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 * For hysterical raisins we keep the same inumbers as in the old procfs.
79 * Feel free to change the macro below - just keep the range distinct from
80 * inumbers of the rest of procfs (currently those are in 0x0000--0xffff).
81 * As soon as we'll get a separate superblock we will be able to forget
82 * about magical ranges too.
85 #define fake_ino(pid,ino) (((pid)<<16)|(ino))
87 enum pid_directory_inos {
107 PROC_TGID_MOUNTSTATS,
112 #ifdef CONFIG_SCHEDSTATS
115 #ifdef CONFIG_CPUSETS
118 #ifdef CONFIG_SECURITY
120 PROC_TGID_ATTR_CURRENT,
123 PROC_TGID_ATTR_FSCREATE,
125 #ifdef CONFIG_AUDITSYSCALL
129 PROC_TGID_OOM_ADJUST,
133 #ifdef CONFIG_SECCOMP
153 #ifdef CONFIG_SCHEDSTATS
156 #ifdef CONFIG_CPUSETS
159 #ifdef CONFIG_SECURITY
161 PROC_TID_ATTR_CURRENT,
164 PROC_TID_ATTR_FSCREATE,
166 #ifdef CONFIG_AUDITSYSCALL
172 /* Add new entries before this */
173 PROC_TID_FD_DIR = 0x8000, /* 0x8000-0xffff */
183 #define E(type,name,mode) {(type),sizeof(name)-1,(name),(mode)}
185 static struct pid_entry tgid_base_stuff[] = {
186 E(PROC_TGID_TASK, "task", S_IFDIR|S_IRUGO|S_IXUGO),
187 E(PROC_TGID_FD, "fd", S_IFDIR|S_IRUSR|S_IXUSR),
188 E(PROC_TGID_ENVIRON, "environ", S_IFREG|S_IRUSR),
189 E(PROC_TGID_AUXV, "auxv", S_IFREG|S_IRUSR),
190 E(PROC_TGID_STATUS, "status", S_IFREG|S_IRUGO),
191 E(PROC_TGID_CMDLINE, "cmdline", S_IFREG|S_IRUGO),
192 E(PROC_TGID_STAT, "stat", S_IFREG|S_IRUGO),
193 E(PROC_TGID_STATM, "statm", S_IFREG|S_IRUGO),
194 E(PROC_TGID_MAPS, "maps", S_IFREG|S_IRUGO),
196 E(PROC_TGID_NUMA_MAPS, "numa_maps", S_IFREG|S_IRUGO),
198 E(PROC_TGID_MEM, "mem", S_IFREG|S_IRUSR|S_IWUSR),
199 #ifdef CONFIG_SECCOMP
200 E(PROC_TGID_SECCOMP, "seccomp", S_IFREG|S_IRUSR|S_IWUSR),
202 E(PROC_TGID_CWD, "cwd", S_IFLNK|S_IRWXUGO),
203 E(PROC_TGID_ROOT, "root", S_IFLNK|S_IRWXUGO),
204 E(PROC_TGID_EXE, "exe", S_IFLNK|S_IRWXUGO),
205 E(PROC_TGID_MOUNTS, "mounts", S_IFREG|S_IRUGO),
206 E(PROC_TGID_MOUNTSTATS, "mountstats", S_IFREG|S_IRUSR),
208 E(PROC_TGID_SMAPS, "smaps", S_IFREG|S_IRUGO),
210 #ifdef CONFIG_SECURITY
211 E(PROC_TGID_ATTR, "attr", S_IFDIR|S_IRUGO|S_IXUGO),
213 #ifdef CONFIG_KALLSYMS
214 E(PROC_TGID_WCHAN, "wchan", S_IFREG|S_IRUGO),
216 #ifdef CONFIG_SCHEDSTATS
217 E(PROC_TGID_SCHEDSTAT, "schedstat", S_IFREG|S_IRUGO),
219 #ifdef CONFIG_CPUSETS
220 E(PROC_TGID_CPUSET, "cpuset", S_IFREG|S_IRUGO),
222 E(PROC_TGID_OOM_SCORE, "oom_score",S_IFREG|S_IRUGO),
223 E(PROC_TGID_OOM_ADJUST,"oom_adj", S_IFREG|S_IRUGO|S_IWUSR),
224 #ifdef CONFIG_AUDITSYSCALL
225 E(PROC_TGID_LOGINUID, "loginuid", S_IFREG|S_IWUSR|S_IRUGO),
229 static struct pid_entry tid_base_stuff[] = {
230 E(PROC_TID_FD, "fd", S_IFDIR|S_IRUSR|S_IXUSR),
231 E(PROC_TID_ENVIRON, "environ", S_IFREG|S_IRUSR),
232 E(PROC_TID_AUXV, "auxv", S_IFREG|S_IRUSR),
233 E(PROC_TID_STATUS, "status", S_IFREG|S_IRUGO),
234 E(PROC_TID_CMDLINE, "cmdline", S_IFREG|S_IRUGO),
235 E(PROC_TID_STAT, "stat", S_IFREG|S_IRUGO),
236 E(PROC_TID_STATM, "statm", S_IFREG|S_IRUGO),
237 E(PROC_TID_MAPS, "maps", S_IFREG|S_IRUGO),
239 E(PROC_TID_NUMA_MAPS, "numa_maps", S_IFREG|S_IRUGO),
241 E(PROC_TID_MEM, "mem", S_IFREG|S_IRUSR|S_IWUSR),
242 #ifdef CONFIG_SECCOMP
243 E(PROC_TID_SECCOMP, "seccomp", S_IFREG|S_IRUSR|S_IWUSR),
245 E(PROC_TID_CWD, "cwd", S_IFLNK|S_IRWXUGO),
246 E(PROC_TID_ROOT, "root", S_IFLNK|S_IRWXUGO),
247 E(PROC_TID_EXE, "exe", S_IFLNK|S_IRWXUGO),
248 E(PROC_TID_MOUNTS, "mounts", S_IFREG|S_IRUGO),
250 E(PROC_TID_SMAPS, "smaps", S_IFREG|S_IRUGO),
252 #ifdef CONFIG_SECURITY
253 E(PROC_TID_ATTR, "attr", S_IFDIR|S_IRUGO|S_IXUGO),
255 #ifdef CONFIG_KALLSYMS
256 E(PROC_TID_WCHAN, "wchan", S_IFREG|S_IRUGO),
258 #ifdef CONFIG_SCHEDSTATS
259 E(PROC_TID_SCHEDSTAT, "schedstat",S_IFREG|S_IRUGO),
261 #ifdef CONFIG_CPUSETS
262 E(PROC_TID_CPUSET, "cpuset", S_IFREG|S_IRUGO),
264 E(PROC_TID_OOM_SCORE, "oom_score",S_IFREG|S_IRUGO),
265 E(PROC_TID_OOM_ADJUST, "oom_adj", S_IFREG|S_IRUGO|S_IWUSR),
266 #ifdef CONFIG_AUDITSYSCALL
267 E(PROC_TID_LOGINUID, "loginuid", S_IFREG|S_IWUSR|S_IRUGO),
272 #ifdef CONFIG_SECURITY
273 static struct pid_entry tgid_attr_stuff[] = {
274 E(PROC_TGID_ATTR_CURRENT, "current", S_IFREG|S_IRUGO|S_IWUGO),
275 E(PROC_TGID_ATTR_PREV, "prev", S_IFREG|S_IRUGO),
276 E(PROC_TGID_ATTR_EXEC, "exec", S_IFREG|S_IRUGO|S_IWUGO),
277 E(PROC_TGID_ATTR_FSCREATE, "fscreate", S_IFREG|S_IRUGO|S_IWUGO),
280 static struct pid_entry tid_attr_stuff[] = {
281 E(PROC_TID_ATTR_CURRENT, "current", S_IFREG|S_IRUGO|S_IWUGO),
282 E(PROC_TID_ATTR_PREV, "prev", S_IFREG|S_IRUGO),
283 E(PROC_TID_ATTR_EXEC, "exec", S_IFREG|S_IRUGO|S_IWUGO),
284 E(PROC_TID_ATTR_FSCREATE, "fscreate", S_IFREG|S_IRUGO|S_IWUGO),
291 static int proc_fd_link(struct inode *inode, struct dentry **dentry, struct vfsmount **mnt)
293 struct task_struct *task = proc_task(inode);
294 struct files_struct *files;
296 int fd = proc_type(inode) - PROC_TID_FD_DIR;
