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> |
2ec220e2 | 68 | #include <linux/stacktrace.h> |
d85f50d5 | 69 | #include <linux/resource.h> |
5096add8 | 70 | #include <linux/module.h> |
1da177e4 LT |
71 | #include <linux/mount.h> |
72 | #include <linux/security.h> | |
73 | #include <linux/ptrace.h> | |
0d094efe | 74 | #include <linux/tracehook.h> |
a424316c | 75 | #include <linux/cgroup.h> |
1da177e4 LT |
76 | #include <linux/cpuset.h> |
77 | #include <linux/audit.h> | |
5addc5dd | 78 | #include <linux/poll.h> |
1651e14e | 79 | #include <linux/nsproxy.h> |
8ac773b4 | 80 | #include <linux/oom.h> |
3cb4a0bb | 81 | #include <linux/elf.h> |
60347f67 | 82 | #include <linux/pid_namespace.h> |
1da177e4 LT |
83 | #include "internal.h" |
84 | ||
0f2fe20f EB |
85 | /* NOTE: |
86 | * Implementing inode permission operations in /proc is almost | |
87 | * certainly an error. Permission checks need to happen during | |
88 | * each system call not at open time. The reason is that most of | |
89 | * what we wish to check for permissions in /proc varies at runtime. | |
90 | * | |
91 | * The classic example of a problem is opening file descriptors | |
92 | * in /proc for a task before it execs a suid executable. | |
93 | */ | |
94 | ||
1da177e4 | 95 | struct pid_entry { |
1da177e4 | 96 | char *name; |
c5141e6d | 97 | int len; |
1da177e4 | 98 | mode_t mode; |
c5ef1c42 | 99 | const struct inode_operations *iop; |
00977a59 | 100 | const struct file_operations *fop; |
20cdc894 | 101 | union proc_op op; |
1da177e4 LT |
102 | }; |
103 | ||
61a28784 | 104 | #define NOD(NAME, MODE, IOP, FOP, OP) { \ |
20cdc894 | 105 | .name = (NAME), \ |
c5141e6d | 106 | .len = sizeof(NAME) - 1, \ |
20cdc894 EB |
107 | .mode = MODE, \ |
108 | .iop = IOP, \ | |
109 | .fop = FOP, \ | |
110 | .op = OP, \ | |
111 | } | |
112 | ||
631f9c18 AD |
113 | #define DIR(NAME, MODE, iops, fops) \ |
114 | NOD(NAME, (S_IFDIR|(MODE)), &iops, &fops, {} ) | |
115 | #define LNK(NAME, get_link) \ | |
61a28784 | 116 | NOD(NAME, (S_IFLNK|S_IRWXUGO), \ |
20cdc894 | 117 | &proc_pid_link_inode_operations, NULL, \ |
631f9c18 AD |
118 | { .proc_get_link = get_link } ) |
119 | #define REG(NAME, MODE, fops) \ | |
120 | NOD(NAME, (S_IFREG|(MODE)), NULL, &fops, {}) | |
121 | #define INF(NAME, MODE, read) \ | |
61a28784 | 122 | NOD(NAME, (S_IFREG|(MODE)), \ |
20cdc894 | 123 | NULL, &proc_info_file_operations, \ |
631f9c18 AD |
124 | { .proc_read = read } ) |
125 | #define ONE(NAME, MODE, show) \ | |
be614086 EB |
126 | NOD(NAME, (S_IFREG|(MODE)), \ |
127 | NULL, &proc_single_file_operations, \ | |
631f9c18 | 128 | { .proc_show = show } ) |
1da177e4 | 129 | |
aed54175 VN |
130 | /* |
131 | * Count the number of hardlinks for the pid_entry table, excluding the . | |
132 | * and .. links. | |
133 | */ | |
134 | static unsigned int pid_entry_count_dirs(const struct pid_entry *entries, | |
135 | unsigned int n) | |
136 | { | |
137 | unsigned int i; | |
138 | unsigned int count; | |
139 | ||
140 | count = 0; | |
141 | for (i = 0; i < n; ++i) { | |
142 | if (S_ISDIR(entries[i].mode)) | |
143 | ++count; | |
144 | } | |
145 | ||
146 | return count; | |
147 | } | |
148 | ||
0494f6ec | 149 | static struct fs_struct *get_fs_struct(struct task_struct *task) |
1da177e4 LT |
150 | { |
151 | struct fs_struct *fs; | |
0494f6ec MS |
152 | task_lock(task); |
153 | fs = task->fs; | |
1da177e4 LT |
154 | if(fs) |
155 | atomic_inc(&fs->count); | |
0494f6ec MS |
156 | task_unlock(task); |
157 | return fs; | |
158 | } | |
159 | ||
99f89551 EB |
160 | static int get_nr_threads(struct task_struct *tsk) |
161 | { | |
99f89551 EB |
162 | unsigned long flags; |
163 | int count = 0; | |
164 | ||
165 | if (lock_task_sighand(tsk, &flags)) { | |
166 | count = atomic_read(&tsk->signal->count); | |
167 | unlock_task_sighand(tsk, &flags); | |
168 | } | |
169 | return count; | |
170 | } | |
171 | ||
3dcd25f3 | 172 | static int proc_cwd_link(struct inode *inode, struct path *path) |
0494f6ec | 173 | { |
99f89551 EB |
174 | struct task_struct *task = get_proc_task(inode); |
175 | struct fs_struct *fs = NULL; | |
0494f6ec | 176 | int result = -ENOENT; |
99f89551 EB |
177 | |
178 | if (task) { | |
179 | fs = get_fs_struct(task); | |
180 | put_task_struct(task); | |
181 | } | |
1da177e4 LT |
182 | if (fs) { |
183 | read_lock(&fs->lock); | |
3dcd25f3 JB |
184 | *path = fs->pwd; |
185 | path_get(&fs->pwd); | |
1da177e4 LT |
186 | read_unlock(&fs->lock); |
187 | result = 0; | |
188 | put_fs_struct(fs); | |
189 | } | |
190 | return result; | |
191 | } | |
192 | ||
3dcd25f3 | 193 | static int proc_root_link(struct inode *inode, struct path *path) |
1da177e4 | 194 | { |
99f89551 EB |
195 | struct task_struct *task = get_proc_task(inode); |
196 | struct fs_struct *fs = NULL; | |
1da177e4 | 197 | int result = -ENOENT; |
99f89551 EB |
198 | |
199 | if (task) { | |
200 | fs = get_fs_struct(task); | |
201 | put_task_struct(task); | |
202 | } | |
1da177e4 LT |
203 | if (fs) { |
204 | read_lock(&fs->lock); | |
3dcd25f3 JB |
205 | *path = fs->root; |
206 | path_get(&fs->root); | |
1da177e4 LT |
207 | read_unlock(&fs->lock); |
208 | result = 0; | |
209 | put_fs_struct(fs); | |
210 | } | |
211 | return result; | |
212 | } | |
213 | ||
638fa202 RM |
214 | /* |
215 | * Return zero if current may access user memory in @task, -error if not. | |
216 | */ | |
217 | static int check_mem_permission(struct task_struct *task) | |
218 | { | |
219 | /* | |
220 | * A task can always look at itself, in case it chooses | |
221 | * to use system calls instead of load instructions. | |
222 | */ | |
223 | if (task == current) | |
224 | return 0; | |
225 | ||
226 | /* | |
227 | * If current is actively ptrace'ing, and would also be | |
228 | * permitted to freshly attach with ptrace now, permit it. | |
229 | */ | |
0d094efe RM |
230 | if (task_is_stopped_or_traced(task)) { |
231 | int match; | |
232 | rcu_read_lock(); | |
233 | match = (tracehook_tracer_task(task) == current); | |
234 | rcu_read_unlock(); | |
235 | if (match && ptrace_may_access(task, PTRACE_MODE_ATTACH)) | |
236 | return 0; | |
237 | } | |
638fa202 RM |
238 | |
239 | /* | |
240 | * Noone else is allowed. | |
241 | */ | |
242 | return -EPERM; | |
243 | } | |
1da177e4 | 244 | |
831830b5 AV |
245 | struct mm_struct *mm_for_maps(struct task_struct *task) |
246 | { | |
247 | struct mm_struct *mm = get_task_mm(task); | |
248 | if (!mm) | |
249 | return NULL; | |
250 | down_read(&mm->mmap_sem); | |
251 | task_lock(task); | |
252 | if (task->mm != mm) | |
253 | goto out; | |
006ebb40 SS |
254 | if (task->mm != current->mm && |
255 | __ptrace_may_access(task, PTRACE_MODE_READ) < 0) | |
831830b5 AV |
256 | goto out; |
257 | task_unlock(task); | |
258 | return mm; | |
259 | out: | |
260 | task_unlock(task); | |
261 | up_read(&mm->mmap_sem); | |
262 | mmput(mm); | |
263 | return NULL; | |
264 | } | |
265 | ||
1da177e4 LT |
266 | static int proc_pid_cmdline(struct task_struct *task, char * buffer) |
267 | { | |
268 | int res = 0; | |
269 | unsigned int len; | |
270 | struct mm_struct *mm = get_task_mm(task); | |
271 | if (!mm) | |
272 | goto out; | |
273 | if (!mm->arg_end) | |
274 | goto out_mm; /* Shh! No looking before we're done */ | |
275 | ||
276 | len = mm->arg_end - mm->arg_start; | |
277 | ||
278 | if (len > PAGE_SIZE) | |
279 | len = PAGE_SIZE; | |
280 | ||
281 | res = access_process_vm(task, mm->arg_start, buffer, len, 0); | |
282 | ||
283 | // If the nul at the end of args has been overwritten, then | |
284 | // assume application is using setproctitle(3). | |
285 | if (res > 0 && buffer[res-1] != '\0' && len < PAGE_SIZE) { | |
286 | len = strnlen(buffer, res); | |
287 | if (len < res) { | |
288 | res = len; | |
289 | } else { | |
290 | len = mm->env_end - mm->env_start; | |
291 | if (len > PAGE_SIZE - res) | |
292 | len = PAGE_SIZE - res; | |
293 | res += access_process_vm(task, mm->env_start, buffer+res, len, 0); | |
294 | res = strnlen(buffer, res); | |
295 | } | |
296 | } | |
297 | out_mm: | |
298 | mmput(mm); | |
299 | out: | |
300 | return res; | |
301 | } | |
302 | ||
303 | static int proc_pid_auxv(struct task_struct *task, char *buffer) | |
304 | { | |
305 | int res = 0; | |
306 | struct mm_struct *mm = get_task_mm(task); | |
307 | if (mm) { | |
308 | unsigned int nwords = 0; | |
dfe6b7d9 | 309 | do { |
1da177e4 | 310 | nwords += 2; |
dfe6b7d9 | 311 | } while (mm->saved_auxv[nwords - 2] != 0); /* AT_NULL */ |
1da177e4 LT |
312 | res = nwords * sizeof(mm->saved_auxv[0]); |
313 | if (res > PAGE_SIZE) | |
314 | res = PAGE_SIZE; | |
315 | memcpy(buffer, mm->saved_auxv, res); | |
316 | mmput(mm); | |
317 | } | |
318 | return res; | |
319 | } | |
320 | ||
321 | ||
322 | #ifdef CONFIG_KALLSYMS | |
323 | /* | |
324 | * Provides a wchan file via kallsyms in a proper one-value-per-file format. | |
325 | * Returns the resolved symbol. If that fails, simply return the address. | |
326 | */ | |
327 | static int proc_pid_wchan(struct task_struct *task, char *buffer) | |
328 | { | |
ffb45122 | 329 | unsigned long wchan; |
9281acea | 330 | char symname[KSYM_NAME_LEN]; |
1da177e4 LT |
331 | |
332 | wchan = get_wchan(task); | |
333 | ||
9d65cb4a AD |
334 | if (lookup_symbol_name(wchan, symname) < 0) |
335 | return sprintf(buffer, "%lu", wchan); | |
336 | else | |
337 | return sprintf(buffer, "%s", symname); | |
1da177e4 LT |
338 | } |
339 | #endif /* CONFIG_KALLSYMS */ | |
340 | ||
2ec220e2 KC |
341 | #ifdef CONFIG_STACKTRACE |
342 | ||
343 | #define MAX_STACK_TRACE_DEPTH 64 | |
344 | ||
345 | static int proc_pid_stack(struct seq_file *m, struct pid_namespace *ns, | |
346 | struct pid *pid, struct task_struct *task) | |
347 | { | |
348 | struct stack_trace trace; | |
349 | unsigned long *entries; | |
350 | int i; | |
351 | ||
352 | entries = kmalloc(MAX_STACK_TRACE_DEPTH * sizeof(*entries), GFP_KERNEL); | |
353 | if (!entries) | |
354 | return -ENOMEM; | |
355 | ||
356 | trace.nr_entries = 0; | |
357 | trace.max_entries = MAX_STACK_TRACE_DEPTH; | |
358 | trace.entries = entries; | |
359 | trace.skip = 0; | |
360 | save_stack_trace_tsk(task, &trace); | |
361 | ||
362 | for (i = 0; i < trace.nr_entries; i++) { | |
363 | seq_printf(m, "[<%p>] %pS\n", | |
364 | (void *)entries[i], (void *)entries[i]); | |
365 | } | |
366 | kfree(entries); | |
367 | ||
368 | return 0; | |
369 | } | |
370 | #endif | |
371 | ||
1da177e4 LT |
372 | #ifdef CONFIG_SCHEDSTATS |
373 | /* | |
374 | * Provides /proc/PID/schedstat | |
375 | */ | |
376 | static int proc_pid_schedstat(struct task_struct *task, char *buffer) | |
377 | { | |
172ba844 | 378 | return sprintf(buffer, "%llu %llu %lu\n", |
826e08b0 IM |
379 | (unsigned long long)task->se.sum_exec_runtime, |
380 | (unsigned long long)task->sched_info.run_delay, | |
2d72376b | 381 | task->sched_info.pcount); |
1da177e4 LT |
382 | } |
383 | #endif | |
384 | ||
9745512c AV |
385 | #ifdef CONFIG_LATENCYTOP |
386 | static int lstats_show_proc(struct seq_file *m, void *v) | |
387 | { | |
388 | int i; | |
13d77c37 HS |
389 | struct inode *inode = m->private; |
390 | struct task_struct *task = get_proc_task(inode); | |
9745512c | 391 | |
13d77c37 HS |
392 | if (!task) |
393 | return -ESRCH; | |
394 | seq_puts(m, "Latency Top version : v0.1\n"); | |
9745512c AV |
395 | for (i = 0; i < 32; i++) { |
396 | if (task->latency_record[i].backtrace[0]) { | |
397 | int q; | |
398 | seq_printf(m, "%i %li %li ", | |
399 | task->latency_record[i].count, | |
400 | task->latency_record[i].time, | |
401 | task->latency_record[i].max); | |
402 | for (q = 0; q < LT_BACKTRACEDEPTH; q++) { | |
9c246247 | 403 | char sym[KSYM_SYMBOL_LEN]; |
9745512c AV |
404 | char *c; |
405 | if (!task->latency_record[i].backtrace[q]) | |
406 | break; | |
407 | if (task->latency_record[i].backtrace[q] == ULONG_MAX) | |
408 | break; | |
409 | sprint_symbol(sym, task->latency_record[i].backtrace[q]); | |
410 | c = strchr(sym, '+'); | |
411 | if (c) | |
412 | *c = 0; | |
413 | seq_printf(m, "%s ", sym); | |
414 | } | |
415 | seq_printf(m, "\n"); | |
416 | } | |
417 | ||
418 | } | |
13d77c37 | 419 | put_task_struct(task); |
9745512c AV |
420 | return 0; |
421 | } | |
422 | ||
423 | static int lstats_open(struct inode *inode, struct file *file) | |
424 | { | |
13d77c37 | 425 | return single_open(file, lstats_show_proc, inode); |
d6643d12 HS |
426 | } |
427 | ||
9745512c AV |
428 | static ssize_t lstats_write(struct file *file, const char __user *buf, |
429 | size_t count, loff_t *offs) | |
430 | { | |
13d77c37 | 431 | struct task_struct *task = get_proc_task(file->f_dentry->d_inode); |
9745512c | 432 | |
13d77c37 HS |
433 | if (!task) |
434 | return -ESRCH; | |
9745512c | 435 | clear_all_latency_tracing(task); |
13d77c37 | 436 | put_task_struct(task); |
9745512c AV |
437 | |
438 | return count; | |
439 | } | |
440 | ||
441 | static const struct file_operations proc_lstats_operations = { | |
442 | .open = lstats_open, | |
443 | .read = seq_read, | |
444 | .write = lstats_write, | |
445 | .llseek = seq_lseek, | |
13d77c37 | 446 | .release = single_release, |
9745512c AV |
447 | }; |
448 | ||
449 | #endif | |
450 | ||
1da177e4 LT |
451 | /* The badness from the OOM killer */ |
452 | unsigned long badness(struct task_struct *p, unsigned long uptime); | |
453 | static int proc_oom_score(struct task_struct *task, char *buffer) | |
454 | { | |
455 | unsigned long points; | |
456 | struct timespec uptime; | |
457 | ||
458 | do_posix_clock_monotonic_gettime(&uptime); | |
19c5d45a | 459 | read_lock(&tasklist_lock); |
1da177e4 | 460 | points = badness(task, uptime.tv_sec); |
19c5d45a | 461 | read_unlock(&tasklist_lock); |
1da177e4 LT |
462 | return sprintf(buffer, "%lu\n", points); |
463 | } | |
464 | ||
d85f50d5 NH |
465 | struct limit_names { |
466 | char *name; | |
467 | char *unit; | |
468 | }; | |
469 | ||
470 | static const struct limit_names lnames[RLIM_NLIMITS] = { | |
471 | [RLIMIT_CPU] = {"Max cpu time", "ms"}, | |
472 | [RLIMIT_FSIZE] = {"Max file size", "bytes"}, | |
473 | [RLIMIT_DATA] = {"Max data size", "bytes"}, | |
474 | [RLIMIT_STACK] = {"Max stack size", "bytes"}, | |
