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 struct inode_operations
*iop
;
97 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 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
;
374 ns
= task
->nsproxy
->mnt_ns
;
378 put_task_struct(task
);
383 p
= kmalloc(sizeof(struct proc_mounts
), GFP_KERNEL
);
385 file
->private_data
= &p
->m
;
386 ret
= seq_open(file
, &mounts_op
);
389 p
->event
= ns
->event
;
399 static int mounts_release(struct inode
*inode
, struct file
*file
)
401 struct seq_file
*m
= file
->private_data
;
402 struct mnt_namespace
*ns
= m
->private;
404 return seq_release(inode
, file
);
407 static unsigned mounts_poll(struct file
*file
, poll_table
*wait
)
409 struct proc_mounts
*p
= file
->private_data
;
410 struct mnt_namespace
*ns
= p
->m
.private;
413 poll_wait(file
, &ns
->poll
, wait
);
415 spin_lock(&vfsmount_lock
);
416 if (p
->event
!= ns
->event
) {
417 p
->event
= ns
->event
;
420 spin_unlock(&vfsmount_lock
);
425 static struct file_operations proc_mounts_operations
= {
429 .release
= mounts_release
,
433 extern struct seq_operations mountstats_op
;
434 static int mountstats_open(struct inode
*inode
, struct file
*file
)
436 int ret
= seq_open(file
, &mountstats_op
);
439 struct seq_file
*m
= file
->private_data
;
440 struct mnt_namespace
*mnt_ns
= NULL
;
441 struct task_struct
*task
= get_proc_task(inode
);
446 mnt_ns
= task
->nsproxy
->mnt_ns
;
450 put_task_struct(task
);
456 seq_release(inode
, file
);
463 static struct file_operations proc_mountstats_operations
= {
464 .open
= mountstats_open
,
467 .release
= mounts_release
,
470 #define PROC_BLOCK_SIZE (3*1024) /* 4K page size but our output routines use some slack for overruns */
472 static ssize_t
proc_info_read(struct file
* file
, char __user
* buf
,
473 size_t count
, loff_t
*ppos
)
475 struct inode
* inode
= file
->f_path
.dentry
->d_inode
;
478 struct task_struct
*task
= get_proc_task(inode
);
484 if (count
> PROC_BLOCK_SIZE
)
485 count
= PROC_BLOCK_SIZE
;
488 if (!(page
= __get_free_page(GFP_KERNEL
)))
491 length
= PROC_I(inode
)->op
.proc_read(task
, (char*)page
);
494 length
= simple_read_from_buffer(buf
, count
, ppos
, (char *)page
, length
);
497 put_task_struct(task
);
502 static struct file_operations proc_info_file_operations
= {
503 .read
= proc_info_read
,
506 static int mem_open(struct inode
* inode
, struct file
* file
)
508 file
->private_data
= (void*)((long)current
->self_exec_id
);
512 static ssize_t
mem_read(struct file
* file
, char __user
* buf
,
513 size_t count
, loff_t
*ppos
)
515 struct task_struct
*task
= get_proc_task(file
->f_path
.dentry
->d_inode
);
517 unsigned long src
= *ppos
;
519 struct mm_struct
*mm
;
524 if (!MAY_PTRACE(task
) || !ptrace_may_attach(task
))
528 page
= (char *)__get_free_page(GFP_USER
);
534 mm
= get_task_mm(task
);
540 if (file
->private_data
!= (void*)((long)current
->self_exec_id
))
546 int this_len
, retval
;
548 this_len
= (count
> PAGE_SIZE
) ? PAGE_SIZE
: count
;
549 retval
= access_process_vm(task
, src
, page
, this_len
, 0);
550 if (!retval
|| !MAY_PTRACE(task
) || !ptrace_may_attach(task
)) {
556 if (copy_to_user(buf
, page
, retval
)) {
571 free_page((unsigned long) page
);
573 put_task_struct(task
);
578 #define mem_write NULL
581 /* This is a security hazard */
582 static ssize_t
mem_write(struct file
* file
, const char * buf
,
583 size_t count
, loff_t
*ppos
)
587 struct task_struct
*task
= get_proc_task(file
->f_path
.dentry
->d_inode
);
588 unsigned long dst
= *ppos
;
594 if (!MAY_PTRACE(task
) || !ptrace_may_attach(task
))
598 page
= (char *)__get_free_page(GFP_USER
);
604 int this_len
, retval
;
606 this_len
= (count
> PAGE_SIZE
) ? PAGE_SIZE
: count
;
607 if (copy_from_user(page
, buf
, this_len
)) {
611 retval
= access_process_vm(task
, dst
, page
, this_len
, 1);
623 free_page((unsigned long) page
);
625 put_task_struct(task
);
631 static loff_t
mem_lseek(struct file
* file
, loff_t offset
, int orig
)
635 file
->f_pos
= offset
;
638 file
->f_pos
+= offset
;
643 force_successful_syscall_return();
647 static struct file_operations proc_mem_operations
= {
654 static ssize_t
oom_adjust_read(struct file
*file
, char __user
*buf
,
655 size_t count
, loff_t
*ppos
)
657 struct task_struct
*task
= get_proc_task(file
->f_path
.dentry
->d_inode
);
658 char buffer
[PROC_NUMBUF
];
661 loff_t __ppos
= *ppos
;
665 oom_adjust
= task
->oomkilladj
;
666 put_task_struct(task
);
668 len
= snprintf(buffer
, sizeof(buffer
), "%i\n", oom_adjust
);
671 if (count
> len
-__ppos
)
673 if (copy_to_user(buf
, buffer
+ __ppos
, count
))
675 *ppos
= __ppos
+ count
;
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 struct file_operations proc_oom_adjust_operations
= {
712 .read
= oom_adjust_read
,
713 .write
= oom_adjust_write
,
716 #ifdef CONFIG_AUDITSYSCALL
718 static ssize_t
proc_loginuid_read(struct file
* file
, char __user
* buf
,
719 size_t count
, loff_t
*ppos
)
721 struct inode
* inode
= file
->f_path
.dentry
->d_inode
;
722 struct task_struct
*task
= get_proc_task(inode
);
724 char tmpbuf
[TMPBUFLEN
];
728 length
= scnprintf(tmpbuf
