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 */
188 /* Worst case buffer size needed for holding an integer. */
189 #define PROC_NUMBUF 10
198 #define E(type,name,mode) {(type),sizeof(name)-1,(name),(mode)}
200 static struct pid_entry tgid_base_stuff
[] = {
201 E(PROC_TGID_TASK
, "task", S_IFDIR
|S_IRUGO
|S_IXUGO
),
202 E(PROC_TGID_FD
, "fd", S_IFDIR
|S_IRUSR
|S_IXUSR
),
203 E(PROC_TGID_ENVIRON
, "environ", S_IFREG
|S_IRUSR
),
204 E(PROC_TGID_AUXV
, "auxv", S_IFREG
|S_IRUSR
),
205 E(PROC_TGID_STATUS
, "status", S_IFREG
|S_IRUGO
),
206 E(PROC_TGID_CMDLINE
, "cmdline", S_IFREG
|S_IRUGO
),
207 E(PROC_TGID_STAT
, "stat", S_IFREG
|S_IRUGO
),
208 E(PROC_TGID_STATM
, "statm", S_IFREG
|S_IRUGO
),
209 E(PROC_TGID_MAPS
, "maps", S_IFREG
|S_IRUGO
),
211 E(PROC_TGID_NUMA_MAPS
, "numa_maps", S_IFREG
|S_IRUGO
),
213 E(PROC_TGID_MEM
, "mem", S_IFREG
|S_IRUSR
|S_IWUSR
),
214 #ifdef CONFIG_SECCOMP
215 E(PROC_TGID_SECCOMP
, "seccomp", S_IFREG
|S_IRUSR
|S_IWUSR
),
217 E(PROC_TGID_CWD
, "cwd", S_IFLNK
|S_IRWXUGO
),
218 E(PROC_TGID_ROOT
, "root", S_IFLNK
|S_IRWXUGO
),
219 E(PROC_TGID_EXE
, "exe", S_IFLNK
|S_IRWXUGO
),
220 E(PROC_TGID_MOUNTS
, "mounts", S_IFREG
|S_IRUGO
),
221 E(PROC_TGID_MOUNTSTATS
, "mountstats", S_IFREG
|S_IRUSR
),
223 E(PROC_TGID_SMAPS
, "smaps", S_IFREG
|S_IRUGO
),
225 #ifdef CONFIG_SECURITY
226 E(PROC_TGID_ATTR
, "attr", S_IFDIR
|S_IRUGO
|S_IXUGO
),
228 #ifdef CONFIG_KALLSYMS
229 E(PROC_TGID_WCHAN
, "wchan", S_IFREG
|S_IRUGO
),
231 #ifdef CONFIG_SCHEDSTATS
232 E(PROC_TGID_SCHEDSTAT
, "schedstat", S_IFREG
|S_IRUGO
),
234 #ifdef CONFIG_CPUSETS
235 E(PROC_TGID_CPUSET
, "cpuset", S_IFREG
|S_IRUGO
),
237 E(PROC_TGID_OOM_SCORE
, "oom_score",S_IFREG
|S_IRUGO
),
238 E(PROC_TGID_OOM_ADJUST
,"oom_adj", S_IFREG
|S_IRUGO
|S_IWUSR
),
239 #ifdef CONFIG_AUDITSYSCALL
240 E(PROC_TGID_LOGINUID
, "loginuid", S_IFREG
|S_IWUSR
|S_IRUGO
),
244 static struct pid_entry tid_base_stuff
[] = {
245 E(PROC_TID_FD
, "fd", S_IFDIR
|S_IRUSR
|S_IXUSR
),
246 E(PROC_TID_ENVIRON
, "environ", S_IFREG
|S_IRUSR
),
247 E(PROC_TID_AUXV
, "auxv", S_IFREG
|S_IRUSR
),
248 E(PROC_TID_STATUS
, "status", S_IFREG
|S_IRUGO
),
249 E(PROC_TID_CMDLINE
, "cmdline", S_IFREG
|S_IRUGO
),
250 E(PROC_TID_STAT
, "stat", S_IFREG
|S_IRUGO
),
251 E(PROC_TID_STATM
, "statm", S_IFREG
|S_IRUGO
),
252 E(PROC_TID_MAPS
, "maps", S_IFREG
|S_IRUGO
),
254 E(PROC_TID_NUMA_MAPS
, "numa_maps", S_IFREG
|S_IRUGO
),
256 E(PROC_TID_MEM
, "mem", S_IFREG
|S_IRUSR
|S_IWUSR
),
257 #ifdef CONFIG_SECCOMP
258 E(PROC_TID_SECCOMP
, "seccomp", S_IFREG
|S_IRUSR
|S_IWUSR
),
260 E(PROC_TID_CWD
, "cwd", S_IFLNK
|S_IRWXUGO
),
261 E(PROC_TID_ROOT
, "root", S_IFLNK
|S_IRWXUGO
),
262 E(PROC_TID_EXE
, "exe", S_IFLNK
|S_IRWXUGO
),
263 E(PROC_TID_MOUNTS
, "mounts", S_IFREG
|S_IRUGO
),
265 E(PROC_TID_SMAPS
, "smaps", S_IFREG
|S_IRUGO
),
267 #ifdef CONFIG_SECURITY
268 E(PROC_TID_ATTR
, "attr", S_IFDIR
|S_IRUGO
|S_IXUGO
),
270 #ifdef CONFIG_KALLSYMS
271 E(PROC_TID_WCHAN
, "wchan", S_IFREG
|S_IRUGO
),
273 #ifdef CONFIG_SCHEDSTATS
274 E(PROC_TID_SCHEDSTAT
, "schedstat",S_IFREG
|S_IRUGO
),
276 #ifdef CONFIG_CPUSETS
277 E(PROC_TID_CPUSET
, "cpuset", S_IFREG
|S_IRUGO
),
279 E(PROC_TID_OOM_SCORE
, "oom_score",S_IFREG
|S_IRUGO
),
280 E(PROC_TID_OOM_ADJUST
, "oom_adj", S_IFREG
|S_IRUGO
|S_IWUSR
),
281 #ifdef CONFIG_AUDITSYSCALL
282 E(PROC_TID_LOGINUID
, "loginuid", S_IFREG
|S_IWUSR
|S_IRUGO
),
287 #ifdef CONFIG_SECURITY
288 static struct pid_entry tgid_attr_stuff
[] = {
289 E(PROC_TGID_ATTR_CURRENT
, "current", S_IFREG
|S_IRUGO
|S_IWUGO
),
290 E(PROC_TGID_ATTR_PREV
, "prev", S_IFREG
|S_IRUGO
),
291 E(PROC_TGID_ATTR_EXEC
, "exec", S_IFREG
|S_IRUGO
|S_IWUGO
),
292 E(PROC_TGID_ATTR_FSCREATE
, "fscreate", S_IFREG
|S_IRUGO
|S_IWUGO
),
293 E(PROC_TGID_ATTR_KEYCREATE
, "keycreate", S_IFREG
|S_IRUGO
|S_IWUGO
),
296 static struct pid_entry tid_attr_stuff
[] = {
297 E(PROC_TID_ATTR_CURRENT
, "current", S_IFREG
|S_IRUGO
|S_IWUGO
),
298 E(PROC_TID_ATTR_PREV
, "prev", S_IFREG
|S_IRUGO
),
299 E(PROC_TID_ATTR_EXEC
, "exec", S_IFREG
|S_IRUGO
|S_IWUGO
),
300 E(PROC_TID_ATTR_FSCREATE
, "fscreate", S_IFREG
|S_IRUGO
|S_IWUGO
),
301 E(PROC_TID_ATTR_KEYCREATE
, "keycreate", S_IFREG
|S_IRUGO
|S_IWUGO
),
308 static int proc_fd_link(struct inode
*inode
, struct dentry
**dentry
, struct vfsmount
**mnt
)
310 struct task_struct
*task
= get_proc_task(inode
);
311 struct files_struct
*files
= NULL
;
313 int fd
= proc_fd(inode
);
316 files
= get_files_struct(task
);
317 put_task_struct(task
);
321 * We are not taking a ref to the file structure, so we must
324 spin_lock(&files
->file_lock
);
325 file
= fcheck_files(files
, fd
);
327 *mnt
= mntget(file
->f_vfsmnt
);
328 *dentry
= dget(file
->f_dentry
);
329 spin_unlock(&files
->file_lock
);
330 put_files_struct(files
);
333 spin_unlock(&files
->file_lock
);
334 put_files_struct(files
);
339 static struct fs_struct
*get_fs_struct(struct task_struct
*task
)
341 struct fs_struct
*fs
;
345 atomic_inc(&fs
->count
);
350 static int get_nr_threads(struct task_struct
*tsk
)
352 /* Must be called with the rcu_read_lock held */
356 if (lock_task_sighand(tsk
, &flags
)) {
357 count
= atomic_read(&tsk
->signal
->count
);
358 unlock_task_sighand(tsk
, &flags
);
363 static int proc_cwd_link(struct inode
*inode
, struct dentry
**dentry
, struct vfsmount
**mnt
)
365 struct task_struct
*task
= get_proc_task(inode
);
366 struct fs_struct
*fs
= NULL
;
367 int result
= -ENOENT
