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/file.h>
59 #include <linux/string.h>
60 #include <linux/seq_file.h>
61 #include <linux/namei.h>
62 #include <linux/namespace.h>
64 #include <linux/smp_lock.h>
65 #include <linux/rcupdate.h>
66 #include <linux/kallsyms.h>
67 #include <linux/mount.h>
68 #include <linux/security.h>
69 #include <linux/ptrace.h>
70 #include <linux/seccomp.h>
71 #include <linux/cpuset.h>
72 #include <linux/audit.h>
76 * For hysterical raisins we keep the same inumbers as in the old procfs.
77 * Feel free to change the macro below - just keep the range distinct from
78 * inumbers of the rest of procfs (currently those are in 0x0000--0xffff).
79 * As soon as we'll get a separate superblock we will be able to forget
80 * about magical ranges too.
83 #define fake_ino(pid,ino) (((pid)<<16)|(ino))
85 enum pid_directory_inos
{
107 #ifdef CONFIG_SCHEDSTATS
110 #ifdef CONFIG_CPUSETS
113 #ifdef CONFIG_SECURITY
115 PROC_TGID_ATTR_CURRENT
,
118 PROC_TGID_ATTR_FSCREATE
,
120 #ifdef CONFIG_AUDITSYSCALL
124 PROC_TGID_OOM_ADJUST
,
128 #ifdef CONFIG_SECCOMP
145 #ifdef CONFIG_SCHEDSTATS
148 #ifdef CONFIG_CPUSETS
151 #ifdef CONFIG_SECURITY
153 PROC_TID_ATTR_CURRENT
,
156 PROC_TID_ATTR_FSCREATE
,
158 #ifdef CONFIG_AUDITSYSCALL
164 /* Add new entries before this */
165 PROC_TID_FD_DIR
= 0x8000, /* 0x8000-0xffff */
175 #define E(type,name,mode) {(type),sizeof(name)-1,(name),(mode)}
177 static struct pid_entry tgid_base_stuff
[] = {
178 E(PROC_TGID_TASK
, "task", S_IFDIR
|S_IRUGO
|S_IXUGO
),
179 E(PROC_TGID_FD
, "fd", S_IFDIR
|S_IRUSR
|S_IXUSR
),
180 E(PROC_TGID_ENVIRON
, "environ", S_IFREG
|S_IRUSR
),
181 E(PROC_TGID_AUXV
, "auxv", S_IFREG
|S_IRUSR
),
182 E(PROC_TGID_STATUS
, "status", S_IFREG
|S_IRUGO
),
183 E(PROC_TGID_CMDLINE
, "cmdline", S_IFREG
|S_IRUGO
),
184 E(PROC_TGID_STAT
, "stat", S_IFREG
|S_IRUGO
),
185 E(PROC_TGID_STATM
, "statm", S_IFREG
|S_IRUGO
),
186 E(PROC_TGID_MAPS
, "maps", S_IFREG
|S_IRUGO
),
188 E(PROC_TGID_NUMA_MAPS
, "numa_maps", S_IFREG
|S_IRUGO
),
190 E(PROC_TGID_MEM
, "mem", S_IFREG
|S_IRUSR
|S_IWUSR
),
191 #ifdef CONFIG_SECCOMP
192 E(PROC_TGID_SECCOMP
, "seccomp", S_IFREG
|S_IRUSR
|S_IWUSR
),
194 E(PROC_TGID_CWD
, "cwd", S_IFLNK
|S_IRWXUGO
),
195 E(PROC_TGID_ROOT
, "root", S_IFLNK
|S_IRWXUGO
),
196 E(PROC_TGID_EXE
, "exe", S_IFLNK
|S_IRWXUGO
),
197 E(PROC_TGID_MOUNTS
, "mounts", S_IFREG
|S_IRUGO
),
198 E(PROC_TGID_SMAPS
, "smaps", S_IFREG
|S_IRUGO
),
199 #ifdef CONFIG_SECURITY
200 E(PROC_TGID_ATTR
, "attr", S_IFDIR
|S_IRUGO
|S_IXUGO
),
202 #ifdef CONFIG_KALLSYMS
203 E(PROC_TGID_WCHAN
, "wchan", S_IFREG
|S_IRUGO
),
205 #ifdef CONFIG_SCHEDSTATS
206 E(PROC_TGID_SCHEDSTAT
, "schedstat", S_IFREG
|S_IRUGO
),
208 #ifdef CONFIG_CPUSETS
209 E(PROC_TGID_CPUSET
, "cpuset", S_IFREG
|S_IRUGO
),
211 E(PROC_TGID_OOM_SCORE
, "oom_score",S_IFREG
|S_IRUGO
),
212 E(PROC_TGID_OOM_ADJUST
,"oom_adj", S_IFREG
|S_IRUGO
|S_IWUSR
),
213 #ifdef CONFIG_AUDITSYSCALL
214 E(PROC_TGID_LOGINUID
, "loginuid", S_IFREG
|S_IWUSR
|S_IRUGO
),
218 static struct pid_entry tid_base_stuff
[] = {
219 E(PROC_TID_FD
, "fd", S_IFDIR
|S_IRUSR
|S_IXUSR
),
220 E(PROC_TID_ENVIRON
, "environ", S_IFREG
|S_IRUSR
),
221 E(PROC_TID_AUXV
, "auxv", S_IFREG
|S_IRUSR
),
222 E(PROC_TID_STATUS
, "status", S_IFREG
|S_IRUGO
),
223 E(PROC_TID_CMDLINE
, "cmdline", S_IFREG
|S_IRUGO
),
224 E(PROC_TID_STAT
, "stat", S_IFREG
|S_IRUGO
),
225 E(PROC_TID_STATM
, "statm", S_IFREG
|S_IRUGO
),
226 E(PROC_TID_MAPS
, "maps", S_IFREG
|S_IRUGO
),
228 E(PROC_TID_NUMA_MAPS
, "numa_maps", S_IFREG
|S_IRUGO
),
230 E(PROC_TID_MEM
, "mem", S_IFREG
|S_IRUSR
|S_IWUSR
),
231 #ifdef CONFIG_SECCOMP
232 E(PROC_TID_SECCOMP
, "seccomp", S_IFREG
|S_IRUSR
|S_IWUSR
),
234 E(PROC_TID_CWD
, "cwd", S_IFLNK
|S_IRWXUGO
),
235 E(PROC_TID_ROOT
, "root", S_IFLNK
|S_IRWXUGO
),
236 E(PROC_TID_EXE
, "exe", S_IFLNK
|S_IRWXUGO
),
237 E(PROC_TID_MOUNTS
, "mounts", S_IFREG
|S_IRUGO
),
238 E(PROC_TID_SMAPS
, "smaps", S_IFREG
|S_IRUGO
),
239 #ifdef CONFIG_SECURITY
240 E(PROC_TID_ATTR
, "attr", S_IFDIR
|S_IRUGO
|S_IXUGO
),
