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1da177e4 LT |
1 | /* |
2 | * linux/fs/proc/base.c | |
3 | * | |
4 | * Copyright (C) 1991, 1992 Linus Torvalds | |
5 | * | |
6 | * proc base directory handling functions | |
7 | * | |
8 | * 1999, Al Viro. Rewritten. Now it covers the whole per-process part. | |
9 | * Instead of using magical inumbers to determine the kind of object | |
10 | * we allocate and fill in-core inodes upon lookup. They don't even | |
11 | * go into icache. We cache the reference to task_struct upon lookup too. | |
12 | * Eventually it should become a filesystem in its own. We don't use the | |
13 | * rest of procfs anymore. | |
e070ad49 ML |
14 | * |
15 | * | |
16 | * Changelog: | |
17 | * 17-Jan-2005 | |
18 | * Allan Bezerra | |
19 | * Bruna Moreira <bruna.moreira@indt.org.br> | |
20 | * Edjard Mota <edjard.mota@indt.org.br> | |
21 | * Ilias Biris <ilias.biris@indt.org.br> | |
22 | * Mauricio Lin <mauricio.lin@indt.org.br> | |
23 | * | |
24 | * Embedded Linux Lab - 10LE Instituto Nokia de Tecnologia - INdT | |
25 | * | |
26 | * A new process specific entry (smaps) included in /proc. It shows the | |
27 | * size of rss for each memory area. The maps entry lacks information | |
28 | * about physical memory size (rss) for each mapped file, i.e., | |
29 | * rss information for executables and library files. | |
30 | * This additional information is useful for any tools that need to know | |
31 | * about physical memory consumption for a process specific library. | |
32 | * | |
33 | * Changelog: | |
34 | * 21-Feb-2005 | |
35 | * Embedded Linux Lab - 10LE Instituto Nokia de Tecnologia - INdT | |
36 | * Pud inclusion in the page table walking. | |
37 | * | |
38 | * ChangeLog: | |
39 | * 10-Mar-2005 | |
40 | * 10LE Instituto Nokia de Tecnologia - INdT: | |
41 | * A better way to walks through the page table as suggested by Hugh Dickins. | |
42 | * | |
43 | * Simo Piiroinen <simo.piiroinen@nokia.com>: | |
44 | * Smaps information related to shared, private, clean and dirty pages. | |
45 | * | |
46 | * Paul Mundt <paul.mundt@nokia.com>: | |
47 | * Overall revision about smaps. | |
1da177e4 LT |
48 | */ |
49 | ||
50 | #include <asm/uaccess.h> | |
51 | ||
1da177e4 LT |
52 | #include <linux/errno.h> |
53 | #include <linux/time.h> | |
54 | #include <linux/proc_fs.h> | |
55 | #include <linux/stat.h> | |
5995477a | 56 | #include <linux/task_io_accounting_ops.h> |
1da177e4 | 57 | #include <linux/init.h> |
16f7e0fe | 58 | #include <linux/capability.h> |
1da177e4 | 59 | #include <linux/file.h> |
9f3acc31 | 60 | #include <linux/fdtable.h> |
1da177e4 LT |
61 | #include <linux/string.h> |
62 | #include <linux/seq_file.h> | |
63 | #include <linux/namei.h> | |
6b3286ed | 64 | #include <linux/mnt_namespace.h> |
1da177e4 | 65 | #include <linux/mm.h> |
a63d83f4 | 66 | #include <linux/swap.h> |
b835996f | 67 | #include <linux/rcupdate.h> |
1da177e4 | 68 | #include <linux/kallsyms.h> |
2ec220e2 | 69 | #include <linux/stacktrace.h> |
d85f50d5 | 70 | #include <linux/resource.h> |
5096add8 | 71 | #include <linux/module.h> |
1da177e4 LT |
72 | #include <linux/mount.h> |
73 | #include <linux/security.h> | |
74 | #include <linux/ptrace.h> | |
0d094efe | 75 | #include <linux/tracehook.h> |
a424316c | 76 | #include <linux/cgroup.h> |
1da177e4 LT |
77 | #include <linux/cpuset.h> |
78 | #include <linux/audit.h> | |
5addc5dd | 79 | #include <linux/poll.h> |
1651e14e | 80 | #include <linux/nsproxy.h> |
8ac773b4 | 81 | #include <linux/oom.h> |
3cb4a0bb | 82 | #include <linux/elf.h> |
60347f67 | 83 | #include <linux/pid_namespace.h> |
5ad4e53b | 84 | #include <linux/fs_struct.h> |
5a0e3ad6 | 85 | #include <linux/slab.h> |
1da177e4 LT |
86 | #include "internal.h" |
87 | ||
0f2fe20f EB |
88 | /* NOTE: |
89 | * Implementing inode permission operations in /proc is almost | |
90 | * certainly an error. Permission checks need to happen during | |
91 | * each system call not at open time. The reason is that most of | |
92 | * what we wish to check for permissions in /proc varies at runtime. | |
93 | * | |
94 | * The classic example of a problem is opening file descriptors | |
95 | * in /proc for a task before it execs a suid executable. | |
96 | */ | |
97 | ||
1da177e4 | 98 | struct pid_entry { |
1da177e4 | 99 | char *name; |
c5141e6d | 100 | int len; |
1da177e4 | 101 | mode_t mode; |
c5ef1c42 | 102 | const struct inode_operations *iop; |
00977a59 | 103 | const struct file_operations *fop; |
20cdc894 | 104 | union proc_op op; |
1da177e4 LT |
105 | }; |
106 | ||
61a28784 | 107 | #define NOD(NAME, MODE, IOP, FOP, OP) { \ |
20cdc894 | 108 | .name = (NAME), \ |
c5141e6d | 109 | .len = sizeof(NAME) - 1, \ |
20cdc894 EB |
110 | .mode = MODE, \ |
111 | .iop = IOP, \ | |
112 | .fop = FOP, \ | |
113 | .op = OP, \ | |
114 | } | |
115 | ||
631f9c18 AD |
116 | #define DIR(NAME, MODE, iops, fops) \ |
117 | NOD(NAME, (S_IFDIR|(MODE)), &iops, &fops, {} ) | |
118 | #define LNK(NAME, get_link) \ | |
61a28784 | 119 | NOD(NAME, (S_IFLNK|S_IRWXUGO), \ |
20cdc894 | 120 | &proc_pid_link_inode_operations, NULL, \ |
631f9c18 AD |
121 | { .proc_get_link = get_link } ) |
122 | #define REG(NAME, MODE, fops) \ | |
123 | NOD(NAME, (S_IFREG|(MODE)), NULL, &fops, {}) | |
124 | #define INF(NAME, MODE, read) \ | |
61a28784 | 125 | NOD(NAME, (S_IFREG|(MODE)), \ |
20cdc894 | 126 | NULL, &proc_info_file_operations, \ |
631f9c18 AD |
127 | { .proc_read = read } ) |
128 | #define ONE(NAME, MODE, show) \ | |
be614086 EB |
129 | NOD(NAME, (S_IFREG|(MODE)), \ |
130 | NULL, &proc_single_file_operations, \ | |
631f9c18 | 131 | { .proc_show = show } ) |
1da177e4 | 132 | |
aed54175 VN |
133 | /* |
134 | * Count the number of hardlinks for the pid_entry table, excluding the . | |
135 | * and .. links. | |
136 | */ | |
137 | static unsigned int pid_entry_count_dirs(const struct pid_entry *entries, | |
138 | unsigned int n) | |
139 | { | |
140 | unsigned int i; | |
141 | unsigned int count; | |
142 | ||
143 | count = 0; | |
144 | for (i = 0; i < n; ++i) { | |
145 | if (S_ISDIR(entries[i].mode)) | |
146 | ++count; | |
147 | } | |
148 | ||
149 | return count; | |
150 | } | |
151 | ||
f7ad3c6b | 152 | static int get_task_root(struct task_struct *task, struct path *root) |
1da177e4 | 153 | { |
7c2c7d99 HD |
154 | int result = -ENOENT; |
155 | ||
0494f6ec | 156 | task_lock(task); |
f7ad3c6b MS |
157 | if (task->fs) { |
158 | get_fs_root(task->fs, root); | |
7c2c7d99 HD |
159 | result = 0; |
160 | } | |
0494f6ec | 161 | task_unlock(task); |
7c2c7d99 | 162 | return result; |
0494f6ec MS |
163 | } |
164 | ||
3dcd25f3 | 165 | static int proc_cwd_link(struct inode *inode, struct path *path) |
0494f6ec | 166 | { |
99f89551 | 167 | struct task_struct *task = get_proc_task(inode); |
0494f6ec | 168 | int result = -ENOENT; |
99f89551 EB |
169 | |
170 | if (task) { | |
f7ad3c6b MS |
171 | task_lock(task); |
172 | if (task->fs) { | |
173 | get_fs_pwd(task->fs, path); | |
174 | result = 0; | |
175 | } | |
176 | task_unlock(task); | |
99f89551 EB |
177 | put_task_struct(task); |
178 | } | |
1da177e4 LT |
179 | return result; |
180 | } | |
181 | ||
3dcd25f3 | 182 | static int proc_root_link(struct inode *inode, struct path *path) |
1da177e4 | 183 | { |
99f89551 | 184 | struct task_struct *task = get_proc_task(inode); |
1da177e4 | 185 | int result = -ENOENT; |
99f89551 EB |
186 | |
187 | if (task) { | |
f7ad3c6b | 188 | result = get_task_root(task, path); |
99f89551 EB |
189 | put_task_struct(task); |
190 | } | |
1da177e4 LT |
191 | return result; |
192 | } | |
193 | ||
638fa202 RM |
194 | /* |
195 | * Return zero if current may access user memory in @task, -error if not. | |
196 | */ | |
197 | static int check_mem_permission(struct task_struct *task) | |
198 | { | |
199 | /* | |
200 | * A task can always look at itself, in case it chooses | |
201 | * to use system calls instead of load instructions. | |
202 | */ | |
203 | if (task == current) | |
204 | return 0; | |
205 | ||
206 | /* | |
207 | * If current is actively ptrace'ing, and would also be | |
208 | * permitted to freshly attach with ptrace now, permit it. | |
209 | */ | |
0d094efe RM |
210 | if (task_is_stopped_or_traced(task)) { |
211 | int match; | |
212 | rcu_read_lock(); | |
213 | match = (tracehook_tracer_task(task) == current); | |
214 | rcu_read_unlock(); | |
215 | if (match && ptrace_may_access(task, PTRACE_MODE_ATTACH)) | |
216 | return 0; | |
217 | } | |
638fa202 RM |
218 | |
219 | /* | |
220 | * Noone else is allowed. | |
221 | */ | |
222 | return -EPERM; | |
223 | } | |
1da177e4 | 224 | |
831830b5 AV |
225 | struct mm_struct *mm_for_maps(struct task_struct *task) |
226 | { | |
704b836c ON |
227 | struct mm_struct *mm; |
228 | ||
229 | if (mutex_lock_killable(&task->cred_guard_mutex)) | |
230 | return NULL; | |
00f89d21 | 231 | |
704b836c ON |
232 | mm = get_task_mm(task); |
233 | if (mm && mm != current->mm && | |
234 | !ptrace_may_access(task, PTRACE_MODE_READ)) { | |
235 | mmput(mm); | |
236 | mm = NULL; | |
13f0feaf | 237 | } |
704b836c ON |
238 | mutex_unlock(&task->cred_guard_mutex); |
239 | ||
831830b5 | 240 | return mm; |
831830b5 AV |
241 | } |
242 | ||
1da177e4 LT |
243 | static int proc_pid_cmdline(struct task_struct *task, char * buffer) |
244 | { | |
245 | int res = 0; | |
246 | unsigned int len; | |
247 | struct mm_struct *mm = get_task_mm(task); | |
248 | if (!mm) | |
249 | goto out; | |
250 | if (!mm->arg_end) | |
251 | goto out_mm; /* Shh! No looking before we're done */ | |
252 | ||
253 | len = mm->arg_end - mm->arg_start; | |
254 | ||
255 | if (len > PAGE_SIZE) | |
256 | len = PAGE_SIZE; | |
257 | ||
258 | res = access_process_vm(task, mm->arg_start, buffer, len, 0); | |
259 | ||
260 | // If the nul at the end of args has been overwritten, then | |
261 | // assume application is using setproctitle(3). | |
262 | if (res > 0 && buffer[res-1] != '\0' && len < PAGE_SIZE) { | |
263 | len = strnlen(buffer, res); | |
264 | if (len < res) { | |
265 | res = len; | |
266 | } else { | |
267 | len = mm->env_end - mm->env_start; | |
268 | if (len > PAGE_SIZE - res) | |
269 | len = PAGE_SIZE - res; | |
270 | res += access_process_vm(task, mm->env_start, buffer+res, len, 0); | |
271 | res = strnlen(buffer, res); | |
272 | } | |
273 | } | |
274 | out_mm: | |
275 | mmput(mm); | |
276 | out: | |
277 | return res; | |
278 | } | |
279 | ||
280 | static int proc_pid_auxv(struct task_struct *task, char *buffer) | |
281 | { | |
282 | int res = 0; | |
283 | struct mm_struct *mm = get_task_mm(task); | |
284 | if (mm) { | |
285 | unsigned int nwords = 0; | |
dfe6b7d9 | 286 | do { |
1da177e4 | 287 | nwords += 2; |
dfe6b7d9 | 288 | } while (mm->saved_auxv[nwords - 2] != 0); /* AT_NULL */ |
1da177e4 LT |
289 | res = nwords * sizeof(mm->saved_auxv[0]); |
290 | if (res > PAGE_SIZE) | |
291 | res = PAGE_SIZE; | |
292 | memcpy(buffer, mm->saved_auxv, res); | |
293 | mmput(mm); | |
294 | } | |
295 | return res; | |
296 | } | |
297 | ||
298 | ||
299 | #ifdef CONFIG_KALLSYMS | |
300 | /* | |
301 | * Provides a wchan file via kallsyms in a proper one-value-per-file format. | |
302 | * Returns the resolved symbol. If that fails, simply return the address. | |
303 | */ | |
304 | static int proc_pid_wchan(struct task_struct *task, char *buffer) | |
305 | { | |
ffb45122 | 306 | unsigned long wchan; |
9281acea | 307 | char symname[KSYM_NAME_LEN]; |
1da177e4 LT |
308 | |
309 | wchan = get_wchan(task); | |
310 | ||
9d65cb4a | 311 | if (lookup_symbol_name(wchan, symname) < 0) |
f83ce3e6 JE |
312 | if (!ptrace_may_access(task, PTRACE_MODE_READ)) |
313 | return 0; | |
314 | else | |
315 | return sprintf(buffer, "%lu", wchan); | |
9d65cb4a AD |
316 | else |
317 | return sprintf(buffer, "%s", symname); | |
1da177e4 LT |
318 | } |
319 | #endif /* CONFIG_KALLSYMS */ | |
320 | ||
2ec220e2 KC |
321 | #ifdef CONFIG_STACKTRACE |
322 | ||
323 | #define MAX_STACK_TRACE_DEPTH 64 | |
324 | ||
325 | static int proc_pid_stack(struct seq_file *m, struct pid_namespace *ns, | |
326 | struct pid *pid, struct task_struct *task) | |
327 | { | |
328 | struct stack_trace trace; | |
329 | unsigned long *entries; | |
330 | int i; | |
331 | ||
332 | entries = kmalloc(MAX_STACK_TRACE_DEPTH * sizeof(*entries), GFP_KERNEL); | |
333 | if (!entries) | |
334 | return -ENOMEM; | |
335 | ||
336 | trace.nr_entries = 0; | |
337 | trace.max_entries = MAX_STACK_TRACE_DEPTH; | |
338 | trace.entries = entries; | |
339 | trace.skip = 0; | |
340 | save_stack_trace_tsk(task, &trace); | |
341 | ||
342 | for (i = 0; i < trace.nr_entries; i++) { | |
343 | seq_printf(m, "[<%p>] %pS\n", | |
344 | (void *)entries[i], (void *)entries[i]); | |
345 | } | |
346 | kfree(entries); | |
347 | ||
348 | return 0; | |
349 | } | |
350 | #endif | |
351 | ||
1da177e4 LT |
352 | #ifdef CONFIG_SCHEDSTATS |
353 | /* | |
354 | * Provides /proc/PID/schedstat | |
355 | */ | |
356 | static int proc_pid_schedstat(struct task_struct *task, char *buffer) | |
357 | { | |
172ba844 | 358 | return sprintf(buffer, "%llu %llu %lu\n", |
826e08b0 IM |
359 | (unsigned long long)task->se.sum_exec_runtime, |
360 | (unsigned long long)task->sched_info.run_delay, | |
2d72376b | 361 | task->sched_info.pcount); |
1da177e4 LT |
362 | } |
363 | #endif | |
364 | ||
9745512c AV |
365 | #ifdef CONFIG_LATENCYTOP |
366 | static int lstats_show_proc(struct seq_file *m, void *v) | |
367 | { | |
368 | int i; | |
13d77c37 HS |
369 | struct inode *inode = m->private; |
370 | struct task_struct *task = get_proc_task(inode); | |
9745512c | 371 | |
13d77c37 HS |
372 | if (!task) |
373 | return -ESRCH; | |
374 | seq_puts(m, "Latency Top version : v0.1\n"); | |
9745512c AV |
375 | for (i = 0; i < 32; i++) { |
376 | if (task->latency_record[i].backtrace[0]) { | |
377 | int q; | |
378 | seq_printf(m, "%i %li %li ", | |
379 | task->latency_record[i].count, | |
380 | task->latency_record[i].time, | |
381 | task->latency_record[i].max); | |
382 | for (q = 0; q < LT_BACKTRACEDEPTH; q++) { | |
9c246247 | 383 | char sym[KSYM_SYMBOL_LEN]; |
9745512c AV |
384 | char *c; |
385 | if (!task->latency_record[i].backtrace[q]) | |
386 | break; | |
387 | if (task->latency_record[i].backtrace[q] == ULONG_MAX) | |
388 | break; | |
389 | sprint_symbol(sym, task->latency_record[i].backtrace[q]); | |
390 | c = strchr(sym, '+'); | |
391 | if (c) | |
392 | *c = 0; | |
393 | seq_printf(m, "%s ", sym); | |
394 | } | |
395 | seq_printf(m, "\n"); | |
396 | } | |
397 | ||
398 | } | |
13d77c37 | 399 | put_task_struct(task); |
9745512c AV |
400 | return 0; |
401 | } | |
402 | ||
403 | static int lstats_open(struct inode *inode, struct file *file) | |
404 | { | |
13d77c37 | 405 | return single_open(file, lstats_show_proc, inode); |
d6643d12 HS |
406 | } |
407 | ||
9745512c AV |
408 | static ssize_t lstats_write(struct file *file, const char __user *buf, |
409 | size_t count, loff_t *offs) | |
410 | { | |
13d77c37 | 411 | struct task_struct *task = get_proc_task(file->f_dentry->d_inode); |
9745512c | 412 | |
13d77c37 HS |
413 | if (!task) |
414 | return -ESRCH; | |
9745512c | 415 | clear_all_latency_tracing(task); |
13d77c37 | 416 | put_task_struct(task); |
9745512c AV |
417 | |
418 | return count; | |
419 | } | |
420 | ||
421 | static const struct file_operations proc_lstats_operations = { | |
422 | .open = lstats_open, | |
423 | .read = seq_read, | |
424 | .write = lstats_write, | |
425 | .llseek = seq_lseek, | |
