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 static int proc_pid_auxv(struct seq_file
*m
, struct pid_namespace
*ns
,
404 struct pid
*pid
, struct task_struct
*task
)
406 struct mm_struct
*mm
= mm_access(task
, PTRACE_MODE_READ_FSCREDS
);
407 if (mm
&& !IS_ERR(mm
)) {
408 unsigned int nwords
= 0;
411 } while (mm
->saved_auxv
[nwords
- 2] != 0); /* AT_NULL */
412 seq_write(m
, mm
->saved_auxv
, nwords
* sizeof(mm
->saved_auxv
[0]));
420 #ifdef CONFIG_KALLSYMS
422 * Provides a wchan file via kallsyms in a proper one-value-per-file format.
423 * Returns the resolved symbol. If that fails, simply return the address.
425 static int proc_pid_wchan(struct seq_file
*m
, struct pid_namespace
*ns
,
426 struct pid
*pid
, struct task_struct
*task
)
429 char symname
[KSYM_NAME_LEN
];
431 wchan
= get_wchan(task
);
433 if (wchan
&& ptrace_may_access(task
, PTRACE_MODE_READ_FSCREDS
)
434 && !lookup_symbol_name(wchan
, symname
))
435 seq_printf(m
, "%s", symname
);
441 #endif /* CONFIG_KALLSYMS */
443 static int lock_trace(struct task_struct
*task
)
445 int err
= mutex_lock_killable(&task
->signal
->cred_guard_mutex
);
448 if (!ptrace_may_access(task
, PTRACE_MODE_ATTACH_FSCREDS
)) {
449 mutex_unlock(&task
->signal
->cred_guard_mutex
);
455 static void unlock_trace(struct task_struct
*task
)
457 mutex_unlock(&task
->signal
->cred_guard_mutex
);
460 #ifdef CONFIG_STACKTRACE
462 #define MAX_STACK_TRACE_DEPTH 64
464 static int proc_pid_stack(struct seq_file
*m
, struct pid_namespace
*ns
,
465 struct pid
*pid
, struct task_struct
*task
)
467 struct stack_trace trace
;
468 unsigned long *entries
;
472 entries
= kmalloc(MAX_STACK_TRACE_DEPTH
* sizeof(*entries
), GFP_KERNEL
);
476 trace
.nr_entries
= 0;
477 trace
.max_entries
= MAX_STACK_TRACE_DEPTH
;
478 trace
.entries
= entries
;
481 err
= lock_trace(task
);
483 save_stack_trace_tsk(task
, &trace
);
485 for (i
= 0; i
< trace
.nr_entries
; i
++) {
486 seq_printf(m
, "[<%pK>] %pS\n",
487 (void *)entries
[i
], (void *)entries
[i
]);
497 #ifdef CONFIG_SCHED_INFO
499 * Provides /proc/PID/schedstat
501 static int proc_pid_schedstat(struct seq_file
*m
, struct pid_namespace
*ns
,
502 struct pid
*pid
, struct task_struct
*task
)
504 if (unlikely(!sched_info_on()))
505 seq_printf(m
, "0 0 0\n");
507 seq_printf(m
, "%llu %llu %lu\n",
508 (unsigned long long)task
->se
.sum_exec_runtime
,
509 (unsigned long long)task
->sched_info
.run_delay
,
510 task
->sched_info
.pcount
);
516 #ifdef CONFIG_LATENCYTOP
517 static int lstats_show_proc(struct seq_file
*m
, void *v
)
520 struct inode
*inode
= m
->private;
521 struct task_struct
*task
= get_proc_task(inode
);
525 seq_puts(m
, "Latency Top version : v0.1\n");
526 for (i
= 0; i
< 32; i
++) {
527 struct latency_record
*lr
= &task
->latency_record
[i
];
528 if (lr
->backtrace
[0]) {
530 seq_printf(m
, "%i %li %li",
531 lr
->count
, lr
->time
, lr
->max
);
532 for (q
= 0; q
< LT_BACKTRACEDEPTH
; q
++) {
533 unsigned long bt
= lr
->backtrace
[q
];
538 seq_printf(m
, " %ps", (void *)bt
);
544 put_task_struct(task
);
548 static int lstats_open(struct inode
*inode
, struct file
*file
)
550 return single_open(file
, lstats_show_proc
, inode
);
553 static ssize_t
lstats_write(struct file
*file
, const char __user
*buf
,
554 size_t count
, loff_t
*offs
)
556 struct task_struct
*task
= get_proc_task(file_inode(file
));
560 clear_all_latency_tracing(task
);
561 put_task_struct(task
);
566 static const struct file_operations proc_lstats_operations
= {
569 .write
= lstats_write
,
571 .release
= single_release
,
576 static int proc_oom_score(struct seq_file
*m
, struct pid_namespace
*ns
,
577 struct pid
*pid
, struct task_struct
*task
)
579 unsigned long totalpages
= totalram_pages
+ total_swap_pages
;
580 unsigned long points
= 0;
582 read_lock(&tasklist_lock
);
584 points
= oom_badness(task
, NULL
, NULL
, totalpages
) *
586 read_unlock(&tasklist_lock
);
587 seq_printf(m
, "%lu\n", points
);
597 static const struct limit_names lnames
[RLIM_NLIMITS
] = {
598 [RLIMIT_CPU
] = {"Max cpu time", "seconds"},
599 [RLIMIT_FSIZE
] = {"Max file size", "bytes"},
600 [RLIMIT_DATA
] = {"Max data size", "bytes"},
601 [RLIMIT_STACK
] = {"Max stack size", "bytes"},
602 [RLIMIT_CORE
] = {"Max core file size", "bytes"},
603 [RLIMIT_RSS
] = {"Max resident set", "bytes"},
604 [RLIMIT_NPROC
] = {"Max processes", "processes"},
605 [RLIMIT_NOFILE
] = {"Max open files", "files"},
606 [RLIMIT_MEMLOCK
] = {"Max locked memory", "bytes"},
607 [RLIMIT_AS
] = {"Max address space", "bytes"},
608 [RLIMIT_LOCKS
] = {"Max file locks", "locks"},
609 [RLIMIT_SIGPENDING
] = {"Max pending signals", "signals"},
610 [RLIMIT_MSGQUEUE
] = {"Max msgqueue size", "bytes"},
611 [RLIMIT_NICE
] = {"Max nice priority", NULL
},
612 [RLIMIT_RTPRIO
] = {"Max realtime priority", NULL
},
613 [RLIMIT_RTTIME
] = {"Max realtime timeout", "us"},
616 /* Display limits for a process */
617 static int proc_pid_limits(struct seq_file
*m
, struct pid_namespace
*ns
,
618 struct pid
*pid
, struct task_struct
*task
)
623 struct rlimit rlim
[RLIM_NLIMITS
];
625 if (!lock_task_sighand(task
, &flags
))
627 memcpy(rlim
, task
->signal
->rlim
, sizeof(struct rlimit
) * RLIM_NLIMITS
);
628 unlock_task_sighand(task
, &flags
);
631 * print the file header
633 seq_printf(m
, "%-25s %-20s %-20s %-10s\n",
634 "Limit", "Soft Limit", "Hard Limit", "Units");
636 for (i
= 0; i
< RLIM_NLIMITS
; i
++) {
637 if (rlim
[i
].rlim_cur
== RLIM_INFINITY
)
638 seq_printf(m
, "%-25s %-20s ",
639 lnames
[i
].name
, "unlimited");
641 seq_printf(m
, "%-25s %-20lu ",
642 lnames
[i
].name
, rlim
[i
].rlim_cur
);
644 if (rlim
[i
].rlim_max
== RLIM_INFINITY
)
645 seq_printf(m
, "%-20s ", "unlimited");
647 seq_printf(m
, "%-20lu ", rlim
[i
].rlim_max
);
650 seq_printf(m
, "%-10s\n", lnames
[i
].unit
);
658 #ifdef CONFIG_HAVE_ARCH_TRACEHOOK
659 static int proc_pid_syscall(struct seq_file
*m
, struct pid_namespace
*ns
,
660 struct pid
*pid
, struct task_struct
*task
)
663 unsigned long args
[6], sp
, pc
;
666 res
= lock_trace(task
);
670 if (task_current_syscall(task
, &nr
, args
, 6, &sp
, &pc
))
671 seq_puts(m
, "running\n");
673 seq_printf(m
, "%ld 0x%lx 0x%lx\n", nr
, sp
, pc
);
676 "%ld 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx\n",
678 args
[0], args
[1], args
[2], args
[3], args
[4], args
[5],
684 #endif /* CONFIG_HAVE_ARCH_TRACEHOOK */
686 /************************************************************************/
687 /* Here the fs part begins */
688 /************************************************************************/
690 /* permission checks */
691 static int proc_fd_access_allowed(struct inode
*inode
)
693 struct task_struct
*task
;
695 /* Allow access to a task's file descriptors if it is us or we
696 * may use ptrace attach to the process and find out that
699 task
= get_proc_task(inode
);
701 allowed
= ptrace_may_access(task
, PTRACE_MODE_READ_FSCREDS
);
702 put_task_struct(task
);
707 int proc_setattr(struct dentry
*dentry
, struct iattr
*attr
)
710 struct inode
*inode
= d_inode(dentry
);
712 if (attr
->ia_valid
& ATTR_MODE
)
715 error
= inode_change_ok(inode
, attr
);
719 setattr_copy(inode
, attr
);
720 mark_inode_dirty(inode
);
725 * May current process learn task's sched/cmdline info (for hide_pid_min=1)
726 * or euid/egid (for hide_pid_min=2)?
