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/errno.h>
53 #include <linux/time.h>
54 #include <linux/proc_fs.h>
55 #include <linux/stat.h>
56 #include <linux/init.h>
57 #include <linux/capability.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/mnt_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>
73 #include <linux/poll.h>
74 #include <linux/nsproxy.h>
75 #include <linux/oom.h>
79 * Implementing inode permission operations in /proc is almost
80 * certainly an error. Permission checks need to happen during
81 * each system call not at open time. The reason is that most of
82 * what we wish to check for permissions in /proc varies at runtime.
84 * The classic example of a problem is opening file descriptors
85 * in /proc for a task before it execs a suid executable.
89 /* Worst case buffer size needed for holding an integer. */
90 #define PROC_NUMBUF 13
96 const struct inode_operations
*iop
;
97 const struct file_operations
*fop
;
101 #define NOD(NAME, MODE, IOP, FOP, OP) { \
102 .len = sizeof(NAME) - 1, \
110 #define DIR(NAME, MODE, OTYPE) \
111 NOD(NAME, (S_IFDIR|(MODE)), \
112 &proc_##OTYPE##_inode_operations, &proc_##OTYPE##_operations, \
114 #define LNK(NAME, OTYPE) \
115 NOD(NAME, (S_IFLNK|S_IRWXUGO), \
116 &proc_pid_link_inode_operations, NULL, \
117 { .proc_get_link = &proc_##OTYPE##_link } )
118 #define REG(NAME, MODE, OTYPE) \
119 NOD(NAME, (S_IFREG|(MODE)), NULL, \
120 &proc_##OTYPE##_operations, {})
121 #define INF(NAME, MODE, OTYPE) \
122 NOD(NAME, (S_IFREG|(MODE)), \
123 NULL, &proc_info_file_operations, \
124 { .proc_read = &proc_##OTYPE } )
126 static struct fs_struct
*get_fs_struct(struct task_struct
*task
)
128 struct fs_struct
*fs
;
132 atomic_inc(&fs
->count
);
137 static int get_nr_threads(struct task_struct
*tsk
)
139 /* Must be called with the rcu_read_lock held */
143 if (lock_task_sighand(tsk
, &flags
)) {
144 count
= atomic_read(&tsk
->signal
->count
);
145 unlock_task_sighand(tsk
, &flags
);
150 static int proc_cwd_link(struct inode
*inode
, struct dentry
**dentry
, struct vfsmount
**mnt
)
152 struct task_struct
*task
= get_proc_task(inode
);
153 struct fs_struct
*fs
= NULL
;
154 int result
= -ENOENT
;
157 fs
= get_fs_struct(task
);
158 put_task_struct(task
);
161 read_lock(&fs
->lock
);
162 *mnt
= mntget(fs
->pwdmnt
);
163 *dentry
= dget(fs
->pwd
);
164 read_unlock(&fs
->lock
);
171 static int proc_root_link(struct inode
*inode
, struct dentry
**dentry
, struct vfsmount
**mnt
)
173 struct task_struct
*task
= get_proc_task(inode
);
174 struct fs_struct
*fs
= NULL
;
175 int result
= -ENOENT
;
178 fs
= get_fs_struct(task
);
179 put_task_struct(task
);
182 read_lock(&fs
->lock
);
183 *mnt
= mntget(fs
->rootmnt
);
184 *dentry
= dget(fs
->root
);
185 read_unlock(&fs
->lock
);
192 #define MAY_PTRACE(task) \
193 (task == current || \
194 (task->parent == current && \
195 (task->ptrace & PT_PTRACED) && \
196 (task->state == TASK_STOPPED || task->state == TASK_TRACED) && \
197 security_ptrace(current,task) == 0))
199 static int proc_pid_environ(struct task_struct
*task
, char * buffer
)
202 struct mm_struct
*mm
= get_task_mm(task
);
204 unsigned int len
= mm
->env_end
- mm
->env_start
;
207 res
= access_process_vm(task
, mm
->env_start
, buffer
, len
, 0);
208 if (!ptrace_may_attach(task
))
215 static int proc_pid_cmdline(struct task_struct
*task
, char * buffer
)
219 struct mm_struct
*mm
= get_task_mm(task
);
223 goto out_mm
; /* Shh! No looking before we're done */
225 len
= mm
->arg_end
- mm
->arg_start
;
230 res
= access_process_vm(task
, mm
->arg_start
, buffer
, len
, 0);
232 // If the nul at the end of args has been overwritten, then
233 // assume application is using setproctitle(3).
234 if (res
> 0 && buffer
[res
-1] != '\0' && len
< PAGE_SIZE
) {
235 len
= strnlen(buffer
, res
);
239 len
= mm
->env_end
- mm
->env_start
;
240 if (len
> PAGE_SIZE
- res
)
241 len
= PAGE_SIZE
- res
;
242 res
+= access_process_vm(task
, mm
->env_start
, buffer
+res
, len
, 0);
243 res
= strnlen(buffer
, res
);
252 static int proc_pid_auxv(struct task_struct
*task
, char *buffer
)
255 struct mm_struct
*mm
= get_task_mm(task
);
257 unsigned int nwords
= 0;
260 while (mm
->saved_auxv
[nwords
- 2] != 0); /* AT_NULL */
261 res
= nwords
* sizeof(mm
->saved_auxv
[0]);
264 memcpy(buffer
, mm
->saved_auxv
, res
);
271 #ifdef CONFIG_KALLSYMS
273 * Provides a wchan file via kallsyms in a proper one-value-per-file format.
274 * Returns the resolved symbol. If that fails, simply return the address.
