Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/fs/proc/base.c | |
3 | * | |
4 | * Copyright (C) 1991, 1992 Linus Torvalds | |
5 | * | |
6 | * proc base directory handling functions | |
7 | * | |
8 | * 1999, Al Viro. Rewritten. Now it covers the whole per-process part. | |
9 | * Instead of using magical inumbers to determine the kind of object | |
10 | * we allocate and fill in-core inodes upon lookup. They don't even | |
11 | * go into icache. We cache the reference to task_struct upon lookup too. | |
12 | * Eventually it should become a filesystem in its own. We don't use the | |
13 | * rest of procfs anymore. | |
e070ad49 ML |
14 | * |
15 | * | |
16 | * Changelog: | |
17 | * 17-Jan-2005 | |
18 | * Allan Bezerra | |
19 | * Bruna Moreira <bruna.moreira@indt.org.br> | |
20 | * Edjard Mota <edjard.mota@indt.org.br> | |
21 | * Ilias Biris <ilias.biris@indt.org.br> | |
22 | * Mauricio Lin <mauricio.lin@indt.org.br> | |
23 | * | |
24 | * Embedded Linux Lab - 10LE Instituto Nokia de Tecnologia - INdT | |
25 | * | |
26 | * A new process specific entry (smaps) included in /proc. It shows the | |
27 | * size of rss for each memory area. The maps entry lacks information | |
28 | * about physical memory size (rss) for each mapped file, i.e., | |
29 | * rss information for executables and library files. | |
30 | * This additional information is useful for any tools that need to know | |
31 | * about physical memory consumption for a process specific library. | |
32 | * | |
33 | * Changelog: | |
34 | * 21-Feb-2005 | |
35 | * Embedded Linux Lab - 10LE Instituto Nokia de Tecnologia - INdT | |
36 | * Pud inclusion in the page table walking. | |
37 | * | |
38 | * ChangeLog: | |
39 | * 10-Mar-2005 | |
40 | * 10LE Instituto Nokia de Tecnologia - INdT: | |
41 | * A better way to walks through the page table as suggested by Hugh Dickins. | |
42 | * | |
43 | * Simo Piiroinen <simo.piiroinen@nokia.com>: | |
44 | * Smaps information related to shared, private, clean and dirty pages. | |
45 | * | |
46 | * Paul Mundt <paul.mundt@nokia.com>: | |
47 | * Overall revision about smaps. | |
1da177e4 LT |
48 | */ |
49 | ||
50 | #include <asm/uaccess.h> | |
51 | ||
1da177e4 LT |
52 | #include <linux/errno.h> |
53 | #include <linux/time.h> | |
54 | #include <linux/proc_fs.h> | |
55 | #include <linux/stat.h> | |
5995477a | 56 | #include <linux/task_io_accounting_ops.h> |
1da177e4 | 57 | #include <linux/init.h> |
16f7e0fe | 58 | #include <linux/capability.h> |
1da177e4 | 59 | #include <linux/file.h> |
9f3acc31 | 60 | #include <linux/fdtable.h> |
1da177e4 LT |
61 | #include <linux/string.h> |
62 | #include <linux/seq_file.h> | |
63 | #include <linux/namei.h> | |
6b3286ed | 64 | #include <linux/mnt_namespace.h> |
1da177e4 | 65 | #include <linux/mm.h> |
a63d83f4 | 66 | #include <linux/swap.h> |
b835996f | 67 | #include <linux/rcupdate.h> |
1da177e4 | 68 | #include <linux/kallsyms.h> |
2ec220e2 | 69 | #include <linux/stacktrace.h> |
d85f50d5 | 70 | #include <linux/resource.h> |
5096add8 | 71 | #include <linux/module.h> |
1da177e4 LT |
72 | #include <linux/mount.h> |
73 | #include <linux/security.h> | |
74 | #include <linux/ptrace.h> | |
0d094efe | 75 | #include <linux/tracehook.h> |
87ebdc00 | 76 | #include <linux/printk.h> |
a424316c | 77 | #include <linux/cgroup.h> |
1da177e4 LT |
78 | #include <linux/cpuset.h> |
79 | #include <linux/audit.h> | |
5addc5dd | 80 | #include <linux/poll.h> |
1651e14e | 81 | #include <linux/nsproxy.h> |
8ac773b4 | 82 | #include <linux/oom.h> |
3cb4a0bb | 83 | #include <linux/elf.h> |
60347f67 | 84 | #include <linux/pid_namespace.h> |
22d917d8 | 85 | #include <linux/user_namespace.h> |
5ad4e53b | 86 | #include <linux/fs_struct.h> |
5a0e3ad6 | 87 | #include <linux/slab.h> |
640708a2 | 88 | #include <linux/flex_array.h> |
48f6a7a5 | 89 | #include <linux/posix-timers.h> |
f133ecca CM |
90 | #ifdef CONFIG_HARDWALL |
91 | #include <asm/hardwall.h> | |
92 | #endif | |
43d2b113 | 93 | #include <trace/events/oom.h> |
1da177e4 | 94 | #include "internal.h" |
faf60af1 | 95 | #include "fd.h" |
1da177e4 | 96 | |
0f2fe20f EB |
97 | /* NOTE: |
98 | * Implementing inode permission operations in /proc is almost | |
99 | * certainly an error. Permission checks need to happen during | |
100 | * each system call not at open time. The reason is that most of | |
101 | * what we wish to check for permissions in /proc varies at runtime. | |
102 | * | |
103 | * The classic example of a problem is opening file descriptors | |
104 | * in /proc for a task before it execs a suid executable. | |
105 | */ | |
106 | ||
1da177e4 | 107 | struct pid_entry { |
cedbccab | 108 | const char *name; |
c5141e6d | 109 | int len; |
d161a13f | 110 | umode_t mode; |
c5ef1c42 | 111 | const struct inode_operations *iop; |
00977a59 | 112 | const struct file_operations *fop; |
20cdc894 | 113 | union proc_op op; |
1da177e4 LT |
114 | }; |
115 | ||
61a28784 | 116 | #define NOD(NAME, MODE, IOP, FOP, OP) { \ |
20cdc894 | 117 | .name = (NAME), \ |
c5141e6d | 118 | .len = sizeof(NAME) - 1, \ |
20cdc894 EB |
119 | .mode = MODE, \ |
120 | .iop = IOP, \ | |
121 | .fop = FOP, \ | |
122 | .op = OP, \ | |
123 | } | |
124 | ||
631f9c18 AD |
125 | #define DIR(NAME, MODE, iops, fops) \ |
126 | NOD(NAME, (S_IFDIR|(MODE)), &iops, &fops, {} ) | |
127 | #define LNK(NAME, get_link) \ | |
61a28784 | 128 | NOD(NAME, (S_IFLNK|S_IRWXUGO), \ |
20cdc894 | 129 | &proc_pid_link_inode_operations, NULL, \ |
631f9c18 AD |
130 | { .proc_get_link = get_link } ) |
131 | #define REG(NAME, MODE, fops) \ | |
132 | NOD(NAME, (S_IFREG|(MODE)), NULL, &fops, {}) | |
133 | #define INF(NAME, MODE, read) \ | |
61a28784 | 134 | NOD(NAME, (S_IFREG|(MODE)), \ |
20cdc894 | 135 | NULL, &proc_info_file_operations, \ |
631f9c18 AD |
136 | { .proc_read = read } ) |
137 | #define ONE(NAME, MODE, show) \ | |
be614086 EB |
138 | NOD(NAME, (S_IFREG|(MODE)), \ |
139 | NULL, &proc_single_file_operations, \ | |
631f9c18 | 140 | { .proc_show = show } ) |
1da177e4 | 141 | |
aed54175 VN |
142 | /* |
143 | * Count the number of hardlinks for the pid_entry table, excluding the . | |
144 | * and .. links. | |
145 | */ | |
146 | static unsigned int pid_entry_count_dirs(const struct pid_entry *entries, | |
147 | unsigned int n) | |
148 | { | |
149 | unsigned int i; | |
150 | unsigned int count; | |
151 | ||
152 | count = 0; | |
153 | for (i = 0; i < n; ++i) { | |
154 | if (S_ISDIR(entries[i].mode)) | |
155 | ++count; | |
156 | } | |
157 | ||
158 | return count; | |
159 | } | |
160 | ||
f7ad3c6b | 161 | static int get_task_root(struct task_struct *task, struct path *root) |
1da177e4 | 162 | { |
7c2c7d99 HD |
163 | int result = -ENOENT; |
164 | ||
0494f6ec | 165 | task_lock(task); |
f7ad3c6b MS |
166 | if (task->fs) { |
167 | get_fs_root(task->fs, root); | |
7c2c7d99 HD |
168 | result = 0; |
169 | } | |
0494f6ec | 170 | task_unlock(task); |
7c2c7d99 | 171 | return result; |
0494f6ec MS |
172 | } |
173 | ||
7773fbc5 | 174 | static int proc_cwd_link(struct dentry *dentry, struct path *path) |
0494f6ec | 175 | { |
7773fbc5 | 176 | struct task_struct *task = get_proc_task(dentry->d_inode); |
0494f6ec | 177 | int result = -ENOENT; |
99f89551 EB |
178 | |
179 | if (task) { | |
f7ad3c6b MS |
180 | task_lock(task); |
181 | if (task->fs) { | |
182 | get_fs_pwd(task->fs, path); | |
183 | result = 0; | |
184 | } | |
185 | task_unlock(task); | |
99f89551 EB |
186 | put_task_struct(task); |
187 | } | |
1da177e4 LT |
188 | return result; |
189 | } | |
190 | ||
7773fbc5 | 191 | static int proc_root_link(struct dentry *dentry, struct path *path) |
1da177e4 | 192 | { |
7773fbc5 | 193 | struct task_struct *task = get_proc_task(dentry->d_inode); |
1da177e4 | 194 | int result = -ENOENT; |
99f89551 EB |
195 | |
196 | if (task) { | |
f7ad3c6b | 197 | result = get_task_root(task, path); |
99f89551 EB |
198 | put_task_struct(task); |
199 | } | |
1da177e4 LT |
200 | return result; |
201 | } | |
202 | ||
21a6457a | 203 | static int proc_pid_cmdline(struct task_struct *task, char *buffer) |
1da177e4 | 204 | { |
21a6457a | 205 | return get_cmdline(task, buffer, PAGE_SIZE); |
1da177e4 LT |
206 | } |
207 | ||
f9ea536e AD |
208 | static int proc_pid_auxv(struct seq_file *m, struct pid_namespace *ns, |
209 | struct pid *pid, struct task_struct *task) | |
1da177e4 | 210 | { |
e7dcd999 | 211 | struct mm_struct *mm = mm_access(task, PTRACE_MODE_READ); |
2fadaef4 | 212 | if (mm && !IS_ERR(mm)) { |
1da177e4 | 213 | unsigned int nwords = 0; |
dfe6b7d9 | 214 | do { |
1da177e4 | 215 | nwords += 2; |
dfe6b7d9 | 216 | } while (mm->saved_auxv[nwords - 2] != 0); /* AT_NULL */ |
f9ea536e | 217 | seq_write(m, mm->saved_auxv, nwords * sizeof(mm->saved_auxv[0])); |
1da177e4 | 218 | mmput(mm); |
f9ea536e AD |
219 | return 0; |
220 | } else | |
221 | return PTR_ERR(mm); | |
1da177e4 LT |
222 | } |
223 | ||
224 | ||
225 | #ifdef CONFIG_KALLSYMS | |
226 | /* | |
227 | * Provides a wchan file via kallsyms in a proper one-value-per-file format. | |
228 | * Returns the resolved symbol. If that fails, simply return the address. | |
229 | */ | |
230 | static int proc_pid_wchan(struct task_struct *task, char *buffer) | |
231 | { | |
ffb45122 | 232 | unsigned long wchan; |
9281acea | 233 | char symname[KSYM_NAME_LEN]; |
1da177e4 LT |
234 | |
235 | wchan = get_wchan(task); | |
236 | ||
9d65cb4a | 237 | if (lookup_symbol_name(wchan, symname) < 0) |
f83ce3e6 JE |
238 | if (!ptrace_may_access(task, PTRACE_MODE_READ)) |
239 | return 0; | |
240 | else | |
241 | return sprintf(buffer, "%lu", wchan); | |
9d65cb4a AD |
242 | else |
243 | return sprintf(buffer, "%s", symname); | |
1da177e4 LT |
244 | } |
245 | #endif /* CONFIG_KALLSYMS */ | |
246 | ||
a9712bc1 AV |
247 | static int lock_trace(struct task_struct *task) |
248 | { | |
249 | int err = mutex_lock_killable(&task->signal->cred_guard_mutex); | |
250 | if (err) | |
251 | return err; | |
252 | if (!ptrace_may_access(task, PTRACE_MODE_ATTACH)) { | |
253 | mutex_unlock(&task->signal->cred_guard_mutex); | |
254 | return -EPERM; | |
255 | } | |
256 | return 0; | |
257 | } | |
258 | ||
259 | static void unlock_trace(struct task_struct *task) | |
260 | { | |
261 | mutex_unlock(&task->signal->cred_guard_mutex); | |
262 | } | |
263 | ||
2ec220e2 KC |
264 | #ifdef CONFIG_STACKTRACE |
265 | ||
266 | #define MAX_STACK_TRACE_DEPTH 64 | |
267 | ||
268 | static int proc_pid_stack(struct seq_file *m, struct pid_namespace *ns, | |
269 | struct pid *pid, struct task_struct *task) | |
270 | { | |
271 | struct stack_trace trace; | |
272 | unsigned long *entries; | |
a9712bc1 | 273 | int err; |
2ec220e2 KC |
274 | int i; |
275 | ||
276 | entries = kmalloc(MAX_STACK_TRACE_DEPTH * sizeof(*entries), GFP_KERNEL); | |
277 | if (!entries) | |
278 | return -ENOMEM; | |
279 | ||
280 | trace.nr_entries = 0; | |
281 | trace.max_entries = MAX_STACK_TRACE_DEPTH; | |
282 | trace.entries = entries; | |
283 | trace.skip = 0; | |
2ec220e2 | 284 | |
a9712bc1 AV |
285 | err = lock_trace(task); |
286 | if (!err) { | |
287 | save_stack_trace_tsk(task, &trace); | |
288 | ||
289 | for (i = 0; i < trace.nr_entries; i++) { | |
b81a618d | 290 | seq_printf(m, "[<%pK>] %pS\n", |
a9712bc1 AV |
291 | (void *)entries[i], (void *)entries[i]); |
292 | } | |
293 | unlock_trace(task); | |
2ec220e2 KC |
294 | } |
295 | kfree(entries); | |
296 | ||
a9712bc1 | 297 | return err; |
2ec220e2 KC |
298 | } |
299 | #endif | |
300 | ||
1da177e4 LT |
301 | #ifdef CONFIG_SCHEDSTATS |
302 | /* | |
303 | * Provides /proc/PID/schedstat | |
304 | */ | |
305 | static int proc_pid_schedstat(struct task_struct *task, char *buffer) | |
306 | { | |
172ba844 | 307 | return sprintf(buffer, "%llu %llu %lu\n", |
826e08b0 IM |
308 | (unsigned long long)task->se.sum_exec_runtime, |
309 | (unsigned long long)task->sched_info.run_delay, | |
2d72376b | 310 | task->sched_info.pcount); |
1da177e4 LT |
311 | } |
312 | #endif | |
313 | ||
9745512c AV |
314 | #ifdef CONFIG_LATENCYTOP |
315 | static int lstats_show_proc(struct seq_file *m, void *v) | |
316 | { | |
317 | int i; | |
13d77c37 HS |
318 | struct inode *inode = m->private; |
319 | struct task_struct *task = get_proc_task(inode); | |
9745512c | 320 | |
13d77c37 HS |
321 | if (!task) |
322 | return -ESRCH; | |
323 | seq_puts(m, "Latency Top version : v0.1\n"); | |
9745512c | 324 | for (i = 0; i < 32; i++) { |
34e49d4f JP |
325 | struct latency_record *lr = &task->latency_record[i]; |
326 | if (lr->backtrace[0]) { | |
9745512c | 327 | int q; |
34e49d4f JP |
328 | seq_printf(m, "%i %li %li", |
329 | lr->count, lr->time, lr->max); | |
9745512c | 330 | for (q = 0; q < LT_BACKTRACEDEPTH; q++) { |
34e49d4f JP |
331 | unsigned long bt = lr->backtrace[q]; |
332 | if (!bt) | |
9745512c | 333 | break; |
34e49d4f | 334 | if (bt == ULONG_MAX) |
9745512c | 335 | break; |
34e49d4f | 336 | seq_printf(m, " %ps", (void *)bt); |
9745512c | 337 | } |
9d6de12f | 338 | seq_putc(m, '\n'); |
9745512c AV |
339 | } |
340 | ||
341 | } | |
13d77c37 | 342 | put_task_struct(task); |
9745512c AV |
343 | return 0; |
344 | } | |
345 | ||
346 | static int lstats_open(struct inode *inode, struct file *file) | |
347 | { | |
13d77c37 | 348 | return single_open(file, lstats_show_proc, inode); |
d6643d12 HS |
349 | } |
350 | ||
9745512c AV |
351 | static ssize_t lstats_write(struct file *file, const char __user *buf, |
352 | size_t count, loff_t *offs) | |
353 | { | |
496ad9aa | 354 | struct task_struct *task = get_proc_task(file_inode(file)); |
9745512c | 355 | |
13d77c37 HS |
356 | if (!task) |
357 | return -ESRCH; | |
9745512c | 358 | clear_all_latency_tracing(task); |
13d77c37 | 359 | put_task_struct(task); |
9745512c AV |
360 | |
361 | return count; | |
362 | } | |
363 | ||
364 | static const struct file_operations proc_lstats_operations = { | |
365 | .open = lstats_open, | |
366 | .read = seq_read, | |
367 | .write = lstats_write, | |
368 | .llseek = seq_lseek, | |
13d77c37 | 369 | .release = single_release, |
9745512c AV |
370 | }; |
371 | ||
372 | #endif | |
373 | ||
8d8b97ba AV |
374 | #ifdef CONFIG_CGROUPS |
375 | static int cgroup_open(struct inode *inode, struct file *file) | |
376 | { | |
377 | struct pid *pid = PROC_I(inode)->pid; | |
378 | return single_open(file, proc_cgroup_show, pid); | |
379 | } | |
380 | ||
381 | static const struct file_operations proc_cgroup_operations = { | |
382 | .open = cgroup_open, | |
383 | .read = seq_read, | |
384 | .llseek = seq_lseek, | |
385 | .release = single_release, | |
386 | }; | |
387 | #endif | |
388 | ||
389 | #ifdef CONFIG_PROC_PID_CPUSET | |
390 | ||
391 | static int cpuset_open(struct inode *inode, struct file *file) | |
392 | { | |
393 | struct pid *pid = PROC_I(inode)->pid; | |
394 | return single_open(file, proc_cpuset_show, pid); | |
395 | } | |
396 | ||
397 | static const struct file_operations proc_cpuset_operations = { | |
398 | .open = cpuset_open, | |
399 | .read = seq_read, | |
400 | .llseek = seq_lseek, | |
401 | .release = single_release, | |