;
370 fs
= get_fs_struct(task
);
371 put_task_struct(task
);
374 read_lock(&fs
->lock
);
375 *mnt
= mntget(fs
->pwdmnt
);
376 *dentry
= dget(fs
->pwd
);
377 read_unlock(&fs
->lock
);
384 static int proc_root_link(struct inode
*inode
, struct dentry
**dentry
, struct vfsmount
**mnt
)
386 struct task_struct
*task
= get_proc_task(inode
);
387 struct fs_struct
*fs
= NULL
;
388 int result
= -ENOENT
;
391 fs
= get_fs_struct(task
);
392 put_task_struct(task
);
395 read_lock(&fs
->lock
);
396 *mnt
= mntget(fs
->rootmnt
);
397 *dentry
= dget(fs
->root
);
398 read_unlock(&fs
->lock
);
405 #define MAY_PTRACE(task) \
406 (task == current || \
407 (task->parent == current && \
408 (task->ptrace & PT_PTRACED) && \
409 (task->state == TASK_STOPPED || task->state == TASK_TRACED) && \
410 security_ptrace(current,task) == 0))
412 static int proc_pid_environ(struct task_struct
*task
, char * buffer
)
415 struct mm_struct
*mm
= get_task_mm(task
);
417 unsigned int len
= mm
->env_end
- mm
->env_start
;
420 res
= access_process_vm(task
, mm
->env_start
, buffer
, len
, 0);
421 if (!ptrace_may_attach(task
))
428 static int proc_pid_cmdline(struct task_struct
*task
, char * buffer
)
432 struct mm_struct
*mm
= get_task_mm(task
);
436 goto out_mm
; /* Shh! No looking before we're done */
438 len
= mm
->arg_end
- mm
->arg_start
;
443 res
= access_process_vm(task
, mm
->arg_start
, buffer
, len
, 0);
445 // If the nul at the end of args has been overwritten, then
446 // assume application is using setproctitle(3).
447 if (res
> 0 && buffer
[res
-1] != '\0' && len
< PAGE_SIZE
) {
448 len
= strnlen(buffer
, res
);
452 len
= mm
->env_end
- mm
->env_start
;
453 if (len
> PAGE_SIZE
- res
)
454 len
= PAGE_SIZE
- res
;
455 res
+= access_process_vm(task
, mm
->env_start
, buffer
+res
, len
, 0);
456 res
= strnlen(buffer
, res
);
465 static int proc_pid_auxv(struct task_struct
*task
, char *buffer
)
468 struct mm_struct
*mm
= get_task_mm(task
);
470 unsigned int nwords
= 0;
473 while (mm
->saved_auxv
[nwords
- 2] != 0); /* AT_NULL */
474 res
= nwords
* sizeof(mm
->saved_auxv
[0]);
477 memcpy(buffer
, mm
->saved_auxv
, res
);
484 #ifdef CONFIG_KALLSYMS
486 * Provides a wchan file via kallsyms in a proper one-value-per-file format.
487 * Returns the resolved symbol. If that fails, simply return the address.
489 static int proc_pid_wchan(struct task_struct
*task
, char *buffer
)
492 const char *sym_name
;
493 unsigned long wchan
, size
, offset
;
494 char namebuf
[KSYM_NAME_LEN
+1];
496 wchan
= get_wchan(task
);
498 sym_name
= kallsyms_lookup(wchan
, &size
, &offset
, &modname
, namebuf
);
500 return sprintf(buffer
, "%s", sym_name
);
501 return sprintf(buffer
, "%lu", wchan
);
503 #endif /* CONFIG_KALLSYMS */
505 #ifdef CONFIG_SCHEDSTATS
507 * Provides /proc/PID/schedstat
509 static int proc_pid_schedstat(struct task_struct
*task
, char *buffer
)
511 return sprintf(buffer
, "%lu %lu %lu\n",
512 task
->sched_info
.cpu_time
,
513 task
->sched_info
.run_delay
,
514 task
->sched_info
.pcnt
);
518 /* The badness from the OOM killer */
519 unsigned long badness(struct task_struct
*p
, unsigned long uptime
);
520 static int proc_oom_score(struct task_struct
*task
, char *buffer
)
522 unsigned long points
;
523 struct timespec uptime
;
525 do_posix_clock_monotonic_gettime(&uptime
);
526 points
= badness(task
, uptime
.tv_sec
);
527 return sprintf(buffer
, "%lu\n", points
);
530 /************************************************************************/
531 /* Here the fs part begins */
532 /************************************************************************/
534 /* permission checks */
535 static int proc_fd_access_allowed(struct inode
*inode
)
537 struct task_struct
*task
;
539 /* Allow access to a task's file descriptors if it is us or we
540 * may use ptrace attach to the process and find out that
543 task
= get_proc_task(inode
);
545 allowed
= ptrace_may_attach(task
);
546 put_task_struct(task
);
551 extern struct seq_operations mounts_op
;
557 static int mounts_open(struct inode
*inode
, struct file
*file
)
559 struct task_struct
*task
= get_proc_task(inode
);
560 struct namespace *namespace = NULL
;
561 struct proc_mounts
*p
;
566 namespace = task
->namespace;
568 get_namespace(namespace);
570 put_task_struct(task
);
575 p
= kmalloc(sizeof(struct proc_mounts
), GFP_KERNEL
);
577 file
->private_data
= &p
->m
;
578 ret
= seq_open(file
, &mounts_op
);
580 p
->m
.private = namespace;
581 p
->event
= namespace->event
;
586 put_namespace(namespace);
591 static int mounts_release(struct inode
*inode
, struct file
*file
)
593 struct seq_file
*m
= file
->private_data
;
594 struct namespace *namespace = m
->private;
595 put_namespace(namespace);
596 return seq_release(inode
, file
);
599 static unsigned mounts_poll(struct file
*file
, poll_table
*wait
)
601 struct proc_mounts
*p
= file
->private_data
;
602 struct namespace *ns
= p
->m
.private;
605 poll_wait(file
, &ns
->poll
, wait
);
607 spin_lock(&vfsmount_lock
);
608 if (p
->event
!= ns
->event
) {
609 p
->event
= ns
->event
;
612 spin_unlock(&vfsmount_lock
);
617 static struct file_operations proc_mounts_operations
= {
621 .release
= mounts_release
,
625 extern struct seq_operations mountstats_op
;
626 static int mountstats_open(struct inode
*inode
, struct file
*file
)
628 int ret
= seq_open(file
, &mountstats_op
);
631 struct seq_file
*m
= file
->private_data
;
