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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> |
5ad4e53b | 83 | #include <linux/fs_struct.h> |
1da177e4 LT |
84 | #include "internal.h" |
85 | ||
0f2fe20f EB |
86 | /* NOTE: |
87 | * Implementing inode permission operations in /proc is almost | |
88 | * certainly an error. Permission checks need to happen during | |
89 | * each system call not at open time. The reason is that most of | |
90 | * what we wish to check for permissions in /proc varies at runtime. | |
91 | * | |
92 | * The classic example of a problem is opening file descriptors | |
93 | * in /proc for a task before it execs a suid executable. | |
94 | */ | |
95 | ||
1da177e4 | 96 | struct pid_entry { |
1da177e4 | 97 | char *name; |
c5141e6d | 98 | int len; |
1da177e4 | 99 | mode_t mode; |
c5ef1c42 | 100 | const struct inode_operations *iop; |
00977a59 | 101 | const struct file_operations *fop; |
20cdc894 | 102 | union proc_op op; |
1da177e4 LT |
103 | }; |
104 | ||
61a28784 | 105 | #define NOD(NAME, MODE, IOP, FOP, OP) { \ |
20cdc894 | 106 | .name = (NAME), \ |
c5141e6d | 107 | .len = sizeof(NAME) - 1, \ |
20cdc894 EB |
108 | .mode = MODE, \ |
109 | .iop = IOP, \ | |
110 | .fop = FOP, \ | |
111 | .op = OP, \ | |
112 | } | |
113 | ||
631f9c18 AD |
114 | #define DIR(NAME, MODE, iops, fops) \ |
115 | NOD(NAME, (S_IFDIR|(MODE)), &iops, &fops, {} ) | |
116 | #define LNK(NAME, get_link) \ | |
61a28784 | 117 | NOD(NAME, (S_IFLNK|S_IRWXUGO), \ |
20cdc894 | 118 | &proc_pid_link_inode_operations, NULL, \ |
631f9c18 AD |
119 | { .proc_get_link = get_link } ) |
120 | #define REG(NAME, MODE, fops) \ | |
121 | NOD(NAME, (S_IFREG|(MODE)), NULL, &fops, {}) | |
122 | #define INF(NAME, MODE, read) \ | |
61a28784 | 123 | NOD(NAME, (S_IFREG|(MODE)), \ |
20cdc894 | 124 | NULL, &proc_info_file_operations, \ |
631f9c18 AD |
125 | { .proc_read = read } ) |
126 | #define ONE(NAME, MODE, show) \ | |
be614086 EB |
127 | NOD(NAME, (S_IFREG|(MODE)), \ |
128 | NULL, &proc_single_file_operations, \ | |
631f9c18 | 129 | { .proc_show = show } ) |
1da177e4 | 130 | |
aed54175 VN |
131 | /* |
132 | * Count the number of hardlinks for the pid_entry table, excluding the . | |
133 | * and .. links. | |
134 | */ | |
135 | static unsigned int pid_entry_count_dirs(const struct pid_entry *entries, | |
136 | unsigned int n) | |
137 | { | |
138 | unsigned int i; | |
139 | unsigned int count; | |
140 | ||
141 | count = 0; | |
142 | for (i = 0; i < n; ++i) { | |
143 | if (S_ISDIR(entries[i].mode)) | |
144 | ++count; | |
145 | } | |
146 | ||
147 | return count; | |
148 | } | |
149 | ||
7c2c7d99 | 150 | static int get_fs_path(struct task_struct *task, struct path *path, bool root) |
1da177e4 LT |
151 | { |
152 | struct fs_struct *fs; | |
7c2c7d99 HD |
153 | int result = -ENOENT; |
154 | ||
0494f6ec MS |
155 | task_lock(task); |
156 | fs = task->fs; | |
7c2c7d99 HD |
157 | if (fs) { |
158 | read_lock(&fs->lock); | |
159 | *path = root ? fs->root : fs->pwd; | |
160 | path_get(path); | |
161 | read_unlock(&fs->lock); | |
162 | result = 0; | |
163 | } | |
0494f6ec | 164 | task_unlock(task); |
7c2c7d99 | 165 | return result; |
0494f6ec MS |
166 | } |
167 | ||
99f89551 EB |
168 | static int get_nr_threads(struct task_struct *tsk) |
169 | { | |
99f89551 EB |
170 | unsigned long flags; |
171 | int count = 0; | |
172 | ||
173 | if (lock_task_sighand(tsk, &flags)) { | |
174 | count = atomic_read(&tsk->signal->count); | |
175 | unlock_task_sighand(tsk, &flags); | |
176 | } | |
177 | return count; | |
178 | } | |
179 | ||
3dcd25f3 | 180 | static int proc_cwd_link(struct inode *inode, struct path *path) |
0494f6ec | 181 | { |
99f89551 | 182 | struct task_struct *task = get_proc_task(inode); |
0494f6ec | 183 | int result = -ENOENT; |
99f89551 EB |
184 | |
185 | if (task) { | |
7c2c7d99 | 186 | result = get_fs_path(task, path, 0); |
99f89551 EB |
187 | put_task_struct(task); |
188 | } | |
1da177e4 LT |
189 | return result; |
190 | } | |
191 | ||
3dcd25f3 | 192 | static int proc_root_link(struct inode *inode, struct path *path) |
1da177e4 | 193 | { |
99f89551 | 194 | struct task_struct *task = get_proc_task(inode); |
1da177e4 | 195 | int result = -ENOENT; |
99f89551 EB |
196 | |
197 | if (task) { | |
7c2c7d99 | 198 | result = get_fs_path(task, path, 1); |
99f89551 EB |
199 | put_task_struct(task); |
200 | } | |
1da177e4 LT |
201 | return result; |
202 | } | |
203 | ||
638fa202 RM |
204 | /* |
205 | * Return zero if current may access user memory in @task, -error if not. | |
206 | */ | |
207 | static int check_mem_permission(struct task_struct *task) | |
208 | { | |
209 | /* | |
210 | * A task can always look at itself, in case it chooses | |
211 | * to use system calls instead of load instructions. | |
212 | */ | |
213 | if (task == current) | |
214 | return 0; | |
215 | ||
216 | /* | |
217 | * If current is actively ptrace'ing, and would also be | |
218 | * permitted to freshly attach with ptrace now, permit it. | |
219 | */ | |
0d094efe RM |
220 | if (task_is_stopped_or_traced(task)) { |
221 | int match; | |
222 | rcu_read_lock(); | |
223 | match = (tracehook_tracer_task(task) == current); | |
224 | rcu_read_unlock(); | |
225 | if (match && ptrace_may_access(task, PTRACE_MODE_ATTACH)) | |
226 | return 0; | |
227 | } | |
638fa202 RM |
228 | |
229 | /* | |
230 | * Noone else is allowed. | |
231 | */ | |
232 | return -EPERM; | |
233 | } | |
1da177e4 | 234 | |
831830b5 AV |
235 | struct mm_struct *mm_for_maps(struct task_struct *task) |
236 | { | |
704b836c ON |
237 | struct mm_struct *mm; |
238 | ||
239 | if (mutex_lock_killable(&task->cred_guard_mutex)) | |
240 | return NULL; | |
00f89d21 | 241 | |
704b836c ON |
242 | mm = get_task_mm(task); |
243 | if (mm && mm != current->mm && | |
244 | !ptrace_may_access(task, PTRACE_MODE_READ)) { | |
245 | mmput(mm); | |
246 | mm = NULL; | |
13f0feaf | 247 | } |
704b836c ON |
248 | mutex_unlock(&task->cred_guard_mutex); |
249 | ||
831830b5 | 250 | return mm; |
831830b5 AV |
251 | } |
252 | ||
1da177e4 LT |
253 | static int proc_pid_cmdline(struct task_struct *task, char * buffer) |
254 | { | |
255 | int res = 0; | |
256 | unsigned int len; | |
257 | struct mm_struct *mm = get_task_mm(task); | |
258 | if (!mm) | |
259 | goto out; | |
260 | if (!mm->arg_end) | |
261 | goto out_mm; /* Shh! No looking before we're done */ | |
262 | ||
263 | len = mm->arg_end - mm->arg_start; | |
264 | ||
265 | if (len > PAGE_SIZE) | |
266 | len = PAGE_SIZE; | |
267 | ||
268 | res = access_process_vm(task, mm->arg_start, buffer, len, 0); | |
269 | ||
270 | // If the nul at the end of args has been overwritten, then | |
271 | // assume application is using setproctitle(3). | |
272 | if (res > 0 && buffer[res-1] != '\0' && len < PAGE_SIZE) { | |
273 | len = strnlen(buffer, res); | |
274 | if (len < res) { | |
275 | res = len; | |
276 | } else { | |
277 | len = mm->env_end - mm->env_start; | |
278 | if (len > PAGE_SIZE - res) | |
279 | len = PAGE_SIZE - res; | |
280 | res += access_process_vm(task, mm->env_start, buffer+res, len, 0); | |
281 | res = strnlen(buffer, res); | |
282 | } | |
283 | } | |
284 | out_mm: | |
285 | mmput(mm); | |
286 | out: | |
287 | return res; | |
288 | } | |
289 | ||
290 | static int proc_pid_auxv(struct task_struct *task, char *buffer) | |
291 | { | |
292 | int res = 0; | |
293 | struct mm_struct *mm = get_task_mm(task); | |
294 | if (mm) { | |
295 | unsigned int nwords = 0; | |
dfe6b7d9 | 296 | do { |
1da177e4 | 297 | nwords += 2; |
dfe6b7d9 | 298 | } while (mm->saved_auxv[nwords - 2] != 0); /* AT_NULL */ |
1da177e4 LT |
299 | res = nwords * sizeof(mm->saved_auxv[0]); |
300 | if (res > PAGE_SIZE) | |
301 | res = PAGE_SIZE; | |
302 | memcpy(buffer, mm->saved_auxv, res); | |
303 | mmput(mm); | |
304 | } | |
305 | return res; | |
306 | } | |
307 | ||
308 | ||
309 | #ifdef CONFIG_KALLSYMS | |
310 | /* | |
311 | * Provides a wchan file via kallsyms in a proper one-value-per-file format. | |
312 | * Returns the resolved symbol. If that fails, simply return the address. | |
313 | */ | |
314 | static int proc_pid_wchan(struct task_struct *task, char *buffer) | |
315 | { | |
ffb45122 | 316 | unsigned long wchan; |
9281acea | 317 | char symname[KSYM_NAME_LEN]; |
1da177e4 LT |
318 | |
319 | wchan = get_wchan(task); | |
320 | ||
9d65cb4a | 321 | if (lookup_symbol_name(wchan, symname) < 0) |
f83ce3e6 JE |
322 | if (!ptrace_may_access(task, PTRACE_MODE_READ)) |
323 | return 0; | |
324 | else | |
325 | return sprintf(buffer, "%lu", wchan); | |
9d65cb4a AD |
326 | else |
327 | return sprintf(buffer, "%s", symname); | |
1da177e4 LT |
328 | } |
329 | #endif /* CONFIG_KALLSYMS */ | |
330 | ||
2ec220e2 KC |
331 | #ifdef CONFIG_STACKTRACE |
332 | ||
333 | #define MAX_STACK_TRACE_DEPTH 64 | |
334 | ||
335 | static int proc_pid_stack(struct seq_file *m, struct pid_namespace *ns, | |
336 | struct pid *pid, struct task_struct *task) | |
337 | { | |
338 | struct stack_trace trace; | |
339 | unsigned long *entries; | |
340 | int i; | |
341 | ||
342 | entries = kmalloc(MAX_STACK_TRACE_DEPTH * sizeof(*entries), GFP_KERNEL); | |
343 | if (!entries) | |
344 | return -ENOMEM; | |
345 | ||
346 | trace.nr_entries = 0; | |
347 | trace.max_entries = MAX_STACK_TRACE_DEPTH; | |
348 | trace.entries = entries; | |
349 | trace.skip = 0; | |
350 | save_stack_trace_tsk(task, &trace); | |
351 | ||
352 | for (i = 0; i < trace.nr_entries; i++) { | |
353 | seq_printf(m, "[<%p>] %pS\n", | |
354 | (void *)entries[i], (void *)entries[i]); | |
355 | } | |
356 | kfree(entries); | |
357 | ||
358 | return 0; | |
359 | } | |
360 | #endif | |
361 | ||
1da177e4 LT |
362 | #ifdef CONFIG_SCHEDSTATS |
363 | /* | |
364 | * Provides /proc/PID/schedstat | |
365 | */ | |
366 | static int proc_pid_schedstat(struct task_struct *task, char *buffer) | |
367 | { | |
172ba844 | 368 | return sprintf(buffer, "%llu %llu %lu\n", |
826e08b0 IM |
369 | (unsigned long long)task->se.sum_exec_runtime, |
370 | (unsigned long long)task->sched_info.run_delay, | |
2d72376b | 371 | task->sched_info.pcount); |
1da177e4 LT |
372 | } |
373 | #endif | |
374 | ||
9745512c AV |
375 | #ifdef CONFIG_LATENCYTOP |
376 | static int lstats_show_proc(struct seq_file *m, void *v) | |
377 | { | |
378 | int i; | |
13d77c37 HS |
379 | struct inode *inode = m->private; |
380 | struct task_struct *task = get_proc_task(inode); | |
9745512c | 381 | |
13d77c37 HS |
382 | if (!task) |
383 | return -ESRCH; | |
384 | seq_puts(m, "Latency Top version : v0.1\n"); | |
9745512c AV |
385 | for (i = 0; i < 32; i++) { |
386 | if (task->latency_record[i].backtrace[0]) { | |
387 | int q; | |
388 | seq_printf(m, "%i %li %li ", | |
389 | task->latency_record[i].count, | |
390 | task->latency_record[i].time, | |
391 | task->latency_record[i].max); | |
392 | for (q = 0; q < LT_BACKTRACEDEPTH; q++) { | |
9c246247 | 393 | char sym[KSYM_SYMBOL_LEN]; |
9745512c AV |
394 | char *c; |
395 | if (!task->latency_record[i].backtrace[q]) | |
396 | break; | |
397 | if (task->latency_record[i].backtrace[q] == ULONG_MAX) | |
398 | break; | |
399 | sprint_symbol(sym, task->latency_record[i].backtrace[q]); | |
400 | c = strchr(sym, '+'); | |
401 | if (c) | |
402 | *c = 0; | |
403 | seq_printf(m, "%s ", sym); | |
404 | } | |
405 | seq_printf(m, "\n"); | |
406 | } | |
407 | ||
408 | } | |
13d77c37 | 409 | put_task_struct(task); |
9745512c AV |
410 | return 0; |
411 | } | |
412 | ||
413 | static int lstats_open(struct inode *inode, struct file *file) | |
414 | { | |
13d77c37 | 415 | return single_open(file, lstats_show_proc, inode); |
d6643d12 HS |
416 | } |
417 | ||
9745512c AV |
418 | static ssize_t lstats_write(struct file *file, const char __user *buf, |
419 | size_t count, loff_t *offs) | |
420 | { | |
13d77c37 | 421 | struct task_struct *task = get_proc_task(file->f_dentry->d_inode); |
9745512c | 422 | |
13d77c37 HS |
423 | if (!task) |
424 | return -ESRCH; | |
9745512c | 425 | clear_all_latency_tracing(task); |
13d77c37 | 426 | put_task_struct(task); |
9745512c AV |
427 | |
428 | return count; | |
429 | } | |
430 | ||
431 | static const struct file_operations proc_lstats_operations = { | |
432 | .open = lstats_open, | |
433 | .read = seq_read, | |
434 | .write = lstats_write, | |
435 | .llseek = seq_lseek, | |
13d77c37 | 436 | .release = single_release, |
9745512c AV |
437 | }; |
438 | ||
439 | #endif | |
440 | ||
1da177e4 LT |
441 | /* The badness from the OOM killer */ |
442 | unsigned long badness(struct task_struct *p, unsigned long uptime); | |
443 | static int proc_oom_score(struct task_struct *task, char *buffer) | |
444 | { | |
445 | unsigned long points; | |
446 | struct timespec uptime; | |
447 | ||
448 | do_posix_clock_monotonic_gettime(&uptime); | |
19c5d45a | 449 | read_lock(&tasklist_lock); |
495789a5 | 450 | points = badness(task->group_leader, uptime.tv_sec); |
19c5d45a | 451 | read_unlock(&tasklist_lock); |
1da177e4 LT |
452 | return sprintf(buffer, "%lu\n", points); |
453 | } | |
454 | ||
d85f50d5 NH |
455 | struct limit_names { |
456 | char *name; | |
457 | char *unit; | |
458 | }; | |
459 | ||
460 | static const struct limit_names lnames[RLIM_NLIMITS] = { | |
cff4edb5 | 461 | [RLIMIT_CPU] = {"Max cpu time", "seconds"}, |
d85f50d5 NH |
462 | [RLIMIT_FSIZE] = {"Max file size", "bytes"}, |
463 | [RLIMIT_DATA] = {"Max data size", "bytes"}, | |
464 | [RLIMIT_STACK] = {"Max stack size", "bytes"}, | |
465 | [RLIMIT_CORE] = {"Max core file size", "bytes"}, | |
466 | [RLIMIT_RSS] = {"Max resident set", "bytes"}, | |
467 | [RLIMIT_NPROC] = {"Max processes", "processes"}, | |
468 | [RLIMIT_NOFILE] = {"Max open files", "files"}, | |
469 | [RLIMIT_MEMLOCK] = {"Max locked memory", "bytes"}, | |
470 | [RLIMIT_AS] = {"Max address space", "bytes"}, | |
471 | [RLIMIT_LOCKS] = {"Max file locks", "locks"}, | |
472 | [RLIMIT_SIGPENDING] = {"Max pending signals", "signals"}, | |
473 | [RLIMIT_MSGQUEUE] = {"Max msgqueue size", "bytes"}, | |
474 | [RLIMIT_NICE] = {"Max nice priority", NULL}, | |
475 | [RLIMIT_RTPRIO] = {"Max realtime priority", NULL}, | |
8808117c | 476 | [RLIMIT_RTTIME] = {"Max realtime timeout", "us"}, |
