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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/fs/proc/base.c | |
3 | * | |
4 | * Copyright (C) 1991, 1992 Linus Torvalds | |
5 | * | |
6 | * proc base directory handling functions | |
7 | * | |
8 | * 1999, Al Viro. Rewritten. Now it covers the whole per-process part. | |
9 | * Instead of using magical inumbers to determine the kind of object | |
10 | * we allocate and fill in-core inodes upon lookup. They don't even | |
11 | * go into icache. We cache the reference to task_struct upon lookup too. | |
12 | * Eventually it should become a filesystem in its own. We don't use the | |
13 | * rest of procfs anymore. | |
e070ad49 ML |
14 | * |
15 | * | |
16 | * Changelog: | |
17 | * 17-Jan-2005 | |
18 | * Allan Bezerra | |
19 | * Bruna Moreira <bruna.moreira@indt.org.br> | |
20 | * Edjard Mota <edjard.mota@indt.org.br> | |
21 | * Ilias Biris <ilias.biris@indt.org.br> | |
22 | * Mauricio Lin <mauricio.lin@indt.org.br> | |
23 | * | |
24 | * Embedded Linux Lab - 10LE Instituto Nokia de Tecnologia - INdT | |
25 | * | |
26 | * A new process specific entry (smaps) included in /proc. It shows the | |
27 | * size of rss for each memory area. The maps entry lacks information | |
28 | * about physical memory size (rss) for each mapped file, i.e., | |
29 | * rss information for executables and library files. | |
30 | * This additional information is useful for any tools that need to know | |
31 | * about physical memory consumption for a process specific library. | |
32 | * | |
33 | * Changelog: | |
34 | * 21-Feb-2005 | |
35 | * Embedded Linux Lab - 10LE Instituto Nokia de Tecnologia - INdT | |
36 | * Pud inclusion in the page table walking. | |
37 | * | |
38 | * ChangeLog: | |
39 | * 10-Mar-2005 | |
40 | * 10LE Instituto Nokia de Tecnologia - INdT: | |
41 | * A better way to walks through the page table as suggested by Hugh Dickins. | |
42 | * | |
43 | * Simo Piiroinen <simo.piiroinen@nokia.com>: | |
44 | * Smaps information related to shared, private, clean and dirty pages. | |
45 | * | |
46 | * Paul Mundt <paul.mundt@nokia.com>: | |
47 | * Overall revision about smaps. | |
1da177e4 LT |
48 | */ |
49 | ||
50 | #include <asm/uaccess.h> | |
51 | ||
1da177e4 LT |
52 | #include <linux/errno.h> |
53 | #include <linux/time.h> | |
54 | #include <linux/proc_fs.h> | |
55 | #include <linux/stat.h> | |
56 | #include <linux/init.h> | |
16f7e0fe | 57 | #include <linux/capability.h> |
1da177e4 LT |
58 | #include <linux/file.h> |
59 | #include <linux/string.h> | |
60 | #include <linux/seq_file.h> | |
61 | #include <linux/namei.h> | |
6b3286ed | 62 | #include <linux/mnt_namespace.h> |
1da177e4 | 63 | #include <linux/mm.h> |
b835996f | 64 | #include <linux/rcupdate.h> |
1da177e4 | 65 | #include <linux/kallsyms.h> |
5096add8 | 66 | #include <linux/module.h> |
1da177e4 LT |
67 | #include <linux/mount.h> |
68 | #include <linux/security.h> | |
69 | #include <linux/ptrace.h> | |
1da177e4 LT |
70 | #include <linux/cpuset.h> |
71 | #include <linux/audit.h> | |
5addc5dd | 72 | #include <linux/poll.h> |
1651e14e | 73 | #include <linux/nsproxy.h> |
8ac773b4 | 74 | #include <linux/oom.h> |
3cb4a0bb | 75 | #include <linux/elf.h> |
1da177e4 LT |
76 | #include "internal.h" |
77 | ||
0f2fe20f EB |
78 | /* NOTE: |
79 | * Implementing inode permission operations in /proc is almost | |
80 | * certainly an error. Permission checks need to happen during | |
81 | * each system call not at open time. The reason is that most of | |
82 | * what we wish to check for permissions in /proc varies at runtime. | |
83 | * | |
84 | * The classic example of a problem is opening file descriptors | |
85 | * in /proc for a task before it execs a suid executable. | |
86 | */ | |
87 | ||
1da177e4 | 88 | |
8578cea7 | 89 | /* Worst case buffer size needed for holding an integer. */ |
0187f879 | 90 | #define PROC_NUMBUF 13 |
8578cea7 | 91 | |
1da177e4 | 92 | struct pid_entry { |
1da177e4 | 93 | char *name; |
c5141e6d | 94 | int len; |
1da177e4 | 95 | mode_t mode; |
c5ef1c42 | 96 | const struct inode_operations *iop; |
00977a59 | 97 | const struct file_operations *fop; |
20cdc894 | 98 | union proc_op op; |
1da177e4 LT |
99 | }; |
100 | ||
61a28784 | 101 | #define NOD(NAME, MODE, IOP, FOP, OP) { \ |
20cdc894 | 102 | .name = (NAME), \ |
c5141e6d | 103 | .len = sizeof(NAME) - 1, \ |
20cdc894 EB |
104 | .mode = MODE, \ |
105 | .iop = IOP, \ | |
106 | .fop = FOP, \ | |
107 | .op = OP, \ | |
108 | } | |
109 | ||
61a28784 EB |
110 | #define DIR(NAME, MODE, OTYPE) \ |
111 | NOD(NAME, (S_IFDIR|(MODE)), \ | |
20cdc894 EB |
112 | &proc_##OTYPE##_inode_operations, &proc_##OTYPE##_operations, \ |
113 | {} ) | |
61a28784 EB |
114 | #define LNK(NAME, OTYPE) \ |
115 | NOD(NAME, (S_IFLNK|S_IRWXUGO), \ | |
20cdc894 EB |
116 | &proc_pid_link_inode_operations, NULL, \ |
117 | { .proc_get_link = &proc_##OTYPE##_link } ) | |
61a28784 EB |
118 | #define REG(NAME, MODE, OTYPE) \ |
119 | NOD(NAME, (S_IFREG|(MODE)), NULL, \ | |
20cdc894 | 120 | &proc_##OTYPE##_operations, {}) |
61a28784 EB |
121 | #define INF(NAME, MODE, OTYPE) \ |
122 | NOD(NAME, (S_IFREG|(MODE)), \ | |
20cdc894 EB |
123 | NULL, &proc_info_file_operations, \ |
124 | { .proc_read = &proc_##OTYPE } ) | |
1da177e4 | 125 | |
5096add8 KC |
126 | int maps_protect; |
127 | EXPORT_SYMBOL(maps_protect); | |
128 | ||
0494f6ec | 129 | static struct fs_struct *get_fs_struct(struct task_struct *task) |
1da177e4 LT |
130 | { |
131 | struct fs_struct *fs; | |
0494f6ec MS |
132 | task_lock(task); |
133 | fs = task->fs; | |
1da177e4 LT |
134 | if(fs) |
135 | atomic_inc(&fs->count); | |
0494f6ec MS |
136 | task_unlock(task); |
137 | return fs; | |
138 | } | |
139 | ||
99f89551 EB |
140 | static int get_nr_threads(struct task_struct *tsk) |
141 | { | |
142 | /* Must be called with the rcu_read_lock held */ | |
143 | unsigned long flags; | |
144 | int count = 0; | |
145 | ||
146 | if (lock_task_sighand(tsk, &flags)) { | |
147 | count = atomic_read(&tsk->signal->count); | |
148 | unlock_task_sighand(tsk, &flags); | |
149 | } | |
150 | return count; | |
151 | } | |
152 | ||
0494f6ec MS |
153 | static int proc_cwd_link(struct inode *inode, struct dentry **dentry, struct vfsmount **mnt) |
154 | { | |
99f89551 EB |
155 | struct task_struct *task = get_proc_task(inode); |
156 | struct fs_struct *fs = NULL; | |
0494f6ec | 157 | int result = -ENOENT; |
99f89551 EB |
158 | |
159 | if (task) { | |
160 | fs = get_fs_struct(task); | |
161 | put_task_struct(task); | |
162 | } | |
1da177e4 LT |
163 | if (fs) { |
164 | read_lock(&fs->lock); | |
165 | *mnt = mntget(fs->pwdmnt); | |
166 | *dentry = dget(fs->pwd); | |
167 | read_unlock(&fs->lock); | |
168 | result = 0; | |
169 | put_fs_struct(fs); | |
170 | } | |
171 | return result; | |
172 | } | |
173 | ||
174 | static int proc_root_link(struct inode *inode, struct dentry **dentry, struct vfsmount **mnt) | |
175 | { | |
99f89551 EB |
176 | struct task_struct *task = get_proc_task(inode); |
177 | struct fs_struct *fs = NULL; | |
1da177e4 | 178 | int result = -ENOENT; |
99f89551 EB |
179 | |
180 | if (task) { | |
181 | fs = get_fs_struct(task); | |
182 | put_task_struct(task); | |
183 | } | |
1da177e4 LT |
184 | if (fs) { |
185 | read_lock(&fs->lock); | |
186 | *mnt = mntget(fs->rootmnt); | |
187 | *dentry = dget(fs->root); | |
188 | read_unlock(&fs->lock); | |
189 | result = 0; | |
190 | put_fs_struct(fs); | |
191 | } | |
192 | return result; | |
193 | } | |
194 | ||
195 | #define MAY_PTRACE(task) \ | |
196 | (task == current || \ | |
197 | (task->parent == current && \ | |
198 | (task->ptrace & PT_PTRACED) && \ | |
199 | (task->state == TASK_STOPPED || task->state == TASK_TRACED) && \ | |
200 | security_ptrace(current,task) == 0)) | |
201 | ||
1da177e4 LT |
202 | static int proc_pid_environ(struct task_struct *task, char * buffer) |
203 | { | |
204 | int res = 0; | |
205 | struct mm_struct *mm = get_task_mm(task); | |
206 | if (mm) { | |
da58a161 AD |
207 | unsigned int len; |
208 | ||
209 | res = -ESRCH; | |
210 | if (!ptrace_may_attach(task)) | |
211 | goto out; | |
212 | ||
213 | len = mm->env_end - mm->env_start; | |
1da177e4 LT |
214 | if (len > PAGE_SIZE) |
215 | len = PAGE_SIZE; | |
216 | res = access_process_vm(task, mm->env_start, buffer, len, 0); | |
da58a161 | 217 | out: |
1da177e4 LT |
218 | mmput(mm); |
219 | } | |
220 | return res; | |
221 | } | |
222 | ||
223 | static int proc_pid_cmdline(struct task_struct *task, char * buffer) | |
224 | { | |
225 | int res = 0; | |
226 | unsigned int len; | |
227 | struct mm_struct *mm = get_task_mm(task); | |
228 | if (!mm) | |
229 | goto out; | |
230 | if (!mm->arg_end) | |
231 | goto out_mm; /* Shh! No looking before we're done */ | |
232 | ||
233 | len = mm->arg_end - mm->arg_start; | |
234 | ||
235 | if (len > PAGE_SIZE) | |
236 | len = PAGE_SIZE; | |
237 | ||
238 | res = access_process_vm(task, mm->arg_start, buffer, len, 0); | |
239 | ||
240 | // If the nul at the end of args has been overwritten, then | |
241 | // assume application is using setproctitle(3). | |
242 | if (res > 0 && buffer[res-1] != '\0' && len < PAGE_SIZE) { | |
243 | len = strnlen(buffer, res); | |
244 | if (len < res) { | |
245 | res = len; | |
246 | } else { | |
247 | len = mm->env_end - mm->env_start; | |
248 | if (len > PAGE_SIZE - res) | |
249 | len = PAGE_SIZE - res; | |
250 | res += access_process_vm(task, mm->env_start, buffer+res, len, 0); | |
251 | res = strnlen(buffer, res); | |
252 | } | |
253 | } | |
254 | out_mm: | |
255 | mmput(mm); | |
256 | out: | |
257 | return res; | |
258 | } | |
259 | ||
260 | static int proc_pid_auxv(struct task_struct *task, char *buffer) | |
261 | { | |
262 | int res = 0; | |
263 | struct mm_struct *mm = get_task_mm(task); | |
264 | if (mm) { | |
265 | unsigned int nwords = 0; | |
266 | do | |
267 | nwords += 2; | |
268 | while (mm->saved_auxv[nwords - 2] != 0); /* AT_NULL */ | |
269 | res = nwords * sizeof(mm->saved_auxv[0]); | |
270 | if (res > PAGE_SIZE) | |
271 | res = PAGE_SIZE; | |
272 | memcpy(buffer, mm->saved_auxv, res); | |
273 | mmput(mm); | |
274 | } | |
275 | return res; | |
276 | } | |
277 | ||
278 | ||
279 | #ifdef CONFIG_KALLSYMS | |
280 | /* | |
281 | * Provides a wchan file via kallsyms in a proper one-value-per-file format. | |
282 | * Returns the resolved symbol. If that fails, simply return the address. | |
283 | */ | |
284 | static int proc_pid_wchan(struct task_struct *task, char *buffer) | |
285 | { | |
ffb45122 | 286 | unsigned long wchan; |
9281acea | 287 | char symname[KSYM_NAME_LEN]; |
1da177e4 LT |
288 | |
289 | wchan = get_wchan(task); | |
290 | ||
9d65cb4a AD |
291 | if (lookup_symbol_name(wchan, symname) < 0) |
292 | return sprintf(buffer, "%lu", wchan); | |
293 | else | |
294 | return sprintf(buffer, "%s", symname); | |
1da177e4 LT |
295 | } |
296 | #endif /* CONFIG_KALLSYMS */ | |
297 | ||
298 | #ifdef CONFIG_SCHEDSTATS | |
299 | /* | |
300 | * Provides /proc/PID/schedstat | |
301 | */ | |
302 | static int proc_pid_schedstat(struct task_struct *task, char *buffer) | |
303 | { | |
172ba844 | 304 | return sprintf(buffer, "%llu %llu %lu\n", |
1da177e4 LT |
305 | task->sched_info.cpu_time, |
306 | task->sched_info.run_delay, | |
2d72376b | 307 | task->sched_info.pcount); |
1da177e4 LT |
308 | } |
309 | #endif | |
310 | ||
311 | /* The badness from the OOM killer */ | |
312 | unsigned long badness(struct task_struct *p, unsigned long uptime); | |
313 | static int proc_oom_score(struct task_struct *task, char *buffer) | |
314 | { | |
315 | unsigned long points; | |
316 | struct timespec uptime; | |
317 | ||
318 | do_posix_clock_monotonic_gettime(&uptime); | |
19c5d45a | 319 | read_lock(&tasklist_lock); |
1da177e4 | 320 | points = badness(task, uptime.tv_sec); |
19c5d45a | 321 | read_unlock(&tasklist_lock); |
1da177e4 LT |