728 static bool has_pid_permissions(struct pid_namespace
*pid
,
729 struct task_struct
*task
,
732 if (pid
->hide_pid
< hide_pid_min
)
734 if (in_group_p(pid
->pid_gid
))
736 return ptrace_may_access(task
, PTRACE_MODE_READ_FSCREDS
);
740 static int proc_pid_permission(struct inode
*inode
, int mask
)
742 struct pid_namespace
*pid
= inode
->i_sb
->s_fs_info
;
743 struct task_struct
*task
;
746 task
= get_proc_task(inode
);
749 has_perms
= has_pid_permissions(pid
, task
, 1);
750 put_task_struct(task
);
753 if (pid
->hide_pid
== 2) {
755 * Let's make getdents(), stat(), and open()
756 * consistent with each other. If a process
757 * may not stat() a file, it shouldn't be seen
765 return generic_permission(inode
, mask
);
770 static const struct inode_operations proc_def_inode_operations
= {
771 .setattr
= proc_setattr
,
774 static int proc_single_show(struct seq_file
*m
, void *v
)
776 struct inode
*inode
= m
->private;
777 struct pid_namespace
*ns
;
779 struct task_struct
*task
;
782 ns
= inode
->i_sb
->s_fs_info
;
783 pid
= proc_pid(inode
);
784 task
= get_pid_task(pid
, PIDTYPE_PID
);
788 ret
= PROC_I(inode
)->op
.proc_show(m
, ns
, pid
, task
);
790 put_task_struct(task
);
794 static int proc_single_open(struct inode
*inode
, struct file
*filp
)
796 return single_open(filp
, proc_single_show
, inode
);
799 static const struct file_operations proc_single_file_operations
= {
800 .open
= proc_single_open
,
803 .release
= single_release
,
807 struct mm_struct
*proc_mem_open(struct inode
*inode
, unsigned int mode
)
809 struct task_struct
*task
= get_proc_task(inode
);
810 struct mm_struct
*mm
= ERR_PTR(-ESRCH
);
813 mm
= mm_access(task
, mode
| PTRACE_MODE_FSCREDS
);
814 put_task_struct(task
);
816 if (!IS_ERR_OR_NULL(mm
)) {
817 /* ensure this mm_struct can't be freed */
818 atomic_inc(&mm
->mm_count
);
819 /* but do not pin its memory */
827 static int __mem_open(struct inode
*inode
, struct file
*file
, unsigned int mode
)
829 struct mm_struct
*mm
= proc_mem_open(inode
, mode
);
834 file
->private_data
= mm
;
838 static int mem_open(struct inode
*inode
, struct file
*file
)
840 int ret
= __mem_open(inode
, file
, PTRACE_MODE_ATTACH
);
842 /* OK to pass negative loff_t, we can catch out-of-range */
843 file
->f_mode
|= FMODE_UNSIGNED_OFFSET
;
848 static ssize_t
mem_rw(struct file
*file
, char __user
*buf
,
849 size_t count
, loff_t
*ppos
, int write
)
851 struct mm_struct
*mm
= file
->private_data
;
852 unsigned long addr
= *ppos
;
859 page
= (char *)__get_free_page(GFP_TEMPORARY
);
864 if (!atomic_inc_not_zero(&mm
->mm_users
))
868 int this_len
= min_t(int, count
, PAGE_SIZE
);
870 if (write
&& copy_from_user(page
, buf
, this_len
)) {
875 this_len
= access_remote_vm(mm
, addr
, page
, this_len
, write
);
882 if (!write
&& copy_to_user(buf
, page
, this_len
)) {
896 free_page((unsigned long) page
);
900 static ssize_t
mem_read(struct file
*file
, char __user
*buf
,
901 size_t count
, loff_t
*ppos
)
903 return mem_rw(file
, buf
, count
, ppos
, 0);
906 static ssize_t
mem_write(struct file
*file
, const char __user
*buf
,
907 size_t count
, loff_t
*ppos
)
909 return mem_rw(file
, (char __user
*)buf
, count
, ppos
, 1);
912 loff_t
mem_lseek(struct file
*file
, loff_t offset
, int orig
)
916 file
->f_pos
= offset
;
919 file
->f_pos
+= offset
;
924 force_successful_syscall_return();
928 static int mem_release(struct inode
*inode
, struct file
*file
)
930 struct mm_struct
*mm
= file
->private_data
;
936 static const struct file_operations proc_mem_operations
= {
941 .release
= mem_release
,
944 static int environ_open(struct inode
*inode
, struct file
*file
)
946 return __mem_open(inode
, file
, PTRACE_MODE_READ
);
949 static ssize_t
environ_read(struct file
*file
, char __user
*buf
,
950 size_t count
, loff_t
*ppos
)
953 unsigned long src
= *ppos
;
955 struct mm_struct
*mm
= file
->private_data
;
956 unsigned long env_start
, env_end
;
958 /* Ensure the process spawned far enough to have an environment. */
959 if (!mm
|| !mm
->env_end
)
962 page
= (char *)__get_free_page(GFP_TEMPORARY
);
967 if (!atomic_inc_not_zero(&mm
->mm_users
))
970 down_read(&mm
->mmap_sem
);
971 env_start
= mm
->env_start
;
972 env_end
= mm
->env_end
;
973 up_read(&mm
->mmap_sem
);
976 size_t this_len
, max_len
;
979 if (src
>= (env_end
- env_start
))
982 this_len
= env_end
- (env_start
+ src
);
984 max_len
= min_t(size_t, PAGE_SIZE
, count
);
985 this_len
= min(max_len
, this_len
);
987 retval
= access_remote_vm(mm
, (env_start
+ src
),
995 if (copy_to_user(buf
, page
, retval
)) {
1009 free_page((unsigned long) page
);
1013 static const struct file_operations proc_environ_operations
= {
1014 .open
= environ_open
,
1015 .read
= environ_read
,
1016 .llseek
= generic_file_llseek
,
1017 .release
= mem_release
,
1020 static ssize_t
oom_adj_read(struct file
*file
, char __user
*buf
, size_t count
,
1023 struct task_struct
*task
= get_proc_task(file_inode(file
));
1024 char buffer
[PROC_NUMBUF
];
1025 int oom_adj
= OOM_ADJUST_MIN
;
1027 unsigned long flags
;
1031 if (lock_task_sighand(task
, &flags
)) {
1032 if (task
->signal
->oom_score_adj
== OOM_SCORE_ADJ_MAX
)
1033 oom_adj
= OOM_ADJUST_MAX
;
1035 oom_adj
= (task
->signal
->oom_score_adj
* -OOM_DISABLE
) /
1037 unlock_task_sighand(task
, &flags
);
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
);
1045 * /proc/pid/oom_adj exists solely for backwards compatibility with previous
1046 * kernels. The effective policy is defined by oom_score_adj, which has a
1047 * different scale: oom_adj grew exponentially and oom_score_adj grows linearly.
1048 * Values written to oom_adj are simply mapped linearly to oom_score_adj.
1049 * Processes that become oom disabled via oom_adj will still be oom disabled
1050 * with this implementation.
1052 * oom_adj cannot be removed since existing userspace binaries use it.
1054 static ssize_t
oom_adj_write(struct file
*file
, const char __user
*buf
,
1055 size_t count
, loff_t
*ppos
)
1057 struct task_struct
*task
;
1058 char buffer
[PROC_NUMBUF
];
1060 unsigned long flags
;
1063 memset(buffer
, 0, sizeof(buffer
));
1064 if (count
> sizeof(buffer
) - 1)
1065 count
= sizeof(buffer
) - 1;
1066 if (copy_from_user(buffer
, buf
, count
)) {
1071 err
= kstrtoint(strstrip(buffer
), 0, &oom_adj
);
1074 if ((oom_adj
< OOM_ADJUST_MIN
|| oom_adj
> OOM_ADJUST_MAX
) &&
1075 oom_adj
!= OOM_DISABLE
) {
1080 task
= get_proc_task(file_inode(file
));
1092 if (!lock_task_sighand(task
, &flags
)) {
1098 * Scale /proc/pid/oom_score_adj appropriately ensuring that a maximum
1099 * value is always attainable.
1101 if (oom_adj
== OOM_ADJUST_MAX
)
1102 oom_adj
= OOM_SCORE_ADJ_MAX
;
1104 oom_adj
= (oom_adj
* OOM_SCORE_ADJ_MAX
) / -OOM_DISABLE
;
1106 if (oom_adj
< task
->signal
->oom_score_adj
&&
1107 !capable(CAP_SYS_RESOURCE
)) {
1113 * /proc/pid/oom_adj is provided for legacy purposes, ask users to use
1114 * /proc/pid/oom_score_adj instead.
1116 pr_warn_once("%s (%d): /proc/%d/oom_adj is deprecated, please use /proc/%d/oom_score_adj instead.\n",
1117 current
->comm
, task_pid_nr(current
), task_pid_nr(task
),
1120 task
->signal
->oom_score_adj
= oom_adj
;
1121 trace_oom_score_adj_update(task
);
1123 unlock_task_sighand(task
, &flags
);
1126 put_task_struct(task
);
1128 return err
< 0 ? err
: count
;
1131 static const struct file_operations proc_oom_adj_operations
= {
1132 .read
= oom_adj_read
,
1133 .write
= oom_adj_write
,
1134 .llseek
= generic_file_llseek
,
1137 static ssize_t
oom_score_adj_read(struct file
*file
, char __user
*buf
,
1138 size_t count
, loff_t
*ppos
)
1140 struct task_struct
*task
= get_proc_task(file_inode(file
));
1141 char buffer
[PROC_NUMBUF
];
1142 short oom_score_adj
= OOM_SCORE_ADJ_MIN
;
1143 unsigned long flags
;
1148 if (lock_task_sighand(task
, &flags
)) {
1149 oom_score_adj
= task
->signal
->oom_score_adj
;
1150 unlock_task_sighand(task
, &flags
);
1152 put_task_struct(task
);
1153 len
= snprintf(buffer
, sizeof(buffer
), "%hd\n", oom_score_adj
);
1154 return simple_read_from_buffer(buf
, count
, ppos
, buffer
, len
);
1157 static ssize_t
oom_score_adj_write(struct file
*file
, const char __user
*buf
,
1158 size_t count
, loff_t
*ppos
)
1160 struct task_struct
*task
;
1161 char buffer
[PROC_NUMBUF
];
1162 unsigned long flags
;
1166 memset(buffer
, 0, sizeof(buffer
));
1167 if (count
> sizeof(buffer
) - 1)
1168 count
= sizeof(buffer
) - 1;
1169 if (copy_from_user(buffer
, buf
, count
)) {
1174 err
= kstrtoint(strstrip(buffer
), 0, &oom_score_adj
);
1177 if (oom_score_adj
< OOM_SCORE_ADJ_MIN
||
1178 oom_score_adj
> OOM_SCORE_ADJ_MAX
) {
1183 task
= get_proc_task(file_inode(file
));
1195 if (!lock_task_sighand(task
, &flags
)) {
1200 if ((short)oom_score_adj
< task
->signal
->oom_score_adj_min
&&
1201 !capable(CAP_SYS_RESOURCE
)) {
1206 task
->signal
->oom_score_adj
= (short)oom_score_adj
;
1207 if (has_capability_noaudit(current
, CAP_SYS_RESOURCE
))
1208 task
->signal
->oom_score_adj_min
= (short)oom_score_adj
;
1209 trace_oom_score_adj_update(task
);
1212 unlock_task_sighand(task
, &flags
);
1215 put_task_struct(task
);
1217 return err
< 0 ? err
: count
;
1220 static const struct file_operations proc_oom_score_adj_operations
= {
1221 .read
= oom_score_adj_read
,
1222 .write
= oom_score_adj_write
,
1223 .llseek
