Commit | Line | Data |
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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
2 | /* |
3 | * linux/fs/proc/base.c | |
4 | * | |
5 | * Copyright (C) 1991, 1992 Linus Torvalds | |
6 | * | |
7 | * proc base directory handling functions | |
8 | * | |
9 | * 1999, Al Viro. Rewritten. Now it covers the whole per-process part. | |
10 | * Instead of using magical inumbers to determine the kind of object | |
11 | * we allocate and fill in-core inodes upon lookup. They don't even | |
12 | * go into icache. We cache the reference to task_struct upon lookup too. | |
13 | * Eventually it should become a filesystem in its own. We don't use the | |
14 | * rest of procfs anymore. | |
e070ad49 ML |
15 | * |
16 | * | |
17 | * Changelog: | |
18 | * 17-Jan-2005 | |
19 | * Allan Bezerra | |
20 | * Bruna Moreira <bruna.moreira@indt.org.br> | |
21 | * Edjard Mota <edjard.mota@indt.org.br> | |
22 | * Ilias Biris <ilias.biris@indt.org.br> | |
23 | * Mauricio Lin <mauricio.lin@indt.org.br> | |
24 | * | |
25 | * Embedded Linux Lab - 10LE Instituto Nokia de Tecnologia - INdT | |
26 | * | |
27 | * A new process specific entry (smaps) included in /proc. It shows the | |
28 | * size of rss for each memory area. The maps entry lacks information | |
29 | * about physical memory size (rss) for each mapped file, i.e., | |
30 | * rss information for executables and library files. | |
31 | * This additional information is useful for any tools that need to know | |
32 | * about physical memory consumption for a process specific library. | |
33 | * | |
34 | * Changelog: | |
35 | * 21-Feb-2005 | |
36 | * Embedded Linux Lab - 10LE Instituto Nokia de Tecnologia - INdT | |
37 | * Pud inclusion in the page table walking. | |
38 | * | |
39 | * ChangeLog: | |
40 | * 10-Mar-2005 | |
41 | * 10LE Instituto Nokia de Tecnologia - INdT: | |
42 | * A better way to walks through the page table as suggested by Hugh Dickins. | |
43 | * | |
44 | * Simo Piiroinen <simo.piiroinen@nokia.com>: | |
45 | * Smaps information related to shared, private, clean and dirty pages. | |
46 | * | |
47 | * Paul Mundt <paul.mundt@nokia.com>: | |
48 | * Overall revision about smaps. | |
1da177e4 LT |
49 | */ |
50 | ||
7c0f6ba6 | 51 | #include <linux/uaccess.h> |
1da177e4 | 52 | |
1da177e4 LT |
53 | #include <linux/errno.h> |
54 | #include <linux/time.h> | |
55 | #include <linux/proc_fs.h> | |
56 | #include <linux/stat.h> | |
5995477a | 57 | #include <linux/task_io_accounting_ops.h> |
1da177e4 | 58 | #include <linux/init.h> |
16f7e0fe | 59 | #include <linux/capability.h> |
1da177e4 | 60 | #include <linux/file.h> |
9f3acc31 | 61 | #include <linux/fdtable.h> |
94f8f3b0 | 62 | #include <linux/generic-radix-tree.h> |
1da177e4 LT |
63 | #include <linux/string.h> |
64 | #include <linux/seq_file.h> | |
65 | #include <linux/namei.h> | |
6b3286ed | 66 | #include <linux/mnt_namespace.h> |
1da177e4 | 67 | #include <linux/mm.h> |
a63d83f4 | 68 | #include <linux/swap.h> |
b835996f | 69 | #include <linux/rcupdate.h> |
1da177e4 | 70 | #include <linux/kallsyms.h> |
2ec220e2 | 71 | #include <linux/stacktrace.h> |
d85f50d5 | 72 | #include <linux/resource.h> |
5096add8 | 73 | #include <linux/module.h> |
1da177e4 LT |
74 | #include <linux/mount.h> |
75 | #include <linux/security.h> | |
76 | #include <linux/ptrace.h> | |
0d094efe | 77 | #include <linux/tracehook.h> |
87ebdc00 | 78 | #include <linux/printk.h> |
efb1a57d | 79 | #include <linux/cache.h> |
a424316c | 80 | #include <linux/cgroup.h> |
1da177e4 LT |
81 | #include <linux/cpuset.h> |
82 | #include <linux/audit.h> | |
5addc5dd | 83 | #include <linux/poll.h> |
1651e14e | 84 | #include <linux/nsproxy.h> |
8ac773b4 | 85 | #include <linux/oom.h> |
3cb4a0bb | 86 | #include <linux/elf.h> |
60347f67 | 87 | #include <linux/pid_namespace.h> |
22d917d8 | 88 | #include <linux/user_namespace.h> |
5ad4e53b | 89 | #include <linux/fs_struct.h> |
5a0e3ad6 | 90 | #include <linux/slab.h> |
4eb5aaa3 | 91 | #include <linux/sched/autogroup.h> |
6e84f315 | 92 | #include <linux/sched/mm.h> |
f7ccbae4 | 93 | #include <linux/sched/coredump.h> |
b17b0153 | 94 | #include <linux/sched/debug.h> |
3905f9ad | 95 | #include <linux/sched/stat.h> |
48f6a7a5 | 96 | #include <linux/posix-timers.h> |
04a8682a | 97 | #include <linux/time_namespace.h> |
e79f15a4 | 98 | #include <linux/resctrl.h> |
43d2b113 | 99 | #include <trace/events/oom.h> |
1da177e4 | 100 | #include "internal.h" |
faf60af1 | 101 | #include "fd.h" |
1da177e4 | 102 | |
ac7f1061 AD |
103 | #include "../../lib/kstrtox.h" |
104 | ||
0f2fe20f EB |
105 | /* NOTE: |
106 | * Implementing inode permission operations in /proc is almost | |
107 | * certainly an error. Permission checks need to happen during | |
108 | * each system call not at open time. The reason is that most of | |
109 | * what we wish to check for permissions in /proc varies at runtime. | |
110 | * | |
111 | * The classic example of a problem is opening file descriptors | |
112 | * in /proc for a task before it execs a suid executable. | |
113 | */ | |
114 | ||
efb1a57d AD |
115 | static u8 nlink_tid __ro_after_init; |
116 | static u8 nlink_tgid __ro_after_init; | |
1270dd8d | 117 | |
1da177e4 | 118 | struct pid_entry { |
cedbccab | 119 | const char *name; |
623f594e | 120 | unsigned int len; |
d161a13f | 121 | umode_t mode; |
c5ef1c42 | 122 | const struct inode_operations *iop; |
00977a59 | 123 | const struct file_operations *fop; |
20cdc894 | 124 | union proc_op op; |
1da177e4 LT |
125 | }; |
126 | ||
61a28784 | 127 | #define NOD(NAME, MODE, IOP, FOP, OP) { \ |
20cdc894 | 128 | .name = (NAME), \ |
c5141e6d | 129 | .len = sizeof(NAME) - 1, \ |
20cdc894 EB |
130 | .mode = MODE, \ |
131 | .iop = IOP, \ | |
132 | .fop = FOP, \ | |
133 | .op = OP, \ | |
134 | } | |
135 | ||
631f9c18 AD |
136 | #define DIR(NAME, MODE, iops, fops) \ |
137 | NOD(NAME, (S_IFDIR|(MODE)), &iops, &fops, {} ) | |
138 | #define LNK(NAME, get_link) \ | |
61a28784 | 139 | NOD(NAME, (S_IFLNK|S_IRWXUGO), \ |
20cdc894 | 140 | &proc_pid_link_inode_operations, NULL, \ |
631f9c18 AD |
141 | { .proc_get_link = get_link } ) |
142 | #define REG(NAME, MODE, fops) \ | |
143 | NOD(NAME, (S_IFREG|(MODE)), NULL, &fops, {}) | |
631f9c18 | 144 | #define ONE(NAME, MODE, show) \ |
6d9c939d | 145 | NOD(NAME, (S_IFREG|(MODE)), \ |
be614086 | 146 | NULL, &proc_single_file_operations, \ |
631f9c18 | 147 | { .proc_show = show } ) |
6d9c939d CS |
148 | #define ATTR(LSM, NAME, MODE) \ |
149 | NOD(NAME, (S_IFREG|(MODE)), \ | |
150 | NULL, &proc_pid_attr_operations, \ | |
151 | { .lsm = LSM }) | |
1da177e4 | 152 | |
aed54175 VN |
153 | /* |
154 | * Count the number of hardlinks for the pid_entry table, excluding the . | |
155 | * and .. links. | |
156 | */ | |
1270dd8d | 157 | static unsigned int __init pid_entry_nlink(const struct pid_entry *entries, |
aed54175 VN |
158 | unsigned int n) |
159 | { | |
160 | unsigned int i; | |
161 | unsigned int count; | |
162 | ||
1270dd8d | 163 | count = 2; |
aed54175 VN |
164 | for (i = 0; i < n; ++i) { |
165 | if (S_ISDIR(entries[i].mode)) | |
166 | ++count; | |
167 | } | |
168 | ||
169 | return count; | |
170 | } | |
171 | ||
f7ad3c6b | 172 | static int get_task_root(struct task_struct *task, struct path *root) |
1da177e4 | 173 | { |
7c2c7d99 HD |
174 | int result = -ENOENT; |
175 | ||
0494f6ec | 176 | task_lock(task); |
f7ad3c6b MS |
177 | if (task->fs) { |
178 | get_fs_root(task->fs, root); | |
7c2c7d99 HD |
179 | result = 0; |
180 | } | |
0494f6ec | 181 | task_unlock(task); |
7c2c7d99 | 182 | return result; |
0494f6ec MS |
183 | } |
184 | ||
7773fbc5 | 185 | static int proc_cwd_link(struct dentry *dentry, struct path *path) |
0494f6ec | 186 | { |
2b0143b5 | 187 | struct task_struct *task = get_proc_task(d_inode(dentry)); |
0494f6ec | 188 | int result = -ENOENT; |
99f89551 EB |
189 | |
190 | if (task) { | |
f7ad3c6b MS |
191 | task_lock(task); |
192 | if (task->fs) { | |
193 | get_fs_pwd(task->fs, path); | |
194 | result = 0; | |
195 | } | |
196 | task_unlock(task); | |
99f89551 EB |
197 | put_task_struct(task); |
198 | } | |
1da177e4 LT |
199 | return result; |
200 | } | |
201 | ||
7773fbc5 | 202 | static int proc_root_link(struct dentry *dentry, struct path *path) |
1da177e4 | 203 | { |
2b0143b5 | 204 | struct task_struct *task = get_proc_task(d_inode(dentry)); |
1da177e4 | 205 | int result = -ENOENT; |
99f89551 EB |
206 | |
207 | if (task) { | |
f7ad3c6b | 208 | result = get_task_root(task, path); |
99f89551 EB |
209 | put_task_struct(task); |
210 | } | |
1da177e4 LT |
211 | return result; |
212 | } | |
213 | ||
d26d0cd9 LT |
214 | /* |
215 | * If the user used setproctitle(), we just get the string from | |
216 | * user space at arg_start, and limit it to a maximum of one page. | |
217 | */ | |
218 | static ssize_t get_mm_proctitle(struct mm_struct *mm, char __user *buf, | |
219 | size_t count, unsigned long pos, | |
220 | unsigned long arg_start) | |
221 | { | |
222 | char *page; | |
223 | int ret, got; | |
224 | ||
225 | if (pos >= PAGE_SIZE) | |
226 | return 0; | |
227 | ||
228 | page = (char *)__get_free_page(GFP_KERNEL); | |
229 | if (!page) | |
230 | return -ENOMEM; | |
231 | ||
232 | ret = 0; | |
233 | got = access_remote_vm(mm, arg_start, page, PAGE_SIZE, FOLL_ANON); | |
234 | if (got > 0) { | |
235 | int len = strnlen(page, got); | |
236 | ||
237 | /* Include the NUL character if it was found */ | |
238 | if (len < got) | |
239 | len++; | |
240 | ||
241 | if (len > pos) { | |
242 | len -= pos; | |
243 | if (len > count) | |
244 | len = count; | |
245 | len -= copy_to_user(buf, page+pos, len); | |
246 | if (!len) | |
247 | len = -EFAULT; | |
248 | ret = len; | |
249 | } | |
250 | } | |
251 | free_page((unsigned long)page); | |
252 | return ret; | |
253 | } | |
254 | ||
e4b4e441 | 255 | static ssize_t get_mm_cmdline(struct mm_struct *mm, char __user *buf, |
5ab82718 | 256 | size_t count, loff_t *ppos) |
1da177e4 | 257 | { |
c2c0bb44 | 258 | unsigned long arg_start, arg_end, env_start, env_end; |
5ab82718 | 259 | unsigned long pos, len; |
d26d0cd9 | 260 | char *page, c; |
c2c0bb44 | 261 | |
c2c0bb44 | 262 | /* Check if process spawned far enough to have cmdline. */ |
e4b4e441 LT |
263 | if (!mm->env_end) |
264 | return 0; | |
c2c0bb44 | 265 | |
88aa7cc6 | 266 | spin_lock(&mm->arg_lock); |
c2c0bb44 AD |
267 | arg_start = mm->arg_start; |
268 | arg_end = mm->arg_end; | |
269 | env_start = mm->env_start; | |
270 | env_end = mm->env_end; | |
88aa7cc6 | 271 | spin_unlock(&mm->arg_lock); |
c2c0bb44 | 272 | |
5ab82718 LT |
273 | if (arg_start >= arg_end) |
274 | return 0; | |
6a6cbe75 | 275 | |
2ca66ff7 | 276 | /* |
d26d0cd9 LT |
277 | * We allow setproctitle() to overwrite the argument |
278 | * strings, and overflow past the original end. But | |
279 | * only when it overflows into the environment area. | |
2ca66ff7 | 280 | */ |
d26d0cd9 | 281 | if (env_start != arg_end || env_end < env_start) |
5ab82718 | 282 | env_start = env_end = arg_end; |
d26d0cd9 | 283 | len = env_end - arg_start; |
f5b65348 | 284 | |
5ab82718 | 285 | /* We're not going to care if "*ppos" has high bits set */ |
d26d0cd9 LT |
286 | pos = *ppos; |
287 | if (pos >= len) | |
5ab82718 | 288 | return 0; |
d26d0cd9 LT |
289 | if (count > len - pos) |
290 | count = len - pos; | |
291 | if (!count) | |
292 | return 0; | |
293 | ||
294 | /* | |
295 | * Magical special case: if the argv[] end byte is not | |
296 | * zero, the user has overwritten it with setproctitle(3). | |
297 | * | |
298 | * Possible future enhancement: do this only once when | |
299 | * pos is 0, and set a flag in the 'struct file'. | |
300 | */ | |
301 | if (access_remote_vm(mm, arg_end-1, &c, 1, FOLL_ANON) == 1 && c) | |
302 | return get_mm_proctitle(mm, buf, count, pos, arg_start); | |
a0a07b87 | 303 | |
d26d0cd9 LT |
304 | /* |
305 | * For the non-setproctitle() case we limit things strictly | |
306 | * to the [arg_start, arg_end[ range. | |
307 | */ | |
308 | pos += arg_start; | |
3d712546 | 309 | if (pos < arg_start || pos >= arg_end) |
5ab82718 | 310 | return 0; |
3d712546 LT |
311 | if (count > arg_end - pos) |
312 | count = arg_end - pos; | |
5ab82718 LT |
313 | |
314 | page = (char *)__get_free_page(GFP_KERNEL); | |
315 | if (!page) | |
316 | return -ENOMEM; | |
317 | ||
318 | len = 0; | |
319 | while (count) { | |
320 | int got; | |
321 | size_t size = min_t(size_t, PAGE_SIZE, count); | |
322 | ||
3d712546 LT |
323 | got = access_remote_vm(mm, pos, page, size, FOLL_ANON); |
324 | if (got <= 0) | |
5ab82718 | 325 | break; |
3d712546 | 326 | got -= copy_to_user(buf, page, got); |
5ab82718 LT |
327 | if (unlikely(!got)) { |
328 | if (!len) | |
329 | len = -EFAULT; | |
330 | break; | |
c2c0bb44 | 331 | } |
5ab82718 LT |
332 | pos += got; |
333 | buf += got; | |
334 | len += got; | |
335 | count -= got; | |
c2c0bb44 AD |
336 | } |
337 | ||
c2c0bb44 | 338 | free_page((unsigned long)page); |
5ab82718 | 339 | return len; |
1da177e4 LT |
340 | } |
341 | ||
e4b4e441 LT |
342 | static ssize_t get_task_cmdline(struct task_struct *tsk, char __user *buf, |
343 | size_t count, loff_t *pos) | |
344 | { | |
345 | struct mm_struct *mm; | |
346 | ssize_t ret; | |
347 | ||
348 | mm = get_task_mm(tsk); | |
349 | if (!mm) | |
350 | return 0; | |
351 | ||
352 | ret = get_mm_cmdline(mm, buf, count, pos); | |
c2c0bb44 | 353 | mmput(mm); |
e4b4e441 LT |
354 | return ret; |
355 | } | |
356 | ||
357 | static ssize_t proc_pid_cmdline_read(struct file *file, char __user *buf, | |
358 | size_t count, loff_t *pos) | |
359 | { | |
360 | struct task_struct *tsk; | |
361 | ssize_t ret; | |
362 | ||
363 | BUG_ON(*pos < 0); | |
364 | ||
365 | tsk = get_proc_task(file_inode(file)); | |
366 | if (!tsk) | |
367 | return -ESRCH; | |
368 | ret = get_task_cmdline(tsk, buf, count, pos); | |
369 | put_task_struct(tsk); | |
370 | if (ret > 0) | |
371 | *pos += ret; | |
372 | return ret; | |
1da177e4 LT |
373 | } |
374 | ||
c2c0bb44 AD |
375 | static const struct file_operations proc_pid_cmdline_ops = { |
376 | .read = proc_pid_cmdline_read, | |
377 | .llseek = generic_file_llseek, | |
378 | }; | |
379 | ||
1da177e4 LT |
380 | #ifdef CONFIG_KALLSYMS |
381 | /* | |
382 | * Provides a wchan file via kallsyms in a proper one-value-per-file format. | |
383 | * Returns the resolved symbol. If that fails, simply return the address. | |
384 | */ | |
edfcd606 AD |
385 | static int proc_pid_wchan(struct seq_file *m, struct pid_namespace *ns, |
386 | struct pid *pid, struct task_struct *task) | |
1da177e4 | 387 | { |
ffb45122 | 388 | unsigned long wchan; |
9281acea | 389 | char symname[KSYM_NAME_LEN]; |
1da177e4 | 390 | |
24b2ec21 AD |
391 | if (!ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS)) |
392 | goto print0; | |
1da177e4 | 393 | |
24b2ec21 AD |
394 | wchan = get_wchan(task); |
395 | if (wchan && !lookup_symbol_name(wchan, symname)) { | |
21dae0ad | 396 | seq_puts(m, symname); |
24b2ec21 AD |
397 | return 0; |
398 | } | |
25ce3191 | 399 | |
24b2ec21 AD |
400 | print0: |
401 | seq_putc(m, '0'); | |
25ce3191 | 402 | return 0; |
1da177e4 LT |
403 | } |
404 | #endif /* CONFIG_KALLSYMS */ | |
405 | ||
a9712bc1 AV |
406 | static int lock_trace(struct task_struct *task) |
407 | { | |
2db9dbf7 | 408 | int err = mutex_lock_killable(&task->signal->exec_update_mutex); |
a9712bc1 AV |
409 | if (err) |
410 | return err; | |
caaee623 | 411 | if (!ptrace_may_access(task, PTRACE_MODE_ATTACH_FSCREDS)) { |
2db9dbf7 | 412 | mutex_unlock(&task->signal->exec_update_mutex); |
a9712bc1 AV |
413 | return -EPERM; |
414 | } | |
415 | return 0; | |
416 | } | |
417 | ||
418 | static void unlock_trace(struct task_struct *task) | |
419 | { | |
2db9dbf7 | 420 | mutex_unlock(&task->signal->exec_update_mutex); |
a9712bc1 AV |
421 | } |
422 | ||
2ec220e2 KC |
423 | #ifdef CONFIG_STACKTRACE |
424 | ||
425 | #define MAX_STACK_TRACE_DEPTH 64 | |
426 | ||
427 | static int proc_pid_stack(struct seq_file *m, struct pid_namespace *ns, | |
428 | struct pid *pid, struct task_struct *task) | |
429 | { | |
2ec220e2 | 430 | unsigned long *entries; |
a9712bc1 | 431 | int err; |
2ec220e2 | 432 | |
f8a00cef JH |
433 | /* |
434 | * The ability to racily run the kernel stack unwinder on a running task | |
435 | * and then observe the unwinder output is scary; while it is useful for | |
436 | * debugging kernel issues, it can also allow an attacker to leak kernel | |
437 | * stack contents. | |
438 | * Doing this in a manner that is at least safe from races would require | |
439 | * some work to ensure that the remote task can not be scheduled; and | |
440 | * even then, this would still expose the unwinder as local attack | |
441 | * surface. | |
442 | * Therefore, this interface is restricted to root. | |
443 | */ | |
444 | if (!file_ns_capable(m->file, &init_user_ns, CAP_SYS_ADMIN)) | |
445 | return -EACCES; | |
446 | ||
6da2ec56 KC |
447 | entries = kmalloc_array(MAX_STACK_TRACE_DEPTH, sizeof(*entries), |
448 | GFP_KERNEL); | |
2ec220e2 KC |
449 | if (!entries) |
450 | return -ENOMEM; | |
451 | ||
a9712bc1 AV |
452 | err = lock_trace(task); |
453 | if (!err) { | |
e988e5ec | 454 | unsigned int i, nr_entries; |
5d008fb4 | 455 | |
e988e5ec TG |
456 | nr_entries = stack_trace_save_tsk(task, entries, |
457 | MAX_STACK_TRACE_DEPTH, 0); | |
a9712bc1 | 458 | |
e988e5ec | 459 | for (i = 0; i < nr_entries; i++) { |
8f5abe84 | 460 | seq_printf(m, "[<0>] %pB\n", (void *)entries[i]); |
a9712bc1 | 461 | } |
e988e5ec | 462 | |
a9712bc1 | 463 | unlock_trace(task); |
2ec220e2 KC |
464 | } |
465 | kfree(entries); | |
466 | ||
a9712bc1 | 467 | return err; |
2ec220e2 KC |
468 | } |
469 | #endif | |
470 | ||
5968cece | 471 | #ifdef CONFIG_SCHED_INFO |
1da177e4 LT |
472 | /* |
473 | * Provides /proc/PID/schedstat | |
474 | */ | |
f6e826ca AD |
475 | static int proc_pid_schedstat(struct seq_file *m, struct pid_namespace *ns, |
476 | struct pid *pid, struct task_struct *task) | |
1da177e4 | 477 | { |
5968cece | 478 | if (unlikely(!sched_info_on())) |
08b55775 | 479 | seq_puts(m, "0 0 0\n"); |
5968cece NR |
480 | else |
481 | seq_printf(m, "%llu %llu %lu\n", | |
