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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> | |
62 | #include <linux/namespace.h> | |
63 | #include <linux/mm.h> | |
64 | #include <linux/smp_lock.h> | |
b835996f | 65 | #include <linux/rcupdate.h> |
1da177e4 LT |
66 | #include <linux/kallsyms.h> |
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> |
1da177e4 LT |
74 | #include "internal.h" |
75 | ||
0f2fe20f EB |
76 | /* NOTE: |
77 | * Implementing inode permission operations in /proc is almost | |
78 | * certainly an error. Permission checks need to happen during | |
79 | * each system call not at open time. The reason is that most of | |
80 | * what we wish to check for permissions in /proc varies at runtime. | |
81 | * | |
82 | * The classic example of a problem is opening file descriptors | |
83 | * in /proc for a task before it execs a suid executable. | |
84 | */ | |
85 | ||
1da177e4 LT |
86 | /* |
87 | * For hysterical raisins we keep the same inumbers as in the old procfs. | |
88 | * Feel free to change the macro below - just keep the range distinct from | |
89 | * inumbers of the rest of procfs (currently those are in 0x0000--0xffff). | |
90 | * As soon as we'll get a separate superblock we will be able to forget | |
91 | * about magical ranges too. | |
92 | */ | |
93 | ||
94 | #define fake_ino(pid,ino) (((pid)<<16)|(ino)) | |
95 | ||
96 | enum pid_directory_inos { | |
97 | PROC_TGID_INO = 2, | |
98 | PROC_TGID_TASK, | |
99 | PROC_TGID_STATUS, | |
100 | PROC_TGID_MEM, | |
101 | #ifdef CONFIG_SECCOMP | |
102 | PROC_TGID_SECCOMP, | |
103 | #endif | |
104 | PROC_TGID_CWD, | |
105 | PROC_TGID_ROOT, | |
106 | PROC_TGID_EXE, | |
107 | PROC_TGID_FD, | |
108 | PROC_TGID_ENVIRON, | |
109 | PROC_TGID_AUXV, | |
110 | PROC_TGID_CMDLINE, | |
111 | PROC_TGID_STAT, | |
112 | PROC_TGID_STATM, | |
113 | PROC_TGID_MAPS, | |
6e21c8f1 | 114 | PROC_TGID_NUMA_MAPS, |
1da177e4 | 115 | PROC_TGID_MOUNTS, |
b4629fe2 | 116 | PROC_TGID_MOUNTSTATS, |
1da177e4 | 117 | PROC_TGID_WCHAN, |
63c6764c | 118 | #ifdef CONFIG_MMU |
e070ad49 | 119 | PROC_TGID_SMAPS, |
63c6764c | 120 | #endif |
1da177e4 LT |
121 | #ifdef CONFIG_SCHEDSTATS |
122 | PROC_TGID_SCHEDSTAT, | |
123 | #endif | |
124 | #ifdef CONFIG_CPUSETS | |
125 | PROC_TGID_CPUSET, | |
126 | #endif | |
127 | #ifdef CONFIG_SECURITY | |
128 | PROC_TGID_ATTR, | |
129 | PROC_TGID_ATTR_CURRENT, | |
130 | PROC_TGID_ATTR_PREV, | |
131 | PROC_TGID_ATTR_EXEC, | |
132 | PROC_TGID_ATTR_FSCREATE, | |
4eb582cf | 133 | PROC_TGID_ATTR_KEYCREATE, |
42c3e03e | 134 | PROC_TGID_ATTR_SOCKCREATE, |
1da177e4 LT |
135 | #endif |
136 | #ifdef CONFIG_AUDITSYSCALL | |
137 | PROC_TGID_LOGINUID, | |
138 | #endif | |
1da177e4 LT |
139 | PROC_TGID_OOM_SCORE, |
140 | PROC_TGID_OOM_ADJUST, | |
141 | PROC_TID_INO, | |
142 | PROC_TID_STATUS, | |
143 | PROC_TID_MEM, | |
144 | #ifdef CONFIG_SECCOMP | |
145 | PROC_TID_SECCOMP, | |
146 | #endif | |
147 | PROC_TID_CWD, | |
148 | PROC_TID_ROOT, | |
149 | PROC_TID_EXE, | |
150 | PROC_TID_FD, | |
151 | PROC_TID_ENVIRON, | |
152 | PROC_TID_AUXV, | |
153 | PROC_TID_CMDLINE, | |
154 | PROC_TID_STAT, | |
155 | PROC_TID_STATM, | |
156 | PROC_TID_MAPS, | |
6e21c8f1 | 157 | PROC_TID_NUMA_MAPS, |
1da177e4 | 158 | PROC_TID_MOUNTS, |
b4629fe2 | 159 | PROC_TID_MOUNTSTATS, |
1da177e4 | 160 | PROC_TID_WCHAN, |
63c6764c | 161 | #ifdef CONFIG_MMU |
e070ad49 | 162 | PROC_TID_SMAPS, |
63c6764c | 163 | #endif |
1da177e4 LT |
164 | #ifdef CONFIG_SCHEDSTATS |
165 | PROC_TID_SCHEDSTAT, | |
166 | #endif | |
167 | #ifdef CONFIG_CPUSETS | |
168 | PROC_TID_CPUSET, | |
169 | #endif | |
170 | #ifdef CONFIG_SECURITY | |
171 | PROC_TID_ATTR, | |
172 | PROC_TID_ATTR_CURRENT, | |
173 | PROC_TID_ATTR_PREV, | |
174 | PROC_TID_ATTR_EXEC, | |
175 | PROC_TID_ATTR_FSCREATE, | |
4eb582cf | 176 | PROC_TID_ATTR_KEYCREATE, |
42c3e03e | 177 | PROC_TID_ATTR_SOCKCREATE, |
1da177e4 LT |
178 | #endif |
179 | #ifdef CONFIG_AUDITSYSCALL | |
180 | PROC_TID_LOGINUID, | |
181 | #endif | |
1da177e4 LT |
182 | PROC_TID_OOM_SCORE, |
183 | PROC_TID_OOM_ADJUST, | |
5e21ccb1 MS |
184 | |
185 | /* Add new entries before this */ | |
186 | PROC_TID_FD_DIR = 0x8000, /* 0x8000-0xffff */ | |
1da177e4 LT |
187 | }; |
188 | ||
8578cea7 EB |
189 | /* Worst case buffer size needed for holding an integer. */ |
190 | #define PROC_NUMBUF 10 | |
191 | ||
1da177e4 LT |
192 | struct pid_entry { |
193 | int type; | |
194 | int len; | |
195 | char *name; | |
196 | mode_t mode; | |
197 | }; | |
198 | ||
199 | #define E(type,name,mode) {(type),sizeof(name)-1,(name),(mode)} | |
200 | ||
0494f6ec | 201 | static struct fs_struct *get_fs_struct(struct task_struct *task) |
1da177e4 LT |
202 | { |
203 | struct fs_struct *fs; | |
0494f6ec MS |
204 | task_lock(task); |
205 | fs = task->fs; | |
1da177e4 LT |
206 | if(fs) |
207 | atomic_inc(&fs->count); | |
0494f6ec MS |
208 | task_unlock(task); |
209 | return fs; | |
210 | } | |
211 | ||
99f89551 EB |
212 | static int get_nr_threads(struct task_struct *tsk) |
213 | { | |
214 | /* Must be called with the rcu_read_lock held */ | |
215 | unsigned long flags; | |
216 | int count = 0; | |
217 | ||
218 | if (lock_task_sighand(tsk, &flags)) { | |
219 | count = atomic_read(&tsk->signal->count); | |
220 | unlock_task_sighand(tsk, &flags); | |
221 | } | |
222 | return count; | |
223 | } | |
224 | ||
0494f6ec MS |
225 | static int proc_cwd_link(struct inode *inode, struct dentry **dentry, struct vfsmount **mnt) |
226 | { | |
99f89551 EB |
227 | struct task_struct *task = get_proc_task(inode); |
228 | struct fs_struct *fs = NULL; | |
0494f6ec | 229 | int result = -ENOENT; |
99f89551 EB |
230 | |
231 | if (task) { | |
232 | fs = get_fs_struct(task); | |
233 | put_task_struct(task); | |
234 | } | |
1da177e4 LT |
235 | if (fs) { |
236 | read_lock(&fs->lock); | |
237 | *mnt = mntget(fs->pwdmnt); | |
238 | *dentry = dget(fs->pwd); | |
239 | read_unlock(&fs->lock); | |
240 | result = 0; | |
241 | put_fs_struct(fs); | |
242 | } | |
243 | return result; | |
244 | } | |
245 | ||
246 | static int proc_root_link(struct inode *inode, struct dentry **dentry, struct vfsmount **mnt) | |
247 | { | |
99f89551 EB |
248 | struct task_struct *task = get_proc_task(inode); |
249 | struct fs_struct *fs = NULL; | |
1da177e4 | 250 | int result = -ENOENT; |
99f89551 EB |
251 | |
252 | if (task) { | |
253 | fs = get_fs_struct(task); | |
254 | put_task_struct(task); | |
255 | } | |
1da177e4 LT |
256 | if (fs) { |
257 | read_lock(&fs->lock); | |
258 | *mnt = mntget(fs->rootmnt); | |
259 | *dentry = dget(fs->root); | |
260 | read_unlock(&fs->lock); | |
261 | result = 0; | |
262 | put_fs_struct(fs); | |
263 | } | |
264 | return result; | |
265 | } | |
266 | ||
267 | #define MAY_PTRACE(task) \ | |
268 | (task == current || \ | |
269 | (task->parent == current && \ | |
270 | (task->ptrace & PT_PTRACED) && \ | |
271 | (task->state == TASK_STOPPED || task->state == TASK_TRACED) && \ | |
272 | security_ptrace(current,task) == 0)) | |
273 | ||
1da177e4 LT |
274 | static int proc_pid_environ(struct task_struct *task, char * buffer) |
275 | { | |
276 | int res = 0; | |
277 | struct mm_struct *mm = get_task_mm(task); | |
278 | if (mm) { | |
279 | unsigned int len = mm->env_end - mm->env_start; | |
280 | if (len > PAGE_SIZE) | |
281 | len = PAGE_SIZE; | |
282 | res = access_process_vm(task, mm->env_start, buffer, len, 0); | |
ab8d11be | 283 | if (!ptrace_may_attach(task)) |
1da177e4 LT |
284 | res = -ESRCH; |
285 | mmput(mm); | |
286 | } | |
287 | return res; | |
288 | } | |
289 | ||
290 | static int proc_pid_cmdline(struct task_struct *task, char * buffer) | |
291 | { | |
292 | int res = 0; | |
293 | unsigned int len; | |
294 | struct mm_struct *mm = get_task_mm(task); | |
295 | if (!mm) | |
296 | goto out; | |
297 | if (!mm->arg_end) | |
298 | goto out_mm; /* Shh! No looking before we're done */ | |
299 | ||
300 | len = mm->arg_end - mm->arg_start; | |
301 | ||
302 | if (len > PAGE_SIZE) | |
303 | len = PAGE_SIZE; | |
304 | ||
305 | res = access_process_vm(task, mm->arg_start, buffer, len, 0); | |
306 | ||
307 | // If the nul at the end of args has been overwritten, then | |
308 | // assume application is using setproctitle(3). | |
309 | if (res > 0 && buffer[res-1] != '\0' && len < PAGE_SIZE) { | |
310 | len = strnlen(buffer, res); | |
311 | if (len < res) { | |
312 | res = len; | |
313 | } else { | |
314 | len = mm->env_end - mm->env_start; | |
315 | if (len > PAGE_SIZE - res) | |
316 | len = PAGE_SIZE - res; | |
317 | res += access_process_vm(task, mm->env_start, buffer+res, len, 0); | |
318 | res = strnlen(buffer, res); | |
319 | } | |
320 | } | |
321 | out_mm: | |
322 | mmput(mm); | |
323 | out: | |
324 | return res; | |
325 | } | |
326 | ||
327 | static int proc_pid_auxv(struct task_struct *task, char *buffer) | |
328 | { | |
329 | int res = 0; | |
330 | struct mm_struct *mm = get_task_mm(task); | |
331 | if (mm) { | |
332 | unsigned int nwords = 0; | |
333 | do | |
334 | nwords += 2; | |
335 | while (mm->saved_auxv[nwords - 2] != 0); /* AT_NULL */ | |
336 | res = nwords * sizeof(mm->saved_auxv[0]); | |
337 | if (res > PAGE_SIZE) | |
338 | res = PAGE_SIZE; | |
339 | memcpy(buffer, mm->saved_auxv, res); | |
340 | mmput(mm); | |
341 | } | |
342 | return res; | |
343 | } | |
344 | ||
345 | ||
346 | #ifdef CONFIG_KALLSYMS | |
347 | /* | |
348 | * Provides a wchan file via kallsyms in a proper one-value-per-file format. | |
349 | * Returns the resolved symbol. If that fails, simply return the address. | |
350 | */ | |
351 | static int proc_pid_wchan(struct task_struct *task, char *buffer) | |
352 | { | |
353 | char *modname; | |
354 | const char *sym_name; | |
355 | unsigned long wchan, size, offset; | |
356 | char namebuf[KSYM_NAME_LEN+1]; | |
357 | ||
358 | wchan = get_wchan(task); | |
359 | ||
360 | sym_name = kallsyms_lookup(wchan, &size, &offset, &modname, namebuf); | |
361 | if (sym_name) | |
362 | return sprintf(buffer, "%s", sym_name); | |
363 | return sprintf(buffer, "%lu", wchan); | |
364 | } | |
365 | #endif /* CONFIG_KALLSYMS */ | |
366 | ||
367 | #ifdef CONFIG_SCHEDSTATS | |
368 | /* | |