402 | }; | |
403 | #endif | |
404 | ||
1da177e4 LT |
405 | static int proc_oom_score(struct task_struct *task, char *buffer) |
406 | { | |
a7f638f9 | 407 | unsigned long totalpages = totalram_pages + total_swap_pages; |
b95c35e7 | 408 | unsigned long points = 0; |
1da177e4 | 409 | |
19c5d45a | 410 | read_lock(&tasklist_lock); |
b95c35e7 | 411 | if (pid_alive(task)) |
a7f638f9 DR |
412 | points = oom_badness(task, NULL, NULL, totalpages) * |
413 | 1000 / totalpages; | |
19c5d45a | 414 | read_unlock(&tasklist_lock); |
1da177e4 LT |
415 | return sprintf(buffer, "%lu\n", points); |
416 | } | |
417 | ||
d85f50d5 | 418 | struct limit_names { |
cedbccab AD |
419 | const char *name; |
420 | const char *unit; | |
d85f50d5 NH |
421 | }; |
422 | ||
423 | static const struct limit_names lnames[RLIM_NLIMITS] = { | |
cff4edb5 | 424 | [RLIMIT_CPU] = {"Max cpu time", "seconds"}, |
d85f50d5 NH |
425 | [RLIMIT_FSIZE] = {"Max file size", "bytes"}, |
426 | [RLIMIT_DATA] = {"Max data size", "bytes"}, | |
427 | [RLIMIT_STACK] = {"Max stack size", "bytes"}, | |
428 | [RLIMIT_CORE] = {"Max core file size", "bytes"}, | |
429 | [RLIMIT_RSS] = {"Max resident set", "bytes"}, | |
430 | [RLIMIT_NPROC] = {"Max processes", "processes"}, | |
431 | [RLIMIT_NOFILE] = {"Max open files", "files"}, | |
432 | [RLIMIT_MEMLOCK] = {"Max locked memory", "bytes"}, | |
433 | [RLIMIT_AS] = {"Max address space", "bytes"}, | |
434 | [RLIMIT_LOCKS] = {"Max file locks", "locks"}, | |
435 | [RLIMIT_SIGPENDING] = {"Max pending signals", "signals"}, | |
436 | [RLIMIT_MSGQUEUE] = {"Max msgqueue size", "bytes"}, | |
437 | [RLIMIT_NICE] = {"Max nice priority", NULL}, | |
438 | [RLIMIT_RTPRIO] = {"Max realtime priority", NULL}, | |
8808117c | 439 | [RLIMIT_RTTIME] = {"Max realtime timeout", "us"}, |
d85f50d5 NH |
440 | }; |
441 | ||
442 | /* Display limits for a process */ | |
1c963eb1 AD |
443 | static int proc_pid_limits(struct seq_file *m, struct pid_namespace *ns, |
444 | struct pid *pid, struct task_struct *task) | |
d85f50d5 NH |
445 | { |
446 | unsigned int i; | |
d85f50d5 | 447 | unsigned long flags; |
d85f50d5 NH |
448 | |
449 | struct rlimit rlim[RLIM_NLIMITS]; | |
450 | ||
a6bebbc8 | 451 | if (!lock_task_sighand(task, &flags)) |
d85f50d5 | 452 | return 0; |
d85f50d5 NH |
453 | memcpy(rlim, task->signal->rlim, sizeof(struct rlimit) * RLIM_NLIMITS); |
454 | unlock_task_sighand(task, &flags); | |
d85f50d5 NH |
455 | |
456 | /* | |
457 | * print the file header | |
458 | */ | |
1c963eb1 | 459 | seq_printf(m, "%-25s %-20s %-20s %-10s\n", |
d85f50d5 NH |
460 | "Limit", "Soft Limit", "Hard Limit", "Units"); |
461 | ||
462 | for (i = 0; i < RLIM_NLIMITS; i++) { | |
463 | if (rlim[i].rlim_cur == RLIM_INFINITY) | |
1c963eb1 | 464 | seq_printf(m, "%-25s %-20s ", |
d85f50d5 NH |
465 | lnames[i].name, "unlimited"); |
466 | else | |
1c963eb1 | 467 | seq_printf(m, "%-25s %-20lu ", |
d85f50d5 NH |
468 | lnames[i].name, rlim[i].rlim_cur); |
469 | ||
470 | if (rlim[i].rlim_max == RLIM_INFINITY) | |
1c963eb1 | 471 | seq_printf(m, "%-20s ", "unlimited"); |
d85f50d5 | 472 | else |
1c963eb1 | 473 | seq_printf(m, "%-20lu ", rlim[i].rlim_max); |
d85f50d5 NH |
474 | |
475 | if (lnames[i].unit) | |
1c963eb1 | 476 | seq_printf(m, "%-10s\n", lnames[i].unit); |
d85f50d5 | 477 | else |
1c963eb1 | 478 | seq_putc(m, '\n'); |
d85f50d5 NH |
479 | } |
480 | ||
1c963eb1 | 481 | return 0; |
d85f50d5 NH |
482 | } |
483 | ||
ebcb6734 | 484 | #ifdef CONFIG_HAVE_ARCH_TRACEHOOK |
09d93bd6 AD |
485 | static int proc_pid_syscall(struct seq_file *m, struct pid_namespace *ns, |
486 | struct pid *pid, struct task_struct *task) | |
ebcb6734 RM |
487 | { |
488 | long nr; | |
489 | unsigned long args[6], sp, pc; | |
a9712bc1 AV |
490 | int res = lock_trace(task); |
491 | if (res) | |
492 | return res; | |
ebcb6734 RM |
493 | |
494 | if (task_current_syscall(task, &nr, args, 6, &sp, &pc)) | |
09d93bd6 | 495 | seq_puts(m, "running\n"); |
a9712bc1 | 496 | else if (nr < 0) |
09d93bd6 | 497 | seq_printf(m, "%ld 0x%lx 0x%lx\n", nr, sp, pc); |
a9712bc1 | 498 | else |
09d93bd6 | 499 | seq_printf(m, |
ebcb6734 RM |
500 | "%ld 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx\n", |
501 | nr, | |
502 | args[0], args[1], args[2], args[3], args[4], args[5], | |
503 | sp, pc); | |
a9712bc1 AV |
504 | unlock_trace(task); |
505 | return res; | |
ebcb6734 RM |
506 | } |
507 | #endif /* CONFIG_HAVE_ARCH_TRACEHOOK */ | |
508 | ||
1da177e4 LT |
509 | /************************************************************************/ |
510 | /* Here the fs part begins */ | |
511 | /************************************************************************/ | |
512 | ||
513 | /* permission checks */ | |
778c1144 | 514 | static int proc_fd_access_allowed(struct inode *inode) |
1da177e4 | 515 | { |
778c1144 EB |
516 | struct task_struct *task; |
517 | int allowed = 0; | |
df26c40e EB |
518 | /* Allow access to a task's file descriptors if it is us or we |
519 | * may use ptrace attach to the process and find out that | |
520 | * information. | |
778c1144 EB |
521 | */ |
522 | task = get_proc_task(inode); | |
df26c40e | 523 | if (task) { |
006ebb40 | 524 | allowed = ptrace_may_access(task, PTRACE_MODE_READ); |
778c1144 | 525 | put_task_struct(task); |
df26c40e | 526 | } |
778c1144 | 527 | return allowed; |
1da177e4 LT |
528 | } |
529 | ||
6b4e306a | 530 | int proc_setattr(struct dentry *dentry, struct iattr *attr) |
6d76fa58 LT |
531 | { |
532 | int error; | |
533 | struct inode *inode = dentry->d_inode; | |
534 | ||
535 | if (attr->ia_valid & ATTR_MODE) | |
536 | return -EPERM; | |
537 | ||
538 | error = inode_change_ok(inode, attr); | |
1025774c CH |
539 | if (error) |
540 | return error; | |
541 | ||
1025774c CH |
542 | setattr_copy(inode, attr); |
543 | mark_inode_dirty(inode); | |
544 | return 0; | |
6d76fa58 LT |
545 | } |
546 | ||
0499680a VK |
547 | /* |
548 | * May current process learn task's sched/cmdline info (for hide_pid_min=1) | |
549 | * or euid/egid (for hide_pid_min=2)? | |
550 | */ | |
551 | static bool has_pid_permissions(struct pid_namespace *pid, | |
552 | struct task_struct *task, | |
553 | int hide_pid_min) | |
554 | { | |
555 | if (pid->hide_pid < hide_pid_min) | |
556 | return true; | |
557 | if (in_group_p(pid->pid_gid)) | |
558 | return true; | |
559 | return ptrace_may_access(task, PTRACE_MODE_READ); | |
560 | } | |
561 | ||
562 | ||
563 | static int proc_pid_permission(struct inode *inode, int mask) | |
564 | { | |
565 | struct pid_namespace *pid = inode->i_sb->s_fs_info; | |
566 | struct task_struct *task; | |
567 | bool has_perms; | |
568 | ||
569 | task = get_proc_task(inode); | |
a2ef990a XF |
570 | if (!task) |
571 | return -ESRCH; | |
0499680a VK |
572 | has_perms = has_pid_permissions(pid, task, 1); |
573 | put_task_struct(task); | |
574 | ||
575 | if (!has_perms) { | |
576 | if (pid->hide_pid == 2) { | |
577 | /* | |
578 | * Let's make getdents(), stat(), and open() | |
579 | * consistent with each other. If a process | |
580 | * may not stat() a file, it shouldn't be seen | |
581 | * in procfs at all. | |
582 | */ | |
583 | return -ENOENT; | |
584 | } | |
585 | ||
586 | return -EPERM; | |
587 | } | |
588 | return generic_permission(inode, mask); | |
589 | } | |
590 | ||
591 | ||
592 | ||
c5ef1c42 | 593 | static const struct inode_operations proc_def_inode_operations = { |
6d76fa58 LT |
594 | .setattr = proc_setattr, |
595 | }; | |
596 | ||
1da177e4 LT |
597 | #define PROC_BLOCK_SIZE (3*1024) /* 4K page size but our output routines use some slack for overruns */ |
598 | ||
599 | static ssize_t proc_info_read(struct file * file, char __user * buf, | |
600 | size_t count, loff_t *ppos) | |
601 | { | |
496ad9aa | 602 | struct inode * inode = file_inode(file); |
1da177e4 LT |
603 | unsigned long page; |
604 | ssize_t length; | |
99f89551 EB |
605 | struct task_struct *task = get_proc_task(inode); |
606 | ||
607 | length = -ESRCH; | |
608 | if (!task) | |
609 | goto out_no_task; | |
1da177e4 LT |
610 | |
611 | if (count > PROC_BLOCK_SIZE) | |
612 | count = PROC_BLOCK_SIZE; | |
99f89551 EB |
613 | |
614 | length = -ENOMEM; | |
e12ba74d | 615 | if (!(page = __get_free_page(GFP_TEMPORARY))) |
99f89551 | 616 | goto out; |
1da177e4 LT |
617 | |
618 | length = PROC_I(inode)->op.proc_read(task, (char*)page); | |
619 | ||
620 | if (length >= 0) | |
621 | length = simple_read_from_buffer(buf, count, ppos, (char *)page, length); | |
622 | free_page(page); | |
99f89551 EB |
623 | out: |
624 | put_task_struct(task); | |
625 | out_no_task: | |
1da177e4 LT |
626 | return length; |
627 | } | |
628 | ||
00977a59 | 629 | static const struct file_operations proc_info_file_operations = { |
1da177e4 | 630 | .read = proc_info_read, |
87df8424 | 631 | .llseek = generic_file_llseek, |
1da177e4 LT |
632 | }; |
633 | ||
be614086 EB |
634 | static int proc_single_show(struct seq_file *m, void *v) |
635 | { | |
636 | struct inode *inode = m->private; | |
637 | struct pid_namespace *ns; | |
638 | struct pid *pid; | |
639 | struct task_struct *task; | |
640 | int ret; | |
641 | ||
642 | ns = inode->i_sb->s_fs_info; | |
643 | pid = proc_pid(inode); | |
644 | task = get_pid_task(pid, PIDTYPE_PID); | |
645 | if (!task) | |
646 | return -ESRCH; | |
647 | ||
648 | ret = PROC_I(inode)->op.proc_show(m, ns, pid, task); | |
649 | ||
650 | put_task_struct(task); | |
651 | return ret; | |
652 | } | |
653 | ||
654 | static int proc_single_open(struct inode *inode, struct file *filp) | |
655 | { | |
c6a34058 | 656 | return single_open(filp, proc_single_show, inode); |
be614086 EB |
657 | } |
658 | ||
659 | static const struct file_operations proc_single_file_operations = { | |
660 | .open = proc_single_open, | |
661 | .read = seq_read, | |
662 | .llseek = seq_lseek, | |
663 | .release = single_release, | |
664 | }; | |
665 | ||
b409e578 | 666 | static int __mem_open(struct inode *inode, struct file *file, unsigned int mode) |
1da177e4 | 667 | { |
496ad9aa | 668 | struct task_struct *task = get_proc_task(file_inode(file)); |
e268337d LT |
669 | struct mm_struct *mm; |
670 | ||
671 | if (!task) | |
672 | return -ESRCH; | |
673 | ||
b409e578 | 674 | mm = mm_access(task, mode); |
e268337d LT |
675 | put_task_struct(task); |
676 | ||
677 | if (IS_ERR(mm)) | |
678 | return PTR_ERR(mm); | |
679 | ||
6d08f2c7 ON |
680 | if (mm) { |
681 | /* ensure this mm_struct can't be freed */ | |
682 | atomic_inc(&mm->mm_count); | |
683 | /* but do not pin its memory */ | |
684 | mmput(mm); | |
685 | } | |
686 | ||
e268337d LT |
687 | file->private_data = mm; |
688 | ||
1da177e4 LT |
689 | return 0; |
690 | } | |
691 | ||
b409e578 CW |
692 | static int mem_open(struct inode *inode, struct file *file) |
693 | { | |
bc452b4b DH |
694 | int ret = __mem_open(inode, file, PTRACE_MODE_ATTACH); |
695 | ||
696 | /* OK to pass negative loff_t, we can catch out-of-range */ | |
697 | file->f_mode |= FMODE_UNSIGNED_OFFSET; | |
698 | ||
699 | return ret; | |
b409e578 CW |
700 | } |
701 | ||
572d34b9 ON |
702 | static ssize_t mem_rw(struct file *file, char __user *buf, |
703 | size_t count, loff_t *ppos, int write) | |
1da177e4 | 704 | { |
e268337d | 705 | struct mm_struct *mm = file->private_data; |
572d34b9 ON |
706 | unsigned long addr = *ppos; |
707 | ssize_t copied; | |
1da177e4 | 708 | char *page; |
1da177e4 | 709 | |
e268337d LT |
710 | if (!mm) |
711 | return 0; | |
99f89551 | 712 | |
30cd8903 KM |
713 | page = (char *)__get_free_page(GFP_TEMPORARY); |
714 | if (!page) | |
e268337d | 715 | return -ENOMEM; |
1da177e4 | 716 | |
f7ca54f4 | 717 | copied = 0; |
6d08f2c7 ON |
718 | if (!atomic_inc_not_zero(&mm->mm_users)) |
719 | goto free; | |
720 | ||
1da177e4 | 721 | while (count > 0) { |
572d34b9 | 722 | int this_len = min_t(int, count, PAGE_SIZE); |
1da177e4 | 723 | |
572d34b9 | 724 | if (write && copy_from_user(page, buf, this_len)) { |
1da177e4 LT |
725 | copied = -EFAULT; |
726 | break; | |
727 | } | |
572d34b9 ON |
728 | |
729 | this_len = access_remote_vm(mm, addr, page, this_len, write); | |
730 | if (!this_len) { | |
1da177e4 LT |
731 | if (!copied) |
732 | copied = -EIO; | |
733 | break; | |
734 | } | |
572d34b9 ON |
735 | |
736 | if (!write && copy_to_user(buf, page, this_len)) { | |
737 | copied = -EFAULT; | |
738 | break; | |
739 | } | |
740 | ||
741 | buf += this_len; | |
742 | addr += this_len; | |
743 | copied += this_len; | |
744 | count -= this_len; | |
1da177e4 | 745 | } |
572d34b9 | 746 | *ppos = addr; |
30cd8903 | 747 | |
6d08f2c7 ON |
748 | mmput(mm); |
749 | free: | |
30cd8903 | 750 | free_page((unsigned long) page); |
1da177e4 LT |
751 | return copied; |
752 | } | |
1da177e4 | 753 | |
572d34b9 ON |
754 | static ssize_t mem_read(struct file *file, char __user *buf, |
755 | size_t count, loff_t *ppos) | |
756 | { | |
757 | return mem_rw(file, buf, count, ppos, 0); | |
758 | } | |
759 | ||
760 | static ssize_t mem_write(struct file *file, const char __user *buf, | |
761 | size_t count, loff_t *ppos) | |
762 | { | |
763 | return mem_rw(file, (char __user*)buf, count, ppos, 1); | |
764 | } | |
765 | ||
85863e47 | 766 | loff_t mem_lseek(struct file *file, loff_t offset, int orig) |
1da177e4 LT |
767 | { |
768 | switch (orig) { | |
769 | case 0: | |
770 | file->f_pos = offset; | |
771 | break; | |
772 | case 1: | |
773 | file->f_pos += offset; | |
774 | break; | |
775 | default: | |
776 | return -EINVAL; | |
777 | } | |
778 | force_successful_syscall_return(); | |
779 | return file->f_pos; | |
780 | } | |
781 | ||
e268337d LT |
782 | static int mem_release(struct inode *inode, struct file *file) |
783 | { | |
784 | struct mm_struct *mm = file->private_data; | |
71879d3c | 785 | if (mm) |
6d08f2c7 | 786 | mmdrop(mm); |
e268337d LT |
787 | return 0; |
788 | } | |
789 | ||
00977a59 | 790 | static const struct file_operations proc_mem_operations = { |
1da177e4 LT |
791 | .llseek = mem_lseek, |
792 | .read = mem_read, | |
793 | .write = mem_write, | |
794 | .open = mem_open, | |
e268337d | 795 | .release = mem_release, |
1da177e4 LT |
796 | }; |
797 | ||
b409e578 CW |
798 | static int environ_open(struct inode *inode, struct file *file) |
799 | { | |
800 | return __mem_open(inode, file, PTRACE_MODE_READ); | |
801 | } | |
802 | ||
315e28c8 JP |
803 | static ssize_t environ_read(struct file *file, char __user *buf, |
804 | size_t count, loff_t *ppos) | |
805 | { | |
315e28c8 JP |
806 | char *page; |
807 | unsigned long src = *ppos; | |
b409e578 CW |
808 | int ret = 0; |
809 | struct mm_struct *mm = file->private_data; | |
315e28c8 | 810 | |
b409e578 CW |
811 | if (!mm) |
812 | return 0; | |
315e28c8 | 813 | |
315e28c8 JP |
814 | page = (char *)__get_free_page(GFP_TEMPORARY); |
815 | if (!page) | |
b409e578 | 816 | return -ENOMEM; |
315e28c8 | 817 | |
d6f64b89 | 818 | ret = 0; |
b409e578 CW |
819 | if (!atomic_inc_not_zero(&mm->mm_users)) |
820 | goto free; | |
315e28c8 | 821 | while (count > 0) { |
e8905ec2 DH |
822 | size_t this_len, max_len; |