, TMPBUFLEN
, "%u",
729 audit_get_loginuid(task
->audit_context
));
730 put_task_struct(task
);
731 return simple_read_from_buffer(buf
, count
, ppos
, tmpbuf
, length
);
734 static ssize_t
proc_loginuid_write(struct file
* file
, const char __user
* buf
,
735 size_t count
, loff_t
*ppos
)
737 struct inode
* inode
= file
->f_path
.dentry
->d_inode
;
742 if (!capable(CAP_AUDIT_CONTROL
))
745 if (current
!= pid_task(proc_pid(inode
), PIDTYPE_PID
))
748 if (count
>= PAGE_SIZE
)
749 count
= PAGE_SIZE
- 1;
752 /* No partial writes. */
755 page
= (char*)__get_free_page(GFP_USER
);
759 if (copy_from_user(page
, buf
, count
))
763 loginuid
= simple_strtoul(page
, &tmp
, 10);
769 length
= audit_set_loginuid(current
, loginuid
);
770 if (likely(length
== 0))
774 free_page((unsigned long) page
);
778 static struct file_operations proc_loginuid_operations
= {
779 .read
= proc_loginuid_read
,
780 .write
= proc_loginuid_write
,
784 #ifdef CONFIG_SECCOMP
785 static ssize_t
seccomp_read(struct file
*file
, char __user
*buf
,
786 size_t count
, loff_t
*ppos
)
788 struct task_struct
*tsk
= get_proc_task(file
->f_dentry
->d_inode
);
790 loff_t __ppos
= *ppos
;
795 /* no need to print the trailing zero, so use only len */
796 len
= sprintf(__buf
, "%u\n", tsk
->seccomp
.mode
);
797 put_task_struct(tsk
);
800 if (count
> len
- __ppos
)
801 count
= len
- __ppos
;
802 if (copy_to_user(buf
, __buf
+ __ppos
, count
))
804 *ppos
= __ppos
+ count
;
808 static ssize_t
seccomp_write(struct file
*file
, const char __user
*buf
,
809 size_t count
, loff_t
*ppos
)
811 struct task_struct
*tsk
= get_proc_task(file
->f_dentry
->d_inode
);
812 char __buf
[20], *end
;
813 unsigned int seccomp_mode
;
820 /* can set it only once to be even more secure */
822 if (unlikely(tsk
->seccomp
.mode
))
826 memset(__buf
, 0, sizeof(__buf
));
827 count
= min(count
, sizeof(__buf
) - 1);
828 if (copy_from_user(__buf
, buf
, count
))
831 seccomp_mode
= simple_strtoul(__buf
, &end
, 0);
835 if (seccomp_mode
&& seccomp_mode
<= NR_SECCOMP_MODES
) {
836 tsk
->seccomp
.mode
= seccomp_mode
;
837 set_tsk_thread_flag(tsk
, TIF_SECCOMP
);
841 if (unlikely(!(end
- __buf
)))
843 result
= end
- __buf
;
845 put_task_struct(tsk
);
850 static struct file_operations proc_seccomp_operations
= {
851 .read
= seccomp_read
,
852 .write
= seccomp_write
,
854 #endif /* CONFIG_SECCOMP */
856 static void *proc_pid_follow_link(struct dentry
*dentry
, struct nameidata
*nd
)
858 struct inode
*inode
= dentry
->d_inode
;
861 /* We don't need a base pointer in the /proc filesystem */
864 /* Are we allowed to snoop on the tasks file descriptors? */
865 if (!proc_fd_access_allowed(inode
))
868 error
= PROC_I(inode
)->op
.proc_get_link(inode
, &nd
->dentry
, &nd
->mnt
);
869 nd
->last_type
= LAST_BIND
;
871 return ERR_PTR(error
);
874 static int do_proc_readlink(struct dentry
*dentry
, struct vfsmount
*mnt
,
875 char __user
*buffer
, int buflen
)
877 struct inode
* inode
;
878 char *tmp
= (char*)__get_free_page(GFP_KERNEL
), *path
;
884 inode
= dentry
->d_inode
;
885 path
= d_path(dentry
, mnt
, tmp
, PAGE_SIZE
);
889 len
= tmp
+ PAGE_SIZE
- 1 - path
;
893 if (copy_to_user(buffer
, path
, len
))
896 free_page((unsigned long)tmp
);
900 static int proc_pid_readlink(struct dentry
* dentry
, char __user
* buffer
, int buflen
)
903 struct inode
*inode
= dentry
->d_inode
;
905 struct vfsmount
*mnt
= NULL
;
907 /* Are we allowed to snoop on the tasks file descriptors? */
908 if (!proc_fd_access_allowed(inode
))
911 error
= PROC_I(inode
)->op
.proc_get_link(inode
, &de
, &mnt
);
915 error
= do_proc_readlink(de
, mnt
, buffer
, buflen
);
922 static struct inode_operations proc_pid_link_inode_operations
= {
923 .readlink
= proc_pid_readlink
,
924 .follow_link
= proc_pid_follow_link
,
925 .setattr
= proc_setattr
,
929 /* building an inode */
931 static int task_dumpable(struct task_struct
*task
)
934 struct mm_struct
*mm
;
939 dumpable
= mm
->dumpable
;
947 static struct inode
*proc_pid_make_inode(struct super_block
* sb
, struct task_struct
*task
)
949 struct inode
* inode
;
950 struct proc_inode
*ei
;
952 /* We need a new inode */
954 inode
= new_inode(sb
);
960 inode
->i_mtime
= inode
->i_atime
= inode
->i_ctime
= CURRENT_TIME
;
961 inode
->i_op
= &proc_def_inode_operations
;
964 * grab the reference to task.
966 ei
->pid
= get_task_pid(task
, PIDTYPE_PID
);
972 if (task_dumpable(task
)) {
973 inode
->i_uid
= task
->euid
;
974 inode
->i_gid
= task
->egid
;
976 security_task_to_inode(task
, inode
);
986 static int pid_getattr(struct vfsmount
*mnt
, struct dentry
*dentry
, struct kstat
*stat
)
988 struct inode
*inode
= dentry
->d_inode
;
989 struct task_struct
*task
;
990 generic_fillattr(inode
, stat
);
995 task
= pid_task(proc_pid(inode
), PIDTYPE_PID
);
997 if ((inode
->i_mode
== (S_IFDIR
|S_IRUGO
|S_IXUGO
)) ||
998 task_dumpable(task
)) {
999 stat
->uid
= task
->euid
;
1000 stat
->gid
= task
->egid
;
1010 * Exceptional case: normally we are not allowed to unhash a busy
1011 * directory. In this case, however, we can do it - no aliasing problems
1012 * due to the way we treat inodes.
