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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/fs/proc/base.c | |
3 | * | |
4 | * Copyright (C) 1991, 1992 Linus Torvalds | |
5 | * | |
6 | * proc base directory handling functions | |
7 | * | |
8 | * 1999, Al Viro. Rewritten. Now it covers the whole per-process part. | |
9 | * Instead of using magical inumbers to determine the kind of object | |
10 | * we allocate and fill in-core inodes upon lookup. They don't even | |
11 | * go into icache. We cache the reference to task_struct upon lookup too. | |
12 | * Eventually it should become a filesystem in its own. We don't use the | |
13 | * rest of procfs anymore. | |
e070ad49 ML |
14 | * |
15 | * | |
16 | * Changelog: | |
17 | * 17-Jan-2005 | |
18 | * Allan Bezerra | |
19 | * Bruna Moreira <bruna.moreira@indt.org.br> | |
20 | * Edjard Mota <edjard.mota@indt.org.br> | |
21 | * Ilias Biris <ilias.biris@indt.org.br> | |
22 | * Mauricio Lin <mauricio.lin@indt.org.br> | |
23 | * | |
24 | * Embedded Linux Lab - 10LE Instituto Nokia de Tecnologia - INdT | |
25 | * | |
26 | * A new process specific entry (smaps) included in /proc. It shows the | |
27 | * size of rss for each memory area. The maps entry lacks information | |
28 | * about physical memory size (rss) for each mapped file, i.e., | |
29 | * rss information for executables and library files. | |
30 | * This additional information is useful for any tools that need to know | |
31 | * about physical memory consumption for a process specific library. | |
32 | * | |
33 | * Changelog: | |
34 | * 21-Feb-2005 | |
35 | * Embedded Linux Lab - 10LE Instituto Nokia de Tecnologia - INdT | |
36 | * Pud inclusion in the page table walking. | |
37 | * | |
38 | * ChangeLog: | |
39 | * 10-Mar-2005 | |
40 | * 10LE Instituto Nokia de Tecnologia - INdT: | |
41 | * A better way to walks through the page table as suggested by Hugh Dickins. | |
42 | * | |
43 | * Simo Piiroinen <simo.piiroinen@nokia.com>: | |
44 | * Smaps information related to shared, private, clean and dirty pages. | |
45 | * | |
46 | * Paul Mundt <paul.mundt@nokia.com>: | |
47 | * Overall revision about smaps. | |
1da177e4 LT |
48 | */ |
49 | ||
50 | #include <asm/uaccess.h> | |
51 | ||
1da177e4 LT |
52 | #include <linux/errno.h> |
53 | #include <linux/time.h> | |
54 | #include <linux/proc_fs.h> | |
55 | #include <linux/stat.h> | |
56 | #include <linux/init.h> | |
16f7e0fe | 57 | #include <linux/capability.h> |
1da177e4 | 58 | #include <linux/file.h> |
9f3acc31 | 59 | #include <linux/fdtable.h> |
1da177e4 LT |
60 | #include <linux/string.h> |
61 | #include <linux/seq_file.h> | |
62 | #include <linux/namei.h> | |
6b3286ed | 63 | #include <linux/mnt_namespace.h> |
1da177e4 | 64 | #include <linux/mm.h> |
b835996f | 65 | #include <linux/rcupdate.h> |
1da177e4 | 66 | #include <linux/kallsyms.h> |
d85f50d5 | 67 | #include <linux/resource.h> |
5096add8 | 68 | #include <linux/module.h> |
1da177e4 LT |
69 | #include <linux/mount.h> |
70 | #include <linux/security.h> | |
71 | #include <linux/ptrace.h> | |
a424316c | 72 | #include <linux/cgroup.h> |
1da177e4 LT |
73 | #include <linux/cpuset.h> |
74 | #include <linux/audit.h> | |
5addc5dd | 75 | #include <linux/poll.h> |
1651e14e | 76 | #include <linux/nsproxy.h> |
8ac773b4 | 77 | #include <linux/oom.h> |
3cb4a0bb | 78 | #include <linux/elf.h> |
60347f67 | 79 | #include <linux/pid_namespace.h> |
1da177e4 LT |
80 | #include "internal.h" |
81 | ||
0f2fe20f EB |
82 | /* NOTE: |
83 | * Implementing inode permission operations in /proc is almost | |
84 | * certainly an error. Permission checks need to happen during | |
85 | * each system call not at open time. The reason is that most of | |
86 | * what we wish to check for permissions in /proc varies at runtime. | |
87 | * | |
88 | * The classic example of a problem is opening file descriptors | |
89 | * in /proc for a task before it execs a suid executable. | |
90 | */ | |
91 | ||
1da177e4 | 92 | struct pid_entry { |
1da177e4 | 93 | char *name; |
c5141e6d | 94 | int len; |
1da177e4 | 95 | mode_t mode; |
c5ef1c42 | 96 | const struct inode_operations *iop; |
00977a59 | 97 | const struct file_operations *fop; |
20cdc894 | 98 | union proc_op op; |
1da177e4 LT |
99 | }; |
100 | ||
61a28784 | 101 | #define NOD(NAME, MODE, IOP, FOP, OP) { \ |
20cdc894 | 102 | .name = (NAME), \ |
c5141e6d | 103 | .len = sizeof(NAME) - 1, \ |
20cdc894 EB |
104 | .mode = MODE, \ |
105 | .iop = IOP, \ | |
106 | .fop = FOP, \ | |
107 | .op = OP, \ | |
108 | } | |
109 | ||
61a28784 EB |
110 | #define DIR(NAME, MODE, OTYPE) \ |
111 | NOD(NAME, (S_IFDIR|(MODE)), \ | |
20cdc894 EB |
112 | &proc_##OTYPE##_inode_operations, &proc_##OTYPE##_operations, \ |
113 | {} ) | |
61a28784 EB |
114 | #define LNK(NAME, OTYPE) \ |
115 | NOD(NAME, (S_IFLNK|S_IRWXUGO), \ | |
20cdc894 EB |
116 | &proc_pid_link_inode_operations, NULL, \ |
117 | { .proc_get_link = &proc_##OTYPE##_link } ) | |
61a28784 EB |
118 | #define REG(NAME, MODE, OTYPE) \ |
119 | NOD(NAME, (S_IFREG|(MODE)), NULL, \ | |
20cdc894 | 120 | &proc_##OTYPE##_operations, {}) |
61a28784 EB |
121 | #define INF(NAME, MODE, OTYPE) \ |
122 | NOD(NAME, (S_IFREG|(MODE)), \ | |
20cdc894 EB |
123 | NULL, &proc_info_file_operations, \ |
124 | { .proc_read = &proc_##OTYPE } ) | |
be614086 EB |
125 | #define ONE(NAME, MODE, OTYPE) \ |
126 | NOD(NAME, (S_IFREG|(MODE)), \ | |
127 | NULL, &proc_single_file_operations, \ | |
128 | { .proc_show = &proc_##OTYPE } ) | |
1da177e4 | 129 | |
5096add8 KC |
130 | int maps_protect; |
131 | EXPORT_SYMBOL(maps_protect); | |
132 | ||
0494f6ec | 133 | static struct fs_struct *get_fs_struct(struct task_struct *task) |
1da177e4 LT |
134 | { |
135 | struct fs_struct *fs; | |
0494f6ec MS |
136 | task_lock(task); |
137 | fs = task->fs; | |
1da177e4 LT |
138 | if(fs) |
139 | atomic_inc(&fs->count); | |
0494f6ec MS |
140 | task_unlock(task); |
141 | return fs; | |
142 | } | |
143 | ||
99f89551 EB |
144 | static int get_nr_threads(struct task_struct *tsk) |
145 | { | |
146 | /* Must be called with the rcu_read_lock held */ | |
147 | unsigned long flags; | |
148 | int count = 0; | |
149 | ||
150 | if (lock_task_sighand(tsk, &flags)) { | |
151 | count = atomic_read(&tsk->signal->count); | |
152 | unlock_task_sighand(tsk, &flags); | |
153 | } | |
154 | return count; | |
155 | } | |
156 | ||
3dcd25f3 | 157 | static int proc_cwd_link(struct inode *inode, struct path *path) |
0494f6ec | 158 | { |
99f89551 EB |
159 | struct task_struct *task = get_proc_task(inode); |
160 | struct fs_struct *fs = NULL; | |
0494f6ec | 161 | int result = -ENOENT; |
99f89551 EB |
162 | |
163 | if (task) { | |
164 | fs = get_fs_struct(task); | |
165 | put_task_struct(task); | |
166 | } | |
1da177e4 LT |
167 | if (fs) { |
168 | read_lock(&fs->lock); | |
3dcd25f3 JB |
169 | *path = fs->pwd; |
170 | path_get(&fs->pwd); | |
1da177e4 LT |
171 | read_unlock(&fs->lock); |
172 | result = 0; | |
173 | put_fs_struct(fs); | |
174 | } | |
175 | return result; | |
176 | } | |
177 | ||
3dcd25f3 | 178 | static int proc_root_link(struct inode *inode, struct path *path) |
1da177e4 | 179 | { |
99f89551 EB |
180 | struct task_struct *task = get_proc_task(inode); |
181 | struct fs_struct *fs = NULL; | |
1da177e4 | 182 | int result = -ENOENT; |
99f89551 EB |
183 | |
184 | if (task) { | |
185 | fs = get_fs_struct(task); | |
186 | put_task_struct(task); | |
187 | } | |
1da177e4 LT |
188 | if (fs) { |
189 | read_lock(&fs->lock); | |
3dcd25f3 JB |
190 | *path = fs->root; |
191 | path_get(&fs->root); | |
1da177e4 LT |
192 | read_unlock(&fs->lock); |
193 | result = 0; | |
194 | put_fs_struct(fs); | |
195 | } | |
196 | return result; | |
197 | } | |
198 | ||
638fa202 RM |
199 | /* |
200 | * Return zero if current may access user memory in @task, -error if not. | |
201 | */ | |
202 | static int check_mem_permission(struct task_struct *task) | |
203 | { | |
204 | /* | |
205 | * A task can always look at itself, in case it chooses | |
206 | * to use system calls instead of load instructions. | |
207 | */ | |
208 | if (task == current) | |
209 | return 0; | |
210 | ||
211 | /* | |
212 | * If current is actively ptrace'ing, and would also be | |
213 | * permitted to freshly attach with ptrace now, permit it. | |
214 | */ | |
215 | if (task->parent == current && (task->ptrace & PT_PTRACED) && | |
216 | task_is_stopped_or_traced(task) && | |
217 | ptrace_may_attach(task)) | |
218 | return 0; | |
219 | ||
220 | /* | |
221 | * Noone else is allowed. | |
222 | */ | |
223 | return -EPERM; | |
224 | } | |
1da177e4 | 225 | |
831830b5 AV |
226 | struct mm_struct *mm_for_maps(struct task_struct *task) |
227 | { | |
228 | struct mm_struct *mm = get_task_mm(task); | |
229 | if (!mm) | |
230 | return NULL; | |
231 | down_read(&mm->mmap_sem); | |
232 | task_lock(task); | |
233 | if (task->mm != mm) | |
234 | goto out; | |
235 | if (task->mm != current->mm && __ptrace_may_attach(task) < 0) | |
236 | goto out; | |
237 | task_unlock(task); | |
238 | return mm; | |
239 | out: | |
240 | task_unlock(task); | |
241 | up_read(&mm->mmap_sem); | |
242 | mmput(mm); | |
243 | return NULL; | |
244 | } | |
245 | ||
1da177e4 LT |
246 | static int proc_pid_cmdline(struct task_struct *task, char * buffer) |
247 | { | |
248 | int res = 0; | |
249 | unsigned int len; | |
250 | struct mm_struct *mm = get_task_mm(task); | |
251 | if (!mm) | |
252 | goto out; | |
253 | if (!mm->arg_end) | |
254 | goto out_mm; /* Shh! No looking before we're done */ | |
255 | ||
256 | len = mm->arg_end - mm->arg_start; | |
257 | ||
258 | if (len > PAGE_SIZE) | |
259 | len = PAGE_SIZE; | |
260 | ||
261 | res = access_process_vm(task, mm->arg_start, buffer, len, 0); | |
262 | ||
263 | // If the nul at the end of args has been overwritten, then | |
264 | // assume application is using setproctitle(3). | |
265 | if (res > 0 && buffer[res-1] != '\0' && len < PAGE_SIZE) { | |
266 | len = strnlen(buffer, res); | |
267 | if (len < res) { | |
268 | res = len; | |
269 | } else { | |
270 | len = mm->env_end - mm->env_start; | |
271 | if (len > PAGE_SIZE - res) | |
272 | len = PAGE_SIZE - res; | |
273 | res += access_process_vm(task, mm->env_start, buffer+res, len, 0); | |
274 | res = strnlen(buffer, res); | |
275 | } | |
276 | } | |
277 | out_mm: | |
278 | mmput(mm); | |
279 | out: | |
280 | return res; | |
281 | } | |
282 | ||
283 | static int proc_pid_auxv(struct task_struct *task, char *buffer) | |
284 | { | |
285 | int res = 0; | |
286 | struct mm_struct *mm = get_task_mm(task); | |
287 | if (mm) { | |
288 | unsigned int nwords = 0; | |
289 | do | |
290 | nwords += 2; | |
291 | while (mm->saved_auxv[nwords - 2] != 0); /* AT_NULL */ | |
292 | res = nwords * sizeof(mm->saved_auxv[0]); | |
293 | if (res > PAGE_SIZE) | |
294 | res = PAGE_SIZE; | |
295 | memcpy(buffer, mm->saved_auxv, res); | |
296 | mmput(mm); | |
297 | } | |
298 | return res; | |
299 | } | |
300 | ||
301 | ||
302 | #ifdef CONFIG_KALLSYMS | |
303 | /* | |
304 | * Provides a wchan file via kallsyms in a proper one-value-per-file format. | |
305 | * Returns the resolved symbol. If that fails, simply return the address. | |
306 | */ | |
307 | static int proc_pid_wchan(struct task_struct *task, char *buffer) | |
308 | { | |
ffb45122 | 309 | unsigned long wchan; |
9281acea | 310 | char symname[KSYM_NAME_LEN]; |
1da177e4 LT |
311 | |
312 | wchan = get_wchan(task); | |
313 | ||
9d65cb4a AD |
314 | if (lookup_symbol_name(wchan, symname) < 0) |
315 | return sprintf(buffer, "%lu", wchan); | |
316 | else | |
317 | return sprintf(buffer, "%s", symname); | |
1da177e4 LT |
318 | } |
319 | #endif /* CONFIG_KALLSYMS */ | |
320 | ||
321 | #ifdef CONFIG_SCHEDSTATS | |
322 | /* | |
323 | * Provides /proc/PID/schedstat | |
324 | */ | |
325 | static int proc_pid_schedstat(struct task_struct *task, char *buffer) | |
326 | { | |
172ba844 | 327 | return sprintf(buffer, "%llu %llu %lu\n", |
1da177e4 LT |
328 | task->sched_info.cpu_time, |
329 | task->sched_info.run_delay, | |
2d72376b | 330 | task->sched_info.pcount); |
1da177e4 LT |
331 | } |
332 | #endif | |
333 | ||
9745512c AV |
334 | #ifdef CONFIG_LATENCYTOP |
335 | static int lstats_show_proc(struct seq_file *m, void *v) | |
336 | { | |
337 | int i; | |
13d77c37 HS |
338 | struct inode *inode = m->private; |
339 | struct task_struct *task = get_proc_task(inode); | |
9745512c | 340 | |
13d77c37 HS |
341 | if (!task) |
342 | return -ESRCH; | |
343 | seq_puts(m, "Latency Top version : v0.1\n"); | |
9745512c AV |
344 | for (i = 0; i < 32; i++) { |
345 | if (task->latency_record[i].backtrace[0]) { | |
346 | int q; | |
347 | seq_printf(m, "%i %li %li ", | |
348 | task->latency_record[i].count, | |
349 | task->latency_record[i].time, | |
350 | task->latency_record[i].max); | |
351 | for (q = 0; q < LT_BACKTRACEDEPTH; q++) { | |
352 | char sym[KSYM_NAME_LEN]; | |
353 | char *c; | |
354 | if (!task->latency_record[i].backtrace[q]) | |
355 | break; | |
356 | if (task->latency_record[i].backtrace[q] == ULONG_MAX) | |
357 | break; | |
358 | sprint_symbol(sym, task->latency_record[i].backtrace[q]); | |
359 | c = strchr(sym, '+'); | |
360 | if (c) | |
361 | *c = 0; | |
362 | seq_printf(m, "%s ", sym); | |
363 | } | |
364 | seq_printf(m, "\n"); | |
365 | } | |
366 | ||
367 | } | |
13d77c37 | 368 | put_task_struct(task); |
9745512c AV |
369 | return 0; |
370 | } | |
371 | ||
372 | static int lstats_open(struct inode *inode, struct file *file) | |
373 | { | |
13d77c37 | 374 | return single_open(file, lstats_show_proc, inode); |
d6643d12 HS |
375 | } |
376 | ||
9745512c AV |
377 | static ssize_t lstats_write(struct file *file, const char __user *buf, |
378 | size_t count, loff_t *offs) | |
379 | { | |
