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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/fs/proc/base.c | |
3 | * | |
4 | * Copyright (C) 1991, 1992 Linus Torvalds | |
5 | * | |
6 | * proc base directory handling functions | |
7 | * | |
8 | * 1999, Al Viro. Rewritten. Now it covers the whole per-process part. | |
9 | * Instead of using magical inumbers to determine the kind of object | |
10 | * we allocate and fill in-core inodes upon lookup. They don't even | |
11 | * go into icache. We cache the reference to task_struct upon lookup too. | |
12 | * Eventually it should become a filesystem in its own. We don't use the | |
13 | * rest of procfs anymore. | |
e070ad49 ML |
14 | * |
15 | * | |
16 | * Changelog: | |
17 | * 17-Jan-2005 | |
18 | * Allan Bezerra | |
19 | * Bruna Moreira <bruna.moreira@indt.org.br> | |
20 | * Edjard Mota <edjard.mota@indt.org.br> | |
21 | * Ilias Biris <ilias.biris@indt.org.br> | |
22 | * Mauricio Lin <mauricio.lin@indt.org.br> | |
23 | * | |
24 | * Embedded Linux Lab - 10LE Instituto Nokia de Tecnologia - INdT | |
25 | * | |
26 | * A new process specific entry (smaps) included in /proc. It shows the | |
27 | * size of rss for each memory area. The maps entry lacks information | |
28 | * about physical memory size (rss) for each mapped file, i.e., | |
29 | * rss information for executables and library files. | |
30 | * This additional information is useful for any tools that need to know | |
31 | * about physical memory consumption for a process specific library. | |
32 | * | |
33 | * Changelog: | |
34 | * 21-Feb-2005 | |
35 | * Embedded Linux Lab - 10LE Instituto Nokia de Tecnologia - INdT | |
36 | * Pud inclusion in the page table walking. | |
37 | * | |
38 | * ChangeLog: | |
39 | * 10-Mar-2005 | |
40 | * 10LE Instituto Nokia de Tecnologia - INdT: | |
41 | * A better way to walks through the page table as suggested by Hugh Dickins. | |
42 | * | |
43 | * Simo Piiroinen <simo.piiroinen@nokia.com>: | |
44 | * Smaps information related to shared, private, clean and dirty pages. | |
45 | * | |
46 | * Paul Mundt <paul.mundt@nokia.com>: | |
47 | * Overall revision about smaps. | |
1da177e4 LT |
48 | */ |
49 | ||
50 | #include <asm/uaccess.h> | |
51 | ||
1da177e4 LT |
52 | #include <linux/errno.h> |
53 | #include <linux/time.h> | |
54 | #include <linux/proc_fs.h> | |
55 | #include <linux/stat.h> | |
5995477a | 56 | #include <linux/task_io_accounting_ops.h> |
1da177e4 | 57 | #include <linux/init.h> |
16f7e0fe | 58 | #include <linux/capability.h> |
1da177e4 | 59 | #include <linux/file.h> |
9f3acc31 | 60 | #include <linux/fdtable.h> |
1da177e4 LT |
61 | #include <linux/string.h> |
62 | #include <linux/seq_file.h> | |
63 | #include <linux/namei.h> | |
6b3286ed | 64 | #include <linux/mnt_namespace.h> |
1da177e4 | 65 | #include <linux/mm.h> |
a63d83f4 | 66 | #include <linux/swap.h> |
b835996f | 67 | #include <linux/rcupdate.h> |
1da177e4 | 68 | #include <linux/kallsyms.h> |
2ec220e2 | 69 | #include <linux/stacktrace.h> |
d85f50d5 | 70 | #include <linux/resource.h> |
5096add8 | 71 | #include <linux/module.h> |
1da177e4 LT |
72 | #include <linux/mount.h> |
73 | #include <linux/security.h> | |
74 | #include <linux/ptrace.h> | |
0d094efe | 75 | #include <linux/tracehook.h> |
a424316c | 76 | #include <linux/cgroup.h> |
1da177e4 LT |
77 | #include <linux/cpuset.h> |
78 | #include <linux/audit.h> | |
5addc5dd | 79 | #include <linux/poll.h> |
1651e14e | 80 | #include <linux/nsproxy.h> |
8ac773b4 | 81 | #include <linux/oom.h> |
3cb4a0bb | 82 | #include <linux/elf.h> |
60347f67 | 83 | #include <linux/pid_namespace.h> |
5ad4e53b | 84 | #include <linux/fs_struct.h> |
5a0e3ad6 | 85 | #include <linux/slab.h> |
640708a2 | 86 | #include <linux/flex_array.h> |
f133ecca CM |
87 | #ifdef CONFIG_HARDWALL |
88 | #include <asm/hardwall.h> | |
89 | #endif | |
43d2b113 | 90 | #include <trace/events/oom.h> |
1da177e4 LT |
91 | #include "internal.h" |
92 | ||
0f2fe20f EB |
93 | /* NOTE: |
94 | * Implementing inode permission operations in /proc is almost | |
95 | * certainly an error. Permission checks need to happen during | |
96 | * each system call not at open time. The reason is that most of | |
97 | * what we wish to check for permissions in /proc varies at runtime. | |
98 | * | |
99 | * The classic example of a problem is opening file descriptors | |
100 | * in /proc for a task before it execs a suid executable. | |
101 | */ | |
102 | ||
1da177e4 | 103 | struct pid_entry { |
1da177e4 | 104 | char *name; |
c5141e6d | 105 | int len; |
d161a13f | 106 | umode_t mode; |
c5ef1c42 | 107 | const struct inode_operations *iop; |
00977a59 | 108 | const struct file_operations *fop; |
20cdc894 | 109 | union proc_op op; |
1da177e4 LT |
110 | }; |
111 | ||
61a28784 | 112 | #define NOD(NAME, MODE, IOP, FOP, OP) { \ |
20cdc894 | 113 | .name = (NAME), \ |
c5141e6d | 114 | .len = sizeof(NAME) - 1, \ |
20cdc894 EB |
115 | .mode = MODE, \ |
116 | .iop = IOP, \ | |
117 | .fop = FOP, \ | |
118 | .op = OP, \ | |
119 | } | |
120 | ||
631f9c18 AD |
121 | #define DIR(NAME, MODE, iops, fops) \ |
122 | NOD(NAME, (S_IFDIR|(MODE)), &iops, &fops, {} ) | |
123 | #define LNK(NAME, get_link) \ | |
61a28784 | 124 | NOD(NAME, (S_IFLNK|S_IRWXUGO), \ |
20cdc894 | 125 | &proc_pid_link_inode_operations, NULL, \ |
631f9c18 AD |
126 | { .proc_get_link = get_link } ) |
127 | #define REG(NAME, MODE, fops) \ | |
128 | NOD(NAME, (S_IFREG|(MODE)), NULL, &fops, {}) | |
129 | #define INF(NAME, MODE, read) \ | |
61a28784 | 130 | NOD(NAME, (S_IFREG|(MODE)), \ |
20cdc894 | 131 | NULL, &proc_info_file_operations, \ |
631f9c18 AD |
132 | { .proc_read = read } ) |
133 | #define ONE(NAME, MODE, show) \ | |
be614086 EB |
134 | NOD(NAME, (S_IFREG|(MODE)), \ |
135 | NULL, &proc_single_file_operations, \ | |
631f9c18 | 136 | { .proc_show = show } ) |
1da177e4 | 137 | |
640708a2 PE |
138 | static int proc_fd_permission(struct inode *inode, int mask); |
139 | ||
aed54175 VN |
140 | /* |
141 | * Count the number of hardlinks for the pid_entry table, excluding the . | |
142 | * and .. links. | |
143 | */ | |
144 | static unsigned int pid_entry_count_dirs(const struct pid_entry *entries, | |
145 | unsigned int n) | |
146 | { | |
147 | unsigned int i; | |
148 | unsigned int count; | |
149 | ||
150 | count = 0; | |
151 | for (i = 0; i < n; ++i) { | |
152 | if (S_ISDIR(entries[i].mode)) | |
153 | ++count; | |
154 | } | |
155 | ||
156 | return count; | |
157 | } | |
158 | ||
f7ad3c6b | 159 | static int get_task_root(struct task_struct *task, struct path *root) |
1da177e4 | 160 | { |
7c2c7d99 HD |
161 | int result = -ENOENT; |
162 | ||
0494f6ec | 163 | task_lock(task); |
f7ad3c6b MS |
164 | if (task->fs) { |
165 | get_fs_root(task->fs, root); | |
7c2c7d99 HD |
166 | result = 0; |
167 | } | |
0494f6ec | 168 | task_unlock(task); |
7c2c7d99 | 169 | return result; |
0494f6ec MS |
170 | } |
171 | ||
7773fbc5 | 172 | static int proc_cwd_link(struct dentry *dentry, struct path *path) |
0494f6ec | 173 | { |
7773fbc5 | 174 | struct task_struct *task = get_proc_task(dentry->d_inode); |
0494f6ec | 175 | int result = -ENOENT; |
99f89551 EB |
176 | |
177 | if (task) { | |
f7ad3c6b MS |
178 | task_lock(task); |
179 | if (task->fs) { | |
180 | get_fs_pwd(task->fs, path); | |
181 | result = 0; | |
182 | } | |
183 | task_unlock(task); | |
99f89551 EB |
184 | put_task_struct(task); |
185 | } | |
1da177e4 LT |
186 | return result; |
187 | } | |
188 | ||
7773fbc5 | 189 | static int proc_root_link(struct dentry *dentry, struct path *path) |
1da177e4 | 190 | { |
7773fbc5 | 191 | struct task_struct *task = get_proc_task(dentry->d_inode); |
1da177e4 | 192 | int result = -ENOENT; |
99f89551 EB |
193 | |
194 | if (task) { | |
f7ad3c6b | 195 | result = get_task_root(task, path); |
99f89551 EB |
196 | put_task_struct(task); |
197 | } | |
1da177e4 LT |
198 | return result; |
199 | } | |
200 | ||
e268337d | 201 | static struct mm_struct *mm_access(struct task_struct *task, unsigned int mode) |
831830b5 | 202 | { |
704b836c | 203 | struct mm_struct *mm; |
ec6fd8a4 | 204 | int err; |
704b836c | 205 | |
ec6fd8a4 AV |
206 | err = mutex_lock_killable(&task->signal->cred_guard_mutex); |
207 | if (err) | |
208 | return ERR_PTR(err); | |
00f89d21 | 209 | |
704b836c ON |
210 | mm = get_task_mm(task); |
211 | if (mm && mm != current->mm && | |
e268337d | 212 | !ptrace_may_access(task, mode)) { |
704b836c | 213 | mmput(mm); |
ec6fd8a4 | 214 | mm = ERR_PTR(-EACCES); |
13f0feaf | 215 | } |
9b1bf12d | 216 | mutex_unlock(&task->signal->cred_guard_mutex); |
704b836c | 217 | |
831830b5 | 218 | return mm; |
831830b5 AV |
219 | } |
220 | ||
e268337d LT |
221 | struct mm_struct *mm_for_maps(struct task_struct *task) |
222 | { | |
223 | return mm_access(task, PTRACE_MODE_READ); | |
224 | } | |
225 | ||
1da177e4 LT |
226 | static int proc_pid_cmdline(struct task_struct *task, char * buffer) |
227 | { | |
228 | int res = 0; | |
229 | unsigned int len; | |
230 | struct mm_struct *mm = get_task_mm(task); | |
231 | if (!mm) | |
232 | goto out; | |
233 | if (!mm->arg_end) | |
234 | goto out_mm; /* Shh! No looking before we're done */ | |
235 | ||
236 | len = mm->arg_end - mm->arg_start; | |
237 | ||
238 | if (len > PAGE_SIZE) | |
239 | len = PAGE_SIZE; | |
240 | ||
241 | res = access_process_vm(task, mm->arg_start, buffer, len, 0); | |
242 | ||
243 | // If the nul at the end of args has been overwritten, then | |
244 | // assume application is using setproctitle(3). | |
245 | if (res > 0 && buffer[res-1] != '\0' && len < PAGE_SIZE) { | |
246 | len = strnlen(buffer, res); | |
247 | if (len < res) { | |
248 | res = len; | |
249 | } else { | |
250 | len = mm->env_end - mm->env_start; | |
251 | if (len > PAGE_SIZE - res) | |
252 | len = PAGE_SIZE - res; | |
253 | res += access_process_vm(task, mm->env_start, buffer+res, len, 0); | |
254 | res = strnlen(buffer, res); | |
255 | } | |
256 | } | |
257 | out_mm: | |
258 | mmput(mm); | |
259 | out: | |
260 | return res; | |
261 | } | |
262 | ||
263 | static int proc_pid_auxv(struct task_struct *task, char *buffer) | |
264 | { | |
2fadaef4 AV |
265 | struct mm_struct *mm = mm_for_maps(task); |
266 | int res = PTR_ERR(mm); | |
267 | if (mm && !IS_ERR(mm)) { | |
1da177e4 | 268 | unsigned int nwords = 0; |
dfe6b7d9 | 269 | do { |
1da177e4 | 270 | nwords += 2; |
dfe6b7d9 | 271 | } while (mm->saved_auxv[nwords - 2] != 0); /* AT_NULL */ |
1da177e4 LT |
272 | res = nwords * sizeof(mm->saved_auxv[0]); |
273 | if (res > PAGE_SIZE) | |
274 | res = PAGE_SIZE; | |
275 | memcpy(buffer, mm->saved_auxv, res); | |
276 | mmput(mm); | |
277 | } | |
278 | return res; | |
279 | } | |
280 | ||
281 | ||
282 | #ifdef CONFIG_KALLSYMS | |
283 | /* | |
284 | * Provides a wchan file via kallsyms in a proper one-value-per-file format. | |
285 | * Returns the resolved symbol. If that fails, simply return the address. | |
286 | */ | |
287 | static int proc_pid_wchan(struct task_struct *task, char *buffer) | |
288 | { | |
ffb45122 | 289 | unsigned long wchan; |
9281acea | 290 | char symname[KSYM_NAME_LEN]; |
1da177e4 LT |
291 | |
292 | wchan = get_wchan(task); | |
293 | ||
9d65cb4a | 294 | if (lookup_symbol_name(wchan, symname) < 0) |
f83ce3e6 JE |
295 | if (!ptrace_may_access(task, PTRACE_MODE_READ)) |
296 | return 0; | |
297 | else | |
298 | return sprintf(buffer, "%lu", wchan); | |
9d65cb4a AD |
299 | else |
300 | return sprintf(buffer, "%s", symname); | |
1da177e4 LT |
301 | } |
302 | #endif /* CONFIG_KALLSYMS */ | |
303 | ||
a9712bc1 AV |
304 | static int lock_trace(struct task_struct *task) |
305 | { | |
306 | int err = mutex_lock_killable(&task->signal->cred_guard_mutex); | |
307 | if (err) | |
308 | return err; | |
309 | if (!ptrace_may_access(task, PTRACE_MODE_ATTACH)) { | |
310 | mutex_unlock(&task->signal->cred_guard_mutex); | |
311 | return -EPERM; | |
312 | } | |
313 | return 0; | |
314 | } | |
315 | ||
316 | static void unlock_trace(struct task_struct *task) | |
317 | { | |
318 | mutex_unlock(&task->signal->cred_guard_mutex); | |
319 | } | |
320 | ||
2ec220e2 KC |
321 | #ifdef CONFIG_STACKTRACE |
322 | ||
323 | #define MAX_STACK_TRACE_DEPTH 64 | |
324 | ||
325 | static int proc_pid_stack(struct seq_file *m, struct pid_namespace *ns, | |
326 | struct pid *pid, struct task_struct *task) | |
327 | { | |
328 | struct stack_trace trace; | |
329 | unsigned long *entries; | |
a9712bc1 | 330 | int err; |
2ec220e2 KC |
331 | int i; |
332 | ||
333 | entries = kmalloc(MAX_STACK_TRACE_DEPTH * sizeof(*entries), GFP_KERNEL); | |
334 | if (!entries) | |
335 | return -ENOMEM; | |
336 | ||
337 | trace.nr_entries = 0; | |
338 | trace.max_entries = MAX_STACK_TRACE_DEPTH; | |
339 | trace.entries = entries; | |
340 | trace.skip = 0; | |
2ec220e2 | 341 | |
a9712bc1 AV |
342 | err = lock_trace(task); |
343 | if (!err) { | |
344 | save_stack_trace_tsk(task, &trace); | |
345 | ||
346 | for (i = 0; i < trace.nr_entries; i++) { | |
b81a618d | 347 | seq_printf(m, "[<%pK>] %pS\n", |
a9712bc1 AV |
348 | (void *)entries[i], (void *)entries[i]); |
349 | } | |
350 | unlock_trace(task); | |
2ec220e2 KC |
351 | } |
352 | kfree(entries); | |
353 | ||
a9712bc1 | 354 | return err; |
2ec220e2 KC |
355 | } |
356 | #endif | |
357 | ||
1da177e4 LT |
358 | #ifdef CONFIG_SCHEDSTATS |
359 | /* | |
360 | * Provides /proc/PID/schedstat | |
361 | */ | |
362 | static int proc_pid_schedstat(struct task_struct *task, char *buffer) | |
363 | { | |
172ba844 | 364 | return sprintf(buffer, "%llu %llu %lu\n", |
826e08b0 IM |
365 | (unsigned long long)task->se.sum_exec_runtime, |
366 | (unsigned long long)task->sched_info.run_delay, | |
2d72376b | 367 | task->sched_info.pcount); |
1da177e4 LT |
368 | } |
369 | #endif | |
370 | ||
9745512c AV |
371 | #ifdef CONFIG_LATENCYTOP |
372 | static int lstats_show_proc(struct seq_file *m, void *v) | |
373 | { | |
374 | int i; | |
13d77c37 HS |
375 | struct inode *inode = m->private; |
376 | struct task_struct *task = get_proc_task(inode); | |
9745512c | 377 | |
13d77c37 HS |
378 | if (!task) |
379 | return -ESRCH; | |
380 | seq_puts(m, "Latency Top version : v0.1\n"); | |
9745512c | 381 | for (i = 0; i < 32; i++) { |
34e49d4f JP |
382 | struct latency_record *lr = &task->latency_record[i]; |
383 | if (lr->backtrace[0]) { | |
9745512c | 384 | int q; |
34e49d4f JP |
385 | seq_printf(m, "%i %li %li", |
386 | lr->count, lr->time, lr->max); | |
9745512c | 387 | for (q = 0; q < LT_BACKTRACEDEPTH; q++) { |
34e49d4f JP |
388 | unsigned long bt = lr->backtrace[q]; |
389 | if (!bt) | |
9745512c | 390 | break; |
34e49d4f | 391 | if (bt == ULONG_MAX) |
9745512c | 392 | break; |
34e49d4f | 393 | seq_printf(m, " %ps", (void *)bt); |
9745512c | 394 | } |
9d6de12f | 395 | seq_putc(m, '\n'); |
9745512c AV |
396 | } |
397 | ||
398 | } | |
13d77c37 | 399 | put_task_struct(task); |
9745512c AV |
400 | return 0; |
401 | } | |
402 | ||
403 | static int lstats_open(struct inode *inode, struct file *file) | |
404 | { | |
13d77c37 | 405 | return single_open(file, lstats_show_proc, inode); |
d6643d12 HS |
406 | } |
407 | ||
9745512c AV |
408 | static ssize_t lstats_write(struct file *file, const char __user *buf, |
409 | size_t count, loff_t *offs) | |
410 | { | |
13d77c37 | 411 | struct task_struct *task = get_proc_task(file->f_dentry->d_inode); |
9745512c | 412 | |
13d77c37 HS |
413 | if (!task) |
414 | return -ESRCH; | |
9745512c | 415 | clear_all_latency_tracing(task); |
13d77c37 | 416 | put_task_struct(task); |
9745512c AV |
417 | |
418 | return count; | |
419 | } | |
420 | ||
421 | static const struct file_operations proc_lstats_operations = { | |
422 | .open = lstats_open, | |
423 | .read = seq_read, | |
424 | .write = lstats_write, | |
425 | .llseek = seq_lseek, | |
13d77c37 | 426 | .release = single_release, |
9745512c AV |
427 | }; |
428 | ||
429 | #endif | |
430 | ||
1da177e4 LT |
431 | static int proc_oom_score(struct task_struct *task, char *buffer) |
432 | { | |
b95c35e7 | 433 | unsigned long points = 0; |
1da177e4 | 434 | |
19c5d45a | 435 | read_lock(&tasklist_lock); |
b95c35e7 | 436 | if (pid_alive(task)) |
a63d83f4 DR |
437 | points = oom_badness(task, NULL, NULL, |
438 | totalram_pages + total_swap_pages); | |
19c5d45a | 439 | read_unlock(&tasklist_lock); |
1da177e4 LT |
440 | return sprintf(buffer, "%lu\n", points); |
441 | } | |
442 | ||
d85f50d5 NH |
443 | struct limit_names { |
444 | char *name; | |
445 | char *unit; | |
446 | }; | |
447 | ||
448 | static const struct limit_names lnames[RLIM_NLIMITS] = { | |
cff4edb5 | 449 | [RLIMIT_CPU] = {"Max cpu time", "seconds"}, |
d85f50d5 NH |
450 | [RLIMIT_FSIZE] = {"Max file size", "bytes"}, |
451 | [RLIMIT_DATA] = {"Max data size", "bytes"}, | |
452 | [RLIMIT_STACK] = {"Max stack size", "bytes"}, | |
453 | [RLIMIT_CORE] = {"Max core file size", "bytes"}, | |
454 | [RLIMIT_RSS] = {"Max resident set", "bytes"}, | |
455 | [RLIMIT_NPROC] = {"Max processes", "processes"}, | |