1014 * Rewrite the inode's ownerships here because the owning task may have
1015 * performed a setuid(), etc.
1017 * Before the /proc/pid/status file was created the only way to read
1018 * the effective uid of a /process was to stat /proc/pid. Reading
1019 * /proc/pid/status is slow enough that procps and other packages
1020 * kept stating /proc/pid. To keep the rules in /proc simple I have
1021 * made this apply to all per process world readable and executable
1024 static int pid_revalidate(struct dentry
*dentry
, struct nameidata
*nd
)
1026 struct inode
*inode
= dentry
->d_inode
;
1027 struct task_struct
*task
= get_proc_task(inode
);
1029 if ((inode
->i_mode
== (S_IFDIR
|S_IRUGO
|S_IXUGO
)) ||
1030 task_dumpable(task
)) {
1031 inode
->i_uid
= task
->euid
;
1032 inode
->i_gid
= task
->egid
;
1037 inode
->i_mode
&= ~(S_ISUID
| S_ISGID
);
1038 security_task_to_inode(task
, inode
);
1039 put_task_struct(task
);
1046 static int pid_delete_dentry(struct dentry
* dentry
)
1048 /* Is the task we represent dead?
1049 * If so, then don't put the dentry on the lru list,
1050 * kill it immediately.
1052 return !proc_pid(dentry
->d_inode
)->tasks
[PIDTYPE_PID
].first
;
1055 static struct dentry_operations pid_dentry_operations
=
1057 .d_revalidate
= pid_revalidate
,
1058 .d_delete
= pid_delete_dentry
,
1063 typedef struct dentry
*instantiate_t(struct inode
*, struct dentry
*, struct task_struct
*, void *);
1066 * Fill a directory entry.
1068 * If possible create the dcache entry and derive our inode number and
1069 * file type from dcache entry.
1071 * Since all of the proc inode numbers are dynamically generated, the inode
1072 * numbers do not exist until the inode is cache. This means creating the
1073 * the dcache entry in readdir is necessary to keep the inode numbers
1074 * reported by readdir in sync with the inode numbers reported
1077 static int proc_fill_cache(struct file
*filp
, void *dirent
, filldir_t filldir
,
1078 char *name
, int len
,
1079 instantiate_t instantiate
, struct task_struct
*task
, void *ptr
)
1081 struct dentry
*child
, *dir
= filp
->f_path
.dentry
;
1082 struct inode
*inode
;
1085 unsigned type
= DT_UNKNOWN
;
1089 qname
.hash
= full_name_hash(name
, len
);
1091 child
= d_lookup(dir
, &qname
);
1094 new = d_alloc(dir
, &qname
);
1096 child
= instantiate(dir
->d_inode
, new, task
, ptr
);
1103 if (!child
|| IS_ERR(child
) || !child
->d_inode
)
1104 goto end_instantiate
;
1105 inode
= child
->d_inode
;
1108 type
= inode
->i_mode
>> 12;
1113 ino
= find_inode_number(dir
, &qname
);
1116 return filldir(dirent
, name
, len
, filp
->f_pos
, ino
, type
);
1119 static unsigned name_to_int(struct dentry
*dentry
)
1121 const char *name
= dentry
->d_name
.name
;
1122 int len
= dentry
->d_name
.len
;
1125 if (len
> 1 && *name
== '0')
1128 unsigned c
= *name
++ - '0';
1131 if (n
>= (~0U-9)/10)
1141 static int proc_fd_link(struct inode
*inode
, struct dentry
**dentry
, struct vfsmount
**mnt
)
1143 struct task_struct
*task
= get_proc_task(inode
);
1144 struct files_struct
*files
= NULL
;
1146 int fd
= proc_fd(inode
);
1149 files
= get_files_struct(task
);
1150 put_task_struct(task
);
1154 * We are not taking a ref to the file structure, so we must
1157 spin_lock(&files
->file_lock
);
1158 file
= fcheck_files(files
, fd
);
1160 *mnt
= mntget(file
->f_path
.mnt
);
1161 *dentry
= dget(file
->f_path
.dentry
);
1162 spin_unlock(&files
->file_lock
);
1163 put_files_struct(files
);
1166 spin_unlock(&files
->file_lock
);
1167 put_files_struct(files
);
1172 static int tid_fd_revalidate(struct dentry
*dentry
, struct nameidata
*nd
)
1174 struct inode
*inode
= dentry
->d_inode
;
1175 struct task_struct
*task
= get_proc_task(inode
);
1176 int fd
= proc_fd(inode
);
1177 struct files_struct
*files
;
1180 files
= get_files_struct(task
);
1183 if (fcheck_files(files
, fd
)) {
1185 put_files_struct(files
);
1186 if (task_dumpable(task
)) {
1187 inode
->i_uid
= task
->euid
;
1188 inode
->i_gid
= task
->egid
;
1193 inode
->i_mode
&= ~(S_ISUID
| S_ISGID
);
1194 security_task_to_inode(task
, inode
);
1195 put_task_struct(task
);
1199 put_files_struct(files
);
1201 put_task_struct(task
);