475 | [RLIMIT_CORE] = {"Max core file size", "bytes"}, | |
476 | [RLIMIT_RSS] = {"Max resident set", "bytes"}, | |
477 | [RLIMIT_NPROC] = {"Max processes", "processes"}, | |
478 | [RLIMIT_NOFILE] = {"Max open files", "files"}, | |
479 | [RLIMIT_MEMLOCK] = {"Max locked memory", "bytes"}, | |
480 | [RLIMIT_AS] = {"Max address space", "bytes"}, | |
481 | [RLIMIT_LOCKS] = {"Max file locks", "locks"}, | |
482 | [RLIMIT_SIGPENDING] = {"Max pending signals", "signals"}, | |
483 | [RLIMIT_MSGQUEUE] = {"Max msgqueue size", "bytes"}, | |
484 | [RLIMIT_NICE] = {"Max nice priority", NULL}, | |
485 | [RLIMIT_RTPRIO] = {"Max realtime priority", NULL}, | |
8808117c | 486 | [RLIMIT_RTTIME] = {"Max realtime timeout", "us"}, |
d85f50d5 NH |
487 | }; |
488 | ||
489 | /* Display limits for a process */ | |
490 | static int proc_pid_limits(struct task_struct *task, char *buffer) | |
491 | { | |
492 | unsigned int i; | |
493 | int count = 0; | |
494 | unsigned long flags; | |
495 | char *bufptr = buffer; | |
496 | ||
497 | struct rlimit rlim[RLIM_NLIMITS]; | |
498 | ||
a6bebbc8 | 499 | if (!lock_task_sighand(task, &flags)) |
d85f50d5 | 500 | return 0; |
d85f50d5 NH |
501 | memcpy(rlim, task->signal->rlim, sizeof(struct rlimit) * RLIM_NLIMITS); |
502 | unlock_task_sighand(task, &flags); | |
d85f50d5 NH |
503 | |
504 | /* | |
505 | * print the file header | |
506 | */ | |
507 | count += sprintf(&bufptr[count], "%-25s %-20s %-20s %-10s\n", | |
508 | "Limit", "Soft Limit", "Hard Limit", "Units"); | |
509 | ||
510 | for (i = 0; i < RLIM_NLIMITS; i++) { | |
511 | if (rlim[i].rlim_cur == RLIM_INFINITY) | |
512 | count += sprintf(&bufptr[count], "%-25s %-20s ", | |
513 | lnames[i].name, "unlimited"); | |
514 | else | |
515 | count += sprintf(&bufptr[count], "%-25s %-20lu ", | |
516 | lnames[i].name, rlim[i].rlim_cur); | |
517 | ||
518 | if (rlim[i].rlim_max == RLIM_INFINITY) | |
519 | count += sprintf(&bufptr[count], "%-20s ", "unlimited"); | |
520 | else | |
521 | count += sprintf(&bufptr[count], "%-20lu ", | |
522 | rlim[i].rlim_max); | |
523 | ||
524 | if (lnames[i].unit) | |
525 | count += sprintf(&bufptr[count], "%-10s\n", | |
526 | lnames[i].unit); | |
527 | else | |
528 | count += sprintf(&bufptr[count], "\n"); | |
529 | } | |
530 | ||
531 | return count; | |
532 | } | |
533 | ||
ebcb6734 RM |
534 | #ifdef CONFIG_HAVE_ARCH_TRACEHOOK |
535 | static int proc_pid_syscall(struct task_struct *task, char *buffer) | |
536 | { | |
537 | long nr; | |
538 | unsigned long args[6], sp, pc; | |
539 | ||
540 | if (task_current_syscall(task, &nr, args, 6, &sp, &pc)) | |
541 | return sprintf(buffer, "running\n"); | |
542 | ||
543 | if (nr < 0) | |
544 | return sprintf(buffer, "%ld 0x%lx 0x%lx\n", nr, sp, pc); | |
545 | ||
546 | return sprintf(buffer, | |
547 | "%ld 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx\n", | |
548 | nr, | |
549 | args[0], args[1], args[2], args[3], args[4], args[5], | |
550 | sp, pc); | |
551 | } | |
552 | #endif /* CONFIG_HAVE_ARCH_TRACEHOOK */ | |
553 | ||
1da177e4 LT |
554 | /************************************************************************/ |
555 | /* Here the fs part begins */ | |
556 | /************************************************************************/ | |
557 | ||
558 | /* permission checks */ | |
778c1144 | 559 | static int proc_fd_access_allowed(struct inode *inode) |
1da177e4 | 560 | { |
778c1144 EB |
561 | struct task_struct *task; |
562 | int allowed = 0; | |
df26c40e EB |
563 | /* Allow access to a task's file descriptors if it is us or we |
564 | * may use ptrace attach to the process and find out that | |
565 | * information. | |
778c1144 EB |
566 | */ |
567 | task = get_proc_task(inode); | |
df26c40e | 568 | if (task) { |
006ebb40 | 569 | allowed = ptrace_may_access(task, PTRACE_MODE_READ); |
778c1144 | 570 | put_task_struct(task); |
df26c40e | 571 | } |
778c1144 | 572 | return allowed; |
1da177e4 LT |
573 | } |
574 | ||
6d76fa58 LT |
575 | static int proc_setattr(struct dentry *dentry, struct iattr *attr) |
576 | { | |
577 | int error; | |
578 | struct inode *inode = dentry->d_inode; | |
579 | ||
580 | if (attr->ia_valid & ATTR_MODE) | |
581 | return -EPERM; | |
582 | ||
583 | error = inode_change_ok(inode, attr); | |
1e8123fd JJ |
584 | if (!error) |
585 | error = inode_setattr(inode, attr); | |
6d76fa58 LT |
586 | return error; |
587 | } | |
588 | ||
c5ef1c42 | 589 | static const struct inode_operations proc_def_inode_operations = { |
6d76fa58 LT |
590 | .setattr = proc_setattr, |
591 | }; | |
592 | ||
a1a2c409 MS |
593 | static int mounts_open_common(struct inode *inode, struct file *file, |
594 | const struct seq_operations *op) | |
1da177e4 | 595 | { |
99f89551 | 596 | struct task_struct *task = get_proc_task(inode); |
cf7b708c | 597 | struct nsproxy *nsp; |
6b3286ed | 598 | struct mnt_namespace *ns = NULL; |
a1a2c409 MS |
599 | struct fs_struct *fs = NULL; |
600 | struct path root; | |
5addc5dd AV |
601 | struct proc_mounts *p; |
602 | int ret = -EINVAL; | |
1da177e4 | 603 | |
99f89551 | 604 | if (task) { |
cf7b708c PE |
605 | rcu_read_lock(); |
606 | nsp = task_nsproxy(task); | |
607 | if (nsp) { | |
608 | ns = nsp->mnt_ns; | |
863c4702 AD |
609 | if (ns) |
610 | get_mnt_ns(ns); | |
611 | } | |
cf7b708c | 612 | rcu_read_unlock(); |
a1a2c409 MS |
613 | if (ns) |
614 | fs = get_fs_struct(task); | |
99f89551 EB |
615 | put_task_struct(task); |
616 | } | |
5addc5dd | 617 | |
a1a2c409 MS |
618 | if (!ns) |
619 | goto err; | |
620 | if (!fs) | |
621 | goto err_put_ns; | |
622 | ||
623 | read_lock(&fs->lock); | |
624 | root = fs->root; | |
625 | path_get(&root); | |
626 | read_unlock(&fs->lock); | |
627 | put_fs_struct(fs); | |
628 | ||
629 | ret = -ENOMEM; | |
630 | p = kmalloc(sizeof(struct proc_mounts), GFP_KERNEL); | |
631 | if (!p) | |
632 | goto err_put_path; | |
633 | ||
634 | file->private_data = &p->m; | |
635 | ret = seq_open(file, op); | |
636 | if (ret) | |
637 | goto err_free; | |
638 | ||
639 | p->m.private = p; | |
640 | p->ns = ns; | |
641 | p->root = root; | |
642 | p->event = ns->event; | |
643 | ||
644 | return 0; | |
645 | ||
646 | err_free: | |
647 | kfree(p); | |
648 | err_put_path: | |
649 | path_put(&root); | |
650 | err_put_ns: | |
651 | put_mnt_ns(ns); | |
652 | err: | |
1da177e4 LT |
653 | return ret; |
654 | } | |
655 | ||
656 | static int mounts_release(struct inode *inode, struct file *file) | |
657 | { | |
a1a2c409 MS |
658 | struct proc_mounts *p = file->private_data; |
659 | path_put(&p->root); | |
660 | put_mnt_ns(p->ns); | |
1da177e4 LT |
661 | return seq_release(inode, file); |
662 | } | |
663 | ||
5addc5dd AV |
664 | static unsigned mounts_poll(struct file *file, poll_table *wait) |
665 | { | |
666 | struct proc_mounts *p = file->private_data; | |
a1a2c409 | 667 | struct mnt_namespace *ns = p->ns; |
5addc5dd AV |
668 | unsigned res = 0; |
669 | ||
670 | poll_wait(file, &ns->poll, wait); | |
671 | ||
672 | spin_lock(&vfsmount_lock); | |
673 | if (p->event != ns->event) { | |
674 | p->event = ns->event; | |
675 | res = POLLERR; | |
676 | } | |
677 | spin_unlock(&vfsmount_lock); | |
678 | ||
679 | return res; | |
680 | } | |
681 | ||
a1a2c409 MS |
682 | static int mounts_open(struct inode *inode, struct file *file) |
683 | { | |
684 | return mounts_open_common(inode, file, &mounts_op); | |
685 | } | |
686 | ||
00977a59 | 687 | static const struct file_operations proc_mounts_operations = { |
1da177e4 LT |
688 | .open = mounts_open, |
689 | .read = seq_read, | |
690 | .llseek = seq_lseek, | |
691 | .release = mounts_release, | |
5addc5dd | 692 | .poll = mounts_poll, |
1da177e4 LT |
693 | }; |
694 | ||
2d4d4864 RP |
695 | static int mountinfo_open(struct inode *inode, struct file *file) |
696 | { | |
697 | return mounts_open_common(inode, file, &mountinfo_op); | |
698 | } | |
699 | ||
700 | static const struct file_operations proc_mountinfo_operations = { | |
701 | .open = mountinfo_open, | |
702 | .read = seq_read, | |
703 | .llseek = seq_lseek, | |
704 | .release = mounts_release, | |
705 | .poll = mounts_poll, | |
706 | }; | |
707 | ||
b4629fe2 CL |
708 | static int mountstats_open(struct inode *inode, struct file *file) |
709 | { | |
a1a2c409 | 710 | return mounts_open_common(inode, file, &mountstats_op); |
b4629fe2 CL |
711 | } |
712 | ||
00977a59 | 713 | static const struct file_operations proc_mountstats_operations = { |
b4629fe2 CL |
714 | .open = mountstats_open, |
715 | .read = seq_read, | |
716 | .llseek = seq_lseek, | |
717 | .release = mounts_release, | |
718 | }; | |
719 | ||
1da177e4 LT |
720 | #define PROC_BLOCK_SIZE (3*1024) /* 4K page size but our output routines use some slack for overruns */ |
721 | ||
722 | static ssize_t proc_info_read(struct file * file, char __user * buf, | |
723 | size_t count, loff_t *ppos) | |
724 | { | |
2fddfeef | 725 | struct inode * inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
726 | unsigned long page; |
727 | ssize_t length; | |
99f89551 EB |
728 | struct task_struct *task = get_proc_task(inode); |
729 | ||
730 | length = -ESRCH; | |
731 | if (!task) | |
732 | goto out_no_task; | |
1da177e4 LT |
733 | |
734 | if (count > PROC_BLOCK_SIZE) | |
735 | count = PROC_BLOCK_SIZE; | |
99f89551 EB |
736 | |
737 | length = -ENOMEM; | |
e12ba74d | 738 | if (!(page = __get_free_page(GFP_TEMPORARY))) |
99f89551 | 739 | goto out; |
1da177e4 LT |
740 | |
741 | length = PROC_I(inode)->op.proc_read(task, (char*)page); | |
742 | ||
743 | if (length >= 0) | |
744 | length = simple_read_from_buffer(buf, count, ppos, (char *)page, length); | |
745 | free_page(page); | |
99f89551 EB |
746 | out: |
747 | put_task_struct(task); | |
748 | out_no_task: | |
1da177e4 LT |
749 | return length; |
750 | } | |
751 | ||
00977a59 | 752 | static const struct file_operations proc_info_file_operations = { |
1da177e4 LT |
753 | .read = proc_info_read, |
754 | }; | |
755 | ||
be614086 EB |
756 | static int proc_single_show(struct seq_file *m, void *v) |
757 | { | |
758 | struct inode *inode = m->private; | |
759 | struct pid_namespace *ns; | |
760 | struct pid *pid; | |
761 | struct task_struct *task; | |
762 | int ret; | |
763 | ||
764 | ns = inode->i_sb->s_fs_info; | |
765 | pid = proc_pid(inode); | |
766 | task = get_pid_task(pid, PIDTYPE_PID); | |
767 | if (!task) | |
768 | return -ESRCH; | |
769 | ||
770 | ret = PROC_I(inode)->op.proc_show(m, ns, pid, task); | |
771 | ||
772 | put_task_struct(task); | |
773 | return ret; | |
774 | } | |
775 | ||
776 | static int proc_single_open(struct inode *inode, struct file *filp) | |
777 | { | |
778 | int ret; | |
779 | ret = single_open(filp, proc_single_show, NULL); | |
780 | if (!ret) { | |
781 | struct seq_file *m = filp->private_data; | |
782 | ||
783 | m->private = inode; | |
784 | } | |
785 | return ret; | |
786 | } | |
787 | ||
788 | static const struct file_operations proc_single_file_operations = { | |
789 | .open = proc_single_open, | |
790 | .read = seq_read, | |
791 | .llseek = seq_lseek, | |
792 | .release = single_release, | |
793 | }; | |
794 | ||
1da177e4 LT |
795 | static int mem_open(struct inode* inode, struct file* file) |
796 | { | |
797 | file->private_data = (void*)((long)current->self_exec_id); | |
798 | return 0; | |
799 | } | |
800 | ||
801 | static ssize_t mem_read(struct file * file, char __user * buf, | |
802 | size_t count, loff_t *ppos) | |
803 | { | |
2fddfeef | 804 | struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode); |
1da177e4 LT |
805 | char *page; |
806 | unsigned long src = *ppos; | |
807 | int ret = -ESRCH; | |
808 | struct mm_struct *mm; | |
809 | ||
99f89551 EB |
810 | if (!task) |
811 | goto out_no_task; | |
812 | ||
638fa202 | 813 | if (check_mem_permission(task)) |
1da177e4 LT |
814 | goto out; |
815 | ||
816 | ret = -ENOMEM; | |
e12ba74d | 817 | page = (char *)__get_free_page(GFP_TEMPORARY); |
1da177e4 LT |
818 | if (!page) |
819 | goto out; | |
820 | ||
821 | ret = 0; | |
822 | ||
823 | mm = get_task_mm(task); | |
824 | if (!mm) | |
825 | goto out_free; | |
826 | ||
827 | ret = -EIO; | |
828 | ||
829 | if (file->private_data != (void*)((long)current->self_exec_id)) | |
830 | goto out_put; | |
831 | ||
832 | ret = 0; | |
833 | ||
834 | while (count > 0) { | |
835 | int this_len, retval; | |
836 | ||
837 | this_len = (count > PAGE_SIZE) ? PAGE_SIZE : count; | |
838 | retval = access_process_vm(task, src, page, this_len, 0); | |
638fa202 | 839 | if (!retval || check_mem_permission(task)) { |
1da177e4 LT |
840 | if (!ret) |
841 | ret = -EIO; | |
842 | break; | |
843 | } | |
844 | ||
845 | if (copy_to_user(buf, page, retval)) { | |
846 | ret = -EFAULT; | |
847 | break; | |
848 | } | |
849 | ||
850 | ret += retval; | |
851 | src += retval; | |
852 | buf += retval; | |
853 | count -= retval; | |
854 | } | |
855 | *ppos = src; | |
856 | ||
857 | out_put: | |
858 | mmput(mm); | |
859 | out_free: | |
860 | free_page((unsigned long) page); | |
861 | out: | |
99f89551 EB |
862 | put_task_struct(task); |
863 | out_no_task: | |
1da177e4 LT |
864 | return ret; |
865 | } | |
866 | ||
867 | #define mem_write NULL | |
868 | ||
869 | #ifndef mem_write | |
870 | /* This is a security hazard */ | |
63967fa9 | 871 | static ssize_t mem_write(struct file * file, const char __user *buf, |
1da177e4 LT |
872 | size_t count, loff_t *ppos) |
873 | { | |
f7ca54f4 | 874 | int copied; |
1da177e4 | 875 | char *page; |
2fddfeef | 876 | struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode); |
1da177e4 LT |
877 | unsigned long dst = *ppos; |
878 | ||
99f89551 EB |
879 | copied = -ESRCH; |
880 | if (!task) | |
881 | goto out_no_task; | |
882 | ||
638fa202 | 883 | if (check_mem_permission(task)) |
99f89551 | 884 | goto out; |
1da177e4 | 885 | |
99f89551 | 886 | copied = -ENOMEM; |
e12ba74d | 887 | page = (char *)__get_free_page(GFP_TEMPORARY); |
1da177e4 | 888 | if (!page) |
99f89551 | 889 | goto out; |
1da177e4 | 890 | |
f7ca54f4 | 891 | copied = 0; |
1da177e4 LT |
892 | while (count > 0) { |
893 | int this_len, retval; | |
894 | ||
895 | this_len = (count > PAGE_SIZE) ? PAGE_SIZE : count; | |
896 | if (copy_from_user(page, buf, this_len)) { | |
