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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/fs/proc/base.c | |
3 | * | |
4 | * Copyright (C) 1991, 1992 Linus Torvalds | |
5 | * | |
6 | * proc base directory handling functions | |
7 | * | |
8 | * 1999, Al Viro. Rewritten. Now it covers the whole per-process part. | |
9 | * Instead of using magical inumbers to determine the kind of object | |
10 | * we allocate and fill in-core inodes upon lookup. They don't even | |
11 | * go into icache. We cache the reference to task_struct upon lookup too. | |
12 | * Eventually it should become a filesystem in its own. We don't use the | |
13 | * rest of procfs anymore. | |
e070ad49 ML |
14 | * |
15 | * | |
16 | * Changelog: | |
17 | * 17-Jan-2005 | |
18 | * Allan Bezerra | |
19 | * Bruna Moreira <bruna.moreira@indt.org.br> | |
20 | * Edjard Mota <edjard.mota@indt.org.br> | |
21 | * Ilias Biris <ilias.biris@indt.org.br> | |
22 | * Mauricio Lin <mauricio.lin@indt.org.br> | |
23 | * | |
24 | * Embedded Linux Lab - 10LE Instituto Nokia de Tecnologia - INdT | |
25 | * | |
26 | * A new process specific entry (smaps) included in /proc. It shows the | |
27 | * size of rss for each memory area. The maps entry lacks information | |
28 | * about physical memory size (rss) for each mapped file, i.e., | |
29 | * rss information for executables and library files. | |
30 | * This additional information is useful for any tools that need to know | |
31 | * about physical memory consumption for a process specific library. | |
32 | * | |
33 | * Changelog: | |
34 | * 21-Feb-2005 | |
35 | * Embedded Linux Lab - 10LE Instituto Nokia de Tecnologia - INdT | |
36 | * Pud inclusion in the page table walking. | |
37 | * | |
38 | * ChangeLog: | |
39 | * 10-Mar-2005 | |
40 | * 10LE Instituto Nokia de Tecnologia - INdT: | |
41 | * A better way to walks through the page table as suggested by Hugh Dickins. | |
42 | * | |
43 | * Simo Piiroinen <simo.piiroinen@nokia.com>: | |
44 | * Smaps information related to shared, private, clean and dirty pages. | |
45 | * | |
46 | * Paul Mundt <paul.mundt@nokia.com>: | |
47 | * Overall revision about smaps. | |
1da177e4 LT |
48 | */ |
49 | ||
50 | #include <asm/uaccess.h> | |
51 | ||
1da177e4 LT |
52 | #include <linux/errno.h> |
53 | #include <linux/time.h> | |
54 | #include <linux/proc_fs.h> | |
55 | #include <linux/stat.h> | |
5995477a | 56 | #include <linux/task_io_accounting_ops.h> |
1da177e4 | 57 | #include <linux/init.h> |
16f7e0fe | 58 | #include <linux/capability.h> |
1da177e4 | 59 | #include <linux/file.h> |
9f3acc31 | 60 | #include <linux/fdtable.h> |
1da177e4 LT |
61 | #include <linux/string.h> |
62 | #include <linux/seq_file.h> | |
63 | #include <linux/namei.h> | |
6b3286ed | 64 | #include <linux/mnt_namespace.h> |
1da177e4 | 65 | #include <linux/mm.h> |
b835996f | 66 | #include <linux/rcupdate.h> |
1da177e4 | 67 | #include <linux/kallsyms.h> |
d85f50d5 | 68 | #include <linux/resource.h> |
5096add8 | 69 | #include <linux/module.h> |
1da177e4 LT |
70 | #include <linux/mount.h> |
71 | #include <linux/security.h> | |
72 | #include <linux/ptrace.h> | |
0d094efe | 73 | #include <linux/tracehook.h> |
a424316c | 74 | #include <linux/cgroup.h> |
1da177e4 LT |
75 | #include <linux/cpuset.h> |
76 | #include <linux/audit.h> | |
5addc5dd | 77 | #include <linux/poll.h> |
1651e14e | 78 | #include <linux/nsproxy.h> |
8ac773b4 | 79 | #include <linux/oom.h> |
3cb4a0bb | 80 | #include <linux/elf.h> |
60347f67 | 81 | #include <linux/pid_namespace.h> |
1da177e4 LT |
82 | #include "internal.h" |
83 | ||
0f2fe20f EB |
84 | /* NOTE: |
85 | * Implementing inode permission operations in /proc is almost | |
86 | * certainly an error. Permission checks need to happen during | |
87 | * each system call not at open time. The reason is that most of | |
88 | * what we wish to check for permissions in /proc varies at runtime. | |
89 | * | |
90 | * The classic example of a problem is opening file descriptors | |
91 | * in /proc for a task before it execs a suid executable. | |
92 | */ | |
93 | ||
1da177e4 | 94 | struct pid_entry { |
1da177e4 | 95 | char *name; |
c5141e6d | 96 | int len; |
1da177e4 | 97 | mode_t mode; |
c5ef1c42 | 98 | const struct inode_operations *iop; |
00977a59 | 99 | const struct file_operations *fop; |
20cdc894 | 100 | union proc_op op; |
1da177e4 LT |
101 | }; |
102 | ||
61a28784 | 103 | #define NOD(NAME, MODE, IOP, FOP, OP) { \ |
20cdc894 | 104 | .name = (NAME), \ |
c5141e6d | 105 | .len = sizeof(NAME) - 1, \ |
20cdc894 EB |
106 | .mode = MODE, \ |
107 | .iop = IOP, \ | |
108 | .fop = FOP, \ | |
109 | .op = OP, \ | |
110 | } | |
111 | ||
61a28784 EB |
112 | #define DIR(NAME, MODE, OTYPE) \ |
113 | NOD(NAME, (S_IFDIR|(MODE)), \ | |
20cdc894 EB |
114 | &proc_##OTYPE##_inode_operations, &proc_##OTYPE##_operations, \ |
115 | {} ) | |
61a28784 EB |
116 | #define LNK(NAME, OTYPE) \ |
117 | NOD(NAME, (S_IFLNK|S_IRWXUGO), \ | |
20cdc894 EB |
118 | &proc_pid_link_inode_operations, NULL, \ |
119 | { .proc_get_link = &proc_##OTYPE##_link } ) | |
61a28784 EB |
120 | #define REG(NAME, MODE, OTYPE) \ |
121 | NOD(NAME, (S_IFREG|(MODE)), NULL, \ | |
20cdc894 | 122 | &proc_##OTYPE##_operations, {}) |
61a28784 EB |
123 | #define INF(NAME, MODE, OTYPE) \ |
124 | NOD(NAME, (S_IFREG|(MODE)), \ | |
20cdc894 EB |
125 | NULL, &proc_info_file_operations, \ |
126 | { .proc_read = &proc_##OTYPE } ) | |
be614086 EB |
127 | #define ONE(NAME, MODE, OTYPE) \ |
128 | NOD(NAME, (S_IFREG|(MODE)), \ | |
129 | NULL, &proc_single_file_operations, \ | |
130 | { .proc_show = &proc_##OTYPE } ) | |
1da177e4 | 131 | |
aed54175 VN |
132 | /* |
133 | * Count the number of hardlinks for the pid_entry table, excluding the . | |
134 | * and .. links. | |
135 | */ | |
136 | static unsigned int pid_entry_count_dirs(const struct pid_entry *entries, | |
137 | unsigned int n) | |
138 | { | |
139 | unsigned int i; | |
140 | unsigned int count; | |
141 | ||
142 | count = 0; | |
143 | for (i = 0; i < n; ++i) { | |
144 | if (S_ISDIR(entries[i].mode)) | |
145 | ++count; | |
146 | } | |
147 | ||
148 | return count; | |
149 | } | |
150 | ||
5096add8 KC |
151 | int maps_protect; |
152 | EXPORT_SYMBOL(maps_protect); | |
153 | ||
0494f6ec | 154 | static struct fs_struct *get_fs_struct(struct task_struct *task) |
1da177e4 LT |
155 | { |
156 | struct fs_struct *fs; | |
0494f6ec MS |
157 | task_lock(task); |
158 | fs = task->fs; | |
1da177e4 LT |
159 | if(fs) |
160 | atomic_inc(&fs->count); | |
0494f6ec MS |
161 | task_unlock(task); |
162 | return fs; | |
163 | } | |
164 | ||
99f89551 EB |
165 | static int get_nr_threads(struct task_struct *tsk) |
166 | { | |
167 | /* Must be called with the rcu_read_lock held */ | |
168 | unsigned long flags; | |
169 | int count = 0; | |
170 | ||
171 | if (lock_task_sighand(tsk, &flags)) { | |
172 | count = atomic_read(&tsk->signal->count); | |
173 | unlock_task_sighand(tsk, &flags); | |
174 | } | |
175 | return count; | |
176 | } | |
177 | ||
3dcd25f3 | 178 | static int proc_cwd_link(struct inode *inode, struct path *path) |
0494f6ec | 179 | { |
99f89551 EB |
180 | struct task_struct *task = get_proc_task(inode); |
181 | struct fs_struct *fs = NULL; | |
0494f6ec | 182 | int result = -ENOENT; |
99f89551 EB |
183 | |
184 | if (task) { | |
185 | fs = get_fs_struct(task); | |
186 | put_task_struct(task); | |
187 | } | |
1da177e4 LT |
188 | if (fs) { |
189 | read_lock(&fs->lock); | |
3dcd25f3 JB |
190 | *path = fs->pwd; |
191 | path_get(&fs->pwd); | |
1da177e4 LT |
192 | read_unlock(&fs->lock); |
193 | result = 0; | |
194 | put_fs_struct(fs); | |
195 | } | |
196 | return result; | |
197 | } | |
198 | ||
3dcd25f3 | 199 | static int proc_root_link(struct inode *inode, struct path *path) |
1da177e4 | 200 | { |
99f89551 EB |
201 | struct task_struct *task = get_proc_task(inode); |
202 | struct fs_struct *fs = NULL; | |
1da177e4 | 203 | int result = -ENOENT; |
99f89551 EB |
204 | |
205 | if (task) { | |
206 | fs = get_fs_struct(task); | |
207 | put_task_struct(task); | |
208 | } | |
1da177e4 LT |
209 | if (fs) { |
210 | read_lock(&fs->lock); | |
3dcd25f3 JB |
211 | *path = fs->root; |
212 | path_get(&fs->root); | |
1da177e4 LT |
213 | read_unlock(&fs->lock); |
214 | result = 0; | |
215 | put_fs_struct(fs); | |
216 | } | |
217 | return result; | |
218 | } | |
219 | ||
638fa202 RM |
220 | /* |
221 | * Return zero if current may access user memory in @task, -error if not. | |
222 | */ | |
223 | static int check_mem_permission(struct task_struct *task) | |
224 | { | |
225 | /* | |
226 | * A task can always look at itself, in case it chooses | |
227 | * to use system calls instead of load instructions. | |
228 | */ | |
229 | if (task == current) | |
230 | return 0; | |
231 | ||
232 | /* | |
233 | * If current is actively ptrace'ing, and would also be | |
234 | * permitted to freshly attach with ptrace now, permit it. | |
235 | */ | |
0d094efe RM |
236 | if (task_is_stopped_or_traced(task)) { |
237 | int match; | |
238 | rcu_read_lock(); | |
239 | match = (tracehook_tracer_task(task) == current); | |
240 | rcu_read_unlock(); | |
241 | if (match && ptrace_may_access(task, PTRACE_MODE_ATTACH)) | |
242 | return 0; | |
243 | } | |
638fa202 RM |
244 | |
245 | /* | |
246 | * Noone else is allowed. | |
247 | */ | |
248 | return -EPERM; | |
249 | } | |
1da177e4 | 250 | |
831830b5 AV |
251 | struct mm_struct *mm_for_maps(struct task_struct *task) |
252 | { | |
253 | struct mm_struct *mm = get_task_mm(task); | |
254 | if (!mm) | |
255 | return NULL; | |
256 | down_read(&mm->mmap_sem); | |
257 | task_lock(task); | |
258 | if (task->mm != mm) | |
259 | goto out; | |
006ebb40 SS |
260 | if (task->mm != current->mm && |
261 | __ptrace_may_access(task, PTRACE_MODE_READ) < 0) | |
831830b5 AV |
262 | goto out; |
263 | task_unlock(task); | |
264 | return mm; | |
265 | out: | |
266 | task_unlock(task); | |
267 | up_read(&mm->mmap_sem); | |
268 | mmput(mm); | |
269 | return NULL; | |
270 | } | |
271 | ||
1da177e4 LT |
272 | static int proc_pid_cmdline(struct task_struct *task, char * buffer) |
273 | { | |
274 | int res = 0; | |
275 | unsigned int len; | |
276 | struct mm_struct *mm = get_task_mm(task); | |
277 | if (!mm) | |
278 | goto out; | |
279 | if (!mm->arg_end) | |
280 | goto out_mm; /* Shh! No looking before we're done */ | |
281 | ||
282 | len = mm->arg_end - mm->arg_start; | |
283 | ||
284 | if (len > PAGE_SIZE) | |
285 | len = PAGE_SIZE; | |
286 | ||
287 | res = access_process_vm(task, mm->arg_start, buffer, len, 0); | |
288 | ||
289 | // If the nul at the end of args has been overwritten, then | |
290 | // assume application is using setproctitle(3). | |
291 | if (res > 0 && buffer[res-1] != '\0' && len < PAGE_SIZE) { | |
292 | len = strnlen(buffer, res); | |
293 | if (len < res) { | |
294 | res = len; | |
295 | } else { | |
296 | len = mm->env_end - mm->env_start; | |
297 | if (len > PAGE_SIZE - res) | |
298 | len = PAGE_SIZE - res; | |
299 | res += access_process_vm(task, mm->env_start, buffer+res, len, 0); | |
300 | res = strnlen(buffer, res); | |
301 | } | |
302 | } | |
303 | out_mm: | |
304 | mmput(mm); | |
305 | out: | |
306 | return res; | |
307 | } | |
308 | ||
309 | static int proc_pid_auxv(struct task_struct *task, char *buffer) | |
310 | { | |
311 | int res = 0; | |
312 | struct mm_struct *mm = get_task_mm(task); | |
313 | if (mm) { | |
314 | unsigned int nwords = 0; | |
315 | do | |
316 | nwords += 2; | |
317 | while (mm->saved_auxv[nwords - 2] != 0); /* AT_NULL */ | |
318 | res = nwords * sizeof(mm->saved_auxv[0]); | |
319 | if (res > PAGE_SIZE) | |
320 | res = PAGE_SIZE; | |
321 | memcpy(buffer, mm->saved_auxv, res); | |
322 | mmput(mm); | |
323 | } | |
324 | return res; | |
325 | } | |
326 | ||
327 | ||
328 | #ifdef CONFIG_KALLSYMS | |
329 | /* | |
330 | * Provides a wchan file via kallsyms in a proper one-value-per-file format. | |
331 | * Returns the resolved symbol. If that fails, simply return the address. | |
332 | */ | |
333 | static int proc_pid_wchan(struct task_struct *task, char *buffer) | |
334 | { | |
ffb45122 | 335 | unsigned long wchan; |
9281acea | 336 | char symname[KSYM_NAME_LEN]; |
1da177e4 LT |
337 | |
338 | wchan = get_wchan(task); | |
339 | ||
9d65cb4a AD |
340 | if (lookup_symbol_name(wchan, symname) < 0) |
341 | return sprintf(buffer, "%lu", wchan); | |
342 | else | |
343 | return sprintf(buffer, "%s", symname); | |
1da177e4 LT |
344 | } |
345 | #endif /* CONFIG_KALLSYMS */ | |
346 | ||
347 | #ifdef CONFIG_SCHEDSTATS | |
348 | /* | |
349 | * Provides /proc/PID/schedstat | |
350 | */ | |
351 | static int proc_pid_schedstat(struct task_struct *task, char *buffer) | |
352 | { | |
172ba844 | 353 | return sprintf(buffer, "%llu %llu %lu\n", |
1da177e4 LT |
354 | task->sched_info.cpu_time, |
355 | task->sched_info.run_delay, | |
2d72376b | 356 | task->sched_info.pcount); |
1da177e4 LT |
357 | } |
358 | #endif | |
359 | ||
9745512c AV |
360 | #ifdef CONFIG_LATENCYTOP |
361 | static int lstats_show_proc(struct seq_file *m, void *v) | |
362 | { | |
363 | int i; | |
13d77c37 HS |
364 | struct inode *inode = m->private; |
365 | struct task_struct *task = get_proc_task(inode); | |
9745512c | 366 | |
13d77c37 HS |
367 | if (!task) |
368 | return -ESRCH; | |
369 | seq_puts(m, "Latency Top version : v0.1\n"); | |
9745512c AV |
370 | for (i = 0; i < 32; i++) { |
371 | if (task->latency_record[i].backtrace[0]) { | |
372 | int q; | |
373 | seq_printf(m, "%i %li %li ", | |
374 | task->latency_record[i].count, | |
375 | task->latency_record[i].time, | |
376 | task->latency_record[i].max); | |
377 | for (q = 0; q < LT_BACKTRACEDEPTH; q++) { | |
378 | char sym[KSYM_NAME_LEN]; | |
379 | char *c; | |
380 | if (!task->latency_record[i].backtrace[q]) | |
381 | break; | |
382 | if (task->latency_record[i].backtrace[q] == ULONG_MAX) | |
383 | break; | |
384 | sprint_symbol(sym, task->latency_record[i].backtrace[q]); | |
385 | c = strchr(sym, '+'); | |
386 | if (c) | |
387 | *c = 0; | |
388 | seq_printf(m, "%s ", sym); | |
389 | } | |
390 | seq_printf(m, "\n"); | |
