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/flex_array.h>
89 #include <linux/posix-timers.h>
90 #ifdef CONFIG_HARDWALL
91 #include <asm/hardwall.h>
93 #include <trace/events/oom.h>
98 * Implementing inode permission operations in /proc is almost
99 * certainly an error. Permission checks need to happen during
100 * each system call not at open time. The reason is that most of
101 * what we wish to check for permissions in /proc varies at runtime.
103 * The classic example of a problem is opening file descriptors
104 * in /proc for a task before it execs a suid executable.
108 static u8 nlink_tgid
;
114 const struct inode_operations
*iop
;
115 const struct file_operations
*fop
;
119 #define NOD(NAME, MODE, IOP, FOP, OP) { \
121 .len = sizeof(NAME) - 1, \
128 #define DIR(NAME, MODE, iops, fops) \
129 NOD(NAME, (S_IFDIR|(MODE)), &iops, &fops, {} )
130 #define LNK(NAME, get_link) \
131 NOD(NAME, (S_IFLNK|S_IRWXUGO), \
132 &proc_pid_link_inode_operations, NULL, \
133 { .proc_get_link = get_link } )
134 #define REG(NAME, MODE, fops) \
135 NOD(NAME, (S_IFREG|(MODE)), NULL, &fops, {})
136 #define ONE(NAME, MODE, show) \
137 NOD(NAME, (S_IFREG|(MODE)), \
138 NULL, &proc_single_file_operations, \
139 { .proc_show = show } )
142 * Count the number of hardlinks for the pid_entry table, excluding the .
145 static unsigned int __init
pid_entry_nlink(const struct pid_entry
*entries
,
152 for (i
= 0; i
< n
; ++i
) {
153 if (S_ISDIR(entries
[i
].mode
))
160 static int get_task_root(struct task_struct
*task
, struct path
*root
)
162 int result
= -ENOENT
;
166 get_fs_root(task
->fs
, root
);
173 static int proc_cwd_link(struct dentry
*dentry
, struct path
*path
)
175 struct task_struct
*task
= get_proc_task(d_inode(dentry
));
176 int result
= -ENOENT
;
181 get_fs_pwd(task
->fs
, path
);
185 put_task_struct(task
);
190 static int proc_root_link(struct dentry
*dentry
, struct path
*path
)
192 struct task_struct
*task
= get_proc_task(d_inode(dentry
));
193 int result
= -ENOENT
;
196 result
= get_task_root(task
, path
);
197 put_task_struct(task
);
202 static ssize_t
proc_pid_cmdline_read(struct file
*file
, char __user
*buf
,
203 size_t _count
, loff_t
*pos
)
205 struct task_struct
*tsk
;
206 struct mm_struct
*mm
;
208 unsigned long count
= _count
;
209 unsigned long arg_start
, arg_end
, env_start
, env_end
;
210 unsigned long len1
, len2
, len
;
217 tsk
= get_proc_task(file_inode(file
));
220 mm
= get_task_mm(tsk
);
221 put_task_struct(tsk
);
224 /* Check if process spawned far enough to have cmdline. */
230 page
= (char *)__get_free_page(GFP_TEMPORARY
);
236 down_read(&mm
->mmap_sem
);
237 arg_start
= mm
->arg_start
;
238 arg_end
= mm
->arg_end
;
239 env_start
= mm
->env_start
;
240 env_end
= mm
->env_end
;
241 up_read(&mm
->mmap_sem
);
243 BUG_ON(arg_start
> arg_end
);
244 BUG_ON(env_start
> env_end
);
246 len1
= arg_end
- arg_start
;
247 len2
= env_end
- env_start
;
255 * Inherently racy -- command line shares address space
256 * with code and data.
258 rv
= access_remote_vm(mm
, arg_end
- 1, &c
, 1, 0);
265 /* Command line (set of strings) occupies whole ARGV. */
269 p
= arg_start
+ *pos
;
271 while (count
> 0 && len
> 0) {
275 _count
= min3(count
, len
, PAGE_SIZE
);
276 nr_read
= access_remote_vm(mm
, p
, page
, _count
, 0);
282 if (copy_to_user(buf
, page
, nr_read
)) {
295 * Command line (1 string) occupies ARGV and
302 { .p
= arg_start
, .len
= len1
},
303 { .p
= env_start
, .len
= len2
},
309 while (i
< 2 && pos1
>= cmdline
[i
].len
) {
310 pos1
-= cmdline
[i
].len
;
314 p
= cmdline
[i
].p
+ pos1
;
315 len
= cmdline
[i
].len
- pos1
;
316 while (count
> 0 && len
> 0) {
317 unsigned int _count
, l
;
321 _count
= min3(count
, len
, PAGE_SIZE
);
322 nr_read
= access_remote_vm(mm
, p
, page
, _count
, 0);
329 * Command line can be shorter than whole ARGV
330 * even if last "marker" byte says it is not.
333 l
= strnlen(page
, nr_read
);
339 if (copy_to_user(buf
, page
, nr_read
)) {
354 /* Only first chunk can be read partially. */
361 free_page((unsigned long)page
);
369 static const struct file_operations proc_pid_cmdline_ops
= {
370 .read
= proc_pid_cmdline_read
,
371 .llseek
= generic_file_llseek
,
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 seq_file
*m
, struct pid_namespace
*ns
,
380 struct pid
*pid
, struct task_struct
*task
)
383 char symname
[KSYM_NAME_LEN
];
385 wchan
= get_wchan(task
);
387 if (wchan
&& ptrace_may_access(task
, PTRACE_MODE_READ_FSCREDS
)
388 && !lookup_symbol_name(wchan
, symname
))
389 seq_printf(m
, "%s", symname
);
395 #endif /* CONFIG_KALLSYMS */
397 static int lock_trace(struct task_struct
*task
)
399 int err
= mutex_lock_killable(&task
->signal
->cred_guard_mutex
);
402 if (!ptrace_may_access(task
, PTRACE_MODE_ATTACH_FSCREDS
)) {
403 mutex_unlock(&task
->signal
->cred_guard_mutex
);
409 static void unlock_trace(struct task_struct
*task
)
411 mutex_unlock(&task
->signal
->cred_guard_mutex
);
414 #ifdef CONFIG_STACKTRACE
416 #define MAX_STACK_TRACE_DEPTH 64
418 static int proc_pid_stack(struct seq_file
*m
, struct pid_namespace
*ns
,
419 struct pid
*pid
, struct task_struct
*task
)
421 struct stack_trace trace
;
422 unsigned long *entries
;
426 entries
= kmalloc(MAX_STACK_TRACE_DEPTH
* sizeof(*entries
), GFP_KERNEL
);
430 trace
.nr_entries
= 0;
431 trace
.max_entries
= MAX_STACK_TRACE_DEPTH
;
432 trace
.entries
= entries
;
435 err
= lock_trace(task
);
437 save_stack_trace_tsk(task
, &trace
);
439 for (i
= 0; i
< trace
.nr_entries
; i
++) {
440 seq_printf(m
, "[<%pK>] %pB\n",
441 (void *)entries
[i
], (void *)entries
[i
]);
451 #ifdef CONFIG_SCHED_INFO
453 * Provides /proc/PID/schedstat
455 static int proc_pid_schedstat(struct seq_file
*m
, struct pid_namespace
*ns
,
456 struct pid
*pid
, struct task_struct
*task
)
458 if (unlikely(!sched_info_on()))
459 seq_printf(m
, "0 0 0\n");
461 seq_printf(m
, "%llu %llu %lu\n",
462 (unsigned long long)task
->se
.sum_exec_runtime
,
463 (unsigned long long)task
->sched_info
.run_delay
,
464 task
->sched_info
.pcount
);
470 #ifdef CONFIG_LATENCYTOP
471 static int lstats_show_proc(struct seq_file
*m
, void *v
)
474 struct inode
*inode
= m
->private;
475 struct task_struct
*task
= get_proc_task(inode
);
479 seq_puts(m
, "Latency Top version : v0.1\n");
480 for (i
= 0; i
< 32; i
++) {
481 struct latency_record
*lr
= &task
->latency_record
[i
];
482 if (lr
->backtrace
[0]) {
484 seq_printf(m
, "%i %li %li",
485 lr
->count
, lr
->time
, lr
->max
);
486 for (q
= 0; q
< LT_BACKTRACEDEPTH
; q
++) {
487 unsigned long bt
= lr
->backtrace
[q
];
492 seq_printf(m
, " %ps", (void *)bt
);
498 put_task_struct(task
);
502 static int lstats_open(struct inode
*inode
, struct file
*file
)
504 return single_open(file
, lstats_show_proc
, inode
);
507 static ssize_t
lstats_write(struct file
*file
, const char __user
*buf
,
508 size_t count
, loff_t
*offs
)
510 struct task_struct
*task
= get_proc_task(file_inode(file
));
514 clear_all_latency_tracing(task
);
515 put_task_struct(task
);
520 static const struct file_operations proc_lstats_operations
= {
523 .write
= lstats_write
,
525 .release
= single_release
,
530 static int proc_oom_score(struct seq_file
*m
, struct pid_namespace
*ns
,
531 struct pid
*pid
, struct task_struct
*task
)
533 unsigned long totalpages
= totalram_pages
+ total_swap_pages
;
534 unsigned long points
= 0;
536 points
= oom_badness(task
, NULL
, NULL
, totalpages
) *
538 seq_printf(m
, "%lu\n", points
);
548 static const struct limit_names lnames
[RLIM_NLIMITS
] = {
549 [RLIMIT_CPU
] = {"Max cpu time", "seconds"},
550 [RLIMIT_FSIZE
] = {"Max file size", "bytes"},
551 [RLIMIT_DATA
] = {"Max data size", "bytes"},
552 [RLIMIT_STACK
] = {"Max stack size", "bytes"},
553 [RLIMIT_CORE
] = {"Max core file size", "bytes"},
554 [RLIMIT_RSS
] = {"Max resident set", "bytes"},
555 [RLIMIT_NPROC
] = {"Max processes", "processes"},
556 [RLIMIT_NOFILE
] = {"Max open files", "files"},
557 [RLIMIT_MEMLOCK
] = {"Max locked memory", "bytes"},
558 [RLIMIT_AS
] = {"Max address space", "bytes"},
559 [RLIMIT_LOCKS
] = {"Max file locks", "locks"},
560 [RLIMIT_SIGPENDING
] = {"Max pending signals", "signals"},
561 [RLIMIT_MSGQUEUE
] = {"Max msgqueue size", "bytes"},
562 [RLIMIT_NICE
] = {"Max nice priority", NULL
},
563 [RLIMIT_RTPRIO
] = {"Max realtime priority", NULL
},
564 [RLIMIT_RTTIME
] = {"Max realtime timeout", "us"},
567 /* Display limits for a process */
568 static int proc_pid_limits(struct seq_file
*m
, struct pid_namespace
*ns
,
569 struct pid
*pid
, struct task_struct
*task
)
574 struct rlimit rlim
[RLIM_NLIMITS
];
576 if (!lock_task_sighand(task
, &flags
))
578 memcpy(rlim
, task
->signal
->rlim
, sizeof(struct rlimit
) * RLIM_NLIMITS
);
579 unlock_task_sighand(task
, &flags
);
582 * print the file header
584 seq_printf(m
, "%-25s %-20s %-20s %-10s\n",
585 "Limit", "Soft Limit", "Hard Limit", "Units");
587 for (i
= 0; i
< RLIM_NLIMITS
; i
++) {
588 if (rlim
[i
].rlim_cur
== RLIM_INFINITY
)
589 seq_printf(m
, "%-25s %-20s ",
590 lnames
[i
].name
, "unlimited");
592 seq_printf(m
, "%-25s %-20lu ",
593 lnames
[i
].name
, rlim
[i
].rlim_cur
);
595 if (rlim
[i
].rlim_max
== RLIM_INFINITY
)
596 seq_printf(m
, "%-20s ", "unlimited");
598 seq_printf(m
, "%-20lu ", rlim
[i
].rlim_max
);
601 seq_printf(m
, "%-10s\n", lnames
[i
].unit
);
609 #ifdef CONFIG_HAVE_ARCH_TRACEHOOK
610 static int proc_pid_syscall(struct seq_file
*m
, struct pid_namespace
*ns
,
611 struct pid
*pid
, struct task_struct
*task
)
614 unsigned long args
[6], sp
, pc
;
617 res
= lock_trace(task
);
621 if (task_current_syscall(task
, &nr
, args
, 6, &sp
, &pc
))
622 seq_puts(m
, "running\n");
624 seq_printf(m
, "%ld 0x%lx 0x%lx\n", nr
, sp
, pc
);
627 "%ld 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx\n",
629 args
[0], args
[1], args
[2], args
[3], args
[4], args
[5],
635 #endif /* CONFIG_HAVE_ARCH_TRACEHOOK */
637 /************************************************************************/
638 /* Here the fs part begins */
639 /************************************************************************/
641 /* permission checks */
642 static int proc_fd_access_allowed(struct inode
*inode
)
644 struct task_struct
*task
;
646 /* Allow access to a task's file descriptors if it is us or we
647 * may use ptrace attach to the process and find out that
650 task
= get_proc_task(inode
);
652 allowed
= ptrace_may_access(task
, PTRACE_MODE_READ_FSCREDS
);
653 put_task_struct(task
);
658 int proc_setattr(struct dentry
*dentry
, struct iattr
*attr
)
661 struct inode
*inode
= d_inode(dentry
);
663 if (attr
->ia_valid
& ATTR_MODE
)
666 error
= setattr_prepare(dentry
, attr
);
670 setattr_copy(inode
, attr
);
671 mark_inode_dirty(inode
);
676 * May current process learn task's sched/cmdline info (for hide_pid_min=1)
677 * or euid/egid (for hide_pid_min=2)?