897 | copied = -EFAULT; | |
898 | break; | |
899 | } | |
900 | retval = access_process_vm(task, dst, page, this_len, 1); | |
901 | if (!retval) { | |
902 | if (!copied) | |
903 | copied = -EIO; | |
904 | break; | |
905 | } | |
906 | copied += retval; | |
907 | buf += retval; | |
908 | dst += retval; | |
909 | count -= retval; | |
910 | } | |
911 | *ppos = dst; | |
912 | free_page((unsigned long) page); | |
99f89551 EB |
913 | out: |
914 | put_task_struct(task); | |
915 | out_no_task: | |
1da177e4 LT |
916 | return copied; |
917 | } | |
918 | #endif | |
919 | ||
85863e47 | 920 | loff_t mem_lseek(struct file *file, loff_t offset, int orig) |
1da177e4 LT |
921 | { |
922 | switch (orig) { | |
923 | case 0: | |
924 | file->f_pos = offset; | |
925 | break; | |
926 | case 1: | |
927 | file->f_pos += offset; | |
928 | break; | |
929 | default: | |
930 | return -EINVAL; | |
931 | } | |
932 | force_successful_syscall_return(); | |
933 | return file->f_pos; | |
934 | } | |
935 | ||
00977a59 | 936 | static const struct file_operations proc_mem_operations = { |
1da177e4 LT |
937 | .llseek = mem_lseek, |
938 | .read = mem_read, | |
939 | .write = mem_write, | |
940 | .open = mem_open, | |
941 | }; | |
942 | ||
315e28c8 JP |
943 | static ssize_t environ_read(struct file *file, char __user *buf, |
944 | size_t count, loff_t *ppos) | |
945 | { | |
946 | struct task_struct *task = get_proc_task(file->f_dentry->d_inode); | |
947 | char *page; | |
948 | unsigned long src = *ppos; | |
949 | int ret = -ESRCH; | |
950 | struct mm_struct *mm; | |
951 | ||
952 | if (!task) | |
953 | goto out_no_task; | |
954 | ||
006ebb40 | 955 | if (!ptrace_may_access(task, PTRACE_MODE_READ)) |
315e28c8 JP |
956 | goto out; |
957 | ||
958 | ret = -ENOMEM; | |
959 | page = (char *)__get_free_page(GFP_TEMPORARY); | |
960 | if (!page) | |
961 | goto out; | |
962 | ||
963 | ret = 0; | |
964 | ||
965 | mm = get_task_mm(task); | |
966 | if (!mm) | |
967 | goto out_free; | |
968 | ||
969 | while (count > 0) { | |
970 | int this_len, retval, max_len; | |
971 | ||
972 | this_len = mm->env_end - (mm->env_start + src); | |
973 | ||
974 | if (this_len <= 0) | |
975 | break; | |
976 | ||
977 | max_len = (count > PAGE_SIZE) ? PAGE_SIZE : count; | |
978 | this_len = (this_len > max_len) ? max_len : this_len; | |
979 | ||
980 | retval = access_process_vm(task, (mm->env_start + src), | |
981 | page, this_len, 0); | |
982 | ||
983 | if (retval <= 0) { | |
984 | ret = retval; | |
985 | break; | |
986 | } | |
987 | ||
988 | if (copy_to_user(buf, page, retval)) { | |
989 | ret = -EFAULT; | |
990 | break; | |
991 | } | |
992 | ||
993 | ret += retval; | |
994 | src += retval; | |
995 | buf += retval; | |
996 | count -= retval; | |
997 | } | |
998 | *ppos = src; | |
999 | ||
1000 | mmput(mm); | |
1001 | out_free: | |
1002 | free_page((unsigned long) page); | |
1003 | out: | |
1004 | put_task_struct(task); | |
1005 | out_no_task: | |
1006 | return ret; | |
1007 | } | |
1008 | ||
1009 | static const struct file_operations proc_environ_operations = { | |
1010 | .read = environ_read, | |
1011 | }; | |
1012 | ||
1da177e4 LT |
1013 | static ssize_t oom_adjust_read(struct file *file, char __user *buf, |
1014 | size_t count, loff_t *ppos) | |
1015 | { | |
2fddfeef | 1016 | struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode); |
8578cea7 | 1017 | char buffer[PROC_NUMBUF]; |
1da177e4 | 1018 | size_t len; |
99f89551 | 1019 | int oom_adjust; |
1da177e4 | 1020 | |
99f89551 EB |
1021 | if (!task) |
1022 | return -ESRCH; | |
1023 | oom_adjust = task->oomkilladj; | |
1024 | put_task_struct(task); | |
1025 | ||
8578cea7 | 1026 | len = snprintf(buffer, sizeof(buffer), "%i\n", oom_adjust); |
0c28f287 AM |
1027 | |
1028 | return simple_read_from_buffer(buf, count, ppos, buffer, len); | |
1da177e4 LT |
1029 | } |
1030 | ||
1031 | static ssize_t oom_adjust_write(struct file *file, const char __user *buf, | |
1032 | size_t count, loff_t *ppos) | |
1033 | { | |
99f89551 | 1034 | struct task_struct *task; |
8578cea7 | 1035 | char buffer[PROC_NUMBUF], *end; |
1da177e4 LT |
1036 | int oom_adjust; |
1037 | ||
8578cea7 EB |
1038 | memset(buffer, 0, sizeof(buffer)); |
1039 | if (count > sizeof(buffer) - 1) | |
1040 | count = sizeof(buffer) - 1; | |
1da177e4 LT |
1041 | if (copy_from_user(buffer, buf, count)) |
1042 | return -EFAULT; | |
1043 | oom_adjust = simple_strtol(buffer, &end, 0); | |
8ac773b4 AD |
1044 | if ((oom_adjust < OOM_ADJUST_MIN || oom_adjust > OOM_ADJUST_MAX) && |
1045 | oom_adjust != OOM_DISABLE) | |
1da177e4 LT |
1046 | return -EINVAL; |
1047 | if (*end == '\n') | |
1048 | end++; | |
2fddfeef | 1049 | task = get_proc_task(file->f_path.dentry->d_inode); |
99f89551 EB |
1050 | if (!task) |
1051 | return -ESRCH; | |
8fb4fc68 GJ |
1052 | if (oom_adjust < task->oomkilladj && !capable(CAP_SYS_RESOURCE)) { |
1053 | put_task_struct(task); | |
1054 | return -EACCES; | |
1055 | } | |
1da177e4 | 1056 | task->oomkilladj = oom_adjust; |
99f89551 | 1057 | put_task_struct(task); |
1da177e4 LT |
1058 | if (end - buffer == 0) |
1059 | return -EIO; | |
1060 | return end - buffer; | |
1061 | } | |
1062 | ||
00977a59 | 1063 | static const struct file_operations proc_oom_adjust_operations = { |
1da177e4 LT |
1064 | .read = oom_adjust_read, |
1065 | .write = oom_adjust_write, | |
1066 | }; | |
1067 | ||
1da177e4 LT |
1068 | #ifdef CONFIG_AUDITSYSCALL |
1069 | #define TMPBUFLEN 21 | |
1070 | static ssize_t proc_loginuid_read(struct file * file, char __user * buf, | |
1071 | size_t count, loff_t *ppos) | |
1072 | { | |
2fddfeef | 1073 | struct inode * inode = file->f_path.dentry->d_inode; |
99f89551 | 1074 | struct task_struct *task = get_proc_task(inode); |
1da177e4 LT |
1075 | ssize_t length; |
1076 | char tmpbuf[TMPBUFLEN]; | |
1077 | ||
99f89551 EB |
1078 | if (!task) |
1079 | return -ESRCH; | |
1da177e4 | 1080 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", |
0c11b942 | 1081 | audit_get_loginuid(task)); |
99f89551 | 1082 | put_task_struct(task); |
1da177e4 LT |
1083 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); |
1084 | } | |
1085 | ||
1086 | static ssize_t proc_loginuid_write(struct file * file, const char __user * buf, | |
1087 | size_t count, loff_t *ppos) | |
1088 | { | |
2fddfeef | 1089 | struct inode * inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
1090 | char *page, *tmp; |
1091 | ssize_t length; | |
1da177e4 LT |
1092 | uid_t loginuid; |
1093 | ||
1094 | if (!capable(CAP_AUDIT_CONTROL)) | |
1095 | return -EPERM; | |
1096 | ||
13b41b09 | 1097 | if (current != pid_task(proc_pid(inode), PIDTYPE_PID)) |
1da177e4 LT |
1098 | return -EPERM; |
1099 | ||
e0182909 AV |
1100 | if (count >= PAGE_SIZE) |
1101 | count = PAGE_SIZE - 1; | |
1da177e4 LT |
1102 | |
1103 | if (*ppos != 0) { | |
1104 | /* No partial writes. */ | |
1105 | return -EINVAL; | |
1106 | } | |
e12ba74d | 1107 | page = (char*)__get_free_page(GFP_TEMPORARY); |
1da177e4 LT |
1108 | if (!page) |
1109 | return -ENOMEM; | |
1110 | length = -EFAULT; | |
1111 | if (copy_from_user(page, buf, count)) | |
1112 | goto out_free_page; | |
1113 | ||
e0182909 | 1114 | page[count] = '\0'; |
1da177e4 LT |
1115 | loginuid = simple_strtoul(page, &tmp, 10); |
1116 | if (tmp == page) { | |
1117 | length = -EINVAL; | |
1118 | goto out_free_page; | |
1119 | ||
1120 | } | |
99f89551 | 1121 | length = audit_set_loginuid(current, loginuid); |
1da177e4 LT |
1122 | if (likely(length == 0)) |
1123 | length = count; | |
1124 | ||
1125 | out_free_page: | |
1126 | free_page((unsigned long) page); | |
1127 | return length; | |
1128 | } | |
1129 | ||
00977a59 | 1130 | static const struct file_operations proc_loginuid_operations = { |
1da177e4 LT |
1131 | .read = proc_loginuid_read, |
1132 | .write = proc_loginuid_write, | |
1133 | }; | |
1e0bd755 EP |
1134 | |
1135 | static ssize_t proc_sessionid_read(struct file * file, char __user * buf, | |
1136 | size_t count, loff_t *ppos) | |
1137 | { | |
1138 | struct inode * inode = file->f_path.dentry->d_inode; | |
1139 | struct task_struct *task = get_proc_task(inode); | |
1140 | ssize_t length; | |
1141 | char tmpbuf[TMPBUFLEN]; | |
1142 | ||
1143 | if (!task) | |
1144 | return -ESRCH; | |
1145 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", | |
1146 | audit_get_sessionid(task)); | |
1147 | put_task_struct(task); | |
1148 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
1149 | } | |
1150 | ||
1151 | static const struct file_operations proc_sessionid_operations = { | |
1152 | .read = proc_sessionid_read, | |
1153 | }; | |
1da177e4 LT |
1154 | #endif |
1155 | ||
f4f154fd AM |
1156 | #ifdef CONFIG_FAULT_INJECTION |
1157 | static ssize_t proc_fault_inject_read(struct file * file, char __user * buf, | |
1158 | size_t count, loff_t *ppos) | |
1159 | { | |
1160 | struct task_struct *task = get_proc_task(file->f_dentry->d_inode); | |
1161 | char buffer[PROC_NUMBUF]; | |
1162 | size_t len; | |
1163 | int make_it_fail; | |
f4f154fd AM |
1164 | |
1165 | if (!task) | |
1166 | return -ESRCH; | |
1167 | make_it_fail = task->make_it_fail; | |
1168 | put_task_struct(task); | |
1169 | ||
1170 | len = snprintf(buffer, sizeof(buffer), "%i\n", make_it_fail); | |
0c28f287 AM |
1171 | |
1172 | return simple_read_from_buffer(buf, count, ppos, buffer, len); | |
f4f154fd AM |
1173 | } |
1174 | ||
1175 | static ssize_t proc_fault_inject_write(struct file * file, | |
1176 | const char __user * buf, size_t count, loff_t *ppos) | |
1177 | { | |
1178 | struct task_struct *task; | |
1179 | char buffer[PROC_NUMBUF], *end; | |
1180 | int make_it_fail; | |
1181 | ||
1182 | if (!capable(CAP_SYS_RESOURCE)) | |
1183 | return -EPERM; | |
1184 | memset(buffer, 0, sizeof(buffer)); | |
1185 | if (count > sizeof(buffer) - 1) | |
1186 | count = sizeof(buffer) - 1; | |
1187 | if (copy_from_user(buffer, buf, count)) | |
1188 | return -EFAULT; | |
1189 | make_it_fail = simple_strtol(buffer, &end, 0); | |
1190 | if (*end == '\n') | |
1191 | end++; | |
1192 | task = get_proc_task(file->f_dentry->d_inode); | |
1193 | if (!task) | |
1194 | return -ESRCH; | |
1195 | task->make_it_fail = make_it_fail; | |
1196 | put_task_struct(task); | |
1197 | if (end - buffer == 0) | |
1198 | return -EIO; | |
1199 | return end - buffer; | |
1200 | } | |
1201 | ||
00977a59 | 1202 | static const struct file_operations proc_fault_inject_operations = { |
f4f154fd AM |
1203 | .read = proc_fault_inject_read, |
1204 | .write = proc_fault_inject_write, | |
1205 | }; | |
1206 | #endif | |
1207 | ||
9745512c | 1208 | |
43ae34cb IM |
1209 | #ifdef CONFIG_SCHED_DEBUG |
1210 | /* | |
1211 | * Print out various scheduling related per-task fields: | |
1212 | */ | |
1213 | static int sched_show(struct seq_file *m, void *v) | |
1214 | { | |
1215 | struct inode *inode = m->private; | |
1216 | struct task_struct *p; | |
1217 | ||
43ae34cb IM |
1218 | p = get_proc_task(inode); |
1219 | if (!p) | |
1220 | return -ESRCH; | |
1221 | proc_sched_show_task(p, m); | |
1222 | ||
1223 | put_task_struct(p); | |
1224 | ||
1225 | return 0; | |
1226 | } | |
1227 | ||
1228 | static ssize_t | |
1229 | sched_write(struct file *file, const char __user *buf, | |
1230 | size_t count, loff_t *offset) | |
1231 | { | |
1232 | struct inode *inode = file->f_path.dentry->d_inode; | |
1233 | struct task_struct *p; | |
1234 | ||
43ae34cb IM |
1235 | p = get_proc_task(inode); |
1236 | if (!p) | |
1237 | return -ESRCH; | |
1238 | proc_sched_set_task(p); | |
1239 | ||
1240 | put_task_struct(p); | |
1241 | ||
1242 | return count; | |
1243 | } | |
1244 | ||
1245 | static int sched_open(struct inode *inode, struct file *filp) | |
1246 | { | |
1247 | int ret; | |
1248 | ||
1249 | ret = single_open(filp, sched_show, NULL); | |
1250 | if (!ret) { | |
1251 | struct seq_file *m = filp->private_data; | |
1252 | ||
1253 | m->private = inode; | |
1254 | } | |
1255 | return ret; | |
1256 | } | |
1257 | ||
1258 | static const struct file_operations proc_pid_sched_operations = { | |
1259 | .open = sched_open, | |
1260 | .read = seq_read, | |
1261 | .write = sched_write, | |
1262 | .llseek = seq_lseek, | |
5ea473a1 | 1263 | .release = single_release, |
43ae34cb IM |
1264 | }; |
1265 | ||
1266 | #endif | |
1267 | ||
925d1c40 MH |
1268 | /* |
1269 | * We added or removed a vma mapping the executable. The vmas are only mapped | |
1270 | * during exec and are not mapped with the mmap system call. | |
1271 | * Callers must hold down_write() on the mm's mmap_sem for these | |
1272 | */ | |
1273 | void added_exe_file_vma(struct mm_struct *mm) | |
1274 | { | |
1275 | mm->num_exe_file_vmas++; | |
1276 | } | |
1277 | ||
1278 | void removed_exe_file_vma(struct mm_struct *mm) | |
1279 | { | |
1280 | mm->num_exe_file_vmas--; | |
1281 | if ((mm->num_exe_file_vmas == 0) && mm->exe_file){ | |
1282 | fput(mm->exe_file); | |
1283 | mm->exe_file = NULL; | |
1284 | } | |
1285 | ||
1286 | } | |
1287 | ||
1288 | void set_mm_exe_file(struct mm_struct *mm, struct file *new_exe_file) | |
1289 | { | |
1290 | if (new_exe_file) | |
1291 | get_file(new_exe_file); | |
1292 | if (mm->exe_file) | |
1293 | fput(mm->exe_file); | |
1294 | mm->exe_file = new_exe_file; | |
1295 | mm->num_exe_file_vmas = 0; | |
1296 | } | |
1297 | ||
1298 | struct file *get_mm_exe_file(struct mm_struct *mm) | |
1299 | { | |
1300 | struct file *exe_file; | |
1301 | ||
1302 | /* We need mmap_sem to protect against races with removal of | |
1303 | * VM_EXECUTABLE vmas */ | |
1304 | down_read(&mm->mmap_sem); | |
1305 | exe_file = mm->exe_file; | |
1306 | if (exe_file) | |
1307 | get_file(exe_file); | |
1308 | up_read(&mm->mmap_sem); | |
1309 | return exe_file; | |
1310 | } | |
1311 | ||
1312 | void dup_mm_exe_file(struct mm_struct *oldmm, struct mm_struct *newmm) | |
1313 | { | |
1314 | /* It's safe to write the exe_file pointer without exe_file_lock because | |
1315 | * this is called during fork when the task is not yet in /proc */ | |
1316 | newmm->exe_file = get_mm_exe_file(oldmm); | |
1317 | } | |
1318 | ||
1319 | static int proc_exe_link(struct inode *inode, struct path *exe_path) | |
1320 | { | |
1321 | struct task_struct *task; | |