391 | } | |
392 | ||
393 | } | |
13d77c37 | 394 | put_task_struct(task); |
9745512c AV |
395 | return 0; |
396 | } | |
397 | ||
398 | static int lstats_open(struct inode *inode, struct file *file) | |
399 | { | |
13d77c37 | 400 | return single_open(file, lstats_show_proc, inode); |
d6643d12 HS |
401 | } |
402 | ||
9745512c AV |
403 | static ssize_t lstats_write(struct file *file, const char __user *buf, |
404 | size_t count, loff_t *offs) | |
405 | { | |
13d77c37 | 406 | struct task_struct *task = get_proc_task(file->f_dentry->d_inode); |
9745512c | 407 | |
13d77c37 HS |
408 | if (!task) |
409 | return -ESRCH; | |
9745512c | 410 | clear_all_latency_tracing(task); |
13d77c37 | 411 | put_task_struct(task); |
9745512c AV |
412 | |
413 | return count; | |
414 | } | |
415 | ||
416 | static const struct file_operations proc_lstats_operations = { | |
417 | .open = lstats_open, | |
418 | .read = seq_read, | |
419 | .write = lstats_write, | |
420 | .llseek = seq_lseek, | |
13d77c37 | 421 | .release = single_release, |
9745512c AV |
422 | }; |
423 | ||
424 | #endif | |
425 | ||
1da177e4 LT |
426 | /* The badness from the OOM killer */ |
427 | unsigned long badness(struct task_struct *p, unsigned long uptime); | |
428 | static int proc_oom_score(struct task_struct *task, char *buffer) | |
429 | { | |
430 | unsigned long points; | |
431 | struct timespec uptime; | |
432 | ||
433 | do_posix_clock_monotonic_gettime(&uptime); | |
19c5d45a | 434 | read_lock(&tasklist_lock); |
1da177e4 | 435 | points = badness(task, uptime.tv_sec); |
19c5d45a | 436 | read_unlock(&tasklist_lock); |
1da177e4 LT |
437 | return sprintf(buffer, "%lu\n", points); |
438 | } | |
439 | ||
d85f50d5 NH |
440 | struct limit_names { |
441 | char *name; | |
442 | char *unit; | |
443 | }; | |
444 | ||
445 | static const struct limit_names lnames[RLIM_NLIMITS] = { | |
446 | [RLIMIT_CPU] = {"Max cpu time", "ms"}, | |
447 | [RLIMIT_FSIZE] = {"Max file size", "bytes"}, | |
448 | [RLIMIT_DATA] = {"Max data size", "bytes"}, | |
449 | [RLIMIT_STACK] = {"Max stack size", "bytes"}, | |
450 | [RLIMIT_CORE] = {"Max core file size", "bytes"}, | |
451 | [RLIMIT_RSS] = {"Max resident set", "bytes"}, | |
452 | [RLIMIT_NPROC] = {"Max processes", "processes"}, | |
453 | [RLIMIT_NOFILE] = {"Max open files", "files"}, | |
454 | [RLIMIT_MEMLOCK] = {"Max locked memory", "bytes"}, | |
455 | [RLIMIT_AS] = {"Max address space", "bytes"}, | |
456 | [RLIMIT_LOCKS] = {"Max file locks", "locks"}, | |
457 | [RLIMIT_SIGPENDING] = {"Max pending signals", "signals"}, | |
458 | [RLIMIT_MSGQUEUE] = {"Max msgqueue size", "bytes"}, | |
459 | [RLIMIT_NICE] = {"Max nice priority", NULL}, | |
460 | [RLIMIT_RTPRIO] = {"Max realtime priority", NULL}, | |
8808117c | 461 | [RLIMIT_RTTIME] = {"Max realtime timeout", "us"}, |
d85f50d5 NH |
462 | }; |
463 | ||
464 | /* Display limits for a process */ | |
465 | static int proc_pid_limits(struct task_struct *task, char *buffer) | |
466 | { | |
467 | unsigned int i; | |
468 | int count = 0; | |
469 | unsigned long flags; | |
470 | char *bufptr = buffer; | |
471 | ||
472 | struct rlimit rlim[RLIM_NLIMITS]; | |
473 | ||
474 | rcu_read_lock(); | |
475 | if (!lock_task_sighand(task,&flags)) { | |
476 | rcu_read_unlock(); | |
477 | return 0; | |
478 | } | |
479 | memcpy(rlim, task->signal->rlim, sizeof(struct rlimit) * RLIM_NLIMITS); | |
480 | unlock_task_sighand(task, &flags); | |
481 | rcu_read_unlock(); | |
482 | ||
483 | /* | |
484 | * print the file header | |
485 | */ | |
486 | count += sprintf(&bufptr[count], "%-25s %-20s %-20s %-10s\n", | |
487 | "Limit", "Soft Limit", "Hard Limit", "Units"); | |
488 | ||
489 | for (i = 0; i < RLIM_NLIMITS; i++) { | |
490 | if (rlim[i].rlim_cur == RLIM_INFINITY) | |
491 | count += sprintf(&bufptr[count], "%-25s %-20s ", | |
492 | lnames[i].name, "unlimited"); | |
493 | else | |
494 | count += sprintf(&bufptr[count], "%-25s %-20lu ", | |
495 | lnames[i].name, rlim[i].rlim_cur); | |
496 | ||
497 | if (rlim[i].rlim_max == RLIM_INFINITY) | |
498 | count += sprintf(&bufptr[count], "%-20s ", "unlimited"); | |
499 | else | |
500 | count += sprintf(&bufptr[count], "%-20lu ", | |
501 | rlim[i].rlim_max); | |
502 | ||
503 | if (lnames[i].unit) | |
504 | count += sprintf(&bufptr[count], "%-10s\n", | |
505 | lnames[i].unit); | |
506 | else | |
507 | count += sprintf(&bufptr[count], "\n"); | |
508 | } | |
509 | ||
510 | return count; | |
511 | } | |
512 | ||
ebcb6734 RM |
513 | #ifdef CONFIG_HAVE_ARCH_TRACEHOOK |
514 | static int proc_pid_syscall(struct task_struct *task, char *buffer) | |
515 | { | |
516 | long nr; | |
517 | unsigned long args[6], sp, pc; | |
518 | ||
519 | if (task_current_syscall(task, &nr, args, 6, &sp, &pc)) | |
520 | return sprintf(buffer, "running\n"); | |
521 | ||
522 | if (nr < 0) | |
523 | return sprintf(buffer, "%ld 0x%lx 0x%lx\n", nr, sp, pc); | |
524 | ||
525 | return sprintf(buffer, | |
526 | "%ld 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx\n", | |
527 | nr, | |
528 | args[0], args[1], args[2], args[3], args[4], args[5], | |
529 | sp, pc); | |
530 | } | |
531 | #endif /* CONFIG_HAVE_ARCH_TRACEHOOK */ | |
532 | ||
1da177e4 LT |
533 | /************************************************************************/ |
534 | /* Here the fs part begins */ | |
535 | /************************************************************************/ | |
536 | ||
537 | /* permission checks */ | |
778c1144 | 538 | static int proc_fd_access_allowed(struct inode *inode) |
1da177e4 | 539 | { |
778c1144 EB |
540 | struct task_struct *task; |
541 | int allowed = 0; | |
df26c40e EB |
542 | /* Allow access to a task's file descriptors if it is us or we |
543 | * may use ptrace attach to the process and find out that | |
544 | * information. | |
778c1144 EB |
545 | */ |
546 | task = get_proc_task(inode); | |
df26c40e | 547 | if (task) { |
006ebb40 | 548 | allowed = ptrace_may_access(task, PTRACE_MODE_READ); |
778c1144 | 549 | put_task_struct(task); |
df26c40e | 550 | } |
778c1144 | 551 | return allowed; |
1da177e4 LT |
552 | } |
553 | ||
6d76fa58 LT |
554 | static int proc_setattr(struct dentry *dentry, struct iattr *attr) |
555 | { | |
556 | int error; | |
557 | struct inode *inode = dentry->d_inode; | |
558 | ||
559 | if (attr->ia_valid & ATTR_MODE) | |
560 | return -EPERM; | |
561 | ||
562 | error = inode_change_ok(inode, attr); | |
1e8123fd JJ |
563 | if (!error) |
564 | error = inode_setattr(inode, attr); | |
6d76fa58 LT |
565 | return error; |
566 | } | |
567 | ||
c5ef1c42 | 568 | static const struct inode_operations proc_def_inode_operations = { |
6d76fa58 LT |
569 | .setattr = proc_setattr, |
570 | }; | |
571 | ||
a1a2c409 MS |
572 | static int mounts_open_common(struct inode *inode, struct file *file, |
573 | const struct seq_operations *op) | |
1da177e4 | 574 | { |
99f89551 | 575 | struct task_struct *task = get_proc_task(inode); |
cf7b708c | 576 | struct nsproxy *nsp; |
6b3286ed | 577 | struct mnt_namespace *ns = NULL; |
a1a2c409 MS |
578 | struct fs_struct *fs = NULL; |
579 | struct path root; | |
5addc5dd AV |
580 | struct proc_mounts *p; |
581 | int ret = -EINVAL; | |
1da177e4 | 582 | |
99f89551 | 583 | if (task) { |
cf7b708c PE |
584 | rcu_read_lock(); |
585 | nsp = task_nsproxy(task); | |
586 | if (nsp) { | |
587 | ns = nsp->mnt_ns; | |
863c4702 AD |
588 | if (ns) |
589 | get_mnt_ns(ns); | |
590 | } | |
cf7b708c | 591 | rcu_read_unlock(); |
a1a2c409 MS |
592 | if (ns) |
593 | fs = get_fs_struct(task); | |
99f89551 EB |
594 | put_task_struct(task); |
595 | } | |
5addc5dd | 596 | |
a1a2c409 MS |
597 | if (!ns) |
598 | goto err; | |
599 | if (!fs) | |
600 | goto err_put_ns; | |
601 | ||
602 | read_lock(&fs->lock); | |
603 | root = fs->root; | |
604 | path_get(&root); | |
605 | read_unlock(&fs->lock); | |
606 | put_fs_struct(fs); | |
607 | ||
608 | ret = -ENOMEM; | |
609 | p = kmalloc(sizeof(struct proc_mounts), GFP_KERNEL); | |
610 | if (!p) | |
611 | goto err_put_path; | |
612 | ||
613 | file->private_data = &p->m; | |
614 | ret = seq_open(file, op); | |
615 | if (ret) | |
616 | goto err_free; | |
617 | ||
618 | p->m.private = p; | |
619 | p->ns = ns; | |
620 | p->root = root; | |
621 | p->event = ns->event; | |
622 | ||
623 | return 0; | |
624 | ||
625 | err_free: | |
626 | kfree(p); | |
627 | err_put_path: | |
628 | path_put(&root); | |
629 | err_put_ns: | |
630 | put_mnt_ns(ns); | |
631 | err: | |
1da177e4 LT |
632 | return ret; |
633 | } | |
634 | ||
635 | static int mounts_release(struct inode *inode, struct file *file) | |
636 | { | |
a1a2c409 MS |
637 | struct proc_mounts *p = file->private_data; |
638 | path_put(&p->root); | |
639 | put_mnt_ns(p->ns); | |
1da177e4 LT |
640 | return seq_release(inode, file); |
641 | } | |
642 | ||
5addc5dd AV |
643 | static unsigned mounts_poll(struct file *file, poll_table *wait) |
644 | { | |
645 | struct proc_mounts *p = file->private_data; | |
a1a2c409 | 646 | struct mnt_namespace *ns = p->ns; |
5addc5dd AV |
647 | unsigned res = 0; |
648 | ||
649 | poll_wait(file, &ns->poll, wait); | |
650 | ||
651 | spin_lock(&vfsmount_lock); | |
652 | if (p->event != ns->event) { | |
653 | p->event = ns->event; | |
654 | res = POLLERR; | |
655 | } | |
656 | spin_unlock(&vfsmount_lock); | |
657 | ||
658 | return res; | |
659 | } | |
660 | ||
a1a2c409 MS |
661 | static int mounts_open(struct inode *inode, struct file *file) |
662 | { | |
663 | return mounts_open_common(inode, file, &mounts_op); | |
664 | } | |
665 | ||
00977a59 | 666 | static const struct file_operations proc_mounts_operations = { |
1da177e4 LT |
667 | .open = mounts_open, |
668 | .read = seq_read, | |
669 | .llseek = seq_lseek, | |
670 | .release = mounts_release, | |
5addc5dd | 671 | .poll = mounts_poll, |
1da177e4 LT |
672 | }; |
673 | ||
2d4d4864 RP |
674 | static int mountinfo_open(struct inode *inode, struct file *file) |
675 | { | |
676 | return mounts_open_common(inode, file, &mountinfo_op); | |
677 | } | |
678 | ||
679 | static const struct file_operations proc_mountinfo_operations = { | |
680 | .open = mountinfo_open, | |
681 | .read = seq_read, | |
682 | .llseek = seq_lseek, | |
683 | .release = mounts_release, | |
684 | .poll = mounts_poll, | |
685 | }; | |
686 | ||
b4629fe2 CL |
687 | static int mountstats_open(struct inode *inode, struct file *file) |
688 | { | |
a1a2c409 | 689 | return mounts_open_common(inode, file, &mountstats_op); |
b4629fe2 CL |
690 | } |
691 | ||
00977a59 | 692 | static const struct file_operations proc_mountstats_operations = { |
b4629fe2 CL |
693 | .open = mountstats_open, |
694 | .read = seq_read, | |
695 | .llseek = seq_lseek, | |
696 | .release = mounts_release, | |
697 | }; | |
698 | ||
1da177e4 LT |
699 | #define PROC_BLOCK_SIZE (3*1024) /* 4K page size but our output routines use some slack for overruns */ |
700 | ||
701 | static ssize_t proc_info_read(struct file * file, char __user * buf, | |
702 | size_t count, loff_t *ppos) | |
703 | { | |
2fddfeef | 704 | struct inode * inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
705 | unsigned long page; |
706 | ssize_t length; | |
99f89551 EB |
707 | struct task_struct *task = get_proc_task(inode); |
708 | ||
709 | length = -ESRCH; | |
710 | if (!task) | |
711 | goto out_no_task; | |
1da177e4 LT |
712 | |
713 | if (count > PROC_BLOCK_SIZE) | |
714 | count = PROC_BLOCK_SIZE; | |
99f89551 EB |
715 | |
716 | length = -ENOMEM; | |
e12ba74d | 717 | if (!(page = __get_free_page(GFP_TEMPORARY))) |
99f89551 | 718 | goto out; |
1da177e4 LT |
719 | |
720 | length = PROC_I(inode)->op.proc_read(task, (char*)page); | |
721 | ||
722 | if (length >= 0) | |
723 | length = simple_read_from_buffer(buf, count, ppos, (char *)page, length); | |
724 | free_page(page); | |
99f89551 EB |
725 | out: |
726 | put_task_struct(task); | |
727 | out_no_task: | |
1da177e4 LT |
728 | return length; |
729 | } | |
730 | ||
00977a59 | 731 | static const struct file_operations proc_info_file_operations = { |
1da177e4 LT |
732 | .read = proc_info_read, |
733 | }; | |
734 | ||
be614086 EB |
735 | static int proc_single_show(struct seq_file *m, void *v) |
736 | { | |
737 | struct inode *inode = m->private; | |
738 | struct pid_namespace *ns; | |
739 | struct pid *pid; | |
740 | struct task_struct *task; | |
741 | int ret; | |
742 | ||
743 | ns = inode->i_sb->s_fs_info; | |
744 | pid = proc_pid(inode); | |
745 | task = get_pid_task(pid, PIDTYPE_PID); | |
746 | if (!task) | |
747 | return -ESRCH; | |
748 | ||
749 | ret = PROC_I(inode)->op.proc_show(m, ns, pid, task); | |
750 | ||
751 | put_task_struct(task); | |
752 | return ret; | |
753 | } | |
754 | ||
755 | static int proc_single_open(struct inode *inode, struct file *filp) | |
756 | { | |
757 | int ret; | |
758 | ret = single_open(filp, proc_single_show, NULL); | |
759 | if (!ret) { | |
760 | struct seq_file *m = filp->private_data; | |
761 | ||
762 | m->private = inode; | |
763 | } | |
764 | return ret; | |
765 | } | |
766 | ||
767 | static const struct file_operations proc_single_file_operations = { | |
768 | .open = proc_single_open, | |
769 | .read = seq_read, | |
770 | .llseek = seq_lseek, | |
771 | .release = single_release, | |
772 | }; | |
773 | ||
1da177e4 LT |
774 | static int mem_open(struct inode* inode, struct file* file) |
775 | { | |
776 | file->private_data = (void*)((long)current->self_exec_id); | |
777 | return 0; | |
778 | } | |
779 | ||
780 | static ssize_t mem_read(struct file * file, char __user * buf, | |
781 | size_t count, loff_t *ppos) | |
782 | { | |
2fddfeef | 783 | struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode); |
1da177e4 LT |
784 | char *page; |
785 | unsigned long src = *ppos; | |
786 | int ret = -ESRCH; | |
787 | struct mm_struct *mm; | |
788 | ||
99f89551 EB |
789 | if (!task) |
790 | goto out_no_task; | |
791 | ||
638fa202 | 792 | if (check_mem_permission(task)) |
1da177e4 LT |
793 | goto out; |
794 | ||
795 | ret = -ENOMEM; | |
e12ba74d | 796 | page = (char *)__get_free_page(GFP_TEMPORARY); |
1da177e4 LT |
797 | if (!page) |
798 | goto out; | |
799 | ||
800 | ret = 0; | |
801 | ||