= default_llseek
,
1226 #ifdef CONFIG_AUDITSYSCALL
1227 #define TMPBUFLEN 21
1228 static ssize_t
proc_loginuid_read(struct file
* file
, char __user
* buf
,
1229 size_t count
, loff_t
*ppos
)
1231 struct inode
* inode
= file_inode(file
);
1232 struct task_struct
*task
= get_proc_task(inode
);
1234 char tmpbuf
[TMPBUFLEN
];
1238 length
= scnprintf(tmpbuf
, TMPBUFLEN
, "%u",
1239 from_kuid(file
->f_cred
->user_ns
,
1240 audit_get_loginuid(task
)));
1241 put_task_struct(task
);
1242 return simple_read_from_buffer(buf
, count
, ppos
, tmpbuf
, length
);
1245 static ssize_t
proc_loginuid_write(struct file
* file
, const char __user
* buf
,
1246 size_t count
, loff_t
*ppos
)
1248 struct inode
* inode
= file_inode(file
);
1254 if (current
!= pid_task(proc_pid(inode
), PIDTYPE_PID
)) {
1261 /* No partial writes. */
1265 rv
= kstrtou32_from_user(buf
, count
, 10, &loginuid
);
1269 /* is userspace tring to explicitly UNSET the loginuid? */
1270 if (loginuid
== AUDIT_UID_UNSET
) {
1271 kloginuid
= INVALID_UID
;
1273 kloginuid
= make_kuid(file
->f_cred
->user_ns
, loginuid
);
1274 if (!uid_valid(kloginuid
))
1278 rv
= audit_set_loginuid(kloginuid
);
1284 static const struct file_operations proc_loginuid_operations
= {
1285 .read
= proc_loginuid_read
,
1286 .write
= proc_loginuid_write
,
1287 .llseek
= generic_file_llseek
,
1290 static ssize_t
proc_sessionid_read(struct file
* file
, char __user
* buf
,
1291 size_t count
, loff_t
*ppos
)
1293 struct inode
* inode
= file_inode(file
);
1294 struct task_struct
*task
= get_proc_task(inode
);
1296 char tmpbuf
[TMPBUFLEN
];
1300 length
= scnprintf(tmpbuf
, TMPBUFLEN
, "%u",
1301 audit_get_sessionid(task
));
1302 put_task_struct(task
);
1303 return simple_read_from_buffer(buf
, count
, ppos
, tmpbuf
, length
);
1306 static const struct file_operations proc_sessionid_operations
= {
1307 .read
= proc_sessionid_read
,
1308 .llseek
= generic_file_llseek
,
1312 #ifdef CONFIG_FAULT_INJECTION
1313 static ssize_t
proc_fault_inject_read(struct file
* file
, char __user
* buf
,
1314 size_t count
, loff_t
*ppos
)
1316 struct task_struct
*task
= get_proc_task(file_inode(file
));
1317 char buffer
[PROC_NUMBUF
];
1323 make_it_fail
= task
->make_it_fail
;
1324 put_task_struct(task
);
1326 len
= snprintf(buffer
, sizeof(buffer
), "%i\n", make_it_fail
);
1328 return simple_read_from_buffer(buf
, count
, ppos
, buffer
, len
);
1331 static ssize_t
proc_fault_inject_write(struct file
* file
,
1332 const char __user
* buf
, size_t count
, loff_t
*ppos
)
1334 struct task_struct
*task
;
1335 char buffer
[PROC_NUMBUF
];
1339 if (!capable(CAP_SYS_RESOURCE
))
1341 memset(buffer
, 0, sizeof(buffer
));
1342 if (count
> sizeof(buffer
) - 1)
1343 count
= sizeof(buffer
) - 1;
1344 if (copy_from_user(buffer
, buf
, count
))
1346 rv
= kstrtoint(strstrip(buffer
), 0, &make_it_fail
);
1349 if (make_it_fail
< 0 || make_it_fail
> 1)
1352 task
= get_proc_task(file_inode(file
));
1355 task
->make_it_fail
= make_it_fail
;
1356 put_task_struct(task
);
1361 static const struct file_operations proc_fault_inject_operations
= {
1362 .read
= proc_fault_inject_read
,
1363 .write
= proc_fault_inject_write
,
1364 .llseek
= generic_file_llseek
,
1369 #ifdef CONFIG_SCHED_DEBUG
1371 * Print out various scheduling related per-task fields:
1373 static int sched_show(struct seq_file
*m
, void *v
)
1375 struct inode
*inode
= m
->private;
1376 struct task_struct
*p
;
1378 p
= get_proc_task(inode
);
1381 proc_sched_show_task(p
, m
);
1389 sched_write(struct file
*file
, const char __user
*buf
,
1390 size_t count
, loff_t
*offset
)
1392 struct inode
*inode
= file_inode(file
);
1393 struct task_struct
*p
;
1395 p
= get_proc_task(inode
);
1398 proc_sched_set_task(p
);
1405 static int sched_open(struct inode
*inode
, struct file
*filp
)
1407 return single_open(filp
, sched_show
, inode
);
1410 static const struct file_operations proc_pid_sched_operations
= {
1413 .write
= sched_write
,
1414 .llseek
= seq_lseek
,
1415 .release
= single_release
,
1420 #ifdef CONFIG_SCHED_AUTOGROUP
1422 * Print out autogroup related information:
1424 static int sched_autogroup_show(struct seq_file
*m
, void *v
)
1426 struct inode
*inode
= m
->private;
1427 struct task_struct
*p
;
1429 p
= get_proc_task(inode
);
1432 proc_sched_autogroup_show_task(p
, m
);
1440 sched_autogroup_write(struct file
*file
, const char __user
*buf
,
1441 size_t count
, loff_t
*offset
)
1443 struct inode
*inode
= file_inode(file
);
1444 struct task_struct
*p
;
1445 char buffer
[PROC_NUMBUF
];
1449 memset(buffer
, 0, sizeof(buffer
));
1450 if (count
> sizeof(buffer
) - 1)
1451 count
= sizeof(buffer
) - 1;
1452 if (copy_from_user(buffer
, buf
, count
))
1455 err
= kstrtoint(strstrip(buffer
), 0, &nice
);
1459 p
= get_proc_task(inode
);
1463 err
= proc_sched_autogroup_set_nice(p
, nice
);
1472 static int sched_autogroup_open(struct inode
*inode
, struct file
*filp
)
1476 ret
= single_open(filp
, sched_autogroup_show
, NULL
);
1478 struct seq_file
*m
= filp
->private_data
;
1485 static const struct file_operations proc_pid_sched_autogroup_operations
= {
1486 .open
= sched_autogroup_open
,
1488 .write
= sched_autogroup_write
,
1489 .llseek
= seq_lseek
,
1490 .release
= single_release
,
1493 #endif /* CONFIG_SCHED_AUTOGROUP */
1495 static ssize_t
comm_write(struct file
*file
, const char __user
*buf
,
1496 size_t count
, loff_t
*offset
)
1498 struct inode
*inode
= file_inode(file
);
1499 struct task_struct
*p
;
1500 char buffer
[TASK_COMM_LEN
];
1501 const size_t maxlen
= sizeof(buffer
) - 1;
1503 memset(buffer
, 0, sizeof(buffer
));
1504 if (copy_from_user(buffer
, buf
, count
> maxlen
? maxlen
: count
))
1507 p
= get_proc_task(inode
);
1511 if (same_thread_group(current
, p
))
1512 set_task_comm(p
, buffer
);
1521 static int comm_show(struct seq_file
*m
, void *v
)
1523 struct inode
*inode
= m
->private;
1524 struct task_struct
*p
;
1526 p
= get_proc_task(inode
);
1531 seq_printf(m
, "%s\n", p
->comm
);
1539 static int comm_open(struct inode
*inode
, struct file
*filp
)
1541 return single_open(filp
, comm_show
, inode
);
1544 static const struct file_operations proc_pid_set_comm_operations
= {
1547 .write
= comm_write
,
1548 .llseek
= seq_lseek
,
1549 .release
= single_release
,
1552 static int proc_exe_link(struct dentry
*dentry
, struct path
*exe_path
)
1554 struct task_struct
*task
;
1555 struct mm_struct
*mm
;
1556 struct file
*exe_file
;
1558 task
= get_proc_task(d_inode(dentry
));
1561 mm
= get_task_mm(task
);
1562 put_task_struct(task
);
1565 exe_file
= get_mm_exe_file(mm
);
1568 *exe_path
= exe_file
->f_path
;
1569 path_get(&exe_file
->f_path
);
1576 static const char *proc_pid_get_link(struct dentry
*dentry
,
1577 struct inode
*inode
,
1578 struct delayed_call
*done
)
1581 int error
= -EACCES
;
1584 return ERR_PTR(-ECHILD
);
1586 /* Are we allowed to snoop on the tasks file descriptors? */
1587 if (!proc_fd_access_allowed(inode
))
1590 error
= PROC_I(inode
)->op
.proc_get_link(dentry
, &path
);
1594 nd_jump_link(&path
);
1597 return ERR_PTR(error
);
1600 static int do_proc_readlink(struct path
*path
, char __user
*buffer
, int buflen
)
1602 char *tmp
= (char*)__get_free_page(GFP_TEMPORARY
);
1609 pathname
= d_path(path
, tmp
, PAGE_SIZE
);
1610 len
= PTR_ERR(pathname
);
1611 if (IS_ERR(pathname
))
1613 len
= tmp
+ PAGE_SIZE
- 1 - pathname
;
1617 if (copy_to_user(buffer
, pathname
, len
))
1620 free_page((unsigned long)tmp
);
1624 static int proc_pid_readlink(struct dentry
* dentry
, char __user
* buffer
, int buflen
)
1626 int error
= -EACCES
;
1627 struct inode
*inode
= d_inode(dentry
);
1630 /* Are we allowed to snoop on the tasks file descriptors? */
1631 if (!proc_fd_access_allowed(inode
))
1634 error
= PROC_I(inode
)->op
.proc_get_link(dentry
, &path
);
1638 error
= do_proc_readlink(&path
, buffer
, buflen
);
1644 const struct inode_operations proc_pid_link_inode_operations
= {
1645 .readlink
= proc_pid_readlink
,
1646 .get_link
= proc_pid_get_link
,
1647 .setattr
= proc_setattr
,
1651 /* building an inode */
1653 struct inode
*proc_pid_make_inode(struct super_block
* sb
, struct task_struct
*task
)
1655 struct inode
* inode
;
1656 struct proc_inode
*ei
;
1657 const struct cred
*cred
;
1659 /* We need a new inode */
1661 inode
= new_inode(sb
);
1667 inode
->i_ino
= get_next_ino();
1668 inode
->i_mtime
= inode
->i_atime
= inode
->i_ctime
= CURRENT_TIME
;
1669 inode
->i_op
= &proc_def_inode_operations
;
1672 * grab the reference to task.
1674 ei
->pid
= get_task_pid(task
, PIDTYPE_PID
);
1678 if (task_dumpable(task
)) {
1680 cred
= __task_cred(task
);
1681 inode
->i_uid
= cred
->euid
;
1682 inode
->i_gid
= cred
->egid
;
1685 security_task_to_inode(task
, inode
);
1695 int pid_getattr(struct vfsmount
*mnt
, struct dentry
*dentry
, struct kstat
*stat
)
1697 struct inode
*inode
= d_inode(dentry
);
1698 struct task_struct
*task
;
1699 const struct cred
*cred
;
1700 struct pid_namespace
*pid
= dentry
->d_sb
->s_fs_info
;
1702 generic_fillattr(inode
, stat
);
1705 stat
->uid
= GLOBAL_ROOT_UID
;
1706 stat
->gid
= GLOBAL_ROOT_GID
;
1707 task
= pid_task(proc_pid(inode
), PIDTYPE_PID
);
1709 if (!has_pid_permissions(pid
, task
, 2)) {
1712 * This doesn't prevent learning whether PID exists,
1713 * it only makes getattr() consistent with readdir().
