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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> |
5096add8 | 66 | #include <linux/module.h> |
1da177e4 LT |
67 | #include <linux/mount.h> |
68 | #include <linux/security.h> | |
69 | #include <linux/ptrace.h> | |
1da177e4 LT |
70 | #include <linux/cpuset.h> |
71 | #include <linux/audit.h> | |
5addc5dd | 72 | #include <linux/poll.h> |
1651e14e | 73 | #include <linux/nsproxy.h> |
8ac773b4 | 74 | #include <linux/oom.h> |
3cb4a0bb | 75 | #include <linux/elf.h> |
1da177e4 LT |
76 | #include "internal.h" |
77 | ||
0f2fe20f EB |
78 | /* NOTE: |
79 | * Implementing inode permission operations in /proc is almost | |
80 | * certainly an error. Permission checks need to happen during | |
81 | * each system call not at open time. The reason is that most of | |
82 | * what we wish to check for permissions in /proc varies at runtime. | |
83 | * | |
84 | * The classic example of a problem is opening file descriptors | |
85 | * in /proc for a task before it execs a suid executable. | |
86 | */ | |
87 | ||
1da177e4 | 88 | |
8578cea7 | 89 | /* Worst case buffer size needed for holding an integer. */ |
0187f879 | 90 | #define PROC_NUMBUF 13 |
8578cea7 | 91 | |
1da177e4 | 92 | struct pid_entry { |
1da177e4 | 93 | char *name; |
c5141e6d | 94 | int len; |
1da177e4 | 95 | mode_t mode; |
c5ef1c42 | 96 | const struct inode_operations *iop; |
00977a59 | 97 | const struct file_operations *fop; |
20cdc894 | 98 | union proc_op op; |
1da177e4 LT |
99 | }; |
100 | ||
61a28784 | 101 | #define NOD(NAME, MODE, IOP, FOP, OP) { \ |
20cdc894 | 102 | .name = (NAME), \ |
c5141e6d | 103 | .len = sizeof(NAME) - 1, \ |
20cdc894 EB |
104 | .mode = MODE, \ |
105 | .iop = IOP, \ | |
106 | .fop = FOP, \ | |
107 | .op = OP, \ | |
108 | } | |
109 | ||
61a28784 EB |
110 | #define DIR(NAME, MODE, OTYPE) \ |
111 | NOD(NAME, (S_IFDIR|(MODE)), \ | |
20cdc894 EB |
112 | &proc_##OTYPE##_inode_operations, &proc_##OTYPE##_operations, \ |
113 | {} ) | |
61a28784 EB |
114 | #define LNK(NAME, OTYPE) \ |
115 | NOD(NAME, (S_IFLNK|S_IRWXUGO), \ | |
20cdc894 EB |
116 | &proc_pid_link_inode_operations, NULL, \ |
117 | { .proc_get_link = &proc_##OTYPE##_link } ) | |
61a28784 EB |
118 | #define REG(NAME, MODE, OTYPE) \ |
119 | NOD(NAME, (S_IFREG|(MODE)), NULL, \ | |
20cdc894 | 120 | &proc_##OTYPE##_operations, {}) |
61a28784 EB |
121 | #define INF(NAME, MODE, OTYPE) \ |
122 | NOD(NAME, (S_IFREG|(MODE)), \ | |
20cdc894 EB |
123 | NULL, &proc_info_file_operations, \ |
124 | { .proc_read = &proc_##OTYPE } ) | |
1da177e4 | 125 | |
5096add8 KC |
126 | int maps_protect; |
127 | EXPORT_SYMBOL(maps_protect); | |
128 | ||
0494f6ec | 129 | static struct fs_struct *get_fs_struct(struct task_struct *task) |
1da177e4 LT |
130 | { |
131 | struct fs_struct *fs; | |
0494f6ec MS |
132 | task_lock(task); |
133 | fs = task->fs; | |
1da177e4 LT |
134 | if(fs) |
135 | atomic_inc(&fs->count); | |
0494f6ec MS |
136 | task_unlock(task); |
137 | return fs; | |
138 | } | |
139 | ||
99f89551 EB |
140 | static int get_nr_threads(struct task_struct *tsk) |
141 | { | |
142 | /* Must be called with the rcu_read_lock held */ | |
143 | unsigned long flags; | |
144 | int count = 0; | |
145 | ||
146 | if (lock_task_sighand(tsk, &flags)) { | |
147 | count = atomic_read(&tsk->signal->count); | |
148 | unlock_task_sighand(tsk, &flags); | |
149 | } | |
150 | return count; | |
151 | } | |
152 | ||
0494f6ec MS |
153 | static int proc_cwd_link(struct inode *inode, struct dentry **dentry, struct vfsmount **mnt) |
154 | { | |
99f89551 EB |
155 | struct task_struct *task = get_proc_task(inode); |
156 | struct fs_struct *fs = NULL; | |
0494f6ec | 157 | int result = -ENOENT; |
99f89551 EB |
158 | |
159 | if (task) { | |
160 | fs = get_fs_struct(task); | |
161 | put_task_struct(task); | |
162 | } | |
1da177e4 LT |
163 | if (fs) { |
164 | read_lock(&fs->lock); | |
165 | *mnt = mntget(fs->pwdmnt); | |
166 | *dentry = dget(fs->pwd); | |
167 | read_unlock(&fs->lock); | |
168 | result = 0; | |
169 | put_fs_struct(fs); | |
170 | } | |
171 | return result; | |
172 | } | |
173 | ||
174 | static int proc_root_link(struct inode *inode, struct dentry **dentry, struct vfsmount **mnt) | |
175 | { | |
99f89551 EB |
176 | struct task_struct *task = get_proc_task(inode); |
177 | struct fs_struct *fs = NULL; | |
1da177e4 | 178 | int result = -ENOENT; |
99f89551 EB |
179 | |
180 | if (task) { | |
181 | fs = get_fs_struct(task); | |
182 | put_task_struct(task); | |
183 | } | |
1da177e4 LT |
184 | if (fs) { |
185 | read_lock(&fs->lock); | |
186 | *mnt = mntget(fs->rootmnt); | |
187 | *dentry = dget(fs->root); | |
188 | read_unlock(&fs->lock); | |
189 | result = 0; | |
190 | put_fs_struct(fs); | |
191 | } | |
192 | return result; | |
193 | } | |
194 | ||
195 | #define MAY_PTRACE(task) \ | |
196 | (task == current || \ | |
197 | (task->parent == current && \ | |
198 | (task->ptrace & PT_PTRACED) && \ | |
199 | (task->state == TASK_STOPPED || task->state == TASK_TRACED) && \ | |
200 | security_ptrace(current,task) == 0)) | |
201 | ||
1da177e4 LT |
202 | static int proc_pid_cmdline(struct task_struct *task, char * buffer) |
203 | { | |
204 | int res = 0; | |
205 | unsigned int len; | |
206 | struct mm_struct *mm = get_task_mm(task); | |
207 | if (!mm) | |
208 | goto out; | |
209 | if (!mm->arg_end) | |
210 | goto out_mm; /* Shh! No looking before we're done */ | |
211 | ||
212 | len = mm->arg_end - mm->arg_start; | |
213 | ||
214 | if (len > PAGE_SIZE) | |
215 | len = PAGE_SIZE; | |
216 | ||
217 | res = access_process_vm(task, mm->arg_start, buffer, len, 0); | |
218 | ||
219 | // If the nul at the end of args has been overwritten, then | |
220 | // assume application is using setproctitle(3). | |
221 | if (res > 0 && buffer[res-1] != '\0' && len < PAGE_SIZE) { | |
222 | len = strnlen(buffer, res); | |
223 | if (len < res) { | |
224 | res = len; | |
225 | } else { | |
226 | len = mm->env_end - mm->env_start; | |
227 | if (len > PAGE_SIZE - res) | |
228 | len = PAGE_SIZE - res; | |
229 | res += access_process_vm(task, mm->env_start, buffer+res, len, 0); | |
230 | res = strnlen(buffer, res); | |
231 | } | |
232 | } | |
233 | out_mm: | |
234 | mmput(mm); | |
235 | out: | |
236 | return res; | |
237 | } | |
238 | ||
239 | static int proc_pid_auxv(struct task_struct *task, char *buffer) | |
240 | { | |
241 | int res = 0; | |
242 | struct mm_struct *mm = get_task_mm(task); | |
243 | if (mm) { | |
244 | unsigned int nwords = 0; | |
245 | do | |
246 | nwords += 2; | |
247 | while (mm->saved_auxv[nwords - 2] != 0); /* AT_NULL */ | |
248 | res = nwords * sizeof(mm->saved_auxv[0]); | |
249 | if (res > PAGE_SIZE) | |
250 | res = PAGE_SIZE; | |
251 | memcpy(buffer, mm->saved_auxv, res); | |
252 | mmput(mm); | |
253 | } | |
254 | return res; | |
255 | } | |
256 | ||
257 | ||
258 | #ifdef CONFIG_KALLSYMS | |
259 | /* | |
260 | * Provides a wchan file via kallsyms in a proper one-value-per-file format. | |
261 | * Returns the resolved symbol. If that fails, simply return the address. | |
262 | */ | |
263 | static int proc_pid_wchan(struct task_struct *task, char *buffer) | |
264 | { | |
ffb45122 | 265 | unsigned long wchan; |
9281acea | 266 | char symname[KSYM_NAME_LEN]; |
1da177e4 LT |
267 | |
268 | wchan = get_wchan(task); | |
269 | ||
9d65cb4a AD |
270 | if (lookup_symbol_name(wchan, symname) < 0) |
271 | return sprintf(buffer, "%lu", wchan); | |
272 | else | |
273 | return sprintf(buffer, "%s", symname); | |
1da177e4 LT |
274 | } |
275 | #endif /* CONFIG_KALLSYMS */ | |
276 | ||
277 | #ifdef CONFIG_SCHEDSTATS | |
278 | /* | |
279 | * Provides /proc/PID/schedstat | |
280 | */ | |
281 | static int proc_pid_schedstat(struct task_struct *task, char *buffer) | |
282 | { | |
172ba844 | 283 | return sprintf(buffer, "%llu %llu %lu\n", |
1da177e4 LT |
284 | task->sched_info.cpu_time, |
285 | task->sched_info.run_delay, | |
2d72376b | 286 | task->sched_info.pcount); |
1da177e4 LT |
287 | } |
288 | #endif | |
289 | ||
290 | /* The badness from the OOM killer */ | |
291 | unsigned long badness(struct task_struct *p, unsigned long uptime); | |
292 | static int proc_oom_score(struct task_struct *task, char *buffer) | |
293 | { | |
294 | unsigned long points; | |
295 | struct timespec uptime; | |
296 | ||
297 | do_posix_clock_monotonic_gettime(&uptime); | |
19c5d45a | 298 | read_lock(&tasklist_lock); |
1da177e4 | 299 | points = badness(task, uptime.tv_sec); |
19c5d45a | 300 | read_unlock(&tasklist_lock); |
1da177e4 LT |
301 | return sprintf(buffer, "%lu\n", points); |
302 | } | |
303 | ||
304 | /************************************************************************/ | |
305 | /* Here the fs part begins */ | |
306 | /************************************************************************/ | |
307 | ||
308 | /* permission checks */ | |
778c1144 | 309 | static int proc_fd_access_allowed(struct inode *inode) |
1da177e4 | 310 | { |
778c1144 EB |
311 | struct task_struct *task; |
312 | int allowed = 0; | |
df26c40e EB |
313 | /* Allow access to a task's file descriptors if it is us or we |
314 | * may use ptrace attach to the process and find out that | |
315 | * information. | |
778c1144 EB |
316 | */ |
317 | task = get_proc_task(inode); | |
df26c40e EB |
318 | if (task) { |
319 | allowed = ptrace_may_attach(task); | |
778c1144 | 320 | put_task_struct(task); |
df26c40e | 321 | } |
778c1144 | 322 | return allowed; |
1da177e4 LT |
323 | } |
324 | ||
6d76fa58 LT |
325 | static int proc_setattr(struct dentry *dentry, struct iattr *attr) |
326 | { | |
327 | int error; | |
328 | struct inode *inode = dentry->d_inode; | |
329 | ||
330 | if (attr->ia_valid & ATTR_MODE) | |
331 | return -EPERM; | |
332 | ||
333 | error = inode_change_ok(inode, attr); | |
1e8123fd JJ |
334 | if (!error) |
335 | error = inode_setattr(inode, attr); | |
6d76fa58 LT |
336 | return error; |
337 | } | |
338 | ||
c5ef1c42 | 339 | static const struct inode_operations proc_def_inode_operations = { |
6d76fa58 LT |
340 | .setattr = proc_setattr, |
341 | }; | |
342 | ||
1da177e4 | 343 | extern struct seq_operations mounts_op; |
5addc5dd AV |
344 | struct proc_mounts { |
345 | struct seq_file m; | |
346 | int event; | |
347 | }; | |
348 | ||
1da177e4 LT |
349 | static int mounts_open(struct inode *inode, struct file *file) |
350 | { | |
99f89551 | 351 | struct task_struct *task = get_proc_task(inode); |
6b3286ed | 352 | struct mnt_namespace *ns = NULL; |
5addc5dd AV |
353 | struct proc_mounts *p; |
354 | int ret = -EINVAL; | |
1da177e4 | 355 | |
99f89551 EB |
356 | if (task) { |
357 | task_lock(task); | |
863c4702 AD |
358 | if (task->nsproxy) { |
359 | ns = task->nsproxy->mnt_ns; | |
360 | if (ns) | |
361 | get_mnt_ns(ns); | |
362 | } | |
99f89551 EB |
363 | task_unlock(task); |
364 | put_task_struct(task); | |
365 | } | |
5addc5dd | 366 | |
6b3286ed | 367 | if (ns) { |
5addc5dd AV |
368 | ret = -ENOMEM; |
369 | p = kmalloc(sizeof(struct proc_mounts), GFP_KERNEL); | |
370 | if (p) { | |
371 | file->private_data = &p->m; | |
372 | ret = seq_open(file, &mounts_op); | |
373 | if (!ret) { | |
6b3286ed KK |
374 | p->m.private = ns; |
375 | p->event = ns->event; | |
5addc5dd AV |
376 | return 0; |
377 | } | |
378 | kfree(p); | |
1da177e4 | 379 | } |
6b3286ed | 380 | put_mnt_ns(ns); |
1da177e4 LT |
381 | } |
382 | return ret; | |
383 | } | |
384 | ||
385 | static int mounts_release(struct inode *inode, struct file *file) | |
386 | { | |
387 | struct seq_file *m = file->private_data; | |
6b3286ed KK |
388 | struct mnt_namespace *ns = m->private; |
389 | put_mnt_ns(ns); | |
1da177e4 LT |
390 | return seq_release(inode, file); |
391 | } | |
392 | ||
