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[PATCH] ARM: Fix VFP to use do_div()
[linux-2.6/verdex.git] / fs / proc / base.c
blobace151fa487865fd160546d27c07e31384fa17c9
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.
14 */
15
16 #include <asm/uaccess.h>
17
18 #include <linux/config.h>
19 #include <linux/errno.h>
20 #include <linux/time.h>
21 #include <linux/proc_fs.h>
22 #include <linux/stat.h>
23 #include <linux/init.h>
24 #include <linux/file.h>
25 #include <linux/string.h>
26 #include <linux/seq_file.h>
27 #include <linux/namei.h>
28 #include <linux/namespace.h>
29 #include <linux/mm.h>
30 #include <linux/smp_lock.h>
31 #include <linux/kallsyms.h>
32 #include <linux/mount.h>
33 #include <linux/security.h>
34 #include <linux/ptrace.h>
35 #include <linux/seccomp.h>
36 #include <linux/cpuset.h>
37 #include <linux/audit.h>
38 #include "internal.h"
39
40 /*
41 * For hysterical raisins we keep the same inumbers as in the old procfs.
42 * Feel free to change the macro below - just keep the range distinct from
43 * inumbers of the rest of procfs (currently those are in 0x0000--0xffff).
44 * As soon as we'll get a separate superblock we will be able to forget
45 * about magical ranges too.
46 */
47
48 #define fake_ino(pid,ino) (((pid)<<16)|(ino))
49
50 enum pid_directory_inos {
51 PROC_TGID_INO = 2,
52 PROC_TGID_TASK,
53 PROC_TGID_STATUS,
54 PROC_TGID_MEM,
55 #ifdef CONFIG_SECCOMP
56 PROC_TGID_SECCOMP,
57 #endif
58 PROC_TGID_CWD,
59 PROC_TGID_ROOT,
60 PROC_TGID_EXE,
61 PROC_TGID_FD,
62 PROC_TGID_ENVIRON,
63 PROC_TGID_AUXV,
64 PROC_TGID_CMDLINE,
65 PROC_TGID_STAT,
66 PROC_TGID_STATM,
67 PROC_TGID_MAPS,
68 PROC_TGID_MOUNTS,
69 PROC_TGID_WCHAN,
70 #ifdef CONFIG_SCHEDSTATS
71 PROC_TGID_SCHEDSTAT,
72 #endif
73 #ifdef CONFIG_CPUSETS
74 PROC_TGID_CPUSET,
75 #endif
76 #ifdef CONFIG_SECURITY
77 PROC_TGID_ATTR,
78 PROC_TGID_ATTR_CURRENT,
79 PROC_TGID_ATTR_PREV,
80 PROC_TGID_ATTR_EXEC,
81 PROC_TGID_ATTR_FSCREATE,
82 #endif
83 #ifdef CONFIG_AUDITSYSCALL
84 PROC_TGID_LOGINUID,
85 #endif
86 PROC_TGID_FD_DIR,
87 PROC_TGID_OOM_SCORE,
88 PROC_TGID_OOM_ADJUST,
89 PROC_TID_INO,
90 PROC_TID_STATUS,
91 PROC_TID_MEM,
92 #ifdef CONFIG_SECCOMP
93 PROC_TID_SECCOMP,
94 #endif
95 PROC_TID_CWD,
96 PROC_TID_ROOT,
97 PROC_TID_EXE,
98 PROC_TID_FD,
99 PROC_TID_ENVIRON,
100 PROC_TID_AUXV,
101 PROC_TID_CMDLINE,
102 PROC_TID_STAT,
103 PROC_TID_STATM,
104 PROC_TID_MAPS,
105 PROC_TID_MOUNTS,
106 PROC_TID_WCHAN,
107 #ifdef CONFIG_SCHEDSTATS
108 PROC_TID_SCHEDSTAT,
109 #endif
110 #ifdef CONFIG_CPUSETS
111 PROC_TID_CPUSET,
112 #endif
113 #ifdef CONFIG_SECURITY
114 PROC_TID_ATTR,
115 PROC_TID_ATTR_CURRENT,
116 PROC_TID_ATTR_PREV,
117 PROC_TID_ATTR_EXEC,
118 PROC_TID_ATTR_FSCREATE,
119 #endif
120 #ifdef CONFIG_AUDITSYSCALL
121 PROC_TID_LOGINUID,
122 #endif
123 PROC_TID_FD_DIR = 0x8000, /* 0x8000-0xffff */
124 PROC_TID_OOM_SCORE,
125 PROC_TID_OOM_ADJUST,
126 };
127
128 struct pid_entry {
129 int type;
130 int len;
131 char *name;
132 mode_t mode;
133 };
134
135 #define E(type,name,mode) {(type),sizeof(name)-1,(name),(mode)}
136
137 static struct pid_entry tgid_base_stuff[] = {
138 E(PROC_TGID_TASK, "task", S_IFDIR|S_IRUGO|S_IXUGO),
139 E(PROC_TGID_FD, "fd", S_IFDIR|S_IRUSR|S_IXUSR),
140 E(PROC_TGID_ENVIRON, "environ", S_IFREG|S_IRUSR),
141 E(PROC_TGID_AUXV, "auxv", S_IFREG|S_IRUSR),
142 E(PROC_TGID_STATUS, "status", S_IFREG|S_IRUGO),
143 E(PROC_TGID_CMDLINE, "cmdline", S_IFREG|S_IRUGO),
144 E(PROC_TGID_STAT, "stat", S_IFREG|S_IRUGO),
145 E(PROC_TGID_STATM, "statm", S_IFREG|S_IRUGO),
146 E(PROC_TGID_MAPS, "maps", S_IFREG|S_IRUGO),
147 E(PROC_TGID_MEM, "mem", S_IFREG|S_IRUSR|S_IWUSR),
148 #ifdef CONFIG_SECCOMP
149 E(PROC_TGID_SECCOMP, "seccomp", S_IFREG|S_IRUSR|S_IWUSR),
150 #endif
151 E(PROC_TGID_CWD, "cwd", S_IFLNK|S_IRWXUGO),
152 E(PROC_TGID_ROOT, "root", S_IFLNK|S_IRWXUGO),
153 E(PROC_TGID_EXE, "exe", S_IFLNK|S_IRWXUGO),
154 E(PROC_TGID_MOUNTS, "mounts", S_IFREG|S_IRUGO),
155 #ifdef CONFIG_SECURITY
156 E(PROC_TGID_ATTR, "attr", S_IFDIR|S_IRUGO|S_IXUGO),
157 #endif
158 #ifdef CONFIG_KALLSYMS
159 E(PROC_TGID_WCHAN, "wchan", S_IFREG|S_IRUGO),
160 #endif
161 #ifdef CONFIG_SCHEDSTATS
162 E(PROC_TGID_SCHEDSTAT, "schedstat", S_IFREG|S_IRUGO),
163 #endif
164 #ifdef CONFIG_CPUSETS
165 E(PROC_TGID_CPUSET, "cpuset", S_IFREG|S_IRUGO),
166 #endif
167 E(PROC_TGID_OOM_SCORE, "oom_score",S_IFREG|S_IRUGO),
168 E(PROC_TGID_OOM_ADJUST,"oom_adj", S_IFREG|S_IRUGO|S_IWUSR),
169 #ifdef CONFIG_AUDITSYSCALL
170 E(PROC_TGID_LOGINUID, "loginuid", S_IFREG|S_IWUSR|S_IRUGO),
171 #endif
172 {0,0,NULL,0}
173 };
174 static struct pid_entry tid_base_stuff[] = {
175 E(PROC_TID_FD, "fd", S_IFDIR|S_IRUSR|S_IXUSR),
176 E(PROC_TID_ENVIRON, "environ", S_IFREG|S_IRUSR),
177 E(PROC_TID_AUXV, "auxv", S_IFREG|S_IRUSR),
178 E(PROC_TID_STATUS, "status", S_IFREG|S_IRUGO),
179 E(PROC_TID_CMDLINE, "cmdline", S_IFREG|S_IRUGO),
180 E(PROC_TID_STAT, "stat", S_IFREG|S_IRUGO),
181 E(PROC_TID_STATM, "statm", S_IFREG|S_IRUGO),
182 E(PROC_TID_MAPS, "maps", S_IFREG|S_IRUGO),
183 E(PROC_TID_MEM, "mem", S_IFREG|S_IRUSR|S_IWUSR),
184 #ifdef CONFIG_SECCOMP
185 E(PROC_TID_SECCOMP, "seccomp", S_IFREG|S_IRUSR|S_IWUSR),
186 #endif
187 E(PROC_TID_CWD, "cwd", S_IFLNK|S_IRWXUGO),
188 E(PROC_TID_ROOT, "root", S_IFLNK|S_IRWXUGO),
189 E(PROC_TID_EXE, "exe", S_IFLNK|S_IRWXUGO),
190 E(PROC_TID_MOUNTS, "mounts", S_IFREG|S_IRUGO),
191 #ifdef CONFIG_SECURITY
192 E(PROC_TID_ATTR, "attr", S_IFDIR|S_IRUGO|S_IXUGO),