13d77c37 | 426 | .release = single_release, |
9745512c AV |
427 | }; |
428 | ||
429 | #endif | |
430 | ||
1da177e4 LT |
431 | static int proc_oom_score(struct task_struct *task, char *buffer) |
432 | { | |
b95c35e7 | 433 | unsigned long points = 0; |
1da177e4 | 434 | |
19c5d45a | 435 | read_lock(&tasklist_lock); |
b95c35e7 | 436 | if (pid_alive(task)) |
a63d83f4 DR |
437 | points = oom_badness(task, NULL, NULL, |
438 | totalram_pages + total_swap_pages); | |
19c5d45a | 439 | read_unlock(&tasklist_lock); |
1da177e4 LT |
440 | return sprintf(buffer, "%lu\n", points); |
441 | } | |
442 | ||
d85f50d5 NH |
443 | struct limit_names { |
444 | char *name; | |
445 | char *unit; | |
446 | }; | |
447 | ||
448 | static const struct limit_names lnames[RLIM_NLIMITS] = { | |
cff4edb5 | 449 | [RLIMIT_CPU] = {"Max cpu time", "seconds"}, |
d85f50d5 NH |
450 | [RLIMIT_FSIZE] = {"Max file size", "bytes"}, |
451 | [RLIMIT_DATA] = {"Max data size", "bytes"}, | |
452 | [RLIMIT_STACK] = {"Max stack size", "bytes"}, | |
453 | [RLIMIT_CORE] = {"Max core file size", "bytes"}, | |
454 | [RLIMIT_RSS] = {"Max resident set", "bytes"}, | |
455 | [RLIMIT_NPROC] = {"Max processes", "processes"}, | |
456 | [RLIMIT_NOFILE] = {"Max open files", "files"}, | |
457 | [RLIMIT_MEMLOCK] = {"Max locked memory", "bytes"}, | |
458 | [RLIMIT_AS] = {"Max address space", "bytes"}, | |
459 | [RLIMIT_LOCKS] = {"Max file locks", "locks"}, | |
460 | [RLIMIT_SIGPENDING] = {"Max pending signals", "signals"}, | |
461 | [RLIMIT_MSGQUEUE] = {"Max msgqueue size", "bytes"}, | |
462 | [RLIMIT_NICE] = {"Max nice priority", NULL}, | |
463 | [RLIMIT_RTPRIO] = {"Max realtime priority", NULL}, | |
8808117c | 464 | [RLIMIT_RTTIME] = {"Max realtime timeout", "us"}, |
d85f50d5 NH |
465 | }; |
466 | ||
467 | /* Display limits for a process */ | |
468 | static int proc_pid_limits(struct task_struct *task, char *buffer) | |
469 | { | |
470 | unsigned int i; | |
471 | int count = 0; | |
472 | unsigned long flags; | |
473 | char *bufptr = buffer; | |
474 | ||
475 | struct rlimit rlim[RLIM_NLIMITS]; | |
476 | ||
a6bebbc8 | 477 | if (!lock_task_sighand(task, &flags)) |
d85f50d5 | 478 | return 0; |
d85f50d5 NH |
479 | memcpy(rlim, task->signal->rlim, sizeof(struct rlimit) * RLIM_NLIMITS); |
480 | unlock_task_sighand(task, &flags); | |
d85f50d5 NH |
481 | |
482 | /* | |
483 | * print the file header | |
484 | */ | |
485 | count += sprintf(&bufptr[count], "%-25s %-20s %-20s %-10s\n", | |
486 | "Limit", "Soft Limit", "Hard Limit", "Units"); | |
487 | ||
488 | for (i = 0; i < RLIM_NLIMITS; i++) { | |
489 | if (rlim[i].rlim_cur == RLIM_INFINITY) | |
490 | count += sprintf(&bufptr[count], "%-25s %-20s ", | |
491 | lnames[i].name, "unlimited"); | |
492 | else | |
493 | count += sprintf(&bufptr[count], "%-25s %-20lu ", | |
494 | lnames[i].name, rlim[i].rlim_cur); | |
495 | ||
496 | if (rlim[i].rlim_max == RLIM_INFINITY) | |
497 | count += sprintf(&bufptr[count], "%-20s ", "unlimited"); | |
498 | else | |
499 | count += sprintf(&bufptr[count], "%-20lu ", | |
500 | rlim[i].rlim_max); | |
501 | ||
502 | if (lnames[i].unit) | |
503 | count += sprintf(&bufptr[count], "%-10s\n", | |
504 | lnames[i].unit); | |
505 | else | |
506 | count += sprintf(&bufptr[count], "\n"); | |
507 | } | |
508 | ||
509 | return count; | |
510 | } | |
511 | ||
ebcb6734 RM |
512 | #ifdef CONFIG_HAVE_ARCH_TRACEHOOK |
513 | static int proc_pid_syscall(struct task_struct *task, char *buffer) | |
514 | { | |
515 | long nr; | |
516 | unsigned long args[6], sp, pc; | |
517 | ||
518 | if (task_current_syscall(task, &nr, args, 6, &sp, &pc)) | |
519 | return sprintf(buffer, "running\n"); | |
520 | ||
521 | if (nr < 0) | |
522 | return sprintf(buffer, "%ld 0x%lx 0x%lx\n", nr, sp, pc); | |
523 | ||
524 | return sprintf(buffer, | |
525 | "%ld 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx\n", | |
526 | nr, | |
527 | args[0], args[1], args[2], args[3], args[4], args[5], | |
528 | sp, pc); | |
529 | } | |
530 | #endif /* CONFIG_HAVE_ARCH_TRACEHOOK */ | |
531 | ||
1da177e4 LT |
532 | /************************************************************************/ |
533 | /* Here the fs part begins */ | |
534 | /************************************************************************/ | |
535 | ||
536 | /* permission checks */ | |
778c1144 | 537 | static int proc_fd_access_allowed(struct inode *inode) |
1da177e4 | 538 | { |
778c1144 EB |
539 | struct task_struct *task; |
540 | int allowed = 0; | |
df26c40e EB |
541 | /* Allow access to a task's file descriptors if it is us or we |
542 | * may use ptrace attach to the process and find out that | |
543 | * information. | |
778c1144 EB |
544 | */ |
545 | task = get_proc_task(inode); | |
df26c40e | 546 | if (task) { |
006ebb40 | 547 | allowed = ptrace_may_access(task, PTRACE_MODE_READ); |
778c1144 | 548 | put_task_struct(task); |
df26c40e | 549 | } |
778c1144 | 550 | return allowed; |
1da177e4 LT |
551 | } |
552 | ||
6d76fa58 LT |
553 | static int proc_setattr(struct dentry *dentry, struct iattr *attr) |
554 | { | |
555 | int error; | |
556 | struct inode *inode = dentry->d_inode; | |
557 | ||
558 | if (attr->ia_valid & ATTR_MODE) | |
559 | return -EPERM; | |
560 | ||
561 | error = inode_change_ok(inode, attr); | |
1025774c CH |
562 | if (error) |
563 | return error; | |
564 | ||
565 | if ((attr->ia_valid & ATTR_SIZE) && | |
566 | attr->ia_size != i_size_read(inode)) { | |
567 | error = vmtruncate(inode, attr->ia_size); | |
568 | if (error) | |
569 | return error; | |
570 | } | |
571 | ||
572 | setattr_copy(inode, attr); | |
573 | mark_inode_dirty(inode); | |
574 | return 0; | |
6d76fa58 LT |
575 | } |
576 | ||
c5ef1c42 | 577 | static const struct inode_operations proc_def_inode_operations = { |
6d76fa58 LT |
578 | .setattr = proc_setattr, |
579 | }; | |
580 | ||
a1a2c409 MS |
581 | static int mounts_open_common(struct inode *inode, struct file *file, |
582 | const struct seq_operations *op) | |
1da177e4 | 583 | { |
99f89551 | 584 | struct task_struct *task = get_proc_task(inode); |
cf7b708c | 585 | struct nsproxy *nsp; |
6b3286ed | 586 | struct mnt_namespace *ns = NULL; |
a1a2c409 | 587 | struct path root; |
5addc5dd AV |
588 | struct proc_mounts *p; |
589 | int ret = -EINVAL; | |
1da177e4 | 590 | |
99f89551 | 591 | if (task) { |
cf7b708c PE |
592 | rcu_read_lock(); |
593 | nsp = task_nsproxy(task); | |
594 | if (nsp) { | |
595 | ns = nsp->mnt_ns; | |
863c4702 AD |
596 | if (ns) |
597 | get_mnt_ns(ns); | |
598 | } | |
cf7b708c | 599 | rcu_read_unlock(); |
f7ad3c6b | 600 | if (ns && get_task_root(task, &root) == 0) |
7c2c7d99 | 601 | ret = 0; |
99f89551 EB |
602 | put_task_struct(task); |
603 | } | |
5addc5dd | 604 | |
a1a2c409 MS |
605 | if (!ns) |
606 | goto err; | |
7c2c7d99 | 607 | if (ret) |
a1a2c409 MS |
608 | goto err_put_ns; |
609 | ||
a1a2c409 MS |
610 | ret = -ENOMEM; |
611 | p = kmalloc(sizeof(struct proc_mounts), GFP_KERNEL); | |
612 | if (!p) | |
613 | goto err_put_path; | |
614 | ||
615 | file->private_data = &p->m; | |
616 | ret = seq_open(file, op); | |
617 | if (ret) | |
618 | goto err_free; | |
619 | ||
620 | p->m.private = p; | |
621 | p->ns = ns; | |
622 | p->root = root; | |
623 | p->event = ns->event; | |
624 | ||
625 | return 0; | |
626 | ||
627 | err_free: | |
628 | kfree(p); | |
629 | err_put_path: | |
630 | path_put(&root); | |
631 | err_put_ns: | |
632 | put_mnt_ns(ns); | |
633 | err: | |
1da177e4 LT |
634 | return ret; |
635 | } | |
636 | ||
637 | static int mounts_release(struct inode *inode, struct file *file) | |
638 | { | |
a1a2c409 MS |
639 | struct proc_mounts *p = file->private_data; |
640 | path_put(&p->root); | |
641 | put_mnt_ns(p->ns); | |
1da177e4 LT |
642 | return seq_release(inode, file); |
643 | } | |
644 | ||
5addc5dd AV |
645 | static unsigned mounts_poll(struct file *file, poll_table *wait) |
646 | { | |
647 | struct proc_mounts *p = file->private_data; | |
31b07093 | 648 | unsigned res = POLLIN | POLLRDNORM; |
5addc5dd | 649 | |
9f5596af AV |
650 | poll_wait(file, &p->ns->poll, wait); |
651 | if (mnt_had_events(p)) | |
31b07093 | 652 | res |= POLLERR | POLLPRI; |
5addc5dd AV |
653 | |
654 | return res; | |
655 | } | |
656 | ||
a1a2c409 MS |
657 | static int mounts_open(struct inode *inode, struct file *file) |
658 | { | |
659 | return mounts_open_common(inode, file, &mounts_op); | |
660 | } | |
661 | ||
00977a59 | 662 | static const struct file_operations proc_mounts_operations = { |
1da177e4 LT |
663 | .open = mounts_open, |
664 | .read = seq_read, | |
665 | .llseek = seq_lseek, | |
666 | .release = mounts_release, | |
5addc5dd | 667 | .poll = mounts_poll, |
1da177e4 LT |
668 | }; |
669 | ||
2d4d4864 RP |
670 | static int mountinfo_open(struct inode *inode, struct file *file) |
671 | { | |
672 | return mounts_open_common(inode, file, &mountinfo_op); | |
673 | } | |
674 | ||
675 | static const struct file_operations proc_mountinfo_operations = { | |
676 | .open = mountinfo_open, | |
677 | .read = seq_read, | |
678 | .llseek = seq_lseek, | |
679 | .release = mounts_release, | |
680 | .poll = mounts_poll, | |
681 | }; | |
682 | ||
b4629fe2 CL |
683 | static int mountstats_open(struct inode *inode, struct file *file) |
684 | { | |
a1a2c409 | 685 | return mounts_open_common(inode, file, &mountstats_op); |
b4629fe2 CL |
686 | } |
687 | ||
00977a59 | 688 | static const struct file_operations proc_mountstats_operations = { |
b4629fe2 CL |
689 | .open = mountstats_open, |
690 | .read = seq_read, | |
691 | .llseek = seq_lseek, | |
692 | .release = mounts_release, | |
693 | }; | |
694 | ||
1da177e4 LT |
695 | #define PROC_BLOCK_SIZE (3*1024) /* 4K page size but our output routines use some slack for overruns */ |
696 | ||
697 | static ssize_t proc_info_read(struct file * file, char __user * buf, | |
698 | size_t count, loff_t *ppos) | |
699 | { | |
2fddfeef | 700 | struct inode * inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
701 | unsigned long page; |
702 | ssize_t length; | |
99f89551 EB |
703 | struct task_struct *task = get_proc_task(inode); |
704 | ||
705 | length = -ESRCH; | |
706 | if (!task) | |
707 | goto out_no_task; | |
1da177e4 LT |
708 | |
709 | if (count > PROC_BLOCK_SIZE) | |
710 | count = PROC_BLOCK_SIZE; | |
99f89551 EB |
711 | |
712 | length = -ENOMEM; | |
e12ba74d | 713 | if (!(page = __get_free_page(GFP_TEMPORARY))) |
99f89551 | 714 | goto out; |
1da177e4 LT |
715 | |
716 | length = PROC_I(inode)->op.proc_read(task, (char*)page); | |
717 | ||
718 | if (length >= 0) | |
719 | length = simple_read_from_buffer(buf, count, ppos, (char *)page, length); | |
720 | free_page(page); | |
99f89551 EB |
721 | out: |
722 | put_task_struct(task); | |
723 | out_no_task: | |
1da177e4 LT |
724 | return length; |
725 | } | |
726 | ||
00977a59 | 727 | static const struct file_operations proc_info_file_operations = { |
1da177e4 | 728 | .read = proc_info_read, |
87df8424 | 729 | .llseek = generic_file_llseek, |
1da177e4 LT |
730 | }; |
731 | ||
be614086 EB |
732 | static int proc_single_show(struct seq_file *m, void *v) |
733 | { | |
734 | struct inode *inode = m->private; | |
735 | struct pid_namespace *ns; | |
736 | struct pid *pid; | |
737 | struct task_struct *task; | |
738 | int ret; | |
739 | ||
740 | ns = inode->i_sb->s_fs_info; | |
741 | pid = proc_pid(inode); | |
742 | task = get_pid_task(pid, PIDTYPE_PID); | |
743 | if (!task) | |
744 | return -ESRCH; | |
745 | ||
746 | ret = PROC_I(inode)->op.proc_show(m, ns, pid, task); | |
747 | ||
748 | put_task_struct(task); | |
749 | return ret; | |
750 | } | |
751 | ||
752 | static int proc_single_open(struct inode *inode, struct file *filp) | |
753 | { | |
754 | int ret; | |
755 | ret = single_open(filp, proc_single_show, NULL); | |
756 | if (!ret) { | |
757 | struct seq_file *m = filp->private_data; | |
758 | ||
759 | m->private = inode; | |
760 | } | |
761 | return ret; | |
762 | } | |
763 | ||
764 | static const struct file_operations proc_single_file_operations = { | |
765 | .open = proc_single_open, | |
766 | .read = seq_read, | |
767 | .llseek = seq_lseek, | |
768 | .release = single_release, | |
769 | }; | |
770 | ||
1da177e4 LT |
771 | static int mem_open(struct inode* inode, struct file* file) |
772 | { | |
773 | file->private_data = (void*)((long)current->self_exec_id); | |
4a3956c7 KH |
774 | /* OK to pass negative loff_t, we can catch out-of-range */ |
775 | file->f_mode |= FMODE_UNSIGNED_OFFSET; | |
1da177e4 LT |
776 | return 0; |
777 | } | |
778 | ||
779 | static ssize_t mem_read(struct file * file, char __user * buf, | |
780 | size_t count, loff_t *ppos) | |
781 | { | |
2fddfeef | 782 | struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode); |
1da177e4 LT |
783 | char *page; |
784 | unsigned long src = *ppos; | |
785 | int ret = -ESRCH; | |
786 | struct mm_struct *mm; | |
787 | ||
99f89551 EB |
788 | if (!task) |
789 | goto out_no_task; | |
790 | ||
638fa202 | 791 | if (check_mem_permission(task)) |
1da177e4 LT |
792 | goto out; |
793 | ||
794 | ret = -ENOMEM; | |
e12ba74d | 795 | page = (char *)__get_free_page(GFP_TEMPORARY); |
1da177e4 LT |
796 | if (!page) |
797 | goto out; | |
798 | ||
799 | ret = 0; | |
800 | ||
801 | mm = get_task_mm(task); | |
802 | if (!mm) | |
803 | goto out_free; | |
804 | ||
805 | ret = -EIO; | |
806 | ||
807 | if (file->private_data != (void*)((long)current->self_exec_id)) | |
808 | goto out_put; | |
809 | ||
810 | ret = 0; | |
811 | ||
812 | while (count > 0) { | |
813 | int this_len, retval; | |
814 | ||
815 | this_len = (count > PAGE_SIZE) ? PAGE_SIZE : count; | |
816 | retval = access_process_vm(task, src, page, this_len, 0); | |
638fa202 | 817 | if (!retval || check_mem_permission(task)) { |
1da177e4 LT |
818 | if (!ret) |
819 | ret = -EIO; | |
820 | break; | |
821 | } | |
822 | ||
823 | if (copy_to_user(buf, page, retval)) { | |
824 | ret = -EFAULT; | |
825 | break; | |
826 | } | |
827 | ||
828 | ret += retval; | |
829 | src += retval; | |
830 | buf += retval; | |
831 | count -= retval; | |
832 | } | |
833 | *ppos = src; | |
834 | ||
835 | out_put: | |
836 | mmput(mm); | |
837 | out_free: | |
838 | free_page((unsigned long) page); | |
839 | out: | |
99f89551 EB |
840 | put_task_struct(task); |
841 | out_no_task: | |
1da177e4 LT |
842 | return ret; |
843 | } | |
844 | ||
845 | #define mem_write NULL | |
846 | ||
847 | #ifndef mem_write | |
848 | /* This is a security hazard */ | |
63967fa9 | 849 | static ssize_t mem_write(struct file * file, const char __user *buf, |
1da177e4 LT |
850 | size_t count, loff_t *ppos) |
851 | { | |
f7ca54f4 | 852 | int copied; |
1da177e4 | 853 | char *page; |
2fddfeef | 854 | struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode); |
1da177e4 LT |
855 | unsigned long dst = *ppos; |
856 | ||
99f89551 EB |
857 | copied = -ESRCH; |
858 | if (!task) | |
859 | goto out_no_task; | |
860 | ||
638fa202 | 861 | if (check_mem_permission(task)) |
99f89551 | 862 | goto out; |
1da177e4 | 863 | |
99f89551 | 864 | copied = -ENOMEM; |
e12ba74d | 865 | page = (char *)__get_free_page(GFP_TEMPORARY); |
1da177e4 | 866 | if (!page) |
99f89551 | 867 | goto out; |
1da177e4 | 868 | |
f7ca54f4 | 869 | copied = 0; |
1da177e4 LT |
870 | while (count > 0) { |
871 | int this_len, retval; | |
872 | ||
873 | this_len = (count > PAGE_SIZE) ? PAGE_SIZE : count; | |
874 | if (copy_from_user(page, buf, this_len)) { | |
875 | copied = -EFAULT; | |
876 | break; | |
