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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); | |
774 | return 0; | |
775 | } | |
776 | ||
777 | static ssize_t mem_read(struct file * file, char __user * buf, | |
778 | size_t count, loff_t *ppos) | |
779 | { | |
2fddfeef | 780 | struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode); |
1da177e4 LT |
781 | char *page; |
782 | unsigned long src = *ppos; | |
783 | int ret = -ESRCH; | |
784 | struct mm_struct *mm; | |
785 | ||
99f89551 EB |
786 | if (!task) |
787 | goto out_no_task; | |
788 | ||
638fa202 | 789 | if (check_mem_permission(task)) |
1da177e4 LT |
790 | goto out; |
791 | ||
792 | ret = -ENOMEM; | |
e12ba74d | 793 | page = (char *)__get_free_page(GFP_TEMPORARY); |
1da177e4 LT |
794 | if (!page) |
795 | goto out; | |
796 | ||
797 | ret = 0; | |
798 | ||
799 | mm = get_task_mm(task); | |
800 | if (!mm) | |
801 | goto out_free; | |
802 | ||
803 | ret = -EIO; | |
804 | ||
805 | if (file->private_data != (void*)((long)current->self_exec_id)) | |
806 | goto out_put; | |
807 | ||
808 | ret = 0; | |
809 | ||
810 | while (count > 0) { | |
811 | int this_len, retval; | |
812 | ||
813 | this_len = (count > PAGE_SIZE) ? PAGE_SIZE : count; | |
814 | retval = access_process_vm(task, src, page, this_len, 0); | |
638fa202 | 815 | if (!retval || check_mem_permission(task)) { |
1da177e4 LT |
816 | if (!ret) |
817 | ret = -EIO; | |
818 | break; | |
819 | } | |
820 | ||
821 | if (copy_to_user(buf, page, retval)) { | |
822 | ret = -EFAULT; | |
823 | break; | |
824 | } | |
825 | ||
826 | ret += retval; | |
827 | src += retval; | |
828 | buf += retval; | |
829 | count -= retval; | |
830 | } | |
831 | *ppos = src; | |
832 | ||
833 | out_put: | |
834 | mmput(mm); | |
835 | out_free: | |
836 | free_page((unsigned long) page); | |
837 | out: | |
99f89551 EB |
838 | put_task_struct(task); |
839 | out_no_task: | |
1da177e4 LT |
840 | return ret; |
841 | } | |
842 | ||
843 | #define mem_write NULL | |
844 | ||
845 | #ifndef mem_write | |
846 | /* This is a security hazard */ | |
63967fa9 | 847 | static ssize_t mem_write(struct file * file, const char __user *buf, |
1da177e4 LT |
848 | size_t count, loff_t *ppos) |
849 | { | |
f7ca54f4 | 850 | int copied; |
1da177e4 | 851 | char *page; |
2fddfeef | 852 | struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode); |
1da177e4 LT |
853 | unsigned long dst = *ppos; |
854 | ||
99f89551 EB |
855 | copied = -ESRCH; |
856 | if (!task) | |
857 | goto out_no_task; | |
858 | ||
638fa202 | 859 | if (check_mem_permission(task)) |
99f89551 | 860 | goto out; |
1da177e4 | 861 | |
99f89551 | 862 | copied = -ENOMEM; |
e12ba74d | 863 | page = (char *)__get_free_page(GFP_TEMPORARY); |
1da177e4 | 864 | if (!page) |
99f89551 | 865 | goto out; |
1da177e4 | 866 | |
f7ca54f4 | 867 | copied = 0; |
1da177e4 LT |
868 | while (count > 0) { |
869 | int this_len, retval; | |
870 | ||
871 | this_len = (count > PAGE_SIZE) ? PAGE_SIZE : count; | |
872 | if (copy_from_user(page, buf, this_len)) { | |
873 | copied = -EFAULT; | |
874 | break; | |
875 | } | |
876 | retval = access_process_vm(task, dst, page, this_len, 1); | |
877 | if (!retval) { | |
878 | if (!copied) | |
879 | copied = -EIO; | |
880 | break; | |
881 | } | |
882 | copied += retval; | |
883 | buf += retval; | |
884 | dst += retval; | |
885 | count -= retval; | |
886 | } | |
887 | *ppos = dst; | |
888 | free_page((unsigned long) page); | |
99f89551 EB |
889 | out: |
890 | put_task_struct(task); | |
891 | out_no_task: | |
1da177e4 LT |
892 | return copied; |
893 | } | |
894 | #endif | |
895 | ||
85863e47 | 896 | loff_t mem_lseek(struct file *file, loff_t offset, int orig) |
1da177e4 LT |
897 | { |
898 | switch (orig) { | |
899 | case 0: | |
900 | file->f_pos = offset; | |
901 | break; | |
902 | case 1: | |
903 | file->f_pos += offset; | |
904 | break; | |
905 | default: | |
906 | return -EINVAL; | |
907 | } | |
908 | force_successful_syscall_return(); | |
909 | return file->f_pos; | |
910 | } | |
911 | ||
00977a59 | 912 | static const struct file_operations proc_mem_operations = { |
1da177e4 LT |
913 | .llseek = mem_lseek, |
914 | .read = mem_read, | |
915 | .write = mem_write, | |
916 | .open = mem_open, | |
917 | }; | |
918 | ||
315e28c8 JP |
919 | static ssize_t environ_read(struct file *file, char __user *buf, |
920 | size_t count, loff_t *ppos) | |
921 | { | |
922 | struct task_struct *task = get_proc_task(file->f_dentry->d_inode); | |
923 | char *page; | |
924 | unsigned long src = *ppos; | |
925 | int ret = -ESRCH; | |
926 | struct mm_struct *mm; | |
927 | ||
928 | if (!task) | |
929 | goto out_no_task; | |
930 | ||
006ebb40 | 931 | if (!ptrace_may_access(task, PTRACE_MODE_READ)) |
315e28c8 JP |
932 | goto out; |
933 | ||
934 | ret = -ENOMEM; | |
935 | page = (char *)__get_free_page(GFP_TEMPORARY); | |
936 | if (!page) | |
937 | goto out; | |
938 | ||
939 | ret = 0; | |
940 | ||
941 | mm = get_task_mm(task); | |
942 | if (!mm) | |
943 | goto out_free; | |
944 | ||
945 | while (count > 0) { | |
946 | int this_len, retval, max_len; | |
947 | ||
948 | this_len = mm->env_end - (mm->env_start + src); | |
949 | ||
950 | if (this_len <= 0) | |
951 | break; | |
952 | ||
953 | max_len = (count > PAGE_SIZE) ? PAGE_SIZE : count; | |
954 | this_len = (this_len > max_len) ? max_len : this_len; | |
955 | ||
956 | retval = access_process_vm(task, (mm->env_start + src), | |
957 | page, this_len, 0); | |
958 | ||
959 | if (retval <= 0) { | |
960 | ret = retval; | |
961 | break; | |
962 | } | |
963 | ||
964 | if (copy_to_user(buf, page, retval)) { | |
965 | ret = -EFAULT; | |
966 | break; | |
967 | } | |
968 | ||
969 | ret += retval; | |
970 | src += retval; | |
971 | buf += retval; | |
972 | count -= retval; | |
973 | } | |
974 | *ppos = src; | |
975 | ||
976 | mmput(mm); | |
977 | out_free: | |
978 | free_page((unsigned long) page); | |
979 | out: | |
980 | put_task_struct(task); | |
981 | out_no_task: | |
982 | return ret; | |
983 | } | |
984 | ||
985 | static const struct file_operations proc_environ_operations = { | |
986 | .read = environ_read, | |
87df8424 | 987 | .llseek = generic_file_llseek, |
315e28c8 JP |
988 | }; |
989 | ||
1da177e4 LT |
990 | static ssize_t oom_adjust_read(struct file *file, char __user *buf, |
991 | size_t count, loff_t *ppos) | |
992 | { | |
2fddfeef | 993 | struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode); |
8578cea7 | 994 | char buffer[PROC_NUMBUF]; |
1da177e4 | 995 | size_t len; |
28b83c51 KM |
996 | int oom_adjust = OOM_DISABLE; |
997 | unsigned long flags; | |
1da177e4 | 998 | |
99f89551 EB |
999 | if (!task) |
1000 | return -ESRCH; | |
28b83c51 KM |
1001 | |
1002 | if (lock_task_sighand(task, &flags)) { | |
1003 | oom_adjust = task->signal->oom_adj; | |
1004 | unlock_task_sighand(task, &flags); | |
1005 | } | |
1006 | ||
99f89551 EB |
1007 | put_task_struct(task); |
1008 | ||
8578cea7 | 1009 | len = snprintf(buffer, sizeof(buffer), "%i\n", oom_adjust); |
0c28f287 AM |
1010 | |
1011 | return simple_read_from_buffer(buf, count, ppos, buffer, len); | |
1da177e4 LT |
1012 | } |
1013 | ||
1014 | static ssize_t oom_adjust_write(struct file *file, const char __user *buf, | |
1015 | size_t count, loff_t *ppos) | |
1016 | { | |
99f89551 | 1017 | struct task_struct *task; |
5d863b89 KM |
1018 | char buffer[PROC_NUMBUF]; |
1019 | long oom_adjust; | |
28b83c51 | 1020 | unsigned long flags; |
5d863b89 | 1021 | int err; |
1da177e4 | 1022 | |
8578cea7 EB |
1023 | memset(buffer, 0, sizeof(buffer)); |
1024 | if (count > sizeof(buffer) - 1) | |
1025 | count = sizeof(buffer) - 1; | |
1da177e4 LT |
1026 | if (copy_from_user(buffer, buf, count)) |
1027 | return -EFAULT; | |
5d863b89 KM |
1028 | |
1029 | err = strict_strtol(strstrip(buffer), 0, &oom_adjust); | |
1030 | if (err) | |
1031 | return -EINVAL; | |
8ac773b4 AD |
1032 | if ((oom_adjust < OOM_ADJUST_MIN || oom_adjust > OOM_ADJUST_MAX) && |
1033 | oom_adjust != OOM_DISABLE) | |
1da177e4 | 1034 | return -EINVAL; |
5d863b89 | 1035 | |
2fddfeef | 1036 | task = get_proc_task(file->f_path.dentry->d_inode); |
99f89551 EB |
1037 | if (!task) |
1038 | return -ESRCH; | |
28b83c51 KM |
1039 | if (!lock_task_sighand(task, &flags)) { |
1040 | put_task_struct(task); | |
1041 | return -ESRCH; | |
1042 | } | |
1043 | ||
1044 | if (oom_adjust < task->signal->oom_adj && !capable(CAP_SYS_RESOURCE)) { | |
1045 | unlock_task_sighand(task, &flags); | |
8fb4fc68 GJ |
1046 | put_task_struct(task); |
1047 | return -EACCES; | |
1048 | } | |
28b83c51 | 1049 | |
51b1bd2a DR |
1050 | /* |
1051 | * Warn that /proc/pid/oom_adj is deprecated, see | |
1052 | * Documentation/feature-removal-schedule.txt. | |
1053 | */ | |
1054 | printk_once(KERN_WARNING "%s (%d): /proc/%d/oom_adj is deprecated, " | |
1055 | "please use /proc/%d/oom_score_adj instead.\n", | |
1056 | current->comm, task_pid_nr(current), | |
1057 | task_pid_nr(task), task_pid_nr(task)); | |
28b83c51 | 1058 | task->signal->oom_adj = oom_adjust; |
a63d83f4 DR |
1059 | /* |
1060 | * Scale /proc/pid/oom_score_adj appropriately ensuring that a maximum | |
1061 | * value is always attainable. | |
1062 | */ | |
1063 | if (task->signal->oom_adj == OOM_ADJUST_MAX) | |
1064 | task->signal->oom_score_adj = OOM_SCORE_ADJ_MAX; | |
1065 | else | |
1066 | task->signal->oom_score_adj = (oom_adjust * OOM_SCORE_ADJ_MAX) / | |
1067 | -OOM_DISABLE; | |
28b83c51 | 1068 | unlock_task_sighand(task, &flags); |
99f89551 | 1069 | put_task_struct(task); |
5d863b89 KM |
1070 | |
1071 | return count; | |
1da177e4 LT |
1072 | } |
1073 | ||
00977a59 | 1074 | static const struct file_operations proc_oom_adjust_operations = { |
1da177e4 LT |
1075 | .read = oom_adjust_read, |
1076 | .write = oom_adjust_write, | |
87df8424 | 1077 | .llseek = generic_file_llseek, |
1da177e4 LT |
1078 | }; |
1079 | ||
a63d83f4 DR |
1080 | static ssize_t oom_score_adj_read(struct file *file, char __user *buf, |
1081 | size_t count, loff_t *ppos) | |
1082 | { | |
1083 | struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode); | |
1084 | char buffer[PROC_NUMBUF]; | |
1085 | int oom_score_adj = OOM_SCORE_ADJ_MIN; | |
1086 | unsigned long flags; | |
1087 | size_t len; | |
1088 | ||
1089 | if (!task) | |
1090 | return -ESRCH; | |
1091 | if (lock_task_sighand(task, &flags)) { | |
1092 | oom_score_adj = task->signal->oom_score_adj; | |
1093 | unlock_task_sighand(task, &flags); | |
1094 | } | |
1095 | put_task_struct(task); | |
1096 | len = snprintf(buffer, sizeof(buffer), "%d\n", oom_score_adj); | |
1097 | return simple_read_from_buffer(buf, count, ppos, buffer, len); | |
1098 | } | |
1099 | ||
1100 | static ssize_t oom_score_adj_write(struct file *file, const char __user *buf, | |
1101 | size_t count, loff_t *ppos) | |
1102 | { | |
1103 | struct task_struct *task; | |
1104 | char buffer[PROC_NUMBUF]; | |
1105 | unsigned long flags; | |
1106 | long oom_score_adj; | |
1107 | int err; | |
1108 | ||
1109 | memset(buffer, 0, sizeof(buffer)); | |
1110 | if (count > sizeof(buffer) - 1) | |
1111 | count = sizeof(buffer) - 1; | |
1112 | if (copy_from_user(buffer, buf, count)) | |
1113 | return -EFAULT; | |
1114 | ||
1115 | err = strict_strtol(strstrip(buffer), 0, &oom_score_adj); | |
1116 | if (err) | |
1117 | return -EINVAL; | |
1118 | if (oom_score_adj < OOM_SCORE_ADJ_MIN || | |
1119 | oom_score_adj > OOM_SCORE_ADJ_MAX) | |
1120 | return -EINVAL; | |
1121 | ||
1122 | task = get_proc_task(file->f_path.dentry->d_inode); | |
1123 | if (!task) | |
1124 | return -ESRCH; | |
1125 | if (!lock_task_sighand(task, &flags)) { | |
1126 | put_task_struct(task); | |
1127 | return -ESRCH; | |
1128 | } | |
1129 | if (oom_score_adj < task->signal->oom_score_adj && | |
1130 | !capable(CAP_SYS_RESOURCE)) { | |
1131 | unlock_task_sighand(task, &flags); | |
1132 | put_task_struct(task); | |
1133 | return -EACCES; | |
1134 | } | |
1135 | ||
1136 | task->signal->oom_score_adj = oom_score_adj; | |
1137 | /* | |