242 #ifdef CONFIG_KALLSYMS
243 E(PROC_TID_WCHAN
, "wchan", S_IFREG
|S_IRUGO
),
245 #ifdef CONFIG_SCHEDSTATS
246 E(PROC_TID_SCHEDSTAT
, "schedstat",S_IFREG
|S_IRUGO
),
248 #ifdef CONFIG_CPUSETS
249 E(PROC_TID_CPUSET
, "cpuset", S_IFREG
|S_IRUGO
),
251 E(PROC_TID_OOM_SCORE
, "oom_score",S_IFREG
|S_IRUGO
),
252 E(PROC_TID_OOM_ADJUST
, "oom_adj", S_IFREG
|S_IRUGO
|S_IWUSR
),
253 #ifdef CONFIG_AUDITSYSCALL
254 E(PROC_TID_LOGINUID
, "loginuid", S_IFREG
|S_IWUSR
|S_IRUGO
),
259 #ifdef CONFIG_SECURITY
260 static struct pid_entry tgid_attr_stuff
[] = {
261 E(PROC_TGID_ATTR_CURRENT
, "current", S_IFREG
|S_IRUGO
|S_IWUGO
),
262 E(PROC_TGID_ATTR_PREV
, "prev", S_IFREG
|S_IRUGO
),
263 E(PROC_TGID_ATTR_EXEC
, "exec", S_IFREG
|S_IRUGO
|S_IWUGO
),
264 E(PROC_TGID_ATTR_FSCREATE
, "fscreate", S_IFREG
|S_IRUGO
|S_IWUGO
),
267 static struct pid_entry tid_attr_stuff
[] = {
268 E(PROC_TID_ATTR_CURRENT
, "current", S_IFREG
|S_IRUGO
|S_IWUGO
),
269 E(PROC_TID_ATTR_PREV
, "prev", S_IFREG
|S_IRUGO
),
270 E(PROC_TID_ATTR_EXEC
, "exec", S_IFREG
|S_IRUGO
|S_IWUGO
),
271 E(PROC_TID_ATTR_FSCREATE
, "fscreate", S_IFREG
|S_IRUGO
|S_IWUGO
),
278 static int proc_fd_link(struct inode
*inode
, struct dentry
**dentry
, struct vfsmount
**mnt
)
280 struct task_struct
*task
= proc_task(inode
);
281 struct files_struct
*files
;
283 int fd
= proc_type(inode
) - PROC_TID_FD_DIR
;
285 files
= get_files_struct(task
);
288 file
= fcheck_files(files
, fd
);
290 *mnt
= mntget(file
->f_vfsmnt
);
291 *dentry
= dget(file
->f_dentry
);
293 put_files_struct(files
);
297 put_files_struct(files
);
302 static struct fs_struct
*get_fs_struct(struct task_struct
*task
)
304 struct fs_struct
*fs
;
308 atomic_inc(&fs
->count
);
313 static int proc_cwd_link(struct inode
*inode
, struct dentry
**dentry
, struct vfsmount
**mnt
)
315 struct fs_struct
*fs
= get_fs_struct(proc_task(inode
));
316 int result
= -ENOENT
;
318 read_lock(&fs
->lock
);
319 *mnt
= mntget(fs
->pwdmnt
);
320 *dentry
= dget(fs
->pwd
);
321 read_unlock(&fs
->lock
);
328 static int proc_root_link(struct inode
*inode
, struct dentry
**dentry
, struct vfsmount
**mnt
)
330 struct fs_struct
*fs
= get_fs_struct(proc_task(inode
));
331 int result
= -ENOENT
;
333 read_lock(&fs
->lock
);
334 *mnt
= mntget(fs
->rootmnt
);
335 *dentry
= dget(fs
->root
);
336 read_unlock(&fs
->lock
);
343 #define MAY_PTRACE(task) \
344 (task == current || \
345 (task->parent == current && \
346 (task->ptrace & PT_PTRACED) && \
347 (task->state == TASK_STOPPED || task->state == TASK_TRACED) && \
348 security_ptrace(current,task) == 0))
350 static int proc_pid_environ(struct task_struct
*task
, char * buffer
)
353 struct mm_struct
*mm
= get_task_mm(task
);
355 unsigned int len
= mm
->env_end
- mm
->env_start
;
358 res
= access_process_vm(task
, mm
->env_start
, buffer
, len
, 0);
359 if (!ptrace_may_attach(task
))
366 static int proc_pid_cmdline(struct task_struct
*task
, char * buffer
)
370 struct mm_struct
*mm
= get_task_mm(task
);
374 goto out_mm
; /* Shh! No looking before we're done */
376 len
= mm
->arg_end
- mm
->arg_start
;
381 res
= access_process_vm(task
, mm
->arg_start
, buffer
, len
, 0);
383 // If the nul at the end of args has been overwritten, then
384 // assume application is using setproctitle(3).
385 if (res
> 0 && buffer
[res
-1] != '\0' && len
< PAGE_SIZE
) {
386 len
= strnlen(buffer
, res
);
390 len
= mm
->env_end
- mm
->env_start
;
391 if (len
> PAGE_SIZE
- res
)
392 len
= PAGE_SIZE
- res
;
393 res
+= access_process_vm(task
, mm
->env_start
, buffer
+res
, len
, 0);
394 res
= strnlen(buffer
, res
);
403 static int proc_pid_auxv(struct task_struct
*task
, char *buffer
)
406 struct mm_struct
*mm
= get_task_mm(task
);
408 unsigned int nwords
= 0;
411 while (mm
->saved_auxv
[nwords
- 2] != 0); /* AT_NULL */
412 res
= nwords
* sizeof(mm
->saved_auxv
[0]);
415 memcpy(buffer
, mm
->saved_auxv
, res
);
422 #ifdef CONFIG_KALLSYMS
424 * Provides a wchan file via kallsyms in a proper one-value-per-file format.
425 * Returns the resolved symbol. If that fails, simply return the address.
