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/rcupdate.h>
65 #include <linux/kallsyms.h>
66 #include <linux/module.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) { \
103 .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 } )
127 EXPORT_SYMBOL(maps_protect
);
129 static struct fs_struct
*get_fs_struct(struct task_struct
*task
)
131 struct fs_struct
*fs
;
135 atomic_inc(&fs
->count
);
140 static int get_nr_threads(struct task_struct
*tsk
)
142 /* Must be called with the rcu_read_lock held */
146 if (lock_task_sighand(tsk
, &flags
)) {
147 count
= atomic_read(&tsk
->signal
->count
);
148 unlock_task_sighand(tsk
, &flags
);
153 static int proc_cwd_link(struct inode
*inode
, struct dentry
**dentry
, struct vfsmount
**mnt
)
155 struct task_struct
*task
= get_proc_task(inode
);
156 struct fs_struct
*fs
= NULL
;
157 int result
= -ENOENT
;
160 fs
= get_fs_struct(task
);
161 put_task_struct(task
);
164 read_lock(&fs
->lock
);
165 *mnt
= mntget(fs
->pwdmnt
);
166 *dentry
= dget(fs
->pwd
);
167 read_unlock(&fs
->lock
);
174 static int proc_root_link(struct inode
*inode
, struct dentry
**dentry
, struct vfsmount
**mnt
)
176 struct task_struct
*task
= get_proc_task(inode
);
177 struct fs_struct
*fs
= NULL
;
178 int result
= -ENOENT
;
181 fs
= get_fs_struct(task
);
182 put_task_struct(task
);
185 read_lock(&fs
->lock
);
186 *mnt
= mntget(fs
->rootmnt
);
187 *dentry
= dget(fs
->root
);
188 read_unlock(&fs
->lock
);
195 #define MAY_PTRACE(task) \
196 (task == current || \
197 (task->parent == current && \
198 (task->ptrace & PT_PTRACED) && \
199 (task->state == TASK_STOPPED || task->state == TASK_TRACED) && \
200 security_ptrace(current,task) == 0))
202 static int proc_pid_environ(struct task_struct
*task
, char * buffer
)
205 struct mm_struct
*mm
= get_task_mm(task
);
210 if (!ptrace_may_attach(task
))
213 len
= mm
->env_end
- mm
->env_start
;
216 res
= access_process_vm(task
, mm
->env_start
, buffer
, len
, 0);
223 static int proc_pid_cmdline(struct task_struct
*task
, char * buffer
)
227 struct mm_struct
*mm
= get_task_mm(task
);
231 goto out_mm
; /* Shh! No looking before we're done */
233 len
= mm
->arg_end
- mm
->arg_start
;
238 res
= access_process_vm(task
, mm
->arg_start
, buffer
, len
, 0);
240 // If the nul at the end of args has been overwritten, then
241 // assume application is using setproctitle(3).
242 if (res
> 0 && buffer
[res
-1] != '\0' && len
< PAGE_SIZE
) {
243 len
= strnlen(buffer
, res
);
247 len
= mm
->env_end
- mm
->env_start
;
248 if (len
> PAGE_SIZE
- res
)
249 len
= PAGE_SIZE
- res
;
250 res
+= access_process_vm(task
, mm
->env_start
, buffer
+res
, len
, 0);
251 res
= strnlen(buffer
, res
);
260 static int proc_pid_auxv(struct task_struct
*task
, char *buffer
)
263 struct mm_struct
*mm
= get_task_mm(task
);
265 unsigned int nwords
= 0;
268 while (mm
->saved_auxv
[nwords
- 2] != 0); /* AT_NULL */
269 res
= nwords
* sizeof(mm
->saved_auxv
[0]);
272 memcpy(buffer
, mm
->saved_auxv
, res
);
279 #ifdef CONFIG_KALLSYMS
281 * Provides a wchan file via kallsyms in a proper one-value-per-file format.
282 * Returns the resolved symbol. If that fails, simply return the address.
284 static int proc_pid_wchan(struct task_struct
*task
, char *buffer
)
287 char symname
[KSYM_NAME_LEN
+1];
289 wchan
= get_wchan(task
);
291 if (lookup_symbol_name(wchan
, symname
) < 0)
292 return sprintf(buffer
, "%lu", wchan
);
294 return sprintf(buffer
, "%s", symname
);
296 #endif /* CONFIG_KALLSYMS */
298 #ifdef CONFIG_SCHEDSTATS
300 * Provides /proc/PID/schedstat
302 static int proc_pid_schedstat(struct task_struct
*task
, char *buffer
)
304 return sprintf(buffer
, "%llu %llu %lu\n",
305 task
->sched_info
.cpu_time
,
306 task
->sched_info
.run_delay
,
307 task
->sched_info
.pcnt
);
311 /* The badness from the OOM killer */
312 unsigned long badness(struct task_struct
*p
, unsigned long uptime
);
313 static int proc_oom_score(struct task_struct
*task
, char *buffer
)
315 unsigned long points
;
316 struct timespec uptime
;
318 do_posix_clock_monotonic_gettime(&uptime
);
319 read_lock(&tasklist_lock
);
320 points
= badness(task
, uptime
.tv_sec
);
321 read_unlock(&tasklist_lock
);
322 return sprintf(buffer
, "%lu\n", points
);
325 /************************************************************************/
326 /* Here the fs part begins */
327 /************************************************************************/
329 /* permission checks */
330 static int proc_fd_access_allowed(struct inode
*inode
)
332 struct task_struct
*task
;
334 /* Allow access to a task's file descriptors if it is us or we
335 * may use ptrace attach to the process and find out that
338 task
= get_proc_task(inode
);
340 allowed
= ptrace_may_attach(task
);
341 put_task_struct(task
);
346 static int proc_setattr(struct dentry
*dentry
, struct iattr
*attr
)
349 struct inode
*inode
= dentry
->d_inode
;
351 if (attr
->ia_valid
& ATTR_MODE
)
354 error
= inode_change_ok(inode
, attr
);
356 error
= inode_setattr(inode
, attr
);
360 static const struct inode_operations proc_def_inode_operations
= {
361 .setattr
= proc_setattr
,
364 extern struct seq_operations mounts_op
;
370 static int mounts_open(struct inode
*inode
, struct file
*file
)
372 struct task_struct
*task
= get_proc_task(inode
);
373 struct mnt_namespace
*ns
= NULL
;
374 struct proc_mounts
*p
;
380 ns
= task
->nsproxy
->mnt_ns
;
385 put_task_struct(task
);
390 p
= kmalloc(sizeof(struct proc_mounts
), GFP_KERNEL
);
392 file
->private_data
= &p
->m
;
393 ret
= seq_open(file
, &mounts_op
);
396 p
->event
= ns
->event
;
406 static int mounts_release(struct inode
*inode
, struct file
*file
)
408 struct seq_file
*m
= file
->private_data
;
409 struct mnt_namespace
*ns
= m
->private;
411 return seq_release(inode
, file
);
414 static unsigned mounts_poll(struct file
*file
, poll_table
*wait
)
416 struct proc_mounts
*p
= file
->private_data
;
417 struct mnt_namespace
*ns
= p
->m
.private;
420 poll_wait(file
, &ns
->poll
, wait
);
422 spin_lock(&vfsmount_lock
);
423 if (p
->event
!= ns
->event
) {
424 p
->event
= ns
->event
;
427 spin_unlock(&vfsmount_lock
);
432 static const struct file_operations proc_mounts_operations
= {
436 .release
= mounts_release
,
440 extern struct seq_operations mountstats_op
;
441 static int mountstats_open(struct inode
*inode
, struct file
*file
)
443 int ret
= seq_open(file
, &mountstats_op
);
446 struct seq_file
*m
= file
->private_data
;
447 struct mnt_namespace
*mnt_ns
= NULL
;
448 struct task_struct
*task
= get_proc_task(inode
);
453 mnt_ns
= task
->nsproxy
->mnt_ns
;
457 put_task_struct(task
