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/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>
78 * Implementing inode permission operations in /proc is almost
79 * certainly an error. Permission checks need to happen during
80 * each system call not at open time. The reason is that most of
81 * what we wish to check for permissions in /proc varies at runtime.
83 * The classic example of a problem is opening file descriptors
84 * in /proc for a task before it execs a suid executable.
88 * For hysterical raisins we keep the same inumbers as in the old procfs.
89 * Feel free to change the macro below - just keep the range distinct from
90 * inumbers of the rest of procfs (currently those are in 0x0000--0xffff).
91 * As soon as we'll get a separate superblock we will be able to forget
92 * about magical ranges too.
95 #define fake_ino(pid,ino) (((pid)<<16)|(ino))
97 enum pid_directory_inos
{
102 #ifdef CONFIG_SECCOMP
117 PROC_TGID_MOUNTSTATS
,
122 #ifdef CONFIG_SCHEDSTATS
125 #ifdef CONFIG_CPUSETS
128 #ifdef CONFIG_SECURITY
130 PROC_TGID_ATTR_CURRENT
,
133 PROC_TGID_ATTR_FSCREATE
,
134 PROC_TGID_ATTR_KEYCREATE
,
135 PROC_TGID_ATTR_SOCKCREATE
,
137 #ifdef CONFIG_AUDITSYSCALL
141 PROC_TGID_OOM_ADJUST
,
145 #ifdef CONFIG_SECCOMP
165 #ifdef CONFIG_SCHEDSTATS
168 #ifdef CONFIG_CPUSETS
171 #ifdef CONFIG_SECURITY
173 PROC_TID_ATTR_CURRENT
,
176 PROC_TID_ATTR_FSCREATE
,
177 PROC_TID_ATTR_KEYCREATE
,
178 PROC_TID_ATTR_SOCKCREATE
,
180 #ifdef CONFIG_AUDITSYSCALL
186 /* Add new entries before this */
187 PROC_TID_FD_DIR
= 0x8000, /* 0x8000-0xffff */
190 /* Worst case buffer size needed for holding an integer. */
191 #define PROC_NUMBUF 10
198 struct inode_operations
*iop
;
199 struct file_operations
*fop
;
203 #define NOD(TYPE, NAME, MODE, IOP, FOP, OP) { \
205 .len = sizeof(NAME) - 1, \
213 #define DIR(TYPE, NAME, MODE, OTYPE) \
214 NOD(TYPE, NAME, (S_IFDIR|(MODE)), \
215 &proc_##OTYPE##_inode_operations, &proc_##OTYPE##_operations, \
217 #define LNK(TYPE, NAME, OTYPE) \
218 NOD(TYPE, NAME, (S_IFLNK|S_IRWXUGO), \
219 &proc_pid_link_inode_operations, NULL, \
220 { .proc_get_link = &proc_##OTYPE##_link } )
221 #define REG(TYPE, NAME, MODE, OTYPE) \
222 NOD(TYPE, NAME, (S_IFREG|(MODE)), NULL, \
223 &proc_##OTYPE##_operations, {})
224 #define INF(TYPE, NAME, MODE, OTYPE) \
225 NOD(TYPE, NAME, (S_IFREG|(MODE)), \
226 NULL, &proc_info_file_operations, \
227 { .proc_read = &proc_##OTYPE } )
229 static struct fs_struct
*get_fs_struct(struct task_struct
*task
)
231 struct fs_struct
*fs
;
235 atomic_inc(&fs
->count
);
240 static int get_nr_threads(struct task_struct
*tsk
)
242 /* Must be called with the rcu_read_lock held */
246 if (lock_task_sighand(tsk
, &flags
)) {
247 count
= atomic_read(&tsk
->signal
->count
);
248 unlock_task_sighand(tsk
, &flags
);
253 static int proc_cwd_link(struct inode
*inode
, struct dentry
**dentry
, struct vfsmount
**mnt
)
255 struct task_struct
*task
= get_proc_task(inode
);
256 struct fs_struct
*fs
= NULL
;
257 int result
= -ENOENT
;
260 fs
= get_fs_struct(task
);
261 put_task_struct(task
);
264 read_lock(&fs
->lock
);
265 *mnt
= mntget(fs
->pwdmnt
);
266 *dentry
= dget(fs
->pwd
);
267 read_unlock(&fs
->lock
);
274 static int proc_root_link(struct inode
*inode
, struct dentry
**dentry
, struct vfsmount
**mnt
)
276 struct task_struct
*task
= get_proc_task(inode
);
277 struct fs_struct
*fs
= NULL
;
278 int result
= -ENOENT
;
281 fs
= get_fs_struct(task
);
282 put_task_struct(task
);
285 read_lock(&fs
->lock
);
286 *mnt
= mntget(fs
->rootmnt
);
287 *dentry
= dget(fs
->root
);
288 read_unlock(&fs
->lock
);
295 #define MAY_PTRACE(task) \
296 (task == current || \
297 (task->parent == current && \
298 (task->ptrace & PT_PTRACED) && \
299 (task->state == TASK_STOPPED || task->state == TASK_TRACED) && \
300 security_ptrace(current,task) == 0))
302 static int proc_pid_environ(struct task_struct
*task
, char * buffer
)
305 struct mm_struct
*mm
= get_task_mm(task
);
307 unsigned int len
= mm
->env_end
- mm
->env_start
;
310 res
= access_process_vm(task
, mm
->env_start
, buffer
, len
, 0);
311 if (!ptrace_may_attach(task
))
318 static int proc_pid_cmdline(struct task_struct
*task
, char * buffer
)
322 struct mm_struct
*mm
= get_task_mm(task
);
326 goto out_mm
; /* Shh! No looking before we're done */
328 len
= mm
->arg_end
- mm
->arg_start
;
333 res
= access_process_vm(task
, mm
->arg_start
, buffer
, len
, 0);
335 // If the nul at the end of args has been overwritten, then
336 // assume application is using setproctitle(3).
337 if (res
> 0 && buffer
[res
-1] != '\0' && len
< PAGE_SIZE
) {
338 len
= strnlen(buffer
, res
);
342 len
= mm
->env_end
- mm
->env_start
;
343 if (len
> PAGE_SIZE
- res
)
344 len
= PAGE_SIZE
- res
;
345 res
+= access_process_vm(task
, mm
->env_start
, buffer
+res
, len
, 0);
346 res
= strnlen(buffer
, res
);
355 static int proc_pid_auxv(struct task_struct
*task
, char *buffer
)
358 struct mm_struct
*mm
= get_task_mm(task
);
360 unsigned int nwords
= 0;
363 while (mm
->saved_auxv
[nwords
- 2] != 0); /* AT_NULL */
364 res
= nwords
* sizeof(mm
->saved_auxv
[0]);
367 memcpy(buffer
, mm
->saved_auxv
, res
);
374 #ifdef CONFIG_KALLSYMS
376 * Provides a wchan file via kallsyms in a proper one-value-per-file format.
377 * Returns the resolved symbol. If that fails, simply return the address.