427 static int proc_pid_wchan(struct task_struct
*task
, char *buffer
)
430 const char *sym_name
;
431 unsigned long wchan
, size
, offset
;
432 char namebuf
[KSYM_NAME_LEN
+1];
434 wchan
= get_wchan(task
);
436 sym_name
= kallsyms_lookup(wchan
, &size
, &offset
, &modname
, namebuf
);
438 return sprintf(buffer
, "%s", sym_name
);
439 return sprintf(buffer
, "%lu", wchan
);
441 #endif /* CONFIG_KALLSYMS */
443 #ifdef CONFIG_SCHEDSTATS
445 * Provides /proc/PID/schedstat
447 static int proc_pid_schedstat(struct task_struct
*task
, char *buffer
)
449 return sprintf(buffer
, "%lu %lu %lu\n",
450 task
->sched_info
.cpu_time
,
451 task
->sched_info
.run_delay
,
452 task
->sched_info
.pcnt
);
456 /* The badness from the OOM killer */
457 unsigned long badness(struct task_struct
*p
, unsigned long uptime
);
458 static int proc_oom_score(struct task_struct
*task
, char *buffer
)
460 unsigned long points
;
461 struct timespec uptime
;
463 do_posix_clock_monotonic_gettime(&uptime
);
464 points
= badness(task
, uptime
.tv_sec
);
465 return sprintf(buffer
, "%lu\n", points
);
468 /************************************************************************/
469 /* Here the fs part begins */
470 /************************************************************************/
472 /* permission checks */
474 static int proc_check_root(struct inode
*inode
)
476 struct dentry
*de
, *base
, *root
;
477 struct vfsmount
*our_vfsmnt
, *vfsmnt
, *mnt
;
480 if (proc_root_link(inode
, &root
, &vfsmnt
)) /* Ewww... */
482 read_lock(¤t
->fs
->lock
);
483 our_vfsmnt
= mntget(current
->fs
->rootmnt
);
484 base
= dget(current
->fs
->root
);
485 read_unlock(¤t
->fs
->lock
);
487 spin_lock(&vfsmount_lock
);
491 while (vfsmnt
!= our_vfsmnt
) {
492 if (vfsmnt
== vfsmnt
->mnt_parent
)
494 de
= vfsmnt
->mnt_mountpoint
;
495 vfsmnt
= vfsmnt
->mnt_parent
;
498 if (!is_subdir(de
, base
))
500 spin_unlock(&vfsmount_lock
);
509 spin_unlock(&vfsmount_lock
);
514 static int proc_permission(struct inode
*inode
, int mask
, struct nameidata
*nd
)
516 if (generic_permission(inode
, mask
, NULL
) != 0)
518 return proc_check_root(inode
);
521 extern struct seq_operations proc_pid_maps_op
;
522 static int maps_open(struct inode
*inode
, struct file
*file
)
524 struct task_struct
*task
= proc_task(inode
);
525 int ret
= seq_open(file
, &proc_pid_maps_op
);
527 struct seq_file
*m
= file
->private_data
;
533 static struct file_operations proc_maps_operations
= {
537 .release
= seq_release
,
541 extern struct seq_operations proc_pid_numa_maps_op
;
542 static int numa_maps_open(struct inode
*inode
, struct file
*file
)
544 struct task_struct
*task
= proc_task(inode
);
545 int ret
= seq_open(file
, &proc_pid_numa_maps_op
);
547 struct seq_file
*m
= file
->private_data
;
553 static struct file_operations proc_numa_maps_operations
= {
554 .open
= numa_maps_open
,
557 .release
= seq_release
,
561 extern struct seq_operations proc_pid_smaps_op
;
562 static int smaps_open(struct inode
*inode
, struct file
*file
)
564 struct task_struct
*task
= proc_task(inode
);
565 int ret
= seq_open(file
, &proc_pid_smaps_op
);
567 struct seq_file
*m
= file
->private_data
;
573 static struct file_operations proc_smaps_operations
= {
577 .release
= seq_release
,
580 extern struct seq_operations mounts_op
;
581 static int mounts_open(struct inode
*inode
, struct file
*file
)
583 struct task_struct
*task
= proc_task(inode
);
584 int ret
= seq_open(file
, &mounts_op
);
587 struct seq_file
*m
= file
->private_data
;
588 struct namespace *namespace;
590 namespace = task
->namespace;
592 get_namespace(namespace);
596 m
->private = namespace;
598 seq_release(inode
, file
);
605 static int mounts_release(struct inode
*inode
, struct file
*file
)
607 struct seq_file
*m
= file
->private_data
;
608 struct namespace *namespace = m
->private;
609 put_namespace(namespace);
610 return seq_release(inode
, file
);
613 static struct file_operations proc_mounts_operations
= {
617 .release
= mounts_release
,
620 #define PROC_BLOCK_SIZE (3*1024) /* 4K page size but our output routines use some slack for overruns */
622 static ssize_t
proc_info_read(struct file
* file
, char __user
* buf
,
623 size_t count
, loff_t
*ppos
)
625 struct inode
* inode
= file
->f_dentry
->d_inode
;
628 struct task_struct
*task
= proc_task(inode
);
630 if (count
> PROC_BLOCK_SIZE
)
631 count
= PROC_BLOCK_SIZE
;
632 if (!(page
= __get_free_page(GFP_KERNEL
)))
635 length
= PROC_I(inode
)->op
.proc_read(task
, (char*)page
);
638 length
= simple_read_from_buffer(buf
, count
, ppos
, (char *)page
, length
);
643 static struct file_operations proc_info_file_operations
= {
644 .read
= proc_info_read
,
647 static int mem_open(struct inode
* inode
, struct file
* file
)
649 file
->private_data
= (void*)((long)current
->self_exec_id
);
653 static ssize_t
mem_read(struct file
* file
, char __user
* buf
,
654 size_t count
, loff_t
*ppos
)
656 struct task_struct
*task
= proc_task(file
->f_dentry
->d_inode
);
658 unsigned long src
= *ppos
;
660 struct mm_struct
*mm
;
662 if (!MAY_PTRACE(task
) || !ptrace_may_attach(task
))
666 page
= (char *)__get_free_page(GFP_USER
);
672 mm
= get_task_mm(task
);
678 if (file
->private_data
!= (void*)((long)current
->self_exec_id
))
684 int this_len
, retval
;
686 this_len
= (count
> PAGE_SIZE
) ? PAGE_SIZE
: count
;
687 retval
= access_process_vm(task
, src
, page
, this_len
, 0);
688 if (!retval
|| !MAY_PTRACE(task
) || !ptrace_may_attach(task
)) {
694 if (copy_to_user(buf
, page
, retval
)) {
709 free_page((unsigned long) page
);
714 #define mem_write NULL
717 /* This is a security hazard */
718 static ssize_t
mem_write(struct file
* file
, const char * buf
,
719 size_t count
, loff_t
*ppos
)
723 struct task_struct
*task
= proc_task(file
->f_dentry
->d_inode
);
724 unsigned long dst
= *ppos
;
726 if (!MAY_PTRACE(task
) || !ptrace_may_attach(task
))
729 page
= (char *)__get_free_page(GFP_USER
);
734 int this_len
, retval
;
736 this_len
= (count
> PAGE_SIZE
) ? PAGE_SIZE
: count
;
737 if (copy_from_user(page
, buf
, this_len
)) {
741 retval
= access_process_vm(task
, dst
, page
, this_len
, 1);
753 free_page((unsigned long) page
);
758 static loff_t
mem_lseek(struct file
* file
, loff_t offset
, int orig
)
762 file
->f_pos
= offset
;
765 file
->f_pos
+= offset
;
770 force_successful_syscall_return();
774 static struct file_operations proc_mem_operations
= {
781 static ssize_t
oom_adjust_read(struct file
*file
, char __user
*buf
,
782 size_t count
, loff_t
*ppos
)
784 struct task_struct
*task
= proc_task(file
->f_dentry
->d_inode
);
787 int oom_adjust
= task
->oomkilladj
;
788 loff_t __ppos
= *ppos
;
790 len
= sprintf(buffer
, "%i\n", oom_adjust
);
793 if (count
> len
-__ppos
)
795 if (copy_to_user(buf
, buffer
+ __ppos
, count
))
797 *ppos
= __ppos
+ count
;
801 static ssize_t
oom_adjust_write(struct file
*file
, const char __user
*buf
,
802 size_t count
, loff_t
*ppos
)
804 struct task_struct
*task