1138 | * Scale /proc/pid/oom_adj appropriately ensuring that OOM_DISABLE is | |
1139 | * always attainable. | |
1140 | */ | |
1141 | if (task->signal->oom_score_adj == OOM_SCORE_ADJ_MIN) | |
1142 | task->signal->oom_adj = OOM_DISABLE; | |
1143 | else | |
1144 | task->signal->oom_adj = (oom_score_adj * OOM_ADJUST_MAX) / | |
1145 | OOM_SCORE_ADJ_MAX; | |
1146 | unlock_task_sighand(task, &flags); | |
1147 | put_task_struct(task); | |
1148 | return count; | |
1149 | } | |
1150 | ||
1151 | static const struct file_operations proc_oom_score_adj_operations = { | |
1152 | .read = oom_score_adj_read, | |
1153 | .write = oom_score_adj_write, | |
6038f373 | 1154 | .llseek = default_llseek, |
a63d83f4 DR |
1155 | }; |
1156 | ||
1da177e4 LT |
1157 | #ifdef CONFIG_AUDITSYSCALL |
1158 | #define TMPBUFLEN 21 | |
1159 | static ssize_t proc_loginuid_read(struct file * file, char __user * buf, | |
1160 | size_t count, loff_t *ppos) | |
1161 | { | |
2fddfeef | 1162 | struct inode * inode = file->f_path.dentry->d_inode; |
99f89551 | 1163 | struct task_struct *task = get_proc_task(inode); |
1da177e4 LT |
1164 | ssize_t length; |
1165 | char tmpbuf[TMPBUFLEN]; | |
1166 | ||
99f89551 EB |
1167 | if (!task) |
1168 | return -ESRCH; | |
1da177e4 | 1169 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", |
0c11b942 | 1170 | audit_get_loginuid(task)); |
99f89551 | 1171 | put_task_struct(task); |
1da177e4 LT |
1172 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); |
1173 | } | |
1174 | ||
1175 | static ssize_t proc_loginuid_write(struct file * file, const char __user * buf, | |
1176 | size_t count, loff_t *ppos) | |
1177 | { | |
2fddfeef | 1178 | struct inode * inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
1179 | char *page, *tmp; |
1180 | ssize_t length; | |
1da177e4 LT |
1181 | uid_t loginuid; |
1182 | ||
1183 | if (!capable(CAP_AUDIT_CONTROL)) | |
1184 | return -EPERM; | |
1185 | ||
7dc52157 PM |
1186 | rcu_read_lock(); |
1187 | if (current != pid_task(proc_pid(inode), PIDTYPE_PID)) { | |
1188 | rcu_read_unlock(); | |
1da177e4 | 1189 | return -EPERM; |
7dc52157 PM |
1190 | } |
1191 | rcu_read_unlock(); | |
1da177e4 | 1192 | |
e0182909 AV |
1193 | if (count >= PAGE_SIZE) |
1194 | count = PAGE_SIZE - 1; | |
1da177e4 LT |
1195 | |
1196 | if (*ppos != 0) { | |
1197 | /* No partial writes. */ | |
1198 | return -EINVAL; | |
1199 | } | |
e12ba74d | 1200 | page = (char*)__get_free_page(GFP_TEMPORARY); |
1da177e4 LT |
1201 | if (!page) |
1202 | return -ENOMEM; | |
1203 | length = -EFAULT; | |
1204 | if (copy_from_user(page, buf, count)) | |
1205 | goto out_free_page; | |
1206 | ||
e0182909 | 1207 | page[count] = '\0'; |
1da177e4 LT |
1208 | loginuid = simple_strtoul(page, &tmp, 10); |
1209 | if (tmp == page) { | |
1210 | length = -EINVAL; | |
1211 | goto out_free_page; | |
1212 | ||
1213 | } | |
99f89551 | 1214 | length = audit_set_loginuid(current, loginuid); |
1da177e4 LT |
1215 | if (likely(length == 0)) |
1216 | length = count; | |
1217 | ||
1218 | out_free_page: | |
1219 | free_page((unsigned long) page); | |
1220 | return length; | |
1221 | } | |
1222 | ||
00977a59 | 1223 | static const struct file_operations proc_loginuid_operations = { |
1da177e4 LT |
1224 | .read = proc_loginuid_read, |
1225 | .write = proc_loginuid_write, | |
87df8424 | 1226 | .llseek = generic_file_llseek, |
1da177e4 | 1227 | }; |
1e0bd755 EP |
1228 | |
1229 | static ssize_t proc_sessionid_read(struct file * file, char __user * buf, | |
1230 | size_t count, loff_t *ppos) | |
1231 | { | |
1232 | struct inode * inode = file->f_path.dentry->d_inode; | |
1233 | struct task_struct *task = get_proc_task(inode); | |
1234 | ssize_t length; | |
1235 | char tmpbuf[TMPBUFLEN]; | |
1236 | ||
1237 | if (!task) | |
1238 | return -ESRCH; | |
1239 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", | |
1240 | audit_get_sessionid(task)); | |
1241 | put_task_struct(task); | |
1242 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
1243 | } | |
1244 | ||
1245 | static const struct file_operations proc_sessionid_operations = { | |
1246 | .read = proc_sessionid_read, | |
87df8424 | 1247 | .llseek = generic_file_llseek, |
1e0bd755 | 1248 | }; |
1da177e4 LT |
1249 | #endif |
1250 | ||
f4f154fd AM |
1251 | #ifdef CONFIG_FAULT_INJECTION |
1252 | static ssize_t proc_fault_inject_read(struct file * file, char __user * buf, | |
1253 | size_t count, loff_t *ppos) | |
1254 | { | |
1255 | struct task_struct *task = get_proc_task(file->f_dentry->d_inode); | |
1256 | char buffer[PROC_NUMBUF]; | |
1257 | size_t len; | |
1258 | int make_it_fail; | |
f4f154fd AM |
1259 | |
1260 | if (!task) | |
1261 | return -ESRCH; | |
1262 | make_it_fail = task->make_it_fail; | |
1263 | put_task_struct(task); | |
1264 | ||
1265 | len = snprintf(buffer, sizeof(buffer), "%i\n", make_it_fail); | |
0c28f287 AM |
1266 | |
1267 | return simple_read_from_buffer(buf, count, ppos, buffer, len); | |
f4f154fd AM |
1268 | } |
1269 | ||
1270 | static ssize_t proc_fault_inject_write(struct file * file, | |
1271 | const char __user * buf, size_t count, loff_t *ppos) | |
1272 | { | |
1273 | struct task_struct *task; | |
1274 | char buffer[PROC_NUMBUF], *end; | |
1275 | int make_it_fail; | |
1276 | ||
1277 | if (!capable(CAP_SYS_RESOURCE)) | |
1278 | return -EPERM; | |
1279 | memset(buffer, 0, sizeof(buffer)); | |
1280 | if (count > sizeof(buffer) - 1) | |
1281 | count = sizeof(buffer) - 1; | |
1282 | if (copy_from_user(buffer, buf, count)) | |
1283 | return -EFAULT; | |
cba8aafe VL |
1284 | make_it_fail = simple_strtol(strstrip(buffer), &end, 0); |
1285 | if (*end) | |
1286 | return -EINVAL; | |
f4f154fd AM |
1287 | task = get_proc_task(file->f_dentry->d_inode); |
1288 | if (!task) | |
1289 | return -ESRCH; | |
1290 | task->make_it_fail = make_it_fail; | |
1291 | put_task_struct(task); | |
cba8aafe VL |
1292 | |
1293 | return count; | |
f4f154fd AM |
1294 | } |
1295 | ||
00977a59 | 1296 | static const struct file_operations proc_fault_inject_operations = { |
f4f154fd AM |
1297 | .read = proc_fault_inject_read, |
1298 | .write = proc_fault_inject_write, | |
87df8424 | 1299 | .llseek = generic_file_llseek, |
f4f154fd AM |
1300 | }; |
1301 | #endif | |
1302 | ||
9745512c | 1303 | |
43ae34cb IM |
1304 | #ifdef CONFIG_SCHED_DEBUG |
1305 | /* | |
1306 | * Print out various scheduling related per-task fields: | |
1307 | */ | |
1308 | static int sched_show(struct seq_file *m, void *v) | |
1309 | { | |
1310 | struct inode *inode = m->private; | |
1311 | struct task_struct *p; | |
1312 | ||
43ae34cb IM |
1313 | p = get_proc_task(inode); |
1314 | if (!p) | |
1315 | return -ESRCH; | |
1316 | proc_sched_show_task(p, m); | |
1317 | ||
1318 | put_task_struct(p); | |
1319 | ||
1320 | return 0; | |
1321 | } | |
1322 | ||
1323 | static ssize_t | |
1324 | sched_write(struct file *file, const char __user *buf, | |
1325 | size_t count, loff_t *offset) | |
1326 | { | |
1327 | struct inode *inode = file->f_path.dentry->d_inode; | |
1328 | struct task_struct *p; | |
1329 | ||
43ae34cb IM |
1330 | p = get_proc_task(inode); |
1331 | if (!p) | |
1332 | return -ESRCH; | |
1333 | proc_sched_set_task(p); | |
1334 | ||
1335 | put_task_struct(p); | |
1336 | ||
1337 | return count; | |
1338 | } | |
1339 | ||
1340 | static int sched_open(struct inode *inode, struct file *filp) | |
1341 | { | |
1342 | int ret; | |
1343 | ||
1344 | ret = single_open(filp, sched_show, NULL); | |
1345 | if (!ret) { | |
1346 | struct seq_file *m = filp->private_data; | |
1347 | ||
1348 | m->private = inode; | |
1349 | } | |
1350 | return ret; | |
1351 | } | |
1352 | ||
1353 | static const struct file_operations proc_pid_sched_operations = { | |
1354 | .open = sched_open, | |
1355 | .read = seq_read, | |
1356 | .write = sched_write, | |
1357 | .llseek = seq_lseek, | |
5ea473a1 | 1358 | .release = single_release, |
43ae34cb IM |
1359 | }; |
1360 | ||
1361 | #endif | |
1362 | ||
4614a696 JS |
1363 | static ssize_t comm_write(struct file *file, const char __user *buf, |
1364 | size_t count, loff_t *offset) | |
1365 | { | |
1366 | struct inode *inode = file->f_path.dentry->d_inode; | |
1367 | struct task_struct *p; | |
1368 | char buffer[TASK_COMM_LEN]; | |
1369 | ||
1370 | memset(buffer, 0, sizeof(buffer)); | |
1371 | if (count > sizeof(buffer) - 1) | |
1372 | count = sizeof(buffer) - 1; | |
1373 | if (copy_from_user(buffer, buf, count)) | |
1374 | return -EFAULT; | |
1375 | ||
1376 | p = get_proc_task(inode); | |
1377 | if (!p) | |
1378 | return -ESRCH; | |
1379 | ||
1380 | if (same_thread_group(current, p)) | |
1381 | set_task_comm(p, buffer); | |
1382 | else | |
1383 | count = -EINVAL; | |
1384 | ||
1385 | put_task_struct(p); | |
1386 | ||
1387 | return count; | |
1388 | } | |
1389 | ||
1390 | static int comm_show(struct seq_file *m, void *v) | |
1391 | { | |
1392 | struct inode *inode = m->private; | |
1393 | struct task_struct *p; | |
1394 | ||
1395 | p = get_proc_task(inode); | |
1396 | if (!p) | |
1397 | return -ESRCH; | |
1398 | ||
1399 | task_lock(p); | |
1400 | seq_printf(m, "%s\n", p->comm); | |
1401 | task_unlock(p); | |
1402 | ||
1403 | put_task_struct(p); | |
1404 | ||
1405 | return 0; | |
1406 | } | |
1407 | ||
1408 | static int comm_open(struct inode *inode, struct file *filp) | |
1409 | { | |
1410 | int ret; | |
1411 | ||
1412 | ret = single_open(filp, comm_show, NULL); | |
1413 | if (!ret) { | |
1414 | struct seq_file *m = filp->private_data; | |
1415 | ||
1416 | m->private = inode; | |
1417 | } | |
1418 | return ret; | |
1419 | } | |
1420 | ||
1421 | static const struct file_operations proc_pid_set_comm_operations = { | |
1422 | .open = comm_open, | |
1423 | .read = seq_read, | |
1424 | .write = comm_write, | |
1425 | .llseek = seq_lseek, | |
1426 | .release = single_release, | |
1427 | }; | |
1428 | ||
925d1c40 MH |
1429 | /* |
1430 | * We added or removed a vma mapping the executable. The vmas are only mapped | |
1431 | * during exec and are not mapped with the mmap system call. | |
1432 | * Callers must hold down_write() on the mm's mmap_sem for these | |
1433 | */ | |
1434 | void added_exe_file_vma(struct mm_struct *mm) | |
1435 | { | |
1436 | mm->num_exe_file_vmas++; | |
1437 | } | |
1438 | ||
1439 | void removed_exe_file_vma(struct mm_struct *mm) | |
1440 | { | |
1441 | mm->num_exe_file_vmas--; | |
1442 | if ((mm->num_exe_file_vmas == 0) && mm->exe_file){ | |
1443 | fput(mm->exe_file); | |
1444 | mm->exe_file = NULL; | |
1445 | } | |
1446 | ||
1447 | } | |
1448 | ||
1449 | void set_mm_exe_file(struct mm_struct *mm, struct file *new_exe_file) | |
1450 | { | |
1451 | if (new_exe_file) | |
1452 | get_file(new_exe_file); | |
1453 | if (mm->exe_file) | |
1454 | fput(mm->exe_file); | |
1455 | mm->exe_file = new_exe_file; | |
1456 | mm->num_exe_file_vmas = 0; | |
1457 | } | |
1458 | ||
1459 | struct file *get_mm_exe_file(struct mm_struct *mm) | |
1460 | { | |
1461 | struct file *exe_file; | |
1462 | ||
1463 | /* We need mmap_sem to protect against races with removal of | |
1464 | * VM_EXECUTABLE vmas */ | |
1465 | down_read(&mm->mmap_sem); | |
1466 | exe_file = mm->exe_file; | |
1467 | if (exe_file) | |
1468 | get_file(exe_file); | |
1469 | up_read(&mm->mmap_sem); | |
1470 | return exe_file; | |
1471 | } | |
1472 | ||
1473 | void dup_mm_exe_file(struct mm_struct *oldmm, struct mm_struct *newmm) | |
1474 | { | |
1475 | /* It's safe to write the exe_file pointer without exe_file_lock because | |
1476 | * this is called during fork when the task is not yet in /proc */ | |
1477 | newmm->exe_file = get_mm_exe_file(oldmm); | |
1478 | } | |
1479 | ||
1480 | static int proc_exe_link(struct inode *inode, struct path *exe_path) | |
1481 | { | |
1482 | struct task_struct *task; | |
1483 | struct mm_struct *mm; | |
1484 | struct file *exe_file; | |
1485 | ||
1486 | task = get_proc_task(inode); | |
1487 | if (!task) | |
1488 | return -ENOENT; | |
1489 | mm = get_task_mm(task); | |
1490 | put_task_struct(task); | |