877 | } | |
878 | retval = access_process_vm(task, dst, page, this_len, 1); | |
879 | if (!retval) { | |
880 | if (!copied) | |
881 | copied = -EIO; | |
882 | break; | |
883 | } | |
884 | copied += retval; | |
885 | buf += retval; | |
886 | dst += retval; | |
887 | count -= retval; | |
888 | } | |
889 | *ppos = dst; | |
890 | free_page((unsigned long) page); | |
99f89551 EB |
891 | out: |
892 | put_task_struct(task); | |
893 | out_no_task: | |
1da177e4 LT |
894 | return copied; |
895 | } | |
896 | #endif | |
897 | ||
85863e47 | 898 | loff_t mem_lseek(struct file *file, loff_t offset, int orig) |
1da177e4 LT |
899 | { |
900 | switch (orig) { | |
901 | case 0: | |
902 | file->f_pos = offset; | |
903 | break; | |
904 | case 1: | |
905 | file->f_pos += offset; | |
906 | break; | |
907 | default: | |
908 | return -EINVAL; | |
909 | } | |
910 | force_successful_syscall_return(); | |
911 | return file->f_pos; | |
912 | } | |
913 | ||
00977a59 | 914 | static const struct file_operations proc_mem_operations = { |
1da177e4 LT |
915 | .llseek = mem_lseek, |
916 | .read = mem_read, | |
917 | .write = mem_write, | |
918 | .open = mem_open, | |
919 | }; | |
920 | ||
315e28c8 JP |
921 | static ssize_t environ_read(struct file *file, char __user *buf, |
922 | size_t count, loff_t *ppos) | |
923 | { | |
924 | struct task_struct *task = get_proc_task(file->f_dentry->d_inode); | |
925 | char *page; | |
926 | unsigned long src = *ppos; | |
927 | int ret = -ESRCH; | |
928 | struct mm_struct *mm; | |
929 | ||
930 | if (!task) | |
931 | goto out_no_task; | |
932 | ||
006ebb40 | 933 | if (!ptrace_may_access(task, PTRACE_MODE_READ)) |
315e28c8 JP |
934 | goto out; |
935 | ||
936 | ret = -ENOMEM; | |
937 | page = (char *)__get_free_page(GFP_TEMPORARY); | |
938 | if (!page) | |
939 | goto out; | |
940 | ||
941 | ret = 0; | |
942 | ||
943 | mm = get_task_mm(task); | |
944 | if (!mm) | |
945 | goto out_free; | |
946 | ||
947 | while (count > 0) { | |
948 | int this_len, retval, max_len; | |
949 | ||
950 | this_len = mm->env_end - (mm->env_start + src); | |
951 | ||
952 | if (this_len <= 0) | |
953 | break; | |
954 | ||
955 | max_len = (count > PAGE_SIZE) ? PAGE_SIZE : count; | |
956 | this_len = (this_len > max_len) ? max_len : this_len; | |
957 | ||
958 | retval = access_process_vm(task, (mm->env_start + src), | |
959 | page, this_len, 0); | |
960 | ||
961 | if (retval <= 0) { | |
962 | ret = retval; | |
963 | break; | |
964 | } | |
965 | ||
966 | if (copy_to_user(buf, page, retval)) { | |
967 | ret = -EFAULT; | |
968 | break; | |
969 | } | |
970 | ||
971 | ret += retval; | |
972 | src += retval; | |
973 | buf += retval; | |
974 | count -= retval; | |
975 | } | |
976 | *ppos = src; | |
977 | ||
978 | mmput(mm); | |
979 | out_free: | |
980 | free_page((unsigned long) page); | |
981 | out: | |
982 | put_task_struct(task); | |
983 | out_no_task: | |
984 | return ret; | |
985 | } | |
986 | ||
987 | static const struct file_operations proc_environ_operations = { | |
988 | .read = environ_read, | |
87df8424 | 989 | .llseek = generic_file_llseek, |
315e28c8 JP |
990 | }; |
991 | ||
1da177e4 LT |
992 | static ssize_t oom_adjust_read(struct file *file, char __user *buf, |
993 | size_t count, loff_t *ppos) | |
994 | { | |
2fddfeef | 995 | struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode); |
8578cea7 | 996 | char buffer[PROC_NUMBUF]; |
1da177e4 | 997 | size_t len; |
28b83c51 KM |
998 | int oom_adjust = OOM_DISABLE; |
999 | unsigned long flags; | |
1da177e4 | 1000 | |
99f89551 EB |
1001 | if (!task) |
1002 | return -ESRCH; | |
28b83c51 KM |
1003 | |
1004 | if (lock_task_sighand(task, &flags)) { | |
1005 | oom_adjust = task->signal->oom_adj; | |
1006 | unlock_task_sighand(task, &flags); | |
1007 | } | |
1008 | ||
99f89551 EB |
1009 | put_task_struct(task); |
1010 | ||
8578cea7 | 1011 | len = snprintf(buffer, sizeof(buffer), "%i\n", oom_adjust); |
0c28f287 AM |
1012 | |
1013 | return simple_read_from_buffer(buf, count, ppos, buffer, len); | |
1da177e4 LT |
1014 | } |
1015 | ||
1016 | static ssize_t oom_adjust_write(struct file *file, const char __user *buf, | |
1017 | size_t count, loff_t *ppos) | |
1018 | { | |
99f89551 | 1019 | struct task_struct *task; |
5d863b89 KM |
1020 | char buffer[PROC_NUMBUF]; |
1021 | long oom_adjust; | |
28b83c51 | 1022 | unsigned long flags; |
5d863b89 | 1023 | int err; |
1da177e4 | 1024 | |
8578cea7 EB |
1025 | memset(buffer, 0, sizeof(buffer)); |
1026 | if (count > sizeof(buffer) - 1) | |
1027 | count = sizeof(buffer) - 1; | |
1da177e4 LT |
1028 | if (copy_from_user(buffer, buf, count)) |
1029 | return -EFAULT; | |
5d863b89 KM |
1030 | |
1031 | err = strict_strtol(strstrip(buffer), 0, &oom_adjust); | |
1032 | if (err) | |
1033 | return -EINVAL; | |
8ac773b4 AD |
1034 | if ((oom_adjust < OOM_ADJUST_MIN || oom_adjust > OOM_ADJUST_MAX) && |
1035 | oom_adjust != OOM_DISABLE) | |
1da177e4 | 1036 | return -EINVAL; |
5d863b89 | 1037 | |
2fddfeef | 1038 | task = get_proc_task(file->f_path.dentry->d_inode); |
99f89551 EB |
1039 | if (!task) |
1040 | return -ESRCH; | |
28b83c51 KM |
1041 | if (!lock_task_sighand(task, &flags)) { |
1042 | put_task_struct(task); | |
1043 | return -ESRCH; | |
1044 | } | |
1045 | ||
1046 | if (oom_adjust < task->signal->oom_adj && !capable(CAP_SYS_RESOURCE)) { | |
1047 | unlock_task_sighand(task, &flags); | |
8fb4fc68 GJ |
1048 | put_task_struct(task); |
1049 | return -EACCES; | |
1050 | } | |
28b83c51 | 1051 | |
51b1bd2a DR |
1052 | /* |
1053 | * Warn that /proc/pid/oom_adj is deprecated, see | |
1054 | * Documentation/feature-removal-schedule.txt. | |
1055 | */ | |
1056 | printk_once(KERN_WARNING "%s (%d): /proc/%d/oom_adj is deprecated, " | |
1057 | "please use /proc/%d/oom_score_adj instead.\n", | |
1058 | current->comm, task_pid_nr(current), | |
1059 | task_pid_nr(task), task_pid_nr(task)); | |
28b83c51 | 1060 | task->signal->oom_adj = oom_adjust; |
a63d83f4 DR |
1061 | /* |
1062 | * Scale /proc/pid/oom_score_adj appropriately ensuring that a maximum | |
1063 | * value is always attainable. | |
1064 | */ | |
1065 | if (task->signal->oom_adj == OOM_ADJUST_MAX) | |
1066 | task->signal->oom_score_adj = OOM_SCORE_ADJ_MAX; | |
1067 | else | |
1068 | task->signal->oom_score_adj = (oom_adjust * OOM_SCORE_ADJ_MAX) / | |
1069 | -OOM_DISABLE; | |
28b83c51 | 1070 | unlock_task_sighand(task, &flags); |
99f89551 | 1071 | put_task_struct(task); |
5d863b89 KM |
1072 | |
1073 | return count; | |
1da177e4 LT |
1074 | } |
1075 | ||
00977a59 | 1076 | static const struct file_operations proc_oom_adjust_operations = { |
1da177e4 LT |
1077 | .read = oom_adjust_read, |
1078 | .write = oom_adjust_write, | |
87df8424 | 1079 | .llseek = generic_file_llseek, |
1da177e4 LT |
1080 | }; |
1081 | ||
a63d83f4 DR |
1082 | static ssize_t oom_score_adj_read(struct file *file, char __user *buf, |
1083 | size_t count, loff_t *ppos) | |
1084 | { | |
1085 | struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode); | |
1086 | char buffer[PROC_NUMBUF]; | |
1087 | int oom_score_adj = OOM_SCORE_ADJ_MIN; | |
1088 | unsigned long flags; | |
1089 | size_t len; | |
1090 | ||
1091 | if (!task) | |
1092 | return -ESRCH; | |
1093 | if (lock_task_sighand(task, &flags)) { | |
1094 | oom_score_adj = task->signal->oom_score_adj; | |
1095 | unlock_task_sighand(task, &flags); | |
1096 | } | |
1097 | put_task_struct(task); | |
1098 | len = snprintf(buffer, sizeof(buffer), "%d\n", oom_score_adj); | |
1099 | return simple_read_from_buffer(buf, count, ppos, buffer, len); | |
1100 | } | |
1101 | ||
1102 | static ssize_t oom_score_adj_write(struct file *file, const char __user *buf, | |
1103 | size_t count, loff_t *ppos) | |
1104 | { | |
1105 | struct task_struct *task; | |
1106 | char buffer[PROC_NUMBUF]; | |
1107 | unsigned long flags; | |
1108 | long oom_score_adj; | |
1109 | int err; | |
1110 | ||
1111 | memset(buffer, 0, sizeof(buffer)); | |
1112 | if (count > sizeof(buffer) - 1) | |
1113 | count = sizeof(buffer) - 1; | |
1114 | if (copy_from_user(buffer, buf, count)) | |
1115 | return -EFAULT; | |
1116 | ||
1117 | err = strict_strtol(strstrip(buffer), 0, &oom_score_adj); | |
1118 | if (err) | |
1119 | return -EINVAL; | |
1120 | if (oom_score_adj < OOM_SCORE_ADJ_MIN || | |
1121 | oom_score_adj > OOM_SCORE_ADJ_MAX) | |
1122 | return -EINVAL; | |
1123 | ||
1124 | task = get_proc_task(file->f_path.dentry->d_inode); | |
1125 | if (!task) | |
1126 | return -ESRCH; | |
1127 | if (!lock_task_sighand(task, &flags)) { | |
1128 | put_task_struct(task); | |
1129 | return -ESRCH; | |
1130 | } | |
1131 | if (oom_score_adj < task->signal->oom_score_adj && | |
1132 | !capable(CAP_SYS_RESOURCE)) { | |
1133 | unlock_task_sighand(task, &flags); | |
1134 | put_task_struct(task); | |
1135 | return -EACCES; | |
1136 | } | |
1137 | ||
1138 | task->signal->oom_score_adj = oom_score_adj; | |
1139 | /* | |
1140 | * Scale /proc/pid/oom_adj appropriately ensuring that OOM_DISABLE is | |
1141 | * always attainable. | |
1142 | */ | |
1143 | if (task->signal->oom_score_adj == OOM_SCORE_ADJ_MIN) | |
1144 | task->signal->oom_adj = OOM_DISABLE; | |
1145 | else | |
1146 | task->signal->oom_adj = (oom_score_adj * OOM_ADJUST_MAX) / | |
1147 | OOM_SCORE_ADJ_MAX; | |
1148 | unlock_task_sighand(task, &flags); | |
1149 | put_task_struct(task); | |
1150 | return count; | |
1151 | } | |
1152 | ||
1153 | static const struct file_operations proc_oom_score_adj_operations = { | |
1154 | .read = oom_score_adj_read, | |
1155 | .write = oom_score_adj_write, | |
6038f373 | 1156 | .llseek = default_llseek, |
a63d83f4 DR |
1157 | }; |
1158 | ||
1da177e4 LT |
1159 | #ifdef CONFIG_AUDITSYSCALL |
1160 | #define TMPBUFLEN 21 | |
1161 | static ssize_t proc_loginuid_read(struct file * file, char __user * buf, | |
1162 | size_t count, loff_t *ppos) | |
1163 | { | |
2fddfeef | 1164 | struct inode * inode = file->f_path.dentry->d_inode; |
99f89551 | 1165 | struct task_struct *task = get_proc_task(inode); |
1da177e4 LT |
1166 | ssize_t length; |
1167 | char tmpbuf[TMPBUFLEN]; | |
1168 | ||
99f89551 EB |
1169 | if (!task) |
1170 | return -ESRCH; | |
1da177e4 | 1171 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", |
0c11b942 | 1172 | audit_get_loginuid(task)); |
99f89551 | 1173 | put_task_struct(task); |
1da177e4 LT |
1174 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); |
1175 | } | |
1176 | ||
1177 | static ssize_t proc_loginuid_write(struct file * file, const char __user * buf, | |
1178 | size_t count, loff_t *ppos) | |
1179 | { | |
2fddfeef | 1180 | struct inode * inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
1181 | char *page, *tmp; |
1182 | ssize_t length; | |
1da177e4 LT |
1183 | uid_t loginuid; |
1184 | ||
1185 | if (!capable(CAP_AUDIT_CONTROL)) | |
1186 | return -EPERM; | |
1187 | ||
7dc52157 PM |
1188 | rcu_read_lock(); |
1189 | if (current != pid_task(proc_pid(inode), PIDTYPE_PID)) { | |
1190 | rcu_read_unlock(); | |
1da177e4 | 1191 | return -EPERM; |
7dc52157 PM |
1192 | } |
1193 | rcu_read_unlock(); | |
1da177e4 | 1194 | |
e0182909 AV |
1195 | if (count >= PAGE_SIZE) |
1196 | count = PAGE_SIZE - 1; | |
1da177e4 LT |
1197 | |
1198 | if (*ppos != 0) { | |
1199 | /* No partial writes. */ | |
1200 | return -EINVAL; | |
1201 | } | |
e12ba74d | 1202 | page = (char*)__get_free_page(GFP_TEMPORARY); |
1da177e4 LT |
1203 | if (!page) |
1204 | return -ENOMEM; | |
1205 | length = -EFAULT; | |
1206 | if (copy_from_user(page, buf, count)) | |
1207 | goto out_free_page; | |
1208 | ||
e0182909 | 1209 | page[count] = '\0'; |
1da177e4 LT |
1210 | loginuid = simple_strtoul(page, &tmp, 10); |
1211 | if (tmp == page) { | |
1212 | length = -EINVAL; | |
1213 | goto out_free_page; | |
1214 | ||
1215 | } | |
99f89551 | 1216 | length = audit_set_loginuid(current, loginuid); |
1da177e4 LT |
1217 | if (likely(length == 0)) |
1218 | length = count; | |
1219 | ||
1220 | out_free_page: | |
1221 | free_page((unsigned long) page); | |
1222 | return length; | |
1223 | } | |
1224 | ||
00977a59 | 1225 | static const struct file_operations proc_loginuid_operations = { |
1da177e4 LT |
1226 | .read = proc_loginuid_read, |
1227 | .write = proc_loginuid_write, | |
87df8424 | 1228 | .llseek = generic_file_llseek, |
1da177e4 | 1229 | }; |
1e0bd755 EP |
1230 | |
1231 | static ssize_t proc_sessionid_read(struct file * file, char __user * buf, | |
1232 | size_t count, loff_t *ppos) | |
1233 | { | |
1234 | struct inode * inode = file->f_path.dentry->d_inode; | |
1235 | struct task_struct *task = get_proc_task(inode); | |
1236 | ssize_t length; | |
1237 | char tmpbuf[TMPBUFLEN]; | |
1238 | ||
1239 | if (!task) | |
1240 | return -ESRCH; | |
1241 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", | |
1242 | audit_get_sessionid(task)); | |
1243 | put_task_struct(task); | |
1244 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
1245 | } | |
1246 | ||
1247 | static const struct file_operations proc_sessionid_operations = { | |
1248 | .read = proc_sessionid_read, | |
87df8424 | 1249 | .llseek = generic_file_llseek, |
1e0bd755 | 1250 | }; |
1da177e4 LT |
1251 | #endif |
1252 | ||
f4f154fd AM |
1253 | #ifdef CONFIG_FAULT_INJECTION |
1254 | static ssize_t proc_fault_inject_read(struct file * file, char __user * buf, | |
1255 | size_t count, loff_t *ppos) | |
1256 | { | |
1257 | struct task_struct *task = get_proc_task(file->f_dentry->d_inode); | |
1258 | char buffer[PROC_NUMBUF]; | |
1259 | size_t len; | |
1260 | int make_it_fail; | |
f4f154fd AM |
1261 | |
1262 | if (!task) | |
1263 | return -ESRCH; | |
1264 | make_it_fail = task->make_it_fail; | |
1265 | put_task_struct(task); | |
1266 | ||
1267 | len = snprintf(buffer, sizeof(buffer), "%i\n", make_it_fail); | |
0c28f287 AM |
1268 | |
1269 | return simple_read_from_buffer(buf, count, ppos, buffer, len); | |
f4f154fd AM |
1270 | } |
1271 | ||
1272 | static ssize_t proc_fault_inject_write(struct file * file, | |
1273 | const char __user * buf, size_t count, loff_t *ppos) | |
1274 | { | |
1275 | struct task_struct *task; | |
1276 | char buffer[PROC_NUMBUF], *end; | |
1277 | int make_it_fail; | |
1278 | ||
1279 | if (!capable(CAP_SYS_RESOURCE)) | |
1280 | return -EPERM; | |
1281 | memset(buffer, 0, sizeof(buffer)); | |
1282 | if (count > sizeof(buffer) - 1) | |
1283 | count = sizeof(buffer) - 1; | |
1284 | if (copy_from_user(buffer, buf, count)) | |
1285 | return -EFAULT; | |
cba8aafe VL |
1286 | make_it_fail = simple_strtol(strstrip(buffer), &end, 0); |
1287 | if (*end) | |
1288 | return -EINVAL; | |
f4f154fd AM |
1289 | task = get_proc_task(file->f_dentry->d_inode); |
1290 | if (!task) | |
1291 | return -ESRCH; | |
1292 | task->make_it_fail = make_it_fail; | |
1293 | put_task_struct(task); | |
cba8aafe VL |
1294 | |
1295 | return count; | |
f4f154fd AM |
1296 | } |
1297 | ||
00977a59 | 1298 | static const struct file_operations proc_fault_inject_operations = { |
f4f154fd AM |
1299 | .read = proc_fault_inject_read, |
1300 | .write = proc_fault_inject_write, | |
87df8424 | 1301 | .llseek = generic_file_llseek, |
f4f154fd AM |
1302 | }; |
1303 | #endif | |
1304 | ||
9745512c | 1305 | |
43ae34cb IM |
1306 | #ifdef CONFIG_SCHED_DEBUG |
1307 | /* | |
1308 | * Print out various scheduling related per-task fields: | |
1309 | */ | |
1310 | static int sched_show(struct seq_file *m, void *v) | |
1311 | { | |
1312 | struct inode *inode = m->private; | |
1313 | struct task_struct *p; | |
1314 | ||