= proc_task(file
->f_dentry
->d_inode
);
805 char buffer
[8], *end
;
808 if (!capable(CAP_SYS_RESOURCE
))
810 memset(buffer
, 0, 8);
813 if (copy_from_user(buffer
, buf
, count
))
815 oom_adjust
= simple_strtol(buffer
, &end
, 0);
816 if ((oom_adjust
< -16 || oom_adjust
> 15) && oom_adjust
!= OOM_DISABLE
)
820 task
->oomkilladj
= oom_adjust
;
821 if (end
- buffer
== 0)
826 static struct file_operations proc_oom_adjust_operations
= {
827 .read
= oom_adjust_read
,
828 .write
= oom_adjust_write
,
831 static struct inode_operations proc_mem_inode_operations
= {
832 .permission
= proc_permission
,
835 #ifdef CONFIG_AUDITSYSCALL
837 static ssize_t
proc_loginuid_read(struct file
* file
, char __user
* buf
,
838 size_t count
, loff_t
*ppos
)
840 struct inode
* inode
= file
->f_dentry
->d_inode
;
841 struct task_struct
*task
= proc_task(inode
);
843 char tmpbuf
[TMPBUFLEN
];
845 length
= scnprintf(tmpbuf
, TMPBUFLEN
, "%u",
846 audit_get_loginuid(task
->audit_context
));
847 return simple_read_from_buffer(buf
, count
, ppos
, tmpbuf
, length
);
850 static ssize_t
proc_loginuid_write(struct file
* file
, const char __user
* buf
,
851 size_t count
, loff_t
*ppos
)
853 struct inode
* inode
= file
->f_dentry
->d_inode
;
856 struct task_struct
*task
= proc_task(inode
);
859 if (!capable(CAP_AUDIT_CONTROL
))
865 if (count
> PAGE_SIZE
)
869 /* No partial writes. */
872 page
= (char*)__get_free_page(GFP_USER
);
876 if (copy_from_user(page
, buf
, count
))
879 loginuid
= simple_strtoul(page
, &tmp
, 10);
885 length
= audit_set_loginuid(task
, loginuid
);
886 if (likely(length
== 0))
890 free_page((unsigned long) page
);
894 static struct file_operations proc_loginuid_operations
= {
895 .read
= proc_loginuid_read
,
896 .write
= proc_loginuid_write
,
900 #ifdef CONFIG_SECCOMP
901 static ssize_t
seccomp_read(struct file
*file
, char __user
*buf
,
902 size_t count
, loff_t
*ppos
)
904 struct task_struct
*tsk
= proc_task(file
->f_dentry
->d_inode
);
906 loff_t __ppos
= *ppos
;
909 /* no need to print the trailing zero, so use only len */
910 len
= sprintf(__buf
, "%u\n", tsk
->seccomp
.mode
);
913 if (count
> len
- __ppos
)
914 count
= len
- __ppos
;
915 if (copy_to_user(buf
, __buf
+ __ppos
, count
))
917 *ppos
= __ppos
+ count
;
921 static ssize_t
seccomp_write(struct file
*file
, const char __user
*buf
,
922 size_t count
, loff_t
*ppos
)
924 struct task_struct
*tsk
= proc_task(file
->f_dentry
->d_inode
);
925 char __buf
[20], *end
;
926 unsigned int seccomp_mode
;
928 /* can set it only once to be even more secure */
929 if (unlikely(tsk
->seccomp
.mode
))
932 memset(__buf
, 0, sizeof(__buf
));
933 count
= min(count
, sizeof(__buf
) - 1);
934 if (copy_from_user(__buf
, buf
, count
))
936 seccomp_mode
= simple_strtoul(__buf
, &end
, 0);
939 if (seccomp_mode
&& seccomp_mode
<= NR_SECCOMP_MODES
) {
940 tsk
->seccomp
.mode
= seccomp_mode
;
941 set_tsk_thread_flag(tsk
, TIF_SECCOMP
);
944 if (unlikely(!(end
- __buf
)))
949 static struct file_operations proc_seccomp_operations
= {
950 .read
= seccomp_read
,
951 .write
= seccomp_write
,
953 #endif /* CONFIG_SECCOMP */
955 static void *proc_pid_follow_link(struct dentry
*dentry
, struct nameidata
*nd
)
957 struct inode
*inode
= dentry
->d_inode
;
960 /* We don't need a base pointer in the /proc filesystem */
963 if (current
->fsuid
!= inode
->i_uid
&& !capable(CAP_DAC_OVERRIDE
))
965 error
= proc_check_root(inode
);
969 error
= PROC_I(inode
)->op
.proc_get_link(inode
, &nd
->dentry
, &nd
->mnt
);
970 nd
->last_type
= LAST_BIND
;
972 return ERR_PTR(error
);
975 static int do_proc_readlink(struct dentry
*dentry
, struct vfsmount
*mnt
,
976 char __user
*buffer
, int buflen
)
978 struct inode
* inode
;
979 char *tmp
= (char*)__get_free_page(GFP_KERNEL
), *path
;
985 inode
= dentry
->d_inode
;
986 path
= d_path(dentry
, mnt
, tmp
, PAGE_SIZE
);
990 len
= tmp
+ PAGE_SIZE
- 1 - path
;
994 if (copy_to_user(buffer
, path
, len
))
997 free_page((unsigned long)tmp
);
1001 static int proc_pid_readlink(struct dentry
* dentry
, char __user
* buffer
, int buflen
)
1003 int error
= -EACCES
;
1004 struct inode
*inode
= dentry
->d_inode
;
1006 struct vfsmount
*mnt
= NULL
;
1010 if (current
->fsuid
!= inode
->i_uid
&& !capable(CAP_DAC_OVERRIDE
))
1012 error
= proc_check_root(inode
);
1016 error
= PROC_I(inode
)->op
.proc_get_link(inode
, &de
, &mnt
);
1020 error
= do_proc_readlink(de
, mnt
, buffer
, buflen
);
1028 static struct inode_operations proc_pid_link_inode_operations
= {
1029 .readlink
= proc_pid_readlink
,
1030 .follow_link
= proc_pid_follow_link
1035 static int proc_readfd(struct file
* filp
, void * dirent
, filldir_t filldir
)
1037 struct inode
*inode
= filp
->f_dentry
->d_inode
;
1038 struct task_struct
*p
= proc_task(inode
);
1039 unsigned int fd
, tid
, ino
;
1042 struct files_struct
* files
;
1043 struct fdtable
*fdt
;
1054 if (filldir(dirent
, ".", 1, 0, inode
->i_ino
, DT_DIR
) < 0)
1058 ino
= fake_ino(tid
, PROC_TID_INO
);
1059 if (filldir(dirent
, "..", 2, 1, ino
, DT_DIR
) < 0)
1063 files
= get_files_struct(p
);
1067 fdt
= files_fdtable(files
);
1068 for (fd
= filp
->f_pos
-2;
1070 fd
++, filp
->f_pos
++) {
1073 if (!fcheck_files(files
, fd
))
1081 buf
[j
] = '0' + (i
% 10);
1085 ino
= fake_ino(tid
, PROC_TID_FD_DIR
+ fd
);
1086 if (filldir(dirent
, buf
+j
, NUMBUF
-j
, fd
+2, ino
, DT_LNK
) < 0) {
1093 put_files_struct(files
);
1099 static int proc_pident_readdir(struct file
*filp
,
1100 void *dirent
, filldir_t filldir
,
1101 struct pid_entry
*ents
, unsigned int nents
)
1105 struct dentry
*dentry
= filp
->f_dentry
;
1106 struct inode
*inode
= dentry
->d_inode
;
1107 struct pid_entry
*p
;
1112 if (!pid_alive(proc_task(inode
)))
1116 pid
= proc_task(inode
)->pid
;
1121 if (filldir(dirent
, ".", 1, i
, ino
, DT_DIR
) < 0)
1127 ino
= parent_ino(dentry
);
1128 if (filldir(dirent
, "..", 2, i
, ino
, DT_DIR
) < 0)
1141 if (filldir(dirent
, p
->name
, p
->len
, filp
->f_pos
,
1142 fake_ino(pid
, p
->type
), p
->mode
>> 12) < 0)
1154 static int proc_tgid_base_readdir(struct file
* filp
,
1155 void * dirent
, filldir_t filldir
)
1157 return proc_pident_readdir(filp
,dirent
,filldir
,
1158 tgid_base_stuff
,ARRAY_SIZE(tgid_base_stuff
));
1161 static int proc_tid_base_readdir(struct file
* filp
,
1162 void * dirent
, filldir_t filldir
)
1164 return proc_pident_readdir(filp
,dirent
,filldir
,
1165 tid_base_stuff
,ARRAY_SIZE(tid_base_stuff
));
1168 /* building an inode */
1170 static int task_dumpable(struct task_struct
*task
)
1173 struct mm_struct
*mm
;
1178 dumpable
= mm
->dumpable
;
1186 static struct inode
*proc_pid_make_inode(struct super_block
* sb
, struct task_struct
*task
, int ino
)
1188 struct inode
* inode
;
1189 struct proc_inode
*ei
;
1191 /* We need a new inode */
1193 inode
= new_inode(sb
);
1200 inode
->i_mtime
= inode
->i_atime
= inode
->i_ctime
= CURRENT_TIME
;
1201 inode
->i_ino
= fake_ino(task
->pid
, ino
);
1203 if (!pid_alive(task
))
1207 * grab the reference to task.