13d77c37 | 380 | struct task_struct *task = get_proc_task(file->f_dentry->d_inode); |
9745512c | 381 | |
13d77c37 HS |
382 | if (!task) |
383 | return -ESRCH; | |
9745512c | 384 | clear_all_latency_tracing(task); |
13d77c37 | 385 | put_task_struct(task); |
9745512c AV |
386 | |
387 | return count; | |
388 | } | |
389 | ||
390 | static const struct file_operations proc_lstats_operations = { | |
391 | .open = lstats_open, | |
392 | .read = seq_read, | |
393 | .write = lstats_write, | |
394 | .llseek = seq_lseek, | |
13d77c37 | 395 | .release = single_release, |
9745512c AV |
396 | }; |
397 | ||
398 | #endif | |
399 | ||
1da177e4 LT |
400 | /* The badness from the OOM killer */ |
401 | unsigned long badness(struct task_struct *p, unsigned long uptime); | |
402 | static int proc_oom_score(struct task_struct *task, char *buffer) | |
403 | { | |
404 | unsigned long points; | |
405 | struct timespec uptime; | |
406 | ||
407 | do_posix_clock_monotonic_gettime(&uptime); | |
19c5d45a | 408 | read_lock(&tasklist_lock); |
1da177e4 | 409 | points = badness(task, uptime.tv_sec); |
19c5d45a | 410 | read_unlock(&tasklist_lock); |
1da177e4 LT |
411 | return sprintf(buffer, "%lu\n", points); |
412 | } | |
413 | ||
d85f50d5 NH |
414 | struct limit_names { |
415 | char *name; | |
416 | char *unit; | |
417 | }; | |
418 | ||
419 | static const struct limit_names lnames[RLIM_NLIMITS] = { | |
420 | [RLIMIT_CPU] = {"Max cpu time", "ms"}, | |
421 | [RLIMIT_FSIZE] = {"Max file size", "bytes"}, | |
422 | [RLIMIT_DATA] = {"Max data size", "bytes"}, | |
423 | [RLIMIT_STACK] = {"Max stack size", "bytes"}, | |
424 | [RLIMIT_CORE] = {"Max core file size", "bytes"}, | |
425 | [RLIMIT_RSS] = {"Max resident set", "bytes"}, | |
426 | [RLIMIT_NPROC] = {"Max processes", "processes"}, | |
427 | [RLIMIT_NOFILE] = {"Max open files", "files"}, | |
428 | [RLIMIT_MEMLOCK] = {"Max locked memory", "bytes"}, | |
429 | [RLIMIT_AS] = {"Max address space", "bytes"}, | |
430 | [RLIMIT_LOCKS] = {"Max file locks", "locks"}, | |
431 | [RLIMIT_SIGPENDING] = {"Max pending signals", "signals"}, | |
432 | [RLIMIT_MSGQUEUE] = {"Max msgqueue size", "bytes"}, | |
433 | [RLIMIT_NICE] = {"Max nice priority", NULL}, | |
434 | [RLIMIT_RTPRIO] = {"Max realtime priority", NULL}, | |
8808117c | 435 | [RLIMIT_RTTIME] = {"Max realtime timeout", "us"}, |
d85f50d5 NH |
436 | }; |
437 | ||
438 | /* Display limits for a process */ | |
439 | static int proc_pid_limits(struct task_struct *task, char *buffer) | |
440 | { | |
441 | unsigned int i; | |
442 | int count = 0; | |
443 | unsigned long flags; | |
444 | char *bufptr = buffer; | |
445 | ||
446 | struct rlimit rlim[RLIM_NLIMITS]; | |
447 | ||
448 | rcu_read_lock(); | |
449 | if (!lock_task_sighand(task,&flags)) { | |
450 | rcu_read_unlock(); | |
451 | return 0; | |
452 | } | |
453 | memcpy(rlim, task->signal->rlim, sizeof(struct rlimit) * RLIM_NLIMITS); | |
454 | unlock_task_sighand(task, &flags); | |
455 | rcu_read_unlock(); | |
456 | ||
457 | /* | |
458 | * print the file header | |
459 | */ | |
460 | count += sprintf(&bufptr[count], "%-25s %-20s %-20s %-10s\n", | |
461 | "Limit", "Soft Limit", "Hard Limit", "Units"); | |
462 | ||
463 | for (i = 0; i < RLIM_NLIMITS; i++) { | |
464 | if (rlim[i].rlim_cur == RLIM_INFINITY) | |
465 | count += sprintf(&bufptr[count], "%-25s %-20s ", | |
466 | lnames[i].name, "unlimited"); | |
467 | else | |
468 | count += sprintf(&bufptr[count], "%-25s %-20lu ", | |
469 | lnames[i].name, rlim[i].rlim_cur); | |
470 | ||
471 | if (rlim[i].rlim_max == RLIM_INFINITY) | |
472 | count += sprintf(&bufptr[count], "%-20s ", "unlimited"); | |
473 | else | |
474 | count += sprintf(&bufptr[count], "%-20lu ", | |
475 | rlim[i].rlim_max); | |
476 | ||
477 | if (lnames[i].unit) | |
478 | count += sprintf(&bufptr[count], "%-10s\n", | |
479 | lnames[i].unit); | |
480 | else | |
481 | count += sprintf(&bufptr[count], "\n"); | |
482 | } | |
483 | ||
484 | return count; | |
485 | } | |
486 | ||
1da177e4 LT |
487 | /************************************************************************/ |
488 | /* Here the fs part begins */ | |
489 | /************************************************************************/ | |
490 | ||
491 | /* permission checks */ | |
778c1144 | 492 | static int proc_fd_access_allowed(struct inode *inode) |
1da177e4 | 493 | { |
778c1144 EB |
494 | struct task_struct *task; |
495 | int allowed = 0; | |
df26c40e EB |
496 | /* Allow access to a task's file descriptors if it is us or we |
497 | * may use ptrace attach to the process and find out that | |
498 | * information. | |
778c1144 EB |
499 | */ |
500 | task = get_proc_task(inode); | |
df26c40e EB |
501 | if (task) { |
502 | allowed = ptrace_may_attach(task); | |
778c1144 | 503 | put_task_struct(task); |
df26c40e | 504 | } |
778c1144 | 505 | return allowed; |
1da177e4 LT |
506 | } |
507 | ||
6d76fa58 LT |
508 | static int proc_setattr(struct dentry *dentry, struct iattr *attr) |
509 | { | |
510 | int error; | |
511 | struct inode *inode = dentry->d_inode; | |
512 | ||
513 | if (attr->ia_valid & ATTR_MODE) | |
514 | return -EPERM; | |
515 | ||
516 | error = inode_change_ok(inode, attr); | |
1e8123fd JJ |
517 | if (!error) |
518 | error = inode_setattr(inode, attr); | |
6d76fa58 LT |
519 | return error; |
520 | } | |
521 | ||
c5ef1c42 | 522 | static const struct inode_operations proc_def_inode_operations = { |
6d76fa58 LT |
523 | .setattr = proc_setattr, |
524 | }; | |
525 | ||
a1a2c409 MS |
526 | static int mounts_open_common(struct inode *inode, struct file *file, |
527 | const struct seq_operations *op) | |
1da177e4 | 528 | { |
99f89551 | 529 | struct task_struct *task = get_proc_task(inode); |
cf7b708c | 530 | struct nsproxy *nsp; |
6b3286ed | 531 | struct mnt_namespace *ns = NULL; |
a1a2c409 MS |
532 | struct fs_struct *fs = NULL; |
533 | struct path root; | |
5addc5dd AV |
534 | struct proc_mounts *p; |
535 | int ret = -EINVAL; | |
1da177e4 | 536 | |
99f89551 | 537 | if (task) { |
cf7b708c PE |
538 | rcu_read_lock(); |
539 | nsp = task_nsproxy(task); | |
540 | if (nsp) { | |
541 | ns = nsp->mnt_ns; | |
863c4702 AD |
542 | if (ns) |
543 | get_mnt_ns(ns); | |
544 | } | |
cf7b708c | 545 | rcu_read_unlock(); |
a1a2c409 MS |
546 | if (ns) |
547 | fs = get_fs_struct(task); | |
99f89551 EB |
548 | put_task_struct(task); |
549 | } | |
5addc5dd | 550 | |
a1a2c409 MS |
551 | if (!ns) |
552 | goto err; | |
553 | if (!fs) | |
554 | goto err_put_ns; | |
555 | ||
556 | read_lock(&fs->lock); | |
557 | root = fs->root; | |
558 | path_get(&root); | |
559 | read_unlock(&fs->lock); | |
560 | put_fs_struct(fs); | |
561 | ||
562 | ret = -ENOMEM; | |
563 | p = kmalloc(sizeof(struct proc_mounts), GFP_KERNEL); | |
564 | if (!p) | |
565 | goto err_put_path; | |
566 | ||
567 | file->private_data = &p->m; | |
568 | ret = seq_open(file, op); | |
569 | if (ret) | |
570 | goto err_free; | |
571 | ||
572 | p->m.private = p; | |
573 | p->ns = ns; | |
574 | p->root = root; | |
575 | p->event = ns->event; | |
576 | ||
577 | return 0; | |
578 | ||
579 | err_free: | |
580 | kfree(p); | |
581 | err_put_path: | |
582 | path_put(&root); | |
583 | err_put_ns: | |
584 | put_mnt_ns(ns); | |
585 | err: | |
1da177e4 LT |
586 | return ret; |
587 | } | |
588 | ||
589 | static int mounts_release(struct inode *inode, struct file *file) | |
590 | { | |
a1a2c409 MS |
591 | struct proc_mounts *p = file->private_data; |
592 | path_put(&p->root); | |
593 | put_mnt_ns(p->ns); | |
1da177e4 LT |
594 | return seq_release(inode, file); |
595 | } | |
596 | ||
5addc5dd AV |
597 | static unsigned mounts_poll(struct file *file, poll_table *wait) |
598 | { | |
599 | struct proc_mounts *p = file->private_data; | |
a1a2c409 | 600 | struct mnt_namespace *ns = p->ns; |
5addc5dd AV |
601 | unsigned res = 0; |
602 | ||
603 | poll_wait(file, &ns->poll, wait); | |
604 | ||
605 | spin_lock(&vfsmount_lock); | |
606 | if (p->event != ns->event) { | |
607 | p->event = ns->event; | |
608 | res = POLLERR; | |
609 | } | |
610 | spin_unlock(&vfsmount_lock); | |
611 | ||
612 | return res; | |
613 | } | |
614 | ||
a1a2c409 MS |
615 | static int mounts_open(struct inode *inode, struct file *file) |
616 | { | |
617 | return mounts_open_common(inode, file, &mounts_op); | |
618 | } | |
619 | ||
00977a59 | 620 | static const struct file_operations proc_mounts_operations = { |
1da177e4 LT |
621 | .open = mounts_open, |
622 | .read = seq_read, | |
623 | .llseek = seq_lseek, | |
624 | .release = mounts_release, | |
5addc5dd | 625 | .poll = mounts_poll, |
1da177e4 LT |
626 | }; |
627 | ||
2d4d4864 RP |
628 | static int mountinfo_open(struct inode *inode, struct file *file) |
629 | { | |
630 | return mounts_open_common(inode, file, &mountinfo_op); | |
631 | } | |
632 | ||
633 | static const struct file_operations proc_mountinfo_operations = { | |
634 | .open = mountinfo_open, | |
635 | .read = seq_read, | |
636 | .llseek = seq_lseek, | |
637 | .release = mounts_release, | |
638 | .poll = mounts_poll, | |
639 | }; | |
640 | ||
b4629fe2 CL |
641 | static int mountstats_open(struct inode *inode, struct file *file) |
642 | { | |
a1a2c409 | 643 | return mounts_open_common(inode, file, &mountstats_op); |
b4629fe2 CL |
644 | } |
645 | ||
00977a59 | 646 | static const struct file_operations proc_mountstats_operations = { |
b4629fe2 CL |
647 | .open = mountstats_open, |
648 | .read = seq_read, | |
649 | .llseek = seq_lseek, | |
650 | .release = mounts_release, | |
651 | }; | |
652 | ||
1da177e4 LT |
653 | #define PROC_BLOCK_SIZE (3*1024) /* 4K page size but our output routines use some slack for overruns */ |
654 | ||
655 | static ssize_t proc_info_read(struct file * file, char __user * buf, | |
656 | size_t count, loff_t *ppos) | |
657 | { | |
2fddfeef | 658 | struct inode * inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
659 | unsigned long page; |
660 | ssize_t length; | |
99f89551 EB |
661 | struct task_struct *task = get_proc_task(inode); |
662 | ||
663 | length = -ESRCH; | |
664 | if (!task) | |
665 | goto out_no_task; | |
1da177e4 LT |
666 | |
667 | if (count > PROC_BLOCK_SIZE) | |
668 | count = PROC_BLOCK_SIZE; | |
99f89551 EB |
669 | |
670 | length = -ENOMEM; | |
e12ba74d | 671 | if (!(page = __get_free_page(GFP_TEMPORARY))) |
99f89551 | 672 | goto out; |
1da177e4 LT |
673 | |
674 | length = PROC_I(inode)->op.proc_read(task, (char*)page); | |
675 | ||
676 | if (length >= 0) | |
677 | length = simple_read_from_buffer(buf, count, ppos, (char *)page, length); | |
678 | free_page(page); | |
99f89551 EB |
679 | out: |
680 | put_task_struct(task); | |
681 | out_no_task: | |
1da177e4 LT |
682 | return length; |
683 | } | |
684 | ||
00977a59 | 685 | static const struct file_operations proc_info_file_operations = { |
1da177e4 LT |
686 | .read = proc_info_read, |
687 | }; | |
688 | ||
be614086 EB |
689 | static int proc_single_show(struct seq_file *m, void *v) |
690 | { | |
691 | struct inode *inode = m->private; | |
692 | struct pid_namespace *ns; | |
693 | struct pid *pid; | |
694 | struct task_struct *task; | |
695 | int ret; | |
696 | ||
697 | ns = inode->i_sb->s_fs_info; | |
698 | pid = proc_pid(inode); | |
699 | task = get_pid_task(pid, PIDTYPE_PID); | |
700 | if (!task) | |
701 | return -ESRCH; | |
702 | ||
703 | ret = PROC_I(inode)->op.proc_show(m, ns, pid, task); | |
704 | ||
705 | put_task_struct(task); | |
706 | return ret; | |
707 | } | |
708 | ||
709 | static int proc_single_open(struct inode *inode, struct file *filp) | |
710 | { | |
711 | int ret; | |
712 | ret = single_open(filp, proc_single_show, NULL); | |
713 | if (!ret) { | |
714 | struct seq_file *m = filp->private_data; | |
715 | ||
716 | m->private = inode; | |
717 | } | |
718 | return ret; | |
719 | } | |
720 | ||
721 | static const struct file_operations proc_single_file_operations = { | |
722 | .open = proc_single_open, | |
723 | .read = seq_read, | |
724 | .llseek = seq_lseek, | |
725 | .release = single_release, | |
726 | }; | |
727 | ||
1da177e4 LT |
728 | static int mem_open(struct inode* inode, struct file* file) |
729 | { | |
730 | file->private_data = (void*)((long)current->self_exec_id); | |
731 | return 0; | |
732 | } | |
733 | ||
734 | static ssize_t mem_read(struct file * file, char __user * buf, | |
735 | size_t count, loff_t *ppos) | |
736 | { | |
2fddfeef | 737 | struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode); |
1da177e4 LT |
738 | char *page; |
739 | unsigned long src = *ppos; | |
740 | int ret = -ESRCH; | |
741 | struct mm_struct *mm; | |
742 | ||
99f89551 EB |
743 | if (!task) |
744 | goto out_no_task; | |
745 | ||
638fa202 | 746 | if (check_mem_permission(task)) |
1da177e4 LT |
747 | goto out; |
748 | ||
749 | ret = -ENOMEM; | |
e12ba74d | 750 | page = (char *)__get_free_page(GFP_TEMPORARY); |
1da177e4 LT |
751 | if (!page) |
752 | goto out; | |
753 | ||
754 | ret = 0; | |
755 | ||
756 | mm = get_task_mm(task); | |
757 | if (!mm) | |
758 | goto out_free; | |
759 | ||
760 | ret = -EIO; | |
761 | ||
762 | if (file->private_data != (void*)((long)current->self_exec_id)) | |
763 | goto out_put; | |
764 | ||
765 | ret = 0; | |
766 | ||
767 | while (count > 0) { | |
768 | int this_len, retval; | |
769 | ||
770 | this_len = (count > PAGE_SIZE) ? PAGE_SIZE : count; | |
771 | retval = access_process_vm(task, src, page, this_len, 0); | |
638fa202 | 772 | if (!retval || check_mem_permission(task)) { |
1da177e4 LT |
773 | if (!ret) |
774 | ret = -EIO; | |
775 | break; | |
776 | } | |
777 | ||
778 | if (copy_to_user(buf, page, retval)) { | |
779 | ret = -EFAULT; | |
780 | break; | |
781 | } | |
782 | ||
783 | ret += retval; | |
784 | src += retval; | |
785 | buf += retval; | |
786 | count -= retval; | |
787 | } | |
788 | *ppos = src; | |
789 | ||
790 | out_put: | |
791 | mmput(mm); | |
