4 * Copyright (C) 1991, 1992 Linus Torvalds
6 * proc base directory handling functions
8 * 1999, Al Viro. Rewritten. Now it covers the whole per-process part.
9 * Instead of using magical inumbers to determine the kind of object
10 * we allocate and fill in-core inodes upon lookup. They don't even
11 * go into icache. We cache the reference to task_struct upon lookup too.
12 * Eventually it should become a filesystem in its own. We don't use the
13 * rest of procfs anymore.
19 * Bruna Moreira <bruna.moreira@indt.org.br>
20 * Edjard Mota <edjard.mota@indt.org.br>
21 * Ilias Biris <ilias.biris@indt.org.br>
22 * Mauricio Lin <mauricio.lin@indt.org.br>
24 * Embedded Linux Lab - 10LE Instituto Nokia de Tecnologia - INdT
26 * A new process specific entry (smaps) included in /proc. It shows the
27 * size of rss for each memory area. The maps entry lacks information
28 * about physical memory size (rss) for each mapped file, i.e.,
29 * rss information for executables and library files.
30 * This additional information is useful for any tools that need to know
31 * about physical memory consumption for a process specific library.
35 * Embedded Linux Lab - 10LE Instituto Nokia de Tecnologia - INdT
36 * Pud inclusion in the page table walking.
40 * 10LE Instituto Nokia de Tecnologia - INdT:
41 * A better way to walks through the page table as suggested by Hugh Dickins.
43 * Simo Piiroinen <simo.piiroinen@nokia.com>:
44 * Smaps information related to shared, private, clean and dirty pages.
46 * Paul Mundt <paul.mundt@nokia.com>:
47 * Overall revision about smaps.
50 #include <asm/uaccess.h>
52 #include <linux/errno.h>
53 #include <linux/time.h>
54 #include <linux/proc_fs.h>
55 #include <linux/stat.h>
56 #include <linux/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.
111 const struct inode_operations
*iop
;
112 const struct file_operations
*fop
;
116 #define NOD(NAME, MODE, IOP, FOP, OP) { \
118 .len = sizeof(NAME) - 1, \
125 #define DIR(NAME, MODE, iops, fops) \
126 NOD(NAME, (S_IFDIR|(MODE)), &iops, &fops, {} )
127 #define LNK(NAME, get_link) \
128 NOD(NAME, (S_IFLNK|S_IRWXUGO), \
129 &proc_pid_link_inode_operations, NULL, \
130 { .proc_get_link = get_link } )
131 #define REG(NAME, MODE, fops) \
132 NOD(NAME, (S_IFREG|(MODE)), NULL, &fops, {})
133 #define ONE(NAME, MODE, show) \
134 NOD(NAME, (S_IFREG|(MODE)), \
135 NULL, &proc_single_file_operations, \
136 { .proc_show = show } )
139 * Count the number of hardlinks for the pid_entry table, excluding the .
142 static unsigned int pid_entry_count_dirs(const struct pid_entry
*entries
,
149 for (i
= 0; i
< n
; ++i
) {
150 if (S_ISDIR(entries
[i
].mode
))
157 static int get_task_root(struct task_struct
*task
, struct path
*root
)
159 int result
= -ENOENT
;
163 get_fs_root(task
->fs
, root
);
170 static int proc_cwd_link(struct dentry
*dentry
, struct path
*path
)
172 struct task_struct
*task
= get_proc_task(d_inode(dentry
));
173 int result
= -ENOENT
;
178 get_fs_pwd(task
->fs
, path
);
182 put_task_struct(task
);
187 static int proc_root_link(struct dentry
*dentry
, struct path
*path
)
189 struct task_struct
*task
= get_proc_task(d_inode(dentry
));
190 int result
= -ENOENT
;
193 result
= get_task_root(task
, path
);
194 put_task_struct(task
);
199 static ssize_t
proc_pid_cmdline_read(struct file
*file
, char __user
*buf
,
200 size_t _count
, loff_t
*pos
)
202 struct task_struct
*tsk
;
203 struct mm_struct
*mm
;
205 unsigned long count
= _count
;
206 unsigned long arg_start
, arg_end
, env_start
, env_end
;
207 unsigned long len1
, len2
, len
;
214 tsk
= get_proc_task(file_inode(file
));
217 mm
= get_task_mm(tsk
);
218 put_task_struct(tsk
);
221 /* Check if process spawned far enough to have cmdline. */
227 page
= (char *)__get_free_page(GFP_TEMPORARY
);
233 down_read(&mm
->mmap_sem
);
234 arg_start
= mm
->arg_start
;
235 arg_end
= mm
->arg_end
;
236 env_start
= mm
->env_start
;
237 env_end
= mm
->env_end
;
238 up_read(&mm
->mmap_sem
);
240 BUG_ON(arg_start
> arg_end
);
241 BUG_ON(env_start
> env_end
);
243 len1
= arg_end
- arg_start
;
244 len2
= env_end
- env_start
;
252 * Inherently racy -- command line shares address space
253 * with code and data.
255 rv
= access_remote_vm(mm
, arg_end
- 1, &c
, 1, 0);
262 /* Command line (set of strings) occupies whole ARGV. */
266 p
= arg_start
+ *pos
;
268 while (count
> 0 && len
> 0) {
272 _count
= min3(count
, len
, PAGE_SIZE
);
273 nr_read
= access_remote_vm(mm
, p
, page
, _count
, 0);
279 if (copy_to_user(buf
, page
, nr_read
)) {
292 * Command line (1 string) occupies ARGV and maybe
295 if (len1
+ len2
<= *pos
)
300 p
= arg_start
+ *pos
;
302 while (count
> 0 && len
> 0) {
303 unsigned int _count
, l
;
307 _count
= min3(count
, len
, PAGE_SIZE
);
308 nr_read
= access_remote_vm(mm
, p
, page
, _count
, 0);
315 * Command line can be shorter than whole ARGV
316 * even if last "marker" byte says it is not.
319 l
= strnlen(page
, nr_read
);
325 if (copy_to_user(buf
, page
, nr_read
)) {
341 * Command line (1 string) occupies ARGV and
345 p
= env_start
+ *pos
- len1
;
346 len
= len1
+ len2
- *pos
;
351 while (count
> 0 && len
> 0) {
352 unsigned int _count
, l
;
356 _count
= min3(count
, len
, PAGE_SIZE
);
357 nr_read
= access_remote_vm(mm
, p
, page
, _count
, 0);
365 l
= strnlen(page
, nr_read
);
371 if (copy_to_user(buf
, page
, nr_read
)) {
390 free_page((unsigned long)page
);
398 static const struct file_operations proc_pid_cmdline_ops
= {
399 .read
= proc_pid_cmdline_read
,
400 .llseek
= generic_file_llseek
,
403 #ifdef CONFIG_KALLSYMS
405 * Provides a wchan file via kallsyms in a proper one-value-per-file format.
406 * Returns the resolved symbol. If that fails, simply return the address.
408 static int proc_pid_wchan(struct seq_file
*m
, struct pid_namespace
*ns
,
409 struct pid
*pid
, struct task_struct
*task
)
412 char symname
[KSYM_NAME_LEN
];
414 wchan
= get_wchan(task
);
416 if (wchan
&& ptrace_may_access(task
, PTRACE_MODE_READ_FSCREDS
)
417 && !lookup_symbol_name(wchan
, symname
))
418 seq_printf(m
, "%s", symname
);
424 #endif /* CONFIG_KALLSYMS */
426 static int lock_trace(struct task_struct
*task
)
428 int err
= mutex_lock_killable(&task
->signal
->cred_guard_mutex
);
431 if (!ptrace_may_access(task
, PTRACE_MODE_ATTACH_FSCREDS
)) {
432 mutex_unlock(&task
->signal
->cred_guard_mutex
);
438 static void unlock_trace(struct task_struct
*task
)
440 mutex_unlock(&task
->signal
->cred_guard_mutex
);
443 #ifdef CONFIG_STACKTRACE
445 #define MAX_STACK_TRACE_DEPTH 64
447 static int proc_pid_stack(struct seq_file
*m
, struct pid_namespace
*ns
,
448 struct pid
*pid
, struct task_struct
*task
)
450 struct stack_trace trace
;
451 unsigned long *entries
;
455 entries
= kmalloc(MAX_STACK_TRACE_DEPTH
* sizeof(*entries
), GFP_KERNEL
);
459 trace
.nr_entries
= 0;
460 trace
.max_entries
= MAX_STACK_TRACE_DEPTH
;
461 trace
.entries
= entries
;
464 err
= lock_trace(task
);
466 save_stack_trace_tsk(task
, &trace
);
468 for (i
= 0; i
< trace
.nr_entries
; i
++) {
469 seq_printf(m
, "[<%pK>] %pB\n",
470 (void *)entries
[i
], (void *)entries
[i
]);
480 #ifdef CONFIG_SCHED_INFO
482 * Provides /proc/PID/schedstat
484 static int proc_pid_schedstat(struct seq_file
*m
, struct pid_namespace
*ns
,
485 struct pid
*pid
, struct task_struct
*task
)
487 if (unlikely(!sched_info_on()))
488 seq_printf(m
, "0 0 0\n");
490 seq_printf(m
, "%llu %llu %lu\n",
491 (unsigned long long)task
->se
.sum_exec_runtime
,
492 (unsigned long long)task
->sched_info
.run_delay
,
493 task
->sched_info
.pcount
);
499 #ifdef CONFIG_LATENCYTOP
500 static int lstats_show_proc(struct seq_file
*m
, void *v
)
503 struct inode
*inode
= m
->private;
504 struct task_struct
*task
= get_proc_task(inode
);
508 seq_puts(m
, "Latency Top version : v0.1\n");
509 for (i
= 0; i
< 32; i
++) {
510 struct latency_record
*lr
= &task
->latency_record
[i
];
511 if (lr
->backtrace
[0]) {
513 seq_printf(m
, "%i %li %li",
514 lr
->count
, lr
->time
, lr
->max
);
515 for (q
= 0; q
< LT_BACKTRACEDEPTH
; q
++) {
516 unsigned long bt
= lr
->backtrace
[q
];
521 seq_printf(m
, " %ps", (void *)bt
);
527 put_task_struct(task
);
531 static int lstats_open(struct inode
*inode
, struct file
*file
)
533 return single_open(file
, lstats_show_proc
, inode
);
536 static ssize_t
lstats_write(struct file
*file
, const char __user
*buf
,
537 size_t count
, loff_t
*offs
)
539 struct task_struct
*task
= get_proc_task(file_inode(file
));
543 clear_all_latency_tracing(task
);
544 put_task_struct(task
);
549 static const struct file_operations proc_lstats_operations
= {
552 .write
= lstats_write
,
554 .release
= single_release
,
559 static int proc_oom_score(struct seq_file
*m
, struct pid_namespace
*ns
,
560 struct pid
*pid
, struct task_struct
*task
)
562 unsigned long totalpages
= totalram_pages
+ total_swap_pages
;
563 unsigned long points
= 0;
565 points
= oom_badness(task
, NULL
, NULL
, totalpages
) *
567 seq_printf(m
, "%lu\n", points
);
577 static const struct limit_names lnames
[RLIM_NLIMITS
] = {
578 [RLIMIT_CPU
] = {"Max cpu time", "seconds"},
579 [RLIMIT_FSIZE
] = {"Max file size", "bytes"},
580 [RLIMIT_DATA
] = {"Max data size", "bytes"},
581 [RLIMIT_STACK
] = {"Max stack size", "bytes"},
582 [RLIMIT_CORE
] = {"Max core file size", "bytes"},
583 [RLIMIT_RSS
] = {"Max resident set", "bytes"},
584 [RLIMIT_NPROC
] = {"Max processes", "processes"},
585 [RLIMIT_NOFILE
] = {"Max open files", "files"},
586 [RLIMIT_MEMLOCK
] = {"Max locked memory", "bytes"},
587 [RLIMIT_AS
] = {"Max address space", "bytes"},
588 [RLIMIT_LOCKS
] = {"Max file locks", "locks"},
589 [RLIMIT_SIGPENDING
] = {"Max pending signals", "signals"},
590 [RLIMIT_MSGQUEUE
] = {"Max msgqueue size", "bytes"},
591 [RLIMIT_NICE
] = {"Max nice priority", NULL
},
592 [RLIMIT_RTPRIO
] = {"Max realtime priority", NULL
},
593 [RLIMIT_RTTIME
] = {"Max realtime timeout", "us"},
596 /* Display limits for a process */
597 static int proc_pid_limits(struct seq_file
*m
, struct pid_namespace
*ns
,
598 struct pid
*pid
, struct task_struct
*task
)
603 struct rlimit rlim
[RLIM_NLIMITS
];
605 if (!lock_task_sighand(task
, &flags
))
607 memcpy(rlim
, task
->signal
->rlim
, sizeof(struct rlimit
) * RLIM_NLIMITS
);
608 unlock_task_sighand(task
, &flags
);
611 * print the file header
613 seq_printf(m
, "%-25s %-20s %-20s %-10s\n",
614 "Limit", "Soft Limit", "Hard Limit", "Units");
616 for (i
= 0; i
< RLIM_NLIMITS
; i
++) {
617 if (rlim
[i
].rlim_cur
== RLIM_INFINITY
)
618 seq_printf(m
, "%-25s %-20s ",
619 lnames
[i
].name
, "unlimited");
621 seq_printf(m
, "%-25s %-20lu ",
622 lnames
[i
].name
, rlim
[i
].rlim_cur
);
624 if (rlim
[i
].rlim_max
== RLIM_INFINITY
)
625 seq_printf(m
, "%-20s ", "unlimited");
627 seq_printf(m
, "%-20lu ", rlim
[i
].rlim_max
);
630 seq_printf(m
, "%-10s\n", lnames
[i
].unit
);
638 #ifdef CONFIG_HAVE_ARCH_TRACEHOOK
639 static int proc_pid_syscall(struct seq_file
*m
, struct pid_namespace
*ns
,
640 struct pid
*pid
, struct task_struct
*task
)
643 unsigned long args
[6], sp
, pc
;
646 res
= lock_trace(task
);
650 if (task_current_syscall(task
, &nr
, args
, 6, &sp
, &pc
))
651 seq_puts(m
, "running\n");
653 seq_printf(m
, "%ld 0x%lx 0x%lx\n", nr
, sp
, pc
);
656 "%ld 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx\n",
658 args
[0], args
[1], args
[2], args
[3], args
[4], args
[5],
664 #endif /* CONFIG_HAVE_ARCH_TRACEHOOK */
666 /************************************************************************/
667 /* Here the fs part begins */
668 /************************************************************************/
670 /* permission checks */
671 static int proc_fd_access_allowed(struct inode
*inode
)
673 struct task_struct
*task
;
675 /* Allow access to a task's file descriptors if it is us or we
676 * may use ptrace attach to the process and find out that
679 task
= get_proc_task(inode
);
681 allowed
= ptrace_may_access(task
, PTRACE_MODE_READ_FSCREDS
);
682 put_task_struct(task
);
687 int proc_setattr(struct dentry
*dentry
, struct iattr
*attr
)
690 struct inode
*inode
= d_inode(dentry
);
692 if (attr
->ia_valid
& ATTR_MODE
)
695 error
= setattr_prepare(dentry
, attr
);
699 setattr_copy(inode
, attr
);
700 mark_inode_dirty(inode
);
705 * May current process learn task's sched/cmdline info (for hide_pid_min=1)
706 * or euid/egid (for hide_pid_min=2)?