d85f50d5 NH |
477 | }; |
478 | ||
479 | /* Display limits for a process */ | |
480 | static int proc_pid_limits(struct task_struct *task, char *buffer) | |
481 | { | |
482 | unsigned int i; | |
483 | int count = 0; | |
484 | unsigned long flags; | |
485 | char *bufptr = buffer; | |
486 | ||
487 | struct rlimit rlim[RLIM_NLIMITS]; | |
488 | ||
a6bebbc8 | 489 | if (!lock_task_sighand(task, &flags)) |
d85f50d5 | 490 | return 0; |
d85f50d5 NH |
491 | memcpy(rlim, task->signal->rlim, sizeof(struct rlimit) * RLIM_NLIMITS); |
492 | unlock_task_sighand(task, &flags); | |
d85f50d5 NH |
493 | |
494 | /* | |
495 | * print the file header | |
496 | */ | |
497 | count += sprintf(&bufptr[count], "%-25s %-20s %-20s %-10s\n", | |
498 | "Limit", "Soft Limit", "Hard Limit", "Units"); | |
499 | ||
500 | for (i = 0; i < RLIM_NLIMITS; i++) { | |
501 | if (rlim[i].rlim_cur == RLIM_INFINITY) | |
502 | count += sprintf(&bufptr[count], "%-25s %-20s ", | |
503 | lnames[i].name, "unlimited"); | |
504 | else | |
505 | count += sprintf(&bufptr[count], "%-25s %-20lu ", | |
506 | lnames[i].name, rlim[i].rlim_cur); | |
507 | ||
508 | if (rlim[i].rlim_max == RLIM_INFINITY) | |
509 | count += sprintf(&bufptr[count], "%-20s ", "unlimited"); | |
510 | else | |
511 | count += sprintf(&bufptr[count], "%-20lu ", | |
512 | rlim[i].rlim_max); | |
513 | ||
514 | if (lnames[i].unit) | |
515 | count += sprintf(&bufptr[count], "%-10s\n", | |
516 | lnames[i].unit); | |
517 | else | |
518 | count += sprintf(&bufptr[count], "\n"); | |
519 | } | |
520 | ||
521 | return count; | |
522 | } | |
523 | ||
ebcb6734 RM |
524 | #ifdef CONFIG_HAVE_ARCH_TRACEHOOK |
525 | static int proc_pid_syscall(struct task_struct *task, char *buffer) | |
526 | { | |
527 | long nr; | |
528 | unsigned long args[6], sp, pc; | |
529 | ||
530 | if (task_current_syscall(task, &nr, args, 6, &sp, &pc)) | |
531 | return sprintf(buffer, "running\n"); | |
532 | ||
533 | if (nr < 0) | |
534 | return sprintf(buffer, "%ld 0x%lx 0x%lx\n", nr, sp, pc); | |
535 | ||
536 | return sprintf(buffer, | |
537 | "%ld 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx\n", | |
538 | nr, | |
539 | args[0], args[1], args[2], args[3], args[4], args[5], | |
540 | sp, pc); | |
541 | } | |
542 | #endif /* CONFIG_HAVE_ARCH_TRACEHOOK */ | |
543 | ||
1da177e4 LT |
544 | /************************************************************************/ |
545 | /* Here the fs part begins */ | |
546 | /************************************************************************/ | |
547 | ||
548 | /* permission checks */ | |
778c1144 | 549 | static int proc_fd_access_allowed(struct inode *inode) |
1da177e4 | 550 | { |
778c1144 EB |
551 | struct task_struct *task; |
552 | int allowed = 0; | |
df26c40e EB |
553 | /* Allow access to a task's file descriptors if it is us or we |
554 | * may use ptrace attach to the process and find out that | |
555 | * information. | |
778c1144 EB |
556 | */ |
557 | task = get_proc_task(inode); | |
df26c40e | 558 | if (task) { |
006ebb40 | 559 | allowed = ptrace_may_access(task, PTRACE_MODE_READ); |
778c1144 | 560 | put_task_struct(task); |
df26c40e | 561 | } |
778c1144 | 562 | return allowed; |
1da177e4 LT |
563 | } |
564 | ||
6d76fa58 LT |
565 | static int proc_setattr(struct dentry *dentry, struct iattr *attr) |
566 | { | |
567 | int error; | |
568 | struct inode *inode = dentry->d_inode; | |
569 | ||
570 | if (attr->ia_valid & ATTR_MODE) | |
571 | return -EPERM; | |
572 | ||
573 | error = inode_change_ok(inode, attr); | |
1e8123fd JJ |
574 | if (!error) |
575 | error = inode_setattr(inode, attr); | |
6d76fa58 LT |
576 | return error; |
577 | } | |
578 | ||
c5ef1c42 | 579 | static const struct inode_operations proc_def_inode_operations = { |
6d76fa58 LT |
580 | .setattr = proc_setattr, |
581 | }; | |
582 | ||
a1a2c409 MS |
583 | static int mounts_open_common(struct inode *inode, struct file *file, |
584 | const struct seq_operations *op) | |
1da177e4 | 585 | { |
99f89551 | 586 | struct task_struct *task = get_proc_task(inode); |
cf7b708c | 587 | struct nsproxy *nsp; |
6b3286ed | 588 | struct mnt_namespace *ns = NULL; |
a1a2c409 | 589 | struct path root; |
5addc5dd AV |
590 | struct proc_mounts *p; |
591 | int ret = -EINVAL; | |
1da177e4 | 592 | |
99f89551 | 593 | if (task) { |
cf7b708c PE |
594 | rcu_read_lock(); |
595 | nsp = task_nsproxy(task); | |
596 | if (nsp) { | |
597 | ns = nsp->mnt_ns; | |
863c4702 AD |
598 | if (ns) |
599 | get_mnt_ns(ns); | |
600 | } | |
cf7b708c | 601 | rcu_read_unlock(); |
7c2c7d99 HD |
602 | if (ns && get_fs_path(task, &root, 1) == 0) |
603 | ret = 0; | |
99f89551 EB |
604 | put_task_struct(task); |
605 | } | |
5addc5dd | 606 | |
a1a2c409 MS |
607 | if (!ns) |
608 | goto err; | |
7c2c7d99 | 609 | if (ret) |
a1a2c409 MS |
610 | goto err_put_ns; |
611 | ||
a1a2c409 MS |
612 | ret = -ENOMEM; |
613 | p = kmalloc(sizeof(struct proc_mounts), GFP_KERNEL); | |
614 | if (!p) | |
615 | goto err_put_path; | |
616 | ||
617 | file->private_data = &p->m; | |
618 | ret = seq_open(file, op); | |
619 | if (ret) | |
620 | goto err_free; | |
621 | ||
622 | p->m.private = p; | |
623 | p->ns = ns; | |
624 | p->root = root; | |
625 | p->event = ns->event; | |
626 | ||
627 | return 0; | |
628 | ||
629 | err_free: | |
630 | kfree(p); | |
631 | err_put_path: | |
632 | path_put(&root); | |
633 | err_put_ns: | |
634 | put_mnt_ns(ns); | |
635 | err: | |
1da177e4 LT |
636 | return ret; |
637 | } | |
638 | ||
639 | static int mounts_release(struct inode *inode, struct file *file) | |
640 | { | |
a1a2c409 MS |
641 | struct proc_mounts *p = file->private_data; |
642 | path_put(&p->root); | |
643 | put_mnt_ns(p->ns); | |
1da177e4 LT |
644 | return seq_release(inode, file); |
645 | } | |
646 | ||
5addc5dd AV |
647 | static unsigned mounts_poll(struct file *file, poll_table *wait) |
648 | { | |
649 | struct proc_mounts *p = file->private_data; | |
a1a2c409 | 650 | struct mnt_namespace *ns = p->ns; |
31b07093 | 651 | unsigned res = POLLIN | POLLRDNORM; |
5addc5dd AV |
652 | |
653 | poll_wait(file, &ns->poll, wait); | |
654 | ||
655 | spin_lock(&vfsmount_lock); | |
656 | if (p->event != ns->event) { | |
657 | p->event = ns->event; | |
31b07093 | 658 | res |= POLLERR | POLLPRI; |
5addc5dd AV |
659 | } |
660 | spin_unlock(&vfsmount_lock); | |
661 | ||
662 | return res; | |
663 | } | |
664 | ||
a1a2c409 MS |
665 | static int mounts_open(struct inode *inode, struct file *file) |
666 | { | |
667 | return mounts_open_common(inode, file, &mounts_op); | |
668 | } | |
669 | ||
00977a59 | 670 | static const struct file_operations proc_mounts_operations = { |
1da177e4 LT |
671 | .open = mounts_open, |
672 | .read = seq_read, | |
673 | .llseek = seq_lseek, | |
674 | .release = mounts_release, | |
5addc5dd | 675 | .poll = mounts_poll, |
1da177e4 LT |
676 | }; |
677 | ||
2d4d4864 RP |
678 | static int mountinfo_open(struct inode *inode, struct file *file) |
679 | { | |
680 | return mounts_open_common(inode, file, &mountinfo_op); | |
681 | } | |
682 | ||
683 | static const struct file_operations proc_mountinfo_operations = { | |
684 | .open = mountinfo_open, | |
685 | .read = seq_read, | |
686 | .llseek = seq_lseek, | |
687 | .release = mounts_release, | |
688 | .poll = mounts_poll, | |
689 | }; | |
690 | ||
b4629fe2 CL |
691 | static int mountstats_open(struct inode *inode, struct file *file) |
692 | { | |
a1a2c409 | 693 | return mounts_open_common(inode, file, &mountstats_op); |
b4629fe2 CL |
694 | } |
695 | ||
00977a59 | 696 | static const struct file_operations proc_mountstats_operations = { |
b4629fe2 CL |
697 | .open = mountstats_open, |
698 | .read = seq_read, | |
699 | .llseek = seq_lseek, | |
700 | .release = mounts_release, | |
701 | }; | |
702 | ||
1da177e4 LT |
703 | #define PROC_BLOCK_SIZE (3*1024) /* 4K page size but our output routines use some slack for overruns */ |
704 | ||
705 | static ssize_t proc_info_read(struct file * file, char __user * buf, | |
706 | size_t count, loff_t *ppos) | |
707 | { | |
2fddfeef | 708 | struct inode * inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
709 | unsigned long page; |
710 | ssize_t length; | |
99f89551 EB |
711 | struct task_struct *task = get_proc_task(inode); |
712 | ||
713 | length = -ESRCH; | |
714 | if (!task) | |
715 | goto out_no_task; | |
1da177e4 LT |
716 | |
717 | if (count > PROC_BLOCK_SIZE) | |
718 | count = PROC_BLOCK_SIZE; | |
99f89551 EB |
719 | |
720 | length = -ENOMEM; | |
e12ba74d | 721 | if (!(page = __get_free_page(GFP_TEMPORARY))) |
99f89551 | 722 | goto out; |
1da177e4 LT |
723 | |
724 | length = PROC_I(inode)->op.proc_read(task, (char*)page); | |
725 | ||
726 | if (length >= 0) | |
727 | length = simple_read_from_buffer(buf, count, ppos, (char *)page, length); | |
728 | free_page(page); | |
99f89551 EB |
729 | out: |
730 | put_task_struct(task); | |
731 | out_no_task: | |
1da177e4 LT |
732 | return length; |
733 | } | |
734 | ||
00977a59 | 735 | static const struct file_operations proc_info_file_operations = { |
1da177e4 LT |
736 | .read = proc_info_read, |
737 | }; | |
738 | ||
be614086 EB |
739 | static int proc_single_show(struct seq_file *m, void *v) |
740 | { | |
741 | struct inode *inode = m->private; | |
742 | struct pid_namespace *ns; | |
743 | struct pid *pid; | |
744 | struct task_struct *task; | |
745 | int ret; | |
746 | ||
747 | ns = inode->i_sb->s_fs_info; | |
748 | pid = proc_pid(inode); | |
749 | task = get_pid_task(pid, PIDTYPE_PID); | |
750 | if (!task) | |
751 | return -ESRCH; | |
752 | ||
753 | ret = PROC_I(inode)->op.proc_show(m, ns, pid, task); | |
754 | ||
755 | put_task_struct(task); | |
756 | return ret; | |
757 | } | |
758 | ||
759 | static int proc_single_open(struct inode *inode, struct file *filp) | |
760 | { | |
761 | int ret; | |
762 | ret = single_open(filp, proc_single_show, NULL); | |
763 | if (!ret) { | |
764 | struct seq_file *m = filp->private_data; | |
765 | ||
766 | m->private = inode; | |
767 | } | |
768 | return ret; | |
769 | } | |
770 | ||
771 | static const struct file_operations proc_single_file_operations = { | |
772 | .open = proc_single_open, | |
773 | .read = seq_read, | |
774 | .llseek = seq_lseek, | |
775 | .release = single_release, | |
776 | }; | |
777 | ||
1da177e4 LT |
778 | static int mem_open(struct inode* inode, struct file* file) |
779 | { | |
780 | file->private_data = (void*)((long)current->self_exec_id); | |
781 | return 0; | |
782 | } | |
783 | ||
784 | static ssize_t mem_read(struct file * file, char __user * buf, | |
785 | size_t count, loff_t *ppos) | |
786 | { | |
2fddfeef | 787 | struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode); |
1da177e4 LT |
788 | char *page; |
789 | unsigned long src = *ppos; | |
790 | int ret = -ESRCH; | |
791 | struct mm_struct *mm; | |
792 | ||
99f89551 EB |
793 | if (!task) |
794 | goto out_no_task; | |
795 | ||
638fa202 | 796 | if (check_mem_permission(task)) |
1da177e4 LT |
797 | goto out; |
798 | ||
799 | ret = -ENOMEM; | |
e12ba74d | 800 | page = (char *)__get_free_page(GFP_TEMPORARY); |
1da177e4 LT |
801 | if (!page) |
802 | goto out; | |
803 | ||
804 | ret = 0; | |
805 | ||
806 | mm = get_task_mm(task); | |
807 | if (!mm) | |
808 | goto out_free; | |
809 | ||
810 | ret = -EIO; | |
811 | ||
812 | if (file->private_data != (void*)((long)current->self_exec_id)) | |
813 | goto out_put; | |
814 | ||
815 | ret = 0; | |
816 | ||
817 | while (count > 0) { | |
818 | int this_len, retval; | |
819 | ||
820 | this_len = (count > PAGE_SIZE) ? PAGE_SIZE : count; | |
821 | retval = access_process_vm(task, src, page, this_len, 0); | |
638fa202 | 822 | if (!retval || check_mem_permission(task)) { |
1da177e4 LT |
823 | if (!ret) |
824 | ret = -EIO; | |
825 | break; | |
826 | } | |
827 | ||
828 | if (copy_to_user(buf, page, retval)) { | |
829 | ret = -EFAULT; | |
830 | break; | |
831 | } | |
832 | ||
833 | ret += retval; | |
834 | src += retval; | |
835 | buf += retval; | |
836 | count -= retval; | |
837 | } | |
838 | *ppos = src; | |
839 | ||
840 | out_put: | |
841 | mmput(mm); | |
842 | out_free: | |
843 | free_page((unsigned long) page); | |
844 | out: | |
99f89551 EB |
845 | put_task_struct(task); |
846 | out_no_task: | |
1da177e4 LT |
847 | return ret; |
848 | } | |
849 | ||
850 | #define mem_write NULL | |
851 | ||
852 | #ifndef mem_write | |
853 | /* This is a security hazard */ | |
63967fa9 | 854 | static ssize_t mem_write(struct file * file, const char __user *buf, |
1da177e4 LT |
855 | size_t count, loff_t *ppos) |
856 | { | |
f7ca54f4 | 857 | int copied; |
1da177e4 | 858 | char *page; |
2fddfeef | 859 | struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode); |
1da177e4 LT |
860 | unsigned long dst = *ppos; |
861 | ||
99f89551 EB |
862 | copied = -ESRCH; |
863 | if (!task) | |
864 | goto out_no_task; | |
865 | ||
638fa202 | 866 | if (check_mem_permission(task)) |
99f89551 | 867 | goto out; |
1da177e4 | 868 | |
99f89551 | 869 | copied = -ENOMEM; |
e12ba74d | 870 | page = (char *)__get_free_page(GFP_TEMPORARY); |
1da177e4 | 871 | if (!page) |
99f89551 | 872 | goto out; |
1da177e4 | 873 | |
f7ca54f4 | 874 | copied = 0; |
1da177e4 LT |
875 | while (count > 0) { |
876 | int this_len, retval; | |
877 | ||
878 | this_len = (count > PAGE_SIZE) ? PAGE_SIZE : count; | |
879 | if (copy_from_user(page, buf, this_len)) { | |
880 | copied = -EFAULT; | |
881 | break; | |
882 | } | |
883 | retval = access_process_vm(task, dst, page, this_len, 1); | |
884 | if (!retval) { | |
885 | if (!copied) | |
886 | copied = -EIO; | |
887 | break; | |
888 | } | |
889 | copied += retval; | |
890 | buf += retval; | |
891 | dst += retval; | |
892 | count -= retval; | |
893 | } | |
894 | *ppos = dst; | |
895 | free_page((unsigned long) page); | |
99f89551 EB |
896 | out: |
897 | put_task_struct(task); | |
898 | out_no_task: | |
1da177e4 LT |
899 | return copied; |
900 | } | |
901 | #endif | |
902 | ||
85863e47 | 903 | loff_t mem_lseek(struct file *file, loff_t offset, int orig) |
1da177e4 LT |
904 | { |
905 | switch (orig) { | |
906 | case 0: | |
907 | file->f_pos = offset; | |
908 | break; | |
909 | case 1: | |
910 | file->f_pos += offset; | |
