4 * Copyright (C) 1991, 1992 Linus Torvalds
6 * proc base directory handling functions
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.
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>
24 * Embedded Linux Lab - 10LE Instituto Nokia de Tecnologia - INdT
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.
35 * Embedded Linux Lab - 10LE Instituto Nokia de Tecnologia - INdT
36 * Pud inclusion in the page table walking.
40 * 10LE Instituto Nokia de Tecnologia - INdT:
41 * A better way to walks through the page table as suggested by Hugh Dickins.
43 * Simo Piiroinen <simo.piiroinen@nokia.com>:
44 * Smaps information related to shared, private, clean and dirty pages.
46 * Paul Mundt <paul.mundt@nokia.com>:
47 * Overall revision about smaps.
50 #include <asm/uaccess.h>
52 #include <linux/config.h>
53 #include <linux/errno.h>
54 #include <linux/time.h>
55 #include <linux/proc_fs.h>
56 #include <linux/stat.h>
57 #include <linux/init.h>
58 #include <linux/capability.h>
59 #include <linux/file.h>
60 #include <linux/string.h>
61 #include <linux/seq_file.h>
62 #include <linux/namei.h>
63 #include <linux/namespace.h>
65 #include <linux/smp_lock.h>
66 #include <linux/rcupdate.h>
67 #include <linux/kallsyms.h>
68 #include <linux/mount.h>
69 #include <linux/security.h>
70 #include <linux/ptrace.h>
71 #include <linux/seccomp.h>
72 #include <linux/cpuset.h>
73 #include <linux/audit.h>
74 #include <linux/poll.h>
78 * Implementing inode permission operations in /proc is almost
79 * certainly an error. Permission checks need to happen during
80 * each system call not at open time. The reason is that most of
81 * what we wish to check for permissions in /proc varies at runtime.
83 * The classic example of a problem is opening file descriptors
84 * in /proc for a task before it execs a suid executable.
88 * For hysterical raisins we keep the same inumbers as in the old procfs.
89 * Feel free to change the macro below - just keep the range distinct from
90 * inumbers of the rest of procfs (currently those are in 0x0000--0xffff).
91 * As soon as we'll get a separate superblock we will be able to forget
92 * about magical ranges too.
95 #define fake_ino(pid,ino) (((pid)<<16)|(ino))
97 enum pid_directory_inos {
102 #ifdef CONFIG_SECCOMP
117 PROC_TGID_MOUNTSTATS,
122 #ifdef CONFIG_SCHEDSTATS
125 #ifdef CONFIG_CPUSETS
128 #ifdef CONFIG_SECURITY
130 PROC_TGID_ATTR_CURRENT,
133 PROC_TGID_ATTR_FSCREATE,
134 PROC_TGID_ATTR_KEYCREATE,
136 #ifdef CONFIG_AUDITSYSCALL
140 PROC_TGID_OOM_ADJUST,
144 #ifdef CONFIG_SECCOMP
164 #ifdef CONFIG_SCHEDSTATS
167 #ifdef CONFIG_CPUSETS
170 #ifdef CONFIG_SECURITY
172 PROC_TID_ATTR_CURRENT,
175 PROC_TID_ATTR_FSCREATE,
176 PROC_TID_ATTR_KEYCREATE,
178 #ifdef CONFIG_AUDITSYSCALL
184 /* Add new entries before this */
185 PROC_TID_FD_DIR = 0x8000, /* 0x8000-0xffff */
195 #define E(type,name,mode) {(type),sizeof(name)-1,(name),(mode)}
197 static struct pid_entry tgid_base_stuff[] = {
198 E(PROC_TGID_TASK, "task", S_IFDIR|S_IRUGO|S_IXUGO),
199 E(PROC_TGID_FD, "fd", S_IFDIR|S_IRUSR|S_IXUSR),
200 E(PROC_TGID_ENVIRON, "environ", S_IFREG|S_IRUSR),
201 E(PROC_TGID_AUXV, "auxv", S_IFREG|S_IRUSR),
202 E(PROC_TGID_STATUS, "status", S_IFREG|S_IRUGO),
203 E(PROC_TGID_CMDLINE, "cmdline", S_IFREG|S_IRUGO),
204 E(PROC_TGID_STAT, "stat", S_IFREG|S_IRUGO),
205 E(PROC_TGID_STATM, "statm", S_IFREG|S_IRUGO),
206 E(PROC_TGID_MAPS, "maps", S_IFREG|S_IRUGO),
208 E(PROC_TGID_NUMA_MAPS, "numa_maps", S_IFREG|S_IRUGO),
210 E(PROC_TGID_MEM, "mem", S_IFREG|S_IRUSR|S_IWUSR),
211 #ifdef CONFIG_SECCOMP
212 E(PROC_TGID_SECCOMP, "seccomp", S_IFREG|S_IRUSR|S_IWUSR),
214 E(PROC_TGID_CWD, "cwd", S_IFLNK|S_IRWXUGO),
215 E(PROC_TGID_ROOT, "root", S_IFLNK|S_IRWXUGO),
216 E(PROC_TGID_EXE, "exe", S_IFLNK|S_IRWXUGO),
217 E(PROC_TGID_MOUNTS, "mounts", S_IFREG|S_IRUGO),
218 E(PROC_TGID_MOUNTSTATS, "mountstats", S_IFREG|S_IRUSR),
220 E(PROC_TGID_SMAPS, "smaps", S_IFREG|S_IRUGO),
222 #ifdef CONFIG_SECURITY
223 E(PROC_TGID_ATTR, "attr", S_IFDIR|S_IRUGO|S_IXUGO),
225 #ifdef CONFIG_KALLSYMS
226 E(PROC_TGID_WCHAN, "wchan", S_IFREG|S_IRUGO),
228 #ifdef CONFIG_SCHEDSTATS
229 E(PROC_TGID_SCHEDSTAT, "schedstat", S_IFREG|S_IRUGO),
231 #ifdef CONFIG_CPUSETS
232 E(PROC_TGID_CPUSET, "cpuset", S_IFREG|S_IRUGO),
234 E(PROC_TGID_OOM_SCORE, "oom_score",S_IFREG|S_IRUGO),
235 E(PROC_TGID_OOM_ADJUST,"oom_adj", S_IFREG|S_IRUGO|S_IWUSR),
236 #ifdef CONFIG_AUDITSYSCALL
237 E(PROC_TGID_LOGINUID, "loginuid", S_IFREG|S_IWUSR|S_IRUGO),
241 static struct pid_entry tid_base_stuff[] = {
242 E(PROC_TID_FD, "fd", S_IFDIR|S_IRUSR|S_IXUSR),
243 E(PROC_TID_ENVIRON, "environ", S_IFREG|S_IRUSR),
244 E(PROC_TID_AUXV, "auxv", S_IFREG|S_IRUSR),
245 E(PROC_TID_STATUS, "status", S_IFREG|S_IRUGO),
246 E(PROC_TID_CMDLINE, "cmdline", S_IFREG|S_IRUGO),