1207 static struct dentry_operations tid_fd_dentry_operations
=
1209 .d_revalidate
= tid_fd_revalidate
,
1210 .d_delete
= pid_delete_dentry
,
1213 static struct dentry
*proc_fd_instantiate(struct inode
*dir
,
1214 struct dentry
*dentry
, struct task_struct
*task
, void *ptr
)
1216 unsigned fd
= *(unsigned *)ptr
;
1218 struct files_struct
*files
;
1219 struct inode
*inode
;
1220 struct proc_inode
*ei
;
1221 struct dentry
*error
= ERR_PTR(-ENOENT
);
1223 inode
= proc_pid_make_inode(dir
->i_sb
, task
);
1228 files
= get_files_struct(task
);
1231 inode
->i_mode
= S_IFLNK
;
1234 * We are not taking a ref to the file structure, so we must
1237 spin_lock(&files
->file_lock
);
1238 file
= fcheck_files(files
, fd
);
1241 if (file
->f_mode
& 1)
1242 inode
->i_mode
|= S_IRUSR
| S_IXUSR
;
1243 if (file
->f_mode
& 2)
1244 inode
->i_mode
|= S_IWUSR
| S_IXUSR
;
1245 spin_unlock(&files
->file_lock
);
1246 put_files_struct(files
);
1248 inode
->i_op
= &proc_pid_link_inode_operations
;
1250 ei
->op
.proc_get_link
= proc_fd_link
;
1251 dentry
->d_op
= &tid_fd_dentry_operations
;
1252 d_add(dentry
, inode
);
1253 /* Close the race of the process dying before we return the dentry */
1254 if (tid_fd_revalidate(dentry
, NULL
))
1260 spin_unlock(&files
->file_lock
);
1261 put_files_struct(files
);
1267 static struct dentry
*proc_lookupfd(struct inode
* dir
, struct dentry
* dentry
, struct nameidata
*nd
)
1269 struct task_struct
*task
= get_proc_task(dir
);
1270 unsigned fd
= name_to_int(dentry
);
1271 struct dentry
*result
= ERR_PTR(-ENOENT
);
1278 result
= proc_fd_instantiate(dir
, dentry
, task
, &fd
);
1280 put_task_struct(task
);
1285 static int proc_fd_fill_cache(struct file
*filp
, void *dirent
, filldir_t filldir
,
1286 struct task_struct
*task
, int fd
)
1288 char name
[PROC_NUMBUF
];
1289 int len
= snprintf(name
, sizeof(name
), "%d", fd
);
1290 return proc_fill_cache(filp
, dirent
, filldir
, name
, len
,
1291 proc_fd_instantiate
, task
, &fd
);
1294 static int proc_readfd(struct file
* filp
, void * dirent
, filldir_t filldir
)
1296 struct dentry
*dentry
= filp
->f_path
.dentry
;
1297 struct inode
*inode
= dentry
->d_inode
;
1298 struct task_struct
*p
= get_proc_task(inode
);
1299 unsigned int fd
, tid
, ino
;
1301 struct files_struct
* files
;
1302 struct fdtable
*fdt
;
1313 if (filldir(dirent
, ".", 1, 0, inode
->i_ino
, DT_DIR
) < 0)
1317 ino
= parent_ino(dentry
);
1318 if (filldir(dirent
, "..", 2, 1, ino
, DT_DIR
) < 0)
1322 files
= get_files_struct(p
);
1326 fdt
= files_fdtable(files
);
1327 for (fd
= filp
->f_pos
-2;
1329 fd
++, filp
->f_pos
++) {
1331 if (!fcheck_files(files
, fd
))
1335 if (proc_fd_fill_cache(filp
, dirent
, filldir
, p
, fd
) < 0) {
1342 put_files_struct(files
);
1350 static struct file_operations proc_fd_operations
= {
1351 .read
= generic_read_dir
,
1352 .readdir
= proc_readfd
,
1356 * proc directories can do almost nothing..
1358 static struct inode_operations proc_fd_inode_operations
= {
1359 .lookup
= proc_lookupfd
,
1360 .setattr
= proc_setattr
,
1363 static struct dentry
*proc_pident_instantiate(struct inode
*dir
,
1364 struct dentry
*dentry
, struct task_struct
*task
, void *ptr
)
1366 struct pid_entry
*p
= ptr
;
1367 struct inode
*inode
;
1368 struct proc_inode
*ei
;
1369 struct dentry
*error
= ERR_PTR(-EINVAL
);
1371 inode
= proc_pid_make_inode(dir
->i_sb
, task
);
1376 inode
->i_mode
= p
->mode
;
1377 if (S_ISDIR(inode
->i_mode
))
1378 inode
->i_nlink
= 2; /* Use getattr to fix if necessary */
1380 inode
->i_op
= p
->iop
;
1382 inode
->i_fop
= p
->fop
;
1384 dentry
->d_op
= &pid_dentry_operations
;
1385 d_add(dentry
, inode
);
1386 /* Close the race of the process dying before we return the dentry */
1387 if (pid_revalidate(dentry
, NULL
))
1393 static struct dentry
*proc_pident_lookup(struct inode
*dir
,
1394 struct dentry
*dentry
,
1395 struct pid_entry
*ents
,
1398 struct inode
*inode
;
1399 struct dentry
*error
;
1400 struct task_struct
*task
= get_proc_task(dir
);
1401 struct pid_entry
*p
, *last
;
1403 error
= ERR_PTR(-ENOENT
);
1410 * Yes, it does not scale. And it should not. Don't add
1411 * new entries into /proc/<tgid>/ without very good reasons.