276 static int proc_pid_wchan(struct task_struct
*task
, char *buffer
)
279 const char *sym_name
;
280 unsigned long wchan
, size
, offset
;
281 char namebuf
[KSYM_NAME_LEN
+1];
283 wchan
= get_wchan(task
);
285 sym_name
= kallsyms_lookup(wchan
, &size
, &offset
, &modname
, namebuf
);
287 return sprintf(buffer
, "%s", sym_name
);
288 return sprintf(buffer
, "%lu", wchan
);
290 #endif /* CONFIG_KALLSYMS */
292 #ifdef CONFIG_SCHEDSTATS
294 * Provides /proc/PID/schedstat
296 static int proc_pid_schedstat(struct task_struct
*task
, char *buffer
)
298 return sprintf(buffer
, "%lu %lu %lu\n",
299 task
->sched_info
.cpu_time
,
300 task
->sched_info
.run_delay
,
301 task
->sched_info
.pcnt
);
305 /* The badness from the OOM killer */
306 unsigned long badness(struct task_struct
*p
, unsigned long uptime
);
307 static int proc_oom_score(struct task_struct
*task
, char *buffer
)
309 unsigned long points
;
310 struct timespec uptime
;
312 do_posix_clock_monotonic_gettime(&uptime
);
313 points
= badness(task
, uptime
.tv_sec
);
314 return sprintf(buffer
, "%lu\n", points
);
317 /************************************************************************/
318 /* Here the fs part begins */
319 /************************************************************************/
321 /* permission checks */
322 static int proc_fd_access_allowed(struct inode
*inode
)
324 struct task_struct
*task
;
326 /* Allow access to a task's file descriptors if it is us or we
327 * may use ptrace attach to the process and find out that
330 task
= get_proc_task(inode
);
332 allowed
= ptrace_may_attach(task
);
333 put_task_struct(task
);
338 static int proc_setattr(struct dentry
*dentry
, struct iattr
*attr
)
341 struct inode
*inode
= dentry
->d_inode
;
343 if (attr
->ia_valid
& ATTR_MODE
)
346 error
= inode_change_ok(inode
, attr
);
348 error
= security_inode_setattr(dentry
, attr
);
350 error
= inode_setattr(inode
, attr
);
355 static const struct inode_operations proc_def_inode_operations
= {
356 .setattr
= proc_setattr
,
359 extern struct seq_operations mounts_op
;
365 static int mounts_open(struct inode
*inode
, struct file
*file
)
367 struct task_struct
*task
= get_proc_task(inode
);
368 struct mnt_namespace
*ns
= NULL
;
369 struct proc_mounts
*p
;
375 ns
= task
->nsproxy
->mnt_ns
;
380 put_task_struct(task
);
385 p
= kmalloc(sizeof(struct proc_mounts
), GFP_KERNEL
);
387 file
->private_data
= &p
->m
;
388 ret
= seq_open(file
, &mounts_op
);
391 p
->event
= ns
->event
;
401 static int mounts_release(struct inode
*inode
, struct file
*file
)
403 struct seq_file
*m
= file
->private_data
;
404 struct mnt_namespace
*ns
= m
->private;
406 return seq_release(inode
, file
);
409 static unsigned mounts_poll(struct file
*file
, poll_table
*wait
)
411 struct proc_mounts
*p
= file
->private_data
;
412 struct mnt_namespace
*ns
= p
->m
.private;
415 poll_wait(file
, &ns
->poll
, wait
);
417 spin_lock(&vfsmount_lock
);
418 if (p
->event
!= ns
->event
) {
419 p
->event
= ns
->event
;
422 spin_unlock(&vfsmount_lock
);
427 static const struct file_operations proc_mounts_operations
= {
431 .release
= mounts_release
,
435 extern struct seq_operations mountstats_op
;
436 static int mountstats_open(struct inode
*inode
, struct file
*file
)
438 int ret
= seq_open(file
, &mountstats_op
);
441 struct seq_file
*m
= file
->private_data
;
442 struct mnt_namespace
*mnt_ns
= NULL
;
443 struct task_struct
*task
= get_proc_task(inode
);
448 mnt_ns
= task
->nsproxy
->mnt_ns
;
452 put_task_struct(task
);
458 seq_release(inode
, file
);
465 static const struct file_operations proc_mountstats_operations
= {
466 .open
= mountstats_open
,
469 .release
= mounts_release
,
472 #define PROC_BLOCK_SIZE (3*1024) /* 4K page size but our output routines use some slack for overruns */
474 static ssize_t
proc_info_read(struct file
* file
, char __user
* buf
,
475 size_t count
, loff_t
*ppos
)
477 struct inode
* inode
= file
->f_path
.dentry
->d_inode
;
480 struct task_struct
*task
= get_proc_task(inode
);
486 if (count
> PROC_BLOCK_SIZE
)
487 count
= PROC_BLOCK_SIZE
;
490 if (!(page
= __get_free_page(GFP_KERNEL
)))
493 length
= PROC_I(inode
)->op
.proc_read(task
, (char*)page
);
496 length
= simple_read_from_buffer(buf
, count
, ppos
, (char *)page
, length
);
499 put_task_struct(task
);
504 static const struct file_operations proc_info_file_operations
= {
505 .read
= proc_info_read
,
508 static int mem_open(struct inode
* inode
, struct file
* file
)
510 file
->private_data
= (void*)((long)current
->self_exec_id
);
514 static ssize_t
mem_read(struct file
* file
, char __user
* buf
,
515 size_t count
, loff_t
*ppos
)
517 struct task_struct
*task
= get_proc_task(file
->f_path
.dentry
->d_inode
);
519 unsigned long src
= *ppos
;
521 struct mm_struct
*mm
;
526 if (!MAY_PTRACE(task
) || !ptrace_may_attach(task
))
530 page
= (char *)__get_free_page(GFP_USER
);
536 mm
= get_task_mm(task
);
542 if (file
->private_data
!= (void*)((long)current
->self_exec_id
))
548 int this_len
, retval
;
550 this_len
= (count
> PAGE_SIZE
) ? PAGE_SIZE
: count
;
551 retval
= access_process_vm(task
, src
, page
, this_len
, 0);
552 if (!retval
|| !MAY_PTRACE(task
) || !ptrace_may_attach(task
)) {
558 if (copy_to_user(buf
, page
, retval
)) {
573 free_page((unsigned long) page
);
575 put_task_struct(task
);
580 #define mem_write NULL
583 /* This is a security hazard */
584 static ssize_t
mem_write(struct file
* file
, const char __user
*buf
,
585 size_t count
, loff_t
*ppos
)
589 struct task_struct
*task
= get_proc_task(file
->f_path
.dentry
->d_inode
);
590 unsigned long dst
= *ppos
;
596 if (!MAY_PTRACE(task
) || !ptrace_may_attach(task
))
600 page
= (char *)__get_free_page(GFP_USER
);
606 int this_len
, retval
;
608 this_len
= (count
> PAGE_SIZE
) ? PAGE_SIZE
: count
;
609 if (copy_from_user(page
, buf
, this_len
)) {
613 retval
= access_process_vm(task
, dst
, page
, this_len
, 1);
625 free_page((unsigned long) page
);
627 put_task_struct(task
);
633 static loff_t
mem_lseek(struct file
* file
, loff_t offset
, int orig
)
637 file
->f_pos
= offset
;
640 file
->f_pos
+= offset
;
645 force_successful_syscall_return();
649 static const struct file_operations proc_mem_operations
= {
656 static ssize_t
oom_adjust_read(struct file
*file
, char __user
*buf
,
657 size_t count
, loff_t
*ppos
)
659 struct task_struct
*task
= get_proc_task(file
->f_path
.dentry
->d_inode
);
660 char buffer
[PROC_NUMBUF
];
663 loff_t __ppos
= *ppos
;
667 oom_adjust
= task
->oomkilladj
;
668 put_task_struct(task
);
670 len
= snprintf(buffer
, sizeof(buffer
), "%i\n", oom_adjust
);
673 if (count
> len
-__ppos
)
675 if (copy_to_user(buf
, buffer
+ __ppos
, count
))
677 *ppos
= __ppos
+ count
;
681 static ssize_t
oom_adjust_write(struct file
*file
, const char __user
*buf
,
682 size_t count
, loff_t
*ppos
)
684 struct task_struct
*task
;
685 char buffer
[PROC_NUMBUF
], *end
;
688 memset(buffer
, 0, sizeof(buffer
));
689 if (count
> sizeof(buffer
) - 1)
690 count
= sizeof(buffer
) - 1;
691 if (copy_from_user(buffer
, buf
, count
))
693 oom_adjust
= simple_strtol(buffer
, &end
, 0);
694 if ((oom_adjust
< OOM_ADJUST_MIN
|| oom_adjust
> OOM_ADJUST_MAX