632 struct namespace *namespace = NULL
;
633 struct task_struct
*task
= get_proc_task(inode
);
637 namespace = task
->namespace;
639 get_namespace(namespace);
641 put_task_struct(task
);
645 m
->private = namespace;
647 seq_release(inode
, file
);
654 static struct file_operations proc_mountstats_operations
= {
655 .open
= mountstats_open
,
658 .release
= mounts_release
,
661 #define PROC_BLOCK_SIZE (3*1024) /* 4K page size but our output routines use some slack for overruns */
663 static ssize_t
proc_info_read(struct file
* file
, char __user
* buf
,
664 size_t count
, loff_t
*ppos
)
666 struct inode
* inode
= file
->f_dentry
->d_inode
;
669 struct task_struct
*task
= get_proc_task(inode
);
675 if (count
> PROC_BLOCK_SIZE
)
676 count
= PROC_BLOCK_SIZE
;
679 if (!(page
= __get_free_page(GFP_KERNEL
)))
682 length
= PROC_I(inode
)->op
.proc_read(task
, (char*)page
);
685 length
= simple_read_from_buffer(buf
, count
, ppos
, (char *)page
, length
);
688 put_task_struct(task
);
693 static struct file_operations proc_info_file_operations
= {
694 .read
= proc_info_read
,
697 static int mem_open(struct inode
* inode
, struct file
* file
)
699 file
->private_data
= (void*)((long)current
->self_exec_id
);
703 static ssize_t
mem_read(struct file
* file
, char __user
* buf
,
704 size_t count
, loff_t
*ppos
)
706 struct task_struct
*task
= get_proc_task(file
->f_dentry
->d_inode
);
708 unsigned long src
= *ppos
;
710 struct mm_struct
*mm
;
715 if (!MAY_PTRACE(task
) || !ptrace_may_attach(task
))
719 page
= (char *)__get_free_page(GFP_USER
);
725 mm
= get_task_mm(task
);
731 if (file
->private_data
!= (void*)((long)current
->self_exec_id
))
737 int this_len
, retval
;
739 this_len
= (count
> PAGE_SIZE
) ? PAGE_SIZE
: count
;
740 retval
= access_process_vm(task
, src
, page
, this_len
, 0);
741 if (!retval
|| !MAY_PTRACE(task
) || !ptrace_may_attach(task
)) {
747 if (copy_to_user(buf
, page
, retval
)) {
762 free_page((unsigned long) page
);
764 put_task_struct(task
);
769 #define mem_write NULL
772 /* This is a security hazard */
773 static ssize_t
mem_write(struct file
* file
, const char * buf
,
774 size_t count
, loff_t
*ppos
)
778 struct task_struct
*task
= get_proc_task(file
->f_dentry
->d_inode
);
779 unsigned long dst
= *ppos
;
785 if (!MAY_PTRACE(task
) || !ptrace_may_attach(task
))
789 page
= (char *)__get_free_page(GFP_USER
);
794 int this_len
, retval
;
796 this_len
= (count
> PAGE_SIZE
) ? PAGE_SIZE
: count
;
797 if (copy_from_user(page
, buf
, this_len
)) {
801 retval
= access_process_vm(task
, dst
, page
, this_len
, 1);
813 free_page((unsigned long) page
);
815 put_task_struct(task
);
821 static loff_t
mem_lseek(struct file
* file
, loff_t offset
, int orig
)
825 file
->f_pos
= offset
;
828 file
->f_pos
+= offset
;
833 force_successful_syscall_return();
837 static struct file_operations proc_mem_operations
= {
844 static ssize_t
oom_adjust_read(struct file
*file
, char __user
*buf
,
845 size_t count
, loff_t
*ppos
)
847 struct task_struct
*task
= get_proc_task(file
->f_dentry
->d_inode
);
848 char buffer
[PROC_NUMBUF
];
851 loff_t __ppos
= *ppos
;
855 oom_adjust
= task
->oomkilladj
;
856 put_task_struct(task
);
858 len
= snprintf(buffer
, sizeof(buffer
), "%i\n", oom_adjust
);
861 if (count
> len
-__ppos
)
863 if (copy_to_user(buf
, buffer
+ __ppos
, count
))
865 *ppos
= __ppos
+ count
;
869 static ssize_t
oom_adjust_write(struct file
*file
, const char __user
*buf
,
870 size_t count
, loff_t
*ppos
)
872 struct task_struct
*task
;
873 char buffer
[PROC_NUMBUF
], *end
;
876 if (!capable(CAP_SYS_RESOURCE
))
878 memset(buffer
, 0, sizeof(buffer
));
879 if (count
> sizeof(buffer
) - 1)
880 count
= sizeof(buffer
) - 1;
881 if (copy_from_user(buffer
, buf
, count
))
883 oom_adjust
= simple_strtol(buffer
, &end
, 0);
884 if ((oom_adjust
< -16 || oom_adjust
> 15) && oom_adjust
!= OOM_DISABLE
)
888 task
= get_proc_task(file
->f_dentry
->d_inode
);
891 task
->oomkilladj
= oom_adjust
;
892 put_task_struct(task
);
893 if (end
- buffer
== 0)
898 static struct file_operations proc_oom_adjust_operations
= {
899 .read
= oom_adjust_read
,
900 .write
= oom_adjust_write
,
903 #ifdef CONFIG_AUDITSYSCALL
905 static ssize_t
proc_loginuid_read(struct file
* file
, char __user
* buf
,
906 size_t count
, loff_t
*ppos
)
908 struct inode
* inode
= file
->f_dentry
->d_inode
;
909 struct task_struct
*task
= get_proc_task(inode
);
911 char tmpbuf
[TMPBUFLEN
];
915 length
= scnprintf(tmpbuf
, TMPBUFLEN
, "%u",
916 audit_get_loginuid(task
->audit_context
));
917 put_task_struct(task
);
918 return simple_read_from_buffer(buf
, count
, ppos
, tmpbuf
, length
);
921 static ssize_t
proc_loginuid_write(struct file
* file
, const char __user
* buf
,
922 size_t count
, loff_t
*ppos
)
924 struct inode
* inode
= file
->f_dentry
->d_inode
;
929 if (!capable(CAP_AUDIT_CONTROL
))
932 if (current
!= pid_task(proc_pid(inode
), PIDTYPE_PID
))
935 if (count
>= PAGE_SIZE
)
936 count
= PAGE_SIZE
- 1;
939 /* No partial writes. */
942 page
= (char*)__get_free_page(GFP_USER
);
946 if (copy_from_user(page
, buf
, count
))
950 loginuid
= simple_strtoul(page
, &tmp
, 10);
956 length
= audit_set_loginuid(current
, loginuid
);
957 if (likely(length
== 0))
961 free_page((unsigned long) page
);
965 static struct file_operations proc_loginuid_operations
= {
966 .read
= proc_loginuid_read
,
967 .write
= proc_loginuid_write
,
971 #ifdef CONFIG_SECCOMP
