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 <linux/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/task_io_accounting_ops.h>
57 #include <linux/init.h>
58 #include <linux/capability.h>
59 #include <linux/file.h>
60 #include <linux/fdtable.h>
61 #include <linux/string.h>
62 #include <linux/seq_file.h>
63 #include <linux/namei.h>
64 #include <linux/mnt_namespace.h>
66 #include <linux/swap.h>
67 #include <linux/rcupdate.h>
68 #include <linux/kallsyms.h>
69 #include <linux/stacktrace.h>
70 #include <linux/resource.h>
71 #include <linux/module.h>
72 #include <linux/mount.h>
73 #include <linux/security.h>
74 #include <linux/ptrace.h>
75 #include <linux/tracehook.h>
76 #include <linux/printk.h>
77 #include <linux/cgroup.h>
78 #include <linux/cpuset.h>
79 #include <linux/audit.h>
80 #include <linux/poll.h>
81 #include <linux/nsproxy.h>
82 #include <linux/oom.h>
83 #include <linux/elf.h>
84 #include <linux/pid_namespace.h>
85 #include <linux/user_namespace.h>
86 #include <linux/fs_struct.h>
87 #include <linux/slab.h>
88 #include <linux/sched/autogroup.h>
89 #include <linux/sched/mm.h>
90 #include <linux/sched/coredump.h>
91 #include <linux/sched/debug.h>
92 #include <linux/sched/stat.h>
93 #include <linux/flex_array.h>
94 #include <linux/posix-timers.h>
95 #ifdef CONFIG_HARDWALL
96 #include <asm/hardwall.h>
98 #include <trace/events/oom.h>
103 * Implementing inode permission operations in /proc is almost
104 * certainly an error. Permission checks need to happen during
105 * each system call not at open time. The reason is that most of
106 * what we wish to check for permissions in /proc varies at runtime.
108 * The classic example of a problem is opening file descriptors
109 * in /proc for a task before it execs a suid executable.
113 static u8 nlink_tgid
;
119 const struct inode_operations
*iop
;
120 const struct file_operations
*fop
;
124 #define NOD(NAME, MODE, IOP, FOP, OP) { \
126 .len = sizeof(NAME) - 1, \
133 #define DIR(NAME, MODE, iops, fops) \
134 NOD(NAME, (S_IFDIR|(MODE)), &iops, &fops, {} )
135 #define LNK(NAME, get_link) \
136 NOD(NAME, (S_IFLNK|S_IRWXUGO), \
137 &proc_pid_link_inode_operations, NULL, \
138 { .proc_get_link = get_link } )
139 #define REG(NAME, MODE, fops) \
140 NOD(NAME, (S_IFREG|(MODE)), NULL, &fops, {})
141 #define ONE(NAME, MODE, show) \
142 NOD(NAME, (S_IFREG|(MODE)), \
143 NULL, &proc_single_file_operations, \
144 { .proc_show = show } )
147 * Count the number of hardlinks for the pid_entry table, excluding the .
150 static unsigned int __init
pid_entry_nlink(const struct pid_entry
*entries
,
157 for (i
= 0; i
< n
; ++i
) {
158 if (S_ISDIR(entries
[i
].mode
))
165 static int get_task_root(struct task_struct
*task
, struct path
*root
)
167 int result
= -ENOENT
;
171 get_fs_root(task
->fs
, root
);
178 static int proc_cwd_link(struct dentry
*dentry
, struct path
*path
)
180 struct task_struct
*task
= get_proc_task(d_inode(dentry
));
181 int result
= -ENOENT
;
186 get_fs_pwd(task
->fs
, path
);
190 put_task_struct(task
);
195 static int proc_root_link(struct dentry
*dentry
, struct path
*path
)
197 struct task_struct
*task
= get_proc_task(d_inode(dentry
));
198 int result
= -ENOENT
;
201 result
= get_task_root(task
, path
);
202 put_task_struct(task
);
207 static ssize_t
proc_pid_cmdline_read(struct file
*file
, char __user
*buf
,
208 size_t _count
, loff_t
*pos
)
210 struct task_struct
*tsk
;
211 struct mm_struct
*mm
;
213 unsigned long count
= _count
;
214 unsigned long arg_start
, arg_end
, env_start
, env_end
;
215 unsigned long len1
, len2
, len
;
222 tsk
= get_proc_task(file_inode(file
));
225 mm
= get_task_mm(tsk
);
226 put_task_struct(tsk
);
229 /* Check if process spawned far enough to have cmdline. */
235 page
= (char *)__get_free_page(GFP_TEMPORARY
);
241 down_read(&mm
->mmap_sem
);
242 arg_start
= mm
->arg_start
;
243 arg_end
= mm
->arg_end
;
244 env_start
= mm
->env_start
;
245 env_end
= mm
->env_end
;
246 up_read(&mm
->mmap_sem
);
248 BUG_ON(arg_start
> arg_end
);
249 BUG_ON(env_start
> env_end
);
251 len1
= arg_end
- arg_start
;
252 len2
= env_end
- env_start
;
260 * Inherently racy -- command line shares address space
261 * with code and data.
263 rv
= access_remote_vm(mm
, arg_end
- 1, &c
, 1, 0);
270 /* Command line (set of strings) occupies whole ARGV. */
274 p
= arg_start
+ *pos
;
276 while (count
> 0 && len
> 0) {
280 _count
= min3(count
, len
, PAGE_SIZE
);
281 nr_read
= access_remote_vm(mm
, p
, page
, _count
, 0);
287 if (copy_to_user(buf
, page
, nr_read
)) {
300 * Command line (1 string) occupies ARGV and
307 { .p
= arg_start
, .len
= len1
},
308 { .p
= env_start
, .len
= len2
},
314 while (i
< 2 && pos1
>= cmdline
[i
].len
) {
315 pos1
-= cmdline
[i
].len
;
319 p
= cmdline
[i
].p
+ pos1
;
320 len
= cmdline
[i
].len
- pos1
;
321 while (count
> 0 && len
> 0) {
322 unsigned int _count
, l
;
326 _count
= min3(count
, len
, PAGE_SIZE
);
327 nr_read
= access_remote_vm(mm
, p
, page
, _count
, 0);
334 * Command line can be shorter than whole ARGV
335 * even if last "marker" byte says it is not.
338 l
= strnlen(page
, nr_read
);
344 if (copy_to_user(buf
, page
, nr_read
)) {
359 /* Only first chunk can be read partially. */
366 free_page((unsigned long)page
);
374 static const struct file_operations proc_pid_cmdline_ops
= {
375 .read
= proc_pid_cmdline_read
,
376 .llseek
= generic_file_llseek
,
379 #ifdef CONFIG_KALLSYMS
381 * Provides a wchan file via kallsyms in a proper one-value-per-file format.
382 * Returns the resolved symbol. If that fails, simply return the address.
384 static int proc_pid_wchan(struct seq_file
*m
, struct pid_namespace
*ns
,
385 struct pid
*pid
, struct task_struct
*task
)
388 char symname
[KSYM_NAME_LEN
];
390 wchan
= get_wchan(task
);
392 if (wchan
&& ptrace_may_access(task
, PTRACE_MODE_READ_FSCREDS
)
393 && !lookup_symbol_name(wchan
, symname
))
394 seq_printf(m
, "%s", symname
);
400 #endif /* CONFIG_KALLSYMS */
402 static int lock_trace(struct task_struct
*task
)
404 int err
= mutex_lock_killable(&task
->signal
->cred_guard_mutex
);
407 if (!ptrace_may_access(task
, PTRACE_MODE_ATTACH_FSCREDS
)) {
408 mutex_unlock(&task
->signal
->cred_guard_mutex
);
414 static void unlock_trace(struct task_struct
*task
)
416 mutex_unlock(&task
->signal
->cred_guard_mutex
);
419 #ifdef CONFIG_STACKTRACE
421 #define MAX_STACK_TRACE_DEPTH 64
423 static int proc_pid_stack(struct seq_file
*m
, struct pid_namespace
*ns
,
424 struct pid
*pid
, struct task_struct
*task
)
426 struct stack_trace trace
;
427 unsigned long *entries
;
431 entries
= kmalloc(MAX_STACK_TRACE_DEPTH
* sizeof(*entries
), GFP_KERNEL
);
435 trace
.nr_entries
= 0;
436 trace
.max_entries
= MAX_STACK_TRACE_DEPTH
;
437 trace
.entries
= entries
;
440 err
= lock_trace(task
);
442 save_stack_trace_tsk(task
, &trace
);
444 for (i
= 0; i
< trace
.nr_entries
; i
++) {
445 seq_printf(m
, "[<%pK>] %pB\n",
446 (void *)entries
[i
], (void *)entries
[i
]);
456 #ifdef CONFIG_SCHED_INFO
458 * Provides /proc/PID/schedstat
460 static int proc_pid_schedstat(struct seq_file
*m
, struct pid_namespace
*ns
,
461 struct pid
*pid
, struct task_struct
*task
)
463 if (unlikely(!sched_info_on()))
464 seq_printf(m
, "0 0 0\n");
466 seq_printf(m
, "%llu %llu %lu\n",
467 (unsigned long long)task
->se
.sum_exec_runtime
,
468 (unsigned long long)task
->sched_info
.run_delay
,
469 task
->sched_info
.pcount
);
475 #ifdef CONFIG_LATENCYTOP
476 static int lstats_show_proc(struct seq_file
*m
, void *v
)
479 struct inode
*inode
= m
->private;
480 struct task_struct
*task
= get_proc_task(inode
);
484 seq_puts(m
, "Latency Top version : v0.1\n");
485 for (i
= 0; i
< 32; i
++) {
486 struct latency_record
*lr
= &task
->latency_record
[i
];
487 if (lr
->backtrace
[0]) {
489 seq_printf(m
, "%i %li %li",
490 lr
->count
, lr
->time
, lr
->max
);
491 for (q
= 0; q
< LT_BACKTRACEDEPTH
; q
++) {
492 unsigned long bt
= lr
->backtrace
[q
];
497 seq_printf(m
, " %ps", (void *)bt
);
503 put_task_struct(task
);
507 static int lstats_open(struct inode
*inode
, struct file
*file
)
509 return single_open(file
, lstats_show_proc
, inode
);
512 static ssize_t
lstats_write(struct file
*file
, const char __user
*buf
,
513 size_t count
, loff_t
*offs
)
515 struct task_struct
*task
= get_proc_task(file_inode(file
));
519 clear_all_latency_tracing(task
);
520 put_task_struct(task
);
525 static const struct file_operations proc_lstats_operations
= {
528 .write
= lstats_write
,
530 .release
= single_release
,
535 static int proc_oom_score(struct seq_file
*m
, struct pid_namespace
*ns
,
536 struct pid
*pid
, struct task_struct
*task
)
538 unsigned long totalpages
= totalram_pages
+ total_swap_pages
;
539 unsigned long points
= 0;
541 points
= oom_badness(task
, NULL
, NULL
, totalpages
) *
543 seq_printf(m
, "%lu\n", points
);
553 static const struct limit_names lnames
[RLIM_NLIMITS
] = {
554 [RLIMIT_CPU
] = {"Max cpu time", "seconds"},
555 [RLIMIT_FSIZE
] = {"Max file size", "bytes"},
556 [RLIMIT_DATA
] = {"Max data size", "bytes"},
557 [RLIMIT_STACK
] = {"Max stack size", "bytes"},
558 [RLIMIT_CORE
] = {"Max core file size", "bytes"},
559 [RLIMIT_RSS
] = {"Max resident set", "bytes"},
560 [RLIMIT_NPROC
] = {"Max processes", "processes"},
561 [RLIMIT_NOFILE
] = {"Max open files", "files"},
562 [RLIMIT_MEMLOCK
] = {"Max locked memory", "bytes"},
563 [RLIMIT_AS
] = {"Max address space", "bytes"},
564 [RLIMIT_LOCKS
] = {"Max file locks", "locks"},
565 [RLIMIT_SIGPENDING
] = {"Max pending signals", "signals"},
566 [RLIMIT_MSGQUEUE
] = {"Max msgqueue size", "bytes"},
567 [RLIMIT_NICE
] = {"Max nice priority", NULL
},
568 [RLIMIT_RTPRIO
] = {"Max realtime priority", NULL
},
569 [RLIMIT_RTTIME
] = {"Max realtime timeout", "us"},
572 /* Display limits for a process */
573 static int proc_pid_limits(struct seq_file
*m
, struct pid_namespace
*ns
,
574 struct pid
*pid
, struct task_struct
*task
)
579 struct rlimit rlim
[RLIM_NLIMITS
];
581 if (!lock_task_sighand(task
, &flags
))
583 memcpy(rlim
, task
->signal
->rlim
, sizeof(struct rlimit
) * RLIM_NLIMITS
);
584 unlock_task_sighand(task
, &flags
);
587 * print the file header
589 seq_printf(m
, "%-25s %-20s %-20s %-10s\n",
590 "Limit", "Soft Limit", "Hard Limit", "Units");
592 for (i
= 0; i
< RLIM_NLIMITS
; i
++) {
593 if (rlim
[i
].rlim_cur
== RLIM_INFINITY
)
594 seq_printf(m
, "%-25s %-20s ",
595 lnames
[i
].name
, "unlimited");
597 seq_printf(m
, "%-25s %-20lu ",
598 lnames
[i
].name
, rlim
[i
].rlim_cur
);
600 if (rlim
[i
].rlim_max
== RLIM_INFINITY
)
601 seq_printf(m
, "%-20s ", "unlimited");
603 seq_printf(m
, "%-20lu ", rlim
[i
].rlim_max
);
606 seq_printf(m
, "%-10s\n", lnames
[i
].unit
);
614 #ifdef CONFIG_HAVE_ARCH_TRACEHOOK
615 static int proc_pid_syscall(struct seq_file
*m
, struct pid_namespace
*ns
,
616 struct pid
*pid
, struct task_struct
*task
)
619 unsigned long args
[6], sp
, pc
;
622 res
= lock_trace(task
);
626 if (task_current_syscall(task
, &nr
, args
, 6, &sp
, &pc
))
627 seq_puts(m
, "running\n");
629 seq_printf(m
, "%ld 0x%lx 0x%lx\n", nr
, sp
, pc
);
632 "%ld 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx\n",
634 args
[0], args
[1], args
[2], args
[3], args
[4], args
[5],
640 #endif /* CONFIG_HAVE_ARCH_TRACEHOOK */
642 /************************************************************************/
643 /* Here the fs part begins */
644 /************************************************************************/
646 /* permission checks */
647 static int proc_fd_access_allowed(struct inode
*inode
)
649 struct task_struct
*task
;
651 /* Allow access to a task's file descriptors if it is us or we
652 * may use ptrace attach to the process and find out that
655 task
= get_proc_task(inode
);
657 allowed
= ptrace_may_access(task
, PTRACE_MODE_READ_FSCREDS
);
658 put_task_struct(task
);
663 int proc_setattr(struct dentry
*dentry
, struct iattr
*attr
)
666 struct inode
*inode
= d_inode(dentry
);
668 if (attr
->ia_valid
& ATTR_MODE
)
671 error
= setattr_prepare(dentry
, attr
);
675 setattr_copy(inode
, attr
);
676 mark_inode_dirty(inode
);
681 * May current process learn task's sched/cmdline info (for hide_pid_min=1)
682 * or euid/egid (for hide_pid_min=2)?