379 static int proc_pid_wchan(struct task_struct
*task
, char *buffer
)
382 const char *sym_name
;
383 unsigned long wchan
, size
, offset
;
384 char namebuf
[KSYM_NAME_LEN
+1];
386 wchan
= get_wchan(task
);
388 sym_name
= kallsyms_lookup(wchan
, &size
, &offset
, &modname
, namebuf
);
390 return sprintf(buffer
, "%s", sym_name
);
391 return sprintf(buffer
, "%lu", wchan
);
393 #endif /* CONFIG_KALLSYMS */
395 #ifdef CONFIG_SCHEDSTATS
397 * Provides /proc/PID/schedstat
399 static int proc_pid_schedstat(struct task_struct
*task
, char *buffer
)
401 return sprintf(buffer
, "%lu %lu %lu\n",
402 task
->sched_info
.cpu_time
,
403 task
->sched_info
.run_delay
,
404 task
->sched_info
.pcnt
);
408 /* The badness from the OOM killer */
409 unsigned long badness(struct task_struct
*p
, unsigned long uptime
);
410 static int proc_oom_score(struct task_struct
*task
, char *buffer
)
412 unsigned long points
;
413 struct timespec uptime
;
415 do_posix_clock_monotonic_gettime(&uptime
);
416 points
= badness(task
, uptime
.tv_sec
);
417 return sprintf(buffer
, "%lu\n", points
);
420 /************************************************************************/
421 /* Here the fs part begins */
422 /************************************************************************/
424 /* permission checks */
425 static int proc_fd_access_allowed(struct inode
*inode
)
427 struct task_struct
*task
;
429 /* Allow access to a task's file descriptors if it is us or we
430 * may use ptrace attach to the process and find out that
433 task
= get_proc_task(inode
);
435 allowed
= ptrace_may_attach(task
);
436 put_task_struct(task
);
441 static int proc_setattr(struct dentry
*dentry
, struct iattr
*attr
)
444 struct inode
*inode
= dentry
->d_inode
;
446 if (attr
->ia_valid
& ATTR_MODE
)
449 error
= inode_change_ok(inode
, attr
);
451 error
= security_inode_setattr(dentry
, attr
);
453 error
= inode_setattr(inode
, attr
);
458 static struct inode_operations proc_def_inode_operations
= {
459 .setattr
= proc_setattr
,
462 extern struct seq_operations mounts_op
;
468 static int mounts_open(struct inode
*inode
, struct file
*file
)
470 struct task_struct
*task
= get_proc_task(inode
);
471 struct namespace *namespace = NULL
;
472 struct proc_mounts
*p
;
477 namespace = task
->nsproxy
->namespace;
479 get_namespace(namespace);
481 put_task_struct(task
);
486 p
= kmalloc(sizeof(struct proc_mounts
), GFP_KERNEL
);
488 file
->private_data
= &p
->m
;
489 ret
= seq_open(file
, &mounts_op
);
491 p
->m
.private = namespace;
492 p
->event
= namespace->event
;
497 put_namespace(namespace);
502 static int mounts_release(struct inode
*inode
, struct file
*file
)
504 struct seq_file
*m
= file
->private_data
;
505 struct namespace *namespace = m
->private;
506 put_namespace(namespace);
507 return seq_release(inode
, file
);
510 static unsigned mounts_poll(struct file
*file
, poll_table
*wait
)
512 struct proc_mounts
*p
= file
->private_data
;
513 struct namespace *ns
= p
->m
.private;
516 poll_wait(file
, &ns
->poll
, wait
);
518 spin_lock(&vfsmount_lock
);
519 if (p
->event
!= ns
->event
) {
520 p
->event
= ns
->event
;
523 spin_unlock(&vfsmount_lock
);
528 static struct file_operations proc_mounts_operations
= {
532 .release
= mounts_release
,
536 extern struct seq_operations mountstats_op
;
537 static int mountstats_open(struct inode
*inode
, struct file
*file
)
539 int ret
= seq_open(file
, &mountstats_op
);
542 struct seq_file
*m
= file
->private_data
;
543 struct namespace *namespace = NULL
;
544 struct task_struct
*task
= get_proc_task(inode
);
548 namespace = task
->nsproxy
->namespace;
550 get_namespace(namespace);
552 put_task_struct(task
);
556 m
->private = namespace;
558 seq_release(inode
, file
);
565 static struct file_operations proc_mountstats_operations
= {
566 .open
= mountstats_open
,
569 .release
= mounts_release
,
572 #define PROC_BLOCK_SIZE (3*1024) /* 4K page size but our output routines use some slack for overruns */
574 static ssize_t
proc_info_read(struct file
* file
, char __user
* buf
,
575 size_t count
, loff_t
*ppos
)
577 struct inode
* inode
= file
->f_dentry
->d_inode
;
580 struct task_struct
*task
= get_proc_task(inode
);
586 if (count
> PROC_BLOCK_SIZE
)
587 count
= PROC_BLOCK_SIZE
;
590 if (!(page
= __get_free_page(GFP_KERNEL
)))
593 length
= PROC_I(inode
)->op
.proc_read(task
, (char*)page
);
596 length
= simple_read_from_buffer(buf
, count
, ppos
, (char *)page
, length
);
599 put_task_struct(task
);
604 static struct file_operations proc_info_file_operations
= {
605 .read
= proc_info_read
,
608 static int mem_open(struct inode
* inode
, struct file
* file
)
610 file
->private_data
= (void*)((long)current
->self_exec_id
);
614 static ssize_t
mem_read(struct file
* file
, char __user
* buf
,
615 size_t count
, loff_t
*ppos
)
617 struct task_struct
*task
= get_proc_task(file
->f_dentry
->d_inode
);
619 unsigned long src
= *ppos
;
621 struct mm_struct
*mm
;
626 if (!MAY_PTRACE(task
) || !ptrace_may_attach(task
))
630 page
= (char *)__get_free_page(GFP_USER
);
636 mm
= get_task_mm(task
);
642 if (file
->private_data
!= (void*)((long)current
->self_exec_id
))
648 int this_len
, retval
;
650 this_len
= (count
> PAGE_SIZE
) ? PAGE_SIZE
: count
;
651 retval
= access_process_vm(task
, src
, page
, this_len
, 0);
652 if (!retval
|| !MAY_PTRACE(task
) || !ptrace_may_attach(task
)) {
658 if (copy_to_user(buf
, page
, retval
)) {
673 free_page((unsigned long) page
);
675 put_task_struct(task
);
680 #define mem_write NULL
683 /* This is a security hazard */
684 static ssize_t
mem_write(struct file
* file
, const char * buf
,
685 size_t count
, loff_t
*ppos
)
689 struct task_struct
*task
= get_proc_task(file
->f_dentry
->d_inode
);
690 unsigned long dst
= *ppos
;
696 if (!MAY_PTRACE(task
) || !ptrace_may_attach(task
))
700 page
= (char *)__get_free_page(GFP_USER
);
706 int this_len
, retval
;
708 this_len
= (count
> PAGE_SIZE
) ? PAGE_SIZE
: count
;
709 if (copy_from_user(page
, buf
, this_len
)) {
713 retval
= access_process_vm(task
, dst
, page
, this_len
, 1);
725 free_page((unsigned long) page
);
727 put_task_struct(task
);
733 static loff_t
mem_lseek(struct file
* file