);
463 seq_release(inode
, file
);
470 static const struct file_operations proc_mountstats_operations
= {
471 .open
= mountstats_open
,
474 .release
= mounts_release
,
477 #define PROC_BLOCK_SIZE (3*1024) /* 4K page size but our output routines use some slack for overruns */
479 static ssize_t
proc_info_read(struct file
* file
, char __user
* buf
,
480 size_t count
, loff_t
*ppos
)
482 struct inode
* inode
= file
->f_path
.dentry
->d_inode
;
485 struct task_struct
*task
= get_proc_task(inode
);
491 if (count
> PROC_BLOCK_SIZE
)
492 count
= PROC_BLOCK_SIZE
;
495 if (!(page
= __get_free_page(GFP_KERNEL
)))
498 length
= PROC_I(inode
)->op
.proc_read(task
, (char*)page
);
501 length
= simple_read_from_buffer(buf
, count
, ppos
, (char *)page
, length
);
504 put_task_struct(task
);
509 static const struct file_operations proc_info_file_operations
= {
510 .read
= proc_info_read
,
513 static int mem_open(struct inode
* inode
, struct file
* file
)
515 file
->private_data
= (void*)((long)current
->self_exec_id
);
519 static ssize_t
mem_read(struct file
* file
, char __user
* buf
,
520 size_t count
, loff_t
*ppos
)
522 struct task_struct
*task
= get_proc_task(file
->f_path
.dentry
->d_inode
);
524 unsigned long src
= *ppos
;
526 struct mm_struct
*mm
;
531 if (!MAY_PTRACE(task
) || !ptrace_may_attach(task
))
535 page
= (char *)__get_free_page(GFP_USER
);
541 mm
= get_task_mm(task
);
547 if (file
->private_data
!= (void*)((long)current
->self_exec_id
))
553 int this_len
, retval
;
555 this_len
= (count
> PAGE_SIZE
) ? PAGE_SIZE
: count
;
556 retval
= access_process_vm(task
, src
, page
, this_len
, 0);
557 if (!retval
|| !MAY_PTRACE(task
) || !ptrace_may_attach(task
)) {
563 if (copy_to_user(buf
, page
, retval
)) {
578 free_page((unsigned long) page
);
580 put_task_struct(task
);
585 #define mem_write NULL
588 /* This is a security hazard */
589 static ssize_t
mem_write(struct file
* file
, const char __user
*buf
,
590 size_t count
, loff_t
*ppos
)
594 struct task_struct
*task
= get_proc_task(file
->f_path
.dentry
->d_inode
);
595 unsigned long dst
= *ppos
;
601 if (!MAY_PTRACE(task
) || !ptrace_may_attach(task
))
605 page
= (char *)__get_free_page(GFP_USER
);
611 int this_len
, retval
;
613 this_len
= (count
> PAGE_SIZE
) ? PAGE_SIZE
: count
;
614 if (copy_from_user(page
, buf
, this_len
)) {
618 retval
= access_process_vm(task
, dst
, page
, this_len
, 1);
630 free_page((unsigned long) page
);
632 put_task_struct(task
);
638 static loff_t
mem_lseek(struct file
* file
, loff_t offset
, int orig
)
642 file
->f_pos
= offset
;
645 file
->f_pos
+= offset
;
650 force_successful_syscall_return();
654 static const struct file_operations proc_mem_operations
= {
661 static ssize_t
oom_adjust_read(struct file
*file
, char __user
*buf
,
662 size_t count
, loff_t
*ppos
)
664 struct task_struct
*task
= get_proc_task(file
->f_path
.dentry
->d_inode
);
665 char buffer
[PROC_NUMBUF
];
671 oom_adjust
= task
->oomkilladj
;
672 put_task_struct(task
);
674 len
= snprintf(buffer
, sizeof(buffer
), "%i\n", oom_adjust
);
676 return simple_read_from_buffer(buf
, count
, ppos
, buffer
, len
);
679 static ssize_t
oom_adjust_write(struct file
*file
, const char __user
*buf
,
680 size_t count
, loff_t
*ppos
)
682 struct task_struct
*task
;
683 char buffer
[PROC_NUMBUF
], *end
;
686 memset(buffer
, 0, sizeof(buffer
));
687 if (count
> sizeof(buffer
) - 1)
688 count
= sizeof(buffer
) - 1;
689 if (copy_from_user(buffer
, buf
, count
))
691 oom_adjust
= simple_strtol(buffer
, &end
, 0);
692 if ((oom_adjust
< OOM_ADJUST_MIN
|| oom_adjust
> OOM_ADJUST_MAX
) &&
693 oom_adjust
!= OOM_DISABLE
)
697 task
= get_proc_task(file
->f_path
.dentry
->d_inode
);
700 if (oom_adjust
< task
->oomkilladj
&& !capable(CAP_SYS_RESOURCE
)) {
701 put_task_struct(task
);
704 task
->oomkilladj
= oom_adjust
;
705 put_task_struct(task
);
706 if (end
- buffer
== 0)
711 static const struct file_operations proc_oom_adjust_operations
= {
712 .read
= oom_adjust_read
,
713 .write
= oom_adjust_write
,
717 static ssize_t
clear_refs_write(struct file
*file
, const char __user
*buf
,
718 size_t count
, loff_t
*ppos
)
720 struct task_struct
*task
;
721 char buffer
[PROC_NUMBUF
], *end
;
722 struct mm_struct
*mm
;
724 memset(buffer
, 0, sizeof(buffer
));
725 if (count
> sizeof(buffer
) - 1)
726 count
= sizeof(buffer
) - 1;
727 if (copy_from_user(buffer
, buf
, count
))
729 if (!simple_strtol(buffer
, &end
, 0))
733 task
= get_proc_task(file
->f_path
.dentry
->d_inode
);
736 mm
= get_task_mm(task
);
741 put_task_struct(task
);
742 if (end
- buffer
== 0)
747 static struct file_operations proc_clear_refs_operations
= {
748 .write
= clear_refs_write
,
752 #ifdef CONFIG_AUDITSYSCALL
754 static ssize_t
proc_loginuid_read(struct file
* file
, char __user
* buf
,
755 size_t count
, loff_t
*ppos
)
757 struct inode
* inode
= file
->f_path
.dentry
->d_inode
;
758 struct task_struct
*task
= get_proc_task(inode
);
760 char tmpbuf
[TMPBUFLEN
];
764 length
= scnprintf(tmpbuf
, TMPBUFLEN
, "%u",
765 audit_get_loginuid(task
->audit_context
));
766 put_task_struct(task
);
767 return simple_read_from_buffer(buf
, count
, ppos
, tmpbuf
, length
);
770 static ssize_t
proc_loginuid_write(struct file
* file
, const char __user
* buf
,
771 size_t count
, loff_t
*ppos
)
773 struct inode
* inode
= file
->f_path
.dentry
->d_inode
;
778 if (!capable(CAP_AUDIT_CONTROL
))
781 if (current
!= pid_task(proc_pid(inode
), PIDTYPE_PID
))
784 if (count
>= PAGE_SIZE
)
785 count
= PAGE_SIZE
- 1;
788 /* No partial writes. */
791 page
= (char*)__get_free_page(GFP_USER
);
795 if (copy_from_user(page
, buf
, count
))
799 loginuid
= simple_strtoul(page
, &tmp
, 10);
805 length
= audit_set_loginuid(current
, loginuid
);
806 if (likely(length
== 0))
810 free_page((unsigned long) page
);
814 static const struct file_operations proc_loginuid_operations
= {
815 .read
= proc_loginuid_read
,
816 .write
= proc_loginuid_write
,
820 #ifdef CONFIG_SECCOMP
821 static ssize_t
seccomp_read(struct file
*file
, char __user
*buf
,
822 size_t count
, loff_t
*ppos
)
824 struct task_struct
*tsk
= get_proc_task(file
->f_dentry
->d_inode
);
830 /* no need to print the trailing zero, so use only len */
831 len
= sprintf(__buf
, "%u\n", tsk
->seccomp
.mode
);
832 put_task_struct(tsk
);
834 return simple_read_from_buffer(buf
, count
, ppos
, __buf
, len
);
837 static ssize_t
seccomp_write(struct file
*file
, const char __user
*buf
,
838 size_t count
, loff_t
*ppos
)
840 struct task_struct
*tsk
= get_proc_task(file
->f_dentry
->d_inode
);
841 char __buf
[20], *end
;
842 unsigned int seccomp_mode