911 | break; | |
912 | default: | |
913 | return -EINVAL; | |
914 | } | |
915 | force_successful_syscall_return(); | |
916 | return file->f_pos; | |
917 | } | |
918 | ||
00977a59 | 919 | static const struct file_operations proc_mem_operations = { |
1da177e4 LT |
920 | .llseek = mem_lseek, |
921 | .read = mem_read, | |
922 | .write = mem_write, | |
923 | .open = mem_open, | |
924 | }; | |
925 | ||
315e28c8 JP |
926 | static ssize_t environ_read(struct file *file, char __user *buf, |
927 | size_t count, loff_t *ppos) | |
928 | { | |
929 | struct task_struct *task = get_proc_task(file->f_dentry->d_inode); | |
930 | char *page; | |
931 | unsigned long src = *ppos; | |
932 | int ret = -ESRCH; | |
933 | struct mm_struct *mm; | |
934 | ||
935 | if (!task) | |
936 | goto out_no_task; | |
937 | ||
006ebb40 | 938 | if (!ptrace_may_access(task, PTRACE_MODE_READ)) |
315e28c8 JP |
939 | goto out; |
940 | ||
941 | ret = -ENOMEM; | |
942 | page = (char *)__get_free_page(GFP_TEMPORARY); | |
943 | if (!page) | |
944 | goto out; | |
945 | ||
946 | ret = 0; | |
947 | ||
948 | mm = get_task_mm(task); | |
949 | if (!mm) | |
950 | goto out_free; | |
951 | ||
952 | while (count > 0) { | |
953 | int this_len, retval, max_len; | |
954 | ||
955 | this_len = mm->env_end - (mm->env_start + src); | |
956 | ||
957 | if (this_len <= 0) | |
958 | break; | |
959 | ||
960 | max_len = (count > PAGE_SIZE) ? PAGE_SIZE : count; | |
961 | this_len = (this_len > max_len) ? max_len : this_len; | |
962 | ||
963 | retval = access_process_vm(task, (mm->env_start + src), | |
964 | page, this_len, 0); | |
965 | ||
966 | if (retval <= 0) { | |
967 | ret = retval; | |
968 | break; | |
969 | } | |
970 | ||
971 | if (copy_to_user(buf, page, retval)) { | |
972 | ret = -EFAULT; | |
973 | break; | |
974 | } | |
975 | ||
976 | ret += retval; | |
977 | src += retval; | |
978 | buf += retval; | |
979 | count -= retval; | |
980 | } | |
981 | *ppos = src; | |
982 | ||
983 | mmput(mm); | |
984 | out_free: | |
985 | free_page((unsigned long) page); | |
986 | out: | |
987 | put_task_struct(task); | |
988 | out_no_task: | |
989 | return ret; | |
990 | } | |
991 | ||
992 | static const struct file_operations proc_environ_operations = { | |
993 | .read = environ_read, | |
994 | }; | |
995 | ||
1da177e4 LT |
996 | static ssize_t oom_adjust_read(struct file *file, char __user *buf, |
997 | size_t count, loff_t *ppos) | |
998 | { | |
2fddfeef | 999 | struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode); |
8578cea7 | 1000 | char buffer[PROC_NUMBUF]; |
1da177e4 | 1001 | size_t len; |
28b83c51 KM |
1002 | int oom_adjust = OOM_DISABLE; |
1003 | unsigned long flags; | |
1da177e4 | 1004 | |
99f89551 EB |
1005 | if (!task) |
1006 | return -ESRCH; | |
28b83c51 KM |
1007 | |
1008 | if (lock_task_sighand(task, &flags)) { | |
1009 | oom_adjust = task->signal->oom_adj; | |
1010 | unlock_task_sighand(task, &flags); | |
1011 | } | |
1012 | ||
99f89551 EB |
1013 | put_task_struct(task); |
1014 | ||
8578cea7 | 1015 | len = snprintf(buffer, sizeof(buffer), "%i\n", oom_adjust); |
0c28f287 AM |
1016 | |
1017 | return simple_read_from_buffer(buf, count, ppos, buffer, len); | |
1da177e4 LT |
1018 | } |
1019 | ||
1020 | static ssize_t oom_adjust_write(struct file *file, const char __user *buf, | |
1021 | size_t count, loff_t *ppos) | |
1022 | { | |
99f89551 | 1023 | struct task_struct *task; |
5d863b89 KM |
1024 | char buffer[PROC_NUMBUF]; |
1025 | long oom_adjust; | |
28b83c51 | 1026 | unsigned long flags; |
5d863b89 | 1027 | int err; |
1da177e4 | 1028 | |
8578cea7 EB |
1029 | memset(buffer, 0, sizeof(buffer)); |
1030 | if (count > sizeof(buffer) - 1) | |
1031 | count = sizeof(buffer) - 1; | |
1da177e4 LT |
1032 | if (copy_from_user(buffer, buf, count)) |
1033 | return -EFAULT; | |
5d863b89 KM |
1034 | |
1035 | err = strict_strtol(strstrip(buffer), 0, &oom_adjust); | |
1036 | if (err) | |
1037 | return -EINVAL; | |
8ac773b4 AD |
1038 | if ((oom_adjust < OOM_ADJUST_MIN || oom_adjust > OOM_ADJUST_MAX) && |
1039 | oom_adjust != OOM_DISABLE) | |
1da177e4 | 1040 | return -EINVAL; |
5d863b89 | 1041 | |
2fddfeef | 1042 | task = get_proc_task(file->f_path.dentry->d_inode); |
99f89551 EB |
1043 | if (!task) |
1044 | return -ESRCH; | |
28b83c51 KM |
1045 | if (!lock_task_sighand(task, &flags)) { |
1046 | put_task_struct(task); | |
1047 | return -ESRCH; | |
1048 | } | |
1049 | ||
1050 | if (oom_adjust < task->signal->oom_adj && !capable(CAP_SYS_RESOURCE)) { | |
1051 | unlock_task_sighand(task, &flags); | |
8fb4fc68 GJ |
1052 | put_task_struct(task); |
1053 | return -EACCES; | |
1054 | } | |
28b83c51 KM |
1055 | |
1056 | task->signal->oom_adj = oom_adjust; | |
1057 | ||
1058 | unlock_task_sighand(task, &flags); | |
99f89551 | 1059 | put_task_struct(task); |
5d863b89 KM |
1060 | |
1061 | return count; | |
1da177e4 LT |
1062 | } |
1063 | ||
00977a59 | 1064 | static const struct file_operations proc_oom_adjust_operations = { |
1da177e4 LT |
1065 | .read = oom_adjust_read, |
1066 | .write = oom_adjust_write, | |
1067 | }; | |
1068 | ||
1da177e4 LT |
1069 | #ifdef CONFIG_AUDITSYSCALL |
1070 | #define TMPBUFLEN 21 | |
1071 | static ssize_t proc_loginuid_read(struct file * file, char __user * buf, | |
1072 | size_t count, loff_t *ppos) | |
1073 | { | |
2fddfeef | 1074 | struct inode * inode = file->f_path.dentry->d_inode; |
99f89551 | 1075 | struct task_struct *task = get_proc_task(inode); |
1da177e4 LT |
1076 | ssize_t length; |
1077 | char tmpbuf[TMPBUFLEN]; | |
1078 | ||
99f89551 EB |
1079 | if (!task) |
1080 | return -ESRCH; | |
1da177e4 | 1081 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", |
0c11b942 | 1082 | audit_get_loginuid(task)); |
99f89551 | 1083 | put_task_struct(task); |
1da177e4 LT |
1084 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); |
1085 | } | |
1086 | ||
1087 | static ssize_t proc_loginuid_write(struct file * file, const char __user * buf, | |
1088 | size_t count, loff_t *ppos) | |
1089 | { | |
2fddfeef | 1090 | struct inode * inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
1091 | char *page, *tmp; |
1092 | ssize_t length; | |
1da177e4 LT |
1093 | uid_t loginuid; |
1094 | ||
1095 | if (!capable(CAP_AUDIT_CONTROL)) | |
1096 | return -EPERM; | |
1097 | ||
13b41b09 | 1098 | if (current != pid_task(proc_pid(inode), PIDTYPE_PID)) |
1da177e4 LT |
1099 | return -EPERM; |
1100 | ||
e0182909 AV |
1101 | if (count >= PAGE_SIZE) |
1102 | count = PAGE_SIZE - 1; | |
1da177e4 LT |
1103 | |
1104 | if (*ppos != 0) { | |
1105 | /* No partial writes. */ | |
1106 | return -EINVAL; | |
1107 | } | |
e12ba74d | 1108 | page = (char*)__get_free_page(GFP_TEMPORARY); |
1da177e4 LT |
1109 | if (!page) |
1110 | return -ENOMEM; | |
1111 | length = -EFAULT; | |
1112 | if (copy_from_user(page, buf, count)) | |
1113 | goto out_free_page; | |
1114 | ||
e0182909 | 1115 | page[count] = '\0'; |
1da177e4 LT |
1116 | loginuid = simple_strtoul(page, &tmp, 10); |
1117 | if (tmp == page) { | |
1118 | length = -EINVAL; | |
1119 | goto out_free_page; | |
1120 | ||
1121 | } | |
99f89551 | 1122 | length = audit_set_loginuid(current, loginuid); |
1da177e4 LT |
1123 | if (likely(length == 0)) |
1124 | length = count; | |
1125 | ||
1126 | out_free_page: | |
1127 | free_page((unsigned long) page); | |
1128 | return length; | |
1129 | } | |
1130 | ||
00977a59 | 1131 | static const struct file_operations proc_loginuid_operations = { |
1da177e4 LT |
1132 | .read = proc_loginuid_read, |
1133 | .write = proc_loginuid_write, | |
1134 | }; | |
1e0bd755 EP |
1135 | |
1136 | static ssize_t proc_sessionid_read(struct file * file, char __user * buf, | |
1137 | size_t count, loff_t *ppos) | |
1138 | { | |
1139 | struct inode * inode = file->f_path.dentry->d_inode; | |
1140 | struct task_struct *task = get_proc_task(inode); | |
1141 | ssize_t length; | |
1142 | char tmpbuf[TMPBUFLEN]; | |
1143 | ||
1144 | if (!task) | |
1145 | return -ESRCH; | |
1146 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", | |
1147 | audit_get_sessionid(task)); | |
1148 | put_task_struct(task); | |
1149 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); | |
1150 | } | |
1151 | ||
1152 | static const struct file_operations proc_sessionid_operations = { | |
1153 | .read = proc_sessionid_read, | |
1154 | }; | |
1da177e4 LT |
1155 | #endif |
1156 | ||
f4f154fd AM |
1157 | #ifdef CONFIG_FAULT_INJECTION |
1158 | static ssize_t proc_fault_inject_read(struct file * file, char __user * buf, | |
1159 | size_t count, loff_t *ppos) | |
1160 | { | |
1161 | struct task_struct *task = get_proc_task(file->f_dentry->d_inode); | |
1162 | char buffer[PROC_NUMBUF]; | |
1163 | size_t len; | |
1164 | int make_it_fail; | |
f4f154fd AM |
1165 | |
1166 | if (!task) | |
1167 | return -ESRCH; | |
1168 | make_it_fail = task->make_it_fail; | |
1169 | put_task_struct(task); | |
1170 | ||
1171 | len = snprintf(buffer, sizeof(buffer), "%i\n", make_it_fail); | |
0c28f287 AM |
1172 | |
1173 | return simple_read_from_buffer(buf, count, ppos, buffer, len); | |
f4f154fd AM |
1174 | } |
1175 | ||
1176 | static ssize_t proc_fault_inject_write(struct file * file, | |
1177 | const char __user * buf, size_t count, loff_t *ppos) | |
1178 | { | |
1179 | struct task_struct *task; | |
1180 | char buffer[PROC_NUMBUF], *end; | |
1181 | int make_it_fail; | |
1182 | ||
1183 | if (!capable(CAP_SYS_RESOURCE)) | |
1184 | return -EPERM; | |
1185 | memset(buffer, 0, sizeof(buffer)); | |
1186 | if (count > sizeof(buffer) - 1) | |
1187 | count = sizeof(buffer) - 1; | |
1188 | if (copy_from_user(buffer, buf, count)) | |
1189 | return -EFAULT; | |
1190 | make_it_fail = simple_strtol(buffer, &end, 0); | |
1191 | if (*end == '\n') | |
1192 | end++; | |
1193 | task = get_proc_task(file->f_dentry->d_inode); | |
1194 | if (!task) | |
1195 | return -ESRCH; | |
1196 | task->make_it_fail = make_it_fail; | |
1197 | put_task_struct(task); | |
1198 | if (end - buffer == 0) | |
1199 | return -EIO; | |
1200 | return end - buffer; | |
1201 | } | |
1202 | ||
00977a59 | 1203 | static const struct file_operations proc_fault_inject_operations = { |
f4f154fd AM |
1204 | .read = proc_fault_inject_read, |
1205 | .write = proc_fault_inject_write, | |
1206 | }; | |
1207 | #endif | |
1208 | ||
9745512c | 1209 | |
43ae34cb IM |
1210 | #ifdef CONFIG_SCHED_DEBUG |
1211 | /* | |
1212 | * Print out various scheduling related per-task fields: | |
1213 | */ | |
1214 | static int sched_show(struct seq_file *m, void *v) | |
1215 | { | |
1216 | struct inode *inode = m->private; | |
1217 | struct task_struct *p; | |
1218 | ||
43ae34cb IM |
1219 | p = get_proc_task(inode); |
1220 | if (!p) | |
1221 | return -ESRCH; | |
1222 | proc_sched_show_task(p, m); | |
1223 | ||
1224 | put_task_struct(p); | |
1225 | ||
1226 | return 0; | |
1227 | } | |
1228 | ||
1229 | static ssize_t | |
1230 | sched_write(struct file *file, const char __user *buf, | |
1231 | size_t count, loff_t *offset) | |
1232 | { | |
1233 | struct inode *inode = file->f_path.dentry->d_inode; | |
1234 | struct task_struct *p; | |
1235 | ||
43ae34cb IM |
1236 | p = get_proc_task(inode); |
1237 | if (!p) | |
1238 | return -ESRCH; | |
1239 | proc_sched_set_task(p); | |
1240 | ||
1241 | put_task_struct(p); | |
1242 | ||
1243 | return count; | |
1244 | } | |
1245 | ||
1246 | static int sched_open(struct inode *inode, struct file *filp) | |
1247 | { | |
1248 | int ret; | |
1249 | ||
1250 | ret = single_open(filp, sched_show, NULL); | |
1251 | if (!ret) { | |
1252 | struct seq_file *m = filp->private_data; | |
1253 | ||
1254 | m->private = inode; | |
1255 | } | |
1256 | return ret; | |
1257 | } | |
1258 | ||
1259 | static const struct file_operations proc_pid_sched_operations = { | |
1260 | .open = sched_open, | |
1261 | .read = seq_read, | |
1262 | .write = sched_write, | |
1263 | .llseek = seq_lseek, | |
5ea473a1 | 1264 | .release = single_release, |
43ae34cb IM |
1265 | }; |
1266 | ||
1267 | #endif | |
1268 | ||
925d1c40 MH |
1269 | /* |
1270 | * We added or removed a vma mapping the executable. The vmas are only mapped | |
1271 | * during exec and are not mapped with the mmap system call. | |
1272 | * Callers must hold down_write() on the mm's mmap_sem for these | |
1273 | */ | |
1274 | void added_exe_file_vma(struct mm_struct *mm) | |
1275 | { | |
1276 | mm->num_exe_file_vmas++; | |
1277 | } | |
1278 | ||
1279 | void removed_exe_file_vma(struct mm_struct *mm) | |
1280 | { | |
1281 | mm->num_exe_file_vmas--; | |
1282 | if ((mm->num_exe_file_vmas == 0) && mm->exe_file){ | |
1283 | fput(mm->exe_file); | |
1284 | mm->exe_file = NULL; | |
1285 | } | |
1286 | ||
1287 | } | |
1288 | ||
1289 | void set_mm_exe_file(struct mm_struct *mm, struct file *new_exe_file) | |
1290 | { | |
1291 | if (new_exe_file) | |
1292 | get_file(new_exe_file); | |
1293 | if (mm->exe_file) | |
1294 | fput(mm->exe_file); | |
1295 | mm->exe_file = new_exe_file; | |
1296 | mm->num_exe_file_vmas = 0; | |
1297 | } | |
1298 | ||
1299 | struct file *get_mm_exe_file(struct mm_struct *mm) | |
1300 | { | |
1301 | struct file *exe_file; | |
1302 | ||
1303 | /* We need mmap_sem to protect against races with removal of | |
1304 | * VM_EXECUTABLE vmas */ | |
1305 | down_read(&mm->mmap_sem); | |
1306 | exe_file = mm->exe_file; | |
1307 | if (exe_file) | |
1308 | get_file(exe_file); | |
1309 | up_read(&mm->mmap_sem); | |
1310 | return exe_file; | |
1311 | } | |
1312 | ||
1313 | void dup_mm_exe_file(struct mm_struct *oldmm, struct mm_struct *newmm) | |
1314 | { | |
1315 | /* It's safe to write the exe_file pointer without exe_file_lock because | |
1316 | * this is called during fork when the task is not yet in /proc */ | |
1317 | newmm->exe_file = get_mm_exe_file(oldmm); | |
1318 | } | |
1319 | ||
1320 | static int proc_exe_link(struct inode *inode, struct path *exe_path) | |
1321 | { | |
1322 | struct task_struct *task; | |
1323 | struct mm_struct *mm; | |
1324 | struct file *exe_file; | |
1325 | ||
1326 | task = get_proc_task(inode); | |
1327 | if (!task) | |
1328 | return -ENOENT; | |
1329 | mm = get_task_mm(task); | |
1330 | put_task_struct(task); | |
1331 | if (!mm) | |