247 E(PROC_TID_STAT, "stat", S_IFREG|S_IRUGO),
248 E(PROC_TID_STATM, "statm", S_IFREG|S_IRUGO),
249 E(PROC_TID_MAPS, "maps", S_IFREG|S_IRUGO),
251 E(PROC_TID_NUMA_MAPS, "numa_maps", S_IFREG|S_IRUGO),
253 E(PROC_TID_MEM, "mem", S_IFREG|S_IRUSR|S_IWUSR),
254 #ifdef CONFIG_SECCOMP
255 E(PROC_TID_SECCOMP, "seccomp", S_IFREG|S_IRUSR|S_IWUSR),
257 E(PROC_TID_CWD, "cwd", S_IFLNK|S_IRWXUGO),
258 E(PROC_TID_ROOT, "root", S_IFLNK|S_IRWXUGO),
259 E(PROC_TID_EXE, "exe", S_IFLNK|S_IRWXUGO),
260 E(PROC_TID_MOUNTS, "mounts", S_IFREG|S_IRUGO),
262 E(PROC_TID_SMAPS, "smaps", S_IFREG|S_IRUGO),
264 #ifdef CONFIG_SECURITY
265 E(PROC_TID_ATTR, "attr", S_IFDIR|S_IRUGO|S_IXUGO),
267 #ifdef CONFIG_KALLSYMS
268 E(PROC_TID_WCHAN, "wchan", S_IFREG|S_IRUGO),
270 #ifdef CONFIG_SCHEDSTATS
271 E(PROC_TID_SCHEDSTAT, "schedstat",S_IFREG|S_IRUGO),
273 #ifdef CONFIG_CPUSETS
274 E(PROC_TID_CPUSET, "cpuset", S_IFREG|S_IRUGO),
276 E(PROC_TID_OOM_SCORE, "oom_score",S_IFREG|S_IRUGO),
277 E(PROC_TID_OOM_ADJUST, "oom_adj", S_IFREG|S_IRUGO|S_IWUSR),
278 #ifdef CONFIG_AUDITSYSCALL
279 E(PROC_TID_LOGINUID, "loginuid", S_IFREG|S_IWUSR|S_IRUGO),
284 #ifdef CONFIG_SECURITY
285 static struct pid_entry tgid_attr_stuff[] = {
286 E(PROC_TGID_ATTR_CURRENT, "current", S_IFREG|S_IRUGO|S_IWUGO),
287 E(PROC_TGID_ATTR_PREV, "prev", S_IFREG|S_IRUGO),
288 E(PROC_TGID_ATTR_EXEC, "exec", S_IFREG|S_IRUGO|S_IWUGO),
289 E(PROC_TGID_ATTR_FSCREATE, "fscreate", S_IFREG|S_IRUGO|S_IWUGO),
290 E(PROC_TGID_ATTR_KEYCREATE, "keycreate", S_IFREG|S_IRUGO|S_IWUGO),
293 static struct pid_entry tid_attr_stuff[] = {
294 E(PROC_TID_ATTR_CURRENT, "current", S_IFREG|S_IRUGO|S_IWUGO),
295 E(PROC_TID_ATTR_PREV, "prev", S_IFREG|S_IRUGO),
296 E(PROC_TID_ATTR_EXEC, "exec", S_IFREG|S_IRUGO|S_IWUGO),
297 E(PROC_TID_ATTR_FSCREATE, "fscreate", S_IFREG|S_IRUGO|S_IWUGO),
298 E(PROC_TID_ATTR_KEYCREATE, "keycreate", S_IFREG|S_IRUGO|S_IWUGO),
305 static int proc_fd_link(struct inode *inode, struct dentry **dentry, struct vfsmount **mnt)
307 struct task_struct *task = proc_task(inode);
308 struct files_struct *files;
310 int fd = proc_fd(inode);
312 files = get_files_struct(task);
315 * We are not taking a ref to the file structure, so we must
318 spin_lock(&files->file_lock);
319 file = fcheck_files(files, fd);
321 *mnt = mntget(file->f_vfsmnt);
322 *dentry = dget(file->f_dentry);
323 spin_unlock(&files->file_lock);
324 put_files_struct(files);
327 spin_unlock(&files->file_lock);
328 put_files_struct(files);
333 static struct fs_struct *get_fs_struct(struct task_struct *task)
335 struct fs_struct *fs;
339 atomic_inc(&fs->count);
344 static int proc_cwd_link(struct inode *inode, struct dentry **dentry, struct vfsmount **mnt)
346 struct fs_struct *fs = get_fs_struct(proc_task(inode));
347 int result = -ENOENT;
349 read_lock(&fs->lock);
350 *mnt = mntget(fs->pwdmnt);
351 *dentry = dget(fs->pwd);
352 read_unlock(&fs->lock);
359 static int proc_root_link(struct inode *inode, struct dentry **dentry, struct vfsmount **mnt)
361 struct fs_struct *fs = get_fs_struct(proc_task(inode));
362 int result = -ENOENT;
364 read_lock(&fs->lock);
365 *mnt = mntget(fs->rootmnt);
366 *dentry = dget(fs->root);
367 read_unlock(&fs->lock);
374 #define MAY_PTRACE(task) \
375 (task == current || \
376 (task->parent == current && \
377 (task->ptrace & PT_PTRACED) && \
378 (task->state == TASK_STOPPED || task->state == TASK_TRACED) && \
379 security_ptrace(current,task) == 0))
381 static int proc_pid_environ(struct task_struct *task, char * buffer)
384 struct mm_struct *mm = get_task_mm(task);
386 unsigned int len = mm->env_end - mm->env_start;
389 res = access_process_vm(task, mm->env_start, buffer, len, 0);
390 if (!ptrace_may_attach(task))
397 static int proc_pid_cmdline(struct task_struct *task, char * buffer)
401 struct mm_struct *mm = get_task_mm(task);
405 goto out_mm; /* Shh! No looking before we're done */
407 len = mm->arg_end - mm->arg_start;
412 res = access_process_vm(task, mm->arg_start, buffer, len, 0);
414 // If the nul at the end of args has been overwritten, then
415 // assume application is using setproctitle(3).
416 if (res > 0 && buffer[res-1] != '\0' && len < PAGE_SIZE) {
417 len = strnlen(buffer, res);
421 len = mm->env_end - mm->env_start;
422 if (len > PAGE_SIZE - res)
423 len = PAGE_SIZE - res;
424 res += access_process_vm(task, mm->env_start, buffer+res, len, 0);
425 res = strnlen(buffer, res);
434 static int proc_pid_auxv(struct task_struct *task, char *buffer)
437 struct mm_struct *mm = get_task_mm(task);
439 unsigned int nwords = 0;
442 while (mm->saved_auxv[nwords - 2] != 0); /* AT_NULL */
443 res = nwords * sizeof(mm->saved_auxv[0]);
446 memcpy(buffer, mm->saved_auxv, res);
453 #ifdef CONFIG_KALLSYMS
455 * Provides a wchan file via kallsyms in a proper one-value-per-file format.
