentry, &vm_start, &vm_end); | |
1942 | if (rc) | |
1943 | goto out_mmput; | |
1944 | ||
70335abb | 1945 | rc = -ENOENT; |
640708a2 PE |
1946 | down_read(&mm->mmap_sem); |
1947 | vma = find_exact_vma(mm, vm_start, vm_end); | |
1948 | if (vma && vma->vm_file) { | |
1949 | *path = vma->vm_file->f_path; | |
1950 | path_get(path); | |
1951 | rc = 0; | |
1952 | } | |
1953 | up_read(&mm->mmap_sem); | |
1954 | ||
1955 | out_mmput: | |
1956 | mmput(mm); | |
1957 | out: | |
1958 | return rc; | |
1959 | } | |
1960 | ||
1961 | struct map_files_info { | |
7b540d06 | 1962 | fmode_t mode; |
9a87fe0d | 1963 | unsigned int len; |
640708a2 PE |
1964 | unsigned char name[4*sizeof(long)+2]; /* max: %lx-%lx\0 */ |
1965 | }; | |
1966 | ||
bdb4d100 CO |
1967 | /* |
1968 | * Only allow CAP_SYS_ADMIN to follow the links, due to concerns about how the | |
1969 | * symlinks may be used to bypass permissions on ancestor directories in the | |
1970 | * path to the file in question. | |
1971 | */ | |
1972 | static const char * | |
6b255391 | 1973 | proc_map_files_get_link(struct dentry *dentry, |
fceef393 AV |
1974 | struct inode *inode, |
1975 | struct delayed_call *done) | |
bdb4d100 CO |
1976 | { |
1977 | if (!capable(CAP_SYS_ADMIN)) | |
1978 | return ERR_PTR(-EPERM); | |
1979 | ||
fceef393 | 1980 | return proc_pid_get_link(dentry, inode, done); |
bdb4d100 CO |
1981 | } |
1982 | ||
1983 | /* | |
6b255391 | 1984 | * Identical to proc_pid_link_inode_operations except for get_link() |
bdb4d100 CO |
1985 | */ |
1986 | static const struct inode_operations proc_map_files_link_inode_operations = { | |
1987 | .readlink = proc_pid_readlink, | |
6b255391 | 1988 | .get_link = proc_map_files_get_link, |
bdb4d100 CO |
1989 | .setattr = proc_setattr, |
1990 | }; | |
1991 | ||
c52a47ac | 1992 | static int |
640708a2 PE |
1993 | proc_map_files_instantiate(struct inode *dir, struct dentry *dentry, |
1994 | struct task_struct *task, const void *ptr) | |
1995 | { | |
7b540d06 | 1996 | fmode_t mode = (fmode_t)(unsigned long)ptr; |
640708a2 PE |
1997 | struct proc_inode *ei; |
1998 | struct inode *inode; | |
1999 | ||
db978da8 AG |
2000 | inode = proc_pid_make_inode(dir->i_sb, task, S_IFLNK | |
2001 | ((mode & FMODE_READ ) ? S_IRUSR : 0) | | |
2002 | ((mode & FMODE_WRITE) ? S_IWUSR : 0)); | |
640708a2 | 2003 | if (!inode) |
c52a47ac | 2004 | return -ENOENT; |
640708a2 PE |
2005 | |
2006 | ei = PROC_I(inode); | |
6b255391 | 2007 | ei->op.proc_get_link = map_files_get_link; |
640708a2 | 2008 | |
bdb4d100 | 2009 | inode->i_op = &proc_map_files_link_inode_operations; |
640708a2 | 2010 | inode->i_size = 64; |
640708a2 PE |
2011 | |
2012 | d_set_d_op(dentry, &tid_map_files_dentry_operations); | |
2013 | d_add(dentry, inode); | |
2014 | ||
c52a47ac | 2015 | return 0; |
640708a2 PE |
2016 | } |
2017 | ||
2018 | static struct dentry *proc_map_files_lookup(struct inode *dir, | |
00cd8dd3 | 2019 | struct dentry *dentry, unsigned int flags) |
640708a2 PE |
2020 | { |
2021 | unsigned long vm_start, vm_end; | |
2022 | struct vm_area_struct *vma; | |
2023 | struct task_struct *task; | |
c52a47ac | 2024 | int result; |
640708a2 PE |
2025 | struct mm_struct *mm; |
2026 | ||
c52a47ac | 2027 | result = -ENOENT; |
640708a2 PE |
2028 | task = get_proc_task(dir); |
2029 | if (!task) | |
2030 | goto out; | |
2031 | ||
c52a47ac | 2032 | result = -EACCES; |
caaee623 | 2033 | if (!ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS)) |
640708a2 PE |
2034 | goto out_put_task; |
2035 | ||
c52a47ac | 2036 | result = -ENOENT; |
640708a2 | 2037 | if (dname_to_vma_addr(dentry, &vm_start, &vm_end)) |
eb94cd96 | 2038 | goto out_put_task; |
640708a2 PE |
2039 | |
2040 | mm = get_task_mm(task); | |
2041 | if (!mm) | |
eb94cd96 | 2042 | goto out_put_task; |
640708a2 PE |
2043 | |
2044 | down_read(&mm->mmap_sem); | |
2045 | vma = find_exact_vma(mm, vm_start, vm_end); | |
2046 | if (!vma) | |
2047 | goto out_no_vma; | |
2048 | ||
05f56484 SK |
2049 | if (vma->vm_file) |
2050 | result = proc_map_files_instantiate(dir, dentry, task, | |
2051 | (void *)(unsigned long)vma->vm_file->f_mode); | |
640708a2 PE |
2052 | |
2053 | out_no_vma: | |
2054 | up_read(&mm->mmap_sem); | |
2055 | mmput(mm); | |
640708a2 PE |
2056 | out_put_task: |
2057 | put_task_struct(task); | |
2058 | out: | |
c52a47ac | 2059 | return ERR_PTR(result); |
640708a2 PE |
2060 | } |
2061 | ||
2062 | static const struct inode_operations proc_map_files_inode_operations = { | |
2063 | .lookup = proc_map_files_lookup, | |
2064 | .permission = proc_fd_permission, | |
2065 | .setattr = proc_setattr, | |
2066 | }; | |
2067 | ||
2068 | static int | |
f0c3b509 | 2069 | proc_map_files_readdir(struct file *file, struct dir_context *ctx) |
640708a2 | 2070 | { |
640708a2 PE |
2071 | struct vm_area_struct *vma; |
2072 | struct task_struct *task; | |
2073 | struct mm_struct *mm; | |
f0c3b509 AV |
2074 | unsigned long nr_files, pos, i; |
2075 | struct flex_array *fa = NULL; | |
2076 | struct map_files_info info; | |
2077 | struct map_files_info *p; | |
640708a2 PE |
2078 | int ret; |
2079 | ||
640708a2 | 2080 | ret = -ENOENT; |
f0c3b509 | 2081 | task = get_proc_task(file_inode(file)); |
640708a2 PE |
2082 | if (!task) |
2083 | goto out; | |
2084 | ||
2085 | ret = -EACCES; | |
caaee623 | 2086 | if (!ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS)) |
640708a2 PE |
2087 | goto out_put_task; |
2088 | ||
2089 | ret = 0; | |
f0c3b509 AV |
2090 | if (!dir_emit_dots(file, ctx)) |
2091 | goto out_put_task; | |
640708a2 | 2092 | |
f0c3b509 AV |
2093 | mm = get_task_mm(task); |
2094 | if (!mm) | |
2095 | goto out_put_task; | |
2096 | down_read(&mm->mmap_sem); | |
640708a2 | 2097 | |
f0c3b509 | 2098 | nr_files = 0; |
640708a2 | 2099 | |
f0c3b509 AV |
2100 | /* |
2101 | * We need two passes here: | |
2102 | * | |
2103 | * 1) Collect vmas of mapped files with mmap_sem taken | |
2104 | * 2) Release mmap_sem and instantiate entries | |
2105 | * | |
2106 | * otherwise we get lockdep complained, since filldir() | |
2107 | * routine might require mmap_sem taken in might_fault(). | |
2108 | */ | |
640708a2 | 2109 | |
f0c3b509 AV |
2110 | for (vma = mm->mmap, pos = 2; vma; vma = vma->vm_next) { |
2111 | if (vma->vm_file && ++pos > ctx->pos) | |
2112 | nr_files++; | |
2113 | } | |
2114 | ||
2115 | if (nr_files) { | |
2116 | fa = flex_array_alloc(sizeof(info), nr_files, | |
2117 | GFP_KERNEL); | |
2118 | if (!fa || flex_array_prealloc(fa, 0, nr_files, | |
2119 | GFP_KERNEL)) { | |
2120 | ret = -ENOMEM; | |
2121 | if (fa) | |
2122 | flex_array_free(fa); | |
2123 | up_read(&mm->mmap_sem); | |
2124 | mmput(mm); | |
2125 | goto out_put_task; | |
640708a2 | 2126 | } |
f0c3b509 AV |
2127 | for (i = 0, vma = mm->mmap, pos = 2; vma; |
2128 | vma = vma->vm_next) { | |
2129 | if (!vma->vm_file) | |
2130 | continue; | |
2131 | if (++pos <= ctx->pos) | |
2132 | continue; | |
2133 | ||
2134 | info.mode = vma->vm_file->f_mode; | |
2135 | info.len = snprintf(info.name, | |
2136 | sizeof(info.name), "%lx-%lx", | |
2137 | vma->vm_start, vma->vm_end); | |
2138 | if (flex_array_put(fa, i++, &info, GFP_KERNEL)) | |
2139 | BUG(); | |
640708a2 | 2140 | } |
640708a2 | 2141 | } |
f0c3b509 AV |
2142 | up_read(&mm->mmap_sem); |
2143 | ||
2144 | for (i = 0; i < nr_files; i++) { | |
2145 | p = flex_array_get(fa, i); | |
2146 | if (!proc_fill_cache(file, ctx, | |
2147 | p->name, p->len, | |
2148 | proc_map_files_instantiate, | |
2149 | task, | |
2150 | (void *)(unsigned long)p->mode)) | |
2151 | break; | |
2152 | ctx->pos++; | |
640708a2 | 2153 | } |
f0c3b509 AV |
2154 | if (fa) |
2155 | flex_array_free(fa); | |
2156 | mmput(mm); | |
640708a2 | 2157 | |
640708a2 PE |
2158 | out_put_task: |
2159 | put_task_struct(task); | |
2160 | out: | |
2161 | return ret; | |
2162 | } | |
2163 | ||
2164 | static const struct file_operations proc_map_files_operations = { | |
2165 | .read = generic_read_dir, | |
f50752ea AV |
2166 | .iterate_shared = proc_map_files_readdir, |
2167 | .llseek = generic_file_llseek, | |
640708a2 PE |
2168 | }; |
2169 | ||