1491 | if (!mm) | |
1492 | return -ENOENT; | |
1493 | exe_file = get_mm_exe_file(mm); | |
1494 | mmput(mm); | |
1495 | if (exe_file) { | |
1496 | *exe_path = exe_file->f_path; | |
1497 | path_get(&exe_file->f_path); | |
1498 | fput(exe_file); | |
1499 | return 0; | |
1500 | } else | |
1501 | return -ENOENT; | |
1502 | } | |
1503 | ||
008b150a | 1504 | static void *proc_pid_follow_link(struct dentry *dentry, struct nameidata *nd) |
1da177e4 LT |
1505 | { |
1506 | struct inode *inode = dentry->d_inode; | |
1507 | int error = -EACCES; | |
1508 | ||
1509 | /* We don't need a base pointer in the /proc filesystem */ | |
1d957f9b | 1510 | path_put(&nd->path); |
1da177e4 | 1511 | |
778c1144 EB |
1512 | /* Are we allowed to snoop on the tasks file descriptors? */ |
1513 | if (!proc_fd_access_allowed(inode)) | |
1da177e4 | 1514 | goto out; |
1da177e4 | 1515 | |
3dcd25f3 | 1516 | error = PROC_I(inode)->op.proc_get_link(inode, &nd->path); |
1da177e4 | 1517 | out: |
008b150a | 1518 | return ERR_PTR(error); |
1da177e4 LT |
1519 | } |
1520 | ||
3dcd25f3 | 1521 | static int do_proc_readlink(struct path *path, char __user *buffer, int buflen) |
1da177e4 | 1522 | { |
e12ba74d | 1523 | char *tmp = (char*)__get_free_page(GFP_TEMPORARY); |
3dcd25f3 | 1524 | char *pathname; |
1da177e4 LT |
1525 | int len; |
1526 | ||
1527 | if (!tmp) | |
1528 | return -ENOMEM; | |
0c28f287 | 1529 | |
8df9d1a4 | 1530 | pathname = d_path_with_unreachable(path, tmp, PAGE_SIZE); |
3dcd25f3 JB |
1531 | len = PTR_ERR(pathname); |
1532 | if (IS_ERR(pathname)) | |
1da177e4 | 1533 | goto out; |
3dcd25f3 | 1534 | len = tmp + PAGE_SIZE - 1 - pathname; |
1da177e4 LT |
1535 | |
1536 | if (len > buflen) | |
1537 | len = buflen; | |
3dcd25f3 | 1538 | if (copy_to_user(buffer, pathname, len)) |
1da177e4 LT |
1539 | len = -EFAULT; |
1540 | out: | |
1541 | free_page((unsigned long)tmp); | |
1542 | return len; | |
1543 | } | |
1544 | ||
1545 | static int proc_pid_readlink(struct dentry * dentry, char __user * buffer, int buflen) | |
1546 | { | |
1547 | int error = -EACCES; | |
1548 | struct inode *inode = dentry->d_inode; | |
3dcd25f3 | 1549 | struct path path; |
1da177e4 | 1550 | |
778c1144 EB |
1551 | /* Are we allowed to snoop on the tasks file descriptors? */ |
1552 | if (!proc_fd_access_allowed(inode)) | |
1da177e4 | 1553 | goto out; |
1da177e4 | 1554 | |
3dcd25f3 | 1555 | error = PROC_I(inode)->op.proc_get_link(inode, &path); |
1da177e4 LT |
1556 | if (error) |
1557 | goto out; | |
1558 | ||
3dcd25f3 JB |
1559 | error = do_proc_readlink(&path, buffer, buflen); |
1560 | path_put(&path); | |
1da177e4 | 1561 | out: |
1da177e4 LT |
1562 | return error; |
1563 | } | |
1564 | ||
c5ef1c42 | 1565 | static const struct inode_operations proc_pid_link_inode_operations = { |
1da177e4 | 1566 | .readlink = proc_pid_readlink, |
6d76fa58 LT |
1567 | .follow_link = proc_pid_follow_link, |
1568 | .setattr = proc_setattr, | |
1da177e4 LT |
1569 | }; |
1570 | ||
28a6d671 EB |
1571 | |
1572 | /* building an inode */ | |
1573 | ||
1574 | static int task_dumpable(struct task_struct *task) | |
1da177e4 | 1575 | { |
28a6d671 EB |
1576 | int dumpable = 0; |
1577 | struct mm_struct *mm; | |
1da177e4 | 1578 | |
28a6d671 EB |
1579 | task_lock(task); |
1580 | mm = task->mm; | |
1581 | if (mm) | |
6c5d5238 | 1582 | dumpable = get_dumpable(mm); |
28a6d671 EB |
1583 | task_unlock(task); |
1584 | if(dumpable == 1) | |
1585 | return 1; | |
1586 | return 0; | |
1587 | } | |
1da177e4 | 1588 | |
1da177e4 | 1589 | |
61a28784 | 1590 | static struct inode *proc_pid_make_inode(struct super_block * sb, struct task_struct *task) |
28a6d671 EB |
1591 | { |
1592 | struct inode * inode; | |
1593 | struct proc_inode *ei; | |
c69e8d9c | 1594 | const struct cred *cred; |
1da177e4 | 1595 | |
28a6d671 | 1596 | /* We need a new inode */ |
1da177e4 | 1597 | |
28a6d671 EB |
1598 | inode = new_inode(sb); |
1599 | if (!inode) | |
1600 | goto out; | |
1601 | ||
1602 | /* Common stuff */ | |
1603 | ei = PROC_I(inode); | |
1604 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; | |
28a6d671 EB |
1605 | inode->i_op = &proc_def_inode_operations; |
1606 | ||
1607 | /* | |
1608 | * grab the reference to task. | |
1609 | */ | |
1a657f78 | 1610 | ei->pid = get_task_pid(task, PIDTYPE_PID); |
28a6d671 EB |
1611 | if (!ei->pid) |
1612 | goto out_unlock; | |
1613 | ||
28a6d671 | 1614 | if (task_dumpable(task)) { |
c69e8d9c DH |
1615 | rcu_read_lock(); |
1616 | cred = __task_cred(task); | |
1617 | inode->i_uid = cred->euid; | |
1618 | inode->i_gid = cred->egid; | |
1619 | rcu_read_unlock(); | |
1da177e4 | 1620 | } |
28a6d671 EB |
1621 | security_task_to_inode(task, inode); |
1622 | ||
1da177e4 | 1623 | out: |
28a6d671 EB |
1624 | return inode; |
1625 | ||
1626 | out_unlock: | |
1627 | iput(inode); | |
1628 | return NULL; | |
1da177e4 LT |
1629 | } |
1630 | ||
28a6d671 | 1631 | static int pid_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) |
1da177e4 | 1632 | { |
1da177e4 | 1633 | struct inode *inode = dentry->d_inode; |
28a6d671 | 1634 | struct task_struct *task; |
c69e8d9c DH |
1635 | const struct cred *cred; |
1636 | ||
28a6d671 | 1637 | generic_fillattr(inode, stat); |
1da177e4 | 1638 | |
28a6d671 EB |
1639 | rcu_read_lock(); |
1640 | stat->uid = 0; | |
1641 | stat->gid = 0; | |
1642 | task = pid_task(proc_pid(inode), PIDTYPE_PID); | |
1643 | if (task) { | |
1644 | if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) || | |
1645 | task_dumpable(task)) { | |
c69e8d9c DH |
1646 | cred = __task_cred(task); |
1647 | stat->uid = cred->euid; | |
1648 | stat->gid = cred->egid; | |
1da177e4 LT |
1649 | } |
1650 | } | |
28a6d671 | 1651 | rcu_read_unlock(); |
d6e71144 | 1652 | return 0; |
1da177e4 LT |
1653 | } |
1654 | ||
1da177e4 LT |
1655 | /* dentry stuff */ |
1656 | ||
1657 | /* | |
1658 | * Exceptional case: normally we are not allowed to unhash a busy | |
1659 | * directory. In this case, however, we can do it - no aliasing problems | |
1660 | * due to the way we treat inodes. | |
1661 | * | |
1662 | * Rewrite the inode's ownerships here because the owning task may have | |
1663 | * performed a setuid(), etc. | |
99f89551 EB |
1664 | * |
1665 | * Before the /proc/pid/status file was created the only way to read | |
1666 | * the effective uid of a /process was to stat /proc/pid. Reading | |
1667 | * /proc/pid/status is slow enough that procps and other packages | |
1668 | * kept stating /proc/pid. To keep the rules in /proc simple I have | |
1669 | * made this apply to all per process world readable and executable | |
1670 | * directories. | |
1da177e4 LT |
1671 | */ |
1672 | static int pid_revalidate(struct dentry *dentry, struct nameidata *nd) | |
1673 | { | |
1674 | struct inode *inode = dentry->d_inode; | |
99f89551 | 1675 | struct task_struct *task = get_proc_task(inode); |
c69e8d9c DH |
1676 | const struct cred *cred; |
1677 | ||
99f89551 EB |
1678 | if (task) { |
1679 | if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) || | |
1680 | task_dumpable(task)) { | |
c69e8d9c DH |
1681 | rcu_read_lock(); |
1682 | cred = __task_cred(task); | |
1683 | inode->i_uid = cred->euid; | |
1684 | inode->i_gid = cred->egid; | |
1685 | rcu_read_unlock(); | |
1da177e4 LT |
1686 | } else { |
1687 | inode->i_uid = 0; | |
1688 | inode->i_gid = 0; | |
1689 | } | |
9ee8ab9f | 1690 | inode->i_mode &= ~(S_ISUID | S_ISGID); |
1da177e4 | 1691 | security_task_to_inode(task, inode); |
99f89551 | 1692 | put_task_struct(task); |
1da177e4 LT |
1693 | return 1; |
1694 | } | |
1695 | d_drop(dentry); | |
1696 | return 0; | |
1697 | } | |
1698 | ||
28a6d671 | 1699 | static int pid_delete_dentry(struct dentry * dentry) |
99f89551 | 1700 | { |
28a6d671 EB |
1701 | /* Is the task we represent dead? |
1702 | * If so, then don't put the dentry on the lru list, | |
1703 | * kill it immediately. | |
1704 | */ | |
1705 | return !proc_pid(dentry->d_inode)->tasks[PIDTYPE_PID].first; | |
1706 | } | |
1707 | ||
d72f71eb | 1708 | static const struct dentry_operations pid_dentry_operations = |
28a6d671 EB |
1709 | { |
1710 | .d_revalidate = pid_revalidate, | |
1711 | .d_delete = pid_delete_dentry, | |
1712 | }; | |
1713 | ||
1714 | /* Lookups */ | |
1715 | ||
c5141e6d ED |
1716 | typedef struct dentry *instantiate_t(struct inode *, struct dentry *, |
1717 | struct task_struct *, const void *); | |
61a28784 | 1718 | |
1c0d04c9 EB |
1719 | /* |
1720 | * Fill a directory entry. | |
1721 | * | |
1722 | * If possible create the dcache entry and derive our inode number and | |
1723 | * file type from dcache entry. | |
1724 | * | |
1725 | * Since all of the proc inode numbers are dynamically generated, the inode | |
1726 | * numbers do not exist until the inode is cache. This means creating the | |
1727 | * the dcache entry in readdir is necessary to keep the inode numbers | |
1728 | * reported by readdir in sync with the inode numbers reported | |
1729 | * by stat. | |
1730 | */ | |
61a28784 EB |
1731 | static int proc_fill_cache(struct file *filp, void *dirent, filldir_t filldir, |
1732 | char *name, int len, | |
c5141e6d | 1733 | instantiate_t instantiate, struct task_struct *task, const void *ptr) |
61a28784 | 1734 | { |
2fddfeef | 1735 | struct dentry *child, *dir = filp->f_path.dentry; |
61a28784 EB |
1736 | struct inode *inode; |
1737 | struct qstr qname; | |
1738 | ino_t ino = 0; | |
1739 | unsigned type = DT_UNKNOWN; | |
1740 | ||
1741 | qname.name = name; | |
1742 | qname.len = len; | |
1743 | qname.hash = full_name_hash(name, len); | |
1744 | ||
1745 | child = d_lookup(dir, &qname); | |
1746 | if (!child) { | |
1747 | struct dentry *new; | |
1748 | new = d_alloc(dir, &qname); | |
1749 | if (new) { | |
1750 | child = instantiate(dir->d_inode, new, task, ptr); | |
1751 | if (child) | |
1752 | dput(new); | |
1753 | else | |
1754 | child = new; | |
1755 | } | |
1756 | } | |
1757 | if (!child || IS_ERR(child) || !child->d_inode) | |
1758 | goto end_instantiate; | |
1759 | inode = child->d_inode; | |
1760 | if (inode) { | |
1761 | ino = inode->i_ino; | |
1762 | type = inode->i_mode >> 12; | |
1763 | } | |
1764 | dput(child); | |
1765 | end_instantiate: | |
1766 | if (!ino) | |
1767 | ino = find_inode_number(dir, &qname); | |
1768 | if (!ino) | |
1769 | ino = 1; | |
1770 | return filldir(dirent, name, len, filp->f_pos, ino, type); | |
1771 | } | |
1772 | ||
28a6d671 EB |
1773 | static unsigned name_to_int(struct dentry *dentry) |
1774 | { | |
1775 | const char *name = dentry->d_name.name; | |
1776 | int len = dentry->d_name.len; | |
1777 | unsigned n = 0; | |
1778 | ||
1779 | if (len > 1 && *name == '0') | |
1780 | goto out; | |
1781 | while (len-- > 0) { | |
1782 | unsigned c = *name++ - '0'; | |
1783 | if (c > 9) | |
1784 | goto out; | |
1785 | if (n >= (~0U-9)/10) | |
1786 | goto out; | |
1787 | n *= 10; | |
1788 | n += c; | |
1789 | } | |
1790 | return n; | |
1791 | out: | |
1792 | return ~0U; | |
1793 | } | |
1794 | ||
27932742 MS |
1795 | #define PROC_FDINFO_MAX 64 |
1796 | ||
3dcd25f3 | 1797 | static int proc_fd_info(struct inode *inode, struct path *path, char *info) |
28a6d671 EB |
1798 | { |
1799 | struct task_struct *task = get_proc_task(inode); | |
1800 | struct files_struct *files = NULL; | |
1801 | struct file *file; | |
1802 | int fd = proc_fd(inode); | |
99f89551 | 1803 | |
99f89551 | 1804 | if (task) { |
28a6d671 EB |
1805 | files = get_files_struct(task); |
1806 | put_task_struct(task); | |
1807 | } | |
1808 | if (files) { | |
1809 | /* | |
1810 | * We are not taking a ref to the file structure, so we must | |
1811 | * hold ->file_lock. | |
1812 | */ | |
1813 | spin_lock(&files->file_lock); | |
1814 | file = fcheck_files(files, fd); | |
1815 | if (file) { | |
3dcd25f3 JB |
1816 | if (path) { |
1817 | *path = file->f_path; | |
1818 | path_get(&file->f_path); | |
1819 | } | |
27932742 MS |
1820 | if (info) |
1821 | snprintf(info, PROC_FDINFO_MAX, | |
1822 | "pos:\t%lli\n" | |