1332 | return -ENOENT; | |
1333 | exe_file = get_mm_exe_file(mm); | |
1334 | mmput(mm); | |
1335 | if (exe_file) { | |
1336 | *exe_path = exe_file->f_path; | |
1337 | path_get(&exe_file->f_path); | |
1338 | fput(exe_file); | |
1339 | return 0; | |
1340 | } else | |
1341 | return -ENOENT; | |
1342 | } | |
1343 | ||
008b150a | 1344 | static void *proc_pid_follow_link(struct dentry *dentry, struct nameidata *nd) |
1da177e4 LT |
1345 | { |
1346 | struct inode *inode = dentry->d_inode; | |
1347 | int error = -EACCES; | |
1348 | ||
1349 | /* We don't need a base pointer in the /proc filesystem */ | |
1d957f9b | 1350 | path_put(&nd->path); |
1da177e4 | 1351 | |
778c1144 EB |
1352 | /* Are we allowed to snoop on the tasks file descriptors? */ |
1353 | if (!proc_fd_access_allowed(inode)) | |
1da177e4 | 1354 | goto out; |
1da177e4 | 1355 | |
3dcd25f3 | 1356 | error = PROC_I(inode)->op.proc_get_link(inode, &nd->path); |
1da177e4 LT |
1357 | nd->last_type = LAST_BIND; |
1358 | out: | |
008b150a | 1359 | return ERR_PTR(error); |
1da177e4 LT |
1360 | } |
1361 | ||
3dcd25f3 | 1362 | static int do_proc_readlink(struct path *path, char __user *buffer, int buflen) |
1da177e4 | 1363 | { |
e12ba74d | 1364 | char *tmp = (char*)__get_free_page(GFP_TEMPORARY); |
3dcd25f3 | 1365 | char *pathname; |
1da177e4 LT |
1366 | int len; |
1367 | ||
1368 | if (!tmp) | |
1369 | return -ENOMEM; | |
0c28f287 | 1370 | |
cf28b486 | 1371 | pathname = d_path(path, tmp, PAGE_SIZE); |
3dcd25f3 JB |
1372 | len = PTR_ERR(pathname); |
1373 | if (IS_ERR(pathname)) | |
1da177e4 | 1374 | goto out; |
3dcd25f3 | 1375 | len = tmp + PAGE_SIZE - 1 - pathname; |
1da177e4 LT |
1376 | |
1377 | if (len > buflen) | |
1378 | len = buflen; | |
3dcd25f3 | 1379 | if (copy_to_user(buffer, pathname, len)) |
1da177e4 LT |
1380 | len = -EFAULT; |
1381 | out: | |
1382 | free_page((unsigned long)tmp); | |
1383 | return len; | |
1384 | } | |
1385 | ||
1386 | static int proc_pid_readlink(struct dentry * dentry, char __user * buffer, int buflen) | |
1387 | { | |
1388 | int error = -EACCES; | |
1389 | struct inode *inode = dentry->d_inode; | |
3dcd25f3 | 1390 | struct path path; |
1da177e4 | 1391 | |
778c1144 EB |
1392 | /* Are we allowed to snoop on the tasks file descriptors? */ |
1393 | if (!proc_fd_access_allowed(inode)) | |
1da177e4 | 1394 | goto out; |
1da177e4 | 1395 | |
3dcd25f3 | 1396 | error = PROC_I(inode)->op.proc_get_link(inode, &path); |
1da177e4 LT |
1397 | if (error) |
1398 | goto out; | |
1399 | ||
3dcd25f3 JB |
1400 | error = do_proc_readlink(&path, buffer, buflen); |
1401 | path_put(&path); | |
1da177e4 | 1402 | out: |
1da177e4 LT |
1403 | return error; |
1404 | } | |
1405 | ||
c5ef1c42 | 1406 | static const struct inode_operations proc_pid_link_inode_operations = { |
1da177e4 | 1407 | .readlink = proc_pid_readlink, |
6d76fa58 LT |
1408 | .follow_link = proc_pid_follow_link, |
1409 | .setattr = proc_setattr, | |
1da177e4 LT |
1410 | }; |
1411 | ||
28a6d671 EB |
1412 | |
1413 | /* building an inode */ | |
1414 | ||
1415 | static int task_dumpable(struct task_struct *task) | |
1da177e4 | 1416 | { |
28a6d671 EB |
1417 | int dumpable = 0; |
1418 | struct mm_struct *mm; | |
1da177e4 | 1419 | |
28a6d671 EB |
1420 | task_lock(task); |
1421 | mm = task->mm; | |
1422 | if (mm) | |
6c5d5238 | 1423 | dumpable = get_dumpable(mm); |
28a6d671 EB |
1424 | task_unlock(task); |
1425 | if(dumpable == 1) | |
1426 | return 1; | |
1427 | return 0; | |
1428 | } | |
1da177e4 | 1429 | |
1da177e4 | 1430 | |
61a28784 | 1431 | static struct inode *proc_pid_make_inode(struct super_block * sb, struct task_struct *task) |
28a6d671 EB |
1432 | { |
1433 | struct inode * inode; | |
1434 | struct proc_inode *ei; | |
c69e8d9c | 1435 | const struct cred *cred; |
1da177e4 | 1436 | |
28a6d671 | 1437 | /* We need a new inode */ |
1da177e4 | 1438 | |
28a6d671 EB |
1439 | inode = new_inode(sb); |
1440 | if (!inode) | |
1441 | goto out; | |
1442 | ||
1443 | /* Common stuff */ | |
1444 | ei = PROC_I(inode); | |
1445 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; | |
28a6d671 EB |
1446 | inode->i_op = &proc_def_inode_operations; |
1447 | ||
1448 | /* | |
1449 | * grab the reference to task. | |
1450 | */ | |
1a657f78 | 1451 | ei->pid = get_task_pid(task, PIDTYPE_PID); |
28a6d671 EB |
1452 | if (!ei->pid) |
1453 | goto out_unlock; | |
1454 | ||
28a6d671 | 1455 | if (task_dumpable(task)) { |
c69e8d9c DH |
1456 | rcu_read_lock(); |
1457 | cred = __task_cred(task); | |
1458 | inode->i_uid = cred->euid; | |
1459 | inode->i_gid = cred->egid; | |
1460 | rcu_read_unlock(); | |
1da177e4 | 1461 | } |
28a6d671 EB |
1462 | security_task_to_inode(task, inode); |
1463 | ||
1da177e4 | 1464 | out: |
28a6d671 EB |
1465 | return inode; |
1466 | ||
1467 | out_unlock: | |
1468 | iput(inode); | |
1469 | return NULL; | |
1da177e4 LT |
1470 | } |
1471 | ||
28a6d671 | 1472 | static int pid_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) |
1da177e4 | 1473 | { |
1da177e4 | 1474 | struct inode *inode = dentry->d_inode; |
28a6d671 | 1475 | struct task_struct *task; |
c69e8d9c DH |
1476 | const struct cred *cred; |
1477 | ||
28a6d671 | 1478 | generic_fillattr(inode, stat); |
1da177e4 | 1479 | |
28a6d671 EB |
1480 | rcu_read_lock(); |
1481 | stat->uid = 0; | |
1482 | stat->gid = 0; | |
1483 | task = pid_task(proc_pid(inode), PIDTYPE_PID); | |
1484 | if (task) { | |
1485 | if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) || | |
1486 | task_dumpable(task)) { | |
c69e8d9c DH |
1487 | cred = __task_cred(task); |
1488 | stat->uid = cred->euid; | |
1489 | stat->gid = cred->egid; | |
1da177e4 LT |
1490 | } |
1491 | } | |
28a6d671 | 1492 | rcu_read_unlock(); |
d6e71144 | 1493 | return 0; |
1da177e4 LT |
1494 | } |
1495 | ||
1da177e4 LT |
1496 | /* dentry stuff */ |
1497 | ||
1498 | /* | |
1499 | * Exceptional case: normally we are not allowed to unhash a busy | |
1500 | * directory. In this case, however, we can do it - no aliasing problems | |
1501 | * due to the way we treat inodes. | |
1502 | * | |
1503 | * Rewrite the inode's ownerships here because the owning task may have | |
1504 | * performed a setuid(), etc. | |
99f89551 EB |
1505 | * |
1506 | * Before the /proc/pid/status file was created the only way to read | |
1507 | * the effective uid of a /process was to stat /proc/pid. Reading | |
1508 | * /proc/pid/status is slow enough that procps and other packages | |
1509 | * kept stating /proc/pid. To keep the rules in /proc simple I have | |
1510 | * made this apply to all per process world readable and executable | |
1511 | * directories. | |
1da177e4 LT |
1512 | */ |
1513 | static int pid_revalidate(struct dentry *dentry, struct nameidata *nd) | |
1514 | { | |
1515 | struct inode *inode = dentry->d_inode; | |
99f89551 | 1516 | struct task_struct *task = get_proc_task(inode); |
c69e8d9c DH |
1517 | const struct cred *cred; |
1518 | ||
99f89551 EB |
1519 | if (task) { |
1520 | if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) || | |
1521 | task_dumpable(task)) { | |
c69e8d9c DH |
1522 | rcu_read_lock(); |
1523 | cred = __task_cred(task); | |
1524 | inode->i_uid = cred->euid; | |
1525 | inode->i_gid = cred->egid; | |
1526 | rcu_read_unlock(); | |
1da177e4 LT |
1527 | } else { |
1528 | inode->i_uid = 0; | |
1529 | inode->i_gid = 0; | |
1530 | } | |
9ee8ab9f | 1531 | inode->i_mode &= ~(S_ISUID | S_ISGID); |
1da177e4 | 1532 | security_task_to_inode(task, inode); |
99f89551 | 1533 | put_task_struct(task); |
1da177e4 LT |
1534 | return 1; |
1535 | } | |
1536 | d_drop(dentry); | |
1537 | return 0; | |
1538 | } | |
1539 | ||
28a6d671 | 1540 | static int pid_delete_dentry(struct dentry * dentry) |
99f89551 | 1541 | { |
28a6d671 EB |
1542 | /* Is the task we represent dead? |
1543 | * If so, then don't put the dentry on the lru list, | |
1544 | * kill it immediately. | |
1545 | */ | |
1546 | return !proc_pid(dentry->d_inode)->tasks[PIDTYPE_PID].first; | |
1547 | } | |
1548 | ||
d72f71eb | 1549 | static const struct dentry_operations pid_dentry_operations = |
28a6d671 EB |
1550 | { |
1551 | .d_revalidate = pid_revalidate, | |
1552 | .d_delete = pid_delete_dentry, | |
1553 | }; | |
1554 | ||
1555 | /* Lookups */ | |
1556 | ||
c5141e6d ED |
1557 | typedef struct dentry *instantiate_t(struct inode *, struct dentry *, |
1558 | struct task_struct *, const void *); | |
61a28784 | 1559 | |
1c0d04c9 EB |
1560 | /* |
1561 | * Fill a directory entry. | |
1562 | * | |
1563 | * If possible create the dcache entry and derive our inode number and | |
1564 | * file type from dcache entry. | |
1565 | * | |
1566 | * Since all of the proc inode numbers are dynamically generated, the inode | |
1567 | * numbers do not exist until the inode is cache. This means creating the | |
1568 | * the dcache entry in readdir is necessary to keep the inode numbers | |
1569 | * reported by readdir in sync with the inode numbers reported | |
1570 | * by stat. | |
1571 | */ | |
61a28784 EB |
1572 | static int proc_fill_cache(struct file *filp, void *dirent, filldir_t filldir, |
1573 | char *name, int len, | |
c5141e6d | 1574 | instantiate_t instantiate, struct task_struct *task, const void *ptr) |
61a28784 | 1575 | { |
2fddfeef | 1576 | struct dentry *child, *dir = filp->f_path.dentry; |
61a28784 EB |
1577 | struct inode *inode; |
1578 | struct qstr qname; | |
1579 | ino_t ino = 0; | |
1580 | unsigned type = DT_UNKNOWN; | |
1581 | ||
1582 | qname.name = name; | |
1583 | qname.len = len; | |
1584 | qname.hash = full_name_hash(name, len); | |
1585 | ||
1586 | child = d_lookup(dir, &qname); | |
1587 | if (!child) { | |
1588 | struct dentry *new; | |
1589 | new = d_alloc(dir, &qname); | |
1590 | if (new) { | |
1591 | child = instantiate(dir->d_inode, new, task, ptr); | |
1592 | if (child) | |
1593 | dput(new); | |
1594 | else | |
1595 | child = new; | |
1596 | } | |
1597 | } | |
1598 | if (!child || IS_ERR(child) || !child->d_inode) | |
1599 | goto end_instantiate; | |
1600 | inode = child->d_inode; | |
1601 | if (inode) { | |
1602 | ino = inode->i_ino; | |
1603 | type = inode->i_mode >> 12; | |
1604 | } | |
1605 | dput(child); | |
1606 | end_instantiate: | |
1607 | if (!ino) | |
1608 | ino = find_inode_number(dir, &qname); | |
1609 | if (!ino) | |
1610 | ino = 1; | |
1611 | return filldir(dirent, name, len, filp->f_pos, ino, type); | |
1612 | } | |
1613 | ||
28a6d671 EB |
1614 | static unsigned name_to_int(struct dentry *dentry) |
1615 | { | |
1616 | const char *name = dentry->d_name.name; | |
1617 | int len = dentry->d_name.len; | |
1618 | unsigned n = 0; | |
1619 | ||
1620 | if (len > 1 && *name == '0') | |
1621 | goto out; | |
1622 | while (len-- > 0) { | |
1623 | unsigned c = *name++ - '0'; | |
1624 | if (c > 9) | |
1625 | goto out; | |
1626 | if (n >= (~0U-9)/10) | |
1627 | goto out; | |
1628 | n *= 10; | |
1629 | n += c; | |
1630 | } | |
1631 | return n; | |
1632 | out: | |
1633 | return ~0U; | |
1634 | } | |
1635 | ||
27932742 MS |
1636 | #define PROC_FDINFO_MAX 64 |
1637 | ||
3dcd25f3 | 1638 | static int proc_fd_info(struct inode *inode, struct path *path, char *info) |
28a6d671 EB |
1639 | { |
1640 | struct task_struct *task = get_proc_task(inode); | |
1641 | struct files_struct *files = NULL; | |
1642 | struct file *file; | |
1643 | int fd = proc_fd(inode); | |
99f89551 | 1644 | |
99f89551 | 1645 | if (task) { |
28a6d671 EB |
1646 | files = get_files_struct(task); |
1647 | put_task_struct(task); | |
1648 | } | |
1649 | if (files) { | |
1650 | /* | |
1651 | * We are not taking a ref to the file structure, so we must | |
1652 | * hold ->file_lock. | |
1653 | */ | |
1654 | spin_lock(&files->file_lock); | |
1655 | file = fcheck_files(files, fd); | |
1656 | if (file) { | |
3dcd25f3 JB |
1657 | if (path) { |
1658 | *path = file->f_path; | |
1659 | path_get(&file->f_path); | |
1660 | } | |
27932742 MS |
1661 | if (info) |
1662 | snprintf(info, PROC_FDINFO_MAX, | |
1663 | "pos:\t%lli\n" | |
1664 | "flags:\t0%o\n", | |
1665 | (long long) file->f_pos, | |
1666 | file->f_flags); | |
28a6d671 EB |
1667 | spin_unlock(&files->file_lock); |
1668 | put_files_struct(files); | |
1669 | return 0; | |
99f89551 | 1670 | } |
28a6d671 EB |
1671 | spin_unlock(&files->file_lock); |
1672 | put_files_struct(files); | |
99f89551 | 1673 | } |
28a6d671 | 1674 | return -ENOENT; |
99f89551 EB |
1675 | } |
1676 | ||
3dcd25f3 | 1677 | static int proc_fd_link(struct inode *inode, struct path *path) |
27932742 | 1678 | { |
3dcd25f3 | 1679 | return proc_fd_info(inode, path, NULL); |
27932742 MS |
1680 | } |
1681 | ||
1da177e4 LT |
1682 | static int tid_fd_revalidate(struct dentry *dentry, struct nameidata *nd) |
1683 | { | |
1684 | struct inode *inode = dentry->d_inode; | |
99f89551 | 1685 | struct task_struct *task = get_proc_task(inode); |
aed7a6c4 | 1686 | int fd = proc_fd(inode); |
1da177e4 | 1687 | struct files_struct *files; |
c69e8d9c | 1688 | const struct cred *cred; |
1da177e4 | 1689 | |
99f89551 EB |
1690 | if (task) { |
1691 | files = get_files_struct(task); | |
1692 | if (files) { | |
1693 | rcu_read_lock(); | |
1694 | if (fcheck_files(files, fd)) { | |
1695 | rcu_read_unlock(); | |
1696 | put_files_struct(files); | |
1697 | if (task_dumpable(task)) { | |
c69e8d9c DH |
1698 | rcu_read_lock(); |
1699 | cred = __task_cred(task); | |
1700 | inode->i_uid = cred->euid; | |
1701 | inode->i_gid = cred->egid; | |
1702 | rcu_read_unlock(); | |
99f89551 EB |
1703 | } else { |
1704 | inode->i_uid = 0; | |
1705 | inode->i_gid = 0; | |
1706 | } | |
9ee8ab9f | 1707 | inode->i_mode &= ~(S_ISUID | S_ISGID); |
99f89551 EB |
1708 | security_task_to_inode(task, inode); |
1709 | put_task_struct(task); | |
1710 | return 1; | |
1711 | } | |
b835996f | 1712 | rcu_read_unlock(); |
1da177e4 | 1713 | put_files_struct(files); |
1da177e4 | 1714 | } |
99f89551 | 1715 | put_task_struct(task); |
1da177e4 LT |
1716 | } |
1717 | d_drop(dentry); | |
1718 | return 0; | |
1719 | } | |
1720 | ||
d72f71eb | 1721 | static const struct dentry_operations tid_fd_dentry_operations = |
1da177e4 LT |
1722 | { |
1723 | .d_revalidate = tid_fd_revalidate, | |
1724 | .d_delete = pid_delete_dentry, | |
1725 | }; | |
