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 | ||
0494f6ec | 151 | static struct fs_struct *get_fs_struct(struct task_struct *task) |
1da177e4 LT |
152 | { |
153 | struct fs_struct *fs; | |
0494f6ec MS |
154 | task_lock(task); |
155 | fs = task->fs; | |
1da177e4 LT |
156 | if(fs) |
157 | atomic_inc(&fs->count); | |
0494f6ec MS |
158 | task_unlock(task); |
159 | return fs; | |
160 | } | |
161 | ||
99f89551 EB |
162 | static int get_nr_threads(struct task_struct *tsk) |
163 | { | |
99f89551 EB |
164 | unsigned long flags; |
165 | int count = 0; | |
166 | ||
167 | if (lock_task_sighand(tsk, &flags)) { | |
168 | count = atomic_read(&tsk->signal->count); | |
169 | unlock_task_sighand(tsk, &flags); | |
170 | } | |
171 | return count; | |
172 | } | |
173 | ||
3dcd25f3 | 174 | static int proc_cwd_link(struct inode *inode, struct path *path) |
0494f6ec | 175 | { |
99f89551 EB |
176 | struct task_struct *task = get_proc_task(inode); |
177 | struct fs_struct *fs = NULL; | |
0494f6ec | 178 | int result = -ENOENT; |
99f89551 EB |
179 | |
180 | if (task) { | |
181 | fs = get_fs_struct(task); | |
182 | put_task_struct(task); | |
183 | } | |
1da177e4 LT |
184 | if (fs) { |
185 | read_lock(&fs->lock); | |
3dcd25f3 JB |
186 | *path = fs->pwd; |
187 | path_get(&fs->pwd); | |
1da177e4 LT |
188 | read_unlock(&fs->lock); |
189 | result = 0; | |
190 | put_fs_struct(fs); | |
191 | } | |
192 | return result; | |
193 | } | |
194 | ||
3dcd25f3 | 195 | static int proc_root_link(struct inode *inode, struct path *path) |
1da177e4 | 196 | { |
99f89551 EB |
197 | struct task_struct *task = get_proc_task(inode); |
198 | struct fs_struct *fs = NULL; | |
1da177e4 | 199 | int result = -ENOENT; |
99f89551 EB |
200 | |
201 | if (task) { | |
202 | fs = get_fs_struct(task); | |
203 | put_task_struct(task); | |
204 | } | |
1da177e4 LT |
205 | if (fs) { |
206 | read_lock(&fs->lock); | |
3dcd25f3 JB |
207 | *path = fs->root; |
208 | path_get(&fs->root); | |
1da177e4 LT |
209 | read_unlock(&fs->lock); |
210 | result = 0; | |
211 | put_fs_struct(fs); | |
212 | } | |
213 | return result; | |
214 | } | |
215 | ||
638fa202 RM |
216 | /* |
217 | * Return zero if current may access user memory in @task, -error if not. | |
218 | */ | |
219 | static int check_mem_permission(struct task_struct *task) | |
220 | { | |
221 | /* | |
222 | * A task can always look at itself, in case it chooses | |
223 | * to use system calls instead of load instructions. | |
224 | */ | |
225 | if (task == current) | |
226 | return 0; | |
227 | ||
228 | /* | |
229 | * If current is actively ptrace'ing, and would also be | |
230 | * permitted to freshly attach with ptrace now, permit it. | |
231 | */ | |
0d094efe RM |
232 | if (task_is_stopped_or_traced(task)) { |
233 | int match; | |
234 | rcu_read_lock(); | |
235 | match = (tracehook_tracer_task(task) == current); | |
236 | rcu_read_unlock(); | |
237 | if (match && ptrace_may_access(task, PTRACE_MODE_ATTACH)) | |
238 | return 0; | |
239 | } | |
638fa202 RM |
240 | |
241 | /* | |
242 | * Noone else is allowed. | |
243 | */ | |
244 | return -EPERM; | |
245 | } | |
1da177e4 | 246 | |
831830b5 AV |
247 | struct mm_struct *mm_for_maps(struct task_struct *task) |
248 | { | |
249 | struct mm_struct *mm = get_task_mm(task); | |
250 | if (!mm) | |
251 | return NULL; | |
252 | down_read(&mm->mmap_sem); | |
253 | task_lock(task); | |
254 | if (task->mm != mm) | |
255 | goto out; | |
006ebb40 SS |
256 | if (task->mm != current->mm && |
257 | __ptrace_may_access(task, PTRACE_MODE_READ) < 0) | |
831830b5 AV |
258 | goto out; |
259 | task_unlock(task); | |
260 | return mm; | |
261 | out: | |
262 | task_unlock(task); | |
263 | up_read(&mm->mmap_sem); | |
264 | mmput(mm); | |
265 | return NULL; | |
266 | } | |
267 | ||
1da177e4 LT |
268 | static int proc_pid_cmdline(struct task_struct *task, char * buffer) |
269 | { | |
270 | int res = 0; | |
271 | unsigned int len; | |
272 | struct mm_struct *mm = get_task_mm(task); | |
273 | if (!mm) | |
274 | goto out; | |
275 | if (!mm->arg_end) | |
276 | goto out_mm; /* Shh! No looking before we're done */ | |
277 | ||
278 | len = mm->arg_end - mm->arg_start; | |
279 | ||
280 | if (len > PAGE_SIZE) | |
281 | len = PAGE_SIZE; | |
282 | ||
283 | res = access_process_vm(task, mm->arg_start, buffer, len, 0); | |
284 | ||
285 | // If the nul at the end of args has been overwritten, then | |
286 | // assume application is using setproctitle(3). | |
287 | if (res > 0 && buffer[res-1] != '\0' && len < PAGE_SIZE) { | |
288 | len = strnlen(buffer, res); | |
289 | if (len < res) { | |
290 | res = len; | |
291 | } else { | |
292 | len = mm->env_end - mm->env_start; | |
293 | if (len > PAGE_SIZE - res) | |
294 | len = PAGE_SIZE - res; | |
295 | res += access_process_vm(task, mm->env_start, buffer+res, len, 0); | |
296 | res = strnlen(buffer, res); | |
297 | } | |
298 | } | |
299 | out_mm: | |
300 | mmput(mm); | |
301 | out: | |
302 | return res; | |
303 | } | |
304 | ||
305 | static int proc_pid_auxv(struct task_struct *task, char *buffer) | |
306 | { | |
307 | int res = 0; | |
308 | struct mm_struct *mm = get_task_mm(task); | |
309 | if (mm) { | |
310 | unsigned int nwords = 0; | |
311 | do | |
312 | nwords += 2; | |
313 | while (mm->saved_auxv[nwords - 2] != 0); /* AT_NULL */ | |
314 | res = nwords * sizeof(mm->saved_auxv[0]); | |
315 | if (res > PAGE_SIZE) | |
316 | res = PAGE_SIZE; | |
317 | memcpy(buffer, mm->saved_auxv, res); | |
318 | mmput(mm); | |
319 | } | |
320 | return res; | |
321 | } | |
322 | ||
323 | ||
324 | #ifdef CONFIG_KALLSYMS | |
325 | /* | |
326 | * Provides a wchan file via kallsyms in a proper one-value-per-file format. | |
327 | * Returns the resolved symbol. If that fails, simply return the address. | |
328 | */ | |
329 | static int proc_pid_wchan(struct task_struct *task, char *buffer) | |
330 | { | |
ffb45122 | 331 | unsigned long wchan; |
9281acea | 332 | char symname[KSYM_NAME_LEN]; |
1da177e4 LT |
333 | |
334 | wchan = get_wchan(task); | |
335 | ||
9d65cb4a AD |
336 | if (lookup_symbol_name(wchan, symname) < 0) |
337 | return sprintf(buffer, "%lu", wchan); | |
338 | else | |
339 | return sprintf(buffer, "%s", symname); | |
1da177e4 LT |
340 | } |
341 | #endif /* CONFIG_KALLSYMS */ | |
342 | ||
343 | #ifdef CONFIG_SCHEDSTATS | |
344 | /* | |
345 | * Provides /proc/PID/schedstat | |
346 | */ | |
347 | static int proc_pid_schedstat(struct task_struct *task, char *buffer) | |
348 | { | |
172ba844 | 349 | return sprintf(buffer, "%llu %llu %lu\n", |
826e08b0 IM |
350 | (unsigned long long)task->se.sum_exec_runtime, |
351 | (unsigned long long)task->sched_info.run_delay, | |
2d72376b | 352 | task->sched_info.pcount); |
1da177e4 LT |
353 | } |
354 | #endif | |
355 | ||
9745512c AV |
356 | #ifdef CONFIG_LATENCYTOP |
357 | static int lstats_show_proc(struct seq_file *m, void *v) | |
358 | { | |
359 | int i; | |
13d77c37 HS |
360 | struct inode *inode = m->private; |
361 | struct task_struct *task = get_proc_task(inode); | |
9745512c | 362 | |
13d77c37 HS |
363 | if (!task) |
364 | return -ESRCH; | |
365 | seq_puts(m, "Latency Top version : v0.1\n"); | |
9745512c AV |
366 | for (i = 0; i < 32; i++) { |
367 | if (task->latency_record[i].backtrace[0]) { | |
368 | int q; | |
369 | seq_printf(m, "%i %li %li ", | |
370 | task->latency_record[i].count, | |
371 | task->latency_record[i].time, | |
372 | task->latency_record[i].max); | |
373 | for (q = 0; q < LT_BACKTRACEDEPTH; q++) { | |
9c246247 | 374 | char sym[KSYM_SYMBOL_LEN]; |
9745512c AV |
375 | char *c; |
376 | if (!task->latency_record[i].backtrace[q]) | |
377 | break; | |
378 | if (task->latency_record[i].backtrace[q] == ULONG_MAX) | |
379 | break; | |
380 | sprint_symbol(sym, task->latency_record[i].backtrace[q]); | |
381 | c = strchr(sym, '+'); | |
382 | if (c) | |
383 | *c = 0; | |
384 | seq_printf(m, "%s ", sym); | |
385 | } | |
386 | seq_printf(m, "\n"); | |
387 | } | |
388 | ||
389 | } | |
13d77c37 | 390 | put_task_struct(task); |
9745512c AV |
391 | return 0; |
392 | } | |
393 | ||
394 | static int lstats_open(struct inode *inode, struct file *file) | |
395 | { | |
13d77c37 | 396 | return single_open(file, lstats_show_proc, inode); |
d6643d12 HS |
397 | } |
398 | ||
9745512c AV |
399 | static ssize_t lstats_write(struct file *file, const char __user *buf, |
400 | size_t count, loff_t *offs) | |
401 | { | |
13d77c37 | 402 | struct task_struct *task = get_proc_task(file->f_dentry->d_inode); |
9745512c | 403 | |
13d77c37 HS |
404 | if (!task) |
405 | return -ESRCH; | |
9745512c | 406 | clear_all_latency_tracing(task); |
13d77c37 | 407 | put_task_struct(task); |
9745512c AV |
408 | |
409 | return count; | |
410 | } | |
411 | ||
412 | static const struct file_operations proc_lstats_operations = { | |
413 | .open = lstats_open, | |
414 | .read = seq_read, | |
415 | .write = lstats_write, | |
416 | .llseek = seq_lseek, | |
13d77c37 | 417 | .release = single_release, |
9745512c AV |
418 | }; |
419 | ||
420 | #endif | |
421 | ||
1da177e4 LT |
422 | /* The badness from the OOM killer */ |
423 | unsigned long badness(struct task_struct *p, unsigned long uptime); | |
424 | static int proc_oom_score(struct task_struct *task, char *buffer) | |
425 | { | |
426 | unsigned long points; | |
427 | struct timespec uptime; | |
428 | ||
429 | do_posix_clock_monotonic_gettime(&uptime); | |
19c5d45a | 430 | read_lock(&tasklist_lock); |
1da177e4 | 431 | points = badness(task, uptime.tv_sec); |
19c5d45a | 432 | read_unlock(&tasklist_lock); |
1da177e4 LT |
433 | return sprintf(buffer, "%lu\n", points); |
434 | } | |
435 | ||
d85f50d5 NH |
436 | struct limit_names { |
437 | char *name; | |
438 | char *unit; | |
439 | }; | |
440 | ||
441 | static const struct limit_names lnames[RLIM_NLIMITS] = { | |
442 | [RLIMIT_CPU] = {"Max cpu time", "ms"}, | |
443 | [RLIMIT_FSIZE] = {"Max file size", "bytes"}, | |
444 | [RLIMIT_DATA] = {"Max data size", "bytes"}, | |
445 | [RLIMIT_STACK] = {"Max stack size", "bytes"}, | |
446 | [RLIMIT_CORE] = {"Max core file size", "bytes"}, | |
447 | [RLIMIT_RSS] = {"Max resident set", "bytes"}, | |
448 | [RLIMIT_NPROC] = {"Max processes", "processes"}, | |
449 | [RLIMIT_NOFILE] = {"Max open files", "files"}, | |
450 | [RLIMIT_MEMLOCK] = {"Max locked memory", "bytes"}, | |
451 | [RLIMIT_AS] = {"Max address space", "bytes"}, | |
452 | [RLIMIT_LOCKS] = {"Max file locks", "locks"}, | |
453 | [RLIMIT_SIGPENDING] = {"Max pending signals", "signals"}, | |
454 | [RLIMIT_MSGQUEUE] = {"Max msgqueue size", "bytes"}, | |
455 | [RLIMIT_NICE] = {"Max nice priority", NULL}, | |
456 | [RLIMIT_RTPRIO] = {"Max realtime priority", NULL}, | |
8808117c | 457 | [RLIMIT_RTTIME] = {"Max realtime timeout", "us"}, |
d85f50d5 NH |
458 | }; |
459 | ||
460 | /* Display limits for a process */ | |
461 | static int proc_pid_limits(struct task_struct *task, char *buffer) | |
462 | { | |
463 | unsigned int i; | |
464 | int count = 0; | |
465 | unsigned long flags; | |
466 | char *bufptr = buffer; | |
467 | ||
468 | struct rlimit rlim[RLIM_NLIMITS]; | |
469 | ||
a6bebbc8 | 470 | if (!lock_task_sighand(task, &flags)) |
d85f50d5 | 471 | return 0; |
d85f50d5 NH |
472 | memcpy(rlim, task->signal->rlim, sizeof(struct rlimit) * RLIM_NLIMITS); |
473 | unlock_task_sighand(task, &flags); | |
d85f50d5 NH |
474 | |
475 | /* | |
476 | * print the file header | |
477 | */ | |
478 | count += sprintf(&bufptr[count], "%-25s %-20s %-20s %-10s\n", | |
479 | "Limit", "Soft Limit", "Hard Limit", "Units"); | |
480 | ||
481 | for (i = 0; i < RLIM_NLIMITS; i++) { | |
482 | if (rlim[i].rlim_cur == RLIM_INFINITY) | |
483 | count += sprintf(&bufptr[count], "%-25s %-20s ", | |
484 | lnames[i].name, "unlimited"); | |
485 | else | |
486 | count += sprintf(&bufptr[count], "%-25s %-20lu ", | |
487 | lnames[i].name, rlim[i].rlim_cur); | |
488 | ||
489 | if (rlim[i].rlim_max == RLIM_INFINITY) | |
490 | count += sprintf(&bufptr[count], "%-20s ", "unlimited"); | |
491 | else | |
492 | count += sprintf(&bufptr[count], "%-20lu ", | |
493 | rlim[i].rlim_max); | |
494 | ||
495 | if (lnames[i].unit) | |
496 | count += sprintf(&bufptr[count], "%-10s\n", | |
497 | lnames[i].unit); | |
498 | else | |
499 | count += sprintf(&bufptr[count], "\n"); | |
500 | } | |
501 | ||
502 | return count; | |
503 | } | |
504 | ||
ebcb6734 RM |
505 | #ifdef CONFIG_HAVE_ARCH_TRACEHOOK |
506 | static int proc_pid_syscall(struct task_struct *task, char *buffer) | |
507 | { | |
508 | long nr; | |
509 | unsigned long args[6], sp, pc; | |
510 | ||
511 | if (task_current_syscall(task, &nr, args, 6, &sp, &pc)) | |
512 | return sprintf(buffer, "running\n"); | |
513 | ||
514 | if (nr < 0) | |
515 | return sprintf(buffer, "%ld 0x%lx 0x%lx\n", nr, sp, pc); | |
516 | ||
517 | return sprintf(buffer, | |
518 | "%ld 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx\n", | |
519 | nr, | |
520 | args[0], args[1], args[2], args[3], args[4], args[5], | |
521 | sp, pc); | |
522 | } | |
523 | #endif /* CONFIG_HAVE_ARCH_TRACEHOOK */ | |
524 | ||
1da177e4 LT |
525 | /************************************************************************/ |
526 | /* Here the fs part begins */ | |
527 | /************************************************************************/ | |
528 | ||
529 | /* permission checks */ | |
778c1144 | 530 | static int proc_fd_access_allowed(struct inode *inode) |
1da177e4 | 531 | { |
778c1144 EB |
532 | struct task_struct *task; |