456 | [RLIMIT_NOFILE] = {"Max open files", "files"}, | |
457 | [RLIMIT_MEMLOCK] = {"Max locked memory", "bytes"}, | |
458 | [RLIMIT_AS] = {"Max address space", "bytes"}, | |
459 | [RLIMIT_LOCKS] = {"Max file locks", "locks"}, | |
460 | [RLIMIT_SIGPENDING] = {"Max pending signals", "signals"}, | |
461 | [RLIMIT_MSGQUEUE] = {"Max msgqueue size", "bytes"}, | |
462 | [RLIMIT_NICE] = {"Max nice priority", NULL}, | |
463 | [RLIMIT_RTPRIO] = {"Max realtime priority", NULL}, | |
8808117c | 464 | [RLIMIT_RTTIME] = {"Max realtime timeout", "us"}, |
d85f50d5 NH |
465 | }; |
466 | ||
467 | /* Display limits for a process */ | |
468 | static int proc_pid_limits(struct task_struct *task, char *buffer) | |
469 | { | |
470 | unsigned int i; | |
471 | int count = 0; | |
472 | unsigned long flags; | |
473 | char *bufptr = buffer; | |
474 | ||
475 | struct rlimit rlim[RLIM_NLIMITS]; | |
476 | ||
a6bebbc8 | 477 | if (!lock_task_sighand(task, &flags)) |
d85f50d5 | 478 | return 0; |
d85f50d5 NH |
479 | memcpy(rlim, task->signal->rlim, sizeof(struct rlimit) * RLIM_NLIMITS); |
480 | unlock_task_sighand(task, &flags); | |
d85f50d5 NH |
481 | |
482 | /* | |
483 | * print the file header | |
484 | */ | |
485 | count += sprintf(&bufptr[count], "%-25s %-20s %-20s %-10s\n", | |
486 | "Limit", "Soft Limit", "Hard Limit", "Units"); | |
487 | ||
488 | for (i = 0; i < RLIM_NLIMITS; i++) { | |
489 | if (rlim[i].rlim_cur == RLIM_INFINITY) | |
490 | count += sprintf(&bufptr[count], "%-25s %-20s ", | |
491 | lnames[i].name, "unlimited"); | |
492 | else | |
493 | count += sprintf(&bufptr[count], "%-25s %-20lu ", | |
494 | lnames[i].name, rlim[i].rlim_cur); | |
495 | ||
496 | if (rlim[i].rlim_max == RLIM_INFINITY) | |
497 | count += sprintf(&bufptr[count], "%-20s ", "unlimited"); | |
498 | else | |
499 | count += sprintf(&bufptr[count], "%-20lu ", | |
500 | rlim[i].rlim_max); | |
501 | ||
502 | if (lnames[i].unit) | |
503 | count += sprintf(&bufptr[count], "%-10s\n", | |
504 | lnames[i].unit); | |
505 | else | |
506 | count += sprintf(&bufptr[count], "\n"); | |
507 | } | |
508 | ||
509 | return count; | |
510 | } | |
511 | ||
ebcb6734 RM |
512 | #ifdef CONFIG_HAVE_ARCH_TRACEHOOK |
513 | static int proc_pid_syscall(struct task_struct *task, char *buffer) | |
514 | { | |
515 | long nr; | |
516 | unsigned long args[6], sp, pc; | |
a9712bc1 AV |
517 | int res = lock_trace(task); |
518 | if (res) | |
519 | return res; | |
ebcb6734 RM |
520 | |
521 | if (task_current_syscall(task, &nr, args, 6, &sp, &pc)) | |
a9712bc1 AV |
522 | res = sprintf(buffer, "running\n"); |
523 | else if (nr < 0) | |
524 | res = sprintf(buffer, "%ld 0x%lx 0x%lx\n", nr, sp, pc); | |
525 | else | |
526 | res = sprintf(buffer, | |
ebcb6734 RM |
527 | "%ld 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx\n", |
528 | nr, | |
529 | args[0], args[1], args[2], args[3], args[4], args[5], | |
530 | sp, pc); | |
a9712bc1 AV |
531 | unlock_trace(task); |
532 | return res; | |
ebcb6734 RM |
533 | } |
534 | #endif /* CONFIG_HAVE_ARCH_TRACEHOOK */ | |
535 | ||
1da177e4 LT |
536 | /************************************************************************/ |
537 | /* Here the fs part begins */ | |
538 | /************************************************************************/ | |
539 | ||
540 | /* permission checks */ | |
778c1144 | 541 | static int proc_fd_access_allowed(struct inode *inode) |
1da177e4 | 542 | { |
778c1144 EB |
543 | struct task_struct *task; |
544 | int allowed = 0; | |
df26c40e EB |
545 | /* Allow access to a task's file descriptors if it is us or we |
546 | * may use ptrace attach to the process and find out that | |
547 | * information. | |
778c1144 EB |
548 | */ |
549 | task = get_proc_task(inode); | |
df26c40e | 550 | if (task) { |
006ebb40 | 551 | allowed = ptrace_may_access(task, PTRACE_MODE_READ); |
778c1144 | 552 | put_task_struct(task); |
df26c40e | 553 | } |
778c1144 | 554 | return allowed; |
1da177e4 LT |
555 | } |
556 | ||
6b4e306a | 557 | int proc_setattr(struct dentry *dentry, struct iattr *attr) |
6d76fa58 LT |
558 | { |
559 | int error; | |
560 | struct inode *inode = dentry->d_inode; | |
561 | ||
562 | if (attr->ia_valid & ATTR_MODE) | |
563 | return -EPERM; | |
564 | ||
565 | error = inode_change_ok(inode, attr); | |
1025774c CH |
566 | if (error) |
567 | return error; | |
568 | ||
569 | if ((attr->ia_valid & ATTR_SIZE) && | |
570 | attr->ia_size != i_size_read(inode)) { | |
571 | error = vmtruncate(inode, attr->ia_size); | |
572 | if (error) | |
573 | return error; | |
574 | } | |
575 | ||
576 | setattr_copy(inode, attr); | |
577 | mark_inode_dirty(inode); | |
578 | return 0; | |
6d76fa58 LT |
579 | } |
580 | ||
0499680a VK |
581 | /* |
582 | * May current process learn task's sched/cmdline info (for hide_pid_min=1) | |
583 | * or euid/egid (for hide_pid_min=2)? | |
584 | */ | |
585 | static bool has_pid_permissions(struct pid_namespace *pid, | |
586 | struct task_struct *task, | |
587 | int hide_pid_min) | |
588 | { | |
589 | if (pid->hide_pid < hide_pid_min) | |
590 | return true; | |
591 | if (in_group_p(pid->pid_gid)) | |
592 | return true; | |
593 | return ptrace_may_access(task, PTRACE_MODE_READ); | |
594 | } | |
595 | ||
596 | ||
597 | static int proc_pid_permission(struct inode *inode, int mask) | |
598 | { | |
599 | struct pid_namespace *pid = inode->i_sb->s_fs_info; | |
600 | struct task_struct *task; | |
601 | bool has_perms; | |
602 | ||
603 | task = get_proc_task(inode); | |
a2ef990a XF |
604 | if (!task) |
605 | return -ESRCH; | |
0499680a VK |
606 | has_perms = has_pid_permissions(pid, task, 1); |
607 | put_task_struct(task); | |
608 | ||
609 | if (!has_perms) { | |
610 | if (pid->hide_pid == 2) { | |
611 | /* | |
612 | * Let's make getdents(), stat(), and open() | |
613 | * consistent with each other. If a process | |
614 | * may not stat() a file, it shouldn't be seen | |
615 | * in procfs at all. | |
616 | */ | |
617 | return -ENOENT; | |
618 | } | |
619 | ||
620 | return -EPERM; | |
621 | } | |
622 | return generic_permission(inode, mask); | |
623 | } | |
624 | ||
625 | ||
626 | ||
c5ef1c42 | 627 | static const struct inode_operations proc_def_inode_operations = { |
6d76fa58 LT |
628 | .setattr = proc_setattr, |
629 | }; | |
630 | ||
1da177e4 LT |
631 | #define PROC_BLOCK_SIZE (3*1024) /* 4K page size but our output routines use some slack for overruns */ |
632 | ||
633 | static ssize_t proc_info_read(struct file * file, char __user * buf, | |
634 | size_t count, loff_t *ppos) | |
635 | { | |
2fddfeef | 636 | struct inode * inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
637 | unsigned long page; |
638 | ssize_t length; | |
99f89551 EB |
639 | struct task_struct *task = get_proc_task(inode); |
640 | ||
641 | length = -ESRCH; | |
642 | if (!task) | |
643 | goto out_no_task; | |
1da177e4 LT |
644 | |
645 | if (count > PROC_BLOCK_SIZE) | |
646 | count = PROC_BLOCK_SIZE; | |
99f89551 EB |
647 | |
648 | length = -ENOMEM; | |
e12ba74d | 649 | if (!(page = __get_free_page(GFP_TEMPORARY))) |
99f89551 | 650 | goto out; |
1da177e4 LT |
651 | |
652 | length = PROC_I(inode)->op.proc_read(task, (char*)page); | |
653 | ||
654 | if (length >= 0) | |
655 | length = simple_read_from_buffer(buf, count, ppos, (char *)page, length); | |
656 | free_page(page); | |
99f89551 EB |
657 | out: |
658 | put_task_struct(task); | |
659 | out_no_task: | |
1da177e4 LT |
660 | return length; |
661 | } | |
662 | ||
00977a59 | 663 | static const struct file_operations proc_info_file_operations = { |
1da177e4 | 664 | .read = proc_info_read, |
87df8424 | 665 | .llseek = generic_file_llseek, |
1da177e4 LT |
666 | }; |
667 | ||
be614086 EB |
668 | static int proc_single_show(struct seq_file *m, void *v) |
669 | { | |
670 | struct inode *inode = m->private; | |
671 | struct pid_namespace *ns; | |
672 | struct pid *pid; | |
673 | struct task_struct *task; | |
674 | int ret; | |
675 | ||
676 | ns = inode->i_sb->s_fs_info; | |
677 | pid = proc_pid(inode); | |
678 | task = get_pid_task(pid, PIDTYPE_PID); | |
679 | if (!task) | |
680 | return -ESRCH; | |
681 | ||
682 | ret = PROC_I(inode)->op.proc_show(m, ns, pid, task); | |
683 | ||
684 | put_task_struct(task); | |
685 | return ret; | |
686 | } | |
687 | ||
688 | static int proc_single_open(struct inode *inode, struct file *filp) | |
689 | { | |
c6a34058 | 690 | return single_open(filp, proc_single_show, inode); |
be614086 EB |
691 | } |
692 | ||
693 | static const struct file_operations proc_single_file_operations = { | |
694 | .open = proc_single_open, | |
695 | .read = seq_read, | |
696 | .llseek = seq_lseek, | |
697 | .release = single_release, | |
698 | }; | |
699 | ||
1da177e4 LT |
700 | static int mem_open(struct inode* inode, struct file* file) |
701 | { | |
e268337d LT |
702 | struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode); |
703 | struct mm_struct *mm; | |
704 | ||
705 | if (!task) | |
706 | return -ESRCH; | |
707 | ||
708 | mm = mm_access(task, PTRACE_MODE_ATTACH); | |
709 | put_task_struct(task); | |
710 | ||
711 | if (IS_ERR(mm)) | |
712 | return PTR_ERR(mm); | |
713 | ||
4a3956c7 KH |
714 | /* OK to pass negative loff_t, we can catch out-of-range */ |
715 | file->f_mode |= FMODE_UNSIGNED_OFFSET; | |
e268337d LT |
716 | file->private_data = mm; |
717 | ||
1da177e4 LT |
718 | return 0; |
719 | } | |
720 | ||
721 | static ssize_t mem_read(struct file * file, char __user * buf, | |
722 | size_t count, loff_t *ppos) | |
723 | { | |
e268337d | 724 | int ret; |
1da177e4 LT |
725 | char *page; |
726 | unsigned long src = *ppos; | |
e268337d | 727 | struct mm_struct *mm = file->private_data; |
1da177e4 | 728 | |
e268337d LT |
729 | if (!mm) |
730 | return 0; | |
99f89551 | 731 | |
e12ba74d | 732 | page = (char *)__get_free_page(GFP_TEMPORARY); |
1da177e4 | 733 | if (!page) |
e268337d | 734 | return -ENOMEM; |
1da177e4 LT |
735 | |
736 | ret = 0; | |
737 | ||
738 | while (count > 0) { | |
739 | int this_len, retval; | |
740 | ||
741 | this_len = (count > PAGE_SIZE) ? PAGE_SIZE : count; | |
8b0db9db SW |
742 | retval = access_remote_vm(mm, src, page, this_len, 0); |
743 | if (!retval) { | |
1da177e4 LT |
744 | if (!ret) |
745 | ret = -EIO; | |
746 | break; | |
747 | } | |
748 | ||
749 | if (copy_to_user(buf, page, retval)) { | |
750 | ret = -EFAULT; | |
751 | break; | |
752 | } | |
753 | ||
754 | ret += retval; | |
755 | src += retval; | |
756 | buf += retval; | |
757 | count -= retval; | |
758 | } | |
759 | *ppos = src; | |
760 | ||
1da177e4 | 761 | free_page((unsigned long) page); |
1da177e4 LT |
762 | return ret; |
763 | } | |
764 | ||
63967fa9 | 765 | static ssize_t mem_write(struct file * file, const char __user *buf, |
1da177e4 LT |
766 | size_t count, loff_t *ppos) |
767 | { | |
f7ca54f4 | 768 | int copied; |
1da177e4 | 769 | char *page; |
1da177e4 | 770 | unsigned long dst = *ppos; |
e268337d | 771 | struct mm_struct *mm = file->private_data; |
1da177e4 | 772 | |
e268337d LT |
773 | if (!mm) |
774 | return 0; | |
99f89551 | 775 | |
30cd8903 KM |
776 | page = (char *)__get_free_page(GFP_TEMPORARY); |
777 | if (!page) | |
e268337d | 778 | return -ENOMEM; |
1da177e4 | 779 | |
f7ca54f4 | 780 | copied = 0; |
1da177e4 LT |
781 | while (count > 0) { |
782 | int this_len, retval; | |
783 | ||
784 | this_len = (count > PAGE_SIZE) ? PAGE_SIZE : count; | |
785 | if (copy_from_user(page, buf, this_len)) { | |
786 | copied = -EFAULT; | |
787 | break; | |
788 | } | |
8b0db9db | 789 | retval = access_remote_vm(mm, dst, page, this_len, 1); |
1da177e4 LT |
790 | if (!retval) { |
791 | if (!copied) | |
792 | copied = -EIO; | |
793 | break; | |
794 | } | |
795 | copied += retval; | |
796 | buf += retval; | |
797 | dst += retval; | |
798 | count -= retval; | |
799 | } | |
800 | *ppos = dst; | |
30cd8903 | 801 | |
30cd8903 | 802 | free_page((unsigned long) page); |
1da177e4 LT |
803 | return copied; |
804 | } | |
1da177e4 | 805 | |
85863e47 | 806 | loff_t mem_lseek(struct file *file, loff_t offset, int orig) |
1da177e4 LT |
807 | { |
808 | switch (orig) { | |
809 | case 0: | |
810 | file->f_pos = offset; | |
811 | break; | |
812 | case 1: | |
813 | file->f_pos += offset; | |
814 | break; | |
815 | default: | |
816 | return -EINVAL; | |
817 | } | |
818 | force_successful_syscall_return(); | |
819 | return file->f_pos; | |
820 | } | |
821 | ||
e268337d LT |
822 | static int mem_release(struct inode *inode, struct file *file) |
823 | { | |
824 | struct mm_struct *mm = file->private_data; | |
71879d3c ON |
825 | if (mm) |
826 | mmput(mm); | |
e268337d LT |
827 | return 0; |
828 | } | |
829 | ||
00977a59 | 830 | static const struct file_operations proc_mem_operations = { |
1da177e4 LT |
831 | .llseek = mem_lseek, |
832 | .read = mem_read, | |
833 | .write = mem_write, | |
834 | .open = mem_open, | |
e268337d | 835 | .release = mem_release, |
1da177e4 LT |
836 | }; |
837 | ||
315e28c8 JP |
838 | static ssize_t environ_read(struct file *file, char __user *buf, |
839 | size_t count, loff_t *ppos) | |
840 | { | |
841 | struct task_struct *task = get_proc_task(file->f_dentry->d_inode); | |
842 | char *page; | |
843 | unsigned long src = *ppos; | |
844 | int ret = -ESRCH; | |
845 | struct mm_struct *mm; | |
846 | ||
847 | if (!task) | |
848 | goto out_no_task; | |
849 | ||
315e28c8 JP |
850 | ret = -ENOMEM; |
851 | page = (char *)__get_free_page(GFP_TEMPORARY); | |
852 | if (!page) | |
853 | goto out; | |
854 | ||
315e28c8 | 855 | |
d6f64b89 AV |
856 | mm = mm_for_maps(task); |
857 | ret = PTR_ERR(mm); | |
858 | if (!mm || IS_ERR(mm)) | |
315e28c8 JP |
859 | goto out_free; |
860 | ||
d6f64b89 | 861 | ret = 0; |
315e28c8 JP |
862 | while (count > 0) { |
863 | int this_len, retval, max_len; | |
864 | ||
865 | this_len = mm->env_end - (mm->env_start + src); | |
866 | ||
867 | if (this_len <= 0) | |
868 | break; | |
869 | ||
870 | max_len = (count > PAGE_SIZE) ? PAGE_SIZE : count; | |
871 | this_len = (this_len > max_len) ? max_len : this_len; | |
872 | ||
873 | retval = access_process_vm(task, (mm->env_start + src), | |
874 | page, this_len, 0); | |
875 | ||
876 | if (retval <= 0) { | |
877 | ret = retval; | |
878 | break; | |
879 | } | |
880 | ||
881 | if (copy_to_user(buf, page, retval)) { | |
882 | ret = -EFAULT; | |
883 | break; | |
884 | } | |
885 | ||
886 | ret += retval; | |
887 | src += retval; | |
888 | buf += retval; | |
889 | count -= retval; | |
890 | } | |
891 | *ppos = src; | |
892 | ||
893 | mmput(mm); | |
894 | out_free: | |
895 | free_page((unsigned long) page); | |
896 | out: | |
897 | put_task_struct(task); | |
898 | out_no_task: | |
899 | return ret; | |
900 | } | |
901 | ||
902 | static const struct file_operations proc_environ_operations = { | |
903 | .read = environ_read, | |
87df8424 | 904 | .llseek = generic_file_llseek, |
315e28c8 JP |
905 | }; |
906 | ||
1da177e4 LT |
907 | static ssize_t oom_adjust_read(struct file *file, char __user *buf, |
908 | size_t count, loff_t *ppos) | |
909 | { | |
2fddfeef | 910 | struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode); |
8578cea7 | 911 | char buffer[PROC_NUMBUF]; |
1da177e4 | 912 | size_t len; |
28b83c51 KM |
913 | int oom_adjust = OOM_DISABLE; |
914 | unsigned long flags; | |
1da177e4 | 915 | |
99f89551 EB |
916 | if (!task) |
917 | return -ESRCH; | |
28b83c51 KM |
918 | |
919 | if (lock_task_sighand(task, &flags)) { | |
920 | oom_adjust = task->signal->oom_adj; | |
921 | unlock_task_sighand(task, &flags); | |
922 | } | |
923 | ||
99f89551 EB |
924 | put_task_struct(task); |
925 | ||
8578cea7 | 926 | len = snprintf(buffer, sizeof(buffer), "%i\n", oom_adjust); |
0c28f287 AM |
927 | |
928 | return simple_read_from_buffer(buf, count, ppos, buffer, len); | |
1da177e4 LT |
929 | } |
930 | ||
931 | static ssize_t oom_adjust_write(struct file *file, const char __user *buf, | |
932 | size_t count, loff_t *ppos) | |
933 | { | |
99f89551 | 934 | struct task_struct *task; |
5d863b89 | 935 | char buffer[PROC_NUMBUF]; |
0a8cb8e3 | 936 | int oom_adjust; |
28b83c51 | 937 | unsigned long flags; |
5d863b89 | 938 | int err; |
1da177e4 | 939 | |
8578cea7 EB |
940 | memset(buffer, 0, sizeof(buffer)); |
941 | if (count > sizeof(buffer) - 1) | |
942 | count = sizeof(buffer) - 1; | |
723548bf DR |
943 | if (copy_from_user(buffer, buf, count)) { |
944 | err = -EFAULT; | |
945 | goto out; | |
946 | } | |
5d863b89 | 947 | |
0a8cb8e3 | 948 | err = kstrtoint(strstrip(buffer), 0, &oom_adjust); |
5d863b89 | 949 | if (err) |
723548bf | 950 | goto out; |
8ac773b4 | 951 | if ((oom_adjust < OOM_ADJUST_MIN || oom_adjust > OOM_ADJUST_MAX) && |
723548bf DR |
952 | oom_adjust != OOM_DISABLE) { |
953 | err = -EINVAL; | |
954 | goto out; | |
955 | } | |
5d863b89 | 956 | |
2fddfeef | 957 | task = get_proc_task(file->f_path.dentry->d_inode); |
723548bf DR |
958 | if (!task) { |
959 | err = -ESRCH; | |
960 | goto out; | |
961 | } | |
d19d5476 DR |
962 | |
963 | task_lock(task); | |