369 | * Provides /proc/PID/schedstat | |
370 | */ | |
371 | static int proc_pid_schedstat(struct task_struct *task, char *buffer) | |
372 | { | |
373 | return sprintf(buffer, "%lu %lu %lu\n", | |
374 | task->sched_info.cpu_time, | |
375 | task->sched_info.run_delay, | |
376 | task->sched_info.pcnt); | |
377 | } | |
378 | #endif | |
379 | ||
380 | /* The badness from the OOM killer */ | |
381 | unsigned long badness(struct task_struct *p, unsigned long uptime); | |
382 | static int proc_oom_score(struct task_struct *task, char *buffer) | |
383 | { | |
384 | unsigned long points; | |
385 | struct timespec uptime; | |
386 | ||
387 | do_posix_clock_monotonic_gettime(&uptime); | |
388 | points = badness(task, uptime.tv_sec); | |
389 | return sprintf(buffer, "%lu\n", points); | |
390 | } | |
391 | ||
392 | /************************************************************************/ | |
393 | /* Here the fs part begins */ | |
394 | /************************************************************************/ | |
395 | ||
396 | /* permission checks */ | |
778c1144 | 397 | static int proc_fd_access_allowed(struct inode *inode) |
1da177e4 | 398 | { |
778c1144 EB |
399 | struct task_struct *task; |
400 | int allowed = 0; | |
df26c40e EB |
401 | /* Allow access to a task's file descriptors if it is us or we |
402 | * may use ptrace attach to the process and find out that | |
403 | * information. | |
778c1144 EB |
404 | */ |
405 | task = get_proc_task(inode); | |
df26c40e EB |
406 | if (task) { |
407 | allowed = ptrace_may_attach(task); | |
778c1144 | 408 | put_task_struct(task); |
df26c40e | 409 | } |
778c1144 | 410 | return allowed; |
1da177e4 LT |
411 | } |
412 | ||
6d76fa58 LT |
413 | static int proc_setattr(struct dentry *dentry, struct iattr *attr) |
414 | { | |
415 | int error; | |
416 | struct inode *inode = dentry->d_inode; | |
417 | ||
418 | if (attr->ia_valid & ATTR_MODE) | |
419 | return -EPERM; | |
420 | ||
421 | error = inode_change_ok(inode, attr); | |
422 | if (!error) { | |
423 | error = security_inode_setattr(dentry, attr); | |
424 | if (!error) | |
425 | error = inode_setattr(inode, attr); | |
426 | } | |
427 | return error; | |
428 | } | |
429 | ||
430 | static struct inode_operations proc_def_inode_operations = { | |
431 | .setattr = proc_setattr, | |
432 | }; | |
433 | ||
1da177e4 | 434 | extern struct seq_operations mounts_op; |
5addc5dd AV |
435 | struct proc_mounts { |
436 | struct seq_file m; | |
437 | int event; | |
438 | }; | |
439 | ||
1da177e4 LT |
440 | static int mounts_open(struct inode *inode, struct file *file) |
441 | { | |
99f89551 EB |
442 | struct task_struct *task = get_proc_task(inode); |
443 | struct namespace *namespace = NULL; | |
5addc5dd AV |
444 | struct proc_mounts *p; |
445 | int ret = -EINVAL; | |
1da177e4 | 446 | |
99f89551 EB |
447 | if (task) { |
448 | task_lock(task); | |
449 | namespace = task->namespace; | |
450 | if (namespace) | |
451 | get_namespace(namespace); | |
452 | task_unlock(task); | |
453 | put_task_struct(task); | |
454 | } | |
5addc5dd AV |
455 | |
456 | if (namespace) { | |
457 | ret = -ENOMEM; | |
458 | p = kmalloc(sizeof(struct proc_mounts), GFP_KERNEL); | |
459 | if (p) { | |
460 | file->private_data = &p->m; | |
461 | ret = seq_open(file, &mounts_op); | |
462 | if (!ret) { | |
463 | p->m.private = namespace; | |
464 | p->event = namespace->event; | |
465 | return 0; | |
466 | } | |
467 | kfree(p); | |
1da177e4 | 468 | } |
5addc5dd | 469 | put_namespace(namespace); |
1da177e4 LT |
470 | } |
471 | return ret; | |
472 | } | |
473 | ||
474 | static int mounts_release(struct inode *inode, struct file *file) | |
475 | { | |
476 | struct seq_file *m = file->private_data; | |
477 | struct namespace *namespace = m->private; | |
478 | put_namespace(namespace); | |
479 | return seq_release(inode, file); | |
480 | } | |
481 | ||
5addc5dd AV |
482 | static unsigned mounts_poll(struct file *file, poll_table *wait) |
483 | { | |
484 | struct proc_mounts *p = file->private_data; | |
485 | struct namespace *ns = p->m.private; | |
486 | unsigned res = 0; | |
487 | ||
488 | poll_wait(file, &ns->poll, wait); | |
489 | ||
490 | spin_lock(&vfsmount_lock); | |
491 | if (p->event != ns->event) { | |
492 | p->event = ns->event; | |
493 | res = POLLERR; | |
494 | } | |
495 | spin_unlock(&vfsmount_lock); | |
496 | ||
497 | return res; | |
498 | } | |
499 | ||
1da177e4 LT |
500 | static struct file_operations proc_mounts_operations = { |
501 | .open = mounts_open, | |
502 | .read = seq_read, | |
503 | .llseek = seq_lseek, | |
504 | .release = mounts_release, | |
5addc5dd | 505 | .poll = mounts_poll, |
1da177e4 LT |
506 | }; |
507 | ||
b4629fe2 CL |
508 | extern struct seq_operations mountstats_op; |
509 | static int mountstats_open(struct inode *inode, struct file *file) | |
510 | { | |
b4629fe2 CL |
511 | int ret = seq_open(file, &mountstats_op); |
512 | ||
513 | if (!ret) { | |
514 | struct seq_file *m = file->private_data; | |
99f89551 EB |
515 | struct namespace *namespace = NULL; |
516 | struct task_struct *task = get_proc_task(inode); | |
517 | ||
518 | if (task) { | |
519 | task_lock(task); | |
520 | namespace = task->namespace; | |
521 | if (namespace) | |
522 | get_namespace(namespace); | |
523 | task_unlock(task); | |
524 | put_task_struct(task); | |
525 | } | |
b4629fe2 CL |
526 | |
527 | if (namespace) | |
528 | m->private = namespace; | |
529 | else { | |
530 | seq_release(inode, file); | |
531 | ret = -EINVAL; | |
532 | } | |
533 | } | |
534 | return ret; | |
535 | } | |
536 | ||
537 | static struct file_operations proc_mountstats_operations = { | |
538 | .open = mountstats_open, | |
539 | .read = seq_read, | |
540 | .llseek = seq_lseek, | |
541 | .release = mounts_release, | |
542 | }; | |
543 | ||
1da177e4 LT |
544 | #define PROC_BLOCK_SIZE (3*1024) /* 4K page size but our output routines use some slack for overruns */ |
545 | ||
546 | static ssize_t proc_info_read(struct file * file, char __user * buf, | |
547 | size_t count, loff_t *ppos) | |
548 | { | |
549 | struct inode * inode = file->f_dentry->d_inode; | |
550 | unsigned long page; | |
551 | ssize_t length; | |
99f89551 EB |
552 | struct task_struct *task = get_proc_task(inode); |
553 | ||
554 | length = -ESRCH; | |
555 | if (!task) | |
556 | goto out_no_task; | |
1da177e4 LT |
557 | |
558 | if (count > PROC_BLOCK_SIZE) | |
559 | count = PROC_BLOCK_SIZE; | |
99f89551 EB |
560 | |
561 | length = -ENOMEM; | |
1da177e4 | 562 | if (!(page = __get_free_page(GFP_KERNEL))) |
99f89551 | 563 | goto out; |
1da177e4 LT |
564 | |
565 | length = PROC_I(inode)->op.proc_read(task, (char*)page); | |
566 | ||
567 | if (length >= 0) | |
568 | length = simple_read_from_buffer(buf, count, ppos, (char *)page, length); | |
569 | free_page(page); | |
99f89551 EB |
570 | out: |
571 | put_task_struct(task); | |
572 | out_no_task: | |
1da177e4 LT |
573 | return length; |
574 | } | |
575 | ||
576 | static struct file_operations proc_info_file_operations = { | |
577 | .read = proc_info_read, | |
578 | }; | |
579 | ||
580 | static int mem_open(struct inode* inode, struct file* file) | |
581 | { | |
582 | file->private_data = (void*)((long)current->self_exec_id); | |
583 | return 0; | |
584 | } | |
585 | ||
586 | static ssize_t mem_read(struct file * file, char __user * buf, | |
587 | size_t count, loff_t *ppos) | |
588 | { | |
99f89551 | 589 | struct task_struct *task = get_proc_task(file->f_dentry->d_inode); |
1da177e4 LT |
590 | char *page; |
591 | unsigned long src = *ppos; | |
592 | int ret = -ESRCH; | |
593 | struct mm_struct *mm; | |
594 | ||
99f89551 EB |
595 | if (!task) |
596 | goto out_no_task; | |
597 | ||
ab8d11be | 598 | if (!MAY_PTRACE(task) || !ptrace_may_attach(task)) |
1da177e4 LT |
599 | goto out; |
600 | ||
601 | ret = -ENOMEM; | |
602 | page = (char *)__get_free_page(GFP_USER); | |
603 | if (!page) | |
604 | goto out; | |
605 | ||
606 | ret = 0; | |
607 | ||
608 | mm = get_task_mm(task); | |
609 | if (!mm) | |
610 | goto out_free; | |
611 | ||
612 | ret = -EIO; | |
613 | ||
614 | if (file->private_data != (void*)((long)current->self_exec_id)) | |
615 | goto out_put; | |
616 | ||
617 | ret = 0; | |
618 | ||
619 | while (count > 0) { | |
620 | int this_len, retval; | |
621 | ||
622 | this_len = (count > PAGE_SIZE) ? PAGE_SIZE : count; | |
623 | retval = access_process_vm(task, src, page, this_len, 0); | |
ab8d11be | 624 | if (!retval || !MAY_PTRACE(task) || !ptrace_may_attach(task)) { |
1da177e4 LT |
625 | if (!ret) |
626 | ret = -EIO; | |
627 | break; | |
628 | } | |
629 | ||
630 | if (copy_to_user(buf, page, retval)) { | |
631 | ret = -EFAULT; | |
632 | break; | |
633 | } | |
634 | ||
635 | ret += retval; | |
636 | src += retval; | |
637 | buf += retval; | |
638 | count -= retval; | |
639 | } | |
640 | *ppos = src; | |
641 | ||
642 | out_put: | |
643 | mmput(mm); | |
644 | out_free: | |
645 | free_page((unsigned long) page); | |
646 | out: | |
99f89551 EB |
647 | put_task_struct(task); |
648 | out_no_task: | |
1da177e4 LT |
649 | return ret; |
650 | } | |
651 | ||
652 | #define mem_write NULL | |
653 | ||
654 | #ifndef mem_write | |
655 | /* This is a security hazard */ | |
656 | static ssize_t mem_write(struct file * file, const char * buf, | |
657 | size_t count, loff_t *ppos) | |
658 | { | |
f7ca54f4 | 659 | int copied; |
1da177e4 | 660 | char *page; |
99f89551 | 661 | struct task_struct *task = get_proc_task(file->f_dentry->d_inode); |
1da177e4 LT |
662 | unsigned long dst = *ppos; |
663 | ||
99f89551 EB |
664 | copied = -ESRCH; |
665 | if (!task) | |
666 | goto out_no_task; | |
667 | ||
ab8d11be | 668 | if (!MAY_PTRACE(task) || !ptrace_may_attach(task)) |
99f89551 | 669 | goto out; |
1da177e4 | 670 | |
99f89551 | 671 | copied = -ENOMEM; |
1da177e4 LT |
672 | page = (char *)__get_free_page(GFP_USER); |
673 | if (!page) | |
99f89551 | 674 | goto out; |
1da177e4 | 675 | |
f7ca54f4 | 676 | copied = 0; |
1da177e4 LT |
677 | while (count > 0) { |
678 | int this_len, retval; | |
679 | ||
680 | this_len = (count > PAGE_SIZE) ? PAGE_SIZE : count; | |
681 | if (copy_from_user(page, buf, this_len)) { | |