823 | int retval; | |
315e28c8 | 824 | |
e8905ec2 | 825 | if (src >= (mm->env_end - mm->env_start)) |
315e28c8 JP |
826 | break; |
827 | ||
e8905ec2 DH |
828 | this_len = mm->env_end - (mm->env_start + src); |
829 | ||
830 | max_len = min_t(size_t, PAGE_SIZE, count); | |
831 | this_len = min(max_len, this_len); | |
315e28c8 | 832 | |
b409e578 | 833 | retval = access_remote_vm(mm, (mm->env_start + src), |
315e28c8 JP |
834 | page, this_len, 0); |
835 | ||
836 | if (retval <= 0) { | |
837 | ret = retval; | |
838 | break; | |
839 | } | |
840 | ||
841 | if (copy_to_user(buf, page, retval)) { | |
842 | ret = -EFAULT; | |
843 | break; | |
844 | } | |
845 | ||
846 | ret += retval; | |
847 | src += retval; | |
848 | buf += retval; | |
849 | count -= retval; | |
850 | } | |
851 | *ppos = src; | |
315e28c8 | 852 | mmput(mm); |
b409e578 CW |
853 | |
854 | free: | |
315e28c8 | 855 | free_page((unsigned long) page); |
315e28c8 JP |
856 | return ret; |
857 | } | |
858 | ||
859 | static const struct file_operations proc_environ_operations = { | |
b409e578 | 860 | .open = environ_open, |
315e28c8 | 861 | .read = environ_read, |
87df8424 | 862 | .llseek = generic_file_llseek, |
b409e578 | 863 | .release = mem_release, |
315e28c8 JP |
864 | }; |
865 | ||
fa0cbbf1 DR |
866 | static ssize_t oom_adj_read(struct file *file, char __user *buf, size_t count, |
867 | loff_t *ppos) | |
868 | { | |
496ad9aa | 869 | struct task_struct *task = get_proc_task(file_inode(file)); |
fa0cbbf1 DR |
870 | char buffer[PROC_NUMBUF]; |
871 | int oom_adj = OOM_ADJUST_MIN; | |
872 | size_t len; | |
873 | unsigned long flags; | |
874 | ||
875 | if (!task) | |
876 | return -ESRCH; | |
877 | if (lock_task_sighand(task, &flags)) { | |
878 | if (task->signal->oom_score_adj == OOM_SCORE_ADJ_MAX) | |
879 | oom_adj = OOM_ADJUST_MAX; | |
880 | else | |
881 | oom_adj = (task->signal->oom_score_adj * -OOM_DISABLE) / | |
882 | OOM_SCORE_ADJ_MAX; | |
883 | unlock_task_sighand(task, &flags); | |
884 | } | |
885 | put_task_struct(task); | |
886 | len = snprintf(buffer, sizeof(buffer), "%d\n", oom_adj); | |
887 | return simple_read_from_buffer(buf, count, ppos, buffer, len); | |
888 | } | |
889 | ||
890 | static ssize_t oom_adj_write(struct file *file, const char __user *buf, | |
891 | size_t count, loff_t *ppos) | |
892 | { | |
893 | struct task_struct *task; | |
894 | char buffer[PROC_NUMBUF]; | |
895 | int oom_adj; | |
896 | unsigned long flags; | |
897 | int err; | |
898 | ||
899 | memset(buffer, 0, sizeof(buffer)); | |
900 | if (count > sizeof(buffer) - 1) | |
901 | count = sizeof(buffer) - 1; | |
902 | if (copy_from_user(buffer, buf, count)) { | |
903 | err = -EFAULT; | |
904 | goto out; | |
905 | } | |
906 | ||
907 | err = kstrtoint(strstrip(buffer), 0, &oom_adj); | |
908 | if (err) | |
909 | goto out; | |
910 | if ((oom_adj < OOM_ADJUST_MIN || oom_adj > OOM_ADJUST_MAX) && | |
911 | oom_adj != OOM_DISABLE) { | |
912 | err = -EINVAL; | |
913 | goto out; | |
914 | } | |
915 | ||
496ad9aa | 916 | task = get_proc_task(file_inode(file)); |
fa0cbbf1 DR |
917 | if (!task) { |
918 | err = -ESRCH; | |
919 | goto out; | |
920 | } | |
921 | ||
922 | task_lock(task); | |
923 | if (!task->mm) { | |
924 | err = -EINVAL; | |
925 | goto err_task_lock; | |
926 | } | |
927 | ||
928 | if (!lock_task_sighand(task, &flags)) { | |
929 | err = -ESRCH; | |
930 | goto err_task_lock; | |
931 | } | |
932 | ||
933 | /* | |
934 | * Scale /proc/pid/oom_score_adj appropriately ensuring that a maximum | |
935 | * value is always attainable. | |
936 | */ | |
937 | if (oom_adj == OOM_ADJUST_MAX) | |
938 | oom_adj = OOM_SCORE_ADJ_MAX; | |
939 | else | |
940 | oom_adj = (oom_adj * OOM_SCORE_ADJ_MAX) / -OOM_DISABLE; | |
941 | ||
942 | if (oom_adj < task->signal->oom_score_adj && | |
943 | !capable(CAP_SYS_RESOURCE)) { | |
944 | err = -EACCES; | |
945 | goto err_sighand; | |
946 | } | |
947 | ||
948 | /* | |
949 | * /proc/pid/oom_adj is provided for legacy purposes, ask users to use | |
950 | * /proc/pid/oom_score_adj instead. | |
951 | */ | |
87ebdc00 | 952 | pr_warn_once("%s (%d): /proc/%d/oom_adj is deprecated, please use /proc/%d/oom_score_adj instead.\n", |
fa0cbbf1 DR |
953 | current->comm, task_pid_nr(current), task_pid_nr(task), |
954 | task_pid_nr(task)); | |
955 | ||
956 | task->signal->oom_score_adj = oom_adj; | |
957 | trace_oom_score_adj_update(task); | |
958 | err_sighand: | |
959 | unlock_task_sighand(task, &flags); | |
960 | err_task_lock: | |
961 | task_unlock(task); | |
962 | put_task_struct(task); | |
963 | out: | |
964 | return err < 0 ? err : count; | |
965 | } | |
966 | ||
967 | static const struct file_operations proc_oom_adj_operations = { | |
968 | .read = oom_adj_read, | |
969 | .write = oom_adj_write, | |
970 | .llseek = generic_file_llseek, | |
971 | }; | |
972 | ||
a63d83f4 DR |
973 | static ssize_t oom_score_adj_read(struct file *file, char __user *buf, |
974 | size_t count, loff_t *ppos) | |
975 | { | |
496ad9aa | 976 | struct task_struct *task = get_proc_task(file_inode(file)); |
a63d83f4 | 977 | char buffer[PROC_NUMBUF]; |
a9c58b90 | 978 | short oom_score_adj = OOM_SCORE_ADJ_MIN; |
a63d83f4 DR |
979 | unsigned long flags; |
980 | size_t len; | |
981 | ||
982 | if (!task) | |
983 | return -ESRCH; | |
984 | if (lock_task_sighand(task, &flags)) { | |
985 | oom_score_adj = task->signal->oom_score_adj; | |
986 | unlock_task_sighand(task, &flags); | |
987 | } | |
988 | put_task_struct(task); | |
a9c58b90 | 989 | len = snprintf(buffer, sizeof(buffer), "%hd\n", oom_score_adj); |
a63d83f4 DR |
990 | return simple_read_from_buffer(buf, count, ppos, buffer, len); |
991 | } | |
992 | ||
993 | static ssize_t oom_score_adj_write(struct file *file, const char __user *buf, | |
994 | size_t count, loff_t *ppos) | |
995 | { | |
996 | struct task_struct *task; | |
997 | char buffer[PROC_NUMBUF]; | |
998 | unsigned long flags; | |
0a8cb8e3 | 999 | int oom_score_adj; |
a63d83f4 DR |
1000 | int err; |
1001 | ||
1002 | memset(buffer, 0, sizeof(buffer)); | |
1003 | if (count > sizeof(buffer) - 1) | |
1004 | count = sizeof(buffer) - 1; | |
723548bf DR |
1005 | if (copy_from_user(buffer, buf, count)) { |
1006 | err = -EFAULT; | |
1007 | goto out; | |
1008 | } | |
a63d83f4 | 1009 | |
0a8cb8e3 | 1010 | err = kstrtoint(strstrip(buffer), 0, &oom_score_adj); |
a63d83f4 | 1011 | if (err) |
723548bf | 1012 | goto out; |
a63d83f4 | 1013 | if (oom_score_adj < OOM_SCORE_ADJ_MIN || |
723548bf DR |
1014 | oom_score_adj > OOM_SCORE_ADJ_MAX) { |
1015 | err = -EINVAL; | |
1016 | goto out; | |
1017 | } | |
a63d83f4 | 1018 | |
496ad9aa | 1019 | task = get_proc_task(file_inode(file)); |
723548bf DR |
1020 | if (!task) { |
1021 | err = -ESRCH; | |
1022 | goto out; | |
1023 | } | |
d19d5476 DR |
1024 | |
1025 | task_lock(task); | |
1026 | if (!task->mm) { | |
1027 | err = -EINVAL; | |
1028 | goto err_task_lock; | |
1029 | } | |
1030 | ||
a63d83f4 | 1031 | if (!lock_task_sighand(task, &flags)) { |
723548bf | 1032 | err = -ESRCH; |
d19d5476 | 1033 | goto err_task_lock; |
a63d83f4 | 1034 | } |
d19d5476 | 1035 | |
a9c58b90 | 1036 | if ((short)oom_score_adj < task->signal->oom_score_adj_min && |
a63d83f4 | 1037 | !capable(CAP_SYS_RESOURCE)) { |
723548bf DR |
1038 | err = -EACCES; |
1039 | goto err_sighand; | |
a63d83f4 DR |
1040 | } |
1041 | ||
a9c58b90 | 1042 | task->signal->oom_score_adj = (short)oom_score_adj; |
dabb16f6 | 1043 | if (has_capability_noaudit(current, CAP_SYS_RESOURCE)) |
a9c58b90 | 1044 | task->signal->oom_score_adj_min = (short)oom_score_adj; |
43d2b113 | 1045 | trace_oom_score_adj_update(task); |
01dc52eb | 1046 | |
723548bf | 1047 | err_sighand: |
a63d83f4 | 1048 | unlock_task_sighand(task, &flags); |
d19d5476 DR |
1049 | err_task_lock: |
1050 | task_unlock(task); | |
a63d83f4 | 1051 | put_task_struct(task); |
723548bf DR |
1052 | out: |
1053 | return err < 0 ? err : count; | |
a63d83f4 DR |
1054 | } |
1055 | ||
1056 | static const struct file_operations proc_oom_score_adj_operations = { | |
1057 | .read = oom_score_adj_read, | |
1058 | .write = oom_score_adj_write, | |
6038f373 | 1059 | .llseek = default_llseek, |
a63d83f4 DR |
1060 | }; |
1061 | ||
1da177e4 LT |
1062 | #ifdef CONFIG_AUDITSYSCALL |
1063 | #define TMPBUFLEN 21 | |
1064 | static ssize_t proc_loginuid_read(struct file * file, char __user * buf, | |
1065 | size_t count, loff_t *ppos) | |
1066 | { | |
496ad9aa | 1067 | struct inode * inode = file_inode(file); |
99f89551 | 1068 | struct task_struct *task = get_proc_task(inode); |
1da177e4 LT |
1069 | ssize_t length; |
1070 | char tmpbuf[TMPBUFLEN]; | |
1071 | ||
99f89551 EB |
1072 | if (!task) |
1073 | return -ESRCH; | |
1da177e4 | 1074 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", |
e1760bd5 EB |
1075 | from_kuid(file->f_cred->user_ns, |
1076 | audit_get_loginuid(task))); | |
99f89551 | 1077 | put_task_struct(task); |
1da177e4 LT |
1078 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); |
1079 | } | |
1080 | ||
1081 | static ssize_t proc_loginuid_write(struct file * file, const char __user * buf, | |
1082 | size_t count, loff_t *ppos) | |
1083 | { | |
496ad9aa | 1084 | struct inode * inode = file_inode(file); |
1da177e4 LT |
1085 | char *page, *tmp; |
1086 | ssize_t length; | |
1da177e4 | 1087 | uid_t loginuid; |
e1760bd5 | 1088 | kuid_t kloginuid; |
1da177e4 | 1089 | |
7dc52157 PM |
1090 | rcu_read_lock(); |
1091 | if (current != pid_task(proc_pid(inode), PIDTYPE_PID)) { | |
1092 | rcu_read_unlock(); | |
1da177e4 | 1093 | return -EPERM; |
7dc52157 PM |
1094 | } |
1095 | rcu_read_unlock(); | |
1da177e4 | 1096 | |
e0182909 AV |
1097 | if (count >= PAGE_SIZE) |
1098 | count = PAGE_SIZE - 1; | |
1da177e4 LT |
1099 | |
1100 | if (*ppos != 0) { | |
1101 | /* No partial writes. */ | |
1102 | return -EINVAL; | |
1103 | } | |
e12ba74d | 1104 | page = (char*)__get_free_page(GFP_TEMPORARY); |
1da177e4 LT |
1105 | if (!page) |
1106 | return -ENOMEM; | |
1107 | length = -EFAULT; | |
1108 | if (copy_from_user(page, buf, count)) | |
1109 | goto out_free_page; | |
1110 | ||
e0182909 | 1111 | page[count] = '\0'; |
1da177e4 LT |
1112 | loginuid = simple_strtoul(page, &tmp, 10); |
1113 | if (tmp == page) { | |
1114 | length = -EINVAL; | |
1115 | goto out_free_page; | |
1116 | ||
1117 | } | |
81407c84 EP |
1118 | |
1119 | /* is userspace tring to explicitly UNSET the loginuid? */ | |
1120 | if (loginuid == AUDIT_UID_UNSET) { | |
1121 | kloginuid = INVALID_UID; | |
1122 | } else { | |
1123 | kloginuid = make_kuid(file->f_cred->user_ns, loginuid); | |
1124 | if (!uid_valid(kloginuid)) { | |
1125 | length = -EINVAL; | |
1126 | goto out_free_page; | |
1127 | } | |
e1760bd5 EB |
1128 | } |
1129 | ||
1130 | length = audit_set_loginuid(kloginuid); | |
1da177e4 LT |
1131 | if (likely(length == 0)) |
1132 | length = count; | |
1133 | ||
1134 | out_free_page: | |
1135 | free_page((unsigned long) page); | |
1136 | return length; | |
1137 | } | |
1138 | ||
00977a59 | 1139 | static const struct file_operations proc_loginuid_operations = { |
1da177e4 LT |
1140 | .read = proc_loginuid_read, |
1141 | .write = proc_loginuid_write, | |
87df8424 | 1142 | .llseek = generic_file_llseek, |
1da177e4 | 1143 | }; |
1e0bd755 EP |
1144 | |
1145 | static ssize_t proc_sessionid_read(struct file * file, char __user * buf, | |
1146 | size_t count, loff_t *ppos) | |
1147 | { | |
496ad9aa | 1148 | struct inode * inode = file_inode(file); |
1e0bd755 EP |
1149 | struct task_struct *task = get_proc_task(inode); |
1150 | ssize_t length; | |
1151 | char tmpbuf[TMPBUFLEN]; | |
1152 | ||
1153 | if (!task) | |
1154 | return -ESRCH; | |
1155 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", | |
1156 | audit_get_sessionid(task)); | |
1157 | put_task_struct(task); | |
1158 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
1159 | } | |
1160 | ||
1161 | static const struct file_operations proc_sessionid_operations = { | |
1162 | .read = proc_sessionid_read, | |
87df8424 | 1163 | .llseek = generic_file_llseek, |
1e0bd755 | 1164 | }; |
1da177e4 LT |
1165 | #endif |
1166 | ||
f4f154fd AM |
1167 | #ifdef CONFIG_FAULT_INJECTION |
1168 | static ssize_t proc_fault_inject_read(struct file * file, char __user * buf, | |
1169 | size_t count, loff_t *ppos) | |
1170 | { | |
496ad9aa | 1171 | struct task_struct *task = get_proc_task(file_inode(file)); |
f4f154fd AM |
1172 | char buffer[PROC_NUMBUF]; |
1173 | size_t len; | |
1174 | int make_it_fail; | |
f4f154fd AM |
1175 | |
1176 | if (!task) | |
1177 | return -ESRCH; | |
1178 | make_it_fail = task->make_it_fail; | |
1179 | put_task_struct(task); | |
1180 | ||
1181 | len = snprintf(buffer, sizeof(buffer), "%i\n", make_it_fail); | |
0c28f287 AM |
1182 | |
1183 | return simple_read_from_buffer(buf, count, ppos, buffer, len); | |
f4f154fd AM |
1184 | } |
1185 | ||
1186 | static ssize_t proc_fault_inject_write(struct file * file, | |
1187 | const char __user * buf, size_t count, loff_t *ppos) | |
1188 | { | |
1189 | struct task_struct *task; | |
1190 | char buffer[PROC_NUMBUF], *end; | |
1191 | int make_it_fail; | |
1192 | ||
1193 | if (!capable(CAP_SYS_RESOURCE)) | |
1194 | return -EPERM; | |
1195 | memset(buffer, 0, sizeof(buffer)); | |
1196 | if (count > sizeof(buffer) - 1) | |
1197 | count = sizeof(buffer) - 1; | |
1198 | if (copy_from_user(buffer, buf, count)) | |
1199 | return -EFAULT; | |
cba8aafe VL |
1200 | make_it_fail = simple_strtol(strstrip(buffer), &end, 0); |
1201 | if (*end) | |
1202 | return -EINVAL; | |
16caed31 DJ |
1203 | if (make_it_fail < 0 || make_it_fail > 1) |
1204 | return -EINVAL; | |
1205 | ||
496ad9aa | 1206 | task = get_proc_task(file_inode(file)); |
f4f154fd AM |
1207 | if (!task) |
1208 | return -ESRCH; | |
1209 | task->make_it_fail = make_it_fail; | |
1210 | put_task_struct(task); | |
cba8aafe VL |
1211 | |
1212 | return count; | |
f4f154fd AM |
1213 | } |
1214 | ||
00977a59 | 1215 | static const struct file_operations proc_fault_inject_operations = { |
f4f154fd AM |
1216 | .read = proc_fault_inject_read, |
1217 | .write = proc_fault_inject_write, | |
87df8424 | 1218 | .llseek = generic_file_llseek, |
f4f154fd AM |
1219 | }; |
1220 | #endif | |
1221 | ||
9745512c | 1222 | |
43ae34cb IM |
1223 | #ifdef CONFIG_SCHED_DEBUG |
1224 | /* | |
1225 | * Print out various scheduling related per-task fields: | |
1226 | */ | |
1227 | static int sched_show(struct seq_file *m, void *v) | |
1228 | { | |
1229 | struct inode *inode = m->private; | |
1230 | struct task_struct *p; | |
1231 | ||
43ae34cb IM |
1232 | p = get_proc_task(inode); |
1233 | if (!p) | |
1234 | return -ESRCH; | |
1235 | proc_sched_show_task(p, m); | |
1236 | ||
1237 | put_task_struct(p); | |
1238 | ||
1239 | return 0; | |
1240 | } | |
1241 | ||
1242 | static ssize_t | |
1243 | sched_write(struct file *file, const char __user *buf, | |
1244 | size_t count, loff_t *offset) | |
1245 | { | |
496ad9aa | 1246 | struct inode *inode = file_inode(file); |
43ae34cb IM |
1247 | struct task_struct *p; |