456 * Returns the resolved symbol. If that fails, simply return the address.
458 static int proc_pid_wchan(struct task_struct *task, char *buffer)
461 const char *sym_name;
462 unsigned long wchan, size, offset;
463 char namebuf[KSYM_NAME_LEN+1];
465 wchan = get_wchan(task);
467 sym_name = kallsyms_lookup(wchan, &size, &offset, &modname, namebuf);
469 return sprintf(buffer, "%s", sym_name);
470 return sprintf(buffer, "%lu", wchan);
472 #endif /* CONFIG_KALLSYMS */
474 #ifdef CONFIG_SCHEDSTATS
476 * Provides /proc/PID/schedstat
478 static int proc_pid_schedstat(struct task_struct *task, char *buffer)
480 return sprintf(buffer, "%lu %lu %lu\n",
481 task->sched_info.cpu_time,
482 task->sched_info.run_delay,
483 task->sched_info.pcnt);
487 /* The badness from the OOM killer */
488 unsigned long badness(struct task_struct *p, unsigned long uptime);
489 static int proc_oom_score(struct task_struct *task, char *buffer)
491 unsigned long points;
492 struct timespec uptime;
494 do_posix_clock_monotonic_gettime(&uptime);
495 points = badness(task, uptime.tv_sec);
496 return sprintf(buffer, "%lu\n", points);
499 /************************************************************************/
500 /* Here the fs part begins */
501 /************************************************************************/
503 /* permission checks */
505 /* If the process being read is separated by chroot from the reading process,
506 * don't let the reader access the threads.
508 static int proc_check_chroot(struct dentry *de, struct vfsmount *mnt)
511 struct vfsmount *our_vfsmnt;
514 read_lock(¤t->fs->lock);
515 our_vfsmnt = mntget(current->fs->rootmnt);
516 base = dget(current->fs->root);
517 read_unlock(¤t->fs->lock);
519 spin_lock(&vfsmount_lock);
521 while (mnt != our_vfsmnt) {
522 if (mnt == mnt->mnt_parent)
524 de = mnt->mnt_mountpoint;
525 mnt = mnt->mnt_parent;
528 if (!is_subdir(de, base))
530 spin_unlock(&vfsmount_lock);
537 spin_unlock(&vfsmount_lock);
542 extern struct seq_operations mounts_op;
548 static int mounts_open(struct inode *inode, struct file *file)
550 struct task_struct *task = proc_task(inode);
551 struct namespace *namespace;
552 struct proc_mounts *p;
556 namespace = task->namespace;
558 get_namespace(namespace);
563 p = kmalloc(sizeof(struct proc_mounts), GFP_KERNEL);
565 file->private_data = &p->m;
566 ret = seq_open(file, &mounts_op);
568 p->m.private = namespace;
569 p->event = namespace->event;
574 put_namespace(namespace);
579 static int mounts_release(struct inode *inode, struct file *file)
581 struct seq_file *m = file->private_data;
582 struct namespace *namespace = m->private;
583 put_namespace(namespace);
584 return seq_release(inode, file);
587 static unsigned mounts_poll(struct file *file, poll_table *wait)
589 struct proc_mounts *p = file->private_data;
590 struct namespace *ns = p->m.private;
593 poll_wait(file, &ns->poll, wait);
595 spin_lock(&vfsmount_lock);
596 if (p->event != ns->event) {
597 p->event = ns->event;
600 spin_unlock(&vfsmount_lock);
605 static struct file_operations proc_mounts_operations = {
609 .release = mounts_release,
613 extern struct seq_operations mountstats_op;
614 static int mountstats_open(struct inode *inode, struct file *file)
616 struct task_struct *task = proc_task(inode);
617 int ret = seq_open(file, &mountstats_op);
620 struct seq_file *m = file->private_data;
621 struct namespace *namespace;
623 namespace = task->namespace;
625 get_namespace(namespace);
629 m->private = namespace;
631 seq_release(inode, file);
638 static struct file_operations proc_mountstats_operations = {
639 .open = mountstats_open,
642 .release = mounts_release,
645 #define PROC_BLOCK_SIZE (3*1024) /* 4K page size but our output routines use some slack for overruns */
647 static ssize_t proc_info_read(struct file * file, char __user * buf,
648 size_t count, loff_t *ppos)
650 struct inode * inode = file->f_dentry->d_inode;
653 struct task_struct *task = proc_task(inode);
655 if (count > PROC_BLOCK_SIZE)
656 count = PROC_BLOCK_SIZE;
657 if (!(page = __get_free_page(GFP_KERNEL)))
660 length = PROC_I(inode)->op.proc_read(task, (char*)page);
663 length = simple_read_from_buffer(buf, count, ppos, (char *)page, length);
668 static struct file_operations proc_info_file_operations = {
669 .read = proc_info_read,
672 static int mem_open(struct inode* inode, struct file* file)
674 file->private_data = (void*)((long)current->self_exec_id);
678 static ssize_t mem_read(struct file * file, char __user * buf,
679 size_t count, loff_t *ppos)
681 struct task_struct *task = proc_task(file->f_dentry->d_inode);
683 unsigned long src = *ppos;
685 struct mm_struct *mm;
687 if (!MAY_PTRACE(task) || !ptrace_may_attach(task))
691 page = (char *)__get_free_page(GFP_USER);
697 mm = get_task_mm(task);
703 if (file->private_data != (void*)((long)current->self_exec_id))
709 int this_len, retval;
711 this_len = (count > PAGE_SIZE) ? PAGE_SIZE : count;
712 retval = access_process_vm(task, src, page, this_len, 0);
713 if (!retval || !MAY_PTRACE(task) || !ptrace_may_attach(task)) {
719 if (copy_to_user(buf, page, retval)) {
734 free_page((unsigned long) page);
739 #define mem_write NULL
742 /* This is a security hazard */