533 | int allowed = 0; | |
df26c40e EB |
534 | /* Allow access to a task's file descriptors if it is us or we |
535 | * may use ptrace attach to the process and find out that | |
536 | * information. | |
778c1144 EB |
537 | */ |
538 | task = get_proc_task(inode); | |
df26c40e | 539 | if (task) { |
006ebb40 | 540 | allowed = ptrace_may_access(task, PTRACE_MODE_READ); |
778c1144 | 541 | put_task_struct(task); |
df26c40e | 542 | } |
778c1144 | 543 | return allowed; |
1da177e4 LT |
544 | } |
545 | ||
6d76fa58 LT |
546 | static int proc_setattr(struct dentry *dentry, struct iattr *attr) |
547 | { | |
548 | int error; | |
549 | struct inode *inode = dentry->d_inode; | |
550 | ||
551 | if (attr->ia_valid & ATTR_MODE) | |
552 | return -EPERM; | |
553 | ||
554 | error = inode_change_ok(inode, attr); | |
1e8123fd JJ |
555 | if (!error) |
556 | error = inode_setattr(inode, attr); | |
6d76fa58 LT |
557 | return error; |
558 | } | |
559 | ||
c5ef1c42 | 560 | static const struct inode_operations proc_def_inode_operations = { |
6d76fa58 LT |
561 | .setattr = proc_setattr, |
562 | }; | |
563 | ||
a1a2c409 MS |
564 | static int mounts_open_common(struct inode *inode, struct file *file, |
565 | const struct seq_operations *op) | |
1da177e4 | 566 | { |
99f89551 | 567 | struct task_struct *task = get_proc_task(inode); |
cf7b708c | 568 | struct nsproxy *nsp; |
6b3286ed | 569 | struct mnt_namespace *ns = NULL; |
a1a2c409 MS |
570 | struct fs_struct *fs = NULL; |
571 | struct path root; | |
5addc5dd AV |
572 | struct proc_mounts *p; |
573 | int ret = -EINVAL; | |
1da177e4 | 574 | |
99f89551 | 575 | if (task) { |
cf7b708c PE |
576 | rcu_read_lock(); |
577 | nsp = task_nsproxy(task); | |
578 | if (nsp) { | |
579 | ns = nsp->mnt_ns; | |
863c4702 AD |
580 | if (ns) |
581 | get_mnt_ns(ns); | |
582 | } | |
cf7b708c | 583 | rcu_read_unlock(); |
a1a2c409 MS |
584 | if (ns) |
585 | fs = get_fs_struct(task); | |
99f89551 EB |
586 | put_task_struct(task); |
587 | } | |
5addc5dd | 588 | |
a1a2c409 MS |
589 | if (!ns) |
590 | goto err; | |
591 | if (!fs) | |
592 | goto err_put_ns; | |
593 | ||
594 | read_lock(&fs->lock); | |
595 | root = fs->root; | |
596 | path_get(&root); | |
597 | read_unlock(&fs->lock); | |
598 | put_fs_struct(fs); | |
599 | ||
600 | ret = -ENOMEM; | |
601 | p = kmalloc(sizeof(struct proc_mounts), GFP_KERNEL); | |
602 | if (!p) | |
603 | goto err_put_path; | |
604 | ||
605 | file->private_data = &p->m; | |
606 | ret = seq_open(file, op); | |
607 | if (ret) | |
608 | goto err_free; | |
609 | ||
610 | p->m.private = p; | |
611 | p->ns = ns; | |
612 | p->root = root; | |
613 | p->event = ns->event; | |
614 | ||
615 | return 0; | |
616 | ||
617 | err_free: | |
618 | kfree(p); | |
619 | err_put_path: | |
620 | path_put(&root); | |
621 | err_put_ns: | |
622 | put_mnt_ns(ns); | |
623 | err: | |
1da177e4 LT |
624 | return ret; |
625 | } | |
626 | ||
627 | static int mounts_release(struct inode *inode, struct file *file) | |
628 | { | |
a1a2c409 MS |
629 | struct proc_mounts *p = file->private_data; |
630 | path_put(&p->root); | |
631 | put_mnt_ns(p->ns); | |
1da177e4 LT |
632 | return seq_release(inode, file); |
633 | } | |
634 | ||
5addc5dd AV |
635 | static unsigned mounts_poll(struct file *file, poll_table *wait) |
636 | { | |
637 | struct proc_mounts *p = file->private_data; | |
a1a2c409 | 638 | struct mnt_namespace *ns = p->ns; |
5addc5dd AV |
639 | unsigned res = 0; |
640 | ||
641 | poll_wait(file, &ns->poll, wait); | |
642 | ||
643 | spin_lock(&vfsmount_lock); | |
644 | if (p->event != ns->event) { | |
645 | p->event = ns->event; | |
646 | res = POLLERR; | |
647 | } | |
648 | spin_unlock(&vfsmount_lock); | |
649 | ||
650 | return res; | |
651 | } | |
652 | ||
a1a2c409 MS |
653 | static int mounts_open(struct inode *inode, struct file *file) |
654 | { | |
655 | return mounts_open_common(inode, file, &mounts_op); | |
656 | } | |
657 | ||
00977a59 | 658 | static const struct file_operations proc_mounts_operations = { |
1da177e4 LT |
659 | .open = mounts_open, |
660 | .read = seq_read, | |
661 | .llseek = seq_lseek, | |
662 | .release = mounts_release, | |
5addc5dd | 663 | .poll = mounts_poll, |
1da177e4 LT |
664 | }; |
665 | ||
2d4d4864 RP |
666 | static int mountinfo_open(struct inode *inode, struct file *file) |
667 | { | |
668 | return mounts_open_common(inode, file, &mountinfo_op); | |
669 | } | |
670 | ||
671 | static const struct file_operations proc_mountinfo_operations = { | |
672 | .open = mountinfo_open, | |
673 | .read = seq_read, | |
674 | .llseek = seq_lseek, | |
675 | .release = mounts_release, | |
676 | .poll = mounts_poll, | |
677 | }; | |
678 | ||
b4629fe2 CL |
679 | static int mountstats_open(struct inode *inode, struct file *file) |
680 | { | |
a1a2c409 | 681 | return mounts_open_common(inode, file, &mountstats_op); |
b4629fe2 CL |
682 | } |
683 | ||
00977a59 | 684 | static const struct file_operations proc_mountstats_operations = { |
b4629fe2 CL |
685 | .open = mountstats_open, |
686 | .read = seq_read, | |
687 | .llseek = seq_lseek, | |
688 | .release = mounts_release, | |
689 | }; | |
690 | ||
1da177e4 LT |
691 | #define PROC_BLOCK_SIZE (3*1024) /* 4K page size but our output routines use some slack for overruns */ |
692 | ||
693 | static ssize_t proc_info_read(struct file * file, char __user * buf, | |
694 | size_t count, loff_t *ppos) | |
695 | { | |
2fddfeef | 696 | struct inode * inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
697 | unsigned long page; |
698 | ssize_t length; | |
99f89551 EB |
699 | struct task_struct *task = get_proc_task(inode); |
700 | ||
701 | length = -ESRCH; | |
702 | if (!task) | |
703 | goto out_no_task; | |
1da177e4 LT |
704 | |
705 | if (count > PROC_BLOCK_SIZE) | |
706 | count = PROC_BLOCK_SIZE; | |
99f89551 EB |
707 | |
708 | length = -ENOMEM; | |
e12ba74d | 709 | if (!(page = __get_free_page(GFP_TEMPORARY))) |
99f89551 | 710 | goto out; |
1da177e4 LT |
711 | |
712 | length = PROC_I(inode)->op.proc_read(task, (char*)page); | |
713 | ||
714 | if (length >= 0) | |
715 | length = simple_read_from_buffer(buf, count, ppos, (char *)page, length); | |
716 | free_page(page); | |
99f89551 EB |
717 | out: |
718 | put_task_struct(task); | |
719 | out_no_task: | |
1da177e4 LT |
720 | return length; |
721 | } | |
722 | ||
00977a59 | 723 | static const struct file_operations proc_info_file_operations = { |
1da177e4 LT |
724 | .read = proc_info_read, |
725 | }; | |
726 | ||
be614086 EB |
727 | static int proc_single_show(struct seq_file *m, void *v) |
728 | { | |
729 | struct inode *inode = m->private; | |
730 | struct pid_namespace *ns; | |
731 | struct pid *pid; | |
732 | struct task_struct *task; | |
733 | int ret; | |
734 | ||
735 | ns = inode->i_sb->s_fs_info; | |
736 | pid = proc_pid(inode); | |
737 | task = get_pid_task(pid, PIDTYPE_PID); | |
738 | if (!task) | |
739 | return -ESRCH; | |
740 | ||
741 | ret = PROC_I(inode)->op.proc_show(m, ns, pid, task); | |
742 | ||
743 | put_task_struct(task); | |
744 | return ret; | |
745 | } | |
746 | ||
747 | static int proc_single_open(struct inode *inode, struct file *filp) | |
748 | { | |
749 | int ret; | |
750 | ret = single_open(filp, proc_single_show, NULL); | |
751 | if (!ret) { | |
752 | struct seq_file *m = filp->private_data; | |
753 | ||
754 | m->private = inode; | |
755 | } | |
756 | return ret; | |
757 | } | |
758 | ||
759 | static const struct file_operations proc_single_file_operations = { | |
760 | .open = proc_single_open, | |
761 | .read = seq_read, | |
762 | .llseek = seq_lseek, | |
763 | .release = single_release, | |
764 | }; | |
765 | ||
1da177e4 LT |
766 | static int mem_open(struct inode* inode, struct file* file) |
767 | { | |
768 | file->private_data = (void*)((long)current->self_exec_id); | |
769 | return 0; | |
770 | } | |
771 | ||
772 | static ssize_t mem_read(struct file * file, char __user * buf, | |
773 | size_t count, loff_t *ppos) | |
774 | { | |
2fddfeef | 775 | struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode); |
1da177e4 LT |
776 | char *page; |
777 | unsigned long src = *ppos; | |
778 | int ret = -ESRCH; | |
779 | struct mm_struct *mm; | |
780 | ||
99f89551 EB |
781 | if (!task) |
782 | goto out_no_task; | |
783 | ||
638fa202 | 784 | if (check_mem_permission(task)) |
1da177e4 LT |
785 | goto out; |
786 | ||
787 | ret = -ENOMEM; | |
e12ba74d | 788 | page = (char *)__get_free_page(GFP_TEMPORARY); |
1da177e4 LT |
789 | if (!page) |
790 | goto out; | |
791 | ||
792 | ret = 0; | |
793 | ||
794 | mm = get_task_mm(task); | |
795 | if (!mm) | |
796 | goto out_free; | |
797 | ||
798 | ret = -EIO; | |
799 | ||
800 | if (file->private_data != (void*)((long)current->self_exec_id)) | |
801 | goto out_put; | |
802 | ||
803 | ret = 0; | |
804 | ||
805 | while (count > 0) { | |
806 | int this_len, retval; | |
807 | ||
808 | this_len = (count > PAGE_SIZE) ? PAGE_SIZE : count; | |
809 | retval = access_process_vm(task, src, page, this_len, 0); | |
638fa202 | 810 | if (!retval || check_mem_permission(task)) { |
1da177e4 LT |
811 | if (!ret) |
812 | ret = -EIO; | |
813 | break; | |
814 | } | |
815 | ||
816 | if (copy_to_user(buf, page, retval)) { | |
817 | ret = -EFAULT; | |
818 | break; | |
819 | } | |
820 | ||
821 | ret += retval; | |
822 | src += retval; | |
823 | buf += retval; | |
824 | count -= retval; | |
825 | } | |
826 | *ppos = src; | |
827 | ||
828 | out_put: | |
829 | mmput(mm); | |
830 | out_free: | |
831 | free_page((unsigned long) page); | |
832 | out: | |
99f89551 EB |
833 | put_task_struct(task); |
834 | out_no_task: | |
1da177e4 LT |
835 | return ret; |
836 | } | |
837 | ||
838 | #define mem_write NULL | |
839 | ||
840 | #ifndef mem_write | |
841 | /* This is a security hazard */ | |
63967fa9 | 842 | static ssize_t mem_write(struct file * file, const char __user *buf, |
1da177e4 LT |
843 | size_t count, loff_t *ppos) |
844 | { | |
f7ca54f4 | 845 | int copied; |
1da177e4 | 846 | char *page; |
2fddfeef | 847 | struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode); |
1da177e4 LT |
848 | unsigned long dst = *ppos; |
849 | ||
99f89551 EB |
850 | copied = -ESRCH; |
851 | if (!task) | |
852 | goto out_no_task; | |
853 | ||
638fa202 | 854 | if (check_mem_permission(task)) |
99f89551 | 855 | goto out; |
1da177e4 | 856 | |
99f89551 | 857 | copied = -ENOMEM; |
e12ba74d | 858 | page = (char *)__get_free_page(GFP_TEMPORARY); |
1da177e4 | 859 | if (!page) |
99f89551 | 860 | goto out; |
1da177e4 | 861 | |
f7ca54f4 | 862 | copied = 0; |
1da177e4 LT |
863 | while (count > 0) { |
864 | int this_len, retval; | |
865 | ||
866 | this_len = (count > PAGE_SIZE) ? PAGE_SIZE : count; | |
867 | if (copy_from_user(page, buf, this_len)) { | |
868 | copied = -EFAULT; | |
869 | break; | |
870 | } | |
871 | retval = access_process_vm(task, dst, page, this_len, 1); | |
872 | if (!retval) { | |
873 | if (!copied) | |
874 | copied = -EIO; | |
875 | break; | |
876 | } | |
877 | copied += retval; | |
878 | buf += retval; | |
879 | dst += retval; | |
880 | count -= retval; | |
881 | } | |
882 | *ppos = dst; | |
883 | free_page((unsigned long) page); | |
99f89551 EB |
884 | out: |
885 | put_task_struct(task); | |
886 | out_no_task: | |
1da177e4 LT |
887 | return copied; |
888 | } | |
889 | #endif | |
890 | ||
85863e47 | 891 | loff_t mem_lseek(struct file *file, loff_t offset, int orig) |
1da177e4 LT |
892 | { |
893 | switch (orig) { | |
894 | case 0: | |
895 | file->f_pos = offset; | |
896 | break; | |
897 | case 1: | |
898 | file->f_pos += offset; | |
899 | break; | |
900 | default: | |
901 | return -EINVAL; | |
902 | } | |
903 | force_successful_syscall_return(); | |
904 | return file->f_pos; | |
905 | } | |
906 | ||
00977a59 | 907 | static const struct file_operations proc_mem_operations = { |
1da177e4 LT |
908 | .llseek = mem_lseek, |
909 | .read = mem_read, | |
910 | .write = mem_write, | |
911 | .open = mem_open, | |
912 | }; | |
913 | ||
315e28c8 JP |
914 | static ssize_t environ_read(struct file *file, char __user *buf, |
915 | size_t count, loff_t *ppos) | |
916 | { | |
917 | struct task_struct *task = get_proc_task(file->f_dentry->d_inode); | |
918 | char *page; | |
919 | unsigned long src = *ppos; | |
920 | int ret = -ESRCH; | |
921 | struct mm_struct *mm; | |
922 | ||
923 | if (!task) | |
924 | goto out_no_task; | |
925 | ||
006ebb40 | 926 | if (!ptrace_may_access(task, PTRACE_MODE_READ)) |
315e28c8 JP |
927 | goto out; |
928 | ||
929 | ret = -ENOMEM; | |
930 | page = (char *)__get_free_page(GFP_TEMPORARY); | |
931 | if (!page) | |
932 | goto out; | |
933 | ||
934 | ret = 0; | |
935 | ||
936 | mm = get_task_mm(task); | |
937 | if (!mm) | |
938 | goto out_free; | |
939 | ||
940 | while (count > 0) { | |
941 | int this_len, retval, max_len; | |
942 | ||
943 | this_len = mm->env_end - (mm->env_start + src); | |
944 | ||
945 | if (this_len <= 0) | |
946 | break; | |
947 | ||
948 | max_len = (count > PAGE_SIZE) ? PAGE_SIZE : count; | |
949 | this_len = (this_len > max_len) ? max_len : this_len; | |
950 | ||
951 | retval = access_process_vm(task, (mm->env_start + src), | |
952 | page, this_len, 0); | |
953 | ||
954 | if (retval <= 0) { | |
955 | ret = retval; | |
956 | break; | |
957 | } | |
958 | ||
959 | if (copy_to_user(buf, page, retval)) { | |
960 | ret = -EFAULT; | |
961 | break; | |
962 | } | |
963 | ||
964 | ret += retval; | |
965 | src += retval; | |
966 | buf += retval; | |
967 | count -= retval; | |