1248 | ||
43ae34cb IM |
1249 | p = get_proc_task(inode); |
1250 | if (!p) | |
1251 | return -ESRCH; | |
1252 | proc_sched_set_task(p); | |
1253 | ||
1254 | put_task_struct(p); | |
1255 | ||
1256 | return count; | |
1257 | } | |
1258 | ||
1259 | static int sched_open(struct inode *inode, struct file *filp) | |
1260 | { | |
c6a34058 | 1261 | return single_open(filp, sched_show, inode); |
43ae34cb IM |
1262 | } |
1263 | ||
1264 | static const struct file_operations proc_pid_sched_operations = { | |
1265 | .open = sched_open, | |
1266 | .read = seq_read, | |
1267 | .write = sched_write, | |
1268 | .llseek = seq_lseek, | |
5ea473a1 | 1269 | .release = single_release, |
43ae34cb IM |
1270 | }; |
1271 | ||
1272 | #endif | |
1273 | ||
5091faa4 MG |
1274 | #ifdef CONFIG_SCHED_AUTOGROUP |
1275 | /* | |
1276 | * Print out autogroup related information: | |
1277 | */ | |
1278 | static int sched_autogroup_show(struct seq_file *m, void *v) | |
1279 | { | |
1280 | struct inode *inode = m->private; | |
1281 | struct task_struct *p; | |
1282 | ||
1283 | p = get_proc_task(inode); | |
1284 | if (!p) | |
1285 | return -ESRCH; | |
1286 | proc_sched_autogroup_show_task(p, m); | |
1287 | ||
1288 | put_task_struct(p); | |
1289 | ||
1290 | return 0; | |
1291 | } | |
1292 | ||
1293 | static ssize_t | |
1294 | sched_autogroup_write(struct file *file, const char __user *buf, | |
1295 | size_t count, loff_t *offset) | |
1296 | { | |
496ad9aa | 1297 | struct inode *inode = file_inode(file); |
5091faa4 MG |
1298 | struct task_struct *p; |
1299 | char buffer[PROC_NUMBUF]; | |
0a8cb8e3 | 1300 | int nice; |
5091faa4 MG |
1301 | int err; |
1302 | ||
1303 | memset(buffer, 0, sizeof(buffer)); | |
1304 | if (count > sizeof(buffer) - 1) | |
1305 | count = sizeof(buffer) - 1; | |
1306 | if (copy_from_user(buffer, buf, count)) | |
1307 | return -EFAULT; | |
1308 | ||
0a8cb8e3 AD |
1309 | err = kstrtoint(strstrip(buffer), 0, &nice); |
1310 | if (err < 0) | |
1311 | return err; | |
5091faa4 MG |
1312 | |
1313 | p = get_proc_task(inode); | |
1314 | if (!p) | |
1315 | return -ESRCH; | |
1316 | ||
2e5b5b3a | 1317 | err = proc_sched_autogroup_set_nice(p, nice); |
5091faa4 MG |
1318 | if (err) |
1319 | count = err; | |
1320 | ||
1321 | put_task_struct(p); | |
1322 | ||
1323 | return count; | |
1324 | } | |
1325 | ||
1326 | static int sched_autogroup_open(struct inode *inode, struct file *filp) | |
1327 | { | |
1328 | int ret; | |
1329 | ||
1330 | ret = single_open(filp, sched_autogroup_show, NULL); | |
1331 | if (!ret) { | |
1332 | struct seq_file *m = filp->private_data; | |
1333 | ||
1334 | m->private = inode; | |
1335 | } | |
1336 | return ret; | |
1337 | } | |
1338 | ||
1339 | static const struct file_operations proc_pid_sched_autogroup_operations = { | |
1340 | .open = sched_autogroup_open, | |
1341 | .read = seq_read, | |
1342 | .write = sched_autogroup_write, | |
1343 | .llseek = seq_lseek, | |
1344 | .release = single_release, | |
1345 | }; | |
1346 | ||
1347 | #endif /* CONFIG_SCHED_AUTOGROUP */ | |
1348 | ||
4614a696 | 1349 | static ssize_t comm_write(struct file *file, const char __user *buf, |
1350 | size_t count, loff_t *offset) | |
1351 | { | |
496ad9aa | 1352 | struct inode *inode = file_inode(file); |
4614a696 | 1353 | struct task_struct *p; |
1354 | char buffer[TASK_COMM_LEN]; | |
830e0fc9 | 1355 | const size_t maxlen = sizeof(buffer) - 1; |
4614a696 | 1356 | |
1357 | memset(buffer, 0, sizeof(buffer)); | |
830e0fc9 | 1358 | if (copy_from_user(buffer, buf, count > maxlen ? maxlen : count)) |
4614a696 | 1359 | return -EFAULT; |
1360 | ||
1361 | p = get_proc_task(inode); | |
1362 | if (!p) | |
1363 | return -ESRCH; | |
1364 | ||
1365 | if (same_thread_group(current, p)) | |
1366 | set_task_comm(p, buffer); | |
1367 | else | |
1368 | count = -EINVAL; | |
1369 | ||
1370 | put_task_struct(p); | |
1371 | ||
1372 | return count; | |
1373 | } | |
1374 | ||
1375 | static int comm_show(struct seq_file *m, void *v) | |
1376 | { | |
1377 | struct inode *inode = m->private; | |
1378 | struct task_struct *p; | |
1379 | ||
1380 | p = get_proc_task(inode); | |
1381 | if (!p) | |
1382 | return -ESRCH; | |
1383 | ||
1384 | task_lock(p); | |
1385 | seq_printf(m, "%s\n", p->comm); | |
1386 | task_unlock(p); | |
1387 | ||
1388 | put_task_struct(p); | |
1389 | ||
1390 | return 0; | |
1391 | } | |
1392 | ||
1393 | static int comm_open(struct inode *inode, struct file *filp) | |
1394 | { | |
c6a34058 | 1395 | return single_open(filp, comm_show, inode); |
4614a696 | 1396 | } |
1397 | ||
1398 | static const struct file_operations proc_pid_set_comm_operations = { | |
1399 | .open = comm_open, | |
1400 | .read = seq_read, | |
1401 | .write = comm_write, | |
1402 | .llseek = seq_lseek, | |
1403 | .release = single_release, | |
1404 | }; | |
1405 | ||
7773fbc5 | 1406 | static int proc_exe_link(struct dentry *dentry, struct path *exe_path) |
925d1c40 MH |
1407 | { |
1408 | struct task_struct *task; | |
1409 | struct mm_struct *mm; | |
1410 | struct file *exe_file; | |
1411 | ||
7773fbc5 | 1412 | task = get_proc_task(dentry->d_inode); |
925d1c40 MH |
1413 | if (!task) |
1414 | return -ENOENT; | |
1415 | mm = get_task_mm(task); | |
1416 | put_task_struct(task); | |
1417 | if (!mm) | |
1418 | return -ENOENT; | |
1419 | exe_file = get_mm_exe_file(mm); | |
1420 | mmput(mm); | |
1421 | if (exe_file) { | |
1422 | *exe_path = exe_file->f_path; | |
1423 | path_get(&exe_file->f_path); | |
1424 | fput(exe_file); | |
1425 | return 0; | |
1426 | } else | |
1427 | return -ENOENT; | |
1428 | } | |
1429 | ||
008b150a | 1430 | static void *proc_pid_follow_link(struct dentry *dentry, struct nameidata *nd) |
1da177e4 LT |
1431 | { |
1432 | struct inode *inode = dentry->d_inode; | |
408ef013 | 1433 | struct path path; |
1da177e4 LT |
1434 | int error = -EACCES; |
1435 | ||
778c1144 EB |
1436 | /* Are we allowed to snoop on the tasks file descriptors? */ |
1437 | if (!proc_fd_access_allowed(inode)) | |
1da177e4 | 1438 | goto out; |
1da177e4 | 1439 | |
408ef013 CH |
1440 | error = PROC_I(inode)->op.proc_get_link(dentry, &path); |
1441 | if (error) | |
1442 | goto out; | |
1443 | ||
b5fb63c1 | 1444 | nd_jump_link(nd, &path); |
408ef013 | 1445 | return NULL; |
1da177e4 | 1446 | out: |
008b150a | 1447 | return ERR_PTR(error); |
1da177e4 LT |
1448 | } |
1449 | ||
3dcd25f3 | 1450 | static int do_proc_readlink(struct path *path, char __user *buffer, int buflen) |
1da177e4 | 1451 | { |
e12ba74d | 1452 | char *tmp = (char*)__get_free_page(GFP_TEMPORARY); |
3dcd25f3 | 1453 | char *pathname; |
1da177e4 LT |
1454 | int len; |
1455 | ||
1456 | if (!tmp) | |
1457 | return -ENOMEM; | |
0c28f287 | 1458 | |
7b2a69ba | 1459 | pathname = d_path(path, tmp, PAGE_SIZE); |
3dcd25f3 JB |
1460 | len = PTR_ERR(pathname); |
1461 | if (IS_ERR(pathname)) | |
1da177e4 | 1462 | goto out; |
3dcd25f3 | 1463 | len = tmp + PAGE_SIZE - 1 - pathname; |
1da177e4 LT |
1464 | |
1465 | if (len > buflen) | |
1466 | len = buflen; | |
3dcd25f3 | 1467 | if (copy_to_user(buffer, pathname, len)) |
1da177e4 LT |
1468 | len = -EFAULT; |
1469 | out: | |
1470 | free_page((unsigned long)tmp); | |
1471 | return len; | |
1472 | } | |
1473 | ||
1474 | static int proc_pid_readlink(struct dentry * dentry, char __user * buffer, int buflen) | |
1475 | { | |
1476 | int error = -EACCES; | |
1477 | struct inode *inode = dentry->d_inode; | |
3dcd25f3 | 1478 | struct path path; |
1da177e4 | 1479 | |
778c1144 EB |
1480 | /* Are we allowed to snoop on the tasks file descriptors? */ |
1481 | if (!proc_fd_access_allowed(inode)) | |
1da177e4 | 1482 | goto out; |
1da177e4 | 1483 | |
7773fbc5 | 1484 | error = PROC_I(inode)->op.proc_get_link(dentry, &path); |
1da177e4 LT |
1485 | if (error) |
1486 | goto out; | |
1487 | ||
3dcd25f3 JB |
1488 | error = do_proc_readlink(&path, buffer, buflen); |
1489 | path_put(&path); | |
1da177e4 | 1490 | out: |
1da177e4 LT |
1491 | return error; |
1492 | } | |
1493 | ||
faf60af1 | 1494 | const struct inode_operations proc_pid_link_inode_operations = { |
1da177e4 | 1495 | .readlink = proc_pid_readlink, |
6d76fa58 LT |
1496 | .follow_link = proc_pid_follow_link, |
1497 | .setattr = proc_setattr, | |
1da177e4 LT |
1498 | }; |
1499 | ||
28a6d671 EB |
1500 | |
1501 | /* building an inode */ | |
1502 | ||
6b4e306a | 1503 | struct inode *proc_pid_make_inode(struct super_block * sb, struct task_struct *task) |
28a6d671 EB |
1504 | { |
1505 | struct inode * inode; | |
1506 | struct proc_inode *ei; | |
c69e8d9c | 1507 | const struct cred *cred; |
1da177e4 | 1508 | |
28a6d671 | 1509 | /* We need a new inode */ |
1da177e4 | 1510 | |
28a6d671 EB |
1511 | inode = new_inode(sb); |
1512 | if (!inode) | |
1513 | goto out; | |
1514 | ||
1515 | /* Common stuff */ | |
1516 | ei = PROC_I(inode); | |
85fe4025 | 1517 | inode->i_ino = get_next_ino(); |
28a6d671 | 1518 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; |
28a6d671 EB |
1519 | inode->i_op = &proc_def_inode_operations; |
1520 | ||
1521 | /* | |
1522 | * grab the reference to task. | |
1523 | */ | |
1a657f78 | 1524 | ei->pid = get_task_pid(task, PIDTYPE_PID); |
28a6d671 EB |
1525 | if (!ei->pid) |
1526 | goto out_unlock; | |
1527 | ||
28a6d671 | 1528 | if (task_dumpable(task)) { |
c69e8d9c DH |
1529 | rcu_read_lock(); |
1530 | cred = __task_cred(task); | |
1531 | inode->i_uid = cred->euid; | |
1532 | inode->i_gid = cred->egid; | |
1533 | rcu_read_unlock(); | |
1da177e4 | 1534 | } |
28a6d671 EB |
1535 | security_task_to_inode(task, inode); |
1536 | ||
1da177e4 | 1537 | out: |
28a6d671 EB |
1538 | return inode; |
1539 | ||
1540 | out_unlock: | |
1541 | iput(inode); | |
1542 | return NULL; | |
1da177e4 LT |
1543 | } |
1544 | ||
6b4e306a | 1545 | int pid_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) |
1da177e4 | 1546 | { |
1da177e4 | 1547 | struct inode *inode = dentry->d_inode; |
28a6d671 | 1548 | struct task_struct *task; |
c69e8d9c | 1549 | const struct cred *cred; |
0499680a | 1550 | struct pid_namespace *pid = dentry->d_sb->s_fs_info; |
c69e8d9c | 1551 | |
28a6d671 | 1552 | generic_fillattr(inode, stat); |
1da177e4 | 1553 | |
28a6d671 | 1554 | rcu_read_lock(); |
dcb0f222 EB |
1555 | stat->uid = GLOBAL_ROOT_UID; |
1556 | stat->gid = GLOBAL_ROOT_GID; | |
28a6d671 EB |
1557 | task = pid_task(proc_pid(inode), PIDTYPE_PID); |
1558 | if (task) { | |
0499680a VK |
1559 | if (!has_pid_permissions(pid, task, 2)) { |
1560 | rcu_read_unlock(); | |
1561 | /* | |
1562 | * This doesn't prevent learning whether PID exists, | |
1563 | * it only makes getattr() consistent with readdir(). | |
1564 | */ | |
1565 | return -ENOENT; | |
1566 | } | |
28a6d671 EB |
1567 | if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) || |
1568 | task_dumpable(task)) { | |
c69e8d9c DH |
1569 | cred = __task_cred(task); |
1570 | stat->uid = cred->euid; | |
1571 | stat->gid = cred->egid; | |
1da177e4 LT |
1572 | } |
1573 | } | |
28a6d671 | 1574 | rcu_read_unlock(); |
d6e71144 | 1575 | return 0; |
1da177e4 LT |
1576 | } |
1577 | ||
1da177e4 LT |
1578 | /* dentry stuff */ |
1579 | ||
1580 | /* | |
1581 | * Exceptional case: normally we are not allowed to unhash a busy | |
1582 | * directory. In this case, however, we can do it - no aliasing problems | |
1583 | * due to the way we treat inodes. | |
1584 | * | |
1585 | * Rewrite the inode's ownerships here because the owning task may have | |
1586 | * performed a setuid(), etc. | |
99f89551 EB |
1587 | * |
1588 | * Before the /proc/pid/status file was created the only way to read | |
1589 | * the effective uid of a /process was to stat /proc/pid. Reading | |
1590 | * /proc/pid/status is slow enough that procps and other packages | |
1591 | * kept stating /proc/pid. To keep the rules in /proc simple I have | |
1592 | * made this apply to all per process world readable and executable | |
1593 | * directories. | |
1da177e4 | 1594 | */ |
0b728e19 | 1595 | int pid_revalidate(struct dentry *dentry, unsigned int flags) |
1da177e4 | 1596 | { |
34286d66 NP |
1597 | struct inode *inode; |
1598 | struct task_struct *task; | |
c69e8d9c DH |
1599 | const struct cred *cred; |
1600 | ||
0b728e19 | 1601 | if (flags & LOOKUP_RCU) |
34286d66 NP |
1602 | return -ECHILD; |
1603 | ||
1604 | inode = dentry->d_inode; | |
1605 | task = get_proc_task(inode); | |
1606 | ||
99f89551 EB |
1607 | if (task) { |
1608 | if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) || | |
1609 | task_dumpable(task)) { | |
c69e8d9c DH |
1610 | rcu_read_lock(); |
1611 | cred = __task_cred(task); | |
1612 | inode->i_uid = cred->euid; | |
1613 | inode->i_gid = cred->egid; | |
1614 | rcu_read_unlock(); | |
1da177e4 | 1615 | } else { |
dcb0f222 EB |
1616 | inode->i_uid = GLOBAL_ROOT_UID; |
1617 | inode->i_gid = GLOBAL_ROOT_GID; | |
1da177e4 | 1618 | } |
9ee8ab9f | 1619 | inode->i_mode &= ~(S_ISUID | S_ISGID); |
1da177e4 | 1620 | security_task_to_inode(task, inode); |
99f89551 | 1621 | put_task_struct(task); |
1da177e4 LT |
1622 | return 1; |
1623 | } | |
1624 | d_drop(dentry); | |
1625 | return 0; | |
1626 | } | |
1627 | ||
d855a4b7 ON |
1628 | static inline bool proc_inode_is_dead(struct inode *inode) |
1629 | { | |
1630 | return !proc_pid(inode)->tasks[PIDTYPE_PID].first; | |
1631 | } | |
1632 | ||
1dd704b6 DH |
1633 | int pid_delete_dentry(const struct dentry *dentry) |
1634 | { | |
1635 | /* Is the task we represent dead? | |
1636 | * If so, then don't put the dentry on the lru list, | |
1637 | * kill it immediately. | |
1638 | */ | |
d855a4b7 | 1639 | return proc_inode_is_dead(dentry->d_inode); |
1dd704b6 DH |
1640 | } |
1641 | ||
6b4e306a | 1642 | const struct dentry_operations pid_dentry_operations = |
28a6d671 EB |
1643 | { |
1644 | .d_revalidate = pid_revalidate, | |
1645 | .d_delete = pid_delete_dentry, | |
1646 | }; | |
1647 | ||
1648 | /* Lookups */ | |
1649 | ||
1c0d04c9 EB |
1650 | /* |
1651 | * Fill a directory entry. | |
1652 | * | |
1653 | * If possible create the dcache entry and derive our inode number and | |
1654 | * file type from dcache entry. | |
1655 | * | |
1656 | * Since all of the proc inode numbers are dynamically generated, the inode | |
1657 | * numbers do not exist until the inode is cache. This means creating the | |
1658 | * the dcache entry in readdir is necessary to keep the inode numbers | |
1659 | * reported by readdir in sync with the inode numbers reported | |
1660 | * by stat. | |
1661 | */ | |
f0c3b509 | 1662 | bool proc_fill_cache(struct file *file, struct dir_context *ctx, |
6b4e306a | 1663 | const char *name, int len, |
c5141e6d | 1664 | instantiate_t instantiate, struct task_struct *task, const void *ptr) |
61a28784 | 1665 | { |
f0c3b509 | 1666 | struct dentry *child, *dir = file->f_path.dentry; |
1df98b8b | 1667 | struct qstr qname = QSTR_INIT(name, len); |
61a28784 | 1668 | struct inode *inode; |
1df98b8b AV |
1669 | unsigned type; |
1670 | ino_t ino; | |
61a28784 | 1671 | |
1df98b8b | 1672 | child = d_hash_and_lookup(dir, &qname); |
61a28784 | 1673 | if (!child) { |
