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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; | |
20cdc894 EB |
197 | struct inode_operations *iop; |
198 | struct file_operations *fop; | |
199 | union proc_op op; | |
1da177e4 LT |
200 | }; |
201 | ||
20cdc894 EB |
202 | #define NOD(TYPE, NAME, MODE, IOP, FOP, OP) { \ |
203 | .type = (TYPE), \ | |
204 | .len = sizeof(NAME) - 1, \ | |
205 | .name = (NAME), \ | |
206 | .mode = MODE, \ | |
207 | .iop = IOP, \ | |
208 | .fop = FOP, \ | |
209 | .op = OP, \ | |
210 | } | |
211 | ||
212 | #define DIR(TYPE, NAME, MODE, OTYPE) \ | |
213 | NOD(TYPE, NAME, (S_IFDIR|(MODE)), \ | |
214 | &proc_##OTYPE##_inode_operations, &proc_##OTYPE##_operations, \ | |
215 | {} ) | |
216 | #define LNK(TYPE, NAME, OTYPE) \ | |
217 | NOD(TYPE, NAME, (S_IFLNK|S_IRWXUGO), \ | |
218 | &proc_pid_link_inode_operations, NULL, \ | |
219 | { .proc_get_link = &proc_##OTYPE##_link } ) | |
220 | #define REG(TYPE, NAME, MODE, OTYPE) \ | |
221 | NOD(TYPE, NAME, (S_IFREG|(MODE)), NULL, \ | |
222 | &proc_##OTYPE##_operations, {}) | |
223 | #define INF(TYPE, NAME, MODE, OTYPE) \ | |
224 | NOD(TYPE, NAME, (S_IFREG|(MODE)), \ | |
225 | NULL, &proc_info_file_operations, \ | |
226 | { .proc_read = &proc_##OTYPE } ) | |
1da177e4 | 227 | |
0494f6ec | 228 | static struct fs_struct *get_fs_struct(struct task_struct *task) |
1da177e4 LT |
229 | { |
230 | struct fs_struct *fs; | |
0494f6ec MS |
231 | task_lock(task); |
232 | fs = task->fs; | |
1da177e4 LT |
233 | if(fs) |
234 | atomic_inc(&fs->count); | |
0494f6ec MS |
235 | task_unlock(task); |
236 | return fs; | |
237 | } | |
238 | ||
99f89551 EB |
239 | static int get_nr_threads(struct task_struct *tsk) |
240 | { | |
241 | /* Must be called with the rcu_read_lock held */ | |
242 | unsigned long flags; | |
243 | int count = 0; | |
244 | ||
245 | if (lock_task_sighand(tsk, &flags)) { | |
246 | count = atomic_read(&tsk->signal->count); | |
247 | unlock_task_sighand(tsk, &flags); | |
248 | } | |
249 | return count; | |
250 | } | |
251 | ||
0494f6ec MS |
252 | static int proc_cwd_link(struct inode *inode, struct dentry **dentry, struct vfsmount **mnt) |
253 | { | |
99f89551 EB |
254 | struct task_struct *task = get_proc_task(inode); |
255 | struct fs_struct *fs = NULL; | |
0494f6ec | 256 | int result = -ENOENT; |
99f89551 EB |
257 | |
258 | if (task) { | |
259 | fs = get_fs_struct(task); | |
260 | put_task_struct(task); | |
261 | } | |
1da177e4 LT |
262 | if (fs) { |
263 | read_lock(&fs->lock); | |
264 | *mnt = mntget(fs->pwdmnt); | |
265 | *dentry = dget(fs->pwd); | |
266 | read_unlock(&fs->lock); | |
267 | result = 0; | |
268 | put_fs_struct(fs); | |
269 | } | |
270 | return result; | |
271 | } | |
272 | ||
273 | static int proc_root_link(struct inode *inode, struct dentry **dentry, struct vfsmount **mnt) | |
274 | { | |
99f89551 EB |
275 | struct task_struct *task = get_proc_task(inode); |
276 | struct fs_struct *fs = NULL; | |
1da177e4 | 277 | int result = -ENOENT; |
99f89551 EB |
278 | |
279 | if (task) { | |
280 | fs = get_fs_struct(task); | |
281 | put_task_struct(task); | |
282 | } | |
1da177e4 LT |
283 | if (fs) { |
284 | read_lock(&fs->lock); | |
285 | *mnt = mntget(fs->rootmnt); | |
286 | *dentry = dget(fs->root); | |
287 | read_unlock(&fs->lock); | |
288 | result = 0; | |
289 | put_fs_struct(fs); | |
290 | } | |
291 | return result; | |
292 | } | |
293 | ||
294 | #define MAY_PTRACE(task) \ | |
295 | (task == current || \ | |
296 | (task->parent == current && \ | |
297 | (task->ptrace & PT_PTRACED) && \ | |
298 | (task->state == TASK_STOPPED || task->state == TASK_TRACED) && \ | |
299 | security_ptrace(current,task) == 0)) | |
300 | ||
1da177e4 LT |
301 | static int proc_pid_environ(struct task_struct *task, char * buffer) |
302 | { | |
303 | int res = 0; | |
304 | struct mm_struct *mm = get_task_mm(task); | |
305 | if (mm) { | |
306 | unsigned int len = mm->env_end - mm->env_start; | |
307 | if (len > PAGE_SIZE) | |
308 | len = PAGE_SIZE; | |
309 | res = access_process_vm(task, mm->env_start, buffer, len, 0); | |
ab8d11be | 310 | if (!ptrace_may_attach(task)) |
1da177e4 LT |
311 | res = -ESRCH; |
312 | mmput(mm); | |
313 | } | |
314 | return res; | |
315 | } | |
316 | ||
317 | static int proc_pid_cmdline(struct task_struct *task, char * buffer) | |
318 | { | |
319 | int res = 0; | |
320 | unsigned int len; | |
321 | struct mm_struct *mm = get_task_mm(task); | |
322 | if (!mm) | |
323 | goto out; | |
324 | if (!mm->arg_end) | |
325 | goto out_mm; /* Shh! No looking before we're done */ | |
326 | ||
327 | len = mm->arg_end - mm->arg_start; | |
328 | ||
329 | if (len > PAGE_SIZE) | |
330 | len = PAGE_SIZE; | |
331 | ||
332 | res = access_process_vm(task, mm->arg_start, buffer, len, 0); | |
333 | ||
334 | // If the nul at the end of args has been overwritten, then | |
335 | // assume application is using setproctitle(3). | |
336 | if (res > 0 && buffer[res-1] != '\0' && len < PAGE_SIZE) { | |
337 | len = strnlen(buffer, res); | |
338 | if (len < res) { | |
339 | res = len; | |
340 | } else { | |
341 | len = mm->env_end - mm->env_start; | |
342 | if (len > PAGE_SIZE - res) | |
343 | len = PAGE_SIZE - res; | |
344 | res += access_process_vm(task, mm->env_start, buffer+res, len, 0); | |
345 | res = strnlen(buffer, res); | |
346 | } | |
347 | } | |
348 | out_mm: | |
349 | mmput(mm); | |
350 | out: | |
351 | return res; | |
352 | } | |
353 | ||
354 | static int proc_pid_auxv(struct task_struct *task, char *buffer) | |
355 | { | |
356 | int res = 0; | |
357 | struct mm_struct *mm = get_task_mm(task); | |
358 | if (mm) { | |
359 | unsigned int nwords = 0; | |
360 | do | |
361 | nwords += 2; | |
362 | while (mm->saved_auxv[nwords - 2] != 0); /* AT_NULL */ | |
363 | res = nwords * sizeof(mm->saved_auxv[0]); | |
364 | if (res > PAGE_SIZE) | |
365 | res = PAGE_SIZE; | |
366 | memcpy(buffer, mm->saved_auxv, res); | |
367 | mmput(mm); | |
368 | } | |
369 | return res; | |
370 | } | |
371 | ||
372 | ||
373 | #ifdef CONFIG_KALLSYMS | |
374 | /* | |
375 | * Provides a wchan file via kallsyms in a proper one-value-per-file format. | |
376 | * Returns the resolved symbol. If that fails, simply return the address. | |
377 | */ | |
378 | static int proc_pid_wchan(struct task_struct *task, char *buffer) | |
379 | { | |
380 | char *modname; | |
381 | const char *sym_name; | |
382 | unsigned long wchan, size, offset; | |
383 | char namebuf[KSYM_NAME_LEN+1]; | |
384 | ||
385 | wchan = get_wchan(task); | |
386 | ||
387 | sym_name = kallsyms_lookup(wchan, &size, &offset, &modname, namebuf); | |
388 | if (sym_name) | |
389 | return sprintf(buffer, "%s", sym_name); | |
390 | return sprintf(buffer, "%lu", wchan); | |
391 | } | |
392 | #endif /* CONFIG_KALLSYMS */ | |
393 | ||
394 | #ifdef CONFIG_SCHEDSTATS | |
395 | /* | |
396 | * Provides /proc/PID/schedstat | |
397 | */ | |
398 | static int proc_pid_schedstat(struct task_struct *task, char *buffer) | |
399 | { | |
400 | return sprintf(buffer, "%lu %lu %lu\n", | |
401 | task->sched_info.cpu_time, | |
402 | task->sched_info.run_delay, | |
403 | task->sched_info.pcnt); | |
404 | } | |
405 | #endif | |
406 | ||
407 | /* The badness from the OOM killer */ | |
408 | unsigned long badness(struct task_struct *p, unsigned long uptime); | |
409 | static int proc_oom_score(struct task_struct *task, char *buffer) | |
410 | { | |
411 | unsigned long points; | |
412 | struct timespec uptime; | |
413 | ||
414 | do_posix_clock_monotonic_gettime(&uptime); | |
415 | points = badness(task, uptime.tv_sec); | |
416 | return sprintf(buffer, "%lu\n", points); | |
417 | } | |
418 | ||
419 | /************************************************************************/ | |
420 | /* Here the fs part begins */ | |
421 | /************************************************************************/ | |
422 | ||
423 | /* permission checks */ | |
778c1144 | 424 | static int proc_fd_access_allowed(struct inode *inode) |
1da177e4 | 425 | { |
778c1144 EB |
426 | struct task_struct *task; |
427 | int allowed = 0; | |
df26c40e EB |
428 | /* Allow access to a task's file descriptors if it is us or we |
429 | * may use ptrace attach to the process and find out that | |
430 | * information. | |
778c1144 EB |
431 | */ |
432 | task = get_proc_task(inode); | |
df26c40e EB |
433 | if (task) { |
434 | allowed = ptrace_may_attach(task); | |
778c1144 | 435 | put_task_struct(task); |
df26c40e | 436 | } |
778c1144 | 437 | return allowed; |
1da177e4 LT |
438 | } |
439 | ||
6d76fa58 LT |
440 | static int proc_setattr(struct dentry *dentry, struct iattr *attr) |