193 #endif
194 #ifdef CONFIG_KALLSYMS
195 E(PROC_TID_WCHAN, "wchan", S_IFREG|S_IRUGO),
196 #endif
197 #ifdef CONFIG_SCHEDSTATS
198 E(PROC_TID_SCHEDSTAT, "schedstat",S_IFREG|S_IRUGO),
199 #endif
200 #ifdef CONFIG_CPUSETS
201 E(PROC_TID_CPUSET, "cpuset", S_IFREG|S_IRUGO),
202 #endif
203 E(PROC_TID_OOM_SCORE, "oom_score",S_IFREG|S_IRUGO),
204 E(PROC_TID_OOM_ADJUST, "oom_adj", S_IFREG|S_IRUGO|S_IWUSR),
205 #ifdef CONFIG_AUDITSYSCALL
206 E(PROC_TID_LOGINUID, "loginuid", S_IFREG|S_IWUSR|S_IRUGO),
207 #endif
208 {0,0,NULL,0}
209 };
210
211 #ifdef CONFIG_SECURITY
212 static struct pid_entry tgid_attr_stuff[] = {
213 E(PROC_TGID_ATTR_CURRENT, "current", S_IFREG|S_IRUGO|S_IWUGO),
214 E(PROC_TGID_ATTR_PREV, "prev", S_IFREG|S_IRUGO),
215 E(PROC_TGID_ATTR_EXEC, "exec", S_IFREG|S_IRUGO|S_IWUGO),
216 E(PROC_TGID_ATTR_FSCREATE, "fscreate", S_IFREG|S_IRUGO|S_IWUGO),
217 {0,0,NULL,0}
218 };
219 static struct pid_entry tid_attr_stuff[] = {
220 E(PROC_TID_ATTR_CURRENT, "current", S_IFREG|S_IRUGO|S_IWUGO),
221 E(PROC_TID_ATTR_PREV, "prev", S_IFREG|S_IRUGO),
222 E(PROC_TID_ATTR_EXEC, "exec", S_IFREG|S_IRUGO|S_IWUGO),
223 E(PROC_TID_ATTR_FSCREATE, "fscreate", S_IFREG|S_IRUGO|S_IWUGO),
224 {0,0,NULL,0}
225 };
226 #endif
227
228 #undef E
229
230 static int proc_fd_link(struct inode *inode, struct dentry **dentry, struct vfsmount **mnt)
231 {
232 struct task_struct *task = proc_task(inode);
233 struct files_struct *files;
234 struct file *file;
235 int fd = proc_type(inode) - PROC_TID_FD_DIR;
236
237 files = get_files_struct(task);
238 if (files) {
239 spin_lock(&files->file_lock);
240 file = fcheck_files(files, fd);
241 if (file) {
242 *mnt = mntget(file->f_vfsmnt);
243 *dentry = dget(file->f_dentry);
244 spin_unlock(&files->file_lock);
245 put_files_struct(files);
246 return 0;
247 }
248 spin_unlock(&files->file_lock);
249 put_files_struct(files);
250 }
251 return -ENOENT;
252 }
253
254 static int proc_cwd_link(struct inode *inode, struct dentry **dentry, struct vfsmount **mnt)
255 {
256 struct fs_struct *fs;
257 int result = -ENOENT;
258 task_lock(proc_task(inode));
259 fs = proc_task(inode)->fs;
260 if(fs)
261 atomic_inc(&fs->count);
262 task_unlock(proc_task(inode));
263 if (fs) {
264 read_lock(&fs->lock);
265 *mnt = mntget(fs->pwdmnt);
266 *dentry = dget(fs->pwd);
267 read_unlock(&fs->lock);
268 result = 0;
269 put_fs_struct(fs);
270 }
271 return result;
272 }
273
274 static int proc_root_link(struct inode *inode, struct dentry **dentry, struct vfsmount **mnt)
275 {
276 struct fs_struct *fs;
277 int result = -ENOENT;
278 task_lock(proc_task(inode));
279 fs = proc_task(inode)->fs;
280 if(fs)
281 atomic_inc(&fs->count);
282 task_unlock(proc_task(inode));
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
301 static int may_ptrace_attach(struct task_struct *task)
302 {
303 int retval = 0;
304
305 task_lock(task);
306
307 if (!task->mm)
308 goto out;
309 if (((current->uid != task->euid) ||
310 (current->uid != task->suid) ||
311 (current->uid != task->uid) ||
312 (current->gid != task->egid) ||
313 (current->gid != task->sgid) ||
314 (current->gid != task->gid)) && !capable(CAP_SYS_PTRACE))
315 goto out;
316 rmb();
317 if (task->mm->dumpable != 1 && !capable(CAP_SYS_PTRACE))
318 goto out;
319 if (security_ptrace(current, task))
320 goto out;
321
322 retval = 1;
323 out:
324 task_unlock(task);
325 return retval;
326 }
327
328 static int proc_pid_environ(struct task_struct *task, char * buffer)
329 {
330 int res = 0;
331 struct mm_struct *mm = get_task_mm(task);
332 if (mm) {
333 unsigned int len = mm->env_end - mm->env_start;
334 if (len > PAGE_SIZE)
335 len = PAGE_SIZE;
336 res = access_process_vm(task, mm->env_start, buffer, len, 0);
337 if (!may_ptrace_attach(task))
338 res = -ESRCH;
339 mmput(mm);
340 }
341 return res;
342 }
343
344 static int proc_pid_cmdline(struct task_struct *task, char * buffer)
345 {
346 int res = 0;
347 unsigned int len;
348 struct mm_struct *mm = get_task_mm(task);
349 if (!mm)
350 goto out;
351 if (!mm->arg_end)
352 goto out_mm; /* Shh! No looking before we're done */
353
354 len = mm->arg_end - mm->arg_start;
355
356 if (len > PAGE_SIZE)
357 len = PAGE_SIZE;
358
359 res = access_process_vm(task, mm->arg_start, buffer, len, 0);
360
361 // If the nul at the end of args has been overwritten, then
362 // assume application is using setproctitle(3).
363 if (res > 0 && buffer[res-1] != '\0' && len < PAGE_SIZE) {
364 len = strnlen(buffer, res);
365 if (len < res) {
366 res = len;
367 } else {
368 len = mm->env_end - mm->env_start;
369 if (len > PAGE_SIZE - res)
370 len = PAGE_SIZE - res;
371 res += access_process_vm(task, mm->env_start, buffer+res, len, 0);
372 res = strnlen(buffer, res);
373 }
374 }
375 out_mm:
376 mmput(mm);
377 out:
378 return res;
379 }
380
381 static int proc_pid_auxv(struct task_struct *task, char *buffer)
382 {
383 int res = 0;
384 struct mm_struct *mm = get_task_mm(task);
385 if (mm) {
386 unsigned int nwords = 0;
387 do
388 nwords += 2;
389 while (mm->saved_auxv[nwords - 2] != 0); /* AT_NULL */
390 res = nwords * sizeof(mm->saved_auxv[0]);
391 if (res > PAGE_SIZE)
392 res = PAGE_SIZE;
393 memcpy(buffer, mm->saved_auxv, res);
394 mmput(mm);
395 }
396 return res;
397 }
398
399
400 #ifdef CONFIG_KALLSYMS
401 /*
402 * Provides a wchan file via kallsyms in a proper one-value-per-file format.
403 * Returns the resolved symbol. If that fails, simply return the address.