682 | copied = -EFAULT; | |
683 | break; | |
684 | } | |
685 | retval = access_process_vm(task, dst, page, this_len, 1); | |
686 | if (!retval) { | |
687 | if (!copied) | |
688 | copied = -EIO; | |
689 | break; | |
690 | } | |
691 | copied += retval; | |
692 | buf += retval; | |
693 | dst += retval; | |
694 | count -= retval; | |
695 | } | |
696 | *ppos = dst; | |
697 | free_page((unsigned long) page); | |
99f89551 EB |
698 | out: |
699 | put_task_struct(task); | |
700 | out_no_task: | |
1da177e4 LT |
701 | return copied; |
702 | } | |
703 | #endif | |
704 | ||
705 | static loff_t mem_lseek(struct file * file, loff_t offset, int orig) | |
706 | { | |
707 | switch (orig) { | |
708 | case 0: | |
709 | file->f_pos = offset; | |
710 | break; | |
711 | case 1: | |
712 | file->f_pos += offset; | |
713 | break; | |
714 | default: | |
715 | return -EINVAL; | |
716 | } | |
717 | force_successful_syscall_return(); | |
718 | return file->f_pos; | |
719 | } | |
720 | ||
721 | static struct file_operations proc_mem_operations = { | |
722 | .llseek = mem_lseek, | |
723 | .read = mem_read, | |
724 | .write = mem_write, | |
725 | .open = mem_open, | |
726 | }; | |
727 | ||
728 | static ssize_t oom_adjust_read(struct file *file, char __user *buf, | |
729 | size_t count, loff_t *ppos) | |
730 | { | |
99f89551 | 731 | struct task_struct *task = get_proc_task(file->f_dentry->d_inode); |
8578cea7 | 732 | char buffer[PROC_NUMBUF]; |
1da177e4 | 733 | size_t len; |
99f89551 | 734 | int oom_adjust; |
1da177e4 LT |
735 | loff_t __ppos = *ppos; |
736 | ||
99f89551 EB |
737 | if (!task) |
738 | return -ESRCH; | |
739 | oom_adjust = task->oomkilladj; | |
740 | put_task_struct(task); | |
741 | ||
8578cea7 | 742 | len = snprintf(buffer, sizeof(buffer), "%i\n", oom_adjust); |
1da177e4 LT |
743 | if (__ppos >= len) |
744 | return 0; | |
745 | if (count > len-__ppos) | |
746 | count = len-__ppos; | |
747 | if (copy_to_user(buf, buffer + __ppos, count)) | |
748 | return -EFAULT; | |
749 | *ppos = __ppos + count; | |
750 | return count; | |
751 | } | |
752 | ||
753 | static ssize_t oom_adjust_write(struct file *file, const char __user *buf, | |
754 | size_t count, loff_t *ppos) | |
755 | { | |
99f89551 | 756 | struct task_struct *task; |
8578cea7 | 757 | char buffer[PROC_NUMBUF], *end; |
1da177e4 LT |
758 | int oom_adjust; |
759 | ||
760 | if (!capable(CAP_SYS_RESOURCE)) | |
761 | return -EPERM; | |
8578cea7 EB |
762 | memset(buffer, 0, sizeof(buffer)); |
763 | if (count > sizeof(buffer) - 1) | |
764 | count = sizeof(buffer) - 1; | |
1da177e4 LT |
765 | if (copy_from_user(buffer, buf, count)) |
766 | return -EFAULT; | |
767 | oom_adjust = simple_strtol(buffer, &end, 0); | |
79befd0c | 768 | if ((oom_adjust < -16 || oom_adjust > 15) && oom_adjust != OOM_DISABLE) |
1da177e4 LT |
769 | return -EINVAL; |
770 | if (*end == '\n') | |
771 | end++; | |
99f89551 EB |
772 | task = get_proc_task(file->f_dentry->d_inode); |
773 | if (!task) | |
774 | return -ESRCH; | |
1da177e4 | 775 | task->oomkilladj = oom_adjust; |
99f89551 | 776 | put_task_struct(task); |
1da177e4 LT |
777 | if (end - buffer == 0) |
778 | return -EIO; | |
779 | return end - buffer; | |
780 | } | |
781 | ||
782 | static struct file_operations proc_oom_adjust_operations = { | |
783 | .read = oom_adjust_read, | |
784 | .write = oom_adjust_write, | |
785 | }; | |
786 | ||
1da177e4 LT |
787 | #ifdef CONFIG_AUDITSYSCALL |
788 | #define TMPBUFLEN 21 | |
789 | static ssize_t proc_loginuid_read(struct file * file, char __user * buf, | |
790 | size_t count, loff_t *ppos) | |
791 | { | |
792 | struct inode * inode = file->f_dentry->d_inode; | |
99f89551 | 793 | struct task_struct *task = get_proc_task(inode); |
1da177e4 LT |
794 | ssize_t length; |
795 | char tmpbuf[TMPBUFLEN]; | |
796 | ||
99f89551 EB |
797 | if (!task) |
798 | return -ESRCH; | |
1da177e4 LT |
799 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", |
800 | audit_get_loginuid(task->audit_context)); | |
99f89551 | 801 | put_task_struct(task); |
1da177e4 LT |
802 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); |
803 | } | |
804 | ||
805 | static ssize_t proc_loginuid_write(struct file * file, const char __user * buf, | |
806 | size_t count, loff_t *ppos) | |
807 | { | |
808 | struct inode * inode = file->f_dentry->d_inode; | |
809 | char *page, *tmp; | |
810 | ssize_t length; | |
1da177e4 LT |
811 | uid_t loginuid; |
812 | ||
813 | if (!capable(CAP_AUDIT_CONTROL)) | |
814 | return -EPERM; | |
815 | ||
13b41b09 | 816 | if (current != pid_task(proc_pid(inode), PIDTYPE_PID)) |
1da177e4 LT |
817 | return -EPERM; |
818 | ||
e0182909 AV |
819 | if (count >= PAGE_SIZE) |
820 | count = PAGE_SIZE - 1; | |
1da177e4 LT |
821 | |
822 | if (*ppos != 0) { | |
823 | /* No partial writes. */ | |
824 | return -EINVAL; | |
825 | } | |
826 | page = (char*)__get_free_page(GFP_USER); | |
827 | if (!page) | |
828 | return -ENOMEM; | |
829 | length = -EFAULT; | |
830 | if (copy_from_user(page, buf, count)) | |
831 | goto out_free_page; | |
832 | ||
e0182909 | 833 | page[count] = '\0'; |
1da177e4 LT |
834 | loginuid = simple_strtoul(page, &tmp, 10); |
835 | if (tmp == page) { | |
836 | length = -EINVAL; | |
837 | goto out_free_page; | |
838 | ||
839 | } | |
99f89551 | 840 | length = audit_set_loginuid(current, loginuid); |
1da177e4 LT |
841 | if (likely(length == 0)) |
842 | length = count; | |
843 | ||
844 | out_free_page: | |
845 | free_page((unsigned long) page); | |
846 | return length; | |
847 | } | |
848 | ||
849 | static struct file_operations proc_loginuid_operations = { | |
850 | .read = proc_loginuid_read, | |
851 | .write = proc_loginuid_write, | |
852 | }; | |
853 | #endif | |
854 | ||
855 | #ifdef CONFIG_SECCOMP | |
856 | static ssize_t seccomp_read(struct file *file, char __user *buf, | |
857 | size_t count, loff_t *ppos) | |
858 | { | |
99f89551 | 859 | struct task_struct *tsk = get_proc_task(file->f_dentry->d_inode); |
1da177e4 LT |
860 | char __buf[20]; |
861 | loff_t __ppos = *ppos; | |
862 | size_t len; | |
863 | ||
99f89551 EB |
864 | if (!tsk) |
865 | return -ESRCH; | |
1da177e4 LT |
866 | /* no need to print the trailing zero, so use only len */ |
867 | len = sprintf(__buf, "%u\n", tsk->seccomp.mode); | |
99f89551 | 868 | put_task_struct(tsk); |
1da177e4 LT |
869 | if (__ppos >= len) |
870 | return 0; | |
871 | if (count > len - __ppos) | |
872 | count = len - __ppos; | |
873 | if (copy_to_user(buf, __buf + __ppos, count)) | |
874 | return -EFAULT; | |
875 | *ppos = __ppos + count; | |
876 | return count; | |
877 | } | |
878 | ||
879 | static ssize_t seccomp_write(struct file *file, const char __user *buf, | |
880 | size_t count, loff_t *ppos) | |
881 | { | |
99f89551 | 882 | struct task_struct *tsk = get_proc_task(file->f_dentry->d_inode); |
1da177e4 LT |
883 | char __buf[20], *end; |
884 | unsigned int seccomp_mode; | |
99f89551 EB |
885 | ssize_t result; |
886 | ||
887 | result = -ESRCH; | |
888 | if (!tsk) | |
889 | goto out_no_task; | |
1da177e4 LT |
890 | |
891 | /* can set it only once to be even more secure */ | |
99f89551 | 892 | result = -EPERM; |
1da177e4 | 893 | if (unlikely(tsk->seccomp.mode)) |
99f89551 | 894 | goto out; |
1da177e4 | 895 | |
99f89551 | 896 | result = -EFAULT; |
1da177e4 LT |
897 | memset(__buf, 0, sizeof(__buf)); |
898 | count = min(count, sizeof(__buf) - 1); | |
899 | if (copy_from_user(__buf, buf, count)) | |
99f89551 EB |
900 | goto out; |
901 | ||
1da177e4 LT |
902 | seccomp_mode = simple_strtoul(__buf, &end, 0); |
903 | if (*end == '\n') | |
904 | end++; | |
99f89551 | 905 | result = -EINVAL; |
1da177e4 LT |
906 | if (seccomp_mode && seccomp_mode <= NR_SECCOMP_MODES) { |
907 | tsk->seccomp.mode = seccomp_mode; | |
908 | set_tsk_thread_flag(tsk, TIF_SECCOMP); | |
909 | } else | |
99f89551 EB |
910 | goto out; |
911 | result = -EIO; | |
1da177e4 | 912 | if (unlikely(!(end - __buf))) |
99f89551 EB |
913 | goto out; |
914 | result = end - __buf; | |
915 | out: | |
916 | put_task_struct(tsk); | |
917 | out_no_task: | |
918 | return result; | |
1da177e4 LT |
919 | } |
920 | ||
921 | static struct file_operations proc_seccomp_operations = { | |
922 | .read = seccomp_read, | |
923 | .write = seccomp_write, | |
924 | }; | |
925 | #endif /* CONFIG_SECCOMP */ | |
926 | ||
008b150a | 927 | static void *proc_pid_follow_link(struct dentry *dentry, struct nameidata *nd) |
1da177e4 LT |
928 | { |
929 | struct inode *inode = dentry->d_inode; | |
930 | int error = -EACCES; | |
931 | ||
932 | /* We don't need a base pointer in the /proc filesystem */ | |
933 | path_release(nd); | |
934 | ||
778c1144 EB |
935 | /* Are we allowed to snoop on the tasks file descriptors? */ |
936 | if (!proc_fd_access_allowed(inode)) | |
1da177e4 | 937 | goto out; |
1da177e4 LT |
938 | |
939 | error = PROC_I(inode)->op.proc_get_link(inode, &nd->dentry, &nd->mnt); | |
940 | nd->last_type = LAST_BIND; | |
941 | out: | |
008b150a | 942 | return ERR_PTR(error); |
1da177e4 LT |
943 | } |
944 | ||
945 | static int do_proc_readlink(struct dentry *dentry, struct vfsmount *mnt, | |
946 | char __user *buffer, int buflen) | |
947 | { | |
948 | struct inode * inode; | |
949 | char *tmp = (char*)__get_free_page(GFP_KERNEL), *path; | |
950 | int len; | |
951 | ||
952 | if (!tmp) | |
953 | return -ENOMEM; | |
954 | ||
955 | inode = dentry->d_inode; | |
956 | path = d_path(dentry, mnt, tmp, PAGE_SIZE); | |
957 | len = PTR_ERR(path); | |
958 | if (IS_ERR(path)) | |
959 | goto out; | |
960 | len = tmp + PAGE_SIZE - 1 - path; | |
961 | ||
962 | if (len > buflen) | |
963 | len = buflen; | |
964 | if (copy_to_user(buffer, path, len)) | |
965 | len = -EFAULT; | |
966 | out: | |
967 | free_page((unsigned long)tmp); | |
968 | return len; | |
969 | } | |
970 | ||
971 | static int proc_pid_readlink(struct dentry * dentry, char __user * buffer, int buflen) | |
972 | { | |
973 | int error = -EACCES; | |
974 | struct inode *inode = dentry->d_inode; | |
975 | struct dentry *de; | |
976 | struct vfsmount *mnt = NULL; | |
977 | ||
778c1144 EB |
978 | /* Are we allowed to snoop on the tasks file descriptors? */ |