972 static ssize_t
seccomp_read(struct file
*file
, char __user
*buf
,
973 size_t count
, loff_t
*ppos
)
975 struct task_struct
*tsk
= get_proc_task(file
->f_dentry
->d_inode
);
977 loff_t __ppos
= *ppos
;
982 /* no need to print the trailing zero, so use only len */
983 len
= sprintf(__buf
, "%u\n", tsk
->seccomp
.mode
);
984 put_task_struct(tsk
);
987 if (count
> len
- __ppos
)
988 count
= len
- __ppos
;
989 if (copy_to_user(buf
, __buf
+ __ppos
, count
))
991 *ppos
= __ppos
+ count
;
995 static ssize_t
seccomp_write(struct file
*file
, const char __user
*buf
,
996 size_t count
, loff_t
*ppos
)
998 struct task_struct
*tsk
= get_proc_task(file
->f_dentry
->d_inode
);
999 char __buf
[20], *end
;
1000 unsigned int seccomp_mode
;
1007 /* can set it only once to be even more secure */
1009 if (unlikely(tsk
->seccomp
.mode
))
1013 memset(__buf
, 0, sizeof(__buf
));
1014 count
= min(count
, sizeof(__buf
) - 1);
1015 if (copy_from_user(__buf
, buf
, count
))
1018 seccomp_mode
= simple_strtoul(__buf
, &end
, 0);
1022 if (seccomp_mode
&& seccomp_mode
<= NR_SECCOMP_MODES
) {
1023 tsk
->seccomp
.mode
= seccomp_mode
;
1024 set_tsk_thread_flag(tsk
, TIF_SECCOMP
);
1028 if (unlikely(!(end
- __buf
)))
1030 result
= end
- __buf
;
1032 put_task_struct(tsk
);
1037 static struct file_operations proc_seccomp_operations
= {
1038 .read
= seccomp_read
,
1039 .write
= seccomp_write
,
1041 #endif /* CONFIG_SECCOMP */
1043 static void *proc_pid_follow_link(struct dentry
*dentry
, struct nameidata
*nd
)
1045 struct inode
*inode
= dentry
->d_inode
;
1046 int error
= -EACCES
;
1048 /* We don't need a base pointer in the /proc filesystem */
1051 /* Are we allowed to snoop on the tasks file descriptors? */
1052 if (!proc_fd_access_allowed(inode
))
1055 error
= PROC_I(inode
)->op
.proc_get_link(inode
, &nd
->dentry
, &nd
->mnt
);
1056 nd
->last_type
= LAST_BIND
;
1058 return ERR_PTR(error
);
1061 static int do_proc_readlink(struct dentry
*dentry
, struct vfsmount
*mnt
,
1062 char __user
*buffer
, int buflen
)
1064 struct inode
* inode
;
1065 char *tmp
= (char*)__get_free_page(GFP_KERNEL
), *path
;
1071 inode
= dentry
->d_inode
;
1072 path
= d_path(dentry
, mnt
, tmp
, PAGE_SIZE
);
1073 len
= PTR_ERR(path
);
1076 len
= tmp
+ PAGE_SIZE
- 1 - path
;
1080 if (copy_to_user(buffer
, path
, len
))
1083 free_page((unsigned long)tmp
);
1087 static int proc_pid_readlink(struct dentry
* dentry
, char __user
* buffer
, int buflen
)
1089 int error
= -EACCES
;
1090 struct inode
*inode
= dentry
->d_inode
;
1092 struct vfsmount
*mnt
= NULL
;
1094 /* Are we allowed to snoop on the tasks file descriptors? */
1095 if (!proc_fd_access_allowed(inode
))
1098 error
= PROC_I(inode
)->op
.proc_get_link(inode
, &de
, &mnt
);
1102 error
= do_proc_readlink(de
, mnt
, buffer
, buflen
);
1109 static struct inode_operations proc_pid_link_inode_operations
= {
1110 .readlink
= proc_pid_readlink
,
1111 .follow_link
= proc_pid_follow_link
1114 static int proc_readfd(struct file
* filp
, void * dirent
, filldir_t filldir
)
1116 struct dentry
*dentry
= filp
->f_dentry
;
1117 struct inode
*inode
= dentry
->d_inode
;
1118 struct task_struct
*p
= get_proc_task(inode
);
1119 unsigned int fd
, tid
, ino
;
1121 char buf
[PROC_NUMBUF
];
1122 struct files_struct
* files
;
1123 struct fdtable
*fdt
;
1134 if (filldir(dirent
, ".", 1, 0, inode
->i_ino
, DT_DIR
) < 0)
1138 ino
= parent_ino(dentry
);
1139 if (filldir(dirent
, "..", 2, 1, ino
, DT_DIR
) < 0)
1143 files
= get_files_struct(p
);
1147 fdt
= files_fdtable(files
);
1148 for (fd
= filp
->f_pos
-2;
1150 fd
++, filp
->f_pos
++) {
1153 if (!fcheck_files(files
, fd
))
1161 buf
[j
] = '0' + (i
% 10);
1165 ino
= fake_ino(tid
, PROC_TID_FD_DIR
+ fd
);
1166 if (filldir(dirent
, buf
+j
, PROC_NUMBUF
-j
, fd
+2, ino
, DT_LNK
) < 0) {
1173 put_files_struct(files
);
1181 static int proc_pident_readdir(struct file
*filp
,
1182 void *dirent
, filldir_t filldir
,
1183 struct pid_entry
*ents
, unsigned int nents
)
1187 struct dentry
*dentry
= filp
->f_dentry
;
1188 struct inode
*inode
= dentry
->d_inode
;
1189 struct task_struct
*task
= get_proc_task(inode
);
1190 struct pid_entry
*p
;
1200 put_task_struct(task
);
1205 if (filldir(dirent
, ".", 1, i
, ino
, DT_DIR
) < 0)
1211 ino
= parent_ino(dentry
);
1212 if (filldir(dirent
, "..", 2, i
, ino
, DT_DIR
) < 0)
1225 if (filldir(dirent
, p
->name
, p
->len
, filp
->f_pos
,
1226 fake_ino(pid
, p
->type
), p
->mode
>> 12) < 0)
1238 static int proc_tgid_base_readdir(struct file
* filp
,
1239 void * dirent
, filldir_t filldir
)
1241 return proc_pident_readdir(filp
,dirent
,filldir
,
1242 tgid_base_stuff
,ARRAY_SIZE(tgid_base_stuff
));
1245 static int proc_tid_base_readdir(struct file
* filp
,
1246 void * dirent
, filldir_t filldir
)
1248 return proc_pident_readdir(filp
,dirent
,filldir
,
1249 tid_base_stuff
,ARRAY_SIZE(tid_base_stuff
));
1252 /* building an inode */
1254 static int task_dumpable(struct task_struct
*task
)
1257 struct mm_struct
*mm
;
1262 dumpable
= mm
->dumpable
;
1270 static struct inode
*proc_pid_make_inode(struct super_block
* sb
, struct task_struct
*task
, int ino
)
1272 struct inode
* inode
;
1273 struct proc_inode
*ei
;
1275 /* We need a new inode */
1277 inode
= new_inode(sb
);
1283 inode
->i_mtime
= inode
->i_atime
= inode
->i_ctime
= CURRENT_TIME
;
1284 inode
->i_ino
= fake_ino(task
->pid
, ino
);
1287 * grab the reference to task.