964 | if (!task->mm) { | |
965 | err = -EINVAL; | |
966 | goto err_task_lock; | |
967 | } | |
968 | ||
28b83c51 | 969 | if (!lock_task_sighand(task, &flags)) { |
723548bf | 970 | err = -ESRCH; |
d19d5476 | 971 | goto err_task_lock; |
28b83c51 KM |
972 | } |
973 | ||
974 | if (oom_adjust < task->signal->oom_adj && !capable(CAP_SYS_RESOURCE)) { | |
723548bf DR |
975 | err = -EACCES; |
976 | goto err_sighand; | |
8fb4fc68 | 977 | } |
28b83c51 | 978 | |
51b1bd2a DR |
979 | /* |
980 | * Warn that /proc/pid/oom_adj is deprecated, see | |
981 | * Documentation/feature-removal-schedule.txt. | |
982 | */ | |
c2142704 | 983 | printk_once(KERN_WARNING "%s (%d): /proc/%d/oom_adj is deprecated, please use /proc/%d/oom_score_adj instead.\n", |
be8f684d DR |
984 | current->comm, task_pid_nr(current), task_pid_nr(task), |
985 | task_pid_nr(task)); | |
28b83c51 | 986 | task->signal->oom_adj = oom_adjust; |
a63d83f4 DR |
987 | /* |
988 | * Scale /proc/pid/oom_score_adj appropriately ensuring that a maximum | |
989 | * value is always attainable. | |
990 | */ | |
991 | if (task->signal->oom_adj == OOM_ADJUST_MAX) | |
992 | task->signal->oom_score_adj = OOM_SCORE_ADJ_MAX; | |
993 | else | |
994 | task->signal->oom_score_adj = (oom_adjust * OOM_SCORE_ADJ_MAX) / | |
995 | -OOM_DISABLE; | |
43d2b113 | 996 | trace_oom_score_adj_update(task); |
723548bf | 997 | err_sighand: |
28b83c51 | 998 | unlock_task_sighand(task, &flags); |
d19d5476 DR |
999 | err_task_lock: |
1000 | task_unlock(task); | |
99f89551 | 1001 | put_task_struct(task); |
723548bf DR |
1002 | out: |
1003 | return err < 0 ? err : count; | |
1da177e4 LT |
1004 | } |
1005 | ||
00977a59 | 1006 | static const struct file_operations proc_oom_adjust_operations = { |
1da177e4 LT |
1007 | .read = oom_adjust_read, |
1008 | .write = oom_adjust_write, | |
87df8424 | 1009 | .llseek = generic_file_llseek, |
1da177e4 LT |
1010 | }; |
1011 | ||
a63d83f4 DR |
1012 | static ssize_t oom_score_adj_read(struct file *file, char __user *buf, |
1013 | size_t count, loff_t *ppos) | |
1014 | { | |
1015 | struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode); | |
1016 | char buffer[PROC_NUMBUF]; | |
1017 | int oom_score_adj = OOM_SCORE_ADJ_MIN; | |
1018 | unsigned long flags; | |
1019 | size_t len; | |
1020 | ||
1021 | if (!task) | |
1022 | return -ESRCH; | |
1023 | if (lock_task_sighand(task, &flags)) { | |
1024 | oom_score_adj = task->signal->oom_score_adj; | |
1025 | unlock_task_sighand(task, &flags); | |
1026 | } | |
1027 | put_task_struct(task); | |
1028 | len = snprintf(buffer, sizeof(buffer), "%d\n", oom_score_adj); | |
1029 | return simple_read_from_buffer(buf, count, ppos, buffer, len); | |
1030 | } | |
1031 | ||
1032 | static ssize_t oom_score_adj_write(struct file *file, const char __user *buf, | |
1033 | size_t count, loff_t *ppos) | |
1034 | { | |
1035 | struct task_struct *task; | |
1036 | char buffer[PROC_NUMBUF]; | |
1037 | unsigned long flags; | |
0a8cb8e3 | 1038 | int oom_score_adj; |
a63d83f4 DR |
1039 | int err; |
1040 | ||
1041 | memset(buffer, 0, sizeof(buffer)); | |
1042 | if (count > sizeof(buffer) - 1) | |
1043 | count = sizeof(buffer) - 1; | |
723548bf DR |
1044 | if (copy_from_user(buffer, buf, count)) { |
1045 | err = -EFAULT; | |
1046 | goto out; | |
1047 | } | |
a63d83f4 | 1048 | |
0a8cb8e3 | 1049 | err = kstrtoint(strstrip(buffer), 0, &oom_score_adj); |
a63d83f4 | 1050 | if (err) |
723548bf | 1051 | goto out; |
a63d83f4 | 1052 | if (oom_score_adj < OOM_SCORE_ADJ_MIN || |
723548bf DR |
1053 | oom_score_adj > OOM_SCORE_ADJ_MAX) { |
1054 | err = -EINVAL; | |
1055 | goto out; | |
1056 | } | |
a63d83f4 DR |
1057 | |
1058 | task = get_proc_task(file->f_path.dentry->d_inode); | |
723548bf DR |
1059 | if (!task) { |
1060 | err = -ESRCH; | |
1061 | goto out; | |
1062 | } | |
d19d5476 DR |
1063 | |
1064 | task_lock(task); | |
1065 | if (!task->mm) { | |
1066 | err = -EINVAL; | |
1067 | goto err_task_lock; | |
1068 | } | |
1069 | ||
a63d83f4 | 1070 | if (!lock_task_sighand(task, &flags)) { |
723548bf | 1071 | err = -ESRCH; |
d19d5476 | 1072 | goto err_task_lock; |
a63d83f4 | 1073 | } |
d19d5476 | 1074 | |
dabb16f6 | 1075 | if (oom_score_adj < task->signal->oom_score_adj_min && |
a63d83f4 | 1076 | !capable(CAP_SYS_RESOURCE)) { |
723548bf DR |
1077 | err = -EACCES; |
1078 | goto err_sighand; | |
a63d83f4 DR |
1079 | } |
1080 | ||
1081 | task->signal->oom_score_adj = oom_score_adj; | |
dabb16f6 MSB |
1082 | if (has_capability_noaudit(current, CAP_SYS_RESOURCE)) |
1083 | task->signal->oom_score_adj_min = oom_score_adj; | |
43d2b113 | 1084 | trace_oom_score_adj_update(task); |
a63d83f4 DR |
1085 | /* |
1086 | * Scale /proc/pid/oom_adj appropriately ensuring that OOM_DISABLE is | |
1087 | * always attainable. | |
1088 | */ | |
1089 | if (task->signal->oom_score_adj == OOM_SCORE_ADJ_MIN) | |
1090 | task->signal->oom_adj = OOM_DISABLE; | |
1091 | else | |
1092 | task->signal->oom_adj = (oom_score_adj * OOM_ADJUST_MAX) / | |
1093 | OOM_SCORE_ADJ_MAX; | |
723548bf | 1094 | err_sighand: |
a63d83f4 | 1095 | unlock_task_sighand(task, &flags); |
d19d5476 DR |
1096 | err_task_lock: |
1097 | task_unlock(task); | |
a63d83f4 | 1098 | put_task_struct(task); |
723548bf DR |
1099 | out: |
1100 | return err < 0 ? err : count; | |
a63d83f4 DR |
1101 | } |
1102 | ||
1103 | static const struct file_operations proc_oom_score_adj_operations = { | |
1104 | .read = oom_score_adj_read, | |
1105 | .write = oom_score_adj_write, | |
6038f373 | 1106 | .llseek = default_llseek, |
a63d83f4 DR |
1107 | }; |
1108 | ||
1da177e4 LT |
1109 | #ifdef CONFIG_AUDITSYSCALL |
1110 | #define TMPBUFLEN 21 | |
1111 | static ssize_t proc_loginuid_read(struct file * file, char __user * buf, | |
1112 | size_t count, loff_t *ppos) | |
1113 | { | |
2fddfeef | 1114 | struct inode * inode = file->f_path.dentry->d_inode; |
99f89551 | 1115 | struct task_struct *task = get_proc_task(inode); |
1da177e4 LT |
1116 | ssize_t length; |
1117 | char tmpbuf[TMPBUFLEN]; | |
1118 | ||
99f89551 EB |
1119 | if (!task) |
1120 | return -ESRCH; | |
1da177e4 | 1121 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", |
0c11b942 | 1122 | audit_get_loginuid(task)); |
99f89551 | 1123 | put_task_struct(task); |
1da177e4 LT |
1124 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); |
1125 | } | |
1126 | ||
1127 | static ssize_t proc_loginuid_write(struct file * file, const char __user * buf, | |
1128 | size_t count, loff_t *ppos) | |
1129 | { | |
2fddfeef | 1130 | struct inode * inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
1131 | char *page, *tmp; |
1132 | ssize_t length; | |
1da177e4 LT |
1133 | uid_t loginuid; |
1134 | ||
7dc52157 PM |
1135 | rcu_read_lock(); |
1136 | if (current != pid_task(proc_pid(inode), PIDTYPE_PID)) { | |
1137 | rcu_read_unlock(); | |
1da177e4 | 1138 | return -EPERM; |
7dc52157 PM |
1139 | } |
1140 | rcu_read_unlock(); | |
1da177e4 | 1141 | |
e0182909 AV |
1142 | if (count >= PAGE_SIZE) |
1143 | count = PAGE_SIZE - 1; | |
1da177e4 LT |
1144 | |
1145 | if (*ppos != 0) { | |
1146 | /* No partial writes. */ | |
1147 | return -EINVAL; | |
1148 | } | |
e12ba74d | 1149 | page = (char*)__get_free_page(GFP_TEMPORARY); |
1da177e4 LT |
1150 | if (!page) |
1151 | return -ENOMEM; | |
1152 | length = -EFAULT; | |
1153 | if (copy_from_user(page, buf, count)) | |
1154 | goto out_free_page; | |
1155 | ||
e0182909 | 1156 | page[count] = '\0'; |
1da177e4 LT |
1157 | loginuid = simple_strtoul(page, &tmp, 10); |
1158 | if (tmp == page) { | |
1159 | length = -EINVAL; | |
1160 | goto out_free_page; | |
1161 | ||
1162 | } | |
0a300be6 | 1163 | length = audit_set_loginuid(loginuid); |
1da177e4 LT |
1164 | if (likely(length == 0)) |
1165 | length = count; | |
1166 | ||
1167 | out_free_page: | |
1168 | free_page((unsigned long) page); | |
1169 | return length; | |
1170 | } | |
1171 | ||
00977a59 | 1172 | static const struct file_operations proc_loginuid_operations = { |
1da177e4 LT |
1173 | .read = proc_loginuid_read, |
1174 | .write = proc_loginuid_write, | |
87df8424 | 1175 | .llseek = generic_file_llseek, |
1da177e4 | 1176 | }; |
1e0bd755 EP |
1177 | |
1178 | static ssize_t proc_sessionid_read(struct file * file, char __user * buf, | |
1179 | size_t count, loff_t *ppos) | |
1180 | { | |
1181 | struct inode * inode = file->f_path.dentry->d_inode; | |
1182 | struct task_struct *task = get_proc_task(inode); | |
1183 | ssize_t length; | |
1184 | char tmpbuf[TMPBUFLEN]; | |
1185 | ||
1186 | if (!task) | |
1187 | return -ESRCH; | |
1188 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", | |
1189 | audit_get_sessionid(task)); | |
1190 | put_task_struct(task); | |
1191 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
1192 | } | |
1193 | ||
1194 | static const struct file_operations proc_sessionid_operations = { | |
1195 | .read = proc_sessionid_read, | |
87df8424 | 1196 | .llseek = generic_file_llseek, |
1e0bd755 | 1197 | }; |
1da177e4 LT |
1198 | #endif |
1199 | ||
f4f154fd AM |
1200 | #ifdef CONFIG_FAULT_INJECTION |
1201 | static ssize_t proc_fault_inject_read(struct file * file, char __user * buf, | |
1202 | size_t count, loff_t *ppos) | |
1203 | { | |
1204 | struct task_struct *task = get_proc_task(file->f_dentry->d_inode); | |
1205 | char buffer[PROC_NUMBUF]; | |
1206 | size_t len; | |
1207 | int make_it_fail; | |
f4f154fd AM |
1208 | |
1209 | if (!task) | |
1210 | return -ESRCH; | |
1211 | make_it_fail = task->make_it_fail; | |
1212 | put_task_struct(task); | |
1213 | ||
1214 | len = snprintf(buffer, sizeof(buffer), "%i\n", make_it_fail); | |
0c28f287 AM |
1215 | |
1216 | return simple_read_from_buffer(buf, count, ppos, buffer, len); | |
f4f154fd AM |
1217 | } |
1218 | ||
1219 | static ssize_t proc_fault_inject_write(struct file * file, | |
1220 | const char __user * buf, size_t count, loff_t *ppos) | |
1221 | { | |
1222 | struct task_struct *task; | |
1223 | char buffer[PROC_NUMBUF], *end; | |
1224 | int make_it_fail; | |
1225 | ||
1226 | if (!capable(CAP_SYS_RESOURCE)) | |
1227 | return -EPERM; | |
1228 | memset(buffer, 0, sizeof(buffer)); | |
1229 | if (count > sizeof(buffer) - 1) | |
1230 | count = sizeof(buffer) - 1; | |
1231 | if (copy_from_user(buffer, buf, count)) | |
1232 | return -EFAULT; | |
cba8aafe VL |
1233 | make_it_fail = simple_strtol(strstrip(buffer), &end, 0); |
1234 | if (*end) | |
1235 | return -EINVAL; | |
f4f154fd AM |
1236 | task = get_proc_task(file->f_dentry->d_inode); |
1237 | if (!task) | |
1238 | return -ESRCH; | |
1239 | task->make_it_fail = make_it_fail; | |
1240 | put_task_struct(task); | |
cba8aafe VL |
1241 | |
1242 | return count; | |
f4f154fd AM |
1243 | } |
1244 | ||
00977a59 | 1245 | static const struct file_operations proc_fault_inject_operations = { |
f4f154fd AM |
1246 | .read = proc_fault_inject_read, |
1247 | .write = proc_fault_inject_write, | |
87df8424 | 1248 | .llseek = generic_file_llseek, |
f4f154fd AM |
1249 | }; |
1250 | #endif | |
1251 | ||
9745512c | 1252 | |
43ae34cb IM |
1253 | #ifdef CONFIG_SCHED_DEBUG |
1254 | /* | |
1255 | * Print out various scheduling related per-task fields: | |
1256 | */ | |
1257 | static int sched_show(struct seq_file *m, void *v) | |
1258 | { | |
1259 | struct inode *inode = m->private; | |
1260 | struct task_struct *p; | |
1261 | ||
43ae34cb IM |
1262 | p = get_proc_task(inode); |
1263 | if (!p) | |
1264 | return -ESRCH; | |
1265 | proc_sched_show_task(p, m); | |
1266 | ||
1267 | put_task_struct(p); | |
1268 | ||
1269 | return 0; | |
1270 | } | |
1271 | ||
1272 | static ssize_t | |
1273 | sched_write(struct file *file, const char __user *buf, | |
1274 | size_t count, loff_t *offset) | |
1275 | { | |
1276 | struct inode *inode = file->f_path.dentry->d_inode; | |
1277 | struct task_struct *p; | |
1278 | ||
43ae34cb IM |
1279 | p = get_proc_task(inode); |
1280 | if (!p) | |
1281 | return -ESRCH; | |
1282 | proc_sched_set_task(p); | |
1283 | ||
1284 | put_task_struct(p); | |
1285 | ||
1286 | return count; | |
1287 | } | |
1288 | ||
1289 | static int sched_open(struct inode *inode, struct file *filp) | |
1290 | { | |
c6a34058 | 1291 | return single_open(filp, sched_show, inode); |
43ae34cb IM |
1292 | } |
1293 | ||
1294 | static const struct file_operations proc_pid_sched_operations = { | |
1295 | .open = sched_open, | |
1296 | .read = seq_read, | |
1297 | .write = sched_write, | |
1298 | .llseek = seq_lseek, | |
5ea473a1 | 1299 | .release = single_release, |
43ae34cb IM |
1300 | }; |
1301 | ||
1302 | #endif | |
1303 | ||
5091faa4 MG |
1304 | #ifdef CONFIG_SCHED_AUTOGROUP |
1305 | /* | |
1306 | * Print out autogroup related information: | |
1307 | */ | |
1308 | static int sched_autogroup_show(struct seq_file *m, void *v) | |
1309 | { | |
1310 | struct inode *inode = m->private; | |
1311 | struct task_struct *p; | |
1312 | ||
1313 | p = get_proc_task(inode); | |
1314 | if (!p) | |
1315 | return -ESRCH; | |
1316 | proc_sched_autogroup_show_task(p, m); | |
1317 | ||
1318 | put_task_struct(p); | |
1319 | ||
1320 | return 0; | |
1321 | } | |
1322 | ||
1323 | static ssize_t | |
1324 | sched_autogroup_write(struct file *file, const char __user *buf, | |
1325 | size_t count, loff_t *offset) | |
1326 | { | |
1327 | struct inode *inode = file->f_path.dentry->d_inode; | |
1328 | struct task_struct *p; | |
1329 | char buffer[PROC_NUMBUF]; | |
0a8cb8e3 | 1330 | int nice; |
5091faa4 MG |
1331 | int err; |
1332 | ||
1333 | memset(buffer, 0, sizeof(buffer)); | |
1334 | if (count > sizeof(buffer) - 1) | |
1335 | count = sizeof(buffer) - 1; | |
1336 | if (copy_from_user(buffer, buf, count)) | |
1337 | return -EFAULT; | |
1338 | ||
0a8cb8e3 AD |
1339 | err = kstrtoint(strstrip(buffer), 0, &nice); |
1340 | if (err < 0) | |
1341 | return err; | |
5091faa4 MG |
1342 | |
1343 | p = get_proc_task(inode); | |
1344 | if (!p) | |
1345 | return -ESRCH; | |
1346 | ||
1347 | err = nice; | |
1348 | err = proc_sched_autogroup_set_nice(p, &err); | |
1349 | if (err) | |
1350 | count = err; | |
1351 | ||
1352 | put_task_struct(p); | |
1353 | ||
1354 | return count; | |
1355 | } | |
1356 | ||
1357 | static int sched_autogroup_open(struct inode *inode, struct file *filp) | |
1358 | { | |
1359 | int ret; | |
1360 | ||
1361 | ret = single_open(filp, sched_autogroup_show, NULL); | |
1362 | if (!ret) { | |
1363 | struct seq_file *m = filp->private_data; | |
1364 | ||
1365 | m->private = inode; | |
1366 | } | |
1367 | return ret; | |
1368 | } | |
1369 | ||
1370 | static const struct file_operations proc_pid_sched_autogroup_operations = { | |
1371 | .open = sched_autogroup_open, | |
1372 | .read = seq_read, | |
1373 | .write = sched_autogroup_write, | |
1374 | .llseek = seq_lseek, | |
1375 | .release = single_release, | |
1376 | }; | |
1377 | ||
1378 | #endif /* CONFIG_SCHED_AUTOGROUP */ | |
1379 | ||
4614a696 JS |
1380 | static ssize_t comm_write(struct file *file, const char __user *buf, |
1381 | size_t count, loff_t *offset) | |
1382 | { | |
1383 | struct inode *inode = file->f_path.dentry->d_inode; | |
1384 | struct task_struct *p; | |
1385 | char buffer[TASK_COMM_LEN]; | |
1386 | ||
1387 | memset(buffer, 0, sizeof(buffer)); | |
1388 | if (count > sizeof(buffer) - 1) | |
1389 | count = sizeof(buffer) - 1; | |
1390 | if (copy_from_user(buffer, buf, count)) | |
1391 | return -EFAULT; | |
1392 | ||
1393 | p = get_proc_task(inode); | |
1394 | if (!p) | |
1395 | return -ESRCH; | |
1396 | ||
1397 | if (same_thread_group(current, p)) | |
1398 | set_task_comm(p, buffer); | |
1399 | else | |
1400 | count = -EINVAL; | |
1401 | ||
1402 | put_task_struct(p); | |
1403 | ||
1404 | return count; | |
1405 | } | |
1406 | ||
1407 | static int comm_show(struct seq_file *m, void *v) | |
1408 | { | |
1409 | struct inode *inode = m->private; | |
1410 | struct task_struct *p; | |
1411 | ||
1412 | p = get_proc_task(inode); | |
1413 | if (!p) | |
1414 | return -ESRCH; | |
1415 | ||
1416 | task_lock(p); | |
1417 | seq_printf(m, "%s\n", p->comm); | |
1418 | task_unlock(p); | |
1419 | ||
1420 | put_task_struct(p); | |
1421 | ||
1422 | return 0; | |
1423 | } | |
1424 | ||
1425 | static int comm_open(struct inode *inode, struct file *filp) | |
1426 | { | |
c6a34058 | 1427 | return single_open(filp, comm_show, inode); |
4614a696 JS |
1428 | } |
1429 | ||
1430 | static const struct file_operations proc_pid_set_comm_operations = { | |
1431 | .open = comm_open, | |
1432 | .read = seq_read, | |
1433 | .write = comm_write, | |
1434 | .llseek = seq_lseek, | |
1435 | .release = single_release, | |
1436 | }; | |
1437 | ||
7773fbc5 | 1438 | static int proc_exe_link(struct dentry *dentry, struct path *exe_path) |
925d1c40 MH |
1439 | { |
1440 | struct task_struct *task; | |
1441 | struct mm_struct *mm; | |
1442 | struct file *exe_file; | |
1443 | ||
7773fbc5 | 1444 | task = get_proc_task(dentry->d_inode); |
925d1c40 MH |
1445 | if (!task) |
1446 | return -ENOENT; | |
1447 | mm = get_task_mm(task); | |