684 static bool has_pid_permissions(struct pid_namespace
*pid
,
685 struct task_struct
*task
,
688 if (pid
->hide_pid
< hide_pid_min
)
690 if (in_group_p(pid
->pid_gid
))
692 return ptrace_may_access(task
, PTRACE_MODE_READ_FSCREDS
);
696 static int proc_pid_permission(struct inode
*inode
, int mask
)
698 struct pid_namespace
*pid
= inode
->i_sb
->s_fs_info
;
699 struct task_struct
*task
;
702 task
= get_proc_task(inode
);
705 has_perms
= has_pid_permissions(pid
, task
, HIDEPID_NO_ACCESS
);
706 put_task_struct(task
);
709 if (pid
->hide_pid
== HIDEPID_INVISIBLE
) {
711 * Let's make getdents(), stat(), and open()
712 * consistent with each other. If a process
713 * may not stat() a file, it shouldn't be seen
721 return generic_permission(inode
, mask
);
726 static const struct inode_operations proc_def_inode_operations
= {
727 .setattr
= proc_setattr
,
730 static int proc_single_show(struct seq_file
*m
, void *v
)
732 struct inode
*inode
= m
->private;
733 struct pid_namespace
*ns
;
735 struct task_struct
*task
;
738 ns
= inode
->i_sb
->s_fs_info
;
739 pid
= proc_pid(inode
);
740 task
= get_pid_task(pid
, PIDTYPE_PID
);
744 ret
= PROC_I(inode
)->op
.proc_show(m
, ns
, pid
, task
);
746 put_task_struct(task
);
750 static int proc_single_open(struct inode
*inode
, struct file
*filp
)
752 return single_open(filp
, proc_single_show
, inode
);
755 static const struct file_operations proc_single_file_operations
= {
756 .open
= proc_single_open
,
759 .release
= single_release
,
763 struct mm_struct
*proc_mem_open(struct inode
*inode
, unsigned int mode
)
765 struct task_struct
*task
= get_proc_task(inode
);
766 struct mm_struct
*mm
= ERR_PTR(-ESRCH
);
769 mm
= mm_access(task
, mode
| PTRACE_MODE_FSCREDS
);
770 put_task_struct(task
);
772 if (!IS_ERR_OR_NULL(mm
)) {
773 /* ensure this mm_struct can't be freed */
775 /* but do not pin its memory */
783 static int __mem_open(struct inode
*inode
, struct file
*file
, unsigned int mode
)
785 struct mm_struct
*mm
= proc_mem_open(inode
, mode
);
790 file
->private_data
= mm
;
794 static int mem_open(struct inode
*inode
, struct file
*file
)
796 int ret
= __mem_open(inode
, file
, PTRACE_MODE_ATTACH
);
798 /* OK to pass negative loff_t, we can catch out-of-range */
799 file
->f_mode
|= FMODE_UNSIGNED_OFFSET
;
804 static ssize_t
mem_rw(struct file
*file
, char __user
*buf
,
805 size_t count
, loff_t
*ppos
, int write
)
807 struct mm_struct
*mm
= file
->private_data
;
808 unsigned long addr
= *ppos
;
816 page
= (char *)__get_free_page(GFP_TEMPORARY
);
821 if (!mmget_not_zero(mm
))
824 flags
= FOLL_FORCE
| (write
? FOLL_WRITE
: 0);
827 int this_len
= min_t(int, count
, PAGE_SIZE
);
829 if (write
&& copy_from_user(page
, buf
, this_len
)) {
834 this_len
= access_remote_vm(mm
, addr
, page
, this_len
, flags
);
841 if (!write
&& copy_to_user(buf
, page
, this_len
)) {
855 free_page((unsigned long) page
);
859 static ssize_t
mem_read(struct file
*file
, char __user
*buf
,
860 size_t count
, loff_t
*ppos
)
862 return mem_rw(file
, buf
, count
, ppos
, 0);
865 static ssize_t
mem_write(struct file
*file
, const char __user
*buf
,
866 size_t count
, loff_t
*ppos
)
868 return mem_rw(file
, (char __user
*)buf
, count
, ppos
, 1);
871 loff_t
mem_lseek(struct file
*file
, loff_t offset
, int orig
)
875 file
->f_pos
= offset
;
878 file
->f_pos
+= offset
;
883 force_successful_syscall_return();
887 static int mem_release(struct inode
*inode
, struct file
*file
)
889 struct mm_struct
*mm
= file
->private_data
;
895 static const struct file_operations proc_mem_operations
= {
900 .release
= mem_release
,
903 static int environ_open(struct inode
*inode
, struct file
*file
)
905 return __mem_open(inode
, file
, PTRACE_MODE_READ
);
908 static ssize_t
environ_read(struct file
*file
, char __user
*buf
,
909 size_t count
, loff_t
*ppos
)
912 unsigned long src
= *ppos
;
914 struct mm_struct
*mm
= file
->private_data
;
915 unsigned long env_start
, env_end
;
917 /* Ensure the process spawned far enough to have an environment. */
918 if (!mm
|| !mm
->env_end
)
921 page
= (char *)__get_free_page(GFP_TEMPORARY
);
926 if (!mmget_not_zero(mm
))
929 down_read(&mm
->mmap_sem
);
930 env_start
= mm
->env_start
;
931 env_end
= mm
->env_end
;
932 up_read(&mm
->mmap_sem
);
935 size_t this_len
, max_len
;
938 if (src
>= (env_end
- env_start
))
941 this_len
= env_end
- (env_start
+ src
);
943 max_len
= min_t(size_t, PAGE_SIZE
, count
);
944 this_len
= min(max_len
, this_len
);
946 retval
= access_remote_vm(mm
, (env_start
+ src
), page
, this_len
, 0);
953 if (copy_to_user(buf
, page
, retval
)) {
967 free_page((unsigned long) page
);
971 static const struct file_operations proc_environ_operations
= {
972 .open
= environ_open
,
973 .read
= environ_read
,
974 .llseek
= generic_file_llseek
,
975 .release
= mem_release
,
978 static int auxv_open(struct inode
*inode
, struct file
*file
)
980 return __mem_open(inode
, file
, PTRACE_MODE_READ_FSCREDS
);
983 static ssize_t
auxv_read(struct file
*file
, char __user
*buf
,
984 size_t count
, loff_t
*ppos
)
986 struct mm_struct
*mm
= file
->private_data
;
987 unsigned int nwords
= 0;
993 } while (mm
->saved_auxv
[nwords
- 2] != 0); /* AT_NULL */
994 return simple_read_from_buffer(buf
, count
, ppos
, mm
->saved_auxv
,
995 nwords
* sizeof(mm
->saved_auxv
[0]));
998 static const struct file_operations proc_auxv_operations
= {
1001 .llseek
= generic_file_llseek
,
1002 .release
= mem_release
,
1005 static ssize_t
oom_adj_read(struct file
*file
, char __user
*buf
, size_t count
,
1008 struct task_struct
*task
= get_proc_task(file_inode(file
));
1009 char buffer
[PROC_NUMBUF
];
1010 int oom_adj
= OOM_ADJUST_MIN
;
1015 if (task
->signal
->oom_score_adj
== OOM_SCORE_ADJ_MAX
)
1016 oom_adj
= OOM_ADJUST_MAX
;
1018 oom_adj
= (task
->signal
->oom_score_adj
* -OOM_DISABLE
) /
1020 put_task_struct(task
);
1021 len
= snprintf(buffer
, sizeof(buffer
), "%d\n", oom_adj
);
1022 return simple_read_from_buffer(buf
, count
, ppos
, buffer
, len
);
1025 static int __set_oom_adj(struct file
*file
, int oom_adj
, bool legacy
)
1027 static DEFINE_MUTEX(oom_adj_mutex
);
1028 struct mm_struct
*mm
= NULL
;
1029 struct task_struct
*task
;
1032 task
= get_proc_task(file_inode(file
));
1036 mutex_lock(&oom_adj_mutex
);
1038 if (oom_adj
< task
->signal
->oom_score_adj
&&
1039 !capable(CAP_SYS_RESOURCE
)) {
1044 * /proc/pid/oom_adj is provided for legacy purposes, ask users to use
1045 * /proc/pid/oom_score_adj instead.
1047 pr_warn_once("%s (%d): /proc/%d/oom_adj is deprecated, please use /proc/%d/oom_score_adj instead.\n",
1048 current
->comm
, task_pid_nr(current
), task_pid_nr(task
),
1051 if ((short)oom_adj
< task
->signal
->oom_score_adj_min
&&
1052 !capable(CAP_SYS_RESOURCE
)) {
1059 * Make sure we will check other processes sharing the mm if this is
1060 * not vfrok which wants its own oom_score_adj.
1061 * pin the mm so it doesn't go away and get reused after task_unlock
1063 if (!task
->vfork_done
) {
1064 struct task_struct
*p
= find_lock_task_mm(task
);
1067 if (atomic_read(&p
->mm
->mm_users
) > 1) {
1075 task
->signal
->oom_score_adj
= oom_adj
;
1076 if (!legacy
&& has_capability_noaudit(current
, CAP_SYS_RESOURCE
))
1077 task
->signal
->oom_score_adj_min
= (short)oom_adj
;
1078 trace_oom_score_adj_update(task
);
1081 struct task_struct
*p
;
1084 for_each_process(p
) {
1085 if (same_thread_group(task
, p
))
1088 /* do not touch kernel threads or the global init */
1089 if (p
->flags
& PF_KTHREAD
|| is_global_init(p
))
1093 if (!p
->vfork_done
&& process_shares_mm(p
, mm
)) {
1094 pr_info("updating oom_score_adj for %d (%s) from %d to %d because it shares mm with %d (%s). Report if this is unexpected.\n",
1095 task_pid_nr(p
), p
->comm
,
1096 p
->signal
->oom_score_adj
, oom_adj
,
1097 task_pid_nr(task
), task
->comm
);
1098 p
->signal
->oom_score_adj
= oom_adj
;
1099 if (!legacy
&& has_capability_noaudit(current
, CAP_SYS_RESOURCE
))
1100 p
->signal
->oom_score_adj_min
= (short)oom_adj
;
1108 mutex_unlock(&oom_adj_mutex
);
1109 put_task_struct(task
);
1114 * /proc/pid/oom_adj exists solely for backwards compatibility with previous
1115 * kernels. The effective policy is defined by oom_score_adj, which has a
1116 * different scale: oom_adj grew exponentially and oom_score_adj grows linearly.