979 | if (!proc_fd_access_allowed(inode)) | |
1da177e4 | 980 | goto out; |
1da177e4 LT |
981 | |
982 | error = PROC_I(inode)->op.proc_get_link(inode, &de, &mnt); | |
983 | if (error) | |
984 | goto out; | |
985 | ||
986 | error = do_proc_readlink(de, mnt, buffer, buflen); | |
987 | dput(de); | |
988 | mntput(mnt); | |
989 | out: | |
1da177e4 LT |
990 | return error; |
991 | } | |
992 | ||
993 | static struct inode_operations proc_pid_link_inode_operations = { | |
994 | .readlink = proc_pid_readlink, | |
6d76fa58 LT |
995 | .follow_link = proc_pid_follow_link, |
996 | .setattr = proc_setattr, | |
1da177e4 LT |
997 | }; |
998 | ||
28a6d671 EB |
999 | |
1000 | /* building an inode */ | |
1001 | ||
1002 | static int task_dumpable(struct task_struct *task) | |
1da177e4 | 1003 | { |
28a6d671 EB |
1004 | int dumpable = 0; |
1005 | struct mm_struct *mm; | |
1da177e4 | 1006 | |
28a6d671 EB |
1007 | task_lock(task); |
1008 | mm = task->mm; | |
1009 | if (mm) | |
1010 | dumpable = mm->dumpable; | |
1011 | task_unlock(task); | |
1012 | if(dumpable == 1) | |
1013 | return 1; | |
1014 | return 0; | |
1015 | } | |
1da177e4 | 1016 | |
1da177e4 | 1017 | |
28a6d671 EB |
1018 | static struct inode *proc_pid_make_inode(struct super_block * sb, struct task_struct *task, int ino) |
1019 | { | |
1020 | struct inode * inode; | |
1021 | struct proc_inode *ei; | |
1da177e4 | 1022 | |
28a6d671 | 1023 | /* We need a new inode */ |
1da177e4 | 1024 | |
28a6d671 EB |
1025 | inode = new_inode(sb); |
1026 | if (!inode) | |
1027 | goto out; | |
1028 | ||
1029 | /* Common stuff */ | |
1030 | ei = PROC_I(inode); | |
1031 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; | |
1032 | inode->i_ino = fake_ino(task->pid, ino); | |
1033 | inode->i_op = &proc_def_inode_operations; | |
1034 | ||
1035 | /* | |
1036 | * grab the reference to task. | |
1037 | */ | |
1038 | ei->pid = get_pid(task->pids[PIDTYPE_PID].pid); | |
1039 | if (!ei->pid) | |
1040 | goto out_unlock; | |
1041 | ||
1042 | inode->i_uid = 0; | |
1043 | inode->i_gid = 0; | |
1044 | if (task_dumpable(task)) { | |
1045 | inode->i_uid = task->euid; | |
1046 | inode->i_gid = task->egid; | |
1da177e4 | 1047 | } |
28a6d671 EB |
1048 | security_task_to_inode(task, inode); |
1049 | ||
1da177e4 | 1050 | out: |
28a6d671 EB |
1051 | return inode; |
1052 | ||
1053 | out_unlock: | |
1054 | iput(inode); | |
1055 | return NULL; | |
1da177e4 LT |
1056 | } |
1057 | ||
28a6d671 | 1058 | static int pid_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) |
1da177e4 | 1059 | { |
1da177e4 | 1060 | struct inode *inode = dentry->d_inode; |
28a6d671 EB |
1061 | struct task_struct *task; |
1062 | generic_fillattr(inode, stat); | |
1da177e4 | 1063 | |
28a6d671 EB |
1064 | rcu_read_lock(); |
1065 | stat->uid = 0; | |
1066 | stat->gid = 0; | |
1067 | task = pid_task(proc_pid(inode), PIDTYPE_PID); | |
1068 | if (task) { | |
1069 | if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) || | |
1070 | task_dumpable(task)) { | |
1071 | stat->uid = task->euid; | |
1072 | stat->gid = task->egid; | |
1da177e4 LT |
1073 | } |
1074 | } | |
28a6d671 | 1075 | rcu_read_unlock(); |
d6e71144 | 1076 | return 0; |
1da177e4 LT |
1077 | } |
1078 | ||
1da177e4 LT |
1079 | /* dentry stuff */ |
1080 | ||
1081 | /* | |
1082 | * Exceptional case: normally we are not allowed to unhash a busy | |
1083 | * directory. In this case, however, we can do it - no aliasing problems | |
1084 | * due to the way we treat inodes. | |
1085 | * | |
1086 | * Rewrite the inode's ownerships here because the owning task may have | |
1087 | * performed a setuid(), etc. | |
99f89551 EB |
1088 | * |
1089 | * Before the /proc/pid/status file was created the only way to read | |
1090 | * the effective uid of a /process was to stat /proc/pid. Reading | |
1091 | * /proc/pid/status is slow enough that procps and other packages | |
1092 | * kept stating /proc/pid. To keep the rules in /proc simple I have | |
1093 | * made this apply to all per process world readable and executable | |
1094 | * directories. | |
1da177e4 LT |
1095 | */ |
1096 | static int pid_revalidate(struct dentry *dentry, struct nameidata *nd) | |
1097 | { | |
1098 | struct inode *inode = dentry->d_inode; | |
99f89551 EB |
1099 | struct task_struct *task = get_proc_task(inode); |
1100 | if (task) { | |
1101 | if ((inode->i_mode == (S_IFDIR|S_IRUGO|S_IXUGO)) || | |
1102 | task_dumpable(task)) { | |
1da177e4 LT |
1103 | inode->i_uid = task->euid; |
1104 | inode->i_gid = task->egid; | |
1105 | } else { | |
1106 | inode->i_uid = 0; | |
1107 | inode->i_gid = 0; | |
1108 | } | |
9ee8ab9f | 1109 | inode->i_mode &= ~(S_ISUID | S_ISGID); |
1da177e4 | 1110 | security_task_to_inode(task, inode); |
99f89551 | 1111 | put_task_struct(task); |
1da177e4 LT |
1112 | return 1; |
1113 | } | |
1114 | d_drop(dentry); | |
1115 | return 0; | |
1116 | } | |
1117 | ||
28a6d671 | 1118 | static int pid_delete_dentry(struct dentry * dentry) |
99f89551 | 1119 | { |
28a6d671 EB |
1120 | /* Is the task we represent dead? |
1121 | * If so, then don't put the dentry on the lru list, | |
1122 | * kill it immediately. | |
1123 | */ | |
1124 | return !proc_pid(dentry->d_inode)->tasks[PIDTYPE_PID].first; | |
1125 | } | |
1126 | ||
1127 | static struct dentry_operations pid_dentry_operations = | |
1128 | { | |
1129 | .d_revalidate = pid_revalidate, | |
1130 | .d_delete = pid_delete_dentry, | |
1131 | }; | |
1132 | ||
1133 | /* Lookups */ | |
1134 | ||
1135 | static unsigned name_to_int(struct dentry *dentry) | |
1136 | { | |
1137 | const char *name = dentry->d_name.name; | |
1138 | int len = dentry->d_name.len; | |
1139 | unsigned n = 0; | |
1140 | ||
1141 | if (len > 1 && *name == '0') | |
1142 | goto out; | |
1143 | while (len-- > 0) { | |
1144 | unsigned c = *name++ - '0'; | |
1145 | if (c > 9) | |
1146 | goto out; | |
1147 | if (n >= (~0U-9)/10) | |
1148 | goto out; | |
1149 | n *= 10; | |
1150 | n += c; | |
1151 | } | |
1152 | return n; | |
1153 | out: | |
1154 | return ~0U; | |
1155 | } | |
1156 | ||
1157 | static int proc_fd_link(struct inode *inode, struct dentry **dentry, struct vfsmount **mnt) | |
1158 | { | |
1159 | struct task_struct *task = get_proc_task(inode); | |
1160 | struct files_struct *files = NULL; | |
1161 | struct file *file; | |
1162 | int fd = proc_fd(inode); | |
99f89551 | 1163 | |
99f89551 | 1164 | if (task) { |
28a6d671 EB |
1165 | files = get_files_struct(task); |
1166 | put_task_struct(task); | |
1167 | } | |
1168 | if (files) { | |
1169 | /* | |
1170 | * We are not taking a ref to the file structure, so we must | |
1171 | * hold ->file_lock. | |
1172 | */ | |
1173 | spin_lock(&files->file_lock); | |
1174 | file = fcheck_files(files, fd); | |
1175 | if (file) { | |
1176 | *mnt = mntget(file->f_vfsmnt); | |
1177 | *dentry = dget(file->f_dentry); | |
1178 | spin_unlock(&files->file_lock); | |
1179 | put_files_struct(files); | |
1180 | return 0; | |
99f89551 | 1181 | } |
28a6d671 EB |
1182 | spin_unlock(&files->file_lock); |
1183 | put_files_struct(files); | |
99f89551 | 1184 | } |
28a6d671 | 1185 | return -ENOENT; |
99f89551 EB |
1186 | } |
1187 | ||
1da177e4 LT |
1188 | static int tid_fd_revalidate(struct dentry *dentry, struct nameidata *nd) |
1189 | { | |
1190 | struct inode *inode = dentry->d_inode; | |
99f89551 | 1191 | struct task_struct *task = get_proc_task(inode); |
aed7a6c4 | 1192 | int fd = proc_fd(inode); |
1da177e4 LT |
1193 | struct files_struct *files; |
1194 | ||
99f89551 EB |
1195 | if (task) { |
1196 | files = get_files_struct(task); | |
1197 | if (files) { | |
1198 | rcu_read_lock(); | |
1199 | if (fcheck_files(files, fd)) { | |
1200 | rcu_read_unlock(); | |
1201 | put_files_struct(files); | |
1202 | if (task_dumpable(task)) { | |
1203 | inode->i_uid = task->euid; | |
1204 | inode->i_gid = task->egid; | |
1205 | } else { | |
1206 | inode->i_uid = 0; | |
1207 | inode->i_gid = 0; | |
1208 | } | |
9ee8ab9f | 1209 | inode->i_mode &= ~(S_ISUID | S_ISGID); |
99f89551 EB |
1210 | security_task_to_inode(task, inode); |
1211 | put_task_struct(task); | |
1212 | return 1; | |
1213 | } | |
b835996f | 1214 | rcu_read_unlock(); |
1da177e4 | 1215 | put_files_struct(files); |
1da177e4 | 1216 | } |
99f89551 | 1217 | put_task_struct(task); |
1da177e4 LT |
1218 | } |
1219 | d_drop(dentry); | |
1220 | return 0; | |
1221 | } | |
1222 | ||
1da177e4 LT |
1223 | static struct dentry_operations tid_fd_dentry_operations = |
1224 | { | |
1225 | .d_revalidate = tid_fd_revalidate, | |
1226 | .d_delete = pid_delete_dentry, | |
1227 | }; | |
1228 | ||
1da177e4 LT |
1229 | /* SMP-safe */ |
1230 | static struct dentry *proc_lookupfd(struct inode * dir, struct dentry * dentry, struct nameidata *nd) | |
1231 | { | |
99f89551 | 1232 | struct task_struct *task = get_proc_task(dir); |
1da177e4 | 1233 | unsigned fd = name_to_int(dentry); |
cd6a3ce9 | 1234 | struct dentry *result = ERR_PTR(-ENOENT); |
1da177e4 LT |
1235 | struct file * file; |
1236 | struct files_struct * files; | |
1237 | struct inode *inode; | |
1238 | struct proc_inode *ei; | |
1239 | ||
99f89551 EB |
1240 | if (!task) |
1241 | goto out_no_task; | |
1da177e4 LT |
1242 | if (fd == ~0U) |
1243 | goto out; | |
1da177e4 LT |
1244 | |
1245 | inode = proc_pid_make_inode(dir->i_sb, task, PROC_TID_FD_DIR+fd); | |
1246 | if (!inode) | |
1247 | goto out; | |
1248 | ei = PROC_I(inode); | |
aed7a6c4 | 1249 | ei->fd = fd; |
1da177e4 LT |
1250 | files = get_files_struct(task); |
1251 | if (!files) | |
1252 | goto out_unlock; | |
1253 | inode->i_mode = S_IFLNK; | |
ca99c1da DS |
1254 | |
1255 | /* | |
1256 | * We are not taking a ref to the file structure, so we must | |
1257 | * hold ->file_lock. | |
1258 | */ | |
1259 | spin_lock(&files->file_lock); | |
1da177e4 LT |
1260 | file = fcheck_files(files, fd); |
1261 | if (!file) | |
1262 | goto out_unlock2; | |
1263 | if (file->f_mode & 1) | |
1264 | inode->i_mode |= S_IRUSR | S_IXUSR; | |
1265 | if (file->f_mode & 2) | |
1266 | inode->i_mode |= S_IWUSR | S_IXUSR; | |
ca99c1da | 1267 | spin_unlock(&files->file_lock); |
1da177e4 LT |
1268 | put_files_struct(files); |