1717 if ((inode
->i_mode
== (S_IFDIR
|S_IRUGO
|S_IXUGO
)) ||
1718 task_dumpable(task
)) {
1719 cred
= __task_cred(task
);
1720 stat
->uid
= cred
->euid
;
1721 stat
->gid
= cred
->egid
;
1731 * Exceptional case: normally we are not allowed to unhash a busy
1732 * directory. In this case, however, we can do it - no aliasing problems
1733 * due to the way we treat inodes.
1735 * Rewrite the inode's ownerships here because the owning task may have
1736 * performed a setuid(), etc.
1738 * Before the /proc/pid/status file was created the only way to read
1739 * the effective uid of a /process was to stat /proc/pid. Reading
1740 * /proc/pid/status is slow enough that procps and other packages
1741 * kept stating /proc/pid. To keep the rules in /proc simple I have
1742 * made this apply to all per process world readable and executable
1745 int pid_revalidate(struct dentry
*dentry
, unsigned int flags
)
1747 struct inode
*inode
;
1748 struct task_struct
*task
;
1749 const struct cred
*cred
;
1751 if (flags
& LOOKUP_RCU
)
1754 inode
= d_inode(dentry
);
1755 task
= get_proc_task(inode
);
1758 if ((inode
->i_mode
== (S_IFDIR
|S_IRUGO
|S_IXUGO
)) ||
1759 task_dumpable(task
)) {
1761 cred
= __task_cred(task
);
1762 inode
->i_uid
= cred
->euid
;
1763 inode
->i_gid
= cred
->egid
;
1766 inode
->i_uid
= GLOBAL_ROOT_UID
;
1767 inode
->i_gid
= GLOBAL_ROOT_GID
;
1769 inode
->i_mode
&= ~(S_ISUID
| S_ISGID
);
1770 security_task_to_inode(task
, inode
);
1771 put_task_struct(task
);
1777 static inline bool proc_inode_is_dead(struct inode
*inode
)
1779 return !proc_pid(inode
)->tasks
[PIDTYPE_PID
].first
;
1782 int pid_delete_dentry(const struct dentry
*dentry
)
1784 /* Is the task we represent dead?
1785 * If so, then don't put the dentry on the lru list,
1786 * kill it immediately.
1788 return proc_inode_is_dead(d_inode(dentry
));
1791 const struct dentry_operations pid_dentry_operations
=
1793 .d_revalidate
= pid_revalidate
,
1794 .d_delete
= pid_delete_dentry
,
1800 * Fill a directory entry.
1802 * If possible create the dcache entry and derive our inode number and
1803 * file type from dcache entry.
1805 * Since all of the proc inode numbers are dynamically generated, the inode
1806 * numbers do not exist until the inode is cache. This means creating the
1807 * the dcache entry in readdir is necessary to keep the inode numbers
1808 * reported by readdir in sync with the inode numbers reported
1811 bool proc_fill_cache(struct file
*file
, struct dir_context
*ctx
,
1812 const char *name
, int len
,
1813 instantiate_t instantiate
, struct task_struct
*task
, const void *ptr
)
1815 struct dentry
*child
, *dir
= file
->f_path
.dentry
;
1816 struct qstr qname
= QSTR_INIT(name
, len
);
1817 struct inode
*inode
;
1821 child
= d_hash_and_lookup(dir
, &qname
);
1823 child
= d_alloc(dir
, &qname
);
1825 goto end_instantiate
;
1826 if (instantiate(d_inode(dir
), child
, task
, ptr
) < 0) {
1828 goto end_instantiate
;
1831 inode
= d_inode(child
);
1833 type
= inode
->i_mode
>> 12;
1835 return dir_emit(ctx
, name
, len
, ino
, type
);
1838 return dir_emit(ctx
, name
, len
, 1, DT_UNKNOWN
);
1842 * dname_to_vma_addr - maps a dentry name into two unsigned longs
1843 * which represent vma start and end addresses.
1845 static int dname_to_vma_addr(struct dentry
*dentry
,
1846 unsigned long *start
, unsigned long *end
)
1848 if (sscanf(dentry
->d_name
.name
, "%lx-%lx", start
, end
) != 2)
1854 static int map_files_d_revalidate(struct dentry
*dentry
, unsigned int flags
)
1856 unsigned long vm_start
, vm_end
;
1857 bool exact_vma_exists
= false;
1858 struct mm_struct
*mm
= NULL
;
1859 struct task_struct
*task
;
1860 const struct cred
*cred
;
1861 struct inode
*inode
;
1864 if (flags
& LOOKUP_RCU
)
1867 inode
= d_inode(dentry
);
1868 task
= get_proc_task(inode
);
1872 mm
= mm_access(task
, PTRACE_MODE_READ_FSCREDS
);
1873 if (IS_ERR_OR_NULL(mm
))
1876 if (!dname_to_vma_addr(dentry
, &vm_start
, &vm_end
)) {
1877 down_read(&mm
->mmap_sem
);
1878 exact_vma_exists
= !!find_exact_vma(mm
, vm_start
, vm_end
);
1879 up_read(&mm
->mmap_sem
);
1884 if (exact_vma_exists
) {
1885 if (task_dumpable(task
)) {
1887 cred
= __task_cred(task
);
1888 inode
->i_uid
= cred
->euid
;
1889 inode
->i_gid
= cred
->egid
;
1892 inode
->i_uid
= GLOBAL_ROOT_UID
;
1893 inode
->i_gid
= GLOBAL_ROOT_GID
;
1895 security_task_to_inode(task
, inode
);
1900 put_task_struct(task
);
1906 static const struct dentry_operations tid_map_files_dentry_operations
= {
1907 .d_revalidate
= map_files_d_revalidate
,
1908 .d_delete
= pid_delete_dentry
,
1911 static int map_files_get_link(struct dentry
*dentry
, struct path
*path
)
1913 unsigned long vm_start
, vm_end
;
1914 struct vm_area_struct
*vma
;
1915 struct task_struct
*task
;
1916 struct mm_struct
*mm
;
1920 task
= get_proc_task(d_inode(dentry
));
1924 mm
= get_task_mm(task
);
1925 put_task_struct(task
);
1929 rc
= dname_to_vma_addr(dentry
, &vm_start
, &vm_end
);
1934 down_read(&mm
->mmap_sem
);
1935 vma
= find_exact_vma(mm
, vm_start
, vm_end
);
1936 if (vma
&& vma
->vm_file
) {
1937 *path
= vma
->vm_file
->f_path
;
1941 up_read(&mm
->mmap_sem
);
1949 struct map_files_info
{
1952 unsigned char name
[4*sizeof(long)+2]; /* max: %lx-%lx\0 */
1956 * Only allow CAP_SYS_ADMIN to follow the links, due to concerns about how the
1957 * symlinks may be used to bypass permissions on ancestor directories in the
1958 * path to the file in question.
1961 proc_map_files_get_link(struct dentry
*dentry
,
1962 struct inode
*inode
,
1963 struct delayed_call
*done
)
1965 if (!capable(CAP_SYS_ADMIN
))
1966 return ERR_PTR(-EPERM
);
1968 return proc_pid_get_link(dentry
, inode
, done
);
1972 * Identical to proc_pid_link_inode_operations except for get_link()
1974 static const struct inode_operations proc_map_files_link_inode_operations
= {
1975 .readlink
= proc_pid_readlink
,
1976 .get_link
= proc_map_files_get_link
,
1977 .setattr
= proc_setattr
,
1981 proc_map_files_instantiate(struct inode
*dir
, struct dentry
*dentry
,
1982 struct task_struct
*task
, const void *ptr
)
1984 fmode_t mode
= (fmode_t
)(unsigned long)ptr
;
1985 struct proc_inode
*ei
;
1986 struct inode
*inode
;
1988 inode
= proc_pid_make_inode(dir
->i_sb
, task
);
1993 ei
->op
.proc_get_link
= map_files_get_link
;
1995 inode
->i_op
= &proc_map_files_link_inode_operations
;
1997 inode
->i_mode
= S_IFLNK
;
1999 if (mode
& FMODE_READ
)
2000 inode
->i_mode
|= S_IRUSR
;
2001 if (mode
& FMODE_WRITE
)
2002 inode
->i_mode
|= S_IWUSR
;
2004 d_set_d_op(dentry
, &tid_map_files_dentry_operations
);
2005 d_add(dentry
, inode
);
2010 static struct dentry
*proc_map_files_lookup(struct inode
*dir
,
2011 struct dentry
*dentry
, unsigned int flags
)
2013 unsigned long vm_start
, vm_end
;
2014 struct vm_area_struct
*vma
;
2015 struct task_struct
*task
;
2017 struct mm_struct
*mm
;
2020 task
= get_proc_task(dir
);
2025 if (!ptrace_may_access(task
, PTRACE_MODE_READ_FSCREDS
))
2029 if (dname_to_vma_addr(dentry
, &vm_start
, &vm_end
))
2032 mm
= get_task_mm(task
);
2036 down_read(&mm
->mmap_sem
);
2037 vma
= find_exact_vma(mm
, vm_start
, vm_end
);
2042 result
= proc_map_files_instantiate(dir
, dentry
, task
,
2043 (void *)(unsigned long)vma
->vm_file
->f_mode
);
2046 up_read(&mm
->mmap_sem
);
2049 put_task_struct(task
);
2051 return ERR_PTR(result
);
2054 static const struct inode_operations proc_map_files_inode_operations
= {
2055 .lookup
= proc_map_files_lookup
,
2056 .permission
= proc_fd_permission
,
2057 .setattr
= proc_setattr
,
2061 proc_map_files_readdir(struct file
*file
, struct dir_context
*ctx
)
2063 struct vm_area_struct
*vma
;
2064 struct task_struct
*task
;
2065 struct mm_struct
*mm
;
2066 unsigned long nr_files
, pos
, i
;
2067 struct flex_array
*fa
= NULL
;
2068 struct map_files_info info
;
2069 struct map_files_info
*p
;
2073 task
= get_proc_task(file_inode(file
));
2078 if (!ptrace_may_access(task
, PTRACE_MODE_READ_FSCREDS
))
2082 if (!dir_emit_dots(file
, ctx
))
2085 mm
= get_task_mm(task
);
2088 down_read(&mm
->mmap_sem
);
2093 * We need two passes here:
2095 * 1) Collect vmas of mapped files with mmap_sem taken
2096 * 2) Release mmap_sem and instantiate entries
2098 * otherwise we get lockdep complained, since filldir()
2099 * routine might require mmap_sem taken in might_fault().