1df98b8b AV |
1674 | child = d_alloc(dir, &qname); |
1675 | if (!child) | |
1676 | goto end_instantiate; | |
1677 | if (instantiate(dir->d_inode, child, task, ptr) < 0) { | |
1678 | dput(child); | |
1679 | goto end_instantiate; | |
61a28784 EB |
1680 | } |
1681 | } | |
61a28784 | 1682 | inode = child->d_inode; |
147ce699 AV |
1683 | ino = inode->i_ino; |
1684 | type = inode->i_mode >> 12; | |
61a28784 | 1685 | dput(child); |
f0c3b509 | 1686 | return dir_emit(ctx, name, len, ino, type); |
1df98b8b AV |
1687 | |
1688 | end_instantiate: | |
1689 | return dir_emit(ctx, name, len, 1, DT_UNKNOWN); | |
61a28784 EB |
1690 | } |
1691 | ||
640708a2 PE |
1692 | #ifdef CONFIG_CHECKPOINT_RESTORE |
1693 | ||
1694 | /* | |
1695 | * dname_to_vma_addr - maps a dentry name into two unsigned longs | |
1696 | * which represent vma start and end addresses. | |
1697 | */ | |
1698 | static int dname_to_vma_addr(struct dentry *dentry, | |
1699 | unsigned long *start, unsigned long *end) | |
1700 | { | |
1701 | if (sscanf(dentry->d_name.name, "%lx-%lx", start, end) != 2) | |
1702 | return -EINVAL; | |
1703 | ||
1704 | return 0; | |
1705 | } | |
1706 | ||
0b728e19 | 1707 | static int map_files_d_revalidate(struct dentry *dentry, unsigned int flags) |
640708a2 PE |
1708 | { |
1709 | unsigned long vm_start, vm_end; | |
1710 | bool exact_vma_exists = false; | |
1711 | struct mm_struct *mm = NULL; | |
1712 | struct task_struct *task; | |
1713 | const struct cred *cred; | |
1714 | struct inode *inode; | |
1715 | int status = 0; | |
1716 | ||
0b728e19 | 1717 | if (flags & LOOKUP_RCU) |
640708a2 PE |
1718 | return -ECHILD; |
1719 | ||
1720 | if (!capable(CAP_SYS_ADMIN)) { | |
41735818 | 1721 | status = -EPERM; |
640708a2 PE |
1722 | goto out_notask; |
1723 | } | |
1724 | ||
1725 | inode = dentry->d_inode; | |
1726 | task = get_proc_task(inode); | |
1727 | if (!task) | |
1728 | goto out_notask; | |
1729 | ||
2344bec7 CW |
1730 | mm = mm_access(task, PTRACE_MODE_READ); |
1731 | if (IS_ERR_OR_NULL(mm)) | |
640708a2 PE |
1732 | goto out; |
1733 | ||
1734 | if (!dname_to_vma_addr(dentry, &vm_start, &vm_end)) { | |
1735 | down_read(&mm->mmap_sem); | |
1736 | exact_vma_exists = !!find_exact_vma(mm, vm_start, vm_end); | |
1737 | up_read(&mm->mmap_sem); | |
1738 | } | |
1739 | ||
1740 | mmput(mm); | |
1741 | ||
1742 | if (exact_vma_exists) { | |
1743 | if (task_dumpable(task)) { | |
1744 | rcu_read_lock(); | |
1745 | cred = __task_cred(task); | |
1746 | inode->i_uid = cred->euid; | |
1747 | inode->i_gid = cred->egid; | |
1748 | rcu_read_unlock(); | |
1749 | } else { | |
dcb0f222 EB |
1750 | inode->i_uid = GLOBAL_ROOT_UID; |
1751 | inode->i_gid = GLOBAL_ROOT_GID; | |
640708a2 PE |
1752 | } |
1753 | security_task_to_inode(task, inode); | |
1754 | status = 1; | |
1755 | } | |
1756 | ||
1757 | out: | |
1758 | put_task_struct(task); | |
1759 | ||
1760 | out_notask: | |
1761 | if (status <= 0) | |
1762 | d_drop(dentry); | |
1763 | ||
1764 | return status; | |
1765 | } | |
1766 | ||
1767 | static const struct dentry_operations tid_map_files_dentry_operations = { | |
1768 | .d_revalidate = map_files_d_revalidate, | |
1769 | .d_delete = pid_delete_dentry, | |
1770 | }; | |
1771 | ||
1772 | static int proc_map_files_get_link(struct dentry *dentry, struct path *path) | |
1773 | { | |
1774 | unsigned long vm_start, vm_end; | |
1775 | struct vm_area_struct *vma; | |
1776 | struct task_struct *task; | |
1777 | struct mm_struct *mm; | |
1778 | int rc; | |
1779 | ||
1780 | rc = -ENOENT; | |
1781 | task = get_proc_task(dentry->d_inode); | |
1782 | if (!task) | |
1783 | goto out; | |
1784 | ||
1785 | mm = get_task_mm(task); | |
1786 | put_task_struct(task); | |
1787 | if (!mm) | |
1788 | goto out; | |
1789 | ||
1790 | rc = dname_to_vma_addr(dentry, &vm_start, &vm_end); | |
1791 | if (rc) | |
1792 | goto out_mmput; | |
1793 | ||
70335abb | 1794 | rc = -ENOENT; |
640708a2 PE |
1795 | down_read(&mm->mmap_sem); |
1796 | vma = find_exact_vma(mm, vm_start, vm_end); | |
1797 | if (vma && vma->vm_file) { | |
1798 | *path = vma->vm_file->f_path; | |
1799 | path_get(path); | |
1800 | rc = 0; | |
1801 | } | |
1802 | up_read(&mm->mmap_sem); | |
1803 | ||
1804 | out_mmput: | |
1805 | mmput(mm); | |
1806 | out: | |
1807 | return rc; | |
1808 | } | |
1809 | ||
1810 | struct map_files_info { | |
7b540d06 | 1811 | fmode_t mode; |
640708a2 PE |
1812 | unsigned long len; |
1813 | unsigned char name[4*sizeof(long)+2]; /* max: %lx-%lx\0 */ | |
1814 | }; | |
1815 | ||
c52a47ac | 1816 | static int |
640708a2 PE |
1817 | proc_map_files_instantiate(struct inode *dir, struct dentry *dentry, |
1818 | struct task_struct *task, const void *ptr) | |
1819 | { | |
7b540d06 | 1820 | fmode_t mode = (fmode_t)(unsigned long)ptr; |
640708a2 PE |
1821 | struct proc_inode *ei; |
1822 | struct inode *inode; | |
1823 | ||
640708a2 PE |
1824 | inode = proc_pid_make_inode(dir->i_sb, task); |
1825 | if (!inode) | |
c52a47ac | 1826 | return -ENOENT; |
640708a2 PE |
1827 | |
1828 | ei = PROC_I(inode); | |
1829 | ei->op.proc_get_link = proc_map_files_get_link; | |
1830 | ||
1831 | inode->i_op = &proc_pid_link_inode_operations; | |
1832 | inode->i_size = 64; | |
1833 | inode->i_mode = S_IFLNK; | |
1834 | ||
7b540d06 | 1835 | if (mode & FMODE_READ) |
640708a2 | 1836 | inode->i_mode |= S_IRUSR; |
7b540d06 | 1837 | if (mode & FMODE_WRITE) |
640708a2 PE |
1838 | inode->i_mode |= S_IWUSR; |
1839 | ||
1840 | d_set_d_op(dentry, &tid_map_files_dentry_operations); | |
1841 | d_add(dentry, inode); | |
1842 | ||
c52a47ac | 1843 | return 0; |
640708a2 PE |
1844 | } |
1845 | ||
1846 | static struct dentry *proc_map_files_lookup(struct inode *dir, | |
00cd8dd3 | 1847 | struct dentry *dentry, unsigned int flags) |
640708a2 PE |
1848 | { |
1849 | unsigned long vm_start, vm_end; | |
1850 | struct vm_area_struct *vma; | |
1851 | struct task_struct *task; | |
c52a47ac | 1852 | int result; |
640708a2 PE |
1853 | struct mm_struct *mm; |
1854 | ||
c52a47ac | 1855 | result = -EPERM; |
640708a2 PE |
1856 | if (!capable(CAP_SYS_ADMIN)) |
1857 | goto out; | |
1858 | ||
c52a47ac | 1859 | result = -ENOENT; |
640708a2 PE |
1860 | task = get_proc_task(dir); |
1861 | if (!task) | |
1862 | goto out; | |
1863 | ||
c52a47ac | 1864 | result = -EACCES; |
eb94cd96 | 1865 | if (!ptrace_may_access(task, PTRACE_MODE_READ)) |
640708a2 PE |
1866 | goto out_put_task; |
1867 | ||
c52a47ac | 1868 | result = -ENOENT; |
640708a2 | 1869 | if (dname_to_vma_addr(dentry, &vm_start, &vm_end)) |
eb94cd96 | 1870 | goto out_put_task; |
640708a2 PE |
1871 | |
1872 | mm = get_task_mm(task); | |
1873 | if (!mm) | |
eb94cd96 | 1874 | goto out_put_task; |
640708a2 PE |
1875 | |
1876 | down_read(&mm->mmap_sem); | |
1877 | vma = find_exact_vma(mm, vm_start, vm_end); | |
1878 | if (!vma) | |
1879 | goto out_no_vma; | |
1880 | ||
05f56484 SK |
1881 | if (vma->vm_file) |
1882 | result = proc_map_files_instantiate(dir, dentry, task, | |
1883 | (void *)(unsigned long)vma->vm_file->f_mode); | |
640708a2 PE |
1884 | |
1885 | out_no_vma: | |
1886 | up_read(&mm->mmap_sem); | |
1887 | mmput(mm); | |
640708a2 PE |
1888 | out_put_task: |
1889 | put_task_struct(task); | |
1890 | out: | |
c52a47ac | 1891 | return ERR_PTR(result); |
640708a2 PE |
1892 | } |
1893 | ||
1894 | static const struct inode_operations proc_map_files_inode_operations = { | |
1895 | .lookup = proc_map_files_lookup, | |
1896 | .permission = proc_fd_permission, | |
1897 | .setattr = proc_setattr, | |
1898 | }; | |
1899 | ||
1900 | static int | |
f0c3b509 | 1901 | proc_map_files_readdir(struct file *file, struct dir_context *ctx) |
640708a2 | 1902 | { |
640708a2 PE |
1903 | struct vm_area_struct *vma; |
1904 | struct task_struct *task; | |
1905 | struct mm_struct *mm; | |
f0c3b509 AV |
1906 | unsigned long nr_files, pos, i; |
1907 | struct flex_array *fa = NULL; | |
1908 | struct map_files_info info; | |
1909 | struct map_files_info *p; | |
640708a2 PE |
1910 | int ret; |
1911 | ||
41735818 | 1912 | ret = -EPERM; |
640708a2 PE |
1913 | if (!capable(CAP_SYS_ADMIN)) |
1914 | goto out; | |
1915 | ||
1916 | ret = -ENOENT; | |
f0c3b509 | 1917 | task = get_proc_task(file_inode(file)); |
640708a2 PE |
1918 | if (!task) |
1919 | goto out; | |
1920 | ||
1921 | ret = -EACCES; | |
eb94cd96 | 1922 | if (!ptrace_may_access(task, PTRACE_MODE_READ)) |
640708a2 PE |
1923 | goto out_put_task; |
1924 | ||
1925 | ret = 0; | |
f0c3b509 AV |
1926 | if (!dir_emit_dots(file, ctx)) |
1927 | goto out_put_task; | |
640708a2 | 1928 | |
f0c3b509 AV |
1929 | mm = get_task_mm(task); |
1930 | if (!mm) | |
1931 | goto out_put_task; | |
1932 | down_read(&mm->mmap_sem); | |
640708a2 | 1933 | |
f0c3b509 | 1934 | nr_files = 0; |
640708a2 | 1935 | |
f0c3b509 AV |
1936 | /* |
1937 | * We need two passes here: | |
1938 | * | |
1939 | * 1) Collect vmas of mapped files with mmap_sem taken | |
1940 | * 2) Release mmap_sem and instantiate entries | |
1941 | * | |
1942 | * otherwise we get lockdep complained, since filldir() | |
1943 | * routine might require mmap_sem taken in might_fault(). | |
1944 | */ | |
640708a2 | 1945 | |
f0c3b509 AV |
1946 | for (vma = mm->mmap, pos = 2; vma; vma = vma->vm_next) { |
1947 | if (vma->vm_file && ++pos > ctx->pos) | |
1948 | nr_files++; | |
1949 | } | |
1950 | ||
1951 | if (nr_files) { | |
1952 | fa = flex_array_alloc(sizeof(info), nr_files, | |
1953 | GFP_KERNEL); | |
1954 | if (!fa || flex_array_prealloc(fa, 0, nr_files, | |
1955 | GFP_KERNEL)) { | |
1956 | ret = -ENOMEM; | |
1957 | if (fa) | |
1958 | flex_array_free(fa); | |
1959 | up_read(&mm->mmap_sem); | |
1960 | mmput(mm); | |
1961 | goto out_put_task; | |
640708a2 | 1962 | } |
f0c3b509 AV |
1963 | for (i = 0, vma = mm->mmap, pos = 2; vma; |
1964 | vma = vma->vm_next) { | |
1965 | if (!vma->vm_file) | |
1966 | continue; | |
1967 | if (++pos <= ctx->pos) | |
1968 | continue; | |
1969 | ||
1970 | info.mode = vma->vm_file->f_mode; | |
1971 | info.len = snprintf(info.name, | |
1972 | sizeof(info.name), "%lx-%lx", | |
1973 | vma->vm_start, vma->vm_end); | |
1974 | if (flex_array_put(fa, i++, &info, GFP_KERNEL)) | |
1975 | BUG(); | |
640708a2 | 1976 | } |
640708a2 | 1977 | } |
f0c3b509 AV |
1978 | up_read(&mm->mmap_sem); |
1979 | ||
1980 | for (i = 0; i < nr_files; i++) { | |
1981 | p = flex_array_get(fa, i); | |
1982 | if (!proc_fill_cache(file, ctx, | |
1983 | p->name, p->len, | |
1984 | proc_map_files_instantiate, | |
1985 | task, | |
1986 | (void *)(unsigned long)p->mode)) | |
1987 | break; | |
1988 | ctx->pos++; | |
640708a2 | 1989 | } |
f0c3b509 AV |
1990 | if (fa) |
1991 | flex_array_free(fa); | |
1992 | mmput(mm); | |
640708a2 | 1993 | |
640708a2 PE |
1994 | out_put_task: |
1995 | put_task_struct(task); | |
1996 | out: | |
1997 | return ret; | |
1998 | } | |
1999 | ||
2000 | static const struct file_operations proc_map_files_operations = { | |
2001 | .read = generic_read_dir, | |
f0c3b509 | 2002 | .iterate = proc_map_files_readdir, |
640708a2 PE |
2003 | .llseek = default_llseek, |
2004 | }; | |
2005 | ||
48f6a7a5 PE |
2006 | struct timers_private { |
2007 | struct pid *pid; | |
2008 | struct task_struct *task; | |
2009 | struct sighand_struct *sighand; | |
57b8015e | 2010 | struct pid_namespace *ns; |
48f6a7a5 PE |
2011 | unsigned long flags; |
2012 | }; | |
2013 | ||
2014 | static void *timers_start(struct seq_file *m, loff_t *pos) | |
2015 | { | |
2016 | struct timers_private *tp = m->private; | |
2017 | ||
2018 | tp->task = get_pid_task(tp->pid, PIDTYPE_PID); | |
2019 | if (!tp->task) | |
2020 | return ERR_PTR(-ESRCH); | |
2021 | ||
2022 | tp->sighand = lock_task_sighand(tp->task, &tp->flags); | |
2023 | if (!tp->sighand) | |
2024 | return ERR_PTR(-ESRCH); | |
2025 | ||
2026 | return seq_list_start(&tp->task->signal->posix_timers, *pos); | |
2027 | } | |
2028 | ||
2029 | static void *timers_next(struct seq_file *m, void *v, loff_t *pos) | |
2030 | { | |
2031 | struct timers_private *tp = m->private; | |
2032 | return seq_list_next(v, &tp->task->signal->posix_timers, pos); | |
2033 | } | |
2034 | ||
2035 | static void timers_stop(struct seq_file *m, void *v) | |
2036 | { | |
2037 | struct timers_private *tp = m->private; | |
2038 | ||
2039 | if (tp->sighand) { | |
2040 | unlock_task_sighand(tp->task, &tp->flags); | |
2041 | tp->sighand = NULL; | |
2042 | } | |
2043 | ||
2044 | if (tp->task) { | |
2045 | put_task_struct(tp->task); | |
2046 | tp->task = NULL; | |
2047 | } | |
2048 | } | |
2049 | ||
2050 | static int show_timer(struct seq_file *m, void *v) | |
2051 | { | |
2052 | struct k_itimer *timer; | |
57b8015e PE |
2053 | struct timers_private *tp = m->private; |
2054 | int notify; | |
cedbccab | 2055 | static const char * const nstr[] = { |
57b8015e PE |
2056 | [SIGEV_SIGNAL] = "signal", |
2057 | [SIGEV_NONE] = "none", | |
2058 | [SIGEV_THREAD] = "thread", | |
2059 | }; | |
48f6a7a5 PE |
2060 | |
2061 | timer = list_entry((struct list_head *)v, struct k_itimer, list); | |
57b8015e PE |
2062 | notify = timer->it_sigev_notify; |
2063 | ||
48f6a7a5 | 2064 | seq_printf(m, "ID: %d\n", timer->it_id); |
57b8015e PE |
2065 | seq_printf(m, "signal: %d/%p\n", timer->sigq->info.si_signo, |
2066 | timer->sigq->info.si_value.sival_ptr); | |
2067 | seq_printf(m, "notify: %s/%s.%d\n", | |
2068 | nstr[notify & ~SIGEV_THREAD_ID], | |
2069 | (notify & SIGEV_THREAD_ID) ? "tid" : "pid", | |
2070 | pid_nr_ns(timer->it_pid, tp->ns)); | |
15ef0298 | 2071 | seq_printf(m, "ClockID: %d\n", timer->it_clock); |
48f6a7a5 PE |
2072 | |
2073 | return 0; | |
2074 | } | |
2075 | ||
2076 | static const struct seq_operations proc_timers_seq_ops = { | |
2077 | .start = timers_start, | |
2078 | .next = timers_next, | |
2079 | .stop = timers_stop, | |
2080 | .show = show_timer, | |
2081 | }; | |
2082 | ||
2083 | static int proc_timers_open(struct inode *inode, struct file *file) | |
2084 | { | |
2085 | struct timers_private *tp; | |
2086 | ||
2087 | tp = __seq_open_private(file, &proc_timers_seq_ops, | |
2088 | sizeof(struct timers_private)); | |
2089 | if (!tp) | |
2090 | return -ENOMEM; | |
2091 | ||
2092 | tp->pid = proc_pid(inode); | |
57b8015e | 2093 | tp->ns = inode->i_sb->s_fs_info; |
48f6a7a5 PE |
2094 | return 0; |
2095 | } | |
2096 | ||
2097 | static const struct file_operations proc_timers_operations = { | |
2098 | .open = proc_timers_open, | |
2099 | .read = seq_read, | |
2100 | .llseek = seq_lseek, | |
2101 | .release = seq_release_private, | |
2102 | }; | |
640708a2 PE |
2103 | #endif /* CONFIG_CHECKPOINT_RESTORE */ |
2104 | ||
c52a47ac | 2105 | static int proc_pident_instantiate(struct inode *dir, |
c5141e6d | 2106 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
444ceed8 | 2107 | { |
c5141e6d | 2108 | const struct pid_entry *p = ptr; |
444ceed8 EB |
2109 | struct inode *inode; |
2110 | struct proc_inode *ei; | |
444ceed8 | 2111 | |
61a28784 | 2112 | inode = proc_pid_make_inode(dir->i_sb, task); |
444ceed8 EB |
2113 | if (!inode) |
2114 | goto out; | |
2115 | ||