;
849 /* can set it only once to be even more secure */
851 if (unlikely(tsk
->seccomp
.mode
))
855 memset(__buf
, 0, sizeof(__buf
));
856 count
= min(count
, sizeof(__buf
) - 1);
857 if (copy_from_user(__buf
, buf
, count
))
860 seccomp_mode
= simple_strtoul(__buf
, &end
, 0);
864 if (seccomp_mode
&& seccomp_mode
<= NR_SECCOMP_MODES
) {
865 tsk
->seccomp
.mode
= seccomp_mode
;
866 set_tsk_thread_flag(tsk
, TIF_SECCOMP
);
870 if (unlikely(!(end
- __buf
)))
872 result
= end
- __buf
;
874 put_task_struct(tsk
);
879 static const struct file_operations proc_seccomp_operations
= {
880 .read
= seccomp_read
,
881 .write
= seccomp_write
,
883 #endif /* CONFIG_SECCOMP */
885 #ifdef CONFIG_FAULT_INJECTION
886 static ssize_t
proc_fault_inject_read(struct file
* file
, char __user
* buf
,
887 size_t count
, loff_t
*ppos
)
889 struct task_struct
*task
= get_proc_task(file
->f_dentry
->d_inode
);
890 char buffer
[PROC_NUMBUF
];
896 make_it_fail
= task
->make_it_fail
;
897 put_task_struct(task
);
899 len
= snprintf(buffer
, sizeof(buffer
), "%i\n", make_it_fail
);
901 return simple_read_from_buffer(buf
, count
, ppos
, buffer
, len
);
904 static ssize_t
proc_fault_inject_write(struct file
* file
,
905 const char __user
* buf
, size_t count
, loff_t
*ppos
)
907 struct task_struct
*task
;
908 char buffer
[PROC_NUMBUF
], *end
;
911 if (!capable(CAP_SYS_RESOURCE
))
913 memset(buffer
, 0, sizeof(buffer
));
914 if (count
> sizeof(buffer
) - 1)
915 count
= sizeof(buffer
) - 1;
916 if (copy_from_user(buffer
, buf
, count
))
918 make_it_fail
= simple_strtol(buffer
, &end
, 0);
921 task
= get_proc_task(file
->f_dentry
->d_inode
);
924 task
->make_it_fail
= make_it_fail
;
925 put_task_struct(task
);
926 if (end
- buffer
== 0)
931 static const struct file_operations proc_fault_inject_operations
= {
932 .read
= proc_fault_inject_read
,
933 .write
= proc_fault_inject_write
,
937 #ifdef CONFIG_SCHED_DEBUG
939 * Print out various scheduling related per-task fields:
941 static int sched_show(struct seq_file
*m
, void *v
)
943 struct inode
*inode
= m
->private;
944 struct task_struct
*p
;
948 p
= get_proc_task(inode
);
951 proc_sched_show_task(p
, m
);
959 sched_write(struct file
*file
, const char __user
*buf
,
960 size_t count
, loff_t
*offset
)
962 struct inode
*inode
= file
->f_path
.dentry
->d_inode
;
963 struct task_struct
*p
;
967 p
= get_proc_task(inode
);
970 proc_sched_set_task(p
);
977 static int sched_open(struct inode
*inode
, struct file
*filp
)
981 ret
= single_open(filp
, sched_show
, NULL
);
983 struct seq_file
*m
= filp
->private_data
;
990 static const struct file_operations proc_pid_sched_operations
= {
993 .write
= sched_write
,
995 .release
= seq_release
,
1000 static void *proc_pid_follow_link(struct dentry
*dentry
, struct nameidata
*nd
)
1002 struct inode
*inode
= dentry
->d_inode
;
1003 int error
= -EACCES
;
1005 /* We don't need a base pointer in the /proc filesystem */
1008 /* Are we allowed to snoop on the tasks file descriptors? */
1009 if (!proc_fd_access_allowed(inode
))
1012 error
= PROC_I(inode
)->op
.proc_get_link(inode
, &nd
->dentry
, &nd
->mnt
);
1013 nd
->last_type
= LAST_BIND
;
1015 return ERR_PTR(error
);
1018 static int do_proc_readlink(struct dentry
*dentry
, struct vfsmount
*mnt
,
1019 char __user
*buffer
, int buflen
)
1021 struct inode
* inode
;
1022 char *tmp
= (char*)__get_free_page(GFP_KERNEL
), *path
;
1028 inode
= dentry
->d_inode
;
1029 path
= d_path(dentry
, mnt
, tmp
, PAGE_SIZE
);
1030 len
= PTR_ERR(path
);
1033 len
= tmp
+ PAGE_SIZE
- 1 - path
;
1037 if (copy_to_user(buffer
, path
, len
))
1040 free_page((unsigned long)tmp
);
1044 static int proc_pid_readlink(struct dentry
* dentry
, char __user
* buffer
, int buflen
)
1046 int error
= -EACCES
;
1047 struct inode
*inode
= dentry
->d_inode
;
1049 struct vfsmount
*mnt
= NULL
;
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
, &de
, &mnt
);
1059 error
= do_proc_readlink(de
, mnt
, buffer
, buflen
);
1066 static const struct inode_operations proc_pid_link_inode_operations
= {
1067 .readlink
= proc_pid_readlink
,
1068 .follow_link
= proc_pid_follow_link
,
1069 .setattr
= proc_setattr
,
1073 /* building an inode */
1075 static int task_dumpable(struct task_struct
*task
)
1078 struct mm_struct
*mm
;
1083 dumpable
= mm
->dumpable
;
1091 static struct inode
*proc_pid_make_inode(struct super_block
* sb
, struct task_struct
*task
)
1093 struct inode
* inode
;
1094 struct proc_inode
*ei
;
1096 /* We need a new inode */
1098 inode
= new_inode(sb
);
1104 inode
->i_mtime
= inode
->i_atime
= inode
->i_ctime
= CURRENT_TIME
;
1105 inode
->i_op
= &proc_def_inode_operations
;
1108 * grab the reference to task.
1110 ei
->pid
= get_task_pid(task
, PIDTYPE_PID
);
1116 if (task_dumpable(task
)) {
1117 inode
->i_uid
= task
->euid
;
1118 inode
->i_gid
= task
->egid
;
1120 security_task_to_inode(task
, inode
);
1130 static int pid_getattr(struct vfsmount
*mnt
, struct dentry
*dentry
, struct kstat
*stat
)
1132 struct inode
*inode
= dentry
->d_inode
;
1133 struct task_struct
*task
;
1134 generic_fillattr(inode
, stat
);
1139 task
= pid_task(proc_pid(inode
), PIDTYPE_PID
);
1141 if ((inode
->i_mode
== (S_IFDIR
|S_IRUGO
|S_IXUGO
)) ||
1142 task_dumpable(task
)) {
1143 stat
->uid
= task
->euid
;
1144 stat
->gid
= task
->egid
;
1154 * Exceptional case: normally we are not allowed to unhash a busy
1155 * directory. In this case, however, we can do it - no aliasing problems
1156 * due to the way we treat inodes.
1158 * Rewrite the inode's ownerships here because the owning task may have
1159 * performed a setuid(), etc.
1161 * Before the /proc/pid/status file was created the only way to read
1162 * the effective uid of a /process was to stat /proc/pid. Reading
1163 * /proc/pid/status is slow enough that procps and other packages
1164 * kept stating /proc/pid. To keep the rules in /proc simple I have
1165 * made this apply to all per process world readable and executable
1168 static int pid_revalidate(struct dentry
*dentry
, struct nameidata
*nd
)
1170 struct inode
*inode
= dentry
->d_inode
;
1171 struct task_struct
*task
= get_proc_task(inode
);
1173 if ((inode
->i_mode
== (S_IFDIR
|S_IRUGO
|S_IXUGO
)) ||
1174 task_dumpable(task
)) {
1175 inode
->i_uid
= task
->euid
;
1176 inode
->i_gid
= task
->egid
;
1181 inode
->i_mode
&= ~(S_ISUID
| S_ISGID
);
1182 security_task_to_inode(task
, inode
);
1183 put_task_struct(task
);
1190 static int pid_delete_dentry(struct dentry
* dentry
)
1192 /* Is the task we represent dead?
1193 * If so, then don't put the dentry on the lru list,
1194 * kill it immediately.