) &&
695 oom_adjust
!= OOM_DISABLE
)
699 task
= get_proc_task(file
->f_path
.dentry
->d_inode
);
702 if (oom_adjust
< task
->oomkilladj
&& !capable(CAP_SYS_RESOURCE
)) {
703 put_task_struct(task
);
706 task
->oomkilladj
= oom_adjust
;
707 put_task_struct(task
);
708 if (end
- buffer
== 0)
713 static const struct file_operations proc_oom_adjust_operations
= {
714 .read
= oom_adjust_read
,
715 .write
= oom_adjust_write
,
718 #ifdef CONFIG_AUDITSYSCALL
720 static ssize_t
proc_loginuid_read(struct file
* file
, char __user
* buf
,
721 size_t count
, loff_t
*ppos
)
723 struct inode
* inode
= file
->f_path
.dentry
->d_inode
;
724 struct task_struct
*task
= get_proc_task(inode
);
726 char tmpbuf
[TMPBUFLEN
];
730 length
= scnprintf(tmpbuf
, TMPBUFLEN
, "%u",
731 audit_get_loginuid(task
->audit_context
));
732 put_task_struct(task
);
733 return simple_read_from_buffer(buf
, count
, ppos
, tmpbuf
, length
);
736 static ssize_t
proc_loginuid_write(struct file
* file
, const char __user
* buf
,
737 size_t count
, loff_t
*ppos
)
739 struct inode
* inode
= file
->f_path
.dentry
->d_inode
;
744 if (!capable(CAP_AUDIT_CONTROL
))
747 if (current
!= pid_task(proc_pid(inode
), PIDTYPE_PID
))
750 if (count
>= PAGE_SIZE
)
751 count
= PAGE_SIZE
- 1;
754 /* No partial writes. */
757 page
= (char*)__get_free_page(GFP_USER
);
761 if (copy_from_user(page
, buf
, count
))
765 loginuid
= simple_strtoul(page
, &tmp
, 10);
771 length
= audit_set_loginuid(current
, loginuid
);
772 if (likely(length
== 0))
776 free_page((unsigned long) page
);
780 static const struct file_operations proc_loginuid_operations
= {
781 .read
= proc_loginuid_read
,
782 .write
= proc_loginuid_write
,
786 #ifdef CONFIG_SECCOMP
787 static ssize_t
seccomp_read(struct file
*file
, char __user
*buf
,
788 size_t count
, loff_t
*ppos
)
790 struct task_struct
*tsk
= get_proc_task(file
->f_dentry
->d_inode
);
792 loff_t __ppos
= *ppos
;
797 /* no need to print the trailing zero, so use only len */
798 len
= sprintf(__buf
, "%u\n", tsk
->seccomp
.mode
);
799 put_task_struct(tsk
);
802 if (count
> len
- __ppos
)
803 count
= len
- __ppos
;
804 if (copy_to_user(buf
, __buf
+ __ppos
, count
))
806 *ppos
= __ppos
+ count
;
810 static ssize_t
seccomp_write(struct file
*file
, const char __user
*buf
,
811 size_t count
, loff_t
*ppos
)
813 struct task_struct
*tsk
= get_proc_task(file
->f_dentry
->d_inode
);
814 char __buf
[20], *end
;
815 unsigned int seccomp_mode
;
822 /* can set it only once to be even more secure */
824 if (unlikely(tsk
->seccomp
.mode
))
828 memset(__buf
, 0, sizeof(__buf
));
829 count
= min(count
, sizeof(__buf
) - 1);
830 if (copy_from_user(__buf
, buf
, count
))
833 seccomp_mode
= simple_strtoul(__buf
, &end
, 0);
837 if (seccomp_mode
&& seccomp_mode
<= NR_SECCOMP_MODES
) {
838 tsk
->seccomp
.mode
= seccomp_mode
;
839 set_tsk_thread_flag(tsk
, TIF_SECCOMP
);
843 if (unlikely(!(end
- __buf
)))
845 result
= end
- __buf
;
847 put_task_struct(tsk
);
852 static const struct file_operations proc_seccomp_operations
= {
853 .read
= seccomp_read
,
854 .write
= seccomp_write
,
856 #endif /* CONFIG_SECCOMP */
858 #ifdef CONFIG_FAULT_INJECTION
859 static ssize_t
proc_fault_inject_read(struct file
* file
, char __user
* buf
,
860 size_t count
, loff_t
*ppos
)
862 struct task_struct
*task
= get_proc_task(file
->f_dentry
->d_inode
);
863 char buffer
[PROC_NUMBUF
];
866 loff_t __ppos
= *ppos
;
870 make_it_fail
= task
->make_it_fail
;
871 put_task_struct(task
);
873 len
= snprintf(buffer
, sizeof(buffer
), "%i\n", make_it_fail
);
876 if (count
> len
-__ppos
)
878 if (copy_to_user(buf
, buffer
+ __ppos
, count
))
880 *ppos
= __ppos
+ count
;
884 static ssize_t
proc_fault_inject_write(struct file
* file
,
885 const char __user
* buf
, size_t count
, loff_t
*ppos
)
887 struct task_struct
*task
;
888 char buffer
[PROC_NUMBUF
], *end
;
891 if (!capable(CAP_SYS_RESOURCE
))
893 memset(buffer
, 0, sizeof(buffer
));
894 if (count
> sizeof(buffer
) - 1)
895 count
= sizeof(buffer
) - 1;
896 if (copy_from_user(buffer
, buf
, count
))
898 make_it_fail
= simple_strtol(buffer
, &end
, 0);
901 task
= get_proc_task(file
->f_dentry
->d_inode
);
904 task
->make_it_fail
= make_it_fail
;
905 put_task_struct(task
);
906 if (end
- buffer
== 0)
911 static const struct file_operations proc_fault_inject_operations
= {
912 .read
= proc_fault_inject_read
,
913 .write
= proc_fault_inject_write
,
917 static void *proc_pid_follow_link(struct dentry
*dentry
, struct nameidata
*nd
)
919 struct inode
*inode
= dentry
->d_inode
;
922 /* We don't need a base pointer in the /proc filesystem */
925 /* Are we allowed to snoop on the tasks file descriptors? */
926 if (!proc_fd_access_allowed(inode
))
929 error
= PROC_I(inode
)->op
.proc_get_link(inode
, &nd
->dentry
, &nd
->mnt
);
930 nd
->last_type
= LAST_BIND
;
932 return ERR_PTR(error
);
935 static int do_proc_readlink(struct dentry
*dentry
, struct vfsmount
*mnt
,
936 char __user
*buffer
, int buflen
)
938 struct inode
* inode
;
939 char *tmp
= (char*)__get_free_page(GFP_KERNEL
), *path
;
945 inode
= dentry
->d_inode
;
946 path
= d_path(dentry
, mnt
, tmp
, PAGE_SIZE
);
950 len
= tmp
+ PAGE_SIZE
- 1 - path
;
954 if (copy_to_user(buffer
, path
, len
))
957 free_page((unsigned long)tmp
);
961 static int proc_pid_readlink(struct dentry
* dentry
, char __user
* buffer
, int buflen
)
964 struct inode
*inode
= dentry
->d_inode
;
966 struct vfsmount
*mnt
= NULL
;
968 /* Are we allowed to snoop on the tasks file descriptors? */
969 if (!proc_fd_access_allowed(inode
))
972 error
= PROC_I(inode
)->op
.proc_get_link(inode
, &de
, &mnt
);
976 error
= do_proc_readlink(de
, mnt
, buffer
, buflen
);
983 static const struct inode_operations proc_pid_link_inode_operations
= {
984 .readlink
= proc_pid_readlink
,
985 .follow_link
= proc_pid_follow_link
,
986 .setattr
= proc_setattr
,
990 /* building an inode */
992 static int task_dumpable(struct task_struct
*task
)
995 struct mm_struct
*mm
;
1000 dumpable
= mm
->dumpable
;
1008 static struct inode
*proc_pid_make_inode(struct super_block
* sb
, struct task_struct
*task
)
1010 struct inode
* inode
;
1011 struct proc_inode
*ei
;
1013 /* We need a new inode */
1015 inode
= new_inode(sb
);
1021 inode
->i_mtime
= inode
->i_atime
= inode
->i_ctime
= CURRENT_TIME
;
1022 inode
->i_op
= &proc_def_inode_operations
;
1025 * grab the reference to task.
1027 ei
->pid
= get_task_pid(task
, PIDTYPE_PID
);
1033 if (task_dumpable(task
)) {
1034 inode
->i_uid
= task
->euid
;
1035 inode
->i_gid
= task
->egid
;
1037 security_task_to_inode(task
, inode
);
1047 static int pid_getattr(struct vfsmount
*mnt
, struct dentry
*dentry
, struct kstat
*stat
)
1049 struct inode
*inode
= dentry
->d_inode
;
1050 struct task_struct
*task
;
1051 generic_fillattr(inode
, stat
);
1056 task
= pid_task(proc_pid(inode
), PIDTYPE_PID
);
1058 if ((inode
->i_mode
== (S_IFDIR
|S_IRUGO
|S_IXUGO
)) ||
1059 task_dumpable(task
)) {
1060 stat
->uid
= task
->euid
;
1061 stat
->gid
= task
->egid
;
1071 * Exceptional case: normally we are not allowed to unhash a busy
1072 * directory. In this case, however, we can do it - no aliasing problems
1073 * due to the way we treat inodes.