43ae34cb IM |
1315 | p = get_proc_task(inode); |
1316 | if (!p) | |
1317 | return -ESRCH; | |
1318 | proc_sched_show_task(p, m); | |
1319 | ||
1320 | put_task_struct(p); | |
1321 | ||
1322 | return 0; | |
1323 | } | |
1324 | ||
1325 | static ssize_t | |
1326 | sched_write(struct file *file, const char __user *buf, | |
1327 | size_t count, loff_t *offset) | |
1328 | { | |
1329 | struct inode *inode = file->f_path.dentry->d_inode; | |
1330 | struct task_struct *p; | |
1331 | ||
43ae34cb IM |
1332 | p = get_proc_task(inode); |
1333 | if (!p) | |
1334 | return -ESRCH; | |
1335 | proc_sched_set_task(p); | |
1336 | ||
1337 | put_task_struct(p); | |
1338 | ||
1339 | return count; | |
1340 | } | |
1341 | ||
1342 | static int sched_open(struct inode *inode, struct file *filp) | |
1343 | { | |
1344 | int ret; | |
1345 | ||
1346 | ret = single_open(filp, sched_show, NULL); | |
1347 | if (!ret) { | |
1348 | struct seq_file *m = filp->private_data; | |
1349 | ||
1350 | m->private = inode; | |
1351 | } | |
1352 | return ret; | |
1353 | } | |
1354 | ||
1355 | static const struct file_operations proc_pid_sched_operations = { | |
1356 | .open = sched_open, | |
1357 | .read = seq_read, | |
1358 | .write = sched_write, | |
1359 | .llseek = seq_lseek, | |
5ea473a1 | 1360 | .release = single_release, |
43ae34cb IM |
1361 | }; |
1362 | ||
1363 | #endif | |
1364 | ||
4614a696 JS |
1365 | static ssize_t comm_write(struct file *file, const char __user *buf, |
1366 | size_t count, loff_t *offset) | |
1367 | { | |
1368 | struct inode *inode = file->f_path.dentry->d_inode; | |
1369 | struct task_struct *p; | |
1370 | char buffer[TASK_COMM_LEN]; | |
1371 | ||
1372 | memset(buffer, 0, sizeof(buffer)); | |
1373 | if (count > sizeof(buffer) - 1) | |
1374 | count = sizeof(buffer) - 1; | |
1375 | if (copy_from_user(buffer, buf, count)) | |
1376 | return -EFAULT; | |
1377 | ||
1378 | p = get_proc_task(inode); | |
1379 | if (!p) | |
1380 | return -ESRCH; | |
1381 | ||
1382 | if (same_thread_group(current, p)) | |
1383 | set_task_comm(p, buffer); | |
1384 | else | |
1385 | count = -EINVAL; | |
1386 | ||
1387 | put_task_struct(p); | |
1388 | ||
1389 | return count; | |
1390 | } | |
1391 | ||
1392 | static int comm_show(struct seq_file *m, void *v) | |
1393 | { | |
1394 | struct inode *inode = m->private; | |
1395 | struct task_struct *p; | |
1396 | ||
1397 | p = get_proc_task(inode); | |
1398 | if (!p) | |
1399 | return -ESRCH; | |
1400 | ||
1401 | task_lock(p); | |
1402 | seq_printf(m, "%s\n", p->comm); | |
1403 | task_unlock(p); | |
1404 | ||
1405 | put_task_struct(p); | |
1406 | ||
1407 | return 0; | |
1408 | } | |
1409 | ||
1410 | static int comm_open(struct inode *inode, struct file *filp) | |
1411 | { | |
1412 | int ret; | |
1413 | ||
1414 | ret = single_open(filp, comm_show, NULL); | |
1415 | if (!ret) { | |
1416 | struct seq_file *m = filp->private_data; | |
1417 | ||
1418 | m->private = inode; | |
1419 | } | |
1420 | return ret; | |
1421 | } | |
1422 | ||
1423 | static const struct file_operations proc_pid_set_comm_operations = { | |
1424 | .open = comm_open, | |
1425 | .read = seq_read, | |
1426 | .write = comm_write, | |
1427 | .llseek = seq_lseek, | |
1428 | .release = single_release, | |
1429 | }; | |
1430 | ||
925d1c40 MH |
1431 | /* |
1432 | * We added or removed a vma mapping the executable. The vmas are only mapped | |
1433 | * during exec and are not mapped with the mmap system call. | |
1434 | * Callers must hold down_write() on the mm's mmap_sem for these | |
1435 | */ | |
1436 | void added_exe_file_vma(struct mm_struct *mm) | |
1437 | { | |
1438 | mm->num_exe_file_vmas++; | |
1439 | } | |
1440 | ||
1441 | void removed_exe_file_vma(struct mm_struct *mm) | |
1442 | { | |
1443 | mm->num_exe_file_vmas--; | |
1444 | if ((mm->num_exe_file_vmas == 0) && mm->exe_file){ | |
1445 | fput(mm->exe_file); | |
1446 | mm->exe_file = NULL; | |
1447 | } | |
1448 | ||
1449 | } | |
1450 | ||
1451 | void set_mm_exe_file(struct mm_struct *mm, struct file *new_exe_file) | |
1452 | { | |
1453 | if (new_exe_file) | |
1454 | get_file(new_exe_file); | |
1455 | if (mm->exe_file) | |
1456 | fput(mm->exe_file); | |
1457 | mm->exe_file = new_exe_file; | |
1458 | mm->num_exe_file_vmas = 0; | |
1459 | } | |
1460 | ||
1461 | struct file *get_mm_exe_file(struct mm_struct *mm) | |
1462 | { | |
1463 | struct file *exe_file; | |
1464 | ||
1465 | /* We need mmap_sem to protect against races with removal of | |
1466 | * VM_EXECUTABLE vmas */ | |
1467 | down_read(&mm->mmap_sem); | |
1468 | exe_file = mm->exe_file; | |
1469 | if (exe_file) | |
1470 | get_file(exe_file); | |
1471 | up_read(&mm->mmap_sem); | |
1472 | return exe_file; | |
1473 | } | |
1474 | ||
1475 | void dup_mm_exe_file(struct mm_struct *oldmm, struct mm_struct *newmm) | |
1476 | { | |
1477 | /* It's safe to write the exe_file pointer without exe_file_lock because | |
1478 | * this is called during fork when the task is not yet in /proc */ | |
1479 | newmm->exe_file = get_mm_exe_file(oldmm); | |
1480 | } | |
1481 | ||
1482 | static int proc_exe_link(struct inode *inode, struct path *exe_path) | |
1483 | { | |
1484 | struct task_struct *task; | |
1485 | struct mm_struct *mm; | |
1486 | struct file *exe_file; | |
1487 | ||
1488 | task = get_proc_task(inode); | |
1489 | if (!task) | |
1490 | return -ENOENT; | |
1491 | mm = get_task_mm(task); | |
1492 | put_task_struct(task); | |
1493 | if (!mm) | |
1494 | return -ENOENT; | |
1495 | exe_file = get_mm_exe_file(mm); | |
1496 | mmput(mm); | |
1497 | if (exe_file) { | |
1498 | *exe_path = exe_file->f_path; | |
1499 | path_get(&exe_file->f_path); | |
1500 | fput(exe_file); | |
1501 | return 0; | |
1502 | } else | |
1503 | return -ENOENT; | |
1504 | } | |
1505 | ||
008b150a | 1506 | static void *proc_pid_follow_link(struct dentry *dentry, struct nameidata *nd) |
1da177e4 LT |
1507 | { |
1508 | struct inode *inode = dentry->d_inode; | |
1509 | int error = -EACCES; | |
1510 | ||
1511 | /* We don't need a base pointer in the /proc filesystem */ | |
1d957f9b | 1512 | path_put(&nd->path); |
1da177e4 | 1513 | |
778c1144 EB |
1514 | /* Are we allowed to snoop on the tasks file descriptors? */ |
1515 | if (!proc_fd_access_allowed(inode)) | |
1da177e4 | 1516 | goto out; |
1da177e4 | 1517 | |
3dcd25f3 | 1518 | error = PROC_I(inode)->op.proc_get_link(inode, &nd->path); |
1da177e4 | 1519 | out: |
008b150a | 1520 | return ERR_PTR(error); |
1da177e4 LT |
1521 | } |
1522 | ||
3dcd25f3 | 1523 | static int do_proc_readlink(struct path *path, char __user *buffer, int buflen) |
1da177e4 | 1524 | { |
e12ba74d | 1525 | char *tmp = (char*)__get_free_page(GFP_TEMPORARY); |
3dcd25f3 | 1526 | char *pathname; |
1da177e4 LT |
1527 | int len; |
1528 | ||
1529 | if (!tmp) | |
1530 | return -ENOMEM; | |
0c28f287 | 1531 | |
8df9d1a4 | 1532 | pathname = d_path_with_unreachable(path, tmp, PAGE_SIZE); |
3dcd25f3 JB |
1533 | len = PTR_ERR(pathname); |
1534 | if (IS_ERR(pathname)) | |
1da177e4 | 1535 | goto out; |
3dcd25f3 | 1536 | len = tmp + PAGE_SIZE - 1 - pathname; |
1da177e4 LT |
1537 | |
1538 | if (len > buflen) | |
1539 | len = buflen; | |
3dcd25f3 | 1540 | if (copy_to_user(buffer, pathname, len)) |
1da177e4 LT |
1541 | len = -EFAULT; |
1542 | out: | |
1543 | free_page((unsigned long)tmp); | |
1544 | return len; | |
1545 | } | |
1546 | ||
1547 | static int proc_pid_readlink(struct dentry * dentry, char __user * buffer, int buflen) | |
1548 | { | |
1549 | int error = -EACCES; | |
1550 | struct inode *inode = dentry->d_inode; | |
3dcd25f3 | 1551 | struct path path; |
1da177e4 | 1552 | |
778c1144 EB |
1553 | /* Are we allowed to snoop on the tasks file descriptors? */ |
1554 | if (!proc_fd_access_allowed(inode)) | |
1da177e4 | 1555 | goto out; |
1da177e4 | 1556 | |
3dcd25f3 | 1557 | error = PROC_I(inode)->op.proc_get_link(inode, &path); |
1da177e4 LT |
1558 | if (error) |
1559 | goto out; | |
1560 | ||
3dcd25f3 JB |
1561 | error = do_proc_readlink(&path, buffer, buflen); |
1562 | path_put(&path); | |
1da177e4 | 1563 | out: |
1da177e4 LT |
1564 | return error; |
1565 | } | |
1566 | ||
c5ef1c42 | 1567 | static const struct inode_operations proc_pid_link_inode_operations = { |
1da177e4 | 1568 | .readlink = proc_pid_readlink, |
6d76fa58 LT |
1569 | .follow_link = proc_pid_follow_link, |
1570 | .setattr = proc_setattr, | |
1da177e4 LT |
1571 | }; |
1572 | ||
28a6d671 EB |
1573 | |
1574 | /* building an inode */ | |
1575 | ||
1576 | static int task_dumpable(struct task_struct *task) | |
1da177e4 | 1577 | { |
28a6d671 EB |
1578 | int dumpable = 0; |
1579 | struct mm_struct *mm; | |
1da177e4 | 1580 | |
28a6d671 EB |
1581 | task_lock(task); |
1582 | mm = task->mm; | |
1583 | if (mm) | |
6c5d5238 | 1584 | dumpable = get_dumpable(mm); |
28a6d671 EB |
1585 | task_unlock(task); |
1586 | if(dumpable == 1) | |
1587 | return 1; | |
1588 | return 0; | |
1589 | } | |
1da177e4 | 1590 | |
1da177e4 | 1591 | |
61a28784 | 1592 | static struct inode *proc_pid_make_inode(struct super_block * sb, struct task_struct *task) |
28a6d671 EB |
1593 | { |
1594 | struct inode * inode; | |
1595 | struct proc_inode *ei; | |
c69e8d9c | 1596 | const struct cred *cred; |
1da177e4 | 1597 | |
28a6d671 | 1598 | /* We need a new inode */ |
1da177e4 | 1599 | |
28a6d671 EB |
1600 | inode = new_inode(sb); |
1601 | if (!inode) | |
1602 | goto out; | |
1603 | ||
1604 | /* Common stuff */ | |
1605 | ei = PROC_I(inode); | |
1606 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; | |
28a6d671 EB |
1607 | inode->i_op = &proc_def_inode_operations; |
1608 | ||
1609 | /* | |
1610 | * grab the reference to task. | |
1611 | */ | |
1a657f78 | 1612 | ei->pid = get_task_pid(task, PIDTYPE_PID); |
28a6d671 EB |
1613 | if (!ei->pid) |
1614 | goto out_unlock; | |
1615 | ||
28a6d671 | 1616 | if (task_dumpable(task)) { |
c69e8d9c DH |
1617 | rcu_read_lock(); |
1618 | cred = __task_cred(task); | |
1619 | inode->i_uid = cred->euid; | |
1620 | inode->i_gid = cred->egid; | |
1621 | rcu_read_unlock(); | |
1da177e4 | 1622 | } |
28a6d671 EB |
1623 | security_task_to_inode(task, inode); |
1624 | ||
1da177e4 | 1625 | out: |
28a6d671 EB |
1626 | return inode; |
1627 | ||
1628 | out_unlock: | |
1629 | iput(inode); | |
1630 | return NULL; | |
1da177e4 LT |
1631 | } |
1632 | ||
28a6d671 | 1633 | static int pid_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) |
1da177e4 | 1634 | { |
1da177e4 | 1635 | struct inode *inode = dentry->d_inode; |
28a6d671 | 1636 | struct task_struct *task; |
c69e8d9c DH |
1637 | const struct cred *cred; |
1638 | ||
28a6d671 | 1639 | generic_fillattr(inode, stat); |
1da177e4 | 1640 | |
28a6d671 EB |
1641 | rcu_read_lock(); |
1642 | stat->uid = 0; | |
1643 | stat->gid = 0; | |
1644 | task = pid_task(proc_pid(inode), PIDTYPE_PID); | |
1645 | if (task) { | |
1646 | if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) || | |
1647 | task_dumpable(task)) { | |
c69e8d9c DH |
1648 | cred = __task_cred(task); |
1649 | stat->uid = cred->euid; | |
1650 | stat->gid = cred->egid; | |
1da177e4 LT |
1651 | } |
1652 | } | |
28a6d671 | 1653 | rcu_read_unlock(); |
d6e71144 | 1654 | return 0; |
1da177e4 LT |
1655 | } |
1656 | ||
1da177e4 LT |
1657 | /* dentry stuff */ |
1658 | ||
1659 | /* | |
1660 | * Exceptional case: normally we are not allowed to unhash a busy | |
1661 | * directory. In this case, however, we can do it - no aliasing problems | |
1662 | * due to the way we treat inodes. | |
1663 | * | |
1664 | * Rewrite the inode's ownerships here because the owning task may have | |
1665 | * performed a setuid(), etc. | |
99f89551 EB |
1666 | * |
1667 | * Before the /proc/pid/status file was created the only way to read | |
1668 | * the effective uid of a /process was to stat /proc/pid. Reading | |
1669 | * /proc/pid/status is slow enough that procps and other packages | |
1670 | * kept stating /proc/pid. To keep the rules in /proc simple I have | |
1671 | * made this apply to all per process world readable and executable | |
1672 | * directories. | |
1da177e4 LT |
1673 | */ |
1674 | static int pid_revalidate(struct dentry *dentry, struct nameidata *nd) | |
1675 | { | |
1676 | struct inode *inode = dentry->d_inode; | |
99f89551 | 1677 | struct task_struct *task = get_proc_task(inode); |
c69e8d9c DH |
1678 | const struct cred *cred; |
1679 | ||
99f89551 EB |
1680 | if (task) { |
1681 | if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) || | |
1682 | task_dumpable(task)) { | |
c69e8d9c DH |
1683 | rcu_read_lock(); |
1684 | cred = __task_cred(task); | |
1685 | inode->i_uid = cred->euid; | |
1686 | inode->i_gid = cred->egid; | |
1687 | rcu_read_unlock(); | |
1da177e4 LT |
1688 | } else { |
1689 | inode->i_uid = 0; | |
1690 | inode->i_gid = 0; | |
1691 | } | |
9ee8ab9f | 1692 | inode->i_mode &= ~(S_ISUID | S_ISGID); |
1da177e4 | 1693 | security_task_to_inode(task, inode); |
99f89551 | 1694 | put_task_struct(task); |
1da177e4 LT |
1695 | return 1; |
1696 | } | |
1697 | d_drop(dentry); | |
1698 | return 0; | |
1699 | } | |
1700 | ||
28a6d671 | 1701 | static int pid_delete_dentry(struct dentry * dentry) |
99f89551 | 1702 | { |
28a6d671 EB |
1703 | /* Is the task we represent dead? |
1704 | * If so, then don't put the dentry on the lru list, | |
1705 | * kill it immediately. | |
1706 | */ | |
1707 | return !proc_pid(dentry->d_inode)->tasks[PIDTYPE_PID].first; | |
1708 | } | |
1709 | ||
d72f71eb | 1710 | static const struct dentry_operations pid_dentry_operations = |
28a6d671 EB |
1711 | { |
1712 | .d_revalidate = pid_revalidate, | |
1713 | .d_delete = pid_delete_dentry, | |
1714 | }; | |
1715 | ||
1716 | /* Lookups */ | |
1717 | ||
c5141e6d ED |
1718 | typedef struct dentry *instantiate_t(struct inode *, struct dentry *, |
1719 | struct task_struct *, const void *); | |
61a28784 | 1720 | |
1c0d04c9 EB |
1721 | /* |
1722 | * Fill a directory entry. | |
1723 | * | |
1724 | * If possible create the dcache entry and derive our inode number and | |
1725 | * file type from dcache entry. | |
1726 | * | |
1727 | * Since all of the proc inode numbers are dynamically generated, the inode | |
1728 | * numbers do not exist until the inode is cache. This means creating the | |
1729 | * the dcache entry in readdir is necessary to keep the inode numbers | |
1730 | * reported by readdir in sync with the inode numbers reported | |
1731 | * by stat. | |
1732 | */ | |
61a28784 EB |
1733 | static int proc_fill_cache(struct file *filp, void *dirent, filldir_t filldir, |
1734 | char *name, int len, | |
c5141e6d | 1735 | instantiate_t instantiate, struct task_struct *task, const void *ptr) |
61a28784 | 1736 | { |
2fddfeef | 1737 | struct dentry *child, *dir = filp->f_path.dentry; |
61a28784 EB |
1738 | struct inode *inode; |
1739 | struct qstr qname; | |
1740 | ino_t ino = 0; | |
1741 | unsigned type = DT_UNKNOWN; | |
1742 | ||
1743 | qname.name = name; | |
1744 | qname.len = len; | |
1745 | qname.hash = full_name_hash(name, len); | |
1746 | ||
1747 | child = d_lookup(dir, &qname); | |
1748 | if (!child) { | |
1749 | struct dentry *new; | |
1750 | new = d_alloc(dir, &qname); | |
1751 | if (new) { | |
1752 | child = instantiate(dir->d_inode, new, task, ptr); | |
1753 | if (child) | |
1754 | dput(new); | |
1755 | else | |
1756 | child = new; | |
1757 | } | |
1758 | } | |
1759 | if (!child || IS_ERR(child) || !child->d_inode) | |
1760 | goto end_instantiate; | |
1761 | inode = child->d_inode; | |