1823 | "flags:\t0%o\n", | |
1824 | (long long) file->f_pos, | |
1825 | file->f_flags); | |
28a6d671 EB |
1826 | spin_unlock(&files->file_lock); |
1827 | put_files_struct(files); | |
1828 | return 0; | |
99f89551 | 1829 | } |
28a6d671 EB |
1830 | spin_unlock(&files->file_lock); |
1831 | put_files_struct(files); | |
99f89551 | 1832 | } |
28a6d671 | 1833 | return -ENOENT; |
99f89551 EB |
1834 | } |
1835 | ||
3dcd25f3 | 1836 | static int proc_fd_link(struct inode *inode, struct path *path) |
27932742 | 1837 | { |
3dcd25f3 | 1838 | return proc_fd_info(inode, path, NULL); |
27932742 MS |
1839 | } |
1840 | ||
1da177e4 LT |
1841 | static int tid_fd_revalidate(struct dentry *dentry, struct nameidata *nd) |
1842 | { | |
1843 | struct inode *inode = dentry->d_inode; | |
99f89551 | 1844 | struct task_struct *task = get_proc_task(inode); |
aed7a6c4 | 1845 | int fd = proc_fd(inode); |
1da177e4 | 1846 | struct files_struct *files; |
c69e8d9c | 1847 | const struct cred *cred; |
1da177e4 | 1848 | |
99f89551 EB |
1849 | if (task) { |
1850 | files = get_files_struct(task); | |
1851 | if (files) { | |
1852 | rcu_read_lock(); | |
1853 | if (fcheck_files(files, fd)) { | |
1854 | rcu_read_unlock(); | |
1855 | put_files_struct(files); | |
1856 | if (task_dumpable(task)) { | |
c69e8d9c DH |
1857 | rcu_read_lock(); |
1858 | cred = __task_cred(task); | |
1859 | inode->i_uid = cred->euid; | |
1860 | inode->i_gid = cred->egid; | |
1861 | rcu_read_unlock(); | |
99f89551 EB |
1862 | } else { |
1863 | inode->i_uid = 0; | |
1864 | inode->i_gid = 0; | |
1865 | } | |
9ee8ab9f | 1866 | inode->i_mode &= ~(S_ISUID | S_ISGID); |
99f89551 EB |
1867 | security_task_to_inode(task, inode); |
1868 | put_task_struct(task); | |
1869 | return 1; | |
1870 | } | |
b835996f | 1871 | rcu_read_unlock(); |
1da177e4 | 1872 | put_files_struct(files); |
1da177e4 | 1873 | } |
99f89551 | 1874 | put_task_struct(task); |
1da177e4 LT |
1875 | } |
1876 | d_drop(dentry); | |
1877 | return 0; | |
1878 | } | |
1879 | ||
d72f71eb | 1880 | static const struct dentry_operations tid_fd_dentry_operations = |
1da177e4 LT |
1881 | { |
1882 | .d_revalidate = tid_fd_revalidate, | |
1883 | .d_delete = pid_delete_dentry, | |
1884 | }; | |
1885 | ||
444ceed8 | 1886 | static struct dentry *proc_fd_instantiate(struct inode *dir, |
c5141e6d | 1887 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
1da177e4 | 1888 | { |
c5141e6d | 1889 | unsigned fd = *(const unsigned *)ptr; |
444ceed8 EB |
1890 | struct file *file; |
1891 | struct files_struct *files; | |
1892 | struct inode *inode; | |
1893 | struct proc_inode *ei; | |
1894 | struct dentry *error = ERR_PTR(-ENOENT); | |
1da177e4 | 1895 | |
61a28784 | 1896 | inode = proc_pid_make_inode(dir->i_sb, task); |
1da177e4 LT |
1897 | if (!inode) |
1898 | goto out; | |
1899 | ei = PROC_I(inode); | |
aed7a6c4 | 1900 | ei->fd = fd; |
1da177e4 LT |
1901 | files = get_files_struct(task); |
1902 | if (!files) | |
444ceed8 | 1903 | goto out_iput; |
1da177e4 | 1904 | inode->i_mode = S_IFLNK; |
ca99c1da DS |
1905 | |
1906 | /* | |
1907 | * We are not taking a ref to the file structure, so we must | |
1908 | * hold ->file_lock. | |
1909 | */ | |
1910 | spin_lock(&files->file_lock); | |
1da177e4 LT |
1911 | file = fcheck_files(files, fd); |
1912 | if (!file) | |
444ceed8 | 1913 | goto out_unlock; |
aeb5d727 | 1914 | if (file->f_mode & FMODE_READ) |
1da177e4 | 1915 | inode->i_mode |= S_IRUSR | S_IXUSR; |
aeb5d727 | 1916 | if (file->f_mode & FMODE_WRITE) |
1da177e4 | 1917 | inode->i_mode |= S_IWUSR | S_IXUSR; |
ca99c1da | 1918 | spin_unlock(&files->file_lock); |
1da177e4 | 1919 | put_files_struct(files); |
444ceed8 | 1920 | |
1da177e4 LT |
1921 | inode->i_op = &proc_pid_link_inode_operations; |
1922 | inode->i_size = 64; | |
1923 | ei->op.proc_get_link = proc_fd_link; | |
1924 | dentry->d_op = &tid_fd_dentry_operations; | |
1925 | d_add(dentry, inode); | |
cd6a3ce9 EB |
1926 | /* Close the race of the process dying before we return the dentry */ |
1927 | if (tid_fd_revalidate(dentry, NULL)) | |
444ceed8 | 1928 | error = NULL; |
1da177e4 | 1929 | |
444ceed8 EB |
1930 | out: |
1931 | return error; | |
1932 | out_unlock: | |
ca99c1da | 1933 | spin_unlock(&files->file_lock); |
1da177e4 | 1934 | put_files_struct(files); |
444ceed8 | 1935 | out_iput: |
1da177e4 | 1936 | iput(inode); |
cd6a3ce9 | 1937 | goto out; |
1da177e4 LT |
1938 | } |
1939 | ||
27932742 MS |
1940 | static struct dentry *proc_lookupfd_common(struct inode *dir, |
1941 | struct dentry *dentry, | |
1942 | instantiate_t instantiate) | |
444ceed8 EB |
1943 | { |
1944 | struct task_struct *task = get_proc_task(dir); | |
1945 | unsigned fd = name_to_int(dentry); | |
1946 | struct dentry *result = ERR_PTR(-ENOENT); | |
1947 | ||
1948 | if (!task) | |
1949 | goto out_no_task; | |
1950 | if (fd == ~0U) | |
1951 | goto out; | |
1952 | ||
27932742 | 1953 | result = instantiate(dir, dentry, task, &fd); |
444ceed8 EB |
1954 | out: |
1955 | put_task_struct(task); | |
1956 | out_no_task: | |
1957 | return result; | |
1958 | } | |
1959 | ||
27932742 MS |
1960 | static int proc_readfd_common(struct file * filp, void * dirent, |
1961 | filldir_t filldir, instantiate_t instantiate) | |
28a6d671 | 1962 | { |
2fddfeef | 1963 | struct dentry *dentry = filp->f_path.dentry; |
28a6d671 EB |
1964 | struct inode *inode = dentry->d_inode; |
1965 | struct task_struct *p = get_proc_task(inode); | |
457c2510 | 1966 | unsigned int fd, ino; |
28a6d671 | 1967 | int retval; |
28a6d671 | 1968 | struct files_struct * files; |
1da177e4 | 1969 | |
28a6d671 EB |
1970 | retval = -ENOENT; |
1971 | if (!p) | |
1972 | goto out_no_task; | |
1973 | retval = 0; | |
28a6d671 EB |
1974 | |
1975 | fd = filp->f_pos; | |
1976 | switch (fd) { | |
1977 | case 0: | |
1978 | if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0) | |
1979 | goto out; | |
1980 | filp->f_pos++; | |
1981 | case 1: | |
1982 | ino = parent_ino(dentry); | |
1983 | if (filldir(dirent, "..", 2, 1, ino, DT_DIR) < 0) | |
1984 | goto out; | |
1985 | filp->f_pos++; | |
1986 | default: | |
1987 | files = get_files_struct(p); | |
1988 | if (!files) | |
1989 | goto out; | |
1990 | rcu_read_lock(); | |
28a6d671 | 1991 | for (fd = filp->f_pos-2; |
9b4f526c | 1992 | fd < files_fdtable(files)->max_fds; |
28a6d671 | 1993 | fd++, filp->f_pos++) { |
27932742 MS |
1994 | char name[PROC_NUMBUF]; |
1995 | int len; | |
28a6d671 EB |
1996 | |
1997 | if (!fcheck_files(files, fd)) | |
1998 | continue; | |
1999 | rcu_read_unlock(); | |
2000 | ||
27932742 MS |
2001 | len = snprintf(name, sizeof(name), "%d", fd); |
2002 | if (proc_fill_cache(filp, dirent, filldir, | |
2003 | name, len, instantiate, | |
2004 | p, &fd) < 0) { | |
28a6d671 EB |
2005 | rcu_read_lock(); |
2006 | break; | |
2007 | } | |
2008 | rcu_read_lock(); | |
2009 | } | |
2010 | rcu_read_unlock(); | |
2011 | put_files_struct(files); | |
2012 | } | |
2013 | out: | |
2014 | put_task_struct(p); | |
2015 | out_no_task: | |
2016 | return retval; | |
2017 | } | |
2018 | ||
27932742 MS |
2019 | static struct dentry *proc_lookupfd(struct inode *dir, struct dentry *dentry, |
2020 | struct nameidata *nd) | |
2021 | { | |
2022 | return proc_lookupfd_common(dir, dentry, proc_fd_instantiate); | |
2023 | } | |
2024 | ||
2025 | static int proc_readfd(struct file *filp, void *dirent, filldir_t filldir) | |
2026 | { | |
2027 | return proc_readfd_common(filp, dirent, filldir, proc_fd_instantiate); | |
2028 | } | |
2029 | ||
2030 | static ssize_t proc_fdinfo_read(struct file *file, char __user *buf, | |
2031 | size_t len, loff_t *ppos) | |
2032 | { | |
2033 | char tmp[PROC_FDINFO_MAX]; | |
3dcd25f3 | 2034 | int err = proc_fd_info(file->f_path.dentry->d_inode, NULL, tmp); |
27932742 MS |
2035 | if (!err) |
2036 | err = simple_read_from_buffer(buf, len, ppos, tmp, strlen(tmp)); | |
2037 | return err; | |
2038 | } | |
2039 | ||
2040 | static const struct file_operations proc_fdinfo_file_operations = { | |
87df8424 | 2041 | .open = nonseekable_open, |
27932742 | 2042 | .read = proc_fdinfo_read, |
6038f373 | 2043 | .llseek = no_llseek, |
27932742 MS |
2044 | }; |
2045 | ||
00977a59 | 2046 | static const struct file_operations proc_fd_operations = { |
28a6d671 EB |
2047 | .read = generic_read_dir, |
2048 | .readdir = proc_readfd, | |
6038f373 | 2049 | .llseek = default_llseek, |
1da177e4 LT |
2050 | }; |
2051 | ||
8948e11f AD |
2052 | /* |
2053 | * /proc/pid/fd needs a special permission handler so that a process can still | |
2054 | * access /proc/self/fd after it has executed a setuid(). | |
2055 | */ | |
e6305c43 | 2056 | static int proc_fd_permission(struct inode *inode, int mask) |
8948e11f AD |
2057 | { |
2058 | int rv; | |
2059 | ||
2060 | rv = generic_permission(inode, mask, NULL); | |
2061 | if (rv == 0) | |
2062 | return 0; | |
2063 | if (task_pid(current) == proc_pid(inode)) | |
2064 | rv = 0; | |
2065 | return rv; | |
2066 | } | |
2067 | ||
1da177e4 LT |
2068 | /* |
2069 | * proc directories can do almost nothing.. | |
2070 | */ | |
c5ef1c42 | 2071 | static const struct inode_operations proc_fd_inode_operations = { |
1da177e4 | 2072 | .lookup = proc_lookupfd, |
8948e11f | 2073 | .permission = proc_fd_permission, |
6d76fa58 | 2074 | .setattr = proc_setattr, |
1da177e4 LT |
2075 | }; |
2076 | ||
27932742 MS |
2077 | static struct dentry *proc_fdinfo_instantiate(struct inode *dir, |
2078 | struct dentry *dentry, struct task_struct *task, const void *ptr) | |
2079 | { | |
2080 | unsigned fd = *(unsigned *)ptr; | |
2081 | struct inode *inode; | |
2082 | struct proc_inode *ei; | |
2083 | struct dentry *error = ERR_PTR(-ENOENT); | |
2084 | ||
2085 | inode = proc_pid_make_inode(dir->i_sb, task); | |
2086 | if (!inode) | |
2087 | goto out; | |
2088 | ei = PROC_I(inode); | |
2089 | ei->fd = fd; | |
2090 | inode->i_mode = S_IFREG | S_IRUSR; | |
2091 | inode->i_fop = &proc_fdinfo_file_operations; | |
2092 | dentry->d_op = &tid_fd_dentry_operations; | |
2093 | d_add(dentry, inode); | |
2094 | /* Close the race of the process dying before we return the dentry */ | |
2095 | if (tid_fd_revalidate(dentry, NULL)) | |
2096 | error = NULL; | |
2097 | ||
2098 | out: | |
2099 | return error; | |
2100 | } | |
2101 | ||
2102 | static struct dentry *proc_lookupfdinfo(struct inode *dir, | |
2103 | struct dentry *dentry, | |
2104 | struct nameidata *nd) | |
2105 | { | |
2106 | return proc_lookupfd_common(dir, dentry, proc_fdinfo_instantiate); | |
2107 | } | |
2108 | ||
2109 | static int proc_readfdinfo(struct file *filp, void *dirent, filldir_t filldir) | |
2110 | { | |
2111 | return proc_readfd_common(filp, dirent, filldir, | |
2112 | proc_fdinfo_instantiate); | |
2113 | } | |
2114 | ||
2115 | static const struct file_operations proc_fdinfo_operations = { | |
2116 | .read = generic_read_dir, | |
2117 | .readdir = proc_readfdinfo, | |
6038f373 | 2118 | .llseek = default_llseek, |
27932742 MS |
2119 | }; |
2120 | ||
2121 | /* | |
2122 | * proc directories can do almost nothing.. | |
2123 | */ | |
2124 | static const struct inode_operations proc_fdinfo_inode_operations = { | |
2125 | .lookup = proc_lookupfdinfo, | |
2126 | .setattr = proc_setattr, | |
2127 | }; | |
2128 | ||
2129 | ||
444ceed8 | 2130 | static struct dentry *proc_pident_instantiate(struct inode *dir, |
c5141e6d | 2131 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
444ceed8 | 2132 | { |
c5141e6d | 2133 | const struct pid_entry *p = ptr; |
444ceed8 EB |
2134 | struct inode *inode; |
2135 | struct proc_inode *ei; | |
bd6daba9 | 2136 | struct dentry *error = ERR_PTR(-ENOENT); |
444ceed8 | 2137 | |
61a28784 | 2138 | inode = proc_pid_make_inode(dir->i_sb, task); |
444ceed8 EB |
2139 | if (!inode) |
2140 | goto out; | |
2141 | ||
2142 | ei = PROC_I(inode); | |
2143 | inode->i_mode = p->mode; | |
2144 | if (S_ISDIR(inode->i_mode)) | |
2145 | inode->i_nlink = 2; /* Use getattr to fix if necessary */ | |
2146 | if (p->iop) | |
2147 | inode->i_op = p->iop; | |