1726 | ||
444ceed8 | 1727 | static struct dentry *proc_fd_instantiate(struct inode *dir, |
c5141e6d | 1728 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
1da177e4 | 1729 | { |
c5141e6d | 1730 | unsigned fd = *(const unsigned *)ptr; |
444ceed8 EB |
1731 | struct file *file; |
1732 | struct files_struct *files; | |
1733 | struct inode *inode; | |
1734 | struct proc_inode *ei; | |
1735 | struct dentry *error = ERR_PTR(-ENOENT); | |
1da177e4 | 1736 | |
61a28784 | 1737 | inode = proc_pid_make_inode(dir->i_sb, task); |
1da177e4 LT |
1738 | if (!inode) |
1739 | goto out; | |
1740 | ei = PROC_I(inode); | |
aed7a6c4 | 1741 | ei->fd = fd; |
1da177e4 LT |
1742 | files = get_files_struct(task); |
1743 | if (!files) | |
444ceed8 | 1744 | goto out_iput; |
1da177e4 | 1745 | inode->i_mode = S_IFLNK; |
ca99c1da DS |
1746 | |
1747 | /* | |
1748 | * We are not taking a ref to the file structure, so we must | |
1749 | * hold ->file_lock. | |
1750 | */ | |
1751 | spin_lock(&files->file_lock); | |
1da177e4 LT |
1752 | file = fcheck_files(files, fd); |
1753 | if (!file) | |
444ceed8 | 1754 | goto out_unlock; |
aeb5d727 | 1755 | if (file->f_mode & FMODE_READ) |
1da177e4 | 1756 | inode->i_mode |= S_IRUSR | S_IXUSR; |
aeb5d727 | 1757 | if (file->f_mode & FMODE_WRITE) |
1da177e4 | 1758 | inode->i_mode |= S_IWUSR | S_IXUSR; |
ca99c1da | 1759 | spin_unlock(&files->file_lock); |
1da177e4 | 1760 | put_files_struct(files); |
444ceed8 | 1761 | |
1da177e4 LT |
1762 | inode->i_op = &proc_pid_link_inode_operations; |
1763 | inode->i_size = 64; | |
1764 | ei->op.proc_get_link = proc_fd_link; | |
1765 | dentry->d_op = &tid_fd_dentry_operations; | |
1766 | d_add(dentry, inode); | |
cd6a3ce9 EB |
1767 | /* Close the race of the process dying before we return the dentry */ |
1768 | if (tid_fd_revalidate(dentry, NULL)) | |
444ceed8 | 1769 | error = NULL; |
1da177e4 | 1770 | |
444ceed8 EB |
1771 | out: |
1772 | return error; | |
1773 | out_unlock: | |
ca99c1da | 1774 | spin_unlock(&files->file_lock); |
1da177e4 | 1775 | put_files_struct(files); |
444ceed8 | 1776 | out_iput: |
1da177e4 | 1777 | iput(inode); |
cd6a3ce9 | 1778 | goto out; |
1da177e4 LT |
1779 | } |
1780 | ||
27932742 MS |
1781 | static struct dentry *proc_lookupfd_common(struct inode *dir, |
1782 | struct dentry *dentry, | |
1783 | instantiate_t instantiate) | |
444ceed8 EB |
1784 | { |
1785 | struct task_struct *task = get_proc_task(dir); | |
1786 | unsigned fd = name_to_int(dentry); | |
1787 | struct dentry *result = ERR_PTR(-ENOENT); | |
1788 | ||
1789 | if (!task) | |
1790 | goto out_no_task; | |
1791 | if (fd == ~0U) | |
1792 | goto out; | |
1793 | ||
27932742 | 1794 | result = instantiate(dir, dentry, task, &fd); |
444ceed8 EB |
1795 | out: |
1796 | put_task_struct(task); | |
1797 | out_no_task: | |
1798 | return result; | |
1799 | } | |
1800 | ||
27932742 MS |
1801 | static int proc_readfd_common(struct file * filp, void * dirent, |
1802 | filldir_t filldir, instantiate_t instantiate) | |
28a6d671 | 1803 | { |
2fddfeef | 1804 | struct dentry *dentry = filp->f_path.dentry; |
28a6d671 EB |
1805 | struct inode *inode = dentry->d_inode; |
1806 | struct task_struct *p = get_proc_task(inode); | |
457c2510 | 1807 | unsigned int fd, ino; |
28a6d671 | 1808 | int retval; |
28a6d671 | 1809 | struct files_struct * files; |
1da177e4 | 1810 | |
28a6d671 EB |
1811 | retval = -ENOENT; |
1812 | if (!p) | |
1813 | goto out_no_task; | |
1814 | retval = 0; | |
28a6d671 EB |
1815 | |
1816 | fd = filp->f_pos; | |
1817 | switch (fd) { | |
1818 | case 0: | |
1819 | if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0) | |
1820 | goto out; | |
1821 | filp->f_pos++; | |
1822 | case 1: | |
1823 | ino = parent_ino(dentry); | |
1824 | if (filldir(dirent, "..", 2, 1, ino, DT_DIR) < 0) | |
1825 | goto out; | |
1826 | filp->f_pos++; | |
1827 | default: | |
1828 | files = get_files_struct(p); | |
1829 | if (!files) | |
1830 | goto out; | |
1831 | rcu_read_lock(); | |
28a6d671 | 1832 | for (fd = filp->f_pos-2; |
9b4f526c | 1833 | fd < files_fdtable(files)->max_fds; |
28a6d671 | 1834 | fd++, filp->f_pos++) { |
27932742 MS |
1835 | char name[PROC_NUMBUF]; |
1836 | int len; | |
28a6d671 EB |
1837 | |
1838 | if (!fcheck_files(files, fd)) | |
1839 | continue; | |
1840 | rcu_read_unlock(); | |
1841 | ||
27932742 MS |
1842 | len = snprintf(name, sizeof(name), "%d", fd); |
1843 | if (proc_fill_cache(filp, dirent, filldir, | |
1844 | name, len, instantiate, | |
1845 | p, &fd) < 0) { | |
28a6d671 EB |
1846 | rcu_read_lock(); |
1847 | break; | |
1848 | } | |
1849 | rcu_read_lock(); | |
1850 | } | |
1851 | rcu_read_unlock(); | |
1852 | put_files_struct(files); | |
1853 | } | |
1854 | out: | |
1855 | put_task_struct(p); | |
1856 | out_no_task: | |
1857 | return retval; | |
1858 | } | |
1859 | ||
27932742 MS |
1860 | static struct dentry *proc_lookupfd(struct inode *dir, struct dentry *dentry, |
1861 | struct nameidata *nd) | |
1862 | { | |
1863 | return proc_lookupfd_common(dir, dentry, proc_fd_instantiate); | |
1864 | } | |
1865 | ||
1866 | static int proc_readfd(struct file *filp, void *dirent, filldir_t filldir) | |
1867 | { | |
1868 | return proc_readfd_common(filp, dirent, filldir, proc_fd_instantiate); | |
1869 | } | |
1870 | ||
1871 | static ssize_t proc_fdinfo_read(struct file *file, char __user *buf, | |
1872 | size_t len, loff_t *ppos) | |
1873 | { | |
1874 | char tmp[PROC_FDINFO_MAX]; | |
3dcd25f3 | 1875 | int err = proc_fd_info(file->f_path.dentry->d_inode, NULL, tmp); |
27932742 MS |
1876 | if (!err) |
1877 | err = simple_read_from_buffer(buf, len, ppos, tmp, strlen(tmp)); | |
1878 | return err; | |
1879 | } | |
1880 | ||
1881 | static const struct file_operations proc_fdinfo_file_operations = { | |
1882 | .open = nonseekable_open, | |
1883 | .read = proc_fdinfo_read, | |
1884 | }; | |
1885 | ||
00977a59 | 1886 | static const struct file_operations proc_fd_operations = { |
28a6d671 EB |
1887 | .read = generic_read_dir, |
1888 | .readdir = proc_readfd, | |
1da177e4 LT |
1889 | }; |
1890 | ||
8948e11f AD |
1891 | /* |
1892 | * /proc/pid/fd needs a special permission handler so that a process can still | |
1893 | * access /proc/self/fd after it has executed a setuid(). | |
1894 | */ | |
e6305c43 | 1895 | static int proc_fd_permission(struct inode *inode, int mask) |
8948e11f AD |
1896 | { |
1897 | int rv; | |
1898 | ||
1899 | rv = generic_permission(inode, mask, NULL); | |
1900 | if (rv == 0) | |
1901 | return 0; | |
1902 | if (task_pid(current) == proc_pid(inode)) | |
1903 | rv = 0; | |
1904 | return rv; | |
1905 | } | |
1906 | ||
1da177e4 LT |
1907 | /* |
1908 | * proc directories can do almost nothing.. | |
1909 | */ | |
c5ef1c42 | 1910 | static const struct inode_operations proc_fd_inode_operations = { |
1da177e4 | 1911 | .lookup = proc_lookupfd, |
8948e11f | 1912 | .permission = proc_fd_permission, |
6d76fa58 | 1913 | .setattr = proc_setattr, |
1da177e4 LT |
1914 | }; |
1915 | ||
27932742 MS |
1916 | static struct dentry *proc_fdinfo_instantiate(struct inode *dir, |
1917 | struct dentry *dentry, struct task_struct *task, const void *ptr) | |
1918 | { | |
1919 | unsigned fd = *(unsigned *)ptr; | |
1920 | struct inode *inode; | |
1921 | struct proc_inode *ei; | |
1922 | struct dentry *error = ERR_PTR(-ENOENT); | |
1923 | ||
1924 | inode = proc_pid_make_inode(dir->i_sb, task); | |
1925 | if (!inode) | |
1926 | goto out; | |
1927 | ei = PROC_I(inode); | |
1928 | ei->fd = fd; | |
1929 | inode->i_mode = S_IFREG | S_IRUSR; | |
1930 | inode->i_fop = &proc_fdinfo_file_operations; | |
1931 | dentry->d_op = &tid_fd_dentry_operations; | |
1932 | d_add(dentry, inode); | |
1933 | /* Close the race of the process dying before we return the dentry */ | |
1934 | if (tid_fd_revalidate(dentry, NULL)) | |
1935 | error = NULL; | |
1936 | ||
1937 | out: | |
1938 | return error; | |
1939 | } | |
1940 | ||
1941 | static struct dentry *proc_lookupfdinfo(struct inode *dir, | |
1942 | struct dentry *dentry, | |
1943 | struct nameidata *nd) | |
1944 | { | |
1945 | return proc_lookupfd_common(dir, dentry, proc_fdinfo_instantiate); | |
1946 | } | |
1947 | ||
1948 | static int proc_readfdinfo(struct file *filp, void *dirent, filldir_t filldir) | |
1949 | { | |
1950 | return proc_readfd_common(filp, dirent, filldir, | |
1951 | proc_fdinfo_instantiate); | |
1952 | } | |
1953 | ||
1954 | static const struct file_operations proc_fdinfo_operations = { | |
1955 | .read = generic_read_dir, | |
1956 | .readdir = proc_readfdinfo, | |
1957 | }; | |
1958 | ||
1959 | /* | |
1960 | * proc directories can do almost nothing.. | |
1961 | */ | |
1962 | static const struct inode_operations proc_fdinfo_inode_operations = { | |
1963 | .lookup = proc_lookupfdinfo, | |
1964 | .setattr = proc_setattr, | |
1965 | }; | |
1966 | ||
1967 | ||
444ceed8 | 1968 | static struct dentry *proc_pident_instantiate(struct inode *dir, |
c5141e6d | 1969 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
444ceed8 | 1970 | { |
c5141e6d | 1971 | const struct pid_entry *p = ptr; |
444ceed8 EB |
1972 | struct inode *inode; |
1973 | struct proc_inode *ei; | |
bd6daba9 | 1974 | struct dentry *error = ERR_PTR(-ENOENT); |
444ceed8 | 1975 | |
61a28784 | 1976 | inode = proc_pid_make_inode(dir->i_sb, task); |
444ceed8 EB |
1977 | if (!inode) |
1978 | goto out; | |
1979 | ||
1980 | ei = PROC_I(inode); | |
1981 | inode->i_mode = p->mode; | |
1982 | if (S_ISDIR(inode->i_mode)) | |
1983 | inode->i_nlink = 2; /* Use getattr to fix if necessary */ | |
1984 | if (p->iop) | |
1985 | inode->i_op = p->iop; | |
1986 | if (p->fop) | |
1987 | inode->i_fop = p->fop; | |
1988 | ei->op = p->op; | |
1989 | dentry->d_op = &pid_dentry_operations; | |
1990 | d_add(dentry, inode); | |
1991 | /* Close the race of the process dying before we return the dentry */ | |
1992 | if (pid_revalidate(dentry, NULL)) | |
1993 | error = NULL; | |
1994 | out: | |
1995 | return error; | |
1996 | } | |
1997 | ||
1da177e4 LT |
1998 | static struct dentry *proc_pident_lookup(struct inode *dir, |
1999 | struct dentry *dentry, | |
c5141e6d | 2000 | const struct pid_entry *ents, |
7bcd6b0e | 2001 | unsigned int nents) |
1da177e4 | 2002 | { |
cd6a3ce9 | 2003 | struct dentry *error; |
99f89551 | 2004 | struct task_struct *task = get_proc_task(dir); |
c5141e6d | 2005 | const struct pid_entry *p, *last; |
1da177e4 | 2006 | |
cd6a3ce9 | 2007 | error = ERR_PTR(-ENOENT); |
1da177e4 | 2008 | |
99f89551 EB |
2009 | if (!task) |
2010 | goto out_no_task; | |
1da177e4 | 2011 | |
20cdc894 EB |
2012 | /* |
2013 | * Yes, it does not scale. And it should not. Don't add | |
2014 | * new entries into /proc/<tgid>/ without very good reasons. | |
2015 | */ | |
7bcd6b0e EB |
2016 | last = &ents[nents - 1]; |
2017 | for (p = ents; p <= last; p++) { | |
1da177e4 LT |
2018 | if (p->len != dentry->d_name.len) |
2019 | continue; | |
2020 | if (!memcmp(dentry->d_name.name, p->name, p->len)) | |
2021 | break; | |
2022 | } | |
7bcd6b0e | 2023 | if (p > last) |
1da177e4 LT |
2024 | goto out; |
2025 | ||
444ceed8 | 2026 | error = proc_pident_instantiate(dir, dentry, task, p); |
1da177e4 | 2027 | out: |
99f89551 EB |
2028 | put_task_struct(task); |
2029 | out_no_task: | |
cd6a3ce9 | 2030 | return error; |
1da177e4 LT |
2031 | } |
2032 | ||
c5141e6d ED |
2033 | static int proc_pident_fill_cache(struct file *filp, void *dirent, |
2034 | filldir_t filldir, struct task_struct *task, const struct pid_entry *p) | |
61a28784 EB |
2035 | { |
2036 | return proc_fill_cache(filp, dirent, filldir, p->name, p->len, | |
2037 | proc_pident_instantiate, task, p); | |
2038 | } | |
2039 | ||
28a6d671 EB |
2040 | static int proc_pident_readdir(struct file *filp, |
2041 | void *dirent, filldir_t filldir, | |
c5141e6d | 2042 | const struct pid_entry *ents, unsigned int nents) |
28a6d671 EB |
2043 | { |
2044 | int i; | |
2fddfeef | 2045 | struct dentry *dentry = filp->f_path.dentry; |
28a6d671 EB |
2046 | struct inode *inode = dentry->d_inode; |
2047 | struct task_struct *task = get_proc_task(inode); | |
c5141e6d | 2048 | const struct pid_entry *p, *last; |
28a6d671 EB |
2049 | ino_t ino; |
2050 | int ret; | |
2051 | ||
2052 | ret = -ENOENT; | |
2053 | if (!task) | |
61a28784 | 2054 | goto out_no_task; |
28a6d671 EB |
2055 | |
2056 | ret = 0; | |
28a6d671 EB |
2057 | i = filp->f_pos; |
2058 | switch (i) { | |
2059 | case 0: | |
2060 | ino = inode->i_ino; | |
2061 | if (filldir(dirent, ".", 1, i, ino, DT_DIR) < 0) | |
2062 | goto out; | |
2063 | i++; | |
2064 | filp->f_pos++; | |
2065 | /* fall through */ | |
2066 | case 1: | |
2067 | ino = parent_ino(dentry); | |
2068 | if (filldir(dirent, "..", 2, i, ino, DT_DIR) < 0) | |
2069 | goto out; | |
2070 | i++; | |
2071 | filp->f_pos++; | |
2072 | /* fall through */ | |
2073 | default: | |
2074 | i -= 2; | |
2075 | if (i >= nents) { | |
2076 | ret = 1; | |
2077 | goto out; | |
2078 | } | |
2079 | p = ents + i; | |
7bcd6b0e EB |
2080 | last = &ents[nents - 1]; |
2081 | while (p <= last) { | |
61a28784 | 2082 | if (proc_pident_fill_cache(filp, dirent, filldir, task, p) < 0) |
28a6d671 EB |
2083 | goto out; |
2084 | filp->f_pos++; | |
2085 | p++; | |
2086 | } | |
2087 | } | |
2088 | ||
2089 | ret = 1; | |
2090 | out: | |
61a28784 EB |
2091 | put_task_struct(task); |
2092 | out_no_task: | |
28a6d671 | 2093 | return ret; |
1da177e4 LT |
2094 | } |
2095 | ||
28a6d671 EB |
2096 | #ifdef CONFIG_SECURITY |
2097 | static ssize_t proc_pid_attr_read(struct file * file, char __user * buf, | |
2098 | size_t count, loff_t *ppos) | |
2099 | { | |
2fddfeef | 2100 | struct inode * inode = file->f_path.dentry->d_inode; |
04ff9708 | 2101 | char *p = NULL; |
28a6d671 EB |
2102 | ssize_t length; |
2103 | struct task_struct *task = get_proc_task(inode); | |
2104 | ||
28a6d671 | 2105 | if (!task) |
04ff9708 | 2106 | return -ESRCH; |
28a6d671 EB |
2107 | |
2108 | length = security_getprocattr(task, | |
2fddfeef | 2109 | (char*)file->f_path.dentry->d_name.name, |
04ff9708 | 2110 | &p); |
28a6d671 | 2111 | put_task_struct(task); |
04ff9708 AV |
2112 | if (length > 0) |
2113 | length = simple_read_from_buffer(buf, count, ppos, p, length); | |