1448 | put_task_struct(task); | |
1449 | if (!mm) | |
1450 | return -ENOENT; | |
1451 | exe_file = get_mm_exe_file(mm); | |
1452 | mmput(mm); | |
1453 | if (exe_file) { | |
1454 | *exe_path = exe_file->f_path; | |
1455 | path_get(&exe_file->f_path); | |
1456 | fput(exe_file); | |
1457 | return 0; | |
1458 | } else | |
1459 | return -ENOENT; | |
1460 | } | |
1461 | ||
008b150a | 1462 | static void *proc_pid_follow_link(struct dentry *dentry, struct nameidata *nd) |
1da177e4 LT |
1463 | { |
1464 | struct inode *inode = dentry->d_inode; | |
1465 | int error = -EACCES; | |
1466 | ||
1467 | /* We don't need a base pointer in the /proc filesystem */ | |
1d957f9b | 1468 | path_put(&nd->path); |
1da177e4 | 1469 | |
778c1144 EB |
1470 | /* Are we allowed to snoop on the tasks file descriptors? */ |
1471 | if (!proc_fd_access_allowed(inode)) | |
1da177e4 | 1472 | goto out; |
1da177e4 | 1473 | |
7773fbc5 | 1474 | error = PROC_I(inode)->op.proc_get_link(dentry, &nd->path); |
1da177e4 | 1475 | out: |
008b150a | 1476 | return ERR_PTR(error); |
1da177e4 LT |
1477 | } |
1478 | ||
3dcd25f3 | 1479 | static int do_proc_readlink(struct path *path, char __user *buffer, int buflen) |
1da177e4 | 1480 | { |
e12ba74d | 1481 | char *tmp = (char*)__get_free_page(GFP_TEMPORARY); |
3dcd25f3 | 1482 | char *pathname; |
1da177e4 LT |
1483 | int len; |
1484 | ||
1485 | if (!tmp) | |
1486 | return -ENOMEM; | |
0c28f287 | 1487 | |
7b2a69ba | 1488 | pathname = d_path(path, tmp, PAGE_SIZE); |
3dcd25f3 JB |
1489 | len = PTR_ERR(pathname); |
1490 | if (IS_ERR(pathname)) | |
1da177e4 | 1491 | goto out; |
3dcd25f3 | 1492 | len = tmp + PAGE_SIZE - 1 - pathname; |
1da177e4 LT |
1493 | |
1494 | if (len > buflen) | |
1495 | len = buflen; | |
3dcd25f3 | 1496 | if (copy_to_user(buffer, pathname, len)) |
1da177e4 LT |
1497 | len = -EFAULT; |
1498 | out: | |
1499 | free_page((unsigned long)tmp); | |
1500 | return len; | |
1501 | } | |
1502 | ||
1503 | static int proc_pid_readlink(struct dentry * dentry, char __user * buffer, int buflen) | |
1504 | { | |
1505 | int error = -EACCES; | |
1506 | struct inode *inode = dentry->d_inode; | |
3dcd25f3 | 1507 | struct path path; |
1da177e4 | 1508 | |
778c1144 EB |
1509 | /* Are we allowed to snoop on the tasks file descriptors? */ |
1510 | if (!proc_fd_access_allowed(inode)) | |
1da177e4 | 1511 | goto out; |
1da177e4 | 1512 | |
7773fbc5 | 1513 | error = PROC_I(inode)->op.proc_get_link(dentry, &path); |
1da177e4 LT |
1514 | if (error) |
1515 | goto out; | |
1516 | ||
3dcd25f3 JB |
1517 | error = do_proc_readlink(&path, buffer, buflen); |
1518 | path_put(&path); | |
1da177e4 | 1519 | out: |
1da177e4 LT |
1520 | return error; |
1521 | } | |
1522 | ||
c5ef1c42 | 1523 | static const struct inode_operations proc_pid_link_inode_operations = { |
1da177e4 | 1524 | .readlink = proc_pid_readlink, |
6d76fa58 LT |
1525 | .follow_link = proc_pid_follow_link, |
1526 | .setattr = proc_setattr, | |
1da177e4 LT |
1527 | }; |
1528 | ||
28a6d671 EB |
1529 | |
1530 | /* building an inode */ | |
1531 | ||
1532 | static int task_dumpable(struct task_struct *task) | |
1da177e4 | 1533 | { |
28a6d671 EB |
1534 | int dumpable = 0; |
1535 | struct mm_struct *mm; | |
1da177e4 | 1536 | |
28a6d671 EB |
1537 | task_lock(task); |
1538 | mm = task->mm; | |
1539 | if (mm) | |
6c5d5238 | 1540 | dumpable = get_dumpable(mm); |
28a6d671 EB |
1541 | task_unlock(task); |
1542 | if(dumpable == 1) | |
1543 | return 1; | |
1544 | return 0; | |
1545 | } | |
1da177e4 | 1546 | |
6b4e306a | 1547 | struct inode *proc_pid_make_inode(struct super_block * sb, struct task_struct *task) |
28a6d671 EB |
1548 | { |
1549 | struct inode * inode; | |
1550 | struct proc_inode *ei; | |
c69e8d9c | 1551 | const struct cred *cred; |
1da177e4 | 1552 | |
28a6d671 | 1553 | /* We need a new inode */ |
1da177e4 | 1554 | |
28a6d671 EB |
1555 | inode = new_inode(sb); |
1556 | if (!inode) | |
1557 | goto out; | |
1558 | ||
1559 | /* Common stuff */ | |
1560 | ei = PROC_I(inode); | |
85fe4025 | 1561 | inode->i_ino = get_next_ino(); |
28a6d671 | 1562 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; |
28a6d671 EB |
1563 | inode->i_op = &proc_def_inode_operations; |
1564 | ||
1565 | /* | |
1566 | * grab the reference to task. | |
1567 | */ | |
1a657f78 | 1568 | ei->pid = get_task_pid(task, PIDTYPE_PID); |
28a6d671 EB |
1569 | if (!ei->pid) |
1570 | goto out_unlock; | |
1571 | ||
28a6d671 | 1572 | if (task_dumpable(task)) { |
c69e8d9c DH |
1573 | rcu_read_lock(); |
1574 | cred = __task_cred(task); | |
1575 | inode->i_uid = cred->euid; | |
1576 | inode->i_gid = cred->egid; | |
1577 | rcu_read_unlock(); | |
1da177e4 | 1578 | } |
28a6d671 EB |
1579 | security_task_to_inode(task, inode); |
1580 | ||
1da177e4 | 1581 | out: |
28a6d671 EB |
1582 | return inode; |
1583 | ||
1584 | out_unlock: | |
1585 | iput(inode); | |
1586 | return NULL; | |
1da177e4 LT |
1587 | } |
1588 | ||
6b4e306a | 1589 | int pid_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) |
1da177e4 | 1590 | { |
1da177e4 | 1591 | struct inode *inode = dentry->d_inode; |
28a6d671 | 1592 | struct task_struct *task; |
c69e8d9c | 1593 | const struct cred *cred; |
0499680a | 1594 | struct pid_namespace *pid = dentry->d_sb->s_fs_info; |
c69e8d9c | 1595 | |
28a6d671 | 1596 | generic_fillattr(inode, stat); |
1da177e4 | 1597 | |
28a6d671 EB |
1598 | rcu_read_lock(); |
1599 | stat->uid = 0; | |
1600 | stat->gid = 0; | |
1601 | task = pid_task(proc_pid(inode), PIDTYPE_PID); | |
1602 | if (task) { | |
0499680a VK |
1603 | if (!has_pid_permissions(pid, task, 2)) { |
1604 | rcu_read_unlock(); | |
1605 | /* | |
1606 | * This doesn't prevent learning whether PID exists, | |
1607 | * it only makes getattr() consistent with readdir(). | |
1608 | */ | |
1609 | return -ENOENT; | |
1610 | } | |
28a6d671 EB |
1611 | if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) || |
1612 | task_dumpable(task)) { | |
c69e8d9c DH |
1613 | cred = __task_cred(task); |
1614 | stat->uid = cred->euid; | |
1615 | stat->gid = cred->egid; | |
1da177e4 LT |
1616 | } |
1617 | } | |
28a6d671 | 1618 | rcu_read_unlock(); |
d6e71144 | 1619 | return 0; |
1da177e4 LT |
1620 | } |
1621 | ||
1da177e4 LT |
1622 | /* dentry stuff */ |
1623 | ||
1624 | /* | |
1625 | * Exceptional case: normally we are not allowed to unhash a busy | |
1626 | * directory. In this case, however, we can do it - no aliasing problems | |
1627 | * due to the way we treat inodes. | |
1628 | * | |
1629 | * Rewrite the inode's ownerships here because the owning task may have | |
1630 | * performed a setuid(), etc. | |
99f89551 EB |
1631 | * |
1632 | * Before the /proc/pid/status file was created the only way to read | |
1633 | * the effective uid of a /process was to stat /proc/pid. Reading | |
1634 | * /proc/pid/status is slow enough that procps and other packages | |
1635 | * kept stating /proc/pid. To keep the rules in /proc simple I have | |
1636 | * made this apply to all per process world readable and executable | |
1637 | * directories. | |
1da177e4 | 1638 | */ |
6b4e306a | 1639 | int pid_revalidate(struct dentry *dentry, struct nameidata *nd) |
1da177e4 | 1640 | { |
34286d66 NP |
1641 | struct inode *inode; |
1642 | struct task_struct *task; | |
c69e8d9c DH |
1643 | const struct cred *cred; |
1644 | ||
34286d66 NP |
1645 | if (nd && nd->flags & LOOKUP_RCU) |
1646 | return -ECHILD; | |
1647 | ||
1648 | inode = dentry->d_inode; | |
1649 | task = get_proc_task(inode); | |
1650 | ||
99f89551 EB |
1651 | if (task) { |
1652 | if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) || | |
1653 | task_dumpable(task)) { | |
c69e8d9c DH |
1654 | rcu_read_lock(); |
1655 | cred = __task_cred(task); | |
1656 | inode->i_uid = cred->euid; | |
1657 | inode->i_gid = cred->egid; | |
1658 | rcu_read_unlock(); | |
1da177e4 LT |
1659 | } else { |
1660 | inode->i_uid = 0; | |
1661 | inode->i_gid = 0; | |
1662 | } | |
9ee8ab9f | 1663 | inode->i_mode &= ~(S_ISUID | S_ISGID); |
1da177e4 | 1664 | security_task_to_inode(task, inode); |
99f89551 | 1665 | put_task_struct(task); |
1da177e4 LT |
1666 | return 1; |
1667 | } | |
1668 | d_drop(dentry); | |
1669 | return 0; | |
1670 | } | |
1671 | ||
fe15ce44 | 1672 | static int pid_delete_dentry(const struct dentry * dentry) |
99f89551 | 1673 | { |
28a6d671 EB |
1674 | /* Is the task we represent dead? |
1675 | * If so, then don't put the dentry on the lru list, | |
1676 | * kill it immediately. | |
1677 | */ | |
1678 | return !proc_pid(dentry->d_inode)->tasks[PIDTYPE_PID].first; | |
1679 | } | |
1680 | ||
6b4e306a | 1681 | const struct dentry_operations pid_dentry_operations = |
28a6d671 EB |
1682 | { |
1683 | .d_revalidate = pid_revalidate, | |
1684 | .d_delete = pid_delete_dentry, | |
1685 | }; | |
1686 | ||
1687 | /* Lookups */ | |
1688 | ||
1c0d04c9 EB |
1689 | /* |
1690 | * Fill a directory entry. | |
1691 | * | |
1692 | * If possible create the dcache entry and derive our inode number and | |
1693 | * file type from dcache entry. | |
1694 | * | |
1695 | * Since all of the proc inode numbers are dynamically generated, the inode | |
1696 | * numbers do not exist until the inode is cache. This means creating the | |
1697 | * the dcache entry in readdir is necessary to keep the inode numbers | |
1698 | * reported by readdir in sync with the inode numbers reported | |
1699 | * by stat. | |
1700 | */ | |
6b4e306a EB |
1701 | int proc_fill_cache(struct file *filp, void *dirent, filldir_t filldir, |
1702 | const char *name, int len, | |
c5141e6d | 1703 | instantiate_t instantiate, struct task_struct *task, const void *ptr) |
61a28784 | 1704 | { |
2fddfeef | 1705 | struct dentry *child, *dir = filp->f_path.dentry; |
61a28784 EB |
1706 | struct inode *inode; |
1707 | struct qstr qname; | |
1708 | ino_t ino = 0; | |
1709 | unsigned type = DT_UNKNOWN; | |
1710 | ||
1711 | qname.name = name; | |
1712 | qname.len = len; | |
1713 | qname.hash = full_name_hash(name, len); | |
1714 | ||
1715 | child = d_lookup(dir, &qname); | |
1716 | if (!child) { | |
1717 | struct dentry *new; | |
1718 | new = d_alloc(dir, &qname); | |
1719 | if (new) { | |
1720 | child = instantiate(dir->d_inode, new, task, ptr); | |
1721 | if (child) | |
1722 | dput(new); | |
1723 | else | |
1724 | child = new; | |
1725 | } | |
1726 | } | |
1727 | if (!child || IS_ERR(child) || !child->d_inode) | |
1728 | goto end_instantiate; | |
1729 | inode = child->d_inode; | |
1730 | if (inode) { | |
1731 | ino = inode->i_ino; | |
1732 | type = inode->i_mode >> 12; | |
1733 | } | |
1734 | dput(child); | |
1735 | end_instantiate: | |
1736 | if (!ino) | |
1737 | ino = find_inode_number(dir, &qname); | |
1738 | if (!ino) | |
1739 | ino = 1; | |
1740 | return filldir(dirent, name, len, filp->f_pos, ino, type); | |
1741 | } | |
1742 | ||
28a6d671 EB |
1743 | static unsigned name_to_int(struct dentry *dentry) |
1744 | { | |
1745 | const char *name = dentry->d_name.name; | |
1746 | int len = dentry->d_name.len; | |
1747 | unsigned n = 0; | |
1748 | ||
1749 | if (len > 1 && *name == '0') | |
1750 | goto out; | |
1751 | while (len-- > 0) { | |
1752 | unsigned c = *name++ - '0'; | |
1753 | if (c > 9) | |
1754 | goto out; | |
1755 | if (n >= (~0U-9)/10) | |
1756 | goto out; | |
1757 | n *= 10; | |
1758 | n += c; | |
1759 | } | |
1760 | return n; | |
1761 | out: | |
1762 | return ~0U; | |
1763 | } | |
1764 | ||
27932742 MS |
1765 | #define PROC_FDINFO_MAX 64 |
1766 | ||
3dcd25f3 | 1767 | static int proc_fd_info(struct inode *inode, struct path *path, char *info) |
28a6d671 | 1768 | { |
5e442a49 LT |
1769 | struct task_struct *task = get_proc_task(inode); |
1770 | struct files_struct *files = NULL; | |
28a6d671 EB |
1771 | struct file *file; |
1772 | int fd = proc_fd(inode); | |
aa6afca5 | 1773 | |
5e442a49 LT |
1774 | if (task) { |
1775 | files = get_files_struct(task); | |
1776 | put_task_struct(task); | |
1777 | } | |
1778 | if (files) { | |
1779 | /* | |
1780 | * We are not taking a ref to the file structure, so we must | |
1781 | * hold ->file_lock. | |
1782 | */ | |
1783 | spin_lock(&files->file_lock); | |
1784 | file = fcheck_files(files, fd); | |
1785 | if (file) { | |
1786 | unsigned int f_flags; | |
1787 | struct fdtable *fdt; | |
1788 | ||
1789 | fdt = files_fdtable(files); | |
1790 | f_flags = file->f_flags & ~O_CLOEXEC; | |
1791 | if (FD_ISSET(fd, fdt->close_on_exec)) | |
1792 | f_flags |= O_CLOEXEC; | |
1793 | ||
1794 | if (path) { | |
1795 | *path = file->f_path; | |
1796 | path_get(&file->f_path); | |
1797 | } | |
1798 | if (info) | |
1799 | snprintf(info, PROC_FDINFO_MAX, | |
1800 | "pos:\t%lli\n" | |
1801 | "flags:\t0%o\n", | |
1802 | (long long) file->f_pos, | |
1803 | f_flags); | |
1804 | spin_unlock(&files->file_lock); | |
1805 | put_files_struct(files); | |
1806 | return 0; | |
99f89551 | 1807 | } |
5e442a49 LT |
1808 | spin_unlock(&files->file_lock); |
1809 | put_files_struct(files); | |
1810 | } | |
1811 | return -ENOENT; | |
99f89551 EB |
1812 | } |
1813 | ||
7773fbc5 | 1814 | static int proc_fd_link(struct dentry *dentry, struct path *path) |
27932742 | 1815 | { |
7773fbc5 | 1816 | return proc_fd_info(dentry->d_inode, path, NULL); |
27932742 MS |
1817 | } |
1818 | ||
1da177e4 LT |
1819 | static int tid_fd_revalidate(struct dentry *dentry, struct nameidata *nd) |
1820 | { | |
34286d66 NP |
1821 | struct inode *inode; |
1822 | struct task_struct *task; | |
1823 | int fd; | |
1da177e4 | 1824 | struct files_struct *files; |
c69e8d9c | 1825 | const struct cred *cred; |
1da177e4 | 1826 | |
34286d66 NP |
1827 | if (nd && nd->flags & LOOKUP_RCU) |
1828 | return -ECHILD; | |
1829 | ||
1830 | inode = dentry->d_inode; | |
1831 | task = get_proc_task(inode); | |
1832 | fd = proc_fd(inode); | |
1833 | ||
99f89551 EB |
1834 | if (task) { |
1835 | files = get_files_struct(task); | |
1836 | if (files) { | |
1837 | rcu_read_lock(); | |
1838 | if (fcheck_files(files, fd)) { | |
1839 | rcu_read_unlock(); | |
1840 | put_files_struct(files); | |
1841 | if (task_dumpable(task)) { | |
c69e8d9c DH |
1842 | rcu_read_lock(); |
1843 | cred = __task_cred(task); | |
1844 | inode->i_uid = cred->euid; | |
1845 | inode->i_gid = cred->egid; | |
1846 | rcu_read_unlock(); | |
99f89551 EB |
1847 | } else { |
1848 | inode->i_uid = 0; | |
1849 | inode->i_gid = 0; | |
1850 | } | |
9ee8ab9f | 1851 | inode->i_mode &= ~(S_ISUID | S_ISGID); |
99f89551 EB |
1852 | security_task_to_inode(task, inode); |
1853 | put_task_struct(task); | |
1854 | return 1; | |
1855 | } | |
b835996f | 1856 | rcu_read_unlock(); |
1da177e4 | 1857 | put_files_struct(files); |
1da177e4 | 1858 | } |
99f89551 | 1859 | put_task_struct(task); |
1da177e4 LT |
1860 | } |
1861 | d_drop(dentry); | |
1862 | return 0; | |
1863 | } | |
1864 | ||
d72f71eb | 1865 | static const struct dentry_operations tid_fd_dentry_operations = |
1da177e4 LT |
1866 | { |
1867 | .d_revalidate = tid_fd_revalidate, | |
1868 | .d_delete = pid_delete_dentry, | |
1869 | }; | |
1870 | ||
444ceed8 | 1871 | static struct dentry *proc_fd_instantiate(struct inode *dir, |
c5141e6d | 1872 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
1da177e4 | 1873 | { |
c5141e6d | 1874 | unsigned fd = *(const unsigned *)ptr; |
444ceed8 EB |
1875 | struct file *file; |
1876 | struct files_struct *files; | |
1877 | struct inode *inode; | |
1878 | struct proc_inode *ei; | |
1879 | struct dentry *error = ERR_PTR(-ENOENT); | |
1da177e4 | 1880 | |
61a28784 | 1881 | inode = proc_pid_make_inode(dir->i_sb, task); |
1da177e4 LT |
1882 | if (!inode) |
1883 | goto out; | |
1884 | ei = PROC_I(inode); | |
aed7a6c4 | 1885 | ei->fd = fd; |
1da177e4 LT |
1886 | files = get_files_struct(task); |
1887 | if (!files) | |
444ceed8 | 1888 | goto out_iput; |
1da177e4 | 1889 | inode->i_mode = S_IFLNK; |
ca99c1da DS |
1890 | |
1891 | /* | |
1892 | * We are not taking a ref to the file structure, so we must | |
1893 | * hold ->file_lock. | |
1894 | */ | |
1895 | spin_lock(&files->file_lock); | |
1da177e4 LT |
1896 | file = fcheck_files(files, fd); |
1897 | if (!file) | |
444ceed8 | 1898 | goto out_unlock; |
aeb5d727 | 1899 | if (file->f_mode & FMODE_READ) |
1da177e4 | 1900 | inode->i_mode |= S_IRUSR | S_IXUSR; |
aeb5d727 | 1901 | if (file->f_mode & FMODE_WRITE) |
1da177e4 | 1902 | inode->i_mode |= S_IWUSR | S_IXUSR; |
ca99c1da | 1903 | spin_unlock(&files->file_lock); |
1da177e4 | 1904 | put_files_struct(files); |
444ceed8 | 1905 | |
5e442a49 | 1906 | inode->i_op = &proc_pid_link_inode_operations; |
1da177e4 LT |
1907 | inode->i_size = 64; |
1908 | ei->op.proc_get_link = proc_fd_link; | |
fb045adb | 1909 | d_set_d_op(dentry, &tid_fd_dentry_operations); |
1da177e4 | 1910 | d_add(dentry, inode); |
cd6a3ce9 EB |
1911 | /* Close the race of the process dying before we return the dentry */ |
1912 | if (tid_fd_revalidate(dentry, NULL)) | |
444ceed8 | 1913 | error = NULL; |
1da177e4 | 1914 | |
444ceed8 EB |
1915 | out: |
1916 | return error; | |