1196 return !proc_pid(dentry
->d_inode
)->tasks
[PIDTYPE_PID
].first
;
1199 static struct dentry_operations pid_dentry_operations
=
1201 .d_revalidate
= pid_revalidate
,
1202 .d_delete
= pid_delete_dentry
,
1207 typedef struct dentry
*instantiate_t(struct inode
*, struct dentry
*,
1208 struct task_struct
*, const void *);
1211 * Fill a directory entry.
1213 * If possible create the dcache entry and derive our inode number and
1214 * file type from dcache entry.
1216 * Since all of the proc inode numbers are dynamically generated, the inode
1217 * numbers do not exist until the inode is cache. This means creating the
1218 * the dcache entry in readdir is necessary to keep the inode numbers
1219 * reported by readdir in sync with the inode numbers reported
1222 static int proc_fill_cache(struct file
*filp
, void *dirent
, filldir_t filldir
,
1223 char *name
, int len
,
1224 instantiate_t instantiate
, struct task_struct
*task
, const void *ptr
)
1226 struct dentry
*child
, *dir
= filp
->f_path
.dentry
;
1227 struct inode
*inode
;
1230 unsigned type
= DT_UNKNOWN
;
1234 qname
.hash
= full_name_hash(name
, len
);
1236 child
= d_lookup(dir
, &qname
);
1239 new = d_alloc(dir
, &qname
);
1241 child
= instantiate(dir
->d_inode
, new, task
, ptr
);
1248 if (!child
|| IS_ERR(child
) || !child
->d_inode
)
1249 goto end_instantiate
;
1250 inode
= child
->d_inode
;
1253 type
= inode
->i_mode
>> 12;
1258 ino
= find_inode_number(dir
, &qname
);
1261 return filldir(dirent
, name
, len
, filp
->f_pos
, ino
, type
);
1264 static unsigned name_to_int(struct dentry
*dentry
)
1266 const char *name
= dentry
->d_name
.name
;
1267 int len
= dentry
->d_name
.len
;
1270 if (len
> 1 && *name
== '0')
1273 unsigned c
= *name
++ - '0';
1276 if (n
>= (~0U-9)/10)
1286 #define PROC_FDINFO_MAX 64
1288 static int proc_fd_info(struct inode
*inode
, struct dentry
**dentry
,
1289 struct vfsmount
**mnt
, char *info
)
1291 struct task_struct
*task
= get_proc_task(inode
);
1292 struct files_struct
*files
= NULL
;
1294 int fd
= proc_fd(inode
);
1297 files
= get_files_struct(task
);
1298 put_task_struct(task
);
1302 * We are not taking a ref to the file structure, so we must
1305 spin_lock(&files
->file_lock
);
1306 file
= fcheck_files(files
, fd
);
1309 *mnt
= mntget(file
->f_path
.mnt
);
1311 *dentry
= dget(file
->f_path
.dentry
);
1313 snprintf(info
, PROC_FDINFO_MAX
,
1316 (long long) file
->f_pos
,
1318 spin_unlock(&files
->file_lock
);
1319 put_files_struct(files
);
1322 spin_unlock(&files
->file_lock
);
1323 put_files_struct(files
);
1328 static int proc_fd_link(struct inode
*inode
, struct dentry
**dentry
,
1329 struct vfsmount
**mnt
)
1331 return proc_fd_info(inode
, dentry
, mnt
, NULL
);
1334 static int tid_fd_revalidate(struct dentry
*dentry
, struct nameidata
*nd
)
1336 struct inode
*inode
= dentry
->d_inode
;
1337 struct task_struct
*task
= get_proc_task(inode
);
1338 int fd
= proc_fd(inode
);
1339 struct files_struct
*files
;
1342 files
= get_files_struct(task
);
1345 if (fcheck_files(files
, fd
)) {
1347 put_files_struct(files
);
1348 if (task_dumpable(task
)) {
1349 inode
->i_uid
= task
->euid
;
1350 inode
->i_gid
= task
->egid
;
1355 inode
->i_mode
&= ~(S_ISUID
| S_ISGID
);
1356 security_task_to_inode(task
, inode
);
1357 put_task_struct(task
);
1361 put_files_struct(files
);
1363 put_task_struct(task
);
1369 static struct dentry_operations tid_fd_dentry_operations
=
1371 .d_revalidate
= tid_fd_revalidate
,
1372 .d_delete
= pid_delete_dentry
,
1375 static struct dentry
*proc_fd_instantiate(struct inode
*dir
,
1376 struct dentry
*dentry
, struct task_struct
*task
, const void *ptr
)
1378 unsigned fd
= *(const unsigned *)ptr
;
1380 struct files_struct
*files
;
1381 struct inode
*inode
;
1382 struct proc_inode
*ei
;
1383 struct dentry
*error
= ERR_PTR(-ENOENT
);
1385 inode
= proc_pid_make_inode(dir
->i_sb
, task
);
1390 files
= get_files_struct(task
);
1393 inode
->i_mode
= S_IFLNK
;
1396 * We are not taking a ref to the file structure, so we must
1399 spin_lock(&files
->file_lock
);
1400 file
= fcheck_files(files
, fd
);
1403 if (file
->f_mode
& 1)
1404 inode
->i_mode
|= S_IRUSR
| S_IXUSR
;
1405 if (file
->f_mode
& 2)
1406 inode
->i_mode
|= S_IWUSR
| S_IXUSR
;
1407 spin_unlock(&files
->file_lock
);
1408 put_files_struct(files
);
1410 inode
->i_op
= &proc_pid_link_inode_operations
;
1412 ei
->op
.proc_get_link
= proc_fd_link
;
1413 dentry
->d_op
= &tid_fd_dentry_operations
;
1414 d_add(dentry
, inode
);
1415 /* Close the race of the process dying before we return the dentry */
1416 if (tid_fd_revalidate(dentry
, NULL
))
1422 spin_unlock(&files
->file_lock
);
1423 put_files_struct(files
);
1429 static struct dentry
*proc_lookupfd_common(struct inode
*dir
,
1430 struct dentry
*dentry
,
1431 instantiate_t instantiate
)
1433 struct task_struct
*task
= get_proc_task(dir
);
1434 unsigned fd
= name_to_int(dentry
);
1435 struct dentry
*result
= ERR_PTR(-ENOENT
);
1442 result
= instantiate(dir
, dentry
, task
, &fd
);
1444 put_task_struct(task
);
1449 static int proc_readfd_common(struct file
* filp
, void * dirent
,
1450 filldir_t filldir
, instantiate_t instantiate
)
1452 struct dentry
*dentry
= filp
->f_path
.dentry
;
1453 struct inode
*inode
= dentry
->d_inode
;
1454 struct task_struct
*p
= get_proc_task(inode
);
1455 unsigned int fd
, tid
, ino
;
1457 struct files_struct
* files
;
1458 struct fdtable
*fdt
;
1469 if (filldir(dirent
, ".", 1, 0, inode
->i_ino
, DT_DIR
) < 0)
1473 ino
= parent_ino(dentry
);
1474 if (filldir(dirent
, "..", 2, 1, ino
, DT_DIR
) < 0)
1478 files
= get_files_struct(p
);
1482 fdt
= files_fdtable(files
);
1483 for (fd
= filp
->f_pos
-2;
1485 fd
++, filp
->f_pos
++) {
1486 char name
[PROC_NUMBUF
];
1489 if (!fcheck_files(files
, fd
))
1493 len
= snprintf(name
, sizeof(name
), "%d", fd
);
1494 if (proc_fill_cache(filp
, dirent
, filldir
,
1495 name
, len
, instantiate
,
1503 put_files_struct(files
);
1511 static struct dentry
*proc_lookupfd(struct inode
*dir
, struct dentry
*dentry
,
1512 struct nameidata
*nd
)
1514 return proc_lookupfd_common(dir
, dentry
, proc_fd_instantiate
);
1517 static int proc_readfd(struct file
*filp
, void *dirent
, filldir_t filldir
)
1519 return proc_readfd_common(filp
, dirent
, filldir
, proc_fd_instantiate
);
1522 static ssize_t
proc_fdinfo_read(struct file
*file
, char __user
*buf
,
1523 size_t len
, loff_t
*ppos
)
1525 char tmp
[PROC_FDINFO_MAX
];
1526 int err
= proc_fd_info(file
->f_path
.dentry
->d_inode
, NULL
, NULL
, tmp
);
1528 err
= simple_read_from_buffer(buf
, len
, ppos
, tmp
, strlen(tmp
));
1532 static const struct file_operations proc_fdinfo_file_operations
= {
1533 .open
= nonseekable_open
,
1534 .read
= proc_fdinfo_read
,
1537 static const struct file_operations proc_fd_operations
= {
1538 .read
= generic_read_dir
,
1539 .readdir
= proc_readfd
,
1543 * /proc/pid/fd needs a special permission handler so that a process can still
1544 * access /proc/self/fd after it has executed a setuid().