1413 last
= &ents
[nents
- 1];
1414 for (p
= ents
; p
<= last
; p
++) {
1415 if (p
->len
!= dentry
->d_name
.len
)
1417 if (!memcmp(dentry
->d_name
.name
, p
->name
, p
->len
))
1423 error
= proc_pident_instantiate(dir
, dentry
, task
, p
);
1425 put_task_struct(task
);
1430 static int proc_pident_fill_cache(struct file
*filp
, void *dirent
, filldir_t filldir
,
1431 struct task_struct
*task
, struct pid_entry
*p
)
1433 return proc_fill_cache(filp
, dirent
, filldir
, p
->name
, p
->len
,
1434 proc_pident_instantiate
, task
, p
);
1437 static int proc_pident_readdir(struct file
*filp
,
1438 void *dirent
, filldir_t filldir
,
1439 struct pid_entry
*ents
, unsigned int nents
)
1443 struct dentry
*dentry
= filp
->f_path
.dentry
;
1444 struct inode
*inode
= dentry
->d_inode
;
1445 struct task_struct
*task
= get_proc_task(inode
);
1446 struct pid_entry
*p
, *last
;
1460 if (filldir(dirent
, ".", 1, i
, ino
, DT_DIR
) < 0)
1466 ino
= parent_ino(dentry
);
1467 if (filldir(dirent
, "..", 2, i
, ino
, DT_DIR
) < 0)
1479 last
= &ents
[nents
- 1];
1481 if (proc_pident_fill_cache(filp
, dirent
, filldir
, task
, p
) < 0)
1490 put_task_struct(task
);
1495 #ifdef CONFIG_SECURITY
1496 static ssize_t
proc_pid_attr_read(struct file
* file
, char __user
* buf
,
1497 size_t count
, loff_t
*ppos
)
1499 struct inode
* inode
= file
->f_path
.dentry
->d_inode
;
1502 struct task_struct
*task
= get_proc_task(inode
);
1508 if (count
> PAGE_SIZE
)
1511 if (!(page
= __get_free_page(GFP_KERNEL
)))
1514 length
= security_getprocattr(task
,
1515 (char*)file
->f_path
.dentry
->d_name
.name
,
1516 (void*)page
, count
);
1518 length
= simple_read_from_buffer(buf
, count
, ppos
, (char *)page
, length
);
1521 put_task_struct(task
);
1526 static ssize_t
proc_pid_attr_write(struct file
* file
, const char __user
* buf
,
1527 size_t count
, loff_t
*ppos
)
1529 struct inode
* inode
= file
->f_path
.dentry
->d_inode
;
1532 struct task_struct
*task
= get_proc_task(inode
);
1537 if (count
> PAGE_SIZE
)
1540 /* No partial writes. */
1546 page
= (char*)__get_free_page(GFP_USER
);
1551 if (copy_from_user(page
, buf
, count
))
1554 length
= security_setprocattr(task
,
1555 (char*)file
->f_path
.dentry
->d_name
.name
,
1556 (void*)page
, count
);
1558 free_page((unsigned long) page
);
1560 put_task_struct(task
);
1565 static struct file_operations proc_pid_attr_operations
= {
1566 .read
= proc_pid_attr_read
,
1567 .write
= proc_pid_attr_write
,
1570 static struct pid_entry attr_dir_stuff
[] = {
1571 REG("current", S_IRUGO
|S_IWUGO
, pid_attr
),
1572 REG("prev", S_IRUGO
, pid_attr
),
1573 REG("exec", S_IRUGO
|S_IWUGO
, pid_attr
),
1574 REG("fscreate", S_IRUGO
|S_IWUGO
, pid_attr
),
1575 REG("keycreate", S_IRUGO
|S_IWUGO
, pid_attr
),
1576 REG("sockcreate", S_IRUGO
|S_IWUGO
, pid_attr
),
1579 static int proc_attr_dir_readdir(struct file
* filp
,
1580 void * dirent
, filldir_t filldir
)
1582 return proc_pident_readdir(filp
,dirent
,filldir
,
1583 attr_dir_stuff
,ARRAY_SIZE(attr_dir_stuff
));
1586 static struct file_operations proc_attr_dir_operations
= {
1587 .read
= generic_read_dir
,
1588 .readdir
= proc_attr_dir_readdir
,
1591 static struct dentry
*proc_attr_dir_lookup(struct inode
*dir
,
1592 struct dentry
*dentry
, struct nameidata
*nd
)
1594 return proc_pident_lookup(dir
, dentry
,
1595 attr_dir_stuff
, ARRAY_SIZE(attr_dir_stuff
));
1598 static struct inode_operations proc_attr_dir_inode_operations
= {
1599 .lookup
= proc_attr_dir_lookup
,
1600 .getattr
= pid_getattr
,
1601 .setattr
= proc_setattr
,
1609 static int proc_self_readlink(struct dentry
*dentry
, char __user
*buffer
,
1612 char tmp
[PROC_NUMBUF
];
1613 sprintf(tmp
, "%d", current
->tgid
);
1614 return vfs_readlink(dentry
,buffer
,buflen
,tmp
);
1617 static void *proc_self_follow_link(struct dentry
*dentry
, struct nameidata
*nd
)
1619 char tmp
[PROC_NUMBUF
];
1620 sprintf(tmp
, "%d", current
->tgid
);
1621 return ERR_PTR(vfs_follow_link(nd
,tmp
));
1624 static struct inode_operations proc_self_inode_operations
= {
1625 .readlink
= proc_self_readlink
,
1626 .follow_link
= proc_self_follow_link
,
1632 * These are the directory entries in the root directory of /proc
1633 * that properly belong to the /proc filesystem, as they describe
1634 * describe something that is process related.
1636 static struct pid_entry proc_base_stuff
[] = {
1637 NOD("self", S_IFLNK
|S_IRWXUGO
,
1638 &proc_self_inode_operations
, NULL
, {}),
1642 * Exceptional case: normally we are not allowed to unhash a busy
1643 * directory. In this case, however, we can do it - no aliasing problems
1644 * due to the way we treat inodes.
1646 static int proc_base_revalidate(struct dentry
*dentry
, struct nameidata
*nd
)
1648 struct inode
*inode
= dentry
->d_inode
;
1649 struct task_struct
*task
= get_proc_task(inode
);
1651 put_task_struct(task
);
1658 static struct dentry_operations proc_base_dentry_operations
=
1660 .d_revalidate
= proc_base_revalidate
,
1661 .d_delete
= pid_delete_dentry
,
1664 static struct dentry
*proc_base_instantiate(struct inode
*dir
,
1665 struct dentry
*dentry
, struct task_struct
*task
, void *ptr
)
1667 struct pid_entry
*p
= ptr
;
1668 struct inode
*inode
;
1669 struct proc_inode
*ei
;
1670 struct dentry
*error
= ERR_PTR(-EINVAL
);
1672 /* Allocate the inode */
1673 error
= ERR_PTR(-ENOMEM
);
1674 inode
= new_inode(dir
->i_sb
);
1678 /* Initialize the inode */
1680 inode
->i_mtime
= inode
->i_atime
= inode
->i_ctime
= CURRENT_TIME
;
1683 * grab the reference to the task.