1269 | inode->i_op = &proc_pid_link_inode_operations; | |
1270 | inode->i_size = 64; | |
1271 | ei->op.proc_get_link = proc_fd_link; | |
1272 | dentry->d_op = &tid_fd_dentry_operations; | |
1273 | d_add(dentry, inode); | |
cd6a3ce9 EB |
1274 | /* Close the race of the process dying before we return the dentry */ |
1275 | if (tid_fd_revalidate(dentry, NULL)) | |
1276 | result = NULL; | |
1277 | out: | |
99f89551 EB |
1278 | put_task_struct(task); |
1279 | out_no_task: | |
cd6a3ce9 | 1280 | return result; |
1da177e4 LT |
1281 | |
1282 | out_unlock2: | |
ca99c1da | 1283 | spin_unlock(&files->file_lock); |
1da177e4 LT |
1284 | put_files_struct(files); |
1285 | out_unlock: | |
1286 | iput(inode); | |
cd6a3ce9 | 1287 | goto out; |
1da177e4 LT |
1288 | } |
1289 | ||
28a6d671 EB |
1290 | static int proc_readfd(struct file * filp, void * dirent, filldir_t filldir) |
1291 | { | |
1292 | struct dentry *dentry = filp->f_dentry; | |
1293 | struct inode *inode = dentry->d_inode; | |
1294 | struct task_struct *p = get_proc_task(inode); | |
1295 | unsigned int fd, tid, ino; | |
1296 | int retval; | |
1297 | char buf[PROC_NUMBUF]; | |
1298 | struct files_struct * files; | |
1299 | struct fdtable *fdt; | |
1da177e4 | 1300 | |
28a6d671 EB |
1301 | retval = -ENOENT; |
1302 | if (!p) | |
1303 | goto out_no_task; | |
1304 | retval = 0; | |
1305 | tid = p->pid; | |
1306 | ||
1307 | fd = filp->f_pos; | |
1308 | switch (fd) { | |
1309 | case 0: | |
1310 | if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0) | |
1311 | goto out; | |
1312 | filp->f_pos++; | |
1313 | case 1: | |
1314 | ino = parent_ino(dentry); | |
1315 | if (filldir(dirent, "..", 2, 1, ino, DT_DIR) < 0) | |
1316 | goto out; | |
1317 | filp->f_pos++; | |
1318 | default: | |
1319 | files = get_files_struct(p); | |
1320 | if (!files) | |
1321 | goto out; | |
1322 | rcu_read_lock(); | |
1323 | fdt = files_fdtable(files); | |
1324 | for (fd = filp->f_pos-2; | |
1325 | fd < fdt->max_fds; | |
1326 | fd++, filp->f_pos++) { | |
1327 | unsigned int i,j; | |
1328 | ||
1329 | if (!fcheck_files(files, fd)) | |
1330 | continue; | |
1331 | rcu_read_unlock(); | |
1332 | ||
1333 | j = PROC_NUMBUF; | |
1334 | i = fd; | |
1335 | do { | |
1336 | j--; | |
1337 | buf[j] = '0' + (i % 10); | |
1338 | i /= 10; | |
1339 | } while (i); | |
1340 | ||
1341 | ino = fake_ino(tid, PROC_TID_FD_DIR + fd); | |
1342 | if (filldir(dirent, buf+j, PROC_NUMBUF-j, fd+2, ino, DT_LNK) < 0) { | |
1343 | rcu_read_lock(); | |
1344 | break; | |
1345 | } | |
1346 | rcu_read_lock(); | |
1347 | } | |
1348 | rcu_read_unlock(); | |
1349 | put_files_struct(files); | |
1350 | } | |
1351 | out: | |
1352 | put_task_struct(p); | |
1353 | out_no_task: | |
1354 | return retval; | |
1355 | } | |
1356 | ||
1357 | static struct file_operations proc_fd_operations = { | |
1358 | .read = generic_read_dir, | |
1359 | .readdir = proc_readfd, | |
1da177e4 LT |
1360 | }; |
1361 | ||
1362 | /* | |
1363 | * proc directories can do almost nothing.. | |
1364 | */ | |
1365 | static struct inode_operations proc_fd_inode_operations = { | |
1366 | .lookup = proc_lookupfd, | |
6d76fa58 | 1367 | .setattr = proc_setattr, |
1da177e4 LT |
1368 | }; |
1369 | ||
28a6d671 EB |
1370 | static struct file_operations proc_task_operations; |
1371 | static struct inode_operations proc_task_inode_operations; | |
1da177e4 LT |
1372 | |
1373 | #ifdef CONFIG_SECURITY | |
28a6d671 | 1374 | static struct file_operations proc_pid_attr_operations; |
1da177e4 LT |
1375 | static struct file_operations proc_tid_attr_operations; |
1376 | static struct inode_operations proc_tid_attr_inode_operations; | |
1377 | static struct file_operations proc_tgid_attr_operations; | |
1378 | static struct inode_operations proc_tgid_attr_inode_operations; | |
1379 | #endif | |
1380 | ||
1381 | /* SMP-safe */ | |
1382 | static struct dentry *proc_pident_lookup(struct inode *dir, | |
1383 | struct dentry *dentry, | |
1384 | struct pid_entry *ents) | |
1385 | { | |
1386 | struct inode *inode; | |
cd6a3ce9 | 1387 | struct dentry *error; |
99f89551 | 1388 | struct task_struct *task = get_proc_task(dir); |
1da177e4 LT |
1389 | struct pid_entry *p; |
1390 | struct proc_inode *ei; | |
1391 | ||
cd6a3ce9 | 1392 | error = ERR_PTR(-ENOENT); |
1da177e4 LT |
1393 | inode = NULL; |
1394 | ||
99f89551 EB |
1395 | if (!task) |
1396 | goto out_no_task; | |
1da177e4 LT |
1397 | |
1398 | for (p = ents; p->name; p++) { | |
1399 | if (p->len != dentry->d_name.len) | |
1400 | continue; | |
1401 | if (!memcmp(dentry->d_name.name, p->name, p->len)) | |
1402 | break; | |
1403 | } | |
1404 | if (!p->name) | |
1405 | goto out; | |
1406 | ||
cd6a3ce9 | 1407 | error = ERR_PTR(-EINVAL); |
1da177e4 LT |
1408 | inode = proc_pid_make_inode(dir->i_sb, task, p->type); |
1409 | if (!inode) | |
1410 | goto out; | |
1411 | ||
1412 | ei = PROC_I(inode); | |
1413 | inode->i_mode = p->mode; | |
1414 | /* | |
1415 | * Yes, it does not scale. And it should not. Don't add | |
1416 | * new entries into /proc/<tgid>/ without very good reasons. | |
1417 | */ | |
1418 | switch(p->type) { | |
1419 | case PROC_TGID_TASK: | |
6e66b52b | 1420 | inode->i_nlink = 2; |
1da177e4 LT |
1421 | inode->i_op = &proc_task_inode_operations; |
1422 | inode->i_fop = &proc_task_operations; | |
1423 | break; | |
1424 | case PROC_TID_FD: | |
1425 | case PROC_TGID_FD: | |
1426 | inode->i_nlink = 2; | |
1427 | inode->i_op = &proc_fd_inode_operations; | |
1428 | inode->i_fop = &proc_fd_operations; | |
1429 | break; | |
1430 | case PROC_TID_EXE: | |
1431 | case PROC_TGID_EXE: | |
1432 | inode->i_op = &proc_pid_link_inode_operations; | |
1433 | ei->op.proc_get_link = proc_exe_link; | |
1434 | break; | |
1435 | case PROC_TID_CWD: | |
1436 | case PROC_TGID_CWD: | |
1437 | inode->i_op = &proc_pid_link_inode_operations; | |
1438 | ei->op.proc_get_link = proc_cwd_link; | |
1439 | break; | |
1440 | case PROC_TID_ROOT: | |
1441 | case PROC_TGID_ROOT: | |
1442 | inode->i_op = &proc_pid_link_inode_operations; | |
1443 | ei->op.proc_get_link = proc_root_link; | |
1444 | break; | |
1445 | case PROC_TID_ENVIRON: | |
1446 | case PROC_TGID_ENVIRON: | |
1447 | inode->i_fop = &proc_info_file_operations; | |
1448 | ei->op.proc_read = proc_pid_environ; | |
1449 | break; | |
1450 | case PROC_TID_AUXV: | |
1451 | case PROC_TGID_AUXV: | |
1452 | inode->i_fop = &proc_info_file_operations; | |
1453 | ei->op.proc_read = proc_pid_auxv; | |
1454 | break; | |
1455 | case PROC_TID_STATUS: | |
1456 | case PROC_TGID_STATUS: | |
1457 | inode->i_fop = &proc_info_file_operations; | |
1458 | ei->op.proc_read = proc_pid_status; | |
1459 | break; | |
1460 | case PROC_TID_STAT: | |
1461 | inode->i_fop = &proc_info_file_operations; | |
1462 | ei->op.proc_read = proc_tid_stat; | |
1463 | break; | |
1464 | case PROC_TGID_STAT: | |
1465 | inode->i_fop = &proc_info_file_operations; | |
1466 | ei->op.proc_read = proc_tgid_stat; | |
1467 | break; | |
1468 | case PROC_TID_CMDLINE: | |
1469 | case PROC_TGID_CMDLINE: | |
1470 | inode->i_fop = &proc_info_file_operations; | |
1471 | ei->op.proc_read = proc_pid_cmdline; | |
1472 | break; | |
1473 | case PROC_TID_STATM: | |
1474 | case PROC_TGID_STATM: | |
1475 | inode->i_fop = &proc_info_file_operations; | |
1476 | ei->op.proc_read = proc_pid_statm; | |
1477 | break; | |
1478 | case PROC_TID_MAPS: | |
1479 | case PROC_TGID_MAPS: | |
1480 | inode->i_fop = &proc_maps_operations; | |
1481 | break; | |
6e21c8f1 CL |
1482 | #ifdef CONFIG_NUMA |
1483 | case PROC_TID_NUMA_MAPS: | |
1484 | case PROC_TGID_NUMA_MAPS: | |
1485 | inode->i_fop = &proc_numa_maps_operations; | |
1486 | break; | |
1487 | #endif | |
1da177e4 LT |
1488 | case PROC_TID_MEM: |
1489 | case PROC_TGID_MEM: | |
1da177e4 LT |
1490 | inode->i_fop = &proc_mem_operations; |
1491 | break; | |
1492 | #ifdef CONFIG_SECCOMP | |
1493 | case PROC_TID_SECCOMP: | |
1494 | case PROC_TGID_SECCOMP: | |
1495 | inode->i_fop = &proc_seccomp_operations; | |
1496 | break; | |
1497 | #endif /* CONFIG_SECCOMP */ | |
1498 | case PROC_TID_MOUNTS: | |
1499 | case PROC_TGID_MOUNTS: | |
1500 | inode->i_fop = &proc_mounts_operations; | |
1501 | break; | |
63c6764c | 1502 | #ifdef CONFIG_MMU |
e070ad49 ML |
1503 | case PROC_TID_SMAPS: |
1504 | case PROC_TGID_SMAPS: | |
1505 | inode->i_fop = &proc_smaps_operations; | |
1506 | break; | |
63c6764c | 1507 | #endif |
b4629fe2 CL |
1508 | case PROC_TID_MOUNTSTATS: |
1509 | case PROC_TGID_MOUNTSTATS: | |
1510 | inode->i_fop = &proc_mountstats_operations; | |
1511 | break; | |
1da177e4 LT |
1512 | #ifdef CONFIG_SECURITY |
1513 | case PROC_TID_ATTR: | |
1514 | inode->i_nlink = 2; | |
1515 | inode->i_op = &proc_tid_attr_inode_operations; | |
1516 | inode->i_fop = &proc_tid_attr_operations; | |
1517 | break; | |
1518 | case PROC_TGID_ATTR: | |
1519 | inode->i_nlink = 2; | |
1520 | inode->i_op = &proc_tgid_attr_inode_operations; | |
1521 | inode->i_fop = &proc_tgid_attr_operations; | |
1522 | break; | |
1523 | case PROC_TID_ATTR_CURRENT: | |
1524 | case PROC_TGID_ATTR_CURRENT: | |
1525 | case PROC_TID_ATTR_PREV: | |
1526 | case PROC_TGID_ATTR_PREV: | |
1527 | case PROC_TID_ATTR_EXEC: | |
1528 | case PROC_TGID_ATTR_EXEC: | |
1529 | case PROC_TID_ATTR_FSCREATE: | |
1530 | case PROC_TGID_ATTR_FSCREATE: | |
4eb582cf ML |
1531 | case PROC_TID_ATTR_KEYCREATE: |
1532 | case PROC_TGID_ATTR_KEYCREATE: | |
42c3e03e EP |
1533 | case PROC_TID_ATTR_SOCKCREATE: |
1534 | case PROC_TGID_ATTR_SOCKCREATE: | |
1da177e4 LT |
1535 | inode->i_fop = &proc_pid_attr_operations; |
1536 | break; | |
1537 | #endif | |
1538 | #ifdef CONFIG_KALLSYMS | |
1539 | case PROC_TID_WCHAN: | |
1540 | case PROC_TGID_WCHAN: | |
1541 | inode->i_fop = &proc_info_file_operations; | |
1542 | ei->op.proc_read = proc_pid_wchan; | |
1543 | break; | |
1544 | #endif | |
1545 | #ifdef CONFIG_SCHEDSTATS | |
1546 | case PROC_TID_SCHEDSTAT: | |
1547 | case PROC_TGID_SCHEDSTAT: | |
1548 | inode->i_fop = &proc_info_file_operations; | |
1549 | ei->op.proc_read = proc_pid_schedstat; | |
1550 | break; | |
1551 | #endif | |
1552 | #ifdef CONFIG_CPUSETS | |
1553 | case PROC_TID_CPUSET: | |
