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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/fs/proc/base.c | |
3 | * | |
4 | * Copyright (C) 1991, 1992 Linus Torvalds | |
5 | * | |
6 | * proc base directory handling functions | |
7 | * | |
8 | * 1999, Al Viro. Rewritten. Now it covers the whole per-process part. | |
9 | * Instead of using magical inumbers to determine the kind of object | |
10 | * we allocate and fill in-core inodes upon lookup. They don't even | |
11 | * go into icache. We cache the reference to task_struct upon lookup too. | |
12 | * Eventually it should become a filesystem in its own. We don't use the | |
13 | * rest of procfs anymore. | |
e070ad49 ML |
14 | * |
15 | * | |
16 | * Changelog: | |
17 | * 17-Jan-2005 | |
18 | * Allan Bezerra | |
19 | * Bruna Moreira <bruna.moreira@indt.org.br> | |
20 | * Edjard Mota <edjard.mota@indt.org.br> | |
21 | * Ilias Biris <ilias.biris@indt.org.br> | |
22 | * Mauricio Lin <mauricio.lin@indt.org.br> | |
23 | * | |
24 | * Embedded Linux Lab - 10LE Instituto Nokia de Tecnologia - INdT | |
25 | * | |
26 | * A new process specific entry (smaps) included in /proc. It shows the | |
27 | * size of rss for each memory area. The maps entry lacks information | |
28 | * about physical memory size (rss) for each mapped file, i.e., | |
29 | * rss information for executables and library files. | |
30 | * This additional information is useful for any tools that need to know | |
31 | * about physical memory consumption for a process specific library. | |
32 | * | |
33 | * Changelog: | |
34 | * 21-Feb-2005 | |
35 | * Embedded Linux Lab - 10LE Instituto Nokia de Tecnologia - INdT | |
36 | * Pud inclusion in the page table walking. | |
37 | * | |
38 | * ChangeLog: | |
39 | * 10-Mar-2005 | |
40 | * 10LE Instituto Nokia de Tecnologia - INdT: | |
41 | * A better way to walks through the page table as suggested by Hugh Dickins. | |
42 | * | |
43 | * Simo Piiroinen <simo.piiroinen@nokia.com>: | |
44 | * Smaps information related to shared, private, clean and dirty pages. | |
45 | * | |
46 | * Paul Mundt <paul.mundt@nokia.com>: | |
47 | * Overall revision about smaps. | |
1da177e4 LT |
48 | */ |
49 | ||
50 | #include <asm/uaccess.h> | |
51 | ||
1da177e4 LT |
52 | #include <linux/errno.h> |
53 | #include <linux/time.h> | |
54 | #include <linux/proc_fs.h> | |
55 | #include <linux/stat.h> | |
56 | #include <linux/init.h> | |
16f7e0fe | 57 | #include <linux/capability.h> |
1da177e4 LT |
58 | #include <linux/file.h> |
59 | #include <linux/string.h> | |
60 | #include <linux/seq_file.h> | |
61 | #include <linux/namei.h> | |
6b3286ed | 62 | #include <linux/mnt_namespace.h> |
1da177e4 | 63 | #include <linux/mm.h> |
b835996f | 64 | #include <linux/rcupdate.h> |
1da177e4 | 65 | #include <linux/kallsyms.h> |
d85f50d5 | 66 | #include <linux/resource.h> |
5096add8 | 67 | #include <linux/module.h> |
1da177e4 LT |
68 | #include <linux/mount.h> |
69 | #include <linux/security.h> | |
70 | #include <linux/ptrace.h> | |
a424316c | 71 | #include <linux/cgroup.h> |
1da177e4 LT |
72 | #include <linux/cpuset.h> |
73 | #include <linux/audit.h> | |
5addc5dd | 74 | #include <linux/poll.h> |
1651e14e | 75 | #include <linux/nsproxy.h> |
8ac773b4 | 76 | #include <linux/oom.h> |
3cb4a0bb | 77 | #include <linux/elf.h> |
60347f67 | 78 | #include <linux/pid_namespace.h> |
1da177e4 LT |
79 | #include "internal.h" |
80 | ||
0f2fe20f EB |
81 | /* NOTE: |
82 | * Implementing inode permission operations in /proc is almost | |
83 | * certainly an error. Permission checks need to happen during | |
84 | * each system call not at open time. The reason is that most of | |
85 | * what we wish to check for permissions in /proc varies at runtime. | |
86 | * | |
87 | * The classic example of a problem is opening file descriptors | |
88 | * in /proc for a task before it execs a suid executable. | |
89 | */ | |
90 | ||
1da177e4 | 91 | |
8578cea7 | 92 | /* Worst case buffer size needed for holding an integer. */ |
0187f879 | 93 | #define PROC_NUMBUF 13 |
8578cea7 | 94 | |
1da177e4 | 95 | struct pid_entry { |
1da177e4 | 96 | char *name; |
c5141e6d | 97 | int len; |
1da177e4 | 98 | mode_t mode; |
c5ef1c42 | 99 | const struct inode_operations *iop; |
00977a59 | 100 | const struct file_operations *fop; |
20cdc894 | 101 | union proc_op op; |
1da177e4 LT |
102 | }; |
103 | ||
61a28784 | 104 | #define NOD(NAME, MODE, IOP, FOP, OP) { \ |
20cdc894 | 105 | .name = (NAME), \ |
c5141e6d | 106 | .len = sizeof(NAME) - 1, \ |
20cdc894 EB |
107 | .mode = MODE, \ |
108 | .iop = IOP, \ | |
109 | .fop = FOP, \ | |
110 | .op = OP, \ | |
111 | } | |
112 | ||
61a28784 EB |
113 | #define DIR(NAME, MODE, OTYPE) \ |
114 | NOD(NAME, (S_IFDIR|(MODE)), \ | |
20cdc894 EB |
115 | &proc_##OTYPE##_inode_operations, &proc_##OTYPE##_operations, \ |
116 | {} ) | |
61a28784 EB |
117 | #define LNK(NAME, OTYPE) \ |
118 | NOD(NAME, (S_IFLNK|S_IRWXUGO), \ | |
20cdc894 EB |
119 | &proc_pid_link_inode_operations, NULL, \ |
120 | { .proc_get_link = &proc_##OTYPE##_link } ) | |
61a28784 EB |
121 | #define REG(NAME, MODE, OTYPE) \ |
122 | NOD(NAME, (S_IFREG|(MODE)), NULL, \ | |
20cdc894 | 123 | &proc_##OTYPE##_operations, {}) |
61a28784 EB |
124 | #define INF(NAME, MODE, OTYPE) \ |
125 | NOD(NAME, (S_IFREG|(MODE)), \ | |
20cdc894 EB |
126 | NULL, &proc_info_file_operations, \ |
127 | { .proc_read = &proc_##OTYPE } ) | |
1da177e4 | 128 | |
5096add8 KC |
129 | int maps_protect; |
130 | EXPORT_SYMBOL(maps_protect); | |
131 | ||
0494f6ec | 132 | static struct fs_struct *get_fs_struct(struct task_struct *task) |
1da177e4 LT |
133 | { |
134 | struct fs_struct *fs; | |
0494f6ec MS |
135 | task_lock(task); |
136 | fs = task->fs; | |
1da177e4 LT |
137 | if(fs) |
138 | atomic_inc(&fs->count); | |
0494f6ec MS |
139 | task_unlock(task); |
140 | return fs; | |
141 | } | |
142 | ||
99f89551 EB |
143 | static int get_nr_threads(struct task_struct *tsk) |
144 | { | |
145 | /* Must be called with the rcu_read_lock held */ | |
146 | unsigned long flags; | |
147 | int count = 0; | |
148 | ||
149 | if (lock_task_sighand(tsk, &flags)) { | |
150 | count = atomic_read(&tsk->signal->count); | |
151 | unlock_task_sighand(tsk, &flags); | |
152 | } | |
153 | return count; | |
154 | } | |
155 | ||
0494f6ec MS |
156 | static int proc_cwd_link(struct inode *inode, struct dentry **dentry, struct vfsmount **mnt) |
157 | { | |
99f89551 EB |
158 | struct task_struct *task = get_proc_task(inode); |
159 | struct fs_struct *fs = NULL; | |
0494f6ec | 160 | int result = -ENOENT; |
99f89551 EB |
161 | |
162 | if (task) { | |
163 | fs = get_fs_struct(task); | |
164 | put_task_struct(task); | |
165 | } | |
1da177e4 LT |
166 | if (fs) { |
167 | read_lock(&fs->lock); | |
168 | *mnt = mntget(fs->pwdmnt); | |
169 | *dentry = dget(fs->pwd); | |
170 | read_unlock(&fs->lock); | |
171 | result = 0; | |
172 | put_fs_struct(fs); | |
173 | } | |
174 | return result; | |
175 | } | |
176 | ||
177 | static int proc_root_link(struct inode *inode, struct dentry **dentry, struct vfsmount **mnt) | |
178 | { | |
99f89551 EB |
179 | struct task_struct *task = get_proc_task(inode); |
180 | struct fs_struct *fs = NULL; | |
1da177e4 | 181 | int result = -ENOENT; |
99f89551 EB |
182 | |
183 | if (task) { | |
184 | fs = get_fs_struct(task); | |
185 | put_task_struct(task); | |
186 | } | |
1da177e4 LT |
187 | if (fs) { |
188 | read_lock(&fs->lock); | |
189 | *mnt = mntget(fs->rootmnt); | |
190 | *dentry = dget(fs->root); | |
191 | read_unlock(&fs->lock); | |
192 | result = 0; | |
193 | put_fs_struct(fs); | |
194 | } | |
195 | return result; | |
196 | } | |
197 | ||
198 | #define MAY_PTRACE(task) \ | |
199 | (task == current || \ | |
200 | (task->parent == current && \ | |
201 | (task->ptrace & PT_PTRACED) && \ | |
6d8982d9 | 202 | (task_is_stopped_or_traced(task)) && \ |
1da177e4 LT |
203 | security_ptrace(current,task) == 0)) |
204 | ||
831830b5 AV |
205 | struct mm_struct *mm_for_maps(struct task_struct *task) |
206 | { | |
207 | struct mm_struct *mm = get_task_mm(task); | |
208 | if (!mm) | |
209 | return NULL; | |
210 | down_read(&mm->mmap_sem); | |
211 | task_lock(task); | |
212 | if (task->mm != mm) | |
213 | goto out; | |
214 | if (task->mm != current->mm && __ptrace_may_attach(task) < 0) | |
215 | goto out; | |
216 | task_unlock(task); | |
217 | return mm; | |
218 | out: | |
219 | task_unlock(task); | |
220 | up_read(&mm->mmap_sem); | |
221 | mmput(mm); | |
222 | return NULL; | |
223 | } | |
224 | ||
1da177e4 LT |
225 | static int proc_pid_cmdline(struct task_struct *task, char * buffer) |
226 | { | |
227 | int res = 0; | |
228 | unsigned int len; | |
229 | struct mm_struct *mm = get_task_mm(task); | |
230 | if (!mm) | |
231 | goto out; | |
232 | if (!mm->arg_end) | |
233 | goto out_mm; /* Shh! No looking before we're done */ | |
234 | ||
235 | len = mm->arg_end - mm->arg_start; | |
236 | ||
237 | if (len > PAGE_SIZE) | |
238 | len = PAGE_SIZE; | |
239 | ||
240 | res = access_process_vm(task, mm->arg_start, buffer, len, 0); | |
241 | ||
242 | // If the nul at the end of args has been overwritten, then | |
243 | // assume application is using setproctitle(3). | |
244 | if (res > 0 && buffer[res-1] != '\0' && len < PAGE_SIZE) { | |
245 | len = strnlen(buffer, res); | |
246 | if (len < res) { | |
247 | res = len; | |
248 | } else { | |
249 | len = mm->env_end - mm->env_start; | |
250 | if (len > PAGE_SIZE - res) | |
251 | len = PAGE_SIZE - res; | |
252 | res += access_process_vm(task, mm->env_start, buffer+res, len, 0); | |
253 | res = strnlen(buffer, res); | |
254 | } | |
255 | } | |
256 | out_mm: | |
257 | mmput(mm); | |
258 | out: | |
259 | return res; | |
260 | } | |
261 | ||
262 | static int proc_pid_auxv(struct task_struct *task, char *buffer) | |
263 | { | |
264 | int res = 0; | |
265 | struct mm_struct *mm = get_task_mm(task); | |
266 | if (mm) { | |
267 | unsigned int nwords = 0; | |
268 | do | |
269 | nwords += 2; | |
270 | while (mm->saved_auxv[nwords - 2] != 0); /* AT_NULL */ | |
271 | res = nwords * sizeof(mm->saved_auxv[0]); | |
272 | if (res > PAGE_SIZE) | |
273 | res = PAGE_SIZE; | |
274 | memcpy(buffer, mm->saved_auxv, res); | |
275 | mmput(mm); | |
276 | } | |
277 | return res; | |
278 | } | |
279 | ||
280 | ||
281 | #ifdef CONFIG_KALLSYMS | |
282 | /* | |
283 | * Provides a wchan file via kallsyms in a proper one-value-per-file format. | |
284 | * Returns the resolved symbol. If that fails, simply return the address. | |
285 | */ | |
286 | static int proc_pid_wchan(struct task_struct *task, char *buffer) | |
287 | { | |
ffb45122 | 288 | unsigned long wchan; |
9281acea | 289 | char symname[KSYM_NAME_LEN]; |
1da177e4 LT |
290 | |
291 | wchan = get_wchan(task); | |
292 | ||
9d65cb4a AD |
293 | if (lookup_symbol_name(wchan, symname) < 0) |
294 | return sprintf(buffer, "%lu", wchan); | |
295 | else | |
296 | return sprintf(buffer, "%s", symname); | |
1da177e4 LT |
297 | } |
298 | #endif /* CONFIG_KALLSYMS */ | |
299 | ||
300 | #ifdef CONFIG_SCHEDSTATS | |
301 | /* | |
302 | * Provides /proc/PID/schedstat | |
303 | */ | |
304 | static int proc_pid_schedstat(struct task_struct *task, char *buffer) | |
305 | { | |
172ba844 | 306 | return sprintf(buffer, "%llu %llu %lu\n", |
1da177e4 LT |
307 | task->sched_info.cpu_time, |
308 | task->sched_info.run_delay, | |
2d72376b | 309 | task->sched_info.pcount); |
1da177e4 LT |
310 | } |
311 | #endif | |
312 | ||
9745512c AV |
313 | #ifdef CONFIG_LATENCYTOP |
314 | static int lstats_show_proc(struct seq_file *m, void *v) | |
315 | { | |
316 | int i; | |
317 | struct task_struct *task = m->private; | |
318 | seq_puts(m, "Latency Top version : v0.1\n"); | |
319 | ||
320 | for (i = 0; i < 32; i++) { | |
321 | if (task->latency_record[i].backtrace[0]) { | |
322 | int q; | |
323 | seq_printf(m, "%i %li %li ", | |
324 | task->latency_record[i].count, | |
325 | task->latency_record[i].time, | |
326 | task->latency_record[i].max); | |
327 | for (q = 0; q < LT_BACKTRACEDEPTH; q++) { | |
328 | char sym[KSYM_NAME_LEN]; | |
329 | char *c; | |
330 | if (!task->latency_record[i].backtrace[q]) | |
331 | break; | |
332 | if (task->latency_record[i].backtrace[q] == ULONG_MAX) | |
333 | break; | |
334 | sprint_symbol(sym, task->latency_record[i].backtrace[q]); | |
335 | c = strchr(sym, '+'); | |
336 | if (c) | |
337 | *c = 0; | |
338 | seq_printf(m, "%s ", sym); | |
339 | } | |
340 | seq_printf(m, "\n"); | |
341 | } | |
342 | ||
343 | } | |
344 | return 0; | |
345 | } | |
346 | ||
347 | static int lstats_open(struct inode *inode, struct file *file) | |
348 | { | |
349 | int ret; | |
350 | struct seq_file *m; | |
351 | struct task_struct *task = get_proc_task(inode); | |
352 | ||
353 | ret = single_open(file, lstats_show_proc, NULL); | |
354 | if (!ret) { | |
355 | m = file->private_data; | |
356 | m->private = task; | |
357 | } | |
358 | return ret; | |
359 | } | |
360 | ||
361 | static ssize_t lstats_write(struct file *file, const char __user *buf, | |
362 | size_t count, loff_t *offs) | |
363 | { | |
364 | struct seq_file *m; | |