2102 for (vma
= mm
->mmap
, pos
= 2; vma
; vma
= vma
->vm_next
) {
2103 if (vma
->vm_file
&& ++pos
> ctx
->pos
)
2108 fa
= flex_array_alloc(sizeof(info
), nr_files
,
2110 if (!fa
|| flex_array_prealloc(fa
, 0, nr_files
,
2114 flex_array_free(fa
);
2115 up_read(&mm
->mmap_sem
);
2119 for (i
= 0, vma
= mm
->mmap
, pos
= 2; vma
;
2120 vma
= vma
->vm_next
) {
2123 if (++pos
<= ctx
->pos
)
2126 info
.mode
= vma
->vm_file
->f_mode
;
2127 info
.len
= snprintf(info
.name
,
2128 sizeof(info
.name
), "%lx-%lx",
2129 vma
->vm_start
, vma
->vm_end
);
2130 if (flex_array_put(fa
, i
++, &info
, GFP_KERNEL
))
2134 up_read(&mm
->mmap_sem
);
2136 for (i
= 0; i
< nr_files
; i
++) {
2137 p
= flex_array_get(fa
, i
);
2138 if (!proc_fill_cache(file
, ctx
,
2140 proc_map_files_instantiate
,
2142 (void *)(unsigned long)p
->mode
))
2147 flex_array_free(fa
);
2151 put_task_struct(task
);
2156 static const struct file_operations proc_map_files_operations
= {
2157 .read
= generic_read_dir
,
2158 .iterate
= proc_map_files_readdir
,
2159 .llseek
= default_llseek
,
2162 #ifdef CONFIG_CHECKPOINT_RESTORE
2163 struct timers_private
{
2165 struct task_struct
*task
;
2166 struct sighand_struct
*sighand
;
2167 struct pid_namespace
*ns
;
2168 unsigned long flags
;
2171 static void *timers_start(struct seq_file
*m
, loff_t
*pos
)
2173 struct timers_private
*tp
= m
->private;
2175 tp
->task
= get_pid_task(tp
->pid
, PIDTYPE_PID
);
2177 return ERR_PTR(-ESRCH
);
2179 tp
->sighand
= lock_task_sighand(tp
->task
, &tp
->flags
);
2181 return ERR_PTR(-ESRCH
);
2183 return seq_list_start(&tp
->task
->signal
->posix_timers
, *pos
);
2186 static void *timers_next(struct seq_file
*m
, void *v
, loff_t
*pos
)
2188 struct timers_private
*tp
= m
->private;
2189 return seq_list_next(v
, &tp
->task
->signal
->posix_timers
, pos
);
2192 static void timers_stop(struct seq_file
*m
, void *v
)
2194 struct timers_private
*tp
= m
->private;
2197 unlock_task_sighand(tp
->task
, &tp
->flags
);
2202 put_task_struct(tp
->task
);
2207 static int show_timer(struct seq_file
*m
, void *v
)
2209 struct k_itimer
*timer
;
2210 struct timers_private
*tp
= m
->private;
2212 static const char * const nstr
[] = {
2213 [SIGEV_SIGNAL
] = "signal",
2214 [SIGEV_NONE
] = "none",
2215 [SIGEV_THREAD
] = "thread",
2218 timer
= list_entry((struct list_head
*)v
, struct k_itimer
, list
);
2219 notify
= timer
->it_sigev_notify
;
2221 seq_printf(m
, "ID: %d\n", timer
->it_id
);
2222 seq_printf(m
, "signal: %d/%p\n",
2223 timer
->sigq
->info
.si_signo
,
2224 timer
->sigq
->info
.si_value
.sival_ptr
);
2225 seq_printf(m
, "notify: %s/%s.%d\n",
2226 nstr
[notify
& ~SIGEV_THREAD_ID
],
2227 (notify
& SIGEV_THREAD_ID
) ? "tid" : "pid",
2228 pid_nr_ns(timer
->it_pid
, tp
->ns
));
2229 seq_printf(m
, "ClockID: %d\n", timer
->it_clock
);
2234 static const struct seq_operations proc_timers_seq_ops
= {
2235 .start
= timers_start
,
2236 .next
= timers_next
,
2237 .stop
= timers_stop
,
2241 static int proc_timers_open(struct inode
*inode
, struct file
*file
)
2243 struct timers_private
*tp
;
2245 tp
= __seq_open_private(file
, &proc_timers_seq_ops
,
2246 sizeof(struct timers_private
));
2250 tp
->pid
= proc_pid(inode
);
2251 tp
->ns
= inode
->i_sb
->s_fs_info
;
2255 static const struct file_operations proc_timers_operations
= {
2256 .open
= proc_timers_open
,
2258 .llseek
= seq_lseek
,
2259 .release
= seq_release_private
,
2263 static ssize_t
timerslack_ns_write(struct file
*file
, const char __user
*buf
,
2264 size_t count
, loff_t
*offset
)
2266 struct inode
*inode
= file_inode(file
);
2267 struct task_struct
*p
;
2271 err
= kstrtoull_from_user(buf
, count
, 10, &slack_ns
);
2275 p
= get_proc_task(inode
);
2279 if (ptrace_may_access(p
, PTRACE_MODE_ATTACH_FSCREDS
)) {
2282 p
->timer_slack_ns
= p
->default_timer_slack_ns
;
2284 p
->timer_slack_ns
= slack_ns
;
2294 static int timerslack_ns_show(struct seq_file
*m
, void *v
)
2296 struct inode
*inode
= m
->private;
2297 struct task_struct
*p
;
2300 p
= get_proc_task(inode
);
2304 if (ptrace_may_access(p
, PTRACE_MODE_ATTACH_FSCREDS
)) {
2306 seq_printf(m
, "%llu\n", p
->timer_slack_ns
);
2316 static int timerslack_ns_open(struct inode
*inode
, struct file
*filp
)
2318 return single_open(filp
, timerslack_ns_show
, inode
);
2321 static const struct file_operations proc_pid_set_timerslack_ns_operations
= {
2322 .open
= timerslack_ns_open
,
2324 .write
= timerslack_ns_write
,
2325 .llseek
= seq_lseek
,
2326 .release
= single_release
,
2329 static int proc_pident_instantiate(struct inode
*dir
,
2330 struct dentry
*dentry
, struct task_struct
*task
, const void *ptr
)
2332 const struct pid_entry
*p
= ptr
;
2333 struct inode
*inode
;
2334 struct proc_inode
*ei
;
2336 inode
= proc_pid_make_inode(dir
->i_sb
, task
);
2341 inode
->i_mode
= p
->mode
;
2342 if (S_ISDIR(inode
->i_mode
))
2343 set_nlink(inode
, 2); /* Use getattr to fix if necessary */
2345 inode
->i_op
= p
->iop
;
2347 inode
->i_fop
= p
->fop
;
2349 d_set_d_op(dentry
, &pid_dentry_operations
);
2350 d_add(dentry
, inode
);
2351 /* Close the race of the process dying before we return the dentry */
2352 if (pid_revalidate(dentry
, 0))
2358 static struct dentry
*proc_pident_lookup(struct inode
*dir
,
2359 struct dentry
*dentry
,
2360 const struct pid_entry
*ents
,
2364 struct task_struct
*task
= get_proc_task(dir
);
2365 const struct pid_entry
*p
, *last
;
2373 * Yes, it does not scale. And it should not. Don't add
2374 * new entries into /proc/<tgid>/ without very good reasons.
2376 last
= &ents
[nents
- 1];
2377 for (p
= ents
; p
<= last
; p
++) {
2378 if (p
->len
!= dentry
->d_name
.len
)
2380 if (!memcmp(dentry
->d_name
.name
, p
->name
, p
->len
))
2386 error
= proc_pident_instantiate(dir
, dentry
, task
, p
);
2388 put_task_struct(task
);
2390 return ERR_PTR(error
);
2393 static int proc_pident_readdir(struct file
*file
, struct dir_context
*ctx
,
2394 const struct pid_entry
*ents
, unsigned int nents
)
2396 struct task_struct
*task
= get_proc_task(file_inode(file
));
2397 const struct pid_entry
*p
;
2402 if (!dir_emit_dots(file
, ctx
))
2405 if (ctx
->pos
>= nents
+ 2)
2408 for (p
= ents
+ (ctx
->pos
- 2); p
<= ents
+ nents
- 1; p
++) {
2409 if (!proc_fill_cache(file
, ctx
, p
->name
, p
->len
,
2410 proc_pident_instantiate
, task
, p
))
2415 put_task_struct(task
);
2419 #ifdef CONFIG_SECURITY
2420 static ssize_t
proc_pid_attr_read(struct file
* file
, char __user
* buf
,
2421 size_t count
, loff_t
*ppos
)
2423 struct inode
* inode
= file_inode(file
);
2426 struct task_struct
*task
= get_proc_task(inode
);
2431 length
= security_getprocattr(task
,
2432 (char*)file
->f_path
.dentry
->d_name
.name
,
2434 put_task_struct(task
);
2436 length
= simple_read_from_buffer(buf
, count
, ppos
, p
, length
);
2441 static ssize_t
proc_pid_attr_write(struct file
* file
, const 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 if (count
> PAGE_SIZE
)
2455 /* No partial writes. */
2460 page
= memdup_user(buf
, count
);
2462 length
= PTR_ERR(page
);
2466 /* Guard against adverse ptrace interaction */
2467 length
= mutex_lock_interruptible(&task
->signal
->cred_guard_mutex
);
2471 length
= security_setprocattr(task
,
2472 (char*)file
->f_path
.dentry
->d_name
.name
,
2474 mutex_unlock(&task
->signal
->cred_guard_mutex
);
2478 put_task_struct(task
);
2483 static const struct file_operations proc_pid_attr_operations
= {
2484 .read
= proc_pid_attr_read
,
2485 .write
= proc_pid_attr_write
,
2486 .llseek
= generic_file_llseek
,
2489 static const struct pid_entry attr_dir_stuff
[] = {
2490 REG("current", S_IRUGO
|S_IWUGO
, proc_pid_attr_operations
),
2491 REG("prev", S_IRUGO
, proc_pid_attr_operations
),
2492 REG("exec", S_IRUGO
|S_IWUGO
, proc_pid_attr_operations