5addc5dd AV |
393 | static unsigned mounts_poll(struct file *file, poll_table *wait) |
394 | { | |
395 | struct proc_mounts *p = file->private_data; | |
6b3286ed | 396 | struct mnt_namespace *ns = p->m.private; |
5addc5dd AV |
397 | unsigned res = 0; |
398 | ||
399 | poll_wait(file, &ns->poll, wait); | |
400 | ||
401 | spin_lock(&vfsmount_lock); | |
402 | if (p->event != ns->event) { | |
403 | p->event = ns->event; | |
404 | res = POLLERR; | |
405 | } | |
406 | spin_unlock(&vfsmount_lock); | |
407 | ||
408 | return res; | |
409 | } | |
410 | ||
00977a59 | 411 | static const struct file_operations proc_mounts_operations = { |
1da177e4 LT |
412 | .open = mounts_open, |
413 | .read = seq_read, | |
414 | .llseek = seq_lseek, | |
415 | .release = mounts_release, | |
5addc5dd | 416 | .poll = mounts_poll, |
1da177e4 LT |
417 | }; |
418 | ||
b4629fe2 CL |
419 | extern struct seq_operations mountstats_op; |
420 | static int mountstats_open(struct inode *inode, struct file *file) | |
421 | { | |
b4629fe2 CL |
422 | int ret = seq_open(file, &mountstats_op); |
423 | ||
424 | if (!ret) { | |
425 | struct seq_file *m = file->private_data; | |
6b3286ed | 426 | struct mnt_namespace *mnt_ns = NULL; |
99f89551 EB |
427 | struct task_struct *task = get_proc_task(inode); |
428 | ||
429 | if (task) { | |
430 | task_lock(task); | |
701e054e | 431 | if (task->nsproxy) |
6b3286ed KK |
432 | mnt_ns = task->nsproxy->mnt_ns; |
433 | if (mnt_ns) | |
434 | get_mnt_ns(mnt_ns); | |
99f89551 EB |
435 | task_unlock(task); |
436 | put_task_struct(task); | |
437 | } | |
b4629fe2 | 438 | |
6b3286ed KK |
439 | if (mnt_ns) |
440 | m->private = mnt_ns; | |
b4629fe2 CL |
441 | else { |
442 | seq_release(inode, file); | |
443 | ret = -EINVAL; | |
444 | } | |
445 | } | |
446 | return ret; | |
447 | } | |
448 | ||
00977a59 | 449 | static const struct file_operations proc_mountstats_operations = { |
b4629fe2 CL |
450 | .open = mountstats_open, |
451 | .read = seq_read, | |
452 | .llseek = seq_lseek, | |
453 | .release = mounts_release, | |
454 | }; | |
455 | ||
1da177e4 LT |
456 | #define PROC_BLOCK_SIZE (3*1024) /* 4K page size but our output routines use some slack for overruns */ |
457 | ||
458 | static ssize_t proc_info_read(struct file * file, char __user * buf, | |
459 | size_t count, loff_t *ppos) | |
460 | { | |
2fddfeef | 461 | struct inode * inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
462 | unsigned long page; |
463 | ssize_t length; | |
99f89551 EB |
464 | struct task_struct *task = get_proc_task(inode); |
465 | ||
466 | length = -ESRCH; | |
467 | if (!task) | |
468 | goto out_no_task; | |
1da177e4 LT |
469 | |
470 | if (count > PROC_BLOCK_SIZE) | |
471 | count = PROC_BLOCK_SIZE; | |
99f89551 EB |
472 | |
473 | length = -ENOMEM; | |
e12ba74d | 474 | if (!(page = __get_free_page(GFP_TEMPORARY))) |
99f89551 | 475 | goto out; |
1da177e4 LT |
476 | |
477 | length = PROC_I(inode)->op.proc_read(task, (char*)page); | |
478 | ||
479 | if (length >= 0) | |
480 | length = simple_read_from_buffer(buf, count, ppos, (char *)page, length); | |
481 | free_page(page); | |
99f89551 EB |
482 | out: |
483 | put_task_struct(task); | |
484 | out_no_task: | |
1da177e4 LT |
485 | return length; |
486 | } | |
487 | ||
00977a59 | 488 | static const struct file_operations proc_info_file_operations = { |
1da177e4 LT |
489 | .read = proc_info_read, |
490 | }; | |
491 | ||
492 | static int mem_open(struct inode* inode, struct file* file) | |
493 | { | |
494 | file->private_data = (void*)((long)current->self_exec_id); | |
495 | return 0; | |
496 | } | |
497 | ||
498 | static ssize_t mem_read(struct file * file, char __user * buf, | |
499 | size_t count, loff_t *ppos) | |
500 | { | |
2fddfeef | 501 | struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode); |
1da177e4 LT |
502 | char *page; |
503 | unsigned long src = *ppos; | |
504 | int ret = -ESRCH; | |
505 | struct mm_struct *mm; | |
506 | ||
99f89551 EB |
507 | if (!task) |
508 | goto out_no_task; | |
509 | ||
ab8d11be | 510 | if (!MAY_PTRACE(task) || !ptrace_may_attach(task)) |
1da177e4 LT |
511 | goto out; |
512 | ||
513 | ret = -ENOMEM; | |
e12ba74d | 514 | page = (char *)__get_free_page(GFP_TEMPORARY); |
1da177e4 LT |
515 | if (!page) |
516 | goto out; | |
517 | ||
518 | ret = 0; | |
519 | ||
520 | mm = get_task_mm(task); | |
521 | if (!mm) | |
522 | goto out_free; | |
523 | ||
524 | ret = -EIO; | |
525 | ||
526 | if (file->private_data != (void*)((long)current->self_exec_id)) | |
527 | goto out_put; | |
528 | ||
529 | ret = 0; | |
530 | ||
531 | while (count > 0) { | |
532 | int this_len, retval; | |
533 | ||
534 | this_len = (count > PAGE_SIZE) ? PAGE_SIZE : count; | |
535 | retval = access_process_vm(task, src, page, this_len, 0); | |
ab8d11be | 536 | if (!retval || !MAY_PTRACE(task) || !ptrace_may_attach(task)) { |
1da177e4 LT |
537 | if (!ret) |
538 | ret = -EIO; | |
539 | break; | |
540 | } | |
541 | ||
542 | if (copy_to_user(buf, page, retval)) { | |
543 | ret = -EFAULT; | |
544 | break; | |
545 | } | |
546 | ||
547 | ret += retval; | |
548 | src += retval; | |
549 | buf += retval; | |
550 | count -= retval; | |
551 | } | |
552 | *ppos = src; | |
553 | ||
554 | out_put: | |
555 | mmput(mm); | |
556 | out_free: | |
557 | free_page((unsigned long) page); | |
558 | out: | |
99f89551 EB |
559 | put_task_struct(task); |
560 | out_no_task: | |
1da177e4 LT |
561 | return ret; |
562 | } | |
563 | ||
564 | #define mem_write NULL | |
565 | ||
566 | #ifndef mem_write | |
567 | /* This is a security hazard */ | |
63967fa9 | 568 | static ssize_t mem_write(struct file * file, const char __user *buf, |
1da177e4 LT |
569 | size_t count, loff_t *ppos) |
570 | { | |
f7ca54f4 | 571 | int copied; |
1da177e4 | 572 | char *page; |
2fddfeef | 573 | struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode); |
1da177e4 LT |
574 | unsigned long dst = *ppos; |
575 | ||
99f89551 EB |
576 | copied = -ESRCH; |
577 | if (!task) | |
578 | goto out_no_task; | |
579 | ||
ab8d11be | 580 | if (!MAY_PTRACE(task) || !ptrace_may_attach(task)) |
99f89551 | 581 | goto out; |
1da177e4 | 582 | |
99f89551 | 583 | copied = -ENOMEM; |
e12ba74d | 584 | page = (char *)__get_free_page(GFP_TEMPORARY); |
1da177e4 | 585 | if (!page) |
99f89551 | 586 | goto out; |
1da177e4 | 587 | |
f7ca54f4 | 588 | copied = 0; |
1da177e4 LT |
589 | while (count > 0) { |
590 | int this_len, retval; | |
591 | ||
592 | this_len = (count > PAGE_SIZE) ? PAGE_SIZE : count; | |
593 | if (copy_from_user(page, buf, this_len)) { | |
594 | copied = -EFAULT; | |
595 | break; | |
596 | } | |
597 | retval = access_process_vm(task, dst, page, this_len, 1); | |
598 | if (!retval) { | |
599 | if (!copied) | |
600 | copied = -EIO; | |
601 | break; | |
602 | } | |
603 | copied += retval; | |
604 | buf += retval; | |
605 | dst += retval; | |
606 | count -= retval; | |
607 | } | |
608 | *ppos = dst; | |
609 | free_page((unsigned long) page); | |
99f89551 EB |
610 | out: |
611 | put_task_struct(task); | |
612 | out_no_task: | |
1da177e4 LT |
613 | return copied; |
614 | } | |
615 | #endif | |
616 | ||
617 | static loff_t mem_lseek(struct file * file, loff_t offset, int orig) | |
618 | { | |
619 | switch (orig) { | |
620 | case 0: | |
621 | file->f_pos = offset; | |
622 | break; | |
623 | case 1: | |
624 | file->f_pos += offset; | |
625 | break; | |
626 | default: | |
627 | return -EINVAL; | |
628 | } | |
629 | force_successful_syscall_return(); | |
630 | return file->f_pos; | |
631 | } | |
632 | ||
00977a59 | 633 | static const struct file_operations proc_mem_operations = { |
1da177e4 LT |
634 | .llseek = mem_lseek, |
635 | .read = mem_read, | |
636 | .write = mem_write, | |
637 | .open = mem_open, | |
638 | }; | |
639 | ||
315e28c8 JP |
640 | static ssize_t environ_read(struct file *file, char __user *buf, |
641 | size_t count, loff_t *ppos) | |
642 | { | |
643 | struct task_struct *task = get_proc_task(file->f_dentry->d_inode); | |
644 | char *page; | |
645 | unsigned long src = *ppos; | |
646 | int ret = -ESRCH; | |
647 | struct mm_struct *mm; | |
648 | ||
649 | if (!task) | |
650 | goto out_no_task; | |
651 | ||
652 | if (!ptrace_may_attach(task)) | |
653 | goto out; | |
654 | ||
655 | ret = -ENOMEM; | |
656 | page = (char *)__get_free_page(GFP_TEMPORARY); | |
657 | if (!page) | |
658 | goto out; | |
659 | ||
660 | ret = 0; | |
661 | ||
662 | mm = get_task_mm(task); | |
663 | if (!mm) | |
664 | goto out_free; | |
665 | ||
666 | while (count > 0) { | |
667 | int this_len, retval, max_len; | |
668 | ||
669 | this_len = mm->env_end - (mm->env_start + src); | |
670 | ||
671 | if (this_len <= 0) | |
672 | break; | |
673 | ||
674 | max_len = (count > PAGE_SIZE) ? PAGE_SIZE : count; | |
675 | this_len = (this_len > max_len) ? max_len : this_len; | |
676 | ||
677 | retval = access_process_vm(task, (mm->env_start + src), | |
678 | page, this_len, 0); | |
679 | ||
680 | if (retval <= 0) { | |
681 | ret = retval; | |
682 | break; | |
683 | } | |
684 | ||
685 | if (copy_to_user(buf, page, retval)) { | |
686 | ret = -EFAULT; | |
687 | break; | |
688 | } | |
689 | ||
690 | ret += retval; | |
691 | src += retval; | |
692 | buf += retval; | |
693 | count -= retval; | |
694 | } | |
695 | *ppos = src; | |
696 | ||
697 | mmput(mm); | |
698 | out_free: | |
699 | free_page((unsigned long) page); | |
700 | out: | |
701 | put_task_struct(task); | |
702 | out_no_task: | |
703 | return ret; | |
704 | } | |
705 | ||
706 | static const struct file_operations proc_environ_operations = { | |
707 | .read = environ_read, | |
708 | }; | |
709 | ||
1da177e4 LT |
710 | static ssize_t oom_adjust_read(struct file *file, char __user *buf, |
711 | size_t count, loff_t *ppos) | |
712 | { | |
2fddfeef | 713 | struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode); |
8578cea7 | 714 | char buffer[PROC_NUMBUF]; |
1da177e4 | 715 | size_t len; |
99f89551 | 716 | int oom_adjust; |
1da177e4 | 717 | |
99f89551 EB |
718 | if (!task) |
719 | return -ESRCH; | |
720 | oom_adjust = task->oomkilladj; | |
721 | put_task_struct(task); | |
722 | ||
8578cea7 | 723 | len = snprintf(buffer, sizeof(buffer), "%i\n", oom_adjust); |
0c28f287 AM |
724 | |
725 | return simple_read_from_buffer(buf, count, ppos, buffer, len); | |
1da177e4 LT |
726 | } |
727 | ||
728 | static ssize_t oom_adjust_write(struct file *file, const char __user *buf, | |
729 | size_t count, loff_t *ppos) | |
730 | { | |
99f89551 | 731 | struct task_struct *task; |
8578cea7 | 732 | char buffer[PROC_NUMBUF], *end; |
1da177e4 LT |
733 | int oom_adjust; |
734 | ||
8578cea7 EB |
735 | memset(buffer, 0, sizeof(buffer)); |
736 | if (count > sizeof(buffer) - 1) | |
737 | count = sizeof(buffer) - 1; | |
1da177e4 LT |
738 | if (copy_from_user(buffer, buf, count)) |
739 | return -EFAULT; | |
740 | oom_adjust = simple_strtol(buffer, &end, 0); | |
8ac773b4 AD |
741 | if ((oom_adjust < OOM_ADJUST_MIN || oom_adjust > OOM_ADJUST_MAX) && |
742 | oom_adjust != OOM_DISABLE) | |
1da177e4 LT |
743 | return -EINVAL; |
744 | if (*end == '\n') | |
745 | end++; | |
2fddfeef | 746 | task = get_proc_task(file->f_path.dentry->d_inode); |
99f89551 EB |
747 | if (!task) |
748 | return -ESRCH; | |
8fb4fc68 GJ |
749 | if (oom_adjust < task->oomkilladj && !capable(CAP_SYS_RESOURCE)) { |
750 | put_task_struct(task); | |
751 | return -EACCES; | |
752 | } | |
1da177e4 | 753 | task->oomkilladj = oom_adjust; |
99f89551 | 754 | put_task_struct(task); |
1da177e4 LT |
755 | if (end - buffer == 0) |
756 | return -EIO; | |
757 | return end - buffer; | |
758 | } | |
759 | ||
00977a59 | 760 | static const struct file_operations proc_oom_adjust_operations = { |
1da177e4 LT |