365 | struct task_struct *task; | |
366 | ||
367 | m = file->private_data; | |
368 | task = m->private; | |
369 | clear_all_latency_tracing(task); | |
370 | ||
371 | return count; | |
372 | } | |
373 | ||
374 | static const struct file_operations proc_lstats_operations = { | |
375 | .open = lstats_open, | |
376 | .read = seq_read, | |
377 | .write = lstats_write, | |
378 | .llseek = seq_lseek, | |
379 | .release = single_release, | |
380 | }; | |
381 | ||
382 | #endif | |
383 | ||
1da177e4 LT |
384 | /* The badness from the OOM killer */ |
385 | unsigned long badness(struct task_struct *p, unsigned long uptime); | |
386 | static int proc_oom_score(struct task_struct *task, char *buffer) | |
387 | { | |
388 | unsigned long points; | |
389 | struct timespec uptime; | |
390 | ||
391 | do_posix_clock_monotonic_gettime(&uptime); | |
19c5d45a | 392 | read_lock(&tasklist_lock); |
1da177e4 | 393 | points = badness(task, uptime.tv_sec); |
19c5d45a | 394 | read_unlock(&tasklist_lock); |
1da177e4 LT |
395 | return sprintf(buffer, "%lu\n", points); |
396 | } | |
397 | ||
d85f50d5 NH |
398 | struct limit_names { |
399 | char *name; | |
400 | char *unit; | |
401 | }; | |
402 | ||
403 | static const struct limit_names lnames[RLIM_NLIMITS] = { | |
404 | [RLIMIT_CPU] = {"Max cpu time", "ms"}, | |
405 | [RLIMIT_FSIZE] = {"Max file size", "bytes"}, | |
406 | [RLIMIT_DATA] = {"Max data size", "bytes"}, | |
407 | [RLIMIT_STACK] = {"Max stack size", "bytes"}, | |
408 | [RLIMIT_CORE] = {"Max core file size", "bytes"}, | |
409 | [RLIMIT_RSS] = {"Max resident set", "bytes"}, | |
410 | [RLIMIT_NPROC] = {"Max processes", "processes"}, | |
411 | [RLIMIT_NOFILE] = {"Max open files", "files"}, | |
412 | [RLIMIT_MEMLOCK] = {"Max locked memory", "bytes"}, | |
413 | [RLIMIT_AS] = {"Max address space", "bytes"}, | |
414 | [RLIMIT_LOCKS] = {"Max file locks", "locks"}, | |
415 | [RLIMIT_SIGPENDING] = {"Max pending signals", "signals"}, | |
416 | [RLIMIT_MSGQUEUE] = {"Max msgqueue size", "bytes"}, | |
417 | [RLIMIT_NICE] = {"Max nice priority", NULL}, | |
418 | [RLIMIT_RTPRIO] = {"Max realtime priority", NULL}, | |
419 | }; | |
420 | ||
421 | /* Display limits for a process */ | |
422 | static int proc_pid_limits(struct task_struct *task, char *buffer) | |
423 | { | |
424 | unsigned int i; | |
425 | int count = 0; | |
426 | unsigned long flags; | |
427 | char *bufptr = buffer; | |
428 | ||
429 | struct rlimit rlim[RLIM_NLIMITS]; | |
430 | ||
431 | rcu_read_lock(); | |
432 | if (!lock_task_sighand(task,&flags)) { | |
433 | rcu_read_unlock(); | |
434 | return 0; | |
435 | } | |
436 | memcpy(rlim, task->signal->rlim, sizeof(struct rlimit) * RLIM_NLIMITS); | |
437 | unlock_task_sighand(task, &flags); | |
438 | rcu_read_unlock(); | |
439 | ||
440 | /* | |
441 | * print the file header | |
442 | */ | |
443 | count += sprintf(&bufptr[count], "%-25s %-20s %-20s %-10s\n", | |
444 | "Limit", "Soft Limit", "Hard Limit", "Units"); | |
445 | ||
446 | for (i = 0; i < RLIM_NLIMITS; i++) { | |
447 | if (rlim[i].rlim_cur == RLIM_INFINITY) | |
448 | count += sprintf(&bufptr[count], "%-25s %-20s ", | |
449 | lnames[i].name, "unlimited"); | |
450 | else | |
451 | count += sprintf(&bufptr[count], "%-25s %-20lu ", | |
452 | lnames[i].name, rlim[i].rlim_cur); | |
453 | ||
454 | if (rlim[i].rlim_max == RLIM_INFINITY) | |
455 | count += sprintf(&bufptr[count], "%-20s ", "unlimited"); | |
456 | else | |
457 | count += sprintf(&bufptr[count], "%-20lu ", | |
458 | rlim[i].rlim_max); | |
459 | ||
460 | if (lnames[i].unit) | |
461 | count += sprintf(&bufptr[count], "%-10s\n", | |
462 | lnames[i].unit); | |
463 | else | |
464 | count += sprintf(&bufptr[count], "\n"); | |
465 | } | |
466 | ||
467 | return count; | |
468 | } | |
469 | ||
1da177e4 LT |
470 | /************************************************************************/ |
471 | /* Here the fs part begins */ | |
472 | /************************************************************************/ | |
473 | ||
474 | /* permission checks */ | |
778c1144 | 475 | static int proc_fd_access_allowed(struct inode *inode) |
1da177e4 | 476 | { |
778c1144 EB |
477 | struct task_struct *task; |
478 | int allowed = 0; | |
df26c40e EB |
479 | /* Allow access to a task's file descriptors if it is us or we |
480 | * may use ptrace attach to the process and find out that | |
481 | * information. | |
778c1144 EB |
482 | */ |
483 | task = get_proc_task(inode); | |
df26c40e EB |
484 | if (task) { |
485 | allowed = ptrace_may_attach(task); | |
778c1144 | 486 | put_task_struct(task); |
df26c40e | 487 | } |
778c1144 | 488 | return allowed; |
1da177e4 LT |
489 | } |
490 | ||
6d76fa58 LT |
491 | static int proc_setattr(struct dentry *dentry, struct iattr *attr) |
492 | { | |
493 | int error; | |
494 | struct inode *inode = dentry->d_inode; | |
495 | ||
496 | if (attr->ia_valid & ATTR_MODE) | |
497 | return -EPERM; | |
498 | ||
499 | error = inode_change_ok(inode, attr); | |
1e8123fd JJ |
500 | if (!error) |
501 | error = inode_setattr(inode, attr); | |
6d76fa58 LT |
502 | return error; |
503 | } | |
504 | ||
c5ef1c42 | 505 | static const struct inode_operations proc_def_inode_operations = { |
6d76fa58 LT |
506 | .setattr = proc_setattr, |
507 | }; | |
508 | ||
1da177e4 | 509 | extern struct seq_operations mounts_op; |
5addc5dd AV |
510 | struct proc_mounts { |
511 | struct seq_file m; | |
512 | int event; | |
513 | }; | |
514 | ||
1da177e4 LT |
515 | static int mounts_open(struct inode *inode, struct file *file) |
516 | { | |
99f89551 | 517 | struct task_struct *task = get_proc_task(inode); |
cf7b708c | 518 | struct nsproxy *nsp; |
6b3286ed | 519 | struct mnt_namespace *ns = NULL; |
5addc5dd AV |
520 | struct proc_mounts *p; |
521 | int ret = -EINVAL; | |
1da177e4 | 522 | |
99f89551 | 523 | if (task) { |
cf7b708c PE |
524 | rcu_read_lock(); |
525 | nsp = task_nsproxy(task); | |
526 | if (nsp) { | |
527 | ns = nsp->mnt_ns; | |
863c4702 AD |
528 | if (ns) |
529 | get_mnt_ns(ns); | |
530 | } | |
cf7b708c PE |
531 | rcu_read_unlock(); |
532 | ||
99f89551 EB |
533 | put_task_struct(task); |
534 | } | |
5addc5dd | 535 | |
6b3286ed | 536 | if (ns) { |
5addc5dd AV |
537 | ret = -ENOMEM; |
538 | p = kmalloc(sizeof(struct proc_mounts), GFP_KERNEL); | |
539 | if (p) { | |
540 | file->private_data = &p->m; | |
541 | ret = seq_open(file, &mounts_op); | |
542 | if (!ret) { | |
6b3286ed KK |
543 | p->m.private = ns; |
544 | p->event = ns->event; | |
5addc5dd AV |
545 | return 0; |
546 | } | |
547 | kfree(p); | |
1da177e4 | 548 | } |
6b3286ed | 549 | put_mnt_ns(ns); |
1da177e4 LT |
550 | } |
551 | return ret; | |
552 | } | |
553 | ||
554 | static int mounts_release(struct inode *inode, struct file *file) | |
555 | { | |
556 | struct seq_file *m = file->private_data; | |
6b3286ed KK |
557 | struct mnt_namespace *ns = m->private; |
558 | put_mnt_ns(ns); | |
1da177e4 LT |
559 | return seq_release(inode, file); |
560 | } | |
561 | ||
5addc5dd AV |
562 | static unsigned mounts_poll(struct file *file, poll_table *wait) |
563 | { | |
564 | struct proc_mounts *p = file->private_data; | |
6b3286ed | 565 | struct mnt_namespace *ns = p->m.private; |
5addc5dd AV |
566 | unsigned res = 0; |
567 | ||
568 | poll_wait(file, &ns->poll, wait); | |
569 | ||
570 | spin_lock(&vfsmount_lock); | |
571 | if (p->event != ns->event) { | |
572 | p->event = ns->event; | |
573 | res = POLLERR; | |
574 | } | |
575 | spin_unlock(&vfsmount_lock); | |
576 | ||
577 | return res; | |
578 | } | |
579 | ||
00977a59 | 580 | static const struct file_operations proc_mounts_operations = { |
1da177e4 LT |
581 | .open = mounts_open, |
582 | .read = seq_read, | |
583 | .llseek = seq_lseek, | |
584 | .release = mounts_release, | |
5addc5dd | 585 | .poll = mounts_poll, |
1da177e4 LT |
586 | }; |
587 | ||
b4629fe2 CL |
588 | extern struct seq_operations mountstats_op; |
589 | static int mountstats_open(struct inode *inode, struct file *file) | |
590 | { | |
b4629fe2 CL |
591 | int ret = seq_open(file, &mountstats_op); |
592 | ||
593 | if (!ret) { | |
594 | struct seq_file *m = file->private_data; | |
cf7b708c | 595 | struct nsproxy *nsp; |
6b3286ed | 596 | struct mnt_namespace *mnt_ns = NULL; |
99f89551 EB |
597 | struct task_struct *task = get_proc_task(inode); |
598 | ||
599 | if (task) { | |
cf7b708c PE |
600 | rcu_read_lock(); |
601 | nsp = task_nsproxy(task); | |
602 | if (nsp) { | |
603 | mnt_ns = nsp->mnt_ns; | |
604 | if (mnt_ns) | |
605 | get_mnt_ns(mnt_ns); | |
606 | } | |
607 | rcu_read_unlock(); | |
608 | ||
99f89551 EB |
609 | put_task_struct(task); |
610 | } | |
b4629fe2 | 611 | |
6b3286ed KK |
612 | if (mnt_ns) |
613 | m->private = mnt_ns; | |
b4629fe2 CL |
614 | else { |
615 | seq_release(inode, file); | |
616 | ret = -EINVAL; | |
617 | } | |
618 | } | |
619 | return ret; | |
620 | } | |
621 | ||
00977a59 | 622 | static const struct file_operations proc_mountstats_operations = { |
b4629fe2 CL |
623 | .open = mountstats_open, |
624 | .read = seq_read, | |
625 | .llseek = seq_lseek, | |
626 | .release = mounts_release, | |
627 | }; | |
628 | ||
1da177e4 LT |
629 | #define PROC_BLOCK_SIZE (3*1024) /* 4K page size but our output routines use some slack for overruns */ |
630 | ||
631 | static ssize_t proc_info_read(struct file * file, char __user * buf, | |
632 | size_t count, loff_t *ppos) | |
633 | { | |
2fddfeef | 634 | struct inode * inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
635 | unsigned long page; |
636 | ssize_t length; | |
99f89551 EB |
637 | struct task_struct *task = get_proc_task(inode); |
638 | ||
639 | length = -ESRCH; | |
640 | if (!task) | |
641 | goto out_no_task; | |
1da177e4 LT |
642 | |
643 | if (count > PROC_BLOCK_SIZE) | |
644 | count = PROC_BLOCK_SIZE; | |
99f89551 EB |
645 | |
646 | length = -ENOMEM; | |
e12ba74d | 647 | if (!(page = __get_free_page(GFP_TEMPORARY))) |
99f89551 | 648 | goto out; |
1da177e4 LT |
649 | |
650 | length = PROC_I(inode)->op.proc_read(task, (char*)page); | |
651 | ||
652 | if (length >= 0) | |
653 | length = simple_read_from_buffer(buf, count, ppos, (char *)page, length); | |
654 | free_page(page); | |
99f89551 EB |
655 | out: |
656 | put_task_struct(task); | |
657 | out_no_task: | |
1da177e4 LT |
658 | return length; |
659 | } | |
660 | ||
00977a59 | 661 | static const struct file_operations proc_info_file_operations = { |
1da177e4 LT |
662 | .read = proc_info_read, |
663 | }; | |
664 | ||
665 | static int mem_open(struct inode* inode, struct file* file) | |
666 | { | |
667 | file->private_data = (void*)((long)current->self_exec_id); | |
668 | return 0; | |
669 | } | |
670 | ||
671 | static ssize_t mem_read(struct file * file, char __user * buf, | |
672 | size_t count, loff_t *ppos) | |
673 | { | |
2fddfeef | 674 | struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode); |
1da177e4 LT |
675 | char *page; |
676 | unsigned long src = *ppos; | |
677 | int ret = -ESRCH; | |
678 | struct mm_struct *mm; | |
679 | ||
99f89551 EB |
680 | if (!task) |
681 | goto out_no_task; | |
682 | ||
ab8d11be | 683 | if (!MAY_PTRACE(task) || !ptrace_may_attach(task)) |
1da177e4 LT |
684 | goto out; |
685 | ||
686 | ret = -ENOMEM; | |
e12ba74d | 687 | page = (char *)__get_free_page(GFP_TEMPORARY); |
1da177e4 LT |
688 | if (!page) |
689 | goto out; | |
690 | ||
691 | ret = 0; | |
692 | ||
693 | mm = get_task_mm(task); | |
694 | if (!mm) | |
695 | goto out_free; | |
696 | ||
697 | ret = -EIO; | |
698 | ||
699 | if (file->private_data != (void*)((long)current->self_exec_id)) | |
700 | goto out_put; | |
701 | ||
702 | ret = 0; | |
703 | ||
704 | while (count > 0) { | |
705 | int this_len, retval; | |
706 | ||
707 | this_len = (count > PAGE_SIZE) ? PAGE_SIZE : count; | |
708 | retval = access_process_vm(task, src, page, this_len, 0); | |
ab8d11be | 709 | if (!retval || !MAY_PTRACE(task) || !ptrace_may_attach(task)) { |
1da177e4 LT |
710 | if (!ret) |
711 | ret = -EIO; | |
712 | break; | |
713 | } | |
714 | ||
715 | if (copy_to_user(buf, page, retval)) { | |
716 | ret = -EFAULT; | |
717 | break; | |
718 | } | |
719 | ||
720 | ret += retval; | |
721 | src += retval; | |
722 | buf += retval; | |
723 | count -= retval; | |
724 | } | |
725 | *ppos = src; | |
726 | ||
727 | out_put: | |
728 | mmput(mm); | |
729 | out_free: | |
730 | free_page((unsigned long) page); | |
731 | out: | |
99f89551 EB |
732 | put_task_struct(task); |
733 | out_no_task: | |
1da177e4 LT |
734 | return ret; |
735 | } | |
736 | ||
737 | #define mem_write NULL | |
738 | ||
739 | #ifndef mem_write | |
740 | /* This is a security hazard */ | |
63967fa9 | 741 | static ssize_t mem_write(struct file * file, const char __user *buf, |
1da177e4 LT |
742 | size_t count, loff_t *ppos) |
743 | { | |
f7ca54f4 | 744 | int copied; |
1da177e4 | 745 | char *page; |
2fddfeef | 746 | struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode); |
1da177e4 LT |
747 | unsigned long dst = *ppos; |
748 | ||
99f89551 EB |
749 | copied = -ESRCH; |
750 | if (!task) | |
751 | goto out_no_task; | |
752 | ||
ab8d11be | 753 | if (!MAY_PTRACE(task) || !ptrace_may_attach(task)) |
99f89551 | 754 | goto out; |