25ce3191 JP |
482 | (unsigned long long)task->se.sum_exec_runtime, |
483 | (unsigned long long)task->sched_info.run_delay, | |
484 | task->sched_info.pcount); | |
485 | ||
486 | return 0; | |
1da177e4 LT |
487 | } |
488 | #endif | |
489 | ||
9745512c AV |
490 | #ifdef CONFIG_LATENCYTOP |
491 | static int lstats_show_proc(struct seq_file *m, void *v) | |
492 | { | |
493 | int i; | |
13d77c37 HS |
494 | struct inode *inode = m->private; |
495 | struct task_struct *task = get_proc_task(inode); | |
9745512c | 496 | |
13d77c37 HS |
497 | if (!task) |
498 | return -ESRCH; | |
499 | seq_puts(m, "Latency Top version : v0.1\n"); | |
f6d2f584 | 500 | for (i = 0; i < LT_SAVECOUNT; i++) { |
34e49d4f JP |
501 | struct latency_record *lr = &task->latency_record[i]; |
502 | if (lr->backtrace[0]) { | |
9745512c | 503 | int q; |
34e49d4f JP |
504 | seq_printf(m, "%i %li %li", |
505 | lr->count, lr->time, lr->max); | |
9745512c | 506 | for (q = 0; q < LT_BACKTRACEDEPTH; q++) { |
34e49d4f | 507 | unsigned long bt = lr->backtrace[q]; |
accddc41 | 508 | |
34e49d4f | 509 | if (!bt) |
9745512c | 510 | break; |
34e49d4f | 511 | seq_printf(m, " %ps", (void *)bt); |
9745512c | 512 | } |
9d6de12f | 513 | seq_putc(m, '\n'); |
9745512c AV |
514 | } |
515 | ||
516 | } | |
13d77c37 | 517 | put_task_struct(task); |
9745512c AV |
518 | return 0; |
519 | } | |
520 | ||
521 | static int lstats_open(struct inode *inode, struct file *file) | |
522 | { | |
13d77c37 | 523 | return single_open(file, lstats_show_proc, inode); |
d6643d12 HS |
524 | } |
525 | ||
9745512c AV |
526 | static ssize_t lstats_write(struct file *file, const char __user *buf, |
527 | size_t count, loff_t *offs) | |
528 | { | |
496ad9aa | 529 | struct task_struct *task = get_proc_task(file_inode(file)); |
9745512c | 530 | |
13d77c37 HS |
531 | if (!task) |
532 | return -ESRCH; | |
e02c9b0d | 533 | clear_tsk_latency_tracing(task); |
13d77c37 | 534 | put_task_struct(task); |
9745512c AV |
535 | |
536 | return count; | |
537 | } | |
538 | ||
539 | static const struct file_operations proc_lstats_operations = { | |
540 | .open = lstats_open, | |
541 | .read = seq_read, | |
542 | .write = lstats_write, | |
543 | .llseek = seq_lseek, | |
13d77c37 | 544 | .release = single_release, |
9745512c AV |
545 | }; |
546 | ||
547 | #endif | |
548 | ||
6ba51e37 AD |
549 | static int proc_oom_score(struct seq_file *m, struct pid_namespace *ns, |
550 | struct pid *pid, struct task_struct *task) | |
1da177e4 | 551 | { |
ca79b0c2 | 552 | unsigned long totalpages = totalram_pages() + total_swap_pages; |
b95c35e7 | 553 | unsigned long points = 0; |
1da177e4 | 554 | |
ac311a14 | 555 | points = oom_badness(task, totalpages) * 1000 / totalpages; |
25ce3191 JP |
556 | seq_printf(m, "%lu\n", points); |
557 | ||
558 | return 0; | |
1da177e4 LT |
559 | } |
560 | ||
d85f50d5 | 561 | struct limit_names { |
cedbccab AD |
562 | const char *name; |
563 | const char *unit; | |
d85f50d5 NH |
564 | }; |
565 | ||
566 | static const struct limit_names lnames[RLIM_NLIMITS] = { | |
cff4edb5 | 567 | [RLIMIT_CPU] = {"Max cpu time", "seconds"}, |
d85f50d5 NH |
568 | [RLIMIT_FSIZE] = {"Max file size", "bytes"}, |
569 | [RLIMIT_DATA] = {"Max data size", "bytes"}, | |
570 | [RLIMIT_STACK] = {"Max stack size", "bytes"}, | |
571 | [RLIMIT_CORE] = {"Max core file size", "bytes"}, | |
572 | [RLIMIT_RSS] = {"Max resident set", "bytes"}, | |
573 | [RLIMIT_NPROC] = {"Max processes", "processes"}, | |
574 | [RLIMIT_NOFILE] = {"Max open files", "files"}, | |
575 | [RLIMIT_MEMLOCK] = {"Max locked memory", "bytes"}, | |
576 | [RLIMIT_AS] = {"Max address space", "bytes"}, | |
577 | [RLIMIT_LOCKS] = {"Max file locks", "locks"}, | |
578 | [RLIMIT_SIGPENDING] = {"Max pending signals", "signals"}, | |
579 | [RLIMIT_MSGQUEUE] = {"Max msgqueue size", "bytes"}, | |
580 | [RLIMIT_NICE] = {"Max nice priority", NULL}, | |
581 | [RLIMIT_RTPRIO] = {"Max realtime priority", NULL}, | |
8808117c | 582 | [RLIMIT_RTTIME] = {"Max realtime timeout", "us"}, |
d85f50d5 NH |
583 | }; |
584 | ||
585 | /* Display limits for a process */ | |
1c963eb1 AD |
586 | static int proc_pid_limits(struct seq_file *m, struct pid_namespace *ns, |
587 | struct pid *pid, struct task_struct *task) | |
d85f50d5 NH |
588 | { |
589 | unsigned int i; | |
d85f50d5 | 590 | unsigned long flags; |
d85f50d5 NH |
591 | |
592 | struct rlimit rlim[RLIM_NLIMITS]; | |
593 | ||
a6bebbc8 | 594 | if (!lock_task_sighand(task, &flags)) |
d85f50d5 | 595 | return 0; |
d85f50d5 NH |
596 | memcpy(rlim, task->signal->rlim, sizeof(struct rlimit) * RLIM_NLIMITS); |
597 | unlock_task_sighand(task, &flags); | |
d85f50d5 NH |
598 | |
599 | /* | |
600 | * print the file header | |
601 | */ | |
afe922c2 AD |
602 | seq_puts(m, "Limit " |
603 | "Soft Limit " | |
604 | "Hard Limit " | |
605 | "Units \n"); | |
d85f50d5 NH |
606 | |
607 | for (i = 0; i < RLIM_NLIMITS; i++) { | |
608 | if (rlim[i].rlim_cur == RLIM_INFINITY) | |
1c963eb1 | 609 | seq_printf(m, "%-25s %-20s ", |
25ce3191 | 610 | lnames[i].name, "unlimited"); |
d85f50d5 | 611 | else |
1c963eb1 | 612 | seq_printf(m, "%-25s %-20lu ", |
25ce3191 | 613 | lnames[i].name, rlim[i].rlim_cur); |
d85f50d5 NH |
614 | |
615 | if (rlim[i].rlim_max == RLIM_INFINITY) | |
1c963eb1 | 616 | seq_printf(m, "%-20s ", "unlimited"); |
d85f50d5 | 617 | else |
1c963eb1 | 618 | seq_printf(m, "%-20lu ", rlim[i].rlim_max); |
d85f50d5 NH |
619 | |
620 | if (lnames[i].unit) | |
1c963eb1 | 621 | seq_printf(m, "%-10s\n", lnames[i].unit); |
d85f50d5 | 622 | else |
1c963eb1 | 623 | seq_putc(m, '\n'); |
d85f50d5 NH |
624 | } |
625 | ||
1c963eb1 | 626 | return 0; |
d85f50d5 NH |
627 | } |
628 | ||
ebcb6734 | 629 | #ifdef CONFIG_HAVE_ARCH_TRACEHOOK |
09d93bd6 AD |
630 | static int proc_pid_syscall(struct seq_file *m, struct pid_namespace *ns, |
631 | struct pid *pid, struct task_struct *task) | |
ebcb6734 | 632 | { |
631b7aba SRRH |
633 | struct syscall_info info; |
634 | u64 *args = &info.data.args[0]; | |
25ce3191 JP |
635 | int res; |
636 | ||
637 | res = lock_trace(task); | |
a9712bc1 AV |
638 | if (res) |
639 | return res; | |
ebcb6734 | 640 | |
631b7aba | 641 | if (task_current_syscall(task, &info)) |
09d93bd6 | 642 | seq_puts(m, "running\n"); |
631b7aba SRRH |
643 | else if (info.data.nr < 0) |
644 | seq_printf(m, "%d 0x%llx 0x%llx\n", | |
645 | info.data.nr, info.sp, info.data.instruction_pointer); | |
a9712bc1 | 646 | else |
09d93bd6 | 647 | seq_printf(m, |
631b7aba SRRH |
648 | "%d 0x%llx 0x%llx 0x%llx 0x%llx 0x%llx 0x%llx 0x%llx 0x%llx\n", |
649 | info.data.nr, | |
ebcb6734 | 650 | args[0], args[1], args[2], args[3], args[4], args[5], |
631b7aba | 651 | info.sp, info.data.instruction_pointer); |
a9712bc1 | 652 | unlock_trace(task); |
25ce3191 JP |
653 | |
654 | return 0; | |
ebcb6734 RM |
655 | } |
656 | #endif /* CONFIG_HAVE_ARCH_TRACEHOOK */ | |
657 | ||
1da177e4 LT |
658 | /************************************************************************/ |
659 | /* Here the fs part begins */ | |
660 | /************************************************************************/ | |
661 | ||
662 | /* permission checks */ | |
778c1144 | 663 | static int proc_fd_access_allowed(struct inode *inode) |
1da177e4 | 664 | { |
778c1144 EB |
665 | struct task_struct *task; |
666 | int allowed = 0; | |
df26c40e EB |
667 | /* Allow access to a task's file descriptors if it is us or we |
668 | * may use ptrace attach to the process and find out that | |
669 | * information. | |
778c1144 EB |
670 | */ |
671 | task = get_proc_task(inode); | |
df26c40e | 672 | if (task) { |
caaee623 | 673 | allowed = ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS); |
778c1144 | 674 | put_task_struct(task); |
df26c40e | 675 | } |
778c1144 | 676 | return allowed; |
1da177e4 LT |
677 | } |
678 | ||
6b4e306a | 679 | int proc_setattr(struct dentry *dentry, struct iattr *attr) |
6d76fa58 LT |
680 | { |
681 | int error; | |
2b0143b5 | 682 | struct inode *inode = d_inode(dentry); |
6d76fa58 LT |
683 | |
684 | if (attr->ia_valid & ATTR_MODE) | |
685 | return -EPERM; | |
686 | ||
31051c85 | 687 | error = setattr_prepare(dentry, attr); |
1025774c CH |
688 | if (error) |
689 | return error; | |
690 | ||
1025774c CH |
691 | setattr_copy(inode, attr); |
692 | mark_inode_dirty(inode); | |
693 | return 0; | |
6d76fa58 LT |
694 | } |
695 | ||
0499680a VK |
696 | /* |
697 | * May current process learn task's sched/cmdline info (for hide_pid_min=1) | |
698 | * or euid/egid (for hide_pid_min=2)? | |
699 | */ | |
fa10fed3 | 700 | static bool has_pid_permissions(struct proc_fs_info *fs_info, |
0499680a | 701 | struct task_struct *task, |
e61bb8b3 | 702 | enum proc_hidepid hide_pid_min) |
0499680a | 703 | { |
24a71ce5 AG |
704 | /* |
705 | * If 'hidpid' mount option is set force a ptrace check, | |
706 | * we indicate that we are using a filesystem syscall | |
707 | * by passing PTRACE_MODE_READ_FSCREDS | |
708 | */ | |
709 | if (fs_info->hide_pid == HIDEPID_NOT_PTRACEABLE) | |
710 | return ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS); | |
711 | ||
fa10fed3 | 712 | if (fs_info->hide_pid < hide_pid_min) |
0499680a | 713 | return true; |
fa10fed3 | 714 | if (in_group_p(fs_info->pid_gid)) |
0499680a | 715 | return true; |
caaee623 | 716 | return ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS); |
0499680a VK |
717 | } |
718 | ||
719 | ||
720 | static int proc_pid_permission(struct inode *inode, int mask) | |
721 | { | |
fa10fed3 | 722 | struct proc_fs_info *fs_info = proc_sb_info(inode->i_sb); |
0499680a VK |
723 | struct task_struct *task; |
724 | bool has_perms; | |
725 | ||
726 | task = get_proc_task(inode); | |
a2ef990a XF |
727 | if (!task) |
728 | return -ESRCH; | |
fa10fed3 | 729 | has_perms = has_pid_permissions(fs_info, task, HIDEPID_NO_ACCESS); |
0499680a VK |
730 | put_task_struct(task); |
731 | ||
732 | if (!has_perms) { | |
fa10fed3 | 733 | if (fs_info->hide_pid == HIDEPID_INVISIBLE) { |
0499680a VK |
734 | /* |
735 | * Let's make getdents(), stat(), and open() | |
736 | * consistent with each other. If a process | |
737 | * may not stat() a file, it shouldn't be seen | |
738 | * in procfs at all. | |
739 | */ | |
740 | return -ENOENT; | |
741 | } | |
742 | ||
743 | return -EPERM; | |
744 | } | |
745 | return generic_permission(inode, mask); | |
746 | } | |
747 | ||
748 | ||
749 | ||
c5ef1c42 | 750 | static const struct inode_operations proc_def_inode_operations = { |
6d76fa58 LT |
751 | .setattr = proc_setattr, |
752 | }; | |
753 | ||
be614086 EB |
754 | static int proc_single_show(struct seq_file *m, void *v) |
755 | { | |
756 | struct inode *inode = m->private; | |
9d78edea | 757 | struct pid_namespace *ns = proc_pid_ns(inode->i_sb); |
76f668be | 758 | struct pid *pid = proc_pid(inode); |
be614086 EB |
759 | struct task_struct *task; |
760 | int ret; | |
761 | ||
be614086 EB |
762 | task = get_pid_task(pid, PIDTYPE_PID); |
763 | if (!task) | |
764 | return -ESRCH; | |
765 | ||
766 | ret = PROC_I(inode)->op.proc_show(m, ns, pid, task); | |
767 | ||
768 | put_task_struct(task); | |
769 | return ret; | |
770 | } | |
771 | ||
772 | static int proc_single_open(struct inode *inode, struct file *filp) | |
773 | { | |
c6a34058 | 774 | return single_open(filp, proc_single_show, inode); |
be614086 EB |
775 | } |
776 | ||
777 | static const struct file_operations proc_single_file_operations = { | |
778 | .open = proc_single_open, | |
779 | .read = seq_read, | |
780 | .llseek = seq_lseek, | |
781 | .release = single_release, | |
782 | }; | |
783 | ||
5381e169 ON |
784 | |
785 | struct mm_struct *proc_mem_open(struct inode *inode, unsigned int mode) | |
1da177e4 | 786 | { |
5381e169 ON |
787 | struct task_struct *task = get_proc_task(inode); |
788 | struct mm_struct *mm = ERR_PTR(-ESRCH); | |
e268337d | 789 | |
5381e169 | 790 | if (task) { |
caaee623 | 791 | mm = mm_access(task, mode | PTRACE_MODE_FSCREDS); |
5381e169 | 792 | put_task_struct(task); |
e268337d | 793 | |
5381e169 ON |
794 | if (!IS_ERR_OR_NULL(mm)) { |
795 | /* ensure this mm_struct can't be freed */ | |
f1f10076 | 796 | mmgrab(mm); |
5381e169 ON |
797 | /* but do not pin its memory */ |
798 | mmput(mm); | |
799 | } | |
800 | } | |
801 | ||
802 | return mm; | |
803 | } | |
804 | ||
805 | static int __mem_open(struct inode *inode, struct file *file, unsigned int mode) | |
806 | { | |
807 | struct mm_struct *mm = proc_mem_open(inode, mode); | |
e268337d LT |
808 | |
809 | if (IS_ERR(mm)) | |
810 | return PTR_ERR(mm); | |
811 | ||
e268337d | 812 | file->private_data = mm; |
1da177e4 LT |
813 | return 0; |
814 | } | |
815 | ||
b409e578 CW |
816 | static int mem_open(struct inode *inode, struct file *file) |
817 | { | |
bc452b4b DH |
818 | int ret = __mem_open(inode, file, PTRACE_MODE_ATTACH); |
819 | ||
820 | /* OK to pass negative loff_t, we can catch out-of-range */ | |
821 | file->f_mode |= FMODE_UNSIGNED_OFFSET; | |
822 | ||
823 | return ret; | |
b409e578 CW |
824 | } |
825 | ||
572d34b9 ON |
826 | static ssize_t mem_rw(struct file *file, char __user *buf, |
827 | size_t count, loff_t *ppos, int write) | |
1da177e4 | 828 | { |
e268337d | 829 | struct mm_struct *mm = file->private_data; |
572d34b9 ON |
830 | unsigned long addr = *ppos; |
831 | ssize_t copied; | |
1da177e4 | 832 | char *page; |
272ddc8b | 833 | unsigned int flags; |
1da177e4 | 834 | |
e268337d LT |
835 | if (!mm) |
836 | return 0; | |
99f89551 | 837 | |
0ee931c4 | 838 | page = (char *)__get_free_page(GFP_KERNEL); |
30cd8903 | 839 | if (!page) |
e268337d | 840 | return -ENOMEM; |
1da177e4 | 841 | |
f7ca54f4 | 842 | copied = 0; |
388f7934 | 843 | if (!mmget_not_zero(mm)) |
6d08f2c7 ON |
844 | goto free; |
845 | ||
f511c0b1 | 846 | flags = FOLL_FORCE | (write ? FOLL_WRITE : 0); |
6347e8d5 | 847 | |
1da177e4 | 848 | while (count > 0) { |
572d34b9 | 849 | int this_len = min_t(int, count, PAGE_SIZE); |
1da177e4 | 850 | |
572d34b9 | 851 | if (write && copy_from_user(page, buf, this_len)) { |
1da177e4 LT |
852 | copied = -EFAULT; |
853 | break; | |
854 | } | |
572d34b9 | 855 | |
6347e8d5 | 856 | this_len = access_remote_vm(mm, addr, page, this_len, flags); |
572d34b9 | 857 | if (!this_len) { |
1da177e4 LT |
858 | if (!copied) |
859 | copied = -EIO; | |
860 | break; | |
861 | } | |
572d34b9 ON |
862 | |
863 | if (!write && copy_to_user(buf, page, this_len)) { | |
864 | copied = -EFAULT; | |
865 | break; | |
866 | } | |
867 | ||
868 | buf += this_len; | |
869 | addr += this_len; | |
870 | copied += this_len; | |
871 | count -= this_len; | |
1da177e4 | 872 | } |
572d34b9 | 873 | *ppos = addr; |
30cd8903 | 874 | |
6d08f2c7 ON |
875 | mmput(mm); |
876 | free: | |
30cd8903 | 877 | free_page((unsigned long) page); |
1da177e4 LT |
878 | return copied; |
879 | } | |
1da177e4 | 880 | |
572d34b9 ON |
881 | static ssize_t mem_read(struct file *file, char __user *buf, |
882 | size_t count, loff_t *ppos) | |
883 | { | |
884 | return mem_rw(file, buf, count, ppos, 0); | |
885 | } | |
886 | ||
887 | static ssize_t mem_write(struct file *file, const char __user *buf, | |
888 | size_t count, loff_t *ppos) | |
889 | { | |
890 | return mem_rw(file, (char __user*)buf, count, ppos, 1); | |
891 | } | |
892 | ||
85863e47 | 893 | loff_t mem_lseek(struct file *file, loff_t offset, int orig) |
1da177e4 LT |
894 | { |
895 | switch (orig) { | |
896 | case 0: | |
897 | file->f_pos = offset; | |
898 | break; | |
899 | case 1: | |
900 | file->f_pos += offset; | |
901 | break; | |
902 | default: | |
903 | return -EINVAL; | |
904 | } | |
905 | force_successful_syscall_return(); | |
906 | return file->f_pos; | |
907 | } | |
908 | ||
e268337d LT |
909 | static int mem_release(struct inode *inode, struct file *file) |
910 | { | |
911 | struct mm_struct *mm = file->private_data; | |
71879d3c | 912 | if (mm) |
6d08f2c7 | 913 | mmdrop(mm); |
e268337d LT |
914 | return 0; |
915 | } | |
916 | ||
00977a59 | 917 | static const struct file_operations proc_mem_operations = { |
1da177e4 LT |
918 | .llseek = mem_lseek, |
919 | .read = mem_read, | |
920 | .write = mem_write, | |
921 | .open = mem_open, | |
e268337d | 922 | .release = mem_release, |
1da177e4 LT |
923 | }; |
924 | ||
b409e578 CW |
925 | static int environ_open(struct inode *inode, struct file *file) |
926 | { | |
927 | return __mem_open(inode, file, PTRACE_MODE_READ); | |
928 | } | |
929 | ||
315e28c8 JP |
930 | static ssize_t environ_read(struct file *file, char __user *buf, |
931 | size_t count, loff_t *ppos) | |
932 | { | |
315e28c8 JP |
933 | char *page; |
934 | unsigned long src = *ppos; | |
b409e578 CW |
935 | int ret = 0; |
936 | struct mm_struct *mm = file->private_data; | |
a3b609ef | 937 | unsigned long env_start, env_end; |
315e28c8 | 938 | |
8148a73c MK |
939 | /* Ensure the process spawned far enough to have an environment. */ |
940 | if (!mm || !mm->env_end) | |
b409e578 | 941 | return 0; |
315e28c8 | 942 | |
0ee931c4 | 943 | page = (char *)__get_free_page(GFP_KERNEL); |
315e28c8 | 944 | if (!page) |
b409e578 | 945 | return -ENOMEM; |
315e28c8 | 946 | |
d6f64b89 | 947 | ret = 0; |
388f7934 | 948 | if (!mmget_not_zero(mm)) |
b409e578 | 949 | goto free; |
a3b609ef | 950 | |
88aa7cc6 | 951 | spin_lock(&mm->arg_lock); |
a3b609ef MG |
952 | env_start = mm->env_start; |
953 | env_end = mm->env_end; | |
88aa7cc6 | 954 | spin_unlock(&mm->arg_lock); |
a3b609ef | 955 | |
315e28c8 | 956 | while (count > 0) { |
e8905ec2 DH |
957 | size_t this_len, max_len; |
958 | int retval; | |
315e28c8 | 959 | |
a3b609ef | 960 | if (src >= (env_end - env_start)) |
315e28c8 JP |
961 | break; |
962 | ||
a3b609ef | 963 | this_len = env_end - (env_start + src); |
e8905ec2 DH |
964 | |
965 | max_len = min_t(size_t, PAGE_SIZE, count); | |
966 | this_len = min(max_len, this_len); | |
315e28c8 | 967 | |
7f7ccc2c | 968 | retval = access_remote_vm(mm, (env_start + src), page, this_len, FOLL_ANON); |
315e28c8 JP |
969 | |
970 | if (retval <= 0) { | |
971 | ret = retval; | |
972 | break; | |
973 | } | |
974 | ||
975 | if (copy_to_user(buf, page, retval)) { | |
976 | ret = -EFAULT; | |
977 | break; | |
978 | } | |
979 | ||
980 | ret += retval; | |