2148 | if (p->fop) | |
2149 | inode->i_fop = p->fop; | |
2150 | ei->op = p->op; | |
2151 | dentry->d_op = &pid_dentry_operations; | |
2152 | d_add(dentry, inode); | |
2153 | /* Close the race of the process dying before we return the dentry */ | |
2154 | if (pid_revalidate(dentry, NULL)) | |
2155 | error = NULL; | |
2156 | out: | |
2157 | return error; | |
2158 | } | |
2159 | ||
1da177e4 LT |
2160 | static struct dentry *proc_pident_lookup(struct inode *dir, |
2161 | struct dentry *dentry, | |
c5141e6d | 2162 | const struct pid_entry *ents, |
7bcd6b0e | 2163 | unsigned int nents) |
1da177e4 | 2164 | { |
cd6a3ce9 | 2165 | struct dentry *error; |
99f89551 | 2166 | struct task_struct *task = get_proc_task(dir); |
c5141e6d | 2167 | const struct pid_entry *p, *last; |
1da177e4 | 2168 | |
cd6a3ce9 | 2169 | error = ERR_PTR(-ENOENT); |
1da177e4 | 2170 | |
99f89551 EB |
2171 | if (!task) |
2172 | goto out_no_task; | |
1da177e4 | 2173 | |
20cdc894 EB |
2174 | /* |
2175 | * Yes, it does not scale. And it should not. Don't add | |
2176 | * new entries into /proc/<tgid>/ without very good reasons. | |
2177 | */ | |
7bcd6b0e EB |
2178 | last = &ents[nents - 1]; |
2179 | for (p = ents; p <= last; p++) { | |
1da177e4 LT |
2180 | if (p->len != dentry->d_name.len) |
2181 | continue; | |
2182 | if (!memcmp(dentry->d_name.name, p->name, p->len)) | |
2183 | break; | |
2184 | } | |
7bcd6b0e | 2185 | if (p > last) |
1da177e4 LT |
2186 | goto out; |
2187 | ||
444ceed8 | 2188 | error = proc_pident_instantiate(dir, dentry, task, p); |
1da177e4 | 2189 | out: |
99f89551 EB |
2190 | put_task_struct(task); |
2191 | out_no_task: | |
cd6a3ce9 | 2192 | return error; |
1da177e4 LT |
2193 | } |
2194 | ||
c5141e6d ED |
2195 | static int proc_pident_fill_cache(struct file *filp, void *dirent, |
2196 | filldir_t filldir, struct task_struct *task, const struct pid_entry *p) | |
61a28784 EB |
2197 | { |
2198 | return proc_fill_cache(filp, dirent, filldir, p->name, p->len, | |
2199 | proc_pident_instantiate, task, p); | |
2200 | } | |
2201 | ||
28a6d671 EB |
2202 | static int proc_pident_readdir(struct file *filp, |
2203 | void *dirent, filldir_t filldir, | |
c5141e6d | 2204 | const struct pid_entry *ents, unsigned int nents) |
28a6d671 EB |
2205 | { |
2206 | int i; | |
2fddfeef | 2207 | struct dentry *dentry = filp->f_path.dentry; |
28a6d671 EB |
2208 | struct inode *inode = dentry->d_inode; |
2209 | struct task_struct *task = get_proc_task(inode); | |
c5141e6d | 2210 | const struct pid_entry *p, *last; |
28a6d671 EB |
2211 | ino_t ino; |
2212 | int ret; | |
2213 | ||
2214 | ret = -ENOENT; | |
2215 | if (!task) | |
61a28784 | 2216 | goto out_no_task; |
28a6d671 EB |
2217 | |
2218 | ret = 0; | |
28a6d671 EB |
2219 | i = filp->f_pos; |
2220 | switch (i) { | |
2221 | case 0: | |
2222 | ino = inode->i_ino; | |
2223 | if (filldir(dirent, ".", 1, i, ino, DT_DIR) < 0) | |
2224 | goto out; | |
2225 | i++; | |
2226 | filp->f_pos++; | |
2227 | /* fall through */ | |
2228 | case 1: | |
2229 | ino = parent_ino(dentry); | |
2230 | if (filldir(dirent, "..", 2, i, ino, DT_DIR) < 0) | |
2231 | goto out; | |
2232 | i++; | |
2233 | filp->f_pos++; | |
2234 | /* fall through */ | |
2235 | default: | |
2236 | i -= 2; | |
2237 | if (i >= nents) { | |
2238 | ret = 1; | |
2239 | goto out; | |
2240 | } | |
2241 | p = ents + i; | |
7bcd6b0e EB |
2242 | last = &ents[nents - 1]; |
2243 | while (p <= last) { | |
61a28784 | 2244 | if (proc_pident_fill_cache(filp, dirent, filldir, task, p) < 0) |
28a6d671 EB |
2245 | goto out; |
2246 | filp->f_pos++; | |
2247 | p++; | |
2248 | } | |
2249 | } | |
2250 | ||
2251 | ret = 1; | |
2252 | out: | |
61a28784 EB |
2253 | put_task_struct(task); |
2254 | out_no_task: | |
28a6d671 | 2255 | return ret; |
1da177e4 LT |
2256 | } |
2257 | ||
28a6d671 EB |
2258 | #ifdef CONFIG_SECURITY |
2259 | static ssize_t proc_pid_attr_read(struct file * file, char __user * buf, | |
2260 | size_t count, loff_t *ppos) | |
2261 | { | |
2fddfeef | 2262 | struct inode * inode = file->f_path.dentry->d_inode; |
04ff9708 | 2263 | char *p = NULL; |
28a6d671 EB |
2264 | ssize_t length; |
2265 | struct task_struct *task = get_proc_task(inode); | |
2266 | ||
28a6d671 | 2267 | if (!task) |
04ff9708 | 2268 | return -ESRCH; |
28a6d671 EB |
2269 | |
2270 | length = security_getprocattr(task, | |
2fddfeef | 2271 | (char*)file->f_path.dentry->d_name.name, |
04ff9708 | 2272 | &p); |
28a6d671 | 2273 | put_task_struct(task); |
04ff9708 AV |
2274 | if (length > 0) |
2275 | length = simple_read_from_buffer(buf, count, ppos, p, length); | |
2276 | kfree(p); | |
28a6d671 | 2277 | return length; |
1da177e4 LT |
2278 | } |
2279 | ||
28a6d671 EB |
2280 | static ssize_t proc_pid_attr_write(struct file * file, const char __user * buf, |
2281 | size_t count, loff_t *ppos) | |
2282 | { | |
2fddfeef | 2283 | struct inode * inode = file->f_path.dentry->d_inode; |
28a6d671 EB |
2284 | char *page; |
2285 | ssize_t length; | |
2286 | struct task_struct *task = get_proc_task(inode); | |
2287 | ||
2288 | length = -ESRCH; | |
2289 | if (!task) | |
2290 | goto out_no_task; | |
2291 | if (count > PAGE_SIZE) | |
2292 | count = PAGE_SIZE; | |
2293 | ||
2294 | /* No partial writes. */ | |
2295 | length = -EINVAL; | |
2296 | if (*ppos != 0) | |
2297 | goto out; | |
2298 | ||
2299 | length = -ENOMEM; | |
e12ba74d | 2300 | page = (char*)__get_free_page(GFP_TEMPORARY); |
28a6d671 EB |
2301 | if (!page) |
2302 | goto out; | |
2303 | ||
2304 | length = -EFAULT; | |
2305 | if (copy_from_user(page, buf, count)) | |
2306 | goto out_free; | |
2307 | ||
107db7c7 DH |
2308 | /* Guard against adverse ptrace interaction */ |
2309 | length = mutex_lock_interruptible(&task->cred_guard_mutex); | |
2310 | if (length < 0) | |
2311 | goto out_free; | |
2312 | ||
28a6d671 | 2313 | length = security_setprocattr(task, |
2fddfeef | 2314 | (char*)file->f_path.dentry->d_name.name, |
28a6d671 | 2315 | (void*)page, count); |
107db7c7 | 2316 | mutex_unlock(&task->cred_guard_mutex); |
28a6d671 EB |
2317 | out_free: |
2318 | free_page((unsigned long) page); | |
2319 | out: | |
2320 | put_task_struct(task); | |
2321 | out_no_task: | |
2322 | return length; | |
2323 | } | |
2324 | ||
00977a59 | 2325 | static const struct file_operations proc_pid_attr_operations = { |
28a6d671 EB |
2326 | .read = proc_pid_attr_read, |
2327 | .write = proc_pid_attr_write, | |
87df8424 | 2328 | .llseek = generic_file_llseek, |
28a6d671 EB |
2329 | }; |
2330 | ||
c5141e6d | 2331 | static const struct pid_entry attr_dir_stuff[] = { |
631f9c18 AD |
2332 | REG("current", S_IRUGO|S_IWUGO, proc_pid_attr_operations), |
2333 | REG("prev", S_IRUGO, proc_pid_attr_operations), | |
2334 | REG("exec", S_IRUGO|S_IWUGO, proc_pid_attr_operations), | |
2335 | REG("fscreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations), | |
2336 | REG("keycreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations), | |
2337 | REG("sockcreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations), | |
28a6d671 EB |
2338 | }; |
2339 | ||
72d9dcfc | 2340 | static int proc_attr_dir_readdir(struct file * filp, |
28a6d671 EB |
2341 | void * dirent, filldir_t filldir) |
2342 | { | |
2343 | return proc_pident_readdir(filp,dirent,filldir, | |
72d9dcfc | 2344 | attr_dir_stuff,ARRAY_SIZE(attr_dir_stuff)); |
28a6d671 EB |
2345 | } |
2346 | ||
00977a59 | 2347 | static const struct file_operations proc_attr_dir_operations = { |
1da177e4 | 2348 | .read = generic_read_dir, |
72d9dcfc | 2349 | .readdir = proc_attr_dir_readdir, |
6038f373 | 2350 | .llseek = default_llseek, |
1da177e4 LT |
2351 | }; |
2352 | ||
72d9dcfc | 2353 | static struct dentry *proc_attr_dir_lookup(struct inode *dir, |
28a6d671 EB |
2354 | struct dentry *dentry, struct nameidata *nd) |
2355 | { | |
7bcd6b0e EB |
2356 | return proc_pident_lookup(dir, dentry, |
2357 | attr_dir_stuff, ARRAY_SIZE(attr_dir_stuff)); | |
28a6d671 EB |
2358 | } |
2359 | ||
c5ef1c42 | 2360 | static const struct inode_operations proc_attr_dir_inode_operations = { |
72d9dcfc | 2361 | .lookup = proc_attr_dir_lookup, |
99f89551 | 2362 | .getattr = pid_getattr, |
6d76fa58 | 2363 | .setattr = proc_setattr, |
1da177e4 LT |
2364 | }; |
2365 | ||
28a6d671 EB |
2366 | #endif |
2367 | ||
698ba7b5 | 2368 | #ifdef CONFIG_ELF_CORE |
3cb4a0bb KH |
2369 | static ssize_t proc_coredump_filter_read(struct file *file, char __user *buf, |
2370 | size_t count, loff_t *ppos) | |
2371 | { | |
2372 | struct task_struct *task = get_proc_task(file->f_dentry->d_inode); | |
2373 | struct mm_struct *mm; | |
2374 | char buffer[PROC_NUMBUF]; | |
2375 | size_t len; | |
2376 | int ret; | |
2377 | ||
2378 | if (!task) | |
2379 | return -ESRCH; | |
2380 | ||
2381 | ret = 0; | |
2382 | mm = get_task_mm(task); | |
2383 | if (mm) { | |
2384 | len = snprintf(buffer, sizeof(buffer), "%08lx\n", | |
2385 | ((mm->flags & MMF_DUMP_FILTER_MASK) >> | |
2386 | MMF_DUMP_FILTER_SHIFT)); | |
2387 | mmput(mm); | |
2388 | ret = simple_read_from_buffer(buf, count, ppos, buffer, len); | |
2389 | } | |
2390 | ||
2391 | put_task_struct(task); | |
2392 | ||
2393 | return ret; | |
2394 | } | |
2395 | ||
2396 | static ssize_t proc_coredump_filter_write(struct file *file, | |
2397 | const char __user *buf, | |
2398 | size_t count, | |
2399 | loff_t *ppos) | |
2400 | { | |
2401 | struct task_struct *task; | |
2402 | struct mm_struct *mm; | |
2403 | char buffer[PROC_NUMBUF], *end; | |
2404 | unsigned int val; | |
2405 | int ret; | |
2406 | int i; | |
2407 | unsigned long mask; | |
2408 | ||
2409 | ret = -EFAULT; | |
2410 | memset(buffer, 0, sizeof(buffer)); | |
2411 | if (count > sizeof(buffer) - 1) | |
2412 | count = sizeof(buffer) - 1; | |
2413 | if (copy_from_user(buffer, buf, count)) | |
2414 | goto out_no_task; | |
2415 | ||
2416 | ret = -EINVAL; | |
2417 | val = (unsigned int)simple_strtoul(buffer, &end, 0); | |
2418 | if (*end == '\n') | |
2419 | end++; | |
2420 | if (end - buffer == 0) | |
2421 | goto out_no_task; | |
2422 | ||
2423 | ret = -ESRCH; | |
2424 | task = get_proc_task(file->f_dentry->d_inode); | |
2425 | if (!task) | |
2426 | goto out_no_task; | |
2427 | ||
2428 | ret = end - buffer; | |
2429 | mm = get_task_mm(task); | |
2430 | if (!mm) | |
2431 | goto out_no_mm; | |
2432 | ||
2433 | for (i = 0, mask = 1; i < MMF_DUMP_FILTER_BITS; i++, mask <<= 1) { | |
2434 | if (val & mask) | |
2435 | set_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags); | |
2436 | else | |
2437 | clear_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags); | |
2438 | } | |
2439 | ||
2440 | mmput(mm); | |
2441 | out_no_mm: | |
2442 | put_task_struct(task); | |
2443 | out_no_task: | |
2444 | return ret; | |
2445 | } | |
2446 | ||
2447 | static const struct file_operations proc_coredump_filter_operations = { | |
2448 | .read = proc_coredump_filter_read, | |
2449 | .write = proc_coredump_filter_write, | |
87df8424 | 2450 | .llseek = generic_file_llseek, |
3cb4a0bb KH |
2451 | }; |
2452 | #endif | |
2453 | ||
28a6d671 EB |
2454 | /* |
2455 | * /proc/self: | |
2456 | */ | |
2457 | static int proc_self_readlink(struct dentry *dentry, char __user *buffer, | |
2458 | int buflen) | |
2459 | { | |
488e5bc4 | 2460 | struct pid_namespace *ns = dentry->d_sb->s_fs_info; |
b55fcb22 | 2461 | pid_t tgid = task_tgid_nr_ns(current, ns); |
28a6d671 | 2462 | char tmp[PROC_NUMBUF]; |
b55fcb22 | 2463 | if (!tgid) |
488e5bc4 | 2464 | return -ENOENT; |
b55fcb22 | 2465 | sprintf(tmp, "%d", tgid); |
28a6d671 EB |
2466 | return vfs_readlink(dentry,buffer,buflen,tmp); |
2467 | } | |
2468 | ||
2469 | static void *proc_self_follow_link(struct dentry *dentry, struct nameidata *nd) | |
2470 | { | |
488e5bc4 | 2471 | struct pid_namespace *ns = dentry->d_sb->s_fs_info; |
b55fcb22 | 2472 | pid_t tgid = task_tgid_nr_ns(current, ns); |
7fee4868 AV |
2473 | char *name = ERR_PTR(-ENOENT); |
2474 | if (tgid) { | |
2475 | name = __getname(); | |
2476 | if (!name) | |