1da177e4 | 755 | |
99f89551 | 756 | copied = -ENOMEM; |
e12ba74d | 757 | page = (char *)__get_free_page(GFP_TEMPORARY); |
1da177e4 | 758 | if (!page) |
99f89551 | 759 | goto out; |
1da177e4 | 760 | |
f7ca54f4 | 761 | copied = 0; |
1da177e4 LT |
762 | while (count > 0) { |
763 | int this_len, retval; | |
764 | ||
765 | this_len = (count > PAGE_SIZE) ? PAGE_SIZE : count; | |
766 | if (copy_from_user(page, buf, this_len)) { | |
767 | copied = -EFAULT; | |
768 | break; | |
769 | } | |
770 | retval = access_process_vm(task, dst, page, this_len, 1); | |
771 | if (!retval) { | |
772 | if (!copied) | |
773 | copied = -EIO; | |
774 | break; | |
775 | } | |
776 | copied += retval; | |
777 | buf += retval; | |
778 | dst += retval; | |
779 | count -= retval; | |
780 | } | |
781 | *ppos = dst; | |
782 | free_page((unsigned long) page); | |
99f89551 EB |
783 | out: |
784 | put_task_struct(task); | |
785 | out_no_task: | |
1da177e4 LT |
786 | return copied; |
787 | } | |
788 | #endif | |
789 | ||
790 | static loff_t mem_lseek(struct file * file, loff_t offset, int orig) | |
791 | { | |
792 | switch (orig) { | |
793 | case 0: | |
794 | file->f_pos = offset; | |
795 | break; | |
796 | case 1: | |
797 | file->f_pos += offset; | |
798 | break; | |
799 | default: | |
800 | return -EINVAL; | |
801 | } | |
802 | force_successful_syscall_return(); | |
803 | return file->f_pos; | |
804 | } | |
805 | ||
00977a59 | 806 | static const struct file_operations proc_mem_operations = { |
1da177e4 LT |
807 | .llseek = mem_lseek, |
808 | .read = mem_read, | |
809 | .write = mem_write, | |
810 | .open = mem_open, | |
811 | }; | |
812 | ||
315e28c8 JP |
813 | static ssize_t environ_read(struct file *file, char __user *buf, |
814 | size_t count, loff_t *ppos) | |
815 | { | |
816 | struct task_struct *task = get_proc_task(file->f_dentry->d_inode); | |
817 | char *page; | |
818 | unsigned long src = *ppos; | |
819 | int ret = -ESRCH; | |
820 | struct mm_struct *mm; | |
821 | ||
822 | if (!task) | |
823 | goto out_no_task; | |
824 | ||
825 | if (!ptrace_may_attach(task)) | |
826 | goto out; | |
827 | ||
828 | ret = -ENOMEM; | |
829 | page = (char *)__get_free_page(GFP_TEMPORARY); | |
830 | if (!page) | |
831 | goto out; | |
832 | ||
833 | ret = 0; | |
834 | ||
835 | mm = get_task_mm(task); | |
836 | if (!mm) | |
837 | goto out_free; | |
838 | ||
839 | while (count > 0) { | |
840 | int this_len, retval, max_len; | |
841 | ||
842 | this_len = mm->env_end - (mm->env_start + src); | |
843 | ||
844 | if (this_len <= 0) | |
845 | break; | |
846 | ||
847 | max_len = (count > PAGE_SIZE) ? PAGE_SIZE : count; | |
848 | this_len = (this_len > max_len) ? max_len : this_len; | |
849 | ||
850 | retval = access_process_vm(task, (mm->env_start + src), | |
851 | page, this_len, 0); | |
852 | ||
853 | if (retval <= 0) { | |
854 | ret = retval; | |
855 | break; | |
856 | } | |
857 | ||
858 | if (copy_to_user(buf, page, retval)) { | |
859 | ret = -EFAULT; | |
860 | break; | |
861 | } | |
862 | ||
863 | ret += retval; | |
864 | src += retval; | |
865 | buf += retval; | |
866 | count -= retval; | |
867 | } | |
868 | *ppos = src; | |
869 | ||
870 | mmput(mm); | |
871 | out_free: | |
872 | free_page((unsigned long) page); | |
873 | out: | |
874 | put_task_struct(task); | |
875 | out_no_task: | |
876 | return ret; | |
877 | } | |
878 | ||
879 | static const struct file_operations proc_environ_operations = { | |
880 | .read = environ_read, | |
881 | }; | |
882 | ||
1da177e4 LT |
883 | static ssize_t oom_adjust_read(struct file *file, char __user *buf, |
884 | size_t count, loff_t *ppos) | |
885 | { | |
2fddfeef | 886 | struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode); |
8578cea7 | 887 | char buffer[PROC_NUMBUF]; |
1da177e4 | 888 | size_t len; |
99f89551 | 889 | int oom_adjust; |
1da177e4 | 890 | |
99f89551 EB |
891 | if (!task) |
892 | return -ESRCH; | |
893 | oom_adjust = task->oomkilladj; | |
894 | put_task_struct(task); | |
895 | ||
8578cea7 | 896 | len = snprintf(buffer, sizeof(buffer), "%i\n", oom_adjust); |
0c28f287 AM |
897 | |
898 | return simple_read_from_buffer(buf, count, ppos, buffer, len); | |
1da177e4 LT |
899 | } |
900 | ||
901 | static ssize_t oom_adjust_write(struct file *file, const char __user *buf, | |
902 | size_t count, loff_t *ppos) | |
903 | { | |
99f89551 | 904 | struct task_struct *task; |
8578cea7 | 905 | char buffer[PROC_NUMBUF], *end; |
1da177e4 LT |
906 | int oom_adjust; |
907 | ||
8578cea7 EB |
908 | memset(buffer, 0, sizeof(buffer)); |
909 | if (count > sizeof(buffer) - 1) | |
910 | count = sizeof(buffer) - 1; | |
1da177e4 LT |
911 | if (copy_from_user(buffer, buf, count)) |
912 | return -EFAULT; | |
913 | oom_adjust = simple_strtol(buffer, &end, 0); | |
8ac773b4 AD |
914 | if ((oom_adjust < OOM_ADJUST_MIN || oom_adjust > OOM_ADJUST_MAX) && |
915 | oom_adjust != OOM_DISABLE) | |
1da177e4 LT |
916 | return -EINVAL; |
917 | if (*end == '\n') | |
918 | end++; | |
2fddfeef | 919 | task = get_proc_task(file->f_path.dentry->d_inode); |
99f89551 EB |
920 | if (!task) |
921 | return -ESRCH; | |
8fb4fc68 GJ |
922 | if (oom_adjust < task->oomkilladj && !capable(CAP_SYS_RESOURCE)) { |
923 | put_task_struct(task); | |
924 | return -EACCES; | |
925 | } | |
1da177e4 | 926 | task->oomkilladj = oom_adjust; |
99f89551 | 927 | put_task_struct(task); |
1da177e4 LT |
928 | if (end - buffer == 0) |
929 | return -EIO; | |
930 | return end - buffer; | |
931 | } | |
932 | ||
00977a59 | 933 | static const struct file_operations proc_oom_adjust_operations = { |
1da177e4 LT |
934 | .read = oom_adjust_read, |
935 | .write = oom_adjust_write, | |
936 | }; | |
937 | ||
4b8df891 | 938 | #ifdef CONFIG_MMU |
b813e931 DR |
939 | static ssize_t clear_refs_write(struct file *file, const char __user *buf, |
940 | size_t count, loff_t *ppos) | |
941 | { | |
942 | struct task_struct *task; | |
943 | char buffer[PROC_NUMBUF], *end; | |
944 | struct mm_struct *mm; | |
945 | ||
946 | memset(buffer, 0, sizeof(buffer)); | |
947 | if (count > sizeof(buffer) - 1) | |
948 | count = sizeof(buffer) - 1; | |
949 | if (copy_from_user(buffer, buf, count)) | |
950 | return -EFAULT; | |
951 | if (!simple_strtol(buffer, &end, 0)) | |
952 | return -EINVAL; | |
953 | if (*end == '\n') | |
954 | end++; | |
955 | task = get_proc_task(file->f_path.dentry->d_inode); | |
956 | if (!task) | |
957 | return -ESRCH; | |
958 | mm = get_task_mm(task); | |
959 | if (mm) { | |
960 | clear_refs_smap(mm); | |
961 | mmput(mm); | |
962 | } | |
963 | put_task_struct(task); | |
964 | if (end - buffer == 0) | |
965 | return -EIO; | |
966 | return end - buffer; | |
967 | } | |
968 | ||
969 | static struct file_operations proc_clear_refs_operations = { | |
970 | .write = clear_refs_write, | |
971 | }; | |
4b8df891 | 972 | #endif |
b813e931 | 973 | |
1da177e4 LT |
974 | #ifdef CONFIG_AUDITSYSCALL |
975 | #define TMPBUFLEN 21 | |
976 | static ssize_t proc_loginuid_read(struct file * file, char __user * buf, | |
977 | size_t count, loff_t *ppos) | |
978 | { | |
2fddfeef | 979 | struct inode * inode = file->f_path.dentry->d_inode; |
99f89551 | 980 | struct task_struct *task = get_proc_task(inode); |
1da177e4 LT |
981 | ssize_t length; |
982 | char tmpbuf[TMPBUFLEN]; | |
983 | ||
99f89551 EB |
984 | if (!task) |
985 | return -ESRCH; | |
1da177e4 | 986 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", |
0c11b942 | 987 | audit_get_loginuid(task)); |
99f89551 | 988 | put_task_struct(task); |
1da177e4 LT |
989 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); |
990 | } | |
991 | ||
992 | static ssize_t proc_loginuid_write(struct file * file, const char __user * buf, | |
993 | size_t count, loff_t *ppos) | |
994 | { | |
2fddfeef | 995 | struct inode * inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
996 | char *page, *tmp; |
997 | ssize_t length; | |
1da177e4 LT |
998 | uid_t loginuid; |
999 | ||
1000 | if (!capable(CAP_AUDIT_CONTROL)) | |
1001 | return -EPERM; | |
1002 | ||
13b41b09 | 1003 | if (current != pid_task(proc_pid(inode), PIDTYPE_PID)) |
1da177e4 LT |
1004 | return -EPERM; |
1005 | ||
e0182909 AV |
1006 | if (count >= PAGE_SIZE) |
1007 | count = PAGE_SIZE - 1; | |
1da177e4 LT |
1008 | |
1009 | if (*ppos != 0) { | |
1010 | /* No partial writes. */ | |
1011 | return -EINVAL; | |
1012 | } | |
e12ba74d | 1013 | page = (char*)__get_free_page(GFP_TEMPORARY); |
1da177e4 LT |
1014 | if (!page) |
1015 | return -ENOMEM; | |
1016 | length = -EFAULT; | |
1017 | if (copy_from_user(page, buf, count)) | |
1018 | goto out_free_page; | |
1019 | ||
e0182909 | 1020 | page[count] = '\0'; |
1da177e4 LT |
1021 | loginuid = simple_strtoul(page, &tmp, 10); |
1022 | if (tmp == page) { | |
1023 | length = -EINVAL; | |
1024 | goto out_free_page; | |
1025 | ||
1026 | } | |
99f89551 | 1027 | length = audit_set_loginuid(current, loginuid); |
1da177e4 LT |
1028 | if (likely(length == 0)) |
1029 | length = count; | |
1030 | ||
1031 | out_free_page: | |
1032 | free_page((unsigned long) page); | |
1033 | return length; | |
1034 | } | |
1035 | ||
00977a59 | 1036 | static const struct file_operations proc_loginuid_operations = { |
1da177e4 LT |
1037 | .read = proc_loginuid_read, |
1038 | .write = proc_loginuid_write, | |
1039 | }; | |
1040 | #endif | |
1041 | ||
f4f154fd AM |
1042 | #ifdef CONFIG_FAULT_INJECTION |
1043 | static ssize_t proc_fault_inject_read(struct file * file, char __user * buf, | |
1044 | size_t count, loff_t *ppos) | |
1045 | { | |
1046 | struct task_struct *task = get_proc_task(file->f_dentry->d_inode); | |
1047 | char buffer[PROC_NUMBUF]; | |
1048 | size_t len; | |
1049 | int make_it_fail; | |
f4f154fd AM |
1050 | |
1051 | if (!task) | |
1052 | return -ESRCH; | |
1053 | make_it_fail = task->make_it_fail; | |
1054 | put_task_struct(task); | |
1055 | ||
1056 | len = snprintf(buffer, sizeof(buffer), "%i\n", make_it_fail); | |
0c28f287 AM |
1057 | |
1058 | return simple_read_from_buffer(buf, count, ppos, buffer, len); | |
f4f154fd AM |
1059 | } |
1060 | ||
1061 | static ssize_t proc_fault_inject_write(struct file * file, | |
1062 | const char __user * buf, size_t count, loff_t *ppos) | |
1063 | { | |
1064 | struct task_struct *task; | |
1065 | char buffer[PROC_NUMBUF], *end; | |
1066 | int make_it_fail; | |
1067 | ||
1068 | if (!capable(CAP_SYS_RESOURCE)) | |
1069 | return -EPERM; | |
1070 | memset(buffer, 0, sizeof(buffer)); | |
1071 | if (count > sizeof(buffer) - 1) | |
1072 | count = sizeof(buffer) - 1; | |
1073 | if (copy_from_user(buffer, buf, count)) | |
1074 | return -EFAULT; | |
1075 | make_it_fail = simple_strtol(buffer, &end, 0); | |
1076 | if (*end == '\n') | |
1077 | end++; | |
1078 | task = get_proc_task(file->f_dentry->d_inode); | |
1079 | if (!task) | |
1080 | return -ESRCH; | |
1081 | task->make_it_fail = make_it_fail; | |
1082 | put_task_struct(task); | |
1083 | if (end - buffer == 0) | |
1084 | return -EIO; | |
1085 | return end - buffer; | |
1086 | } | |
1087 | ||
00977a59 | 1088 | static const struct file_operations proc_fault_inject_operations = { |
f4f154fd AM |
1089 | .read = proc_fault_inject_read, |
1090 | .write = proc_fault_inject_write, | |
1091 | }; | |
1092 | #endif | |
1093 | ||
9745512c | 1094 | |
43ae34cb IM |
1095 | #ifdef CONFIG_SCHED_DEBUG |
1096 | /* | |
1097 | * Print out various scheduling related per-task fields: | |
1098 | */ | |
1099 | static int sched_show(struct seq_file *m, void *v) | |
1100 | { | |
1101 | struct inode *inode = m->private; | |
1102 | struct task_struct *p; | |
1103 | ||
1104 | WARN_ON(!inode); | |
1105 | ||
1106 | p = get_proc_task(inode); | |
1107 | if (!p) | |
1108 | return -ESRCH; | |
1109 | proc_sched_show_task(p, m); | |
1110 | ||
1111 | put_task_struct(p); | |
1112 | ||
1113 | return 0; | |
1114 | } | |
1115 | ||
1116 | static ssize_t | |
1117 | sched_write(struct file *file, const char __user *buf, | |
1118 | size_t count, loff_t *offset) | |
1119 | { | |
1120 | struct inode *inode = file->f_path.dentry->d_inode; | |
1121 | struct task_struct *p; | |
1122 | ||
1123 | WARN_ON(!inode); | |
1124 | ||
1125 | p = get_proc_task(inode); | |
1126 | if (!p) | |
1127 | return -ESRCH; | |
1128 | proc_sched_set_task(p); | |
1129 | ||
1130 | put_task_struct(p); | |
1131 | ||
1132 | return count; | |
1133 | } | |
1134 | ||
1135 | static int sched_open(struct inode *inode, struct file *filp) | |
1136 | { | |
1137 | int ret; | |
1138 | ||
1139 | ret = single_open(filp, sched_show, NULL); | |
1140 | if (!ret) { | |
1141 | struct seq_file *m = filp->private_data; | |
1142 | ||
1143 | m->private = inode; | |
1144 | } | |
1145 | return ret; | |
1146 | } | |
1147 | ||
1148 | static const struct file_operations proc_pid_sched_operations = { | |
1149 | .open = sched_open, | |
1150 | .read = seq_read, | |
1151 | .write = sched_write, | |
1152 | .llseek = seq_lseek, | |
5ea473a1 | 1153 | .release = single_release, |
43ae34cb IM |
1154 | }; |
1155 | ||
1156 | #endif | |
1157 | ||
008b150a | 1158 | static void *proc_pid_follow_link(struct dentry *dentry, struct nameidata *nd) |
1da177e4 LT |
1159 | { |