298 files = get_files_struct(task);
301 * We are not taking a ref to the file structure, so we must
304 spin_lock(&files->file_lock);
305 file = fcheck_files(files, fd);
307 *mnt = mntget(file->f_vfsmnt);
308 *dentry = dget(file->f_dentry);
309 spin_unlock(&files->file_lock);
310 put_files_struct(files);
313 spin_unlock(&files->file_lock);
314 put_files_struct(files);
319 static struct fs_struct *get_fs_struct(struct task_struct *task)
321 struct fs_struct *fs;
325 atomic_inc(&fs->count);
330 static int proc_cwd_link(struct inode *inode, struct dentry **dentry, struct vfsmount **mnt)
332 struct fs_struct *fs = get_fs_struct(proc_task(inode));
333 int result = -ENOENT;
335 read_lock(&fs->lock);
336 *mnt = mntget(fs->pwdmnt);
337 *dentry = dget(fs->pwd);
338 read_unlock(&fs->lock);
345 static int proc_root_link(struct inode *inode, struct dentry **dentry, struct vfsmount **mnt)
347 struct fs_struct *fs = get_fs_struct(proc_task(inode));
348 int result = -ENOENT;
350 read_lock(&fs->lock);
351 *mnt = mntget(fs->rootmnt);
352 *dentry = dget(fs->root);
353 read_unlock(&fs->lock);
361 /* Same as proc_root_link, but this addionally tries to get fs from other
362 * threads in the group */
363 static int proc_task_root_link(struct inode *inode, struct dentry **dentry,
364 struct vfsmount **mnt)
366 struct fs_struct *fs;
367 int result = -ENOENT;
368 struct task_struct *leader = proc_task(inode);
373 atomic_inc(&fs->count);
376 /* Try to get fs from other threads */
378 read_lock(&tasklist_lock);
379 if (pid_alive(leader)) {
380 struct task_struct *task = leader;
382 while ((task = next_thread(task)) != leader) {
386 atomic_inc(&fs->count);
393 read_unlock(&tasklist_lock);
397 read_lock(&fs->lock);
398 *mnt = mntget(fs->rootmnt);
399 *dentry = dget(fs->root);
400 read_unlock(&fs->lock);
408 #define MAY_PTRACE(task) \
409 (task == current || \
410 (task->parent == current && \
411 (task->ptrace & PT_PTRACED) && \
412 (task->state == TASK_STOPPED || task->state == TASK_TRACED) && \
413 security_ptrace(current,task) == 0))
415 static int proc_pid_environ(struct task_struct *task, char * buffer)
418 struct mm_struct *mm = get_task_mm(task);
420 unsigned int len = mm->env_end - mm->env_start;
423 res = access_process_vm(task, mm->env_start, buffer, len, 0);
424 if (!ptrace_may_attach(task))
431 static int proc_pid_cmdline(struct task_struct *task, char * buffer)
435 struct mm_struct *mm = get_task_mm(task);
439 goto out_mm; /* Shh! No looking before we're done */
441 len = mm->arg_end - mm->arg_start;
446 res = access_process_vm(task, mm->arg_start, buffer, len, 0);
448 // If the nul at the end of args has been overwritten, then
449 // assume application is using setproctitle(3).
450 if (res > 0 && buffer[res-1] != '\0' && len < PAGE_SIZE) {
451 len = strnlen(buffer, res);
455 len = mm->env_end - mm->env_start;
456 if (len > PAGE_SIZE - res)
457 len = PAGE_SIZE - res;
458 res += access_process_vm(task, mm->env_start, buffer+res, len, 0);
459 res = strnlen(buffer, res);
468 static int proc_pid_auxv(struct task_struct *task, char *buffer)
471 struct mm_struct *mm = get_task_mm(task);
473 unsigned int nwords = 0;
476 while (mm->saved_auxv[nwords - 2] != 0); /* AT_NULL */
477 res = nwords * sizeof(mm->saved_auxv[0]);
480 memcpy(buffer, mm->saved_auxv, res);
487 #ifdef CONFIG_KALLSYMS
489 * Provides a wchan file via kallsyms in a proper one-value-per-file format.
490 * Returns the resolved symbol. If that fails, simply return the address.
492 static int proc_pid_wchan(struct task_struct *task, char *buffer)
495 const char *sym_name;
496 unsigned long wchan, size, offset;
497 char namebuf[KSYM_NAME_LEN+1];
499 wchan = get_wchan(task);
501 sym_name = kallsyms_lookup(wchan, &size, &offset, &modname, namebuf);
503 return sprintf(buffer, "%s", sym_name);
504 return sprintf(buffer, "%lu", wchan);
506 #endif /* CONFIG_KALLSYMS */
508 #ifdef CONFIG_SCHEDSTATS
510 * Provides /proc/PID/schedstat
512 static int proc_pid_schedstat(struct task_struct *task, char *buffer)
514 return sprintf(buffer, "%lu %lu %lu\n",
515 task->sched_info.cpu_time,
516 task->sched_info.run_delay,
517 task->sched_info.pcnt);
521 /* The badness from the OOM killer */
522 unsigned long badness(struct task_struct *p, unsigned long uptime);
523 static int proc_oom_score(struct task_struct *task, char *buffer)
525 unsigned long points;
526 struct timespec uptime;
528 do_posix_clock_monotonic_gettime(&uptime);
529 points = badness(task, uptime.tv_sec);
530 return sprintf(buffer, "%lu\n", points);
533 /************************************************************************/
534 /* Here the fs part begins */
535 /************************************************************************/
537 /* permission checks */
539 /* If the process being read is separated by chroot from the reading process,
540 * don't let the reader access the threads.
