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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> |
22d917d8 | 84 | #include <linux/user_namespace.h> |
5ad4e53b | 85 | #include <linux/fs_struct.h> |
5a0e3ad6 | 86 | #include <linux/slab.h> |
640708a2 | 87 | #include <linux/flex_array.h> |
f133ecca CM |
88 | #ifdef CONFIG_HARDWALL |
89 | #include <asm/hardwall.h> | |
90 | #endif | |
43d2b113 | 91 | #include <trace/events/oom.h> |
1da177e4 LT |
92 | #include "internal.h" |
93 | ||
0f2fe20f EB |
94 | /* NOTE: |
95 | * Implementing inode permission operations in /proc is almost | |
96 | * certainly an error. Permission checks need to happen during | |
97 | * each system call not at open time. The reason is that most of | |
98 | * what we wish to check for permissions in /proc varies at runtime. | |
99 | * | |
100 | * The classic example of a problem is opening file descriptors | |
101 | * in /proc for a task before it execs a suid executable. | |
102 | */ | |
103 | ||
1da177e4 | 104 | struct pid_entry { |
1da177e4 | 105 | char *name; |
c5141e6d | 106 | int len; |
d161a13f | 107 | umode_t mode; |
c5ef1c42 | 108 | const struct inode_operations *iop; |
00977a59 | 109 | const struct file_operations *fop; |
20cdc894 | 110 | union proc_op op; |
1da177e4 LT |
111 | }; |
112 | ||
61a28784 | 113 | #define NOD(NAME, MODE, IOP, FOP, OP) { \ |
20cdc894 | 114 | .name = (NAME), \ |
c5141e6d | 115 | .len = sizeof(NAME) - 1, \ |
20cdc894 EB |
116 | .mode = MODE, \ |
117 | .iop = IOP, \ | |
118 | .fop = FOP, \ | |
119 | .op = OP, \ | |
120 | } | |
121 | ||
631f9c18 AD |
122 | #define DIR(NAME, MODE, iops, fops) \ |
123 | NOD(NAME, (S_IFDIR|(MODE)), &iops, &fops, {} ) | |
124 | #define LNK(NAME, get_link) \ | |
61a28784 | 125 | NOD(NAME, (S_IFLNK|S_IRWXUGO), \ |
20cdc894 | 126 | &proc_pid_link_inode_operations, NULL, \ |
631f9c18 AD |
127 | { .proc_get_link = get_link } ) |
128 | #define REG(NAME, MODE, fops) \ | |
129 | NOD(NAME, (S_IFREG|(MODE)), NULL, &fops, {}) | |
130 | #define INF(NAME, MODE, read) \ | |
61a28784 | 131 | NOD(NAME, (S_IFREG|(MODE)), \ |
20cdc894 | 132 | NULL, &proc_info_file_operations, \ |
631f9c18 AD |
133 | { .proc_read = read } ) |
134 | #define ONE(NAME, MODE, show) \ | |
be614086 EB |
135 | NOD(NAME, (S_IFREG|(MODE)), \ |
136 | NULL, &proc_single_file_operations, \ | |
631f9c18 | 137 | { .proc_show = show } ) |
1da177e4 | 138 | |
640708a2 PE |
139 | static int proc_fd_permission(struct inode *inode, int mask); |
140 | ||
aed54175 VN |
141 | /* |
142 | * Count the number of hardlinks for the pid_entry table, excluding the . | |
143 | * and .. links. | |
144 | */ | |
145 | static unsigned int pid_entry_count_dirs(const struct pid_entry *entries, | |
146 | unsigned int n) | |
147 | { | |
148 | unsigned int i; | |
149 | unsigned int count; | |
150 | ||
151 | count = 0; | |
152 | for (i = 0; i < n; ++i) { | |
153 | if (S_ISDIR(entries[i].mode)) | |
154 | ++count; | |
155 | } | |
156 | ||
157 | return count; | |
158 | } | |
159 | ||
f7ad3c6b | 160 | static int get_task_root(struct task_struct *task, struct path *root) |
1da177e4 | 161 | { |
7c2c7d99 HD |
162 | int result = -ENOENT; |
163 | ||
0494f6ec | 164 | task_lock(task); |
f7ad3c6b MS |
165 | if (task->fs) { |
166 | get_fs_root(task->fs, root); | |
7c2c7d99 HD |
167 | result = 0; |
168 | } | |
0494f6ec | 169 | task_unlock(task); |
7c2c7d99 | 170 | return result; |
0494f6ec MS |
171 | } |
172 | ||
7773fbc5 | 173 | static int proc_cwd_link(struct dentry *dentry, struct path *path) |
0494f6ec | 174 | { |
7773fbc5 | 175 | struct task_struct *task = get_proc_task(dentry->d_inode); |
0494f6ec | 176 | int result = -ENOENT; |
99f89551 EB |
177 | |
178 | if (task) { | |
f7ad3c6b MS |
179 | task_lock(task); |
180 | if (task->fs) { | |
181 | get_fs_pwd(task->fs, path); | |
182 | result = 0; | |
183 | } | |
184 | task_unlock(task); | |
99f89551 EB |
185 | put_task_struct(task); |
186 | } | |
1da177e4 LT |
187 | return result; |
188 | } | |
189 | ||
7773fbc5 | 190 | static int proc_root_link(struct dentry *dentry, struct path *path) |
1da177e4 | 191 | { |
7773fbc5 | 192 | struct task_struct *task = get_proc_task(dentry->d_inode); |
1da177e4 | 193 | int result = -ENOENT; |
99f89551 EB |
194 | |
195 | if (task) { | |
f7ad3c6b | 196 | result = get_task_root(task, path); |
99f89551 EB |
197 | put_task_struct(task); |
198 | } | |
1da177e4 LT |
199 | return result; |
200 | } | |
201 | ||
1da177e4 LT |
202 | static int proc_pid_cmdline(struct task_struct *task, char * buffer) |
203 | { | |
204 | int res = 0; | |
205 | unsigned int len; | |
206 | struct mm_struct *mm = get_task_mm(task); | |
207 | if (!mm) | |
208 | goto out; | |
209 | if (!mm->arg_end) | |
210 | goto out_mm; /* Shh! No looking before we're done */ | |
211 | ||
212 | len = mm->arg_end - mm->arg_start; | |
213 | ||
214 | if (len > PAGE_SIZE) | |
215 | len = PAGE_SIZE; | |
216 | ||
217 | res = access_process_vm(task, mm->arg_start, buffer, len, 0); | |
218 | ||
219 | // If the nul at the end of args has been overwritten, then | |
220 | // assume application is using setproctitle(3). | |
221 | if (res > 0 && buffer[res-1] != '\0' && len < PAGE_SIZE) { | |
222 | len = strnlen(buffer, res); | |
223 | if (len < res) { | |
224 | res = len; | |
225 | } else { | |
226 | len = mm->env_end - mm->env_start; | |
227 | if (len > PAGE_SIZE - res) | |
228 | len = PAGE_SIZE - res; | |
229 | res += access_process_vm(task, mm->env_start, buffer+res, len, 0); | |
230 | res = strnlen(buffer, res); | |
231 | } | |
232 | } | |
233 | out_mm: | |
234 | mmput(mm); | |
235 | out: | |
236 | return res; | |
237 | } | |
238 | ||
239 | static int proc_pid_auxv(struct task_struct *task, char *buffer) | |
240 | { | |
e7dcd999 | 241 | struct mm_struct *mm = mm_access(task, PTRACE_MODE_READ); |
2fadaef4 AV |
242 | int res = PTR_ERR(mm); |
243 | if (mm && !IS_ERR(mm)) { | |
1da177e4 | 244 | unsigned int nwords = 0; |
dfe6b7d9 | 245 | do { |
1da177e4 | 246 | nwords += 2; |
dfe6b7d9 | 247 | } while (mm->saved_auxv[nwords - 2] != 0); /* AT_NULL */ |
1da177e4 LT |
248 | res = nwords * sizeof(mm->saved_auxv[0]); |
249 | if (res > PAGE_SIZE) | |
250 | res = PAGE_SIZE; | |
251 | memcpy(buffer, mm->saved_auxv, res); | |
252 | mmput(mm); | |
253 | } | |
254 | return res; | |
255 | } | |
256 | ||
257 | ||
258 | #ifdef CONFIG_KALLSYMS | |
259 | /* | |
260 | * Provides a wchan file via kallsyms in a proper one-value-per-file format. | |
261 | * Returns the resolved symbol. If that fails, simply return the address. | |
262 | */ | |
263 | static int proc_pid_wchan(struct task_struct *task, char *buffer) | |
264 | { | |
ffb45122 | 265 | unsigned long wchan; |
9281acea | 266 | char symname[KSYM_NAME_LEN]; |
1da177e4 LT |
267 | |
268 | wchan = get_wchan(task); | |
269 | ||
9d65cb4a | 270 | if (lookup_symbol_name(wchan, symname) < 0) |
f83ce3e6 JE |
271 | if (!ptrace_may_access(task, PTRACE_MODE_READ)) |
272 | return 0; | |
273 | else | |
274 | return sprintf(buffer, "%lu", wchan); | |
9d65cb4a AD |
275 | else |
276 | return sprintf(buffer, "%s", symname); | |
1da177e4 LT |
277 | } |
278 | #endif /* CONFIG_KALLSYMS */ | |
279 | ||
a9712bc1 AV |
280 | static int lock_trace(struct task_struct *task) |
281 | { | |
282 | int err = mutex_lock_killable(&task->signal->cred_guard_mutex); | |
283 | if (err) | |
284 | return err; | |
285 | if (!ptrace_may_access(task, PTRACE_MODE_ATTACH)) { | |
286 | mutex_unlock(&task->signal->cred_guard_mutex); | |
287 | return -EPERM; | |
288 | } | |
289 | return 0; | |
290 | } | |
291 | ||
292 | static void unlock_trace(struct task_struct *task) | |
293 | { | |
294 | mutex_unlock(&task->signal->cred_guard_mutex); | |
295 | } | |
296 | ||
2ec220e2 KC |
297 | #ifdef CONFIG_STACKTRACE |
298 | ||
299 | #define MAX_STACK_TRACE_DEPTH 64 | |
300 | ||
301 | static int proc_pid_stack(struct seq_file *m, struct pid_namespace *ns, | |
302 | struct pid *pid, struct task_struct *task) | |
303 | { | |
304 | struct stack_trace trace; | |
305 | unsigned long *entries; | |
a9712bc1 | 306 | int err; |
2ec220e2 KC |
307 | int i; |
308 | ||
309 | entries = kmalloc(MAX_STACK_TRACE_DEPTH * sizeof(*entries), GFP_KERNEL); | |
310 | if (!entries) | |
311 | return -ENOMEM; | |
312 | ||
313 | trace.nr_entries = 0; | |
314 | trace.max_entries = MAX_STACK_TRACE_DEPTH; | |
315 | trace.entries = entries; | |
316 | trace.skip = 0; | |
2ec220e2 | 317 | |
a9712bc1 AV |
318 | err = lock_trace(task); |
319 | if (!err) { | |
320 | save_stack_trace_tsk(task, &trace); | |
321 | ||
322 | for (i = 0; i < trace.nr_entries; i++) { | |
b81a618d | 323 | seq_printf(m, "[<%pK>] %pS\n", |
a9712bc1 AV |
324 | (void *)entries[i], (void *)entries[i]); |
325 | } | |
326 | unlock_trace(task); | |
2ec220e2 KC |
327 | } |
328 | kfree(entries); | |
329 | ||
a9712bc1 | 330 | return err; |
2ec220e2 KC |
331 | } |
332 | #endif | |
333 | ||
1da177e4 LT |
334 | #ifdef CONFIG_SCHEDSTATS |
335 | /* | |
336 | * Provides /proc/PID/schedstat | |
337 | */ | |
338 | static int proc_pid_schedstat(struct task_struct *task, char *buffer) | |
339 | { | |
172ba844 | 340 | return sprintf(buffer, "%llu %llu %lu\n", |
826e08b0 IM |
341 | (unsigned long long)task->se.sum_exec_runtime, |
342 | (unsigned long long)task->sched_info.run_delay, | |
2d72376b | 343 | task->sched_info.pcount); |
1da177e4 LT |
344 | } |
345 | #endif | |
346 | ||
9745512c AV |
347 | #ifdef CONFIG_LATENCYTOP |
348 | static int lstats_show_proc(struct seq_file *m, void *v) | |
349 | { | |
350 | int i; | |
13d77c37 HS |
351 | struct inode *inode = m->private; |
352 | struct task_struct *task = get_proc_task(inode); | |
9745512c | 353 | |
13d77c37 HS |
354 | if (!task) |
355 | return -ESRCH; | |
356 | seq_puts(m, "Latency Top version : v0.1\n"); | |
9745512c | 357 | for (i = 0; i < 32; i++) { |
34e49d4f JP |
358 | struct latency_record *lr = &task->latency_record[i]; |
359 | if (lr->backtrace[0]) { | |
9745512c | 360 | int q; |
34e49d4f JP |
361 | seq_printf(m, "%i %li %li", |
362 | lr->count, lr->time, lr->max); | |
9745512c | 363 | for (q = 0; q < LT_BACKTRACEDEPTH; q++) { |
34e49d4f JP |
364 | unsigned long bt = lr->backtrace[q]; |
365 | if (!bt) | |
9745512c | 366 | break; |
34e49d4f | 367 | if (bt == ULONG_MAX) |
9745512c | 368 | break; |
34e49d4f | 369 | seq_printf(m, " %ps", (void *)bt); |
9745512c | 370 | } |
9d6de12f | 371 | seq_putc(m, '\n'); |
9745512c AV |
372 | } |
373 | ||
374 | } | |
13d77c37 | 375 | put_task_struct(task); |
9745512c AV |
376 | return 0; |
377 | } | |
378 | ||
379 | static int lstats_open(struct inode *inode, struct file *file) | |
380 | { | |
13d77c37 | 381 | return single_open(file, lstats_show_proc, inode); |
d6643d12 HS |
382 | } |
383 | ||
9745512c AV |
384 | static ssize_t lstats_write(struct file *file, const char __user *buf, |
385 | size_t count, loff_t *offs) | |
386 | { | |
13d77c37 | 387 | struct task_struct *task = get_proc_task(file->f_dentry->d_inode); |
9745512c | 388 | |
13d77c37 HS |
389 | if (!task) |
390 | return -ESRCH; | |
9745512c | 391 | clear_all_latency_tracing(task); |
13d77c37 | 392 | put_task_struct(task); |
9745512c AV |
393 | |
394 | return count; | |
395 | } | |
396 | ||
397 | static const struct file_operations proc_lstats_operations = { | |
398 | .open = lstats_open, | |
399 | .read = seq_read, | |
400 | .write = lstats_write, | |
401 | .llseek = seq_lseek, | |
13d77c37 | 402 | .release = single_release, |
9745512c AV |
403 | }; |
404 | ||
405 | #endif | |
406 | ||
1da177e4 LT |
407 | static int proc_oom_score(struct task_struct *task, char *buffer) |
408 | { | |
a7f638f9 | 409 | unsigned long totalpages = totalram_pages + total_swap_pages; |
b95c35e7 | 410 | unsigned long points = 0; |
1da177e4 | 411 | |
19c5d45a | 412 | read_lock(&tasklist_lock); |
b95c35e7 | 413 | if (pid_alive(task)) |
a7f638f9 DR |
414 | points = oom_badness(task, NULL, NULL, totalpages) * |
415 | 1000 / totalpages; | |
19c5d45a | 416 | read_unlock(&tasklist_lock); |
1da177e4 LT |
417 | return sprintf(buffer, "%lu\n", points); |
418 | } | |
419 | ||
d85f50d5 NH |
420 | struct limit_names { |
421 | char *name; | |
422 | char *unit; | |
423 | }; | |
424 | ||
425 | static const struct limit_names lnames[RLIM_NLIMITS] = { | |
cff4edb5 | 426 | [RLIMIT_CPU] = {"Max cpu time", "seconds"}, |
d85f50d5 NH |
427 | [RLIMIT_FSIZE] = {"Max file size", "bytes"}, |
428 | [RLIMIT_DATA] = {"Max data size", "bytes"}, | |
429 | [RLIMIT_STACK] = {"Max stack size", "bytes"}, | |
430 | [RLIMIT_CORE] = {"Max core file size", "bytes"}, | |
431 | [RLIMIT_RSS] = {"Max resident set", "bytes"}, | |
432 | [RLIMIT_NPROC] = {"Max processes", "processes"}, | |
433 | [RLIMIT_NOFILE] = {"Max open files", "files"}, | |
434 | [RLIMIT_MEMLOCK] = {"Max locked memory", "bytes"}, | |
435 | [RLIMIT_AS] = {"Max address space", "bytes"}, | |
436 | [RLIMIT_LOCKS] = {"Max file locks", "locks"}, | |
437 | [RLIMIT_SIGPENDING] = {"Max pending signals", "signals"}, | |
438 | [RLIMIT_MSGQUEUE] = {"Max msgqueue size", "bytes"}, | |
439 | [RLIMIT_NICE] = {"Max nice priority", NULL}, | |
440 | [RLIMIT_RTPRIO] = {"Max realtime priority", NULL}, | |
8808117c | 441 | [RLIMIT_RTTIME] = {"Max realtime timeout", "us"}, |
d85f50d5 NH |
442 | }; |
443 | ||
444 | /* Display limits for a process */ | |
445 | static int proc_pid_limits(struct task_struct *task, char *buffer) | |
446 | { | |
447 | unsigned int i; | |
448 | int count = 0; | |
449 | unsigned long flags; | |
450 | char *bufptr = buffer; | |
451 | ||
452 | struct rlimit rlim[RLIM_NLIMITS]; | |
453 | ||
a6bebbc8 | 454 | if (!lock_task_sighand(task, &flags)) |
d85f50d5 | 455 | return 0; |
d85f50d5 NH |
456 | memcpy(rlim, task->signal->rlim, sizeof(struct rlimit) * RLIM_NLIMITS); |
457 | unlock_task_sighand(task, &flags); | |
d85f50d5 NH |
458 | |
459 | /* | |
460 | * print the file header | |
461 | */ | |
462 | count += sprintf(&bufptr[count], "%-25s %-20s %-20s %-10s\n", | |
463 | "Limit", "Soft Limit", "Hard Limit", "Units"); | |
464 | ||
465 | for (i = 0; i < RLIM_NLIMITS; i++) { | |
466 | if (rlim[i].rlim_cur == RLIM_INFINITY) | |
467 | count += sprintf(&bufptr[count], "%-25s %-20s ", | |
468 | lnames[i].name, "unlimited"); | |
469 | else | |
470 | count += sprintf(&bufptr[count], "%-25s %-20lu ", | |
471 | lnames[i].name, rlim[i].rlim_cur); | |
472 | ||
473 | if (rlim[i].rlim_max == RLIM_INFINITY) | |
474 | count += sprintf(&bufptr[count], "%-20s ", "unlimited"); | |
475 | else | |
476 | count += sprintf(&bufptr[count], "%-20lu ", | |
477 | rlim[i].rlim_max); | |
478 | ||
479 | if (lnames[i].unit) | |
480 | count += sprintf(&bufptr[count], "%-10s\n", | |
481 | lnames[i].unit); | |
482 | else | |
483 | count += sprintf(&bufptr[count], "\n"); | |
484 | } | |
485 | ||
486 | return count; | |
487 | } | |
488 | ||
ebcb6734 RM |
489 | #ifdef CONFIG_HAVE_ARCH_TRACEHOOK |
490 | static int proc_pid_syscall(struct task_struct *task, char *buffer) | |
491 | { | |
492 | long nr; | |
493 | unsigned long args[6], sp, pc; | |
a9712bc1 AV |
494 | int res = lock_trace(task); |
495 | if (res) | |
496 | return res; | |
ebcb6734 RM |
497 | |
498 | if (task_current_syscall(task, &nr, args, 6, &sp, &pc)) | |
a9712bc1 AV |
499 | res = sprintf(buffer, "running\n"); |
500 | else if (nr < 0) | |
501 | res = sprintf(buffer, "%ld 0x%lx 0x%lx\n", nr, sp, pc); | |
502 | else | |
503 | res = sprintf(buffer, | |
ebcb6734 RM |
504 | "%ld 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx\n", |
505 | nr, | |
506 | args[0], args[1], args[2], args[3], args[4], args[5], | |
507 | sp, pc); | |
a9712bc1 AV |
508 | unlock_trace(task); |
509 | return res; | |
ebcb6734 RM |
510 | } |
511 | #endif /* CONFIG_HAVE_ARCH_TRACEHOOK */ | |
512 | ||
1da177e4 LT |
513 | /************************************************************************/ |
514 | /* Here the fs part begins */ | |
515 | /************************************************************************/ | |
516 | ||
517 | /* permission checks */ | |
778c1144 | 518 | static int proc_fd_access_allowed(struct inode *inode) |
1da177e4 | 519 | { |
778c1144 EB |
520 | struct task_struct *task; |
521 | int allowed = 0; | |
df26c40e EB |
522 | /* Allow access to a task's file descriptors if it is us or we |
523 | * may use ptrace attach to the process and find out that | |
524 | * information. | |
778c1144 EB |
525 | */ |
526 | task = get_proc_task(inode); | |
df26c40e | 527 | if (task) { |
006ebb40 | 528 | allowed = ptrace_may_access(task, PTRACE_MODE_READ); |
778c1144 | 529 | put_task_struct(task); |
df26c40e | 530 | } |
778c1144 | 531 | return allowed; |
1da177e4 LT |
532 | } |
533 | ||
6b4e306a | 534 | int proc_setattr(struct dentry *dentry, struct iattr *attr) |
6d76fa58 LT |
535 | { |
536 | int error; | |
537 | struct inode *inode = dentry->d_inode; | |