441 | { | |
442 | int error; | |
443 | struct inode *inode = dentry->d_inode; | |
444 | ||
445 | if (attr->ia_valid & ATTR_MODE) | |
446 | return -EPERM; | |
447 | ||
448 | error = inode_change_ok(inode, attr); | |
449 | if (!error) { | |
450 | error = security_inode_setattr(dentry, attr); | |
451 | if (!error) | |
452 | error = inode_setattr(inode, attr); | |
453 | } | |
454 | return error; | |
455 | } | |
456 | ||
457 | static struct inode_operations proc_def_inode_operations = { | |
458 | .setattr = proc_setattr, | |
459 | }; | |
460 | ||
1da177e4 | 461 | extern struct seq_operations mounts_op; |
5addc5dd AV |
462 | struct proc_mounts { |
463 | struct seq_file m; | |
464 | int event; | |
465 | }; | |
466 | ||
1da177e4 LT |
467 | static int mounts_open(struct inode *inode, struct file *file) |
468 | { | |
99f89551 EB |
469 | struct task_struct *task = get_proc_task(inode); |
470 | struct namespace *namespace = NULL; | |
5addc5dd AV |
471 | struct proc_mounts *p; |
472 | int ret = -EINVAL; | |
1da177e4 | 473 | |
99f89551 EB |
474 | if (task) { |
475 | task_lock(task); | |
476 | namespace = task->namespace; | |
477 | if (namespace) | |
478 | get_namespace(namespace); | |
479 | task_unlock(task); | |
480 | put_task_struct(task); | |
481 | } | |
5addc5dd AV |
482 | |
483 | if (namespace) { | |
484 | ret = -ENOMEM; | |
485 | p = kmalloc(sizeof(struct proc_mounts), GFP_KERNEL); | |
486 | if (p) { | |
487 | file->private_data = &p->m; | |
488 | ret = seq_open(file, &mounts_op); | |
489 | if (!ret) { | |
490 | p->m.private = namespace; | |
491 | p->event = namespace->event; | |
492 | return 0; | |
493 | } | |
494 | kfree(p); | |
1da177e4 | 495 | } |
5addc5dd | 496 | put_namespace(namespace); |
1da177e4 LT |
497 | } |
498 | return ret; | |
499 | } | |
500 | ||
501 | static int mounts_release(struct inode *inode, struct file *file) | |
502 | { | |
503 | struct seq_file *m = file->private_data; | |
504 | struct namespace *namespace = m->private; | |
505 | put_namespace(namespace); | |
506 | return seq_release(inode, file); | |
507 | } | |
508 | ||
5addc5dd AV |
509 | static unsigned mounts_poll(struct file *file, poll_table *wait) |
510 | { | |
511 | struct proc_mounts *p = file->private_data; | |
512 | struct namespace *ns = p->m.private; | |
513 | unsigned res = 0; | |
514 | ||
515 | poll_wait(file, &ns->poll, wait); | |
516 | ||
517 | spin_lock(&vfsmount_lock); | |
518 | if (p->event != ns->event) { | |
519 | p->event = ns->event; | |
520 | res = POLLERR; | |
521 | } | |
522 | spin_unlock(&vfsmount_lock); | |
523 | ||
524 | return res; | |
525 | } | |
526 | ||
1da177e4 LT |
527 | static struct file_operations proc_mounts_operations = { |
528 | .open = mounts_open, | |
529 | .read = seq_read, | |
530 | .llseek = seq_lseek, | |
531 | .release = mounts_release, | |
5addc5dd | 532 | .poll = mounts_poll, |
1da177e4 LT |
533 | }; |
534 | ||
b4629fe2 CL |
535 | extern struct seq_operations mountstats_op; |
536 | static int mountstats_open(struct inode *inode, struct file *file) | |
537 | { | |
b4629fe2 CL |
538 | int ret = seq_open(file, &mountstats_op); |
539 | ||
540 | if (!ret) { | |
541 | struct seq_file *m = file->private_data; | |
99f89551 EB |
542 | struct namespace *namespace = NULL; |
543 | struct task_struct *task = get_proc_task(inode); | |
544 | ||
545 | if (task) { | |
546 | task_lock(task); | |
547 | namespace = task->namespace; | |
548 | if (namespace) | |
549 | get_namespace(namespace); | |
550 | task_unlock(task); | |
551 | put_task_struct(task); | |
552 | } | |
b4629fe2 CL |
553 | |
554 | if (namespace) | |
555 | m->private = namespace; | |
556 | else { | |
557 | seq_release(inode, file); | |
558 | ret = -EINVAL; | |
559 | } | |
560 | } | |
561 | return ret; | |
562 | } | |
563 | ||
564 | static struct file_operations proc_mountstats_operations = { | |
565 | .open = mountstats_open, | |
566 | .read = seq_read, | |
567 | .llseek = seq_lseek, | |
568 | .release = mounts_release, | |
569 | }; | |
570 | ||
1da177e4 LT |
571 | #define PROC_BLOCK_SIZE (3*1024) /* 4K page size but our output routines use some slack for overruns */ |
572 | ||
573 | static ssize_t proc_info_read(struct file * file, char __user * buf, | |
574 | size_t count, loff_t *ppos) | |
575 | { | |
576 | struct inode * inode = file->f_dentry->d_inode; | |
577 | unsigned long page; | |
578 | ssize_t length; | |
99f89551 EB |
579 | struct task_struct *task = get_proc_task(inode); |
580 | ||
581 | length = -ESRCH; | |
582 | if (!task) | |
583 | goto out_no_task; | |
1da177e4 LT |
584 | |
585 | if (count > PROC_BLOCK_SIZE) | |
586 | count = PROC_BLOCK_SIZE; | |
99f89551 EB |
587 | |
588 | length = -ENOMEM; | |
1da177e4 | 589 | if (!(page = __get_free_page(GFP_KERNEL))) |
99f89551 | 590 | goto out; |
1da177e4 LT |
591 | |
592 | length = PROC_I(inode)->op.proc_read(task, (char*)page); | |
593 | ||
594 | if (length >= 0) | |
595 | length = simple_read_from_buffer(buf, count, ppos, (char *)page, length); | |
596 | free_page(page); | |
99f89551 EB |
597 | out: |
598 | put_task_struct(task); | |
599 | out_no_task: | |
1da177e4 LT |
600 | return length; |
601 | } | |
602 | ||
603 | static struct file_operations proc_info_file_operations = { | |
604 | .read = proc_info_read, | |
605 | }; | |
606 | ||
607 | static int mem_open(struct inode* inode, struct file* file) | |
608 | { | |
609 | file->private_data = (void*)((long)current->self_exec_id); | |
610 | return 0; | |
611 | } | |
612 | ||
613 | static ssize_t mem_read(struct file * file, char __user * buf, | |
614 | size_t count, loff_t *ppos) | |
615 | { | |
99f89551 | 616 | struct task_struct *task = get_proc_task(file->f_dentry->d_inode); |
1da177e4 LT |
617 | char *page; |
618 | unsigned long src = *ppos; | |
619 | int ret = -ESRCH; | |
620 | struct mm_struct *mm; | |
621 | ||
99f89551 EB |
622 | if (!task) |
623 | goto out_no_task; | |
624 | ||
ab8d11be | 625 | if (!MAY_PTRACE(task) || !ptrace_may_attach(task)) |
1da177e4 LT |
626 | goto out; |
627 | ||
628 | ret = -ENOMEM; | |
629 | page = (char *)__get_free_page(GFP_USER); | |
630 | if (!page) | |
631 | goto out; | |
632 | ||
633 | ret = 0; | |
634 | ||
635 | mm = get_task_mm(task); | |
636 | if (!mm) | |
637 | goto out_free; | |
638 | ||
639 | ret = -EIO; | |
640 | ||
641 | if (file->private_data != (void*)((long)current->self_exec_id)) | |
642 | goto out_put; | |
643 | ||
644 | ret = 0; | |
645 | ||
646 | while (count > 0) { | |
647 | int this_len, retval; | |
648 | ||
649 | this_len = (count > PAGE_SIZE) ? PAGE_SIZE : count; | |
650 | retval = access_process_vm(task, src, page, this_len, 0); | |
ab8d11be | 651 | if (!retval || !MAY_PTRACE(task) || !ptrace_may_attach(task)) { |
1da177e4 LT |
652 | if (!ret) |
653 | ret = -EIO; | |
654 | break; | |
655 | } | |
656 | ||
657 | if (copy_to_user(buf, page, retval)) { | |
658 | ret = -EFAULT; | |
659 | break; | |
660 | } | |
661 | ||
662 | ret += retval; | |
663 | src += retval; | |
664 | buf += retval; | |
665 | count -= retval; | |
666 | } | |
667 | *ppos = src; | |
668 | ||
669 | out_put: | |
670 | mmput(mm); | |
671 | out_free: | |
672 | free_page((unsigned long) page); | |
673 | out: | |
99f89551 EB |
674 | put_task_struct(task); |
675 | out_no_task: | |
1da177e4 LT |
676 | return ret; |
677 | } | |
678 | ||
679 | #define mem_write NULL | |
680 | ||
681 | #ifndef mem_write | |
682 | /* This is a security hazard */ | |
683 | static ssize_t mem_write(struct file * file, const char * buf, | |
684 | size_t count, loff_t *ppos) | |
685 | { | |
f7ca54f4 | 686 | int copied; |
1da177e4 | 687 | char *page; |
99f89551 | 688 | struct task_struct *task = get_proc_task(file->f_dentry->d_inode); |
1da177e4 LT |
689 | unsigned long dst = *ppos; |
690 | ||
99f89551 EB |
691 | copied = -ESRCH; |
692 | if (!task) | |
693 | goto out_no_task; | |
694 | ||
ab8d11be | 695 | if (!MAY_PTRACE(task) || !ptrace_may_attach(task)) |
99f89551 | 696 | goto out; |
1da177e4 | 697 | |
99f89551 | 698 | copied = -ENOMEM; |
1da177e4 LT |
699 | page = (char *)__get_free_page(GFP_USER); |
700 | if (!page) | |
99f89551 | 701 | goto out; |
1da177e4 | 702 | |
f7ca54f4 | 703 | copied = 0; |
1da177e4 LT |
704 | while (count > 0) { |
705 | int this_len, retval; | |
706 | ||
707 | this_len = (count > PAGE_SIZE) ? PAGE_SIZE : count; | |
708 | if (copy_from_user(page, buf, this_len)) { | |
709 | copied = -EFAULT; | |
710 | break; | |
711 | } | |
712 | retval = access_process_vm(task, dst, page, this_len, 1); | |
713 | if (!retval) { | |
714 | if (!copied) | |
715 | copied = -EIO; | |
716 | break; | |