2116 | ei = PROC_I(inode); | |
2117 | inode->i_mode = p->mode; | |
2118 | if (S_ISDIR(inode->i_mode)) | |
bfe86848 | 2119 | set_nlink(inode, 2); /* Use getattr to fix if necessary */ |
444ceed8 EB |
2120 | if (p->iop) |
2121 | inode->i_op = p->iop; | |
2122 | if (p->fop) | |
2123 | inode->i_fop = p->fop; | |
2124 | ei->op = p->op; | |
fb045adb | 2125 | d_set_d_op(dentry, &pid_dentry_operations); |
444ceed8 EB |
2126 | d_add(dentry, inode); |
2127 | /* Close the race of the process dying before we return the dentry */ | |
0b728e19 | 2128 | if (pid_revalidate(dentry, 0)) |
c52a47ac | 2129 | return 0; |
444ceed8 | 2130 | out: |
c52a47ac | 2131 | return -ENOENT; |
444ceed8 EB |
2132 | } |
2133 | ||
1da177e4 LT |
2134 | static struct dentry *proc_pident_lookup(struct inode *dir, |
2135 | struct dentry *dentry, | |
c5141e6d | 2136 | const struct pid_entry *ents, |
7bcd6b0e | 2137 | unsigned int nents) |
1da177e4 | 2138 | { |
c52a47ac | 2139 | int error; |
99f89551 | 2140 | struct task_struct *task = get_proc_task(dir); |
c5141e6d | 2141 | const struct pid_entry *p, *last; |
1da177e4 | 2142 | |
c52a47ac | 2143 | error = -ENOENT; |
1da177e4 | 2144 | |
99f89551 EB |
2145 | if (!task) |
2146 | goto out_no_task; | |
1da177e4 | 2147 | |
20cdc894 EB |
2148 | /* |
2149 | * Yes, it does not scale. And it should not. Don't add | |
2150 | * new entries into /proc/<tgid>/ without very good reasons. | |
2151 | */ | |
7bcd6b0e EB |
2152 | last = &ents[nents - 1]; |
2153 | for (p = ents; p <= last; p++) { | |
1da177e4 LT |
2154 | if (p->len != dentry->d_name.len) |
2155 | continue; | |
2156 | if (!memcmp(dentry->d_name.name, p->name, p->len)) | |
2157 | break; | |
2158 | } | |
7bcd6b0e | 2159 | if (p > last) |
1da177e4 LT |
2160 | goto out; |
2161 | ||
444ceed8 | 2162 | error = proc_pident_instantiate(dir, dentry, task, p); |
1da177e4 | 2163 | out: |
99f89551 EB |
2164 | put_task_struct(task); |
2165 | out_no_task: | |
c52a47ac | 2166 | return ERR_PTR(error); |
1da177e4 LT |
2167 | } |
2168 | ||
f0c3b509 | 2169 | static int proc_pident_readdir(struct file *file, struct dir_context *ctx, |
c5141e6d | 2170 | const struct pid_entry *ents, unsigned int nents) |
28a6d671 | 2171 | { |
f0c3b509 AV |
2172 | struct task_struct *task = get_proc_task(file_inode(file)); |
2173 | const struct pid_entry *p; | |
28a6d671 | 2174 | |
28a6d671 | 2175 | if (!task) |
f0c3b509 | 2176 | return -ENOENT; |
28a6d671 | 2177 | |
f0c3b509 AV |
2178 | if (!dir_emit_dots(file, ctx)) |
2179 | goto out; | |
2180 | ||
2181 | if (ctx->pos >= nents + 2) | |
2182 | goto out; | |
28a6d671 | 2183 | |
f0c3b509 AV |
2184 | for (p = ents + (ctx->pos - 2); p <= ents + nents - 1; p++) { |
2185 | if (!proc_fill_cache(file, ctx, p->name, p->len, | |
2186 | proc_pident_instantiate, task, p)) | |
2187 | break; | |
2188 | ctx->pos++; | |
2189 | } | |
28a6d671 | 2190 | out: |
61a28784 | 2191 | put_task_struct(task); |
f0c3b509 | 2192 | return 0; |
1da177e4 LT |
2193 | } |
2194 | ||
28a6d671 EB |
2195 | #ifdef CONFIG_SECURITY |
2196 | static ssize_t proc_pid_attr_read(struct file * file, char __user * buf, | |
2197 | size_t count, loff_t *ppos) | |
2198 | { | |
496ad9aa | 2199 | struct inode * inode = file_inode(file); |
04ff9708 | 2200 | char *p = NULL; |
28a6d671 EB |
2201 | ssize_t length; |
2202 | struct task_struct *task = get_proc_task(inode); | |
2203 | ||
28a6d671 | 2204 | if (!task) |
04ff9708 | 2205 | return -ESRCH; |
28a6d671 EB |
2206 | |
2207 | length = security_getprocattr(task, | |
2fddfeef | 2208 | (char*)file->f_path.dentry->d_name.name, |
04ff9708 | 2209 | &p); |
28a6d671 | 2210 | put_task_struct(task); |
04ff9708 AV |
2211 | if (length > 0) |
2212 | length = simple_read_from_buffer(buf, count, ppos, p, length); | |
2213 | kfree(p); | |
28a6d671 | 2214 | return length; |
1da177e4 LT |
2215 | } |
2216 | ||
28a6d671 EB |
2217 | static ssize_t proc_pid_attr_write(struct file * file, const char __user * buf, |
2218 | size_t count, loff_t *ppos) | |
2219 | { | |
496ad9aa | 2220 | struct inode * inode = file_inode(file); |
28a6d671 EB |
2221 | char *page; |
2222 | ssize_t length; | |
2223 | struct task_struct *task = get_proc_task(inode); | |
2224 | ||
2225 | length = -ESRCH; | |
2226 | if (!task) | |
2227 | goto out_no_task; | |
2228 | if (count > PAGE_SIZE) | |
2229 | count = PAGE_SIZE; | |
2230 | ||
2231 | /* No partial writes. */ | |
2232 | length = -EINVAL; | |
2233 | if (*ppos != 0) | |
2234 | goto out; | |
2235 | ||
2236 | length = -ENOMEM; | |
e12ba74d | 2237 | page = (char*)__get_free_page(GFP_TEMPORARY); |
28a6d671 EB |
2238 | if (!page) |
2239 | goto out; | |
2240 | ||
2241 | length = -EFAULT; | |
2242 | if (copy_from_user(page, buf, count)) | |
2243 | goto out_free; | |
2244 | ||
107db7c7 | 2245 | /* Guard against adverse ptrace interaction */ |
9b1bf12d | 2246 | length = mutex_lock_interruptible(&task->signal->cred_guard_mutex); |
107db7c7 DH |
2247 | if (length < 0) |
2248 | goto out_free; | |
2249 | ||
28a6d671 | 2250 | length = security_setprocattr(task, |
2fddfeef | 2251 | (char*)file->f_path.dentry->d_name.name, |
28a6d671 | 2252 | (void*)page, count); |
9b1bf12d | 2253 | mutex_unlock(&task->signal->cred_guard_mutex); |
28a6d671 EB |
2254 | out_free: |
2255 | free_page((unsigned long) page); | |
2256 | out: | |
2257 | put_task_struct(task); | |
2258 | out_no_task: | |
2259 | return length; | |
2260 | } | |
2261 | ||
00977a59 | 2262 | static const struct file_operations proc_pid_attr_operations = { |
28a6d671 EB |
2263 | .read = proc_pid_attr_read, |
2264 | .write = proc_pid_attr_write, | |
87df8424 | 2265 | .llseek = generic_file_llseek, |
28a6d671 EB |
2266 | }; |
2267 | ||
c5141e6d | 2268 | static const struct pid_entry attr_dir_stuff[] = { |
631f9c18 AD |
2269 | REG("current", S_IRUGO|S_IWUGO, proc_pid_attr_operations), |
2270 | REG("prev", S_IRUGO, proc_pid_attr_operations), | |
2271 | REG("exec", S_IRUGO|S_IWUGO, proc_pid_attr_operations), | |
2272 | REG("fscreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations), | |
2273 | REG("keycreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations), | |
2274 | REG("sockcreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations), | |
28a6d671 EB |
2275 | }; |
2276 | ||
f0c3b509 | 2277 | static int proc_attr_dir_readdir(struct file *file, struct dir_context *ctx) |
28a6d671 | 2278 | { |
f0c3b509 AV |
2279 | return proc_pident_readdir(file, ctx, |
2280 | attr_dir_stuff, ARRAY_SIZE(attr_dir_stuff)); | |
28a6d671 EB |
2281 | } |
2282 | ||
00977a59 | 2283 | static const struct file_operations proc_attr_dir_operations = { |
1da177e4 | 2284 | .read = generic_read_dir, |
f0c3b509 | 2285 | .iterate = proc_attr_dir_readdir, |
6038f373 | 2286 | .llseek = default_llseek, |
1da177e4 LT |
2287 | }; |
2288 | ||
72d9dcfc | 2289 | static struct dentry *proc_attr_dir_lookup(struct inode *dir, |
00cd8dd3 | 2290 | struct dentry *dentry, unsigned int flags) |
28a6d671 | 2291 | { |
7bcd6b0e EB |
2292 | return proc_pident_lookup(dir, dentry, |
2293 | attr_dir_stuff, ARRAY_SIZE(attr_dir_stuff)); | |
28a6d671 EB |
2294 | } |
2295 | ||
c5ef1c42 | 2296 | static const struct inode_operations proc_attr_dir_inode_operations = { |
72d9dcfc | 2297 | .lookup = proc_attr_dir_lookup, |
99f89551 | 2298 | .getattr = pid_getattr, |
6d76fa58 | 2299 | .setattr = proc_setattr, |
1da177e4 LT |
2300 | }; |
2301 | ||
28a6d671 EB |
2302 | #endif |
2303 | ||
698ba7b5 | 2304 | #ifdef CONFIG_ELF_CORE |
3cb4a0bb KH |
2305 | static ssize_t proc_coredump_filter_read(struct file *file, char __user *buf, |
2306 | size_t count, loff_t *ppos) | |
2307 | { | |
496ad9aa | 2308 | struct task_struct *task = get_proc_task(file_inode(file)); |
3cb4a0bb KH |
2309 | struct mm_struct *mm; |
2310 | char buffer[PROC_NUMBUF]; | |
2311 | size_t len; | |
2312 | int ret; | |
2313 | ||
2314 | if (!task) | |
2315 | return -ESRCH; | |
2316 | ||
2317 | ret = 0; | |
2318 | mm = get_task_mm(task); | |
2319 | if (mm) { | |
2320 | len = snprintf(buffer, sizeof(buffer), "%08lx\n", | |
2321 | ((mm->flags & MMF_DUMP_FILTER_MASK) >> | |
2322 | MMF_DUMP_FILTER_SHIFT)); | |
2323 | mmput(mm); | |
2324 | ret = simple_read_from_buffer(buf, count, ppos, buffer, len); | |
2325 | } | |
2326 | ||
2327 | put_task_struct(task); | |
2328 | ||
2329 | return ret; | |
2330 | } | |
2331 | ||
2332 | static ssize_t proc_coredump_filter_write(struct file *file, | |
2333 | const char __user *buf, | |
2334 | size_t count, | |
2335 | loff_t *ppos) | |
2336 | { | |
2337 | struct task_struct *task; | |
2338 | struct mm_struct *mm; | |
2339 | char buffer[PROC_NUMBUF], *end; | |
2340 | unsigned int val; | |
2341 | int ret; | |
2342 | int i; | |
2343 | unsigned long mask; | |
2344 | ||
2345 | ret = -EFAULT; | |
2346 | memset(buffer, 0, sizeof(buffer)); | |
2347 | if (count > sizeof(buffer) - 1) | |
2348 | count = sizeof(buffer) - 1; | |
2349 | if (copy_from_user(buffer, buf, count)) | |
2350 | goto out_no_task; | |
2351 | ||
2352 | ret = -EINVAL; | |
2353 | val = (unsigned int)simple_strtoul(buffer, &end, 0); | |
2354 | if (*end == '\n') | |
2355 | end++; | |
2356 | if (end - buffer == 0) | |
2357 | goto out_no_task; | |
2358 | ||
2359 | ret = -ESRCH; | |
496ad9aa | 2360 | task = get_proc_task(file_inode(file)); |
3cb4a0bb KH |
2361 | if (!task) |
2362 | goto out_no_task; | |
2363 | ||
2364 | ret = end - buffer; | |
2365 | mm = get_task_mm(task); | |
2366 | if (!mm) | |
2367 | goto out_no_mm; | |
2368 | ||
2369 | for (i = 0, mask = 1; i < MMF_DUMP_FILTER_BITS; i++, mask <<= 1) { | |
2370 | if (val & mask) | |
2371 | set_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags); | |
2372 | else | |
2373 | clear_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags); | |
2374 | } | |
2375 | ||
2376 | mmput(mm); | |
2377 | out_no_mm: | |
2378 | put_task_struct(task); | |
2379 | out_no_task: | |
2380 | return ret; | |
2381 | } | |
2382 | ||
2383 | static const struct file_operations proc_coredump_filter_operations = { | |
2384 | .read = proc_coredump_filter_read, | |
2385 | .write = proc_coredump_filter_write, | |
87df8424 | 2386 | .llseek = generic_file_llseek, |
3cb4a0bb KH |
2387 | }; |
2388 | #endif | |
2389 | ||
aba76fdb | 2390 | #ifdef CONFIG_TASK_IO_ACCOUNTING |
297c5d92 AR |
2391 | static int do_io_accounting(struct task_struct *task, char *buffer, int whole) |
2392 | { | |
940389b8 | 2393 | struct task_io_accounting acct = task->ioac; |
5995477a | 2394 | unsigned long flags; |
293eb1e7 | 2395 | int result; |
5995477a | 2396 | |
293eb1e7 VK |
2397 | result = mutex_lock_killable(&task->signal->cred_guard_mutex); |
2398 | if (result) | |
2399 | return result; | |
2400 | ||
2401 | if (!ptrace_may_access(task, PTRACE_MODE_READ)) { | |
2402 | result = -EACCES; | |
2403 | goto out_unlock; | |
2404 | } | |
1d1221f3 | 2405 | |
5995477a AR |
2406 | if (whole && lock_task_sighand(task, &flags)) { |
2407 | struct task_struct *t = task; | |
2408 | ||
2409 | task_io_accounting_add(&acct, &task->signal->ioac); | |
2410 | while_each_thread(task, t) | |
2411 | task_io_accounting_add(&acct, &t->ioac); | |
2412 | ||
2413 | unlock_task_sighand(task, &flags); | |
297c5d92 | 2414 | } |
293eb1e7 | 2415 | result = sprintf(buffer, |
aba76fdb AM |
2416 | "rchar: %llu\n" |
2417 | "wchar: %llu\n" | |
2418 | "syscr: %llu\n" | |
2419 | "syscw: %llu\n" | |
2420 | "read_bytes: %llu\n" | |
2421 | "write_bytes: %llu\n" | |
2422 | "cancelled_write_bytes: %llu\n", | |
7c44319d AB |
2423 | (unsigned long long)acct.rchar, |
2424 | (unsigned long long)acct.wchar, | |
2425 | (unsigned long long)acct.syscr, | |
2426 | (unsigned long long)acct.syscw, | |
2427 | (unsigned long long)acct.read_bytes, | |
2428 | (unsigned long long)acct.write_bytes, | |
2429 | (unsigned long long)acct.cancelled_write_bytes); | |
293eb1e7 VK |
2430 | out_unlock: |
2431 | mutex_unlock(&task->signal->cred_guard_mutex); | |
2432 | return result; | |
297c5d92 AR |
2433 | } |
2434 | ||
2435 | static int proc_tid_io_accounting(struct task_struct *task, char *buffer) | |
2436 | { | |
2437 | return do_io_accounting(task, buffer, 0); | |
aba76fdb | 2438 | } |
297c5d92 AR |
2439 | |
2440 | static int proc_tgid_io_accounting(struct task_struct *task, char *buffer) | |
2441 | { | |
2442 | return do_io_accounting(task, buffer, 1); | |
2443 | } | |
2444 | #endif /* CONFIG_TASK_IO_ACCOUNTING */ | |
aba76fdb | 2445 | |
22d917d8 EB |
2446 | #ifdef CONFIG_USER_NS |
2447 | static int proc_id_map_open(struct inode *inode, struct file *file, | |
ccf94f1b | 2448 | const struct seq_operations *seq_ops) |
22d917d8 EB |
2449 | { |
2450 | struct user_namespace *ns = NULL; | |
2451 | struct task_struct *task; | |
2452 | struct seq_file *seq; | |
2453 | int ret = -EINVAL; | |
2454 | ||
2455 | task = get_proc_task(inode); | |
2456 | if (task) { | |
2457 | rcu_read_lock(); | |
2458 | ns = get_user_ns(task_cred_xxx(task, user_ns)); | |
2459 | rcu_read_unlock(); | |
2460 | put_task_struct(task); | |
2461 | } | |
2462 | if (!ns) | |
2463 | goto err; | |
2464 | ||
2465 | ret = seq_open(file, seq_ops); | |
2466 | if (ret) | |
2467 | goto err_put_ns; | |
2468 | ||
2469 | seq = file->private_data; | |
2470 | seq->private = ns; | |
2471 | ||
2472 | return 0; | |
2473 | err_put_ns: | |
2474 | put_user_ns(ns); | |
2475 | err: | |
2476 | return ret; | |
2477 | } | |
2478 | ||
2479 | static int proc_id_map_release(struct inode *inode, struct file *file) | |
2480 | { | |
2481 | struct seq_file *seq = file->private_data; | |
2482 | struct user_namespace *ns = seq->private; | |
2483 | put_user_ns(ns); | |
2484 | return seq_release(inode, file); | |
2485 | } | |
2486 | ||
2487 | static int proc_uid_map_open(struct inode *inode, struct file *file) | |
2488 | { | |
2489 | return proc_id_map_open(inode, file, &proc_uid_seq_operations); | |
2490 | } | |
2491 | ||
2492 | static int proc_gid_map_open(struct inode *inode, struct file *file) | |
2493 | { | |
2494 | return proc_id_map_open(inode, file, &proc_gid_seq_operations); | |
2495 | } | |
2496 | ||
f76d207a EB |
2497 | static int proc_projid_map_open(struct inode *inode, struct file *file) |
2498 | { | |
2499 | return proc_id_map_open(inode, file, &proc_projid_seq_operations); | |
2500 | } | |
2501 | ||
22d917d8 EB |
2502 | static const struct file_operations proc_uid_map_operations = { |
2503 | .open = proc_uid_map_open, | |
2504 | .write = proc_uid_map_write, | |
2505 | .read = seq_read, | |
2506 | .llseek = seq_lseek, | |
2507 | .release = proc_id_map_release, | |
2508 | }; | |
2509 | ||
2510 | static const struct file_operations proc_gid_map_operations = { | |
2511 | .open = proc_gid_map_open, | |
2512 | .write = proc_gid_map_write, | |
2513 | .read = seq_read, | |
2514 | .llseek = seq_lseek, | |
2515 | .release = proc_id_map_release, | |
2516 | }; | |
f76d207a EB |
2517 | |
2518 | static const struct file_operations proc_projid_map_operations = { | |
2519 | .open = proc_projid_map_open, | |
2520 | .write = proc_projid_map_write, | |