1917 | out_unlock: | |
ca99c1da | 1918 | spin_unlock(&files->file_lock); |
1da177e4 | 1919 | put_files_struct(files); |
444ceed8 | 1920 | out_iput: |
1da177e4 | 1921 | iput(inode); |
cd6a3ce9 | 1922 | goto out; |
1da177e4 LT |
1923 | } |
1924 | ||
27932742 MS |
1925 | static struct dentry *proc_lookupfd_common(struct inode *dir, |
1926 | struct dentry *dentry, | |
1927 | instantiate_t instantiate) | |
444ceed8 EB |
1928 | { |
1929 | struct task_struct *task = get_proc_task(dir); | |
1930 | unsigned fd = name_to_int(dentry); | |
1931 | struct dentry *result = ERR_PTR(-ENOENT); | |
1932 | ||
1933 | if (!task) | |
1934 | goto out_no_task; | |
1935 | if (fd == ~0U) | |
1936 | goto out; | |
1937 | ||
27932742 | 1938 | result = instantiate(dir, dentry, task, &fd); |
444ceed8 EB |
1939 | out: |
1940 | put_task_struct(task); | |
1941 | out_no_task: | |
1942 | return result; | |
1943 | } | |
1944 | ||
27932742 MS |
1945 | static int proc_readfd_common(struct file * filp, void * dirent, |
1946 | filldir_t filldir, instantiate_t instantiate) | |
28a6d671 | 1947 | { |
2fddfeef | 1948 | struct dentry *dentry = filp->f_path.dentry; |
28a6d671 EB |
1949 | struct inode *inode = dentry->d_inode; |
1950 | struct task_struct *p = get_proc_task(inode); | |
457c2510 | 1951 | unsigned int fd, ino; |
28a6d671 | 1952 | int retval; |
28a6d671 | 1953 | struct files_struct * files; |
1da177e4 | 1954 | |
28a6d671 EB |
1955 | retval = -ENOENT; |
1956 | if (!p) | |
1957 | goto out_no_task; | |
1958 | retval = 0; | |
28a6d671 EB |
1959 | |
1960 | fd = filp->f_pos; | |
1961 | switch (fd) { | |
1962 | case 0: | |
1963 | if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0) | |
5e442a49 | 1964 | goto out; |
28a6d671 EB |
1965 | filp->f_pos++; |
1966 | case 1: | |
1967 | ino = parent_ino(dentry); | |
1968 | if (filldir(dirent, "..", 2, 1, ino, DT_DIR) < 0) | |
5e442a49 | 1969 | goto out; |
28a6d671 EB |
1970 | filp->f_pos++; |
1971 | default: | |
1972 | files = get_files_struct(p); | |
1973 | if (!files) | |
5e442a49 | 1974 | goto out; |
28a6d671 | 1975 | rcu_read_lock(); |
28a6d671 | 1976 | for (fd = filp->f_pos-2; |
9b4f526c | 1977 | fd < files_fdtable(files)->max_fds; |
28a6d671 | 1978 | fd++, filp->f_pos++) { |
27932742 MS |
1979 | char name[PROC_NUMBUF]; |
1980 | int len; | |
28a6d671 EB |
1981 | |
1982 | if (!fcheck_files(files, fd)) | |
1983 | continue; | |
1984 | rcu_read_unlock(); | |
1985 | ||
27932742 MS |
1986 | len = snprintf(name, sizeof(name), "%d", fd); |
1987 | if (proc_fill_cache(filp, dirent, filldir, | |
1988 | name, len, instantiate, | |
1989 | p, &fd) < 0) { | |
28a6d671 EB |
1990 | rcu_read_lock(); |
1991 | break; | |
1992 | } | |
1993 | rcu_read_lock(); | |
1994 | } | |
1995 | rcu_read_unlock(); | |
1996 | put_files_struct(files); | |
1997 | } | |
1998 | out: | |
1999 | put_task_struct(p); | |
2000 | out_no_task: | |
2001 | return retval; | |
2002 | } | |
2003 | ||
27932742 MS |
2004 | static struct dentry *proc_lookupfd(struct inode *dir, struct dentry *dentry, |
2005 | struct nameidata *nd) | |
2006 | { | |
2007 | return proc_lookupfd_common(dir, dentry, proc_fd_instantiate); | |
2008 | } | |
2009 | ||
2010 | static int proc_readfd(struct file *filp, void *dirent, filldir_t filldir) | |
2011 | { | |
2012 | return proc_readfd_common(filp, dirent, filldir, proc_fd_instantiate); | |
2013 | } | |
2014 | ||
2015 | static ssize_t proc_fdinfo_read(struct file *file, char __user *buf, | |
2016 | size_t len, loff_t *ppos) | |
2017 | { | |
2018 | char tmp[PROC_FDINFO_MAX]; | |
3dcd25f3 | 2019 | int err = proc_fd_info(file->f_path.dentry->d_inode, NULL, tmp); |
27932742 MS |
2020 | if (!err) |
2021 | err = simple_read_from_buffer(buf, len, ppos, tmp, strlen(tmp)); | |
2022 | return err; | |
2023 | } | |
2024 | ||
2025 | static const struct file_operations proc_fdinfo_file_operations = { | |
87df8424 | 2026 | .open = nonseekable_open, |
27932742 | 2027 | .read = proc_fdinfo_read, |
6038f373 | 2028 | .llseek = no_llseek, |
27932742 MS |
2029 | }; |
2030 | ||
00977a59 | 2031 | static const struct file_operations proc_fd_operations = { |
28a6d671 EB |
2032 | .read = generic_read_dir, |
2033 | .readdir = proc_readfd, | |
6038f373 | 2034 | .llseek = default_llseek, |
1da177e4 LT |
2035 | }; |
2036 | ||
640708a2 PE |
2037 | #ifdef CONFIG_CHECKPOINT_RESTORE |
2038 | ||
2039 | /* | |
2040 | * dname_to_vma_addr - maps a dentry name into two unsigned longs | |
2041 | * which represent vma start and end addresses. | |
2042 | */ | |
2043 | static int dname_to_vma_addr(struct dentry *dentry, | |
2044 | unsigned long *start, unsigned long *end) | |
2045 | { | |
2046 | if (sscanf(dentry->d_name.name, "%lx-%lx", start, end) != 2) | |
2047 | return -EINVAL; | |
2048 | ||
2049 | return 0; | |
2050 | } | |
2051 | ||
2052 | static int map_files_d_revalidate(struct dentry *dentry, struct nameidata *nd) | |
2053 | { | |
2054 | unsigned long vm_start, vm_end; | |
2055 | bool exact_vma_exists = false; | |
2056 | struct mm_struct *mm = NULL; | |
2057 | struct task_struct *task; | |
2058 | const struct cred *cred; | |
2059 | struct inode *inode; | |
2060 | int status = 0; | |
2061 | ||
2062 | if (nd && nd->flags & LOOKUP_RCU) | |
2063 | return -ECHILD; | |
2064 | ||
2065 | if (!capable(CAP_SYS_ADMIN)) { | |
2066 | status = -EACCES; | |
2067 | goto out_notask; | |
2068 | } | |
2069 | ||
2070 | inode = dentry->d_inode; | |
2071 | task = get_proc_task(inode); | |
2072 | if (!task) | |
2073 | goto out_notask; | |
2074 | ||
2075 | if (!ptrace_may_access(task, PTRACE_MODE_READ)) | |
2076 | goto out; | |
2077 | ||
2078 | mm = get_task_mm(task); | |
2079 | if (!mm) | |
2080 | goto out; | |
2081 | ||
2082 | if (!dname_to_vma_addr(dentry, &vm_start, &vm_end)) { | |
2083 | down_read(&mm->mmap_sem); | |
2084 | exact_vma_exists = !!find_exact_vma(mm, vm_start, vm_end); | |
2085 | up_read(&mm->mmap_sem); | |
2086 | } | |
2087 | ||
2088 | mmput(mm); | |
2089 | ||
2090 | if (exact_vma_exists) { | |
2091 | if (task_dumpable(task)) { | |
2092 | rcu_read_lock(); | |
2093 | cred = __task_cred(task); | |
2094 | inode->i_uid = cred->euid; | |
2095 | inode->i_gid = cred->egid; | |
2096 | rcu_read_unlock(); | |
2097 | } else { | |
2098 | inode->i_uid = 0; | |
2099 | inode->i_gid = 0; | |
2100 | } | |
2101 | security_task_to_inode(task, inode); | |
2102 | status = 1; | |
2103 | } | |
2104 | ||
2105 | out: | |
2106 | put_task_struct(task); | |
2107 | ||
2108 | out_notask: | |
2109 | if (status <= 0) | |
2110 | d_drop(dentry); | |
2111 | ||
2112 | return status; | |
2113 | } | |
2114 | ||
2115 | static const struct dentry_operations tid_map_files_dentry_operations = { | |
2116 | .d_revalidate = map_files_d_revalidate, | |
2117 | .d_delete = pid_delete_dentry, | |
2118 | }; | |
2119 | ||
2120 | static int proc_map_files_get_link(struct dentry *dentry, struct path *path) | |
2121 | { | |
2122 | unsigned long vm_start, vm_end; | |
2123 | struct vm_area_struct *vma; | |
2124 | struct task_struct *task; | |
2125 | struct mm_struct *mm; | |
2126 | int rc; | |
2127 | ||
2128 | rc = -ENOENT; | |
2129 | task = get_proc_task(dentry->d_inode); | |
2130 | if (!task) | |
2131 | goto out; | |
2132 | ||
2133 | mm = get_task_mm(task); | |
2134 | put_task_struct(task); | |
2135 | if (!mm) | |
2136 | goto out; | |
2137 | ||
2138 | rc = dname_to_vma_addr(dentry, &vm_start, &vm_end); | |
2139 | if (rc) | |
2140 | goto out_mmput; | |
2141 | ||
2142 | down_read(&mm->mmap_sem); | |
2143 | vma = find_exact_vma(mm, vm_start, vm_end); | |
2144 | if (vma && vma->vm_file) { | |
2145 | *path = vma->vm_file->f_path; | |
2146 | path_get(path); | |
2147 | rc = 0; | |
2148 | } | |
2149 | up_read(&mm->mmap_sem); | |
2150 | ||
2151 | out_mmput: | |
2152 | mmput(mm); | |
2153 | out: | |
2154 | return rc; | |
2155 | } | |
2156 | ||
2157 | struct map_files_info { | |
2158 | struct file *file; | |
2159 | unsigned long len; | |
2160 | unsigned char name[4*sizeof(long)+2]; /* max: %lx-%lx\0 */ | |
2161 | }; | |
2162 | ||
2163 | static struct dentry * | |
2164 | proc_map_files_instantiate(struct inode *dir, struct dentry *dentry, | |
2165 | struct task_struct *task, const void *ptr) | |
2166 | { | |
2167 | const struct file *file = ptr; | |
2168 | struct proc_inode *ei; | |
2169 | struct inode *inode; | |
2170 | ||
2171 | if (!file) | |
2172 | return ERR_PTR(-ENOENT); | |
2173 | ||
2174 | inode = proc_pid_make_inode(dir->i_sb, task); | |
2175 | if (!inode) | |
2176 | return ERR_PTR(-ENOENT); | |
2177 | ||
2178 | ei = PROC_I(inode); | |
2179 | ei->op.proc_get_link = proc_map_files_get_link; | |
2180 | ||
2181 | inode->i_op = &proc_pid_link_inode_operations; | |
2182 | inode->i_size = 64; | |
2183 | inode->i_mode = S_IFLNK; | |
2184 | ||
2185 | if (file->f_mode & FMODE_READ) | |
2186 | inode->i_mode |= S_IRUSR; | |
2187 | if (file->f_mode & FMODE_WRITE) | |
2188 | inode->i_mode |= S_IWUSR; | |
2189 | ||
2190 | d_set_d_op(dentry, &tid_map_files_dentry_operations); | |
2191 | d_add(dentry, inode); | |
2192 | ||
2193 | return NULL; | |
2194 | } | |
2195 | ||
2196 | static struct dentry *proc_map_files_lookup(struct inode *dir, | |
2197 | struct dentry *dentry, struct nameidata *nd) | |
2198 | { | |
2199 | unsigned long vm_start, vm_end; | |
2200 | struct vm_area_struct *vma; | |
2201 | struct task_struct *task; | |
2202 | struct dentry *result; | |
2203 | struct mm_struct *mm; | |
2204 | ||
2205 | result = ERR_PTR(-EACCES); | |
2206 | if (!capable(CAP_SYS_ADMIN)) | |
2207 | goto out; | |
2208 | ||
2209 | result = ERR_PTR(-ENOENT); | |
2210 | task = get_proc_task(dir); | |
2211 | if (!task) | |
2212 | goto out; | |
2213 | ||
2214 | result = ERR_PTR(-EACCES); | |
2215 | if (lock_trace(task)) | |
2216 | goto out_put_task; | |
2217 | ||
2218 | result = ERR_PTR(-ENOENT); | |
2219 | if (dname_to_vma_addr(dentry, &vm_start, &vm_end)) | |
2220 | goto out_unlock; | |
2221 | ||
2222 | mm = get_task_mm(task); | |
2223 | if (!mm) | |
2224 | goto out_unlock; | |
2225 | ||
2226 | down_read(&mm->mmap_sem); | |
2227 | vma = find_exact_vma(mm, vm_start, vm_end); | |
2228 | if (!vma) | |
2229 | goto out_no_vma; | |
2230 | ||
2231 | result = proc_map_files_instantiate(dir, dentry, task, vma->vm_file); | |
2232 | ||
2233 | out_no_vma: | |
2234 | up_read(&mm->mmap_sem); | |
2235 | mmput(mm); | |
2236 | out_unlock: | |
2237 | unlock_trace(task); | |
2238 | out_put_task: | |
2239 | put_task_struct(task); | |
2240 | out: | |
2241 | return result; | |
2242 | } | |
2243 | ||
2244 | static const struct inode_operations proc_map_files_inode_operations = { | |
2245 | .lookup = proc_map_files_lookup, | |
2246 | .permission = proc_fd_permission, | |
2247 | .setattr = proc_setattr, | |
2248 | }; | |
2249 | ||
2250 | static int | |
2251 | proc_map_files_readdir(struct file *filp, void *dirent, filldir_t filldir) | |
2252 | { | |
2253 | struct dentry *dentry = filp->f_path.dentry; | |
2254 | struct inode *inode = dentry->d_inode; | |
2255 | struct vm_area_struct *vma; | |
2256 | struct task_struct *task; | |
2257 | struct mm_struct *mm; | |
2258 | ino_t ino; | |
2259 | int ret; | |
2260 | ||
2261 | ret = -EACCES; | |
2262 | if (!capable(CAP_SYS_ADMIN)) | |
2263 | goto out; | |
2264 | ||
2265 | ret = -ENOENT; | |
2266 | task = get_proc_task(inode); | |
2267 | if (!task) | |
2268 | goto out; | |
2269 | ||
2270 | ret = -EACCES; | |
2271 | if (lock_trace(task)) | |
2272 | goto out_put_task; | |
2273 | ||
2274 | ret = 0; | |
2275 | switch (filp->f_pos) { | |
2276 | case 0: | |
2277 | ino = inode->i_ino; | |
2278 | if (filldir(dirent, ".", 1, 0, ino, DT_DIR) < 0) | |
2279 | goto out_unlock; | |
2280 | filp->f_pos++; | |
2281 | case 1: | |
2282 | ino = parent_ino(dentry); | |
2283 | if (filldir(dirent, "..", 2, 1, ino, DT_DIR) < 0) | |
2284 | goto out_unlock; | |
2285 | filp->f_pos++; | |
2286 | default: | |
2287 | { | |
2288 | unsigned long nr_files, pos, i; | |
2289 | struct flex_array *fa = NULL; | |
2290 | struct map_files_info info; | |
2291 | struct map_files_info *p; | |
2292 | ||
2293 | mm = get_task_mm(task); | |
2294 | if (!mm) | |
2295 | goto out_unlock; | |
2296 | down_read(&mm->mmap_sem); | |
2297 | ||
2298 | nr_files = 0; | |
2299 | ||
2300 | /* | |
2301 | * We need two passes here: | |
2302 | * | |
2303 | * 1) Collect vmas of mapped files with mmap_sem taken | |
2304 | * 2) Release mmap_sem and instantiate entries | |
2305 | * | |
2306 | * otherwise we get lockdep complained, since filldir() | |
2307 | * routine might require mmap_sem taken in might_fault(). | |
2308 | */ | |
2309 | ||
2310 | for (vma = mm->mmap, pos = 2; vma; vma = vma->vm_next) { | |
2311 | if (vma->vm_file && ++pos > filp->f_pos) | |
2312 | nr_files++; | |
2313 | } | |
2314 | ||
2315 | if (nr_files) { | |
2316 | fa = flex_array_alloc(sizeof(info), nr_files, | |
2317 | GFP_KERNEL); | |
2318 | if (!fa || flex_array_prealloc(fa, 0, nr_files, | |
2319 | GFP_KERNEL)) { | |
2320 | ret = -ENOMEM; | |
2321 | if (fa) | |
2322 | flex_array_free(fa); | |
2323 | up_read(&mm->mmap_sem); | |
2324 | mmput(mm); | |
2325 | goto out_unlock; | |
2326 | } | |
2327 | for (i = 0, vma = mm->mmap, pos = 2; vma; | |
2328 | vma = vma->vm_next) { | |
2329 | if (!vma->vm_file) | |
2330 | continue; | |
2331 | if (++pos <= filp->f_pos) | |
2332 | continue; | |
2333 | ||
2334 | get_file(vma->vm_file); | |
2335 | info.file = vma->vm_file; | |
2336 | info.len = snprintf(info.name, | |
2337 | sizeof(info.name), "%lx-%lx", | |
2338 | vma->vm_start, vma->vm_end); | |
2339 | if (flex_array_put(fa, i++, &info, GFP_KERNEL)) | |
2340 | BUG(); | |
2341 | } | |
2342 | } | |
2343 | up_read(&mm->mmap_sem); | |
2344 | ||
2345 | for (i = 0; i < nr_files; i++) { | |
2346 | p = flex_array_get(fa, i); | |
2347 | ret = proc_fill_cache(filp, dirent, filldir, | |
2348 | p->name, p->len, | |
2349 | proc_map_files_instantiate, | |
2350 | task, p->file); | |
2351 | if (ret) | |
2352 | break; | |
2353 | filp->f_pos++; | |
2354 | fput(p->file); | |
2355 | } | |
2356 | for (; i < nr_files; i++) { | |
2357 | /* | |
2358 | * In case of error don't forget | |
2359 | * to put rest of file refs. | |
2360 | */ | |
2361 | p = flex_array_get(fa, i); | |
2362 | fput(p->file); | |
2363 | } | |
2364 | if (fa) | |
2365 | flex_array_free(fa); | |
2366 | mmput(mm); | |
2367 | } | |
2368 | } | |
2369 | ||
2370 | out_unlock: | |
2371 | unlock_trace(task); | |
2372 | out_put_task: | |
2373 | put_task_struct(task); | |
2374 | out: | |
2375 | return ret; | |
2376 | } | |
2377 | ||
2378 | static const struct file_operations proc_map_files_operations = { | |
2379 | .read = generic_read_dir, | |
2380 | .readdir = proc_map_files_readdir, | |
2381 | .llseek = default_llseek, | |
2382 | }; | |
2383 | ||
2384 | #endif /* CONFIG_CHECKPOINT_RESTORE */ | |
2385 | ||
8948e11f AD |
2386 | /* |
2387 | * /proc/pid/fd needs a special permission handler so that a process can still | |
2388 | * access /proc/self/fd after it has executed a setuid(). | |
2389 | */ | |
10556cb2 | 2390 | static int proc_fd_permission(struct inode *inode, int mask) |
8948e11f | 2391 | { |
2830ba7f | 2392 | int rv = generic_permission(inode, mask); |
8948e11f AD |
2393 | if (rv == 0) |
2394 | return 0; | |
2395 | if (task_pid(current) == proc_pid(inode)) | |
2396 | rv = 0; | |
2397 | return rv; | |
2398 | } | |
2399 | ||
1da177e4 LT |
2400 | /* |
2401 | * proc directories can do almost nothing.. | |
2402 | */ | |
c5ef1c42 | 2403 | static const struct inode_operations proc_fd_inode_operations = { |
1da177e4 | 2404 | .lookup = proc_lookupfd, |
8948e11f | 2405 | .permission = proc_fd_permission, |
6d76fa58 | 2406 | .setattr = proc_setattr, |
1da177e4 LT |
2407 | }; |
2408 | ||
27932742 MS |
2409 | static struct dentry *proc_fdinfo_instantiate(struct inode *dir, |
2410 | struct dentry *dentry, struct task_struct *task, const void *ptr) | |
2411 | { | |
2412 | unsigned fd = *(unsigned *)ptr; | |
2413 | struct inode *inode; | |
2414 | struct proc_inode *ei; | |
2415 | struct dentry *error = ERR_PTR(-ENOENT); | |
2416 | ||
2417 | inode = proc_pid_make_inode(dir->i_sb, task); | |
2418 | if (!inode) | |
2419 | goto out; | |
2420 | ei = PROC_I(inode); | |
2421 | ei->fd = fd; | |
2422 | inode->i_mode = S_IFREG | S_IRUSR; | |
2423 | inode->i_fop = &proc_fdinfo_file_operations; | |
fb045adb | 2424 | d_set_d_op(dentry, &tid_fd_dentry_operations); |
27932742 MS |
2425 | d_add(dentry, inode); |
2426 | /* Close the race of the process dying before we return the dentry */ | |
2427 | if (tid_fd_revalidate(dentry, NULL)) | |
2428 | error = NULL; | |
2429 | ||
2430 | out: | |
2431 | return error; | |
2432 | } | |
2433 | ||
2434 | static struct dentry *proc_lookupfdinfo(struct inode *dir, | |
2435 | struct dentry *dentry, | |
2436 | struct nameidata *nd) | |
2437 | { | |
2438 | return proc_lookupfd_common(dir, dentry, proc_fdinfo_instantiate); | |
2439 | } | |
2440 | ||
