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 points
= oom_badness(task
, NULL
, NULL
, totalpages
) *
584 seq_printf(m
, "%lu\n", points
);
594 static const struct limit_names lnames
[RLIM_NLIMITS
] = {
595 [RLIMIT_CPU
] = {"Max cpu time", "seconds"},
596 [RLIMIT_FSIZE
] = {"Max file size", "bytes"},
597 [RLIMIT_DATA
] = {"Max data size", "bytes"},
598 [RLIMIT_STACK
] = {"Max stack size", "bytes"},
599 [RLIMIT_CORE
] = {"Max core file size", "bytes"},
600 [RLIMIT_RSS
] = {"Max resident set", "bytes"},
601 [RLIMIT_NPROC
] = {"Max processes", "processes"},
602 [RLIMIT_NOFILE
] = {"Max open files", "files"},
603 [RLIMIT_MEMLOCK
] = {"Max locked memory", "bytes"},
604 [RLIMIT_AS
] = {"Max address space", "bytes"},
605 [RLIMIT_LOCKS
] = {"Max file locks", "locks"},
606 [RLIMIT_SIGPENDING
] = {"Max pending signals", "signals"},
607 [RLIMIT_MSGQUEUE
] = {"Max msgqueue size", "bytes"},
608 [RLIMIT_NICE
] = {"Max nice priority", NULL
},
609 [RLIMIT_RTPRIO
] = {"Max realtime priority", NULL
},
610 [RLIMIT_RTTIME
] = {"Max realtime timeout", "us"},
613 /* Display limits for a process */
614 static int proc_pid_limits(struct seq_file
*m
, struct pid_namespace
*ns
,
615 struct pid
*pid
, struct task_struct
*task
)
620 struct rlimit rlim
[RLIM_NLIMITS
];
622 if (!lock_task_sighand(task
, &flags
))
624 memcpy(rlim
, task
->signal
->rlim
, sizeof(struct rlimit
) * RLIM_NLIMITS
);
625 unlock_task_sighand(task
, &flags
);
628 * print the file header
630 seq_printf(m
, "%-25s %-20s %-20s %-10s\n",
631 "Limit", "Soft Limit", "Hard Limit", "Units");
633 for (i
= 0; i
< RLIM_NLIMITS
; i
++) {
634 if (rlim
[i
].rlim_cur
== RLIM_INFINITY
)
635 seq_printf(m
, "%-25s %-20s ",
636 lnames
[i
].name
, "unlimited");
638 seq_printf(m
, "%-25s %-20lu ",
639 lnames
[i
].name
, rlim
[i
].rlim_cur
);
641 if (rlim
[i
].rlim_max
== RLIM_INFINITY
)
642 seq_printf(m
, "%-20s ", "unlimited");
644 seq_printf(m
, "%-20lu ", rlim
[i
].rlim_max
);
647 seq_printf(m
, "%-10s\n", lnames
[i
].unit
);
655 #ifdef CONFIG_HAVE_ARCH_TRACEHOOK
656 static int proc_pid_syscall(struct seq_file
*m
, struct pid_namespace
*ns
,
657 struct pid
*pid
, struct task_struct
*task
)
660 unsigned long args
[6], sp
, pc
;
663 res
= lock_trace(task
);
667 if (task_current_syscall(task
, &nr
, args
, 6, &sp
, &pc
))
668 seq_puts(m
, "running\n");
670 seq_printf(m
, "%ld 0x%lx 0x%lx\n", nr
, sp
, pc
);
673 "%ld 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx\n",
675 args
[0], args
[1], args
[2], args
[3], args
[4], args
[5],
681 #endif /* CONFIG_HAVE_ARCH_TRACEHOOK */
683 /************************************************************************/
684 /* Here the fs part begins */
685 /************************************************************************/
687 /* permission checks */
688 static int proc_fd_access_allowed(struct inode
*inode
)
690 struct task_struct
*task
;
692 /* Allow access to a task's file descriptors if it is us or we
693 * may use ptrace attach to the process and find out that
696 task
= get_proc_task(inode
);
698 allowed
= ptrace_may_access(task
, PTRACE_MODE_READ_FSCREDS
);
699 put_task_struct(task
);
704 int proc_setattr(struct dentry
*dentry
, struct iattr
*attr
)
707 struct inode
*inode
= d_inode(dentry
);
709 if (attr
->ia_valid
& ATTR_MODE
)
712 error
= inode_change_ok(inode
, attr
);
716 setattr_copy(inode
, attr
);
717 mark_inode_dirty(inode
);
722 * May current process learn task's sched/cmdline info (for hide_pid_min=1)
723 * or euid/egid (for hide_pid_min=2)?