538 | ||
539 | if (attr->ia_valid & ATTR_MODE) | |
540 | return -EPERM; | |
541 | ||
542 | error = inode_change_ok(inode, attr); | |
1025774c CH |
543 | if (error) |
544 | return error; | |
545 | ||
546 | if ((attr->ia_valid & ATTR_SIZE) && | |
547 | attr->ia_size != i_size_read(inode)) { | |
548 | error = vmtruncate(inode, attr->ia_size); | |
549 | if (error) | |
550 | return error; | |
551 | } | |
552 | ||
553 | setattr_copy(inode, attr); | |
554 | mark_inode_dirty(inode); | |
555 | return 0; | |
6d76fa58 LT |
556 | } |
557 | ||
0499680a VK |
558 | /* |
559 | * May current process learn task's sched/cmdline info (for hide_pid_min=1) | |
560 | * or euid/egid (for hide_pid_min=2)? | |
561 | */ | |
562 | static bool has_pid_permissions(struct pid_namespace *pid, | |
563 | struct task_struct *task, | |
564 | int hide_pid_min) | |
565 | { | |
566 | if (pid->hide_pid < hide_pid_min) | |
567 | return true; | |
568 | if (in_group_p(pid->pid_gid)) | |
569 | return true; | |
570 | return ptrace_may_access(task, PTRACE_MODE_READ); | |
571 | } | |
572 | ||
573 | ||
574 | static int proc_pid_permission(struct inode *inode, int mask) | |
575 | { | |
576 | struct pid_namespace *pid = inode->i_sb->s_fs_info; | |
577 | struct task_struct *task; | |
578 | bool has_perms; | |
579 | ||
580 | task = get_proc_task(inode); | |
a2ef990a XF |
581 | if (!task) |
582 | return -ESRCH; | |
0499680a VK |
583 | has_perms = has_pid_permissions(pid, task, 1); |
584 | put_task_struct(task); | |
585 | ||
586 | if (!has_perms) { | |
587 | if (pid->hide_pid == 2) { | |
588 | /* | |
589 | * Let's make getdents(), stat(), and open() | |
590 | * consistent with each other. If a process | |
591 | * may not stat() a file, it shouldn't be seen | |
592 | * in procfs at all. | |
593 | */ | |
594 | return -ENOENT; | |
595 | } | |
596 | ||
597 | return -EPERM; | |
598 | } | |
599 | return generic_permission(inode, mask); | |
600 | } | |
601 | ||
602 | ||
603 | ||
c5ef1c42 | 604 | static const struct inode_operations proc_def_inode_operations = { |
6d76fa58 LT |
605 | .setattr = proc_setattr, |
606 | }; | |
607 | ||
1da177e4 LT |
608 | #define PROC_BLOCK_SIZE (3*1024) /* 4K page size but our output routines use some slack for overruns */ |
609 | ||
610 | static ssize_t proc_info_read(struct file * file, char __user * buf, | |
611 | size_t count, loff_t *ppos) | |
612 | { | |
2fddfeef | 613 | struct inode * inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
614 | unsigned long page; |
615 | ssize_t length; | |
99f89551 EB |
616 | struct task_struct *task = get_proc_task(inode); |
617 | ||
618 | length = -ESRCH; | |
619 | if (!task) | |
620 | goto out_no_task; | |
1da177e4 LT |
621 | |
622 | if (count > PROC_BLOCK_SIZE) | |
623 | count = PROC_BLOCK_SIZE; | |
99f89551 EB |
624 | |
625 | length = -ENOMEM; | |
e12ba74d | 626 | if (!(page = __get_free_page(GFP_TEMPORARY))) |
99f89551 | 627 | goto out; |
1da177e4 LT |
628 | |
629 | length = PROC_I(inode)->op.proc_read(task, (char*)page); | |
630 | ||
631 | if (length >= 0) | |
632 | length = simple_read_from_buffer(buf, count, ppos, (char *)page, length); | |
633 | free_page(page); | |
99f89551 EB |
634 | out: |
635 | put_task_struct(task); | |
636 | out_no_task: | |
1da177e4 LT |
637 | return length; |
638 | } | |
639 | ||
00977a59 | 640 | static const struct file_operations proc_info_file_operations = { |
1da177e4 | 641 | .read = proc_info_read, |
87df8424 | 642 | .llseek = generic_file_llseek, |
1da177e4 LT |
643 | }; |
644 | ||
be614086 EB |
645 | static int proc_single_show(struct seq_file *m, void *v) |
646 | { | |
647 | struct inode *inode = m->private; | |
648 | struct pid_namespace *ns; | |
649 | struct pid *pid; | |
650 | struct task_struct *task; | |
651 | int ret; | |
652 | ||
653 | ns = inode->i_sb->s_fs_info; | |
654 | pid = proc_pid(inode); | |
655 | task = get_pid_task(pid, PIDTYPE_PID); | |
656 | if (!task) | |
657 | return -ESRCH; | |
658 | ||
659 | ret = PROC_I(inode)->op.proc_show(m, ns, pid, task); | |
660 | ||
661 | put_task_struct(task); | |
662 | return ret; | |
663 | } | |
664 | ||
665 | static int proc_single_open(struct inode *inode, struct file *filp) | |
666 | { | |
c6a34058 | 667 | return single_open(filp, proc_single_show, inode); |
be614086 EB |
668 | } |
669 | ||
670 | static const struct file_operations proc_single_file_operations = { | |
671 | .open = proc_single_open, | |
672 | .read = seq_read, | |
673 | .llseek = seq_lseek, | |
674 | .release = single_release, | |
675 | }; | |
676 | ||
b409e578 | 677 | static int __mem_open(struct inode *inode, struct file *file, unsigned int mode) |
1da177e4 | 678 | { |
e268337d LT |
679 | struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode); |
680 | struct mm_struct *mm; | |
681 | ||
682 | if (!task) | |
683 | return -ESRCH; | |
684 | ||
b409e578 | 685 | mm = mm_access(task, mode); |
e268337d LT |
686 | put_task_struct(task); |
687 | ||
688 | if (IS_ERR(mm)) | |
689 | return PTR_ERR(mm); | |
690 | ||
6d08f2c7 ON |
691 | if (mm) { |
692 | /* ensure this mm_struct can't be freed */ | |
693 | atomic_inc(&mm->mm_count); | |
694 | /* but do not pin its memory */ | |
695 | mmput(mm); | |
696 | } | |
697 | ||
e268337d LT |
698 | file->private_data = mm; |
699 | ||
1da177e4 LT |
700 | return 0; |
701 | } | |
702 | ||
b409e578 CW |
703 | static int mem_open(struct inode *inode, struct file *file) |
704 | { | |
bc452b4b DH |
705 | int ret = __mem_open(inode, file, PTRACE_MODE_ATTACH); |
706 | ||
707 | /* OK to pass negative loff_t, we can catch out-of-range */ | |
708 | file->f_mode |= FMODE_UNSIGNED_OFFSET; | |
709 | ||
710 | return ret; | |
b409e578 CW |
711 | } |
712 | ||
572d34b9 ON |
713 | static ssize_t mem_rw(struct file *file, char __user *buf, |
714 | size_t count, loff_t *ppos, int write) | |
1da177e4 | 715 | { |
e268337d | 716 | struct mm_struct *mm = file->private_data; |
572d34b9 ON |
717 | unsigned long addr = *ppos; |
718 | ssize_t copied; | |
1da177e4 | 719 | char *page; |
1da177e4 | 720 | |
e268337d LT |
721 | if (!mm) |
722 | return 0; | |
99f89551 | 723 | |
30cd8903 KM |
724 | page = (char *)__get_free_page(GFP_TEMPORARY); |
725 | if (!page) | |
e268337d | 726 | return -ENOMEM; |
1da177e4 | 727 | |
f7ca54f4 | 728 | copied = 0; |
6d08f2c7 ON |
729 | if (!atomic_inc_not_zero(&mm->mm_users)) |
730 | goto free; | |
731 | ||
1da177e4 | 732 | while (count > 0) { |
572d34b9 | 733 | int this_len = min_t(int, count, PAGE_SIZE); |
1da177e4 | 734 | |
572d34b9 | 735 | if (write && copy_from_user(page, buf, this_len)) { |
1da177e4 LT |
736 | copied = -EFAULT; |
737 | break; | |
738 | } | |
572d34b9 ON |
739 | |
740 | this_len = access_remote_vm(mm, addr, page, this_len, write); | |
741 | if (!this_len) { | |
1da177e4 LT |
742 | if (!copied) |
743 | copied = -EIO; | |
744 | break; | |
745 | } | |
572d34b9 ON |
746 | |
747 | if (!write && copy_to_user(buf, page, this_len)) { | |
748 | copied = -EFAULT; | |
749 | break; | |
750 | } | |
751 | ||
752 | buf += this_len; | |
753 | addr += this_len; | |
754 | copied += this_len; | |
755 | count -= this_len; | |
1da177e4 | 756 | } |
572d34b9 | 757 | *ppos = addr; |
30cd8903 | 758 | |
6d08f2c7 ON |
759 | mmput(mm); |
760 | free: | |
30cd8903 | 761 | free_page((unsigned long) page); |
1da177e4 LT |
762 | return copied; |
763 | } | |
1da177e4 | 764 | |
572d34b9 ON |
765 | static ssize_t mem_read(struct file *file, char __user *buf, |
766 | size_t count, loff_t *ppos) | |
767 | { | |
768 | return mem_rw(file, buf, count, ppos, 0); | |
769 | } | |
770 | ||
771 | static ssize_t mem_write(struct file *file, const char __user *buf, | |
772 | size_t count, loff_t *ppos) | |
773 | { | |
774 | return mem_rw(file, (char __user*)buf, count, ppos, 1); | |
775 | } | |
776 | ||
85863e47 | 777 | loff_t mem_lseek(struct file *file, loff_t offset, int orig) |
1da177e4 LT |
778 | { |
779 | switch (orig) { | |
780 | case 0: | |
781 | file->f_pos = offset; | |
782 | break; | |
783 | case 1: | |
784 | file->f_pos += offset; | |
785 | break; | |
786 | default: | |
787 | return -EINVAL; | |
788 | } | |
789 | force_successful_syscall_return(); | |
790 | return file->f_pos; | |
791 | } | |
792 | ||
e268337d LT |
793 | static int mem_release(struct inode *inode, struct file *file) |
794 | { | |
795 | struct mm_struct *mm = file->private_data; | |
71879d3c | 796 | if (mm) |
6d08f2c7 | 797 | mmdrop(mm); |
e268337d LT |
798 | return 0; |
799 | } | |
800 | ||
00977a59 | 801 | static const struct file_operations proc_mem_operations = { |
1da177e4 LT |
802 | .llseek = mem_lseek, |
803 | .read = mem_read, | |
804 | .write = mem_write, | |
805 | .open = mem_open, | |
e268337d | 806 | .release = mem_release, |
1da177e4 LT |
807 | }; |
808 | ||
b409e578 CW |
809 | static int environ_open(struct inode *inode, struct file *file) |
810 | { | |
811 | return __mem_open(inode, file, PTRACE_MODE_READ); | |
812 | } | |
813 | ||
315e28c8 JP |
814 | static ssize_t environ_read(struct file *file, char __user *buf, |
815 | size_t count, loff_t *ppos) | |
816 | { | |
315e28c8 JP |
817 | char *page; |
818 | unsigned long src = *ppos; | |
b409e578 CW |
819 | int ret = 0; |
820 | struct mm_struct *mm = file->private_data; | |
315e28c8 | 821 | |
b409e578 CW |
822 | if (!mm) |
823 | return 0; | |
315e28c8 | 824 | |
315e28c8 JP |
825 | page = (char *)__get_free_page(GFP_TEMPORARY); |
826 | if (!page) | |
b409e578 | 827 | return -ENOMEM; |
315e28c8 | 828 | |
d6f64b89 | 829 | ret = 0; |
b409e578 CW |
830 | if (!atomic_inc_not_zero(&mm->mm_users)) |
831 | goto free; | |
315e28c8 | 832 | while (count > 0) { |
e8905ec2 DH |
833 | size_t this_len, max_len; |
834 | int retval; | |
315e28c8 | 835 | |
e8905ec2 | 836 | if (src >= (mm->env_end - mm->env_start)) |
315e28c8 JP |
837 | break; |
838 | ||
e8905ec2 DH |
839 | this_len = mm->env_end - (mm->env_start + src); |
840 | ||
841 | max_len = min_t(size_t, PAGE_SIZE, count); | |
842 | this_len = min(max_len, this_len); | |
315e28c8 | 843 | |
b409e578 | 844 | retval = access_remote_vm(mm, (mm->env_start + src), |
315e28c8 JP |
845 | page, this_len, 0); |
846 | ||
847 | if (retval <= 0) { | |
848 | ret = retval; | |
849 | break; | |
850 | } | |
851 | ||
852 | if (copy_to_user(buf, page, retval)) { | |
853 | ret = -EFAULT; | |
854 | break; | |
855 | } | |
856 | ||
857 | ret += retval; | |
858 | src += retval; | |
859 | buf += retval; | |
860 | count -= retval; | |
861 | } | |
862 | *ppos = src; | |
315e28c8 | 863 | mmput(mm); |
b409e578 CW |
864 | |
865 | free: | |
315e28c8 | 866 | free_page((unsigned long) page); |
315e28c8 JP |
867 | return ret; |
868 | } | |
869 | ||
870 | static const struct file_operations proc_environ_operations = { | |
b409e578 | 871 | .open = environ_open, |
315e28c8 | 872 | .read = environ_read, |
87df8424 | 873 | .llseek = generic_file_llseek, |
b409e578 | 874 | .release = mem_release, |
315e28c8 JP |
875 | }; |
876 | ||
1da177e4 LT |
877 | static ssize_t oom_adjust_read(struct file *file, char __user *buf, |
878 | size_t count, loff_t *ppos) | |
879 | { | |
2fddfeef | 880 | struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode); |
8578cea7 | 881 | char buffer[PROC_NUMBUF]; |
1da177e4 | 882 | size_t len; |
28b83c51 KM |
883 | int oom_adjust = OOM_DISABLE; |
884 | unsigned long flags; | |
1da177e4 | 885 | |
99f89551 EB |
886 | if (!task) |
887 | return -ESRCH; | |
28b83c51 KM |
888 | |
889 | if (lock_task_sighand(task, &flags)) { | |
890 | oom_adjust = task->signal->oom_adj; | |
891 | unlock_task_sighand(task, &flags); | |
892 | } | |
893 | ||
99f89551 EB |
894 | put_task_struct(task); |
895 | ||
8578cea7 | 896 | len = snprintf(buffer, sizeof(buffer), "%i\n", oom_adjust); |
0c28f287 AM |
897 | |
898 | return simple_read_from_buffer(buf, count, ppos, buffer, len); | |
1da177e4 LT |
899 | } |
900 | ||
901 | static ssize_t oom_adjust_write(struct file *file, const char __user *buf, | |
902 | size_t count, loff_t *ppos) | |
903 | { | |
99f89551 | 904 | struct task_struct *task; |
5d863b89 | 905 | char buffer[PROC_NUMBUF]; |
0a8cb8e3 | 906 | int oom_adjust; |
28b83c51 | 907 | unsigned long flags; |
5d863b89 | 908 | int err; |
1da177e4 | 909 | |
8578cea7 EB |
910 | memset(buffer, 0, sizeof(buffer)); |
911 | if (count > sizeof(buffer) - 1) | |
912 | count = sizeof(buffer) - 1; | |
723548bf DR |
913 | if (copy_from_user(buffer, buf, count)) { |
914 | err = -EFAULT; | |
915 | goto out; | |
916 | } | |
5d863b89 | 917 | |
0a8cb8e3 | 918 | err = kstrtoint(strstrip(buffer), 0, &oom_adjust); |
5d863b89 | 919 | if (err) |
723548bf | 920 | goto out; |
8ac773b4 | 921 | if ((oom_adjust < OOM_ADJUST_MIN || oom_adjust > OOM_ADJUST_MAX) && |
723548bf DR |
922 | oom_adjust != OOM_DISABLE) { |
923 | err = -EINVAL; | |
924 | goto out; | |
925 | } | |
5d863b89 | 926 | |
2fddfeef | 927 | task = get_proc_task(file->f_path.dentry->d_inode); |
723548bf DR |
928 | if (!task) { |
929 | err = -ESRCH; | |
930 | goto out; | |
931 | } | |
d19d5476 DR |
932 | |
933 | task_lock(task); | |
934 | if (!task->mm) { | |
935 | err = -EINVAL; | |
936 | goto err_task_lock; | |
937 | } | |
938 | ||
28b83c51 | 939 | if (!lock_task_sighand(task, &flags)) { |
723548bf | 940 | err = -ESRCH; |
d19d5476 | 941 | goto err_task_lock; |
28b83c51 KM |
942 | } |
943 | ||
944 | if (oom_adjust < task->signal->oom_adj && !capable(CAP_SYS_RESOURCE)) { | |
723548bf DR |
945 | err = -EACCES; |
946 | goto err_sighand; | |
8fb4fc68 | 947 | } |
28b83c51 | 948 | |
51b1bd2a DR |
949 | /* |
950 | * Warn that /proc/pid/oom_adj is deprecated, see | |
951 | * Documentation/feature-removal-schedule.txt. | |
952 | */ | |
c2142704 | 953 | printk_once(KERN_WARNING "%s (%d): /proc/%d/oom_adj is deprecated, please use /proc/%d/oom_score_adj instead.\n", |
be8f684d DR |
954 | current->comm, task_pid_nr(current), task_pid_nr(task), |
955 | task_pid_nr(task)); | |
28b83c51 | 956 | task->signal->oom_adj = oom_adjust; |
a63d83f4 DR |
957 | /* |
958 | * Scale /proc/pid/oom_score_adj appropriately ensuring that a maximum | |
959 | * value is always attainable. | |
960 | */ | |
961 | if (task->signal->oom_adj == OOM_ADJUST_MAX) | |
962 | task->signal->oom_score_adj = OOM_SCORE_ADJ_MAX; | |
963 | else | |
964 | task->signal->oom_score_adj = (oom_adjust * OOM_SCORE_ADJ_MAX) / | |
965 | -OOM_DISABLE; | |
43d2b113 | 966 | trace_oom_score_adj_update(task); |
723548bf | 967 | err_sighand: |
28b83c51 | 968 | unlock_task_sighand(task, &flags); |
d19d5476 DR |
969 | err_task_lock: |
970 | task_unlock(task); | |
99f89551 | 971 | put_task_struct(task); |
723548bf DR |
972 | out: |
973 | return err < 0 ? err : count; | |
1da177e4 LT |
974 | } |
975 | ||
00977a59 | 976 | static const struct file_operations proc_oom_adjust_operations = { |
1da177e4 LT |
977 | .read = oom_adjust_read, |
978 | .write = oom_adjust_write, | |
87df8424 | 979 | .llseek = generic_file_llseek, |
1da177e4 LT |
980 | }; |
981 | ||
a63d83f4 DR |
982 | static ssize_t oom_score_adj_read(struct file *file, char __user *buf, |
983 | size_t count, loff_t *ppos) | |
984 | { | |
985 | struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode); | |
986 | char buffer[PROC_NUMBUF]; | |
987 | int oom_score_adj = OOM_SCORE_ADJ_MIN; | |
988 | unsigned long flags; | |
989 | size_t len; | |
990 | ||
991 | if (!task) | |
992 | return -ESRCH; | |
993 | if (lock_task_sighand(task, &flags)) { | |
994 | oom_score_adj = task->signal->oom_score_adj; | |
995 | unlock_task_sighand(task, &flags); | |
996 | } | |
997 | put_task_struct(task); | |
998 | len = snprintf(buffer, sizeof(buffer), "%d\n", oom_score_adj); | |
999 | return simple_read_from_buffer(buf, count, ppos, buffer, len); | |
1000 | } | |
1001 | ||
1002 | static ssize_t oom_score_adj_write(struct file *file, const char __user *buf, | |
1003 | size_t count, loff_t *ppos) | |
1004 | { | |
1005 | struct task_struct *task; | |
1006 | char buffer[PROC_NUMBUF]; | |
1007 | unsigned long flags; | |
0a8cb8e3 | 1008 | int oom_score_adj; |
a63d83f4 DR |
1009 | int err; |
1010 | ||
1011 | memset(buffer, 0, sizeof(buffer)); | |
1012 | if (count > sizeof(buffer) - 1) | |
1013 | count = sizeof(buffer) - 1; | |
723548bf DR |
1014 | if (copy_from_user(buffer, buf, count)) { |
1015 | err = -EFAULT; | |
1016 | goto out; | |
1017 | } | |
a63d83f4 | 1018 | |
0a8cb8e3 | 1019 | err = kstrtoint(strstrip(buffer), 0, &oom_score_adj); |
a63d83f4 | 1020 | if (err) |
723548bf | 1021 | goto out; |
a63d83f4 | 1022 | if (oom_score_adj < OOM_SCORE_ADJ_MIN || |
723548bf DR |
1023 | oom_score_adj > OOM_SCORE_ADJ_MAX) { |
1024 | err = -EINVAL; | |
1025 | goto out; | |
1026 | } | |
a63d83f4 DR |
1027 | |
1028 | task = get_proc_task(file->f_path.dentry->d_inode); | |
723548bf DR |
1029 | if (!task) { |
1030 | err = -ESRCH; | |
1031 | goto out; | |