802 | mm = get_task_mm(task); | |
803 | if (!mm) | |
804 | goto out_free; | |
805 | ||
806 | ret = -EIO; | |
807 | ||
808 | if (file->private_data != (void*)((long)current->self_exec_id)) | |
809 | goto out_put; | |
810 | ||
811 | ret = 0; | |
812 | ||
813 | while (count > 0) { | |
814 | int this_len, retval; | |
815 | ||
816 | this_len = (count > PAGE_SIZE) ? PAGE_SIZE : count; | |
817 | retval = access_process_vm(task, src, page, this_len, 0); | |
638fa202 | 818 | if (!retval || check_mem_permission(task)) { |
1da177e4 LT |
819 | if (!ret) |
820 | ret = -EIO; | |
821 | break; | |
822 | } | |
823 | ||
824 | if (copy_to_user(buf, page, retval)) { | |
825 | ret = -EFAULT; | |
826 | break; | |
827 | } | |
828 | ||
829 | ret += retval; | |
830 | src += retval; | |
831 | buf += retval; | |
832 | count -= retval; | |
833 | } | |
834 | *ppos = src; | |
835 | ||
836 | out_put: | |
837 | mmput(mm); | |
838 | out_free: | |
839 | free_page((unsigned long) page); | |
840 | out: | |
99f89551 EB |
841 | put_task_struct(task); |
842 | out_no_task: | |
1da177e4 LT |
843 | return ret; |
844 | } | |
845 | ||
846 | #define mem_write NULL | |
847 | ||
848 | #ifndef mem_write | |
849 | /* This is a security hazard */ | |
63967fa9 | 850 | static ssize_t mem_write(struct file * file, const char __user *buf, |
1da177e4 LT |
851 | size_t count, loff_t *ppos) |
852 | { | |
f7ca54f4 | 853 | int copied; |
1da177e4 | 854 | char *page; |
2fddfeef | 855 | struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode); |
1da177e4 LT |
856 | unsigned long dst = *ppos; |
857 | ||
99f89551 EB |
858 | copied = -ESRCH; |
859 | if (!task) | |
860 | goto out_no_task; | |
861 | ||
638fa202 | 862 | if (check_mem_permission(task)) |
99f89551 | 863 | goto out; |
1da177e4 | 864 | |
99f89551 | 865 | copied = -ENOMEM; |
e12ba74d | 866 | page = (char *)__get_free_page(GFP_TEMPORARY); |
1da177e4 | 867 | if (!page) |
99f89551 | 868 | goto out; |
1da177e4 | 869 | |
f7ca54f4 | 870 | copied = 0; |
1da177e4 LT |
871 | while (count > 0) { |
872 | int this_len, retval; | |
873 | ||
874 | this_len = (count > PAGE_SIZE) ? PAGE_SIZE : count; | |
875 | if (copy_from_user(page, buf, this_len)) { | |
876 | copied = -EFAULT; | |
877 | break; | |
878 | } | |
879 | retval = access_process_vm(task, dst, page, this_len, 1); | |
880 | if (!retval) { | |
881 | if (!copied) | |
882 | copied = -EIO; | |
883 | break; | |
884 | } | |
885 | copied += retval; | |
886 | buf += retval; | |
887 | dst += retval; | |
888 | count -= retval; | |
889 | } | |
890 | *ppos = dst; | |
891 | free_page((unsigned long) page); | |
99f89551 EB |
892 | out: |
893 | put_task_struct(task); | |
894 | out_no_task: | |
1da177e4 LT |
895 | return copied; |
896 | } | |
897 | #endif | |
898 | ||
85863e47 | 899 | loff_t mem_lseek(struct file *file, loff_t offset, int orig) |
1da177e4 LT |
900 | { |
901 | switch (orig) { | |
902 | case 0: | |
903 | file->f_pos = offset; | |
904 | break; | |
905 | case 1: | |
906 | file->f_pos += offset; | |
907 | break; | |
908 | default: | |
909 | return -EINVAL; | |
910 | } | |
911 | force_successful_syscall_return(); | |
912 | return file->f_pos; | |
913 | } | |
914 | ||
00977a59 | 915 | static const struct file_operations proc_mem_operations = { |
1da177e4 LT |
916 | .llseek = mem_lseek, |
917 | .read = mem_read, | |
918 | .write = mem_write, | |
919 | .open = mem_open, | |
920 | }; | |
921 | ||
315e28c8 JP |
922 | static ssize_t environ_read(struct file *file, char __user *buf, |
923 | size_t count, loff_t *ppos) | |
924 | { | |
925 | struct task_struct *task = get_proc_task(file->f_dentry->d_inode); | |
926 | char *page; | |
927 | unsigned long src = *ppos; | |
928 | int ret = -ESRCH; | |
929 | struct mm_struct *mm; | |
930 | ||
931 | if (!task) | |
932 | goto out_no_task; | |
933 | ||
006ebb40 | 934 | if (!ptrace_may_access(task, PTRACE_MODE_READ)) |
315e28c8 JP |
935 | goto out; |
936 | ||
937 | ret = -ENOMEM; | |
938 | page = (char *)__get_free_page(GFP_TEMPORARY); | |
939 | if (!page) | |
940 | goto out; | |
941 | ||
942 | ret = 0; | |
943 | ||
944 | mm = get_task_mm(task); | |
945 | if (!mm) | |
946 | goto out_free; | |
947 | ||
948 | while (count > 0) { | |
949 | int this_len, retval, max_len; | |
950 | ||
951 | this_len = mm->env_end - (mm->env_start + src); | |
952 | ||
953 | if (this_len <= 0) | |
954 | break; | |
955 | ||
956 | max_len = (count > PAGE_SIZE) ? PAGE_SIZE : count; | |
957 | this_len = (this_len > max_len) ? max_len : this_len; | |
958 | ||
959 | retval = access_process_vm(task, (mm->env_start + src), | |
960 | page, this_len, 0); | |
961 | ||
962 | if (retval <= 0) { | |
963 | ret = retval; | |
964 | break; | |
965 | } | |
966 | ||
967 | if (copy_to_user(buf, page, retval)) { | |
968 | ret = -EFAULT; | |
969 | break; | |
970 | } | |
971 | ||
972 | ret += retval; | |
973 | src += retval; | |
974 | buf += retval; | |
975 | count -= retval; | |
976 | } | |
977 | *ppos = src; | |
978 | ||
979 | mmput(mm); | |
980 | out_free: | |
981 | free_page((unsigned long) page); | |
982 | out: | |
983 | put_task_struct(task); | |
984 | out_no_task: | |
985 | return ret; | |
986 | } | |
987 | ||
988 | static const struct file_operations proc_environ_operations = { | |
989 | .read = environ_read, | |
990 | }; | |
991 | ||
1da177e4 LT |
992 | static ssize_t oom_adjust_read(struct file *file, char __user *buf, |
993 | size_t count, loff_t *ppos) | |
994 | { | |
2fddfeef | 995 | struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode); |
8578cea7 | 996 | char buffer[PROC_NUMBUF]; |
1da177e4 | 997 | size_t len; |
99f89551 | 998 | int oom_adjust; |
1da177e4 | 999 | |
99f89551 EB |
1000 | if (!task) |
1001 | return -ESRCH; | |
1002 | oom_adjust = task->oomkilladj; | |
1003 | put_task_struct(task); | |
1004 | ||
8578cea7 | 1005 | len = snprintf(buffer, sizeof(buffer), "%i\n", oom_adjust); |
0c28f287 AM |
1006 | |
1007 | return simple_read_from_buffer(buf, count, ppos, buffer, len); | |
1da177e4 LT |
1008 | } |
1009 | ||
1010 | static ssize_t oom_adjust_write(struct file *file, const char __user *buf, | |
1011 | size_t count, loff_t *ppos) | |
1012 | { | |
99f89551 | 1013 | struct task_struct *task; |
8578cea7 | 1014 | char buffer[PROC_NUMBUF], *end; |
1da177e4 LT |
1015 | int oom_adjust; |
1016 | ||
8578cea7 EB |
1017 | memset(buffer, 0, sizeof(buffer)); |
1018 | if (count > sizeof(buffer) - 1) | |
1019 | count = sizeof(buffer) - 1; | |
1da177e4 LT |
1020 | if (copy_from_user(buffer, buf, count)) |
1021 | return -EFAULT; | |
1022 | oom_adjust = simple_strtol(buffer, &end, 0); | |
8ac773b4 AD |
1023 | if ((oom_adjust < OOM_ADJUST_MIN || oom_adjust > OOM_ADJUST_MAX) && |
1024 | oom_adjust != OOM_DISABLE) | |
1da177e4 LT |
1025 | return -EINVAL; |
1026 | if (*end == '\n') | |
1027 | end++; | |
2fddfeef | 1028 | task = get_proc_task(file->f_path.dentry->d_inode); |
99f89551 EB |
1029 | if (!task) |
1030 | return -ESRCH; | |
8fb4fc68 GJ |
1031 | if (oom_adjust < task->oomkilladj && !capable(CAP_SYS_RESOURCE)) { |
1032 | put_task_struct(task); | |
1033 | return -EACCES; | |
1034 | } | |
1da177e4 | 1035 | task->oomkilladj = oom_adjust; |
99f89551 | 1036 | put_task_struct(task); |
1da177e4 LT |
1037 | if (end - buffer == 0) |
1038 | return -EIO; | |
1039 | return end - buffer; | |
1040 | } | |
1041 | ||
00977a59 | 1042 | static const struct file_operations proc_oom_adjust_operations = { |
1da177e4 LT |
1043 | .read = oom_adjust_read, |
1044 | .write = oom_adjust_write, | |
1045 | }; | |
1046 | ||
1da177e4 LT |
1047 | #ifdef CONFIG_AUDITSYSCALL |
1048 | #define TMPBUFLEN 21 | |
1049 | static ssize_t proc_loginuid_read(struct file * file, char __user * buf, | |
1050 | size_t count, loff_t *ppos) | |
1051 | { | |
2fddfeef | 1052 | struct inode * inode = file->f_path.dentry->d_inode; |
99f89551 | 1053 | struct task_struct *task = get_proc_task(inode); |
1da177e4 LT |
1054 | ssize_t length; |
1055 | char tmpbuf[TMPBUFLEN]; | |
1056 | ||
99f89551 EB |
1057 | if (!task) |
1058 | return -ESRCH; | |
1da177e4 | 1059 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", |
0c11b942 | 1060 | audit_get_loginuid(task)); |
99f89551 | 1061 | put_task_struct(task); |
1da177e4 LT |
1062 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); |
1063 | } | |
1064 | ||
1065 | static ssize_t proc_loginuid_write(struct file * file, const char __user * buf, | |
1066 | size_t count, loff_t *ppos) | |
1067 | { | |
2fddfeef | 1068 | struct inode * inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
1069 | char *page, *tmp; |
1070 | ssize_t length; | |
1da177e4 LT |
1071 | uid_t loginuid; |
1072 | ||
1073 | if (!capable(CAP_AUDIT_CONTROL)) | |
1074 | return -EPERM; | |
1075 | ||
13b41b09 | 1076 | if (current != pid_task(proc_pid(inode), PIDTYPE_PID)) |
1da177e4 LT |
1077 | return -EPERM; |
1078 | ||
e0182909 AV |
1079 | if (count >= PAGE_SIZE) |
1080 | count = PAGE_SIZE - 1; | |
1da177e4 LT |
1081 | |
1082 | if (*ppos != 0) { | |
1083 | /* No partial writes. */ | |
1084 | return -EINVAL; | |
1085 | } | |
e12ba74d | 1086 | page = (char*)__get_free_page(GFP_TEMPORARY); |
1da177e4 LT |
1087 | if (!page) |
1088 | return -ENOMEM; | |
1089 | length = -EFAULT; | |
1090 | if (copy_from_user(page, buf, count)) | |
1091 | goto out_free_page; | |
1092 | ||
e0182909 | 1093 | page[count] = '\0'; |
1da177e4 LT |
1094 | loginuid = simple_strtoul(page, &tmp, 10); |
1095 | if (tmp == page) { | |
1096 | length = -EINVAL; | |
1097 | goto out_free_page; | |
1098 | ||
1099 | } | |
99f89551 | 1100 | length = audit_set_loginuid(current, loginuid); |
1da177e4 LT |
1101 | if (likely(length == 0)) |
1102 | length = count; | |
1103 | ||
1104 | out_free_page: | |
1105 | free_page((unsigned long) page); | |
1106 | return length; | |
1107 | } | |
1108 | ||
00977a59 | 1109 | static const struct file_operations proc_loginuid_operations = { |
1da177e4 LT |
1110 | .read = proc_loginuid_read, |
1111 | .write = proc_loginuid_write, | |
1112 | }; | |
1e0bd755 EP |
1113 | |
1114 | static ssize_t proc_sessionid_read(struct file * file, char __user * buf, | |
1115 | size_t count, loff_t *ppos) | |
1116 | { | |
1117 | struct inode * inode = file->f_path.dentry->d_inode; | |
1118 | struct task_struct *task = get_proc_task(inode); | |
1119 | ssize_t length; | |
1120 | char tmpbuf[TMPBUFLEN]; | |
1121 | ||
1122 | if (!task) | |
1123 | return -ESRCH; | |
1124 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", | |
1125 | audit_get_sessionid(task)); | |
1126 | put_task_struct(task); | |
1127 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
1128 | } | |
1129 | ||
1130 | static const struct file_operations proc_sessionid_operations = { | |
1131 | .read = proc_sessionid_read, | |
1132 | }; | |
1da177e4 LT |
1133 | #endif |
1134 | ||
f4f154fd AM |
1135 | #ifdef CONFIG_FAULT_INJECTION |
1136 | static ssize_t proc_fault_inject_read(struct file * file, char __user * buf, | |
1137 | size_t count, loff_t *ppos) | |
1138 | { | |
1139 | struct task_struct *task = get_proc_task(file->f_dentry->d_inode); | |
1140 | char buffer[PROC_NUMBUF]; | |
1141 | size_t len; | |
1142 | int make_it_fail; | |
f4f154fd AM |
1143 | |
1144 | if (!task) | |
1145 | return -ESRCH; | |
1146 | make_it_fail = task->make_it_fail; | |
1147 | put_task_struct(task); | |
1148 | ||
1149 | len = snprintf(buffer, sizeof(buffer), "%i\n", make_it_fail); | |
0c28f287 AM |
1150 | |
1151 | return simple_read_from_buffer(buf, count, ppos, buffer, len); | |
f4f154fd AM |
1152 | } |
1153 | ||
1154 | static ssize_t proc_fault_inject_write(struct file * file, | |
1155 | const char __user * buf, size_t count, loff_t *ppos) | |
1156 | { | |
1157 | struct task_struct *task; | |
1158 | char buffer[PROC_NUMBUF], *end; | |
1159 | int make_it_fail; | |
1160 | ||
1161 | if (!capable(CAP_SYS_RESOURCE)) | |
1162 | return -EPERM; | |
1163 | memset(buffer, 0, sizeof(buffer)); | |
1164 | if (count > sizeof(buffer) - 1) | |
1165 | count = sizeof(buffer) - 1; | |
1166 | if (copy_from_user(buffer, buf, count)) | |
1167 | return -EFAULT; | |
1168 | make_it_fail = simple_strtol(buffer, &end, 0); | |
1169 | if (*end == '\n') | |
1170 | end++; | |
1171 | task = get_proc_task(file->f_dentry->d_inode); | |
1172 | if (!task) | |
1173 | return -ESRCH; | |
1174 | task->make_it_fail = make_it_fail; | |
1175 | put_task_struct(task); | |
1176 | if (end - buffer == 0) | |
1177 | return -EIO; | |
1178 | return end - buffer; | |
1179 | } | |
1180 | ||
00977a59 | 1181 | static const struct file_operations proc_fault_inject_operations = { |
f4f154fd AM |
1182 | .read = proc_fault_inject_read, |
1183 | .write = proc_fault_inject_write, | |
1184 | }; | |
1185 | #endif | |
1186 | ||
9745512c | 1187 | |
43ae34cb IM |
1188 | #ifdef CONFIG_SCHED_DEBUG |
1189 | /* | |
1190 | * Print out various scheduling related per-task fields: | |
1191 | */ | |
1192 | static int sched_show(struct seq_file *m, void *v) | |
1193 | { | |
1194 | struct inode *inode = m->private; | |
1195 | struct task_struct *p; | |
1196 | ||
1197 | WARN_ON(!inode); | |
1198 | ||
1199 | p = get_proc_task(inode); | |
1200 | if (!p) | |
1201 | return -ESRCH; | |
1202 | proc_sched_show_task(p, m); | |
1203 | ||
1204 | put_task_struct(p); | |
1205 | ||
1206 | return 0; | |
1207 | } | |
1208 | ||
1209 | static ssize_t | |
1210 | sched_write(struct file *file, const char __user *buf, | |
1211 | size_t count, loff_t *offset) | |
1212 | { | |
1213 | struct inode *inode = file->f_path.dentry->d_inode; | |
1214 | struct task_struct *p; | |
1215 | ||
1216 | WARN_ON(!inode); | |
1217 | ||
1218 | p = get_proc_task(inode); | |
1219 | if (!p) | |
1220 | return -ESRCH; | |
1221 | proc_sched_set_task(p); | |
1222 | ||
1223 | put_task_struct(p); | |
1224 | ||
1225 | return count; | |
1226 | } | |
1227 | ||
1228 | static int sched_open(struct inode *inode, struct file *filp) | |
1229 | { | |
1230 | int ret; | |
1231 | ||
1232 | ret = single_open(filp, sched_show, NULL); | |
1233 | if (!ret) { | |
1234 | struct seq_file *m = filp->private_data; | |
1235 | ||
1236 | m->private = inode; | |
1237 | } | |