322 | return sprintf(buffer, "%lu\n", points); |
323 | } | |
324 | ||
325 | /************************************************************************/ | |
326 | /* Here the fs part begins */ | |
327 | /************************************************************************/ | |
328 | ||
329 | /* permission checks */ | |
778c1144 | 330 | static int proc_fd_access_allowed(struct inode *inode) |
1da177e4 | 331 | { |
778c1144 EB |
332 | struct task_struct *task; |
333 | int allowed = 0; | |
df26c40e EB |
334 | /* Allow access to a task's file descriptors if it is us or we |
335 | * may use ptrace attach to the process and find out that | |
336 | * information. | |
778c1144 EB |
337 | */ |
338 | task = get_proc_task(inode); | |
df26c40e EB |
339 | if (task) { |
340 | allowed = ptrace_may_attach(task); | |
778c1144 | 341 | put_task_struct(task); |
df26c40e | 342 | } |
778c1144 | 343 | return allowed; |
1da177e4 LT |
344 | } |
345 | ||
6d76fa58 LT |
346 | static int proc_setattr(struct dentry *dentry, struct iattr *attr) |
347 | { | |
348 | int error; | |
349 | struct inode *inode = dentry->d_inode; | |
350 | ||
351 | if (attr->ia_valid & ATTR_MODE) | |
352 | return -EPERM; | |
353 | ||
354 | error = inode_change_ok(inode, attr); | |
1e8123fd JJ |
355 | if (!error) |
356 | error = inode_setattr(inode, attr); | |
6d76fa58 LT |
357 | return error; |
358 | } | |
359 | ||
c5ef1c42 | 360 | static const struct inode_operations proc_def_inode_operations = { |
6d76fa58 LT |
361 | .setattr = proc_setattr, |
362 | }; | |
363 | ||
1da177e4 | 364 | extern struct seq_operations mounts_op; |
5addc5dd AV |
365 | struct proc_mounts { |
366 | struct seq_file m; | |
367 | int event; | |
368 | }; | |
369 | ||
1da177e4 LT |
370 | static int mounts_open(struct inode *inode, struct file *file) |
371 | { | |
99f89551 | 372 | struct task_struct *task = get_proc_task(inode); |
6b3286ed | 373 | struct mnt_namespace *ns = NULL; |
5addc5dd AV |
374 | struct proc_mounts *p; |
375 | int ret = -EINVAL; | |
1da177e4 | 376 | |
99f89551 EB |
377 | if (task) { |
378 | task_lock(task); | |
863c4702 AD |
379 | if (task->nsproxy) { |
380 | ns = task->nsproxy->mnt_ns; | |
381 | if (ns) | |
382 | get_mnt_ns(ns); | |
383 | } | |
99f89551 EB |
384 | task_unlock(task); |
385 | put_task_struct(task); | |
386 | } | |
5addc5dd | 387 | |
6b3286ed | 388 | if (ns) { |
5addc5dd AV |
389 | ret = -ENOMEM; |
390 | p = kmalloc(sizeof(struct proc_mounts), GFP_KERNEL); | |
391 | if (p) { | |
392 | file->private_data = &p->m; | |
393 | ret = seq_open(file, &mounts_op); | |
394 | if (!ret) { | |
6b3286ed KK |
395 | p->m.private = ns; |
396 | p->event = ns->event; | |
5addc5dd AV |
397 | return 0; |
398 | } | |
399 | kfree(p); | |
1da177e4 | 400 | } |
6b3286ed | 401 | put_mnt_ns(ns); |
1da177e4 LT |
402 | } |
403 | return ret; | |
404 | } | |
405 | ||
406 | static int mounts_release(struct inode *inode, struct file *file) | |
407 | { | |
408 | struct seq_file *m = file->private_data; | |
6b3286ed KK |
409 | struct mnt_namespace *ns = m->private; |
410 | put_mnt_ns(ns); | |
1da177e4 LT |
411 | return seq_release(inode, file); |
412 | } | |
413 | ||
5addc5dd AV |
414 | static unsigned mounts_poll(struct file *file, poll_table *wait) |
415 | { | |
416 | struct proc_mounts *p = file->private_data; | |
6b3286ed | 417 | struct mnt_namespace *ns = p->m.private; |
5addc5dd AV |
418 | unsigned res = 0; |
419 | ||
420 | poll_wait(file, &ns->poll, wait); | |
421 | ||
422 | spin_lock(&vfsmount_lock); | |
423 | if (p->event != ns->event) { | |
424 | p->event = ns->event; | |
425 | res = POLLERR; | |
426 | } | |
427 | spin_unlock(&vfsmount_lock); | |
428 | ||
429 | return res; | |
430 | } | |
431 | ||
00977a59 | 432 | static const struct file_operations proc_mounts_operations = { |
1da177e4 LT |
433 | .open = mounts_open, |
434 | .read = seq_read, | |
435 | .llseek = seq_lseek, | |
436 | .release = mounts_release, | |
5addc5dd | 437 | .poll = mounts_poll, |
1da177e4 LT |
438 | }; |
439 | ||
b4629fe2 CL |
440 | extern struct seq_operations mountstats_op; |
441 | static int mountstats_open(struct inode *inode, struct file *file) | |
442 | { | |
b4629fe2 CL |
443 | int ret = seq_open(file, &mountstats_op); |
444 | ||
445 | if (!ret) { | |
446 | struct seq_file *m = file->private_data; | |
6b3286ed | 447 | struct mnt_namespace *mnt_ns = NULL; |
99f89551 EB |
448 | struct task_struct *task = get_proc_task(inode); |
449 | ||
450 | if (task) { | |
451 | task_lock(task); | |
701e054e | 452 | if (task->nsproxy) |
6b3286ed KK |
453 | mnt_ns = task->nsproxy->mnt_ns; |
454 | if (mnt_ns) | |
455 | get_mnt_ns(mnt_ns); | |
99f89551 EB |
456 | task_unlock(task); |
457 | put_task_struct(task); | |
458 | } | |
b4629fe2 | 459 | |
6b3286ed KK |
460 | if (mnt_ns) |
461 | m->private = mnt_ns; | |
b4629fe2 CL |
462 | else { |
463 | seq_release(inode, file); | |
464 | ret = -EINVAL; | |
465 | } | |
466 | } | |
467 | return ret; | |
468 | } | |
469 | ||
00977a59 | 470 | static const struct file_operations proc_mountstats_operations = { |
b4629fe2 CL |
471 | .open = mountstats_open, |
472 | .read = seq_read, | |
473 | .llseek = seq_lseek, | |
474 | .release = mounts_release, | |
475 | }; | |
476 | ||
1da177e4 LT |
477 | #define PROC_BLOCK_SIZE (3*1024) /* 4K page size but our output routines use some slack for overruns */ |
478 | ||
479 | static ssize_t proc_info_read(struct file * file, char __user * buf, | |
480 | size_t count, loff_t *ppos) | |
481 | { | |
2fddfeef | 482 | struct inode * inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
483 | unsigned long page; |
484 | ssize_t length; | |
99f89551 EB |
485 | struct task_struct *task = get_proc_task(inode); |
486 | ||
487 | length = -ESRCH; | |
488 | if (!task) | |
489 | goto out_no_task; | |
1da177e4 LT |
490 | |
491 | if (count > PROC_BLOCK_SIZE) | |
492 | count = PROC_BLOCK_SIZE; | |
99f89551 EB |
493 | |
494 | length = -ENOMEM; | |
e12ba74d | 495 | if (!(page = __get_free_page(GFP_TEMPORARY))) |
99f89551 | 496 | goto out; |
1da177e4 LT |
497 | |
498 | length = PROC_I(inode)->op.proc_read(task, (char*)page); | |
499 | ||
500 | if (length >= 0) | |
501 | length = simple_read_from_buffer(buf, count, ppos, (char *)page, length); | |
502 | free_page(page); | |
99f89551 EB |
503 | out: |
504 | put_task_struct(task); | |
505 | out_no_task: | |
1da177e4 LT |
506 | return length; |
507 | } | |
508 | ||
00977a59 | 509 | static const struct file_operations proc_info_file_operations = { |
1da177e4 LT |
510 | .read = proc_info_read, |
511 | }; | |
512 | ||
513 | static int mem_open(struct inode* inode, struct file* file) | |
514 | { | |
515 | file->private_data = (void*)((long)current->self_exec_id); | |
516 | return 0; | |
517 | } | |
518 | ||
519 | static ssize_t mem_read(struct file * file, char __user * buf, | |
520 | size_t count, loff_t *ppos) | |
521 | { | |
2fddfeef | 522 | struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode); |
1da177e4 LT |
523 | char *page; |
524 | unsigned long src = *ppos; | |
525 | int ret = -ESRCH; | |
526 | struct mm_struct *mm; | |
527 | ||
99f89551 EB |
528 | if (!task) |
529 | goto out_no_task; | |
530 | ||
ab8d11be | 531 | if (!MAY_PTRACE(task) || !ptrace_may_attach(task)) |
1da177e4 LT |
532 | goto out; |
533 | ||
534 | ret = -ENOMEM; | |
e12ba74d | 535 | page = (char *)__get_free_page(GFP_TEMPORARY); |
1da177e4 LT |
536 | if (!page) |
537 | goto out; | |
538 | ||
539 | ret = 0; | |
540 | ||
541 | mm = get_task_mm(task); | |
542 | if (!mm) | |
543 | goto out_free; | |
544 | ||
545 | ret = -EIO; | |
546 | ||
547 | if (file->private_data != (void*)((long)current->self_exec_id)) | |
548 | goto out_put; | |
549 | ||
550 | ret = 0; | |
551 | ||
552 | while (count > 0) { | |
553 | int this_len, retval; | |
554 | ||
555 | this_len = (count > PAGE_SIZE) ? PAGE_SIZE : count; | |
556 | retval = access_process_vm(task, src, page, this_len, 0); | |
ab8d11be | 557 | if (!retval || !MAY_PTRACE(task) || !ptrace_may_attach(task)) { |
1da177e4 LT |
558 | if (!ret) |
559 | ret = -EIO; | |
560 | break; | |
561 | } | |
562 | ||
563 | if (copy_to_user(buf, page, retval)) { | |
564 | ret = -EFAULT; | |
565 | break; | |
566 | } | |
567 | ||
568 | ret += retval; | |
569 | src += retval; | |
570 | buf += retval; | |
571 | count -= retval; | |
572 | } | |
573 | *ppos = src; | |
574 | ||
575 | out_put: | |
576 | mmput(mm); | |
577 | out_free: | |
578 | free_page((unsigned long) page); | |
579 | out: | |
99f89551 EB |
580 | put_task_struct(task); |
581 | out_no_task: | |
1da177e4 LT |
582 | return ret; |
583 | } | |
584 | ||
585 | #define mem_write NULL | |
586 | ||
587 | #ifndef mem_write | |
588 | /* This is a security hazard */ | |
63967fa9 | 589 | static ssize_t mem_write(struct file * file, const char __user *buf, |
1da177e4 LT |
590 | size_t count, loff_t *ppos) |
591 | { | |
f7ca54f4 | 592 | int copied; |
1da177e4 | 593 | char *page; |
2fddfeef | 594 | struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode); |
1da177e4 LT |
595 | unsigned long dst = *ppos; |
596 | ||
99f89551 EB |
597 | copied = -ESRCH; |
598 | if (!task) | |
599 | goto out_no_task; | |
600 | ||
ab8d11be | 601 | if (!MAY_PTRACE(task) || !ptrace_may_attach(task)) |
99f89551 | 602 | goto out; |
1da177e4 | 603 | |
99f89551 | 604 | copied = -ENOMEM; |
e12ba74d | 605 | page = (char *)__get_free_page(GFP_TEMPORARY); |
1da177e4 | 606 | if (!page) |
99f89551 | 607 | goto out; |
1da177e4 | 608 | |
f7ca54f4 | 609 | copied = 0; |
1da177e4 LT |
610 | while (count > 0) { |
611 | int this_len, retval; | |
612 | ||
613 | this_len = (count > PAGE_SIZE) ? PAGE_SIZE : count; | |
614 | if (copy_from_user(page, buf, this_len)) { | |
615 | copied = -EFAULT; | |
616 | break; | |
617 | } | |
618 | retval = access_process_vm(task, dst, page, this_len, 1); | |
619 | if (!retval) { | |
620 | if (!copied) | |
621 | copied = -EIO; | |
622 | break; | |
623 | } | |
624 | copied += retval; | |
625 | buf += retval; | |
626 | dst += retval; | |
627 | count -= retval; | |
628 | } | |
629 | *ppos = dst; | |
630 | free_page((unsigned long) page); | |
99f89551 EB |
631 | out: |
632 | put_task_struct(task); | |
633 | out_no_task: | |
1da177e4 LT |
634 | return copied; |
635 | } | |
636 | #endif | |
637 | ||
638 | static loff_t mem_lseek(struct file * file, loff_t offset, int orig) | |
639 | { | |
640 | switch (orig) { | |
641 | case 0: | |
642 | file->f_pos = offset; | |
643 | break; | |
644 | case 1: | |
645 | file->f_pos += offset; | |
646 | break; | |
647 | default: | |
648 | return -EINVAL; | |
649 | } | |
650 | force_successful_syscall_return(); | |
651 | return file->f_pos; | |
652 | } | |
653 | ||
00977a59 | 654 | static const struct file_operations proc_mem_operations = { |
1da177e4 LT |
655 | .llseek = mem_lseek, |
656 | .read = mem_read, | |
657 | .write = mem_write, | |
658 | .open = mem_open, | |
659 | }; | |
660 | ||
661 | static ssize_t oom_adjust_read(struct file *file, char __user *buf, | |
662 | size_t count, loff_t *ppos) | |
663 | { | |
2fddfeef | 664 | struct task_struct *task = get_proc_task(file->f_path.dentry->d_inode); |
8578cea7 | 665 | char buffer[PROC_NUMBUF]; |
1da177e4 | 666 | size_t len; |
99f89551 | 667 | int oom_adjust; |
1da177e4 | 668 | |
99f89551 EB |
669 | if (!task) |
670 | return -ESRCH; | |
671 | oom_adjust = task->oomkilladj; | |
672 | put_task_struct(task); | |
673 | ||
8578cea7 | 674 | len = snprintf(buffer, sizeof(buffer), "%i\n", oom_adjust); |
0c28f287 AM |
675 | |
676 | return simple_read_from_buffer(buf, count, ppos, buffer, len); | |
1da177e4 LT |
677 | } |
678 | ||
679 | static ssize_t oom_adjust_write(struct file *file, const char __user *buf, | |
680 | size_t count, loff_t *ppos) | |
681 | { | |
99f89551 | 682 | struct task_struct *task; |
8578cea7 | 683 | char buffer[PROC_NUMBUF], *end; |
1da177e4 LT |
684 | int oom_adjust; |
685 | ||