, loff_t offset
, int orig
)
737 file
->f_pos
= offset
;
740 file
->f_pos
+= offset
;
745 force_successful_syscall_return();
749 static struct file_operations proc_mem_operations
= {
756 static ssize_t
oom_adjust_read(struct file
*file
, char __user
*buf
,
757 size_t count
, loff_t
*ppos
)
759 struct task_struct
*task
= get_proc_task(file
->f_dentry
->d_inode
);
760 char buffer
[PROC_NUMBUF
];
763 loff_t __ppos
= *ppos
;
767 oom_adjust
= task
->oomkilladj
;
768 put_task_struct(task
);
770 len
= snprintf(buffer
, sizeof(buffer
), "%i\n", oom_adjust
);
773 if (count
> len
-__ppos
)
775 if (copy_to_user(buf
, buffer
+ __ppos
, count
))
777 *ppos
= __ppos
+ count
;
781 static ssize_t
oom_adjust_write(struct file
*file
, const char __user
*buf
,
782 size_t count
, loff_t
*ppos
)
784 struct task_struct
*task
;
785 char buffer
[PROC_NUMBUF
], *end
;
788 if (!capable(CAP_SYS_RESOURCE
))
790 memset(buffer
, 0, sizeof(buffer
));
791 if (count
> sizeof(buffer
) - 1)
792 count
= sizeof(buffer
) - 1;
793 if (copy_from_user(buffer
, buf
, count
))
795 oom_adjust
= simple_strtol(buffer
, &end
, 0);
796 if ((oom_adjust
< -16 || oom_adjust
> 15) && oom_adjust
!= OOM_DISABLE
)
800 task
= get_proc_task(file
->f_dentry
->d_inode
);
803 task
->oomkilladj
= oom_adjust
;
804 put_task_struct(task
);
805 if (end
- buffer
== 0)
810 static struct file_operations proc_oom_adjust_operations
= {
811 .read
= oom_adjust_read
,
812 .write
= oom_adjust_write
,
815 #ifdef CONFIG_AUDITSYSCALL
817 static ssize_t
proc_loginuid_read(struct file
* file
, char __user
* buf
,
818 size_t count
, loff_t
*ppos
)
820 struct inode
* inode
= file
->f_dentry
->d_inode
;
821 struct task_struct
*task
= get_proc_task(inode
);
823 char tmpbuf
[TMPBUFLEN
];
827 length
= scnprintf(tmpbuf
, TMPBUFLEN
, "%u",
828 audit_get_loginuid(task
->audit_context
));
829 put_task_struct(task
);
830 return simple_read_from_buffer(buf
, count
, ppos
, tmpbuf
, length
);
833 static ssize_t
proc_loginuid_write(struct file
* file
, const char __user
* buf
,
834 size_t count
, loff_t
*ppos
)
836 struct inode
* inode
= file
->f_dentry
->d_inode
;
841 if (!capable(CAP_AUDIT_CONTROL
))
844 if (current
!= pid_task(proc_pid(inode
), PIDTYPE_PID
))
847 if (count
>= PAGE_SIZE
)
848 count
= PAGE_SIZE
- 1;
851 /* No partial writes. */
854 page
= (char*)__get_free_page(GFP_USER
);
858 if (copy_from_user(page
, buf
, count
))
862 loginuid
= simple_strtoul(page
, &tmp
, 10);
868 length
= audit_set_loginuid(current
, loginuid
);
869 if (likely(length
== 0))
873 free_page((unsigned long) page
);
877 static struct file_operations proc_loginuid_operations
= {
878 .read
= proc_loginuid_read
,
879 .write
= proc_loginuid_write
,
883 #ifdef CONFIG_SECCOMP
884 static ssize_t
seccomp_read(struct file
*file
, char __user
*buf
,
885 size_t count
, loff_t
*ppos
)
887 struct task_struct
*tsk
= get_proc_task(file
->f_dentry
->d_inode
);
889 loff_t __ppos
= *ppos
;
894 /* no need to print the trailing zero, so use only len */
895 len
= sprintf(__buf
, "%u\n", tsk
->seccomp
.mode
);
896 put_task_struct(tsk
);
899 if (count
> len
- __ppos
)
900 count
= len
- __ppos
;
901 if (copy_to_user(buf
, __buf
+ __ppos
, count
))
903 *ppos
= __ppos
+ count
;
907 static ssize_t
seccomp_write(struct file
*file
, const char __user
*buf
,
908 size_t count
, loff_t
*ppos
)
910 struct task_struct
*tsk
= get_proc_task(file
->f_dentry
->d_inode
);
911 char __buf
[20], *end
;
912 unsigned int seccomp_mode
;
919 /* can set it only once to be even more secure */
921 if (unlikely(tsk
->seccomp
.mode
))
925 memset(__buf
, 0, sizeof(__buf
));
926 count
= min(count
, sizeof(__buf
) - 1);
927 if (copy_from_user(__buf
, buf
, count
))
930 seccomp_mode
= simple_strtoul(__buf
, &end
, 0);
934 if (seccomp_mode
&& seccomp_mode
<= NR_SECCOMP_MODES
) {
935 tsk
->seccomp
.mode
= seccomp_mode
;
936 set_tsk_thread_flag(tsk
, TIF_SECCOMP
);
940 if (unlikely(!(end
- __buf
)))
942 result
= end
- __buf
;
944 put_task_struct(tsk
);
949 static struct file_operations proc_seccomp_operations
= {
950 .read
= seccomp_read
,
951 .write
= seccomp_write
,
953 #endif /* CONFIG_SECCOMP */
955 static void *proc_pid_follow_link(struct dentry
*dentry
, struct nameidata
*nd
)
957 struct inode
*inode
= dentry
->d_inode
;
960 /* We don't need a base pointer in the /proc filesystem */
963 /* Are we allowed to snoop on the tasks file descriptors? */
964 if (!proc_fd_access_allowed(inode
))
967 error
= PROC_I(inode
)->op
.proc_get_link(inode
, &nd
->dentry
, &nd
->mnt
);
968 nd
->last_type
= LAST_BIND
;
970 return ERR_PTR(error
);
973 static int do_proc_readlink(struct dentry
*dentry
, struct vfsmount
*mnt
,
974 char __user
*buffer
, int buflen
)
976 struct inode
* inode
;
977 char *tmp
= (char*)__get_free_page(GFP_KERNEL
), *path
;
983 inode
= dentry
->d_inode
;
984 path
= d_path(dentry
, mnt
, tmp
, PAGE_SIZE
);
988 len
= tmp
+ PAGE_SIZE
- 1 - path
;
992 if (copy_to_user(buffer
, path
, len
))
995 free_page((unsigned long)tmp
);
999 static int proc_pid_readlink(struct dentry
* dentry
, char __user
* buffer
, int buflen
)
1001 int error
= -EACCES
;
1002 struct inode
*inode
= dentry
->d_inode
;
1004 struct vfsmount
*mnt
= NULL
;
1006 /* Are we allowed to snoop on the tasks file descriptors? */
1007 if (!proc_fd_access_allowed(inode
))
1010 error
= PROC_I(inode
)->op
.proc_get_link(inode
, &de
, &mnt
);
1014 error
= do_proc_readlink(de
, mnt
, buffer
, buflen
);
1021 static struct inode_operations proc_pid_link_inode_operations
= {
1022 .readlink
= proc_pid_readlink
,
1023 .follow_link
= proc_pid_follow_link
,
1024 .setattr
= proc_setattr
,
1028 /* building an inode */
1030 static int task_dumpable(struct task_struct
*task
)
1033 struct mm_struct
*mm
;
1038 dumpable
= mm
->dumpable
;
1046 static struct inode
*proc_pid_make_inode(struct super_block
* sb
, struct task_struct
*task
, int ino
)
1048 struct inode
* inode
;
1049 struct proc_inode
*ei
;
1051 /* We need a new inode */
1053 inode
= new_inode(sb
);
1059 inode
->i_mtime
= inode
->i_atime
= inode
->i_ctime
= CURRENT_TIME
;
1060 inode
->i_ino
= fake_ino(task
->pid
, ino
);
1061 inode
->i_op
= &proc_def_inode_operations
;
1064 * grab the reference to task.