981 | src += retval; | |
982 | buf += retval; | |
983 | count -= retval; | |
984 | } | |
985 | *ppos = src; | |
315e28c8 | 986 | mmput(mm); |
b409e578 CW |
987 | |
988 | free: | |
315e28c8 | 989 | free_page((unsigned long) page); |
315e28c8 JP |
990 | return ret; |
991 | } | |
992 | ||
993 | static const struct file_operations proc_environ_operations = { | |
b409e578 | 994 | .open = environ_open, |
315e28c8 | 995 | .read = environ_read, |
87df8424 | 996 | .llseek = generic_file_llseek, |
b409e578 | 997 | .release = mem_release, |
315e28c8 JP |
998 | }; |
999 | ||
c5317167 AV |
1000 | static int auxv_open(struct inode *inode, struct file *file) |
1001 | { | |
1002 | return __mem_open(inode, file, PTRACE_MODE_READ_FSCREDS); | |
1003 | } | |
1004 | ||
1005 | static ssize_t auxv_read(struct file *file, char __user *buf, | |
1006 | size_t count, loff_t *ppos) | |
1007 | { | |
1008 | struct mm_struct *mm = file->private_data; | |
1009 | unsigned int nwords = 0; | |
06b2849d LY |
1010 | |
1011 | if (!mm) | |
1012 | return 0; | |
c5317167 AV |
1013 | do { |
1014 | nwords += 2; | |
1015 | } while (mm->saved_auxv[nwords - 2] != 0); /* AT_NULL */ | |
1016 | return simple_read_from_buffer(buf, count, ppos, mm->saved_auxv, | |
1017 | nwords * sizeof(mm->saved_auxv[0])); | |
1018 | } | |
1019 | ||
1020 | static const struct file_operations proc_auxv_operations = { | |
1021 | .open = auxv_open, | |
1022 | .read = auxv_read, | |
1023 | .llseek = generic_file_llseek, | |
1024 | .release = mem_release, | |
1025 | }; | |
1026 | ||
fa0cbbf1 DR |
1027 | static ssize_t oom_adj_read(struct file *file, char __user *buf, size_t count, |
1028 | loff_t *ppos) | |
1029 | { | |
496ad9aa | 1030 | struct task_struct *task = get_proc_task(file_inode(file)); |
fa0cbbf1 DR |
1031 | char buffer[PROC_NUMBUF]; |
1032 | int oom_adj = OOM_ADJUST_MIN; | |
1033 | size_t len; | |
fa0cbbf1 DR |
1034 | |
1035 | if (!task) | |
1036 | return -ESRCH; | |
f913da59 MH |
1037 | if (task->signal->oom_score_adj == OOM_SCORE_ADJ_MAX) |
1038 | oom_adj = OOM_ADJUST_MAX; | |
1039 | else | |
1040 | oom_adj = (task->signal->oom_score_adj * -OOM_DISABLE) / | |
1041 | OOM_SCORE_ADJ_MAX; | |
fa0cbbf1 DR |
1042 | put_task_struct(task); |
1043 | len = snprintf(buffer, sizeof(buffer), "%d\n", oom_adj); | |
1044 | return simple_read_from_buffer(buf, count, ppos, buffer, len); | |
1045 | } | |
1046 | ||
1d5f0acb MH |
1047 | static int __set_oom_adj(struct file *file, int oom_adj, bool legacy) |
1048 | { | |
1049 | static DEFINE_MUTEX(oom_adj_mutex); | |
44a70ade | 1050 | struct mm_struct *mm = NULL; |
1d5f0acb MH |
1051 | struct task_struct *task; |
1052 | int err = 0; | |
1053 | ||
1054 | task = get_proc_task(file_inode(file)); | |
1055 | if (!task) | |
1056 | return -ESRCH; | |
1057 | ||
1058 | mutex_lock(&oom_adj_mutex); | |
1059 | if (legacy) { | |
1060 | if (oom_adj < task->signal->oom_score_adj && | |
1061 | !capable(CAP_SYS_RESOURCE)) { | |
1062 | err = -EACCES; | |
1063 | goto err_unlock; | |
1064 | } | |
1065 | /* | |
1066 | * /proc/pid/oom_adj is provided for legacy purposes, ask users to use | |
1067 | * /proc/pid/oom_score_adj instead. | |
1068 | */ | |
1069 | pr_warn_once("%s (%d): /proc/%d/oom_adj is deprecated, please use /proc/%d/oom_score_adj instead.\n", | |
1070 | current->comm, task_pid_nr(current), task_pid_nr(task), | |
1071 | task_pid_nr(task)); | |
1072 | } else { | |
1073 | if ((short)oom_adj < task->signal->oom_score_adj_min && | |
1074 | !capable(CAP_SYS_RESOURCE)) { | |
1075 | err = -EACCES; | |
1076 | goto err_unlock; | |
1077 | } | |
1078 | } | |
1079 | ||
44a70ade MH |
1080 | /* |
1081 | * Make sure we will check other processes sharing the mm if this is | |
1082 | * not vfrok which wants its own oom_score_adj. | |
1083 | * pin the mm so it doesn't go away and get reused after task_unlock | |
1084 | */ | |
1085 | if (!task->vfork_done) { | |
1086 | struct task_struct *p = find_lock_task_mm(task); | |
1087 | ||
1088 | if (p) { | |
1089 | if (atomic_read(&p->mm->mm_users) > 1) { | |
1090 | mm = p->mm; | |
f1f10076 | 1091 | mmgrab(mm); |
44a70ade MH |
1092 | } |
1093 | task_unlock(p); | |
1094 | } | |
1095 | } | |
1096 | ||
1d5f0acb MH |
1097 | task->signal->oom_score_adj = oom_adj; |
1098 | if (!legacy && has_capability_noaudit(current, CAP_SYS_RESOURCE)) | |
1099 | task->signal->oom_score_adj_min = (short)oom_adj; | |
1100 | trace_oom_score_adj_update(task); | |
44a70ade MH |
1101 | |
1102 | if (mm) { | |
1103 | struct task_struct *p; | |
1104 | ||
1105 | rcu_read_lock(); | |
1106 | for_each_process(p) { | |
1107 | if (same_thread_group(task, p)) | |
1108 | continue; | |
1109 | ||
1110 | /* do not touch kernel threads or the global init */ | |
1111 | if (p->flags & PF_KTHREAD || is_global_init(p)) | |
1112 | continue; | |
1113 | ||
1114 | task_lock(p); | |
1115 | if (!p->vfork_done && process_shares_mm(p, mm)) { | |
44a70ade MH |
1116 | p->signal->oom_score_adj = oom_adj; |
1117 | if (!legacy && has_capability_noaudit(current, CAP_SYS_RESOURCE)) | |
1118 | p->signal->oom_score_adj_min = (short)oom_adj; | |
1119 | } | |
1120 | task_unlock(p); | |
1121 | } | |
1122 | rcu_read_unlock(); | |
1123 | mmdrop(mm); | |
1124 | } | |
1d5f0acb MH |
1125 | err_unlock: |
1126 | mutex_unlock(&oom_adj_mutex); | |
1127 | put_task_struct(task); | |
1128 | return err; | |
1129 | } | |
f913da59 | 1130 | |
b72bdfa7 DR |
1131 | /* |
1132 | * /proc/pid/oom_adj exists solely for backwards compatibility with previous | |
1133 | * kernels. The effective policy is defined by oom_score_adj, which has a | |
1134 | * different scale: oom_adj grew exponentially and oom_score_adj grows linearly. | |
1135 | * Values written to oom_adj are simply mapped linearly to oom_score_adj. | |
1136 | * Processes that become oom disabled via oom_adj will still be oom disabled | |
1137 | * with this implementation. | |
1138 | * | |
1139 | * oom_adj cannot be removed since existing userspace binaries use it. | |
1140 | */ | |
fa0cbbf1 DR |
1141 | static ssize_t oom_adj_write(struct file *file, const char __user *buf, |
1142 | size_t count, loff_t *ppos) | |
1143 | { | |
fa0cbbf1 DR |
1144 | char buffer[PROC_NUMBUF]; |
1145 | int oom_adj; | |
fa0cbbf1 DR |
1146 | int err; |
1147 | ||
1148 | memset(buffer, 0, sizeof(buffer)); | |
1149 | if (count > sizeof(buffer) - 1) | |
1150 | count = sizeof(buffer) - 1; | |
1151 | if (copy_from_user(buffer, buf, count)) { | |
1152 | err = -EFAULT; | |
1153 | goto out; | |
1154 | } | |
1155 | ||
1156 | err = kstrtoint(strstrip(buffer), 0, &oom_adj); | |
1157 | if (err) | |
1158 | goto out; | |
1159 | if ((oom_adj < OOM_ADJUST_MIN || oom_adj > OOM_ADJUST_MAX) && | |
1160 | oom_adj != OOM_DISABLE) { | |
1161 | err = -EINVAL; | |
1162 | goto out; | |
1163 | } | |
1164 | ||
fa0cbbf1 DR |
1165 | /* |
1166 | * Scale /proc/pid/oom_score_adj appropriately ensuring that a maximum | |
1167 | * value is always attainable. | |
1168 | */ | |
1169 | if (oom_adj == OOM_ADJUST_MAX) | |
1170 | oom_adj = OOM_SCORE_ADJ_MAX; | |
1171 | else | |
1172 | oom_adj = (oom_adj * OOM_SCORE_ADJ_MAX) / -OOM_DISABLE; | |
1173 | ||
1d5f0acb | 1174 | err = __set_oom_adj(file, oom_adj, true); |
fa0cbbf1 DR |
1175 | out: |
1176 | return err < 0 ? err : count; | |
1177 | } | |
1178 | ||
1179 | static const struct file_operations proc_oom_adj_operations = { | |
1180 | .read = oom_adj_read, | |
1181 | .write = oom_adj_write, | |
1182 | .llseek = generic_file_llseek, | |
1183 | }; | |
1184 | ||
a63d83f4 DR |
1185 | static ssize_t oom_score_adj_read(struct file *file, char __user *buf, |
1186 | size_t count, loff_t *ppos) | |
1187 | { | |
496ad9aa | 1188 | struct task_struct *task = get_proc_task(file_inode(file)); |
a63d83f4 | 1189 | char buffer[PROC_NUMBUF]; |
a9c58b90 | 1190 | short oom_score_adj = OOM_SCORE_ADJ_MIN; |
a63d83f4 DR |
1191 | size_t len; |
1192 | ||
1193 | if (!task) | |
1194 | return -ESRCH; | |
f913da59 | 1195 | oom_score_adj = task->signal->oom_score_adj; |
a63d83f4 | 1196 | put_task_struct(task); |
a9c58b90 | 1197 | len = snprintf(buffer, sizeof(buffer), "%hd\n", oom_score_adj); |
a63d83f4 DR |
1198 | return simple_read_from_buffer(buf, count, ppos, buffer, len); |
1199 | } | |
1200 | ||
1201 | static ssize_t oom_score_adj_write(struct file *file, const char __user *buf, | |
1202 | size_t count, loff_t *ppos) | |
1203 | { | |
a63d83f4 | 1204 | char buffer[PROC_NUMBUF]; |
0a8cb8e3 | 1205 | int oom_score_adj; |
a63d83f4 DR |
1206 | int err; |
1207 | ||
1208 | memset(buffer, 0, sizeof(buffer)); | |
1209 | if (count > sizeof(buffer) - 1) | |
1210 | count = sizeof(buffer) - 1; | |
723548bf DR |
1211 | if (copy_from_user(buffer, buf, count)) { |
1212 | err = -EFAULT; | |
1213 | goto out; | |
1214 | } | |
a63d83f4 | 1215 | |
0a8cb8e3 | 1216 | err = kstrtoint(strstrip(buffer), 0, &oom_score_adj); |
a63d83f4 | 1217 | if (err) |
723548bf | 1218 | goto out; |
a63d83f4 | 1219 | if (oom_score_adj < OOM_SCORE_ADJ_MIN || |
723548bf DR |
1220 | oom_score_adj > OOM_SCORE_ADJ_MAX) { |
1221 | err = -EINVAL; | |
1222 | goto out; | |
1223 | } | |
a63d83f4 | 1224 | |
1d5f0acb | 1225 | err = __set_oom_adj(file, oom_score_adj, false); |
723548bf DR |
1226 | out: |
1227 | return err < 0 ? err : count; | |
a63d83f4 DR |
1228 | } |
1229 | ||
1230 | static const struct file_operations proc_oom_score_adj_operations = { | |
1231 | .read = oom_score_adj_read, | |
1232 | .write = oom_score_adj_write, | |
6038f373 | 1233 | .llseek = default_llseek, |
a63d83f4 DR |
1234 | }; |
1235 | ||
4b7d248b | 1236 | #ifdef CONFIG_AUDIT |
b4eb4f7f | 1237 | #define TMPBUFLEN 11 |
1da177e4 LT |
1238 | static ssize_t proc_loginuid_read(struct file * file, char __user * buf, |
1239 | size_t count, loff_t *ppos) | |
1240 | { | |
496ad9aa | 1241 | struct inode * inode = file_inode(file); |
99f89551 | 1242 | struct task_struct *task = get_proc_task(inode); |
1da177e4 LT |
1243 | ssize_t length; |
1244 | char tmpbuf[TMPBUFLEN]; | |
1245 | ||
99f89551 EB |
1246 | if (!task) |
1247 | return -ESRCH; | |
1da177e4 | 1248 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", |
e1760bd5 EB |
1249 | from_kuid(file->f_cred->user_ns, |
1250 | audit_get_loginuid(task))); | |
99f89551 | 1251 | put_task_struct(task); |
1da177e4 LT |
1252 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); |
1253 | } | |
1254 | ||
1255 | static ssize_t proc_loginuid_write(struct file * file, const char __user * buf, | |
1256 | size_t count, loff_t *ppos) | |
1257 | { | |
496ad9aa | 1258 | struct inode * inode = file_inode(file); |
1da177e4 | 1259 | uid_t loginuid; |
e1760bd5 | 1260 | kuid_t kloginuid; |
774636e1 | 1261 | int rv; |
1da177e4 | 1262 | |
7dc52157 PM |
1263 | rcu_read_lock(); |
1264 | if (current != pid_task(proc_pid(inode), PIDTYPE_PID)) { | |
1265 | rcu_read_unlock(); | |
1da177e4 | 1266 | return -EPERM; |
7dc52157 PM |
1267 | } |
1268 | rcu_read_unlock(); | |
1da177e4 | 1269 | |
1da177e4 LT |
1270 | if (*ppos != 0) { |
1271 | /* No partial writes. */ | |
1272 | return -EINVAL; | |
1273 | } | |
1da177e4 | 1274 | |
774636e1 AD |
1275 | rv = kstrtou32_from_user(buf, count, 10, &loginuid); |
1276 | if (rv < 0) | |
1277 | return rv; | |
81407c84 EP |
1278 | |
1279 | /* is userspace tring to explicitly UNSET the loginuid? */ | |
1280 | if (loginuid == AUDIT_UID_UNSET) { | |
1281 | kloginuid = INVALID_UID; | |
1282 | } else { | |
1283 | kloginuid = make_kuid(file->f_cred->user_ns, loginuid); | |
774636e1 AD |
1284 | if (!uid_valid(kloginuid)) |
1285 | return -EINVAL; | |
e1760bd5 EB |
1286 | } |
1287 | ||
774636e1 AD |
1288 | rv = audit_set_loginuid(kloginuid); |
1289 | if (rv < 0) | |
1290 | return rv; | |
1291 | return count; | |
1da177e4 LT |
1292 | } |
1293 | ||
00977a59 | 1294 | static const struct file_operations proc_loginuid_operations = { |
1da177e4 LT |
1295 | .read = proc_loginuid_read, |
1296 | .write = proc_loginuid_write, | |
87df8424 | 1297 | .llseek = generic_file_llseek, |
1da177e4 | 1298 | }; |
1e0bd755 EP |
1299 | |
1300 | static ssize_t proc_sessionid_read(struct file * file, char __user * buf, | |
1301 | size_t count, loff_t *ppos) | |
1302 | { | |
496ad9aa | 1303 | struct inode * inode = file_inode(file); |
1e0bd755 EP |
1304 | struct task_struct *task = get_proc_task(inode); |
1305 | ssize_t length; | |
1306 | char tmpbuf[TMPBUFLEN]; | |
1307 | ||
1308 | if (!task) | |
1309 | return -ESRCH; | |
1310 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", | |
1311 | audit_get_sessionid(task)); | |
1312 | put_task_struct(task); | |
1313 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
1314 | } | |
1315 | ||
1316 | static const struct file_operations proc_sessionid_operations = { | |
1317 | .read = proc_sessionid_read, | |
87df8424 | 1318 | .llseek = generic_file_llseek, |
1e0bd755 | 1319 | }; |
1da177e4 LT |
1320 | #endif |
1321 | ||
f4f154fd AM |
1322 | #ifdef CONFIG_FAULT_INJECTION |
1323 | static ssize_t proc_fault_inject_read(struct file * file, char __user * buf, | |
1324 | size_t count, loff_t *ppos) | |
1325 | { | |
496ad9aa | 1326 | struct task_struct *task = get_proc_task(file_inode(file)); |
f4f154fd AM |
1327 | char buffer[PROC_NUMBUF]; |
1328 | size_t len; | |
1329 | int make_it_fail; | |
f4f154fd AM |
1330 | |
1331 | if (!task) | |
1332 | return -ESRCH; | |
1333 | make_it_fail = task->make_it_fail; | |
1334 | put_task_struct(task); | |
1335 | ||
1336 | len = snprintf(buffer, sizeof(buffer), "%i\n", make_it_fail); | |
0c28f287 AM |
1337 | |
1338 | return simple_read_from_buffer(buf, count, ppos, buffer, len); | |
f4f154fd AM |
1339 | } |
1340 | ||
1341 | static ssize_t proc_fault_inject_write(struct file * file, | |
1342 | const char __user * buf, size_t count, loff_t *ppos) | |
1343 | { | |
1344 | struct task_struct *task; | |
774636e1 | 1345 | char buffer[PROC_NUMBUF]; |
f4f154fd | 1346 | int make_it_fail; |
774636e1 | 1347 | int rv; |
f4f154fd AM |
1348 | |
1349 | if (!capable(CAP_SYS_RESOURCE)) | |
1350 | return -EPERM; | |
1351 | memset(buffer, 0, sizeof(buffer)); | |
1352 | if (count > sizeof(buffer) - 1) | |
1353 | count = sizeof(buffer) - 1; | |
1354 | if (copy_from_user(buffer, buf, count)) | |
1355 | return -EFAULT; | |
774636e1 AD |
1356 | rv = kstrtoint(strstrip(buffer), 0, &make_it_fail); |
1357 | if (rv < 0) | |
1358 | return rv; | |
16caed31 DJ |
1359 | if (make_it_fail < 0 || make_it_fail > 1) |
1360 | return -EINVAL; | |
1361 | ||
496ad9aa | 1362 | task = get_proc_task(file_inode(file)); |
f4f154fd AM |
1363 | if (!task) |
1364 | return -ESRCH; | |
1365 | task->make_it_fail = make_it_fail; | |
1366 | put_task_struct(task); | |
cba8aafe VL |
1367 | |
1368 | return count; | |
f4f154fd AM |
1369 | } |
1370 | ||
00977a59 | 1371 | static const struct file_operations proc_fault_inject_operations = { |
f4f154fd AM |
1372 | .read = proc_fault_inject_read, |
1373 | .write = proc_fault_inject_write, | |
87df8424 | 1374 | .llseek = generic_file_llseek, |
f4f154fd | 1375 | }; |
e41d5818 DV |
1376 | |
1377 | static ssize_t proc_fail_nth_write(struct file *file, const char __user *buf, | |
1378 | size_t count, loff_t *ppos) | |
1379 | { | |
1380 | struct task_struct *task; | |
9049f2f6 AM |
1381 | int err; |
1382 | unsigned int n; | |
e41d5818 | 1383 | |
1203c8e6 AM |
1384 | err = kstrtouint_from_user(buf, count, 0, &n); |
1385 | if (err) | |
1386 | return err; | |
1387 | ||
e41d5818 DV |
1388 | task = get_proc_task(file_inode(file)); |
1389 | if (!task) | |
1390 | return -ESRCH; | |
9f7118b2 | 1391 | task->fail_nth = n; |
e41d5818 | 1392 | put_task_struct(task); |
1203c8e6 | 1393 | |
e41d5818 DV |
1394 | return count; |
1395 | } | |
1396 | ||
1397 | static ssize_t proc_fail_nth_read(struct file *file, char __user *buf, | |
1398 | size_t count, loff_t *ppos) | |
1399 | { | |
1400 | struct task_struct *task; | |
bfc74093 AM |
1401 | char numbuf[PROC_NUMBUF]; |
1402 | ssize_t len; | |
e41d5818 DV |
1403 | |
1404 | task = get_proc_task(file_inode(file)); | |
1405 | if (!task) | |
1406 | return -ESRCH; | |
9f7118b2 | 1407 | len = snprintf(numbuf, sizeof(numbuf), "%u\n", task->fail_nth); |
1203c8e6 | 1408 | put_task_struct(task); |
a44937fe | 1409 | return simple_read_from_buffer(buf, count, ppos, numbuf, len); |
e41d5818 DV |
1410 | } |
1411 | ||
1412 | static const struct file_operations proc_fail_nth_operations = { | |
1413 | .read = proc_fail_nth_read, | |
1414 | .write = proc_fail_nth_write, | |
1415 | }; | |
f4f154fd AM |
1416 | #endif |
1417 | ||
9745512c | 1418 | |
43ae34cb IM |
1419 | #ifdef CONFIG_SCHED_DEBUG |
1420 | /* | |
1421 | * Print out various scheduling related per-task fields: | |
1422 | */ | |
1423 | static int sched_show(struct seq_file *m, void *v) | |
1424 | { | |
1425 | struct inode *inode = m->private; | |
9d78edea | 1426 | struct pid_namespace *ns = proc_pid_ns(inode->i_sb); |
43ae34cb IM |
1427 | struct task_struct *p; |
1428 | ||
43ae34cb IM |
1429 | p = get_proc_task(inode); |
1430 | if (!p) | |
1431 | return -ESRCH; | |
74dc3384 | 1432 | proc_sched_show_task(p, ns, m); |
43ae34cb IM |
1433 | |
1434 | put_task_struct(p); | |
1435 | ||
1436 | return 0; | |
1437 | } | |
1438 | ||
1439 | static ssize_t | |
1440 | sched_write(struct file *file, const char __user *buf, | |
1441 | size_t count, loff_t *offset) | |
1442 | { | |
496ad9aa | 1443 | struct inode *inode = file_inode(file); |
43ae34cb IM |
1444 | struct task_struct *p; |
1445 | ||
43ae34cb IM |
1446 | p = get_proc_task(inode); |
1447 | if (!p) | |
1448 | return -ESRCH; | |
1449 | proc_sched_set_task(p); | |
1450 | ||
1451 | put_task_struct(p); | |
1452 | ||
1453 | return count; | |
1454 | } | |
1455 | ||
1456 | static int sched_open(struct inode *inode, struct file *filp) | |
1457 | { | |
c6a34058 | 1458 | return single_open(filp, sched_show, inode); |
43ae34cb IM |
1459 | } |
1460 | ||
1461 | static const struct file_operations proc_pid_sched_operations = { | |
1462 | .open = sched_open, | |
1463 | .read = seq_read, | |
1464 | .write = sched_write, | |
1465 | .llseek = seq_lseek, | |
5ea473a1 | 1466 | .release = single_release, |
43ae34cb IM |
1467 | }; |
1468 | ||
1469 | #endif | |