404 */
405 static int proc_pid_wchan(struct task_struct *task, char *buffer)
406 {
407 char *modname;
408 const char *sym_name;
409 unsigned long wchan, size, offset;
410 char namebuf[KSYM_NAME_LEN+1];
411
412 wchan = get_wchan(task);
413
414 sym_name = kallsyms_lookup(wchan, &size, &offset, &modname, namebuf);
415 if (sym_name)
416 return sprintf(buffer, "%s", sym_name);
417 return sprintf(buffer, "%lu", wchan);
418 }
419 #endif /* CONFIG_KALLSYMS */
420
421 #ifdef CONFIG_SCHEDSTATS
422 /*
423 * Provides /proc/PID/schedstat
424 */
425 static int proc_pid_schedstat(struct task_struct *task, char *buffer)
426 {
427 return sprintf(buffer, "%lu %lu %lu\n",
428 task->sched_info.cpu_time,
429 task->sched_info.run_delay,
430 task->sched_info.pcnt);
431 }
432 #endif
433
434 /* The badness from the OOM killer */
435 unsigned long badness(struct task_struct *p, unsigned long uptime);
436 static int proc_oom_score(struct task_struct *task, char *buffer)
437 {
438 unsigned long points;
439 struct timespec uptime;
440
441 do_posix_clock_monotonic_gettime(&uptime);
442 points = badness(task, uptime.tv_sec);
443 return sprintf(buffer, "%lu\n", points);
444 }
445
446 /************************************************************************/
447 /* Here the fs part begins */
448 /************************************************************************/
449
450 /* permission checks */
451
452 static int proc_check_root(struct inode *inode)
453 {
454 struct dentry *de, *base, *root;
455 struct vfsmount *our_vfsmnt, *vfsmnt, *mnt;
456 int res = 0;
457
458 if (proc_root_link(inode, &root, &vfsmnt)) /* Ewww... */
459 return -ENOENT;
460 read_lock(&current->fs->lock);
461 our_vfsmnt = mntget(current->fs->rootmnt);
462 base = dget(current->fs->root);
463 read_unlock(&current->fs->lock);
464
465 spin_lock(&vfsmount_lock);
466 de = root;
467 mnt = vfsmnt;
468
469 while (vfsmnt != our_vfsmnt) {
470 if (vfsmnt == vfsmnt->mnt_parent)
471 goto out;
472 de = vfsmnt->mnt_mountpoint;
473 vfsmnt = vfsmnt->mnt_parent;
474 }
475
476 if (!is_subdir(de, base))
477 goto out;
478 spin_unlock(&vfsmount_lock);
479
480 exit:
481 dput(base);
482 mntput(our_vfsmnt);
483 dput(root);
484 mntput(mnt);
485 return res;
486 out:
487 spin_unlock(&vfsmount_lock);
488 res = -EACCES;
489 goto exit;
490 }
491
492 static int proc_permission(struct inode *inode, int mask, struct nameidata *nd)
493 {
494 if (generic_permission(inode, mask, NULL) != 0)
495 return -EACCES;
496 return proc_check_root(inode);
497 }
498
499 extern struct seq_operations proc_pid_maps_op;
500 static int maps_open(struct inode *inode, struct file *file)
501 {
502 struct task_struct *task = proc_task(inode);
503 int ret = seq_open(file, &proc_pid_maps_op);
504 if (!ret) {
505 struct seq_file *m = file->private_data;
506 m->private = task;
507 }
508 return ret;
509 }
510
511 static struct file_operations proc_maps_operations = {
512 .open = maps_open,
513 .read = seq_read,
514 .llseek = seq_lseek,
515 .release = seq_release,
516 };
517
518 extern struct seq_operations mounts_op;
519 static int mounts_open(struct inode *inode, struct file *file)
520 {
521 struct task_struct *task = proc_task(inode);
522 int ret = seq_open(file, &mounts_op);
523
524 if (!ret) {
525 struct seq_file *m = file->private_data;
526 struct namespace *namespace;
527 task_lock(task);
528 namespace = task->namespace;
529 if (namespace)
530 get_namespace(namespace);
531 task_unlock(task);
532
533 if (namespace)
534 m->private = namespace;
535 else {
536 seq_release(inode, file);
537 ret = -EINVAL;
538 }
539 }
540 return ret;
541 }
542
543 static int mounts_release(struct inode *inode, struct file *file)
544 {
545 struct seq_file *m = file->private_data;
546 struct namespace *namespace = m->private;
547 put_namespace(namespace);
548 return seq_release(inode, file);
549 }
550
551 static struct file_operations proc_mounts_operations = {
552 .open = mounts_open,
553 .read = seq_read,
554 .llseek = seq_lseek,
555 .release = mounts_release,
556 };
557
558 #define PROC_BLOCK_SIZE (3*1024) /* 4K page size but our output routines use some slack for overruns */
559
560 static ssize_t proc_info_read(struct file * file, char __user * buf,
561 size_t count, loff_t *ppos)
562 {
563 struct inode * inode = file->f_dentry->d_inode;
564 unsigned long page;
565 ssize_t length;
566 struct task_struct *task = proc_task(inode);
567
568 if (count > PROC_BLOCK_SIZE)
569 count = PROC_BLOCK_SIZE;
570 if (!(page = __get_free_page(GFP_KERNEL)))
571 return -ENOMEM;
572
573 length = PROC_I(inode)->op.proc_read(task, (char*)page);
574
575 if (length >= 0)
576 length = simple_read_from_buffer(buf, count, ppos, (char *)page, length);
577 free_page(page);
578 return length;
579 }
580
581 static struct file_operations proc_info_file_operations = {
582 .read = proc_info_read,
583 };
584
585 static int mem_open(struct inode* inode, struct file* file)
586 {
587 file->private_data = (void*)((long)current->self_exec_id);
588 return 0;
589 }
590
591 static ssize_t mem_read(struct file * file, char __user * buf,
592 size_t count, loff_t *ppos)
593 {
594 struct task_struct *task = proc_task(file->f_dentry->d_inode);
595 char *page;
596 unsigned long src = *ppos;
597 int ret = -ESRCH;
598 struct mm_struct *mm;
599
600 if (!MAY_PTRACE(task) || !may_ptrace_attach(task))
601 goto out;
602
603 ret = -ENOMEM;
604 page = (char *)__get_free_page(GFP_USER);
605 if (!page)
606 goto out;
607
608 ret = 0;
609
610 mm = get_task_mm(task);
611 if (!mm)
612 goto out_free;
613
614 ret = -EIO;
615
616 if (file->private_data != (void*)((long)current->self_exec_id))
617 goto out_put;
618
619 ret = 0;
620
621 while (count > 0) {
622 int this_len, retval;
623
624 this_len = (count > PAGE_SIZE) ? PAGE_SIZE : count;
625 retval = access_process_vm(task, src, page, this_len, 0);
626 if (!retval || !MAY_PTRACE(task) || !may_ptrace_attach(task)) {
627 if (!ret)
628 ret = -EIO;
629 break;
630 }
631
632 if (copy_to_user(buf, page, retval)) {
633 ret = -EFAULT;
634 break;
635 }
636
637 ret += retval;
638 src += retval;
639 buf += retval;
640 count -= retval;
641 }
642 *ppos = src;
643
644 out_put:
645 mmput(mm);
646 out_free:
647 free_page((unsigned long) page);
648 out:
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 {
659 int copied = 0;
660 char *page;
661 struct task_struct *task = proc_task(file->f_dentry->d_inode);
662 unsigned long dst = *ppos;
663
664 if (!MAY_PTRACE(task) || !may_ptrace_attach(task))
665 return -ESRCH;
666
667 page = (char *)__get_free_page(GFP_USER);
668 if (!page)
669 return -ENOMEM;
670
671 while (count > 0) {
672 int this_len, retval;
673
674 this_len = (count > PAGE_SIZE) ? PAGE_SIZE : count;
675 if (copy_from_user(page, buf, this_len)) {
676 copied = -EFAULT;
677 break;
678 }
679 retval = access_process_vm(task, dst, page, this_len, 1);
680 if (!retval) {
681 if (!copied)
682 copied = -EIO;
683 break;
684 }
685 copied += retval;
686 buf += retval;
687 dst += retval;
688 count -= retval;
689 }
690 *ppos = dst;
691 free_page((unsigned long) page);
692 return copied;
693 }
694 #endif
695
696 static loff_t mem_lseek(struct file * file, loff_t offset, int orig)
697 {
698 switch (orig) {
699 case 0:
700 file->f_pos = offset;
701 break;
702 case 1:
703 file->f_pos += offset;
704 break;
705 default:
706 return -EINVAL;
707 }
708 force_successful_syscall_return();
709 return file->f_pos;
710 }
711
712 static struct file_operations proc_mem_operations = {
713 .llseek = mem_lseek,
714 .read = mem_read,
715 .write = mem_write,
716 .open = mem_open,
717 };
718
719 static ssize_t oom_adjust_read(struct file *file, char __user *buf,
720 size_t count, loff_t *ppos)
721 {
722 struct task_struct *task = proc_task(file->f_dentry->d_inode);
723 char buffer[8];
724 size_t len;
725 int oom_adjust = task->oomkilladj;
726 loff_t __ppos = *ppos;
727
728 len = sprintf(buffer, "%i\n", oom_adjust);
729 if (__ppos >= len)
730 return 0;