1117 * Values written to oom_adj are simply mapped linearly to oom_score_adj.
1118 * Processes that become oom disabled via oom_adj will still be oom disabled
1119 * with this implementation.
1121 * oom_adj cannot be removed since existing userspace binaries use it.
1123 static ssize_t
oom_adj_write(struct file
*file
, const char __user
*buf
,
1124 size_t count
, loff_t
*ppos
)
1126 char buffer
[PROC_NUMBUF
];
1130 memset(buffer
, 0, sizeof(buffer
));
1131 if (count
> sizeof(buffer
) - 1)
1132 count
= sizeof(buffer
) - 1;
1133 if (copy_from_user(buffer
, buf
, count
)) {
1138 err
= kstrtoint(strstrip(buffer
), 0, &oom_adj
);
1141 if ((oom_adj
< OOM_ADJUST_MIN
|| oom_adj
> OOM_ADJUST_MAX
) &&
1142 oom_adj
!= OOM_DISABLE
) {
1148 * Scale /proc/pid/oom_score_adj appropriately ensuring that a maximum
1149 * value is always attainable.
1151 if (oom_adj
== OOM_ADJUST_MAX
)
1152 oom_adj
= OOM_SCORE_ADJ_MAX
;
1154 oom_adj
= (oom_adj
* OOM_SCORE_ADJ_MAX
) / -OOM_DISABLE
;
1156 err
= __set_oom_adj(file
, oom_adj
, true);
1158 return err
< 0 ? err
: count
;
1161 static const struct file_operations proc_oom_adj_operations
= {
1162 .read
= oom_adj_read
,
1163 .write
= oom_adj_write
,
1164 .llseek
= generic_file_llseek
,
1167 static ssize_t
oom_score_adj_read(struct file
*file
, char __user
*buf
,
1168 size_t count
, loff_t
*ppos
)
1170 struct task_struct
*task
= get_proc_task(file_inode(file
));
1171 char buffer
[PROC_NUMBUF
];
1172 short oom_score_adj
= OOM_SCORE_ADJ_MIN
;
1177 oom_score_adj
= task
->signal
->oom_score_adj
;
1178 put_task_struct(task
);
1179 len
= snprintf(buffer
, sizeof(buffer
), "%hd\n", oom_score_adj
);
1180 return simple_read_from_buffer(buf
, count
, ppos
, buffer
, len
);
1183 static ssize_t
oom_score_adj_write(struct file
*file
, const char __user
*buf
,
1184 size_t count
, loff_t
*ppos
)
1186 char buffer
[PROC_NUMBUF
];
1190 memset(buffer
, 0, sizeof(buffer
));
1191 if (count
> sizeof(buffer
) - 1)
1192 count
= sizeof(buffer
) - 1;
1193 if (copy_from_user(buffer
, buf
, count
)) {
1198 err
= kstrtoint(strstrip(buffer
), 0, &oom_score_adj
);
1201 if (oom_score_adj
< OOM_SCORE_ADJ_MIN
||
1202 oom_score_adj
> OOM_SCORE_ADJ_MAX
) {
1207 err
= __set_oom_adj(file
, oom_score_adj
, false);
1209 return err
< 0 ? err
: count
;
1212 static const struct file_operations proc_oom_score_adj_operations
= {
1213 .read
= oom_score_adj_read
,
1214 .write
= oom_score_adj_write
,
1215 .llseek
= default_llseek
,
1218 #ifdef CONFIG_AUDITSYSCALL
1219 #define TMPBUFLEN 11
1220 static ssize_t
proc_loginuid_read(struct file
* file
, char __user
* buf
,
1221 size_t count
, loff_t
*ppos
)
1223 struct inode
* inode
= file_inode(file
);
1224 struct task_struct
*task
= get_proc_task(inode
);
1226 char tmpbuf
[TMPBUFLEN
];
1230 length
= scnprintf(tmpbuf
, TMPBUFLEN
, "%u",
1231 from_kuid(file
->f_cred
->user_ns
,
1232 audit_get_loginuid(task
)));
1233 put_task_struct(task
);
1234 return simple_read_from_buffer(buf
, count
, ppos
, tmpbuf
, length
);
1237 static ssize_t
proc_loginuid_write(struct file
* file
, const char __user
* buf
,
1238 size_t count
, loff_t
*ppos
)
1240 struct inode
* inode
= file_inode(file
);
1246 if (current
!= pid_task(proc_pid(inode
), PIDTYPE_PID
)) {
1253 /* No partial writes. */
1257 rv
= kstrtou32_from_user(buf
, count
, 10, &loginuid
);
1261 /* is userspace tring to explicitly UNSET the loginuid? */
1262 if (loginuid
== AUDIT_UID_UNSET
) {
1263 kloginuid
= INVALID_UID
;
1265 kloginuid
= make_kuid(file
->f_cred
->user_ns
, loginuid
);
1266 if (!uid_valid(kloginuid
))
1270 rv
= audit_set_loginuid(kloginuid
);
1276 static const struct file_operations proc_loginuid_operations
= {
1277 .read
= proc_loginuid_read
,
1278 .write
= proc_loginuid_write
,
1279 .llseek
= generic_file_llseek
,
1282 static ssize_t
proc_sessionid_read(struct file
* file
, char __user
* buf
,
1283 size_t count
, loff_t
*ppos
)
1285 struct inode
* inode
= file_inode(file
);
1286 struct task_struct
*task
= get_proc_task(inode
);
1288 char tmpbuf
[TMPBUFLEN
];
1292 length
= scnprintf(tmpbuf
, TMPBUFLEN
, "%u",
1293 audit_get_sessionid(task
));
1294 put_task_struct(task
);
1295 return simple_read_from_buffer(buf
, count
, ppos
, tmpbuf
, length
);
1298 static const struct file_operations proc_sessionid_operations
= {
1299 .read
= proc_sessionid_read
,
1300 .llseek
= generic_file_llseek
,
1304 #ifdef CONFIG_FAULT_INJECTION
1305 static ssize_t
proc_fault_inject_read(struct file
* file
, char __user
* buf
,
1306 size_t count
, loff_t
*ppos
)
1308 struct task_struct
*task
= get_proc_task(file_inode(file
));
1309 char buffer
[PROC_NUMBUF
];
1315 make_it_fail
= task
->make_it_fail
;
1316 put_task_struct(task
);
1318 len
= snprintf(buffer
, sizeof(buffer
), "%i\n", make_it_fail
);
1320 return simple_read_from_buffer(buf
, count
, ppos
, buffer
, len
);
1323 static ssize_t
proc_fault_inject_write(struct file
* file
,
1324 const char __user
* buf
, size_t count
, loff_t
*ppos
)
1326 struct task_struct
*task
;
1327 char buffer
[PROC_NUMBUF
];
1331 if (!capable(CAP_SYS_RESOURCE
))
1333 memset(buffer
, 0, sizeof(buffer
));
1334 if (count
> sizeof(buffer
) - 1)
1335 count
= sizeof(buffer
) - 1;
1336 if (copy_from_user(buffer
, buf
, count
))
1338 rv
= kstrtoint(strstrip(buffer
), 0, &make_it_fail
);
1341 if (make_it_fail
< 0 || make_it_fail
> 1)
1344 task
= get_proc_task(file_inode(file
));
1347 task
->make_it_fail
= make_it_fail
;
1348 put_task_struct(task
);
1353 static const struct file_operations proc_fault_inject_operations
= {
1354 .read
= proc_fault_inject_read
,
1355 .write
= proc_fault_inject_write
,
1356 .llseek
= generic_file_llseek
,
1359 static ssize_t
proc_fail_nth_write(struct file
*file
, const char __user
*buf
,
1360 size_t count
, loff_t
*ppos
)
1362 struct task_struct
*task
;
1366 err
= kstrtouint_from_user(buf
, count
, 0, &n
);
1370 task
= get_proc_task(file_inode(file
));
1373 WRITE_ONCE(task
->fail_nth
, n
);
1374 put_task_struct(task
);
1379 static ssize_t
proc_fail_nth_read(struct file
*file
, char __user
*buf
,
1380 size_t count
, loff_t
*ppos
)
1382 struct task_struct
*task
;
1383 char numbuf
[PROC_NUMBUF
];
1386 task
= get_proc_task(file_inode(file
));
1389 len
= snprintf(numbuf
, sizeof(numbuf
), "%u\n",
1390 READ_ONCE(task
->fail_nth
));
1391 len
= simple_read_from_buffer(buf
, count
, ppos
, numbuf
, len
);
1392 put_task_struct(task
);
1397 static const struct file_operations proc_fail_nth_operations
= {
1398 .read
= proc_fail_nth_read
,
1399 .write
= proc_fail_nth_write
,
1404 #ifdef CONFIG_SCHED_DEBUG
1406 * Print out various scheduling related per-task fields:
1408 static int sched_show(struct seq_file
*m
, void *v
)
1410 struct inode
*inode
= m
->private;
1411 struct task_struct
*p
;
1413 p
= get_proc_task(inode
);
1416 proc_sched_show_task(p
, m
);
1424 sched_write(struct file
*file
, const char __user
*buf
,
1425 size_t count
, loff_t
*offset
)
1427 struct inode
*inode
= file_inode(file
);
1428 struct task_struct
*p
;
1430 p
= get_proc_task(inode
);
1433 proc_sched_set_task(p
);
1440 static int sched_open(struct inode
*inode
, struct file
*filp
)
1442 return single_open(filp
, sched_show
, inode
);
1445 static const struct file_operations proc_pid_sched_operations
= {
1448 .write
= sched_write
,
1449 .llseek
= seq_lseek
,
1450 .release
= single_release
,
1455 #ifdef CONFIG_SCHED_AUTOGROUP
1457 * Print out autogroup related information:
1459 static int sched_autogroup_show(struct seq_file
*m
, void *v
)
1461 struct inode
*inode
= m
->private;
1462 struct task_struct
*p
;
1464 p
= get_proc_task(inode
);
1467 proc_sched_autogroup_show_task(p
, m
);
1475 sched_autogroup_write(struct file
*file
, const char __user
*buf
,
1476 size_t count
, loff_t
*offset
)
1478 struct inode
*inode
= file_inode(file
);
1479 struct task_struct
*p
;
1480 char buffer
[PROC_NUMBUF
];
1484 memset(buffer
, 0, sizeof(buffer
));
1485 if (count
> sizeof(buffer
) - 1)
1486 count
= sizeof(buffer
) - 1;
1487 if (copy_from_user(buffer
, buf
, count
))
1490 err
= kstrtoint(strstrip(buffer
), 0, &nice
);
1494 p
= get_proc_task(inode
);
1498 err
= proc_sched_autogroup_set_nice(p
, nice
);
1507 static int sched_autogroup_open(struct inode
*inode
, struct file
*filp
)
1511 ret
= single_open(filp
, sched_autogroup_show
, NULL
);
1513 struct seq_file
*m
= filp
->private_data
;
1520 static const struct file_operations proc_pid_sched_autogroup_operations
= {
1521 .open
= sched_autogroup_open
,
1523 .write
= sched_autogroup_write
,
1524 .llseek
= seq_lseek
,
1525 .release
= single_release
,
1528 #endif /* CONFIG_SCHED_AUTOGROUP */
1530 static ssize_t
comm_write(struct file
*file
, const char __user
*buf
,
1531 size_t count
, loff_t
*offset
)
1533 struct inode
*inode
= file_inode(file
);
1534 struct task_struct
*p
;
1535 char buffer
[TASK_COMM_LEN
];
1536 const size_t maxlen
= sizeof(buffer
) - 1;
1538 memset(buffer
, 0, sizeof(buffer
));
1539 if (copy_from_user(buffer
, buf
, count
> maxlen
? maxlen
: count
))
1542 p
= get_proc_task(inode
);
1546 if (same_thread_group(current
, p
))
1547 set_task_comm(p
, buffer
);
1556 static int comm_show(struct seq_file
*m
, void *v
)
1558 struct inode
*inode
= m
->private;
1559 struct task_struct
*p
;
1561 p
= get_proc_task(inode
);
1566 seq_printf(m
, "%s\n", p
->comm
);
1574 static int comm_open(struct inode
*inode
, struct file
*filp
)
1576 return single_open(filp
, comm_show
, inode
);
1579 static const struct file_operations proc_pid_set_comm_operations
= {
1582 .write
= comm_write
,
1583 .llseek
= seq_lseek
,
1584 .release
= single_release
,
1587 static int proc_exe_link(struct dentry
*dentry
, struct path
*exe_path
)
1589 struct task_struct
*task
;
1590 struct file
*exe_file
;
1592 task
= get_proc_task(d_inode(dentry
));
1595 exe_file
= get_task_exe_file(task
);
1596 put_task_struct(task
);
1598 *exe_path
= exe_file
->f_path
;
1599 path_get(&exe_file
->f_path
);
1606 static const char *proc_pid_get_link(struct dentry
*dentry
,
1607 struct inode
*inode
,
1608 struct delayed_call
*done
)
1611 int error
= -EACCES
;
1614 return ERR_PTR(-ECHILD
);
1616 /* Are we allowed to snoop on the tasks file descriptors? */
1617 if (!proc_fd_access_allowed(inode
))
1620 error
= PROC_I(inode
)->op
.proc_get_link(dentry
, &path
);
1624 nd_jump_link(&path
);
1627 return ERR_PTR(error
);
1630 static int do_proc_readlink(struct path
*path
, char __user
*buffer
, int buflen
)
1632 char *tmp
= (char*)__get_free_page(GFP_TEMPORARY
);
1639 pathname
= d_path(path
, tmp
, PAGE_SIZE
);
1640 len
= PTR_ERR(pathname
);
1641 if (IS_ERR(pathname
))
1643 len
= tmp
+ PAGE_SIZE
- 1 - pathname
;
1647 if (copy_to_user(buffer
, pathname
, len
))
1650 free_page((unsigned long)tmp
);
1654 static int proc_pid_readlink(struct dentry
* dentry
, char __user
* buffer
, int buflen
)
1656 int error
= -EACCES
;
1657 struct inode
*inode
= d_inode(dentry
);
1660 /* Are we allowed to snoop on the tasks file descriptors? */
1661 if (!proc_fd_access_allowed(inode
))
1664 error
= PROC_I(inode
)->op
.proc_get_link(dentry
, &path
);
1668 error
= do_proc_readlink(&path
, buffer
, buflen
);
1674 const struct inode_operations proc_pid_link_inode_operations
= {
1675 .readlink
= proc_pid_readlink
,
1676 .get_link
= proc_pid_get_link
,
1677 .setattr
= proc_setattr
,
1681 /* building an inode */
1683 void task_dump_owner(struct task_struct
*task
, mode_t mode
,
1684 kuid_t
*ruid
, kgid_t
*rgid
)
1686 /* Depending on the state of dumpable compute who should own a
1687 * proc file for a task.