1075 * Rewrite the inode's ownerships here because the owning task may have
1076 * performed a setuid(), etc.
1078 * Before the /proc/pid/status file was created the only way to read
1079 * the effective uid of a /process was to stat /proc/pid. Reading
1080 * /proc/pid/status is slow enough that procps and other packages
1081 * kept stating /proc/pid. To keep the rules in /proc simple I have
1082 * made this apply to all per process world readable and executable
1085 static int pid_revalidate(struct dentry
*dentry
, struct nameidata
*nd
)
1087 struct inode
*inode
= dentry
->d_inode
;
1088 struct task_struct
*task
= get_proc_task(inode
);
1090 if ((inode
->i_mode
== (S_IFDIR
|S_IRUGO
|S_IXUGO
)) ||
1091 task_dumpable(task
)) {
1092 inode
->i_uid
= task
->euid
;
1093 inode
->i_gid
= task
->egid
;
1098 inode
->i_mode
&= ~(S_ISUID
| S_ISGID
);
1099 security_task_to_inode(task
, inode
);
1100 put_task_struct(task
);
1107 static int pid_delete_dentry(struct dentry
* dentry
)
1109 /* Is the task we represent dead?
1110 * If so, then don't put the dentry on the lru list,
1111 * kill it immediately.
1113 return !proc_pid(dentry
->d_inode
)->tasks
[PIDTYPE_PID
].first
;
1116 static struct dentry_operations pid_dentry_operations
=
1118 .d_revalidate
= pid_revalidate
,
1119 .d_delete
= pid_delete_dentry
,
1124 typedef struct dentry
*instantiate_t(struct inode
*, struct dentry
*, struct task_struct
*, void *);
1127 * Fill a directory entry.
1129 * If possible create the dcache entry and derive our inode number and
1130 * file type from dcache entry.
1132 * Since all of the proc inode numbers are dynamically generated, the inode
1133 * numbers do not exist until the inode is cache. This means creating the
1134 * the dcache entry in readdir is necessary to keep the inode numbers
1135 * reported by readdir in sync with the inode numbers reported
1138 static int proc_fill_cache(struct file
*filp
, void *dirent
, filldir_t filldir
,
1139 char *name
, int len
,
1140 instantiate_t instantiate
, struct task_struct
*task
, void *ptr
)
1142 struct dentry
*child
, *dir
= filp
->f_path
.dentry
;
1143 struct inode
*inode
;
1146 unsigned type
= DT_UNKNOWN
;
1150 qname
.hash
= full_name_hash(name
, len
);
1152 child
= d_lookup(dir
, &qname
);
1155 new = d_alloc(dir
, &qname
);
1157 child
= instantiate(dir
->d_inode
, new, task
, ptr
);
1164 if (!child
|| IS_ERR(child
) || !child
->d_inode
)
1165 goto end_instantiate
;
1166 inode
= child
->d_inode
;
1169 type
= inode
->i_mode
>> 12;
1174 ino
= find_inode_number(dir
, &qname
);
1177 return filldir(dirent
, name
, len
, filp
->f_pos
, ino
, type
);
1180 static unsigned name_to_int(struct dentry
*dentry
)
1182 const char *name
= dentry
->d_name
.name
;
1183 int len
= dentry
->d_name
.len
;
1186 if (len
> 1 && *name
== '0')
1189 unsigned c
= *name
++ - '0';
1192 if (n
>= (~0U-9)/10)
1202 static int proc_fd_link(struct inode
*inode
, struct dentry
**dentry
, struct vfsmount
**mnt
)
1204 struct task_struct
*task
= get_proc_task(inode
);
1205 struct files_struct
*files
= NULL
;
1207 int fd
= proc_fd(inode
);
1210 files
= get_files_struct(task
);
1211 put_task_struct(task
);
1215 * We are not taking a ref to the file structure, so we must
1218 spin_lock(&files
->file_lock
);
1219 file
= fcheck_files(files
, fd
);
1221 *mnt
= mntget(file
->f_path
.mnt
);
1222 *dentry
= dget(file
->f_path
.dentry
);
1223 spin_unlock(&files
->file_lock
);
1224 put_files_struct(files
);
1227 spin_unlock(&files
->file_lock
);
1228 put_files_struct(files
);
1233 static int tid_fd_revalidate(struct dentry
*dentry
, struct nameidata
*nd
)
1235 struct inode
*inode
= dentry
->d_inode
;
1236 struct task_struct
*task
= get_proc_task(inode
);
1237 int fd
= proc_fd(inode
);
1238 struct files_struct
*files
;
1241 files
= get_files_struct(task
);
1244 if (fcheck_files(files
, fd
)) {
1246 put_files_struct(files
);
1247 if (task_dumpable(task
)) {
1248 inode
->i_uid
= task
->euid
;
1249 inode
->i_gid
= task
->egid
;
1254 inode
->i_mode
&= ~(S_ISUID
| S_ISGID
);
1255 security_task_to_inode(task
, inode
);
1256 put_task_struct(task
);
1260 put_files_struct(files
);
1262 put_task_struct(task
);
1268 static struct dentry_operations tid_fd_dentry_operations
=
1270 .d_revalidate
= tid_fd_revalidate
,
1271 .d_delete
= pid_delete_dentry
,
1274 static struct dentry
*proc_fd_instantiate(struct inode
*dir
,
1275 struct dentry
*dentry
, struct task_struct
*task
, void *ptr
)
1277 unsigned fd
= *(unsigned *)ptr
;
1279 struct files_struct
*files
;
1280 struct inode
*inode
;
1281 struct proc_inode
*ei
;
1282 struct dentry
*error
= ERR_PTR(-ENOENT
);
1284 inode
= proc_pid_make_inode(dir
->i_sb
, task
);
1289 files
= get_files_struct(task
);
1292 inode
->i_mode
= S_IFLNK
;
1295 * We are not taking a ref to the file structure, so we must
1298 spin_lock(&files
->file_lock
);
1299 file
= fcheck_files(files
, fd
);
1302 if (file
->f_mode
& 1)
1303 inode
->i_mode
|= S_IRUSR
| S_IXUSR
;
1304 if (file
->f_mode
& 2)
1305 inode
->i_mode
|= S_IWUSR
| S_IXUSR
;
1306 spin_unlock(&files
->file_lock
);
1307 put_files_struct(files
);
1309 inode
->i_op
= &proc_pid_link_inode_operations
;
1311 ei
->op
.proc_get_link
= proc_fd_link
;
1312 dentry
->d_op
= &tid_fd_dentry_operations
;
1313 d_add(dentry
, inode
);
1314 /* Close the race of the process dying before we return the dentry */
1315 if (tid_fd_revalidate(dentry
, NULL
))
1321 spin_unlock(&files
->file_lock
);
1322 put_files_struct(files
);
1328 static struct dentry
*proc_lookupfd(struct inode
* dir
, struct dentry
* dentry
, struct nameidata
*nd
)
1330 struct task_struct
*task
= get_proc_task(dir
);
1331 unsigned fd
= name_to_int(dentry
);
1332 struct dentry
*result
= ERR_PTR(-ENOENT
);
1339 result
= proc_fd_instantiate(dir
, dentry
, task
, &fd
);
1341 put_task_struct(task
);
1346 static int proc_fd_fill_cache(struct file
*filp
, void *dirent
, filldir_t filldir
,
1347 struct task_struct
*task
, int fd
)
1349 char name
[PROC_NUMBUF
];
1350 int len
= snprintf(name
, sizeof(name
), "%d", fd
);
1351 return proc_fill_cache(filp
, dirent
, filldir
, name
, len
,
1352 proc_fd_instantiate
, task
, &fd
);
1355 static int proc_readfd(struct file
* filp
, void * dirent
, filldir_t filldir
)
1357 struct dentry
*dentry
= filp
->f_path
.dentry
;
1358 struct inode
*inode
= dentry
->d_inode
;
1359 struct task_struct
*p
= get_proc_task(inode
);
1360 unsigned int fd
, tid
, ino
;
1362 struct files_struct
* files
;
1363 struct fdtable
*fdt
;
1374 if (filldir(dirent
, ".", 1, 0, inode
->i_ino
, DT_DIR
) < 0)
1378 ino
= parent_ino(dentry
);
1379 if (filldir(dirent
, "..", 2, 1, ino
, DT_DIR
) < 0)
1383 files
= get_files_struct(p
);
1387 fdt
= files_fdtable(files
);
1388 for (fd
= filp
->f_pos
-2;
1390 fd
++, filp
->f_pos
++) {
1392 if (!fcheck_files(files
, fd
))
1396 if (proc_fd_fill_cache(filp
, dirent
, filldir
, p
, fd
) < 0) {
1403 put_files_struct(files
);
1411 static const struct file_operations proc_fd_operations
= {
1412 .read
= generic_read_dir
,
1413 .readdir
= proc_readfd
,
1417 * proc directories can do almost nothing..