8578cea7 EB |
686 | memset(buffer, 0, sizeof(buffer)); |
687 | if (count > sizeof(buffer) - 1) | |
688 | count = sizeof(buffer) - 1; | |
1da177e4 LT |
689 | if (copy_from_user(buffer, buf, count)) |
690 | return -EFAULT; | |
691 | oom_adjust = simple_strtol(buffer, &end, 0); | |
8ac773b4 AD |
692 | if ((oom_adjust < OOM_ADJUST_MIN || oom_adjust > OOM_ADJUST_MAX) && |
693 | oom_adjust != OOM_DISABLE) | |
1da177e4 LT |
694 | return -EINVAL; |
695 | if (*end == '\n') | |
696 | end++; | |
2fddfeef | 697 | task = get_proc_task(file->f_path.dentry->d_inode); |
99f89551 EB |
698 | if (!task) |
699 | return -ESRCH; | |
8fb4fc68 GJ |
700 | if (oom_adjust < task->oomkilladj && !capable(CAP_SYS_RESOURCE)) { |
701 | put_task_struct(task); | |
702 | return -EACCES; | |
703 | } | |
1da177e4 | 704 | task->oomkilladj = oom_adjust; |
99f89551 | 705 | put_task_struct(task); |
1da177e4 LT |
706 | if (end - buffer == 0) |
707 | return -EIO; | |
708 | return end - buffer; | |
709 | } | |
710 | ||
00977a59 | 711 | static const struct file_operations proc_oom_adjust_operations = { |
1da177e4 LT |
712 | .read = oom_adjust_read, |
713 | .write = oom_adjust_write, | |
714 | }; | |
715 | ||
4b8df891 | 716 | #ifdef CONFIG_MMU |
b813e931 DR |
717 | static ssize_t clear_refs_write(struct file *file, const char __user *buf, |
718 | size_t count, loff_t *ppos) | |
719 | { | |
720 | struct task_struct *task; | |
721 | char buffer[PROC_NUMBUF], *end; | |
722 | struct mm_struct *mm; | |
723 | ||
724 | memset(buffer, 0, sizeof(buffer)); | |
725 | if (count > sizeof(buffer) - 1) | |
726 | count = sizeof(buffer) - 1; | |
727 | if (copy_from_user(buffer, buf, count)) | |
728 | return -EFAULT; | |
729 | if (!simple_strtol(buffer, &end, 0)) | |
730 | return -EINVAL; | |
731 | if (*end == '\n') | |
732 | end++; | |
733 | task = get_proc_task(file->f_path.dentry->d_inode); | |
734 | if (!task) | |
735 | return -ESRCH; | |
736 | mm = get_task_mm(task); | |
737 | if (mm) { | |
738 | clear_refs_smap(mm); | |
739 | mmput(mm); | |
740 | } | |
741 | put_task_struct(task); | |
742 | if (end - buffer == 0) | |
743 | return -EIO; | |
744 | return end - buffer; | |
745 | } | |
746 | ||
747 | static struct file_operations proc_clear_refs_operations = { | |
748 | .write = clear_refs_write, | |
749 | }; | |
4b8df891 | 750 | #endif |
b813e931 | 751 | |
1da177e4 LT |
752 | #ifdef CONFIG_AUDITSYSCALL |
753 | #define TMPBUFLEN 21 | |
754 | static ssize_t proc_loginuid_read(struct file * file, char __user * buf, | |
755 | size_t count, loff_t *ppos) | |
756 | { | |
2fddfeef | 757 | struct inode * inode = file->f_path.dentry->d_inode; |
99f89551 | 758 | struct task_struct *task = get_proc_task(inode); |
1da177e4 LT |
759 | ssize_t length; |
760 | char tmpbuf[TMPBUFLEN]; | |
761 | ||
99f89551 EB |
762 | if (!task) |
763 | return -ESRCH; | |
1da177e4 LT |
764 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", |
765 | audit_get_loginuid(task->audit_context)); | |
99f89551 | 766 | put_task_struct(task); |
1da177e4 LT |
767 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); |
768 | } | |
769 | ||
770 | static ssize_t proc_loginuid_write(struct file * file, const char __user * buf, | |
771 | size_t count, loff_t *ppos) | |
772 | { | |
2fddfeef | 773 | struct inode * inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
774 | char *page, *tmp; |
775 | ssize_t length; | |
1da177e4 LT |
776 | uid_t loginuid; |
777 | ||
778 | if (!capable(CAP_AUDIT_CONTROL)) | |
779 | return -EPERM; | |
780 | ||
13b41b09 | 781 | if (current != pid_task(proc_pid(inode), PIDTYPE_PID)) |
1da177e4 LT |
782 | return -EPERM; |
783 | ||
e0182909 AV |
784 | if (count >= PAGE_SIZE) |
785 | count = PAGE_SIZE - 1; | |
1da177e4 LT |
786 | |
787 | if (*ppos != 0) { | |
788 | /* No partial writes. */ | |
789 | return -EINVAL; | |
790 | } | |
e12ba74d | 791 | page = (char*)__get_free_page(GFP_TEMPORARY); |
1da177e4 LT |
792 | if (!page) |
793 | return -ENOMEM; | |
794 | length = -EFAULT; | |
795 | if (copy_from_user(page, buf, count)) | |
796 | goto out_free_page; | |
797 | ||
e0182909 | 798 | page[count] = '\0'; |
1da177e4 LT |
799 | loginuid = simple_strtoul(page, &tmp, 10); |
800 | if (tmp == page) { | |
801 | length = -EINVAL; | |
802 | goto out_free_page; | |
803 | ||
804 | } | |
99f89551 | 805 | length = audit_set_loginuid(current, loginuid); |
1da177e4 LT |
806 | if (likely(length == 0)) |
807 | length = count; | |
808 | ||
809 | out_free_page: | |
810 | free_page((unsigned long) page); | |
811 | return length; | |
812 | } | |
813 | ||
00977a59 | 814 | static const struct file_operations proc_loginuid_operations = { |
1da177e4 LT |
815 | .read = proc_loginuid_read, |
816 | .write = proc_loginuid_write, | |
817 | }; | |
818 | #endif | |
819 | ||
f4f154fd AM |
820 | #ifdef CONFIG_FAULT_INJECTION |
821 | static ssize_t proc_fault_inject_read(struct file * file, char __user * buf, | |
822 | size_t count, loff_t *ppos) | |
823 | { | |
824 | struct task_struct *task = get_proc_task(file->f_dentry->d_inode); | |
825 | char buffer[PROC_NUMBUF]; | |
826 | size_t len; | |
827 | int make_it_fail; | |
f4f154fd AM |
828 | |
829 | if (!task) | |
830 | return -ESRCH; | |
831 | make_it_fail = task->make_it_fail; | |
832 | put_task_struct(task); | |
833 | ||
834 | len = snprintf(buffer, sizeof(buffer), "%i\n", make_it_fail); | |
0c28f287 AM |
835 | |
836 | return simple_read_from_buffer(buf, count, ppos, buffer, len); | |
f4f154fd AM |
837 | } |
838 | ||
839 | static ssize_t proc_fault_inject_write(struct file * file, | |
840 | const char __user * buf, size_t count, loff_t *ppos) | |
841 | { | |
842 | struct task_struct *task; | |
843 | char buffer[PROC_NUMBUF], *end; | |
844 | int make_it_fail; | |
845 | ||
846 | if (!capable(CAP_SYS_RESOURCE)) | |
847 | return -EPERM; | |
848 | memset(buffer, 0, sizeof(buffer)); | |
849 | if (count > sizeof(buffer) - 1) | |
850 | count = sizeof(buffer) - 1; | |
851 | if (copy_from_user(buffer, buf, count)) | |
852 | return -EFAULT; | |
853 | make_it_fail = simple_strtol(buffer, &end, 0); | |
854 | if (*end == '\n') | |
855 | end++; | |
856 | task = get_proc_task(file->f_dentry->d_inode); | |
857 | if (!task) | |
858 | return -ESRCH; | |
859 | task->make_it_fail = make_it_fail; | |
860 | put_task_struct(task); | |
861 | if (end - buffer == 0) | |
862 | return -EIO; | |
863 | return end - buffer; | |
864 | } | |
865 | ||
00977a59 | 866 | static const struct file_operations proc_fault_inject_operations = { |
f4f154fd AM |
867 | .read = proc_fault_inject_read, |
868 | .write = proc_fault_inject_write, | |
869 | }; | |
870 | #endif | |
871 | ||
43ae34cb IM |
872 | #ifdef CONFIG_SCHED_DEBUG |
873 | /* | |
874 | * Print out various scheduling related per-task fields: | |
875 | */ | |
876 | static int sched_show(struct seq_file *m, void *v) | |
877 | { | |
878 | struct inode *inode = m->private; | |
879 | struct task_struct *p; | |
880 | ||
881 | WARN_ON(!inode); | |
882 | ||
883 | p = get_proc_task(inode); | |
884 | if (!p) | |
885 | return -ESRCH; | |
886 | proc_sched_show_task(p, m); | |
887 | ||
888 | put_task_struct(p); | |
889 | ||
890 | return 0; | |
891 | } | |
892 | ||
893 | static ssize_t | |
894 | sched_write(struct file *file, const char __user *buf, | |
895 | size_t count, loff_t *offset) | |
896 | { | |
897 | struct inode *inode = file->f_path.dentry->d_inode; | |
898 | struct task_struct *p; | |
899 | ||
900 | WARN_ON(!inode); | |
901 | ||
902 | p = get_proc_task(inode); | |
903 | if (!p) | |
904 | return -ESRCH; | |
905 | proc_sched_set_task(p); | |
906 | ||
907 | put_task_struct(p); | |
908 | ||
909 | return count; | |
910 | } | |
911 | ||
912 | static int sched_open(struct inode *inode, struct file *filp) | |
913 | { | |
914 | int ret; | |
915 | ||
916 | ret = single_open(filp, sched_show, NULL); | |
917 | if (!ret) { | |
918 | struct seq_file *m = filp->private_data; | |
919 | ||
920 | m->private = inode; | |
921 | } | |
922 | return ret; | |
923 | } | |
924 | ||
925 | static const struct file_operations proc_pid_sched_operations = { | |
926 | .open = sched_open, | |
927 | .read = seq_read, | |
928 | .write = sched_write, | |
929 | .llseek = seq_lseek, | |
5ea473a1 | 930 | .release = single_release, |
43ae34cb IM |
931 | }; |
932 | ||
933 | #endif | |
934 | ||
008b150a | 935 | static void *proc_pid_follow_link(struct dentry *dentry, struct nameidata *nd) |
1da177e4 LT |
936 | { |
937 | struct inode *inode = dentry->d_inode; | |
938 | int error = -EACCES; | |
939 | ||
940 | /* We don't need a base pointer in the /proc filesystem */ | |
941 | path_release(nd); | |
942 | ||
778c1144 EB |
943 | /* Are we allowed to snoop on the tasks file descriptors? */ |
944 | if (!proc_fd_access_allowed(inode)) | |
1da177e4 | 945 | goto out; |
1da177e4 LT |
946 | |
947 | error = PROC_I(inode)->op.proc_get_link(inode, &nd->dentry, &nd->mnt); | |
948 | nd->last_type = LAST_BIND; | |
949 | out: | |
008b150a | 950 | return ERR_PTR(error); |
1da177e4 LT |
951 | } |
952 | ||
953 | static int do_proc_readlink(struct dentry *dentry, struct vfsmount *mnt, | |
954 | char __user *buffer, int buflen) | |
955 | { | |
956 | struct inode * inode; | |
e12ba74d MG |
957 | char *tmp = (char*)__get_free_page(GFP_TEMPORARY); |
958 | char *path; | |
1da177e4 LT |
959 | int len; |
960 | ||
961 | if (!tmp) | |
962 | return -ENOMEM; | |
0c28f287 | 963 | |
1da177e4 LT |
964 | inode = dentry->d_inode; |
965 | path = d_path(dentry, mnt, tmp, PAGE_SIZE); | |
966 | len = PTR_ERR(path); | |
967 | if (IS_ERR(path)) | |
968 | goto out; | |
969 | len = tmp + PAGE_SIZE - 1 - path; | |
970 | ||
971 | if (len > buflen) | |
972 | len = buflen; | |
973 | if (copy_to_user(buffer, path, len)) | |
974 | len = -EFAULT; | |
975 | out: | |
976 | free_page((unsigned long)tmp); | |
977 | return len; | |
978 | } | |
979 | ||
980 | static int proc_pid_readlink(struct dentry * dentry, char __user * buffer, int buflen) | |
981 | { | |
982 | int error = -EACCES; | |
983 | struct inode *inode = dentry->d_inode; | |
984 | struct dentry *de; | |
985 | struct vfsmount *mnt = NULL; | |
986 | ||
778c1144 EB |
987 | /* Are we allowed to snoop on the tasks file descriptors? */ |
988 | if (!proc_fd_access_allowed(inode)) | |
1da177e4 | 989 | goto out; |
1da177e4 LT |
990 | |
991 | error = PROC_I(inode)->op.proc_get_link(inode, &de, &mnt); | |
992 | if (error) | |
993 | goto out; | |
994 | ||
995 | error = do_proc_readlink(de, mnt, buffer, buflen); | |
996 | dput(de); | |
997 | mntput(mnt); | |
998 | out: | |
1da177e4 LT |
999 | return error; |
1000 | } | |
1001 | ||
c5ef1c42 | 1002 | static const struct inode_operations proc_pid_link_inode_operations = { |
1da177e4 | 1003 | .readlink = proc_pid_readlink, |
6d76fa58 LT |
1004 | .follow_link = proc_pid_follow_link, |
1005 | .setattr = proc_setattr, | |
1da177e4 LT |
1006 | }; |
1007 | ||
28a6d671 EB |
1008 | |
1009 | /* building an inode */ | |
1010 | ||
1011 | static int task_dumpable(struct task_struct *task) | |
1da177e4 | 1012 | { |
28a6d671 EB |
1013 | int dumpable = 0; |
1014 | struct mm_struct *mm; | |
1da177e4 | 1015 | |
28a6d671 EB |
1016 | task_lock(task); |
1017 | mm = task->mm; | |
1018 | if (mm) | |
6c5d5238 | 1019 | dumpable = get_dumpable(mm); |
28a6d671 EB |
1020 | task_unlock(task); |
1021 | if(dumpable == 1) | |
1022 | return 1; | |
1023 | return 0; | |
1024 | } | |
1da177e4 | 1025 | |
1da177e4 | 1026 | |
61a28784 | 1027 | static struct inode *proc_pid_make_inode(struct super_block * sb, struct task_struct *task) |
28a6d671 EB |
1028 | { |
1029 | struct inode * inode; | |
1030 | struct proc_inode *ei; | |
1da177e4 | 1031 | |
28a6d671 | 1032 | /* We need a new inode */ |
1da177e4 | 1033 | |
28a6d671 EB |
1034 | inode = new_inode(sb); |
1035 | if (!inode) | |
1036 | goto out; | |
1037 | ||
1038 | /* Common stuff */ | |
1039 | ei = PROC_I(inode); | |