1322 | struct mm_struct *mm; | |
1323 | struct file *exe_file; | |
1324 | ||
1325 | task = get_proc_task(inode); | |
1326 | if (!task) | |
1327 | return -ENOENT; | |
1328 | mm = get_task_mm(task); | |
1329 | put_task_struct(task); | |
1330 | if (!mm) | |
1331 | return -ENOENT; | |
1332 | exe_file = get_mm_exe_file(mm); | |
1333 | mmput(mm); | |
1334 | if (exe_file) { | |
1335 | *exe_path = exe_file->f_path; | |
1336 | path_get(&exe_file->f_path); | |
1337 | fput(exe_file); | |
1338 | return 0; | |
1339 | } else | |
1340 | return -ENOENT; | |
1341 | } | |
1342 | ||
008b150a | 1343 | static void *proc_pid_follow_link(struct dentry *dentry, struct nameidata *nd) |
1da177e4 LT |
1344 | { |
1345 | struct inode *inode = dentry->d_inode; | |
1346 | int error = -EACCES; | |
1347 | ||
1348 | /* We don't need a base pointer in the /proc filesystem */ | |
1d957f9b | 1349 | path_put(&nd->path); |
1da177e4 | 1350 | |
778c1144 EB |
1351 | /* Are we allowed to snoop on the tasks file descriptors? */ |
1352 | if (!proc_fd_access_allowed(inode)) | |
1da177e4 | 1353 | goto out; |
1da177e4 | 1354 | |
3dcd25f3 | 1355 | error = PROC_I(inode)->op.proc_get_link(inode, &nd->path); |
1da177e4 LT |
1356 | nd->last_type = LAST_BIND; |
1357 | out: | |
008b150a | 1358 | return ERR_PTR(error); |
1da177e4 LT |
1359 | } |
1360 | ||
3dcd25f3 | 1361 | static int do_proc_readlink(struct path *path, char __user *buffer, int buflen) |
1da177e4 | 1362 | { |
e12ba74d | 1363 | char *tmp = (char*)__get_free_page(GFP_TEMPORARY); |
3dcd25f3 | 1364 | char *pathname; |
1da177e4 LT |
1365 | int len; |
1366 | ||
1367 | if (!tmp) | |
1368 | return -ENOMEM; | |
0c28f287 | 1369 | |
cf28b486 | 1370 | pathname = d_path(path, tmp, PAGE_SIZE); |
3dcd25f3 JB |
1371 | len = PTR_ERR(pathname); |
1372 | if (IS_ERR(pathname)) | |
1da177e4 | 1373 | goto out; |
3dcd25f3 | 1374 | len = tmp + PAGE_SIZE - 1 - pathname; |
1da177e4 LT |
1375 | |
1376 | if (len > buflen) | |
1377 | len = buflen; | |
3dcd25f3 | 1378 | if (copy_to_user(buffer, pathname, len)) |
1da177e4 LT |
1379 | len = -EFAULT; |
1380 | out: | |
1381 | free_page((unsigned long)tmp); | |
1382 | return len; | |
1383 | } | |
1384 | ||
1385 | static int proc_pid_readlink(struct dentry * dentry, char __user * buffer, int buflen) | |
1386 | { | |
1387 | int error = -EACCES; | |
1388 | struct inode *inode = dentry->d_inode; | |
3dcd25f3 | 1389 | struct path path; |
1da177e4 | 1390 | |
778c1144 EB |
1391 | /* Are we allowed to snoop on the tasks file descriptors? */ |
1392 | if (!proc_fd_access_allowed(inode)) | |
1da177e4 | 1393 | goto out; |
1da177e4 | 1394 | |
3dcd25f3 | 1395 | error = PROC_I(inode)->op.proc_get_link(inode, &path); |
1da177e4 LT |
1396 | if (error) |
1397 | goto out; | |
1398 | ||
3dcd25f3 JB |
1399 | error = do_proc_readlink(&path, buffer, buflen); |
1400 | path_put(&path); | |
1da177e4 | 1401 | out: |
1da177e4 LT |
1402 | return error; |
1403 | } | |
1404 | ||
c5ef1c42 | 1405 | static const struct inode_operations proc_pid_link_inode_operations = { |
1da177e4 | 1406 | .readlink = proc_pid_readlink, |
6d76fa58 LT |
1407 | .follow_link = proc_pid_follow_link, |
1408 | .setattr = proc_setattr, | |
1da177e4 LT |
1409 | }; |
1410 | ||
28a6d671 EB |
1411 | |
1412 | /* building an inode */ | |
1413 | ||
1414 | static int task_dumpable(struct task_struct *task) | |
1da177e4 | 1415 | { |
28a6d671 EB |
1416 | int dumpable = 0; |
1417 | struct mm_struct *mm; | |
1da177e4 | 1418 | |
28a6d671 EB |
1419 | task_lock(task); |
1420 | mm = task->mm; | |
1421 | if (mm) | |
6c5d5238 | 1422 | dumpable = get_dumpable(mm); |
28a6d671 EB |
1423 | task_unlock(task); |
1424 | if(dumpable == 1) | |
1425 | return 1; | |
1426 | return 0; | |
1427 | } | |
1da177e4 | 1428 | |
1da177e4 | 1429 | |
61a28784 | 1430 | static struct inode *proc_pid_make_inode(struct super_block * sb, struct task_struct *task) |
28a6d671 EB |
1431 | { |
1432 | struct inode * inode; | |
1433 | struct proc_inode *ei; | |
c69e8d9c | 1434 | const struct cred *cred; |
1da177e4 | 1435 | |
28a6d671 | 1436 | /* We need a new inode */ |
1da177e4 | 1437 | |
28a6d671 EB |
1438 | inode = new_inode(sb); |
1439 | if (!inode) | |
1440 | goto out; | |
1441 | ||
1442 | /* Common stuff */ | |
1443 | ei = PROC_I(inode); | |
1444 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; | |
28a6d671 EB |
1445 | inode->i_op = &proc_def_inode_operations; |
1446 | ||
1447 | /* | |
1448 | * grab the reference to task. | |
1449 | */ | |
1a657f78 | 1450 | ei->pid = get_task_pid(task, PIDTYPE_PID); |
28a6d671 EB |
1451 | if (!ei->pid) |
1452 | goto out_unlock; | |
1453 | ||
1454 | inode->i_uid = 0; | |
1455 | inode->i_gid = 0; | |
1456 | if (task_dumpable(task)) { | |
c69e8d9c DH |
1457 | rcu_read_lock(); |
1458 | cred = __task_cred(task); | |
1459 | inode->i_uid = cred->euid; | |
1460 | inode->i_gid = cred->egid; | |
1461 | rcu_read_unlock(); | |
1da177e4 | 1462 | } |
28a6d671 EB |
1463 | security_task_to_inode(task, inode); |
1464 | ||
1da177e4 | 1465 | out: |
28a6d671 EB |
1466 | return inode; |
1467 | ||
1468 | out_unlock: | |
1469 | iput(inode); | |
1470 | return NULL; | |
1da177e4 LT |
1471 | } |
1472 | ||
28a6d671 | 1473 | static int pid_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) |
1da177e4 | 1474 | { |
1da177e4 | 1475 | struct inode *inode = dentry->d_inode; |
28a6d671 | 1476 | struct task_struct *task; |
c69e8d9c DH |
1477 | const struct cred *cred; |
1478 | ||
28a6d671 | 1479 | generic_fillattr(inode, stat); |
1da177e4 | 1480 | |
28a6d671 EB |
1481 | rcu_read_lock(); |
1482 | stat->uid = 0; | |
1483 | stat->gid = 0; | |
1484 | task = pid_task(proc_pid(inode), PIDTYPE_PID); | |
1485 | if (task) { | |
1486 | if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) || | |
1487 | task_dumpable(task)) { | |
c69e8d9c DH |
1488 | cred = __task_cred(task); |
1489 | stat->uid = cred->euid; | |
1490 | stat->gid = cred->egid; | |
1da177e4 LT |
1491 | } |
1492 | } | |
28a6d671 | 1493 | rcu_read_unlock(); |
d6e71144 | 1494 | return 0; |
1da177e4 LT |
1495 | } |
1496 | ||
1da177e4 LT |
1497 | /* dentry stuff */ |
1498 | ||
1499 | /* | |
1500 | * Exceptional case: normally we are not allowed to unhash a busy | |
1501 | * directory. In this case, however, we can do it - no aliasing problems | |
1502 | * due to the way we treat inodes. | |
1503 | * | |
1504 | * Rewrite the inode's ownerships here because the owning task may have | |
1505 | * performed a setuid(), etc. | |
99f89551 EB |
1506 | * |
1507 | * Before the /proc/pid/status file was created the only way to read | |
1508 | * the effective uid of a /process was to stat /proc/pid. Reading | |
1509 | * /proc/pid/status is slow enough that procps and other packages | |
1510 | * kept stating /proc/pid. To keep the rules in /proc simple I have | |
1511 | * made this apply to all per process world readable and executable | |
1512 | * directories. | |
1da177e4 LT |
1513 | */ |
1514 | static int pid_revalidate(struct dentry *dentry, struct nameidata *nd) | |
1515 | { | |
1516 | struct inode *inode = dentry->d_inode; | |
99f89551 | 1517 | struct task_struct *task = get_proc_task(inode); |
c69e8d9c DH |
1518 | const struct cred *cred; |
1519 | ||
99f89551 EB |
1520 | if (task) { |
1521 | if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) || | |
1522 | task_dumpable(task)) { | |
c69e8d9c DH |
1523 | rcu_read_lock(); |
1524 | cred = __task_cred(task); | |
1525 | inode->i_uid = cred->euid; | |
1526 | inode->i_gid = cred->egid; | |
1527 | rcu_read_unlock(); | |
1da177e4 LT |
1528 | } else { |
1529 | inode->i_uid = 0; | |
1530 | inode->i_gid = 0; | |
1531 | } | |
9ee8ab9f | 1532 | inode->i_mode &= ~(S_ISUID | S_ISGID); |
1da177e4 | 1533 | security_task_to_inode(task, inode); |
99f89551 | 1534 | put_task_struct(task); |
1da177e4 LT |
1535 | return 1; |
1536 | } | |
1537 | d_drop(dentry); | |
1538 | return 0; | |
1539 | } | |
1540 | ||
28a6d671 | 1541 | static int pid_delete_dentry(struct dentry * dentry) |
99f89551 | 1542 | { |
28a6d671 EB |
1543 | /* Is the task we represent dead? |
1544 | * If so, then don't put the dentry on the lru list, | |
1545 | * kill it immediately. | |
1546 | */ | |
1547 | return !proc_pid(dentry->d_inode)->tasks[PIDTYPE_PID].first; | |
1548 | } | |
1549 | ||
1550 | static struct dentry_operations pid_dentry_operations = | |
1551 | { | |
1552 | .d_revalidate = pid_revalidate, | |
1553 | .d_delete = pid_delete_dentry, | |
1554 | }; | |
1555 | ||
1556 | /* Lookups */ | |
1557 | ||
c5141e6d ED |
1558 | typedef struct dentry *instantiate_t(struct inode *, struct dentry *, |
1559 | struct task_struct *, const void *); | |
61a28784 | 1560 | |
1c0d04c9 EB |
1561 | /* |
1562 | * Fill a directory entry. | |
1563 | * | |
1564 | * If possible create the dcache entry and derive our inode number and | |
1565 | * file type from dcache entry. | |
1566 | * | |
1567 | * Since all of the proc inode numbers are dynamically generated, the inode | |
1568 | * numbers do not exist until the inode is cache. This means creating the | |
1569 | * the dcache entry in readdir is necessary to keep the inode numbers | |
1570 | * reported by readdir in sync with the inode numbers reported | |
1571 | * by stat. | |
1572 | */ | |
61a28784 EB |
1573 | static int proc_fill_cache(struct file *filp, void *dirent, filldir_t filldir, |
1574 | char *name, int len, | |
c5141e6d | 1575 | instantiate_t instantiate, struct task_struct *task, const void *ptr) |
61a28784 | 1576 | { |
2fddfeef | 1577 | struct dentry *child, *dir = filp->f_path.dentry; |
61a28784 EB |
1578 | struct inode *inode; |
1579 | struct qstr qname; | |
1580 | ino_t ino = 0; | |
1581 | unsigned type = DT_UNKNOWN; | |
1582 | ||
1583 | qname.name = name; | |
1584 | qname.len = len; | |
1585 | qname.hash = full_name_hash(name, len); | |
1586 | ||
1587 | child = d_lookup(dir, &qname); | |
1588 | if (!child) { | |
1589 | struct dentry *new; | |
1590 | new = d_alloc(dir, &qname); | |
1591 | if (new) { | |
1592 | child = instantiate(dir->d_inode, new, task, ptr); | |
1593 | if (child) | |
1594 | dput(new); | |
1595 | else | |
1596 | child = new; | |
1597 | } | |
1598 | } | |
1599 | if (!child || IS_ERR(child) || !child->d_inode) | |
1600 | goto end_instantiate; | |
1601 | inode = child->d_inode; | |
1602 | if (inode) { | |
1603 | ino = inode->i_ino; | |
1604 | type = inode->i_mode >> 12; | |
1605 | } | |
1606 | dput(child); | |
1607 | end_instantiate: | |
1608 | if (!ino) | |
1609 | ino = find_inode_number(dir, &qname); | |
1610 | if (!ino) | |
1611 | ino = 1; | |
1612 | return filldir(dirent, name, len, filp->f_pos, ino, type); | |
1613 | } | |
1614 | ||
28a6d671 EB |
1615 | static unsigned name_to_int(struct dentry *dentry) |
1616 | { | |
1617 | const char *name = dentry->d_name.name; | |
1618 | int len = dentry->d_name.len; | |
1619 | unsigned n = 0; | |
1620 | ||
1621 | if (len > 1 && *name == '0') | |
1622 | goto out; | |
1623 | while (len-- > 0) { | |
1624 | unsigned c = *name++ - '0'; | |
1625 | if (c > 9) | |
1626 | goto out; | |
1627 | if (n >= (~0U-9)/10) | |
1628 | goto out; | |
1629 | n *= 10; | |
1630 | n += c; | |
1631 | } | |
1632 | return n; | |
1633 | out: | |
1634 | return ~0U; | |
1635 | } | |
1636 | ||
27932742 MS |
1637 | #define PROC_FDINFO_MAX 64 |
1638 | ||
3dcd25f3 | 1639 | static int proc_fd_info(struct inode *inode, struct path *path, char *info) |
28a6d671 EB |
1640 | { |
1641 | struct task_struct *task = get_proc_task(inode); | |
1642 | struct files_struct *files = NULL; | |
1643 | struct file *file; | |
1644 | int fd = proc_fd(inode); | |
99f89551 | 1645 | |
99f89551 | 1646 | if (task) { |
28a6d671 EB |
1647 | files = get_files_struct(task); |
1648 | put_task_struct(task); | |
1649 | } | |
1650 | if (files) { | |
1651 | /* | |
1652 | * We are not taking a ref to the file structure, so we must | |
1653 | * hold ->file_lock. | |
1654 | */ | |
1655 | spin_lock(&files->file_lock); | |
1656 | file = fcheck_files(files, fd); | |
1657 | if (file) { | |
3dcd25f3 JB |
1658 | if (path) { |
1659 | *path = file->f_path; | |
1660 | path_get(&file->f_path); | |
1661 | } | |
27932742 MS |
1662 | if (info) |
1663 | snprintf(info, PROC_FDINFO_MAX, | |
1664 | "pos:\t%lli\n" | |
1665 | "flags:\t0%o\n", | |
1666 | (long long) file->f_pos, | |
1667 | file->f_flags); | |
28a6d671 EB |
1668 | spin_unlock(&files->file_lock); |
1669 | put_files_struct(files); | |
1670 | return 0; | |
99f89551 | 1671 | } |
28a6d671 EB |
1672 | spin_unlock(&files->file_lock); |
1673 | put_files_struct(files); | |
99f89551 | 1674 | } |
28a6d671 | 1675 | return -ENOENT; |
99f89551 EB |
1676 | } |
1677 | ||
3dcd25f3 | 1678 | static int proc_fd_link(struct inode *inode, struct path *path) |
27932742 | 1679 | { |
3dcd25f3 | 1680 | return proc_fd_info(inode, path, NULL); |
27932742 MS |
1681 | } |
1682 | ||
1da177e4 LT |
1683 | static int tid_fd_revalidate(struct dentry *dentry, struct nameidata *nd) |
1684 | { | |
1685 | struct inode *inode = dentry->d_inode; | |
99f89551 | 1686 | struct task_struct *task = get_proc_task(inode); |
aed7a6c4 | 1687 | int fd = proc_fd(inode); |
1da177e4 | 1688 | struct files_struct *files; |
c69e8d9c | 1689 | const struct cred *cred; |
1da177e4 | 1690 | |
99f89551 EB |
1691 | if (task) { |
1692 | files = get_files_struct(task); | |
1693 | if (files) { | |
1694 | rcu_read_lock(); | |
1695 | if (fcheck_files(files, fd)) { | |
1696 | rcu_read_unlock(); | |
1697 | put_files_struct(files); | |
1698 | if (task_dumpable(task)) { | |
c69e8d9c DH |
1699 | rcu_read_lock(); |
1700 | cred = __task_cred(task); | |
1701 | inode->i_uid = cred->euid; | |
1702 | inode->i_gid = cred->egid; | |
1703 | rcu_read_unlock(); | |
99f89551 EB |
1704 | } else { |
1705 | inode->i_uid = 0; | |
1706 | inode->i_gid = 0; | |
1707 | } | |
9ee8ab9f | 1708 | inode->i_mode &= ~(S_ISUID | S_ISGID); |
99f89551 EB |
1709 | security_task_to_inode(task, inode); |
1710 | put_task_struct(task); | |
1711 | return 1; | |
1712 | } | |
b835996f | 1713 | rcu_read_unlock(); |
1da177e4 | 1714 | put_files_struct(files); |
1da177e4 | 1715 | } |
99f89551 | 1716 | put_task_struct(task); |
