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