731 if (count > len-__ppos)
732 count = len-__ppos;
733 if (copy_to_user(buf, buffer + __ppos, count))
734 return -EFAULT;
735 *ppos = __ppos + count;
736 return count;
737 }
738
739 static ssize_t oom_adjust_write(struct file *file, const char __user *buf,
740 size_t count, loff_t *ppos)
741 {
742 struct task_struct *task = proc_task(file->f_dentry->d_inode);
743 char buffer[8], *end;
744 int oom_adjust;
745
746 if (!capable(CAP_SYS_RESOURCE))
747 return -EPERM;
748 memset(buffer, 0, 8);
749 if (count > 6)
750 count = 6;
751 if (copy_from_user(buffer, buf, count))
752 return -EFAULT;
753 oom_adjust = simple_strtol(buffer, &end, 0);
754 if ((oom_adjust < -16 || oom_adjust > 15) && oom_adjust != OOM_DISABLE)
755 return -EINVAL;
756 if (*end == '\n')
757 end++;
758 task->oomkilladj = oom_adjust;
759 if (end - buffer == 0)
760 return -EIO;
761 return end - buffer;
762 }
763
764 static struct file_operations proc_oom_adjust_operations = {
765 .read = oom_adjust_read,
766 .write = oom_adjust_write,
767 };
768
769 static struct inode_operations proc_mem_inode_operations = {
770 .permission = proc_permission,
771 };
772
773 #ifdef CONFIG_AUDITSYSCALL
774 #define TMPBUFLEN 21
775 static ssize_t proc_loginuid_read(struct file * file, char __user * buf,
776 size_t count, loff_t *ppos)
777 {
778 struct inode * inode = file->f_dentry->d_inode;
779 struct task_struct *task = proc_task(inode);
780 ssize_t length;
781 char tmpbuf[TMPBUFLEN];
782
783 length = scnprintf(tmpbuf, TMPBUFLEN, "%u",
784 audit_get_loginuid(task->audit_context));
785 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
786 }
787
788 static ssize_t proc_loginuid_write(struct file * file, const char __user * buf,
789 size_t count, loff_t *ppos)
790 {
791 struct inode * inode = file->f_dentry->d_inode;
792 char *page, *tmp;
793 ssize_t length;
794 struct task_struct *task = proc_task(inode);
795 uid_t loginuid;
796
797 if (!capable(CAP_AUDIT_CONTROL))
798 return -EPERM;
799
800 if (current != task)
801 return -EPERM;
802
803 if (count > PAGE_SIZE)
804 count = PAGE_SIZE;
805
806 if (*ppos != 0) {
807 /* No partial writes. */
808 return -EINVAL;
809 }
810 page = (char*)__get_free_page(GFP_USER);
811 if (!page)
812 return -ENOMEM;
813 length = -EFAULT;
814 if (copy_from_user(page, buf, count))
815 goto out_free_page;
816
817 loginuid = simple_strtoul(page, &tmp, 10);
818 if (tmp == page) {
819 length = -EINVAL;
820 goto out_free_page;
821
822 }
823 length = audit_set_loginuid(task, loginuid);
824 if (likely(length == 0))
825 length = count;
826
827 out_free_page:
828 free_page((unsigned long) page);
829 return length;
830 }
831
832 static struct file_operations proc_loginuid_operations = {
833 .read = proc_loginuid_read,
834 .write = proc_loginuid_write,
835 };
836 #endif
837
838 #ifdef CONFIG_SECCOMP
839 static ssize_t seccomp_read(struct file *file, char __user *buf,
840 size_t count, loff_t *ppos)
841 {
842 struct task_struct *tsk = proc_task(file->f_dentry->d_inode);
843 char __buf[20];
844 loff_t __ppos = *ppos;
845 size_t len;
846
847 /* no need to print the trailing zero, so use only len */
848 len = sprintf(__buf, "%u\n", tsk->seccomp.mode);
849 if (__ppos >= len)
850 return 0;
851 if (count > len - __ppos)
852 count = len - __ppos;
853 if (copy_to_user(buf, __buf + __ppos, count))
854 return -EFAULT;
855 *ppos = __ppos + count;
856 return count;
857 }
858
859 static ssize_t seccomp_write(struct file *file, const char __user *buf,
860 size_t count, loff_t *ppos)
861 {
862 struct task_struct *tsk = proc_task(file->f_dentry->d_inode);
863 char __buf[20], *end;
864 unsigned int seccomp_mode;
865
866 /* can set it only once to be even more secure */
867 if (unlikely(tsk->seccomp.mode))
868 return -EPERM;
869
870 memset(__buf, 0, sizeof(__buf));
871 count = min(count, sizeof(__buf) - 1);
872 if (copy_from_user(__buf, buf, count))
873 return -EFAULT;
874 seccomp_mode = simple_strtoul(__buf, &end, 0);
875 if (*end == '\n')
876 end++;
877 if (seccomp_mode && seccomp_mode <= NR_SECCOMP_MODES) {
878 tsk->seccomp.mode = seccomp_mode;
879 set_tsk_thread_flag(tsk, TIF_SECCOMP);
880 } else
881 return -EINVAL;
882 if (unlikely(!(end - __buf)))
883 return -EIO;
884 return end - __buf;
885 }
886
887 static struct file_operations proc_seccomp_operations = {
888 .read = seccomp_read,
889 .write = seccomp_write,
890 };
891 #endif /* CONFIG_SECCOMP */
892
893 static int proc_pid_follow_link(struct dentry *dentry, struct nameidata *nd)
894 {
895 struct inode *inode = dentry->d_inode;
896 int error = -EACCES;
897
898 /* We don't need a base pointer in the /proc filesystem */
899 path_release(nd);
900
901 if (current->fsuid != inode->i_uid && !capable(CAP_DAC_OVERRIDE))
902 goto out;
903 error = proc_check_root(inode);
904 if (error)
905 goto out;
906
907 error = PROC_I(inode)->op.proc_get_link(inode, &nd->dentry, &nd->mnt);
908 nd->last_type = LAST_BIND;
909 out:
910 return error;
911 }
912
913 static int do_proc_readlink(struct dentry *dentry, struct vfsmount *mnt,
914 char __user *buffer, int buflen)
915 {
916 struct inode * inode;
917 char *tmp = (char*)__get_free_page(GFP_KERNEL), *path;
918 int len;
919
920 if (!tmp)
921 return -ENOMEM;
922
923 inode = dentry->d_inode;
924 path = d_path(dentry, mnt, tmp, PAGE_SIZE);
925 len = PTR_ERR(path);
926 if (IS_ERR(path))
927 goto out;
928 len = tmp + PAGE_SIZE - 1 - path;
929
930 if (len > buflen)
931 len = buflen;
932 if (copy_to_user(buffer, path, len))
933 len = -EFAULT;
934 out:
935 free_page((unsigned long)tmp);
936 return len;
937 }
938
939 static int proc_pid_readlink(struct dentry * dentry, char __user * buffer, int buflen)
940 {
941 int error = -EACCES;
942 struct inode *inode = dentry->d_inode;
943 struct dentry *de;
944 struct vfsmount *mnt = NULL;
945
946 lock_kernel();
947
948 if (current->fsuid != inode->i_uid && !capable(CAP_DAC_OVERRIDE))
949 goto out;
950 error = proc_check_root(inode);
951 if (error)
952 goto out;
953
954 error = PROC_I(inode)->op.proc_get_link(inode, &de, &mnt);
955 if (error)
956 goto out;
957
958 error = do_proc_readlink(de, mnt, buffer, buflen);
959 dput(de);
960 mntput(mnt);
961 out:
962 unlock_kernel();
963 return error;
964 }
965
966 static struct inode_operations proc_pid_link_inode_operations = {
967 .readlink = proc_pid_readlink,
968 .follow_link = proc_pid_follow_link
969 };
970
971 #define NUMBUF 10
972
973 static int proc_readfd(struct file * filp, void * dirent, filldir_t filldir)
974 {
975 struct inode *inode = filp->f_dentry->d_inode;
976 struct task_struct *p = proc_task(inode);
977 unsigned int fd, tid, ino;
978 int retval;
979 char buf[NUMBUF];
980 struct files_struct * files;
981
982 retval = -ENOENT;
983 if (!pid_alive(p))
984 goto out;
985 retval = 0;
986 tid = p->pid;
987
988 fd = filp->f_pos;
989 switch (fd) {
990 case 0:
991 if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0)
992 goto out;
993 filp->f_pos++;
994 case 1:
995 ino = fake_ino(tid, PROC_TID_INO);
996 if (filldir(dirent, "..", 2, 1, ino, DT_DIR) < 0)
997 goto out;
998 filp->f_pos++;
999 default:
1000 files = get_files_struct(p);
1001 if (!files)
1002 goto out;
1003 spin_lock(&files->file_lock);
1004 for (fd = filp->f_pos-2;
1005 fd < files->max_fds;
1006 fd++, filp->f_pos++) {
1007 unsigned int i,j;
1008
1009 if (!fcheck_files(files, fd))
1010 continue;
1011 spin_unlock(&files->file_lock);
1012
1013 j = NUMBUF;
1014 i = fd;
1015 do {
1016 j--;
1017 buf[j] = '0' + (i % 10);
1018 i /= 10;
1019 } while (i);
1020
1021 ino = fake_ino(tid, PROC_TID_FD_DIR + fd);
1022 if (filldir(dirent, buf+j, NUMBUF-j, fd+2, ino, DT_LNK) < 0) {
1023 spin_lock(&files->file_lock);
1024 break;
1025 }
1026 spin_lock(&files->file_lock);
1027 }
1028 spin_unlock(&files->file_lock);
1029 put_files_struct(files);
1030 }
1031 out:
1032 return retval;
1033 }
1034
1035 static int proc_pident_readdir(struct file *filp,
1036 void *dirent, filldir_t filldir,
1037 struct pid_entry *ents, unsigned int nents)