1209 get_task_struct(task
);
1214 if (ino
== PROC_TGID_INO
|| ino
== PROC_TID_INO
|| task_dumpable(task
)) {
1215 inode
->i_uid
= task
->euid
;
1216 inode
->i_gid
= task
->egid
;
1218 security_task_to_inode(task
, inode
);
1232 * Exceptional case: normally we are not allowed to unhash a busy
1233 * directory. In this case, however, we can do it - no aliasing problems
1234 * due to the way we treat inodes.
1236 * Rewrite the inode's ownerships here because the owning task may have
1237 * performed a setuid(), etc.
1239 static int pid_revalidate(struct dentry
*dentry
, struct nameidata
*nd
)
1241 struct inode
*inode
= dentry
->d_inode
;
1242 struct task_struct
*task
= proc_task(inode
);
1243 if (pid_alive(task
)) {
1244 if (proc_type(inode
) == PROC_TGID_INO
|| proc_type(inode
) == PROC_TID_INO
|| task_dumpable(task
)) {
1245 inode
->i_uid
= task
->euid
;
1246 inode
->i_gid
= task
->egid
;
1251 security_task_to_inode(task
, inode
);
1258 static int tid_fd_revalidate(struct dentry
*dentry
, struct nameidata
*nd
)
1260 struct inode
*inode
= dentry
->d_inode
;
1261 struct task_struct
*task
= proc_task(inode
);
1262 int fd
= proc_type(inode
) - PROC_TID_FD_DIR
;
1263 struct files_struct
*files
;
1265 files
= get_files_struct(task
);
1268 if (fcheck_files(files
, fd
)) {
1270 put_files_struct(files
);
1271 if (task_dumpable(task
)) {
1272 inode
->i_uid
= task
->euid
;
1273 inode
->i_gid
= task
->egid
;
1278 security_task_to_inode(task
, inode
);
1282 put_files_struct(files
);
1288 static void pid_base_iput(struct dentry
*dentry
, struct inode
*inode
)
1290 struct task_struct
*task
= proc_task(inode
);
1291 spin_lock(&task
->proc_lock
);
1292 if (task
->proc_dentry
== dentry
)
1293 task
->proc_dentry
= NULL
;
1294 spin_unlock(&task
->proc_lock
);
1298 static int pid_delete_dentry(struct dentry
* dentry
)
1300 /* Is the task we represent dead?
1301 * If so, then don't put the dentry on the lru list,
1302 * kill it immediately.
1304 return !pid_alive(proc_task(dentry
->d_inode
));
1307 static struct dentry_operations tid_fd_dentry_operations
=
1309 .d_revalidate
= tid_fd_revalidate
,
1310 .d_delete
= pid_delete_dentry
,
1313 static struct dentry_operations pid_dentry_operations
=
1315 .d_revalidate
= pid_revalidate
,
1316 .d_delete
= pid_delete_dentry
,
1319 static struct dentry_operations pid_base_dentry_operations
=
1321 .d_revalidate
= pid_revalidate
,
1322 .d_iput
= pid_base_iput
,
1323 .d_delete
= pid_delete_dentry
,
1328 static unsigned name_to_int(struct dentry
*dentry
)
1330 const char *name
= dentry
->d_name
.name
;
1331 int len
= dentry
->d_name
.len
;
1334 if (len
> 1 && *name
== '0')
1337 unsigned c
= *name
++ - '0';
1340 if (n
>= (~0U-9)/10)
1351 static struct dentry
*proc_lookupfd(struct inode
* dir
, struct dentry
* dentry
, struct nameidata
*nd
)
1353 struct task_struct
*task
= proc_task(dir
);
1354 unsigned fd
= name_to_int(dentry
);
1356 struct files_struct
* files
;
1357 struct inode
*inode
;
1358 struct proc_inode
*ei
;
1362 if (!pid_alive(task
))
1365 inode
= proc_pid_make_inode(dir
->i_sb
, task
, PROC_TID_FD_DIR
+fd
);
1369 files
= get_files_struct(task
);
1372 inode
->i_mode
= S_IFLNK
;
1374 file
= fcheck_files(files
, fd
);
1377 if (file
->f_mode
& 1)
1378 inode
->i_mode
|= S_IRUSR
| S_IXUSR
;
1379 if (file
->f_mode
& 2)
1380 inode
->i_mode
|= S_IWUSR
| S_IXUSR
;
1382 put_files_struct(files
);
1383 inode
->i_op
= &proc_pid_link_inode_operations
;
1385 ei
->op
.proc_get_link
= proc_fd_link
;
1386 dentry
->d_op
= &tid_fd_dentry_operations
;
1387 d_add(dentry
, inode
);
1392 put_files_struct(files
);
1396 return ERR_PTR(-ENOENT
);
1399 static int proc_task_readdir(struct file
* filp
, void * dirent
, filldir_t filldir
);
1400 static struct dentry
*proc_task_lookup(struct inode
*dir
, struct dentry
* dentry
, struct nameidata
*nd
);
1402 static struct file_operations proc_fd_operations
= {
1403 .read
= generic_read_dir
,
1404 .readdir
= proc_readfd
,
1407 static struct file_operations proc_task_operations
= {
1408 .read
= generic_read_dir
,
1409 .readdir
= proc_task_readdir
,
1413 * proc directories can do almost nothing..