708 static bool has_pid_permissions(struct pid_namespace
*pid
,
709 struct task_struct
*task
,
712 if (pid
->hide_pid
< hide_pid_min
)
714 if (in_group_p(pid
->pid_gid
))
716 return ptrace_may_access(task
, PTRACE_MODE_READ_FSCREDS
);
720 static int proc_pid_permission(struct inode
*inode
, int mask
)
722 struct pid_namespace
*pid
= inode
->i_sb
->s_fs_info
;
723 struct task_struct
*task
;
726 task
= get_proc_task(inode
);
729 has_perms
= has_pid_permissions(pid
, task
, 1);
730 put_task_struct(task
);
733 if (pid
->hide_pid
== 2) {
735 * Let's make getdents(), stat(), and open()
736 * consistent with each other. If a process
737 * may not stat() a file, it shouldn't be seen
745 return generic_permission(inode
, mask
);
750 static const struct inode_operations proc_def_inode_operations
= {
751 .setattr
= proc_setattr
,
754 static int proc_single_show(struct seq_file
*m
, void *v
)
756 struct inode
*inode
= m
->private;
757 struct pid_namespace
*ns
;
759 struct task_struct
*task
;
762 ns
= inode
->i_sb
->s_fs_info
;
763 pid
= proc_pid(inode
);
764 task
= get_pid_task(pid
, PIDTYPE_PID
);
768 ret
= PROC_I(inode
)->op
.proc_show(m
, ns
, pid
, task
);
770 put_task_struct(task
);
774 static int proc_single_open(struct inode
*inode
, struct file
*filp
)
776 return single_open(filp
, proc_single_show
, inode
);
779 static const struct file_operations proc_single_file_operations
= {
780 .open
= proc_single_open
,
783 .release
= single_release
,
787 struct mm_struct
*proc_mem_open(struct inode
*inode
, unsigned int mode
)
789 struct task_struct
*task
= get_proc_task(inode
);
790 struct mm_struct
*mm
= ERR_PTR(-ESRCH
);
793 mm
= mm_access(task
, mode
| PTRACE_MODE_FSCREDS
);
794 put_task_struct(task
);
796 if (!IS_ERR_OR_NULL(mm
)) {
797 /* ensure this mm_struct can't be freed */
798 atomic_inc(&mm
->mm_count
);
799 /* but do not pin its memory */
807 static int __mem_open(struct inode
*inode
, struct file
*file
, unsigned int mode
)
809 struct mm_struct
*mm
= proc_mem_open(inode
, mode
);
814 file
->private_data
= mm
;
818 static int mem_open(struct inode
*inode
, struct file
*file
)
820 int ret
= __mem_open(inode
, file
, PTRACE_MODE_ATTACH
);
822 /* OK to pass negative loff_t, we can catch out-of-range */
823 file
->f_mode
|= FMODE_UNSIGNED_OFFSET
;
828 static ssize_t
mem_rw(struct file
*file
, char __user
*buf
,
829 size_t count
, loff_t
*ppos
, int write
)
831 struct mm_struct
*mm
= file
->private_data
;
832 unsigned long addr
= *ppos
;
839 page
= (char *)__get_free_page(GFP_TEMPORARY
);
844 if (!atomic_inc_not_zero(&mm
->mm_users
))
848 int this_len
= min_t(int, count
, PAGE_SIZE
);
850 if (write
&& copy_from_user(page
, buf
, this_len
)) {
855 this_len
= access_remote_vm(mm
, addr
, page
, this_len
, write
);
862 if (!write
&& copy_to_user(buf
, page
, this_len
)) {
876 free_page((unsigned long) page
);
880 static ssize_t
mem_read(struct file
*file
, char __user
*buf
,
881 size_t count
, loff_t
*ppos
)
883 return mem_rw(file
, buf
, count
, ppos
, 0);
886 static ssize_t
mem_write(struct file
*file
, const char __user
*buf
,
887 size_t count
, loff_t
*ppos
)
889 return mem_rw(file
, (char __user
*)buf
, count
, ppos
, 1);
892 loff_t
mem_lseek(struct file
*file
, loff_t offset
, int orig
)
896 file
->f_pos
= offset
;
899 file
->f_pos
+= offset
;
904 force_successful_syscall_return();
908 static int mem_release(struct inode
*inode
, struct file
*file
)
910 struct mm_struct
*mm
= file
->private_data
;
916 static const struct file_operations proc_mem_operations
= {
921 .release
= mem_release
,
924 static int environ_open(struct inode
*inode
, struct file
*file
)
926 return __mem_open(inode
, file
, PTRACE_MODE_READ
);
929 static ssize_t
environ_read(struct file
*file
, char __user
*buf
,
930 size_t count
, loff_t
*ppos
)
933 unsigned long src
= *ppos
;
935 struct mm_struct
*mm
= file
->private_data
;
936 unsigned long env_start
, env_end
;
938 /* Ensure the process spawned far enough to have an environment. */
939 if (!mm
|| !mm
->env_end
)
942 page
= (char *)__get_free_page(GFP_TEMPORARY
);
947 if (!atomic_inc_not_zero(&mm
->mm_users
))
950 down_read(&mm
->mmap_sem
);
951 env_start
= mm
->env_start
;
952 env_end
= mm
->env_end
;
953 up_read(&mm
->mmap_sem
);
956 size_t this_len
, max_len
;
959 if (src
>= (env_end
- env_start
))
962 this_len
= env_end
- (env_start
+ src
);
964 max_len
= min_t(size_t, PAGE_SIZE
, count
);
965 this_len
= min(max_len
, this_len
);
967 retval
= access_remote_vm(mm
, (env_start
+ src
),
975 if (copy_to_user(buf
, page
, retval
)) {
989 free_page((unsigned long) page
);
993 static const struct file_operations proc_environ_operations
= {
994 .open
= environ_open
,
995 .read
= environ_read
,
996 .llseek
= generic_file_llseek
,
997 .release
= mem_release
,
1000 static int auxv_open(struct inode
*inode
, struct file
*file
)
1002 return __mem_open(inode
, file
, PTRACE_MODE_READ_FSCREDS
);
1005 static ssize_t
auxv_read(struct file
*file
, char __user
*buf
,
1006 size_t count
, loff_t
*ppos
)
1008 struct mm_struct
*mm
= file
->private_data
;
1009 unsigned int nwords
= 0;
1012 } while (mm
->saved_auxv
[nwords
- 2] != 0); /* AT_NULL */
1013 return simple_read_from_buffer(buf
, count
, ppos
, mm
->saved_auxv
,
1014 nwords
* sizeof(mm
->saved_auxv
[0]));
1017 static const struct file_operations proc_auxv_operations
= {
1020 .llseek
= generic_file_llseek
,
1021 .release
= mem_release
,
1024 static ssize_t
oom_adj_read(struct file
*file
, char __user
*buf
, size_t count
,
1027 struct task_struct
*task
= get_proc_task(file_inode(file
));
1028 char buffer
[PROC_NUMBUF
];
1029 int oom_adj
= OOM_ADJUST_MIN
;
1034 if (task
->signal
->oom_score_adj
== OOM_SCORE_ADJ_MAX
)
1035 oom_adj
= OOM_ADJUST_MAX
;
1037 oom_adj
= (task
->signal
->oom_score_adj
* -OOM_DISABLE
) /
1039 put_task_struct(task
);
1040 len
= snprintf(buffer
, sizeof(buffer
), "%d\n", oom_adj
);
1041 return simple_read_from_buffer(buf
, count
, ppos
, buffer
, len
);
1044 static int __set_oom_adj(struct file
*file
, int oom_adj
, bool legacy
)
1046 static DEFINE_MUTEX(oom_adj_mutex
);
1047 struct mm_struct
*mm
= NULL
;
1048 struct task_struct
*task
;
1051 task
= get_proc_task(file_inode(file
));
1055 mutex_lock(&oom_adj_mutex
);
1057 if (oom_adj
< task
->signal
->oom_score_adj
&&
1058 !capable(CAP_SYS_RESOURCE
)) {
1063 * /proc/pid/oom_adj is provided for legacy purposes, ask users to use
1064 * /proc/pid/oom_score_adj instead.
1066 pr_warn_once("%s (%d): /proc/%d/oom_adj is deprecated, please use /proc/%d/oom_score_adj instead.\n",
1067 current
->comm
, task_pid_nr(current
), task_pid_nr(task
),
1070 if ((short)oom_adj
< task
->signal
->oom_score_adj_min
&&
1071 !capable(CAP_SYS_RESOURCE
)) {
1078 * Make sure we will check other processes sharing the mm if this is
1079 * not vfrok which wants its own oom_score_adj.