542 * note: this does dput(root) and mntput(vfsmnt) on exit.
544 static int proc_check_chroot(struct dentry *root, struct vfsmount *vfsmnt)
546 struct dentry *de, *base;
547 struct vfsmount *our_vfsmnt, *mnt;
550 read_lock(¤t->fs->lock);
551 our_vfsmnt = mntget(current->fs->rootmnt);
552 base = dget(current->fs->root);
553 read_unlock(¤t->fs->lock);
555 spin_lock(&vfsmount_lock);
559 while (mnt != our_vfsmnt) {
560 if (mnt == mnt->mnt_parent)
562 de = mnt->mnt_mountpoint;
563 mnt = mnt->mnt_parent;
566 if (!is_subdir(de, base))
568 spin_unlock(&vfsmount_lock);
577 spin_unlock(&vfsmount_lock);
582 static int proc_check_root(struct inode *inode)
585 struct vfsmount *vfsmnt;
587 if (proc_root_link(inode, &root, &vfsmnt)) /* Ewww... */
589 return proc_check_chroot(root, vfsmnt);
592 static int proc_permission(struct inode *inode, int mask, struct nameidata *nd)
594 if (generic_permission(inode, mask, NULL) != 0)
596 return proc_check_root(inode);
599 static int proc_task_permission(struct inode *inode, int mask, struct nameidata *nd)
602 struct vfsmount *vfsmnt;
604 if (generic_permission(inode, mask, NULL) != 0)
607 if (proc_task_root_link(inode, &root, &vfsmnt))
610 return proc_check_chroot(root, vfsmnt);
613 extern struct seq_operations proc_pid_maps_op;
614 static int maps_open(struct inode *inode, struct file *file)
616 struct task_struct *task = proc_task(inode);
617 int ret = seq_open(file, &proc_pid_maps_op);
619 struct seq_file *m = file->private_data;
625 static struct file_operations proc_maps_operations = {
629 .release = seq_release,
633 extern struct seq_operations proc_pid_numa_maps_op;
634 static int numa_maps_open(struct inode *inode, struct file *file)
636 struct task_struct *task = proc_task(inode);
637 int ret = seq_open(file, &proc_pid_numa_maps_op);
639 struct seq_file *m = file->private_data;
645 static struct file_operations proc_numa_maps_operations = {
646 .open = numa_maps_open,
649 .release = seq_release,
654 extern struct seq_operations proc_pid_smaps_op;
655 static int smaps_open(struct inode *inode, struct file *file)
657 struct task_struct *task = proc_task(inode);
658 int ret = seq_open(file, &proc_pid_smaps_op);
660 struct seq_file *m = file->private_data;
666 static struct file_operations proc_smaps_operations = {
670 .release = seq_release,
674 extern struct seq_operations mounts_op;
680 static int mounts_open(struct inode *inode, struct file *file)
682 struct task_struct *task = proc_task(inode);
683 struct namespace *namespace;
684 struct proc_mounts *p;
688 namespace = task->namespace;
690 get_namespace(namespace);
695 p = kmalloc(sizeof(struct proc_mounts), GFP_KERNEL);
697 file->private_data = &p->m;
698 ret = seq_open(file, &mounts_op);
700 p->m.private = namespace;
701 p->event = namespace->event;
706 put_namespace(namespace);
711 static int mounts_release(struct inode *inode, struct file *file)
713 struct seq_file *m = file->private_data;
714 struct namespace *namespace = m->private;
715 put_namespace(namespace);
716 return seq_release(inode, file);
719 static unsigned mounts_poll(struct file *file, poll_table *wait)
721 struct proc_mounts *p = file->private_data;
722 struct namespace *ns = p->m.private;
725 poll_wait(file, &ns->poll, wait);
727 spin_lock(&vfsmount_lock);
728 if (p->event != ns->event) {
729 p->event = ns->event;
732 spin_unlock(&vfsmount_lock);
737 static struct file_operations proc_mounts_operations = {
741 .release = mounts_release,
745 extern struct seq_operations mountstats_op;
746 static int mountstats_open(struct inode *inode, struct file *file)
748 struct task_struct *task = proc_task(inode);
749 int ret = seq_open(file, &mountstats_op);
752 struct seq_file *m = file->private_data;
753 struct namespace *namespace;
755 namespace = task->namespace;
757 get_namespace(namespace);
761 m->private = namespace;
763 seq_release(inode, file);
770 static struct file_operations proc_mountstats_operations = {
771 .open = mountstats_open,
774 .release = mounts_release,
777 #define PROC_BLOCK_SIZE (3*1024) /* 4K page size but our output routines use some slack for overruns */
779 static ssize_t proc_info_read(struct file * file, char __user * buf,
780 size_t count, loff_t *ppos)
782 struct inode * inode = file->f_dentry->d_inode;
785 struct task_struct *task = proc_task(inode);
787 if (count > PROC_BLOCK_SIZE)
788 count = PROC_BLOCK_SIZE;
789 if (!(page = __get_free_page(GFP_KERNEL)))
792 length = PROC_I(inode)->op.proc_read(task, (char*)page);
795 length = simple_read_from_buffer(buf, count, ppos, (char *)page, length);
800 static struct file_operations proc_info_file_operations = {
801 .read = proc_info_read,
804 static int mem_open(struct inode* inode, struct file* file)
806 file->private_data = (void*)((long)current->self_exec_id);
810 static ssize_t mem_read(struct file * file, char __user * buf,
811 size_t count, loff_t *ppos)
813 struct task_struct *task = proc_task(file->f_dentry->d_inode);
815 unsigned long src = *ppos;
817 struct mm_struct *mm;
819 if (!MAY_PTRACE(task) || !ptrace_may_attach(task))
823 page = (char *)__get_free_page(GFP_USER);
829 mm = get_task_mm(task);
835 if (file->private_data != (void*)((long)current->self_exec_id))
841 int this_len, retval;
843 this_len = (count > PAGE_SIZE) ? PAGE_SIZE : count;
844 retval = access_process_vm(task, src, page, this_len, 0);
845 if (!retval || !MAY_PTRACE(task) || !ptrace_may_attach(task)) {
851 if (copy_to_user(buf, page, retval)) {
866 free_page((unsigned long) page);
871 #define mem_write NULL
874 /* This is a security hazard */
875 static ssize_t mem_write(struct file * file, const char * buf,
876 size_t count, loff_t *ppos)
880 struct task_struct *task = proc_task(file->f_dentry->d_inode);
881 unsigned long dst = *ppos;
883 if (!MAY_PTRACE(task) || !ptrace_may_attach(task))
886 page = (char *)__get_free_page(GFP_USER);
891 int this_len, retval;
893 this_len = (count > PAGE_SIZE) ? PAGE_SIZE : count;