1289 ei
->pid
= get_pid(task
->pids
[PIDTYPE_PID
].pid
);
1295 if (task_dumpable(task
)) {
1296 inode
->i_uid
= task
->euid
;
1297 inode
->i_gid
= task
->egid
;
1299 security_task_to_inode(task
, inode
);
1312 * Exceptional case: normally we are not allowed to unhash a busy
1313 * directory. In this case, however, we can do it - no aliasing problems
1314 * due to the way we treat inodes.
1316 * Rewrite the inode's ownerships here because the owning task may have
1317 * performed a setuid(), etc.
1319 * Before the /proc/pid/status file was created the only way to read
1320 * the effective uid of a /process was to stat /proc/pid. Reading
1321 * /proc/pid/status is slow enough that procps and other packages
1322 * kept stating /proc/pid. To keep the rules in /proc simple I have
1323 * made this apply to all per process world readable and executable
1326 static int pid_revalidate(struct dentry
*dentry
, struct nameidata
*nd
)
1328 struct inode
*inode
= dentry
->d_inode
;
1329 struct task_struct
*task
= get_proc_task(inode
);
1331 if ((inode
->i_mode
== (S_IFDIR
|S_IRUGO
|S_IXUGO
)) ||
1332 task_dumpable(task
)) {
1333 inode
->i_uid
= task
->euid
;
1334 inode
->i_gid
= task
->egid
;
1339 security_task_to_inode(task
, inode
);
1340 put_task_struct(task
);
1347 static int pid_getattr(struct vfsmount
*mnt
, struct dentry
*dentry
, struct kstat
*stat
)
1349 struct inode
*inode
= dentry
->d_inode
;
1350 struct task_struct
*task
;
1351 generic_fillattr(inode
, stat
);
1356 task
= pid_task(proc_pid(inode
), PIDTYPE_PID
);
1358 if ((inode
->i_mode
== (S_IFDIR
|S_IRUGO
|S_IXUGO
)) ||
1359 task_dumpable(task
)) {
1360 stat
->uid
= task
->euid
;
1361 stat
->gid
= task
->egid
;
1368 static int tid_fd_revalidate(struct dentry
*dentry
, struct nameidata
*nd
)
1370 struct inode
*inode
= dentry
->d_inode
;
1371 struct task_struct
*task
= get_proc_task(inode
);
1372 int fd
= proc_fd(inode
);
1373 struct files_struct
*files
;
1376 files
= get_files_struct(task
);
1379 if (fcheck_files(files
, fd
)) {
1381 put_files_struct(files
);
1382 if (task_dumpable(task
)) {
1383 inode
->i_uid
= task
->euid
;
1384 inode
->i_gid
= task
->egid
;
1389 security_task_to_inode(task
, inode
);
1390 put_task_struct(task
);
1394 put_files_struct(files
);
1396 put_task_struct(task
);
1402 static int pid_delete_dentry(struct dentry
* dentry
)
1404 /* Is the task we represent dead?
1405 * If so, then don't put the dentry on the lru list,
1406 * kill it immediately.
1408 return !proc_pid(dentry
->d_inode
)->tasks
[PIDTYPE_PID
].first
;
1411 static struct dentry_operations tid_fd_dentry_operations
=
1413 .d_revalidate
= tid_fd_revalidate
,
1414 .d_delete
= pid_delete_dentry
,
1417 static struct dentry_operations pid_dentry_operations
=
1419 .d_revalidate
= pid_revalidate
,
1420 .d_delete
= pid_delete_dentry
,
1425 static unsigned name_to_int(struct dentry
*dentry
)
1427 const char *name
= dentry
->d_name
.name
;
1428 int len
= dentry
->d_name
.len
;
1431 if (len
> 1 && *name
== '0')
1434 unsigned c
= *name
++ - '0';
1437 if (n
>= (~0U-9)/10)
1448 static struct dentry
*proc_lookupfd(struct inode
* dir
, struct dentry
* dentry
, struct nameidata
*nd
)
1450 struct task_struct
*task
= get_proc_task(dir
);
1451 unsigned fd
= name_to_int(dentry
);
1452 struct dentry
*result
= ERR_PTR(-ENOENT
);
1454 struct files_struct
* files
;
1455 struct inode
*inode
;
1456 struct proc_inode
*ei
;
1463 inode
= proc_pid_make_inode(dir
->i_sb
, task
, PROC_TID_FD_DIR
+fd
);
1468 files
= get_files_struct(task
);
1471 inode
->i_mode
= S_IFLNK
;
1474 * We are not taking a ref to the file structure, so we must
1477 spin_lock(&files
->file_lock
);
1478 file
= fcheck_files(files
, fd
);
1481 if (file
->f_mode
& 1)
1482 inode
->i_mode
|= S_IRUSR
| S_IXUSR
;
1483 if (file
->f_mode
& 2)
1484 inode
->i_mode
|= S_IWUSR
| S_IXUSR
;
1485 spin_unlock(&files
->file_lock
);
1486 put_files_struct(files
);
1487 inode
->i_op
= &proc_pid_link_inode_operations
;
1489 ei
->op
.proc_get_link
= proc_fd_link
;
1490 dentry
->d_op
= &tid_fd_dentry_operations
;
1491 d_add(dentry
, inode
);
1492 /* Close the race of the process dying before we return the dentry */
1493 if (tid_fd_revalidate(dentry
, NULL
))
1496 put_task_struct(task
);
1501 spin_unlock(&files
->file_lock
);
1502 put_files_struct(files
);
1508 static int proc_task_readdir(struct file
* filp
, void * dirent
, filldir_t filldir
);
1509 static struct dentry
*proc_task_lookup(struct inode
*dir
, struct dentry
* dentry
, struct nameidata
*nd
);
1510 static int proc_task_getattr(struct vfsmount
*mnt
, struct dentry
*dentry
, struct kstat
*stat
);
1512 static struct file_operations proc_fd_operations
= {
1513 .read
= generic_read_dir
,
1514 .readdir
= proc_readfd
,
1517 static struct file_operations proc_task_operations
= {
1518 .read
= generic_read_dir
,
1519 .readdir
= proc_task_readdir
,
1523 * proc directories can do almost nothing..
1525 static struct inode_operations proc_fd_inode_operations
= {
1526 .lookup
= proc_lookupfd
,
1529 static struct inode_operations proc_task_inode_operations
= {
1530 .lookup
= proc_task_lookup
,
1531 .getattr
= proc_task_getattr
,
1534 #ifdef CONFIG_SECURITY
1535 static ssize_t
proc_pid_attr_read(struct file
* file
, char __user
* buf
,
1536 size_t count
, loff_t
*ppos
)
1538 struct inode
* inode
= file
->f_dentry
->d_inode
;
1541 struct task_struct
*task
= get_proc_task(inode
);
1547 if (count
> PAGE_SIZE
)
1550 if (!(page
= __get_free_page(GFP_KERNEL
)))
1553 length
= security_getprocattr(task
,
1554 (char*)file
->f_dentry
->d_name
.name
,
1555 (void*)page
, count
);
1557 length
= simple_read_from_buffer(buf
, count
, ppos
, (char *)page
, length
);
1560 put_task_struct(task
);
1565 static ssize_t
proc_pid_attr_write(struct file
* file
, const char __user
* buf
,
1566 size_t count
, loff_t
*ppos
)
1568 struct inode
* inode
= file
->f_dentry
->d_inode
;
1571 struct task_struct
*task
= get_proc_task(inode
);
1576 if (count
> PAGE_SIZE
)
1579 /* No partial writes. */
1585 page
= (char*)__get_free_page(GFP_USER
);
1590 if (copy_from_user(page
, buf
, count
))
1593 length
= security_setprocattr(task
,
1594 (char*)file
->f_dentry
->d_name
.name
,
1595 (void*)page
, count
);
1597 free_page((unsigned long) page
);
1599 put_task_struct(task
);
1604 static struct file_operations proc_pid_attr_operations
= {
1605 .read
= proc_pid_attr_read
,
1606 .write
= proc_pid_attr_write
,
1609 static struct file_operations proc_tid_attr_operations
;
1610 static struct inode_operations proc_tid_attr_inode_operations
;
1611 static struct file_operations proc_tgid_attr_operations
;
1612 static struct inode_operations proc_tgid_attr_inode_operations
;
1616 static struct dentry
*proc_pident_lookup(struct inode
*dir
,
1617 struct dentry
*dentry
,
1618 struct pid_entry
*ents
)
1620 struct inode
*inode
;
1621 struct dentry
*error
;
1622 struct task_struct
*task
= get_proc_task(dir
);
1623 struct pid_entry
*p
;
1624 struct proc_inode
*ei
;
1626 error
= ERR_PTR(-ENOENT
);
1632 for (p
= ents
; p
->name
; p
++) {
1633 if (p
->len
!= dentry
->d_name
.len
)
1635 if (!memcmp(dentry
->d_name
.name
, p
->name
, p
->len
))
1641 error
= ERR_PTR(-EINVAL
);
1642 inode
= proc_pid_make_inode(dir
->i_sb
, task
, p
->type
);
1647 inode
->i_mode
= p
->mode
;
1649 * Yes, it does not scale. And it should not. Don't add
1650 * new entries into /proc/<tgid>/ without very good reasons.