1238 | return ret; | |
1239 | } | |
1240 | ||
1241 | static const struct file_operations proc_pid_sched_operations = { | |
1242 | .open = sched_open, | |
1243 | .read = seq_read, | |
1244 | .write = sched_write, | |
1245 | .llseek = seq_lseek, | |
5ea473a1 | 1246 | .release = single_release, |
43ae34cb IM |
1247 | }; |
1248 | ||
1249 | #endif | |
1250 | ||
925d1c40 MH |
1251 | /* |
1252 | * We added or removed a vma mapping the executable. The vmas are only mapped | |
1253 | * during exec and are not mapped with the mmap system call. | |
1254 | * Callers must hold down_write() on the mm's mmap_sem for these | |
1255 | */ | |
1256 | void added_exe_file_vma(struct mm_struct *mm) | |
1257 | { | |
1258 | mm->num_exe_file_vmas++; | |
1259 | } | |
1260 | ||
1261 | void removed_exe_file_vma(struct mm_struct *mm) | |
1262 | { | |
1263 | mm->num_exe_file_vmas--; | |
1264 | if ((mm->num_exe_file_vmas == 0) && mm->exe_file){ | |
1265 | fput(mm->exe_file); | |
1266 | mm->exe_file = NULL; | |
1267 | } | |
1268 | ||
1269 | } | |
1270 | ||
1271 | void set_mm_exe_file(struct mm_struct *mm, struct file *new_exe_file) | |
1272 | { | |
1273 | if (new_exe_file) | |
1274 | get_file(new_exe_file); | |
1275 | if (mm->exe_file) | |
1276 | fput(mm->exe_file); | |
1277 | mm->exe_file = new_exe_file; | |
1278 | mm->num_exe_file_vmas = 0; | |
1279 | } | |
1280 | ||
1281 | struct file *get_mm_exe_file(struct mm_struct *mm) | |
1282 | { | |
1283 | struct file *exe_file; | |
1284 | ||
1285 | /* We need mmap_sem to protect against races with removal of | |
1286 | * VM_EXECUTABLE vmas */ | |
1287 | down_read(&mm->mmap_sem); | |
1288 | exe_file = mm->exe_file; | |
1289 | if (exe_file) | |
1290 | get_file(exe_file); | |
1291 | up_read(&mm->mmap_sem); | |
1292 | return exe_file; | |
1293 | } | |
1294 | ||
1295 | void dup_mm_exe_file(struct mm_struct *oldmm, struct mm_struct *newmm) | |
1296 | { | |
1297 | /* It's safe to write the exe_file pointer without exe_file_lock because | |
1298 | * this is called during fork when the task is not yet in /proc */ | |
1299 | newmm->exe_file = get_mm_exe_file(oldmm); | |
1300 | } | |
1301 | ||
1302 | static int proc_exe_link(struct inode *inode, struct path *exe_path) | |
1303 | { | |
1304 | struct task_struct *task; | |
1305 | struct mm_struct *mm; | |
1306 | struct file *exe_file; | |
1307 | ||
1308 | task = get_proc_task(inode); | |
1309 | if (!task) | |
1310 | return -ENOENT; | |
1311 | mm = get_task_mm(task); | |
1312 | put_task_struct(task); | |
1313 | if (!mm) | |
1314 | return -ENOENT; | |
1315 | exe_file = get_mm_exe_file(mm); | |
1316 | mmput(mm); | |
1317 | if (exe_file) { | |
1318 | *exe_path = exe_file->f_path; | |
1319 | path_get(&exe_file->f_path); | |
1320 | fput(exe_file); | |
1321 | return 0; | |
1322 | } else | |
1323 | return -ENOENT; | |
1324 | } | |
1325 | ||
008b150a | 1326 | static void *proc_pid_follow_link(struct dentry *dentry, struct nameidata *nd) |
1da177e4 LT |
1327 | { |
1328 | struct inode *inode = dentry->d_inode; | |
1329 | int error = -EACCES; | |
1330 | ||
1331 | /* We don't need a base pointer in the /proc filesystem */ | |
1d957f9b | 1332 | path_put(&nd->path); |
1da177e4 | 1333 | |
778c1144 EB |
1334 | /* Are we allowed to snoop on the tasks file descriptors? */ |
1335 | if (!proc_fd_access_allowed(inode)) | |
1da177e4 | 1336 | goto out; |
1da177e4 | 1337 | |
3dcd25f3 | 1338 | error = PROC_I(inode)->op.proc_get_link(inode, &nd->path); |
1da177e4 LT |
1339 | nd->last_type = LAST_BIND; |
1340 | out: | |
008b150a | 1341 | return ERR_PTR(error); |
1da177e4 LT |
1342 | } |
1343 | ||
3dcd25f3 | 1344 | static int do_proc_readlink(struct path *path, char __user *buffer, int buflen) |
1da177e4 | 1345 | { |
e12ba74d | 1346 | char *tmp = (char*)__get_free_page(GFP_TEMPORARY); |
3dcd25f3 | 1347 | char *pathname; |
1da177e4 LT |
1348 | int len; |
1349 | ||
1350 | if (!tmp) | |
1351 | return -ENOMEM; | |
0c28f287 | 1352 | |
cf28b486 | 1353 | pathname = d_path(path, tmp, PAGE_SIZE); |
3dcd25f3 JB |
1354 | len = PTR_ERR(pathname); |
1355 | if (IS_ERR(pathname)) | |
1da177e4 | 1356 | goto out; |
3dcd25f3 | 1357 | len = tmp + PAGE_SIZE - 1 - pathname; |
1da177e4 LT |
1358 | |
1359 | if (len > buflen) | |
1360 | len = buflen; | |
3dcd25f3 | 1361 | if (copy_to_user(buffer, pathname, len)) |
1da177e4 LT |
1362 | len = -EFAULT; |
1363 | out: | |
1364 | free_page((unsigned long)tmp); | |
1365 | return len; | |
1366 | } | |
1367 | ||
1368 | static int proc_pid_readlink(struct dentry * dentry, char __user * buffer, int buflen) | |
1369 | { | |
1370 | int error = -EACCES; | |
1371 | struct inode *inode = dentry->d_inode; | |
3dcd25f3 | 1372 | struct path path; |
1da177e4 | 1373 | |
778c1144 EB |
1374 | /* Are we allowed to snoop on the tasks file descriptors? */ |
1375 | if (!proc_fd_access_allowed(inode)) | |
1da177e4 | 1376 | goto out; |
1da177e4 | 1377 | |
3dcd25f3 | 1378 | error = PROC_I(inode)->op.proc_get_link(inode, &path); |
1da177e4 LT |
1379 | if (error) |
1380 | goto out; | |
1381 | ||
3dcd25f3 JB |
1382 | error = do_proc_readlink(&path, buffer, buflen); |
1383 | path_put(&path); | |
1da177e4 | 1384 | out: |
1da177e4 LT |
1385 | return error; |
1386 | } | |
1387 | ||
c5ef1c42 | 1388 | static const struct inode_operations proc_pid_link_inode_operations = { |
1da177e4 | 1389 | .readlink = proc_pid_readlink, |
6d76fa58 LT |
1390 | .follow_link = proc_pid_follow_link, |
1391 | .setattr = proc_setattr, | |
1da177e4 LT |
1392 | }; |
1393 | ||
28a6d671 EB |
1394 | |
1395 | /* building an inode */ | |
1396 | ||
1397 | static int task_dumpable(struct task_struct *task) | |
1da177e4 | 1398 | { |
28a6d671 EB |
1399 | int dumpable = 0; |
1400 | struct mm_struct *mm; | |
1da177e4 | 1401 | |
28a6d671 EB |
1402 | task_lock(task); |
1403 | mm = task->mm; | |
1404 | if (mm) | |
6c5d5238 | 1405 | dumpable = get_dumpable(mm); |
28a6d671 EB |
1406 | task_unlock(task); |
1407 | if(dumpable == 1) | |
1408 | return 1; | |
1409 | return 0; | |
1410 | } | |
1da177e4 | 1411 | |
1da177e4 | 1412 | |
61a28784 | 1413 | static struct inode *proc_pid_make_inode(struct super_block * sb, struct task_struct *task) |
28a6d671 EB |
1414 | { |
1415 | struct inode * inode; | |
1416 | struct proc_inode *ei; | |
1da177e4 | 1417 | |
28a6d671 | 1418 | /* We need a new inode */ |
1da177e4 | 1419 | |
28a6d671 EB |
1420 | inode = new_inode(sb); |
1421 | if (!inode) | |
1422 | goto out; | |
1423 | ||
1424 | /* Common stuff */ | |
1425 | ei = PROC_I(inode); | |
1426 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; | |
28a6d671 EB |
1427 | inode->i_op = &proc_def_inode_operations; |
1428 | ||
1429 | /* | |
1430 | * grab the reference to task. | |
1431 | */ | |
1a657f78 | 1432 | ei->pid = get_task_pid(task, PIDTYPE_PID); |
28a6d671 EB |
1433 | if (!ei->pid) |
1434 | goto out_unlock; | |
1435 | ||
1436 | inode->i_uid = 0; | |
1437 | inode->i_gid = 0; | |
1438 | if (task_dumpable(task)) { | |
1439 | inode->i_uid = task->euid; | |
1440 | inode->i_gid = task->egid; | |
1da177e4 | 1441 | } |
28a6d671 EB |
1442 | security_task_to_inode(task, inode); |
1443 | ||
1da177e4 | 1444 | out: |
28a6d671 EB |
1445 | return inode; |
1446 | ||
1447 | out_unlock: | |
1448 | iput(inode); | |
1449 | return NULL; | |
1da177e4 LT |
1450 | } |
1451 | ||
28a6d671 | 1452 | static int pid_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) |
1da177e4 | 1453 | { |
1da177e4 | 1454 | struct inode *inode = dentry->d_inode; |
28a6d671 EB |
1455 | struct task_struct *task; |
1456 | generic_fillattr(inode, stat); | |
1da177e4 | 1457 | |
28a6d671 EB |
1458 | rcu_read_lock(); |
1459 | stat->uid = 0; | |
1460 | stat->gid = 0; | |
1461 | task = pid_task(proc_pid(inode), PIDTYPE_PID); | |
1462 | if (task) { | |
1463 | if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) || | |
1464 | task_dumpable(task)) { | |
1465 | stat->uid = task->euid; | |
1466 | stat->gid = task->egid; | |
1da177e4 LT |
1467 | } |
1468 | } | |
28a6d671 | 1469 | rcu_read_unlock(); |
d6e71144 | 1470 | return 0; |
1da177e4 LT |
1471 | } |
1472 | ||
1da177e4 LT |
1473 | /* dentry stuff */ |
1474 | ||
1475 | /* | |
1476 | * Exceptional case: normally we are not allowed to unhash a busy | |
1477 | * directory. In this case, however, we can do it - no aliasing problems | |
1478 | * due to the way we treat inodes. | |
1479 | * | |
1480 | * Rewrite the inode's ownerships here because the owning task may have | |
1481 | * performed a setuid(), etc. | |
99f89551 EB |
1482 | * |
1483 | * Before the /proc/pid/status file was created the only way to read | |
1484 | * the effective uid of a /process was to stat /proc/pid. Reading | |
1485 | * /proc/pid/status is slow enough that procps and other packages | |
1486 | * kept stating /proc/pid. To keep the rules in /proc simple I have | |
1487 | * made this apply to all per process world readable and executable | |
1488 | * directories. | |
1da177e4 LT |
1489 | */ |
1490 | static int pid_revalidate(struct dentry *dentry, struct nameidata *nd) | |
1491 | { | |
1492 | struct inode *inode = dentry->d_inode; | |
99f89551 EB |
1493 | struct task_struct *task = get_proc_task(inode); |
1494 | if (task) { | |
1495 | if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) || | |
1496 | task_dumpable(task)) { | |
1da177e4 LT |
1497 | inode->i_uid = task->euid; |
1498 | inode->i_gid = task->egid; | |
1499 | } else { | |
1500 | inode->i_uid = 0; | |
1501 | inode->i_gid = 0; | |
1502 | } | |
9ee8ab9f | 1503 | inode->i_mode &= ~(S_ISUID | S_ISGID); |
1da177e4 | 1504 | security_task_to_inode(task, inode); |
99f89551 | 1505 | put_task_struct(task); |
1da177e4 LT |
1506 | return 1; |
1507 | } | |
1508 | d_drop(dentry); | |
1509 | return 0; | |
1510 | } | |
1511 | ||
28a6d671 | 1512 | static int pid_delete_dentry(struct dentry * dentry) |
99f89551 | 1513 | { |
28a6d671 EB |
1514 | /* Is the task we represent dead? |
1515 | * If so, then don't put the dentry on the lru list, | |
1516 | * kill it immediately. | |
1517 | */ | |
1518 | return !proc_pid(dentry->d_inode)->tasks[PIDTYPE_PID].first; | |
1519 | } | |
1520 | ||
1521 | static struct dentry_operations pid_dentry_operations = | |
1522 | { | |
1523 | .d_revalidate = pid_revalidate, | |
1524 | .d_delete = pid_delete_dentry, | |
1525 | }; | |
1526 | ||
1527 | /* Lookups */ | |
1528 | ||
c5141e6d ED |
1529 | typedef struct dentry *instantiate_t(struct inode *, struct dentry *, |
1530 | struct task_struct *, const void *); | |
61a28784 | 1531 | |
1c0d04c9 EB |
1532 | /* |
1533 | * Fill a directory entry. | |
1534 | * | |
1535 | * If possible create the dcache entry and derive our inode number and | |
1536 | * file type from dcache entry. | |
1537 | * | |
1538 | * Since all of the proc inode numbers are dynamically generated, the inode | |
1539 | * numbers do not exist until the inode is cache. This means creating the | |
1540 | * the dcache entry in readdir is necessary to keep the inode numbers | |
1541 | * reported by readdir in sync with the inode numbers reported | |
1542 | * by stat. | |
1543 | */ | |
61a28784 EB |
1544 | static int proc_fill_cache(struct file *filp, void *dirent, filldir_t filldir, |
1545 | char *name, int len, | |
c5141e6d | 1546 | instantiate_t instantiate, struct task_struct *task, const void *ptr) |
61a28784 | 1547 | { |
2fddfeef | 1548 | struct dentry *child, *dir = filp->f_path.dentry; |
61a28784 EB |
1549 | struct inode *inode; |
1550 | struct qstr qname; | |
1551 | ino_t ino = 0; | |
1552 | unsigned type = DT_UNKNOWN; | |
1553 | ||
1554 | qname.name = name; | |
1555 | qname.len = len; | |
1556 | qname.hash = full_name_hash(name, len); | |
1557 | ||
1558 | child = d_lookup(dir, &qname); | |
1559 | if (!child) { | |
1560 | struct dentry *new; | |
1561 | new = d_alloc(dir, &qname); | |
1562 | if (new) { | |
1563 | child = instantiate(dir->d_inode, new, task, ptr); | |
1564 | if (child) | |
1565 | dput(new); | |
1566 | else | |
1567 | child = new; | |
1568 | } | |
1569 | } | |
1570 | if (!child || IS_ERR(child) || !child->d_inode) | |
1571 | goto end_instantiate; | |
1572 | inode = child->d_inode; | |
1573 | if (inode) { | |
1574 | ino = inode->i_ino; | |
1575 | type = inode->i_mode >> 12; | |
1576 | } | |
1577 | dput(child); | |
1578 | end_instantiate: | |
1579 | if (!ino) | |
1580 | ino = find_inode_number(dir, &qname); | |
1581 | if (!ino) | |
1582 | ino = 1; | |
1583 | return filldir(dirent, name, len, filp->f_pos, ino, type); | |
1584 | } | |
1585 | ||
28a6d671 EB |
1586 | static unsigned name_to_int(struct dentry *dentry) |
1587 | { | |
1588 | const char *name = dentry->d_name.name; | |
1589 | int len = dentry->d_name.len; | |
1590 | unsigned n = 0; | |
1591 | ||
1592 | if (len > 1 && *name == '0') | |
1593 | goto out; | |
1594 | while (len-- > 0) { | |
1595 | unsigned c = *name++ - '0'; | |
1596 | if (c > 9) | |
1597 | goto out; | |
1598 | if (n >= (~0U-9)/10) | |
1599 | goto out; | |
1600 | n *= 10; | |
1601 | n += c; | |
1602 | } | |
1603 | return n; | |
1604 | out: | |
1605 | return ~0U; | |
1606 | } | |
1607 | ||
27932742 MS |
1608 | #define PROC_FDINFO_MAX 64 |
1609 | ||
3dcd25f3 | 1610 | static int proc_fd_info(struct inode *inode, struct path *path, char *info) |
28a6d671 EB |
1611 | { |
1612 | struct task_struct *task = get_proc_task(inode); | |
1613 | struct files_struct *files = NULL; | |
1614 | struct file *file; | |
1615 | int fd = proc_fd(inode); | |
99f89551 | 1616 | |
99f89551 | 1617 | if (task) { |
28a6d671 EB |
1618 | files = get_files_struct(task); |
1619 | put_task_struct(task); | |
1620 | } | |
1621 | if (files) { | |
1622 | /* | |
1623 | * We are not taking a ref to the file structure, so we must | |
1624 | * hold ->file_lock. | |
1625 | */ | |
1626 | spin_lock(&files->file_lock); | |
1627 | file = fcheck_files(files, fd); | |
1628 | if (file) { | |
3dcd25f3 JB |
1629 | if (path) { |
1630 | *path = file->f_path; | |
1631 | path_get(&file->f_path); | |
1632 | } | |
27932742 MS |
1633 | if (info) |
1634 | snprintf(info, PROC_FDINFO_MAX, | |
1635 | "pos:\t%lli\n" | |
1636 | "flags:\t0%o\n", | |