717 | } | |
718 | copied += retval; | |
719 | buf += retval; | |
720 | dst += retval; | |
721 | count -= retval; | |
722 | } | |
723 | *ppos = dst; | |
724 | free_page((unsigned long) page); | |
99f89551 EB |
725 | out: |
726 | put_task_struct(task); | |
727 | out_no_task: | |
1da177e4 LT |
728 | return copied; |
729 | } | |
730 | #endif | |
731 | ||
732 | static loff_t mem_lseek(struct file * file, loff_t offset, int orig) | |
733 | { | |
734 | switch (orig) { | |
735 | case 0: | |
736 | file->f_pos = offset; | |
737 | break; | |
738 | case 1: | |
739 | file->f_pos += offset; | |
740 | break; | |
741 | default: | |
742 | return -EINVAL; | |
743 | } | |
744 | force_successful_syscall_return(); | |
745 | return file->f_pos; | |
746 | } | |
747 | ||
748 | static struct file_operations proc_mem_operations = { | |
749 | .llseek = mem_lseek, | |
750 | .read = mem_read, | |
751 | .write = mem_write, | |
752 | .open = mem_open, | |
753 | }; | |
754 | ||
755 | static ssize_t oom_adjust_read(struct file *file, char __user *buf, | |
756 | size_t count, loff_t *ppos) | |
757 | { | |
99f89551 | 758 | struct task_struct *task = get_proc_task(file->f_dentry->d_inode); |
8578cea7 | 759 | char buffer[PROC_NUMBUF]; |
1da177e4 | 760 | size_t len; |
99f89551 | 761 | int oom_adjust; |
1da177e4 LT |
762 | loff_t __ppos = *ppos; |
763 | ||
99f89551 EB |
764 | if (!task) |
765 | return -ESRCH; | |
766 | oom_adjust = task->oomkilladj; | |
767 | put_task_struct(task); | |
768 | ||
8578cea7 | 769 | len = snprintf(buffer, sizeof(buffer), "%i\n", oom_adjust); |
1da177e4 LT |
770 | if (__ppos >= len) |
771 | return 0; | |
772 | if (count > len-__ppos) | |
773 | count = len-__ppos; | |
774 | if (copy_to_user(buf, buffer + __ppos, count)) | |
775 | return -EFAULT; | |
776 | *ppos = __ppos + count; | |
777 | return count; | |
778 | } | |
779 | ||
780 | static ssize_t oom_adjust_write(struct file *file, const char __user *buf, | |
781 | size_t count, loff_t *ppos) | |
782 | { | |
99f89551 | 783 | struct task_struct *task; |
8578cea7 | 784 | char buffer[PROC_NUMBUF], *end; |
1da177e4 LT |
785 | int oom_adjust; |
786 | ||
787 | if (!capable(CAP_SYS_RESOURCE)) | |
788 | return -EPERM; | |
8578cea7 EB |
789 | memset(buffer, 0, sizeof(buffer)); |
790 | if (count > sizeof(buffer) - 1) | |
791 | count = sizeof(buffer) - 1; | |
1da177e4 LT |
792 | if (copy_from_user(buffer, buf, count)) |
793 | return -EFAULT; | |
794 | oom_adjust = simple_strtol(buffer, &end, 0); | |
79befd0c | 795 | if ((oom_adjust < -16 || oom_adjust > 15) && oom_adjust != OOM_DISABLE) |
1da177e4 LT |
796 | return -EINVAL; |
797 | if (*end == '\n') | |
798 | end++; | |
99f89551 EB |
799 | task = get_proc_task(file->f_dentry->d_inode); |
800 | if (!task) | |
801 | return -ESRCH; | |
1da177e4 | 802 | task->oomkilladj = oom_adjust; |
99f89551 | 803 | put_task_struct(task); |
1da177e4 LT |
804 | if (end - buffer == 0) |
805 | return -EIO; | |
806 | return end - buffer; | |
807 | } | |
808 | ||
809 | static struct file_operations proc_oom_adjust_operations = { | |
810 | .read = oom_adjust_read, | |
811 | .write = oom_adjust_write, | |
812 | }; | |
813 | ||
1da177e4 LT |
814 | #ifdef CONFIG_AUDITSYSCALL |
815 | #define TMPBUFLEN 21 | |
816 | static ssize_t proc_loginuid_read(struct file * file, char __user * buf, | |
817 | size_t count, loff_t *ppos) | |
818 | { | |
819 | struct inode * inode = file->f_dentry->d_inode; | |
99f89551 | 820 | struct task_struct *task = get_proc_task(inode); |
1da177e4 LT |
821 | ssize_t length; |
822 | char tmpbuf[TMPBUFLEN]; | |
823 | ||
99f89551 EB |
824 | if (!task) |
825 | return -ESRCH; | |
1da177e4 LT |
826 | length = scnprintf(tmpbuf, TMPBUFLEN, "%u", |
827 | audit_get_loginuid(task->audit_context)); | |
99f89551 | 828 | put_task_struct(task); |
1da177e4 LT |
829 | return simple_read_from_buffer(buf, count, ppos, tmpbuf, length); |
830 | } | |
831 | ||
832 | static ssize_t proc_loginuid_write(struct file * file, const char __user * buf, | |
833 | size_t count, loff_t *ppos) | |
834 | { | |
835 | struct inode * inode = file->f_dentry->d_inode; | |
836 | char *page, *tmp; | |
837 | ssize_t length; | |
1da177e4 LT |
838 | uid_t loginuid; |
839 | ||
840 | if (!capable(CAP_AUDIT_CONTROL)) | |
841 | return -EPERM; | |
842 | ||
13b41b09 | 843 | if (current != pid_task(proc_pid(inode), PIDTYPE_PID)) |
1da177e4 LT |
844 | return -EPERM; |
845 | ||
e0182909 AV |
846 | if (count >= PAGE_SIZE) |
847 | count = PAGE_SIZE - 1; | |
1da177e4 LT |
848 | |
849 | if (*ppos != 0) { | |
850 | /* No partial writes. */ | |
851 | return -EINVAL; | |
852 | } | |
853 | page = (char*)__get_free_page(GFP_USER); | |
854 | if (!page) | |
855 | return -ENOMEM; | |
856 | length = -EFAULT; | |
857 | if (copy_from_user(page, buf, count)) | |
858 | goto out_free_page; | |
859 | ||
e0182909 | 860 | page[count] = '\0'; |
1da177e4 LT |
861 | loginuid = simple_strtoul(page, &tmp, 10); |
862 | if (tmp == page) { | |
863 | length = -EINVAL; | |
864 | goto out_free_page; | |
865 | ||
866 | } | |
99f89551 | 867 | length = audit_set_loginuid(current, loginuid); |
1da177e4 LT |
868 | if (likely(length == 0)) |
869 | length = count; | |
870 | ||
871 | out_free_page: | |
872 | free_page((unsigned long) page); | |
873 | return length; | |
874 | } | |
875 | ||
876 | static struct file_operations proc_loginuid_operations = { | |
877 | .read = proc_loginuid_read, | |
878 | .write = proc_loginuid_write, | |
879 | }; | |
880 | #endif | |
881 | ||
882 | #ifdef CONFIG_SECCOMP | |
883 | static ssize_t seccomp_read(struct file *file, char __user *buf, | |
884 | size_t count, loff_t *ppos) | |
885 | { | |
99f89551 | 886 | struct task_struct *tsk = get_proc_task(file->f_dentry->d_inode); |
1da177e4 LT |
887 | char __buf[20]; |
888 | loff_t __ppos = *ppos; | |
889 | size_t len; | |
890 | ||
99f89551 EB |
891 | if (!tsk) |
892 | return -ESRCH; | |
1da177e4 LT |
893 | /* no need to print the trailing zero, so use only len */ |
894 | len = sprintf(__buf, "%u\n", tsk->seccomp.mode); | |
99f89551 | 895 | put_task_struct(tsk); |
1da177e4 LT |
896 | if (__ppos >= len) |
897 | return 0; | |
898 | if (count > len - __ppos) | |
899 | count = len - __ppos; | |
900 | if (copy_to_user(buf, __buf + __ppos, count)) | |
901 | return -EFAULT; | |
902 | *ppos = __ppos + count; | |
903 | return count; | |
904 | } | |
905 | ||
906 | static ssize_t seccomp_write(struct file *file, const char __user *buf, | |
907 | size_t count, loff_t *ppos) | |
908 | { | |
99f89551 | 909 | struct task_struct *tsk = get_proc_task(file->f_dentry->d_inode); |
1da177e4 LT |
910 | char __buf[20], *end; |
911 | unsigned int seccomp_mode; | |
99f89551 EB |
912 | ssize_t result; |
913 | ||
914 | result = -ESRCH; | |
915 | if (!tsk) | |
916 | goto out_no_task; | |
1da177e4 LT |
917 | |
918 | /* can set it only once to be even more secure */ | |
99f89551 | 919 | result = -EPERM; |
1da177e4 | 920 | if (unlikely(tsk->seccomp.mode)) |
99f89551 | 921 | goto out; |
1da177e4 | 922 | |
99f89551 | 923 | result = -EFAULT; |
1da177e4 LT |
924 | memset(__buf, 0, sizeof(__buf)); |
925 | count = min(count, sizeof(__buf) - 1); | |
926 | if (copy_from_user(__buf, buf, count)) | |
99f89551 EB |
927 | goto out; |
928 | ||
1da177e4 LT |
929 | seccomp_mode = simple_strtoul(__buf, &end, 0); |
930 | if (*end == '\n') | |
931 | end++; | |
99f89551 | 932 | result = -EINVAL; |
1da177e4 LT |
933 | if (seccomp_mode && seccomp_mode <= NR_SECCOMP_MODES) { |
934 | tsk->seccomp.mode = seccomp_mode; | |
935 | set_tsk_thread_flag(tsk, TIF_SECCOMP); | |
936 | } else | |
99f89551 EB |
937 | goto out; |
938 | result = -EIO; | |
1da177e4 | 939 | if (unlikely(!(end - __buf))) |
99f89551 EB |
940 | goto out; |
941 | result = end - __buf; | |
942 | out: | |
943 | put_task_struct(tsk); | |
944 | out_no_task: | |
945 | return result; | |
1da177e4 LT |
946 | } |
947 | ||
948 | static struct file_operations proc_seccomp_operations = { | |
949 | .read = seccomp_read, | |
950 | .write = seccomp_write, | |
951 | }; | |
952 | #endif /* CONFIG_SECCOMP */ | |
953 | ||
008b150a | 954 | static void *proc_pid_follow_link(struct dentry *dentry, struct nameidata *nd) |
1da177e4 LT |
955 | { |
956 | struct inode *inode = dentry->d_inode; | |
957 | int error = -EACCES; | |
958 | ||
959 | /* We don't need a base pointer in the /proc filesystem */ | |
960 | path_release(nd); | |
961 | ||
778c1144 EB |
962 | /* Are we allowed to snoop on the tasks file descriptors? */ |
963 | if (!proc_fd_access_allowed(inode)) | |
1da177e4 | 964 | goto out; |
1da177e4 LT |
965 | |