b18b6a9c | 2170 | #if defined(CONFIG_CHECKPOINT_RESTORE) && defined(CONFIG_POSIX_TIMERS) |
48f6a7a5 PE |
2171 | struct timers_private { |
2172 | struct pid *pid; | |
2173 | struct task_struct *task; | |
2174 | struct sighand_struct *sighand; | |
57b8015e | 2175 | struct pid_namespace *ns; |
48f6a7a5 PE |
2176 | unsigned long flags; |
2177 | }; | |
2178 | ||
2179 | static void *timers_start(struct seq_file *m, loff_t *pos) | |
2180 | { | |
2181 | struct timers_private *tp = m->private; | |
2182 | ||
2183 | tp->task = get_pid_task(tp->pid, PIDTYPE_PID); | |
2184 | if (!tp->task) | |
2185 | return ERR_PTR(-ESRCH); | |
2186 | ||
2187 | tp->sighand = lock_task_sighand(tp->task, &tp->flags); | |
2188 | if (!tp->sighand) | |
2189 | return ERR_PTR(-ESRCH); | |
2190 | ||
2191 | return seq_list_start(&tp->task->signal->posix_timers, *pos); | |
2192 | } | |
2193 | ||
2194 | static void *timers_next(struct seq_file *m, void *v, loff_t *pos) | |
2195 | { | |
2196 | struct timers_private *tp = m->private; | |
2197 | return seq_list_next(v, &tp->task->signal->posix_timers, pos); | |
2198 | } | |
2199 | ||
2200 | static void timers_stop(struct seq_file *m, void *v) | |
2201 | { | |
2202 | struct timers_private *tp = m->private; | |
2203 | ||
2204 | if (tp->sighand) { | |
2205 | unlock_task_sighand(tp->task, &tp->flags); | |
2206 | tp->sighand = NULL; | |
2207 | } | |
2208 | ||
2209 | if (tp->task) { | |
2210 | put_task_struct(tp->task); | |
2211 | tp->task = NULL; | |
2212 | } | |
2213 | } | |
2214 | ||
2215 | static int show_timer(struct seq_file *m, void *v) | |
2216 | { | |
2217 | struct k_itimer *timer; | |
57b8015e PE |
2218 | struct timers_private *tp = m->private; |
2219 | int notify; | |
cedbccab | 2220 | static const char * const nstr[] = { |
57b8015e PE |
2221 | [SIGEV_SIGNAL] = "signal", |
2222 | [SIGEV_NONE] = "none", | |
2223 | [SIGEV_THREAD] = "thread", | |
2224 | }; | |
48f6a7a5 PE |
2225 | |
2226 | timer = list_entry((struct list_head *)v, struct k_itimer, list); | |
57b8015e PE |
2227 | notify = timer->it_sigev_notify; |
2228 | ||
48f6a7a5 | 2229 | seq_printf(m, "ID: %d\n", timer->it_id); |
25ce3191 JP |
2230 | seq_printf(m, "signal: %d/%p\n", |
2231 | timer->sigq->info.si_signo, | |
2232 | timer->sigq->info.si_value.sival_ptr); | |
57b8015e | 2233 | seq_printf(m, "notify: %s/%s.%d\n", |
25ce3191 JP |
2234 | nstr[notify & ~SIGEV_THREAD_ID], |
2235 | (notify & SIGEV_THREAD_ID) ? "tid" : "pid", | |
2236 | pid_nr_ns(timer->it_pid, tp->ns)); | |
15ef0298 | 2237 | seq_printf(m, "ClockID: %d\n", timer->it_clock); |
48f6a7a5 PE |
2238 | |
2239 | return 0; | |
2240 | } | |
2241 | ||
2242 | static const struct seq_operations proc_timers_seq_ops = { | |
2243 | .start = timers_start, | |
2244 | .next = timers_next, | |
2245 | .stop = timers_stop, | |
2246 | .show = show_timer, | |
2247 | }; | |
2248 | ||
2249 | static int proc_timers_open(struct inode *inode, struct file *file) | |
2250 | { | |
2251 | struct timers_private *tp; | |
2252 | ||
2253 | tp = __seq_open_private(file, &proc_timers_seq_ops, | |
2254 | sizeof(struct timers_private)); | |
2255 | if (!tp) | |
2256 | return -ENOMEM; | |
2257 | ||
2258 | tp->pid = proc_pid(inode); | |
57b8015e | 2259 | tp->ns = inode->i_sb->s_fs_info; |
48f6a7a5 PE |
2260 | return 0; |
2261 | } | |
2262 | ||
2263 | static const struct file_operations proc_timers_operations = { | |
2264 | .open = proc_timers_open, | |
2265 | .read = seq_read, | |
2266 | .llseek = seq_lseek, | |
2267 | .release = seq_release_private, | |
2268 | }; | |
b5946bea | 2269 | #endif |
640708a2 | 2270 | |
5de23d43 JS |
2271 | static ssize_t timerslack_ns_write(struct file *file, const char __user *buf, |
2272 | size_t count, loff_t *offset) | |
2273 | { | |
2274 | struct inode *inode = file_inode(file); | |
2275 | struct task_struct *p; | |
2276 | u64 slack_ns; | |
2277 | int err; | |
2278 | ||
2279 | err = kstrtoull_from_user(buf, count, 10, &slack_ns); | |
2280 | if (err < 0) | |
2281 | return err; | |
2282 | ||
2283 | p = get_proc_task(inode); | |
2284 | if (!p) | |
2285 | return -ESRCH; | |
2286 | ||
4b2bd5fe JS |
2287 | if (p != current) { |
2288 | if (!capable(CAP_SYS_NICE)) { | |
2289 | count = -EPERM; | |
2290 | goto out; | |
2291 | } | |
5de23d43 | 2292 | |
4b2bd5fe JS |
2293 | err = security_task_setscheduler(p); |
2294 | if (err) { | |
2295 | count = err; | |
2296 | goto out; | |
2297 | } | |
904763e1 JS |
2298 | } |
2299 | ||
7abbaf94 JS |
2300 | task_lock(p); |
2301 | if (slack_ns == 0) | |
2302 | p->timer_slack_ns = p->default_timer_slack_ns; | |
2303 | else | |
2304 | p->timer_slack_ns = slack_ns; | |
2305 | task_unlock(p); | |
2306 | ||
2307 | out: | |
5de23d43 JS |
2308 | put_task_struct(p); |
2309 | ||
2310 | return count; | |
2311 | } | |
2312 | ||
2313 | static int timerslack_ns_show(struct seq_file *m, void *v) | |
2314 | { | |
2315 | struct inode *inode = m->private; | |
2316 | struct task_struct *p; | |
7abbaf94 | 2317 | int err = 0; |
5de23d43 JS |
2318 | |
2319 | p = get_proc_task(inode); | |
2320 | if (!p) | |
2321 | return -ESRCH; | |
2322 | ||
4b2bd5fe | 2323 | if (p != current) { |
5de23d43 | 2324 | |
4b2bd5fe JS |
2325 | if (!capable(CAP_SYS_NICE)) { |
2326 | err = -EPERM; | |
2327 | goto out; | |
2328 | } | |
2329 | err = security_task_getscheduler(p); | |
2330 | if (err) | |
2331 | goto out; | |
2332 | } | |
904763e1 | 2333 | |
7abbaf94 JS |
2334 | task_lock(p); |
2335 | seq_printf(m, "%llu\n", p->timer_slack_ns); | |
2336 | task_unlock(p); | |
2337 | ||
2338 | out: | |
5de23d43 JS |
2339 | put_task_struct(p); |
2340 | ||
2341 | return err; | |
2342 | } | |
2343 | ||
2344 | static int timerslack_ns_open(struct inode *inode, struct file *filp) | |
2345 | { | |
2346 | return single_open(filp, timerslack_ns_show, inode); | |
2347 | } | |
2348 | ||
2349 | static const struct file_operations proc_pid_set_timerslack_ns_operations = { | |
2350 | .open = timerslack_ns_open, | |
2351 | .read = seq_read, | |
2352 | .write = timerslack_ns_write, | |
2353 | .llseek = seq_lseek, | |
2354 | .release = single_release, | |
2355 | }; | |
2356 | ||
c52a47ac | 2357 | static int proc_pident_instantiate(struct inode *dir, |
c5141e6d | 2358 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
444ceed8 | 2359 | { |
c5141e6d | 2360 | const struct pid_entry *p = ptr; |
444ceed8 EB |
2361 | struct inode *inode; |
2362 | struct proc_inode *ei; | |
444ceed8 | 2363 | |
db978da8 | 2364 | inode = proc_pid_make_inode(dir->i_sb, task, p->mode); |
444ceed8 EB |
2365 | if (!inode) |
2366 | goto out; | |
2367 | ||
2368 | ei = PROC_I(inode); | |
444ceed8 | 2369 | if (S_ISDIR(inode->i_mode)) |
bfe86848 | 2370 | set_nlink(inode, 2); /* Use getattr to fix if necessary */ |
444ceed8 EB |
2371 | if (p->iop) |
2372 | inode->i_op = p->iop; | |
2373 | if (p->fop) | |
2374 | inode->i_fop = p->fop; | |
2375 | ei->op = p->op; | |
fb045adb | 2376 | d_set_d_op(dentry, &pid_dentry_operations); |
444ceed8 EB |
2377 | d_add(dentry, inode); |
2378 | /* Close the race of the process dying before we return the dentry */ | |
0b728e19 | 2379 | if (pid_revalidate(dentry, 0)) |
c52a47ac | 2380 | return 0; |
444ceed8 | 2381 | out: |
c52a47ac | 2382 | return -ENOENT; |
444ceed8 EB |
2383 | } |
2384 | ||
1da177e4 LT |
2385 | static struct dentry *proc_pident_lookup(struct inode *dir, |
2386 | struct dentry *dentry, | |
c5141e6d | 2387 | const struct pid_entry *ents, |
7bcd6b0e | 2388 | unsigned int nents) |
1da177e4 | 2389 | { |
c52a47ac | 2390 | int error; |
99f89551 | 2391 | struct task_struct *task = get_proc_task(dir); |
c5141e6d | 2392 | const struct pid_entry *p, *last; |
1da177e4 | 2393 | |
c52a47ac | 2394 | error = -ENOENT; |
1da177e4 | 2395 | |
99f89551 EB |
2396 | if (!task) |
2397 | goto out_no_task; | |
1da177e4 | 2398 | |
20cdc894 EB |
2399 | /* |
2400 | * Yes, it does not scale. And it should not. Don't add | |
2401 | * new entries into /proc/<tgid>/ without very good reasons. | |
2402 | */ | |
bac5f5d5 AD |
2403 | last = &ents[nents]; |
2404 | for (p = ents; p < last; p++) { | |