968 | } | |
969 | *ppos = src; | |
970 | ||
971 | mmput(mm); | |
972 | out_free: | |
973 | free_page((unsigned long) page); | |
974 | out: | |
975 | put_task_struct(task); | |
976 | out_no_task: | |
977 | return ret; | |
978 | } | |
979 | ||
980 | static const struct file_operations proc_environ_operations = { | |
981 | .read = environ_read, | |
982 | }; | |
983 | ||
1da177e4 LT |
984 | static ssize_t oom_adjust_read(struct file *file, char __user *buf, |
985 | size_t count, loff_t *ppos) | |
986 | { | |
2fddfeef | 987 | struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode); |
8578cea7 | 988 | char buffer[PROC_NUMBUF]; |
1da177e4 | 989 | size_t len; |
99f89551 | 990 | int oom_adjust; |
1da177e4 | 991 | |
99f89551 EB |
992 | if (!task) |
993 | return -ESRCH; | |
994 | oom_adjust = task->oomkilladj; | |
995 | put_task_struct(task); | |
996 | ||
8578cea7 | 997 | len = snprintf(buffer, sizeof(buffer), "%i\n", oom_adjust); |
0c28f287 AM |
998 | |
999 | return simple_read_from_buffer(buf, count, ppos, buffer, len); | |
1da177e4 LT |
1000 | } |
1001 | ||
1002 | static ssize_t oom_adjust_write(struct file *file, const char __user *buf, | |
1003 | size_t count, loff_t *ppos) | |
1004 | { | |
99f89551 | 1005 | struct task_struct *task; |
8578cea7 | 1006 | char buffer[PROC_NUMBUF], *end; |
1da177e4 LT |
1007 | int oom_adjust; |
1008 | ||
8578cea7 EB |
1009 | memset(buffer, 0, sizeof(buffer)); |
1010 | if (count > sizeof(buffer) - 1) | |
1011 | count = sizeof(buffer) - 1; | |
1da177e4 LT |
1012 | if (copy_from_user(buffer, buf, count)) |
1013 | return -EFAULT; | |
1014 | oom_adjust = simple_strtol(buffer, &end, 0); | |
8ac773b4 AD |
1015 | if ((oom_adjust < OOM_ADJUST_MIN || oom_adjust > OOM_ADJUST_MAX) && |
1016 | oom_adjust != OOM_DISABLE) | |
1da177e4 LT |
1017 | return -EINVAL; |
1018 | if (*end == '\n') | |
1019 | end++; | |
2fddfeef | 1020 | task = get_proc_task(file->f_path.dentry->d_inode); |
99f89551 EB |
1021 | if (!task) |
1022 | return -ESRCH; | |
8fb4fc68 GJ |
1023 | if (oom_adjust < task->oomkilladj && !capable(CAP_SYS_RESOURCE)) { |
1024 | put_task_struct(task); | |
1025 | return -EACCES; | |
1026 | } | |
1da177e4 | 1027 | task->oomkilladj = oom_adjust; |
99f89551 | 1028 | put_task_struct(task); |
1da177e4 LT |
1029 | if (end - buffer == 0) |
1030 | return -EIO; | |
1031 | return end - buffer; | |
1032 | } | |
1033 | ||
00977a59 | 1034 | static const struct file_operations proc_oom_adjust_operations = { |
1da177e4 LT |
1035 | .read = oom_adjust_read, |
1036 | .write = oom_adjust_write, | |
1037 | }; | |
1038 | ||
1da177e4 LT |
1039 | #ifdef CONFIG_AUDITSYSCALL |
1040 | #define TMPBUFLEN 21 | |
1041 | static ssize_t proc_loginuid_read(struct file * file, char __user * buf, | |
1042 | size_t count, loff_t *ppos) | |
1043 | { | |
2fddfeef | 1044 | struct inode * inode = file->f_path.dentry->d_inode; |
99f89551 | 1045 | struct task_struct *task = get_proc_task(inode); |
1da177e4 LT |
1046 | ssize_t length; |
1047 | char tmpbuf[TMPBUFLEN]; | |
1048 | ||
99f89551 EB |
1049 | if (!task) |
1050 | return -ESRCH; | |
1da177e4 | 1051 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", |
0c11b942 | 1052 | audit_get_loginuid(task)); |
99f89551 | 1053 | put_task_struct(task); |
1da177e4 LT |
1054 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); |
1055 | } | |
1056 | ||
1057 | static ssize_t proc_loginuid_write(struct file * file, const char __user * buf, | |
1058 | size_t count, loff_t *ppos) | |
1059 | { | |
2fddfeef | 1060 | struct inode * inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
1061 | char *page, *tmp; |
1062 | ssize_t length; | |
1da177e4 LT |
1063 | uid_t loginuid; |
1064 | ||
1065 | if (!capable(CAP_AUDIT_CONTROL)) | |
1066 | return -EPERM; | |
1067 | ||
13b41b09 | 1068 | if (current != pid_task(proc_pid(inode), PIDTYPE_PID)) |
1da177e4 LT |
1069 | return -EPERM; |
1070 | ||
e0182909 AV |
1071 | if (count >= PAGE_SIZE) |
1072 | count = PAGE_SIZE - 1; | |
1da177e4 LT |
1073 | |
1074 | if (*ppos != 0) { | |
1075 | /* No partial writes. */ | |
1076 | return -EINVAL; | |
1077 | } | |
e12ba74d | 1078 | page = (char*)__get_free_page(GFP_TEMPORARY); |
1da177e4 LT |
1079 | if (!page) |
1080 | return -ENOMEM; | |
1081 | length = -EFAULT; | |
1082 | if (copy_from_user(page, buf, count)) | |
1083 | goto out_free_page; | |
1084 | ||
e0182909 | 1085 | page[count] = '\0'; |
1da177e4 LT |
1086 | loginuid = simple_strtoul(page, &tmp, 10); |
1087 | if (tmp == page) { | |
1088 | length = -EINVAL; | |
1089 | goto out_free_page; | |
1090 | ||
1091 | } | |
99f89551 | 1092 | length = audit_set_loginuid(current, loginuid); |
1da177e4 LT |
1093 | if (likely(length == 0)) |
1094 | length = count; | |
1095 | ||
1096 | out_free_page: | |
1097 | free_page((unsigned long) page); | |
1098 | return length; | |
1099 | } | |
1100 | ||
00977a59 | 1101 | static const struct file_operations proc_loginuid_operations = { |
1da177e4 LT |
1102 | .read = proc_loginuid_read, |
1103 | .write = proc_loginuid_write, | |
1104 | }; | |
1e0bd755 EP |
1105 | |
1106 | static ssize_t proc_sessionid_read(struct file * file, char __user * buf, | |
1107 | size_t count, loff_t *ppos) | |
1108 | { | |
1109 | struct inode * inode = file->f_path.dentry->d_inode; | |
1110 | struct task_struct *task = get_proc_task(inode); | |
1111 | ssize_t length; | |
1112 | char tmpbuf[TMPBUFLEN]; | |
1113 | ||
1114 | if (!task) | |
1115 | return -ESRCH; | |
1116 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", | |
1117 | audit_get_sessionid(task)); | |
1118 | put_task_struct(task); | |
1119 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
1120 | } | |
1121 | ||
1122 | static const struct file_operations proc_sessionid_operations = { | |
1123 | .read = proc_sessionid_read, | |
1124 | }; | |
1da177e4 LT |
1125 | #endif |
1126 | ||
f4f154fd AM |
1127 | #ifdef CONFIG_FAULT_INJECTION |
1128 | static ssize_t proc_fault_inject_read(struct file * file, char __user * buf, | |
1129 | size_t count, loff_t *ppos) | |
1130 | { | |
1131 | struct task_struct *task = get_proc_task(file->f_dentry->d_inode); | |
1132 | char buffer[PROC_NUMBUF]; | |
1133 | size_t len; | |
1134 | int make_it_fail; | |
f4f154fd AM |
1135 | |
1136 | if (!task) | |
1137 | return -ESRCH; | |
1138 | make_it_fail = task->make_it_fail; | |
1139 | put_task_struct(task); | |
1140 | ||
1141 | len = snprintf(buffer, sizeof(buffer), "%i\n", make_it_fail); | |
0c28f287 AM |
1142 | |
1143 | return simple_read_from_buffer(buf, count, ppos, buffer, len); | |
f4f154fd AM |
1144 | } |
1145 | ||
1146 | static ssize_t proc_fault_inject_write(struct file * file, | |
1147 | const char __user * buf, size_t count, loff_t *ppos) | |
1148 | { | |
1149 | struct task_struct *task; | |
1150 | char buffer[PROC_NUMBUF], *end; | |
1151 | int make_it_fail; | |
1152 | ||
1153 | if (!capable(CAP_SYS_RESOURCE)) | |
1154 | return -EPERM; | |
1155 | memset(buffer, 0, sizeof(buffer)); | |
1156 | if (count > sizeof(buffer) - 1) | |
1157 | count = sizeof(buffer) - 1; | |
1158 | if (copy_from_user(buffer, buf, count)) | |
1159 | return -EFAULT; | |
1160 | make_it_fail = simple_strtol(buffer, &end, 0); | |
1161 | if (*end == '\n') | |
1162 | end++; | |
1163 | task = get_proc_task(file->f_dentry->d_inode); | |
1164 | if (!task) | |
1165 | return -ESRCH; | |
1166 | task->make_it_fail = make_it_fail; | |
1167 | put_task_struct(task); | |
1168 | if (end - buffer == 0) | |
1169 | return -EIO; | |
1170 | return end - buffer; | |
1171 | } | |
1172 | ||
00977a59 | 1173 | static const struct file_operations proc_fault_inject_operations = { |
f4f154fd AM |
1174 | .read = proc_fault_inject_read, |
1175 | .write = proc_fault_inject_write, | |
1176 | }; | |
1177 | #endif | |
1178 | ||
9745512c | 1179 | |
43ae34cb IM |
1180 | #ifdef CONFIG_SCHED_DEBUG |
1181 | /* | |
1182 | * Print out various scheduling related per-task fields: | |
1183 | */ | |
1184 | static int sched_show(struct seq_file *m, void *v) | |
1185 | { | |
1186 | struct inode *inode = m->private; | |
1187 | struct task_struct *p; | |
1188 | ||
1189 | WARN_ON(!inode); | |
1190 | ||
1191 | p = get_proc_task(inode); | |
1192 | if (!p) | |
1193 | return -ESRCH; | |
1194 | proc_sched_show_task(p, m); | |
1195 | ||
1196 | put_task_struct(p); | |
1197 | ||
1198 | return 0; | |
1199 | } | |
1200 | ||
1201 | static ssize_t | |
1202 | sched_write(struct file *file, const char __user *buf, | |
1203 | size_t count, loff_t *offset) | |
1204 | { | |
1205 | struct inode *inode = file->f_path.dentry->d_inode; | |
1206 | struct task_struct *p; | |
1207 | ||
1208 | WARN_ON(!inode); | |
1209 | ||
1210 | p = get_proc_task(inode); | |
1211 | if (!p) | |
1212 | return -ESRCH; | |
1213 | proc_sched_set_task(p); | |
1214 | ||
1215 | put_task_struct(p); | |
1216 | ||
1217 | return count; | |
1218 | } | |
1219 | ||
1220 | static int sched_open(struct inode *inode, struct file *filp) | |
1221 | { | |
1222 | int ret; | |
1223 | ||
1224 | ret = single_open(filp, sched_show, NULL); | |
1225 | if (!ret) { | |
1226 | struct seq_file *m = filp->private_data; | |
1227 | ||
1228 | m->private = inode; | |
1229 | } | |
1230 | return ret; | |
1231 | } | |
1232 | ||
1233 | static const struct file_operations proc_pid_sched_operations = { | |
1234 | .open = sched_open, | |
1235 | .read = seq_read, | |
1236 | .write = sched_write, | |
1237 | .llseek = seq_lseek, | |
5ea473a1 | 1238 | .release = single_release, |
43ae34cb IM |
1239 | }; |
1240 | ||
1241 | #endif | |
1242 | ||
925d1c40 MH |
1243 | /* |
1244 | * We added or removed a vma mapping the executable. The vmas are only mapped | |
1245 | * during exec and are not mapped with the mmap system call. | |
1246 | * Callers must hold down_write() on the mm's mmap_sem for these | |
1247 | */ | |
1248 | void added_exe_file_vma(struct mm_struct *mm) | |
1249 | { | |
1250 | mm->num_exe_file_vmas++; | |
1251 | } | |
1252 | ||
1253 | void removed_exe_file_vma(struct mm_struct *mm) | |
1254 | { | |
1255 | mm->num_exe_file_vmas--; | |
1256 | if ((mm->num_exe_file_vmas == 0) && mm->exe_file){ | |
1257 | fput(mm->exe_file); | |
1258 | mm->exe_file = NULL; | |
1259 | } | |
1260 | ||
1261 | } | |
1262 | ||
1263 | void set_mm_exe_file(struct mm_struct *mm, struct file *new_exe_file) | |
1264 | { | |
1265 | if (new_exe_file) | |
1266 | get_file(new_exe_file); | |
1267 | if (mm->exe_file) | |
1268 | fput(mm->exe_file); | |
1269 | mm->exe_file = new_exe_file; | |
1270 | mm->num_exe_file_vmas = 0; | |
1271 | } | |
1272 | ||
1273 | struct file *get_mm_exe_file(struct mm_struct *mm) | |
1274 | { | |
1275 | struct file *exe_file; | |
1276 | ||
1277 | /* We need mmap_sem to protect against races with removal of | |
1278 | * VM_EXECUTABLE vmas */ | |
1279 | down_read(&mm->mmap_sem); | |
1280 | exe_file = mm->exe_file; | |
1281 | if (exe_file) | |
1282 | get_file(exe_file); | |
1283 | up_read(&mm->mmap_sem); | |
1284 | return exe_file; | |
1285 | } | |
1286 | ||
1287 | void dup_mm_exe_file(struct mm_struct *oldmm, struct mm_struct *newmm) | |
1288 | { | |
1289 | /* It's safe to write the exe_file pointer without exe_file_lock because | |
1290 | * this is called during fork when the task is not yet in /proc */ | |
1291 | newmm->exe_file = get_mm_exe_file(oldmm); | |
1292 | } | |
1293 | ||
1294 | static int proc_exe_link(struct inode *inode, struct path *exe_path) | |
1295 | { | |
1296 | struct task_struct *task; | |
1297 | struct mm_struct *mm; | |
1298 | struct file *exe_file; | |
1299 | ||
1300 | task = get_proc_task(inode); | |
1301 | if (!task) | |
1302 | return -ENOENT; | |
1303 | mm = get_task_mm(task); | |
1304 | put_task_struct(task); | |
1305 | if (!mm) | |
1306 | return -ENOENT; | |
1307 | exe_file = get_mm_exe_file(mm); | |
1308 | mmput(mm); | |
1309 | if (exe_file) { | |
1310 | *exe_path = exe_file->f_path; | |
1311 | path_get(&exe_file->f_path); | |
1312 | fput(exe_file); | |
1313 | return 0; | |
1314 | } else | |
1315 | return -ENOENT; | |
1316 | } | |
1317 | ||
008b150a | 1318 | static void *proc_pid_follow_link(struct dentry *dentry, struct nameidata *nd) |
1da177e4 LT |
1319 | { |
1320 | struct inode *inode = dentry->d_inode; | |
1321 | int error = -EACCES; | |
1322 | ||
1323 | /* We don't need a base pointer in the /proc filesystem */ | |
1d957f9b | 1324 | path_put(&nd->path); |
1da177e4 | 1325 | |
778c1144 EB |
1326 | /* Are we allowed to snoop on the tasks file descriptors? */ |
1327 | if (!proc_fd_access_allowed(inode)) | |
1da177e4 | 1328 | goto out; |
1da177e4 | 1329 | |
3dcd25f3 | 1330 | error = PROC_I(inode)->op.proc_get_link(inode, &nd->path); |
1da177e4 LT |
1331 | nd->last_type = LAST_BIND; |
1332 | out: | |
008b150a | 1333 | return ERR_PTR(error); |
1da177e4 LT |
1334 | } |
1335 | ||
3dcd25f3 | 1336 | static int do_proc_readlink(struct path *path, char __user *buffer, int buflen) |
1da177e4 | 1337 | { |
e12ba74d | 1338 | char *tmp = (char*)__get_free_page(GFP_TEMPORARY); |
3dcd25f3 | 1339 | char *pathname; |
1da177e4 LT |
1340 | int len; |
1341 | ||
1342 | if (!tmp) | |
1343 | return -ENOMEM; | |
0c28f287 | 1344 | |
cf28b486 | 1345 | pathname = d_path(path, tmp, PAGE_SIZE); |
3dcd25f3 JB |
1346 | len = PTR_ERR(pathname); |
1347 | if (IS_ERR(pathname)) | |
1da177e4 | 1348 | goto out; |
3dcd25f3 | 1349 | len = tmp + PAGE_SIZE - 1 - pathname; |
1da177e4 LT |
1350 | |
1351 | if (len > buflen) | |
1352 | len = buflen; | |
3dcd25f3 | 1353 | if (copy_to_user(buffer, pathname, len)) |