792 | out_free: | |
793 | free_page((unsigned long) page); | |
794 | out: | |
99f89551 EB |
795 | put_task_struct(task); |
796 | out_no_task: | |
1da177e4 LT |
797 | return ret; |
798 | } | |
799 | ||
800 | #define mem_write NULL | |
801 | ||
802 | #ifndef mem_write | |
803 | /* This is a security hazard */ | |
63967fa9 | 804 | static ssize_t mem_write(struct file * file, const char __user *buf, |
1da177e4 LT |
805 | size_t count, loff_t *ppos) |
806 | { | |
f7ca54f4 | 807 | int copied; |
1da177e4 | 808 | char *page; |
2fddfeef | 809 | struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode); |
1da177e4 LT |
810 | unsigned long dst = *ppos; |
811 | ||
99f89551 EB |
812 | copied = -ESRCH; |
813 | if (!task) | |
814 | goto out_no_task; | |
815 | ||
638fa202 | 816 | if (check_mem_permission(task)) |
99f89551 | 817 | goto out; |
1da177e4 | 818 | |
99f89551 | 819 | copied = -ENOMEM; |
e12ba74d | 820 | page = (char *)__get_free_page(GFP_TEMPORARY); |
1da177e4 | 821 | if (!page) |
99f89551 | 822 | goto out; |
1da177e4 | 823 | |
f7ca54f4 | 824 | copied = 0; |
1da177e4 LT |
825 | while (count > 0) { |
826 | int this_len, retval; | |
827 | ||
828 | this_len = (count > PAGE_SIZE) ? PAGE_SIZE : count; | |
829 | if (copy_from_user(page, buf, this_len)) { | |
830 | copied = -EFAULT; | |
831 | break; | |
832 | } | |
833 | retval = access_process_vm(task, dst, page, this_len, 1); | |
834 | if (!retval) { | |
835 | if (!copied) | |
836 | copied = -EIO; | |
837 | break; | |
838 | } | |
839 | copied += retval; | |
840 | buf += retval; | |
841 | dst += retval; | |
842 | count -= retval; | |
843 | } | |
844 | *ppos = dst; | |
845 | free_page((unsigned long) page); | |
99f89551 EB |
846 | out: |
847 | put_task_struct(task); | |
848 | out_no_task: | |
1da177e4 LT |
849 | return copied; |
850 | } | |
851 | #endif | |
852 | ||
85863e47 | 853 | loff_t mem_lseek(struct file *file, loff_t offset, int orig) |
1da177e4 LT |
854 | { |
855 | switch (orig) { | |
856 | case 0: | |
857 | file->f_pos = offset; | |
858 | break; | |
859 | case 1: | |
860 | file->f_pos += offset; | |
861 | break; | |
862 | default: | |
863 | return -EINVAL; | |
864 | } | |
865 | force_successful_syscall_return(); | |
866 | return file->f_pos; | |
867 | } | |
868 | ||
00977a59 | 869 | static const struct file_operations proc_mem_operations = { |
1da177e4 LT |
870 | .llseek = mem_lseek, |
871 | .read = mem_read, | |
872 | .write = mem_write, | |
873 | .open = mem_open, | |
874 | }; | |
875 | ||
315e28c8 JP |
876 | static ssize_t environ_read(struct file *file, char __user *buf, |
877 | size_t count, loff_t *ppos) | |
878 | { | |
879 | struct task_struct *task = get_proc_task(file->f_dentry->d_inode); | |
880 | char *page; | |
881 | unsigned long src = *ppos; | |
882 | int ret = -ESRCH; | |
883 | struct mm_struct *mm; | |
884 | ||
885 | if (!task) | |
886 | goto out_no_task; | |
887 | ||
888 | if (!ptrace_may_attach(task)) | |
889 | goto out; | |
890 | ||
891 | ret = -ENOMEM; | |
892 | page = (char *)__get_free_page(GFP_TEMPORARY); | |
893 | if (!page) | |
894 | goto out; | |
895 | ||
896 | ret = 0; | |
897 | ||
898 | mm = get_task_mm(task); | |
899 | if (!mm) | |
900 | goto out_free; | |
901 | ||
902 | while (count > 0) { | |
903 | int this_len, retval, max_len; | |
904 | ||
905 | this_len = mm->env_end - (mm->env_start + src); | |
906 | ||
907 | if (this_len <= 0) | |
908 | break; | |
909 | ||
910 | max_len = (count > PAGE_SIZE) ? PAGE_SIZE : count; | |
911 | this_len = (this_len > max_len) ? max_len : this_len; | |
912 | ||
913 | retval = access_process_vm(task, (mm->env_start + src), | |
914 | page, this_len, 0); | |
915 | ||
916 | if (retval <= 0) { | |
917 | ret = retval; | |
918 | break; | |
919 | } | |
920 | ||
921 | if (copy_to_user(buf, page, retval)) { | |
922 | ret = -EFAULT; | |
923 | break; | |
924 | } | |
925 | ||
926 | ret += retval; | |
927 | src += retval; | |
928 | buf += retval; | |
929 | count -= retval; | |
930 | } | |
931 | *ppos = src; | |
932 | ||
933 | mmput(mm); | |
934 | out_free: | |
935 | free_page((unsigned long) page); | |
936 | out: | |
937 | put_task_struct(task); | |
938 | out_no_task: | |
939 | return ret; | |
940 | } | |
941 | ||
942 | static const struct file_operations proc_environ_operations = { | |
943 | .read = environ_read, | |
944 | }; | |
945 | ||
1da177e4 LT |
946 | static ssize_t oom_adjust_read(struct file *file, char __user *buf, |
947 | size_t count, loff_t *ppos) | |
948 | { | |
2fddfeef | 949 | struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode); |
8578cea7 | 950 | char buffer[PROC_NUMBUF]; |
1da177e4 | 951 | size_t len; |
99f89551 | 952 | int oom_adjust; |
1da177e4 | 953 | |
99f89551 EB |
954 | if (!task) |
955 | return -ESRCH; | |
956 | oom_adjust = task->oomkilladj; | |
957 | put_task_struct(task); | |
958 | ||
8578cea7 | 959 | len = snprintf(buffer, sizeof(buffer), "%i\n", oom_adjust); |
0c28f287 AM |
960 | |
961 | return simple_read_from_buffer(buf, count, ppos, buffer, len); | |
1da177e4 LT |
962 | } |
963 | ||
964 | static ssize_t oom_adjust_write(struct file *file, const char __user *buf, | |
965 | size_t count, loff_t *ppos) | |
966 | { | |
99f89551 | 967 | struct task_struct *task; |
8578cea7 | 968 | char buffer[PROC_NUMBUF], *end; |
1da177e4 LT |
969 | int oom_adjust; |
970 | ||
8578cea7 EB |
971 | memset(buffer, 0, sizeof(buffer)); |
972 | if (count > sizeof(buffer) - 1) | |
973 | count = sizeof(buffer) - 1; | |
1da177e4 LT |
974 | if (copy_from_user(buffer, buf, count)) |
975 | return -EFAULT; | |
976 | oom_adjust = simple_strtol(buffer, &end, 0); | |
8ac773b4 AD |
977 | if ((oom_adjust < OOM_ADJUST_MIN || oom_adjust > OOM_ADJUST_MAX) && |
978 | oom_adjust != OOM_DISABLE) | |
1da177e4 LT |
979 | return -EINVAL; |
980 | if (*end == '\n') | |
981 | end++; | |
2fddfeef | 982 | task = get_proc_task(file->f_path.dentry->d_inode); |
99f89551 EB |
983 | if (!task) |
984 | return -ESRCH; | |
8fb4fc68 GJ |
985 | if (oom_adjust < task->oomkilladj && !capable(CAP_SYS_RESOURCE)) { |
986 | put_task_struct(task); | |
987 | return -EACCES; | |
988 | } | |
1da177e4 | 989 | task->oomkilladj = oom_adjust; |
99f89551 | 990 | put_task_struct(task); |
1da177e4 LT |
991 | if (end - buffer == 0) |
992 | return -EIO; | |
993 | return end - buffer; | |
994 | } | |
995 | ||
00977a59 | 996 | static const struct file_operations proc_oom_adjust_operations = { |
1da177e4 LT |
997 | .read = oom_adjust_read, |
998 | .write = oom_adjust_write, | |
999 | }; | |
1000 | ||
1da177e4 LT |
1001 | #ifdef CONFIG_AUDITSYSCALL |
1002 | #define TMPBUFLEN 21 | |
1003 | static ssize_t proc_loginuid_read(struct file * file, char __user * buf, | |
1004 | size_t count, loff_t *ppos) | |
1005 | { | |
2fddfeef | 1006 | struct inode * inode = file->f_path.dentry->d_inode; |
99f89551 | 1007 | struct task_struct *task = get_proc_task(inode); |
1da177e4 LT |
1008 | ssize_t length; |
1009 | char tmpbuf[TMPBUFLEN]; | |
1010 | ||
99f89551 EB |
1011 | if (!task) |
1012 | return -ESRCH; | |
1da177e4 | 1013 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", |
0c11b942 | 1014 | audit_get_loginuid(task)); |
99f89551 | 1015 | put_task_struct(task); |
1da177e4 LT |
1016 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); |
1017 | } | |
1018 | ||
1019 | static ssize_t proc_loginuid_write(struct file * file, const char __user * buf, | |
1020 | size_t count, loff_t *ppos) | |
1021 | { | |
2fddfeef | 1022 | struct inode * inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
1023 | char *page, *tmp; |
1024 | ssize_t length; | |
1da177e4 LT |
1025 | uid_t loginuid; |
1026 | ||
1027 | if (!capable(CAP_AUDIT_CONTROL)) | |
1028 | return -EPERM; | |
1029 | ||
13b41b09 | 1030 | if (current != pid_task(proc_pid(inode), PIDTYPE_PID)) |
1da177e4 LT |
1031 | return -EPERM; |
1032 | ||
e0182909 AV |
1033 | if (count >= PAGE_SIZE) |
1034 | count = PAGE_SIZE - 1; | |
1da177e4 LT |
1035 | |
1036 | if (*ppos != 0) { | |
1037 | /* No partial writes. */ | |
1038 | return -EINVAL; | |
1039 | } | |
e12ba74d | 1040 | page = (char*)__get_free_page(GFP_TEMPORARY); |
1da177e4 LT |
1041 | if (!page) |
1042 | return -ENOMEM; | |
1043 | length = -EFAULT; | |
1044 | if (copy_from_user(page, buf, count)) | |
1045 | goto out_free_page; | |
1046 | ||
e0182909 | 1047 | page[count] = '\0'; |
1da177e4 LT |
1048 | loginuid = simple_strtoul(page, &tmp, 10); |
1049 | if (tmp == page) { | |
1050 | length = -EINVAL; | |
1051 | goto out_free_page; | |
1052 | ||
1053 | } | |
99f89551 | 1054 | length = audit_set_loginuid(current, loginuid); |
1da177e4 LT |
1055 | if (likely(length == 0)) |
1056 | length = count; | |
1057 | ||
1058 | out_free_page: | |
1059 | free_page((unsigned long) page); | |
1060 | return length; | |
1061 | } | |
1062 | ||
00977a59 | 1063 | static const struct file_operations proc_loginuid_operations = { |
1da177e4 LT |
1064 | .read = proc_loginuid_read, |
1065 | .write = proc_loginuid_write, | |
1066 | }; | |
1e0bd755 EP |
1067 | |
1068 | static ssize_t proc_sessionid_read(struct file * file, char __user * buf, | |
1069 | size_t count, loff_t *ppos) | |
1070 | { | |
1071 | struct inode * inode = file->f_path.dentry->d_inode; | |
1072 | struct task_struct *task = get_proc_task(inode); | |
1073 | ssize_t length; | |
1074 | char tmpbuf[TMPBUFLEN]; | |
1075 | ||
1076 | if (!task) | |
1077 | return -ESRCH; | |
1078 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", | |
1079 | audit_get_sessionid(task)); | |
1080 | put_task_struct(task); | |
1081 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
1082 | } | |
1083 | ||
1084 | static const struct file_operations proc_sessionid_operations = { | |
1085 | .read = proc_sessionid_read, | |
1086 | }; | |
1da177e4 LT |
1087 | #endif |
1088 | ||
f4f154fd AM |
1089 | #ifdef CONFIG_FAULT_INJECTION |
1090 | static ssize_t proc_fault_inject_read(struct file * file, char __user * buf, | |
1091 | size_t count, loff_t *ppos) | |
1092 | { | |
1093 | struct task_struct *task = get_proc_task(file->f_dentry->d_inode); | |
1094 | char buffer[PROC_NUMBUF]; | |
1095 | size_t len; | |
1096 | int make_it_fail; | |
f4f154fd AM |
1097 | |
1098 | if (!task) | |
1099 | return -ESRCH; | |
1100 | make_it_fail = task->make_it_fail; | |
1101 | put_task_struct(task); | |
1102 | ||
1103 | len = snprintf(buffer, sizeof(buffer), "%i\n", make_it_fail); | |
0c28f287 AM |
1104 | |
1105 | return simple_read_from_buffer(buf, count, ppos, buffer, len); | |
f4f154fd AM |
1106 | } |
1107 | ||
1108 | static ssize_t proc_fault_inject_write(struct file * file, | |
1109 | const char __user * buf, size_t count, loff_t *ppos) | |
1110 | { | |
1111 | struct task_struct *task; | |
1112 | char buffer[PROC_NUMBUF], *end; | |
1113 | int make_it_fail; | |
1114 | ||
1115 | if (!capable(CAP_SYS_RESOURCE)) | |
1116 | return -EPERM; | |
1117 | memset(buffer, 0, sizeof(buffer)); | |
1118 | if (count > sizeof(buffer) - 1) | |
1119 | count = sizeof(buffer) - 1; | |
1120 | if (copy_from_user(buffer, buf, count)) | |
1121 | return -EFAULT; | |
1122 | make_it_fail = simple_strtol(buffer, &end, 0); | |
1123 | if (*end == '\n') | |
1124 | end++; | |
1125 | task = get_proc_task(file->f_dentry->d_inode); | |
1126 | if (!task) | |
1127 | return -ESRCH; | |
1128 | task->make_it_fail = make_it_fail; | |
1129 | put_task_struct(task); | |
1130 | if (end - buffer == 0) | |
1131 | return -EIO; | |
1132 | return end - buffer; | |
1133 | } | |
1134 | ||
00977a59 | 1135 | static const struct file_operations proc_fault_inject_operations = { |
f4f154fd AM |
1136 | .read = proc_fault_inject_read, |
1137 | .write = proc_fault_inject_write, | |
1138 | }; | |
1139 | #endif | |
1140 | ||
9745512c | 1141 | |
43ae34cb IM |
1142 | #ifdef CONFIG_SCHED_DEBUG |
1143 | /* | |
1144 | * Print out various scheduling related per-task fields: | |
1145 | */ | |
1146 | static int sched_show(struct seq_file *m, void *v) | |
1147 | { | |
1148 | struct inode *inode = m->private; | |
1149 | struct task_struct *p; | |
1150 | ||
1151 | WARN_ON(!inode); | |
1152 | ||
1153 | p = get_proc_task(inode); | |
1154 | if (!p) | |
1155 | return -ESRCH; | |
1156 | proc_sched_show_task(p, m); | |
1157 | ||
1158 | put_task_struct(p); | |
1159 | ||
1160 | return 0; | |
1161 | } | |
1162 | ||
1163 | static ssize_t | |
1164 | sched_write(struct file *file, const char __user *buf, | |
1165 | size_t count, loff_t *offset) | |
1166 | { | |
1167 | struct inode *inode = file->f_path.dentry->d_inode; | |
1168 | struct task_struct *p; | |
1169 | ||
1170 | WARN_ON(!inode); | |
1171 | ||
1172 | p = get_proc_task(inode); | |
1173 | if (!p) | |
1174 | return -ESRCH; | |
1175 | proc_sched_set_task(p); | |
1176 | ||
1177 | put_task_struct(p); | |
1178 | ||
1179 | return count; | |
1180 | } | |
1181 | ||
1182 | static int sched_open(struct inode *inode, struct file *filp) | |
1183 | { | |
1184 | int ret; | |
1185 | ||
1186 | ret = single_open(filp, sched_show, NULL); | |
1187 | if (!ret) { | |
1188 | struct seq_file *m = filp->private_data; | |
1189 | ||
1190 | m->private = inode; | |
1191 | } | |
1192 | return ret; | |
1193 | } | |
1194 | ||
1195 | static const struct file_operations proc_pid_sched_operations = { | |
1196 | .open = sched_open, | |
1197 | .read = seq_read, | |
1198 | .write = sched_write, | |
1199 | .llseek = seq_lseek, | |
5ea473a1 | 1200 | .release = single_release, |
43ae34cb IM |
1201 | }; |
1202 | ||
1203 | #endif | |
1204 | ||
925d1c40 MH |
1205 | /* |
1206 | * We added or removed a vma mapping the executable. The vmas are only mapped | |
1207 | * during exec and are not mapped with the mmap system call. | |
1208 | * Callers must hold down_write() on the mm's mmap_sem for these | |
1209 | */ | |
1210 | void added_exe_file_vma(struct mm_struct *mm) | |