1160 | struct inode *inode = dentry->d_inode; | |
1161 | int error = -EACCES; | |
1162 | ||
1163 | /* We don't need a base pointer in the /proc filesystem */ | |
1164 | path_release(nd); | |
1165 | ||
778c1144 EB |
1166 | /* Are we allowed to snoop on the tasks file descriptors? */ |
1167 | if (!proc_fd_access_allowed(inode)) | |
1da177e4 | 1168 | goto out; |
1da177e4 LT |
1169 | |
1170 | error = PROC_I(inode)->op.proc_get_link(inode, &nd->dentry, &nd->mnt); | |
1171 | nd->last_type = LAST_BIND; | |
1172 | out: | |
008b150a | 1173 | return ERR_PTR(error); |
1da177e4 LT |
1174 | } |
1175 | ||
1176 | static int do_proc_readlink(struct dentry *dentry, struct vfsmount *mnt, | |
1177 | char __user *buffer, int buflen) | |
1178 | { | |
1179 | struct inode * inode; | |
e12ba74d MG |
1180 | char *tmp = (char*)__get_free_page(GFP_TEMPORARY); |
1181 | char *path; | |
1da177e4 LT |
1182 | int len; |
1183 | ||
1184 | if (!tmp) | |
1185 | return -ENOMEM; | |
0c28f287 | 1186 | |
1da177e4 LT |
1187 | inode = dentry->d_inode; |
1188 | path = d_path(dentry, mnt, tmp, PAGE_SIZE); | |
1189 | len = PTR_ERR(path); | |
1190 | if (IS_ERR(path)) | |
1191 | goto out; | |
1192 | len = tmp + PAGE_SIZE - 1 - path; | |
1193 | ||
1194 | if (len > buflen) | |
1195 | len = buflen; | |
1196 | if (copy_to_user(buffer, path, len)) | |
1197 | len = -EFAULT; | |
1198 | out: | |
1199 | free_page((unsigned long)tmp); | |
1200 | return len; | |
1201 | } | |
1202 | ||
1203 | static int proc_pid_readlink(struct dentry * dentry, char __user * buffer, int buflen) | |
1204 | { | |
1205 | int error = -EACCES; | |
1206 | struct inode *inode = dentry->d_inode; | |
1207 | struct dentry *de; | |
1208 | struct vfsmount *mnt = NULL; | |
1209 | ||
778c1144 EB |
1210 | /* Are we allowed to snoop on the tasks file descriptors? */ |
1211 | if (!proc_fd_access_allowed(inode)) | |
1da177e4 | 1212 | goto out; |
1da177e4 LT |
1213 | |
1214 | error = PROC_I(inode)->op.proc_get_link(inode, &de, &mnt); | |
1215 | if (error) | |
1216 | goto out; | |
1217 | ||
1218 | error = do_proc_readlink(de, mnt, buffer, buflen); | |
1219 | dput(de); | |
1220 | mntput(mnt); | |
1221 | out: | |
1da177e4 LT |
1222 | return error; |
1223 | } | |
1224 | ||
c5ef1c42 | 1225 | static const struct inode_operations proc_pid_link_inode_operations = { |
1da177e4 | 1226 | .readlink = proc_pid_readlink, |
6d76fa58 LT |
1227 | .follow_link = proc_pid_follow_link, |
1228 | .setattr = proc_setattr, | |
1da177e4 LT |
1229 | }; |
1230 | ||
28a6d671 EB |
1231 | |
1232 | /* building an inode */ | |
1233 | ||
1234 | static int task_dumpable(struct task_struct *task) | |
1da177e4 | 1235 | { |
28a6d671 EB |
1236 | int dumpable = 0; |
1237 | struct mm_struct *mm; | |
1da177e4 | 1238 | |
28a6d671 EB |
1239 | task_lock(task); |
1240 | mm = task->mm; | |
1241 | if (mm) | |
6c5d5238 | 1242 | dumpable = get_dumpable(mm); |
28a6d671 EB |
1243 | task_unlock(task); |
1244 | if(dumpable == 1) | |
1245 | return 1; | |
1246 | return 0; | |
1247 | } | |
1da177e4 | 1248 | |
1da177e4 | 1249 | |
61a28784 | 1250 | static struct inode *proc_pid_make_inode(struct super_block * sb, struct task_struct *task) |
28a6d671 EB |
1251 | { |
1252 | struct inode * inode; | |
1253 | struct proc_inode *ei; | |
1da177e4 | 1254 | |
28a6d671 | 1255 | /* We need a new inode */ |
1da177e4 | 1256 | |
28a6d671 EB |
1257 | inode = new_inode(sb); |
1258 | if (!inode) | |
1259 | goto out; | |
1260 | ||
1261 | /* Common stuff */ | |
1262 | ei = PROC_I(inode); | |
1263 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; | |
28a6d671 EB |
1264 | inode->i_op = &proc_def_inode_operations; |
1265 | ||
1266 | /* | |
1267 | * grab the reference to task. | |
1268 | */ | |
1a657f78 | 1269 | ei->pid = get_task_pid(task, PIDTYPE_PID); |
28a6d671 EB |
1270 | if (!ei->pid) |
1271 | goto out_unlock; | |
1272 | ||
1273 | inode->i_uid = 0; | |
1274 | inode->i_gid = 0; | |
1275 | if (task_dumpable(task)) { | |
1276 | inode->i_uid = task->euid; | |
1277 | inode->i_gid = task->egid; | |
1da177e4 | 1278 | } |
28a6d671 EB |
1279 | security_task_to_inode(task, inode); |
1280 | ||
1da177e4 | 1281 | out: |
28a6d671 EB |
1282 | return inode; |
1283 | ||
1284 | out_unlock: | |
1285 | iput(inode); | |
1286 | return NULL; | |
1da177e4 LT |
1287 | } |
1288 | ||
28a6d671 | 1289 | static int pid_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) |
1da177e4 | 1290 | { |
1da177e4 | 1291 | struct inode *inode = dentry->d_inode; |
28a6d671 EB |
1292 | struct task_struct *task; |
1293 | generic_fillattr(inode, stat); | |
1da177e4 | 1294 | |
28a6d671 EB |
1295 | rcu_read_lock(); |
1296 | stat->uid = 0; | |
1297 | stat->gid = 0; | |
1298 | task = pid_task(proc_pid(inode), PIDTYPE_PID); | |
1299 | if (task) { | |
1300 | if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) || | |
1301 | task_dumpable(task)) { | |
1302 | stat->uid = task->euid; | |
1303 | stat->gid = task->egid; | |
1da177e4 LT |
1304 | } |
1305 | } | |
28a6d671 | 1306 | rcu_read_unlock(); |
d6e71144 | 1307 | return 0; |
1da177e4 LT |
1308 | } |
1309 | ||
1da177e4 LT |
1310 | /* dentry stuff */ |
1311 | ||
1312 | /* | |
1313 | * Exceptional case: normally we are not allowed to unhash a busy | |
1314 | * directory. In this case, however, we can do it - no aliasing problems | |
1315 | * due to the way we treat inodes. | |
1316 | * | |
1317 | * Rewrite the inode's ownerships here because the owning task may have | |
1318 | * performed a setuid(), etc. | |
99f89551 EB |
1319 | * |
1320 | * Before the /proc/pid/status file was created the only way to read | |
1321 | * the effective uid of a /process was to stat /proc/pid. Reading | |
1322 | * /proc/pid/status is slow enough that procps and other packages | |
1323 | * kept stating /proc/pid. To keep the rules in /proc simple I have | |
1324 | * made this apply to all per process world readable and executable | |
1325 | * directories. | |
1da177e4 LT |
1326 | */ |
1327 | static int pid_revalidate(struct dentry *dentry, struct nameidata *nd) | |
1328 | { | |
1329 | struct inode *inode = dentry->d_inode; | |
99f89551 EB |
1330 | struct task_struct *task = get_proc_task(inode); |
1331 | if (task) { | |
1332 | if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) || | |
1333 | task_dumpable(task)) { | |
1da177e4 LT |
1334 | inode->i_uid = task->euid; |
1335 | inode->i_gid = task->egid; | |
1336 | } else { | |
1337 | inode->i_uid = 0; | |
1338 | inode->i_gid = 0; | |
1339 | } | |
9ee8ab9f | 1340 | inode->i_mode &= ~(S_ISUID | S_ISGID); |
1da177e4 | 1341 | security_task_to_inode(task, inode); |
99f89551 | 1342 | put_task_struct(task); |
1da177e4 LT |
1343 | return 1; |
1344 | } | |
1345 | d_drop(dentry); | |
1346 | return 0; | |
1347 | } | |
1348 | ||
28a6d671 | 1349 | static int pid_delete_dentry(struct dentry * dentry) |
99f89551 | 1350 | { |
28a6d671 EB |
1351 | /* Is the task we represent dead? |
1352 | * If so, then don't put the dentry on the lru list, | |
1353 | * kill it immediately. | |
1354 | */ | |
1355 | return !proc_pid(dentry->d_inode)->tasks[PIDTYPE_PID].first; | |
1356 | } | |
1357 | ||
1358 | static struct dentry_operations pid_dentry_operations = | |
1359 | { | |
1360 | .d_revalidate = pid_revalidate, | |
1361 | .d_delete = pid_delete_dentry, | |
1362 | }; | |
1363 | ||
1364 | /* Lookups */ | |
1365 | ||
c5141e6d ED |
1366 | typedef struct dentry *instantiate_t(struct inode *, struct dentry *, |
1367 | struct task_struct *, const void *); | |
61a28784 | 1368 | |
1c0d04c9 EB |
1369 | /* |
1370 | * Fill a directory entry. | |
1371 | * | |
1372 | * If possible create the dcache entry and derive our inode number and | |
1373 | * file type from dcache entry. | |
1374 | * | |
1375 | * Since all of the proc inode numbers are dynamically generated, the inode | |
1376 | * numbers do not exist until the inode is cache. This means creating the | |
1377 | * the dcache entry in readdir is necessary to keep the inode numbers | |
1378 | * reported by readdir in sync with the inode numbers reported | |
1379 | * by stat. | |
1380 | */ | |
61a28784 EB |
1381 | static int proc_fill_cache(struct file *filp, void *dirent, filldir_t filldir, |
1382 | char *name, int len, | |
c5141e6d | 1383 | instantiate_t instantiate, struct task_struct *task, const void *ptr) |
61a28784 | 1384 | { |
2fddfeef | 1385 | struct dentry *child, *dir = filp->f_path.dentry; |
61a28784 EB |
1386 | struct inode *inode; |
1387 | struct qstr qname; | |
1388 | ino_t ino = 0; | |
1389 | unsigned type = DT_UNKNOWN; | |
1390 | ||
1391 | qname.name = name; | |
1392 | qname.len = len; | |
1393 | qname.hash = full_name_hash(name, len); | |
1394 | ||
1395 | child = d_lookup(dir, &qname); | |
1396 | if (!child) { | |
1397 | struct dentry *new; | |
1398 | new = d_alloc(dir, &qname); | |
1399 | if (new) { | |
1400 | child = instantiate(dir->d_inode, new, task, ptr); | |
1401 | if (child) | |
1402 | dput(new); | |
1403 | else | |
1404 | child = new; | |
1405 | } | |
1406 | } | |
1407 | if (!child || IS_ERR(child) || !child->d_inode) | |
1408 | goto end_instantiate; | |
1409 | inode = child->d_inode; | |
1410 | if (inode) { | |
1411 | ino = inode->i_ino; | |
1412 | type = inode->i_mode >> 12; | |
1413 | } | |
1414 | dput(child); | |
1415 | end_instantiate: | |
1416 | if (!ino) | |
1417 | ino = find_inode_number(dir, &qname); | |
1418 | if (!ino) | |
1419 | ino = 1; | |
1420 | return filldir(dirent, name, len, filp->f_pos, ino, type); | |
1421 | } | |
1422 | ||
28a6d671 EB |
1423 | static unsigned name_to_int(struct dentry *dentry) |
1424 | { | |
1425 | const char *name = dentry->d_name.name; | |
1426 | int len = dentry->d_name.len; | |
1427 | unsigned n = 0; | |
1428 | ||
1429 | if (len > 1 && *name == '0') | |
1430 | goto out; | |
1431 | while (len-- > 0) { | |
1432 | unsigned c = *name++ - '0'; | |
1433 | if (c > 9) | |
1434 | goto out; | |
1435 | if (n >= (~0U-9)/10) | |
1436 | goto out; | |
1437 | n *= 10; | |
1438 | n += c; | |
1439 | } | |
1440 | return n; | |
1441 | out: | |
1442 | return ~0U; | |
1443 | } | |
1444 | ||
27932742 MS |
1445 | #define PROC_FDINFO_MAX 64 |
1446 | ||
1447 | static int proc_fd_info(struct inode *inode, struct dentry **dentry, | |
1448 | struct vfsmount **mnt, char *info) | |
28a6d671 EB |
1449 | { |
1450 | struct task_struct *task = get_proc_task(inode); | |
1451 | struct files_struct *files = NULL; | |
1452 | struct file *file; | |
1453 | int fd = proc_fd(inode); | |
99f89551 | 1454 | |
99f89551 | 1455 | if (task) { |
28a6d671 EB |
1456 | files = get_files_struct(task); |
1457 | put_task_struct(task); | |
1458 | } | |
1459 | if (files) { | |
1460 | /* | |
1461 | * We are not taking a ref to the file structure, so we must | |
1462 | * hold ->file_lock. | |
1463 | */ | |
1464 | spin_lock(&files->file_lock); | |
1465 | file = fcheck_files(files, fd); | |
1466 | if (file) { | |
27932742 MS |
1467 | if (mnt) |
1468 | *mnt = mntget(file->f_path.mnt); | |
1469 | if (dentry) | |
1470 | *dentry = dget(file->f_path.dentry); | |
1471 | if (info) | |
1472 | snprintf(info, PROC_FDINFO_MAX, | |
1473 | "pos:\t%lli\n" | |
1474 | "flags:\t0%o\n", | |
1475 | (long long) file->f_pos, | |
1476 | file->f_flags); | |
28a6d671 EB |
1477 | spin_unlock(&files->file_lock); |
1478 | put_files_struct(files); | |
1479 | return 0; | |
99f89551 | 1480 | } |
28a6d671 EB |
1481 | spin_unlock(&files->file_lock); |
1482 | put_files_struct(files); | |
99f89551 | 1483 | } |
28a6d671 | 1484 | return -ENOENT; |
99f89551 EB |
1485 | } |
1486 | ||
27932742 MS |
1487 | static int proc_fd_link(struct inode *inode, struct dentry **dentry, |
1488 | struct vfsmount **mnt) | |
1489 | { | |
1490 | return proc_fd_info(inode, dentry, mnt, NULL); | |
1491 | } | |
1492 | ||
1da177e4 LT |
1493 | static int tid_fd_revalidate(struct dentry *dentry, struct nameidata *nd) |
1494 | { | |
1495 | struct inode *inode = dentry->d_inode; | |
99f89551 | 1496 | struct task_struct *task = get_proc_task(inode); |
aed7a6c4 | 1497 | int fd = proc_fd(inode); |
1da177e4 LT |
1498 | struct files_struct *files; |
1499 | ||
99f89551 EB |
1500 | if (task) { |
1501 | files = get_files_struct(task); | |
1502 | if (files) { | |
1503 | rcu_read_lock(); | |
1504 | if (fcheck_files(files, fd)) { | |
1505 | rcu_read_unlock(); | |
1506 | put_files_struct(files); | |
1507 | if (task_dumpable(task)) { | |
1508 | inode->i_uid = task->euid; | |
1509 | inode->i_gid = task->egid; | |
1510 | } else { | |
1511 | inode->i_uid = 0; | |
1512 | inode->i_gid = 0; | |
1513 | } | |
9ee8ab9f | 1514 | inode->i_mode &= ~(S_ISUID | S_ISGID); |
99f89551 EB |
1515 | security_task_to_inode(task, inode); |
1516 | put_task_struct(task); | |
1517 | return 1; | |
1518 | } | |
b835996f | 1519 | rcu_read_unlock(); |
1da177e4 | 1520 | put_files_struct(files); |
1da177e4 | 1521 | } |
99f89551 | 1522 | put_task_struct(task); |
1da177e4 LT |
1523 | } |
1524 | d_drop(dentry); | |
1525 | return 0; | |
1526 | } | |
1527 | ||
1da177e4 LT |
1528 | static struct dentry_operations tid_fd_dentry_operations = |
1529 | { | |
1530 | .d_revalidate = tid_fd_revalidate, | |