743 static ssize_t mem_write(struct file * file, const char * buf,
744 size_t count, loff_t *ppos)
748 struct task_struct *task = proc_task(file->f_dentry->d_inode);
749 unsigned long dst = *ppos;
751 if (!MAY_PTRACE(task) || !ptrace_may_attach(task))
754 page = (char *)__get_free_page(GFP_USER);
759 int this_len, retval;
761 this_len = (count > PAGE_SIZE) ? PAGE_SIZE : count;
762 if (copy_from_user(page, buf, this_len)) {
766 retval = access_process_vm(task, dst, page, this_len, 1);
778 free_page((unsigned long) page);
783 static loff_t mem_lseek(struct file * file, loff_t offset, int orig)
787 file->f_pos = offset;
790 file->f_pos += offset;
795 force_successful_syscall_return();
799 static struct file_operations proc_mem_operations = {
806 static ssize_t oom_adjust_read(struct file *file, char __user *buf,
807 size_t count, loff_t *ppos)
809 struct task_struct *task = proc_task(file->f_dentry->d_inode);
812 int oom_adjust = task->oomkilladj;
813 loff_t __ppos = *ppos;
815 len = sprintf(buffer, "%i\n", oom_adjust);
818 if (count > len-__ppos)
820 if (copy_to_user(buf, buffer + __ppos, count))
822 *ppos = __ppos + count;
826 static ssize_t oom_adjust_write(struct file *file, const char __user *buf,
827 size_t count, loff_t *ppos)
829 struct task_struct *task = proc_task(file->f_dentry->d_inode);
830 char buffer[8], *end;
833 if (!capable(CAP_SYS_RESOURCE))
835 memset(buffer, 0, 8);
838 if (copy_from_user(buffer, buf, count))
840 oom_adjust = simple_strtol(buffer, &end, 0);
841 if ((oom_adjust < -16 || oom_adjust > 15) && oom_adjust != OOM_DISABLE)
845 task->oomkilladj = oom_adjust;
846 if (end - buffer == 0)
851 static struct file_operations proc_oom_adjust_operations = {
852 .read = oom_adjust_read,
853 .write = oom_adjust_write,
856 #ifdef CONFIG_AUDITSYSCALL
858 static ssize_t proc_loginuid_read(struct file * file, char __user * buf,
859 size_t count, loff_t *ppos)
861 struct inode * inode = file->f_dentry->d_inode;
862 struct task_struct *task = proc_task(inode);
864 char tmpbuf[TMPBUFLEN];
866 length = scnprintf(tmpbuf, TMPBUFLEN, "%u",
867 audit_get_loginuid(task->audit_context));
868 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
871 static ssize_t proc_loginuid_write(struct file * file, const char __user * buf,
872 size_t count, loff_t *ppos)
874 struct inode * inode = file->f_dentry->d_inode;
877 struct task_struct *task = proc_task(inode);
880 if (!capable(CAP_AUDIT_CONTROL))
886 if (count >= PAGE_SIZE)
887 count = PAGE_SIZE - 1;
890 /* No partial writes. */
893 page = (char*)__get_free_page(GFP_USER);
897 if (copy_from_user(page, buf, count))
901 loginuid = simple_strtoul(page, &tmp, 10);
907 length = audit_set_loginuid(task, loginuid);
908 if (likely(length == 0))
912 free_page((unsigned long) page);
916 static struct file_operations proc_loginuid_operations = {
917 .read = proc_loginuid_read,
918 .write = proc_loginuid_write,
922 #ifdef CONFIG_SECCOMP
923 static ssize_t seccomp_read(struct file *file, char __user *buf,
924 size_t count, loff_t *ppos)
926 struct task_struct *tsk = proc_task(file->f_dentry->d_inode);
928 loff_t __ppos = *ppos;
931 /* no need to print the trailing zero, so use only len */
932 len = sprintf(__buf, "%u\n", tsk->seccomp.mode);
935 if (count > len - __ppos)
936 count = len - __ppos;
937 if (copy_to_user(buf, __buf + __ppos, count))
939 *ppos = __ppos + count;
943 static ssize_t seccomp_write(struct file *file, const char __user *buf,
944 size_t count, loff_t *ppos)
946 struct task_struct *tsk = proc_task(file->f_dentry->d_inode);
947 char __buf[20], *end;
948 unsigned int seccomp_mode;
950 /* can set it only once to be even more secure */
951 if (unlikely(tsk->seccomp.mode))
954 memset(__buf, 0, sizeof(__buf));
955 count = min(count, sizeof(__buf) - 1);
956 if (copy_from_user(__buf, buf, count))
958 seccomp_mode = simple_strtoul(__buf, &end, 0);
961 if (seccomp_mode && seccomp_mode <= NR_SECCOMP_MODES) {
962 tsk->seccomp.mode = seccomp_mode;
963 set_tsk_thread_flag(tsk, TIF_SECCOMP);
966 if (unlikely(!(end - __buf)))
971 static struct file_operations proc_seccomp_operations = {
972 .read = seccomp_read,
973 .write = seccomp_write,
975 #endif /* CONFIG_SECCOMP */
977 static int proc_check_dentry_visible(struct inode *inode,
978 struct dentry *dentry, struct vfsmount *mnt)
980 /* Verify that the current process can already see the
981 * file pointed at by the file descriptor.
982 * This prevents /proc from being an accidental information leak.
984 * This prevents access to files that are not visible do to
985 * being on the otherside of a chroot, in a different
986 * namespace, or are simply process local (like pipes).
988 struct task_struct *task;
989 struct files_struct *task_files, *files;
992 /* See if the the two tasks share a commone set of
993 * file descriptors. If so everything is visible.
995 task = proc_task(inode);
998 files = get_files_struct(current);
999 task_files = get_files_struct(task);
1000 if (files && task_files && (files == task_files))
1003 put_files_struct(task_files);
1005 put_files_struct(files);
1009 /* If the two tasks don't share a common set of file
1010 * descriptors see if the destination dentry is already
1011 * visible in the current tasks filesystem namespace.