679 static bool has_pid_permissions(struct pid_namespace
*pid
,
680 struct task_struct
*task
,
683 if (pid
->hide_pid
< hide_pid_min
)
685 if (in_group_p(pid
->pid_gid
))
687 return ptrace_may_access(task
, PTRACE_MODE_READ_FSCREDS
);
691 static int proc_pid_permission(struct inode
*inode
, int mask
)
693 struct pid_namespace
*pid
= inode
->i_sb
->s_fs_info
;
694 struct task_struct
*task
;
697 task
= get_proc_task(inode
);
700 has_perms
= has_pid_permissions(pid
, task
, HIDEPID_NO_ACCESS
);
701 put_task_struct(task
);
704 if (pid
->hide_pid
== HIDEPID_INVISIBLE
) {
706 * Let's make getdents(), stat(), and open()
707 * consistent with each other. If a process
708 * may not stat() a file, it shouldn't be seen
716 return generic_permission(inode
, mask
);
721 static const struct inode_operations proc_def_inode_operations
= {
722 .setattr
= proc_setattr
,
725 static int proc_single_show(struct seq_file
*m
, void *v
)
727 struct inode
*inode
= m
->private;
728 struct pid_namespace
*ns
;
730 struct task_struct
*task
;
733 ns
= inode
->i_sb
->s_fs_info
;
734 pid
= proc_pid(inode
);
735 task
= get_pid_task(pid
, PIDTYPE_PID
);
739 ret
= PROC_I(inode
)->op
.proc_show(m
, ns
, pid
, task
);
741 put_task_struct(task
);
745 static int proc_single_open(struct inode
*inode
, struct file
*filp
)
747 return single_open(filp
, proc_single_show
, inode
);
750 static const struct file_operations proc_single_file_operations
= {
751 .open
= proc_single_open
,
754 .release
= single_release
,
758 struct mm_struct
*proc_mem_open(struct inode
*inode
, unsigned int mode
)
760 struct task_struct
*task
= get_proc_task(inode
);
761 struct mm_struct
*mm
= ERR_PTR(-ESRCH
);
764 mm
= mm_access(task
, mode
| PTRACE_MODE_FSCREDS
);
765 put_task_struct(task
);
767 if (!IS_ERR_OR_NULL(mm
)) {
768 /* ensure this mm_struct can't be freed */
770 /* but do not pin its memory */
778 static int __mem_open(struct inode
*inode
, struct file
*file
, unsigned int mode
)
780 struct mm_struct
*mm
= proc_mem_open(inode
, mode
);
785 file
->private_data
= mm
;
789 static int mem_open(struct inode
*inode
, struct file
*file
)
791 int ret
= __mem_open(inode
, file
, PTRACE_MODE_ATTACH
);
793 /* OK to pass negative loff_t, we can catch out-of-range */
794 file
->f_mode
|= FMODE_UNSIGNED_OFFSET
;
799 static ssize_t
mem_rw(struct file
*file
, char __user
*buf
,
800 size_t count
, loff_t
*ppos
, int write
)
802 struct mm_struct
*mm
= file
->private_data
;
803 unsigned long addr
= *ppos
;
811 page
= (char *)__get_free_page(GFP_TEMPORARY
);
816 if (!atomic_inc_not_zero(&mm
->mm_users
))
819 /* Maybe we should limit FOLL_FORCE to actual ptrace users? */
825 int this_len
= min_t(int, count
, PAGE_SIZE
);
827 if (write
&& copy_from_user(page
, buf
, this_len
)) {
832 this_len
= access_remote_vm(mm
, addr
, page
, this_len
, flags
);
839 if (!write
&& copy_to_user(buf
, page
, this_len
)) {
853 free_page((unsigned long) page
);
857 static ssize_t
mem_read(struct file
*file
, char __user
*buf
,
858 size_t count
, loff_t
*ppos
)
860 return mem_rw(file
, buf
, count
, ppos
, 0);
863 static ssize_t
mem_write(struct file
*file
, const char __user
*buf
,
864 size_t count
, loff_t
*ppos
)
866 return mem_rw(file
, (char __user
*)buf
, count
, ppos
, 1);
869 loff_t
mem_lseek(struct file
*file
, loff_t offset
, int orig
)
873 file
->f_pos
= offset
;
876 file
->f_pos
+= offset
;
881 force_successful_syscall_return();
885 static int mem_release(struct inode
*inode
, struct file
*file
)
887 struct mm_struct
*mm
= file
->private_data
;
893 static const struct file_operations proc_mem_operations
= {
898 .release
= mem_release
,
901 static int environ_open(struct inode
*inode
, struct file
*file
)
903 return __mem_open(inode
, file
, PTRACE_MODE_READ
);
906 static ssize_t
environ_read(struct file
*file
, char __user
*buf
,
907 size_t count
, loff_t
*ppos
)
910 unsigned long src
= *ppos
;
912 struct mm_struct
*mm
= file
->private_data
;
913 unsigned long env_start
, env_end
;
915 /* Ensure the process spawned far enough to have an environment. */
916 if (!mm
|| !mm
->env_end
)
919 page
= (char *)__get_free_page(GFP_TEMPORARY
);
924 if (!atomic_inc_not_zero(&mm
->mm_users
))
927 down_read(&mm
->mmap_sem
);
928 env_start
= mm
->env_start
;
929 env_end
= mm
->env_end
;
930 up_read(&mm
->mmap_sem
);
933 size_t this_len
, max_len
;
936 if (src
>= (env_end
- env_start
))
939 this_len
= env_end
- (env_start
+ src
);
941 max_len
= min_t(size_t, PAGE_SIZE
, count
);
942 this_len
= min(max_len
, this_len
);
944 retval
= access_remote_vm(mm
, (env_start
+ src
), page
, this_len
, 0);
951 if (copy_to_user(buf
, page
, retval
)) {
965 free_page((unsigned long) page
);
969 static const struct file_operations proc_environ_operations
= {
970 .open
= environ_open
,
971 .read
= environ_read
,
972 .llseek
= generic_file_llseek
,
973 .release
= mem_release
,
976 static int auxv_open(struct inode
*inode
, struct file
*file
)
978 return __mem_open(inode
, file
, PTRACE_MODE_READ_FSCREDS
);
981 static ssize_t
auxv_read(struct file
*file
, char __user
*buf
,
982 size_t count
, loff_t
*ppos
)
984 struct mm_struct
*mm
= file
->private_data
;
985 unsigned int nwords
= 0;
991 } while (mm
->saved_auxv
[nwords
- 2] != 0); /* AT_NULL */
992 return simple_read_from_buffer(buf
, count
, ppos
, mm
->saved_auxv
,
993 nwords
* sizeof(mm
->saved_auxv
[0]));
996 static const struct file_operations proc_auxv_operations
= {
999 .llseek
= generic_file_llseek
,
1000 .release
= mem_release
,
1003 static ssize_t
oom_adj_read(struct file
*file
, char __user
*buf
, size_t count
,
1006 struct task_struct
*task
= get_proc_task(file_inode(file
));
1007 char buffer
[PROC_NUMBUF
];
1008 int oom_adj
= OOM_ADJUST_MIN
;
1013 if (task
->signal
->oom_score_adj
== OOM_SCORE_ADJ_MAX
)
1014 oom_adj
= OOM_ADJUST_MAX
;
1016 oom_adj
= (task
->signal
->oom_score_adj
* -OOM_DISABLE
) /
1018 put_task_struct(task
);
1019 len
= snprintf(buffer
, sizeof(buffer
), "%d\n", oom_adj
);
1020 return simple_read_from_buffer(buf
, count
, ppos
, buffer
, len
);
1023 static int __set_oom_adj(struct file
*file
, int oom_adj
, bool legacy
)
1025 static DEFINE_MUTEX(oom_adj_mutex
);
1026 struct mm_struct
*mm
= NULL
;
1027 struct task_struct
*task
;
1030 task
= get_proc_task(file_inode(file
));
1034 mutex_lock(&oom_adj_mutex
);
1036 if (oom_adj
< task
->signal
->oom_score_adj
&&
1037 !capable(CAP_SYS_RESOURCE
)) {
1042 * /proc/pid/oom_adj is provided for legacy purposes, ask users to use
1043 * /proc/pid/oom_score_adj instead.
1045 pr_warn_once("%s (%d): /proc/%d/oom_adj is deprecated, please use /proc/%d/oom_score_adj instead.\n",
1046 current
->comm
, task_pid_nr(current
), task_pid_nr(task
),
1049 if ((short)oom_adj
< task
->signal
->oom_score_adj_min
&&
1050 !capable(CAP_SYS_RESOURCE
)) {
1057 * Make sure we will check other processes sharing the mm if this is
1058 * not vfrok which wants its own oom_score_adj.
1059 * pin the mm so it doesn't go away and get reused after task_unlock
1061 if (!task
->vfork_done
) {
1062 struct task_struct
*p
= find_lock_task_mm(task
);
1065 if (atomic_read(&p
->mm
->mm_users
) > 1) {
1073 task
->signal
->oom_score_adj
= oom_adj
;
1074 if (!legacy
&& has_capability_noaudit(current
, CAP_SYS_RESOURCE
))
1075 task
->signal
->oom_score_adj_min
= (short)oom_adj
;
1076 trace_oom_score_adj_update(task
);
1079 struct task_struct
*p
;
1082 for_each_process(p
) {
1083 if (same_thread_group(task
, p
))
1086 /* do not touch kernel threads or the global init */
1087 if (p
->flags
& PF_KTHREAD
|| is_global_init(p
))
1091 if (!p
->vfork_done
&& process_shares_mm(p
, mm
)) {
1092 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",
1093 task_pid_nr(p
), p
->comm
,
1094 p
->signal
->oom_score_adj
, oom_adj
,
1095 task_pid_nr(task
), task
->comm
);
1096 p
->signal
->oom_score_adj
= oom_adj
;
1097 if (!legacy
&& has_capability_noaudit(current
, CAP_SYS_RESOURCE
))
1098 p
->signal
->oom_score_adj_min
= (short)oom_adj
;
1106 mutex_unlock(&oom_adj_mutex
);
1107 put_task_struct(task
);
1112 * /proc/pid/oom_adj exists solely for backwards compatibility with previous
1113 * kernels. The effective policy is defined by oom_score_adj, which has a
1114 * different scale: oom_adj grew exponentially and oom_score_adj grows linearly.