1546 static int proc_fd_permission(struct inode
*inode
, int mask
,
1547 struct nameidata
*nd
)
1551 rv
= generic_permission(inode
, mask
, NULL
);
1554 if (task_pid(current
) == proc_pid(inode
))
1560 * proc directories can do almost nothing..
1562 static const struct inode_operations proc_fd_inode_operations
= {
1563 .lookup
= proc_lookupfd
,
1564 .permission
= proc_fd_permission
,
1565 .setattr
= proc_setattr
,
1568 static struct dentry
*proc_fdinfo_instantiate(struct inode
*dir
,
1569 struct dentry
*dentry
, struct task_struct
*task
, const void *ptr
)
1571 unsigned fd
= *(unsigned *)ptr
;
1572 struct inode
*inode
;
1573 struct proc_inode
*ei
;
1574 struct dentry
*error
= ERR_PTR(-ENOENT
);
1576 inode
= proc_pid_make_inode(dir
->i_sb
, task
);
1581 inode
->i_mode
= S_IFREG
| S_IRUSR
;
1582 inode
->i_fop
= &proc_fdinfo_file_operations
;
1583 dentry
->d_op
= &tid_fd_dentry_operations
;
1584 d_add(dentry
, inode
);
1585 /* Close the race of the process dying before we return the dentry */
1586 if (tid_fd_revalidate(dentry
, NULL
))
1593 static struct dentry
*proc_lookupfdinfo(struct inode
*dir
,
1594 struct dentry
*dentry
,
1595 struct nameidata
*nd
)
1597 return proc_lookupfd_common(dir
, dentry
, proc_fdinfo_instantiate
);
1600 static int proc_readfdinfo(struct file
*filp
, void *dirent
, filldir_t filldir
)
1602 return proc_readfd_common(filp
, dirent
, filldir
,
1603 proc_fdinfo_instantiate
);
1606 static const struct file_operations proc_fdinfo_operations
= {
1607 .read
= generic_read_dir
,
1608 .readdir
= proc_readfdinfo
,
1612 * proc directories can do almost nothing..
1614 static const struct inode_operations proc_fdinfo_inode_operations
= {
1615 .lookup
= proc_lookupfdinfo
,
1616 .setattr
= proc_setattr
,
1620 static struct dentry
*proc_pident_instantiate(struct inode
*dir
,
1621 struct dentry
*dentry
, struct task_struct
*task
, const void *ptr
)
1623 const struct pid_entry
*p
= ptr
;
1624 struct inode
*inode
;
1625 struct proc_inode
*ei
;
1626 struct dentry
*error
= ERR_PTR(-EINVAL
);
1628 inode
= proc_pid_make_inode(dir
->i_sb
, task
);
1633 inode
->i_mode
= p
->mode
;
1634 if (S_ISDIR(inode
->i_mode
))
1635 inode
->i_nlink
= 2; /* Use getattr to fix if necessary */
1637 inode
->i_op
= p
->iop
;
1639 inode
->i_fop
= p
->fop
;
1641 dentry
->d_op
= &pid_dentry_operations
;
1642 d_add(dentry
, inode
);
1643 /* Close the race of the process dying before we return the dentry */
1644 if (pid_revalidate(dentry
, NULL
))
1650 static struct dentry
*proc_pident_lookup(struct inode
*dir
,
1651 struct dentry
*dentry
,
1652 const struct pid_entry
*ents
,
1655 struct inode
*inode
;
1656 struct dentry
*error
;
1657 struct task_struct
*task
= get_proc_task(dir
);
1658 const struct pid_entry
*p
, *last
;
1660 error
= ERR_PTR(-ENOENT
);
1667 * Yes, it does not scale. And it should not. Don't add
1668 * new entries into /proc/<tgid>/ without very good reasons.
1670 last
= &ents
[nents
- 1];
1671 for (p
= ents
; p
<= last
; p
++) {
1672 if (p
->len
!= dentry
->d_name
.len
)
1674 if (!memcmp(dentry
->d_name
.name
, p
->name
, p
->len
))
1680 error
= proc_pident_instantiate(dir
, dentry
, task
, p
);
1682 put_task_struct(task
);
1687 static int proc_pident_fill_cache(struct file
*filp
, void *dirent
,
1688 filldir_t filldir
, struct task_struct
*task
, const struct pid_entry
*p
)
1690 return proc_fill_cache(filp
, dirent
, filldir
, p
->name
, p
->len
,
1691 proc_pident_instantiate
, task
, p
);
1694 static int proc_pident_readdir(struct file
*filp
,
1695 void *dirent
, filldir_t filldir
,
1696 const struct pid_entry
*ents
, unsigned int nents
)
1700 struct dentry
*dentry
= filp
->f_path
.dentry
;
1701 struct inode
*inode
= dentry
->d_inode
;
1702 struct task_struct
*task
= get_proc_task(inode
);
1703 const struct pid_entry
*p
, *last
;
1717 if (filldir(dirent
, ".", 1, i
, ino
, DT_DIR
) < 0)
1723 ino
= parent_ino(dentry
);
1724 if (filldir(dirent
, "..", 2, i
, ino
, DT_DIR
) < 0)
1736 last
= &ents
[nents
- 1];
1738 if (proc_pident_fill_cache(filp
, dirent
, filldir
, task
, p
) < 0)
1747 put_task_struct(task
);
1752 #ifdef CONFIG_SECURITY
1753 static ssize_t
proc_pid_attr_read(struct file
* file
, char __user
* buf
,
1754 size_t count
, loff_t
*ppos
)
1756 struct inode
* inode
= file
->f_path
.dentry
->d_inode
;
1759 struct task_struct
*task
= get_proc_task(inode
);
1764 length
= security_getprocattr(task
,
1765 (char*)file
->f_path
.dentry
->d_name
.name
,
1767 put_task_struct(task
);
1769 length
= simple_read_from_buffer(buf
, count
, ppos
, p
, length
);
1774 static ssize_t
proc_pid_attr_write(struct file
* file
, const char __user
* buf
,
1775 size_t count
, loff_t
*ppos
)
1777 struct inode
* inode
= file
->f_path
.dentry
->d_inode
;
1780 struct task_struct
*task
= get_proc_task(inode
);
1785 if (count
> PAGE_SIZE
)
1788 /* No partial writes. */
1794 page
= (char*)__get_free_page(GFP_USER
);
1799 if (copy_from_user(page
, buf
, count
))
1802 length
= security_setprocattr(task
,
1803 (char*)file
->f_path
.dentry
->d_name
.name
,
1804 (void*)page
, count
);
1806 free_page((unsigned long) page
);
1808 put_task_struct(task
);
1813 static const struct file_operations proc_pid_attr_operations
= {
1814 .read
= proc_pid_attr_read
,
1815 .write
= proc_pid_attr_write
,
1818 static const struct pid_entry attr_dir_stuff
[] = {
1819 REG("current", S_IRUGO
|S_IWUGO
, pid_attr
),
1820 REG("prev", S_IRUGO
, pid_attr
),
1821 REG("exec", S_IRUGO
|S_IWUGO
, pid_attr
),
1822 REG("fscreate", S_IRUGO
|S_IWUGO
, pid_attr
),
1823 REG("keycreate", S_IRUGO
|S_IWUGO
, pid_attr
),
1824 REG("sockcreate", S_IRUGO
|S_IWUGO
, pid_attr
),
1827 static int proc_attr_dir_readdir(struct file
* filp
,
1828 void * dirent
, filldir_t filldir
)
1830 return proc_pident_readdir(filp
,dirent
,filldir
,
1831 attr_dir_stuff
,ARRAY_SIZE(attr_dir_stuff
));
1834 static const struct file_operations proc_attr_dir_operations
= {
1835 .read
= generic_read_dir
,
1836 .readdir
= proc_attr_dir_readdir
,
1839 static struct dentry
*proc_attr_dir_lookup(struct inode
*dir
,
1840 struct dentry
*dentry
, struct nameidata
*nd
)
1842 return proc_pident_lookup(dir
, dentry
,
1843 attr_dir_stuff
, ARRAY_SIZE(attr_dir_stuff
));
1846 static const struct inode_operations proc_attr_dir_inode_operations
= {
1847 .lookup
= proc_attr_dir_lookup
,
1848 .getattr
= pid_getattr
,
1849 .setattr
= proc_setattr
,
1857 static int proc_self_readlink(struct dentry
*dentry
, char __user
*buffer
,
1860 char tmp
[PROC_NUMBUF
];
1861 sprintf(tmp
, "%d", current
->tgid
);
1862 return vfs_readlink(dentry
,buffer
,buflen
,tmp
);
1865 static void *proc_self_follow_link(struct dentry
*dentry
, struct nameidata
*nd
)
1867 char tmp
[PROC_NUMBUF
];
1868 sprintf(tmp
, "%d", current
->tgid
);
1869 return ERR_PTR(vfs_follow_link(nd
,tmp
));
1872 static const struct inode_operations proc_self_inode_operations
= {
1873 .readlink
= proc_self_readlink
,
1874 .follow_link
= proc_self_follow_link
,
1880 * These are the directory entries in the root directory of /proc
1881 * that properly belong to the /proc filesystem, as they describe
1882 * describe something that is process related.