1080 * pin the mm so it doesn't go away and get reused after task_unlock
1082 if (!task
->vfork_done
) {
1083 struct task_struct
*p
= find_lock_task_mm(task
);
1086 if (atomic_read(&p
->mm
->mm_users
) > 1) {
1088 atomic_inc(&mm
->mm_count
);
1094 task
->signal
->oom_score_adj
= oom_adj
;
1095 if (!legacy
&& has_capability_noaudit(current
, CAP_SYS_RESOURCE
))
1096 task
->signal
->oom_score_adj_min
= (short)oom_adj
;
1097 trace_oom_score_adj_update(task
);
1100 struct task_struct
*p
;
1103 for_each_process(p
) {
1104 if (same_thread_group(task
, p
))
1107 /* do not touch kernel threads or the global init */
1108 if (p
->flags
& PF_KTHREAD
|| is_global_init(p
))
1112 if (!p
->vfork_done
&& process_shares_mm(p
, mm
)) {
1113 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",
1114 task_pid_nr(p
), p
->comm
,
1115 p
->signal
->oom_score_adj
, oom_adj
,
1116 task_pid_nr(task
), task
->comm
);
1117 p
->signal
->oom_score_adj
= oom_adj
;
1118 if (!legacy
&& has_capability_noaudit(current
, CAP_SYS_RESOURCE
))
1119 p
->signal
->oom_score_adj_min
= (short)oom_adj
;
1127 mutex_unlock(&oom_adj_mutex
);
1128 put_task_struct(task
);
1133 * /proc/pid/oom_adj exists solely for backwards compatibility with previous
1134 * kernels. The effective policy is defined by oom_score_adj, which has a
1135 * different scale: oom_adj grew exponentially and oom_score_adj grows linearly.
1136 * Values written to oom_adj are simply mapped linearly to oom_score_adj.
1137 * Processes that become oom disabled via oom_adj will still be oom disabled
1138 * with this implementation.
1140 * oom_adj cannot be removed since existing userspace binaries use it.
1142 static ssize_t
oom_adj_write(struct file
*file
, const char __user
*buf
,
1143 size_t count
, loff_t
*ppos
)
1145 char buffer
[PROC_NUMBUF
];
1149 memset(buffer
, 0, sizeof(buffer
));
1150 if (count
> sizeof(buffer
) - 1)
1151 count
= sizeof(buffer
) - 1;
1152 if (copy_from_user(buffer
, buf
, count
)) {
1157 err
= kstrtoint(strstrip(buffer
), 0, &oom_adj
);
1160 if ((oom_adj
< OOM_ADJUST_MIN
|| oom_adj
> OOM_ADJUST_MAX
) &&
1161 oom_adj
!= OOM_DISABLE
) {
1167 * Scale /proc/pid/oom_score_adj appropriately ensuring that a maximum
1168 * value is always attainable.
1170 if (oom_adj
== OOM_ADJUST_MAX
)
1171 oom_adj
= OOM_SCORE_ADJ_MAX
;
1173 oom_adj
= (oom_adj
* OOM_SCORE_ADJ_MAX
) / -OOM_DISABLE
;
1175 err
= __set_oom_adj(file
, oom_adj
, true);
1177 return err
< 0 ? err
: count
;
1180 static const struct file_operations proc_oom_adj_operations
= {
1181 .read
= oom_adj_read
,
1182 .write
= oom_adj_write
,
1183 .llseek
= generic_file_llseek
,
1186 static ssize_t
oom_score_adj_read(struct file
*file
, char __user
*buf
,
1187 size_t count
, loff_t
*ppos
)
1189 struct task_struct
*task
= get_proc_task(file_inode(file
));
1190 char buffer
[PROC_NUMBUF
];
1191 short oom_score_adj
= OOM_SCORE_ADJ_MIN
;
1196 oom_score_adj
= task
->signal
->oom_score_adj
;
1197 put_task_struct(task
);
1198 len
= snprintf(buffer
, sizeof(buffer
), "%hd\n", oom_score_adj
);
1199 return simple_read_from_buffer(buf
, count
, ppos
, buffer
, len
);
1202 static ssize_t
oom_score_adj_write(struct file
*file
, const char __user
*buf
,
1203 size_t count
, loff_t
*ppos
)
1205 char buffer
[PROC_NUMBUF
];
1209 memset(buffer
, 0, sizeof(buffer
));
1210 if (count
> sizeof(buffer
) - 1)
1211 count
= sizeof(buffer
) - 1;
1212 if (copy_from_user(buffer
, buf
, count
)) {
1217 err
= kstrtoint(strstrip(buffer
), 0, &oom_score_adj
);
1220 if (oom_score_adj
< OOM_SCORE_ADJ_MIN
||
1221 oom_score_adj
> OOM_SCORE_ADJ_MAX
) {
1226 err
= __set_oom_adj(file
, oom_score_adj
, false);
1228 return err
< 0 ? err
: count
;
1231 static const struct file_operations proc_oom_score_adj_operations
= {
1232 .read
= oom_score_adj_read
,
1233 .write
= oom_score_adj_write
,
1234 .llseek
= default_llseek
,
1237 #ifdef CONFIG_AUDITSYSCALL
1238 #define TMPBUFLEN 21
1239 static ssize_t
proc_loginuid_read(struct file
* file
, char __user
* buf
,
1240 size_t count
, loff_t
*ppos
)
1242 struct inode
* inode
= file_inode(file
);
1243 struct task_struct
*task
= get_proc_task(inode
);
1245 char tmpbuf
[TMPBUFLEN
];
1249 length
= scnprintf(tmpbuf
, TMPBUFLEN
, "%u",
1250 from_kuid(file
->f_cred
->user_ns
,
1251 audit_get_loginuid(task
)));
1252 put_task_struct(task
);
1253 return simple_read_from_buffer(buf
, count
, ppos
, tmpbuf
, length
);
1256 static ssize_t
proc_loginuid_write(struct file
* file
, const char __user
* buf
,
1257 size_t count
, loff_t
*ppos
)
1259 struct inode
* inode
= file_inode(file
);
1265 if (current
!= pid_task(proc_pid(inode
), PIDTYPE_PID
)) {
1272 /* No partial writes. */
1276 rv
= kstrtou32_from_user(buf
, count
, 10, &loginuid
);
1280 /* is userspace tring to explicitly UNSET the loginuid? */
1281 if (loginuid
== AUDIT_UID_UNSET
) {
1282 kloginuid
= INVALID_UID
;
1284 kloginuid
= make_kuid(file
->f_cred
->user_ns
, loginuid
);
1285 if (!uid_valid(kloginuid
))
1289 rv
= audit_set_loginuid(kloginuid
);
1295 static const struct file_operations proc_loginuid_operations
= {
1296 .read
= proc_loginuid_read
,
1297 .write
= proc_loginuid_write
,
1298 .llseek
= generic_file_llseek
,
1301 static ssize_t
proc_sessionid_read(struct file
* file
, char __user
* buf
,
1302 size_t count
, loff_t
*ppos
)
1304 struct inode
* inode
= file_inode(file
);
1305 struct task_struct
*task
= get_proc_task(inode
);
1307 char tmpbuf
[TMPBUFLEN
];
1311 length
= scnprintf(tmpbuf
, TMPBUFLEN
, "%u",
1312 audit_get_sessionid(task
));
1313 put_task_struct(task
);
1314 return simple_read_from_buffer(buf
, count
, ppos
, tmpbuf
, length
);
1317 static const struct file_operations proc_sessionid_operations
= {
1318 .read
= proc_sessionid_read
,
1319 .llseek
= generic_file_llseek
,
1323 #ifdef CONFIG_FAULT_INJECTION
1324 static ssize_t
proc_fault_inject_read(struct file
* file
, char __user
* buf
,
1325 size_t count
, loff_t
*ppos
)
1327 struct task_struct
*task
= get_proc_task(file_inode(file
));
1328 char buffer
[PROC_NUMBUF
];
1334 make_it_fail
= task
->make_it_fail
;
1335 put_task_struct(task
);
1337 len
= snprintf(buffer
, sizeof(buffer
), "%i\n", make_it_fail
);
1339 return simple_read_from_buffer(buf
, count
, ppos
, buffer
, len
);
1342 static ssize_t
proc_fault_inject_write(struct file
* file
,
1343 const char __user
* buf
, size_t count
, loff_t
*ppos
)
1345 struct task_struct
*task
;
1346 char buffer
[PROC_NUMBUF
];
1350 if (!capable(CAP_SYS_RESOURCE
))
1352 memset(buffer
, 0, sizeof(buffer
));
1353 if (count
> sizeof(buffer
) - 1)
1354 count
= sizeof(buffer
) - 1;
1355 if (copy_from_user(buffer
, buf
, count
))
1357 rv
= kstrtoint(strstrip(buffer
), 0, &make_it_fail
);
1360 if (make_it_fail
< 0 || make_it_fail
> 1)
1363 task
= get_proc_task(file_inode(file
));
1366 task
->make_it_fail
= make_it_fail
;
1367 put_task_struct(task
);
1372 static const struct file_operations proc_fault_inject_operations
= {
1373 .read
= proc_fault_inject_read
,
1374 .write
= proc_fault_inject_write
,
1375 .llseek
= generic_file_llseek
,
1380 #ifdef CONFIG_SCHED_DEBUG
1382 * Print out various scheduling related per-task fields:
1384 static int sched_show(struct seq_file
*m
, void *v
)
1386 struct inode
*inode
= m
->private;
1387 struct task_struct
*p
;
1389 p
= get_proc_task(inode
);
1392 proc_sched_show_task(p
, m
);
1400 sched_write(struct file
*file
, const char __user
*buf
,
1401 size_t count
, loff_t
*offset
)
1403 struct inode
*inode
= file_inode(file
);
1404 struct task_struct
*p
;
1406 p
= get_proc_task(inode
);
1409 proc_sched_set_task(p
);
1416 static int sched_open(struct inode
*inode
, struct file
*filp
)
1418 return single_open(filp
, sched_show
, inode
);
1421 static const struct file_operations proc_pid_sched_operations
= {
1424 .write
= sched_write
,
1425 .llseek
= seq_lseek
,
1426 .release
= single_release
,
1431 #ifdef CONFIG_SCHED_AUTOGROUP
1433 * Print out autogroup related information:
1435 static int sched_autogroup_show(struct seq_file
*m
, void *v
)
1437 struct inode
*inode
= m
->private;
1438 struct task_struct
*p
;
1440 p
= get_proc_task(inode
);
1443 proc_sched_autogroup_show_task(p
, m
);
1451 sched_autogroup_write(struct file
*file
, const char __user
*buf
,
1452 size_t count
, loff_t
*offset
)
1454 struct inode
*inode
= file_inode(file
);
1455 struct task_struct
*p
;
1456 char buffer
[PROC_NUMBUF
];
1460 memset(buffer
, 0, sizeof(buffer
));
1461 if (count
> sizeof(buffer
) - 1)
1462 count
= sizeof(buffer
) - 1;
1463 if (copy_from_user(buffer
, buf
, count
))
1466 err
= kstrtoint(strstrip(buffer
), 0, &nice
);
1470 p
= get_proc_task(inode
);
1474 err
= proc_sched_autogroup_set_nice(p
, nice
);
1483 static int sched_autogroup_open(struct inode
*inode
, struct file
*filp
)
1487 ret
= single_open(filp
, sched_autogroup_show
, NULL
);
1489 struct seq_file
*m
= filp
->private_data
;
1496 static const struct file_operations proc_pid_sched_autogroup_operations
= {
1497 .open
= sched_autogroup_open
,
1499 .write
= sched_autogroup_write
,
1500 .llseek
= seq_lseek
,
1501 .release
= single_release
,
1504 #endif /* CONFIG_SCHED_AUTOGROUP */
1506 static ssize_t
comm_write(struct file
*file
, const char __user
*buf
,
1507 size_t count
, loff_t
*offset
)
1509 struct inode
*inode
= file_inode(file
);
1510 struct task_struct
*p
;
1511 char buffer
[TASK_COMM_LEN
];
1512 const size_t maxlen
= sizeof(buffer
) - 1;
1514 memset(buffer
, 0, sizeof(buffer
));
1515 if (copy_from_user(buffer
, buf
, count
> maxlen
? maxlen
: count
))
1518 p
= get_proc_task(inode
);
1522 if (same_thread_group(current
, p
))
1523 set_task_comm(p
, buffer
);
1532 static int comm_show(struct seq_file
*m
, void *v
)
1534 struct inode
*inode
= m
->private;
1535 struct task_struct
*p
;
1537 p
= get_proc_task(inode
);
1542 seq_printf(m
, "%s\n", p
->comm
);
1550 static int comm_open(struct inode
*inode
, struct file
*filp
)
1552 return single_open(filp
, comm_show
, inode
);
1555 static const struct file_operations proc_pid_set_comm_operations
= {
1558 .write
= comm_write
,
1559 .llseek
= seq_lseek
,
1560 .release
= single_release
,
1563 static int proc_exe_link(struct dentry
*dentry
, struct path
*exe_path
)
1565 struct task_struct
*task
;
1566 struct file
*exe_file
;
1568 task
= get_proc_task(d_inode(dentry
));
1571 exe_file
= get_task_exe_file(task
);
1572 put_task_struct(task
);
1574 *exe_path
= exe_file
->f_path
;
1575 path_get(&exe_file
->f_path
);
1582 static const char *proc_pid_get_link(struct dentry
*dentry
,
1583 struct inode
*inode
,
1584 struct delayed_call
*done
)
1587 int error
= -EACCES
;
1590 return ERR_PTR(-ECHILD
);
1592 /* Are we allowed to snoop on the tasks file descriptors? */
1593 if (!proc_fd_access_allowed(inode
))
1596 error
= PROC_I(inode
)->op
.proc_get_link(dentry
, &path
);
1600 nd_jump_link(&path
);
1603 return ERR_PTR(error
);
1606 static int do_proc_readlink(struct path
*path
, char __user
*buffer
, int buflen
)
1608 char *tmp
= (char*)__get_free_page(GFP_TEMPORARY
);
1615 pathname
= d_path(path
, tmp
, PAGE_SIZE
);
1616 len
= PTR_ERR(pathname
);
1617 if (IS_ERR(pathname
))
1619 len
= tmp
+ PAGE_SIZE
- 1 - pathname
;
1623 if (copy_to_user(buffer
, pathname
, len
))
1626 free_page((unsigned long)tmp
);
1630 static int proc_pid_readlink(struct dentry
* dentry
, char __user
* buffer
, int buflen
)
1632 int error
= -EACCES
;
1633 struct inode
*inode
= d_inode(dentry
);
1636 /* Are we allowed to snoop on the tasks file descriptors? */
1637 if (!proc_fd_access_allowed(inode
))
1640 error
= PROC_I(inode
)->op
.proc_get_link(dentry
, &path
);
1644 error
= do_proc_readlink(&path
, buffer
, buflen
);
1650 const struct inode_operations proc_pid_link_inode_operations
= {
1651 .readlink
= proc_pid_readlink
,
1652 .get_link
= proc_pid_get_link
,
1653 .setattr
= proc_setattr
,
1657 /* building an inode */
1659 struct inode
*proc_pid_make_inode(struct super_block
* sb
, struct task_struct
*task
)
1661 struct inode
* inode
;
1662 struct proc_inode
*ei
;
1663 const struct cred
*cred
;
1665 /* We need a new inode */
1667 inode
= new_inode(sb
);
1673 inode
->i_ino
= get_next_ino();
1674 inode
->i_mtime
= inode
->i_atime
= inode
->i_ctime
= current_time(inode
);
1675 inode
->i_op
= &proc_def_inode_operations
;
1678 * grab the reference to task.