1da177e4 LT |
2405 | if (p->len != dentry->d_name.len) |
2406 | continue; | |
2407 | if (!memcmp(dentry->d_name.name, p->name, p->len)) | |
2408 | break; | |
2409 | } | |
bac5f5d5 | 2410 | if (p >= last) |
1da177e4 LT |
2411 | goto out; |
2412 | ||
444ceed8 | 2413 | error = proc_pident_instantiate(dir, dentry, task, p); |
1da177e4 | 2414 | out: |
99f89551 EB |
2415 | put_task_struct(task); |
2416 | out_no_task: | |
c52a47ac | 2417 | return ERR_PTR(error); |
1da177e4 LT |
2418 | } |
2419 | ||
f0c3b509 | 2420 | static int proc_pident_readdir(struct file *file, struct dir_context *ctx, |
c5141e6d | 2421 | const struct pid_entry *ents, unsigned int nents) |
28a6d671 | 2422 | { |
f0c3b509 AV |
2423 | struct task_struct *task = get_proc_task(file_inode(file)); |
2424 | const struct pid_entry *p; | |
28a6d671 | 2425 | |
28a6d671 | 2426 | if (!task) |
f0c3b509 | 2427 | return -ENOENT; |
28a6d671 | 2428 | |
f0c3b509 AV |
2429 | if (!dir_emit_dots(file, ctx)) |
2430 | goto out; | |
2431 | ||
2432 | if (ctx->pos >= nents + 2) | |
2433 | goto out; | |
28a6d671 | 2434 | |
bac5f5d5 | 2435 | for (p = ents + (ctx->pos - 2); p < ents + nents; p++) { |
f0c3b509 AV |
2436 | if (!proc_fill_cache(file, ctx, p->name, p->len, |
2437 | proc_pident_instantiate, task, p)) | |
2438 | break; | |
2439 | ctx->pos++; | |
2440 | } | |
28a6d671 | 2441 | out: |
61a28784 | 2442 | put_task_struct(task); |
f0c3b509 | 2443 | return 0; |
1da177e4 LT |
2444 | } |
2445 | ||
28a6d671 EB |
2446 | #ifdef CONFIG_SECURITY |
2447 | static ssize_t proc_pid_attr_read(struct file * file, char __user * buf, | |
2448 | size_t count, loff_t *ppos) | |
2449 | { | |
496ad9aa | 2450 | struct inode * inode = file_inode(file); |
04ff9708 | 2451 | char *p = NULL; |
28a6d671 EB |
2452 | ssize_t length; |
2453 | struct task_struct *task = get_proc_task(inode); | |
2454 | ||
28a6d671 | 2455 | if (!task) |
04ff9708 | 2456 | return -ESRCH; |
28a6d671 EB |
2457 | |
2458 | length = security_getprocattr(task, | |
2fddfeef | 2459 | (char*)file->f_path.dentry->d_name.name, |
04ff9708 | 2460 | &p); |
28a6d671 | 2461 | put_task_struct(task); |
04ff9708 AV |
2462 | if (length > 0) |
2463 | length = simple_read_from_buffer(buf, count, ppos, p, length); | |
2464 | kfree(p); | |
28a6d671 | 2465 | return length; |
1da177e4 LT |
2466 | } |
2467 | ||
28a6d671 EB |
2468 | static ssize_t proc_pid_attr_write(struct file * file, const char __user * buf, |
2469 | size_t count, loff_t *ppos) | |
2470 | { | |
496ad9aa | 2471 | struct inode * inode = file_inode(file); |
bb646cdb | 2472 | void *page; |
28a6d671 EB |
2473 | ssize_t length; |
2474 | struct task_struct *task = get_proc_task(inode); | |
2475 | ||
2476 | length = -ESRCH; | |
2477 | if (!task) | |
2478 | goto out_no_task; | |
b21507e2 SS |
2479 | |
2480 | /* A task may only write its own attributes. */ | |
2481 | length = -EACCES; | |
2482 | if (current != task) | |
2483 | goto out; | |
2484 | ||
28a6d671 EB |
2485 | if (count > PAGE_SIZE) |
2486 | count = PAGE_SIZE; | |
2487 | ||
2488 | /* No partial writes. */ | |
2489 | length = -EINVAL; | |
2490 | if (*ppos != 0) | |
2491 | goto out; | |
2492 | ||
bb646cdb AV |
2493 | page = memdup_user(buf, count); |
2494 | if (IS_ERR(page)) { | |
2495 | length = PTR_ERR(page); | |
28a6d671 | 2496 | goto out; |
bb646cdb | 2497 | } |
28a6d671 | 2498 | |
107db7c7 | 2499 | /* Guard against adverse ptrace interaction */ |
b21507e2 | 2500 | length = mutex_lock_interruptible(¤t->signal->cred_guard_mutex); |
107db7c7 DH |
2501 | if (length < 0) |
2502 | goto out_free; | |
2503 | ||
b21507e2 | 2504 | length = security_setprocattr(file->f_path.dentry->d_name.name, |
bb646cdb | 2505 | page, count); |
b21507e2 | 2506 | mutex_unlock(¤t->signal->cred_guard_mutex); |
28a6d671 | 2507 | out_free: |
bb646cdb | 2508 | kfree(page); |
28a6d671 EB |
2509 | out: |
2510 | put_task_struct(task); | |
2511 | out_no_task: | |
2512 | return length; | |
2513 | } | |
2514 | ||
00977a59 | 2515 | static const struct file_operations proc_pid_attr_operations = { |
28a6d671 EB |
2516 | .read = proc_pid_attr_read, |
2517 | .write = proc_pid_attr_write, | |
87df8424 | 2518 | .llseek = generic_file_llseek, |
28a6d671 EB |
2519 | }; |
2520 | ||
c5141e6d | 2521 | static const struct pid_entry attr_dir_stuff[] = { |
631f9c18 AD |
2522 | REG("current", S_IRUGO|S_IWUGO, proc_pid_attr_operations), |
2523 | REG("prev", S_IRUGO, proc_pid_attr_operations), | |
2524 | REG("exec", S_IRUGO|S_IWUGO, proc_pid_attr_operations), | |
2525 | REG("fscreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations), | |
2526 | REG("keycreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations), | |
2527 | REG("sockcreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations), | |
28a6d671 EB |
2528 | }; |
2529 | ||
f0c3b509 | 2530 | static int proc_attr_dir_readdir(struct file *file, struct dir_context *ctx) |
28a6d671 | 2531 | { |
f0c3b509 AV |
2532 | return proc_pident_readdir(file, ctx, |
2533 | attr_dir_stuff, ARRAY_SIZE(attr_dir_stuff)); | |
28a6d671 EB |
2534 | } |
2535 | ||
00977a59 | 2536 | static const struct file_operations proc_attr_dir_operations = { |
1da177e4 | 2537 | .read = generic_read_dir, |
f50752ea AV |
2538 | .iterate_shared = proc_attr_dir_readdir, |
2539 | .llseek = generic_file_llseek, | |
1da177e4 LT |
2540 | }; |
2541 | ||
72d9dcfc | 2542 | static struct dentry *proc_attr_dir_lookup(struct inode *dir, |
00cd8dd3 | 2543 | struct dentry *dentry, unsigned int flags) |
28a6d671 | 2544 | { |
7bcd6b0e EB |
2545 | return proc_pident_lookup(dir, dentry, |
2546 | attr_dir_stuff, ARRAY_SIZE(attr_dir_stuff)); | |
28a6d671 EB |
2547 | } |
2548 | ||
c5ef1c42 | 2549 | static const struct inode_operations proc_attr_dir_inode_operations = { |
72d9dcfc | 2550 | .lookup = proc_attr_dir_lookup, |
99f89551 | 2551 | .getattr = pid_getattr, |
6d76fa58 | 2552 | .setattr = proc_setattr, |
1da177e4 LT |
2553 | }; |
2554 | ||
28a6d671 EB |
2555 | #endif |
2556 | ||
698ba7b5 | 2557 | #ifdef CONFIG_ELF_CORE |
3cb4a0bb KH |
2558 | static ssize_t proc_coredump_filter_read(struct file *file, char __user *buf, |
2559 | size_t count, loff_t *ppos) | |
2560 | { | |
496ad9aa | 2561 | struct task_struct *task = get_proc_task(file_inode(file)); |
3cb4a0bb KH |
2562 | struct mm_struct *mm; |
2563 | char buffer[PROC_NUMBUF]; | |
2564 | size_t len; | |
2565 | int ret; | |
2566 | ||
2567 | if (!task) | |
2568 | return -ESRCH; | |
2569 | ||
2570 | ret = 0; | |
2571 | mm = get_task_mm(task); | |
2572 | if (mm) { | |
2573 | len = snprintf(buffer, sizeof(buffer), "%08lx\n", | |
2574 | ((mm->flags & MMF_DUMP_FILTER_MASK) >> | |
2575 | MMF_DUMP_FILTER_SHIFT)); | |
2576 | mmput(mm); | |
2577 | ret = simple_read_from_buffer(buf, count, ppos, buffer, len); | |
2578 | } | |
2579 | ||
2580 | put_task_struct(task); | |
2581 | ||
2582 | return ret; | |
2583 | } | |
2584 | ||
2585 | static ssize_t proc_coredump_filter_write(struct file *file, | |
2586 | const char __user *buf, | |
2587 | size_t count, | |
2588 | loff_t *ppos) | |
2589 | { | |
2590 | struct task_struct *task; | |
2591 | struct mm_struct *mm; | |
3cb4a0bb KH |
2592 | unsigned int val; |
2593 | int ret; | |
2594 | int i; | |
2595 | unsigned long mask; | |
2596 | ||
774636e1 AD |
2597 | ret = kstrtouint_from_user(buf, count, 0, &val); |
2598 | if (ret < 0) | |
2599 | return ret; | |
3cb4a0bb KH |
2600 | |
2601 | ret = -ESRCH; | |
496ad9aa | 2602 | task = get_proc_task(file_inode(file)); |
3cb4a0bb KH |
2603 | if (!task) |
2604 | goto out_no_task; | |
2605 | ||
3cb4a0bb KH |
2606 | mm = get_task_mm(task); |
2607 | if (!mm) | |
2608 | goto out_no_mm; | |
41a0c249 | 2609 | ret = 0; |
3cb4a0bb KH |
2610 | |
2611 | for (i = 0, mask = 1; i < MMF_DUMP_FILTER_BITS; i++, mask <<= 1) { | |
2612 | if (val & mask) | |
2613 | set_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags); | |
2614 | else | |
2615 | clear_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags); | |
2616 | } | |
2617 | ||
2618 | mmput(mm); | |
2619 | out_no_mm: | |
2620 | put_task_struct(task); | |