1115 * Values written to oom_adj are simply mapped linearly to oom_score_adj.
1116 * Processes that become oom disabled via oom_adj will still be oom disabled
1117 * with this implementation.
1119 * oom_adj cannot be removed since existing userspace binaries use it.
1121 static ssize_t
oom_adj_write(struct file
*file
, const char __user
*buf
,
1122 size_t count
, loff_t
*ppos
)
1124 char buffer
[PROC_NUMBUF
];
1128 memset(buffer
, 0, sizeof(buffer
));
1129 if (count
> sizeof(buffer
) - 1)
1130 count
= sizeof(buffer
) - 1;
1131 if (copy_from_user(buffer
, buf
, count
)) {
1136 err
= kstrtoint(strstrip(buffer
), 0, &oom_adj
);
1139 if ((oom_adj
< OOM_ADJUST_MIN
|| oom_adj
> OOM_ADJUST_MAX
) &&
1140 oom_adj
!= OOM_DISABLE
) {
1146 * Scale /proc/pid/oom_score_adj appropriately ensuring that a maximum
1147 * value is always attainable.
1149 if (oom_adj
== OOM_ADJUST_MAX
)
1150 oom_adj
= OOM_SCORE_ADJ_MAX
;
1152 oom_adj
= (oom_adj
* OOM_SCORE_ADJ_MAX
) / -OOM_DISABLE
;
1154 err
= __set_oom_adj(file
, oom_adj
, true);
1156 return err
< 0 ? err
: count
;
1159 static const struct file_operations proc_oom_adj_operations
= {
1160 .read
= oom_adj_read
,
1161 .write
= oom_adj_write
,
1162 .llseek
= generic_file_llseek
,
1165 static ssize_t
oom_score_adj_read(struct file
*file
, char __user
*buf
,
1166 size_t count
, loff_t
*ppos
)
1168 struct task_struct
*task
= get_proc_task(file_inode(file
));
1169 char buffer
[PROC_NUMBUF
];
1170 short oom_score_adj
= OOM_SCORE_ADJ_MIN
;
1175 oom_score_adj
= task
->signal
->oom_score_adj
;
1176 put_task_struct(task
);
1177 len
= snprintf(buffer
, sizeof(buffer
), "%hd\n", oom_score_adj
);
1178 return simple_read_from_buffer(buf
, count
, ppos
, buffer
, len
);
1181 static ssize_t
oom_score_adj_write(struct file
*file
, const char __user
*buf
,
1182 size_t count
, loff_t
*ppos
)
1184 char buffer
[PROC_NUMBUF
];
1188 memset(buffer
, 0, sizeof(buffer
));
1189 if (count
> sizeof(buffer
) - 1)
1190 count
= sizeof(buffer
) - 1;
1191 if (copy_from_user(buffer
, buf
, count
)) {
1196 err
= kstrtoint(strstrip(buffer
), 0, &oom_score_adj
);
1199 if (oom_score_adj
< OOM_SCORE_ADJ_MIN
||
1200 oom_score_adj
> OOM_SCORE_ADJ_MAX
) {
1205 err
= __set_oom_adj(file
, oom_score_adj
, false);
1207 return err
< 0 ? err
: count
;
1210 static const struct file_operations proc_oom_score_adj_operations
= {
1211 .read
= oom_score_adj_read
,
1212 .write
= oom_score_adj_write
,
1213 .llseek
= default_llseek
,
1216 #ifdef CONFIG_AUDITSYSCALL
1217 #define TMPBUFLEN 11
1218 static ssize_t
proc_loginuid_read(struct file
* file
, char __user
* buf
,
1219 size_t count
, loff_t
*ppos
)
1221 struct inode
* inode
= file_inode(file
);
1222 struct task_struct
*task
= get_proc_task(inode
);
1224 char tmpbuf
[TMPBUFLEN
];
1228 length
= scnprintf(tmpbuf
, TMPBUFLEN
, "%u",
1229 from_kuid(file
->f_cred
->user_ns
,
1230 audit_get_loginuid(task
)));
1231 put_task_struct(task
);
1232 return simple_read_from_buffer(buf
, count
, ppos
, tmpbuf
, length
);
1235 static ssize_t
proc_loginuid_write(struct file
* file
, const char __user
* buf
,
1236 size_t count
, loff_t
*ppos
)
1238 struct inode
* inode
= file_inode(file
);
1244 if (current
!= pid_task(proc_pid(inode
), PIDTYPE_PID
)) {
1251 /* No partial writes. */
1255 rv
= kstrtou32_from_user(buf
, count
, 10, &loginuid
);
1259 /* is userspace tring to explicitly UNSET the loginuid? */
1260 if (loginuid
== AUDIT_UID_UNSET
) {
1261 kloginuid
= INVALID_UID
;
1263 kloginuid
= make_kuid(file
->f_cred
->user_ns
, loginuid
);
1264 if (!uid_valid(kloginuid
))
1268 rv
= audit_set_loginuid(kloginuid
);
1274 static const struct file_operations proc_loginuid_operations
= {
1275 .read
= proc_loginuid_read
,
1276 .write
= proc_loginuid_write
,
1277 .llseek
= generic_file_llseek
,
1280 static ssize_t
proc_sessionid_read(struct file
* file
, char __user
* buf
,
1281 size_t count
, loff_t
*ppos
)
1283 struct inode
* inode
= file_inode(file
);
1284 struct task_struct
*task
= get_proc_task(inode
);
1286 char tmpbuf
[TMPBUFLEN
];
1290 length
= scnprintf(tmpbuf
, TMPBUFLEN
, "%u",
1291 audit_get_sessionid(task
));
1292 put_task_struct(task
);
1293 return simple_read_from_buffer(buf
, count
, ppos
, tmpbuf
, length
);
1296 static const struct file_operations proc_sessionid_operations
= {
1297 .read
= proc_sessionid_read
,
1298 .llseek
= generic_file_llseek
,
1302 #ifdef CONFIG_FAULT_INJECTION
1303 static ssize_t
proc_fault_inject_read(struct file
* file
, char __user
* buf
,
1304 size_t count
, loff_t
*ppos
)
1306 struct task_struct
*task
= get_proc_task(file_inode(file
));
1307 char buffer
[PROC_NUMBUF
];
1313 make_it_fail
= task
->make_it_fail
;
1314 put_task_struct(task
);
1316 len
= snprintf(buffer
, sizeof(buffer
), "%i\n", make_it_fail
);
1318 return simple_read_from_buffer(buf
, count
, ppos
, buffer
, len
);
1321 static ssize_t
proc_fault_inject_write(struct file
* file
,
1322 const char __user
* buf
, size_t count
, loff_t
*ppos
)
1324 struct task_struct
*task
;
1325 char buffer
[PROC_NUMBUF
];
1329 if (!capable(CAP_SYS_RESOURCE
))
1331 memset(buffer
, 0, sizeof(buffer
));
1332 if (count
> sizeof(buffer
) - 1)
1333 count
= sizeof(buffer
) - 1;
1334 if (copy_from_user(buffer
, buf
, count
))
1336 rv
= kstrtoint(strstrip(buffer
), 0, &make_it_fail
);
1339 if (make_it_fail
< 0 || make_it_fail
> 1)
1342 task
= get_proc_task(file_inode(file
));
1345 task
->make_it_fail
= make_it_fail
;
1346 put_task_struct(task
);
1351 static const struct file_operations proc_fault_inject_operations
= {
1352 .read
= proc_fault_inject_read
,
1353 .write
= proc_fault_inject_write
,
1354 .llseek
= generic_file_llseek
,
1359 #ifdef CONFIG_SCHED_DEBUG
1361 * Print out various scheduling related per-task fields:
1363 static int sched_show(struct seq_file
*m
, void *v
)
1365 struct inode
*inode
= m
->private;
1366 struct task_struct
*p
;
1368 p
= get_proc_task(inode
);
1371 proc_sched_show_task(p
, m
);
1379 sched_write(struct file
*file
, const char __user
*buf
,
1380 size_t count
, loff_t
*offset
)
1382 struct inode
*inode
= file_inode(file
);
1383 struct task_struct
*p
;
1385 p
= get_proc_task(inode
);
1388 proc_sched_set_task(p
);
1395 static int sched_open(struct inode
*inode
, struct file
*filp
)
1397 return single_open(filp
, sched_show
, inode
);
1400 static const struct file_operations proc_pid_sched_operations
= {
1403 .write
= sched_write
,
1404 .llseek
= seq_lseek
,
1405 .release
= single_release
,
1410 #ifdef CONFIG_SCHED_AUTOGROUP
1412 * Print out autogroup related information:
1414 static int sched_autogroup_show(struct seq_file
*m
, void *v
)
1416 struct inode
*inode
= m
->private;
1417 struct task_struct
*p
;
1419 p
= get_proc_task(inode
);
1422 proc_sched_autogroup_show_task(p
, m
);
1430 sched_autogroup_write(struct file
*file
, const char __user
*buf
,
1431 size_t count
, loff_t
*offset
)
1433 struct inode
*inode
= file_inode(file
);
1434 struct task_struct
*p
;
1435 char buffer
[PROC_NUMBUF
];
1439 memset(buffer
, 0, sizeof(buffer
));
1440 if (count
> sizeof(buffer
) - 1)
1441 count
= sizeof(buffer
) - 1;
1442 if (copy_from_user(buffer
, buf
, count
))
1445 err
= kstrtoint(strstrip(buffer
), 0, &nice
);
1449 p
= get_proc_task(inode
);
1453 err
= proc_sched_autogroup_set_nice(p
, nice
);
1462 static int sched_autogroup_open(struct inode
*inode
, struct file
*filp
)
1466 ret
= single_open(filp
, sched_autogroup_show
, NULL
);
1468 struct seq_file
*m
= filp
->private_data
;
1475 static const struct file_operations proc_pid_sched_autogroup_operations
= {
1476 .open
= sched_autogroup_open
,
1478 .write
= sched_autogroup_write
,
1479 .llseek
= seq_lseek
,
1480 .release
= single_release
,
1483 #endif /* CONFIG_SCHED_AUTOGROUP */
1485 static ssize_t
comm_write(struct file
*file
, const char __user
*buf
,
1486 size_t count
, loff_t
*offset
)
1488 struct inode
*inode
= file_inode(file
);
1489 struct task_struct
*p
;
1490 char buffer
[TASK_COMM_LEN
];
1491 const size_t maxlen
= sizeof(buffer
) - 1;
1493 memset(buffer
, 0, sizeof(buffer
));
1494 if (copy_from_user(buffer
, buf
, count
> maxlen
? maxlen
: count
))
1497 p
= get_proc_task(inode
);
1501 if (same_thread_group(current
, p
))
1502 set_task_comm(p
, buffer
);
1511 static int comm_show(struct seq_file
*m
, void *v
)
1513 struct inode
*inode
= m
->private;
1514 struct task_struct
*p
;
1516 p
= get_proc_task(inode
);
1521 seq_printf(m
, "%s\n", p
->comm
);
1529 static int comm_open(struct inode
*inode
, struct file
*filp
)
1531 return single_open(filp
, comm_show
, inode
);
1534 static const struct file_operations proc_pid_set_comm_operations
= {
1537 .write
= comm_write
,
1538 .llseek
= seq_lseek
,
1539 .release
= single_release
,
1542 static int proc_exe_link(struct dentry
*dentry
, struct path
*exe_path
)
1544 struct task_struct
*task
;
1545 struct file
*exe_file
;
1547 task
= get_proc_task(d_inode(dentry
));
1550 exe_file
= get_task_exe_file(task
);
1551 put_task_struct(task
);
1553 *exe_path
= exe_file
->f_path
;
1554 path_get(&exe_file
->f_path
);
1561 static const char *proc_pid_get_link(struct dentry
*dentry
,
1562 struct inode
*inode
,
1563 struct delayed_call
*done
)
1566 int error
= -EACCES
;
1569 return ERR_PTR(-ECHILD
);
1571 /* Are we allowed to snoop on the tasks file descriptors? */
1572 if (!proc_fd_access_allowed(inode
))
1575 error
= PROC_I(inode
)->op
.proc_get_link(dentry
, &path
);
1579 nd_jump_link(&path
);
1582 return ERR_PTR(error
);
1585 static int do_proc_readlink(struct path
*path
, char __user
*buffer
, int buflen
)
1587 char *tmp
= (char*)__get_free_page(GFP_TEMPORARY
);
1594 pathname
= d_path(path
, tmp
, PAGE_SIZE
);
1595 len
= PTR_ERR(pathname
);
1596 if (IS_ERR(pathname
))
1598 len
= tmp
+ PAGE_SIZE
- 1 - pathname
;
1602 if (copy_to_user(buffer
, pathname
, len
))
1605 free_page((unsigned long)tmp
);
1609 static int proc_pid_readlink(struct dentry
* dentry
, char __user
* buffer
, int buflen
)
1611 int error
= -EACCES
;
1612 struct inode
*inode
= d_inode(dentry
);
1615 /* Are we allowed to snoop on the tasks file descriptors? */
1616 if (!proc_fd_access_allowed(inode
))
1619 error
= PROC_I(inode
)->op
.proc_get_link(dentry
, &path
);
1623 error
= do_proc_readlink(&path
, buffer
, buflen
);
1629 const struct inode_operations proc_pid_link_inode_operations
= {
1630 .readlink
= proc_pid_readlink
,
1631 .get_link
= proc_pid_get_link
,
1632 .setattr
= proc_setattr
,
1636 /* building an inode */
1638 void task_dump_owner(struct task_struct
*task
, mode_t mode
,
1639 kuid_t
*ruid
, kgid_t
*rgid
)
1641 /* Depending on the state of dumpable compute who should own a
1642 * proc file for a task.