1da177e4 LT |
1717 | } |
1718 | d_drop(dentry); | |
1719 | return 0; | |
1720 | } | |
1721 | ||
1da177e4 LT |
1722 | static struct dentry_operations tid_fd_dentry_operations = |
1723 | { | |
1724 | .d_revalidate = tid_fd_revalidate, | |
1725 | .d_delete = pid_delete_dentry, | |
1726 | }; | |
1727 | ||
444ceed8 | 1728 | static struct dentry *proc_fd_instantiate(struct inode *dir, |
c5141e6d | 1729 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
1da177e4 | 1730 | { |
c5141e6d | 1731 | unsigned fd = *(const unsigned *)ptr; |
444ceed8 EB |
1732 | struct file *file; |
1733 | struct files_struct *files; | |
1734 | struct inode *inode; | |
1735 | struct proc_inode *ei; | |
1736 | struct dentry *error = ERR_PTR(-ENOENT); | |
1da177e4 | 1737 | |
61a28784 | 1738 | inode = proc_pid_make_inode(dir->i_sb, task); |
1da177e4 LT |
1739 | if (!inode) |
1740 | goto out; | |
1741 | ei = PROC_I(inode); | |
aed7a6c4 | 1742 | ei->fd = fd; |
1da177e4 LT |
1743 | files = get_files_struct(task); |
1744 | if (!files) | |
444ceed8 | 1745 | goto out_iput; |
1da177e4 | 1746 | inode->i_mode = S_IFLNK; |
ca99c1da DS |
1747 | |
1748 | /* | |
1749 | * We are not taking a ref to the file structure, so we must | |
1750 | * hold ->file_lock. | |
1751 | */ | |
1752 | spin_lock(&files->file_lock); | |
1da177e4 LT |
1753 | file = fcheck_files(files, fd); |
1754 | if (!file) | |
444ceed8 | 1755 | goto out_unlock; |
aeb5d727 | 1756 | if (file->f_mode & FMODE_READ) |
1da177e4 | 1757 | inode->i_mode |= S_IRUSR | S_IXUSR; |
aeb5d727 | 1758 | if (file->f_mode & FMODE_WRITE) |
1da177e4 | 1759 | inode->i_mode |= S_IWUSR | S_IXUSR; |
ca99c1da | 1760 | spin_unlock(&files->file_lock); |
1da177e4 | 1761 | put_files_struct(files); |
444ceed8 | 1762 | |
1da177e4 LT |
1763 | inode->i_op = &proc_pid_link_inode_operations; |
1764 | inode->i_size = 64; | |
1765 | ei->op.proc_get_link = proc_fd_link; | |
1766 | dentry->d_op = &tid_fd_dentry_operations; | |
1767 | d_add(dentry, inode); | |
cd6a3ce9 EB |
1768 | /* Close the race of the process dying before we return the dentry */ |
1769 | if (tid_fd_revalidate(dentry, NULL)) | |
444ceed8 | 1770 | error = NULL; |
1da177e4 | 1771 | |
444ceed8 EB |
1772 | out: |
1773 | return error; | |
1774 | out_unlock: | |
ca99c1da | 1775 | spin_unlock(&files->file_lock); |
1da177e4 | 1776 | put_files_struct(files); |
444ceed8 | 1777 | out_iput: |
1da177e4 | 1778 | iput(inode); |
cd6a3ce9 | 1779 | goto out; |
1da177e4 LT |
1780 | } |
1781 | ||
27932742 MS |
1782 | static struct dentry *proc_lookupfd_common(struct inode *dir, |
1783 | struct dentry *dentry, | |
1784 | instantiate_t instantiate) | |
444ceed8 EB |
1785 | { |
1786 | struct task_struct *task = get_proc_task(dir); | |
1787 | unsigned fd = name_to_int(dentry); | |
1788 | struct dentry *result = ERR_PTR(-ENOENT); | |
1789 | ||
1790 | if (!task) | |
1791 | goto out_no_task; | |
1792 | if (fd == ~0U) | |
1793 | goto out; | |
1794 | ||
27932742 | 1795 | result = instantiate(dir, dentry, task, &fd); |
444ceed8 EB |
1796 | out: |
1797 | put_task_struct(task); | |
1798 | out_no_task: | |
1799 | return result; | |
1800 | } | |
1801 | ||
27932742 MS |
1802 | static int proc_readfd_common(struct file * filp, void * dirent, |
1803 | filldir_t filldir, instantiate_t instantiate) | |
28a6d671 | 1804 | { |
2fddfeef | 1805 | struct dentry *dentry = filp->f_path.dentry; |
28a6d671 EB |
1806 | struct inode *inode = dentry->d_inode; |
1807 | struct task_struct *p = get_proc_task(inode); | |
457c2510 | 1808 | unsigned int fd, ino; |
28a6d671 | 1809 | int retval; |
28a6d671 | 1810 | struct files_struct * files; |
1da177e4 | 1811 | |
28a6d671 EB |
1812 | retval = -ENOENT; |
1813 | if (!p) | |
1814 | goto out_no_task; | |
1815 | retval = 0; | |
28a6d671 EB |
1816 | |
1817 | fd = filp->f_pos; | |
1818 | switch (fd) { | |
1819 | case 0: | |
1820 | if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0) | |
1821 | goto out; | |
1822 | filp->f_pos++; | |
1823 | case 1: | |
1824 | ino = parent_ino(dentry); | |
1825 | if (filldir(dirent, "..", 2, 1, ino, DT_DIR) < 0) | |
1826 | goto out; | |
1827 | filp->f_pos++; | |
1828 | default: | |
1829 | files = get_files_struct(p); | |
1830 | if (!files) | |
1831 | goto out; | |
1832 | rcu_read_lock(); | |
28a6d671 | 1833 | for (fd = filp->f_pos-2; |
9b4f526c | 1834 | fd < files_fdtable(files)->max_fds; |
28a6d671 | 1835 | fd++, filp->f_pos++) { |
27932742 MS |
1836 | char name[PROC_NUMBUF]; |
1837 | int len; | |
28a6d671 EB |
1838 | |
1839 | if (!fcheck_files(files, fd)) | |
1840 | continue; | |
1841 | rcu_read_unlock(); | |
1842 | ||
27932742 MS |
1843 | len = snprintf(name, sizeof(name), "%d", fd); |
1844 | if (proc_fill_cache(filp, dirent, filldir, | |
1845 | name, len, instantiate, | |
1846 | p, &fd) < 0) { | |
28a6d671 EB |
1847 | rcu_read_lock(); |
1848 | break; | |
1849 | } | |
1850 | rcu_read_lock(); | |
1851 | } | |
1852 | rcu_read_unlock(); | |
1853 | put_files_struct(files); | |
1854 | } | |
1855 | out: | |
1856 | put_task_struct(p); | |
1857 | out_no_task: | |
1858 | return retval; | |
1859 | } | |
1860 | ||
27932742 MS |
1861 | static struct dentry *proc_lookupfd(struct inode *dir, struct dentry *dentry, |
1862 | struct nameidata *nd) | |
1863 | { | |
1864 | return proc_lookupfd_common(dir, dentry, proc_fd_instantiate); | |
1865 | } | |
1866 | ||
1867 | static int proc_readfd(struct file *filp, void *dirent, filldir_t filldir) | |
1868 | { | |
1869 | return proc_readfd_common(filp, dirent, filldir, proc_fd_instantiate); | |
1870 | } | |
1871 | ||
1872 | static ssize_t proc_fdinfo_read(struct file *file, char __user *buf, | |
1873 | size_t len, loff_t *ppos) | |
1874 | { | |
1875 | char tmp[PROC_FDINFO_MAX]; | |
3dcd25f3 | 1876 | int err = proc_fd_info(file->f_path.dentry->d_inode, NULL, tmp); |
27932742 MS |
1877 | if (!err) |
1878 | err = simple_read_from_buffer(buf, len, ppos, tmp, strlen(tmp)); | |
1879 | return err; | |
1880 | } | |
1881 | ||
1882 | static const struct file_operations proc_fdinfo_file_operations = { | |
1883 | .open = nonseekable_open, | |
1884 | .read = proc_fdinfo_read, | |
1885 | }; | |
1886 | ||
00977a59 | 1887 | static const struct file_operations proc_fd_operations = { |
28a6d671 EB |
1888 | .read = generic_read_dir, |
1889 | .readdir = proc_readfd, | |
1da177e4 LT |
1890 | }; |
1891 | ||
8948e11f AD |
1892 | /* |
1893 | * /proc/pid/fd needs a special permission handler so that a process can still | |
1894 | * access /proc/self/fd after it has executed a setuid(). | |
1895 | */ | |
e6305c43 | 1896 | static int proc_fd_permission(struct inode *inode, int mask) |
8948e11f AD |
1897 | { |
1898 | int rv; | |
1899 | ||
1900 | rv = generic_permission(inode, mask, NULL); | |
1901 | if (rv == 0) | |
1902 | return 0; | |
1903 | if (task_pid(current) == proc_pid(inode)) | |
1904 | rv = 0; | |
1905 | return rv; | |
1906 | } | |
1907 | ||
1da177e4 LT |
1908 | /* |
1909 | * proc directories can do almost nothing.. | |
1910 | */ | |
c5ef1c42 | 1911 | static const struct inode_operations proc_fd_inode_operations = { |
1da177e4 | 1912 | .lookup = proc_lookupfd, |
8948e11f | 1913 | .permission = proc_fd_permission, |
6d76fa58 | 1914 | .setattr = proc_setattr, |
1da177e4 LT |
1915 | }; |
1916 | ||
27932742 MS |
1917 | static struct dentry *proc_fdinfo_instantiate(struct inode *dir, |
1918 | struct dentry *dentry, struct task_struct *task, const void *ptr) | |
1919 | { | |
1920 | unsigned fd = *(unsigned *)ptr; | |
1921 | struct inode *inode; | |
1922 | struct proc_inode *ei; | |
1923 | struct dentry *error = ERR_PTR(-ENOENT); | |
1924 | ||
1925 | inode = proc_pid_make_inode(dir->i_sb, task); | |
1926 | if (!inode) | |
1927 | goto out; | |
1928 | ei = PROC_I(inode); | |
1929 | ei->fd = fd; | |
1930 | inode->i_mode = S_IFREG | S_IRUSR; | |
1931 | inode->i_fop = &proc_fdinfo_file_operations; | |
1932 | dentry->d_op = &tid_fd_dentry_operations; | |
1933 | d_add(dentry, inode); | |
1934 | /* Close the race of the process dying before we return the dentry */ | |
1935 | if (tid_fd_revalidate(dentry, NULL)) | |
1936 | error = NULL; | |
1937 | ||
1938 | out: | |
1939 | return error; | |
1940 | } | |
1941 | ||
1942 | static struct dentry *proc_lookupfdinfo(struct inode *dir, | |
1943 | struct dentry *dentry, | |
1944 | struct nameidata *nd) | |
1945 | { | |
1946 | return proc_lookupfd_common(dir, dentry, proc_fdinfo_instantiate); | |
1947 | } | |
1948 | ||
1949 | static int proc_readfdinfo(struct file *filp, void *dirent, filldir_t filldir) | |
1950 | { | |
1951 | return proc_readfd_common(filp, dirent, filldir, | |
1952 | proc_fdinfo_instantiate); | |
1953 | } | |
1954 | ||
1955 | static const struct file_operations proc_fdinfo_operations = { | |
1956 | .read = generic_read_dir, | |
1957 | .readdir = proc_readfdinfo, | |
1958 | }; | |
1959 | ||
1960 | /* | |
1961 | * proc directories can do almost nothing.. | |
1962 | */ | |
1963 | static const struct inode_operations proc_fdinfo_inode_operations = { | |
1964 | .lookup = proc_lookupfdinfo, | |
1965 | .setattr = proc_setattr, | |
1966 | }; | |
1967 | ||
1968 | ||
444ceed8 | 1969 | static struct dentry *proc_pident_instantiate(struct inode *dir, |
c5141e6d | 1970 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
444ceed8 | 1971 | { |
c5141e6d | 1972 | const struct pid_entry *p = ptr; |
444ceed8 EB |
1973 | struct inode *inode; |
1974 | struct proc_inode *ei; | |
1975 | struct dentry *error = ERR_PTR(-EINVAL); | |
1976 | ||
61a28784 | 1977 | inode = proc_pid_make_inode(dir->i_sb, task); |
444ceed8 EB |
1978 | if (!inode) |
1979 | goto out; | |
1980 | ||
1981 | ei = PROC_I(inode); | |
1982 | inode->i_mode = p->mode; | |
1983 | if (S_ISDIR(inode->i_mode)) | |
1984 | inode->i_nlink = 2; /* Use getattr to fix if necessary */ | |
1985 | if (p->iop) | |
1986 | inode->i_op = p->iop; | |
1987 | if (p->fop) | |
1988 | inode->i_fop = p->fop; | |
1989 | ei->op = p->op; | |
1990 | dentry->d_op = &pid_dentry_operations; | |
1991 | d_add(dentry, inode); | |
1992 | /* Close the race of the process dying before we return the dentry */ | |
1993 | if (pid_revalidate(dentry, NULL)) | |
1994 | error = NULL; | |
1995 | out: | |
1996 | return error; | |
1997 | } | |
1998 | ||
1da177e4 LT |
1999 | static struct dentry *proc_pident_lookup(struct inode *dir, |
2000 | struct dentry *dentry, | |
c5141e6d | 2001 | const struct pid_entry *ents, |
7bcd6b0e | 2002 | unsigned int nents) |
1da177e4 | 2003 | { |
cd6a3ce9 | 2004 | struct dentry *error; |
99f89551 | 2005 | struct task_struct *task = get_proc_task(dir); |
c5141e6d | 2006 | const struct pid_entry *p, *last; |
1da177e4 | 2007 | |
cd6a3ce9 | 2008 | error = ERR_PTR(-ENOENT); |
1da177e4 | 2009 | |
99f89551 EB |
2010 | if (!task) |
2011 | goto out_no_task; | |
1da177e4 | 2012 | |
20cdc894 EB |
2013 | /* |
2014 | * Yes, it does not scale. And it should not. Don't add | |
2015 | * new entries into /proc/<tgid>/ without very good reasons. | |
2016 | */ | |
7bcd6b0e EB |
2017 | last = &ents[nents - 1]; |
2018 | for (p = ents; p <= last; p++) { | |
1da177e4 LT |
2019 | if (p->len != dentry->d_name.len) |
2020 | continue; | |
2021 | if (!memcmp(dentry->d_name.name, p->name, p->len)) | |
2022 | break; | |
2023 | } | |
7bcd6b0e | 2024 | if (p > last) |
1da177e4 LT |
2025 | goto out; |
2026 | ||
444ceed8 | 2027 | error = proc_pident_instantiate(dir, dentry, task, p); |
1da177e4 | 2028 | out: |
99f89551 EB |
2029 | put_task_struct(task); |
2030 | out_no_task: | |
cd6a3ce9 | 2031 | return error; |
1da177e4 LT |
2032 | } |
2033 | ||
c5141e6d ED |
2034 | static int proc_pident_fill_cache(struct file *filp, void *dirent, |
2035 | filldir_t filldir, struct task_struct *task, const struct pid_entry *p) | |
61a28784 EB |
2036 | { |
2037 | return proc_fill_cache(filp, dirent, filldir, p->name, p->len, | |
2038 | proc_pident_instantiate, task, p); | |
2039 | } | |
2040 | ||
28a6d671 EB |
2041 | static int proc_pident_readdir(struct file *filp, |
2042 | void *dirent, filldir_t filldir, | |
c5141e6d | 2043 | const struct pid_entry *ents, unsigned int nents) |
28a6d671 EB |
2044 | { |
2045 | int i; | |
2fddfeef | 2046 | struct dentry *dentry = filp->f_path.dentry; |
28a6d671 EB |
2047 | struct inode *inode = dentry->d_inode; |
2048 | struct task_struct *task = get_proc_task(inode); | |
c5141e6d | 2049 | const struct pid_entry *p, *last; |
28a6d671 EB |
2050 | ino_t ino; |
2051 | int ret; | |
2052 | ||
2053 | ret = -ENOENT; | |
2054 | if (!task) | |
61a28784 | 2055 | goto out_no_task; |
28a6d671 EB |
2056 | |
2057 | ret = 0; | |
28a6d671 EB |
2058 | i = filp->f_pos; |
2059 | switch (i) { | |
2060 | case 0: | |
2061 | ino = inode->i_ino; | |
2062 | if (filldir(dirent, ".", 1, i, ino, DT_DIR) < 0) | |
2063 | goto out; | |
2064 | i++; | |
2065 | filp->f_pos++; | |
2066 | /* fall through */ | |
2067 | case 1: | |
2068 | ino = parent_ino(dentry); | |
2069 | if (filldir(dirent, "..", 2, i, ino, DT_DIR) < 0) | |
2070 | goto out; | |
2071 | i++; | |
2072 | filp->f_pos++; | |
2073 | /* fall through */ | |
2074 | default: | |
2075 | i -= 2; | |
2076 | if (i >= nents) { | |
2077 | ret = 1; | |
2078 | goto out; | |
2079 | } | |
2080 | p = ents + i; | |
7bcd6b0e EB |
2081 | last = &ents[nents - 1]; |
2082 | while (p <= last) { | |
61a28784 | 2083 | if (proc_pident_fill_cache(filp, dirent, filldir, task, p) < 0) |
28a6d671 EB |
2084 | goto out; |
2085 | filp->f_pos++; | |
2086 | p++; | |
2087 | } | |
2088 | } | |
2089 | ||
2090 | ret = 1; | |
2091 | out: | |
61a28784 EB |
2092 | put_task_struct(task); |
2093 | out_no_task: | |
28a6d671 | 2094 | return ret; |
1da177e4 LT |
2095 | } |
2096 | ||
28a6d671 EB |
2097 | #ifdef CONFIG_SECURITY |
2098 | static ssize_t proc_pid_attr_read(struct file * file, char __user * buf, | |
2099 | size_t count, loff_t *ppos) | |
2100 | { | |
2fddfeef | 2101 | struct inode * inode = file->f_path.dentry->d_inode; |
04ff9708 | 2102 | char *p = NULL; |
28a6d671 EB |
2103 | ssize_t length; |
2104 | struct task_struct *task = get_proc_task(inode); | |
2105 | ||
28a6d671 | 2106 | if (!task) |
04ff9708 | 2107 | return -ESRCH; |
28a6d671 EB |
2108 | |