1066 ei
->pid
= get_pid(task
->pids
[PIDTYPE_PID
].pid
);
1072 if (task_dumpable(task
)) {
1073 inode
->i_uid
= task
->euid
;
1074 inode
->i_gid
= task
->egid
;
1076 security_task_to_inode(task
, inode
);
1086 static int pid_getattr(struct vfsmount
*mnt
, struct dentry
*dentry
, struct kstat
*stat
)
1088 struct inode
*inode
= dentry
->d_inode
;
1089 struct task_struct
*task
;
1090 generic_fillattr(inode
, stat
);
1095 task
= pid_task(proc_pid(inode
), PIDTYPE_PID
);
1097 if ((inode
->i_mode
== (S_IFDIR
|S_IRUGO
|S_IXUGO
)) ||
1098 task_dumpable(task
)) {
1099 stat
->uid
= task
->euid
;
1100 stat
->gid
= task
->egid
;
1110 * Exceptional case: normally we are not allowed to unhash a busy
1111 * directory. In this case, however, we can do it - no aliasing problems
1112 * due to the way we treat inodes.
1114 * Rewrite the inode's ownerships here because the owning task may have
1115 * performed a setuid(), etc.
1117 * Before the /proc/pid/status file was created the only way to read
1118 * the effective uid of a /process was to stat /proc/pid. Reading
1119 * /proc/pid/status is slow enough that procps and other packages
1120 * kept stating /proc/pid. To keep the rules in /proc simple I have
1121 * made this apply to all per process world readable and executable
1124 static int pid_revalidate(struct dentry
*dentry
, struct nameidata
*nd
)
1126 struct inode
*inode
= dentry
->d_inode
;
1127 struct task_struct
*task
= get_proc_task(inode
);
1129 if ((inode
->i_mode
== (S_IFDIR
|S_IRUGO
|S_IXUGO
)) ||
1130 task_dumpable(task
)) {
1131 inode
->i_uid
= task
->euid
;
1132 inode
->i_gid
= task
->egid
;
1137 inode
->i_mode
&= ~(S_ISUID
| S_ISGID
);
1138 security_task_to_inode(task
, inode
);
1139 put_task_struct(task
);
1146 static int pid_delete_dentry(struct dentry
* dentry
)
1148 /* Is the task we represent dead?
1149 * If so, then don't put the dentry on the lru list,
1150 * kill it immediately.
1152 return !proc_pid(dentry
->d_inode
)->tasks
[PIDTYPE_PID
].first
;
1155 static struct dentry_operations pid_dentry_operations
=
1157 .d_revalidate
= pid_revalidate
,
1158 .d_delete
= pid_delete_dentry
,
1163 static unsigned name_to_int(struct dentry
*dentry
)
1165 const char *name
= dentry
->d_name
.name
;
1166 int len
= dentry
->d_name
.len
;
1169 if (len
> 1 && *name
== '0')
1172 unsigned c
= *name
++ - '0';
1175 if (n
>= (~0U-9)/10)
1185 static int proc_fd_link(struct inode
*inode
, struct dentry
**dentry
, struct vfsmount
**mnt
)
1187 struct task_struct
*task
= get_proc_task(inode
);
1188 struct files_struct
*files
= NULL
;
1190 int fd
= proc_fd(inode
);
1193 files
= get_files_struct(task
);
1194 put_task_struct(task
);
1198 * We are not taking a ref to the file structure, so we must
1201 spin_lock(&files
->file_lock
);
1202 file
= fcheck_files(files
, fd
);
1204 *mnt
= mntget(file
->f_vfsmnt
);
1205 *dentry
= dget(file
->f_dentry
);
1206 spin_unlock(&files
->file_lock
);
1207 put_files_struct(files
);
1210 spin_unlock(&files
->file_lock
);
1211 put_files_struct(files
);
1216 static int tid_fd_revalidate(struct dentry
*dentry
, struct nameidata
*nd
)
1218 struct inode
*inode
= dentry
->d_inode
;
1219 struct task_struct
*task
= get_proc_task(inode
);
1220 int fd
= proc_fd(inode
);
1221 struct files_struct
*files
;
1224 files
= get_files_struct(task
);
1227 if (fcheck_files(files
, fd
)) {
1229 put_files_struct(files
);
1230 if (task_dumpable(task
)) {
1231 inode
->i_uid
= task
->euid
;
1232 inode
->i_gid
= task
->egid
;
1237 inode
->i_mode
&= ~(S_ISUID
| S_ISGID
);
1238 security_task_to_inode(task
, inode
);
1239 put_task_struct(task
);
1243 put_files_struct(files
);
1245 put_task_struct(task
);
1251 static struct dentry_operations tid_fd_dentry_operations
=
1253 .d_revalidate
= tid_fd_revalidate
,
1254 .d_delete
= pid_delete_dentry
,
1258 static struct dentry
*proc_lookupfd(struct inode
* dir
, struct dentry
* dentry
, struct nameidata
*nd
)
1260 struct task_struct
*task
= get_proc_task(dir
);
1261 unsigned fd
= name_to_int(dentry
);
1262 struct dentry
*result
= ERR_PTR(-ENOENT
);
1264 struct files_struct
* files
;
1265 struct inode
*inode
;
1266 struct proc_inode
*ei
;
1273 inode
= proc_pid_make_inode(dir
->i_sb
, task
, PROC_TID_FD_DIR
+fd
);
1278 files
= get_files_struct(task
);
1281 inode
->i_mode
= S_IFLNK
;
1284 * We are not taking a ref to the file structure, so we must
1287 spin_lock(&files
->file_lock
);
1288 file
= fcheck_files(files
, fd
);
1291 if (file
->f_mode
& 1)
1292 inode
->i_mode
|= S_IRUSR
| S_IXUSR
;
1293 if (file
->f_mode
& 2)
1294 inode
->i_mode
|= S_IWUSR
| S_IXUSR
;
1295 spin_unlock(&files
->file_lock
);
1296 put_files_struct(files
);
1297 inode
->i_op
= &proc_pid_link_inode_operations
;
1299 ei
->op
.proc_get_link
= proc_fd_link
;
1300 dentry
->d_op
= &tid_fd_dentry_operations
;
1301 d_add(dentry
, inode
);
1302 /* Close the race of the process dying before we return the dentry */
1303 if (tid_fd_revalidate(dentry
, NULL
))
1306 put_task_struct(task
);
1311 spin_unlock(&files
->file_lock
);
1312 put_files_struct(files
);
1318 static int proc_readfd(struct file
* filp
, void * dirent
, filldir_t filldir
)
1320 struct dentry
*dentry
= filp
->f_dentry
;
1321 struct inode
*inode
= dentry
->d_inode
;
1322 struct task_struct
*p
= get_proc_task(inode
);
1323 unsigned int fd
, tid
, ino
;
1325 char buf
[PROC_NUMBUF
];
1326 struct files_struct
* files
;
1327 struct fdtable
*fdt
;
1338 if (filldir(dirent
, ".", 1, 0, inode
->i_ino
, DT_DIR
) < 0)
1342 ino
= parent_ino(dentry
);
1343 if (filldir(dirent
, "..", 2, 1, ino
, DT_DIR
) < 0)
1347 files
= get_files_struct(p
);
1351 fdt
= files_fdtable(files
);
1352 for (fd
= filp
->f_pos
-2;
1354 fd
++, filp
->f_pos
++) {
1357 if (!fcheck_files(files
, fd
))
1365 buf
[j
] = '0' + (i
% 10);
1369 ino
= fake_ino(tid
, PROC_TID_FD_DIR
+ fd
);
1370 if (filldir(dirent
, buf
+j
, PROC_NUMBUF
-j
, fd
+2, ino
, DT_LNK
) < 0) {
1377 put_files_struct(files
);
1385 static struct file_operations proc_fd_operations
= {
1386 .read
= generic_read_dir
,
1387 .readdir
= proc_readfd
,
1391 * proc directories can do almost nothing..