1680 ei
->pid
= get_task_pid(task
, PIDTYPE_PID
);
1684 if (task_dumpable(task
)) {
1686 cred
= __task_cred(task
);
1687 inode
->i_uid
= cred
->euid
;
1688 inode
->i_gid
= cred
->egid
;
1691 security_task_to_inode(task
, inode
);
1701 int pid_getattr(struct vfsmount
*mnt
, struct dentry
*dentry
, struct kstat
*stat
)
1703 struct inode
*inode
= d_inode(dentry
);
1704 struct task_struct
*task
;
1705 const struct cred
*cred
;
1706 struct pid_namespace
*pid
= dentry
->d_sb
->s_fs_info
;
1708 generic_fillattr(inode
, stat
);
1711 stat
->uid
= GLOBAL_ROOT_UID
;
1712 stat
->gid
= GLOBAL_ROOT_GID
;
1713 task
= pid_task(proc_pid(inode
), PIDTYPE_PID
);
1715 if (!has_pid_permissions(pid
, task
, 2)) {
1718 * This doesn't prevent learning whether PID exists,
1719 * it only makes getattr() consistent with readdir().
1723 if ((inode
->i_mode
== (S_IFDIR
|S_IRUGO
|S_IXUGO
)) ||
1724 task_dumpable(task
)) {
1725 cred
= __task_cred(task
);
1726 stat
->uid
= cred
->euid
;
1727 stat
->gid
= cred
->egid
;
1737 * Exceptional case: normally we are not allowed to unhash a busy
1738 * directory. In this case, however, we can do it - no aliasing problems
1739 * due to the way we treat inodes.
1741 * Rewrite the inode's ownerships here because the owning task may have
1742 * performed a setuid(), etc.
1744 * Before the /proc/pid/status file was created the only way to read
1745 * the effective uid of a /process was to stat /proc/pid. Reading
1746 * /proc/pid/status is slow enough that procps and other packages
1747 * kept stating /proc/pid. To keep the rules in /proc simple I have
1748 * made this apply to all per process world readable and executable
1751 int pid_revalidate(struct dentry
*dentry
, unsigned int flags
)
1753 struct inode
*inode
;
1754 struct task_struct
*task
;
1755 const struct cred
*cred
;
1757 if (flags
& LOOKUP_RCU
)
1760 inode
= d_inode(dentry
);
1761 task
= get_proc_task(inode
);
1764 if ((inode
->i_mode
== (S_IFDIR
|S_IRUGO
|S_IXUGO
)) ||
1765 task_dumpable(task
)) {
1767 cred
= __task_cred(task
);
1768 inode
->i_uid
= cred
->euid
;
1769 inode
->i_gid
= cred
->egid
;
1772 inode
->i_uid
= GLOBAL_ROOT_UID
;
1773 inode
->i_gid
= GLOBAL_ROOT_GID
;
1775 inode
->i_mode
&= ~(S_ISUID
| S_ISGID
);
1776 security_task_to_inode(task
, inode
);
1777 put_task_struct(task
);
1783 static inline bool proc_inode_is_dead(struct inode
*inode
)
1785 return !proc_pid(inode
)->tasks
[PIDTYPE_PID
].first
;
1788 int pid_delete_dentry(const struct dentry
*dentry
)
1790 /* Is the task we represent dead?
1791 * If so, then don't put the dentry on the lru list,
1792 * kill it immediately.
1794 return proc_inode_is_dead(d_inode(dentry
));
1797 const struct dentry_operations pid_dentry_operations
=
1799 .d_revalidate
= pid_revalidate
,
1800 .d_delete
= pid_delete_dentry
,
1806 * Fill a directory entry.
1808 * If possible create the dcache entry and derive our inode number and
1809 * file type from dcache entry.
1811 * Since all of the proc inode numbers are dynamically generated, the inode
1812 * numbers do not exist until the inode is cache. This means creating the
1813 * the dcache entry in readdir is necessary to keep the inode numbers
1814 * reported by readdir in sync with the inode numbers reported
1817 bool proc_fill_cache(struct file
*file
, struct dir_context
*ctx
,
1818 const char *name
, int len
,
1819 instantiate_t instantiate
, struct task_struct
*task
, const void *ptr
)
1821 struct dentry
*child
, *dir
= file
->f_path
.dentry
;
1822 struct qstr qname
= QSTR_INIT(name
, len
);
1823 struct inode
*inode
;
1827 child
= d_hash_and_lookup(dir
, &qname
);
1829 DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq
);
1830 child
= d_alloc_parallel(dir
, &qname
, &wq
);
1832 goto end_instantiate
;
1833 if (d_in_lookup(child
)) {
1834 int err
= instantiate(d_inode(dir
), child
, task
, ptr
);
1835 d_lookup_done(child
);
1838 goto end_instantiate
;
1842 inode
= d_inode(child
);
1844 type
= inode
->i_mode
>> 12;
1846 return dir_emit(ctx
, name
, len
, ino
, type
);
1849 return dir_emit(ctx
, name
, len
, 1, DT_UNKNOWN
);
1853 * dname_to_vma_addr - maps a dentry name into two unsigned longs
1854 * which represent vma start and end addresses.
1856 static int dname_to_vma_addr(struct dentry
*dentry
,
1857 unsigned long *start
, unsigned long *end
)
1859 if (sscanf(dentry
->d_name
.name
, "%lx-%lx", start
, end
) != 2)
1865 static int map_files_d_revalidate(struct dentry
*dentry
, unsigned int flags
)
1867 unsigned long vm_start
, vm_end
;
1868 bool exact_vma_exists
= false;
1869 struct mm_struct
*mm
= NULL
;
1870 struct task_struct
*task
;
1871 const struct cred
*cred
;
1872 struct inode
*inode
;
1875 if (flags
& LOOKUP_RCU
)
1878 inode
= d_inode(dentry
);
1879 task
= get_proc_task(inode
);
1883 mm
= mm_access(task
, PTRACE_MODE_READ_FSCREDS
);
1884 if (IS_ERR_OR_NULL(mm
))
1887 if (!dname_to_vma_addr(dentry
, &vm_start
, &vm_end
)) {
1888 down_read(&mm
->mmap_sem
);
1889 exact_vma_exists
= !!find_exact_vma(mm
, vm_start
, vm_end
);
1890 up_read(&mm
->mmap_sem
);
1895 if (exact_vma_exists
) {
1896 if (task_dumpable(task
)) {
1898 cred
= __task_cred(task
);
1899 inode
->i_uid
= cred
->euid
;
1900 inode
->i_gid
= cred
->egid
;
1903 inode
->i_uid
= GLOBAL_ROOT_UID
;
1904 inode
->i_gid
= GLOBAL_ROOT_GID
;
1906 security_task_to_inode(task
, inode
);
1911 put_task_struct(task
);
1917 static const struct dentry_operations tid_map_files_dentry_operations
= {
1918 .d_revalidate
= map_files_d_revalidate
,
1919 .d_delete
= pid_delete_dentry
,
1922 static int map_files_get_link(struct dentry
*dentry
, struct path
*path
)
1924 unsigned long vm_start
, vm_end
;
1925 struct vm_area_struct
*vma
;
1926 struct task_struct
*task
;
1927 struct mm_struct
*mm
;
1931 task
= get_proc_task(d_inode(dentry
));
1935 mm
= get_task_mm(task
);
1936 put_task_struct(task
);
1940 rc
= dname_to_vma_addr(dentry
, &vm_start
, &vm_end
);
1945 down_read(&mm
->mmap_sem
);
1946 vma
= find_exact_vma(mm
, vm_start
, vm_end
);
1947 if (vma
&& vma
->vm_file
) {
1948 *path
= vma
->vm_file
->f_path
;
1952 up_read(&mm
->mmap_sem
);
1960 struct map_files_info
{
1963 unsigned char name
[4*sizeof(long)+2]; /* max: %lx-%lx\0 */
1967 * Only allow CAP_SYS_ADMIN to follow the links, due to concerns about how the
1968 * symlinks may be used to bypass permissions on ancestor directories in the
1969 * path to the file in question.