761 | .read = oom_adjust_read, |
762 | .write = oom_adjust_write, | |
763 | }; | |
764 | ||
4b8df891 | 765 | #ifdef CONFIG_MMU |
b813e931 DR |
766 | static ssize_t clear_refs_write(struct file *file, const char __user *buf, |
767 | size_t count, loff_t *ppos) | |
768 | { | |
769 | struct task_struct *task; | |
770 | char buffer[PROC_NUMBUF], *end; | |
771 | struct mm_struct *mm; | |
772 | ||
773 | memset(buffer, 0, sizeof(buffer)); | |
774 | if (count > sizeof(buffer) - 1) | |
775 | count = sizeof(buffer) - 1; | |
776 | if (copy_from_user(buffer, buf, count)) | |
777 | return -EFAULT; | |
778 | if (!simple_strtol(buffer, &end, 0)) | |
779 | return -EINVAL; | |
780 | if (*end == '\n') | |
781 | end++; | |
782 | task = get_proc_task(file->f_path.dentry->d_inode); | |
783 | if (!task) | |
784 | return -ESRCH; | |
785 | mm = get_task_mm(task); | |
786 | if (mm) { | |
787 | clear_refs_smap(mm); | |
788 | mmput(mm); | |
789 | } | |
790 | put_task_struct(task); | |
791 | if (end - buffer == 0) | |
792 | return -EIO; | |
793 | return end - buffer; | |
794 | } | |
795 | ||
796 | static struct file_operations proc_clear_refs_operations = { | |
797 | .write = clear_refs_write, | |
798 | }; | |
4b8df891 | 799 | #endif |
b813e931 | 800 | |
1da177e4 LT |
801 | #ifdef CONFIG_AUDITSYSCALL |
802 | #define TMPBUFLEN 21 | |
803 | static ssize_t proc_loginuid_read(struct file * file, char __user * buf, | |
804 | size_t count, loff_t *ppos) | |
805 | { | |
2fddfeef | 806 | struct inode * inode = file->f_path.dentry->d_inode; |
99f89551 | 807 | struct task_struct *task = get_proc_task(inode); |
1da177e4 LT |
808 | ssize_t length; |
809 | char tmpbuf[TMPBUFLEN]; | |
810 | ||
99f89551 EB |
811 | if (!task) |
812 | return -ESRCH; | |
1da177e4 LT |
813 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", |
814 | audit_get_loginuid(task->audit_context)); | |
99f89551 | 815 | put_task_struct(task); |
1da177e4 LT |
816 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); |
817 | } | |
818 | ||
819 | static ssize_t proc_loginuid_write(struct file * file, const char __user * buf, | |
820 | size_t count, loff_t *ppos) | |
821 | { | |
2fddfeef | 822 | struct inode * inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
823 | char *page, *tmp; |
824 | ssize_t length; | |
1da177e4 LT |
825 | uid_t loginuid; |
826 | ||
827 | if (!capable(CAP_AUDIT_CONTROL)) | |
828 | return -EPERM; | |
829 | ||
13b41b09 | 830 | if (current != pid_task(proc_pid(inode), PIDTYPE_PID)) |
1da177e4 LT |
831 | return -EPERM; |
832 | ||
e0182909 AV |
833 | if (count >= PAGE_SIZE) |
834 | count = PAGE_SIZE - 1; | |
1da177e4 LT |
835 | |
836 | if (*ppos != 0) { | |
837 | /* No partial writes. */ | |
838 | return -EINVAL; | |
839 | } | |
e12ba74d | 840 | page = (char*)__get_free_page(GFP_TEMPORARY); |
1da177e4 LT |
841 | if (!page) |
842 | return -ENOMEM; | |
843 | length = -EFAULT; | |
844 | if (copy_from_user(page, buf, count)) | |
845 | goto out_free_page; | |
846 | ||
e0182909 | 847 | page[count] = '\0'; |
1da177e4 LT |
848 | loginuid = simple_strtoul(page, &tmp, 10); |
849 | if (tmp == page) { | |
850 | length = -EINVAL; | |
851 | goto out_free_page; | |
852 | ||
853 | } | |
99f89551 | 854 | length = audit_set_loginuid(current, loginuid); |
1da177e4 LT |
855 | if (likely(length == 0)) |
856 | length = count; | |
857 | ||
858 | out_free_page: | |
859 | free_page((unsigned long) page); | |
860 | return length; | |
861 | } | |
862 | ||
00977a59 | 863 | static const struct file_operations proc_loginuid_operations = { |
1da177e4 LT |
864 | .read = proc_loginuid_read, |
865 | .write = proc_loginuid_write, | |
866 | }; | |
867 | #endif | |
868 | ||
f4f154fd AM |
869 | #ifdef CONFIG_FAULT_INJECTION |
870 | static ssize_t proc_fault_inject_read(struct file * file, char __user * buf, | |
871 | size_t count, loff_t *ppos) | |
872 | { | |
873 | struct task_struct *task = get_proc_task(file->f_dentry->d_inode); | |
874 | char buffer[PROC_NUMBUF]; | |
875 | size_t len; | |
876 | int make_it_fail; | |
f4f154fd AM |
877 | |
878 | if (!task) | |
879 | return -ESRCH; | |
880 | make_it_fail = task->make_it_fail; | |
881 | put_task_struct(task); | |
882 | ||
883 | len = snprintf(buffer, sizeof(buffer), "%i\n", make_it_fail); | |
0c28f287 AM |
884 | |
885 | return simple_read_from_buffer(buf, count, ppos, buffer, len); | |
f4f154fd AM |
886 | } |
887 | ||
888 | static ssize_t proc_fault_inject_write(struct file * file, | |
889 | const char __user * buf, size_t count, loff_t *ppos) | |
890 | { | |
891 | struct task_struct *task; | |
892 | char buffer[PROC_NUMBUF], *end; | |
893 | int make_it_fail; | |
894 | ||
895 | if (!capable(CAP_SYS_RESOURCE)) | |
896 | return -EPERM; | |
897 | memset(buffer, 0, sizeof(buffer)); | |
898 | if (count > sizeof(buffer) - 1) | |
899 | count = sizeof(buffer) - 1; | |
900 | if (copy_from_user(buffer, buf, count)) | |
901 | return -EFAULT; | |
902 | make_it_fail = simple_strtol(buffer, &end, 0); | |
903 | if (*end == '\n') | |
904 | end++; | |
905 | task = get_proc_task(file->f_dentry->d_inode); | |
906 | if (!task) | |
907 | return -ESRCH; | |
908 | task->make_it_fail = make_it_fail; | |
909 | put_task_struct(task); | |
910 | if (end - buffer == 0) | |
911 | return -EIO; | |
912 | return end - buffer; | |
913 | } | |
914 | ||
00977a59 | 915 | static const struct file_operations proc_fault_inject_operations = { |
f4f154fd AM |
916 | .read = proc_fault_inject_read, |
917 | .write = proc_fault_inject_write, | |
918 | }; | |
919 | #endif | |
920 | ||
43ae34cb IM |
921 | #ifdef CONFIG_SCHED_DEBUG |
922 | /* | |
923 | * Print out various scheduling related per-task fields: | |
924 | */ | |
925 | static int sched_show(struct seq_file *m, void *v) | |
926 | { | |
927 | struct inode *inode = m->private; | |
928 | struct task_struct *p; | |
929 | ||
930 | WARN_ON(!inode); | |
931 | ||
932 | p = get_proc_task(inode); | |
933 | if (!p) | |
934 | return -ESRCH; | |
935 | proc_sched_show_task(p, m); | |
936 | ||
937 | put_task_struct(p); | |
938 | ||
939 | return 0; | |
940 | } | |
941 | ||
942 | static ssize_t | |
943 | sched_write(struct file *file, const char __user *buf, | |
944 | size_t count, loff_t *offset) | |
945 | { | |
946 | struct inode *inode = file->f_path.dentry->d_inode; | |
947 | struct task_struct *p; | |
948 | ||
949 | WARN_ON(!inode); | |
950 | ||
951 | p = get_proc_task(inode); | |
952 | if (!p) | |
953 | return -ESRCH; | |
954 | proc_sched_set_task(p); | |
955 | ||
956 | put_task_struct(p); | |
957 | ||
958 | return count; | |
959 | } | |
960 | ||
961 | static int sched_open(struct inode *inode, struct file *filp) | |
962 | { | |
963 | int ret; | |
964 | ||
965 | ret = single_open(filp, sched_show, NULL); | |
966 | if (!ret) { | |
967 | struct seq_file *m = filp->private_data; | |
968 | ||
969 | m->private = inode; | |
970 | } | |
971 | return ret; | |
972 | } | |
973 | ||
974 | static const struct file_operations proc_pid_sched_operations = { | |
975 | .open = sched_open, | |
976 | .read = seq_read, | |
977 | .write = sched_write, | |
978 | .llseek = seq_lseek, | |
5ea473a1 | 979 | .release = single_release, |
43ae34cb IM |
980 | }; |
981 | ||
982 | #endif | |
983 | ||
008b150a | 984 | static void *proc_pid_follow_link(struct dentry *dentry, struct nameidata *nd) |
1da177e4 LT |
985 | { |
986 | struct inode *inode = dentry->d_inode; | |
987 | int error = -EACCES; | |
988 | ||
989 | /* We don't need a base pointer in the /proc filesystem */ | |
990 | path_release(nd); | |
991 | ||
778c1144 EB |
992 | /* Are we allowed to snoop on the tasks file descriptors? */ |
993 | if (!proc_fd_access_allowed(inode)) | |
1da177e4 | 994 | goto out; |
1da177e4 LT |
995 | |
996 | error = PROC_I(inode)->op.proc_get_link(inode, &nd->dentry, &nd->mnt); | |
997 | nd->last_type = LAST_BIND; | |
998 | out: | |
008b150a | 999 | return ERR_PTR(error); |
1da177e4 LT |
1000 | } |
1001 | ||
1002 | static int do_proc_readlink(struct dentry *dentry, struct vfsmount *mnt, | |
1003 | char __user *buffer, int buflen) | |
1004 | { | |
1005 | struct inode * inode; | |
e12ba74d MG |
1006 | char *tmp = (char*)__get_free_page(GFP_TEMPORARY); |
1007 | char *path; | |
1da177e4 LT |
1008 | int len; |
1009 | ||
1010 | if (!tmp) | |
1011 | return -ENOMEM; | |
0c28f287 | 1012 | |
1da177e4 LT |
1013 | inode = dentry->d_inode; |
1014 | path = d_path(dentry, mnt, tmp, PAGE_SIZE); | |
1015 | len = PTR_ERR(path); | |
1016 | if (IS_ERR(path)) | |
1017 | goto out; | |
1018 | len = tmp + PAGE_SIZE - 1 - path; | |
1019 | ||
1020 | if (len > buflen) | |
1021 | len = buflen; | |
1022 | if (copy_to_user(buffer, path, len)) | |
1023 | len = -EFAULT; | |
1024 | out: | |
1025 | free_page((unsigned long)tmp); | |
1026 | return len; | |
1027 | } | |
1028 | ||
1029 | static int proc_pid_readlink(struct dentry * dentry, char __user * buffer, int buflen) | |
1030 | { | |
1031 | int error = -EACCES; | |
1032 | struct inode *inode = dentry->d_inode; | |
1033 | struct dentry *de; | |
1034 | struct vfsmount *mnt = NULL; | |
1035 | ||
778c1144 EB |
1036 | /* Are we allowed to snoop on the tasks file descriptors? */ |
1037 | if (!proc_fd_access_allowed(inode)) | |
1da177e4 | 1038 | goto out; |
1da177e4 LT |
1039 | |
1040 | error = PROC_I(inode)->op.proc_get_link(inode, &de, &mnt); | |
1041 | if (error) | |
1042 | goto out; | |
1043 | ||
1044 | error = do_proc_readlink(de, mnt, buffer, buflen); | |
1045 | dput(de); | |
1046 | mntput(mnt); | |
1047 | out: | |
1da177e4 LT |
1048 | return error; |
1049 | } | |
1050 | ||
c5ef1c42 | 1051 | static const struct inode_operations proc_pid_link_inode_operations = { |
1da177e4 | 1052 | .readlink = proc_pid_readlink, |
6d76fa58 LT |
1053 | .follow_link = proc_pid_follow_link, |
1054 | .setattr = proc_setattr, | |
1da177e4 LT |
1055 | }; |
1056 | ||
28a6d671 EB |
1057 | |
1058 | /* building an inode */ | |
1059 | ||
1060 | static int task_dumpable(struct task_struct *task) | |
1da177e4 | 1061 | { |
28a6d671 EB |
1062 | int dumpable = 0; |
1063 | struct mm_struct *mm; | |
1da177e4 | 1064 | |
28a6d671 EB |
1065 | task_lock(task); |
1066 | mm = task->mm; | |
1067 | if (mm) | |
6c5d5238 | 1068 | dumpable = get_dumpable(mm); |
28a6d671 EB |
1069 | task_unlock(task); |
1070 | if(dumpable == 1) | |
1071 | return 1; | |
1072 | return 0; | |
1073 | } | |
1da177e4 | 1074 | |
1da177e4 | 1075 | |
61a28784 | 1076 | static struct inode *proc_pid_make_inode(struct super_block * sb, struct task_struct *task) |
28a6d671 EB |
1077 | { |
1078 | struct inode * inode; | |
1079 | struct proc_inode *ei; | |
1da177e4 | 1080 | |
28a6d671 | 1081 | /* We need a new inode */ |
1da177e4 | 1082 | |
28a6d671 EB |
1083 | inode = new_inode(sb); |
1084 | if (!inode) | |
1085 | goto out; | |
1086 | ||
1087 | /* Common stuff */ | |
1088 | ei = PROC_I(inode); | |
1089 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; | |
28a6d671 EB |
1090 | inode->i_op = &proc_def_inode_operations; |
1091 | ||
1092 | /* | |
1093 | * grab the reference to task. | |
1094 | */ | |
1a657f78 | 1095 | ei->pid = get_task_pid(task, PIDTYPE_PID); |
28a6d671 EB |
1096 | if (!ei->pid) |
1097 | goto out_unlock; | |
1098 | ||
1099 | inode->i_uid = 0; | |
1100 | inode->i_gid = 0; | |
1101 | if (task_dumpable(task)) { | |
1102 | inode->i_uid = task->euid; | |
1103 | inode->i_gid = task->egid; | |
1da177e4 | 1104 | } |
28a6d671 EB |
1105 | security_task_to_inode(task, inode); |
1106 | ||
1da177e4 | 1107 | out: |
28a6d671 EB |
1108 | return inode; |
1109 | ||
1110 | out_unlock: | |
1111 | iput(inode); | |
1112 | return NULL; | |
1da177e4 LT |
1113 | } |
1114 | ||
28a6d671 | 1115 | static int pid_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) |