1211 | { | |
1212 | mm->num_exe_file_vmas++; | |
1213 | } | |
1214 | ||
1215 | void removed_exe_file_vma(struct mm_struct *mm) | |
1216 | { | |
1217 | mm->num_exe_file_vmas--; | |
1218 | if ((mm->num_exe_file_vmas == 0) && mm->exe_file){ | |
1219 | fput(mm->exe_file); | |
1220 | mm->exe_file = NULL; | |
1221 | } | |
1222 | ||
1223 | } | |
1224 | ||
1225 | void set_mm_exe_file(struct mm_struct *mm, struct file *new_exe_file) | |
1226 | { | |
1227 | if (new_exe_file) | |
1228 | get_file(new_exe_file); | |
1229 | if (mm->exe_file) | |
1230 | fput(mm->exe_file); | |
1231 | mm->exe_file = new_exe_file; | |
1232 | mm->num_exe_file_vmas = 0; | |
1233 | } | |
1234 | ||
1235 | struct file *get_mm_exe_file(struct mm_struct *mm) | |
1236 | { | |
1237 | struct file *exe_file; | |
1238 | ||
1239 | /* We need mmap_sem to protect against races with removal of | |
1240 | * VM_EXECUTABLE vmas */ | |
1241 | down_read(&mm->mmap_sem); | |
1242 | exe_file = mm->exe_file; | |
1243 | if (exe_file) | |
1244 | get_file(exe_file); | |
1245 | up_read(&mm->mmap_sem); | |
1246 | return exe_file; | |
1247 | } | |
1248 | ||
1249 | void dup_mm_exe_file(struct mm_struct *oldmm, struct mm_struct *newmm) | |
1250 | { | |
1251 | /* It's safe to write the exe_file pointer without exe_file_lock because | |
1252 | * this is called during fork when the task is not yet in /proc */ | |
1253 | newmm->exe_file = get_mm_exe_file(oldmm); | |
1254 | } | |
1255 | ||
1256 | static int proc_exe_link(struct inode *inode, struct path *exe_path) | |
1257 | { | |
1258 | struct task_struct *task; | |
1259 | struct mm_struct *mm; | |
1260 | struct file *exe_file; | |
1261 | ||
1262 | task = get_proc_task(inode); | |
1263 | if (!task) | |
1264 | return -ENOENT; | |
1265 | mm = get_task_mm(task); | |
1266 | put_task_struct(task); | |
1267 | if (!mm) | |
1268 | return -ENOENT; | |
1269 | exe_file = get_mm_exe_file(mm); | |
1270 | mmput(mm); | |
1271 | if (exe_file) { | |
1272 | *exe_path = exe_file->f_path; | |
1273 | path_get(&exe_file->f_path); | |
1274 | fput(exe_file); | |
1275 | return 0; | |
1276 | } else | |
1277 | return -ENOENT; | |
1278 | } | |
1279 | ||
008b150a | 1280 | static void *proc_pid_follow_link(struct dentry *dentry, struct nameidata *nd) |
1da177e4 LT |
1281 | { |
1282 | struct inode *inode = dentry->d_inode; | |
1283 | int error = -EACCES; | |
1284 | ||
1285 | /* We don't need a base pointer in the /proc filesystem */ | |
1d957f9b | 1286 | path_put(&nd->path); |
1da177e4 | 1287 | |
778c1144 EB |
1288 | /* Are we allowed to snoop on the tasks file descriptors? */ |
1289 | if (!proc_fd_access_allowed(inode)) | |
1da177e4 | 1290 | goto out; |
1da177e4 | 1291 | |
3dcd25f3 | 1292 | error = PROC_I(inode)->op.proc_get_link(inode, &nd->path); |
1da177e4 LT |
1293 | nd->last_type = LAST_BIND; |
1294 | out: | |
008b150a | 1295 | return ERR_PTR(error); |
1da177e4 LT |
1296 | } |
1297 | ||
3dcd25f3 | 1298 | static int do_proc_readlink(struct path *path, char __user *buffer, int buflen) |
1da177e4 | 1299 | { |
e12ba74d | 1300 | char *tmp = (char*)__get_free_page(GFP_TEMPORARY); |
3dcd25f3 | 1301 | char *pathname; |
1da177e4 LT |
1302 | int len; |
1303 | ||
1304 | if (!tmp) | |
1305 | return -ENOMEM; | |
0c28f287 | 1306 | |
cf28b486 | 1307 | pathname = d_path(path, tmp, PAGE_SIZE); |
3dcd25f3 JB |
1308 | len = PTR_ERR(pathname); |
1309 | if (IS_ERR(pathname)) | |
1da177e4 | 1310 | goto out; |
3dcd25f3 | 1311 | len = tmp + PAGE_SIZE - 1 - pathname; |
1da177e4 LT |
1312 | |
1313 | if (len > buflen) | |
1314 | len = buflen; | |
3dcd25f3 | 1315 | if (copy_to_user(buffer, pathname, len)) |
1da177e4 LT |
1316 | len = -EFAULT; |
1317 | out: | |
1318 | free_page((unsigned long)tmp); | |
1319 | return len; | |
1320 | } | |
1321 | ||
1322 | static int proc_pid_readlink(struct dentry * dentry, char __user * buffer, int buflen) | |
1323 | { | |
1324 | int error = -EACCES; | |
1325 | struct inode *inode = dentry->d_inode; | |
3dcd25f3 | 1326 | struct path path; |
1da177e4 | 1327 | |
778c1144 EB |
1328 | /* Are we allowed to snoop on the tasks file descriptors? */ |
1329 | if (!proc_fd_access_allowed(inode)) | |
1da177e4 | 1330 | goto out; |
1da177e4 | 1331 | |
3dcd25f3 | 1332 | error = PROC_I(inode)->op.proc_get_link(inode, &path); |
1da177e4 LT |
1333 | if (error) |
1334 | goto out; | |
1335 | ||
3dcd25f3 JB |
1336 | error = do_proc_readlink(&path, buffer, buflen); |
1337 | path_put(&path); | |
1da177e4 | 1338 | out: |
1da177e4 LT |
1339 | return error; |
1340 | } | |
1341 | ||
c5ef1c42 | 1342 | static const struct inode_operations proc_pid_link_inode_operations = { |
1da177e4 | 1343 | .readlink = proc_pid_readlink, |
6d76fa58 LT |
1344 | .follow_link = proc_pid_follow_link, |
1345 | .setattr = proc_setattr, | |
1da177e4 LT |
1346 | }; |
1347 | ||
28a6d671 EB |
1348 | |
1349 | /* building an inode */ | |
1350 | ||
1351 | static int task_dumpable(struct task_struct *task) | |
1da177e4 | 1352 | { |
28a6d671 EB |
1353 | int dumpable = 0; |
1354 | struct mm_struct *mm; | |
1da177e4 | 1355 | |
28a6d671 EB |
1356 | task_lock(task); |
1357 | mm = task->mm; | |
1358 | if (mm) | |
6c5d5238 | 1359 | dumpable = get_dumpable(mm); |
28a6d671 EB |
1360 | task_unlock(task); |
1361 | if(dumpable == 1) | |
1362 | return 1; | |
1363 | return 0; | |
1364 | } | |
1da177e4 | 1365 | |
1da177e4 | 1366 | |
61a28784 | 1367 | static struct inode *proc_pid_make_inode(struct super_block * sb, struct task_struct *task) |
28a6d671 EB |
1368 | { |
1369 | struct inode * inode; | |
1370 | struct proc_inode *ei; | |
1da177e4 | 1371 | |
28a6d671 | 1372 | /* We need a new inode */ |
1da177e4 | 1373 | |
28a6d671 EB |
1374 | inode = new_inode(sb); |
1375 | if (!inode) | |
1376 | goto out; | |
1377 | ||
1378 | /* Common stuff */ | |
1379 | ei = PROC_I(inode); | |
1380 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; | |
28a6d671 EB |
1381 | inode->i_op = &proc_def_inode_operations; |
1382 | ||
1383 | /* | |
1384 | * grab the reference to task. | |
1385 | */ | |
1a657f78 | 1386 | ei->pid = get_task_pid(task, PIDTYPE_PID); |
28a6d671 EB |
1387 | if (!ei->pid) |
1388 | goto out_unlock; | |
1389 | ||
1390 | inode->i_uid = 0; | |
1391 | inode->i_gid = 0; | |
1392 | if (task_dumpable(task)) { | |
1393 | inode->i_uid = task->euid; | |
1394 | inode->i_gid = task->egid; | |
1da177e4 | 1395 | } |
28a6d671 EB |
1396 | security_task_to_inode(task, inode); |
1397 | ||
1da177e4 | 1398 | out: |
28a6d671 EB |
1399 | return inode; |
1400 | ||
1401 | out_unlock: | |
1402 | iput(inode); | |
1403 | return NULL; | |
1da177e4 LT |
1404 | } |
1405 | ||
28a6d671 | 1406 | static int pid_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) |
1da177e4 | 1407 | { |
1da177e4 | 1408 | struct inode *inode = dentry->d_inode; |
28a6d671 EB |
1409 | struct task_struct *task; |
1410 | generic_fillattr(inode, stat); | |
1da177e4 | 1411 | |
28a6d671 EB |
1412 | rcu_read_lock(); |
1413 | stat->uid = 0; | |
1414 | stat->gid = 0; | |
1415 | task = pid_task(proc_pid(inode), PIDTYPE_PID); | |
1416 | if (task) { | |
1417 | if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) || | |
1418 | task_dumpable(task)) { | |
1419 | stat->uid = task->euid; | |
1420 | stat->gid = task->egid; | |
1da177e4 LT |
1421 | } |
1422 | } | |
28a6d671 | 1423 | rcu_read_unlock(); |
d6e71144 | 1424 | return 0; |
1da177e4 LT |
1425 | } |
1426 | ||
1da177e4 LT |
1427 | /* dentry stuff */ |
1428 | ||
1429 | /* | |
1430 | * Exceptional case: normally we are not allowed to unhash a busy | |
1431 | * directory. In this case, however, we can do it - no aliasing problems | |
1432 | * due to the way we treat inodes. | |
1433 | * | |
1434 | * Rewrite the inode's ownerships here because the owning task may have | |
1435 | * performed a setuid(), etc. | |
99f89551 EB |
1436 | * |
1437 | * Before the /proc/pid/status file was created the only way to read | |
1438 | * the effective uid of a /process was to stat /proc/pid. Reading | |
1439 | * /proc/pid/status is slow enough that procps and other packages | |
1440 | * kept stating /proc/pid. To keep the rules in /proc simple I have | |
1441 | * made this apply to all per process world readable and executable | |
1442 | * directories. | |
1da177e4 LT |
1443 | */ |
1444 | static int pid_revalidate(struct dentry *dentry, struct nameidata *nd) | |
1445 | { | |
1446 | struct inode *inode = dentry->d_inode; | |
99f89551 EB |
1447 | struct task_struct *task = get_proc_task(inode); |
1448 | if (task) { | |
1449 | if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) || | |
1450 | task_dumpable(task)) { | |
1da177e4 LT |
1451 | inode->i_uid = task->euid; |
1452 | inode->i_gid = task->egid; | |
1453 | } else { | |
1454 | inode->i_uid = 0; | |
1455 | inode->i_gid = 0; | |
1456 | } | |
9ee8ab9f | 1457 | inode->i_mode &= ~(S_ISUID | S_ISGID); |
1da177e4 | 1458 | security_task_to_inode(task, inode); |
99f89551 | 1459 | put_task_struct(task); |
1da177e4 LT |
1460 | return 1; |
1461 | } | |
1462 | d_drop(dentry); | |
1463 | return 0; | |
1464 | } | |
1465 | ||
28a6d671 | 1466 | static int pid_delete_dentry(struct dentry * dentry) |
99f89551 | 1467 | { |
28a6d671 EB |
1468 | /* Is the task we represent dead? |
1469 | * If so, then don't put the dentry on the lru list, | |
1470 | * kill it immediately. | |
1471 | */ | |
1472 | return !proc_pid(dentry->d_inode)->tasks[PIDTYPE_PID].first; | |
1473 | } | |
1474 | ||
1475 | static struct dentry_operations pid_dentry_operations = | |
1476 | { | |
1477 | .d_revalidate = pid_revalidate, | |
1478 | .d_delete = pid_delete_dentry, | |
1479 | }; | |
1480 | ||
1481 | /* Lookups */ | |
1482 | ||
c5141e6d ED |
1483 | typedef struct dentry *instantiate_t(struct inode *, struct dentry *, |
1484 | struct task_struct *, const void *); | |
61a28784 | 1485 | |
1c0d04c9 EB |
1486 | /* |
1487 | * Fill a directory entry. | |
1488 | * | |
1489 | * If possible create the dcache entry and derive our inode number and | |
1490 | * file type from dcache entry. | |
1491 | * | |
1492 | * Since all of the proc inode numbers are dynamically generated, the inode | |
1493 | * numbers do not exist until the inode is cache. This means creating the | |
1494 | * the dcache entry in readdir is necessary to keep the inode numbers | |
1495 | * reported by readdir in sync with the inode numbers reported | |
1496 | * by stat. | |
1497 | */ | |
61a28784 EB |
1498 | static int proc_fill_cache(struct file *filp, void *dirent, filldir_t filldir, |
1499 | char *name, int len, | |
c5141e6d | 1500 | instantiate_t instantiate, struct task_struct *task, const void *ptr) |
61a28784 | 1501 | { |
2fddfeef | 1502 | struct dentry *child, *dir = filp->f_path.dentry; |
61a28784 EB |
1503 | struct inode *inode; |
1504 | struct qstr qname; | |
1505 | ino_t ino = 0; | |
1506 | unsigned type = DT_UNKNOWN; | |
1507 | ||
1508 | qname.name = name; | |
1509 | qname.len = len; | |
1510 | qname.hash = full_name_hash(name, len); | |
1511 | ||
1512 | child = d_lookup(dir, &qname); | |
1513 | if (!child) { | |
1514 | struct dentry *new; | |
1515 | new = d_alloc(dir, &qname); | |
1516 | if (new) { | |
1517 | child = instantiate(dir->d_inode, new, task, ptr); | |
1518 | if (child) | |
1519 | dput(new); | |
1520 | else | |
1521 | child = new; | |
1522 | } | |
1523 | } | |
1524 | if (!child || IS_ERR(child) || !child->d_inode) | |
1525 | goto end_instantiate; | |
1526 | inode = child->d_inode; | |
1527 | if (inode) { | |
1528 | ino = inode->i_ino; | |
1529 | type = inode->i_mode >> 12; | |
1530 | } | |
1531 | dput(child); | |
1532 | end_instantiate: | |
1533 | if (!ino) | |
1534 | ino = find_inode_number(dir, &qname); | |
1535 | if (!ino) | |
1536 | ino = 1; | |
1537 | return filldir(dirent, name, len, filp->f_pos, ino, type); | |
1538 | } | |
1539 | ||
28a6d671 EB |
1540 | static unsigned name_to_int(struct dentry *dentry) |
1541 | { | |
1542 | const char *name = dentry->d_name.name; | |
1543 | int len = dentry->d_name.len; | |
1544 | unsigned n = 0; | |
1545 | ||
1546 | if (len > 1 && *name == '0') | |
1547 | goto out; | |
1548 | while (len-- > 0) { | |
1549 | unsigned c = *name++ - '0'; | |
1550 | if (c > 9) | |
1551 | goto out; | |
1552 | if (n >= (~0U-9)/10) | |
1553 | goto out; | |
1554 | n *= 10; | |
1555 | n += c; | |
1556 | } | |
1557 | return n; | |
1558 | out: | |
1559 | return ~0U; | |
1560 | } | |
1561 | ||
27932742 MS |
1562 | #define PROC_FDINFO_MAX 64 |
1563 | ||
3dcd25f3 | 1564 | static int proc_fd_info(struct inode *inode, struct path *path, char *info) |
28a6d671 EB |
1565 | { |
1566 | struct task_struct *task = get_proc_task(inode); | |
1567 | struct files_struct *files = NULL; | |
1568 | struct file *file; | |
1569 | int fd = proc_fd(inode); | |
99f89551 | 1570 | |
99f89551 | 1571 | if (task) { |
28a6d671 EB |
1572 | files = get_files_struct(task); |
1573 | put_task_struct(task); | |
1574 | } | |
1575 | if (files) { | |
1576 | /* | |
1577 | * We are not taking a ref to the file structure, so we must | |
1578 | * hold ->file_lock. | |
1579 | */ | |
1580 | spin_lock(&files->file_lock); | |
1581 | file = fcheck_files(files, fd); | |
1582 | if (file) { | |
3dcd25f3 JB |
1583 | if (path) { |
1584 | *path = file->f_path; | |
1585 | path_get(&file->f_path); | |
1586 | } | |
27932742 MS |
1587 | if (info) |
1588 | snprintf(info, PROC_FDINFO_MAX, | |
1589 | "pos:\t%lli\n" | |
1590 | "flags:\t0%o\n", | |
1591 | (long long) file->f_pos, | |
1592 | file->f_flags); | |
28a6d671 EB |
1593 | spin_unlock(&files->file_lock); |
1594 | put_files_struct(files); | |
1595 | return 0; | |
99f89551 | 1596 | } |
28a6d671 EB |
1597 | spin_unlock(&files->file_lock); |
1598 | put_files_struct(files); | |
99f89551 | 1599 | } |
28a6d671 | 1600 | return -ENOENT; |