1972 proc_map_files_get_link(struct dentry
*dentry
,
1973 struct inode
*inode
,
1974 struct delayed_call
*done
)
1976 if (!capable(CAP_SYS_ADMIN
))
1977 return ERR_PTR(-EPERM
);
1979 return proc_pid_get_link(dentry
, inode
, done
);
1983 * Identical to proc_pid_link_inode_operations except for get_link()
1985 static const struct inode_operations proc_map_files_link_inode_operations
= {
1986 .readlink
= proc_pid_readlink
,
1987 .get_link
= proc_map_files_get_link
,
1988 .setattr
= proc_setattr
,
1992 proc_map_files_instantiate(struct inode
*dir
, struct dentry
*dentry
,
1993 struct task_struct
*task
, const void *ptr
)
1995 fmode_t mode
= (fmode_t
)(unsigned long)ptr
;
1996 struct proc_inode
*ei
;
1997 struct inode
*inode
;
1999 inode
= proc_pid_make_inode(dir
->i_sb
, task
);
2004 ei
->op
.proc_get_link
= map_files_get_link
;
2006 inode
->i_op
= &proc_map_files_link_inode_operations
;
2008 inode
->i_mode
= S_IFLNK
;
2010 if (mode
& FMODE_READ
)
2011 inode
->i_mode
|= S_IRUSR
;
2012 if (mode
& FMODE_WRITE
)
2013 inode
->i_mode
|= S_IWUSR
;
2015 d_set_d_op(dentry
, &tid_map_files_dentry_operations
);
2016 d_add(dentry
, inode
);
2021 static struct dentry
*proc_map_files_lookup(struct inode
*dir
,
2022 struct dentry
*dentry
, unsigned int flags
)
2024 unsigned long vm_start
, vm_end
;
2025 struct vm_area_struct
*vma
;
2026 struct task_struct
*task
;
2028 struct mm_struct
*mm
;
2031 task
= get_proc_task(dir
);
2036 if (!ptrace_may_access(task
, PTRACE_MODE_READ_FSCREDS
))
2040 if (dname_to_vma_addr(dentry
, &vm_start
, &vm_end
))
2043 mm
= get_task_mm(task
);
2047 down_read(&mm
->mmap_sem
);
2048 vma
= find_exact_vma(mm
, vm_start
, vm_end
);
2053 result
= proc_map_files_instantiate(dir
, dentry
, task
,
2054 (void *)(unsigned long)vma
->vm_file
->f_mode
);
2057 up_read(&mm
->mmap_sem
);
2060 put_task_struct(task
);
2062 return ERR_PTR(result
);
2065 static const struct inode_operations proc_map_files_inode_operations
= {
2066 .lookup
= proc_map_files_lookup
,
2067 .permission
= proc_fd_permission
,
2068 .setattr
= proc_setattr
,
2072 proc_map_files_readdir(struct file
*file
, struct dir_context
*ctx
)
2074 struct vm_area_struct
*vma
;
2075 struct task_struct
*task
;
2076 struct mm_struct
*mm
;
2077 unsigned long nr_files
, pos
, i
;
2078 struct flex_array
*fa
= NULL
;
2079 struct map_files_info info
;
2080 struct map_files_info
*p
;
2084 task
= get_proc_task(file_inode(file
));
2089 if (!ptrace_may_access(task
, PTRACE_MODE_READ_FSCREDS
))
2093 if (!dir_emit_dots(file
, ctx
))
2096 mm
= get_task_mm(task
);
2099 down_read(&mm
->mmap_sem
);
2104 * We need two passes here:
2106 * 1) Collect vmas of mapped files with mmap_sem taken
2107 * 2) Release mmap_sem and instantiate entries
2109 * otherwise we get lockdep complained, since filldir()
2110 * routine might require mmap_sem taken in might_fault().
2113 for (vma
= mm
->mmap
, pos
= 2; vma
; vma
= vma
->vm_next
) {
2114 if (vma
->vm_file
&& ++pos
> ctx
->pos
)
2119 fa
= flex_array_alloc(sizeof(info
), nr_files
,
2121 if (!fa
|| flex_array_prealloc(fa
, 0, nr_files
,
2125 flex_array_free(fa
);
2126 up_read(&mm
->mmap_sem
);
2130 for (i
= 0, vma
= mm
->mmap
, pos
= 2; vma
;
2131 vma
= vma
->vm_next
) {
2134 if (++pos
<= ctx
->pos
)
2137 info
.mode
= vma
->vm_file
->f_mode
;
2138 info
.len
= snprintf(info
.name
,
2139 sizeof(info
.name
), "%lx-%lx",
2140 vma
->vm_start
, vma
->vm_end
);
2141 if (flex_array_put(fa
, i
++, &info
, GFP_KERNEL
))
2145 up_read(&mm
->mmap_sem
);
2147 for (i
= 0; i
< nr_files
; i
++) {
2148 p
= flex_array_get(fa
, i
);
2149 if (!proc_fill_cache(file
, ctx
,
2151 proc_map_files_instantiate
,
2153 (void *)(unsigned long)p
->mode
))
2158 flex_array_free(fa
);
2162 put_task_struct(task
);
2167 static const struct file_operations proc_map_files_operations
= {
2168 .read
= generic_read_dir
,
2169 .iterate_shared
= proc_map_files_readdir
,
2170 .llseek
= generic_file_llseek
,
2173 #ifdef CONFIG_CHECKPOINT_RESTORE
2174 struct timers_private
{
2176 struct task_struct
*task
;
2177 struct sighand_struct
*sighand
;
2178 struct pid_namespace
*ns
;
2179 unsigned long flags
;
2182 static void *timers_start(struct seq_file
*m
, loff_t
*pos
)
2184 struct timers_private
*tp
= m
->private;
2186 tp
->task
= get_pid_task(tp
->pid
, PIDTYPE_PID
);
2188 return ERR_PTR(-ESRCH
);
2190 tp
->sighand
= lock_task_sighand(tp
->task
, &tp
->flags
);
2192 return ERR_PTR(-ESRCH
);
2194 return seq_list_start(&tp
->task
->signal
->posix_timers
, *pos
);
2197 static void *timers_next(struct seq_file
*m
, void *v
, loff_t
*pos
)
2199 struct timers_private
*tp
= m
->private;
2200 return seq_list_next(v
, &tp
->task
->signal
->posix_timers
, pos
);
2203 static void timers_stop(struct seq_file
*m
, void *v
)
2205 struct timers_private
*tp
= m
->private;
2208 unlock_task_sighand(tp
->task
, &tp
->flags
);
2213 put_task_struct(tp
->task
);
2218 static int show_timer(struct seq_file
*m
, void *v
)
2220 struct k_itimer
*timer
;
2221 struct timers_private
*tp
= m
->private;
2223 static const char * const nstr
[] = {
2224 [SIGEV_SIGNAL
] = "signal",
2225 [SIGEV_NONE
] = "none",
2226 [SIGEV_THREAD
] = "thread",
2229 timer
= list_entry((struct list_head
*)v
, struct k_itimer
, list
);
2230 notify
= timer
->it_sigev_notify
;
2232 seq_printf(m
, "ID: %d\n", timer
->it_id
);
2233 seq_printf(m
, "signal: %d/%p\n",
2234 timer
->sigq
->info
.si_signo
,
2235 timer
->sigq
->info
.si_value
.sival_ptr
);
2236 seq_printf(m
, "notify: %s/%s.%d\n",
2237 nstr
[notify
& ~SIGEV_THREAD_ID
],
2238 (notify
& SIGEV_THREAD_ID
) ? "tid" : "pid",
2239 pid_nr_ns(timer
->it_pid
, tp
->ns
));
2240 seq_printf(m
, "ClockID: %d\n", timer
->it_clock
);
2245 static const struct seq_operations proc_timers_seq_ops
= {
2246 .start
= timers_start
,
2247 .next
= timers_next
,
2248 .stop
= timers_stop
,
2252 static int proc_timers_open(struct inode
*inode
, struct file
*file
)
2254 struct timers_private
*tp
;
2256 tp
= __seq_open_private(file
, &proc_timers_seq_ops
,
2257 sizeof(struct timers_private
));
2261 tp
->pid
= proc_pid(inode
);
2262 tp
->ns
= inode
->i_sb
->s_fs_info
;
2266 static const struct file_operations proc_timers_operations
= {
2267 .open
= proc_timers_open
,
2269 .llseek
= seq_lseek
,
2270 .release
= seq_release_private
,
2274 static ssize_t
timerslack_ns_write(struct file
*file
, const char __user
*buf
,
2275 size_t count
, loff_t
*offset
)
2277 struct inode
*inode
= file_inode(file
);
2278 struct task_struct
*p
;
2282 err
= kstrtoull_from_user(buf
, count
, 10, &slack_ns
);
2286 p
= get_proc_task(inode
);
2291 if (!capable(CAP_SYS_NICE
)) {
2296 err
= security_task_setscheduler(p
);
2305 p
->timer_slack_ns
= p
->default_timer_slack_ns
;
2307 p
->timer_slack_ns
= slack_ns
;
2316 static int timerslack_ns_show(struct seq_file
*m
, void *v
)
2318 struct inode
*inode
= m
->private;
2319 struct task_struct
*p
;
2322 p
= get_proc_task(inode
);
2328 if (!capable(CAP_SYS_NICE
)) {
2332 err
= security_task_getscheduler(p
);
2338 seq_printf(m
, "%llu\n", p
->timer_slack_ns
);
2347 static int timerslack_ns_open(struct inode
*inode
, struct file
*filp
)
2349 return single_open(filp
, timerslack_ns_show
, inode
);
2352 static const struct file_operations proc_pid_set_timerslack_ns_operations
= {
2353 .open
= timerslack_ns_open
,
2355 .write
= timerslack_ns_write
,
2356 .llseek
= seq_lseek
,
2357 .release
= single_release
,
2360 static int proc_pident_instantiate(struct inode
*dir
,
2361 struct dentry
*dentry
, struct task_struct
*task
, const void *ptr
)
2363 const struct pid_entry
*p
= ptr
;
2364 struct inode
*inode
;
2365 struct proc_inode
*ei
;
2367 inode
= proc_pid_make_inode(dir
->i_sb
, task
);
2372 inode
->i_mode
= p
->mode
;
2373 if (S_ISDIR(inode
->i_mode
))
2374 set_nlink(inode
, 2); /* Use getattr to fix if necessary */
2376 inode
->i_op
= p
->iop
;
2378 inode
->i_fop
= p
->fop
;
2380 d_set_d_op(dentry
, &pid_dentry_operations
);
2381 d_add(dentry
, inode
);
2382 /* Close the race of the process dying before we return the dentry */
2383 if (pid_revalidate(dentry
, 0))
2389 static struct dentry
*proc_pident_lookup(struct inode
*dir
,
2390 struct dentry
*dentry
,
2391 const struct pid_entry
*ents
,
2395 struct task_struct
*task
= get_proc_task(dir
);
2396 const struct pid_entry
*p
, *last
;
2404 * Yes, it does not scale. And it should not. Don't add
2405 * new entries into /proc/<tgid>/ without very good reasons.