1637 | (long long) file->f_pos, | |
1638 | file->f_flags); | |
28a6d671 EB |
1639 | spin_unlock(&files->file_lock); |
1640 | put_files_struct(files); | |
1641 | return 0; | |
99f89551 | 1642 | } |
28a6d671 EB |
1643 | spin_unlock(&files->file_lock); |
1644 | put_files_struct(files); | |
99f89551 | 1645 | } |
28a6d671 | 1646 | return -ENOENT; |
99f89551 EB |
1647 | } |
1648 | ||
3dcd25f3 | 1649 | static int proc_fd_link(struct inode *inode, struct path *path) |
27932742 | 1650 | { |
3dcd25f3 | 1651 | return proc_fd_info(inode, path, NULL); |
27932742 MS |
1652 | } |
1653 | ||
1da177e4 LT |
1654 | static int tid_fd_revalidate(struct dentry *dentry, struct nameidata *nd) |
1655 | { | |
1656 | struct inode *inode = dentry->d_inode; | |
99f89551 | 1657 | struct task_struct *task = get_proc_task(inode); |
aed7a6c4 | 1658 | int fd = proc_fd(inode); |
1da177e4 LT |
1659 | struct files_struct *files; |
1660 | ||
99f89551 EB |
1661 | if (task) { |
1662 | files = get_files_struct(task); | |
1663 | if (files) { | |
1664 | rcu_read_lock(); | |
1665 | if (fcheck_files(files, fd)) { | |
1666 | rcu_read_unlock(); | |
1667 | put_files_struct(files); | |
1668 | if (task_dumpable(task)) { | |
1669 | inode->i_uid = task->euid; | |
1670 | inode->i_gid = task->egid; | |
1671 | } else { | |
1672 | inode->i_uid = 0; | |
1673 | inode->i_gid = 0; | |
1674 | } | |
9ee8ab9f | 1675 | inode->i_mode &= ~(S_ISUID | S_ISGID); |
99f89551 EB |
1676 | security_task_to_inode(task, inode); |
1677 | put_task_struct(task); | |
1678 | return 1; | |
1679 | } | |
b835996f | 1680 | rcu_read_unlock(); |
1da177e4 | 1681 | put_files_struct(files); |
1da177e4 | 1682 | } |
99f89551 | 1683 | put_task_struct(task); |
1da177e4 LT |
1684 | } |
1685 | d_drop(dentry); | |
1686 | return 0; | |
1687 | } | |
1688 | ||
1da177e4 LT |
1689 | static struct dentry_operations tid_fd_dentry_operations = |
1690 | { | |
1691 | .d_revalidate = tid_fd_revalidate, | |
1692 | .d_delete = pid_delete_dentry, | |
1693 | }; | |
1694 | ||
444ceed8 | 1695 | static struct dentry *proc_fd_instantiate(struct inode *dir, |
c5141e6d | 1696 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
1da177e4 | 1697 | { |
c5141e6d | 1698 | unsigned fd = *(const unsigned *)ptr; |
444ceed8 EB |
1699 | struct file *file; |
1700 | struct files_struct *files; | |
1701 | struct inode *inode; | |
1702 | struct proc_inode *ei; | |
1703 | struct dentry *error = ERR_PTR(-ENOENT); | |
1da177e4 | 1704 | |
61a28784 | 1705 | inode = proc_pid_make_inode(dir->i_sb, task); |
1da177e4 LT |
1706 | if (!inode) |
1707 | goto out; | |
1708 | ei = PROC_I(inode); | |
aed7a6c4 | 1709 | ei->fd = fd; |
1da177e4 LT |
1710 | files = get_files_struct(task); |
1711 | if (!files) | |
444ceed8 | 1712 | goto out_iput; |
1da177e4 | 1713 | inode->i_mode = S_IFLNK; |
ca99c1da DS |
1714 | |
1715 | /* | |
1716 | * We are not taking a ref to the file structure, so we must | |
1717 | * hold ->file_lock. | |
1718 | */ | |
1719 | spin_lock(&files->file_lock); | |
1da177e4 LT |
1720 | file = fcheck_files(files, fd); |
1721 | if (!file) | |
444ceed8 | 1722 | goto out_unlock; |
1da177e4 LT |
1723 | if (file->f_mode & 1) |
1724 | inode->i_mode |= S_IRUSR | S_IXUSR; | |
1725 | if (file->f_mode & 2) | |
1726 | inode->i_mode |= S_IWUSR | S_IXUSR; | |
ca99c1da | 1727 | spin_unlock(&files->file_lock); |
1da177e4 | 1728 | put_files_struct(files); |
444ceed8 | 1729 | |
1da177e4 LT |
1730 | inode->i_op = &proc_pid_link_inode_operations; |
1731 | inode->i_size = 64; | |
1732 | ei->op.proc_get_link = proc_fd_link; | |
1733 | dentry->d_op = &tid_fd_dentry_operations; | |
1734 | d_add(dentry, inode); | |
cd6a3ce9 EB |
1735 | /* Close the race of the process dying before we return the dentry */ |
1736 | if (tid_fd_revalidate(dentry, NULL)) | |
444ceed8 | 1737 | error = NULL; |
1da177e4 | 1738 | |
444ceed8 EB |
1739 | out: |
1740 | return error; | |
1741 | out_unlock: | |
ca99c1da | 1742 | spin_unlock(&files->file_lock); |
1da177e4 | 1743 | put_files_struct(files); |
444ceed8 | 1744 | out_iput: |
1da177e4 | 1745 | iput(inode); |
cd6a3ce9 | 1746 | goto out; |
1da177e4 LT |
1747 | } |
1748 | ||
27932742 MS |
1749 | static struct dentry *proc_lookupfd_common(struct inode *dir, |
1750 | struct dentry *dentry, | |
1751 | instantiate_t instantiate) | |
444ceed8 EB |
1752 | { |
1753 | struct task_struct *task = get_proc_task(dir); | |
1754 | unsigned fd = name_to_int(dentry); | |
1755 | struct dentry *result = ERR_PTR(-ENOENT); | |
1756 | ||
1757 | if (!task) | |
1758 | goto out_no_task; | |
1759 | if (fd == ~0U) | |
1760 | goto out; | |
1761 | ||
27932742 | 1762 | result = instantiate(dir, dentry, task, &fd); |
444ceed8 EB |
1763 | out: |
1764 | put_task_struct(task); | |
1765 | out_no_task: | |
1766 | return result; | |
1767 | } | |
1768 | ||
27932742 MS |
1769 | static int proc_readfd_common(struct file * filp, void * dirent, |
1770 | filldir_t filldir, instantiate_t instantiate) | |
28a6d671 | 1771 | { |
2fddfeef | 1772 | struct dentry *dentry = filp->f_path.dentry; |
28a6d671 EB |
1773 | struct inode *inode = dentry->d_inode; |
1774 | struct task_struct *p = get_proc_task(inode); | |
457c2510 | 1775 | unsigned int fd, ino; |
28a6d671 | 1776 | int retval; |
28a6d671 | 1777 | struct files_struct * files; |
1da177e4 | 1778 | |
28a6d671 EB |
1779 | retval = -ENOENT; |
1780 | if (!p) | |
1781 | goto out_no_task; | |
1782 | retval = 0; | |
28a6d671 EB |
1783 | |
1784 | fd = filp->f_pos; | |
1785 | switch (fd) { | |
1786 | case 0: | |
1787 | if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0) | |
1788 | goto out; | |
1789 | filp->f_pos++; | |
1790 | case 1: | |
1791 | ino = parent_ino(dentry); | |
1792 | if (filldir(dirent, "..", 2, 1, ino, DT_DIR) < 0) | |
1793 | goto out; | |
1794 | filp->f_pos++; | |
1795 | default: | |
1796 | files = get_files_struct(p); | |
1797 | if (!files) | |
1798 | goto out; | |
1799 | rcu_read_lock(); | |
28a6d671 | 1800 | for (fd = filp->f_pos-2; |
9b4f526c | 1801 | fd < files_fdtable(files)->max_fds; |
28a6d671 | 1802 | fd++, filp->f_pos++) { |
27932742 MS |
1803 | char name[PROC_NUMBUF]; |
1804 | int len; | |
28a6d671 EB |
1805 | |
1806 | if (!fcheck_files(files, fd)) | |
1807 | continue; | |
1808 | rcu_read_unlock(); | |
1809 | ||
27932742 MS |
1810 | len = snprintf(name, sizeof(name), "%d", fd); |
1811 | if (proc_fill_cache(filp, dirent, filldir, | |
1812 | name, len, instantiate, | |
1813 | p, &fd) < 0) { | |
28a6d671 EB |
1814 | rcu_read_lock(); |
1815 | break; | |
1816 | } | |
1817 | rcu_read_lock(); | |
1818 | } | |
1819 | rcu_read_unlock(); | |
1820 | put_files_struct(files); | |
1821 | } | |
1822 | out: | |
1823 | put_task_struct(p); | |
1824 | out_no_task: | |
1825 | return retval; | |
1826 | } | |
1827 | ||
27932742 MS |
1828 | static struct dentry *proc_lookupfd(struct inode *dir, struct dentry *dentry, |
1829 | struct nameidata *nd) | |
1830 | { | |
1831 | return proc_lookupfd_common(dir, dentry, proc_fd_instantiate); | |
1832 | } | |
1833 | ||
1834 | static int proc_readfd(struct file *filp, void *dirent, filldir_t filldir) | |
1835 | { | |
1836 | return proc_readfd_common(filp, dirent, filldir, proc_fd_instantiate); | |
1837 | } | |
1838 | ||
1839 | static ssize_t proc_fdinfo_read(struct file *file, char __user *buf, | |
1840 | size_t len, loff_t *ppos) | |
1841 | { | |
1842 | char tmp[PROC_FDINFO_MAX]; | |
3dcd25f3 | 1843 | int err = proc_fd_info(file->f_path.dentry->d_inode, NULL, tmp); |
27932742 MS |
1844 | if (!err) |
1845 | err = simple_read_from_buffer(buf, len, ppos, tmp, strlen(tmp)); | |
1846 | return err; | |
1847 | } | |
1848 | ||
1849 | static const struct file_operations proc_fdinfo_file_operations = { | |
1850 | .open = nonseekable_open, | |
1851 | .read = proc_fdinfo_read, | |
1852 | }; | |
1853 | ||
00977a59 | 1854 | static const struct file_operations proc_fd_operations = { |
28a6d671 EB |
1855 | .read = generic_read_dir, |
1856 | .readdir = proc_readfd, | |
1da177e4 LT |
1857 | }; |
1858 | ||
8948e11f AD |
1859 | /* |
1860 | * /proc/pid/fd needs a special permission handler so that a process can still | |
1861 | * access /proc/self/fd after it has executed a setuid(). | |
1862 | */ | |
e6305c43 | 1863 | static int proc_fd_permission(struct inode *inode, int mask) |
8948e11f AD |
1864 | { |
1865 | int rv; | |
1866 | ||
1867 | rv = generic_permission(inode, mask, NULL); | |
1868 | if (rv == 0) | |
1869 | return 0; | |
1870 | if (task_pid(current) == proc_pid(inode)) | |
1871 | rv = 0; | |
1872 | return rv; | |
1873 | } | |
1874 | ||
1da177e4 LT |
1875 | /* |
1876 | * proc directories can do almost nothing.. | |
1877 | */ | |
c5ef1c42 | 1878 | static const struct inode_operations proc_fd_inode_operations = { |
1da177e4 | 1879 | .lookup = proc_lookupfd, |
8948e11f | 1880 | .permission = proc_fd_permission, |
6d76fa58 | 1881 | .setattr = proc_setattr, |
1da177e4 LT |
1882 | }; |
1883 | ||
27932742 MS |
1884 | static struct dentry *proc_fdinfo_instantiate(struct inode *dir, |
1885 | struct dentry *dentry, struct task_struct *task, const void *ptr) | |
1886 | { | |
1887 | unsigned fd = *(unsigned *)ptr; | |
1888 | struct inode *inode; | |
1889 | struct proc_inode *ei; | |
1890 | struct dentry *error = ERR_PTR(-ENOENT); | |
1891 | ||
1892 | inode = proc_pid_make_inode(dir->i_sb, task); | |
1893 | if (!inode) | |
1894 | goto out; | |
1895 | ei = PROC_I(inode); | |
1896 | ei->fd = fd; | |
1897 | inode->i_mode = S_IFREG | S_IRUSR; | |
1898 | inode->i_fop = &proc_fdinfo_file_operations; | |
1899 | dentry->d_op = &tid_fd_dentry_operations; | |
1900 | d_add(dentry, inode); | |
1901 | /* Close the race of the process dying before we return the dentry */ | |
1902 | if (tid_fd_revalidate(dentry, NULL)) | |
1903 | error = NULL; | |
1904 | ||
1905 | out: | |
1906 | return error; | |
1907 | } | |
1908 | ||
1909 | static struct dentry *proc_lookupfdinfo(struct inode *dir, | |
1910 | struct dentry *dentry, | |
1911 | struct nameidata *nd) | |
1912 | { | |
1913 | return proc_lookupfd_common(dir, dentry, proc_fdinfo_instantiate); | |
1914 | } | |
1915 | ||
1916 | static int proc_readfdinfo(struct file *filp, void *dirent, filldir_t filldir) | |
1917 | { | |
1918 | return proc_readfd_common(filp, dirent, filldir, | |
1919 | proc_fdinfo_instantiate); | |
1920 | } | |
1921 | ||
1922 | static const struct file_operations proc_fdinfo_operations = { | |
1923 | .read = generic_read_dir, | |
1924 | .readdir = proc_readfdinfo, | |
1925 | }; | |
1926 | ||
1927 | /* | |
1928 | * proc directories can do almost nothing.. | |
1929 | */ | |
1930 | static const struct inode_operations proc_fdinfo_inode_operations = { | |
1931 | .lookup = proc_lookupfdinfo, | |
1932 | .setattr = proc_setattr, | |
1933 | }; | |
1934 | ||
1935 | ||
444ceed8 | 1936 | static struct dentry *proc_pident_instantiate(struct inode *dir, |
c5141e6d | 1937 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
444ceed8 | 1938 | { |
c5141e6d | 1939 | const struct pid_entry *p = ptr; |
444ceed8 EB |
1940 | struct inode *inode; |
1941 | struct proc_inode *ei; | |
1942 | struct dentry *error = ERR_PTR(-EINVAL); | |
1943 | ||
61a28784 | 1944 | inode = proc_pid_make_inode(dir->i_sb, task); |
444ceed8 EB |
1945 | if (!inode) |
1946 | goto out; | |
1947 | ||
1948 | ei = PROC_I(inode); | |
1949 | inode->i_mode = p->mode; | |
1950 | if (S_ISDIR(inode->i_mode)) | |
1951 | inode->i_nlink = 2; /* Use getattr to fix if necessary */ | |
1952 | if (p->iop) | |
1953 | inode->i_op = p->iop; | |
1954 | if (p->fop) | |
1955 | inode->i_fop = p->fop; | |
1956 | ei->op = p->op; | |
1957 | dentry->d_op = &pid_dentry_operations; | |
1958 | d_add(dentry, inode); | |
1959 | /* Close the race of the process dying before we return the dentry */ | |
1960 | if (pid_revalidate(dentry, NULL)) | |
1961 | error = NULL; | |
1962 | out: | |
1963 | return error; | |
1964 | } | |
1965 | ||
1da177e4 LT |
1966 | static struct dentry *proc_pident_lookup(struct inode *dir, |
1967 | struct dentry *dentry, | |
c5141e6d | 1968 | const struct pid_entry *ents, |
7bcd6b0e | 1969 | unsigned int nents) |
1da177e4 LT |
1970 | { |
1971 | struct inode *inode; | |
cd6a3ce9 | 1972 | struct dentry *error; |
99f89551 | 1973 | struct task_struct *task = get_proc_task(dir); |
c5141e6d | 1974 | const struct pid_entry *p, *last; |
1da177e4 | 1975 | |
cd6a3ce9 | 1976 | error = ERR_PTR(-ENOENT); |
1da177e4 LT |
1977 | inode = NULL; |
1978 | ||
99f89551 EB |
1979 | if (!task) |
1980 | goto out_no_task; | |
1da177e4 | 1981 | |
20cdc894 EB |
1982 | /* |
1983 | * Yes, it does not scale. And it should not. Don't add | |
1984 | * new entries into /proc/<tgid>/ without very good reasons. | |
1985 | */ | |
7bcd6b0e EB |
1986 | last = &ents[nents - 1]; |
1987 | for (p = ents; p <= last; p++) { | |
1da177e4 LT |
1988 | if (p->len != dentry->d_name.len) |
1989 | continue; | |
1990 | if (!memcmp(dentry->d_name.name, p->name, p->len)) | |
1991 | break; | |
1992 | } | |
7bcd6b0e | 1993 | if (p > last) |
1da177e4 LT |
1994 | goto out; |
1995 | ||
444ceed8 | 1996 | error = proc_pident_instantiate(dir, dentry, task, p); |
1da177e4 | 1997 | out: |
99f89551 EB |
1998 | put_task_struct(task); |
1999 | out_no_task: | |
cd6a3ce9 | 2000 | return error; |
1da177e4 LT |
2001 | } |
2002 | ||
c5141e6d ED |
2003 | static int proc_pident_fill_cache(struct file *filp, void *dirent, |
2004 | filldir_t filldir, struct task_struct *task, const struct pid_entry *p) | |
61a28784 EB |
2005 | { |
2006 | return proc_fill_cache(filp, dirent, filldir, p->name, p->len, | |
2007 | proc_pident_instantiate, task, p); | |
2008 | } | |
2009 | ||
28a6d671 EB |
2010 | static int proc_pident_readdir(struct file *filp, |
2011 | void *dirent, filldir_t filldir, | |
c5141e6d | 2012 | const struct pid_entry *ents, unsigned int nents) |
28a6d671 EB |
2013 | { |
2014 | int i; | |
2fddfeef | 2015 | struct dentry *dentry = filp->f_path.dentry; |
28a6d671 EB |
2016 | struct inode *inode = dentry->d_inode; |
2017 | struct task_struct *task = get_proc_task(inode); | |
c5141e6d | 2018 | const struct pid_entry *p, *last; |