1689 const struct cred
*cred
;
1693 /* Default to the tasks effective ownership */
1695 cred
= __task_cred(task
);
1701 * Before the /proc/pid/status file was created the only way to read
1702 * the effective uid of a /process was to stat /proc/pid. Reading
1703 * /proc/pid/status is slow enough that procps and other packages
1704 * kept stating /proc/pid. To keep the rules in /proc simple I have
1705 * made this apply to all per process world readable and executable
1708 if (mode
!= (S_IFDIR
|S_IRUGO
|S_IXUGO
)) {
1709 struct mm_struct
*mm
;
1712 /* Make non-dumpable tasks owned by some root */
1714 if (get_dumpable(mm
) != SUID_DUMP_USER
) {
1715 struct user_namespace
*user_ns
= mm
->user_ns
;
1717 uid
= make_kuid(user_ns
, 0);
1718 if (!uid_valid(uid
))
1719 uid
= GLOBAL_ROOT_UID
;
1721 gid
= make_kgid(user_ns
, 0);
1722 if (!gid_valid(gid
))
1723 gid
= GLOBAL_ROOT_GID
;
1726 uid
= GLOBAL_ROOT_UID
;
1727 gid
= GLOBAL_ROOT_GID
;
1735 struct inode
*proc_pid_make_inode(struct super_block
* sb
,
1736 struct task_struct
*task
, umode_t mode
)
1738 struct inode
* inode
;
1739 struct proc_inode
*ei
;
1741 /* We need a new inode */
1743 inode
= new_inode(sb
);
1749 inode
->i_mode
= mode
;
1750 inode
->i_ino
= get_next_ino();
1751 inode
->i_mtime
= inode
->i_atime
= inode
->i_ctime
= current_time(inode
);
1752 inode
->i_op
= &proc_def_inode_operations
;
1755 * grab the reference to task.
1757 ei
->pid
= get_task_pid(task
, PIDTYPE_PID
);
1761 task_dump_owner(task
, 0, &inode
->i_uid
, &inode
->i_gid
);
1762 security_task_to_inode(task
, inode
);
1772 int pid_getattr(const struct path
*path
, struct kstat
*stat
,
1773 u32 request_mask
, unsigned int query_flags
)
1775 struct inode
*inode
= d_inode(path
->dentry
);
1776 struct task_struct
*task
;
1777 struct pid_namespace
*pid
= path
->dentry
->d_sb
->s_fs_info
;
1779 generic_fillattr(inode
, stat
);
1782 stat
->uid
= GLOBAL_ROOT_UID
;
1783 stat
->gid
= GLOBAL_ROOT_GID
;
1784 task
= pid_task(proc_pid(inode
), PIDTYPE_PID
);
1786 if (!has_pid_permissions(pid
, task
, HIDEPID_INVISIBLE
)) {
1789 * This doesn't prevent learning whether PID exists,
1790 * it only makes getattr() consistent with readdir().
1794 task_dump_owner(task
, inode
->i_mode
, &stat
->uid
, &stat
->gid
);
1803 * Exceptional case: normally we are not allowed to unhash a busy
1804 * directory. In this case, however, we can do it - no aliasing problems
1805 * due to the way we treat inodes.
1807 * Rewrite the inode's ownerships here because the owning task may have
1808 * performed a setuid(), etc.
1811 int pid_revalidate(struct dentry
*dentry
, unsigned int flags
)
1813 struct inode
*inode
;
1814 struct task_struct
*task
;
1816 if (flags
& LOOKUP_RCU
)
1819 inode
= d_inode(dentry
);
1820 task
= get_proc_task(inode
);
1823 task_dump_owner(task
, inode
->i_mode
, &inode
->i_uid
, &inode
->i_gid
);
1825 inode
->i_mode
&= ~(S_ISUID
| S_ISGID
);
1826 security_task_to_inode(task
, inode
);
1827 put_task_struct(task
);
1833 static inline bool proc_inode_is_dead(struct inode
*inode
)
1835 return !proc_pid(inode
)->tasks
[PIDTYPE_PID
].first
;
1838 int pid_delete_dentry(const struct dentry
*dentry
)
1840 /* Is the task we represent dead?
1841 * If so, then don't put the dentry on the lru list,
1842 * kill it immediately.
1844 return proc_inode_is_dead(d_inode(dentry
));
1847 const struct dentry_operations pid_dentry_operations
=
1849 .d_revalidate
= pid_revalidate
,
1850 .d_delete
= pid_delete_dentry
,
1856 * Fill a directory entry.
1858 * If possible create the dcache entry and derive our inode number and
1859 * file type from dcache entry.
1861 * Since all of the proc inode numbers are dynamically generated, the inode
1862 * numbers do not exist until the inode is cache. This means creating the
1863 * the dcache entry in readdir is necessary to keep the inode numbers
1864 * reported by readdir in sync with the inode numbers reported
1867 bool proc_fill_cache(struct file
*file
, struct dir_context
*ctx
,
1868 const char *name
, int len
,
1869 instantiate_t instantiate
, struct task_struct
*task
, const void *ptr
)
1871 struct dentry
*child
, *dir
= file
->f_path
.dentry
;
1872 struct qstr qname
= QSTR_INIT(name
, len
);
1873 struct inode
*inode
;
1877 child
= d_hash_and_lookup(dir
, &qname
);
1879 DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq
);
1880 child
= d_alloc_parallel(dir
, &qname
, &wq
);
1882 goto end_instantiate
;
1883 if (d_in_lookup(child
)) {
1884 int err
= instantiate(d_inode(dir
), child
, task
, ptr
);
1885 d_lookup_done(child
);
1888 goto end_instantiate
;
1892 inode
= d_inode(child
);
1894 type
= inode
->i_mode
>> 12;
1896 return dir_emit(ctx
, name
, len
, ino
, type
);
1899 return dir_emit(ctx
, name
, len
, 1, DT_UNKNOWN
);
1903 * dname_to_vma_addr - maps a dentry name into two unsigned longs
1904 * which represent vma start and end addresses.
1906 static int dname_to_vma_addr(struct dentry
*dentry
,
1907 unsigned long *start
, unsigned long *end
)
1909 if (sscanf(dentry
->d_name
.name
, "%lx-%lx", start
, end
) != 2)
1915 static int map_files_d_revalidate(struct dentry
*dentry
, unsigned int flags
)
1917 unsigned long vm_start
, vm_end
;
1918 bool exact_vma_exists
= false;
1919 struct mm_struct
*mm
= NULL
;
1920 struct task_struct
*task
;
1921 struct inode
*inode
;
1924 if (flags
& LOOKUP_RCU
)
1927 inode
= d_inode(dentry
);
1928 task
= get_proc_task(inode
);
1932 mm
= mm_access(task
, PTRACE_MODE_READ_FSCREDS
);
1933 if (IS_ERR_OR_NULL(mm
))
1936 if (!dname_to_vma_addr(dentry
, &vm_start
, &vm_end
)) {
1937 down_read(&mm
->mmap_sem
);
1938 exact_vma_exists
= !!find_exact_vma(mm
, vm_start
, vm_end
);
1939 up_read(&mm
->mmap_sem
);
1944 if (exact_vma_exists
) {
1945 task_dump_owner(task
, 0, &inode
->i_uid
, &inode
->i_gid
);
1947 security_task_to_inode(task
, inode
);
1952 put_task_struct(task
);
1958 static const struct dentry_operations tid_map_files_dentry_operations
= {
1959 .d_revalidate
= map_files_d_revalidate
,
1960 .d_delete
= pid_delete_dentry
,
1963 static int map_files_get_link(struct dentry
*dentry
, struct path
*path
)
1965 unsigned long vm_start
, vm_end
;
1966 struct vm_area_struct
*vma
;
1967 struct task_struct
*task
;
1968 struct mm_struct
*mm
;
1972 task
= get_proc_task(d_inode(dentry
));
1976 mm
= get_task_mm(task
);
1977 put_task_struct(task
);
1981 rc
= dname_to_vma_addr(dentry
, &vm_start
, &vm_end
);
1986 down_read(&mm
->mmap_sem
);
1987 vma
= find_exact_vma(mm
, vm_start
, vm_end
);
1988 if (vma
&& vma
->vm_file
) {
1989 *path
= vma
->vm_file
->f_path
;
1993 up_read(&mm
->mmap_sem
);
2001 struct map_files_info
{
2004 unsigned char name
[4*sizeof(long)+2]; /* max: %lx-%lx\0 */
2008 * Only allow CAP_SYS_ADMIN to follow the links, due to concerns about how the
2009 * symlinks may be used to bypass permissions on ancestor directories in the
2010 * path to the file in question.