1da177e4 | 1116 | { |
1da177e4 | 1117 | struct inode *inode = dentry->d_inode; |
28a6d671 EB |
1118 | struct task_struct *task; |
1119 | generic_fillattr(inode, stat); | |
1da177e4 | 1120 | |
28a6d671 EB |
1121 | rcu_read_lock(); |
1122 | stat->uid = 0; | |
1123 | stat->gid = 0; | |
1124 | task = pid_task(proc_pid(inode), PIDTYPE_PID); | |
1125 | if (task) { | |
1126 | if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) || | |
1127 | task_dumpable(task)) { | |
1128 | stat->uid = task->euid; | |
1129 | stat->gid = task->egid; | |
1da177e4 LT |
1130 | } |
1131 | } | |
28a6d671 | 1132 | rcu_read_unlock(); |
d6e71144 | 1133 | return 0; |
1da177e4 LT |
1134 | } |
1135 | ||
1da177e4 LT |
1136 | /* dentry stuff */ |
1137 | ||
1138 | /* | |
1139 | * Exceptional case: normally we are not allowed to unhash a busy | |
1140 | * directory. In this case, however, we can do it - no aliasing problems | |
1141 | * due to the way we treat inodes. | |
1142 | * | |
1143 | * Rewrite the inode's ownerships here because the owning task may have | |
1144 | * performed a setuid(), etc. | |
99f89551 EB |
1145 | * |
1146 | * Before the /proc/pid/status file was created the only way to read | |
1147 | * the effective uid of a /process was to stat /proc/pid. Reading | |
1148 | * /proc/pid/status is slow enough that procps and other packages | |
1149 | * kept stating /proc/pid. To keep the rules in /proc simple I have | |
1150 | * made this apply to all per process world readable and executable | |
1151 | * directories. | |
1da177e4 LT |
1152 | */ |
1153 | static int pid_revalidate(struct dentry *dentry, struct nameidata *nd) | |
1154 | { | |
1155 | struct inode *inode = dentry->d_inode; | |
99f89551 EB |
1156 | struct task_struct *task = get_proc_task(inode); |
1157 | if (task) { | |
1158 | if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) || | |
1159 | task_dumpable(task)) { | |
1da177e4 LT |
1160 | inode->i_uid = task->euid; |
1161 | inode->i_gid = task->egid; | |
1162 | } else { | |
1163 | inode->i_uid = 0; | |
1164 | inode->i_gid = 0; | |
1165 | } | |
9ee8ab9f | 1166 | inode->i_mode &= ~(S_ISUID | S_ISGID); |
1da177e4 | 1167 | security_task_to_inode(task, inode); |
99f89551 | 1168 | put_task_struct(task); |
1da177e4 LT |
1169 | return 1; |
1170 | } | |
1171 | d_drop(dentry); | |
1172 | return 0; | |
1173 | } | |
1174 | ||
28a6d671 | 1175 | static int pid_delete_dentry(struct dentry * dentry) |
99f89551 | 1176 | { |
28a6d671 EB |
1177 | /* Is the task we represent dead? |
1178 | * If so, then don't put the dentry on the lru list, | |
1179 | * kill it immediately. | |
1180 | */ | |
1181 | return !proc_pid(dentry->d_inode)->tasks[PIDTYPE_PID].first; | |
1182 | } | |
1183 | ||
1184 | static struct dentry_operations pid_dentry_operations = | |
1185 | { | |
1186 | .d_revalidate = pid_revalidate, | |
1187 | .d_delete = pid_delete_dentry, | |
1188 | }; | |
1189 | ||
1190 | /* Lookups */ | |
1191 | ||
c5141e6d ED |
1192 | typedef struct dentry *instantiate_t(struct inode *, struct dentry *, |
1193 | struct task_struct *, const void *); | |
61a28784 | 1194 | |
1c0d04c9 EB |
1195 | /* |
1196 | * Fill a directory entry. | |
1197 | * | |
1198 | * If possible create the dcache entry and derive our inode number and | |
1199 | * file type from dcache entry. | |
1200 | * | |
1201 | * Since all of the proc inode numbers are dynamically generated, the inode | |
1202 | * numbers do not exist until the inode is cache. This means creating the | |
1203 | * the dcache entry in readdir is necessary to keep the inode numbers | |
1204 | * reported by readdir in sync with the inode numbers reported | |
1205 | * by stat. | |
1206 | */ | |
61a28784 EB |
1207 | static int proc_fill_cache(struct file *filp, void *dirent, filldir_t filldir, |
1208 | char *name, int len, | |
c5141e6d | 1209 | instantiate_t instantiate, struct task_struct *task, const void *ptr) |
61a28784 | 1210 | { |
2fddfeef | 1211 | struct dentry *child, *dir = filp->f_path.dentry; |
61a28784 EB |
1212 | struct inode *inode; |
1213 | struct qstr qname; | |
1214 | ino_t ino = 0; | |
1215 | unsigned type = DT_UNKNOWN; | |
1216 | ||
1217 | qname.name = name; | |
1218 | qname.len = len; | |
1219 | qname.hash = full_name_hash(name, len); | |
1220 | ||
1221 | child = d_lookup(dir, &qname); | |
1222 | if (!child) { | |
1223 | struct dentry *new; | |
1224 | new = d_alloc(dir, &qname); | |
1225 | if (new) { | |
1226 | child = instantiate(dir->d_inode, new, task, ptr); | |
1227 | if (child) | |
1228 | dput(new); | |
1229 | else | |
1230 | child = new; | |
1231 | } | |
1232 | } | |
1233 | if (!child || IS_ERR(child) || !child->d_inode) | |
1234 | goto end_instantiate; | |
1235 | inode = child->d_inode; | |
1236 | if (inode) { | |
1237 | ino = inode->i_ino; | |
1238 | type = inode->i_mode >> 12; | |
1239 | } | |
1240 | dput(child); | |
1241 | end_instantiate: | |
1242 | if (!ino) | |
1243 | ino = find_inode_number(dir, &qname); | |
1244 | if (!ino) | |
1245 | ino = 1; | |
1246 | return filldir(dirent, name, len, filp->f_pos, ino, type); | |
1247 | } | |
1248 | ||
28a6d671 EB |
1249 | static unsigned name_to_int(struct dentry *dentry) |
1250 | { | |
1251 | const char *name = dentry->d_name.name; | |
1252 | int len = dentry->d_name.len; | |
1253 | unsigned n = 0; | |
1254 | ||
1255 | if (len > 1 && *name == '0') | |
1256 | goto out; | |
1257 | while (len-- > 0) { | |
1258 | unsigned c = *name++ - '0'; | |
1259 | if (c > 9) | |
1260 | goto out; | |
1261 | if (n >= (~0U-9)/10) | |
1262 | goto out; | |
1263 | n *= 10; | |
1264 | n += c; | |
1265 | } | |
1266 | return n; | |
1267 | out: | |
1268 | return ~0U; | |
1269 | } | |
1270 | ||
27932742 MS |
1271 | #define PROC_FDINFO_MAX 64 |
1272 | ||
1273 | static int proc_fd_info(struct inode *inode, struct dentry **dentry, | |
1274 | struct vfsmount **mnt, char *info) | |
28a6d671 EB |
1275 | { |
1276 | struct task_struct *task = get_proc_task(inode); | |
1277 | struct files_struct *files = NULL; | |
1278 | struct file *file; | |
1279 | int fd = proc_fd(inode); | |
99f89551 | 1280 | |
99f89551 | 1281 | if (task) { |
28a6d671 EB |
1282 | files = get_files_struct(task); |
1283 | put_task_struct(task); | |
1284 | } | |
1285 | if (files) { | |
1286 | /* | |
1287 | * We are not taking a ref to the file structure, so we must | |
1288 | * hold ->file_lock. | |
1289 | */ | |
1290 | spin_lock(&files->file_lock); | |
1291 | file = fcheck_files(files, fd); | |
1292 | if (file) { | |
27932742 MS |
1293 | if (mnt) |
1294 | *mnt = mntget(file->f_path.mnt); | |
1295 | if (dentry) | |
1296 | *dentry = dget(file->f_path.dentry); | |
1297 | if (info) | |
1298 | snprintf(info, PROC_FDINFO_MAX, | |
1299 | "pos:\t%lli\n" | |
1300 | "flags:\t0%o\n", | |
1301 | (long long) file->f_pos, | |
1302 | file->f_flags); | |
28a6d671 EB |
1303 | spin_unlock(&files->file_lock); |
1304 | put_files_struct(files); | |
1305 | return 0; | |
99f89551 | 1306 | } |
28a6d671 EB |
1307 | spin_unlock(&files->file_lock); |
1308 | put_files_struct(files); | |
99f89551 | 1309 | } |
28a6d671 | 1310 | return -ENOENT; |
99f89551 EB |
1311 | } |
1312 | ||
27932742 MS |
1313 | static int proc_fd_link(struct inode *inode, struct dentry **dentry, |
1314 | struct vfsmount **mnt) | |
1315 | { | |
1316 | return proc_fd_info(inode, dentry, mnt, NULL); | |
1317 | } | |
1318 | ||
1da177e4 LT |
1319 | static int tid_fd_revalidate(struct dentry *dentry, struct nameidata *nd) |
1320 | { | |
1321 | struct inode *inode = dentry->d_inode; | |
99f89551 | 1322 | struct task_struct *task = get_proc_task(inode); |
aed7a6c4 | 1323 | int fd = proc_fd(inode); |
1da177e4 LT |
1324 | struct files_struct *files; |
1325 | ||
99f89551 EB |
1326 | if (task) { |
1327 | files = get_files_struct(task); | |
1328 | if (files) { | |
1329 | rcu_read_lock(); | |
1330 | if (fcheck_files(files, fd)) { | |
1331 | rcu_read_unlock(); | |
1332 | put_files_struct(files); | |
1333 | if (task_dumpable(task)) { | |
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); |
99f89551 EB |
1341 | security_task_to_inode(task, inode); |
1342 | put_task_struct(task); | |
1343 | return 1; | |
1344 | } | |
b835996f | 1345 | rcu_read_unlock(); |
1da177e4 | 1346 | put_files_struct(files); |
1da177e4 | 1347 | } |
99f89551 | 1348 | put_task_struct(task); |
1da177e4 LT |
1349 | } |
1350 | d_drop(dentry); | |
1351 | return 0; | |
1352 | } | |
1353 | ||
1da177e4 LT |
1354 | static struct dentry_operations tid_fd_dentry_operations = |
1355 | { | |
1356 | .d_revalidate = tid_fd_revalidate, | |
1357 | .d_delete = pid_delete_dentry, | |
1358 | }; | |
1359 | ||
444ceed8 | 1360 | static struct dentry *proc_fd_instantiate(struct inode *dir, |
c5141e6d | 1361 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
1da177e4 | 1362 | { |
c5141e6d | 1363 | unsigned fd = *(const unsigned *)ptr; |
444ceed8 EB |
1364 | struct file *file; |
1365 | struct files_struct *files; | |
1366 | struct inode *inode; | |
1367 | struct proc_inode *ei; | |
1368 | struct dentry *error = ERR_PTR(-ENOENT); | |
1da177e4 | 1369 | |
61a28784 | 1370 | inode = proc_pid_make_inode(dir->i_sb, task); |
1da177e4 LT |
1371 | if (!inode) |
1372 | goto out; | |
1373 | ei = PROC_I(inode); | |
aed7a6c4 | 1374 | ei->fd = fd; |
1da177e4 LT |
1375 | files = get_files_struct(task); |
1376 | if (!files) | |
444ceed8 | 1377 | goto out_iput; |
1da177e4 | 1378 | inode->i_mode = S_IFLNK; |
ca99c1da DS |
1379 | |
1380 | /* | |
1381 | * We are not taking a ref to the file structure, so we must | |
1382 | * hold ->file_lock. | |
1383 | */ | |
1384 | spin_lock(&files->file_lock); | |
1da177e4 LT |
1385 | file = fcheck_files(files, fd); |
1386 | if (!file) | |
444ceed8 | 1387 | goto out_unlock; |
1da177e4 LT |
1388 | if (file->f_mode & 1) |
1389 | inode->i_mode |= S_IRUSR | S_IXUSR; | |
1390 | if (file->f_mode & 2) | |
1391 | inode->i_mode |= S_IWUSR | S_IXUSR; | |
ca99c1da | 1392 | spin_unlock(&files->file_lock); |
1da177e4 | 1393 | put_files_struct(files); |
444ceed8 | 1394 | |
1da177e4 LT |
1395 | inode->i_op = &proc_pid_link_inode_operations; |
1396 | inode->i_size = 64; | |
1397 | ei->op.proc_get_link = proc_fd_link; | |
1398 | dentry->d_op = &tid_fd_dentry_operations; | |
1399 | d_add(dentry, inode); | |
cd6a3ce9 EB |
1400 | /* Close the race of the process dying before we return the dentry */ |
1401 | if (tid_fd_revalidate(dentry, NULL)) | |
444ceed8 | 1402 | error = NULL; |
1da177e4 | 1403 | |
444ceed8 EB |
1404 | out: |
1405 | return error; | |
1406 | out_unlock: | |
ca99c1da | 1407 | spin_unlock(&files->file_lock); |
1da177e4 | 1408 | put_files_struct(files); |
444ceed8 | 1409 | out_iput: |
1da177e4 | 1410 | iput(inode); |
cd6a3ce9 | 1411 | goto out; |
1da177e4 LT |
1412 | } |
1413 | ||
27932742 MS |
1414 | static struct dentry *proc_lookupfd_common(struct inode *dir, |
1415 | struct dentry *dentry, | |
1416 | instantiate_t instantiate) | |
444ceed8 EB |
1417 | { |
1418 | struct task_struct *task = get_proc_task(dir); | |
1419 | unsigned fd = name_to_int(dentry); | |
1420 | struct dentry *result = ERR_PTR(-ENOENT); | |
1421 | ||
1422 | if (!task) | |
1423 | goto out_no_task; | |
1424 | if (fd == ~0U) | |
1425 | goto out; | |
1426 | ||
27932742 | 1427 | result = instantiate(dir, dentry, task, &fd); |
444ceed8 EB |
1428 | out: |
1429 | put_task_struct(task); | |
1430 | out_no_task: | |
1431 | return result; | |
1432 | } | |
1433 | ||
27932742 MS |
1434 | static int proc_readfd_common(struct file * filp, void * dirent, |
1435 | filldir_t filldir, instantiate_t instantiate) | |
28a6d671 | 1436 | { |
2fddfeef | 1437 | struct dentry *dentry = filp->f_path.dentry; |
28a6d671 EB |