1032 | } | |
d19d5476 DR |
1033 | |
1034 | task_lock(task); | |
1035 | if (!task->mm) { | |
1036 | err = -EINVAL; | |
1037 | goto err_task_lock; | |
1038 | } | |
1039 | ||
a63d83f4 | 1040 | if (!lock_task_sighand(task, &flags)) { |
723548bf | 1041 | err = -ESRCH; |
d19d5476 | 1042 | goto err_task_lock; |
a63d83f4 | 1043 | } |
d19d5476 | 1044 | |
dabb16f6 | 1045 | if (oom_score_adj < task->signal->oom_score_adj_min && |
a63d83f4 | 1046 | !capable(CAP_SYS_RESOURCE)) { |
723548bf DR |
1047 | err = -EACCES; |
1048 | goto err_sighand; | |
a63d83f4 DR |
1049 | } |
1050 | ||
1051 | task->signal->oom_score_adj = oom_score_adj; | |
dabb16f6 MSB |
1052 | if (has_capability_noaudit(current, CAP_SYS_RESOURCE)) |
1053 | task->signal->oom_score_adj_min = oom_score_adj; | |
43d2b113 | 1054 | trace_oom_score_adj_update(task); |
a63d83f4 DR |
1055 | /* |
1056 | * Scale /proc/pid/oom_adj appropriately ensuring that OOM_DISABLE is | |
1057 | * always attainable. | |
1058 | */ | |
1059 | if (task->signal->oom_score_adj == OOM_SCORE_ADJ_MIN) | |
1060 | task->signal->oom_adj = OOM_DISABLE; | |
1061 | else | |
1062 | task->signal->oom_adj = (oom_score_adj * OOM_ADJUST_MAX) / | |
1063 | OOM_SCORE_ADJ_MAX; | |
723548bf | 1064 | err_sighand: |
a63d83f4 | 1065 | unlock_task_sighand(task, &flags); |
d19d5476 DR |
1066 | err_task_lock: |
1067 | task_unlock(task); | |
a63d83f4 | 1068 | put_task_struct(task); |
723548bf DR |
1069 | out: |
1070 | return err < 0 ? err : count; | |
a63d83f4 DR |
1071 | } |
1072 | ||
1073 | static const struct file_operations proc_oom_score_adj_operations = { | |
1074 | .read = oom_score_adj_read, | |
1075 | .write = oom_score_adj_write, | |
6038f373 | 1076 | .llseek = default_llseek, |
a63d83f4 DR |
1077 | }; |
1078 | ||
1da177e4 LT |
1079 | #ifdef CONFIG_AUDITSYSCALL |
1080 | #define TMPBUFLEN 21 | |
1081 | static ssize_t proc_loginuid_read(struct file * file, char __user * buf, | |
1082 | size_t count, loff_t *ppos) | |
1083 | { | |
2fddfeef | 1084 | struct inode * inode = file->f_path.dentry->d_inode; |
99f89551 | 1085 | struct task_struct *task = get_proc_task(inode); |
1da177e4 LT |
1086 | ssize_t length; |
1087 | char tmpbuf[TMPBUFLEN]; | |
1088 | ||
99f89551 EB |
1089 | if (!task) |
1090 | return -ESRCH; | |
1da177e4 | 1091 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", |
0c11b942 | 1092 | audit_get_loginuid(task)); |
99f89551 | 1093 | put_task_struct(task); |
1da177e4 LT |
1094 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); |
1095 | } | |
1096 | ||
1097 | static ssize_t proc_loginuid_write(struct file * file, const char __user * buf, | |
1098 | size_t count, loff_t *ppos) | |
1099 | { | |
2fddfeef | 1100 | struct inode * inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
1101 | char *page, *tmp; |
1102 | ssize_t length; | |
1da177e4 LT |
1103 | uid_t loginuid; |
1104 | ||
7dc52157 PM |
1105 | rcu_read_lock(); |
1106 | if (current != pid_task(proc_pid(inode), PIDTYPE_PID)) { | |
1107 | rcu_read_unlock(); | |
1da177e4 | 1108 | return -EPERM; |
7dc52157 PM |
1109 | } |
1110 | rcu_read_unlock(); | |
1da177e4 | 1111 | |
e0182909 AV |
1112 | if (count >= PAGE_SIZE) |
1113 | count = PAGE_SIZE - 1; | |
1da177e4 LT |
1114 | |
1115 | if (*ppos != 0) { | |
1116 | /* No partial writes. */ | |
1117 | return -EINVAL; | |
1118 | } | |
e12ba74d | 1119 | page = (char*)__get_free_page(GFP_TEMPORARY); |
1da177e4 LT |
1120 | if (!page) |
1121 | return -ENOMEM; | |
1122 | length = -EFAULT; | |
1123 | if (copy_from_user(page, buf, count)) | |
1124 | goto out_free_page; | |
1125 | ||
e0182909 | 1126 | page[count] = '\0'; |
1da177e4 LT |
1127 | loginuid = simple_strtoul(page, &tmp, 10); |
1128 | if (tmp == page) { | |
1129 | length = -EINVAL; | |
1130 | goto out_free_page; | |
1131 | ||
1132 | } | |
0a300be6 | 1133 | length = audit_set_loginuid(loginuid); |
1da177e4 LT |
1134 | if (likely(length == 0)) |
1135 | length = count; | |
1136 | ||
1137 | out_free_page: | |
1138 | free_page((unsigned long) page); | |
1139 | return length; | |
1140 | } | |
1141 | ||
00977a59 | 1142 | static const struct file_operations proc_loginuid_operations = { |
1da177e4 LT |
1143 | .read = proc_loginuid_read, |
1144 | .write = proc_loginuid_write, | |
87df8424 | 1145 | .llseek = generic_file_llseek, |
1da177e4 | 1146 | }; |
1e0bd755 EP |
1147 | |
1148 | static ssize_t proc_sessionid_read(struct file * file, char __user * buf, | |
1149 | size_t count, loff_t *ppos) | |
1150 | { | |
1151 | struct inode * inode = file->f_path.dentry->d_inode; | |
1152 | struct task_struct *task = get_proc_task(inode); | |
1153 | ssize_t length; | |
1154 | char tmpbuf[TMPBUFLEN]; | |
1155 | ||
1156 | if (!task) | |
1157 | return -ESRCH; | |
1158 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", | |
1159 | audit_get_sessionid(task)); | |
1160 | put_task_struct(task); | |
1161 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
1162 | } | |
1163 | ||
1164 | static const struct file_operations proc_sessionid_operations = { | |
1165 | .read = proc_sessionid_read, | |
87df8424 | 1166 | .llseek = generic_file_llseek, |
1e0bd755 | 1167 | }; |
1da177e4 LT |
1168 | #endif |
1169 | ||
f4f154fd AM |
1170 | #ifdef CONFIG_FAULT_INJECTION |
1171 | static ssize_t proc_fault_inject_read(struct file * file, char __user * buf, | |
1172 | size_t count, loff_t *ppos) | |
1173 | { | |
1174 | struct task_struct *task = get_proc_task(file->f_dentry->d_inode); | |
1175 | char buffer[PROC_NUMBUF]; | |
1176 | size_t len; | |
1177 | int make_it_fail; | |
f4f154fd AM |
1178 | |
1179 | if (!task) | |
1180 | return -ESRCH; | |
1181 | make_it_fail = task->make_it_fail; | |
1182 | put_task_struct(task); | |
1183 | ||
1184 | len = snprintf(buffer, sizeof(buffer), "%i\n", make_it_fail); | |
0c28f287 AM |
1185 | |
1186 | return simple_read_from_buffer(buf, count, ppos, buffer, len); | |
f4f154fd AM |
1187 | } |
1188 | ||
1189 | static ssize_t proc_fault_inject_write(struct file * file, | |
1190 | const char __user * buf, size_t count, loff_t *ppos) | |
1191 | { | |
1192 | struct task_struct *task; | |
1193 | char buffer[PROC_NUMBUF], *end; | |
1194 | int make_it_fail; | |
1195 | ||
1196 | if (!capable(CAP_SYS_RESOURCE)) | |
1197 | return -EPERM; | |
1198 | memset(buffer, 0, sizeof(buffer)); | |
1199 | if (count > sizeof(buffer) - 1) | |
1200 | count = sizeof(buffer) - 1; | |
1201 | if (copy_from_user(buffer, buf, count)) | |
1202 | return -EFAULT; | |
cba8aafe VL |
1203 | make_it_fail = simple_strtol(strstrip(buffer), &end, 0); |
1204 | if (*end) | |
1205 | return -EINVAL; | |
f4f154fd AM |
1206 | task = get_proc_task(file->f_dentry->d_inode); |
1207 | if (!task) | |
1208 | return -ESRCH; | |
1209 | task->make_it_fail = make_it_fail; | |
1210 | put_task_struct(task); | |
cba8aafe VL |
1211 | |
1212 | return count; | |
f4f154fd AM |
1213 | } |
1214 | ||
00977a59 | 1215 | static const struct file_operations proc_fault_inject_operations = { |
f4f154fd AM |
1216 | .read = proc_fault_inject_read, |
1217 | .write = proc_fault_inject_write, | |
87df8424 | 1218 | .llseek = generic_file_llseek, |
f4f154fd AM |
1219 | }; |
1220 | #endif | |
1221 | ||
9745512c | 1222 | |
43ae34cb IM |
1223 | #ifdef CONFIG_SCHED_DEBUG |
1224 | /* | |
1225 | * Print out various scheduling related per-task fields: | |
1226 | */ | |
1227 | static int sched_show(struct seq_file *m, void *v) | |
1228 | { | |
1229 | struct inode *inode = m->private; | |
1230 | struct task_struct *p; | |
1231 | ||
43ae34cb IM |
1232 | p = get_proc_task(inode); |
1233 | if (!p) | |
1234 | return -ESRCH; | |
1235 | proc_sched_show_task(p, m); | |
1236 | ||
1237 | put_task_struct(p); | |
1238 | ||
1239 | return 0; | |
1240 | } | |
1241 | ||
1242 | static ssize_t | |
1243 | sched_write(struct file *file, const char __user *buf, | |
1244 | size_t count, loff_t *offset) | |
1245 | { | |
1246 | struct inode *inode = file->f_path.dentry->d_inode; | |
1247 | struct task_struct *p; | |
1248 | ||
43ae34cb IM |
1249 | p = get_proc_task(inode); |
1250 | if (!p) | |
1251 | return -ESRCH; | |
1252 | proc_sched_set_task(p); | |
1253 | ||
1254 | put_task_struct(p); | |
1255 | ||
1256 | return count; | |
1257 | } | |
1258 | ||
1259 | static int sched_open(struct inode *inode, struct file *filp) | |
1260 | { | |
c6a34058 | 1261 | return single_open(filp, sched_show, inode); |
43ae34cb IM |
1262 | } |
1263 | ||
1264 | static const struct file_operations proc_pid_sched_operations = { | |
1265 | .open = sched_open, | |
1266 | .read = seq_read, | |
1267 | .write = sched_write, | |
1268 | .llseek = seq_lseek, | |
5ea473a1 | 1269 | .release = single_release, |
43ae34cb IM |
1270 | }; |
1271 | ||
1272 | #endif | |
1273 | ||
5091faa4 MG |
1274 | #ifdef CONFIG_SCHED_AUTOGROUP |
1275 | /* | |
1276 | * Print out autogroup related information: | |
1277 | */ | |
1278 | static int sched_autogroup_show(struct seq_file *m, void *v) | |
1279 | { | |
1280 | struct inode *inode = m->private; | |
1281 | struct task_struct *p; | |
1282 | ||
1283 | p = get_proc_task(inode); | |
1284 | if (!p) | |
1285 | return -ESRCH; | |
1286 | proc_sched_autogroup_show_task(p, m); | |
1287 | ||
1288 | put_task_struct(p); | |
1289 | ||
1290 | return 0; | |
1291 | } | |
1292 | ||
1293 | static ssize_t | |
1294 | sched_autogroup_write(struct file *file, const char __user *buf, | |
1295 | size_t count, loff_t *offset) | |
1296 | { | |
1297 | struct inode *inode = file->f_path.dentry->d_inode; | |
1298 | struct task_struct *p; | |
1299 | char buffer[PROC_NUMBUF]; | |
0a8cb8e3 | 1300 | int nice; |
5091faa4 MG |
1301 | int err; |
1302 | ||
1303 | memset(buffer, 0, sizeof(buffer)); | |
1304 | if (count > sizeof(buffer) - 1) | |
1305 | count = sizeof(buffer) - 1; | |
1306 | if (copy_from_user(buffer, buf, count)) | |
1307 | return -EFAULT; | |
1308 | ||
0a8cb8e3 AD |
1309 | err = kstrtoint(strstrip(buffer), 0, &nice); |
1310 | if (err < 0) | |
1311 | return err; | |
5091faa4 MG |
1312 | |
1313 | p = get_proc_task(inode); | |
1314 | if (!p) | |
1315 | return -ESRCH; | |
1316 | ||
2e5b5b3a | 1317 | err = proc_sched_autogroup_set_nice(p, nice); |
5091faa4 MG |
1318 | if (err) |
1319 | count = err; | |
1320 | ||
1321 | put_task_struct(p); | |
1322 | ||
1323 | return count; | |
1324 | } | |
1325 | ||
1326 | static int sched_autogroup_open(struct inode *inode, struct file *filp) | |
1327 | { | |
1328 | int ret; | |
1329 | ||
1330 | ret = single_open(filp, sched_autogroup_show, NULL); | |
1331 | if (!ret) { | |
1332 | struct seq_file *m = filp->private_data; | |
1333 | ||
1334 | m->private = inode; | |
1335 | } | |
1336 | return ret; | |
1337 | } | |
1338 | ||
1339 | static const struct file_operations proc_pid_sched_autogroup_operations = { | |
1340 | .open = sched_autogroup_open, | |
1341 | .read = seq_read, | |
1342 | .write = sched_autogroup_write, | |
1343 | .llseek = seq_lseek, | |
1344 | .release = single_release, | |
1345 | }; | |
1346 | ||
1347 | #endif /* CONFIG_SCHED_AUTOGROUP */ | |
1348 | ||
4614a696 JS |
1349 | static ssize_t comm_write(struct file *file, const char __user *buf, |
1350 | size_t count, loff_t *offset) | |
1351 | { | |
1352 | struct inode *inode = file->f_path.dentry->d_inode; | |
1353 | struct task_struct *p; | |
1354 | char buffer[TASK_COMM_LEN]; | |
1355 | ||
1356 | memset(buffer, 0, sizeof(buffer)); | |
1357 | if (count > sizeof(buffer) - 1) | |
1358 | count = sizeof(buffer) - 1; | |
1359 | if (copy_from_user(buffer, buf, count)) | |
1360 | return -EFAULT; | |
1361 | ||
1362 | p = get_proc_task(inode); | |
1363 | if (!p) | |
1364 | return -ESRCH; | |
1365 | ||
1366 | if (same_thread_group(current, p)) | |
1367 | set_task_comm(p, buffer); | |
1368 | else | |
1369 | count = -EINVAL; | |
1370 | ||
1371 | put_task_struct(p); | |
1372 | ||
1373 | return count; | |
1374 | } | |
1375 | ||
1376 | static int comm_show(struct seq_file *m, void *v) | |
1377 | { | |
1378 | struct inode *inode = m->private; | |
1379 | struct task_struct *p; | |
1380 | ||
1381 | p = get_proc_task(inode); | |
1382 | if (!p) | |
1383 | return -ESRCH; | |
1384 | ||
1385 | task_lock(p); | |
1386 | seq_printf(m, "%s\n", p->comm); | |
1387 | task_unlock(p); | |
1388 | ||
1389 | put_task_struct(p); | |
1390 | ||
1391 | return 0; | |
1392 | } | |
1393 | ||
1394 | static int comm_open(struct inode *inode, struct file *filp) | |
1395 | { | |
c6a34058 | 1396 | return single_open(filp, comm_show, inode); |
4614a696 JS |
1397 | } |
1398 | ||
1399 | static const struct file_operations proc_pid_set_comm_operations = { | |
1400 | .open = comm_open, | |
1401 | .read = seq_read, | |
1402 | .write = comm_write, | |
1403 | .llseek = seq_lseek, | |
1404 | .release = single_release, | |
1405 | }; | |
1406 | ||
7773fbc5 | 1407 | static int proc_exe_link(struct dentry *dentry, struct path *exe_path) |
925d1c40 MH |
1408 | { |
1409 | struct task_struct *task; | |
1410 | struct mm_struct *mm; | |
1411 | struct file *exe_file; | |
1412 | ||
7773fbc5 | 1413 | task = get_proc_task(dentry->d_inode); |
925d1c40 MH |
1414 | if (!task) |
1415 | return -ENOENT; | |
1416 | mm = get_task_mm(task); | |
1417 | put_task_struct(task); | |
1418 | if (!mm) | |
1419 | return -ENOENT; | |
1420 | exe_file = get_mm_exe_file(mm); | |
1421 | mmput(mm); | |
1422 | if (exe_file) { | |
1423 | *exe_path = exe_file->f_path; | |
1424 | path_get(&exe_file->f_path); | |
1425 | fput(exe_file); | |
1426 | return 0; | |
1427 | } else | |
1428 | return -ENOENT; | |
1429 | } | |
1430 | ||
008b150a | 1431 | static void *proc_pid_follow_link(struct dentry *dentry, struct nameidata *nd) |
1da177e4 LT |
1432 | { |
1433 | struct inode *inode = dentry->d_inode; | |
408ef013 | 1434 | struct path path; |
1da177e4 LT |
1435 | int error = -EACCES; |
1436 | ||
778c1144 EB |
1437 | /* Are we allowed to snoop on the tasks file descriptors? */ |
1438 | if (!proc_fd_access_allowed(inode)) | |
1da177e4 | 1439 | goto out; |
1da177e4 | 1440 | |
408ef013 CH |
1441 | error = PROC_I(inode)->op.proc_get_link(dentry, &path); |
1442 | if (error) | |
1443 | goto out; | |
1444 | ||
b5fb63c1 | 1445 | nd_jump_link(nd, &path); |
408ef013 | 1446 | return NULL; |
1da177e4 | 1447 | out: |
008b150a | 1448 | return ERR_PTR(error); |
1da177e4 LT |
1449 | } |
1450 | ||
3dcd25f3 | 1451 | static int do_proc_readlink(struct path *path, char __user *buffer, int buflen) |
1da177e4 | 1452 | { |
e12ba74d | 1453 | char *tmp = (char*)__get_free_page(GFP_TEMPORARY); |
3dcd25f3 | 1454 | char *pathname; |
1da177e4 LT |
1455 | int len; |
1456 | ||
1457 | if (!tmp) | |
1458 | return -ENOMEM; | |
0c28f287 | 1459 | |
7b2a69ba | 1460 | pathname = d_path(path, tmp, PAGE_SIZE); |
3dcd25f3 JB |
1461 | len = PTR_ERR(pathname); |
1462 | if (IS_ERR(pathname)) | |
1da177e4 | 1463 | goto out; |
3dcd25f3 | 1464 | len = tmp + PAGE_SIZE - 1 - pathname; |
1da177e4 LT |
1465 | |
1466 | if (len > buflen) | |
1467 | len = buflen; | |
3dcd25f3 | 1468 | if (copy_to_user(buffer, pathname, len)) |
1da177e4 LT |
1469 | len = -EFAULT; |
1470 | out: | |
1471 | free_page((unsigned long)tmp); | |
1472 | return len; | |
1473 | } | |
1474 | ||
1475 | static int proc_pid_readlink(struct dentry * dentry, char __user * buffer, int buflen) | |
1476 | { | |
1477 | int error = -EACCES; | |
1478 | struct inode *inode = dentry->d_inode; | |
3dcd25f3 | 1479 | struct path path; |
1da177e4 | 1480 | |
778c1144 EB |
1481 | /* Are we allowed to snoop on the tasks file descriptors? */ |
1482 | if (!proc_fd_access_allowed(inode)) | |
1da177e4 | 1483 | goto out; |
1da177e4 | 1484 | |
7773fbc5 | 1485 | error = PROC_I(inode)->op.proc_get_link(dentry, &path); |
1da177e4 LT |
1486 | if (error) |
1487 | goto out; | |
1488 | ||
3dcd25f3 JB |
1489 | error = do_proc_readlink(&path, buffer, buflen); |
1490 | path_put(&path); | |
1da177e4 | 1491 | out: |
1da177e4 LT |
1492 | return error; |
1493 | } | |
1494 | ||
c5ef1c42 | 1495 | static const struct inode_operations proc_pid_link_inode_operations = { |
1da177e4 | 1496 | .readlink = proc_pid_readlink, |
6d76fa58 LT |
1497 | .follow_link = proc_pid_follow_link, |
1498 | .setattr = proc_setattr, | |
1da177e4 LT |
1499 | }; |
1500 | ||
28a6d671 EB |
1501 | |
1502 | /* building an inode */ | |
1503 | ||
1504 | static int task_dumpable(struct task_struct *task) | |
1da177e4 | 1505 | { |
28a6d671 EB |
1506 | int dumpable = 0; |
1507 | struct mm_struct *mm; | |
1da177e4 | 1508 | |
28a6d671 EB |
1509 | task_lock(task); |
1510 | mm = task->mm; | |
1511 | if (mm) | |
6c5d5238 | 1512 | dumpable = get_dumpable(mm); |
28a6d671 EB |
1513 | task_unlock(task); |
1514 | if(dumpable == 1) | |
1515 | return 1; | |
1516 | return 0; | |
1517 | } | |
1da177e4 | 1518 | |
6b4e306a | 1519 | struct inode *proc_pid_make_inode(struct super_block * sb, struct task_struct *task) |
28a6d671 EB |