2477 | name = ERR_PTR(-ENOMEM); | |
2478 | else | |
2479 | sprintf(name, "%d", tgid); | |
2480 | } | |
2481 | nd_set_link(nd, name); | |
2482 | return NULL; | |
2483 | } | |
2484 | ||
2485 | static void proc_self_put_link(struct dentry *dentry, struct nameidata *nd, | |
2486 | void *cookie) | |
2487 | { | |
2488 | char *s = nd_get_link(nd); | |
2489 | if (!IS_ERR(s)) | |
2490 | __putname(s); | |
28a6d671 EB |
2491 | } |
2492 | ||
c5ef1c42 | 2493 | static const struct inode_operations proc_self_inode_operations = { |
28a6d671 EB |
2494 | .readlink = proc_self_readlink, |
2495 | .follow_link = proc_self_follow_link, | |
7fee4868 | 2496 | .put_link = proc_self_put_link, |
28a6d671 EB |
2497 | }; |
2498 | ||
801199ce EB |
2499 | /* |
2500 | * proc base | |
2501 | * | |
2502 | * These are the directory entries in the root directory of /proc | |
2503 | * that properly belong to the /proc filesystem, as they describe | |
2504 | * describe something that is process related. | |
2505 | */ | |
c5141e6d | 2506 | static const struct pid_entry proc_base_stuff[] = { |
61a28784 | 2507 | NOD("self", S_IFLNK|S_IRWXUGO, |
801199ce | 2508 | &proc_self_inode_operations, NULL, {}), |
801199ce EB |
2509 | }; |
2510 | ||
2511 | /* | |
2512 | * Exceptional case: normally we are not allowed to unhash a busy | |
2513 | * directory. In this case, however, we can do it - no aliasing problems | |
2514 | * due to the way we treat inodes. | |
2515 | */ | |
2516 | static int proc_base_revalidate(struct dentry *dentry, struct nameidata *nd) | |
2517 | { | |
2518 | struct inode *inode = dentry->d_inode; | |
2519 | struct task_struct *task = get_proc_task(inode); | |
2520 | if (task) { | |
2521 | put_task_struct(task); | |
2522 | return 1; | |
2523 | } | |
2524 | d_drop(dentry); | |
2525 | return 0; | |
2526 | } | |
2527 | ||
d72f71eb | 2528 | static const struct dentry_operations proc_base_dentry_operations = |
801199ce EB |
2529 | { |
2530 | .d_revalidate = proc_base_revalidate, | |
2531 | .d_delete = pid_delete_dentry, | |
2532 | }; | |
2533 | ||
444ceed8 | 2534 | static struct dentry *proc_base_instantiate(struct inode *dir, |
c5141e6d | 2535 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
801199ce | 2536 | { |
c5141e6d | 2537 | const struct pid_entry *p = ptr; |
801199ce | 2538 | struct inode *inode; |
801199ce | 2539 | struct proc_inode *ei; |
73d36460 | 2540 | struct dentry *error; |
801199ce EB |
2541 | |
2542 | /* Allocate the inode */ | |
2543 | error = ERR_PTR(-ENOMEM); | |
2544 | inode = new_inode(dir->i_sb); | |
2545 | if (!inode) | |
2546 | goto out; | |
2547 | ||
2548 | /* Initialize the inode */ | |
2549 | ei = PROC_I(inode); | |
2550 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; | |
801199ce EB |
2551 | |
2552 | /* | |
2553 | * grab the reference to the task. | |
2554 | */ | |
1a657f78 | 2555 | ei->pid = get_task_pid(task, PIDTYPE_PID); |
801199ce EB |
2556 | if (!ei->pid) |
2557 | goto out_iput; | |
2558 | ||
801199ce EB |
2559 | inode->i_mode = p->mode; |
2560 | if (S_ISDIR(inode->i_mode)) | |
2561 | inode->i_nlink = 2; | |
2562 | if (S_ISLNK(inode->i_mode)) | |
2563 | inode->i_size = 64; | |
2564 | if (p->iop) | |
2565 | inode->i_op = p->iop; | |
2566 | if (p->fop) | |
2567 | inode->i_fop = p->fop; | |
2568 | ei->op = p->op; | |
2569 | dentry->d_op = &proc_base_dentry_operations; | |
2570 | d_add(dentry, inode); | |
2571 | error = NULL; | |
2572 | out: | |
801199ce EB |
2573 | return error; |
2574 | out_iput: | |
2575 | iput(inode); | |
2576 | goto out; | |
2577 | } | |
2578 | ||
444ceed8 EB |
2579 | static struct dentry *proc_base_lookup(struct inode *dir, struct dentry *dentry) |
2580 | { | |
2581 | struct dentry *error; | |
2582 | struct task_struct *task = get_proc_task(dir); | |
c5141e6d | 2583 | const struct pid_entry *p, *last; |
444ceed8 EB |
2584 | |
2585 | error = ERR_PTR(-ENOENT); | |
2586 | ||
2587 | if (!task) | |
2588 | goto out_no_task; | |
2589 | ||
2590 | /* Lookup the directory entry */ | |
7bcd6b0e EB |
2591 | last = &proc_base_stuff[ARRAY_SIZE(proc_base_stuff) - 1]; |
2592 | for (p = proc_base_stuff; p <= last; p++) { | |
444ceed8 EB |
2593 | if (p->len != dentry->d_name.len) |
2594 | continue; | |
2595 | if (!memcmp(dentry->d_name.name, p->name, p->len)) | |
2596 | break; | |
2597 | } | |
7bcd6b0e | 2598 | if (p > last) |
444ceed8 EB |
2599 | goto out; |
2600 | ||
2601 | error = proc_base_instantiate(dir, dentry, task, p); | |
2602 | ||
2603 | out: | |
2604 | put_task_struct(task); | |
2605 | out_no_task: | |
2606 | return error; | |
2607 | } | |
2608 | ||
c5141e6d ED |
2609 | static int proc_base_fill_cache(struct file *filp, void *dirent, |
2610 | filldir_t filldir, struct task_struct *task, const struct pid_entry *p) | |
61a28784 EB |
2611 | { |
2612 | return proc_fill_cache(filp, dirent, filldir, p->name, p->len, | |
2613 | proc_base_instantiate, task, p); | |
2614 | } | |
2615 | ||
aba76fdb | 2616 | #ifdef CONFIG_TASK_IO_ACCOUNTING |
297c5d92 AR |
2617 | static int do_io_accounting(struct task_struct *task, char *buffer, int whole) |
2618 | { | |
940389b8 | 2619 | struct task_io_accounting acct = task->ioac; |
5995477a AR |
2620 | unsigned long flags; |
2621 | ||
2622 | if (whole && lock_task_sighand(task, &flags)) { | |
2623 | struct task_struct *t = task; | |
2624 | ||
2625 | task_io_accounting_add(&acct, &task->signal->ioac); | |
2626 | while_each_thread(task, t) | |
2627 | task_io_accounting_add(&acct, &t->ioac); | |
2628 | ||
2629 | unlock_task_sighand(task, &flags); | |
297c5d92 | 2630 | } |
aba76fdb AM |
2631 | return sprintf(buffer, |
2632 | "rchar: %llu\n" | |
2633 | "wchar: %llu\n" | |
2634 | "syscr: %llu\n" | |
2635 | "syscw: %llu\n" | |
2636 | "read_bytes: %llu\n" | |
2637 | "write_bytes: %llu\n" | |
2638 | "cancelled_write_bytes: %llu\n", | |
7c44319d AB |
2639 | (unsigned long long)acct.rchar, |
2640 | (unsigned long long)acct.wchar, | |
2641 | (unsigned long long)acct.syscr, | |
2642 | (unsigned long long)acct.syscw, | |
2643 | (unsigned long long)acct.read_bytes, | |
2644 | (unsigned long long)acct.write_bytes, | |
2645 | (unsigned long long)acct.cancelled_write_bytes); | |
297c5d92 AR |
2646 | } |
2647 | ||
2648 | static int proc_tid_io_accounting(struct task_struct *task, char *buffer) | |
2649 | { | |
2650 | return do_io_accounting(task, buffer, 0); | |
aba76fdb | 2651 | } |
297c5d92 AR |
2652 | |
2653 | static int proc_tgid_io_accounting(struct task_struct *task, char *buffer) | |
2654 | { | |
2655 | return do_io_accounting(task, buffer, 1); | |
2656 | } | |
2657 | #endif /* CONFIG_TASK_IO_ACCOUNTING */ | |
aba76fdb | 2658 | |
47830723 KC |
2659 | static int proc_pid_personality(struct seq_file *m, struct pid_namespace *ns, |
2660 | struct pid *pid, struct task_struct *task) | |
2661 | { | |
2662 | seq_printf(m, "%08x\n", task->personality); | |
2663 | return 0; | |
2664 | } | |
2665 | ||
28a6d671 EB |
2666 | /* |
2667 | * Thread groups | |
2668 | */ | |
00977a59 | 2669 | static const struct file_operations proc_task_operations; |
c5ef1c42 | 2670 | static const struct inode_operations proc_task_inode_operations; |
20cdc894 | 2671 | |
c5141e6d | 2672 | static const struct pid_entry tgid_base_stuff[] = { |
631f9c18 AD |
2673 | DIR("task", S_IRUGO|S_IXUGO, proc_task_inode_operations, proc_task_operations), |
2674 | DIR("fd", S_IRUSR|S_IXUSR, proc_fd_inode_operations, proc_fd_operations), | |
2675 | DIR("fdinfo", S_IRUSR|S_IXUSR, proc_fdinfo_inode_operations, proc_fdinfo_operations), | |
b2211a36 | 2676 | #ifdef CONFIG_NET |
631f9c18 | 2677 | DIR("net", S_IRUGO|S_IXUGO, proc_net_inode_operations, proc_net_operations), |
b2211a36 | 2678 | #endif |
631f9c18 AD |
2679 | REG("environ", S_IRUSR, proc_environ_operations), |
2680 | INF("auxv", S_IRUSR, proc_pid_auxv), | |
2681 | ONE("status", S_IRUGO, proc_pid_status), | |
2682 | ONE("personality", S_IRUSR, proc_pid_personality), | |
3036e7b4 | 2683 | INF("limits", S_IRUGO, proc_pid_limits), |
43ae34cb | 2684 | #ifdef CONFIG_SCHED_DEBUG |
631f9c18 | 2685 | REG("sched", S_IRUGO|S_IWUSR, proc_pid_sched_operations), |
ebcb6734 | 2686 | #endif |
4614a696 | 2687 | REG("comm", S_IRUGO|S_IWUSR, proc_pid_set_comm_operations), |
ebcb6734 | 2688 | #ifdef CONFIG_HAVE_ARCH_TRACEHOOK |
631f9c18 | 2689 | INF("syscall", S_IRUSR, proc_pid_syscall), |
43ae34cb | 2690 | #endif |
631f9c18 AD |
2691 | INF("cmdline", S_IRUGO, proc_pid_cmdline), |
2692 | ONE("stat", S_IRUGO, proc_tgid_stat), | |
2693 | ONE("statm", S_IRUGO, proc_pid_statm), | |
2694 | REG("maps", S_IRUGO, proc_maps_operations), | |
28a6d671 | 2695 | #ifdef CONFIG_NUMA |
631f9c18 | 2696 | REG("numa_maps", S_IRUGO, proc_numa_maps_operations), |
28a6d671 | 2697 | #endif |
631f9c18 AD |
2698 | REG("mem", S_IRUSR|S_IWUSR, proc_mem_operations), |
2699 | LNK("cwd", proc_cwd_link), | |
2700 | LNK("root", proc_root_link), | |
2701 | LNK("exe", proc_exe_link), | |
2702 | REG("mounts", S_IRUGO, proc_mounts_operations), | |
2703 | REG("mountinfo", S_IRUGO, proc_mountinfo_operations), | |
2704 | REG("mountstats", S_IRUSR, proc_mountstats_operations), | |
1e883281 | 2705 | #ifdef CONFIG_PROC_PAGE_MONITOR |
631f9c18 AD |
2706 | REG("clear_refs", S_IWUSR, proc_clear_refs_operations), |
2707 | REG("smaps", S_IRUGO, proc_smaps_operations), | |
2708 | REG("pagemap", S_IRUSR, proc_pagemap_operations), | |
28a6d671 EB |
2709 | #endif |
2710 | #ifdef CONFIG_SECURITY | |
631f9c18 | 2711 | DIR("attr", S_IRUGO|S_IXUGO, proc_attr_dir_inode_operations, proc_attr_dir_operations), |
28a6d671 EB |
2712 | #endif |
2713 | #ifdef CONFIG_KALLSYMS | |
631f9c18 | 2714 | INF("wchan", S_IRUGO, proc_pid_wchan), |
28a6d671 | 2715 | #endif |
2ec220e2 KC |
2716 | #ifdef CONFIG_STACKTRACE |
2717 | ONE("stack", S_IRUSR, proc_pid_stack), | |
28a6d671 EB |
2718 | #endif |
2719 | #ifdef CONFIG_SCHEDSTATS | |
631f9c18 | 2720 | INF("schedstat", S_IRUGO, proc_pid_schedstat), |
28a6d671 | 2721 | #endif |
9745512c | 2722 | #ifdef CONFIG_LATENCYTOP |
631f9c18 | 2723 | REG("latency", S_IRUGO, proc_lstats_operations), |
9745512c | 2724 | #endif |
8793d854 | 2725 | #ifdef CONFIG_PROC_PID_CPUSET |
631f9c18 | 2726 | REG("cpuset", S_IRUGO, proc_cpuset_operations), |
a424316c PM |
2727 | #endif |
2728 | #ifdef CONFIG_CGROUPS | |
631f9c18 | 2729 | REG("cgroup", S_IRUGO, proc_cgroup_operations), |
28a6d671 | 2730 | #endif |
631f9c18 AD |
2731 | INF("oom_score", S_IRUGO, proc_oom_score), |
2732 | REG("oom_adj", S_IRUGO|S_IWUSR, proc_oom_adjust_operations), | |
a63d83f4 | 2733 | REG("oom_score_adj", S_IRUGO|S_IWUSR, proc_oom_score_adj_operations), |
28a6d671 | 2734 | #ifdef CONFIG_AUDITSYSCALL |
631f9c18 AD |
2735 | REG("loginuid", S_IWUSR|S_IRUGO, proc_loginuid_operations), |
2736 | REG("sessionid", S_IRUGO, proc_sessionid_operations), | |
28a6d671 | 2737 | #endif |
f4f154fd | 2738 | #ifdef CONFIG_FAULT_INJECTION |
631f9c18 | 2739 | REG("make-it-fail", S_IRUGO|S_IWUSR, proc_fault_inject_operations), |
f4f154fd | 2740 | #endif |
698ba7b5 | 2741 | #ifdef CONFIG_ELF_CORE |
631f9c18 | 2742 | REG("coredump_filter", S_IRUGO|S_IWUSR, proc_coredump_filter_operations), |
3cb4a0bb | 2743 | #endif |
aba76fdb | 2744 | #ifdef CONFIG_TASK_IO_ACCOUNTING |
631f9c18 | 2745 | INF("io", S_IRUGO, proc_tgid_io_accounting), |
aba76fdb | 2746 | #endif |
28a6d671 | 2747 | }; |
1da177e4 | 2748 | |
28a6d671 | 2749 | static int proc_tgid_base_readdir(struct file * filp, |
1da177e4 LT |
2750 | void * dirent, filldir_t filldir) |
2751 | { | |
2752 | return proc_pident_readdir(filp,dirent,filldir, | |
28a6d671 | 2753 | tgid_base_stuff,ARRAY_SIZE(tgid_base_stuff)); |
1da177e4 LT |
2754 | } |
2755 | ||
00977a59 | 2756 | static const struct file_operations proc_tgid_base_operations = { |
1da177e4 | 2757 | .read = generic_read_dir, |
28a6d671 | 2758 | .readdir = proc_tgid_base_readdir, |
6038f373 | 2759 | .llseek = default_llseek, |
1da177e4 LT |
2760 | }; |
2761 | ||
28a6d671 | 2762 | static struct dentry *proc_tgid_base_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd){ |