1438 | struct inode *inode = dentry->d_inode; |
1439 | struct task_struct *p = get_proc_task(inode); | |
1440 | unsigned int fd, tid, ino; | |
1441 | int retval; | |
28a6d671 EB |
1442 | struct files_struct * files; |
1443 | struct fdtable *fdt; | |
1da177e4 | 1444 | |
28a6d671 EB |
1445 | retval = -ENOENT; |
1446 | if (!p) | |
1447 | goto out_no_task; | |
1448 | retval = 0; | |
1449 | tid = p->pid; | |
1450 | ||
1451 | fd = filp->f_pos; | |
1452 | switch (fd) { | |
1453 | case 0: | |
1454 | if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0) | |
1455 | goto out; | |
1456 | filp->f_pos++; | |
1457 | case 1: | |
1458 | ino = parent_ino(dentry); | |
1459 | if (filldir(dirent, "..", 2, 1, ino, DT_DIR) < 0) | |
1460 | goto out; | |
1461 | filp->f_pos++; | |
1462 | default: | |
1463 | files = get_files_struct(p); | |
1464 | if (!files) | |
1465 | goto out; | |
1466 | rcu_read_lock(); | |
1467 | fdt = files_fdtable(files); | |
1468 | for (fd = filp->f_pos-2; | |
1469 | fd < fdt->max_fds; | |
1470 | fd++, filp->f_pos++) { | |
27932742 MS |
1471 | char name[PROC_NUMBUF]; |
1472 | int len; | |
28a6d671 EB |
1473 | |
1474 | if (!fcheck_files(files, fd)) | |
1475 | continue; | |
1476 | rcu_read_unlock(); | |
1477 | ||
27932742 MS |
1478 | len = snprintf(name, sizeof(name), "%d", fd); |
1479 | if (proc_fill_cache(filp, dirent, filldir, | |
1480 | name, len, instantiate, | |
1481 | p, &fd) < 0) { | |
28a6d671 EB |
1482 | rcu_read_lock(); |
1483 | break; | |
1484 | } | |
1485 | rcu_read_lock(); | |
1486 | } | |
1487 | rcu_read_unlock(); | |
1488 | put_files_struct(files); | |
1489 | } | |
1490 | out: | |
1491 | put_task_struct(p); | |
1492 | out_no_task: | |
1493 | return retval; | |
1494 | } | |
1495 | ||
27932742 MS |
1496 | static struct dentry *proc_lookupfd(struct inode *dir, struct dentry *dentry, |
1497 | struct nameidata *nd) | |
1498 | { | |
1499 | return proc_lookupfd_common(dir, dentry, proc_fd_instantiate); | |
1500 | } | |
1501 | ||
1502 | static int proc_readfd(struct file *filp, void *dirent, filldir_t filldir) | |
1503 | { | |
1504 | return proc_readfd_common(filp, dirent, filldir, proc_fd_instantiate); | |
1505 | } | |
1506 | ||
1507 | static ssize_t proc_fdinfo_read(struct file *file, char __user *buf, | |
1508 | size_t len, loff_t *ppos) | |
1509 | { | |
1510 | char tmp[PROC_FDINFO_MAX]; | |
1511 | int err = proc_fd_info(file->f_path.dentry->d_inode, NULL, NULL, tmp); | |
1512 | if (!err) | |
1513 | err = simple_read_from_buffer(buf, len, ppos, tmp, strlen(tmp)); | |
1514 | return err; | |
1515 | } | |
1516 | ||
1517 | static const struct file_operations proc_fdinfo_file_operations = { | |
1518 | .open = nonseekable_open, | |
1519 | .read = proc_fdinfo_read, | |
1520 | }; | |
1521 | ||
00977a59 | 1522 | static const struct file_operations proc_fd_operations = { |
28a6d671 EB |
1523 | .read = generic_read_dir, |
1524 | .readdir = proc_readfd, | |
1da177e4 LT |
1525 | }; |
1526 | ||
8948e11f AD |
1527 | /* |
1528 | * /proc/pid/fd needs a special permission handler so that a process can still | |
1529 | * access /proc/self/fd after it has executed a setuid(). | |
1530 | */ | |
1531 | static int proc_fd_permission(struct inode *inode, int mask, | |
1532 | struct nameidata *nd) | |
1533 | { | |
1534 | int rv; | |
1535 | ||
1536 | rv = generic_permission(inode, mask, NULL); | |
1537 | if (rv == 0) | |
1538 | return 0; | |
1539 | if (task_pid(current) == proc_pid(inode)) | |
1540 | rv = 0; | |
1541 | return rv; | |
1542 | } | |
1543 | ||
1da177e4 LT |
1544 | /* |
1545 | * proc directories can do almost nothing.. | |
1546 | */ | |
c5ef1c42 | 1547 | static const struct inode_operations proc_fd_inode_operations = { |
1da177e4 | 1548 | .lookup = proc_lookupfd, |
8948e11f | 1549 | .permission = proc_fd_permission, |
6d76fa58 | 1550 | .setattr = proc_setattr, |
1da177e4 LT |
1551 | }; |
1552 | ||
27932742 MS |
1553 | static struct dentry *proc_fdinfo_instantiate(struct inode *dir, |
1554 | struct dentry *dentry, struct task_struct *task, const void *ptr) | |
1555 | { | |
1556 | unsigned fd = *(unsigned *)ptr; | |
1557 | struct inode *inode; | |
1558 | struct proc_inode *ei; | |
1559 | struct dentry *error = ERR_PTR(-ENOENT); | |
1560 | ||
1561 | inode = proc_pid_make_inode(dir->i_sb, task); | |
1562 | if (!inode) | |
1563 | goto out; | |
1564 | ei = PROC_I(inode); | |
1565 | ei->fd = fd; | |
1566 | inode->i_mode = S_IFREG | S_IRUSR; | |
1567 | inode->i_fop = &proc_fdinfo_file_operations; | |
1568 | dentry->d_op = &tid_fd_dentry_operations; | |
1569 | d_add(dentry, inode); | |
1570 | /* Close the race of the process dying before we return the dentry */ | |
1571 | if (tid_fd_revalidate(dentry, NULL)) | |
1572 | error = NULL; | |
1573 | ||
1574 | out: | |
1575 | return error; | |
1576 | } | |
1577 | ||
1578 | static struct dentry *proc_lookupfdinfo(struct inode *dir, | |
1579 | struct dentry *dentry, | |
1580 | struct nameidata *nd) | |
1581 | { | |
1582 | return proc_lookupfd_common(dir, dentry, proc_fdinfo_instantiate); | |
1583 | } | |
1584 | ||
1585 | static int proc_readfdinfo(struct file *filp, void *dirent, filldir_t filldir) | |
1586 | { | |
1587 | return proc_readfd_common(filp, dirent, filldir, | |
1588 | proc_fdinfo_instantiate); | |
1589 | } | |
1590 | ||
1591 | static const struct file_operations proc_fdinfo_operations = { | |
1592 | .read = generic_read_dir, | |
1593 | .readdir = proc_readfdinfo, | |
1594 | }; | |
1595 | ||
1596 | /* | |
1597 | * proc directories can do almost nothing.. | |
1598 | */ | |
1599 | static const struct inode_operations proc_fdinfo_inode_operations = { | |
1600 | .lookup = proc_lookupfdinfo, | |
1601 | .setattr = proc_setattr, | |
1602 | }; | |
1603 | ||
1604 | ||
444ceed8 | 1605 | static struct dentry *proc_pident_instantiate(struct inode *dir, |
c5141e6d | 1606 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
444ceed8 | 1607 | { |
c5141e6d | 1608 | const struct pid_entry *p = ptr; |
444ceed8 EB |
1609 | struct inode *inode; |
1610 | struct proc_inode *ei; | |
1611 | struct dentry *error = ERR_PTR(-EINVAL); | |
1612 | ||
61a28784 | 1613 | inode = proc_pid_make_inode(dir->i_sb, task); |
444ceed8 EB |
1614 | if (!inode) |
1615 | goto out; | |
1616 | ||
1617 | ei = PROC_I(inode); | |
1618 | inode->i_mode = p->mode; | |
1619 | if (S_ISDIR(inode->i_mode)) | |
1620 | inode->i_nlink = 2; /* Use getattr to fix if necessary */ | |
1621 | if (p->iop) | |
1622 | inode->i_op = p->iop; | |
1623 | if (p->fop) | |
1624 | inode->i_fop = p->fop; | |
1625 | ei->op = p->op; | |
1626 | dentry->d_op = &pid_dentry_operations; | |
1627 | d_add(dentry, inode); | |
1628 | /* Close the race of the process dying before we return the dentry */ | |
1629 | if (pid_revalidate(dentry, NULL)) | |
1630 | error = NULL; | |
1631 | out: | |
1632 | return error; | |
1633 | } | |
1634 | ||
1da177e4 LT |
1635 | static struct dentry *proc_pident_lookup(struct inode *dir, |
1636 | struct dentry *dentry, | |
c5141e6d | 1637 | const struct pid_entry *ents, |
7bcd6b0e | 1638 | unsigned int nents) |
1da177e4 LT |
1639 | { |
1640 | struct inode *inode; | |
cd6a3ce9 | 1641 | struct dentry *error; |
99f89551 | 1642 | struct task_struct *task = get_proc_task(dir); |
c5141e6d | 1643 | const struct pid_entry *p, *last; |
1da177e4 | 1644 | |
cd6a3ce9 | 1645 | error = ERR_PTR(-ENOENT); |
1da177e4 LT |
1646 | inode = NULL; |
1647 | ||
99f89551 EB |
1648 | if (!task) |
1649 | goto out_no_task; | |
1da177e4 | 1650 | |
20cdc894 EB |
1651 | /* |
1652 | * Yes, it does not scale. And it should not. Don't add | |
1653 | * new entries into /proc/<tgid>/ without very good reasons. | |
1654 | */ | |
7bcd6b0e EB |
1655 | last = &ents[nents - 1]; |
1656 | for (p = ents; p <= last; p++) { | |
1da177e4 LT |
1657 | if (p->len != dentry->d_name.len) |
1658 | continue; | |
1659 | if (!memcmp(dentry->d_name.name, p->name, p->len)) | |
1660 | break; | |
1661 | } | |
7bcd6b0e | 1662 | if (p > last) |
1da177e4 LT |
1663 | goto out; |
1664 | ||
444ceed8 | 1665 | error = proc_pident_instantiate(dir, dentry, task, p); |
1da177e4 | 1666 | out: |
99f89551 EB |
1667 | put_task_struct(task); |
1668 | out_no_task: | |
cd6a3ce9 | 1669 | return error; |
1da177e4 LT |
1670 | } |
1671 | ||
c5141e6d ED |
1672 | static int proc_pident_fill_cache(struct file *filp, void *dirent, |
1673 | filldir_t filldir, struct task_struct *task, const struct pid_entry *p) | |
61a28784 EB |
1674 | { |
1675 | return proc_fill_cache(filp, dirent, filldir, p->name, p->len, | |
1676 | proc_pident_instantiate, task, p); | |
1677 | } | |
1678 | ||
28a6d671 EB |
1679 | static int proc_pident_readdir(struct file *filp, |
1680 | void *dirent, filldir_t filldir, | |
c5141e6d | 1681 | const struct pid_entry *ents, unsigned int nents) |
28a6d671 EB |
1682 | { |
1683 | int i; | |
1684 | int pid; | |
2fddfeef | 1685 | struct dentry *dentry = filp->f_path.dentry; |
28a6d671 EB |
1686 | struct inode *inode = dentry->d_inode; |
1687 | struct task_struct *task = get_proc_task(inode); | |
c5141e6d | 1688 | const struct pid_entry *p, *last; |
28a6d671 EB |
1689 | ino_t ino; |
1690 | int ret; | |
1691 | ||
1692 | ret = -ENOENT; | |
1693 | if (!task) | |
61a28784 | 1694 | goto out_no_task; |
28a6d671 EB |
1695 | |
1696 | ret = 0; | |
1697 | pid = task->pid; | |
28a6d671 EB |
1698 | i = filp->f_pos; |
1699 | switch (i) { | |
1700 | case 0: | |
1701 | ino = inode->i_ino; | |
1702 | if (filldir(dirent, ".", 1, i, ino, DT_DIR) < 0) | |
1703 | goto out; | |
1704 | i++; | |
1705 | filp->f_pos++; | |
1706 | /* fall through */ | |
1707 | case 1: | |
1708 | ino = parent_ino(dentry); | |
1709 | if (filldir(dirent, "..", 2, i, ino, DT_DIR) < 0) | |
1710 | goto out; | |
1711 | i++; | |
1712 | filp->f_pos++; | |
1713 | /* fall through */ | |
1714 | default: | |
1715 | i -= 2; | |
1716 | if (i >= nents) { | |
1717 | ret = 1; | |
1718 | goto out; | |
1719 | } | |
1720 | p = ents + i; | |
7bcd6b0e EB |
1721 | last = &ents[nents - 1]; |
1722 | while (p <= last) { | |
61a28784 | 1723 | if (proc_pident_fill_cache(filp, dirent, filldir, task, p) < 0) |
28a6d671 EB |
1724 | goto out; |
1725 | filp->f_pos++; | |
1726 | p++; | |
1727 | } | |
1728 | } | |
1729 | ||
1730 | ret = 1; | |
1731 | out: | |
61a28784 EB |
1732 | put_task_struct(task); |
1733 | out_no_task: | |
28a6d671 | 1734 | return ret; |
1da177e4 LT |
1735 | } |
1736 | ||
28a6d671 EB |
1737 | #ifdef CONFIG_SECURITY |
1738 | static ssize_t proc_pid_attr_read(struct file * file, char __user * buf, | |
1739 | size_t count, loff_t *ppos) | |
1740 | { | |
2fddfeef | 1741 | struct inode * inode = file->f_path.dentry->d_inode; |
04ff9708 | 1742 | char *p = NULL; |
28a6d671 EB |
1743 | ssize_t length; |
1744 | struct task_struct *task = get_proc_task(inode); | |
1745 | ||
28a6d671 | 1746 | if (!task) |
04ff9708 | 1747 | return -ESRCH; |
28a6d671 EB |
1748 | |
1749 | length = security_getprocattr(task, | |
2fddfeef | 1750 | (char*)file->f_path.dentry->d_name.name, |
04ff9708 | 1751 | &p); |
28a6d671 | 1752 | put_task_struct(task); |
04ff9708 AV |
1753 | if (length > 0) |
1754 | length = simple_read_from_buffer(buf, count, ppos, p, length); | |
1755 | kfree(p); | |
28a6d671 | 1756 | return length; |
1da177e4 LT |
1757 | } |
1758 | ||
28a6d671 EB |
1759 | static ssize_t proc_pid_attr_write(struct file * file, const char __user * buf, |
1760 | size_t count, loff_t *ppos) | |
1761 | { | |
2fddfeef | 1762 | struct inode * inode = file->f_path.dentry->d_inode; |
28a6d671 EB |
1763 | char *page; |
1764 | ssize_t length; | |
1765 | struct task_struct *task = get_proc_task(inode); | |
1766 | ||
1767 | length = -ESRCH; | |
1768 | if (!task) | |