1013 error = proc_check_chroot(dentry, mnt);
1019 static void *proc_pid_follow_link(struct dentry *dentry, struct nameidata *nd)
1021 struct inode *inode = dentry->d_inode;
1022 int error = -EACCES;
1024 /* We don't need a base pointer in the /proc filesystem */
1027 if (current->fsuid != inode->i_uid && !capable(CAP_DAC_OVERRIDE))
1030 error = PROC_I(inode)->op.proc_get_link(inode, &nd->dentry, &nd->mnt);
1031 nd->last_type = LAST_BIND;
1035 /* Only return files this task can already see */
1036 error = proc_check_dentry_visible(inode, nd->dentry, nd->mnt);
1040 return ERR_PTR(error);
1043 static int do_proc_readlink(struct dentry *dentry, struct vfsmount *mnt,
1044 char __user *buffer, int buflen)
1046 struct inode * inode;
1047 char *tmp = (char*)__get_free_page(GFP_KERNEL), *path;
1053 inode = dentry->d_inode;
1054 path = d_path(dentry, mnt, tmp, PAGE_SIZE);
1055 len = PTR_ERR(path);
1058 len = tmp + PAGE_SIZE - 1 - path;
1062 if (copy_to_user(buffer, path, len))
1065 free_page((unsigned long)tmp);
1069 static int proc_pid_readlink(struct dentry * dentry, char __user * buffer, int buflen)
1071 int error = -EACCES;
1072 struct inode *inode = dentry->d_inode;
1074 struct vfsmount *mnt = NULL;
1077 if (current->fsuid != inode->i_uid && !capable(CAP_DAC_OVERRIDE))
1080 error = PROC_I(inode)->op.proc_get_link(inode, &de, &mnt);
1084 /* Only return files this task can already see */
1085 error = proc_check_dentry_visible(inode, de, mnt);
1089 error = do_proc_readlink(de, mnt, buffer, buflen);
1097 static struct inode_operations proc_pid_link_inode_operations = {
1098 .readlink = proc_pid_readlink,
1099 .follow_link = proc_pid_follow_link
1104 static int proc_readfd(struct file * filp, void * dirent, filldir_t filldir)
1106 struct dentry *dentry = filp->f_dentry;
1107 struct inode *inode = dentry->d_inode;
1108 struct task_struct *p = proc_task(inode);
1109 unsigned int fd, tid, ino;
1112 struct files_struct * files;
1113 struct fdtable *fdt;
1124 if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0)
1128 ino = parent_ino(dentry);
1129 if (filldir(dirent, "..", 2, 1, ino, DT_DIR) < 0)
1133 files = get_files_struct(p);
1137 fdt = files_fdtable(files);
1138 for (fd = filp->f_pos-2;
1140 fd++, filp->f_pos++) {
1143 if (!fcheck_files(files, fd))
1151 buf[j] = '0' + (i % 10);
1155 ino = fake_ino(tid, PROC_TID_FD_DIR + fd);
1156 if (filldir(dirent, buf+j, NUMBUF-j, fd+2, ino, DT_LNK) < 0) {
1163 put_files_struct(files);
1169 static int proc_pident_readdir(struct file *filp,
1170 void *dirent, filldir_t filldir,
1171 struct pid_entry *ents, unsigned int nents)
1175 struct dentry *dentry = filp->f_dentry;
1176 struct inode *inode = dentry->d_inode;
1177 struct pid_entry *p;
1182 if (!pid_alive(proc_task(inode)))
1186 pid = proc_task(inode)->pid;
1191 if (filldir(dirent, ".", 1, i, ino, DT_DIR) < 0)
1197 ino = parent_ino(dentry);
1198 if (filldir(dirent, "..", 2, i, ino, DT_DIR) < 0)
1211 if (filldir(dirent, p->name, p->len, filp->f_pos,
1212 fake_ino(pid, p->type), p->mode >> 12) < 0)
1224 static int proc_tgid_base_readdir(struct file * filp,
1225 void * dirent, filldir_t filldir)
1227 return proc_pident_readdir(filp,dirent,filldir,
1228 tgid_base_stuff,ARRAY_SIZE(tgid_base_stuff));
1231 static int proc_tid_base_readdir(struct file * filp,
1232 void * dirent, filldir_t filldir)
1234 return proc_pident_readdir(filp,dirent,filldir,
1235 tid_base_stuff,ARRAY_SIZE(tid_base_stuff));
1238 /* building an inode */
1240 static int task_dumpable(struct task_struct *task)
1243 struct mm_struct *mm;
1248 dumpable = mm->dumpable;
1256 static struct inode *proc_pid_make_inode(struct super_block * sb, struct task_struct *task, int ino)
1258 struct inode * inode;
1259 struct proc_inode *ei;
1261 /* We need a new inode */
1263 inode = new_inode(sb);
1269 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
1270 inode->i_ino = fake_ino(task->pid, ino);
1272 if (!pid_alive(task))
1276 * grab the reference to task.
1278 get_task_struct(task);
1282 if (task_dumpable(task)) {
1283 inode->i_uid = task->euid;
1284 inode->i_gid = task->egid;
1286 security_task_to_inode(task, inode);
1299 * Exceptional case: normally we are not allowed to unhash a busy
1300 * directory. In this case, however, we can do it - no aliasing problems
1301 * due to the way we treat inodes.
1303 * Rewrite the inode's ownerships here because the owning task may have
1304 * performed a setuid(), etc.
1306 static int pid_revalidate(struct dentry *dentry, struct nameidata *nd)
1308 struct inode *inode = dentry->d_inode;
1309 struct task_struct *task = proc_task(inode);
1310 if (pid_alive(task)) {
1311 if (task_dumpable(task)) {
1312 inode->i_uid = task->euid;
1313 inode->i_gid = task->egid;
1318 security_task_to_inode(task, inode);
1325 static int tid_fd_revalidate(struct dentry *dentry, struct nameidata *nd)
1327 struct inode *inode = dentry->d_inode;
1328 struct task_struct *task = proc_task(inode);
1329 int fd = proc_fd(inode);
1330 struct files_struct *files;
1332 files = get_files_struct(task);
1335 if (fcheck_files(files, fd)) {
1337 put_files_struct(files);
1338 if (task_dumpable(task)) {
1339 inode->i_uid = task->euid;
1340 inode->i_gid = task->egid;
1345 security_task_to_inode(task, inode);
1349 put_files_struct(files);
1355 static int pid_delete_dentry(struct dentry * dentry)
1357 /* Is the task we represent dead?
1358 * If so, then don't put the dentry on the lru list,
1359 * kill it immediately.
1361 return !pid_alive(proc_task(dentry->d_inode));
1364 static struct dentry_operations tid_fd_dentry_operations =
1366 .d_revalidate = tid_fd_revalidate,
1367 .d_delete = pid_delete_dentry,
1370 static struct dentry_operations pid_dentry_operations =
1372 .d_revalidate = pid_revalidate,
1373 .d_delete = pid_delete_dentry,
1378 static unsigned name_to_int(struct dentry *dentry)
1380 const char *name = dentry->d_name.name;
1381 int len = dentry->d_name.len;
1384 if (len > 1 && *name == '0')
1387 unsigned c = *name++ - '0';
1390 if (n >= (~0U-9)/10)
1401 static struct dentry *proc_lookupfd(struct inode * dir, struct dentry * dentry, struct nameidata *nd)
1403 struct task_struct *task = proc_task(dir);
1404 unsigned fd = name_to_int(dentry);
1406 struct files_struct * files;
1407 struct inode *inode;
1408 struct proc_inode *ei;
1412 if (!pid_alive(task))
1415 inode = proc_pid_make_inode(dir->i_sb, task, PROC_TID_FD_DIR+fd);
1420 files = get_files_struct(task);
1423 inode->i_mode = S_IFLNK;
1426 * We are not taking a ref to the file structure, so we must
1429 spin_lock(&files->file_lock);
1430 file = fcheck_files(files, fd);
1433 if (file->f_mode & 1)
1434 inode->i_mode |= S_IRUSR | S_IXUSR;
1435 if (file->f_mode & 2)
1436 inode->i_mode |= S_IWUSR | S_IXUSR;
1437 spin_unlock(&files->file_lock);
1438 put_files_struct(files);
1439 inode->i_op = &proc_pid_link_inode_operations;
1441 ei->op.proc_get_link = proc_fd_link;
1442 dentry->d_op = &tid_fd_dentry_operations;
1443 d_add(dentry, inode);
1447 spin_unlock(&files->file_lock);
1448 put_files_struct(files);
1452 return ERR_PTR(-ENOENT);
1455 static int proc_task_readdir(struct file * filp, void * dirent, filldir_t filldir);
1456 static struct dentry *proc_task_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd);
1457 static int proc_task_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat);
1459 static struct file_operations proc_fd_operations = {
1460 .read = generic_read_dir,
1461 .readdir = proc_readfd,
1464 static struct file_operations proc_task_operations = {
1465 .read = generic_read_dir,
1466 .readdir = proc_task_readdir,
1470 * proc directories can do almost nothing..