99f89551 EB |
1601 | } |
1602 | ||
3dcd25f3 | 1603 | static int proc_fd_link(struct inode *inode, struct path *path) |
27932742 | 1604 | { |
3dcd25f3 | 1605 | return proc_fd_info(inode, path, NULL); |
27932742 MS |
1606 | } |
1607 | ||
1da177e4 LT |
1608 | static int tid_fd_revalidate(struct dentry *dentry, struct nameidata *nd) |
1609 | { | |
1610 | struct inode *inode = dentry->d_inode; | |
99f89551 | 1611 | struct task_struct *task = get_proc_task(inode); |
aed7a6c4 | 1612 | int fd = proc_fd(inode); |
1da177e4 LT |
1613 | struct files_struct *files; |
1614 | ||
99f89551 EB |
1615 | if (task) { |
1616 | files = get_files_struct(task); | |
1617 | if (files) { | |
1618 | rcu_read_lock(); | |
1619 | if (fcheck_files(files, fd)) { | |
1620 | rcu_read_unlock(); | |
1621 | put_files_struct(files); | |
1622 | if (task_dumpable(task)) { | |
1623 | inode->i_uid = task->euid; | |
1624 | inode->i_gid = task->egid; | |
1625 | } else { | |
1626 | inode->i_uid = 0; | |
1627 | inode->i_gid = 0; | |
1628 | } | |
9ee8ab9f | 1629 | inode->i_mode &= ~(S_ISUID | S_ISGID); |
99f89551 EB |
1630 | security_task_to_inode(task, inode); |
1631 | put_task_struct(task); | |
1632 | return 1; | |
1633 | } | |
b835996f | 1634 | rcu_read_unlock(); |
1da177e4 | 1635 | put_files_struct(files); |
1da177e4 | 1636 | } |
99f89551 | 1637 | put_task_struct(task); |
1da177e4 LT |
1638 | } |
1639 | d_drop(dentry); | |
1640 | return 0; | |
1641 | } | |
1642 | ||
1da177e4 LT |
1643 | static struct dentry_operations tid_fd_dentry_operations = |
1644 | { | |
1645 | .d_revalidate = tid_fd_revalidate, | |
1646 | .d_delete = pid_delete_dentry, | |
1647 | }; | |
1648 | ||
444ceed8 | 1649 | static struct dentry *proc_fd_instantiate(struct inode *dir, |
c5141e6d | 1650 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
1da177e4 | 1651 | { |
c5141e6d | 1652 | unsigned fd = *(const unsigned *)ptr; |
444ceed8 EB |
1653 | struct file *file; |
1654 | struct files_struct *files; | |
1655 | struct inode *inode; | |
1656 | struct proc_inode *ei; | |
1657 | struct dentry *error = ERR_PTR(-ENOENT); | |
1da177e4 | 1658 | |
61a28784 | 1659 | inode = proc_pid_make_inode(dir->i_sb, task); |
1da177e4 LT |
1660 | if (!inode) |
1661 | goto out; | |
1662 | ei = PROC_I(inode); | |
aed7a6c4 | 1663 | ei->fd = fd; |
1da177e4 LT |
1664 | files = get_files_struct(task); |
1665 | if (!files) | |
444ceed8 | 1666 | goto out_iput; |
1da177e4 | 1667 | inode->i_mode = S_IFLNK; |
ca99c1da DS |
1668 | |
1669 | /* | |
1670 | * We are not taking a ref to the file structure, so we must | |
1671 | * hold ->file_lock. | |
1672 | */ | |
1673 | spin_lock(&files->file_lock); | |
1da177e4 LT |
1674 | file = fcheck_files(files, fd); |
1675 | if (!file) | |
444ceed8 | 1676 | goto out_unlock; |
1da177e4 LT |
1677 | if (file->f_mode & 1) |
1678 | inode->i_mode |= S_IRUSR | S_IXUSR; | |
1679 | if (file->f_mode & 2) | |
1680 | inode->i_mode |= S_IWUSR | S_IXUSR; | |
ca99c1da | 1681 | spin_unlock(&files->file_lock); |
1da177e4 | 1682 | put_files_struct(files); |
444ceed8 | 1683 | |
1da177e4 LT |
1684 | inode->i_op = &proc_pid_link_inode_operations; |
1685 | inode->i_size = 64; | |
1686 | ei->op.proc_get_link = proc_fd_link; | |
1687 | dentry->d_op = &tid_fd_dentry_operations; | |
1688 | d_add(dentry, inode); | |
cd6a3ce9 EB |
1689 | /* Close the race of the process dying before we return the dentry */ |
1690 | if (tid_fd_revalidate(dentry, NULL)) | |
444ceed8 | 1691 | error = NULL; |
1da177e4 | 1692 | |
444ceed8 EB |
1693 | out: |
1694 | return error; | |
1695 | out_unlock: | |
ca99c1da | 1696 | spin_unlock(&files->file_lock); |
1da177e4 | 1697 | put_files_struct(files); |
444ceed8 | 1698 | out_iput: |
1da177e4 | 1699 | iput(inode); |
cd6a3ce9 | 1700 | goto out; |
1da177e4 LT |
1701 | } |
1702 | ||
27932742 MS |
1703 | static struct dentry *proc_lookupfd_common(struct inode *dir, |
1704 | struct dentry *dentry, | |
1705 | instantiate_t instantiate) | |
444ceed8 EB |
1706 | { |
1707 | struct task_struct *task = get_proc_task(dir); | |
1708 | unsigned fd = name_to_int(dentry); | |
1709 | struct dentry *result = ERR_PTR(-ENOENT); | |
1710 | ||
1711 | if (!task) | |
1712 | goto out_no_task; | |
1713 | if (fd == ~0U) | |
1714 | goto out; | |
1715 | ||
27932742 | 1716 | result = instantiate(dir, dentry, task, &fd); |
444ceed8 EB |
1717 | out: |
1718 | put_task_struct(task); | |
1719 | out_no_task: | |
1720 | return result; | |
1721 | } | |
1722 | ||
27932742 MS |
1723 | static int proc_readfd_common(struct file * filp, void * dirent, |
1724 | filldir_t filldir, instantiate_t instantiate) | |
28a6d671 | 1725 | { |
2fddfeef | 1726 | struct dentry *dentry = filp->f_path.dentry; |
28a6d671 EB |
1727 | struct inode *inode = dentry->d_inode; |
1728 | struct task_struct *p = get_proc_task(inode); | |
457c2510 | 1729 | unsigned int fd, ino; |
28a6d671 | 1730 | int retval; |
28a6d671 | 1731 | struct files_struct * files; |
1da177e4 | 1732 | |
28a6d671 EB |
1733 | retval = -ENOENT; |
1734 | if (!p) | |
1735 | goto out_no_task; | |
1736 | retval = 0; | |
28a6d671 EB |
1737 | |
1738 | fd = filp->f_pos; | |
1739 | switch (fd) { | |
1740 | case 0: | |
1741 | if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0) | |
1742 | goto out; | |
1743 | filp->f_pos++; | |
1744 | case 1: | |
1745 | ino = parent_ino(dentry); | |
1746 | if (filldir(dirent, "..", 2, 1, ino, DT_DIR) < 0) | |
1747 | goto out; | |
1748 | filp->f_pos++; | |
1749 | default: | |
1750 | files = get_files_struct(p); | |
1751 | if (!files) | |
1752 | goto out; | |
1753 | rcu_read_lock(); | |
28a6d671 | 1754 | for (fd = filp->f_pos-2; |
9b4f526c | 1755 | fd < files_fdtable(files)->max_fds; |
28a6d671 | 1756 | fd++, filp->f_pos++) { |
27932742 MS |
1757 | char name[PROC_NUMBUF]; |
1758 | int len; | |
28a6d671 EB |
1759 | |
1760 | if (!fcheck_files(files, fd)) | |
1761 | continue; | |
1762 | rcu_read_unlock(); | |
1763 | ||
27932742 MS |
1764 | len = snprintf(name, sizeof(name), "%d", fd); |
1765 | if (proc_fill_cache(filp, dirent, filldir, | |
1766 | name, len, instantiate, | |
1767 | p, &fd) < 0) { | |
28a6d671 EB |
1768 | rcu_read_lock(); |
1769 | break; | |
1770 | } | |
1771 | rcu_read_lock(); | |
1772 | } | |
1773 | rcu_read_unlock(); | |
1774 | put_files_struct(files); | |
1775 | } | |
1776 | out: | |
1777 | put_task_struct(p); | |
1778 | out_no_task: | |
1779 | return retval; | |
1780 | } | |
1781 | ||
27932742 MS |
1782 | static struct dentry *proc_lookupfd(struct inode *dir, struct dentry *dentry, |
1783 | struct nameidata *nd) | |
1784 | { | |
1785 | return proc_lookupfd_common(dir, dentry, proc_fd_instantiate); | |
1786 | } | |
1787 | ||
1788 | static int proc_readfd(struct file *filp, void *dirent, filldir_t filldir) | |
1789 | { | |
1790 | return proc_readfd_common(filp, dirent, filldir, proc_fd_instantiate); | |
1791 | } | |
1792 | ||
1793 | static ssize_t proc_fdinfo_read(struct file *file, char __user *buf, | |
1794 | size_t len, loff_t *ppos) | |
1795 | { | |
1796 | char tmp[PROC_FDINFO_MAX]; | |
3dcd25f3 | 1797 | int err = proc_fd_info(file->f_path.dentry->d_inode, NULL, tmp); |
27932742 MS |
1798 | if (!err) |
1799 | err = simple_read_from_buffer(buf, len, ppos, tmp, strlen(tmp)); | |
1800 | return err; | |
1801 | } | |
1802 | ||
1803 | static const struct file_operations proc_fdinfo_file_operations = { | |
1804 | .open = nonseekable_open, | |
1805 | .read = proc_fdinfo_read, | |
1806 | }; | |
1807 | ||
00977a59 | 1808 | static const struct file_operations proc_fd_operations = { |
28a6d671 EB |
1809 | .read = generic_read_dir, |
1810 | .readdir = proc_readfd, | |
1da177e4 LT |
1811 | }; |
1812 | ||
8948e11f AD |
1813 | /* |
1814 | * /proc/pid/fd needs a special permission handler so that a process can still | |
1815 | * access /proc/self/fd after it has executed a setuid(). | |
1816 | */ | |
1817 | static int proc_fd_permission(struct inode *inode, int mask, | |
1818 | struct nameidata *nd) | |
1819 | { | |
1820 | int rv; | |
1821 | ||
1822 | rv = generic_permission(inode, mask, NULL); | |
1823 | if (rv == 0) | |
1824 | return 0; | |
1825 | if (task_pid(current) == proc_pid(inode)) | |
1826 | rv = 0; | |
1827 | return rv; | |
1828 | } | |
1829 | ||
1da177e4 LT |
1830 | /* |
1831 | * proc directories can do almost nothing.. | |
1832 | */ | |
c5ef1c42 | 1833 | static const struct inode_operations proc_fd_inode_operations = { |
1da177e4 | 1834 | .lookup = proc_lookupfd, |
8948e11f | 1835 | .permission = proc_fd_permission, |
6d76fa58 | 1836 | .setattr = proc_setattr, |
1da177e4 LT |
1837 | }; |
1838 | ||
27932742 MS |
1839 | static struct dentry *proc_fdinfo_instantiate(struct inode *dir, |
1840 | struct dentry *dentry, struct task_struct *task, const void *ptr) | |
1841 | { | |
1842 | unsigned fd = *(unsigned *)ptr; | |
1843 | struct inode *inode; | |
1844 | struct proc_inode *ei; | |
1845 | struct dentry *error = ERR_PTR(-ENOENT); | |
1846 | ||
1847 | inode = proc_pid_make_inode(dir->i_sb, task); | |
1848 | if (!inode) | |
1849 | goto out; | |
1850 | ei = PROC_I(inode); | |
1851 | ei->fd = fd; | |
1852 | inode->i_mode = S_IFREG | S_IRUSR; | |
1853 | inode->i_fop = &proc_fdinfo_file_operations; | |
1854 | dentry->d_op = &tid_fd_dentry_operations; | |
1855 | d_add(dentry, inode); | |
1856 | /* Close the race of the process dying before we return the dentry */ | |
1857 | if (tid_fd_revalidate(dentry, NULL)) | |
1858 | error = NULL; | |
1859 | ||
1860 | out: | |
1861 | return error; | |
1862 | } | |
1863 | ||
1864 | static struct dentry *proc_lookupfdinfo(struct inode *dir, | |
1865 | struct dentry *dentry, | |
1866 | struct nameidata *nd) | |
1867 | { | |
1868 | return proc_lookupfd_common(dir, dentry, proc_fdinfo_instantiate); | |
1869 | } | |
1870 | ||
1871 | static int proc_readfdinfo(struct file *filp, void *dirent, filldir_t filldir) | |
1872 | { | |
1873 | return proc_readfd_common(filp, dirent, filldir, | |
1874 | proc_fdinfo_instantiate); | |
1875 | } | |
1876 | ||
1877 | static const struct file_operations proc_fdinfo_operations = { | |
1878 | .read = generic_read_dir, | |
1879 | .readdir = proc_readfdinfo, | |
1880 | }; | |
1881 | ||
1882 | /* | |
1883 | * proc directories can do almost nothing.. | |
1884 | */ | |
1885 | static const struct inode_operations proc_fdinfo_inode_operations = { | |
1886 | .lookup = proc_lookupfdinfo, | |
1887 | .setattr = proc_setattr, | |
1888 | }; | |
1889 | ||
1890 | ||
444ceed8 | 1891 | static struct dentry *proc_pident_instantiate(struct inode *dir, |
c5141e6d | 1892 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
444ceed8 | 1893 | { |
c5141e6d | 1894 | const struct pid_entry *p = ptr; |
444ceed8 EB |
1895 | struct inode *inode; |
1896 | struct proc_inode *ei; | |
1897 | struct dentry *error = ERR_PTR(-EINVAL); | |
1898 | ||
61a28784 | 1899 | inode = proc_pid_make_inode(dir->i_sb, task); |
444ceed8 EB |
1900 | if (!inode) |
1901 | goto out; | |
1902 | ||
1903 | ei = PROC_I(inode); | |
1904 | inode->i_mode = p->mode; | |
1905 | if (S_ISDIR(inode->i_mode)) | |
1906 | inode->i_nlink = 2; /* Use getattr to fix if necessary */ | |
1907 | if (p->iop) | |
1908 | inode->i_op = p->iop; | |
1909 | if (p->fop) | |
1910 | inode->i_fop = p->fop; | |
1911 | ei->op = p->op; | |
1912 | dentry->d_op = &pid_dentry_operations; | |
1913 | d_add(dentry, inode); | |
1914 | /* Close the race of the process dying before we return the dentry */ | |
1915 | if (pid_revalidate(dentry, NULL)) | |
1916 | error = NULL; | |
1917 | out: | |
1918 | return error; | |
1919 | } | |
1920 | ||
1da177e4 LT |
1921 | static struct dentry *proc_pident_lookup(struct inode *dir, |
1922 | struct dentry *dentry, | |
c5141e6d | 1923 | const struct pid_entry *ents, |
7bcd6b0e | 1924 | unsigned int nents) |
1da177e4 LT |
1925 | { |
1926 | struct inode *inode; | |
cd6a3ce9 | 1927 | struct dentry *error; |
99f89551 | 1928 | struct task_struct *task = get_proc_task(dir); |
c5141e6d | 1929 | const struct pid_entry *p, *last; |
1da177e4 | 1930 | |
cd6a3ce9 | 1931 | error = ERR_PTR(-ENOENT); |
1da177e4 LT |
1932 | inode = NULL; |
1933 | ||
99f89551 EB |
1934 | if (!task) |
1935 | goto out_no_task; | |
1da177e4 | 1936 | |
20cdc894 EB |
1937 | /* |
1938 | * Yes, it does not scale. And it should not. Don't add | |
1939 | * new entries into /proc/<tgid>/ without very good reasons. | |
1940 | */ | |
7bcd6b0e EB |
1941 | last = &ents[nents - 1]; |
1942 | for (p = ents; p <= last; p++) { | |
1da177e4 LT |
1943 | if (p->len != dentry->d_name.len) |
1944 | continue; | |
1945 | if (!memcmp(dentry->d_name.name, p->name, p->len)) | |
1946 | break; | |
1947 | } | |
7bcd6b0e | 1948 | if (p > last) |
1da177e4 LT |
1949 | goto out; |
1950 | ||
444ceed8 | 1951 | error = proc_pident_instantiate(dir, dentry, task, p); |
1da177e4 | 1952 | out: |
99f89551 EB |
1953 | put_task_struct(task); |
1954 | out_no_task: | |
cd6a3ce9 | 1955 | return error; |
1da177e4 LT |
1956 | } |
1957 | ||
c5141e6d ED |
1958 | static int proc_pident_fill_cache(struct file *filp, void *dirent, |
1959 | filldir_t filldir, struct task_struct *task, const struct pid_entry *p) | |
61a28784 EB |
1960 | { |
1961 | return proc_fill_cache(filp, dirent, filldir, p->name, p->len, | |
1962 | proc_pident_instantiate, task, p); | |
1963 | } | |
1964 | ||
28a6d671 EB |
1965 | static int proc_pident_readdir(struct file *filp, |
1966 | void *dirent, filldir_t filldir, | |
c5141e6d | 1967 | const struct pid_entry *ents, unsigned int nents) |
28a6d671 EB |
1968 | { |
1969 | int i; | |
2fddfeef | 1970 | struct dentry *dentry = filp->f_path.dentry; |
28a6d671 EB |
1971 | struct inode *inode = dentry->d_inode; |
1972 | struct task_struct *task = get_proc_task(inode); | |
c5141e6d | 1973 | const struct pid_entry *p, *last; |