725 static bool has_pid_permissions(struct pid_namespace
*pid
,
726 struct task_struct
*task
,
729 if (pid
->hide_pid
< hide_pid_min
)
731 if (in_group_p(pid
->pid_gid
))
733 return ptrace_may_access(task
, PTRACE_MODE_READ_FSCREDS
);
737 static int proc_pid_permission(struct inode
*inode
, int mask
)
739 struct pid_namespace
*pid
= inode
->i_sb
->s_fs_info
;
740 struct task_struct
*task
;
743 task
= get_proc_task(inode
);
746 has_perms
= has_pid_permissions(pid
, task
, 1);
747 put_task_struct(task
);
750 if (pid
->hide_pid
== 2) {
752 * Let's make getdents(), stat(), and open()
753 * consistent with each other. If a process
754 * may not stat() a file, it shouldn't be seen
762 return generic_permission(inode
, mask
);
767 static const struct inode_operations proc_def_inode_operations
= {
768 .setattr
= proc_setattr
,
771 static int proc_single_show(struct seq_file
*m
, void *v
)
773 struct inode
*inode
= m
->private;
774 struct pid_namespace
*ns
;
776 struct task_struct
*task
;
779 ns
= inode
->i_sb
->s_fs_info
;
780 pid
= proc_pid(inode
);
781 task
= get_pid_task(pid
, PIDTYPE_PID
);
785 ret
= PROC_I(inode
)->op
.proc_show(m
, ns
, pid
, task
);
787 put_task_struct(task
);
791 static int proc_single_open(struct inode
*inode
, struct file
*filp
)
793 return single_open(filp
, proc_single_show
, inode
);
796 static const struct file_operations proc_single_file_operations
= {
797 .open
= proc_single_open
,
800 .release
= single_release
,
804 struct mm_struct
*proc_mem_open(struct inode
*inode
, unsigned int mode
)
806 struct task_struct
*task
= get_proc_task(inode
);
807 struct mm_struct
*mm
= ERR_PTR(-ESRCH
);
810 mm
= mm_access(task
, mode
| PTRACE_MODE_FSCREDS
);
811 put_task_struct(task
);
813 if (!IS_ERR_OR_NULL(mm
)) {
814 /* ensure this mm_struct can't be freed */
815 atomic_inc(&mm
->mm_count
);
816 /* but do not pin its memory */
824 static int __mem_open(struct inode
*inode
, struct file
*file
, unsigned int mode
)
826 struct mm_struct
*mm
= proc_mem_open(inode
, mode
);
831 file
->private_data
= mm
;
835 static int mem_open(struct inode
*inode
, struct file
*file
)
837 int ret
= __mem_open(inode
, file
, PTRACE_MODE_ATTACH
);
839 /* OK to pass negative loff_t, we can catch out-of-range */
840 file
->f_mode
|= FMODE_UNSIGNED_OFFSET
;
845 static ssize_t
mem_rw(struct file
*file
, char __user
*buf
,
846 size_t count
, loff_t
*ppos
, int write
)
848 struct mm_struct
*mm
= file
->private_data
;
849 unsigned long addr
= *ppos
;
856 page
= (char *)__get_free_page(GFP_TEMPORARY
);
861 if (!atomic_inc_not_zero(&mm
->mm_users
))
865 int this_len
= min_t(int, count
, PAGE_SIZE
);
867 if (write
&& copy_from_user(page
, buf
, this_len
)) {
872 this_len
= access_remote_vm(mm
, addr
, page
, this_len
, write
);
879 if (!write
&& copy_to_user(buf
, page
, this_len
)) {
893 free_page((unsigned long) page
);
897 static ssize_t
mem_read(struct file