1da177e4 LT |
1354 | len = -EFAULT; |
1355 | out: | |
1356 | free_page((unsigned long)tmp); | |
1357 | return len; | |
1358 | } | |
1359 | ||
1360 | static int proc_pid_readlink(struct dentry * dentry, char __user * buffer, int buflen) | |
1361 | { | |
1362 | int error = -EACCES; | |
1363 | struct inode *inode = dentry->d_inode; | |
3dcd25f3 | 1364 | struct path path; |
1da177e4 | 1365 | |
778c1144 EB |
1366 | /* Are we allowed to snoop on the tasks file descriptors? */ |
1367 | if (!proc_fd_access_allowed(inode)) | |
1da177e4 | 1368 | goto out; |
1da177e4 | 1369 | |
3dcd25f3 | 1370 | error = PROC_I(inode)->op.proc_get_link(inode, &path); |
1da177e4 LT |
1371 | if (error) |
1372 | goto out; | |
1373 | ||
3dcd25f3 JB |
1374 | error = do_proc_readlink(&path, buffer, buflen); |
1375 | path_put(&path); | |
1da177e4 | 1376 | out: |
1da177e4 LT |
1377 | return error; |
1378 | } | |
1379 | ||
c5ef1c42 | 1380 | static const struct inode_operations proc_pid_link_inode_operations = { |
1da177e4 | 1381 | .readlink = proc_pid_readlink, |
6d76fa58 LT |
1382 | .follow_link = proc_pid_follow_link, |
1383 | .setattr = proc_setattr, | |
1da177e4 LT |
1384 | }; |
1385 | ||
28a6d671 EB |
1386 | |
1387 | /* building an inode */ | |
1388 | ||
1389 | static int task_dumpable(struct task_struct *task) | |
1da177e4 | 1390 | { |
28a6d671 EB |
1391 | int dumpable = 0; |
1392 | struct mm_struct *mm; | |
1da177e4 | 1393 | |
28a6d671 EB |
1394 | task_lock(task); |
1395 | mm = task->mm; | |
1396 | if (mm) | |
6c5d5238 | 1397 | dumpable = get_dumpable(mm); |
28a6d671 EB |
1398 | task_unlock(task); |
1399 | if(dumpable == 1) | |
1400 | return 1; | |
1401 | return 0; | |
1402 | } | |
1da177e4 | 1403 | |
1da177e4 | 1404 | |
61a28784 | 1405 | static struct inode *proc_pid_make_inode(struct super_block * sb, struct task_struct *task) |
28a6d671 EB |
1406 | { |
1407 | struct inode * inode; | |
1408 | struct proc_inode *ei; | |
c69e8d9c | 1409 | const struct cred *cred; |
1da177e4 | 1410 | |
28a6d671 | 1411 | /* We need a new inode */ |
1da177e4 | 1412 | |
28a6d671 EB |
1413 | inode = new_inode(sb); |
1414 | if (!inode) | |
1415 | goto out; | |
1416 | ||
1417 | /* Common stuff */ | |
1418 | ei = PROC_I(inode); | |
1419 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; | |
28a6d671 EB |
1420 | inode->i_op = &proc_def_inode_operations; |
1421 | ||
1422 | /* | |
1423 | * grab the reference to task. | |
1424 | */ | |
1a657f78 | 1425 | ei->pid = get_task_pid(task, PIDTYPE_PID); |
28a6d671 EB |
1426 | if (!ei->pid) |
1427 | goto out_unlock; | |
1428 | ||
28a6d671 | 1429 | if (task_dumpable(task)) { |
c69e8d9c DH |
1430 | rcu_read_lock(); |
1431 | cred = __task_cred(task); | |
1432 | inode->i_uid = cred->euid; | |
1433 | inode->i_gid = cred->egid; | |
1434 | rcu_read_unlock(); | |
1da177e4 | 1435 | } |
28a6d671 EB |
1436 | security_task_to_inode(task, inode); |
1437 | ||
1da177e4 | 1438 | out: |
28a6d671 EB |
1439 | return inode; |
1440 | ||
1441 | out_unlock: | |
1442 | iput(inode); | |
1443 | return NULL; | |
1da177e4 LT |
1444 | } |
1445 | ||
28a6d671 | 1446 | static int pid_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) |
1da177e4 | 1447 | { |
1da177e4 | 1448 | struct inode *inode = dentry->d_inode; |
28a6d671 | 1449 | struct task_struct *task; |
c69e8d9c DH |
1450 | const struct cred *cred; |
1451 | ||
28a6d671 | 1452 | generic_fillattr(inode, stat); |
1da177e4 | 1453 | |
28a6d671 EB |
1454 | rcu_read_lock(); |
1455 | stat->uid = 0; | |
1456 | stat->gid = 0; | |
1457 | task = pid_task(proc_pid(inode), PIDTYPE_PID); | |
1458 | if (task) { | |
1459 | if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) || | |
1460 | task_dumpable(task)) { | |
c69e8d9c DH |
1461 | cred = __task_cred(task); |
1462 | stat->uid = cred->euid; | |
1463 | stat->gid = cred->egid; | |
1da177e4 LT |
1464 | } |
1465 | } | |
28a6d671 | 1466 | rcu_read_unlock(); |
d6e71144 | 1467 | return 0; |
1da177e4 LT |
1468 | } |
1469 | ||
1da177e4 LT |
1470 | /* dentry stuff */ |
1471 | ||
1472 | /* | |
1473 | * Exceptional case: normally we are not allowed to unhash a busy | |
1474 | * directory. In this case, however, we can do it - no aliasing problems | |
1475 | * due to the way we treat inodes. | |
1476 | * | |
1477 | * Rewrite the inode's ownerships here because the owning task may have | |
1478 | * performed a setuid(), etc. | |
99f89551 EB |
1479 | * |
1480 | * Before the /proc/pid/status file was created the only way to read | |
1481 | * the effective uid of a /process was to stat /proc/pid. Reading | |
1482 | * /proc/pid/status is slow enough that procps and other packages | |
1483 | * kept stating /proc/pid. To keep the rules in /proc simple I have | |
1484 | * made this apply to all per process world readable and executable | |
1485 | * directories. | |
1da177e4 LT |
1486 | */ |
1487 | static int pid_revalidate(struct dentry *dentry, struct nameidata *nd) | |
1488 | { | |
1489 | struct inode *inode = dentry->d_inode; | |
99f89551 | 1490 | struct task_struct *task = get_proc_task(inode); |
c69e8d9c DH |
1491 | const struct cred *cred; |
1492 | ||
99f89551 EB |
1493 | if (task) { |
1494 | if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) || | |
1495 | task_dumpable(task)) { | |
c69e8d9c DH |
1496 | rcu_read_lock(); |
1497 | cred = __task_cred(task); | |
1498 | inode->i_uid = cred->euid; | |
1499 | inode->i_gid = cred->egid; | |
1500 | rcu_read_unlock(); | |
1da177e4 LT |
1501 | } else { |
1502 | inode->i_uid = 0; | |
1503 | inode->i_gid = 0; | |
1504 | } | |
9ee8ab9f | 1505 | inode->i_mode &= ~(S_ISUID | S_ISGID); |
1da177e4 | 1506 | security_task_to_inode(task, inode); |
99f89551 | 1507 | put_task_struct(task); |
1da177e4 LT |
1508 | return 1; |
1509 | } | |
1510 | d_drop(dentry); | |
1511 | return 0; | |
1512 | } | |
1513 | ||
28a6d671 | 1514 | static int pid_delete_dentry(struct dentry * dentry) |
99f89551 | 1515 | { |
28a6d671 EB |
1516 | /* Is the task we represent dead? |
1517 | * If so, then don't put the dentry on the lru list, | |
1518 | * kill it immediately. | |
1519 | */ | |
1520 | return !proc_pid(dentry->d_inode)->tasks[PIDTYPE_PID].first; | |
1521 | } | |
1522 | ||
1523 | static struct dentry_operations pid_dentry_operations = | |
1524 | { | |
1525 | .d_revalidate = pid_revalidate, | |
1526 | .d_delete = pid_delete_dentry, | |
1527 | }; | |
1528 | ||
1529 | /* Lookups */ | |
1530 | ||
c5141e6d ED |
1531 | typedef struct dentry *instantiate_t(struct inode *, struct dentry *, |
1532 | struct task_struct *, const void *); | |
61a28784 | 1533 | |
1c0d04c9 EB |
1534 | /* |
1535 | * Fill a directory entry. | |
1536 | * | |
1537 | * If possible create the dcache entry and derive our inode number and | |
1538 | * file type from dcache entry. | |
1539 | * | |
1540 | * Since all of the proc inode numbers are dynamically generated, the inode | |
1541 | * numbers do not exist until the inode is cache. This means creating the | |
1542 | * the dcache entry in readdir is necessary to keep the inode numbers | |
1543 | * reported by readdir in sync with the inode numbers reported | |
1544 | * by stat. | |
1545 | */ | |
61a28784 EB |
1546 | static int proc_fill_cache(struct file *filp, void *dirent, filldir_t filldir, |
1547 | char *name, int len, | |
c5141e6d | 1548 | instantiate_t instantiate, struct task_struct *task, const void *ptr) |
61a28784 | 1549 | { |
2fddfeef | 1550 | struct dentry *child, *dir = filp->f_path.dentry; |
61a28784 EB |
1551 | struct inode *inode; |
1552 | struct qstr qname; | |
1553 | ino_t ino = 0; | |
1554 | unsigned type = DT_UNKNOWN; | |
1555 | ||
1556 | qname.name = name; | |
1557 | qname.len = len; | |
1558 | qname.hash = full_name_hash(name, len); | |
1559 | ||
1560 | child = d_lookup(dir, &qname); | |
1561 | if (!child) { | |
1562 | struct dentry *new; | |
1563 | new = d_alloc(dir, &qname); | |
1564 | if (new) { | |
1565 | child = instantiate(dir->d_inode, new, task, ptr); | |
1566 | if (child) | |
1567 | dput(new); | |
1568 | else | |
1569 | child = new; | |
1570 | } | |
1571 | } | |
1572 | if (!child || IS_ERR(child) || !child->d_inode) | |
1573 | goto end_instantiate; | |
1574 | inode = child->d_inode; | |
1575 | if (inode) { | |
1576 | ino = inode->i_ino; | |
1577 | type = inode->i_mode >> 12; | |
1578 | } | |
1579 | dput(child); | |
1580 | end_instantiate: | |
1581 | if (!ino) | |
1582 | ino = find_inode_number(dir, &qname); | |
1583 | if (!ino) | |
1584 | ino = 1; | |
1585 | return filldir(dirent, name, len, filp->f_pos, ino, type); | |
1586 | } | |
1587 | ||
28a6d671 EB |
1588 | static unsigned name_to_int(struct dentry *dentry) |
1589 | { | |
1590 | const char *name = dentry->d_name.name; | |
1591 | int len = dentry->d_name.len; | |
1592 | unsigned n = 0; | |
1593 | ||
1594 | if (len > 1 && *name == '0') | |
1595 | goto out; | |
1596 | while (len-- > 0) { | |
1597 | unsigned c = *name++ - '0'; | |
1598 | if (c > 9) | |
1599 | goto out; | |
1600 | if (n >= (~0U-9)/10) | |
1601 | goto out; | |
1602 | n *= 10; | |
1603 | n += c; | |
1604 | } | |
1605 | return n; | |
1606 | out: | |
1607 | return ~0U; | |
1608 | } | |
1609 | ||
27932742 MS |
1610 | #define PROC_FDINFO_MAX 64 |
1611 | ||
3dcd25f3 | 1612 | static int proc_fd_info(struct inode *inode, struct path *path, char *info) |
28a6d671 EB |
1613 | { |
1614 | struct task_struct *task = get_proc_task(inode); | |
1615 | struct files_struct *files = NULL; | |
1616 | struct file *file; | |
1617 | int fd = proc_fd(inode); | |
99f89551 | 1618 | |
99f89551 | 1619 | if (task) { |
28a6d671 EB |
1620 | files = get_files_struct(task); |
1621 | put_task_struct(task); | |
1622 | } | |
1623 | if (files) { | |
1624 | /* | |
1625 | * We are not taking a ref to the file structure, so we must | |
1626 | * hold ->file_lock. | |
1627 | */ | |
1628 | spin_lock(&files->file_lock); | |
1629 | file = fcheck_files(files, fd); | |
1630 | if (file) { | |
3dcd25f3 JB |
1631 | if (path) { |
1632 | *path = file->f_path; | |
1633 | path_get(&file->f_path); | |
1634 | } | |
27932742 MS |
1635 | if (info) |
1636 | snprintf(info, PROC_FDINFO_MAX, | |
1637 | "pos:\t%lli\n" | |
1638 | "flags:\t0%o\n", | |
1639 | (long long) file->f_pos, | |
1640 | file->f_flags); | |
28a6d671 EB |
1641 | spin_unlock(&files->file_lock); |
1642 | put_files_struct(files); | |
1643 | return 0; | |
99f89551 | 1644 | } |
28a6d671 EB |
1645 | spin_unlock(&files->file_lock); |
1646 | put_files_struct(files); | |
99f89551 | 1647 | } |
28a6d671 | 1648 | return -ENOENT; |
99f89551 EB |
1649 | } |
1650 | ||
3dcd25f3 | 1651 | static int proc_fd_link(struct inode *inode, struct path *path) |
27932742 | 1652 | { |
3dcd25f3 | 1653 | return proc_fd_info(inode, path, NULL); |
27932742 MS |
1654 | } |
1655 | ||
1da177e4 LT |
1656 | static int tid_fd_revalidate(struct dentry *dentry, struct nameidata *nd) |
1657 | { | |
1658 | struct inode *inode = dentry->d_inode; | |
99f89551 | 1659 | struct task_struct *task = get_proc_task(inode); |
aed7a6c4 | 1660 | int fd = proc_fd(inode); |
1da177e4 | 1661 | struct files_struct *files; |
c69e8d9c | 1662 | const struct cred *cred; |
1da177e4 | 1663 | |
99f89551 EB |
1664 | if (task) { |
1665 | files = get_files_struct(task); | |
1666 | if (files) { | |
1667 | rcu_read_lock(); | |
1668 | if (fcheck_files(files, fd)) { | |
1669 | rcu_read_unlock(); | |
1670 | put_files_struct(files); | |
1671 | if (task_dumpable(task)) { | |
c69e8d9c DH |
1672 | rcu_read_lock(); |
1673 | cred = __task_cred(task); | |
1674 | inode->i_uid = cred->euid; | |
1675 | inode->i_gid = cred->egid; | |
1676 | rcu_read_unlock(); | |
99f89551 EB |
1677 | } else { |
1678 | inode->i_uid = 0; | |
1679 | inode->i_gid = 0; | |
1680 | } | |
9ee8ab9f | 1681 | inode->i_mode &= ~(S_ISUID | S_ISGID); |
99f89551 EB |
1682 | security_task_to_inode(task, inode); |
1683 | put_task_struct(task); | |
1684 | return 1; | |
1685 | } | |
b835996f | 1686 | rcu_read_unlock(); |
1da177e4 | 1687 | put_files_struct(files); |
1da177e4 | 1688 | } |
99f89551 | 1689 | put_task_struct(task); |
1da177e4 LT |
1690 | } |
1691 | d_drop(dentry); | |
1692 | return 0; | |
1693 | } | |
1694 | ||
1da177e4 LT |
1695 | static struct dentry_operations tid_fd_dentry_operations = |
1696 | { | |
1697 | .d_revalidate = tid_fd_revalidate, | |
1698 | .d_delete = pid_delete_dentry, | |
1699 | }; | |
1700 | ||
444ceed8 | 1701 | static struct dentry *proc_fd_instantiate(struct inode *dir, |
c5141e6d | 1702 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
1da177e4 | 1703 | { |
c5141e6d | 1704 | unsigned fd = *(const unsigned *)ptr; |
444ceed8 EB |
1705 | struct file *file; |
1706 | struct files_struct *files; | |
1707 | struct inode *inode; | |
1708 | struct proc_inode *ei; | |
1709 | struct dentry *error = ERR_PTR(-ENOENT); | |
1da177e4 | 1710 | |
61a28784 | 1711 | inode = proc_pid_make_inode(dir->i_sb, task); |
1da177e4 LT |
1712 | if (!inode) |
1713 | goto out; | |
1714 | ei = PROC_I(inode); | |
aed7a6c4 | 1715 | ei->fd = fd; |
1da177e4 LT |
1716 | files = get_files_struct(task); |
1717 | if (!files) | |
444ceed8 | 1718 | goto out_iput; |
1da177e4 | 1719 | inode->i_mode = S_IFLNK; |
ca99c1da DS |
1720 | |
1721 | /* | |
1722 | * We are not taking a ref to the file structure, so we must | |
1723 | * hold ->file_lock. | |
1724 | */ | |
1725 | spin_lock(&files->file_lock); | |
1da177e4 LT |
1726 | file = fcheck_files(files, fd); |
1727 | if (!file) | |