1762 | if (inode) { | |
1763 | ino = inode->i_ino; | |
1764 | type = inode->i_mode >> 12; | |
1765 | } | |
1766 | dput(child); | |
1767 | end_instantiate: | |
1768 | if (!ino) | |
1769 | ino = find_inode_number(dir, &qname); | |
1770 | if (!ino) | |
1771 | ino = 1; | |
1772 | return filldir(dirent, name, len, filp->f_pos, ino, type); | |
1773 | } | |
1774 | ||
28a6d671 EB |
1775 | static unsigned name_to_int(struct dentry *dentry) |
1776 | { | |
1777 | const char *name = dentry->d_name.name; | |
1778 | int len = dentry->d_name.len; | |
1779 | unsigned n = 0; | |
1780 | ||
1781 | if (len > 1 && *name == '0') | |
1782 | goto out; | |
1783 | while (len-- > 0) { | |
1784 | unsigned c = *name++ - '0'; | |
1785 | if (c > 9) | |
1786 | goto out; | |
1787 | if (n >= (~0U-9)/10) | |
1788 | goto out; | |
1789 | n *= 10; | |
1790 | n += c; | |
1791 | } | |
1792 | return n; | |
1793 | out: | |
1794 | return ~0U; | |
1795 | } | |
1796 | ||
27932742 MS |
1797 | #define PROC_FDINFO_MAX 64 |
1798 | ||
3dcd25f3 | 1799 | static int proc_fd_info(struct inode *inode, struct path *path, char *info) |
28a6d671 EB |
1800 | { |
1801 | struct task_struct *task = get_proc_task(inode); | |
1802 | struct files_struct *files = NULL; | |
1803 | struct file *file; | |
1804 | int fd = proc_fd(inode); | |
99f89551 | 1805 | |
99f89551 | 1806 | if (task) { |
28a6d671 EB |
1807 | files = get_files_struct(task); |
1808 | put_task_struct(task); | |
1809 | } | |
1810 | if (files) { | |
1811 | /* | |
1812 | * We are not taking a ref to the file structure, so we must | |
1813 | * hold ->file_lock. | |
1814 | */ | |
1815 | spin_lock(&files->file_lock); | |
1816 | file = fcheck_files(files, fd); | |
1817 | if (file) { | |
3dcd25f3 JB |
1818 | if (path) { |
1819 | *path = file->f_path; | |
1820 | path_get(&file->f_path); | |
1821 | } | |
27932742 MS |
1822 | if (info) |
1823 | snprintf(info, PROC_FDINFO_MAX, | |
1824 | "pos:\t%lli\n" | |
1825 | "flags:\t0%o\n", | |
1826 | (long long) file->f_pos, | |
1827 | file->f_flags); | |
28a6d671 EB |
1828 | spin_unlock(&files->file_lock); |
1829 | put_files_struct(files); | |
1830 | return 0; | |
99f89551 | 1831 | } |
28a6d671 EB |
1832 | spin_unlock(&files->file_lock); |
1833 | put_files_struct(files); | |
99f89551 | 1834 | } |
28a6d671 | 1835 | return -ENOENT; |
99f89551 EB |
1836 | } |
1837 | ||
3dcd25f3 | 1838 | static int proc_fd_link(struct inode *inode, struct path *path) |
27932742 | 1839 | { |
3dcd25f3 | 1840 | return proc_fd_info(inode, path, NULL); |
27932742 MS |
1841 | } |
1842 | ||
1da177e4 LT |
1843 | static int tid_fd_revalidate(struct dentry *dentry, struct nameidata *nd) |
1844 | { | |
1845 | struct inode *inode = dentry->d_inode; | |
99f89551 | 1846 | struct task_struct *task = get_proc_task(inode); |
aed7a6c4 | 1847 | int fd = proc_fd(inode); |
1da177e4 | 1848 | struct files_struct *files; |
c69e8d9c | 1849 | const struct cred *cred; |
1da177e4 | 1850 | |
99f89551 EB |
1851 | if (task) { |
1852 | files = get_files_struct(task); | |
1853 | if (files) { | |
1854 | rcu_read_lock(); | |
1855 | if (fcheck_files(files, fd)) { | |
1856 | rcu_read_unlock(); | |
1857 | put_files_struct(files); | |
1858 | if (task_dumpable(task)) { | |
c69e8d9c DH |
1859 | rcu_read_lock(); |
1860 | cred = __task_cred(task); | |
1861 | inode->i_uid = cred->euid; | |
1862 | inode->i_gid = cred->egid; | |
1863 | rcu_read_unlock(); | |
99f89551 EB |
1864 | } else { |
1865 | inode->i_uid = 0; | |
1866 | inode->i_gid = 0; | |
1867 | } | |
9ee8ab9f | 1868 | inode->i_mode &= ~(S_ISUID | S_ISGID); |
99f89551 EB |
1869 | security_task_to_inode(task, inode); |
1870 | put_task_struct(task); | |
1871 | return 1; | |
1872 | } | |
b835996f | 1873 | rcu_read_unlock(); |
1da177e4 | 1874 | put_files_struct(files); |
1da177e4 | 1875 | } |
99f89551 | 1876 | put_task_struct(task); |
1da177e4 LT |
1877 | } |
1878 | d_drop(dentry); | |
1879 | return 0; | |
1880 | } | |
1881 | ||
d72f71eb | 1882 | static const struct dentry_operations tid_fd_dentry_operations = |
1da177e4 LT |
1883 | { |
1884 | .d_revalidate = tid_fd_revalidate, | |
1885 | .d_delete = pid_delete_dentry, | |
1886 | }; | |
1887 | ||
444ceed8 | 1888 | static struct dentry *proc_fd_instantiate(struct inode *dir, |
c5141e6d | 1889 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
1da177e4 | 1890 | { |
c5141e6d | 1891 | unsigned fd = *(const unsigned *)ptr; |
444ceed8 EB |
1892 | struct file *file; |
1893 | struct files_struct *files; | |
1894 | struct inode *inode; | |
1895 | struct proc_inode *ei; | |
1896 | struct dentry *error = ERR_PTR(-ENOENT); | |
1da177e4 | 1897 | |
61a28784 | 1898 | inode = proc_pid_make_inode(dir->i_sb, task); |
1da177e4 LT |
1899 | if (!inode) |
1900 | goto out; | |
1901 | ei = PROC_I(inode); | |
aed7a6c4 | 1902 | ei->fd = fd; |
1da177e4 LT |
1903 | files = get_files_struct(task); |
1904 | if (!files) | |
444ceed8 | 1905 | goto out_iput; |
1da177e4 | 1906 | inode->i_mode = S_IFLNK; |
ca99c1da DS |
1907 | |
1908 | /* | |
1909 | * We are not taking a ref to the file structure, so we must | |
1910 | * hold ->file_lock. | |
1911 | */ | |
1912 | spin_lock(&files->file_lock); | |
1da177e4 LT |
1913 | file = fcheck_files(files, fd); |
1914 | if (!file) | |
444ceed8 | 1915 | goto out_unlock; |
aeb5d727 | 1916 | if (file->f_mode & FMODE_READ) |
1da177e4 | 1917 | inode->i_mode |= S_IRUSR | S_IXUSR; |
aeb5d727 | 1918 | if (file->f_mode & FMODE_WRITE) |
1da177e4 | 1919 | inode->i_mode |= S_IWUSR | S_IXUSR; |
ca99c1da | 1920 | spin_unlock(&files->file_lock); |
1da177e4 | 1921 | put_files_struct(files); |
444ceed8 | 1922 | |
1da177e4 LT |
1923 | inode->i_op = &proc_pid_link_inode_operations; |
1924 | inode->i_size = 64; | |
1925 | ei->op.proc_get_link = proc_fd_link; | |
1926 | dentry->d_op = &tid_fd_dentry_operations; | |
1927 | d_add(dentry, inode); | |
cd6a3ce9 EB |
1928 | /* Close the race of the process dying before we return the dentry */ |
1929 | if (tid_fd_revalidate(dentry, NULL)) | |
444ceed8 | 1930 | error = NULL; |
1da177e4 | 1931 | |
444ceed8 EB |
1932 | out: |
1933 | return error; | |
1934 | out_unlock: | |
ca99c1da | 1935 | spin_unlock(&files->file_lock); |
1da177e4 | 1936 | put_files_struct(files); |
444ceed8 | 1937 | out_iput: |
1da177e4 | 1938 | iput(inode); |
cd6a3ce9 | 1939 | goto out; |
1da177e4 LT |
1940 | } |
1941 | ||
27932742 MS |
1942 | static struct dentry *proc_lookupfd_common(struct inode *dir, |
1943 | struct dentry *dentry, | |
1944 | instantiate_t instantiate) | |
444ceed8 EB |
1945 | { |
1946 | struct task_struct *task = get_proc_task(dir); | |
1947 | unsigned fd = name_to_int(dentry); | |
1948 | struct dentry *result = ERR_PTR(-ENOENT); | |
1949 | ||
1950 | if (!task) | |
1951 | goto out_no_task; | |
1952 | if (fd == ~0U) | |
1953 | goto out; | |
1954 | ||
27932742 | 1955 | result = instantiate(dir, dentry, task, &fd); |
444ceed8 EB |
1956 | out: |
1957 | put_task_struct(task); | |
1958 | out_no_task: | |
1959 | return result; | |
1960 | } | |
1961 | ||
27932742 MS |
1962 | static int proc_readfd_common(struct file * filp, void * dirent, |
1963 | filldir_t filldir, instantiate_t instantiate) | |
28a6d671 | 1964 | { |
2fddfeef | 1965 | struct dentry *dentry = filp->f_path.dentry; |
28a6d671 EB |
1966 | struct inode *inode = dentry->d_inode; |
1967 | struct task_struct *p = get_proc_task(inode); | |
457c2510 | 1968 | unsigned int fd, ino; |
28a6d671 | 1969 | int retval; |
28a6d671 | 1970 | struct files_struct * files; |
1da177e4 | 1971 | |
28a6d671 EB |
1972 | retval = -ENOENT; |
1973 | if (!p) | |
1974 | goto out_no_task; | |
1975 | retval = 0; | |
28a6d671 EB |
1976 | |
1977 | fd = filp->f_pos; | |
1978 | switch (fd) { | |
1979 | case 0: | |
1980 | if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0) | |
1981 | goto out; | |
1982 | filp->f_pos++; | |
1983 | case 1: | |
1984 | ino = parent_ino(dentry); | |
1985 | if (filldir(dirent, "..", 2, 1, ino, DT_DIR) < 0) | |
1986 | goto out; | |
1987 | filp->f_pos++; | |
1988 | default: | |
1989 | files = get_files_struct(p); | |
1990 | if (!files) | |
1991 | goto out; | |
1992 | rcu_read_lock(); | |
28a6d671 | 1993 | for (fd = filp->f_pos-2; |
9b4f526c | 1994 | fd < files_fdtable(files)->max_fds; |
28a6d671 | 1995 | fd++, filp->f_pos++) { |
27932742 MS |
1996 | char name[PROC_NUMBUF]; |
1997 | int len; | |
28a6d671 EB |
1998 | |
1999 | if (!fcheck_files(files, fd)) | |
2000 | continue; | |
2001 | rcu_read_unlock(); | |
2002 | ||
27932742 MS |
2003 | len = snprintf(name, sizeof(name), "%d", fd); |
2004 | if (proc_fill_cache(filp, dirent, filldir, | |
2005 | name, len, instantiate, | |
2006 | p, &fd) < 0) { | |
28a6d671 EB |
2007 | rcu_read_lock(); |
2008 | break; | |
2009 | } | |
2010 | rcu_read_lock(); | |
2011 | } | |
2012 | rcu_read_unlock(); | |
2013 | put_files_struct(files); | |
2014 | } | |
2015 | out: | |
2016 | put_task_struct(p); | |
2017 | out_no_task: | |
2018 | return retval; | |
2019 | } | |
2020 | ||
27932742 MS |
2021 | static struct dentry *proc_lookupfd(struct inode *dir, struct dentry *dentry, |
2022 | struct nameidata *nd) | |
2023 | { | |
2024 | return proc_lookupfd_common(dir, dentry, proc_fd_instantiate); | |
2025 | } | |
2026 | ||
2027 | static int proc_readfd(struct file *filp, void *dirent, filldir_t filldir) | |
2028 | { | |
2029 | return proc_readfd_common(filp, dirent, filldir, proc_fd_instantiate); | |
2030 | } | |
2031 | ||
2032 | static ssize_t proc_fdinfo_read(struct file *file, char __user *buf, | |
2033 | size_t len, loff_t *ppos) | |
2034 | { | |
2035 | char tmp[PROC_FDINFO_MAX]; | |
3dcd25f3 | 2036 | int err = proc_fd_info(file->f_path.dentry->d_inode, NULL, tmp); |
27932742 MS |
2037 | if (!err) |
2038 | err = simple_read_from_buffer(buf, len, ppos, tmp, strlen(tmp)); | |
2039 | return err; | |
2040 | } | |
2041 | ||
2042 | static const struct file_operations proc_fdinfo_file_operations = { | |
87df8424 | 2043 | .open = nonseekable_open, |
27932742 | 2044 | .read = proc_fdinfo_read, |
6038f373 | 2045 | .llseek = no_llseek, |
27932742 MS |
2046 | }; |
2047 | ||
00977a59 | 2048 | static const struct file_operations proc_fd_operations = { |
28a6d671 EB |
2049 | .read = generic_read_dir, |
2050 | .readdir = proc_readfd, | |
6038f373 | 2051 | .llseek = default_llseek, |
1da177e4 LT |
2052 | }; |
2053 | ||
8948e11f AD |
2054 | /* |
2055 | * /proc/pid/fd needs a special permission handler so that a process can still | |
2056 | * access /proc/self/fd after it has executed a setuid(). | |
2057 | */ | |
e6305c43 | 2058 | static int proc_fd_permission(struct inode *inode, int mask) |
8948e11f AD |
2059 | { |
2060 | int rv; | |
2061 | ||
2062 | rv = generic_permission(inode, mask, NULL); | |
2063 | if (rv == 0) | |
2064 | return 0; | |
2065 | if (task_pid(current) == proc_pid(inode)) | |
2066 | rv = 0; | |
2067 | return rv; | |
2068 | } | |
2069 | ||
1da177e4 LT |
2070 | /* |
2071 | * proc directories can do almost nothing.. | |
2072 | */ | |
c5ef1c42 | 2073 | static const struct inode_operations proc_fd_inode_operations = { |
1da177e4 | 2074 | .lookup = proc_lookupfd, |
8948e11f | 2075 | .permission = proc_fd_permission, |
6d76fa58 | 2076 | .setattr = proc_setattr, |
1da177e4 LT |
2077 | }; |
2078 | ||
27932742 MS |
2079 | static struct dentry *proc_fdinfo_instantiate(struct inode *dir, |
2080 | struct dentry *dentry, struct task_struct *task, const void *ptr) | |
2081 | { | |
2082 | unsigned fd = *(unsigned *)ptr; | |
2083 | struct inode *inode; | |
2084 | struct proc_inode *ei; | |
2085 | struct dentry *error = ERR_PTR(-ENOENT); | |
2086 | ||
2087 | inode = proc_pid_make_inode(dir->i_sb, task); | |
2088 | if (!inode) | |
2089 | goto out; | |
2090 | ei = PROC_I(inode); | |
2091 | ei->fd = fd; | |
2092 | inode->i_mode = S_IFREG | S_IRUSR; | |
2093 | inode->i_fop = &proc_fdinfo_file_operations; | |
2094 | dentry->d_op = &tid_fd_dentry_operations; | |
2095 | d_add(dentry, inode); | |
2096 | /* Close the race of the process dying before we return the dentry */ | |
2097 | if (tid_fd_revalidate(dentry, NULL)) | |
2098 | error = NULL; | |
2099 | ||
2100 | out: | |
2101 | return error; | |
2102 | } | |
2103 | ||
2104 | static struct dentry *proc_lookupfdinfo(struct inode *dir, | |
2105 | struct dentry *dentry, | |
2106 | struct nameidata *nd) | |
2107 | { | |
2108 | return proc_lookupfd_common(dir, dentry, proc_fdinfo_instantiate); | |
2109 | } | |
2110 | ||
2111 | static int proc_readfdinfo(struct file *filp, void *dirent, filldir_t filldir) | |
2112 | { | |
2113 | return proc_readfd_common(filp, dirent, filldir, | |
2114 | proc_fdinfo_instantiate); | |
2115 | } | |
2116 | ||
2117 | static const struct file_operations proc_fdinfo_operations = { | |
2118 | .read = generic_read_dir, | |
2119 | .readdir = proc_readfdinfo, | |
6038f373 | 2120 | .llseek = default_llseek, |
27932742 MS |
2121 | }; |
2122 | ||
2123 | /* | |
2124 | * proc directories can do almost nothing.. | |
2125 | */ | |
2126 | static const struct inode_operations proc_fdinfo_inode_operations = { | |
2127 | .lookup = proc_lookupfdinfo, | |
2128 | .setattr = proc_setattr, | |
2129 | }; | |
2130 | ||
2131 | ||
444ceed8 | 2132 | static struct dentry *proc_pident_instantiate(struct inode *dir, |
c5141e6d | 2133 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
444ceed8 | 2134 | { |
c5141e6d | 2135 | const struct pid_entry *p = ptr; |
444ceed8 EB |
2136 | struct inode *inode; |
2137 | struct proc_inode *ei; | |
bd6daba9 | 2138 | struct dentry *error = ERR_PTR(-ENOENT); |
444ceed8 | 2139 | |
61a28784 | 2140 | inode = proc_pid_make_inode(dir->i_sb, task); |
444ceed8 EB |
2141 | if (!inode) |
2142 | goto out; | |
2143 | ||
2144 | ei = PROC_I(inode); | |
2145 | inode->i_mode = p->mode; | |
2146 | if (S_ISDIR(inode->i_mode)) | |
2147 | inode->i_nlink = 2; /* Use getattr to fix if necessary */ | |
2148 | if (p->iop) | |
2149 | inode->i_op = p->iop; | |
2150 | if (p->fop) | |
2151 | inode->i_fop = p->fop; | |
2152 | ei->op = p->op; | |
2153 | dentry->d_op = &pid_dentry_operations; | |
2154 | d_add(dentry, inode); | |
2155 | /* Close the race of the process dying before we return the dentry */ | |
2156 | if (pid_revalidate(dentry, NULL)) | |
2157 | error = NULL; | |
2158 | out: | |
2159 | return error; | |
2160 | } | |
2161 | ||
1da177e4 LT |
2162 | static struct dentry *proc_pident_lookup(struct inode *dir, |
2163 | struct dentry *dentry, | |
c5141e6d | 2164 | const struct pid_entry *ents, |
7bcd6b0e | 2165 | unsigned int nents) |
1da177e4 | 2166 | { |
cd6a3ce9 | 2167 | struct dentry *error; |
99f89551 | 2168 | struct task_struct *task = get_proc_task(dir); |
c5141e6d | 2169 | const struct pid_entry *p, *last; |
1da177e4 | 2170 | |
cd6a3ce9 | 2171 | error = ERR_PTR(-ENOENT); |
1da177e4 | 2172 | |
99f89551 EB |
2173 | if (!task) |
2174 | goto out_no_task; | |
1da177e4 | 2175 | |
20cdc894 EB |
2176 | /* |
2177 | * Yes, it does not scale. And it should not. Don't add | |
2178 | * new entries into /proc/<tgid>/ without very good reasons. | |
2179 | */ | |
7bcd6b0e EB |
2180 | last = &ents[nents - 1]; |
2181 | for (p = ents; p <= last; p++) { | |
1da177e4 LT |
2182 | if (p->len != dentry->d_name.len) |
2183 | continue; | |
2184 | if (!memcmp(dentry->d_name.name, p->name, p->len)) | |
2185 | break; | |
2186 | } | |
7bcd6b0e | 2187 | if (p > last) |
1da177e4 LT |
2188 | goto out; |
2189 | ||
444ceed8 | 2190 | error = proc_pident_instantiate(dir, dentry, task, p); |