1685 ei
->pid
= get_task_pid(task
, PIDTYPE_PID
);
1691 inode
->i_mode
= p
->mode
;
1692 if (S_ISDIR(inode
->i_mode
))
1694 if (S_ISLNK(inode
->i_mode
))
1697 inode
->i_op
= p
->iop
;
1699 inode
->i_fop
= p
->fop
;
1701 dentry
->d_op
= &proc_base_dentry_operations
;
1702 d_add(dentry
, inode
);
1711 static struct dentry
*proc_base_lookup(struct inode
*dir
, struct dentry
*dentry
)
1713 struct dentry
*error
;
1714 struct task_struct
*task
= get_proc_task(dir
);
1715 struct pid_entry
*p
, *last
;
1717 error
= ERR_PTR(-ENOENT
);
1722 /* Lookup the directory entry */
1723 last
= &proc_base_stuff
[ARRAY_SIZE(proc_base_stuff
) - 1];
1724 for (p
= proc_base_stuff
; p
<= last
; p
++) {
1725 if (p
->len
!= dentry
->d_name
.len
)
1727 if (!memcmp(dentry
->d_name
.name
, p
->name
, p
->len
))
1733 error
= proc_base_instantiate(dir
, dentry
, task
, p
);
1736 put_task_struct(task
);
1741 static int proc_base_fill_cache(struct file
*filp
, void *dirent
, filldir_t filldir
,
1742 struct task_struct
*task
, struct pid_entry
*p
)
1744 return proc_fill_cache(filp
, dirent
, filldir
, p
->name
, p
->len
,
1745 proc_base_instantiate
, task
, p
);
1751 static struct file_operations proc_task_operations
;
1752 static struct inode_operations proc_task_inode_operations
;
1754 static struct pid_entry tgid_base_stuff
[] = {
1755 DIR("task", S_IRUGO
|S_IXUGO
, task
),
1756 DIR("fd", S_IRUSR
|S_IXUSR
, fd
),
1757 INF("environ", S_IRUSR
, pid_environ
),
1758 INF("auxv", S_IRUSR
, pid_auxv
),
1759 INF("status", S_IRUGO
, pid_status
),
1760 INF("cmdline", S_IRUGO
, pid_cmdline
),
1761 INF("stat", S_IRUGO
, tgid_stat
),
1762 INF("statm", S_IRUGO
, pid_statm
),
1763 REG("maps", S_IRUGO
, maps
),
1765 REG("numa_maps", S_IRUGO
, numa_maps
),
1767 REG("mem", S_IRUSR
|S_IWUSR
, mem
),
1768 #ifdef CONFIG_SECCOMP
1769 REG("seccomp", S_IRUSR
|S_IWUSR
, seccomp
),
1774 REG("mounts", S_IRUGO
, mounts
),
1775 REG("mountstats", S_IRUSR
, mountstats
),
1777 REG("smaps", S_IRUGO
, smaps
),
1779 #ifdef CONFIG_SECURITY
1780 DIR("attr", S_IRUGO
|S_IXUGO
, attr_dir
),
1782 #ifdef CONFIG_KALLSYMS
1783 INF("wchan", S_IRUGO
, pid_wchan
),
1785 #ifdef CONFIG_SCHEDSTATS
1786 INF("schedstat", S_IRUGO
, pid_schedstat
),
1788 #ifdef CONFIG_CPUSETS
1789 REG("cpuset", S_IRUGO
, cpuset
),
1791 INF("oom_score", S_IRUGO
, oom_score
),
1792 REG("oom_adj", S_IRUGO
|S_IWUSR
, oom_adjust
),
1793 #ifdef CONFIG_AUDITSYSCALL
1794 REG("loginuid", S_IWUSR
|S_IRUGO
, loginuid
),
1798 static int proc_tgid_base_readdir(struct file
* filp
,
1799 void * dirent
, filldir_t filldir
)
1801 return proc_pident_readdir(filp
,dirent
,filldir
,
1802 tgid_base_stuff
,ARRAY_SIZE(tgid_base_stuff
));
1805 static struct file_operations proc_tgid_base_operations
= {
1806 .read
= generic_read_dir
,
1807 .readdir
= proc_tgid_base_readdir
,
1810 static struct dentry
*proc_tgid_base_lookup(struct inode
*dir
, struct dentry
*dentry
, struct nameidata
*nd
){
1811 return proc_pident_lookup(dir
, dentry
,
1812 tgid_base_stuff
, ARRAY_SIZE(tgid_base_stuff
));
1815 static struct inode_operations proc_tgid_base_inode_operations
= {
1816 .lookup
= proc_tgid_base_lookup
,
1817 .getattr
= pid_getattr
,
1818 .setattr
= proc_setattr
,
1822 * proc_flush_task - Remove dcache entries for @task from the /proc dcache.
1824 * @task: task that should be flushed.
1826 * Looks in the dcache for
1828 * /proc/@tgid/task/@pid
1829 * if either directory is present flushes it and all of it'ts children
1832 * It is safe and reasonable to cache /proc entries for a task until
1833 * that task exits. After that they just clog up the dcache with
1834 * useless entries, possibly causing useful dcache entries to be
1835 * flushed instead. This routine is proved to flush those useless
1836 * dcache entries at process exit time.
1838 * NOTE: This routine is just an optimization so it does not guarantee
1839 * that no dcache entries will exist at process exit time it
1840 * just makes it very unlikely that any will persist.