28a6d671 EB |
2019 | ino_t ino; |
2020 | int ret; | |
2021 | ||
2022 | ret = -ENOENT; | |
2023 | if (!task) | |
61a28784 | 2024 | goto out_no_task; |
28a6d671 EB |
2025 | |
2026 | ret = 0; | |
28a6d671 EB |
2027 | i = filp->f_pos; |
2028 | switch (i) { | |
2029 | case 0: | |
2030 | ino = inode->i_ino; | |
2031 | if (filldir(dirent, ".", 1, i, ino, DT_DIR) < 0) | |
2032 | goto out; | |
2033 | i++; | |
2034 | filp->f_pos++; | |
2035 | /* fall through */ | |
2036 | case 1: | |
2037 | ino = parent_ino(dentry); | |
2038 | if (filldir(dirent, "..", 2, i, ino, DT_DIR) < 0) | |
2039 | goto out; | |
2040 | i++; | |
2041 | filp->f_pos++; | |
2042 | /* fall through */ | |
2043 | default: | |
2044 | i -= 2; | |
2045 | if (i >= nents) { | |
2046 | ret = 1; | |
2047 | goto out; | |
2048 | } | |
2049 | p = ents + i; | |
7bcd6b0e EB |
2050 | last = &ents[nents - 1]; |
2051 | while (p <= last) { | |
61a28784 | 2052 | if (proc_pident_fill_cache(filp, dirent, filldir, task, p) < 0) |
28a6d671 EB |
2053 | goto out; |
2054 | filp->f_pos++; | |
2055 | p++; | |
2056 | } | |
2057 | } | |
2058 | ||
2059 | ret = 1; | |
2060 | out: | |
61a28784 EB |
2061 | put_task_struct(task); |
2062 | out_no_task: | |
28a6d671 | 2063 | return ret; |
1da177e4 LT |
2064 | } |
2065 | ||
28a6d671 EB |
2066 | #ifdef CONFIG_SECURITY |
2067 | static ssize_t proc_pid_attr_read(struct file * file, char __user * buf, | |
2068 | size_t count, loff_t *ppos) | |
2069 | { | |
2fddfeef | 2070 | struct inode * inode = file->f_path.dentry->d_inode; |
04ff9708 | 2071 | char *p = NULL; |
28a6d671 EB |
2072 | ssize_t length; |
2073 | struct task_struct *task = get_proc_task(inode); | |
2074 | ||
28a6d671 | 2075 | if (!task) |
04ff9708 | 2076 | return -ESRCH; |
28a6d671 EB |
2077 | |
2078 | length = security_getprocattr(task, | |
2fddfeef | 2079 | (char*)file->f_path.dentry->d_name.name, |
04ff9708 | 2080 | &p); |
28a6d671 | 2081 | put_task_struct(task); |
04ff9708 AV |
2082 | if (length > 0) |
2083 | length = simple_read_from_buffer(buf, count, ppos, p, length); | |
2084 | kfree(p); | |
28a6d671 | 2085 | return length; |
1da177e4 LT |
2086 | } |
2087 | ||
28a6d671 EB |
2088 | static ssize_t proc_pid_attr_write(struct file * file, const char __user * buf, |
2089 | size_t count, loff_t *ppos) | |
2090 | { | |
2fddfeef | 2091 | struct inode * inode = file->f_path.dentry->d_inode; |
28a6d671 EB |
2092 | char *page; |
2093 | ssize_t length; | |
2094 | struct task_struct *task = get_proc_task(inode); | |
2095 | ||
2096 | length = -ESRCH; | |
2097 | if (!task) | |
2098 | goto out_no_task; | |
2099 | if (count > PAGE_SIZE) | |
2100 | count = PAGE_SIZE; | |
2101 | ||
2102 | /* No partial writes. */ | |
2103 | length = -EINVAL; | |
2104 | if (*ppos != 0) | |
2105 | goto out; | |
2106 | ||
2107 | length = -ENOMEM; | |
e12ba74d | 2108 | page = (char*)__get_free_page(GFP_TEMPORARY); |
28a6d671 EB |
2109 | if (!page) |
2110 | goto out; | |
2111 | ||
2112 | length = -EFAULT; | |
2113 | if (copy_from_user(page, buf, count)) | |
2114 | goto out_free; | |
2115 | ||
2116 | length = security_setprocattr(task, | |
2fddfeef | 2117 | (char*)file->f_path.dentry->d_name.name, |
28a6d671 EB |
2118 | (void*)page, count); |
2119 | out_free: | |
2120 | free_page((unsigned long) page); | |
2121 | out: | |
2122 | put_task_struct(task); | |
2123 | out_no_task: | |
2124 | return length; | |
2125 | } | |
2126 | ||
00977a59 | 2127 | static const struct file_operations proc_pid_attr_operations = { |
28a6d671 EB |
2128 | .read = proc_pid_attr_read, |
2129 | .write = proc_pid_attr_write, | |
2130 | }; | |
2131 | ||
c5141e6d | 2132 | static const struct pid_entry attr_dir_stuff[] = { |
61a28784 EB |
2133 | REG("current", S_IRUGO|S_IWUGO, pid_attr), |
2134 | REG("prev", S_IRUGO, pid_attr), | |
2135 | REG("exec", S_IRUGO|S_IWUGO, pid_attr), | |
2136 | REG("fscreate", S_IRUGO|S_IWUGO, pid_attr), | |
2137 | REG("keycreate", S_IRUGO|S_IWUGO, pid_attr), | |
2138 | REG("sockcreate", S_IRUGO|S_IWUGO, pid_attr), | |
28a6d671 EB |
2139 | }; |
2140 | ||
72d9dcfc | 2141 | static int proc_attr_dir_readdir(struct file * filp, |
28a6d671 EB |
2142 | void * dirent, filldir_t filldir) |
2143 | { | |
2144 | return proc_pident_readdir(filp,dirent,filldir, | |
72d9dcfc | 2145 | attr_dir_stuff,ARRAY_SIZE(attr_dir_stuff)); |
28a6d671 EB |
2146 | } |
2147 | ||
00977a59 | 2148 | static const struct file_operations proc_attr_dir_operations = { |
1da177e4 | 2149 | .read = generic_read_dir, |
72d9dcfc | 2150 | .readdir = proc_attr_dir_readdir, |
1da177e4 LT |
2151 | }; |
2152 | ||
72d9dcfc | 2153 | static struct dentry *proc_attr_dir_lookup(struct inode *dir, |
28a6d671 EB |
2154 | struct dentry *dentry, struct nameidata *nd) |
2155 | { | |
7bcd6b0e EB |
2156 | return proc_pident_lookup(dir, dentry, |
2157 | attr_dir_stuff, ARRAY_SIZE(attr_dir_stuff)); | |
28a6d671 EB |
2158 | } |
2159 | ||
c5ef1c42 | 2160 | static const struct inode_operations proc_attr_dir_inode_operations = { |
72d9dcfc | 2161 | .lookup = proc_attr_dir_lookup, |
99f89551 | 2162 | .getattr = pid_getattr, |
6d76fa58 | 2163 | .setattr = proc_setattr, |
1da177e4 LT |
2164 | }; |
2165 | ||
28a6d671 EB |
2166 | #endif |
2167 | ||
3cb4a0bb KH |
2168 | #if defined(USE_ELF_CORE_DUMP) && defined(CONFIG_ELF_CORE) |
2169 | static ssize_t proc_coredump_filter_read(struct file *file, char __user *buf, | |
2170 | size_t count, loff_t *ppos) | |
2171 | { | |
2172 | struct task_struct *task = get_proc_task(file->f_dentry->d_inode); | |
2173 | struct mm_struct *mm; | |
2174 | char buffer[PROC_NUMBUF]; | |
2175 | size_t len; | |
2176 | int ret; | |
2177 | ||
2178 | if (!task) | |
2179 | return -ESRCH; | |
2180 | ||
2181 | ret = 0; | |
2182 | mm = get_task_mm(task); | |
2183 | if (mm) { | |
2184 | len = snprintf(buffer, sizeof(buffer), "%08lx\n", | |
2185 | ((mm->flags & MMF_DUMP_FILTER_MASK) >> | |
2186 | MMF_DUMP_FILTER_SHIFT)); | |
2187 | mmput(mm); | |
2188 | ret = simple_read_from_buffer(buf, count, ppos, buffer, len); | |
2189 | } | |
2190 | ||
2191 | put_task_struct(task); | |
2192 | ||
2193 | return ret; | |
2194 | } | |
2195 | ||
2196 | static ssize_t proc_coredump_filter_write(struct file *file, | |
2197 | const char __user *buf, | |
2198 | size_t count, | |
2199 | loff_t *ppos) | |
2200 | { | |
2201 | struct task_struct *task; | |
2202 | struct mm_struct *mm; | |
2203 | char buffer[PROC_NUMBUF], *end; | |
2204 | unsigned int val; | |
2205 | int ret; | |
2206 | int i; | |
2207 | unsigned long mask; | |
2208 | ||
2209 | ret = -EFAULT; | |
2210 | memset(buffer, 0, sizeof(buffer)); | |
2211 | if (count > sizeof(buffer) - 1) | |
2212 | count = sizeof(buffer) - 1; | |
2213 | if (copy_from_user(buffer, buf, count)) | |
2214 | goto out_no_task; | |
2215 | ||
2216 | ret = -EINVAL; | |
2217 | val = (unsigned int)simple_strtoul(buffer, &end, 0); | |
2218 | if (*end == '\n') | |
2219 | end++; | |
2220 | if (end - buffer == 0) | |
2221 | goto out_no_task; | |
2222 | ||
2223 | ret = -ESRCH; | |
2224 | task = get_proc_task(file->f_dentry->d_inode); | |
2225 | if (!task) | |
2226 | goto out_no_task; | |
2227 | ||
2228 | ret = end - buffer; | |
2229 | mm = get_task_mm(task); | |
2230 | if (!mm) | |
2231 | goto out_no_mm; | |
2232 | ||
2233 | for (i = 0, mask = 1; i < MMF_DUMP_FILTER_BITS; i++, mask <<= 1) { | |
2234 | if (val & mask) | |
2235 | set_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags); | |
2236 | else | |
2237 | clear_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags); | |
2238 | } | |
2239 | ||
2240 | mmput(mm); | |
2241 | out_no_mm: | |
2242 | put_task_struct(task); | |
2243 | out_no_task: | |
2244 | return ret; | |
2245 | } | |
2246 | ||
2247 | static const struct file_operations proc_coredump_filter_operations = { | |
2248 | .read = proc_coredump_filter_read, | |
2249 | .write = proc_coredump_filter_write, | |
2250 | }; | |
2251 | #endif | |
2252 | ||
28a6d671 EB |
2253 | /* |
2254 | * /proc/self: | |
2255 | */ | |
2256 | static int proc_self_readlink(struct dentry *dentry, char __user *buffer, | |
2257 | int buflen) | |
2258 | { | |
488e5bc4 | 2259 | struct pid_namespace *ns = dentry->d_sb->s_fs_info; |
b55fcb22 | 2260 | pid_t tgid = task_tgid_nr_ns(current, ns); |
28a6d671 | 2261 | char tmp[PROC_NUMBUF]; |
b55fcb22 | 2262 | if (!tgid) |
488e5bc4 | 2263 | return -ENOENT; |
b55fcb22 | 2264 | sprintf(tmp, "%d", tgid); |
28a6d671 EB |
2265 | return vfs_readlink(dentry,buffer,buflen,tmp); |
2266 | } | |
2267 | ||
2268 | static void *proc_self_follow_link(struct dentry *dentry, struct nameidata *nd) | |
2269 | { | |
488e5bc4 | 2270 | struct pid_namespace *ns = dentry->d_sb->s_fs_info; |
b55fcb22 | 2271 | pid_t tgid = task_tgid_nr_ns(current, ns); |
28a6d671 | 2272 | char tmp[PROC_NUMBUF]; |
b55fcb22 | 2273 | if (!tgid) |
488e5bc4 | 2274 | return ERR_PTR(-ENOENT); |
b55fcb22 | 2275 | sprintf(tmp, "%d", task_tgid_nr_ns(current, ns)); |
28a6d671 EB |
2276 | return ERR_PTR(vfs_follow_link(nd,tmp)); |
2277 | } | |
2278 | ||
c5ef1c42 | 2279 | static const struct inode_operations proc_self_inode_operations = { |
28a6d671 EB |
2280 | .readlink = proc_self_readlink, |
2281 | .follow_link = proc_self_follow_link, | |
2282 | }; | |
2283 | ||
801199ce EB |
2284 | /* |
2285 | * proc base | |
2286 | * | |
2287 | * These are the directory entries in the root directory of /proc | |
2288 | * that properly belong to the /proc filesystem, as they describe | |
2289 | * describe something that is process related. | |
2290 | */ | |
c5141e6d | 2291 | static const struct pid_entry proc_base_stuff[] = { |
61a28784 | 2292 | NOD("self", S_IFLNK|S_IRWXUGO, |
801199ce | 2293 | &proc_self_inode_operations, NULL, {}), |
801199ce EB |
2294 | }; |
2295 | ||
2296 | /* | |
2297 | * Exceptional case: normally we are not allowed to unhash a busy | |
2298 | * directory. In this case, however, we can do it - no aliasing problems | |
2299 | * due to the way we treat inodes. | |
2300 | */ | |
2301 | static int proc_base_revalidate(struct dentry *dentry, struct nameidata *nd) | |
2302 | { | |
2303 | struct inode *inode = dentry->d_inode; | |
2304 | struct task_struct *task = get_proc_task(inode); | |
2305 | if (task) { | |
2306 | put_task_struct(task); | |
2307 | return 1; | |
2308 | } | |
2309 | d_drop(dentry); | |
2310 | return 0; | |
2311 | } | |
2312 | ||
2313 | static struct dentry_operations proc_base_dentry_operations = | |
2314 | { | |
2315 | .d_revalidate = proc_base_revalidate, | |
2316 | .d_delete = pid_delete_dentry, | |
2317 | }; | |
2318 | ||
444ceed8 | 2319 | static struct dentry *proc_base_instantiate(struct inode *dir, |
c5141e6d | 2320 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
801199ce | 2321 | { |
c5141e6d | 2322 | const struct pid_entry *p = ptr; |
801199ce | 2323 | struct inode *inode; |
801199ce | 2324 | struct proc_inode *ei; |
444ceed8 | 2325 | struct dentry *error = ERR_PTR(-EINVAL); |
801199ce EB |
2326 | |
2327 | /* Allocate the inode */ | |
2328 | error = ERR_PTR(-ENOMEM); | |
2329 | inode = new_inode(dir->i_sb); | |
2330 | if (!inode) | |
2331 | goto out; | |
2332 | ||
2333 | /* Initialize the inode */ | |
2334 | ei = PROC_I(inode); | |
2335 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; | |
801199ce EB |
2336 | |
2337 | /* | |
2338 | * grab the reference to the task. | |
2339 | */ | |
1a657f78 | 2340 | ei->pid = get_task_pid(task, PIDTYPE_PID); |
801199ce EB |
2341 | if (!ei->pid) |
2342 | goto out_iput; | |
2343 | ||
2344 | inode->i_uid = 0; | |
2345 | inode->i_gid = 0; | |
2346 | inode->i_mode = p->mode; | |
2347 | if (S_ISDIR(inode->i_mode)) | |
2348 | inode->i_nlink = 2; | |
2349 | if (S_ISLNK(inode->i_mode)) | |
2350 | inode->i_size = 64; | |
2351 | if (p->iop) | |
2352 | inode->i_op = p->iop; | |
2353 | if (p->fop) | |
2354 | inode->i_fop = p->fop; | |
2355 | ei->op = p->op; | |
2356 | dentry->d_op = &proc_base_dentry_operations; | |
2357 | d_add(dentry, inode); | |
2358 | error = NULL; | |
2359 | out: | |
801199ce EB |
2360 | return error; |
2361 | out_iput: | |
2362 | iput(inode); | |
2363 | goto out; | |
2364 | } | |
2365 | ||
444ceed8 EB |
2366 | static struct dentry *proc_base_lookup(struct inode *dir, struct dentry *dentry) |
2367 | { | |
2368 | struct dentry *error; | |
2369 | struct task_struct *task = get_proc_task(dir); | |
c5141e6d | 2370 | const struct pid_entry *p, *last; |
444ceed8 EB |
2371 | |
2372 | error = ERR_PTR(-ENOENT); | |
2373 | ||
2374 | if (!task) | |
2375 | goto out_no_task; | |
2376 | ||
2377 | /* Lookup the directory entry */ | |
7bcd6b0e EB |
2378 | last = &proc_base_stuff[ARRAY_SIZE(proc_base_stuff) - 1]; |
2379 | for (p = proc_base_stuff; p <= last; p++) { | |
444ceed8 EB |
2380 | if (p->len != dentry->d_name.len) |
2381 | continue; | |
2382 | if (!memcmp(dentry->d_name.name, p->name, p->len)) | |
2383 | break; | |
2384 | } | |
7bcd6b0e | 2385 | if (p > last) |
444ceed8 EB |
2386 | goto out; |
2387 | ||
2388 | error = proc_base_instantiate(dir, dentry, task, p); | |
2389 | ||
2390 | out: | |
2391 | put_task_struct(task); | |
2392 | out_no_task: | |
2393 | return error; | |
2394 | } | |
2395 | ||
c5141e6d ED |
2396 | static int proc_base_fill_cache(struct file *filp, void *dirent, |
2397 | filldir_t filldir, struct task_struct *task, const struct pid_entry *p) | |
61a28784 EB |
2398 | { |
2399 | return proc_fill_cache(filp, dirent, filldir, p->name, p->len, | |
2400 | proc_base_instantiate, task, p); | |
2401 | } | |
2402 | ||
aba76fdb | 2403 | #ifdef CONFIG_TASK_IO_ACCOUNTING |
297c5d92 AR |
2404 | static int do_io_accounting(struct task_struct *task, char *buffer, int whole) |
2405 | { | |
5995477a AR |
2406 | struct proc_io_accounting acct = task->ioac; |
2407 | unsigned long flags; | |
2408 | ||
2409 | if (whole && lock_task_sighand(task, &flags)) { | |
2410 | struct task_struct *t = task; | |
2411 | ||
2412 | task_io_accounting_add(&acct, &task->signal->ioac); | |
2413 | while_each_thread(task, t) | |
2414 | task_io_accounting_add(&acct, &t->ioac); | |
2415 | ||
2416 | unlock_task_sighand(task, &flags); | |
297c5d92 | 2417 | } |