1da177e4 | 2191 | out: |
99f89551 EB |
2192 | put_task_struct(task); |
2193 | out_no_task: | |
cd6a3ce9 | 2194 | return error; |
1da177e4 LT |
2195 | } |
2196 | ||
c5141e6d ED |
2197 | static int proc_pident_fill_cache(struct file *filp, void *dirent, |
2198 | filldir_t filldir, struct task_struct *task, const struct pid_entry *p) | |
61a28784 EB |
2199 | { |
2200 | return proc_fill_cache(filp, dirent, filldir, p->name, p->len, | |
2201 | proc_pident_instantiate, task, p); | |
2202 | } | |
2203 | ||
28a6d671 EB |
2204 | static int proc_pident_readdir(struct file *filp, |
2205 | void *dirent, filldir_t filldir, | |
c5141e6d | 2206 | const struct pid_entry *ents, unsigned int nents) |
28a6d671 EB |
2207 | { |
2208 | int i; | |
2fddfeef | 2209 | struct dentry *dentry = filp->f_path.dentry; |
28a6d671 EB |
2210 | struct inode *inode = dentry->d_inode; |
2211 | struct task_struct *task = get_proc_task(inode); | |
c5141e6d | 2212 | const struct pid_entry *p, *last; |
28a6d671 EB |
2213 | ino_t ino; |
2214 | int ret; | |
2215 | ||
2216 | ret = -ENOENT; | |
2217 | if (!task) | |
61a28784 | 2218 | goto out_no_task; |
28a6d671 EB |
2219 | |
2220 | ret = 0; | |
28a6d671 EB |
2221 | i = filp->f_pos; |
2222 | switch (i) { | |
2223 | case 0: | |
2224 | ino = inode->i_ino; | |
2225 | if (filldir(dirent, ".", 1, i, ino, DT_DIR) < 0) | |
2226 | goto out; | |
2227 | i++; | |
2228 | filp->f_pos++; | |
2229 | /* fall through */ | |
2230 | case 1: | |
2231 | ino = parent_ino(dentry); | |
2232 | if (filldir(dirent, "..", 2, i, ino, DT_DIR) < 0) | |
2233 | goto out; | |
2234 | i++; | |
2235 | filp->f_pos++; | |
2236 | /* fall through */ | |
2237 | default: | |
2238 | i -= 2; | |
2239 | if (i >= nents) { | |
2240 | ret = 1; | |
2241 | goto out; | |
2242 | } | |
2243 | p = ents + i; | |
7bcd6b0e EB |
2244 | last = &ents[nents - 1]; |
2245 | while (p <= last) { | |
61a28784 | 2246 | if (proc_pident_fill_cache(filp, dirent, filldir, task, p) < 0) |
28a6d671 EB |
2247 | goto out; |
2248 | filp->f_pos++; | |
2249 | p++; | |
2250 | } | |
2251 | } | |
2252 | ||
2253 | ret = 1; | |
2254 | out: | |
61a28784 EB |
2255 | put_task_struct(task); |
2256 | out_no_task: | |
28a6d671 | 2257 | return ret; |
1da177e4 LT |
2258 | } |
2259 | ||
28a6d671 EB |
2260 | #ifdef CONFIG_SECURITY |
2261 | static ssize_t proc_pid_attr_read(struct file * file, char __user * buf, | |
2262 | size_t count, loff_t *ppos) | |
2263 | { | |
2fddfeef | 2264 | struct inode * inode = file->f_path.dentry->d_inode; |
04ff9708 | 2265 | char *p = NULL; |
28a6d671 EB |
2266 | ssize_t length; |
2267 | struct task_struct *task = get_proc_task(inode); | |
2268 | ||
28a6d671 | 2269 | if (!task) |
04ff9708 | 2270 | return -ESRCH; |
28a6d671 EB |
2271 | |
2272 | length = security_getprocattr(task, | |
2fddfeef | 2273 | (char*)file->f_path.dentry->d_name.name, |
04ff9708 | 2274 | &p); |
28a6d671 | 2275 | put_task_struct(task); |
04ff9708 AV |
2276 | if (length > 0) |
2277 | length = simple_read_from_buffer(buf, count, ppos, p, length); | |
2278 | kfree(p); | |
28a6d671 | 2279 | return length; |
1da177e4 LT |
2280 | } |
2281 | ||
28a6d671 EB |
2282 | static ssize_t proc_pid_attr_write(struct file * file, const char __user * buf, |
2283 | size_t count, loff_t *ppos) | |
2284 | { | |
2fddfeef | 2285 | struct inode * inode = file->f_path.dentry->d_inode; |
28a6d671 EB |
2286 | char *page; |
2287 | ssize_t length; | |
2288 | struct task_struct *task = get_proc_task(inode); | |
2289 | ||
2290 | length = -ESRCH; | |
2291 | if (!task) | |
2292 | goto out_no_task; | |
2293 | if (count > PAGE_SIZE) | |
2294 | count = PAGE_SIZE; | |
2295 | ||
2296 | /* No partial writes. */ | |
2297 | length = -EINVAL; | |
2298 | if (*ppos != 0) | |
2299 | goto out; | |
2300 | ||
2301 | length = -ENOMEM; | |
e12ba74d | 2302 | page = (char*)__get_free_page(GFP_TEMPORARY); |
28a6d671 EB |
2303 | if (!page) |
2304 | goto out; | |
2305 | ||
2306 | length = -EFAULT; | |
2307 | if (copy_from_user(page, buf, count)) | |
2308 | goto out_free; | |
2309 | ||
107db7c7 DH |
2310 | /* Guard against adverse ptrace interaction */ |
2311 | length = mutex_lock_interruptible(&task->cred_guard_mutex); | |
2312 | if (length < 0) | |
2313 | goto out_free; | |
2314 | ||
28a6d671 | 2315 | length = security_setprocattr(task, |
2fddfeef | 2316 | (char*)file->f_path.dentry->d_name.name, |
28a6d671 | 2317 | (void*)page, count); |
107db7c7 | 2318 | mutex_unlock(&task->cred_guard_mutex); |
28a6d671 EB |
2319 | out_free: |
2320 | free_page((unsigned long) page); | |
2321 | out: | |
2322 | put_task_struct(task); | |
2323 | out_no_task: | |
2324 | return length; | |
2325 | } | |
2326 | ||
00977a59 | 2327 | static const struct file_operations proc_pid_attr_operations = { |
28a6d671 EB |
2328 | .read = proc_pid_attr_read, |
2329 | .write = proc_pid_attr_write, | |
87df8424 | 2330 | .llseek = generic_file_llseek, |
28a6d671 EB |
2331 | }; |
2332 | ||
c5141e6d | 2333 | static const struct pid_entry attr_dir_stuff[] = { |
631f9c18 AD |
2334 | REG("current", S_IRUGO|S_IWUGO, proc_pid_attr_operations), |
2335 | REG("prev", S_IRUGO, proc_pid_attr_operations), | |
2336 | REG("exec", S_IRUGO|S_IWUGO, proc_pid_attr_operations), | |
2337 | REG("fscreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations), | |
2338 | REG("keycreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations), | |
2339 | REG("sockcreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations), | |
28a6d671 EB |
2340 | }; |
2341 | ||
72d9dcfc | 2342 | static int proc_attr_dir_readdir(struct file * filp, |
28a6d671 EB |
2343 | void * dirent, filldir_t filldir) |
2344 | { | |
2345 | return proc_pident_readdir(filp,dirent,filldir, | |
72d9dcfc | 2346 | attr_dir_stuff,ARRAY_SIZE(attr_dir_stuff)); |
28a6d671 EB |
2347 | } |
2348 | ||
00977a59 | 2349 | static const struct file_operations proc_attr_dir_operations = { |
1da177e4 | 2350 | .read = generic_read_dir, |
72d9dcfc | 2351 | .readdir = proc_attr_dir_readdir, |
6038f373 | 2352 | .llseek = default_llseek, |
1da177e4 LT |
2353 | }; |
2354 | ||
72d9dcfc | 2355 | static struct dentry *proc_attr_dir_lookup(struct inode *dir, |
28a6d671 EB |
2356 | struct dentry *dentry, struct nameidata *nd) |
2357 | { | |
7bcd6b0e EB |
2358 | return proc_pident_lookup(dir, dentry, |
2359 | attr_dir_stuff, ARRAY_SIZE(attr_dir_stuff)); | |
28a6d671 EB |
2360 | } |
2361 | ||
c5ef1c42 | 2362 | static const struct inode_operations proc_attr_dir_inode_operations = { |
72d9dcfc | 2363 | .lookup = proc_attr_dir_lookup, |
99f89551 | 2364 | .getattr = pid_getattr, |
6d76fa58 | 2365 | .setattr = proc_setattr, |
1da177e4 LT |
2366 | }; |
2367 | ||
28a6d671 EB |
2368 | #endif |
2369 | ||
698ba7b5 | 2370 | #ifdef CONFIG_ELF_CORE |
3cb4a0bb KH |
2371 | static ssize_t proc_coredump_filter_read(struct file *file, char __user *buf, |
2372 | size_t count, loff_t *ppos) | |
2373 | { | |
2374 | struct task_struct *task = get_proc_task(file->f_dentry->d_inode); | |
2375 | struct mm_struct *mm; | |
2376 | char buffer[PROC_NUMBUF]; | |
2377 | size_t len; | |
2378 | int ret; | |
2379 | ||
2380 | if (!task) | |
2381 | return -ESRCH; | |
2382 | ||
2383 | ret = 0; | |
2384 | mm = get_task_mm(task); | |
2385 | if (mm) { | |
2386 | len = snprintf(buffer, sizeof(buffer), "%08lx\n", | |
2387 | ((mm->flags & MMF_DUMP_FILTER_MASK) >> | |
2388 | MMF_DUMP_FILTER_SHIFT)); | |
2389 | mmput(mm); | |
2390 | ret = simple_read_from_buffer(buf, count, ppos, buffer, len); | |
2391 | } | |
2392 | ||
2393 | put_task_struct(task); | |
2394 | ||
2395 | return ret; | |
2396 | } | |
2397 | ||
2398 | static ssize_t proc_coredump_filter_write(struct file *file, | |
2399 | const char __user *buf, | |
2400 | size_t count, | |
2401 | loff_t *ppos) | |
2402 | { | |
2403 | struct task_struct *task; | |
2404 | struct mm_struct *mm; | |
2405 | char buffer[PROC_NUMBUF], *end; | |
2406 | unsigned int val; | |
2407 | int ret; | |
2408 | int i; | |
2409 | unsigned long mask; | |
2410 | ||
2411 | ret = -EFAULT; | |
2412 | memset(buffer, 0, sizeof(buffer)); | |
2413 | if (count > sizeof(buffer) - 1) | |
2414 | count = sizeof(buffer) - 1; | |
2415 | if (copy_from_user(buffer, buf, count)) | |
2416 | goto out_no_task; | |
2417 | ||
2418 | ret = -EINVAL; | |
2419 | val = (unsigned int)simple_strtoul(buffer, &end, 0); | |
2420 | if (*end == '\n') | |
2421 | end++; | |
2422 | if (end - buffer == 0) | |
2423 | goto out_no_task; | |
2424 | ||
2425 | ret = -ESRCH; | |
2426 | task = get_proc_task(file->f_dentry->d_inode); | |
2427 | if (!task) | |
2428 | goto out_no_task; | |
2429 | ||
2430 | ret = end - buffer; | |
2431 | mm = get_task_mm(task); | |
2432 | if (!mm) | |
2433 | goto out_no_mm; | |
2434 | ||
2435 | for (i = 0, mask = 1; i < MMF_DUMP_FILTER_BITS; i++, mask <<= 1) { | |
2436 | if (val & mask) | |
2437 | set_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags); | |
2438 | else | |
2439 | clear_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags); | |
2440 | } | |
2441 | ||
2442 | mmput(mm); | |
2443 | out_no_mm: | |
2444 | put_task_struct(task); | |
2445 | out_no_task: | |
2446 | return ret; | |
2447 | } | |
2448 | ||
2449 | static const struct file_operations proc_coredump_filter_operations = { | |
2450 | .read = proc_coredump_filter_read, | |
2451 | .write = proc_coredump_filter_write, | |
87df8424 | 2452 | .llseek = generic_file_llseek, |
3cb4a0bb KH |
2453 | }; |
2454 | #endif | |
2455 | ||
28a6d671 EB |
2456 | /* |
2457 | * /proc/self: | |
2458 | */ | |
2459 | static int proc_self_readlink(struct dentry *dentry, char __user *buffer, | |
2460 | int buflen) | |
2461 | { | |
488e5bc4 | 2462 | struct pid_namespace *ns = dentry->d_sb->s_fs_info; |
b55fcb22 | 2463 | pid_t tgid = task_tgid_nr_ns(current, ns); |
28a6d671 | 2464 | char tmp[PROC_NUMBUF]; |
b55fcb22 | 2465 | if (!tgid) |
488e5bc4 | 2466 | return -ENOENT; |
b55fcb22 | 2467 | sprintf(tmp, "%d", tgid); |
28a6d671 EB |
2468 | return vfs_readlink(dentry,buffer,buflen,tmp); |
2469 | } | |
2470 | ||
2471 | static void *proc_self_follow_link(struct dentry *dentry, struct nameidata *nd) | |
2472 | { | |
488e5bc4 | 2473 | struct pid_namespace *ns = dentry->d_sb->s_fs_info; |
b55fcb22 | 2474 | pid_t tgid = task_tgid_nr_ns(current, ns); |
7fee4868 AV |
2475 | char *name = ERR_PTR(-ENOENT); |
2476 | if (tgid) { | |
2477 | name = __getname(); | |
2478 | if (!name) | |
2479 | name = ERR_PTR(-ENOMEM); | |
2480 | else | |
2481 | sprintf(name, "%d", tgid); | |
2482 | } | |
2483 | nd_set_link(nd, name); | |
2484 | return NULL; | |
2485 | } | |
2486 | ||
2487 | static void proc_self_put_link(struct dentry *dentry, struct nameidata *nd, | |
2488 | void *cookie) | |
2489 | { | |
2490 | char *s = nd_get_link(nd); | |
2491 | if (!IS_ERR(s)) | |
2492 | __putname(s); | |
28a6d671 EB |
2493 | } |
2494 | ||
c5ef1c42 | 2495 | static const struct inode_operations proc_self_inode_operations = { |
28a6d671 EB |
2496 | .readlink = proc_self_readlink, |
2497 | .follow_link = proc_self_follow_link, | |
7fee4868 | 2498 | .put_link = proc_self_put_link, |
28a6d671 EB |
2499 | }; |
2500 | ||
801199ce EB |
2501 | /* |
2502 | * proc base | |
2503 | * | |
2504 | * These are the directory entries in the root directory of /proc | |
2505 | * that properly belong to the /proc filesystem, as they describe | |
2506 | * describe something that is process related. | |
2507 | */ | |
c5141e6d | 2508 | static const struct pid_entry proc_base_stuff[] = { |
61a28784 | 2509 | NOD("self", S_IFLNK|S_IRWXUGO, |
801199ce | 2510 | &proc_self_inode_operations, NULL, {}), |
801199ce EB |
2511 | }; |
2512 | ||
2513 | /* | |
2514 | * Exceptional case: normally we are not allowed to unhash a busy | |
2515 | * directory. In this case, however, we can do it - no aliasing problems | |
2516 | * due to the way we treat inodes. | |
2517 | */ | |
2518 | static int proc_base_revalidate(struct dentry *dentry, struct nameidata *nd) | |
2519 | { | |
2520 | struct inode *inode = dentry->d_inode; | |
2521 | struct task_struct *task = get_proc_task(inode); | |
2522 | if (task) { | |
2523 | put_task_struct(task); | |
2524 | return 1; | |
2525 | } | |
2526 | d_drop(dentry); | |
2527 | return 0; | |
2528 | } | |
2529 | ||
d72f71eb | 2530 | static const struct dentry_operations proc_base_dentry_operations = |
801199ce EB |
2531 | { |
2532 | .d_revalidate = proc_base_revalidate, | |
2533 | .d_delete = pid_delete_dentry, | |
2534 | }; | |
2535 | ||
444ceed8 | 2536 | static struct dentry *proc_base_instantiate(struct inode *dir, |
c5141e6d | 2537 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
801199ce | 2538 | { |
c5141e6d | 2539 | const struct pid_entry *p = ptr; |
801199ce | 2540 | struct inode *inode; |
801199ce | 2541 | struct proc_inode *ei; |
73d36460 | 2542 | struct dentry *error; |
801199ce EB |
2543 | |
2544 | /* Allocate the inode */ | |
2545 | error = ERR_PTR(-ENOMEM); | |
2546 | inode = new_inode(dir->i_sb); | |
2547 | if (!inode) | |
2548 | goto out; | |
2549 | ||
2550 | /* Initialize the inode */ | |
2551 | ei = PROC_I(inode); | |
2552 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; | |
801199ce EB |
2553 | |
2554 | /* | |
2555 | * grab the reference to the task. | |
2556 | */ | |
1a657f78 | 2557 | ei->pid = get_task_pid(task, PIDTYPE_PID); |
801199ce EB |
2558 | if (!ei->pid) |
2559 | goto out_iput; | |
2560 | ||
801199ce EB |
2561 | inode->i_mode = p->mode; |
2562 | if (S_ISDIR(inode->i_mode)) | |
2563 | inode->i_nlink = 2; | |
2564 | if (S_ISLNK(inode->i_mode)) | |
2565 | inode->i_size = 64; | |
2566 | if (p->iop) | |
2567 | inode->i_op = p->iop; | |
2568 | if (p->fop) | |
2569 | inode->i_fop = p->fop; | |
2570 | ei->op = p->op; | |
2571 | dentry->d_op = &proc_base_dentry_operations; | |
2572 | d_add(dentry, inode); | |
2573 | error = NULL; | |
2574 | out: | |
801199ce EB |
2575 | return error; |
2576 | out_iput: | |
2577 | iput(inode); | |
2578 | goto out; | |
2579 | } | |
2580 | ||
444ceed8 EB |
2581 | static struct dentry *proc_base_lookup(struct inode *dir, struct dentry *dentry) |
2582 | { | |
2583 | struct dentry *error; | |
2584 | struct task_struct *task = get_proc_task(dir); | |
c5141e6d | 2585 | const struct pid_entry *p, *last; |
444ceed8 EB |
2586 | |
2587 | error = ERR_PTR(-ENOENT); | |
2588 | ||
2589 | if (!task) | |
2590 | goto out_no_task; | |
2591 | ||
2592 | /* Lookup the directory entry */ | |
7bcd6b0e EB |
2593 | last = &proc_base_stuff[ARRAY_SIZE(proc_base_stuff) - 1]; |
2594 | for (p = proc_base_stuff; p <= last; p++) { | |
444ceed8 EB |
2595 | if (p->len != dentry->d_name.len) |
2596 | continue; | |
2597 | if (!memcmp(dentry->d_name.name, p->name, p->len)) | |
2598 | break; | |
2599 | } | |
7bcd6b0e | 2600 | if (p > last) |
444ceed8 EB |
2601 | goto out; |
2602 | ||
2603 | error = proc_base_instantiate(dir, dentry, task, p); | |
2604 | ||
2605 | out: | |
2606 | put_task_struct(task); | |
2607 | out_no_task: | |
2608 | return error; | |
2609 | } | |
2610 | ||
c5141e6d ED |
2611 | static int proc_base_fill_cache(struct file *filp, void *dirent, |
2612 | filldir_t filldir, struct task_struct *task, const struct pid_entry *p) | |
61a28784 EB |
2613 | { |
2614 | return proc_fill_cache(filp, dirent, filldir, p->name, p->len, | |
2615 | proc_base_instantiate, task, p); | |
2616 | } | |
2617 | ||
aba76fdb | 2618 | #ifdef CONFIG_TASK_IO_ACCOUNTING |
297c5d92 AR |