966 | error = PROC_I(inode)->op.proc_get_link(inode, &nd->dentry, &nd->mnt); | |
967 | nd->last_type = LAST_BIND; | |
968 | out: | |
008b150a | 969 | return ERR_PTR(error); |
1da177e4 LT |
970 | } |
971 | ||
972 | static int do_proc_readlink(struct dentry *dentry, struct vfsmount *mnt, | |
973 | char __user *buffer, int buflen) | |
974 | { | |
975 | struct inode * inode; | |
976 | char *tmp = (char*)__get_free_page(GFP_KERNEL), *path; | |
977 | int len; | |
978 | ||
979 | if (!tmp) | |
980 | return -ENOMEM; | |
981 | ||
982 | inode = dentry->d_inode; | |
983 | path = d_path(dentry, mnt, tmp, PAGE_SIZE); | |
984 | len = PTR_ERR(path); | |
985 | if (IS_ERR(path)) | |
986 | goto out; | |
987 | len = tmp + PAGE_SIZE - 1 - path; | |
988 | ||
989 | if (len > buflen) | |
990 | len = buflen; | |
991 | if (copy_to_user(buffer, path, len)) | |
992 | len = -EFAULT; | |
993 | out: | |
994 | free_page((unsigned long)tmp); | |
995 | return len; | |
996 | } | |
997 | ||
998 | static int proc_pid_readlink(struct dentry * dentry, char __user * buffer, int buflen) | |
999 | { | |
1000 | int error = -EACCES; | |
1001 | struct inode *inode = dentry->d_inode; | |
1002 | struct dentry *de; | |
1003 | struct vfsmount *mnt = NULL; | |
1004 | ||
778c1144 EB |
1005 | /* Are we allowed to snoop on the tasks file descriptors? */ |
1006 | if (!proc_fd_access_allowed(inode)) | |
1da177e4 | 1007 | goto out; |
1da177e4 LT |
1008 | |
1009 | error = PROC_I(inode)->op.proc_get_link(inode, &de, &mnt); | |
1010 | if (error) | |
1011 | goto out; | |
1012 | ||
1013 | error = do_proc_readlink(de, mnt, buffer, buflen); | |
1014 | dput(de); | |
1015 | mntput(mnt); | |
1016 | out: | |
1da177e4 LT |
1017 | return error; |
1018 | } | |
1019 | ||
1020 | static struct inode_operations proc_pid_link_inode_operations = { | |
1021 | .readlink = proc_pid_readlink, | |
6d76fa58 LT |
1022 | .follow_link = proc_pid_follow_link, |
1023 | .setattr = proc_setattr, | |
1da177e4 LT |
1024 | }; |
1025 | ||
28a6d671 EB |
1026 | |
1027 | /* building an inode */ | |
1028 | ||
1029 | static int task_dumpable(struct task_struct *task) | |
1da177e4 | 1030 | { |
28a6d671 EB |
1031 | int dumpable = 0; |
1032 | struct mm_struct *mm; | |
1da177e4 | 1033 | |
28a6d671 EB |
1034 | task_lock(task); |
1035 | mm = task->mm; | |
1036 | if (mm) | |
1037 | dumpable = mm->dumpable; | |
1038 | task_unlock(task); | |
1039 | if(dumpable == 1) | |
1040 | return 1; | |
1041 | return 0; | |
1042 | } | |
1da177e4 | 1043 | |
1da177e4 | 1044 | |
28a6d671 EB |
1045 | static struct inode *proc_pid_make_inode(struct super_block * sb, struct task_struct *task, int ino) |
1046 | { | |
1047 | struct inode * inode; | |
1048 | struct proc_inode *ei; | |
1da177e4 | 1049 | |
28a6d671 | 1050 | /* We need a new inode */ |
1da177e4 | 1051 | |
28a6d671 EB |
1052 | inode = new_inode(sb); |
1053 | if (!inode) | |
1054 | goto out; | |
1055 | ||
1056 | /* Common stuff */ | |
1057 | ei = PROC_I(inode); | |
1058 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; | |
1059 | inode->i_ino = fake_ino(task->pid, ino); | |
1060 | inode->i_op = &proc_def_inode_operations; | |
1061 | ||
1062 | /* | |
1063 | * grab the reference to task. | |
1064 | */ | |
1065 | ei->pid = get_pid(task->pids[PIDTYPE_PID].pid); | |
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 | ||
1162 | static unsigned name_to_int(struct dentry *dentry) | |
1163 | { | |
1164 | const char *name = dentry->d_name.name; | |
1165 | int len = dentry->d_name.len; | |
1166 | unsigned n = 0; | |
1167 | ||
1168 | if (len > 1 && *name == '0') | |
1169 | goto out; | |
1170 | while (len-- > 0) { | |
1171 | unsigned c = *name++ - '0'; | |
1172 | if (c > 9) | |
1173 | goto out; | |
1174 | if (n >= (~0U-9)/10) | |
1175 | goto out; | |
1176 | n *= 10; | |
1177 | n += c; | |
1178 | } | |
1179 | return n; | |
1180 | out: | |
1181 | return ~0U; | |
1182 | } | |
1183 | ||
1184 | static int proc_fd_link(struct inode *inode, struct dentry **dentry, struct vfsmount **mnt) | |
1185 | { | |
1186 | struct task_struct *task = get_proc_task(inode); | |
1187 | struct files_struct *files = NULL; | |
1188 | struct file *file; | |
1189 | int fd = proc_fd(inode); | |
99f89551 | 1190 | |
99f89551 | 1191 | if (task) { |
28a6d671 EB |
1192 | files = get_files_struct(task); |
1193 | put_task_struct(task); | |
1194 | } | |
1195 | if (files) { | |
1196 | /* | |
1197 | * We are not taking a ref to the file structure, so we must | |
1198 | * hold ->file_lock. | |
1199 | */ | |
1200 | spin_lock(&files->file_lock); | |
1201 | file = fcheck_files(files, fd); | |
1202 | if (file) { | |
1203 | *mnt = mntget(file->f_vfsmnt); | |
1204 | *dentry = dget(file->f_dentry); | |
1205 | spin_unlock(&files->file_lock); | |
1206 | put_files_struct(files); | |
1207 | return 0; | |
99f89551 | 1208 | } |
28a6d671 EB |
1209 | spin_unlock(&files->file_lock); |
1210 | put_files_struct(files); | |
99f89551 | 1211 | } |
28a6d671 | 1212 | return -ENOENT; |
99f89551 EB |
1213 | } |
1214 | ||
1da177e4 LT |
1215 | static int tid_fd_revalidate(struct dentry *dentry, struct nameidata *nd) |
1216 | { | |
1217 | struct inode *inode = dentry->d_inode; | |
99f89551 | 1218 | struct task_struct *task = get_proc_task(inode); |
aed7a6c4 | 1219 | int fd = proc_fd(inode); |
1da177e4 LT |
1220 | struct files_struct *files; |
1221 | ||
99f89551 EB |
1222 | if (task) { |
1223 | files = get_files_struct(task); | |
1224 | if (files) { | |
1225 | rcu_read_lock(); | |
1226 | if (fcheck_files(files, fd)) { | |
1227 | rcu_read_unlock(); | |
1228 | put_files_struct(files); | |
1229 | if (task_dumpable(task)) { | |
1230 | inode->i_uid = task->euid; | |
1231 | inode->i_gid = task->egid; | |
1232 | } else { | |
1233 | inode->i_uid = 0; | |
1234 | inode->i_gid = 0; | |
1235 | } | |
9ee8ab9f | 1236 | inode->i_mode &= ~(S_ISUID | S_ISGID); |
99f89551 EB |
1237 | security_task_to_inode(task, inode); |
1238 | put_task_struct(task); | |
1239 | return 1; | |
1240 | } | |
b835996f | 1241 | rcu_read_unlock(); |
1da177e4 | 1242 | put_files_struct(files); |
1da177e4 | 1243 | } |
99f89551 | 1244 | put_task_struct(task); |
1da177e4 LT |
1245 | } |
1246 | d_drop(dentry); | |
1247 | return 0; | |
1248 | } | |
1249 | ||
1da177e4 LT |
1250 | static struct dentry_operations tid_fd_dentry_operations = |
1251 | { | |
1252 | .d_revalidate = tid_fd_revalidate, | |
1253 | .d_delete = pid_delete_dentry, | |
1254 | }; | |
1255 | ||
1da177e4 LT |
1256 | /* SMP-safe */ |
1257 | static struct dentry *proc_lookupfd(struct inode * dir, struct dentry * dentry, struct nameidata *nd) | |
1258 | { | |
99f89551 | 1259 | struct task_struct *task = get_proc_task(dir); |
1da177e4 | 1260 | unsigned fd = name_to_int(dentry); |
cd6a3ce9 | 1261 | struct dentry *result = ERR_PTR(-ENOENT); |
1da177e4 LT |
1262 | struct file * file; |
1263 | struct files_struct * files; | |
1264 | struct inode *inode; | |
1265 | struct proc_inode *ei; | |
1266 | ||
99f89551 EB |
1267 | if (!task) |
1268 | goto out_no_task; | |
1da177e4 LT |
1269 | if (fd == ~0U) |
1270 | goto out; | |
1da177e4 LT |
1271 | |
1272 | inode = proc_pid_make_inode(dir->i_sb, task, PROC_TID_FD_DIR+fd); | |
1273 | if (!inode) | |
1274 | goto out; | |
1275 | ei = PROC_I(inode); | |
aed7a6c4 | 1276 | ei->fd = fd; |
1da177e4 LT |
1277 | files = get_files_struct(task); |
1278 | if (!files) | |
1279 | goto out_unlock; | |
1280 | inode->i_mode = S_IFLNK; | |
ca99c1da DS |
1281 | |
1282 | /* | |
1283 | * We are not taking a ref to the file structure, so we must | |
1284 | * hold ->file_lock. | |
1285 | */ | |
1286 | spin_lock(&files->file_lock); | |
1da177e4 LT |
1287 | file = fcheck_files(files, fd); |
1288 | if (!file) | |
1289 | goto out_unlock2; | |
1290 | if (file->f_mode & 1) | |
1291 | inode->i_mode |= S_IRUSR | S_IXUSR; | |
1292 | if (file->f_mode & 2) | |
1293 | inode->i_mode |= S_IWUSR | S_IXUSR; | |
ca99c1da | 1294 | spin_unlock(&files->file_lock); |
1da177e4 LT |
1295 | put_files_struct(files); |
1296 | inode->i_op = &proc_pid_link_inode_operations; | |
1297 | inode->i_size = 64; | |
1298 | ei->op.proc_get_link = proc_fd_link; | |
1299 | dentry->d_op = &tid_fd_dentry_operations; | |
1300 | d_add(dentry, inode); | |
cd6a3ce9 EB |
1301 | /* Close the race of the process dying before we return the dentry */ |
1302 | if (tid_fd_revalidate(dentry, NULL)) | |
1303 | result = NULL; | |
1304 | out: | |
99f89551 EB |
1305 | put_task_struct(task); |
1306 | out_no_task: | |
cd6a3ce9 | 1307 | return result; |
1da177e4 LT |
1308 | |
1309 | out_unlock2: | |
ca99c1da | 1310 | spin_unlock(&files->file_lock); |
1da177e4 LT |