444ceed8 | 1728 | goto out_unlock; |
aeb5d727 | 1729 | if (file->f_mode & FMODE_READ) |
1da177e4 | 1730 | inode->i_mode |= S_IRUSR | S_IXUSR; |
aeb5d727 | 1731 | if (file->f_mode & FMODE_WRITE) |
1da177e4 | 1732 | inode->i_mode |= S_IWUSR | S_IXUSR; |
ca99c1da | 1733 | spin_unlock(&files->file_lock); |
1da177e4 | 1734 | put_files_struct(files); |
444ceed8 | 1735 | |
1da177e4 LT |
1736 | inode->i_op = &proc_pid_link_inode_operations; |
1737 | inode->i_size = 64; | |
1738 | ei->op.proc_get_link = proc_fd_link; | |
1739 | dentry->d_op = &tid_fd_dentry_operations; | |
1740 | d_add(dentry, inode); | |
cd6a3ce9 EB |
1741 | /* Close the race of the process dying before we return the dentry */ |
1742 | if (tid_fd_revalidate(dentry, NULL)) | |
444ceed8 | 1743 | error = NULL; |
1da177e4 | 1744 | |
444ceed8 EB |
1745 | out: |
1746 | return error; | |
1747 | out_unlock: | |
ca99c1da | 1748 | spin_unlock(&files->file_lock); |
1da177e4 | 1749 | put_files_struct(files); |
444ceed8 | 1750 | out_iput: |
1da177e4 | 1751 | iput(inode); |
cd6a3ce9 | 1752 | goto out; |
1da177e4 LT |
1753 | } |
1754 | ||
27932742 MS |
1755 | static struct dentry *proc_lookupfd_common(struct inode *dir, |
1756 | struct dentry *dentry, | |
1757 | instantiate_t instantiate) | |
444ceed8 EB |
1758 | { |
1759 | struct task_struct *task = get_proc_task(dir); | |
1760 | unsigned fd = name_to_int(dentry); | |
1761 | struct dentry *result = ERR_PTR(-ENOENT); | |
1762 | ||
1763 | if (!task) | |
1764 | goto out_no_task; | |
1765 | if (fd == ~0U) | |
1766 | goto out; | |
1767 | ||
27932742 | 1768 | result = instantiate(dir, dentry, task, &fd); |
444ceed8 EB |
1769 | out: |
1770 | put_task_struct(task); | |
1771 | out_no_task: | |
1772 | return result; | |
1773 | } | |
1774 | ||
27932742 MS |
1775 | static int proc_readfd_common(struct file * filp, void * dirent, |
1776 | filldir_t filldir, instantiate_t instantiate) | |
28a6d671 | 1777 | { |
2fddfeef | 1778 | struct dentry *dentry = filp->f_path.dentry; |
28a6d671 EB |
1779 | struct inode *inode = dentry->d_inode; |
1780 | struct task_struct *p = get_proc_task(inode); | |
457c2510 | 1781 | unsigned int fd, ino; |
28a6d671 | 1782 | int retval; |
28a6d671 | 1783 | struct files_struct * files; |
1da177e4 | 1784 | |
28a6d671 EB |
1785 | retval = -ENOENT; |
1786 | if (!p) | |
1787 | goto out_no_task; | |
1788 | retval = 0; | |
28a6d671 EB |
1789 | |
1790 | fd = filp->f_pos; | |
1791 | switch (fd) { | |
1792 | case 0: | |
1793 | if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0) | |
1794 | goto out; | |
1795 | filp->f_pos++; | |
1796 | case 1: | |
1797 | ino = parent_ino(dentry); | |
1798 | if (filldir(dirent, "..", 2, 1, ino, DT_DIR) < 0) | |
1799 | goto out; | |
1800 | filp->f_pos++; | |
1801 | default: | |
1802 | files = get_files_struct(p); | |
1803 | if (!files) | |
1804 | goto out; | |
1805 | rcu_read_lock(); | |
28a6d671 | 1806 | for (fd = filp->f_pos-2; |
9b4f526c | 1807 | fd < files_fdtable(files)->max_fds; |
28a6d671 | 1808 | fd++, filp->f_pos++) { |
27932742 MS |
1809 | char name[PROC_NUMBUF]; |
1810 | int len; | |
28a6d671 EB |
1811 | |
1812 | if (!fcheck_files(files, fd)) | |
1813 | continue; | |
1814 | rcu_read_unlock(); | |
1815 | ||
27932742 MS |
1816 | len = snprintf(name, sizeof(name), "%d", fd); |
1817 | if (proc_fill_cache(filp, dirent, filldir, | |
1818 | name, len, instantiate, | |
1819 | p, &fd) < 0) { | |
28a6d671 EB |
1820 | rcu_read_lock(); |
1821 | break; | |
1822 | } | |
1823 | rcu_read_lock(); | |
1824 | } | |
1825 | rcu_read_unlock(); | |
1826 | put_files_struct(files); | |
1827 | } | |
1828 | out: | |
1829 | put_task_struct(p); | |
1830 | out_no_task: | |
1831 | return retval; | |
1832 | } | |
1833 | ||
27932742 MS |
1834 | static struct dentry *proc_lookupfd(struct inode *dir, struct dentry *dentry, |
1835 | struct nameidata *nd) | |
1836 | { | |
1837 | return proc_lookupfd_common(dir, dentry, proc_fd_instantiate); | |
1838 | } | |
1839 | ||
1840 | static int proc_readfd(struct file *filp, void *dirent, filldir_t filldir) | |
1841 | { | |
1842 | return proc_readfd_common(filp, dirent, filldir, proc_fd_instantiate); | |
1843 | } | |
1844 | ||
1845 | static ssize_t proc_fdinfo_read(struct file *file, char __user *buf, | |
1846 | size_t len, loff_t *ppos) | |
1847 | { | |
1848 | char tmp[PROC_FDINFO_MAX]; | |
3dcd25f3 | 1849 | int err = proc_fd_info(file->f_path.dentry->d_inode, NULL, tmp); |
27932742 MS |
1850 | if (!err) |
1851 | err = simple_read_from_buffer(buf, len, ppos, tmp, strlen(tmp)); | |
1852 | return err; | |
1853 | } | |
1854 | ||
1855 | static const struct file_operations proc_fdinfo_file_operations = { | |
1856 | .open = nonseekable_open, | |
1857 | .read = proc_fdinfo_read, | |
1858 | }; | |
1859 | ||
00977a59 | 1860 | static const struct file_operations proc_fd_operations = { |
28a6d671 EB |
1861 | .read = generic_read_dir, |
1862 | .readdir = proc_readfd, | |
1da177e4 LT |
1863 | }; |
1864 | ||
8948e11f AD |
1865 | /* |
1866 | * /proc/pid/fd needs a special permission handler so that a process can still | |
1867 | * access /proc/self/fd after it has executed a setuid(). | |
1868 | */ | |
e6305c43 | 1869 | static int proc_fd_permission(struct inode *inode, int mask) |
8948e11f AD |
1870 | { |
1871 | int rv; | |
1872 | ||
1873 | rv = generic_permission(inode, mask, NULL); | |
1874 | if (rv == 0) | |
1875 | return 0; | |
1876 | if (task_pid(current) == proc_pid(inode)) | |
1877 | rv = 0; | |
1878 | return rv; | |
1879 | } | |
1880 | ||
1da177e4 LT |
1881 | /* |
1882 | * proc directories can do almost nothing.. | |
1883 | */ | |
c5ef1c42 | 1884 | static const struct inode_operations proc_fd_inode_operations = { |
1da177e4 | 1885 | .lookup = proc_lookupfd, |
8948e11f | 1886 | .permission = proc_fd_permission, |
6d76fa58 | 1887 | .setattr = proc_setattr, |
1da177e4 LT |
1888 | }; |
1889 | ||
27932742 MS |
1890 | static struct dentry *proc_fdinfo_instantiate(struct inode *dir, |
1891 | struct dentry *dentry, struct task_struct *task, const void *ptr) | |
1892 | { | |
1893 | unsigned fd = *(unsigned *)ptr; | |
1894 | struct inode *inode; | |
1895 | struct proc_inode *ei; | |
1896 | struct dentry *error = ERR_PTR(-ENOENT); | |
1897 | ||
1898 | inode = proc_pid_make_inode(dir->i_sb, task); | |
1899 | if (!inode) | |
1900 | goto out; | |
1901 | ei = PROC_I(inode); | |
1902 | ei->fd = fd; | |
1903 | inode->i_mode = S_IFREG | S_IRUSR; | |
1904 | inode->i_fop = &proc_fdinfo_file_operations; | |
1905 | dentry->d_op = &tid_fd_dentry_operations; | |
1906 | d_add(dentry, inode); | |
1907 | /* Close the race of the process dying before we return the dentry */ | |
1908 | if (tid_fd_revalidate(dentry, NULL)) | |
1909 | error = NULL; | |
1910 | ||
1911 | out: | |
1912 | return error; | |
1913 | } | |
1914 | ||
1915 | static struct dentry *proc_lookupfdinfo(struct inode *dir, | |
1916 | struct dentry *dentry, | |
1917 | struct nameidata *nd) | |
1918 | { | |
1919 | return proc_lookupfd_common(dir, dentry, proc_fdinfo_instantiate); | |
1920 | } | |
1921 | ||
1922 | static int proc_readfdinfo(struct file *filp, void *dirent, filldir_t filldir) | |
1923 | { | |
1924 | return proc_readfd_common(filp, dirent, filldir, | |
1925 | proc_fdinfo_instantiate); | |
1926 | } | |
1927 | ||
1928 | static const struct file_operations proc_fdinfo_operations = { | |
1929 | .read = generic_read_dir, | |
1930 | .readdir = proc_readfdinfo, | |
1931 | }; | |
1932 | ||
1933 | /* | |
1934 | * proc directories can do almost nothing.. | |
1935 | */ | |
1936 | static const struct inode_operations proc_fdinfo_inode_operations = { | |
1937 | .lookup = proc_lookupfdinfo, | |
1938 | .setattr = proc_setattr, | |
1939 | }; | |
1940 | ||
1941 | ||
444ceed8 | 1942 | static struct dentry *proc_pident_instantiate(struct inode *dir, |
c5141e6d | 1943 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
444ceed8 | 1944 | { |
c5141e6d | 1945 | const struct pid_entry *p = ptr; |
444ceed8 EB |
1946 | struct inode *inode; |
1947 | struct proc_inode *ei; | |
1948 | struct dentry *error = ERR_PTR(-EINVAL); | |
1949 | ||
61a28784 | 1950 | inode = proc_pid_make_inode(dir->i_sb, task); |
444ceed8 EB |
1951 | if (!inode) |
1952 | goto out; | |
1953 | ||
1954 | ei = PROC_I(inode); | |
1955 | inode->i_mode = p->mode; | |
1956 | if (S_ISDIR(inode->i_mode)) | |
1957 | inode->i_nlink = 2; /* Use getattr to fix if necessary */ | |
1958 | if (p->iop) | |
1959 | inode->i_op = p->iop; | |
1960 | if (p->fop) | |
1961 | inode->i_fop = p->fop; | |
1962 | ei->op = p->op; | |
1963 | dentry->d_op = &pid_dentry_operations; | |
1964 | d_add(dentry, inode); | |
1965 | /* Close the race of the process dying before we return the dentry */ | |
1966 | if (pid_revalidate(dentry, NULL)) | |
1967 | error = NULL; | |
1968 | out: | |
1969 | return error; | |
1970 | } | |
1971 | ||
1da177e4 LT |
1972 | static struct dentry *proc_pident_lookup(struct inode *dir, |
1973 | struct dentry *dentry, | |
c5141e6d | 1974 | const struct pid_entry *ents, |
7bcd6b0e | 1975 | unsigned int nents) |
1da177e4 LT |
1976 | { |
1977 | struct inode *inode; | |
cd6a3ce9 | 1978 | struct dentry *error; |
99f89551 | 1979 | struct task_struct *task = get_proc_task(dir); |
c5141e6d | 1980 | const struct pid_entry *p, *last; |
1da177e4 | 1981 | |
cd6a3ce9 | 1982 | error = ERR_PTR(-ENOENT); |
1da177e4 LT |
1983 | inode = NULL; |
1984 | ||
99f89551 EB |
1985 | if (!task) |
1986 | goto out_no_task; | |
1da177e4 | 1987 | |
20cdc894 EB |
1988 | /* |
1989 | * Yes, it does not scale. And it should not. Don't add | |
1990 | * new entries into /proc/<tgid>/ without very good reasons. | |
1991 | */ | |
7bcd6b0e EB |
1992 | last = &ents[nents - 1]; |
1993 | for (p = ents; p <= last; p++) { | |
1da177e4 LT |
1994 | if (p->len != dentry->d_name.len) |
1995 | continue; | |
1996 | if (!memcmp(dentry->d_name.name, p->name, p->len)) | |
1997 | break; | |
1998 | } | |
7bcd6b0e | 1999 | if (p > last) |
1da177e4 LT |
2000 | goto out; |
2001 | ||
444ceed8 | 2002 | error = proc_pident_instantiate(dir, dentry, task, p); |
1da177e4 | 2003 | out: |
99f89551 EB |
2004 | put_task_struct(task); |
2005 | out_no_task: | |
cd6a3ce9 | 2006 | return error; |
1da177e4 LT |
2007 | } |
2008 | ||
c5141e6d ED |
2009 | static int proc_pident_fill_cache(struct file *filp, void *dirent, |
2010 | filldir_t filldir, struct task_struct *task, const struct pid_entry *p) | |
61a28784 EB |
2011 | { |
2012 | return proc_fill_cache(filp, dirent, filldir, p->name, p->len, | |
2013 | proc_pident_instantiate, task, p); | |
2014 | } | |
2015 | ||
28a6d671 EB |
2016 | static int proc_pident_readdir(struct file *filp, |
2017 | void *dirent, filldir_t filldir, | |
c5141e6d | 2018 | const struct pid_entry *ents, unsigned int nents) |
28a6d671 EB |
2019 | { |
2020 | int i; | |
2fddfeef | 2021 | struct dentry *dentry = filp->f_path.dentry; |
28a6d671 EB |
2022 | struct inode *inode = dentry->d_inode; |
2023 | struct task_struct *task = get_proc_task(inode); | |
c5141e6d | 2024 | const struct pid_entry *p, *last; |
28a6d671 EB |
2025 | ino_t ino; |
2026 | int ret; | |
2027 | ||
2028 | ret = -ENOENT; | |
2029 | if (!task) | |
61a28784 | 2030 | goto out_no_task; |
28a6d671 EB |
2031 | |
2032 | ret = 0; | |
28a6d671 EB |
2033 | i = filp->f_pos; |
2034 | switch (i) { | |
2035 | case 0: | |
2036 | ino = inode->i_ino; | |
2037 | if (filldir(dirent, ".", 1, i, ino, DT_DIR) < 0) | |
2038 | goto out; | |
2039 | i++; | |
2040 | filp->f_pos++; | |
2041 | /* fall through */ | |
2042 | case 1: | |
2043 | ino = parent_ino(dentry); | |
2044 | if (filldir(dirent, "..", 2, i, ino, DT_DIR) < 0) | |
2045 | goto out; | |
2046 | i++; | |
2047 | filp->f_pos++; | |
2048 | /* fall through */ | |
2049 | default: | |
2050 | i -= 2; | |
2051 | if (i >= nents) { | |
2052 | ret = 1; | |
2053 | goto out; | |
2054 | } | |
2055 | p = ents + i; | |
7bcd6b0e EB |
2056 | last = &ents[nents - 1]; |
2057 | while (p <= last) { | |
61a28784 | 2058 | if (proc_pident_fill_cache(filp, dirent, filldir, task, p) < 0) |
28a6d671 EB |
2059 | goto out; |
2060 | filp->f_pos++; | |
2061 | p++; | |
2062 | } | |
2063 | } | |
2064 | ||
2065 | ret = 1; | |
2066 | out: | |
61a28784 EB |
2067 | put_task_struct(task); |
2068 | out_no_task: | |
28a6d671 | 2069 | return ret; |
1da177e4 LT |
2070 | } |
2071 | ||
28a6d671 EB |
2072 | #ifdef CONFIG_SECURITY |
2073 | static ssize_t proc_pid_attr_read(struct file * file, char __user * buf, | |
2074 | size_t count, loff_t *ppos) | |
2075 | { | |
2fddfeef | 2076 | struct inode * inode = file->f_path.dentry->d_inode; |
04ff9708 | 2077 | char *p = NULL; |
28a6d671 EB |
2078 | ssize_t length; |
2079 | struct task_struct *task = get_proc_task(inode); | |
2080 | ||
28a6d671 | 2081 | if (!task) |
04ff9708 | 2082 | return -ESRCH; |
28a6d671 EB |
2083 | |
2084 | length = security_getprocattr(task, | |
2fddfeef | 2085 | (char*)file->f_path.dentry->d_name.name, |
04ff9708 | 2086 | &p); |
28a6d671 | 2087 | put_task_struct(task); |
04ff9708 AV |
2088 | if (length > 0) |
2089 | length = simple_read_from_buffer(buf, count, ppos, p, length); | |
2090 | kfree(p); | |
28a6d671 | 2091 | return length; |
1da177e4 LT |
2092 | } |
2093 | ||
28a6d671 EB |
2094 | static ssize_t proc_pid_attr_write(struct file * file, const char __user * buf, |
2095 | size_t count, loff_t *ppos) | |
2096 | { | |
2fddfeef | 2097 | struct inode * inode = file->f_path.dentry->d_inode; |
28a6d671 EB |