2114 | kfree(p); | |
28a6d671 | 2115 | return length; |
1da177e4 LT |
2116 | } |
2117 | ||
28a6d671 EB |
2118 | static ssize_t proc_pid_attr_write(struct file * file, const char __user * buf, |
2119 | size_t count, loff_t *ppos) | |
2120 | { | |
2fddfeef | 2121 | struct inode * inode = file->f_path.dentry->d_inode; |
28a6d671 EB |
2122 | char *page; |
2123 | ssize_t length; | |
2124 | struct task_struct *task = get_proc_task(inode); | |
2125 | ||
2126 | length = -ESRCH; | |
2127 | if (!task) | |
2128 | goto out_no_task; | |
2129 | if (count > PAGE_SIZE) | |
2130 | count = PAGE_SIZE; | |
2131 | ||
2132 | /* No partial writes. */ | |
2133 | length = -EINVAL; | |
2134 | if (*ppos != 0) | |
2135 | goto out; | |
2136 | ||
2137 | length = -ENOMEM; | |
e12ba74d | 2138 | page = (char*)__get_free_page(GFP_TEMPORARY); |
28a6d671 EB |
2139 | if (!page) |
2140 | goto out; | |
2141 | ||
2142 | length = -EFAULT; | |
2143 | if (copy_from_user(page, buf, count)) | |
2144 | goto out_free; | |
2145 | ||
107db7c7 DH |
2146 | /* Guard against adverse ptrace interaction */ |
2147 | length = mutex_lock_interruptible(&task->cred_guard_mutex); | |
2148 | if (length < 0) | |
2149 | goto out_free; | |
2150 | ||
28a6d671 | 2151 | length = security_setprocattr(task, |
2fddfeef | 2152 | (char*)file->f_path.dentry->d_name.name, |
28a6d671 | 2153 | (void*)page, count); |
107db7c7 | 2154 | mutex_unlock(&task->cred_guard_mutex); |
28a6d671 EB |
2155 | out_free: |
2156 | free_page((unsigned long) page); | |
2157 | out: | |
2158 | put_task_struct(task); | |
2159 | out_no_task: | |
2160 | return length; | |
2161 | } | |
2162 | ||
00977a59 | 2163 | static const struct file_operations proc_pid_attr_operations = { |
28a6d671 EB |
2164 | .read = proc_pid_attr_read, |
2165 | .write = proc_pid_attr_write, | |
2166 | }; | |
2167 | ||
c5141e6d | 2168 | static const struct pid_entry attr_dir_stuff[] = { |
631f9c18 AD |
2169 | REG("current", S_IRUGO|S_IWUGO, proc_pid_attr_operations), |
2170 | REG("prev", S_IRUGO, proc_pid_attr_operations), | |
2171 | REG("exec", S_IRUGO|S_IWUGO, proc_pid_attr_operations), | |
2172 | REG("fscreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations), | |
2173 | REG("keycreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations), | |
2174 | REG("sockcreate", S_IRUGO|S_IWUGO, proc_pid_attr_operations), | |
28a6d671 EB |
2175 | }; |
2176 | ||
72d9dcfc | 2177 | static int proc_attr_dir_readdir(struct file * filp, |
28a6d671 EB |
2178 | void * dirent, filldir_t filldir) |
2179 | { | |
2180 | return proc_pident_readdir(filp,dirent,filldir, | |
72d9dcfc | 2181 | attr_dir_stuff,ARRAY_SIZE(attr_dir_stuff)); |
28a6d671 EB |
2182 | } |
2183 | ||
00977a59 | 2184 | static const struct file_operations proc_attr_dir_operations = { |
1da177e4 | 2185 | .read = generic_read_dir, |
72d9dcfc | 2186 | .readdir = proc_attr_dir_readdir, |
1da177e4 LT |
2187 | }; |
2188 | ||
72d9dcfc | 2189 | static struct dentry *proc_attr_dir_lookup(struct inode *dir, |
28a6d671 EB |
2190 | struct dentry *dentry, struct nameidata *nd) |
2191 | { | |
7bcd6b0e EB |
2192 | return proc_pident_lookup(dir, dentry, |
2193 | attr_dir_stuff, ARRAY_SIZE(attr_dir_stuff)); | |
28a6d671 EB |
2194 | } |
2195 | ||
c5ef1c42 | 2196 | static const struct inode_operations proc_attr_dir_inode_operations = { |
72d9dcfc | 2197 | .lookup = proc_attr_dir_lookup, |
99f89551 | 2198 | .getattr = pid_getattr, |
6d76fa58 | 2199 | .setattr = proc_setattr, |
1da177e4 LT |
2200 | }; |
2201 | ||
28a6d671 EB |
2202 | #endif |
2203 | ||
3cb4a0bb KH |
2204 | #if defined(USE_ELF_CORE_DUMP) && defined(CONFIG_ELF_CORE) |
2205 | static ssize_t proc_coredump_filter_read(struct file *file, char __user *buf, | |
2206 | size_t count, loff_t *ppos) | |
2207 | { | |
2208 | struct task_struct *task = get_proc_task(file->f_dentry->d_inode); | |
2209 | struct mm_struct *mm; | |
2210 | char buffer[PROC_NUMBUF]; | |
2211 | size_t len; | |
2212 | int ret; | |
2213 | ||
2214 | if (!task) | |
2215 | return -ESRCH; | |
2216 | ||
2217 | ret = 0; | |
2218 | mm = get_task_mm(task); | |
2219 | if (mm) { | |
2220 | len = snprintf(buffer, sizeof(buffer), "%08lx\n", | |
2221 | ((mm->flags & MMF_DUMP_FILTER_MASK) >> | |
2222 | MMF_DUMP_FILTER_SHIFT)); | |
2223 | mmput(mm); | |
2224 | ret = simple_read_from_buffer(buf, count, ppos, buffer, len); | |
2225 | } | |
2226 | ||
2227 | put_task_struct(task); | |
2228 | ||
2229 | return ret; | |
2230 | } | |
2231 | ||
2232 | static ssize_t proc_coredump_filter_write(struct file *file, | |
2233 | const char __user *buf, | |
2234 | size_t count, | |
2235 | loff_t *ppos) | |
2236 | { | |
2237 | struct task_struct *task; | |
2238 | struct mm_struct *mm; | |
2239 | char buffer[PROC_NUMBUF], *end; | |
2240 | unsigned int val; | |
2241 | int ret; | |
2242 | int i; | |
2243 | unsigned long mask; | |
2244 | ||
2245 | ret = -EFAULT; | |
2246 | memset(buffer, 0, sizeof(buffer)); | |
2247 | if (count > sizeof(buffer) - 1) | |
2248 | count = sizeof(buffer) - 1; | |
2249 | if (copy_from_user(buffer, buf, count)) | |
2250 | goto out_no_task; | |
2251 | ||
2252 | ret = -EINVAL; | |
2253 | val = (unsigned int)simple_strtoul(buffer, &end, 0); | |
2254 | if (*end == '\n') | |
2255 | end++; | |
2256 | if (end - buffer == 0) | |
2257 | goto out_no_task; | |
2258 | ||
2259 | ret = -ESRCH; | |
2260 | task = get_proc_task(file->f_dentry->d_inode); | |
2261 | if (!task) | |
2262 | goto out_no_task; | |
2263 | ||
2264 | ret = end - buffer; | |
2265 | mm = get_task_mm(task); | |
2266 | if (!mm) | |
2267 | goto out_no_mm; | |
2268 | ||
2269 | for (i = 0, mask = 1; i < MMF_DUMP_FILTER_BITS; i++, mask <<= 1) { | |
2270 | if (val & mask) | |
2271 | set_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags); | |
2272 | else | |
2273 | clear_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags); | |
2274 | } | |
2275 | ||
2276 | mmput(mm); | |
2277 | out_no_mm: | |
2278 | put_task_struct(task); | |
2279 | out_no_task: | |
2280 | return ret; | |
2281 | } | |
2282 | ||
2283 | static const struct file_operations proc_coredump_filter_operations = { | |
2284 | .read = proc_coredump_filter_read, | |
2285 | .write = proc_coredump_filter_write, | |
2286 | }; | |
2287 | #endif | |
2288 | ||
28a6d671 EB |
2289 | /* |
2290 | * /proc/self: | |
2291 | */ | |
2292 | static int proc_self_readlink(struct dentry *dentry, char __user *buffer, | |
2293 | int buflen) | |
2294 | { | |
488e5bc4 | 2295 | struct pid_namespace *ns = dentry->d_sb->s_fs_info; |
b55fcb22 | 2296 | pid_t tgid = task_tgid_nr_ns(current, ns); |
28a6d671 | 2297 | char tmp[PROC_NUMBUF]; |
b55fcb22 | 2298 | if (!tgid) |
488e5bc4 | 2299 | return -ENOENT; |
b55fcb22 | 2300 | sprintf(tmp, "%d", tgid); |
28a6d671 EB |
2301 | return vfs_readlink(dentry,buffer,buflen,tmp); |
2302 | } | |
2303 | ||
2304 | static void *proc_self_follow_link(struct dentry *dentry, struct nameidata *nd) | |
2305 | { | |
488e5bc4 | 2306 | struct pid_namespace *ns = dentry->d_sb->s_fs_info; |
b55fcb22 | 2307 | pid_t tgid = task_tgid_nr_ns(current, ns); |
28a6d671 | 2308 | char tmp[PROC_NUMBUF]; |
b55fcb22 | 2309 | if (!tgid) |
488e5bc4 | 2310 | return ERR_PTR(-ENOENT); |
b55fcb22 | 2311 | sprintf(tmp, "%d", task_tgid_nr_ns(current, ns)); |
28a6d671 EB |
2312 | return ERR_PTR(vfs_follow_link(nd,tmp)); |
2313 | } | |
2314 | ||
c5ef1c42 | 2315 | static const struct inode_operations proc_self_inode_operations = { |
28a6d671 EB |
2316 | .readlink = proc_self_readlink, |
2317 | .follow_link = proc_self_follow_link, | |
2318 | }; | |
2319 | ||
801199ce EB |
2320 | /* |
2321 | * proc base | |
2322 | * | |
2323 | * These are the directory entries in the root directory of /proc | |
2324 | * that properly belong to the /proc filesystem, as they describe | |
2325 | * describe something that is process related. | |
2326 | */ | |
c5141e6d | 2327 | static const struct pid_entry proc_base_stuff[] = { |
61a28784 | 2328 | NOD("self", S_IFLNK|S_IRWXUGO, |
801199ce | 2329 | &proc_self_inode_operations, NULL, {}), |
801199ce EB |
2330 | }; |
2331 | ||
2332 | /* | |
2333 | * Exceptional case: normally we are not allowed to unhash a busy | |
2334 | * directory. In this case, however, we can do it - no aliasing problems | |
2335 | * due to the way we treat inodes. | |
2336 | */ | |
2337 | static int proc_base_revalidate(struct dentry *dentry, struct nameidata *nd) | |
2338 | { | |
2339 | struct inode *inode = dentry->d_inode; | |
2340 | struct task_struct *task = get_proc_task(inode); | |
2341 | if (task) { | |
2342 | put_task_struct(task); | |
2343 | return 1; | |
2344 | } | |
2345 | d_drop(dentry); | |
2346 | return 0; | |
2347 | } | |
2348 | ||
d72f71eb | 2349 | static const struct dentry_operations proc_base_dentry_operations = |
801199ce EB |
2350 | { |
2351 | .d_revalidate = proc_base_revalidate, | |
2352 | .d_delete = pid_delete_dentry, | |
2353 | }; | |
2354 | ||
444ceed8 | 2355 | static struct dentry *proc_base_instantiate(struct inode *dir, |
c5141e6d | 2356 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
801199ce | 2357 | { |
c5141e6d | 2358 | const struct pid_entry *p = ptr; |
801199ce | 2359 | struct inode *inode; |
801199ce | 2360 | struct proc_inode *ei; |
444ceed8 | 2361 | struct dentry *error = ERR_PTR(-EINVAL); |
801199ce EB |
2362 | |
2363 | /* Allocate the inode */ | |
2364 | error = ERR_PTR(-ENOMEM); | |
2365 | inode = new_inode(dir->i_sb); | |
2366 | if (!inode) | |
2367 | goto out; | |
2368 | ||
2369 | /* Initialize the inode */ | |
2370 | ei = PROC_I(inode); | |
2371 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; | |
801199ce EB |
2372 | |
2373 | /* | |
2374 | * grab the reference to the task. | |
2375 | */ | |
1a657f78 | 2376 | ei->pid = get_task_pid(task, PIDTYPE_PID); |
801199ce EB |
2377 | if (!ei->pid) |
2378 | goto out_iput; | |
2379 | ||
801199ce EB |
2380 | inode->i_mode = p->mode; |
2381 | if (S_ISDIR(inode->i_mode)) | |
2382 | inode->i_nlink = 2; | |
2383 | if (S_ISLNK(inode->i_mode)) | |
2384 | inode->i_size = 64; | |
2385 | if (p->iop) | |
2386 | inode->i_op = p->iop; | |
2387 | if (p->fop) | |
2388 | inode->i_fop = p->fop; | |
2389 | ei->op = p->op; | |
2390 | dentry->d_op = &proc_base_dentry_operations; | |
2391 | d_add(dentry, inode); | |
2392 | error = NULL; | |
2393 | out: | |
801199ce EB |
2394 | return error; |
2395 | out_iput: | |
2396 | iput(inode); | |
2397 | goto out; | |
2398 | } | |
2399 | ||
444ceed8 EB |
2400 | static struct dentry *proc_base_lookup(struct inode *dir, struct dentry *dentry) |
2401 | { | |
2402 | struct dentry *error; | |
2403 | struct task_struct *task = get_proc_task(dir); | |
c5141e6d | 2404 | const struct pid_entry *p, *last; |
444ceed8 EB |
2405 | |
2406 | error = ERR_PTR(-ENOENT); | |
2407 | ||
2408 | if (!task) | |
2409 | goto out_no_task; | |
2410 | ||
2411 | /* Lookup the directory entry */ | |
7bcd6b0e EB |
2412 | last = &proc_base_stuff[ARRAY_SIZE(proc_base_stuff) - 1]; |
2413 | for (p = proc_base_stuff; p <= last; p++) { | |
444ceed8 EB |
2414 | if (p->len != dentry->d_name.len) |
2415 | continue; | |
2416 | if (!memcmp(dentry->d_name.name, p->name, p->len)) | |
2417 | break; | |
2418 | } | |
7bcd6b0e | 2419 | if (p > last) |
444ceed8 EB |
2420 | goto out; |
2421 | ||
2422 | error = proc_base_instantiate(dir, dentry, task, p); | |
2423 | ||
2424 | out: | |
2425 | put_task_struct(task); | |
2426 | out_no_task: | |
2427 | return error; | |
2428 | } | |
2429 | ||
c5141e6d ED |
2430 | static int proc_base_fill_cache(struct file *filp, void *dirent, |
2431 | filldir_t filldir, struct task_struct *task, const struct pid_entry *p) | |
61a28784 EB |
2432 | { |
2433 | return proc_fill_cache(filp, dirent, filldir, p->name, p->len, | |
2434 | proc_base_instantiate, task, p); | |
2435 | } | |
2436 | ||
aba76fdb | 2437 | #ifdef CONFIG_TASK_IO_ACCOUNTING |
297c5d92 AR |
2438 | static int do_io_accounting(struct task_struct *task, char *buffer, int whole) |
2439 | { | |
940389b8 | 2440 | struct task_io_accounting acct = task->ioac; |
5995477a AR |
2441 | unsigned long flags; |
2442 | ||
2443 | if (whole && lock_task_sighand(task, &flags)) { | |
2444 | struct task_struct *t = task; | |
2445 | ||
2446 | task_io_accounting_add(&acct, &task->signal->ioac); | |
2447 | while_each_thread(task, t) | |
2448 | task_io_accounting_add(&acct, &t->ioac); | |
2449 | ||
2450 | unlock_task_sighand(task, &flags); | |
297c5d92 | 2451 | } |
aba76fdb AM |
2452 | return sprintf(buffer, |
2453 | "rchar: %llu\n" | |
2454 | "wchar: %llu\n" | |
2455 | "syscr: %llu\n" | |
2456 | "syscw: %llu\n" | |
2457 | "read_bytes: %llu\n" | |
2458 | "write_bytes: %llu\n" | |
2459 | "cancelled_write_bytes: %llu\n", | |
7c44319d AB |
2460 | (unsigned long long)acct.rchar, |
2461 | (unsigned long long)acct.wchar, | |
2462 | (unsigned long long)acct.syscr, | |
2463 | (unsigned long long)acct.syscw, | |
2464 | (unsigned long long)acct.read_bytes, | |
2465 | (unsigned long long)acct.write_bytes, | |
2466 | (unsigned long long)acct.cancelled_write_bytes); | |
297c5d92 AR |
2467 | } |
2468 | ||
2469 | static int proc_tid_io_accounting(struct task_struct *task, char *buffer) | |
2470 | { | |
2471 | return do_io_accounting(task, buffer, 0); | |
aba76fdb | 2472 | } |
297c5d92 AR |
2473 | |
2474 | static int proc_tgid_io_accounting(struct task_struct *task, char *buffer) | |
2475 | { | |
2476 | return do_io_accounting(task, buffer, 1); | |
2477 | } | |
2478 | #endif /* CONFIG_TASK_IO_ACCOUNTING */ | |
aba76fdb | 2479 | |
47830723 KC |
2480 | static int proc_pid_personality(struct seq_file *m, struct pid_namespace *ns, |
2481 | struct pid *pid, struct task_struct *task) | |
2482 | { | |
2483 | seq_printf(m, "%08x\n", task->personality); | |
2484 | return 0; | |
2485 | } | |
2486 | ||
28a6d671 EB |
2487 | /* |
2488 | * Thread groups | |
2489 | */ | |
00977a59 | 2490 | static const struct file_operations proc_task_operations; |
c5ef1c42 | 2491 | static const struct inode_operations proc_task_inode_operations; |
20cdc894 | 2492 | |
c5141e6d | 2493 | static const struct pid_entry tgid_base_stuff[] = { |
631f9c18 AD |