1470 | ||
5091faa4 MG |
1471 | #ifdef CONFIG_SCHED_AUTOGROUP |
1472 | /* | |
1473 | * Print out autogroup related information: | |
1474 | */ | |
1475 | static int sched_autogroup_show(struct seq_file *m, void *v) | |
1476 | { | |
1477 | struct inode *inode = m->private; | |
1478 | struct task_struct *p; | |
1479 | ||
1480 | p = get_proc_task(inode); | |
1481 | if (!p) | |
1482 | return -ESRCH; | |
1483 | proc_sched_autogroup_show_task(p, m); | |
1484 | ||
1485 | put_task_struct(p); | |
1486 | ||
1487 | return 0; | |
1488 | } | |
1489 | ||
1490 | static ssize_t | |
1491 | sched_autogroup_write(struct file *file, const char __user *buf, | |
1492 | size_t count, loff_t *offset) | |
1493 | { | |
496ad9aa | 1494 | struct inode *inode = file_inode(file); |
5091faa4 MG |
1495 | struct task_struct *p; |
1496 | char buffer[PROC_NUMBUF]; | |
0a8cb8e3 | 1497 | int nice; |
5091faa4 MG |
1498 | int err; |
1499 | ||
1500 | memset(buffer, 0, sizeof(buffer)); | |
1501 | if (count > sizeof(buffer) - 1) | |
1502 | count = sizeof(buffer) - 1; | |
1503 | if (copy_from_user(buffer, buf, count)) | |
1504 | return -EFAULT; | |
1505 | ||
0a8cb8e3 AD |
1506 | err = kstrtoint(strstrip(buffer), 0, &nice); |
1507 | if (err < 0) | |
1508 | return err; | |
5091faa4 MG |
1509 | |
1510 | p = get_proc_task(inode); | |
1511 | if (!p) | |
1512 | return -ESRCH; | |
1513 | ||
2e5b5b3a | 1514 | err = proc_sched_autogroup_set_nice(p, nice); |
5091faa4 MG |
1515 | if (err) |
1516 | count = err; | |
1517 | ||
1518 | put_task_struct(p); | |
1519 | ||
1520 | return count; | |
1521 | } | |
1522 | ||
1523 | static int sched_autogroup_open(struct inode *inode, struct file *filp) | |
1524 | { | |
1525 | int ret; | |
1526 | ||
1527 | ret = single_open(filp, sched_autogroup_show, NULL); | |
1528 | if (!ret) { | |
1529 | struct seq_file *m = filp->private_data; | |
1530 | ||
1531 | m->private = inode; | |
1532 | } | |
1533 | return ret; | |
1534 | } | |
1535 | ||
1536 | static const struct file_operations proc_pid_sched_autogroup_operations = { | |
1537 | .open = sched_autogroup_open, | |
1538 | .read = seq_read, | |
1539 | .write = sched_autogroup_write, | |
1540 | .llseek = seq_lseek, | |
1541 | .release = single_release, | |
1542 | }; | |
1543 | ||
1544 | #endif /* CONFIG_SCHED_AUTOGROUP */ | |
1545 | ||
04a8682a AV |
1546 | #ifdef CONFIG_TIME_NS |
1547 | static int timens_offsets_show(struct seq_file *m, void *v) | |
1548 | { | |
1549 | struct task_struct *p; | |
1550 | ||
1551 | p = get_proc_task(file_inode(m->file)); | |
1552 | if (!p) | |
1553 | return -ESRCH; | |
1554 | proc_timens_show_offsets(p, m); | |
1555 | ||
1556 | put_task_struct(p); | |
1557 | ||
1558 | return 0; | |
1559 | } | |
1560 | ||
1561 | static ssize_t timens_offsets_write(struct file *file, const char __user *buf, | |
1562 | size_t count, loff_t *ppos) | |
1563 | { | |
1564 | struct inode *inode = file_inode(file); | |
1565 | struct proc_timens_offset offsets[2]; | |
1566 | char *kbuf = NULL, *pos, *next_line; | |
1567 | struct task_struct *p; | |
1568 | int ret, noffsets; | |
1569 | ||
1570 | /* Only allow < page size writes at the beginning of the file */ | |
1571 | if ((*ppos != 0) || (count >= PAGE_SIZE)) | |
1572 | return -EINVAL; | |
1573 | ||
1574 | /* Slurp in the user data */ | |
1575 | kbuf = memdup_user_nul(buf, count); | |
1576 | if (IS_ERR(kbuf)) | |
1577 | return PTR_ERR(kbuf); | |
1578 | ||
1579 | /* Parse the user data */ | |
1580 | ret = -EINVAL; | |
1581 | noffsets = 0; | |
1582 | for (pos = kbuf; pos; pos = next_line) { | |
1583 | struct proc_timens_offset *off = &offsets[noffsets]; | |
94d440d6 | 1584 | char clock[10]; |
04a8682a AV |
1585 | int err; |
1586 | ||
1587 | /* Find the end of line and ensure we don't look past it */ | |
1588 | next_line = strchr(pos, '\n'); | |
1589 | if (next_line) { | |
1590 | *next_line = '\0'; | |
1591 | next_line++; | |
1592 | if (*next_line == '\0') | |
1593 | next_line = NULL; | |
1594 | } | |
1595 | ||
94d440d6 | 1596 | err = sscanf(pos, "%9s %lld %lu", clock, |
04a8682a AV |
1597 | &off->val.tv_sec, &off->val.tv_nsec); |
1598 | if (err != 3 || off->val.tv_nsec >= NSEC_PER_SEC) | |
1599 | goto out; | |
94d440d6 AV |
1600 | |
1601 | clock[sizeof(clock) - 1] = 0; | |
1602 | if (strcmp(clock, "monotonic") == 0 || | |
1603 | strcmp(clock, __stringify(CLOCK_MONOTONIC)) == 0) | |
1604 | off->clockid = CLOCK_MONOTONIC; | |
1605 | else if (strcmp(clock, "boottime") == 0 || | |
1606 | strcmp(clock, __stringify(CLOCK_BOOTTIME)) == 0) | |
1607 | off->clockid = CLOCK_BOOTTIME; | |
1608 | else | |
1609 | goto out; | |
1610 | ||
04a8682a AV |
1611 | noffsets++; |
1612 | if (noffsets == ARRAY_SIZE(offsets)) { | |
1613 | if (next_line) | |
1614 | count = next_line - kbuf; | |
1615 | break; | |
1616 | } | |
1617 | } | |
1618 | ||
1619 | ret = -ESRCH; | |
1620 | p = get_proc_task(inode); | |
1621 | if (!p) | |
1622 | goto out; | |
1623 | ret = proc_timens_set_offset(file, p, offsets, noffsets); | |
1624 | put_task_struct(p); | |
1625 | if (ret) | |
1626 | goto out; | |
1627 | ||
1628 | ret = count; | |
1629 | out: | |
1630 | kfree(kbuf); | |
1631 | return ret; | |
1632 | } | |
1633 | ||
1634 | static int timens_offsets_open(struct inode *inode, struct file *filp) | |
1635 | { | |
1636 | return single_open(filp, timens_offsets_show, inode); | |
1637 | } | |
1638 | ||
1639 | static const struct file_operations proc_timens_offsets_operations = { | |
1640 | .open = timens_offsets_open, | |
1641 | .read = seq_read, | |
1642 | .write = timens_offsets_write, | |
1643 | .llseek = seq_lseek, | |
1644 | .release = single_release, | |
1645 | }; | |
1646 | #endif /* CONFIG_TIME_NS */ | |
1647 | ||
4614a696 | 1648 | static ssize_t comm_write(struct file *file, const char __user *buf, |
1649 | size_t count, loff_t *offset) | |
1650 | { | |
496ad9aa | 1651 | struct inode *inode = file_inode(file); |
4614a696 | 1652 | struct task_struct *p; |
1653 | char buffer[TASK_COMM_LEN]; | |
830e0fc9 | 1654 | const size_t maxlen = sizeof(buffer) - 1; |
4614a696 | 1655 | |
1656 | memset(buffer, 0, sizeof(buffer)); | |
830e0fc9 | 1657 | if (copy_from_user(buffer, buf, count > maxlen ? maxlen : count)) |
4614a696 | 1658 | return -EFAULT; |
1659 | ||
1660 | p = get_proc_task(inode); | |
1661 | if (!p) | |
1662 | return -ESRCH; | |
1663 | ||
1664 | if (same_thread_group(current, p)) | |
1665 | set_task_comm(p, buffer); | |
1666 | else | |
1667 | count = -EINVAL; | |
1668 | ||
1669 | put_task_struct(p); | |
1670 | ||
1671 | return count; | |
1672 | } | |
1673 | ||
1674 | static int comm_show(struct seq_file *m, void *v) | |
1675 | { | |
1676 | struct inode *inode = m->private; | |
1677 | struct task_struct *p; | |
1678 | ||
1679 | p = get_proc_task(inode); | |
1680 | if (!p) | |
1681 | return -ESRCH; | |
1682 | ||
88b72b31 TH |
1683 | proc_task_name(m, p, false); |
1684 | seq_putc(m, '\n'); | |
4614a696 | 1685 | |
1686 | put_task_struct(p); | |
1687 | ||
1688 | return 0; | |
1689 | } | |
1690 | ||
1691 | static int comm_open(struct inode *inode, struct file *filp) | |
1692 | { | |
c6a34058 | 1693 | return single_open(filp, comm_show, inode); |
4614a696 | 1694 | } |
1695 | ||
1696 | static const struct file_operations proc_pid_set_comm_operations = { | |
1697 | .open = comm_open, | |
1698 | .read = seq_read, | |
1699 | .write = comm_write, | |
1700 | .llseek = seq_lseek, | |
1701 | .release = single_release, | |
1702 | }; | |
1703 | ||
7773fbc5 | 1704 | static int proc_exe_link(struct dentry *dentry, struct path *exe_path) |
925d1c40 MH |
1705 | { |
1706 | struct task_struct *task; | |
925d1c40 MH |
1707 | struct file *exe_file; |
1708 | ||
2b0143b5 | 1709 | task = get_proc_task(d_inode(dentry)); |
925d1c40 MH |
1710 | if (!task) |
1711 | return -ENOENT; | |
cd81a917 | 1712 | exe_file = get_task_exe_file(task); |
925d1c40 | 1713 | put_task_struct(task); |
925d1c40 MH |
1714 | if (exe_file) { |
1715 | *exe_path = exe_file->f_path; | |
1716 | path_get(&exe_file->f_path); | |
1717 | fput(exe_file); | |
1718 | return 0; | |
1719 | } else | |
1720 | return -ENOENT; | |
1721 | } | |
1722 | ||
6b255391 | 1723 | static const char *proc_pid_get_link(struct dentry *dentry, |
fceef393 AV |
1724 | struct inode *inode, |
1725 | struct delayed_call *done) | |
1da177e4 | 1726 | { |
408ef013 | 1727 | struct path path; |
1da177e4 LT |
1728 | int error = -EACCES; |
1729 | ||
6b255391 AV |
1730 | if (!dentry) |
1731 | return ERR_PTR(-ECHILD); | |
1732 | ||
778c1144 EB |
1733 | /* Are we allowed to snoop on the tasks file descriptors? */ |
1734 | if (!proc_fd_access_allowed(inode)) | |
1da177e4 | 1735 | goto out; |
1da177e4 | 1736 | |
408ef013 CH |
1737 | error = PROC_I(inode)->op.proc_get_link(dentry, &path); |
1738 | if (error) | |
1739 | goto out; | |
1740 | ||
1bc82070 | 1741 | error = nd_jump_link(&path); |
1da177e4 | 1742 | out: |
008b150a | 1743 | return ERR_PTR(error); |
1da177e4 LT |
1744 | } |
1745 | ||
3dcd25f3 | 1746 | static int do_proc_readlink(struct path *path, char __user *buffer, int buflen) |
1da177e4 | 1747 | { |
0ee931c4 | 1748 | char *tmp = (char *)__get_free_page(GFP_KERNEL); |
3dcd25f3 | 1749 | char *pathname; |
1da177e4 LT |
1750 | int len; |
1751 | ||
1752 | if (!tmp) | |
1753 | return -ENOMEM; | |
0c28f287 | 1754 | |
7b2a69ba | 1755 | pathname = d_path(path, tmp, PAGE_SIZE); |
3dcd25f3 JB |
1756 | len = PTR_ERR(pathname); |
1757 | if (IS_ERR(pathname)) | |
1da177e4 | 1758 | goto out; |
3dcd25f3 | 1759 | len = tmp + PAGE_SIZE - 1 - pathname; |
1da177e4 LT |
1760 | |
1761 | if (len > buflen) | |
1762 | len = buflen; | |
3dcd25f3 | 1763 | if (copy_to_user(buffer, pathname, len)) |
1da177e4 LT |
1764 | len = -EFAULT; |
1765 | out: | |
1766 | free_page((unsigned long)tmp); | |
1767 | return len; | |
1768 | } | |
1769 | ||
1770 | static int proc_pid_readlink(struct dentry * dentry, char __user * buffer, int buflen) | |
1771 | { | |
1772 | int error = -EACCES; | |
2b0143b5 | 1773 | struct inode *inode = d_inode(dentry); |
3dcd25f3 | 1774 | struct path path; |
1da177e4 | 1775 | |
778c1144 EB |
1776 | /* Are we allowed to snoop on the tasks file descriptors? */ |
1777 | if (!proc_fd_access_allowed(inode)) | |
1da177e4 | 1778 | goto out; |
1da177e4 | 1779 | |
7773fbc5 | 1780 | error = PROC_I(inode)->op.proc_get_link(dentry, &path); |
1da177e4 LT |
1781 | if (error) |
1782 | goto out; | |
1783 | ||
3dcd25f3 JB |
1784 | error = do_proc_readlink(&path, buffer, buflen); |
1785 | path_put(&path); | |
1da177e4 | 1786 | out: |
1da177e4 LT |
1787 | return error; |
1788 | } | |
1789 | ||
faf60af1 | 1790 | const struct inode_operations proc_pid_link_inode_operations = { |
1da177e4 | 1791 | .readlink = proc_pid_readlink, |
6b255391 | 1792 | .get_link = proc_pid_get_link, |
6d76fa58 | 1793 | .setattr = proc_setattr, |
1da177e4 LT |
1794 | }; |
1795 | ||
28a6d671 EB |
1796 | |
1797 | /* building an inode */ | |
1798 | ||
c6eb50d2 | 1799 | void task_dump_owner(struct task_struct *task, umode_t mode, |
68eb94f1 EB |
1800 | kuid_t *ruid, kgid_t *rgid) |
1801 | { | |
1802 | /* Depending on the state of dumpable compute who should own a | |
1803 | * proc file for a task. | |
1804 | */ | |
1805 | const struct cred *cred; | |
1806 | kuid_t uid; | |
1807 | kgid_t gid; | |
1808 | ||
2e0ad552 AD |
1809 | if (unlikely(task->flags & PF_KTHREAD)) { |
1810 | *ruid = GLOBAL_ROOT_UID; | |
1811 | *rgid = GLOBAL_ROOT_GID; | |
1812 | return; | |
1813 | } | |
1814 | ||
68eb94f1 EB |
1815 | /* Default to the tasks effective ownership */ |
1816 | rcu_read_lock(); | |
1817 | cred = __task_cred(task); | |
1818 | uid = cred->euid; | |
1819 | gid = cred->egid; | |
1820 | rcu_read_unlock(); | |
1821 | ||
1822 | /* | |
1823 | * Before the /proc/pid/status file was created the only way to read | |
1824 | * the effective uid of a /process was to stat /proc/pid. Reading | |
1825 | * /proc/pid/status is slow enough that procps and other packages | |
1826 | * kept stating /proc/pid. To keep the rules in /proc simple I have | |
1827 | * made this apply to all per process world readable and executable | |
1828 | * directories. | |
1829 | */ | |
1830 | if (mode != (S_IFDIR|S_IRUGO|S_IXUGO)) { | |
1831 | struct mm_struct *mm; | |
1832 | task_lock(task); | |
1833 | mm = task->mm; | |
1834 | /* Make non-dumpable tasks owned by some root */ | |
1835 | if (mm) { | |
1836 | if (get_dumpable(mm) != SUID_DUMP_USER) { | |
1837 | struct user_namespace *user_ns = mm->user_ns; | |
1838 | ||
1839 | uid = make_kuid(user_ns, 0); | |
1840 | if (!uid_valid(uid)) | |
1841 | uid = GLOBAL_ROOT_UID; | |
1842 | ||
1843 | gid = make_kgid(user_ns, 0); | |
1844 | if (!gid_valid(gid)) | |
1845 | gid = GLOBAL_ROOT_GID; | |
1846 | } | |
1847 | } else { | |
1848 | uid = GLOBAL_ROOT_UID; | |
1849 | gid = GLOBAL_ROOT_GID; | |
1850 | } | |
1851 | task_unlock(task); | |
1852 | } | |
1853 | *ruid = uid; | |
1854 | *rgid = gid; | |
1855 | } | |
1856 | ||
7bc3e6e5 EB |
1857 | void proc_pid_evict_inode(struct proc_inode *ei) |
1858 | { | |
1859 | struct pid *pid = ei->pid; | |
1860 | ||
1861 | if (S_ISDIR(ei->vfs_inode.i_mode)) { | |
63f818f4 | 1862 | spin_lock(&pid->lock); |
7bc3e6e5 | 1863 | hlist_del_init_rcu(&ei->sibling_inodes); |
63f818f4 | 1864 | spin_unlock(&pid->lock); |
7bc3e6e5 EB |
1865 | } |
1866 | ||
1867 | put_pid(pid); | |
1868 | } | |
1869 | ||
db978da8 AG |
1870 | struct inode *proc_pid_make_inode(struct super_block * sb, |
1871 | struct task_struct *task, umode_t mode) | |
28a6d671 EB |
1872 | { |
1873 | struct inode * inode; | |
1874 | struct proc_inode *ei; | |
7bc3e6e5 | 1875 | struct pid *pid; |
1da177e4 | 1876 | |
28a6d671 | 1877 | /* We need a new inode */ |
1da177e4 | 1878 | |
28a6d671 EB |
1879 | inode = new_inode(sb); |
1880 | if (!inode) | |
1881 | goto out; | |
1882 | ||
1883 | /* Common stuff */ | |
1884 | ei = PROC_I(inode); | |
db978da8 | 1885 | inode->i_mode = mode; |
85fe4025 | 1886 | inode->i_ino = get_next_ino(); |
078cd827 | 1887 | inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode); |
28a6d671 EB |
1888 | inode->i_op = &proc_def_inode_operations; |
1889 | ||
1890 | /* | |
1891 | * grab the reference to task. | |
1892 | */ | |
7bc3e6e5 EB |
1893 | pid = get_task_pid(task, PIDTYPE_PID); |
1894 | if (!pid) | |
28a6d671 EB |
1895 | goto out_unlock; |
1896 | ||
7bc3e6e5 EB |
1897 | /* Let the pid remember us for quick removal */ |
1898 | ei->pid = pid; | |
1899 | if (S_ISDIR(mode)) { | |
63f818f4 | 1900 | spin_lock(&pid->lock); |
7bc3e6e5 | 1901 | hlist_add_head_rcu(&ei->sibling_inodes, &pid->inodes); |
63f818f4 | 1902 | spin_unlock(&pid->lock); |
7bc3e6e5 EB |
1903 | } |
1904 | ||
68eb94f1 | 1905 | task_dump_owner(task, 0, &inode->i_uid, &inode->i_gid); |
28a6d671 EB |
1906 | security_task_to_inode(task, inode); |
1907 | ||
1da177e4 | 1908 | out: |
28a6d671 EB |
1909 | return inode; |
1910 | ||
1911 | out_unlock: | |
1912 | iput(inode); | |
1913 | return NULL; | |
1da177e4 LT |
1914 | } |
1915 | ||
a528d35e DH |
1916 | int pid_getattr(const struct path *path, struct kstat *stat, |
1917 | u32 request_mask, unsigned int query_flags) | |
1da177e4 | 1918 | { |
a528d35e | 1919 | struct inode *inode = d_inode(path->dentry); |
fa10fed3 | 1920 | struct proc_fs_info *fs_info = proc_sb_info(inode->i_sb); |
28a6d671 | 1921 | struct task_struct *task; |
c69e8d9c | 1922 | |
28a6d671 | 1923 | generic_fillattr(inode, stat); |
1da177e4 | 1924 | |
dcb0f222 EB |
1925 | stat->uid = GLOBAL_ROOT_UID; |
1926 | stat->gid = GLOBAL_ROOT_GID; | |
94116929 | 1927 | rcu_read_lock(); |
28a6d671 EB |
1928 | task = pid_task(proc_pid(inode), PIDTYPE_PID); |
1929 | if (task) { | |
fa10fed3 | 1930 | if (!has_pid_permissions(fs_info, task, HIDEPID_INVISIBLE)) { |
0499680a VK |
1931 | rcu_read_unlock(); |
1932 | /* | |
1933 | * This doesn't prevent learning whether PID exists, | |
1934 | * it only makes getattr() consistent with readdir(). | |
1935 | */ | |
1936 | return -ENOENT; | |
1937 | } | |
68eb94f1 | 1938 | task_dump_owner(task, inode->i_mode, &stat->uid, &stat->gid); |
1da177e4 | 1939 | } |
28a6d671 | 1940 | rcu_read_unlock(); |
d6e71144 | 1941 | return 0; |
1da177e4 LT |
1942 | } |
1943 | ||
1da177e4 LT |
1944 | /* dentry stuff */ |
1945 | ||
1946 | /* | |
1bbc5513 AV |
1947 | * Set <pid>/... inode ownership (can change due to setuid(), etc.) |
1948 | */ | |
1949 | void pid_update_inode(struct task_struct *task, struct inode *inode) | |
1950 | { | |
1951 | task_dump_owner(task, inode->i_mode, &inode->i_uid, &inode->i_gid); | |
1952 | ||
1953 | inode->i_mode &= ~(S_ISUID | S_ISGID); | |
1954 | security_task_to_inode(task, inode); | |
1955 | } | |
1956 | ||
1957 | /* | |
1da177e4 LT |
1958 | * Rewrite the inode's ownerships here because the owning task may have |
1959 | * performed a setuid(), etc. | |
99f89551 | 1960 | * |
1da177e4 | 1961 | */ |
1bbc5513 | 1962 | static int pid_revalidate(struct dentry *dentry, unsigned int flags) |
1da177e4 | 1963 | { |
34286d66 NP |
1964 | struct inode *inode; |
1965 | struct task_struct *task; | |
c69e8d9c | 1966 | |
0b728e19 | 1967 | if (flags & LOOKUP_RCU) |
34286d66 NP |
1968 | return -ECHILD; |
1969 | ||
2b0143b5 | 1970 | inode = d_inode(dentry); |
34286d66 NP |
1971 | task = get_proc_task(inode); |
1972 | ||
99f89551 | 1973 | if (task) { |
1bbc5513 | 1974 | pid_update_inode(task, inode); |
99f89551 | 1975 | put_task_struct(task); |
1da177e4 LT |
1976 | return 1; |
1977 | } | |
1da177e4 LT |
1978 | return 0; |
1979 | } | |
1980 | ||
d855a4b7 ON |
1981 | static inline bool proc_inode_is_dead(struct inode *inode) |
1982 | { | |
1983 | return !proc_pid(inode)->tasks[PIDTYPE_PID].first; | |
1984 | } | |
1985 | ||
1dd704b6 DH |
1986 | int pid_delete_dentry(const struct dentry *dentry) |
1987 | { | |
1988 | /* Is the task we represent dead? | |
1989 | * If so, then don't put the dentry on the lru list, | |
1990 | * kill it immediately. | |
1991 | */ | |
2b0143b5 | 1992 | return proc_inode_is_dead(d_inode(dentry)); |
1dd704b6 DH |
1993 | } |
1994 | ||
6b4e306a | 1995 | const struct dentry_operations pid_dentry_operations = |
28a6d671 EB |
1996 | { |