894 if (copy_from_user(page, buf, this_len)) {
898 retval = access_process_vm(task, dst, page, this_len, 1);
910 free_page((unsigned long) page);
915 static loff_t mem_lseek(struct file * file, loff_t offset, int orig)
919 file->f_pos = offset;
922 file->f_pos += offset;
927 force_successful_syscall_return();
931 static struct file_operations proc_mem_operations = {
938 static ssize_t oom_adjust_read(struct file *file, char __user *buf,
939 size_t count, loff_t *ppos)
941 struct task_struct *task = proc_task(file->f_dentry->d_inode);
944 int oom_adjust = task->oomkilladj;
945 loff_t __ppos = *ppos;
947 len = sprintf(buffer, "%i\n", oom_adjust);
950 if (count > len-__ppos)
952 if (copy_to_user(buf, buffer + __ppos, count))
954 *ppos = __ppos + count;
958 static ssize_t oom_adjust_write(struct file *file, const char __user *buf,
959 size_t count, loff_t *ppos)
961 struct task_struct *task = proc_task(file->f_dentry->d_inode);
962 char buffer[8], *end;
965 if (!capable(CAP_SYS_RESOURCE))
967 memset(buffer, 0, 8);
970 if (copy_from_user(buffer, buf, count))
972 oom_adjust = simple_strtol(buffer, &end, 0);
973 if ((oom_adjust < -16 || oom_adjust > 15) && oom_adjust != OOM_DISABLE)
977 task->oomkilladj = oom_adjust;
978 if (end - buffer == 0)
983 static struct file_operations proc_oom_adjust_operations = {
984 .read = oom_adjust_read,
985 .write = oom_adjust_write,
988 static struct inode_operations proc_mem_inode_operations = {
989 .permission = proc_permission,
992 #ifdef CONFIG_AUDITSYSCALL
994 static ssize_t proc_loginuid_read(struct file * file, char __user * buf,
995 size_t count, loff_t *ppos)
997 struct inode * inode = file->f_dentry->d_inode;
998 struct task_struct *task = proc_task(inode);
1000 char tmpbuf[TMPBUFLEN];
1002 length = scnprintf(tmpbuf, TMPBUFLEN, "%u",
1003 audit_get_loginuid(task->audit_context));
1004 return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
1007 static ssize_t proc_loginuid_write(struct file * file, const char __user * buf,
1008 size_t count, loff_t *ppos)
1010 struct inode * inode = file->f_dentry->d_inode;
1013 struct task_struct *task = proc_task(inode);
1016 if (!capable(CAP_AUDIT_CONTROL))
1019 if (current != task)
1022 if (count >= PAGE_SIZE)
1023 count = PAGE_SIZE - 1;
1026 /* No partial writes. */
1029 page = (char*)__get_free_page(GFP_USER);
1033 if (copy_from_user(page, buf, count))
1037 loginuid = simple_strtoul(page, &tmp, 10);
1043 length = audit_set_loginuid(task, loginuid);
1044 if (likely(length == 0))
1048 free_page((unsigned long) page);
1052 static struct file_operations proc_loginuid_operations = {
1053 .read = proc_loginuid_read,
1054 .write = proc_loginuid_write,
1058 #ifdef CONFIG_SECCOMP
1059 static ssize_t seccomp_read(struct file *file, char __user *buf,
1060 size_t count, loff_t *ppos)
1062 struct task_struct *tsk = proc_task(file->f_dentry->d_inode);
1064 loff_t __ppos = *ppos;
1067 /* no need to print the trailing zero, so use only len */
1068 len = sprintf(__buf, "%u\n", tsk->seccomp.mode);
1071 if (count > len - __ppos)
1072 count = len - __ppos;
1073 if (copy_to_user(buf, __buf + __ppos, count))
1075 *ppos = __ppos + count;
1079 static ssize_t seccomp_write(struct file *file, const char __user *buf,
1080 size_t count, loff_t *ppos)
1082 struct task_struct *tsk = proc_task(file->f_dentry->d_inode);
1083 char __buf[20], *end;
1084 unsigned int seccomp_mode;
1086 /* can set it only once to be even more secure */
1087 if (unlikely(tsk->seccomp.mode))
1090 memset(__buf, 0, sizeof(__buf));
1091 count = min(count, sizeof(__buf) - 1);
1092 if (copy_from_user(__buf, buf, count))
1094 seccomp_mode = simple_strtoul(__buf, &end, 0);
1097 if (seccomp_mode && seccomp_mode <= NR_SECCOMP_MODES) {
1098 tsk->seccomp.mode = seccomp_mode;
1099 set_tsk_thread_flag(tsk, TIF_SECCOMP);
1102 if (unlikely(!(end - __buf)))
1107 static struct file_operations proc_seccomp_operations = {
1108 .read = seccomp_read,
1109 .write = seccomp_write,
1111 #endif /* CONFIG_SECCOMP */
1113 static void *proc_pid_follow_link(struct dentry *dentry, struct nameidata *nd)
1115 struct inode *inode = dentry->d_inode;
1116 int error = -EACCES;
1118 /* We don't need a base pointer in the /proc filesystem */
1121 if (current->fsuid != inode->i_uid && !capable(CAP_DAC_OVERRIDE))
1123 error = proc_check_root(inode);
1127 error = PROC_I(inode)->op.proc_get_link(inode, &nd->dentry, &nd->mnt);
1128 nd->last_type = LAST_BIND;
1130 return ERR_PTR(error);
1133 static int do_proc_readlink(struct dentry *dentry, struct vfsmount *mnt,
1134 char __user *buffer, int buflen)
1136 struct inode * inode;
1137 char *tmp = (char*)__get_free_page(GFP_KERNEL), *path;
1143 inode = dentry->d_inode;
1144 path = d_path(dentry, mnt, tmp, PAGE_SIZE);
1145 len = PTR_ERR(path);
1148 len = tmp + PAGE_SIZE - 1 - path;
1152 if (copy_to_user(buffer, path, len))
1155 free_page((unsigned long)tmp);
1159 static int proc_pid_readlink(struct dentry * dentry, char __user * buffer, int buflen)
1161 int error = -EACCES;
1162 struct inode *inode = dentry->d_inode;
1164 struct vfsmount *mnt = NULL;
1168 if (current->fsuid != inode->i_uid && !capable(CAP_DAC_OVERRIDE))
1170 error = proc_check_root(inode);
1174 error = PROC_I(inode)->op.proc_get_link(inode, &de, &mnt);
1178 error = do_proc_readlink(de, mnt, buffer, buflen);
1186 static struct inode_operations proc_pid_link_inode_operations = {
1187 .readlink = proc_pid_readlink,
1188 .follow_link = proc_pid_follow_link
1193 static int proc_readfd(struct file * filp, void * dirent, filldir_t filldir)
1195 struct inode *inode = filp->f_dentry->d_inode;
1196 struct task_struct *p = proc_task(inode);
1197 unsigned int fd, tid, ino;
1200 struct files_struct * files;
1201 struct fdtable *fdt;
1212 if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0)
1216 ino = fake_ino(tid, PROC_TID_INO);
1217 if (filldir(dirent, "..", 2, 1, ino, DT_DIR) < 0)
1221 files = get_files_struct(p);
1225 fdt = files_fdtable(files);