2494 | DIR("task", S_IRUGO|S_IXUGO, proc_task_inode_operations, proc_task_operations), |
2495 | DIR("fd", S_IRUSR|S_IXUSR, proc_fd_inode_operations, proc_fd_operations), | |
2496 | DIR("fdinfo", S_IRUSR|S_IXUSR, proc_fdinfo_inode_operations, proc_fdinfo_operations), | |
b2211a36 | 2497 | #ifdef CONFIG_NET |
631f9c18 | 2498 | DIR("net", S_IRUGO|S_IXUGO, proc_net_inode_operations, proc_net_operations), |
b2211a36 | 2499 | #endif |
631f9c18 AD |
2500 | REG("environ", S_IRUSR, proc_environ_operations), |
2501 | INF("auxv", S_IRUSR, proc_pid_auxv), | |
2502 | ONE("status", S_IRUGO, proc_pid_status), | |
2503 | ONE("personality", S_IRUSR, proc_pid_personality), | |
2504 | INF("limits", S_IRUSR, proc_pid_limits), | |
43ae34cb | 2505 | #ifdef CONFIG_SCHED_DEBUG |
631f9c18 | 2506 | REG("sched", S_IRUGO|S_IWUSR, proc_pid_sched_operations), |
ebcb6734 RM |
2507 | #endif |
2508 | #ifdef CONFIG_HAVE_ARCH_TRACEHOOK | |
631f9c18 | 2509 | INF("syscall", S_IRUSR, proc_pid_syscall), |
43ae34cb | 2510 | #endif |
631f9c18 AD |
2511 | INF("cmdline", S_IRUGO, proc_pid_cmdline), |
2512 | ONE("stat", S_IRUGO, proc_tgid_stat), | |
2513 | ONE("statm", S_IRUGO, proc_pid_statm), | |
2514 | REG("maps", S_IRUGO, proc_maps_operations), | |
28a6d671 | 2515 | #ifdef CONFIG_NUMA |
631f9c18 | 2516 | REG("numa_maps", S_IRUGO, proc_numa_maps_operations), |
28a6d671 | 2517 | #endif |
631f9c18 AD |
2518 | REG("mem", S_IRUSR|S_IWUSR, proc_mem_operations), |
2519 | LNK("cwd", proc_cwd_link), | |
2520 | LNK("root", proc_root_link), | |
2521 | LNK("exe", proc_exe_link), | |
2522 | REG("mounts", S_IRUGO, proc_mounts_operations), | |
2523 | REG("mountinfo", S_IRUGO, proc_mountinfo_operations), | |
2524 | REG("mountstats", S_IRUSR, proc_mountstats_operations), | |
1e883281 | 2525 | #ifdef CONFIG_PROC_PAGE_MONITOR |
631f9c18 AD |
2526 | REG("clear_refs", S_IWUSR, proc_clear_refs_operations), |
2527 | REG("smaps", S_IRUGO, proc_smaps_operations), | |
2528 | REG("pagemap", S_IRUSR, proc_pagemap_operations), | |
28a6d671 EB |
2529 | #endif |
2530 | #ifdef CONFIG_SECURITY | |
631f9c18 | 2531 | DIR("attr", S_IRUGO|S_IXUGO, proc_attr_dir_inode_operations, proc_attr_dir_operations), |
28a6d671 EB |
2532 | #endif |
2533 | #ifdef CONFIG_KALLSYMS | |
631f9c18 | 2534 | INF("wchan", S_IRUGO, proc_pid_wchan), |
28a6d671 | 2535 | #endif |
2ec220e2 KC |
2536 | #ifdef CONFIG_STACKTRACE |
2537 | ONE("stack", S_IRUSR, proc_pid_stack), | |
28a6d671 EB |
2538 | #endif |
2539 | #ifdef CONFIG_SCHEDSTATS | |
631f9c18 | 2540 | INF("schedstat", S_IRUGO, proc_pid_schedstat), |
28a6d671 | 2541 | #endif |
9745512c | 2542 | #ifdef CONFIG_LATENCYTOP |
631f9c18 | 2543 | REG("latency", S_IRUGO, proc_lstats_operations), |
9745512c | 2544 | #endif |
8793d854 | 2545 | #ifdef CONFIG_PROC_PID_CPUSET |
631f9c18 | 2546 | REG("cpuset", S_IRUGO, proc_cpuset_operations), |
a424316c PM |
2547 | #endif |
2548 | #ifdef CONFIG_CGROUPS | |
631f9c18 | 2549 | REG("cgroup", S_IRUGO, proc_cgroup_operations), |
28a6d671 | 2550 | #endif |
631f9c18 AD |
2551 | INF("oom_score", S_IRUGO, proc_oom_score), |
2552 | REG("oom_adj", S_IRUGO|S_IWUSR, proc_oom_adjust_operations), | |
28a6d671 | 2553 | #ifdef CONFIG_AUDITSYSCALL |
631f9c18 AD |
2554 | REG("loginuid", S_IWUSR|S_IRUGO, proc_loginuid_operations), |
2555 | REG("sessionid", S_IRUGO, proc_sessionid_operations), | |
28a6d671 | 2556 | #endif |
f4f154fd | 2557 | #ifdef CONFIG_FAULT_INJECTION |
631f9c18 | 2558 | REG("make-it-fail", S_IRUGO|S_IWUSR, proc_fault_inject_operations), |
f4f154fd | 2559 | #endif |
3cb4a0bb | 2560 | #if defined(USE_ELF_CORE_DUMP) && defined(CONFIG_ELF_CORE) |
631f9c18 | 2561 | REG("coredump_filter", S_IRUGO|S_IWUSR, proc_coredump_filter_operations), |
3cb4a0bb | 2562 | #endif |
aba76fdb | 2563 | #ifdef CONFIG_TASK_IO_ACCOUNTING |
631f9c18 | 2564 | INF("io", S_IRUGO, proc_tgid_io_accounting), |
aba76fdb | 2565 | #endif |
28a6d671 | 2566 | }; |
1da177e4 | 2567 | |
28a6d671 | 2568 | static int proc_tgid_base_readdir(struct file * filp, |
1da177e4 LT |
2569 | void * dirent, filldir_t filldir) |
2570 | { | |
2571 | return proc_pident_readdir(filp,dirent,filldir, | |
28a6d671 | 2572 | tgid_base_stuff,ARRAY_SIZE(tgid_base_stuff)); |
1da177e4 LT |
2573 | } |
2574 | ||
00977a59 | 2575 | static const struct file_operations proc_tgid_base_operations = { |
1da177e4 | 2576 | .read = generic_read_dir, |
28a6d671 | 2577 | .readdir = proc_tgid_base_readdir, |
1da177e4 LT |
2578 | }; |
2579 | ||
28a6d671 | 2580 | static struct dentry *proc_tgid_base_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd){ |
7bcd6b0e EB |
2581 | return proc_pident_lookup(dir, dentry, |
2582 | tgid_base_stuff, ARRAY_SIZE(tgid_base_stuff)); | |
1da177e4 LT |
2583 | } |
2584 | ||
c5ef1c42 | 2585 | static const struct inode_operations proc_tgid_base_inode_operations = { |
28a6d671 | 2586 | .lookup = proc_tgid_base_lookup, |
99f89551 | 2587 | .getattr = pid_getattr, |
6d76fa58 | 2588 | .setattr = proc_setattr, |
1da177e4 | 2589 | }; |
1da177e4 | 2590 | |
60347f67 | 2591 | static void proc_flush_task_mnt(struct vfsmount *mnt, pid_t pid, pid_t tgid) |
1da177e4 | 2592 | { |
48e6484d | 2593 | struct dentry *dentry, *leader, *dir; |
8578cea7 | 2594 | char buf[PROC_NUMBUF]; |
48e6484d EB |
2595 | struct qstr name; |
2596 | ||
2597 | name.name = buf; | |
60347f67 PE |
2598 | name.len = snprintf(buf, sizeof(buf), "%d", pid); |
2599 | dentry = d_hash_and_lookup(mnt->mnt_root, &name); | |
48e6484d | 2600 | if (dentry) { |
7766755a AA |
2601 | if (!(current->flags & PF_EXITING)) |
2602 | shrink_dcache_parent(dentry); | |
48e6484d EB |
2603 | d_drop(dentry); |
2604 | dput(dentry); | |
2605 | } | |
1da177e4 | 2606 | |
60347f67 | 2607 | if (tgid == 0) |
48e6484d | 2608 | goto out; |
1da177e4 | 2609 | |
48e6484d | 2610 | name.name = buf; |
60347f67 PE |
2611 | name.len = snprintf(buf, sizeof(buf), "%d", tgid); |
2612 | leader = d_hash_and_lookup(mnt->mnt_root, &name); | |
48e6484d EB |
2613 | if (!leader) |
2614 | goto out; | |
1da177e4 | 2615 | |
48e6484d EB |
2616 | name.name = "task"; |
2617 | name.len = strlen(name.name); | |
2618 | dir = d_hash_and_lookup(leader, &name); | |
2619 | if (!dir) | |
2620 | goto out_put_leader; | |
2621 | ||
2622 | name.name = buf; | |
60347f67 | 2623 | name.len = snprintf(buf, sizeof(buf), "%d", pid); |
48e6484d EB |
2624 | dentry = d_hash_and_lookup(dir, &name); |
2625 | if (dentry) { | |
2626 | shrink_dcache_parent(dentry); | |
2627 | d_drop(dentry); | |
2628 | dput(dentry); | |
1da177e4 | 2629 | } |
48e6484d EB |
2630 | |
2631 | dput(dir); | |
2632 | out_put_leader: | |
2633 | dput(leader); | |
2634 | out: | |
2635 | return; | |
1da177e4 LT |
2636 | } |
2637 | ||
0895e91d RD |
2638 | /** |
2639 | * proc_flush_task - Remove dcache entries for @task from the /proc dcache. | |
2640 | * @task: task that should be flushed. | |
2641 | * | |
2642 | * When flushing dentries from proc, one needs to flush them from global | |
60347f67 | 2643 | * proc (proc_mnt) and from all the namespaces' procs this task was seen |
0895e91d RD |
2644 | * in. This call is supposed to do all of this job. |
2645 | * | |
2646 | * Looks in the dcache for | |
2647 | * /proc/@pid | |
2648 | * /proc/@tgid/task/@pid | |
2649 | * if either directory is present flushes it and all of it'ts children | |
2650 | * from the dcache. | |
2651 | * | |
2652 | * It is safe and reasonable to cache /proc entries for a task until | |
2653 | * that task exits. After that they just clog up the dcache with | |
2654 | * useless entries, possibly causing useful dcache entries to be | |
2655 | * flushed instead. This routine is proved to flush those useless | |
2656 | * dcache entries at process exit time. | |
2657 | * | |
2658 | * NOTE: This routine is just an optimization so it does not guarantee | |
2659 | * that no dcache entries will exist at process exit time it | |
2660 | * just makes it very unlikely that any will persist. | |
60347f67 PE |
2661 | */ |
2662 | ||
2663 | void proc_flush_task(struct task_struct *task) | |
2664 | { | |
9fcc2d15 EB |
2665 | int i; |
2666 | struct pid *pid, *tgid = NULL; | |
130f77ec PE |
2667 | struct upid *upid; |
2668 | ||
130f77ec | 2669 | pid = task_pid(task); |
9fcc2d15 EB |
2670 | if (thread_group_leader(task)) |
2671 | tgid = task_tgid(task); | |
130f77ec | 2672 | |
9fcc2d15 | 2673 | for (i = 0; i <= pid->level; i++) { |
130f77ec PE |
2674 | upid = &pid->numbers[i]; |
2675 | proc_flush_task_mnt(upid->ns->proc_mnt, upid->nr, | |
9fcc2d15 | 2676 | tgid ? tgid->numbers[i].nr : 0); |
130f77ec | 2677 | } |
6f4e6433 PE |
2678 | |
2679 | upid = &pid->numbers[pid->level]; | |
2680 | if (upid->nr == 1) | |
2681 | pid_ns_release_proc(upid->ns); | |
60347f67 PE |
2682 | } |
2683 | ||
9711ef99 AB |
2684 | static struct dentry *proc_pid_instantiate(struct inode *dir, |
2685 | struct dentry * dentry, | |
c5141e6d | 2686 | struct task_struct *task, const void *ptr) |
444ceed8 EB |
2687 | { |
2688 | struct dentry *error = ERR_PTR(-ENOENT); | |
2689 | struct inode *inode; | |
2690 | ||
61a28784 | 2691 | inode = proc_pid_make_inode(dir->i_sb, task); |
444ceed8 EB |
2692 | if (!inode) |
2693 | goto out; | |
2694 | ||
2695 | inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO; | |
2696 | inode->i_op = &proc_tgid_base_inode_operations; | |
2697 | inode->i_fop = &proc_tgid_base_operations; | |
2698 | inode->i_flags|=S_IMMUTABLE; | |
aed54175 VN |
2699 | |
2700 | inode->i_nlink = 2 + pid_entry_count_dirs(tgid_base_stuff, | |
2701 | ARRAY_SIZE(tgid_base_stuff)); | |
444ceed8 EB |
2702 | |
2703 | dentry->d_op = &pid_dentry_operations; | |
2704 | ||
2705 | d_add(dentry, inode); | |
2706 | /* Close the race of the process dying before we return the dentry */ | |
2707 | if (pid_revalidate(dentry, NULL)) | |
2708 | error = NULL; | |
2709 | out: | |
2710 | return error; | |
2711 | } | |
2712 | ||
1da177e4 LT |
2713 | struct dentry *proc_pid_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd) |
2714 | { | |
cd6a3ce9 | 2715 | struct dentry *result = ERR_PTR(-ENOENT); |
1da177e4 | 2716 | struct task_struct *task; |
1da177e4 | 2717 | unsigned tgid; |
b488893a | 2718 | struct pid_namespace *ns; |
1da177e4 | 2719 | |
801199ce EB |
2720 | result = proc_base_lookup(dir, dentry); |
2721 | if (!IS_ERR(result) || PTR_ERR(result) != -ENOENT) | |
2722 | goto out; | |
2723 | ||
1da177e4 LT |
2724 | tgid = name_to_int(dentry); |
2725 | if (tgid == ~0U) | |
2726 | goto out; | |
2727 | ||
b488893a | 2728 | ns = dentry->d_sb->s_fs_info; |
de758734 | 2729 | rcu_read_lock(); |
b488893a | 2730 | task = find_task_by_pid_ns(tgid, ns); |
1da177e4 LT |
2731 | if (task) |
2732 | get_task_struct(task); | |
de758734 | 2733 | rcu_read_unlock(); |
1da177e4 LT |
2734 | if (!task) |
2735 | goto out; | |
2736 | ||
444ceed8 | 2737 | result = proc_pid_instantiate(dir, dentry, task, NULL); |
1da177e4 | 2738 | put_task_struct(task); |
1da177e4 | 2739 | out: |
cd6a3ce9 | 2740 | return result; |
1da177e4 LT |
2741 | } |
2742 | ||
1da177e4 | 2743 | /* |
0804ef4b | 2744 | * Find the first task with tgid >= tgid |
0bc58a91 | 2745 | * |
1da177e4 | 2746 | */ |
19fd4bb2 EB |
2747 | struct tgid_iter { |
2748 | unsigned int tgid; | |
0804ef4b | 2749 | struct task_struct *task; |
19fd4bb2 EB |
2750 | }; |
2751 | static struct tgid_iter next_tgid(struct pid_namespace *ns, struct tgid_iter iter) | |
2752 | { | |
0804ef4b | 2753 | struct pid *pid; |
1da177e4 | 2754 | |
19fd4bb2 EB |
2755 | if (iter.task) |
2756 | put_task_struct(iter.task); | |
454cc105 | 2757 | rcu_read_lock(); |
0804ef4b | 2758 | retry: |
19fd4bb2 EB |
2759 | iter.task = NULL; |
2760 | pid = find_ge_pid(iter.tgid, ns); | |
0804ef4b | 2761 | if (pid) { |
19fd4bb2 EB |
2762 | iter.tgid = pid_nr_ns(pid, ns); |
2763 | iter.task = pid_task(pid, PIDTYPE_PID); | |
0804ef4b EB |
2764 | /* What we to know is if the pid we have find is the |
2765 | * pid of a thread_group_leader. Testing for task | |
2766 | * being a thread_group_leader is the obvious thing | |
2767 | * todo but there is a window when it fails, due to | |
2768 | * the pid transfer logic in de_thread. | |
2769 | * | |
2770 | * So we perform the straight forward test of seeing | |
2771 | * if the pid we have found is the pid of a thread | |
2772 | * group leader, and don't worry if the task we have | |
2773 | * found doesn't happen to be a thread group leader. | |
2774 | * As we don't care in the case of readdir. | |
2775 | */ | |
19fd4bb2 EB |
2776 | if (!iter.task || !has_group_leader_pid(iter.task)) { |
2777 | iter.tgid += 1; | |
0804ef4b | 2778 | goto retry; |
19fd4bb2 EB |
2779 | } |
2780 | get_task_struct(iter.task); | |
0bc58a91 | 2781 | } |
454cc105 | 2782 | rcu_read_unlock(); |
19fd4bb2 | 2783 | return iter; |
1da177e4 LT |
2784 | } |
2785 | ||
7bcd6b0e | 2786 | #define TGID_OFFSET (FIRST_PROCESS_ENTRY + ARRAY_SIZE(proc_base_stuff)) |
0804ef4b | 2787 | |
61a28784 | 2788 | static int proc_pid_fill_cache(struct file *filp, void *dirent, filldir_t filldir, |
19fd4bb2 | 2789 | struct tgid_iter iter) |
61a28784 EB |
2790 | { |
2791 | char name[PROC_NUMBUF]; | |
19fd4bb2 | 2792 | int len = snprintf(name, sizeof(name), "%d", iter.tgid); |
61a28784 | 2793 | return proc_fill_cache(filp, dirent, filldir, name, len, |
19fd4bb2 | 2794 | proc_pid_instantiate, iter.task, NULL); |
61a28784 EB |
2795 | } |
2796 | ||
1da177e4 LT |
2797 | /* for the /proc/ directory itself, after non-process stuff has been done */ |
2798 | int proc_pid_readdir(struct file * filp, void * dirent, filldir_t filldir) | |
2799 | { | |
1da177e4 | 2800 | unsigned int nr = filp->f_pos - FIRST_PROCESS_ENTRY; |
2fddfeef | 2801 | struct task_struct *reaper = get_proc_task(filp->f_path.dentry->d_inode); |
19fd4bb2 | 2802 | struct tgid_iter iter; |
b488893a | 2803 | struct pid_namespace *ns; |
1da177e4 | 2804 | |
61a28784 EB |
2805 | if (!reaper) |
2806 | goto out_no_task; | |
2807 | ||
7bcd6b0e | 2808 | for (; nr < ARRAY_SIZE(proc_base_stuff); filp->f_pos++, nr++) { |
c5141e6d | 2809 | const struct pid_entry *p = &proc_base_stuff[nr]; |
61a28784 | 2810 | if (proc_base_fill_cache(filp, dirent, filldir, reaper, p) < 0) |
801199ce | 2811 | goto out; |
1da177e4 LT |