aba76fdb AM |
2418 | return sprintf(buffer, |
2419 | "rchar: %llu\n" | |
2420 | "wchar: %llu\n" | |
2421 | "syscr: %llu\n" | |
2422 | "syscw: %llu\n" | |
2423 | "read_bytes: %llu\n" | |
2424 | "write_bytes: %llu\n" | |
2425 | "cancelled_write_bytes: %llu\n", | |
5995477a AR |
2426 | acct.chr.rchar, acct.chr.wchar, |
2427 | acct.chr.syscr, acct.chr.syscw, | |
2428 | acct.blk.read_bytes, acct.blk.write_bytes, | |
2429 | acct.blk.cancelled_write_bytes); | |
297c5d92 AR |
2430 | } |
2431 | ||
2432 | static int proc_tid_io_accounting(struct task_struct *task, char *buffer) | |
2433 | { | |
2434 | return do_io_accounting(task, buffer, 0); | |
aba76fdb | 2435 | } |
297c5d92 AR |
2436 | |
2437 | static int proc_tgid_io_accounting(struct task_struct *task, char *buffer) | |
2438 | { | |
2439 | return do_io_accounting(task, buffer, 1); | |
2440 | } | |
2441 | #endif /* CONFIG_TASK_IO_ACCOUNTING */ | |
aba76fdb | 2442 | |
28a6d671 EB |
2443 | /* |
2444 | * Thread groups | |
2445 | */ | |
00977a59 | 2446 | static const struct file_operations proc_task_operations; |
c5ef1c42 | 2447 | static const struct inode_operations proc_task_inode_operations; |
20cdc894 | 2448 | |
c5141e6d | 2449 | static const struct pid_entry tgid_base_stuff[] = { |
61a28784 EB |
2450 | DIR("task", S_IRUGO|S_IXUGO, task), |
2451 | DIR("fd", S_IRUSR|S_IXUSR, fd), | |
27932742 | 2452 | DIR("fdinfo", S_IRUSR|S_IXUSR, fdinfo), |
b2211a36 | 2453 | #ifdef CONFIG_NET |
4f42c288 | 2454 | DIR("net", S_IRUGO|S_IXUGO, net), |
b2211a36 | 2455 | #endif |
315e28c8 | 2456 | REG("environ", S_IRUSR, environ), |
61a28784 | 2457 | INF("auxv", S_IRUSR, pid_auxv), |
df5f8314 | 2458 | ONE("status", S_IRUGO, pid_status), |
d85f50d5 | 2459 | INF("limits", S_IRUSR, pid_limits), |
43ae34cb IM |
2460 | #ifdef CONFIG_SCHED_DEBUG |
2461 | REG("sched", S_IRUGO|S_IWUSR, pid_sched), | |
ebcb6734 RM |
2462 | #endif |
2463 | #ifdef CONFIG_HAVE_ARCH_TRACEHOOK | |
2464 | INF("syscall", S_IRUSR, pid_syscall), | |
43ae34cb | 2465 | #endif |
61a28784 | 2466 | INF("cmdline", S_IRUGO, pid_cmdline), |
ee992744 | 2467 | ONE("stat", S_IRUGO, tgid_stat), |
a56d3fc7 | 2468 | ONE("statm", S_IRUGO, pid_statm), |
61a28784 | 2469 | REG("maps", S_IRUGO, maps), |
28a6d671 | 2470 | #ifdef CONFIG_NUMA |
61a28784 | 2471 | REG("numa_maps", S_IRUGO, numa_maps), |
28a6d671 | 2472 | #endif |
61a28784 | 2473 | REG("mem", S_IRUSR|S_IWUSR, mem), |
61a28784 EB |
2474 | LNK("cwd", cwd), |
2475 | LNK("root", root), | |
2476 | LNK("exe", exe), | |
2477 | REG("mounts", S_IRUGO, mounts), | |
2d4d4864 | 2478 | REG("mountinfo", S_IRUGO, mountinfo), |
61a28784 | 2479 | REG("mountstats", S_IRUSR, mountstats), |
1e883281 | 2480 | #ifdef CONFIG_PROC_PAGE_MONITOR |
b813e931 | 2481 | REG("clear_refs", S_IWUSR, clear_refs), |
61a28784 | 2482 | REG("smaps", S_IRUGO, smaps), |
85863e47 | 2483 | REG("pagemap", S_IRUSR, pagemap), |
28a6d671 EB |
2484 | #endif |
2485 | #ifdef CONFIG_SECURITY | |
72d9dcfc | 2486 | DIR("attr", S_IRUGO|S_IXUGO, attr_dir), |
28a6d671 EB |
2487 | #endif |
2488 | #ifdef CONFIG_KALLSYMS | |
61a28784 | 2489 | INF("wchan", S_IRUGO, pid_wchan), |
28a6d671 EB |
2490 | #endif |
2491 | #ifdef CONFIG_SCHEDSTATS | |
61a28784 | 2492 | INF("schedstat", S_IRUGO, pid_schedstat), |
28a6d671 | 2493 | #endif |
9745512c AV |
2494 | #ifdef CONFIG_LATENCYTOP |
2495 | REG("latency", S_IRUGO, lstats), | |
2496 | #endif | |
8793d854 | 2497 | #ifdef CONFIG_PROC_PID_CPUSET |
61a28784 | 2498 | REG("cpuset", S_IRUGO, cpuset), |
a424316c PM |
2499 | #endif |
2500 | #ifdef CONFIG_CGROUPS | |
2501 | REG("cgroup", S_IRUGO, cgroup), | |
28a6d671 | 2502 | #endif |
61a28784 EB |
2503 | INF("oom_score", S_IRUGO, oom_score), |
2504 | REG("oom_adj", S_IRUGO|S_IWUSR, oom_adjust), | |
28a6d671 | 2505 | #ifdef CONFIG_AUDITSYSCALL |
61a28784 | 2506 | REG("loginuid", S_IWUSR|S_IRUGO, loginuid), |
6ee65046 | 2507 | REG("sessionid", S_IRUGO, sessionid), |
28a6d671 | 2508 | #endif |
f4f154fd AM |
2509 | #ifdef CONFIG_FAULT_INJECTION |
2510 | REG("make-it-fail", S_IRUGO|S_IWUSR, fault_inject), | |
2511 | #endif | |
3cb4a0bb KH |
2512 | #if defined(USE_ELF_CORE_DUMP) && defined(CONFIG_ELF_CORE) |
2513 | REG("coredump_filter", S_IRUGO|S_IWUSR, coredump_filter), | |
2514 | #endif | |
aba76fdb | 2515 | #ifdef CONFIG_TASK_IO_ACCOUNTING |
297c5d92 | 2516 | INF("io", S_IRUGO, tgid_io_accounting), |
aba76fdb | 2517 | #endif |
28a6d671 | 2518 | }; |
1da177e4 | 2519 | |
28a6d671 | 2520 | static int proc_tgid_base_readdir(struct file * filp, |
1da177e4 LT |
2521 | void * dirent, filldir_t filldir) |
2522 | { | |
2523 | return proc_pident_readdir(filp,dirent,filldir, | |
28a6d671 | 2524 | tgid_base_stuff,ARRAY_SIZE(tgid_base_stuff)); |
1da177e4 LT |
2525 | } |
2526 | ||
00977a59 | 2527 | static const struct file_operations proc_tgid_base_operations = { |
1da177e4 | 2528 | .read = generic_read_dir, |
28a6d671 | 2529 | .readdir = proc_tgid_base_readdir, |
1da177e4 LT |
2530 | }; |
2531 | ||
28a6d671 | 2532 | static struct dentry *proc_tgid_base_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd){ |
7bcd6b0e EB |
2533 | return proc_pident_lookup(dir, dentry, |
2534 | tgid_base_stuff, ARRAY_SIZE(tgid_base_stuff)); | |
1da177e4 LT |
2535 | } |
2536 | ||
c5ef1c42 | 2537 | static const struct inode_operations proc_tgid_base_inode_operations = { |
28a6d671 | 2538 | .lookup = proc_tgid_base_lookup, |
99f89551 | 2539 | .getattr = pid_getattr, |
6d76fa58 | 2540 | .setattr = proc_setattr, |
1da177e4 | 2541 | }; |
1da177e4 | 2542 | |
60347f67 | 2543 | static void proc_flush_task_mnt(struct vfsmount *mnt, pid_t pid, pid_t tgid) |
1da177e4 | 2544 | { |
48e6484d | 2545 | struct dentry *dentry, *leader, *dir; |
8578cea7 | 2546 | char buf[PROC_NUMBUF]; |
48e6484d EB |
2547 | struct qstr name; |
2548 | ||
2549 | name.name = buf; | |
60347f67 PE |
2550 | name.len = snprintf(buf, sizeof(buf), "%d", pid); |
2551 | dentry = d_hash_and_lookup(mnt->mnt_root, &name); | |
48e6484d | 2552 | if (dentry) { |
7766755a AA |
2553 | if (!(current->flags & PF_EXITING)) |
2554 | shrink_dcache_parent(dentry); | |
48e6484d EB |
2555 | d_drop(dentry); |
2556 | dput(dentry); | |
2557 | } | |
1da177e4 | 2558 | |
60347f67 | 2559 | if (tgid == 0) |
48e6484d | 2560 | goto out; |
1da177e4 | 2561 | |
48e6484d | 2562 | name.name = buf; |
60347f67 PE |
2563 | name.len = snprintf(buf, sizeof(buf), "%d", tgid); |
2564 | leader = d_hash_and_lookup(mnt->mnt_root, &name); | |
48e6484d EB |
2565 | if (!leader) |
2566 | goto out; | |
1da177e4 | 2567 | |
48e6484d EB |
2568 | name.name = "task"; |
2569 | name.len = strlen(name.name); | |
2570 | dir = d_hash_and_lookup(leader, &name); | |
2571 | if (!dir) | |
2572 | goto out_put_leader; | |
2573 | ||
2574 | name.name = buf; | |
60347f67 | 2575 | name.len = snprintf(buf, sizeof(buf), "%d", pid); |
48e6484d EB |
2576 | dentry = d_hash_and_lookup(dir, &name); |
2577 | if (dentry) { | |
2578 | shrink_dcache_parent(dentry); | |
2579 | d_drop(dentry); | |
2580 | dput(dentry); | |
1da177e4 | 2581 | } |
48e6484d EB |
2582 | |
2583 | dput(dir); | |
2584 | out_put_leader: | |
2585 | dput(leader); | |
2586 | out: | |
2587 | return; | |
1da177e4 LT |
2588 | } |
2589 | ||
0895e91d RD |
2590 | /** |
2591 | * proc_flush_task - Remove dcache entries for @task from the /proc dcache. | |
2592 | * @task: task that should be flushed. | |
2593 | * | |
2594 | * When flushing dentries from proc, one needs to flush them from global | |
60347f67 | 2595 | * proc (proc_mnt) and from all the namespaces' procs this task was seen |
0895e91d RD |
2596 | * in. This call is supposed to do all of this job. |
2597 | * | |
2598 | * Looks in the dcache for | |
2599 | * /proc/@pid | |
2600 | * /proc/@tgid/task/@pid | |
2601 | * if either directory is present flushes it and all of it'ts children | |
2602 | * from the dcache. | |
2603 | * | |
2604 | * It is safe and reasonable to cache /proc entries for a task until | |
2605 | * that task exits. After that they just clog up the dcache with | |
2606 | * useless entries, possibly causing useful dcache entries to be | |
2607 | * flushed instead. This routine is proved to flush those useless | |
2608 | * dcache entries at process exit time. | |
2609 | * | |
2610 | * NOTE: This routine is just an optimization so it does not guarantee | |
2611 | * that no dcache entries will exist at process exit time it | |
2612 | * just makes it very unlikely that any will persist. | |
60347f67 PE |
2613 | */ |
2614 | ||
2615 | void proc_flush_task(struct task_struct *task) | |
2616 | { | |
9fcc2d15 EB |
2617 | int i; |
2618 | struct pid *pid, *tgid = NULL; | |
130f77ec PE |
2619 | struct upid *upid; |
2620 | ||
130f77ec | 2621 | pid = task_pid(task); |
9fcc2d15 EB |
2622 | if (thread_group_leader(task)) |
2623 | tgid = task_tgid(task); | |
130f77ec | 2624 | |
9fcc2d15 | 2625 | for (i = 0; i <= pid->level; i++) { |
130f77ec PE |
2626 | upid = &pid->numbers[i]; |
2627 | proc_flush_task_mnt(upid->ns->proc_mnt, upid->nr, | |
9fcc2d15 | 2628 | tgid ? tgid->numbers[i].nr : 0); |
130f77ec | 2629 | } |
6f4e6433 PE |
2630 | |
2631 | upid = &pid->numbers[pid->level]; | |
2632 | if (upid->nr == 1) | |
2633 | pid_ns_release_proc(upid->ns); | |
60347f67 PE |
2634 | } |
2635 | ||
9711ef99 AB |
2636 | static struct dentry *proc_pid_instantiate(struct inode *dir, |
2637 | struct dentry * dentry, | |
c5141e6d | 2638 | struct task_struct *task, const void *ptr) |
444ceed8 EB |
2639 | { |
2640 | struct dentry *error = ERR_PTR(-ENOENT); | |
2641 | struct inode *inode; | |
2642 | ||
61a28784 | 2643 | inode = proc_pid_make_inode(dir->i_sb, task); |
444ceed8 EB |
2644 | if (!inode) |
2645 | goto out; | |
2646 | ||
2647 | inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO; | |
2648 | inode->i_op = &proc_tgid_base_inode_operations; | |
2649 | inode->i_fop = &proc_tgid_base_operations; | |
2650 | inode->i_flags|=S_IMMUTABLE; | |
aed54175 VN |
2651 | |
2652 | inode->i_nlink = 2 + pid_entry_count_dirs(tgid_base_stuff, | |
2653 | ARRAY_SIZE(tgid_base_stuff)); | |
444ceed8 EB |
2654 | |
2655 | dentry->d_op = &pid_dentry_operations; | |
2656 | ||
2657 | d_add(dentry, inode); | |
2658 | /* Close the race of the process dying before we return the dentry */ | |
2659 | if (pid_revalidate(dentry, NULL)) | |
2660 | error = NULL; | |
2661 | out: | |
2662 | return error; | |
2663 | } | |
2664 | ||
1da177e4 LT |
2665 | struct dentry *proc_pid_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd) |
2666 | { | |
cd6a3ce9 | 2667 | struct dentry *result = ERR_PTR(-ENOENT); |
1da177e4 | 2668 | struct task_struct *task; |
1da177e4 | 2669 | unsigned tgid; |
b488893a | 2670 | struct pid_namespace *ns; |
1da177e4 | 2671 | |
801199ce EB |
2672 | result = proc_base_lookup(dir, dentry); |
2673 | if (!IS_ERR(result) || PTR_ERR(result) != -ENOENT) | |
2674 | goto out; | |
2675 | ||
1da177e4 LT |
2676 | tgid = name_to_int(dentry); |
2677 | if (tgid == ~0U) | |
2678 | goto out; | |
2679 | ||
b488893a | 2680 | ns = dentry->d_sb->s_fs_info; |
de758734 | 2681 | rcu_read_lock(); |
b488893a | 2682 | task = find_task_by_pid_ns(tgid, ns); |
1da177e4 LT |
2683 | if (task) |
2684 | get_task_struct(task); | |
de758734 | 2685 | rcu_read_unlock(); |
1da177e4 LT |
2686 | if (!task) |
2687 | goto out; | |
2688 | ||
444ceed8 | 2689 | result = proc_pid_instantiate(dir, dentry, task, NULL); |
1da177e4 | 2690 | put_task_struct(task); |
1da177e4 | 2691 | out: |
cd6a3ce9 | 2692 | return result; |
1da177e4 LT |
2693 | } |
2694 | ||
1da177e4 | 2695 | /* |
0804ef4b | 2696 | * Find the first task with tgid >= tgid |
0bc58a91 | 2697 | * |
1da177e4 | 2698 | */ |
19fd4bb2 EB |
2699 | struct tgid_iter { |
2700 | unsigned int tgid; | |
0804ef4b | 2701 | struct task_struct *task; |
19fd4bb2 EB |
2702 | }; |
2703 | static struct tgid_iter next_tgid(struct pid_namespace *ns, struct tgid_iter iter) | |
2704 | { | |
0804ef4b | 2705 | struct pid *pid; |
1da177e4 | 2706 | |
19fd4bb2 EB |
2707 | if (iter.task) |
2708 | put_task_struct(iter.task); | |
454cc105 | 2709 | rcu_read_lock(); |
0804ef4b | 2710 | retry: |
19fd4bb2 EB |
2711 | iter.task = NULL; |
2712 | pid = find_ge_pid(iter.tgid, ns); | |
0804ef4b | 2713 | if (pid) { |
19fd4bb2 EB |
2714 | iter.tgid = pid_nr_ns(pid, ns); |
2715 | iter.task = pid_task(pid, PIDTYPE_PID); | |
0804ef4b EB |
2716 | /* What we to know is if the pid we have find is the |
2717 | * pid of a thread_group_leader. Testing for task | |
2718 | * being a thread_group_leader is the obvious thing | |
2719 | * todo but there is a window when it fails, due to | |
2720 | * the pid transfer logic in de_thread. | |
2721 | * | |
2722 | * So we perform the straight forward test of seeing | |
2723 | * if the pid we have found is the pid of a thread | |
2724 | * group leader, and don't worry if the task we have | |
2725 | * found doesn't happen to be a thread group leader. | |
2726 | * As we don't care in the case of readdir. | |
2727 | */ | |
19fd4bb2 EB |
2728 | if (!iter.task || !has_group_leader_pid(iter.task)) { |
2729 | iter.tgid += 1; | |
0804ef4b | 2730 | goto retry; |
19fd4bb2 EB |
2731 | } |
2732 | get_task_struct(iter.task); | |
0bc58a91 | 2733 | } |
454cc105 | 2734 | rcu_read_unlock(); |
19fd4bb2 | 2735 | return iter; |
1da177e4 LT |
2736 | } |
2737 | ||
7bcd6b0e | 2738 | #define TGID_OFFSET (FIRST_PROCESS_ENTRY + ARRAY_SIZE(proc_base_stuff)) |
0804ef4b | 2739 | |
61a28784 | 2740 | static int proc_pid_fill_cache(struct file *filp, void *dirent, filldir_t filldir, |
19fd4bb2 | 2741 | struct tgid_iter iter) |
61a28784 EB |
2742 | { |
2743 | char name[PROC_NUMBUF]; | |
19fd4bb2 | 2744 | int len = snprintf(name, sizeof(name), "%d", iter.tgid); |
61a28784 | 2745 | return proc_fill_cache(filp, dirent, filldir, name, len, |
19fd4bb2 | 2746 | proc_pid_instantiate, iter.task, NULL); |
61a28784 EB |
2747 | } |
2748 | ||
1da177e4 LT |
2749 | /* for the /proc/ directory itself, after non-process stuff has been done */ |
2750 | int proc_pid_readdir(struct file * filp, void * dirent, filldir_t filldir) | |
2751 | { | |
1da177e4 | 2752 | unsigned int nr = filp->f_pos - FIRST_PROCESS_ENTRY; |