2441 | static int proc_readfdinfo(struct file *filp, void *dirent, filldir_t filldir) | |
2442 | { | |
2443 | return proc_readfd_common(filp, dirent, filldir, | |
2444 | proc_fdinfo_instantiate); | |
2445 | } | |
2446 | ||
2447 | static const struct file_operations proc_fdinfo_operations = { | |
2448 | .read = generic_read_dir, | |
2449 | .readdir = proc_readfdinfo, | |
6038f373 | 2450 | .llseek = default_llseek, |
27932742 MS |
2451 | }; |
2452 | ||
2453 | /* | |
2454 | * proc directories can do almost nothing.. | |
2455 | */ | |
2456 | static const struct inode_operations proc_fdinfo_inode_operations = { | |
2457 | .lookup = proc_lookupfdinfo, | |
2458 | .setattr = proc_setattr, | |
2459 | }; | |
2460 | ||
2461 | ||
444ceed8 | 2462 | static struct dentry *proc_pident_instantiate(struct inode *dir, |
c5141e6d | 2463 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
444ceed8 | 2464 | { |
c5141e6d | 2465 | const struct pid_entry *p = ptr; |
444ceed8 EB |
2466 | struct inode *inode; |
2467 | struct proc_inode *ei; | |
bd6daba9 | 2468 | struct dentry *error = ERR_PTR(-ENOENT); |
444ceed8 | 2469 | |
61a28784 | 2470 | inode = proc_pid_make_inode(dir->i_sb, task); |
444ceed8 EB |
2471 | if (!inode) |
2472 | goto out; | |
2473 | ||
2474 | ei = PROC_I(inode); | |
2475 | inode->i_mode = p->mode; | |
2476 | if (S_ISDIR(inode->i_mode)) | |
bfe86848 | 2477 | set_nlink(inode, 2); /* Use getattr to fix if necessary */ |
444ceed8 EB |
2478 | if (p->iop) |
2479 | inode->i_op = p->iop; | |
2480 | if (p->fop) | |
2481 | inode->i_fop = p->fop; | |
2482 | ei->op = p->op; | |
fb045adb | 2483 | d_set_d_op(dentry, &pid_dentry_operations); |
444ceed8 EB |
2484 | d_add(dentry, inode); |
2485 | /* Close the race of the process dying before we return the dentry */ | |
2486 | if (pid_revalidate(dentry, NULL)) | |
2487 | error = NULL; | |
2488 | out: | |
2489 | return error; | |
2490 | } | |
2491 | ||
1da177e4 LT |
2492 | static struct dentry *proc_pident_lookup(struct inode *dir, |
2493 | struct dentry *dentry, | |
c5141e6d | 2494 | const struct pid_entry *ents, |
7bcd6b0e | 2495 | unsigned int nents) |
1da177e4 | 2496 | { |
cd6a3ce9 | 2497 | struct dentry *error; |
99f89551 | 2498 | struct task_struct *task = get_proc_task(dir); |
c5141e6d | 2499 | const struct pid_entry *p, *last; |
1da177e4 | 2500 | |
cd6a3ce9 | 2501 | error = ERR_PTR(-ENOENT); |
1da177e4 | 2502 | |
99f89551 EB |
2503 | if (!task) |
2504 | goto out_no_task; | |
1da177e4 | 2505 | |
20cdc894 EB |
2506 | /* |
2507 | * Yes, it does not scale. And it should not. Don't add | |
2508 | * new entries into /proc/<tgid>/ without very good reasons. | |
2509 | */ | |
7bcd6b0e EB |
2510 | last = &ents[nents - 1]; |
2511 | for (p = ents; p <= last; p++) { | |
1da177e4 LT |
2512 | if (p->len != dentry->d_name.len) |
2513 | continue; | |
2514 | if (!memcmp(dentry->d_name.name, p->name, p->len)) | |
2515 | break; | |
2516 | } | |
7bcd6b0e | 2517 | if (p > last) |
1da177e4 LT |
2518 | goto out; |
2519 | ||
444ceed8 | 2520 | error = proc_pident_instantiate(dir, dentry, task, p); |
1da177e4 | 2521 | out: |
99f89551 EB |
2522 | put_task_struct(task); |
2523 | out_no_task: | |
cd6a3ce9 | 2524 | return error; |
1da177e4 LT |
2525 | } |
2526 | ||
c5141e6d ED |
2527 | static int proc_pident_fill_cache(struct file *filp, void *dirent, |
2528 | filldir_t filldir, struct task_struct *task, const struct pid_entry *p) | |
61a28784 EB |
2529 | { |
2530 | return proc_fill_cache(filp, dirent, filldir, p->name, p->len, | |
2531 | proc_pident_instantiate, task, p); | |
2532 | } | |
2533 | ||
28a6d671 EB |
2534 | static int proc_pident_readdir(struct file *filp, |
2535 | void *dirent, filldir_t filldir, | |
c5141e6d | 2536 | const struct pid_entry *ents, unsigned int nents) |
28a6d671 EB |
2537 | { |
2538 | int i; | |
2fddfeef | 2539 | struct dentry *dentry = filp->f_path.dentry; |
28a6d671 EB |
2540 | struct inode *inode = dentry->d_inode; |
2541 | struct task_struct *task = get_proc_task(inode); | |
c5141e6d | 2542 | const struct pid_entry *p, *last; |
28a6d671 EB |
2543 | ino_t ino; |
2544 | int ret; | |
2545 | ||
2546 | ret = -ENOENT; | |
2547 | if (!task) | |
61a28784 | 2548 | goto out_no_task; |
28a6d671 EB |
2549 | |
2550 | ret = 0; | |
28a6d671 EB |
2551 | i = filp->f_pos; |
2552 | switch (i) { | |
2553 | case 0: | |
2554 | ino = inode->i_ino; | |
2555 | if (filldir(dirent, ".", 1, i, ino, DT_DIR) < 0) | |
2556 | goto out; | |
2557 | i++; | |
2558 | filp->f_pos++; | |
2559 | /* fall through */ | |
2560 | case 1: | |
2561 | ino = parent_ino(dentry); | |
2562 | if (filldir(dirent, "..", 2, i, ino, DT_DIR) < 0) | |
2563 | goto out; | |
2564 | i++; | |
2565 | filp->f_pos++; | |
2566 | /* fall through */ | |
2567 | default: | |
2568 | i -= 2; | |
2569 | if (i >= nents) { | |
2570 | ret = 1; | |
2571 | goto out; | |
2572 | } | |
2573 | p = ents + i; | |
7bcd6b0e EB |
2574 | last = &ents[nents - 1]; |
2575 | while (p <= last) { | |
61a28784 | 2576 | if (proc_pident_fill_cache(filp, dirent, filldir, task, p) < 0) |
28a6d671 EB |
2577 | goto out; |
2578 | filp->f_pos++; | |
2579 | p++; | |
2580 | } | |
2581 | } | |
2582 | ||
2583 | ret = 1; | |
2584 | out: | |
61a28784 EB |
2585 | put_task_struct(task); |
2586 | out_no_task: | |
28a6d671 | 2587 | return ret; |
1da177e4 LT |
2588 | } |
2589 | ||
28a6d671 EB |
2590 | #ifdef CONFIG_SECURITY |
2591 | static ssize_t proc_pid_attr_read(struct file * file, char __user * buf, | |
2592 | size_t count, loff_t *ppos) | |
2593 | { | |
2fddfeef | 2594 | struct inode * inode = file->f_path.dentry->d_inode; |
04ff9708 | 2595 | char *p = NULL; |
28a6d671 EB |
2596 | ssize_t length; |
2597 | struct task_struct *task = get_proc_task(inode); | |
2598 | ||
28a6d671 | 2599 | if (!task) |
04ff9708 | 2600 | return -ESRCH; |
28a6d671 EB |
2601 | |
2602 | length = security_getprocattr(task, | |
2fddfeef | 2603 | (char*)file->f_path.dentry->d_name.name, |
04ff9708 | 2604 | &p); |
28a6d671 | 2605 | put_task_struct(task); |
04ff9708 AV |
2606 | if (length > 0) |
2607 | length = simple_read_from_buffer(buf, count, ppos, p, length); | |
2608 | kfree(p); | |
28a6d671 | 2609 | return length; |
1da177e4 LT |
2610 | } |
2611 | ||
28a6d671 EB |
2612 | static ssize_t proc_pid_attr_write(struct file * file, const char __user * buf, |
2613 | size_t count, loff_t *ppos) | |
2614 | { | |
2fddfeef | 2615 | struct inode * inode = file->f_path.dentry->d_inode; |
28a6d671 EB |
2616 | char *page; |
2617 | ssize_t length; | |
2618 | struct task_struct *task = get_proc_task(inode); | |
2619 | ||
2620 | length = -ESRCH; | |
2621 | if (!task) | |
2622 | goto out_no_task; | |
2623 | if (count > PAGE_SIZE) | |
2624 | count = PAGE_SIZE; | |
2625 | ||
2626 | /* No partial writes. */ | |
2627 | length = -EINVAL; | |
2628 | if (*ppos != 0) | |
2629 | goto out; | |
2630 | ||
2631 | length = -ENOMEM; | |
e12ba74d | 2632 | page = (char*)__get_free_page(GFP_TEMPORARY); |
28a6d671 EB |
2633 | if (!page) |
2634 | goto out; | |
2635 | ||
2636 | length = -EFAULT; | |
2637 | if (copy_from_user(page, buf, count)) | |
2638 | goto out_free; | |
2639 | ||
107db7c7 | 2640 | /* Guard against adverse ptrace interaction */ |
9b1bf12d | 2641 | length = mutex_lock_interruptible(&task->signal->cred_guard_mutex); |
107db7c7 DH |
2642 | if (length < 0) |
2643 | goto out_free; | |
2644 | ||
28a6d671 | 2645 | length = security_setprocattr(task, |
2fddfeef | 2646 | (char*)file->f_path.dentry->d_name.name, |
28a6d671 | 2647 | (void*)page, count); |
9b1bf12d | 2648 | mutex_unlock(&task->signal->cred_guard_mutex); |
28a6d671 EB |
2649 | out_free: |
2650 | free_page((unsigned long) page); | |
2651 | out: | |
2652 | put_task_struct(task); | |
2653 | out_no_task: | |
2654 | return length; | |
2655 | } | |
2656 | ||
00977a59 | 2657 | static const struct file_operations proc_pid_attr_operations = { |
28a6d671 EB |
2658 | .read = proc_pid_attr_read, |
2659 | .write = proc_pid_attr_write, | |
87df8424 | 2660 | .llseek = generic_file_llseek, |
28a6d671 EB |
2661 | }; |
2662 | ||
c5141e6d | 2663 | static const struct pid_entry attr_dir_stuff[] = { |
631f9c18 AD |
2664 | REG("current", S_IRUGO|S_IWUGO, proc_pid_attr_operations), |
2665 | REG("prev", S_IRUGO, proc_pid_attr_operations), | |
2666 | REG("exec", S_IRUGO|S_IWUGO, proc_pid_attr_operations), | |
2667 | REG("fscreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations), | |
2668 | REG("keycreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations), | |
2669 | REG("sockcreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations), | |
28a6d671 EB |
2670 | }; |
2671 | ||
72d9dcfc | 2672 | static int proc_attr_dir_readdir(struct file * filp, |
28a6d671 EB |
2673 | void * dirent, filldir_t filldir) |
2674 | { | |
2675 | return proc_pident_readdir(filp,dirent,filldir, | |
72d9dcfc | 2676 | attr_dir_stuff,ARRAY_SIZE(attr_dir_stuff)); |
28a6d671 EB |
2677 | } |
2678 | ||
00977a59 | 2679 | static const struct file_operations proc_attr_dir_operations = { |
1da177e4 | 2680 | .read = generic_read_dir, |
72d9dcfc | 2681 | .readdir = proc_attr_dir_readdir, |
6038f373 | 2682 | .llseek = default_llseek, |
1da177e4 LT |
2683 | }; |
2684 | ||
72d9dcfc | 2685 | static struct dentry *proc_attr_dir_lookup(struct inode *dir, |
28a6d671 EB |
2686 | struct dentry *dentry, struct nameidata *nd) |
2687 | { | |
7bcd6b0e EB |
2688 | return proc_pident_lookup(dir, dentry, |
2689 | attr_dir_stuff, ARRAY_SIZE(attr_dir_stuff)); | |
28a6d671 EB |
2690 | } |
2691 | ||
c5ef1c42 | 2692 | static const struct inode_operations proc_attr_dir_inode_operations = { |
72d9dcfc | 2693 | .lookup = proc_attr_dir_lookup, |
99f89551 | 2694 | .getattr = pid_getattr, |
6d76fa58 | 2695 | .setattr = proc_setattr, |
1da177e4 LT |
2696 | }; |
2697 | ||
28a6d671 EB |
2698 | #endif |
2699 | ||
698ba7b5 | 2700 | #ifdef CONFIG_ELF_CORE |
3cb4a0bb KH |
2701 | static ssize_t proc_coredump_filter_read(struct file *file, char __user *buf, |
2702 | size_t count, loff_t *ppos) | |
2703 | { | |
2704 | struct task_struct *task = get_proc_task(file->f_dentry->d_inode); | |
2705 | struct mm_struct *mm; | |
2706 | char buffer[PROC_NUMBUF]; | |
2707 | size_t len; | |
2708 | int ret; | |
2709 | ||
2710 | if (!task) | |
2711 | return -ESRCH; | |
2712 | ||
2713 | ret = 0; | |
2714 | mm = get_task_mm(task); | |
2715 | if (mm) { | |
2716 | len = snprintf(buffer, sizeof(buffer), "%08lx\n", | |
2717 | ((mm->flags & MMF_DUMP_FILTER_MASK) >> | |
2718 | MMF_DUMP_FILTER_SHIFT)); | |
2719 | mmput(mm); | |
2720 | ret = simple_read_from_buffer(buf, count, ppos, buffer, len); | |
2721 | } | |
2722 | ||
2723 | put_task_struct(task); | |
2724 | ||
2725 | return ret; | |
2726 | } | |
2727 | ||
2728 | static ssize_t proc_coredump_filter_write(struct file *file, | |
2729 | const char __user *buf, | |
2730 | size_t count, | |
2731 | loff_t *ppos) | |
2732 | { | |
2733 | struct task_struct *task; | |
2734 | struct mm_struct *mm; | |
2735 | char buffer[PROC_NUMBUF], *end; | |
2736 | unsigned int val; | |
2737 | int ret; | |
2738 | int i; | |
2739 | unsigned long mask; | |
2740 | ||
2741 | ret = -EFAULT; | |
2742 | memset(buffer, 0, sizeof(buffer)); | |
2743 | if (count > sizeof(buffer) - 1) | |
2744 | count = sizeof(buffer) - 1; | |
2745 | if (copy_from_user(buffer, buf, count)) | |
2746 | goto out_no_task; | |
2747 | ||
2748 | ret = -EINVAL; | |
2749 | val = (unsigned int)simple_strtoul(buffer, &end, 0); | |
2750 | if (*end == '\n') | |
2751 | end++; | |
2752 | if (end - buffer == 0) | |
2753 | goto out_no_task; | |
2754 | ||
2755 | ret = -ESRCH; | |
2756 | task = get_proc_task(file->f_dentry->d_inode); | |
2757 | if (!task) | |
2758 | goto out_no_task; | |
2759 | ||
2760 | ret = end - buffer; | |
2761 | mm = get_task_mm(task); | |
2762 | if (!mm) | |
2763 | goto out_no_mm; | |
2764 | ||
2765 | for (i = 0, mask = 1; i < MMF_DUMP_FILTER_BITS; i++, mask <<= 1) { | |
2766 | if (val & mask) | |
2767 | set_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags); | |
2768 | else | |
2769 | clear_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags); | |
2770 | } | |
2771 | ||
2772 | mmput(mm); | |
2773 | out_no_mm: | |
2774 | put_task_struct(task); | |
2775 | out_no_task: | |
2776 | return ret; | |
2777 | } | |
2778 | ||
2779 | static const struct file_operations proc_coredump_filter_operations = { | |
2780 | .read = proc_coredump_filter_read, | |
2781 | .write = proc_coredump_filter_write, | |
87df8424 | 2782 | .llseek = generic_file_llseek, |
3cb4a0bb KH |
2783 | }; |
2784 | #endif | |
2785 | ||
28a6d671 EB |
2786 | /* |
2787 | * /proc/self: | |
2788 | */ | |
2789 | static int proc_self_readlink(struct dentry *dentry, char __user *buffer, | |
2790 | int buflen) | |
2791 | { | |
488e5bc4 | 2792 | struct pid_namespace *ns = dentry->d_sb->s_fs_info; |
b55fcb22 | 2793 | pid_t tgid = task_tgid_nr_ns(current, ns); |
28a6d671 | 2794 | char tmp[PROC_NUMBUF]; |
b55fcb22 | 2795 | if (!tgid) |
488e5bc4 | 2796 | return -ENOENT; |
b55fcb22 | 2797 | sprintf(tmp, "%d", tgid); |
28a6d671 EB |
2798 | return vfs_readlink(dentry,buffer,buflen,tmp); |
2799 | } | |
2800 | ||
2801 | static void *proc_self_follow_link(struct dentry *dentry, struct nameidata *nd) | |
2802 | { | |
488e5bc4 | 2803 | struct pid_namespace *ns = dentry->d_sb->s_fs_info; |
b55fcb22 | 2804 | pid_t tgid = task_tgid_nr_ns(current, ns); |
7fee4868 AV |
2805 | char *name = ERR_PTR(-ENOENT); |
2806 | if (tgid) { | |
2807 | name = __getname(); | |
2808 | if (!name) | |
2809 | name = ERR_PTR(-ENOMEM); | |
2810 | else | |
2811 | sprintf(name, "%d", tgid); | |
2812 | } | |
2813 | nd_set_link(nd, name); | |
2814 | return NULL; | |
2815 | } | |
2816 | ||
2817 | static void proc_self_put_link(struct dentry *dentry, struct nameidata *nd, | |
2818 | void *cookie) | |
2819 | { | |
2820 | char *s = nd_get_link(nd); | |
2821 | if (!IS_ERR(s)) | |
2822 | __putname(s); | |
28a6d671 EB |
2823 | } |
2824 | ||
c5ef1c42 | 2825 | static const struct inode_operations proc_self_inode_operations = { |
28a6d671 EB |
2826 | .readlink = proc_self_readlink, |
2827 | .follow_link = proc_self_follow_link, | |
7fee4868 | 2828 | .put_link = proc_self_put_link, |
28a6d671 EB |
2829 | }; |
2830 | ||
801199ce EB |
2831 | /* |
2832 | * proc base | |
2833 | * | |
2834 | * These are the directory entries in the root directory of /proc | |
2835 | * that properly belong to the /proc filesystem, as they describe | |
2836 | * describe something that is process related. | |
2837 | */ | |
c5141e6d | 2838 | static const struct pid_entry proc_base_stuff[] = { |
61a28784 | 2839 | NOD("self", S_IFLNK|S_IRWXUGO, |
801199ce | 2840 | &proc_self_inode_operations, NULL, {}), |
801199ce EB |
2841 | }; |
2842 | ||
444ceed8 | 2843 | static struct dentry *proc_base_instantiate(struct inode *dir, |
c5141e6d | 2844 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
801199ce | 2845 | { |
c5141e6d | 2846 | const struct pid_entry *p = ptr; |
801199ce | 2847 | struct inode *inode; |
801199ce | 2848 | struct proc_inode *ei; |
73d36460 | 2849 | struct dentry *error; |
801199ce EB |
2850 | |
2851 | /* Allocate the inode */ | |
2852 | error = ERR_PTR(-ENOMEM); | |
2853 | inode = new_inode(dir->i_sb); | |
2854 | if (!inode) | |
2855 | goto out; | |
2856 | ||
2857 | /* Initialize the inode */ | |
2858 | ei = PROC_I(inode); | |
85fe4025 | 2859 | inode->i_ino = get_next_ino(); |
801199ce | 2860 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; |
801199ce EB |
2861 | |
2862 | /* | |
2863 | * grab the reference to the task. | |
2864 | */ | |
1a657f78 | 2865 | ei->pid = get_task_pid(task, PIDTYPE_PID); |
801199ce EB |
2866 | if (!ei->pid) |
2867 | goto out_iput; | |
2868 | ||
801199ce EB |
2869 | inode->i_mode = p->mode; |
2870 | if (S_ISDIR(inode->i_mode)) | |
bfe86848 | 2871 | set_nlink(inode, 2); |
801199ce EB |
2872 | if (S_ISLNK(inode->i_mode)) |
2873 | inode->i_size = 64; | |
2874 | if (p->iop) | |
2875 | inode->i_op = p->iop; | |
2876 | if (p->fop) | |
2877 | inode->i_fop = p->fop; | |
2878 | ei->op = p->op; | |
801199ce EB |
2879 | d_add(dentry, inode); |
2880 | error = NULL; | |
2881 | out: | |
801199ce EB |
2882 | return error; |
2883 | out_iput: | |
2884 | iput(inode); | |
2885 | goto out; | |
2886 | } | |
2887 | ||
444ceed8 EB |
2888 | static struct dentry *proc_base_lookup(struct inode *dir, struct dentry *dentry) |
2889 | { | |
2890 | struct dentry *error; | |
2891 | struct task_struct *task = get_proc_task(dir); | |
c5141e6d | 2892 | const struct pid_entry *p, *last; |
444ceed8 EB |
2893 | |
2894 | error = ERR_PTR(-ENOENT); | |
2895 | ||
2896 | if (!task) | |
2897 | goto out_no_task; | |
2898 | ||
2899 | /* Lookup the directory entry */ | |
7bcd6b0e EB |
2900 | last = &proc_base_stuff[ARRAY_SIZE(proc_base_stuff) - 1]; |
2901 | for (p = proc_base_stuff; p <= last; p++) { | |
444ceed8 EB |
2902 | if (p->len != dentry->d_name.len) |
2903 | continue; | |
2904 | if (!memcmp(dentry->d_name.name, p->name, p->len)) | |