2098 | char *page; |
2099 | ssize_t length; | |
2100 | struct task_struct *task = get_proc_task(inode); | |
2101 | ||
2102 | length = -ESRCH; | |
2103 | if (!task) | |
2104 | goto out_no_task; | |
2105 | if (count > PAGE_SIZE) | |
2106 | count = PAGE_SIZE; | |
2107 | ||
2108 | /* No partial writes. */ | |
2109 | length = -EINVAL; | |
2110 | if (*ppos != 0) | |
2111 | goto out; | |
2112 | ||
2113 | length = -ENOMEM; | |
e12ba74d | 2114 | page = (char*)__get_free_page(GFP_TEMPORARY); |
28a6d671 EB |
2115 | if (!page) |
2116 | goto out; | |
2117 | ||
2118 | length = -EFAULT; | |
2119 | if (copy_from_user(page, buf, count)) | |
2120 | goto out_free; | |
2121 | ||
2122 | length = security_setprocattr(task, | |
2fddfeef | 2123 | (char*)file->f_path.dentry->d_name.name, |
28a6d671 EB |
2124 | (void*)page, count); |
2125 | out_free: | |
2126 | free_page((unsigned long) page); | |
2127 | out: | |
2128 | put_task_struct(task); | |
2129 | out_no_task: | |
2130 | return length; | |
2131 | } | |
2132 | ||
00977a59 | 2133 | static const struct file_operations proc_pid_attr_operations = { |
28a6d671 EB |
2134 | .read = proc_pid_attr_read, |
2135 | .write = proc_pid_attr_write, | |
2136 | }; | |
2137 | ||
c5141e6d | 2138 | static const struct pid_entry attr_dir_stuff[] = { |
61a28784 EB |
2139 | REG("current", S_IRUGO|S_IWUGO, pid_attr), |
2140 | REG("prev", S_IRUGO, pid_attr), | |
2141 | REG("exec", S_IRUGO|S_IWUGO, pid_attr), | |
2142 | REG("fscreate", S_IRUGO|S_IWUGO, pid_attr), | |
2143 | REG("keycreate", S_IRUGO|S_IWUGO, pid_attr), | |
2144 | REG("sockcreate", S_IRUGO|S_IWUGO, pid_attr), | |
28a6d671 EB |
2145 | }; |
2146 | ||
72d9dcfc | 2147 | static int proc_attr_dir_readdir(struct file * filp, |
28a6d671 EB |
2148 | void * dirent, filldir_t filldir) |
2149 | { | |
2150 | return proc_pident_readdir(filp,dirent,filldir, | |
72d9dcfc | 2151 | attr_dir_stuff,ARRAY_SIZE(attr_dir_stuff)); |
28a6d671 EB |
2152 | } |
2153 | ||
00977a59 | 2154 | static const struct file_operations proc_attr_dir_operations = { |
1da177e4 | 2155 | .read = generic_read_dir, |
72d9dcfc | 2156 | .readdir = proc_attr_dir_readdir, |
1da177e4 LT |
2157 | }; |
2158 | ||
72d9dcfc | 2159 | static struct dentry *proc_attr_dir_lookup(struct inode *dir, |
28a6d671 EB |
2160 | struct dentry *dentry, struct nameidata *nd) |
2161 | { | |
7bcd6b0e EB |
2162 | return proc_pident_lookup(dir, dentry, |
2163 | attr_dir_stuff, ARRAY_SIZE(attr_dir_stuff)); | |
28a6d671 EB |
2164 | } |
2165 | ||
c5ef1c42 | 2166 | static const struct inode_operations proc_attr_dir_inode_operations = { |
72d9dcfc | 2167 | .lookup = proc_attr_dir_lookup, |
99f89551 | 2168 | .getattr = pid_getattr, |
6d76fa58 | 2169 | .setattr = proc_setattr, |
1da177e4 LT |
2170 | }; |
2171 | ||
28a6d671 EB |
2172 | #endif |
2173 | ||
3cb4a0bb KH |
2174 | #if defined(USE_ELF_CORE_DUMP) && defined(CONFIG_ELF_CORE) |
2175 | static ssize_t proc_coredump_filter_read(struct file *file, char __user *buf, | |
2176 | size_t count, loff_t *ppos) | |
2177 | { | |
2178 | struct task_struct *task = get_proc_task(file->f_dentry->d_inode); | |
2179 | struct mm_struct *mm; | |
2180 | char buffer[PROC_NUMBUF]; | |
2181 | size_t len; | |
2182 | int ret; | |
2183 | ||
2184 | if (!task) | |
2185 | return -ESRCH; | |
2186 | ||
2187 | ret = 0; | |
2188 | mm = get_task_mm(task); | |
2189 | if (mm) { | |
2190 | len = snprintf(buffer, sizeof(buffer), "%08lx\n", | |
2191 | ((mm->flags & MMF_DUMP_FILTER_MASK) >> | |
2192 | MMF_DUMP_FILTER_SHIFT)); | |
2193 | mmput(mm); | |
2194 | ret = simple_read_from_buffer(buf, count, ppos, buffer, len); | |
2195 | } | |
2196 | ||
2197 | put_task_struct(task); | |
2198 | ||
2199 | return ret; | |
2200 | } | |
2201 | ||
2202 | static ssize_t proc_coredump_filter_write(struct file *file, | |
2203 | const char __user *buf, | |
2204 | size_t count, | |
2205 | loff_t *ppos) | |
2206 | { | |
2207 | struct task_struct *task; | |
2208 | struct mm_struct *mm; | |
2209 | char buffer[PROC_NUMBUF], *end; | |
2210 | unsigned int val; | |
2211 | int ret; | |
2212 | int i; | |
2213 | unsigned long mask; | |
2214 | ||
2215 | ret = -EFAULT; | |
2216 | memset(buffer, 0, sizeof(buffer)); | |
2217 | if (count > sizeof(buffer) - 1) | |
2218 | count = sizeof(buffer) - 1; | |
2219 | if (copy_from_user(buffer, buf, count)) | |
2220 | goto out_no_task; | |
2221 | ||
2222 | ret = -EINVAL; | |
2223 | val = (unsigned int)simple_strtoul(buffer, &end, 0); | |
2224 | if (*end == '\n') | |
2225 | end++; | |
2226 | if (end - buffer == 0) | |
2227 | goto out_no_task; | |
2228 | ||
2229 | ret = -ESRCH; | |
2230 | task = get_proc_task(file->f_dentry->d_inode); | |
2231 | if (!task) | |
2232 | goto out_no_task; | |
2233 | ||
2234 | ret = end - buffer; | |
2235 | mm = get_task_mm(task); | |
2236 | if (!mm) | |
2237 | goto out_no_mm; | |
2238 | ||
2239 | for (i = 0, mask = 1; i < MMF_DUMP_FILTER_BITS; i++, mask <<= 1) { | |
2240 | if (val & mask) | |
2241 | set_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags); | |
2242 | else | |
2243 | clear_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags); | |
2244 | } | |
2245 | ||
2246 | mmput(mm); | |
2247 | out_no_mm: | |
2248 | put_task_struct(task); | |
2249 | out_no_task: | |
2250 | return ret; | |
2251 | } | |
2252 | ||
2253 | static const struct file_operations proc_coredump_filter_operations = { | |
2254 | .read = proc_coredump_filter_read, | |
2255 | .write = proc_coredump_filter_write, | |
2256 | }; | |
2257 | #endif | |
2258 | ||
28a6d671 EB |
2259 | /* |
2260 | * /proc/self: | |
2261 | */ | |
2262 | static int proc_self_readlink(struct dentry *dentry, char __user *buffer, | |
2263 | int buflen) | |
2264 | { | |
488e5bc4 | 2265 | struct pid_namespace *ns = dentry->d_sb->s_fs_info; |
b55fcb22 | 2266 | pid_t tgid = task_tgid_nr_ns(current, ns); |
28a6d671 | 2267 | char tmp[PROC_NUMBUF]; |
b55fcb22 | 2268 | if (!tgid) |
488e5bc4 | 2269 | return -ENOENT; |
b55fcb22 | 2270 | sprintf(tmp, "%d", tgid); |
28a6d671 EB |
2271 | return vfs_readlink(dentry,buffer,buflen,tmp); |
2272 | } | |
2273 | ||
2274 | static void *proc_self_follow_link(struct dentry *dentry, struct nameidata *nd) | |
2275 | { | |
488e5bc4 | 2276 | struct pid_namespace *ns = dentry->d_sb->s_fs_info; |
b55fcb22 | 2277 | pid_t tgid = task_tgid_nr_ns(current, ns); |
28a6d671 | 2278 | char tmp[PROC_NUMBUF]; |
b55fcb22 | 2279 | if (!tgid) |
488e5bc4 | 2280 | return ERR_PTR(-ENOENT); |
b55fcb22 | 2281 | sprintf(tmp, "%d", task_tgid_nr_ns(current, ns)); |
28a6d671 EB |
2282 | return ERR_PTR(vfs_follow_link(nd,tmp)); |
2283 | } | |
2284 | ||
c5ef1c42 | 2285 | static const struct inode_operations proc_self_inode_operations = { |
28a6d671 EB |
2286 | .readlink = proc_self_readlink, |
2287 | .follow_link = proc_self_follow_link, | |
2288 | }; | |
2289 | ||
801199ce EB |
2290 | /* |
2291 | * proc base | |
2292 | * | |
2293 | * These are the directory entries in the root directory of /proc | |
2294 | * that properly belong to the /proc filesystem, as they describe | |
2295 | * describe something that is process related. | |
2296 | */ | |
c5141e6d | 2297 | static const struct pid_entry proc_base_stuff[] = { |
61a28784 | 2298 | NOD("self", S_IFLNK|S_IRWXUGO, |
801199ce | 2299 | &proc_self_inode_operations, NULL, {}), |
801199ce EB |
2300 | }; |
2301 | ||
2302 | /* | |
2303 | * Exceptional case: normally we are not allowed to unhash a busy | |
2304 | * directory. In this case, however, we can do it - no aliasing problems | |
2305 | * due to the way we treat inodes. | |
2306 | */ | |
2307 | static int proc_base_revalidate(struct dentry *dentry, struct nameidata *nd) | |
2308 | { | |
2309 | struct inode *inode = dentry->d_inode; | |
2310 | struct task_struct *task = get_proc_task(inode); | |
2311 | if (task) { | |
2312 | put_task_struct(task); | |
2313 | return 1; | |
2314 | } | |
2315 | d_drop(dentry); | |
2316 | return 0; | |
2317 | } | |
2318 | ||
2319 | static struct dentry_operations proc_base_dentry_operations = | |
2320 | { | |
2321 | .d_revalidate = proc_base_revalidate, | |
2322 | .d_delete = pid_delete_dentry, | |
2323 | }; | |
2324 | ||
444ceed8 | 2325 | static struct dentry *proc_base_instantiate(struct inode *dir, |
c5141e6d | 2326 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
801199ce | 2327 | { |
c5141e6d | 2328 | const struct pid_entry *p = ptr; |
801199ce | 2329 | struct inode *inode; |
801199ce | 2330 | struct proc_inode *ei; |
444ceed8 | 2331 | struct dentry *error = ERR_PTR(-EINVAL); |
801199ce EB |
2332 | |
2333 | /* Allocate the inode */ | |
2334 | error = ERR_PTR(-ENOMEM); | |
2335 | inode = new_inode(dir->i_sb); | |
2336 | if (!inode) | |
2337 | goto out; | |
2338 | ||
2339 | /* Initialize the inode */ | |
2340 | ei = PROC_I(inode); | |
2341 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; | |
801199ce EB |
2342 | |
2343 | /* | |
2344 | * grab the reference to the task. | |
2345 | */ | |
1a657f78 | 2346 | ei->pid = get_task_pid(task, PIDTYPE_PID); |
801199ce EB |
2347 | if (!ei->pid) |
2348 | goto out_iput; | |
2349 | ||
801199ce EB |
2350 | inode->i_mode = p->mode; |
2351 | if (S_ISDIR(inode->i_mode)) | |
2352 | inode->i_nlink = 2; | |
2353 | if (S_ISLNK(inode->i_mode)) | |
2354 | inode->i_size = 64; | |
2355 | if (p->iop) | |
2356 | inode->i_op = p->iop; | |
2357 | if (p->fop) | |
2358 | inode->i_fop = p->fop; | |
2359 | ei->op = p->op; | |
2360 | dentry->d_op = &proc_base_dentry_operations; | |
2361 | d_add(dentry, inode); | |
2362 | error = NULL; | |
2363 | out: | |
801199ce EB |
2364 | return error; |
2365 | out_iput: | |
2366 | iput(inode); | |
2367 | goto out; | |
2368 | } | |
2369 | ||
444ceed8 EB |
2370 | static struct dentry *proc_base_lookup(struct inode *dir, struct dentry *dentry) |
2371 | { | |
2372 | struct dentry *error; | |
2373 | struct task_struct *task = get_proc_task(dir); | |
c5141e6d | 2374 | const struct pid_entry *p, *last; |
444ceed8 EB |
2375 | |
2376 | error = ERR_PTR(-ENOENT); | |
2377 | ||
2378 | if (!task) | |
2379 | goto out_no_task; | |
2380 | ||
2381 | /* Lookup the directory entry */ | |
7bcd6b0e EB |
2382 | last = &proc_base_stuff[ARRAY_SIZE(proc_base_stuff) - 1]; |
2383 | for (p = proc_base_stuff; p <= last; p++) { | |
444ceed8 EB |
2384 | if (p->len != dentry->d_name.len) |
2385 | continue; | |
2386 | if (!memcmp(dentry->d_name.name, p->name, p->len)) | |
2387 | break; | |
2388 | } | |
7bcd6b0e | 2389 | if (p > last) |
444ceed8 EB |
2390 | goto out; |
2391 | ||
2392 | error = proc_base_instantiate(dir, dentry, task, p); | |
2393 | ||
2394 | out: | |
2395 | put_task_struct(task); | |
2396 | out_no_task: | |
2397 | return error; | |
2398 | } | |
2399 | ||
c5141e6d ED |
2400 | static int proc_base_fill_cache(struct file *filp, void *dirent, |
2401 | filldir_t filldir, struct task_struct *task, const struct pid_entry *p) | |
61a28784 EB |
2402 | { |
2403 | return proc_fill_cache(filp, dirent, filldir, p->name, p->len, | |
2404 | proc_base_instantiate, task, p); | |
2405 | } | |
2406 | ||
aba76fdb | 2407 | #ifdef CONFIG_TASK_IO_ACCOUNTING |
297c5d92 AR |
2408 | static int do_io_accounting(struct task_struct *task, char *buffer, int whole) |
2409 | { | |
940389b8 | 2410 | struct task_io_accounting acct = task->ioac; |
5995477a AR |
2411 | unsigned long flags; |
2412 | ||
2413 | if (whole && lock_task_sighand(task, &flags)) { | |
2414 | struct task_struct *t = task; | |
2415 | ||
2416 | task_io_accounting_add(&acct, &task->signal->ioac); | |
2417 | while_each_thread(task, t) | |
2418 | task_io_accounting_add(&acct, &t->ioac); | |
2419 | ||
2420 | unlock_task_sighand(task, &flags); | |
297c5d92 | 2421 | } |
aba76fdb AM |
2422 | return sprintf(buffer, |
2423 | "rchar: %llu\n" | |
2424 | "wchar: %llu\n" | |
2425 | "syscr: %llu\n" | |
2426 | "syscw: %llu\n" | |
2427 | "read_bytes: %llu\n" | |
2428 | "write_bytes: %llu\n" | |
2429 | "cancelled_write_bytes: %llu\n", | |
7c44319d AB |
2430 | (unsigned long long)acct.rchar, |
2431 | (unsigned long long)acct.wchar, | |
2432 | (unsigned long long)acct.syscr, | |
2433 | (unsigned long long)acct.syscw, | |
2434 | (unsigned long long)acct.read_bytes, | |
2435 | (unsigned long long)acct.write_bytes, | |
2436 | (unsigned long long)acct.cancelled_write_bytes); | |
297c5d92 AR |
2437 | } |
2438 | ||
2439 | static int proc_tid_io_accounting(struct task_struct *task, char *buffer) | |
2440 | { | |
2441 | return do_io_accounting(task, buffer, 0); | |
aba76fdb | 2442 | } |
297c5d92 AR |
2443 | |
2444 | static int proc_tgid_io_accounting(struct task_struct *task, char *buffer) | |
2445 | { | |
2446 | return do_io_accounting(task, buffer, 1); | |
2447 | } | |
2448 | #endif /* CONFIG_TASK_IO_ACCOUNTING */ | |
aba76fdb | 2449 | |
47830723 KC |
2450 | static int proc_pid_personality(struct seq_file *m, struct pid_namespace *ns, |
2451 | struct pid *pid, struct task_struct *task) | |
2452 | { | |
2453 | seq_printf(m, "%08x\n", task->personality); | |
2454 | return 0; | |
2455 | } | |
2456 | ||
28a6d671 EB |
2457 | /* |
2458 | * Thread groups | |
2459 | */ | |
00977a59 | 2460 | static const struct file_operations proc_task_operations; |
c5ef1c42 | 2461 | static const struct inode_operations proc_task_inode_operations; |
20cdc894 | 2462 | |
c5141e6d | 2463 | static const struct pid_entry tgid_base_stuff[] = { |
61a28784 EB |
2464 | DIR("task", S_IRUGO|S_IXUGO, task), |
2465 | DIR("fd", S_IRUSR|S_IXUSR, fd), | |