1520 | { |
1521 | struct inode * inode; | |
1522 | struct proc_inode *ei; | |
c69e8d9c | 1523 | const struct cred *cred; |
1da177e4 | 1524 | |
28a6d671 | 1525 | /* We need a new inode */ |
1da177e4 | 1526 | |
28a6d671 EB |
1527 | inode = new_inode(sb); |
1528 | if (!inode) | |
1529 | goto out; | |
1530 | ||
1531 | /* Common stuff */ | |
1532 | ei = PROC_I(inode); | |
85fe4025 | 1533 | inode->i_ino = get_next_ino(); |
28a6d671 | 1534 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; |
28a6d671 EB |
1535 | inode->i_op = &proc_def_inode_operations; |
1536 | ||
1537 | /* | |
1538 | * grab the reference to task. | |
1539 | */ | |
1a657f78 | 1540 | ei->pid = get_task_pid(task, PIDTYPE_PID); |
28a6d671 EB |
1541 | if (!ei->pid) |
1542 | goto out_unlock; | |
1543 | ||
28a6d671 | 1544 | if (task_dumpable(task)) { |
c69e8d9c DH |
1545 | rcu_read_lock(); |
1546 | cred = __task_cred(task); | |
1547 | inode->i_uid = cred->euid; | |
1548 | inode->i_gid = cred->egid; | |
1549 | rcu_read_unlock(); | |
1da177e4 | 1550 | } |
28a6d671 EB |
1551 | security_task_to_inode(task, inode); |
1552 | ||
1da177e4 | 1553 | out: |
28a6d671 EB |
1554 | return inode; |
1555 | ||
1556 | out_unlock: | |
1557 | iput(inode); | |
1558 | return NULL; | |
1da177e4 LT |
1559 | } |
1560 | ||
6b4e306a | 1561 | int pid_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) |
1da177e4 | 1562 | { |
1da177e4 | 1563 | struct inode *inode = dentry->d_inode; |
28a6d671 | 1564 | struct task_struct *task; |
c69e8d9c | 1565 | const struct cred *cred; |
0499680a | 1566 | struct pid_namespace *pid = dentry->d_sb->s_fs_info; |
c69e8d9c | 1567 | |
28a6d671 | 1568 | generic_fillattr(inode, stat); |
1da177e4 | 1569 | |
28a6d671 | 1570 | rcu_read_lock(); |
dcb0f222 EB |
1571 | stat->uid = GLOBAL_ROOT_UID; |
1572 | stat->gid = GLOBAL_ROOT_GID; | |
28a6d671 EB |
1573 | task = pid_task(proc_pid(inode), PIDTYPE_PID); |
1574 | if (task) { | |
0499680a VK |
1575 | if (!has_pid_permissions(pid, task, 2)) { |
1576 | rcu_read_unlock(); | |
1577 | /* | |
1578 | * This doesn't prevent learning whether PID exists, | |
1579 | * it only makes getattr() consistent with readdir(). | |
1580 | */ | |
1581 | return -ENOENT; | |
1582 | } | |
28a6d671 EB |
1583 | if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) || |
1584 | task_dumpable(task)) { | |
c69e8d9c DH |
1585 | cred = __task_cred(task); |
1586 | stat->uid = cred->euid; | |
1587 | stat->gid = cred->egid; | |
1da177e4 LT |
1588 | } |
1589 | } | |
28a6d671 | 1590 | rcu_read_unlock(); |
d6e71144 | 1591 | return 0; |
1da177e4 LT |
1592 | } |
1593 | ||
1da177e4 LT |
1594 | /* dentry stuff */ |
1595 | ||
1596 | /* | |
1597 | * Exceptional case: normally we are not allowed to unhash a busy | |
1598 | * directory. In this case, however, we can do it - no aliasing problems | |
1599 | * due to the way we treat inodes. | |
1600 | * | |
1601 | * Rewrite the inode's ownerships here because the owning task may have | |
1602 | * performed a setuid(), etc. | |
99f89551 EB |
1603 | * |
1604 | * Before the /proc/pid/status file was created the only way to read | |
1605 | * the effective uid of a /process was to stat /proc/pid. Reading | |
1606 | * /proc/pid/status is slow enough that procps and other packages | |
1607 | * kept stating /proc/pid. To keep the rules in /proc simple I have | |
1608 | * made this apply to all per process world readable and executable | |
1609 | * directories. | |
1da177e4 | 1610 | */ |
0b728e19 | 1611 | int pid_revalidate(struct dentry *dentry, unsigned int flags) |
1da177e4 | 1612 | { |
34286d66 NP |
1613 | struct inode *inode; |
1614 | struct task_struct *task; | |
c69e8d9c DH |
1615 | const struct cred *cred; |
1616 | ||
0b728e19 | 1617 | if (flags & LOOKUP_RCU) |
34286d66 NP |
1618 | return -ECHILD; |
1619 | ||
1620 | inode = dentry->d_inode; | |
1621 | task = get_proc_task(inode); | |
1622 | ||
99f89551 EB |
1623 | if (task) { |
1624 | if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) || | |
1625 | task_dumpable(task)) { | |
c69e8d9c DH |
1626 | rcu_read_lock(); |
1627 | cred = __task_cred(task); | |
1628 | inode->i_uid = cred->euid; | |
1629 | inode->i_gid = cred->egid; | |
1630 | rcu_read_unlock(); | |
1da177e4 | 1631 | } else { |
dcb0f222 EB |
1632 | inode->i_uid = GLOBAL_ROOT_UID; |
1633 | inode->i_gid = GLOBAL_ROOT_GID; | |
1da177e4 | 1634 | } |
9ee8ab9f | 1635 | inode->i_mode &= ~(S_ISUID | S_ISGID); |
1da177e4 | 1636 | security_task_to_inode(task, inode); |
99f89551 | 1637 | put_task_struct(task); |
1da177e4 LT |
1638 | return 1; |
1639 | } | |
1640 | d_drop(dentry); | |
1641 | return 0; | |
1642 | } | |
1643 | ||
fe15ce44 | 1644 | static int pid_delete_dentry(const struct dentry * dentry) |
99f89551 | 1645 | { |
28a6d671 EB |
1646 | /* Is the task we represent dead? |
1647 | * If so, then don't put the dentry on the lru list, | |
1648 | * kill it immediately. | |
1649 | */ | |
1650 | return !proc_pid(dentry->d_inode)->tasks[PIDTYPE_PID].first; | |
1651 | } | |
1652 | ||
6b4e306a | 1653 | const struct dentry_operations pid_dentry_operations = |
28a6d671 EB |
1654 | { |
1655 | .d_revalidate = pid_revalidate, | |
1656 | .d_delete = pid_delete_dentry, | |
1657 | }; | |
1658 | ||
1659 | /* Lookups */ | |
1660 | ||
1c0d04c9 EB |
1661 | /* |
1662 | * Fill a directory entry. | |
1663 | * | |
1664 | * If possible create the dcache entry and derive our inode number and | |
1665 | * file type from dcache entry. | |
1666 | * | |
1667 | * Since all of the proc inode numbers are dynamically generated, the inode | |
1668 | * numbers do not exist until the inode is cache. This means creating the | |
1669 | * the dcache entry in readdir is necessary to keep the inode numbers | |
1670 | * reported by readdir in sync with the inode numbers reported | |
1671 | * by stat. | |
1672 | */ | |
6b4e306a EB |
1673 | int proc_fill_cache(struct file *filp, void *dirent, filldir_t filldir, |
1674 | const char *name, int len, | |
c5141e6d | 1675 | instantiate_t instantiate, struct task_struct *task, const void *ptr) |
61a28784 | 1676 | { |
2fddfeef | 1677 | struct dentry *child, *dir = filp->f_path.dentry; |
61a28784 EB |
1678 | struct inode *inode; |
1679 | struct qstr qname; | |
1680 | ino_t ino = 0; | |
1681 | unsigned type = DT_UNKNOWN; | |
1682 | ||
1683 | qname.name = name; | |
1684 | qname.len = len; | |
1685 | qname.hash = full_name_hash(name, len); | |
1686 | ||
1687 | child = d_lookup(dir, &qname); | |
1688 | if (!child) { | |
1689 | struct dentry *new; | |
1690 | new = d_alloc(dir, &qname); | |
1691 | if (new) { | |
1692 | child = instantiate(dir->d_inode, new, task, ptr); | |
1693 | if (child) | |
1694 | dput(new); | |
1695 | else | |
1696 | child = new; | |
1697 | } | |
1698 | } | |
1699 | if (!child || IS_ERR(child) || !child->d_inode) | |
1700 | goto end_instantiate; | |
1701 | inode = child->d_inode; | |
1702 | if (inode) { | |
1703 | ino = inode->i_ino; | |
1704 | type = inode->i_mode >> 12; | |
1705 | } | |
1706 | dput(child); | |
1707 | end_instantiate: | |
1708 | if (!ino) | |
1709 | ino = find_inode_number(dir, &qname); | |
1710 | if (!ino) | |
1711 | ino = 1; | |
1712 | return filldir(dirent, name, len, filp->f_pos, ino, type); | |
1713 | } | |
1714 | ||
28a6d671 EB |
1715 | static unsigned name_to_int(struct dentry *dentry) |
1716 | { | |
1717 | const char *name = dentry->d_name.name; | |
1718 | int len = dentry->d_name.len; | |
1719 | unsigned n = 0; | |
1720 | ||
1721 | if (len > 1 && *name == '0') | |
1722 | goto out; | |
1723 | while (len-- > 0) { | |
1724 | unsigned c = *name++ - '0'; | |
1725 | if (c > 9) | |
1726 | goto out; | |
1727 | if (n >= (~0U-9)/10) | |
1728 | goto out; | |
1729 | n *= 10; | |
1730 | n += c; | |
1731 | } | |
1732 | return n; | |
1733 | out: | |
1734 | return ~0U; | |
1735 | } | |
1736 | ||
27932742 MS |
1737 | #define PROC_FDINFO_MAX 64 |
1738 | ||
3dcd25f3 | 1739 | static int proc_fd_info(struct inode *inode, struct path *path, char *info) |
28a6d671 | 1740 | { |
5e442a49 LT |
1741 | struct task_struct *task = get_proc_task(inode); |
1742 | struct files_struct *files = NULL; | |
28a6d671 EB |
1743 | struct file *file; |
1744 | int fd = proc_fd(inode); | |
aa6afca5 | 1745 | |
5e442a49 LT |
1746 | if (task) { |
1747 | files = get_files_struct(task); | |
1748 | put_task_struct(task); | |
1749 | } | |
1750 | if (files) { | |
1751 | /* | |
1752 | * We are not taking a ref to the file structure, so we must | |
1753 | * hold ->file_lock. | |
1754 | */ | |
1755 | spin_lock(&files->file_lock); | |
1756 | file = fcheck_files(files, fd); | |
1757 | if (file) { | |
1758 | unsigned int f_flags; | |
1759 | struct fdtable *fdt; | |
1760 | ||
1761 | fdt = files_fdtable(files); | |
1762 | f_flags = file->f_flags & ~O_CLOEXEC; | |
1dce27c5 | 1763 | if (close_on_exec(fd, fdt)) |
5e442a49 LT |
1764 | f_flags |= O_CLOEXEC; |
1765 | ||
1766 | if (path) { | |
1767 | *path = file->f_path; | |
1768 | path_get(&file->f_path); | |
1769 | } | |
1770 | if (info) | |
1771 | snprintf(info, PROC_FDINFO_MAX, | |
1772 | "pos:\t%lli\n" | |
1773 | "flags:\t0%o\n", | |
1774 | (long long) file->f_pos, | |
1775 | f_flags); | |
1776 | spin_unlock(&files->file_lock); | |
1777 | put_files_struct(files); | |
1778 | return 0; | |
99f89551 | 1779 | } |
5e442a49 LT |
1780 | spin_unlock(&files->file_lock); |
1781 | put_files_struct(files); | |
1782 | } | |
1783 | return -ENOENT; | |
99f89551 EB |
1784 | } |
1785 | ||
7773fbc5 | 1786 | static int proc_fd_link(struct dentry *dentry, struct path *path) |
27932742 | 1787 | { |
7773fbc5 | 1788 | return proc_fd_info(dentry->d_inode, path, NULL); |
27932742 MS |
1789 | } |
1790 | ||
0b728e19 | 1791 | static int tid_fd_revalidate(struct dentry *dentry, unsigned int flags) |
1da177e4 | 1792 | { |
34286d66 NP |
1793 | struct inode *inode; |
1794 | struct task_struct *task; | |
1795 | int fd; | |
1da177e4 | 1796 | struct files_struct *files; |
c69e8d9c | 1797 | const struct cred *cred; |
1da177e4 | 1798 | |
0b728e19 | 1799 | if (flags & LOOKUP_RCU) |
34286d66 NP |
1800 | return -ECHILD; |
1801 | ||
1802 | inode = dentry->d_inode; | |
1803 | task = get_proc_task(inode); | |
1804 | fd = proc_fd(inode); | |
1805 | ||
99f89551 EB |
1806 | if (task) { |
1807 | files = get_files_struct(task); | |
1808 | if (files) { | |
30a08bf2 | 1809 | struct file *file; |
99f89551 | 1810 | rcu_read_lock(); |
30a08bf2 LT |
1811 | file = fcheck_files(files, fd); |
1812 | if (file) { | |
0640113b | 1813 | unsigned f_mode = file->f_mode; |
30a08bf2 | 1814 | |
99f89551 EB |
1815 | rcu_read_unlock(); |
1816 | put_files_struct(files); | |
30a08bf2 | 1817 | |
99f89551 | 1818 | if (task_dumpable(task)) { |
c69e8d9c DH |
1819 | rcu_read_lock(); |
1820 | cred = __task_cred(task); | |
1821 | inode->i_uid = cred->euid; | |
1822 | inode->i_gid = cred->egid; | |
1823 | rcu_read_unlock(); | |
99f89551 | 1824 | } else { |
dcb0f222 EB |
1825 | inode->i_uid = GLOBAL_ROOT_UID; |
1826 | inode->i_gid = GLOBAL_ROOT_GID; | |
99f89551 | 1827 | } |
30a08bf2 | 1828 | |
0640113b LT |
1829 | if (S_ISLNK(inode->i_mode)) { |
1830 | unsigned i_mode = S_IFLNK; | |
1831 | if (f_mode & FMODE_READ) | |
1832 | i_mode |= S_IRUSR | S_IXUSR; | |
1833 | if (f_mode & FMODE_WRITE) | |
1834 | i_mode |= S_IWUSR | S_IXUSR; | |
1835 | inode->i_mode = i_mode; | |
1836 | } | |
30a08bf2 | 1837 | |
99f89551 EB |
1838 | security_task_to_inode(task, inode); |
1839 | put_task_struct(task); | |
1840 | return 1; | |
1841 | } | |
b835996f | 1842 | rcu_read_unlock(); |
1da177e4 | 1843 | put_files_struct(files); |
1da177e4 | 1844 | } |
99f89551 | 1845 | put_task_struct(task); |
1da177e4 LT |
1846 | } |
1847 | d_drop(dentry); | |
1848 | return 0; | |
1849 | } | |
1850 | ||
d72f71eb | 1851 | static const struct dentry_operations tid_fd_dentry_operations = |
1da177e4 LT |
1852 | { |
1853 | .d_revalidate = tid_fd_revalidate, | |
1854 | .d_delete = pid_delete_dentry, | |
1855 | }; | |
1856 | ||
444ceed8 | 1857 | static struct dentry *proc_fd_instantiate(struct inode *dir, |
c5141e6d | 1858 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
1da177e4 | 1859 | { |
af5e6171 | 1860 | unsigned fd = (unsigned long)ptr; |
444ceed8 EB |
1861 | struct inode *inode; |
1862 | struct proc_inode *ei; | |
1863 | struct dentry *error = ERR_PTR(-ENOENT); | |
1da177e4 | 1864 | |
61a28784 | 1865 | inode = proc_pid_make_inode(dir->i_sb, task); |
1da177e4 LT |
1866 | if (!inode) |
1867 | goto out; | |
1868 | ei = PROC_I(inode); | |
aed7a6c4 | 1869 | ei->fd = fd; |
444ceed8 | 1870 | |
0640113b | 1871 | inode->i_mode = S_IFLNK; |
5e442a49 | 1872 | inode->i_op = &proc_pid_link_inode_operations; |
1da177e4 LT |
1873 | inode->i_size = 64; |
1874 | ei->op.proc_get_link = proc_fd_link; | |
fb045adb | 1875 | d_set_d_op(dentry, &tid_fd_dentry_operations); |
1da177e4 | 1876 | d_add(dentry, inode); |
cd6a3ce9 | 1877 | /* Close the race of the process dying before we return the dentry */ |
0b728e19 | 1878 | if (tid_fd_revalidate(dentry, 0)) |
444ceed8 | 1879 | error = NULL; |
1da177e4 | 1880 | |
444ceed8 EB |
1881 | out: |
1882 | return error; | |
1da177e4 LT |
1883 | } |
1884 | ||
27932742 MS |
1885 | static struct dentry *proc_lookupfd_common(struct inode *dir, |
1886 | struct dentry *dentry, | |
1887 | instantiate_t instantiate) | |
444ceed8 EB |
1888 | { |
1889 | struct task_struct *task = get_proc_task(dir); | |
1890 | unsigned fd = name_to_int(dentry); | |
1891 | struct dentry *result = ERR_PTR(-ENOENT); | |
1892 | ||
1893 | if (!task) | |
1894 | goto out_no_task; | |
1895 | if (fd == ~0U) | |
1896 | goto out; | |
1897 | ||
af5e6171 | 1898 | result = instantiate(dir, dentry, task, (void *)(unsigned long)fd); |
444ceed8 EB |
1899 | out: |
1900 | put_task_struct(task); | |
1901 | out_no_task: | |
1902 | return result; | |
1903 | } | |
1904 | ||
27932742 MS |
1905 | static int proc_readfd_common(struct file * filp, void * dirent, |
1906 | filldir_t filldir, instantiate_t instantiate) | |
28a6d671 | 1907 | { |
2fddfeef | 1908 | struct dentry *dentry = filp->f_path.dentry; |
28a6d671 EB |
1909 | struct inode *inode = dentry->d_inode; |
1910 | struct task_struct *p = get_proc_task(inode); | |
457c2510 | 1911 | unsigned int fd, ino; |
28a6d671 | 1912 | int retval; |
28a6d671 | 1913 | struct files_struct * files; |
1da177e4 | 1914 | |
28a6d671 EB |
1915 | retval = -ENOENT; |
1916 | if (!p) | |
1917 | goto out_no_task; | |
1918 | retval = 0; | |
28a6d671 EB |
1919 | |
1920 | fd = filp->f_pos; | |
1921 | switch (fd) { | |
1922 | case 0: | |
1923 | if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0) | |
5e442a49 | 1924 | goto out; |
28a6d671 EB |
1925 | filp->f_pos++; |
1926 | case 1: | |
1927 | ino = parent_ino(dentry); | |
1928 | if (filldir(dirent, "..", 2, 1, ino, DT_DIR) < 0) | |
5e442a49 | 1929 | goto out; |
28a6d671 EB |
1930 | filp->f_pos++; |
1931 | default: | |
1932 | files = get_files_struct(p); | |
1933 | if (!files) | |
5e442a49 | 1934 | goto out; |
28a6d671 | 1935 | rcu_read_lock(); |
28a6d671 | 1936 | for (fd = filp->f_pos-2; |
9b4f526c | 1937 | fd < files_fdtable(files)->max_fds; |
28a6d671 | 1938 | fd++, filp->f_pos++) { |
27932742 MS |
1939 | char name[PROC_NUMBUF]; |
1940 | int len; | |
f05ed3f1 | 1941 | int rv; |
28a6d671 EB |
1942 | |
1943 | if (!fcheck_files(files, fd)) | |
1944 | continue; | |
1945 | rcu_read_unlock(); | |
1946 | ||
27932742 | 1947 | len = snprintf(name, sizeof(name), "%d", fd); |
f05ed3f1 AD |
1948 | rv = proc_fill_cache(filp, dirent, filldir, |
1949 | name, len, instantiate, p, | |
af5e6171 | 1950 | (void *)(unsigned long)fd); |
f05ed3f1 AD |
1951 | if (rv < 0) |
1952 | goto out_fd_loop; | |
28a6d671 EB |
1953 | rcu_read_lock(); |
1954 | } | |
1955 | rcu_read_unlock(); | |
f05ed3f1 | 1956 | out_fd_loop: |
28a6d671 EB |
1957 | put_files_struct(files); |
1958 | } | |
1959 | out: | |
1960 | put_task_struct(p); | |
1961 | out_no_task: | |
1962 | return retval; | |
1963 | } | |
1964 | ||
27932742 | 1965 | static struct dentry *proc_lookupfd(struct inode *dir, struct dentry *dentry, |
00cd8dd3 | 1966 | unsigned int flags) |
27932742 MS |
1967 | { |
1968 | return proc_lookupfd_common(dir, dentry, proc_fd_instantiate); | |
1969 | } | |
1970 | ||
1971 | static int proc_readfd(struct file *filp, void *dirent, filldir_t filldir) | |
1972 | { | |
1973 | return proc_readfd_common(filp, dirent, filldir, proc_fd_instantiate); | |
1974 | } | |
1975 | ||
1976 | static ssize_t proc_fdinfo_read(struct file *file, char __user *buf, | |
1977 | size_t len, loff_t *ppos) | |
1978 | { | |
1979 | char tmp[PROC_FDINFO_MAX]; | |
3dcd25f3 | 1980 | int err = proc_fd_info(file->f_path.dentry->d_inode, NULL, tmp); |
27932742 MS |
1981 | if (!err) |
1982 | err = simple_read_from_buffer(buf, len, ppos, tmp, strlen(tmp)); | |