1653 case PROC_TGID_TASK
:
1655 inode
->i_op
= &proc_task_inode_operations
;
1656 inode
->i_fop
= &proc_task_operations
;
1661 inode
->i_op
= &proc_fd_inode_operations
;
1662 inode
->i_fop
= &proc_fd_operations
;
1666 inode
->i_op
= &proc_pid_link_inode_operations
;
1667 ei
->op
.proc_get_link
= proc_exe_link
;
1671 inode
->i_op
= &proc_pid_link_inode_operations
;
1672 ei
->op
.proc_get_link
= proc_cwd_link
;
1675 case PROC_TGID_ROOT
:
1676 inode
->i_op
= &proc_pid_link_inode_operations
;
1677 ei
->op
.proc_get_link
= proc_root_link
;
1679 case PROC_TID_ENVIRON
:
1680 case PROC_TGID_ENVIRON
:
1681 inode
->i_fop
= &proc_info_file_operations
;
1682 ei
->op
.proc_read
= proc_pid_environ
;
1685 case PROC_TGID_AUXV
:
1686 inode
->i_fop
= &proc_info_file_operations
;
1687 ei
->op
.proc_read
= proc_pid_auxv
;
1689 case PROC_TID_STATUS
:
1690 case PROC_TGID_STATUS
:
1691 inode
->i_fop
= &proc_info_file_operations
;
1692 ei
->op
.proc_read
= proc_pid_status
;
1695 inode
->i_fop
= &proc_info_file_operations
;
1696 ei
->op
.proc_read
= proc_tid_stat
;
1698 case PROC_TGID_STAT
:
1699 inode
->i_fop
= &proc_info_file_operations
;
1700 ei
->op
.proc_read
= proc_tgid_stat
;
1702 case PROC_TID_CMDLINE
:
1703 case PROC_TGID_CMDLINE
:
1704 inode
->i_fop
= &proc_info_file_operations
;
1705 ei
->op
.proc_read
= proc_pid_cmdline
;
1707 case PROC_TID_STATM
:
1708 case PROC_TGID_STATM
:
1709 inode
->i_fop
= &proc_info_file_operations
;
1710 ei
->op
.proc_read
= proc_pid_statm
;
1713 case PROC_TGID_MAPS
:
1714 inode
->i_fop
= &proc_maps_operations
;
1717 case PROC_TID_NUMA_MAPS
:
1718 case PROC_TGID_NUMA_MAPS
:
1719 inode
->i_fop
= &proc_numa_maps_operations
;
1724 inode
->i_fop
= &proc_mem_operations
;
1726 #ifdef CONFIG_SECCOMP
1727 case PROC_TID_SECCOMP
:
1728 case PROC_TGID_SECCOMP
:
1729 inode
->i_fop
= &proc_seccomp_operations
;
1731 #endif /* CONFIG_SECCOMP */
1732 case PROC_TID_MOUNTS
:
1733 case PROC_TGID_MOUNTS
:
1734 inode
->i_fop
= &proc_mounts_operations
;
1737 case PROC_TID_SMAPS
:
1738 case PROC_TGID_SMAPS
:
1739 inode
->i_fop
= &proc_smaps_operations
;
1742 case PROC_TID_MOUNTSTATS
:
1743 case PROC_TGID_MOUNTSTATS
:
1744 inode
->i_fop
= &proc_mountstats_operations
;
1746 #ifdef CONFIG_SECURITY
1749 inode
->i_op
= &proc_tid_attr_inode_operations
;
1750 inode
->i_fop
= &proc_tid_attr_operations
;
1752 case PROC_TGID_ATTR
:
1754 inode
->i_op
= &proc_tgid_attr_inode_operations
;
1755 inode
->i_fop
= &proc_tgid_attr_operations
;
1757 case PROC_TID_ATTR_CURRENT
:
1758 case PROC_TGID_ATTR_CURRENT
:
1759 case PROC_TID_ATTR_PREV
:
1760 case PROC_TGID_ATTR_PREV
:
1761 case PROC_TID_ATTR_EXEC
:
1762 case PROC_TGID_ATTR_EXEC
:
1763 case PROC_TID_ATTR_FSCREATE
:
1764 case PROC_TGID_ATTR_FSCREATE
:
1765 case PROC_TID_ATTR_KEYCREATE
:
1766 case PROC_TGID_ATTR_KEYCREATE
:
1767 inode
->i_fop
= &proc_pid_attr_operations
;
1770 #ifdef CONFIG_KALLSYMS
1771 case PROC_TID_WCHAN
:
1772 case PROC_TGID_WCHAN
:
1773 inode
->i_fop
= &proc_info_file_operations
;
1774 ei
->op
.proc_read
= proc_pid_wchan
;
1777 #ifdef CONFIG_SCHEDSTATS
1778 case PROC_TID_SCHEDSTAT
:
1779 case PROC_TGID_SCHEDSTAT
:
1780 inode
->i_fop
= &proc_info_file_operations
;
1781 ei
->op
.proc_read
= proc_pid_schedstat
;
1784 #ifdef CONFIG_CPUSETS
1785 case PROC_TID_CPUSET
:
1786 case PROC_TGID_CPUSET
:
1787 inode
->i_fop
= &proc_cpuset_operations
;
1790 case PROC_TID_OOM_SCORE
:
1791 case PROC_TGID_OOM_SCORE
:
1792 inode
->i_fop
= &proc_info_file_operations
;
1793 ei
->op
.proc_read
= proc_oom_score
;
1795 case PROC_TID_OOM_ADJUST
:
1796 case PROC_TGID_OOM_ADJUST
:
1797 inode
->i_fop
= &proc_oom_adjust_operations
;
1799 #ifdef CONFIG_AUDITSYSCALL
1800 case PROC_TID_LOGINUID
:
1801 case PROC_TGID_LOGINUID
:
1802 inode
->i_fop
= &proc_loginuid_operations
;
1806 printk("procfs: impossible type (%d)",p
->type
);
1808 error
= ERR_PTR(-EINVAL
);
1811 dentry
->d_op
= &pid_dentry_operations
;
1812 d_add(dentry
, inode
);
1813 /* Close the race of the process dying before we return the dentry */
1814 if (pid_revalidate(dentry
, NULL
))
1817 put_task_struct(task
);
1822 static struct dentry
*proc_tgid_base_lookup(struct inode
*dir
, struct dentry
*dentry
, struct nameidata
*nd
){
1823 return proc_pident_lookup(dir
, dentry
, tgid_base_stuff
);
1826 static struct dentry
*proc_tid_base_lookup(struct inode
*dir
, struct dentry
*dentry
, struct nameidata
*nd
){
1827 return proc_pident_lookup(dir
, dentry
, tid_base_stuff
);
1830 static struct file_operations proc_tgid_base_operations
= {
1831 .read
= generic_read_dir
,
1832 .readdir
= proc_tgid_base_readdir
,
1835 static struct file_operations proc_tid_base_operations
= {
1836 .read
= generic_read_dir
,
1837 .readdir
= proc_tid_base_readdir
,
1840 static struct inode_operations proc_tgid_base_inode_operations
= {
1841 .lookup
= proc_tgid_base_lookup
,
1842 .getattr
= pid_getattr
,
1845 static struct inode_operations proc_tid_base_inode_operations
= {
1846 .lookup
= proc_tid_base_lookup
,
1847 .getattr
= pid_getattr
,
1850 #ifdef CONFIG_SECURITY
1851 static int proc_tgid_attr_readdir(struct file
* filp
,
1852 void * dirent
, filldir_t filldir
)
1854 return proc_pident_readdir(filp
,dirent
,filldir
,
1855 tgid_attr_stuff
,ARRAY_SIZE(tgid_attr_stuff
));
1858 static int proc_tid_attr_readdir(struct file
* filp
,
1859 void * dirent
, filldir_t filldir
)
1861 return proc_pident_readdir(filp