28a6d671 EB |
1974 | ino_t ino; |
1975 | int ret; | |
1976 | ||
1977 | ret = -ENOENT; | |
1978 | if (!task) | |
61a28784 | 1979 | goto out_no_task; |
28a6d671 EB |
1980 | |
1981 | ret = 0; | |
28a6d671 EB |
1982 | i = filp->f_pos; |
1983 | switch (i) { | |
1984 | case 0: | |
1985 | ino = inode->i_ino; | |
1986 | if (filldir(dirent, ".", 1, i, ino, DT_DIR) < 0) | |
1987 | goto out; | |
1988 | i++; | |
1989 | filp->f_pos++; | |
1990 | /* fall through */ | |
1991 | case 1: | |
1992 | ino = parent_ino(dentry); | |
1993 | if (filldir(dirent, "..", 2, i, ino, DT_DIR) < 0) | |
1994 | goto out; | |
1995 | i++; | |
1996 | filp->f_pos++; | |
1997 | /* fall through */ | |
1998 | default: | |
1999 | i -= 2; | |
2000 | if (i >= nents) { | |
2001 | ret = 1; | |
2002 | goto out; | |
2003 | } | |
2004 | p = ents + i; | |
7bcd6b0e EB |
2005 | last = &ents[nents - 1]; |
2006 | while (p <= last) { | |
61a28784 | 2007 | if (proc_pident_fill_cache(filp, dirent, filldir, task, p) < 0) |
28a6d671 EB |
2008 | goto out; |
2009 | filp->f_pos++; | |
2010 | p++; | |
2011 | } | |
2012 | } | |
2013 | ||
2014 | ret = 1; | |
2015 | out: | |
61a28784 EB |
2016 | put_task_struct(task); |
2017 | out_no_task: | |
28a6d671 | 2018 | return ret; |
1da177e4 LT |
2019 | } |
2020 | ||
28a6d671 EB |
2021 | #ifdef CONFIG_SECURITY |
2022 | static ssize_t proc_pid_attr_read(struct file * file, char __user * buf, | |
2023 | size_t count, loff_t *ppos) | |
2024 | { | |
2fddfeef | 2025 | struct inode * inode = file->f_path.dentry->d_inode; |
04ff9708 | 2026 | char *p = NULL; |
28a6d671 EB |
2027 | ssize_t length; |
2028 | struct task_struct *task = get_proc_task(inode); | |
2029 | ||
28a6d671 | 2030 | if (!task) |
04ff9708 | 2031 | return -ESRCH; |
28a6d671 EB |
2032 | |
2033 | length = security_getprocattr(task, | |
2fddfeef | 2034 | (char*)file->f_path.dentry->d_name.name, |
04ff9708 | 2035 | &p); |
28a6d671 | 2036 | put_task_struct(task); |
04ff9708 AV |
2037 | if (length > 0) |
2038 | length = simple_read_from_buffer(buf, count, ppos, p, length); | |
2039 | kfree(p); | |
28a6d671 | 2040 | return length; |
1da177e4 LT |
2041 | } |
2042 | ||
28a6d671 EB |
2043 | static ssize_t proc_pid_attr_write(struct file * file, const char __user * buf, |
2044 | size_t count, loff_t *ppos) | |
2045 | { | |
2fddfeef | 2046 | struct inode * inode = file->f_path.dentry->d_inode; |
28a6d671 EB |
2047 | char *page; |
2048 | ssize_t length; | |
2049 | struct task_struct *task = get_proc_task(inode); | |
2050 | ||
2051 | length = -ESRCH; | |
2052 | if (!task) | |
2053 | goto out_no_task; | |
2054 | if (count > PAGE_SIZE) | |
2055 | count = PAGE_SIZE; | |
2056 | ||
2057 | /* No partial writes. */ | |
2058 | length = -EINVAL; | |
2059 | if (*ppos != 0) | |
2060 | goto out; | |
2061 | ||
2062 | length = -ENOMEM; | |
e12ba74d | 2063 | page = (char*)__get_free_page(GFP_TEMPORARY); |
28a6d671 EB |
2064 | if (!page) |
2065 | goto out; | |
2066 | ||
2067 | length = -EFAULT; | |
2068 | if (copy_from_user(page, buf, count)) | |
2069 | goto out_free; | |
2070 | ||
2071 | length = security_setprocattr(task, | |
2fddfeef | 2072 | (char*)file->f_path.dentry->d_name.name, |
28a6d671 EB |
2073 | (void*)page, count); |
2074 | out_free: | |
2075 | free_page((unsigned long) page); | |
2076 | out: | |
2077 | put_task_struct(task); | |
2078 | out_no_task: | |
2079 | return length; | |
2080 | } | |
2081 | ||
00977a59 | 2082 | static const struct file_operations proc_pid_attr_operations = { |
28a6d671 EB |
2083 | .read = proc_pid_attr_read, |
2084 | .write = proc_pid_attr_write, | |
2085 | }; | |
2086 | ||
c5141e6d | 2087 | static const struct pid_entry attr_dir_stuff[] = { |
61a28784 EB |
2088 | REG("current", S_IRUGO|S_IWUGO, pid_attr), |
2089 | REG("prev", S_IRUGO, pid_attr), | |
2090 | REG("exec", S_IRUGO|S_IWUGO, pid_attr), | |
2091 | REG("fscreate", S_IRUGO|S_IWUGO, pid_attr), | |
2092 | REG("keycreate", S_IRUGO|S_IWUGO, pid_attr), | |
2093 | REG("sockcreate", S_IRUGO|S_IWUGO, pid_attr), | |
28a6d671 EB |
2094 | }; |
2095 | ||
72d9dcfc | 2096 | static int proc_attr_dir_readdir(struct file * filp, |
28a6d671 EB |
2097 | void * dirent, filldir_t filldir) |
2098 | { | |
2099 | return proc_pident_readdir(filp,dirent,filldir, | |
72d9dcfc | 2100 | attr_dir_stuff,ARRAY_SIZE(attr_dir_stuff)); |
28a6d671 EB |
2101 | } |
2102 | ||
00977a59 | 2103 | static const struct file_operations proc_attr_dir_operations = { |
1da177e4 | 2104 | .read = generic_read_dir, |
72d9dcfc | 2105 | .readdir = proc_attr_dir_readdir, |
1da177e4 LT |
2106 | }; |
2107 | ||
72d9dcfc | 2108 | static struct dentry *proc_attr_dir_lookup(struct inode *dir, |
28a6d671 EB |
2109 | struct dentry *dentry, struct nameidata *nd) |
2110 | { | |
7bcd6b0e EB |
2111 | return proc_pident_lookup(dir, dentry, |
2112 | attr_dir_stuff, ARRAY_SIZE(attr_dir_stuff)); | |
28a6d671 EB |
2113 | } |
2114 | ||
c5ef1c42 | 2115 | static const struct inode_operations proc_attr_dir_inode_operations = { |
72d9dcfc | 2116 | .lookup = proc_attr_dir_lookup, |
99f89551 | 2117 | .getattr = pid_getattr, |
6d76fa58 | 2118 | .setattr = proc_setattr, |
1da177e4 LT |
2119 | }; |
2120 | ||
28a6d671 EB |
2121 | #endif |
2122 | ||
3cb4a0bb KH |
2123 | #if defined(USE_ELF_CORE_DUMP) && defined(CONFIG_ELF_CORE) |
2124 | static ssize_t proc_coredump_filter_read(struct file *file, char __user *buf, | |
2125 | size_t count, loff_t *ppos) | |
2126 | { | |
2127 | struct task_struct *task = get_proc_task(file->f_dentry->d_inode); | |
2128 | struct mm_struct *mm; | |
2129 | char buffer[PROC_NUMBUF]; | |
2130 | size_t len; | |
2131 | int ret; | |
2132 | ||
2133 | if (!task) | |
2134 | return -ESRCH; | |
2135 | ||
2136 | ret = 0; | |
2137 | mm = get_task_mm(task); | |
2138 | if (mm) { | |
2139 | len = snprintf(buffer, sizeof(buffer), "%08lx\n", | |
2140 | ((mm->flags & MMF_DUMP_FILTER_MASK) >> | |
2141 | MMF_DUMP_FILTER_SHIFT)); | |
2142 | mmput(mm); | |
2143 | ret = simple_read_from_buffer(buf, count, ppos, buffer, len); | |
2144 | } | |
2145 | ||
2146 | put_task_struct(task); | |
2147 | ||
2148 | return ret; | |
2149 | } | |
2150 | ||
2151 | static ssize_t proc_coredump_filter_write(struct file *file, | |
2152 | const char __user *buf, | |
2153 | size_t count, | |
2154 | loff_t *ppos) | |
2155 | { | |
2156 | struct task_struct *task; | |
2157 | struct mm_struct *mm; | |
2158 | char buffer[PROC_NUMBUF], *end; | |
2159 | unsigned int val; | |
2160 | int ret; | |
2161 | int i; | |
2162 | unsigned long mask; | |
2163 | ||
2164 | ret = -EFAULT; | |
2165 | memset(buffer, 0, sizeof(buffer)); | |
2166 | if (count > sizeof(buffer) - 1) | |
2167 | count = sizeof(buffer) - 1; | |
2168 | if (copy_from_user(buffer, buf, count)) | |
2169 | goto out_no_task; | |
2170 | ||
2171 | ret = -EINVAL; | |
2172 | val = (unsigned int)simple_strtoul(buffer, &end, 0); | |
2173 | if (*end == '\n') | |
2174 | end++; | |
2175 | if (end - buffer == 0) | |
2176 | goto out_no_task; | |
2177 | ||
2178 | ret = -ESRCH; | |
2179 | task = get_proc_task(file->f_dentry->d_inode); | |
2180 | if (!task) | |
2181 | goto out_no_task; | |
2182 | ||
2183 | ret = end - buffer; | |
2184 | mm = get_task_mm(task); | |
2185 | if (!mm) | |
2186 | goto out_no_mm; | |
2187 | ||
2188 | for (i = 0, mask = 1; i < MMF_DUMP_FILTER_BITS; i++, mask <<= 1) { | |
2189 | if (val & mask) | |
2190 | set_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags); | |
2191 | else | |
2192 | clear_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags); | |
2193 | } | |
2194 | ||
2195 | mmput(mm); | |
2196 | out_no_mm: | |
2197 | put_task_struct(task); | |
2198 | out_no_task: | |
2199 | return ret; | |
2200 | } | |
2201 | ||
2202 | static const struct file_operations proc_coredump_filter_operations = { | |
2203 | .read = proc_coredump_filter_read, | |
2204 | .write = proc_coredump_filter_write, | |
2205 | }; | |
2206 | #endif | |
2207 | ||
28a6d671 EB |
2208 | /* |
2209 | * /proc/self: | |
2210 | */ | |
2211 | static int proc_self_readlink(struct dentry *dentry, char __user *buffer, | |
2212 | int buflen) | |
2213 | { | |
488e5bc4 | 2214 | struct pid_namespace *ns = dentry->d_sb->s_fs_info; |
b55fcb22 | 2215 | pid_t tgid = task_tgid_nr_ns(current, ns); |
28a6d671 | 2216 | char tmp[PROC_NUMBUF]; |
b55fcb22 | 2217 | if (!tgid) |
488e5bc4 | 2218 | return -ENOENT; |
b55fcb22 | 2219 | sprintf(tmp, "%d", tgid); |
28a6d671 EB |
2220 | return vfs_readlink(dentry,buffer,buflen,tmp); |
2221 | } | |
2222 | ||
2223 | static void *proc_self_follow_link(struct dentry *dentry, struct nameidata *nd) | |
2224 | { | |
488e5bc4 | 2225 | struct pid_namespace *ns = dentry->d_sb->s_fs_info; |
b55fcb22 | 2226 | pid_t tgid = task_tgid_nr_ns(current, ns); |
28a6d671 | 2227 | char tmp[PROC_NUMBUF]; |
b55fcb22 | 2228 | if (!tgid) |
488e5bc4 | 2229 | return ERR_PTR(-ENOENT); |
b55fcb22 | 2230 | sprintf(tmp, "%d", task_tgid_nr_ns(current, ns)); |
28a6d671 EB |
2231 | return ERR_PTR(vfs_follow_link(nd,tmp)); |
2232 | } | |
2233 | ||
c5ef1c42 | 2234 | static const struct inode_operations proc_self_inode_operations = { |
28a6d671 EB |
2235 | .readlink = proc_self_readlink, |
2236 | .follow_link = proc_self_follow_link, | |
2237 | }; | |
2238 | ||
801199ce EB |
2239 | /* |
2240 | * proc base | |
2241 | * | |
2242 | * These are the directory entries in the root directory of /proc | |
2243 | * that properly belong to the /proc filesystem, as they describe | |
2244 | * describe something that is process related. | |
2245 | */ | |
c5141e6d | 2246 | static const struct pid_entry proc_base_stuff[] = { |
61a28784 | 2247 | NOD("self", S_IFLNK|S_IRWXUGO, |
801199ce | 2248 | &proc_self_inode_operations, NULL, {}), |
801199ce EB |
2249 | }; |
2250 | ||
2251 | /* | |
2252 | * Exceptional case: normally we are not allowed to unhash a busy | |
2253 | * directory. In this case, however, we can do it - no aliasing problems | |
2254 | * due to the way we treat inodes. | |
2255 | */ | |
2256 | static int proc_base_revalidate(struct dentry *dentry, struct nameidata *nd) | |
2257 | { | |
2258 | struct inode *inode = dentry->d_inode; | |
2259 | struct task_struct *task = get_proc_task(inode); | |
2260 | if (task) { | |
2261 | put_task_struct(task); | |
2262 | return 1; | |
2263 | } | |
2264 | d_drop(dentry); | |
2265 | return 0; | |
2266 | } | |
2267 | ||
2268 | static struct dentry_operations proc_base_dentry_operations = | |
2269 | { | |
2270 | .d_revalidate = proc_base_revalidate, | |
2271 | .d_delete = pid_delete_dentry, | |
2272 | }; | |
2273 | ||
444ceed8 | 2274 | static struct dentry *proc_base_instantiate(struct inode *dir, |
c5141e6d | 2275 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
801199ce | 2276 | { |
c5141e6d | 2277 | const struct pid_entry *p = ptr; |
801199ce | 2278 | struct inode *inode; |
801199ce | 2279 | struct proc_inode *ei; |
444ceed8 | 2280 | struct dentry *error = ERR_PTR(-EINVAL); |
801199ce EB |
2281 | |
2282 | /* Allocate the inode */ | |
2283 | error = ERR_PTR(-ENOMEM); | |
2284 | inode = new_inode(dir->i_sb); | |
2285 | if (!inode) | |
2286 | goto out; | |
2287 | ||
2288 | /* Initialize the inode */ | |
2289 | ei = PROC_I(inode); | |
2290 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; | |
801199ce EB |
2291 | |
2292 | /* | |
2293 | * grab the reference to the task. | |
2294 | */ | |
1a657f78 | 2295 | ei->pid = get_task_pid(task, PIDTYPE_PID); |
801199ce EB |
2296 | if (!ei->pid) |
2297 | goto out_iput; | |
2298 | ||
2299 | inode->i_uid = 0; | |
2300 | inode->i_gid = 0; | |
2301 | inode->i_mode = p->mode; | |
2302 | if (S_ISDIR(inode->i_mode)) | |
2303 | inode->i_nlink = 2; | |
2304 | if (S_ISLNK(inode->i_mode)) | |
2305 | inode->i_size = 64; | |
2306 | if (p->iop) | |
2307 | inode->i_op = p->iop; | |
2308 | if (p->fop) | |
2309 | inode->i_fop = p->fop; | |
2310 | ei->op = p->op; | |
2311 | dentry->d_op = &proc_base_dentry_operations; | |
2312 | d_add(dentry, inode); | |
2313 | error = NULL; | |
2314 | out: | |
801199ce EB |
2315 | return error; |
2316 | out_iput: | |
2317 | iput(inode); | |
2318 | goto out; | |
2319 | } | |
2320 | ||
444ceed8 EB |
2321 | static struct dentry *proc_base_lookup(struct inode *dir, struct dentry *dentry) |
2322 | { | |
2323 | struct dentry *error; | |
2324 | struct task_struct *task = get_proc_task(dir); | |
c5141e6d | 2325 | const struct pid_entry *p, *last; |
444ceed8 EB |
2326 | |
2327 | error = ERR_PTR(-ENOENT); | |
2328 | ||
2329 | if (!task) | |
2330 | goto out_no_task; | |
2331 | ||
2332 | /* Lookup the directory entry */ | |
7bcd6b0e EB |
2333 | last = &proc_base_stuff[ARRAY_SIZE(proc_base_stuff) - 1]; |
2334 | for (p = proc_base_stuff; p <= last; p++) { | |
444ceed8 EB |
2335 | if (p->len != dentry->d_name.len) |
2336 | continue; | |
2337 | if (!memcmp(dentry->d_name.name, p->name, p->len)) | |
2338 | break; | |
2339 | } | |
7bcd6b0e | 2340 | if (p > last) |
444ceed8 EB |
2341 | goto out; |
2342 | ||
2343 | error = proc_base_instantiate(dir, dentry, task, p); | |
2344 | ||
2345 | out: | |
2346 | put_task_struct(task); | |
2347 | out_no_task: | |
2348 | return error; | |
2349 | } | |
2350 | ||
c5141e6d ED |
2351 | static int proc_base_fill_cache(struct file *filp, void *dirent, |
2352 | filldir_t filldir, struct task_struct *task, const struct pid_entry *p) | |
61a28784 EB |
2353 | { |
2354 | return proc_fill_cache(filp, dirent, filldir, p->name, p->len, | |
2355 | proc_base_instantiate, task, p); | |
2356 | } | |
2357 | ||
aba76fdb AM |
2358 | #ifdef CONFIG_TASK_IO_ACCOUNTING |
2359 | static int proc_pid_io_accounting(struct task_struct *task, char *buffer) | |
2360 | { | |
2361 | return sprintf(buffer, | |
4b98d11b | 2362 | #ifdef CONFIG_TASK_XACCT |
aba76fdb AM |
2363 | "rchar: %llu\n" |
2364 | "wchar: %llu\n" | |