1040 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; | |
28a6d671 EB |
1041 | inode->i_op = &proc_def_inode_operations; |
1042 | ||
1043 | /* | |
1044 | * grab the reference to task. | |
1045 | */ | |
1a657f78 | 1046 | ei->pid = get_task_pid(task, PIDTYPE_PID); |
28a6d671 EB |
1047 | if (!ei->pid) |
1048 | goto out_unlock; | |
1049 | ||
1050 | inode->i_uid = 0; | |
1051 | inode->i_gid = 0; | |
1052 | if (task_dumpable(task)) { | |
1053 | inode->i_uid = task->euid; | |
1054 | inode->i_gid = task->egid; | |
1da177e4 | 1055 | } |
28a6d671 EB |
1056 | security_task_to_inode(task, inode); |
1057 | ||
1da177e4 | 1058 | out: |
28a6d671 EB |
1059 | return inode; |
1060 | ||
1061 | out_unlock: | |
1062 | iput(inode); | |
1063 | return NULL; | |
1da177e4 LT |
1064 | } |
1065 | ||
28a6d671 | 1066 | static int pid_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) |
1da177e4 | 1067 | { |
1da177e4 | 1068 | struct inode *inode = dentry->d_inode; |
28a6d671 EB |
1069 | struct task_struct *task; |
1070 | generic_fillattr(inode, stat); | |
1da177e4 | 1071 | |
28a6d671 EB |
1072 | rcu_read_lock(); |
1073 | stat->uid = 0; | |
1074 | stat->gid = 0; | |
1075 | task = pid_task(proc_pid(inode), PIDTYPE_PID); | |
1076 | if (task) { | |
1077 | if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) || | |
1078 | task_dumpable(task)) { | |
1079 | stat->uid = task->euid; | |
1080 | stat->gid = task->egid; | |
1da177e4 LT |
1081 | } |
1082 | } | |
28a6d671 | 1083 | rcu_read_unlock(); |
d6e71144 | 1084 | return 0; |
1da177e4 LT |
1085 | } |
1086 | ||
1da177e4 LT |
1087 | /* dentry stuff */ |
1088 | ||
1089 | /* | |
1090 | * Exceptional case: normally we are not allowed to unhash a busy | |
1091 | * directory. In this case, however, we can do it - no aliasing problems | |
1092 | * due to the way we treat inodes. | |
1093 | * | |
1094 | * Rewrite the inode's ownerships here because the owning task may have | |
1095 | * performed a setuid(), etc. | |
99f89551 EB |
1096 | * |
1097 | * Before the /proc/pid/status file was created the only way to read | |
1098 | * the effective uid of a /process was to stat /proc/pid. Reading | |
1099 | * /proc/pid/status is slow enough that procps and other packages | |
1100 | * kept stating /proc/pid. To keep the rules in /proc simple I have | |
1101 | * made this apply to all per process world readable and executable | |
1102 | * directories. | |
1da177e4 LT |
1103 | */ |
1104 | static int pid_revalidate(struct dentry *dentry, struct nameidata *nd) | |
1105 | { | |
1106 | struct inode *inode = dentry->d_inode; | |
99f89551 EB |
1107 | struct task_struct *task = get_proc_task(inode); |
1108 | if (task) { | |
1109 | if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) || | |
1110 | task_dumpable(task)) { | |
1da177e4 LT |
1111 | inode->i_uid = task->euid; |
1112 | inode->i_gid = task->egid; | |
1113 | } else { | |
1114 | inode->i_uid = 0; | |
1115 | inode->i_gid = 0; | |
1116 | } | |
9ee8ab9f | 1117 | inode->i_mode &= ~(S_ISUID | S_ISGID); |
1da177e4 | 1118 | security_task_to_inode(task, inode); |
99f89551 | 1119 | put_task_struct(task); |
1da177e4 LT |
1120 | return 1; |
1121 | } | |
1122 | d_drop(dentry); | |
1123 | return 0; | |
1124 | } | |
1125 | ||
28a6d671 | 1126 | static int pid_delete_dentry(struct dentry * dentry) |
99f89551 | 1127 | { |
28a6d671 EB |
1128 | /* Is the task we represent dead? |
1129 | * If so, then don't put the dentry on the lru list, | |
1130 | * kill it immediately. | |
1131 | */ | |
1132 | return !proc_pid(dentry->d_inode)->tasks[PIDTYPE_PID].first; | |
1133 | } | |
1134 | ||
1135 | static struct dentry_operations pid_dentry_operations = | |
1136 | { | |
1137 | .d_revalidate = pid_revalidate, | |
1138 | .d_delete = pid_delete_dentry, | |
1139 | }; | |
1140 | ||
1141 | /* Lookups */ | |
1142 | ||
c5141e6d ED |
1143 | typedef struct dentry *instantiate_t(struct inode *, struct dentry *, |
1144 | struct task_struct *, const void *); | |
61a28784 | 1145 | |
1c0d04c9 EB |
1146 | /* |
1147 | * Fill a directory entry. | |
1148 | * | |
1149 | * If possible create the dcache entry and derive our inode number and | |
1150 | * file type from dcache entry. | |
1151 | * | |
1152 | * Since all of the proc inode numbers are dynamically generated, the inode | |
1153 | * numbers do not exist until the inode is cache. This means creating the | |
1154 | * the dcache entry in readdir is necessary to keep the inode numbers | |
1155 | * reported by readdir in sync with the inode numbers reported | |
1156 | * by stat. | |
1157 | */ | |
61a28784 EB |
1158 | static int proc_fill_cache(struct file *filp, void *dirent, filldir_t filldir, |
1159 | char *name, int len, | |
c5141e6d | 1160 | instantiate_t instantiate, struct task_struct *task, const void *ptr) |
61a28784 | 1161 | { |
2fddfeef | 1162 | struct dentry *child, *dir = filp->f_path.dentry; |
61a28784 EB |
1163 | struct inode *inode; |
1164 | struct qstr qname; | |
1165 | ino_t ino = 0; | |
1166 | unsigned type = DT_UNKNOWN; | |
1167 | ||
1168 | qname.name = name; | |
1169 | qname.len = len; | |
1170 | qname.hash = full_name_hash(name, len); | |
1171 | ||
1172 | child = d_lookup(dir, &qname); | |
1173 | if (!child) { | |
1174 | struct dentry *new; | |
1175 | new = d_alloc(dir, &qname); | |
1176 | if (new) { | |
1177 | child = instantiate(dir->d_inode, new, task, ptr); | |
1178 | if (child) | |
1179 | dput(new); | |
1180 | else | |
1181 | child = new; | |
1182 | } | |
1183 | } | |
1184 | if (!child || IS_ERR(child) || !child->d_inode) | |
1185 | goto end_instantiate; | |
1186 | inode = child->d_inode; | |
1187 | if (inode) { | |
1188 | ino = inode->i_ino; | |
1189 | type = inode->i_mode >> 12; | |
1190 | } | |
1191 | dput(child); | |
1192 | end_instantiate: | |
1193 | if (!ino) | |
1194 | ino = find_inode_number(dir, &qname); | |
1195 | if (!ino) | |
1196 | ino = 1; | |
1197 | return filldir(dirent, name, len, filp->f_pos, ino, type); | |
1198 | } | |
1199 | ||
28a6d671 EB |
1200 | static unsigned name_to_int(struct dentry *dentry) |
1201 | { | |
1202 | const char *name = dentry->d_name.name; | |
1203 | int len = dentry->d_name.len; | |
1204 | unsigned n = 0; | |
1205 | ||
1206 | if (len > 1 && *name == '0') | |
1207 | goto out; | |
1208 | while (len-- > 0) { | |
1209 | unsigned c = *name++ - '0'; | |
1210 | if (c > 9) | |
1211 | goto out; | |
1212 | if (n >= (~0U-9)/10) | |
1213 | goto out; | |
1214 | n *= 10; | |
1215 | n += c; | |
1216 | } | |
1217 | return n; | |
1218 | out: | |
1219 | return ~0U; | |
1220 | } | |
1221 | ||
27932742 MS |
1222 | #define PROC_FDINFO_MAX 64 |
1223 | ||
1224 | static int proc_fd_info(struct inode *inode, struct dentry **dentry, | |
1225 | struct vfsmount **mnt, char *info) | |
28a6d671 EB |
1226 | { |
1227 | struct task_struct *task = get_proc_task(inode); | |
1228 | struct files_struct *files = NULL; | |
1229 | struct file *file; | |
1230 | int fd = proc_fd(inode); | |
99f89551 | 1231 | |
99f89551 | 1232 | if (task) { |
28a6d671 EB |
1233 | files = get_files_struct(task); |
1234 | put_task_struct(task); | |
1235 | } | |
1236 | if (files) { | |
1237 | /* | |
1238 | * We are not taking a ref to the file structure, so we must | |
1239 | * hold ->file_lock. | |
1240 | */ | |
1241 | spin_lock(&files->file_lock); | |
1242 | file = fcheck_files(files, fd); | |
1243 | if (file) { | |
27932742 MS |
1244 | if (mnt) |
1245 | *mnt = mntget(file->f_path.mnt); | |
1246 | if (dentry) | |
1247 | *dentry = dget(file->f_path.dentry); | |
1248 | if (info) | |
1249 | snprintf(info, PROC_FDINFO_MAX, | |
1250 | "pos:\t%lli\n" | |
1251 | "flags:\t0%o\n", | |
1252 | (long long) file->f_pos, | |
1253 | file->f_flags); | |
28a6d671 EB |
1254 | spin_unlock(&files->file_lock); |
1255 | put_files_struct(files); | |
1256 | return 0; | |
99f89551 | 1257 | } |
28a6d671 EB |
1258 | spin_unlock(&files->file_lock); |
1259 | put_files_struct(files); | |
99f89551 | 1260 | } |
28a6d671 | 1261 | return -ENOENT; |
99f89551 EB |
1262 | } |
1263 | ||
27932742 MS |
1264 | static int proc_fd_link(struct inode *inode, struct dentry **dentry, |
1265 | struct vfsmount **mnt) | |
1266 | { | |
1267 | return proc_fd_info(inode, dentry, mnt, NULL); | |
1268 | } | |
1269 | ||
1da177e4 LT |
1270 | static int tid_fd_revalidate(struct dentry *dentry, struct nameidata *nd) |
1271 | { | |
1272 | struct inode *inode = dentry->d_inode; | |
99f89551 | 1273 | struct task_struct *task = get_proc_task(inode); |
aed7a6c4 | 1274 | int fd = proc_fd(inode); |
1da177e4 LT |
1275 | struct files_struct *files; |
1276 | ||
99f89551 EB |
1277 | if (task) { |
1278 | files = get_files_struct(task); | |
1279 | if (files) { | |
1280 | rcu_read_lock(); | |
1281 | if (fcheck_files(files, fd)) { | |
1282 | rcu_read_unlock(); | |
1283 | put_files_struct(files); | |
1284 | if (task_dumpable(task)) { | |
1285 | inode->i_uid = task->euid; | |
1286 | inode->i_gid = task->egid; | |
1287 | } else { | |
1288 | inode->i_uid = 0; | |
1289 | inode->i_gid = 0; | |
1290 | } | |
9ee8ab9f | 1291 | inode->i_mode &= ~(S_ISUID | S_ISGID); |
99f89551 EB |
1292 | security_task_to_inode(task, inode); |
1293 | put_task_struct(task); | |
1294 | return 1; | |
1295 | } | |
b835996f | 1296 | rcu_read_unlock(); |
1da177e4 | 1297 | put_files_struct(files); |
1da177e4 | 1298 | } |
99f89551 | 1299 | put_task_struct(task); |
1da177e4 LT |
1300 | } |
1301 | d_drop(dentry); | |
1302 | return 0; | |
1303 | } | |
1304 | ||
1da177e4 LT |
1305 | static struct dentry_operations tid_fd_dentry_operations = |
1306 | { | |
1307 | .d_revalidate = tid_fd_revalidate, | |
1308 | .d_delete = pid_delete_dentry, | |
1309 | }; | |
1310 | ||
444ceed8 | 1311 | static struct dentry *proc_fd_instantiate(struct inode *dir, |
c5141e6d | 1312 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
1da177e4 | 1313 | { |
c5141e6d | 1314 | unsigned fd = *(const unsigned *)ptr; |
444ceed8 EB |
1315 | struct file *file; |
1316 | struct files_struct *files; | |
1317 | struct inode *inode; | |
1318 | struct proc_inode *ei; | |
1319 | struct dentry *error = ERR_PTR(-ENOENT); | |
1da177e4 | 1320 | |
61a28784 | 1321 | inode = proc_pid_make_inode(dir->i_sb, task); |
1da177e4 LT |
1322 | if (!inode) |
1323 | goto out; | |
1324 | ei = PROC_I(inode); | |
aed7a6c4 | 1325 | ei->fd = fd; |
1da177e4 LT |
1326 | files = get_files_struct(task); |
1327 | if (!files) | |
444ceed8 | 1328 | goto out_iput; |
1da177e4 | 1329 | inode->i_mode = S_IFLNK; |
ca99c1da DS |
1330 | |
1331 | /* | |
1332 | * We are not taking a ref to the file structure, so we must | |
1333 | * hold ->file_lock. | |
1334 | */ | |
1335 | spin_lock(&files->file_lock); | |
1da177e4 LT |
1336 | file = fcheck_files(files, fd); |
1337 | if (!file) | |
444ceed8 | 1338 | goto out_unlock; |
1da177e4 LT |
1339 | if (file->f_mode & 1) |
1340 | inode->i_mode |= S_IRUSR | S_IXUSR; | |
1341 | if (file->f_mode & 2) | |
1342 | inode->i_mode |= S_IWUSR | S_IXUSR; | |
ca99c1da | 1343 | spin_unlock(&files->file_lock); |
1da177e4 | 1344 | put_files_struct(files); |
444ceed8 | 1345 | |
1da177e4 LT |
1346 | inode->i_op = &proc_pid_link_inode_operations; |
1347 | inode->i_size = 64; | |
1348 | ei->op.proc_get_link = proc_fd_link; | |
1349 | dentry->d_op = &tid_fd_dentry_operations; | |
1350 | d_add(dentry, inode); | |
cd6a3ce9 EB |
1351 | /* Close the race of the process dying before we return the dentry */ |
1352 | if (tid_fd_revalidate(dentry, NULL)) | |
444ceed8 | 1353 | error = NULL; |
1da177e4 | 1354 | |
444ceed8 EB |
1355 | out: |
1356 | return error; | |
1357 | out_unlock: | |
ca99c1da | 1358 | spin_unlock(&files->file_lock); |
1da177e4 | 1359 | put_files_struct(files); |
444ceed8 | 1360 | out_iput: |
1da177e4 | 1361 | iput(inode); |
cd6a3ce9 | 1362 | goto out; |
1da177e4 LT |
1363 | } |
1364 | ||
27932742 MS |
1365 | static struct dentry *proc_lookupfd_common(struct inode *dir, |