2619 | static int do_io_accounting(struct task_struct *task, char *buffer, int whole) |
2620 | { | |
940389b8 | 2621 | struct task_io_accounting acct = task->ioac; |
5995477a AR |
2622 | unsigned long flags; |
2623 | ||
2624 | if (whole && lock_task_sighand(task, &flags)) { | |
2625 | struct task_struct *t = task; | |
2626 | ||
2627 | task_io_accounting_add(&acct, &task->signal->ioac); | |
2628 | while_each_thread(task, t) | |
2629 | task_io_accounting_add(&acct, &t->ioac); | |
2630 | ||
2631 | unlock_task_sighand(task, &flags); | |
297c5d92 | 2632 | } |
aba76fdb AM |
2633 | return sprintf(buffer, |
2634 | "rchar: %llu\n" | |
2635 | "wchar: %llu\n" | |
2636 | "syscr: %llu\n" | |
2637 | "syscw: %llu\n" | |
2638 | "read_bytes: %llu\n" | |
2639 | "write_bytes: %llu\n" | |
2640 | "cancelled_write_bytes: %llu\n", | |
7c44319d AB |
2641 | (unsigned long long)acct.rchar, |
2642 | (unsigned long long)acct.wchar, | |
2643 | (unsigned long long)acct.syscr, | |
2644 | (unsigned long long)acct.syscw, | |
2645 | (unsigned long long)acct.read_bytes, | |
2646 | (unsigned long long)acct.write_bytes, | |
2647 | (unsigned long long)acct.cancelled_write_bytes); | |
297c5d92 AR |
2648 | } |
2649 | ||
2650 | static int proc_tid_io_accounting(struct task_struct *task, char *buffer) | |
2651 | { | |
2652 | return do_io_accounting(task, buffer, 0); | |
aba76fdb | 2653 | } |
297c5d92 AR |
2654 | |
2655 | static int proc_tgid_io_accounting(struct task_struct *task, char *buffer) | |
2656 | { | |
2657 | return do_io_accounting(task, buffer, 1); | |
2658 | } | |
2659 | #endif /* CONFIG_TASK_IO_ACCOUNTING */ | |
aba76fdb | 2660 | |
47830723 KC |
2661 | static int proc_pid_personality(struct seq_file *m, struct pid_namespace *ns, |
2662 | struct pid *pid, struct task_struct *task) | |
2663 | { | |
2664 | seq_printf(m, "%08x\n", task->personality); | |
2665 | return 0; | |
2666 | } | |
2667 | ||
28a6d671 EB |
2668 | /* |
2669 | * Thread groups | |
2670 | */ | |
00977a59 | 2671 | static const struct file_operations proc_task_operations; |
c5ef1c42 | 2672 | static const struct inode_operations proc_task_inode_operations; |
20cdc894 | 2673 | |
c5141e6d | 2674 | static const struct pid_entry tgid_base_stuff[] = { |
631f9c18 AD |
2675 | DIR("task", S_IRUGO|S_IXUGO, proc_task_inode_operations, proc_task_operations), |
2676 | DIR("fd", S_IRUSR|S_IXUSR, proc_fd_inode_operations, proc_fd_operations), | |
2677 | DIR("fdinfo", S_IRUSR|S_IXUSR, proc_fdinfo_inode_operations, proc_fdinfo_operations), | |
b2211a36 | 2678 | #ifdef CONFIG_NET |
631f9c18 | 2679 | DIR("net", S_IRUGO|S_IXUGO, proc_net_inode_operations, proc_net_operations), |
b2211a36 | 2680 | #endif |
631f9c18 AD |
2681 | REG("environ", S_IRUSR, proc_environ_operations), |
2682 | INF("auxv", S_IRUSR, proc_pid_auxv), | |
2683 | ONE("status", S_IRUGO, proc_pid_status), | |
2684 | ONE("personality", S_IRUSR, proc_pid_personality), | |
3036e7b4 | 2685 | INF("limits", S_IRUGO, proc_pid_limits), |
43ae34cb | 2686 | #ifdef CONFIG_SCHED_DEBUG |
631f9c18 | 2687 | REG("sched", S_IRUGO|S_IWUSR, proc_pid_sched_operations), |
ebcb6734 | 2688 | #endif |
4614a696 | 2689 | REG("comm", S_IRUGO|S_IWUSR, proc_pid_set_comm_operations), |
ebcb6734 | 2690 | #ifdef CONFIG_HAVE_ARCH_TRACEHOOK |
631f9c18 | 2691 | INF("syscall", S_IRUSR, proc_pid_syscall), |
43ae34cb | 2692 | #endif |
631f9c18 AD |
2693 | INF("cmdline", S_IRUGO, proc_pid_cmdline), |
2694 | ONE("stat", S_IRUGO, proc_tgid_stat), | |
2695 | ONE("statm", S_IRUGO, proc_pid_statm), | |
2696 | REG("maps", S_IRUGO, proc_maps_operations), | |
28a6d671 | 2697 | #ifdef CONFIG_NUMA |
631f9c18 | 2698 | REG("numa_maps", S_IRUGO, proc_numa_maps_operations), |
28a6d671 | 2699 | #endif |
631f9c18 AD |
2700 | REG("mem", S_IRUSR|S_IWUSR, proc_mem_operations), |
2701 | LNK("cwd", proc_cwd_link), | |
2702 | LNK("root", proc_root_link), | |
2703 | LNK("exe", proc_exe_link), | |
2704 | REG("mounts", S_IRUGO, proc_mounts_operations), | |
2705 | REG("mountinfo", S_IRUGO, proc_mountinfo_operations), | |
2706 | REG("mountstats", S_IRUSR, proc_mountstats_operations), | |
1e883281 | 2707 | #ifdef CONFIG_PROC_PAGE_MONITOR |
631f9c18 AD |
2708 | REG("clear_refs", S_IWUSR, proc_clear_refs_operations), |
2709 | REG("smaps", S_IRUGO, proc_smaps_operations), | |
2710 | REG("pagemap", S_IRUSR, proc_pagemap_operations), | |
28a6d671 EB |
2711 | #endif |
2712 | #ifdef CONFIG_SECURITY | |
631f9c18 | 2713 | DIR("attr", S_IRUGO|S_IXUGO, proc_attr_dir_inode_operations, proc_attr_dir_operations), |
28a6d671 EB |
2714 | #endif |
2715 | #ifdef CONFIG_KALLSYMS | |
631f9c18 | 2716 | INF("wchan", S_IRUGO, proc_pid_wchan), |
28a6d671 | 2717 | #endif |
2ec220e2 KC |
2718 | #ifdef CONFIG_STACKTRACE |
2719 | ONE("stack", S_IRUSR, proc_pid_stack), | |
28a6d671 EB |
2720 | #endif |
2721 | #ifdef CONFIG_SCHEDSTATS | |
631f9c18 | 2722 | INF("schedstat", S_IRUGO, proc_pid_schedstat), |
28a6d671 | 2723 | #endif |
9745512c | 2724 | #ifdef CONFIG_LATENCYTOP |
631f9c18 | 2725 | REG("latency", S_IRUGO, proc_lstats_operations), |
9745512c | 2726 | #endif |
8793d854 | 2727 | #ifdef CONFIG_PROC_PID_CPUSET |
631f9c18 | 2728 | REG("cpuset", S_IRUGO, proc_cpuset_operations), |
a424316c PM |
2729 | #endif |
2730 | #ifdef CONFIG_CGROUPS | |
631f9c18 | 2731 | REG("cgroup", S_IRUGO, proc_cgroup_operations), |
28a6d671 | 2732 | #endif |
631f9c18 AD |
2733 | INF("oom_score", S_IRUGO, proc_oom_score), |
2734 | REG("oom_adj", S_IRUGO|S_IWUSR, proc_oom_adjust_operations), | |
a63d83f4 | 2735 | REG("oom_score_adj", S_IRUGO|S_IWUSR, proc_oom_score_adj_operations), |
28a6d671 | 2736 | #ifdef CONFIG_AUDITSYSCALL |
631f9c18 AD |
2737 | REG("loginuid", S_IWUSR|S_IRUGO, proc_loginuid_operations), |
2738 | REG("sessionid", S_IRUGO, proc_sessionid_operations), | |
28a6d671 | 2739 | #endif |
f4f154fd | 2740 | #ifdef CONFIG_FAULT_INJECTION |
631f9c18 | 2741 | REG("make-it-fail", S_IRUGO|S_IWUSR, proc_fault_inject_operations), |
f4f154fd | 2742 | #endif |
698ba7b5 | 2743 | #ifdef CONFIG_ELF_CORE |
631f9c18 | 2744 | REG("coredump_filter", S_IRUGO|S_IWUSR, proc_coredump_filter_operations), |
3cb4a0bb | 2745 | #endif |
aba76fdb | 2746 | #ifdef CONFIG_TASK_IO_ACCOUNTING |
631f9c18 | 2747 | INF("io", S_IRUGO, proc_tgid_io_accounting), |
aba76fdb | 2748 | #endif |
28a6d671 | 2749 | }; |
1da177e4 | 2750 | |
28a6d671 | 2751 | static int proc_tgid_base_readdir(struct file * filp, |
1da177e4 LT |
2752 | void * dirent, filldir_t filldir) |
2753 | { | |
2754 | return proc_pident_readdir(filp,dirent,filldir, | |
28a6d671 | 2755 | tgid_base_stuff,ARRAY_SIZE(tgid_base_stuff)); |
1da177e4 LT |
2756 | } |
2757 | ||
00977a59 | 2758 | static const struct file_operations proc_tgid_base_operations = { |
1da177e4 | 2759 | .read = generic_read_dir, |
28a6d671 | 2760 | .readdir = proc_tgid_base_readdir, |
6038f373 | 2761 | .llseek = default_llseek, |
1da177e4 LT |
2762 | }; |
2763 | ||
28a6d671 | 2764 | static struct dentry *proc_tgid_base_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd){ |
7bcd6b0e EB |
2765 | return proc_pident_lookup(dir, dentry, |
2766 | tgid_base_stuff, ARRAY_SIZE(tgid_base_stuff)); | |
1da177e4 LT |
2767 | } |
2768 | ||
c5ef1c42 | 2769 | static const struct inode_operations proc_tgid_base_inode_operations = { |
28a6d671 | 2770 | .lookup = proc_tgid_base_lookup, |
99f89551 | 2771 | .getattr = pid_getattr, |
6d76fa58 | 2772 | .setattr = proc_setattr, |
1da177e4 | 2773 | }; |
1da177e4 | 2774 | |
60347f67 | 2775 | static void proc_flush_task_mnt(struct vfsmount *mnt, pid_t pid, pid_t tgid) |
1da177e4 | 2776 | { |
48e6484d | 2777 | struct dentry *dentry, *leader, *dir; |
8578cea7 | 2778 | char buf[PROC_NUMBUF]; |
48e6484d EB |
2779 | struct qstr name; |
2780 | ||
2781 | name.name = buf; | |
60347f67 PE |
2782 | name.len = snprintf(buf, sizeof(buf), "%d", pid); |
2783 | dentry = d_hash_and_lookup(mnt->mnt_root, &name); | |
48e6484d | 2784 | if (dentry) { |
29f12ca3 | 2785 | shrink_dcache_parent(dentry); |
48e6484d EB |
2786 | d_drop(dentry); |
2787 | dput(dentry); | |
2788 | } | |
1da177e4 | 2789 | |
48e6484d | 2790 | name.name = buf; |
60347f67 PE |
2791 | name.len = snprintf(buf, sizeof(buf), "%d", tgid); |
2792 | leader = d_hash_and_lookup(mnt->mnt_root, &name); | |
48e6484d EB |
2793 | if (!leader) |
2794 | goto out; | |
1da177e4 | 2795 | |
48e6484d EB |
2796 | name.name = "task"; |
2797 | name.len = strlen(name.name); | |
2798 | dir = d_hash_and_lookup(leader, &name); | |
2799 | if (!dir) | |
2800 | goto out_put_leader; | |
2801 | ||
2802 | name.name = buf; | |
60347f67 | 2803 | name.len = snprintf(buf, sizeof(buf), "%d", pid); |
48e6484d EB |
2804 | dentry = d_hash_and_lookup(dir, &name); |
2805 | if (dentry) { | |
2806 | shrink_dcache_parent(dentry); | |
2807 | d_drop(dentry); | |
2808 | dput(dentry); | |
1da177e4 | 2809 | } |
48e6484d EB |
2810 | |
2811 | dput(dir); | |
2812 | out_put_leader: | |
2813 | dput(leader); | |
2814 | out: | |
2815 | return; | |
1da177e4 LT |
2816 | } |
2817 | ||
0895e91d RD |
2818 | /** |
2819 | * proc_flush_task - Remove dcache entries for @task from the /proc dcache. | |
2820 | * @task: task that should be flushed. | |
2821 | * | |
2822 | * When flushing dentries from proc, one needs to flush them from global | |
60347f67 | 2823 | * proc (proc_mnt) and from all the namespaces' procs this task was seen |
0895e91d RD |
2824 | * in. This call is supposed to do all of this job. |
2825 | * | |
2826 | * Looks in the dcache for | |
2827 | * /proc/@pid | |
2828 | * /proc/@tgid/task/@pid | |
2829 | * if either directory is present flushes it and all of it'ts children | |
2830 | * from the dcache. | |
2831 | * | |
2832 | * It is safe and reasonable to cache /proc entries for a task until | |
2833 | * that task exits. After that they just clog up the dcache with | |
2834 | * useless entries, possibly causing useful dcache entries to be | |
2835 | * flushed instead. This routine is proved to flush those useless | |
2836 | * dcache entries at process exit time. | |
2837 | * | |
2838 | * NOTE: This routine is just an optimization so it does not guarantee | |
2839 | * that no dcache entries will exist at process exit time it | |
2840 | * just makes it very unlikely that any will persist. | |
60347f67 PE |
2841 | */ |
2842 | ||
2843 | void proc_flush_task(struct task_struct *task) | |
2844 | { | |
9fcc2d15 | 2845 | int i; |
9b4d1cbe | 2846 | struct pid *pid, *tgid; |
130f77ec PE |
2847 | struct upid *upid; |
2848 | ||
130f77ec | 2849 | pid = task_pid(task); |
9b4d1cbe | 2850 | tgid = task_tgid(task); |
130f77ec | 2851 | |
9fcc2d15 | 2852 | for (i = 0; i <= pid->level; i++) { |
130f77ec PE |
2853 | upid = &pid->numbers[i]; |
2854 | proc_flush_task_mnt(upid->ns->proc_mnt, upid->nr, | |
9b4d1cbe | 2855 | tgid->numbers[i].nr); |
130f77ec | 2856 | } |
6f4e6433 PE |
2857 | |
2858 | upid = &pid->numbers[pid->level]; | |
2859 | if (upid->nr == 1) | |
2860 | pid_ns_release_proc(upid->ns); | |
60347f67 PE |
2861 | } |
2862 | ||
9711ef99 AB |
2863 | static struct dentry *proc_pid_instantiate(struct inode *dir, |
2864 | struct dentry * dentry, | |
c5141e6d | 2865 | struct task_struct *task, const void *ptr) |
444ceed8 EB |
2866 | { |
2867 | struct dentry *error = ERR_PTR(-ENOENT); | |
2868 | struct inode *inode; | |
2869 | ||
61a28784 | 2870 | inode = proc_pid_make_inode(dir->i_sb, task); |
444ceed8 EB |
2871 | if (!inode) |
2872 | goto out; | |
2873 | ||
2874 | inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO; | |
2875 | inode->i_op = &proc_tgid_base_inode_operations; | |
2876 | inode->i_fop = &proc_tgid_base_operations; | |
2877 | inode->i_flags|=S_IMMUTABLE; | |
aed54175 VN |
2878 | |
2879 | inode->i_nlink = 2 + pid_entry_count_dirs(tgid_base_stuff, | |
2880 | ARRAY_SIZE(tgid_base_stuff)); | |
444ceed8 EB |
2881 | |
2882 | dentry->d_op = &pid_dentry_operations; | |
2883 | ||
2884 | d_add(dentry, inode); | |
2885 | /* Close the race of the process dying before we return the dentry */ | |
2886 | if (pid_revalidate(dentry, NULL)) | |
2887 | error = NULL; | |
2888 | out: | |
2889 | return error; | |
2890 | } | |
2891 | ||
1da177e4 LT |
2892 | struct dentry *proc_pid_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd) |
2893 | { | |
73d36460 | 2894 | struct dentry *result; |
1da177e4 | 2895 | struct task_struct *task; |
1da177e4 | 2896 | unsigned tgid; |
b488893a | 2897 | struct pid_namespace *ns; |
1da177e4 | 2898 | |
801199ce EB |
2899 | result = proc_base_lookup(dir, dentry); |
2900 | if (!IS_ERR(result) || PTR_ERR(result) != -ENOENT) | |
2901 | goto out; | |
2902 | ||
1da177e4 LT |
2903 | tgid = name_to_int(dentry); |
2904 | if (tgid == ~0U) | |
2905 | goto out; | |
2906 | ||
b488893a | 2907 | ns = dentry->d_sb->s_fs_info; |
de758734 | 2908 | rcu_read_lock(); |
b488893a | 2909 | task = find_task_by_pid_ns(tgid, ns); |
1da177e4 LT |
2910 | if (task) |
2911 | get_task_struct(task); | |
de758734 | 2912 | rcu_read_unlock(); |
1da177e4 LT |
2913 | if (!task) |
2914 | goto out; | |
2915 | ||
444ceed8 | 2916 | result = proc_pid_instantiate(dir, dentry, task, NULL); |
1da177e4 | 2917 | put_task_struct(task); |
1da177e4 | 2918 | out: |
cd6a3ce9 | 2919 | return result; |
1da177e4 LT |
2920 | } |
2921 | ||
1da177e4 | 2922 | /* |
0804ef4b | 2923 | * Find the first task with tgid >= tgid |
0bc58a91 | 2924 | * |
1da177e4 | 2925 | */ |
19fd4bb2 EB |
2926 | struct tgid_iter { |
2927 | unsigned int tgid; | |
0804ef4b | 2928 | struct task_struct *task; |
19fd4bb2 EB |
2929 | }; |
2930 | static struct tgid_iter next_tgid(struct pid_namespace *ns, struct tgid_iter iter) | |
2931 | { | |
0804ef4b | 2932 | struct pid *pid; |
1da177e4 | 2933 | |
19fd4bb2 EB |
2934 | if (iter.task) |
2935 | put_task_struct(iter.task); | |
454cc105 | 2936 | rcu_read_lock(); |
0804ef4b | 2937 | retry: |
19fd4bb2 EB |
2938 | iter.task = NULL; |
2939 | pid = find_ge_pid(iter.tgid, ns); | |
0804ef4b | 2940 | if (pid) { |
19fd4bb2 EB |
2941 | iter.tgid = pid_nr_ns(pid, ns); |
2942 | iter.task = pid_task(pid, PIDTYPE_PID); | |
0804ef4b EB |
2943 | /* What we to know is if the pid we have find is the |
2944 | * pid of a thread_group_leader. Testing for task | |
2945 | * being a thread_group_leader is the obvious thing | |
2946 | * todo but there is a window when it fails, due to | |
2947 | * the pid transfer logic in de_thread. | |
2948 | * | |
2949 | * So we perform the straight forward test of seeing | |
2950 | * if the pid we have found is the pid of a thread | |
2951 | * group leader, and don't worry if the task we have | |
2952 | * found doesn't happen to be a thread group leader. | |
2953 | * As we don't care in the case of readdir. | |
2954 | */ | |
19fd4bb2 EB |
2955 | if (!iter.task || !has_group_leader_pid(iter.task)) { |
2956 | iter.tgid += 1; | |
0804ef4b | 2957 | goto retry; |
19fd4bb2 EB |
2958 | } |
2959 | get_task_struct(iter.task); | |
0bc58a91 | 2960 | } |
454cc105 | 2961 | rcu_read_unlock(); |
19fd4bb2 | 2962 | return iter; |
1da177e4 LT |
2963 | } |
2964 | ||
7bcd6b0e | 2965 | #define TGID_OFFSET (FIRST_PROCESS_ENTRY + ARRAY_SIZE(proc_base_stuff)) |
0804ef4b | 2966 | |
61a28784 | 2967 | static int proc_pid_fill_cache(struct file *filp, void *dirent, filldir_t filldir, |
19fd4bb2 | 2968 | struct tgid_iter iter) |
61a28784 EB |
2969 | { |
2970 | char name[PROC_NUMBUF]; | |
19fd4bb2 | 2971 | int len = snprintf(name, sizeof(name), "%d", iter.tgid); |
61a28784 | 2972 | return proc_fill_cache(filp, dirent, filldir, name, len, |