*file
, char __user
*buf
,
898 size_t count
, loff_t
*ppos
)
900 return mem_rw(file
, buf
, count
, ppos
, 0);
903 static ssize_t
mem_write(struct file
*file
, const char __user
*buf
,
904 size_t count
, loff_t
*ppos
)
906 return mem_rw(file
, (char __user
*)buf
, count
, ppos
, 1);
909 loff_t
mem_lseek(struct file
*file
, loff_t offset
, int orig
)
913 file
->f_pos
= offset
;
916 file
->f_pos
+= offset
;
921 force_successful_syscall_return();
925 static int mem_release(struct inode
*inode
, struct file
*file
)
927 struct mm_struct
*mm
= file
->private_data
;
933 static const struct file_operations proc_mem_operations
= {
938 .release
= mem_release
,
941 static int environ_open(struct inode
*inode
, struct file
*file
)
943 return __mem_open(inode
, file
, PTRACE_MODE_READ
);
946 static ssize_t
environ_read(struct file
*file
, char __user
*buf
,
947 size_t count
, loff_t
*ppos
)
950 unsigned long src
= *ppos
;
952 struct mm_struct
*mm
= file
->private_data
;
953 unsigned long env_start
, env_end
;
955 /* Ensure the process spawned far enough to have an environment. */
956 if (!mm
|| !mm
->env_end
)
959 page
= (char *)__get_free_page(GFP_TEMPORARY
);
964 if (!atomic_inc_not_zero(&mm
->mm_users
))
967 down_read(&mm
->mmap_sem
);
968 env_start
= mm
->env_start
;
969 env_end
= mm
->env_end
;
970 up_read(&mm
->mmap_sem
);
973 size_t this_len
, max_len
;
976 if (src
>= (env_end
- env_start
))
979 this_len
= env_end
- (env_start
+ src
);
981 max_len
= min_t(size_t, PAGE_SIZE
, count
);
982 this_len
= min(max_len
, this_len
);
984 retval
= access_remote_vm(mm
, (env_start
+ src
),
992 if (copy_to_user(buf
, page
, retval
)) {
1006 free_page((unsigned long) page
);
1010 static const struct file_operations proc_environ_operations
= {
1011 .open
= environ_open
,
1012 .read
= environ_read
,
1013 .llseek
= generic_file_llseek
,
1014 .release
= mem_release
,
1017 static ssize_t
oom_adj_read(struct file
*file
, char __user
*buf
, size_t count
,
1020 struct task_struct
*task
= get_proc_task(file_inode(file
));
1021 char buffer
[PROC_NUMBUF
];
1022 int oom_adj
= OOM_ADJUST_MIN
;
1027 if (task
->signal
->oom_score_adj
== OOM_SCORE_ADJ_MAX
)
1028 oom_adj
= OOM_ADJUST_MAX
;
1030 oom_adj
= (task
->signal
->oom_score_adj
* -OOM_DISABLE
) /
1032 put_task_struct(task
);
1033 len
= snprintf(buffer
, sizeof(buffer
), "%d\n", oom_adj
);
1034 return simple_read_from_buffer(buf
, count
, ppos
, buffer
, len
);
1037 static int __set_oom_adj(struct file
*file
, int oom_adj
, bool legacy
)
1039 static DEFINE_MUTEX(oom_adj_mutex
);
1040 struct mm_struct
*mm
= NULL
;
1041 struct task_struct
*task
;
1044 task
= get_proc_task(file_inode(file
));
1048 mutex_lock(&oom_adj_mutex
);
1050 if (oom_adj
< task
->signal
->oom_score_adj
&&
1051 !capable(CAP_SYS_RESOURCE
)) {
1056 * /proc/pid/oom_adj is provided for legacy purposes, ask users to use
1057 * /proc/pid/oom_score_adj instead.