2621 | out_no_task: | |
774636e1 AD |
2622 | if (ret < 0) |
2623 | return ret; | |
2624 | return count; | |
3cb4a0bb KH |
2625 | } |
2626 | ||
2627 | static const struct file_operations proc_coredump_filter_operations = { | |
2628 | .read = proc_coredump_filter_read, | |
2629 | .write = proc_coredump_filter_write, | |
87df8424 | 2630 | .llseek = generic_file_llseek, |
3cb4a0bb KH |
2631 | }; |
2632 | #endif | |
2633 | ||
aba76fdb | 2634 | #ifdef CONFIG_TASK_IO_ACCOUNTING |
19aadc98 | 2635 | static int do_io_accounting(struct task_struct *task, struct seq_file *m, int whole) |
297c5d92 | 2636 | { |
940389b8 | 2637 | struct task_io_accounting acct = task->ioac; |
5995477a | 2638 | unsigned long flags; |
293eb1e7 | 2639 | int result; |
5995477a | 2640 | |
293eb1e7 VK |
2641 | result = mutex_lock_killable(&task->signal->cred_guard_mutex); |
2642 | if (result) | |
2643 | return result; | |
2644 | ||
caaee623 | 2645 | if (!ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS)) { |
293eb1e7 VK |
2646 | result = -EACCES; |
2647 | goto out_unlock; | |
2648 | } | |
1d1221f3 | 2649 | |
5995477a AR |
2650 | if (whole && lock_task_sighand(task, &flags)) { |
2651 | struct task_struct *t = task; | |
2652 | ||
2653 | task_io_accounting_add(&acct, &task->signal->ioac); | |
2654 | while_each_thread(task, t) | |
2655 | task_io_accounting_add(&acct, &t->ioac); | |
2656 | ||
2657 | unlock_task_sighand(task, &flags); | |
297c5d92 | 2658 | } |
25ce3191 JP |
2659 | seq_printf(m, |
2660 | "rchar: %llu\n" | |
2661 | "wchar: %llu\n" | |
2662 | "syscr: %llu\n" | |
2663 | "syscw: %llu\n" | |
2664 | "read_bytes: %llu\n" | |
2665 | "write_bytes: %llu\n" | |
2666 | "cancelled_write_bytes: %llu\n", | |
2667 | (unsigned long long)acct.rchar, | |
2668 | (unsigned long long)acct.wchar, | |
2669 | (unsigned long long)acct.syscr, | |
2670 | (unsigned long long)acct.syscw, | |
2671 | (unsigned long long)acct.read_bytes, | |
2672 | (unsigned long long)acct.write_bytes, | |
2673 | (unsigned long long)acct.cancelled_write_bytes); | |
2674 | result = 0; | |
2675 | ||
293eb1e7 VK |
2676 | out_unlock: |
2677 | mutex_unlock(&task->signal->cred_guard_mutex); | |
2678 | return result; | |
297c5d92 AR |
2679 | } |
2680 | ||
19aadc98 AD |
2681 | static int proc_tid_io_accounting(struct seq_file *m, struct pid_namespace *ns, |
2682 | struct pid *pid, struct task_struct *task) | |
297c5d92 | 2683 | { |
19aadc98 | 2684 | return do_io_accounting(task, m, 0); |
aba76fdb | 2685 | } |
297c5d92 | 2686 | |
19aadc98 AD |
2687 | static int proc_tgid_io_accounting(struct seq_file *m, struct pid_namespace *ns, |
2688 | struct pid *pid, struct task_struct *task) | |
297c5d92 | 2689 | { |
19aadc98 | 2690 | return do_io_accounting(task, m, 1); |
297c5d92 AR |
2691 | } |
2692 | #endif /* CONFIG_TASK_IO_ACCOUNTING */ | |
aba76fdb | 2693 | |
22d917d8 EB |
2694 | #ifdef CONFIG_USER_NS |
2695 | static int proc_id_map_open(struct inode *inode, struct file *file, | |
ccf94f1b | 2696 | const struct seq_operations *seq_ops) |
22d917d8 EB |
2697 | { |
2698 | struct user_namespace *ns = NULL; | |
2699 | struct task_struct *task; | |
2700 | struct seq_file *seq; | |
2701 | int ret = -EINVAL; | |
2702 | ||
2703 | task = get_proc_task(inode); | |
2704 | if (task) { | |
2705 | rcu_read_lock(); | |
2706 | ns = get_user_ns(task_cred_xxx(task, user_ns)); | |
2707 | rcu_read_unlock(); | |
2708 | put_task_struct(task); | |
2709 | } | |
2710 | if (!ns) | |
2711 | goto err; | |
2712 | ||
2713 | ret = seq_open(file, seq_ops); | |
2714 | if (ret) | |
2715 | goto err_put_ns; | |
2716 | ||
2717 | seq = file->private_data; | |
2718 | seq->private = ns; | |
2719 | ||
2720 | return 0; | |
2721 | err_put_ns: | |
2722 | put_user_ns(ns); | |
2723 | err: | |
2724 | return ret; | |
2725 | } | |
2726 | ||
2727 | static int proc_id_map_release(struct inode *inode, struct file *file) | |
2728 | { | |
2729 | struct seq_file *seq = file->private_data; | |
2730 | struct user_namespace *ns = seq->private; | |
2731 | put_user_ns(ns); | |
2732 | return seq_release(inode, file); | |
2733 | } | |
2734 | ||
2735 | static int proc_uid_map_open(struct inode *inode, struct file *file) | |
2736 | { | |
2737 | return proc_id_map_open(inode, file, &proc_uid_seq_operations); | |
2738 | } | |
2739 | ||
2740 | static int proc_gid_map_open(struct inode *inode, struct file *file) | |
2741 | { | |
2742 | return proc_id_map_open(inode, file, &proc_gid_seq_operations); | |
2743 | } | |
2744 | ||
f76d207a EB |
2745 | static int proc_projid_map_open(struct inode *inode, struct file *file) |
2746 | { | |
2747 | return proc_id_map_open(inode, file, &proc_projid_seq_operations); | |
2748 | } | |
2749 | ||
22d917d8 EB |
2750 | static const struct file_operations proc_uid_map_operations = { |
2751 | .open = proc_uid_map_open, | |
2752 | .write = proc_uid_map_write, | |
2753 | .read = seq_read, | |
2754 | .llseek = seq_lseek, | |
2755 | .release = proc_id_map_release, | |
2756 | }; | |
2757 | ||
2758 | static const struct file_operations proc_gid_map_operations = { | |
2759 | .open = proc_gid_map_open, | |
2760 | .write = proc_gid_map_write, | |
2761 | .read = seq_read, | |
2762 | .llseek = seq_lseek, | |
2763 | .release = proc_id_map_release, | |
2764 | }; | |
f76d207a EB |
2765 | |
2766 | static const struct file_operations proc_projid_map_operations = { | |
2767 | .open = proc_projid_map_open, | |
2768 | .write = proc_projid_map_write, | |
2769 | .read = seq_read, | |
2770 | .llseek = seq_lseek, | |
2771 | .release = proc_id_map_release, | |
2772 | }; | |
9cc46516 EB |
2773 | |
2774 | static int proc_setgroups_open(struct inode *inode, struct file *file) | |
2775 | { | |
2776 | struct user_namespace *ns = NULL; | |
2777 | struct task_struct *task; | |
2778 | int ret; | |
2779 | ||
2780 | ret = -ESRCH; | |
2781 | task = get_proc_task(inode); | |
2782 | if (task) { | |
2783 | rcu_read_lock(); | |
2784 | ns = get_user_ns(task_cred_xxx(task, user_ns)); | |
2785 | rcu_read_unlock(); | |
2786 | put_task_struct(task); | |
2787 | } | |
2788 | if (!ns) | |
2789 | goto err; | |
2790 | ||
2791 | if (file->f_mode & FMODE_WRITE) { | |
2792 | ret = -EACCES; | |
2793 | if (!ns_capable(ns, CAP_SYS_ADMIN)) | |
2794 | goto err_put_ns; | |
2795 | } | |
2796 | ||
2797 | ret = single_open(file, &proc_setgroups_show, ns); | |
2798 | if (ret) | |
2799 | goto err_put_ns; | |
2800 | ||
2801 | return 0; | |
2802 | err_put_ns: | |
2803 | put_user_ns(ns); | |
2804 | err: | |
2805 | return ret; | |
2806 | } | |
2807 | ||
2808 | static int proc_setgroups_release(struct inode *inode, struct file *file) | |
2809 | { | |
2810 | struct seq_file *seq = file->private_data; | |
2811 | struct user_namespace *ns = seq->private; | |
2812 | int ret = single_release(inode, file); | |
2813 | put_user_ns(ns); | |
2814 | return ret; | |
2815 | } | |
2816 | ||
2817 | static const struct file_operations proc_setgroups_operations = { | |
2818 | .open = proc_setgroups_open, | |
2819 | .write = proc_setgroups_write, | |
2820 | .read = seq_read, | |
2821 | .llseek = seq_lseek, | |
2822 | .release = proc_setgroups_release, | |
2823 | }; | |
22d917d8 EB |
2824 | #endif /* CONFIG_USER_NS */ |
2825 | ||
47830723 KC |
2826 | static int proc_pid_personality(struct seq_file *m, struct pid_namespace *ns, |
2827 | struct pid *pid, struct task_struct *task) | |
2828 | { | |
a9712bc1 AV |
2829 | int err = lock_trace(task); |
2830 | if (!err) { | |
2831 | seq_printf(m, "%08x\n", task->personality); | |
2832 | unlock_trace(task); | |
2833 | } | |
2834 | return err; | |
47830723 KC |
2835 | } |
2836 | ||
7c23b330 JP |
2837 | #ifdef CONFIG_LIVEPATCH |
2838 | static int proc_pid_patch_state(struct seq_file *m, struct pid_namespace *ns, | |
2839 | struct pid *pid, struct task_struct *task) | |
2840 | { | |
2841 | seq_printf(m, "%d\n", task->patch_state); | |
2842 | return 0; | |
2843 | } | |
2844 | #endif /* CONFIG_LIVEPATCH */ | |
2845 | ||
28a6d671 EB |
2846 | /* |
2847 | * Thread groups | |
2848 | */ | |
00977a59 | 2849 | static const struct file_operations proc_task_operations; |