19fd4bb2 | 2973 | proc_pid_instantiate, iter.task, NULL); |
61a28784 EB |
2974 | } |
2975 | ||
1da177e4 LT |
2976 | /* for the /proc/ directory itself, after non-process stuff has been done */ |
2977 | int proc_pid_readdir(struct file * filp, void * dirent, filldir_t filldir) | |
2978 | { | |
1da177e4 | 2979 | unsigned int nr = filp->f_pos - FIRST_PROCESS_ENTRY; |
2fddfeef | 2980 | struct task_struct *reaper = get_proc_task(filp->f_path.dentry->d_inode); |
19fd4bb2 | 2981 | struct tgid_iter iter; |
b488893a | 2982 | struct pid_namespace *ns; |
1da177e4 | 2983 | |
61a28784 EB |
2984 | if (!reaper) |
2985 | goto out_no_task; | |
2986 | ||
7bcd6b0e | 2987 | for (; nr < ARRAY_SIZE(proc_base_stuff); filp->f_pos++, nr++) { |
c5141e6d | 2988 | const struct pid_entry *p = &proc_base_stuff[nr]; |
61a28784 | 2989 | if (proc_base_fill_cache(filp, dirent, filldir, reaper, p) < 0) |
801199ce | 2990 | goto out; |
1da177e4 LT |
2991 | } |
2992 | ||
b488893a | 2993 | ns = filp->f_dentry->d_sb->s_fs_info; |
19fd4bb2 EB |
2994 | iter.task = NULL; |
2995 | iter.tgid = filp->f_pos - TGID_OFFSET; | |
2996 | for (iter = next_tgid(ns, iter); | |
2997 | iter.task; | |
2998 | iter.tgid += 1, iter = next_tgid(ns, iter)) { | |
2999 | filp->f_pos = iter.tgid + TGID_OFFSET; | |
3000 | if (proc_pid_fill_cache(filp, dirent, filldir, iter) < 0) { | |
3001 | put_task_struct(iter.task); | |
0804ef4b | 3002 | goto out; |
1da177e4 | 3003 | } |
0bc58a91 | 3004 | } |
0804ef4b EB |
3005 | filp->f_pos = PID_MAX_LIMIT + TGID_OFFSET; |
3006 | out: | |
61a28784 EB |
3007 | put_task_struct(reaper); |
3008 | out_no_task: | |
0bc58a91 EB |
3009 | return 0; |
3010 | } | |
1da177e4 | 3011 | |
28a6d671 EB |
3012 | /* |
3013 | * Tasks | |
3014 | */ | |
c5141e6d | 3015 | static const struct pid_entry tid_base_stuff[] = { |
631f9c18 | 3016 | DIR("fd", S_IRUSR|S_IXUSR, proc_fd_inode_operations, proc_fd_operations), |
3835541d | 3017 | DIR("fdinfo", S_IRUSR|S_IXUSR, proc_fdinfo_inode_operations, proc_fdinfo_operations), |
631f9c18 AD |
3018 | REG("environ", S_IRUSR, proc_environ_operations), |
3019 | INF("auxv", S_IRUSR, proc_pid_auxv), | |
3020 | ONE("status", S_IRUGO, proc_pid_status), | |
3021 | ONE("personality", S_IRUSR, proc_pid_personality), | |
3036e7b4 | 3022 | INF("limits", S_IRUGO, proc_pid_limits), |
43ae34cb | 3023 | #ifdef CONFIG_SCHED_DEBUG |
631f9c18 | 3024 | REG("sched", S_IRUGO|S_IWUSR, proc_pid_sched_operations), |
ebcb6734 | 3025 | #endif |
4614a696 | 3026 | REG("comm", S_IRUGO|S_IWUSR, proc_pid_set_comm_operations), |
ebcb6734 | 3027 | #ifdef CONFIG_HAVE_ARCH_TRACEHOOK |
631f9c18 | 3028 | INF("syscall", S_IRUSR, proc_pid_syscall), |
43ae34cb | 3029 | #endif |
631f9c18 AD |
3030 | INF("cmdline", S_IRUGO, proc_pid_cmdline), |
3031 | ONE("stat", S_IRUGO, proc_tid_stat), | |
3032 | ONE("statm", S_IRUGO, proc_pid_statm), | |
3033 | REG("maps", S_IRUGO, proc_maps_operations), | |
28a6d671 | 3034 | #ifdef CONFIG_NUMA |
631f9c18 | 3035 | REG("numa_maps", S_IRUGO, proc_numa_maps_operations), |
28a6d671 | 3036 | #endif |
631f9c18 AD |
3037 | REG("mem", S_IRUSR|S_IWUSR, proc_mem_operations), |
3038 | LNK("cwd", proc_cwd_link), | |
3039 | LNK("root", proc_root_link), | |
3040 | LNK("exe", proc_exe_link), | |
3041 | REG("mounts", S_IRUGO, proc_mounts_operations), | |
3042 | REG("mountinfo", S_IRUGO, proc_mountinfo_operations), | |
1e883281 | 3043 | #ifdef CONFIG_PROC_PAGE_MONITOR |
631f9c18 AD |
3044 | REG("clear_refs", S_IWUSR, proc_clear_refs_operations), |
3045 | REG("smaps", S_IRUGO, proc_smaps_operations), | |
3046 | REG("pagemap", S_IRUSR, proc_pagemap_operations), | |
28a6d671 EB |
3047 | #endif |
3048 | #ifdef CONFIG_SECURITY | |
631f9c18 | 3049 | DIR("attr", S_IRUGO|S_IXUGO, proc_attr_dir_inode_operations, proc_attr_dir_operations), |
28a6d671 EB |
3050 | #endif |
3051 | #ifdef CONFIG_KALLSYMS | |
631f9c18 | 3052 | INF("wchan", S_IRUGO, proc_pid_wchan), |
28a6d671 | 3053 | #endif |
2ec220e2 KC |
3054 | #ifdef CONFIG_STACKTRACE |
3055 | ONE("stack", S_IRUSR, proc_pid_stack), | |
28a6d671 EB |
3056 | #endif |
3057 | #ifdef CONFIG_SCHEDSTATS | |
631f9c18 | 3058 | INF("schedstat", S_IRUGO, proc_pid_schedstat), |
28a6d671 | 3059 | #endif |
9745512c | 3060 | #ifdef CONFIG_LATENCYTOP |
631f9c18 | 3061 | REG("latency", S_IRUGO, proc_lstats_operations), |
9745512c | 3062 | #endif |
8793d854 | 3063 | #ifdef CONFIG_PROC_PID_CPUSET |
631f9c18 | 3064 | REG("cpuset", S_IRUGO, proc_cpuset_operations), |
a424316c PM |
3065 | #endif |
3066 | #ifdef CONFIG_CGROUPS | |
631f9c18 | 3067 | REG("cgroup", S_IRUGO, proc_cgroup_operations), |
28a6d671 | 3068 | #endif |
631f9c18 AD |
3069 | INF("oom_score", S_IRUGO, proc_oom_score), |
3070 | REG("oom_adj", S_IRUGO|S_IWUSR, proc_oom_adjust_operations), | |
a63d83f4 | 3071 | REG("oom_score_adj", S_IRUGO|S_IWUSR, proc_oom_score_adj_operations), |
28a6d671 | 3072 | #ifdef CONFIG_AUDITSYSCALL |
631f9c18 AD |
3073 | REG("loginuid", S_IWUSR|S_IRUGO, proc_loginuid_operations), |
3074 | REG("sessionid", S_IRUSR, proc_sessionid_operations), | |
28a6d671 | 3075 | #endif |
f4f154fd | 3076 | #ifdef CONFIG_FAULT_INJECTION |
631f9c18 | 3077 | REG("make-it-fail", S_IRUGO|S_IWUSR, proc_fault_inject_operations), |
f4f154fd | 3078 | #endif |
297c5d92 | 3079 | #ifdef CONFIG_TASK_IO_ACCOUNTING |
631f9c18 | 3080 | INF("io", S_IRUGO, proc_tid_io_accounting), |
297c5d92 | 3081 | #endif |
28a6d671 EB |
3082 | }; |
3083 | ||
3084 | static int proc_tid_base_readdir(struct file * filp, | |
3085 | void * dirent, filldir_t filldir) | |
3086 | { | |
3087 | return proc_pident_readdir(filp,dirent,filldir, | |
3088 | tid_base_stuff,ARRAY_SIZE(tid_base_stuff)); | |
3089 | } | |
3090 | ||
3091 | static struct dentry *proc_tid_base_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd){ | |
7bcd6b0e EB |
3092 | return proc_pident_lookup(dir, dentry, |
3093 | tid_base_stuff, ARRAY_SIZE(tid_base_stuff)); | |
28a6d671 EB |
3094 | } |
3095 | ||
00977a59 | 3096 | static const struct file_operations proc_tid_base_operations = { |
28a6d671 EB |
3097 | .read = generic_read_dir, |
3098 | .readdir = proc_tid_base_readdir, | |
6038f373 | 3099 | .llseek = default_llseek, |
28a6d671 EB |
3100 | }; |
3101 | ||
c5ef1c42 | 3102 | static const struct inode_operations proc_tid_base_inode_operations = { |
28a6d671 EB |
3103 | .lookup = proc_tid_base_lookup, |
3104 | .getattr = pid_getattr, | |
3105 | .setattr = proc_setattr, | |
3106 | }; | |
3107 | ||
444ceed8 | 3108 | static struct dentry *proc_task_instantiate(struct inode *dir, |
c5141e6d | 3109 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
444ceed8 EB |
3110 | { |
3111 | struct dentry *error = ERR_PTR(-ENOENT); | |
3112 | struct inode *inode; | |
61a28784 | 3113 | inode = proc_pid_make_inode(dir->i_sb, task); |
444ceed8 EB |
3114 | |
3115 | if (!inode) | |
3116 | goto out; | |
3117 | inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO; | |
3118 | inode->i_op = &proc_tid_base_inode_operations; | |
3119 | inode->i_fop = &proc_tid_base_operations; | |
3120 | inode->i_flags|=S_IMMUTABLE; | |
aed54175 VN |
3121 | |
3122 | inode->i_nlink = 2 + pid_entry_count_dirs(tid_base_stuff, | |
3123 | ARRAY_SIZE(tid_base_stuff)); | |
444ceed8 EB |
3124 | |
3125 | dentry->d_op = &pid_dentry_operations; | |
3126 | ||
3127 | d_add(dentry, inode); | |
3128 | /* Close the race of the process dying before we return the dentry */ | |
3129 | if (pid_revalidate(dentry, NULL)) | |
3130 | error = NULL; | |
3131 | out: | |
3132 | return error; | |
3133 | } | |
3134 | ||
28a6d671 EB |
3135 | static struct dentry *proc_task_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd) |
3136 | { | |
3137 | struct dentry *result = ERR_PTR(-ENOENT); | |
3138 | struct task_struct *task; | |
3139 | struct task_struct *leader = get_proc_task(dir); | |
28a6d671 | 3140 | unsigned tid; |
b488893a | 3141 | struct pid_namespace *ns; |
28a6d671 EB |
3142 | |
3143 | if (!leader) | |
3144 | goto out_no_task; | |
3145 | ||
3146 | tid = name_to_int(dentry); | |
3147 | if (tid == ~0U) | |
3148 | goto out; | |
3149 | ||
b488893a | 3150 | ns = dentry->d_sb->s_fs_info; |
28a6d671 | 3151 | rcu_read_lock(); |
b488893a | 3152 | task = find_task_by_pid_ns(tid, ns); |
28a6d671 EB |
3153 | if (task) |
3154 | get_task_struct(task); | |
3155 | rcu_read_unlock(); | |
3156 | if (!task) | |
3157 | goto out; | |
bac0abd6 | 3158 | if (!same_thread_group(leader, task)) |
28a6d671 EB |
3159 | goto out_drop_task; |
3160 | ||
444ceed8 | 3161 | result = proc_task_instantiate(dir, dentry, task, NULL); |
28a6d671 EB |
3162 | out_drop_task: |
3163 | put_task_struct(task); | |
3164 | out: | |
3165 | put_task_struct(leader); | |
3166 | out_no_task: | |
3167 | return result; | |
3168 | } | |
3169 | ||
0bc58a91 EB |
3170 | /* |
3171 | * Find the first tid of a thread group to return to user space. | |
3172 | * | |
3173 | * Usually this is just the thread group leader, but if the users | |
3174 | * buffer was too small or there was a seek into the middle of the | |
3175 | * directory we have more work todo. | |
3176 | * | |
3177 | * In the case of a short read we start with find_task_by_pid. | |
3178 | * | |
3179 | * In the case of a seek we start with the leader and walk nr | |
3180 | * threads past it. | |
3181 | */ | |
cc288738 | 3182 | static struct task_struct *first_tid(struct task_struct *leader, |
b488893a | 3183 | int tid, int nr, struct pid_namespace *ns) |
0bc58a91 | 3184 | { |
a872ff0c | 3185 | struct task_struct *pos; |
1da177e4 | 3186 | |
cc288738 | 3187 | rcu_read_lock(); |
0bc58a91 EB |
3188 | /* Attempt to start with the pid of a thread */ |
3189 | if (tid && (nr > 0)) { | |
b488893a | 3190 | pos = find_task_by_pid_ns(tid, ns); |
a872ff0c ON |
3191 | if (pos && (pos->group_leader == leader)) |
3192 | goto found; | |
0bc58a91 | 3193 | } |
1da177e4 | 3194 | |
0bc58a91 | 3195 | /* If nr exceeds the number of threads there is nothing todo */ |
a872ff0c ON |
3196 | pos = NULL; |
3197 | if (nr && nr >= get_nr_threads(leader)) | |
3198 | goto out; | |
1da177e4 | 3199 | |
a872ff0c ON |
3200 | /* If we haven't found our starting place yet start |
3201 | * with the leader and walk nr threads forward. | |
0bc58a91 | 3202 | */ |
a872ff0c ON |
3203 | for (pos = leader; nr > 0; --nr) { |
3204 | pos = next_thread(pos); | |
3205 | if (pos == leader) { | |
3206 | pos = NULL; | |
3207 | goto out; | |
3208 | } | |
1da177e4 | 3209 | } |
a872ff0c ON |
3210 | found: |
3211 | get_task_struct(pos); | |
3212 | out: | |
cc288738 | 3213 | rcu_read_unlock(); |
0bc58a91 EB |
3214 | return pos; |
3215 | } | |
3216 | ||
3217 | /* | |
3218 | * Find the next thread in the thread list. | |
3219 | * Return NULL if there is an error or no next thread. | |
3220 | * | |
3221 | * The reference to the input task_struct is released. | |
3222 | */ | |
3223 | static struct task_struct *next_tid(struct task_struct *start) | |
3224 | { | |
c1df7fb8 | 3225 | struct task_struct *pos = NULL; |
cc288738 | 3226 | rcu_read_lock(); |
c1df7fb8 | 3227 | if (pid_alive(start)) { |
0bc58a91 | 3228 | pos = next_thread(start); |
c1df7fb8 ON |
3229 | if (thread_group_leader(pos)) |
3230 | pos = NULL; | |
3231 | else | |
3232 | get_task_struct(pos); | |
3233 | } | |
cc288738 | 3234 | rcu_read_unlock(); |
0bc58a91 EB |
3235 | put_task_struct(start); |
3236 | return pos; | |
1da177e4 LT |
3237 | } |
3238 | ||
61a28784 EB |
3239 | static int proc_task_fill_cache(struct file *filp, void *dirent, filldir_t filldir, |
3240 | struct task_struct *task, int tid) | |
3241 | { | |
3242 | char name[PROC_NUMBUF]; | |
3243 | int len = snprintf(name, sizeof(name), "%d", tid); | |
3244 | return proc_fill_cache(filp, dirent, filldir, name, len, | |
3245 | proc_task_instantiate, task, NULL); | |
3246 | } | |
3247 | ||
1da177e4 LT |
3248 | /* for the /proc/TGID/task/ directories */ |
3249 | static int proc_task_readdir(struct file * filp, void * dirent, filldir_t filldir) | |
3250 | { | |
2fddfeef | 3251 | struct dentry *dentry = filp->f_path.dentry; |
1da177e4 | 3252 | struct inode *inode = dentry->d_inode; |
7d895244 | 3253 | struct task_struct *leader = NULL; |
0bc58a91 | 3254 | struct task_struct *task; |
1da177e4 LT |
3255 | int retval = -ENOENT; |
3256 | ino_t ino; | |
0bc58a91 | 3257 | int tid; |
b488893a | 3258 | struct pid_namespace *ns; |
1da177e4 | 3259 | |
7d895244 GC |
3260 | task = get_proc_task(inode); |
3261 | if (!task) | |
3262 | goto out_no_task; | |
3263 | rcu_read_lock(); | |
3264 | if (pid_alive(task)) { | |
3265 | leader = task->group_leader; | |
3266 | get_task_struct(leader); | |
3267 | } | |
3268 | rcu_read_unlock(); | |
3269 | put_task_struct(task); | |
99f89551 EB |
3270 | if (!leader) |
3271 | goto out_no_task; | |
1da177e4 LT |
3272 | retval = 0; |
3273 | ||
ee568b25 | 3274 | switch ((unsigned long)filp->f_pos) { |
1da177e4 LT |
3275 | case 0: |
3276 | ino = inode->i_ino; | |
ee6f779b | 3277 | if (filldir(dirent, ".", 1, filp->f_pos, ino, DT_DIR) < 0) |
1da177e4 | 3278 | goto out; |
ee6f779b | 3279 | filp->f_pos++; |
1da177e4 LT |
3280 | /* fall through */ |
3281 | case 1: | |
3282 | ino = parent_ino(dentry); | |
ee6f779b | 3283 | if (filldir(dirent, "..", 2, filp->f_pos, ino, DT_DIR) < 0) |
1da177e4 | 3284 | goto out; |
ee6f779b | 3285 | filp->f_pos++; |
1da177e4 LT |
3286 | /* fall through */ |
3287 | } | |
3288 | ||
0bc58a91 EB |
3289 | /* f_version caches the tgid value that the last readdir call couldn't |
3290 | * return. lseek aka telldir automagically resets f_version to 0. | |
3291 | */ | |
b488893a | 3292 | ns = filp->f_dentry->d_sb->s_fs_info; |
2b47c361 | 3293 | tid = (int)filp->f_version; |
0bc58a91 | 3294 | filp->f_version = 0; |
ee6f779b | 3295 | for (task = first_tid(leader, tid, filp->f_pos - 2, ns); |
0bc58a91 | 3296 | task; |
ee6f779b | 3297 | task = next_tid(task), filp->f_pos++) { |
b488893a | 3298 | tid = task_pid_nr_ns(task, ns); |
61a28784 | 3299 | if (proc_task_fill_cache(filp, dirent, filldir, task, tid) < 0) { |
0bc58a91 EB |
3300 | /* returning this tgid failed, save it as the first |
3301 | * pid for the next readir call */ | |
2b47c361 | 3302 | filp->f_version = (u64)tid; |
0bc58a91 | 3303 | put_task_struct(task); |
1da177e4 | 3304 | break; |
0bc58a91 | 3305 | } |
1da177e4 LT |
3306 | } |
3307 | out: | |
99f89551 EB |
3308 | put_task_struct(leader); |
3309 | out_no_task: | |
1da177e4 LT |
3310 | return retval; |
3311 | } | |
6e66b52b EB |
3312 | |
3313 | static int proc_task_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) | |
3314 | { | |
3315 | struct inode *inode = dentry->d_inode; | |
99f89551 | 3316 | struct task_struct *p = get_proc_task(inode); |
6e66b52b EB |
3317 | generic_fillattr(inode, stat); |
3318 | ||
99f89551 | 3319 | if (p) { |
99f89551 | 3320 | stat->nlink += get_nr_threads(p); |
99f89551 | 3321 | put_task_struct(p); |
6e66b52b EB |
3322 | } |
3323 | ||
3324 | return 0; | |
3325 | } | |
28a6d671 | 3326 | |
c5ef1c42 | 3327 | static const struct inode_operations proc_task_inode_operations = { |
28a6d671 EB |
3328 | .lookup = proc_task_lookup, |
3329 | .getattr = proc_task_getattr, | |
3330 | .setattr = proc_setattr, | |
3331 | }; | |
3332 | ||
00977a59 | 3333 | static const struct file_operations proc_task_operations = { |
28a6d671 EB |
3334 | .read = generic_read_dir, |
3335 | .readdir = proc_task_readdir, | |
6038f373 | 3336 | .llseek = default_llseek, |
28a6d671 | 3337 | }; |