27932742 | 2466 | DIR("fdinfo", S_IRUSR|S_IXUSR, fdinfo), |
b2211a36 | 2467 | #ifdef CONFIG_NET |
4f42c288 | 2468 | DIR("net", S_IRUGO|S_IXUGO, net), |
b2211a36 | 2469 | #endif |
315e28c8 | 2470 | REG("environ", S_IRUSR, environ), |
61a28784 | 2471 | INF("auxv", S_IRUSR, pid_auxv), |
df5f8314 | 2472 | ONE("status", S_IRUGO, pid_status), |
47830723 | 2473 | ONE("personality", S_IRUSR, pid_personality), |
d85f50d5 | 2474 | INF("limits", S_IRUSR, pid_limits), |
43ae34cb IM |
2475 | #ifdef CONFIG_SCHED_DEBUG |
2476 | REG("sched", S_IRUGO|S_IWUSR, pid_sched), | |
ebcb6734 RM |
2477 | #endif |
2478 | #ifdef CONFIG_HAVE_ARCH_TRACEHOOK | |
2479 | INF("syscall", S_IRUSR, pid_syscall), | |
43ae34cb | 2480 | #endif |
61a28784 | 2481 | INF("cmdline", S_IRUGO, pid_cmdline), |
ee992744 | 2482 | ONE("stat", S_IRUGO, tgid_stat), |
a56d3fc7 | 2483 | ONE("statm", S_IRUGO, pid_statm), |
61a28784 | 2484 | REG("maps", S_IRUGO, maps), |
28a6d671 | 2485 | #ifdef CONFIG_NUMA |
61a28784 | 2486 | REG("numa_maps", S_IRUGO, numa_maps), |
28a6d671 | 2487 | #endif |
61a28784 | 2488 | REG("mem", S_IRUSR|S_IWUSR, mem), |
61a28784 EB |
2489 | LNK("cwd", cwd), |
2490 | LNK("root", root), | |
2491 | LNK("exe", exe), | |
2492 | REG("mounts", S_IRUGO, mounts), | |
2d4d4864 | 2493 | REG("mountinfo", S_IRUGO, mountinfo), |
61a28784 | 2494 | REG("mountstats", S_IRUSR, mountstats), |
1e883281 | 2495 | #ifdef CONFIG_PROC_PAGE_MONITOR |
b813e931 | 2496 | REG("clear_refs", S_IWUSR, clear_refs), |
61a28784 | 2497 | REG("smaps", S_IRUGO, smaps), |
85863e47 | 2498 | REG("pagemap", S_IRUSR, pagemap), |
28a6d671 EB |
2499 | #endif |
2500 | #ifdef CONFIG_SECURITY | |
72d9dcfc | 2501 | DIR("attr", S_IRUGO|S_IXUGO, attr_dir), |
28a6d671 EB |
2502 | #endif |
2503 | #ifdef CONFIG_KALLSYMS | |
61a28784 | 2504 | INF("wchan", S_IRUGO, pid_wchan), |
28a6d671 EB |
2505 | #endif |
2506 | #ifdef CONFIG_SCHEDSTATS | |
61a28784 | 2507 | INF("schedstat", S_IRUGO, pid_schedstat), |
28a6d671 | 2508 | #endif |
9745512c AV |
2509 | #ifdef CONFIG_LATENCYTOP |
2510 | REG("latency", S_IRUGO, lstats), | |
2511 | #endif | |
8793d854 | 2512 | #ifdef CONFIG_PROC_PID_CPUSET |
61a28784 | 2513 | REG("cpuset", S_IRUGO, cpuset), |
a424316c PM |
2514 | #endif |
2515 | #ifdef CONFIG_CGROUPS | |
2516 | REG("cgroup", S_IRUGO, cgroup), | |
28a6d671 | 2517 | #endif |
61a28784 EB |
2518 | INF("oom_score", S_IRUGO, oom_score), |
2519 | REG("oom_adj", S_IRUGO|S_IWUSR, oom_adjust), | |
28a6d671 | 2520 | #ifdef CONFIG_AUDITSYSCALL |
61a28784 | 2521 | REG("loginuid", S_IWUSR|S_IRUGO, loginuid), |
6ee65046 | 2522 | REG("sessionid", S_IRUGO, sessionid), |
28a6d671 | 2523 | #endif |
f4f154fd AM |
2524 | #ifdef CONFIG_FAULT_INJECTION |
2525 | REG("make-it-fail", S_IRUGO|S_IWUSR, fault_inject), | |
2526 | #endif | |
3cb4a0bb KH |
2527 | #if defined(USE_ELF_CORE_DUMP) && defined(CONFIG_ELF_CORE) |
2528 | REG("coredump_filter", S_IRUGO|S_IWUSR, coredump_filter), | |
2529 | #endif | |
aba76fdb | 2530 | #ifdef CONFIG_TASK_IO_ACCOUNTING |
297c5d92 | 2531 | INF("io", S_IRUGO, tgid_io_accounting), |
aba76fdb | 2532 | #endif |
28a6d671 | 2533 | }; |
1da177e4 | 2534 | |
28a6d671 | 2535 | static int proc_tgid_base_readdir(struct file * filp, |
1da177e4 LT |
2536 | void * dirent, filldir_t filldir) |
2537 | { | |
2538 | return proc_pident_readdir(filp,dirent,filldir, | |
28a6d671 | 2539 | tgid_base_stuff,ARRAY_SIZE(tgid_base_stuff)); |
1da177e4 LT |
2540 | } |
2541 | ||
00977a59 | 2542 | static const struct file_operations proc_tgid_base_operations = { |
1da177e4 | 2543 | .read = generic_read_dir, |
28a6d671 | 2544 | .readdir = proc_tgid_base_readdir, |
1da177e4 LT |
2545 | }; |
2546 | ||
28a6d671 | 2547 | static struct dentry *proc_tgid_base_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd){ |
7bcd6b0e EB |
2548 | return proc_pident_lookup(dir, dentry, |
2549 | tgid_base_stuff, ARRAY_SIZE(tgid_base_stuff)); | |
1da177e4 LT |
2550 | } |
2551 | ||
c5ef1c42 | 2552 | static const struct inode_operations proc_tgid_base_inode_operations = { |
28a6d671 | 2553 | .lookup = proc_tgid_base_lookup, |
99f89551 | 2554 | .getattr = pid_getattr, |
6d76fa58 | 2555 | .setattr = proc_setattr, |
1da177e4 | 2556 | }; |
1da177e4 | 2557 | |
60347f67 | 2558 | static void proc_flush_task_mnt(struct vfsmount *mnt, pid_t pid, pid_t tgid) |
1da177e4 | 2559 | { |
48e6484d | 2560 | struct dentry *dentry, *leader, *dir; |
8578cea7 | 2561 | char buf[PROC_NUMBUF]; |
48e6484d EB |
2562 | struct qstr name; |
2563 | ||
2564 | name.name = buf; | |
60347f67 PE |
2565 | name.len = snprintf(buf, sizeof(buf), "%d", pid); |
2566 | dentry = d_hash_and_lookup(mnt->mnt_root, &name); | |
48e6484d | 2567 | if (dentry) { |
7766755a AA |
2568 | if (!(current->flags & PF_EXITING)) |
2569 | shrink_dcache_parent(dentry); | |
48e6484d EB |
2570 | d_drop(dentry); |
2571 | dput(dentry); | |
2572 | } | |
1da177e4 | 2573 | |
60347f67 | 2574 | if (tgid == 0) |
48e6484d | 2575 | goto out; |
1da177e4 | 2576 | |
48e6484d | 2577 | name.name = buf; |
60347f67 PE |
2578 | name.len = snprintf(buf, sizeof(buf), "%d", tgid); |
2579 | leader = d_hash_and_lookup(mnt->mnt_root, &name); | |
48e6484d EB |
2580 | if (!leader) |
2581 | goto out; | |
1da177e4 | 2582 | |
48e6484d EB |
2583 | name.name = "task"; |
2584 | name.len = strlen(name.name); | |
2585 | dir = d_hash_and_lookup(leader, &name); | |
2586 | if (!dir) | |
2587 | goto out_put_leader; | |
2588 | ||
2589 | name.name = buf; | |
60347f67 | 2590 | name.len = snprintf(buf, sizeof(buf), "%d", pid); |
48e6484d EB |
2591 | dentry = d_hash_and_lookup(dir, &name); |
2592 | if (dentry) { | |
2593 | shrink_dcache_parent(dentry); | |
2594 | d_drop(dentry); | |
2595 | dput(dentry); | |
1da177e4 | 2596 | } |
48e6484d EB |
2597 | |
2598 | dput(dir); | |
2599 | out_put_leader: | |
2600 | dput(leader); | |
2601 | out: | |
2602 | return; | |
1da177e4 LT |
2603 | } |
2604 | ||
0895e91d RD |
2605 | /** |
2606 | * proc_flush_task - Remove dcache entries for @task from the /proc dcache. | |
2607 | * @task: task that should be flushed. | |
2608 | * | |
2609 | * When flushing dentries from proc, one needs to flush them from global | |
60347f67 | 2610 | * proc (proc_mnt) and from all the namespaces' procs this task was seen |
0895e91d RD |
2611 | * in. This call is supposed to do all of this job. |
2612 | * | |
2613 | * Looks in the dcache for | |
2614 | * /proc/@pid | |
2615 | * /proc/@tgid/task/@pid | |
2616 | * if either directory is present flushes it and all of it'ts children | |
2617 | * from the dcache. | |
2618 | * | |
2619 | * It is safe and reasonable to cache /proc entries for a task until | |
2620 | * that task exits. After that they just clog up the dcache with | |
2621 | * useless entries, possibly causing useful dcache entries to be | |
2622 | * flushed instead. This routine is proved to flush those useless | |
2623 | * dcache entries at process exit time. | |
2624 | * | |
2625 | * NOTE: This routine is just an optimization so it does not guarantee | |
2626 | * that no dcache entries will exist at process exit time it | |
2627 | * just makes it very unlikely that any will persist. | |
60347f67 PE |
2628 | */ |
2629 | ||
2630 | void proc_flush_task(struct task_struct *task) | |
2631 | { | |
9fcc2d15 EB |
2632 | int i; |
2633 | struct pid *pid, *tgid = NULL; | |
130f77ec PE |
2634 | struct upid *upid; |
2635 | ||
130f77ec | 2636 | pid = task_pid(task); |
9fcc2d15 EB |
2637 | if (thread_group_leader(task)) |
2638 | tgid = task_tgid(task); | |
130f77ec | 2639 | |
9fcc2d15 | 2640 | for (i = 0; i <= pid->level; i++) { |
130f77ec PE |
2641 | upid = &pid->numbers[i]; |
2642 | proc_flush_task_mnt(upid->ns->proc_mnt, upid->nr, | |
9fcc2d15 | 2643 | tgid ? tgid->numbers[i].nr : 0); |
130f77ec | 2644 | } |
6f4e6433 PE |
2645 | |
2646 | upid = &pid->numbers[pid->level]; | |
2647 | if (upid->nr == 1) | |
2648 | pid_ns_release_proc(upid->ns); | |
60347f67 PE |
2649 | } |
2650 | ||
9711ef99 AB |
2651 | static struct dentry *proc_pid_instantiate(struct inode *dir, |
2652 | struct dentry * dentry, | |
c5141e6d | 2653 | struct task_struct *task, const void *ptr) |
444ceed8 EB |
2654 | { |
2655 | struct dentry *error = ERR_PTR(-ENOENT); | |
2656 | struct inode *inode; | |
2657 | ||
61a28784 | 2658 | inode = proc_pid_make_inode(dir->i_sb, task); |
444ceed8 EB |
2659 | if (!inode) |
2660 | goto out; | |
2661 | ||
2662 | inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO; | |
2663 | inode->i_op = &proc_tgid_base_inode_operations; | |
2664 | inode->i_fop = &proc_tgid_base_operations; | |
2665 | inode->i_flags|=S_IMMUTABLE; | |
aed54175 VN |
2666 | |
2667 | inode->i_nlink = 2 + pid_entry_count_dirs(tgid_base_stuff, | |
2668 | ARRAY_SIZE(tgid_base_stuff)); | |
444ceed8 EB |
2669 | |
2670 | dentry->d_op = &pid_dentry_operations; | |
2671 | ||
2672 | d_add(dentry, inode); | |
2673 | /* Close the race of the process dying before we return the dentry */ | |
2674 | if (pid_revalidate(dentry, NULL)) | |
2675 | error = NULL; | |
2676 | out: | |
2677 | return error; | |
2678 | } | |
2679 | ||
1da177e4 LT |
2680 | struct dentry *proc_pid_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd) |
2681 | { | |
cd6a3ce9 | 2682 | struct dentry *result = ERR_PTR(-ENOENT); |
1da177e4 | 2683 | struct task_struct *task; |
1da177e4 | 2684 | unsigned tgid; |
b488893a | 2685 | struct pid_namespace *ns; |
1da177e4 | 2686 | |
801199ce EB |
2687 | result = proc_base_lookup(dir, dentry); |
2688 | if (!IS_ERR(result) || PTR_ERR(result) != -ENOENT) | |
2689 | goto out; | |
2690 | ||
1da177e4 LT |
2691 | tgid = name_to_int(dentry); |
2692 | if (tgid == ~0U) | |
2693 | goto out; | |
2694 | ||
b488893a | 2695 | ns = dentry->d_sb->s_fs_info; |
de758734 | 2696 | rcu_read_lock(); |
b488893a | 2697 | task = find_task_by_pid_ns(tgid, ns); |
1da177e4 LT |
2698 | if (task) |
2699 | get_task_struct(task); | |
de758734 | 2700 | rcu_read_unlock(); |
1da177e4 LT |
2701 | if (!task) |
2702 | goto out; | |
2703 | ||
444ceed8 | 2704 | result = proc_pid_instantiate(dir, dentry, task, NULL); |
1da177e4 | 2705 | put_task_struct(task); |
1da177e4 | 2706 | out: |
cd6a3ce9 | 2707 | return result; |
1da177e4 LT |
2708 | } |
2709 | ||
1da177e4 | 2710 | /* |
0804ef4b | 2711 | * Find the first task with tgid >= tgid |
0bc58a91 | 2712 | * |
1da177e4 | 2713 | */ |
19fd4bb2 EB |
2714 | struct tgid_iter { |
2715 | unsigned int tgid; | |
0804ef4b | 2716 | struct task_struct *task; |
19fd4bb2 EB |
2717 | }; |
2718 | static struct tgid_iter next_tgid(struct pid_namespace *ns, struct tgid_iter iter) | |
2719 | { | |
0804ef4b | 2720 | struct pid *pid; |
1da177e4 | 2721 | |
19fd4bb2 EB |
2722 | if (iter.task) |
2723 | put_task_struct(iter.task); | |
454cc105 | 2724 | rcu_read_lock(); |
0804ef4b | 2725 | retry: |
19fd4bb2 EB |
2726 | iter.task = NULL; |
2727 | pid = find_ge_pid(iter.tgid, ns); | |
0804ef4b | 2728 | if (pid) { |
19fd4bb2 EB |
2729 | iter.tgid = pid_nr_ns(pid, ns); |
2730 | iter.task = pid_task(pid, PIDTYPE_PID); | |
0804ef4b EB |
2731 | /* What we to know is if the pid we have find is the |
2732 | * pid of a thread_group_leader. Testing for task | |
2733 | * being a thread_group_leader is the obvious thing | |
2734 | * todo but there is a window when it fails, due to | |
2735 | * the pid transfer logic in de_thread. | |
2736 | * | |
2737 | * So we perform the straight forward test of seeing | |
2738 | * if the pid we have found is the pid of a thread | |
2739 | * group leader, and don't worry if the task we have | |
2740 | * found doesn't happen to be a thread group leader. | |
2741 | * As we don't care in the case of readdir. | |
2742 | */ | |
19fd4bb2 EB |
2743 | if (!iter.task || !has_group_leader_pid(iter.task)) { |
2744 | iter.tgid += 1; | |
0804ef4b | 2745 | goto retry; |
19fd4bb2 EB |
2746 | } |
2747 | get_task_struct(iter.task); | |
0bc58a91 | 2748 | } |
454cc105 | 2749 | rcu_read_unlock(); |
19fd4bb2 | 2750 | return iter; |
1da177e4 LT |
2751 | } |
2752 | ||
7bcd6b0e | 2753 | #define TGID_OFFSET (FIRST_PROCESS_ENTRY + ARRAY_SIZE(proc_base_stuff)) |
0804ef4b | 2754 | |
61a28784 | 2755 | static int proc_pid_fill_cache(struct file *filp, void *dirent, filldir_t filldir, |
19fd4bb2 | 2756 | struct tgid_iter iter) |
61a28784 EB |
2757 | { |
2758 | char name[PROC_NUMBUF]; | |
19fd4bb2 | 2759 | int len = snprintf(name, sizeof(name), "%d", iter.tgid); |
61a28784 | 2760 | return proc_fill_cache(filp, dirent, filldir, name, len, |
19fd4bb2 | 2761 | proc_pid_instantiate, iter.task, NULL); |
61a28784 EB |
2762 | } |
2763 | ||
1da177e4 LT |
2764 | /* for the /proc/ directory itself, after non-process stuff has been done */ |
2765 | int proc_pid_readdir(struct file * filp, void * dirent, filldir_t filldir) | |
2766 | { | |
1da177e4 | 2767 | unsigned int nr = filp->f_pos - FIRST_PROCESS_ENTRY; |
2fddfeef | 2768 | struct task_struct *reaper = get_proc_task(filp->f_path.dentry->d_inode); |
19fd4bb2 | 2769 | struct tgid_iter iter; |
b488893a | 2770 | struct pid_namespace *ns; |
1da177e4 | 2771 | |
61a28784 EB |
2772 | if (!reaper) |
2773 | goto out_no_task; | |
2774 | ||
7bcd6b0e | 2775 | for (; nr < ARRAY_SIZE(proc_base_stuff); filp->f_pos++, nr++) { |
c5141e6d | 2776 | const struct pid_entry *p = &proc_base_stuff[nr]; |
61a28784 | 2777 | if (proc_base_fill_cache(filp, dirent, filldir, reaper, p) < 0) |
801199ce | 2778 | goto out; |
1da177e4 LT |
2779 | } |
2780 | ||
b488893a | 2781 | ns = filp->f_dentry->d_sb->s_fs_info; |