1311 | put_files_struct(files); |
1312 | out_unlock: | |
1313 | iput(inode); | |
cd6a3ce9 | 1314 | goto out; |
1da177e4 LT |
1315 | } |
1316 | ||
28a6d671 EB |
1317 | static int proc_readfd(struct file * filp, void * dirent, filldir_t filldir) |
1318 | { | |
1319 | struct dentry *dentry = filp->f_dentry; | |
1320 | struct inode *inode = dentry->d_inode; | |
1321 | struct task_struct *p = get_proc_task(inode); | |
1322 | unsigned int fd, tid, ino; | |
1323 | int retval; | |
1324 | char buf[PROC_NUMBUF]; | |
1325 | struct files_struct * files; | |
1326 | struct fdtable *fdt; | |
1da177e4 | 1327 | |
28a6d671 EB |
1328 | retval = -ENOENT; |
1329 | if (!p) | |
1330 | goto out_no_task; | |
1331 | retval = 0; | |
1332 | tid = p->pid; | |
1333 | ||
1334 | fd = filp->f_pos; | |
1335 | switch (fd) { | |
1336 | case 0: | |
1337 | if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0) | |
1338 | goto out; | |
1339 | filp->f_pos++; | |
1340 | case 1: | |
1341 | ino = parent_ino(dentry); | |
1342 | if (filldir(dirent, "..", 2, 1, ino, DT_DIR) < 0) | |
1343 | goto out; | |
1344 | filp->f_pos++; | |
1345 | default: | |
1346 | files = get_files_struct(p); | |
1347 | if (!files) | |
1348 | goto out; | |
1349 | rcu_read_lock(); | |
1350 | fdt = files_fdtable(files); | |
1351 | for (fd = filp->f_pos-2; | |
1352 | fd < fdt->max_fds; | |
1353 | fd++, filp->f_pos++) { | |
1354 | unsigned int i,j; | |
1355 | ||
1356 | if (!fcheck_files(files, fd)) | |
1357 | continue; | |
1358 | rcu_read_unlock(); | |
1359 | ||
1360 | j = PROC_NUMBUF; | |
1361 | i = fd; | |
1362 | do { | |
1363 | j--; | |
1364 | buf[j] = '0' + (i % 10); | |
1365 | i /= 10; | |
1366 | } while (i); | |
1367 | ||
1368 | ino = fake_ino(tid, PROC_TID_FD_DIR + fd); | |
1369 | if (filldir(dirent, buf+j, PROC_NUMBUF-j, fd+2, ino, DT_LNK) < 0) { | |
1370 | rcu_read_lock(); | |
1371 | break; | |
1372 | } | |
1373 | rcu_read_lock(); | |
1374 | } | |
1375 | rcu_read_unlock(); | |
1376 | put_files_struct(files); | |
1377 | } | |
1378 | out: | |
1379 | put_task_struct(p); | |
1380 | out_no_task: | |
1381 | return retval; | |
1382 | } | |
1383 | ||
1384 | static struct file_operations proc_fd_operations = { | |
1385 | .read = generic_read_dir, | |
1386 | .readdir = proc_readfd, | |
1da177e4 LT |
1387 | }; |
1388 | ||
1389 | /* | |
1390 | * proc directories can do almost nothing.. | |
1391 | */ | |
1392 | static struct inode_operations proc_fd_inode_operations = { | |
1393 | .lookup = proc_lookupfd, | |
6d76fa58 | 1394 | .setattr = proc_setattr, |
1da177e4 LT |
1395 | }; |
1396 | ||
1da177e4 LT |
1397 | /* SMP-safe */ |
1398 | static struct dentry *proc_pident_lookup(struct inode *dir, | |
1399 | struct dentry *dentry, | |
1400 | struct pid_entry *ents) | |
1401 | { | |
1402 | struct inode *inode; | |
cd6a3ce9 | 1403 | struct dentry *error; |
99f89551 | 1404 | struct task_struct *task = get_proc_task(dir); |
1da177e4 LT |
1405 | struct pid_entry *p; |
1406 | struct proc_inode *ei; | |
1407 | ||
cd6a3ce9 | 1408 | error = ERR_PTR(-ENOENT); |
1da177e4 LT |
1409 | inode = NULL; |
1410 | ||
99f89551 EB |
1411 | if (!task) |
1412 | goto out_no_task; | |
1da177e4 | 1413 | |
20cdc894 EB |
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 | */ | |
1da177e4 LT |
1418 | for (p = ents; p->name; p++) { |
1419 | if (p->len != dentry->d_name.len) | |
1420 | continue; | |
1421 | if (!memcmp(dentry->d_name.name, p->name, p->len)) | |
1422 | break; | |
1423 | } | |
1424 | if (!p->name) | |
1425 | goto out; | |
1426 | ||
cd6a3ce9 | 1427 | error = ERR_PTR(-EINVAL); |
1da177e4 LT |
1428 | inode = proc_pid_make_inode(dir->i_sb, task, p->type); |
1429 | if (!inode) | |
1430 | goto out; | |
1431 | ||
1432 | ei = PROC_I(inode); | |
1433 | inode->i_mode = p->mode; | |
20cdc894 EB |
1434 | if (S_ISDIR(inode->i_mode)) |
1435 | inode->i_nlink = 2; /* Use getattr to fix if necessary */ | |
1436 | if (p->iop) | |
1437 | inode->i_op = p->iop; | |
1438 | if (p->fop) | |
1439 | inode->i_fop = p->fop; | |
1440 | ei->op = p->op; | |
1da177e4 LT |
1441 | dentry->d_op = &pid_dentry_operations; |
1442 | d_add(dentry, inode); | |
cd6a3ce9 EB |
1443 | /* Close the race of the process dying before we return the dentry */ |
1444 | if (pid_revalidate(dentry, NULL)) | |
1445 | error = NULL; | |
1da177e4 | 1446 | out: |
99f89551 EB |
1447 | put_task_struct(task); |
1448 | out_no_task: | |
cd6a3ce9 | 1449 | return error; |
1da177e4 LT |
1450 | } |
1451 | ||
28a6d671 EB |
1452 | static int proc_pident_readdir(struct file *filp, |
1453 | void *dirent, filldir_t filldir, | |
1454 | struct pid_entry *ents, unsigned int nents) | |
1455 | { | |
1456 | int i; | |
1457 | int pid; | |
1458 | struct dentry *dentry = filp->f_dentry; | |
1459 | struct inode *inode = dentry->d_inode; | |
1460 | struct task_struct *task = get_proc_task(inode); | |
1461 | struct pid_entry *p; | |
1462 | ino_t ino; | |
1463 | int ret; | |
1464 | ||
1465 | ret = -ENOENT; | |
1466 | if (!task) | |
1467 | goto out; | |
1468 | ||
1469 | ret = 0; | |
1470 | pid = task->pid; | |
1471 | put_task_struct(task); | |
1472 | i = filp->f_pos; | |
1473 | switch (i) { | |
1474 | case 0: | |
1475 | ino = inode->i_ino; | |
1476 | if (filldir(dirent, ".", 1, i, ino, DT_DIR) < 0) | |
1477 | goto out; | |
1478 | i++; | |
1479 | filp->f_pos++; | |
1480 | /* fall through */ | |
1481 | case 1: | |
1482 | ino = parent_ino(dentry); | |
1483 | if (filldir(dirent, "..", 2, i, ino, DT_DIR) < 0) | |
1484 | goto out; | |
1485 | i++; | |
1486 | filp->f_pos++; | |
1487 | /* fall through */ | |
1488 | default: | |
1489 | i -= 2; | |
1490 | if (i >= nents) { | |
1491 | ret = 1; | |
1492 | goto out; | |
1493 | } | |
1494 | p = ents + i; | |
1495 | while (p->name) { | |
1496 | if (filldir(dirent, p->name, p->len, filp->f_pos, | |
1497 | fake_ino(pid, p->type), p->mode >> 12) < 0) | |
1498 | goto out; | |
1499 | filp->f_pos++; | |
1500 | p++; | |
1501 | } | |
1502 | } | |
1503 | ||
1504 | ret = 1; | |
1505 | out: | |
1506 | return ret; | |
1da177e4 LT |
1507 | } |
1508 | ||
28a6d671 EB |
1509 | #ifdef CONFIG_SECURITY |
1510 | static ssize_t proc_pid_attr_read(struct file * file, char __user * buf, | |
1511 | size_t count, loff_t *ppos) | |
1512 | { | |
1513 | struct inode * inode = file->f_dentry->d_inode; | |
1514 | unsigned long page; | |
1515 | ssize_t length; | |
1516 | struct task_struct *task = get_proc_task(inode); | |
1517 | ||
1518 | length = -ESRCH; | |
1519 | if (!task) | |
1520 | goto out_no_task; | |
1521 | ||
1522 | if (count > PAGE_SIZE) | |
1523 | count = PAGE_SIZE; | |
1524 | length = -ENOMEM; | |
1525 | if (!(page = __get_free_page(GFP_KERNEL))) | |
1526 | goto out; | |
1527 | ||
1528 | length = security_getprocattr(task, | |
1529 | (char*)file->f_dentry->d_name.name, | |
1530 | (void*)page, count); | |
1531 | if (length >= 0) | |
1532 | length = simple_read_from_buffer(buf, count, ppos, (char *)page, length); | |
1533 | free_page(page); | |
1534 | out: | |
1535 | put_task_struct(task); | |
1536 | out_no_task: | |
1537 | return length; | |
1da177e4 LT |
1538 | } |
1539 | ||
28a6d671 EB |
1540 | static ssize_t proc_pid_attr_write(struct file * file, const char __user * buf, |
1541 | size_t count, loff_t *ppos) | |
1542 | { | |
1543 | struct inode * inode = file->f_dentry->d_inode; | |
1544 | char *page; | |
1545 | ssize_t length; | |
1546 | struct task_struct *task = get_proc_task(inode); | |
1547 | ||
1548 | length = -ESRCH; | |
1549 | if (!task) | |
1550 | goto out_no_task; | |
1551 | if (count > PAGE_SIZE) | |
1552 | count = PAGE_SIZE; | |
1553 | ||
1554 | /* No partial writes. */ | |
1555 | length = -EINVAL; | |
1556 | if (*ppos != 0) | |
1557 | goto out; | |
1558 | ||
1559 | length = -ENOMEM; | |
1560 | page = (char*)__get_free_page(GFP_USER); | |
1561 | if (!page) | |
1562 | goto out; | |
1563 | ||
1564 | length = -EFAULT; | |
1565 | if (copy_from_user(page, buf, count)) | |
1566 | goto out_free; | |
1567 | ||
1568 | length = security_setprocattr(task, | |
1569 | (char*)file->f_dentry->d_name.name, | |
1570 | (void*)page, count); | |
1571 | out_free: | |
1572 | free_page((unsigned long) page); | |
1573 | out: | |
1574 | put_task_struct(task); | |
1575 | out_no_task: | |
1576 | return length; | |
1577 | } | |
1578 | ||
1579 | static struct file_operations proc_pid_attr_operations = { | |
1580 | .read = proc_pid_attr_read, | |
1581 | .write = proc_pid_attr_write, | |
1582 | }; | |
1583 | ||
1584 | static struct pid_entry tgid_attr_stuff[] = { | |
20cdc894 EB |
1585 | REG(PROC_TGID_ATTR_CURRENT, "current", S_IRUGO|S_IWUGO, pid_attr), |