,dirent
,filldir
,
1862 tid_attr_stuff
,ARRAY_SIZE(tid_attr_stuff
));
1865 static struct file_operations proc_tgid_attr_operations
= {
1866 .read
= generic_read_dir
,
1867 .readdir
= proc_tgid_attr_readdir
,
1870 static struct file_operations proc_tid_attr_operations
= {
1871 .read
= generic_read_dir
,
1872 .readdir
= proc_tid_attr_readdir
,
1875 static struct dentry
*proc_tgid_attr_lookup(struct inode
*dir
,
1876 struct dentry
*dentry
, struct nameidata
*nd
)
1878 return proc_pident_lookup(dir
, dentry
, tgid_attr_stuff
);
1881 static struct dentry
*proc_tid_attr_lookup(struct inode
*dir
,
1882 struct dentry
*dentry
, struct nameidata
*nd
)
1884 return proc_pident_lookup(dir
, dentry
, tid_attr_stuff
);
1887 static struct inode_operations proc_tgid_attr_inode_operations
= {
1888 .lookup
= proc_tgid_attr_lookup
,
1889 .getattr
= pid_getattr
,
1892 static struct inode_operations proc_tid_attr_inode_operations
= {
1893 .lookup
= proc_tid_attr_lookup
,
1894 .getattr
= pid_getattr
,
1901 static int proc_self_readlink(struct dentry
*dentry
, char __user
*buffer
,
1904 char tmp
[PROC_NUMBUF
];
1905 sprintf(tmp
, "%d", current
->tgid
);
1906 return vfs_readlink(dentry
,buffer
,buflen
,tmp
);
1909 static void *proc_self_follow_link(struct dentry
*dentry
, struct nameidata
*nd
)
1911 char tmp
[PROC_NUMBUF
];
1912 sprintf(tmp
, "%d", current
->tgid
);
1913 return ERR_PTR(vfs_follow_link(nd
,tmp
));
1916 static struct inode_operations proc_self_inode_operations
= {
1917 .readlink
= proc_self_readlink
,
1918 .follow_link
= proc_self_follow_link
,
1922 * proc_flush_task - Remove dcache entries for @task from the /proc dcache.
1924 * @task: task that should be flushed.
1926 * Looks in the dcache for
1928 * /proc/@tgid/task/@pid
1929 * if either directory is present flushes it and all of it'ts children
1932 * It is safe and reasonable to cache /proc entries for a task until
1933 * that task exits. After that they just clog up the dcache with
1934 * useless entries, possibly causing useful dcache entries to be
1935 * flushed instead. This routine is proved to flush those useless
1936 * dcache entries at process exit time.
1938 * NOTE: This routine is just an optimization so it does not guarantee
1939 * that no dcache entries will exist at process exit time it
1940 * just makes it very unlikely that any will persist.
1942 void proc_flush_task(struct task_struct
*task
)
1944 struct dentry
*dentry
, *leader
, *dir
;
1945 char buf
[PROC_NUMBUF
];
1949 name
.len
= snprintf(buf
, sizeof(buf
), "%d", task
->pid
);
1950 dentry
= d_hash_and_lookup(proc_mnt
->mnt_root
, &name
);
1952 shrink_dcache_parent(dentry
);
1957 if (thread_group_leader(task
))
1961 name
.len
= snprintf(buf
, sizeof(buf
), "%d", task
->tgid
);
1962 leader
= d_hash_and_lookup(proc_mnt
->mnt_root
, &name
);
1967 name
.len
= strlen(name
.name
);
1968 dir
= d_hash_and_lookup(leader
, &name
);
1970 goto out_put_leader
;
1973 name
.len
= snprintf(buf
, sizeof(buf
), "%d", task
->pid
);
1974 dentry
= d_hash_and_lookup(dir
, &name
);
1976 shrink_dcache_parent(dentry
);
1989 struct dentry
*proc_pid_lookup(struct inode
*dir
, struct dentry
* dentry
, struct nameidata
*nd
)
1991 struct dentry
*result
= ERR_PTR(-ENOENT
);
1992 struct task_struct
*task
;
1993 struct inode
*inode
;
1994 struct proc_inode
*ei
;
1997 if (dentry
->d_name
.len
== 4 && !memcmp(dentry
->d_name
.name
,"self",4)) {
1998 inode
= new_inode(dir
->i_sb
);
2000 return ERR_PTR(-ENOMEM
);
2002 inode
->i_mtime
= inode
->i_atime
= inode
->i_ctime
= CURRENT_TIME
;
2003 inode
->i_ino
= fake_ino(0, PROC_TGID_INO
);
2005 inode
->i_mode
= S_IFLNK
|S_IRWXUGO
;
2006 inode
->i_uid
= inode
->i_gid
= 0;
2008 inode
->i_op
= &proc_self_inode_operations
;
2009 d_add(dentry
, inode
);
2012 tgid
= name_to_int(dentry
);
2017 task
= find_task_by_pid(tgid
);
2019 get_task_struct(task
);
2024 inode
= proc_pid_make_inode(dir
->i_sb
, task
, PROC_TGID_INO
);
2028 inode
->i_mode
= S_IFDIR
|S_IRUGO
|S_IXUGO
;
2029 inode
->i_op
= &proc_tgid_base_inode_operations
;
2030 inode
->i_fop
= &proc_tgid_base_operations
;
2031 inode
->i_flags
|=S_IMMUTABLE
;
2032 #ifdef CONFIG_SECURITY
2038 dentry
->d_op
= &pid_dentry_operations
;
2040 d_add(dentry
, inode
);
2041 /* Close the race of the process dying before we return the dentry */
2042 if (pid_revalidate(dentry
, NULL
))
2046 put_task_struct(task
);
2052 static struct dentry
*proc_task_lookup(struct inode
*dir
, struct dentry
* dentry
, struct nameidata
*nd
)
2054 struct dentry
*result
= ERR_PTR(-ENOENT
);
2055 struct task_struct
*task
;
2056 struct task_struct
*leader
= get_proc_task(dir
);
2057 struct inode
*inode
;
2063 tid
= name_to_int(dentry
);
2068 task
= find_task_by_pid(tid
);
2070 get_task_struct(task
);
2074 if (leader
->tgid
!= task
->tgid
)
2077 inode
= proc_pid_make_inode(dir
->i_sb
, task
, PROC_TID_INO
);
2082 inode
->i_mode
= S_IFDIR
|S_IRUGO
|S_IXUGO
;
2083 inode
->i_op
= &proc_tid_base_inode_operations
;
2084 inode
->i_fop
= &proc_tid_base_operations
;
2085 inode
->i_flags
|=S_IMMUTABLE
;
2086 #ifdef CONFIG_SECURITY
2092 dentry
->d_op
= &pid_dentry_operations
;
2094 d_add(dentry
, inode
);
2095 /* Close the race of the process dying before we return the dentry */
2096 if (pid_revalidate(dentry
, NULL
))
2100 put_task_struct(task
);
2102 put_task_struct(leader
);
2108 * Find the first tgid to return to user space.