2109 | length = security_getprocattr(task, | |
2fddfeef | 2110 | (char*)file->f_path.dentry->d_name.name, |
04ff9708 | 2111 | &p); |
28a6d671 | 2112 | put_task_struct(task); |
04ff9708 AV |
2113 | if (length > 0) |
2114 | length = simple_read_from_buffer(buf, count, ppos, p, length); | |
2115 | kfree(p); | |
28a6d671 | 2116 | return length; |
1da177e4 LT |
2117 | } |
2118 | ||
28a6d671 EB |
2119 | static ssize_t proc_pid_attr_write(struct file * file, const char __user * buf, |
2120 | size_t count, loff_t *ppos) | |
2121 | { | |
2fddfeef | 2122 | struct inode * inode = file->f_path.dentry->d_inode; |
28a6d671 EB |
2123 | char *page; |
2124 | ssize_t length; | |
2125 | struct task_struct *task = get_proc_task(inode); | |
2126 | ||
2127 | length = -ESRCH; | |
2128 | if (!task) | |
2129 | goto out_no_task; | |
2130 | if (count > PAGE_SIZE) | |
2131 | count = PAGE_SIZE; | |
2132 | ||
2133 | /* No partial writes. */ | |
2134 | length = -EINVAL; | |
2135 | if (*ppos != 0) | |
2136 | goto out; | |
2137 | ||
2138 | length = -ENOMEM; | |
e12ba74d | 2139 | page = (char*)__get_free_page(GFP_TEMPORARY); |
28a6d671 EB |
2140 | if (!page) |
2141 | goto out; | |
2142 | ||
2143 | length = -EFAULT; | |
2144 | if (copy_from_user(page, buf, count)) | |
2145 | goto out_free; | |
2146 | ||
2147 | length = security_setprocattr(task, | |
2fddfeef | 2148 | (char*)file->f_path.dentry->d_name.name, |
28a6d671 EB |
2149 | (void*)page, count); |
2150 | out_free: | |
2151 | free_page((unsigned long) page); | |
2152 | out: | |
2153 | put_task_struct(task); | |
2154 | out_no_task: | |
2155 | return length; | |
2156 | } | |
2157 | ||
00977a59 | 2158 | static const struct file_operations proc_pid_attr_operations = { |
28a6d671 EB |
2159 | .read = proc_pid_attr_read, |
2160 | .write = proc_pid_attr_write, | |
2161 | }; | |
2162 | ||
c5141e6d | 2163 | static const struct pid_entry attr_dir_stuff[] = { |
631f9c18 AD |
2164 | REG("current", S_IRUGO|S_IWUGO, proc_pid_attr_operations), |
2165 | REG("prev", S_IRUGO, proc_pid_attr_operations), | |
2166 | REG("exec", S_IRUGO|S_IWUGO, proc_pid_attr_operations), | |
2167 | REG("fscreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations), | |
2168 | REG("keycreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations), | |
2169 | REG("sockcreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations), | |
28a6d671 EB |
2170 | }; |
2171 | ||
72d9dcfc | 2172 | static int proc_attr_dir_readdir(struct file * filp, |
28a6d671 EB |
2173 | void * dirent, filldir_t filldir) |
2174 | { | |
2175 | return proc_pident_readdir(filp,dirent,filldir, | |
72d9dcfc | 2176 | attr_dir_stuff,ARRAY_SIZE(attr_dir_stuff)); |
28a6d671 EB |
2177 | } |
2178 | ||
00977a59 | 2179 | static const struct file_operations proc_attr_dir_operations = { |
1da177e4 | 2180 | .read = generic_read_dir, |
72d9dcfc | 2181 | .readdir = proc_attr_dir_readdir, |
1da177e4 LT |
2182 | }; |
2183 | ||
72d9dcfc | 2184 | static struct dentry *proc_attr_dir_lookup(struct inode *dir, |
28a6d671 EB |
2185 | struct dentry *dentry, struct nameidata *nd) |
2186 | { | |
7bcd6b0e EB |
2187 | return proc_pident_lookup(dir, dentry, |
2188 | attr_dir_stuff, ARRAY_SIZE(attr_dir_stuff)); | |
28a6d671 EB |
2189 | } |
2190 | ||
c5ef1c42 | 2191 | static const struct inode_operations proc_attr_dir_inode_operations = { |
72d9dcfc | 2192 | .lookup = proc_attr_dir_lookup, |
99f89551 | 2193 | .getattr = pid_getattr, |
6d76fa58 | 2194 | .setattr = proc_setattr, |
1da177e4 LT |
2195 | }; |
2196 | ||
28a6d671 EB |
2197 | #endif |
2198 | ||
3cb4a0bb KH |
2199 | #if defined(USE_ELF_CORE_DUMP) && defined(CONFIG_ELF_CORE) |
2200 | static ssize_t proc_coredump_filter_read(struct file *file, char __user *buf, | |
2201 | size_t count, loff_t *ppos) | |
2202 | { | |
2203 | struct task_struct *task = get_proc_task(file->f_dentry->d_inode); | |
2204 | struct mm_struct *mm; | |
2205 | char buffer[PROC_NUMBUF]; | |
2206 | size_t len; | |
2207 | int ret; | |
2208 | ||
2209 | if (!task) | |
2210 | return -ESRCH; | |
2211 | ||
2212 | ret = 0; | |
2213 | mm = get_task_mm(task); | |
2214 | if (mm) { | |
2215 | len = snprintf(buffer, sizeof(buffer), "%08lx\n", | |
2216 | ((mm->flags & MMF_DUMP_FILTER_MASK) >> | |
2217 | MMF_DUMP_FILTER_SHIFT)); | |
2218 | mmput(mm); | |
2219 | ret = simple_read_from_buffer(buf, count, ppos, buffer, len); | |
2220 | } | |
2221 | ||
2222 | put_task_struct(task); | |
2223 | ||
2224 | return ret; | |
2225 | } | |
2226 | ||
2227 | static ssize_t proc_coredump_filter_write(struct file *file, | |
2228 | const char __user *buf, | |
2229 | size_t count, | |
2230 | loff_t *ppos) | |
2231 | { | |
2232 | struct task_struct *task; | |
2233 | struct mm_struct *mm; | |
2234 | char buffer[PROC_NUMBUF], *end; | |
2235 | unsigned int val; | |
2236 | int ret; | |
2237 | int i; | |
2238 | unsigned long mask; | |
2239 | ||
2240 | ret = -EFAULT; | |
2241 | memset(buffer, 0, sizeof(buffer)); | |
2242 | if (count > sizeof(buffer) - 1) | |
2243 | count = sizeof(buffer) - 1; | |
2244 | if (copy_from_user(buffer, buf, count)) | |
2245 | goto out_no_task; | |
2246 | ||
2247 | ret = -EINVAL; | |
2248 | val = (unsigned int)simple_strtoul(buffer, &end, 0); | |
2249 | if (*end == '\n') | |
2250 | end++; | |
2251 | if (end - buffer == 0) | |
2252 | goto out_no_task; | |
2253 | ||
2254 | ret = -ESRCH; | |
2255 | task = get_proc_task(file->f_dentry->d_inode); | |
2256 | if (!task) | |
2257 | goto out_no_task; | |
2258 | ||
2259 | ret = end - buffer; | |
2260 | mm = get_task_mm(task); | |
2261 | if (!mm) | |
2262 | goto out_no_mm; | |
2263 | ||
2264 | for (i = 0, mask = 1; i < MMF_DUMP_FILTER_BITS; i++, mask <<= 1) { | |
2265 | if (val & mask) | |
2266 | set_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags); | |
2267 | else | |
2268 | clear_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags); | |
2269 | } | |
2270 | ||
2271 | mmput(mm); | |
2272 | out_no_mm: | |
2273 | put_task_struct(task); | |
2274 | out_no_task: | |
2275 | return ret; | |
2276 | } | |
2277 | ||
2278 | static const struct file_operations proc_coredump_filter_operations = { | |
2279 | .read = proc_coredump_filter_read, | |
2280 | .write = proc_coredump_filter_write, | |
2281 | }; | |
2282 | #endif | |
2283 | ||
28a6d671 EB |
2284 | /* |
2285 | * /proc/self: | |
2286 | */ | |
2287 | static int proc_self_readlink(struct dentry *dentry, char __user *buffer, | |
2288 | int buflen) | |
2289 | { | |
488e5bc4 | 2290 | struct pid_namespace *ns = dentry->d_sb->s_fs_info; |
b55fcb22 | 2291 | pid_t tgid = task_tgid_nr_ns(current, ns); |
28a6d671 | 2292 | char tmp[PROC_NUMBUF]; |
b55fcb22 | 2293 | if (!tgid) |
488e5bc4 | 2294 | return -ENOENT; |
b55fcb22 | 2295 | sprintf(tmp, "%d", tgid); |
28a6d671 EB |
2296 | return vfs_readlink(dentry,buffer,buflen,tmp); |
2297 | } | |
2298 | ||
2299 | static void *proc_self_follow_link(struct dentry *dentry, struct nameidata *nd) | |
2300 | { | |
488e5bc4 | 2301 | struct pid_namespace *ns = dentry->d_sb->s_fs_info; |
b55fcb22 | 2302 | pid_t tgid = task_tgid_nr_ns(current, ns); |
28a6d671 | 2303 | char tmp[PROC_NUMBUF]; |
b55fcb22 | 2304 | if (!tgid) |
488e5bc4 | 2305 | return ERR_PTR(-ENOENT); |
b55fcb22 | 2306 | sprintf(tmp, "%d", task_tgid_nr_ns(current, ns)); |
28a6d671 EB |
2307 | return ERR_PTR(vfs_follow_link(nd,tmp)); |
2308 | } | |
2309 | ||
c5ef1c42 | 2310 | static const struct inode_operations proc_self_inode_operations = { |
28a6d671 EB |
2311 | .readlink = proc_self_readlink, |
2312 | .follow_link = proc_self_follow_link, | |
2313 | }; | |
2314 | ||
801199ce EB |
2315 | /* |
2316 | * proc base | |
2317 | * | |
2318 | * These are the directory entries in the root directory of /proc | |
2319 | * that properly belong to the /proc filesystem, as they describe | |
2320 | * describe something that is process related. | |
2321 | */ | |
c5141e6d | 2322 | static const struct pid_entry proc_base_stuff[] = { |
61a28784 | 2323 | NOD("self", S_IFLNK|S_IRWXUGO, |
801199ce | 2324 | &proc_self_inode_operations, NULL, {}), |
801199ce EB |
2325 | }; |
2326 | ||
2327 | /* | |
2328 | * Exceptional case: normally we are not allowed to unhash a busy | |
2329 | * directory. In this case, however, we can do it - no aliasing problems | |
2330 | * due to the way we treat inodes. | |
2331 | */ | |
2332 | static int proc_base_revalidate(struct dentry *dentry, struct nameidata *nd) | |
2333 | { | |
2334 | struct inode *inode = dentry->d_inode; | |
2335 | struct task_struct *task = get_proc_task(inode); | |
2336 | if (task) { | |
2337 | put_task_struct(task); | |
2338 | return 1; | |
2339 | } | |
2340 | d_drop(dentry); | |
2341 | return 0; | |
2342 | } | |
2343 | ||
2344 | static struct dentry_operations proc_base_dentry_operations = | |
2345 | { | |
2346 | .d_revalidate = proc_base_revalidate, | |
2347 | .d_delete = pid_delete_dentry, | |
2348 | }; | |
2349 | ||
444ceed8 | 2350 | static struct dentry *proc_base_instantiate(struct inode *dir, |
c5141e6d | 2351 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
801199ce | 2352 | { |
c5141e6d | 2353 | const struct pid_entry *p = ptr; |
801199ce | 2354 | struct inode *inode; |
801199ce | 2355 | struct proc_inode *ei; |
444ceed8 | 2356 | struct dentry *error = ERR_PTR(-EINVAL); |
801199ce EB |
2357 | |
2358 | /* Allocate the inode */ | |
2359 | error = ERR_PTR(-ENOMEM); | |
2360 | inode = new_inode(dir->i_sb); | |
2361 | if (!inode) | |
2362 | goto out; | |
2363 | ||
2364 | /* Initialize the inode */ | |
2365 | ei = PROC_I(inode); | |
2366 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; | |
801199ce EB |
2367 | |
2368 | /* | |
2369 | * grab the reference to the task. | |
2370 | */ | |
1a657f78 | 2371 | ei->pid = get_task_pid(task, PIDTYPE_PID); |
801199ce EB |
2372 | if (!ei->pid) |
2373 | goto out_iput; | |
2374 | ||
2375 | inode->i_uid = 0; | |
2376 | inode->i_gid = 0; | |
2377 | inode->i_mode = p->mode; | |
2378 | if (S_ISDIR(inode->i_mode)) | |
2379 | inode->i_nlink = 2; | |
2380 | if (S_ISLNK(inode->i_mode)) | |
2381 | inode->i_size = 64; | |
2382 | if (p->iop) | |
2383 | inode->i_op = p->iop; | |
2384 | if (p->fop) | |
2385 | inode->i_fop = p->fop; | |
2386 | ei->op = p->op; | |
2387 | dentry->d_op = &proc_base_dentry_operations; | |
2388 | d_add(dentry, inode); | |
2389 | error = NULL; | |
2390 | out: | |
801199ce EB |
2391 | return error; |
2392 | out_iput: | |
2393 | iput(inode); | |
2394 | goto out; | |
2395 | } | |
2396 | ||
444ceed8 EB |
2397 | static struct dentry *proc_base_lookup(struct inode *dir, struct dentry *dentry) |
2398 | { | |
2399 | struct dentry *error; | |
2400 | struct task_struct *task = get_proc_task(dir); | |
c5141e6d | 2401 | const struct pid_entry *p, *last; |
444ceed8 EB |
2402 | |
2403 | error = ERR_PTR(-ENOENT); | |
2404 | ||
2405 | if (!task) | |
2406 | goto out_no_task; | |
2407 | ||
2408 | /* Lookup the directory entry */ | |
7bcd6b0e EB |
2409 | last = &proc_base_stuff[ARRAY_SIZE(proc_base_stuff) - 1]; |
2410 | for (p = proc_base_stuff; p <= last; p++) { | |
444ceed8 EB |
2411 | if (p->len != dentry->d_name.len) |
2412 | continue; | |
2413 | if (!memcmp(dentry->d_name.name, p->name, p->len)) | |
2414 | break; | |
2415 | } | |
7bcd6b0e | 2416 | if (p > last) |
444ceed8 EB |
2417 | goto out; |
2418 | ||
2419 | error = proc_base_instantiate(dir, dentry, task, p); | |
2420 | ||
2421 | out: | |
2422 | put_task_struct(task); | |
2423 | out_no_task: | |
2424 | return error; | |
2425 | } | |
2426 | ||
c5141e6d ED |
2427 | static int proc_base_fill_cache(struct file *filp, void *dirent, |
2428 | filldir_t filldir, struct task_struct *task, const struct pid_entry *p) | |
61a28784 EB |
2429 | { |
2430 | return proc_fill_cache(filp, dirent, filldir, p->name, p->len, | |
2431 | proc_base_instantiate, task, p); | |
2432 | } | |
2433 | ||
aba76fdb | 2434 | #ifdef CONFIG_TASK_IO_ACCOUNTING |
297c5d92 AR |
2435 | static int do_io_accounting(struct task_struct *task, char *buffer, int whole) |
2436 | { | |
940389b8 | 2437 | struct task_io_accounting acct = task->ioac; |
5995477a AR |
2438 | unsigned long flags; |
2439 | ||
2440 | if (whole && lock_task_sighand(task, &flags)) { | |
2441 | struct task_struct *t = task; | |
2442 | ||
2443 | task_io_accounting_add(&acct, &task->signal->ioac); | |
2444 | while_each_thread(task, t) | |
2445 | task_io_accounting_add(&acct, &t->ioac); | |
2446 | ||
2447 | unlock_task_sighand(task, &flags); | |
297c5d92 | 2448 | } |
aba76fdb AM |
2449 | return sprintf(buffer, |
2450 | "rchar: %llu\n" | |
2451 | "wchar: %llu\n" | |
2452 | "syscr: %llu\n" | |
2453 | "syscw: %llu\n" | |
2454 | "read_bytes: %llu\n" | |
2455 | "write_bytes: %llu\n" | |
2456 | "cancelled_write_bytes: %llu\n", | |
7c44319d AB |
2457 | (unsigned long long)acct.rchar, |
2458 | (unsigned long long)acct.wchar, | |
2459 | (unsigned long long)acct.syscr, | |
2460 | (unsigned long long)acct.syscw, | |
2461 | (unsigned long long)acct.read_bytes, | |
2462 | (unsigned long long)acct.write_bytes, | |
2463 | (unsigned long long)acct.cancelled_write_bytes); | |
297c5d92 AR |
2464 | } |
2465 | ||
2466 | static int proc_tid_io_accounting(struct task_struct *task, char *buffer) | |
2467 | { | |
2468 | return do_io_accounting(task, buffer, 0); | |
aba76fdb | 2469 | } |
297c5d92 AR |
2470 | |
2471 | static int proc_tgid_io_accounting(struct task_struct *task, char *buffer) | |
2472 | { | |
2473 | return do_io_accounting(task, buffer, 1); | |
2474 | } | |
2475 | #endif /* CONFIG_TASK_IO_ACCOUNTING */ | |
aba76fdb | 2476 | |
47830723 KC |
2477 | static int proc_pid_personality(struct seq_file *m, struct pid_namespace *ns, |
2478 | struct pid *pid, struct task_struct *task) | |
2479 | { | |
2480 | seq_printf(m, "%08x\n", task->personality); | |
2481 | return 0; | |
2482 | } | |
2483 | ||
28a6d671 EB |
2484 | /* |
2485 | * Thread groups | |
2486 | */ | |
00977a59 | 2487 | static const struct file_operations proc_task_operations; |
c5ef1c42 | 2488 | static const struct inode_operations proc_task_inode_operations; |
20cdc894 | 2489 | |
c5141e6d | 2490 | static const struct pid_entry tgid_base_stuff[] = { |
631f9c18 AD |