1769 | goto out_no_task; | |
1770 | if (count > PAGE_SIZE) | |
1771 | count = PAGE_SIZE; | |
1772 | ||
1773 | /* No partial writes. */ | |
1774 | length = -EINVAL; | |
1775 | if (*ppos != 0) | |
1776 | goto out; | |
1777 | ||
1778 | length = -ENOMEM; | |
e12ba74d | 1779 | page = (char*)__get_free_page(GFP_TEMPORARY); |
28a6d671 EB |
1780 | if (!page) |
1781 | goto out; | |
1782 | ||
1783 | length = -EFAULT; | |
1784 | if (copy_from_user(page, buf, count)) | |
1785 | goto out_free; | |
1786 | ||
1787 | length = security_setprocattr(task, | |
2fddfeef | 1788 | (char*)file->f_path.dentry->d_name.name, |
28a6d671 EB |
1789 | (void*)page, count); |
1790 | out_free: | |
1791 | free_page((unsigned long) page); | |
1792 | out: | |
1793 | put_task_struct(task); | |
1794 | out_no_task: | |
1795 | return length; | |
1796 | } | |
1797 | ||
00977a59 | 1798 | static const struct file_operations proc_pid_attr_operations = { |
28a6d671 EB |
1799 | .read = proc_pid_attr_read, |
1800 | .write = proc_pid_attr_write, | |
1801 | }; | |
1802 | ||
c5141e6d | 1803 | static const struct pid_entry attr_dir_stuff[] = { |
61a28784 EB |
1804 | REG("current", S_IRUGO|S_IWUGO, pid_attr), |
1805 | REG("prev", S_IRUGO, pid_attr), | |
1806 | REG("exec", S_IRUGO|S_IWUGO, pid_attr), | |
1807 | REG("fscreate", S_IRUGO|S_IWUGO, pid_attr), | |
1808 | REG("keycreate", S_IRUGO|S_IWUGO, pid_attr), | |
1809 | REG("sockcreate", S_IRUGO|S_IWUGO, pid_attr), | |
28a6d671 EB |
1810 | }; |
1811 | ||
72d9dcfc | 1812 | static int proc_attr_dir_readdir(struct file * filp, |
28a6d671 EB |
1813 | void * dirent, filldir_t filldir) |
1814 | { | |
1815 | return proc_pident_readdir(filp,dirent,filldir, | |
72d9dcfc | 1816 | attr_dir_stuff,ARRAY_SIZE(attr_dir_stuff)); |
28a6d671 EB |
1817 | } |
1818 | ||
00977a59 | 1819 | static const struct file_operations proc_attr_dir_operations = { |
1da177e4 | 1820 | .read = generic_read_dir, |
72d9dcfc | 1821 | .readdir = proc_attr_dir_readdir, |
1da177e4 LT |
1822 | }; |
1823 | ||
72d9dcfc | 1824 | static struct dentry *proc_attr_dir_lookup(struct inode *dir, |
28a6d671 EB |
1825 | struct dentry *dentry, struct nameidata *nd) |
1826 | { | |
7bcd6b0e EB |
1827 | return proc_pident_lookup(dir, dentry, |
1828 | attr_dir_stuff, ARRAY_SIZE(attr_dir_stuff)); | |
28a6d671 EB |
1829 | } |
1830 | ||
c5ef1c42 | 1831 | static const struct inode_operations proc_attr_dir_inode_operations = { |
72d9dcfc | 1832 | .lookup = proc_attr_dir_lookup, |
99f89551 | 1833 | .getattr = pid_getattr, |
6d76fa58 | 1834 | .setattr = proc_setattr, |
1da177e4 LT |
1835 | }; |
1836 | ||
28a6d671 EB |
1837 | #endif |
1838 | ||
3cb4a0bb KH |
1839 | #if defined(USE_ELF_CORE_DUMP) && defined(CONFIG_ELF_CORE) |
1840 | static ssize_t proc_coredump_filter_read(struct file *file, char __user *buf, | |
1841 | size_t count, loff_t *ppos) | |
1842 | { | |
1843 | struct task_struct *task = get_proc_task(file->f_dentry->d_inode); | |
1844 | struct mm_struct *mm; | |
1845 | char buffer[PROC_NUMBUF]; | |
1846 | size_t len; | |
1847 | int ret; | |
1848 | ||
1849 | if (!task) | |
1850 | return -ESRCH; | |
1851 | ||
1852 | ret = 0; | |
1853 | mm = get_task_mm(task); | |
1854 | if (mm) { | |
1855 | len = snprintf(buffer, sizeof(buffer), "%08lx\n", | |
1856 | ((mm->flags & MMF_DUMP_FILTER_MASK) >> | |
1857 | MMF_DUMP_FILTER_SHIFT)); | |
1858 | mmput(mm); | |
1859 | ret = simple_read_from_buffer(buf, count, ppos, buffer, len); | |
1860 | } | |
1861 | ||
1862 | put_task_struct(task); | |
1863 | ||
1864 | return ret; | |
1865 | } | |
1866 | ||
1867 | static ssize_t proc_coredump_filter_write(struct file *file, | |
1868 | const char __user *buf, | |
1869 | size_t count, | |
1870 | loff_t *ppos) | |
1871 | { | |
1872 | struct task_struct *task; | |
1873 | struct mm_struct *mm; | |
1874 | char buffer[PROC_NUMBUF], *end; | |
1875 | unsigned int val; | |
1876 | int ret; | |
1877 | int i; | |
1878 | unsigned long mask; | |
1879 | ||
1880 | ret = -EFAULT; | |
1881 | memset(buffer, 0, sizeof(buffer)); | |
1882 | if (count > sizeof(buffer) - 1) | |
1883 | count = sizeof(buffer) - 1; | |
1884 | if (copy_from_user(buffer, buf, count)) | |
1885 | goto out_no_task; | |
1886 | ||
1887 | ret = -EINVAL; | |
1888 | val = (unsigned int)simple_strtoul(buffer, &end, 0); | |
1889 | if (*end == '\n') | |
1890 | end++; | |
1891 | if (end - buffer == 0) | |
1892 | goto out_no_task; | |
1893 | ||
1894 | ret = -ESRCH; | |
1895 | task = get_proc_task(file->f_dentry->d_inode); | |
1896 | if (!task) | |
1897 | goto out_no_task; | |
1898 | ||
1899 | ret = end - buffer; | |
1900 | mm = get_task_mm(task); | |
1901 | if (!mm) | |
1902 | goto out_no_mm; | |
1903 | ||
1904 | for (i = 0, mask = 1; i < MMF_DUMP_FILTER_BITS; i++, mask <<= 1) { | |
1905 | if (val & mask) | |
1906 | set_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags); | |
1907 | else | |
1908 | clear_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags); | |
1909 | } | |
1910 | ||
1911 | mmput(mm); | |
1912 | out_no_mm: | |
1913 | put_task_struct(task); | |
1914 | out_no_task: | |
1915 | return ret; | |
1916 | } | |
1917 | ||
1918 | static const struct file_operations proc_coredump_filter_operations = { | |
1919 | .read = proc_coredump_filter_read, | |
1920 | .write = proc_coredump_filter_write, | |
1921 | }; | |
1922 | #endif | |
1923 | ||
28a6d671 EB |
1924 | /* |
1925 | * /proc/self: | |
1926 | */ | |
1927 | static int proc_self_readlink(struct dentry *dentry, char __user *buffer, | |
1928 | int buflen) | |
1929 | { | |
1930 | char tmp[PROC_NUMBUF]; | |
1931 | sprintf(tmp, "%d", current->tgid); | |
1932 | return vfs_readlink(dentry,buffer,buflen,tmp); | |
1933 | } | |
1934 | ||
1935 | static void *proc_self_follow_link(struct dentry *dentry, struct nameidata *nd) | |
1936 | { | |
1937 | char tmp[PROC_NUMBUF]; | |
1938 | sprintf(tmp, "%d", current->tgid); | |
1939 | return ERR_PTR(vfs_follow_link(nd,tmp)); | |
1940 | } | |
1941 | ||
c5ef1c42 | 1942 | static const struct inode_operations proc_self_inode_operations = { |
28a6d671 EB |
1943 | .readlink = proc_self_readlink, |
1944 | .follow_link = proc_self_follow_link, | |
1945 | }; | |
1946 | ||
801199ce EB |
1947 | /* |
1948 | * proc base | |
1949 | * | |
1950 | * These are the directory entries in the root directory of /proc | |
1951 | * that properly belong to the /proc filesystem, as they describe | |
1952 | * describe something that is process related. | |
1953 | */ | |
c5141e6d | 1954 | static const struct pid_entry proc_base_stuff[] = { |
61a28784 | 1955 | NOD("self", S_IFLNK|S_IRWXUGO, |
801199ce | 1956 | &proc_self_inode_operations, NULL, {}), |
801199ce EB |
1957 | }; |
1958 | ||
1959 | /* | |
1960 | * Exceptional case: normally we are not allowed to unhash a busy | |
1961 | * directory. In this case, however, we can do it - no aliasing problems | |
1962 | * due to the way we treat inodes. | |
1963 | */ | |
1964 | static int proc_base_revalidate(struct dentry *dentry, struct nameidata *nd) | |
1965 | { | |
1966 | struct inode *inode = dentry->d_inode; | |
1967 | struct task_struct *task = get_proc_task(inode); | |
1968 | if (task) { | |
1969 | put_task_struct(task); | |
1970 | return 1; | |
1971 | } | |
1972 | d_drop(dentry); | |
1973 | return 0; | |
1974 | } | |
1975 | ||
1976 | static struct dentry_operations proc_base_dentry_operations = | |
1977 | { | |
1978 | .d_revalidate = proc_base_revalidate, | |
1979 | .d_delete = pid_delete_dentry, | |
1980 | }; | |
1981 | ||
444ceed8 | 1982 | static struct dentry *proc_base_instantiate(struct inode *dir, |
c5141e6d | 1983 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
801199ce | 1984 | { |
c5141e6d | 1985 | const struct pid_entry *p = ptr; |
801199ce | 1986 | struct inode *inode; |
801199ce | 1987 | struct proc_inode *ei; |
444ceed8 | 1988 | struct dentry *error = ERR_PTR(-EINVAL); |
801199ce EB |
1989 | |
1990 | /* Allocate the inode */ | |
1991 | error = ERR_PTR(-ENOMEM); | |
1992 | inode = new_inode(dir->i_sb); | |
1993 | if (!inode) | |
1994 | goto out; | |
1995 | ||
1996 | /* Initialize the inode */ | |
1997 | ei = PROC_I(inode); | |
1998 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; | |
801199ce EB |
1999 | |
2000 | /* | |
2001 | * grab the reference to the task. | |
2002 | */ | |
1a657f78 | 2003 | ei->pid = get_task_pid(task, PIDTYPE_PID); |
801199ce EB |
2004 | if (!ei->pid) |
2005 | goto out_iput; | |
2006 | ||
2007 | inode->i_uid = 0; | |
2008 | inode->i_gid = 0; | |
2009 | inode->i_mode = p->mode; | |
2010 | if (S_ISDIR(inode->i_mode)) | |
2011 | inode->i_nlink = 2; | |
2012 | if (S_ISLNK(inode->i_mode)) | |
2013 | inode->i_size = 64; | |
2014 | if (p->iop) | |
2015 | inode->i_op = p->iop; | |
2016 | if (p->fop) | |
2017 | inode->i_fop = p->fop; | |
2018 | ei->op = p->op; | |
2019 | dentry->d_op = &proc_base_dentry_operations; | |
2020 | d_add(dentry, inode); | |
2021 | error = NULL; | |
2022 | out: | |
801199ce EB |
2023 | return error; |
2024 | out_iput: | |
2025 | iput(inode); | |
2026 | goto out; | |
2027 | } | |
2028 | ||
444ceed8 EB |
2029 | static struct dentry *proc_base_lookup(struct inode *dir, struct dentry *dentry) |
2030 | { | |
2031 | struct dentry *error; | |
2032 | struct task_struct *task = get_proc_task(dir); | |
c5141e6d | 2033 | const struct pid_entry *p, *last; |
444ceed8 EB |
2034 | |
2035 | error = ERR_PTR(-ENOENT); | |
2036 | ||
2037 | if (!task) | |
2038 | goto out_no_task; | |
2039 | ||
2040 | /* Lookup the directory entry */ | |
7bcd6b0e EB |
2041 | last = &proc_base_stuff[ARRAY_SIZE(proc_base_stuff) - 1]; |
2042 | for (p = proc_base_stuff; p <= last; p++) { | |
444ceed8 EB |
2043 | if (p->len != dentry->d_name.len) |
2044 | continue; | |
2045 | if (!memcmp(dentry->d_name.name, p->name, p->len)) | |
2046 | break; | |
2047 | } | |
7bcd6b0e | 2048 | if (p > last) |
444ceed8 EB |
2049 | goto out; |
2050 | ||
2051 | error = proc_base_instantiate(dir, dentry, task, p); | |
2052 | ||
2053 | out: | |
2054 | put_task_struct(task); | |
2055 | out_no_task: | |
2056 | return error; | |
2057 | } | |
2058 | ||
c5141e6d ED |
2059 | static int proc_base_fill_cache(struct file *filp, void *dirent, |
2060 | filldir_t filldir, struct task_struct *task, const struct pid_entry *p) | |
61a28784 EB |
2061 | { |
2062 | return proc_fill_cache(filp, dirent, filldir, p->name, p->len, | |
2063 | proc_base_instantiate, task, p); | |
2064 | } | |
2065 | ||
aba76fdb AM |
2066 | #ifdef CONFIG_TASK_IO_ACCOUNTING |
2067 | static int proc_pid_io_accounting(struct task_struct *task, char *buffer) | |
2068 | { | |
2069 | return sprintf(buffer, | |
4b98d11b | 2070 | #ifdef CONFIG_TASK_XACCT |
aba76fdb AM |
2071 | "rchar: %llu\n" |
2072 | "wchar: %llu\n" | |
2073 | "syscr: %llu\n" | |
2074 | "syscw: %llu\n" | |
4b98d11b | 2075 | #endif |
aba76fdb AM |
2076 | "read_bytes: %llu\n" |
2077 | "write_bytes: %llu\n" | |
2078 | "cancelled_write_bytes: %llu\n", | |
4b98d11b | 2079 | #ifdef CONFIG_TASK_XACCT |
aba76fdb AM |
2080 | (unsigned long long)task->rchar, |
2081 | (unsigned long long)task->wchar, | |
2082 | (unsigned long long)task->syscr, | |
2083 | (unsigned long long)task->syscw, | |
4b98d11b | 2084 | #endif |
aba76fdb AM |
2085 | (unsigned long long)task->ioac.read_bytes, |
2086 | (unsigned long long)task->ioac.write_bytes, | |
2087 | (unsigned long long)task->ioac.cancelled_write_bytes); | |
2088 | } | |
2089 | #endif | |
2090 | ||
28a6d671 EB |
2091 | /* |
2092 | * Thread groups | |
2093 | */ | |
00977a59 | 2094 | static const struct file_operations proc_task_operations; |
c5ef1c42 | 2095 | static const struct inode_operations proc_task_inode_operations; |
20cdc894 | 2096 | |