1997 | .d_revalidate = pid_revalidate, | |
1998 | .d_delete = pid_delete_dentry, | |
1999 | }; | |
2000 | ||
2001 | /* Lookups */ | |
2002 | ||
1c0d04c9 EB |
2003 | /* |
2004 | * Fill a directory entry. | |
2005 | * | |
2006 | * If possible create the dcache entry and derive our inode number and | |
2007 | * file type from dcache entry. | |
2008 | * | |
2009 | * Since all of the proc inode numbers are dynamically generated, the inode | |
2010 | * numbers do not exist until the inode is cache. This means creating the | |
2011 | * the dcache entry in readdir is necessary to keep the inode numbers | |
2012 | * reported by readdir in sync with the inode numbers reported | |
2013 | * by stat. | |
2014 | */ | |
f0c3b509 | 2015 | bool proc_fill_cache(struct file *file, struct dir_context *ctx, |
a4ef3895 | 2016 | const char *name, unsigned int len, |
c5141e6d | 2017 | instantiate_t instantiate, struct task_struct *task, const void *ptr) |
61a28784 | 2018 | { |
f0c3b509 | 2019 | struct dentry *child, *dir = file->f_path.dentry; |
1df98b8b | 2020 | struct qstr qname = QSTR_INIT(name, len); |
61a28784 | 2021 | struct inode *inode; |
0168b9e3 AV |
2022 | unsigned type = DT_UNKNOWN; |
2023 | ino_t ino = 1; | |
61a28784 | 2024 | |
1df98b8b | 2025 | child = d_hash_and_lookup(dir, &qname); |
61a28784 | 2026 | if (!child) { |
3781764b AV |
2027 | DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq); |
2028 | child = d_alloc_parallel(dir, &qname, &wq); | |
2029 | if (IS_ERR(child)) | |
1df98b8b | 2030 | goto end_instantiate; |
3781764b | 2031 | if (d_in_lookup(child)) { |
0168b9e3 AV |
2032 | struct dentry *res; |
2033 | res = instantiate(child, task, ptr); | |
3781764b | 2034 | d_lookup_done(child); |
0168b9e3 AV |
2035 | if (unlikely(res)) { |
2036 | dput(child); | |
2037 | child = res; | |
d85b399b AV |
2038 | if (IS_ERR(child)) |
2039 | goto end_instantiate; | |
3781764b | 2040 | } |
61a28784 EB |
2041 | } |
2042 | } | |
2b0143b5 | 2043 | inode = d_inode(child); |
147ce699 AV |
2044 | ino = inode->i_ino; |
2045 | type = inode->i_mode >> 12; | |
61a28784 | 2046 | dput(child); |
d85b399b | 2047 | end_instantiate: |
f0c3b509 | 2048 | return dir_emit(ctx, name, len, ino, type); |
61a28784 EB |
2049 | } |
2050 | ||
640708a2 PE |
2051 | /* |
2052 | * dname_to_vma_addr - maps a dentry name into two unsigned longs | |
2053 | * which represent vma start and end addresses. | |
2054 | */ | |
2055 | static int dname_to_vma_addr(struct dentry *dentry, | |
2056 | unsigned long *start, unsigned long *end) | |
2057 | { | |
ac7f1061 AD |
2058 | const char *str = dentry->d_name.name; |
2059 | unsigned long long sval, eval; | |
2060 | unsigned int len; | |
2061 | ||
35318db5 AD |
2062 | if (str[0] == '0' && str[1] != '-') |
2063 | return -EINVAL; | |
ac7f1061 AD |
2064 | len = _parse_integer(str, 16, &sval); |
2065 | if (len & KSTRTOX_OVERFLOW) | |
2066 | return -EINVAL; | |
2067 | if (sval != (unsigned long)sval) | |
2068 | return -EINVAL; | |
2069 | str += len; | |
2070 | ||
2071 | if (*str != '-') | |
640708a2 | 2072 | return -EINVAL; |
ac7f1061 AD |
2073 | str++; |
2074 | ||
35318db5 AD |
2075 | if (str[0] == '0' && str[1]) |
2076 | return -EINVAL; | |
ac7f1061 AD |
2077 | len = _parse_integer(str, 16, &eval); |
2078 | if (len & KSTRTOX_OVERFLOW) | |
2079 | return -EINVAL; | |
2080 | if (eval != (unsigned long)eval) | |
2081 | return -EINVAL; | |
2082 | str += len; | |
2083 | ||
2084 | if (*str != '\0') | |
2085 | return -EINVAL; | |
2086 | ||
2087 | *start = sval; | |
2088 | *end = eval; | |
640708a2 PE |
2089 | |
2090 | return 0; | |
2091 | } | |
2092 | ||
0b728e19 | 2093 | static int map_files_d_revalidate(struct dentry *dentry, unsigned int flags) |
640708a2 PE |
2094 | { |
2095 | unsigned long vm_start, vm_end; | |
2096 | bool exact_vma_exists = false; | |
2097 | struct mm_struct *mm = NULL; | |
2098 | struct task_struct *task; | |
640708a2 PE |
2099 | struct inode *inode; |
2100 | int status = 0; | |
2101 | ||
0b728e19 | 2102 | if (flags & LOOKUP_RCU) |
640708a2 PE |
2103 | return -ECHILD; |
2104 | ||
2b0143b5 | 2105 | inode = d_inode(dentry); |
640708a2 PE |
2106 | task = get_proc_task(inode); |
2107 | if (!task) | |
2108 | goto out_notask; | |
2109 | ||
caaee623 | 2110 | mm = mm_access(task, PTRACE_MODE_READ_FSCREDS); |
2344bec7 | 2111 | if (IS_ERR_OR_NULL(mm)) |
640708a2 PE |
2112 | goto out; |
2113 | ||
2114 | if (!dname_to_vma_addr(dentry, &vm_start, &vm_end)) { | |
d8ed45c5 | 2115 | status = mmap_read_lock_killable(mm); |
cd9e2bb8 KK |
2116 | if (!status) { |
2117 | exact_vma_exists = !!find_exact_vma(mm, vm_start, | |
2118 | vm_end); | |
d8ed45c5 | 2119 | mmap_read_unlock(mm); |
cd9e2bb8 | 2120 | } |
640708a2 PE |
2121 | } |
2122 | ||
2123 | mmput(mm); | |
2124 | ||
2125 | if (exact_vma_exists) { | |
68eb94f1 EB |
2126 | task_dump_owner(task, 0, &inode->i_uid, &inode->i_gid); |
2127 | ||
640708a2 PE |
2128 | security_task_to_inode(task, inode); |
2129 | status = 1; | |
2130 | } | |
2131 | ||
2132 | out: | |
2133 | put_task_struct(task); | |
2134 | ||
2135 | out_notask: | |
640708a2 PE |
2136 | return status; |
2137 | } | |
2138 | ||
2139 | static const struct dentry_operations tid_map_files_dentry_operations = { | |
2140 | .d_revalidate = map_files_d_revalidate, | |
2141 | .d_delete = pid_delete_dentry, | |
2142 | }; | |
2143 | ||
6b255391 | 2144 | static int map_files_get_link(struct dentry *dentry, struct path *path) |
640708a2 PE |
2145 | { |
2146 | unsigned long vm_start, vm_end; | |
2147 | struct vm_area_struct *vma; | |
2148 | struct task_struct *task; | |
2149 | struct mm_struct *mm; | |
2150 | int rc; | |
2151 | ||
2152 | rc = -ENOENT; | |
2b0143b5 | 2153 | task = get_proc_task(d_inode(dentry)); |
640708a2 PE |
2154 | if (!task) |
2155 | goto out; | |
2156 | ||
2157 | mm = get_task_mm(task); | |
2158 | put_task_struct(task); | |
2159 | if (!mm) | |
2160 | goto out; | |
2161 | ||
2162 | rc = dname_to_vma_addr(dentry, &vm_start, &vm_end); | |
2163 | if (rc) | |
2164 | goto out_mmput; | |
2165 | ||
d8ed45c5 | 2166 | rc = mmap_read_lock_killable(mm); |
cd9e2bb8 KK |
2167 | if (rc) |
2168 | goto out_mmput; | |
2169 | ||
70335abb | 2170 | rc = -ENOENT; |
640708a2 PE |
2171 | vma = find_exact_vma(mm, vm_start, vm_end); |
2172 | if (vma && vma->vm_file) { | |
2173 | *path = vma->vm_file->f_path; | |
2174 | path_get(path); | |
2175 | rc = 0; | |
2176 | } | |
d8ed45c5 | 2177 | mmap_read_unlock(mm); |
640708a2 PE |
2178 | |
2179 | out_mmput: | |
2180 | mmput(mm); | |
2181 | out: | |
2182 | return rc; | |
2183 | } | |
2184 | ||
2185 | struct map_files_info { | |
20d28cde AD |
2186 | unsigned long start; |
2187 | unsigned long end; | |
7b540d06 | 2188 | fmode_t mode; |
640708a2 PE |
2189 | }; |
2190 | ||
bdb4d100 | 2191 | /* |
12886f8a AR |
2192 | * Only allow CAP_SYS_ADMIN and CAP_CHECKPOINT_RESTORE to follow the links, due |
2193 | * to concerns about how the symlinks may be used to bypass permissions on | |
2194 | * ancestor directories in the path to the file in question. | |
bdb4d100 CO |
2195 | */ |
2196 | static const char * | |
6b255391 | 2197 | proc_map_files_get_link(struct dentry *dentry, |
fceef393 AV |
2198 | struct inode *inode, |
2199 | struct delayed_call *done) | |
bdb4d100 | 2200 | { |
12886f8a | 2201 | if (!checkpoint_restore_ns_capable(&init_user_ns)) |
bdb4d100 CO |
2202 | return ERR_PTR(-EPERM); |
2203 | ||
fceef393 | 2204 | return proc_pid_get_link(dentry, inode, done); |
bdb4d100 CO |
2205 | } |
2206 | ||
2207 | /* | |
6b255391 | 2208 | * Identical to proc_pid_link_inode_operations except for get_link() |
bdb4d100 CO |
2209 | */ |
2210 | static const struct inode_operations proc_map_files_link_inode_operations = { | |
2211 | .readlink = proc_pid_readlink, | |
6b255391 | 2212 | .get_link = proc_map_files_get_link, |
bdb4d100 CO |
2213 | .setattr = proc_setattr, |
2214 | }; | |
2215 | ||
0168b9e3 AV |
2216 | static struct dentry * |
2217 | proc_map_files_instantiate(struct dentry *dentry, | |
640708a2 PE |
2218 | struct task_struct *task, const void *ptr) |
2219 | { | |
7b540d06 | 2220 | fmode_t mode = (fmode_t)(unsigned long)ptr; |
640708a2 PE |
2221 | struct proc_inode *ei; |
2222 | struct inode *inode; | |
2223 | ||
0168b9e3 | 2224 | inode = proc_pid_make_inode(dentry->d_sb, task, S_IFLNK | |
db978da8 AG |
2225 | ((mode & FMODE_READ ) ? S_IRUSR : 0) | |
2226 | ((mode & FMODE_WRITE) ? S_IWUSR : 0)); | |
640708a2 | 2227 | if (!inode) |
0168b9e3 | 2228 | return ERR_PTR(-ENOENT); |
640708a2 PE |
2229 | |
2230 | ei = PROC_I(inode); | |
6b255391 | 2231 | ei->op.proc_get_link = map_files_get_link; |
640708a2 | 2232 | |
bdb4d100 | 2233 | inode->i_op = &proc_map_files_link_inode_operations; |
640708a2 | 2234 | inode->i_size = 64; |
640708a2 PE |
2235 | |
2236 | d_set_d_op(dentry, &tid_map_files_dentry_operations); | |
0168b9e3 | 2237 | return d_splice_alias(inode, dentry); |
640708a2 PE |
2238 | } |
2239 | ||
2240 | static struct dentry *proc_map_files_lookup(struct inode *dir, | |
00cd8dd3 | 2241 | struct dentry *dentry, unsigned int flags) |
640708a2 PE |
2242 | { |
2243 | unsigned long vm_start, vm_end; | |
2244 | struct vm_area_struct *vma; | |
2245 | struct task_struct *task; | |
0168b9e3 | 2246 | struct dentry *result; |
640708a2 PE |
2247 | struct mm_struct *mm; |
2248 | ||
0168b9e3 | 2249 | result = ERR_PTR(-ENOENT); |
640708a2 PE |
2250 | task = get_proc_task(dir); |
2251 | if (!task) | |
2252 | goto out; | |
2253 | ||
0168b9e3 | 2254 | result = ERR_PTR(-EACCES); |
caaee623 | 2255 | if (!ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS)) |
640708a2 PE |
2256 | goto out_put_task; |
2257 | ||
0168b9e3 | 2258 | result = ERR_PTR(-ENOENT); |
640708a2 | 2259 | if (dname_to_vma_addr(dentry, &vm_start, &vm_end)) |
eb94cd96 | 2260 | goto out_put_task; |
640708a2 PE |
2261 | |
2262 | mm = get_task_mm(task); | |
2263 | if (!mm) | |
eb94cd96 | 2264 | goto out_put_task; |
640708a2 | 2265 | |
cd9e2bb8 | 2266 | result = ERR_PTR(-EINTR); |
d8ed45c5 | 2267 | if (mmap_read_lock_killable(mm)) |
cd9e2bb8 KK |
2268 | goto out_put_mm; |
2269 | ||
2270 | result = ERR_PTR(-ENOENT); | |
640708a2 PE |
2271 | vma = find_exact_vma(mm, vm_start, vm_end); |
2272 | if (!vma) | |
2273 | goto out_no_vma; | |
2274 | ||
05f56484 | 2275 | if (vma->vm_file) |
0168b9e3 | 2276 | result = proc_map_files_instantiate(dentry, task, |
05f56484 | 2277 | (void *)(unsigned long)vma->vm_file->f_mode); |
640708a2 PE |
2278 | |
2279 | out_no_vma: | |
d8ed45c5 | 2280 | mmap_read_unlock(mm); |
cd9e2bb8 | 2281 | out_put_mm: |
640708a2 | 2282 | mmput(mm); |
640708a2 PE |
2283 | out_put_task: |
2284 | put_task_struct(task); | |
2285 | out: | |
0168b9e3 | 2286 | return result; |
640708a2 PE |
2287 | } |
2288 | ||
2289 | static const struct inode_operations proc_map_files_inode_operations = { | |
2290 | .lookup = proc_map_files_lookup, | |
2291 | .permission = proc_fd_permission, | |
2292 | .setattr = proc_setattr, | |
2293 | }; | |
2294 | ||
2295 | static int | |
f0c3b509 | 2296 | proc_map_files_readdir(struct file *file, struct dir_context *ctx) |
640708a2 | 2297 | { |
640708a2 PE |
2298 | struct vm_area_struct *vma; |
2299 | struct task_struct *task; | |
2300 | struct mm_struct *mm; | |
f0c3b509 | 2301 | unsigned long nr_files, pos, i; |
94f8f3b0 | 2302 | GENRADIX(struct map_files_info) fa; |
f0c3b509 | 2303 | struct map_files_info *p; |
640708a2 PE |
2304 | int ret; |
2305 | ||
94f8f3b0 KO |
2306 | genradix_init(&fa); |
2307 | ||
640708a2 | 2308 | ret = -ENOENT; |
f0c3b509 | 2309 | task = get_proc_task(file_inode(file)); |
640708a2 PE |
2310 | if (!task) |
2311 | goto out; | |
2312 | ||
2313 | ret = -EACCES; | |
caaee623 | 2314 | if (!ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS)) |
640708a2 PE |
2315 | goto out_put_task; |
2316 | ||
2317 | ret = 0; | |
f0c3b509 AV |
2318 | if (!dir_emit_dots(file, ctx)) |
2319 | goto out_put_task; | |
640708a2 | 2320 | |
f0c3b509 AV |
2321 | mm = get_task_mm(task); |
2322 | if (!mm) | |
2323 | goto out_put_task; | |
cd9e2bb8 | 2324 | |
89154dd5 | 2325 | ret = mmap_read_lock_killable(mm); |
cd9e2bb8 KK |
2326 | if (ret) { |
2327 | mmput(mm); | |
2328 | goto out_put_task; | |
2329 | } | |
640708a2 | 2330 | |
f0c3b509 | 2331 | nr_files = 0; |
640708a2 | 2332 | |
f0c3b509 AV |
2333 | /* |
2334 | * We need two passes here: | |
2335 | * | |
c1e8d7c6 ML |
2336 | * 1) Collect vmas of mapped files with mmap_lock taken |
2337 | * 2) Release mmap_lock and instantiate entries | |
f0c3b509 AV |
2338 | * |
2339 | * otherwise we get lockdep complained, since filldir() | |
c1e8d7c6 | 2340 | * routine might require mmap_lock taken in might_fault(). |
f0c3b509 | 2341 | */ |
640708a2 | 2342 | |
f0c3b509 | 2343 | for (vma = mm->mmap, pos = 2; vma; vma = vma->vm_next) { |
94f8f3b0 KO |
2344 | if (!vma->vm_file) |
2345 | continue; | |
2346 | if (++pos <= ctx->pos) | |
2347 | continue; | |
f0c3b509 | 2348 | |
94f8f3b0 KO |
2349 | p = genradix_ptr_alloc(&fa, nr_files++, GFP_KERNEL); |
2350 | if (!p) { | |
f0c3b509 | 2351 | ret = -ENOMEM; |
89154dd5 | 2352 | mmap_read_unlock(mm); |
f0c3b509 AV |
2353 | mmput(mm); |
2354 | goto out_put_task; | |
640708a2 | 2355 | } |
f0c3b509 | 2356 | |
94f8f3b0 KO |
2357 | p->start = vma->vm_start; |
2358 | p->end = vma->vm_end; | |
2359 | p->mode = vma->vm_file->f_mode; | |
640708a2 | 2360 | } |
89154dd5 | 2361 | mmap_read_unlock(mm); |
fe079a5e | 2362 | mmput(mm); |
f0c3b509 AV |
2363 | |
2364 | for (i = 0; i < nr_files; i++) { | |
20d28cde AD |
2365 | char buf[4 * sizeof(long) + 2]; /* max: %lx-%lx\0 */ |
2366 | unsigned int len; | |
2367 | ||
94f8f3b0 | 2368 | p = genradix_ptr(&fa, i); |
20d28cde | 2369 | len = snprintf(buf, sizeof(buf), "%lx-%lx", p->start, p->end); |
f0c3b509 | 2370 | if (!proc_fill_cache(file, ctx, |
20d28cde | 2371 | buf, len, |
f0c3b509 AV |
2372 | proc_map_files_instantiate, |
2373 | task, | |
2374 | (void *)(unsigned long)p->mode)) | |
2375 | break; | |
2376 | ctx->pos++; | |
640708a2 PE |
2377 | } |
2378 | ||
640708a2 PE |
2379 | out_put_task: |
2380 | put_task_struct(task); | |
2381 | out: | |
94f8f3b0 | 2382 | genradix_free(&fa); |
640708a2 PE |
2383 | return ret; |
2384 | } | |
2385 | ||
2386 | static const struct file_operations proc_map_files_operations = { | |
2387 | .read = generic_read_dir, | |
f50752ea AV |
2388 | .iterate_shared = proc_map_files_readdir, |
2389 | .llseek = generic_file_llseek, | |
640708a2 PE |
2390 | }; |
2391 | ||
b18b6a9c | 2392 | #if defined(CONFIG_CHECKPOINT_RESTORE) && defined(CONFIG_POSIX_TIMERS) |
48f6a7a5 PE |
2393 | struct timers_private { |
2394 | struct pid *pid; | |
2395 | struct task_struct *task; | |
2396 | struct sighand_struct *sighand; | |
57b8015e | 2397 | struct pid_namespace *ns; |
48f6a7a5 PE |
2398 | unsigned long flags; |
2399 | }; | |
2400 | ||
2401 | static void *timers_start(struct seq_file *m, loff_t *pos) | |
2402 | { | |
2403 | struct timers_private *tp = m->private; | |
2404 | ||
2405 | tp->task = get_pid_task(tp->pid, PIDTYPE_PID); | |
2406 | if (!tp->task) | |
2407 | return ERR_PTR(-ESRCH); | |
2408 | ||
2409 | tp->sighand = lock_task_sighand(tp->task, &tp->flags); | |
2410 | if (!tp->sighand) | |
2411 | return ERR_PTR(-ESRCH); | |
2412 | ||
2413 | return seq_list_start(&tp->task->signal->posix_timers, *pos); | |
2414 | } | |
2415 | ||
2416 | static void *timers_next(struct seq_file *m, void *v, loff_t *pos) | |
2417 | { | |
2418 | struct timers_private *tp = m->private; | |
2419 | return seq_list_next(v, &tp->task->signal->posix_timers, pos); | |
2420 | } | |
2421 | ||
2422 | static void timers_stop(struct seq_file *m, void *v) | |
2423 | { | |
2424 | struct timers_private *tp = m->private; | |
2425 | ||
2426 | if (tp->sighand) { | |
2427 | unlock_task_sighand(tp->task, &tp->flags); | |
2428 | tp->sighand = NULL; | |
2429 | } | |
2430 | ||
2431 | if (tp->task) { | |
2432 | put_task_struct(tp->task); | |
2433 | tp->task = NULL; | |
2434 | } | |
2435 | } | |
2436 | ||
2437 | static int show_timer(struct seq_file *m, void *v) | |
2438 | { | |
2439 | struct k_itimer *timer; | |
57b8015e PE |
2440 | struct timers_private *tp = m->private; |
2441 | int notify; | |
cedbccab | 2442 | static const char * const nstr[] = { |
57b8015e PE |
2443 | [SIGEV_SIGNAL] = "signal", |
2444 | [SIGEV_NONE] = "none", | |
2445 | [SIGEV_THREAD] = "thread", | |
2446 | }; | |
48f6a7a5 PE |
2447 | |
2448 | timer = list_entry((struct list_head *)v, struct k_itimer, list); | |
57b8015e PE |
2449 | notify = timer->it_sigev_notify; |
2450 | ||
48f6a7a5 | 2451 | seq_printf(m, "ID: %d\n", timer->it_id); |
ba3edf1f | 2452 | seq_printf(m, "signal: %d/%px\n", |
25ce3191 JP |
2453 | timer->sigq->info.si_signo, |
2454 | timer->sigq->info.si_value.sival_ptr); | |
57b8015e | 2455 | seq_printf(m, "notify: %s/%s.%d\n", |
25ce3191 JP |
2456 | nstr[notify & ~SIGEV_THREAD_ID], |
2457 | (notify & SIGEV_THREAD_ID) ? "tid" : "pid", | |
2458 | pid_nr_ns(timer->it_pid, tp->ns)); | |
15ef0298 | 2459 | seq_printf(m, "ClockID: %d\n", timer->it_clock); |
48f6a7a5 PE |
2460 | |
2461 | return 0; | |
2462 | } | |
2463 | ||
2464 | static const struct seq_operations proc_timers_seq_ops = { | |
2465 | .start = timers_start, | |
2466 | .next = timers_next, | |
2467 | .stop = timers_stop, | |
2468 | .show = show_timer, | |
2469 | }; | |
2470 | ||
2471 | static int proc_timers_open(struct inode *inode, struct file *file) | |
2472 | { | |
2473 | struct timers_private *tp; | |
2474 | ||
2475 | tp = __seq_open_private(file, &proc_timers_seq_ops, | |
2476 | sizeof(struct timers_private)); | |
2477 | if (!tp) | |
2478 | return -ENOMEM; | |
2479 | ||
2480 | tp->pid = proc_pid(inode); | |
9d78edea | 2481 | tp->ns = proc_pid_ns(inode->i_sb); |
48f6a7a5 PE |
2482 | return 0; |
2483 | } | |
2484 | ||
2485 | static const struct file_operations proc_timers_operations = { | |
2486 | .open = proc_timers_open, | |
2487 | .read = seq_read, | |
2488 | .llseek = seq_lseek, | |
2489 | .release = seq_release_private, | |
2490 | }; | |
b5946bea | 2491 | #endif |
640708a2 | 2492 | |
5de23d43 JS |
2493 | static ssize_t timerslack_ns_write(struct file *file, const char __user *buf, |