1226 for (fd = filp->f_pos-2;
1228 fd++, filp->f_pos++) {
1231 if (!fcheck_files(files, fd))
1239 buf[j] = '0' + (i % 10);
1243 ino = fake_ino(tid, PROC_TID_FD_DIR + fd);
1244 if (filldir(dirent, buf+j, NUMBUF-j, fd+2, ino, DT_LNK) < 0) {
1251 put_files_struct(files);
1257 static int proc_pident_readdir(struct file *filp,
1258 void *dirent, filldir_t filldir,
1259 struct pid_entry *ents, unsigned int nents)
1263 struct dentry *dentry = filp->f_dentry;
1264 struct inode *inode = dentry->d_inode;
1265 struct pid_entry *p;
1270 if (!pid_alive(proc_task(inode)))
1274 pid = proc_task(inode)->pid;
1279 if (filldir(dirent, ".", 1, i, ino, DT_DIR) < 0)
1285 ino = parent_ino(dentry);
1286 if (filldir(dirent, "..", 2, i, ino, DT_DIR) < 0)
1299 if (filldir(dirent, p->name, p->len, filp->f_pos,
1300 fake_ino(pid, p->type), p->mode >> 12) < 0)
1312 static int proc_tgid_base_readdir(struct file * filp,
1313 void * dirent, filldir_t filldir)
1315 return proc_pident_readdir(filp,dirent,filldir,
1316 tgid_base_stuff,ARRAY_SIZE(tgid_base_stuff));
1319 static int proc_tid_base_readdir(struct file * filp,
1320 void * dirent, filldir_t filldir)
1322 return proc_pident_readdir(filp,dirent,filldir,
1323 tid_base_stuff,ARRAY_SIZE(tid_base_stuff));
1326 /* building an inode */
1328 static int task_dumpable(struct task_struct *task)
1331 struct mm_struct *mm;
1336 dumpable = mm->dumpable;
1344 static struct inode *proc_pid_make_inode(struct super_block * sb, struct task_struct *task, int ino)
1346 struct inode * inode;
1347 struct proc_inode *ei;
1349 /* We need a new inode */
1351 inode = new_inode(sb);
1358 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
1359 inode->i_ino = fake_ino(task->pid, ino);
1361 if (!pid_alive(task))
1365 * grab the reference to task.
1367 get_task_struct(task);
1372 if (ino == PROC_TGID_INO || ino == PROC_TID_INO || task_dumpable(task)) {
1373 inode->i_uid = task->euid;
1374 inode->i_gid = task->egid;
1376 security_task_to_inode(task, inode);
1390 * Exceptional case: normally we are not allowed to unhash a busy
1391 * directory. In this case, however, we can do it - no aliasing problems
1392 * due to the way we treat inodes.
1394 * Rewrite the inode's ownerships here because the owning task may have
1395 * performed a setuid(), etc.
1397 static int pid_revalidate(struct dentry *dentry, struct nameidata *nd)
1399 struct inode *inode = dentry->d_inode;
1400 struct task_struct *task = proc_task(inode);
1401 if (pid_alive(task)) {
1402 if (proc_type(inode) == PROC_TGID_INO || proc_type(inode) == PROC_TID_INO || task_dumpable(task)) {
1403 inode->i_uid = task->euid;
1404 inode->i_gid = task->egid;
1409 security_task_to_inode(task, inode);
1416 static int tid_fd_revalidate(struct dentry *dentry, struct nameidata *nd)
1418 struct inode *inode = dentry->d_inode;
1419 struct task_struct *task = proc_task(inode);
1420 int fd = proc_type(inode) - PROC_TID_FD_DIR;
1421 struct files_struct *files;
1423 files = get_files_struct(task);
1426 if (fcheck_files(files, fd)) {
1428 put_files_struct(files);
1429 if (task_dumpable(task)) {
1430 inode->i_uid = task->euid;
1431 inode->i_gid = task->egid;
1436 security_task_to_inode(task, inode);
1440 put_files_struct(files);
1446 static void pid_base_iput(struct dentry *dentry, struct inode *inode)
1448 struct task_struct *task = proc_task(inode);
1449 spin_lock(&task->proc_lock);
1450 if (task->proc_dentry == dentry)
1451 task->proc_dentry = NULL;
1452 spin_unlock(&task->proc_lock);
1456 static int pid_delete_dentry(struct dentry * dentry)
1458 /* Is the task we represent dead?
1459 * If so, then don't put the dentry on the lru list,
1460 * kill it immediately.
1462 return !pid_alive(proc_task(dentry->d_inode));
1465 static struct dentry_operations tid_fd_dentry_operations =
1467 .d_revalidate = tid_fd_revalidate,
1468 .d_delete = pid_delete_dentry,
1471 static struct dentry_operations pid_dentry_operations =
1473 .d_revalidate = pid_revalidate,
1474 .d_delete = pid_delete_dentry,
1477 static struct dentry_operations pid_base_dentry_operations =
1479 .d_revalidate = pid_revalidate,
1480 .d_iput = pid_base_iput,
1481 .d_delete = pid_delete_dentry,
1486 static unsigned name_to_int(struct dentry *dentry)
1488 const char *name = dentry->d_name.name;
1489 int len = dentry->d_name.len;
1492 if (len > 1 && *name == '0')
1495 unsigned c = *name++ - '0';
1498 if (n >= (~0U-9)/10)
1509 static struct dentry *proc_lookupfd(struct inode * dir, struct dentry * dentry, struct nameidata *nd)
1511 struct task_struct *task = proc_task(dir);
1512 unsigned fd = name_to_int(dentry);
1514 struct files_struct * files;
1515 struct inode *inode;
1516 struct proc_inode *ei;
1520 if (!pid_alive(task))
1523 inode = proc_pid_make_inode(dir->i_sb, task, PROC_TID_FD_DIR+fd);
1527 files = get_files_struct(task);
1530 inode->i_mode = S_IFLNK;
1533 * We are not taking a ref to the file structure, so we must
1536 spin_lock(&files->file_lock);
1537 file = fcheck_files(files, fd);
1540 if (file->f_mode & 1)
1541 inode->i_mode |= S_IRUSR | S_IXUSR;
1542 if (file->f_mode & 2)
1543 inode->i_mode |= S_IWUSR | S_IXUSR;
1544 spin_unlock(&files->file_lock);
1545 put_files_struct(files);
1546 inode->i_op = &proc_pid_link_inode_operations;
1548 ei->op.proc_get_link = proc_fd_link;
1549 dentry->d_op = &tid_fd_dentry_operations;
1550 d_add(dentry, inode);
1554 spin_unlock(&files->file_lock);
1555 put_files_struct(files);
1559 return ERR_PTR(-ENOENT);
1562 static int proc_task_readdir(struct file * filp, void * dirent, filldir_t filldir);
1563 static struct dentry *proc_task_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd);
1565 static struct file_operations proc_fd_operations = {
1566 .read = generic_read_dir,
1567 .readdir = proc_readfd,
1570 static struct file_operations proc_task_operations = {
1571 .read = generic_read_dir,
1572 .readdir = proc_task_readdir,
1576 * proc directories can do almost nothing..