1554 | case PROC_TGID_CPUSET: | |
1555 | inode->i_fop = &proc_cpuset_operations; | |
1556 | break; | |
1557 | #endif | |
1558 | case PROC_TID_OOM_SCORE: | |
1559 | case PROC_TGID_OOM_SCORE: | |
1560 | inode->i_fop = &proc_info_file_operations; | |
1561 | ei->op.proc_read = proc_oom_score; | |
1562 | break; | |
1563 | case PROC_TID_OOM_ADJUST: | |
1564 | case PROC_TGID_OOM_ADJUST: | |
1565 | inode->i_fop = &proc_oom_adjust_operations; | |
1566 | break; | |
1567 | #ifdef CONFIG_AUDITSYSCALL | |
1568 | case PROC_TID_LOGINUID: | |
1569 | case PROC_TGID_LOGINUID: | |
1570 | inode->i_fop = &proc_loginuid_operations; | |
1571 | break; | |
1572 | #endif | |
1573 | default: | |
1574 | printk("procfs: impossible type (%d)",p->type); | |
1575 | iput(inode); | |
cd6a3ce9 EB |
1576 | error = ERR_PTR(-EINVAL); |
1577 | goto out; | |
1da177e4 LT |
1578 | } |
1579 | dentry->d_op = &pid_dentry_operations; | |
1580 | d_add(dentry, inode); | |
cd6a3ce9 EB |
1581 | /* Close the race of the process dying before we return the dentry */ |
1582 | if (pid_revalidate(dentry, NULL)) | |
1583 | error = NULL; | |
1da177e4 | 1584 | out: |
99f89551 EB |
1585 | put_task_struct(task); |
1586 | out_no_task: | |
cd6a3ce9 | 1587 | return error; |
1da177e4 LT |
1588 | } |
1589 | ||
28a6d671 EB |
1590 | static int proc_pident_readdir(struct file *filp, |
1591 | void *dirent, filldir_t filldir, | |
1592 | struct pid_entry *ents, unsigned int nents) | |
1593 | { | |
1594 | int i; | |
1595 | int pid; | |
1596 | struct dentry *dentry = filp->f_dentry; | |
1597 | struct inode *inode = dentry->d_inode; | |
1598 | struct task_struct *task = get_proc_task(inode); | |
1599 | struct pid_entry *p; | |
1600 | ino_t ino; | |
1601 | int ret; | |
1602 | ||
1603 | ret = -ENOENT; | |
1604 | if (!task) | |
1605 | goto out; | |
1606 | ||
1607 | ret = 0; | |
1608 | pid = task->pid; | |
1609 | put_task_struct(task); | |
1610 | i = filp->f_pos; | |
1611 | switch (i) { | |
1612 | case 0: | |
1613 | ino = inode->i_ino; | |
1614 | if (filldir(dirent, ".", 1, i, ino, DT_DIR) < 0) | |
1615 | goto out; | |
1616 | i++; | |
1617 | filp->f_pos++; | |
1618 | /* fall through */ | |
1619 | case 1: | |
1620 | ino = parent_ino(dentry); | |
1621 | if (filldir(dirent, "..", 2, i, ino, DT_DIR) < 0) | |
1622 | goto out; | |
1623 | i++; | |
1624 | filp->f_pos++; | |
1625 | /* fall through */ | |
1626 | default: | |
1627 | i -= 2; | |
1628 | if (i >= nents) { | |
1629 | ret = 1; | |
1630 | goto out; | |
1631 | } | |
1632 | p = ents + i; | |
1633 | while (p->name) { | |
1634 | if (filldir(dirent, p->name, p->len, filp->f_pos, | |
1635 | fake_ino(pid, p->type), p->mode >> 12) < 0) | |
1636 | goto out; | |
1637 | filp->f_pos++; | |
1638 | p++; | |
1639 | } | |
1640 | } | |
1641 | ||
1642 | ret = 1; | |
1643 | out: | |
1644 | return ret; | |
1da177e4 LT |
1645 | } |
1646 | ||
28a6d671 EB |
1647 | #ifdef CONFIG_SECURITY |
1648 | static ssize_t proc_pid_attr_read(struct file * file, char __user * buf, | |
1649 | size_t count, loff_t *ppos) | |
1650 | { | |
1651 | struct inode * inode = file->f_dentry->d_inode; | |
1652 | unsigned long page; | |
1653 | ssize_t length; | |
1654 | struct task_struct *task = get_proc_task(inode); | |
1655 | ||
1656 | length = -ESRCH; | |
1657 | if (!task) | |
1658 | goto out_no_task; | |
1659 | ||
1660 | if (count > PAGE_SIZE) | |
1661 | count = PAGE_SIZE; | |
1662 | length = -ENOMEM; | |
1663 | if (!(page = __get_free_page(GFP_KERNEL))) | |
1664 | goto out; | |
1665 | ||
1666 | length = security_getprocattr(task, | |
1667 | (char*)file->f_dentry->d_name.name, | |
1668 | (void*)page, count); | |
1669 | if (length >= 0) | |
1670 | length = simple_read_from_buffer(buf, count, ppos, (char *)page, length); | |
1671 | free_page(page); | |
1672 | out: | |
1673 | put_task_struct(task); | |
1674 | out_no_task: | |
1675 | return length; | |
1da177e4 LT |
1676 | } |
1677 | ||
28a6d671 EB |
1678 | static ssize_t proc_pid_attr_write(struct file * file, const char __user * buf, |
1679 | size_t count, loff_t *ppos) | |
1680 | { | |
1681 | struct inode * inode = file->f_dentry->d_inode; | |
1682 | char *page; | |
1683 | ssize_t length; | |
1684 | struct task_struct *task = get_proc_task(inode); | |
1685 | ||
1686 | length = -ESRCH; | |
1687 | if (!task) | |
1688 | goto out_no_task; | |
1689 | if (count > PAGE_SIZE) | |
1690 | count = PAGE_SIZE; | |
1691 | ||
1692 | /* No partial writes. */ | |
1693 | length = -EINVAL; | |
1694 | if (*ppos != 0) | |
1695 | goto out; | |
1696 | ||
1697 | length = -ENOMEM; | |
1698 | page = (char*)__get_free_page(GFP_USER); | |
1699 | if (!page) | |
1700 | goto out; | |
1701 | ||
1702 | length = -EFAULT; | |
1703 | if (copy_from_user(page, buf, count)) | |
1704 | goto out_free; | |
1705 | ||
1706 | length = security_setprocattr(task, | |
1707 | (char*)file->f_dentry->d_name.name, | |
1708 | (void*)page, count); | |
1709 | out_free: | |
1710 | free_page((unsigned long) page); | |
1711 | out: | |
1712 | put_task_struct(task); | |
1713 | out_no_task: | |
1714 | return length; | |
1715 | } | |
1716 | ||
1717 | static struct file_operations proc_pid_attr_operations = { | |
1718 | .read = proc_pid_attr_read, | |
1719 | .write = proc_pid_attr_write, | |
1720 | }; | |
1721 | ||
1722 | static struct pid_entry tgid_attr_stuff[] = { | |
1723 | E(PROC_TGID_ATTR_CURRENT, "current", S_IFREG|S_IRUGO|S_IWUGO), | |
1724 | E(PROC_TGID_ATTR_PREV, "prev", S_IFREG|S_IRUGO), | |
1725 | E(PROC_TGID_ATTR_EXEC, "exec", S_IFREG|S_IRUGO|S_IWUGO), | |
1726 | E(PROC_TGID_ATTR_FSCREATE, "fscreate", S_IFREG|S_IRUGO|S_IWUGO), | |
1727 | E(PROC_TGID_ATTR_KEYCREATE, "keycreate", S_IFREG|S_IRUGO|S_IWUGO), | |
1728 | E(PROC_TGID_ATTR_SOCKCREATE, "sockcreate", S_IFREG|S_IRUGO|S_IWUGO), | |
1729 | {0,0,NULL,0} | |
1730 | }; | |
1731 | static struct pid_entry tid_attr_stuff[] = { | |
1732 | E(PROC_TID_ATTR_CURRENT, "current", S_IFREG|S_IRUGO|S_IWUGO), | |
1733 | E(PROC_TID_ATTR_PREV, "prev", S_IFREG|S_IRUGO), | |
1734 | E(PROC_TID_ATTR_EXEC, "exec", S_IFREG|S_IRUGO|S_IWUGO), | |
1735 | E(PROC_TID_ATTR_FSCREATE, "fscreate", S_IFREG|S_IRUGO|S_IWUGO), | |
1736 | E(PROC_TID_ATTR_KEYCREATE, "keycreate", S_IFREG|S_IRUGO|S_IWUGO), | |
1737 | E(PROC_TID_ATTR_SOCKCREATE, "sockcreate", S_IFREG|S_IRUGO|S_IWUGO), | |
1738 | {0,0,NULL,0} | |
1739 | }; | |
1740 | ||
1741 | static int proc_tgid_attr_readdir(struct file * filp, | |
1742 | void * dirent, filldir_t filldir) | |
1743 | { | |
1744 | return proc_pident_readdir(filp,dirent,filldir, | |
1745 | tgid_attr_stuff,ARRAY_SIZE(tgid_attr_stuff)); | |
1746 | } | |
1747 | ||
1748 | static int proc_tid_attr_readdir(struct file * filp, | |
1749 | void * dirent, filldir_t filldir) | |
1750 | { | |
1751 | return proc_pident_readdir(filp,dirent,filldir, | |
1752 | tid_attr_stuff,ARRAY_SIZE(tid_attr_stuff)); | |
1753 | } | |
1754 | ||
1755 | static struct file_operations proc_tgid_attr_operations = { | |
1da177e4 | 1756 | .read = generic_read_dir, |
28a6d671 | 1757 | .readdir = proc_tgid_attr_readdir, |
1da177e4 LT |
1758 | }; |
1759 | ||
28a6d671 | 1760 | static struct file_operations proc_tid_attr_operations = { |
1da177e4 | 1761 | .read = generic_read_dir, |
28a6d671 | 1762 | .readdir = proc_tid_attr_readdir, |
1da177e4 LT |
1763 | }; |
1764 | ||
28a6d671 EB |
1765 | static struct dentry *proc_tgid_attr_lookup(struct inode *dir, |
1766 | struct dentry *dentry, struct nameidata *nd) | |
1767 | { | |
1768 | return proc_pident_lookup(dir, dentry, tgid_attr_stuff); | |
1769 | } | |
1770 | ||
1771 | static struct dentry *proc_tid_attr_lookup(struct inode *dir, | |
1772 | struct dentry *dentry, struct nameidata *nd) | |
1773 | { | |
1774 | return proc_pident_lookup(dir, dentry, tid_attr_stuff); | |
1775 | } | |
1776 | ||
1777 | static struct inode_operations proc_tgid_attr_inode_operations = { | |
1778 | .lookup = proc_tgid_attr_lookup, | |
99f89551 | 1779 | .getattr = pid_getattr, |
6d76fa58 | 1780 | .setattr = proc_setattr, |
1da177e4 LT |
1781 | }; |
1782 | ||
28a6d671 EB |
1783 | static struct inode_operations proc_tid_attr_inode_operations = { |
1784 | .lookup = proc_tid_attr_lookup, | |
99f89551 | 1785 | .getattr = pid_getattr, |
6d76fa58 | 1786 | .setattr = proc_setattr, |
1da177e4 | 1787 | }; |
28a6d671 EB |
1788 | #endif |
1789 | ||
1790 | /* | |
1791 | * /proc/self: | |
1792 | */ | |
1793 | static int proc_self_readlink(struct dentry *dentry, char __user *buffer, | |
1794 | int buflen) | |
1795 | { | |
1796 | char tmp[PROC_NUMBUF]; | |
1797 | sprintf(tmp, "%d", current->tgid); | |
1798 | return vfs_readlink(dentry,buffer,buflen,tmp); | |
1799 | } | |
1800 | ||
1801 | static void *proc_self_follow_link(struct dentry *dentry, struct nameidata *nd) | |
1802 | { | |
1803 | char tmp[PROC_NUMBUF]; | |
1804 | sprintf(tmp, "%d", current->tgid); | |
1805 | return ERR_PTR(vfs_follow_link(nd,tmp)); | |
1806 | } | |
1807 | ||
1808 | static struct inode_operations proc_self_inode_operations = { | |
1809 | .readlink = proc_self_readlink, | |
1810 | .follow_link = proc_self_follow_link, | |
1811 | }; | |
1812 | ||
1813 | /* | |
1814 | * Thread groups | |
1815 | */ | |
1816 | static struct pid_entry tgid_base_stuff[] = { | |
1817 | E(PROC_TGID_TASK, "task", S_IFDIR|S_IRUGO|S_IXUGO), | |
1818 | E(PROC_TGID_FD, "fd", S_IFDIR|S_IRUSR|S_IXUSR), | |
1819 | E(PROC_TGID_ENVIRON, "environ", S_IFREG|S_IRUSR), | |
1820 | E(PROC_TGID_AUXV, "auxv", S_IFREG|S_IRUSR), | |
1821 | E(PROC_TGID_STATUS, "status", S_IFREG|S_IRUGO), | |
1822 | E(PROC_TGID_CMDLINE, "cmdline", S_IFREG|S_IRUGO), | |
1823 | E(PROC_TGID_STAT, "stat", S_IFREG|S_IRUGO), | |
1824 | E(PROC_TGID_STATM, "statm", S_IFREG|S_IRUGO), | |
1825 | E(PROC_TGID_MAPS, "maps", S_IFREG|S_IRUGO), | |
1826 | #ifdef CONFIG_NUMA | |
1827 | E(PROC_TGID_NUMA_MAPS, "numa_maps", S_IFREG|S_IRUGO), | |
1828 | #endif | |
1829 | E(PROC_TGID_MEM, "mem", S_IFREG|S_IRUSR|S_IWUSR), | |
1830 | #ifdef CONFIG_SECCOMP | |
1831 | E(PROC_TGID_SECCOMP, "seccomp", S_IFREG|S_IRUSR|S_IWUSR), | |
1832 | #endif | |
1833 | E(PROC_TGID_CWD, "cwd", S_IFLNK|S_IRWXUGO), | |
1834 | E(PROC_TGID_ROOT, "root", S_IFLNK|S_IRWXUGO), | |