),
2493 REG("fscreate", S_IRUGO
|S_IWUGO
, proc_pid_attr_operations
),
2494 REG("keycreate", S_IRUGO
|S_IWUGO
, proc_pid_attr_operations
),
2495 REG("sockcreate", S_IRUGO
|S_IWUGO
, proc_pid_attr_operations
),
2498 static int proc_attr_dir_readdir(struct file
*file
, struct dir_context
*ctx
)
2500 return proc_pident_readdir(file
, ctx
,
2501 attr_dir_stuff
, ARRAY_SIZE(attr_dir_stuff
));
2504 static const struct file_operations proc_attr_dir_operations
= {
2505 .read
= generic_read_dir
,
2506 .iterate
= proc_attr_dir_readdir
,
2507 .llseek
= default_llseek
,
2510 static struct dentry
*proc_attr_dir_lookup(struct inode
*dir
,
2511 struct dentry
*dentry
, unsigned int flags
)
2513 return proc_pident_lookup(dir
, dentry
,
2514 attr_dir_stuff
, ARRAY_SIZE(attr_dir_stuff
));
2517 static const struct inode_operations proc_attr_dir_inode_operations
= {
2518 .lookup
= proc_attr_dir_lookup
,
2519 .getattr
= pid_getattr
,
2520 .setattr
= proc_setattr
,
2525 #ifdef CONFIG_ELF_CORE
2526 static ssize_t
proc_coredump_filter_read(struct file
*file
, char __user
*buf
,
2527 size_t count
, loff_t
*ppos
)
2529 struct task_struct
*task
= get_proc_task(file_inode(file
));
2530 struct mm_struct
*mm
;
2531 char buffer
[PROC_NUMBUF
];
2539 mm
= get_task_mm(task
);
2541 len
= snprintf(buffer
, sizeof(buffer
), "%08lx\n",
2542 ((mm
->flags
& MMF_DUMP_FILTER_MASK
) >>
2543 MMF_DUMP_FILTER_SHIFT
));
2545 ret
= simple_read_from_buffer(buf
, count
, ppos
, buffer
, len
);
2548 put_task_struct(task
);
2553 static ssize_t
proc_coredump_filter_write(struct file
*file
,
2554 const char __user
*buf
,
2558 struct task_struct
*task
;
2559 struct mm_struct
*mm
;
2565 ret
= kstrtouint_from_user(buf
, count
, 0, &val
);
2570 task
= get_proc_task(file_inode(file
));
2574 mm
= get_task_mm(task
);
2579 for (i
= 0, mask
= 1; i
< MMF_DUMP_FILTER_BITS
; i
++, mask
<<= 1) {
2581 set_bit(i
+ MMF_DUMP_FILTER_SHIFT
, &mm
->flags
);
2583 clear_bit(i
+ MMF_DUMP_FILTER_SHIFT
, &mm
->flags
);
2588 put_task_struct(task
);
2595 static const struct file_operations proc_coredump_filter_operations
= {
2596 .read
= proc_coredump_filter_read
,
2597 .write
= proc_coredump_filter_write
,
2598 .llseek
= generic_file_llseek
,
2602 #ifdef CONFIG_TASK_IO_ACCOUNTING
2603 static int do_io_accounting(struct task_struct
*task
, struct seq_file
*m
, int whole
)
2605 struct task_io_accounting acct
= task
->ioac
;
2606 unsigned long flags
;
2609 result
= mutex_lock_killable(&task
->signal
->cred_guard_mutex
);
2613 if (!ptrace_may_access(task
, PTRACE_MODE_READ_FSCREDS
)) {
2618 if (whole
&& lock_task_sighand(task
, &flags
)) {
2619 struct task_struct
*t
= task
;
2621 task_io_accounting_add(&acct
, &task
->signal
->ioac
);
2622 while_each_thread(task
, t
)
2623 task_io_accounting_add(&acct
, &t
->ioac
);
2625 unlock_task_sighand(task
, &flags
);
2632 "read_bytes: %llu\n"
2633 "write_bytes: %llu\n"
2634 "cancelled_write_bytes: %llu\n",
2635 (unsigned long long)acct
.rchar
,
2636 (unsigned long long)acct
.wchar
,
2637 (unsigned long long)acct
.syscr
,
2638 (unsigned long long)acct
.syscw
,
2639 (unsigned long long)acct
.read_bytes
,
2640 (unsigned long long)acct
.write_bytes
,
2641 (unsigned long long)acct
.cancelled_write_bytes
);
2645 mutex_unlock(&task
->signal
->cred_guard_mutex
);
2649 static int proc_tid_io_accounting(struct seq_file
*m
, struct pid_namespace
*ns
,
2650 struct pid
*pid
, struct task_struct
*task
)
2652 return do_io_accounting(task
, m
, 0);
2655 static int proc_tgid_io_accounting(struct seq_file
*m
, struct pid_namespace
*ns
,
2656 struct pid
*pid
, struct task_struct
*task
)
2658 return do_io_accounting(task
, m
, 1);
2660 #endif /* CONFIG_TASK_IO_ACCOUNTING */
2662 #ifdef CONFIG_USER_NS
2663 static int proc_id_map_open(struct inode
*inode
, struct file
*file
,
2664 const struct seq_operations
*seq_ops
)
2666 struct user_namespace
*ns
= NULL
;
2667 struct task_struct
*task
;
2668 struct seq_file
*seq
;
2671 task
= get_proc_task(inode
);
2674 ns
= get_user_ns(task_cred_xxx(task
, user_ns
));
2676 put_task_struct(task
);
2681 ret
= seq_open(file
, seq_ops
);
2685 seq
= file
->private_data
;
2695 static int proc_id_map_release(struct inode
*inode
, struct file
*file
)
2697 struct seq_file
*seq
= file
->private_data
;
2698 struct user_namespace
*ns
= seq
->private;
2700 return seq_release(inode
, file
);
2703 static int proc_uid_map_open(struct inode
*inode
, struct file
*file
)
2705 return proc_id_map_open(inode
, file
, &proc_uid_seq_operations
);
2708 static int proc_gid_map_open(struct inode
*inode
, struct file
*file
)
2710 return proc_id_map_open(inode
, file
, &proc_gid_seq_operations
);
2713 static int proc_projid_map_open(struct inode
*inode
, struct file
*file
)
2715 return proc_id_map_open(inode
, file
, &proc_projid_seq_operations
);
2718 static const struct file_operations proc_uid_map_operations
= {
2719 .open
= proc_uid_map_open
,
2720 .write
= proc_uid_map_write
,
2722 .llseek
= seq_lseek
,
2723 .release
= proc_id_map_release
,
2726 static const struct file_operations proc_gid_map_operations
= {
2727 .open
= proc_gid_map_open
,
2728 .write
= proc_gid_map_write
,
2730 .llseek
= seq_lseek
,
2731 .release
= proc_id_map_release
,
2734 static const struct file_operations proc_projid_map_operations
= {
2735 .open
= proc_projid_map_open
,
2736 .write
= proc_projid_map_write
,
2738 .llseek
= seq_lseek
,
2739 .release
= proc_id_map_release
,
2742 static int proc_setgroups_open(struct inode
*inode
, struct file
*file
)
2744 struct user_namespace
*ns
= NULL
;
2745 struct task_struct
*task
;
2749 task
= get_proc_task(inode
);
2752 ns
= get_user_ns(task_cred_xxx(task
, user_ns
));
2754 put_task_struct(task
);
2759 if (file
->f_mode
& FMODE_WRITE
) {
2761 if (!ns_capable(ns
, CAP_SYS_ADMIN
))
2765 ret
= single_open(file
, &proc_setgroups_show
, ns
);
2776 static int proc_setgroups_release(struct inode
*inode
, struct file
*file
)
2778 struct seq_file
*seq
= file
->private_data
;
2779 struct user_namespace
*ns
= seq
->private;
2780 int ret
= single_release(inode
, file
);
2785 static const struct file_operations proc_setgroups_operations
= {
2786 .open
= proc_setgroups_open
,
2787 .write
= proc_setgroups_write
,
2789 .llseek
= seq_lseek
,
2790 .release
= proc_setgroups_release
,
2792 #endif /* CONFIG_USER_NS */
2794 static int proc_pid_personality(struct seq_file
*m
, struct pid_namespace
*ns
,
2795 struct pid
*pid
, struct task_struct
*task
)
2797 int err
= lock_trace(task
);
2799 seq_printf(m
, "%08x\n", task
->personality
);
2808 static const struct file_operations proc_task_operations
;
2809 static const struct inode_operations proc_task_inode_operations
;
2811 static const struct pid_entry tgid_base_stuff
[] = {
2812 DIR("task", S_IRUGO
|S_IXUGO
, proc_task_inode_operations
, proc_task_operations
),
2813 DIR("fd", S_IRUSR
|S_IXUSR
, proc_fd_inode_operations
, proc_fd_operations
),
2814 DIR("map_files", S_IRUSR
|S_IXUSR
, proc_map_files_inode_operations
, proc_map_files_operations
),
2815 DIR("fdinfo", S_IRUSR
|S_IXUSR
, proc_fdinfo_inode_operations
, proc_fdinfo_operations
),
2816 DIR("ns", S_IRUSR
|S_IXUGO
, proc_ns_dir_inode_operations
, proc_ns_dir_operations
),
2818 DIR("net", S_IRUGO
|S_IXUGO
, proc_net_inode_operations
, proc_net_operations
),
2820 REG("environ", S_IRUSR
, proc_environ_operations
),
2821 ONE("auxv", S_IRUSR
, proc_pid_auxv
),
2822 ONE("status", S_IRUGO
, proc_pid_status
),
2823 ONE("personality", S_IRUSR
, proc_pid_personality
),
2824 ONE("limits", S_IRUGO
, proc_pid_limits
),
2825 #ifdef CONFIG_SCHED_DEBUG
2826 REG("sched", S_IRUGO
|S_IWUSR
, proc_pid_sched_operations
),
2828 #ifdef CONFIG_SCHED_AUTOGROUP
2829 REG("autogroup", S_IRUGO
|S_IWUSR