1578 static struct inode_operations proc_fd_inode_operations = {
1579 .lookup = proc_lookupfd,
1580 .permission = proc_permission,
1583 static struct inode_operations proc_task_inode_operations = {
1584 .lookup = proc_task_lookup,
1585 .permission = proc_task_permission,
1588 #ifdef CONFIG_SECURITY
1589 static ssize_t proc_pid_attr_read(struct file * file, char __user * buf,
1590 size_t count, loff_t *ppos)
1592 struct inode * inode = file->f_dentry->d_inode;
1595 struct task_struct *task = proc_task(inode);
1597 if (count > PAGE_SIZE)
1599 if (!(page = __get_free_page(GFP_KERNEL)))
1602 length = security_getprocattr(task,
1603 (char*)file->f_dentry->d_name.name,
1604 (void*)page, count);
1606 length = simple_read_from_buffer(buf, count, ppos, (char *)page, length);
1611 static ssize_t proc_pid_attr_write(struct file * file, const char __user * buf,
1612 size_t count, loff_t *ppos)
1614 struct inode * inode = file->f_dentry->d_inode;
1617 struct task_struct *task = proc_task(inode);
1619 if (count > PAGE_SIZE)
1622 /* No partial writes. */
1625 page = (char*)__get_free_page(GFP_USER);
1629 if (copy_from_user(page, buf, count))
1632 length = security_setprocattr(task,
1633 (char*)file->f_dentry->d_name.name,
1634 (void*)page, count);
1636 free_page((unsigned long) page);
1640 static struct file_operations proc_pid_attr_operations = {
1641 .read = proc_pid_attr_read,
1642 .write = proc_pid_attr_write,
1645 static struct file_operations proc_tid_attr_operations;
1646 static struct inode_operations proc_tid_attr_inode_operations;
1647 static struct file_operations proc_tgid_attr_operations;
1648 static struct inode_operations proc_tgid_attr_inode_operations;
1651 static int get_tid_list(int index, unsigned int *tids, struct inode *dir);
1654 static struct dentry *proc_pident_lookup(struct inode *dir,
1655 struct dentry *dentry,
1656 struct pid_entry *ents)
1658 struct inode *inode;
1660 struct task_struct *task = proc_task(dir);
1661 struct pid_entry *p;
1662 struct proc_inode *ei;
1667 if (!pid_alive(task))
1670 for (p = ents; p->name; p++) {
1671 if (p->len != dentry->d_name.len)
1673 if (!memcmp(dentry->d_name.name, p->name, p->len))
1680 inode = proc_pid_make_inode(dir->i_sb, task, p->type);
1685 inode->i_mode = p->mode;
1687 * Yes, it does not scale. And it should not. Don't add
1688 * new entries into /proc/<tgid>/ without very good reasons.
1691 case PROC_TGID_TASK:
1692 inode->i_nlink = 2 + get_tid_list(2, NULL, dir);
1693 inode->i_op = &proc_task_inode_operations;
1694 inode->i_fop = &proc_task_operations;
1699 inode->i_op = &proc_fd_inode_operations;
1700 inode->i_fop = &proc_fd_operations;
1704 inode->i_op = &proc_pid_link_inode_operations;
1705 ei->op.proc_get_link = proc_exe_link;
1709 inode->i_op = &proc_pid_link_inode_operations;
1710 ei->op.proc_get_link = proc_cwd_link;
1713 case PROC_TGID_ROOT:
1714 inode->i_op = &proc_pid_link_inode_operations;
1715 ei->op.proc_get_link = proc_root_link;
1717 case PROC_TID_ENVIRON:
1718 case PROC_TGID_ENVIRON:
1719 inode->i_fop = &proc_info_file_operations;
1720 ei->op.proc_read = proc_pid_environ;
1723 case PROC_TGID_AUXV:
1724 inode->i_fop = &proc_info_file_operations;
1725 ei->op.proc_read = proc_pid_auxv;
1727 case PROC_TID_STATUS:
1728 case PROC_TGID_STATUS:
1729 inode->i_fop = &proc_info_file_operations;
1730 ei->op.proc_read = proc_pid_status;
1733 inode->i_fop = &proc_info_file_operations;
1734 ei->op.proc_read = proc_tid_stat;
1736 case PROC_TGID_STAT:
1737 inode->i_fop = &proc_info_file_operations;
1738 ei->op.proc_read = proc_tgid_stat;
1740 case PROC_TID_CMDLINE:
1741 case PROC_TGID_CMDLINE:
1742 inode->i_fop = &proc_info_file_operations;
1743 ei->op.proc_read = proc_pid_cmdline;
1745 case PROC_TID_STATM:
1746 case PROC_TGID_STATM:
1747 inode->i_fop = &proc_info_file_operations;
1748 ei->op.proc_read = proc_pid_statm;
1751 case PROC_TGID_MAPS:
1752 inode->i_fop = &proc_maps_operations;
1755 case PROC_TID_NUMA_MAPS:
1756 case PROC_TGID_NUMA_MAPS:
1757 inode->i_fop = &proc_numa_maps_operations;
1762 inode->i_op = &proc_mem_inode_operations;
1763 inode->i_fop = &proc_mem_operations;
1765 #ifdef CONFIG_SECCOMP
1766 case PROC_TID_SECCOMP:
1767 case PROC_TGID_SECCOMP:
1768 inode->i_fop = &proc_seccomp_operations;
1770 #endif /* CONFIG_SECCOMP */
1771 case PROC_TID_MOUNTS:
1772 case PROC_TGID_MOUNTS:
1773 inode->i_fop = &proc_mounts_operations;
1776 case PROC_TID_SMAPS:
1777 case PROC_TGID_SMAPS:
1778 inode->i_fop = &proc_smaps_operations;
1781 case PROC_TID_MOUNTSTATS:
1782 case PROC_TGID_MOUNTSTATS:
1783 inode->i_fop = &proc_mountstats_operations;
1785 #ifdef CONFIG_SECURITY
1788 inode->i_op = &proc_tid_attr_inode_operations;
1789 inode->i_fop = &proc_tid_attr_operations;
1791 case PROC_TGID_ATTR:
1793 inode->i_op = &proc_tgid_attr_inode_operations;
1794 inode->i_fop = &proc_tgid_attr_operations;
1796 case PROC_TID_ATTR_CURRENT:
1797 case PROC_TGID_ATTR_CURRENT:
1798 case PROC_TID_ATTR_PREV:
1799 case PROC_TGID_ATTR_PREV:
1800 case PROC_TID_ATTR_EXEC:
1801 case PROC_TGID_ATTR_EXEC:
1802 case PROC_TID_ATTR_FSCREATE:
1803 case PROC_TGID_ATTR_FSCREATE:
1804 inode->i_fop = &proc_pid_attr_operations;
1807 #ifdef CONFIG_KALLSYMS
1808 case PROC_TID_WCHAN:
1809 case PROC_TGID_WCHAN:
1810 inode->i_fop = &proc_info_file_operations;
1811 ei->op.proc_read = proc_pid_wchan;
1814 #ifdef CONFIG_SCHEDSTATS
1815 case PROC_TID_SCHEDSTAT:
1816 case PROC_TGID_SCHEDSTAT:
1817 inode->i_fop = &proc_info_file_operations;
1818 ei->op.proc_read = proc_pid_schedstat;
1821 #ifdef CONFIG_CPUSETS
1822 case PROC_TID_CPUSET:
1823 case PROC_TGID_CPUSET:
1824 inode->i_fop = &proc_cpuset_operations;
1827 case PROC_TID_OOM_SCORE:
1828 case PROC_TGID_OOM_SCORE:
1829 inode->i_fop = &proc_info_file_operations;
1830 ei->op.proc_read = proc_oom_score;
1832 case PROC_TID_OOM_ADJUST:
1833 case PROC_TGID_OOM_ADJUST:
1834 inode->i_fop = &proc_oom_adjust_operations;
1836 #ifdef CONFIG_AUDITSYSCALL
1837 case PROC_TID_LOGINUID:
1838 case PROC_TGID_LOGINUID:
1839 inode->i_fop = &proc_loginuid_operations;
1843 printk("procfs: impossible type (%d)",p->type);
1845 return ERR_PTR(-EINVAL);
1847 dentry->d_op = &pid_dentry_operations;
1848 d_add(dentry, inode);
1852 return ERR_PTR(error);
1855 static struct dentry *proc_tgid_base_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd){
1856 return proc_pident_lookup(dir, dentry, tgid_base_stuff);
1859 static struct dentry *proc_tid_base_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd){
1860 return proc_pident_lookup(dir, dentry, tid_base_stuff);
1863 static struct file_operations proc_tgid_base_operations = {
1864 .read = generic_read_dir,
1865 .readdir = proc_tgid_base_readdir,
1868 static struct file_operations proc_tid_base_operations = {
1869 .read = generic_read_dir,
1870 .readdir = proc_tid_base_readdir,
1873 static struct inode_operations proc_tgid_base_inode_operations = {
1874 .lookup = proc_tgid_base_lookup,
1877 static struct inode_operations proc_tid_base_inode_operations = {
1878 .lookup = proc_tid_base_lookup,
1881 #ifdef CONFIG_SECURITY
1882 static int proc_tgid_attr_readdir(struct file * filp,
1883 void * dirent, filldir_t filldir)
1885 return proc_pident_readdir(filp,dirent,filldir,
1886 tgid_attr_stuff,ARRAY_SIZE(tgid_attr_stuff));
1889 static int proc_tid_attr_readdir(struct file * filp,
1890 void * dirent, filldir_t filldir)
1892 return proc_pident_readdir(filp,dirent,filldir,
1893 tid_attr_stuff,ARRAY_SIZE(tid_attr_stuff));
1896 static struct file_operations proc_tgid_attr_operations = {
1897 .read = generic_read_dir,
1898 .readdir = proc_tgid_attr_readdir,
1901 static struct file_operations proc_tid_attr_operations = {
1902 .read = generic_read_dir,
1903 .readdir = proc_tid_attr_readdir,
1906 static struct dentry *proc_tgid_attr_lookup(struct inode *dir,
1907 struct dentry *dentry, struct nameidata *nd)
1909 return proc_pident_lookup(dir, dentry, tgid_attr_stuff);
1912 static struct dentry *proc_tid_attr_lookup(struct inode *dir,
1913 struct dentry *dentry, struct nameidata *nd)
1915 return proc_pident_lookup(dir, dentry, tid_attr_stuff);
1918 static struct inode_operations proc_tgid_attr_inode_operations = {
1919 .lookup = proc_tgid_attr_lookup,
1922 static struct inode_operations proc_tid_attr_inode_operations = {
1923 .lookup = proc_tid_attr_lookup,
1930 static int proc_self_readlink(struct dentry *dentry, char __user *buffer,
1934 sprintf(tmp, "%d", current->tgid);
1935 return vfs_readlink(dentry,buffer,buflen,tmp);
1938 static void *proc_self_follow_link(struct dentry *dentry, struct nameidata *nd)
1941 sprintf(tmp, "%d", current->tgid);
1942 return ERR_PTR(vfs_follow_link(nd,tmp));
1945 static struct inode_operations proc_self_inode_operations = {
1946 .readlink = proc_self_readlink,
1947 .follow_link = proc_self_follow_link,
1951 * proc_pid_unhash - Unhash /proc/@pid entry from the dcache.
1952 * @p: task that should be flushed.
1954 * Drops the /proc/@pid dcache entry from the hash chains.
1956 * Dropping /proc/@pid entries and detach_pid must be synchroneous,
1957 * otherwise e.g. /proc/@pid/exe might point to the wrong executable,
1958 * if the pid value is immediately reused. This is enforced by
1959 * - caller must acquire spin_lock(p->proc_lock)
1960 * - must be called before detach_pid()
1961 * - proc_pid_lookup acquires proc_lock, and checks that
1962 * the target is not dead by looking at the attach count
1966 struct dentry *proc_pid_unhash(struct task_struct *p)
1968 struct dentry *proc_dentry;
1970 proc_dentry = p->proc_dentry;
1971 if (proc_dentry != NULL) {
1973 spin_lock(&dcache_lock);
1974 spin_lock(&proc_dentry->d_lock);
1975 if (!d_unhashed(proc_dentry)) {
1976 dget_locked(proc_dentry);
1977 __d_drop(proc_dentry);
1978 spin_unlock(&proc_dentry->d_lock);
1980 spin_unlock(&proc_dentry->d_lock);
1983 spin_unlock(&dcache_lock);
1989 * proc_pid_flush - recover memory used by stale /proc/@pid/x entries
1990 * @proc_dentry: directoy to prune.
1992 * Shrink the /proc directory that was used by the just killed thread.