c5ef1c42 | 2850 | static const struct inode_operations proc_task_inode_operations; |
20cdc894 | 2851 | |
c5141e6d | 2852 | static const struct pid_entry tgid_base_stuff[] = { |
631f9c18 AD |
2853 | DIR("task", S_IRUGO|S_IXUGO, proc_task_inode_operations, proc_task_operations), |
2854 | DIR("fd", S_IRUSR|S_IXUSR, proc_fd_inode_operations, proc_fd_operations), | |
640708a2 | 2855 | DIR("map_files", S_IRUSR|S_IXUSR, proc_map_files_inode_operations, proc_map_files_operations), |
631f9c18 | 2856 | DIR("fdinfo", S_IRUSR|S_IXUSR, proc_fdinfo_inode_operations, proc_fdinfo_operations), |
6b4e306a | 2857 | DIR("ns", S_IRUSR|S_IXUGO, proc_ns_dir_inode_operations, proc_ns_dir_operations), |
b2211a36 | 2858 | #ifdef CONFIG_NET |
631f9c18 | 2859 | DIR("net", S_IRUGO|S_IXUGO, proc_net_inode_operations, proc_net_operations), |
b2211a36 | 2860 | #endif |
631f9c18 | 2861 | REG("environ", S_IRUSR, proc_environ_operations), |
c5317167 | 2862 | REG("auxv", S_IRUSR, proc_auxv_operations), |
631f9c18 | 2863 | ONE("status", S_IRUGO, proc_pid_status), |
35a35046 | 2864 | ONE("personality", S_IRUSR, proc_pid_personality), |
1c963eb1 | 2865 | ONE("limits", S_IRUGO, proc_pid_limits), |
43ae34cb | 2866 | #ifdef CONFIG_SCHED_DEBUG |
631f9c18 | 2867 | REG("sched", S_IRUGO|S_IWUSR, proc_pid_sched_operations), |
5091faa4 MG |
2868 | #endif |
2869 | #ifdef CONFIG_SCHED_AUTOGROUP | |
2870 | REG("autogroup", S_IRUGO|S_IWUSR, proc_pid_sched_autogroup_operations), | |
ebcb6734 | 2871 | #endif |
4614a696 | 2872 | REG("comm", S_IRUGO|S_IWUSR, proc_pid_set_comm_operations), |
ebcb6734 | 2873 | #ifdef CONFIG_HAVE_ARCH_TRACEHOOK |
09d93bd6 | 2874 | ONE("syscall", S_IRUSR, proc_pid_syscall), |
43ae34cb | 2875 | #endif |
c2c0bb44 | 2876 | REG("cmdline", S_IRUGO, proc_pid_cmdline_ops), |
631f9c18 AD |
2877 | ONE("stat", S_IRUGO, proc_tgid_stat), |
2878 | ONE("statm", S_IRUGO, proc_pid_statm), | |
b7643757 | 2879 | REG("maps", S_IRUGO, proc_pid_maps_operations), |
28a6d671 | 2880 | #ifdef CONFIG_NUMA |
b7643757 | 2881 | REG("numa_maps", S_IRUGO, proc_pid_numa_maps_operations), |
28a6d671 | 2882 | #endif |
631f9c18 AD |
2883 | REG("mem", S_IRUSR|S_IWUSR, proc_mem_operations), |
2884 | LNK("cwd", proc_cwd_link), | |
2885 | LNK("root", proc_root_link), | |
2886 | LNK("exe", proc_exe_link), | |
2887 | REG("mounts", S_IRUGO, proc_mounts_operations), | |
2888 | REG("mountinfo", S_IRUGO, proc_mountinfo_operations), | |
2889 | REG("mountstats", S_IRUSR, proc_mountstats_operations), | |
1e883281 | 2890 | #ifdef CONFIG_PROC_PAGE_MONITOR |
631f9c18 | 2891 | REG("clear_refs", S_IWUSR, proc_clear_refs_operations), |
b7643757 | 2892 | REG("smaps", S_IRUGO, proc_pid_smaps_operations), |
32ed74a4 | 2893 | REG("pagemap", S_IRUSR, proc_pagemap_operations), |
28a6d671 EB |
2894 | #endif |
2895 | #ifdef CONFIG_SECURITY | |
631f9c18 | 2896 | DIR("attr", S_IRUGO|S_IXUGO, proc_attr_dir_inode_operations, proc_attr_dir_operations), |
28a6d671 EB |
2897 | #endif |
2898 | #ifdef CONFIG_KALLSYMS | |
edfcd606 | 2899 | ONE("wchan", S_IRUGO, proc_pid_wchan), |
28a6d671 | 2900 | #endif |
2ec220e2 | 2901 | #ifdef CONFIG_STACKTRACE |
35a35046 | 2902 | ONE("stack", S_IRUSR, proc_pid_stack), |
28a6d671 | 2903 | #endif |
5968cece | 2904 | #ifdef CONFIG_SCHED_INFO |
f6e826ca | 2905 | ONE("schedstat", S_IRUGO, proc_pid_schedstat), |
28a6d671 | 2906 | #endif |
9745512c | 2907 | #ifdef CONFIG_LATENCYTOP |
631f9c18 | 2908 | REG("latency", S_IRUGO, proc_lstats_operations), |
9745512c | 2909 | #endif |
8793d854 | 2910 | #ifdef CONFIG_PROC_PID_CPUSET |
52de4779 | 2911 | ONE("cpuset", S_IRUGO, proc_cpuset_show), |
a424316c PM |
2912 | #endif |
2913 | #ifdef CONFIG_CGROUPS | |
006f4ac4 | 2914 | ONE("cgroup", S_IRUGO, proc_cgroup_show), |
28a6d671 | 2915 | #endif |
6ba51e37 | 2916 | ONE("oom_score", S_IRUGO, proc_oom_score), |
fa0cbbf1 | 2917 | REG("oom_adj", S_IRUGO|S_IWUSR, proc_oom_adj_operations), |
a63d83f4 | 2918 | REG("oom_score_adj", S_IRUGO|S_IWUSR, proc_oom_score_adj_operations), |
28a6d671 | 2919 | #ifdef CONFIG_AUDITSYSCALL |
631f9c18 AD |
2920 | REG("loginuid", S_IWUSR|S_IRUGO, proc_loginuid_operations), |
2921 | REG("sessionid", S_IRUGO, proc_sessionid_operations), | |
28a6d671 | 2922 | #endif |
f4f154fd | 2923 | #ifdef CONFIG_FAULT_INJECTION |
631f9c18 | 2924 | REG("make-it-fail", S_IRUGO|S_IWUSR, proc_fault_inject_operations), |
f4f154fd | 2925 | #endif |
698ba7b5 | 2926 | #ifdef CONFIG_ELF_CORE |
631f9c18 | 2927 | REG("coredump_filter", S_IRUGO|S_IWUSR, proc_coredump_filter_operations), |
3cb4a0bb | 2928 | #endif |
aba76fdb | 2929 | #ifdef CONFIG_TASK_IO_ACCOUNTING |
19aadc98 | 2930 | ONE("io", S_IRUSR, proc_tgid_io_accounting), |
aba76fdb | 2931 | #endif |
f133ecca | 2932 | #ifdef CONFIG_HARDWALL |
d962c144 | 2933 | ONE("hardwall", S_IRUGO, proc_pid_hardwall), |
f133ecca | 2934 | #endif |
22d917d8 EB |
2935 | #ifdef CONFIG_USER_NS |
2936 | REG("uid_map", S_IRUGO|S_IWUSR, proc_uid_map_operations), | |
2937 | REG("gid_map", S_IRUGO|S_IWUSR, proc_gid_map_operations), | |
f76d207a | 2938 | REG("projid_map", S_IRUGO|S_IWUSR, proc_projid_map_operations), |
9cc46516 | 2939 | REG("setgroups", S_IRUGO|S_IWUSR, proc_setgroups_operations), |
22d917d8 | 2940 | #endif |
b18b6a9c | 2941 | #if defined(CONFIG_CHECKPOINT_RESTORE) && defined(CONFIG_POSIX_TIMERS) |
48f6a7a5 PE |
2942 | REG("timers", S_IRUGO, proc_timers_operations), |
2943 | #endif | |
5de23d43 | 2944 | REG("timerslack_ns", S_IRUGO|S_IWUGO, proc_pid_set_timerslack_ns_operations), |
7c23b330 JP |
2945 | #ifdef CONFIG_LIVEPATCH |
2946 | ONE("patch_state", S_IRUSR, proc_pid_patch_state), | |
2947 | #endif | |
28a6d671 | 2948 | }; |
1da177e4 | 2949 | |
f0c3b509 | 2950 | static int proc_tgid_base_readdir(struct file *file, struct dir_context *ctx) |
1da177e4 | 2951 | { |
f0c3b509 AV |
2952 | return proc_pident_readdir(file, ctx, |
2953 | tgid_base_stuff, ARRAY_SIZE(tgid_base_stuff)); | |
1da177e4 LT |
2954 | } |
2955 | ||
00977a59 | 2956 | static const struct file_operations proc_tgid_base_operations = { |
1da177e4 | 2957 | .read = generic_read_dir, |
f50752ea AV |
2958 | .iterate_shared = proc_tgid_base_readdir, |
2959 | .llseek = generic_file_llseek, | |
1da177e4 LT |
2960 | }; |
2961 | ||
00cd8dd3 AV |
2962 | static struct dentry *proc_tgid_base_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags) |
2963 | { | |
7bcd6b0e EB |
2964 | return proc_pident_lookup(dir, dentry, |
2965 | tgid_base_stuff, ARRAY_SIZE(tgid_base_stuff)); | |
1da177e4 LT |
2966 | } |
2967 | ||
c5ef1c42 | 2968 | static const struct inode_operations proc_tgid_base_inode_operations = { |
28a6d671 | 2969 | .lookup = proc_tgid_base_lookup, |
99f89551 | 2970 | .getattr = pid_getattr, |
6d76fa58 | 2971 | .setattr = proc_setattr, |
0499680a | 2972 | .permission = proc_pid_permission, |
1da177e4 | 2973 | }; |
1da177e4 | 2974 | |
60347f67 | 2975 | static void proc_flush_task_mnt(struct vfsmount *mnt, pid_t pid, pid_t tgid) |
1da177e4 | 2976 | { |
48e6484d | 2977 | struct dentry *dentry, *leader, *dir; |
8578cea7 | 2978 | char buf[PROC_NUMBUF]; |
48e6484d EB |
2979 | struct qstr name; |
2980 | ||
2981 | name.name = buf; | |
60347f67 | 2982 | name.len = snprintf(buf, sizeof(buf), "%d", pid); |
4f522a24 | 2983 | /* no ->d_hash() rejects on procfs */ |
60347f67 | 2984 | dentry = d_hash_and_lookup(mnt->mnt_root, &name); |
48e6484d | 2985 | if (dentry) { |
bbd51924 | 2986 | d_invalidate(dentry); |
48e6484d EB |
2987 | dput(dentry); |
2988 | } | |
1da177e4 | 2989 | |
c35a7f18 ON |
2990 | if (pid == tgid) |
2991 | return; | |
2992 | ||
48e6484d | 2993 | name.name = buf; |
60347f67 PE |
2994 | name.len = snprintf(buf, sizeof(buf), "%d", tgid); |
2995 | leader = d_hash_and_lookup(mnt->mnt_root, &name); | |
48e6484d EB |
2996 | if (!leader) |
2997 | goto out; | |
1da177e4 | 2998 | |
48e6484d EB |
2999 | name.name = "task"; |
3000 | name.len = strlen(name.name); | |
3001 | dir = d_hash_and_lookup(leader, &name); | |
3002 | if (!dir) | |
3003 | goto out_put_leader; | |
3004 | ||
3005 | name.name = buf; | |