2407 last
= &ents
[nents
- 1];
2408 for (p
= ents
; p
<= last
; p
++) {
2409 if (p
->len
!= dentry
->d_name
.len
)
2411 if (!memcmp(dentry
->d_name
.name
, p
->name
, p
->len
))
2417 error
= proc_pident_instantiate(dir
, dentry
, task
, p
);
2419 put_task_struct(task
);
2421 return ERR_PTR(error
);
2424 static int proc_pident_readdir(struct file
*file
, struct dir_context
*ctx
,
2425 const struct pid_entry
*ents
, unsigned int nents
)
2427 struct task_struct
*task
= get_proc_task(file_inode(file
));
2428 const struct pid_entry
*p
;
2433 if (!dir_emit_dots(file
, ctx
))
2436 if (ctx
->pos
>= nents
+ 2)
2439 for (p
= ents
+ (ctx
->pos
- 2); p
<= ents
+ nents
- 1; p
++) {
2440 if (!proc_fill_cache(file
, ctx
, p
->name
, p
->len
,
2441 proc_pident_instantiate
, task
, p
))
2446 put_task_struct(task
);
2450 #ifdef CONFIG_SECURITY
2451 static ssize_t
proc_pid_attr_read(struct file
* file
, char __user
* buf
,
2452 size_t count
, loff_t
*ppos
)
2454 struct inode
* inode
= file_inode(file
);
2457 struct task_struct
*task
= get_proc_task(inode
);
2462 length
= security_getprocattr(task
,
2463 (char*)file
->f_path
.dentry
->d_name
.name
,
2465 put_task_struct(task
);
2467 length
= simple_read_from_buffer(buf
, count
, ppos
, p
, length
);
2472 static ssize_t
proc_pid_attr_write(struct file
* file
, const char __user
* buf
,
2473 size_t count
, loff_t
*ppos
)
2475 struct inode
* inode
= file_inode(file
);
2478 struct task_struct
*task
= get_proc_task(inode
);
2483 if (count
> PAGE_SIZE
)
2486 /* No partial writes. */
2491 page
= memdup_user(buf
, count
);
2493 length
= PTR_ERR(page
);
2497 /* Guard against adverse ptrace interaction */
2498 length
= mutex_lock_interruptible(&task
->signal
->cred_guard_mutex
);
2502 length
= security_setprocattr(task
,
2503 (char*)file
->f_path
.dentry
->d_name
.name
,
2505 mutex_unlock(&task
->signal
->cred_guard_mutex
);
2509 put_task_struct(task
);
2514 static const struct file_operations proc_pid_attr_operations
= {
2515 .read
= proc_pid_attr_read
,
2516 .write
= proc_pid_attr_write
,
2517 .llseek
= generic_file_llseek
,
2520 static const struct pid_entry attr_dir_stuff
[] = {
2521 REG("current", S_IRUGO
|S_IWUGO
, proc_pid_attr_operations
),
2522 REG("prev", S_IRUGO
, proc_pid_attr_operations
),
2523 REG("exec", S_IRUGO
|S_IWUGO
, proc_pid_attr_operations
),
2524 REG("fscreate", S_IRUGO
|S_IWUGO
, proc_pid_attr_operations
),
2525 REG("keycreate", S_IRUGO
|S_IWUGO
, proc_pid_attr_operations
),
2526 REG("sockcreate", S_IRUGO
|S_IWUGO
, proc_pid_attr_operations
),
2529 static int proc_attr_dir_readdir(struct file
*file
, struct dir_context
*ctx
)
2531 return proc_pident_readdir(file
, ctx
,
2532 attr_dir_stuff
, ARRAY_SIZE(attr_dir_stuff
));
2535 static const struct file_operations proc_attr_dir_operations
= {
2536 .read
= generic_read_dir
,
2537 .iterate_shared
= proc_attr_dir_readdir
,
2538 .llseek
= generic_file_llseek
,
2541 static struct dentry
*proc_attr_dir_lookup(struct inode
*dir
,
2542 struct dentry
*dentry
, unsigned int flags
)
2544 return proc_pident_lookup(dir
, dentry
,
2545 attr_dir_stuff
, ARRAY_SIZE(attr_dir_stuff
));
2548 static const struct inode_operations proc_attr_dir_inode_operations
= {
2549 .lookup
= proc_attr_dir_lookup
,
2550 .getattr
= pid_getattr
,
2551 .setattr
= proc_setattr
,
2556 #ifdef CONFIG_ELF_CORE
2557 static ssize_t
proc_coredump_filter_read(struct file
*file
, char __user
*buf
,
2558 size_t count
, loff_t
*ppos
)
2560 struct task_struct
*task
= get_proc_task(file_inode(file
));
2561 struct mm_struct
*mm
;
2562 char buffer
[PROC_NUMBUF
];
2570 mm
= get_task_mm(task
);
2572 len
= snprintf(buffer
, sizeof(buffer
), "%08lx\n",
2573 ((mm
->flags
& MMF_DUMP_FILTER_MASK
) >>
2574 MMF_DUMP_FILTER_SHIFT
));
2576 ret
= simple_read_from_buffer(buf
, count
, ppos
, buffer
, len
);
2579 put_task_struct(task
);
2584 static ssize_t
proc_coredump_filter_write(struct file
*file
,
2585 const char __user
*buf
,
2589 struct task_struct
*task
;
2590 struct mm_struct
*mm
;
2596 ret
= kstrtouint_from_user(buf
, count
, 0, &val
);
2601 task
= get_proc_task(file_inode(file
));
2605 mm
= get_task_mm(task
);
2610 for (i
= 0, mask
= 1; i
< MMF_DUMP_FILTER_BITS
; i
++, mask
<<= 1) {
2612 set_bit(i
+ MMF_DUMP_FILTER_SHIFT
, &mm
->flags
);
2614 clear_bit(i
+ MMF_DUMP_FILTER_SHIFT
, &mm
->flags
);
2619 put_task_struct(task
);
2626 static const struct file_operations proc_coredump_filter_operations
= {
2627 .read
= proc_coredump_filter_read
,
2628 .write
= proc_coredump_filter_write
,
2629 .llseek
= generic_file_llseek
,
2633 #ifdef CONFIG_TASK_IO_ACCOUNTING
2634 static int do_io_accounting(struct task_struct
*task
, struct seq_file
*m
, int whole
)
2636 struct task_io_accounting acct
= task
->ioac
;
2637 unsigned long flags
;
2640 result
= mutex_lock_killable(&task
->signal
->cred_guard_mutex
);
2644 if (!ptrace_may_access(task
, PTRACE_MODE_READ_FSCREDS
)) {
2649 if (whole
&& lock_task_sighand(task
, &flags
)) {
2650 struct task_struct
*t
= task
;
2652 task_io_accounting_add(&acct
, &task
->signal
->ioac
);
2653 while_each_thread(task
, t
)
2654 task_io_accounting_add(&acct
, &t
->ioac
);
2656 unlock_task_sighand(task
, &flags
);
2663 "read_bytes: %llu\n"
2664 "write_bytes: %llu\n"
2665 "cancelled_write_bytes: %llu\n",
2666 (unsigned long long)acct
.rchar
,
2667 (unsigned long long)acct
.wchar
,
2668 (unsigned long long)acct
.syscr
,
2669 (unsigned long long)acct
.syscw
,
2670 (unsigned long long)acct
.read_bytes
,
2671 (unsigned long long)acct
.write_bytes
,
2672 (unsigned long long)acct
.cancelled_write_bytes
);
2676 mutex_unlock(&task
->signal
->cred_guard_mutex
);
2680 static int proc_tid_io_accounting(struct seq_file
*m
, struct pid_namespace
*ns
,
2681 struct pid
*pid
, struct task_struct
*task
)
2683 return do_io_accounting(task
, m
, 0);
2686 static int proc_tgid_io_accounting(struct seq_file
*m
, struct pid_namespace
*ns
,
2687 struct pid
*pid
, struct task_struct
*task
)
2689 return do_io_accounting(task
, m
, 1);
2691 #endif /* CONFIG_TASK_IO_ACCOUNTING */
2693 #ifdef CONFIG_USER_NS
2694 static int proc_id_map_open(struct inode
*inode
, struct file
*file
,
2695 const struct seq_operations
*seq_ops
)
2697 struct user_namespace
*ns
= NULL
;
2698 struct task_struct
*task
;
2699 struct seq_file
*seq
;
2702 task
= get_proc_task(inode
);
2705 ns
= get_user_ns(task_cred_xxx(task
, user_ns
));
2707 put_task_struct(task
);
2712 ret
= seq_open(file
, seq_ops
);
2716 seq
= file
->private_data
;
2726 static int proc_id_map_release(struct inode
*inode
, struct file
*file
)
2728 struct seq_file
*seq
= file
->private_data
;
2729 struct user_namespace
*ns
= seq
->private;
2731 return seq_release(inode
, file
);
2734 static int proc_uid_map_open(struct inode
*inode
, struct file
*file
)
2736 return proc_id_map_open(inode
, file
, &proc_uid_seq_operations
);
2739 static int proc_gid_map_open(struct inode
*inode
, struct file
*file
)
2741 return proc_id_map_open(inode
, file
, &proc_gid_seq_operations
);
2744 static int proc_projid_map_open(struct inode
*inode
, struct file
*file
)
2746 return proc_id_map_open(inode
, file
, &proc_projid_seq_operations
);
2749 static const struct file_operations proc_uid_map_operations
= {
2750 .open
= proc_uid_map_open
,
2751 .write
= proc_uid_map_write
,
2753 .llseek
= seq_lseek
,
2754 .release
= proc_id_map_release
,
2757 static const struct file_operations proc_gid_map_operations
= {
2758 .open
= proc_gid_map_open
,
2759 .write
= proc_gid_map_write
,
2761 .llseek
= seq_lseek
,
2762 .release
= proc_id_map_release
,
2765 static const struct file_operations proc_projid_map_operations
= {
2766 .open
= proc_projid_map_open
,
2767 .write
= proc_projid_map_write
,
2769 .llseek
= seq_lseek
,
2770 .release
= proc_id_map_release
,
2773 static int proc_setgroups_open(struct inode
*inode
, struct file
*file
)
2775 struct user_namespace
*ns
= NULL
;
2776 struct task_struct
*task
;
2780 task
= get_proc_task(inode
);
2783 ns
= get_user_ns(task_cred_xxx(task
, user_ns
));
2785 put_task_struct(task
);
2790 if (file
->f_mode
& FMODE_WRITE
) {
2792 if (!ns_capable(ns
, CAP_SYS_ADMIN
))
2796 ret
= single_open(file
, &proc_setgroups_show
, ns
);
2807 static int proc_setgroups_release(struct inode
*inode
, struct file
*file
)
2809 struct seq_file
*seq
= file
->private_data
;
2810 struct user_namespace
*ns
= seq
->private;
2811 int ret
= single_release(inode
, file
);
2816 static const struct file_operations proc_setgroups_operations
= {
2817 .open
= proc_setgroups_open
,
2818 .write
= proc_setgroups_write
,
2820 .llseek
= seq_lseek
,
2821 .release
= proc_setgroups_release
,
2823 #endif /* CONFIG_USER_NS */
2825 static int proc_pid_personality(struct seq_file
*m
, struct pid_namespace
*ns
,
2826 struct pid
*pid
, struct task_struct
*task
)
2828 int err
= lock_trace(task
);
2830 seq_printf(m
, "%08x\n", task
->personality
);
2839 static const struct file_operations proc_task_operations
;
2840 static const struct inode_operations proc_task_inode_operations
;
2842 static const struct pid_entry tgid_base_stuff
[] = {
2843 DIR("task", S_IRUGO
|S_IXUGO
, proc_task_inode_operations
, proc_task_operations
),
2844 DIR("fd", S_IRUSR
|S_IXUSR
, proc_fd_inode_operations
, proc_fd_operations
),
2845 DIR("map_files", S_IRUSR
|S_IXUSR
, proc_map_files_inode_operations
, proc_map_files_operations
),
2846 DIR("fdinfo", S_IRUSR
|S_IXUSR
, proc_fdinfo_inode_operations
, proc_fdinfo_operations
),
2847 DIR("ns", S_IRUSR
|S_IXUGO
, proc_ns_dir_inode_operations
, proc_ns_dir_operations
),
2849 DIR("net", S_IRUGO
|S_IXUGO
, proc_net_inode_operations
, proc_net_operations
),
2851 REG("environ", S_IRUSR
, proc_environ_operations
),
2852 REG("auxv", S_IRUSR
, proc_auxv_operations
),
2853 ONE("status", S_IRUGO
, proc_pid_status
),
2854 ONE("personality", S_IRUSR
, proc_pid_personality
),
2855 ONE("limits", S_IRUGO
, proc_pid_limits
),
2856 #ifdef CONFIG_SCHED_DEBUG