2013 proc_map_files_get_link(struct dentry
*dentry
,
2014 struct inode
*inode
,
2015 struct delayed_call
*done
)
2017 if (!capable(CAP_SYS_ADMIN
))
2018 return ERR_PTR(-EPERM
);
2020 return proc_pid_get_link(dentry
, inode
, done
);
2024 * Identical to proc_pid_link_inode_operations except for get_link()
2026 static const struct inode_operations proc_map_files_link_inode_operations
= {
2027 .readlink
= proc_pid_readlink
,
2028 .get_link
= proc_map_files_get_link
,
2029 .setattr
= proc_setattr
,
2033 proc_map_files_instantiate(struct inode
*dir
, struct dentry
*dentry
,
2034 struct task_struct
*task
, const void *ptr
)
2036 fmode_t mode
= (fmode_t
)(unsigned long)ptr
;
2037 struct proc_inode
*ei
;
2038 struct inode
*inode
;
2040 inode
= proc_pid_make_inode(dir
->i_sb
, task
, S_IFLNK
|
2041 ((mode
& FMODE_READ
) ? S_IRUSR
: 0) |
2042 ((mode
& FMODE_WRITE
) ? S_IWUSR
: 0));
2047 ei
->op
.proc_get_link
= map_files_get_link
;
2049 inode
->i_op
= &proc_map_files_link_inode_operations
;
2052 d_set_d_op(dentry
, &tid_map_files_dentry_operations
);
2053 d_add(dentry
, inode
);
2058 static struct dentry
*proc_map_files_lookup(struct inode
*dir
,
2059 struct dentry
*dentry
, unsigned int flags
)
2061 unsigned long vm_start
, vm_end
;
2062 struct vm_area_struct
*vma
;
2063 struct task_struct
*task
;
2065 struct mm_struct
*mm
;
2068 task
= get_proc_task(dir
);
2073 if (!ptrace_may_access(task
, PTRACE_MODE_READ_FSCREDS
))
2077 if (dname_to_vma_addr(dentry
, &vm_start
, &vm_end
))
2080 mm
= get_task_mm(task
);
2084 down_read(&mm
->mmap_sem
);
2085 vma
= find_exact_vma(mm
, vm_start
, vm_end
);
2090 result
= proc_map_files_instantiate(dir
, dentry
, task
,
2091 (void *)(unsigned long)vma
->vm_file
->f_mode
);
2094 up_read(&mm
->mmap_sem
);
2097 put_task_struct(task
);
2099 return ERR_PTR(result
);
2102 static const struct inode_operations proc_map_files_inode_operations
= {
2103 .lookup
= proc_map_files_lookup
,
2104 .permission
= proc_fd_permission
,
2105 .setattr
= proc_setattr
,
2109 proc_map_files_readdir(struct file
*file
, struct dir_context
*ctx
)
2111 struct vm_area_struct
*vma
;
2112 struct task_struct
*task
;
2113 struct mm_struct
*mm
;
2114 unsigned long nr_files
, pos
, i
;
2115 struct flex_array
*fa
= NULL
;
2116 struct map_files_info info
;
2117 struct map_files_info
*p
;
2121 task
= get_proc_task(file_inode(file
));
2126 if (!ptrace_may_access(task
, PTRACE_MODE_READ_FSCREDS
))
2130 if (!dir_emit_dots(file
, ctx
))
2133 mm
= get_task_mm(task
);
2136 down_read(&mm
->mmap_sem
);
2141 * We need two passes here:
2143 * 1) Collect vmas of mapped files with mmap_sem taken
2144 * 2) Release mmap_sem and instantiate entries
2146 * otherwise we get lockdep complained, since filldir()
2147 * routine might require mmap_sem taken in might_fault().
2150 for (vma
= mm
->mmap
, pos
= 2; vma
; vma
= vma
->vm_next
) {
2151 if (vma
->vm_file
&& ++pos
> ctx
->pos
)
2156 fa
= flex_array_alloc(sizeof(info
), nr_files
,
2158 if (!fa
|| flex_array_prealloc(fa
, 0, nr_files
,
2162 flex_array_free(fa
);
2163 up_read(&mm
->mmap_sem
);
2167 for (i
= 0, vma
= mm
->mmap
, pos
= 2; vma
;
2168 vma
= vma
->vm_next
) {
2171 if (++pos
<= ctx
->pos
)
2174 info
.mode
= vma
->vm_file
->f_mode
;
2175 info
.len
= snprintf(info
.name
,
2176 sizeof(info
.name
), "%lx-%lx",
2177 vma
->vm_start
, vma
->vm_end
);
2178 if (flex_array_put(fa
, i
++, &info
, GFP_KERNEL
))
2182 up_read(&mm
->mmap_sem
);
2184 for (i
= 0; i
< nr_files
; i
++) {
2185 p
= flex_array_get(fa
, i
);
2186 if (!proc_fill_cache(file
, ctx
,
2188 proc_map_files_instantiate
,
2190 (void *)(unsigned long)p
->mode
))
2195 flex_array_free(fa
);
2199 put_task_struct(task
);
2204 static const struct file_operations proc_map_files_operations
= {
2205 .read
= generic_read_dir
,
2206 .iterate_shared
= proc_map_files_readdir
,
2207 .llseek
= generic_file_llseek
,
2210 #if defined(CONFIG_CHECKPOINT_RESTORE) && defined(CONFIG_POSIX_TIMERS)
2211 struct timers_private
{
2213 struct task_struct
*task
;
2214 struct sighand_struct
*sighand
;
2215 struct pid_namespace
*ns
;
2216 unsigned long flags
;
2219 static void *timers_start(struct seq_file
*m
, loff_t
*pos
)
2221 struct timers_private
*tp
= m
->private;
2223 tp
->task
= get_pid_task(tp
->pid
, PIDTYPE_PID
);
2225 return ERR_PTR(-ESRCH
);
2227 tp
->sighand
= lock_task_sighand(tp
->task
, &tp
->flags
);
2229 return ERR_PTR(-ESRCH
);
2231 return seq_list_start(&tp
->task
->signal
->posix_timers
, *pos
);
2234 static void *timers_next(struct seq_file
*m
, void *v
, loff_t
*pos
)
2236 struct timers_private
*tp
= m
->private;
2237 return seq_list_next(v
, &tp
->task
->signal
->posix_timers
, pos
);
2240 static void timers_stop(struct seq_file
*m
, void *v
)
2242 struct timers_private
*tp
= m
->private;
2245 unlock_task_sighand(tp
->task
, &tp
->flags
);
2250 put_task_struct(tp
->task
);
2255 static int show_timer(struct seq_file
*m
, void *v
)
2257 struct k_itimer
*timer
;
2258 struct timers_private
*tp
= m
->private;
2260 static const char * const nstr
[] = {
2261 [SIGEV_SIGNAL
] = "signal",
2262 [SIGEV_NONE
] = "none",
2263 [SIGEV_THREAD
] = "thread",
2266 timer
= list_entry((struct list_head
*)v
, struct k_itimer
, list
);
2267 notify
= timer
->it_sigev_notify
;
2269 seq_printf(m
, "ID: %d\n", timer
->it_id
);
2270 seq_printf(m
, "signal: %d/%p\n",
2271 timer
->sigq
->info
.si_signo
,
2272 timer
->sigq
->info
.si_value
.sival_ptr
);
2273 seq_printf(m
, "notify: %s/%s.%d\n",
2274 nstr
[notify
& ~SIGEV_THREAD_ID
],
2275 (notify
& SIGEV_THREAD_ID
) ? "tid" : "pid",
2276 pid_nr_ns(timer
->it_pid
, tp
->ns
));
2277 seq_printf(m
, "ClockID: %d\n", timer
->it_clock
);
2282 static const struct seq_operations proc_timers_seq_ops
= {
2283 .start
= timers_start
,
2284 .next
= timers_next
,
2285 .stop
= timers_stop
,
2289 static int proc_timers_open(struct inode
*inode
, struct file
*file
)
2291 struct timers_private
*tp
;
2293 tp
= __seq_open_private(file
, &proc_timers_seq_ops
,
2294 sizeof(struct timers_private
));
2298 tp
->pid
= proc_pid(inode
);
2299 tp
->ns
= inode
->i_sb
->s_fs_info
;
2303 static const struct file_operations proc_timers_operations
= {
2304 .open
= proc_timers_open
,
2306 .llseek
= seq_lseek
,
2307 .release
= seq_release_private
,
2311 static ssize_t
timerslack_ns_write(struct file
*file
, const char __user
*buf
,
2312 size_t count
, loff_t
*offset
)
2314 struct inode
*inode
= file_inode(file
);
2315 struct task_struct
*p
;
2319 err
= kstrtoull_from_user(buf
, count
, 10, &slack_ns
);
2323 p
= get_proc_task(inode
);
2328 if (!capable(CAP_SYS_NICE
)) {
2333 err
= security_task_setscheduler(p
);
2342 p
->timer_slack_ns
= p
->default_timer_slack_ns
;
2344 p
->timer_slack_ns
= slack_ns
;
2353 static int timerslack_ns_show(struct seq_file
*m
, void *v
)
2355 struct inode
*inode
= m
->private;
2356 struct task_struct
*p
;
2359 p
= get_proc_task(inode
);
2365 if (!capable(CAP_SYS_NICE
)) {
2369 err
= security_task_getscheduler(p
);
2375 seq_printf(m
, "%llu\n", p
->timer_slack_ns
);
2384 static int timerslack_ns_open(struct inode
*inode
, struct file
*filp
)
2386 return single_open(filp
, timerslack_ns_show
, inode
);
2389 static const struct file_operations proc_pid_set_timerslack_ns_operations
= {
2390 .open
= timerslack_ns_open
,
2392 .write
= timerslack_ns_write
,
2393 .llseek
= seq_lseek
,
2394 .release
= single_release
,
2397 static int proc_pident_instantiate(struct inode
*dir
,
2398 struct dentry
*dentry
, struct task_struct
*task
, const void *ptr
)
2400 const struct pid_entry
*p
= ptr
;
2401 struct inode
*inode
;
2402 struct proc_inode
*ei
;
2404 inode
= proc_pid_make_inode(dir
->i_sb
, task
, p
->mode
);
2409 if (S_ISDIR(inode
->i_mode
))
2410 set_nlink(inode
, 2); /* Use getattr to fix if necessary */
2412 inode
->i_op
= p
->iop
;
2414 inode
->i_fop
= p
->fop
;
2416 d_set_d_op(dentry
, &pid_dentry_operations
);
2417 d_add(dentry
, inode
);
2418 /* Close the race of the process dying before we return the dentry */
2419 if (pid_revalidate(dentry
, 0))
2425 static struct dentry
*proc_pident_lookup(struct inode
*dir
,
2426 struct dentry
*dentry
,
2427 const struct pid_entry
*ents
,
2431 struct task_struct
*task
= get_proc_task(dir
);
2432 const struct pid_entry
*p
, *last
;
2440 * Yes, it does not scale. And it should not. Don't add
2441 * new entries into /proc/<tgid>/ without very good reasons.