2494 | size_t count, loff_t *offset) | |
2495 | { | |
2496 | struct inode *inode = file_inode(file); | |
2497 | struct task_struct *p; | |
2498 | u64 slack_ns; | |
2499 | int err; | |
2500 | ||
2501 | err = kstrtoull_from_user(buf, count, 10, &slack_ns); | |
2502 | if (err < 0) | |
2503 | return err; | |
2504 | ||
2505 | p = get_proc_task(inode); | |
2506 | if (!p) | |
2507 | return -ESRCH; | |
2508 | ||
4b2bd5fe | 2509 | if (p != current) { |
8da0b4f6 BG |
2510 | rcu_read_lock(); |
2511 | if (!ns_capable(__task_cred(p)->user_ns, CAP_SYS_NICE)) { | |
2512 | rcu_read_unlock(); | |
4b2bd5fe JS |
2513 | count = -EPERM; |
2514 | goto out; | |
2515 | } | |
8da0b4f6 | 2516 | rcu_read_unlock(); |
5de23d43 | 2517 | |
4b2bd5fe JS |
2518 | err = security_task_setscheduler(p); |
2519 | if (err) { | |
2520 | count = err; | |
2521 | goto out; | |
2522 | } | |
904763e1 JS |
2523 | } |
2524 | ||
7abbaf94 JS |
2525 | task_lock(p); |
2526 | if (slack_ns == 0) | |
2527 | p->timer_slack_ns = p->default_timer_slack_ns; | |
2528 | else | |
2529 | p->timer_slack_ns = slack_ns; | |
2530 | task_unlock(p); | |
2531 | ||
2532 | out: | |
5de23d43 JS |
2533 | put_task_struct(p); |
2534 | ||
2535 | return count; | |
2536 | } | |
2537 | ||
2538 | static int timerslack_ns_show(struct seq_file *m, void *v) | |
2539 | { | |
2540 | struct inode *inode = m->private; | |
2541 | struct task_struct *p; | |
7abbaf94 | 2542 | int err = 0; |
5de23d43 JS |
2543 | |
2544 | p = get_proc_task(inode); | |
2545 | if (!p) | |
2546 | return -ESRCH; | |
2547 | ||
4b2bd5fe | 2548 | if (p != current) { |
8da0b4f6 BG |
2549 | rcu_read_lock(); |
2550 | if (!ns_capable(__task_cred(p)->user_ns, CAP_SYS_NICE)) { | |
2551 | rcu_read_unlock(); | |
4b2bd5fe JS |
2552 | err = -EPERM; |
2553 | goto out; | |
2554 | } | |
8da0b4f6 BG |
2555 | rcu_read_unlock(); |
2556 | ||
4b2bd5fe JS |
2557 | err = security_task_getscheduler(p); |
2558 | if (err) | |
2559 | goto out; | |
2560 | } | |
904763e1 | 2561 | |
7abbaf94 JS |
2562 | task_lock(p); |
2563 | seq_printf(m, "%llu\n", p->timer_slack_ns); | |
2564 | task_unlock(p); | |
2565 | ||
2566 | out: | |
5de23d43 JS |
2567 | put_task_struct(p); |
2568 | ||
2569 | return err; | |
2570 | } | |
2571 | ||
2572 | static int timerslack_ns_open(struct inode *inode, struct file *filp) | |
2573 | { | |
2574 | return single_open(filp, timerslack_ns_show, inode); | |
2575 | } | |
2576 | ||
2577 | static const struct file_operations proc_pid_set_timerslack_ns_operations = { | |
2578 | .open = timerslack_ns_open, | |
2579 | .read = seq_read, | |
2580 | .write = timerslack_ns_write, | |
2581 | .llseek = seq_lseek, | |
2582 | .release = single_release, | |
2583 | }; | |
2584 | ||
0168b9e3 AV |
2585 | static struct dentry *proc_pident_instantiate(struct dentry *dentry, |
2586 | struct task_struct *task, const void *ptr) | |
444ceed8 | 2587 | { |
c5141e6d | 2588 | const struct pid_entry *p = ptr; |
444ceed8 EB |
2589 | struct inode *inode; |
2590 | struct proc_inode *ei; | |
444ceed8 | 2591 | |
0168b9e3 | 2592 | inode = proc_pid_make_inode(dentry->d_sb, task, p->mode); |
444ceed8 | 2593 | if (!inode) |
0168b9e3 | 2594 | return ERR_PTR(-ENOENT); |
444ceed8 EB |
2595 | |
2596 | ei = PROC_I(inode); | |
444ceed8 | 2597 | if (S_ISDIR(inode->i_mode)) |
bfe86848 | 2598 | set_nlink(inode, 2); /* Use getattr to fix if necessary */ |
444ceed8 EB |
2599 | if (p->iop) |
2600 | inode->i_op = p->iop; | |
2601 | if (p->fop) | |
2602 | inode->i_fop = p->fop; | |
2603 | ei->op = p->op; | |
1bbc5513 | 2604 | pid_update_inode(task, inode); |
fb045adb | 2605 | d_set_d_op(dentry, &pid_dentry_operations); |
0168b9e3 | 2606 | return d_splice_alias(inode, dentry); |
444ceed8 EB |
2607 | } |
2608 | ||
1da177e4 LT |
2609 | static struct dentry *proc_pident_lookup(struct inode *dir, |
2610 | struct dentry *dentry, | |
d5a572a4 AD |
2611 | const struct pid_entry *p, |
2612 | const struct pid_entry *end) | |
1da177e4 | 2613 | { |
99f89551 | 2614 | struct task_struct *task = get_proc_task(dir); |
0168b9e3 | 2615 | struct dentry *res = ERR_PTR(-ENOENT); |
1da177e4 | 2616 | |
99f89551 EB |
2617 | if (!task) |
2618 | goto out_no_task; | |
1da177e4 | 2619 | |
20cdc894 EB |
2620 | /* |
2621 | * Yes, it does not scale. And it should not. Don't add | |
2622 | * new entries into /proc/<tgid>/ without very good reasons. | |
2623 | */ | |
d5a572a4 | 2624 | for (; p < end; p++) { |
1da177e4 LT |
2625 | if (p->len != dentry->d_name.len) |
2626 | continue; | |
26b95137 AD |
2627 | if (!memcmp(dentry->d_name.name, p->name, p->len)) { |
2628 | res = proc_pident_instantiate(dentry, task, p); | |
1da177e4 | 2629 | break; |
26b95137 | 2630 | } |
1da177e4 | 2631 | } |
99f89551 EB |
2632 | put_task_struct(task); |
2633 | out_no_task: | |
0168b9e3 | 2634 | return res; |
1da177e4 LT |
2635 | } |
2636 | ||
f0c3b509 | 2637 | static int proc_pident_readdir(struct file *file, struct dir_context *ctx, |
c5141e6d | 2638 | const struct pid_entry *ents, unsigned int nents) |
28a6d671 | 2639 | { |
f0c3b509 AV |
2640 | struct task_struct *task = get_proc_task(file_inode(file)); |
2641 | const struct pid_entry *p; | |
28a6d671 | 2642 | |
28a6d671 | 2643 | if (!task) |
f0c3b509 | 2644 | return -ENOENT; |
28a6d671 | 2645 | |
f0c3b509 AV |
2646 | if (!dir_emit_dots(file, ctx)) |
2647 | goto out; | |
2648 | ||
2649 | if (ctx->pos >= nents + 2) | |
2650 | goto out; | |
28a6d671 | 2651 | |
bac5f5d5 | 2652 | for (p = ents + (ctx->pos - 2); p < ents + nents; p++) { |
f0c3b509 AV |
2653 | if (!proc_fill_cache(file, ctx, p->name, p->len, |
2654 | proc_pident_instantiate, task, p)) | |
2655 | break; | |
2656 | ctx->pos++; | |
2657 | } | |
28a6d671 | 2658 | out: |
61a28784 | 2659 | put_task_struct(task); |
f0c3b509 | 2660 | return 0; |
1da177e4 LT |
2661 | } |
2662 | ||
28a6d671 EB |
2663 | #ifdef CONFIG_SECURITY |
2664 | static ssize_t proc_pid_attr_read(struct file * file, char __user * buf, | |
2665 | size_t count, loff_t *ppos) | |
2666 | { | |
496ad9aa | 2667 | struct inode * inode = file_inode(file); |
04ff9708 | 2668 | char *p = NULL; |
28a6d671 EB |
2669 | ssize_t length; |
2670 | struct task_struct *task = get_proc_task(inode); | |
2671 | ||
28a6d671 | 2672 | if (!task) |
04ff9708 | 2673 | return -ESRCH; |
28a6d671 | 2674 | |
6d9c939d | 2675 | length = security_getprocattr(task, PROC_I(inode)->op.lsm, |
2fddfeef | 2676 | (char*)file->f_path.dentry->d_name.name, |
04ff9708 | 2677 | &p); |
28a6d671 | 2678 | put_task_struct(task); |
04ff9708 AV |
2679 | if (length > 0) |
2680 | length = simple_read_from_buffer(buf, count, ppos, p, length); | |
2681 | kfree(p); | |
28a6d671 | 2682 | return length; |
1da177e4 LT |
2683 | } |
2684 | ||
28a6d671 EB |
2685 | static ssize_t proc_pid_attr_write(struct file * file, const char __user * buf, |
2686 | size_t count, loff_t *ppos) | |
2687 | { | |
496ad9aa | 2688 | struct inode * inode = file_inode(file); |
41089b6d | 2689 | struct task_struct *task; |
bb646cdb | 2690 | void *page; |
41089b6d | 2691 | int rv; |
b21507e2 | 2692 | |
41089b6d AD |
2693 | rcu_read_lock(); |
2694 | task = pid_task(proc_pid(inode), PIDTYPE_PID); | |
2695 | if (!task) { | |
2696 | rcu_read_unlock(); | |
2697 | return -ESRCH; | |
2698 | } | |
b21507e2 | 2699 | /* A task may only write its own attributes. */ |
41089b6d AD |
2700 | if (current != task) { |
2701 | rcu_read_unlock(); | |
2702 | return -EACCES; | |
2703 | } | |
35a196be PM |
2704 | /* Prevent changes to overridden credentials. */ |
2705 | if (current_cred() != current_real_cred()) { | |
2706 | rcu_read_unlock(); | |
2707 | return -EBUSY; | |
2708 | } | |
41089b6d | 2709 | rcu_read_unlock(); |
b21507e2 | 2710 | |
28a6d671 EB |
2711 | if (count > PAGE_SIZE) |
2712 | count = PAGE_SIZE; | |
2713 | ||
2714 | /* No partial writes. */ | |
28a6d671 | 2715 | if (*ppos != 0) |
41089b6d | 2716 | return -EINVAL; |
28a6d671 | 2717 | |
bb646cdb AV |
2718 | page = memdup_user(buf, count); |
2719 | if (IS_ERR(page)) { | |
41089b6d | 2720 | rv = PTR_ERR(page); |
28a6d671 | 2721 | goto out; |
bb646cdb | 2722 | } |
28a6d671 | 2723 | |
107db7c7 | 2724 | /* Guard against adverse ptrace interaction */ |
41089b6d AD |
2725 | rv = mutex_lock_interruptible(¤t->signal->cred_guard_mutex); |
2726 | if (rv < 0) | |
107db7c7 DH |
2727 | goto out_free; |
2728 | ||
6d9c939d CS |
2729 | rv = security_setprocattr(PROC_I(inode)->op.lsm, |
2730 | file->f_path.dentry->d_name.name, page, | |
2731 | count); | |
b21507e2 | 2732 | mutex_unlock(¤t->signal->cred_guard_mutex); |
28a6d671 | 2733 | out_free: |
bb646cdb | 2734 | kfree(page); |
28a6d671 | 2735 | out: |
41089b6d | 2736 | return rv; |
28a6d671 EB |
2737 | } |
2738 | ||
00977a59 | 2739 | static const struct file_operations proc_pid_attr_operations = { |
28a6d671 EB |
2740 | .read = proc_pid_attr_read, |
2741 | .write = proc_pid_attr_write, | |
87df8424 | 2742 | .llseek = generic_file_llseek, |
28a6d671 EB |
2743 | }; |
2744 | ||
6d9c939d CS |
2745 | #define LSM_DIR_OPS(LSM) \ |
2746 | static int proc_##LSM##_attr_dir_iterate(struct file *filp, \ | |
2747 | struct dir_context *ctx) \ | |
2748 | { \ | |
2749 | return proc_pident_readdir(filp, ctx, \ | |
2750 | LSM##_attr_dir_stuff, \ | |
2751 | ARRAY_SIZE(LSM##_attr_dir_stuff)); \ | |
2752 | } \ | |
2753 | \ | |
2754 | static const struct file_operations proc_##LSM##_attr_dir_ops = { \ | |
2755 | .read = generic_read_dir, \ | |
2756 | .iterate = proc_##LSM##_attr_dir_iterate, \ | |
2757 | .llseek = default_llseek, \ | |
2758 | }; \ | |
2759 | \ | |
2760 | static struct dentry *proc_##LSM##_attr_dir_lookup(struct inode *dir, \ | |
2761 | struct dentry *dentry, unsigned int flags) \ | |
2762 | { \ | |
2763 | return proc_pident_lookup(dir, dentry, \ | |
2764 | LSM##_attr_dir_stuff, \ | |
d5a572a4 | 2765 | LSM##_attr_dir_stuff + ARRAY_SIZE(LSM##_attr_dir_stuff)); \ |
6d9c939d CS |
2766 | } \ |
2767 | \ | |
2768 | static const struct inode_operations proc_##LSM##_attr_dir_inode_ops = { \ | |
2769 | .lookup = proc_##LSM##_attr_dir_lookup, \ | |
2770 | .getattr = pid_getattr, \ | |
2771 | .setattr = proc_setattr, \ | |
2772 | } | |
2773 | ||
2774 | #ifdef CONFIG_SECURITY_SMACK | |
2775 | static const struct pid_entry smack_attr_dir_stuff[] = { | |
2776 | ATTR("smack", "current", 0666), | |
2777 | }; | |
2778 | LSM_DIR_OPS(smack); | |
2779 | #endif | |
2780 | ||
6413f852 JJ |
2781 | #ifdef CONFIG_SECURITY_APPARMOR |
2782 | static const struct pid_entry apparmor_attr_dir_stuff[] = { | |
2783 | ATTR("apparmor", "current", 0666), | |
2784 | ATTR("apparmor", "prev", 0444), | |
2785 | ATTR("apparmor", "exec", 0666), | |
2786 | }; | |
2787 | LSM_DIR_OPS(apparmor); | |
2788 | #endif | |
2789 | ||
c5141e6d | 2790 | static const struct pid_entry attr_dir_stuff[] = { |
6d9c939d CS |
2791 | ATTR(NULL, "current", 0666), |
2792 | ATTR(NULL, "prev", 0444), | |
2793 | ATTR(NULL, "exec", 0666), | |
2794 | ATTR(NULL, "fscreate", 0666), | |
2795 | ATTR(NULL, "keycreate", 0666), | |
2796 | ATTR(NULL, "sockcreate", 0666), | |
2797 | #ifdef CONFIG_SECURITY_SMACK | |
2798 | DIR("smack", 0555, | |
2799 | proc_smack_attr_dir_inode_ops, proc_smack_attr_dir_ops), | |
2800 | #endif | |
6413f852 JJ |
2801 | #ifdef CONFIG_SECURITY_APPARMOR |
2802 | DIR("apparmor", 0555, | |
2803 | proc_apparmor_attr_dir_inode_ops, proc_apparmor_attr_dir_ops), | |
2804 | #endif | |
28a6d671 EB |
2805 | }; |
2806 | ||
f0c3b509 | 2807 | static int proc_attr_dir_readdir(struct file *file, struct dir_context *ctx) |
28a6d671 | 2808 | { |
f0c3b509 AV |
2809 | return proc_pident_readdir(file, ctx, |
2810 | attr_dir_stuff, ARRAY_SIZE(attr_dir_stuff)); | |
28a6d671 EB |
2811 | } |
2812 | ||
00977a59 | 2813 | static const struct file_operations proc_attr_dir_operations = { |
1da177e4 | 2814 | .read = generic_read_dir, |
f50752ea AV |
2815 | .iterate_shared = proc_attr_dir_readdir, |
2816 | .llseek = generic_file_llseek, | |
1da177e4 LT |
2817 | }; |
2818 | ||
72d9dcfc | 2819 | static struct dentry *proc_attr_dir_lookup(struct inode *dir, |
00cd8dd3 | 2820 | struct dentry *dentry, unsigned int flags) |
28a6d671 | 2821 | { |
7bcd6b0e | 2822 | return proc_pident_lookup(dir, dentry, |
d5a572a4 AD |
2823 | attr_dir_stuff, |
2824 | attr_dir_stuff + ARRAY_SIZE(attr_dir_stuff)); | |
28a6d671 EB |
2825 | } |
2826 | ||
c5ef1c42 | 2827 | static const struct inode_operations proc_attr_dir_inode_operations = { |
72d9dcfc | 2828 | .lookup = proc_attr_dir_lookup, |
99f89551 | 2829 | .getattr = pid_getattr, |
6d76fa58 | 2830 | .setattr = proc_setattr, |
1da177e4 LT |
2831 | }; |
2832 | ||
28a6d671 EB |
2833 | #endif |
2834 | ||
698ba7b5 | 2835 | #ifdef CONFIG_ELF_CORE |
3cb4a0bb KH |
2836 | static ssize_t proc_coredump_filter_read(struct file *file, char __user *buf, |
2837 | size_t count, loff_t *ppos) | |
2838 | { | |
496ad9aa | 2839 | struct task_struct *task = get_proc_task(file_inode(file)); |
3cb4a0bb KH |
2840 | struct mm_struct *mm; |
2841 | char buffer[PROC_NUMBUF]; | |
2842 | size_t len; | |
2843 | int ret; | |
2844 | ||
2845 | if (!task) | |
2846 | return -ESRCH; | |
2847 | ||
2848 | ret = 0; | |
2849 | mm = get_task_mm(task); | |
2850 | if (mm) { | |
2851 | len = snprintf(buffer, sizeof(buffer), "%08lx\n", | |
2852 | ((mm->flags & MMF_DUMP_FILTER_MASK) >> | |
2853 | MMF_DUMP_FILTER_SHIFT)); | |
2854 | mmput(mm); | |
2855 | ret = simple_read_from_buffer(buf, count, ppos, buffer, len); | |
2856 | } | |
2857 | ||
2858 | put_task_struct(task); | |
2859 | ||
2860 | return ret; | |
2861 | } | |
2862 | ||
2863 | static ssize_t proc_coredump_filter_write(struct file *file, | |
2864 | const char __user *buf, | |
2865 | size_t count, | |
2866 | loff_t *ppos) | |
2867 | { | |
2868 | struct task_struct *task; | |
2869 | struct mm_struct *mm; | |
3cb4a0bb KH |
2870 | unsigned int val; |
2871 | int ret; | |
2872 | int i; | |
2873 | unsigned long mask; | |
2874 | ||
774636e1 AD |
2875 | ret = kstrtouint_from_user(buf, count, 0, &val); |
2876 | if (ret < 0) | |
2877 | return ret; | |
3cb4a0bb KH |
2878 | |
2879 | ret = -ESRCH; | |
496ad9aa | 2880 | task = get_proc_task(file_inode(file)); |
3cb4a0bb KH |
2881 | if (!task) |
2882 | goto out_no_task; | |
2883 | ||
3cb4a0bb KH |
2884 | mm = get_task_mm(task); |
2885 | if (!mm) | |
2886 | goto out_no_mm; | |
41a0c249 | 2887 | ret = 0; |
3cb4a0bb KH |
2888 | |
2889 | for (i = 0, mask = 1; i < MMF_DUMP_FILTER_BITS; i++, mask <<= 1) { | |
2890 | if (val & mask) | |
2891 | set_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags); | |
2892 | else | |
2893 | clear_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags); | |
2894 | } | |
2895 | ||
2896 | mmput(mm); | |
2897 | out_no_mm: | |
2898 | put_task_struct(task); | |
2899 | out_no_task: | |
774636e1 AD |
2900 | if (ret < 0) |
2901 | return ret; | |
2902 | return count; | |
3cb4a0bb KH |
2903 | } |
2904 | ||
2905 | static const struct file_operations proc_coredump_filter_operations = { | |
2906 | .read = proc_coredump_filter_read, | |
2907 | .write = proc_coredump_filter_write, | |
87df8424 | 2908 | .llseek = generic_file_llseek, |
3cb4a0bb KH |
2909 | }; |
2910 | #endif | |
2911 | ||
aba76fdb | 2912 | #ifdef CONFIG_TASK_IO_ACCOUNTING |
19aadc98 | 2913 | static int do_io_accounting(struct task_struct *task, struct seq_file *m, int whole) |
297c5d92 | 2914 | { |
940389b8 | 2915 | struct task_io_accounting acct = task->ioac; |
5995477a | 2916 | unsigned long flags; |
293eb1e7 | 2917 | int result; |
5995477a | 2918 | |
76518d37 | 2919 | result = mutex_lock_killable(&task->signal->exec_update_mutex); |
293eb1e7 VK |
2920 | if (result) |
2921 | return result; | |
2922 | ||
caaee623 | 2923 | if (!ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS)) { |
293eb1e7 VK |
2924 | result = -EACCES; |
2925 | goto out_unlock; | |
2926 | } | |
1d1221f3 | 2927 | |
5995477a AR |
2928 | if (whole && lock_task_sighand(task, &flags)) { |
2929 | struct task_struct *t = task; | |
2930 | ||
2931 | task_io_accounting_add(&acct, &task->signal->ioac); | |
2932 | while_each_thread(task, t) | |
2933 | task_io_accounting_add(&acct, &t->ioac); | |
2934 | ||
2935 | unlock_task_sighand(task, &flags); | |
297c5d92 | 2936 | } |
25ce3191 JP |
2937 | seq_printf(m, |
2938 | "rchar: %llu\n" | |
2939 | "wchar: %llu\n" | |
2940 | "syscr: %llu\n" | |
2941 | "syscw: %llu\n" | |
2942 | "read_bytes: %llu\n" | |
2943 | "write_bytes: %llu\n" | |
2944 | "cancelled_write_bytes: %llu\n", | |
2945 | (unsigned long long)acct.rchar, | |
2946 | (unsigned long long)acct.wchar, | |
2947 | (unsigned long long)acct.syscr, | |
2948 | (unsigned long long)acct.syscw, | |
2949 | (unsigned long long)acct.read_bytes, | |
2950 | (unsigned long long)acct.write_bytes, | |
2951 | (unsigned long long)acct.cancelled_write_bytes); | |
2952 | result = 0; | |
2953 | ||
293eb1e7 | 2954 | out_unlock: |
76518d37 | 2955 | mutex_unlock(&task->signal->exec_update_mutex); |
293eb1e7 | 2956 | return result; |
297c5d92 AR |
2957 | } |
2958 | ||
19aadc98 AD |
2959 | static int proc_tid_io_accounting(struct seq_file *m, struct pid_namespace *ns, |
2960 | struct pid *pid, struct task_struct *task) | |
297c5d92 | 2961 | { |
19aadc98 | 2962 | return do_io_accounting(task, m, 0); |
aba76fdb | 2963 | } |
297c5d92 | 2964 | |
19aadc98 AD |
2965 | static int proc_tgid_io_accounting(struct seq_file *m, struct pid_namespace *ns, |
2966 | struct pid *pid, struct task_struct *task) | |
297c5d92 | 2967 | { |
19aadc98 | 2968 | return do_io_accounting(task, m, 1); |
297c5d92 AR |
2969 | } |
2970 | #endif /* CONFIG_TASK_IO_ACCOUNTING */ | |
aba76fdb | 2971 | |
22d917d8 EB |
2972 | #ifdef CONFIG_USER_NS |
2973 | static int proc_id_map_open(struct inode *inode, struct file *file, | |
ccf94f1b | 2974 | const struct seq_operations *seq_ops) |
22d917d8 EB |
2975 | { |
2976 | struct user_namespace *ns = NULL; | |
2977 | struct task_struct *task; | |
2978 | struct seq_file *seq; | |
2979 | int ret = -EINVAL; | |
2980 | ||
2981 | task = get_proc_task(inode); | |
2982 | if (task) { | |
2983 | rcu_read_lock(); | |
2984 | ns = get_user_ns(task_cred_xxx(task, user_ns)); | |
2985 | rcu_read_unlock(); | |