2857 REG("sched", S_IRUGO
|S_IWUSR
, proc_pid_sched_operations
),
2859 #ifdef CONFIG_SCHED_AUTOGROUP
2860 REG("autogroup", S_IRUGO
|S_IWUSR
, proc_pid_sched_autogroup_operations
),
2862 REG("comm", S_IRUGO
|S_IWUSR
, proc_pid_set_comm_operations
),
2863 #ifdef CONFIG_HAVE_ARCH_TRACEHOOK
2864 ONE("syscall", S_IRUSR
, proc_pid_syscall
),
2866 REG("cmdline", S_IRUGO
, proc_pid_cmdline_ops
),
2867 ONE("stat", S_IRUGO
, proc_tgid_stat
),
2868 ONE("statm", S_IRUGO
, proc_pid_statm
),
2869 REG("maps", S_IRUGO
, proc_pid_maps_operations
),
2871 REG("numa_maps", S_IRUGO
, proc_pid_numa_maps_operations
),
2873 REG("mem", S_IRUSR
|S_IWUSR
, proc_mem_operations
),
2874 LNK("cwd", proc_cwd_link
),
2875 LNK("root", proc_root_link
),
2876 LNK("exe", proc_exe_link
),
2877 REG("mounts", S_IRUGO
, proc_mounts_operations
),
2878 REG("mountinfo", S_IRUGO
, proc_mountinfo_operations
),
2879 REG("mountstats", S_IRUSR
, proc_mountstats_operations
),
2880 #ifdef CONFIG_PROC_PAGE_MONITOR
2881 REG("clear_refs", S_IWUSR
, proc_clear_refs_operations
),
2882 REG("smaps", S_IRUGO
, proc_pid_smaps_operations
),
2883 REG("pagemap", S_IRUSR
, proc_pagemap_operations
),
2885 #ifdef CONFIG_SECURITY
2886 DIR("attr", S_IRUGO
|S_IXUGO
, proc_attr_dir_inode_operations
, proc_attr_dir_operations
),
2888 #ifdef CONFIG_KALLSYMS
2889 ONE("wchan", S_IRUGO
, proc_pid_wchan
),
2891 #ifdef CONFIG_STACKTRACE
2892 ONE("stack", S_IRUSR
, proc_pid_stack
),
2894 #ifdef CONFIG_SCHED_INFO
2895 ONE("schedstat", S_IRUGO
, proc_pid_schedstat
),
2897 #ifdef CONFIG_LATENCYTOP
2898 REG("latency", S_IRUGO
, proc_lstats_operations
),
2900 #ifdef CONFIG_PROC_PID_CPUSET
2901 ONE("cpuset", S_IRUGO
, proc_cpuset_show
),
2903 #ifdef CONFIG_CGROUPS
2904 ONE("cgroup", S_IRUGO
, proc_cgroup_show
),
2906 ONE("oom_score", S_IRUGO
, proc_oom_score
),
2907 REG("oom_adj", S_IRUGO
|S_IWUSR
, proc_oom_adj_operations
),
2908 REG("oom_score_adj", S_IRUGO
|S_IWUSR
, proc_oom_score_adj_operations
),
2909 #ifdef CONFIG_AUDITSYSCALL
2910 REG("loginuid", S_IWUSR
|S_IRUGO
, proc_loginuid_operations
),
2911 REG("sessionid", S_IRUGO
, proc_sessionid_operations
),
2913 #ifdef CONFIG_FAULT_INJECTION
2914 REG("make-it-fail", S_IRUGO
|S_IWUSR
, proc_fault_inject_operations
),
2916 #ifdef CONFIG_ELF_CORE
2917 REG("coredump_filter", S_IRUGO
|S_IWUSR
, proc_coredump_filter_operations
),
2919 #ifdef CONFIG_TASK_IO_ACCOUNTING
2920 ONE("io", S_IRUSR
, proc_tgid_io_accounting
),
2922 #ifdef CONFIG_HARDWALL
2923 ONE("hardwall", S_IRUGO
, proc_pid_hardwall
),
2925 #ifdef CONFIG_USER_NS
2926 REG("uid_map", S_IRUGO
|S_IWUSR
, proc_uid_map_operations
),
2927 REG("gid_map", S_IRUGO
|S_IWUSR
, proc_gid_map_operations
),
2928 REG("projid_map", S_IRUGO
|S_IWUSR
, proc_projid_map_operations
),
2929 REG("setgroups", S_IRUGO
|S_IWUSR
, proc_setgroups_operations
),
2931 #ifdef CONFIG_CHECKPOINT_RESTORE
2932 REG("timers", S_IRUGO
, proc_timers_operations
),
2934 REG("timerslack_ns", S_IRUGO
|S_IWUGO
, proc_pid_set_timerslack_ns_operations
),
2937 static int proc_tgid_base_readdir(struct file
*file
, struct dir_context
*ctx
)
2939 return proc_pident_readdir(file
, ctx
,
2940 tgid_base_stuff
, ARRAY_SIZE(tgid_base_stuff
));
2943 static const struct file_operations proc_tgid_base_operations
= {
2944 .read
= generic_read_dir
,
2945 .iterate_shared
= proc_tgid_base_readdir
,
2946 .llseek
= generic_file_llseek
,
2949 static struct dentry
*proc_tgid_base_lookup(struct inode
*dir
, struct dentry
*dentry
, unsigned int flags
)
2951 return proc_pident_lookup(dir
, dentry
,
2952 tgid_base_stuff
, ARRAY_SIZE(tgid_base_stuff
));
2955 static const struct inode_operations proc_tgid_base_inode_operations
= {
2956 .lookup
= proc_tgid_base_lookup
,
2957 .getattr
= pid_getattr
,
2958 .setattr
= proc_setattr
,
2959 .permission
= proc_pid_permission
,
2962 static void proc_flush_task_mnt(struct vfsmount
*mnt
, pid_t pid
, pid_t tgid
)
2964 struct dentry
*dentry
, *leader
, *dir
;
2965 char buf
[PROC_NUMBUF
];
2969 name
.len
= snprintf(buf
, sizeof(buf
), "%d", pid
);
2970 /* no ->d_hash() rejects on procfs */
2971 dentry
= d_hash_and_lookup(mnt
->mnt_root
, &name
);
2973 d_invalidate(dentry
);
2981 name
.len
= snprintf(buf
, sizeof(buf
), "%d", tgid
);
2982 leader
= d_hash_and_lookup(mnt
->mnt_root
, &name
);
2987 name
.len
= strlen(name
.name
);
2988 dir
= d_hash_and_lookup(leader
, &name
);
2990 goto out_put_leader
;
2993 name
.len
= snprintf(buf
, sizeof(buf
), "%d", pid
);
2994 dentry
= d_hash_and_lookup(dir
, &name
);
2996 d_invalidate(dentry
);
3008 * proc_flush_task - Remove dcache entries for @task from the /proc dcache.
3009 * @task: task that should be flushed.
3011 * When flushing dentries from proc, one needs to flush them from global
3012 * proc (proc_mnt) and from all the namespaces' procs this task was seen
3013 * in. This call is supposed to do all of this job.
3015 * Looks in the dcache for
3017 * /proc/@tgid/task/@pid
3018 * if either directory is present flushes it and all of it'ts children
3021 * It is safe and reasonable to cache /proc entries for a task until
3022 * that task exits. After that they just clog up the dcache with
3023 * useless entries, possibly causing useful dcache entries to be
3024 * flushed instead. This routine is proved to flush those useless
3025 * dcache entries at process exit time.
3027 * NOTE: This routine is just an optimization so it does not guarantee
3028 * that no dcache entries will exist at process exit time it
3029 * just makes it very unlikely that any will persist.
3032 void proc_flush_task(struct task_struct
*task
)
3035 struct pid
*pid
, *tgid
;
3038 pid
= task_pid(task
);
3039 tgid
= task_tgid(task
);
3041 for (i
= 0; i
<= pid
->level
; i
++) {
3042 upid
= &pid
->numbers
[i
];
3043 proc_flush_task_mnt(upid
->ns
->proc_mnt
, upid
->nr
,
3044 tgid
->numbers
[i
].nr
);
3048 static int proc_pid_instantiate(struct inode
*dir
,
3049 struct dentry
* dentry
,
3050 struct task_struct
*task
, const void *ptr
)
3052 struct inode
*inode
;
3054 inode
= proc_pid_make_inode(dir
->i_sb
, task
);
3058 inode
->i_mode
= S_IFDIR
|S_IRUGO
|S_IXUGO
;
3059 inode
->i_op
= &proc_tgid_base_inode_operations
;
3060 inode
->i_fop
= &proc_tgid_base_operations
;
3061 inode
->i_flags
|=S_IMMUTABLE
;
3063 set_nlink(inode
, 2 + pid_entry_count_dirs(tgid_base_stuff
,
3064 ARRAY_SIZE(tgid_base_stuff
)));
3066 d_set_d_op(dentry
, &pid_dentry_operations
);
3068 d_add(dentry
, inode
);
3069 /* Close the race of the process dying before we return the dentry */
3070 if (pid_revalidate(dentry
, 0))
3076 struct dentry
*proc_pid_lookup(struct inode
*dir
, struct dentry
* dentry
, unsigned int flags
)
3078 int result
= -ENOENT
;
3079 struct task_struct
*task
;
3081 struct pid_namespace
*ns
;
3083 tgid
= name_to_int(&dentry
->d_name
);
3087 ns
= dentry
->d_sb
->s_fs_info
;
3089 task
= find_task_by_pid_ns(tgid
, ns
);
3091 get_task_struct(task
);
3096 result
= proc_pid_instantiate(dir
, dentry
, task
, NULL
);
3097 put_task_struct(task
);
3099 return ERR_PTR(result
);
3103 * Find the first task with tgid >= tgid
3108 struct task_struct
*task
;
3110 static struct tgid_iter
next_tgid(struct pid_namespace
*ns
, struct tgid_iter iter
)
3115 put_task_struct(iter
.task
);
3119 pid
= find_ge_pid(iter
.tgid
, ns
);
3121 iter
.tgid
= pid_nr_ns(pid
, ns
);
3122 iter
.task
= pid_task(pid
, PIDTYPE_PID
);
3123 /* What we to know is if the pid we have find is the
3124 * pid of a thread_group_leader. Testing for task
3125 * being a thread_group_leader is the obvious thing
3126 * todo but there is a window when it fails, due to
3127 * the pid transfer logic in de_thread.
3129 * So we perform the straight forward test of seeing
3130 * if the pid we have found is the pid of a thread
3131 * group leader, and don't worry if the task we have
3132 * found doesn't happen to be a thread group leader.
3133 * As we don't care in the case of readdir.
3135 if (!iter
.task
|| !has_group_leader_pid(iter
.task
)) {
3139 get_task_struct(iter
.task
);
3145 #define TGID_OFFSET (FIRST_PROCESS_ENTRY + 2)
3147 /* for the /proc/ directory itself, after non-process stuff has been done */
3148 int proc_pid_readdir(struct file
*file
, struct dir_context
*ctx
)
3150 struct tgid_iter iter
;
3151 struct pid_namespace
*ns
= file_inode(file
)->i_sb
->s_fs_info
;
3152 loff_t pos
= ctx
->pos
;
3154 if (pos
>= PID_MAX_LIMIT
+ TGID_OFFSET
)
3157 if (pos
== TGID_OFFSET
- 2) {
3158 struct inode
*inode
= d_inode(ns
->proc_self
);
3159 if (!dir_emit(ctx
, "self", 4, inode
->i_ino
, DT_LNK
))
3161 ctx
->pos
= pos
= pos
+ 1;
3163 if (pos
== TGID_OFFSET
- 1) {
3164 struct inode
*inode
= d_inode(ns
->proc_thread_self
);
3165 if (!dir_emit(ctx
, "thread-self", 11, inode
->i_ino
, DT_LNK
))
3167 ctx
->pos
= pos
= pos
+ 1;
3169 iter
.tgid
= pos
- TGID_OFFSET
;
3171 for (iter
= next_tgid(ns
, iter
);
3173 iter
.tgid
+= 1, iter
= next_tgid(ns
, iter
)) {
3174 char name
[PROC_NUMBUF
];
3176 if (!has_pid_permissions(ns
, iter
.task
, 2))
3179 len
= snprintf(name
, sizeof(name
), "%d", iter
.tgid
);
3180 ctx
->pos
= iter
.tgid
+ TGID_OFFSET
;
3181 if (!proc_fill_cache(file
, ctx
, name
, len
,
3182 proc_pid_instantiate
, iter
.task
, NULL
)) {
3183 put_task_struct(iter
.task
);
3187 ctx
->pos
= PID_MAX_LIMIT
+ TGID_OFFSET
;
3192 * proc_tid_comm_permission is a special permission function exclusively
3193 * used for the node /proc/<pid>/task/<tid>/comm.
3194 * It bypasses generic permission checks in the case where a task of the same
3195 * task group attempts to access the node.
3196 * The rationale behind this is that glibc and bionic access this node for
3197 * cross thread naming (pthread_set/getname_np(!self)). However, if
3198 * PR_SET_DUMPABLE gets set to 0 this node among others becomes uid=0 gid=0,
3199 * which locks out the cross thread naming implementation.
3200 * This function makes sure that the node is always accessible for members of
3201 * same thread group.