c5141e6d | 2097 | static const struct pid_entry tgid_base_stuff[] = { |
61a28784 EB |
2098 | DIR("task", S_IRUGO|S_IXUGO, task), |
2099 | DIR("fd", S_IRUSR|S_IXUSR, fd), | |
27932742 | 2100 | DIR("fdinfo", S_IRUSR|S_IXUSR, fdinfo), |
315e28c8 | 2101 | REG("environ", S_IRUSR, environ), |
61a28784 EB |
2102 | INF("auxv", S_IRUSR, pid_auxv), |
2103 | INF("status", S_IRUGO, pid_status), | |
43ae34cb IM |
2104 | #ifdef CONFIG_SCHED_DEBUG |
2105 | REG("sched", S_IRUGO|S_IWUSR, pid_sched), | |
2106 | #endif | |
61a28784 EB |
2107 | INF("cmdline", S_IRUGO, pid_cmdline), |
2108 | INF("stat", S_IRUGO, tgid_stat), | |
2109 | INF("statm", S_IRUGO, pid_statm), | |
2110 | REG("maps", S_IRUGO, maps), | |
28a6d671 | 2111 | #ifdef CONFIG_NUMA |
61a28784 | 2112 | REG("numa_maps", S_IRUGO, numa_maps), |
28a6d671 | 2113 | #endif |
61a28784 | 2114 | REG("mem", S_IRUSR|S_IWUSR, mem), |
61a28784 EB |
2115 | LNK("cwd", cwd), |
2116 | LNK("root", root), | |
2117 | LNK("exe", exe), | |
2118 | REG("mounts", S_IRUGO, mounts), | |
2119 | REG("mountstats", S_IRUSR, mountstats), | |
28a6d671 | 2120 | #ifdef CONFIG_MMU |
b813e931 | 2121 | REG("clear_refs", S_IWUSR, clear_refs), |
61a28784 | 2122 | REG("smaps", S_IRUGO, smaps), |
28a6d671 EB |
2123 | #endif |
2124 | #ifdef CONFIG_SECURITY | |
72d9dcfc | 2125 | DIR("attr", S_IRUGO|S_IXUGO, attr_dir), |
28a6d671 EB |
2126 | #endif |
2127 | #ifdef CONFIG_KALLSYMS | |
61a28784 | 2128 | INF("wchan", S_IRUGO, pid_wchan), |
28a6d671 EB |
2129 | #endif |
2130 | #ifdef CONFIG_SCHEDSTATS | |
61a28784 | 2131 | INF("schedstat", S_IRUGO, pid_schedstat), |
28a6d671 EB |
2132 | #endif |
2133 | #ifdef CONFIG_CPUSETS | |
61a28784 | 2134 | REG("cpuset", S_IRUGO, cpuset), |
28a6d671 | 2135 | #endif |
61a28784 EB |
2136 | INF("oom_score", S_IRUGO, oom_score), |
2137 | REG("oom_adj", S_IRUGO|S_IWUSR, oom_adjust), | |
28a6d671 | 2138 | #ifdef CONFIG_AUDITSYSCALL |
61a28784 | 2139 | REG("loginuid", S_IWUSR|S_IRUGO, loginuid), |
28a6d671 | 2140 | #endif |
f4f154fd AM |
2141 | #ifdef CONFIG_FAULT_INJECTION |
2142 | REG("make-it-fail", S_IRUGO|S_IWUSR, fault_inject), | |
2143 | #endif | |
3cb4a0bb KH |
2144 | #if defined(USE_ELF_CORE_DUMP) && defined(CONFIG_ELF_CORE) |
2145 | REG("coredump_filter", S_IRUGO|S_IWUSR, coredump_filter), | |
2146 | #endif | |
aba76fdb AM |
2147 | #ifdef CONFIG_TASK_IO_ACCOUNTING |
2148 | INF("io", S_IRUGO, pid_io_accounting), | |
2149 | #endif | |
28a6d671 | 2150 | }; |
1da177e4 | 2151 | |
28a6d671 | 2152 | static int proc_tgid_base_readdir(struct file * filp, |
1da177e4 LT |
2153 | void * dirent, filldir_t filldir) |
2154 | { | |
2155 | return proc_pident_readdir(filp,dirent,filldir, | |
28a6d671 | 2156 | tgid_base_stuff,ARRAY_SIZE(tgid_base_stuff)); |
1da177e4 LT |
2157 | } |
2158 | ||
00977a59 | 2159 | static const struct file_operations proc_tgid_base_operations = { |
1da177e4 | 2160 | .read = generic_read_dir, |
28a6d671 | 2161 | .readdir = proc_tgid_base_readdir, |
1da177e4 LT |
2162 | }; |
2163 | ||
28a6d671 | 2164 | static struct dentry *proc_tgid_base_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd){ |
7bcd6b0e EB |
2165 | return proc_pident_lookup(dir, dentry, |
2166 | tgid_base_stuff, ARRAY_SIZE(tgid_base_stuff)); | |
1da177e4 LT |
2167 | } |
2168 | ||
c5ef1c42 | 2169 | static const struct inode_operations proc_tgid_base_inode_operations = { |
28a6d671 | 2170 | .lookup = proc_tgid_base_lookup, |
99f89551 | 2171 | .getattr = pid_getattr, |
6d76fa58 | 2172 | .setattr = proc_setattr, |
1da177e4 | 2173 | }; |
1da177e4 LT |
2174 | |
2175 | /** | |
48e6484d EB |
2176 | * proc_flush_task - Remove dcache entries for @task from the /proc dcache. |
2177 | * | |
2178 | * @task: task that should be flushed. | |
2179 | * | |
2180 | * Looks in the dcache for | |
2181 | * /proc/@pid | |
2182 | * /proc/@tgid/task/@pid | |
2183 | * if either directory is present flushes it and all of it'ts children | |
2184 | * from the dcache. | |
1da177e4 | 2185 | * |
48e6484d EB |
2186 | * It is safe and reasonable to cache /proc entries for a task until |
2187 | * that task exits. After that they just clog up the dcache with | |
2188 | * useless entries, possibly causing useful dcache entries to be | |
2189 | * flushed instead. This routine is proved to flush those useless | |
2190 | * dcache entries at process exit time. | |
1da177e4 | 2191 | * |
48e6484d EB |
2192 | * NOTE: This routine is just an optimization so it does not guarantee |
2193 | * that no dcache entries will exist at process exit time it | |
2194 | * just makes it very unlikely that any will persist. | |
1da177e4 | 2195 | */ |
48e6484d | 2196 | void proc_flush_task(struct task_struct *task) |
1da177e4 | 2197 | { |
48e6484d | 2198 | struct dentry *dentry, *leader, *dir; |
8578cea7 | 2199 | char buf[PROC_NUMBUF]; |
48e6484d EB |
2200 | struct qstr name; |
2201 | ||
2202 | name.name = buf; | |
2203 | name.len = snprintf(buf, sizeof(buf), "%d", task->pid); | |
2204 | dentry = d_hash_and_lookup(proc_mnt->mnt_root, &name); | |
2205 | if (dentry) { | |
2206 | shrink_dcache_parent(dentry); | |
2207 | d_drop(dentry); | |
2208 | dput(dentry); | |
2209 | } | |
1da177e4 | 2210 | |
48e6484d EB |
2211 | if (thread_group_leader(task)) |
2212 | goto out; | |
1da177e4 | 2213 | |
48e6484d EB |
2214 | name.name = buf; |
2215 | name.len = snprintf(buf, sizeof(buf), "%d", task->tgid); | |
2216 | leader = d_hash_and_lookup(proc_mnt->mnt_root, &name); | |
2217 | if (!leader) | |
2218 | goto out; | |
1da177e4 | 2219 | |
48e6484d EB |
2220 | name.name = "task"; |
2221 | name.len = strlen(name.name); | |
2222 | dir = d_hash_and_lookup(leader, &name); | |
2223 | if (!dir) | |
2224 | goto out_put_leader; | |
2225 | ||
2226 | name.name = buf; | |
2227 | name.len = snprintf(buf, sizeof(buf), "%d", task->pid); | |
2228 | dentry = d_hash_and_lookup(dir, &name); | |
2229 | if (dentry) { | |
2230 | shrink_dcache_parent(dentry); | |
2231 | d_drop(dentry); | |
2232 | dput(dentry); | |
1da177e4 | 2233 | } |
48e6484d EB |
2234 | |
2235 | dput(dir); | |
2236 | out_put_leader: | |
2237 | dput(leader); | |
2238 | out: | |
2239 | return; | |
1da177e4 LT |
2240 | } |
2241 | ||
9711ef99 AB |
2242 | static struct dentry *proc_pid_instantiate(struct inode *dir, |
2243 | struct dentry * dentry, | |
c5141e6d | 2244 | struct task_struct *task, const void *ptr) |
444ceed8 EB |
2245 | { |
2246 | struct dentry *error = ERR_PTR(-ENOENT); | |
2247 | struct inode *inode; | |
2248 | ||
61a28784 | 2249 | inode = proc_pid_make_inode(dir->i_sb, task); |
444ceed8 EB |
2250 | if (!inode) |
2251 | goto out; | |
2252 | ||
2253 | inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO; | |
2254 | inode->i_op = &proc_tgid_base_inode_operations; | |
2255 | inode->i_fop = &proc_tgid_base_operations; | |
2256 | inode->i_flags|=S_IMMUTABLE; | |
27932742 | 2257 | inode->i_nlink = 5; |
444ceed8 EB |
2258 | #ifdef CONFIG_SECURITY |
2259 | inode->i_nlink += 1; | |
2260 | #endif | |
2261 | ||
2262 | dentry->d_op = &pid_dentry_operations; | |
2263 | ||
2264 | d_add(dentry, inode); | |
2265 | /* Close the race of the process dying before we return the dentry */ | |
2266 | if (pid_revalidate(dentry, NULL)) | |
2267 | error = NULL; | |
2268 | out: | |
2269 | return error; | |
2270 | } | |
2271 | ||
1da177e4 LT |
2272 | struct dentry *proc_pid_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd) |
2273 | { | |
cd6a3ce9 | 2274 | struct dentry *result = ERR_PTR(-ENOENT); |
1da177e4 | 2275 | struct task_struct *task; |
1da177e4 | 2276 | unsigned tgid; |
1da177e4 | 2277 | |
801199ce EB |
2278 | result = proc_base_lookup(dir, dentry); |
2279 | if (!IS_ERR(result) || PTR_ERR(result) != -ENOENT) | |
2280 | goto out; | |
2281 | ||
1da177e4 LT |
2282 | tgid = name_to_int(dentry); |
2283 | if (tgid == ~0U) | |
2284 | goto out; | |
2285 | ||
de758734 | 2286 | rcu_read_lock(); |
1da177e4 LT |
2287 | task = find_task_by_pid(tgid); |
2288 | if (task) | |
2289 | get_task_struct(task); | |
de758734 | 2290 | rcu_read_unlock(); |
1da177e4 LT |
2291 | if (!task) |
2292 | goto out; | |
2293 | ||
444ceed8 | 2294 | result = proc_pid_instantiate(dir, dentry, task, NULL); |
1da177e4 | 2295 | put_task_struct(task); |
1da177e4 | 2296 | out: |
cd6a3ce9 | 2297 | return result; |
1da177e4 LT |
2298 | } |
2299 | ||
1da177e4 | 2300 | /* |
0804ef4b | 2301 | * Find the first task with tgid >= tgid |
0bc58a91 | 2302 | * |
1da177e4 | 2303 | */ |
0804ef4b | 2304 | static struct task_struct *next_tgid(unsigned int tgid) |
1da177e4 | 2305 | { |
0804ef4b EB |
2306 | struct task_struct *task; |
2307 | struct pid *pid; | |
1da177e4 | 2308 | |
454cc105 | 2309 | rcu_read_lock(); |
0804ef4b EB |
2310 | retry: |
2311 | task = NULL; | |
2312 | pid = find_ge_pid(tgid); | |
2313 | if (pid) { | |
2314 | tgid = pid->nr + 1; | |
2315 | task = pid_task(pid, PIDTYPE_PID); | |
2316 | /* What we to know is if the pid we have find is the | |
2317 | * pid of a thread_group_leader. Testing for task | |
2318 | * being a thread_group_leader is the obvious thing | |
2319 | * todo but there is a window when it fails, due to | |
2320 | * the pid transfer logic in de_thread. | |
2321 | * | |
2322 | * So we perform the straight forward test of seeing | |
2323 | * if the pid we have found is the pid of a thread | |
2324 | * group leader, and don't worry if the task we have | |
2325 | * found doesn't happen to be a thread group leader. | |
2326 | * As we don't care in the case of readdir. | |
2327 | */ | |
2328 | if (!task || !has_group_leader_pid(task)) | |
2329 | goto retry; | |
2330 | get_task_struct(task); | |
0bc58a91 | 2331 | } |
454cc105 | 2332 | rcu_read_unlock(); |
0804ef4b | 2333 | return task; |
1da177e4 LT |
2334 | } |
2335 | ||
7bcd6b0e | 2336 | #define TGID_OFFSET (FIRST_PROCESS_ENTRY + ARRAY_SIZE(proc_base_stuff)) |
0804ef4b | 2337 | |
61a28784 EB |
2338 | static int proc_pid_fill_cache(struct file *filp, void *dirent, filldir_t filldir, |
2339 | struct task_struct *task, int tgid) | |
2340 | { | |
2341 | char name[PROC_NUMBUF]; | |
2342 | int len = snprintf(name, sizeof(name), "%d", tgid); | |
2343 | return proc_fill_cache(filp, dirent, filldir, name, len, | |
2344 | proc_pid_instantiate, task, NULL); | |
2345 | } | |
2346 | ||
1da177e4 LT |
2347 | /* for the /proc/ directory itself, after non-process stuff has been done */ |
2348 | int proc_pid_readdir(struct file * filp, void * dirent, filldir_t filldir) | |
2349 | { | |
1da177e4 | 2350 | unsigned int nr = filp->f_pos - FIRST_PROCESS_ENTRY; |
2fddfeef | 2351 | struct task_struct *reaper = get_proc_task(filp->f_path.dentry->d_inode); |
0bc58a91 EB |
2352 | struct task_struct *task; |
2353 | int tgid; | |
1da177e4 | 2354 | |
61a28784 EB |
2355 | if (!reaper) |
2356 | goto out_no_task; | |
2357 | ||
7bcd6b0e | 2358 | for (; nr < ARRAY_SIZE(proc_base_stuff); filp->f_pos++, nr++) { |
c5141e6d | 2359 | const struct pid_entry *p = &proc_base_stuff[nr]; |
61a28784 | 2360 | if (proc_base_fill_cache(filp, dirent, filldir, reaper, p) < 0) |
801199ce | 2361 | goto out; |
1da177e4 LT |
2362 | } |
2363 | ||
0804ef4b EB |
2364 | tgid = filp->f_pos - TGID_OFFSET; |
2365 | for (task = next_tgid(tgid); | |
0bc58a91 | 2366 | task; |
0804ef4b | 2367 | put_task_struct(task), task = next_tgid(tgid + 1)) { |
0bc58a91 | 2368 | tgid = task->pid; |
0804ef4b | 2369 | filp->f_pos = tgid + TGID_OFFSET; |
61a28784 | 2370 | if (proc_pid_fill_cache(filp, dirent, filldir, task, tgid) < 0) { |
0bc58a91 | 2371 | put_task_struct(task); |
0804ef4b | 2372 | goto out; |
1da177e4 | 2373 | } |
0bc58a91 | 2374 | } |
0804ef4b EB |
2375 | filp->f_pos = PID_MAX_LIMIT + TGID_OFFSET; |
2376 | out: | |
61a28784 EB |
2377 | put_task_struct(reaper); |