1419 static const struct inode_operations proc_fd_inode_operations
= {
1420 .lookup
= proc_lookupfd
,
1421 .setattr
= proc_setattr
,
1424 static struct dentry
*proc_pident_instantiate(struct inode
*dir
,
1425 struct dentry
*dentry
, struct task_struct
*task
, void *ptr
)
1427 struct pid_entry
*p
= ptr
;
1428 struct inode
*inode
;
1429 struct proc_inode
*ei
;
1430 struct dentry
*error
= ERR_PTR(-EINVAL
);
1432 inode
= proc_pid_make_inode(dir
->i_sb
, task
);
1437 inode
->i_mode
= p
->mode
;
1438 if (S_ISDIR(inode
->i_mode
))
1439 inode
->i_nlink
= 2; /* Use getattr to fix if necessary */
1441 inode
->i_op
= p
->iop
;
1443 inode
->i_fop
= p
->fop
;
1445 dentry
->d_op
= &pid_dentry_operations
;
1446 d_add(dentry
, inode
);
1447 /* Close the race of the process dying before we return the dentry */
1448 if (pid_revalidate(dentry
, NULL
))
1454 static struct dentry
*proc_pident_lookup(struct inode
*dir
,
1455 struct dentry
*dentry
,
1456 struct pid_entry
*ents
,
1459 struct inode
*inode
;
1460 struct dentry
*error
;
1461 struct task_struct
*task
= get_proc_task(dir
);
1462 struct pid_entry
*p
, *last
;
1464 error
= ERR_PTR(-ENOENT
);
1471 * Yes, it does not scale. And it should not. Don't add
1472 * new entries into /proc/<tgid>/ without very good reasons.
1474 last
= &ents
[nents
- 1];
1475 for (p
= ents
; p
<= last
; p
++) {
1476 if (p
->len
!= dentry
->d_name
.len
)
1478 if (!memcmp(dentry
->d_name
.name
, p
->name
, p
->len
))
1484 error
= proc_pident_instantiate(dir
, dentry
, task
, p
);
1486 put_task_struct(task
);
1491 static int proc_pident_fill_cache(struct file
*filp
, void *dirent
, filldir_t filldir
,
1492 struct task_struct
*task
, struct pid_entry
*p
)
1494 return proc_fill_cache(filp
, dirent
, filldir
, p
->name
, p
->len
,
1495 proc_pident_instantiate
, task
, p
);
1498 static int proc_pident_readdir(struct file
*filp
,
1499 void *dirent
, filldir_t filldir
,
1500 struct pid_entry
*ents
, unsigned int nents
)
1504 struct dentry
*dentry
= filp
->f_path
.dentry
;
1505 struct inode
*inode
= dentry
->d_inode
;
1506 struct task_struct
*task
= get_proc_task(inode
);
1507 struct pid_entry
*p
, *last
;
1521 if (filldir(dirent
, ".", 1, i
, ino
, DT_DIR
) < 0)
1527 ino
= parent_ino(dentry
);
1528 if (filldir(dirent
, "..", 2, i
, ino
, DT_DIR
) < 0)
1540 last
= &ents
[nents
- 1];
1542 if (proc_pident_fill_cache(filp
, dirent
, filldir
, task
, p
) < 0)
1551 put_task_struct(task
);
1556 #ifdef CONFIG_SECURITY
1557 static ssize_t
proc_pid_attr_read(struct file
* file
, char __user
* buf
,
1558 size_t count
, loff_t
*ppos
)
1560 struct inode
* inode
= file
->f_path
.dentry
->d_inode
;
1563 struct task_struct
*task
= get_proc_task(inode
);
1569 if (count
> PAGE_SIZE
)
1572 if (!(page
= __get_free_page(GFP_KERNEL
)))
1575 length
= security_getprocattr(task
,
1576 (char*)file
->f_path
.dentry
->d_name
.name
,
1577 (void*)page
, count
);
1579 length
= simple_read_from_buffer(buf
, count
, ppos
, (char *)page
, length
);
1582 put_task_struct(task
);
1587 static ssize_t
proc_pid_attr_write(struct file
* file
, const char __user
* buf
,
1588 size_t count
, loff_t
*ppos
)
1590 struct inode
* inode
= file
->f_path
.dentry
->d_inode
;
1593 struct task_struct
*task
= get_proc_task(inode
);
1598 if (count
> PAGE_SIZE
)
1601 /* No partial writes. */
1607 page
= (char*)__get_free_page(GFP_USER
);
1612 if (copy_from_user(page
, buf
, count
))
1615 length
= security_setprocattr(task
,
1616 (char*)file
->f_path
.dentry
->d_name
.name
,
1617 (void*)page
, count
);
1619 free_page((unsigned long) page
);
1621 put_task_struct(task
);
1626 static const struct file_operations proc_pid_attr_operations
= {
1627 .read
= proc_pid_attr_read
,
1628 .write
= proc_pid_attr_write
,
1631 static struct pid_entry attr_dir_stuff
[] = {
1632 REG("current", S_IRUGO
|S_IWUGO
, pid_attr
),
1633 REG("prev", S_IRUGO
, pid_attr
),
1634 REG("exec", S_IRUGO
|S_IWUGO
, pid_attr
),
1635 REG("fscreate", S_IRUGO
|S_IWUGO
, pid_attr
),
1636 REG("keycreate", S_IRUGO
|S_IWUGO
, pid_attr
),
1637 REG("sockcreate", S_IRUGO
|S_IWUGO
, pid_attr
),
1640 static int proc_attr_dir_readdir(struct file
* filp
,
1641 void * dirent
, filldir_t filldir
)
1643 return proc_pident_readdir(filp
,dirent
,filldir
,
1644 attr_dir_stuff
,ARRAY_SIZE(attr_dir_stuff
));
1647 static const struct file_operations proc_attr_dir_operations
= {
1648 .read
= generic_read_dir
,
1649 .readdir
= proc_attr_dir_readdir
,
1652 static struct dentry
*proc_attr_dir_lookup(struct inode
*dir
,
1653 struct dentry
*dentry
, struct nameidata
*nd
)
1655 return proc_pident_lookup(dir
, dentry
,
1656 attr_dir_stuff
, ARRAY_SIZE(attr_dir_stuff
));
1659 static const struct inode_operations proc_attr_dir_inode_operations
= {
1660 .lookup
= proc_attr_dir_lookup
,
1661 .getattr
= pid_getattr
,
1662 .setattr
= proc_setattr
,
1670 static int proc_self_readlink(struct dentry
*dentry
, char __user
*buffer
,
1673 char tmp
[PROC_NUMBUF
];
1674 sprintf(tmp
, "%d", current
->tgid
);
1675 return vfs_readlink(dentry
,buffer
,buflen
,tmp
);
1678 static void *proc_self_follow_link(struct dentry
*dentry
, struct nameidata
*nd
)
1680 char tmp
[PROC_NUMBUF
];
1681 sprintf(tmp
, "%d", current
->tgid
);
1682 return ERR_PTR(vfs_follow_link(nd
,tmp
));
1685 static const struct inode_operations proc_self_inode_operations
= {
1686 .readlink
= proc_self_readlink
,
1687 .follow_link
= proc_self_follow_link
,
1693 * These are the directory entries in the root directory of /proc
1694 * that properly belong to the /proc filesystem, as they describe
1695 * describe something that is process related.