2443 last
= &ents
[nents
];
2444 for (p
= ents
; p
< last
; p
++) {
2445 if (p
->len
!= dentry
->d_name
.len
)
2447 if (!memcmp(dentry
->d_name
.name
, p
->name
, p
->len
))
2453 error
= proc_pident_instantiate(dir
, dentry
, task
, p
);
2455 put_task_struct(task
);
2457 return ERR_PTR(error
);
2460 static int proc_pident_readdir(struct file
*file
, struct dir_context
*ctx
,
2461 const struct pid_entry
*ents
, unsigned int nents
)
2463 struct task_struct
*task
= get_proc_task(file_inode(file
));
2464 const struct pid_entry
*p
;
2469 if (!dir_emit_dots(file
, ctx
))
2472 if (ctx
->pos
>= nents
+ 2)
2475 for (p
= ents
+ (ctx
->pos
- 2); p
< ents
+ nents
; p
++) {
2476 if (!proc_fill_cache(file
, ctx
, p
->name
, p
->len
,
2477 proc_pident_instantiate
, task
, p
))
2482 put_task_struct(task
);
2486 #ifdef CONFIG_SECURITY
2487 static ssize_t
proc_pid_attr_read(struct file
* file
, char __user
* buf
,
2488 size_t count
, loff_t
*ppos
)
2490 struct inode
* inode
= file_inode(file
);
2493 struct task_struct
*task
= get_proc_task(inode
);
2498 length
= security_getprocattr(task
,
2499 (char*)file
->f_path
.dentry
->d_name
.name
,
2501 put_task_struct(task
);
2503 length
= simple_read_from_buffer(buf
, count
, ppos
, p
, length
);
2508 static ssize_t
proc_pid_attr_write(struct file
* file
, const char __user
* buf
,
2509 size_t count
, loff_t
*ppos
)
2511 struct inode
* inode
= file_inode(file
);
2514 struct task_struct
*task
= get_proc_task(inode
);
2520 /* A task may only write its own attributes. */
2522 if (current
!= task
)
2525 if (count
> PAGE_SIZE
)
2528 /* No partial writes. */
2533 page
= memdup_user(buf
, count
);
2535 length
= PTR_ERR(page
);
2539 /* Guard against adverse ptrace interaction */
2540 length
= mutex_lock_interruptible(¤t
->signal
->cred_guard_mutex
);
2544 length
= security_setprocattr(file
->f_path
.dentry
->d_name
.name
,
2546 mutex_unlock(¤t
->signal
->cred_guard_mutex
);
2550 put_task_struct(task
);
2555 static const struct file_operations proc_pid_attr_operations
= {
2556 .read
= proc_pid_attr_read
,
2557 .write
= proc_pid_attr_write
,
2558 .llseek
= generic_file_llseek
,
2561 static const struct pid_entry attr_dir_stuff
[] = {
2562 REG("current", S_IRUGO
|S_IWUGO
, proc_pid_attr_operations
),
2563 REG("prev", S_IRUGO
, proc_pid_attr_operations
),
2564 REG("exec", S_IRUGO
|S_IWUGO
, proc_pid_attr_operations
),
2565 REG("fscreate", S_IRUGO
|S_IWUGO
, proc_pid_attr_operations
),
2566 REG("keycreate", S_IRUGO
|S_IWUGO
, proc_pid_attr_operations
),
2567 REG("sockcreate", S_IRUGO
|S_IWUGO
, proc_pid_attr_operations
),
2570 static int proc_attr_dir_readdir(struct file
*file
, struct dir_context
*ctx
)
2572 return proc_pident_readdir(file
, ctx
,
2573 attr_dir_stuff
, ARRAY_SIZE(attr_dir_stuff
));
2576 static const struct file_operations proc_attr_dir_operations
= {
2577 .read
= generic_read_dir
,
2578 .iterate_shared
= proc_attr_dir_readdir
,
2579 .llseek
= generic_file_llseek
,
2582 static struct dentry
*proc_attr_dir_lookup(struct inode
*dir
,
2583 struct dentry
*dentry
, unsigned int flags
)
2585 return proc_pident_lookup(dir
, dentry
,
2586 attr_dir_stuff
, ARRAY_SIZE(attr_dir_stuff
));
2589 static const struct inode_operations proc_attr_dir_inode_operations
= {
2590 .lookup
= proc_attr_dir_lookup
,
2591 .getattr
= pid_getattr
,
2592 .setattr
= proc_setattr
,
2597 #ifdef CONFIG_ELF_CORE
2598 static ssize_t
proc_coredump_filter_read(struct file
*file
, char __user
*buf
,
2599 size_t count
, loff_t
*ppos
)
2601 struct task_struct
*task
= get_proc_task(file_inode(file
));
2602 struct mm_struct
*mm
;
2603 char buffer
[PROC_NUMBUF
];
2611 mm
= get_task_mm(task
);
2613 len
= snprintf(buffer
, sizeof(buffer
), "%08lx\n",
2614 ((mm
->flags
& MMF_DUMP_FILTER_MASK
) >>
2615 MMF_DUMP_FILTER_SHIFT
));
2617 ret
= simple_read_from_buffer(buf
, count
, ppos
, buffer
, len
);
2620 put_task_struct(task
);
2625 static ssize_t
proc_coredump_filter_write(struct file
*file
,
2626 const char __user
*buf
,
2630 struct task_struct
*task
;
2631 struct mm_struct
*mm
;
2637 ret
= kstrtouint_from_user(buf
, count
, 0, &val
);
2642 task
= get_proc_task(file_inode(file
));
2646 mm
= get_task_mm(task
);
2651 for (i
= 0, mask
= 1; i
< MMF_DUMP_FILTER_BITS
; i
++, mask
<<= 1) {
2653 set_bit(i
+ MMF_DUMP_FILTER_SHIFT
, &mm
->flags
);
2655 clear_bit(i
+ MMF_DUMP_FILTER_SHIFT
, &mm
->flags
);
2660 put_task_struct(task
);
2667 static const struct file_operations proc_coredump_filter_operations
= {
2668 .read
= proc_coredump_filter_read
,
2669 .write
= proc_coredump_filter_write
,
2670 .llseek
= generic_file_llseek
,
2674 #ifdef CONFIG_TASK_IO_ACCOUNTING
2675 static int do_io_accounting(struct task_struct
*task
, struct seq_file
*m
, int whole
)
2677 struct task_io_accounting acct
= task
->ioac
;
2678 unsigned long flags
;
2681 result
= mutex_lock_killable(&task
->signal
->cred_guard_mutex
);
2685 if (!ptrace_may_access(task
, PTRACE_MODE_READ_FSCREDS
)) {
2690 if (whole
&& lock_task_sighand(task
, &flags
)) {
2691 struct task_struct
*t
= task
;
2693 task_io_accounting_add(&acct
, &task
->signal
->ioac
);
2694 while_each_thread(task
, t
)
2695 task_io_accounting_add(&acct
, &t
->ioac
);
2697 unlock_task_sighand(task
, &flags
);
2704 "read_bytes: %llu\n"
2705 "write_bytes: %llu\n"
2706 "cancelled_write_bytes: %llu\n",
2707 (unsigned long long)acct
.rchar
,
2708 (unsigned long long)acct
.wchar
,
2709 (unsigned long long)acct
.syscr
,
2710 (unsigned long long)acct
.syscw
,
2711 (unsigned long long)acct
.read_bytes
,
2712 (unsigned long long)acct
.write_bytes
,
2713 (unsigned long long)acct
.cancelled_write_bytes
);
2717 mutex_unlock(&task
->signal
->cred_guard_mutex
);
2721 static int proc_tid_io_accounting(struct seq_file
*m
, struct pid_namespace
*ns
,
2722 struct pid
*pid
, struct task_struct
*task
)
2724 return do_io_accounting(task
, m
, 0);
2727 static int proc_tgid_io_accounting(struct seq_file
*m
, struct pid_namespace
*ns
,
2728 struct pid
*pid
, struct task_struct
*task
)
2730 return do_io_accounting(task
, m
, 1);
2732 #endif /* CONFIG_TASK_IO_ACCOUNTING */
2734 #ifdef CONFIG_USER_NS
2735 static int proc_id_map_open(struct inode
*inode
, struct file
*file
,
2736 const struct seq_operations
*seq_ops
)
2738 struct user_namespace
*ns
= NULL
;
2739 struct task_struct
*task
;
2740 struct seq_file
*seq
;
2743 task
= get_proc_task(inode
);
2746 ns
= get_user_ns(task_cred_xxx(task
, user_ns
));
2748 put_task_struct(task
);
2753 ret
= seq_open(file
, seq_ops
);
2757 seq
= file
->private_data
;
2767 static int proc_id_map_release(struct inode
*inode
, struct file
*file
)
2769 struct seq_file
*seq
= file
->private_data
;
2770 struct user_namespace
*ns
= seq
->private;
2772 return seq_release(inode
, file
);
2775 static int proc_uid_map_open(struct inode
*inode
, struct file
*file
)
2777 return proc_id_map_open(inode
, file
, &proc_uid_seq_operations
);
2780 static int proc_gid_map_open(struct inode
*inode
, struct file
*file
)
2782 return proc_id_map_open(inode
, file
, &proc_gid_seq_operations
);
2785 static int proc_projid_map_open(struct inode
*inode
, struct file
*file
)
2787 return proc_id_map_open(inode
, file
, &proc_projid_seq_operations
);
2790 static const struct file_operations proc_uid_map_operations
= {
2791 .open
= proc_uid_map_open
,
2792 .write
= proc_uid_map_write
,
2794 .llseek
= seq_lseek
,
2795 .release
= proc_id_map_release
,
2798 static const struct file_operations proc_gid_map_operations
= {
2799 .open
= proc_gid_map_open
,
2800 .write
= proc_gid_map_write
,
2802 .llseek
= seq_lseek
,
2803 .release
= proc_id_map_release
,
2806 static const struct file_operations proc_projid_map_operations
= {
2807 .open
= proc_projid_map_open
,
2808 .write
= proc_projid_map_write
,
2810 .llseek
= seq_lseek
,
2811 .release
= proc_id_map_release
,
2814 static int proc_setgroups_open(struct inode
*inode
, struct file
*file
)
2816 struct user_namespace
*ns
= NULL
;
2817 struct task_struct
*task
;
2821 task
= get_proc_task(inode
);
2824 ns
= get_user_ns(task_cred_xxx(task
, user_ns
));
2826 put_task_struct(task
);
2831 if (file
->f_mode
& FMODE_WRITE
) {
2833 if (!ns_capable(ns
, CAP_SYS_ADMIN
))
2837 ret
= single_open(file
, &proc_setgroups_show
, ns
);
2848 static int proc_setgroups_release(struct inode
*inode
, struct file
*file
)
2850 struct seq_file
*seq
= file
->private_data
;
2851 struct user_namespace
*ns
= seq
->private;
2852 int ret
= single_release(inode
, file
);
2857 static const struct file_operations proc_setgroups_operations
= {
2858 .open
= proc_setgroups_open
,
2859 .write
= proc_setgroups_write
,
2861 .llseek
= seq_lseek
,
2862 .release
= proc_setgroups_release
,
2864 #endif /* CONFIG_USER_NS */
2866 static int proc_pid_personality(struct seq_file
*m
, struct pid_namespace
*ns
,
2867 struct pid
*pid
, struct task_struct
*task
)
2869 int err
= lock_trace(task
);
2871 seq_printf(m
, "%08x\n", task
->personality
);
2877 #ifdef CONFIG_LIVEPATCH
2878 static int proc_pid_patch_state(struct seq_file
*m
, struct pid_namespace
*ns
,
2879 struct pid
*pid
, struct task_struct
*task
)
2881 seq_printf(m
, "%d\n", task
->patch_state
);
2884 #endif /* CONFIG_LIVEPATCH */
2889 static const struct file_operations proc_task_operations
;
2890 static const struct inode_operations proc_task_inode_operations
;
2892 static const struct pid_entry tgid_base_stuff
[] = {
2893 DIR("task", S_IRUGO
|S_IXUGO
, proc_task_inode_operations
, proc_task_operations
),
2894 DIR("fd", S_IRUSR
|S_IXUSR
, proc_fd_inode_operations
, proc_fd_operations
),
2895 DIR("map_files", S_IRUSR
|S_IXUSR
, proc_map_files_inode_operations
, proc_map_files_operations
),
2896 DIR("fdinfo", S_IRUSR
|S_IXUSR
, proc_fdinfo_inode_operations
, proc_fdinfo_operations
),
2897 DIR("ns", S_IRUSR
|S_IXUGO
, proc_ns_dir_inode_operations
, proc_ns_dir_operations
),
2899 DIR("net", S_IRUGO
|S_IXUGO
, proc_net_inode_operations
, proc_net_operations
),
2901 REG("environ", S_IRUSR
, proc_environ_operations
),
2902 REG("auxv", S_IRUSR
, proc_auxv_operations
),
2903 ONE("status", S_IRUGO
, proc_pid_status
),
2904 ONE("personality", S_IRUSR
, proc_pid_personality