2812 | } |
2813 | ||
b488893a | 2814 | ns = filp->f_dentry->d_sb->s_fs_info; |
19fd4bb2 EB |
2815 | iter.task = NULL; |
2816 | iter.tgid = filp->f_pos - TGID_OFFSET; | |
2817 | for (iter = next_tgid(ns, iter); | |
2818 | iter.task; | |
2819 | iter.tgid += 1, iter = next_tgid(ns, iter)) { | |
2820 | filp->f_pos = iter.tgid + TGID_OFFSET; | |
2821 | if (proc_pid_fill_cache(filp, dirent, filldir, iter) < 0) { | |
2822 | put_task_struct(iter.task); | |
0804ef4b | 2823 | goto out; |
1da177e4 | 2824 | } |
0bc58a91 | 2825 | } |
0804ef4b EB |
2826 | filp->f_pos = PID_MAX_LIMIT + TGID_OFFSET; |
2827 | out: | |
61a28784 EB |
2828 | put_task_struct(reaper); |
2829 | out_no_task: | |
0bc58a91 EB |
2830 | return 0; |
2831 | } | |
1da177e4 | 2832 | |
28a6d671 EB |
2833 | /* |
2834 | * Tasks | |
2835 | */ | |
c5141e6d | 2836 | static const struct pid_entry tid_base_stuff[] = { |
631f9c18 AD |
2837 | DIR("fd", S_IRUSR|S_IXUSR, proc_fd_inode_operations, proc_fd_operations), |
2838 | DIR("fdinfo", S_IRUSR|S_IXUSR, proc_fdinfo_inode_operations, proc_fd_operations), | |
2839 | REG("environ", S_IRUSR, proc_environ_operations), | |
2840 | INF("auxv", S_IRUSR, proc_pid_auxv), | |
2841 | ONE("status", S_IRUGO, proc_pid_status), | |
2842 | ONE("personality", S_IRUSR, proc_pid_personality), | |
2843 | INF("limits", S_IRUSR, proc_pid_limits), | |
43ae34cb | 2844 | #ifdef CONFIG_SCHED_DEBUG |
631f9c18 | 2845 | REG("sched", S_IRUGO|S_IWUSR, proc_pid_sched_operations), |
ebcb6734 RM |
2846 | #endif |
2847 | #ifdef CONFIG_HAVE_ARCH_TRACEHOOK | |
631f9c18 | 2848 | INF("syscall", S_IRUSR, proc_pid_syscall), |
43ae34cb | 2849 | #endif |
631f9c18 AD |
2850 | INF("cmdline", S_IRUGO, proc_pid_cmdline), |
2851 | ONE("stat", S_IRUGO, proc_tid_stat), | |
2852 | ONE("statm", S_IRUGO, proc_pid_statm), | |
2853 | REG("maps", S_IRUGO, proc_maps_operations), | |
28a6d671 | 2854 | #ifdef CONFIG_NUMA |
631f9c18 | 2855 | REG("numa_maps", S_IRUGO, proc_numa_maps_operations), |
28a6d671 | 2856 | #endif |
631f9c18 AD |
2857 | REG("mem", S_IRUSR|S_IWUSR, proc_mem_operations), |
2858 | LNK("cwd", proc_cwd_link), | |
2859 | LNK("root", proc_root_link), | |
2860 | LNK("exe", proc_exe_link), | |
2861 | REG("mounts", S_IRUGO, proc_mounts_operations), | |
2862 | REG("mountinfo", S_IRUGO, proc_mountinfo_operations), | |
1e883281 | 2863 | #ifdef CONFIG_PROC_PAGE_MONITOR |
631f9c18 AD |
2864 | REG("clear_refs", S_IWUSR, proc_clear_refs_operations), |
2865 | REG("smaps", S_IRUGO, proc_smaps_operations), | |
2866 | REG("pagemap", S_IRUSR, proc_pagemap_operations), | |
28a6d671 EB |
2867 | #endif |
2868 | #ifdef CONFIG_SECURITY | |
631f9c18 | 2869 | DIR("attr", S_IRUGO|S_IXUGO, proc_attr_dir_inode_operations, proc_attr_dir_operations), |
28a6d671 EB |
2870 | #endif |
2871 | #ifdef CONFIG_KALLSYMS | |
631f9c18 | 2872 | INF("wchan", S_IRUGO, proc_pid_wchan), |
28a6d671 | 2873 | #endif |
2ec220e2 KC |
2874 | #ifdef CONFIG_STACKTRACE |
2875 | ONE("stack", S_IRUSR, proc_pid_stack), | |
28a6d671 EB |
2876 | #endif |
2877 | #ifdef CONFIG_SCHEDSTATS | |
631f9c18 | 2878 | INF("schedstat", S_IRUGO, proc_pid_schedstat), |
28a6d671 | 2879 | #endif |
9745512c | 2880 | #ifdef CONFIG_LATENCYTOP |
631f9c18 | 2881 | REG("latency", S_IRUGO, proc_lstats_operations), |
9745512c | 2882 | #endif |
8793d854 | 2883 | #ifdef CONFIG_PROC_PID_CPUSET |
631f9c18 | 2884 | REG("cpuset", S_IRUGO, proc_cpuset_operations), |
a424316c PM |
2885 | #endif |
2886 | #ifdef CONFIG_CGROUPS | |
631f9c18 | 2887 | REG("cgroup", S_IRUGO, proc_cgroup_operations), |
28a6d671 | 2888 | #endif |
631f9c18 AD |
2889 | INF("oom_score", S_IRUGO, proc_oom_score), |
2890 | REG("oom_adj", S_IRUGO|S_IWUSR, proc_oom_adjust_operations), | |
28a6d671 | 2891 | #ifdef CONFIG_AUDITSYSCALL |
631f9c18 AD |
2892 | REG("loginuid", S_IWUSR|S_IRUGO, proc_loginuid_operations), |
2893 | REG("sessionid", S_IRUSR, proc_sessionid_operations), | |
28a6d671 | 2894 | #endif |
f4f154fd | 2895 | #ifdef CONFIG_FAULT_INJECTION |
631f9c18 | 2896 | REG("make-it-fail", S_IRUGO|S_IWUSR, proc_fault_inject_operations), |
f4f154fd | 2897 | #endif |
297c5d92 | 2898 | #ifdef CONFIG_TASK_IO_ACCOUNTING |
631f9c18 | 2899 | INF("io", S_IRUGO, proc_tid_io_accounting), |
297c5d92 | 2900 | #endif |
28a6d671 EB |
2901 | }; |
2902 | ||
2903 | static int proc_tid_base_readdir(struct file * filp, | |
2904 | void * dirent, filldir_t filldir) | |
2905 | { | |
2906 | return proc_pident_readdir(filp,dirent,filldir, | |
2907 | tid_base_stuff,ARRAY_SIZE(tid_base_stuff)); | |
2908 | } | |
2909 | ||
2910 | static struct dentry *proc_tid_base_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd){ | |
7bcd6b0e EB |
2911 | return proc_pident_lookup(dir, dentry, |
2912 | tid_base_stuff, ARRAY_SIZE(tid_base_stuff)); | |
28a6d671 EB |
2913 | } |
2914 | ||
00977a59 | 2915 | static const struct file_operations proc_tid_base_operations = { |
28a6d671 EB |
2916 | .read = generic_read_dir, |
2917 | .readdir = proc_tid_base_readdir, | |
2918 | }; | |
2919 | ||
c5ef1c42 | 2920 | static const struct inode_operations proc_tid_base_inode_operations = { |
28a6d671 EB |
2921 | .lookup = proc_tid_base_lookup, |
2922 | .getattr = pid_getattr, | |
2923 | .setattr = proc_setattr, | |
2924 | }; | |
2925 | ||
444ceed8 | 2926 | static struct dentry *proc_task_instantiate(struct inode *dir, |
c5141e6d | 2927 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
444ceed8 EB |
2928 | { |
2929 | struct dentry *error = ERR_PTR(-ENOENT); | |
2930 | struct inode *inode; | |
61a28784 | 2931 | inode = proc_pid_make_inode(dir->i_sb, task); |
444ceed8 EB |
2932 | |
2933 | if (!inode) | |
2934 | goto out; | |
2935 | inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO; | |
2936 | inode->i_op = &proc_tid_base_inode_operations; | |
2937 | inode->i_fop = &proc_tid_base_operations; | |
2938 | inode->i_flags|=S_IMMUTABLE; | |
aed54175 VN |
2939 | |
2940 | inode->i_nlink = 2 + pid_entry_count_dirs(tid_base_stuff, | |
2941 | ARRAY_SIZE(tid_base_stuff)); | |
444ceed8 EB |
2942 | |
2943 | dentry->d_op = &pid_dentry_operations; | |
2944 | ||
2945 | d_add(dentry, inode); | |
2946 | /* Close the race of the process dying before we return the dentry */ | |
2947 | if (pid_revalidate(dentry, NULL)) | |
2948 | error = NULL; | |
2949 | out: | |
2950 | return error; | |
2951 | } | |
2952 | ||
28a6d671 EB |
2953 | static struct dentry *proc_task_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd) |
2954 | { | |
2955 | struct dentry *result = ERR_PTR(-ENOENT); | |
2956 | struct task_struct *task; | |
2957 | struct task_struct *leader = get_proc_task(dir); | |
28a6d671 | 2958 | unsigned tid; |
b488893a | 2959 | struct pid_namespace *ns; |
28a6d671 EB |
2960 | |
2961 | if (!leader) | |
2962 | goto out_no_task; | |
2963 | ||
2964 | tid = name_to_int(dentry); | |
2965 | if (tid == ~0U) | |
2966 | goto out; | |
2967 | ||
b488893a | 2968 | ns = dentry->d_sb->s_fs_info; |
28a6d671 | 2969 | rcu_read_lock(); |
b488893a | 2970 | task = find_task_by_pid_ns(tid, ns); |
28a6d671 EB |
2971 | if (task) |
2972 | get_task_struct(task); | |
2973 | rcu_read_unlock(); | |
2974 | if (!task) | |
2975 | goto out; | |
bac0abd6 | 2976 | if (!same_thread_group(leader, task)) |
28a6d671 EB |
2977 | goto out_drop_task; |
2978 | ||
444ceed8 | 2979 | result = proc_task_instantiate(dir, dentry, task, NULL); |
28a6d671 EB |
2980 | out_drop_task: |
2981 | put_task_struct(task); | |
2982 | out: | |
2983 | put_task_struct(leader); | |
2984 | out_no_task: | |
2985 | return result; | |
2986 | } | |
2987 | ||
0bc58a91 EB |
2988 | /* |
2989 | * Find the first tid of a thread group to return to user space. | |
2990 | * | |
2991 | * Usually this is just the thread group leader, but if the users | |
2992 | * buffer was too small or there was a seek into the middle of the | |
2993 | * directory we have more work todo. | |
2994 | * | |
2995 | * In the case of a short read we start with find_task_by_pid. | |
2996 | * | |
2997 | * In the case of a seek we start with the leader and walk nr | |
2998 | * threads past it. | |
2999 | */ | |
cc288738 | 3000 | static struct task_struct *first_tid(struct task_struct *leader, |
b488893a | 3001 | int tid, int nr, struct pid_namespace *ns) |
0bc58a91 | 3002 | { |
a872ff0c | 3003 | struct task_struct *pos; |
1da177e4 | 3004 | |
cc288738 | 3005 | rcu_read_lock(); |
0bc58a91 EB |
3006 | /* Attempt to start with the pid of a thread */ |
3007 | if (tid && (nr > 0)) { | |
b488893a | 3008 | pos = find_task_by_pid_ns(tid, ns); |
a872ff0c ON |
3009 | if (pos && (pos->group_leader == leader)) |
3010 | goto found; | |
0bc58a91 | 3011 | } |
1da177e4 | 3012 | |
0bc58a91 | 3013 | /* If nr exceeds the number of threads there is nothing todo */ |
a872ff0c ON |
3014 | pos = NULL; |
3015 | if (nr && nr >= get_nr_threads(leader)) | |
3016 | goto out; | |
1da177e4 | 3017 | |
a872ff0c ON |
3018 | /* If we haven't found our starting place yet start |
3019 | * with the leader and walk nr threads forward. | |
0bc58a91 | 3020 | */ |
a872ff0c ON |
3021 | for (pos = leader; nr > 0; --nr) { |
3022 | pos = next_thread(pos); | |
3023 | if (pos == leader) { | |
3024 | pos = NULL; | |
3025 | goto out; | |
3026 | } | |
1da177e4 | 3027 | } |
a872ff0c ON |
3028 | found: |
3029 | get_task_struct(pos); | |
3030 | out: | |
cc288738 | 3031 | rcu_read_unlock(); |
0bc58a91 EB |
3032 | return pos; |
3033 | } | |
3034 | ||
3035 | /* | |
3036 | * Find the next thread in the thread list. | |
3037 | * Return NULL if there is an error or no next thread. | |
3038 | * | |
3039 | * The reference to the input task_struct is released. | |
3040 | */ | |
3041 | static struct task_struct *next_tid(struct task_struct *start) | |
3042 | { | |
c1df7fb8 | 3043 | struct task_struct *pos = NULL; |
cc288738 | 3044 | rcu_read_lock(); |
c1df7fb8 | 3045 | if (pid_alive(start)) { |
0bc58a91 | 3046 | pos = next_thread(start); |
c1df7fb8 ON |
3047 | if (thread_group_leader(pos)) |
3048 | pos = NULL; | |
3049 | else | |
3050 | get_task_struct(pos); | |
3051 | } | |
cc288738 | 3052 | rcu_read_unlock(); |
0bc58a91 EB |
3053 | put_task_struct(start); |
3054 | return pos; | |
1da177e4 LT |
3055 | } |
3056 | ||
61a28784 EB |
3057 | static int proc_task_fill_cache(struct file *filp, void *dirent, filldir_t filldir, |
3058 | struct task_struct *task, int tid) | |
3059 | { | |
3060 | char name[PROC_NUMBUF]; | |
3061 | int len = snprintf(name, sizeof(name), "%d", tid); | |
3062 | return proc_fill_cache(filp, dirent, filldir, name, len, | |
3063 | proc_task_instantiate, task, NULL); | |
3064 | } | |
3065 | ||
1da177e4 LT |
3066 | /* for the /proc/TGID/task/ directories */ |
3067 | static int proc_task_readdir(struct file * filp, void * dirent, filldir_t filldir) | |
3068 | { | |
2fddfeef | 3069 | struct dentry *dentry = filp->f_path.dentry; |
1da177e4 | 3070 | struct inode *inode = dentry->d_inode; |
7d895244 | 3071 | struct task_struct *leader = NULL; |
0bc58a91 | 3072 | struct task_struct *task; |
1da177e4 LT |
3073 | int retval = -ENOENT; |
3074 | ino_t ino; | |
0bc58a91 | 3075 | int tid; |
b488893a | 3076 | struct pid_namespace *ns; |
1da177e4 | 3077 | |
7d895244 GC |
3078 | task = get_proc_task(inode); |
3079 | if (!task) | |
3080 | goto out_no_task; | |
3081 | rcu_read_lock(); | |
3082 | if (pid_alive(task)) { | |
3083 | leader = task->group_leader; | |
3084 | get_task_struct(leader); | |
3085 | } | |
3086 | rcu_read_unlock(); | |
3087 | put_task_struct(task); | |
99f89551 EB |
3088 | if (!leader) |
3089 | goto out_no_task; | |
1da177e4 LT |
3090 | retval = 0; |
3091 | ||
ee568b25 | 3092 | switch ((unsigned long)filp->f_pos) { |
1da177e4 LT |
3093 | case 0: |
3094 | ino = inode->i_ino; | |
ee6f779b | 3095 | if (filldir(dirent, ".", 1, filp->f_pos, ino, DT_DIR) < 0) |
1da177e4 | 3096 | goto out; |
ee6f779b | 3097 | filp->f_pos++; |
1da177e4 LT |
3098 | /* fall through */ |
3099 | case 1: | |
3100 | ino = parent_ino(dentry); | |
ee6f779b | 3101 | if (filldir(dirent, "..", 2, filp->f_pos, ino, DT_DIR) < 0) |
1da177e4 | 3102 | goto out; |
ee6f779b | 3103 | filp->f_pos++; |
1da177e4 LT |
3104 | /* fall through */ |
3105 | } | |
3106 | ||
0bc58a91 EB |
3107 | /* f_version caches the tgid value that the last readdir call couldn't |
3108 | * return. lseek aka telldir automagically resets f_version to 0. | |
3109 | */ | |
b488893a | 3110 | ns = filp->f_dentry->d_sb->s_fs_info; |
2b47c361 | 3111 | tid = (int)filp->f_version; |
0bc58a91 | 3112 | filp->f_version = 0; |
ee6f779b | 3113 | for (task = first_tid(leader, tid, filp->f_pos - 2, ns); |
0bc58a91 | 3114 | task; |
ee6f779b | 3115 | task = next_tid(task), filp->f_pos++) { |
b488893a | 3116 | tid = task_pid_nr_ns(task, ns); |
61a28784 | 3117 | if (proc_task_fill_cache(filp, dirent, filldir, task, tid) < 0) { |
0bc58a91 EB |
3118 | /* returning this tgid failed, save it as the first |
3119 | * pid for the next readir call */ | |
2b47c361 | 3120 | filp->f_version = (u64)tid; |
0bc58a91 | 3121 | put_task_struct(task); |
1da177e4 | 3122 | break; |
0bc58a91 | 3123 | } |
1da177e4 LT |
3124 | } |
3125 | out: | |
99f89551 EB |
3126 | put_task_struct(leader); |
3127 | out_no_task: | |
1da177e4 LT |
3128 | return retval; |
3129 | } | |
6e66b52b EB |
3130 | |
3131 | static int proc_task_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) | |
3132 | { | |
3133 | struct inode *inode = dentry->d_inode; | |
99f89551 | 3134 | struct task_struct *p = get_proc_task(inode); |
6e66b52b EB |
3135 | generic_fillattr(inode, stat); |
3136 | ||
99f89551 | 3137 | if (p) { |
99f89551 | 3138 | stat->nlink += get_nr_threads(p); |
99f89551 | 3139 | put_task_struct(p); |
6e66b52b EB |
3140 | } |
3141 | ||
3142 | return 0; | |
3143 | } | |
28a6d671 | 3144 | |
c5ef1c42 | 3145 | static const struct inode_operations proc_task_inode_operations = { |
28a6d671 EB |
3146 | .lookup = proc_task_lookup, |
3147 | .getattr = proc_task_getattr, | |
3148 | .setattr = proc_setattr, | |
3149 | }; | |
3150 | ||
00977a59 | 3151 | static const struct file_operations proc_task_operations = { |
28a6d671 EB |
3152 | .read = generic_read_dir, |
3153 | .readdir = proc_task_readdir, | |
3154 | }; |