1059 pr_warn_once("%s (%d): /proc/%d/oom_adj is deprecated, please use /proc/%d/oom_score_adj instead.\n",
1060 current
->comm
, task_pid_nr(current
), task_pid_nr(task
),
1063 if ((short)oom_adj
< task
->signal
->oom_score_adj_min
&&
1064 !capable(CAP_SYS_RESOURCE
)) {
1071 * Make sure we will check other processes sharing the mm if this is
1072 * not vfrok which wants its own oom_score_adj.
1073 * pin the mm so it doesn't go away and get reused after task_unlock
1075 if (!task
->vfork_done
) {
1076 struct task_struct
*p
= find_lock_task_mm(task
);
1079 if (atomic_read(&p
->mm
->mm_users
) > 1) {
1081 atomic_inc(&mm
->mm_count
);
1087 task
->signal
->oom_score_adj
= oom_adj
;
1088 if (!legacy
&& has_capability_noaudit(current
, CAP_SYS_RESOURCE
))
1089 task
->signal
->oom_score_adj_min
= (short)oom_adj
;
1090 trace_oom_score_adj_update(task
);
1093 struct task_struct
*p
;
1096 for_each_process(p
) {
1097 if (same_thread_group(task
, p
))
1100 /* do not touch kernel threads or the global init */
1101 if (p
->flags
& PF_KTHREAD
|| is_global_init(p
))
1105 if (!p
->vfork_done
&& process_shares_mm(p
, mm
)) {
1106 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",
1107 task_pid_nr(p
), p
->comm
,
1108 p
->signal
->oom_score_adj
, oom_adj
,
1109 task_pid_nr(task
), task
->comm
);
1110 p
->signal
->oom_score_adj
= oom_adj
;
1111 if (!legacy
&& has_capability_noaudit(current
, CAP_SYS_RESOURCE
))
1112 p
->signal
->oom_score_adj_min
= (short)oom_adj
;
1120 mutex_unlock(&oom_adj_mutex
);
1121 put_task_struct(task
);
1126 * /proc/pid/oom_adj exists solely for backwards compatibility with previous
1127 * kernels. The effective policy is defined by oom_score_adj, which has a
1128 * different scale: oom_adj grew exponentially and oom_score_adj grows linearly.
1129 * Values written to oom_adj are simply mapped linearly to oom_score_adj.
1130 * Processes that become oom disabled via oom_adj will still be oom disabled
1131 * with this implementation.
1133 * oom_adj cannot be removed since existing userspace binaries use it.
1135 static ssize_t
oom_adj_write(struct file
*file
, const char __user
*buf
,
1136 size_t count
, loff_t
*ppos
)
1138 char buffer
[PROC_NUMBUF
];
1142 memset(buffer
, 0, sizeof(buffer
));
1143 if (count
> sizeof(buffer
) - 1)
1144 count
= sizeof(buffer
) - 1;
1145 if (copy_from_user(buffer
, buf
, count
)) {
1150 err
= kstrtoint(strstrip(buffer
), 0, &oom_adj
);
1153 if ((oom_adj
< OOM_ADJUST_MIN
|| oom_adj
> OOM_ADJUST_MAX
) &&
1154 oom_adj
!= OOM_DISABLE
) {
1160 * Scale /proc/pid/oom_score_adj appropriately ensuring that a maximum
1161 * value is always attainable.