1038 {
1039 int i;
1040 int pid;
1041 struct dentry *dentry = filp->f_dentry;
1042 struct inode *inode = dentry->d_inode;
1043 struct pid_entry *p;
1044 ino_t ino;
1045 int ret;
1046
1047 ret = -ENOENT;
1048 if (!pid_alive(proc_task(inode)))
1049 goto out;
1050
1051 ret = 0;
1052 pid = proc_task(inode)->pid;
1053 i = filp->f_pos;
1054 switch (i) {
1055 case 0:
1056 ino = inode->i_ino;
1057 if (filldir(dirent, ".", 1, i, ino, DT_DIR) < 0)
1058 goto out;
1059 i++;
1060 filp->f_pos++;
1061 /* fall through */
1062 case 1:
1063 ino = parent_ino(dentry);
1064 if (filldir(dirent, "..", 2, i, ino, DT_DIR) < 0)
1065 goto out;
1066 i++;
1067 filp->f_pos++;
1068 /* fall through */
1069 default:
1070 i -= 2;
1071 if (i >= nents) {
1072 ret = 1;
1073 goto out;
1074 }
1075 p = ents + i;
1076 while (p->name) {
1077 if (filldir(dirent, p->name, p->len, filp->f_pos,
1078 fake_ino(pid, p->type), p->mode >> 12) < 0)
1079 goto out;
1080 filp->f_pos++;
1081 p++;
1082 }
1083 }
1084
1085 ret = 1;
1086 out:
1087 return ret;
1088 }
1089
1090 static int proc_tgid_base_readdir(struct file * filp,
1091 void * dirent, filldir_t filldir)
1092 {
1093 return proc_pident_readdir(filp,dirent,filldir,
1094 tgid_base_stuff,ARRAY_SIZE(tgid_base_stuff));
1095 }
1096
1097 static int proc_tid_base_readdir(struct file * filp,
1098 void * dirent, filldir_t filldir)
1099 {
1100 return proc_pident_readdir(filp,dirent,filldir,
1101 tid_base_stuff,ARRAY_SIZE(tid_base_stuff));
1102 }
1103
1104 /* building an inode */
1105
1106 static int task_dumpable(struct task_struct *task)
1107 {
1108 int dumpable = 0;
1109 struct mm_struct *mm;
1110
1111 task_lock(task);
1112 mm = task->mm;
1113 if (mm)
1114 dumpable = mm->dumpable;
1115 task_unlock(task);
1116 if(dumpable == 1)
1117 return 1;
1118 return 0;
1119 }
1120
1121
1122 static struct inode *proc_pid_make_inode(struct super_block * sb, struct task_struct *task, int ino)
1123 {
1124 struct inode * inode;
1125 struct proc_inode *ei;
1126
1127 /* We need a new inode */
1128
1129 inode = new_inode(sb);
1130 if (!inode)
1131 goto out;
1132
1133 /* Common stuff */
1134 ei = PROC_I(inode);
1135 ei->task = NULL;
1136 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
1137 inode->i_ino = fake_ino(task->pid, ino);
1138
1139 if (!pid_alive(task))
1140 goto out_unlock;
1141
1142 /*
1143 * grab the reference to task.
1144 */
1145 get_task_struct(task);
1146 ei->task = task;
1147 ei->type = ino;
1148 inode->i_uid = 0;
1149 inode->i_gid = 0;
1150 if (ino == PROC_TGID_INO || ino == PROC_TID_INO || task_dumpable(task)) {
1151 inode->i_uid = task->euid;
1152 inode->i_gid = task->egid;
1153 }
1154 security_task_to_inode(task, inode);
1155
1156 out:
1157 return inode;
1158
1159 out_unlock:
1160 ei->pde = NULL;
1161 iput(inode);
1162 return NULL;
1163 }
1164
1165 /* dentry stuff */
1166
1167 /*
1168 * Exceptional case: normally we are not allowed to unhash a busy
1169 * directory. In this case, however, we can do it - no aliasing problems
1170 * due to the way we treat inodes.
1171 *
1172 * Rewrite the inode's ownerships here because the owning task may have
1173 * performed a setuid(), etc.
1174 */
1175 static int pid_revalidate(struct dentry *dentry, struct nameidata *nd)
1176 {
1177 struct inode *inode = dentry->d_inode;
1178 struct task_struct *task = proc_task(inode);
1179 if (pid_alive(task)) {
1180 if (proc_type(inode) == PROC_TGID_INO || proc_type(inode) == PROC_TID_INO || task_dumpable(task)) {
1181 inode->i_uid = task->euid;
1182 inode->i_gid = task->egid;
1183 } else {
1184 inode->i_uid = 0;
1185 inode->i_gid = 0;
1186 }
1187 security_task_to_inode(task, inode);
1188 return 1;
1189 }
1190 d_drop(dentry);
1191 return 0;
1192 }
1193
1194 static int tid_fd_revalidate(struct dentry *dentry, struct nameidata *nd)
1195 {
1196 struct inode *inode = dentry->d_inode;
1197 struct task_struct *task = proc_task(inode);
1198 int fd = proc_type(inode) - PROC_TID_FD_DIR;
1199 struct files_struct *files;
1200
1201 files = get_files_struct(task);
1202 if (files) {
1203 spin_lock(&files->file_lock);
1204 if (fcheck_files(files, fd)) {
1205 spin_unlock(&files->file_lock);
1206 put_files_struct(files);
1207 if (task_dumpable(task)) {
1208 inode->i_uid = task->euid;
1209 inode->i_gid = task->egid;
1210 } else {
1211 inode->i_uid = 0;
1212 inode->i_gid = 0;
1213 }
1214 security_task_to_inode(task, inode);
1215 return 1;
1216 }
1217 spin_unlock(&files->file_lock);
1218 put_files_struct(files);
1219 }
1220 d_drop(dentry);
1221 return 0;
1222 }
1223
1224 static void pid_base_iput(struct dentry *dentry, struct inode *inode)
1225 {
1226 struct task_struct *task = proc_task(inode);
1227 spin_lock(&task->proc_lock);
1228 if (task->proc_dentry == dentry)
1229 task->proc_dentry = NULL;
1230 spin_unlock(&task->proc_lock);
1231 iput(inode);
1232 }
1233
1234 static int pid_delete_dentry(struct dentry * dentry)
1235 {
1236 /* Is the task we represent dead?
1237 * If so, then don't put the dentry on the lru list,
1238 * kill it immediately.
1239 */
1240 return !pid_alive(proc_task(dentry->d_inode));
1241 }
1242
1243 static struct dentry_operations tid_fd_dentry_operations =
1244 {
1245 .d_revalidate = tid_fd_revalidate,
1246 .d_delete = pid_delete_dentry,
1247 };
1248
1249 static struct dentry_operations pid_dentry_operations =
1250 {
1251 .d_revalidate = pid_revalidate,
1252 .d_delete = pid_delete_dentry,
1253 };
1254
1255 static struct dentry_operations pid_base_dentry_operations =
1256 {
1257 .d_revalidate = pid_revalidate,
1258 .d_iput = pid_base_iput,
1259 .d_delete = pid_delete_dentry,
1260 };
1261
1262 /* Lookups */
1263
1264 static unsigned name_to_int(struct dentry *dentry)
1265 {
1266 const char *name = dentry->d_name.name;
1267 int len = dentry->d_name.len;
1268 unsigned n = 0;
1269
1270 if (len > 1 && *name == '0')
1271 goto out;
1272 while (len-- > 0) {
1273 unsigned c = *name++ - '0';
1274 if (c > 9)
1275 goto out;
1276 if (n >= (~0U-9)/10)
1277 goto out;
1278 n *= 10;
1279 n += c;
1280 }
1281 return n;
1282 out:
1283 return ~0U;
1284 }
1285
1286 /* SMP-safe */
1287 static struct dentry *proc_lookupfd(struct inode * dir, struct dentry * dentry, struct nameidata *nd)
1288 {
1289 struct task_struct *task = proc_task(dir);
1290 unsigned fd = name_to_int(dentry);
1291 struct file * file;
1292 struct files_struct * files;
1293 struct inode *inode;
1294 struct proc_inode *ei;
1295
1296 if (fd == ~0U)
1297 goto out;
1298 if (!pid_alive(task))
1299 goto out;
1300
1301 inode = proc_pid_make_inode(dir->i_sb, task, PROC_TID_FD_DIR+fd);
1302 if (!inode)
1303 goto out;
1304 ei = PROC_I(inode);
1305 files = get_files_struct(task);
1306 if (!files)
1307 goto out_unlock;
1308 inode->i_mode = S_IFLNK;
1309 spin_lock(&files->file_lock);
1310 file = fcheck_files(files, fd);
1311 if (!file)
1312 goto out_unlock2;
1313 if (file->f_mode & 1)
1314 inode->i_mode |= S_IRUSR | S_IXUSR;
1315 if (file->f_mode & 2)
1316 inode->i_mode |= S_IWUSR | S_IXUSR;
1317 spin_unlock(&files->file_lock);
1318 put_files_struct(files);
1319 inode->i_op = &proc_pid_link_inode_operations;
1320 inode->i_size = 64;
1321 ei->op.proc_get_link = proc_fd_link;
1322 dentry->d_op = &tid_fd_dentry_operations;
1323 d_add(dentry, inode);
1324 return NULL;
1325
1326 out_unlock2:
1327 spin_unlock(&files->file_lock);
1328 put_files_struct(files);
1329 out_unlock:
1330 iput(inode);
1331 out:
1332 return ERR_PTR(-ENOENT);
1333 }
1334
1335 static int proc_task_readdir(struct file * filp, void * dirent, filldir_t filldir);
1336 static struct dentry *proc_task_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd);
1337
1338 static struct file_operations proc_fd_operations = {
1339 .read = generic_read_dir,
1340 .readdir = proc_readfd,
1341 };
1342
1343 static struct file_operations proc_task_operations = {
1344 .read = generic_read_dir,
1345 .readdir = proc_task_readdir,
1346 };
1347
1348 /*
1349 * proc directories can do almost nothing..