1842 void proc_flush_task(struct task_struct
*task
)
1844 struct dentry
*dentry
, *leader
, *dir
;
1845 char buf
[PROC_NUMBUF
];
1849 name
.len
= snprintf(buf
, sizeof(buf
), "%d", task
->pid
);
1850 dentry
= d_hash_and_lookup(proc_mnt
->mnt_root
, &name
);
1852 shrink_dcache_parent(dentry
);
1857 if (thread_group_leader(task
))
1861 name
.len
= snprintf(buf
, sizeof(buf
), "%d", task
->tgid
);
1862 leader
= d_hash_and_lookup(proc_mnt
->mnt_root
, &name
);
1867 name
.len
= strlen(name
.name
);
1868 dir
= d_hash_and_lookup(leader
, &name
);
1870 goto out_put_leader
;
1873 name
.len
= snprintf(buf
, sizeof(buf
), "%d", task
->pid
);
1874 dentry
= d_hash_and_lookup(dir
, &name
);
1876 shrink_dcache_parent(dentry
);
1888 static struct dentry
*proc_pid_instantiate(struct inode
*dir
,
1889 struct dentry
* dentry
,
1890 struct task_struct
*task
, void *ptr
)
1892 struct dentry
*error
= ERR_PTR(-ENOENT
);
1893 struct inode
*inode
;
1895 inode
= proc_pid_make_inode(dir
->i_sb
, task
);
1899 inode
->i_mode
= S_IFDIR
|S_IRUGO
|S_IXUGO
;
1900 inode
->i_op
= &proc_tgid_base_inode_operations
;
1901 inode
->i_fop
= &proc_tgid_base_operations
;
1902 inode
->i_flags
|=S_IMMUTABLE
;
1904 #ifdef CONFIG_SECURITY
1905 inode
->i_nlink
+= 1;
1908 dentry
->d_op
= &pid_dentry_operations
;
1910 d_add(dentry
, inode
);
1911 /* Close the race of the process dying before we return the dentry */
1912 if (pid_revalidate(dentry
, NULL
))
1918 struct dentry
*proc_pid_lookup(struct inode
*dir
, struct dentry
* dentry
, struct nameidata
*nd
)
1920 struct dentry
*result
= ERR_PTR(-ENOENT
);
1921 struct task_struct
*task
;
1924 result
= proc_base_lookup(dir
, dentry
);
1925 if (!IS_ERR(result
) || PTR_ERR(result
) != -ENOENT
)
1928 tgid
= name_to_int(dentry
);
1933 task
= find_task_by_pid(tgid
);
1935 get_task_struct(task
);
1940 result
= proc_pid_instantiate(dir
, dentry
, task
, NULL
);
1941 put_task_struct(task
);
1947 * Find the first task with tgid >= tgid
1950 static struct task_struct
*next_tgid(unsigned int tgid
)
1952 struct task_struct
*task
;
1958 pid
= find_ge_pid(tgid
);
1961 task
= pid_task(pid
, PIDTYPE_PID
);
1962 /* What we to know is if the pid we have find is the
1963 * pid of a thread_group_leader. Testing for task
1964 * being a thread_group_leader is the obvious thing
1965 * todo but there is a window when it fails, due to
1966 * the pid transfer logic in de_thread.
1968 * So we perform the straight forward test of seeing
1969 * if the pid we have found is the pid of a thread
1970 * group leader, and don't worry if the task we have
1971 * found doesn't happen to be a thread group leader.
1972 * As we don't care in the case of readdir.
1974 if (!task
|| !has_group_leader_pid(task
))
1976 get_task_struct(task
);
1982 #define TGID_OFFSET (FIRST_PROCESS_ENTRY + ARRAY_SIZE(proc_base_stuff))
1984 static int proc_pid_fill_cache(struct file
*filp
, void *dirent
, filldir_t filldir
,
1985 struct task_struct
*task
, int tgid
)
1987 char name
[PROC_NUMBUF
];
1988 int len
= snprintf(name
, sizeof(name
), "%d", tgid
);
1989 return proc_fill_cache(filp
, dirent
, filldir
, name
, len
,
1990 proc_pid_instantiate
, task
, NULL
);
1993 /* for the /proc/ directory itself, after non-process stuff has been done */
1994 int proc_pid_readdir(struct file
* filp
, void * dirent
, filldir_t filldir
)
1996 unsigned int nr
= filp
->f_pos
- FIRST_PROCESS_ENTRY
;
1997 struct task_struct
*reaper
= get_proc_task(filp
->f_path
.dentry
->d_inode
);
1998 struct task_struct
*task
;
2004 for (; nr
< ARRAY_SIZE(proc_base_stuff
); filp
->f_pos
++, nr
++) {
2005 struct pid_entry
*p
= &proc_base_stuff
[nr
];
2006 if (proc_base_fill_cache(filp
, dirent
, filldir
, reaper
, p
) < 0)
2010 tgid
= filp
->f_pos
- TGID_OFFSET
;
2011 for (task
= next_tgid(tgid
);
2013 put_task_struct(task
), task
= next_tgid(tgid
+ 1)) {
2015 filp
->f_pos
= tgid
+ TGID_OFFSET
;
2016 if (proc_pid_fill_cache(filp
, dirent
, filldir
, task
, tgid
) < 0) {
2017 put_task_struct(task
);
2021 filp
->f_pos
= PID_MAX_LIMIT
+ TGID_OFFSET
;
2023 put_task_struct(reaper
);
2031 static struct pid_entry tid_base_stuff
[] = {
2032 DIR("fd", S_IRUSR
|S_IXUSR
, fd
),
2033 INF("environ", S_IRUSR
, pid_environ
),
2034 INF("auxv", S_IRUSR
, pid_auxv
),
2035 INF("status", S_IRUGO
, pid_status
),
2036 INF("cmdline", S_IRUGO
, pid_cmdline
),
2037 INF("stat", S_IRUGO
, tid_stat
),
2038 INF("statm", S_IRUGO
, pid_statm
),
2039 REG("maps", S_IRUGO
, maps
),
2041 REG("numa_maps", S_IRUGO
, numa_maps
),
2043 REG("mem", S_IRUSR
|S_IWUSR
, mem
),
2044 #ifdef CONFIG_SECCOMP
2045 REG("seccomp", S_IRUSR
|S_IWUSR
, seccomp
),
2050 REG("mounts", S_IRUGO
, mounts
),
2052 REG("smaps", S_IRUGO
, smaps
),
2054 #ifdef CONFIG_SECURITY
2055 DIR("attr", S_IRUGO
|S_IXUGO
, attr_dir
),
2057 #ifdef CONFIG_KALLSYMS
2058 INF("wchan", S_IRUGO
, pid_wchan
),
2060 #ifdef CONFIG_SCHEDSTATS
2061 INF("schedstat", S_IRUGO
, pid_schedstat
),
2063 #ifdef CONFIG_CPUSETS
2064 REG("cpuset", S_IRUGO
, cpuset
),
2066 INF("oom_score", S_IRUGO
, oom_score
),
2067 REG("oom_adj", S_IRUGO
|S_IWUSR
, oom_adjust
),
2068 #ifdef CONFIG_AUDITSYSCALL
2069 REG("loginuid", S_IWUSR
|S_IRUGO
, loginuid
),
2073 static int proc_tid_base_readdir(struct file
* filp
,
2074 void * dirent
, filldir_t filldir
)
2076 return proc_pident_readdir(filp