1644 const struct cred
*cred
;
1648 /* Default to the tasks effective ownership */
1650 cred
= __task_cred(task
);
1656 * Before the /proc/pid/status file was created the only way to read
1657 * the effective uid of a /process was to stat /proc/pid. Reading
1658 * /proc/pid/status is slow enough that procps and other packages
1659 * kept stating /proc/pid. To keep the rules in /proc simple I have
1660 * made this apply to all per process world readable and executable
1663 if (mode
!= (S_IFDIR
|S_IRUGO
|S_IXUGO
)) {
1664 struct mm_struct
*mm
;
1667 /* Make non-dumpable tasks owned by some root */
1669 if (get_dumpable(mm
) != SUID_DUMP_USER
) {
1670 struct user_namespace
*user_ns
= mm
->user_ns
;
1672 uid
= make_kuid(user_ns
, 0);
1673 if (!uid_valid(uid
))
1674 uid
= GLOBAL_ROOT_UID
;
1676 gid
= make_kgid(user_ns
, 0);
1677 if (!gid_valid(gid
))
1678 gid
= GLOBAL_ROOT_GID
;
1681 uid
= GLOBAL_ROOT_UID
;
1682 gid
= GLOBAL_ROOT_GID
;
1690 struct inode
*proc_pid_make_inode(struct super_block
* sb
,
1691 struct task_struct
*task
, umode_t mode
)
1693 struct inode
* inode
;
1694 struct proc_inode
*ei
;
1696 /* We need a new inode */
1698 inode
= new_inode(sb
);
1704 inode
->i_mode
= mode
;
1705 inode
->i_ino
= get_next_ino();
1706 inode
->i_mtime
= inode
->i_atime
= inode
->i_ctime
= current_time(inode
);
1707 inode
->i_op
= &proc_def_inode_operations
;
1710 * grab the reference to task.
1712 ei
->pid
= get_task_pid(task
, PIDTYPE_PID
);
1716 task_dump_owner(task
, 0, &inode
->i_uid
, &inode
->i_gid
);
1717 security_task_to_inode(task
, inode
);
1727 int pid_getattr(struct vfsmount
*mnt
, struct dentry
*dentry
, struct kstat
*stat
)
1729 struct inode
*inode
= d_inode(dentry
);
1730 struct task_struct
*task
;
1731 struct pid_namespace
*pid
= dentry
->d_sb
->s_fs_info
;
1733 generic_fillattr(inode
, stat
);
1736 stat
->uid
= GLOBAL_ROOT_UID
;
1737 stat
->gid
= GLOBAL_ROOT_GID
;
1738 task
= pid_task(proc_pid(inode
), PIDTYPE_PID
);
1740 if (!has_pid_permissions(pid
, task
, HIDEPID_INVISIBLE
)) {
1743 * This doesn't prevent learning whether PID exists,
1744 * it only makes getattr() consistent with readdir().
1748 task_dump_owner(task
, inode
->i_mode
, &stat
->uid
, &stat
->gid
);
1757 * Exceptional case: normally we are not allowed to unhash a busy
1758 * directory. In this case, however, we can do it - no aliasing problems
1759 * due to the way we treat inodes.
1761 * Rewrite the inode's ownerships here because the owning task may have
1762 * performed a setuid(), etc.
1765 int pid_revalidate(struct dentry
*dentry
, unsigned int flags
)
1767 struct inode
*inode
;
1768 struct task_struct
*task
;
1770 if (flags
& LOOKUP_RCU
)
1773 inode
= d_inode(dentry
);
1774 task
= get_proc_task(inode
);
1777 task_dump_owner(task
, inode
->i_mode
, &inode
->i_uid
, &inode
->i_gid
);
1779 inode
->i_mode
&= ~(S_ISUID
| S_ISGID
);
1780 security_task_to_inode(task
, inode
);
1781 put_task_struct(task
);
1787 static inline bool proc_inode_is_dead(struct inode
*inode
)
1789 return !proc_pid(inode
)->tasks
[PIDTYPE_PID
].first
;
1792 int pid_delete_dentry(const struct dentry
*dentry
)
1794 /* Is the task we represent dead?
1795 * If so, then don't put the dentry on the lru list,
1796 * kill it immediately.
1798 return proc_inode_is_dead(d_inode(dentry
));
1801 const struct dentry_operations pid_dentry_operations
=
1803 .d_revalidate
= pid_revalidate
,
1804 .d_delete
= pid_delete_dentry
,
1810 * Fill a directory entry.
1812 * If possible create the dcache entry and derive our inode number and
1813 * file type from dcache entry.
1815 * Since all of the proc inode numbers are dynamically generated, the inode
1816 * numbers do not exist until the inode is cache. This means creating the
1817 * the dcache entry in readdir is necessary to keep the inode numbers
1818 * reported by readdir in sync with the inode numbers reported
1821 bool proc_fill_cache(struct file
*file
, struct dir_context
*ctx
,
1822 const char *name
, int len
,
1823 instantiate_t instantiate
, struct task_struct
*task
, const void *ptr
)
1825 struct dentry
*child
, *dir
= file
->f_path
.dentry
;
1826 struct qstr qname
= QSTR_INIT(name
, len
);
1827 struct inode
*inode
;
1831 child
= d_hash_and_lookup(dir
, &qname
);
1833 DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq
);
1834 child
= d_alloc_parallel(dir
, &qname
, &wq
);
1836 goto end_instantiate
;
1837 if (d_in_lookup(child
)) {
1838 int err
= instantiate(d_inode(dir
), child
, task
, ptr
);
1839 d_lookup_done(child
);
1842 goto end_instantiate
;
1846 inode
= d_inode(child
);
1848 type
= inode
->i_mode
>> 12;
1850 return dir_emit(ctx
, name
, len
, ino
, type
);
1853 return dir_emit(ctx
, name
, len
, 1, DT_UNKNOWN
);
1857 * dname_to_vma_addr - maps a dentry name into two unsigned longs
1858 * which represent vma start and end addresses.
1860 static int dname_to_vma_addr(struct dentry
*dentry
,
1861 unsigned long *start
, unsigned long *end
)
1863 if (sscanf(dentry
->d_name
.name
, "%lx-%lx", start
, end
) != 2)
1869 static int map_files_d_revalidate(struct dentry
*dentry
, unsigned int flags
)
1871 unsigned long vm_start
, vm_end
;
1872 bool exact_vma_exists
= false;
1873 struct mm_struct
*mm
= NULL
;
1874 struct task_struct
*task
;
1875 struct inode
*inode
;
1878 if (flags
& LOOKUP_RCU
)
1881 inode
= d_inode(dentry
);
1882 task
= get_proc_task(inode
);
1886 mm
= mm_access(task
, PTRACE_MODE_READ_FSCREDS
);
1887 if (IS_ERR_OR_NULL(mm
))
1890 if (!dname_to_vma_addr(dentry
, &vm_start
, &vm_end
)) {
1891 down_read(&mm
->mmap_sem
);
1892 exact_vma_exists
= !!find_exact_vma(mm
, vm_start
, vm_end
);
1893 up_read(&mm
->mmap_sem
);
1898 if (exact_vma_exists
) {
1899 task_dump_owner(task
, 0, &inode
->i_uid
, &inode
->i_gid
);
1901 security_task_to_inode(task
, inode
);
1906 put_task_struct(task
);
1912 static const struct dentry_operations tid_map_files_dentry_operations
= {
1913 .d_revalidate
= map_files_d_revalidate
,
1914 .d_delete
= pid_delete_dentry
,
1917 static int map_files_get_link(struct dentry
*dentry
, struct path
*path
)
1919 unsigned long vm_start
, vm_end
;
1920 struct vm_area_struct
*vma
;
1921 struct task_struct
*task
;
1922 struct mm_struct
*mm
;
1926 task
= get_proc_task(d_inode(dentry
));
1930 mm
= get_task_mm(task
);
1931 put_task_struct(task
);
1935 rc
= dname_to_vma_addr(dentry
, &vm_start
, &vm_end
);
1940 down_read(&mm
->mmap_sem
);
1941 vma
= find_exact_vma(mm
, vm_start
, vm_end
);
1942 if (vma
&& vma
->vm_file
) {
1943 *path
= vma
->vm_file
->f_path
;
1947 up_read(&mm
->mmap_sem
);
1955 struct map_files_info
{
1958 unsigned char name
[4*sizeof(long)+2]; /* max: %lx-%lx\0 */
1962 * Only allow CAP_SYS_ADMIN to follow the links, due to concerns about how the
1963 * symlinks may be used to bypass permissions on ancestor directories in the
1964 * path to the file in question.