, proc_pid_sched_autogroup_operations
),
2831 REG("comm", S_IRUGO
|S_IWUSR
, proc_pid_set_comm_operations
),
2832 #ifdef CONFIG_HAVE_ARCH_TRACEHOOK
2833 ONE("syscall", S_IRUSR
, proc_pid_syscall
),
2835 REG("cmdline", S_IRUGO
, proc_pid_cmdline_ops
),
2836 ONE("stat", S_IRUGO
, proc_tgid_stat
),
2837 ONE("statm", S_IRUGO
, proc_pid_statm
),
2838 REG("maps", S_IRUGO
, proc_pid_maps_operations
),
2840 REG("numa_maps", S_IRUGO
, proc_pid_numa_maps_operations
),
2842 REG("mem", S_IRUSR
|S_IWUSR
, proc_mem_operations
),
2843 LNK("cwd", proc_cwd_link
),
2844 LNK("root", proc_root_link
),
2845 LNK("exe", proc_exe_link
),
2846 REG("mounts", S_IRUGO
, proc_mounts_operations
),
2847 REG("mountinfo", S_IRUGO
, proc_mountinfo_operations
),
2848 REG("mountstats", S_IRUSR
, proc_mountstats_operations
),
2849 #ifdef CONFIG_PROC_PAGE_MONITOR
2850 REG("clear_refs", S_IWUSR
, proc_clear_refs_operations
),
2851 REG("smaps", S_IRUGO
, proc_pid_smaps_operations
),
2852 REG("pagemap", S_IRUSR
, proc_pagemap_operations
),
2854 #ifdef CONFIG_SECURITY
2855 DIR("attr", S_IRUGO
|S_IXUGO
, proc_attr_dir_inode_operations
, proc_attr_dir_operations
),
2857 #ifdef CONFIG_KALLSYMS
2858 ONE("wchan", S_IRUGO
, proc_pid_wchan
),
2860 #ifdef CONFIG_STACKTRACE
2861 ONE("stack", S_IRUSR
, proc_pid_stack
),
2863 #ifdef CONFIG_SCHED_INFO
2864 ONE("schedstat", S_IRUGO
, proc_pid_schedstat
),
2866 #ifdef CONFIG_LATENCYTOP
2867 REG("latency", S_IRUGO
, proc_lstats_operations
),
2869 #ifdef CONFIG_PROC_PID_CPUSET
2870 ONE("cpuset", S_IRUGO
, proc_cpuset_show
),
2872 #ifdef CONFIG_CGROUPS
2873 ONE("cgroup", S_IRUGO
, proc_cgroup_show
),
2875 ONE("oom_score", S_IRUGO
, proc_oom_score
),
2876 REG("oom_adj", S_IRUGO
|S_IWUSR
, proc_oom_adj_operations
),
2877 REG("oom_score_adj", S_IRUGO
|S_IWUSR
, proc_oom_score_adj_operations
),
2878 #ifdef CONFIG_AUDITSYSCALL
2879 REG("loginuid", S_IWUSR
|S_IRUGO
, proc_loginuid_operations
),
2880 REG("sessionid", S_IRUGO
, proc_sessionid_operations
),
2882 #ifdef CONFIG_FAULT_INJECTION
2883 REG("make-it-fail", S_IRUGO
|S_IWUSR
, proc_fault_inject_operations
),
2885 #ifdef CONFIG_ELF_CORE
2886 REG("coredump_filter", S_IRUGO
|S_IWUSR
, proc_coredump_filter_operations
),
2888 #ifdef CONFIG_TASK_IO_ACCOUNTING
2889 ONE("io", S_IRUSR
, proc_tgid_io_accounting
),
2891 #ifdef CONFIG_HARDWALL
2892 ONE("hardwall", S_IRUGO
, proc_pid_hardwall
),
2894 #ifdef CONFIG_USER_NS
2895 REG("uid_map", S_IRUGO
|S_IWUSR
, proc_uid_map_operations
),
2896 REG("gid_map", S_IRUGO
|S_IWUSR
, proc_gid_map_operations
),
2897 REG("projid_map", S_IRUGO
|S_IWUSR
, proc_projid_map_operations
),
2898 REG("setgroups", S_IRUGO
|S_IWUSR
, proc_setgroups_operations
),
2900 #ifdef CONFIG_CHECKPOINT_RESTORE
2901 REG("timers", S_IRUGO
, proc_timers_operations
),
2903 REG("timerslack_ns", S_IRUGO
|S_IWUGO
, proc_pid_set_timerslack_ns_operations
),
2906 static int proc_tgid_base_readdir(struct file
*file
, struct dir_context
*ctx
)
2908 return proc_pident_readdir(file
, ctx
,
2909 tgid_base_stuff
, ARRAY_SIZE(tgid_base_stuff
));
2912 static const struct file_operations proc_tgid_base_operations
= {
2913 .read
= generic_read_dir
,
2914 .iterate
= proc_tgid_base_readdir
,
2915 .llseek
= default_llseek
,
2918 static struct dentry
*proc_tgid_base_lookup(struct inode
*dir
, struct dentry
*dentry
, unsigned int flags
)
2920 return proc_pident_lookup(dir
, dentry
,
2921 tgid_base_stuff
, ARRAY_SIZE(tgid_base_stuff
));
2924 static const struct inode_operations proc_tgid_base_inode_operations
= {
2925 .lookup
= proc_tgid_base_lookup
,
2926 .getattr
= pid_getattr
,
2927 .setattr
= proc_setattr
,
2928 .permission
= proc_pid_permission
,
2931 static void proc_flush_task_mnt(struct vfsmount
*mnt
, pid_t pid
, pid_t tgid
)
2933 struct dentry
*dentry
, *leader
, *dir
;
2934 char buf
[PROC_NUMBUF
];
2938 name
.len
= snprintf(buf
, sizeof(buf
), "%d", pid
);
2939 /* no ->d_hash() rejects on procfs */
2940 dentry
= d_hash_and_lookup(mnt
->mnt_root
, &name
);
2942 d_invalidate(dentry
);
2950 name
.len
= snprintf(buf
, sizeof(buf
), "%d", tgid
);
2951 leader
= d_hash_and_lookup(mnt
->mnt_root
, &name
);
2956 name
.len
= strlen(name
.name
);
2957 dir
= d_hash_and_lookup(leader
, &name
);
2959 goto out_put_leader
;
2962 name
.len
= snprintf(buf
, sizeof(buf
), "%d", pid
);
2963 dentry
= d_hash_and_lookup(dir
, &name
);
2965 d_invalidate(dentry
);
2977 * proc_flush_task - Remove dcache entries for @task from the /proc dcache.
2978 * @task: task that should be flushed.
2980 * When flushing dentries from proc, one needs to flush them from global
2981 * proc (proc_mnt) and from all the namespaces' procs this task was seen
2982 * in. This call is supposed to do all of this job.
2984 * Looks in the dcache for
2986 * /proc/@tgid/task/@pid
2987 * if either directory is present flushes it and all of it'ts children
2990 * It is safe and reasonable to cache /proc entries for a task until
2991 * that task exits. After that they just clog up the dcache with
2992 * useless entries, possibly causing useful dcache entries to be
2993 * flushed instead. This routine is proved to flush those useless
2994 * dcache entries at process exit time.
2996 * NOTE: This routine is just an optimization so it does not guarantee
2997 * that no dcache entries will exist at process exit time it
2998 * just makes it very unlikely that any will persist.
3001 void proc_flush_task(struct task_struct
*task
)
3004 struct pid
*pid
, *tgid
;
3007 pid
= task_pid(task
);
3008 tgid
= task_tgid(task
);
3010 for (i
= 0; i
<= pid
->level
; i
++) {
3011 upid
= &pid
->numbers
[i
];
3012 proc_flush_task_mnt(upid
->ns
->proc_mnt
, upid
->nr
,
3013 tgid
->numbers
[i
].nr
);
3017 static int proc_pid_instantiate(struct inode
*dir
,
3018 struct dentry
* dentry
,
3019 struct task_struct
*task
, const void *ptr
)
3021 struct inode
*inode
;
3023 inode
= proc_pid_make_inode(dir
->i_sb
, task
);
3027 inode
->i_mode
= S_IFDIR
|S_IRUGO
|S_IXUGO
;
3028 inode
->i_op
= &proc_tgid_base_inode_operations
;
3029 inode
->i_fop
= &proc_tgid_base_operations
;
3030 inode
->i_flags
|=S_IMMUTABLE
;
3032 set_nlink(inode
, 2 + pid_entry_count_dirs(tgid_base_stuff
,
3033 ARRAY_SIZE(tgid_base_stuff
)));
3035 d_set_d_op(dentry
, &pid_dentry_operations
);
3037 d_add(dentry
, inode
);
3038 /* Close the race of the process dying before we return the dentry */
3039 if (pid_revalidate(dentry
, 0))
3045 struct dentry
*proc_pid_lookup(struct inode
*dir
, struct dentry
* dentry
, unsigned int flags
)
3047 int result
= -ENOENT
;
3048 struct task_struct
*task
;
3050 struct pid_namespace
*ns
;
3052 tgid
= name_to_int(&dentry
->d_name
);
3056 ns
= dentry
->d_sb
->s_fs_info
;
3058 task
= find_task_by_pid_ns(tgid
, ns
);
3060 get_task_struct(task
);
3065 result
= proc_pid_instantiate(dir
, dentry
, task
, NULL
);
3066 put_task_struct(task
);
3068 return ERR_PTR(result
);
3072 * Find the first task with tgid >= tgid
3077 struct task_struct
*task
;
3079 static struct tgid_iter
next_tgid(struct pid_namespace
*ns
, struct tgid_iter iter
)
3084 put_task_struct(iter
.task
);
3088 pid
= find_ge_pid(iter
.tgid
, ns
);
3090 iter
.tgid
= pid_nr_ns(pid
, ns
);
3091 iter
.task
= pid_task(pid
, PIDTYPE_PID
);
3092 /* What we to know is if the pid we have find is the
3093 * pid of a thread_group_leader. Testing for task
3094 * being a thread_group_leader is the obvious thing
3095 * todo but there is a window when it fails, due to
3096 * the pid transfer logic in de_thread.
3098 * So we perform the straight forward test of seeing
3099 * if the pid we have found is the pid of a thread
3100 * group leader, and don't worry if the task we have
3101 * found doesn't happen to be a thread group leader.
3102 * As we don't care in the case of readdir.