2378 | out_no_task: | |
0bc58a91 EB |
2379 | return 0; |
2380 | } | |
1da177e4 | 2381 | |
28a6d671 EB |
2382 | /* |
2383 | * Tasks | |
2384 | */ | |
c5141e6d | 2385 | static const struct pid_entry tid_base_stuff[] = { |
61a28784 | 2386 | DIR("fd", S_IRUSR|S_IXUSR, fd), |
27932742 | 2387 | DIR("fdinfo", S_IRUSR|S_IXUSR, fdinfo), |
315e28c8 | 2388 | REG("environ", S_IRUSR, environ), |
61a28784 EB |
2389 | INF("auxv", S_IRUSR, pid_auxv), |
2390 | INF("status", S_IRUGO, pid_status), | |
43ae34cb IM |
2391 | #ifdef CONFIG_SCHED_DEBUG |
2392 | REG("sched", S_IRUGO|S_IWUSR, pid_sched), | |
2393 | #endif | |
61a28784 EB |
2394 | INF("cmdline", S_IRUGO, pid_cmdline), |
2395 | INF("stat", S_IRUGO, tid_stat), | |
2396 | INF("statm", S_IRUGO, pid_statm), | |
2397 | REG("maps", S_IRUGO, maps), | |
28a6d671 | 2398 | #ifdef CONFIG_NUMA |
61a28784 | 2399 | REG("numa_maps", S_IRUGO, numa_maps), |
28a6d671 | 2400 | #endif |
61a28784 | 2401 | REG("mem", S_IRUSR|S_IWUSR, mem), |
61a28784 EB |
2402 | LNK("cwd", cwd), |
2403 | LNK("root", root), | |
2404 | LNK("exe", exe), | |
2405 | REG("mounts", S_IRUGO, mounts), | |
28a6d671 | 2406 | #ifdef CONFIG_MMU |
b813e931 | 2407 | REG("clear_refs", S_IWUSR, clear_refs), |
61a28784 | 2408 | REG("smaps", S_IRUGO, smaps), |
28a6d671 EB |
2409 | #endif |
2410 | #ifdef CONFIG_SECURITY | |
72d9dcfc | 2411 | DIR("attr", S_IRUGO|S_IXUGO, attr_dir), |
28a6d671 EB |
2412 | #endif |
2413 | #ifdef CONFIG_KALLSYMS | |
61a28784 | 2414 | INF("wchan", S_IRUGO, pid_wchan), |
28a6d671 EB |
2415 | #endif |
2416 | #ifdef CONFIG_SCHEDSTATS | |
61a28784 | 2417 | INF("schedstat", S_IRUGO, pid_schedstat), |
28a6d671 EB |
2418 | #endif |
2419 | #ifdef CONFIG_CPUSETS | |
61a28784 | 2420 | REG("cpuset", S_IRUGO, cpuset), |
28a6d671 | 2421 | #endif |
61a28784 EB |
2422 | INF("oom_score", S_IRUGO, oom_score), |
2423 | REG("oom_adj", S_IRUGO|S_IWUSR, oom_adjust), | |
28a6d671 | 2424 | #ifdef CONFIG_AUDITSYSCALL |
61a28784 | 2425 | REG("loginuid", S_IWUSR|S_IRUGO, loginuid), |
28a6d671 | 2426 | #endif |
f4f154fd AM |
2427 | #ifdef CONFIG_FAULT_INJECTION |
2428 | REG("make-it-fail", S_IRUGO|S_IWUSR, fault_inject), | |
2429 | #endif | |
28a6d671 EB |
2430 | }; |
2431 | ||
2432 | static int proc_tid_base_readdir(struct file * filp, | |
2433 | void * dirent, filldir_t filldir) | |
2434 | { | |
2435 | return proc_pident_readdir(filp,dirent,filldir, | |
2436 | tid_base_stuff,ARRAY_SIZE(tid_base_stuff)); | |
2437 | } | |
2438 | ||
2439 | static struct dentry *proc_tid_base_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd){ | |
7bcd6b0e EB |
2440 | return proc_pident_lookup(dir, dentry, |
2441 | tid_base_stuff, ARRAY_SIZE(tid_base_stuff)); | |
28a6d671 EB |
2442 | } |
2443 | ||
00977a59 | 2444 | static const struct file_operations proc_tid_base_operations = { |
28a6d671 EB |
2445 | .read = generic_read_dir, |
2446 | .readdir = proc_tid_base_readdir, | |
2447 | }; | |
2448 | ||
c5ef1c42 | 2449 | static const struct inode_operations proc_tid_base_inode_operations = { |
28a6d671 EB |
2450 | .lookup = proc_tid_base_lookup, |
2451 | .getattr = pid_getattr, | |
2452 | .setattr = proc_setattr, | |
2453 | }; | |
2454 | ||
444ceed8 | 2455 | static struct dentry *proc_task_instantiate(struct inode *dir, |
c5141e6d | 2456 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
444ceed8 EB |
2457 | { |
2458 | struct dentry *error = ERR_PTR(-ENOENT); | |
2459 | struct inode *inode; | |
61a28784 | 2460 | inode = proc_pid_make_inode(dir->i_sb, task); |
444ceed8 EB |
2461 | |
2462 | if (!inode) | |
2463 | goto out; | |
2464 | inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO; | |
2465 | inode->i_op = &proc_tid_base_inode_operations; | |
2466 | inode->i_fop = &proc_tid_base_operations; | |
2467 | inode->i_flags|=S_IMMUTABLE; | |
27932742 | 2468 | inode->i_nlink = 4; |
444ceed8 EB |
2469 | #ifdef CONFIG_SECURITY |
2470 | inode->i_nlink += 1; | |
2471 | #endif | |
2472 | ||
2473 | dentry->d_op = &pid_dentry_operations; | |
2474 | ||
2475 | d_add(dentry, inode); | |
2476 | /* Close the race of the process dying before we return the dentry */ | |
2477 | if (pid_revalidate(dentry, NULL)) | |
2478 | error = NULL; | |
2479 | out: | |
2480 | return error; | |
2481 | } | |
2482 | ||
28a6d671 EB |
2483 | static struct dentry *proc_task_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd) |
2484 | { | |
2485 | struct dentry *result = ERR_PTR(-ENOENT); | |
2486 | struct task_struct *task; | |
2487 | struct task_struct *leader = get_proc_task(dir); | |
28a6d671 EB |
2488 | unsigned tid; |
2489 | ||
2490 | if (!leader) | |
2491 | goto out_no_task; | |
2492 | ||
2493 | tid = name_to_int(dentry); | |
2494 | if (tid == ~0U) | |
2495 | goto out; | |
2496 | ||
2497 | rcu_read_lock(); | |
2498 | task = find_task_by_pid(tid); | |
2499 | if (task) | |
2500 | get_task_struct(task); | |
2501 | rcu_read_unlock(); | |
2502 | if (!task) | |
2503 | goto out; | |
2504 | if (leader->tgid != task->tgid) | |
2505 | goto out_drop_task; | |
2506 | ||
444ceed8 | 2507 | result = proc_task_instantiate(dir, dentry, task, NULL); |
28a6d671 EB |
2508 | out_drop_task: |
2509 | put_task_struct(task); | |
2510 | out: | |
2511 | put_task_struct(leader); | |
2512 | out_no_task: | |
2513 | return result; | |
2514 | } | |
2515 | ||
0bc58a91 EB |
2516 | /* |
2517 | * Find the first tid of a thread group to return to user space. | |
2518 | * | |
2519 | * Usually this is just the thread group leader, but if the users | |
2520 | * buffer was too small or there was a seek into the middle of the | |
2521 | * directory we have more work todo. | |
2522 | * | |
2523 | * In the case of a short read we start with find_task_by_pid. | |
2524 | * | |
2525 | * In the case of a seek we start with the leader and walk nr | |
2526 | * threads past it. | |
2527 | */ | |
cc288738 EB |
2528 | static struct task_struct *first_tid(struct task_struct *leader, |
2529 | int tid, int nr) | |
0bc58a91 | 2530 | { |
a872ff0c | 2531 | struct task_struct *pos; |
1da177e4 | 2532 | |
cc288738 | 2533 | rcu_read_lock(); |
0bc58a91 EB |
2534 | /* Attempt to start with the pid of a thread */ |
2535 | if (tid && (nr > 0)) { | |
2536 | pos = find_task_by_pid(tid); | |
a872ff0c ON |
2537 | if (pos && (pos->group_leader == leader)) |
2538 | goto found; | |
0bc58a91 | 2539 | } |
1da177e4 | 2540 | |
0bc58a91 | 2541 | /* If nr exceeds the number of threads there is nothing todo */ |
a872ff0c ON |
2542 | pos = NULL; |
2543 | if (nr && nr >= get_nr_threads(leader)) | |
2544 | goto out; | |
1da177e4 | 2545 | |
a872ff0c ON |
2546 | /* If we haven't found our starting place yet start |
2547 | * with the leader and walk nr threads forward. | |
0bc58a91 | 2548 | */ |
a872ff0c ON |
2549 | for (pos = leader; nr > 0; --nr) { |
2550 | pos = next_thread(pos); | |
2551 | if (pos == leader) { | |
2552 | pos = NULL; | |
2553 | goto out; | |
2554 | } | |
1da177e4 | 2555 | } |
a872ff0c ON |
2556 | found: |
2557 | get_task_struct(pos); | |
2558 | out: | |
cc288738 | 2559 | rcu_read_unlock(); |
0bc58a91 EB |
2560 | return pos; |
2561 | } | |
2562 | ||
2563 | /* | |
2564 | * Find the next thread in the thread list. | |
2565 | * Return NULL if there is an error or no next thread. | |
2566 | * | |
2567 | * The reference to the input task_struct is released. | |
2568 | */ | |
2569 | static struct task_struct *next_tid(struct task_struct *start) | |
2570 | { | |
c1df7fb8 | 2571 | struct task_struct *pos = NULL; |
cc288738 | 2572 | rcu_read_lock(); |
c1df7fb8 | 2573 | if (pid_alive(start)) { |
0bc58a91 | 2574 | pos = next_thread(start); |
c1df7fb8 ON |
2575 | if (thread_group_leader(pos)) |
2576 | pos = NULL; | |
2577 | else | |
2578 | get_task_struct(pos); | |
2579 | } | |
cc288738 | 2580 | rcu_read_unlock(); |
0bc58a91 EB |
2581 | put_task_struct(start); |
2582 | return pos; | |
1da177e4 LT |
2583 | } |
2584 | ||
61a28784 EB |
2585 | static int proc_task_fill_cache(struct file *filp, void *dirent, filldir_t filldir, |
2586 | struct task_struct *task, int tid) | |
2587 | { | |
2588 | char name[PROC_NUMBUF]; | |
2589 | int len = snprintf(name, sizeof(name), "%d", tid); | |
2590 | return proc_fill_cache(filp, dirent, filldir, name, len, | |
2591 | proc_task_instantiate, task, NULL); | |
2592 | } | |
2593 | ||
1da177e4 LT |
2594 | /* for the /proc/TGID/task/ directories */ |
2595 | static int proc_task_readdir(struct file * filp, void * dirent, filldir_t filldir) | |
2596 | { | |
2fddfeef | 2597 | struct dentry *dentry = filp->f_path.dentry; |
1da177e4 | 2598 | struct inode *inode = dentry->d_inode; |
7d895244 | 2599 | struct task_struct *leader = NULL; |
0bc58a91 | 2600 | struct task_struct *task; |
1da177e4 LT |
2601 | int retval = -ENOENT; |
2602 | ino_t ino; | |
0bc58a91 | 2603 | int tid; |
1da177e4 LT |
2604 | unsigned long pos = filp->f_pos; /* avoiding "long long" filp->f_pos */ |
2605 | ||
7d895244 GC |
2606 | task = get_proc_task(inode); |
2607 | if (!task) | |
2608 | goto out_no_task; | |
2609 | rcu_read_lock(); | |
2610 | if (pid_alive(task)) { | |
2611 | leader = task->group_leader; | |
2612 | get_task_struct(leader); | |
2613 | } | |
2614 | rcu_read_unlock(); | |
2615 | put_task_struct(task); | |
99f89551 EB |
2616 | if (!leader) |
2617 | goto out_no_task; | |
1da177e4 LT |
2618 | retval = 0; |
2619 | ||
2620 | switch (pos) { | |
2621 | case 0: | |
2622 | ino = inode->i_ino; | |
2623 | if (filldir(dirent, ".", 1, pos, ino, DT_DIR) < 0) | |
2624 | goto out; | |
2625 | pos++; | |
2626 | /* fall through */ | |
2627 | case 1: | |
2628 | ino = parent_ino(dentry); | |
2629 | if (filldir(dirent, "..", 2, pos, ino, DT_DIR) < 0) | |
2630 | goto out; | |
2631 | pos++; | |
2632 | /* fall through */ | |
2633 | } | |
2634 | ||
0bc58a91 EB |
2635 | /* f_version caches the tgid value that the last readdir call couldn't |
2636 | * return. lseek aka telldir automagically resets f_version to 0. | |
2637 | */ | |
2b47c361 | 2638 | tid = (int)filp->f_version; |
0bc58a91 EB |
2639 | filp->f_version = 0; |
2640 | for (task = first_tid(leader, tid, pos - 2); | |
2641 | task; | |
2642 | task = next_tid(task), pos++) { | |
0bc58a91 | 2643 | tid = task->pid; |
61a28784 | 2644 | if (proc_task_fill_cache(filp, dirent, filldir, task, tid) < 0) { |
0bc58a91 EB |
2645 | /* returning this tgid failed, save it as the first |
2646 | * pid for the next readir call */ | |
2b47c361 | 2647 | filp->f_version = (u64)tid; |
0bc58a91 | 2648 | put_task_struct(task); |
1da177e4 | 2649 | break; |
0bc58a91 | 2650 | } |
1da177e4 LT |
2651 | } |
2652 | out: | |
2653 | filp->f_pos = pos; | |
99f89551 EB |
2654 | put_task_struct(leader); |
2655 | out_no_task: | |
1da177e4 LT |
2656 | return retval; |
2657 | } | |
6e66b52b EB |
2658 | |
2659 | static int proc_task_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) | |
2660 | { | |
2661 | struct inode *inode = dentry->d_inode; | |
99f89551 | 2662 | struct task_struct *p = get_proc_task(inode); |
6e66b52b EB |
2663 | generic_fillattr(inode, stat); |
2664 | ||
99f89551 EB |
2665 | if (p) { |
2666 | rcu_read_lock(); | |
2667 | stat->nlink += get_nr_threads(p); | |
2668 | rcu_read_unlock(); | |
2669 | put_task_struct(p); | |
6e66b52b EB |
2670 | } |
2671 | ||
2672 | return 0; | |
2673 | } | |
28a6d671 | 2674 | |
c5ef1c42 | 2675 | static const struct inode_operations proc_task_inode_operations = { |
28a6d671 EB |
2676 | .lookup = proc_task_lookup, |
2677 | .getattr = proc_task_getattr, | |
2678 | .setattr = proc_setattr, | |
2679 | }; | |
2680 | ||
00977a59 | 2681 | static const struct file_operations proc_task_operations = { |
28a6d671 EB |
2682 | .read = generic_read_dir, |
2683 | .readdir = proc_task_readdir, | |
2684 | }; |