2fddfeef | 2753 | struct task_struct *reaper = get_proc_task(filp->f_path.dentry->d_inode); |
19fd4bb2 | 2754 | struct tgid_iter iter; |
b488893a | 2755 | struct pid_namespace *ns; |
1da177e4 | 2756 | |
61a28784 EB |
2757 | if (!reaper) |
2758 | goto out_no_task; | |
2759 | ||
7bcd6b0e | 2760 | for (; nr < ARRAY_SIZE(proc_base_stuff); filp->f_pos++, nr++) { |
c5141e6d | 2761 | const struct pid_entry *p = &proc_base_stuff[nr]; |
61a28784 | 2762 | if (proc_base_fill_cache(filp, dirent, filldir, reaper, p) < 0) |
801199ce | 2763 | goto out; |
1da177e4 LT |
2764 | } |
2765 | ||
b488893a | 2766 | ns = filp->f_dentry->d_sb->s_fs_info; |
19fd4bb2 EB |
2767 | iter.task = NULL; |
2768 | iter.tgid = filp->f_pos - TGID_OFFSET; | |
2769 | for (iter = next_tgid(ns, iter); | |
2770 | iter.task; | |
2771 | iter.tgid += 1, iter = next_tgid(ns, iter)) { | |
2772 | filp->f_pos = iter.tgid + TGID_OFFSET; | |
2773 | if (proc_pid_fill_cache(filp, dirent, filldir, iter) < 0) { | |
2774 | put_task_struct(iter.task); | |
0804ef4b | 2775 | goto out; |
1da177e4 | 2776 | } |
0bc58a91 | 2777 | } |
0804ef4b EB |
2778 | filp->f_pos = PID_MAX_LIMIT + TGID_OFFSET; |
2779 | out: | |
61a28784 EB |
2780 | put_task_struct(reaper); |
2781 | out_no_task: | |
0bc58a91 EB |
2782 | return 0; |
2783 | } | |
1da177e4 | 2784 | |
28a6d671 EB |
2785 | /* |
2786 | * Tasks | |
2787 | */ | |
c5141e6d | 2788 | static const struct pid_entry tid_base_stuff[] = { |
61a28784 | 2789 | DIR("fd", S_IRUSR|S_IXUSR, fd), |
27932742 | 2790 | DIR("fdinfo", S_IRUSR|S_IXUSR, fdinfo), |
315e28c8 | 2791 | REG("environ", S_IRUSR, environ), |
61a28784 | 2792 | INF("auxv", S_IRUSR, pid_auxv), |
df5f8314 | 2793 | ONE("status", S_IRUGO, pid_status), |
d85f50d5 | 2794 | INF("limits", S_IRUSR, pid_limits), |
43ae34cb IM |
2795 | #ifdef CONFIG_SCHED_DEBUG |
2796 | REG("sched", S_IRUGO|S_IWUSR, pid_sched), | |
ebcb6734 RM |
2797 | #endif |
2798 | #ifdef CONFIG_HAVE_ARCH_TRACEHOOK | |
2799 | INF("syscall", S_IRUSR, pid_syscall), | |
43ae34cb | 2800 | #endif |
61a28784 | 2801 | INF("cmdline", S_IRUGO, pid_cmdline), |
ee992744 | 2802 | ONE("stat", S_IRUGO, tid_stat), |
a56d3fc7 | 2803 | ONE("statm", S_IRUGO, pid_statm), |
61a28784 | 2804 | REG("maps", S_IRUGO, maps), |
28a6d671 | 2805 | #ifdef CONFIG_NUMA |
61a28784 | 2806 | REG("numa_maps", S_IRUGO, numa_maps), |
28a6d671 | 2807 | #endif |
61a28784 | 2808 | REG("mem", S_IRUSR|S_IWUSR, mem), |
61a28784 EB |
2809 | LNK("cwd", cwd), |
2810 | LNK("root", root), | |
2811 | LNK("exe", exe), | |
2812 | REG("mounts", S_IRUGO, mounts), | |
2d4d4864 | 2813 | REG("mountinfo", S_IRUGO, mountinfo), |
1e883281 | 2814 | #ifdef CONFIG_PROC_PAGE_MONITOR |
b813e931 | 2815 | REG("clear_refs", S_IWUSR, clear_refs), |
61a28784 | 2816 | REG("smaps", S_IRUGO, smaps), |
85863e47 | 2817 | REG("pagemap", S_IRUSR, pagemap), |
28a6d671 EB |
2818 | #endif |
2819 | #ifdef CONFIG_SECURITY | |
72d9dcfc | 2820 | DIR("attr", S_IRUGO|S_IXUGO, attr_dir), |
28a6d671 EB |
2821 | #endif |
2822 | #ifdef CONFIG_KALLSYMS | |
61a28784 | 2823 | INF("wchan", S_IRUGO, pid_wchan), |
28a6d671 EB |
2824 | #endif |
2825 | #ifdef CONFIG_SCHEDSTATS | |
61a28784 | 2826 | INF("schedstat", S_IRUGO, pid_schedstat), |
28a6d671 | 2827 | #endif |
9745512c AV |
2828 | #ifdef CONFIG_LATENCYTOP |
2829 | REG("latency", S_IRUGO, lstats), | |
2830 | #endif | |
8793d854 | 2831 | #ifdef CONFIG_PROC_PID_CPUSET |
61a28784 | 2832 | REG("cpuset", S_IRUGO, cpuset), |
a424316c PM |
2833 | #endif |
2834 | #ifdef CONFIG_CGROUPS | |
2835 | REG("cgroup", S_IRUGO, cgroup), | |
28a6d671 | 2836 | #endif |
61a28784 EB |
2837 | INF("oom_score", S_IRUGO, oom_score), |
2838 | REG("oom_adj", S_IRUGO|S_IWUSR, oom_adjust), | |
28a6d671 | 2839 | #ifdef CONFIG_AUDITSYSCALL |
61a28784 | 2840 | REG("loginuid", S_IWUSR|S_IRUGO, loginuid), |
1e0bd755 | 2841 | REG("sessionid", S_IRUSR, sessionid), |
28a6d671 | 2842 | #endif |
f4f154fd AM |
2843 | #ifdef CONFIG_FAULT_INJECTION |
2844 | REG("make-it-fail", S_IRUGO|S_IWUSR, fault_inject), | |
2845 | #endif | |
297c5d92 AR |
2846 | #ifdef CONFIG_TASK_IO_ACCOUNTING |
2847 | INF("io", S_IRUGO, tid_io_accounting), | |
2848 | #endif | |
28a6d671 EB |
2849 | }; |
2850 | ||
2851 | static int proc_tid_base_readdir(struct file * filp, | |
2852 | void * dirent, filldir_t filldir) | |
2853 | { | |
2854 | return proc_pident_readdir(filp,dirent,filldir, | |
2855 | tid_base_stuff,ARRAY_SIZE(tid_base_stuff)); | |
2856 | } | |
2857 | ||
2858 | static struct dentry *proc_tid_base_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd){ | |
7bcd6b0e EB |
2859 | return proc_pident_lookup(dir, dentry, |
2860 | tid_base_stuff, ARRAY_SIZE(tid_base_stuff)); | |
28a6d671 EB |
2861 | } |
2862 | ||
00977a59 | 2863 | static const struct file_operations proc_tid_base_operations = { |
28a6d671 EB |
2864 | .read = generic_read_dir, |
2865 | .readdir = proc_tid_base_readdir, | |
2866 | }; | |
2867 | ||
c5ef1c42 | 2868 | static const struct inode_operations proc_tid_base_inode_operations = { |
28a6d671 EB |
2869 | .lookup = proc_tid_base_lookup, |
2870 | .getattr = pid_getattr, | |
2871 | .setattr = proc_setattr, | |
2872 | }; | |
2873 | ||
444ceed8 | 2874 | static struct dentry *proc_task_instantiate(struct inode *dir, |
c5141e6d | 2875 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
444ceed8 EB |
2876 | { |
2877 | struct dentry *error = ERR_PTR(-ENOENT); | |
2878 | struct inode *inode; | |
61a28784 | 2879 | inode = proc_pid_make_inode(dir->i_sb, task); |
444ceed8 EB |
2880 | |
2881 | if (!inode) | |
2882 | goto out; | |
2883 | inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO; | |
2884 | inode->i_op = &proc_tid_base_inode_operations; | |
2885 | inode->i_fop = &proc_tid_base_operations; | |
2886 | inode->i_flags|=S_IMMUTABLE; | |
aed54175 VN |
2887 | |
2888 | inode->i_nlink = 2 + pid_entry_count_dirs(tid_base_stuff, | |
2889 | ARRAY_SIZE(tid_base_stuff)); | |
444ceed8 EB |
2890 | |
2891 | dentry->d_op = &pid_dentry_operations; | |
2892 | ||
2893 | d_add(dentry, inode); | |
2894 | /* Close the race of the process dying before we return the dentry */ | |
2895 | if (pid_revalidate(dentry, NULL)) | |
2896 | error = NULL; | |
2897 | out: | |
2898 | return error; | |
2899 | } | |
2900 | ||
28a6d671 EB |
2901 | static struct dentry *proc_task_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd) |
2902 | { | |
2903 | struct dentry *result = ERR_PTR(-ENOENT); | |
2904 | struct task_struct *task; | |
2905 | struct task_struct *leader = get_proc_task(dir); | |
28a6d671 | 2906 | unsigned tid; |
b488893a | 2907 | struct pid_namespace *ns; |
28a6d671 EB |
2908 | |
2909 | if (!leader) | |
2910 | goto out_no_task; | |
2911 | ||
2912 | tid = name_to_int(dentry); | |
2913 | if (tid == ~0U) | |
2914 | goto out; | |
2915 | ||
b488893a | 2916 | ns = dentry->d_sb->s_fs_info; |
28a6d671 | 2917 | rcu_read_lock(); |
b488893a | 2918 | task = find_task_by_pid_ns(tid, ns); |
28a6d671 EB |
2919 | if (task) |
2920 | get_task_struct(task); | |
2921 | rcu_read_unlock(); | |
2922 | if (!task) | |
2923 | goto out; | |
bac0abd6 | 2924 | if (!same_thread_group(leader, task)) |
28a6d671 EB |
2925 | goto out_drop_task; |
2926 | ||
444ceed8 | 2927 | result = proc_task_instantiate(dir, dentry, task, NULL); |
28a6d671 EB |
2928 | out_drop_task: |
2929 | put_task_struct(task); | |
2930 | out: | |
2931 | put_task_struct(leader); | |
2932 | out_no_task: | |
2933 | return result; | |
2934 | } | |
2935 | ||
0bc58a91 EB |
2936 | /* |
2937 | * Find the first tid of a thread group to return to user space. | |
2938 | * | |
2939 | * Usually this is just the thread group leader, but if the users | |
2940 | * buffer was too small or there was a seek into the middle of the | |
2941 | * directory we have more work todo. | |
2942 | * | |
2943 | * In the case of a short read we start with find_task_by_pid. | |
2944 | * | |
2945 | * In the case of a seek we start with the leader and walk nr | |
2946 | * threads past it. | |
2947 | */ | |
cc288738 | 2948 | static struct task_struct *first_tid(struct task_struct *leader, |
b488893a | 2949 | int tid, int nr, struct pid_namespace *ns) |
0bc58a91 | 2950 | { |
a872ff0c | 2951 | struct task_struct *pos; |
1da177e4 | 2952 | |
cc288738 | 2953 | rcu_read_lock(); |
0bc58a91 EB |
2954 | /* Attempt to start with the pid of a thread */ |
2955 | if (tid && (nr > 0)) { | |
b488893a | 2956 | pos = find_task_by_pid_ns(tid, ns); |
a872ff0c ON |
2957 | if (pos && (pos->group_leader == leader)) |
2958 | goto found; | |
0bc58a91 | 2959 | } |
1da177e4 | 2960 | |
0bc58a91 | 2961 | /* If nr exceeds the number of threads there is nothing todo */ |
a872ff0c ON |
2962 | pos = NULL; |
2963 | if (nr && nr >= get_nr_threads(leader)) | |
2964 | goto out; | |
1da177e4 | 2965 | |
a872ff0c ON |
2966 | /* If we haven't found our starting place yet start |
2967 | * with the leader and walk nr threads forward. | |
0bc58a91 | 2968 | */ |
a872ff0c ON |
2969 | for (pos = leader; nr > 0; --nr) { |
2970 | pos = next_thread(pos); | |
2971 | if (pos == leader) { | |
2972 | pos = NULL; | |
2973 | goto out; | |
2974 | } | |
1da177e4 | 2975 | } |
a872ff0c ON |
2976 | found: |
2977 | get_task_struct(pos); | |
2978 | out: | |
cc288738 | 2979 | rcu_read_unlock(); |
0bc58a91 EB |
2980 | return pos; |
2981 | } | |
2982 | ||
2983 | /* | |
2984 | * Find the next thread in the thread list. | |
2985 | * Return NULL if there is an error or no next thread. | |
2986 | * | |
2987 | * The reference to the input task_struct is released. | |
2988 | */ | |
2989 | static struct task_struct *next_tid(struct task_struct *start) | |
2990 | { | |
c1df7fb8 | 2991 | struct task_struct *pos = NULL; |
cc288738 | 2992 | rcu_read_lock(); |
c1df7fb8 | 2993 | if (pid_alive(start)) { |
0bc58a91 | 2994 | pos = next_thread(start); |
c1df7fb8 ON |
2995 | if (thread_group_leader(pos)) |
2996 | pos = NULL; | |
2997 | else | |
2998 | get_task_struct(pos); | |
2999 | } | |
cc288738 | 3000 | rcu_read_unlock(); |
0bc58a91 EB |
3001 | put_task_struct(start); |
3002 | return pos; | |
1da177e4 LT |
3003 | } |
3004 | ||
61a28784 EB |
3005 | static int proc_task_fill_cache(struct file *filp, void *dirent, filldir_t filldir, |
3006 | struct task_struct *task, int tid) | |
3007 | { | |
3008 | char name[PROC_NUMBUF]; | |
3009 | int len = snprintf(name, sizeof(name), "%d", tid); | |
3010 | return proc_fill_cache(filp, dirent, filldir, name, len, | |
3011 | proc_task_instantiate, task, NULL); | |
3012 | } | |
3013 | ||
1da177e4 LT |
3014 | /* for the /proc/TGID/task/ directories */ |
3015 | static int proc_task_readdir(struct file * filp, void * dirent, filldir_t filldir) | |
3016 | { | |
2fddfeef | 3017 | struct dentry *dentry = filp->f_path.dentry; |
1da177e4 | 3018 | struct inode *inode = dentry->d_inode; |
7d895244 | 3019 | struct task_struct *leader = NULL; |
0bc58a91 | 3020 | struct task_struct *task; |
1da177e4 LT |
3021 | int retval = -ENOENT; |
3022 | ino_t ino; | |
0bc58a91 | 3023 | int tid; |
1da177e4 | 3024 | unsigned long pos = filp->f_pos; /* avoiding "long long" filp->f_pos */ |
b488893a | 3025 | struct pid_namespace *ns; |
1da177e4 | 3026 | |
7d895244 GC |
3027 | task = get_proc_task(inode); |
3028 | if (!task) | |
3029 | goto out_no_task; | |
3030 | rcu_read_lock(); | |
3031 | if (pid_alive(task)) { | |
3032 | leader = task->group_leader; | |
3033 | get_task_struct(leader); | |
3034 | } | |
3035 | rcu_read_unlock(); | |
3036 | put_task_struct(task); | |
99f89551 EB |
3037 | if (!leader) |
3038 | goto out_no_task; | |
1da177e4 LT |
3039 | retval = 0; |
3040 | ||
3041 | switch (pos) { | |
3042 | case 0: | |
3043 | ino = inode->i_ino; | |
3044 | if (filldir(dirent, ".", 1, pos, ino, DT_DIR) < 0) | |
3045 | goto out; | |
3046 | pos++; | |
3047 | /* fall through */ | |
3048 | case 1: | |
3049 | ino = parent_ino(dentry); | |
3050 | if (filldir(dirent, "..", 2, pos, ino, DT_DIR) < 0) | |
3051 | goto out; | |
3052 | pos++; | |
3053 | /* fall through */ | |
3054 | } | |
3055 | ||
0bc58a91 EB |
3056 | /* f_version caches the tgid value that the last readdir call couldn't |
3057 | * return. lseek aka telldir automagically resets f_version to 0. | |
3058 | */ | |
b488893a | 3059 | ns = filp->f_dentry->d_sb->s_fs_info; |
2b47c361 | 3060 | tid = (int)filp->f_version; |
0bc58a91 | 3061 | filp->f_version = 0; |
b488893a | 3062 | for (task = first_tid(leader, tid, pos - 2, ns); |
0bc58a91 EB |
3063 | task; |
3064 | task = next_tid(task), pos++) { | |
b488893a | 3065 | tid = task_pid_nr_ns(task, ns); |
61a28784 | 3066 | if (proc_task_fill_cache(filp, dirent, filldir, task, tid) < 0) { |
0bc58a91 EB |
3067 | /* returning this tgid failed, save it as the first |
3068 | * pid for the next readir call */ | |
2b47c361 | 3069 | filp->f_version = (u64)tid; |
0bc58a91 | 3070 | put_task_struct(task); |
1da177e4 | 3071 | break; |
0bc58a91 | 3072 | } |
1da177e4 LT |
3073 | } |
3074 | out: | |
3075 | filp->f_pos = pos; | |
99f89551 EB |
3076 | put_task_struct(leader); |
3077 | out_no_task: | |
1da177e4 LT |
3078 | return retval; |
3079 | } | |
6e66b52b EB |
3080 | |
3081 | static int proc_task_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) | |
3082 | { | |
3083 | struct inode *inode = dentry->d_inode; | |
99f89551 | 3084 | struct task_struct *p = get_proc_task(inode); |
6e66b52b EB |
3085 | generic_fillattr(inode, stat); |
3086 | ||
99f89551 EB |
3087 | if (p) { |
3088 | rcu_read_lock(); | |
3089 | stat->nlink += get_nr_threads(p); | |
3090 | rcu_read_unlock(); | |
3091 | put_task_struct(p); | |
6e66b52b EB |
3092 | } |
3093 | ||
3094 | return 0; | |
3095 | } | |
28a6d671 | 3096 | |
c5ef1c42 | 3097 | static const struct inode_operations proc_task_inode_operations = { |
28a6d671 EB |
3098 | .lookup = proc_task_lookup, |
3099 | .getattr = proc_task_getattr, | |
3100 | .setattr = proc_setattr, | |
3101 | }; | |
3102 | ||
00977a59 | 3103 | static const struct file_operations proc_task_operations = { |
28a6d671 EB |
3104 | .read = generic_read_dir, |
3105 | .readdir = proc_task_readdir, | |
3106 | }; |