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