1586 | REG(PROC_TGID_ATTR_PREV, "prev", S_IRUGO, pid_attr), | |
1587 | REG(PROC_TGID_ATTR_EXEC, "exec", S_IRUGO|S_IWUGO, pid_attr), | |
1588 | REG(PROC_TGID_ATTR_FSCREATE, "fscreate", S_IRUGO|S_IWUGO, pid_attr), | |
1589 | REG(PROC_TGID_ATTR_KEYCREATE, "keycreate", S_IRUGO|S_IWUGO, pid_attr), | |
1590 | REG(PROC_TGID_ATTR_SOCKCREATE, "sockcreate", S_IRUGO|S_IWUGO, pid_attr), | |
1591 | {} | |
28a6d671 EB |
1592 | }; |
1593 | static struct pid_entry tid_attr_stuff[] = { | |
20cdc894 EB |
1594 | REG(PROC_TID_ATTR_CURRENT, "current", S_IRUGO|S_IWUGO, pid_attr), |
1595 | REG(PROC_TID_ATTR_PREV, "prev", S_IRUGO, pid_attr), | |
1596 | REG(PROC_TID_ATTR_EXEC, "exec", S_IRUGO|S_IWUGO, pid_attr), | |
1597 | REG(PROC_TID_ATTR_FSCREATE, "fscreate", S_IRUGO|S_IWUGO, pid_attr), | |
1598 | REG(PROC_TID_ATTR_KEYCREATE, "keycreate", S_IRUGO|S_IWUGO, pid_attr), | |
1599 | REG(PROC_TID_ATTR_SOCKCREATE, "sockcreate", S_IRUGO|S_IWUGO, pid_attr), | |
1600 | {} | |
28a6d671 EB |
1601 | }; |
1602 | ||
1603 | static int proc_tgid_attr_readdir(struct file * filp, | |
1604 | void * dirent, filldir_t filldir) | |
1605 | { | |
1606 | return proc_pident_readdir(filp,dirent,filldir, | |
1607 | tgid_attr_stuff,ARRAY_SIZE(tgid_attr_stuff)); | |
1608 | } | |
1609 | ||
1610 | static int proc_tid_attr_readdir(struct file * filp, | |
1611 | void * dirent, filldir_t filldir) | |
1612 | { | |
1613 | return proc_pident_readdir(filp,dirent,filldir, | |
1614 | tid_attr_stuff,ARRAY_SIZE(tid_attr_stuff)); | |
1615 | } | |
1616 | ||
1617 | static struct file_operations proc_tgid_attr_operations = { | |
1da177e4 | 1618 | .read = generic_read_dir, |
28a6d671 | 1619 | .readdir = proc_tgid_attr_readdir, |
1da177e4 LT |
1620 | }; |
1621 | ||
28a6d671 | 1622 | static struct file_operations proc_tid_attr_operations = { |
1da177e4 | 1623 | .read = generic_read_dir, |
28a6d671 | 1624 | .readdir = proc_tid_attr_readdir, |
1da177e4 LT |
1625 | }; |
1626 | ||
28a6d671 EB |
1627 | static struct dentry *proc_tgid_attr_lookup(struct inode *dir, |
1628 | struct dentry *dentry, struct nameidata *nd) | |
1629 | { | |
1630 | return proc_pident_lookup(dir, dentry, tgid_attr_stuff); | |
1631 | } | |
1632 | ||
1633 | static struct dentry *proc_tid_attr_lookup(struct inode *dir, | |
1634 | struct dentry *dentry, struct nameidata *nd) | |
1635 | { | |
1636 | return proc_pident_lookup(dir, dentry, tid_attr_stuff); | |
1637 | } | |
1638 | ||
1639 | static struct inode_operations proc_tgid_attr_inode_operations = { | |
1640 | .lookup = proc_tgid_attr_lookup, | |
99f89551 | 1641 | .getattr = pid_getattr, |
6d76fa58 | 1642 | .setattr = proc_setattr, |
1da177e4 LT |
1643 | }; |
1644 | ||
28a6d671 EB |
1645 | static struct inode_operations proc_tid_attr_inode_operations = { |
1646 | .lookup = proc_tid_attr_lookup, | |
99f89551 | 1647 | .getattr = pid_getattr, |
6d76fa58 | 1648 | .setattr = proc_setattr, |
1da177e4 | 1649 | }; |
28a6d671 EB |
1650 | #endif |
1651 | ||
1652 | /* | |
1653 | * /proc/self: | |
1654 | */ | |
1655 | static int proc_self_readlink(struct dentry *dentry, char __user *buffer, | |
1656 | int buflen) | |
1657 | { | |
1658 | char tmp[PROC_NUMBUF]; | |
1659 | sprintf(tmp, "%d", current->tgid); | |
1660 | return vfs_readlink(dentry,buffer,buflen,tmp); | |
1661 | } | |
1662 | ||
1663 | static void *proc_self_follow_link(struct dentry *dentry, struct nameidata *nd) | |
1664 | { | |
1665 | char tmp[PROC_NUMBUF]; | |
1666 | sprintf(tmp, "%d", current->tgid); | |
1667 | return ERR_PTR(vfs_follow_link(nd,tmp)); | |
1668 | } | |
1669 | ||
1670 | static struct inode_operations proc_self_inode_operations = { | |
1671 | .readlink = proc_self_readlink, | |
1672 | .follow_link = proc_self_follow_link, | |
1673 | }; | |
1674 | ||
1675 | /* | |
1676 | * Thread groups | |
1677 | */ | |
20cdc894 EB |
1678 | static struct file_operations proc_task_operations; |
1679 | static struct inode_operations proc_task_inode_operations; | |
1680 | ||
28a6d671 | 1681 | static struct pid_entry tgid_base_stuff[] = { |
20cdc894 EB |
1682 | DIR(PROC_TGID_TASK, "task", S_IRUGO|S_IXUGO, task), |
1683 | DIR(PROC_TGID_FD, "fd", S_IRUSR|S_IXUSR, fd), | |
1684 | INF(PROC_TGID_ENVIRON, "environ", S_IRUSR, pid_environ), | |
1685 | INF(PROC_TGID_AUXV, "auxv", S_IRUSR, pid_auxv), | |
1686 | INF(PROC_TGID_STATUS, "status", S_IRUGO, pid_status), | |
1687 | INF(PROC_TGID_CMDLINE, "cmdline", S_IRUGO, pid_cmdline), | |
1688 | INF(PROC_TGID_STAT, "stat", S_IRUGO, tgid_stat), | |
1689 | INF(PROC_TGID_STATM, "statm", S_IRUGO, pid_statm), | |
1690 | REG(PROC_TGID_MAPS, "maps", S_IRUGO, maps), | |
28a6d671 | 1691 | #ifdef CONFIG_NUMA |
20cdc894 | 1692 | REG(PROC_TGID_NUMA_MAPS, "numa_maps", S_IRUGO, numa_maps), |
28a6d671 | 1693 | #endif |
20cdc894 | 1694 | REG(PROC_TGID_MEM, "mem", S_IRUSR|S_IWUSR, mem), |
28a6d671 | 1695 | #ifdef CONFIG_SECCOMP |
20cdc894 | 1696 | REG(PROC_TGID_SECCOMP, "seccomp", S_IRUSR|S_IWUSR, seccomp), |
28a6d671 | 1697 | #endif |
20cdc894 EB |
1698 | LNK(PROC_TGID_CWD, "cwd", cwd), |
1699 | LNK(PROC_TGID_ROOT, "root", root), | |
1700 | LNK(PROC_TGID_EXE, "exe", exe), | |
1701 | REG(PROC_TGID_MOUNTS, "mounts", S_IRUGO, mounts), | |
1702 | REG(PROC_TGID_MOUNTSTATS, "mountstats", S_IRUSR, mountstats), | |
28a6d671 | 1703 | #ifdef CONFIG_MMU |
20cdc894 | 1704 | REG(PROC_TGID_SMAPS, "smaps", S_IRUGO, smaps), |
28a6d671 EB |
1705 | #endif |
1706 | #ifdef CONFIG_SECURITY | |
20cdc894 | 1707 | DIR(PROC_TGID_ATTR, "attr", S_IRUGO|S_IXUGO, tgid_attr), |
28a6d671 EB |
1708 | #endif |
1709 | #ifdef CONFIG_KALLSYMS | |
20cdc894 | 1710 | INF(PROC_TGID_WCHAN, "wchan", S_IRUGO, pid_wchan), |
28a6d671 EB |
1711 | #endif |
1712 | #ifdef CONFIG_SCHEDSTATS | |
20cdc894 | 1713 | INF(PROC_TGID_SCHEDSTAT, "schedstat", S_IRUGO, pid_schedstat), |
28a6d671 EB |
1714 | #endif |
1715 | #ifdef CONFIG_CPUSETS | |
20cdc894 | 1716 | REG(PROC_TGID_CPUSET, "cpuset", S_IRUGO, cpuset), |
28a6d671 | 1717 | #endif |
20cdc894 EB |
1718 | INF(PROC_TGID_OOM_SCORE, "oom_score", S_IRUGO, oom_score), |
1719 | REG(PROC_TGID_OOM_ADJUST, "oom_adj", S_IRUGO|S_IWUSR, oom_adjust), | |
28a6d671 | 1720 | #ifdef CONFIG_AUDITSYSCALL |
20cdc894 | 1721 | REG(PROC_TGID_LOGINUID, "loginuid", S_IWUSR|S_IRUGO, loginuid), |
28a6d671 | 1722 | #endif |
20cdc894 | 1723 | {} |
28a6d671 | 1724 | }; |
1da177e4 | 1725 | |
28a6d671 | 1726 | static int proc_tgid_base_readdir(struct file * filp, |
1da177e4 LT |
1727 | void * dirent, filldir_t filldir) |
1728 | { | |
1729 | return proc_pident_readdir(filp,dirent,filldir, | |
28a6d671 | 1730 | tgid_base_stuff,ARRAY_SIZE(tgid_base_stuff)); |
1da177e4 LT |
1731 | } |
1732 | ||
28a6d671 | 1733 | static struct file_operations proc_tgid_base_operations = { |
1da177e4 | 1734 | .read = generic_read_dir, |
28a6d671 | 1735 | .readdir = proc_tgid_base_readdir, |
1da177e4 LT |
1736 | }; |
1737 | ||
28a6d671 EB |
1738 | static struct dentry *proc_tgid_base_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd){ |
1739 | return proc_pident_lookup(dir, dentry, tgid_base_stuff); | |
1da177e4 LT |
1740 | } |
1741 | ||
28a6d671 EB |
1742 | static struct inode_operations proc_tgid_base_inode_operations = { |
1743 | .lookup = proc_tgid_base_lookup, | |
99f89551 | 1744 | .getattr = pid_getattr, |
6d76fa58 | 1745 | .setattr = proc_setattr, |
1da177e4 | 1746 | }; |
1da177e4 LT |
1747 | |
1748 | /** | |
48e6484d EB |
1749 | * proc_flush_task - Remove dcache entries for @task from the /proc dcache. |
1750 | * | |
1751 | * @task: task that should be flushed. | |
1752 | * | |
1753 | * Looks in the dcache for | |
1754 | * /proc/@pid | |
1755 | * /proc/@tgid/task/@pid | |
1756 | * if either directory is present flushes it and all of it'ts children | |
1757 | * from the dcache. | |
1da177e4 | 1758 | * |
48e6484d EB |
1759 | * It is safe and reasonable to cache /proc entries for a task until |
1760 | * that task exits. After that they just clog up the dcache with | |
1761 | * useless entries, possibly causing useful dcache entries to be | |
1762 | * flushed instead. This routine is proved to flush those useless | |
1763 | * dcache entries at process exit time. | |
1da177e4 | 1764 | * |
48e6484d EB |
1765 | * NOTE: This routine is just an optimization so it does not guarantee |
1766 | * that no dcache entries will exist at process exit time it | |
1767 | * just makes it very unlikely that any will persist. | |
1da177e4 | 1768 | */ |
48e6484d | 1769 | void proc_flush_task(struct task_struct *task) |
1da177e4 | 1770 | { |
48e6484d | 1771 | struct dentry *dentry, *leader, *dir; |
8578cea7 | 1772 | char buf[PROC_NUMBUF]; |
48e6484d EB |