1472 static struct inode_operations proc_fd_inode_operations = {
1473 .lookup = proc_lookupfd,
1476 static struct inode_operations proc_task_inode_operations = {
1477 .lookup = proc_task_lookup,
1478 .getattr = proc_task_getattr,
1481 #ifdef CONFIG_SECURITY
1482 static ssize_t proc_pid_attr_read(struct file * file, char __user * buf,
1483 size_t count, loff_t *ppos)
1485 struct inode * inode = file->f_dentry->d_inode;
1488 struct task_struct *task = proc_task(inode);
1490 if (count > PAGE_SIZE)
1492 if (!(page = __get_free_page(GFP_KERNEL)))
1495 length = security_getprocattr(task,
1496 (char*)file->f_dentry->d_name.name,
1497 (void*)page, count);
1499 length = simple_read_from_buffer(buf, count, ppos, (char *)page, length);
1504 static ssize_t proc_pid_attr_write(struct file * file, const char __user * buf,
1505 size_t count, loff_t *ppos)
1507 struct inode * inode = file->f_dentry->d_inode;
1510 struct task_struct *task = proc_task(inode);
1512 if (count > PAGE_SIZE)
1515 /* No partial writes. */
1518 page = (char*)__get_free_page(GFP_USER);
1522 if (copy_from_user(page, buf, count))
1525 length = security_setprocattr(task,
1526 (char*)file->f_dentry->d_name.name,
1527 (void*)page, count);
1529 free_page((unsigned long) page);
1533 static struct file_operations proc_pid_attr_operations = {
1534 .read = proc_pid_attr_read,
1535 .write = proc_pid_attr_write,
1538 static struct file_operations proc_tid_attr_operations;
1539 static struct inode_operations proc_tid_attr_inode_operations;
1540 static struct file_operations proc_tgid_attr_operations;
1541 static struct inode_operations proc_tgid_attr_inode_operations;
1544 static int get_tid_list(int index, unsigned int *tids, struct inode *dir);
1547 static struct dentry *proc_pident_lookup(struct inode *dir,
1548 struct dentry *dentry,
1549 struct pid_entry *ents)
1551 struct inode *inode;
1553 struct task_struct *task = proc_task(dir);
1554 struct pid_entry *p;
1555 struct proc_inode *ei;
1560 if (!pid_alive(task))
1563 for (p = ents; p->name; p++) {
1564 if (p->len != dentry->d_name.len)
1566 if (!memcmp(dentry->d_name.name, p->name, p->len))
1573 inode = proc_pid_make_inode(dir->i_sb, task, p->type);
1578 inode->i_mode = p->mode;
1580 * Yes, it does not scale. And it should not. Don't add
1581 * new entries into /proc/<tgid>/ without very good reasons.
1584 case PROC_TGID_TASK:
1586 inode->i_op = &proc_task_inode_operations;
1587 inode->i_fop = &proc_task_operations;
1592 inode->i_op = &proc_fd_inode_operations;
1593 inode->i_fop = &proc_fd_operations;
1597 inode->i_op = &proc_pid_link_inode_operations;
1598 ei->op.proc_get_link = proc_exe_link;
1602 inode->i_op = &proc_pid_link_inode_operations;
1603 ei->op.proc_get_link = proc_cwd_link;
1606 case PROC_TGID_ROOT:
1607 inode->i_op = &proc_pid_link_inode_operations;
1608 ei->op.proc_get_link = proc_root_link;
1610 case PROC_TID_ENVIRON:
1611 case PROC_TGID_ENVIRON:
1612 inode->i_fop = &proc_info_file_operations;
1613 ei->op.proc_read = proc_pid_environ;
1616 case PROC_TGID_AUXV:
1617 inode->i_fop = &proc_info_file_operations;
1618 ei->op.proc_read = proc_pid_auxv;
1620 case PROC_TID_STATUS:
1621 case PROC_TGID_STATUS:
1622 inode->i_fop = &proc_info_file_operations;
1623 ei->op.proc_read = proc_pid_status;
1626 inode->i_fop = &proc_info_file_operations;
1627 ei->op.proc_read = proc_tid_stat;
1629 case PROC_TGID_STAT:
1630 inode->i_fop = &proc_info_file_operations;
1631 ei->op.proc_read = proc_tgid_stat;
1633 case PROC_TID_CMDLINE:
1634 case PROC_TGID_CMDLINE:
1635 inode->i_fop = &proc_info_file_operations;
1636 ei->op.proc_read = proc_pid_cmdline;
1638 case PROC_TID_STATM:
1639 case PROC_TGID_STATM:
1640 inode->i_fop = &proc_info_file_operations;
1641 ei->op.proc_read = proc_pid_statm;
1644 case PROC_TGID_MAPS:
1645 inode->i_fop = &proc_maps_operations;
1648 case PROC_TID_NUMA_MAPS:
1649 case PROC_TGID_NUMA_MAPS:
1650 inode->i_fop = &proc_numa_maps_operations;
1655 inode->i_fop = &proc_mem_operations;
1657 #ifdef CONFIG_SECCOMP
1658 case PROC_TID_SECCOMP:
1659 case PROC_TGID_SECCOMP:
1660 inode->i_fop = &proc_seccomp_operations;
1662 #endif /* CONFIG_SECCOMP */
1663 case PROC_TID_MOUNTS:
1664 case PROC_TGID_MOUNTS:
1665 inode->i_fop = &proc_mounts_operations;
1668 case PROC_TID_SMAPS:
1669 case PROC_TGID_SMAPS:
1670 inode->i_fop = &proc_smaps_operations;
1673 case PROC_TID_MOUNTSTATS:
1674 case PROC_TGID_MOUNTSTATS:
1675 inode->i_fop = &proc_mountstats_operations;
1677 #ifdef CONFIG_SECURITY
1680 inode->i_op = &proc_tid_attr_inode_operations;
1681 inode->i_fop = &proc_tid_attr_operations;
1683 case PROC_TGID_ATTR:
1685 inode->i_op = &proc_tgid_attr_inode_operations;
1686 inode->i_fop = &proc_tgid_attr_operations;
1688 case PROC_TID_ATTR_CURRENT:
1689 case PROC_TGID_ATTR_CURRENT:
1690 case PROC_TID_ATTR_PREV:
1691 case PROC_TGID_ATTR_PREV:
1692 case PROC_TID_ATTR_EXEC:
1693 case PROC_TGID_ATTR_EXEC:
1694 case PROC_TID_ATTR_FSCREATE:
1695 case PROC_TGID_ATTR_FSCREATE:
1696 case PROC_TID_ATTR_KEYCREATE:
1697 case PROC_TGID_ATTR_KEYCREATE:
1698 inode->i_fop = &proc_pid_attr_operations;
1701 #ifdef CONFIG_KALLSYMS
1702 case PROC_TID_WCHAN:
1703 case PROC_TGID_WCHAN:
1704 inode->i_fop = &proc_info_file_operations;
1705 ei->op.proc_read = proc_pid_wchan;
1708 #ifdef CONFIG_SCHEDSTATS
1709 case PROC_TID_SCHEDSTAT:
1710 case PROC_TGID_SCHEDSTAT:
1711 inode->i_fop = &proc_info_file_operations;
1712 ei->op.proc_read = proc_pid_schedstat;
1715 #ifdef CONFIG_CPUSETS
1716 case PROC_TID_CPUSET:
1717 case PROC_TGID_CPUSET:
1718 inode->i_fop = &proc_cpuset_operations;
1721 case PROC_TID_OOM_SCORE:
1722 case PROC_TGID_OOM_SCORE:
1723 inode->i_fop = &proc_info_file_operations;
1724 ei->op.proc_read = proc_oom_score;
1726 case PROC_TID_OOM_ADJUST:
1727 case PROC_TGID_OOM_ADJUST:
1728 inode->i_fop = &proc_oom_adjust_operations;
1730 #ifdef CONFIG_AUDITSYSCALL
1731 case PROC_TID_LOGINUID:
1732 case PROC_TGID_LOGINUID:
1733 inode->i_fop = &proc_loginuid_operations;
1737 printk("procfs: impossible type (%d)",p->type);
1739 return ERR_PTR(-EINVAL);
1741 dentry->d_op = &pid_dentry_operations;
1742 d_add(dentry, inode);
1746 return ERR_PTR(error);
1749 static struct dentry *proc_tgid_base_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd){
1750 return proc_pident_lookup(dir, dentry, tgid_base_stuff);
1753 static struct dentry *proc_tid_base_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd){
1754 return proc_pident_lookup(dir, dentry, tid_base_stuff);
1757 static struct file_operations proc_tgid_base_operations = {
1758 .read = generic_read_dir,
1759 .readdir = proc_tgid_base_readdir,
1762 static struct file_operations proc_tid_base_operations = {
1763 .read = generic_read_dir,
1764 .readdir = proc_tid_base_readdir,
1767 static struct inode_operations proc_tgid_base_inode_operations = {
1768 .lookup = proc_tgid_base_lookup,
1771 static struct inode_operations proc_tid_base_inode_operations = {
1772 .lookup = proc_tid_base_lookup,
1775 #ifdef CONFIG_SECURITY
1776 static int proc_tgid_attr_readdir(struct file * filp,
1777 void * dirent, filldir_t filldir)
1779 return proc_pident_readdir(filp,dirent,filldir,
1780 tgid_attr_stuff,ARRAY_SIZE(tgid_attr_stuff));
1783 static int proc_tid_attr_readdir(struct file * filp,
1784 void * dirent, filldir_t filldir)
1786 return proc_pident_readdir(filp,dirent,filldir,
1787 tid_attr_stuff,ARRAY_SIZE(tid_attr_stuff));
1790 static struct file_operations proc_tgid_attr_operations = {
1791 .read = generic_read_dir,
1792 .readdir = proc_tgid_attr_readdir,
1795 static struct file_operations proc_tid_attr_operations = {
1796 .read = generic_read_dir,
1797 .readdir = proc_tid_attr_readdir,
1800 static struct dentry *proc_tgid_attr_lookup(struct inode *dir,
1801 struct dentry *dentry, struct nameidata *nd)
1803 return proc_pident_lookup(dir, dentry, tgid_attr_stuff);
1806 static struct dentry *proc_tid_attr_lookup(struct inode *dir,
1807 struct dentry *dentry, struct nameidata *nd)
1809 return proc_pident_lookup(dir, dentry, tid_attr_stuff);
1812 static struct inode_operations proc_tgid_attr_inode_operations = {
1813 .lookup = proc_tgid_attr_lookup,
1816 static struct inode_operations proc_tid_attr_inode_operations = {
1817 .lookup = proc_tid_attr_lookup,
1824 static int proc_self_readlink(struct dentry *dentry, char __user *buffer,
1828 sprintf(tmp, "%d", current->tgid);
1829 return vfs_readlink(dentry,buffer,buflen,tmp);
1832 static void *proc_self_follow_link(struct dentry *dentry, struct nameidata *nd)
1835 sprintf(tmp, "%d", current->tgid);
1836 return ERR_PTR(vfs_follow_link(nd,tmp));
1839 static struct inode_operations proc_self_inode_operations = {
1840 .readlink = proc_self_readlink,
1841 .follow_link = proc_self_follow_link,
1845 * proc_flush_task - Remove dcache entries for @task from the /proc dcache.
1847 * @task: task that should be flushed.
1849 * Looks in the dcache for
1851 * /proc/@tgid/task/@pid
1852 * if either directory is present flushes it and all of it'ts children
1855 * It is safe and reasonable to cache /proc entries for a task until
1856 * that task exits. After that they just clog up the dcache with
1857 * useless entries, possibly causing useful dcache entries to be
1858 * flushed instead. This routine is proved to flush those useless
1859 * dcache entries at process exit time.
1861 * NOTE: This routine is just an optimization so it does not guarantee
1862 * that no dcache entries will exist at process exit time it
1863 * just makes it very unlikely that any will persist.