1967 proc_map_files_get_link(struct dentry
*dentry
,
1968 struct inode
*inode
,
1969 struct delayed_call
*done
)
1971 if (!capable(CAP_SYS_ADMIN
))
1972 return ERR_PTR(-EPERM
);
1974 return proc_pid_get_link(dentry
, inode
, done
);
1978 * Identical to proc_pid_link_inode_operations except for get_link()
1980 static const struct inode_operations proc_map_files_link_inode_operations
= {
1981 .readlink
= proc_pid_readlink
,
1982 .get_link
= proc_map_files_get_link
,
1983 .setattr
= proc_setattr
,
1987 proc_map_files_instantiate(struct inode
*dir
, struct dentry
*dentry
,
1988 struct task_struct
*task
, const void *ptr
)
1990 fmode_t mode
= (fmode_t
)(unsigned long)ptr
;
1991 struct proc_inode
*ei
;
1992 struct inode
*inode
;
1994 inode
= proc_pid_make_inode(dir
->i_sb
, task
, S_IFLNK
|
1995 ((mode
& FMODE_READ
) ? S_IRUSR
: 0) |
1996 ((mode
& FMODE_WRITE
) ? S_IWUSR
: 0));
2001 ei
->op
.proc_get_link
= map_files_get_link
;
2003 inode
->i_op
= &proc_map_files_link_inode_operations
;
2006 d_set_d_op(dentry
, &tid_map_files_dentry_operations
);
2007 d_add(dentry
, inode
);
2012 static struct dentry
*proc_map_files_lookup(struct inode
*dir
,
2013 struct dentry
*dentry
, unsigned int flags
)
2015 unsigned long vm_start
, vm_end
;
2016 struct vm_area_struct
*vma
;
2017 struct task_struct
*task
;
2019 struct mm_struct
*mm
;
2022 task
= get_proc_task(dir
);
2027 if (!ptrace_may_access(task
, PTRACE_MODE_READ_FSCREDS
))
2031 if (dname_to_vma_addr(dentry
, &vm_start
, &vm_end
))
2034 mm
= get_task_mm(task
);
2038 down_read(&mm
->mmap_sem
);
2039 vma
= find_exact_vma(mm
, vm_start
, vm_end
);
2044 result
= proc_map_files_instantiate(dir
, dentry
, task
,
2045 (void *)(unsigned long)vma
->vm_file
->f_mode
);
2048 up_read(&mm
->mmap_sem
);
2051 put_task_struct(task
);
2053 return ERR_PTR(result
);
2056 static const struct inode_operations proc_map_files_inode_operations
= {
2057 .lookup
= proc_map_files_lookup
,
2058 .permission
= proc_fd_permission
,
2059 .setattr
= proc_setattr
,
2063 proc_map_files_readdir(struct file
*file
, struct dir_context
*ctx
)
2065 struct vm_area_struct
*vma
;
2066 struct task_struct
*task
;
2067 struct mm_struct
*mm
;
2068 unsigned long nr_files
, pos
, i
;
2069 struct flex_array
*fa
= NULL
;
2070 struct map_files_info info
;
2071 struct map_files_info
*p
;
2075 task
= get_proc_task(file_inode(file
));
2080 if (!ptrace_may_access(task
, PTRACE_MODE_READ_FSCREDS
))
2084 if (!dir_emit_dots(file
, ctx
))
2087 mm
= get_task_mm(task
);
2090 down_read(&mm
->mmap_sem
);
2095 * We need two passes here:
2097 * 1) Collect vmas of mapped files with mmap_sem taken
2098 * 2) Release mmap_sem and instantiate entries
2100 * otherwise we get lockdep complained, since filldir()
2101 * routine might require mmap_sem taken in might_fault().
2104 for (vma
= mm
->mmap
, pos
= 2; vma
; vma
= vma
->vm_next
) {
2105 if (vma
->vm_file
&& ++pos
> ctx
->pos
)
2110 fa
= flex_array_alloc(sizeof(info
), nr_files
,
2112 if (!fa
|| flex_array_prealloc(fa
, 0, nr_files
,
2116 flex_array_free(fa
);
2117 up_read(&mm
->mmap_sem
);
2121 for (i
= 0, vma
= mm
->mmap
, pos
= 2; vma
;
2122 vma
= vma
->vm_next
) {
2125 if (++pos
<= ctx
->pos
)
2128 info
.mode
= vma
->vm_file
->f_mode
;
2129 info
.len
= snprintf(info
.name
,
2130 sizeof(info
.name
), "%lx-%lx",
2131 vma
->vm_start
, vma
->vm_end
);
2132 if (flex_array_put(fa
, i
++, &info
, GFP_KERNEL
))
2136 up_read(&mm
->mmap_sem
);
2138 for (i
= 0; i
< nr_files
; i
++) {
2139 p
= flex_array_get(fa
, i
);
2140 if (!proc_fill_cache(file
, ctx
,
2142 proc_map_files_instantiate
,
2144 (void *)(unsigned long)p
->mode
))
2149 flex_array_free(fa
);
2153 put_task_struct(task
);
2158 static const struct file_operations proc_map_files_operations
= {
2159 .read
= generic_read_dir
,
2160 .iterate_shared
= proc_map_files_readdir
,
2161 .llseek
= generic_file_llseek
,
2164 #if defined(CONFIG_CHECKPOINT_RESTORE) && defined(CONFIG_POSIX_TIMERS)
2165 struct timers_private
{
2167 struct task_struct
*task
;
2168 struct sighand_struct
*sighand
;
2169 struct pid_namespace
*ns
;
2170 unsigned long flags
;
2173 static void *timers_start(struct seq_file
*m
, loff_t
*pos
)
2175 struct timers_private
*tp
= m
->private;
2177 tp
->task
= get_pid_task(tp
->pid
, PIDTYPE_PID
);
2179 return ERR_PTR(-ESRCH
);
2181 tp
->sighand
= lock_task_sighand(tp
->task
, &tp
->flags
);
2183 return ERR_PTR(-ESRCH
);
2185 return seq_list_start(&tp
->task
->signal
->posix_timers
, *pos
);
2188 static void *timers_next(struct seq_file
*m
, void *v
, loff_t
*pos
)
2190 struct timers_private
*tp
= m
->private;
2191 return seq_list_next(v
, &tp
->task
->signal
->posix_timers
, pos
);
2194 static void timers_stop(struct seq_file
*m
, void *v
)
2196 struct timers_private
*tp
= m
->private;
2199 unlock_task_sighand(tp
->task
, &tp
->flags
);
2204 put_task_struct(tp
->task
);
2209 static int show_timer(struct seq_file
*m
, void *v
)
2211 struct k_itimer
*timer
;
2212 struct timers_private
*tp
= m
->private;
2214 static const char * const nstr
[] = {
2215 [SIGEV_SIGNAL
] = "signal",
2216 [SIGEV_NONE
] = "none",
2217 [SIGEV_THREAD
] = "thread",
2220 timer
= list_entry((struct list_head
*)v
, struct k_itimer
, list
);
2221 notify
= timer
->it_sigev_notify
;
2223 seq_printf(m
, "ID: %d\n", timer
->it_id
);
2224 seq_printf(m
, "signal: %d/%p\n",
2225 timer
->sigq
->info
.si_signo
,
2226 timer
->sigq
->info
.si_value
.sival_ptr
);
2227 seq_printf(m
, "notify: %s/%s.%d\n",
2228 nstr
[notify
& ~SIGEV_THREAD_ID
],
2229 (notify
& SIGEV_THREAD_ID
) ? "tid" : "pid",
2230 pid_nr_ns(timer
->it_pid
, tp
->ns
));
2231 seq_printf(m
, "ClockID: %d\n", timer
->it_clock
);
2236 static const struct seq_operations proc_timers_seq_ops
= {
2237 .start
= timers_start
,
2238 .next
= timers_next
,
2239 .stop
= timers_stop
,
2243 static int proc_timers_open(struct inode
*inode
, struct file
*file
)
2245 struct timers_private
*tp
;
2247 tp
= __seq_open_private(file
, &proc_timers_seq_ops
,
2248 sizeof(struct timers_private
));
2252 tp
->pid
= proc_pid(inode
);
2253 tp
->ns
= inode
->i_sb
->s_fs_info
;
2257 static const struct file_operations proc_timers_operations
= {
2258 .open
= proc_timers_open
,
2260 .llseek
= seq_lseek
,
2261 .release
= seq_release_private
,
2265 static ssize_t
timerslack_ns_write(struct file
*file
, const char __user
*buf
,
2266 size_t count
, loff_t
*offset
)
2268 struct inode
*inode
= file_inode(file
);
2269 struct task_struct
*p
;
2273 err
= kstrtoull_from_user(buf
, count
, 10, &slack_ns
);
2277 p
= get_proc_task(inode
);
2282 if (!capable(CAP_SYS_NICE
)) {
2287 err
= security_task_setscheduler(p
);
2296 p
->timer_slack_ns
= p
->default_timer_slack_ns
;
2298 p
->timer_slack_ns
= slack_ns
;
2307 static int timerslack_ns_show(struct seq_file
*m
, void *v
)
2309 struct inode
*inode
= m
->private;
2310 struct task_struct
*p
;
2313 p
= get_proc_task(inode
);
2319 if (!capable(CAP_SYS_NICE
)) {
2323 err
= security_task_getscheduler(p
);
2329 seq_printf(m
, "%llu\n", p
->timer_slack_ns
);
2338 static int timerslack_ns_open(struct inode
*inode
, struct file
*filp
)
2340 return single_open(filp
, timerslack_ns_show
, inode
);
2343 static const struct file_operations proc_pid_set_timerslack_ns_operations
= {
2344 .open
= timerslack_ns_open
,
2346 .write
= timerslack_ns_write
,
2347 .llseek
= seq_lseek
,
2348 .release
= single_release
,
2351 static int proc_pident_instantiate(struct inode
*dir
,
2352 struct dentry
*dentry
, struct task_struct
*task
, const void *ptr
)
2354 const struct pid_entry
*p
= ptr
;
2355 struct inode
*inode
;
2356 struct proc_inode
*ei
;
2358 inode
= proc_pid_make_inode(dir
->i_sb
, task
, p
->mode
);
2363 if (S_ISDIR(inode
->i_mode
))
2364 set_nlink(inode
, 2); /* Use getattr to fix if necessary */
2366 inode
->i_op
= p
->iop
;
2368 inode
->i_fop
= p
->fop
;
2370 d_set_d_op(dentry
, &pid_dentry_operations
);
2371 d_add(dentry
, inode
);
2372 /* Close the race of the process dying before we return the dentry */
2373 if (pid_revalidate(dentry
, 0))
2379 static struct dentry
*proc_pident_lookup(struct inode
*dir
,
2380 struct dentry
*dentry
,
2381 const struct pid_entry
*ents
,
2385 struct task_struct
*task
= get_proc_task(dir
);
2386 const struct pid_entry
*p
, *last
;
2394 * Yes, it does not scale. And it should not. Don't add
2395 * new entries into /proc/<tgid>/ without very good reasons.