2365 | "syscr: %llu\n" | |
2366 | "syscw: %llu\n" | |
4b98d11b | 2367 | #endif |
aba76fdb AM |
2368 | "read_bytes: %llu\n" |
2369 | "write_bytes: %llu\n" | |
2370 | "cancelled_write_bytes: %llu\n", | |
4b98d11b | 2371 | #ifdef CONFIG_TASK_XACCT |
aba76fdb AM |
2372 | (unsigned long long)task->rchar, |
2373 | (unsigned long long)task->wchar, | |
2374 | (unsigned long long)task->syscr, | |
2375 | (unsigned long long)task->syscw, | |
4b98d11b | 2376 | #endif |
aba76fdb AM |
2377 | (unsigned long long)task->ioac.read_bytes, |
2378 | (unsigned long long)task->ioac.write_bytes, | |
2379 | (unsigned long long)task->ioac.cancelled_write_bytes); | |
2380 | } | |
2381 | #endif | |
2382 | ||
28a6d671 EB |
2383 | /* |
2384 | * Thread groups | |
2385 | */ | |
00977a59 | 2386 | static const struct file_operations proc_task_operations; |
c5ef1c42 | 2387 | static const struct inode_operations proc_task_inode_operations; |
20cdc894 | 2388 | |
c5141e6d | 2389 | static const struct pid_entry tgid_base_stuff[] = { |
61a28784 EB |
2390 | DIR("task", S_IRUGO|S_IXUGO, task), |
2391 | DIR("fd", S_IRUSR|S_IXUSR, fd), | |
27932742 | 2392 | DIR("fdinfo", S_IRUSR|S_IXUSR, fdinfo), |
b2211a36 | 2393 | #ifdef CONFIG_NET |
4f42c288 | 2394 | DIR("net", S_IRUGO|S_IXUGO, net), |
b2211a36 | 2395 | #endif |
315e28c8 | 2396 | REG("environ", S_IRUSR, environ), |
61a28784 | 2397 | INF("auxv", S_IRUSR, pid_auxv), |
df5f8314 | 2398 | ONE("status", S_IRUGO, pid_status), |
d85f50d5 | 2399 | INF("limits", S_IRUSR, pid_limits), |
43ae34cb IM |
2400 | #ifdef CONFIG_SCHED_DEBUG |
2401 | REG("sched", S_IRUGO|S_IWUSR, pid_sched), | |
2402 | #endif | |
61a28784 | 2403 | INF("cmdline", S_IRUGO, pid_cmdline), |
ee992744 | 2404 | ONE("stat", S_IRUGO, tgid_stat), |
a56d3fc7 | 2405 | ONE("statm", S_IRUGO, pid_statm), |
61a28784 | 2406 | REG("maps", S_IRUGO, maps), |
28a6d671 | 2407 | #ifdef CONFIG_NUMA |
61a28784 | 2408 | REG("numa_maps", S_IRUGO, numa_maps), |
28a6d671 | 2409 | #endif |
61a28784 | 2410 | REG("mem", S_IRUSR|S_IWUSR, mem), |
61a28784 EB |
2411 | LNK("cwd", cwd), |
2412 | LNK("root", root), | |
2413 | LNK("exe", exe), | |
2414 | REG("mounts", S_IRUGO, mounts), | |
2d4d4864 | 2415 | REG("mountinfo", S_IRUGO, mountinfo), |
61a28784 | 2416 | REG("mountstats", S_IRUSR, mountstats), |
1e883281 | 2417 | #ifdef CONFIG_PROC_PAGE_MONITOR |
b813e931 | 2418 | REG("clear_refs", S_IWUSR, clear_refs), |
61a28784 | 2419 | REG("smaps", S_IRUGO, smaps), |
85863e47 | 2420 | REG("pagemap", S_IRUSR, pagemap), |
28a6d671 EB |
2421 | #endif |
2422 | #ifdef CONFIG_SECURITY | |
72d9dcfc | 2423 | DIR("attr", S_IRUGO|S_IXUGO, attr_dir), |
28a6d671 EB |
2424 | #endif |
2425 | #ifdef CONFIG_KALLSYMS | |
61a28784 | 2426 | INF("wchan", S_IRUGO, pid_wchan), |
28a6d671 EB |
2427 | #endif |
2428 | #ifdef CONFIG_SCHEDSTATS | |
61a28784 | 2429 | INF("schedstat", S_IRUGO, pid_schedstat), |
28a6d671 | 2430 | #endif |
9745512c AV |
2431 | #ifdef CONFIG_LATENCYTOP |
2432 | REG("latency", S_IRUGO, lstats), | |
2433 | #endif | |
8793d854 | 2434 | #ifdef CONFIG_PROC_PID_CPUSET |
61a28784 | 2435 | REG("cpuset", S_IRUGO, cpuset), |
a424316c PM |
2436 | #endif |
2437 | #ifdef CONFIG_CGROUPS | |
2438 | REG("cgroup", S_IRUGO, cgroup), | |
28a6d671 | 2439 | #endif |
61a28784 EB |
2440 | INF("oom_score", S_IRUGO, oom_score), |
2441 | REG("oom_adj", S_IRUGO|S_IWUSR, oom_adjust), | |
28a6d671 | 2442 | #ifdef CONFIG_AUDITSYSCALL |
61a28784 | 2443 | REG("loginuid", S_IWUSR|S_IRUGO, loginuid), |
1e0bd755 | 2444 | REG("sessionid", S_IRUSR, sessionid), |
28a6d671 | 2445 | #endif |
f4f154fd AM |
2446 | #ifdef CONFIG_FAULT_INJECTION |
2447 | REG("make-it-fail", S_IRUGO|S_IWUSR, fault_inject), | |
2448 | #endif | |
3cb4a0bb KH |
2449 | #if defined(USE_ELF_CORE_DUMP) && defined(CONFIG_ELF_CORE) |
2450 | REG("coredump_filter", S_IRUGO|S_IWUSR, coredump_filter), | |
2451 | #endif | |
aba76fdb AM |
2452 | #ifdef CONFIG_TASK_IO_ACCOUNTING |
2453 | INF("io", S_IRUGO, pid_io_accounting), | |
2454 | #endif | |
28a6d671 | 2455 | }; |
1da177e4 | 2456 | |
28a6d671 | 2457 | static int proc_tgid_base_readdir(struct file * filp, |
1da177e4 LT |
2458 | void * dirent, filldir_t filldir) |
2459 | { | |
2460 | return proc_pident_readdir(filp,dirent,filldir, | |
28a6d671 | 2461 | tgid_base_stuff,ARRAY_SIZE(tgid_base_stuff)); |
1da177e4 LT |
2462 | } |
2463 | ||
00977a59 | 2464 | static const struct file_operations proc_tgid_base_operations = { |
1da177e4 | 2465 | .read = generic_read_dir, |
28a6d671 | 2466 | .readdir = proc_tgid_base_readdir, |
1da177e4 LT |
2467 | }; |
2468 | ||
28a6d671 | 2469 | static struct dentry *proc_tgid_base_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd){ |
7bcd6b0e EB |
2470 | return proc_pident_lookup(dir, dentry, |
2471 | tgid_base_stuff, ARRAY_SIZE(tgid_base_stuff)); | |
1da177e4 LT |
2472 | } |
2473 | ||
c5ef1c42 | 2474 | static const struct inode_operations proc_tgid_base_inode_operations = { |
28a6d671 | 2475 | .lookup = proc_tgid_base_lookup, |
99f89551 | 2476 | .getattr = pid_getattr, |
6d76fa58 | 2477 | .setattr = proc_setattr, |
1da177e4 | 2478 | }; |
1da177e4 | 2479 | |
60347f67 | 2480 | static void proc_flush_task_mnt(struct vfsmount *mnt, pid_t pid, pid_t tgid) |
1da177e4 | 2481 | { |
48e6484d | 2482 | struct dentry *dentry, *leader, *dir; |
8578cea7 | 2483 | char buf[PROC_NUMBUF]; |
48e6484d EB |
2484 | struct qstr name; |
2485 | ||
2486 | name.name = buf; | |
60347f67 PE |
2487 | name.len = snprintf(buf, sizeof(buf), "%d", pid); |
2488 | dentry = d_hash_and_lookup(mnt->mnt_root, &name); | |
48e6484d | 2489 | if (dentry) { |
7766755a AA |
2490 | if (!(current->flags & PF_EXITING)) |
2491 | shrink_dcache_parent(dentry); | |
48e6484d EB |
2492 | d_drop(dentry); |
2493 | dput(dentry); | |
2494 | } | |
1da177e4 | 2495 | |
60347f67 | 2496 | if (tgid == 0) |
48e6484d | 2497 | goto out; |
1da177e4 | 2498 | |
48e6484d | 2499 | name.name = buf; |
60347f67 PE |
2500 | name.len = snprintf(buf, sizeof(buf), "%d", tgid); |
2501 | leader = d_hash_and_lookup(mnt->mnt_root, &name); | |
48e6484d EB |
2502 | if (!leader) |
2503 | goto out; | |
1da177e4 | 2504 | |
48e6484d EB |
2505 | name.name = "task"; |
2506 | name.len = strlen(name.name); | |
2507 | dir = d_hash_and_lookup(leader, &name); | |
2508 | if (!dir) | |
2509 | goto out_put_leader; | |
2510 | ||
2511 | name.name = buf; | |
60347f67 | 2512 | name.len = snprintf(buf, sizeof(buf), "%d", pid); |
48e6484d EB |
2513 | dentry = d_hash_and_lookup(dir, &name); |
2514 | if (dentry) { | |
2515 | shrink_dcache_parent(dentry); | |
2516 | d_drop(dentry); | |
2517 | dput(dentry); | |
1da177e4 | 2518 | } |
48e6484d EB |
2519 | |
2520 | dput(dir); | |
2521 | out_put_leader: | |
2522 | dput(leader); | |
2523 | out: | |
2524 | return; | |
1da177e4 LT |
2525 | } |
2526 | ||
0895e91d RD |
2527 | /** |
2528 | * proc_flush_task - Remove dcache entries for @task from the /proc dcache. | |
2529 | * @task: task that should be flushed. | |
2530 | * | |
2531 | * When flushing dentries from proc, one needs to flush them from global | |
60347f67 | 2532 | * proc (proc_mnt) and from all the namespaces' procs this task was seen |
0895e91d RD |
2533 | * in. This call is supposed to do all of this job. |
2534 | * | |
2535 | * Looks in the dcache for | |
2536 | * /proc/@pid | |
2537 | * /proc/@tgid/task/@pid | |
2538 | * if either directory is present flushes it and all of it'ts children | |
2539 | * from the dcache. | |
2540 | * | |
2541 | * It is safe and reasonable to cache /proc entries for a task until | |
2542 | * that task exits. After that they just clog up the dcache with | |
2543 | * useless entries, possibly causing useful dcache entries to be | |
2544 | * flushed instead. This routine is proved to flush those useless | |
2545 | * dcache entries at process exit time. | |
2546 | * | |
2547 | * NOTE: This routine is just an optimization so it does not guarantee | |
2548 | * that no dcache entries will exist at process exit time it | |
2549 | * just makes it very unlikely that any will persist. | |
60347f67 PE |
2550 | */ |
2551 | ||
2552 | void proc_flush_task(struct task_struct *task) | |
2553 | { | |
9fcc2d15 EB |
2554 | int i; |
2555 | struct pid *pid, *tgid = NULL; | |
130f77ec PE |
2556 | struct upid *upid; |
2557 | ||
130f77ec | 2558 | pid = task_pid(task); |
9fcc2d15 EB |
2559 | if (thread_group_leader(task)) |
2560 | tgid = task_tgid(task); | |
130f77ec | 2561 | |
9fcc2d15 | 2562 | for (i = 0; i <= pid->level; i++) { |
130f77ec PE |
2563 | upid = &pid->numbers[i]; |
2564 | proc_flush_task_mnt(upid->ns->proc_mnt, upid->nr, | |
9fcc2d15 | 2565 | tgid ? tgid->numbers[i].nr : 0); |
130f77ec | 2566 | } |
6f4e6433 PE |
2567 | |
2568 | upid = &pid->numbers[pid->level]; | |
2569 | if (upid->nr == 1) | |
2570 | pid_ns_release_proc(upid->ns); | |
60347f67 PE |
2571 | } |
2572 | ||
9711ef99 AB |
2573 | static struct dentry *proc_pid_instantiate(struct inode *dir, |
2574 | struct dentry * dentry, | |
c5141e6d | 2575 | struct task_struct *task, const void *ptr) |
444ceed8 EB |
2576 | { |
2577 | struct dentry *error = ERR_PTR(-ENOENT); | |
2578 | struct inode *inode; | |
2579 | ||
61a28784 | 2580 | inode = proc_pid_make_inode(dir->i_sb, task); |
444ceed8 EB |
2581 | if (!inode) |
2582 | goto out; | |
2583 | ||
2584 | inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO; | |
2585 | inode->i_op = &proc_tgid_base_inode_operations; | |
2586 | inode->i_fop = &proc_tgid_base_operations; | |
2587 | inode->i_flags|=S_IMMUTABLE; | |
27932742 | 2588 | inode->i_nlink = 5; |
444ceed8 EB |
2589 | #ifdef CONFIG_SECURITY |
2590 | inode->i_nlink += 1; | |
2591 | #endif | |
2592 | ||
2593 | dentry->d_op = &pid_dentry_operations; | |
2594 | ||
2595 | d_add(dentry, inode); | |
2596 | /* Close the race of the process dying before we return the dentry */ | |
2597 | if (pid_revalidate(dentry, NULL)) | |
2598 | error = NULL; | |
2599 | out: | |
2600 | return error; | |
2601 | } | |
2602 | ||
1da177e4 LT |
2603 | struct dentry *proc_pid_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd) |
2604 | { | |
cd6a3ce9 | 2605 | struct dentry *result = ERR_PTR(-ENOENT); |
1da177e4 | 2606 | struct task_struct *task; |
1da177e4 | 2607 | unsigned tgid; |
b488893a | 2608 | struct pid_namespace *ns; |
1da177e4 | 2609 | |
801199ce EB |
2610 | result = proc_base_lookup(dir, dentry); |
2611 | if (!IS_ERR(result) || PTR_ERR(result) != -ENOENT) | |
2612 | goto out; | |
2613 | ||
1da177e4 LT |
2614 | tgid = name_to_int(dentry); |
2615 | if (tgid == ~0U) | |
2616 | goto out; | |
2617 | ||
b488893a | 2618 | ns = dentry->d_sb->s_fs_info; |
de758734 | 2619 | rcu_read_lock(); |
b488893a | 2620 | task = find_task_by_pid_ns(tgid, ns); |
1da177e4 LT |
2621 | if (task) |
2622 | get_task_struct(task); | |
de758734 | 2623 | rcu_read_unlock(); |
1da177e4 LT |
2624 | if (!task) |
2625 | goto out; | |
2626 | ||
444ceed8 | 2627 | result = proc_pid_instantiate(dir, dentry, task, NULL); |
1da177e4 | 2628 | put_task_struct(task); |
1da177e4 | 2629 | out: |
cd6a3ce9 | 2630 | return result; |
1da177e4 LT |
2631 | } |
2632 | ||
1da177e4 | 2633 | /* |
0804ef4b | 2634 | * Find the first task with tgid >= tgid |
0bc58a91 | 2635 | * |
1da177e4 | 2636 | */ |
19fd4bb2 EB |
2637 | struct tgid_iter { |
2638 | unsigned int tgid; | |
0804ef4b | 2639 | struct task_struct *task; |
19fd4bb2 EB |
2640 | }; |
2641 | static struct tgid_iter next_tgid(struct pid_namespace *ns, struct tgid_iter iter) | |
2642 | { | |
0804ef4b | 2643 | struct pid *pid; |
1da177e4 | 2644 | |
19fd4bb2 EB |
2645 | if (iter.task) |
2646 | put_task_struct(iter.task); | |
454cc105 | 2647 | rcu_read_lock(); |
0804ef4b | 2648 | retry: |
19fd4bb2 EB |
2649 | iter.task = NULL; |
2650 | pid = find_ge_pid(iter.tgid, ns); | |
0804ef4b | 2651 | if (pid) { |
19fd4bb2 EB |
2652 | iter.tgid = pid_nr_ns(pid, ns); |
2653 | iter.task = pid_task(pid, PIDTYPE_PID); | |
0804ef4b EB |
2654 | /* What we to know is if the pid we have find is the |
2655 | * pid of a thread_group_leader. Testing for task | |
2656 | * being a thread_group_leader is the obvious thing | |
2657 | * todo but there is a window when it fails, due to | |
2658 | * the pid transfer logic in de_thread. | |
2659 | * | |
2660 | * So we perform the straight forward test of seeing | |
2661 | * if the pid we have found is the pid of a thread | |
2662 | * group leader, and don't worry if the task we have | |
2663 | * found doesn't happen to be a thread group leader. | |
2664 | * As we don't care in the case of readdir. | |
2665 | */ | |
19fd4bb2 EB |
2666 | if (!iter.task || !has_group_leader_pid(iter.task)) { |
2667 | iter.tgid += 1; | |
0804ef4b | 2668 | goto retry; |
19fd4bb2 EB |
2669 | } |
2670 | get_task_struct(iter.task); | |
0bc58a91 | 2671 | } |
454cc105 | 2672 | rcu_read_unlock(); |
19fd4bb2 | 2673 | return iter; |
1da177e4 LT |
2674 | } |
2675 | ||
7bcd6b0e | 2676 | #define TGID_OFFSET (FIRST_PROCESS_ENTRY + ARRAY_SIZE(proc_base_stuff)) |
0804ef4b | 2677 | |
61a28784 | 2678 | static int proc_pid_fill_cache(struct file *filp, void *dirent, filldir_t filldir, |
19fd4bb2 | 2679 | struct tgid_iter iter) |
61a28784 EB |
2680 | { |
2681 | char name[PROC_NUMBUF]; | |
19fd4bb2 | 2682 | int len = snprintf(name, sizeof(name), "%d", iter.tgid); |
61a28784 | 2683 | return proc_fill_cache(filp, dirent, filldir, name, len, |
19fd4bb2 | 2684 | proc_pid_instantiate, iter.task, NULL); |
61a28784 EB |
2685 | } |
2686 | ||
1da177e4 LT |
2687 | /* for the /proc/ directory itself, after non-process stuff has been done */ |
2688 | int proc_pid_readdir(struct file * filp, void * dirent, filldir_t filldir) | |
2689 | { | |
1da177e4 | 2690 | unsigned int nr = filp->f_pos - FIRST_PROCESS_ENTRY; |