1697 static struct pid_entry proc_base_stuff
[] = {
1698 NOD("self", S_IFLNK
|S_IRWXUGO
,
1699 &proc_self_inode_operations
, NULL
, {}),
1703 * Exceptional case: normally we are not allowed to unhash a busy
1704 * directory. In this case, however, we can do it - no aliasing problems
1705 * due to the way we treat inodes.
1707 static int proc_base_revalidate(struct dentry
*dentry
, struct nameidata
*nd
)
1709 struct inode
*inode
= dentry
->d_inode
;
1710 struct task_struct
*task
= get_proc_task(inode
);
1712 put_task_struct(task
);
1719 static struct dentry_operations proc_base_dentry_operations
=
1721 .d_revalidate
= proc_base_revalidate
,
1722 .d_delete
= pid_delete_dentry
,
1725 static struct dentry
*proc_base_instantiate(struct inode
*dir
,
1726 struct dentry
*dentry
, struct task_struct
*task
, void *ptr
)
1728 struct pid_entry
*p
= ptr
;
1729 struct inode
*inode
;
1730 struct proc_inode
*ei
;
1731 struct dentry
*error
= ERR_PTR(-EINVAL
);
1733 /* Allocate the inode */
1734 error
= ERR_PTR(-ENOMEM
);
1735 inode
= new_inode(dir
->i_sb
);
1739 /* Initialize the inode */
1741 inode
->i_mtime
= inode
->i_atime
= inode
->i_ctime
= CURRENT_TIME
;
1744 * grab the reference to the task.
1746 ei
->pid
= get_task_pid(task
, PIDTYPE_PID
);
1752 inode
->i_mode
= p
->mode
;
1753 if (S_ISDIR(inode
->i_mode
))
1755 if (S_ISLNK(inode
->i_mode
))
1758 inode
->i_op
= p
->iop
;
1760 inode
->i_fop
= p
->fop
;
1762 dentry
->d_op
= &proc_base_dentry_operations
;
1763 d_add(dentry
, inode
);
1772 static struct dentry
*proc_base_lookup(struct inode
*dir
, struct dentry
*dentry
)
1774 struct dentry
*error
;
1775 struct task_struct
*task
= get_proc_task(dir
);
1776 struct pid_entry
*p
, *last
;
1778 error
= ERR_PTR(-ENOENT
);
1783 /* Lookup the directory entry */
1784 last
= &proc_base_stuff
[ARRAY_SIZE(proc_base_stuff
) - 1];
1785 for (p
= proc_base_stuff
; p
<= last
; p
++) {
1786 if (p
->len
!= dentry
->d_name
.len
)
1788 if (!memcmp(dentry
->d_name
.name
, p
->name
, p
->len
))
1794 error
= proc_base_instantiate(dir
, dentry
, task
, p
);
1797 put_task_struct(task
);
1802 static int proc_base_fill_cache(struct file
*filp
, void *dirent
, filldir_t filldir
,
1803 struct task_struct
*task
, struct pid_entry
*p
)
1805 return proc_fill_cache(filp
, dirent
, filldir
, p
->name
, p
->len
,
1806 proc_base_instantiate
, task
, p
);
1809 #ifdef CONFIG_TASK_IO_ACCOUNTING
1810 static int proc_pid_io_accounting(struct task_struct
*task
, char *buffer
)
1812 return sprintf(buffer
,
1813 #ifdef CONFIG_TASK_XACCT
1819 "read_bytes: %llu\n"
1820 "write_bytes: %llu\n"
1821 "cancelled_write_bytes: %llu\n",
1822 #ifdef CONFIG_TASK_XACCT
1823 (unsigned long long)task
->rchar
,
1824 (unsigned long long)task
->wchar
,
1825 (unsigned long long)task
->syscr
,
1826 (unsigned long long)task
->syscw
,
1828 (unsigned long long)task
->ioac
.read_bytes
,
1829 (unsigned long long)task
->ioac
.write_bytes
,
1830 (unsigned long long)task
->ioac
.cancelled_write_bytes
);
1837 static const struct file_operations proc_task_operations
;
1838 static const struct inode_operations proc_task_inode_operations
;
1840 static struct pid_entry tgid_base_stuff
[] = {
1841 DIR("task", S_IRUGO
|S_IXUGO
, task
),
1842 DIR("fd", S_IRUSR
|S_IXUSR
, fd
),
1843 INF("environ", S_IRUSR
, pid_environ
),
1844 INF("auxv", S_IRUSR
, pid_auxv
),
1845 INF("status", S_IRUGO
, pid_status
),
1846 INF("cmdline", S_IRUGO
, pid_cmdline
),
1847 INF("stat", S_IRUGO
, tgid_stat
),
1848 INF("statm", S_IRUGO
, pid_statm
),
1849 REG("maps", S_IRUGO
, maps
),
1851 REG("numa_maps", S_IRUGO
, numa_maps
),
1853 REG("mem", S_IRUSR
|S_IWUSR
, mem
),
1854 #ifdef CONFIG_SECCOMP
1855 REG("seccomp", S_IRUSR
|S_IWUSR
, seccomp
),
1860 REG("mounts", S_IRUGO
, mounts
),
1861 REG("mountstats", S_IRUSR
, mountstats
),
1863 REG("smaps", S_IRUGO
, smaps
),
1865 #ifdef CONFIG_SECURITY
1866 DIR("attr", S_IRUGO
|S_IXUGO
, attr_dir
),
1868 #ifdef CONFIG_KALLSYMS
1869 INF("wchan", S_IRUGO
, pid_wchan
),
1871 #ifdef CONFIG_SCHEDSTATS
1872 INF("schedstat", S_IRUGO
, pid_schedstat
),
1874 #ifdef CONFIG_CPUSETS
1875 REG("cpuset", S_IRUGO
, cpuset
),
1877 INF("oom_score", S_IRUGO
, oom_score
),
1878 REG("oom_adj", S_IRUGO
|S_IWUSR
, oom_adjust
),
1879 #ifdef CONFIG_AUDITSYSCALL
1880 REG("loginuid", S_IWUSR
|S_IRUGO
, loginuid
),
1882 #ifdef CONFIG_FAULT_INJECTION
1883 REG("make-it-fail", S_IRUGO
|S_IWUSR
, fault_inject
),
1885 #ifdef CONFIG_TASK_IO_ACCOUNTING
1886 INF("io", S_IRUGO
, pid_io_accounting
),
1890 static int proc_tgid_base_readdir(struct file
* filp
,
1891 void * dirent
, filldir_t filldir
)
1893 return proc_pident_readdir(filp
,dirent
,filldir
,
1894 tgid_base_stuff
,ARRAY_SIZE(tgid_base_stuff
));
1897 static const struct file_operations proc_tgid_base_operations
= {
1898 .read
= generic_read_dir
,
1899 .readdir
= proc_tgid_base_readdir
,
1902 static struct dentry
*proc_tgid_base_lookup(struct inode
*dir
, struct dentry
*dentry
, struct nameidata
*nd
){
1903 return proc_pident_lookup(dir
, dentry
,
1904 tgid_base_stuff
, ARRAY_SIZE(tgid_base_stuff
));
1907 static const struct inode_operations proc_tgid_base_inode_operations
= {
1908 .lookup
= proc_tgid_base_lookup
,
1909 .getattr
= pid_getattr
,
1910 .setattr
= proc_setattr
,
1914 * proc_flush_task - Remove dcache entries for @task from the /proc dcache.