1835 | E(PROC_TGID_EXE, "exe", S_IFLNK|S_IRWXUGO), | |
1836 | E(PROC_TGID_MOUNTS, "mounts", S_IFREG|S_IRUGO), | |
1837 | E(PROC_TGID_MOUNTSTATS, "mountstats", S_IFREG|S_IRUSR), | |
1838 | #ifdef CONFIG_MMU | |
1839 | E(PROC_TGID_SMAPS, "smaps", S_IFREG|S_IRUGO), | |
1840 | #endif | |
1841 | #ifdef CONFIG_SECURITY | |
1842 | E(PROC_TGID_ATTR, "attr", S_IFDIR|S_IRUGO|S_IXUGO), | |
1843 | #endif | |
1844 | #ifdef CONFIG_KALLSYMS | |
1845 | E(PROC_TGID_WCHAN, "wchan", S_IFREG|S_IRUGO), | |
1846 | #endif | |
1847 | #ifdef CONFIG_SCHEDSTATS | |
1848 | E(PROC_TGID_SCHEDSTAT, "schedstat", S_IFREG|S_IRUGO), | |
1849 | #endif | |
1850 | #ifdef CONFIG_CPUSETS | |
1851 | E(PROC_TGID_CPUSET, "cpuset", S_IFREG|S_IRUGO), | |
1852 | #endif | |
1853 | E(PROC_TGID_OOM_SCORE, "oom_score",S_IFREG|S_IRUGO), | |
1854 | E(PROC_TGID_OOM_ADJUST,"oom_adj", S_IFREG|S_IRUGO|S_IWUSR), | |
1855 | #ifdef CONFIG_AUDITSYSCALL | |
1856 | E(PROC_TGID_LOGINUID, "loginuid", S_IFREG|S_IWUSR|S_IRUGO), | |
1857 | #endif | |
1858 | {0,0,NULL,0} | |
1859 | }; | |
1da177e4 | 1860 | |
28a6d671 | 1861 | static int proc_tgid_base_readdir(struct file * filp, |
1da177e4 LT |
1862 | void * dirent, filldir_t filldir) |
1863 | { | |
1864 | return proc_pident_readdir(filp,dirent,filldir, | |
28a6d671 | 1865 | tgid_base_stuff,ARRAY_SIZE(tgid_base_stuff)); |
1da177e4 LT |
1866 | } |
1867 | ||
28a6d671 | 1868 | static struct file_operations proc_tgid_base_operations = { |
1da177e4 | 1869 | .read = generic_read_dir, |
28a6d671 | 1870 | .readdir = proc_tgid_base_readdir, |
1da177e4 LT |
1871 | }; |
1872 | ||
28a6d671 EB |
1873 | static struct dentry *proc_tgid_base_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd){ |
1874 | return proc_pident_lookup(dir, dentry, tgid_base_stuff); | |
1da177e4 LT |
1875 | } |
1876 | ||
28a6d671 EB |
1877 | static struct inode_operations proc_tgid_base_inode_operations = { |
1878 | .lookup = proc_tgid_base_lookup, | |
99f89551 | 1879 | .getattr = pid_getattr, |
6d76fa58 | 1880 | .setattr = proc_setattr, |
1da177e4 | 1881 | }; |
1da177e4 LT |
1882 | |
1883 | /** | |
48e6484d EB |
1884 | * proc_flush_task - Remove dcache entries for @task from the /proc dcache. |
1885 | * | |
1886 | * @task: task that should be flushed. | |
1887 | * | |
1888 | * Looks in the dcache for | |
1889 | * /proc/@pid | |
1890 | * /proc/@tgid/task/@pid | |
1891 | * if either directory is present flushes it and all of it'ts children | |
1892 | * from the dcache. | |
1da177e4 | 1893 | * |
48e6484d EB |
1894 | * It is safe and reasonable to cache /proc entries for a task until |
1895 | * that task exits. After that they just clog up the dcache with | |
1896 | * useless entries, possibly causing useful dcache entries to be | |
1897 | * flushed instead. This routine is proved to flush those useless | |
1898 | * dcache entries at process exit time. | |
1da177e4 | 1899 | * |
48e6484d EB |
1900 | * NOTE: This routine is just an optimization so it does not guarantee |
1901 | * that no dcache entries will exist at process exit time it | |
1902 | * just makes it very unlikely that any will persist. | |
1da177e4 | 1903 | */ |
48e6484d | 1904 | void proc_flush_task(struct task_struct *task) |
1da177e4 | 1905 | { |
48e6484d | 1906 | struct dentry *dentry, *leader, *dir; |
8578cea7 | 1907 | char buf[PROC_NUMBUF]; |
48e6484d EB |
1908 | struct qstr name; |
1909 | ||
1910 | name.name = buf; | |
1911 | name.len = snprintf(buf, sizeof(buf), "%d", task->pid); | |
1912 | dentry = d_hash_and_lookup(proc_mnt->mnt_root, &name); | |
1913 | if (dentry) { | |
1914 | shrink_dcache_parent(dentry); | |
1915 | d_drop(dentry); | |
1916 | dput(dentry); | |
1917 | } | |
1da177e4 | 1918 | |
48e6484d EB |
1919 | if (thread_group_leader(task)) |
1920 | goto out; | |
1da177e4 | 1921 | |
48e6484d EB |
1922 | name.name = buf; |
1923 | name.len = snprintf(buf, sizeof(buf), "%d", task->tgid); | |
1924 | leader = d_hash_and_lookup(proc_mnt->mnt_root, &name); | |
1925 | if (!leader) | |
1926 | goto out; | |
1da177e4 | 1927 | |
48e6484d EB |
1928 | name.name = "task"; |
1929 | name.len = strlen(name.name); | |
1930 | dir = d_hash_and_lookup(leader, &name); | |
1931 | if (!dir) | |
1932 | goto out_put_leader; | |
1933 | ||
1934 | name.name = buf; | |
1935 | name.len = snprintf(buf, sizeof(buf), "%d", task->pid); | |
1936 | dentry = d_hash_and_lookup(dir, &name); | |
1937 | if (dentry) { | |
1938 | shrink_dcache_parent(dentry); | |
1939 | d_drop(dentry); | |
1940 | dput(dentry); | |
1da177e4 | 1941 | } |
48e6484d EB |
1942 | |
1943 | dput(dir); | |
1944 | out_put_leader: | |
1945 | dput(leader); | |
1946 | out: | |
1947 | return; | |
1da177e4 LT |
1948 | } |
1949 | ||
1950 | /* SMP-safe */ | |
1951 | struct dentry *proc_pid_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd) | |
1952 | { | |
cd6a3ce9 | 1953 | struct dentry *result = ERR_PTR(-ENOENT); |
1da177e4 LT |
1954 | struct task_struct *task; |
1955 | struct inode *inode; | |
1956 | struct proc_inode *ei; | |
1957 | unsigned tgid; | |
1da177e4 LT |
1958 | |
1959 | if (dentry->d_name.len == 4 && !memcmp(dentry->d_name.name,"self",4)) { | |
1960 | inode = new_inode(dir->i_sb); | |
1961 | if (!inode) | |
1962 | return ERR_PTR(-ENOMEM); | |
1963 | ei = PROC_I(inode); | |
1964 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; | |
1965 | inode->i_ino = fake_ino(0, PROC_TGID_INO); | |
1966 | ei->pde = NULL; | |
1967 | inode->i_mode = S_IFLNK|S_IRWXUGO; | |
1968 | inode->i_uid = inode->i_gid = 0; | |
1969 | inode->i_size = 64; | |
1970 | inode->i_op = &proc_self_inode_operations; | |
1971 | d_add(dentry, inode); | |
1972 | return NULL; | |
1973 | } | |
1974 | tgid = name_to_int(dentry); | |
1975 | if (tgid == ~0U) | |
1976 | goto out; | |
1977 | ||
de758734 | 1978 | rcu_read_lock(); |
1da177e4 LT |
1979 | task = find_task_by_pid(tgid); |
1980 | if (task) | |
1981 | get_task_struct(task); | |
de758734 | 1982 | rcu_read_unlock(); |
1da177e4 LT |
1983 | if (!task) |
1984 | goto out; | |
1985 | ||
1986 | inode = proc_pid_make_inode(dir->i_sb, task, PROC_TGID_INO); | |
cd6a3ce9 EB |
1987 | if (!inode) |
1988 | goto out_put_task; | |
1da177e4 | 1989 | |
1da177e4 LT |
1990 | inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO; |
1991 | inode->i_op = &proc_tgid_base_inode_operations; | |
1992 | inode->i_fop = &proc_tgid_base_operations; | |
1da177e4 | 1993 | inode->i_flags|=S_IMMUTABLE; |
bcf88e11 DD |
1994 | #ifdef CONFIG_SECURITY |
1995 | inode->i_nlink = 5; | |
1996 | #else | |
1997 | inode->i_nlink = 4; | |
1998 | #endif | |
1da177e4 | 1999 | |
48e6484d | 2000 | dentry->d_op = &pid_dentry_operations; |
1da177e4 | 2001 | |
1da177e4 | 2002 | d_add(dentry, inode); |
cd6a3ce9 EB |
2003 | /* Close the race of the process dying before we return the dentry */ |
2004 | if (pid_revalidate(dentry, NULL)) | |
2005 | result = NULL; | |
1da177e4 | 2006 | |
cd6a3ce9 | 2007 | out_put_task: |
1da177e4 | 2008 | put_task_struct(task); |
1da177e4 | 2009 | out: |
cd6a3ce9 | 2010 | return result; |
1da177e4 LT |
2011 | } |
2012 | ||
1da177e4 | 2013 | /* |
0804ef4b | 2014 | * Find the first task with tgid >= tgid |
0bc58a91 | 2015 | * |
1da177e4 | 2016 | */ |
0804ef4b | 2017 | static struct task_struct *next_tgid(unsigned int tgid) |
1da177e4 | 2018 | { |
0804ef4b EB |
2019 | struct task_struct *task; |
2020 | struct pid *pid; | |
1da177e4 | 2021 | |
454cc105 | 2022 | rcu_read_lock(); |
0804ef4b EB |
2023 | retry: |
2024 | task = NULL; | |
2025 | pid = find_ge_pid(tgid); | |
2026 | if (pid) { | |
2027 | tgid = pid->nr + 1; | |
2028 | task = pid_task(pid, PIDTYPE_PID); | |
2029 | /* What we to know is if the pid we have find is the | |
2030 | * pid of a thread_group_leader. Testing for task | |
2031 | * being a thread_group_leader is the obvious thing | |
2032 | * todo but there is a window when it fails, due to | |
2033 | * the pid transfer logic in de_thread. | |
2034 | * | |
2035 | * So we perform the straight forward test of seeing | |
2036 | * if the pid we have found is the pid of a thread | |
2037 | * group leader, and don't worry if the task we have | |
2038 | * found doesn't happen to be a thread group leader. | |
2039 | * As we don't care in the case of readdir. | |
2040 | */ | |
2041 | if (!task || !has_group_leader_pid(task)) | |
2042 | goto retry; | |
2043 | get_task_struct(task); | |
0bc58a91 | 2044 | } |
454cc105 | 2045 | rcu_read_unlock(); |
0804ef4b | 2046 | return task; |
1da177e4 LT |
2047 | } |
2048 | ||
0804ef4b EB |
2049 | #define TGID_OFFSET (FIRST_PROCESS_ENTRY + (1 /* /proc/self */)) |
2050 | ||
1da177e4 LT |
2051 | /* for the /proc/ directory itself, after non-process stuff has been done */ |
2052 | int proc_pid_readdir(struct file * filp, void * dirent, filldir_t filldir) | |
2053 | { | |
1da177e4 LT |
2054 | char buf[PROC_NUMBUF]; |
2055 | unsigned int nr = filp->f_pos - FIRST_PROCESS_ENTRY; | |
0bc58a91 EB |
2056 | struct task_struct *task; |
2057 | int tgid; | |
1da177e4 LT |
2058 | |
2059 | if (!nr) { | |
2060 | ino_t ino = fake_ino(0,PROC_TGID_INO); | |
2061 | if (filldir(dirent, "self", 4, filp->f_pos, ino, DT_LNK) < 0) | |
2062 | return 0; | |
2063 | filp->f_pos++; | |
2064 | nr++; | |
2065 | } | |
2066 | ||
0804ef4b EB |
2067 | tgid = filp->f_pos - TGID_OFFSET; |
2068 | for (task = next_tgid(tgid); | |
0bc58a91 | 2069 | task; |
0804ef4b | 2070 | put_task_struct(task), task = next_tgid(tgid + 1)) { |
0bc58a91 EB |
2071 | int len; |
2072 | ino_t ino; | |
2073 | tgid = task->pid; | |
0804ef4b | 2074 | filp->f_pos = tgid + TGID_OFFSET; |
0bc58a91 EB |
2075 | len = snprintf(buf, sizeof(buf), "%d", tgid); |
2076 | ino = fake_ino(tgid, PROC_TGID_INO); | |
2077 | if (filldir(dirent, buf, len, filp->f_pos, ino, DT_DIR) < 0) { | |
0bc58a91 | 2078 | put_task_struct(task); |
0804ef4b | 2079 | goto out; |
1da177e4 | 2080 | } |
0bc58a91 | 2081 | } |
0804ef4b EB |
2082 | filp->f_pos = PID_MAX_LIMIT + TGID_OFFSET; |
2083 | out: | |
0bc58a91 EB |
2084 | return 0; |
2085 | } | |
1da177e4 | 2086 | |
28a6d671 EB |
2087 | /* |
2088 | * Tasks | |
2089 | */ | |
2090 | static struct pid_entry tid_base_stuff[] = { | |