7bcd6b0e EB |
2763 | return proc_pident_lookup(dir, dentry, |
2764 | tgid_base_stuff, ARRAY_SIZE(tgid_base_stuff)); | |
1da177e4 LT |
2765 | } |
2766 | ||
c5ef1c42 | 2767 | static const struct inode_operations proc_tgid_base_inode_operations = { |
28a6d671 | 2768 | .lookup = proc_tgid_base_lookup, |
99f89551 | 2769 | .getattr = pid_getattr, |
6d76fa58 | 2770 | .setattr = proc_setattr, |
1da177e4 | 2771 | }; |
1da177e4 | 2772 | |
60347f67 | 2773 | static void proc_flush_task_mnt(struct vfsmount *mnt, pid_t pid, pid_t tgid) |
1da177e4 | 2774 | { |
48e6484d | 2775 | struct dentry *dentry, *leader, *dir; |
8578cea7 | 2776 | char buf[PROC_NUMBUF]; |
48e6484d EB |
2777 | struct qstr name; |
2778 | ||
2779 | name.name = buf; | |
60347f67 PE |
2780 | name.len = snprintf(buf, sizeof(buf), "%d", pid); |
2781 | dentry = d_hash_and_lookup(mnt->mnt_root, &name); | |
48e6484d | 2782 | if (dentry) { |
29f12ca3 | 2783 | shrink_dcache_parent(dentry); |
48e6484d EB |
2784 | d_drop(dentry); |
2785 | dput(dentry); | |
2786 | } | |
1da177e4 | 2787 | |
48e6484d | 2788 | name.name = buf; |
60347f67 PE |
2789 | name.len = snprintf(buf, sizeof(buf), "%d", tgid); |
2790 | leader = d_hash_and_lookup(mnt->mnt_root, &name); | |
48e6484d EB |
2791 | if (!leader) |
2792 | goto out; | |
1da177e4 | 2793 | |
48e6484d EB |
2794 | name.name = "task"; |
2795 | name.len = strlen(name.name); | |
2796 | dir = d_hash_and_lookup(leader, &name); | |
2797 | if (!dir) | |
2798 | goto out_put_leader; | |
2799 | ||
2800 | name.name = buf; | |
60347f67 | 2801 | name.len = snprintf(buf, sizeof(buf), "%d", pid); |
48e6484d EB |
2802 | dentry = d_hash_and_lookup(dir, &name); |
2803 | if (dentry) { | |
2804 | shrink_dcache_parent(dentry); | |
2805 | d_drop(dentry); | |
2806 | dput(dentry); | |
1da177e4 | 2807 | } |
48e6484d EB |
2808 | |
2809 | dput(dir); | |
2810 | out_put_leader: | |
2811 | dput(leader); | |
2812 | out: | |
2813 | return; | |
1da177e4 LT |
2814 | } |
2815 | ||
0895e91d RD |
2816 | /** |
2817 | * proc_flush_task - Remove dcache entries for @task from the /proc dcache. | |
2818 | * @task: task that should be flushed. | |
2819 | * | |
2820 | * When flushing dentries from proc, one needs to flush them from global | |
60347f67 | 2821 | * proc (proc_mnt) and from all the namespaces' procs this task was seen |
0895e91d RD |
2822 | * in. This call is supposed to do all of this job. |
2823 | * | |
2824 | * Looks in the dcache for | |
2825 | * /proc/@pid | |
2826 | * /proc/@tgid/task/@pid | |
2827 | * if either directory is present flushes it and all of it'ts children | |
2828 | * from the dcache. | |
2829 | * | |
2830 | * It is safe and reasonable to cache /proc entries for a task until | |
2831 | * that task exits. After that they just clog up the dcache with | |
2832 | * useless entries, possibly causing useful dcache entries to be | |
2833 | * flushed instead. This routine is proved to flush those useless | |
2834 | * dcache entries at process exit time. | |
2835 | * | |
2836 | * NOTE: This routine is just an optimization so it does not guarantee | |
2837 | * that no dcache entries will exist at process exit time it | |
2838 | * just makes it very unlikely that any will persist. | |
60347f67 PE |
2839 | */ |
2840 | ||
2841 | void proc_flush_task(struct task_struct *task) | |
2842 | { | |
9fcc2d15 | 2843 | int i; |
9b4d1cbe | 2844 | struct pid *pid, *tgid; |
130f77ec PE |
2845 | struct upid *upid; |
2846 | ||
130f77ec | 2847 | pid = task_pid(task); |
9b4d1cbe | 2848 | tgid = task_tgid(task); |
130f77ec | 2849 | |
9fcc2d15 | 2850 | for (i = 0; i <= pid->level; i++) { |
130f77ec PE |
2851 | upid = &pid->numbers[i]; |
2852 | proc_flush_task_mnt(upid->ns->proc_mnt, upid->nr, | |
9b4d1cbe | 2853 | tgid->numbers[i].nr); |
130f77ec | 2854 | } |
6f4e6433 PE |
2855 | |
2856 | upid = &pid->numbers[pid->level]; | |
2857 | if (upid->nr == 1) | |
2858 | pid_ns_release_proc(upid->ns); | |
60347f67 PE |
2859 | } |
2860 | ||
9711ef99 AB |
2861 | static struct dentry *proc_pid_instantiate(struct inode *dir, |
2862 | struct dentry * dentry, | |
c5141e6d | 2863 | struct task_struct *task, const void *ptr) |
444ceed8 EB |
2864 | { |
2865 | struct dentry *error = ERR_PTR(-ENOENT); | |
2866 | struct inode *inode; | |
2867 | ||
61a28784 | 2868 | inode = proc_pid_make_inode(dir->i_sb, task); |
444ceed8 EB |
2869 | if (!inode) |
2870 | goto out; | |
2871 | ||
2872 | inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO; | |
2873 | inode->i_op = &proc_tgid_base_inode_operations; | |
2874 | inode->i_fop = &proc_tgid_base_operations; | |
2875 | inode->i_flags|=S_IMMUTABLE; | |
aed54175 VN |
2876 | |
2877 | inode->i_nlink = 2 + pid_entry_count_dirs(tgid_base_stuff, | |
2878 | ARRAY_SIZE(tgid_base_stuff)); | |
444ceed8 EB |
2879 | |
2880 | dentry->d_op = &pid_dentry_operations; | |
2881 | ||
2882 | d_add(dentry, inode); | |
2883 | /* Close the race of the process dying before we return the dentry */ | |
2884 | if (pid_revalidate(dentry, NULL)) | |
2885 | error = NULL; | |
2886 | out: | |
2887 | return error; | |
2888 | } | |
2889 | ||
1da177e4 LT |
2890 | struct dentry *proc_pid_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd) |
2891 | { | |
73d36460 | 2892 | struct dentry *result; |
1da177e4 | 2893 | struct task_struct *task; |
1da177e4 | 2894 | unsigned tgid; |
b488893a | 2895 | struct pid_namespace *ns; |
1da177e4 | 2896 | |
801199ce EB |
2897 | result = proc_base_lookup(dir, dentry); |
2898 | if (!IS_ERR(result) || PTR_ERR(result) != -ENOENT) | |
2899 | goto out; | |
2900 | ||
1da177e4 LT |
2901 | tgid = name_to_int(dentry); |
2902 | if (tgid == ~0U) | |
2903 | goto out; | |
2904 | ||
b488893a | 2905 | ns = dentry->d_sb->s_fs_info; |
de758734 | 2906 | rcu_read_lock(); |
b488893a | 2907 | task = find_task_by_pid_ns(tgid, ns); |
1da177e4 LT |
2908 | if (task) |
2909 | get_task_struct(task); | |
de758734 | 2910 | rcu_read_unlock(); |
1da177e4 LT |
2911 | if (!task) |
2912 | goto out; | |
2913 | ||
444ceed8 | 2914 | result = proc_pid_instantiate(dir, dentry, task, NULL); |
1da177e4 | 2915 | put_task_struct(task); |
1da177e4 | 2916 | out: |
cd6a3ce9 | 2917 | return result; |
1da177e4 LT |
2918 | } |
2919 | ||
1da177e4 | 2920 | /* |
0804ef4b | 2921 | * Find the first task with tgid >= tgid |
0bc58a91 | 2922 | * |
1da177e4 | 2923 | */ |
19fd4bb2 EB |
2924 | struct tgid_iter { |
2925 | unsigned int tgid; | |
0804ef4b | 2926 | struct task_struct *task; |
19fd4bb2 EB |
2927 | }; |
2928 | static struct tgid_iter next_tgid(struct pid_namespace *ns, struct tgid_iter iter) | |
2929 | { | |
0804ef4b | 2930 | struct pid *pid; |
1da177e4 | 2931 | |
19fd4bb2 EB |
2932 | if (iter.task) |
2933 | put_task_struct(iter.task); | |
454cc105 | 2934 | rcu_read_lock(); |
0804ef4b | 2935 | retry: |
19fd4bb2 EB |
2936 | iter.task = NULL; |
2937 | pid = find_ge_pid(iter.tgid, ns); | |
0804ef4b | 2938 | if (pid) { |
19fd4bb2 EB |
2939 | iter.tgid = pid_nr_ns(pid, ns); |
2940 | iter.task = pid_task(pid, PIDTYPE_PID); | |
0804ef4b EB |
2941 | /* What we to know is if the pid we have find is the |
2942 | * pid of a thread_group_leader. Testing for task | |
2943 | * being a thread_group_leader is the obvious thing | |
2944 | * todo but there is a window when it fails, due to | |
2945 | * the pid transfer logic in de_thread. | |
2946 | * | |
2947 | * So we perform the straight forward test of seeing | |
2948 | * if the pid we have found is the pid of a thread | |
2949 | * group leader, and don't worry if the task we have | |
2950 | * found doesn't happen to be a thread group leader. | |
2951 | * As we don't care in the case of readdir. | |
2952 | */ | |
19fd4bb2 EB |
2953 | if (!iter.task || !has_group_leader_pid(iter.task)) { |
2954 | iter.tgid += 1; | |
0804ef4b | 2955 | goto retry; |
19fd4bb2 EB |
2956 | } |
2957 | get_task_struct(iter.task); | |
0bc58a91 | 2958 | } |
454cc105 | 2959 | rcu_read_unlock(); |
19fd4bb2 | 2960 | return iter; |
1da177e4 LT |
2961 | } |
2962 | ||
7bcd6b0e | 2963 | #define TGID_OFFSET (FIRST_PROCESS_ENTRY + ARRAY_SIZE(proc_base_stuff)) |
0804ef4b | 2964 | |
61a28784 | 2965 | static int proc_pid_fill_cache(struct file *filp, void *dirent, filldir_t filldir, |
19fd4bb2 | 2966 | struct tgid_iter iter) |
61a28784 EB |
2967 | { |
2968 | char name[PROC_NUMBUF]; | |
19fd4bb2 | 2969 | int len = snprintf(name, sizeof(name), "%d", iter.tgid); |
61a28784 | 2970 | return proc_fill_cache(filp, dirent, filldir, name, len, |
19fd4bb2 | 2971 | proc_pid_instantiate, iter.task, NULL); |
61a28784 EB |
2972 | } |
2973 | ||
1da177e4 LT |
2974 | /* for the /proc/ directory itself, after non-process stuff has been done */ |
2975 | int proc_pid_readdir(struct file * filp, void * dirent, filldir_t filldir) | |
2976 | { | |
1da177e4 | 2977 | unsigned int nr = filp->f_pos - FIRST_PROCESS_ENTRY; |
2fddfeef | 2978 | struct task_struct *reaper = get_proc_task(filp->f_path.dentry->d_inode); |
19fd4bb2 | 2979 | struct tgid_iter iter; |
b488893a | 2980 | struct pid_namespace *ns; |
1da177e4 | 2981 | |
61a28784 EB |
2982 | if (!reaper) |
2983 | goto out_no_task; | |
2984 | ||
7bcd6b0e | 2985 | for (; nr < ARRAY_SIZE(proc_base_stuff); filp->f_pos++, nr++) { |
c5141e6d | 2986 | const struct pid_entry *p = &proc_base_stuff[nr]; |
61a28784 | 2987 | if (proc_base_fill_cache(filp, dirent, filldir, reaper, p) < 0) |
801199ce | 2988 | goto out; |
1da177e4 LT |
2989 | } |
2990 | ||
b488893a | 2991 | ns = filp->f_dentry->d_sb->s_fs_info; |
19fd4bb2 EB |
2992 | iter.task = NULL; |
2993 | iter.tgid = filp->f_pos - TGID_OFFSET; | |
2994 | for (iter = next_tgid(ns, iter); | |
2995 | iter.task; | |
2996 | iter.tgid += 1, iter = next_tgid(ns, iter)) { | |
2997 | filp->f_pos = iter.tgid + TGID_OFFSET; | |
2998 | if (proc_pid_fill_cache(filp, dirent, filldir, iter) < 0) { | |
2999 | put_task_struct(iter.task); | |
0804ef4b | 3000 | goto out; |
1da177e4 | 3001 | } |
0bc58a91 | 3002 | } |
0804ef4b EB |
3003 | filp->f_pos = PID_MAX_LIMIT + TGID_OFFSET; |
3004 | out: | |
61a28784 EB |
3005 | put_task_struct(reaper); |
3006 | out_no_task: | |
0bc58a91 EB |
3007 | return 0; |
3008 | } | |
1da177e4 | 3009 | |
28a6d671 EB |
3010 | /* |
3011 | * Tasks | |
3012 | */ | |
c5141e6d | 3013 | static const struct pid_entry tid_base_stuff[] = { |
631f9c18 | 3014 | DIR("fd", S_IRUSR|S_IXUSR, proc_fd_inode_operations, proc_fd_operations), |
3835541d | 3015 | DIR("fdinfo", S_IRUSR|S_IXUSR, proc_fdinfo_inode_operations, proc_fdinfo_operations), |
631f9c18 AD |
3016 | REG("environ", S_IRUSR, proc_environ_operations), |
3017 | INF("auxv", S_IRUSR, proc_pid_auxv), | |
3018 | ONE("status", S_IRUGO, proc_pid_status), | |
3019 | ONE("personality", S_IRUSR, proc_pid_personality), | |
3036e7b4 | 3020 | INF("limits", S_IRUGO, proc_pid_limits), |
43ae34cb | 3021 | #ifdef CONFIG_SCHED_DEBUG |
631f9c18 | 3022 | REG("sched", S_IRUGO|S_IWUSR, proc_pid_sched_operations), |
ebcb6734 | 3023 | #endif |
4614a696 | 3024 | REG("comm", S_IRUGO|S_IWUSR, proc_pid_set_comm_operations), |
ebcb6734 | 3025 | #ifdef CONFIG_HAVE_ARCH_TRACEHOOK |
631f9c18 | 3026 | INF("syscall", S_IRUSR, proc_pid_syscall), |
43ae34cb | 3027 | #endif |
631f9c18 AD |
3028 | INF("cmdline", S_IRUGO, proc_pid_cmdline), |
3029 | ONE("stat", S_IRUGO, proc_tid_stat), | |
3030 | ONE("statm", S_IRUGO, proc_pid_statm), | |
3031 | REG("maps", S_IRUGO, proc_maps_operations), | |
28a6d671 | 3032 | #ifdef CONFIG_NUMA |
631f9c18 | 3033 | REG("numa_maps", S_IRUGO, proc_numa_maps_operations), |
28a6d671 | 3034 | #endif |
631f9c18 AD |
3035 | REG("mem", S_IRUSR|S_IWUSR, proc_mem_operations), |
3036 | LNK("cwd", proc_cwd_link), | |
3037 | LNK("root", proc_root_link), | |
3038 | LNK("exe", proc_exe_link), | |
3039 | REG("mounts", S_IRUGO, proc_mounts_operations), | |
3040 | REG("mountinfo", S_IRUGO, proc_mountinfo_operations), | |
1e883281 | 3041 | #ifdef CONFIG_PROC_PAGE_MONITOR |
631f9c18 AD |