60347f67 | 3006 | name.len = snprintf(buf, sizeof(buf), "%d", pid); |
48e6484d EB |
3007 | dentry = d_hash_and_lookup(dir, &name); |
3008 | if (dentry) { | |
bbd51924 | 3009 | d_invalidate(dentry); |
48e6484d | 3010 | dput(dentry); |
1da177e4 | 3011 | } |
48e6484d EB |
3012 | |
3013 | dput(dir); | |
3014 | out_put_leader: | |
3015 | dput(leader); | |
3016 | out: | |
3017 | return; | |
1da177e4 LT |
3018 | } |
3019 | ||
0895e91d RD |
3020 | /** |
3021 | * proc_flush_task - Remove dcache entries for @task from the /proc dcache. | |
3022 | * @task: task that should be flushed. | |
3023 | * | |
3024 | * When flushing dentries from proc, one needs to flush them from global | |
60347f67 | 3025 | * proc (proc_mnt) and from all the namespaces' procs this task was seen |
0895e91d RD |
3026 | * in. This call is supposed to do all of this job. |
3027 | * | |
3028 | * Looks in the dcache for | |
3029 | * /proc/@pid | |
3030 | * /proc/@tgid/task/@pid | |
3031 | * if either directory is present flushes it and all of it'ts children | |
3032 | * from the dcache. | |
3033 | * | |
3034 | * It is safe and reasonable to cache /proc entries for a task until | |
3035 | * that task exits. After that they just clog up the dcache with | |
3036 | * useless entries, possibly causing useful dcache entries to be | |
3037 | * flushed instead. This routine is proved to flush those useless | |
3038 | * dcache entries at process exit time. | |
3039 | * | |
3040 | * NOTE: This routine is just an optimization so it does not guarantee | |
3041 | * that no dcache entries will exist at process exit time it | |
3042 | * just makes it very unlikely that any will persist. | |
60347f67 PE |
3043 | */ |
3044 | ||
3045 | void proc_flush_task(struct task_struct *task) | |
3046 | { | |
9fcc2d15 | 3047 | int i; |
9b4d1cbe | 3048 | struct pid *pid, *tgid; |
130f77ec PE |
3049 | struct upid *upid; |
3050 | ||
130f77ec | 3051 | pid = task_pid(task); |
9b4d1cbe | 3052 | tgid = task_tgid(task); |
130f77ec | 3053 | |
9fcc2d15 | 3054 | for (i = 0; i <= pid->level; i++) { |
130f77ec PE |
3055 | upid = &pid->numbers[i]; |
3056 | proc_flush_task_mnt(upid->ns->proc_mnt, upid->nr, | |
9b4d1cbe | 3057 | tgid->numbers[i].nr); |
130f77ec | 3058 | } |
60347f67 PE |
3059 | } |
3060 | ||
c52a47ac AV |
3061 | static int proc_pid_instantiate(struct inode *dir, |
3062 | struct dentry * dentry, | |
3063 | struct task_struct *task, const void *ptr) | |
444ceed8 | 3064 | { |
444ceed8 EB |
3065 | struct inode *inode; |
3066 | ||
db978da8 | 3067 | inode = proc_pid_make_inode(dir->i_sb, task, S_IFDIR | S_IRUGO | S_IXUGO); |
444ceed8 EB |
3068 | if (!inode) |
3069 | goto out; | |
3070 | ||
444ceed8 EB |
3071 | inode->i_op = &proc_tgid_base_inode_operations; |
3072 | inode->i_fop = &proc_tgid_base_operations; | |
3073 | inode->i_flags|=S_IMMUTABLE; | |
aed54175 | 3074 | |
1270dd8d | 3075 | set_nlink(inode, nlink_tgid); |
444ceed8 | 3076 | |
fb045adb | 3077 | d_set_d_op(dentry, &pid_dentry_operations); |
444ceed8 EB |
3078 | |
3079 | d_add(dentry, inode); | |
3080 | /* Close the race of the process dying before we return the dentry */ | |
0b728e19 | 3081 | if (pid_revalidate(dentry, 0)) |
c52a47ac | 3082 | return 0; |
444ceed8 | 3083 | out: |
c52a47ac | 3084 | return -ENOENT; |
444ceed8 EB |
3085 | } |
3086 | ||
00cd8dd3 | 3087 | struct dentry *proc_pid_lookup(struct inode *dir, struct dentry * dentry, unsigned int flags) |
1da177e4 | 3088 | { |
335eb531 | 3089 | int result = -ENOENT; |
1da177e4 | 3090 | struct task_struct *task; |
1da177e4 | 3091 | unsigned tgid; |
b488893a | 3092 | struct pid_namespace *ns; |
1da177e4 | 3093 | |
dbcdb504 | 3094 | tgid = name_to_int(&dentry->d_name); |
1da177e4 LT |
3095 | if (tgid == ~0U) |
3096 | goto out; | |
3097 | ||
b488893a | 3098 | ns = dentry->d_sb->s_fs_info; |
de758734 | 3099 | rcu_read_lock(); |
b488893a | 3100 | task = find_task_by_pid_ns(tgid, ns); |
1da177e4 LT |
3101 | if (task) |
3102 | get_task_struct(task); | |
de758734 | 3103 | rcu_read_unlock(); |
1da177e4 LT |
3104 | if (!task) |
3105 | goto out; | |
3106 | ||
444ceed8 | 3107 | result = proc_pid_instantiate(dir, dentry, task, NULL); |
1da177e4 | 3108 | put_task_struct(task); |
1da177e4 | 3109 | out: |
c52a47ac | 3110 | return ERR_PTR(result); |
1da177e4 LT |
3111 | } |
3112 | ||
1da177e4 | 3113 | /* |
0804ef4b | 3114 | * Find the first task with tgid >= tgid |
0bc58a91 | 3115 | * |
1da177e4 | 3116 | */ |
19fd4bb2 EB |
3117 | struct tgid_iter { |
3118 | unsigned int tgid; | |
0804ef4b | 3119 | struct task_struct *task; |
19fd4bb2 EB |
3120 | }; |
3121 | static struct tgid_iter next_tgid(struct pid_namespace *ns, struct tgid_iter iter) | |
3122 | { | |
0804ef4b | 3123 | struct pid *pid; |
1da177e4 | 3124 | |
19fd4bb2 EB |
3125 | if (iter.task) |
3126 | put_task_struct(iter.task); | |
454cc105 | 3127 | rcu_read_lock(); |
0804ef4b | 3128 | retry: |
19fd4bb2 EB |
3129 | iter.task = NULL; |
3130 | pid = find_ge_pid(iter.tgid, ns); | |
0804ef4b | 3131 | if (pid) { |
19fd4bb2 EB |
3132 | iter.tgid = pid_nr_ns(pid, ns); |
3133 | iter.task = pid_task(pid, PIDTYPE_PID); | |
0804ef4b EB |
3134 | /* What we to know is if the pid we have find is the |
3135 | * pid of a thread_group_leader. Testing for task | |
3136 | * being a thread_group_leader is the obvious thing | |
3137 | * todo but there is a window when it fails, due to | |
3138 | * the pid transfer logic in de_thread. | |
3139 | * | |
3140 | * So we perform the straight forward test of seeing | |
3141 | * if the pid we have found is the pid of a thread | |
3142 | * group leader, and don't worry if the task we have | |
3143 | * found doesn't happen to be a thread group leader. | |
3144 | * As we don't care in the case of readdir. | |
3145 | */ | |
19fd4bb2 EB |
3146 | if (!iter.task || !has_group_leader_pid(iter.task)) { |
3147 | iter.tgid += 1; | |
0804ef4b | 3148 | goto retry; |
19fd4bb2 EB |
3149 | } |
3150 | get_task_struct(iter.task); | |
0bc58a91 | 3151 | } |
454cc105 | 3152 | rcu_read_unlock(); |
19fd4bb2 | 3153 | return iter; |
1da177e4 LT |
3154 | } |
3155 | ||
0097875b | 3156 | #define TGID_OFFSET (FIRST_PROCESS_ENTRY + 2) |
0804ef4b | 3157 | |
1da177e4 | 3158 | /* for the /proc/ directory itself, after non-process stuff has been done */ |
f0c3b509 | 3159 | int proc_pid_readdir(struct file *file, struct dir_context *ctx) |
1da177e4 | 3160 | { |
19fd4bb2 | 3161 | struct tgid_iter iter; |
3aa3377f | 3162 | struct pid_namespace *ns = file_inode(file)->i_sb->s_fs_info; |
f0c3b509 | 3163 | loff_t pos = ctx->pos; |
1da177e4 | 3164 | |
021ada7d | 3165 | if (pos >= PID_MAX_LIMIT + TGID_OFFSET) |
f0c3b509 | 3166 | return 0; |
1da177e4 | 3167 | |
0097875b | 3168 | if (pos == TGID_OFFSET - 2) { |
2b0143b5 | 3169 | struct inode *inode = d_inode(ns->proc_self); |
db963164 | 3170 | if (!dir_emit(ctx, "self", 4, inode->i_ino, DT_LNK)) |
f0c3b509 | 3171 | return 0; |
0097875b EB |
3172 | ctx->pos = pos = pos + 1; |
3173 | } | |
3174 | if (pos == TGID_OFFSET - 1) { | |
2b0143b5 | 3175 | struct inode *inode = d_inode(ns->proc_thread_self); |
0097875b EB |
3176 | if (!dir_emit(ctx, "thread-self", 11, inode->i_ino, DT_LNK)) |
3177 | return 0; | |
3178 | ctx->pos = pos = pos + 1; | |
021ada7d | 3179 | } |
0097875b | 3180 | iter.tgid = pos - TGID_OFFSET; |
19fd4bb2 | 3181 | iter.task = NULL; |
19fd4bb2 EB |
3182 | for (iter = next_tgid(ns, iter); |
3183 | iter.task; | |
3184 | iter.tgid += 1, iter = next_tgid(ns, iter)) { | |
f0c3b509 AV |
3185 | char name[PROC_NUMBUF]; |
3186 | int len; | |
3ba4bcee ED |
3187 | |
3188 | cond_resched(); | |
796f571b | 3189 | if (!has_pid_permissions(ns, iter.task, HIDEPID_INVISIBLE)) |
f0c3b509 | 3190 | continue; |
0499680a | 3191 | |
f0c3b509 AV |
3192 | len = snprintf(name, sizeof(name), "%d", iter.tgid); |
3193 | ctx->pos = iter.tgid + TGID_OFFSET; | |
3194 | if (!proc_fill_cache(file, ctx, name, len, | |
3195 | proc_pid_instantiate, iter.task, NULL)) { | |
19fd4bb2 | 3196 | put_task_struct(iter.task); |
f0c3b509 | 3197 | return 0; |
1da177e4 | 3198 | } |
0bc58a91 | 3199 | } |