2491 | DIR("task", S_IRUGO|S_IXUGO, proc_task_inode_operations, proc_task_operations), |
2492 | DIR("fd", S_IRUSR|S_IXUSR, proc_fd_inode_operations, proc_fd_operations), | |
2493 | DIR("fdinfo", S_IRUSR|S_IXUSR, proc_fdinfo_inode_operations, proc_fdinfo_operations), | |
b2211a36 | 2494 | #ifdef CONFIG_NET |
631f9c18 | 2495 | DIR("net", S_IRUGO|S_IXUGO, proc_net_inode_operations, proc_net_operations), |
b2211a36 | 2496 | #endif |
631f9c18 AD |
2497 | REG("environ", S_IRUSR, proc_environ_operations), |
2498 | INF("auxv", S_IRUSR, proc_pid_auxv), | |
2499 | ONE("status", S_IRUGO, proc_pid_status), | |
2500 | ONE("personality", S_IRUSR, proc_pid_personality), | |
2501 | INF("limits", S_IRUSR, proc_pid_limits), | |
43ae34cb | 2502 | #ifdef CONFIG_SCHED_DEBUG |
631f9c18 | 2503 | REG("sched", S_IRUGO|S_IWUSR, proc_pid_sched_operations), |
ebcb6734 RM |
2504 | #endif |
2505 | #ifdef CONFIG_HAVE_ARCH_TRACEHOOK | |
631f9c18 | 2506 | INF("syscall", S_IRUSR, proc_pid_syscall), |
43ae34cb | 2507 | #endif |
631f9c18 AD |
2508 | INF("cmdline", S_IRUGO, proc_pid_cmdline), |
2509 | ONE("stat", S_IRUGO, proc_tgid_stat), | |
2510 | ONE("statm", S_IRUGO, proc_pid_statm), | |
2511 | REG("maps", S_IRUGO, proc_maps_operations), | |
28a6d671 | 2512 | #ifdef CONFIG_NUMA |
631f9c18 | 2513 | REG("numa_maps", S_IRUGO, proc_numa_maps_operations), |
28a6d671 | 2514 | #endif |
631f9c18 AD |
2515 | REG("mem", S_IRUSR|S_IWUSR, proc_mem_operations), |
2516 | LNK("cwd", proc_cwd_link), | |
2517 | LNK("root", proc_root_link), | |
2518 | LNK("exe", proc_exe_link), | |
2519 | REG("mounts", S_IRUGO, proc_mounts_operations), | |
2520 | REG("mountinfo", S_IRUGO, proc_mountinfo_operations), | |
2521 | REG("mountstats", S_IRUSR, proc_mountstats_operations), | |
1e883281 | 2522 | #ifdef CONFIG_PROC_PAGE_MONITOR |
631f9c18 AD |
2523 | REG("clear_refs", S_IWUSR, proc_clear_refs_operations), |
2524 | REG("smaps", S_IRUGO, proc_smaps_operations), | |
2525 | REG("pagemap", S_IRUSR, proc_pagemap_operations), | |
28a6d671 EB |
2526 | #endif |
2527 | #ifdef CONFIG_SECURITY | |
631f9c18 | 2528 | DIR("attr", S_IRUGO|S_IXUGO, proc_attr_dir_inode_operations, proc_attr_dir_operations), |
28a6d671 EB |
2529 | #endif |
2530 | #ifdef CONFIG_KALLSYMS | |
631f9c18 | 2531 | INF("wchan", S_IRUGO, proc_pid_wchan), |
28a6d671 | 2532 | #endif |
2ec220e2 KC |
2533 | #ifdef CONFIG_STACKTRACE |
2534 | ONE("stack", S_IRUSR, proc_pid_stack), | |
2535 | #endif | |
28a6d671 | 2536 | #ifdef CONFIG_SCHEDSTATS |
631f9c18 | 2537 | INF("schedstat", S_IRUGO, proc_pid_schedstat), |
28a6d671 | 2538 | #endif |
9745512c | 2539 | #ifdef CONFIG_LATENCYTOP |
631f9c18 | 2540 | REG("latency", S_IRUGO, proc_lstats_operations), |
9745512c | 2541 | #endif |
8793d854 | 2542 | #ifdef CONFIG_PROC_PID_CPUSET |
631f9c18 | 2543 | REG("cpuset", S_IRUGO, proc_cpuset_operations), |
a424316c PM |
2544 | #endif |
2545 | #ifdef CONFIG_CGROUPS | |
631f9c18 | 2546 | REG("cgroup", S_IRUGO, proc_cgroup_operations), |
28a6d671 | 2547 | #endif |
631f9c18 AD |
2548 | INF("oom_score", S_IRUGO, proc_oom_score), |
2549 | REG("oom_adj", S_IRUGO|S_IWUSR, proc_oom_adjust_operations), | |
28a6d671 | 2550 | #ifdef CONFIG_AUDITSYSCALL |
631f9c18 AD |
2551 | REG("loginuid", S_IWUSR|S_IRUGO, proc_loginuid_operations), |
2552 | REG("sessionid", S_IRUGO, proc_sessionid_operations), | |
28a6d671 | 2553 | #endif |
f4f154fd | 2554 | #ifdef CONFIG_FAULT_INJECTION |
631f9c18 | 2555 | REG("make-it-fail", S_IRUGO|S_IWUSR, proc_fault_inject_operations), |
f4f154fd | 2556 | #endif |
3cb4a0bb | 2557 | #if defined(USE_ELF_CORE_DUMP) && defined(CONFIG_ELF_CORE) |
631f9c18 | 2558 | REG("coredump_filter", S_IRUGO|S_IWUSR, proc_coredump_filter_operations), |
3cb4a0bb | 2559 | #endif |
aba76fdb | 2560 | #ifdef CONFIG_TASK_IO_ACCOUNTING |
631f9c18 | 2561 | INF("io", S_IRUGO, proc_tgid_io_accounting), |
aba76fdb | 2562 | #endif |
28a6d671 | 2563 | }; |
1da177e4 | 2564 | |
28a6d671 | 2565 | static int proc_tgid_base_readdir(struct file * filp, |
1da177e4 LT |
2566 | void * dirent, filldir_t filldir) |
2567 | { | |
2568 | return proc_pident_readdir(filp,dirent,filldir, | |
28a6d671 | 2569 | tgid_base_stuff,ARRAY_SIZE(tgid_base_stuff)); |
1da177e4 LT |
2570 | } |
2571 | ||
00977a59 | 2572 | static const struct file_operations proc_tgid_base_operations = { |
1da177e4 | 2573 | .read = generic_read_dir, |
28a6d671 | 2574 | .readdir = proc_tgid_base_readdir, |
1da177e4 LT |
2575 | }; |
2576 | ||
28a6d671 | 2577 | static struct dentry *proc_tgid_base_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd){ |
7bcd6b0e EB |
2578 | return proc_pident_lookup(dir, dentry, |
2579 | tgid_base_stuff, ARRAY_SIZE(tgid_base_stuff)); | |
1da177e4 LT |
2580 | } |
2581 | ||
c5ef1c42 | 2582 | static const struct inode_operations proc_tgid_base_inode_operations = { |
28a6d671 | 2583 | .lookup = proc_tgid_base_lookup, |
99f89551 | 2584 | .getattr = pid_getattr, |
6d76fa58 | 2585 | .setattr = proc_setattr, |
1da177e4 | 2586 | }; |
1da177e4 | 2587 | |
60347f67 | 2588 | static void proc_flush_task_mnt(struct vfsmount *mnt, pid_t pid, pid_t tgid) |
1da177e4 | 2589 | { |
48e6484d | 2590 | struct dentry *dentry, *leader, *dir; |
8578cea7 | 2591 | char buf[PROC_NUMBUF]; |
48e6484d EB |
2592 | struct qstr name; |
2593 | ||
2594 | name.name = buf; | |
60347f67 PE |
2595 | name.len = snprintf(buf, sizeof(buf), "%d", pid); |
2596 | dentry = d_hash_and_lookup(mnt->mnt_root, &name); | |
48e6484d | 2597 | if (dentry) { |
7766755a AA |
2598 | if (!(current->flags & PF_EXITING)) |
2599 | shrink_dcache_parent(dentry); | |
48e6484d EB |
2600 | d_drop(dentry); |
2601 | dput(dentry); | |
2602 | } | |
1da177e4 | 2603 | |
60347f67 | 2604 | if (tgid == 0) |
48e6484d | 2605 | goto out; |
1da177e4 | 2606 | |
48e6484d | 2607 | name.name = buf; |
60347f67 PE |
2608 | name.len = snprintf(buf, sizeof(buf), "%d", tgid); |
2609 | leader = d_hash_and_lookup(mnt->mnt_root, &name); | |
48e6484d EB |
2610 | if (!leader) |
2611 | goto out; | |
1da177e4 | 2612 | |
48e6484d EB |
2613 | name.name = "task"; |
2614 | name.len = strlen(name.name); | |
2615 | dir = d_hash_and_lookup(leader, &name); | |
2616 | if (!dir) | |
2617 | goto out_put_leader; | |
2618 | ||
2619 | name.name = buf; | |
60347f67 | 2620 | name.len = snprintf(buf, sizeof(buf), "%d", pid); |
48e6484d EB |
2621 | dentry = d_hash_and_lookup(dir, &name); |
2622 | if (dentry) { | |
2623 | shrink_dcache_parent(dentry); | |
2624 | d_drop(dentry); | |
2625 | dput(dentry); | |
1da177e4 | 2626 | } |
48e6484d EB |
2627 | |
2628 | dput(dir); | |
2629 | out_put_leader: | |
2630 | dput(leader); | |
2631 | out: | |
2632 | return; | |
1da177e4 LT |
2633 | } |
2634 | ||
0895e91d RD |
2635 | /** |
2636 | * proc_flush_task - Remove dcache entries for @task from the /proc dcache. | |
2637 | * @task: task that should be flushed. | |
2638 | * | |
2639 | * When flushing dentries from proc, one needs to flush them from global | |
60347f67 | 2640 | * proc (proc_mnt) and from all the namespaces' procs this task was seen |
0895e91d RD |
2641 | * in. This call is supposed to do all of this job. |
2642 | * | |
2643 | * Looks in the dcache for | |
2644 | * /proc/@pid | |
2645 | * /proc/@tgid/task/@pid | |
2646 | * if either directory is present flushes it and all of it'ts children | |
2647 | * from the dcache. | |
2648 | * | |
2649 | * It is safe and reasonable to cache /proc entries for a task until | |
2650 | * that task exits. After that they just clog up the dcache with | |
2651 | * useless entries, possibly causing useful dcache entries to be | |
2652 | * flushed instead. This routine is proved to flush those useless | |
2653 | * dcache entries at process exit time. | |
2654 | * | |
2655 | * NOTE: This routine is just an optimization so it does not guarantee | |
2656 | * that no dcache entries will exist at process exit time it | |
2657 | * just makes it very unlikely that any will persist. | |
60347f67 PE |
2658 | */ |
2659 | ||
2660 | void proc_flush_task(struct task_struct *task) | |
2661 | { | |
9fcc2d15 EB |
2662 | int i; |
2663 | struct pid *pid, *tgid = NULL; | |
130f77ec PE |
2664 | struct upid *upid; |
2665 | ||
130f77ec | 2666 | pid = task_pid(task); |
9fcc2d15 EB |
2667 | if (thread_group_leader(task)) |
2668 | tgid = task_tgid(task); | |
130f77ec | 2669 | |
9fcc2d15 | 2670 | for (i = 0; i <= pid->level; i++) { |
130f77ec PE |
2671 | upid = &pid->numbers[i]; |
2672 | proc_flush_task_mnt(upid->ns->proc_mnt, upid->nr, | |
9fcc2d15 | 2673 | tgid ? tgid->numbers[i].nr : 0); |
130f77ec | 2674 | } |
6f4e6433 PE |
2675 | |
2676 | upid = &pid->numbers[pid->level]; | |
2677 | if (upid->nr == 1) | |
2678 | pid_ns_release_proc(upid->ns); | |
60347f67 PE |
2679 | } |
2680 | ||
9711ef99 AB |
2681 | static struct dentry *proc_pid_instantiate(struct inode *dir, |
2682 | struct dentry * dentry, | |
c5141e6d | 2683 | struct task_struct *task, const void *ptr) |
444ceed8 EB |
2684 | { |
2685 | struct dentry *error = ERR_PTR(-ENOENT); | |
2686 | struct inode *inode; | |
2687 | ||
61a28784 | 2688 | inode = proc_pid_make_inode(dir->i_sb, task); |
444ceed8 EB |
2689 | if (!inode) |
2690 | goto out; | |
2691 | ||
2692 | inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO; | |
2693 | inode->i_op = &proc_tgid_base_inode_operations; | |
2694 | inode->i_fop = &proc_tgid_base_operations; | |
2695 | inode->i_flags|=S_IMMUTABLE; | |
aed54175 VN |
2696 | |
2697 | inode->i_nlink = 2 + pid_entry_count_dirs(tgid_base_stuff, | |
2698 | ARRAY_SIZE(tgid_base_stuff)); | |
444ceed8 EB |
2699 | |
2700 | dentry->d_op = &pid_dentry_operations; | |
2701 | ||
2702 | d_add(dentry, inode); | |
2703 | /* Close the race of the process dying before we return the dentry */ | |
2704 | if (pid_revalidate(dentry, NULL)) | |
2705 | error = NULL; | |
2706 | out: | |
2707 | return error; | |
2708 | } | |
2709 | ||
1da177e4 LT |
2710 | struct dentry *proc_pid_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd) |
2711 | { | |
cd6a3ce9 | 2712 | struct dentry *result = ERR_PTR(-ENOENT); |
1da177e4 | 2713 | struct task_struct *task; |
1da177e4 | 2714 | unsigned tgid; |
b488893a | 2715 | struct pid_namespace *ns; |
1da177e4 | 2716 | |
801199ce EB |
2717 | result = proc_base_lookup(dir, dentry); |
2718 | if (!IS_ERR(result) || PTR_ERR(result) != -ENOENT) | |
2719 | goto out; | |
2720 | ||
1da177e4 LT |
2721 | tgid = name_to_int(dentry); |
2722 | if (tgid == ~0U) | |
2723 | goto out; | |
2724 | ||
b488893a | 2725 | ns = dentry->d_sb->s_fs_info; |
de758734 | 2726 | rcu_read_lock(); |
b488893a | 2727 | task = find_task_by_pid_ns(tgid, ns); |
1da177e4 LT |
2728 | if (task) |
2729 | get_task_struct(task); | |
de758734 | 2730 | rcu_read_unlock(); |
1da177e4 LT |
2731 | if (!task) |
2732 | goto out; | |
2733 | ||
444ceed8 | 2734 | result = proc_pid_instantiate(dir, dentry, task, NULL); |
1da177e4 | 2735 | put_task_struct(task); |
1da177e4 | 2736 | out: |
cd6a3ce9 | 2737 | return result; |
1da177e4 LT |
2738 | } |
2739 | ||
1da177e4 | 2740 | /* |
0804ef4b | 2741 | * Find the first task with tgid >= tgid |
0bc58a91 | 2742 | * |
1da177e4 | 2743 | */ |
19fd4bb2 EB |
2744 | struct tgid_iter { |
2745 | unsigned int tgid; | |
0804ef4b | 2746 | struct task_struct *task; |
19fd4bb2 EB |
2747 | }; |
2748 | static struct tgid_iter next_tgid(struct pid_namespace *ns, struct tgid_iter iter) | |
2749 | { | |
0804ef4b | 2750 | struct pid *pid; |
1da177e4 | 2751 | |
19fd4bb2 EB |
2752 | if (iter.task) |
2753 | put_task_struct(iter.task); | |
454cc105 | 2754 | rcu_read_lock(); |
0804ef4b | 2755 | retry: |
19fd4bb2 EB |
2756 | iter.task = NULL; |
2757 | pid = find_ge_pid(iter.tgid, ns); | |
0804ef4b | 2758 | if (pid) { |
19fd4bb2 EB |
2759 | iter.tgid = pid_nr_ns(pid, ns); |
2760 | iter.task = pid_task(pid, PIDTYPE_PID); | |
0804ef4b EB |
2761 | /* What we to know is if the pid we have find is the |
2762 | * pid of a thread_group_leader. Testing for task | |
2763 | * being a thread_group_leader is the obvious thing | |
2764 | * todo but there is a window when it fails, due to | |
2765 | * the pid transfer logic in de_thread. | |
2766 | * | |
2767 | * So we perform the straight forward test of seeing | |
2768 | * if the pid we have found is the pid of a thread | |
2769 | * group leader, and don't worry if the task we have | |
2770 | * found doesn't happen to be a thread group leader. | |
2771 | * As we don't care in the case of readdir. | |
2772 | */ | |
19fd4bb2 EB |
2773 | if (!iter.task || !has_group_leader_pid(iter.task)) { |
2774 | iter.tgid += 1; | |
0804ef4b | 2775 | goto retry; |
19fd4bb2 EB |
2776 | } |
2777 | get_task_struct(iter.task); | |
0bc58a91 | 2778 | } |
454cc105 | 2779 | rcu_read_unlock(); |
19fd4bb2 | 2780 | return iter; |
1da177e4 LT |
2781 | } |
2782 | ||
7bcd6b0e | 2783 | #define TGID_OFFSET (FIRST_PROCESS_ENTRY + ARRAY_SIZE(proc_base_stuff)) |
0804ef4b | 2784 | |
61a28784 | 2785 | static int proc_pid_fill_cache(struct file *filp, void *dirent, filldir_t filldir, |
19fd4bb2 | 2786 | struct tgid_iter iter) |
61a28784 EB |
2787 | { |
2788 | char name[PROC_NUMBUF]; | |
19fd4bb2 | 2789 | int len = snprintf(name, sizeof(name), "%d", iter.tgid); |
61a28784 | 2790 | return proc_fill_cache(filp, dirent, filldir, name, len, |
19fd4bb2 | 2791 | proc_pid_instantiate, iter.task, NULL); |
61a28784 EB |
2792 | } |
2793 | ||
1da177e4 LT |
2794 | /* for the /proc/ directory itself, after non-process stuff has been done */ |
2795 | int proc_pid_readdir(struct file * filp, void * dirent, filldir_t filldir) | |
2796 | { | |
1da177e4 | 2797 | unsigned int nr = filp->f_pos - FIRST_PROCESS_ENTRY; |
2fddfeef | 2798 | struct task_struct *reaper = get_proc_task(filp->f_path.dentry->d_inode); |
19fd4bb2 | 2799 | struct tgid_iter iter; |
b488893a | 2800 | struct pid_namespace *ns; |
1da177e4 | 2801 | |
61a28784 EB |
2802 | if (!reaper) |
2803 | goto out_no_task; | |
2804 | ||
7bcd6b0e | 2805 | for (; nr < ARRAY_SIZE(proc_base_stuff); filp->f_pos++, nr++) { |
c5141e6d | 2806 | const struct pid_entry *p = &proc_base_stuff[nr]; |
61a28784 | 2807 | if (proc_base_fill_cache(filp, dirent, filldir, reaper, p) < 0) |