19fd4bb2 EB |
2782 | iter.task = NULL; |
2783 | iter.tgid = filp->f_pos - TGID_OFFSET; | |
2784 | for (iter = next_tgid(ns, iter); | |
2785 | iter.task; | |
2786 | iter.tgid += 1, iter = next_tgid(ns, iter)) { | |
2787 | filp->f_pos = iter.tgid + TGID_OFFSET; | |
2788 | if (proc_pid_fill_cache(filp, dirent, filldir, iter) < 0) { | |
2789 | put_task_struct(iter.task); | |
0804ef4b | 2790 | goto out; |
1da177e4 | 2791 | } |
0bc58a91 | 2792 | } |
0804ef4b EB |
2793 | filp->f_pos = PID_MAX_LIMIT + TGID_OFFSET; |
2794 | out: | |
61a28784 EB |
2795 | put_task_struct(reaper); |
2796 | out_no_task: | |
0bc58a91 EB |
2797 | return 0; |
2798 | } | |
1da177e4 | 2799 | |
28a6d671 EB |
2800 | /* |
2801 | * Tasks | |
2802 | */ | |
c5141e6d | 2803 | static const struct pid_entry tid_base_stuff[] = { |
61a28784 | 2804 | DIR("fd", S_IRUSR|S_IXUSR, fd), |
27932742 | 2805 | DIR("fdinfo", S_IRUSR|S_IXUSR, fdinfo), |
315e28c8 | 2806 | REG("environ", S_IRUSR, environ), |
61a28784 | 2807 | INF("auxv", S_IRUSR, pid_auxv), |
df5f8314 | 2808 | ONE("status", S_IRUGO, pid_status), |
47830723 | 2809 | ONE("personality", S_IRUSR, pid_personality), |
d85f50d5 | 2810 | INF("limits", S_IRUSR, pid_limits), |
43ae34cb IM |
2811 | #ifdef CONFIG_SCHED_DEBUG |
2812 | REG("sched", S_IRUGO|S_IWUSR, pid_sched), | |
ebcb6734 RM |
2813 | #endif |
2814 | #ifdef CONFIG_HAVE_ARCH_TRACEHOOK | |
2815 | INF("syscall", S_IRUSR, pid_syscall), | |
43ae34cb | 2816 | #endif |
61a28784 | 2817 | INF("cmdline", S_IRUGO, pid_cmdline), |
ee992744 | 2818 | ONE("stat", S_IRUGO, tid_stat), |
a56d3fc7 | 2819 | ONE("statm", S_IRUGO, pid_statm), |
61a28784 | 2820 | REG("maps", S_IRUGO, maps), |
28a6d671 | 2821 | #ifdef CONFIG_NUMA |
61a28784 | 2822 | REG("numa_maps", S_IRUGO, numa_maps), |
28a6d671 | 2823 | #endif |
61a28784 | 2824 | REG("mem", S_IRUSR|S_IWUSR, mem), |
61a28784 EB |
2825 | LNK("cwd", cwd), |
2826 | LNK("root", root), | |
2827 | LNK("exe", exe), | |
2828 | REG("mounts", S_IRUGO, mounts), | |
2d4d4864 | 2829 | REG("mountinfo", S_IRUGO, mountinfo), |
1e883281 | 2830 | #ifdef CONFIG_PROC_PAGE_MONITOR |
b813e931 | 2831 | REG("clear_refs", S_IWUSR, clear_refs), |
61a28784 | 2832 | REG("smaps", S_IRUGO, smaps), |
85863e47 | 2833 | REG("pagemap", S_IRUSR, pagemap), |
28a6d671 EB |
2834 | #endif |
2835 | #ifdef CONFIG_SECURITY | |
72d9dcfc | 2836 | DIR("attr", S_IRUGO|S_IXUGO, attr_dir), |
28a6d671 EB |
2837 | #endif |
2838 | #ifdef CONFIG_KALLSYMS | |
61a28784 | 2839 | INF("wchan", S_IRUGO, pid_wchan), |
28a6d671 EB |
2840 | #endif |
2841 | #ifdef CONFIG_SCHEDSTATS | |
61a28784 | 2842 | INF("schedstat", S_IRUGO, pid_schedstat), |
28a6d671 | 2843 | #endif |
9745512c AV |
2844 | #ifdef CONFIG_LATENCYTOP |
2845 | REG("latency", S_IRUGO, lstats), | |
2846 | #endif | |
8793d854 | 2847 | #ifdef CONFIG_PROC_PID_CPUSET |
61a28784 | 2848 | REG("cpuset", S_IRUGO, cpuset), |
a424316c PM |
2849 | #endif |
2850 | #ifdef CONFIG_CGROUPS | |
2851 | REG("cgroup", S_IRUGO, cgroup), | |
28a6d671 | 2852 | #endif |
61a28784 EB |
2853 | INF("oom_score", S_IRUGO, oom_score), |
2854 | REG("oom_adj", S_IRUGO|S_IWUSR, oom_adjust), | |
28a6d671 | 2855 | #ifdef CONFIG_AUDITSYSCALL |
61a28784 | 2856 | REG("loginuid", S_IWUSR|S_IRUGO, loginuid), |
1e0bd755 | 2857 | REG("sessionid", S_IRUSR, sessionid), |
28a6d671 | 2858 | #endif |
f4f154fd AM |
2859 | #ifdef CONFIG_FAULT_INJECTION |
2860 | REG("make-it-fail", S_IRUGO|S_IWUSR, fault_inject), | |
2861 | #endif | |
297c5d92 AR |
2862 | #ifdef CONFIG_TASK_IO_ACCOUNTING |
2863 | INF("io", S_IRUGO, tid_io_accounting), | |
2864 | #endif | |
28a6d671 EB |
2865 | }; |
2866 | ||
2867 | static int proc_tid_base_readdir(struct file * filp, | |
2868 | void * dirent, filldir_t filldir) | |
2869 | { | |
2870 | return proc_pident_readdir(filp,dirent,filldir, | |
2871 | tid_base_stuff,ARRAY_SIZE(tid_base_stuff)); | |
2872 | } | |
2873 | ||
2874 | static struct dentry *proc_tid_base_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd){ | |
7bcd6b0e EB |
2875 | return proc_pident_lookup(dir, dentry, |
2876 | tid_base_stuff, ARRAY_SIZE(tid_base_stuff)); | |
28a6d671 EB |
2877 | } |
2878 | ||
00977a59 | 2879 | static const struct file_operations proc_tid_base_operations = { |
28a6d671 EB |
2880 | .read = generic_read_dir, |
2881 | .readdir = proc_tid_base_readdir, | |
2882 | }; | |
2883 | ||
c5ef1c42 | 2884 | static const struct inode_operations proc_tid_base_inode_operations = { |
28a6d671 EB |
2885 | .lookup = proc_tid_base_lookup, |
2886 | .getattr = pid_getattr, | |
2887 | .setattr = proc_setattr, | |
2888 | }; | |
2889 | ||
444ceed8 | 2890 | static struct dentry *proc_task_instantiate(struct inode *dir, |
c5141e6d | 2891 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
444ceed8 EB |
2892 | { |
2893 | struct dentry *error = ERR_PTR(-ENOENT); | |
2894 | struct inode *inode; | |
61a28784 | 2895 | inode = proc_pid_make_inode(dir->i_sb, task); |
444ceed8 EB |
2896 | |
2897 | if (!inode) | |
2898 | goto out; | |
2899 | inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO; | |
2900 | inode->i_op = &proc_tid_base_inode_operations; | |
2901 | inode->i_fop = &proc_tid_base_operations; | |
2902 | inode->i_flags|=S_IMMUTABLE; | |
aed54175 VN |
2903 | |
2904 | inode->i_nlink = 2 + pid_entry_count_dirs(tid_base_stuff, | |
2905 | ARRAY_SIZE(tid_base_stuff)); | |
444ceed8 EB |
2906 | |
2907 | dentry->d_op = &pid_dentry_operations; | |
2908 | ||
2909 | d_add(dentry, inode); | |
2910 | /* Close the race of the process dying before we return the dentry */ | |
2911 | if (pid_revalidate(dentry, NULL)) | |
2912 | error = NULL; | |
2913 | out: | |
2914 | return error; | |
2915 | } | |
2916 | ||
28a6d671 EB |
2917 | static struct dentry *proc_task_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd) |
2918 | { | |
2919 | struct dentry *result = ERR_PTR(-ENOENT); | |
2920 | struct task_struct *task; | |
2921 | struct task_struct *leader = get_proc_task(dir); | |
28a6d671 | 2922 | unsigned tid; |
b488893a | 2923 | struct pid_namespace *ns; |
28a6d671 EB |
2924 | |
2925 | if (!leader) | |
2926 | goto out_no_task; | |
2927 | ||
2928 | tid = name_to_int(dentry); | |
2929 | if (tid == ~0U) | |
2930 | goto out; | |
2931 | ||
b488893a | 2932 | ns = dentry->d_sb->s_fs_info; |
28a6d671 | 2933 | rcu_read_lock(); |
b488893a | 2934 | task = find_task_by_pid_ns(tid, ns); |
28a6d671 EB |
2935 | if (task) |
2936 | get_task_struct(task); | |
2937 | rcu_read_unlock(); | |
2938 | if (!task) | |
2939 | goto out; | |
bac0abd6 | 2940 | if (!same_thread_group(leader, task)) |
28a6d671 EB |
2941 | goto out_drop_task; |
2942 | ||
444ceed8 | 2943 | result = proc_task_instantiate(dir, dentry, task, NULL); |
28a6d671 EB |
2944 | out_drop_task: |
2945 | put_task_struct(task); | |
2946 | out: | |
2947 | put_task_struct(leader); | |
2948 | out_no_task: | |
2949 | return result; | |
2950 | } | |
2951 | ||
0bc58a91 EB |
2952 | /* |
2953 | * Find the first tid of a thread group to return to user space. | |
2954 | * | |
2955 | * Usually this is just the thread group leader, but if the users | |
2956 | * buffer was too small or there was a seek into the middle of the | |
2957 | * directory we have more work todo. | |
2958 | * | |
2959 | * In the case of a short read we start with find_task_by_pid. | |
2960 | * | |
2961 | * In the case of a seek we start with the leader and walk nr | |
2962 | * threads past it. | |
2963 | */ | |
cc288738 | 2964 | static struct task_struct *first_tid(struct task_struct *leader, |
b488893a | 2965 | int tid, int nr, struct pid_namespace *ns) |
0bc58a91 | 2966 | { |
a872ff0c | 2967 | struct task_struct *pos; |
1da177e4 | 2968 | |
cc288738 | 2969 | rcu_read_lock(); |
0bc58a91 EB |
2970 | /* Attempt to start with the pid of a thread */ |
2971 | if (tid && (nr > 0)) { | |
b488893a | 2972 | pos = find_task_by_pid_ns(tid, ns); |
a872ff0c ON |
2973 | if (pos && (pos->group_leader == leader)) |
2974 | goto found; | |
0bc58a91 | 2975 | } |
1da177e4 | 2976 | |
0bc58a91 | 2977 | /* If nr exceeds the number of threads there is nothing todo */ |
a872ff0c ON |
2978 | pos = NULL; |
2979 | if (nr && nr >= get_nr_threads(leader)) | |
2980 | goto out; | |
1da177e4 | 2981 | |
a872ff0c ON |
2982 | /* If we haven't found our starting place yet start |
2983 | * with the leader and walk nr threads forward. | |
0bc58a91 | 2984 | */ |
a872ff0c ON |
2985 | for (pos = leader; nr > 0; --nr) { |
2986 | pos = next_thread(pos); | |
2987 | if (pos == leader) { | |
2988 | pos = NULL; | |
2989 | goto out; | |
2990 | } | |
1da177e4 | 2991 | } |
a872ff0c ON |
2992 | found: |
2993 | get_task_struct(pos); | |
2994 | out: | |
cc288738 | 2995 | rcu_read_unlock(); |
0bc58a91 EB |
2996 | return pos; |
2997 | } | |
2998 | ||
2999 | /* | |
3000 | * Find the next thread in the thread list. | |
3001 | * Return NULL if there is an error or no next thread. | |
3002 | * | |
3003 | * The reference to the input task_struct is released. | |
3004 | */ | |
3005 | static struct task_struct *next_tid(struct task_struct *start) | |
3006 | { | |
c1df7fb8 | 3007 | struct task_struct *pos = NULL; |
cc288738 | 3008 | rcu_read_lock(); |
c1df7fb8 | 3009 | if (pid_alive(start)) { |
0bc58a91 | 3010 | pos = next_thread(start); |
c1df7fb8 ON |
3011 | if (thread_group_leader(pos)) |
3012 | pos = NULL; | |
3013 | else | |
3014 | get_task_struct(pos); | |
3015 | } | |
cc288738 | 3016 | rcu_read_unlock(); |
0bc58a91 EB |
3017 | put_task_struct(start); |
3018 | return pos; | |
1da177e4 LT |
3019 | } |
3020 | ||
61a28784 EB |
3021 | static int proc_task_fill_cache(struct file *filp, void *dirent, filldir_t filldir, |
3022 | struct task_struct *task, int tid) | |
3023 | { | |
3024 | char name[PROC_NUMBUF]; | |
3025 | int len = snprintf(name, sizeof(name), "%d", tid); | |
3026 | return proc_fill_cache(filp, dirent, filldir, name, len, | |
3027 | proc_task_instantiate, task, NULL); | |
3028 | } | |
3029 | ||
1da177e4 LT |
3030 | /* for the /proc/TGID/task/ directories */ |
3031 | static int proc_task_readdir(struct file * filp, void * dirent, filldir_t filldir) | |
3032 | { | |
2fddfeef | 3033 | struct dentry *dentry = filp->f_path.dentry; |
1da177e4 | 3034 | struct inode *inode = dentry->d_inode; |
7d895244 | 3035 | struct task_struct *leader = NULL; |
0bc58a91 | 3036 | struct task_struct *task; |
1da177e4 LT |
3037 | int retval = -ENOENT; |
3038 | ino_t ino; | |
0bc58a91 | 3039 | int tid; |
1da177e4 | 3040 | unsigned long pos = filp->f_pos; /* avoiding "long long" filp->f_pos */ |
b488893a | 3041 | struct pid_namespace *ns; |
1da177e4 | 3042 | |
7d895244 GC |
3043 | task = get_proc_task(inode); |
3044 | if (!task) | |
3045 | goto out_no_task; | |
3046 | rcu_read_lock(); | |
3047 | if (pid_alive(task)) { | |
3048 | leader = task->group_leader; | |
3049 | get_task_struct(leader); | |
3050 | } | |
3051 | rcu_read_unlock(); | |
3052 | put_task_struct(task); | |
99f89551 EB |
3053 | if (!leader) |
3054 | goto out_no_task; | |
1da177e4 LT |
3055 | retval = 0; |
3056 | ||
3057 | switch (pos) { | |
3058 | case 0: | |
3059 | ino = inode->i_ino; | |
3060 | if (filldir(dirent, ".", 1, pos, ino, DT_DIR) < 0) | |
3061 | goto out; | |
3062 | pos++; | |
3063 | /* fall through */ | |
3064 | case 1: | |
3065 | ino = parent_ino(dentry); | |
3066 | if (filldir(dirent, "..", 2, pos, ino, DT_DIR) < 0) | |
3067 | goto out; | |
3068 | pos++; | |
3069 | /* fall through */ | |
3070 | } | |
3071 | ||
0bc58a91 EB |
3072 | /* f_version caches the tgid value that the last readdir call couldn't |
3073 | * return. lseek aka telldir automagically resets f_version to 0. | |
3074 | */ | |
b488893a | 3075 | ns = filp->f_dentry->d_sb->s_fs_info; |
2b47c361 | 3076 | tid = (int)filp->f_version; |
0bc58a91 | 3077 | filp->f_version = 0; |
b488893a | 3078 | for (task = first_tid(leader, tid, pos - 2, ns); |
0bc58a91 EB |
3079 | task; |
3080 | task = next_tid(task), pos++) { | |
b488893a | 3081 | tid = task_pid_nr_ns(task, ns); |
61a28784 | 3082 | if (proc_task_fill_cache(filp, dirent, filldir, task, tid) < 0) { |
0bc58a91 EB |
3083 | /* returning this tgid failed, save it as the first |
3084 | * pid for the next readir call */ | |
2b47c361 | 3085 | filp->f_version = (u64)tid; |
0bc58a91 | 3086 | put_task_struct(task); |
1da177e4 | 3087 | break; |
0bc58a91 | 3088 | } |
1da177e4 LT |
3089 | } |
3090 | out: | |
3091 | filp->f_pos = pos; | |
99f89551 EB |
3092 | put_task_struct(leader); |
3093 | out_no_task: | |
1da177e4 LT |
3094 | return retval; |
3095 | } | |
6e66b52b EB |
3096 | |
3097 | static int proc_task_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) | |
3098 | { | |
3099 | struct inode *inode = dentry->d_inode; | |
99f89551 | 3100 | struct task_struct *p = get_proc_task(inode); |
6e66b52b EB |
3101 | generic_fillattr(inode, stat); |
3102 | ||
99f89551 | 3103 | if (p) { |
99f89551 | 3104 | stat->nlink += get_nr_threads(p); |
99f89551 | 3105 | put_task_struct(p); |
6e66b52b EB |
3106 | } |
3107 | ||
3108 | return 0; | |
3109 | } | |
28a6d671 | 3110 | |
c5ef1c42 | 3111 | static const struct inode_operations proc_task_inode_operations = { |
28a6d671 EB |
3112 | .lookup = proc_task_lookup, |
3113 | .getattr = proc_task_getattr, | |
3114 | .setattr = proc_setattr, | |
3115 | }; | |
3116 | ||
00977a59 | 3117 | static const struct file_operations proc_task_operations = { |
28a6d671 EB |
3118 | .read = generic_read_dir, |
3119 | .readdir = proc_task_readdir, | |
3120 | }; |