f0c3b509 | 3200 | ctx->pos = PID_MAX_LIMIT + TGID_OFFSET; |
0bc58a91 EB |
3201 | return 0; |
3202 | } | |
1da177e4 | 3203 | |
1b3044e3 JD |
3204 | /* |
3205 | * proc_tid_comm_permission is a special permission function exclusively | |
3206 | * used for the node /proc/<pid>/task/<tid>/comm. | |
3207 | * It bypasses generic permission checks in the case where a task of the same | |
3208 | * task group attempts to access the node. | |
3209 | * The rationale behind this is that glibc and bionic access this node for | |
3210 | * cross thread naming (pthread_set/getname_np(!self)). However, if | |
3211 | * PR_SET_DUMPABLE gets set to 0 this node among others becomes uid=0 gid=0, | |
3212 | * which locks out the cross thread naming implementation. | |
3213 | * This function makes sure that the node is always accessible for members of | |
3214 | * same thread group. | |
3215 | */ | |
3216 | static int proc_tid_comm_permission(struct inode *inode, int mask) | |
3217 | { | |
3218 | bool is_same_tgroup; | |
3219 | struct task_struct *task; | |
3220 | ||
3221 | task = get_proc_task(inode); | |
3222 | if (!task) | |
3223 | return -ESRCH; | |
3224 | is_same_tgroup = same_thread_group(current, task); | |
3225 | put_task_struct(task); | |
3226 | ||
3227 | if (likely(is_same_tgroup && !(mask & MAY_EXEC))) { | |
3228 | /* This file (/proc/<pid>/task/<tid>/comm) can always be | |
3229 | * read or written by the members of the corresponding | |
3230 | * thread group. | |
3231 | */ | |
3232 | return 0; | |
3233 | } | |
3234 | ||
3235 | return generic_permission(inode, mask); | |
3236 | } | |
3237 | ||
3238 | static const struct inode_operations proc_tid_comm_inode_operations = { | |
3239 | .permission = proc_tid_comm_permission, | |
3240 | }; | |
3241 | ||
28a6d671 EB |
3242 | /* |
3243 | * Tasks | |
3244 | */ | |
c5141e6d | 3245 | static const struct pid_entry tid_base_stuff[] = { |
631f9c18 | 3246 | DIR("fd", S_IRUSR|S_IXUSR, proc_fd_inode_operations, proc_fd_operations), |
3835541d | 3247 | DIR("fdinfo", S_IRUSR|S_IXUSR, proc_fdinfo_inode_operations, proc_fdinfo_operations), |
6b4e306a | 3248 | DIR("ns", S_IRUSR|S_IXUGO, proc_ns_dir_inode_operations, proc_ns_dir_operations), |
6ba8ed79 EB |
3249 | #ifdef CONFIG_NET |
3250 | DIR("net", S_IRUGO|S_IXUGO, proc_net_inode_operations, proc_net_operations), | |
3251 | #endif | |
631f9c18 | 3252 | REG("environ", S_IRUSR, proc_environ_operations), |
c5317167 | 3253 | REG("auxv", S_IRUSR, proc_auxv_operations), |
631f9c18 | 3254 | ONE("status", S_IRUGO, proc_pid_status), |
35a35046 | 3255 | ONE("personality", S_IRUSR, proc_pid_personality), |
1c963eb1 | 3256 | ONE("limits", S_IRUGO, proc_pid_limits), |
43ae34cb | 3257 | #ifdef CONFIG_SCHED_DEBUG |
631f9c18 | 3258 | REG("sched", S_IRUGO|S_IWUSR, proc_pid_sched_operations), |
ebcb6734 | 3259 | #endif |
1b3044e3 JD |
3260 | NOD("comm", S_IFREG|S_IRUGO|S_IWUSR, |
3261 | &proc_tid_comm_inode_operations, | |
3262 | &proc_pid_set_comm_operations, {}), | |
ebcb6734 | 3263 | #ifdef CONFIG_HAVE_ARCH_TRACEHOOK |
09d93bd6 | 3264 | ONE("syscall", S_IRUSR, proc_pid_syscall), |
43ae34cb | 3265 | #endif |
c2c0bb44 | 3266 | REG("cmdline", S_IRUGO, proc_pid_cmdline_ops), |
631f9c18 AD |
3267 | ONE("stat", S_IRUGO, proc_tid_stat), |
3268 | ONE("statm", S_IRUGO, proc_pid_statm), | |
b7643757 | 3269 | REG("maps", S_IRUGO, proc_tid_maps_operations), |
2e13ba54 | 3270 | #ifdef CONFIG_PROC_CHILDREN |
81841161 CG |
3271 | REG("children", S_IRUGO, proc_tid_children_operations), |
3272 | #endif | |
28a6d671 | 3273 | #ifdef CONFIG_NUMA |
b7643757 | 3274 | REG("numa_maps", S_IRUGO, proc_tid_numa_maps_operations), |
28a6d671 | 3275 | #endif |
631f9c18 AD |
3276 | REG("mem", S_IRUSR|S_IWUSR, proc_mem_operations), |
3277 | LNK("cwd", proc_cwd_link), | |
3278 | LNK("root", proc_root_link), | |
3279 | LNK("exe", proc_exe_link), | |
3280 | REG("mounts", S_IRUGO, proc_mounts_operations), | |
3281 | REG("mountinfo", S_IRUGO, proc_mountinfo_operations), | |
1e883281 | 3282 | #ifdef CONFIG_PROC_PAGE_MONITOR |
631f9c18 | 3283 | REG("clear_refs", S_IWUSR, proc_clear_refs_operations), |
b7643757 | 3284 | REG("smaps", S_IRUGO, proc_tid_smaps_operations), |
32ed74a4 | 3285 | REG("pagemap", S_IRUSR, proc_pagemap_operations), |
28a6d671 EB |
3286 | #endif |
3287 | #ifdef CONFIG_SECURITY | |
631f9c18 | 3288 | DIR("attr", S_IRUGO|S_IXUGO, proc_attr_dir_inode_operations, proc_attr_dir_operations), |
28a6d671 EB |
3289 | #endif |
3290 | #ifdef CONFIG_KALLSYMS | |
edfcd606 | 3291 | ONE("wchan", S_IRUGO, proc_pid_wchan), |
28a6d671 | 3292 | #endif |
2ec220e2 | 3293 | #ifdef CONFIG_STACKTRACE |
35a35046 | 3294 | ONE("stack", S_IRUSR, proc_pid_stack), |
28a6d671 | 3295 | #endif |
5968cece | 3296 | #ifdef CONFIG_SCHED_INFO |
f6e826ca | 3297 | ONE("schedstat", S_IRUGO, proc_pid_schedstat), |
28a6d671 | 3298 | #endif |
9745512c | 3299 | #ifdef CONFIG_LATENCYTOP |
631f9c18 | 3300 | REG("latency", S_IRUGO, proc_lstats_operations), |
9745512c | 3301 | #endif |
8793d854 | 3302 | #ifdef CONFIG_PROC_PID_CPUSET |
52de4779 | 3303 | ONE("cpuset", S_IRUGO, proc_cpuset_show), |
a424316c PM |
3304 | #endif |
3305 | #ifdef CONFIG_CGROUPS | |
006f4ac4 | 3306 | ONE("cgroup", S_IRUGO, proc_cgroup_show), |
28a6d671 | 3307 | #endif |
6ba51e37 | 3308 | ONE("oom_score", S_IRUGO, proc_oom_score), |
fa0cbbf1 | 3309 | REG("oom_adj", S_IRUGO|S_IWUSR, proc_oom_adj_operations), |
a63d83f4 | 3310 | REG("oom_score_adj", S_IRUGO|S_IWUSR, proc_oom_score_adj_operations), |
28a6d671 | 3311 | #ifdef CONFIG_AUDITSYSCALL |
631f9c18 | 3312 | REG("loginuid", S_IWUSR|S_IRUGO, proc_loginuid_operations), |
26ec3c64 | 3313 | REG("sessionid", S_IRUGO, proc_sessionid_operations), |
28a6d671 | 3314 | #endif |
f4f154fd | 3315 | #ifdef CONFIG_FAULT_INJECTION |
631f9c18 | 3316 | REG("make-it-fail", S_IRUGO|S_IWUSR, proc_fault_inject_operations), |
f4f154fd | 3317 | #endif |
297c5d92 | 3318 | #ifdef CONFIG_TASK_IO_ACCOUNTING |
19aadc98 | 3319 | ONE("io", S_IRUSR, proc_tid_io_accounting), |
297c5d92 | 3320 | #endif |
f133ecca | 3321 | #ifdef CONFIG_HARDWALL |
d962c144 | 3322 | ONE("hardwall", S_IRUGO, proc_pid_hardwall), |
f133ecca | 3323 | #endif |
22d917d8 EB |
3324 | #ifdef CONFIG_USER_NS |
3325 | REG("uid_map", S_IRUGO|S_IWUSR, proc_uid_map_operations), | |
3326 | REG("gid_map", S_IRUGO|S_IWUSR, proc_gid_map_operations), | |
f76d207a | 3327 | REG("projid_map", S_IRUGO|S_IWUSR, proc_projid_map_operations), |
9cc46516 | 3328 | REG("setgroups", S_IRUGO|S_IWUSR, proc_setgroups_operations), |
22d917d8 | 3329 | #endif |
7c23b330 JP |
3330 | #ifdef CONFIG_LIVEPATCH |
3331 | ONE("patch_state", S_IRUSR, proc_pid_patch_state), | |
3332 | #endif | |
28a6d671 EB |
3333 | }; |
3334 | ||
f0c3b509 | 3335 | static int proc_tid_base_readdir(struct file *file, struct dir_context *ctx) |
28a6d671 | 3336 | { |
f0c3b509 AV |
3337 | return proc_pident_readdir(file, ctx, |
3338 | tid_base_stuff, ARRAY_SIZE(tid_base_stuff)); | |
28a6d671 EB |
3339 | } |
3340 | ||
00cd8dd3 AV |
3341 | static struct dentry *proc_tid_base_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags) |
3342 | { | |
7bcd6b0e EB |
3343 | return proc_pident_lookup(dir, dentry, |
3344 | tid_base_stuff, ARRAY_SIZE(tid_base_stuff)); | |
28a6d671 EB |
3345 | } |
3346 | ||
00977a59 | 3347 | static const struct file_operations proc_tid_base_operations = { |
28a6d671 | 3348 | .read = generic_read_dir, |
f50752ea AV |
3349 | .iterate_shared = proc_tid_base_readdir, |
3350 | .llseek = generic_file_llseek, | |
28a6d671 EB |
3351 | }; |
3352 | ||
c5ef1c42 | 3353 | static const struct inode_operations proc_tid_base_inode_operations = { |
28a6d671 EB |
3354 | .lookup = proc_tid_base_lookup, |
3355 | .getattr = pid_getattr, | |
3356 | .setattr = proc_setattr, | |
3357 | }; | |
3358 | ||
c52a47ac | 3359 | static int proc_task_instantiate(struct inode *dir, |
c5141e6d | 3360 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
444ceed8 | 3361 | { |
444ceed8 | 3362 | struct inode *inode; |
db978da8 | 3363 | inode = proc_pid_make_inode(dir->i_sb, task, S_IFDIR | S_IRUGO | S_IXUGO); |