1350 */
1351 static struct inode_operations proc_fd_inode_operations = {
1352 .lookup = proc_lookupfd,
1353 .permission = proc_permission,
1354 };
1355
1356 static struct inode_operations proc_task_inode_operations = {
1357 .lookup = proc_task_lookup,
1358 .permission = proc_permission,
1359 };
1360
1361 #ifdef CONFIG_SECURITY
1362 static ssize_t proc_pid_attr_read(struct file * file, char __user * buf,
1363 size_t count, loff_t *ppos)
1364 {
1365 struct inode * inode = file->f_dentry->d_inode;
1366 unsigned long page;
1367 ssize_t length;
1368 struct task_struct *task = proc_task(inode);
1369
1370 if (count > PAGE_SIZE)
1371 count = PAGE_SIZE;
1372 if (!(page = __get_free_page(GFP_KERNEL)))
1373 return -ENOMEM;
1374
1375 length = security_getprocattr(task,
1376 (char*)file->f_dentry->d_name.name,
1377 (void*)page, count);
1378 if (length >= 0)
1379 length = simple_read_from_buffer(buf, count, ppos, (char *)page, length);
1380 free_page(page);
1381 return length;
1382 }
1383
1384 static ssize_t proc_pid_attr_write(struct file * file, const char __user * buf,
1385 size_t count, loff_t *ppos)
1386 {
1387 struct inode * inode = file->f_dentry->d_inode;
1388 char *page;
1389 ssize_t length;
1390 struct task_struct *task = proc_task(inode);
1391
1392 if (count > PAGE_SIZE)
1393 count = PAGE_SIZE;
1394 if (*ppos != 0) {
1395 /* No partial writes. */
1396 return -EINVAL;
1397 }
1398 page = (char*)__get_free_page(GFP_USER);
1399 if (!page)
1400 return -ENOMEM;
1401 length = -EFAULT;
1402 if (copy_from_user(page, buf, count))
1403 goto out;
1404
1405 length = security_setprocattr(task,
1406 (char*)file->f_dentry->d_name.name,
1407 (void*)page, count);
1408 out:
1409 free_page((unsigned long) page);
1410 return length;
1411 }
1412
1413 static struct file_operations proc_pid_attr_operations = {
1414 .read = proc_pid_attr_read,
1415 .write = proc_pid_attr_write,
1416 };
1417
1418 static struct file_operations proc_tid_attr_operations;
1419 static struct inode_operations proc_tid_attr_inode_operations;
1420 static struct file_operations proc_tgid_attr_operations;
1421 static struct inode_operations proc_tgid_attr_inode_operations;
1422 #endif
1423
1424 static int get_tid_list(int index, unsigned int *tids, struct inode *dir);
1425
1426 /* SMP-safe */
1427 static struct dentry *proc_pident_lookup(struct inode *dir,
1428 struct dentry *dentry,
1429 struct pid_entry *ents)
1430 {
1431 struct inode *inode;
1432 int error;
1433 struct task_struct *task = proc_task(dir);
1434 struct pid_entry *p;
1435 struct proc_inode *ei;
1436
1437 error = -ENOENT;
1438 inode = NULL;
1439
1440 if (!pid_alive(task))
1441 goto out;
1442
1443 for (p = ents; p->name; p++) {
1444 if (p->len != dentry->d_name.len)
1445 continue;
1446 if (!memcmp(dentry->d_name.name, p->name, p->len))
1447 break;
1448 }
1449 if (!p->name)
1450 goto out;
1451
1452 error = -EINVAL;
1453 inode = proc_pid_make_inode(dir->i_sb, task, p->type);
1454 if (!inode)
1455 goto out;
1456
1457 ei = PROC_I(inode);
1458 inode->i_mode = p->mode;
1459 /*
1460 * Yes, it does not scale. And it should not. Don't add
1461 * new entries into /proc/<tgid>/ without very good reasons.
1462 */
1463 switch(p->type) {
1464 case PROC_TGID_TASK:
1465 inode->i_nlink = 2 + get_tid_list(2, NULL, dir);
1466 inode->i_op = &proc_task_inode_operations;
1467 inode->i_fop = &proc_task_operations;
1468 break;
1469 case PROC_TID_FD:
1470 case PROC_TGID_FD:
1471 inode->i_nlink = 2;
1472 inode->i_op = &proc_fd_inode_operations;
1473 inode->i_fop = &proc_fd_operations;
1474 break;
1475 case PROC_TID_EXE:
1476 case PROC_TGID_EXE:
1477 inode->i_op = &proc_pid_link_inode_operations;
1478 ei->op.proc_get_link = proc_exe_link;
1479 break;
1480 case PROC_TID_CWD:
1481 case PROC_TGID_CWD:
1482 inode->i_op = &proc_pid_link_inode_operations;
1483 ei->op.proc_get_link = proc_cwd_link;
1484 break;
1485 case PROC_TID_ROOT:
1486 case PROC_TGID_ROOT:
1487 inode->i_op = &proc_pid_link_inode_operations;
1488 ei->op.proc_get_link = proc_root_link;
1489 break;
1490 case PROC_TID_ENVIRON:
1491 case PROC_TGID_ENVIRON:
1492 inode->i_fop = &proc_info_file_operations;
1493 ei->op.proc_read = proc_pid_environ;
1494 break;
1495 case PROC_TID_AUXV:
1496 case PROC_TGID_AUXV:
1497 inode->i_fop = &proc_info_file_operations;
1498 ei->op.proc_read = proc_pid_auxv;
1499 break;
1500 case PROC_TID_STATUS:
1501 case PROC_TGID_STATUS:
1502 inode->i_fop = &proc_info_file_operations;
1503 ei->op.proc_read = proc_pid_status;
1504 break;
1505 case PROC_TID_STAT:
1506 inode->i_fop = &proc_info_file_operations;
1507 ei->op.proc_read = proc_tid_stat;
1508 break;
1509 case PROC_TGID_STAT:
1510 inode->i_fop = &proc_info_file_operations;
1511 ei->op.proc_read = proc_tgid_stat;
1512 break;
1513 case PROC_TID_CMDLINE:
1514 case PROC_TGID_CMDLINE:
1515 inode->i_fop = &proc_info_file_operations;
1516 ei->op.proc_read = proc_pid_cmdline;
1517 break;
1518 case PROC_TID_STATM:
1519 case PROC_TGID_STATM:
1520 inode->i_fop = &proc_info_file_operations;
1521 ei->op.proc_read = proc_pid_statm;
1522 break;
1523 case PROC_TID_MAPS:
1524 case PROC_TGID_MAPS:
1525 inode->i_fop = &proc_maps_operations;
1526 break;
1527 case PROC_TID_MEM:
1528 case PROC_TGID_MEM:
1529 inode->i_op = &proc_mem_inode_operations;
1530 inode->i_fop = &proc_mem_operations;
1531 break;
1532 #ifdef CONFIG_SECCOMP
1533 case PROC_TID_SECCOMP:
1534 case PROC_TGID_SECCOMP:
1535 inode->i_fop = &proc_seccomp_operations;
1536 break;
1537 #endif /* CONFIG_SECCOMP */
1538 case PROC_TID_MOUNTS:
1539 case PROC_TGID_MOUNTS:
1540 inode->i_fop = &proc_mounts_operations;
1541 break;
1542 #ifdef CONFIG_SECURITY
1543 case PROC_TID_ATTR:
1544 inode->i_nlink = 2;
1545 inode->i_op = &proc_tid_attr_inode_operations;
1546 inode->i_fop = &proc_tid_attr_operations;
1547 break;
1548 case PROC_TGID_ATTR:
1549 inode->i_nlink = 2;
1550 inode->i_op = &proc_tgid_attr_inode_operations;
1551 inode->i_fop = &proc_tgid_attr_operations;