1916 * @task: task that should be flushed.
1918 * Looks in the dcache for
1920 * /proc/@tgid/task/@pid
1921 * if either directory is present flushes it and all of it'ts children
1924 * It is safe and reasonable to cache /proc entries for a task until
1925 * that task exits. After that they just clog up the dcache with
1926 * useless entries, possibly causing useful dcache entries to be
1927 * flushed instead. This routine is proved to flush those useless
1928 * dcache entries at process exit time.
1930 * NOTE: This routine is just an optimization so it does not guarantee
1931 * that no dcache entries will exist at process exit time it
1932 * just makes it very unlikely that any will persist.
1934 void proc_flush_task(struct task_struct
*task
)
1936 struct dentry
*dentry
, *leader
, *dir
;
1937 char buf
[PROC_NUMBUF
];
1941 name
.len
= snprintf(buf
, sizeof(buf
), "%d", task
->pid
);
1942 dentry
= d_hash_and_lookup(proc_mnt
->mnt_root
, &name
);
1944 shrink_dcache_parent(dentry
);
1949 if (thread_group_leader(task
))
1953 name
.len
= snprintf(buf
, sizeof(buf
), "%d", task
->tgid
);
1954 leader
= d_hash_and_lookup(proc_mnt
->mnt_root
, &name
);
1959 name
.len
= strlen(name
.name
);
1960 dir
= d_hash_and_lookup(leader
, &name
);
1962 goto out_put_leader
;
1965 name
.len
= snprintf(buf
, sizeof(buf
), "%d", task
->pid
);
1966 dentry
= d_hash_and_lookup(dir
, &name
);
1968 shrink_dcache_parent(dentry
);
1980 static struct dentry
*proc_pid_instantiate(struct inode
*dir
,
1981 struct dentry
* dentry
,
1982 struct task_struct
*task
, void *ptr
)
1984 struct dentry
*error
= ERR_PTR(-ENOENT
);
1985 struct inode
*inode
;
1987 inode
= proc_pid_make_inode(dir
->i_sb
, task
);
1991 inode
->i_mode
= S_IFDIR
|S_IRUGO
|S_IXUGO
;
1992 inode
->i_op
= &proc_tgid_base_inode_operations
;
1993 inode
->i_fop
= &proc_tgid_base_operations
;
1994 inode
->i_flags
|=S_IMMUTABLE
;
1996 #ifdef CONFIG_SECURITY
1997 inode
->i_nlink
+= 1;
2000 dentry
->d_op
= &pid_dentry_operations
;
2002 d_add(dentry
, inode
);
2003 /* Close the race of the process dying before we return the dentry */
2004 if (pid_revalidate(dentry
, NULL
))
2010 struct dentry
*proc_pid_lookup(struct inode
*dir
, struct dentry
* dentry
, struct nameidata
*nd
)
2012 struct dentry
*result
= ERR_PTR(-ENOENT
);
2013 struct task_struct
*task
;
2016 result
= proc_base_lookup(dir
, dentry
);
2017 if (!IS_ERR(result
) || PTR_ERR(result
) != -ENOENT
)
2020 tgid
= name_to_int(dentry
);
2025 task
= find_task_by_pid(tgid
);
2027 get_task_struct(task
);
2032 result
= proc_pid_instantiate(dir
, dentry
, task
, NULL
);
2033 put_task_struct(task
);
2039 * Find the first task with tgid >= tgid
2042 static struct task_struct
*next_tgid(unsigned int tgid
)
2044 struct task_struct
*task
;
2050 pid
= find_ge_pid(tgid
);
2053 task
= pid_task(pid
, PIDTYPE_PID
);
2054 /* What we to know is if the pid we have find is the
2055 * pid of a thread_group_leader. Testing for task
2056 * being a thread_group_leader is the obvious thing
2057 * todo but there is a window when it fails, due to
2058 * the pid transfer logic in de_thread.
2060 * So we perform the straight forward test of seeing
2061 * if the pid we have found is the pid of a thread
2062 * group leader, and don't worry if the task we have
2063 * found doesn't happen to be a thread group leader.
2064 * As we don't care in the case of readdir.
2066 if (!task
|| !has_group_leader_pid(task
))
2068 get_task_struct(task
);
2074 #define TGID_OFFSET (FIRST_PROCESS_ENTRY + ARRAY_SIZE(proc_base_stuff))
2076 static int proc_pid_fill_cache(struct file
*filp
, void *dirent
, filldir_t filldir
,
2077 struct task_struct
*task
, int tgid
)
2079 char name
[PROC_NUMBUF
];
2080 int len
= snprintf(name
, sizeof(name
), "%d", tgid
);
2081 return proc_fill_cache(filp
, dirent
, filldir
, name
, len
,
2082 proc_pid_instantiate
, task
, NULL
);
2085 /* for the /proc/ directory itself, after non-process stuff has been done */
2086 int proc_pid_readdir(struct file
* filp
, void * dirent
, filldir_t filldir
)
2088 unsigned int nr
= filp
->f_pos
- FIRST_PROCESS_ENTRY
;
2089 struct task_struct
*reaper
= get_proc_task(filp
->f_path
.dentry
->d_inode
);
2090 struct task_struct
*task
;
2096 for (; nr
< ARRAY_SIZE(proc_base_stuff
); filp
->f_pos
++, nr
++) {
2097 struct pid_entry
*p
= &proc_base_stuff
[nr
];
2098 if (proc_base_fill_cache(filp
, dirent
, filldir
, reaper
, p
) < 0)
2102 tgid
= filp
->f_pos
- TGID_OFFSET
;
2103 for (task
= next_tgid(tgid
);
2105 put_task_struct(task
), task
= next_tgid(tgid
+ 1)) {
2107 filp
->f_pos
= tgid
+ TGID_OFFSET
;
2108 if (proc_pid_fill_cache(filp
, dirent
, filldir
, task
, tgid
) < 0) {
2109 put_task_struct(task
);
2113 filp
->f_pos
= PID_MAX_LIMIT
+ TGID_OFFSET
;
2115 put_task_struct(reaper
);
2123 static struct pid_entry tid_base_stuff
[] = {
2124 DIR("fd", S_IRUSR
|S_IXUSR
, fd
),
2125 INF("environ", S_IRUSR
, pid_environ
),
2126 INF("auxv", S_IRUSR
, pid_auxv
),
2127 INF("status", S_IRUGO
, pid_status
),
2128 INF("cmdline", S_IRUGO
, pid_cmdline
),
2129 INF("stat", S_IRUGO
, tid_stat
),
2130 INF("statm", S_IRUGO
, pid_statm
),
2131 REG("maps", S_IRUGO
, maps
),
2133 REG("numa_maps", S_IRUGO
, numa_maps
),
2135 REG("mem", S_IRUSR
|S_IWUSR
, mem
),
2136 #ifdef CONFIG_SECCOMP
2137 REG("seccomp", S_IRUSR
|S_IWUSR
, seccomp
),
2142 REG("mounts", S_IRUGO
, mounts
),
2144 REG("smaps", S_IRUGO
, smaps
),
2146 #ifdef CONFIG_SECURITY
2147 DIR("attr", S_IRUGO
|S_IXUGO
, attr_dir
),
2149 #ifdef CONFIG_KALLSYMS
2150 INF("wchan", S_IRUGO
, pid_wchan
),
2152 #ifdef CONFIG_SCHEDSTATS
2153 INF("schedstat", S_IRUGO
, pid_schedstat
),
2155 #ifdef CONFIG_CPUSETS
2156 REG("cpuset", S_IRUGO
, cpuset
),
2158 INF("oom_score", S_IRUGO
, oom_score
),
2159 REG("oom_adj", S_IRUGO
|S_IWUSR
, oom_adjust
),
