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