1773 | struct qstr name; |
1774 | ||
1775 | name.name = buf; | |
1776 | name.len = snprintf(buf, sizeof(buf), "%d", task->pid); | |
1777 | dentry = d_hash_and_lookup(proc_mnt->mnt_root, &name); | |
1778 | if (dentry) { | |
1779 | shrink_dcache_parent(dentry); | |
1780 | d_drop(dentry); | |
1781 | dput(dentry); | |
1782 | } | |
1da177e4 | 1783 | |
48e6484d EB |
1784 | if (thread_group_leader(task)) |
1785 | goto out; | |
1da177e4 | 1786 | |
48e6484d EB |
1787 | name.name = buf; |
1788 | name.len = snprintf(buf, sizeof(buf), "%d", task->tgid); | |
1789 | leader = d_hash_and_lookup(proc_mnt->mnt_root, &name); | |
1790 | if (!leader) | |
1791 | goto out; | |
1da177e4 | 1792 | |
48e6484d EB |
1793 | name.name = "task"; |
1794 | name.len = strlen(name.name); | |
1795 | dir = d_hash_and_lookup(leader, &name); | |
1796 | if (!dir) | |
1797 | goto out_put_leader; | |
1798 | ||
1799 | name.name = buf; | |
1800 | name.len = snprintf(buf, sizeof(buf), "%d", task->pid); | |
1801 | dentry = d_hash_and_lookup(dir, &name); | |
1802 | if (dentry) { | |
1803 | shrink_dcache_parent(dentry); | |
1804 | d_drop(dentry); | |
1805 | dput(dentry); | |
1da177e4 | 1806 | } |
48e6484d EB |
1807 | |
1808 | dput(dir); | |
1809 | out_put_leader: | |
1810 | dput(leader); | |
1811 | out: | |
1812 | return; | |
1da177e4 LT |
1813 | } |
1814 | ||
1815 | /* SMP-safe */ | |
1816 | struct dentry *proc_pid_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd) | |
1817 | { | |
cd6a3ce9 | 1818 | struct dentry *result = ERR_PTR(-ENOENT); |
1da177e4 LT |
1819 | struct task_struct *task; |
1820 | struct inode *inode; | |
1821 | struct proc_inode *ei; | |
1822 | unsigned tgid; | |
1da177e4 LT |
1823 | |
1824 | if (dentry->d_name.len == 4 && !memcmp(dentry->d_name.name,"self",4)) { | |
1825 | inode = new_inode(dir->i_sb); | |
1826 | if (!inode) | |
1827 | return ERR_PTR(-ENOMEM); | |
1828 | ei = PROC_I(inode); | |
1829 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; | |
1830 | inode->i_ino = fake_ino(0, PROC_TGID_INO); | |
1831 | ei->pde = NULL; | |
1832 | inode->i_mode = S_IFLNK|S_IRWXUGO; | |
1833 | inode->i_uid = inode->i_gid = 0; | |
1834 | inode->i_size = 64; | |
1835 | inode->i_op = &proc_self_inode_operations; | |
1836 | d_add(dentry, inode); | |
1837 | return NULL; | |
1838 | } | |
1839 | tgid = name_to_int(dentry); | |
1840 | if (tgid == ~0U) | |
1841 | goto out; | |
1842 | ||
de758734 | 1843 | rcu_read_lock(); |
1da177e4 LT |
1844 | task = find_task_by_pid(tgid); |
1845 | if (task) | |
1846 | get_task_struct(task); | |
de758734 | 1847 | rcu_read_unlock(); |
1da177e4 LT |
1848 | if (!task) |
1849 | goto out; | |
1850 | ||
1851 | inode = proc_pid_make_inode(dir->i_sb, task, PROC_TGID_INO); | |
cd6a3ce9 EB |
1852 | if (!inode) |
1853 | goto out_put_task; | |
1da177e4 | 1854 | |
1da177e4 LT |
1855 | inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO; |
1856 | inode->i_op = &proc_tgid_base_inode_operations; | |
1857 | inode->i_fop = &proc_tgid_base_operations; | |
1da177e4 | 1858 | inode->i_flags|=S_IMMUTABLE; |
bcf88e11 DD |
1859 | #ifdef CONFIG_SECURITY |
1860 | inode->i_nlink = 5; | |
1861 | #else | |
1862 | inode->i_nlink = 4; | |
1863 | #endif | |
1da177e4 | 1864 | |
48e6484d | 1865 | dentry->d_op = &pid_dentry_operations; |
1da177e4 | 1866 | |
1da177e4 | 1867 | d_add(dentry, inode); |
cd6a3ce9 EB |
1868 | /* Close the race of the process dying before we return the dentry */ |
1869 | if (pid_revalidate(dentry, NULL)) | |
1870 | result = NULL; | |
1da177e4 | 1871 | |
cd6a3ce9 | 1872 | out_put_task: |
1da177e4 | 1873 | put_task_struct(task); |
1da177e4 | 1874 | out: |
cd6a3ce9 | 1875 | return result; |
1da177e4 LT |
1876 | } |
1877 | ||
1da177e4 | 1878 | /* |
0804ef4b | 1879 | * Find the first task with tgid >= tgid |
0bc58a91 | 1880 | * |
1da177e4 | 1881 | */ |
0804ef4b | 1882 | static struct task_struct *next_tgid(unsigned int tgid) |
1da177e4 | 1883 | { |
0804ef4b EB |
1884 | struct task_struct *task; |
1885 | struct pid *pid; | |
1da177e4 | 1886 | |
454cc105 | 1887 | rcu_read_lock(); |
0804ef4b EB |
1888 | retry: |
1889 | task = NULL; | |
1890 | pid = find_ge_pid(tgid); | |
1891 | if (pid) { | |
1892 | tgid = pid->nr + 1; | |
1893 | task = pid_task(pid, PIDTYPE_PID); | |
1894 | /* What we to know is if the pid we have find is the | |
1895 | * pid of a thread_group_leader. Testing for task | |
1896 | * being a thread_group_leader is the obvious thing | |
1897 | * todo but there is a window when it fails, due to | |
1898 | * the pid transfer logic in de_thread. | |
1899 | * | |
1900 | * So we perform the straight forward test of seeing | |
1901 | * if the pid we have found is the pid of a thread | |
1902 | * group leader, and don't worry if the task we have | |
1903 | * found doesn't happen to be a thread group leader. | |
1904 | * As we don't care in the case of readdir. | |
1905 | */ | |
1906 | if (!task || !has_group_leader_pid(task)) | |
1907 | goto retry; | |
1908 | get_task_struct(task); | |
0bc58a91 | 1909 | } |
454cc105 | 1910 | rcu_read_unlock(); |
0804ef4b | 1911 | return task; |
1da177e4 LT |
1912 | } |
1913 | ||
0804ef4b EB |
1914 | #define TGID_OFFSET (FIRST_PROCESS_ENTRY + (1 /* /proc/self */)) |
1915 | ||
1da177e4 LT |
1916 | /* for the /proc/ directory itself, after non-process stuff has been done */ |
1917 | int proc_pid_readdir(struct file * filp, void * dirent, filldir_t filldir) | |
1918 | { | |
1da177e4 LT |
1919 | char buf[PROC_NUMBUF]; |
1920 | unsigned int nr = filp->f_pos - FIRST_PROCESS_ENTRY; | |
0bc58a91 EB |
1921 | struct task_struct *task; |
1922 | int tgid; | |
1da177e4 LT |
1923 | |
1924 | if (!nr) { | |
1925 | ino_t ino = fake_ino(0,PROC_TGID_INO); | |
1926 | if (filldir(dirent, "self", 4, filp->f_pos, ino, DT_LNK) < 0) | |
1927 | return 0; | |
1928 | filp->f_pos++; | |
1929 | nr++; | |
1930 | } | |
1931 | ||
0804ef4b EB |
1932 | tgid = filp->f_pos - TGID_OFFSET; |
1933 | for (task = next_tgid(tgid); | |
0bc58a91 | 1934 | task; |
0804ef4b | 1935 | put_task_struct(task), task = next_tgid(tgid + 1)) { |
0bc58a91 EB |
1936 | int len; |
1937 | ino_t ino; | |
1938 | tgid = task->pid; | |
0804ef4b | 1939 | filp->f_pos = tgid + TGID_OFFSET; |
0bc58a91 EB |
1940 | len = snprintf(buf, sizeof(buf), "%d", tgid); |
1941 | ino = fake_ino(tgid, PROC_TGID_INO); | |
1942 | if (filldir(dirent, buf, len, filp->f_pos, ino, DT_DIR) < 0) { | |
0bc58a91 | 1943 | put_task_struct(task); |
0804ef4b | 1944 | goto out; |
1da177e4 | 1945 | } |
0bc58a91 | 1946 | } |
0804ef4b EB |
1947 | filp->f_pos = PID_MAX_LIMIT + TGID_OFFSET; |
1948 | out: | |
0bc58a91 EB |
1949 | return 0; |
1950 | } | |
1da177e4 | 1951 | |
28a6d671 EB |
1952 | /* |
1953 | * Tasks | |
1954 | */ | |
1955 | static struct pid_entry tid_base_stuff[] = { | |
20cdc894 EB |
1956 | DIR(PROC_TID_FD, "fd", S_IRUSR|S_IXUSR, fd), |
1957 | INF(PROC_TID_ENVIRON, "environ", S_IRUSR, pid_environ), | |
1958 | INF(PROC_TID_AUXV, "auxv", S_IRUSR, pid_auxv), | |
1959 | INF(PROC_TID_STATUS, "status", S_IRUGO, pid_status), | |
1960 | INF(PROC_TID_CMDLINE, "cmdline", S_IRUGO, pid_cmdline), | |
1961 | INF(PROC_TID_STAT, "stat", S_IRUGO, tid_stat), | |
1962 | INF(PROC_TID_STATM, "statm", S_IRUGO, pid_statm), | |
1963 | REG(PROC_TID_MAPS, "maps", S_IRUGO, maps), | |
28a6d671 | 1964 | #ifdef CONFIG_NUMA |
20cdc894 | 1965 | REG(PROC_TID_NUMA_MAPS, "numa_maps", S_IRUGO, numa_maps), |
28a6d671 | 1966 | #endif |
20cdc894 | 1967 | REG(PROC_TID_MEM, "mem", S_IRUSR|S_IWUSR, mem), |
28a6d671 | 1968 | #ifdef CONFIG_SECCOMP |
20cdc894 | 1969 | REG(PROC_TID_SECCOMP, "seccomp", S_IRUSR|S_IWUSR, seccomp), |
28a6d671 | 1970 | #endif |
20cdc894 EB |
1971 | LNK(PROC_TID_CWD, "cwd", cwd), |
1972 | LNK(PROC_TID_ROOT, "root", root), | |
1973 | LNK(PROC_TID_EXE, "exe", exe), | |
1974 | REG(PROC_TID_MOUNTS, "mounts", S_IRUGO, mounts), | |
28a6d671 | 1975 | #ifdef CONFIG_MMU |
20cdc894 | 1976 | REG(PROC_TID_SMAPS, "smaps", S_IRUGO, smaps), |
28a6d671 EB |
1977 | #endif |
1978 | #ifdef CONFIG_SECURITY | |
20cdc894 | 1979 | DIR(PROC_TID_ATTR, "attr", S_IRUGO|S_IXUGO, tid_attr), |
28a6d671 EB |
1980 | #endif |
1981 | #ifdef CONFIG_KALLSYMS | |
20cdc894 | 1982 | INF(PROC_TID_WCHAN, "wchan", S_IRUGO, pid_wchan), |
28a6d671 EB |
1983 | #endif |
1984 | #ifdef CONFIG_SCHEDSTATS | |
20cdc894 | 1985 | INF(PROC_TID_SCHEDSTAT, "schedstat", S_IRUGO, pid_schedstat), |
28a6d671 EB |
1986 | #endif |
1987 | #ifdef CONFIG_CPUSETS | |
20cdc894 | 1988 | REG(PROC_TID_CPUSET, "cpuset", S_IRUGO, cpuset), |
28a6d671 | 1989 | #endif |
20cdc894 EB |
1990 | INF(PROC_TID_OOM_SCORE, "oom_score", S_IRUGO, oom_score), |