2986 | put_task_struct(task); | |
2987 | } | |
2988 | if (!ns) | |
2989 | goto err; | |
2990 | ||
2991 | ret = seq_open(file, seq_ops); | |
2992 | if (ret) | |
2993 | goto err_put_ns; | |
2994 | ||
2995 | seq = file->private_data; | |
2996 | seq->private = ns; | |
2997 | ||
2998 | return 0; | |
2999 | err_put_ns: | |
3000 | put_user_ns(ns); | |
3001 | err: | |
3002 | return ret; | |
3003 | } | |
3004 | ||
3005 | static int proc_id_map_release(struct inode *inode, struct file *file) | |
3006 | { | |
3007 | struct seq_file *seq = file->private_data; | |
3008 | struct user_namespace *ns = seq->private; | |
3009 | put_user_ns(ns); | |
3010 | return seq_release(inode, file); | |
3011 | } | |
3012 | ||
3013 | static int proc_uid_map_open(struct inode *inode, struct file *file) | |
3014 | { | |
3015 | return proc_id_map_open(inode, file, &proc_uid_seq_operations); | |
3016 | } | |
3017 | ||
3018 | static int proc_gid_map_open(struct inode *inode, struct file *file) | |
3019 | { | |
3020 | return proc_id_map_open(inode, file, &proc_gid_seq_operations); | |
3021 | } | |
3022 | ||
f76d207a EB |
3023 | static int proc_projid_map_open(struct inode *inode, struct file *file) |
3024 | { | |
3025 | return proc_id_map_open(inode, file, &proc_projid_seq_operations); | |
3026 | } | |
3027 | ||
22d917d8 EB |
3028 | static const struct file_operations proc_uid_map_operations = { |
3029 | .open = proc_uid_map_open, | |
3030 | .write = proc_uid_map_write, | |
3031 | .read = seq_read, | |
3032 | .llseek = seq_lseek, | |
3033 | .release = proc_id_map_release, | |
3034 | }; | |
3035 | ||
3036 | static const struct file_operations proc_gid_map_operations = { | |
3037 | .open = proc_gid_map_open, | |
3038 | .write = proc_gid_map_write, | |
3039 | .read = seq_read, | |
3040 | .llseek = seq_lseek, | |
3041 | .release = proc_id_map_release, | |
3042 | }; | |
f76d207a EB |
3043 | |
3044 | static const struct file_operations proc_projid_map_operations = { | |
3045 | .open = proc_projid_map_open, | |
3046 | .write = proc_projid_map_write, | |
3047 | .read = seq_read, | |
3048 | .llseek = seq_lseek, | |
3049 | .release = proc_id_map_release, | |
3050 | }; | |
9cc46516 EB |
3051 | |
3052 | static int proc_setgroups_open(struct inode *inode, struct file *file) | |
3053 | { | |
3054 | struct user_namespace *ns = NULL; | |
3055 | struct task_struct *task; | |
3056 | int ret; | |
3057 | ||
3058 | ret = -ESRCH; | |
3059 | task = get_proc_task(inode); | |
3060 | if (task) { | |
3061 | rcu_read_lock(); | |
3062 | ns = get_user_ns(task_cred_xxx(task, user_ns)); | |
3063 | rcu_read_unlock(); | |
3064 | put_task_struct(task); | |
3065 | } | |
3066 | if (!ns) | |
3067 | goto err; | |
3068 | ||
3069 | if (file->f_mode & FMODE_WRITE) { | |
3070 | ret = -EACCES; | |
3071 | if (!ns_capable(ns, CAP_SYS_ADMIN)) | |
3072 | goto err_put_ns; | |
3073 | } | |
3074 | ||
3075 | ret = single_open(file, &proc_setgroups_show, ns); | |
3076 | if (ret) | |
3077 | goto err_put_ns; | |
3078 | ||
3079 | return 0; | |
3080 | err_put_ns: | |
3081 | put_user_ns(ns); | |
3082 | err: | |
3083 | return ret; | |
3084 | } | |
3085 | ||
3086 | static int proc_setgroups_release(struct inode *inode, struct file *file) | |
3087 | { | |
3088 | struct seq_file *seq = file->private_data; | |
3089 | struct user_namespace *ns = seq->private; | |
3090 | int ret = single_release(inode, file); | |
3091 | put_user_ns(ns); | |
3092 | return ret; | |
3093 | } | |
3094 | ||
3095 | static const struct file_operations proc_setgroups_operations = { | |
3096 | .open = proc_setgroups_open, | |
3097 | .write = proc_setgroups_write, | |
3098 | .read = seq_read, | |
3099 | .llseek = seq_lseek, | |
3100 | .release = proc_setgroups_release, | |
3101 | }; | |
22d917d8 EB |
3102 | #endif /* CONFIG_USER_NS */ |
3103 | ||
47830723 KC |
3104 | static int proc_pid_personality(struct seq_file *m, struct pid_namespace *ns, |
3105 | struct pid *pid, struct task_struct *task) | |
3106 | { | |
a9712bc1 AV |
3107 | int err = lock_trace(task); |
3108 | if (!err) { | |
3109 | seq_printf(m, "%08x\n", task->personality); | |
3110 | unlock_trace(task); | |
3111 | } | |
3112 | return err; | |
47830723 KC |
3113 | } |
3114 | ||
7c23b330 JP |
3115 | #ifdef CONFIG_LIVEPATCH |
3116 | static int proc_pid_patch_state(struct seq_file *m, struct pid_namespace *ns, | |
3117 | struct pid *pid, struct task_struct *task) | |
3118 | { | |
3119 | seq_printf(m, "%d\n", task->patch_state); | |
3120 | return 0; | |
3121 | } | |
3122 | #endif /* CONFIG_LIVEPATCH */ | |
3123 | ||
c8d12627 AP |
3124 | #ifdef CONFIG_STACKLEAK_METRICS |
3125 | static int proc_stack_depth(struct seq_file *m, struct pid_namespace *ns, | |
3126 | struct pid *pid, struct task_struct *task) | |
3127 | { | |
3128 | unsigned long prev_depth = THREAD_SIZE - | |
3129 | (task->prev_lowest_stack & (THREAD_SIZE - 1)); | |
3130 | unsigned long depth = THREAD_SIZE - | |
3131 | (task->lowest_stack & (THREAD_SIZE - 1)); | |
3132 | ||
3133 | seq_printf(m, "previous stack depth: %lu\nstack depth: %lu\n", | |
3134 | prev_depth, depth); | |
3135 | return 0; | |
3136 | } | |
3137 | #endif /* CONFIG_STACKLEAK_METRICS */ | |
3138 | ||
28a6d671 EB |
3139 | /* |
3140 | * Thread groups | |
3141 | */ | |
00977a59 | 3142 | static const struct file_operations proc_task_operations; |
c5ef1c42 | 3143 | static const struct inode_operations proc_task_inode_operations; |
20cdc894 | 3144 | |
c5141e6d | 3145 | static const struct pid_entry tgid_base_stuff[] = { |
631f9c18 AD |
3146 | DIR("task", S_IRUGO|S_IXUGO, proc_task_inode_operations, proc_task_operations), |
3147 | DIR("fd", S_IRUSR|S_IXUSR, proc_fd_inode_operations, proc_fd_operations), | |
640708a2 | 3148 | DIR("map_files", S_IRUSR|S_IXUSR, proc_map_files_inode_operations, proc_map_files_operations), |
631f9c18 | 3149 | DIR("fdinfo", S_IRUSR|S_IXUSR, proc_fdinfo_inode_operations, proc_fdinfo_operations), |
6b4e306a | 3150 | DIR("ns", S_IRUSR|S_IXUGO, proc_ns_dir_inode_operations, proc_ns_dir_operations), |
b2211a36 | 3151 | #ifdef CONFIG_NET |
631f9c18 | 3152 | DIR("net", S_IRUGO|S_IXUGO, proc_net_inode_operations, proc_net_operations), |
b2211a36 | 3153 | #endif |
631f9c18 | 3154 | REG("environ", S_IRUSR, proc_environ_operations), |
c5317167 | 3155 | REG("auxv", S_IRUSR, proc_auxv_operations), |
631f9c18 | 3156 | ONE("status", S_IRUGO, proc_pid_status), |
35a35046 | 3157 | ONE("personality", S_IRUSR, proc_pid_personality), |
1c963eb1 | 3158 | ONE("limits", S_IRUGO, proc_pid_limits), |
43ae34cb | 3159 | #ifdef CONFIG_SCHED_DEBUG |
631f9c18 | 3160 | REG("sched", S_IRUGO|S_IWUSR, proc_pid_sched_operations), |
5091faa4 MG |
3161 | #endif |
3162 | #ifdef CONFIG_SCHED_AUTOGROUP | |
3163 | REG("autogroup", S_IRUGO|S_IWUSR, proc_pid_sched_autogroup_operations), | |
04a8682a AV |
3164 | #endif |
3165 | #ifdef CONFIG_TIME_NS | |
3166 | REG("timens_offsets", S_IRUGO|S_IWUSR, proc_timens_offsets_operations), | |
ebcb6734 | 3167 | #endif |
4614a696 | 3168 | REG("comm", S_IRUGO|S_IWUSR, proc_pid_set_comm_operations), |
ebcb6734 | 3169 | #ifdef CONFIG_HAVE_ARCH_TRACEHOOK |
09d93bd6 | 3170 | ONE("syscall", S_IRUSR, proc_pid_syscall), |
43ae34cb | 3171 | #endif |
c2c0bb44 | 3172 | REG("cmdline", S_IRUGO, proc_pid_cmdline_ops), |
631f9c18 AD |
3173 | ONE("stat", S_IRUGO, proc_tgid_stat), |
3174 | ONE("statm", S_IRUGO, proc_pid_statm), | |
b7643757 | 3175 | REG("maps", S_IRUGO, proc_pid_maps_operations), |
28a6d671 | 3176 | #ifdef CONFIG_NUMA |
b7643757 | 3177 | REG("numa_maps", S_IRUGO, proc_pid_numa_maps_operations), |
28a6d671 | 3178 | #endif |
631f9c18 AD |
3179 | REG("mem", S_IRUSR|S_IWUSR, proc_mem_operations), |
3180 | LNK("cwd", proc_cwd_link), | |
3181 | LNK("root", proc_root_link), | |
3182 | LNK("exe", proc_exe_link), | |
3183 | REG("mounts", S_IRUGO, proc_mounts_operations), | |
3184 | REG("mountinfo", S_IRUGO, proc_mountinfo_operations), | |
3185 | REG("mountstats", S_IRUSR, proc_mountstats_operations), | |
1e883281 | 3186 | #ifdef CONFIG_PROC_PAGE_MONITOR |
631f9c18 | 3187 | REG("clear_refs", S_IWUSR, proc_clear_refs_operations), |
b7643757 | 3188 | REG("smaps", S_IRUGO, proc_pid_smaps_operations), |
493b0e9d | 3189 | REG("smaps_rollup", S_IRUGO, proc_pid_smaps_rollup_operations), |
32ed74a4 | 3190 | REG("pagemap", S_IRUSR, proc_pagemap_operations), |
28a6d671 EB |
3191 | #endif |
3192 | #ifdef CONFIG_SECURITY | |
631f9c18 | 3193 | DIR("attr", S_IRUGO|S_IXUGO, proc_attr_dir_inode_operations, proc_attr_dir_operations), |
28a6d671 EB |
3194 | #endif |
3195 | #ifdef CONFIG_KALLSYMS | |
edfcd606 | 3196 | ONE("wchan", S_IRUGO, proc_pid_wchan), |
28a6d671 | 3197 | #endif |
2ec220e2 | 3198 | #ifdef CONFIG_STACKTRACE |
35a35046 | 3199 | ONE("stack", S_IRUSR, proc_pid_stack), |
28a6d671 | 3200 | #endif |
5968cece | 3201 | #ifdef CONFIG_SCHED_INFO |
f6e826ca | 3202 | ONE("schedstat", S_IRUGO, proc_pid_schedstat), |
28a6d671 | 3203 | #endif |
9745512c | 3204 | #ifdef CONFIG_LATENCYTOP |
631f9c18 | 3205 | REG("latency", S_IRUGO, proc_lstats_operations), |
9745512c | 3206 | #endif |
8793d854 | 3207 | #ifdef CONFIG_PROC_PID_CPUSET |
52de4779 | 3208 | ONE("cpuset", S_IRUGO, proc_cpuset_show), |
a424316c PM |
3209 | #endif |
3210 | #ifdef CONFIG_CGROUPS | |
006f4ac4 | 3211 | ONE("cgroup", S_IRUGO, proc_cgroup_show), |
e79f15a4 CY |
3212 | #endif |
3213 | #ifdef CONFIG_PROC_CPU_RESCTRL | |
3214 | ONE("cpu_resctrl_groups", S_IRUGO, proc_resctrl_show), | |
28a6d671 | 3215 | #endif |
6ba51e37 | 3216 | ONE("oom_score", S_IRUGO, proc_oom_score), |
fa0cbbf1 | 3217 | REG("oom_adj", S_IRUGO|S_IWUSR, proc_oom_adj_operations), |
a63d83f4 | 3218 | REG("oom_score_adj", S_IRUGO|S_IWUSR, proc_oom_score_adj_operations), |
4b7d248b | 3219 | #ifdef CONFIG_AUDIT |
631f9c18 AD |
3220 | REG("loginuid", S_IWUSR|S_IRUGO, proc_loginuid_operations), |
3221 | REG("sessionid", S_IRUGO, proc_sessionid_operations), | |
28a6d671 | 3222 | #endif |
f4f154fd | 3223 | #ifdef CONFIG_FAULT_INJECTION |
631f9c18 | 3224 | REG("make-it-fail", S_IRUGO|S_IWUSR, proc_fault_inject_operations), |
168c42bc | 3225 | REG("fail-nth", 0644, proc_fail_nth_operations), |
f4f154fd | 3226 | #endif |
698ba7b5 | 3227 | #ifdef CONFIG_ELF_CORE |
631f9c18 | 3228 | REG("coredump_filter", S_IRUGO|S_IWUSR, proc_coredump_filter_operations), |
3cb4a0bb | 3229 | #endif |
aba76fdb | 3230 | #ifdef CONFIG_TASK_IO_ACCOUNTING |
19aadc98 | 3231 | ONE("io", S_IRUSR, proc_tgid_io_accounting), |
aba76fdb | 3232 | #endif |
22d917d8 EB |
3233 | #ifdef CONFIG_USER_NS |
3234 | REG("uid_map", S_IRUGO|S_IWUSR, proc_uid_map_operations), | |
3235 | REG("gid_map", S_IRUGO|S_IWUSR, proc_gid_map_operations), | |
f76d207a | 3236 | REG("projid_map", S_IRUGO|S_IWUSR, proc_projid_map_operations), |
9cc46516 | 3237 | REG("setgroups", S_IRUGO|S_IWUSR, proc_setgroups_operations), |
22d917d8 | 3238 | #endif |
b18b6a9c | 3239 | #if defined(CONFIG_CHECKPOINT_RESTORE) && defined(CONFIG_POSIX_TIMERS) |
48f6a7a5 PE |
3240 | REG("timers", S_IRUGO, proc_timers_operations), |
3241 | #endif | |
5de23d43 | 3242 | REG("timerslack_ns", S_IRUGO|S_IWUGO, proc_pid_set_timerslack_ns_operations), |
7c23b330 JP |
3243 | #ifdef CONFIG_LIVEPATCH |
3244 | ONE("patch_state", S_IRUSR, proc_pid_patch_state), | |
3245 | #endif | |
c8d12627 AP |
3246 | #ifdef CONFIG_STACKLEAK_METRICS |
3247 | ONE("stack_depth", S_IRUGO, proc_stack_depth), | |
3248 | #endif | |
68bc30bb AL |
3249 | #ifdef CONFIG_PROC_PID_ARCH_STATUS |
3250 | ONE("arch_status", S_IRUGO, proc_pid_arch_status), | |
3251 | #endif | |
28a6d671 | 3252 | }; |
1da177e4 | 3253 | |
f0c3b509 | 3254 | static int proc_tgid_base_readdir(struct file *file, struct dir_context *ctx) |
1da177e4 | 3255 | { |
f0c3b509 AV |
3256 | return proc_pident_readdir(file, ctx, |
3257 | tgid_base_stuff, ARRAY_SIZE(tgid_base_stuff)); | |
1da177e4 LT |
3258 | } |
3259 | ||
00977a59 | 3260 | static const struct file_operations proc_tgid_base_operations = { |
1da177e4 | 3261 | .read = generic_read_dir, |
f50752ea AV |
3262 | .iterate_shared = proc_tgid_base_readdir, |
3263 | .llseek = generic_file_llseek, | |
1da177e4 LT |
3264 | }; |
3265 | ||
3eb39f47 CB |
3266 | struct pid *tgid_pidfd_to_pid(const struct file *file) |
3267 | { | |
30d158b1 | 3268 | if (file->f_op != &proc_tgid_base_operations) |
3eb39f47 CB |
3269 | return ERR_PTR(-EBADF); |
3270 | ||
3271 | return proc_pid(file_inode(file)); | |
3272 | } | |
3273 | ||
00cd8dd3 AV |
3274 | static struct dentry *proc_tgid_base_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags) |
3275 | { | |
7bcd6b0e | 3276 | return proc_pident_lookup(dir, dentry, |
d5a572a4 AD |
3277 | tgid_base_stuff, |
3278 | tgid_base_stuff + ARRAY_SIZE(tgid_base_stuff)); | |
1da177e4 LT |
3279 | } |
3280 | ||
c5ef1c42 | 3281 | static const struct inode_operations proc_tgid_base_inode_operations = { |
28a6d671 | 3282 | .lookup = proc_tgid_base_lookup, |
99f89551 | 3283 | .getattr = pid_getattr, |
6d76fa58 | 3284 | .setattr = proc_setattr, |
0499680a | 3285 | .permission = proc_pid_permission, |
1da177e4 | 3286 | }; |
1da177e4 | 3287 | |
0895e91d | 3288 | /** |
7bc3e6e5 EB |
3289 | * proc_flush_pid - Remove dcache entries for @pid from the /proc dcache. |
3290 | * @pid: pid that should be flushed. | |
0895e91d | 3291 | * |
7bc3e6e5 EB |
3292 | * This function walks a list of inodes (that belong to any proc |
3293 | * filesystem) that are attached to the pid and flushes them from | |
3294 | * the dentry cache. | |
0895e91d RD |
3295 | * |
3296 | * It is safe and reasonable to cache /proc entries for a task until | |
3297 | * that task exits. After that they just clog up the dcache with | |
3298 | * useless entries, possibly causing useful dcache entries to be | |
7bc3e6e5 EB |
3299 | * flushed instead. This routine is provided to flush those useless |
3300 | * dcache entries when a process is reaped. | |
0895e91d RD |
3301 | * |
3302 | * NOTE: This routine is just an optimization so it does not guarantee | |
7bc3e6e5 EB |
3303 | * that no dcache entries will exist after a process is reaped |
3304 | * it just makes it very unlikely that any will persist. | |
60347f67 PE |
3305 | */ |
3306 | ||
7bc3e6e5 | 3307 | void proc_flush_pid(struct pid *pid) |
60347f67 | 3308 | { |
63f818f4 | 3309 | proc_invalidate_siblings_dcache(&pid->inodes, &pid->lock); |
60347f67 PE |
3310 | } |
3311 | ||
0168b9e3 | 3312 | static struct dentry *proc_pid_instantiate(struct dentry * dentry, |
c52a47ac | 3313 | struct task_struct *task, const void *ptr) |
444ceed8 | 3314 | { |
444ceed8 EB |
3315 | struct inode *inode; |
3316 | ||
0168b9e3 | 3317 | inode = proc_pid_make_inode(dentry->d_sb, task, S_IFDIR | S_IRUGO | S_IXUGO); |
444ceed8 | 3318 | if (!inode) |
0168b9e3 | 3319 | return ERR_PTR(-ENOENT); |
444ceed8 | 3320 | |
444ceed8 EB |
3321 | inode->i_op = &proc_tgid_base_inode_operations; |
3322 | inode->i_fop = &proc_tgid_base_operations; | |
3323 | inode->i_flags|=S_IMMUTABLE; | |
aed54175 | 3324 | |
1270dd8d | 3325 | set_nlink(inode, nlink_tgid); |
1bbc5513 | 3326 | pid_update_inode(task, inode); |
444ceed8 | 3327 | |
fb045adb | 3328 | d_set_d_op(dentry, &pid_dentry_operations); |
0168b9e3 | 3329 | return d_splice_alias(inode, dentry); |
444ceed8 EB |
3330 | } |
3331 | ||
867aaccf | 3332 | struct dentry *proc_pid_lookup(struct dentry *dentry, unsigned int flags) |
1da177e4 LT |
3333 | { |
3334 | struct task_struct *task; | |
1da177e4 | 3335 | unsigned tgid; |
fa10fed3 | 3336 | struct proc_fs_info *fs_info; |
b488893a | 3337 | struct pid_namespace *ns; |
0168b9e3 | 3338 | struct dentry *result = ERR_PTR(-ENOENT); |
1da177e4 | 3339 | |
dbcdb504 | 3340 | tgid = name_to_int(&dentry->d_name); |
1da177e4 LT |
3341 | if (tgid == ~0U) |
3342 | goto out; | |
3343 | ||
fa10fed3 AG |
3344 | fs_info = proc_sb_info(dentry->d_sb); |
3345 | ns = fs_info->pid_ns; | |
de758734 | 3346 | rcu_read_lock(); |
b488893a | 3347 | task = find_task_by_pid_ns(tgid, ns); |
1da177e4 LT |
3348 | if (task) |
3349 | get_task_struct(task); | |
de758734 | 3350 | rcu_read_unlock(); |
1da177e4 LT |
3351 | if (!task) |
3352 | goto out; | |
3353 | ||
24a71ce5 AG |
3354 | /* Limit procfs to only ptraceable tasks */ |
3355 | if (fs_info->hide_pid == HIDEPID_NOT_PTRACEABLE) { | |
3356 | if (!has_pid_permissions(fs_info, task, HIDEPID_NO_ACCESS)) | |
3357 | goto out_put_task; | |
3358 | } | |
3359 | ||
0168b9e3 | 3360 | result = proc_pid_instantiate(dentry, task, NULL); |
24a71ce5 | 3361 | out_put_task: |
1da177e4 | 3362 | put_task_struct(task); |
1da177e4 | 3363 | out: |
0168b9e3 | 3364 | return result; |
1da177e4 LT |
3365 | } |
3366 | ||
1da177e4 | 3367 | /* |
0804ef4b | 3368 | * Find the first task with tgid >= tgid |
0bc58a91 | 3369 | * |
1da177e4 | 3370 | */ |
19fd4bb2 EB |
3371 | struct tgid_iter { |
3372 | unsigned int tgid; | |
0804ef4b | 3373 | struct task_struct *task; |
19fd4bb2 EB |
3374 | }; |
3375 | static struct tgid_iter next_tgid(struct pid_namespace *ns, struct tgid_iter iter) | |
3376 | { | |
0804ef4b | 3377 | struct pid *pid; |
1da177e4 | 3378 | |
19fd4bb2 EB |
3379 | if (iter.task) |
3380 | put_task_struct(iter.task); | |
454cc105 | 3381 | rcu_read_lock(); |
0804ef4b | 3382 | retry: |
19fd4bb2 EB |
3383 | iter.task = NULL; |
3384 | pid = find_ge_pid(iter.tgid, ns); | |
0804ef4b | 3385 | if (pid) { |
19fd4bb2 | 3386 | iter.tgid = pid_nr_ns(pid, ns); |
3147d8aa EB |
3387 | iter.task = pid_task(pid, PIDTYPE_TGID); |
3388 | if (!iter.task) { | |
19fd4bb2 | 3389 | iter.tgid += 1; |
0804ef4b | 3390 | goto retry; |
19fd4bb2 EB |
3391 | } |
3392 | get_task_struct(iter.task); | |
0bc58a91 | 3393 | } |
454cc105 | 3394 | rcu_read_unlock(); |
19fd4bb2 | 3395 | return iter; |
1da177e4 LT |
3396 | } |
3397 | ||
0097875b | 3398 | #define TGID_OFFSET (FIRST_PROCESS_ENTRY + 2) |
0804ef4b | 3399 | |
1da177e4 | 3400 | /* for the /proc/ directory itself, after non-process stuff has been done */ |
f0c3b509 | 3401 | int proc_pid_readdir(struct file *file, struct dir_context *ctx) |
1da177e4 | 3402 | { |
19fd4bb2 | 3403 | struct tgid_iter iter; |
fa10fed3 | 3404 | struct proc_fs_info *fs_info = proc_sb_info(file_inode(file)->i_sb); |