1531 | .d_delete = pid_delete_dentry, | |
1532 | }; | |
1533 | ||
444ceed8 | 1534 | static struct dentry *proc_fd_instantiate(struct inode *dir, |
c5141e6d | 1535 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
1da177e4 | 1536 | { |
c5141e6d | 1537 | unsigned fd = *(const unsigned *)ptr; |
444ceed8 EB |
1538 | struct file *file; |
1539 | struct files_struct *files; | |
1540 | struct inode *inode; | |
1541 | struct proc_inode *ei; | |
1542 | struct dentry *error = ERR_PTR(-ENOENT); | |
1da177e4 | 1543 | |
61a28784 | 1544 | inode = proc_pid_make_inode(dir->i_sb, task); |
1da177e4 LT |
1545 | if (!inode) |
1546 | goto out; | |
1547 | ei = PROC_I(inode); | |
aed7a6c4 | 1548 | ei->fd = fd; |
1da177e4 LT |
1549 | files = get_files_struct(task); |
1550 | if (!files) | |
444ceed8 | 1551 | goto out_iput; |
1da177e4 | 1552 | inode->i_mode = S_IFLNK; |
ca99c1da DS |
1553 | |
1554 | /* | |
1555 | * We are not taking a ref to the file structure, so we must | |
1556 | * hold ->file_lock. | |
1557 | */ | |
1558 | spin_lock(&files->file_lock); | |
1da177e4 LT |
1559 | file = fcheck_files(files, fd); |
1560 | if (!file) | |
444ceed8 | 1561 | goto out_unlock; |
1da177e4 LT |
1562 | if (file->f_mode & 1) |
1563 | inode->i_mode |= S_IRUSR | S_IXUSR; | |
1564 | if (file->f_mode & 2) | |
1565 | inode->i_mode |= S_IWUSR | S_IXUSR; | |
ca99c1da | 1566 | spin_unlock(&files->file_lock); |
1da177e4 | 1567 | put_files_struct(files); |
444ceed8 | 1568 | |
1da177e4 LT |
1569 | inode->i_op = &proc_pid_link_inode_operations; |
1570 | inode->i_size = 64; | |
1571 | ei->op.proc_get_link = proc_fd_link; | |
1572 | dentry->d_op = &tid_fd_dentry_operations; | |
1573 | d_add(dentry, inode); | |
cd6a3ce9 EB |
1574 | /* Close the race of the process dying before we return the dentry */ |
1575 | if (tid_fd_revalidate(dentry, NULL)) | |
444ceed8 | 1576 | error = NULL; |
1da177e4 | 1577 | |
444ceed8 EB |
1578 | out: |
1579 | return error; | |
1580 | out_unlock: | |
ca99c1da | 1581 | spin_unlock(&files->file_lock); |
1da177e4 | 1582 | put_files_struct(files); |
444ceed8 | 1583 | out_iput: |
1da177e4 | 1584 | iput(inode); |
cd6a3ce9 | 1585 | goto out; |
1da177e4 LT |
1586 | } |
1587 | ||
27932742 MS |
1588 | static struct dentry *proc_lookupfd_common(struct inode *dir, |
1589 | struct dentry *dentry, | |
1590 | instantiate_t instantiate) | |
444ceed8 EB |
1591 | { |
1592 | struct task_struct *task = get_proc_task(dir); | |
1593 | unsigned fd = name_to_int(dentry); | |
1594 | struct dentry *result = ERR_PTR(-ENOENT); | |
1595 | ||
1596 | if (!task) | |
1597 | goto out_no_task; | |
1598 | if (fd == ~0U) | |
1599 | goto out; | |
1600 | ||
27932742 | 1601 | result = instantiate(dir, dentry, task, &fd); |
444ceed8 EB |
1602 | out: |
1603 | put_task_struct(task); | |
1604 | out_no_task: | |
1605 | return result; | |
1606 | } | |
1607 | ||
27932742 MS |
1608 | static int proc_readfd_common(struct file * filp, void * dirent, |
1609 | filldir_t filldir, instantiate_t instantiate) | |
28a6d671 | 1610 | { |
2fddfeef | 1611 | struct dentry *dentry = filp->f_path.dentry; |
28a6d671 EB |
1612 | struct inode *inode = dentry->d_inode; |
1613 | struct task_struct *p = get_proc_task(inode); | |
457c2510 | 1614 | unsigned int fd, ino; |
28a6d671 | 1615 | int retval; |
28a6d671 EB |
1616 | struct files_struct * files; |
1617 | struct fdtable *fdt; | |
1da177e4 | 1618 | |
28a6d671 EB |
1619 | retval = -ENOENT; |
1620 | if (!p) | |
1621 | goto out_no_task; | |
1622 | retval = 0; | |
28a6d671 EB |
1623 | |
1624 | fd = filp->f_pos; | |
1625 | switch (fd) { | |
1626 | case 0: | |
1627 | if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0) | |
1628 | goto out; | |
1629 | filp->f_pos++; | |
1630 | case 1: | |
1631 | ino = parent_ino(dentry); | |
1632 | if (filldir(dirent, "..", 2, 1, ino, DT_DIR) < 0) | |
1633 | goto out; | |
1634 | filp->f_pos++; | |
1635 | default: | |
1636 | files = get_files_struct(p); | |
1637 | if (!files) | |
1638 | goto out; | |
1639 | rcu_read_lock(); | |
1640 | fdt = files_fdtable(files); | |
1641 | for (fd = filp->f_pos-2; | |
1642 | fd < fdt->max_fds; | |
1643 | fd++, filp->f_pos++) { | |
27932742 MS |
1644 | char name[PROC_NUMBUF]; |
1645 | int len; | |
28a6d671 EB |
1646 | |
1647 | if (!fcheck_files(files, fd)) | |
1648 | continue; | |
1649 | rcu_read_unlock(); | |
1650 | ||
27932742 MS |
1651 | len = snprintf(name, sizeof(name), "%d", fd); |
1652 | if (proc_fill_cache(filp, dirent, filldir, | |
1653 | name, len, instantiate, | |
1654 | p, &fd) < 0) { | |
28a6d671 EB |
1655 | rcu_read_lock(); |
1656 | break; | |
1657 | } | |
1658 | rcu_read_lock(); | |
1659 | } | |
1660 | rcu_read_unlock(); | |
1661 | put_files_struct(files); | |
1662 | } | |
1663 | out: | |
1664 | put_task_struct(p); | |
1665 | out_no_task: | |
1666 | return retval; | |
1667 | } | |
1668 | ||
27932742 MS |
1669 | static struct dentry *proc_lookupfd(struct inode *dir, struct dentry *dentry, |
1670 | struct nameidata *nd) | |
1671 | { | |
1672 | return proc_lookupfd_common(dir, dentry, proc_fd_instantiate); | |
1673 | } | |
1674 | ||
1675 | static int proc_readfd(struct file *filp, void *dirent, filldir_t filldir) | |
1676 | { | |
1677 | return proc_readfd_common(filp, dirent, filldir, proc_fd_instantiate); | |
1678 | } | |
1679 | ||
1680 | static ssize_t proc_fdinfo_read(struct file *file, char __user *buf, | |
1681 | size_t len, loff_t *ppos) | |
1682 | { | |
1683 | char tmp[PROC_FDINFO_MAX]; | |
1684 | int err = proc_fd_info(file->f_path.dentry->d_inode, NULL, NULL, tmp); | |
1685 | if (!err) | |
1686 | err = simple_read_from_buffer(buf, len, ppos, tmp, strlen(tmp)); | |
1687 | return err; | |
1688 | } | |
1689 | ||
1690 | static const struct file_operations proc_fdinfo_file_operations = { | |
1691 | .open = nonseekable_open, | |
1692 | .read = proc_fdinfo_read, | |
1693 | }; | |
1694 | ||
00977a59 | 1695 | static const struct file_operations proc_fd_operations = { |
28a6d671 EB |
1696 | .read = generic_read_dir, |
1697 | .readdir = proc_readfd, | |
1da177e4 LT |
1698 | }; |
1699 | ||
8948e11f AD |
1700 | /* |
1701 | * /proc/pid/fd needs a special permission handler so that a process can still | |
1702 | * access /proc/self/fd after it has executed a setuid(). | |
1703 | */ | |
1704 | static int proc_fd_permission(struct inode *inode, int mask, | |
1705 | struct nameidata *nd) | |
1706 | { | |
1707 | int rv; | |
1708 | ||
1709 | rv = generic_permission(inode, mask, NULL); | |
1710 | if (rv == 0) | |
1711 | return 0; | |
1712 | if (task_pid(current) == proc_pid(inode)) | |
1713 | rv = 0; | |
1714 | return rv; | |
1715 | } | |
1716 | ||
1da177e4 LT |
1717 | /* |
1718 | * proc directories can do almost nothing.. | |
1719 | */ | |
c5ef1c42 | 1720 | static const struct inode_operations proc_fd_inode_operations = { |
1da177e4 | 1721 | .lookup = proc_lookupfd, |
8948e11f | 1722 | .permission = proc_fd_permission, |
6d76fa58 | 1723 | .setattr = proc_setattr, |
1da177e4 LT |
1724 | }; |
1725 | ||
27932742 MS |
1726 | static struct dentry *proc_fdinfo_instantiate(struct inode *dir, |
1727 | struct dentry *dentry, struct task_struct *task, const void *ptr) | |
1728 | { | |
1729 | unsigned fd = *(unsigned *)ptr; | |
1730 | struct inode *inode; | |
1731 | struct proc_inode *ei; | |
1732 | struct dentry *error = ERR_PTR(-ENOENT); | |
1733 | ||
1734 | inode = proc_pid_make_inode(dir->i_sb, task); | |
1735 | if (!inode) | |
1736 | goto out; | |
1737 | ei = PROC_I(inode); | |
1738 | ei->fd = fd; | |
1739 | inode->i_mode = S_IFREG | S_IRUSR; | |
1740 | inode->i_fop = &proc_fdinfo_file_operations; | |
1741 | dentry->d_op = &tid_fd_dentry_operations; | |
1742 | d_add(dentry, inode); | |
1743 | /* Close the race of the process dying before we return the dentry */ | |
1744 | if (tid_fd_revalidate(dentry, NULL)) | |
1745 | error = NULL; | |
1746 | ||
1747 | out: | |
1748 | return error; | |
1749 | } | |
1750 | ||
1751 | static struct dentry *proc_lookupfdinfo(struct inode *dir, | |
1752 | struct dentry *dentry, | |
1753 | struct nameidata *nd) | |
1754 | { | |
1755 | return proc_lookupfd_common(dir, dentry, proc_fdinfo_instantiate); | |
1756 | } | |
1757 | ||
1758 | static int proc_readfdinfo(struct file *filp, void *dirent, filldir_t filldir) | |
1759 | { | |
1760 | return proc_readfd_common(filp, dirent, filldir, | |
1761 | proc_fdinfo_instantiate); | |
1762 | } | |
1763 | ||
1764 | static const struct file_operations proc_fdinfo_operations = { | |
1765 | .read = generic_read_dir, | |
1766 | .readdir = proc_readfdinfo, | |
1767 | }; | |
1768 | ||
1769 | /* | |
1770 | * proc directories can do almost nothing.. | |
1771 | */ | |
1772 | static const struct inode_operations proc_fdinfo_inode_operations = { | |
1773 | .lookup = proc_lookupfdinfo, | |
1774 | .setattr = proc_setattr, | |
1775 | }; | |
1776 | ||
1777 | ||
444ceed8 | 1778 | static struct dentry *proc_pident_instantiate(struct inode *dir, |
c5141e6d | 1779 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
444ceed8 | 1780 | { |
c5141e6d | 1781 | const struct pid_entry *p = ptr; |
444ceed8 EB |
1782 | struct inode *inode; |
1783 | struct proc_inode *ei; | |
1784 | struct dentry *error = ERR_PTR(-EINVAL); | |
1785 | ||
61a28784 | 1786 | inode = proc_pid_make_inode(dir->i_sb, task); |
444ceed8 EB |
1787 | if (!inode) |
1788 | goto out; | |
1789 | ||
1790 | ei = PROC_I(inode); | |
1791 | inode->i_mode = p->mode; | |
1792 | if (S_ISDIR(inode->i_mode)) | |
1793 | inode->i_nlink = 2; /* Use getattr to fix if necessary */ | |
1794 | if (p->iop) | |
1795 | inode->i_op = p->iop; | |
1796 | if (p->fop) | |
1797 | inode->i_fop = p->fop; | |
1798 | ei->op = p->op; | |
1799 | dentry->d_op = &pid_dentry_operations; | |
1800 | d_add(dentry, inode); | |
1801 | /* Close the race of the process dying before we return the dentry */ | |
1802 | if (pid_revalidate(dentry, NULL)) | |
1803 | error = NULL; | |
1804 | out: | |
1805 | return error; | |
1806 | } | |
1807 | ||
1da177e4 LT |
1808 | static struct dentry *proc_pident_lookup(struct inode *dir, |
1809 | struct dentry *dentry, | |
c5141e6d | 1810 | const struct pid_entry *ents, |
7bcd6b0e | 1811 | unsigned int nents) |
1da177e4 LT |
1812 | { |
1813 | struct inode *inode; | |
cd6a3ce9 | 1814 | struct dentry *error; |
99f89551 | 1815 | struct task_struct *task = get_proc_task(dir); |
c5141e6d | 1816 | const struct pid_entry *p, *last; |
1da177e4 | 1817 | |
cd6a3ce9 | 1818 | error = ERR_PTR(-ENOENT); |
1da177e4 LT |
1819 | inode = NULL; |
1820 | ||
99f89551 EB |
1821 | if (!task) |
1822 | goto out_no_task; | |
1da177e4 | 1823 | |
20cdc894 EB |
1824 | /* |
1825 | * Yes, it does not scale. And it should not. Don't add | |
1826 | * new entries into /proc/<tgid>/ without very good reasons. | |
1827 | */ | |
7bcd6b0e EB |
1828 | last = &ents[nents - 1]; |
1829 | for (p = ents; p <= last; p++) { | |
1da177e4 LT |
1830 | if (p->len != dentry->d_name.len) |
1831 | continue; | |
1832 | if (!memcmp(dentry->d_name.name, p->name, p->len)) | |
1833 | break; | |
1834 | } | |
7bcd6b0e | 1835 | if (p > last) |
1da177e4 LT |
1836 | goto out; |
1837 | ||
444ceed8 | 1838 | error = proc_pident_instantiate(dir, dentry, task, p); |
1da177e4 | 1839 | out: |
99f89551 EB |
1840 | put_task_struct(task); |
1841 | out_no_task: | |
cd6a3ce9 | 1842 | return error; |
1da177e4 LT |
1843 | } |
1844 | ||
c5141e6d ED |
1845 | static int proc_pident_fill_cache(struct file *filp, void *dirent, |
1846 | filldir_t filldir, struct task_struct *task, const struct pid_entry *p) | |
61a28784 EB |
1847 | { |
1848 | return proc_fill_cache(filp, dirent, filldir, p->name, p->len, | |
1849 | proc_pident_instantiate, task, p); | |
1850 | } | |
1851 | ||
28a6d671 EB |
1852 | static int proc_pident_readdir(struct file *filp, |
1853 | void *dirent, filldir_t filldir, | |
c5141e6d | 1854 | const struct pid_entry *ents, unsigned int nents) |
28a6d671 EB |
1855 | { |
1856 | int i; | |
2fddfeef | 1857 | struct dentry *dentry = filp->f_path.dentry; |
28a6d671 EB |
1858 | struct inode *inode = dentry->d_inode; |
1859 | struct task_struct *task = get_proc_task(inode); | |
c5141e6d | 1860 | const struct pid_entry *p, *last; |
28a6d671 EB |
1861 | ino_t ino; |
1862 | int ret; | |
1863 | ||
1864 | ret = -ENOENT; | |
1865 | if (!task) | |
61a28784 | 1866 | goto out_no_task; |
28a6d671 EB |
1867 | |
1868 | ret = 0; | |
28a6d671 EB |
1869 | i = filp->f_pos; |
1870 | switch (i) { | |
1871 | case 0: | |
1872 | ino = inode->i_ino; | |
1873 | if (filldir(dirent, ".", 1, i, ino, DT_DIR) < 0) | |
1874 | goto out; | |
1875 | i++; | |
1876 | filp->f_pos++; | |
1877 | /* fall through */ | |
1878 | case 1: | |
1879 | ino = parent_ino(dentry); | |
1880 | if (filldir(dirent, "..", 2, i, ino, DT_DIR) < 0) | |
1881 | goto out; | |
1882 | i++; | |
1883 | filp->f_pos++; | |
1884 | /* fall through */ | |
1885 | default: | |
1886 | i -= 2; | |
1887 | if (i >= nents) { | |
1888 | ret = 1; | |
1889 | goto out; | |
1890 | } | |
1891 | p = ents + i; | |
7bcd6b0e EB |
1892 | last = &ents[nents - 1]; |
1893 | while (p <= last) { | |