),
2905 ONE("limits", S_IRUGO
, proc_pid_limits
),
2906 #ifdef CONFIG_SCHED_DEBUG
2907 REG("sched", S_IRUGO
|S_IWUSR
, proc_pid_sched_operations
),
2909 #ifdef CONFIG_SCHED_AUTOGROUP
2910 REG("autogroup", S_IRUGO
|S_IWUSR
, proc_pid_sched_autogroup_operations
),
2912 REG("comm", S_IRUGO
|S_IWUSR
, proc_pid_set_comm_operations
),
2913 #ifdef CONFIG_HAVE_ARCH_TRACEHOOK
2914 ONE("syscall", S_IRUSR
, proc_pid_syscall
),
2916 REG("cmdline", S_IRUGO
, proc_pid_cmdline_ops
),
2917 ONE("stat", S_IRUGO
, proc_tgid_stat
),
2918 ONE("statm", S_IRUGO
, proc_pid_statm
),
2919 REG("maps", S_IRUGO
, proc_pid_maps_operations
),
2921 REG("numa_maps", S_IRUGO
, proc_pid_numa_maps_operations
),
2923 REG("mem", S_IRUSR
|S_IWUSR
, proc_mem_operations
),
2924 LNK("cwd", proc_cwd_link
),
2925 LNK("root", proc_root_link
),
2926 LNK("exe", proc_exe_link
),
2927 REG("mounts", S_IRUGO
, proc_mounts_operations
),
2928 REG("mountinfo", S_IRUGO
, proc_mountinfo_operations
),
2929 REG("mountstats", S_IRUSR
, proc_mountstats_operations
),
2930 #ifdef CONFIG_PROC_PAGE_MONITOR
2931 REG("clear_refs", S_IWUSR
, proc_clear_refs_operations
),
2932 REG("smaps", S_IRUGO
, proc_pid_smaps_operations
),
2933 REG("pagemap", S_IRUSR
, proc_pagemap_operations
),
2935 #ifdef CONFIG_SECURITY
2936 DIR("attr", S_IRUGO
|S_IXUGO
, proc_attr_dir_inode_operations
, proc_attr_dir_operations
),
2938 #ifdef CONFIG_KALLSYMS
2939 ONE("wchan", S_IRUGO
, proc_pid_wchan
),
2941 #ifdef CONFIG_STACKTRACE
2942 ONE("stack", S_IRUSR
, proc_pid_stack
),
2944 #ifdef CONFIG_SCHED_INFO
2945 ONE("schedstat", S_IRUGO
, proc_pid_schedstat
),
2947 #ifdef CONFIG_LATENCYTOP
2948 REG("latency", S_IRUGO
, proc_lstats_operations
),
2950 #ifdef CONFIG_PROC_PID_CPUSET
2951 ONE("cpuset", S_IRUGO
, proc_cpuset_show
),
2953 #ifdef CONFIG_CGROUPS
2954 ONE("cgroup", S_IRUGO
, proc_cgroup_show
),
2956 ONE("oom_score", S_IRUGO
, proc_oom_score
),
2957 REG("oom_adj", S_IRUGO
|S_IWUSR
, proc_oom_adj_operations
),
2958 REG("oom_score_adj", S_IRUGO
|S_IWUSR
, proc_oom_score_adj_operations
),
2959 #ifdef CONFIG_AUDITSYSCALL
2960 REG("loginuid", S_IWUSR
|S_IRUGO
, proc_loginuid_operations
),
2961 REG("sessionid", S_IRUGO
, proc_sessionid_operations
),
2963 #ifdef CONFIG_FAULT_INJECTION
2964 REG("make-it-fail", S_IRUGO
|S_IWUSR
, proc_fault_inject_operations
),
2965 REG("fail-nth", 0644, proc_fail_nth_operations
),
2967 #ifdef CONFIG_ELF_CORE
2968 REG("coredump_filter", S_IRUGO
|S_IWUSR
, proc_coredump_filter_operations
),
2970 #ifdef CONFIG_TASK_IO_ACCOUNTING
2971 ONE("io", S_IRUSR
, proc_tgid_io_accounting
),
2973 #ifdef CONFIG_HARDWALL
2974 ONE("hardwall", S_IRUGO
, proc_pid_hardwall
),
2976 #ifdef CONFIG_USER_NS
2977 REG("uid_map", S_IRUGO
|S_IWUSR
, proc_uid_map_operations
),
2978 REG("gid_map", S_IRUGO
|S_IWUSR
, proc_gid_map_operations
),
2979 REG("projid_map", S_IRUGO
|S_IWUSR
, proc_projid_map_operations
),
2980 REG("setgroups", S_IRUGO
|S_IWUSR
, proc_setgroups_operations
),
2982 #if defined(CONFIG_CHECKPOINT_RESTORE) && defined(CONFIG_POSIX_TIMERS)
2983 REG("timers", S_IRUGO
, proc_timers_operations
),
2985 REG("timerslack_ns", S_IRUGO
|S_IWUGO
, proc_pid_set_timerslack_ns_operations
),
2986 #ifdef CONFIG_LIVEPATCH
2987 ONE("patch_state", S_IRUSR
, proc_pid_patch_state
),
2991 static int proc_tgid_base_readdir(struct file
*file
, struct dir_context
*ctx
)
2993 return proc_pident_readdir(file
, ctx
,
2994 tgid_base_stuff
, ARRAY_SIZE(tgid_base_stuff
));
2997 static const struct file_operations proc_tgid_base_operations
= {
2998 .read
= generic_read_dir
,
2999 .iterate_shared
= proc_tgid_base_readdir
,
3000 .llseek
= generic_file_llseek
,
3003 static struct dentry
*proc_tgid_base_lookup(struct inode
*dir
, struct dentry
*dentry
, unsigned int flags
)
3005 return proc_pident_lookup(dir
, dentry
,
3006 tgid_base_stuff
, ARRAY_SIZE(tgid_base_stuff
));
3009 static const struct inode_operations proc_tgid_base_inode_operations
= {
3010 .lookup
= proc_tgid_base_lookup
,
3011 .getattr
= pid_getattr
,
3012 .setattr
= proc_setattr
,
3013 .permission
= proc_pid_permission
,
3016 static void proc_flush_task_mnt(struct vfsmount
*mnt
, pid_t pid
, pid_t tgid
)
3018 struct dentry
*dentry
, *leader
, *dir
;
3019 char buf
[PROC_NUMBUF
];
3023 name
.len
= snprintf(buf
, sizeof(buf
), "%d", pid
);
3024 /* no ->d_hash() rejects on procfs */
3025 dentry
= d_hash_and_lookup(mnt
->mnt_root
, &name
);
3027 d_invalidate(dentry
);
3035 name
.len
= snprintf(buf
, sizeof(buf
), "%d", tgid
);
3036 leader
= d_hash_and_lookup(mnt
->mnt_root
, &name
);
3041 name
.len
= strlen(name
.name
);
3042 dir
= d_hash_and_lookup(leader
, &name
);
3044 goto out_put_leader
;
3047 name
.len
= snprintf(buf
, sizeof(buf
), "%d", pid
);
3048 dentry
= d_hash_and_lookup(dir
, &name
);
3050 d_invalidate(dentry
);
3062 * proc_flush_task - Remove dcache entries for @task from the /proc dcache.
3063 * @task: task that should be flushed.
3065 * When flushing dentries from proc, one needs to flush them from global
3066 * proc (proc_mnt) and from all the namespaces' procs this task was seen
3067 * in. This call is supposed to do all of this job.
3069 * Looks in the dcache for
3071 * /proc/@tgid/task/@pid
3072 * if either directory is present flushes it and all of it'ts children
3075 * It is safe and reasonable to cache /proc entries for a task until
3076 * that task exits. After that they just clog up the dcache with
3077 * useless entries, possibly causing useful dcache entries to be
3078 * flushed instead. This routine is proved to flush those useless
3079 * dcache entries at process exit time.
3081 * NOTE: This routine is just an optimization so it does not guarantee
3082 * that no dcache entries will exist at process exit time it
3083 * just makes it very unlikely that any will persist.
3086 void proc_flush_task(struct task_struct
*task
)
3089 struct pid
*pid
, *tgid
;
3092 pid
= task_pid(task
);
3093 tgid
= task_tgid(task
);
3095 for (i
= 0; i
<= pid
->level
; i
++) {
3096 upid
= &pid
->numbers
[i
];
3097 proc_flush_task_mnt(upid
->ns
->proc_mnt
, upid
->nr
,
3098 tgid
->numbers
[i
].nr
);
3102 static int proc_pid_instantiate(struct inode
*dir
,
3103 struct dentry
* dentry
,
3104 struct task_struct
*task
, const void *ptr
)
3106 struct inode
*inode
;
3108 inode
= proc_pid_make_inode(dir
->i_sb
, task
, S_IFDIR
| S_IRUGO
| S_IXUGO
);
3112 inode
->i_op
= &proc_tgid_base_inode_operations
;
3113 inode
->i_fop
= &proc_tgid_base_operations
;
3114 inode
->i_flags
|=S_IMMUTABLE
;
3116 set_nlink(inode
, nlink_tgid
);
3118 d_set_d_op(dentry
, &pid_dentry_operations
);
3120 d_add(dentry
, inode
);
3121 /* Close the race of the process dying before we return the dentry */
3122 if (pid_revalidate(dentry
, 0))
3128 struct dentry
*proc_pid_lookup(struct inode
*dir
, struct dentry
* dentry
, unsigned int flags
)
3130 int result
= -ENOENT
;
3131 struct task_struct
*task
;
3133 struct pid_namespace
*ns
;
3135 tgid
= name_to_int(&dentry
->d_name
);
3139 ns
= dentry
->d_sb
->s_fs_info
;
3141 task
= find_task_by_pid_ns(tgid
, ns
);
3143 get_task_struct(task
);
3148 result
= proc_pid_instantiate(dir
, dentry
, task
, NULL
);
3149 put_task_struct(task
);
3151 return ERR_PTR(result
);
3155 * Find the first task with tgid >= tgid
3160 struct task_struct
*task
;
3162 static struct tgid_iter
next_tgid(struct pid_namespace
*ns
, struct tgid_iter iter
)
3167 put_task_struct(iter
.task
);
3171 pid
= find_ge_pid(iter
.tgid
, ns
);
3173 iter
.tgid
= pid_nr_ns(pid
, ns
);
3174 iter
.task
= pid_task(pid
, PIDTYPE_PID
);
3175 /* What we to know is if the pid we have find is the
3176 * pid of a thread_group_leader. Testing for task
3177 * being a thread_group_leader is the obvious thing
3178 * todo but there is a window when it fails, due to
3179 * the pid transfer logic in de_thread.
3181 * So we perform the straight forward test of seeing
3182 * if the pid we have found is the pid of a thread
3183 * group leader, and don't worry if the task we have
3184 * found doesn't happen to be a thread group leader.
3185 * As we don't care in the case of readdir.
3187 if (!iter
.task
|| !has_group_leader_pid(iter
.task
)) {
3191 get_task_struct(iter
.task
);
3197 #define TGID_OFFSET (FIRST_PROCESS_ENTRY + 2)
3199 /* for the /proc/ directory itself, after non-process stuff has been done */
3200 int proc_pid_readdir(struct file
*file
, struct dir_context
*ctx
)
3202 struct tgid_iter iter
;
3203 struct pid_namespace
*ns
= file_inode(file
)->i_sb
->s_fs_info
;
3204 loff_t pos
= ctx
->pos
;
3206 if (pos
>= PID_MAX_LIMIT
+ TGID_OFFSET
)
3209 if (pos
== TGID_OFFSET
- 2) {
3210 struct inode
*inode
= d_inode(ns
->proc_self
);
3211 if (!dir_emit(ctx
, "self", 4, inode
->i_ino
, DT_LNK
))
3213 ctx
->pos
= pos
= pos
+ 1;
3215 if (pos
== TGID_OFFSET
- 1) {
3216 struct inode
*inode
= d_inode(ns
->proc_thread_self
);
3217 if (!dir_emit(ctx
, "thread-self", 11, inode
->i_ino
, DT_LNK
))
3219 ctx
->pos
= pos
= pos
+ 1;
3221 iter
.tgid
= pos
- TGID_OFFSET
;
3223 for (iter
= next_tgid(ns
, iter
);
3225 iter
.tgid
+= 1, iter
= next_tgid(ns
, iter
)) {
3226 char name
[PROC_NUMBUF
];
3230 if (!has_pid_permissions(ns
, iter
.task
, HIDEPID_INVISIBLE
))
3233 len
= snprintf(name
, sizeof(name
), "%d", iter
.tgid
);
3234 ctx
->pos
= iter
.tgid
+ TGID_OFFSET
;
3235 if (!proc_fill_cache(file
, ctx
, name
, len
,
3236 proc_pid_instantiate
, iter
.task
, NULL
)) {
3237 put_task_struct(iter
.task
);
3241 ctx
->pos
= PID_MAX_LIMIT
+ TGID_OFFSET
;
3246 * proc_tid_comm_permission is a special permission function exclusively
3247 * used for the node /proc/<pid>/task/<tid>/comm.
3248 * It bypasses generic permission checks in the case where a task of the same
3249 * task group attempts to access the node.
3250 * The rationale behind this is that glibc and bionic access this node for
3251 * cross thread naming (pthread_set/getname_np(!self)). However, if
3252 * PR_SET_DUMPABLE gets set to 0 this node among others becomes uid=0 gid=0,
3253 * which locks out the cross thread naming implementation.
3254 * This function makes sure that the node is always accessible for members of
3255 * same thread group.