1865 void proc_flush_task(struct task_struct *task)
1867 struct dentry *dentry, *leader, *dir;
1872 name.len = snprintf(buf, sizeof(buf), "%d", task->pid);
1873 dentry = d_hash_and_lookup(proc_mnt->mnt_root, &name);
1875 shrink_dcache_parent(dentry);
1880 if (thread_group_leader(task))
1884 name.len = snprintf(buf, sizeof(buf), "%d", task->tgid);
1885 leader = d_hash_and_lookup(proc_mnt->mnt_root, &name);
1890 name.len = strlen(name.name);
1891 dir = d_hash_and_lookup(leader, &name);
1893 goto out_put_leader;
1896 name.len = snprintf(buf, sizeof(buf), "%d", task->pid);
1897 dentry = d_hash_and_lookup(dir, &name);
1899 shrink_dcache_parent(dentry);
1912 struct dentry *proc_pid_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd)
1914 struct task_struct *task;
1915 struct inode *inode;
1916 struct proc_inode *ei;
1919 if (dentry->d_name.len == 4 && !memcmp(dentry->d_name.name,"self",4)) {
1920 inode = new_inode(dir->i_sb);
1922 return ERR_PTR(-ENOMEM);
1924 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
1925 inode->i_ino = fake_ino(0, PROC_TGID_INO);
1927 inode->i_mode = S_IFLNK|S_IRWXUGO;
1928 inode->i_uid = inode->i_gid = 0;
1930 inode->i_op = &proc_self_inode_operations;
1931 d_add(dentry, inode);
1934 tgid = name_to_int(dentry);
1938 read_lock(&tasklist_lock);
1939 task = find_task_by_pid(tgid);
1941 get_task_struct(task);
1942 read_unlock(&tasklist_lock);
1946 inode = proc_pid_make_inode(dir->i_sb, task, PROC_TGID_INO);
1950 put_task_struct(task);
1953 inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO;
1954 inode->i_op = &proc_tgid_base_inode_operations;
1955 inode->i_fop = &proc_tgid_base_operations;
1956 inode->i_flags|=S_IMMUTABLE;
1957 #ifdef CONFIG_SECURITY
1963 dentry->d_op = &pid_dentry_operations;
1965 d_add(dentry, inode);
1966 if (!pid_alive(task)) {
1968 shrink_dcache_parent(dentry);
1972 put_task_struct(task);
1975 return ERR_PTR(-ENOENT);
1979 static struct dentry *proc_task_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd)
1981 struct task_struct *task;
1982 struct task_struct *leader = proc_task(dir);
1983 struct inode *inode;
1986 tid = name_to_int(dentry);
1990 read_lock(&tasklist_lock);
1991 task = find_task_by_pid(tid);
1993 get_task_struct(task);
1994 read_unlock(&tasklist_lock);
1997 if (leader->tgid != task->tgid)
2000 inode = proc_pid_make_inode(dir->i_sb, task, PROC_TID_INO);
2005 inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO;
2006 inode->i_op = &proc_tid_base_inode_operations;
2007 inode->i_fop = &proc_tid_base_operations;
2008 inode->i_flags|=S_IMMUTABLE;
2009 #ifdef CONFIG_SECURITY
2015 dentry->d_op = &pid_dentry_operations;
2017 d_add(dentry, inode);
2019 put_task_struct(task);
2022 put_task_struct(task);
2024 return ERR_PTR(-ENOENT);
2027 #define PROC_NUMBUF 10
2028 #define PROC_MAXPIDS 20
2031 * Get a few tgid's to return for filldir - we need to hold the
2032 * tasklist lock while doing this, and we must release it before
2033 * we actually do the filldir itself, so we use a temp buffer..
2035 static int get_tgid_list(int index, unsigned long version, unsigned int *tgids)
2037 struct task_struct *p;
2041 read_lock(&tasklist_lock);
2044 p = find_task_by_pid(version);
2045 if (p && !thread_group_leader(p))
2052 p = next_task(&init_task);
2054 for ( ; p != &init_task; p = next_task(p)) {
2060 tgids[nr_tgids] = tgid;
2062 if (nr_tgids >= PROC_MAXPIDS)
2065 read_unlock(&tasklist_lock);
2070 * Get a few tid's to return for filldir - we need to hold the
2071 * tasklist lock while doing this, and we must release it before
2072 * we actually do the filldir itself, so we use a temp buffer..
2074 static int get_tid_list(int index, unsigned int *tids, struct inode *dir)
2076 struct task_struct *leader_task = proc_task(dir);
2077 struct task_struct *task = leader_task;
2081 read_lock(&tasklist_lock);
2083 * The starting point task (leader_task) might be an already
2084 * unlinked task, which cannot be used to access the task-list
2085 * via next_thread().
2087 if (pid_alive(task)) do {
2088 int tid = task->pid;
2093 tids[nr_tids] = tid;
2095 if (nr_tids >= PROC_MAXPIDS)
2097 } while ((task = next_thread(task)) != leader_task);
2098 read_unlock(&tasklist_lock);
2102 /* for the /proc/ directory itself, after non-process stuff has been done */
2103 int proc_pid_readdir(struct file * filp, void * dirent, filldir_t filldir)
2105 unsigned int tgid_array[PROC_MAXPIDS];
2106 char buf[PROC_NUMBUF];
2107 unsigned int nr = filp->f_pos - FIRST_PROCESS_ENTRY;
2108 unsigned int nr_tgids, i;
2112 ino_t ino = fake_ino(0,PROC_TGID_INO);
2113 if (filldir(dirent, "self", 4, filp->f_pos, ino, DT_LNK) < 0)
2119 /* f_version caches the tgid value that the last readdir call couldn't
2120 * return. lseek aka telldir automagically resets f_version to 0.
2122 next_tgid = filp->f_version;
2123 filp->f_version = 0;
2125 nr_tgids = get_tgid_list(nr, next_tgid, tgid_array);
2127 /* no more entries ! */
2132 /* do not use the last found pid, reserve it for next_tgid */
2133 if (nr_tgids == PROC_MAXPIDS) {
2135 next_tgid = tgid_array[nr_tgids];
2138 for (i=0;i<nr_tgids;i++) {
2139 int tgid = tgid_array[i];
2140 ino_t ino = fake_ino(tgid,PROC_TGID_INO);
2141 unsigned long j = PROC_NUMBUF;
2144 buf[--j] = '0' + (tgid % 10);
2145 while ((tgid /= 10) != 0);
2147 if (filldir(dirent, buf+j, PROC_NUMBUF-j, filp->f_pos, ino, DT_DIR) < 0) {
2148 /* returning this tgid failed, save it as the first
2149 * pid for the next readir call */
2150 filp->f_version = tgid_array[i];
2161 /* for the /proc/TGID/task/ directories */
2162 static int proc_task_readdir(struct file * filp, void * dirent, filldir_t filldir)
2164 unsigned int tid_array[PROC_MAXPIDS];
2165 char buf[PROC_NUMBUF];
2166 unsigned int nr_tids, i;
2167 struct dentry *dentry = filp->f_dentry;
2168 struct inode *inode = dentry->d_inode;
2169 int retval = -ENOENT;
2171 unsigned long pos = filp->f_pos; /* avoiding "long long" filp->f_pos */
2173 if (!pid_alive(proc_task(inode)))
2180 if (filldir(dirent, ".", 1, pos, ino, DT_DIR) < 0)
2185 ino = parent_ino(dentry);
2186 if (filldir(dirent, "..", 2, pos, ino, DT_DIR) < 0)
2192 nr_tids = get_tid_list(pos, tid_array, inode);
2194 for (i = 0; i < nr_tids; i++) {
2195 unsigned long j = PROC_NUMBUF;
2196 int tid = tid_array[i];
2198 ino = fake_ino(tid,PROC_TID_INO);
2201 buf[--j] = '0' + (tid % 10);
2202 while ((tid /= 10) != 0);
2204 if (filldir(dirent, buf+j, PROC_NUMBUF-j, pos, ino, DT_DIR) < 0)
2213 static int proc_task_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
2215 struct inode *inode = dentry->d_inode;
2216 struct task_struct *p = proc_task(inode);
2217 generic_fillattr(inode, stat);
2222 stat->nlink += atomic_read(&p->signal->count);