61a28784 | 1894 | if (proc_pident_fill_cache(filp, dirent, filldir, task, p) < 0) |
28a6d671 EB |
1895 | goto out; |
1896 | filp->f_pos++; | |
1897 | p++; | |
1898 | } | |
1899 | } | |
1900 | ||
1901 | ret = 1; | |
1902 | out: | |
61a28784 EB |
1903 | put_task_struct(task); |
1904 | out_no_task: | |
28a6d671 | 1905 | return ret; |
1da177e4 LT |
1906 | } |
1907 | ||
28a6d671 EB |
1908 | #ifdef CONFIG_SECURITY |
1909 | static ssize_t proc_pid_attr_read(struct file * file, char __user * buf, | |
1910 | size_t count, loff_t *ppos) | |
1911 | { | |
2fddfeef | 1912 | struct inode * inode = file->f_path.dentry->d_inode; |
04ff9708 | 1913 | char *p = NULL; |
28a6d671 EB |
1914 | ssize_t length; |
1915 | struct task_struct *task = get_proc_task(inode); | |
1916 | ||
28a6d671 | 1917 | if (!task) |
04ff9708 | 1918 | return -ESRCH; |
28a6d671 EB |
1919 | |
1920 | length = security_getprocattr(task, | |
2fddfeef | 1921 | (char*)file->f_path.dentry->d_name.name, |
04ff9708 | 1922 | &p); |
28a6d671 | 1923 | put_task_struct(task); |
04ff9708 AV |
1924 | if (length > 0) |
1925 | length = simple_read_from_buffer(buf, count, ppos, p, length); | |
1926 | kfree(p); | |
28a6d671 | 1927 | return length; |
1da177e4 LT |
1928 | } |
1929 | ||
28a6d671 EB |
1930 | static ssize_t proc_pid_attr_write(struct file * file, const char __user * buf, |
1931 | size_t count, loff_t *ppos) | |
1932 | { | |
2fddfeef | 1933 | struct inode * inode = file->f_path.dentry->d_inode; |
28a6d671 EB |
1934 | char *page; |
1935 | ssize_t length; | |
1936 | struct task_struct *task = get_proc_task(inode); | |
1937 | ||
1938 | length = -ESRCH; | |
1939 | if (!task) | |
1940 | goto out_no_task; | |
1941 | if (count > PAGE_SIZE) | |
1942 | count = PAGE_SIZE; | |
1943 | ||
1944 | /* No partial writes. */ | |
1945 | length = -EINVAL; | |
1946 | if (*ppos != 0) | |
1947 | goto out; | |
1948 | ||
1949 | length = -ENOMEM; | |
e12ba74d | 1950 | page = (char*)__get_free_page(GFP_TEMPORARY); |
28a6d671 EB |
1951 | if (!page) |
1952 | goto out; | |
1953 | ||
1954 | length = -EFAULT; | |
1955 | if (copy_from_user(page, buf, count)) | |
1956 | goto out_free; | |
1957 | ||
1958 | length = security_setprocattr(task, | |
2fddfeef | 1959 | (char*)file->f_path.dentry->d_name.name, |
28a6d671 EB |
1960 | (void*)page, count); |
1961 | out_free: | |
1962 | free_page((unsigned long) page); | |
1963 | out: | |
1964 | put_task_struct(task); | |
1965 | out_no_task: | |
1966 | return length; | |
1967 | } | |
1968 | ||
00977a59 | 1969 | static const struct file_operations proc_pid_attr_operations = { |
28a6d671 EB |
1970 | .read = proc_pid_attr_read, |
1971 | .write = proc_pid_attr_write, | |
1972 | }; | |
1973 | ||
c5141e6d | 1974 | static const struct pid_entry attr_dir_stuff[] = { |
61a28784 EB |
1975 | REG("current", S_IRUGO|S_IWUGO, pid_attr), |
1976 | REG("prev", S_IRUGO, pid_attr), | |
1977 | REG("exec", S_IRUGO|S_IWUGO, pid_attr), | |
1978 | REG("fscreate", S_IRUGO|S_IWUGO, pid_attr), | |
1979 | REG("keycreate", S_IRUGO|S_IWUGO, pid_attr), | |
1980 | REG("sockcreate", S_IRUGO|S_IWUGO, pid_attr), | |
28a6d671 EB |
1981 | }; |
1982 | ||
72d9dcfc | 1983 | static int proc_attr_dir_readdir(struct file * filp, |
28a6d671 EB |
1984 | void * dirent, filldir_t filldir) |
1985 | { | |
1986 | return proc_pident_readdir(filp,dirent,filldir, | |
72d9dcfc | 1987 | attr_dir_stuff,ARRAY_SIZE(attr_dir_stuff)); |
28a6d671 EB |
1988 | } |
1989 | ||
00977a59 | 1990 | static const struct file_operations proc_attr_dir_operations = { |
1da177e4 | 1991 | .read = generic_read_dir, |
72d9dcfc | 1992 | .readdir = proc_attr_dir_readdir, |
1da177e4 LT |
1993 | }; |
1994 | ||
72d9dcfc | 1995 | static struct dentry *proc_attr_dir_lookup(struct inode *dir, |
28a6d671 EB |
1996 | struct dentry *dentry, struct nameidata *nd) |
1997 | { | |
7bcd6b0e EB |
1998 | return proc_pident_lookup(dir, dentry, |
1999 | attr_dir_stuff, ARRAY_SIZE(attr_dir_stuff)); | |
28a6d671 EB |
2000 | } |
2001 | ||
c5ef1c42 | 2002 | static const struct inode_operations proc_attr_dir_inode_operations = { |
72d9dcfc | 2003 | .lookup = proc_attr_dir_lookup, |
99f89551 | 2004 | .getattr = pid_getattr, |
6d76fa58 | 2005 | .setattr = proc_setattr, |
1da177e4 LT |
2006 | }; |
2007 | ||
28a6d671 EB |
2008 | #endif |
2009 | ||
3cb4a0bb KH |
2010 | #if defined(USE_ELF_CORE_DUMP) && defined(CONFIG_ELF_CORE) |
2011 | static ssize_t proc_coredump_filter_read(struct file *file, char __user *buf, | |
2012 | size_t count, loff_t *ppos) | |
2013 | { | |
2014 | struct task_struct *task = get_proc_task(file->f_dentry->d_inode); | |
2015 | struct mm_struct *mm; | |
2016 | char buffer[PROC_NUMBUF]; | |
2017 | size_t len; | |
2018 | int ret; | |
2019 | ||
2020 | if (!task) | |
2021 | return -ESRCH; | |
2022 | ||
2023 | ret = 0; | |
2024 | mm = get_task_mm(task); | |
2025 | if (mm) { | |
2026 | len = snprintf(buffer, sizeof(buffer), "%08lx\n", | |
2027 | ((mm->flags & MMF_DUMP_FILTER_MASK) >> | |
2028 | MMF_DUMP_FILTER_SHIFT)); | |
2029 | mmput(mm); | |
2030 | ret = simple_read_from_buffer(buf, count, ppos, buffer, len); | |
2031 | } | |
2032 | ||
2033 | put_task_struct(task); | |
2034 | ||
2035 | return ret; | |
2036 | } | |
2037 | ||
2038 | static ssize_t proc_coredump_filter_write(struct file *file, | |
2039 | const char __user *buf, | |
2040 | size_t count, | |
2041 | loff_t *ppos) | |
2042 | { | |
2043 | struct task_struct *task; | |
2044 | struct mm_struct *mm; | |
2045 | char buffer[PROC_NUMBUF], *end; | |
2046 | unsigned int val; | |
2047 | int ret; | |
2048 | int i; | |
2049 | unsigned long mask; | |
2050 | ||
2051 | ret = -EFAULT; | |
2052 | memset(buffer, 0, sizeof(buffer)); | |
2053 | if (count > sizeof(buffer) - 1) | |
2054 | count = sizeof(buffer) - 1; | |
2055 | if (copy_from_user(buffer, buf, count)) | |
2056 | goto out_no_task; | |
2057 | ||
2058 | ret = -EINVAL; | |
2059 | val = (unsigned int)simple_strtoul(buffer, &end, 0); | |
2060 | if (*end == '\n') | |
2061 | end++; | |
2062 | if (end - buffer == 0) | |
2063 | goto out_no_task; | |
2064 | ||
2065 | ret = -ESRCH; | |
2066 | task = get_proc_task(file->f_dentry->d_inode); | |
2067 | if (!task) | |
2068 | goto out_no_task; | |
2069 | ||
2070 | ret = end - buffer; | |
2071 | mm = get_task_mm(task); | |
2072 | if (!mm) | |
2073 | goto out_no_mm; | |
2074 | ||
2075 | for (i = 0, mask = 1; i < MMF_DUMP_FILTER_BITS; i++, mask <<= 1) { | |
2076 | if (val & mask) | |
2077 | set_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags); | |
2078 | else | |
2079 | clear_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags); | |
2080 | } | |
2081 | ||
2082 | mmput(mm); | |
2083 | out_no_mm: | |
2084 | put_task_struct(task); | |
2085 | out_no_task: | |
2086 | return ret; | |
2087 | } | |
2088 | ||
2089 | static const struct file_operations proc_coredump_filter_operations = { | |
2090 | .read = proc_coredump_filter_read, | |
2091 | .write = proc_coredump_filter_write, | |
2092 | }; | |
2093 | #endif | |
2094 | ||
28a6d671 EB |
2095 | /* |
2096 | * /proc/self: | |
2097 | */ | |
2098 | static int proc_self_readlink(struct dentry *dentry, char __user *buffer, | |
2099 | int buflen) | |
2100 | { | |
2101 | char tmp[PROC_NUMBUF]; | |
b488893a | 2102 | sprintf(tmp, "%d", task_tgid_vnr(current)); |
28a6d671 EB |
2103 | return vfs_readlink(dentry,buffer,buflen,tmp); |
2104 | } | |
2105 | ||
2106 | static void *proc_self_follow_link(struct dentry *dentry, struct nameidata *nd) | |
2107 | { | |
2108 | char tmp[PROC_NUMBUF]; | |
b488893a | 2109 | sprintf(tmp, "%d", task_tgid_vnr(current)); |
28a6d671 EB |
2110 | return ERR_PTR(vfs_follow_link(nd,tmp)); |
2111 | } | |
2112 | ||
c5ef1c42 | 2113 | static const struct inode_operations proc_self_inode_operations = { |
28a6d671 EB |
2114 | .readlink = proc_self_readlink, |
2115 | .follow_link = proc_self_follow_link, | |
2116 | }; | |
2117 | ||
801199ce EB |
2118 | /* |
2119 | * proc base | |
2120 | * | |
2121 | * These are the directory entries in the root directory of /proc | |
2122 | * that properly belong to the /proc filesystem, as they describe | |
2123 | * describe something that is process related. | |
2124 | */ | |
c5141e6d | 2125 | static const struct pid_entry proc_base_stuff[] = { |
61a28784 | 2126 | NOD("self", S_IFLNK|S_IRWXUGO, |
801199ce | 2127 | &proc_self_inode_operations, NULL, {}), |
801199ce EB |
2128 | }; |
2129 | ||
2130 | /* | |
2131 | * Exceptional case: normally we are not allowed to unhash a busy | |
2132 | * directory. In this case, however, we can do it - no aliasing problems | |
2133 | * due to the way we treat inodes. | |
2134 | */ | |
2135 | static int proc_base_revalidate(struct dentry *dentry, struct nameidata *nd) | |
2136 | { | |
2137 | struct inode *inode = dentry->d_inode; | |
2138 | struct task_struct *task = get_proc_task(inode); | |
2139 | if (task) { | |
2140 | put_task_struct(task); | |
2141 | return 1; | |
2142 | } | |
2143 | d_drop(dentry); | |
2144 | return 0; | |
2145 | } | |
2146 | ||
2147 | static struct dentry_operations proc_base_dentry_operations = | |
2148 | { | |
2149 | .d_revalidate = proc_base_revalidate, | |
2150 | .d_delete = pid_delete_dentry, | |
2151 | }; | |
2152 | ||
444ceed8 | 2153 | static struct dentry *proc_base_instantiate(struct inode *dir, |
c5141e6d | 2154 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
801199ce | 2155 | { |
c5141e6d | 2156 | const struct pid_entry *p = ptr; |
801199ce | 2157 | struct inode *inode; |
801199ce | 2158 | struct proc_inode *ei; |
444ceed8 | 2159 | struct dentry *error = ERR_PTR(-EINVAL); |
801199ce EB |
2160 | |
2161 | /* Allocate the inode */ | |
2162 | error = ERR_PTR(-ENOMEM); | |
2163 | inode = new_inode(dir->i_sb); | |
2164 | if (!inode) | |
2165 | goto out; | |
2166 | ||
2167 | /* Initialize the inode */ | |
2168 | ei = PROC_I(inode); | |
2169 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; | |
801199ce EB |
2170 | |
2171 | /* | |
2172 | * grab the reference to the task. | |
2173 | */ | |
1a657f78 | 2174 | ei->pid = get_task_pid(task, PIDTYPE_PID); |
801199ce EB |
2175 | if (!ei->pid) |
2176 | goto out_iput; | |
2177 | ||
2178 | inode->i_uid = 0; | |
2179 | inode->i_gid = 0; | |
2180 | inode->i_mode = p->mode; | |
2181 | if (S_ISDIR(inode->i_mode)) | |
2182 | inode->i_nlink = 2; | |
2183 | if (S_ISLNK(inode->i_mode)) | |
2184 | inode->i_size = 64; | |
2185 | if (p->iop) | |
2186 | inode->i_op = p->iop; | |
2187 | if (p->fop) | |
2188 | inode->i_fop = p->fop; | |
2189 | ei->op = p->op; | |
2190 | dentry->d_op = &proc_base_dentry_operations; | |
2191 | d_add(dentry, inode); | |
2192 | error = NULL; | |
2193 | out: | |
801199ce EB |
2194 | return error; |
2195 | out_iput: | |
2196 | iput(inode); | |
2197 | goto out; | |
2198 | } | |
2199 | ||
444ceed8 EB |
2200 | static struct dentry *proc_base_lookup(struct inode *dir, struct dentry *dentry) |
2201 | { | |
2202 | struct dentry *error; | |
2203 | struct task_struct *task = get_proc_task(dir); | |
c5141e6d | 2204 | const struct pid_entry *p, *last; |
444ceed8 EB |
2205 | |
2206 | error = ERR_PTR(-ENOENT); | |
2207 | ||
2208 | if (!task) | |
2209 | goto out_no_task; | |
2210 | ||
2211 | /* Lookup the directory entry */ | |
7bcd6b0e EB |
2212 | last = &proc_base_stuff[ARRAY_SIZE(proc_base_stuff) - 1]; |
2213 | for (p = proc_base_stuff; p <= last; p++) { | |
444ceed8 EB |
2214 | if (p->len != dentry->d_name.len) |
2215 | continue; | |
2216 | if (!memcmp(dentry->d_name.name, p->name, p->len)) | |
2217 | break; | |
2218 | } | |
7bcd6b0e | 2219 | if (p > last) |
444ceed8 EB |
2220 | goto out; |
2221 | ||
2222 | error = proc_base_instantiate(dir, dentry, task, p); | |
2223 | ||
2224 | out: | |
2225 | put_task_struct(task); | |
2226 | out_no_task: | |
2227 | return error; | |
2228 | } | |
2229 | ||
c5141e6d ED |
2230 | static int proc_base_fill_cache(struct file *filp, void *dirent, |
2231 | filldir_t filldir, struct task_struct *task, const struct pid_entry *p) | |
61a28784 EB |
2232 | { |
2233 | return proc_fill_cache(filp, dirent, filldir, p->name, p->len, | |
2234 | proc_base_instantiate, task, p); | |
2235 | } | |
2236 | ||
aba76fdb AM |
2237 | #ifdef CONFIG_TASK_IO_ACCOUNTING |
2238 | static int proc_pid_io_accounting(struct task_struct *task, char *buffer) | |
2239 | { | |
2240 | return sprintf(buffer, | |
4b98d11b | 2241 | #ifdef CONFIG_TASK_XACCT |
aba76fdb AM |
2242 | "rchar: %llu\n" |
2243 | "wchar: %llu\n" | |
2244 | "syscr: %llu\n" | |
2245 | "syscw: %llu\n" | |
4b98d11b | 2246 | #endif |
aba76fdb AM |
2247 | "read_bytes: %llu\n" |
2248 | "write_bytes: %llu\n" | |
2249 | "cancelled_write_bytes: %llu\n", | |
4b98d11b | 2250 | #ifdef CONFIG_TASK_XACCT |
aba76fdb AM |
2251 | (unsigned long long)task->rchar, |
2252 | (unsigned long long)task->wchar, | |
2253 | (unsigned long long)task->syscr, | |
2254 | (unsigned long long)task->syscw, | |
4b98d11b | 2255 | #endif |
aba76fdb AM |
2256 | (unsigned long long)task->ioac.read_bytes, |
2257 | (unsigned long long)task->ioac.write_bytes, | |
2258 | (unsigned long long)task->ioac.cancelled_write_bytes); | |
2259 | } | |
2260 | #endif | |