2397 last
= &ents
[nents
];
2398 for (p
= ents
; p
< last
; p
++) {
2399 if (p
->len
!= dentry
->d_name
.len
)
2401 if (!memcmp(dentry
->d_name
.name
, p
->name
, p
->len
))
2407 error
= proc_pident_instantiate(dir
, dentry
, task
, p
);
2409 put_task_struct(task
);
2411 return ERR_PTR(error
);
2414 static int proc_pident_readdir(struct file
*file
, struct dir_context
*ctx
,
2415 const struct pid_entry
*ents
, unsigned int nents
)
2417 struct task_struct
*task
= get_proc_task(file_inode(file
));
2418 const struct pid_entry
*p
;
2423 if (!dir_emit_dots(file
, ctx
))
2426 if (ctx
->pos
>= nents
+ 2)
2429 for (p
= ents
+ (ctx
->pos
- 2); p
< ents
+ nents
; p
++) {
2430 if (!proc_fill_cache(file
, ctx
, p
->name
, p
->len
,
2431 proc_pident_instantiate
, task
, p
))
2436 put_task_struct(task
);
2440 #ifdef CONFIG_SECURITY
2441 static ssize_t
proc_pid_attr_read(struct file
* file
, char __user
* buf
,
2442 size_t count
, loff_t
*ppos
)
2444 struct inode
* inode
= file_inode(file
);
2447 struct task_struct
*task
= get_proc_task(inode
);
2452 length
= security_getprocattr(task
,
2453 (char*)file
->f_path
.dentry
->d_name
.name
,
2455 put_task_struct(task
);
2457 length
= simple_read_from_buffer(buf
, count
, ppos
, p
, length
);
2462 static ssize_t
proc_pid_attr_write(struct file
* file
, const char __user
* buf
,
2463 size_t count
, loff_t
*ppos
)
2465 struct inode
* inode
= file_inode(file
);
2468 struct task_struct
*task
= get_proc_task(inode
);
2474 /* A task may only write its own attributes. */
2476 if (current
!= task
)
2479 if (count
> PAGE_SIZE
)
2482 /* No partial writes. */
2487 page
= memdup_user(buf
, count
);
2489 length
= PTR_ERR(page
);
2493 /* Guard against adverse ptrace interaction */
2494 length
= mutex_lock_interruptible(¤t
->signal
->cred_guard_mutex
);
2498 length
= security_setprocattr(file
->f_path
.dentry
->d_name
.name
,
2500 mutex_unlock(¤t
->signal
->cred_guard_mutex
);
2504 put_task_struct(task
);
2509 static const struct file_operations proc_pid_attr_operations
= {
2510 .read
= proc_pid_attr_read
,
2511 .write
= proc_pid_attr_write
,
2512 .llseek
= generic_file_llseek
,
2515 static const struct pid_entry attr_dir_stuff
[] = {
2516 REG("current", S_IRUGO
|S_IWUGO
, proc_pid_attr_operations
),
2517 REG("prev", S_IRUGO
, proc_pid_attr_operations
),
2518 REG("exec", S_IRUGO
|S_IWUGO
, proc_pid_attr_operations
),
2519 REG("fscreate", S_IRUGO
|S_IWUGO
, proc_pid_attr_operations
),
2520 REG("keycreate", S_IRUGO
|S_IWUGO
, proc_pid_attr_operations
),
2521 REG("sockcreate", S_IRUGO
|S_IWUGO
, proc_pid_attr_operations
),
2524 static int proc_attr_dir_readdir(struct file
*file
, struct dir_context
*ctx
)
2526 return proc_pident_readdir(file
, ctx
,
2527 attr_dir_stuff
, ARRAY_SIZE(attr_dir_stuff
));
2530 static const struct file_operations proc_attr_dir_operations
= {
2531 .read
= generic_read_dir
,
2532 .iterate_shared
= proc_attr_dir_readdir
,
2533 .llseek
= generic_file_llseek
,
2536 static struct dentry
*proc_attr_dir_lookup(struct inode
*dir
,
2537 struct dentry
*dentry
, unsigned int flags
)
2539 return proc_pident_lookup(dir
, dentry
,
2540 attr_dir_stuff
, ARRAY_SIZE(attr_dir_stuff
));
2543 static const struct inode_operations proc_attr_dir_inode_operations
= {
2544 .lookup
= proc_attr_dir_lookup
,
2545 .getattr
= pid_getattr
,
2546 .setattr
= proc_setattr
,
2551 #ifdef CONFIG_ELF_CORE
2552 static ssize_t
proc_coredump_filter_read(struct file
*file
, char __user
*buf
,
2553 size_t count
, loff_t
*ppos
)
2555 struct task_struct
*task
= get_proc_task(file_inode(file
));
2556 struct mm_struct
*mm
;
2557 char buffer
[PROC_NUMBUF
];
2565 mm
= get_task_mm(task
);
2567 len
= snprintf(buffer
, sizeof(buffer
), "%08lx\n",
2568 ((mm
->flags
& MMF_DUMP_FILTER_MASK
) >>
2569 MMF_DUMP_FILTER_SHIFT
));
2571 ret
= simple_read_from_buffer(buf
, count
, ppos
, buffer
, len
);
2574 put_task_struct(task
);
2579 static ssize_t
proc_coredump_filter_write(struct file
*file
,
2580 const char __user
*buf
,
2584 struct task_struct
*task
;
2585 struct mm_struct
*mm
;
2591 ret
= kstrtouint_from_user(buf
, count
, 0, &val
);
2596 task
= get_proc_task(file_inode(file
));
2600 mm
= get_task_mm(task
);
2605 for (i
= 0, mask
= 1; i
< MMF_DUMP_FILTER_BITS
; i
++, mask
<<= 1) {
2607 set_bit(i
+ MMF_DUMP_FILTER_SHIFT
, &mm
->flags
);
2609 clear_bit(i
+ MMF_DUMP_FILTER_SHIFT
, &mm
->flags
);
2614 put_task_struct(task
);
2621 static const struct file_operations proc_coredump_filter_operations
= {
2622 .read
= proc_coredump_filter_read
,
2623 .write
= proc_coredump_filter_write
,
2624 .llseek
= generic_file_llseek
,
2628 #ifdef CONFIG_TASK_IO_ACCOUNTING
2629 static int do_io_accounting(struct task_struct
*task
, struct seq_file
*m
, int whole
)
2631 struct task_io_accounting acct
= task
->ioac
;
2632 unsigned long flags
;
2635 result
= mutex_lock_killable(&task
->signal
->cred_guard_mutex
);
2639 if (!ptrace_may_access(task
, PTRACE_MODE_READ_FSCREDS
)) {
2644 if (whole
&& lock_task_sighand(task
, &flags
)) {
2645 struct task_struct
*t
= task
;
2647 task_io_accounting_add(&acct
, &task
->signal
->ioac
);
2648 while_each_thread(task
, t
)
2649 task_io_accounting_add(&acct
, &t
->ioac
);
2651 unlock_task_sighand(task
, &flags
);
2658 "read_bytes: %llu\n"
2659 "write_bytes: %llu\n"
2660 "cancelled_write_bytes: %llu\n",
2661 (unsigned long long)acct
.rchar
,
2662 (unsigned long long)acct
.wchar
,
2663 (unsigned long long)acct
.syscr
,
2664 (unsigned long long)acct
.syscw
,
2665 (unsigned long long)acct
.read_bytes
,
2666 (unsigned long long)acct
.write_bytes
,
2667 (unsigned long long)acct
.cancelled_write_bytes
);
2671 mutex_unlock(&task
->signal
->cred_guard_mutex
);
2675 static int proc_tid_io_accounting(struct seq_file
*m
, struct pid_namespace
*ns
,
2676 struct pid
*pid
, struct task_struct
*task
)
2678 return do_io_accounting(task
, m
, 0);
2681 static int proc_tgid_io_accounting(struct seq_file
*m
, struct pid_namespace
*ns
,
2682 struct pid
*pid
, struct task_struct
*task
)
2684 return do_io_accounting(task
, m
, 1);
2686 #endif /* CONFIG_TASK_IO_ACCOUNTING */
2688 #ifdef CONFIG_USER_NS
2689 static int proc_id_map_open(struct inode
*inode
, struct file
*file
,
2690 const struct seq_operations
*seq_ops
)
2692 struct user_namespace
*ns
= NULL
;
2693 struct task_struct
*task
;
2694 struct seq_file
*seq
;
2697 task
= get_proc_task(inode
);
2700 ns
= get_user_ns(task_cred_xxx(task
, user_ns
));
2702 put_task_struct(task
);
2707 ret
= seq_open(file
, seq_ops
);
2711 seq
= file
->private_data
;
2721 static int proc_id_map_release(struct inode
*inode
, struct file
*file
)
2723 struct seq_file
*seq
= file
->private_data
;
2724 struct user_namespace
*ns
= seq
->private;
2726 return seq_release(inode
, file
);
2729 static int proc_uid_map_open(struct inode
*inode
, struct file
*file
)
2731 return proc_id_map_open(inode
, file
, &proc_uid_seq_operations
);
2734 static int proc_gid_map_open(struct inode
*inode
, struct file
*file
)
2736 return proc_id_map_open(inode
, file
, &proc_gid_seq_operations
);
2739 static int proc_projid_map_open(struct inode
*inode
, struct file
*file
)
2741 return proc_id_map_open(inode
, file
, &proc_projid_seq_operations
);
2744 static const struct file_operations proc_uid_map_operations
= {
2745 .open
= proc_uid_map_open
,
2746 .write
= proc_uid_map_write
,
2748 .llseek
= seq_lseek
,
2749 .release
= proc_id_map_release
,
2752 static const struct file_operations proc_gid_map_operations
= {
2753 .open
= proc_gid_map_open
,
2754 .write
= proc_gid_map_write
,
2756 .llseek
= seq_lseek
,
2757 .release
= proc_id_map_release
,
2760 static const struct file_operations proc_projid_map_operations
= {
2761 .open
= proc_projid_map_open
,
2762 .write
= proc_projid_map_write
,
2764 .llseek
= seq_lseek
,
2765 .release
= proc_id_map_release
,
2768 static int proc_setgroups_open(struct inode
*inode
, struct file
*file
)
2770 struct user_namespace
*ns
= NULL
;
2771 struct task_struct
*task
;
2775 task
= get_proc_task(inode
);
2778 ns
= get_user_ns(task_cred_xxx(task
, user_ns
));
2780 put_task_struct(task
);
2785 if (file
->f_mode
& FMODE_WRITE
) {
2787 if (!ns_capable(ns
, CAP_SYS_ADMIN
))
2791 ret
= single_open(file
, &proc_setgroups_show
, ns
);
2802 static int proc_setgroups_release(struct inode
*inode
, struct file
*file
)
2804 struct seq_file
*seq
= file
->private_data
;
2805 struct user_namespace
*ns
= seq
->private;
2806 int ret
= single_release(inode
, file
);
2811 static const struct file_operations proc_setgroups_operations
= {
2812 .open
= proc_setgroups_open
,
2813 .write
= proc_setgroups_write
,
2815 .llseek
= seq_lseek
,
2816 .release
= proc_setgroups_release
,
2818 #endif /* CONFIG_USER_NS */
2820 static int proc_pid_personality(struct seq_file
*m
, struct pid_namespace
*ns
,
2821 struct pid
*pid
, struct task_struct
*task
)
2823 int err
= lock_trace(task
);
2825 seq_printf(m
, "%08x\n", task
->personality
);
2834 static const struct file_operations proc_task_operations
;
2835 static const struct inode_operations proc_task_inode_operations
;
2837 static const struct pid_entry tgid_base_stuff
[] = {
2838 DIR("task", S_IRUGO
|S_IXUGO
, proc_task_inode_operations
, proc_task_operations
),
2839 DIR("fd", S_IRUSR
|S_IXUSR
, proc_fd_inode_operations
, proc_fd_operations
),
2840 DIR("map_files", S_IRUSR
|S_IXUSR
, proc_map_files_inode_operations
, proc_map_files_operations
),
2841 DIR("fdinfo", S_IRUSR
|S_IXUSR
, proc_fdinfo_inode_operations
, proc_fdinfo_operations
),
2842 DIR("ns", S_IRUSR
|S_IXUGO
, proc_ns_dir_inode_operations
, proc_ns_dir_operations
),
2844 DIR("net", S_IRUGO
|S_IXUGO
, proc_net_inode_operations
, proc_net_operations
),
2846 REG("environ", S_IRUSR
, proc_environ_operations
),
2847 REG("auxv", S_IRUSR
, proc_auxv_operations
),
2848 ONE("status", S_IRUGO
, proc_pid_status
),
2849 ONE("personality", S_IRUSR
, proc_pid_personality
),
2850 ONE("limits", S_IRUGO
, proc_pid_limits
),