1393 static struct inode_operations proc_fd_inode_operations
= {
1394 .lookup
= proc_lookupfd
,
1395 .setattr
= proc_setattr
,
1399 static struct dentry
*proc_pident_lookup(struct inode
*dir
,
1400 struct dentry
*dentry
,
1401 struct pid_entry
*ents
)
1403 struct inode
*inode
;
1404 struct dentry
*error
;
1405 struct task_struct
*task
= get_proc_task(dir
);
1406 struct pid_entry
*p
;
1407 struct proc_inode
*ei
;
1409 error
= ERR_PTR(-ENOENT
);
1416 * Yes, it does not scale. And it should not. Don't add
1417 * new entries into /proc/<tgid>/ without very good reasons.
1419 for (p
= ents
; p
->name
; p
++) {
1420 if (p
->len
!= dentry
->d_name
.len
)
1422 if (!memcmp(dentry
->d_name
.name
, p
->name
, p
->len
))
1428 error
= ERR_PTR(-EINVAL
);
1429 inode
= proc_pid_make_inode(dir
->i_sb
, task
, p
->type
);
1434 inode
->i_mode
= p
->mode
;
1435 if (S_ISDIR(inode
->i_mode
))
1436 inode
->i_nlink
= 2; /* Use getattr to fix if necessary */
1438 inode
->i_op
= p
->iop
;
1440 inode
->i_fop
= p
->fop
;
1442 dentry
->d_op
= &pid_dentry_operations
;
1443 d_add(dentry
, inode
);
1444 /* Close the race of the process dying before we return the dentry */
1445 if (pid_revalidate(dentry
, NULL
))
1448 put_task_struct(task
);
1453 static int proc_pident_readdir(struct file
*filp
,
1454 void *dirent
, filldir_t filldir
,
1455 struct pid_entry
*ents
, unsigned int nents
)
1459 struct dentry
*dentry
= filp
->f_dentry
;
1460 struct inode
*inode
= dentry
->d_inode
;
1461 struct task_struct
*task
= get_proc_task(inode
);
1462 struct pid_entry
*p
;
1472 put_task_struct(task
);
1477 if (filldir(dirent
, ".", 1, i
, ino
, DT_DIR
) < 0)
1483 ino
= parent_ino(dentry
);
1484 if (filldir(dirent
, "..", 2, i
, ino
, DT_DIR
) < 0)
1497 if (filldir(dirent
, p
->name
, p
->len
, filp
->f_pos
,
1498 fake_ino(pid
, p
->type
), p
->mode
>> 12) < 0)
1510 #ifdef CONFIG_SECURITY
1511 static ssize_t
proc_pid_attr_read(struct file
* file
, char __user
* buf
,
1512 size_t count
, loff_t
*ppos
)
1514 struct inode
* inode
= file
->f_dentry
->d_inode
;
1517 struct task_struct
*task
= get_proc_task(inode
);
1523 if (count
> PAGE_SIZE
)
1526 if (!(page
= __get_free_page(GFP_KERNEL
)))
1529 length
= security_getprocattr(task
,
1530 (char*)file
->f_dentry
->d_name
.name
,
1531 (void*)page
, count
);
1533 length
= simple_read_from_buffer(buf
, count
, ppos
, (char *)page
, length
);
1536 put_task_struct(task
);
1541 static ssize_t
proc_pid_attr_write(struct file
* file
, const char __user
* buf
,
1542 size_t count
, loff_t
*ppos
)
1544 struct inode
* inode
= file
->f_dentry
->d_inode
;
1547 struct task_struct
*task
= get_proc_task(inode
);
1552 if (count
> PAGE_SIZE
)
1555 /* No partial writes. */
1561 page
= (char*)__get_free_page(GFP_USER
);
1566 if (copy_from_user(page
, buf
, count
))
1569 length
= security_setprocattr(task
,
1570 (char*)file
->f_dentry
->d_name
.name
,
1571 (void*)page
, count
);
1573 free_page((unsigned long) page
);
1575 put_task_struct(task
);
1580 static struct file_operations proc_pid_attr_operations
= {
1581 .read
= proc_pid_attr_read
,
1582 .write
= proc_pid_attr_write
,
1585 static struct pid_entry tgid_attr_stuff
[] = {
1586 REG(PROC_TGID_ATTR_CURRENT
, "current", S_IRUGO
|S_IWUGO
, pid_attr
),
1587 REG(PROC_TGID_ATTR_PREV
, "prev", S_IRUGO
, pid_attr
),
1588 REG(PROC_TGID_ATTR_EXEC
, "exec", S_IRUGO
|S_IWUGO
, pid_attr
),
1589 REG(PROC_TGID_ATTR_FSCREATE
, "fscreate", S_IRUGO
|S_IWUGO
, pid_attr
),
1590 REG(PROC_TGID_ATTR_KEYCREATE
, "keycreate", S_IRUGO
|S_IWUGO
, pid_attr
),
1591 REG(PROC_TGID_ATTR_SOCKCREATE
, "sockcreate", S_IRUGO
|S_IWUGO
, pid_attr
),
1594 static struct pid_entry tid_attr_stuff
[] = {
1595 REG(PROC_TID_ATTR_CURRENT
, "current", S_IRUGO
|S_IWUGO
, pid_attr
),
1596 REG(PROC_TID_ATTR_PREV
, "prev", S_IRUGO
, pid_attr
),
1597 REG(PROC_TID_ATTR_EXEC
, "exec", S_IRUGO
|S_IWUGO
, pid_attr
),
1598 REG(PROC_TID_ATTR_FSCREATE
, "fscreate", S_IRUGO
|S_IWUGO
, pid_attr
),
1599 REG(PROC_TID_ATTR_KEYCREATE
, "keycreate", S_IRUGO
|S_IWUGO
, pid_attr
),
1600 REG(PROC_TID_ATTR_SOCKCREATE
, "sockcreate", S_IRUGO
|S_IWUGO
, pid_attr
),
1604 static int proc_tgid_attr_readdir(struct file
* filp
,
1605 void * dirent
, filldir_t filldir
)
1607 return proc_pident_readdir(filp
,dirent
,filldir
,
1608 tgid_attr_stuff
,ARRAY_SIZE(tgid_attr_stuff
));
1611 static int proc_tid_attr_readdir(struct file
* filp
,