1163 if (oom_adj
== OOM_ADJUST_MAX
)
1164 oom_adj
= OOM_SCORE_ADJ_MAX
;
1166 oom_adj
= (oom_adj
* OOM_SCORE_ADJ_MAX
) / -OOM_DISABLE
;
1168 err
= __set_oom_adj(file
, oom_adj
, true);
1170 return err
< 0 ? err
: count
;
1173 static const struct file_operations proc_oom_adj_operations
= {
1174 .read
= oom_adj_read
,
1175 .write
= oom_adj_write
,
1176 .llseek
= generic_file_llseek
,
1179 static ssize_t
oom_score_adj_read(struct file
*file
, char __user
*buf
,
1180 size_t count
, loff_t
*ppos
)
1182 struct task_struct
*task
= get_proc_task(file_inode(file
));
1183 char buffer
[PROC_NUMBUF
];
1184 short oom_score_adj
= OOM_SCORE_ADJ_MIN
;
1189 oom_score_adj
= task
->signal
->oom_score_adj
;
1190 put_task_struct(task
);
1191 len
= snprintf(buffer
, sizeof(buffer
), "%hd\n", oom_score_adj
);
1192 return simple_read_from_buffer(buf
, count
, ppos
, buffer
, len
);
1195 static ssize_t
oom_score_adj_write(struct file
*file
, const char __user
*buf
,
1196 size_t count
, loff_t
*ppos
)
1198 char buffer
[PROC_NUMBUF
];
1202 memset(buffer
, 0, sizeof(buffer
));
1203 if (count
> sizeof(buffer
) - 1)
1204 count
= sizeof(buffer
) - 1;
1205 if (copy_from_user(buffer
, buf
, count
)) {
1210 err
= kstrtoint(strstrip(buffer
), 0, &oom_score_adj
);
1213 if (oom_score_adj
< OOM_SCORE_ADJ_MIN
||
1214 oom_score_adj
> OOM_SCORE_ADJ_MAX
) {
1219 err
= __set_oom_adj(file
, oom_score_adj
, false);
1221 return err
< 0 ? err
: count
;
1224 static const struct file_operations proc_oom_score_adj_operations
= {
1225 .read
= oom_score_adj_read
,
1226 .write
= oom_score_adj_write
,
1227 .llseek
= default_llseek
,
1230 #ifdef CONFIG_AUDITSYSCALL
1231 #define TMPBUFLEN 21
1232 static ssize_t
proc_loginuid_read(struct file
* file
, char __user
* buf
,
1233 size_t count
, loff_t
*ppos
)
1235 struct inode
* inode
= file_inode(file
);
1236 struct task_struct
*task
= get_proc_task(inode
);
1238 char tmpbuf
[TMPBUFLEN
];
1242 length
= scnprintf(tmpbuf
, TMPBUFLEN
, "%u",
1243 from_kuid(file
->f_cred
->user_ns
,
1244 audit_get_loginuid(task
)));
1245 put_task_struct(task
);
1246 return simple_read_from_buffer(buf
, count
, ppos
, tmpbuf
, length
);
1249 static ssize_t
proc_loginuid_write(struct file
* file
, const char __user
* buf
,
1250 size_t count
, loff_t
*ppos
)
1252 struct inode
* inode
= file_inode(file
);
1258 if (current
!= pid_task(proc_pid(inode
), PIDTYPE_PID
)) {
1265 /* No partial writes. */
1269 rv
= kstrtou32_from_user(buf
, count
, 10, &loginuid
);
1273 /* is userspace tring to explicitly UNSET the loginuid? */
1274 if (loginuid
== AUDIT_UID_UNSET
) {
1275 kloginuid
= INVALID_UID
;
1277 kloginuid
= make_kuid(file
->f_cred
->user_ns
, loginuid
);
1278 if (!uid_valid(kloginuid
))
1282 rv
= audit_set_loginuid(kloginuid
);
1288 static const struct file_operations proc_loginuid_operations
= {
1289 .read
= proc_loginuid_read
,
1290 .write
= proc_loginuid_write
,
1291 .llseek
= generic_file_llseek
,
1294 static ssize_t
proc_sessionid_read(struct file
* file
, char __user
* buf
,
1295 size_t count
, loff_t
*ppos
)
1297 struct inode
* inode
= file_inode(file
);
1298 struct task_struct
*task
= get_proc_task(inode
);
1300 char tmpbuf
[TMPBUFLEN
];
1304 length
= scnprintf(tmpbuf
, TMPBUFLEN
, "%u",
1305 audit_get_sessionid(task
));
1306 put_task_struct(task
);
1307 return simple_read_from_buffer(buf