3257 static int proc_tid_comm_permission(struct inode
*inode
, int mask
)
3259 bool is_same_tgroup
;
3260 struct task_struct
*task
;
3262 task
= get_proc_task(inode
);
3265 is_same_tgroup
= same_thread_group(current
, task
);
3266 put_task_struct(task
);
3268 if (likely(is_same_tgroup
&& !(mask
& MAY_EXEC
))) {
3269 /* This file (/proc/<pid>/task/<tid>/comm) can always be
3270 * read or written by the members of the corresponding
3276 return generic_permission(inode
, mask
);
3279 static const struct inode_operations proc_tid_comm_inode_operations
= {
3280 .permission
= proc_tid_comm_permission
,
3286 static const struct pid_entry tid_base_stuff
[] = {
3287 DIR("fd", S_IRUSR
|S_IXUSR
, proc_fd_inode_operations
, proc_fd_operations
),
3288 DIR("fdinfo", S_IRUSR
|S_IXUSR
, proc_fdinfo_inode_operations
, proc_fdinfo_operations
),
3289 DIR("ns", S_IRUSR
|S_IXUGO
, proc_ns_dir_inode_operations
, proc_ns_dir_operations
),
3291 DIR("net", S_IRUGO
|S_IXUGO
, proc_net_inode_operations
, proc_net_operations
),
3293 REG("environ", S_IRUSR
, proc_environ_operations
),
3294 REG("auxv", S_IRUSR
, proc_auxv_operations
),
3295 ONE("status", S_IRUGO
, proc_pid_status
),
3296 ONE("personality", S_IRUSR
, proc_pid_personality
),
3297 ONE("limits", S_IRUGO
, proc_pid_limits
),
3298 #ifdef CONFIG_SCHED_DEBUG
3299 REG("sched", S_IRUGO
|S_IWUSR
, proc_pid_sched_operations
),
3301 NOD("comm", S_IFREG
|S_IRUGO
|S_IWUSR
,
3302 &proc_tid_comm_inode_operations
,
3303 &proc_pid_set_comm_operations
, {}),
3304 #ifdef CONFIG_HAVE_ARCH_TRACEHOOK
3305 ONE("syscall", S_IRUSR
, proc_pid_syscall
),
3307 REG("cmdline", S_IRUGO
, proc_pid_cmdline_ops
),
3308 ONE("stat", S_IRUGO
, proc_tid_stat
),
3309 ONE("statm", S_IRUGO
, proc_pid_statm
),
3310 REG("maps", S_IRUGO
, proc_tid_maps_operations
),
3311 #ifdef CONFIG_PROC_CHILDREN
3312 REG("children", S_IRUGO
, proc_tid_children_operations
),
3315 REG("numa_maps", S_IRUGO
, proc_tid_numa_maps_operations
),
3317 REG("mem", S_IRUSR
|S_IWUSR
, proc_mem_operations
),
3318 LNK("cwd", proc_cwd_link
),
3319 LNK("root", proc_root_link
),
3320 LNK("exe", proc_exe_link
),
3321 REG("mounts", S_IRUGO
, proc_mounts_operations
),
3322 REG("mountinfo", S_IRUGO
, proc_mountinfo_operations
),
3323 #ifdef CONFIG_PROC_PAGE_MONITOR
3324 REG("clear_refs", S_IWUSR
, proc_clear_refs_operations
),
3325 REG("smaps", S_IRUGO
, proc_tid_smaps_operations
),
3326 REG("pagemap", S_IRUSR
, proc_pagemap_operations
),
3328 #ifdef CONFIG_SECURITY
3329 DIR("attr", S_IRUGO
|S_IXUGO
, proc_attr_dir_inode_operations
, proc_attr_dir_operations
),
3331 #ifdef CONFIG_KALLSYMS
3332 ONE("wchan", S_IRUGO
, proc_pid_wchan
),
3334 #ifdef CONFIG_STACKTRACE
3335 ONE("stack", S_IRUSR
, proc_pid_stack
),
3337 #ifdef CONFIG_SCHED_INFO
3338 ONE("schedstat", S_IRUGO
, proc_pid_schedstat
),
3340 #ifdef CONFIG_LATENCYTOP
3341 REG("latency", S_IRUGO
, proc_lstats_operations
),
3343 #ifdef CONFIG_PROC_PID_CPUSET
3344 ONE("cpuset", S_IRUGO
, proc_cpuset_show
),
3346 #ifdef CONFIG_CGROUPS
3347 ONE("cgroup", S_IRUGO
, proc_cgroup_show
),
3349 ONE("oom_score", S_IRUGO
, proc_oom_score
),
3350 REG("oom_adj", S_IRUGO
|S_IWUSR
, proc_oom_adj_operations
),
3351 REG("oom_score_adj", S_IRUGO
|S_IWUSR
, proc_oom_score_adj_operations
),
3352 #ifdef CONFIG_AUDITSYSCALL
3353 REG("loginuid", S_IWUSR
|S_IRUGO
, proc_loginuid_operations
),
3354 REG("sessionid", S_IRUGO
, proc_sessionid_operations
),
3356 #ifdef CONFIG_FAULT_INJECTION
3357 REG("make-it-fail", S_IRUGO
|S_IWUSR
, proc_fault_inject_operations
),
3358 REG("fail-nth", 0644, proc_fail_nth_operations
),
3360 #ifdef CONFIG_TASK_IO_ACCOUNTING
3361 ONE("io", S_IRUSR
, proc_tid_io_accounting
),
3363 #ifdef CONFIG_HARDWALL
3364 ONE("hardwall", S_IRUGO
, proc_pid_hardwall
),
3366 #ifdef CONFIG_USER_NS
3367 REG("uid_map", S_IRUGO
|S_IWUSR
, proc_uid_map_operations
),
3368 REG("gid_map", S_IRUGO
|S_IWUSR
, proc_gid_map_operations
),
3369 REG("projid_map", S_IRUGO
|S_IWUSR
, proc_projid_map_operations
),
3370 REG("setgroups", S_IRUGO
|S_IWUSR
, proc_setgroups_operations
),
3372 #ifdef CONFIG_LIVEPATCH
3373 ONE("patch_state", S_IRUSR
, proc_pid_patch_state
),
3377 static int proc_tid_base_readdir(struct file
*file
, struct dir_context
*ctx
)
3379 return proc_pident_readdir(file
, ctx
,
3380 tid_base_stuff
, ARRAY_SIZE(tid_base_stuff
));
3383 static struct dentry
*proc_tid_base_lookup(struct inode
*dir
, struct dentry
*dentry
, unsigned int flags
)
3385 return proc_pident_lookup(dir
, dentry
,
3386 tid_base_stuff
, ARRAY_SIZE(tid_base_stuff
));
3389 static const struct file_operations proc_tid_base_operations
= {
3390 .read
= generic_read_dir
,
3391 .iterate_shared
= proc_tid_base_readdir
,
3392 .llseek
= generic_file_llseek
,
3395 static const struct inode_operations proc_tid_base_inode_operations
= {
3396 .lookup
= proc_tid_base_lookup
,
3397 .getattr
= pid_getattr
,
3398 .setattr
= proc_setattr
,
3401 static int proc_task_instantiate(struct inode
*dir
,
3402 struct dentry
*dentry
, struct task_struct
*task
, const void *ptr
)
3404 struct inode
*inode
;
3405 inode
= proc_pid_make_inode(dir
->i_sb
, task
, S_IFDIR
| S_IRUGO
| S_IXUGO
);
3409 inode
->i_op
= &proc_tid_base_inode_operations
;
3410 inode
->i_fop
= &proc_tid_base_operations
;
3411 inode
->i_flags
|=S_IMMUTABLE
;
3413 set_nlink(inode
, nlink_tid
);
3415 d_set_d_op(dentry
, &pid_dentry_operations
);
3417 d_add(dentry
, inode
);
3418 /* Close the race of the process dying before we return the dentry */
3419 if (pid_revalidate(dentry
, 0))
3425 static struct dentry
*proc_task_lookup(struct inode
*dir
, struct dentry
* dentry
, unsigned int flags
)
3427 int result
= -ENOENT
;
3428 struct task_struct
*task
;
3429 struct task_struct
*leader
= get_proc_task(dir
);
3431 struct pid_namespace
*ns
;
3436 tid
= name_to_int(&dentry
->d_name
);
3440 ns
= dentry
->d_sb
->s_fs_info
;
3442 task
= find_task_by_pid_ns(tid
, ns
);
3444 get_task_struct(task
);
3448 if (!same_thread_group(leader
, task
))
3451 result
= proc_task_instantiate(dir
, dentry
, task
, NULL
);
3453 put_task_struct(task
);
3455 put_task_struct(leader
);
3457 return ERR_PTR(result
);
3461 * Find the first tid of a thread group to return to user space.
3463 * Usually this is just the thread group leader, but if the users
3464 * buffer was too small or there was a seek into the middle of the
3465 * directory we have more work todo.
3467 * In the case of a short read we start with find_task_by_pid.
3469 * In the case of a seek we start with the leader and walk nr
3472 static struct task_struct
*first_tid(struct pid
*pid
, int tid
, loff_t f_pos
,
3473 struct pid_namespace
*ns
)
3475 struct task_struct
*pos
, *task
;
3476 unsigned long nr
= f_pos
;
3478 if (nr
!= f_pos
) /* 32bit overflow? */
3482 task
= pid_task(pid
, PIDTYPE_PID
);
3486 /* Attempt to start with the tid of a thread */
3488 pos
= find_task_by_pid_ns(tid
, ns
);
3489 if (pos
&& same_thread_group(pos
, task
))
3493 /* If nr exceeds the number of threads there is nothing todo */
3494 if (nr
>= get_nr_threads(task
))
3497 /* If we haven't found our starting place yet start
3498 * with the leader and walk nr threads forward.
3500 pos
= task
= task
->group_leader
;
3504 } while_each_thread(task
, pos
);
3509 get_task_struct(pos
);
3516 * Find the next thread in the thread list.
3517 * Return NULL if there is an error or no next thread.
3519 * The reference to the input task_struct is released.
3521 static struct task_struct
*next_tid(struct task_struct
*start
)
3523 struct task_struct
*pos
= NULL
;
3525 if (pid_alive(start
)) {
3526 pos
= next_thread(start
);
3527 if (thread_group_leader(pos
))
3530 get_task_struct(pos
);
3533 put_task_struct(start
);
3537 /* for the /proc/TGID/task/ directories */
3538 static int proc_task_readdir(struct file
*file
, struct dir_context
*ctx
)
3540 struct inode
*inode
= file_inode(file
);
3541 struct task_struct
*task
;
3542 struct pid_namespace
*ns
;
3545 if (proc_inode_is_dead(inode
))
3548 if (!dir_emit_dots(file
, ctx
))
3551 /* f_version caches the tgid value that the last readdir call couldn't
3552 * return. lseek aka telldir automagically resets f_version to 0.
3554 ns
= inode
->i_sb
->s_fs_info
;
3555 tid
= (int)file
->f_version
;
3556 file
->f_version
= 0;
3557 for (task
= first_tid(proc_pid(inode
), tid
, ctx
->pos
- 2, ns
);
3559 task
= next_tid(task
), ctx
->pos
++) {
3560 char name
[PROC_NUMBUF
];
3562 tid
= task_pid_nr_ns(task
, ns
);
3563 len
= snprintf(name
, sizeof(name
), "%d", tid
);
3564 if (!proc_fill_cache(file
, ctx
, name
, len
,
3565 proc_task_instantiate
, task
, NULL
)) {
3566 /* returning this tgid failed, save it as the first
3567 * pid for the next readir call */
3568 file
->f_version
= (u64
)tid
;
3569 put_task_struct(task
);
3577 static int proc_task_getattr(const struct path
*path
, struct kstat
*stat
,
3578 u32 request_mask
, unsigned int query_flags
)
3580 struct inode
*inode
= d_inode(path
->dentry
);
3581 struct task_struct
*p
= get_proc_task(inode
);
3582 generic_fillattr(inode
, stat
);
3585 stat
->nlink
+= get_nr_threads(p
);
3592 static const struct inode_operations proc_task_inode_operations
= {
3593 .lookup
= proc_task_lookup
,
3594 .getattr
= proc_task_getattr
,
3595 .setattr
= proc_setattr
,
3596 .permission
= proc_pid_permission
,
3599 static const struct file_operations proc_task_operations
= {
3600 .read
= generic_read_dir
,
3601 .iterate_shared
= proc_task_readdir
,
3602 .llseek
= generic_file_llseek
,
3605 void __init
set_proc_pid_nlink(void)
3607 nlink_tid
= pid_entry_nlink(tid_base_stuff
, ARRAY_SIZE(tid_base_stuff
));
3608 nlink_tgid
= pid_entry_nlink(tgid_base_stuff
, ARRAY_SIZE(tgid_base_stuff
));