2905 | break; | |
2906 | } | |
7bcd6b0e | 2907 | if (p > last) |
444ceed8 EB |
2908 | goto out; |
2909 | ||
2910 | error = proc_base_instantiate(dir, dentry, task, p); | |
2911 | ||
2912 | out: | |
2913 | put_task_struct(task); | |
2914 | out_no_task: | |
2915 | return error; | |
2916 | } | |
2917 | ||
c5141e6d ED |
2918 | static int proc_base_fill_cache(struct file *filp, void *dirent, |
2919 | filldir_t filldir, struct task_struct *task, const struct pid_entry *p) | |
61a28784 EB |
2920 | { |
2921 | return proc_fill_cache(filp, dirent, filldir, p->name, p->len, | |
2922 | proc_base_instantiate, task, p); | |
2923 | } | |
2924 | ||
aba76fdb | 2925 | #ifdef CONFIG_TASK_IO_ACCOUNTING |
297c5d92 AR |
2926 | static int do_io_accounting(struct task_struct *task, char *buffer, int whole) |
2927 | { | |
940389b8 | 2928 | struct task_io_accounting acct = task->ioac; |
5995477a | 2929 | unsigned long flags; |
293eb1e7 | 2930 | int result; |
5995477a | 2931 | |
293eb1e7 VK |
2932 | result = mutex_lock_killable(&task->signal->cred_guard_mutex); |
2933 | if (result) | |
2934 | return result; | |
2935 | ||
2936 | if (!ptrace_may_access(task, PTRACE_MODE_READ)) { | |
2937 | result = -EACCES; | |
2938 | goto out_unlock; | |
2939 | } | |
1d1221f3 | 2940 | |
5995477a AR |
2941 | if (whole && lock_task_sighand(task, &flags)) { |
2942 | struct task_struct *t = task; | |
2943 | ||
2944 | task_io_accounting_add(&acct, &task->signal->ioac); | |
2945 | while_each_thread(task, t) | |
2946 | task_io_accounting_add(&acct, &t->ioac); | |
2947 | ||
2948 | unlock_task_sighand(task, &flags); | |
297c5d92 | 2949 | } |
293eb1e7 | 2950 | result = sprintf(buffer, |
aba76fdb AM |
2951 | "rchar: %llu\n" |
2952 | "wchar: %llu\n" | |
2953 | "syscr: %llu\n" | |
2954 | "syscw: %llu\n" | |
2955 | "read_bytes: %llu\n" | |
2956 | "write_bytes: %llu\n" | |
2957 | "cancelled_write_bytes: %llu\n", | |
7c44319d AB |
2958 | (unsigned long long)acct.rchar, |
2959 | (unsigned long long)acct.wchar, | |
2960 | (unsigned long long)acct.syscr, | |
2961 | (unsigned long long)acct.syscw, | |
2962 | (unsigned long long)acct.read_bytes, | |
2963 | (unsigned long long)acct.write_bytes, | |
2964 | (unsigned long long)acct.cancelled_write_bytes); | |
293eb1e7 VK |
2965 | out_unlock: |
2966 | mutex_unlock(&task->signal->cred_guard_mutex); | |
2967 | return result; | |
297c5d92 AR |
2968 | } |
2969 | ||
2970 | static int proc_tid_io_accounting(struct task_struct *task, char *buffer) | |
2971 | { | |
2972 | return do_io_accounting(task, buffer, 0); | |
aba76fdb | 2973 | } |
297c5d92 AR |
2974 | |
2975 | static int proc_tgid_io_accounting(struct task_struct *task, char *buffer) | |
2976 | { | |
2977 | return do_io_accounting(task, buffer, 1); | |
2978 | } | |
2979 | #endif /* CONFIG_TASK_IO_ACCOUNTING */ | |
aba76fdb | 2980 | |
47830723 KC |
2981 | static int proc_pid_personality(struct seq_file *m, struct pid_namespace *ns, |
2982 | struct pid *pid, struct task_struct *task) | |
2983 | { | |
a9712bc1 AV |
2984 | int err = lock_trace(task); |
2985 | if (!err) { | |
2986 | seq_printf(m, "%08x\n", task->personality); | |
2987 | unlock_trace(task); | |
2988 | } | |
2989 | return err; | |
47830723 KC |
2990 | } |
2991 | ||
28a6d671 EB |
2992 | /* |
2993 | * Thread groups | |
2994 | */ | |
00977a59 | 2995 | static const struct file_operations proc_task_operations; |
c5ef1c42 | 2996 | static const struct inode_operations proc_task_inode_operations; |
20cdc894 | 2997 | |
c5141e6d | 2998 | static const struct pid_entry tgid_base_stuff[] = { |
631f9c18 AD |
2999 | DIR("task", S_IRUGO|S_IXUGO, proc_task_inode_operations, proc_task_operations), |
3000 | DIR("fd", S_IRUSR|S_IXUSR, proc_fd_inode_operations, proc_fd_operations), | |
640708a2 PE |
3001 | #ifdef CONFIG_CHECKPOINT_RESTORE |
3002 | DIR("map_files", S_IRUSR|S_IXUSR, proc_map_files_inode_operations, proc_map_files_operations), | |
3003 | #endif | |
631f9c18 | 3004 | DIR("fdinfo", S_IRUSR|S_IXUSR, proc_fdinfo_inode_operations, proc_fdinfo_operations), |
6b4e306a | 3005 | DIR("ns", S_IRUSR|S_IXUGO, proc_ns_dir_inode_operations, proc_ns_dir_operations), |
b2211a36 | 3006 | #ifdef CONFIG_NET |
631f9c18 | 3007 | DIR("net", S_IRUGO|S_IXUGO, proc_net_inode_operations, proc_net_operations), |
b2211a36 | 3008 | #endif |
631f9c18 AD |
3009 | REG("environ", S_IRUSR, proc_environ_operations), |
3010 | INF("auxv", S_IRUSR, proc_pid_auxv), | |
3011 | ONE("status", S_IRUGO, proc_pid_status), | |
a9712bc1 | 3012 | ONE("personality", S_IRUGO, proc_pid_personality), |
3036e7b4 | 3013 | INF("limits", S_IRUGO, proc_pid_limits), |
43ae34cb | 3014 | #ifdef CONFIG_SCHED_DEBUG |
631f9c18 | 3015 | REG("sched", S_IRUGO|S_IWUSR, proc_pid_sched_operations), |
5091faa4 MG |
3016 | #endif |
3017 | #ifdef CONFIG_SCHED_AUTOGROUP | |
3018 | REG("autogroup", S_IRUGO|S_IWUSR, proc_pid_sched_autogroup_operations), | |
ebcb6734 | 3019 | #endif |
4614a696 | 3020 | REG("comm", S_IRUGO|S_IWUSR, proc_pid_set_comm_operations), |
ebcb6734 | 3021 | #ifdef CONFIG_HAVE_ARCH_TRACEHOOK |
a9712bc1 | 3022 | INF("syscall", S_IRUGO, proc_pid_syscall), |
43ae34cb | 3023 | #endif |
631f9c18 AD |
3024 | INF("cmdline", S_IRUGO, proc_pid_cmdline), |
3025 | ONE("stat", S_IRUGO, proc_tgid_stat), | |
3026 | ONE("statm", S_IRUGO, proc_pid_statm), | |
3027 | REG("maps", S_IRUGO, proc_maps_operations), | |
28a6d671 | 3028 | #ifdef CONFIG_NUMA |
631f9c18 | 3029 | REG("numa_maps", S_IRUGO, proc_numa_maps_operations), |
28a6d671 | 3030 | #endif |
631f9c18 AD |
3031 | REG("mem", S_IRUSR|S_IWUSR, proc_mem_operations), |
3032 | LNK("cwd", proc_cwd_link), | |
3033 | LNK("root", proc_root_link), | |
3034 | LNK("exe", proc_exe_link), | |
3035 | REG("mounts", S_IRUGO, proc_mounts_operations), | |
3036 | REG("mountinfo", S_IRUGO, proc_mountinfo_operations), | |
3037 | REG("mountstats", S_IRUSR, proc_mountstats_operations), | |
1e883281 | 3038 | #ifdef CONFIG_PROC_PAGE_MONITOR |
631f9c18 AD |
3039 | REG("clear_refs", S_IWUSR, proc_clear_refs_operations), |
3040 | REG("smaps", S_IRUGO, proc_smaps_operations), | |
ca6b0bf0 | 3041 | REG("pagemap", S_IRUGO, proc_pagemap_operations), |
28a6d671 EB |
3042 | #endif |
3043 | #ifdef CONFIG_SECURITY | |
631f9c18 | 3044 | DIR("attr", S_IRUGO|S_IXUGO, proc_attr_dir_inode_operations, proc_attr_dir_operations), |
28a6d671 EB |
3045 | #endif |
3046 | #ifdef CONFIG_KALLSYMS | |
631f9c18 | 3047 | INF("wchan", S_IRUGO, proc_pid_wchan), |
28a6d671 | 3048 | #endif |
2ec220e2 | 3049 | #ifdef CONFIG_STACKTRACE |
a9712bc1 | 3050 | ONE("stack", S_IRUGO, proc_pid_stack), |
28a6d671 EB |
3051 | #endif |
3052 | #ifdef CONFIG_SCHEDSTATS | |
631f9c18 | 3053 | INF("schedstat", S_IRUGO, proc_pid_schedstat), |
28a6d671 | 3054 | #endif |
9745512c | 3055 | #ifdef CONFIG_LATENCYTOP |
631f9c18 | 3056 | REG("latency", S_IRUGO, proc_lstats_operations), |
9745512c | 3057 | #endif |
8793d854 | 3058 | #ifdef CONFIG_PROC_PID_CPUSET |
631f9c18 | 3059 | REG("cpuset", S_IRUGO, proc_cpuset_operations), |
a424316c PM |
3060 | #endif |
3061 | #ifdef CONFIG_CGROUPS | |
631f9c18 | 3062 | REG("cgroup", S_IRUGO, proc_cgroup_operations), |
28a6d671 | 3063 | #endif |
631f9c18 AD |
3064 | INF("oom_score", S_IRUGO, proc_oom_score), |
3065 | REG("oom_adj", S_IRUGO|S_IWUSR, proc_oom_adjust_operations), | |
a63d83f4 | 3066 | REG("oom_score_adj", S_IRUGO|S_IWUSR, proc_oom_score_adj_operations), |
28a6d671 | 3067 | #ifdef CONFIG_AUDITSYSCALL |
631f9c18 AD |
3068 | REG("loginuid", S_IWUSR|S_IRUGO, proc_loginuid_operations), |
3069 | REG("sessionid", S_IRUGO, proc_sessionid_operations), | |
28a6d671 | 3070 | #endif |
f4f154fd | 3071 | #ifdef CONFIG_FAULT_INJECTION |
631f9c18 | 3072 | REG("make-it-fail", S_IRUGO|S_IWUSR, proc_fault_inject_operations), |
f4f154fd | 3073 | #endif |
698ba7b5 | 3074 | #ifdef CONFIG_ELF_CORE |
631f9c18 | 3075 | REG("coredump_filter", S_IRUGO|S_IWUSR, proc_coredump_filter_operations), |
3cb4a0bb | 3076 | #endif |
aba76fdb | 3077 | #ifdef CONFIG_TASK_IO_ACCOUNTING |
1d1221f3 | 3078 | INF("io", S_IRUSR, proc_tgid_io_accounting), |
aba76fdb | 3079 | #endif |
f133ecca CM |
3080 | #ifdef CONFIG_HARDWALL |
3081 | INF("hardwall", S_IRUGO, proc_pid_hardwall), | |
3082 | #endif | |
28a6d671 | 3083 | }; |
1da177e4 | 3084 | |
28a6d671 | 3085 | static int proc_tgid_base_readdir(struct file * filp, |
1da177e4 LT |
3086 | void * dirent, filldir_t filldir) |
3087 | { | |
3088 | return proc_pident_readdir(filp,dirent,filldir, | |
28a6d671 | 3089 | tgid_base_stuff,ARRAY_SIZE(tgid_base_stuff)); |
1da177e4 LT |
3090 | } |
3091 | ||
00977a59 | 3092 | static const struct file_operations proc_tgid_base_operations = { |
1da177e4 | 3093 | .read = generic_read_dir, |
28a6d671 | 3094 | .readdir = proc_tgid_base_readdir, |
6038f373 | 3095 | .llseek = default_llseek, |
1da177e4 LT |
3096 | }; |
3097 | ||
28a6d671 | 3098 | static struct dentry *proc_tgid_base_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd){ |
7bcd6b0e EB |
3099 | return proc_pident_lookup(dir, dentry, |
3100 | tgid_base_stuff, ARRAY_SIZE(tgid_base_stuff)); | |
1da177e4 LT |
3101 | } |
3102 | ||
c5ef1c42 | 3103 | static const struct inode_operations proc_tgid_base_inode_operations = { |
28a6d671 | 3104 | .lookup = proc_tgid_base_lookup, |
99f89551 | 3105 | .getattr = pid_getattr, |
6d76fa58 | 3106 | .setattr = proc_setattr, |
0499680a | 3107 | .permission = proc_pid_permission, |
1da177e4 | 3108 | }; |
1da177e4 | 3109 | |
60347f67 | 3110 | static void proc_flush_task_mnt(struct vfsmount *mnt, pid_t pid, pid_t tgid) |
1da177e4 | 3111 | { |
48e6484d | 3112 | struct dentry *dentry, *leader, *dir; |
8578cea7 | 3113 | char buf[PROC_NUMBUF]; |
48e6484d EB |
3114 | struct qstr name; |
3115 | ||
3116 | name.name = buf; | |
60347f67 PE |
3117 | name.len = snprintf(buf, sizeof(buf), "%d", pid); |
3118 | dentry = d_hash_and_lookup(mnt->mnt_root, &name); | |
48e6484d | 3119 | if (dentry) { |
29f12ca3 | 3120 | shrink_dcache_parent(dentry); |
48e6484d EB |
3121 | d_drop(dentry); |
3122 | dput(dentry); | |
3123 | } | |
1da177e4 | 3124 | |
48e6484d | 3125 | name.name = buf; |
60347f67 PE |
3126 | name.len = snprintf(buf, sizeof(buf), "%d", tgid); |
3127 | leader = d_hash_and_lookup(mnt->mnt_root, &name); | |
48e6484d EB |
3128 | if (!leader) |
3129 | goto out; | |
1da177e4 | 3130 | |
48e6484d EB |
3131 | name.name = "task"; |
3132 | name.len = strlen(name.name); | |
3133 | dir = d_hash_and_lookup(leader, &name); | |
3134 | if (!dir) | |
3135 | goto out_put_leader; | |
3136 | ||
3137 | name.name = buf; | |
60347f67 | 3138 | name.len = snprintf(buf, sizeof(buf), "%d", pid); |
48e6484d EB |
3139 | dentry = d_hash_and_lookup(dir, &name); |
3140 | if (dentry) { | |
3141 | shrink_dcache_parent(dentry); | |
3142 | d_drop(dentry); | |
3143 | dput(dentry); | |
1da177e4 | 3144 | } |
48e6484d EB |
3145 | |
3146 | dput(dir); | |
3147 | out_put_leader: | |
3148 | dput(leader); | |
3149 | out: | |
3150 | return; | |
1da177e4 LT |
3151 | } |
3152 | ||
0895e91d RD |
3153 | /** |
3154 | * proc_flush_task - Remove dcache entries for @task from the /proc dcache. | |
3155 | * @task: task that should be flushed. | |
3156 | * | |
3157 | * When flushing dentries from proc, one needs to flush them from global | |
60347f67 | 3158 | * proc (proc_mnt) and from all the namespaces' procs this task was seen |
0895e91d RD |
3159 | * in. This call is supposed to do all of this job. |
3160 | * | |
3161 | * Looks in the dcache for | |
3162 | * /proc/@pid | |
3163 | * /proc/@tgid/task/@pid | |
3164 | * if either directory is present flushes it and all of it'ts children | |
3165 | * from the dcache. | |
3166 | * | |
3167 | * It is safe and reasonable to cache /proc entries for a task until | |
3168 | * that task exits. After that they just clog up the dcache with | |
3169 | * useless entries, possibly causing useful dcache entries to be | |
3170 | * flushed instead. This routine is proved to flush those useless | |
3171 | * dcache entries at process exit time. | |
3172 | * | |
3173 | * NOTE: This routine is just an optimization so it does not guarantee | |
3174 | * that no dcache entries will exist at process exit time it | |
3175 | * just makes it very unlikely that any will persist. | |
60347f67 PE |
3176 | */ |
3177 | ||
3178 | void proc_flush_task(struct task_struct *task) | |
3179 | { | |
9fcc2d15 | 3180 | int i; |
9b4d1cbe | 3181 | struct pid *pid, *tgid; |
130f77ec PE |
3182 | struct upid *upid; |
3183 | ||
130f77ec | 3184 | pid = task_pid(task); |
9b4d1cbe | 3185 | tgid = task_tgid(task); |
130f77ec | 3186 | |
9fcc2d15 | 3187 | for (i = 0; i <= pid->level; i++) { |
130f77ec PE |
3188 | upid = &pid->numbers[i]; |
3189 | proc_flush_task_mnt(upid->ns->proc_mnt, upid->nr, | |
9b4d1cbe | 3190 | tgid->numbers[i].nr); |
130f77ec | 3191 | } |
6f4e6433 PE |
3192 | |
3193 | upid = &pid->numbers[pid->level]; | |
3194 | if (upid->nr == 1) | |
3195 | pid_ns_release_proc(upid->ns); | |
60347f67 PE |
3196 | } |
3197 | ||
9711ef99 AB |
3198 | static struct dentry *proc_pid_instantiate(struct inode *dir, |
3199 | struct dentry * dentry, | |
c5141e6d | 3200 | struct task_struct *task, const void *ptr) |
444ceed8 EB |
3201 | { |
3202 | struct dentry *error = ERR_PTR(-ENOENT); | |
3203 | struct inode *inode; | |
3204 | ||
61a28784 | 3205 | inode = proc_pid_make_inode(dir->i_sb, task); |
444ceed8 EB |
3206 | if (!inode) |
3207 | goto out; | |
3208 | ||
3209 | inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO; | |
3210 | inode->i_op = &proc_tgid_base_inode_operations; | |
3211 | inode->i_fop = &proc_tgid_base_operations; | |
3212 | inode->i_flags|=S_IMMUTABLE; | |
aed54175 | 3213 | |
bfe86848 MS |
3214 | set_nlink(inode, 2 + pid_entry_count_dirs(tgid_base_stuff, |
3215 | ARRAY_SIZE(tgid_base_stuff))); | |
444ceed8 | 3216 | |
fb045adb | 3217 | d_set_d_op(dentry, &pid_dentry_operations); |
444ceed8 EB |
3218 | |
3219 | d_add(dentry, inode); | |
3220 | /* Close the race of the process dying before we return the dentry */ | |
3221 | if (pid_revalidate(dentry, NULL)) | |
3222 | error = NULL; | |
3223 | out: | |
3224 | return error; | |
3225 | } | |
3226 | ||
1da177e4 LT |
3227 | struct dentry *proc_pid_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd) |
3228 | { | |
73d36460 | 3229 | struct dentry *result; |
1da177e4 | 3230 | struct task_struct *task; |
1da177e4 | 3231 | unsigned tgid; |
b488893a | 3232 | struct pid_namespace *ns; |
1da177e4 | 3233 | |
801199ce EB |
3234 | result = proc_base_lookup(dir, dentry); |
3235 | if (!IS_ERR(result) || PTR_ERR(result) != -ENOENT) | |
3236 | goto out; | |
3237 | ||
1da177e4 LT |
3238 | tgid = name_to_int(dentry); |
3239 | if (tgid == ~0U) | |
3240 | goto out; | |
3241 | ||
b488893a | 3242 | ns = dentry->d_sb->s_fs_info; |
de758734 | 3243 | rcu_read_lock(); |
b488893a | 3244 | task = find_task_by_pid_ns(tgid, ns); |
1da177e4 LT |
3245 | if (task) |
3246 | get_task_struct(task); | |
de758734 | 3247 | rcu_read_unlock(); |
1da177e4 LT |
3248 | if (!task) |
3249 | goto out; | |
3250 | ||
444ceed8 | 3251 | result = proc_pid_instantiate(dir, dentry, task, NULL); |
1da177e4 | 3252 | put_task_struct(task); |
1da177e4 | 3253 | out: |
cd6a3ce9 | 3254 | return result; |
1da177e4 LT |
3255 | } |
3256 | ||
1da177e4 | 3257 | /* |
0804ef4b | 3258 | * Find the first task with tgid >= tgid |
0bc58a91 | 3259 | * |
1da177e4 | 3260 | */ |
19fd4bb2 EB |
3261 | struct tgid_iter { |
3262 | unsigned int tgid; | |
0804ef4b | 3263 | struct task_struct *task; |
19fd4bb2 EB |
3264 | }; |
3265 | static struct tgid_iter next_tgid(struct pid_namespace *ns, struct tgid_iter iter) | |
3266 | { | |
0804ef4b | 3267 | struct pid *pid; |
1da177e4 | 3268 | |
19fd4bb2 EB |
3269 | if (iter.task) |
3270 | put_task_struct(iter.task); | |
454cc105 | 3271 | rcu_read_lock(); |
0804ef4b | 3272 | retry: |
19fd4bb2 EB |
3273 | iter.task = NULL; |
3274 | pid = find_ge_pid(iter.tgid, ns); | |
0804ef4b | 3275 | if (pid) { |
19fd4bb2 EB |
3276 | iter.tgid = pid_nr_ns(pid, ns); |
3277 | iter.task = pid_task(pid, PIDTYPE_PID); | |
0804ef4b EB |
3278 | /* What we to know is if the pid we have find is the |
3279 | * pid of a thread_group_leader. Testing for task | |
3280 | * being a thread_group_leader is the obvious thing | |
3281 | * todo but there is a window when it fails, due to | |
3282 | * the pid transfer logic in de_thread. | |
3283 | * | |
3284 | * So we perform the straight forward test of seeing | |
3285 | * if the pid we have found is the pid of a thread | |
3286 | * group leader, and don't worry if the task we have | |
3287 | * found doesn't happen to be a thread group leader. | |
3288 | * As we don't care in the case of readdir. | |
3289 | */ | |
19fd4bb2 EB |
3290 | if (!iter.task || !has_group_leader_pid(iter.task)) { |
3291 | iter.tgid += 1; | |
0804ef4b | 3292 | goto retry; |
19fd4bb2 EB |
3293 | } |
3294 | get_task_struct(iter.task); | |
0bc58a91 | 3295 | } |