, count
, ppos
, tmpbuf
, length
);
1310 static const struct file_operations proc_sessionid_operations
= {
1311 .read
= proc_sessionid_read
,
1312 .llseek
= generic_file_llseek
,
1316 #ifdef CONFIG_FAULT_INJECTION
1317 static ssize_t
proc_fault_inject_read(struct file
* file
, char __user
* buf
,
1318 size_t count
, loff_t
*ppos
)
1320 struct task_struct
*task
= get_proc_task(file_inode(file
));
1321 char buffer
[PROC_NUMBUF
];
1327 make_it_fail
= task
->make_it_fail
;
1328 put_task_struct(task
);
1330 len
= snprintf(buffer
, sizeof(buffer
), "%i\n", make_it_fail
);
1332 return simple_read_from_buffer(buf
, count
, ppos
, buffer
, len
);
1335 static ssize_t
proc_fault_inject_write(struct file
* file
,
1336 const char __user
* buf
, size_t count
, loff_t
*ppos
)
1338 struct task_struct
*task
;
1339 char buffer
[PROC_NUMBUF
];
1343 if (!capable(CAP_SYS_RESOURCE
))
1345 memset(buffer
, 0, sizeof(buffer
));
1346 if (count
> sizeof(buffer
) - 1)
1347 count
= sizeof(buffer
) - 1;
1348 if (copy_from_user(buffer
, buf
, count
))
1350 rv
= kstrtoint(strstrip(buffer
), 0, &make_it_fail
);
1353 if (make_it_fail
< 0 || make_it_fail
> 1)
1356 task
= get_proc_task(file_inode(file
));
1359 task
->make_it_fail
= make_it_fail
;
1360 put_task_struct(task
);
1365 static const struct file_operations proc_fault_inject_operations
= {
1366 .read
= proc_fault_inject_read
,
1367 .write
= proc_fault_inject_write
,
1368 .llseek
= generic_file_llseek
,
1373 #ifdef CONFIG_SCHED_DEBUG
1375 * Print out various scheduling related per-task fields:
1377 static int sched_show(struct seq_file
*m
, void *v
)
1379 struct inode
*inode
= m
->private;
1380 struct task_struct
*p
;
1382 p
= get_proc_task(inode
);
1385 proc_sched_show_task(p
, m
);
1393 sched_write(struct file
*file
, const char __user
*buf
,
1394 size_t count
, loff_t
*offset
)
1396 struct inode
*inode
= file_inode(file
);
1397 struct task_struct
*p
;
1399 p
= get_proc_task(inode
);
1402 proc_sched_set_task(p
);
1409 static int sched_open(struct inode
*inode
, struct file
*filp
)
1411 return single_open(filp
, sched_show
, inode
);
1414 static const struct file_operations proc_pid_sched_operations
= {
1417 .write
= sched_write
,
1418 .llseek
= seq_lseek
,
1419 .release
= single_release
,
1424 #ifdef CONFIG_SCHED_AUTOGROUP
1426 * Print out autogroup related information:
1428 static int sched_autogroup_show(struct seq_file
*m
, void *v
)
1430 struct inode
*inode
= m
->private;
1431 struct task_struct
*p
;
1433 p
= get_proc_task(inode
);
1436 proc_sched_autogroup_show_task(p
, m
);
1444 sched_autogroup_write(struct file
*file
, const char __user
*buf
,
1445 size_t count
, loff_t
*offset
)
1447 struct inode
*inode
= file_inode(file
);
1448 struct task_struct
*p
;
1449 char buffer
[PROC_NUMBUF
];
1453 memset(buffer
, 0, sizeof(buffer
));
1454 if (count
> sizeof(buffer
) - 1)
1455 count
= sizeof(buffer
) - 1;
1456 if (copy_from_user(buffer
, buf
, count
))
1459 err
= kstrtoint(strstrip(buffer
), 0, &nice
);
1463 p
= get_proc_task(inode
);
1467 err
= proc_sched_autogroup_set_nice(p
, nice
);
1476 static int sched_autogroup_open(struct inode
*inode
, struct file
*filp
)
1480 ret
= single_open(filp
, sched_autogroup_show
, NULL
);
1482 struct seq_file
*m
= filp
->private_data
;
1489 static const struct file_operations proc_pid_sched_autogroup_operations