3104 if (!iter
.task
|| !has_group_leader_pid(iter
.task
)) {
3108 get_task_struct(iter
.task
);
3114 #define TGID_OFFSET (FIRST_PROCESS_ENTRY + 2)
3116 /* for the /proc/ directory itself, after non-process stuff has been done */
3117 int proc_pid_readdir(struct file
*file
, struct dir_context
*ctx
)
3119 struct tgid_iter iter
;
3120 struct pid_namespace
*ns
= file_inode(file
)->i_sb
->s_fs_info
;
3121 loff_t pos
= ctx
->pos
;
3123 if (pos
>= PID_MAX_LIMIT
+ TGID_OFFSET
)
3126 if (pos
== TGID_OFFSET
- 2) {
3127 struct inode
*inode
= d_inode(ns
->proc_self
);
3128 if (!dir_emit(ctx
, "self", 4, inode
->i_ino
, DT_LNK
))
3130 ctx
->pos
= pos
= pos
+ 1;
3132 if (pos
== TGID_OFFSET
- 1) {
3133 struct inode
*inode
= d_inode(ns
->proc_thread_self
);
3134 if (!dir_emit(ctx
, "thread-self", 11, inode
->i_ino
, DT_LNK
))
3136 ctx
->pos
= pos
= pos
+ 1;
3138 iter
.tgid
= pos
- TGID_OFFSET
;
3140 for (iter
= next_tgid(ns
, iter
);
3142 iter
.tgid
+= 1, iter
= next_tgid(ns
, iter
)) {
3143 char name
[PROC_NUMBUF
];
3145 if (!has_pid_permissions(ns
, iter
.task
, 2))
3148 len
= snprintf(name
, sizeof(name
), "%d", iter
.tgid
);
3149 ctx
->pos
= iter
.tgid
+ TGID_OFFSET
;
3150 if (!proc_fill_cache(file
, ctx
, name
, len
,
3151 proc_pid_instantiate
, iter
.task
, NULL
)) {
3152 put_task_struct(iter
.task
);
3156 ctx
->pos
= PID_MAX_LIMIT
+ TGID_OFFSET
;
3163 static const struct pid_entry tid_base_stuff
[] = {
3164 DIR("fd", S_IRUSR
|S_IXUSR
, proc_fd_inode_operations
, proc_fd_operations
),
3165 DIR("fdinfo", S_IRUSR
|S_IXUSR
, proc_fdinfo_inode_operations
, proc_fdinfo_operations
),
3166 DIR("ns", S_IRUSR
|S_IXUGO
, proc_ns_dir_inode_operations
, proc_ns_dir_operations
),
3168 DIR("net", S_IRUGO
|S_IXUGO
, proc_net_inode_operations
, proc_net_operations
),
3170 REG("environ", S_IRUSR
, proc_environ_operations
),
3171 ONE("auxv", S_IRUSR
, proc_pid_auxv
),
3172 ONE("status", S_IRUGO
, proc_pid_status
),
3173 ONE("personality", S_IRUSR
, proc_pid_personality
),
3174 ONE("limits", S_IRUGO
, proc_pid_limits
),
3175 #ifdef CONFIG_SCHED_DEBUG
3176 REG("sched", S_IRUGO
|S_IWUSR
, proc_pid_sched_operations
),
3178 REG("comm", S_IRUGO
|S_IWUSR
, proc_pid_set_comm_operations
),
3179 #ifdef CONFIG_HAVE_ARCH_TRACEHOOK
3180 ONE("syscall", S_IRUSR
, proc_pid_syscall
),
3182 REG("cmdline", S_IRUGO
, proc_pid_cmdline_ops
),
3183 ONE("stat", S_IRUGO
, proc_tid_stat
),
3184 ONE("statm", S_IRUGO
, proc_pid_statm
),
3185 REG("maps", S_IRUGO
, proc_tid_maps_operations
),
3186 #ifdef CONFIG_PROC_CHILDREN
3187 REG("children", S_IRUGO
, proc_tid_children_operations
),
3190 REG("numa_maps", S_IRUGO
, proc_tid_numa_maps_operations
),
3192 REG("mem", S_IRUSR
|S_IWUSR
, proc_mem_operations
),
3193 LNK("cwd", proc_cwd_link
),
3194 LNK("root", proc_root_link
),
3195 LNK("exe", proc_exe_link
),
3196 REG("mounts", S_IRUGO
, proc_mounts_operations
),
3197 REG("mountinfo", S_IRUGO
, proc_mountinfo_operations
),
3198 #ifdef CONFIG_PROC_PAGE_MONITOR
3199 REG("clear_refs", S_IWUSR
, proc_clear_refs_operations
),
3200 REG("smaps", S_IRUGO
, proc_tid_smaps_operations
),
3201 REG("pagemap", S_IRUSR
, proc_pagemap_operations
),
3203 #ifdef CONFIG_SECURITY
3204 DIR("attr", S_IRUGO
|S_IXUGO
, proc_attr_dir_inode_operations
, proc_attr_dir_operations
),
3206 #ifdef CONFIG_KALLSYMS
3207 ONE("wchan", S_IRUGO
, proc_pid_wchan
),
3209 #ifdef CONFIG_STACKTRACE
3210 ONE("stack", S_IRUSR
, proc_pid_stack
),
3212 #ifdef CONFIG_SCHED_INFO
3213 ONE("schedstat", S_IRUGO
, proc_pid_schedstat
),
3215 #ifdef CONFIG_LATENCYTOP
3216 REG("latency", S_IRUGO
, proc_lstats_operations
),
3218 #ifdef CONFIG_PROC_PID_CPUSET
3219 ONE("cpuset", S_IRUGO
, proc_cpuset_show
),
3221 #ifdef CONFIG_CGROUPS
3222 ONE("cgroup", S_IRUGO
, proc_cgroup_show
),
3224 ONE("oom_score", S_IRUGO
, proc_oom_score
),
3225 REG("oom_adj", S_IRUGO
|S_IWUSR
, proc_oom_adj_operations
),
3226 REG("oom_score_adj", S_IRUGO
|S_IWUSR
, proc_oom_score_adj_operations
),
3227 #ifdef CONFIG_AUDITSYSCALL
3228 REG("loginuid", S_IWUSR
|S_IRUGO
, proc_loginuid_operations
),
3229 REG("sessionid", S_IRUGO
, proc_sessionid_operations
),
3231 #ifdef CONFIG_FAULT_INJECTION
3232 REG("make-it-fail", S_IRUGO
|S_IWUSR
, proc_fault_inject_operations
),
3234 #ifdef CONFIG_TASK_IO_ACCOUNTING
3235 ONE("io", S_IRUSR
, proc_tid_io_accounting
),
3237 #ifdef CONFIG_HARDWALL
3238 ONE("hardwall", S_IRUGO
, proc_pid_hardwall
),
3240 #ifdef CONFIG_USER_NS
3241 REG("uid_map", S_IRUGO
|S_IWUSR
, proc_uid_map_operations
),
3242 REG("gid_map", S_IRUGO
|S_IWUSR
, proc_gid_map_operations
),
3243 REG("projid_map", S_IRUGO
|S_IWUSR
, proc_projid_map_operations
),
3244 REG("setgroups", S_IRUGO
|S_IWUSR
, proc_setgroups_operations
),
3248 static int proc_tid_base_readdir(struct file
*file
, struct dir_context
*ctx
)
3250 return proc_pident_readdir(file
, ctx
,
3251 tid_base_stuff
, ARRAY_SIZE(tid_base_stuff
));
3254 static struct dentry
*proc_tid_base_lookup(struct inode
*dir
, struct dentry
*dentry
, unsigned int flags
)
3256 return proc_pident_lookup(dir
, dentry
,
3257 tid_base_stuff
, ARRAY_SIZE(tid_base_stuff
));
3260 static const struct file_operations proc_tid_base_operations
= {
3261 .read
= generic_read_dir
,
3262 .iterate
= proc_tid_base_readdir
,
3263 .llseek
= default_llseek
,
3266 static const struct inode_operations proc_tid_base_inode_operations
= {
3267 .lookup
= proc_tid_base_lookup
,
3268 .getattr
= pid_getattr
,
3269 .setattr
= proc_setattr
,
3272 static int proc_task_instantiate(struct inode
*dir
,
3273 struct dentry
*dentry
, struct task_struct
*task
, const void *ptr
)
3275 struct inode
*inode
;
3276 inode
= proc_pid_make_inode(dir
->i_sb
, task
);
3280 inode
->i_mode
= S_IFDIR
|S_IRUGO
|S_IXUGO
;
3281 inode
->i_op
= &proc_tid_base_inode_operations
;
3282 inode
->i_fop
= &proc_tid_base_operations
;
3283 inode
->i_flags
|=S_IMMUTABLE
;
3285 set_nlink(inode
, 2 + pid_entry_count_dirs(tid_base_stuff
,
3286 ARRAY_SIZE(tid_base_stuff
)));
3288 d_set_d_op(dentry
, &pid_dentry_operations
);
3290 d_add(dentry
, inode
);
3291 /* Close the race of the process dying before we return the dentry */
3292 if (pid_revalidate(dentry
, 0))
3298 static struct dentry
*proc_task_lookup(struct inode
*dir
, struct dentry
* dentry
, unsigned int flags
)
3300 int result
= -ENOENT
;
3301 struct task_struct
*task
;
3302 struct task_struct
*leader
= get_proc_task(dir
);
3304 struct pid_namespace
*ns
;
3309 tid
= name_to_int(&dentry
->d_name
);
3313 ns
= dentry
->d_sb
->s_fs_info
;
3315 task
= find_task_by_pid_ns(tid
, ns
);
3317 get_task_struct(task
);
3321 if (!same_thread_group(leader
, task
))
3324 result
= proc_task_instantiate(dir
, dentry
, task
, NULL
);
3326 put_task_struct(task
);
3328 put_task_struct(leader
);
3330 return ERR_PTR(result
);
3334 * Find the first tid of a thread group to return to user space.
3336 * Usually this is just the thread group leader, but if the users
3337 * buffer was too small or there was a seek into the middle of the
3338 * directory we have more work todo.
3340 * In the case of a short read we start with find_task_by_pid.
3342 * In the case of a seek we start with the leader and walk nr
3345 static struct task_struct
*first_tid(struct pid
*pid
, int tid
, loff_t f_pos
,
3346 struct pid_namespace
*ns
)
3348 struct task_struct
*pos
, *task
;
3349 unsigned long nr
= f_pos
;
3351 if (nr
!= f_pos
) /* 32bit overflow? */
3355 task
= pid_task(pid
, PIDTYPE_PID
);
3359 /* Attempt to start with the tid of a thread */
3361 pos
= find_task_by_pid_ns(tid
, ns
);
3362 if (pos
&& same_thread_group(pos
, task
))
3366 /* If nr exceeds the number of threads there is nothing todo */
3367 if (nr
>= get_nr_threads(task
))
3370 /* If we haven't found our starting place yet start
3371 * with the leader and walk nr threads forward.
3373 pos
= task
= task
->group_leader
;
3377 } while_each_thread(task
, pos
);
3382 get_task_struct(pos
);
3389 * Find the next thread in the thread list.
3390 * Return NULL if there is an error or no next thread.
3392 * The reference to the input task_struct is released.
3394 static struct task_struct
*next_tid(struct task_struct
*start
)
3396 struct task_struct
*pos
= NULL
;
3398 if (pid_alive(start
)) {
3399 pos
= next_thread(start
);
3400 if (thread_group_leader(pos
))
3403 get_task_struct(pos
);
3406 put_task_struct(start
);
3410 /* for the /proc/TGID/task/ directories */
3411 static int proc_task_readdir(struct file
*file
, struct dir_context
*ctx
)
3413 struct inode
*inode
= file_inode(file
);
3414 struct task_struct
*task
;
3415 struct pid_namespace
*ns
;
3418 if (proc_inode_is_dead(inode
))
3421 if (!dir_emit_dots(file
, ctx
))
3424 /* f_version caches the tgid value that the last readdir call couldn't
3425 * return. lseek aka telldir automagically resets f_version to 0.
3427 ns
= inode
->i_sb
->s_fs_info
;
3428 tid
= (int)file
->f_version
;
3429 file
->f_version
= 0;
3430 for (task
= first_tid(proc_pid(inode
), tid
, ctx
->pos
- 2, ns
);
3432 task
= next_tid(task
), ctx
->pos
++) {
3433 char name
[PROC_NUMBUF
];
3435 tid
= task_pid_nr_ns(task
, ns
);
3436 len
= snprintf(name
, sizeof(name
), "%d", tid
);
3437 if (!proc_fill_cache(file
, ctx
, name
, len
,
3438 proc_task_instantiate
, task
, NULL
)) {
3439 /* returning this tgid failed, save it as the first
3440 * pid for the next readir call */
3441 file
->f_version
= (u64
)tid
;
3442 put_task_struct(task
);
3450 static int proc_task_getattr(struct vfsmount
*mnt
, struct dentry
*dentry
, struct kstat
*stat
)
3452 struct inode
*inode
= d_inode(dentry
);
3453 struct task_struct
*p
= get_proc_task(inode
);
3454 generic_fillattr(inode
, stat
);
3457 stat
->nlink
+= get_nr_threads(p
);
3464 static const struct inode_operations proc_task_inode_operations
= {
3465 .lookup
= proc_task_lookup
,
3466 .getattr
= proc_task_getattr
,
3467 .setattr
= proc_setattr
,
3468 .permission
= proc_pid_permission
,
3471 static const struct file_operations proc_task_operations
= {
3472 .read
= generic_read_dir
,
3473 .iterate
= proc_task_readdir
,
3474 .llseek
= default_llseek
,