2091 | E(PROC_TID_FD, "fd", S_IFDIR|S_IRUSR|S_IXUSR), | |
2092 | E(PROC_TID_ENVIRON, "environ", S_IFREG|S_IRUSR), | |
2093 | E(PROC_TID_AUXV, "auxv", S_IFREG|S_IRUSR), | |
2094 | E(PROC_TID_STATUS, "status", S_IFREG|S_IRUGO), | |
2095 | E(PROC_TID_CMDLINE, "cmdline", S_IFREG|S_IRUGO), | |
2096 | E(PROC_TID_STAT, "stat", S_IFREG|S_IRUGO), | |
2097 | E(PROC_TID_STATM, "statm", S_IFREG|S_IRUGO), | |
2098 | E(PROC_TID_MAPS, "maps", S_IFREG|S_IRUGO), | |
2099 | #ifdef CONFIG_NUMA | |
2100 | E(PROC_TID_NUMA_MAPS, "numa_maps", S_IFREG|S_IRUGO), | |
2101 | #endif | |
2102 | E(PROC_TID_MEM, "mem", S_IFREG|S_IRUSR|S_IWUSR), | |
2103 | #ifdef CONFIG_SECCOMP | |
2104 | E(PROC_TID_SECCOMP, "seccomp", S_IFREG|S_IRUSR|S_IWUSR), | |
2105 | #endif | |
2106 | E(PROC_TID_CWD, "cwd", S_IFLNK|S_IRWXUGO), | |
2107 | E(PROC_TID_ROOT, "root", S_IFLNK|S_IRWXUGO), | |
2108 | E(PROC_TID_EXE, "exe", S_IFLNK|S_IRWXUGO), | |
2109 | E(PROC_TID_MOUNTS, "mounts", S_IFREG|S_IRUGO), | |
2110 | #ifdef CONFIG_MMU | |
2111 | E(PROC_TID_SMAPS, "smaps", S_IFREG|S_IRUGO), | |
2112 | #endif | |
2113 | #ifdef CONFIG_SECURITY | |
2114 | E(PROC_TID_ATTR, "attr", S_IFDIR|S_IRUGO|S_IXUGO), | |
2115 | #endif | |
2116 | #ifdef CONFIG_KALLSYMS | |
2117 | E(PROC_TID_WCHAN, "wchan", S_IFREG|S_IRUGO), | |
2118 | #endif | |
2119 | #ifdef CONFIG_SCHEDSTATS | |
2120 | E(PROC_TID_SCHEDSTAT, "schedstat",S_IFREG|S_IRUGO), | |
2121 | #endif | |
2122 | #ifdef CONFIG_CPUSETS | |
2123 | E(PROC_TID_CPUSET, "cpuset", S_IFREG|S_IRUGO), | |
2124 | #endif | |
2125 | E(PROC_TID_OOM_SCORE, "oom_score",S_IFREG|S_IRUGO), | |
2126 | E(PROC_TID_OOM_ADJUST, "oom_adj", S_IFREG|S_IRUGO|S_IWUSR), | |
2127 | #ifdef CONFIG_AUDITSYSCALL | |
2128 | E(PROC_TID_LOGINUID, "loginuid", S_IFREG|S_IWUSR|S_IRUGO), | |
2129 | #endif | |
2130 | {0,0,NULL,0} | |
2131 | }; | |
2132 | ||
2133 | static int proc_tid_base_readdir(struct file * filp, | |
2134 | void * dirent, filldir_t filldir) | |
2135 | { | |
2136 | return proc_pident_readdir(filp,dirent,filldir, | |
2137 | tid_base_stuff,ARRAY_SIZE(tid_base_stuff)); | |
2138 | } | |
2139 | ||
2140 | static struct dentry *proc_tid_base_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd){ | |
2141 | return proc_pident_lookup(dir, dentry, tid_base_stuff); | |
2142 | } | |
2143 | ||
2144 | static struct file_operations proc_tid_base_operations = { | |
2145 | .read = generic_read_dir, | |
2146 | .readdir = proc_tid_base_readdir, | |
2147 | }; | |
2148 | ||
2149 | static struct inode_operations proc_tid_base_inode_operations = { | |
2150 | .lookup = proc_tid_base_lookup, | |
2151 | .getattr = pid_getattr, | |
2152 | .setattr = proc_setattr, | |
2153 | }; | |
2154 | ||
2155 | /* SMP-safe */ | |
2156 | static struct dentry *proc_task_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd) | |
2157 | { | |
2158 | struct dentry *result = ERR_PTR(-ENOENT); | |
2159 | struct task_struct *task; | |
2160 | struct task_struct *leader = get_proc_task(dir); | |
2161 | struct inode *inode; | |
2162 | unsigned tid; | |
2163 | ||
2164 | if (!leader) | |
2165 | goto out_no_task; | |
2166 | ||
2167 | tid = name_to_int(dentry); | |
2168 | if (tid == ~0U) | |
2169 | goto out; | |
2170 | ||
2171 | rcu_read_lock(); | |
2172 | task = find_task_by_pid(tid); | |
2173 | if (task) | |
2174 | get_task_struct(task); | |
2175 | rcu_read_unlock(); | |
2176 | if (!task) | |
2177 | goto out; | |
2178 | if (leader->tgid != task->tgid) | |
2179 | goto out_drop_task; | |
2180 | ||
2181 | inode = proc_pid_make_inode(dir->i_sb, task, PROC_TID_INO); | |
2182 | ||
2183 | ||
2184 | if (!inode) | |
2185 | goto out_drop_task; | |
2186 | inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO; | |
2187 | inode->i_op = &proc_tid_base_inode_operations; | |
2188 | inode->i_fop = &proc_tid_base_operations; | |
2189 | inode->i_flags|=S_IMMUTABLE; | |
2190 | #ifdef CONFIG_SECURITY | |
2191 | inode->i_nlink = 4; | |
2192 | #else | |
2193 | inode->i_nlink = 3; | |
2194 | #endif | |
2195 | ||
2196 | dentry->d_op = &pid_dentry_operations; | |
2197 | ||
2198 | d_add(dentry, inode); | |
2199 | /* Close the race of the process dying before we return the dentry */ | |
2200 | if (pid_revalidate(dentry, NULL)) | |
2201 | result = NULL; | |
2202 | ||
2203 | out_drop_task: | |
2204 | put_task_struct(task); | |
2205 | out: | |
2206 | put_task_struct(leader); | |
2207 | out_no_task: | |
2208 | return result; | |
2209 | } | |
2210 | ||
0bc58a91 EB |
2211 | /* |
2212 | * Find the first tid of a thread group to return to user space. | |
2213 | * | |
2214 | * Usually this is just the thread group leader, but if the users | |
2215 | * buffer was too small or there was a seek into the middle of the | |
2216 | * directory we have more work todo. | |
2217 | * | |
2218 | * In the case of a short read we start with find_task_by_pid. | |
2219 | * | |
2220 | * In the case of a seek we start with the leader and walk nr | |
2221 | * threads past it. | |
2222 | */ | |
cc288738 EB |
2223 | static struct task_struct *first_tid(struct task_struct *leader, |
2224 | int tid, int nr) | |
0bc58a91 | 2225 | { |
a872ff0c | 2226 | struct task_struct *pos; |
1da177e4 | 2227 | |
cc288738 | 2228 | rcu_read_lock(); |
0bc58a91 EB |
2229 | /* Attempt to start with the pid of a thread */ |
2230 | if (tid && (nr > 0)) { | |
2231 | pos = find_task_by_pid(tid); | |
a872ff0c ON |
2232 | if (pos && (pos->group_leader == leader)) |
2233 | goto found; | |
0bc58a91 | 2234 | } |
1da177e4 | 2235 | |
0bc58a91 | 2236 | /* If nr exceeds the number of threads there is nothing todo */ |
a872ff0c ON |
2237 | pos = NULL; |
2238 | if (nr && nr >= get_nr_threads(leader)) | |
2239 | goto out; | |
1da177e4 | 2240 | |
a872ff0c ON |
2241 | /* If we haven't found our starting place yet start |
2242 | * with the leader and walk nr threads forward. | |
0bc58a91 | 2243 | */ |
a872ff0c ON |
2244 | for (pos = leader; nr > 0; --nr) { |
2245 | pos = next_thread(pos); | |
2246 | if (pos == leader) { | |
2247 | pos = NULL; | |
2248 | goto out; | |
2249 | } | |
1da177e4 | 2250 | } |
a872ff0c ON |
2251 | found: |
2252 | get_task_struct(pos); | |
2253 | out: | |
cc288738 | 2254 | rcu_read_unlock(); |
0bc58a91 EB |
2255 | return pos; |
2256 | } | |
2257 | ||
2258 | /* | |
2259 | * Find the next thread in the thread list. | |
2260 | * Return NULL if there is an error or no next thread. | |
2261 | * | |
2262 | * The reference to the input task_struct is released. | |
2263 | */ | |
2264 | static struct task_struct *next_tid(struct task_struct *start) | |
2265 | { | |
c1df7fb8 | 2266 | struct task_struct *pos = NULL; |
cc288738 | 2267 | rcu_read_lock(); |
c1df7fb8 | 2268 | if (pid_alive(start)) { |
0bc58a91 | 2269 | pos = next_thread(start); |
c1df7fb8 ON |
2270 | if (thread_group_leader(pos)) |
2271 | pos = NULL; | |
2272 | else | |
2273 | get_task_struct(pos); | |
2274 | } | |
cc288738 | 2275 | rcu_read_unlock(); |
0bc58a91 EB |
2276 | put_task_struct(start); |
2277 | return pos; | |
1da177e4 LT |
2278 | } |
2279 | ||
2280 | /* for the /proc/TGID/task/ directories */ | |
2281 | static int proc_task_readdir(struct file * filp, void * dirent, filldir_t filldir) | |
2282 | { | |
1da177e4 | 2283 | char buf[PROC_NUMBUF]; |
1da177e4 LT |
2284 | struct dentry *dentry = filp->f_dentry; |
2285 | struct inode *inode = dentry->d_inode; | |
99f89551 | 2286 | struct task_struct *leader = get_proc_task(inode); |
0bc58a91 | 2287 | struct task_struct *task; |
1da177e4 LT |
2288 | int retval = -ENOENT; |
2289 | ino_t ino; | |
0bc58a91 | 2290 | int tid; |
1da177e4 LT |
2291 | unsigned long pos = filp->f_pos; /* avoiding "long long" filp->f_pos */ |
2292 | ||
99f89551 EB |
2293 | if (!leader) |
2294 | goto out_no_task; | |
1da177e4 LT |
2295 | retval = 0; |
2296 | ||
2297 | switch (pos) { | |
2298 | case 0: | |
2299 | ino = inode->i_ino; | |
2300 | if (filldir(dirent, ".", 1, pos, ino, DT_DIR) < 0) | |
2301 | goto out; | |
2302 | pos++; | |
2303 | /* fall through */ | |
2304 | case 1: | |
2305 | ino = parent_ino(dentry); | |
2306 | if (filldir(dirent, "..", 2, pos, ino, DT_DIR) < 0) | |
2307 | goto out; | |
2308 | pos++; | |
2309 | /* fall through */ | |
2310 | } | |
2311 | ||
0bc58a91 EB |
2312 | /* f_version caches the tgid value that the last readdir call couldn't |
2313 | * return. lseek aka telldir automagically resets f_version to 0. | |
2314 | */ | |
2315 | tid = filp->f_version; | |
2316 | filp->f_version = 0; | |
2317 | for (task = first_tid(leader, tid, pos - 2); | |
2318 | task; | |
2319 | task = next_tid(task), pos++) { | |
2320 | int len; | |
2321 | tid = task->pid; | |
2322 | len = snprintf(buf, sizeof(buf), "%d", tid); | |
2323 | ino = fake_ino(tid, PROC_TID_INO); | |
2324 | if (filldir(dirent, buf, len, pos, ino, DT_DIR < 0)) { | |
2325 | /* returning this tgid failed, save it as the first | |
2326 | * pid for the next readir call */ | |
2327 | filp->f_version = tid; | |
2328 | put_task_struct(task); | |
1da177e4 | 2329 | break; |
0bc58a91 | 2330 | } |
1da177e4 LT |
2331 | } |
2332 | out: | |
2333 | filp->f_pos = pos; | |
99f89551 EB |
2334 | put_task_struct(leader); |
2335 | out_no_task: | |
1da177e4 LT |
2336 | return retval; |
2337 | } | |
6e66b52b EB |
2338 | |
2339 | static int proc_task_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) | |
2340 | { | |
2341 | struct inode *inode = dentry->d_inode; | |
99f89551 | 2342 | struct task_struct *p = get_proc_task(inode); |
6e66b52b EB |
2343 | generic_fillattr(inode, stat); |
2344 | ||
99f89551 EB |
2345 | if (p) { |
2346 | rcu_read_lock(); | |
2347 | stat->nlink += get_nr_threads(p); | |
2348 | rcu_read_unlock(); | |
2349 | put_task_struct(p); | |
6e66b52b EB |
2350 | } |
2351 | ||
2352 | return 0; | |
2353 | } | |
28a6d671 EB |
2354 | |
2355 | static struct inode_operations proc_task_inode_operations = { | |
2356 | .lookup = proc_task_lookup, | |
2357 | .getattr = proc_task_getattr, | |
2358 | .setattr = proc_setattr, | |
2359 | }; | |
2360 | ||
2361 | static struct file_operations proc_task_operations = { | |
2362 | .read = generic_read_dir, | |
2363 | .readdir = proc_task_readdir, | |
2364 | }; |