2851 #ifdef CONFIG_SCHED_DEBUG
2852 REG("sched", S_IRUGO
|S_IWUSR
, proc_pid_sched_operations
),
2854 #ifdef CONFIG_SCHED_AUTOGROUP
2855 REG("autogroup", S_IRUGO
|S_IWUSR
, proc_pid_sched_autogroup_operations
),
2857 REG("comm", S_IRUGO
|S_IWUSR
, proc_pid_set_comm_operations
),
2858 #ifdef CONFIG_HAVE_ARCH_TRACEHOOK
2859 ONE("syscall", S_IRUSR
, proc_pid_syscall
),
2861 REG("cmdline", S_IRUGO
, proc_pid_cmdline_ops
),
2862 ONE("stat", S_IRUGO
, proc_tgid_stat
),
2863 ONE("statm", S_IRUGO
, proc_pid_statm
),
2864 REG("maps", S_IRUGO
, proc_pid_maps_operations
),
2866 REG("numa_maps", S_IRUGO
, proc_pid_numa_maps_operations
),
2868 REG("mem", S_IRUSR
|S_IWUSR
, proc_mem_operations
),
2869 LNK("cwd", proc_cwd_link
),
2870 LNK("root", proc_root_link
),
2871 LNK("exe", proc_exe_link
),
2872 REG("mounts", S_IRUGO
, proc_mounts_operations
),
2873 REG("mountinfo", S_IRUGO
, proc_mountinfo_operations
),
2874 REG("mountstats", S_IRUSR
, proc_mountstats_operations
),
2875 #ifdef CONFIG_PROC_PAGE_MONITOR
2876 REG("clear_refs", S_IWUSR
, proc_clear_refs_operations
),
2877 REG("smaps", S_IRUGO
, proc_pid_smaps_operations
),
2878 REG("pagemap", S_IRUSR
, proc_pagemap_operations
),
2880 #ifdef CONFIG_SECURITY
2881 DIR("attr", S_IRUGO
|S_IXUGO
, proc_attr_dir_inode_operations
, proc_attr_dir_operations
),
2883 #ifdef CONFIG_KALLSYMS
2884 ONE("wchan", S_IRUGO
, proc_pid_wchan
),
2886 #ifdef CONFIG_STACKTRACE
2887 ONE("stack", S_IRUSR
, proc_pid_stack
),
2889 #ifdef CONFIG_SCHED_INFO
2890 ONE("schedstat", S_IRUGO
, proc_pid_schedstat
),
2892 #ifdef CONFIG_LATENCYTOP
2893 REG("latency", S_IRUGO
, proc_lstats_operations
),
2895 #ifdef CONFIG_PROC_PID_CPUSET
2896 ONE("cpuset", S_IRUGO
, proc_cpuset_show
),
2898 #ifdef CONFIG_CGROUPS
2899 ONE("cgroup", S_IRUGO
, proc_cgroup_show
),
2901 ONE("oom_score", S_IRUGO
, proc_oom_score
),
2902 REG("oom_adj", S_IRUGO
|S_IWUSR
, proc_oom_adj_operations
),
2903 REG("oom_score_adj", S_IRUGO
|S_IWUSR
, proc_oom_score_adj_operations
),
2904 #ifdef CONFIG_AUDITSYSCALL
2905 REG("loginuid", S_IWUSR
|S_IRUGO
, proc_loginuid_operations
),
2906 REG("sessionid", S_IRUGO
, proc_sessionid_operations
),
2908 #ifdef CONFIG_FAULT_INJECTION
2909 REG("make-it-fail", S_IRUGO
|S_IWUSR
, proc_fault_inject_operations
),
2911 #ifdef CONFIG_ELF_CORE
2912 REG("coredump_filter", S_IRUGO
|S_IWUSR
, proc_coredump_filter_operations
),
2914 #ifdef CONFIG_TASK_IO_ACCOUNTING
2915 ONE("io", S_IRUSR
, proc_tgid_io_accounting
),
2917 #ifdef CONFIG_HARDWALL
2918 ONE("hardwall", S_IRUGO
, proc_pid_hardwall
),
2920 #ifdef CONFIG_USER_NS
2921 REG("uid_map", S_IRUGO
|S_IWUSR
, proc_uid_map_operations
),
2922 REG("gid_map", S_IRUGO
|S_IWUSR
, proc_gid_map_operations
),
2923 REG("projid_map", S_IRUGO
|S_IWUSR
, proc_projid_map_operations
),
2924 REG("setgroups", S_IRUGO
|S_IWUSR
, proc_setgroups_operations
),
2926 #if defined(CONFIG_CHECKPOINT_RESTORE) && defined(CONFIG_POSIX_TIMERS)
2927 REG("timers", S_IRUGO
, proc_timers_operations
),
2929 REG("timerslack_ns", S_IRUGO
|S_IWUGO
, proc_pid_set_timerslack_ns_operations
),
2932 static int proc_tgid_base_readdir(struct file
*file
, struct dir_context
*ctx
)
2934 return proc_pident_readdir(file
, ctx
,
2935 tgid_base_stuff
, ARRAY_SIZE(tgid_base_stuff
));
2938 static const struct file_operations proc_tgid_base_operations
= {
2939 .read
= generic_read_dir
,
2940 .iterate_shared
= proc_tgid_base_readdir
,
2941 .llseek
= generic_file_llseek
,
2944 static struct dentry
*proc_tgid_base_lookup(struct inode
*dir
, struct dentry
*dentry
, unsigned int flags
)
2946 return proc_pident_lookup(dir
, dentry
,
2947 tgid_base_stuff
, ARRAY_SIZE(tgid_base_stuff
));
2950 static const struct inode_operations proc_tgid_base_inode_operations
= {
2951 .lookup
= proc_tgid_base_lookup
,
2952 .getattr
= pid_getattr
,
2953 .setattr
= proc_setattr
,
2954 .permission
= proc_pid_permission
,
2957 static void proc_flush_task_mnt(struct vfsmount
*mnt
, pid_t pid
, pid_t tgid
)
2959 struct dentry
*dentry
, *leader
, *dir
;
2960 char buf
[PROC_NUMBUF
];
2964 name
.len
= snprintf(buf
, sizeof(buf
), "%d", pid
);
2965 /* no ->d_hash() rejects on procfs */
2966 dentry
= d_hash_and_lookup(mnt
->mnt_root
, &name
);
2968 d_invalidate(dentry
);
2976 name
.len
= snprintf(buf
, sizeof(buf
), "%d", tgid
);
2977 leader
= d_hash_and_lookup(mnt
->mnt_root
, &name
);
2982 name
.len
= strlen(name
.name
);
2983 dir
= d_hash_and_lookup(leader
, &name
);
2985 goto out_put_leader
;
2988 name
.len
= snprintf(buf
, sizeof(buf
), "%d", pid
);
2989 dentry
= d_hash_and_lookup(dir
, &name
);
2991 d_invalidate(dentry
);
3003 * proc_flush_task - Remove dcache entries for @task from the /proc dcache.
3004 * @task: task that should be flushed.
3006 * When flushing dentries from proc, one needs to flush them from global
3007 * proc (proc_mnt) and from all the namespaces' procs this task was seen
3008 * in. This call is supposed to do all of this job.
3010 * Looks in the dcache for
3012 * /proc/@tgid/task/@pid
3013 * if either directory is present flushes it and all of it'ts children
3016 * It is safe and reasonable to cache /proc entries for a task until
3017 * that task exits. After that they just clog up the dcache with
3018 * useless entries, possibly causing useful dcache entries to be
3019 * flushed instead. This routine is proved to flush those useless
3020 * dcache entries at process exit time.
3022 * NOTE: This routine is just an optimization so it does not guarantee
3023 * that no dcache entries will exist at process exit time it
3024 * just makes it very unlikely that any will persist.
3027 void proc_flush_task(struct task_struct
*task
)
3030 struct pid
*pid
, *tgid
;
3033 pid
= task_pid(task
);
3034 tgid
= task_tgid(task
);
3036 for (i
= 0; i
<= pid
->level
; i
++) {
3037 upid
= &pid
->numbers
[i
];
3038 proc_flush_task_mnt(upid
->ns
->proc_mnt
, upid
->nr
,
3039 tgid
->numbers
[i
].nr
);
3043 static int proc_pid_instantiate(struct inode
*dir
,
3044 struct dentry
* dentry
,
3045 struct task_struct
*task
, const void *ptr
)
3047 struct inode
*inode
;
3049 inode
= proc_pid_make_inode(dir
->i_sb
, task
, S_IFDIR
| S_IRUGO
| S_IXUGO
);
3053 inode
->i_op
= &proc_tgid_base_inode_operations
;
3054 inode
->i_fop
= &proc_tgid_base_operations
;
3055 inode
->i_flags
|=S_IMMUTABLE
;
3057 set_nlink(inode
, nlink_tgid
);
3059 d_set_d_op(dentry
, &pid_dentry_operations
);
3061 d_add(dentry
, inode
);
3062 /* Close the race of the process dying before we return the dentry */
3063 if (pid_revalidate(dentry
, 0))
3069 struct dentry
*proc_pid_lookup(struct inode
*dir
, struct dentry
* dentry
, unsigned int flags
)
3071 int result
= -ENOENT
;
3072 struct task_struct
*task
;
3074 struct pid_namespace
*ns
;
3076 tgid
= name_to_int(&dentry
->d_name
);
3080 ns
= dentry
->d_sb
->s_fs_info
;
3082 task
= find_task_by_pid_ns(tgid
, ns
);
3084 get_task_struct(task
);
3089 result
= proc_pid_instantiate(dir
, dentry
, task
, NULL
);
3090 put_task_struct(task
);
3092 return ERR_PTR(result
);
3096 * Find the first task with tgid >= tgid
3101 struct task_struct
*task
;
3103 static struct tgid_iter
next_tgid(struct pid_namespace
*ns
, struct tgid_iter iter
)
3108 put_task_struct(iter
.task
);
3112 pid
= find_ge_pid(iter
.tgid
, ns
);
3114 iter
.tgid
= pid_nr_ns(pid
, ns
);
3115 iter
.task
= pid_task(pid
, PIDTYPE_PID
);
3116 /* What we to know is if the pid we have find is the
3117 * pid of a thread_group_leader. Testing for task
3118 * being a thread_group_leader is the obvious thing
3119 * todo but there is a window when it fails, due to
3120 * the pid transfer logic in de_thread.
3122 * So we perform the straight forward test of seeing
3123 * if the pid we have found is the pid of a thread
3124 * group leader, and don't worry if the task we have
3125 * found doesn't happen to be a thread group leader.
3126 * As we don't care in the case of readdir.
3128 if (!iter
.task
|| !has_group_leader_pid(iter
.task
)) {
3132 get_task_struct(iter
.task
);
3138 #define TGID_OFFSET (FIRST_PROCESS_ENTRY + 2)
3140 /* for the /proc/ directory itself, after non-process stuff has been done */
3141 int proc_pid_readdir(struct file
*file
, struct dir_context
*ctx
)
3143 struct tgid_iter iter
;
3144 struct pid_namespace
*ns
= file_inode(file
)->i_sb
->s_fs_info
;
3145 loff_t pos
= ctx
->pos
;
3147 if (pos
>= PID_MAX_LIMIT
+ TGID_OFFSET
)
3150 if (pos
== TGID_OFFSET
- 2) {
3151 struct inode
*inode
= d_inode(ns
->proc_self
);
3152 if (!dir_emit(ctx
, "self", 4, inode
->i_ino
, DT_LNK
))
3154 ctx
->pos
= pos
= pos
+ 1;
3156 if (pos
== TGID_OFFSET
- 1) {
3157 struct inode
*inode
= d_inode(ns
->proc_thread_self
);
3158 if (!dir_emit(ctx
, "thread-self", 11, inode
->i_ino
, DT_LNK
))
3160 ctx
->pos
= pos
= pos
+ 1;
3162 iter
.tgid
= pos
- TGID_OFFSET
;
3164 for (iter
= next_tgid(ns
, iter
);
3166 iter
.tgid
+= 1, iter
= next_tgid(ns
, iter
)) {
3167 char name
[PROC_NUMBUF
];
3171 if (!has_pid_permissions(ns
, iter
.task
, HIDEPID_INVISIBLE
))
3174 len
= snprintf(name
, sizeof(name
), "%d", iter
.tgid
);
3175 ctx
->pos
= iter
.tgid
+ TGID_OFFSET
;
3176 if (!proc_fill_cache(file
, ctx
, name
, len
,
3177 proc_pid_instantiate
, iter
.task
, NULL
)) {
3178 put_task_struct(iter
.task
);
3182 ctx
->pos
= PID_MAX_LIMIT
+ TGID_OFFSET
;
3187 * proc_tid_comm_permission is a special permission function exclusively
3188 * used for the node /proc/<pid>/task/<tid>/comm.
3189 * It bypasses generic permission checks in the case where a task of the same
3190 * task group attempts to access the node.
3191 * The rationale behind this is that glibc and bionic access this node for
3192 * cross thread naming (pthread_set/getname_np(!self)). However, if
3193 * PR_SET_DUMPABLE gets set to 0 this node among others becomes uid=0 gid=0,
3194 * which locks out the cross thread naming implementation.
3195 * This function makes sure that the node is always accessible for members of
3196 * same thread group.