1884 static const struct pid_entry proc_base_stuff
[] = {
1885 NOD("self", S_IFLNK
|S_IRWXUGO
,
1886 &proc_self_inode_operations
, NULL
, {}),
1890 * Exceptional case: normally we are not allowed to unhash a busy
1891 * directory. In this case, however, we can do it - no aliasing problems
1892 * due to the way we treat inodes.
1894 static int proc_base_revalidate(struct dentry
*dentry
, struct nameidata
*nd
)
1896 struct inode
*inode
= dentry
->d_inode
;
1897 struct task_struct
*task
= get_proc_task(inode
);
1899 put_task_struct(task
);
1906 static struct dentry_operations proc_base_dentry_operations
=
1908 .d_revalidate
= proc_base_revalidate
,
1909 .d_delete
= pid_delete_dentry
,
1912 static struct dentry
*proc_base_instantiate(struct inode
*dir
,
1913 struct dentry
*dentry
, struct task_struct
*task
, const void *ptr
)
1915 const struct pid_entry
*p
= ptr
;
1916 struct inode
*inode
;
1917 struct proc_inode
*ei
;
1918 struct dentry
*error
= ERR_PTR(-EINVAL
);
1920 /* Allocate the inode */
1921 error
= ERR_PTR(-ENOMEM
);
1922 inode
= new_inode(dir
->i_sb
);
1926 /* Initialize the inode */
1928 inode
->i_mtime
= inode
->i_atime
= inode
->i_ctime
= CURRENT_TIME
;
1931 * grab the reference to the task.
1933 ei
->pid
= get_task_pid(task
, PIDTYPE_PID
);
1939 inode
->i_mode
= p
->mode
;
1940 if (S_ISDIR(inode
->i_mode
))
1942 if (S_ISLNK(inode
->i_mode
))
1945 inode
->i_op
= p
->iop
;
1947 inode
->i_fop
= p
->fop
;
1949 dentry
->d_op
= &proc_base_dentry_operations
;
1950 d_add(dentry
, inode
);
1959 static struct dentry
*proc_base_lookup(struct inode
*dir
, struct dentry
*dentry
)
1961 struct dentry
*error
;
1962 struct task_struct
*task
= get_proc_task(dir
);
1963 const struct pid_entry
*p
, *last
;
1965 error
= ERR_PTR(-ENOENT
);
1970 /* Lookup the directory entry */
1971 last
= &proc_base_stuff
[ARRAY_SIZE(proc_base_stuff
) - 1];
1972 for (p
= proc_base_stuff
; p
<= last
; p
++) {
1973 if (p
->len
!= dentry
->d_name
.len
)
1975 if (!memcmp(dentry
->d_name
.name
, p
->name
, p
->len
))
1981 error
= proc_base_instantiate(dir
, dentry
, task
, p
);
1984 put_task_struct(task
);
1989 static int proc_base_fill_cache(struct file
*filp
, void *dirent
,
1990 filldir_t filldir
, struct task_struct
*task
, const struct pid_entry
*p
)
1992 return proc_fill_cache(filp
, dirent
, filldir
, p
->name
, p
->len
,
1993 proc_base_instantiate
, task
, p
);
1996 #ifdef CONFIG_TASK_IO_ACCOUNTING
1997 static int proc_pid_io_accounting(struct task_struct
*task
, char *buffer
)
1999 return sprintf(buffer
,
2000 #ifdef CONFIG_TASK_XACCT
2006 "read_bytes: %llu\n"
2007 "write_bytes: %llu\n"
2008 "cancelled_write_bytes: %llu\n",
2009 #ifdef CONFIG_TASK_XACCT
2010 (unsigned long long)task
->rchar
,
2011 (unsigned long long)task
->wchar
,
2012 (unsigned long long)task
->syscr
,
2013 (unsigned long long)task
->syscw
,
2015 (unsigned long long)task
->ioac
.read_bytes
,
2016 (unsigned long long)task
->ioac
.write_bytes
,
2017 (unsigned long long)task
->ioac
.cancelled_write_bytes
);
2024 static const struct file_operations proc_task_operations
;
2025 static const struct inode_operations proc_task_inode_operations
;
2027 static const struct pid_entry tgid_base_stuff
[] = {
2028 DIR("task", S_IRUGO
|S_IXUGO
, task
),
2029 DIR("fd", S_IRUSR
|S_IXUSR
, fd
),
2030 DIR("fdinfo", S_IRUSR
|S_IXUSR
, fdinfo
),
2031 INF("environ", S_IRUSR
, pid_environ
),
2032 INF("auxv", S_IRUSR
, pid_auxv
),
2033 INF("status", S_IRUGO
, pid_status
),
2034 #ifdef CONFIG_SCHED_DEBUG
2035 REG("sched", S_IRUGO
|S_IWUSR
, pid_sched
),
2037 INF("cmdline", S_IRUGO
, pid_cmdline
),
2038 INF("stat", S_IRUGO
, tgid_stat
),
2039 INF("statm", S_IRUGO
, pid_statm
),
2040 REG("maps", S_IRUGO
, maps
),
2042 REG("numa_maps", S_IRUGO
, numa_maps
),
2044 REG("mem", S_IRUSR
|S_IWUSR
, mem
),
2045 #ifdef CONFIG_SECCOMP
2046 REG("seccomp", S_IRUSR
|S_IWUSR
, seccomp
),
2051 REG("mounts", S_IRUGO
, mounts
),
2052 REG("mountstats", S_IRUSR
, mountstats
),
2054 REG("clear_refs", S_IWUSR
, clear_refs
),
2055 REG("smaps", S_IRUGO
, smaps
),
2057 #ifdef CONFIG_SECURITY
2058 DIR("attr", S_IRUGO
|S_IXUGO
, attr_dir
),
2060 #ifdef CONFIG_KALLSYMS
2061 INF("wchan", S_IRUGO
, pid_wchan
),
2063 #ifdef CONFIG_SCHEDSTATS
2064 INF("schedstat", S_IRUGO
, pid_schedstat
),
2066 #ifdef CONFIG_CPUSETS
2067 REG("cpuset", S_IRUGO
, cpuset
),
2069 INF("oom_score", S_IRUGO
, oom_score
),
2070 REG("oom_adj", S_IRUGO
|S_IWUSR
, oom_adjust
),
2071 #ifdef CONFIG_AUDITSYSCALL
2072 REG("loginuid", S_IWUSR
|S_IRUGO
, loginuid
),
2074 #ifdef CONFIG_FAULT_INJECTION
2075 REG("make-it-fail", S_IRUGO
|S_IWUSR
, fault_inject
),
2077 #ifdef CONFIG_TASK_IO_ACCOUNTING
2078 INF("io", S_IRUGO
, pid_io_accounting
),
2082 static int proc_tgid_base_readdir(struct file
* filp
,
2083 void * dirent
, filldir_t filldir
)
2085 return proc_pident_readdir(filp
,dirent
,filldir
,
2086 tgid_base_stuff
,ARRAY_SIZE(tgid_base_stuff
));
2089 static const struct file_operations proc_tgid_base_operations
= {
2090 .read
= generic_read_dir
,
2091 .readdir
= proc_tgid_base_readdir
,
2094 static struct dentry
*proc_tgid_base_lookup(struct inode
*dir
, struct dentry
*dentry
, struct nameidata
*nd
){
2095 return proc_pident_lookup(dir
, dentry
,
2096 tgid_base_stuff
, ARRAY_SIZE(tgid_base_stuff
));
2099 static const struct inode_operations proc_tgid_base_inode_operations
= {
2100 .lookup
= proc_tgid_base_lookup
,
2101 .getattr
= pid_getattr
,
2102 .setattr
= proc_setattr
,
2106 * proc_flush_task - Remove dcache entries for @task from the /proc dcache.