2521 | .read = seq_read, | |
2522 | .llseek = seq_lseek, | |
2523 | .release = proc_id_map_release, | |
2524 | }; | |
22d917d8 EB |
2525 | #endif /* CONFIG_USER_NS */ |
2526 | ||
47830723 KC |
2527 | static int proc_pid_personality(struct seq_file *m, struct pid_namespace *ns, |
2528 | struct pid *pid, struct task_struct *task) | |
2529 | { | |
a9712bc1 AV |
2530 | int err = lock_trace(task); |
2531 | if (!err) { | |
2532 | seq_printf(m, "%08x\n", task->personality); | |
2533 | unlock_trace(task); | |
2534 | } | |
2535 | return err; | |
47830723 KC |
2536 | } |
2537 | ||
28a6d671 EB |
2538 | /* |
2539 | * Thread groups | |
2540 | */ | |
00977a59 | 2541 | static const struct file_operations proc_task_operations; |
c5ef1c42 | 2542 | static const struct inode_operations proc_task_inode_operations; |
20cdc894 | 2543 | |
c5141e6d | 2544 | static const struct pid_entry tgid_base_stuff[] = { |
631f9c18 AD |
2545 | DIR("task", S_IRUGO|S_IXUGO, proc_task_inode_operations, proc_task_operations), |
2546 | DIR("fd", S_IRUSR|S_IXUSR, proc_fd_inode_operations, proc_fd_operations), | |
640708a2 PE |
2547 | #ifdef CONFIG_CHECKPOINT_RESTORE |
2548 | DIR("map_files", S_IRUSR|S_IXUSR, proc_map_files_inode_operations, proc_map_files_operations), | |
2549 | #endif | |
631f9c18 | 2550 | DIR("fdinfo", S_IRUSR|S_IXUSR, proc_fdinfo_inode_operations, proc_fdinfo_operations), |
6b4e306a | 2551 | DIR("ns", S_IRUSR|S_IXUGO, proc_ns_dir_inode_operations, proc_ns_dir_operations), |
b2211a36 | 2552 | #ifdef CONFIG_NET |
631f9c18 | 2553 | DIR("net", S_IRUGO|S_IXUGO, proc_net_inode_operations, proc_net_operations), |
b2211a36 | 2554 | #endif |
631f9c18 | 2555 | REG("environ", S_IRUSR, proc_environ_operations), |
f9ea536e | 2556 | ONE("auxv", S_IRUSR, proc_pid_auxv), |
631f9c18 | 2557 | ONE("status", S_IRUGO, proc_pid_status), |
35a35046 | 2558 | ONE("personality", S_IRUSR, proc_pid_personality), |
1c963eb1 | 2559 | ONE("limits", S_IRUGO, proc_pid_limits), |
43ae34cb | 2560 | #ifdef CONFIG_SCHED_DEBUG |
631f9c18 | 2561 | REG("sched", S_IRUGO|S_IWUSR, proc_pid_sched_operations), |
5091faa4 MG |
2562 | #endif |
2563 | #ifdef CONFIG_SCHED_AUTOGROUP | |
2564 | REG("autogroup", S_IRUGO|S_IWUSR, proc_pid_sched_autogroup_operations), | |
ebcb6734 | 2565 | #endif |
4614a696 | 2566 | REG("comm", S_IRUGO|S_IWUSR, proc_pid_set_comm_operations), |
ebcb6734 | 2567 | #ifdef CONFIG_HAVE_ARCH_TRACEHOOK |
09d93bd6 | 2568 | ONE("syscall", S_IRUSR, proc_pid_syscall), |
43ae34cb | 2569 | #endif |
631f9c18 AD |
2570 | INF("cmdline", S_IRUGO, proc_pid_cmdline), |
2571 | ONE("stat", S_IRUGO, proc_tgid_stat), | |
2572 | ONE("statm", S_IRUGO, proc_pid_statm), | |
b7643757 | 2573 | REG("maps", S_IRUGO, proc_pid_maps_operations), |
28a6d671 | 2574 | #ifdef CONFIG_NUMA |
b7643757 | 2575 | REG("numa_maps", S_IRUGO, proc_pid_numa_maps_operations), |
28a6d671 | 2576 | #endif |
631f9c18 AD |
2577 | REG("mem", S_IRUSR|S_IWUSR, proc_mem_operations), |
2578 | LNK("cwd", proc_cwd_link), | |
2579 | LNK("root", proc_root_link), | |
2580 | LNK("exe", proc_exe_link), | |
2581 | REG("mounts", S_IRUGO, proc_mounts_operations), | |
2582 | REG("mountinfo", S_IRUGO, proc_mountinfo_operations), | |
2583 | REG("mountstats", S_IRUSR, proc_mountstats_operations), | |
1e883281 | 2584 | #ifdef CONFIG_PROC_PAGE_MONITOR |
631f9c18 | 2585 | REG("clear_refs", S_IWUSR, proc_clear_refs_operations), |
b7643757 | 2586 | REG("smaps", S_IRUGO, proc_pid_smaps_operations), |
32ed74a4 | 2587 | REG("pagemap", S_IRUSR, proc_pagemap_operations), |
28a6d671 EB |
2588 | #endif |
2589 | #ifdef CONFIG_SECURITY | |
631f9c18 | 2590 | DIR("attr", S_IRUGO|S_IXUGO, proc_attr_dir_inode_operations, proc_attr_dir_operations), |
28a6d671 EB |
2591 | #endif |
2592 | #ifdef CONFIG_KALLSYMS | |
631f9c18 | 2593 | INF("wchan", S_IRUGO, proc_pid_wchan), |
28a6d671 | 2594 | #endif |
2ec220e2 | 2595 | #ifdef CONFIG_STACKTRACE |
35a35046 | 2596 | ONE("stack", S_IRUSR, proc_pid_stack), |
28a6d671 EB |
2597 | #endif |
2598 | #ifdef CONFIG_SCHEDSTATS | |
631f9c18 | 2599 | INF("schedstat", S_IRUGO, proc_pid_schedstat), |
28a6d671 | 2600 | #endif |
9745512c | 2601 | #ifdef CONFIG_LATENCYTOP |
631f9c18 | 2602 | REG("latency", S_IRUGO, proc_lstats_operations), |
9745512c | 2603 | #endif |
8793d854 | 2604 | #ifdef CONFIG_PROC_PID_CPUSET |
631f9c18 | 2605 | REG("cpuset", S_IRUGO, proc_cpuset_operations), |
a424316c PM |
2606 | #endif |
2607 | #ifdef CONFIG_CGROUPS | |
631f9c18 | 2608 | REG("cgroup", S_IRUGO, proc_cgroup_operations), |
28a6d671 | 2609 | #endif |
631f9c18 | 2610 | INF("oom_score", S_IRUGO, proc_oom_score), |
fa0cbbf1 | 2611 | REG("oom_adj", S_IRUGO|S_IWUSR, proc_oom_adj_operations), |
a63d83f4 | 2612 | REG("oom_score_adj", S_IRUGO|S_IWUSR, proc_oom_score_adj_operations), |
28a6d671 | 2613 | #ifdef CONFIG_AUDITSYSCALL |
631f9c18 AD |
2614 | REG("loginuid", S_IWUSR|S_IRUGO, proc_loginuid_operations), |
2615 | REG("sessionid", S_IRUGO, proc_sessionid_operations), | |
28a6d671 | 2616 | #endif |
f4f154fd | 2617 | #ifdef CONFIG_FAULT_INJECTION |
631f9c18 | 2618 | REG("make-it-fail", S_IRUGO|S_IWUSR, proc_fault_inject_operations), |
f4f154fd | 2619 | #endif |
698ba7b5 | 2620 | #ifdef CONFIG_ELF_CORE |
631f9c18 | 2621 | REG("coredump_filter", S_IRUGO|S_IWUSR, proc_coredump_filter_operations), |
3cb4a0bb | 2622 | #endif |
aba76fdb | 2623 | #ifdef CONFIG_TASK_IO_ACCOUNTING |
1d1221f3 | 2624 | INF("io", S_IRUSR, proc_tgid_io_accounting), |
aba76fdb | 2625 | #endif |
f133ecca CM |
2626 | #ifdef CONFIG_HARDWALL |
2627 | INF("hardwall", S_IRUGO, proc_pid_hardwall), | |
2628 | #endif | |
22d917d8 EB |
2629 | #ifdef CONFIG_USER_NS |
2630 | REG("uid_map", S_IRUGO|S_IWUSR, proc_uid_map_operations), | |
2631 | REG("gid_map", S_IRUGO|S_IWUSR, proc_gid_map_operations), | |
f76d207a | 2632 | REG("projid_map", S_IRUGO|S_IWUSR, proc_projid_map_operations), |
22d917d8 | 2633 | #endif |
48f6a7a5 PE |
2634 | #ifdef CONFIG_CHECKPOINT_RESTORE |
2635 | REG("timers", S_IRUGO, proc_timers_operations), | |
2636 | #endif | |
28a6d671 | 2637 | }; |
1da177e4 | 2638 | |
f0c3b509 | 2639 | static int proc_tgid_base_readdir(struct file *file, struct dir_context *ctx) |
1da177e4 | 2640 | { |
f0c3b509 AV |
2641 | return proc_pident_readdir(file, ctx, |
2642 | tgid_base_stuff, ARRAY_SIZE(tgid_base_stuff)); | |
1da177e4 LT |
2643 | } |
2644 | ||
00977a59 | 2645 | static const struct file_operations proc_tgid_base_operations = { |
1da177e4 | 2646 | .read = generic_read_dir, |
f0c3b509 | 2647 | .iterate = proc_tgid_base_readdir, |
6038f373 | 2648 | .llseek = default_llseek, |
1da177e4 LT |
2649 | }; |
2650 | ||
00cd8dd3 AV |
2651 | static struct dentry *proc_tgid_base_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags) |
2652 | { | |
7bcd6b0e EB |
2653 | return proc_pident_lookup(dir, dentry, |
2654 | tgid_base_stuff, ARRAY_SIZE(tgid_base_stuff)); | |
1da177e4 LT |
2655 | } |
2656 | ||
c5ef1c42 | 2657 | static const struct inode_operations proc_tgid_base_inode_operations = { |
28a6d671 | 2658 | .lookup = proc_tgid_base_lookup, |
99f89551 | 2659 | .getattr = pid_getattr, |
6d76fa58 | 2660 | .setattr = proc_setattr, |
0499680a | 2661 | .permission = proc_pid_permission, |
1da177e4 | 2662 | }; |
1da177e4 | 2663 | |
60347f67 | 2664 | static void proc_flush_task_mnt(struct vfsmount *mnt, pid_t pid, pid_t tgid) |
1da177e4 | 2665 | { |
48e6484d | 2666 | struct dentry *dentry, *leader, *dir; |
8578cea7 | 2667 | char buf[PROC_NUMBUF]; |
48e6484d EB |
2668 | struct qstr name; |
2669 | ||
2670 | name.name = buf; | |
60347f67 | 2671 | name.len = snprintf(buf, sizeof(buf), "%d", pid); |
4f522a24 | 2672 | /* no ->d_hash() rejects on procfs */ |
60347f67 | 2673 | dentry = d_hash_and_lookup(mnt->mnt_root, &name); |
48e6484d | 2674 | if (dentry) { |
29f12ca3 | 2675 | shrink_dcache_parent(dentry); |
48e6484d EB |
2676 | d_drop(dentry); |
2677 | dput(dentry); | |
2678 | } | |
1da177e4 | 2679 | |
48e6484d | 2680 | name.name = buf; |
60347f67 PE |
2681 | name.len = snprintf(buf, sizeof(buf), "%d", tgid); |
2682 | leader = d_hash_and_lookup(mnt->mnt_root, &name); | |
48e6484d EB |
2683 | if (!leader) |
2684 | goto out; | |
1da177e4 | 2685 | |
48e6484d EB |
2686 | name.name = "task"; |
2687 | name.len = strlen(name.name); | |
2688 | dir = d_hash_and_lookup(leader, &name); | |
2689 | if (!dir) | |
2690 | goto out_put_leader; | |
2691 | ||
2692 | name.name = buf; | |
60347f67 | 2693 | name.len = snprintf(buf, sizeof(buf), "%d", pid); |
48e6484d EB |
2694 | dentry = d_hash_and_lookup(dir, &name); |
2695 | if (dentry) { | |
2696 | shrink_dcache_parent(dentry); | |
2697 | d_drop(dentry); | |
2698 | dput(dentry); | |
1da177e4 | 2699 | } |
48e6484d EB |
2700 | |
2701 | dput(dir); | |
2702 | out_put_leader: | |
2703 | dput(leader); | |
2704 | out: | |
2705 | return; | |
1da177e4 LT |
2706 | } |
2707 | ||
0895e91d RD |
2708 | /** |
2709 | * proc_flush_task - Remove dcache entries for @task from the /proc dcache. | |
2710 | * @task: task that should be flushed. | |
2711 | * | |
2712 | * When flushing dentries from proc, one needs to flush them from global | |
60347f67 | 2713 | * proc (proc_mnt) and from all the namespaces' procs this task was seen |
0895e91d RD |
2714 | * in. This call is supposed to do all of this job. |
2715 | * | |
2716 | * Looks in the dcache for | |
2717 | * /proc/@pid | |
2718 | * /proc/@tgid/task/@pid | |
2719 | * if either directory is present flushes it and all of it'ts children | |
2720 | * from the dcache. | |
2721 | * | |
2722 | * It is safe and reasonable to cache /proc entries for a task until | |
2723 | * that task exits. After that they just clog up the dcache with | |
2724 | * useless entries, possibly causing useful dcache entries to be | |
2725 | * flushed instead. This routine is proved to flush those useless | |
2726 | * dcache entries at process exit time. | |
2727 | * | |
2728 | * NOTE: This routine is just an optimization so it does not guarantee | |
2729 | * that no dcache entries will exist at process exit time it | |
2730 | * just makes it very unlikely that any will persist. | |
60347f67 PE |
2731 | */ |
2732 | ||
2733 | void proc_flush_task(struct task_struct *task) | |
2734 | { | |
9fcc2d15 | 2735 | int i; |
9b4d1cbe | 2736 | struct pid *pid, *tgid; |
130f77ec PE |
2737 | struct upid *upid; |
2738 | ||
130f77ec | 2739 | pid = task_pid(task); |
9b4d1cbe | 2740 | tgid = task_tgid(task); |
130f77ec | 2741 | |
9fcc2d15 | 2742 | for (i = 0; i <= pid->level; i++) { |
130f77ec PE |
2743 | upid = &pid->numbers[i]; |
2744 | proc_flush_task_mnt(upid->ns->proc_mnt, upid->nr, | |
9b4d1cbe | 2745 | tgid->numbers[i].nr); |
130f77ec | 2746 | } |
60347f67 PE |
2747 | } |
2748 | ||
c52a47ac AV |
2749 | static int proc_pid_instantiate(struct inode *dir, |
2750 | struct dentry * dentry, | |
2751 | struct task_struct *task, const void *ptr) | |
444ceed8 | 2752 | { |
444ceed8 EB |
2753 | struct inode *inode; |
2754 | ||
61a28784 | 2755 | inode = proc_pid_make_inode(dir->i_sb, task); |
444ceed8 EB |
2756 | if (!inode) |
2757 | goto out; | |
2758 | ||
2759 | inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO; | |
2760 | inode->i_op = &proc_tgid_base_inode_operations; | |
2761 | inode->i_fop = &proc_tgid_base_operations; | |
2762 | inode->i_flags|=S_IMMUTABLE; | |
aed54175 | 2763 | |
bfe86848 MS |
2764 | set_nlink(inode, 2 + pid_entry_count_dirs(tgid_base_stuff, |
2765 | ARRAY_SIZE(tgid_base_stuff))); | |
444ceed8 | 2766 | |
fb045adb | 2767 | d_set_d_op(dentry, &pid_dentry_operations); |
444ceed8 EB |
2768 | |
2769 | d_add(dentry, inode); | |
2770 | /* Close the race of the process dying before we return the dentry */ | |
0b728e19 | 2771 | if (pid_revalidate(dentry, 0)) |
c52a47ac | 2772 | return 0; |
444ceed8 | 2773 | out: |
c52a47ac | 2774 | return -ENOENT; |
444ceed8 EB |
2775 | } |
2776 | ||
00cd8dd3 | 2777 | struct dentry *proc_pid_lookup(struct inode *dir, struct dentry * dentry, unsigned int flags) |
1da177e4 | 2778 | { |
335eb531 | 2779 | int result = -ENOENT; |
1da177e4 | 2780 | struct task_struct *task; |
1da177e4 | 2781 | unsigned tgid; |
b488893a | 2782 | struct pid_namespace *ns; |
1da177e4 | 2783 | |
dbcdb504 | 2784 | tgid = name_to_int(&dentry->d_name); |
1da177e4 LT |
2785 | if (tgid == ~0U) |
2786 | goto out; | |
2787 | ||
b488893a | 2788 | ns = dentry->d_sb->s_fs_info; |
de758734 | 2789 | rcu_read_lock(); |
b488893a | 2790 | task = find_task_by_pid_ns(tgid, ns); |
1da177e4 LT |
2791 | if (task) |
2792 | get_task_struct(task); | |
de758734 | 2793 | rcu_read_unlock(); |
1da177e4 LT |
2794 | if (!task) |
2795 | goto out; | |
2796 | ||
444ceed8 | 2797 | result = proc_pid_instantiate(dir, dentry, task, NULL); |
1da177e4 | 2798 | put_task_struct(task); |
1da177e4 | 2799 | out: |
c52a47ac | 2800 | return ERR_PTR(result); |
1da177e4 LT |
2801 | } |
2802 | ||
1da177e4 | 2803 | /* |
0804ef4b | 2804 | * Find the first task with tgid >= tgid |
0bc58a91 | 2805 | * |
1da177e4 | 2806 | */ |
19fd4bb2 EB |
2807 | struct tgid_iter { |
2808 | unsigned int tgid; | |
0804ef4b | 2809 | struct task_struct *task; |
19fd4bb2 EB |
2810 | }; |
2811 | static struct tgid_iter next_tgid(struct pid_namespace *ns, struct tgid_iter iter) | |
2812 | { | |
0804ef4b | 2813 | struct pid *pid; |
1da177e4 | 2814 | |
19fd4bb2 EB |
2815 | if (iter.task) |
2816 | put_task_struct(iter.task); | |
454cc105 | 2817 | rcu_read_lock(); |
0804ef4b | 2818 | retry: |
19fd4bb2 EB |
2819 | iter.task = NULL; |
2820 | pid = find_ge_pid(iter.tgid, ns); | |
0804ef4b | 2821 | if (pid) { |
19fd4bb2 EB |
2822 | iter.tgid = pid_nr_ns(pid, ns); |
2823 | iter.task = pid_task(pid, PIDTYPE_PID); | |
0804ef4b EB |
2824 | /* What we to know is if the pid we have find is the |
2825 | * pid of a thread_group_leader. Testing for task | |
2826 | * being a thread_group_leader is the obvious thing | |
2827 | * todo but there is a window when it fails, due to | |
2828 | * the pid transfer logic in de_thread. | |
2829 | * | |
2830 | * So we perform the straight forward test of seeing | |
2831 | * if the pid we have found is the pid of a thread | |
2832 | * group leader, and don't worry if the task we have | |
2833 | * found doesn't happen to be a thread group leader. | |
2834 | * As we don't care in the case of readdir. | |
2835 | */ | |
19fd4bb2 EB |
2836 | if (!iter.task || !has_group_leader_pid(iter.task)) { |
2837 | iter.tgid += 1; | |
0804ef4b | 2838 | goto retry; |
19fd4bb2 EB |
2839 | } |
2840 | get_task_struct(iter.task); | |
0bc58a91 | 2841 | } |
454cc105 | 2842 | rcu_read_unlock(); |
19fd4bb2 | 2843 | return iter; |
1da177e4 LT |
2844 | } |
2845 | ||
021ada7d | 2846 | #define TGID_OFFSET (FIRST_PROCESS_ENTRY + 1) |
0804ef4b | 2847 | |
1da177e4 | 2848 | /* for the /proc/ directory itself, after non-process stuff has been done */ |
f0c3b509 | 2849 | int proc_pid_readdir(struct file *file, struct dir_context *ctx) |
1da177e4 | 2850 | { |
19fd4bb2 | 2851 | struct tgid_iter iter; |