3198 static int proc_tid_comm_permission(struct inode
*inode
, int mask
)
3200 bool is_same_tgroup
;
3201 struct task_struct
*task
;
3203 task
= get_proc_task(inode
);
3206 is_same_tgroup
= same_thread_group(current
, task
);
3207 put_task_struct(task
);
3209 if (likely(is_same_tgroup
&& !(mask
& MAY_EXEC
))) {
3210 /* This file (/proc/<pid>/task/<tid>/comm) can always be
3211 * read or written by the members of the corresponding
3217 return generic_permission(inode
, mask
);
3220 static const struct inode_operations proc_tid_comm_inode_operations
= {
3221 .permission
= proc_tid_comm_permission
,
3227 static const struct pid_entry tid_base_stuff
[] = {
3228 DIR("fd", S_IRUSR
|S_IXUSR
, proc_fd_inode_operations
, proc_fd_operations
),
3229 DIR("fdinfo", S_IRUSR
|S_IXUSR
, proc_fdinfo_inode_operations
, proc_fdinfo_operations
),
3230 DIR("ns", S_IRUSR
|S_IXUGO
, proc_ns_dir_inode_operations
, proc_ns_dir_operations
),
3232 DIR("net", S_IRUGO
|S_IXUGO
, proc_net_inode_operations
, proc_net_operations
),
3234 REG("environ", S_IRUSR
, proc_environ_operations
),
3235 REG("auxv", S_IRUSR
, proc_auxv_operations
),
3236 ONE("status", S_IRUGO
, proc_pid_status
),
3237 ONE("personality", S_IRUSR
, proc_pid_personality
),
3238 ONE("limits", S_IRUGO
, proc_pid_limits
),
3239 #ifdef CONFIG_SCHED_DEBUG
3240 REG("sched", S_IRUGO
|S_IWUSR
, proc_pid_sched_operations
),
3242 NOD("comm", S_IFREG
|S_IRUGO
|S_IWUSR
,
3243 &proc_tid_comm_inode_operations
,
3244 &proc_pid_set_comm_operations
, {}),
3245 #ifdef CONFIG_HAVE_ARCH_TRACEHOOK
3246 ONE("syscall", S_IRUSR
, proc_pid_syscall
),
3248 REG("cmdline", S_IRUGO
, proc_pid_cmdline_ops
),
3249 ONE("stat", S_IRUGO
, proc_tid_stat
),
3250 ONE("statm", S_IRUGO
, proc_pid_statm
),
3251 REG("maps", S_IRUGO
, proc_tid_maps_operations
),
3252 #ifdef CONFIG_PROC_CHILDREN
3253 REG("children", S_IRUGO
, proc_tid_children_operations
),
3256 REG("numa_maps", S_IRUGO
, proc_tid_numa_maps_operations
),
3258 REG("mem", S_IRUSR
|S_IWUSR
, proc_mem_operations
),
3259 LNK("cwd", proc_cwd_link
),
3260 LNK("root", proc_root_link
),
3261 LNK("exe", proc_exe_link
),
3262 REG("mounts", S_IRUGO
, proc_mounts_operations
),
3263 REG("mountinfo", S_IRUGO
, proc_mountinfo_operations
),
3264 #ifdef CONFIG_PROC_PAGE_MONITOR
3265 REG("clear_refs", S_IWUSR
, proc_clear_refs_operations
),
3266 REG("smaps", S_IRUGO
, proc_tid_smaps_operations
),
3267 REG("pagemap", S_IRUSR
, proc_pagemap_operations
),
3269 #ifdef CONFIG_SECURITY
3270 DIR("attr", S_IRUGO
|S_IXUGO
, proc_attr_dir_inode_operations
, proc_attr_dir_operations
),
3272 #ifdef CONFIG_KALLSYMS
3273 ONE("wchan", S_IRUGO
, proc_pid_wchan
),
3275 #ifdef CONFIG_STACKTRACE
3276 ONE("stack", S_IRUSR
, proc_pid_stack
),
3278 #ifdef CONFIG_SCHED_INFO
3279 ONE("schedstat", S_IRUGO
, proc_pid_schedstat
),
3281 #ifdef CONFIG_LATENCYTOP
3282 REG("latency", S_IRUGO
, proc_lstats_operations
),
3284 #ifdef CONFIG_PROC_PID_CPUSET
3285 ONE("cpuset", S_IRUGO
, proc_cpuset_show
),
3287 #ifdef CONFIG_CGROUPS
3288 ONE("cgroup", S_IRUGO
, proc_cgroup_show
),
3290 ONE("oom_score", S_IRUGO
, proc_oom_score
),
3291 REG("oom_adj", S_IRUGO
|S_IWUSR
, proc_oom_adj_operations
),
3292 REG("oom_score_adj", S_IRUGO
|S_IWUSR
, proc_oom_score_adj_operations
),
3293 #ifdef CONFIG_AUDITSYSCALL
3294 REG("loginuid", S_IWUSR
|S_IRUGO
, proc_loginuid_operations
),
3295 REG("sessionid", S_IRUGO
, proc_sessionid_operations
),
3297 #ifdef CONFIG_FAULT_INJECTION
3298 REG("make-it-fail", S_IRUGO
|S_IWUSR
, proc_fault_inject_operations
),
3300 #ifdef CONFIG_TASK_IO_ACCOUNTING
3301 ONE("io", S_IRUSR
, proc_tid_io_accounting
),
3303 #ifdef CONFIG_HARDWALL
3304 ONE("hardwall", S_IRUGO
, proc_pid_hardwall
),
3306 #ifdef CONFIG_USER_NS
3307 REG("uid_map", S_IRUGO
|S_IWUSR
, proc_uid_map_operations
),
3308 REG("gid_map", S_IRUGO
|S_IWUSR
, proc_gid_map_operations
),
3309 REG("projid_map", S_IRUGO
|S_IWUSR
, proc_projid_map_operations
),
3310 REG("setgroups", S_IRUGO
|S_IWUSR
, proc_setgroups_operations
),
3314 static int proc_tid_base_readdir(struct file
*file
, struct dir_context
*ctx
)
3316 return proc_pident_readdir(file
, ctx
,
3317 tid_base_stuff
, ARRAY_SIZE(tid_base_stuff
));
3320 static struct dentry
*proc_tid_base_lookup(struct inode
*dir
, struct dentry
*dentry
, unsigned int flags
)
3322 return proc_pident_lookup(dir
, dentry
,
3323 tid_base_stuff
, ARRAY_SIZE(tid_base_stuff
));
3326 static const struct file_operations proc_tid_base_operations
= {
3327 .read
= generic_read_dir
,
3328 .iterate_shared
= proc_tid_base_readdir
,
3329 .llseek
= generic_file_llseek
,
3332 static const struct inode_operations proc_tid_base_inode_operations
= {
3333 .lookup
= proc_tid_base_lookup
,
3334 .getattr
= pid_getattr
,
3335 .setattr
= proc_setattr
,
3338 static int proc_task_instantiate(struct inode
*dir
,
3339 struct dentry
*dentry
, struct task_struct
*task
, const void *ptr
)
3341 struct inode
*inode
;
3342 inode
= proc_pid_make_inode(dir
->i_sb
, task
, S_IFDIR
| S_IRUGO
| S_IXUGO
);
3346 inode
->i_op
= &proc_tid_base_inode_operations
;
3347 inode
->i_fop
= &proc_tid_base_operations
;
3348 inode
->i_flags
|=S_IMMUTABLE
;
3350 set_nlink(inode
, nlink_tid
);
3352 d_set_d_op(dentry
, &pid_dentry_operations
);
3354 d_add(dentry
, inode
);
3355 /* Close the race of the process dying before we return the dentry */
3356 if (pid_revalidate(dentry
, 0))
3362 static struct dentry
*proc_task_lookup(struct inode
*dir
, struct dentry
* dentry
, unsigned int flags
)
3364 int result
= -ENOENT
;
3365 struct task_struct
*task
;
3366 struct task_struct
*leader
= get_proc_task(dir
);
3368 struct pid_namespace
*ns
;
3373 tid
= name_to_int(&dentry
->d_name
);
3377 ns
= dentry
->d_sb
->s_fs_info
;
3379 task
= find_task_by_pid_ns(tid
, ns
);
3381 get_task_struct(task
);
3385 if (!same_thread_group(leader
, task
))
3388 result
= proc_task_instantiate(dir
, dentry
, task
, NULL
);
3390 put_task_struct(task
);
3392 put_task_struct(leader
);
3394 return ERR_PTR(result
);
3398 * Find the first tid of a thread group to return to user space.
3400 * Usually this is just the thread group leader, but if the users
3401 * buffer was too small or there was a seek into the middle of the
3402 * directory we have more work todo.
3404 * In the case of a short read we start with find_task_by_pid.
3406 * In the case of a seek we start with the leader and walk nr
3409 static struct task_struct
*first_tid(struct pid
*pid
, int tid
, loff_t f_pos
,
3410 struct pid_namespace
*ns
)
3412 struct task_struct
*pos
, *task
;
3413 unsigned long nr
= f_pos
;
3415 if (nr
!= f_pos
) /* 32bit overflow? */
3419 task
= pid_task(pid
, PIDTYPE_PID
);
3423 /* Attempt to start with the tid of a thread */
3425 pos
= find_task_by_pid_ns(tid
, ns
);
3426 if (pos
&& same_thread_group(pos
, task
))
3430 /* If nr exceeds the number of threads there is nothing todo */
3431 if (nr
>= get_nr_threads(task
))
3434 /* If we haven't found our starting place yet start
3435 * with the leader and walk nr threads forward.
3437 pos
= task
= task
->group_leader
;
3441 } while_each_thread(task
, pos
);
3446 get_task_struct(pos
);
3453 * Find the next thread in the thread list.
3454 * Return NULL if there is an error or no next thread.
3456 * The reference to the input task_struct is released.
3458 static struct task_struct
*next_tid(struct task_struct
*start
)
3460 struct task_struct
*pos
= NULL
;
3462 if (pid_alive(start
)) {
3463 pos
= next_thread(start
);
3464 if (thread_group_leader(pos
))
3467 get_task_struct(pos
);
3470 put_task_struct(start
);
3474 /* for the /proc/TGID/task/ directories */
3475 static int proc_task_readdir(struct file
*file
, struct dir_context
*ctx
)
3477 struct inode
*inode
= file_inode(file
);
3478 struct task_struct
*task
;
3479 struct pid_namespace
*ns
;
3482 if (proc_inode_is_dead(inode
))
3485 if (!dir_emit_dots(file
, ctx
))
3488 /* f_version caches the tgid value that the last readdir call couldn't
3489 * return. lseek aka telldir automagically resets f_version to 0.
3491 ns
= inode
->i_sb
->s_fs_info
;
3492 tid
= (int)file
->f_version
;
3493 file
->f_version
= 0;
3494 for (task
= first_tid(proc_pid(inode
), tid
, ctx
->pos
- 2, ns
);
3496 task
= next_tid(task
), ctx
->pos
++) {
3497 char name
[PROC_NUMBUF
];
3499 tid
= task_pid_nr_ns(task
, ns
);
3500 len
= snprintf(name
, sizeof(name
), "%d", tid
);
3501 if (!proc_fill_cache(file
, ctx
, name
, len
,
3502 proc_task_instantiate
, task
, NULL
)) {
3503 /* returning this tgid failed, save it as the first
3504 * pid for the next readir call */
3505 file
->f_version
= (u64
)tid
;
3506 put_task_struct(task
);
3514 static int proc_task_getattr(struct vfsmount
*mnt
, struct dentry
*dentry
, struct kstat
*stat
)
3516 struct inode
*inode
= d_inode(dentry
);
3517 struct task_struct
*p
= get_proc_task(inode
);
3518 generic_fillattr(inode
, stat
);
3521 stat
->nlink
+= get_nr_threads(p
);
3528 static const struct inode_operations proc_task_inode_operations
= {
3529 .lookup
= proc_task_lookup
,
3530 .getattr
= proc_task_getattr
,
3531 .setattr
= proc_setattr
,
3532 .permission
= proc_pid_permission
,
3535 static const struct file_operations proc_task_operations
= {
3536 .read
= generic_read_dir
,
3537 .iterate_shared
= proc_task_readdir
,
3538 .llseek
= generic_file_llseek
,
3541 void __init
set_proc_pid_nlink(void)
3543 nlink_tid
= pid_entry_nlink(tid_base_stuff
, ARRAY_SIZE(tid_base_stuff
));
3544 nlink_tgid
= pid_entry_nlink(tgid_base_stuff
, ARRAY_SIZE(tgid_base_stuff
));