2fddfeef | 2691 | struct task_struct *reaper = get_proc_task(filp->f_path.dentry->d_inode); |
19fd4bb2 | 2692 | struct tgid_iter iter; |
b488893a | 2693 | struct pid_namespace *ns; |
1da177e4 | 2694 | |
61a28784 EB |
2695 | if (!reaper) |
2696 | goto out_no_task; | |
2697 | ||
7bcd6b0e | 2698 | for (; nr < ARRAY_SIZE(proc_base_stuff); filp->f_pos++, nr++) { |
c5141e6d | 2699 | const struct pid_entry *p = &proc_base_stuff[nr]; |
61a28784 | 2700 | if (proc_base_fill_cache(filp, dirent, filldir, reaper, p) < 0) |
801199ce | 2701 | goto out; |
1da177e4 LT |
2702 | } |
2703 | ||
b488893a | 2704 | ns = filp->f_dentry->d_sb->s_fs_info; |
19fd4bb2 EB |
2705 | iter.task = NULL; |
2706 | iter.tgid = filp->f_pos - TGID_OFFSET; | |
2707 | for (iter = next_tgid(ns, iter); | |
2708 | iter.task; | |
2709 | iter.tgid += 1, iter = next_tgid(ns, iter)) { | |
2710 | filp->f_pos = iter.tgid + TGID_OFFSET; | |
2711 | if (proc_pid_fill_cache(filp, dirent, filldir, iter) < 0) { | |
2712 | put_task_struct(iter.task); | |
0804ef4b | 2713 | goto out; |
1da177e4 | 2714 | } |
0bc58a91 | 2715 | } |
0804ef4b EB |
2716 | filp->f_pos = PID_MAX_LIMIT + TGID_OFFSET; |
2717 | out: | |
61a28784 EB |
2718 | put_task_struct(reaper); |
2719 | out_no_task: | |
0bc58a91 EB |
2720 | return 0; |
2721 | } | |
1da177e4 | 2722 | |
28a6d671 EB |
2723 | /* |
2724 | * Tasks | |
2725 | */ | |
c5141e6d | 2726 | static const struct pid_entry tid_base_stuff[] = { |
61a28784 | 2727 | DIR("fd", S_IRUSR|S_IXUSR, fd), |
27932742 | 2728 | DIR("fdinfo", S_IRUSR|S_IXUSR, fdinfo), |
315e28c8 | 2729 | REG("environ", S_IRUSR, environ), |
61a28784 | 2730 | INF("auxv", S_IRUSR, pid_auxv), |
df5f8314 | 2731 | ONE("status", S_IRUGO, pid_status), |
d85f50d5 | 2732 | INF("limits", S_IRUSR, pid_limits), |
43ae34cb IM |
2733 | #ifdef CONFIG_SCHED_DEBUG |
2734 | REG("sched", S_IRUGO|S_IWUSR, pid_sched), | |
2735 | #endif | |
61a28784 | 2736 | INF("cmdline", S_IRUGO, pid_cmdline), |
ee992744 | 2737 | ONE("stat", S_IRUGO, tid_stat), |
a56d3fc7 | 2738 | ONE("statm", S_IRUGO, pid_statm), |
61a28784 | 2739 | REG("maps", S_IRUGO, maps), |
28a6d671 | 2740 | #ifdef CONFIG_NUMA |
61a28784 | 2741 | REG("numa_maps", S_IRUGO, numa_maps), |
28a6d671 | 2742 | #endif |
61a28784 | 2743 | REG("mem", S_IRUSR|S_IWUSR, mem), |
61a28784 EB |
2744 | LNK("cwd", cwd), |
2745 | LNK("root", root), | |
2746 | LNK("exe", exe), | |
2747 | REG("mounts", S_IRUGO, mounts), | |
2d4d4864 | 2748 | REG("mountinfo", S_IRUGO, mountinfo), |
1e883281 | 2749 | #ifdef CONFIG_PROC_PAGE_MONITOR |
b813e931 | 2750 | REG("clear_refs", S_IWUSR, clear_refs), |
61a28784 | 2751 | REG("smaps", S_IRUGO, smaps), |
85863e47 | 2752 | REG("pagemap", S_IRUSR, pagemap), |
28a6d671 EB |
2753 | #endif |
2754 | #ifdef CONFIG_SECURITY | |
72d9dcfc | 2755 | DIR("attr", S_IRUGO|S_IXUGO, attr_dir), |
28a6d671 EB |
2756 | #endif |
2757 | #ifdef CONFIG_KALLSYMS | |
61a28784 | 2758 | INF("wchan", S_IRUGO, pid_wchan), |
28a6d671 EB |
2759 | #endif |
2760 | #ifdef CONFIG_SCHEDSTATS | |
61a28784 | 2761 | INF("schedstat", S_IRUGO, pid_schedstat), |
28a6d671 | 2762 | #endif |
9745512c AV |
2763 | #ifdef CONFIG_LATENCYTOP |
2764 | REG("latency", S_IRUGO, lstats), | |
2765 | #endif | |
8793d854 | 2766 | #ifdef CONFIG_PROC_PID_CPUSET |
61a28784 | 2767 | REG("cpuset", S_IRUGO, cpuset), |
a424316c PM |
2768 | #endif |
2769 | #ifdef CONFIG_CGROUPS | |
2770 | REG("cgroup", S_IRUGO, cgroup), | |
28a6d671 | 2771 | #endif |
61a28784 EB |
2772 | INF("oom_score", S_IRUGO, oom_score), |
2773 | REG("oom_adj", S_IRUGO|S_IWUSR, oom_adjust), | |
28a6d671 | 2774 | #ifdef CONFIG_AUDITSYSCALL |
61a28784 | 2775 | REG("loginuid", S_IWUSR|S_IRUGO, loginuid), |
1e0bd755 | 2776 | REG("sessionid", S_IRUSR, sessionid), |
28a6d671 | 2777 | #endif |
f4f154fd AM |
2778 | #ifdef CONFIG_FAULT_INJECTION |
2779 | REG("make-it-fail", S_IRUGO|S_IWUSR, fault_inject), | |
2780 | #endif | |
28a6d671 EB |
2781 | }; |
2782 | ||
2783 | static int proc_tid_base_readdir(struct file * filp, | |
2784 | void * dirent, filldir_t filldir) | |
2785 | { | |
2786 | return proc_pident_readdir(filp,dirent,filldir, | |
2787 | tid_base_stuff,ARRAY_SIZE(tid_base_stuff)); | |
2788 | } | |
2789 | ||
2790 | static struct dentry *proc_tid_base_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd){ | |
7bcd6b0e EB |
2791 | return proc_pident_lookup(dir, dentry, |
2792 | tid_base_stuff, ARRAY_SIZE(tid_base_stuff)); | |
28a6d671 EB |
2793 | } |
2794 | ||
00977a59 | 2795 | static const struct file_operations proc_tid_base_operations = { |
28a6d671 EB |
2796 | .read = generic_read_dir, |
2797 | .readdir = proc_tid_base_readdir, | |
2798 | }; | |
2799 | ||
c5ef1c42 | 2800 | static const struct inode_operations proc_tid_base_inode_operations = { |
28a6d671 EB |
2801 | .lookup = proc_tid_base_lookup, |
2802 | .getattr = pid_getattr, | |
2803 | .setattr = proc_setattr, | |
2804 | }; | |
2805 | ||
444ceed8 | 2806 | static struct dentry *proc_task_instantiate(struct inode *dir, |
c5141e6d | 2807 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
444ceed8 EB |
2808 | { |
2809 | struct dentry *error = ERR_PTR(-ENOENT); | |
2810 | struct inode *inode; | |
61a28784 | 2811 | inode = proc_pid_make_inode(dir->i_sb, task); |
444ceed8 EB |
2812 | |
2813 | if (!inode) | |
2814 | goto out; | |
2815 | inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO; | |
2816 | inode->i_op = &proc_tid_base_inode_operations; | |
2817 | inode->i_fop = &proc_tid_base_operations; | |
2818 | inode->i_flags|=S_IMMUTABLE; | |
27932742 | 2819 | inode->i_nlink = 4; |
444ceed8 EB |
2820 | #ifdef CONFIG_SECURITY |
2821 | inode->i_nlink += 1; | |
2822 | #endif | |
2823 | ||
2824 | dentry->d_op = &pid_dentry_operations; | |
2825 | ||
2826 | d_add(dentry, inode); | |
2827 | /* Close the race of the process dying before we return the dentry */ | |
2828 | if (pid_revalidate(dentry, NULL)) | |
2829 | error = NULL; | |
2830 | out: | |
2831 | return error; | |
2832 | } | |
2833 | ||
28a6d671 EB |
2834 | static struct dentry *proc_task_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd) |
2835 | { | |
2836 | struct dentry *result = ERR_PTR(-ENOENT); | |
2837 | struct task_struct *task; | |
2838 | struct task_struct *leader = get_proc_task(dir); | |
28a6d671 | 2839 | unsigned tid; |
b488893a | 2840 | struct pid_namespace *ns; |
28a6d671 EB |
2841 | |
2842 | if (!leader) | |
2843 | goto out_no_task; | |
2844 | ||
2845 | tid = name_to_int(dentry); | |
2846 | if (tid == ~0U) | |
2847 | goto out; | |
2848 | ||
b488893a | 2849 | ns = dentry->d_sb->s_fs_info; |
28a6d671 | 2850 | rcu_read_lock(); |
b488893a | 2851 | task = find_task_by_pid_ns(tid, ns); |
28a6d671 EB |
2852 | if (task) |
2853 | get_task_struct(task); | |
2854 | rcu_read_unlock(); | |
2855 | if (!task) | |
2856 | goto out; | |
bac0abd6 | 2857 | if (!same_thread_group(leader, task)) |
28a6d671 EB |
2858 | goto out_drop_task; |
2859 | ||
444ceed8 | 2860 | result = proc_task_instantiate(dir, dentry, task, NULL); |
28a6d671 EB |
2861 | out_drop_task: |
2862 | put_task_struct(task); | |
2863 | out: | |
2864 | put_task_struct(leader); | |
2865 | out_no_task: | |
2866 | return result; | |
2867 | } | |
2868 | ||
0bc58a91 EB |
2869 | /* |
2870 | * Find the first tid of a thread group to return to user space. | |
2871 | * | |
2872 | * Usually this is just the thread group leader, but if the users | |
2873 | * buffer was too small or there was a seek into the middle of the | |
2874 | * directory we have more work todo. | |
2875 | * | |
2876 | * In the case of a short read we start with find_task_by_pid. | |
2877 | * | |
2878 | * In the case of a seek we start with the leader and walk nr | |
2879 | * threads past it. | |
2880 | */ | |
cc288738 | 2881 | static struct task_struct *first_tid(struct task_struct *leader, |
b488893a | 2882 | int tid, int nr, struct pid_namespace *ns) |
0bc58a91 | 2883 | { |
a872ff0c | 2884 | struct task_struct *pos; |
1da177e4 | 2885 | |
cc288738 | 2886 | rcu_read_lock(); |
0bc58a91 EB |
2887 | /* Attempt to start with the pid of a thread */ |
2888 | if (tid && (nr > 0)) { | |
b488893a | 2889 | pos = find_task_by_pid_ns(tid, ns); |
a872ff0c ON |
2890 | if (pos && (pos->group_leader == leader)) |
2891 | goto found; | |
0bc58a91 | 2892 | } |
1da177e4 | 2893 | |
0bc58a91 | 2894 | /* If nr exceeds the number of threads there is nothing todo */ |
a872ff0c ON |
2895 | pos = NULL; |
2896 | if (nr && nr >= get_nr_threads(leader)) | |
2897 | goto out; | |
1da177e4 | 2898 | |
a872ff0c ON |
2899 | /* If we haven't found our starting place yet start |
2900 | * with the leader and walk nr threads forward. | |
0bc58a91 | 2901 | */ |
a872ff0c ON |
2902 | for (pos = leader; nr > 0; --nr) { |
2903 | pos = next_thread(pos); | |
2904 | if (pos == leader) { | |
2905 | pos = NULL; | |
2906 | goto out; | |
2907 | } | |
1da177e4 | 2908 | } |
a872ff0c ON |
2909 | found: |
2910 | get_task_struct(pos); | |
2911 | out: | |
cc288738 | 2912 | rcu_read_unlock(); |
0bc58a91 EB |
2913 | return pos; |
2914 | } | |
2915 | ||
2916 | /* | |
2917 | * Find the next thread in the thread list. | |
2918 | * Return NULL if there is an error or no next thread. | |
2919 | * | |
2920 | * The reference to the input task_struct is released. | |
2921 | */ | |
2922 | static struct task_struct *next_tid(struct task_struct *start) | |
2923 | { | |
c1df7fb8 | 2924 | struct task_struct *pos = NULL; |
cc288738 | 2925 | rcu_read_lock(); |
c1df7fb8 | 2926 | if (pid_alive(start)) { |
0bc58a91 | 2927 | pos = next_thread(start); |
c1df7fb8 ON |
2928 | if (thread_group_leader(pos)) |
2929 | pos = NULL; | |
2930 | else | |
2931 | get_task_struct(pos); | |
2932 | } | |
cc288738 | 2933 | rcu_read_unlock(); |
0bc58a91 EB |
2934 | put_task_struct(start); |
2935 | return pos; | |
1da177e4 LT |
2936 | } |
2937 | ||
61a28784 EB |
2938 | static int proc_task_fill_cache(struct file *filp, void *dirent, filldir_t filldir, |
2939 | struct task_struct *task, int tid) | |
2940 | { | |
2941 | char name[PROC_NUMBUF]; | |
2942 | int len = snprintf(name, sizeof(name), "%d", tid); | |
2943 | return proc_fill_cache(filp, dirent, filldir, name, len, | |
2944 | proc_task_instantiate, task, NULL); | |
2945 | } | |
2946 | ||
1da177e4 LT |
2947 | /* for the /proc/TGID/task/ directories */ |
2948 | static int proc_task_readdir(struct file * filp, void * dirent, filldir_t filldir) | |
2949 | { | |
2fddfeef | 2950 | struct dentry *dentry = filp->f_path.dentry; |
1da177e4 | 2951 | struct inode *inode = dentry->d_inode; |
7d895244 | 2952 | struct task_struct *leader = NULL; |
0bc58a91 | 2953 | struct task_struct *task; |
1da177e4 LT |
2954 | int retval = -ENOENT; |
2955 | ino_t ino; | |
0bc58a91 | 2956 | int tid; |
1da177e4 | 2957 | unsigned long pos = filp->f_pos; /* avoiding "long long" filp->f_pos */ |
b488893a | 2958 | struct pid_namespace *ns; |
1da177e4 | 2959 | |
7d895244 GC |
2960 | task = get_proc_task(inode); |
2961 | if (!task) | |
2962 | goto out_no_task; | |
2963 | rcu_read_lock(); | |
2964 | if (pid_alive(task)) { | |
2965 | leader = task->group_leader; | |
2966 | get_task_struct(leader); | |
2967 | } | |
2968 | rcu_read_unlock(); | |
2969 | put_task_struct(task); | |
99f89551 EB |
2970 | if (!leader) |
2971 | goto out_no_task; | |
1da177e4 LT |
2972 | retval = 0; |
2973 | ||
2974 | switch (pos) { | |
2975 | case 0: | |
2976 | ino = inode->i_ino; | |
2977 | if (filldir(dirent, ".", 1, pos, ino, DT_DIR) < 0) | |
2978 | goto out; | |
2979 | pos++; | |
2980 | /* fall through */ | |
2981 | case 1: | |
2982 | ino = parent_ino(dentry); | |
2983 | if (filldir(dirent, "..", 2, pos, ino, DT_DIR) < 0) | |
2984 | goto out; | |
2985 | pos++; | |
2986 | /* fall through */ | |
2987 | } | |
2988 | ||
0bc58a91 EB |
2989 | /* f_version caches the tgid value that the last readdir call couldn't |
2990 | * return. lseek aka telldir automagically resets f_version to 0. | |
2991 | */ | |
b488893a | 2992 | ns = filp->f_dentry->d_sb->s_fs_info; |
2b47c361 | 2993 | tid = (int)filp->f_version; |
0bc58a91 | 2994 | filp->f_version = 0; |
b488893a | 2995 | for (task = first_tid(leader, tid, pos - 2, ns); |
0bc58a91 EB |
2996 | task; |
2997 | task = next_tid(task), pos++) { | |
b488893a | 2998 | tid = task_pid_nr_ns(task, ns); |
61a28784 | 2999 | if (proc_task_fill_cache(filp, dirent, filldir, task, tid) < 0) { |
0bc58a91 EB |
3000 | /* returning this tgid failed, save it as the first |
3001 | * pid for the next readir call */ | |
2b47c361 | 3002 | filp->f_version = (u64)tid; |
0bc58a91 | 3003 | put_task_struct(task); |
1da177e4 | 3004 | break; |
0bc58a91 | 3005 | } |
1da177e4 LT |
3006 | } |
3007 | out: | |
3008 | filp->f_pos = pos; | |
99f89551 EB |
3009 | put_task_struct(leader); |
3010 | out_no_task: | |
1da177e4 LT |
3011 | return retval; |
3012 | } | |
6e66b52b EB |
3013 | |
3014 | static int proc_task_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) | |
3015 | { | |
3016 | struct inode *inode = dentry->d_inode; | |
99f89551 | 3017 | struct task_struct *p = get_proc_task(inode); |
6e66b52b EB |
3018 | generic_fillattr(inode, stat); |
3019 | ||
99f89551 EB |
3020 | if (p) { |
3021 | rcu_read_lock(); | |
3022 | stat->nlink += get_nr_threads(p); | |
3023 | rcu_read_unlock(); | |
3024 | put_task_struct(p); | |
6e66b52b EB |
3025 | } |
3026 | ||
3027 | return 0; | |
3028 | } | |
28a6d671 | 3029 | |
c5ef1c42 | 3030 | static const struct inode_operations proc_task_inode_operations = { |
28a6d671 EB |
3031 | .lookup = proc_task_lookup, |
3032 | .getattr = proc_task_getattr, | |
3033 | .setattr = proc_setattr, | |
3034 | }; | |
3035 | ||
00977a59 | 3036 | static const struct file_operations proc_task_operations = { |
28a6d671 EB |
3037 | .read = generic_read_dir, |
3038 | .readdir = proc_task_readdir, | |
3039 | }; |