db963164 | 2852 | struct pid_namespace *ns = file->f_dentry->d_sb->s_fs_info; |
f0c3b509 | 2853 | loff_t pos = ctx->pos; |
1da177e4 | 2854 | |
021ada7d | 2855 | if (pos >= PID_MAX_LIMIT + TGID_OFFSET) |
f0c3b509 | 2856 | return 0; |
1da177e4 | 2857 | |
021ada7d | 2858 | if (pos == TGID_OFFSET - 1) { |
db963164 AV |
2859 | struct inode *inode = ns->proc_self->d_inode; |
2860 | if (!dir_emit(ctx, "self", 4, inode->i_ino, DT_LNK)) | |
f0c3b509 | 2861 | return 0; |
021ada7d AV |
2862 | iter.tgid = 0; |
2863 | } else { | |
2864 | iter.tgid = pos - TGID_OFFSET; | |
2865 | } | |
19fd4bb2 | 2866 | iter.task = NULL; |
19fd4bb2 EB |
2867 | for (iter = next_tgid(ns, iter); |
2868 | iter.task; | |
2869 | iter.tgid += 1, iter = next_tgid(ns, iter)) { | |
f0c3b509 AV |
2870 | char name[PROC_NUMBUF]; |
2871 | int len; | |
2872 | if (!has_pid_permissions(ns, iter.task, 2)) | |
2873 | continue; | |
0499680a | 2874 | |
f0c3b509 AV |
2875 | len = snprintf(name, sizeof(name), "%d", iter.tgid); |
2876 | ctx->pos = iter.tgid + TGID_OFFSET; | |
2877 | if (!proc_fill_cache(file, ctx, name, len, | |
2878 | proc_pid_instantiate, iter.task, NULL)) { | |
19fd4bb2 | 2879 | put_task_struct(iter.task); |
f0c3b509 | 2880 | return 0; |
1da177e4 | 2881 | } |
0bc58a91 | 2882 | } |
f0c3b509 | 2883 | ctx->pos = PID_MAX_LIMIT + TGID_OFFSET; |
0bc58a91 EB |
2884 | return 0; |
2885 | } | |
1da177e4 | 2886 | |
28a6d671 EB |
2887 | /* |
2888 | * Tasks | |
2889 | */ | |
c5141e6d | 2890 | static const struct pid_entry tid_base_stuff[] = { |
631f9c18 | 2891 | DIR("fd", S_IRUSR|S_IXUSR, proc_fd_inode_operations, proc_fd_operations), |
3835541d | 2892 | DIR("fdinfo", S_IRUSR|S_IXUSR, proc_fdinfo_inode_operations, proc_fdinfo_operations), |
6b4e306a | 2893 | DIR("ns", S_IRUSR|S_IXUGO, proc_ns_dir_inode_operations, proc_ns_dir_operations), |
631f9c18 | 2894 | REG("environ", S_IRUSR, proc_environ_operations), |
f9ea536e | 2895 | ONE("auxv", S_IRUSR, proc_pid_auxv), |
631f9c18 | 2896 | ONE("status", S_IRUGO, proc_pid_status), |
35a35046 | 2897 | ONE("personality", S_IRUSR, proc_pid_personality), |
1c963eb1 | 2898 | ONE("limits", S_IRUGO, proc_pid_limits), |
43ae34cb | 2899 | #ifdef CONFIG_SCHED_DEBUG |
631f9c18 | 2900 | REG("sched", S_IRUGO|S_IWUSR, proc_pid_sched_operations), |
ebcb6734 | 2901 | #endif |
4614a696 | 2902 | REG("comm", S_IRUGO|S_IWUSR, proc_pid_set_comm_operations), |
ebcb6734 | 2903 | #ifdef CONFIG_HAVE_ARCH_TRACEHOOK |
09d93bd6 | 2904 | ONE("syscall", S_IRUSR, proc_pid_syscall), |
43ae34cb | 2905 | #endif |
631f9c18 AD |
2906 | INF("cmdline", S_IRUGO, proc_pid_cmdline), |
2907 | ONE("stat", S_IRUGO, proc_tid_stat), | |
2908 | ONE("statm", S_IRUGO, proc_pid_statm), | |
b7643757 | 2909 | REG("maps", S_IRUGO, proc_tid_maps_operations), |
81841161 CG |
2910 | #ifdef CONFIG_CHECKPOINT_RESTORE |
2911 | REG("children", S_IRUGO, proc_tid_children_operations), | |
2912 | #endif | |
28a6d671 | 2913 | #ifdef CONFIG_NUMA |
b7643757 | 2914 | REG("numa_maps", S_IRUGO, proc_tid_numa_maps_operations), |
28a6d671 | 2915 | #endif |
631f9c18 AD |
2916 | REG("mem", S_IRUSR|S_IWUSR, proc_mem_operations), |
2917 | LNK("cwd", proc_cwd_link), | |
2918 | LNK("root", proc_root_link), | |
2919 | LNK("exe", proc_exe_link), | |
2920 | REG("mounts", S_IRUGO, proc_mounts_operations), | |
2921 | REG("mountinfo", S_IRUGO, proc_mountinfo_operations), | |
1e883281 | 2922 | #ifdef CONFIG_PROC_PAGE_MONITOR |
631f9c18 | 2923 | REG("clear_refs", S_IWUSR, proc_clear_refs_operations), |
b7643757 | 2924 | REG("smaps", S_IRUGO, proc_tid_smaps_operations), |
32ed74a4 | 2925 | REG("pagemap", S_IRUSR, proc_pagemap_operations), |
28a6d671 EB |
2926 | #endif |
2927 | #ifdef CONFIG_SECURITY | |
631f9c18 | 2928 | DIR("attr", S_IRUGO|S_IXUGO, proc_attr_dir_inode_operations, proc_attr_dir_operations), |
28a6d671 EB |
2929 | #endif |
2930 | #ifdef CONFIG_KALLSYMS | |
631f9c18 | 2931 | INF("wchan", S_IRUGO, proc_pid_wchan), |
28a6d671 | 2932 | #endif |
2ec220e2 | 2933 | #ifdef CONFIG_STACKTRACE |
35a35046 | 2934 | ONE("stack", S_IRUSR, proc_pid_stack), |
28a6d671 EB |
2935 | #endif |
2936 | #ifdef CONFIG_SCHEDSTATS | |
631f9c18 | 2937 | INF("schedstat", S_IRUGO, proc_pid_schedstat), |
28a6d671 | 2938 | #endif |
9745512c | 2939 | #ifdef CONFIG_LATENCYTOP |
631f9c18 | 2940 | REG("latency", S_IRUGO, proc_lstats_operations), |
9745512c | 2941 | #endif |
8793d854 | 2942 | #ifdef CONFIG_PROC_PID_CPUSET |
631f9c18 | 2943 | REG("cpuset", S_IRUGO, proc_cpuset_operations), |
a424316c PM |
2944 | #endif |
2945 | #ifdef CONFIG_CGROUPS | |
631f9c18 | 2946 | REG("cgroup", S_IRUGO, proc_cgroup_operations), |
28a6d671 | 2947 | #endif |
631f9c18 | 2948 | INF("oom_score", S_IRUGO, proc_oom_score), |
fa0cbbf1 | 2949 | REG("oom_adj", S_IRUGO|S_IWUSR, proc_oom_adj_operations), |
a63d83f4 | 2950 | REG("oom_score_adj", S_IRUGO|S_IWUSR, proc_oom_score_adj_operations), |
28a6d671 | 2951 | #ifdef CONFIG_AUDITSYSCALL |
631f9c18 | 2952 | REG("loginuid", S_IWUSR|S_IRUGO, proc_loginuid_operations), |
26ec3c64 | 2953 | REG("sessionid", S_IRUGO, proc_sessionid_operations), |
28a6d671 | 2954 | #endif |
f4f154fd | 2955 | #ifdef CONFIG_FAULT_INJECTION |
631f9c18 | 2956 | REG("make-it-fail", S_IRUGO|S_IWUSR, proc_fault_inject_operations), |
f4f154fd | 2957 | #endif |
297c5d92 | 2958 | #ifdef CONFIG_TASK_IO_ACCOUNTING |
1d1221f3 | 2959 | INF("io", S_IRUSR, proc_tid_io_accounting), |
297c5d92 | 2960 | #endif |
f133ecca CM |
2961 | #ifdef CONFIG_HARDWALL |
2962 | INF("hardwall", S_IRUGO, proc_pid_hardwall), | |
2963 | #endif | |
22d917d8 EB |
2964 | #ifdef CONFIG_USER_NS |
2965 | REG("uid_map", S_IRUGO|S_IWUSR, proc_uid_map_operations), | |
2966 | REG("gid_map", S_IRUGO|S_IWUSR, proc_gid_map_operations), | |
f76d207a | 2967 | REG("projid_map", S_IRUGO|S_IWUSR, proc_projid_map_operations), |
22d917d8 | 2968 | #endif |
28a6d671 EB |
2969 | }; |
2970 | ||
f0c3b509 | 2971 | static int proc_tid_base_readdir(struct file *file, struct dir_context *ctx) |
28a6d671 | 2972 | { |
f0c3b509 AV |
2973 | return proc_pident_readdir(file, ctx, |
2974 | tid_base_stuff, ARRAY_SIZE(tid_base_stuff)); | |
28a6d671 EB |
2975 | } |
2976 | ||
00cd8dd3 AV |
2977 | static struct dentry *proc_tid_base_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags) |
2978 | { | |
7bcd6b0e EB |
2979 | return proc_pident_lookup(dir, dentry, |
2980 | tid_base_stuff, ARRAY_SIZE(tid_base_stuff)); | |
28a6d671 EB |
2981 | } |
2982 | ||
00977a59 | 2983 | static const struct file_operations proc_tid_base_operations = { |
28a6d671 | 2984 | .read = generic_read_dir, |
f0c3b509 | 2985 | .iterate = proc_tid_base_readdir, |
6038f373 | 2986 | .llseek = default_llseek, |
28a6d671 EB |
2987 | }; |
2988 | ||
c5ef1c42 | 2989 | static const struct inode_operations proc_tid_base_inode_operations = { |
28a6d671 EB |
2990 | .lookup = proc_tid_base_lookup, |
2991 | .getattr = pid_getattr, | |
2992 | .setattr = proc_setattr, | |
2993 | }; | |
2994 | ||
c52a47ac | 2995 | static int proc_task_instantiate(struct inode *dir, |
c5141e6d | 2996 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
444ceed8 | 2997 | { |
444ceed8 | 2998 | struct inode *inode; |
61a28784 | 2999 | inode = proc_pid_make_inode(dir->i_sb, task); |
444ceed8 EB |
3000 | |
3001 | if (!inode) | |
3002 | goto out; | |
3003 | inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO; | |
3004 | inode->i_op = &proc_tid_base_inode_operations; | |
3005 | inode->i_fop = &proc_tid_base_operations; | |
3006 | inode->i_flags|=S_IMMUTABLE; | |
aed54175 | 3007 | |
bfe86848 MS |
3008 | set_nlink(inode, 2 + pid_entry_count_dirs(tid_base_stuff, |
3009 | ARRAY_SIZE(tid_base_stuff))); | |
444ceed8 | 3010 | |
fb045adb | 3011 | d_set_d_op(dentry, &pid_dentry_operations); |
444ceed8 EB |
3012 | |
3013 | d_add(dentry, inode); | |
3014 | /* Close the race of the process dying before we return the dentry */ | |
0b728e19 | 3015 | if (pid_revalidate(dentry, 0)) |
c52a47ac | 3016 | return 0; |
444ceed8 | 3017 | out: |
c52a47ac | 3018 | return -ENOENT; |
444ceed8 EB |
3019 | } |
3020 | ||
00cd8dd3 | 3021 | static struct dentry *proc_task_lookup(struct inode *dir, struct dentry * dentry, unsigned int flags) |
28a6d671 | 3022 | { |
c52a47ac | 3023 | int result = -ENOENT; |
28a6d671 EB |
3024 | struct task_struct *task; |
3025 | struct task_struct *leader = get_proc_task(dir); | |
28a6d671 | 3026 | unsigned tid; |
b488893a | 3027 | struct pid_namespace *ns; |
28a6d671 EB |
3028 | |
3029 | if (!leader) | |
3030 | goto out_no_task; | |
3031 | ||
dbcdb504 | 3032 | tid = name_to_int(&dentry->d_name); |
28a6d671 EB |
3033 | if (tid == ~0U) |
3034 | goto out; | |
3035 | ||
b488893a | 3036 | ns = dentry->d_sb->s_fs_info; |
28a6d671 | 3037 | rcu_read_lock(); |
b488893a | 3038 | task = find_task_by_pid_ns(tid, ns); |
28a6d671 EB |
3039 | if (task) |
3040 | get_task_struct(task); | |
3041 | rcu_read_unlock(); | |
3042 | if (!task) | |
3043 | goto out; | |
bac0abd6 | 3044 | if (!same_thread_group(leader, task)) |
28a6d671 EB |
3045 | goto out_drop_task; |
3046 | ||
444ceed8 | 3047 | result = proc_task_instantiate(dir, dentry, task, NULL); |
28a6d671 EB |
3048 | out_drop_task: |
3049 | put_task_struct(task); | |
3050 | out: | |
3051 | put_task_struct(leader); | |
3052 | out_no_task: | |
c52a47ac | 3053 | return ERR_PTR(result); |
28a6d671 EB |
3054 | } |
3055 | ||
0bc58a91 EB |
3056 | /* |
3057 | * Find the first tid of a thread group to return to user space. | |
3058 | * | |
3059 | * Usually this is just the thread group leader, but if the users | |
3060 | * buffer was too small or there was a seek into the middle of the | |
3061 | * directory we have more work todo. | |
3062 | * | |
3063 | * In the case of a short read we start with find_task_by_pid. | |
3064 | * | |
3065 | * In the case of a seek we start with the leader and walk nr | |
3066 | * threads past it. | |
3067 | */ | |
9f6e963f ON |
3068 | static struct task_struct *first_tid(struct pid *pid, int tid, loff_t f_pos, |
3069 | struct pid_namespace *ns) | |
0bc58a91 | 3070 | { |
d855a4b7 | 3071 | struct task_struct *pos, *task; |
9f6e963f ON |
3072 | unsigned long nr = f_pos; |
3073 | ||
3074 | if (nr != f_pos) /* 32bit overflow? */ | |
3075 | return NULL; | |
1da177e4 | 3076 | |
cc288738 | 3077 | rcu_read_lock(); |
d855a4b7 ON |
3078 | task = pid_task(pid, PIDTYPE_PID); |
3079 | if (!task) | |
3080 | goto fail; | |
3081 | ||
3082 | /* Attempt to start with the tid of a thread */ | |
9f6e963f | 3083 | if (tid && nr) { |
b488893a | 3084 | pos = find_task_by_pid_ns(tid, ns); |
d855a4b7 | 3085 | if (pos && same_thread_group(pos, task)) |
a872ff0c | 3086 | goto found; |
0bc58a91 | 3087 | } |
1da177e4 | 3088 | |
0bc58a91 | 3089 | /* If nr exceeds the number of threads there is nothing todo */ |
9f6e963f | 3090 | if (nr >= get_nr_threads(task)) |
c986c14a | 3091 | goto fail; |
1da177e4 | 3092 | |
a872ff0c ON |
3093 | /* If we haven't found our starting place yet start |
3094 | * with the leader and walk nr threads forward. | |
0bc58a91 | 3095 | */ |
d855a4b7 | 3096 | pos = task = task->group_leader; |
c986c14a | 3097 | do { |
9f6e963f | 3098 | if (!nr--) |
c986c14a | 3099 | goto found; |
d855a4b7 | 3100 | } while_each_thread(task, pos); |
c986c14a ON |
3101 | fail: |
3102 | pos = NULL; | |
3103 | goto out; | |
a872ff0c ON |
3104 | found: |
3105 | get_task_struct(pos); | |
3106 | out: | |
cc288738 | 3107 | rcu_read_unlock(); |
0bc58a91 EB |
3108 | return pos; |
3109 | } | |
3110 | ||
3111 | /* | |
3112 | * Find the next thread in the thread list. | |
3113 | * Return NULL if there is an error or no next thread. | |
3114 | * | |
3115 | * The reference to the input task_struct is released. | |
3116 | */ | |
3117 | static struct task_struct *next_tid(struct task_struct *start) | |
3118 | { | |
c1df7fb8 | 3119 | struct task_struct *pos = NULL; |
cc288738 | 3120 | rcu_read_lock(); |
c1df7fb8 | 3121 | if (pid_alive(start)) { |
0bc58a91 | 3122 | pos = next_thread(start); |
c1df7fb8 ON |
3123 | if (thread_group_leader(pos)) |
3124 | pos = NULL; | |
3125 | else | |
3126 | get_task_struct(pos); | |
3127 | } | |
cc288738 | 3128 | rcu_read_unlock(); |
0bc58a91 EB |
3129 | put_task_struct(start); |
3130 | return pos; | |
1da177e4 LT |
3131 | } |
3132 | ||
3133 | /* for the /proc/TGID/task/ directories */ | |
f0c3b509 | 3134 | static int proc_task_readdir(struct file *file, struct dir_context *ctx) |
1da177e4 | 3135 | { |
d855a4b7 ON |
3136 | struct inode *inode = file_inode(file); |
3137 | struct task_struct *task; | |
b488893a | 3138 | struct pid_namespace *ns; |
f0c3b509 | 3139 | int tid; |
1da177e4 | 3140 | |
d855a4b7 | 3141 | if (proc_inode_is_dead(inode)) |
f0c3b509 | 3142 | return -ENOENT; |
1da177e4 | 3143 | |
f0c3b509 | 3144 | if (!dir_emit_dots(file, ctx)) |
d855a4b7 | 3145 | return 0; |
1da177e4 | 3146 | |
0bc58a91 EB |
3147 | /* f_version caches the tgid value that the last readdir call couldn't |
3148 | * return. lseek aka telldir automagically resets f_version to 0. | |
3149 | */ | |
f0c3b509 AV |
3150 | ns = file->f_dentry->d_sb->s_fs_info; |
3151 | tid = (int)file->f_version; | |
3152 | file->f_version = 0; | |
d855a4b7 | 3153 | for (task = first_tid(proc_pid(inode), tid, ctx->pos - 2, ns); |
0bc58a91 | 3154 | task; |
f0c3b509 AV |
3155 | task = next_tid(task), ctx->pos++) { |
3156 | char name[PROC_NUMBUF]; | |
3157 | int len; | |
b488893a | 3158 | tid = task_pid_nr_ns(task, ns); |
f0c3b509 AV |
3159 | len = snprintf(name, sizeof(name), "%d", tid); |
3160 | if (!proc_fill_cache(file, ctx, name, len, | |
3161 | proc_task_instantiate, task, NULL)) { | |
0bc58a91 EB |
3162 | /* returning this tgid failed, save it as the first |
3163 | * pid for the next readir call */ | |
f0c3b509 | 3164 | file->f_version = (u64)tid; |
0bc58a91 | 3165 | put_task_struct(task); |
1da177e4 | 3166 | break; |
0bc58a91 | 3167 | } |
1da177e4 | 3168 | } |
d855a4b7 | 3169 | |
f0c3b509 | 3170 | return 0; |
1da177e4 | 3171 | } |
6e66b52b EB |
3172 | |
3173 | static int proc_task_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) | |
3174 | { | |
3175 | struct inode *inode = dentry->d_inode; | |
99f89551 | 3176 | struct task_struct *p = get_proc_task(inode); |
6e66b52b EB |
3177 | generic_fillattr(inode, stat); |
3178 | ||
99f89551 | 3179 | if (p) { |
99f89551 | 3180 | stat->nlink += get_nr_threads(p); |
99f89551 | 3181 | put_task_struct(p); |
6e66b52b EB |
3182 | } |
3183 | ||
3184 | return 0; | |
3185 | } | |
28a6d671 | 3186 | |
c5ef1c42 | 3187 | static const struct inode_operations proc_task_inode_operations = { |
28a6d671 EB |
3188 | .lookup = proc_task_lookup, |
3189 | .getattr = proc_task_getattr, | |
3190 | .setattr = proc_setattr, | |
0499680a | 3191 | .permission = proc_pid_permission, |
28a6d671 EB |
3192 | }; |
3193 | ||
00977a59 | 3194 | static const struct file_operations proc_task_operations = { |
28a6d671 | 3195 | .read = generic_read_dir, |
f0c3b509 | 3196 | .iterate = proc_task_readdir, |
6038f373 | 3197 | .llseek = default_llseek, |
28a6d671 | 3198 | }; |