444ceed8 EB |
3364 | |
3365 | if (!inode) | |
3366 | goto out; | |
444ceed8 EB |
3367 | inode->i_op = &proc_tid_base_inode_operations; |
3368 | inode->i_fop = &proc_tid_base_operations; | |
3369 | inode->i_flags|=S_IMMUTABLE; | |
aed54175 | 3370 | |
1270dd8d | 3371 | set_nlink(inode, nlink_tid); |
444ceed8 | 3372 | |
fb045adb | 3373 | d_set_d_op(dentry, &pid_dentry_operations); |
444ceed8 EB |
3374 | |
3375 | d_add(dentry, inode); | |
3376 | /* Close the race of the process dying before we return the dentry */ | |
0b728e19 | 3377 | if (pid_revalidate(dentry, 0)) |
c52a47ac | 3378 | return 0; |
444ceed8 | 3379 | out: |
c52a47ac | 3380 | return -ENOENT; |
444ceed8 EB |
3381 | } |
3382 | ||
00cd8dd3 | 3383 | static struct dentry *proc_task_lookup(struct inode *dir, struct dentry * dentry, unsigned int flags) |
28a6d671 | 3384 | { |
c52a47ac | 3385 | int result = -ENOENT; |
28a6d671 EB |
3386 | struct task_struct *task; |
3387 | struct task_struct *leader = get_proc_task(dir); | |
28a6d671 | 3388 | unsigned tid; |
b488893a | 3389 | struct pid_namespace *ns; |
28a6d671 EB |
3390 | |
3391 | if (!leader) | |
3392 | goto out_no_task; | |
3393 | ||
dbcdb504 | 3394 | tid = name_to_int(&dentry->d_name); |
28a6d671 EB |
3395 | if (tid == ~0U) |
3396 | goto out; | |
3397 | ||
b488893a | 3398 | ns = dentry->d_sb->s_fs_info; |
28a6d671 | 3399 | rcu_read_lock(); |
b488893a | 3400 | task = find_task_by_pid_ns(tid, ns); |
28a6d671 EB |
3401 | if (task) |
3402 | get_task_struct(task); | |
3403 | rcu_read_unlock(); | |
3404 | if (!task) | |
3405 | goto out; | |
bac0abd6 | 3406 | if (!same_thread_group(leader, task)) |
28a6d671 EB |
3407 | goto out_drop_task; |
3408 | ||
444ceed8 | 3409 | result = proc_task_instantiate(dir, dentry, task, NULL); |
28a6d671 EB |
3410 | out_drop_task: |
3411 | put_task_struct(task); | |
3412 | out: | |
3413 | put_task_struct(leader); | |
3414 | out_no_task: | |
c52a47ac | 3415 | return ERR_PTR(result); |
28a6d671 EB |
3416 | } |
3417 | ||
0bc58a91 EB |
3418 | /* |
3419 | * Find the first tid of a thread group to return to user space. | |
3420 | * | |
3421 | * Usually this is just the thread group leader, but if the users | |
3422 | * buffer was too small or there was a seek into the middle of the | |
3423 | * directory we have more work todo. | |
3424 | * | |
3425 | * In the case of a short read we start with find_task_by_pid. | |
3426 | * | |
3427 | * In the case of a seek we start with the leader and walk nr | |
3428 | * threads past it. | |
3429 | */ | |
9f6e963f ON |
3430 | static struct task_struct *first_tid(struct pid *pid, int tid, loff_t f_pos, |
3431 | struct pid_namespace *ns) | |
0bc58a91 | 3432 | { |
d855a4b7 | 3433 | struct task_struct *pos, *task; |
9f6e963f ON |
3434 | unsigned long nr = f_pos; |
3435 | ||
3436 | if (nr != f_pos) /* 32bit overflow? */ | |
3437 | return NULL; | |
1da177e4 | 3438 | |
cc288738 | 3439 | rcu_read_lock(); |
d855a4b7 ON |
3440 | task = pid_task(pid, PIDTYPE_PID); |
3441 | if (!task) | |
3442 | goto fail; | |
3443 | ||
3444 | /* Attempt to start with the tid of a thread */ | |
9f6e963f | 3445 | if (tid && nr) { |
b488893a | 3446 | pos = find_task_by_pid_ns(tid, ns); |
d855a4b7 | 3447 | if (pos && same_thread_group(pos, task)) |
a872ff0c | 3448 | goto found; |
0bc58a91 | 3449 | } |
1da177e4 | 3450 | |
0bc58a91 | 3451 | /* If nr exceeds the number of threads there is nothing todo */ |
9f6e963f | 3452 | if (nr >= get_nr_threads(task)) |
c986c14a | 3453 | goto fail; |
1da177e4 | 3454 | |
a872ff0c ON |
3455 | /* If we haven't found our starting place yet start |
3456 | * with the leader and walk nr threads forward. | |
0bc58a91 | 3457 | */ |
d855a4b7 | 3458 | pos = task = task->group_leader; |
c986c14a | 3459 | do { |
9f6e963f | 3460 | if (!nr--) |
c986c14a | 3461 | goto found; |
d855a4b7 | 3462 | } while_each_thread(task, pos); |
c986c14a ON |
3463 | fail: |
3464 | pos = NULL; | |
3465 | goto out; | |
a872ff0c ON |
3466 | found: |
3467 | get_task_struct(pos); | |
3468 | out: | |
cc288738 | 3469 | rcu_read_unlock(); |
0bc58a91 EB |
3470 | return pos; |
3471 | } | |
3472 | ||
3473 | /* | |
3474 | * Find the next thread in the thread list. | |
3475 | * Return NULL if there is an error or no next thread. | |
3476 | * | |
3477 | * The reference to the input task_struct is released. | |
3478 | */ | |
3479 | static struct task_struct *next_tid(struct task_struct *start) | |
3480 | { | |
c1df7fb8 | 3481 | struct task_struct *pos = NULL; |
cc288738 | 3482 | rcu_read_lock(); |
c1df7fb8 | 3483 | if (pid_alive(start)) { |
0bc58a91 | 3484 | pos = next_thread(start); |
c1df7fb8 ON |
3485 | if (thread_group_leader(pos)) |
3486 | pos = NULL; | |
3487 | else | |
3488 | get_task_struct(pos); | |
3489 | } | |
cc288738 | 3490 | rcu_read_unlock(); |
0bc58a91 EB |
3491 | put_task_struct(start); |
3492 | return pos; | |
1da177e4 LT |
3493 | } |
3494 | ||
3495 | /* for the /proc/TGID/task/ directories */ | |
f0c3b509 | 3496 | static int proc_task_readdir(struct file *file, struct dir_context *ctx) |
1da177e4 | 3497 | { |
d855a4b7 ON |
3498 | struct inode *inode = file_inode(file); |
3499 | struct task_struct *task; | |
b488893a | 3500 | struct pid_namespace *ns; |
f0c3b509 | 3501 | int tid; |
1da177e4 | 3502 | |
d855a4b7 | 3503 | if (proc_inode_is_dead(inode)) |
f0c3b509 | 3504 | return -ENOENT; |
1da177e4 | 3505 | |
f0c3b509 | 3506 | if (!dir_emit_dots(file, ctx)) |
d855a4b7 | 3507 | return 0; |
1da177e4 | 3508 | |
0bc58a91 EB |
3509 | /* f_version caches the tgid value that the last readdir call couldn't |
3510 | * return. lseek aka telldir automagically resets f_version to 0. | |
3511 | */ | |
3aa3377f | 3512 | ns = inode->i_sb->s_fs_info; |
f0c3b509 AV |
3513 | tid = (int)file->f_version; |
3514 | file->f_version = 0; | |
d855a4b7 | 3515 | for (task = first_tid(proc_pid(inode), tid, ctx->pos - 2, ns); |
0bc58a91 | 3516 | task; |
f0c3b509 AV |
3517 | task = next_tid(task), ctx->pos++) { |
3518 | char name[PROC_NUMBUF]; | |
3519 | int len; | |
b488893a | 3520 | tid = task_pid_nr_ns(task, ns); |
f0c3b509 AV |
3521 | len = snprintf(name, sizeof(name), "%d", tid); |
3522 | if (!proc_fill_cache(file, ctx, name, len, | |
3523 | proc_task_instantiate, task, NULL)) { | |
0bc58a91 EB |
3524 | /* returning this tgid failed, save it as the first |
3525 | * pid for the next readir call */ | |
f0c3b509 | 3526 | file->f_version = (u64)tid; |
0bc58a91 | 3527 | put_task_struct(task); |
1da177e4 | 3528 | break; |
0bc58a91 | 3529 | } |
1da177e4 | 3530 | } |
d855a4b7 | 3531 | |
f0c3b509 | 3532 | return 0; |
1da177e4 | 3533 | } |
6e66b52b | 3534 | |
a528d35e DH |
3535 | static int proc_task_getattr(const struct path *path, struct kstat *stat, |
3536 | u32 request_mask, unsigned int query_flags) | |
6e66b52b | 3537 | { |
a528d35e | 3538 | struct inode *inode = d_inode(path->dentry); |
99f89551 | 3539 | struct task_struct *p = get_proc_task(inode); |
6e66b52b EB |
3540 | generic_fillattr(inode, stat); |
3541 | ||
99f89551 | 3542 | if (p) { |
99f89551 | 3543 | stat->nlink += get_nr_threads(p); |
99f89551 | 3544 | put_task_struct(p); |
6e66b52b EB |
3545 | } |
3546 | ||
3547 | return 0; | |
3548 | } | |
28a6d671 | 3549 | |
c5ef1c42 | 3550 | static const struct inode_operations proc_task_inode_operations = { |
28a6d671 EB |
3551 | .lookup = proc_task_lookup, |
3552 | .getattr = proc_task_getattr, | |
3553 | .setattr = proc_setattr, | |
0499680a | 3554 | .permission = proc_pid_permission, |
28a6d671 EB |
3555 | }; |
3556 | ||
00977a59 | 3557 | static const struct file_operations proc_task_operations = { |
28a6d671 | 3558 | .read = generic_read_dir, |
f50752ea AV |
3559 | .iterate_shared = proc_task_readdir, |
3560 | .llseek = generic_file_llseek, | |
28a6d671 | 3561 | }; |
1270dd8d AD |
3562 | |
3563 | void __init set_proc_pid_nlink(void) | |
3564 | { | |
3565 | nlink_tid = pid_entry_nlink(tid_base_stuff, ARRAY_SIZE(tid_base_stuff)); | |
3566 | nlink_tgid = pid_entry_nlink(tgid_base_stuff, ARRAY_SIZE(tgid_base_stuff)); | |
3567 | } |