3042 | REG("clear_refs", S_IWUSR, proc_clear_refs_operations), |
3043 | REG("smaps", S_IRUGO, proc_smaps_operations), | |
3044 | REG("pagemap", S_IRUSR, proc_pagemap_operations), | |
28a6d671 EB |
3045 | #endif |
3046 | #ifdef CONFIG_SECURITY | |
631f9c18 | 3047 | DIR("attr", S_IRUGO|S_IXUGO, proc_attr_dir_inode_operations, proc_attr_dir_operations), |
28a6d671 EB |
3048 | #endif |
3049 | #ifdef CONFIG_KALLSYMS | |
631f9c18 | 3050 | INF("wchan", S_IRUGO, proc_pid_wchan), |
28a6d671 | 3051 | #endif |
2ec220e2 KC |
3052 | #ifdef CONFIG_STACKTRACE |
3053 | ONE("stack", S_IRUSR, proc_pid_stack), | |
28a6d671 EB |
3054 | #endif |
3055 | #ifdef CONFIG_SCHEDSTATS | |
631f9c18 | 3056 | INF("schedstat", S_IRUGO, proc_pid_schedstat), |
28a6d671 | 3057 | #endif |
9745512c | 3058 | #ifdef CONFIG_LATENCYTOP |
631f9c18 | 3059 | REG("latency", S_IRUGO, proc_lstats_operations), |
9745512c | 3060 | #endif |
8793d854 | 3061 | #ifdef CONFIG_PROC_PID_CPUSET |
631f9c18 | 3062 | REG("cpuset", S_IRUGO, proc_cpuset_operations), |
a424316c PM |
3063 | #endif |
3064 | #ifdef CONFIG_CGROUPS | |
631f9c18 | 3065 | REG("cgroup", S_IRUGO, proc_cgroup_operations), |
28a6d671 | 3066 | #endif |
631f9c18 AD |
3067 | INF("oom_score", S_IRUGO, proc_oom_score), |
3068 | REG("oom_adj", S_IRUGO|S_IWUSR, proc_oom_adjust_operations), | |
a63d83f4 | 3069 | REG("oom_score_adj", S_IRUGO|S_IWUSR, proc_oom_score_adj_operations), |
28a6d671 | 3070 | #ifdef CONFIG_AUDITSYSCALL |
631f9c18 AD |
3071 | REG("loginuid", S_IWUSR|S_IRUGO, proc_loginuid_operations), |
3072 | REG("sessionid", S_IRUSR, proc_sessionid_operations), | |
28a6d671 | 3073 | #endif |
f4f154fd | 3074 | #ifdef CONFIG_FAULT_INJECTION |
631f9c18 | 3075 | REG("make-it-fail", S_IRUGO|S_IWUSR, proc_fault_inject_operations), |
f4f154fd | 3076 | #endif |
297c5d92 | 3077 | #ifdef CONFIG_TASK_IO_ACCOUNTING |
631f9c18 | 3078 | INF("io", S_IRUGO, proc_tid_io_accounting), |
297c5d92 | 3079 | #endif |
28a6d671 EB |
3080 | }; |
3081 | ||
3082 | static int proc_tid_base_readdir(struct file * filp, | |
3083 | void * dirent, filldir_t filldir) | |
3084 | { | |
3085 | return proc_pident_readdir(filp,dirent,filldir, | |
3086 | tid_base_stuff,ARRAY_SIZE(tid_base_stuff)); | |
3087 | } | |
3088 | ||
3089 | static struct dentry *proc_tid_base_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd){ | |
7bcd6b0e EB |
3090 | return proc_pident_lookup(dir, dentry, |
3091 | tid_base_stuff, ARRAY_SIZE(tid_base_stuff)); | |
28a6d671 EB |
3092 | } |
3093 | ||
00977a59 | 3094 | static const struct file_operations proc_tid_base_operations = { |
28a6d671 EB |
3095 | .read = generic_read_dir, |
3096 | .readdir = proc_tid_base_readdir, | |
6038f373 | 3097 | .llseek = default_llseek, |
28a6d671 EB |
3098 | }; |
3099 | ||
c5ef1c42 | 3100 | static const struct inode_operations proc_tid_base_inode_operations = { |
28a6d671 EB |
3101 | .lookup = proc_tid_base_lookup, |
3102 | .getattr = pid_getattr, | |
3103 | .setattr = proc_setattr, | |
3104 | }; | |
3105 | ||
444ceed8 | 3106 | static struct dentry *proc_task_instantiate(struct inode *dir, |
c5141e6d | 3107 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
444ceed8 EB |
3108 | { |
3109 | struct dentry *error = ERR_PTR(-ENOENT); | |
3110 | struct inode *inode; | |
61a28784 | 3111 | inode = proc_pid_make_inode(dir->i_sb, task); |
444ceed8 EB |
3112 | |
3113 | if (!inode) | |
3114 | goto out; | |
3115 | inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO; | |
3116 | inode->i_op = &proc_tid_base_inode_operations; | |
3117 | inode->i_fop = &proc_tid_base_operations; | |
3118 | inode->i_flags|=S_IMMUTABLE; | |
aed54175 VN |
3119 | |
3120 | inode->i_nlink = 2 + pid_entry_count_dirs(tid_base_stuff, | |
3121 | ARRAY_SIZE(tid_base_stuff)); | |
444ceed8 EB |
3122 | |
3123 | dentry->d_op = &pid_dentry_operations; | |
3124 | ||
3125 | d_add(dentry, inode); | |
3126 | /* Close the race of the process dying before we return the dentry */ | |
3127 | if (pid_revalidate(dentry, NULL)) | |
3128 | error = NULL; | |
3129 | out: | |
3130 | return error; | |
3131 | } | |
3132 | ||
28a6d671 EB |
3133 | static struct dentry *proc_task_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd) |
3134 | { | |
3135 | struct dentry *result = ERR_PTR(-ENOENT); | |
3136 | struct task_struct *task; | |
3137 | struct task_struct *leader = get_proc_task(dir); | |
28a6d671 | 3138 | unsigned tid; |
b488893a | 3139 | struct pid_namespace *ns; |
28a6d671 EB |
3140 | |
3141 | if (!leader) | |
3142 | goto out_no_task; | |
3143 | ||
3144 | tid = name_to_int(dentry); | |
3145 | if (tid == ~0U) | |
3146 | goto out; | |
3147 | ||
b488893a | 3148 | ns = dentry->d_sb->s_fs_info; |
28a6d671 | 3149 | rcu_read_lock(); |
b488893a | 3150 | task = find_task_by_pid_ns(tid, ns); |
28a6d671 EB |
3151 | if (task) |
3152 | get_task_struct(task); | |
3153 | rcu_read_unlock(); | |
3154 | if (!task) | |
3155 | goto out; | |
bac0abd6 | 3156 | if (!same_thread_group(leader, task)) |
28a6d671 EB |
3157 | goto out_drop_task; |
3158 | ||
444ceed8 | 3159 | result = proc_task_instantiate(dir, dentry, task, NULL); |
28a6d671 EB |
3160 | out_drop_task: |
3161 | put_task_struct(task); | |
3162 | out: | |
3163 | put_task_struct(leader); | |
3164 | out_no_task: | |
3165 | return result; | |
3166 | } | |
3167 | ||
0bc58a91 EB |
3168 | /* |
3169 | * Find the first tid of a thread group to return to user space. | |
3170 | * | |
3171 | * Usually this is just the thread group leader, but if the users | |
3172 | * buffer was too small or there was a seek into the middle of the | |
3173 | * directory we have more work todo. | |
3174 | * | |
3175 | * In the case of a short read we start with find_task_by_pid. | |
3176 | * | |
3177 | * In the case of a seek we start with the leader and walk nr | |
3178 | * threads past it. | |
3179 | */ | |
cc288738 | 3180 | static struct task_struct *first_tid(struct task_struct *leader, |
b488893a | 3181 | int tid, int nr, struct pid_namespace *ns) |
0bc58a91 | 3182 | { |
a872ff0c | 3183 | struct task_struct *pos; |
1da177e4 | 3184 | |
cc288738 | 3185 | rcu_read_lock(); |
0bc58a91 EB |
3186 | /* Attempt to start with the pid of a thread */ |
3187 | if (tid && (nr > 0)) { | |
b488893a | 3188 | pos = find_task_by_pid_ns(tid, ns); |
a872ff0c ON |
3189 | if (pos && (pos->group_leader == leader)) |
3190 | goto found; | |
0bc58a91 | 3191 | } |
1da177e4 | 3192 | |
0bc58a91 | 3193 | /* If nr exceeds the number of threads there is nothing todo */ |
a872ff0c ON |
3194 | pos = NULL; |
3195 | if (nr && nr >= get_nr_threads(leader)) | |
3196 | goto out; | |
1da177e4 | 3197 | |
a872ff0c ON |
3198 | /* If we haven't found our starting place yet start |
3199 | * with the leader and walk nr threads forward. | |
0bc58a91 | 3200 | */ |
a872ff0c ON |
3201 | for (pos = leader; nr > 0; --nr) { |
3202 | pos = next_thread(pos); | |
3203 | if (pos == leader) { | |
3204 | pos = NULL; | |
3205 | goto out; | |
3206 | } | |
1da177e4 | 3207 | } |
a872ff0c ON |
3208 | found: |
3209 | get_task_struct(pos); | |
3210 | out: | |
cc288738 | 3211 | rcu_read_unlock(); |
0bc58a91 EB |
3212 | return pos; |
3213 | } | |
3214 | ||
3215 | /* | |
3216 | * Find the next thread in the thread list. | |
3217 | * Return NULL if there is an error or no next thread. | |
3218 | * | |
3219 | * The reference to the input task_struct is released. | |
3220 | */ | |
3221 | static struct task_struct *next_tid(struct task_struct *start) | |
3222 | { | |
c1df7fb8 | 3223 | struct task_struct *pos = NULL; |
cc288738 | 3224 | rcu_read_lock(); |
c1df7fb8 | 3225 | if (pid_alive(start)) { |
0bc58a91 | 3226 | pos = next_thread(start); |
c1df7fb8 ON |
3227 | if (thread_group_leader(pos)) |
3228 | pos = NULL; | |
3229 | else | |
3230 | get_task_struct(pos); | |
3231 | } | |
cc288738 | 3232 | rcu_read_unlock(); |
0bc58a91 EB |
3233 | put_task_struct(start); |
3234 | return pos; | |
1da177e4 LT |
3235 | } |
3236 | ||
61a28784 EB |
3237 | static int proc_task_fill_cache(struct file *filp, void *dirent, filldir_t filldir, |
3238 | struct task_struct *task, int tid) | |
3239 | { | |
3240 | char name[PROC_NUMBUF]; | |
3241 | int len = snprintf(name, sizeof(name), "%d", tid); | |
3242 | return proc_fill_cache(filp, dirent, filldir, name, len, | |
3243 | proc_task_instantiate, task, NULL); | |
3244 | } | |
3245 | ||
1da177e4 LT |
3246 | /* for the /proc/TGID/task/ directories */ |
3247 | static int proc_task_readdir(struct file * filp, void * dirent, filldir_t filldir) | |
3248 | { | |
2fddfeef | 3249 | struct dentry *dentry = filp->f_path.dentry; |
1da177e4 | 3250 | struct inode *inode = dentry->d_inode; |
7d895244 | 3251 | struct task_struct *leader = NULL; |
0bc58a91 | 3252 | struct task_struct *task; |
1da177e4 LT |
3253 | int retval = -ENOENT; |
3254 | ino_t ino; | |
0bc58a91 | 3255 | int tid; |
b488893a | 3256 | struct pid_namespace *ns; |
1da177e4 | 3257 | |
7d895244 GC |
3258 | task = get_proc_task(inode); |
3259 | if (!task) | |
3260 | goto out_no_task; | |
3261 | rcu_read_lock(); | |
3262 | if (pid_alive(task)) { | |
3263 | leader = task->group_leader; | |
3264 | get_task_struct(leader); | |
3265 | } | |
3266 | rcu_read_unlock(); | |
3267 | put_task_struct(task); | |
99f89551 EB |
3268 | if (!leader) |
3269 | goto out_no_task; | |
1da177e4 LT |
3270 | retval = 0; |
3271 | ||
ee568b25 | 3272 | switch ((unsigned long)filp->f_pos) { |
1da177e4 LT |
3273 | case 0: |
3274 | ino = inode->i_ino; | |
ee6f779b | 3275 | if (filldir(dirent, ".", 1, filp->f_pos, ino, DT_DIR) < 0) |
1da177e4 | 3276 | goto out; |
ee6f779b | 3277 | filp->f_pos++; |
1da177e4 LT |
3278 | /* fall through */ |
3279 | case 1: | |
3280 | ino = parent_ino(dentry); | |
ee6f779b | 3281 | if (filldir(dirent, "..", 2, filp->f_pos, ino, DT_DIR) < 0) |
1da177e4 | 3282 | goto out; |
ee6f779b | 3283 | filp->f_pos++; |
1da177e4 LT |
3284 | /* fall through */ |
3285 | } | |
3286 | ||
0bc58a91 EB |
3287 | /* f_version caches the tgid value that the last readdir call couldn't |
3288 | * return. lseek aka telldir automagically resets f_version to 0. | |
3289 | */ | |
b488893a | 3290 | ns = filp->f_dentry->d_sb->s_fs_info; |
2b47c361 | 3291 | tid = (int)filp->f_version; |
0bc58a91 | 3292 | filp->f_version = 0; |
ee6f779b | 3293 | for (task = first_tid(leader, tid, filp->f_pos - 2, ns); |
0bc58a91 | 3294 | task; |
ee6f779b | 3295 | task = next_tid(task), filp->f_pos++) { |
b488893a | 3296 | tid = task_pid_nr_ns(task, ns); |
61a28784 | 3297 | if (proc_task_fill_cache(filp, dirent, filldir, task, tid) < 0) { |
0bc58a91 EB |
3298 | /* returning this tgid failed, save it as the first |
3299 | * pid for the next readir call */ | |
2b47c361 | 3300 | filp->f_version = (u64)tid; |
0bc58a91 | 3301 | put_task_struct(task); |
1da177e4 | 3302 | break; |
0bc58a91 | 3303 | } |
1da177e4 LT |
3304 | } |
3305 | out: | |
99f89551 EB |
3306 | put_task_struct(leader); |
3307 | out_no_task: | |
1da177e4 LT |
3308 | return retval; |
3309 | } | |
6e66b52b EB |
3310 | |
3311 | static int proc_task_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) | |
3312 | { | |
3313 | struct inode *inode = dentry->d_inode; | |
99f89551 | 3314 | struct task_struct *p = get_proc_task(inode); |
6e66b52b EB |
3315 | generic_fillattr(inode, stat); |
3316 | ||
99f89551 | 3317 | if (p) { |
99f89551 | 3318 | stat->nlink += get_nr_threads(p); |
99f89551 | 3319 | put_task_struct(p); |
6e66b52b EB |
3320 | } |
3321 | ||
3322 | return 0; | |
3323 | } | |
28a6d671 | 3324 | |
c5ef1c42 | 3325 | static const struct inode_operations proc_task_inode_operations = { |
28a6d671 EB |
3326 | .lookup = proc_task_lookup, |
3327 | .getattr = proc_task_getattr, | |
3328 | .setattr = proc_setattr, | |
3329 | }; | |
3330 | ||
00977a59 | 3331 | static const struct file_operations proc_task_operations = { |
28a6d671 EB |
3332 | .read = generic_read_dir, |
3333 | .readdir = proc_task_readdir, | |
6038f373 | 3334 | .llseek = default_llseek, |
28a6d671 | 3335 | }; |