1983 | return err; | |
1984 | } | |
1985 | ||
1986 | static const struct file_operations proc_fdinfo_file_operations = { | |
87df8424 | 1987 | .open = nonseekable_open, |
27932742 | 1988 | .read = proc_fdinfo_read, |
6038f373 | 1989 | .llseek = no_llseek, |
27932742 MS |
1990 | }; |
1991 | ||
00977a59 | 1992 | static const struct file_operations proc_fd_operations = { |
28a6d671 EB |
1993 | .read = generic_read_dir, |
1994 | .readdir = proc_readfd, | |
6038f373 | 1995 | .llseek = default_llseek, |
1da177e4 LT |
1996 | }; |
1997 | ||
640708a2 PE |
1998 | #ifdef CONFIG_CHECKPOINT_RESTORE |
1999 | ||
2000 | /* | |
2001 | * dname_to_vma_addr - maps a dentry name into two unsigned longs | |
2002 | * which represent vma start and end addresses. | |
2003 | */ | |
2004 | static int dname_to_vma_addr(struct dentry *dentry, | |
2005 | unsigned long *start, unsigned long *end) | |
2006 | { | |
2007 | if (sscanf(dentry->d_name.name, "%lx-%lx", start, end) != 2) | |
2008 | return -EINVAL; | |
2009 | ||
2010 | return 0; | |
2011 | } | |
2012 | ||
0b728e19 | 2013 | static int map_files_d_revalidate(struct dentry *dentry, unsigned int flags) |
640708a2 PE |
2014 | { |
2015 | unsigned long vm_start, vm_end; | |
2016 | bool exact_vma_exists = false; | |
2017 | struct mm_struct *mm = NULL; | |
2018 | struct task_struct *task; | |
2019 | const struct cred *cred; | |
2020 | struct inode *inode; | |
2021 | int status = 0; | |
2022 | ||
0b728e19 | 2023 | if (flags & LOOKUP_RCU) |
640708a2 PE |
2024 | return -ECHILD; |
2025 | ||
2026 | if (!capable(CAP_SYS_ADMIN)) { | |
2027 | status = -EACCES; | |
2028 | goto out_notask; | |
2029 | } | |
2030 | ||
2031 | inode = dentry->d_inode; | |
2032 | task = get_proc_task(inode); | |
2033 | if (!task) | |
2034 | goto out_notask; | |
2035 | ||
2344bec7 CW |
2036 | mm = mm_access(task, PTRACE_MODE_READ); |
2037 | if (IS_ERR_OR_NULL(mm)) | |
640708a2 PE |
2038 | goto out; |
2039 | ||
2040 | if (!dname_to_vma_addr(dentry, &vm_start, &vm_end)) { | |
2041 | down_read(&mm->mmap_sem); | |
2042 | exact_vma_exists = !!find_exact_vma(mm, vm_start, vm_end); | |
2043 | up_read(&mm->mmap_sem); | |
2044 | } | |
2045 | ||
2046 | mmput(mm); | |
2047 | ||
2048 | if (exact_vma_exists) { | |
2049 | if (task_dumpable(task)) { | |
2050 | rcu_read_lock(); | |
2051 | cred = __task_cred(task); | |
2052 | inode->i_uid = cred->euid; | |
2053 | inode->i_gid = cred->egid; | |
2054 | rcu_read_unlock(); | |
2055 | } else { | |
dcb0f222 EB |
2056 | inode->i_uid = GLOBAL_ROOT_UID; |
2057 | inode->i_gid = GLOBAL_ROOT_GID; | |
640708a2 PE |
2058 | } |
2059 | security_task_to_inode(task, inode); | |
2060 | status = 1; | |
2061 | } | |
2062 | ||
2063 | out: | |
2064 | put_task_struct(task); | |
2065 | ||
2066 | out_notask: | |
2067 | if (status <= 0) | |
2068 | d_drop(dentry); | |
2069 | ||
2070 | return status; | |
2071 | } | |
2072 | ||
2073 | static const struct dentry_operations tid_map_files_dentry_operations = { | |
2074 | .d_revalidate = map_files_d_revalidate, | |
2075 | .d_delete = pid_delete_dentry, | |
2076 | }; | |
2077 | ||
2078 | static int proc_map_files_get_link(struct dentry *dentry, struct path *path) | |
2079 | { | |
2080 | unsigned long vm_start, vm_end; | |
2081 | struct vm_area_struct *vma; | |
2082 | struct task_struct *task; | |
2083 | struct mm_struct *mm; | |
2084 | int rc; | |
2085 | ||
2086 | rc = -ENOENT; | |
2087 | task = get_proc_task(dentry->d_inode); | |
2088 | if (!task) | |
2089 | goto out; | |
2090 | ||
2091 | mm = get_task_mm(task); | |
2092 | put_task_struct(task); | |
2093 | if (!mm) | |
2094 | goto out; | |
2095 | ||
2096 | rc = dname_to_vma_addr(dentry, &vm_start, &vm_end); | |
2097 | if (rc) | |
2098 | goto out_mmput; | |
2099 | ||
2100 | down_read(&mm->mmap_sem); | |
2101 | vma = find_exact_vma(mm, vm_start, vm_end); | |
2102 | if (vma && vma->vm_file) { | |
2103 | *path = vma->vm_file->f_path; | |
2104 | path_get(path); | |
2105 | rc = 0; | |
2106 | } | |
2107 | up_read(&mm->mmap_sem); | |
2108 | ||
2109 | out_mmput: | |
2110 | mmput(mm); | |
2111 | out: | |
2112 | return rc; | |
2113 | } | |
2114 | ||
2115 | struct map_files_info { | |
2116 | struct file *file; | |
2117 | unsigned long len; | |
2118 | unsigned char name[4*sizeof(long)+2]; /* max: %lx-%lx\0 */ | |
2119 | }; | |
2120 | ||
2121 | static struct dentry * | |
2122 | proc_map_files_instantiate(struct inode *dir, struct dentry *dentry, | |
2123 | struct task_struct *task, const void *ptr) | |
2124 | { | |
2125 | const struct file *file = ptr; | |
2126 | struct proc_inode *ei; | |
2127 | struct inode *inode; | |
2128 | ||
2129 | if (!file) | |
2130 | return ERR_PTR(-ENOENT); | |
2131 | ||
2132 | inode = proc_pid_make_inode(dir->i_sb, task); | |
2133 | if (!inode) | |
2134 | return ERR_PTR(-ENOENT); | |
2135 | ||
2136 | ei = PROC_I(inode); | |
2137 | ei->op.proc_get_link = proc_map_files_get_link; | |
2138 | ||
2139 | inode->i_op = &proc_pid_link_inode_operations; | |
2140 | inode->i_size = 64; | |
2141 | inode->i_mode = S_IFLNK; | |
2142 | ||
2143 | if (file->f_mode & FMODE_READ) | |
2144 | inode->i_mode |= S_IRUSR; | |
2145 | if (file->f_mode & FMODE_WRITE) | |
2146 | inode->i_mode |= S_IWUSR; | |
2147 | ||
2148 | d_set_d_op(dentry, &tid_map_files_dentry_operations); | |
2149 | d_add(dentry, inode); | |
2150 | ||
2151 | return NULL; | |
2152 | } | |
2153 | ||
2154 | static struct dentry *proc_map_files_lookup(struct inode *dir, | |
00cd8dd3 | 2155 | struct dentry *dentry, unsigned int flags) |
640708a2 PE |
2156 | { |
2157 | unsigned long vm_start, vm_end; | |
2158 | struct vm_area_struct *vma; | |
2159 | struct task_struct *task; | |
2160 | struct dentry *result; | |
2161 | struct mm_struct *mm; | |
2162 | ||
2163 | result = ERR_PTR(-EACCES); | |
2164 | if (!capable(CAP_SYS_ADMIN)) | |
2165 | goto out; | |
2166 | ||
2167 | result = ERR_PTR(-ENOENT); | |
2168 | task = get_proc_task(dir); | |
2169 | if (!task) | |
2170 | goto out; | |
2171 | ||
2172 | result = ERR_PTR(-EACCES); | |
eb94cd96 | 2173 | if (!ptrace_may_access(task, PTRACE_MODE_READ)) |
640708a2 PE |
2174 | goto out_put_task; |
2175 | ||
2176 | result = ERR_PTR(-ENOENT); | |
2177 | if (dname_to_vma_addr(dentry, &vm_start, &vm_end)) | |
eb94cd96 | 2178 | goto out_put_task; |
640708a2 PE |
2179 | |
2180 | mm = get_task_mm(task); | |
2181 | if (!mm) | |
eb94cd96 | 2182 | goto out_put_task; |
640708a2 PE |
2183 | |
2184 | down_read(&mm->mmap_sem); | |
2185 | vma = find_exact_vma(mm, vm_start, vm_end); | |
2186 | if (!vma) | |
2187 | goto out_no_vma; | |
2188 | ||
2189 | result = proc_map_files_instantiate(dir, dentry, task, vma->vm_file); | |
2190 | ||
2191 | out_no_vma: | |
2192 | up_read(&mm->mmap_sem); | |
2193 | mmput(mm); | |
640708a2 PE |
2194 | out_put_task: |
2195 | put_task_struct(task); | |
2196 | out: | |
2197 | return result; | |
2198 | } | |
2199 | ||
2200 | static const struct inode_operations proc_map_files_inode_operations = { | |
2201 | .lookup = proc_map_files_lookup, | |
2202 | .permission = proc_fd_permission, | |
2203 | .setattr = proc_setattr, | |
2204 | }; | |
2205 | ||
2206 | static int | |
2207 | proc_map_files_readdir(struct file *filp, void *dirent, filldir_t filldir) | |
2208 | { | |
2209 | struct dentry *dentry = filp->f_path.dentry; | |
2210 | struct inode *inode = dentry->d_inode; | |
2211 | struct vm_area_struct *vma; | |
2212 | struct task_struct *task; | |
2213 | struct mm_struct *mm; | |
2214 | ino_t ino; | |
2215 | int ret; | |
2216 | ||
2217 | ret = -EACCES; | |
2218 | if (!capable(CAP_SYS_ADMIN)) | |
2219 | goto out; | |
2220 | ||
2221 | ret = -ENOENT; | |
2222 | task = get_proc_task(inode); | |
2223 | if (!task) | |
2224 | goto out; | |
2225 | ||
2226 | ret = -EACCES; | |
eb94cd96 | 2227 | if (!ptrace_may_access(task, PTRACE_MODE_READ)) |
640708a2 PE |
2228 | goto out_put_task; |
2229 | ||
2230 | ret = 0; | |
2231 | switch (filp->f_pos) { | |
2232 | case 0: | |
2233 | ino = inode->i_ino; | |
2234 | if (filldir(dirent, ".", 1, 0, ino, DT_DIR) < 0) | |
eb94cd96 | 2235 | goto out_put_task; |
640708a2 PE |
2236 | filp->f_pos++; |
2237 | case 1: | |
2238 | ino = parent_ino(dentry); | |
2239 | if (filldir(dirent, "..", 2, 1, ino, DT_DIR) < 0) | |
eb94cd96 | 2240 | goto out_put_task; |
640708a2 PE |
2241 | filp->f_pos++; |
2242 | default: | |
2243 | { | |
2244 | unsigned long nr_files, pos, i; | |
2245 | struct flex_array *fa = NULL; | |
2246 | struct map_files_info info; | |
2247 | struct map_files_info *p; | |
2248 | ||
2249 | mm = get_task_mm(task); | |
2250 | if (!mm) | |
eb94cd96 | 2251 | goto out_put_task; |
640708a2 PE |
2252 | down_read(&mm->mmap_sem); |
2253 | ||
2254 | nr_files = 0; | |
2255 | ||
2256 | /* | |
2257 | * We need two passes here: | |
2258 | * | |
2259 | * 1) Collect vmas of mapped files with mmap_sem taken | |
2260 | * 2) Release mmap_sem and instantiate entries | |
2261 | * | |
2262 | * otherwise we get lockdep complained, since filldir() | |
2263 | * routine might require mmap_sem taken in might_fault(). | |
2264 | */ | |
2265 | ||
2266 | for (vma = mm->mmap, pos = 2; vma; vma = vma->vm_next) { | |
2267 | if (vma->vm_file && ++pos > filp->f_pos) | |
2268 | nr_files++; | |
2269 | } | |
2270 | ||
2271 | if (nr_files) { | |
2272 | fa = flex_array_alloc(sizeof(info), nr_files, | |
2273 | GFP_KERNEL); | |
2274 | if (!fa || flex_array_prealloc(fa, 0, nr_files, | |
2275 | GFP_KERNEL)) { | |
2276 | ret = -ENOMEM; | |
2277 | if (fa) | |
2278 | flex_array_free(fa); | |
2279 | up_read(&mm->mmap_sem); | |
2280 | mmput(mm); | |
eb94cd96 | 2281 | goto out_put_task; |
640708a2 PE |
2282 | } |
2283 | for (i = 0, vma = mm->mmap, pos = 2; vma; | |
2284 | vma = vma->vm_next) { | |
2285 | if (!vma->vm_file) | |
2286 | continue; | |
2287 | if (++pos <= filp->f_pos) | |
2288 | continue; | |
2289 | ||
2290 | get_file(vma->vm_file); | |
2291 | info.file = vma->vm_file; | |
2292 | info.len = snprintf(info.name, | |
2293 | sizeof(info.name), "%lx-%lx", | |
2294 | vma->vm_start, vma->vm_end); | |
2295 | if (flex_array_put(fa, i++, &info, GFP_KERNEL)) | |
2296 | BUG(); | |
2297 | } | |
2298 | } | |
2299 | up_read(&mm->mmap_sem); | |
2300 | ||
2301 | for (i = 0; i < nr_files; i++) { | |
2302 | p = flex_array_get(fa, i); | |
2303 | ret = proc_fill_cache(filp, dirent, filldir, | |
2304 | p->name, p->len, | |
2305 | proc_map_files_instantiate, | |
2306 | task, p->file); | |
2307 | if (ret) | |
2308 | break; | |
2309 | filp->f_pos++; | |
2310 | fput(p->file); | |
2311 | } | |
2312 | for (; i < nr_files; i++) { | |
2313 | /* | |
2314 | * In case of error don't forget | |
2315 | * to put rest of file refs. | |
2316 | */ | |
2317 | p = flex_array_get(fa, i); | |
2318 | fput(p->file); | |
2319 | } | |
2320 | if (fa) | |
2321 | flex_array_free(fa); | |
2322 | mmput(mm); | |
2323 | } | |
2324 | } | |
2325 | ||
640708a2 PE |
2326 | out_put_task: |
2327 | put_task_struct(task); | |
2328 | out: | |
2329 | return ret; | |
2330 | } | |
2331 | ||
2332 | static const struct file_operations proc_map_files_operations = { | |
2333 | .read = generic_read_dir, | |
2334 | .readdir = proc_map_files_readdir, | |
2335 | .llseek = default_llseek, | |
2336 | }; | |
2337 | ||
2338 | #endif /* CONFIG_CHECKPOINT_RESTORE */ | |
2339 | ||
8948e11f AD |
2340 | /* |
2341 | * /proc/pid/fd needs a special permission handler so that a process can still | |
2342 | * access /proc/self/fd after it has executed a setuid(). | |
2343 | */ | |
10556cb2 | 2344 | static int proc_fd_permission(struct inode *inode, int mask) |
8948e11f | 2345 | { |
2830ba7f | 2346 | int rv = generic_permission(inode, mask); |
8948e11f AD |
2347 | if (rv == 0) |
2348 | return 0; | |
2349 | if (task_pid(current) == proc_pid(inode)) | |
2350 | rv = 0; | |
2351 | return rv; | |
2352 | } | |
2353 | ||
1da177e4 LT |
2354 | /* |
2355 | * proc directories can do almost nothing.. | |
2356 | */ | |
c5ef1c42 | 2357 | static const struct inode_operations proc_fd_inode_operations = { |
1da177e4 | 2358 | .lookup = proc_lookupfd, |
8948e11f | 2359 | .permission = proc_fd_permission, |
6d76fa58 | 2360 | .setattr = proc_setattr, |
1da177e4 LT |
2361 | }; |
2362 | ||
27932742 MS |
2363 | static struct dentry *proc_fdinfo_instantiate(struct inode *dir, |
2364 | struct dentry *dentry, struct task_struct *task, const void *ptr) | |
2365 | { | |
af5e6171 | 2366 | unsigned fd = (unsigned long)ptr; |
27932742 MS |
2367 | struct inode *inode; |
2368 | struct proc_inode *ei; | |
2369 | struct dentry *error = ERR_PTR(-ENOENT); | |
2370 | ||
2371 | inode = proc_pid_make_inode(dir->i_sb, task); | |
2372 | if (!inode) | |
2373 | goto out; | |
2374 | ei = PROC_I(inode); | |
2375 | ei->fd = fd; | |
2376 | inode->i_mode = S_IFREG | S_IRUSR; | |
2377 | inode->i_fop = &proc_fdinfo_file_operations; | |
fb045adb | 2378 | d_set_d_op(dentry, &tid_fd_dentry_operations); |
27932742 MS |
2379 | d_add(dentry, inode); |
2380 | /* Close the race of the process dying before we return the dentry */ | |
0b728e19 | 2381 | if (tid_fd_revalidate(dentry, 0)) |
27932742 MS |
2382 | error = NULL; |
2383 | ||
2384 | out: | |
2385 | return error; | |
2386 | } | |
2387 | ||
2388 | static struct dentry *proc_lookupfdinfo(struct inode *dir, | |
2389 | struct dentry *dentry, | |
00cd8dd3 | 2390 | unsigned int flags) |
27932742 MS |
2391 | { |
2392 | return proc_lookupfd_common(dir, dentry, proc_fdinfo_instantiate); | |
2393 | } | |
2394 | ||
2395 | static int proc_readfdinfo(struct file *filp, void *dirent, filldir_t filldir) | |
2396 | { | |
2397 | return proc_readfd_common(filp, dirent, filldir, | |
2398 | proc_fdinfo_instantiate); | |
2399 | } | |
2400 | ||
2401 | static const struct file_operations proc_fdinfo_operations = { | |
2402 | .read = generic_read_dir, | |
2403 | .readdir = proc_readfdinfo, | |
6038f373 | 2404 | .llseek = default_llseek, |
27932742 MS |
2405 | }; |
2406 | ||
2407 | /* | |
2408 | * proc directories can do almost nothing.. | |
2409 | */ | |
2410 | static const struct inode_operations proc_fdinfo_inode_operations = { | |
2411 | .lookup = proc_lookupfdinfo, | |
2412 | .setattr = proc_setattr, | |
2413 | }; | |
2414 | ||
2415 | ||
444ceed8 | 2416 | static struct dentry *proc_pident_instantiate(struct inode *dir, |
c5141e6d | 2417 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
444ceed8 | 2418 | { |
c5141e6d | 2419 | const struct pid_entry *p = ptr; |
444ceed8 EB |
2420 | struct inode *inode; |
2421 | struct proc_inode *ei; | |
bd6daba9 | 2422 | struct dentry *error = ERR_PTR(-ENOENT); |
444ceed8 | 2423 | |
61a28784 | 2424 | inode = proc_pid_make_inode(dir->i_sb, task); |
444ceed8 EB |
2425 | if (!inode) |
2426 | goto out; | |
2427 | ||
2428 | ei = PROC_I(inode); | |
2429 | inode->i_mode = p->mode; | |
2430 | if (S_ISDIR(inode->i_mode)) | |
bfe86848 | 2431 | set_nlink(inode, 2); /* Use getattr to fix if necessary */ |
444ceed8 EB |
2432 | if (p->iop) |
2433 | inode->i_op = p->iop; | |
2434 | if (p->fop) | |
2435 | inode->i_fop = p->fop; | |
2436 | ei->op = p->op; | |
fb045adb | 2437 | d_set_d_op(dentry, &pid_dentry_operations); |
444ceed8 EB |
2438 | d_add(dentry, inode); |
2439 | /* Close the race of the process dying before we return the dentry */ | |
0b728e19 | 2440 | if (pid_revalidate(dentry, 0)) |
444ceed8 EB |
2441 | error = NULL; |
2442 | out: | |
2443 | return error; | |
2444 | } | |
2445 | ||
1da177e4 LT |
2446 | static struct dentry *proc_pident_lookup(struct inode *dir, |
2447 | struct dentry *dentry, | |
c5141e6d | 2448 | const struct pid_entry *ents, |
7bcd6b0e | 2449 | unsigned int nents) |
1da177e4 | 2450 | { |
cd6a3ce9 | 2451 | struct dentry *error; |
99f89551 | 2452 | struct task_struct *task = get_proc_task(dir); |
c5141e6d | 2453 | const struct pid_entry *p, *last; |
1da177e4 | 2454 | |
cd6a3ce9 | 2455 | error = ERR_PTR(-ENOENT); |
1da177e4 | 2456 | |
99f89551 EB |
2457 | if (!task) |
2458 | goto out_no_task; | |
1da177e4 | 2459 | |
20cdc894 EB |
2460 | /* |
2461 | * Yes, it does not scale. And it should not. Don't add | |
2462 | * new entries into /proc/<tgid>/ without very good reasons. | |
2463 | */ | |
7bcd6b0e EB |
2464 | last = &ents[nents - 1]; |
2465 | for (p = ents; p <= last; p++) { | |
1da177e4 LT |
2466 | if (p->len != dentry->d_name.len) |
2467 | continue; | |
2468 | if (!memcmp(dentry->d_name.name, p->name, p->len)) | |
2469 | break; | |
2470 | } | |
7bcd6b0e | 2471 | if (p > last) |
1da177e4 LT |
2472 | goto out; |
2473 | ||
444ceed8 | 2474 | error = proc_pident_instantiate(dir, dentry, task, p); |
1da177e4 | 2475 | out: |
99f89551 EB |
2476 | put_task_struct(task); |
2477 | out_no_task: | |
cd6a3ce9 | 2478 | return error; |
1da177e4 LT |
2479 | } |
2480 | ||
c5141e6d ED |
2481 | static int proc_pident_fill_cache(struct file *filp, void *dirent, |