1612 void * dirent
, filldir_t filldir
)
1614 return proc_pident_readdir(filp
,dirent
,filldir
,
1615 tid_attr_stuff
,ARRAY_SIZE(tid_attr_stuff
));
1618 static struct file_operations proc_tgid_attr_operations
= {
1619 .read
= generic_read_dir
,
1620 .readdir
= proc_tgid_attr_readdir
,
1623 static struct file_operations proc_tid_attr_operations
= {
1624 .read
= generic_read_dir
,
1625 .readdir
= proc_tid_attr_readdir
,
1628 static struct dentry
*proc_tgid_attr_lookup(struct inode
*dir
,
1629 struct dentry
*dentry
, struct nameidata
*nd
)
1631 return proc_pident_lookup(dir
, dentry
, tgid_attr_stuff
);
1634 static struct dentry
*proc_tid_attr_lookup(struct inode
*dir
,
1635 struct dentry
*dentry
, struct nameidata
*nd
)
1637 return proc_pident_lookup(dir
, dentry
, tid_attr_stuff
);
1640 static struct inode_operations proc_tgid_attr_inode_operations
= {
1641 .lookup
= proc_tgid_attr_lookup
,
1642 .getattr
= pid_getattr
,
1643 .setattr
= proc_setattr
,
1646 static struct inode_operations proc_tid_attr_inode_operations
= {
1647 .lookup
= proc_tid_attr_lookup
,
1648 .getattr
= pid_getattr
,
1649 .setattr
= proc_setattr
,
1656 static int proc_self_readlink(struct dentry
*dentry
, char __user
*buffer
,
1659 char tmp
[PROC_NUMBUF
];
1660 sprintf(tmp
, "%d", current
->tgid
);
1661 return vfs_readlink(dentry
,buffer
,buflen
,tmp
);
1664 static void *proc_self_follow_link(struct dentry
*dentry
, struct nameidata
*nd
)
1666 char tmp
[PROC_NUMBUF
];
1667 sprintf(tmp
, "%d", current
->tgid
);
1668 return ERR_PTR(vfs_follow_link(nd
,tmp
));
1671 static struct inode_operations proc_self_inode_operations
= {
1672 .readlink
= proc_self_readlink
,
1673 .follow_link
= proc_self_follow_link
,
1679 static struct file_operations proc_task_operations
;
1680 static struct inode_operations proc_task_inode_operations
;
1682 static struct pid_entry tgid_base_stuff
[] = {
1683 DIR(PROC_TGID_TASK
, "task", S_IRUGO
|S_IXUGO
, task
),
1684 DIR(PROC_TGID_FD
, "fd", S_IRUSR
|S_IXUSR
, fd
),
1685 INF(PROC_TGID_ENVIRON
, "environ", S_IRUSR
, pid_environ
),
1686 INF(PROC_TGID_AUXV
, "auxv", S_IRUSR
, pid_auxv
),
1687 INF(PROC_TGID_STATUS
, "status", S_IRUGO
, pid_status
),
1688 INF(PROC_TGID_CMDLINE
, "cmdline", S_IRUGO
, pid_cmdline
),
1689 INF(PROC_TGID_STAT
, "stat", S_IRUGO
, tgid_stat
),
1690 INF(PROC_TGID_STATM
, "statm", S_IRUGO
, pid_statm
),
1691 REG(PROC_TGID_MAPS
, "maps", S_IRUGO
, maps
),
1693 REG(PROC_TGID_NUMA_MAPS
, "numa_maps", S_IRUGO
, numa_maps
),
1695 REG(PROC_TGID_MEM
, "mem", S_IRUSR
|S_IWUSR
, mem
),
1696 #ifdef CONFIG_SECCOMP
1697 REG(PROC_TGID_SECCOMP
, "seccomp", S_IRUSR
|S_IWUSR
, seccomp
),
1699 LNK(PROC_TGID_CWD
, "cwd", cwd
),
1700 LNK(PROC_TGID_ROOT
, "root", root
),
1701 LNK(PROC_TGID_EXE
, "exe", exe
),
1702 REG(PROC_TGID_MOUNTS
, "mounts", S_IRUGO
, mounts
),
1703 REG(PROC_TGID_MOUNTSTATS
, "mountstats", S_IRUSR
, mountstats
),
1705 REG(PROC_TGID_SMAPS
, "smaps", S_IRUGO
, smaps
),
1707 #ifdef CONFIG_SECURITY
1708 DIR(PROC_TGID_ATTR
, "attr", S_IRUGO
|S_IXUGO
, tgid_attr
),
1710 #ifdef CONFIG_KALLSYMS
1711 INF(PROC_TGID_WCHAN
, "wchan", S_IRUGO
, pid_wchan
),
1713 #ifdef CONFIG_SCHEDSTATS
1714 INF(PROC_TGID_SCHEDSTAT
, "schedstat", S_IRUGO
, pid_schedstat
),
1716 #ifdef CONFIG_CPUSETS
1717 REG(PROC_TGID_CPUSET
, "cpuset", S_IRUGO
, cpuset
),
1719 INF(PROC_TGID_OOM_SCORE
, "oom_score", S_IRUGO
, oom_score
),
1720 REG(PROC_TGID_OOM_ADJUST
, "oom_adj", S_IRUGO
|S_IWUSR
, oom_adjust
),
1721 #ifdef CONFIG_AUDITSYSCALL
1722 REG(PROC_TGID_LOGINUID
, "loginuid", S_IWUSR
|S_IRUGO
, loginuid
),
1727 static int proc_tgid_base_readdir(struct file
* filp
,
1728 void * dirent
, filldir_t filldir
)
1730 return proc_pident_readdir(filp
,dirent
,filldir
,
1731 tgid_base_stuff
,ARRAY_SIZE(tgid_base_stuff
));
1734 static struct file_operations proc_tgid_base_operations
= {
1735 .read
= generic_read_dir
,
1736 .readdir
= proc_tgid_base_readdir
,
1739 static struct dentry
*proc_tgid_base_lookup(struct inode
*dir
, struct dentry
*dentry
, struct nameidata
*nd
){
1740 return proc_pident_lookup(dir
, dentry
, tgid_base_stuff
);
1743 static struct inode_operations proc_tgid_base_inode_operations
= {
1744 .lookup
= proc_tgid_base_lookup
,
1745 .getattr
= pid_getattr
,
1746 .setattr
= proc_setattr
,
1750 * proc_flush_task - Remove dcache entries for @task from the /proc dcache.
1752 * @task: task that should be flushed.