1415 static struct inode_operations proc_fd_inode_operations
= {
1416 .lookup
= proc_lookupfd
,
1417 .permission
= proc_permission
,
1420 static struct inode_operations proc_task_inode_operations
= {
1421 .lookup
= proc_task_lookup
,
1422 .permission
= proc_permission
,
1425 #ifdef CONFIG_SECURITY
1426 static ssize_t
proc_pid_attr_read(struct file
* file
, char __user
* buf
,
1427 size_t count
, loff_t
*ppos
)
1429 struct inode
* inode
= file
->f_dentry
->d_inode
;
1432 struct task_struct
*task
= proc_task(inode
);
1434 if (count
> PAGE_SIZE
)
1436 if (!(page
= __get_free_page(GFP_KERNEL
)))
1439 length
= security_getprocattr(task
,
1440 (char*)file
->f_dentry
->d_name
.name
,
1441 (void*)page
, count
);
1443 length
= simple_read_from_buffer(buf
, count
, ppos
, (char *)page
, length
);
1448 static ssize_t
proc_pid_attr_write(struct file
* file
, const char __user
* buf
,
1449 size_t count
, loff_t
*ppos
)
1451 struct inode
* inode
= file
->f_dentry
->d_inode
;
1454 struct task_struct
*task
= proc_task(inode
);
1456 if (count
> PAGE_SIZE
)
1459 /* No partial writes. */
1462 page
= (char*)__get_free_page(GFP_USER
);
1466 if (copy_from_user(page
, buf
, count
))
1469 length
= security_setprocattr(task
,
1470 (char*)file
->f_dentry
->d_name
.name
,
1471 (void*)page
, count
);
1473 free_page((unsigned long) page
);
1477 static struct file_operations proc_pid_attr_operations
= {
1478 .read
= proc_pid_attr_read
,
1479 .write
= proc_pid_attr_write
,
1482 static struct file_operations proc_tid_attr_operations
;
1483 static struct inode_operations proc_tid_attr_inode_operations
;
1484 static struct file_operations proc_tgid_attr_operations
;
1485 static struct inode_operations proc_tgid_attr_inode_operations
;
1488 static int get_tid_list(int index
, unsigned int *tids
, struct inode
*dir
);
1491 static struct dentry
*proc_pident_lookup(struct inode
*dir
,
1492 struct dentry
*dentry
,
1493 struct pid_entry
*ents
)
1495 struct inode
*inode
;
1497 struct task_struct
*task
= proc_task(dir
);
1498 struct pid_entry
*p
;
1499 struct proc_inode
*ei
;
1504 if (!pid_alive(task
))
1507 for (p
= ents
; p
->name
; p
++) {
1508 if (p
->len
!= dentry
->d_name
.len
)
1510 if (!memcmp(dentry
->d_name
.name
, p
->name
, p
->len
))
1517 inode
= proc_pid_make_inode(dir
->i_sb
, task
, p
->type
);
1522 inode
->i_mode
= p
->mode
;
1524 * Yes, it does not scale. And it should not. Don't add
1525 * new entries into /proc/<tgid>/ without very good reasons.
1528 case PROC_TGID_TASK
:
1529 inode
->i_nlink
= 2 + get_tid_list(2, NULL
, dir
);
1530 inode
->i_op
= &proc_task_inode_operations
;
1531 inode
->i_fop
= &proc_task_operations
;
1536 inode
->i_op
= &proc_fd_inode_operations
;
1537 inode
->i_fop
= &proc_fd_operations
;
1541 inode
->i_op
= &proc_pid_link_inode_operations
;
1542 ei
->op
.proc_get_link
= proc_exe_link
;
1546 inode
->i_op
= &proc_pid_link_inode_operations
;
1547 ei
->op
.proc_get_link
= proc_cwd_link
;
1550 case PROC_TGID_ROOT
:
1551 inode
->i_op
= &proc_pid_link_inode_operations
;
1552 ei
->op
.proc_get_link
= proc_root_link
;
1554 case PROC_TID_ENVIRON
:
1555 case PROC_TGID_ENVIRON
:
1556 inode
->i_fop
= &proc_info_file_operations
;
1557 ei
->op
.proc_read
= proc_pid_environ
;
1560 case PROC_TGID_AUXV
:
1561 inode
->i_fop
= &proc_info_file_operations
;
1562 ei
->op
.proc_read
= proc_pid_auxv
;
1564 case PROC_TID_STATUS
:
1565 case PROC_TGID_STATUS
:
1566 inode
->i_fop
= &proc_info_file_operations
;
1567 ei
->op
.proc_read
= proc_pid_status
;
1570 inode
->i_fop
= &proc_info_file_operations
;
1571 ei
->op
.proc_read
= proc_tid_stat
;
1573 case PROC_TGID_STAT
:
1574 inode
->i_fop
= &proc_info_file_operations
;
1575 ei
->op
.proc_read
= proc_tgid_stat
;
1577 case PROC_TID_CMDLINE
:
1578 case PROC_TGID_CMDLINE
:
1579 inode
->i_fop
= &proc_info_file_operations
;
1580 ei
->op
.proc_read
= proc_pid_cmdline
;
1582 case PROC_TID_STATM
:
1583 case PROC_TGID_STATM
:
1584 inode
->i_fop
= &proc_info_file_operations
;
1585 ei
->op
.proc_read
= proc_pid_statm
;
1588 case PROC_TGID_MAPS
:
1589 inode
->i_fop
= &proc_maps_operations
;
1592 case PROC_TID_NUMA_MAPS
:
1593 case PROC_TGID_NUMA_MAPS
:
1594 inode
->i_fop
= &proc_numa_maps_operations
;
1599 inode
->i_op
= &proc_mem_inode_operations
;
1600 inode
->i_fop
= &proc_mem_operations
;
1602 #ifdef CONFIG_SECCOMP
1603 case PROC_TID_SECCOMP
:
1604 case PROC_TGID_SECCOMP
:
1605 inode
->i_fop
= &proc_seccomp_operations
;
1607 #endif /* CONFIG_SECCOMP */
1608 case PROC_TID_MOUNTS
:
1609 case PROC_TGID_MOUNTS
:
1610 inode
->i_fop
= &proc_mounts_operations
;
1612 case PROC_TID_SMAPS
:
1613 case PROC_TGID_SMAPS
:
1614 inode
->i_fop
= &proc_smaps_operations
;
1616 #ifdef CONFIG_SECURITY
1619 inode
->i_op
= &proc_tid_attr_inode_operations
;
1620 inode
->i_fop
= &proc_tid_attr_operations
;
1622 case PROC_TGID_ATTR
:
1624 inode
->i_op
= &proc_tgid_attr_inode_operations
;
1625 inode
->i_fop
= &proc_tgid_attr_operations
;
1627 case PROC_TID_ATTR_CURRENT
:
1628 case PROC_TGID_ATTR_CURRENT
:
1629 case PROC_TID_ATTR_PREV
:
1630 case PROC_TGID_ATTR_PREV
:
1631 case PROC_TID_ATTR_EXEC
:
1632 case PROC_TGID_ATTR_EXEC
:
1633 case PROC_TID_ATTR_FSCREATE
:
1634 case PROC_TGID_ATTR_FSCREATE
:
1635 inode
->i_fop
= &proc_pid_attr_operations
;
1638 #ifdef CONFIG_KALLSYMS
1639 case PROC_TID_WCHAN
:
1640 case PROC_TGID_WCHAN
:
1641 inode
->i_fop
= &proc_info_file_operations
;
1642 ei
->op
.proc_read
= proc_pid_wchan
;
1645 #ifdef CONFIG_SCHEDSTATS
1646 case PROC_TID_SCHEDSTAT
:
1647 case PROC_TGID_SCHEDSTAT
:
1648 inode
->i_fop
= &proc_info_file_operations
;
1649 ei
->op
.proc_read
= proc_pid_schedstat
;
1652 #ifdef CONFIG_CPUSETS
1653 case PROC_TID_CPUSET
:
1654 case PROC_TGID_CPUSET
:
1655 inode
->i_fop
= &proc_cpuset_operations
;
1658 case PROC_TID_OOM_SCORE
:
1659 case PROC_TGID_OOM_SCORE
:
1660 inode
->i_fop
= &proc_info_file_operations
;
1661 ei
->op
.proc_read
= proc_oom_score
;
1663 case PROC_TID_OOM_ADJUST
:
1664 case PROC_TGID_OOM_ADJUST
:
1665 inode
->i_fop
= &proc_oom_adjust_operations
;
1667 #ifdef CONFIG_AUDITSYSCALL
1668 case PROC_TID_LOGINUID
:
1669 case PROC_TGID_LOGINUID
:
1670 inode
->i_fop
= &proc_loginuid_operations
;
1674 printk("procfs: impossible type (%d)",p
->type
);
1676 return ERR_PTR(-EINVAL
);
1678 dentry
->d_op
= &pid_dentry_operations
;
1679 d_add(dentry
, inode
);
1683 return ERR_PTR(error
);
1686 static struct dentry
*proc_tgid_base_lookup(struct inode
*dir
, struct dentry
*dentry
, struct nameidata
*nd
){
1687 return proc_pident_lookup(dir
, dentry
, tgid_base_stuff
);
1690 static struct dentry
*proc_tid_base_lookup(struct inode
*dir
, struct dentry
*dentry
, struct nameidata
*nd
){
1691 return proc_pident_lookup(dir
, dentry
, tid_base_stuff
);
1694 static struct file_operations proc_tgid_base_operations
= {
1695 .read
= generic_read_dir
,
1696 .readdir
= proc_tgid_base_readdir
,
1699 static struct file_operations proc_tid_base_operations
= {
1700 .read
= generic_read_dir
,
1701 .readdir
= proc_tid_base_readdir
,
1704 static struct inode_operations proc_tgid_base_inode_operations
= {
1705 .lookup
= proc_tgid_base_lookup
,
1708 static struct inode_operations proc_tid_base_inode_operations
= {
1709 .lookup
= proc_tid_base_lookup
,
1712 #ifdef CONFIG_SECURITY
1713 static int proc_tgid_attr_readdir(struct file
* filp
,
1714 void * dirent
, filldir_t filldir
)
1716 return proc_pident_readdir(filp
,dirent
,filldir
,
1717 tgid_attr_stuff
,ARRAY_SIZE(tgid_attr_stuff
));
1720 static int proc_tid_attr_readdir(struct file
* filp
,
1721 void * dirent
, filldir_t filldir
)
1723 return proc_pident_readdir(filp
,dirent
,filldir
,
1724 tid_attr_stuff
,ARRAY_SIZE(tid_attr_stuff
));
1727 static struct file_operations proc_tgid_attr_operations
= {
1728 .read
= generic_read_dir
,
1729 .readdir
= proc_tgid_attr_readdir
,
1732 static struct file_operations proc_tid_attr_operations
= {
1733 .read
= generic_read_dir
,
1734 .readdir
= proc_tid_attr_readdir
,
1737 static struct dentry
*proc_tgid_attr_lookup(struct inode
*dir
,
1738 struct dentry
*dentry
, struct nameidata
*nd
)
1740 return proc_pident_lookup(dir
, dentry
, tgid_attr_stuff
);
1743 static struct dentry
*proc_tid_attr_lookup(struct inode
*dir
,
1744 struct dentry
*dentry
, struct nameidata
*nd
)
1746 return proc_pident_lookup(dir
, dentry
, tid_attr_stuff
);
1749 static struct inode_operations proc_tgid_attr_inode_operations
= {
1750 .lookup
= proc_tgid_attr_lookup
,
1753 static struct inode_operations proc_tid_attr_inode_operations
= {
1754 .lookup
= proc_tid_attr_lookup
,
1761 static int proc_self_readlink(struct dentry
*dentry
, char __user
*buffer
,
1765 sprintf(tmp
, "%d", current
->tgid
);
1766 return vfs_readlink(dentry
,buffer
,buflen
,tmp
);
1769 static void *proc_self_follow_link(struct dentry
*dentry
, struct nameidata
*nd
)
1772 sprintf(tmp
, "%d", current
->tgid
);
1773 return ERR_PTR(vfs_follow_link(nd
,tmp
));
1776 static struct inode_operations proc_self_inode_operations
= {
1777 .readlink
= proc_self_readlink
,
1778 .follow_link
= proc_self_follow_link
,
1782 * proc_pid_unhash - Unhash /proc/@pid entry from the dcache.
1783 * @p: task that should be flushed.
1785 * Drops the /proc/@pid dcache entry from the hash chains.
1787 * Dropping /proc/@pid entries and detach_pid must be synchroneous,
1788 * otherwise e.g. /proc/@pid/exe might point to the wrong executable,
1789 * if the pid value is immediately reused. This is enforced by
1790 * - caller must acquire spin_lock(p->proc_lock)
1791 * - must be called before detach_pid()
1792 * - proc_pid_lookup acquires proc_lock, and checks that
1793 * the target is not dead by looking at the attach count
1797 struct dentry
*proc_pid_unhash(struct task_struct
*p
)
1799 struct dentry
*proc_dentry
;
1801 proc_dentry
= p
->proc_dentry
;
1802 if (proc_dentry
!= NULL
) {
1804 spin_lock(&dcache_lock
);
1805 spin_lock(&proc_dentry
->d_lock
);
1806 if (!d_unhashed(proc_dentry
)) {
1807 dget_locked(proc_dentry
);
1808 __d_drop(proc_dentry
);
1809 spin_unlock(&proc_dentry
->d_lock
);
1811 spin_unlock(&proc_dentry
->d_lock
);
1814 spin_unlock(&dcache_lock
);
1820 * proc_pid_flush - recover memory used by stale /proc/@pid/x entries
1821 * @proc_dentry: directoy to prune.
1823 * Shrink the /proc directory that was used by the just killed thread.