2261 | ||
28a6d671 EB |
2262 | /* |
2263 | * Thread groups | |
2264 | */ | |
00977a59 | 2265 | static const struct file_operations proc_task_operations; |
c5ef1c42 | 2266 | static const struct inode_operations proc_task_inode_operations; |
20cdc894 | 2267 | |
c5141e6d | 2268 | static const struct pid_entry tgid_base_stuff[] = { |
61a28784 EB |
2269 | DIR("task", S_IRUGO|S_IXUGO, task), |
2270 | DIR("fd", S_IRUSR|S_IXUSR, fd), | |
27932742 | 2271 | DIR("fdinfo", S_IRUSR|S_IXUSR, fdinfo), |
315e28c8 | 2272 | REG("environ", S_IRUSR, environ), |
61a28784 EB |
2273 | INF("auxv", S_IRUSR, pid_auxv), |
2274 | INF("status", S_IRUGO, pid_status), | |
d85f50d5 | 2275 | INF("limits", S_IRUSR, pid_limits), |
43ae34cb IM |
2276 | #ifdef CONFIG_SCHED_DEBUG |
2277 | REG("sched", S_IRUGO|S_IWUSR, pid_sched), | |
2278 | #endif | |
61a28784 EB |
2279 | INF("cmdline", S_IRUGO, pid_cmdline), |
2280 | INF("stat", S_IRUGO, tgid_stat), | |
2281 | INF("statm", S_IRUGO, pid_statm), | |
2282 | REG("maps", S_IRUGO, maps), | |
28a6d671 | 2283 | #ifdef CONFIG_NUMA |
61a28784 | 2284 | REG("numa_maps", S_IRUGO, numa_maps), |
28a6d671 | 2285 | #endif |
61a28784 | 2286 | REG("mem", S_IRUSR|S_IWUSR, mem), |
61a28784 EB |
2287 | LNK("cwd", cwd), |
2288 | LNK("root", root), | |
2289 | LNK("exe", exe), | |
2290 | REG("mounts", S_IRUGO, mounts), | |
2291 | REG("mountstats", S_IRUSR, mountstats), | |
28a6d671 | 2292 | #ifdef CONFIG_MMU |
b813e931 | 2293 | REG("clear_refs", S_IWUSR, clear_refs), |
61a28784 | 2294 | REG("smaps", S_IRUGO, smaps), |
28a6d671 EB |
2295 | #endif |
2296 | #ifdef CONFIG_SECURITY | |
72d9dcfc | 2297 | DIR("attr", S_IRUGO|S_IXUGO, attr_dir), |
28a6d671 EB |
2298 | #endif |
2299 | #ifdef CONFIG_KALLSYMS | |
61a28784 | 2300 | INF("wchan", S_IRUGO, pid_wchan), |
28a6d671 EB |
2301 | #endif |
2302 | #ifdef CONFIG_SCHEDSTATS | |
61a28784 | 2303 | INF("schedstat", S_IRUGO, pid_schedstat), |
28a6d671 | 2304 | #endif |
9745512c AV |
2305 | #ifdef CONFIG_LATENCYTOP |
2306 | REG("latency", S_IRUGO, lstats), | |
2307 | #endif | |
8793d854 | 2308 | #ifdef CONFIG_PROC_PID_CPUSET |
61a28784 | 2309 | REG("cpuset", S_IRUGO, cpuset), |
a424316c PM |
2310 | #endif |
2311 | #ifdef CONFIG_CGROUPS | |
2312 | REG("cgroup", S_IRUGO, cgroup), | |
28a6d671 | 2313 | #endif |
61a28784 EB |
2314 | INF("oom_score", S_IRUGO, oom_score), |
2315 | REG("oom_adj", S_IRUGO|S_IWUSR, oom_adjust), | |
28a6d671 | 2316 | #ifdef CONFIG_AUDITSYSCALL |
61a28784 | 2317 | REG("loginuid", S_IWUSR|S_IRUGO, loginuid), |
28a6d671 | 2318 | #endif |
f4f154fd AM |
2319 | #ifdef CONFIG_FAULT_INJECTION |
2320 | REG("make-it-fail", S_IRUGO|S_IWUSR, fault_inject), | |
2321 | #endif | |
3cb4a0bb KH |
2322 | #if defined(USE_ELF_CORE_DUMP) && defined(CONFIG_ELF_CORE) |
2323 | REG("coredump_filter", S_IRUGO|S_IWUSR, coredump_filter), | |
2324 | #endif | |
aba76fdb AM |
2325 | #ifdef CONFIG_TASK_IO_ACCOUNTING |
2326 | INF("io", S_IRUGO, pid_io_accounting), | |
2327 | #endif | |
28a6d671 | 2328 | }; |
1da177e4 | 2329 | |
28a6d671 | 2330 | static int proc_tgid_base_readdir(struct file * filp, |
1da177e4 LT |
2331 | void * dirent, filldir_t filldir) |
2332 | { | |
2333 | return proc_pident_readdir(filp,dirent,filldir, | |
28a6d671 | 2334 | tgid_base_stuff,ARRAY_SIZE(tgid_base_stuff)); |
1da177e4 LT |
2335 | } |
2336 | ||
00977a59 | 2337 | static const struct file_operations proc_tgid_base_operations = { |
1da177e4 | 2338 | .read = generic_read_dir, |
28a6d671 | 2339 | .readdir = proc_tgid_base_readdir, |
1da177e4 LT |
2340 | }; |
2341 | ||
28a6d671 | 2342 | static struct dentry *proc_tgid_base_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd){ |
7bcd6b0e EB |
2343 | return proc_pident_lookup(dir, dentry, |
2344 | tgid_base_stuff, ARRAY_SIZE(tgid_base_stuff)); | |
1da177e4 LT |
2345 | } |
2346 | ||
c5ef1c42 | 2347 | static const struct inode_operations proc_tgid_base_inode_operations = { |
28a6d671 | 2348 | .lookup = proc_tgid_base_lookup, |
99f89551 | 2349 | .getattr = pid_getattr, |
6d76fa58 | 2350 | .setattr = proc_setattr, |
1da177e4 | 2351 | }; |
1da177e4 | 2352 | |
60347f67 | 2353 | static void proc_flush_task_mnt(struct vfsmount *mnt, pid_t pid, pid_t tgid) |
1da177e4 | 2354 | { |
48e6484d | 2355 | struct dentry *dentry, *leader, *dir; |
8578cea7 | 2356 | char buf[PROC_NUMBUF]; |
48e6484d EB |
2357 | struct qstr name; |
2358 | ||
2359 | name.name = buf; | |
60347f67 PE |
2360 | name.len = snprintf(buf, sizeof(buf), "%d", pid); |
2361 | dentry = d_hash_and_lookup(mnt->mnt_root, &name); | |
48e6484d EB |
2362 | if (dentry) { |
2363 | shrink_dcache_parent(dentry); | |
2364 | d_drop(dentry); | |
2365 | dput(dentry); | |
2366 | } | |
1da177e4 | 2367 | |
60347f67 | 2368 | if (tgid == 0) |
48e6484d | 2369 | goto out; |
1da177e4 | 2370 | |
48e6484d | 2371 | name.name = buf; |
60347f67 PE |
2372 | name.len = snprintf(buf, sizeof(buf), "%d", tgid); |
2373 | leader = d_hash_and_lookup(mnt->mnt_root, &name); | |
48e6484d EB |
2374 | if (!leader) |
2375 | goto out; | |
1da177e4 | 2376 | |
48e6484d EB |
2377 | name.name = "task"; |
2378 | name.len = strlen(name.name); | |
2379 | dir = d_hash_and_lookup(leader, &name); | |
2380 | if (!dir) | |
2381 | goto out_put_leader; | |
2382 | ||
2383 | name.name = buf; | |
60347f67 | 2384 | name.len = snprintf(buf, sizeof(buf), "%d", pid); |
48e6484d EB |
2385 | dentry = d_hash_and_lookup(dir, &name); |
2386 | if (dentry) { | |
2387 | shrink_dcache_parent(dentry); | |
2388 | d_drop(dentry); | |
2389 | dput(dentry); | |
1da177e4 | 2390 | } |
48e6484d EB |
2391 | |
2392 | dput(dir); | |
2393 | out_put_leader: | |
2394 | dput(leader); | |
2395 | out: | |
2396 | return; | |
1da177e4 LT |
2397 | } |
2398 | ||
0895e91d RD |
2399 | /** |
2400 | * proc_flush_task - Remove dcache entries for @task from the /proc dcache. | |
2401 | * @task: task that should be flushed. | |
2402 | * | |
2403 | * When flushing dentries from proc, one needs to flush them from global | |
60347f67 | 2404 | * proc (proc_mnt) and from all the namespaces' procs this task was seen |
0895e91d RD |
2405 | * in. This call is supposed to do all of this job. |
2406 | * | |
2407 | * Looks in the dcache for | |
2408 | * /proc/@pid | |
2409 | * /proc/@tgid/task/@pid | |
2410 | * if either directory is present flushes it and all of it'ts children | |
2411 | * from the dcache. | |
2412 | * | |
2413 | * It is safe and reasonable to cache /proc entries for a task until | |
2414 | * that task exits. After that they just clog up the dcache with | |
2415 | * useless entries, possibly causing useful dcache entries to be | |
2416 | * flushed instead. This routine is proved to flush those useless | |
2417 | * dcache entries at process exit time. | |
2418 | * | |
2419 | * NOTE: This routine is just an optimization so it does not guarantee | |
2420 | * that no dcache entries will exist at process exit time it | |
2421 | * just makes it very unlikely that any will persist. | |
60347f67 PE |
2422 | */ |
2423 | ||
2424 | void proc_flush_task(struct task_struct *task) | |
2425 | { | |
9fcc2d15 EB |
2426 | int i; |
2427 | struct pid *pid, *tgid = NULL; | |
130f77ec PE |
2428 | struct upid *upid; |
2429 | ||
130f77ec | 2430 | pid = task_pid(task); |
9fcc2d15 EB |
2431 | if (thread_group_leader(task)) |
2432 | tgid = task_tgid(task); | |
130f77ec | 2433 | |
9fcc2d15 | 2434 | for (i = 0; i <= pid->level; i++) { |
130f77ec PE |
2435 | upid = &pid->numbers[i]; |
2436 | proc_flush_task_mnt(upid->ns->proc_mnt, upid->nr, | |
9fcc2d15 | 2437 | tgid ? tgid->numbers[i].nr : 0); |
130f77ec | 2438 | } |
6f4e6433 PE |
2439 | |
2440 | upid = &pid->numbers[pid->level]; | |
2441 | if (upid->nr == 1) | |
2442 | pid_ns_release_proc(upid->ns); | |
60347f67 PE |
2443 | } |
2444 | ||
9711ef99 AB |
2445 | static struct dentry *proc_pid_instantiate(struct inode *dir, |
2446 | struct dentry * dentry, | |
c5141e6d | 2447 | struct task_struct *task, const void *ptr) |
444ceed8 EB |
2448 | { |
2449 | struct dentry *error = ERR_PTR(-ENOENT); | |
2450 | struct inode *inode; | |
2451 | ||
61a28784 | 2452 | inode = proc_pid_make_inode(dir->i_sb, task); |
444ceed8 EB |
2453 | if (!inode) |
2454 | goto out; | |
2455 | ||
2456 | inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO; | |
2457 | inode->i_op = &proc_tgid_base_inode_operations; | |
2458 | inode->i_fop = &proc_tgid_base_operations; | |
2459 | inode->i_flags|=S_IMMUTABLE; | |
27932742 | 2460 | inode->i_nlink = 5; |
444ceed8 EB |
2461 | #ifdef CONFIG_SECURITY |
2462 | inode->i_nlink += 1; | |
2463 | #endif | |
2464 | ||
2465 | dentry->d_op = &pid_dentry_operations; | |
2466 | ||
2467 | d_add(dentry, inode); | |
2468 | /* Close the race of the process dying before we return the dentry */ | |
2469 | if (pid_revalidate(dentry, NULL)) | |
2470 | error = NULL; | |
2471 | out: | |
2472 | return error; | |
2473 | } | |
2474 | ||
1da177e4 LT |
2475 | struct dentry *proc_pid_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd) |
2476 | { | |
cd6a3ce9 | 2477 | struct dentry *result = ERR_PTR(-ENOENT); |
1da177e4 | 2478 | struct task_struct *task; |
1da177e4 | 2479 | unsigned tgid; |
b488893a | 2480 | struct pid_namespace *ns; |
1da177e4 | 2481 | |
801199ce EB |
2482 | result = proc_base_lookup(dir, dentry); |
2483 | if (!IS_ERR(result) || PTR_ERR(result) != -ENOENT) | |
2484 | goto out; | |
2485 | ||
1da177e4 LT |
2486 | tgid = name_to_int(dentry); |
2487 | if (tgid == ~0U) | |
2488 | goto out; | |
2489 | ||
b488893a | 2490 | ns = dentry->d_sb->s_fs_info; |
de758734 | 2491 | rcu_read_lock(); |
b488893a | 2492 | task = find_task_by_pid_ns(tgid, ns); |
1da177e4 LT |
2493 | if (task) |
2494 | get_task_struct(task); | |
de758734 | 2495 | rcu_read_unlock(); |
1da177e4 LT |
2496 | if (!task) |
2497 | goto out; | |
2498 | ||
444ceed8 | 2499 | result = proc_pid_instantiate(dir, dentry, task, NULL); |
1da177e4 | 2500 | put_task_struct(task); |
1da177e4 | 2501 | out: |
cd6a3ce9 | 2502 | return result; |
1da177e4 LT |
2503 | } |
2504 | ||
1da177e4 | 2505 | /* |
0804ef4b | 2506 | * Find the first task with tgid >= tgid |
0bc58a91 | 2507 | * |
1da177e4 | 2508 | */ |
19fd4bb2 EB |
2509 | struct tgid_iter { |
2510 | unsigned int tgid; | |
0804ef4b | 2511 | struct task_struct *task; |
19fd4bb2 EB |
2512 | }; |
2513 | static struct tgid_iter next_tgid(struct pid_namespace *ns, struct tgid_iter iter) | |
2514 | { | |
0804ef4b | 2515 | struct pid *pid; |
1da177e4 | 2516 | |
19fd4bb2 EB |
2517 | if (iter.task) |
2518 | put_task_struct(iter.task); | |
454cc105 | 2519 | rcu_read_lock(); |
0804ef4b | 2520 | retry: |
19fd4bb2 EB |
2521 | iter.task = NULL; |
2522 | pid = find_ge_pid(iter.tgid, ns); | |
0804ef4b | 2523 | if (pid) { |
19fd4bb2 EB |
2524 | iter.tgid = pid_nr_ns(pid, ns); |
2525 | iter.task = pid_task(pid, PIDTYPE_PID); | |
0804ef4b EB |
2526 | /* What we to know is if the pid we have find is the |
2527 | * pid of a thread_group_leader. Testing for task | |
2528 | * being a thread_group_leader is the obvious thing | |
2529 | * todo but there is a window when it fails, due to | |
2530 | * the pid transfer logic in de_thread. | |
2531 | * | |
2532 | * So we perform the straight forward test of seeing | |
2533 | * if the pid we have found is the pid of a thread | |
2534 | * group leader, and don't worry if the task we have | |
2535 | * found doesn't happen to be a thread group leader. | |
2536 | * As we don't care in the case of readdir. | |
2537 | */ | |
19fd4bb2 EB |
2538 | if (!iter.task || !has_group_leader_pid(iter.task)) { |
2539 | iter.tgid += 1; | |
0804ef4b | 2540 | goto retry; |
19fd4bb2 EB |
2541 | } |
2542 | get_task_struct(iter.task); | |
0bc58a91 | 2543 | } |
454cc105 | 2544 | rcu_read_unlock(); |
19fd4bb2 | 2545 | return iter; |
1da177e4 LT |
2546 | } |
2547 | ||
7bcd6b0e | 2548 | #define TGID_OFFSET (FIRST_PROCESS_ENTRY + ARRAY_SIZE(proc_base_stuff)) |
0804ef4b | 2549 | |
61a28784 | 2550 | static int proc_pid_fill_cache(struct file *filp, void *dirent, filldir_t filldir, |
19fd4bb2 | 2551 | struct tgid_iter iter) |
61a28784 EB |
2552 | { |
2553 | char name[PROC_NUMBUF]; | |
19fd4bb2 | 2554 | int len = snprintf(name, sizeof(name), "%d", iter.tgid); |
61a28784 | 2555 | return proc_fill_cache(filp, dirent, filldir, name, len, |
19fd4bb2 | 2556 | proc_pid_instantiate, iter.task, NULL); |
61a28784 EB |
2557 | } |
2558 | ||
1da177e4 LT |
2559 | /* for the /proc/ directory itself, after non-process stuff has been done */ |
2560 | int proc_pid_readdir(struct file * filp, void * dirent, filldir_t filldir) | |
2561 | { | |
1da177e4 | 2562 | unsigned int nr = filp->f_pos - FIRST_PROCESS_ENTRY; |
2fddfeef | 2563 | struct task_struct *reaper = get_proc_task(filp->f_path.dentry->d_inode); |
19fd4bb2 | 2564 | struct tgid_iter iter; |
b488893a | 2565 | struct pid_namespace *ns; |
1da177e4 | 2566 | |
61a28784 EB |
2567 | if (!reaper) |
2568 | goto out_no_task; | |
2569 | ||
7bcd6b0e | 2570 | for (; nr < ARRAY_SIZE(proc_base_stuff); filp->f_pos++, nr++) { |
c5141e6d | 2571 | const struct pid_entry *p = &proc_base_stuff[nr]; |