1366 | struct dentry *dentry, | |
1367 | instantiate_t instantiate) | |
444ceed8 EB |
1368 | { |
1369 | struct task_struct *task = get_proc_task(dir); | |
1370 | unsigned fd = name_to_int(dentry); | |
1371 | struct dentry *result = ERR_PTR(-ENOENT); | |
1372 | ||
1373 | if (!task) | |
1374 | goto out_no_task; | |
1375 | if (fd == ~0U) | |
1376 | goto out; | |
1377 | ||
27932742 | 1378 | result = instantiate(dir, dentry, task, &fd); |
444ceed8 EB |
1379 | out: |
1380 | put_task_struct(task); | |
1381 | out_no_task: | |
1382 | return result; | |
1383 | } | |
1384 | ||
27932742 MS |
1385 | static int proc_readfd_common(struct file * filp, void * dirent, |
1386 | filldir_t filldir, instantiate_t instantiate) | |
28a6d671 | 1387 | { |
2fddfeef | 1388 | struct dentry *dentry = filp->f_path.dentry; |
28a6d671 EB |
1389 | struct inode *inode = dentry->d_inode; |
1390 | struct task_struct *p = get_proc_task(inode); | |
1391 | unsigned int fd, tid, ino; | |
1392 | int retval; | |
28a6d671 EB |
1393 | struct files_struct * files; |
1394 | struct fdtable *fdt; | |
1da177e4 | 1395 | |
28a6d671 EB |
1396 | retval = -ENOENT; |
1397 | if (!p) | |
1398 | goto out_no_task; | |
1399 | retval = 0; | |
1400 | tid = p->pid; | |
1401 | ||
1402 | fd = filp->f_pos; | |
1403 | switch (fd) { | |
1404 | case 0: | |
1405 | if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0) | |
1406 | goto out; | |
1407 | filp->f_pos++; | |
1408 | case 1: | |
1409 | ino = parent_ino(dentry); | |
1410 | if (filldir(dirent, "..", 2, 1, ino, DT_DIR) < 0) | |
1411 | goto out; | |
1412 | filp->f_pos++; | |
1413 | default: | |
1414 | files = get_files_struct(p); | |
1415 | if (!files) | |
1416 | goto out; | |
1417 | rcu_read_lock(); | |
1418 | fdt = files_fdtable(files); | |
1419 | for (fd = filp->f_pos-2; | |
1420 | fd < fdt->max_fds; | |
1421 | fd++, filp->f_pos++) { | |
27932742 MS |
1422 | char name[PROC_NUMBUF]; |
1423 | int len; | |
28a6d671 EB |
1424 | |
1425 | if (!fcheck_files(files, fd)) | |
1426 | continue; | |
1427 | rcu_read_unlock(); | |
1428 | ||
27932742 MS |
1429 | len = snprintf(name, sizeof(name), "%d", fd); |
1430 | if (proc_fill_cache(filp, dirent, filldir, | |
1431 | name, len, instantiate, | |
1432 | p, &fd) < 0) { | |
28a6d671 EB |
1433 | rcu_read_lock(); |
1434 | break; | |
1435 | } | |
1436 | rcu_read_lock(); | |
1437 | } | |
1438 | rcu_read_unlock(); | |
1439 | put_files_struct(files); | |
1440 | } | |
1441 | out: | |
1442 | put_task_struct(p); | |
1443 | out_no_task: | |
1444 | return retval; | |
1445 | } | |
1446 | ||
27932742 MS |
1447 | static struct dentry *proc_lookupfd(struct inode *dir, struct dentry *dentry, |
1448 | struct nameidata *nd) | |
1449 | { | |
1450 | return proc_lookupfd_common(dir, dentry, proc_fd_instantiate); | |
1451 | } | |
1452 | ||
1453 | static int proc_readfd(struct file *filp, void *dirent, filldir_t filldir) | |
1454 | { | |
1455 | return proc_readfd_common(filp, dirent, filldir, proc_fd_instantiate); | |
1456 | } | |
1457 | ||
1458 | static ssize_t proc_fdinfo_read(struct file *file, char __user *buf, | |
1459 | size_t len, loff_t *ppos) | |
1460 | { | |
1461 | char tmp[PROC_FDINFO_MAX]; | |
1462 | int err = proc_fd_info(file->f_path.dentry->d_inode, NULL, NULL, tmp); | |
1463 | if (!err) | |
1464 | err = simple_read_from_buffer(buf, len, ppos, tmp, strlen(tmp)); | |
1465 | return err; | |
1466 | } | |
1467 | ||
1468 | static const struct file_operations proc_fdinfo_file_operations = { | |
1469 | .open = nonseekable_open, | |
1470 | .read = proc_fdinfo_read, | |
1471 | }; | |
1472 | ||
00977a59 | 1473 | static const struct file_operations proc_fd_operations = { |
28a6d671 EB |
1474 | .read = generic_read_dir, |
1475 | .readdir = proc_readfd, | |
1da177e4 LT |
1476 | }; |
1477 | ||
8948e11f AD |
1478 | /* |
1479 | * /proc/pid/fd needs a special permission handler so that a process can still | |
1480 | * access /proc/self/fd after it has executed a setuid(). | |
1481 | */ | |
1482 | static int proc_fd_permission(struct inode *inode, int mask, | |
1483 | struct nameidata *nd) | |
1484 | { | |
1485 | int rv; | |
1486 | ||
1487 | rv = generic_permission(inode, mask, NULL); | |
1488 | if (rv == 0) | |
1489 | return 0; | |
1490 | if (task_pid(current) == proc_pid(inode)) | |
1491 | rv = 0; | |
1492 | return rv; | |
1493 | } | |
1494 | ||
1da177e4 LT |
1495 | /* |
1496 | * proc directories can do almost nothing.. | |
1497 | */ | |
c5ef1c42 | 1498 | static const struct inode_operations proc_fd_inode_operations = { |
1da177e4 | 1499 | .lookup = proc_lookupfd, |
8948e11f | 1500 | .permission = proc_fd_permission, |
6d76fa58 | 1501 | .setattr = proc_setattr, |
1da177e4 LT |
1502 | }; |
1503 | ||
27932742 MS |
1504 | static struct dentry *proc_fdinfo_instantiate(struct inode *dir, |
1505 | struct dentry *dentry, struct task_struct *task, const void *ptr) | |
1506 | { | |
1507 | unsigned fd = *(unsigned *)ptr; | |
1508 | struct inode *inode; | |
1509 | struct proc_inode *ei; | |
1510 | struct dentry *error = ERR_PTR(-ENOENT); | |
1511 | ||
1512 | inode = proc_pid_make_inode(dir->i_sb, task); | |
1513 | if (!inode) | |
1514 | goto out; | |
1515 | ei = PROC_I(inode); | |
1516 | ei->fd = fd; | |
1517 | inode->i_mode = S_IFREG | S_IRUSR; | |
1518 | inode->i_fop = &proc_fdinfo_file_operations; | |
1519 | dentry->d_op = &tid_fd_dentry_operations; | |
1520 | d_add(dentry, inode); | |
1521 | /* Close the race of the process dying before we return the dentry */ | |
1522 | if (tid_fd_revalidate(dentry, NULL)) | |
1523 | error = NULL; | |
1524 | ||
1525 | out: | |
1526 | return error; | |
1527 | } | |
1528 | ||
1529 | static struct dentry *proc_lookupfdinfo(struct inode *dir, | |
1530 | struct dentry *dentry, | |
1531 | struct nameidata *nd) | |
1532 | { | |
1533 | return proc_lookupfd_common(dir, dentry, proc_fdinfo_instantiate); | |
1534 | } | |
1535 | ||
1536 | static int proc_readfdinfo(struct file *filp, void *dirent, filldir_t filldir) | |
1537 | { | |
1538 | return proc_readfd_common(filp, dirent, filldir, | |
1539 | proc_fdinfo_instantiate); | |
1540 | } | |
1541 | ||
1542 | static const struct file_operations proc_fdinfo_operations = { | |
1543 | .read = generic_read_dir, | |
1544 | .readdir = proc_readfdinfo, | |
1545 | }; | |
1546 | ||
1547 | /* | |
1548 | * proc directories can do almost nothing.. | |
1549 | */ | |
1550 | static const struct inode_operations proc_fdinfo_inode_operations = { | |
1551 | .lookup = proc_lookupfdinfo, | |
1552 | .setattr = proc_setattr, | |
1553 | }; | |
1554 | ||
1555 | ||
444ceed8 | 1556 | static struct dentry *proc_pident_instantiate(struct inode *dir, |
c5141e6d | 1557 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
444ceed8 | 1558 | { |
c5141e6d | 1559 | const struct pid_entry *p = ptr; |
444ceed8 EB |
1560 | struct inode *inode; |
1561 | struct proc_inode *ei; | |
1562 | struct dentry *error = ERR_PTR(-EINVAL); | |
1563 | ||
61a28784 | 1564 | inode = proc_pid_make_inode(dir->i_sb, task); |
444ceed8 EB |
1565 | if (!inode) |
1566 | goto out; | |
1567 | ||
1568 | ei = PROC_I(inode); | |
1569 | inode->i_mode = p->mode; | |
1570 | if (S_ISDIR(inode->i_mode)) | |
1571 | inode->i_nlink = 2; /* Use getattr to fix if necessary */ | |
1572 | if (p->iop) | |
1573 | inode->i_op = p->iop; | |
1574 | if (p->fop) | |
1575 | inode->i_fop = p->fop; | |
1576 | ei->op = p->op; | |
1577 | dentry->d_op = &pid_dentry_operations; | |
1578 | d_add(dentry, inode); | |
1579 | /* Close the race of the process dying before we return the dentry */ | |
1580 | if (pid_revalidate(dentry, NULL)) | |
1581 | error = NULL; | |
1582 | out: | |
1583 | return error; | |
1584 | } | |
1585 | ||
1da177e4 LT |
1586 | static struct dentry *proc_pident_lookup(struct inode *dir, |
1587 | struct dentry *dentry, | |
c5141e6d | 1588 | const struct pid_entry *ents, |
7bcd6b0e | 1589 | unsigned int nents) |
1da177e4 LT |
1590 | { |
1591 | struct inode *inode; | |
cd6a3ce9 | 1592 | struct dentry *error; |
99f89551 | 1593 | struct task_struct *task = get_proc_task(dir); |
c5141e6d | 1594 | const struct pid_entry *p, *last; |
1da177e4 | 1595 | |
cd6a3ce9 | 1596 | error = ERR_PTR(-ENOENT); |
1da177e4 LT |
1597 | inode = NULL; |
1598 | ||
99f89551 EB |
1599 | if (!task) |
1600 | goto out_no_task; | |
1da177e4 | 1601 | |
20cdc894 EB |
1602 | /* |
1603 | * Yes, it does not scale. And it should not. Don't add | |
1604 | * new entries into /proc/<tgid>/ without very good reasons. | |
1605 | */ | |
7bcd6b0e EB |
1606 | last = &ents[nents - 1]; |
1607 | for (p = ents; p <= last; p++) { | |
1da177e4 LT |
1608 | if (p->len != dentry->d_name.len) |
1609 | continue; | |
1610 | if (!memcmp(dentry->d_name.name, p->name, p->len)) | |
1611 | break; | |
1612 | } | |
7bcd6b0e | 1613 | if (p > last) |
1da177e4 LT |
1614 | goto out; |
1615 | ||
444ceed8 | 1616 | error = proc_pident_instantiate(dir, dentry, task, p); |
1da177e4 | 1617 | out: |
99f89551 EB |
1618 | put_task_struct(task); |
1619 | out_no_task: | |
cd6a3ce9 | 1620 | return error; |
1da177e4 LT |
1621 | } |
1622 | ||
c5141e6d ED |
1623 | static int proc_pident_fill_cache(struct file *filp, void *dirent, |
1624 | filldir_t filldir, struct task_struct *task, const struct pid_entry *p) | |
61a28784 EB |
1625 | { |
1626 | return proc_fill_cache(filp, dirent, filldir, p->name, p->len, | |
1627 | proc_pident_instantiate, task, p); | |
1628 | } | |
1629 | ||
28a6d671 EB |
1630 | static int proc_pident_readdir(struct file *filp, |
1631 | void *dirent, filldir_t filldir, | |
c5141e6d | 1632 | const struct pid_entry *ents, unsigned int nents) |
28a6d671 EB |
1633 | { |
1634 | int i; | |
1635 | int pid; | |
2fddfeef | 1636 | struct dentry *dentry = filp->f_path.dentry; |
28a6d671 EB |
1637 | struct inode *inode = dentry->d_inode; |
1638 | struct task_struct *task = get_proc_task(inode); | |
c5141e6d | 1639 | const struct pid_entry *p, *last; |
28a6d671 EB |
1640 | ino_t ino; |
1641 | int ret; | |
1642 | ||
1643 | ret = -ENOENT; | |
1644 | if (!task) | |
61a28784 | 1645 | goto out_no_task; |
28a6d671 EB |
1646 | |
1647 | ret = 0; | |
1648 | pid = task->pid; | |
28a6d671 EB |
1649 | i = filp->f_pos; |
1650 | switch (i) { | |
1651 | case 0: | |
1652 | ino = inode->i_ino; | |
1653 | if (filldir(dirent, ".", 1, i, ino, DT_DIR) < 0) | |
1654 | goto out; | |
1655 | i++; | |
1656 | filp->f_pos++; | |
1657 | /* fall through */ | |
1658 | case 1: | |
1659 | ino = parent_ino(dentry); | |
1660 | if (filldir(dirent, "..", 2, i, ino, DT_DIR) < 0) | |
1661 | goto out; | |
1662 | i++; | |
1663 | filp->f_pos++; | |
1664 | /* fall through */ | |
1665 | default: | |
1666 | i -= 2; | |
1667 | if (i >= nents) { | |
1668 | ret = 1; | |
1669 | goto out; | |
1670 | } | |
1671 | p = ents + i; | |
7bcd6b0e EB |
1672 | last = &ents[nents - 1]; |
1673 | while (p <= last) { | |
61a28784 | 1674 | if (proc_pident_fill_cache(filp, dirent, filldir, task, p) < 0) |
28a6d671 EB |
1675 | goto out; |
1676 | filp->f_pos++; | |
1677 | p++; | |
1678 | } | |
1679 | } | |
1680 | ||
1681 | ret = 1; | |
1682 | out: | |
61a28784 EB |
1683 | put_task_struct(task); |
1684 | out_no_task: | |
28a6d671 | 1685 | return ret; |
1da177e4 LT |
1686 | } |
1687 | ||
28a6d671 EB |
1688 | #ifdef CONFIG_SECURITY |
1689 | static ssize_t proc_pid_attr_read(struct file * file, char __user * buf, | |
1690 | size_t count, loff_t *ppos) | |
1691 | { | |
2fddfeef | 1692 | struct inode * inode = file->f_path.dentry->d_inode; |
04ff9708 | 1693 | char *p = NULL; |
28a6d671 EB |
1694 | ssize_t length; |
1695 | struct task_struct *task = get_proc_task(inode); | |
1696 | ||
28a6d671 | 1697 | if (!task) |
04ff9708 | 1698 | return -ESRCH; |
28a6d671 EB |
1699 | |
1700 | length = security_getprocattr(task, | |
2fddfeef | 1701 | (char*)file->f_path.dentry->d_name.name, |
04ff9708 | 1702 | &p); |
28a6d671 | 1703 | put_task_struct(task); |