2160 #ifdef CONFIG_AUDITSYSCALL
2161 REG("loginuid", S_IWUSR
|S_IRUGO
, loginuid
),
2163 #ifdef CONFIG_FAULT_INJECTION
2164 REG("make-it-fail", S_IRUGO
|S_IWUSR
, fault_inject
),
2168 static int proc_tid_base_readdir(struct file
* filp
,
2169 void * dirent
, filldir_t filldir
)
2171 return proc_pident_readdir(filp
,dirent
,filldir
,
2172 tid_base_stuff
,ARRAY_SIZE(tid_base_stuff
));
2175 static struct dentry
*proc_tid_base_lookup(struct inode
*dir
, struct dentry
*dentry
, struct nameidata
*nd
){
2176 return proc_pident_lookup(dir
, dentry
,
2177 tid_base_stuff
, ARRAY_SIZE(tid_base_stuff
));
2180 static const struct file_operations proc_tid_base_operations
= {
2181 .read
= generic_read_dir
,
2182 .readdir
= proc_tid_base_readdir
,
2185 static const struct inode_operations proc_tid_base_inode_operations
= {
2186 .lookup
= proc_tid_base_lookup
,
2187 .getattr
= pid_getattr
,
2188 .setattr
= proc_setattr
,
2191 static struct dentry
*proc_task_instantiate(struct inode
*dir
,
2192 struct dentry
*dentry
, struct task_struct
*task
, void *ptr
)
2194 struct dentry
*error
= ERR_PTR(-ENOENT
);
2195 struct inode
*inode
;
2196 inode
= proc_pid_make_inode(dir
->i_sb
, task
);
2200 inode
->i_mode
= S_IFDIR
|S_IRUGO
|S_IXUGO
;
2201 inode
->i_op
= &proc_tid_base_inode_operations
;
2202 inode
->i_fop
= &proc_tid_base_operations
;
2203 inode
->i_flags
|=S_IMMUTABLE
;
2205 #ifdef CONFIG_SECURITY
2206 inode
->i_nlink
+= 1;
2209 dentry
->d_op
= &pid_dentry_operations
;
2211 d_add(dentry
, inode
);
2212 /* Close the race of the process dying before we return the dentry */
2213 if (pid_revalidate(dentry
, NULL
))
2219 static struct dentry
*proc_task_lookup(struct inode
*dir
, struct dentry
* dentry
, struct nameidata
*nd
)
2221 struct dentry
*result
= ERR_PTR(-ENOENT
);
2222 struct task_struct
*task
;
2223 struct task_struct
*leader
= get_proc_task(dir
);
2229 tid
= name_to_int(dentry
);
2234 task
= find_task_by_pid(tid
);
2236 get_task_struct(task
);
2240 if (leader
->tgid
!= task
->tgid
)
2243 result
= proc_task_instantiate(dir
, dentry
, task
, NULL
);
2245 put_task_struct(task
);
2247 put_task_struct(leader
);
2253 * Find the first tid of a thread group to return to user space.
2255 * Usually this is just the thread group leader, but if the users
2256 * buffer was too small or there was a seek into the middle of the
2257 * directory we have more work todo.
2259 * In the case of a short read we start with find_task_by_pid.
2261 * In the case of a seek we start with the leader and walk nr
2264 static struct task_struct
*first_tid(struct task_struct
*leader
,
2267 struct task_struct
*pos
;
2270 /* Attempt to start with the pid of a thread */
2271 if (tid
&& (nr
> 0)) {
2272 pos
= find_task_by_pid(tid
);
2273 if (pos
&& (pos
->group_leader
== leader
))
2277 /* If nr exceeds the number of threads there is nothing todo */
2279 if (nr
&& nr
>= get_nr_threads(leader
))
2282 /* If we haven't found our starting place yet start
2283 * with the leader and walk nr threads forward.
2285 for (pos
= leader
; nr
> 0; --nr
) {
2286 pos
= next_thread(pos
);
2287 if (pos
== leader
) {
2293 get_task_struct(pos
);
2300 * Find the next thread in the thread list.
2301 * Return NULL if there is an error or no next thread.
2303 * The reference to the input task_struct is released.
2305 static struct task_struct
*next_tid(struct task_struct
*start
)
2307 struct task_struct
*pos
= NULL
;
2309 if (pid_alive(start
)) {
2310 pos
= next_thread(start
);
2311 if (thread_group_leader(pos
))
2314 get_task_struct(pos
);
2317 put_task_struct(start
);
2321 static int proc_task_fill_cache(struct file
*filp
, void *dirent
, filldir_t filldir
,
2322 struct task_struct
*task
, int tid
)
2324 char name
[PROC_NUMBUF
];
2325 int len
= snprintf(name
, sizeof(name
), "%d", tid
);
2326 return proc_fill_cache(filp
, dirent
, filldir
, name
, len
,
2327 proc_task_instantiate
, task
, NULL
);
2330 /* for the /proc/TGID/task/ directories */
2331 static int proc_task_readdir(struct file
* filp
, void * dirent
, filldir_t filldir
)
2333 struct dentry
*dentry
= filp
->f_path
.dentry
;
2334 struct inode
*inode
= dentry
->d_inode
;
2335 struct task_struct
*leader
= NULL
;
2336 struct task_struct
*task
;
2337 int retval
= -ENOENT
;
2340 unsigned long pos
= filp
->f_pos
; /* avoiding "long long" filp->f_pos */
2342 task
= get_proc_task(inode
);
2346 if (pid_alive(task
)) {
2347 leader
= task
->group_leader
;
2348 get_task_struct(leader
);
2351 put_task_struct(task
);
2359 if (filldir(dirent
, ".", 1, pos
, ino
, DT_DIR
) < 0)
2364 ino
= parent_ino(dentry
);
2365 if (filldir(dirent
, "..", 2, pos
, ino
, DT_DIR
) < 0)
2371 /* f_version caches the tgid value that the last readdir call couldn't
2372 * return. lseek aka telldir automagically resets f_version to 0.
2374 tid
= filp
->f_version
;
2375 filp
->f_version
= 0;
2376 for (task
= first_tid(leader
, tid
, pos
- 2);
2378 task
= next_tid(task
), pos
++) {
2380 if (proc_task_fill_cache(filp
, dirent
, filldir
, task
, tid
) < 0) {
2381 /* returning this tgid failed, save it as the first
2382 * pid for the next readir call */
2383 filp
->f_version
= tid
;
2384 put_task_struct(task
);
2390 put_task_struct(leader
);
2395 static int proc_task_getattr(struct vfsmount
*mnt
, struct dentry
*dentry
, struct kstat
*stat
)
2397 struct inode
*inode
= dentry
->d_inode
;
2398 struct task_struct
*p
= get_proc_task(inode
);
2399 generic_fillattr(inode
, stat
);
2403 stat
->nlink
+= get_nr_threads(p
);
2411 static const struct inode_operations proc_task_inode_operations
= {
2412 .lookup
= proc_task_lookup
,
2413 .getattr
= proc_task_getattr
,
2414 .setattr
= proc_setattr
,
2417 static const struct file_operations proc_task_operations
= {
2418 .read
= generic_read_dir
,
2419 .readdir
= proc_task_readdir
,