61a28784 | 2572 | if (proc_base_fill_cache(filp, dirent, filldir, reaper, p) < 0) |
801199ce | 2573 | goto out; |
1da177e4 LT |
2574 | } |
2575 | ||
b488893a | 2576 | ns = filp->f_dentry->d_sb->s_fs_info; |
19fd4bb2 EB |
2577 | iter.task = NULL; |
2578 | iter.tgid = filp->f_pos - TGID_OFFSET; | |
2579 | for (iter = next_tgid(ns, iter); | |
2580 | iter.task; | |
2581 | iter.tgid += 1, iter = next_tgid(ns, iter)) { | |
2582 | filp->f_pos = iter.tgid + TGID_OFFSET; | |
2583 | if (proc_pid_fill_cache(filp, dirent, filldir, iter) < 0) { | |
2584 | put_task_struct(iter.task); | |
0804ef4b | 2585 | goto out; |
1da177e4 | 2586 | } |
0bc58a91 | 2587 | } |
0804ef4b EB |
2588 | filp->f_pos = PID_MAX_LIMIT + TGID_OFFSET; |
2589 | out: | |
61a28784 EB |
2590 | put_task_struct(reaper); |
2591 | out_no_task: | |
0bc58a91 EB |
2592 | return 0; |
2593 | } | |
1da177e4 | 2594 | |
28a6d671 EB |
2595 | /* |
2596 | * Tasks | |
2597 | */ | |
c5141e6d | 2598 | static const struct pid_entry tid_base_stuff[] = { |
61a28784 | 2599 | DIR("fd", S_IRUSR|S_IXUSR, fd), |
27932742 | 2600 | DIR("fdinfo", S_IRUSR|S_IXUSR, fdinfo), |
315e28c8 | 2601 | REG("environ", S_IRUSR, environ), |
61a28784 EB |
2602 | INF("auxv", S_IRUSR, pid_auxv), |
2603 | INF("status", S_IRUGO, pid_status), | |
d85f50d5 | 2604 | INF("limits", S_IRUSR, pid_limits), |
43ae34cb IM |
2605 | #ifdef CONFIG_SCHED_DEBUG |
2606 | REG("sched", S_IRUGO|S_IWUSR, pid_sched), | |
2607 | #endif | |
61a28784 EB |
2608 | INF("cmdline", S_IRUGO, pid_cmdline), |
2609 | INF("stat", S_IRUGO, tid_stat), | |
2610 | INF("statm", S_IRUGO, pid_statm), | |
2611 | REG("maps", S_IRUGO, maps), | |
28a6d671 | 2612 | #ifdef CONFIG_NUMA |
61a28784 | 2613 | REG("numa_maps", S_IRUGO, numa_maps), |
28a6d671 | 2614 | #endif |
61a28784 | 2615 | REG("mem", S_IRUSR|S_IWUSR, mem), |
61a28784 EB |
2616 | LNK("cwd", cwd), |
2617 | LNK("root", root), | |
2618 | LNK("exe", exe), | |
2619 | REG("mounts", S_IRUGO, mounts), | |
28a6d671 | 2620 | #ifdef CONFIG_MMU |
b813e931 | 2621 | REG("clear_refs", S_IWUSR, clear_refs), |
61a28784 | 2622 | REG("smaps", S_IRUGO, smaps), |
28a6d671 EB |
2623 | #endif |
2624 | #ifdef CONFIG_SECURITY | |
72d9dcfc | 2625 | DIR("attr", S_IRUGO|S_IXUGO, attr_dir), |
28a6d671 EB |
2626 | #endif |
2627 | #ifdef CONFIG_KALLSYMS | |
61a28784 | 2628 | INF("wchan", S_IRUGO, pid_wchan), |
28a6d671 EB |
2629 | #endif |
2630 | #ifdef CONFIG_SCHEDSTATS | |
61a28784 | 2631 | INF("schedstat", S_IRUGO, pid_schedstat), |
28a6d671 | 2632 | #endif |
9745512c AV |
2633 | #ifdef CONFIG_LATENCYTOP |
2634 | REG("latency", S_IRUGO, lstats), | |
2635 | #endif | |
8793d854 | 2636 | #ifdef CONFIG_PROC_PID_CPUSET |
61a28784 | 2637 | REG("cpuset", S_IRUGO, cpuset), |
a424316c PM |
2638 | #endif |
2639 | #ifdef CONFIG_CGROUPS | |
2640 | REG("cgroup", S_IRUGO, cgroup), | |
28a6d671 | 2641 | #endif |
61a28784 EB |
2642 | INF("oom_score", S_IRUGO, oom_score), |
2643 | REG("oom_adj", S_IRUGO|S_IWUSR, oom_adjust), | |
28a6d671 | 2644 | #ifdef CONFIG_AUDITSYSCALL |
61a28784 | 2645 | REG("loginuid", S_IWUSR|S_IRUGO, loginuid), |
28a6d671 | 2646 | #endif |
f4f154fd AM |
2647 | #ifdef CONFIG_FAULT_INJECTION |
2648 | REG("make-it-fail", S_IRUGO|S_IWUSR, fault_inject), | |
2649 | #endif | |
28a6d671 EB |
2650 | }; |
2651 | ||
2652 | static int proc_tid_base_readdir(struct file * filp, | |
2653 | void * dirent, filldir_t filldir) | |
2654 | { | |
2655 | return proc_pident_readdir(filp,dirent,filldir, | |
2656 | tid_base_stuff,ARRAY_SIZE(tid_base_stuff)); | |
2657 | } | |
2658 | ||
2659 | static struct dentry *proc_tid_base_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd){ | |
7bcd6b0e EB |
2660 | return proc_pident_lookup(dir, dentry, |
2661 | tid_base_stuff, ARRAY_SIZE(tid_base_stuff)); | |
28a6d671 EB |
2662 | } |
2663 | ||
00977a59 | 2664 | static const struct file_operations proc_tid_base_operations = { |
28a6d671 EB |
2665 | .read = generic_read_dir, |
2666 | .readdir = proc_tid_base_readdir, | |
2667 | }; | |
2668 | ||
c5ef1c42 | 2669 | static const struct inode_operations proc_tid_base_inode_operations = { |
28a6d671 EB |
2670 | .lookup = proc_tid_base_lookup, |
2671 | .getattr = pid_getattr, | |
2672 | .setattr = proc_setattr, | |
2673 | }; | |
2674 | ||
444ceed8 | 2675 | static struct dentry *proc_task_instantiate(struct inode *dir, |
c5141e6d | 2676 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
444ceed8 EB |
2677 | { |
2678 | struct dentry *error = ERR_PTR(-ENOENT); | |
2679 | struct inode *inode; | |
61a28784 | 2680 | inode = proc_pid_make_inode(dir->i_sb, task); |
444ceed8 EB |
2681 | |
2682 | if (!inode) | |
2683 | goto out; | |
2684 | inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO; | |
2685 | inode->i_op = &proc_tid_base_inode_operations; | |
2686 | inode->i_fop = &proc_tid_base_operations; | |
2687 | inode->i_flags|=S_IMMUTABLE; | |
27932742 | 2688 | inode->i_nlink = 4; |
444ceed8 EB |
2689 | #ifdef CONFIG_SECURITY |
2690 | inode->i_nlink += 1; | |
2691 | #endif | |
2692 | ||
2693 | dentry->d_op = &pid_dentry_operations; | |
2694 | ||
2695 | d_add(dentry, inode); | |
2696 | /* Close the race of the process dying before we return the dentry */ | |
2697 | if (pid_revalidate(dentry, NULL)) | |
2698 | error = NULL; | |
2699 | out: | |
2700 | return error; | |
2701 | } | |
2702 | ||
28a6d671 EB |
2703 | static struct dentry *proc_task_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd) |
2704 | { | |
2705 | struct dentry *result = ERR_PTR(-ENOENT); | |
2706 | struct task_struct *task; | |
2707 | struct task_struct *leader = get_proc_task(dir); | |
28a6d671 | 2708 | unsigned tid; |
b488893a | 2709 | struct pid_namespace *ns; |
28a6d671 EB |
2710 | |
2711 | if (!leader) | |
2712 | goto out_no_task; | |
2713 | ||
2714 | tid = name_to_int(dentry); | |
2715 | if (tid == ~0U) | |
2716 | goto out; | |
2717 | ||
b488893a | 2718 | ns = dentry->d_sb->s_fs_info; |
28a6d671 | 2719 | rcu_read_lock(); |
b488893a | 2720 | task = find_task_by_pid_ns(tid, ns); |
28a6d671 EB |
2721 | if (task) |
2722 | get_task_struct(task); | |
2723 | rcu_read_unlock(); | |
2724 | if (!task) | |
2725 | goto out; | |
bac0abd6 | 2726 | if (!same_thread_group(leader, task)) |
28a6d671 EB |
2727 | goto out_drop_task; |
2728 | ||
444ceed8 | 2729 | result = proc_task_instantiate(dir, dentry, task, NULL); |
28a6d671 EB |
2730 | out_drop_task: |
2731 | put_task_struct(task); | |
2732 | out: | |
2733 | put_task_struct(leader); | |
2734 | out_no_task: | |
2735 | return result; | |
2736 | } | |
2737 | ||
0bc58a91 EB |
2738 | /* |
2739 | * Find the first tid of a thread group to return to user space. | |
2740 | * | |
2741 | * Usually this is just the thread group leader, but if the users | |
2742 | * buffer was too small or there was a seek into the middle of the | |
2743 | * directory we have more work todo. | |
2744 | * | |
2745 | * In the case of a short read we start with find_task_by_pid. | |
2746 | * | |
2747 | * In the case of a seek we start with the leader and walk nr | |
2748 | * threads past it. | |
2749 | */ | |
cc288738 | 2750 | static struct task_struct *first_tid(struct task_struct *leader, |
b488893a | 2751 | int tid, int nr, struct pid_namespace *ns) |
0bc58a91 | 2752 | { |
a872ff0c | 2753 | struct task_struct *pos; |
1da177e4 | 2754 | |
cc288738 | 2755 | rcu_read_lock(); |
0bc58a91 EB |
2756 | /* Attempt to start with the pid of a thread */ |
2757 | if (tid && (nr > 0)) { | |
b488893a | 2758 | pos = find_task_by_pid_ns(tid, ns); |
a872ff0c ON |
2759 | if (pos && (pos->group_leader == leader)) |
2760 | goto found; | |
0bc58a91 | 2761 | } |
1da177e4 | 2762 | |
0bc58a91 | 2763 | /* If nr exceeds the number of threads there is nothing todo */ |
a872ff0c ON |
2764 | pos = NULL; |
2765 | if (nr && nr >= get_nr_threads(leader)) | |
2766 | goto out; | |
1da177e4 | 2767 | |
a872ff0c ON |
2768 | /* If we haven't found our starting place yet start |
2769 | * with the leader and walk nr threads forward. | |
0bc58a91 | 2770 | */ |
a872ff0c ON |
2771 | for (pos = leader; nr > 0; --nr) { |
2772 | pos = next_thread(pos); | |
2773 | if (pos == leader) { | |
2774 | pos = NULL; | |
2775 | goto out; | |
2776 | } | |
1da177e4 | 2777 | } |
a872ff0c ON |
2778 | found: |
2779 | get_task_struct(pos); | |
2780 | out: | |
cc288738 | 2781 | rcu_read_unlock(); |
0bc58a91 EB |
2782 | return pos; |
2783 | } | |
2784 | ||
2785 | /* | |
2786 | * Find the next thread in the thread list. | |
2787 | * Return NULL if there is an error or no next thread. | |
2788 | * | |
2789 | * The reference to the input task_struct is released. | |
2790 | */ | |
2791 | static struct task_struct *next_tid(struct task_struct *start) | |
2792 | { | |
c1df7fb8 | 2793 | struct task_struct *pos = NULL; |
cc288738 | 2794 | rcu_read_lock(); |
c1df7fb8 | 2795 | if (pid_alive(start)) { |
0bc58a91 | 2796 | pos = next_thread(start); |
c1df7fb8 ON |
2797 | if (thread_group_leader(pos)) |
2798 | pos = NULL; | |
2799 | else | |
2800 | get_task_struct(pos); | |
2801 | } | |
cc288738 | 2802 | rcu_read_unlock(); |
0bc58a91 EB |
2803 | put_task_struct(start); |
2804 | return pos; | |
1da177e4 LT |
2805 | } |
2806 | ||
61a28784 EB |
2807 | static int proc_task_fill_cache(struct file *filp, void *dirent, filldir_t filldir, |
2808 | struct task_struct *task, int tid) | |
2809 | { | |
2810 | char name[PROC_NUMBUF]; | |
2811 | int len = snprintf(name, sizeof(name), "%d", tid); | |
2812 | return proc_fill_cache(filp, dirent, filldir, name, len, | |
2813 | proc_task_instantiate, task, NULL); | |
2814 | } | |
2815 | ||
1da177e4 LT |
2816 | /* for the /proc/TGID/task/ directories */ |
2817 | static int proc_task_readdir(struct file * filp, void * dirent, filldir_t filldir) | |
2818 | { | |
2fddfeef | 2819 | struct dentry *dentry = filp->f_path.dentry; |
1da177e4 | 2820 | struct inode *inode = dentry->d_inode; |
7d895244 | 2821 | struct task_struct *leader = NULL; |
0bc58a91 | 2822 | struct task_struct *task; |
1da177e4 LT |
2823 | int retval = -ENOENT; |
2824 | ino_t ino; | |
0bc58a91 | 2825 | int tid; |
1da177e4 | 2826 | unsigned long pos = filp->f_pos; /* avoiding "long long" filp->f_pos */ |
b488893a | 2827 | struct pid_namespace *ns; |
1da177e4 | 2828 | |
7d895244 GC |
2829 | task = get_proc_task(inode); |
2830 | if (!task) | |
2831 | goto out_no_task; | |
2832 | rcu_read_lock(); | |
2833 | if (pid_alive(task)) { | |
2834 | leader = task->group_leader; | |
2835 | get_task_struct(leader); | |
2836 | } | |
2837 | rcu_read_unlock(); | |
2838 | put_task_struct(task); | |
99f89551 EB |
2839 | if (!leader) |
2840 | goto out_no_task; | |
1da177e4 LT |
2841 | retval = 0; |
2842 | ||
2843 | switch (pos) { | |
2844 | case 0: | |
2845 | ino = inode->i_ino; | |
2846 | if (filldir(dirent, ".", 1, pos, ino, DT_DIR) < 0) | |
2847 | goto out; | |
2848 | pos++; | |
2849 | /* fall through */ | |
2850 | case 1: | |
2851 | ino = parent_ino(dentry); | |
2852 | if (filldir(dirent, "..", 2, pos, ino, DT_DIR) < 0) | |
2853 | goto out; | |
2854 | pos++; | |
2855 | /* fall through */ | |
2856 | } | |
2857 | ||
0bc58a91 EB |
2858 | /* f_version caches the tgid value that the last readdir call couldn't |
2859 | * return. lseek aka telldir automagically resets f_version to 0. | |
2860 | */ | |
b488893a | 2861 | ns = filp->f_dentry->d_sb->s_fs_info; |
2b47c361 | 2862 | tid = (int)filp->f_version; |
0bc58a91 | 2863 | filp->f_version = 0; |
b488893a | 2864 | for (task = first_tid(leader, tid, pos - 2, ns); |
0bc58a91 EB |
2865 | task; |
2866 | task = next_tid(task), pos++) { | |
b488893a | 2867 | tid = task_pid_nr_ns(task, ns); |
61a28784 | 2868 | if (proc_task_fill_cache(filp, dirent, filldir, task, tid) < 0) { |
0bc58a91 EB |
2869 | /* returning this tgid failed, save it as the first |
2870 | * pid for the next readir call */ | |
2b47c361 | 2871 | filp->f_version = (u64)tid; |
0bc58a91 | 2872 | put_task_struct(task); |
1da177e4 | 2873 | break; |
0bc58a91 | 2874 | } |
1da177e4 LT |
2875 | } |
2876 | out: | |
2877 | filp->f_pos = pos; | |
99f89551 EB |
2878 | put_task_struct(leader); |
2879 | out_no_task: | |
1da177e4 LT |
2880 | return retval; |
2881 | } | |
6e66b52b EB |
2882 | |
2883 | static int proc_task_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) | |
2884 | { | |
2885 | struct inode *inode = dentry->d_inode; | |
99f89551 | 2886 | struct task_struct *p = get_proc_task(inode); |
6e66b52b EB |
2887 | generic_fillattr(inode, stat); |
2888 | ||
99f89551 EB |
2889 | if (p) { |
2890 | rcu_read_lock(); | |
2891 | stat->nlink += get_nr_threads(p); | |
2892 | rcu_read_unlock(); | |
2893 | put_task_struct(p); | |
6e66b52b EB |
2894 | } |
2895 | ||
2896 | return 0; | |
2897 | } | |
28a6d671 | 2898 | |
c5ef1c42 | 2899 | static const struct inode_operations proc_task_inode_operations = { |
28a6d671 EB |
2900 | .lookup = proc_task_lookup, |
2901 | .getattr = proc_task_getattr, | |
2902 | .setattr = proc_setattr, | |
2903 | }; | |
2904 | ||
00977a59 | 2905 | static const struct file_operations proc_task_operations = { |
28a6d671 EB |
2906 | .read = generic_read_dir, |
2907 | .readdir = proc_task_readdir, | |
2908 | }; |