1552 break;
1553 case PROC_TID_ATTR_CURRENT:
1554 case PROC_TGID_ATTR_CURRENT:
1555 case PROC_TID_ATTR_PREV:
1556 case PROC_TGID_ATTR_PREV:
1557 case PROC_TID_ATTR_EXEC:
1558 case PROC_TGID_ATTR_EXEC:
1559 case PROC_TID_ATTR_FSCREATE:
1560 case PROC_TGID_ATTR_FSCREATE:
1561 inode->i_fop = &proc_pid_attr_operations;
1562 break;
1563 #endif
1564 #ifdef CONFIG_KALLSYMS
1565 case PROC_TID_WCHAN:
1566 case PROC_TGID_WCHAN:
1567 inode->i_fop = &proc_info_file_operations;
1568 ei->op.proc_read = proc_pid_wchan;
1569 break;
1570 #endif
1571 #ifdef CONFIG_SCHEDSTATS
1572 case PROC_TID_SCHEDSTAT:
1573 case PROC_TGID_SCHEDSTAT:
1574 inode->i_fop = &proc_info_file_operations;
1575 ei->op.proc_read = proc_pid_schedstat;
1576 break;
1577 #endif
1578 #ifdef CONFIG_CPUSETS
1579 case PROC_TID_CPUSET:
1580 case PROC_TGID_CPUSET:
1581 inode->i_fop = &proc_cpuset_operations;
1582 break;
1583 #endif
1584 case PROC_TID_OOM_SCORE:
1585 case PROC_TGID_OOM_SCORE:
1586 inode->i_fop = &proc_info_file_operations;
1587 ei->op.proc_read = proc_oom_score;
1588 break;
1589 case PROC_TID_OOM_ADJUST:
1590 case PROC_TGID_OOM_ADJUST:
1591 inode->i_fop = &proc_oom_adjust_operations;
1592 break;
1593 #ifdef CONFIG_AUDITSYSCALL
1594 case PROC_TID_LOGINUID:
1595 case PROC_TGID_LOGINUID:
1596 inode->i_fop = &proc_loginuid_operations;
1597 break;
1598 #endif
1599 default:
1600 printk("procfs: impossible type (%d)",p->type);
1601 iput(inode);
1602 return ERR_PTR(-EINVAL);
1603 }
1604 dentry->d_op = &pid_dentry_operations;
1605 d_add(dentry, inode);
1606 return NULL;
1607
1608 out:
1609 return ERR_PTR(error);
1610 }
1611
1612 static struct dentry *proc_tgid_base_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd){
1613 return proc_pident_lookup(dir, dentry, tgid_base_stuff);
1614 }
1615
1616 static struct dentry *proc_tid_base_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd){
1617 return proc_pident_lookup(dir, dentry, tid_base_stuff);
1618 }
1619
1620 static struct file_operations proc_tgid_base_operations = {
1621 .read = generic_read_dir,
1622 .readdir = proc_tgid_base_readdir,
1623 };
1624
1625 static struct file_operations proc_tid_base_operations = {
1626 .read = generic_read_dir,
1627 .readdir = proc_tid_base_readdir,
1628 };
1629
1630 static struct inode_operations proc_tgid_base_inode_operations = {
1631 .lookup = proc_tgid_base_lookup,
1632 };
1633
1634 static struct inode_operations proc_tid_base_inode_operations = {
1635 .lookup = proc_tid_base_lookup,
1636 };
1637
1638 #ifdef CONFIG_SECURITY
1639 static int proc_tgid_attr_readdir(struct file * filp,
1640 void * dirent, filldir_t filldir)
1641 {
1642 return proc_pident_readdir(filp,dirent,filldir,
1643 tgid_attr_stuff,ARRAY_SIZE(tgid_attr_stuff));
1644 }
1645
1646 static int proc_tid_attr_readdir(struct file * filp,
1647 void * dirent, filldir_t filldir)
1648 {
1649 return proc_pident_readdir(filp,dirent,filldir,
1650 tid_attr_stuff,ARRAY_SIZE(tid_attr_stuff));
1651 }
1652
1653 static struct file_operations proc_tgid_attr_operations = {
1654 .read = generic_read_dir,
1655 .readdir = proc_tgid_attr_readdir,
1656 };
1657
1658 static struct file_operations proc_tid_attr_operations = {
1659 .read = generic_read_dir,
1660 .readdir = proc_tid_attr_readdir,
1661 };
1662
1663 static struct dentry *proc_tgid_attr_lookup(struct inode *dir,
1664 struct dentry *dentry, struct nameidata *nd)
1665 {
1666 return proc_pident_lookup(dir, dentry, tgid_attr_stuff);
1667 }
1668
1669 static struct dentry *proc_tid_attr_lookup(struct inode *dir,
1670 struct dentry *dentry, struct nameidata *nd)
1671 {
1672 return proc_pident_lookup(dir, dentry, tid_attr_stuff);
1673 }
1674
1675 static struct inode_operations proc_tgid_attr_inode_operations = {
1676 .lookup = proc_tgid_attr_lookup,
1677 };
1678
1679 static struct inode_operations proc_tid_attr_inode_operations = {
1680 .lookup = proc_tid_attr_lookup,
1681 };
1682 #endif
1683
1684 /*
1685 * /proc/self:
1686 */
1687 static int proc_self_readlink(struct dentry *dentry, char __user *buffer,
1688 int buflen)
1689 {
1690 char tmp[30];
1691 sprintf(tmp, "%d", current->tgid);
1692 return vfs_readlink(dentry,buffer,buflen,tmp);
1693 }
1694
1695 static int proc_self_follow_link(struct dentry *dentry, struct nameidata *nd)
1696 {
1697 char tmp[30];
1698 sprintf(tmp, "%d", current->tgid);
1699 return vfs_follow_link(nd,tmp);
1700 }
1701
1702 static struct inode_operations proc_self_inode_operations = {
1703 .readlink = proc_self_readlink,
1704 .follow_link = proc_self_follow_link,
1705 };
1706
1707 /**
1708 * proc_pid_unhash - Unhash /proc/@pid entry from the dcache.
1709 * @p: task that should be flushed.
1710 *
1711 * Drops the /proc/@pid dcache entry from the hash chains.
1712 *
1713 * Dropping /proc/@pid entries and detach_pid must be synchroneous,
1714 * otherwise e.g. /proc/@pid/exe might point to the wrong executable,
1715 * if the pid value is immediately reused. This is enforced by
1716 * - caller must acquire spin_lock(p->proc_lock)
1717 * - must be called before detach_pid()
1718 * - proc_pid_lookup acquires proc_lock, and checks that
1719 * the target is not dead by looking at the attach count
1720 * of PIDTYPE_PID.
1721 */
1722
1723 struct dentry *proc_pid_unhash(struct task_struct *p)
1724 {
1725 struct dentry *proc_dentry;
1726
1727 proc_dentry = p->proc_dentry;
1728 if (proc_dentry != NULL) {
1729
1730 spin_lock(&dcache_lock);
1731 spin_lock(&proc_dentry->d_lock);
1732 if (!d_unhashed(proc_dentry)) {
1733 dget_locked(proc_dentry);
1734 __d_drop(proc_dentry);
1735 spin_unlock(&proc_dentry->d_lock);
1736 } else {
1737 spin_unlock(&proc_dentry->d_lock);
1738 proc_dentry = NULL;
1739 }
1740 spin_unlock(&dcache_lock);
1741 }
1742 return proc_dentry;
1743 }
1744
1745 /**
1746 * proc_pid_flush - recover memory used by stale /proc/@pid/x entries
1747 * @proc_dentry: directoy to prune.
1748 *
1749 * Shrink the /proc directory that was used by the just killed thread.