1995 void proc_pid_flush(struct dentry *proc_dentry)
1998 if(proc_dentry != NULL) {
1999 shrink_dcache_parent(proc_dentry);
2005 struct dentry *proc_pid_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd)
2007 struct task_struct *task;
2008 struct inode *inode;
2009 struct proc_inode *ei;
2013 if (dentry->d_name.len == 4 && !memcmp(dentry->d_name.name,"self",4)) {
2014 inode = new_inode(dir->i_sb);
2016 return ERR_PTR(-ENOMEM);
2018 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
2019 inode->i_ino = fake_ino(0, PROC_TGID_INO);
2021 inode->i_mode = S_IFLNK|S_IRWXUGO;
2022 inode->i_uid = inode->i_gid = 0;
2024 inode->i_op = &proc_self_inode_operations;
2025 d_add(dentry, inode);
2028 tgid = name_to_int(dentry);
2032 read_lock(&tasklist_lock);
2033 task = find_task_by_pid(tgid);
2035 get_task_struct(task);
2036 read_unlock(&tasklist_lock);
2040 inode = proc_pid_make_inode(dir->i_sb, task, PROC_TGID_INO);
2044 put_task_struct(task);
2047 inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO;
2048 inode->i_op = &proc_tgid_base_inode_operations;
2049 inode->i_fop = &proc_tgid_base_operations;
2050 inode->i_flags|=S_IMMUTABLE;
2051 #ifdef CONFIG_SECURITY
2057 dentry->d_op = &pid_base_dentry_operations;
2060 d_add(dentry, inode);
2061 spin_lock(&task->proc_lock);
2062 task->proc_dentry = dentry;
2063 if (!pid_alive(task)) {
2064 dentry = proc_pid_unhash(task);
2067 spin_unlock(&task->proc_lock);
2069 put_task_struct(task);
2071 proc_pid_flush(dentry);
2076 return ERR_PTR(-ENOENT);
2080 static struct dentry *proc_task_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd)
2082 struct task_struct *task;
2083 struct task_struct *leader = proc_task(dir);
2084 struct inode *inode;
2087 tid = name_to_int(dentry);
2091 read_lock(&tasklist_lock);
2092 task = find_task_by_pid(tid);
2094 get_task_struct(task);
2095 read_unlock(&tasklist_lock);
2098 if (leader->tgid != task->tgid)
2101 inode = proc_pid_make_inode(dir->i_sb, task, PROC_TID_INO);
2106 inode->i_mode = S_IFDIR|S_IRUGO|S_IXUGO;
2107 inode->i_op = &proc_tid_base_inode_operations;
2108 inode->i_fop = &proc_tid_base_operations;
2109 inode->i_flags|=S_IMMUTABLE;
2110 #ifdef CONFIG_SECURITY
2116 dentry->d_op = &pid_base_dentry_operations;
2118 d_add(dentry, inode);
2120 put_task_struct(task);
2123 put_task_struct(task);
2125 return ERR_PTR(-ENOENT);
2128 #define PROC_NUMBUF 10
2129 #define PROC_MAXPIDS 20
2132 * Get a few tgid's to return for filldir - we need to hold the
2133 * tasklist lock while doing this, and we must release it before
2134 * we actually do the filldir itself, so we use a temp buffer..
2136 static int get_tgid_list(int index, unsigned long version, unsigned int *tgids)
2138 struct task_struct *p;
2142 read_lock(&tasklist_lock);
2145 p = find_task_by_pid(version);
2146 if (p && !thread_group_leader(p))
2153 p = next_task(&init_task);
2155 for ( ; p != &init_task; p = next_task(p)) {
2161 tgids[nr_tgids] = tgid;
2163 if (nr_tgids >= PROC_MAXPIDS)
2166 read_unlock(&tasklist_lock);
2171 * Get a few tid's to return for filldir - we need to hold the
2172 * tasklist lock while doing this, and we must release it before
2173 * we actually do the filldir itself, so we use a temp buffer..
2175 static int get_tid_list(int index, unsigned int *tids, struct inode *dir)
2177 struct task_struct *leader_task = proc_task(dir);
2178 struct task_struct *task = leader_task;
2182 read_lock(&tasklist_lock);
2184 * The starting point task (leader_task) might be an already
2185 * unlinked task, which cannot be used to access the task-list
2186 * via next_thread().
2188 if (pid_alive(task)) do {
2189 int tid = task->pid;
2194 tids[nr_tids] = tid;
2196 if (nr_tids >= PROC_MAXPIDS)
2198 } while ((task = next_thread(task)) != leader_task);
2199 read_unlock(&tasklist_lock);
2203 /* for the /proc/ directory itself, after non-process stuff has been done */
2204 int proc_pid_readdir(struct file * filp, void * dirent, filldir_t filldir)
2206 unsigned int tgid_array[PROC_MAXPIDS];
2207 char buf[PROC_NUMBUF];
2208 unsigned int nr = filp->f_pos - FIRST_PROCESS_ENTRY;
2209 unsigned int nr_tgids, i;
2213 ino_t ino = fake_ino(0,PROC_TGID_INO);
2214 if (filldir(dirent, "self", 4, filp->f_pos, ino, DT_LNK) < 0)
2220 /* f_version caches the tgid value that the last readdir call couldn't
2221 * return. lseek aka telldir automagically resets f_version to 0.
2223 next_tgid = filp->f_version;
2224 filp->f_version = 0;
2226 nr_tgids = get_tgid_list(nr, next_tgid, tgid_array);
2228 /* no more entries ! */
2233 /* do not use the last found pid, reserve it for next_tgid */
2234 if (nr_tgids == PROC_MAXPIDS) {
2236 next_tgid = tgid_array[nr_tgids];
2239 for (i=0;i<nr_tgids;i++) {
2240 int tgid = tgid_array[i];
2241 ino_t ino = fake_ino(tgid,PROC_TGID_INO);
2242 unsigned long j = PROC_NUMBUF;
2245 buf[--j] = '0' + (tgid % 10);
2246 while ((tgid /= 10) != 0);
2248 if (filldir(dirent, buf+j, PROC_NUMBUF-j, filp->f_pos, ino, DT_DIR) < 0) {
2249 /* returning this tgid failed, save it as the first
2250 * pid for the next readir call */
2251 filp->f_version = tgid_array[i];
2262 /* for the /proc/TGID/task/ directories */
2263 static int proc_task_readdir(struct file * filp, void * dirent, filldir_t filldir)
2265 unsigned int tid_array[PROC_MAXPIDS];
2266 char buf[PROC_NUMBUF];
2267 unsigned int nr_tids, i;
2268 struct dentry *dentry = filp->f_dentry;
2269 struct inode *inode = dentry->d_inode;
2270 int retval = -ENOENT;
2272 unsigned long pos = filp->f_pos; /* avoiding "long long" filp->f_pos */
2274 if (!pid_alive(proc_task(inode)))
2281 if (filldir(dirent, ".", 1, pos, ino, DT_DIR) < 0)
2286 ino = parent_ino(dentry);
2287 if (filldir(dirent, "..", 2, pos, ino, DT_DIR) < 0)
2293 nr_tids = get_tid_list(pos, tid_array, inode);
2294 inode->i_nlink = pos + nr_tids;
2296 for (i = 0; i < nr_tids; i++) {
2297 unsigned long j = PROC_NUMBUF;
2298 int tid = tid_array[i];
2300 ino = fake_ino(tid,PROC_TID_INO);
2303 buf[--j] = '0' + (tid % 10);
2304 while ((tid /= 10) != 0);
2306 if (filldir(dirent, buf+j, PROC_NUMBUF-j, pos, ino, DT_DIR) < 0)