1754 * Looks in the dcache for
1756 * /proc/@tgid/task/@pid
1757 * if either directory is present flushes it and all of it'ts children
1760 * It is safe and reasonable to cache /proc entries for a task until
1761 * that task exits. After that they just clog up the dcache with
1762 * useless entries, possibly causing useful dcache entries to be
1763 * flushed instead. This routine is proved to flush those useless
1764 * dcache entries at process exit time.
1766 * NOTE: This routine is just an optimization so it does not guarantee
1767 * that no dcache entries will exist at process exit time it
1768 * just makes it very unlikely that any will persist.
1770 void proc_flush_task(struct task_struct
*task
)
1772 struct dentry
*dentry
, *leader
, *dir
;
1773 char buf
[PROC_NUMBUF
];
1777 name
.len
= snprintf(buf
, sizeof(buf
), "%d", task
->pid
);
1778 dentry
= d_hash_and_lookup(proc_mnt
->mnt_root
, &name
);
1780 shrink_dcache_parent(dentry
);
1785 if (thread_group_leader(task
))
1789 name
.len
= snprintf(buf
, sizeof(buf
), "%d", task
->tgid
);
1790 leader
= d_hash_and_lookup(proc_mnt
->mnt_root
, &name
);
1795 name
.len
= strlen(name
.name
);
1796 dir
= d_hash_and_lookup(leader
, &name
);
1798 goto out_put_leader
;
1801 name
.len
= snprintf(buf
, sizeof(buf
), "%d", task
->pid
);
1802 dentry
= d_hash_and_lookup(dir
, &name
);
1804 shrink_dcache_parent(dentry
);
1817 struct dentry
*proc_pid_lookup(struct inode
*dir
, struct dentry
* dentry
, struct nameidata
*nd
)
1819 struct dentry
*result
= ERR_PTR(-ENOENT
);
1820 struct task_struct
*task
;
1821 struct inode
*inode
;
1822 struct proc_inode
*ei
;
1825 if (dentry
->d_name
.len
== 4 && !memcmp(dentry
->d_name
.name
,"self",4)) {
1826 inode
= new_inode(dir
->i_sb
);
1828 return ERR_PTR(-ENOMEM
);
1830 inode
->i_mtime
= inode
->i_atime
= inode
->i_ctime
= CURRENT_TIME
;
1831 inode
->i_ino
= fake_ino(0, PROC_TGID_INO
);
1833 inode
->i_mode
= S_IFLNK
|S_IRWXUGO
;
1834 inode
->i_uid
= inode
->i_gid
= 0;
1836 inode
->i_op
= &proc_self_inode_operations
;
1837 d_add(dentry
, inode
);
1840 tgid
= name_to_int(dentry
);
1845 task
= find_task_by_pid(tgid
);
1847 get_task_struct(task
);
1852 inode
= proc_pid_make_inode(dir
->i_sb
, task
, PROC_TGID_INO
);
1856 inode
->i_mode
= S_IFDIR
|S_IRUGO
|S_IXUGO
;
1857 inode
->i_op
= &proc_tgid_base_inode_operations
;
1858 inode
->i_fop
= &proc_tgid_base_operations
;
1859 inode
->i_flags
|=S_IMMUTABLE
;
1860 #ifdef CONFIG_SECURITY
1866 dentry
->d_op
= &pid_dentry_operations
;
1868 d_add(dentry
, inode
);
1869 /* Close the race of the process dying before we return the dentry */
1870 if (pid_revalidate(dentry
, NULL
))
1874 put_task_struct(task
);
1880 * Find the first task with tgid >= tgid
1883 static struct task_struct
*next_tgid(unsigned int tgid
)
1885 struct task_struct
*task
;
1891 pid
= find_ge_pid(tgid
);
1894 task
= pid_task(pid
, PIDTYPE_PID
);
1895 /* What we to know is if the pid we have find is the
1896 * pid of a thread_group_leader. Testing for task
1897 * being a thread_group_leader is the obvious thing
1898 * todo but there is a window when it fails, due to
1899 * the pid transfer logic in de_thread.
1901 * So we perform the straight forward test of seeing
1902 * if the pid we have found is the pid of a thread
1903 * group leader, and don't worry if the task we have
1904 * found doesn't happen to be a thread group leader.
1905 * As we don't care in the case of readdir.
1907 if (!task
|| !has_group_leader_pid(task
))
1909 get_task_struct(task
);
1915 #define TGID_OFFSET (FIRST_PROCESS_ENTRY + (1 /* /proc/self */))
1917 /* for the /proc/ directory itself, after non-process stuff has been done */
1918 int proc_pid_readdir(struct file
* filp
, void * dirent
, filldir_t filldir
)
1920 char buf
[PROC_NUMBUF
];
1921 unsigned int nr
= filp
->f_pos
- FIRST_PROCESS_ENTRY
;
1922 struct task_struct
*task
;
1926 ino_t ino
= fake_ino(0,PROC_TGID_INO
);
1927 if (filldir(dirent
, "self", 4, filp
->f_pos
, ino
, DT_LNK
) < 0)
1933 tgid
= filp
->f_pos
- TGID_OFFSET
;
1934 for (task
= next_tgid(tgid
);
1936 put_task_struct(task
), task
= next_tgid(tgid
+ 1)) {
1940 filp
->f_pos
= tgid
+ TGID_OFFSET
;
1941 len
= snprintf(buf
, sizeof(buf
), "%d", tgid
);
1942 ino
= fake_ino(tgid
, PROC_TGID_INO
);
1943 if (filldir(dirent
, buf
, len
, filp
->f_pos
, ino
, DT_DIR
) < 0) {
1944 put_task_struct(task
);
1948 filp
->f_pos
= PID_MAX_LIMIT
+ TGID_OFFSET
;
1956 static struct pid_entry tid_base_stuff
[] = {
1957 DIR(PROC_TID_FD
, "fd", S_IRUSR
|S_IXUSR
, fd
),
1958 INF(PROC_TID_ENVIRON
, "environ", S_IRUSR
, pid_environ
),
1959 INF(PROC_TID_AUXV
, "auxv", S_IRUSR
, pid_auxv
),
1960 INF(PROC_TID_STATUS
, "status", S_IRUGO
, pid_status
),
1961 INF(PROC_TID_CMDLINE
, "cmdline", S_IRUGO
, pid_cmdline
),
1962 INF(PROC_TID_STAT
, "stat", S_IRUGO
, tid_stat
),
1963 INF(PROC_TID_STATM
, "statm", S_IRUGO
, pid_statm
),
1964 REG(PROC_TID_MAPS
, "maps", S_IRUGO
, maps
),
1966 REG(PROC_TID_NUMA_MAPS
, "numa_maps", S_IRUGO
, numa_maps
),
1968 REG(PROC_TID_MEM
, "mem", S_IRUSR
|S_IWUSR
, mem
),
1969 #ifdef CONFIG_SECCOMP
1970 REG(PROC_TID_SECCOMP
, "seccomp", S_IRUSR
|S_IWUSR
, seccomp
),
1972 LNK(PROC_TID_CWD
, "cwd", cwd
),
1973 LNK(PROC_TID_ROOT
, "root", root
),
1974 LNK(PROC_TID_EXE
, "exe", exe
),
1975 REG(PROC_TID_MOUNTS
, "mounts", S_IRUGO
, mounts
),
1977 REG(PROC_TID_SMAPS
, "smaps", S_IRUGO
, smaps
),
1979 #ifdef CONFIG_SECURITY
1980 DIR(PROC_TID_ATTR
, "attr", S_IRUGO