04ff9708 AV |
1704 | if (length > 0) |
1705 | length = simple_read_from_buffer(buf, count, ppos, p, length); | |
1706 | kfree(p); | |
28a6d671 | 1707 | return length; |
1da177e4 LT |
1708 | } |
1709 | ||
28a6d671 EB |
1710 | static ssize_t proc_pid_attr_write(struct file * file, const char __user * buf, |
1711 | size_t count, loff_t *ppos) | |
1712 | { | |
2fddfeef | 1713 | struct inode * inode = file->f_path.dentry->d_inode; |
28a6d671 EB |
1714 | char *page; |
1715 | ssize_t length; | |
1716 | struct task_struct *task = get_proc_task(inode); | |
1717 | ||
1718 | length = -ESRCH; | |
1719 | if (!task) | |
1720 | goto out_no_task; | |
1721 | if (count > PAGE_SIZE) | |
1722 | count = PAGE_SIZE; | |
1723 | ||
1724 | /* No partial writes. */ | |
1725 | length = -EINVAL; | |
1726 | if (*ppos != 0) | |
1727 | goto out; | |
1728 | ||
1729 | length = -ENOMEM; | |
e12ba74d | 1730 | page = (char*)__get_free_page(GFP_TEMPORARY); |
28a6d671 EB |
1731 | if (!page) |
1732 | goto out; | |
1733 | ||
1734 | length = -EFAULT; | |
1735 | if (copy_from_user(page, buf, count)) | |
1736 | goto out_free; | |
1737 | ||
1738 | length = security_setprocattr(task, | |
2fddfeef | 1739 | (char*)file->f_path.dentry->d_name.name, |
28a6d671 EB |
1740 | (void*)page, count); |
1741 | out_free: | |
1742 | free_page((unsigned long) page); | |
1743 | out: | |
1744 | put_task_struct(task); | |
1745 | out_no_task: | |
1746 | return length; | |
1747 | } | |
1748 | ||
00977a59 | 1749 | static const struct file_operations proc_pid_attr_operations = { |
28a6d671 EB |
1750 | .read = proc_pid_attr_read, |
1751 | .write = proc_pid_attr_write, | |
1752 | }; | |
1753 | ||
c5141e6d | 1754 | static const struct pid_entry attr_dir_stuff[] = { |
61a28784 EB |
1755 | REG("current", S_IRUGO|S_IWUGO, pid_attr), |
1756 | REG("prev", S_IRUGO, pid_attr), | |
1757 | REG("exec", S_IRUGO|S_IWUGO, pid_attr), | |
1758 | REG("fscreate", S_IRUGO|S_IWUGO, pid_attr), | |
1759 | REG("keycreate", S_IRUGO|S_IWUGO, pid_attr), | |
1760 | REG("sockcreate", S_IRUGO|S_IWUGO, pid_attr), | |
28a6d671 EB |
1761 | }; |
1762 | ||
72d9dcfc | 1763 | static int proc_attr_dir_readdir(struct file * filp, |
28a6d671 EB |
1764 | void * dirent, filldir_t filldir) |
1765 | { | |
1766 | return proc_pident_readdir(filp,dirent,filldir, | |
72d9dcfc | 1767 | attr_dir_stuff,ARRAY_SIZE(attr_dir_stuff)); |
28a6d671 EB |
1768 | } |
1769 | ||
00977a59 | 1770 | static const struct file_operations proc_attr_dir_operations = { |
1da177e4 | 1771 | .read = generic_read_dir, |
72d9dcfc | 1772 | .readdir = proc_attr_dir_readdir, |
1da177e4 LT |
1773 | }; |
1774 | ||
72d9dcfc | 1775 | static struct dentry *proc_attr_dir_lookup(struct inode *dir, |
28a6d671 EB |
1776 | struct dentry *dentry, struct nameidata *nd) |
1777 | { | |
7bcd6b0e EB |
1778 | return proc_pident_lookup(dir, dentry, |
1779 | attr_dir_stuff, ARRAY_SIZE(attr_dir_stuff)); | |
28a6d671 EB |
1780 | } |
1781 | ||
c5ef1c42 | 1782 | static const struct inode_operations proc_attr_dir_inode_operations = { |
72d9dcfc | 1783 | .lookup = proc_attr_dir_lookup, |
99f89551 | 1784 | .getattr = pid_getattr, |
6d76fa58 | 1785 | .setattr = proc_setattr, |
1da177e4 LT |
1786 | }; |
1787 | ||
28a6d671 EB |
1788 | #endif |
1789 | ||
3cb4a0bb KH |
1790 | #if defined(USE_ELF_CORE_DUMP) && defined(CONFIG_ELF_CORE) |
1791 | static ssize_t proc_coredump_filter_read(struct file *file, char __user *buf, | |
1792 | size_t count, loff_t *ppos) | |
1793 | { | |
1794 | struct task_struct *task = get_proc_task(file->f_dentry->d_inode); | |
1795 | struct mm_struct *mm; | |
1796 | char buffer[PROC_NUMBUF]; | |
1797 | size_t len; | |
1798 | int ret; | |
1799 | ||
1800 | if (!task) | |
1801 | return -ESRCH; | |
1802 | ||
1803 | ret = 0; | |
1804 | mm = get_task_mm(task); | |
1805 | if (mm) { | |
1806 | len = snprintf(buffer, sizeof(buffer), "%08lx\n", | |
1807 | ((mm->flags & MMF_DUMP_FILTER_MASK) >> | |
1808 | MMF_DUMP_FILTER_SHIFT)); | |
1809 | mmput(mm); | |
1810 | ret = simple_read_from_buffer(buf, count, ppos, buffer, len); | |
1811 | } | |
1812 | ||
1813 | put_task_struct(task); | |
1814 | ||
1815 | return ret; | |
1816 | } | |
1817 | ||
1818 | static ssize_t proc_coredump_filter_write(struct file *file, | |
1819 | const char __user *buf, | |
1820 | size_t count, | |
1821 | loff_t *ppos) | |
1822 | { | |
1823 | struct task_struct *task; | |
1824 | struct mm_struct *mm; | |
1825 | char buffer[PROC_NUMBUF], *end; | |
1826 | unsigned int val; | |
1827 | int ret; | |
1828 | int i; | |
1829 | unsigned long mask; | |
1830 | ||
1831 | ret = -EFAULT; | |
1832 | memset(buffer, 0, sizeof(buffer)); | |
1833 | if (count > sizeof(buffer) - 1) | |
1834 | count = sizeof(buffer) - 1; | |
1835 | if (copy_from_user(buffer, buf, count)) | |
1836 | goto out_no_task; | |
1837 | ||
1838 | ret = -EINVAL; | |
1839 | val = (unsigned int)simple_strtoul(buffer, &end, 0); | |
1840 | if (*end == '\n') | |
1841 | end++; | |
1842 | if (end - buffer == 0) | |
1843 | goto out_no_task; | |
1844 | ||
1845 | ret = -ESRCH; | |
1846 | task = get_proc_task(file->f_dentry->d_inode); | |
1847 | if (!task) | |
1848 | goto out_no_task; | |
1849 | ||
1850 | ret = end - buffer; | |
1851 | mm = get_task_mm(task); | |
1852 | if (!mm) | |
1853 | goto out_no_mm; | |
1854 | ||
1855 | for (i = 0, mask = 1; i < MMF_DUMP_FILTER_BITS; i++, mask <<= 1) { | |
1856 | if (val & mask) | |
1857 | set_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags); | |
1858 | else | |
1859 | clear_bit(i + MMF_DUMP_FILTER_SHIFT, &mm->flags); | |
1860 | } | |
1861 | ||
1862 | mmput(mm); | |
1863 | out_no_mm: | |
1864 | put_task_struct(task); | |
1865 | out_no_task: | |
1866 | return ret; | |
1867 | } | |
1868 | ||
1869 | static const struct file_operations proc_coredump_filter_operations = { | |
1870 | .read = proc_coredump_filter_read, | |
1871 | .write = proc_coredump_filter_write, | |
1872 | }; | |
1873 | #endif | |
1874 | ||
28a6d671 EB |
1875 | /* |
1876 | * /proc/self: | |
1877 | */ | |
1878 | static int proc_self_readlink(struct dentry *dentry, char __user *buffer, | |
1879 | int buflen) | |
1880 | { | |
1881 | char tmp[PROC_NUMBUF]; | |
1882 | sprintf(tmp, "%d", current->tgid); | |
1883 | return vfs_readlink(dentry,buffer,buflen,tmp); | |
1884 | } | |
1885 | ||
1886 | static void *proc_self_follow_link(struct dentry *dentry, struct nameidata *nd) | |
1887 | { | |
1888 | char tmp[PROC_NUMBUF]; | |
1889 | sprintf(tmp, "%d", current->tgid); | |
1890 | return ERR_PTR(vfs_follow_link(nd,tmp)); | |
1891 | } | |
1892 | ||
c5ef1c42 | 1893 | static const struct inode_operations proc_self_inode_operations = { |
28a6d671 EB |
1894 | .readlink = proc_self_readlink, |
1895 | .follow_link = proc_self_follow_link, | |
1896 | }; | |
1897 | ||
801199ce EB |
1898 | /* |
1899 | * proc base | |
1900 | * | |
1901 | * These are the directory entries in the root directory of /proc | |
1902 | * that properly belong to the /proc filesystem, as they describe | |
1903 | * describe something that is process related. | |
1904 | */ | |
c5141e6d | 1905 | static const struct pid_entry proc_base_stuff[] = { |
61a28784 | 1906 | NOD("self", S_IFLNK|S_IRWXUGO, |
801199ce | 1907 | &proc_self_inode_operations, NULL, {}), |
801199ce EB |
1908 | }; |
1909 | ||
1910 | /* | |
1911 | * Exceptional case: normally we are not allowed to unhash a busy | |
1912 | * directory. In this case, however, we can do it - no aliasing problems | |
1913 | * due to the way we treat inodes. | |
1914 | */ | |
1915 | static int proc_base_revalidate(struct dentry *dentry, struct nameidata *nd) | |
1916 | { | |
1917 | struct inode *inode = dentry->d_inode; | |
1918 | struct task_struct *task = get_proc_task(inode); | |
1919 | if (task) { | |
1920 | put_task_struct(task); | |
1921 | return 1; | |
1922 | } | |
1923 | d_drop(dentry); | |
1924 | return 0; | |
1925 | } | |
1926 | ||
1927 | static struct dentry_operations proc_base_dentry_operations = | |
1928 | { | |
1929 | .d_revalidate = proc_base_revalidate, | |
1930 | .d_delete = pid_delete_dentry, | |
1931 | }; | |
1932 | ||
444ceed8 | 1933 | static struct dentry *proc_base_instantiate(struct inode *dir, |
c5141e6d | 1934 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
801199ce | 1935 | { |
c5141e6d | 1936 | const struct pid_entry *p = ptr; |
801199ce | 1937 | struct inode *inode; |
801199ce | 1938 | struct proc_inode *ei; |
444ceed8 | 1939 | struct dentry *error = ERR_PTR(-EINVAL); |
801199ce EB |
1940 | |
1941 | /* Allocate the inode */ | |
1942 | error = ERR_PTR(-ENOMEM); | |
1943 | inode = new_inode(dir->i_sb); | |
1944 | if (!inode) | |
1945 | goto out; | |
1946 | ||
1947 | /* Initialize the inode */ | |
1948 | ei = PROC_I(inode); | |
1949 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; | |
801199ce EB |
1950 | |
1951 | /* | |
1952 | * grab the reference to the task. | |
1953 | */ | |
1a657f78 | 1954 | ei->pid = get_task_pid(task, PIDTYPE_PID); |
801199ce EB |
1955 | if (!ei->pid) |
1956 | goto out_iput; | |
1957 | ||
1958 | inode->i_uid = 0; | |
1959 | inode->i_gid = 0; | |
1960 | inode->i_mode = p->mode; | |
1961 | if (S_ISDIR(inode->i_mode)) | |
1962 | inode->i_nlink = 2; | |
1963 | if (S_ISLNK(inode->i_mode)) | |
1964 | inode->i_size = 64; | |
1965 | if (p->iop) | |
1966 | inode->i_op = p->iop; | |
1967 | if (p->fop) | |
1968 | inode->i_fop = p->fop; | |
1969 | ei->op = p->op; | |
1970 | dentry->d_op = &proc_base_dentry_operations; | |
1971 | d_add(dentry, inode); | |
1972 | error = NULL; | |
1973 | out: | |
801199ce EB |
1974 | return error; |
1975 | out_iput: | |
1976 | iput(inode); | |
1977 | goto out; | |
1978 | } | |
1979 | ||
444ceed8 EB |
1980 | static struct dentry *proc_base_lookup(struct inode *dir, struct dentry *dentry) |
1981 | { | |
1982 | struct dentry *error; | |
1983 | struct task_struct *task = get_proc_task(dir); | |
c5141e6d | 1984 | const struct pid_entry *p, *last; |
444ceed8 EB |
1985 | |
1986 | error = ERR_PTR(-ENOENT); | |
1987 | ||
1988 | if (!task) | |
1989 | goto out_no_task; | |
1990 | ||
1991 | /* Lookup the directory entry */ | |
7bcd6b0e EB |
1992 | last = &proc_base_stuff[ARRAY_SIZE(proc_base_stuff) - 1]; |
1993 | for (p = proc_base_stuff; p <= last; p++) { | |
444ceed8 EB |
1994 | if (p->len != dentry->d_name.len) |
1995 | continue; | |
1996 | if (!memcmp(dentry->d_name.name, p->name, p->len)) | |
1997 | break; | |
1998 | } | |
7bcd6b0e | 1999 | if (p > last) |
444ceed8 EB |
2000 | goto out; |
2001 | ||
2002 | error = proc_base_instantiate(dir, dentry, task, p); | |
2003 | ||
2004 | out: | |
2005 | put_task_struct(task); | |
2006 | out_no_task: | |
2007 | return error; | |
2008 | } | |
2009 | ||
c5141e6d ED |
2010 | static int proc_base_fill_cache(struct file *filp, void *dirent, |
2011 | filldir_t filldir, struct task_struct *task, const struct pid_entry *p) | |
61a28784 EB |
2012 | { |
2013 | return proc_fill_cache(filp, dirent, filldir, p->name, p->len, | |
2014 | proc_base_instantiate, task, p); | |
2015 | } | |
2016 | ||
aba76fdb AM |
2017 | #ifdef CONFIG_TASK_IO_ACCOUNTING |
2018 | static int proc_pid_io_accounting(struct task_struct *task, char *buffer) | |
2019 | { | |
2020 | return sprintf(buffer, | |
4b98d11b | 2021 | #ifdef CONFIG_TASK_XACCT |
aba76fdb AM |
2022 | "rchar: %llu\n" |
2023 | "wchar: %llu\n" | |
2024 | "syscr: %llu\n" | |
2025 | "syscw: %llu\n" | |
4b98d11b | 2026 | #endif |
aba76fdb AM |
2027 | "read_bytes: %llu\n" |
2028 | "write_bytes: %llu\n" | |
2029 | "cancelled_write_bytes: %llu\n", | |
4b98d11b | 2030 | #ifdef CONFIG_TASK_XACCT |
aba76fdb AM |
2031 | (unsigned long long)task->rchar, |
2032 | (unsigned long long)task->wchar, | |
2033 | (unsigned long long)task->syscr, | |
2034 | (unsigned long long)task->syscw, | |
4b98d11b | 2035 | #endif |
aba76fdb AM |
2036 | (unsigned long long)task->ioac.read_bytes, |