2108 * @task: task that should be flushed.
2110 * Looks in the dcache for
2112 * /proc/@tgid/task/@pid
2113 * if either directory is present flushes it and all of it'ts children
2116 * It is safe and reasonable to cache /proc entries for a task until
2117 * that task exits. After that they just clog up the dcache with
2118 * useless entries, possibly causing useful dcache entries to be
2119 * flushed instead. This routine is proved to flush those useless
2120 * dcache entries at process exit time.
2122 * NOTE: This routine is just an optimization so it does not guarantee
2123 * that no dcache entries will exist at process exit time it
2124 * just makes it very unlikely that any will persist.
2126 void proc_flush_task(struct task_struct
*task
)
2128 struct dentry
*dentry
, *leader
, *dir
;
2129 char buf
[PROC_NUMBUF
];
2133 name
.len
= snprintf(buf
, sizeof(buf
), "%d", task
->pid
);
2134 dentry
= d_hash_and_lookup(proc_mnt
->mnt_root
, &name
);
2136 shrink_dcache_parent(dentry
);
2141 if (thread_group_leader(task
))
2145 name
.len
= snprintf(buf
, sizeof(buf
), "%d", task
->tgid
);
2146 leader
= d_hash_and_lookup(proc_mnt
->mnt_root
, &name
);
2151 name
.len
= strlen(name
.name
);
2152 dir
= d_hash_and_lookup(leader
, &name
);
2154 goto out_put_leader
;
2157 name
.len
= snprintf(buf
, sizeof(buf
), "%d", task
->pid
);
2158 dentry
= d_hash_and_lookup(dir
, &name
);
2160 shrink_dcache_parent(dentry
);
2172 static struct dentry
*proc_pid_instantiate(struct inode
*dir
,
2173 struct dentry
* dentry
,
2174 struct task_struct
*task
, const void *ptr
)
2176 struct dentry
*error
= ERR_PTR(-ENOENT
);
2177 struct inode
*inode
;
2179 inode
= proc_pid_make_inode(dir
->i_sb
, task
);
2183 inode
->i_mode
= S_IFDIR
|S_IRUGO
|S_IXUGO
;
2184 inode
->i_op
= &proc_tgid_base_inode_operations
;
2185 inode
->i_fop
= &proc_tgid_base_operations
;
2186 inode
->i_flags
|=S_IMMUTABLE
;
2188 #ifdef CONFIG_SECURITY
2189 inode
->i_nlink
+= 1;
2192 dentry
->d_op
= &pid_dentry_operations
;
2194 d_add(dentry
, inode
);
2195 /* Close the race of the process dying before we return the dentry */
2196 if (pid_revalidate(dentry
, NULL
))
2202 struct dentry
*proc_pid_lookup(struct inode
*dir
, struct dentry
* dentry
, struct nameidata
*nd
)
2204 struct dentry
*result
= ERR_PTR(-ENOENT
);
2205 struct task_struct
*task
;
2208 result
= proc_base_lookup(dir
, dentry
);
2209 if (!IS_ERR(result
) || PTR_ERR(result
) != -ENOENT
)
2212 tgid
= name_to_int(dentry
);
2217 task
= find_task_by_pid(tgid
);
2219 get_task_struct(task
);
2224 result
= proc_pid_instantiate(dir
, dentry
, task
, NULL
);
2225 put_task_struct(task
);
2231 * Find the first task with tgid >= tgid
2234 static struct task_struct
*next_tgid(unsigned int tgid
)
2236 struct task_struct
*task
;
2242 pid
= find_ge_pid(tgid
);
2245 task
= pid_task(pid
, PIDTYPE_PID
);
2246 /* What we to know is if the pid we have find is the
2247 * pid of a thread_group_leader. Testing for task
2248 * being a thread_group_leader is the obvious thing
2249 * todo but there is a window when it fails, due to
2250 * the pid transfer logic in de_thread.
2252 * So we perform the straight forward test of seeing
2253 * if the pid we have found is the pid of a thread
2254 * group leader, and don't worry if the task we have
2255 * found doesn't happen to be a thread group leader.
2256 * As we don't care in the case of readdir.
2258 if (!task
|| !has_group_leader_pid(task
))
2260 get_task_struct(task
);
2266 #define TGID_OFFSET (FIRST_PROCESS_ENTRY + ARRAY_SIZE(proc_base_stuff))
2268 static int proc_pid_fill_cache(struct file
*filp
, void *dirent
, filldir_t filldir
,
2269 struct task_struct
*task
, int tgid
)
2271 char name
[PROC_NUMBUF
];
2272 int len
= snprintf(name
, sizeof(name
), "%d", tgid
);
2273 return proc_fill_cache(filp
, dirent
, filldir
, name
, len
,
2274 proc_pid_instantiate
, task
, NULL
);
2277 /* for the /proc/ directory itself, after non-process stuff has been done */
2278 int proc_pid_readdir(struct file
* filp
, void * dirent
, filldir_t filldir
)
2280 unsigned int nr
= filp
->f_pos
- FIRST_PROCESS_ENTRY
;
2281 struct task_struct
*reaper
= get_proc_task(filp
->f_path
.dentry
->d_inode
);
2282 struct task_struct
*task
;
2288 for (; nr
< ARRAY_SIZE(proc_base_stuff
); filp
->f_pos
++, nr
++) {
2289 const struct pid_entry
*p
= &proc_base_stuff
[nr
];
2290 if (proc_base_fill_cache(filp
, dirent
, filldir
, reaper
, p
) < 0)
2294 tgid
= filp
->f_pos
- TGID_OFFSET
;
2295 for (task
= next_tgid(tgid
);
2297 put_task_struct(task
), task
= next_tgid(tgid
+ 1)) {
2299 filp
->f_pos
= tgid
+ TGID_OFFSET
;
2300 if (proc_pid_fill_cache(filp
, dirent
, filldir
, task
, tgid
) < 0) {
2301 put_task_struct(task
);
2305 filp
->f_pos
= PID_MAX_LIMIT
+ TGID_OFFSET
;
2307 put_task_struct(reaper
);
2315 static const struct pid_entry tid_base_stuff
[] = {
2316 DIR("fd", S_IRUSR
|S_IXUSR
, fd
),
2317 DIR("fdinfo", S_IRUSR
|S_IXUSR
, fdinfo
),
2318 INF("environ", S_IRUSR
, pid_environ
),
2319 INF("auxv", S_IRUSR
, pid_auxv
),
2320 INF("status", S_IRUGO
, pid_status
),
2321 #ifdef CONFIG_SCHED_DEBUG
2322 REG("sched", S_IRUGO
|S_IWUSR
, pid_sched
),
2324 INF("cmdline", S_IRUGO
, pid_cmdline
),
2325 INF("stat", S_IRUGO
, tid_stat
),
2326 INF("statm", S_IRUGO
, pid_statm
),
2327 REG("maps", S_IRUGO
, maps
),
2329 REG("numa_maps", S_IRUGO
, numa_maps
),
2331 REG("mem", S_IRUSR
|S_IWUSR
, mem
),
2332 #ifdef CONFIG_SECCOMP
2333 REG("seccomp", S_IRUSR
|S_IWUSR
, seccomp
),
2338 REG("mounts", S_IRUGO
, mounts
),
2340 REG("clear_refs", S_IWUSR
, clear_refs
),
2341 REG("smaps", S_IRUGO
, smaps
),
2343 #ifdef CONFIG_SECURITY
2344 DIR("attr", S_IRUGO
|S_IXUGO
, attr_dir
),
2346 #ifdef CONFIG_KALLSYMS
2347 INF("wchan", S_IRUGO
, pid_wchan
),
2349 #ifdef CONFIG_SCHEDSTATS
2350 INF("schedstat", S_IRUGO
, pid_schedstat
),
2352 #ifdef CONFIG_CPUSETS
2353 REG("cpuset", S_IRUGO
, cpuset
),