1826 void proc_pid_flush(struct dentry
*proc_dentry
)
1829 if(proc_dentry
!= NULL
) {
1830 shrink_dcache_parent(proc_dentry
);
1836 struct dentry
*proc_pid_lookup(struct inode
*dir
, struct dentry
* dentry
, struct nameidata
*nd
)
1838 struct task_struct
*task
;
1839 struct inode
*inode
;
1840 struct proc_inode
*ei
;
1844 if (dentry
->d_name
.len
== 4 && !memcmp(dentry
->d_name
.name
,"self",4)) {
1845 inode
= new_inode(dir
->i_sb
);
1847 return ERR_PTR(-ENOMEM
);
1849 inode
->i_mtime
= inode
->i_atime
= inode
->i_ctime
= CURRENT_TIME
;
1850 inode
->i_ino
= fake_ino(0, PROC_TGID_INO
);
1852 inode
->i_mode
= S_IFLNK
|S_IRWXUGO
;
1853 inode
->i_uid
= inode
->i_gid
= 0;
1855 inode
->i_op
= &proc_self_inode_operations
;
1856 d_add(dentry
, inode
);
1859 tgid
= name_to_int(dentry
);
1863 read_lock(&tasklist_lock
);
1864 task
= find_task_by_pid(tgid
);
1866 get_task_struct(task
);
1867 read_unlock(&tasklist_lock
);
1871 inode
= proc_pid_make_inode(dir
->i_sb
, task
, PROC_TGID_INO
);
1875 put_task_struct(task
);
1878 inode
->i_mode
= S_IFDIR
|S_IRUGO
|S_IXUGO
;
1879 inode
->i_op
= &proc_tgid_base_inode_operations
;
1880 inode
->i_fop
= &proc_tgid_base_operations
;
1881 inode
->i_flags
|=S_IMMUTABLE
;
1882 #ifdef CONFIG_SECURITY
1888 dentry
->d_op
= &pid_base_dentry_operations
;
1891 d_add(dentry
, inode
);
1892 spin_lock(&task
->proc_lock
);
1893 task
->proc_dentry
= dentry
;
1894 if (!pid_alive(task
)) {
1895 dentry
= proc_pid_unhash(task
);
1898 spin_unlock(&task
->proc_lock
);
1900 put_task_struct(task
);
1902 proc_pid_flush(dentry
);
1907 return ERR_PTR(-ENOENT
);
1911 static struct dentry
*proc_task_lookup(struct inode
*dir
, struct dentry
* dentry
, struct nameidata
*nd
)
1913 struct task_struct
*task
;
1914 struct task_struct
*leader
= proc_task(dir
);
1915 struct inode
*inode
;
1918 tid
= name_to_int(dentry
);
1922 read_lock(&tasklist_lock
);
1923 task
= find_task_by_pid(tid
);
1925 get_task_struct(task
);
1926 read_unlock(&tasklist_lock
);
1929 if (leader
->tgid
!= task
->tgid
)
1932 inode
= proc_pid_make_inode(dir
->i_sb
, task
, PROC_TID_INO
);
1937 inode
->i_mode
= S_IFDIR
|S_IRUGO
|S_IXUGO
;
1938 inode
->i_op
= &proc_tid_base_inode_operations
;
1939 inode
->i_fop
= &proc_tid_base_operations
;
1940 inode
->i_flags
|=S_IMMUTABLE
;
1941 #ifdef CONFIG_SECURITY
1947 dentry
->d_op
= &pid_base_dentry_operations
;
1949 d_add(dentry
, inode
);
1951 put_task_struct(task
);
1954 put_task_struct(task
);
1956 return ERR_PTR(-ENOENT
);
1959 #define PROC_NUMBUF 10
1960 #define PROC_MAXPIDS 20
1963 * Get a few tgid's to return for filldir - we need to hold the
1964 * tasklist lock while doing this, and we must release it before
1965 * we actually do the filldir itself, so we use a temp buffer..
1967 static int get_tgid_list(int index
, unsigned long version
, unsigned int *tgids
)
1969 struct task_struct
*p
;
1973 read_lock(&tasklist_lock
);
1976 p
= find_task_by_pid(version
);
1977 if (p
&& !thread_group_leader(p
))
1984 p
= next_task(&init_task
);
1986 for ( ; p
!= &init_task
; p
= next_task(p
)) {
1992 tgids
[nr_tgids
] = tgid
;
1994 if (nr_tgids
>= PROC_MAXPIDS
)
1997 read_unlock(&tasklist_lock
);
2002 * Get a few tid's to return for filldir - we need to hold the
2003 * tasklist lock while doing this, and we must release it before
2004 * we actually do the filldir itself, so we use a temp buffer..
2006 static int get_tid_list(int index
, unsigned int *tids
, struct inode
*dir
)
2008 struct task_struct
*leader_task
= proc_task(dir
);
2009 struct task_struct
*task
= leader_task
;
2013 read_lock(&tasklist_lock
);
2015 * The starting point task (leader_task) might be an already
2016 * unlinked task, which cannot be used to access the task-list
2017 * via next_thread().
2019 if (pid_alive(task
)) do {
2020 int tid
= task
->pid
;
2025 tids
[nr_tids
] = tid
;
2027 if (nr_tids
>= PROC_MAXPIDS
)
2029 } while ((task
= next_thread(task
)) != leader_task
);
2030 read_unlock(&tasklist_lock
);
2034 /* for the /proc/ directory itself, after non-process stuff has been done */
2035 int proc_pid_readdir(struct file
* filp
, void * dirent
, filldir_t filldir
)
2037 unsigned int tgid_array
[PROC_MAXPIDS
];
2038 char buf
[PROC_NUMBUF
];
2039 unsigned int nr
= filp
->f_pos
- FIRST_PROCESS_ENTRY
;
2040 unsigned int nr_tgids
, i
;
2044 ino_t ino
= fake_ino(0,PROC_TGID_INO
);
2045 if (filldir(dirent
, "self", 4, filp
->f_pos
, ino
, DT_LNK
) < 0)
2051 /* f_version caches the tgid value that the last readdir call couldn't
2052 * return. lseek aka telldir automagically resets f_version to 0.
2054 next_tgid
= filp
->f_version
;
2055 filp
->f_version
= 0;
2057 nr_tgids
= get_tgid_list(nr
, next_tgid
, tgid_array
);
2059 /* no more entries ! */
2064 /* do not use the last found pid, reserve it for next_tgid */
2065 if (nr_tgids
== PROC_MAXPIDS
) {
2067 next_tgid
= tgid_array
[nr_tgids
];
2070 for (i
=0;i
<nr_tgids
;i
++) {
2071 int tgid
= tgid_array
[i
];
2072 ino_t ino
= fake_ino(tgid
,PROC_TGID_INO
);
2073 unsigned long j
= PROC_NUMBUF
;
2076 buf
[--j
] = '0' + (tgid
% 10);
2077 while ((tgid
/= 10) != 0);
2079 if (filldir(dirent
, buf
+j
, PROC_NUMBUF
-j
, filp
->f_pos
, ino
, DT_DIR
) < 0) {
2080 /* returning this tgid failed, save it as the first
2081 * pid for the next readir call */
2082 filp
->f_version
= tgid_array
[i
];
2093 /* for the /proc/TGID/task/ directories */
2094 static int proc_task_readdir(struct file
* filp
, void * dirent
, filldir_t filldir
)
2096 unsigned int tid_array
[PROC_MAXPIDS
];
2097 char buf
[PROC_NUMBUF
];
2098 unsigned int nr_tids
, i
;
2099 struct dentry
*dentry
= filp
->f_dentry
;
2100 struct inode
*inode
= dentry
->d_inode
;
2101 int retval
= -ENOENT
;
2103 unsigned long pos
= filp
->f_pos
; /* avoiding "long long" filp->f_pos */
2105 if (!pid_alive(proc_task(inode
)))
2112 if (filldir(dirent
, ".", 1, pos
, ino
, DT_DIR
) < 0)
2117 ino
= parent_ino(dentry
);
2118 if (filldir(dirent
, "..", 2, pos
, ino
, DT_DIR
) < 0)
2124 nr_tids
= get_tid_list(pos
, tid_array
, inode
);
2125 inode
->i_nlink
= pos
+ nr_tids
;
2127 for (i
= 0; i
< nr_tids
; i
++) {
2128 unsigned long j
= PROC_NUMBUF
;
2129 int tid
= tid_array
[i
];
2131 ino
= fake_ino(tid
,PROC_TID_INO
);
2134 buf
[--j
] = '0' + (tid
% 10);
2135 while ((tid
/= 10) != 0);
2137 if (filldir(dirent
, buf
+j
, PROC_NUMBUF
-j
, pos
, ino
, DT_DIR
) < 0)