2482 | filldir_t filldir, struct task_struct *task, const struct pid_entry *p) | |
61a28784 EB |
2483 | { |
2484 | return proc_fill_cache(filp, dirent, filldir, p->name, p->len, | |
2485 | proc_pident_instantiate, task, p); | |
2486 | } | |
2487 | ||
28a6d671 EB |
2488 | static int proc_pident_readdir(struct file *filp, |
2489 | void *dirent, filldir_t filldir, | |
c5141e6d | 2490 | const struct pid_entry *ents, unsigned int nents) |
28a6d671 EB |
2491 | { |
2492 | int i; | |
2fddfeef | 2493 | struct dentry *dentry = filp->f_path.dentry; |
28a6d671 EB |
2494 | struct inode *inode = dentry->d_inode; |
2495 | struct task_struct *task = get_proc_task(inode); | |
c5141e6d | 2496 | const struct pid_entry *p, *last; |
28a6d671 EB |
2497 | ino_t ino; |
2498 | int ret; | |
2499 | ||
2500 | ret = -ENOENT; | |
2501 | if (!task) | |
61a28784 | 2502 | goto out_no_task; |
28a6d671 EB |
2503 | |
2504 | ret = 0; | |
28a6d671 EB |
2505 | i = filp->f_pos; |
2506 | switch (i) { | |
2507 | case 0: | |
2508 | ino = inode->i_ino; | |
2509 | if (filldir(dirent, ".", 1, i, ino, DT_DIR) < 0) | |
2510 | goto out; | |
2511 | i++; | |
2512 | filp->f_pos++; | |
2513 | /* fall through */ | |
2514 | case 1: | |
2515 | ino = parent_ino(dentry); | |
2516 | if (filldir(dirent, "..", 2, i, ino, DT_DIR) < 0) | |
2517 | goto out; | |
2518 | i++; | |
2519 | filp->f_pos++; | |
2520 | /* fall through */ | |
2521 | default: | |
2522 | i -= 2; | |
2523 | if (i >= nents) { | |
2524 | ret = 1; | |
2525 | goto out; | |
2526 | } | |
2527 | p = ents + i; | |
7bcd6b0e EB |
2528 | last = &ents[nents - 1]; |
2529 | while (p <= last) { | |
61a28784 | 2530 | if (proc_pident_fill_cache(filp, dirent, filldir, task, p) < 0) |
28a6d671 EB |
2531 | goto out; |
2532 | filp->f_pos++; | |
2533 | p++; | |
2534 | } | |
2535 | } | |
2536 | ||
2537 | ret = 1; | |
2538 | out: | |
61a28784 EB |
2539 | put_task_struct(task); |
2540 | out_no_task: | |
28a6d671 | 2541 | return ret; |
1da177e4 LT |
2542 | } |
2543 | ||
28a6d671 EB |
2544 | #ifdef CONFIG_SECURITY |
2545 | static ssize_t proc_pid_attr_read(struct file * file, char __user * buf, | |
2546 | size_t count, loff_t *ppos) | |
2547 | { | |
2fddfeef | 2548 | struct inode * inode = file->f_path.dentry->d_inode; |
04ff9708 | 2549 | char *p = NULL; |
28a6d671 EB |
2550 | ssize_t length; |
2551 | struct task_struct *task = get_proc_task(inode); | |
2552 | ||
28a6d671 | 2553 | if (!task) |
04ff9708 | 2554 | return -ESRCH; |
28a6d671 EB |
2555 | |
2556 | length = security_getprocattr(task, | |
2fddfeef | 2557 | (char*)file->f_path.dentry->d_name.name, |
04ff9708 | 2558 | &p); |
28a6d671 | 2559 | put_task_struct(task); |
04ff9708 AV |
2560 | if (length > 0) |
2561 | length = simple_read_from_buffer(buf, count, ppos, p, length); | |
2562 | kfree(p); | |
28a6d671 | 2563 | return length; |
1da177e4 LT |
2564 | } |
2565 | ||
28a6d671 EB |
2566 | static ssize_t proc_pid_attr_write(struct file * file, const char __user * buf, |
2567 | size_t count, loff_t *ppos) | |
2568 | { | |
2fddfeef | 2569 | struct inode * inode = file->f_path.dentry->d_inode; |
28a6d671 EB |
2570 | char *page; |
2571 | ssize_t length; | |
2572 | struct task_struct *task = get_proc_task(inode); | |
2573 | ||
2574 | length = -ESRCH; | |
2575 | if (!task) | |
2576 | goto out_no_task; | |
2577 | if (count > PAGE_SIZE) | |
2578 | count = PAGE_SIZE; | |
2579 | ||
2580 | /* No partial writes. */ | |
2581 | length = -EINVAL; | |
2582 | if (*ppos != 0) | |
2583 | goto out; | |
2584 | ||
2585 | length = -ENOMEM; | |
e12ba74d | 2586 | page = (char*)__get_free_page(GFP_TEMPORARY); |
28a6d671 EB |
2587 | if (!page) |
2588 | goto out; | |
2589 | ||
2590 | length = -EFAULT; | |
2591 | if (copy_from_user(page, buf, count)) | |
2592 | goto out_free; | |
2593 | ||
107db7c7 | 2594 | /* Guard against adverse ptrace interaction */ |
9b1bf12d | 2595 | length = mutex_lock_interruptible(&task->signal->cred_guard_mutex); |
107db7c7 DH |
2596 | if (length < 0) |
2597 | goto out_free; | |
2598 | ||
28a6d671 | 2599 | length = security_setprocattr(task, |
2fddfeef | 2600 | (char*)file->f_path.dentry->d_name.name, |
28a6d671 | 2601 | (void*)page, count); |
9b1bf12d | 2602 | mutex_unlock(&task->signal->cred_guard_mutex); |
28a6d671 EB |
2603 | out_free: |
2604 | free_page((unsigned long) page); | |
2605 | out: | |
2606 | put_task_struct(task); | |
2607 | out_no_task: | |
2608 | return length; | |
2609 | } | |
2610 | ||
00977a59 | 2611 | static const struct file_operations proc_pid_attr_operations = { |
28a6d671 EB |
2612 | .read = proc_pid_attr_read, |
2613 | .write = proc_pid_attr_write, | |
87df8424 | 2614 | .llseek = generic_file_llseek, |
28a6d671 EB |
2615 | }; |
2616 | ||
c5141e6d | 2617 | static const struct pid_entry attr_dir_stuff[] = { |
631f9c18 AD |
2618 | REG("current", S_IRUGO|S_IWUGO, proc_pid_attr_operations), |
2619 | REG("prev", S_IRUGO, proc_pid_attr_operations), | |
2620 | REG("exec", S_IRUGO|S_IWUGO, proc_pid_attr_operations), | |
2621 | REG("fscreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations), | |
2622 | REG("keycreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations), | |
2623 | REG("sockcreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations), | |
28a6d671 EB |
2624 | }; |
2625 | ||
72d9dcfc | 2626 | static int proc_attr_dir_readdir(struct file * filp, |
28a6d671 EB |
2627 | void * dirent, filldir_t filldir) |
2628 | { | |
2629 | return proc_pident_readdir(filp,dirent,filldir, | |
72d9dcfc | 2630 | attr_dir_stuff,ARRAY_SIZE(attr_dir_stuff)); |
28a6d671 EB |
2631 | } |
2632 | ||
00977a59 | 2633 | static const struct file_operations proc_attr_dir_operations = { |
1da177e4 | 2634 | .read = generic_read_dir, |
72d9dcfc | 2635 | .readdir = proc_attr_dir_readdir, |
6038f373 | 2636 | .llseek = default_llseek, |
1da177e4 LT |
2637 | }; |
2638 | ||
72d9dcfc | 2639 | static struct dentry *proc_attr_dir_lookup(struct inode *dir, |
00cd8dd3 | 2640 | struct dentry *dentry, unsigned int flags) |
28a6d671 | 2641 | { |
7bcd6b0e EB |
2642 | return proc_pident_lookup(dir, dentry, |
2643 | attr_dir_stuff, ARRAY_SIZE(attr_dir_stuff)); | |
28a6d671 EB |
2644 | } |
2645 | ||
c5ef1c42 | 2646 | static const struct inode_operations proc_attr_dir_inode_operations = { |
72d9dcfc | 2647 | .lookup = proc_attr_dir_lookup, |
99f89551 | 2648 | .getattr = pid_getattr, |
6d76fa58 | 2649 | .setattr = proc_setattr, |
1da177e4 LT |
2650 | }; |
2651 | ||
28a6d671 EB |
2652 | #endif |
2653 | ||
698ba7b5 | 2654 | #ifdef CONFIG_ELF_CORE |
3cb4a0bb KH |
2655 | static ssize_t proc_coredump_filter_read(struct file *file, char __user *buf, |
2656 | size_t count, loff_t *ppos) | |
2657 | { | |
2658 | struct task_struct *task = get_proc_task(file->f_dentry->d_inode); | |
2659 | struct mm_struct *mm; | |
2660 | char buffer[PROC_NUMBUF]; | |
2661 | size_t len; | |
2662 | int ret; | |
2663 | ||
2664 | if (!task) | |
2665 | return -ESRCH; | |
2666 | ||
2667 | ret = 0; | |
2668 | mm = get_task_mm(task); | |
2669 | if (mm) { | |
2670 | len = snprintf(buffer, sizeof(buffer), "%08lx\n", | |
2671 | ((mm->flags & MMF_DUMP_FILTER_MASK) >> | |
2672 | MMF_DUMP_FILTER_SHIFT)); | |
2673 | mmput(mm); | |
2674 | ret = simple_read_from_buffer(buf, count, ppos, buffer, len); | |
2675 | } | |
2676 | ||
2677 | put_task_struct(task); | |
2678 | ||
2679 | return ret; | |
2680 | } | |
2681 | ||
2682 | static ssize_t proc_coredump_filter_write(struct file *file, | |
2683 | const char __user *buf, | |
2684 | size_t count, | |
2685 | loff_t *ppos) | |
2686 | { | |
2687 | struct task_struct *task; | |
2688 | struct mm_struct *mm; | |
2689 | char buffer[PROC_NUMBUF], *end; | |
2690 | unsigned int val; | |
2691 | int ret; | |
2692 | int i; | |
2693 | unsigned long mask; | |
2694 | ||
2695 | ret = -EFAULT; | |
2696 | memset(buffer, 0, sizeof(buffer)); | |
2697 | if (count > sizeof(buffer) - 1) | |
2698 | count = sizeof(buffer) - 1; | |
2699 | if (copy_from_user(buffer, buf, count)) | |
2700 | goto out_no_task; | |
2701 | ||
2702 | ret = -EINVAL; | |
2703 | val = (unsigned int)simple_strtoul(buffer, &end, 0); | |
2704 | if (*end == '\n') | |
2705 | end++; | |
2706 | if (end - buffer == 0) | |
2707 | goto out_no_task; | |
2708 | ||
2709 | ret = -ESRCH; | |
2710 | task = get_proc_task(file->f_dentry->d_inode); | |
2711 | if (!task) | |
2712 | goto out_no_task; | |
2713 | ||
2714 | ret = end - buffer; | |
2715 | mm = get_task_mm(task); | |
2716 | if (!mm) | |
2717 | goto out_no_mm; | |
2718 | ||
2719 | for (i = 0, mask = 1; i < MMF_DUMP_FILTER_BITS; i++, mask <<= 1) { | |
2720 | if (val & mask) | |
2721 | set_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags); | |
2722 | else | |
2723 | clear_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags); | |
2724 | } | |
2725 | ||
2726 | mmput(mm); | |
2727 | out_no_mm: | |
2728 | put_task_struct(task); | |
2729 | out_no_task: | |
2730 | return ret; | |
2731 | } | |
2732 | ||
2733 | static const struct file_operations proc_coredump_filter_operations = { | |
2734 | .read = proc_coredump_filter_read, | |
2735 | .write = proc_coredump_filter_write, | |
87df8424 | 2736 | .llseek = generic_file_llseek, |
3cb4a0bb KH |
2737 | }; |
2738 | #endif | |
2739 | ||
28a6d671 EB |
2740 | /* |
2741 | * /proc/self: | |
2742 | */ | |
2743 | static int proc_self_readlink(struct dentry *dentry, char __user *buffer, | |
2744 | int buflen) | |
2745 | { | |
488e5bc4 | 2746 | struct pid_namespace *ns = dentry->d_sb->s_fs_info; |
b55fcb22 | 2747 | pid_t tgid = task_tgid_nr_ns(current, ns); |
28a6d671 | 2748 | char tmp[PROC_NUMBUF]; |
b55fcb22 | 2749 | if (!tgid) |
488e5bc4 | 2750 | return -ENOENT; |
b55fcb22 | 2751 | sprintf(tmp, "%d", tgid); |
28a6d671 EB |
2752 | return vfs_readlink(dentry,buffer,buflen,tmp); |
2753 | } | |
2754 | ||
2755 | static void *proc_self_follow_link(struct dentry *dentry, struct nameidata *nd) | |
2756 | { | |
488e5bc4 | 2757 | struct pid_namespace *ns = dentry->d_sb->s_fs_info; |
b55fcb22 | 2758 | pid_t tgid = task_tgid_nr_ns(current, ns); |
7fee4868 AV |
2759 | char *name = ERR_PTR(-ENOENT); |
2760 | if (tgid) { | |
2761 | name = __getname(); | |
2762 | if (!name) | |
2763 | name = ERR_PTR(-ENOMEM); | |
2764 | else | |
2765 | sprintf(name, "%d", tgid); | |
2766 | } | |
2767 | nd_set_link(nd, name); | |
2768 | return NULL; | |
2769 | } | |
2770 | ||
2771 | static void proc_self_put_link(struct dentry *dentry, struct nameidata *nd, | |
2772 | void *cookie) | |
2773 | { | |
2774 | char *s = nd_get_link(nd); | |
2775 | if (!IS_ERR(s)) | |
2776 | __putname(s); | |
28a6d671 EB |
2777 | } |
2778 | ||
c5ef1c42 | 2779 | static const struct inode_operations proc_self_inode_operations = { |
28a6d671 EB |
2780 | .readlink = proc_self_readlink, |
2781 | .follow_link = proc_self_follow_link, | |
7fee4868 | 2782 | .put_link = proc_self_put_link, |
28a6d671 EB |
2783 | }; |
2784 | ||
801199ce EB |
2785 | /* |
2786 | * proc base | |
2787 | * | |
2788 | * These are the directory entries in the root directory of /proc | |
2789 | * that properly belong to the /proc filesystem, as they describe | |
2790 | * describe something that is process related. | |
2791 | */ | |
c5141e6d | 2792 | static const struct pid_entry proc_base_stuff[] = { |
61a28784 | 2793 | NOD("self", S_IFLNK|S_IRWXUGO, |
801199ce | 2794 | &proc_self_inode_operations, NULL, {}), |
801199ce EB |
2795 | }; |
2796 | ||
444ceed8 | 2797 | static struct dentry *proc_base_instantiate(struct inode *dir, |
c5141e6d | 2798 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
801199ce | 2799 | { |
c5141e6d | 2800 | const struct pid_entry *p = ptr; |
801199ce | 2801 | struct inode *inode; |
801199ce | 2802 | struct proc_inode *ei; |
73d36460 | 2803 | struct dentry *error; |
801199ce EB |
2804 | |
2805 | /* Allocate the inode */ | |
2806 | error = ERR_PTR(-ENOMEM); | |
2807 | inode = new_inode(dir->i_sb); | |
2808 | if (!inode) | |
2809 | goto out; | |
2810 | ||
2811 | /* Initialize the inode */ | |
2812 | ei = PROC_I(inode); | |
85fe4025 | 2813 | inode->i_ino = get_next_ino(); |
801199ce | 2814 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; |
801199ce EB |
2815 | |
2816 | /* | |
2817 | * grab the reference to the task. | |
2818 | */ | |
1a657f78 | 2819 | ei->pid = get_task_pid(task, PIDTYPE_PID); |
801199ce EB |
2820 | if (!ei->pid) |
2821 | goto out_iput; | |
2822 | ||
801199ce EB |
2823 | inode->i_mode = p->mode; |
2824 | if (S_ISDIR(inode->i_mode)) | |
bfe86848 | 2825 | set_nlink(inode, 2); |
801199ce EB |
2826 | if (S_ISLNK(inode->i_mode)) |
2827 | inode->i_size = 64; | |
2828 | if (p->iop) | |
2829 | inode->i_op = p->iop; | |
2830 | if (p->fop) | |
2831 | inode->i_fop = p->fop; | |
2832 | ei->op = p->op; | |
801199ce EB |
2833 | d_add(dentry, inode); |
2834 | error = NULL; | |
2835 | out: | |
801199ce EB |
2836 | return error; |
2837 | out_iput: | |
2838 | iput(inode); | |
2839 | goto out; | |
2840 | } | |
2841 | ||
444ceed8 EB |
2842 | static struct dentry *proc_base_lookup(struct inode *dir, struct dentry *dentry) |
2843 | { | |
2844 | struct dentry *error; | |
2845 | struct task_struct *task = get_proc_task(dir); | |
c5141e6d | 2846 | const struct pid_entry *p, *last; |
444ceed8 EB |
2847 | |
2848 | error = ERR_PTR(-ENOENT); | |
2849 | ||
2850 | if (!task) | |
2851 | goto out_no_task; | |
2852 | ||
2853 | /* Lookup the directory entry */ | |
7bcd6b0e EB |
2854 | last = &proc_base_stuff[ARRAY_SIZE(proc_base_stuff) - 1]; |
2855 | for (p = proc_base_stuff; p <= last; p++) { | |
444ceed8 EB |
2856 | if (p->len != dentry->d_name.len) |
2857 | continue; | |
2858 | if (!memcmp(dentry->d_name.name, p->name, p->len)) | |
2859 | break; | |
2860 | } | |
7bcd6b0e | 2861 | if (p > last) |
444ceed8 EB |
2862 | goto out; |
2863 | ||
2864 | error = proc_base_instantiate(dir, dentry, task, p); | |
2865 | ||
2866 | out: | |
2867 | put_task_struct(task); | |
2868 | out_no_task: | |
2869 | return error; | |
2870 | } | |
2871 | ||
c5141e6d ED |
2872 | static int proc_base_fill_cache(struct file *filp, void *dirent, |
2873 | filldir_t filldir, struct task_struct *task, const struct pid_entry *p) | |
61a28784 EB |
2874 | { |
2875 | return proc_fill_cache(filp, dirent, filldir, p->name, p->len, | |
2876 | proc_base_instantiate, task, p); | |
2877 | } | |
2878 | ||
aba76fdb | 2879 | #ifdef CONFIG_TASK_IO_ACCOUNTING |
297c5d92 AR |
2880 | static int do_io_accounting(struct task_struct *task, char *buffer, int whole) |
2881 | { | |
940389b8 | 2882 | struct task_io_accounting acct = task->ioac; |
5995477a | 2883 | unsigned long flags; |
293eb1e7 | 2884 | int result; |
5995477a | 2885 | |
293eb1e7 VK |
2886 | result = mutex_lock_killable(&task->signal->cred_guard_mutex); |
2887 | if (result) | |
2888 | return result; | |
2889 | ||
2890 | if (!ptrace_may_access(task, PTRACE_MODE_READ)) { | |
2891 | result = -EACCES; | |
2892 | goto out_unlock; | |
2893 | } | |
1d1221f3 | 2894 | |
5995477a AR |
2895 | if (whole && lock_task_sighand(task, &flags)) { |
2896 | struct task_struct *t = task; | |
2897 | ||
2898 | task_io_accounting_add(&acct, &task->signal->ioac); | |
2899 | while_each_thread(task, t) | |
2900 | task_io_accounting_add(&acct, &t->ioac); | |
2901 | ||
2902 | unlock_task_sighand(task, &flags); | |
297c5d92 | 2903 | } |
293eb1e7 | 2904 | result = sprintf(buffer, |
aba76fdb AM |
2905 | "rchar: %llu\n" |
2906 | "wchar: %llu\n" | |
2907 | "syscr: %llu\n" | |
2908 | "syscw: %llu\n" | |
2909 | "read_bytes: %llu\n" | |
2910 | "write_bytes: %llu\n" | |
2911 | "cancelled_write_bytes: %llu\n", | |
7c44319d AB |
2912 | (unsigned long long)acct.rchar, |
2913 | (unsigned long long)acct.wchar, | |
2914 | (unsigned long long)acct.syscr, | |
2915 | (unsigned long long)acct.syscw, | |
2916 | (unsigned long long)acct.read_bytes, | |
2917 | (unsigned long long)acct.write_bytes, | |
2918 | (unsigned long long)acct.cancelled_write_bytes); | |
293eb1e7 VK |
2919 | out_unlock: |
2920 | mutex_unlock(&task->signal->cred_guard_mutex); | |
2921 | return result; | |
297c5d92 AR |
2922 | } |
2923 | ||
2924 | static int proc_tid_io_accounting(struct task_struct *task, char *buffer) | |
2925 | { | |
2926 | return do_io_accounting(task, buffer, 0); | |
aba76fdb | 2927 | } |
297c5d92 AR |
2928 | |
2929 | static int proc_tgid_io_accounting(struct task_struct *task, char *buffer) | |
2930 | { | |
2931 | return do_io_accounting(task, buffer, 1); | |
2932 | } | |
2933 | #endif /* CONFIG_TASK_IO_ACCOUNTING */ | |
aba76fdb | 2934 | |
22d917d8 EB |
2935 | #ifdef CONFIG_USER_NS |
2936 | static int proc_id_map_open(struct inode *inode, struct file *file, | |
2937 | struct seq_operations *seq_ops) | |
2938 | { | |
2939 | struct user_namespace *ns = NULL; | |
2940 | struct task_struct *task; | |
2941 | struct seq_file *seq; | |
2942 | int ret = -EINVAL; | |
2943 | ||
