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