454cc105 | 3296 | rcu_read_unlock(); |
19fd4bb2 | 3297 | return iter; |
1da177e4 LT |
3298 | } |
3299 | ||
7bcd6b0e | 3300 | #define TGID_OFFSET (FIRST_PROCESS_ENTRY + ARRAY_SIZE(proc_base_stuff)) |
0804ef4b | 3301 | |
61a28784 | 3302 | static int proc_pid_fill_cache(struct file *filp, void *dirent, filldir_t filldir, |
19fd4bb2 | 3303 | struct tgid_iter iter) |
61a28784 EB |
3304 | { |
3305 | char name[PROC_NUMBUF]; | |
19fd4bb2 | 3306 | int len = snprintf(name, sizeof(name), "%d", iter.tgid); |
61a28784 | 3307 | return proc_fill_cache(filp, dirent, filldir, name, len, |
19fd4bb2 | 3308 | proc_pid_instantiate, iter.task, NULL); |
61a28784 EB |
3309 | } |
3310 | ||
0499680a VK |
3311 | static int fake_filldir(void *buf, const char *name, int namelen, |
3312 | loff_t offset, u64 ino, unsigned d_type) | |
3313 | { | |
3314 | return 0; | |
3315 | } | |
3316 | ||
1da177e4 LT |
3317 | /* for the /proc/ directory itself, after non-process stuff has been done */ |
3318 | int proc_pid_readdir(struct file * filp, void * dirent, filldir_t filldir) | |
3319 | { | |
d8bdc59f LT |
3320 | unsigned int nr; |
3321 | struct task_struct *reaper; | |
19fd4bb2 | 3322 | struct tgid_iter iter; |
b488893a | 3323 | struct pid_namespace *ns; |
0499680a | 3324 | filldir_t __filldir; |
1da177e4 | 3325 | |
d8bdc59f LT |
3326 | if (filp->f_pos >= PID_MAX_LIMIT + TGID_OFFSET) |
3327 | goto out_no_task; | |
3328 | nr = filp->f_pos - FIRST_PROCESS_ENTRY; | |
3329 | ||
3330 | reaper = get_proc_task(filp->f_path.dentry->d_inode); | |
61a28784 EB |
3331 | if (!reaper) |
3332 | goto out_no_task; | |
3333 | ||
7bcd6b0e | 3334 | for (; nr < ARRAY_SIZE(proc_base_stuff); filp->f_pos++, nr++) { |
c5141e6d | 3335 | const struct pid_entry *p = &proc_base_stuff[nr]; |
61a28784 | 3336 | if (proc_base_fill_cache(filp, dirent, filldir, reaper, p) < 0) |
801199ce | 3337 | goto out; |
1da177e4 LT |
3338 | } |
3339 | ||
b488893a | 3340 | ns = filp->f_dentry->d_sb->s_fs_info; |
19fd4bb2 EB |
3341 | iter.task = NULL; |
3342 | iter.tgid = filp->f_pos - TGID_OFFSET; | |
3343 | for (iter = next_tgid(ns, iter); | |
3344 | iter.task; | |
3345 | iter.tgid += 1, iter = next_tgid(ns, iter)) { | |
0499680a VK |
3346 | if (has_pid_permissions(ns, iter.task, 2)) |
3347 | __filldir = filldir; | |
3348 | else | |
3349 | __filldir = fake_filldir; | |
3350 | ||
19fd4bb2 | 3351 | filp->f_pos = iter.tgid + TGID_OFFSET; |
0499680a | 3352 | if (proc_pid_fill_cache(filp, dirent, __filldir, iter) < 0) { |
19fd4bb2 | 3353 | put_task_struct(iter.task); |
0804ef4b | 3354 | goto out; |
1da177e4 | 3355 | } |
0bc58a91 | 3356 | } |
0804ef4b EB |
3357 | filp->f_pos = PID_MAX_LIMIT + TGID_OFFSET; |
3358 | out: | |
61a28784 EB |
3359 | put_task_struct(reaper); |
3360 | out_no_task: | |
0bc58a91 EB |
3361 | return 0; |
3362 | } | |
1da177e4 | 3363 | |
28a6d671 EB |
3364 | /* |
3365 | * Tasks | |
3366 | */ | |
c5141e6d | 3367 | static const struct pid_entry tid_base_stuff[] = { |
631f9c18 | 3368 | DIR("fd", S_IRUSR|S_IXUSR, proc_fd_inode_operations, proc_fd_operations), |
3835541d | 3369 | DIR("fdinfo", S_IRUSR|S_IXUSR, proc_fdinfo_inode_operations, proc_fdinfo_operations), |
6b4e306a | 3370 | DIR("ns", S_IRUSR|S_IXUGO, proc_ns_dir_inode_operations, proc_ns_dir_operations), |
631f9c18 AD |
3371 | REG("environ", S_IRUSR, proc_environ_operations), |
3372 | INF("auxv", S_IRUSR, proc_pid_auxv), | |
3373 | ONE("status", S_IRUGO, proc_pid_status), | |
a9712bc1 | 3374 | ONE("personality", S_IRUGO, proc_pid_personality), |
3036e7b4 | 3375 | INF("limits", S_IRUGO, proc_pid_limits), |
43ae34cb | 3376 | #ifdef CONFIG_SCHED_DEBUG |
631f9c18 | 3377 | REG("sched", S_IRUGO|S_IWUSR, proc_pid_sched_operations), |
ebcb6734 | 3378 | #endif |
4614a696 | 3379 | REG("comm", S_IRUGO|S_IWUSR, proc_pid_set_comm_operations), |
ebcb6734 | 3380 | #ifdef CONFIG_HAVE_ARCH_TRACEHOOK |
a9712bc1 | 3381 | INF("syscall", S_IRUGO, proc_pid_syscall), |
43ae34cb | 3382 | #endif |
631f9c18 AD |
3383 | INF("cmdline", S_IRUGO, proc_pid_cmdline), |
3384 | ONE("stat", S_IRUGO, proc_tid_stat), | |
3385 | ONE("statm", S_IRUGO, proc_pid_statm), | |
3386 | REG("maps", S_IRUGO, proc_maps_operations), | |
28a6d671 | 3387 | #ifdef CONFIG_NUMA |
631f9c18 | 3388 | REG("numa_maps", S_IRUGO, proc_numa_maps_operations), |
28a6d671 | 3389 | #endif |
631f9c18 AD |
3390 | REG("mem", S_IRUSR|S_IWUSR, proc_mem_operations), |
3391 | LNK("cwd", proc_cwd_link), | |
3392 | LNK("root", proc_root_link), | |
3393 | LNK("exe", proc_exe_link), | |
3394 | REG("mounts", S_IRUGO, proc_mounts_operations), | |
3395 | REG("mountinfo", S_IRUGO, proc_mountinfo_operations), | |
1e883281 | 3396 | #ifdef CONFIG_PROC_PAGE_MONITOR |
631f9c18 AD |
3397 | REG("clear_refs", S_IWUSR, proc_clear_refs_operations), |
3398 | REG("smaps", S_IRUGO, proc_smaps_operations), | |
ca6b0bf0 | 3399 | REG("pagemap", S_IRUGO, proc_pagemap_operations), |
28a6d671 EB |
3400 | #endif |
3401 | #ifdef CONFIG_SECURITY | |
631f9c18 | 3402 | DIR("attr", S_IRUGO|S_IXUGO, proc_attr_dir_inode_operations, proc_attr_dir_operations), |
28a6d671 EB |
3403 | #endif |
3404 | #ifdef CONFIG_KALLSYMS | |
631f9c18 | 3405 | INF("wchan", S_IRUGO, proc_pid_wchan), |
28a6d671 | 3406 | #endif |
2ec220e2 | 3407 | #ifdef CONFIG_STACKTRACE |
a9712bc1 | 3408 | ONE("stack", S_IRUGO, proc_pid_stack), |
28a6d671 EB |
3409 | #endif |
3410 | #ifdef CONFIG_SCHEDSTATS | |
631f9c18 | 3411 | INF("schedstat", S_IRUGO, proc_pid_schedstat), |
28a6d671 | 3412 | #endif |
9745512c | 3413 | #ifdef CONFIG_LATENCYTOP |
631f9c18 | 3414 | REG("latency", S_IRUGO, proc_lstats_operations), |
9745512c | 3415 | #endif |
8793d854 | 3416 | #ifdef CONFIG_PROC_PID_CPUSET |
631f9c18 | 3417 | REG("cpuset", S_IRUGO, proc_cpuset_operations), |
a424316c PM |
3418 | #endif |
3419 | #ifdef CONFIG_CGROUPS | |
631f9c18 | 3420 | REG("cgroup", S_IRUGO, proc_cgroup_operations), |
28a6d671 | 3421 | #endif |
631f9c18 AD |
3422 | INF("oom_score", S_IRUGO, proc_oom_score), |
3423 | REG("oom_adj", S_IRUGO|S_IWUSR, proc_oom_adjust_operations), | |
a63d83f4 | 3424 | REG("oom_score_adj", S_IRUGO|S_IWUSR, proc_oom_score_adj_operations), |
28a6d671 | 3425 | #ifdef CONFIG_AUDITSYSCALL |
631f9c18 | 3426 | REG("loginuid", S_IWUSR|S_IRUGO, proc_loginuid_operations), |
26ec3c64 | 3427 | REG("sessionid", S_IRUGO, proc_sessionid_operations), |
28a6d671 | 3428 | #endif |
f4f154fd | 3429 | #ifdef CONFIG_FAULT_INJECTION |
631f9c18 | 3430 | REG("make-it-fail", S_IRUGO|S_IWUSR, proc_fault_inject_operations), |
f4f154fd | 3431 | #endif |
297c5d92 | 3432 | #ifdef CONFIG_TASK_IO_ACCOUNTING |
1d1221f3 | 3433 | INF("io", S_IRUSR, proc_tid_io_accounting), |
297c5d92 | 3434 | #endif |
f133ecca CM |
3435 | #ifdef CONFIG_HARDWALL |
3436 | INF("hardwall", S_IRUGO, proc_pid_hardwall), | |
3437 | #endif | |
28a6d671 EB |
3438 | }; |
3439 | ||
3440 | static int proc_tid_base_readdir(struct file * filp, | |
3441 | void * dirent, filldir_t filldir) | |
3442 | { | |
3443 | return proc_pident_readdir(filp,dirent,filldir, | |
3444 | tid_base_stuff,ARRAY_SIZE(tid_base_stuff)); | |
3445 | } | |
3446 | ||
3447 | static struct dentry *proc_tid_base_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd){ | |
7bcd6b0e EB |
3448 | return proc_pident_lookup(dir, dentry, |
3449 | tid_base_stuff, ARRAY_SIZE(tid_base_stuff)); | |
28a6d671 EB |
3450 | } |
3451 | ||
00977a59 | 3452 | static const struct file_operations proc_tid_base_operations = { |
28a6d671 EB |
3453 | .read = generic_read_dir, |
3454 | .readdir = proc_tid_base_readdir, | |
6038f373 | 3455 | .llseek = default_llseek, |
28a6d671 EB |
3456 | }; |
3457 | ||
c5ef1c42 | 3458 | static const struct inode_operations proc_tid_base_inode_operations = { |
28a6d671 EB |
3459 | .lookup = proc_tid_base_lookup, |
3460 | .getattr = pid_getattr, | |
3461 | .setattr = proc_setattr, | |
3462 | }; | |
3463 | ||
444ceed8 | 3464 | static struct dentry *proc_task_instantiate(struct inode *dir, |
c5141e6d | 3465 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
444ceed8 EB |
3466 | { |
3467 | struct dentry *error = ERR_PTR(-ENOENT); | |
3468 | struct inode *inode; | |
61a28784 | 3469 | inode = proc_pid_make_inode(dir->i_sb, task); |
444ceed8 EB |
3470 | |
3471 | if (!inode) | |
3472 | goto out; | |
3473 | inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO; | |
3474 | inode->i_op = &proc_tid_base_inode_operations; | |
3475 | inode->i_fop = &proc_tid_base_operations; | |
3476 | inode->i_flags|=S_IMMUTABLE; | |
aed54175 | 3477 | |
bfe86848 MS |
3478 | set_nlink(inode, 2 + pid_entry_count_dirs(tid_base_stuff, |
3479 | ARRAY_SIZE(tid_base_stuff))); | |
444ceed8 | 3480 | |
fb045adb | 3481 | d_set_d_op(dentry, &pid_dentry_operations); |
444ceed8 EB |
3482 | |
3483 | d_add(dentry, inode); | |
3484 | /* Close the race of the process dying before we return the dentry */ | |
3485 | if (pid_revalidate(dentry, NULL)) | |
3486 | error = NULL; | |
3487 | out: | |
3488 | return error; | |
3489 | } | |
3490 | ||
28a6d671 EB |
3491 | static struct dentry *proc_task_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd) |
3492 | { | |
3493 | struct dentry *result = ERR_PTR(-ENOENT); | |
3494 | struct task_struct *task; | |
3495 | struct task_struct *leader = get_proc_task(dir); | |
28a6d671 | 3496 | unsigned tid; |
b488893a | 3497 | struct pid_namespace *ns; |
28a6d671 EB |
3498 | |
3499 | if (!leader) | |
3500 | goto out_no_task; | |
3501 | ||
3502 | tid = name_to_int(dentry); | |
3503 | if (tid == ~0U) | |
3504 | goto out; | |
3505 | ||
b488893a | 3506 | ns = dentry->d_sb->s_fs_info; |
28a6d671 | 3507 | rcu_read_lock(); |
b488893a | 3508 | task = find_task_by_pid_ns(tid, ns); |
28a6d671 EB |
3509 | if (task) |
3510 | get_task_struct(task); | |
3511 | rcu_read_unlock(); | |
3512 | if (!task) | |
3513 | goto out; | |
bac0abd6 | 3514 | if (!same_thread_group(leader, task)) |
28a6d671 EB |
3515 | goto out_drop_task; |
3516 | ||
444ceed8 | 3517 | result = proc_task_instantiate(dir, dentry, task, NULL); |
28a6d671 EB |
3518 | out_drop_task: |
3519 | put_task_struct(task); | |
3520 | out: | |
3521 | put_task_struct(leader); | |
3522 | out_no_task: | |
3523 | return result; | |
3524 | } | |
3525 | ||
0bc58a91 EB |
3526 | /* |
3527 | * Find the first tid of a thread group to return to user space. | |
3528 | * | |
3529 | * Usually this is just the thread group leader, but if the users | |
3530 | * buffer was too small or there was a seek into the middle of the | |
3531 | * directory we have more work todo. | |
3532 | * | |
3533 | * In the case of a short read we start with find_task_by_pid. | |
3534 | * | |
3535 | * In the case of a seek we start with the leader and walk nr | |
3536 | * threads past it. | |
3537 | */ | |
cc288738 | 3538 | static struct task_struct *first_tid(struct task_struct *leader, |
b488893a | 3539 | int tid, int nr, struct pid_namespace *ns) |
0bc58a91 | 3540 | { |
a872ff0c | 3541 | struct task_struct *pos; |
1da177e4 | 3542 | |
cc288738 | 3543 | rcu_read_lock(); |
0bc58a91 EB |
3544 | /* Attempt to start with the pid of a thread */ |
3545 | if (tid && (nr > 0)) { | |
b488893a | 3546 | pos = find_task_by_pid_ns(tid, ns); |
a872ff0c ON |
3547 | if (pos && (pos->group_leader == leader)) |
3548 | goto found; | |
0bc58a91 | 3549 | } |
1da177e4 | 3550 | |
0bc58a91 | 3551 | /* If nr exceeds the number of threads there is nothing todo */ |
a872ff0c ON |
3552 | pos = NULL; |
3553 | if (nr && nr >= get_nr_threads(leader)) | |
3554 | goto out; | |
1da177e4 | 3555 | |
a872ff0c ON |
3556 | /* If we haven't found our starting place yet start |
3557 | * with the leader and walk nr threads forward. | |
0bc58a91 | 3558 | */ |
a872ff0c ON |
3559 | for (pos = leader; nr > 0; --nr) { |
3560 | pos = next_thread(pos); | |
3561 | if (pos == leader) { | |
3562 | pos = NULL; | |
3563 | goto out; | |
3564 | } | |
1da177e4 | 3565 | } |
a872ff0c ON |
3566 | found: |
3567 | get_task_struct(pos); | |
3568 | out: | |
cc288738 | 3569 | rcu_read_unlock(); |
0bc58a91 EB |
3570 | return pos; |
3571 | } | |
3572 | ||
3573 | /* | |
3574 | * Find the next thread in the thread list. | |
3575 | * Return NULL if there is an error or no next thread. | |
3576 | * | |
3577 | * The reference to the input task_struct is released. | |
3578 | */ | |
3579 | static struct task_struct *next_tid(struct task_struct *start) | |
3580 | { | |
c1df7fb8 | 3581 | struct task_struct *pos = NULL; |
cc288738 | 3582 | rcu_read_lock(); |
c1df7fb8 | 3583 | if (pid_alive(start)) { |
0bc58a91 | 3584 | pos = next_thread(start); |
c1df7fb8 ON |
3585 | if (thread_group_leader(pos)) |
3586 | pos = NULL; | |
3587 | else | |
3588 | get_task_struct(pos); | |
3589 | } | |
cc288738 | 3590 | rcu_read_unlock(); |
0bc58a91 EB |
3591 | put_task_struct(start); |
3592 | return pos; | |
1da177e4 LT |
3593 | } |
3594 | ||
61a28784 EB |
3595 | static int proc_task_fill_cache(struct file *filp, void *dirent, filldir_t filldir, |
3596 | struct task_struct *task, int tid) | |
3597 | { | |
3598 | char name[PROC_NUMBUF]; | |
3599 | int len = snprintf(name, sizeof(name), "%d", tid); | |
3600 | return proc_fill_cache(filp, dirent, filldir, name, len, | |
3601 | proc_task_instantiate, task, NULL); | |
3602 | } | |
3603 | ||
1da177e4 LT |
3604 | /* for the /proc/TGID/task/ directories */ |
3605 | static int proc_task_readdir(struct file * filp, void * dirent, filldir_t filldir) | |
3606 | { | |
2fddfeef | 3607 | struct dentry *dentry = filp->f_path.dentry; |
1da177e4 | 3608 | struct inode *inode = dentry->d_inode; |
7d895244 | 3609 | struct task_struct *leader = NULL; |
0bc58a91 | 3610 | struct task_struct *task; |
1da177e4 LT |
3611 | int retval = -ENOENT; |
3612 | ino_t ino; | |
0bc58a91 | 3613 | int tid; |
b488893a | 3614 | struct pid_namespace *ns; |
1da177e4 | 3615 | |
7d895244 GC |
3616 | task = get_proc_task(inode); |
3617 | if (!task) | |
3618 | goto out_no_task; | |
3619 | rcu_read_lock(); | |
3620 | if (pid_alive(task)) { | |
3621 | leader = task->group_leader; | |
3622 | get_task_struct(leader); | |
3623 | } | |
3624 | rcu_read_unlock(); | |
3625 | put_task_struct(task); | |
99f89551 EB |
3626 | if (!leader) |
3627 | goto out_no_task; | |
1da177e4 LT |
3628 | retval = 0; |
3629 | ||
ee568b25 | 3630 | switch ((unsigned long)filp->f_pos) { |
1da177e4 LT |
3631 | case 0: |
3632 | ino = inode->i_ino; | |
ee6f779b | 3633 | if (filldir(dirent, ".", 1, filp->f_pos, ino, DT_DIR) < 0) |
1da177e4 | 3634 | goto out; |
ee6f779b | 3635 | filp->f_pos++; |
1da177e4 LT |
3636 | /* fall through */ |
3637 | case 1: | |
3638 | ino = parent_ino(dentry); | |
ee6f779b | 3639 | if (filldir(dirent, "..", 2, filp->f_pos, ino, DT_DIR) < 0) |
1da177e4 | 3640 | goto out; |
ee6f779b | 3641 | filp->f_pos++; |
1da177e4 LT |
3642 | /* fall through */ |
3643 | } | |
3644 | ||
0bc58a91 EB |
3645 | /* f_version caches the tgid value that the last readdir call couldn't |
3646 | * return. lseek aka telldir automagically resets f_version to 0. | |
3647 | */ | |
b488893a | 3648 | ns = filp->f_dentry->d_sb->s_fs_info; |
2b47c361 | 3649 | tid = (int)filp->f_version; |
0bc58a91 | 3650 | filp->f_version = 0; |
ee6f779b | 3651 | for (task = first_tid(leader, tid, filp->f_pos - 2, ns); |
0bc58a91 | 3652 | task; |
ee6f779b | 3653 | task = next_tid(task), filp->f_pos++) { |
b488893a | 3654 | tid = task_pid_nr_ns(task, ns); |
61a28784 | 3655 | if (proc_task_fill_cache(filp, dirent, filldir, task, tid) < 0) { |
0bc58a91 EB |
3656 | /* returning this tgid failed, save it as the first |
3657 | * pid for the next readir call */ | |
2b47c361 | 3658 | filp->f_version = (u64)tid; |
0bc58a91 | 3659 | put_task_struct(task); |
1da177e4 | 3660 | break; |
0bc58a91 | 3661 | } |
1da177e4 LT |
3662 | } |
3663 | out: | |
99f89551 EB |
3664 | put_task_struct(leader); |
3665 | out_no_task: | |
1da177e4 LT |
3666 | return retval; |
3667 | } | |
6e66b52b EB |
3668 | |
3669 | static int proc_task_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) | |
3670 | { | |
3671 | struct inode *inode = dentry->d_inode; | |
99f89551 | 3672 | struct task_struct *p = get_proc_task(inode); |
6e66b52b EB |
3673 | generic_fillattr(inode, stat); |
3674 | ||
99f89551 | 3675 | if (p) { |
99f89551 | 3676 | stat->nlink += get_nr_threads(p); |
99f89551 | 3677 | put_task_struct(p); |
6e66b52b EB |
3678 | } |
3679 | ||
3680 | return 0; | |
3681 | } | |
28a6d671 | 3682 | |
c5ef1c42 | 3683 | static const struct inode_operations proc_task_inode_operations = { |
28a6d671 EB |
3684 | .lookup = proc_task_lookup, |
3685 | .getattr = proc_task_getattr, | |
3686 | .setattr = proc_setattr, | |
0499680a | 3687 | .permission = proc_pid_permission, |
28a6d671 EB |
3688 | }; |
3689 | ||
00977a59 | 3690 | static const struct file_operations proc_task_operations = { |
28a6d671 EB |
3691 | .read = generic_read_dir, |
3692 | .readdir = proc_task_readdir, | |
6038f373 | 3693 | .llseek = default_llseek, |
28a6d671 | 3694 | }; |