|S_IXUGO
, tid_attr
),
1982 #ifdef CONFIG_KALLSYMS
1983 INF(PROC_TID_WCHAN
, "wchan", S_IRUGO
, pid_wchan
),
1985 #ifdef CONFIG_SCHEDSTATS
1986 INF(PROC_TID_SCHEDSTAT
, "schedstat", S_IRUGO
, pid_schedstat
),
1988 #ifdef CONFIG_CPUSETS
1989 REG(PROC_TID_CPUSET
, "cpuset", S_IRUGO
, cpuset
),
1991 INF(PROC_TID_OOM_SCORE
, "oom_score", S_IRUGO
, oom_score
),
1992 REG(PROC_TID_OOM_ADJUST
, "oom_adj", S_IRUGO
|S_IWUSR
, oom_adjust
),
1993 #ifdef CONFIG_AUDITSYSCALL
1994 REG(PROC_TID_LOGINUID
, "loginuid", S_IWUSR
|S_IRUGO
, loginuid
),
1999 static int proc_tid_base_readdir(struct file
* filp
,
2000 void * dirent
, filldir_t filldir
)
2002 return proc_pident_readdir(filp
,dirent
,filldir
,
2003 tid_base_stuff
,ARRAY_SIZE(tid_base_stuff
));
2006 static struct dentry
*proc_tid_base_lookup(struct inode
*dir
, struct dentry
*dentry
, struct nameidata
*nd
){
2007 return proc_pident_lookup(dir
, dentry
, tid_base_stuff
);
2010 static struct file_operations proc_tid_base_operations
= {
2011 .read
= generic_read_dir
,
2012 .readdir
= proc_tid_base_readdir
,
2015 static struct inode_operations proc_tid_base_inode_operations
= {
2016 .lookup
= proc_tid_base_lookup
,
2017 .getattr
= pid_getattr
,
2018 .setattr
= proc_setattr
,
2022 static struct dentry
*proc_task_lookup(struct inode
*dir
, struct dentry
* dentry
, struct nameidata
*nd
)
2024 struct dentry
*result
= ERR_PTR(-ENOENT
);
2025 struct task_struct
*task
;
2026 struct task_struct
*leader
= get_proc_task(dir
);
2027 struct inode
*inode
;
2033 tid
= name_to_int(dentry
);
2038 task
= find_task_by_pid(tid
);
2040 get_task_struct(task
);
2044 if (leader
->tgid
!= task
->tgid
)
2047 inode
= proc_pid_make_inode(dir
->i_sb
, task
, PROC_TID_INO
);
2052 inode
->i_mode
= S_IFDIR
|S_IRUGO
|S_IXUGO
;
2053 inode
->i_op
= &proc_tid_base_inode_operations
;
2054 inode
->i_fop
= &proc_tid_base_operations
;
2055 inode
->i_flags
|=S_IMMUTABLE
;
2056 #ifdef CONFIG_SECURITY
2062 dentry
->d_op
= &pid_dentry_operations
;
2064 d_add(dentry
, inode
);
2065 /* Close the race of the process dying before we return the dentry */
2066 if (pid_revalidate(dentry
, NULL
))
2070 put_task_struct(task
);
2072 put_task_struct(leader
);
2078 * Find the first tid of a thread group to return to user space.
2080 * Usually this is just the thread group leader, but if the users
2081 * buffer was too small or there was a seek into the middle of the
2082 * directory we have more work todo.
2084 * In the case of a short read we start with find_task_by_pid.
2086 * In the case of a seek we start with the leader and walk nr
2089 static struct task_struct
*first_tid(struct task_struct
*leader
,
2092 struct task_struct
*pos
;
2095 /* Attempt to start with the pid of a thread */
2096 if (tid
&& (nr
> 0)) {
2097 pos
= find_task_by_pid(tid
);
2098 if (pos
&& (pos
->group_leader
== leader
))
2102 /* If nr exceeds the number of threads there is nothing todo */
2104 if (nr
&& nr
>= get_nr_threads(leader
))
2107 /* If we haven't found our starting place yet start
2108 * with the leader and walk nr threads forward.
2110 for (pos
= leader
; nr
> 0; --nr
) {
2111 pos
= next_thread(pos
);
2112 if (pos
== leader
) {
2118 get_task_struct(pos
);
2125 * Find the next thread in the thread list.
2126 * Return NULL if there is an error or no next thread.
2128 * The reference to the input task_struct is released.
2130 static struct task_struct
*next_tid(struct task_struct
*start
)
2132 struct task_struct
*pos
= NULL
;
2134 if (pid_alive(start
)) {
2135 pos
= next_thread(start
);
2136 if (thread_group_leader(pos
))
2139 get_task_struct(pos
);
2142 put_task_struct(start
);
2146 /* for the /proc/TGID/task/ directories */
2147 static int proc_task_readdir(struct file
* filp
, void * dirent
, filldir_t filldir
)
2149 char buf
[PROC_NUMBUF
];
2150 struct dentry
*dentry
= filp
->f_dentry
;
2151 struct inode
*inode
= dentry
->d_inode
;
2152 struct task_struct
*leader
= get_proc_task(inode
);
2153 struct task_struct
*task
;
2154 int retval
= -ENOENT
;
2157 unsigned long pos
= filp
->f_pos
; /* avoiding "long long" filp->f_pos */
2166 if (filldir(dirent
, ".", 1, pos
, ino
, DT_DIR
) < 0)
2171 ino
= parent_ino(dentry
);
2172 if (filldir(dirent
, "..", 2, pos
, ino
, DT_DIR
) < 0)
2178 /* f_version caches the tgid value that the last readdir call couldn't
2179 * return. lseek aka telldir automagically resets f_version to 0.
2181 tid
= filp
->f_version
;
2182 filp
->f_version
= 0;
2183 for (task
= first_tid(leader
, tid
, pos
- 2);
2185 task
= next_tid(task
), pos
++) {
2188 len
= snprintf(buf
, sizeof(buf
), "%d", tid
);
2189 ino
= fake_ino(tid
, PROC_TID_INO
);
2190 if (filldir(dirent
, buf
, len
, pos
, ino
, DT_DIR
< 0)) {
2191 /* returning this tgid failed, save it as the first
2192 * pid for the next readir call */
2193 filp
->f_version
= tid
;
2194 put_task_struct(task
);
2200 put_task_struct(leader
);
2205 static int proc_task_getattr(struct vfsmount
*mnt
, struct dentry
*dentry
, struct kstat
*stat
)
2207 struct inode
*inode
= dentry
->d_inode
;
2208 struct task_struct
*p
= get_proc_task(inode
);
2209 generic_fillattr(inode
, stat
);
2213 stat
->nlink
+= get_nr_threads(p
);
2221 static struct inode_operations proc_task_inode_operations
= {
2222 .lookup
= proc_task_lookup
,
2223 .getattr
= proc_task_getattr
,
2224 .setattr
= proc_setattr
,
2227 static struct file_operations proc_task_operations
= {
2228 .read
= generic_read_dir
,
2229 .readdir
= proc_task_readdir
,