2355 INF("oom_score", S_IRUGO
, oom_score
),
2356 REG("oom_adj", S_IRUGO
|S_IWUSR
, oom_adjust
),
2357 #ifdef CONFIG_AUDITSYSCALL
2358 REG("loginuid", S_IWUSR
|S_IRUGO
, loginuid
),
2360 #ifdef CONFIG_FAULT_INJECTION
2361 REG("make-it-fail", S_IRUGO
|S_IWUSR
, fault_inject
),
2365 static int proc_tid_base_readdir(struct file
* filp
,
2366 void * dirent
, filldir_t filldir
)
2368 return proc_pident_readdir(filp
,dirent
,filldir
,
2369 tid_base_stuff
,ARRAY_SIZE(tid_base_stuff
));
2372 static struct dentry
*proc_tid_base_lookup(struct inode
*dir
, struct dentry
*dentry
, struct nameidata
*nd
){
2373 return proc_pident_lookup(dir
, dentry
,
2374 tid_base_stuff
, ARRAY_SIZE(tid_base_stuff
));
2377 static const struct file_operations proc_tid_base_operations
= {
2378 .read
= generic_read_dir
,
2379 .readdir
= proc_tid_base_readdir
,
2382 static const struct inode_operations proc_tid_base_inode_operations
= {
2383 .lookup
= proc_tid_base_lookup
,
2384 .getattr
= pid_getattr
,
2385 .setattr
= proc_setattr
,
2388 static struct dentry
*proc_task_instantiate(struct inode
*dir
,
2389 struct dentry
*dentry
, struct task_struct
*task
, const void *ptr
)
2391 struct dentry
*error
= ERR_PTR(-ENOENT
);
2392 struct inode
*inode
;
2393 inode
= proc_pid_make_inode(dir
->i_sb
, task
);
2397 inode
->i_mode
= S_IFDIR
|S_IRUGO
|S_IXUGO
;
2398 inode
->i_op
= &proc_tid_base_inode_operations
;
2399 inode
->i_fop
= &proc_tid_base_operations
;
2400 inode
->i_flags
|=S_IMMUTABLE
;
2402 #ifdef CONFIG_SECURITY
2403 inode
->i_nlink
+= 1;
2406 dentry
->d_op
= &pid_dentry_operations
;
2408 d_add(dentry
, inode
);
2409 /* Close the race of the process dying before we return the dentry */
2410 if (pid_revalidate(dentry
, NULL
))
2416 static struct dentry
*proc_task_lookup(struct inode
*dir
, struct dentry
* dentry
, struct nameidata
*nd
)
2418 struct dentry
*result
= ERR_PTR(-ENOENT
);
2419 struct task_struct
*task
;
2420 struct task_struct
*leader
= get_proc_task(dir
);
2426 tid
= name_to_int(dentry
);
2431 task
= find_task_by_pid(tid
);
2433 get_task_struct(task
);
2437 if (leader
->tgid
!= task
->tgid
)
2440 result
= proc_task_instantiate(dir
, dentry
, task
, NULL
);
2442 put_task_struct(task
);
2444 put_task_struct(leader
);
2450 * Find the first tid of a thread group to return to user space.
2452 * Usually this is just the thread group leader, but if the users
2453 * buffer was too small or there was a seek into the middle of the
2454 * directory we have more work todo.
2456 * In the case of a short read we start with find_task_by_pid.
2458 * In the case of a seek we start with the leader and walk nr
2461 static struct task_struct
*first_tid(struct task_struct
*leader
,
2464 struct task_struct
*pos
;
2467 /* Attempt to start with the pid of a thread */
2468 if (tid
&& (nr
> 0)) {
2469 pos
= find_task_by_pid(tid
);
2470 if (pos
&& (pos
->group_leader
== leader
))
2474 /* If nr exceeds the number of threads there is nothing todo */
2476 if (nr
&& nr
>= get_nr_threads(leader
))
2479 /* If we haven't found our starting place yet start
2480 * with the leader and walk nr threads forward.
2482 for (pos
= leader
; nr
> 0; --nr
) {
2483 pos
= next_thread(pos
);
2484 if (pos
== leader
) {
2490 get_task_struct(pos
);
2497 * Find the next thread in the thread list.
2498 * Return NULL if there is an error or no next thread.
2500 * The reference to the input task_struct is released.
2502 static struct task_struct
*next_tid(struct task_struct
*start
)
2504 struct task_struct
*pos
= NULL
;
2506 if (pid_alive(start
)) {
2507 pos
= next_thread(start
);
2508 if (thread_group_leader(pos
))
2511 get_task_struct(pos
);
2514 put_task_struct(start
);
2518 static int proc_task_fill_cache(struct file
*filp
, void *dirent
, filldir_t filldir
,
2519 struct task_struct
*task
, int tid
)
2521 char name
[PROC_NUMBUF
];
2522 int len
= snprintf(name
, sizeof(name
), "%d", tid
);
2523 return proc_fill_cache(filp
, dirent
, filldir
, name
, len
,
2524 proc_task_instantiate
, task
, NULL
);
2527 /* for the /proc/TGID/task/ directories */
2528 static int proc_task_readdir(struct file
* filp
, void * dirent
, filldir_t filldir
)
2530 struct dentry
*dentry
= filp
->f_path
.dentry
;
2531 struct inode
*inode
= dentry
->d_inode
;
2532 struct task_struct
*leader
= NULL
;
2533 struct task_struct
*task
;
2534 int retval
= -ENOENT
;
2537 unsigned long pos
= filp
->f_pos
; /* avoiding "long long" filp->f_pos */
2539 task
= get_proc_task(inode
);
2543 if (pid_alive(task
)) {
2544 leader
= task
->group_leader
;
2545 get_task_struct(leader
);
2548 put_task_struct(task
);
2556 if (filldir(dirent
, ".", 1, pos
, ino
, DT_DIR
) < 0)
2561 ino
= parent_ino(dentry
);
2562 if (filldir(dirent
, "..", 2, pos
, ino
, DT_DIR
) < 0)
2568 /* f_version caches the tgid value that the last readdir call couldn't
2569 * return. lseek aka telldir automagically resets f_version to 0.
2571 tid
= filp
->f_version
;
2572 filp
->f_version
= 0;
2573 for (task
= first_tid(leader
, tid
, pos
- 2);
2575 task
= next_tid(task
), pos
++) {
2577 if (proc_task_fill_cache(filp
, dirent
, filldir
, task
, tid
) < 0) {
2578 /* returning this tgid failed, save it as the first
2579 * pid for the next readir call */
2580 filp
->f_version
= tid
;
2581 put_task_struct(task
);
2587 put_task_struct(leader
);
2592 static int proc_task_getattr(struct vfsmount
*mnt
, struct dentry
*dentry
, struct kstat
*stat
)
2594 struct inode
*inode
= dentry
->d_inode
;
2595 struct task_struct
*p
= get_proc_task(inode
);
2596 generic_fillattr(inode
, stat
);
2600 stat
->nlink
+= get_nr_threads(p
);
2608 static const struct inode_operations proc_task_inode_operations
= {
2609 .lookup
= proc_task_lookup
,
2610 .getattr
= proc_task_getattr
,
2611 .setattr
= proc_setattr
,
2614 static const struct file_operations proc_task_operations
= {
2615 .read
= generic_read_dir
,
2616 .readdir
= proc_task_readdir
,