2944 | task = get_proc_task(inode); | |
2945 | if (task) { | |
2946 | rcu_read_lock(); | |
2947 | ns = get_user_ns(task_cred_xxx(task, user_ns)); | |
2948 | rcu_read_unlock(); | |
2949 | put_task_struct(task); | |
2950 | } | |
2951 | if (!ns) | |
2952 | goto err; | |
2953 | ||
2954 | ret = seq_open(file, seq_ops); | |
2955 | if (ret) | |
2956 | goto err_put_ns; | |
2957 | ||
2958 | seq = file->private_data; | |
2959 | seq->private = ns; | |
2960 | ||
2961 | return 0; | |
2962 | err_put_ns: | |
2963 | put_user_ns(ns); | |
2964 | err: | |
2965 | return ret; | |
2966 | } | |
2967 | ||
2968 | static int proc_id_map_release(struct inode *inode, struct file *file) | |
2969 | { | |
2970 | struct seq_file *seq = file->private_data; | |
2971 | struct user_namespace *ns = seq->private; | |
2972 | put_user_ns(ns); | |
2973 | return seq_release(inode, file); | |
2974 | } | |
2975 | ||
2976 | static int proc_uid_map_open(struct inode *inode, struct file *file) | |
2977 | { | |
2978 | return proc_id_map_open(inode, file, &proc_uid_seq_operations); | |
2979 | } | |
2980 | ||
2981 | static int proc_gid_map_open(struct inode *inode, struct file *file) | |
2982 | { | |
2983 | return proc_id_map_open(inode, file, &proc_gid_seq_operations); | |
2984 | } | |
2985 | ||
2986 | static const struct file_operations proc_uid_map_operations = { | |
2987 | .open = proc_uid_map_open, | |
2988 | .write = proc_uid_map_write, | |
2989 | .read = seq_read, | |
2990 | .llseek = seq_lseek, | |
2991 | .release = proc_id_map_release, | |
2992 | }; | |
2993 | ||
2994 | static const struct file_operations proc_gid_map_operations = { | |
2995 | .open = proc_gid_map_open, | |
2996 | .write = proc_gid_map_write, | |
2997 | .read = seq_read, | |
2998 | .llseek = seq_lseek, | |
2999 | .release = proc_id_map_release, | |
3000 | }; | |
3001 | #endif /* CONFIG_USER_NS */ | |
3002 | ||
47830723 KC |
3003 | static int proc_pid_personality(struct seq_file *m, struct pid_namespace *ns, |
3004 | struct pid *pid, struct task_struct *task) | |
3005 | { | |
a9712bc1 AV |
3006 | int err = lock_trace(task); |
3007 | if (!err) { | |
3008 | seq_printf(m, "%08x\n", task->personality); | |
3009 | unlock_trace(task); | |
3010 | } | |
3011 | return err; | |
47830723 KC |
3012 | } |
3013 | ||
28a6d671 EB |
3014 | /* |
3015 | * Thread groups | |
3016 | */ | |
00977a59 | 3017 | static const struct file_operations proc_task_operations; |
c5ef1c42 | 3018 | static const struct inode_operations proc_task_inode_operations; |
20cdc894 | 3019 | |
c5141e6d | 3020 | static const struct pid_entry tgid_base_stuff[] = { |
631f9c18 AD |
3021 | DIR("task", S_IRUGO|S_IXUGO, proc_task_inode_operations, proc_task_operations), |
3022 | DIR("fd", S_IRUSR|S_IXUSR, proc_fd_inode_operations, proc_fd_operations), | |
640708a2 PE |
3023 | #ifdef CONFIG_CHECKPOINT_RESTORE |
3024 | DIR("map_files", S_IRUSR|S_IXUSR, proc_map_files_inode_operations, proc_map_files_operations), | |
3025 | #endif | |
631f9c18 | 3026 | DIR("fdinfo", S_IRUSR|S_IXUSR, proc_fdinfo_inode_operations, proc_fdinfo_operations), |
6b4e306a | 3027 | DIR("ns", S_IRUSR|S_IXUGO, proc_ns_dir_inode_operations, proc_ns_dir_operations), |
b2211a36 | 3028 | #ifdef CONFIG_NET |
631f9c18 | 3029 | DIR("net", S_IRUGO|S_IXUGO, proc_net_inode_operations, proc_net_operations), |
b2211a36 | 3030 | #endif |
631f9c18 AD |
3031 | REG("environ", S_IRUSR, proc_environ_operations), |
3032 | INF("auxv", S_IRUSR, proc_pid_auxv), | |
3033 | ONE("status", S_IRUGO, proc_pid_status), | |
a9712bc1 | 3034 | ONE("personality", S_IRUGO, proc_pid_personality), |
3036e7b4 | 3035 | INF("limits", S_IRUGO, proc_pid_limits), |
43ae34cb | 3036 | #ifdef CONFIG_SCHED_DEBUG |
631f9c18 | 3037 | REG("sched", S_IRUGO|S_IWUSR, proc_pid_sched_operations), |
5091faa4 MG |
3038 | #endif |
3039 | #ifdef CONFIG_SCHED_AUTOGROUP | |
3040 | REG("autogroup", S_IRUGO|S_IWUSR, proc_pid_sched_autogroup_operations), | |
ebcb6734 | 3041 | #endif |
4614a696 | 3042 | REG("comm", S_IRUGO|S_IWUSR, proc_pid_set_comm_operations), |
ebcb6734 | 3043 | #ifdef CONFIG_HAVE_ARCH_TRACEHOOK |
a9712bc1 | 3044 | INF("syscall", S_IRUGO, proc_pid_syscall), |
43ae34cb | 3045 | #endif |
631f9c18 AD |
3046 | INF("cmdline", S_IRUGO, proc_pid_cmdline), |
3047 | ONE("stat", S_IRUGO, proc_tgid_stat), | |
3048 | ONE("statm", S_IRUGO, proc_pid_statm), | |
b7643757 | 3049 | REG("maps", S_IRUGO, proc_pid_maps_operations), |
28a6d671 | 3050 | #ifdef CONFIG_NUMA |
b7643757 | 3051 | REG("numa_maps", S_IRUGO, proc_pid_numa_maps_operations), |
28a6d671 | 3052 | #endif |
631f9c18 AD |
3053 | REG("mem", S_IRUSR|S_IWUSR, proc_mem_operations), |
3054 | LNK("cwd", proc_cwd_link), | |
3055 | LNK("root", proc_root_link), | |
3056 | LNK("exe", proc_exe_link), | |
3057 | REG("mounts", S_IRUGO, proc_mounts_operations), | |
3058 | REG("mountinfo", S_IRUGO, proc_mountinfo_operations), | |
3059 | REG("mountstats", S_IRUSR, proc_mountstats_operations), | |
1e883281 | 3060 | #ifdef CONFIG_PROC_PAGE_MONITOR |
631f9c18 | 3061 | REG("clear_refs", S_IWUSR, proc_clear_refs_operations), |
b7643757 | 3062 | REG("smaps", S_IRUGO, proc_pid_smaps_operations), |
ca6b0bf0 | 3063 | REG("pagemap", S_IRUGO, proc_pagemap_operations), |
28a6d671 EB |
3064 | #endif |
3065 | #ifdef CONFIG_SECURITY | |
631f9c18 | 3066 | DIR("attr", S_IRUGO|S_IXUGO, proc_attr_dir_inode_operations, proc_attr_dir_operations), |
28a6d671 EB |
3067 | #endif |
3068 | #ifdef CONFIG_KALLSYMS | |
631f9c18 | 3069 | INF("wchan", S_IRUGO, proc_pid_wchan), |
28a6d671 | 3070 | #endif |
2ec220e2 | 3071 | #ifdef CONFIG_STACKTRACE |
a9712bc1 | 3072 | ONE("stack", S_IRUGO, proc_pid_stack), |
28a6d671 EB |
3073 | #endif |
3074 | #ifdef CONFIG_SCHEDSTATS | |
631f9c18 | 3075 | INF("schedstat", S_IRUGO, proc_pid_schedstat), |
28a6d671 | 3076 | #endif |
9745512c | 3077 | #ifdef CONFIG_LATENCYTOP |
631f9c18 | 3078 | REG("latency", S_IRUGO, proc_lstats_operations), |
9745512c | 3079 | #endif |
8793d854 | 3080 | #ifdef CONFIG_PROC_PID_CPUSET |
631f9c18 | 3081 | REG("cpuset", S_IRUGO, proc_cpuset_operations), |
a424316c PM |
3082 | #endif |
3083 | #ifdef CONFIG_CGROUPS | |
631f9c18 | 3084 | REG("cgroup", S_IRUGO, proc_cgroup_operations), |
28a6d671 | 3085 | #endif |
631f9c18 AD |
3086 | INF("oom_score", S_IRUGO, proc_oom_score), |
3087 | REG("oom_adj", S_IRUGO|S_IWUSR, proc_oom_adjust_operations), | |
a63d83f4 | 3088 | REG("oom_score_adj", S_IRUGO|S_IWUSR, proc_oom_score_adj_operations), |
28a6d671 | 3089 | #ifdef CONFIG_AUDITSYSCALL |
631f9c18 AD |
3090 | REG("loginuid", S_IWUSR|S_IRUGO, proc_loginuid_operations), |
3091 | REG("sessionid", S_IRUGO, proc_sessionid_operations), | |
28a6d671 | 3092 | #endif |
f4f154fd | 3093 | #ifdef CONFIG_FAULT_INJECTION |
631f9c18 | 3094 | REG("make-it-fail", S_IRUGO|S_IWUSR, proc_fault_inject_operations), |
f4f154fd | 3095 | #endif |
698ba7b5 | 3096 | #ifdef CONFIG_ELF_CORE |
631f9c18 | 3097 | REG("coredump_filter", S_IRUGO|S_IWUSR, proc_coredump_filter_operations), |
3cb4a0bb | 3098 | #endif |
aba76fdb | 3099 | #ifdef CONFIG_TASK_IO_ACCOUNTING |
1d1221f3 | 3100 | INF("io", S_IRUSR, proc_tgid_io_accounting), |
aba76fdb | 3101 | #endif |
f133ecca CM |
3102 | #ifdef CONFIG_HARDWALL |
3103 | INF("hardwall", S_IRUGO, proc_pid_hardwall), | |
3104 | #endif | |
22d917d8 EB |
3105 | #ifdef CONFIG_USER_NS |
3106 | REG("uid_map", S_IRUGO|S_IWUSR, proc_uid_map_operations), | |
3107 | REG("gid_map", S_IRUGO|S_IWUSR, proc_gid_map_operations), | |
3108 | #endif | |
28a6d671 | 3109 | }; |
1da177e4 | 3110 | |
28a6d671 | 3111 | static int proc_tgid_base_readdir(struct file * filp, |
1da177e4 LT |
3112 | void * dirent, filldir_t filldir) |
3113 | { | |
3114 | return proc_pident_readdir(filp,dirent,filldir, | |
28a6d671 | 3115 | tgid_base_stuff,ARRAY_SIZE(tgid_base_stuff)); |
1da177e4 LT |
3116 | } |
3117 | ||
00977a59 | 3118 | static const struct file_operations proc_tgid_base_operations = { |
1da177e4 | 3119 | .read = generic_read_dir, |
28a6d671 | 3120 | .readdir = proc_tgid_base_readdir, |
6038f373 | 3121 | .llseek = default_llseek, |
1da177e4 LT |
3122 | }; |
3123 | ||
00cd8dd3 AV |
3124 | static struct dentry *proc_tgid_base_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags) |
3125 | { | |
7bcd6b0e EB |
3126 | return proc_pident_lookup(dir, dentry, |
3127 | tgid_base_stuff, ARRAY_SIZE(tgid_base_stuff)); | |
1da177e4 LT |
3128 | } |
3129 | ||
c5ef1c42 | 3130 | static const struct inode_operations proc_tgid_base_inode_operations = { |
28a6d671 | 3131 | .lookup = proc_tgid_base_lookup, |
99f89551 | 3132 | .getattr = pid_getattr, |
6d76fa58 | 3133 | .setattr = proc_setattr, |
0499680a | 3134 | .permission = proc_pid_permission, |
1da177e4 | 3135 | }; |
1da177e4 | 3136 | |
60347f67 | 3137 | static void proc_flush_task_mnt(struct vfsmount *mnt, pid_t pid, pid_t tgid) |
1da177e4 | 3138 | { |
48e6484d | 3139 | struct dentry *dentry, *leader, *dir; |
8578cea7 | 3140 | char buf[PROC_NUMBUF]; |
48e6484d EB |
3141 | struct qstr name; |
3142 | ||
3143 | name.name = buf; | |
60347f67 PE |
3144 | name.len = snprintf(buf, sizeof(buf), "%d", pid); |
3145 | dentry = d_hash_and_lookup(mnt->mnt_root, &name); | |
48e6484d | 3146 | if (dentry) { |
29f12ca3 | 3147 | shrink_dcache_parent(dentry); |
48e6484d EB |
3148 | d_drop(dentry); |
3149 | dput(dentry); | |
3150 | } | |
1da177e4 | 3151 | |
48e6484d | 3152 | name.name = buf; |
60347f67 PE |
3153 | name.len = snprintf(buf, sizeof(buf), "%d", tgid); |
3154 | leader = d_hash_and_lookup(mnt->mnt_root, &name); | |
48e6484d EB |
3155 | if (!leader) |
3156 | goto out; | |
1da177e4 | 3157 | |
48e6484d EB |
3158 | name.name = "task"; |
3159 | name.len = strlen(name.name); | |
3160 | dir = d_hash_and_lookup(leader, &name); | |
3161 | if (!dir) | |
3162 | goto out_put_leader; | |
3163 | ||
3164 | name.name = buf; | |
60347f67 | 3165 | name.len = snprintf(buf, sizeof(buf), "%d", pid); |
48e6484d EB |
3166 | dentry = d_hash_and_lookup(dir, &name); |
3167 | if (dentry) { | |
3168 | shrink_dcache_parent(dentry); | |
3169 | d_drop(dentry); | |
3170 | dput(dentry); | |
1da177e4 | 3171 | } |
48e6484d EB |
3172 | |
3173 | dput(dir); | |
3174 | out_put_leader: | |
3175 | dput(leader); | |
3176 | out: | |
3177 | return; | |
1da177e4 LT |
3178 | } |
3179 | ||
0895e91d RD |
3180 | /** |
3181 | * proc_flush_task - Remove dcache entries for @task from the /proc dcache. | |
3182 | * @task: task that should be flushed. | |
3183 | * | |
3184 | * When flushing dentries from proc, one needs to flush them from global | |
60347f67 | 3185 | * proc (proc_mnt) and from all the namespaces' procs this task was seen |
0895e91d RD |
3186 | * in. This call is supposed to do all of this job. |
3187 | * | |
3188 | * Looks in the dcache for | |
3189 | * /proc/@pid | |
3190 | * /proc/@tgid/task/@pid | |
3191 | * if either directory is present flushes it and all of it'ts children | |
3192 | * from the dcache. | |
3193 | * | |
3194 | * It is safe and reasonable to cache /proc entries for a task until | |
3195 | * that task exits. After that they just clog up the dcache with | |
3196 | * useless entries, possibly causing useful dcache entries to be | |
3197 | * flushed instead. This routine is proved to flush those useless | |
3198 | * dcache entries at process exit time. | |
3199 | * | |
3200 | * NOTE: This routine is just an optimization so it does not guarantee | |
3201 | * that no dcache entries will exist at process exit time it | |
3202 | * just makes it very unlikely that any will persist. | |
60347f67 PE |
3203 | */ |
3204 | ||
3205 | void proc_flush_task(struct task_struct *task) | |
3206 | { | |
9fcc2d15 | 3207 | int i; |
9b4d1cbe | 3208 | struct pid *pid, *tgid; |
130f77ec PE |
3209 | struct upid *upid; |
3210 | ||
130f77ec | 3211 | pid = task_pid(task); |
9b4d1cbe | 3212 | tgid = task_tgid(task); |
130f77ec | 3213 | |
9fcc2d15 | 3214 | for (i = 0; i <= pid->level; i++) { |
130f77ec PE |
3215 | upid = &pid->numbers[i]; |
3216 | proc_flush_task_mnt(upid->ns->proc_mnt, upid->nr, | |
9b4d1cbe | 3217 | tgid->numbers[i].nr); |
130f77ec | 3218 | } |
6f4e6433 PE |
3219 | |
3220 | upid = &pid->numbers[pid->level]; | |
3221 | if (upid->nr == 1) | |
3222 | pid_ns_release_proc(upid->ns); | |
60347f67 PE |
3223 | } |
3224 | ||
9711ef99 AB |
3225 | static struct dentry *proc_pid_instantiate(struct inode *dir, |
3226 | struct dentry * dentry, | |
c5141e6d | 3227 | struct task_struct *task, const void *ptr) |
444ceed8 EB |
3228 | { |
3229 | struct dentry *error = ERR_PTR(-ENOENT); | |
3230 | struct inode *inode; | |
3231 | ||
61a28784 | 3232 | inode = proc_pid_make_inode(dir->i_sb, task); |
444ceed8 EB |
3233 | if (!inode) |
3234 | goto out; | |
3235 | ||
3236 | inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO; | |
3237 | inode->i_op = &proc_tgid_base_inode_operations; | |
3238 | inode->i_fop = &proc_tgid_base_operations; | |
3239 | inode->i_flags|=S_IMMUTABLE; | |
aed54175 | 3240 | |
bfe86848 MS |
3241 | set_nlink(inode, 2 + pid_entry_count_dirs(tgid_base_stuff, |
3242 | ARRAY_SIZE(tgid_base_stuff))); | |
444ceed8 | 3243 | |
fb045adb | 3244 | d_set_d_op(dentry, &pid_dentry_operations); |
444ceed8 EB |
3245 | |
3246 | d_add(dentry, inode); | |
3247 | /* Close the race of the process dying before we return the dentry */ | |
0b728e19 | 3248 | if (pid_revalidate(dentry, 0)) |
444ceed8 EB |
3249 | error = NULL; |
3250 | out: | |
3251 | return error; | |
3252 | } | |
3253 | ||
00cd8dd3 | 3254 | struct dentry *proc_pid_lookup(struct inode *dir, struct dentry * dentry, unsigned int flags) |
1da177e4 | 3255 | { |
73d36460 | 3256 | struct dentry *result; |
1da177e4 | 3257 | struct task_struct *task; |
1da177e4 | 3258 | unsigned tgid; |
b488893a | 3259 | struct pid_namespace *ns; |
1da177e4 | 3260 | |
801199ce EB |
3261 | result = proc_base_lookup(dir, dentry); |
3262 | if (!IS_ERR(result) || PTR_ERR(result) != -ENOENT) | |
3263 | goto out; | |
3264 | ||
1da177e4 LT |
3265 | tgid = name_to_int(dentry); |
3266 | if (tgid == ~0U) | |
3267 | goto out; | |
3268 | ||
b488893a | 3269 | ns = dentry->d_sb->s_fs_info; |
de758734 | 3270 | rcu_read_lock(); |
b488893a | 3271 | task = find_task_by_pid_ns(tgid, ns); |
1da177e4 LT |
3272 | if (task) |
3273 | get_task_struct(task); | |
de758734 | 3274 | rcu_read_unlock(); |
1da177e4 LT |
3275 | if (!task) |
3276 | goto out; | |
3277 | ||
444ceed8 | 3278 | result = proc_pid_instantiate(dir, dentry, task, NULL); |
1da177e4 | 3279 | put_task_struct(task); |
1da177e4 | 3280 | out: |
cd6a3ce9 | 3281 | return result; |
1da177e4 LT |
3282 | } |
3283 | ||
1da177e4 | 3284 | /* |
0804ef4b | 3285 | * Find the first task with tgid >= tgid |
0bc58a91 | 3286 | * |
1da177e4 | 3287 | */ |
19fd4bb2 EB |
3288 | struct tgid_iter { |
3289 | unsigned int tgid; | |
0804ef4b | 3290 | struct task_struct *task; |
19fd4bb2 EB |
3291 | }; |
3292 | static struct tgid_iter next_tgid(struct pid_namespace *ns, struct tgid_iter iter) | |
3293 | { | |
0804ef4b | 3294 | struct pid *pid; |
1da177e4 | 3295 | |
19fd4bb2 EB |
3296 | if (iter.task) |
3297 | put_task_struct(iter.task); | |
454cc105 | 3298 | rcu_read_lock(); |
0804ef4b | 3299 | retry: |
19fd4bb2 EB |
3300 | iter.task = NULL; |
3301 | pid = find_ge_pid(iter.tgid, ns); | |
0804ef4b | 3302 | if (pid) { |
19fd4bb2 EB |
3303 | iter.tgid = pid_nr_ns(pid, ns); |
3304 | iter.task = pid_task(pid, PIDTYPE_PID); | |
0804ef4b EB |
3305 | /* What we to know is if the pid we have find is the |
3306 | * pid of a thread_group_leader. Testing for task | |
3307 | * being a thread_group_leader is the obvious thing | |
3308 | * todo but there is a window when it fails, due to | |
3309 | * the pid transfer logic in de_thread. | |
3310 | * | |
3311 | * So we perform the straight forward test of seeing | |
3312 | * if the pid we have found is the pid of a thread | |
3313 | * group leader, and don't worry if the task we have | |
3314 | * found doesn't happen to be a thread group leader. | |
3315 | * As we don't care in the case of readdir. | |
3316 | */ | |
19fd4bb2 EB |
3317 | if (!iter.task || !has_group_leader_pid(iter.task)) { |
3318 | iter.tgid += 1; | |
0804ef4b | 3319 | goto retry; |
19fd4bb2 EB |
3320 | } |
3321 | get_task_struct(iter.task); | |
0bc58a91 | 3322 | } |
454cc105 | 3323 | rcu_read_unlock(); |
19fd4bb2 | 3324 | return iter; |
1da177e4 LT |
3325 | } |
3326 | ||
7bcd6b0e | 3327 | #define TGID_OFFSET (FIRST_PROCESS_ENTRY + ARRAY_SIZE(proc_base_stuff)) |
0804ef4b | 3328 | |
61a28784 | 3329 | static int proc_pid_fill_cache(struct file *filp, void *dirent, filldir_t filldir, |
19fd4bb2 | 3330 | struct tgid_iter iter) |
61a28784 EB |
3331 | { |
3332 | char name[PROC_NUMBUF]; | |
19fd4bb2 | 3333 | int len = snprintf(name, sizeof(name), "%d", iter.tgid); |
61a28784 | 3334 | return proc_fill_cache(filp, dirent, filldir, name, len, |