2037 | (unsigned long long)task->ioac.write_bytes, | |
2038 | (unsigned long long)task->ioac.cancelled_write_bytes); | |
2039 | } | |
2040 | #endif | |
2041 | ||
28a6d671 EB |
2042 | /* |
2043 | * Thread groups | |
2044 | */ | |
00977a59 | 2045 | static const struct file_operations proc_task_operations; |
c5ef1c42 | 2046 | static const struct inode_operations proc_task_inode_operations; |
20cdc894 | 2047 | |
c5141e6d | 2048 | static const struct pid_entry tgid_base_stuff[] = { |
61a28784 EB |
2049 | DIR("task", S_IRUGO|S_IXUGO, task), |
2050 | DIR("fd", S_IRUSR|S_IXUSR, fd), | |
27932742 | 2051 | DIR("fdinfo", S_IRUSR|S_IXUSR, fdinfo), |
61a28784 EB |
2052 | INF("environ", S_IRUSR, pid_environ), |
2053 | INF("auxv", S_IRUSR, pid_auxv), | |
2054 | INF("status", S_IRUGO, pid_status), | |
43ae34cb IM |
2055 | #ifdef CONFIG_SCHED_DEBUG |
2056 | REG("sched", S_IRUGO|S_IWUSR, pid_sched), | |
2057 | #endif | |
61a28784 EB |
2058 | INF("cmdline", S_IRUGO, pid_cmdline), |
2059 | INF("stat", S_IRUGO, tgid_stat), | |
2060 | INF("statm", S_IRUGO, pid_statm), | |
2061 | REG("maps", S_IRUGO, maps), | |
28a6d671 | 2062 | #ifdef CONFIG_NUMA |
61a28784 | 2063 | REG("numa_maps", S_IRUGO, numa_maps), |
28a6d671 | 2064 | #endif |
61a28784 | 2065 | REG("mem", S_IRUSR|S_IWUSR, mem), |
61a28784 EB |
2066 | LNK("cwd", cwd), |
2067 | LNK("root", root), | |
2068 | LNK("exe", exe), | |
2069 | REG("mounts", S_IRUGO, mounts), | |
2070 | REG("mountstats", S_IRUSR, mountstats), | |
28a6d671 | 2071 | #ifdef CONFIG_MMU |
b813e931 | 2072 | REG("clear_refs", S_IWUSR, clear_refs), |
61a28784 | 2073 | REG("smaps", S_IRUGO, smaps), |
28a6d671 EB |
2074 | #endif |
2075 | #ifdef CONFIG_SECURITY | |
72d9dcfc | 2076 | DIR("attr", S_IRUGO|S_IXUGO, attr_dir), |
28a6d671 EB |
2077 | #endif |
2078 | #ifdef CONFIG_KALLSYMS | |
61a28784 | 2079 | INF("wchan", S_IRUGO, pid_wchan), |
28a6d671 EB |
2080 | #endif |
2081 | #ifdef CONFIG_SCHEDSTATS | |
61a28784 | 2082 | INF("schedstat", S_IRUGO, pid_schedstat), |
28a6d671 EB |
2083 | #endif |
2084 | #ifdef CONFIG_CPUSETS | |
61a28784 | 2085 | REG("cpuset", S_IRUGO, cpuset), |
28a6d671 | 2086 | #endif |
61a28784 EB |
2087 | INF("oom_score", S_IRUGO, oom_score), |
2088 | REG("oom_adj", S_IRUGO|S_IWUSR, oom_adjust), | |
28a6d671 | 2089 | #ifdef CONFIG_AUDITSYSCALL |
61a28784 | 2090 | REG("loginuid", S_IWUSR|S_IRUGO, loginuid), |
28a6d671 | 2091 | #endif |
f4f154fd AM |
2092 | #ifdef CONFIG_FAULT_INJECTION |
2093 | REG("make-it-fail", S_IRUGO|S_IWUSR, fault_inject), | |
2094 | #endif | |
3cb4a0bb KH |
2095 | #if defined(USE_ELF_CORE_DUMP) && defined(CONFIG_ELF_CORE) |
2096 | REG("coredump_filter", S_IRUGO|S_IWUSR, coredump_filter), | |
2097 | #endif | |
aba76fdb AM |
2098 | #ifdef CONFIG_TASK_IO_ACCOUNTING |
2099 | INF("io", S_IRUGO, pid_io_accounting), | |
2100 | #endif | |
28a6d671 | 2101 | }; |
1da177e4 | 2102 | |
28a6d671 | 2103 | static int proc_tgid_base_readdir(struct file * filp, |
1da177e4 LT |
2104 | void * dirent, filldir_t filldir) |
2105 | { | |
2106 | return proc_pident_readdir(filp,dirent,filldir, | |
28a6d671 | 2107 | tgid_base_stuff,ARRAY_SIZE(tgid_base_stuff)); |
1da177e4 LT |
2108 | } |
2109 | ||
00977a59 | 2110 | static const struct file_operations proc_tgid_base_operations = { |
1da177e4 | 2111 | .read = generic_read_dir, |
28a6d671 | 2112 | .readdir = proc_tgid_base_readdir, |
1da177e4 LT |
2113 | }; |
2114 | ||
28a6d671 | 2115 | static struct dentry *proc_tgid_base_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd){ |
7bcd6b0e EB |
2116 | return proc_pident_lookup(dir, dentry, |
2117 | tgid_base_stuff, ARRAY_SIZE(tgid_base_stuff)); | |
1da177e4 LT |
2118 | } |
2119 | ||
c5ef1c42 | 2120 | static const struct inode_operations proc_tgid_base_inode_operations = { |
28a6d671 | 2121 | .lookup = proc_tgid_base_lookup, |
99f89551 | 2122 | .getattr = pid_getattr, |
6d76fa58 | 2123 | .setattr = proc_setattr, |
1da177e4 | 2124 | }; |
1da177e4 LT |
2125 | |
2126 | /** | |
48e6484d EB |
2127 | * proc_flush_task - Remove dcache entries for @task from the /proc dcache. |
2128 | * | |
2129 | * @task: task that should be flushed. | |
2130 | * | |
2131 | * Looks in the dcache for | |
2132 | * /proc/@pid | |
2133 | * /proc/@tgid/task/@pid | |
2134 | * if either directory is present flushes it and all of it'ts children | |
2135 | * from the dcache. | |
1da177e4 | 2136 | * |
48e6484d EB |
2137 | * It is safe and reasonable to cache /proc entries for a task until |
2138 | * that task exits. After that they just clog up the dcache with | |
2139 | * useless entries, possibly causing useful dcache entries to be | |
2140 | * flushed instead. This routine is proved to flush those useless | |
2141 | * dcache entries at process exit time. | |
1da177e4 | 2142 | * |
48e6484d EB |
2143 | * NOTE: This routine is just an optimization so it does not guarantee |
2144 | * that no dcache entries will exist at process exit time it | |
2145 | * just makes it very unlikely that any will persist. | |
1da177e4 | 2146 | */ |
48e6484d | 2147 | void proc_flush_task(struct task_struct *task) |
1da177e4 | 2148 | { |
48e6484d | 2149 | struct dentry *dentry, *leader, *dir; |
8578cea7 | 2150 | char buf[PROC_NUMBUF]; |
48e6484d EB |
2151 | struct qstr name; |
2152 | ||
2153 | name.name = buf; | |
2154 | name.len = snprintf(buf, sizeof(buf), "%d", task->pid); | |
2155 | dentry = d_hash_and_lookup(proc_mnt->mnt_root, &name); | |
2156 | if (dentry) { | |
2157 | shrink_dcache_parent(dentry); | |
2158 | d_drop(dentry); | |
2159 | dput(dentry); | |
2160 | } | |
1da177e4 | 2161 | |
48e6484d EB |
2162 | if (thread_group_leader(task)) |
2163 | goto out; | |
1da177e4 | 2164 | |
48e6484d EB |
2165 | name.name = buf; |
2166 | name.len = snprintf(buf, sizeof(buf), "%d", task->tgid); | |
2167 | leader = d_hash_and_lookup(proc_mnt->mnt_root, &name); | |
2168 | if (!leader) | |
2169 | goto out; | |
1da177e4 | 2170 | |
48e6484d EB |
2171 | name.name = "task"; |
2172 | name.len = strlen(name.name); | |
2173 | dir = d_hash_and_lookup(leader, &name); | |
2174 | if (!dir) | |
2175 | goto out_put_leader; | |
2176 | ||
2177 | name.name = buf; | |
2178 | name.len = snprintf(buf, sizeof(buf), "%d", task->pid); | |
2179 | dentry = d_hash_and_lookup(dir, &name); | |
2180 | if (dentry) { | |
2181 | shrink_dcache_parent(dentry); | |
2182 | d_drop(dentry); | |
2183 | dput(dentry); | |
1da177e4 | 2184 | } |
48e6484d EB |
2185 | |
2186 | dput(dir); | |
2187 | out_put_leader: | |
2188 | dput(leader); | |
2189 | out: | |
2190 | return; | |
1da177e4 LT |
2191 | } |
2192 | ||
9711ef99 AB |
2193 | static struct dentry *proc_pid_instantiate(struct inode *dir, |
2194 | struct dentry * dentry, | |
c5141e6d | 2195 | struct task_struct *task, const void *ptr) |
444ceed8 EB |
2196 | { |
2197 | struct dentry *error = ERR_PTR(-ENOENT); | |
2198 | struct inode *inode; | |
2199 | ||
61a28784 | 2200 | inode = proc_pid_make_inode(dir->i_sb, task); |
444ceed8 EB |
2201 | if (!inode) |
2202 | goto out; | |
2203 | ||
2204 | inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO; | |
2205 | inode->i_op = &proc_tgid_base_inode_operations; | |
2206 | inode->i_fop = &proc_tgid_base_operations; | |
2207 | inode->i_flags|=S_IMMUTABLE; | |
27932742 | 2208 | inode->i_nlink = 5; |
444ceed8 EB |
2209 | #ifdef CONFIG_SECURITY |
2210 | inode->i_nlink += 1; | |
2211 | #endif | |
2212 | ||
2213 | dentry->d_op = &pid_dentry_operations; | |
2214 | ||
2215 | d_add(dentry, inode); | |
2216 | /* Close the race of the process dying before we return the dentry */ | |
2217 | if (pid_revalidate(dentry, NULL)) | |
2218 | error = NULL; | |
2219 | out: | |
2220 | return error; | |
2221 | } | |
2222 | ||
1da177e4 LT |
2223 | struct dentry *proc_pid_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd) |
2224 | { | |
cd6a3ce9 | 2225 | struct dentry *result = ERR_PTR(-ENOENT); |
1da177e4 | 2226 | struct task_struct *task; |
1da177e4 | 2227 | unsigned tgid; |
1da177e4 | 2228 | |
801199ce EB |
2229 | result = proc_base_lookup(dir, dentry); |
2230 | if (!IS_ERR(result) || PTR_ERR(result) != -ENOENT) | |
2231 | goto out; | |
2232 | ||
1da177e4 LT |
2233 | tgid = name_to_int(dentry); |
2234 | if (tgid == ~0U) | |
2235 | goto out; | |
2236 | ||
de758734 | 2237 | rcu_read_lock(); |
1da177e4 LT |
2238 | task = find_task_by_pid(tgid); |
2239 | if (task) | |
2240 | get_task_struct(task); | |
de758734 | 2241 | rcu_read_unlock(); |
1da177e4 LT |
2242 | if (!task) |
2243 | goto out; | |
2244 | ||
444ceed8 | 2245 | result = proc_pid_instantiate(dir, dentry, task, NULL); |
1da177e4 | 2246 | put_task_struct(task); |
1da177e4 | 2247 | out: |
cd6a3ce9 | 2248 | return result; |
1da177e4 LT |
2249 | } |
2250 | ||
1da177e4 | 2251 | /* |
0804ef4b | 2252 | * Find the first task with tgid >= tgid |
0bc58a91 | 2253 | * |
1da177e4 | 2254 | */ |
0804ef4b | 2255 | static struct task_struct *next_tgid(unsigned int tgid) |
1da177e4 | 2256 | { |
0804ef4b EB |
2257 | struct task_struct *task; |
2258 | struct pid *pid; | |
1da177e4 | 2259 | |
454cc105 | 2260 | rcu_read_lock(); |
0804ef4b EB |
2261 | retry: |
2262 | task = NULL; | |
2263 | pid = find_ge_pid(tgid); | |
2264 | if (pid) { | |
2265 | tgid = pid->nr + 1; | |
2266 | task = pid_task(pid, PIDTYPE_PID); | |
2267 | /* What we to know is if the pid we have find is the | |
2268 | * pid of a thread_group_leader. Testing for task | |
2269 | * being a thread_group_leader is the obvious thing | |
2270 | * todo but there is a window when it fails, due to | |
2271 | * the pid transfer logic in de_thread. | |
2272 | * | |
2273 | * So we perform the straight forward test of seeing | |
2274 | * if the pid we have found is the pid of a thread | |
2275 | * group leader, and don't worry if the task we have | |
2276 | * found doesn't happen to be a thread group leader. | |
2277 | * As we don't care in the case of readdir. | |
2278 | */ | |
2279 | if (!task || !has_group_leader_pid(task)) | |
2280 | goto retry; | |
2281 | get_task_struct(task); | |
0bc58a91 | 2282 | } |
454cc105 | 2283 | rcu_read_unlock(); |
0804ef4b | 2284 | return task; |
1da177e4 LT |
2285 | } |
2286 | ||
7bcd6b0e | 2287 | #define TGID_OFFSET (FIRST_PROCESS_ENTRY + ARRAY_SIZE(proc_base_stuff)) |
0804ef4b | 2288 | |
61a28784 EB |
2289 | static int proc_pid_fill_cache(struct file *filp, void *dirent, filldir_t filldir, |
2290 | struct task_struct *task, int tgid) | |
2291 | { | |
2292 | char name[PROC_NUMBUF]; | |
2293 | int len = snprintf(name, sizeof(name), "%d", tgid); | |
2294 | return proc_fill_cache(filp, dirent, filldir, name, len, | |
2295 | proc_pid_instantiate, task, NULL); | |
2296 | } | |
2297 | ||
1da177e4 LT |
2298 | /* for the /proc/ directory itself, after non-process stuff has been done */ |
2299 | int proc_pid_readdir(struct file * filp, void * dirent, filldir_t filldir) | |
2300 | { | |
1da177e4 | 2301 | unsigned int nr = filp->f_pos - FIRST_PROCESS_ENTRY; |
2fddfeef | 2302 | struct task_struct *reaper = get_proc_task(filp->f_path.dentry->d_inode); |
0bc58a91 EB |
2303 | struct task_struct *task; |
2304 | int tgid; | |
1da177e4 | 2305 | |
61a28784 EB |
2306 | if (!reaper) |
2307 | goto out_no_task; | |
2308 | ||
7bcd6b0e | 2309 | for (; nr < ARRAY_SIZE(proc_base_stuff); filp->f_pos++, nr++) { |
c5141e6d | 2310 | const struct pid_entry *p = &proc_base_stuff[nr]; |
61a28784 | 2311 | if (proc_base_fill_cache(filp, dirent, filldir, reaper, p) < 0) |
801199ce | 2312 | goto out; |
1da177e4 LT |
2313 | } |
2314 | ||
0804ef4b EB |
2315 | tgid = filp->f_pos - TGID_OFFSET; |
2316 | for (task = next_tgid(tgid); | |
0bc58a91 | 2317 | task; |
0804ef4b | 2318 | put_task_struct(task), task = next_tgid(tgid + 1)) { |
0bc58a91 | 2319 | tgid = task->pid; |
0804ef4b | 2320 | filp->f_pos = tgid + TGID_OFFSET; |
61a28784 | 2321 | if (proc_pid_fill_cache(filp, dirent, filldir, task, tgid) < 0) { |
0bc58a91 | 2322 | put_task_struct(task); |