1750 */
1751
1752 void proc_pid_flush(struct dentry *proc_dentry)
1753 {
1754 might_sleep();
1755 if(proc_dentry != NULL) {
1756 shrink_dcache_parent(proc_dentry);
1757 dput(proc_dentry);
1758 }
1759 }
1760
1761 /* SMP-safe */
1762 struct dentry *proc_pid_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd)
1763 {
1764 struct task_struct *task;
1765 struct inode *inode;
1766 struct proc_inode *ei;
1767 unsigned tgid;
1768 int died;
1769
1770 if (dentry->d_name.len == 4 && !memcmp(dentry->d_name.name,"self",4)) {
1771 inode = new_inode(dir->i_sb);
1772 if (!inode)
1773 return ERR_PTR(-ENOMEM);
1774 ei = PROC_I(inode);
1775 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
1776 inode->i_ino = fake_ino(0, PROC_TGID_INO);
1777 ei->pde = NULL;
1778 inode->i_mode = S_IFLNK|S_IRWXUGO;
1779 inode->i_uid = inode->i_gid = 0;
1780 inode->i_size = 64;
1781 inode->i_op = &proc_self_inode_operations;
1782 d_add(dentry, inode);
1783 return NULL;
1784 }
1785 tgid = name_to_int(dentry);
1786 if (tgid == ~0U)
1787 goto out;
1788
1789 read_lock(&tasklist_lock);
1790 task = find_task_by_pid(tgid);
1791 if (task)
1792 get_task_struct(task);
1793 read_unlock(&tasklist_lock);
1794 if (!task)
1795 goto out;
1796
1797 inode = proc_pid_make_inode(dir->i_sb, task, PROC_TGID_INO);
1798
1799
1800 if (!inode) {
1801 put_task_struct(task);
1802 goto out;
1803 }
1804 inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO;
1805 inode->i_op = &proc_tgid_base_inode_operations;
1806 inode->i_fop = &proc_tgid_base_operations;
1807 inode->i_flags|=S_IMMUTABLE;
1808 #ifdef CONFIG_SECURITY
1809 inode->i_nlink = 5;
1810 #else
1811 inode->i_nlink = 4;
1812 #endif
1813
1814 dentry->d_op = &pid_base_dentry_operations;
1815
1816 died = 0;
1817 d_add(dentry, inode);
1818 spin_lock(&task->proc_lock);
1819 task->proc_dentry = dentry;
1820 if (!pid_alive(task)) {
1821 dentry = proc_pid_unhash(task);
1822 died = 1;
1823 }
1824 spin_unlock(&task->proc_lock);
1825
1826 put_task_struct(task);
1827 if (died) {
1828 proc_pid_flush(dentry);
1829 goto out;
1830 }
1831 return NULL;
1832 out:
1833 return ERR_PTR(-ENOENT);
1834 }
1835
1836 /* SMP-safe */
1837 static struct dentry *proc_task_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd)
1838 {
1839 struct task_struct *task;
1840 struct task_struct *leader = proc_task(dir);
1841 struct inode *inode;
1842 unsigned tid;
1843
1844 tid = name_to_int(dentry);
1845 if (tid == ~0U)
1846 goto out;
1847
1848 read_lock(&tasklist_lock);
1849 task = find_task_by_pid(tid);
1850 if (task)
1851 get_task_struct(task);
1852 read_unlock(&tasklist_lock);
1853 if (!task)
1854 goto out;
1855 if (leader->tgid != task->tgid)
1856 goto out_drop_task;
1857
1858 inode = proc_pid_make_inode(dir->i_sb, task, PROC_TID_INO);
1859
1860
1861 if (!inode)
1862 goto out_drop_task;
1863 inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO;
1864 inode->i_op = &proc_tid_base_inode_operations;
1865 inode->i_fop = &proc_tid_base_operations;
1866 inode->i_flags|=S_IMMUTABLE;
1867 #ifdef CONFIG_SECURITY
1868 inode->i_nlink = 4;
1869 #else
1870 inode->i_nlink = 3;
1871 #endif
1872
1873 dentry->d_op = &pid_base_dentry_operations;
1874
1875 d_add(dentry, inode);
1876
1877 put_task_struct(task);
1878 return NULL;
1879 out_drop_task:
1880 put_task_struct(task);
1881 out:
1882 return ERR_PTR(-ENOENT);
1883 }
1884
1885 #define PROC_NUMBUF 10
1886 #define PROC_MAXPIDS 20
1887
1888 /*
1889 * Get a few tgid's to return for filldir - we need to hold the
1890 * tasklist lock while doing this, and we must release it before
1891 * we actually do the filldir itself, so we use a temp buffer..
1892 */
1893 static int get_tgid_list(int index, unsigned long version, unsigned int *tgids)
1894 {
1895 struct task_struct *p;
1896 int nr_tgids = 0;
1897
1898 index--;
1899 read_lock(&tasklist_lock);
1900 p = NULL;
1901 if (version) {
1902 p = find_task_by_pid(version);
1903 if (p && !thread_group_leader(p))
1904 p = NULL;
1905 }
1906
1907 if (p)
1908 index = 0;
1909 else
1910 p = next_task(&init_task);
1911
1912 for ( ; p != &init_task; p = next_task(p)) {
1913 int tgid = p->pid;
1914 if (!pid_alive(p))
1915 continue;
1916 if (--index >= 0)
1917 continue;
1918 tgids[nr_tgids] = tgid;
1919 nr_tgids++;
1920 if (nr_tgids >= PROC_MAXPIDS)
1921 break;
1922 }
1923 read_unlock(&tasklist_lock);
1924 return nr_tgids;
1925 }
1926
1927 /*
1928 * Get a few tid's to return for filldir - we need to hold the
1929 * tasklist lock while doing this, and we must release it before
1930 * we actually do the filldir itself, so we use a temp buffer..
1931 */
1932 static int get_tid_list(int index, unsigned int *tids, struct inode *dir)
1933 {
1934 struct task_struct *leader_task = proc_task(dir);
1935 struct task_struct *task = leader_task;
1936 int nr_tids = 0;
1937
1938 index -= 2;
1939 read_lock(&tasklist_lock);
1940 /*
1941 * The starting point task (leader_task) might be an already
1942 * unlinked task, which cannot be used to access the task-list
1943 * via next_thread().
1944 */
1945 if (pid_alive(task)) do {
1946 int tid = task->pid;
1947
1948 if (--index >= 0)
1949 continue;
1950 if (tids != NULL)
1951 tids[nr_tids] = tid;
1952 nr_tids++;
1953 if (nr_tids >= PROC_MAXPIDS)
1954 break;
1955 } while ((task = next_thread(task)) != leader_task);
1956 read_unlock(&tasklist_lock);
1957 return nr_tids;
1958 }
1959
1960 /* for the /proc/ directory itself, after non-process stuff has been done */
1961 int proc_pid_readdir(struct file * filp, void * dirent, filldir_t filldir)
1962 {
1963 unsigned int tgid_array[PROC_MAXPIDS];
1964 char buf[PROC_NUMBUF];
1965 unsigned int nr = filp->f_pos - FIRST_PROCESS_ENTRY;
1966 unsigned int nr_tgids, i;
1967 int next_tgid;
1968
1969 if (!nr) {
1970 ino_t ino = fake_ino(0,PROC_TGID_INO);
1971 if (filldir(dirent, "self", 4, filp->f_pos, ino, DT_LNK) < 0)
1972 return 0;
1973 filp->f_pos++;
1974 nr++;
1975 }
1976
1977 /* f_version caches the tgid value that the last readdir call couldn't
1978 * return. lseek aka telldir automagically resets f_version to 0.
1979 */
1980 next_tgid = filp->f_version;
1981 filp->f_version = 0;
1982 for (;;) {
1983 nr_tgids = get_tgid_list(nr, next_tgid, tgid_array);
1984 if (!nr_tgids) {
1985 /* no more entries ! */
1986 break;
1987 }
1988 next_tgid = 0;
1989
1990 /* do not use the last found pid, reserve it for next_tgid */
1991 if (nr_tgids == PROC_MAXPIDS) {
1992 nr_tgids--;
1993 next_tgid = tgid_array[nr_tgids];
1994 }
1995
1996 for (i=0;i<nr_tgids;i++) {
1997 int tgid = tgid_array[i];
1998 ino_t ino = fake_ino(tgid,PROC_TGID_INO);
1999 unsigned long j = PROC_NUMBUF;
2000
2001 do
2002 buf[--j] = '0' + (tgid % 10);
2003 while ((tgid /= 10) != 0);
2004
2005 if (filldir(dirent, buf+j, PROC_NUMBUF-j, filp->f_pos, ino, DT_DIR) < 0) {
2006 /* returning this tgid failed, save it as the first
2007 * pid for the next readir call */
2008 filp->f_version = tgid_array[i];
2009 goto out;
2010 }
2011 filp->f_pos++;
2012 nr++;
2013 }
2014 }
2015 out:
2016 return 0;
2017 }
2018
2019 /* for the /proc/TGID/task/ directories */
2020 static int proc_task_readdir(struct file * filp, void * dirent, filldir_t filldir)
2021 {
2022 unsigned int tid_array[PROC_MAXPIDS];
2023 char buf[PROC_NUMBUF];
2024 unsigned int nr_tids, i;
2025 struct dentry *dentry = filp->f_dentry;
2026 struct inode *inode = dentry->d_inode;
2027 int retval = -ENOENT;
2028 ino_t ino;
2029 unsigned long pos = filp->f_pos; /* avoiding "long long" filp->f_pos */
2030
2031 if (!pid_alive(proc_task(inode)))
2032 goto out;
2033 retval = 0;
2034
2035 switch (pos) {
2036 case 0:
2037 ino = inode->i_ino;
2038 if (filldir(dirent, ".", 1, pos, ino, DT_DIR) < 0)
2039 goto out;
2040 pos++;
2041 /* fall through */
2042 case 1:
2043 ino = parent_ino(dentry);
2044 if (filldir(dirent, "..", 2, pos, ino, DT_DIR) < 0)
2045 goto out;
2046 pos++;
2047 /* fall through */
2048 }
2049
2050 nr_tids = get_tid_list(pos, tid_array, inode);
2051 inode->i_nlink = pos + nr_tids;
2052
2053 for (i = 0; i < nr_tids; i++) {
2054 unsigned long j = PROC_NUMBUF;
2055 int tid = tid_array[i];
2056
2057 ino = fake_ino(tid,PROC_TID_INO);
2058
2059 do
2060 buf[--j] = '0' + (tid % 10);
2061 while ((tid /= 10) != 0);
2062
2063 if (filldir(dirent, buf+j, PROC_NUMBUF-j, pos, ino, DT_DIR) < 0)
2064 break;
2065 pos++;
2066 }
2067 out:
2068 filp->f_pos = pos;
2069 return retval;
2070 }
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