19fd4bb2 | 3335 | proc_pid_instantiate, iter.task, NULL); |
61a28784 EB |
3336 | } |
3337 | ||
0499680a VK |
3338 | static int fake_filldir(void *buf, const char *name, int namelen, |
3339 | loff_t offset, u64 ino, unsigned d_type) | |
3340 | { | |
3341 | return 0; | |
3342 | } | |
3343 | ||
1da177e4 LT |
3344 | /* for the /proc/ directory itself, after non-process stuff has been done */ |
3345 | int proc_pid_readdir(struct file * filp, void * dirent, filldir_t filldir) | |
3346 | { | |
d8bdc59f LT |
3347 | unsigned int nr; |
3348 | struct task_struct *reaper; | |
19fd4bb2 | 3349 | struct tgid_iter iter; |
b488893a | 3350 | struct pid_namespace *ns; |
0499680a | 3351 | filldir_t __filldir; |
1da177e4 | 3352 | |
d8bdc59f LT |
3353 | if (filp->f_pos >= PID_MAX_LIMIT + TGID_OFFSET) |
3354 | goto out_no_task; | |
3355 | nr = filp->f_pos - FIRST_PROCESS_ENTRY; | |
3356 | ||
3357 | reaper = get_proc_task(filp->f_path.dentry->d_inode); | |
61a28784 EB |
3358 | if (!reaper) |
3359 | goto out_no_task; | |
3360 | ||
7bcd6b0e | 3361 | for (; nr < ARRAY_SIZE(proc_base_stuff); filp->f_pos++, nr++) { |
c5141e6d | 3362 | const struct pid_entry *p = &proc_base_stuff[nr]; |
61a28784 | 3363 | if (proc_base_fill_cache(filp, dirent, filldir, reaper, p) < 0) |
801199ce | 3364 | goto out; |
1da177e4 LT |
3365 | } |
3366 | ||
b488893a | 3367 | ns = filp->f_dentry->d_sb->s_fs_info; |
19fd4bb2 EB |
3368 | iter.task = NULL; |
3369 | iter.tgid = filp->f_pos - TGID_OFFSET; | |
3370 | for (iter = next_tgid(ns, iter); | |
3371 | iter.task; | |
3372 | iter.tgid += 1, iter = next_tgid(ns, iter)) { | |
0499680a VK |
3373 | if (has_pid_permissions(ns, iter.task, 2)) |
3374 | __filldir = filldir; | |
3375 | else | |
3376 | __filldir = fake_filldir; | |
3377 | ||
19fd4bb2 | 3378 | filp->f_pos = iter.tgid + TGID_OFFSET; |
0499680a | 3379 | if (proc_pid_fill_cache(filp, dirent, __filldir, iter) < 0) { |
19fd4bb2 | 3380 | put_task_struct(iter.task); |
0804ef4b | 3381 | goto out; |
1da177e4 | 3382 | } |
0bc58a91 | 3383 | } |
0804ef4b EB |
3384 | filp->f_pos = PID_MAX_LIMIT + TGID_OFFSET; |
3385 | out: | |
61a28784 EB |
3386 | put_task_struct(reaper); |
3387 | out_no_task: | |
0bc58a91 EB |
3388 | return 0; |
3389 | } | |
1da177e4 | 3390 | |
28a6d671 EB |
3391 | /* |
3392 | * Tasks | |
3393 | */ | |
c5141e6d | 3394 | static const struct pid_entry tid_base_stuff[] = { |
631f9c18 | 3395 | DIR("fd", S_IRUSR|S_IXUSR, proc_fd_inode_operations, proc_fd_operations), |
3835541d | 3396 | DIR("fdinfo", S_IRUSR|S_IXUSR, proc_fdinfo_inode_operations, proc_fdinfo_operations), |
6b4e306a | 3397 | DIR("ns", S_IRUSR|S_IXUGO, proc_ns_dir_inode_operations, proc_ns_dir_operations), |
631f9c18 AD |
3398 | REG("environ", S_IRUSR, proc_environ_operations), |
3399 | INF("auxv", S_IRUSR, proc_pid_auxv), | |
3400 | ONE("status", S_IRUGO, proc_pid_status), | |
a9712bc1 | 3401 | ONE("personality", S_IRUGO, proc_pid_personality), |
3036e7b4 | 3402 | INF("limits", S_IRUGO, proc_pid_limits), |
43ae34cb | 3403 | #ifdef CONFIG_SCHED_DEBUG |
631f9c18 | 3404 | REG("sched", S_IRUGO|S_IWUSR, proc_pid_sched_operations), |
ebcb6734 | 3405 | #endif |
4614a696 | 3406 | REG("comm", S_IRUGO|S_IWUSR, proc_pid_set_comm_operations), |
ebcb6734 | 3407 | #ifdef CONFIG_HAVE_ARCH_TRACEHOOK |
a9712bc1 | 3408 | INF("syscall", S_IRUGO, proc_pid_syscall), |
43ae34cb | 3409 | #endif |
631f9c18 AD |
3410 | INF("cmdline", S_IRUGO, proc_pid_cmdline), |
3411 | ONE("stat", S_IRUGO, proc_tid_stat), | |
3412 | ONE("statm", S_IRUGO, proc_pid_statm), | |
b7643757 | 3413 | REG("maps", S_IRUGO, proc_tid_maps_operations), |
81841161 CG |
3414 | #ifdef CONFIG_CHECKPOINT_RESTORE |
3415 | REG("children", S_IRUGO, proc_tid_children_operations), | |
3416 | #endif | |
28a6d671 | 3417 | #ifdef CONFIG_NUMA |
b7643757 | 3418 | REG("numa_maps", S_IRUGO, proc_tid_numa_maps_operations), |
28a6d671 | 3419 | #endif |
631f9c18 AD |
3420 | REG("mem", S_IRUSR|S_IWUSR, proc_mem_operations), |
3421 | LNK("cwd", proc_cwd_link), | |
3422 | LNK("root", proc_root_link), | |
3423 | LNK("exe", proc_exe_link), | |
3424 | REG("mounts", S_IRUGO, proc_mounts_operations), | |
3425 | REG("mountinfo", S_IRUGO, proc_mountinfo_operations), | |
1e883281 | 3426 | #ifdef CONFIG_PROC_PAGE_MONITOR |
631f9c18 | 3427 | REG("clear_refs", S_IWUSR, proc_clear_refs_operations), |
b7643757 | 3428 | REG("smaps", S_IRUGO, proc_tid_smaps_operations), |
ca6b0bf0 | 3429 | REG("pagemap", S_IRUGO, proc_pagemap_operations), |
28a6d671 EB |
3430 | #endif |
3431 | #ifdef CONFIG_SECURITY | |
631f9c18 | 3432 | DIR("attr", S_IRUGO|S_IXUGO, proc_attr_dir_inode_operations, proc_attr_dir_operations), |
28a6d671 EB |
3433 | #endif |
3434 | #ifdef CONFIG_KALLSYMS | |
631f9c18 | 3435 | INF("wchan", S_IRUGO, proc_pid_wchan), |
28a6d671 | 3436 | #endif |
2ec220e2 | 3437 | #ifdef CONFIG_STACKTRACE |
a9712bc1 | 3438 | ONE("stack", S_IRUGO, proc_pid_stack), |
28a6d671 EB |
3439 | #endif |
3440 | #ifdef CONFIG_SCHEDSTATS | |
631f9c18 | 3441 | INF("schedstat", S_IRUGO, proc_pid_schedstat), |
28a6d671 | 3442 | #endif |
9745512c | 3443 | #ifdef CONFIG_LATENCYTOP |
631f9c18 | 3444 | REG("latency", S_IRUGO, proc_lstats_operations), |
9745512c | 3445 | #endif |
8793d854 | 3446 | #ifdef CONFIG_PROC_PID_CPUSET |
631f9c18 | 3447 | REG("cpuset", S_IRUGO, proc_cpuset_operations), |
a424316c PM |
3448 | #endif |
3449 | #ifdef CONFIG_CGROUPS | |
631f9c18 | 3450 | REG("cgroup", S_IRUGO, proc_cgroup_operations), |
28a6d671 | 3451 | #endif |
631f9c18 AD |
3452 | INF("oom_score", S_IRUGO, proc_oom_score), |
3453 | REG("oom_adj", S_IRUGO|S_IWUSR, proc_oom_adjust_operations), | |
a63d83f4 | 3454 | REG("oom_score_adj", S_IRUGO|S_IWUSR, proc_oom_score_adj_operations), |
28a6d671 | 3455 | #ifdef CONFIG_AUDITSYSCALL |
631f9c18 | 3456 | REG("loginuid", S_IWUSR|S_IRUGO, proc_loginuid_operations), |
26ec3c64 | 3457 | REG("sessionid", S_IRUGO, proc_sessionid_operations), |
28a6d671 | 3458 | #endif |
f4f154fd | 3459 | #ifdef CONFIG_FAULT_INJECTION |
631f9c18 | 3460 | REG("make-it-fail", S_IRUGO|S_IWUSR, proc_fault_inject_operations), |
f4f154fd | 3461 | #endif |
297c5d92 | 3462 | #ifdef CONFIG_TASK_IO_ACCOUNTING |
1d1221f3 | 3463 | INF("io", S_IRUSR, proc_tid_io_accounting), |
297c5d92 | 3464 | #endif |
f133ecca CM |
3465 | #ifdef CONFIG_HARDWALL |
3466 | INF("hardwall", S_IRUGO, proc_pid_hardwall), | |
3467 | #endif | |
22d917d8 EB |
3468 | #ifdef CONFIG_USER_NS |
3469 | REG("uid_map", S_IRUGO|S_IWUSR, proc_uid_map_operations), | |
3470 | REG("gid_map", S_IRUGO|S_IWUSR, proc_gid_map_operations), | |
3471 | #endif | |
28a6d671 EB |
3472 | }; |
3473 | ||
3474 | static int proc_tid_base_readdir(struct file * filp, | |
3475 | void * dirent, filldir_t filldir) | |
3476 | { | |
3477 | return proc_pident_readdir(filp,dirent,filldir, | |
3478 | tid_base_stuff,ARRAY_SIZE(tid_base_stuff)); | |
3479 | } | |
3480 | ||
00cd8dd3 AV |
3481 | static struct dentry *proc_tid_base_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags) |
3482 | { | |
7bcd6b0e EB |
3483 | return proc_pident_lookup(dir, dentry, |
3484 | tid_base_stuff, ARRAY_SIZE(tid_base_stuff)); | |
28a6d671 EB |
3485 | } |
3486 | ||
00977a59 | 3487 | static const struct file_operations proc_tid_base_operations = { |
28a6d671 EB |
3488 | .read = generic_read_dir, |
3489 | .readdir = proc_tid_base_readdir, | |
6038f373 | 3490 | .llseek = default_llseek, |
28a6d671 EB |
3491 | }; |
3492 | ||
c5ef1c42 | 3493 | static const struct inode_operations proc_tid_base_inode_operations = { |
28a6d671 EB |
3494 | .lookup = proc_tid_base_lookup, |
3495 | .getattr = pid_getattr, | |
3496 | .setattr = proc_setattr, | |
3497 | }; | |
3498 | ||
444ceed8 | 3499 | static struct dentry *proc_task_instantiate(struct inode *dir, |
c5141e6d | 3500 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
444ceed8 EB |
3501 | { |
3502 | struct dentry *error = ERR_PTR(-ENOENT); | |
3503 | struct inode *inode; | |
61a28784 | 3504 | inode = proc_pid_make_inode(dir->i_sb, task); |
444ceed8 EB |
3505 | |
3506 | if (!inode) | |
3507 | goto out; | |
3508 | inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO; | |
3509 | inode->i_op = &proc_tid_base_inode_operations; | |
3510 | inode->i_fop = &proc_tid_base_operations; | |
3511 | inode->i_flags|=S_IMMUTABLE; | |
aed54175 | 3512 | |
bfe86848 MS |
3513 | set_nlink(inode, 2 + pid_entry_count_dirs(tid_base_stuff, |
3514 | ARRAY_SIZE(tid_base_stuff))); | |
444ceed8 | 3515 | |
fb045adb | 3516 | d_set_d_op(dentry, &pid_dentry_operations); |
444ceed8 EB |
3517 | |
3518 | d_add(dentry, inode); | |
3519 | /* Close the race of the process dying before we return the dentry */ | |
0b728e19 | 3520 | if (pid_revalidate(dentry, 0)) |
444ceed8 EB |
3521 | error = NULL; |
3522 | out: | |
3523 | return error; | |
3524 | } | |
3525 | ||
00cd8dd3 | 3526 | static struct dentry *proc_task_lookup(struct inode *dir, struct dentry * dentry, unsigned int flags) |
28a6d671 EB |
3527 | { |
3528 | struct dentry *result = ERR_PTR(-ENOENT); | |
3529 | struct task_struct *task; | |
3530 | struct task_struct *leader = get_proc_task(dir); | |
28a6d671 | 3531 | unsigned tid; |
b488893a | 3532 | struct pid_namespace *ns; |
28a6d671 EB |
3533 | |
3534 | if (!leader) | |
3535 | goto out_no_task; | |
3536 | ||
3537 | tid = name_to_int(dentry); | |
3538 | if (tid == ~0U) | |
3539 | goto out; | |
3540 | ||
b488893a | 3541 | ns = dentry->d_sb->s_fs_info; |
28a6d671 | 3542 | rcu_read_lock(); |
b488893a | 3543 | task = find_task_by_pid_ns(tid, ns); |
28a6d671 EB |
3544 | if (task) |
3545 | get_task_struct(task); | |
3546 | rcu_read_unlock(); | |
3547 | if (!task) | |
3548 | goto out; | |
bac0abd6 | 3549 | if (!same_thread_group(leader, task)) |
28a6d671 EB |
3550 | goto out_drop_task; |
3551 | ||
444ceed8 | 3552 | result = proc_task_instantiate(dir, dentry, task, NULL); |
28a6d671 EB |
3553 | out_drop_task: |
3554 | put_task_struct(task); | |
3555 | out: | |
3556 | put_task_struct(leader); | |
3557 | out_no_task: | |
3558 | return result; | |
3559 | } | |
3560 | ||
0bc58a91 EB |
3561 | /* |
3562 | * Find the first tid of a thread group to return to user space. | |
3563 | * | |
3564 | * Usually this is just the thread group leader, but if the users | |
3565 | * buffer was too small or there was a seek into the middle of the | |
3566 | * directory we have more work todo. | |
3567 | * | |
3568 | * In the case of a short read we start with find_task_by_pid. | |
3569 | * | |
3570 | * In the case of a seek we start with the leader and walk nr | |
3571 | * threads past it. | |
3572 | */ | |
cc288738 | 3573 | static struct task_struct *first_tid(struct task_struct *leader, |
b488893a | 3574 | int tid, int nr, struct pid_namespace *ns) |
0bc58a91 | 3575 | { |
a872ff0c | 3576 | struct task_struct *pos; |
1da177e4 | 3577 | |
cc288738 | 3578 | rcu_read_lock(); |
0bc58a91 EB |
3579 | /* Attempt to start with the pid of a thread */ |
3580 | if (tid && (nr > 0)) { | |
b488893a | 3581 | pos = find_task_by_pid_ns(tid, ns); |
a872ff0c ON |
3582 | if (pos && (pos->group_leader == leader)) |
3583 | goto found; | |
0bc58a91 | 3584 | } |
1da177e4 | 3585 | |
0bc58a91 | 3586 | /* If nr exceeds the number of threads there is nothing todo */ |
a872ff0c ON |
3587 | pos = NULL; |
3588 | if (nr && nr >= get_nr_threads(leader)) | |
3589 | goto out; | |
1da177e4 | 3590 | |
a872ff0c ON |
3591 | /* If we haven't found our starting place yet start |
3592 | * with the leader and walk nr threads forward. | |
0bc58a91 | 3593 | */ |
a872ff0c ON |
3594 | for (pos = leader; nr > 0; --nr) { |
3595 | pos = next_thread(pos); | |
3596 | if (pos == leader) { | |
3597 | pos = NULL; | |
3598 | goto out; | |
3599 | } | |
1da177e4 | 3600 | } |
a872ff0c ON |
3601 | found: |
3602 | get_task_struct(pos); | |
3603 | out: | |
cc288738 | 3604 | rcu_read_unlock(); |
0bc58a91 EB |
3605 | return pos; |
3606 | } | |
3607 | ||
3608 | /* | |
3609 | * Find the next thread in the thread list. | |
3610 | * Return NULL if there is an error or no next thread. | |
3611 | * | |
3612 | * The reference to the input task_struct is released. | |
3613 | */ | |
3614 | static struct task_struct *next_tid(struct task_struct *start) | |
3615 | { | |
c1df7fb8 | 3616 | struct task_struct *pos = NULL; |
cc288738 | 3617 | rcu_read_lock(); |
c1df7fb8 | 3618 | if (pid_alive(start)) { |
0bc58a91 | 3619 | pos = next_thread(start); |
c1df7fb8 ON |
3620 | if (thread_group_leader(pos)) |
3621 | pos = NULL; | |
3622 | else | |
3623 | get_task_struct(pos); | |
3624 | } | |
cc288738 | 3625 | rcu_read_unlock(); |
0bc58a91 EB |
3626 | put_task_struct(start); |
3627 | return pos; | |
1da177e4 LT |
3628 | } |
3629 | ||
61a28784 EB |
3630 | static int proc_task_fill_cache(struct file *filp, void *dirent, filldir_t filldir, |
3631 | struct task_struct *task, int tid) | |
3632 | { | |
3633 | char name[PROC_NUMBUF]; | |
3634 | int len = snprintf(name, sizeof(name), "%d", tid); | |
3635 | return proc_fill_cache(filp, dirent, filldir, name, len, | |
3636 | proc_task_instantiate, task, NULL); | |
3637 | } | |
3638 | ||
1da177e4 LT |
3639 | /* for the /proc/TGID/task/ directories */ |
3640 | static int proc_task_readdir(struct file * filp, void * dirent, filldir_t filldir) | |
3641 | { | |
2fddfeef | 3642 | struct dentry *dentry = filp->f_path.dentry; |
1da177e4 | 3643 | struct inode *inode = dentry->d_inode; |
7d895244 | 3644 | struct task_struct *leader = NULL; |
0bc58a91 | 3645 | struct task_struct *task; |
1da177e4 LT |
3646 | int retval = -ENOENT; |
3647 | ino_t ino; | |
0bc58a91 | 3648 | int tid; |
b488893a | 3649 | struct pid_namespace *ns; |
1da177e4 | 3650 | |
7d895244 GC |
3651 | task = get_proc_task(inode); |
3652 | if (!task) | |
3653 | goto out_no_task; | |
3654 | rcu_read_lock(); | |
3655 | if (pid_alive(task)) { | |
3656 | leader = task->group_leader; | |
3657 | get_task_struct(leader); | |
3658 | } | |
3659 | rcu_read_unlock(); | |
3660 | put_task_struct(task); | |
99f89551 EB |
3661 | if (!leader) |
3662 | goto out_no_task; | |
1da177e4 LT |
3663 | retval = 0; |
3664 | ||
ee568b25 | 3665 | switch ((unsigned long)filp->f_pos) { |
1da177e4 LT |
3666 | case 0: |
3667 | ino = inode->i_ino; | |
ee6f779b | 3668 | if (filldir(dirent, ".", 1, filp->f_pos, ino, DT_DIR) < 0) |
1da177e4 | 3669 | goto out; |
ee6f779b | 3670 | filp->f_pos++; |
1da177e4 LT |
3671 | /* fall through */ |
3672 | case 1: | |
3673 | ino = parent_ino(dentry); | |
ee6f779b | 3674 | if (filldir(dirent, "..", 2, filp->f_pos, ino, DT_DIR) < 0) |
1da177e4 | 3675 | goto out; |
ee6f779b | 3676 | filp->f_pos++; |
1da177e4 LT |
3677 | /* fall through */ |
3678 | } | |
3679 | ||
0bc58a91 EB |
3680 | /* f_version caches the tgid value that the last readdir call couldn't |
3681 | * return. lseek aka telldir automagically resets f_version to 0. | |
3682 | */ | |
b488893a | 3683 | ns = filp->f_dentry->d_sb->s_fs_info; |
2b47c361 | 3684 | tid = (int)filp->f_version; |
0bc58a91 | 3685 | filp->f_version = 0; |
ee6f779b | 3686 | for (task = first_tid(leader, tid, filp->f_pos - 2, ns); |
0bc58a91 | 3687 | task; |
ee6f779b | 3688 | task = next_tid(task), filp->f_pos++) { |
b488893a | 3689 | tid = task_pid_nr_ns(task, ns); |
61a28784 | 3690 | if (proc_task_fill_cache(filp, dirent, filldir, task, tid) < 0) { |
0bc58a91 EB |
3691 | /* returning this tgid failed, save it as the first |
3692 | * pid for the next readir call */ | |
2b47c361 | 3693 | filp->f_version = (u64)tid; |
0bc58a91 | 3694 | put_task_struct(task); |
1da177e4 | 3695 | break; |
0bc58a91 | 3696 | } |
1da177e4 LT |
3697 | } |
3698 | out: | |
99f89551 EB |
3699 | put_task_struct(leader); |
3700 | out_no_task: | |
1da177e4 LT |
3701 | return retval; |
3702 | } | |
6e66b52b EB |
3703 | |
3704 | static int proc_task_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) | |
3705 | { | |
3706 | struct inode *inode = dentry->d_inode; | |
99f89551 | 3707 | struct task_struct *p = get_proc_task(inode); |
6e66b52b EB |
3708 | generic_fillattr(inode, stat); |
3709 | ||
99f89551 | 3710 | if (p) { |
99f89551 | 3711 | stat->nlink += get_nr_threads(p); |
99f89551 | 3712 | put_task_struct(p); |
6e66b52b EB |
3713 | } |
3714 | ||
3715 | return 0; | |
3716 | } | |
28a6d671 | 3717 | |
c5ef1c42 | 3718 | static const struct inode_operations proc_task_inode_operations = { |
28a6d671 EB |
3719 | .lookup = proc_task_lookup, |
3720 | .getattr = proc_task_getattr, | |
3721 | .setattr = proc_setattr, | |
0499680a | 3722 | .permission = proc_pid_permission, |
28a6d671 EB |
3723 | }; |
3724 | ||
00977a59 | 3725 | static const struct file_operations proc_task_operations = { |
28a6d671 EB |
3726 | .read = generic_read_dir, |
3727 | .readdir = proc_task_readdir, | |
6038f373 | 3728 | .llseek = default_llseek, |
28a6d671 | 3729 | }; |