3203 static int proc_tid_comm_permission(struct inode
*inode
, int mask
)
3205 bool is_same_tgroup
;
3206 struct task_struct
*task
;
3208 task
= get_proc_task(inode
);
3211 is_same_tgroup
= same_thread_group(current
, task
);
3212 put_task_struct(task
);
3214 if (likely(is_same_tgroup
&& !(mask
& MAY_EXEC
))) {
3215 /* This file (/proc/<pid>/task/<tid>/comm) can always be
3216 * read or written by the members of the corresponding
3222 return generic_permission(inode
, mask
);
3225 static const struct inode_operations proc_tid_comm_inode_operations
= {
3226 .permission
= proc_tid_comm_permission
,
3232 static const struct pid_entry tid_base_stuff
[] = {
3233 DIR("fd", S_IRUSR
|S_IXUSR
, proc_fd_inode_operations
, proc_fd_operations
),
3234 DIR("fdinfo", S_IRUSR
|S_IXUSR
, proc_fdinfo_inode_operations
, proc_fdinfo_operations
),
3235 DIR("ns", S_IRUSR
|S_IXUGO
, proc_ns_dir_inode_operations
, proc_ns_dir_operations
),
3237 DIR("net", S_IRUGO
|S_IXUGO
, proc_net_inode_operations
, proc_net_operations
),
3239 REG("environ", S_IRUSR
, proc_environ_operations
),
3240 REG("auxv", S_IRUSR
, proc_auxv_operations
),
3241 ONE("status", S_IRUGO
, proc_pid_status
),
3242 ONE("personality", S_IRUSR
, proc_pid_personality
),
3243 ONE("limits", S_IRUGO
, proc_pid_limits
),
3244 #ifdef CONFIG_SCHED_DEBUG
3245 REG("sched", S_IRUGO
|S_IWUSR
, proc_pid_sched_operations
),
3247 NOD("comm", S_IFREG
|S_IRUGO
|S_IWUSR
,
3248 &proc_tid_comm_inode_operations
,
3249 &proc_pid_set_comm_operations
, {}),
3250 #ifdef CONFIG_HAVE_ARCH_TRACEHOOK
3251 ONE("syscall", S_IRUSR
, proc_pid_syscall
),
3253 REG("cmdline", S_IRUGO
, proc_pid_cmdline_ops
),
3254 ONE("stat", S_IRUGO
, proc_tid_stat
),
3255 ONE("statm", S_IRUGO
, proc_pid_statm
),
3256 REG("maps", S_IRUGO
, proc_tid_maps_operations
),
3257 #ifdef CONFIG_PROC_CHILDREN
3258 REG("children", S_IRUGO
, proc_tid_children_operations
),
3261 REG("numa_maps", S_IRUGO
, proc_tid_numa_maps_operations
),
3263 REG("mem", S_IRUSR
|S_IWUSR
, proc_mem_operations
),
3264 LNK("cwd", proc_cwd_link
),
3265 LNK("root", proc_root_link
),
3266 LNK("exe", proc_exe_link
),
3267 REG("mounts", S_IRUGO
, proc_mounts_operations
),
3268 REG("mountinfo", S_IRUGO
, proc_mountinfo_operations
),
3269 #ifdef CONFIG_PROC_PAGE_MONITOR
3270 REG("clear_refs", S_IWUSR
, proc_clear_refs_operations
),
3271 REG("smaps", S_IRUGO
, proc_tid_smaps_operations
),
3272 REG("pagemap", S_IRUSR
, proc_pagemap_operations
),
3274 #ifdef CONFIG_SECURITY
3275 DIR("attr", S_IRUGO
|S_IXUGO
, proc_attr_dir_inode_operations
, proc_attr_dir_operations
),
3277 #ifdef CONFIG_KALLSYMS
3278 ONE("wchan", S_IRUGO
, proc_pid_wchan
),
3280 #ifdef CONFIG_STACKTRACE
3281 ONE("stack", S_IRUSR
, proc_pid_stack
),
3283 #ifdef CONFIG_SCHED_INFO
3284 ONE("schedstat", S_IRUGO
, proc_pid_schedstat
),
3286 #ifdef CONFIG_LATENCYTOP
3287 REG("latency", S_IRUGO
, proc_lstats_operations
),
3289 #ifdef CONFIG_PROC_PID_CPUSET
3290 ONE("cpuset", S_IRUGO
, proc_cpuset_show
),
3292 #ifdef CONFIG_CGROUPS
3293 ONE("cgroup", S_IRUGO
, proc_cgroup_show
),
3295 ONE("oom_score", S_IRUGO
, proc_oom_score
),
3296 REG("oom_adj", S_IRUGO
|S_IWUSR
, proc_oom_adj_operations
),
3297 REG("oom_score_adj", S_IRUGO
|S_IWUSR
, proc_oom_score_adj_operations
),
3298 #ifdef CONFIG_AUDITSYSCALL
3299 REG("loginuid", S_IWUSR
|S_IRUGO
, proc_loginuid_operations
),
3300 REG("sessionid", S_IRUGO
, proc_sessionid_operations
),
3302 #ifdef CONFIG_FAULT_INJECTION
3303 REG("make-it-fail", S_IRUGO
|S_IWUSR
, proc_fault_inject_operations
),
3305 #ifdef CONFIG_TASK_IO_ACCOUNTING
3306 ONE("io", S_IRUSR
, proc_tid_io_accounting
),
3308 #ifdef CONFIG_HARDWALL
3309 ONE("hardwall", S_IRUGO
, proc_pid_hardwall
),
3311 #ifdef CONFIG_USER_NS
3312 REG("uid_map", S_IRUGO
|S_IWUSR
, proc_uid_map_operations
),
3313 REG("gid_map", S_IRUGO
|S_IWUSR
, proc_gid_map_operations
),
3314 REG("projid_map", S_IRUGO
|S_IWUSR
, proc_projid_map_operations
),
3315 REG("setgroups", S_IRUGO
|S_IWUSR
, proc_setgroups_operations
),
3319 static int proc_tid_base_readdir(struct file
*file
, struct dir_context
*ctx
)
3321 return proc_pident_readdir(file
, ctx
,
3322 tid_base_stuff
, ARRAY_SIZE(tid_base_stuff
));
3325 static struct dentry
*proc_tid_base_lookup(struct inode
*dir
, struct dentry
*dentry
, unsigned int flags
)
3327 return proc_pident_lookup(dir
, dentry
,
3328 tid_base_stuff
, ARRAY_SIZE(tid_base_stuff
));
3331 static const struct file_operations proc_tid_base_operations
= {
3332 .read
= generic_read_dir
,
3333 .iterate_shared
= proc_tid_base_readdir
,
3334 .llseek
= generic_file_llseek
,
3337 static const struct inode_operations proc_tid_base_inode_operations
= {
3338 .lookup
= proc_tid_base_lookup
,
3339 .getattr
= pid_getattr
,
3340 .setattr
= proc_setattr
,
3343 static int proc_task_instantiate(struct inode
*dir
,
3344 struct dentry
*dentry
, struct task_struct
*task
, const void *ptr
)
3346 struct inode
*inode
;
3347 inode
= proc_pid_make_inode(dir
->i_sb
, task
);
3351 inode
->i_mode
= S_IFDIR
|S_IRUGO
|S_IXUGO
;
3352 inode
->i_op
= &proc_tid_base_inode_operations
;
3353 inode
->i_fop
= &proc_tid_base_operations
;
3354 inode
->i_flags
|=S_IMMUTABLE
;
3356 set_nlink(inode
, 2 + pid_entry_count_dirs(tid_base_stuff
,
3357 ARRAY_SIZE(tid_base_stuff
)));
3359 d_set_d_op(dentry
, &pid_dentry_operations
);
3361 d_add(dentry
, inode
);
3362 /* Close the race of the process dying before we return the dentry */
3363 if (pid_revalidate(dentry
, 0))
3369 static struct dentry
*proc_task_lookup(struct inode
*dir
, struct dentry
* dentry
, unsigned int flags
)
3371 int result
= -ENOENT
;
3372 struct task_struct
*task
;
3373 struct task_struct
*leader
= get_proc_task(dir
);
3375 struct pid_namespace
*ns
;
3380 tid
= name_to_int(&dentry
->d_name
);
3384 ns
= dentry
->d_sb
->s_fs_info
;
3386 task
= find_task_by_pid_ns(tid
, ns
);
3388 get_task_struct(task
);
3392 if (!same_thread_group(leader
, task
))
3395 result
= proc_task_instantiate(dir
, dentry
, task
, NULL
);
3397 put_task_struct(task
);
3399 put_task_struct(leader
);
3401 return ERR_PTR(result
);
3405 * Find the first tid of a thread group to return to user space.
3407 * Usually this is just the thread group leader, but if the users
3408 * buffer was too small or there was a seek into the middle of the
3409 * directory we have more work todo.
3411 * In the case of a short read we start with find_task_by_pid.
3413 * In the case of a seek we start with the leader and walk nr
3416 static struct task_struct
*first_tid(struct pid
*pid
, int tid
, loff_t f_pos
,
3417 struct pid_namespace
*ns
)
3419 struct task_struct
*pos
, *task
;
3420 unsigned long nr
= f_pos
;
3422 if (nr
!= f_pos
) /* 32bit overflow? */
3426 task
= pid_task(pid
, PIDTYPE_PID
);
3430 /* Attempt to start with the tid of a thread */
3432 pos
= find_task_by_pid_ns(tid
, ns
);
3433 if (pos
&& same_thread_group(pos
, task
))
3437 /* If nr exceeds the number of threads there is nothing todo */
3438 if (nr
>= get_nr_threads(task
))
3441 /* If we haven't found our starting place yet start
3442 * with the leader and walk nr threads forward.
3444 pos
= task
= task
->group_leader
;
3448 } while_each_thread(task
, pos
);
3453 get_task_struct(pos
);
3460 * Find the next thread in the thread list.
3461 * Return NULL if there is an error or no next thread.
3463 * The reference to the input task_struct is released.
3465 static struct task_struct
*next_tid(struct task_struct
*start
)
3467 struct task_struct
*pos
= NULL
;
3469 if (pid_alive(start
)) {
3470 pos
= next_thread(start
);
3471 if (thread_group_leader(pos
))
3474 get_task_struct(pos
);
3477 put_task_struct(start
);
3481 /* for the /proc/TGID/task/ directories */
3482 static int proc_task_readdir(struct file
*file
, struct dir_context
*ctx
)
3484 struct inode
*inode
= file_inode(file
);
3485 struct task_struct
*task
;
3486 struct pid_namespace
*ns
;
3489 if (proc_inode_is_dead(inode
))
3492 if (!dir_emit_dots(file
, ctx
))
3495 /* f_version caches the tgid value that the last readdir call couldn't
3496 * return. lseek aka telldir automagically resets f_version to 0.
3498 ns
= inode
->i_sb
->s_fs_info
;
3499 tid
= (int)file
->f_version
;
3500 file
->f_version
= 0;
3501 for (task
= first_tid(proc_pid(inode
), tid
, ctx
->pos
- 2, ns
);
3503 task
= next_tid(task
), ctx
->pos
++) {
3504 char name
[PROC_NUMBUF
];
3506 tid
= task_pid_nr_ns(task
, ns
);
3507 len
= snprintf(name
, sizeof(name
), "%d", tid
);
3508 if (!proc_fill_cache(file
, ctx
, name
, len
,
3509 proc_task_instantiate
, task
, NULL
)) {
3510 /* returning this tgid failed, save it as the first
3511 * pid for the next readir call */
3512 file
->f_version
= (u64
)tid
;
3513 put_task_struct(task
);
3521 static int proc_task_getattr(struct vfsmount
*mnt
, struct dentry
*dentry
, struct kstat
*stat
)
3523 struct inode
*inode
= d_inode(dentry
);
3524 struct task_struct
*p
= get_proc_task(inode
);
3525 generic_fillattr(inode
, stat
);
3528 stat
->nlink
+= get_nr_threads(p
);
3535 static const struct inode_operations proc_task_inode_operations
= {
3536 .lookup
= proc_task_lookup
,
3537 .getattr
= proc_task_getattr
,
3538 .setattr
= proc_setattr
,
3539 .permission
= proc_pid_permission
,
3542 static const struct file_operations proc_task_operations
= {
3543 .read
= generic_read_dir
,
3544 .iterate_shared
= proc_task_readdir
,
3545 .llseek
= generic_file_llseek
,