801199ce | 2808 | goto out; |
1da177e4 LT |
2809 | } |
2810 | ||
b488893a | 2811 | ns = filp->f_dentry->d_sb->s_fs_info; |
19fd4bb2 EB |
2812 | iter.task = NULL; |
2813 | iter.tgid = filp->f_pos - TGID_OFFSET; | |
2814 | for (iter = next_tgid(ns, iter); | |
2815 | iter.task; | |
2816 | iter.tgid += 1, iter = next_tgid(ns, iter)) { | |
2817 | filp->f_pos = iter.tgid + TGID_OFFSET; | |
2818 | if (proc_pid_fill_cache(filp, dirent, filldir, iter) < 0) { | |
2819 | put_task_struct(iter.task); | |
0804ef4b | 2820 | goto out; |
1da177e4 | 2821 | } |
0bc58a91 | 2822 | } |
0804ef4b EB |
2823 | filp->f_pos = PID_MAX_LIMIT + TGID_OFFSET; |
2824 | out: | |
61a28784 EB |
2825 | put_task_struct(reaper); |
2826 | out_no_task: | |
0bc58a91 EB |
2827 | return 0; |
2828 | } | |
1da177e4 | 2829 | |
28a6d671 EB |
2830 | /* |
2831 | * Tasks | |
2832 | */ | |
c5141e6d | 2833 | static const struct pid_entry tid_base_stuff[] = { |
631f9c18 AD |
2834 | DIR("fd", S_IRUSR|S_IXUSR, proc_fd_inode_operations, proc_fd_operations), |
2835 | DIR("fdinfo", S_IRUSR|S_IXUSR, proc_fdinfo_inode_operations, proc_fd_operations), | |
2836 | REG("environ", S_IRUSR, proc_environ_operations), | |
2837 | INF("auxv", S_IRUSR, proc_pid_auxv), | |
2838 | ONE("status", S_IRUGO, proc_pid_status), | |
2839 | ONE("personality", S_IRUSR, proc_pid_personality), | |
2840 | INF("limits", S_IRUSR, proc_pid_limits), | |
43ae34cb | 2841 | #ifdef CONFIG_SCHED_DEBUG |
631f9c18 | 2842 | REG("sched", S_IRUGO|S_IWUSR, proc_pid_sched_operations), |
ebcb6734 RM |
2843 | #endif |
2844 | #ifdef CONFIG_HAVE_ARCH_TRACEHOOK | |
631f9c18 | 2845 | INF("syscall", S_IRUSR, proc_pid_syscall), |
43ae34cb | 2846 | #endif |
631f9c18 AD |
2847 | INF("cmdline", S_IRUGO, proc_pid_cmdline), |
2848 | ONE("stat", S_IRUGO, proc_tid_stat), | |
2849 | ONE("statm", S_IRUGO, proc_pid_statm), | |
2850 | REG("maps", S_IRUGO, proc_maps_operations), | |
28a6d671 | 2851 | #ifdef CONFIG_NUMA |
631f9c18 | 2852 | REG("numa_maps", S_IRUGO, proc_numa_maps_operations), |
28a6d671 | 2853 | #endif |
631f9c18 AD |
2854 | REG("mem", S_IRUSR|S_IWUSR, proc_mem_operations), |
2855 | LNK("cwd", proc_cwd_link), | |
2856 | LNK("root", proc_root_link), | |
2857 | LNK("exe", proc_exe_link), | |
2858 | REG("mounts", S_IRUGO, proc_mounts_operations), | |
2859 | REG("mountinfo", S_IRUGO, proc_mountinfo_operations), | |
1e883281 | 2860 | #ifdef CONFIG_PROC_PAGE_MONITOR |
631f9c18 AD |
2861 | REG("clear_refs", S_IWUSR, proc_clear_refs_operations), |
2862 | REG("smaps", S_IRUGO, proc_smaps_operations), | |
2863 | REG("pagemap", S_IRUSR, proc_pagemap_operations), | |
28a6d671 EB |
2864 | #endif |
2865 | #ifdef CONFIG_SECURITY | |
631f9c18 | 2866 | DIR("attr", S_IRUGO|S_IXUGO, proc_attr_dir_inode_operations, proc_attr_dir_operations), |
28a6d671 EB |
2867 | #endif |
2868 | #ifdef CONFIG_KALLSYMS | |
631f9c18 | 2869 | INF("wchan", S_IRUGO, proc_pid_wchan), |
28a6d671 | 2870 | #endif |
2ec220e2 KC |
2871 | #ifdef CONFIG_STACKTRACE |
2872 | ONE("stack", S_IRUSR, proc_pid_stack), | |
2873 | #endif | |
28a6d671 | 2874 | #ifdef CONFIG_SCHEDSTATS |
631f9c18 | 2875 | INF("schedstat", S_IRUGO, proc_pid_schedstat), |
28a6d671 | 2876 | #endif |
9745512c | 2877 | #ifdef CONFIG_LATENCYTOP |
631f9c18 | 2878 | REG("latency", S_IRUGO, proc_lstats_operations), |
9745512c | 2879 | #endif |
8793d854 | 2880 | #ifdef CONFIG_PROC_PID_CPUSET |
631f9c18 | 2881 | REG("cpuset", S_IRUGO, proc_cpuset_operations), |
a424316c PM |
2882 | #endif |
2883 | #ifdef CONFIG_CGROUPS | |
631f9c18 | 2884 | REG("cgroup", S_IRUGO, proc_cgroup_operations), |
28a6d671 | 2885 | #endif |
631f9c18 AD |
2886 | INF("oom_score", S_IRUGO, proc_oom_score), |
2887 | REG("oom_adj", S_IRUGO|S_IWUSR, proc_oom_adjust_operations), | |
28a6d671 | 2888 | #ifdef CONFIG_AUDITSYSCALL |
631f9c18 AD |
2889 | REG("loginuid", S_IWUSR|S_IRUGO, proc_loginuid_operations), |
2890 | REG("sessionid", S_IRUSR, proc_sessionid_operations), | |
28a6d671 | 2891 | #endif |
f4f154fd | 2892 | #ifdef CONFIG_FAULT_INJECTION |
631f9c18 | 2893 | REG("make-it-fail", S_IRUGO|S_IWUSR, proc_fault_inject_operations), |
f4f154fd | 2894 | #endif |
297c5d92 | 2895 | #ifdef CONFIG_TASK_IO_ACCOUNTING |
631f9c18 | 2896 | INF("io", S_IRUGO, proc_tid_io_accounting), |
297c5d92 | 2897 | #endif |
28a6d671 EB |
2898 | }; |
2899 | ||
2900 | static int proc_tid_base_readdir(struct file * filp, | |
2901 | void * dirent, filldir_t filldir) | |
2902 | { | |
2903 | return proc_pident_readdir(filp,dirent,filldir, | |
2904 | tid_base_stuff,ARRAY_SIZE(tid_base_stuff)); | |
2905 | } | |
2906 | ||
2907 | static struct dentry *proc_tid_base_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd){ | |
7bcd6b0e EB |
2908 | return proc_pident_lookup(dir, dentry, |
2909 | tid_base_stuff, ARRAY_SIZE(tid_base_stuff)); | |
28a6d671 EB |
2910 | } |
2911 | ||
00977a59 | 2912 | static const struct file_operations proc_tid_base_operations = { |
28a6d671 EB |
2913 | .read = generic_read_dir, |
2914 | .readdir = proc_tid_base_readdir, | |
2915 | }; | |
2916 | ||
c5ef1c42 | 2917 | static const struct inode_operations proc_tid_base_inode_operations = { |
28a6d671 EB |
2918 | .lookup = proc_tid_base_lookup, |
2919 | .getattr = pid_getattr, | |
2920 | .setattr = proc_setattr, | |
2921 | }; | |
2922 | ||
444ceed8 | 2923 | static struct dentry *proc_task_instantiate(struct inode *dir, |
c5141e6d | 2924 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
444ceed8 EB |
2925 | { |
2926 | struct dentry *error = ERR_PTR(-ENOENT); | |
2927 | struct inode *inode; | |
61a28784 | 2928 | inode = proc_pid_make_inode(dir->i_sb, task); |
444ceed8 EB |
2929 | |
2930 | if (!inode) | |
2931 | goto out; | |
2932 | inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO; | |
2933 | inode->i_op = &proc_tid_base_inode_operations; | |
2934 | inode->i_fop = &proc_tid_base_operations; | |
2935 | inode->i_flags|=S_IMMUTABLE; | |
aed54175 VN |
2936 | |
2937 | inode->i_nlink = 2 + pid_entry_count_dirs(tid_base_stuff, | |
2938 | ARRAY_SIZE(tid_base_stuff)); | |
444ceed8 EB |
2939 | |
2940 | dentry->d_op = &pid_dentry_operations; | |
2941 | ||
2942 | d_add(dentry, inode); | |
2943 | /* Close the race of the process dying before we return the dentry */ | |
2944 | if (pid_revalidate(dentry, NULL)) | |
2945 | error = NULL; | |
2946 | out: | |
2947 | return error; | |
2948 | } | |
2949 | ||
28a6d671 EB |
2950 | static struct dentry *proc_task_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd) |
2951 | { | |
2952 | struct dentry *result = ERR_PTR(-ENOENT); | |
2953 | struct task_struct *task; | |
2954 | struct task_struct *leader = get_proc_task(dir); | |
28a6d671 | 2955 | unsigned tid; |
b488893a | 2956 | struct pid_namespace *ns; |
28a6d671 EB |
2957 | |
2958 | if (!leader) | |
2959 | goto out_no_task; | |
2960 | ||
2961 | tid = name_to_int(dentry); | |
2962 | if (tid == ~0U) | |
2963 | goto out; | |
2964 | ||
b488893a | 2965 | ns = dentry->d_sb->s_fs_info; |
28a6d671 | 2966 | rcu_read_lock(); |
b488893a | 2967 | task = find_task_by_pid_ns(tid, ns); |
28a6d671 EB |
2968 | if (task) |
2969 | get_task_struct(task); | |
2970 | rcu_read_unlock(); | |
2971 | if (!task) | |
2972 | goto out; | |
bac0abd6 | 2973 | if (!same_thread_group(leader, task)) |
28a6d671 EB |
2974 | goto out_drop_task; |
2975 | ||
444ceed8 | 2976 | result = proc_task_instantiate(dir, dentry, task, NULL); |
28a6d671 EB |
2977 | out_drop_task: |
2978 | put_task_struct(task); | |
2979 | out: | |
2980 | put_task_struct(leader); | |
2981 | out_no_task: | |
2982 | return result; | |
2983 | } | |
2984 | ||
0bc58a91 EB |
2985 | /* |
2986 | * Find the first tid of a thread group to return to user space. | |
2987 | * | |
2988 | * Usually this is just the thread group leader, but if the users | |
2989 | * buffer was too small or there was a seek into the middle of the | |
2990 | * directory we have more work todo. | |
2991 | * | |
2992 | * In the case of a short read we start with find_task_by_pid. | |
2993 | * | |
2994 | * In the case of a seek we start with the leader and walk nr | |
2995 | * threads past it. | |
2996 | */ | |
cc288738 | 2997 | static struct task_struct *first_tid(struct task_struct *leader, |
b488893a | 2998 | int tid, int nr, struct pid_namespace *ns) |
0bc58a91 | 2999 | { |
a872ff0c | 3000 | struct task_struct *pos; |
1da177e4 | 3001 | |
cc288738 | 3002 | rcu_read_lock(); |
0bc58a91 EB |
3003 | /* Attempt to start with the pid of a thread */ |
3004 | if (tid && (nr > 0)) { | |
b488893a | 3005 | pos = find_task_by_pid_ns(tid, ns); |
a872ff0c ON |
3006 | if (pos && (pos->group_leader == leader)) |
3007 | goto found; | |
0bc58a91 | 3008 | } |
1da177e4 | 3009 | |
0bc58a91 | 3010 | /* If nr exceeds the number of threads there is nothing todo */ |
a872ff0c ON |
3011 | pos = NULL; |
3012 | if (nr && nr >= get_nr_threads(leader)) | |
3013 | goto out; | |
1da177e4 | 3014 | |
a872ff0c ON |
3015 | /* If we haven't found our starting place yet start |
3016 | * with the leader and walk nr threads forward. | |
0bc58a91 | 3017 | */ |
a872ff0c ON |
3018 | for (pos = leader; nr > 0; --nr) { |
3019 | pos = next_thread(pos); | |
3020 | if (pos == leader) { | |
3021 | pos = NULL; | |
3022 | goto out; | |
3023 | } | |
1da177e4 | 3024 | } |
a872ff0c ON |
3025 | found: |
3026 | get_task_struct(pos); | |
3027 | out: | |
cc288738 | 3028 | rcu_read_unlock(); |
0bc58a91 EB |
3029 | return pos; |
3030 | } | |
3031 | ||
3032 | /* | |
3033 | * Find the next thread in the thread list. | |
3034 | * Return NULL if there is an error or no next thread. | |
3035 | * | |
3036 | * The reference to the input task_struct is released. | |
3037 | */ | |
3038 | static struct task_struct *next_tid(struct task_struct *start) | |
3039 | { | |
c1df7fb8 | 3040 | struct task_struct *pos = NULL; |
cc288738 | 3041 | rcu_read_lock(); |
c1df7fb8 | 3042 | if (pid_alive(start)) { |
0bc58a91 | 3043 | pos = next_thread(start); |
c1df7fb8 ON |
3044 | if (thread_group_leader(pos)) |
3045 | pos = NULL; | |
3046 | else | |
3047 | get_task_struct(pos); | |
3048 | } | |
cc288738 | 3049 | rcu_read_unlock(); |
0bc58a91 EB |
3050 | put_task_struct(start); |
3051 | return pos; | |
1da177e4 LT |
3052 | } |
3053 | ||
61a28784 EB |
3054 | static int proc_task_fill_cache(struct file *filp, void *dirent, filldir_t filldir, |
3055 | struct task_struct *task, int tid) | |
3056 | { | |
3057 | char name[PROC_NUMBUF]; | |
3058 | int len = snprintf(name, sizeof(name), "%d", tid); | |
3059 | return proc_fill_cache(filp, dirent, filldir, name, len, | |
3060 | proc_task_instantiate, task, NULL); | |
3061 | } | |
3062 | ||
1da177e4 LT |
3063 | /* for the /proc/TGID/task/ directories */ |
3064 | static int proc_task_readdir(struct file * filp, void * dirent, filldir_t filldir) | |
3065 | { | |
2fddfeef | 3066 | struct dentry *dentry = filp->f_path.dentry; |
1da177e4 | 3067 | struct inode *inode = dentry->d_inode; |
7d895244 | 3068 | struct task_struct *leader = NULL; |
0bc58a91 | 3069 | struct task_struct *task; |
1da177e4 LT |
3070 | int retval = -ENOENT; |
3071 | ino_t ino; | |
0bc58a91 | 3072 | int tid; |
1da177e4 | 3073 | unsigned long pos = filp->f_pos; /* avoiding "long long" filp->f_pos */ |
b488893a | 3074 | struct pid_namespace *ns; |
1da177e4 | 3075 | |
7d895244 GC |
3076 | task = get_proc_task(inode); |
3077 | if (!task) | |
3078 | goto out_no_task; | |
3079 | rcu_read_lock(); | |
3080 | if (pid_alive(task)) { | |
3081 | leader = task->group_leader; | |
3082 | get_task_struct(leader); | |
3083 | } | |
3084 | rcu_read_unlock(); | |
3085 | put_task_struct(task); | |
99f89551 EB |
3086 | if (!leader) |
3087 | goto out_no_task; | |
1da177e4 LT |
3088 | retval = 0; |
3089 | ||
3090 | switch (pos) { | |
3091 | case 0: | |
3092 | ino = inode->i_ino; | |
3093 | if (filldir(dirent, ".", 1, pos, ino, DT_DIR) < 0) | |
3094 | goto out; | |
3095 | pos++; | |
3096 | /* fall through */ | |
3097 | case 1: | |
3098 | ino = parent_ino(dentry); | |
3099 | if (filldir(dirent, "..", 2, pos, ino, DT_DIR) < 0) | |
3100 | goto out; | |
3101 | pos++; | |
3102 | /* fall through */ | |
3103 | } | |
3104 | ||
0bc58a91 EB |
3105 | /* f_version caches the tgid value that the last readdir call couldn't |
3106 | * return. lseek aka telldir automagically resets f_version to 0. | |
3107 | */ | |
b488893a | 3108 | ns = filp->f_dentry->d_sb->s_fs_info; |
2b47c361 | 3109 | tid = (int)filp->f_version; |
0bc58a91 | 3110 | filp->f_version = 0; |
b488893a | 3111 | for (task = first_tid(leader, tid, pos - 2, ns); |
0bc58a91 EB |
3112 | task; |
3113 | task = next_tid(task), pos++) { | |
b488893a | 3114 | tid = task_pid_nr_ns(task, ns); |
61a28784 | 3115 | if (proc_task_fill_cache(filp, dirent, filldir, task, tid) < 0) { |
0bc58a91 EB |
3116 | /* returning this tgid failed, save it as the first |
3117 | * pid for the next readir call */ | |
2b47c361 | 3118 | filp->f_version = (u64)tid; |
0bc58a91 | 3119 | put_task_struct(task); |
1da177e4 | 3120 | break; |
0bc58a91 | 3121 | } |
1da177e4 LT |
3122 | } |
3123 | out: | |
3124 | filp->f_pos = pos; | |
99f89551 EB |
3125 | put_task_struct(leader); |
3126 | out_no_task: | |
1da177e4 LT |
3127 | return retval; |
3128 | } | |
6e66b52b EB |
3129 | |
3130 | static int proc_task_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) | |
3131 | { | |
3132 | struct inode *inode = dentry->d_inode; | |
99f89551 | 3133 | struct task_struct *p = get_proc_task(inode); |
6e66b52b EB |
3134 | generic_fillattr(inode, stat); |
3135 | ||
99f89551 | 3136 | if (p) { |
99f89551 | 3137 | stat->nlink += get_nr_threads(p); |
99f89551 | 3138 | put_task_struct(p); |
6e66b52b EB |
3139 | } |
3140 | ||
3141 | return 0; | |
3142 | } | |
28a6d671 | 3143 | |
c5ef1c42 | 3144 | static const struct inode_operations proc_task_inode_operations = { |
28a6d671 EB |
3145 | .lookup = proc_task_lookup, |
3146 | .getattr = proc_task_getattr, | |
3147 | .setattr = proc_setattr, | |
3148 | }; | |
3149 | ||
00977a59 | 3150 | static const struct file_operations proc_task_operations = { |
28a6d671 EB |
3151 | .read = generic_read_dir, |
3152 | .readdir = proc_task_readdir, | |
3153 | }; |