9d78edea | 3405 | struct pid_namespace *ns = proc_pid_ns(file_inode(file)->i_sb); |
f0c3b509 | 3406 | loff_t pos = ctx->pos; |
1da177e4 | 3407 | |
021ada7d | 3408 | if (pos >= PID_MAX_LIMIT + TGID_OFFSET) |
f0c3b509 | 3409 | return 0; |
1da177e4 | 3410 | |
0097875b | 3411 | if (pos == TGID_OFFSET - 2) { |
fa10fed3 | 3412 | struct inode *inode = d_inode(fs_info->proc_self); |
db963164 | 3413 | if (!dir_emit(ctx, "self", 4, inode->i_ino, DT_LNK)) |
f0c3b509 | 3414 | return 0; |
0097875b EB |
3415 | ctx->pos = pos = pos + 1; |
3416 | } | |
3417 | if (pos == TGID_OFFSET - 1) { | |
fa10fed3 | 3418 | struct inode *inode = d_inode(fs_info->proc_thread_self); |
0097875b EB |
3419 | if (!dir_emit(ctx, "thread-self", 11, inode->i_ino, DT_LNK)) |
3420 | return 0; | |
3421 | ctx->pos = pos = pos + 1; | |
021ada7d | 3422 | } |
0097875b | 3423 | iter.tgid = pos - TGID_OFFSET; |
19fd4bb2 | 3424 | iter.task = NULL; |
19fd4bb2 EB |
3425 | for (iter = next_tgid(ns, iter); |
3426 | iter.task; | |
3427 | iter.tgid += 1, iter = next_tgid(ns, iter)) { | |
e3912ac3 | 3428 | char name[10 + 1]; |
a4ef3895 | 3429 | unsigned int len; |
3ba4bcee ED |
3430 | |
3431 | cond_resched(); | |
fa10fed3 | 3432 | if (!has_pid_permissions(fs_info, iter.task, HIDEPID_INVISIBLE)) |
f0c3b509 | 3433 | continue; |
0499680a | 3434 | |
e3912ac3 | 3435 | len = snprintf(name, sizeof(name), "%u", iter.tgid); |
f0c3b509 AV |
3436 | ctx->pos = iter.tgid + TGID_OFFSET; |
3437 | if (!proc_fill_cache(file, ctx, name, len, | |
3438 | proc_pid_instantiate, iter.task, NULL)) { | |
19fd4bb2 | 3439 | put_task_struct(iter.task); |
f0c3b509 | 3440 | return 0; |
1da177e4 | 3441 | } |
0bc58a91 | 3442 | } |
f0c3b509 | 3443 | ctx->pos = PID_MAX_LIMIT + TGID_OFFSET; |
0bc58a91 EB |
3444 | return 0; |
3445 | } | |
1da177e4 | 3446 | |
1b3044e3 JD |
3447 | /* |
3448 | * proc_tid_comm_permission is a special permission function exclusively | |
3449 | * used for the node /proc/<pid>/task/<tid>/comm. | |
3450 | * It bypasses generic permission checks in the case where a task of the same | |
3451 | * task group attempts to access the node. | |
3452 | * The rationale behind this is that glibc and bionic access this node for | |
3453 | * cross thread naming (pthread_set/getname_np(!self)). However, if | |
3454 | * PR_SET_DUMPABLE gets set to 0 this node among others becomes uid=0 gid=0, | |
3455 | * which locks out the cross thread naming implementation. | |
3456 | * This function makes sure that the node is always accessible for members of | |
3457 | * same thread group. | |
3458 | */ | |
3459 | static int proc_tid_comm_permission(struct inode *inode, int mask) | |
3460 | { | |
3461 | bool is_same_tgroup; | |
3462 | struct task_struct *task; | |
3463 | ||
3464 | task = get_proc_task(inode); | |
3465 | if (!task) | |
3466 | return -ESRCH; | |
3467 | is_same_tgroup = same_thread_group(current, task); | |
3468 | put_task_struct(task); | |
3469 | ||
3470 | if (likely(is_same_tgroup && !(mask & MAY_EXEC))) { | |
3471 | /* This file (/proc/<pid>/task/<tid>/comm) can always be | |
3472 | * read or written by the members of the corresponding | |
3473 | * thread group. | |
3474 | */ | |
3475 | return 0; | |
3476 | } | |
3477 | ||
3478 | return generic_permission(inode, mask); | |
3479 | } | |
3480 | ||
3481 | static const struct inode_operations proc_tid_comm_inode_operations = { | |
3482 | .permission = proc_tid_comm_permission, | |
3483 | }; | |
3484 | ||
28a6d671 EB |
3485 | /* |
3486 | * Tasks | |
3487 | */ | |
c5141e6d | 3488 | static const struct pid_entry tid_base_stuff[] = { |
631f9c18 | 3489 | DIR("fd", S_IRUSR|S_IXUSR, proc_fd_inode_operations, proc_fd_operations), |
3835541d | 3490 | DIR("fdinfo", S_IRUSR|S_IXUSR, proc_fdinfo_inode_operations, proc_fdinfo_operations), |
6b4e306a | 3491 | DIR("ns", S_IRUSR|S_IXUGO, proc_ns_dir_inode_operations, proc_ns_dir_operations), |
6ba8ed79 EB |
3492 | #ifdef CONFIG_NET |
3493 | DIR("net", S_IRUGO|S_IXUGO, proc_net_inode_operations, proc_net_operations), | |
3494 | #endif | |
631f9c18 | 3495 | REG("environ", S_IRUSR, proc_environ_operations), |
c5317167 | 3496 | REG("auxv", S_IRUSR, proc_auxv_operations), |
631f9c18 | 3497 | ONE("status", S_IRUGO, proc_pid_status), |
35a35046 | 3498 | ONE("personality", S_IRUSR, proc_pid_personality), |
1c963eb1 | 3499 | ONE("limits", S_IRUGO, proc_pid_limits), |
43ae34cb | 3500 | #ifdef CONFIG_SCHED_DEBUG |
631f9c18 | 3501 | REG("sched", S_IRUGO|S_IWUSR, proc_pid_sched_operations), |
ebcb6734 | 3502 | #endif |
1b3044e3 JD |
3503 | NOD("comm", S_IFREG|S_IRUGO|S_IWUSR, |
3504 | &proc_tid_comm_inode_operations, | |
3505 | &proc_pid_set_comm_operations, {}), | |
ebcb6734 | 3506 | #ifdef CONFIG_HAVE_ARCH_TRACEHOOK |
09d93bd6 | 3507 | ONE("syscall", S_IRUSR, proc_pid_syscall), |
43ae34cb | 3508 | #endif |
c2c0bb44 | 3509 | REG("cmdline", S_IRUGO, proc_pid_cmdline_ops), |
631f9c18 AD |
3510 | ONE("stat", S_IRUGO, proc_tid_stat), |
3511 | ONE("statm", S_IRUGO, proc_pid_statm), | |
871305bb | 3512 | REG("maps", S_IRUGO, proc_pid_maps_operations), |
2e13ba54 | 3513 | #ifdef CONFIG_PROC_CHILDREN |
81841161 CG |
3514 | REG("children", S_IRUGO, proc_tid_children_operations), |
3515 | #endif | |
28a6d671 | 3516 | #ifdef CONFIG_NUMA |
871305bb | 3517 | REG("numa_maps", S_IRUGO, proc_pid_numa_maps_operations), |
28a6d671 | 3518 | #endif |
631f9c18 AD |
3519 | REG("mem", S_IRUSR|S_IWUSR, proc_mem_operations), |
3520 | LNK("cwd", proc_cwd_link), | |
3521 | LNK("root", proc_root_link), | |
3522 | LNK("exe", proc_exe_link), | |
3523 | REG("mounts", S_IRUGO, proc_mounts_operations), | |
3524 | REG("mountinfo", S_IRUGO, proc_mountinfo_operations), | |
1e883281 | 3525 | #ifdef CONFIG_PROC_PAGE_MONITOR |
631f9c18 | 3526 | REG("clear_refs", S_IWUSR, proc_clear_refs_operations), |
871305bb | 3527 | REG("smaps", S_IRUGO, proc_pid_smaps_operations), |
493b0e9d | 3528 | REG("smaps_rollup", S_IRUGO, proc_pid_smaps_rollup_operations), |
32ed74a4 | 3529 | REG("pagemap", S_IRUSR, proc_pagemap_operations), |
28a6d671 EB |
3530 | #endif |
3531 | #ifdef CONFIG_SECURITY | |
631f9c18 | 3532 | DIR("attr", S_IRUGO|S_IXUGO, proc_attr_dir_inode_operations, proc_attr_dir_operations), |
28a6d671 EB |
3533 | #endif |
3534 | #ifdef CONFIG_KALLSYMS | |
edfcd606 | 3535 | ONE("wchan", S_IRUGO, proc_pid_wchan), |
28a6d671 | 3536 | #endif |
2ec220e2 | 3537 | #ifdef CONFIG_STACKTRACE |
35a35046 | 3538 | ONE("stack", S_IRUSR, proc_pid_stack), |
28a6d671 | 3539 | #endif |
5968cece | 3540 | #ifdef CONFIG_SCHED_INFO |
f6e826ca | 3541 | ONE("schedstat", S_IRUGO, proc_pid_schedstat), |
28a6d671 | 3542 | #endif |
9745512c | 3543 | #ifdef CONFIG_LATENCYTOP |
631f9c18 | 3544 | REG("latency", S_IRUGO, proc_lstats_operations), |
9745512c | 3545 | #endif |
8793d854 | 3546 | #ifdef CONFIG_PROC_PID_CPUSET |
52de4779 | 3547 | ONE("cpuset", S_IRUGO, proc_cpuset_show), |
a424316c PM |
3548 | #endif |
3549 | #ifdef CONFIG_CGROUPS | |
006f4ac4 | 3550 | ONE("cgroup", S_IRUGO, proc_cgroup_show), |
e79f15a4 CY |
3551 | #endif |
3552 | #ifdef CONFIG_PROC_CPU_RESCTRL | |
3553 | ONE("cpu_resctrl_groups", S_IRUGO, proc_resctrl_show), | |
28a6d671 | 3554 | #endif |
6ba51e37 | 3555 | ONE("oom_score", S_IRUGO, proc_oom_score), |
fa0cbbf1 | 3556 | REG("oom_adj", S_IRUGO|S_IWUSR, proc_oom_adj_operations), |
a63d83f4 | 3557 | REG("oom_score_adj", S_IRUGO|S_IWUSR, proc_oom_score_adj_operations), |
4b7d248b | 3558 | #ifdef CONFIG_AUDIT |
631f9c18 | 3559 | REG("loginuid", S_IWUSR|S_IRUGO, proc_loginuid_operations), |
26ec3c64 | 3560 | REG("sessionid", S_IRUGO, proc_sessionid_operations), |
28a6d671 | 3561 | #endif |
f4f154fd | 3562 | #ifdef CONFIG_FAULT_INJECTION |
631f9c18 | 3563 | REG("make-it-fail", S_IRUGO|S_IWUSR, proc_fault_inject_operations), |
1203c8e6 | 3564 | REG("fail-nth", 0644, proc_fail_nth_operations), |
f4f154fd | 3565 | #endif |
297c5d92 | 3566 | #ifdef CONFIG_TASK_IO_ACCOUNTING |
19aadc98 | 3567 | ONE("io", S_IRUSR, proc_tid_io_accounting), |
297c5d92 | 3568 | #endif |
22d917d8 EB |
3569 | #ifdef CONFIG_USER_NS |
3570 | REG("uid_map", S_IRUGO|S_IWUSR, proc_uid_map_operations), | |
3571 | REG("gid_map", S_IRUGO|S_IWUSR, proc_gid_map_operations), | |
f76d207a | 3572 | REG("projid_map", S_IRUGO|S_IWUSR, proc_projid_map_operations), |
9cc46516 | 3573 | REG("setgroups", S_IRUGO|S_IWUSR, proc_setgroups_operations), |
22d917d8 | 3574 | #endif |
7c23b330 JP |
3575 | #ifdef CONFIG_LIVEPATCH |
3576 | ONE("patch_state", S_IRUSR, proc_pid_patch_state), | |
3577 | #endif | |
68bc30bb AL |
3578 | #ifdef CONFIG_PROC_PID_ARCH_STATUS |
3579 | ONE("arch_status", S_IRUGO, proc_pid_arch_status), | |
3580 | #endif | |
28a6d671 EB |
3581 | }; |
3582 | ||
f0c3b509 | 3583 | static int proc_tid_base_readdir(struct file *file, struct dir_context *ctx) |
28a6d671 | 3584 | { |
f0c3b509 AV |
3585 | return proc_pident_readdir(file, ctx, |
3586 | tid_base_stuff, ARRAY_SIZE(tid_base_stuff)); | |
28a6d671 EB |
3587 | } |
3588 | ||
00cd8dd3 AV |
3589 | static struct dentry *proc_tid_base_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags) |
3590 | { | |
7bcd6b0e | 3591 | return proc_pident_lookup(dir, dentry, |
d5a572a4 AD |
3592 | tid_base_stuff, |
3593 | tid_base_stuff + ARRAY_SIZE(tid_base_stuff)); | |
28a6d671 EB |
3594 | } |
3595 | ||
00977a59 | 3596 | static const struct file_operations proc_tid_base_operations = { |
28a6d671 | 3597 | .read = generic_read_dir, |
f50752ea AV |
3598 | .iterate_shared = proc_tid_base_readdir, |
3599 | .llseek = generic_file_llseek, | |
28a6d671 EB |
3600 | }; |
3601 | ||
c5ef1c42 | 3602 | static const struct inode_operations proc_tid_base_inode_operations = { |
28a6d671 EB |
3603 | .lookup = proc_tid_base_lookup, |
3604 | .getattr = pid_getattr, | |
3605 | .setattr = proc_setattr, | |
3606 | }; | |
3607 | ||
0168b9e3 AV |
3608 | static struct dentry *proc_task_instantiate(struct dentry *dentry, |
3609 | struct task_struct *task, const void *ptr) | |
444ceed8 | 3610 | { |
444ceed8 | 3611 | struct inode *inode; |
0168b9e3 | 3612 | inode = proc_pid_make_inode(dentry->d_sb, task, S_IFDIR | S_IRUGO | S_IXUGO); |
444ceed8 | 3613 | if (!inode) |
0168b9e3 | 3614 | return ERR_PTR(-ENOENT); |
1bbc5513 | 3615 | |
444ceed8 EB |
3616 | inode->i_op = &proc_tid_base_inode_operations; |
3617 | inode->i_fop = &proc_tid_base_operations; | |
1bbc5513 | 3618 | inode->i_flags |= S_IMMUTABLE; |
aed54175 | 3619 | |
1270dd8d | 3620 | set_nlink(inode, nlink_tid); |
1bbc5513 | 3621 | pid_update_inode(task, inode); |
444ceed8 | 3622 | |
fb045adb | 3623 | d_set_d_op(dentry, &pid_dentry_operations); |
0168b9e3 | 3624 | return d_splice_alias(inode, dentry); |
444ceed8 EB |
3625 | } |
3626 | ||
00cd8dd3 | 3627 | static struct dentry *proc_task_lookup(struct inode *dir, struct dentry * dentry, unsigned int flags) |
28a6d671 | 3628 | { |
28a6d671 EB |
3629 | struct task_struct *task; |
3630 | struct task_struct *leader = get_proc_task(dir); | |
28a6d671 | 3631 | unsigned tid; |
fa10fed3 | 3632 | struct proc_fs_info *fs_info; |
b488893a | 3633 | struct pid_namespace *ns; |
0168b9e3 | 3634 | struct dentry *result = ERR_PTR(-ENOENT); |
28a6d671 EB |
3635 | |
3636 | if (!leader) | |
3637 | goto out_no_task; | |
3638 | ||
dbcdb504 | 3639 | tid = name_to_int(&dentry->d_name); |
28a6d671 EB |
3640 | if (tid == ~0U) |
3641 | goto out; | |
3642 | ||
fa10fed3 AG |
3643 | fs_info = proc_sb_info(dentry->d_sb); |
3644 | ns = fs_info->pid_ns; | |
28a6d671 | 3645 | rcu_read_lock(); |
b488893a | 3646 | task = find_task_by_pid_ns(tid, ns); |
28a6d671 EB |
3647 | if (task) |
3648 | get_task_struct(task); | |
3649 | rcu_read_unlock(); | |
3650 | if (!task) | |
3651 | goto out; | |
bac0abd6 | 3652 | if (!same_thread_group(leader, task)) |
28a6d671 EB |
3653 | goto out_drop_task; |
3654 | ||
0168b9e3 | 3655 | result = proc_task_instantiate(dentry, task, NULL); |
28a6d671 EB |
3656 | out_drop_task: |
3657 | put_task_struct(task); | |
3658 | out: | |
3659 | put_task_struct(leader); | |
3660 | out_no_task: | |
0168b9e3 | 3661 | return result; |
28a6d671 EB |
3662 | } |
3663 | ||
0bc58a91 EB |
3664 | /* |
3665 | * Find the first tid of a thread group to return to user space. | |
3666 | * | |
3667 | * Usually this is just the thread group leader, but if the users | |
3668 | * buffer was too small or there was a seek into the middle of the | |
3669 | * directory we have more work todo. | |
3670 | * | |
3671 | * In the case of a short read we start with find_task_by_pid. | |
3672 | * | |
3673 | * In the case of a seek we start with the leader and walk nr | |
3674 | * threads past it. | |
3675 | */ | |
9f6e963f ON |
3676 | static struct task_struct *first_tid(struct pid *pid, int tid, loff_t f_pos, |
3677 | struct pid_namespace *ns) | |
0bc58a91 | 3678 | { |
d855a4b7 | 3679 | struct task_struct *pos, *task; |
9f6e963f ON |
3680 | unsigned long nr = f_pos; |
3681 | ||
3682 | if (nr != f_pos) /* 32bit overflow? */ | |
3683 | return NULL; | |
1da177e4 | 3684 | |
cc288738 | 3685 | rcu_read_lock(); |
d855a4b7 ON |
3686 | task = pid_task(pid, PIDTYPE_PID); |
3687 | if (!task) | |
3688 | goto fail; | |
3689 | ||
3690 | /* Attempt to start with the tid of a thread */ | |
9f6e963f | 3691 | if (tid && nr) { |
b488893a | 3692 | pos = find_task_by_pid_ns(tid, ns); |
d855a4b7 | 3693 | if (pos && same_thread_group(pos, task)) |
a872ff0c | 3694 | goto found; |
0bc58a91 | 3695 | } |
1da177e4 | 3696 | |
0bc58a91 | 3697 | /* If nr exceeds the number of threads there is nothing todo */ |
9f6e963f | 3698 | if (nr >= get_nr_threads(task)) |
c986c14a | 3699 | goto fail; |
1da177e4 | 3700 | |
a872ff0c ON |
3701 | /* If we haven't found our starting place yet start |
3702 | * with the leader and walk nr threads forward. | |
0bc58a91 | 3703 | */ |
d855a4b7 | 3704 | pos = task = task->group_leader; |
c986c14a | 3705 | do { |
9f6e963f | 3706 | if (!nr--) |
c986c14a | 3707 | goto found; |
d855a4b7 | 3708 | } while_each_thread(task, pos); |
c986c14a ON |
3709 | fail: |
3710 | pos = NULL; | |
3711 | goto out; | |
a872ff0c ON |
3712 | found: |
3713 | get_task_struct(pos); | |
3714 | out: | |
cc288738 | 3715 | rcu_read_unlock(); |
0bc58a91 EB |
3716 | return pos; |
3717 | } | |
3718 | ||
3719 | /* | |
3720 | * Find the next thread in the thread list. | |
3721 | * Return NULL if there is an error or no next thread. | |
3722 | * | |
3723 | * The reference to the input task_struct is released. | |
3724 | */ | |
3725 | static struct task_struct *next_tid(struct task_struct *start) | |
3726 | { | |
c1df7fb8 | 3727 | struct task_struct *pos = NULL; |
cc288738 | 3728 | rcu_read_lock(); |
c1df7fb8 | 3729 | if (pid_alive(start)) { |
0bc58a91 | 3730 | pos = next_thread(start); |
c1df7fb8 ON |
3731 | if (thread_group_leader(pos)) |
3732 | pos = NULL; | |
3733 | else | |
3734 | get_task_struct(pos); | |
3735 | } | |
cc288738 | 3736 | rcu_read_unlock(); |
0bc58a91 EB |
3737 | put_task_struct(start); |
3738 | return pos; | |
1da177e4 LT |
3739 | } |
3740 | ||
3741 | /* for the /proc/TGID/task/ directories */ | |
f0c3b509 | 3742 | static int proc_task_readdir(struct file *file, struct dir_context *ctx) |
1da177e4 | 3743 | { |
d855a4b7 ON |
3744 | struct inode *inode = file_inode(file); |
3745 | struct task_struct *task; | |
b488893a | 3746 | struct pid_namespace *ns; |
f0c3b509 | 3747 | int tid; |
1da177e4 | 3748 | |
d855a4b7 | 3749 | if (proc_inode_is_dead(inode)) |
f0c3b509 | 3750 | return -ENOENT; |
1da177e4 | 3751 | |
f0c3b509 | 3752 | if (!dir_emit_dots(file, ctx)) |
d855a4b7 | 3753 | return 0; |
1da177e4 | 3754 | |
0bc58a91 EB |
3755 | /* f_version caches the tgid value that the last readdir call couldn't |
3756 | * return. lseek aka telldir automagically resets f_version to 0. | |
3757 | */ | |
9d78edea | 3758 | ns = proc_pid_ns(inode->i_sb); |
f0c3b509 AV |
3759 | tid = (int)file->f_version; |
3760 | file->f_version = 0; | |
d855a4b7 | 3761 | for (task = first_tid(proc_pid(inode), tid, ctx->pos - 2, ns); |
0bc58a91 | 3762 | task; |
f0c3b509 | 3763 | task = next_tid(task), ctx->pos++) { |
e3912ac3 | 3764 | char name[10 + 1]; |
a4ef3895 | 3765 | unsigned int len; |
b488893a | 3766 | tid = task_pid_nr_ns(task, ns); |
e3912ac3 | 3767 | len = snprintf(name, sizeof(name), "%u", tid); |
f0c3b509 AV |
3768 | if (!proc_fill_cache(file, ctx, name, len, |
3769 | proc_task_instantiate, task, NULL)) { | |
0bc58a91 EB |
3770 | /* returning this tgid failed, save it as the first |
3771 | * pid for the next readir call */ | |
f0c3b509 | 3772 | file->f_version = (u64)tid; |
0bc58a91 | 3773 | put_task_struct(task); |
1da177e4 | 3774 | break; |
0bc58a91 | 3775 | } |
1da177e4 | 3776 | } |
d855a4b7 | 3777 | |
f0c3b509 | 3778 | return 0; |
1da177e4 | 3779 | } |
6e66b52b | 3780 | |
a528d35e DH |
3781 | static int proc_task_getattr(const struct path *path, struct kstat *stat, |
3782 | u32 request_mask, unsigned int query_flags) | |
6e66b52b | 3783 | { |
a528d35e | 3784 | struct inode *inode = d_inode(path->dentry); |
99f89551 | 3785 | struct task_struct *p = get_proc_task(inode); |
6e66b52b EB |
3786 | generic_fillattr(inode, stat); |
3787 | ||
99f89551 | 3788 | if (p) { |
99f89551 | 3789 | stat->nlink += get_nr_threads(p); |
99f89551 | 3790 | put_task_struct(p); |
6e66b52b EB |
3791 | } |
3792 | ||
3793 | return 0; | |
3794 | } | |
28a6d671 | 3795 | |
c5ef1c42 | 3796 | static const struct inode_operations proc_task_inode_operations = { |
28a6d671 EB |
3797 | .lookup = proc_task_lookup, |
3798 | .getattr = proc_task_getattr, | |
3799 | .setattr = proc_setattr, | |
0499680a | 3800 | .permission = proc_pid_permission, |
28a6d671 EB |
3801 | }; |
3802 | ||
00977a59 | 3803 | static const struct file_operations proc_task_operations = { |
28a6d671 | 3804 | .read = generic_read_dir, |
f50752ea AV |
3805 | .iterate_shared = proc_task_readdir, |
3806 | .llseek = generic_file_llseek, | |
28a6d671 | 3807 | }; |
1270dd8d AD |
3808 | |
3809 | void __init set_proc_pid_nlink(void) | |
3810 | { | |
3811 | nlink_tid = pid_entry_nlink(tid_base_stuff, ARRAY_SIZE(tid_base_stuff)); | |
3812 | nlink_tgid = pid_entry_nlink(tgid_base_stuff, ARRAY_SIZE(tgid_base_stuff)); | |
3813 | } |