2110 * Usually this is just whatever follows &init_task, but if the users
2111 * buffer was too small to hold the full list or there was a seek into
2112 * the middle of the directory we have more work to do.
2114 * In the case of a short read we start with find_task_by_pid.
2116 * In the case of a seek we start with &init_task and walk nr
2119 static struct task_struct
*first_tgid(int tgid
, unsigned int nr
)
2121 struct task_struct
*pos
;
2124 pos
= find_task_by_pid(tgid
);
2125 if (pos
&& thread_group_leader(pos
))
2128 /* If nr exceeds the number of processes get out quickly */
2130 if (nr
&& nr
>= nr_processes())
2133 /* If we haven't found our starting place yet start with
2134 * the init_task and walk nr tasks forward.
2136 for (pos
= next_task(&init_task
); nr
> 0; --nr
) {
2137 pos
= next_task(pos
);
2138 if (pos
== &init_task
) {
2144 get_task_struct(pos
);
2151 * Find the next task in the task list.
2152 * Return NULL if we loop or there is any error.
2154 * The reference to the input task_struct is released.
2156 static struct task_struct
*next_tgid(struct task_struct
*start
)
2158 struct task_struct
*pos
;
2161 if (pid_alive(start
))
2162 pos
= next_task(start
);
2163 if (pid_alive(pos
) && (pos
!= &init_task
)) {
2164 get_task_struct(pos
);
2170 put_task_struct(start
);
2174 /* for the /proc/ directory itself, after non-process stuff has been done */
2175 int proc_pid_readdir(struct file
* filp
, void * dirent
, filldir_t filldir
)
2177 char buf
[PROC_NUMBUF
];
2178 unsigned int nr
= filp
->f_pos
- FIRST_PROCESS_ENTRY
;
2179 struct task_struct
*task
;
2183 ino_t ino
= fake_ino(0,PROC_TGID_INO
);
2184 if (filldir(dirent
, "self", 4, filp
->f_pos
, ino
, DT_LNK
) < 0)
2191 /* f_version caches the tgid value that the last readdir call couldn't
2192 * return. lseek aka telldir automagically resets f_version to 0.
2194 tgid
= filp
->f_version
;
2195 filp
->f_version
= 0;
2196 for (task
= first_tgid(tgid
, nr
);
2198 task
= next_tgid(task
), filp
->f_pos
++) {
2202 len
= snprintf(buf
, sizeof(buf
), "%d", tgid
);
2203 ino
= fake_ino(tgid
, PROC_TGID_INO
);
2204 if (filldir(dirent
, buf
, len
, filp
->f_pos
, ino
, DT_DIR
) < 0) {
2205 /* returning this tgid failed, save it as the first
2206 * pid for the next readir call */
2207 filp
->f_version
= tgid
;
2208 put_task_struct(task
);
2216 * Find the first tid of a thread group to return to user space.
2218 * Usually this is just the thread group leader, but if the users
2219 * buffer was too small or there was a seek into the middle of the
2220 * directory we have more work todo.
2222 * In the case of a short read we start with find_task_by_pid.
2224 * In the case of a seek we start with the leader and walk nr
2227 static struct task_struct
*first_tid(struct task_struct
*leader
,
2230 struct task_struct
*pos
= NULL
;
2233 /* Attempt to start with the pid of a thread */
2234 if (tid
&& (nr
> 0)) {
2235 pos
= find_task_by_pid(tid
);
2236 if (pos
&& (pos
->group_leader
!= leader
))
2242 /* If nr exceeds the number of threads there is nothing todo */
2244 if (nr
>= get_nr_threads(leader
))
2248 /* If we haven't found our starting place yet start with the
2249 * leader and walk nr threads forward.
2251 if (!pos
&& (nr
>= 0))
2254 for (; pos
&& pid_alive(pos
); pos
= next_thread(pos
)) {
2257 get_task_struct(pos
);
2267 * Find the next thread in the thread list.
2268 * Return NULL if there is an error or no next thread.
2270 * The reference to the input task_struct is released.
2272 static struct task_struct
*next_tid(struct task_struct
*start
)
2274 struct task_struct
*pos
;
2277 if (pid_alive(start
))
2278 pos
= next_thread(start
);
2279 if (pid_alive(pos
) && (pos
!= start
->group_leader
))
2280 get_task_struct(pos
);
2284 put_task_struct(start
);
2288 /* for the /proc/TGID/task/ directories */
2289 static int proc_task_readdir(struct file
* filp
, void * dirent
, filldir_t filldir
)
2291 char buf
[PROC_NUMBUF
];
2292 struct dentry
*dentry
= filp
->f_dentry
;
2293 struct inode
*inode
= dentry
->d_inode
;
2294 struct task_struct
*leader
= get_proc_task(inode
);
2295 struct task_struct
*task
;
2296 int retval
= -ENOENT
;
2299 unsigned long pos
= filp
->f_pos
; /* avoiding "long long" filp->f_pos */
2308 if (filldir(dirent
, ".", 1, pos
, ino
, DT_DIR
) < 0)
2313 ino
= parent_ino(dentry
);
2314 if (filldir(dirent
, "..", 2, pos
, ino
, DT_DIR
) < 0)
2320 /* f_version caches the tgid value that the last readdir call couldn't
2321 * return. lseek aka telldir automagically resets f_version to 0.
2323 tid
= filp
->f_version
;
2324 filp
->f_version
= 0;
2325 for (task
= first_tid(leader
, tid
, pos
- 2);
2327 task
= next_tid(task
), pos
++) {
2330 len
= snprintf(buf
, sizeof(buf
), "%d", tid
);
2331 ino
= fake_ino(tid
, PROC_TID_INO
);
2332 if (filldir(dirent
, buf
, len
, pos
, ino
, DT_DIR
< 0)) {
2333 /* returning this tgid failed, save it as the first
2334 * pid for the next readir call */
2335 filp
->f_version
= tid
;
2336 put_task_struct(task
);
2342 put_task_struct(leader
);
2347 static int proc_task_getattr(struct vfsmount
*mnt
, struct dentry
*dentry
, struct kstat
*stat
)
2349 struct inode
*inode
= dentry
->d_inode
;
2350 struct task_struct
*p
= get_proc_task(inode
);
2351 generic_fillattr(inode
, stat
);
2355 stat
->nlink
+= get_nr_threads(p
);