,dirent
,filldir
,
2077 tid_base_stuff
,ARRAY_SIZE(tid_base_stuff
));
2080 static struct dentry
*proc_tid_base_lookup(struct inode
*dir
, struct dentry
*dentry
, struct nameidata
*nd
){
2081 return proc_pident_lookup(dir
, dentry
,
2082 tid_base_stuff
, ARRAY_SIZE(tid_base_stuff
));
2085 static struct file_operations proc_tid_base_operations
= {
2086 .read
= generic_read_dir
,
2087 .readdir
= proc_tid_base_readdir
,
2090 static struct inode_operations proc_tid_base_inode_operations
= {
2091 .lookup
= proc_tid_base_lookup
,
2092 .getattr
= pid_getattr
,
2093 .setattr
= proc_setattr
,
2096 static struct dentry
*proc_task_instantiate(struct inode
*dir
,
2097 struct dentry
*dentry
, struct task_struct
*task
, void *ptr
)
2099 struct dentry
*error
= ERR_PTR(-ENOENT
);
2100 struct inode
*inode
;
2101 inode
= proc_pid_make_inode(dir
->i_sb
, task
);
2105 inode
->i_mode
= S_IFDIR
|S_IRUGO
|S_IXUGO
;
2106 inode
->i_op
= &proc_tid_base_inode_operations
;
2107 inode
->i_fop
= &proc_tid_base_operations
;
2108 inode
->i_flags
|=S_IMMUTABLE
;
2110 #ifdef CONFIG_SECURITY
2111 inode
->i_nlink
+= 1;
2114 dentry
->d_op
= &pid_dentry_operations
;
2116 d_add(dentry
, inode
);
2117 /* Close the race of the process dying before we return the dentry */
2118 if (pid_revalidate(dentry
, NULL
))
2124 static struct dentry
*proc_task_lookup(struct inode
*dir
, struct dentry
* dentry
, struct nameidata
*nd
)
2126 struct dentry
*result
= ERR_PTR(-ENOENT
);
2127 struct task_struct
*task
;
2128 struct task_struct
*leader
= get_proc_task(dir
);
2134 tid
= name_to_int(dentry
);
2139 task
= find_task_by_pid(tid
);
2141 get_task_struct(task
);
2145 if (leader
->tgid
!= task
->tgid
)
2148 result
= proc_task_instantiate(dir
, dentry
, task
, NULL
);
2150 put_task_struct(task
);
2152 put_task_struct(leader
);
2158 * Find the first tid of a thread group to return to user space.
2160 * Usually this is just the thread group leader, but if the users
2161 * buffer was too small or there was a seek into the middle of the
2162 * directory we have more work todo.
2164 * In the case of a short read we start with find_task_by_pid.
2166 * In the case of a seek we start with the leader and walk nr
2169 static struct task_struct
*first_tid(struct task_struct
*leader
,
2172 struct task_struct
*pos
;
2175 /* Attempt to start with the pid of a thread */
2176 if (tid
&& (nr
> 0)) {
2177 pos
= find_task_by_pid(tid
);
2178 if (pos
&& (pos
->group_leader
== leader
))
2182 /* If nr exceeds the number of threads there is nothing todo */
2184 if (nr
&& nr
>= get_nr_threads(leader
))
2187 /* If we haven't found our starting place yet start
2188 * with the leader and walk nr threads forward.
2190 for (pos
= leader
; nr
> 0; --nr
) {
2191 pos
= next_thread(pos
);
2192 if (pos
== leader
) {
2198 get_task_struct(pos
);
2205 * Find the next thread in the thread list.
2206 * Return NULL if there is an error or no next thread.
2208 * The reference to the input task_struct is released.
2210 static struct task_struct
*next_tid(struct task_struct
*start
)
2212 struct task_struct
*pos
= NULL
;
2214 if (pid_alive(start
)) {
2215 pos
= next_thread(start
);
2216 if (thread_group_leader(pos
))
2219 get_task_struct(pos
);
2222 put_task_struct(start
);
2226 static int proc_task_fill_cache(struct file
*filp
, void *dirent
, filldir_t filldir
,
2227 struct task_struct
*task
, int tid
)
2229 char name
[PROC_NUMBUF
];
2230 int len
= snprintf(name
, sizeof(name
), "%d", tid
);
2231 return proc_fill_cache(filp
, dirent
, filldir
, name
, len
,
2232 proc_task_instantiate
, task
, NULL
);
2235 /* for the /proc/TGID/task/ directories */
2236 static int proc_task_readdir(struct file
* filp
, void * dirent
, filldir_t filldir
)
2238 struct dentry
*dentry
= filp
->f_path
.dentry
;
2239 struct inode
*inode
= dentry
->d_inode
;
2240 struct task_struct
*leader
= get_proc_task(inode
);
2241 struct task_struct
*task
;
2242 int retval
= -ENOENT
;
2245 unsigned long pos
= filp
->f_pos
; /* avoiding "long long" filp->f_pos */
2254 if (filldir(dirent
, ".", 1, pos
, ino
, DT_DIR
) < 0)
2259 ino
= parent_ino(dentry
);
2260 if (filldir(dirent
, "..", 2, pos
, ino
, DT_DIR
) < 0)
2266 /* f_version caches the tgid value that the last readdir call couldn't
2267 * return. lseek aka telldir automagically resets f_version to 0.
2269 tid
= filp
->f_version
;
2270 filp
->f_version
= 0;
2271 for (task
= first_tid(leader
, tid
, pos
- 2);
2273 task
= next_tid(task
), pos
++) {
2275 if (proc_task_fill_cache(filp
, dirent
, filldir
, task
, tid
) < 0) {
2276 /* returning this tgid failed, save it as the first
2277 * pid for the next readir call */
2278 filp
->f_version
= tid
;
2279 put_task_struct(task
);
2285 put_task_struct(leader
);
2290 static int proc_task_getattr(struct vfsmount
*mnt
, struct dentry
*dentry
, struct kstat
*stat
)
2292 struct inode
*inode
= dentry
->d_inode
;
2293 struct task_struct
*p
= get_proc_task(inode
);
2294 generic_fillattr(inode
, stat
);
2298 stat
->nlink
+= get_nr_threads(p
);
2306 static struct inode_operations proc_task_inode_operations
= {
2307 .lookup
= proc_task_lookup
,
2308 .getattr
= proc_task_getattr
,
2309 .setattr
= proc_setattr
,
2312 static struct file_operations proc_task_operations
= {
2313 .read
= generic_read_dir
,
2314 .readdir
= proc_task_readdir
,