0804ef4b | 2323 | goto out; |
1da177e4 | 2324 | } |
0bc58a91 | 2325 | } |
0804ef4b EB |
2326 | filp->f_pos = PID_MAX_LIMIT + TGID_OFFSET; |
2327 | out: | |
61a28784 EB |
2328 | put_task_struct(reaper); |
2329 | out_no_task: | |
0bc58a91 EB |
2330 | return 0; |
2331 | } | |
1da177e4 | 2332 | |
28a6d671 EB |
2333 | /* |
2334 | * Tasks | |
2335 | */ | |
c5141e6d | 2336 | static const struct pid_entry tid_base_stuff[] = { |
61a28784 | 2337 | DIR("fd", S_IRUSR|S_IXUSR, fd), |
27932742 | 2338 | DIR("fdinfo", S_IRUSR|S_IXUSR, fdinfo), |
61a28784 EB |
2339 | INF("environ", S_IRUSR, pid_environ), |
2340 | INF("auxv", S_IRUSR, pid_auxv), | |
2341 | INF("status", S_IRUGO, pid_status), | |
43ae34cb IM |
2342 | #ifdef CONFIG_SCHED_DEBUG |
2343 | REG("sched", S_IRUGO|S_IWUSR, pid_sched), | |
2344 | #endif | |
61a28784 EB |
2345 | INF("cmdline", S_IRUGO, pid_cmdline), |
2346 | INF("stat", S_IRUGO, tid_stat), | |
2347 | INF("statm", S_IRUGO, pid_statm), | |
2348 | REG("maps", S_IRUGO, maps), | |
28a6d671 | 2349 | #ifdef CONFIG_NUMA |
61a28784 | 2350 | REG("numa_maps", S_IRUGO, numa_maps), |
28a6d671 | 2351 | #endif |
61a28784 | 2352 | REG("mem", S_IRUSR|S_IWUSR, mem), |
61a28784 EB |
2353 | LNK("cwd", cwd), |
2354 | LNK("root", root), | |
2355 | LNK("exe", exe), | |
2356 | REG("mounts", S_IRUGO, mounts), | |
28a6d671 | 2357 | #ifdef CONFIG_MMU |
b813e931 | 2358 | REG("clear_refs", S_IWUSR, clear_refs), |
61a28784 | 2359 | REG("smaps", S_IRUGO, smaps), |
28a6d671 EB |
2360 | #endif |
2361 | #ifdef CONFIG_SECURITY | |
72d9dcfc | 2362 | DIR("attr", S_IRUGO|S_IXUGO, attr_dir), |
28a6d671 EB |
2363 | #endif |
2364 | #ifdef CONFIG_KALLSYMS | |
61a28784 | 2365 | INF("wchan", S_IRUGO, pid_wchan), |
28a6d671 EB |
2366 | #endif |
2367 | #ifdef CONFIG_SCHEDSTATS | |
61a28784 | 2368 | INF("schedstat", S_IRUGO, pid_schedstat), |
28a6d671 EB |
2369 | #endif |
2370 | #ifdef CONFIG_CPUSETS | |
61a28784 | 2371 | REG("cpuset", S_IRUGO, cpuset), |
28a6d671 | 2372 | #endif |
61a28784 EB |
2373 | INF("oom_score", S_IRUGO, oom_score), |
2374 | REG("oom_adj", S_IRUGO|S_IWUSR, oom_adjust), | |
28a6d671 | 2375 | #ifdef CONFIG_AUDITSYSCALL |
61a28784 | 2376 | REG("loginuid", S_IWUSR|S_IRUGO, loginuid), |
28a6d671 | 2377 | #endif |
f4f154fd AM |
2378 | #ifdef CONFIG_FAULT_INJECTION |
2379 | REG("make-it-fail", S_IRUGO|S_IWUSR, fault_inject), | |
2380 | #endif | |
28a6d671 EB |
2381 | }; |
2382 | ||
2383 | static int proc_tid_base_readdir(struct file * filp, | |
2384 | void * dirent, filldir_t filldir) | |
2385 | { | |
2386 | return proc_pident_readdir(filp,dirent,filldir, | |
2387 | tid_base_stuff,ARRAY_SIZE(tid_base_stuff)); | |
2388 | } | |
2389 | ||
2390 | static struct dentry *proc_tid_base_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd){ | |
7bcd6b0e EB |
2391 | return proc_pident_lookup(dir, dentry, |
2392 | tid_base_stuff, ARRAY_SIZE(tid_base_stuff)); | |
28a6d671 EB |
2393 | } |
2394 | ||
00977a59 | 2395 | static const struct file_operations proc_tid_base_operations = { |
28a6d671 EB |
2396 | .read = generic_read_dir, |
2397 | .readdir = proc_tid_base_readdir, | |
2398 | }; | |
2399 | ||
c5ef1c42 | 2400 | static const struct inode_operations proc_tid_base_inode_operations = { |
28a6d671 EB |
2401 | .lookup = proc_tid_base_lookup, |
2402 | .getattr = pid_getattr, | |
2403 | .setattr = proc_setattr, | |
2404 | }; | |
2405 | ||
444ceed8 | 2406 | static struct dentry *proc_task_instantiate(struct inode *dir, |
c5141e6d | 2407 | struct dentry *dentry, struct task_struct *task, const void *ptr) |
444ceed8 EB |
2408 | { |
2409 | struct dentry *error = ERR_PTR(-ENOENT); | |
2410 | struct inode *inode; | |
61a28784 | 2411 | inode = proc_pid_make_inode(dir->i_sb, task); |
444ceed8 EB |
2412 | |
2413 | if (!inode) | |
2414 | goto out; | |
2415 | inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO; | |
2416 | inode->i_op = &proc_tid_base_inode_operations; | |
2417 | inode->i_fop = &proc_tid_base_operations; | |
2418 | inode->i_flags|=S_IMMUTABLE; | |
27932742 | 2419 | inode->i_nlink = 4; |
444ceed8 EB |
2420 | #ifdef CONFIG_SECURITY |
2421 | inode->i_nlink += 1; | |
2422 | #endif | |
2423 | ||
2424 | dentry->d_op = &pid_dentry_operations; | |
2425 | ||
2426 | d_add(dentry, inode); | |
2427 | /* Close the race of the process dying before we return the dentry */ | |
2428 | if (pid_revalidate(dentry, NULL)) | |
2429 | error = NULL; | |
2430 | out: | |
2431 | return error; | |
2432 | } | |
2433 | ||
28a6d671 EB |
2434 | static struct dentry *proc_task_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd) |
2435 | { | |
2436 | struct dentry *result = ERR_PTR(-ENOENT); | |
2437 | struct task_struct *task; | |
2438 | struct task_struct *leader = get_proc_task(dir); | |
28a6d671 EB |
2439 | unsigned tid; |
2440 | ||
2441 | if (!leader) | |
2442 | goto out_no_task; | |
2443 | ||
2444 | tid = name_to_int(dentry); | |
2445 | if (tid == ~0U) | |
2446 | goto out; | |
2447 | ||
2448 | rcu_read_lock(); | |
2449 | task = find_task_by_pid(tid); | |
2450 | if (task) | |
2451 | get_task_struct(task); | |
2452 | rcu_read_unlock(); | |
2453 | if (!task) | |
2454 | goto out; | |
2455 | if (leader->tgid != task->tgid) | |
2456 | goto out_drop_task; | |
2457 | ||
444ceed8 | 2458 | result = proc_task_instantiate(dir, dentry, task, NULL); |
28a6d671 EB |
2459 | out_drop_task: |
2460 | put_task_struct(task); | |
2461 | out: | |
2462 | put_task_struct(leader); | |
2463 | out_no_task: | |
2464 | return result; | |
2465 | } | |
2466 | ||
0bc58a91 EB |
2467 | /* |
2468 | * Find the first tid of a thread group to return to user space. | |
2469 | * | |
2470 | * Usually this is just the thread group leader, but if the users | |
2471 | * buffer was too small or there was a seek into the middle of the | |
2472 | * directory we have more work todo. | |
2473 | * | |
2474 | * In the case of a short read we start with find_task_by_pid. | |
2475 | * | |
2476 | * In the case of a seek we start with the leader and walk nr | |
2477 | * threads past it. | |
2478 | */ | |
cc288738 EB |
2479 | static struct task_struct *first_tid(struct task_struct *leader, |
2480 | int tid, int nr) | |
0bc58a91 | 2481 | { |
a872ff0c | 2482 | struct task_struct *pos; |
1da177e4 | 2483 | |
cc288738 | 2484 | rcu_read_lock(); |
0bc58a91 EB |
2485 | /* Attempt to start with the pid of a thread */ |
2486 | if (tid && (nr > 0)) { | |
2487 | pos = find_task_by_pid(tid); | |
a872ff0c ON |
2488 | if (pos && (pos->group_leader == leader)) |
2489 | goto found; | |
0bc58a91 | 2490 | } |
1da177e4 | 2491 | |
0bc58a91 | 2492 | /* If nr exceeds the number of threads there is nothing todo */ |
a872ff0c ON |
2493 | pos = NULL; |
2494 | if (nr && nr >= get_nr_threads(leader)) | |
2495 | goto out; | |
1da177e4 | 2496 | |
a872ff0c ON |
2497 | /* If we haven't found our starting place yet start |
2498 | * with the leader and walk nr threads forward. | |
0bc58a91 | 2499 | */ |
a872ff0c ON |
2500 | for (pos = leader; nr > 0; --nr) { |
2501 | pos = next_thread(pos); | |
2502 | if (pos == leader) { | |
2503 | pos = NULL; | |
2504 | goto out; | |
2505 | } | |
1da177e4 | 2506 | } |
a872ff0c ON |
2507 | found: |
2508 | get_task_struct(pos); | |
2509 | out: | |
cc288738 | 2510 | rcu_read_unlock(); |
0bc58a91 EB |
2511 | return pos; |
2512 | } | |
2513 | ||
2514 | /* | |
2515 | * Find the next thread in the thread list. | |
2516 | * Return NULL if there is an error or no next thread. | |
2517 | * | |
2518 | * The reference to the input task_struct is released. | |
2519 | */ | |
2520 | static struct task_struct *next_tid(struct task_struct *start) | |
2521 | { | |
c1df7fb8 | 2522 | struct task_struct *pos = NULL; |
cc288738 | 2523 | rcu_read_lock(); |
c1df7fb8 | 2524 | if (pid_alive(start)) { |
0bc58a91 | 2525 | pos = next_thread(start); |
c1df7fb8 ON |
2526 | if (thread_group_leader(pos)) |
2527 | pos = NULL; | |
2528 | else | |
2529 | get_task_struct(pos); | |
2530 | } | |
cc288738 | 2531 | rcu_read_unlock(); |
0bc58a91 EB |
2532 | put_task_struct(start); |
2533 | return pos; | |
1da177e4 LT |
2534 | } |
2535 | ||
61a28784 EB |
2536 | static int proc_task_fill_cache(struct file *filp, void *dirent, filldir_t filldir, |
2537 | struct task_struct *task, int tid) | |
2538 | { | |
2539 | char name[PROC_NUMBUF]; | |
2540 | int len = snprintf(name, sizeof(name), "%d", tid); | |
2541 | return proc_fill_cache(filp, dirent, filldir, name, len, | |
2542 | proc_task_instantiate, task, NULL); | |
2543 | } | |
2544 | ||
1da177e4 LT |
2545 | /* for the /proc/TGID/task/ directories */ |
2546 | static int proc_task_readdir(struct file * filp, void * dirent, filldir_t filldir) | |
2547 | { | |
2fddfeef | 2548 | struct dentry *dentry = filp->f_path.dentry; |
1da177e4 | 2549 | struct inode *inode = dentry->d_inode; |
7d895244 | 2550 | struct task_struct *leader = NULL; |
0bc58a91 | 2551 | struct task_struct *task; |
1da177e4 LT |
2552 | int retval = -ENOENT; |
2553 | ino_t ino; | |
0bc58a91 | 2554 | int tid; |
1da177e4 LT |
2555 | unsigned long pos = filp->f_pos; /* avoiding "long long" filp->f_pos */ |
2556 | ||
7d895244 GC |
2557 | task = get_proc_task(inode); |
2558 | if (!task) | |
2559 | goto out_no_task; | |
2560 | rcu_read_lock(); | |
2561 | if (pid_alive(task)) { | |
2562 | leader = task->group_leader; | |
2563 | get_task_struct(leader); | |
2564 | } | |
2565 | rcu_read_unlock(); | |
2566 | put_task_struct(task); | |
99f89551 EB |
2567 | if (!leader) |
2568 | goto out_no_task; | |
1da177e4 LT |
2569 | retval = 0; |
2570 | ||
2571 | switch (pos) { | |
2572 | case 0: | |
2573 | ino = inode->i_ino; | |
2574 | if (filldir(dirent, ".", 1, pos, ino, DT_DIR) < 0) | |
2575 | goto out; | |
2576 | pos++; | |
2577 | /* fall through */ | |
2578 | case 1: | |
2579 | ino = parent_ino(dentry); | |
2580 | if (filldir(dirent, "..", 2, pos, ino, DT_DIR) < 0) | |
2581 | goto out; | |
2582 | pos++; | |
2583 | /* fall through */ | |
2584 | } | |
2585 | ||
0bc58a91 EB |
2586 | /* f_version caches the tgid value that the last readdir call couldn't |
2587 | * return. lseek aka telldir automagically resets f_version to 0. | |
2588 | */ | |
2589 | tid = filp->f_version; | |
2590 | filp->f_version = 0; | |
2591 | for (task = first_tid(leader, tid, pos - 2); | |
2592 | task; | |
2593 | task = next_tid(task), pos++) { | |
0bc58a91 | 2594 | tid = task->pid; |
61a28784 | 2595 | if (proc_task_fill_cache(filp, dirent, filldir, task, tid) < 0) { |
0bc58a91 EB |
2596 | /* returning this tgid failed, save it as the first |
2597 | * pid for the next readir call */ | |
2598 | filp->f_version = tid; | |
2599 | put_task_struct(task); | |
1da177e4 | 2600 | break; |
0bc58a91 | 2601 | } |
1da177e4 LT |
2602 | } |
2603 | out: | |
2604 | filp->f_pos = pos; | |
99f89551 EB |
2605 | put_task_struct(leader); |
2606 | out_no_task: | |
1da177e4 LT |
2607 | return retval; |
2608 | } | |
6e66b52b EB |
2609 | |
2610 | static int proc_task_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) | |
2611 | { | |
2612 | struct inode *inode = dentry->d_inode; | |
99f89551 | 2613 | struct task_struct *p = get_proc_task(inode); |
6e66b52b EB |
2614 | generic_fillattr(inode, stat); |
2615 | ||
99f89551 EB |
2616 | if (p) { |
2617 | rcu_read_lock(); | |
2618 | stat->nlink += get_nr_threads(p); | |
2619 | rcu_read_unlock(); | |
2620 | put_task_struct(p); | |
6e66b52b EB |
2621 | } |
2622 | ||
2623 | return 0; | |
2624 | } | |
28a6d671 | 2625 | |
c5ef1c42 | 2626 | static const struct inode_operations proc_task_inode_operations = { |
28a6d671 EB |
2627 | .lookup = proc_task_lookup, |
2628 | .getattr = proc_task_getattr, | |
2629 | .setattr = proc_setattr, | |
2630 | }; | |
2631 | ||
00977a59 | 2632 | static const struct file_operations proc_task_operations = { |
28a6d671 EB |
2633 | .read = generic_read_dir, |
2634 | .readdir = proc_task_readdir, | |
2635 | }; |