1991 | REG(PROC_TID_OOM_ADJUST, "oom_adj", S_IRUGO|S_IWUSR, oom_adjust), | |
28a6d671 | 1992 | #ifdef CONFIG_AUDITSYSCALL |
20cdc894 | 1993 | REG(PROC_TID_LOGINUID, "loginuid", S_IWUSR|S_IRUGO, loginuid), |
28a6d671 | 1994 | #endif |
20cdc894 | 1995 | {} |
28a6d671 EB |
1996 | }; |
1997 | ||
1998 | static int proc_tid_base_readdir(struct file * filp, | |
1999 | void * dirent, filldir_t filldir) | |
2000 | { | |
2001 | return proc_pident_readdir(filp,dirent,filldir, | |
2002 | tid_base_stuff,ARRAY_SIZE(tid_base_stuff)); | |
2003 | } | |
2004 | ||
2005 | static struct dentry *proc_tid_base_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd){ | |
2006 | return proc_pident_lookup(dir, dentry, tid_base_stuff); | |
2007 | } | |
2008 | ||
2009 | static struct file_operations proc_tid_base_operations = { | |
2010 | .read = generic_read_dir, | |
2011 | .readdir = proc_tid_base_readdir, | |
2012 | }; | |
2013 | ||
2014 | static struct inode_operations proc_tid_base_inode_operations = { | |
2015 | .lookup = proc_tid_base_lookup, | |
2016 | .getattr = pid_getattr, | |
2017 | .setattr = proc_setattr, | |
2018 | }; | |
2019 | ||
2020 | /* SMP-safe */ | |
2021 | static struct dentry *proc_task_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd) | |
2022 | { | |
2023 | struct dentry *result = ERR_PTR(-ENOENT); | |
2024 | struct task_struct *task; | |
2025 | struct task_struct *leader = get_proc_task(dir); | |
2026 | struct inode *inode; | |
2027 | unsigned tid; | |
2028 | ||
2029 | if (!leader) | |
2030 | goto out_no_task; | |
2031 | ||
2032 | tid = name_to_int(dentry); | |
2033 | if (tid == ~0U) | |
2034 | goto out; | |
2035 | ||
2036 | rcu_read_lock(); | |
2037 | task = find_task_by_pid(tid); | |
2038 | if (task) | |
2039 | get_task_struct(task); | |
2040 | rcu_read_unlock(); | |
2041 | if (!task) | |
2042 | goto out; | |
2043 | if (leader->tgid != task->tgid) | |
2044 | goto out_drop_task; | |
2045 | ||
2046 | inode = proc_pid_make_inode(dir->i_sb, task, PROC_TID_INO); | |
2047 | ||
2048 | ||
2049 | if (!inode) | |
2050 | goto out_drop_task; | |
2051 | inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO; | |
2052 | inode->i_op = &proc_tid_base_inode_operations; | |
2053 | inode->i_fop = &proc_tid_base_operations; | |
2054 | inode->i_flags|=S_IMMUTABLE; | |
2055 | #ifdef CONFIG_SECURITY | |
2056 | inode->i_nlink = 4; | |
2057 | #else | |
2058 | inode->i_nlink = 3; | |
2059 | #endif | |
2060 | ||
2061 | dentry->d_op = &pid_dentry_operations; | |
2062 | ||
2063 | d_add(dentry, inode); | |
2064 | /* Close the race of the process dying before we return the dentry */ | |
2065 | if (pid_revalidate(dentry, NULL)) | |
2066 | result = NULL; | |
2067 | ||
2068 | out_drop_task: | |
2069 | put_task_struct(task); | |
2070 | out: | |
2071 | put_task_struct(leader); | |
2072 | out_no_task: | |
2073 | return result; | |
2074 | } | |
2075 | ||
0bc58a91 EB |
2076 | /* |
2077 | * Find the first tid of a thread group to return to user space. | |
2078 | * | |
2079 | * Usually this is just the thread group leader, but if the users | |
2080 | * buffer was too small or there was a seek into the middle of the | |
2081 | * directory we have more work todo. | |
2082 | * | |
2083 | * In the case of a short read we start with find_task_by_pid. | |
2084 | * | |
2085 | * In the case of a seek we start with the leader and walk nr | |
2086 | * threads past it. | |
2087 | */ | |
cc288738 EB |
2088 | static struct task_struct *first_tid(struct task_struct *leader, |
2089 | int tid, int nr) | |
0bc58a91 | 2090 | { |
a872ff0c | 2091 | struct task_struct *pos; |
1da177e4 | 2092 | |
cc288738 | 2093 | rcu_read_lock(); |
0bc58a91 EB |
2094 | /* Attempt to start with the pid of a thread */ |
2095 | if (tid && (nr > 0)) { | |
2096 | pos = find_task_by_pid(tid); | |
a872ff0c ON |
2097 | if (pos && (pos->group_leader == leader)) |
2098 | goto found; | |
0bc58a91 | 2099 | } |
1da177e4 | 2100 | |
0bc58a91 | 2101 | /* If nr exceeds the number of threads there is nothing todo */ |
a872ff0c ON |
2102 | pos = NULL; |
2103 | if (nr && nr >= get_nr_threads(leader)) | |
2104 | goto out; | |
1da177e4 | 2105 | |
a872ff0c ON |
2106 | /* If we haven't found our starting place yet start |
2107 | * with the leader and walk nr threads forward. | |
0bc58a91 | 2108 | */ |
a872ff0c ON |
2109 | for (pos = leader; nr > 0; --nr) { |
2110 | pos = next_thread(pos); | |
2111 | if (pos == leader) { | |
2112 | pos = NULL; | |
2113 | goto out; | |
2114 | } | |
1da177e4 | 2115 | } |
a872ff0c ON |
2116 | found: |
2117 | get_task_struct(pos); | |
2118 | out: | |
cc288738 | 2119 | rcu_read_unlock(); |
0bc58a91 EB |
2120 | return pos; |
2121 | } | |
2122 | ||
2123 | /* | |
2124 | * Find the next thread in the thread list. | |
2125 | * Return NULL if there is an error or no next thread. | |
2126 | * | |
2127 | * The reference to the input task_struct is released. | |
2128 | */ | |
2129 | static struct task_struct *next_tid(struct task_struct *start) | |
2130 | { | |
c1df7fb8 | 2131 | struct task_struct *pos = NULL; |
cc288738 | 2132 | rcu_read_lock(); |
c1df7fb8 | 2133 | if (pid_alive(start)) { |
0bc58a91 | 2134 | pos = next_thread(start); |
c1df7fb8 ON |
2135 | if (thread_group_leader(pos)) |
2136 | pos = NULL; | |
2137 | else | |
2138 | get_task_struct(pos); | |
2139 | } | |
cc288738 | 2140 | rcu_read_unlock(); |
0bc58a91 EB |
2141 | put_task_struct(start); |
2142 | return pos; | |
1da177e4 LT |
2143 | } |
2144 | ||
2145 | /* for the /proc/TGID/task/ directories */ | |
2146 | static int proc_task_readdir(struct file * filp, void * dirent, filldir_t filldir) | |
2147 | { | |
1da177e4 | 2148 | char buf[PROC_NUMBUF]; |
1da177e4 LT |
2149 | struct dentry *dentry = filp->f_dentry; |
2150 | struct inode *inode = dentry->d_inode; | |
99f89551 | 2151 | struct task_struct *leader = get_proc_task(inode); |
0bc58a91 | 2152 | struct task_struct *task; |
1da177e4 LT |
2153 | int retval = -ENOENT; |
2154 | ino_t ino; | |
0bc58a91 | 2155 | int tid; |
1da177e4 LT |
2156 | unsigned long pos = filp->f_pos; /* avoiding "long long" filp->f_pos */ |
2157 | ||
99f89551 EB |
2158 | if (!leader) |
2159 | goto out_no_task; | |
1da177e4 LT |
2160 | retval = 0; |
2161 | ||
2162 | switch (pos) { | |
2163 | case 0: | |
2164 | ino = inode->i_ino; | |
2165 | if (filldir(dirent, ".", 1, pos, ino, DT_DIR) < 0) | |
2166 | goto out; | |
2167 | pos++; | |
2168 | /* fall through */ | |
2169 | case 1: | |
2170 | ino = parent_ino(dentry); | |
2171 | if (filldir(dirent, "..", 2, pos, ino, DT_DIR) < 0) | |
2172 | goto out; | |
2173 | pos++; | |
2174 | /* fall through */ | |
2175 | } | |
2176 | ||
0bc58a91 EB |
2177 | /* f_version caches the tgid value that the last readdir call couldn't |
2178 | * return. lseek aka telldir automagically resets f_version to 0. | |
2179 | */ | |
2180 | tid = filp->f_version; | |
2181 | filp->f_version = 0; | |
2182 | for (task = first_tid(leader, tid, pos - 2); | |
2183 | task; | |
2184 | task = next_tid(task), pos++) { | |
2185 | int len; | |
2186 | tid = task->pid; | |
2187 | len = snprintf(buf, sizeof(buf), "%d", tid); | |
2188 | ino = fake_ino(tid, PROC_TID_INO); | |
2189 | if (filldir(dirent, buf, len, pos, ino, DT_DIR < 0)) { | |
2190 | /* returning this tgid failed, save it as the first | |
2191 | * pid for the next readir call */ | |
2192 | filp->f_version = tid; | |
2193 | put_task_struct(task); | |
1da177e4 | 2194 | break; |
0bc58a91 | 2195 | } |
1da177e4 LT |
2196 | } |
2197 | out: | |
2198 | filp->f_pos = pos; | |
99f89551 EB |
2199 | put_task_struct(leader); |
2200 | out_no_task: | |
1da177e4 LT |
2201 | return retval; |
2202 | } | |
6e66b52b EB |
2203 | |
2204 | static int proc_task_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) | |
2205 | { | |
2206 | struct inode *inode = dentry->d_inode; | |
99f89551 | 2207 | struct task_struct *p = get_proc_task(inode); |
6e66b52b EB |
2208 | generic_fillattr(inode, stat); |
2209 | ||
99f89551 EB |
2210 | if (p) { |
2211 | rcu_read_lock(); | |
2212 | stat->nlink += get_nr_threads(p); | |
2213 | rcu_read_unlock(); | |
2214 | put_task_struct(p); | |
6e66b52b EB |
2215 | } |
2216 | ||
2217 | return 0; | |
2218 | } | |
28a6d671 EB |
2219 | |
2220 | static struct inode_operations proc_task_inode_operations = { | |
2221 | .lookup = proc_task_lookup, | |
2222 | .getattr = proc_task_getattr, | |
2223 | .setattr = proc_setattr, | |
2224 | }; | |
2225 | ||
2226 | static struct file_operations proc_task_operations = { | |
2227 | .read = generic_read_dir, | |
2228 | .readdir = proc_task_readdir, | |
2229 | }; |