= {
1490 .open
= sched_autogroup_open
,
1492 .write
= sched_autogroup_write
,
1493 .llseek
= seq_lseek
,
1494 .release
= single_release
,
1497 #endif /* CONFIG_SCHED_AUTOGROUP */
1499 static ssize_t
comm_write(struct file
*file
, const char __user
*buf
,
1500 size_t count
, loff_t
*offset
)
1502 struct inode
*inode
= file_inode(file
);
1503 struct task_struct
*p
;
1504 char buffer
[TASK_COMM_LEN
];
1505 const size_t maxlen
= sizeof(buffer
) - 1;
1507 memset(buffer
, 0, sizeof(buffer
));
1508 if (copy_from_user(buffer
, buf
, count
> maxlen
? maxlen
: count
))
1511 p
= get_proc_task(inode
);
1515 if (same_thread_group(current
, p
))
1516 set_task_comm(p
, buffer
);
1525 static int comm_show(struct seq_file
*m
, void *v
)
1527 struct inode
*inode
= m
->private;
1528 struct task_struct
*p
;
1530 p
= get_proc_task(inode
);
1535 seq_printf(m
, "%s\n", p
->comm
);
1543 static int comm_open(struct inode
*inode
, struct file
*filp
)
1545 return single_open(filp
, comm_show
, inode
);
1548 static const struct file_operations proc_pid_set_comm_operations
= {
1551 .write
= comm_write
,
1552 .llseek
= seq_lseek
,
1553 .release
= single_release
,
1556 static int proc_exe_link(struct dentry
*dentry
, struct path
*exe_path
)
1558 struct task_struct
*task
;
1559 struct file
*exe_file
;
1561 task
= get_proc_task(d_inode(dentry
));
1564 exe_file
= get_task_exe_file(task
);
1565 put_task_struct(task
);
1567 *exe_path
= exe_file
->f_path
;
1568 path_get(&exe_file
->f_path
);
1575 static const char *proc_pid_get_link(struct dentry
*dentry
,
1576 struct inode
*inode
,
1577 struct delayed_call
*done
)
1580 int error
= -EACCES
;
1583 return ERR_PTR(-ECHILD
);
1585 /* Are we allowed to snoop on the tasks file descriptors? */
1586 if (!proc_fd_access_allowed(inode
))
1589 error
= PROC_I(inode
)->op
.proc_get_link(dentry
, &path
);
1593 nd_jump_link(&path
);
1596 return ERR_PTR(error
);
1599 static int do_proc_readlink(struct path
*path
, char __user
*buffer
, int buflen
)
1601 char *tmp
= (char*)__get_free_page(GFP_TEMPORARY
);
1608 pathname
= d_path(path
, tmp
, PAGE_SIZE
);
1609 len
= PTR_ERR(pathname
);
1610 if (IS_ERR(pathname
))
1612 len
= tmp
+ PAGE_SIZE
- 1 - pathname
;
1616 if (copy_to_user(buffer
, pathname
, len
))
1619 free_page((unsigned long)tmp
);
1623 static int proc_pid_readlink(struct dentry
* dentry
, char __user
* buffer
, int buflen
)
1625 int error
= -EACCES
;
1626 struct inode
*inode
= d_inode(dentry
);
1629 /* Are we allowed to snoop on the tasks file descriptors? */
1630 if (!proc_fd_access_allowed(inode
))
1633 error
= PROC_I(inode
)->op
.proc_get_link(dentry
, &path
);
1637 error
= do_proc_readlink(&path
, buffer
, buflen
);
1643 const struct inode_operations proc_pid_link_inode_operations
= {
1644 .readlink
= proc_pid_readlink
,
1645 .get_link
= proc_pid_get_link
,
1646 .setattr
= proc_setattr
,
1650 /* building an inode */
1652 struct inode
*proc_pid_make_inode(struct super_block
* sb
, struct task_struct
*task
)
1654 struct inode
* inode
;
1655 struct proc_inode
*ei
;
1656 const struct cred
*cred
;
1658 /* We need a new inode */
1660 inode
= new_inode(sb
);
1666 inode
->i_ino
= get_next_ino();
1667 inode
->i_mtime
= inode
->i_atime
= inode
->i_ctime
= CURRENT_TIME
;
1668 inode
->i_op
= &proc_def_inode_operations
;
1671 * grab the reference to task.
1673 ei
->pid
= get_task_pid(task
, PIDTYPE_PID
);
1677 if (task_dumpable(task
)) {
1679 cred
= __task_cred(task
);
1680 inode
->i_uid
= cred
->euid
;
1681 inode
->i_gid
= cred
->egid
;
1684 security_task_to_inode(task
, inode
);
1694 int pid_getattr(struct vfsmount
*mnt
, struct dentry
*dentry
, struct kstat
*stat
)
1696 struct inode
*inode
= d_inode(dentry
);
1697 struct task_struct
*task
;
1698 const struct cred
*cred
;
1699 struct pid_namespace
*pid
= dentry
->d_sb
->s_fs_info
;
1701 generic_fillattr(inode
, stat
);
1704 stat
->uid
= GLOBAL_ROOT_UID
;
1705 stat
->gid
= GLOBAL_ROOT_GID
;
1706 task
= pid_task(proc_pid(inode
), PIDTYPE_PID
);
1708 if (!has_pid_permissions(pid
, task
, 2)) {
1711 * This doesn't prevent learning whether PID exists,
1712 * it only makes getattr() consistent with readdir().
1716 if ((inode
->i_mode
== (S_IFDIR
|S_IRUGO
|S_IXUGO
)) ||
1717 task_dumpable(task
)) {
1718 cred
= __task_cred(task
);
1719 stat
->uid
= cred
->euid
;
1720 stat
->gid
= cred
->egid
;
1730 * Exceptional case: normally we are not allowed to unhash a busy
1731 * directory. In this case, however, we can do it - no aliasing problems
1732 * due to the way we treat inodes.
1734 * Rewrite the inode's ownerships here because the owning task may have
1735 * performed a setuid(), etc.
1737 * Before the /proc/pid/status file was created the only way to read
1738 * the effective uid of a /process was to stat /proc/pid. Reading
1739 * /proc/pid/status is slow enough that procps and other packages
1740 * kept stating /proc/pid. To keep the rules in /proc simple I have
1741 * made this apply to all per process world readable and executable
1744 int pid_revalidate(struct dentry
*dentry
, unsigned int flags
)
1746 struct inode
*inode
;
1747 struct task_struct
*task
;
1748 const struct cred
*cred
;
1750 if (flags
& LOOKUP_RCU
)
1753 inode
= d_inode(dentry
);
1754 task
= get_proc_task(inode
);
1757 if ((inode
->i_mode
== (S_IFDIR
|S_IRUGO
|S_IXUGO
)) ||
1758 task_dumpable(task
)) {
1760 cred
= __task_cred(task
);
1761 inode
->i_uid
= cred
->euid
;
1762 inode
->i_gid
= cred
->egid
;
1765 inode
->i_uid
= GLOBAL_ROOT_UID
;
1766 inode
->i_gid
= GLOBAL_ROOT_GID
;
1768 inode
->i_mode
&= ~(S_ISUID
| S_ISGID
);
1769 security_task_to_inode(task
, inode
);
1770 put_task_struct(task
);
1776 static inline bool proc_inode_is_dead(struct inode
*inode
)
1778 return !proc_pid(inode
)->tasks
[PIDTYPE_PID
].first
;
1781 int pid_delete_dentry(const struct dentry
*dentry
)
1783 /* Is the task we represent dead?
1784 * If so, then don't put the dentry on the lru list,
1785 * kill it immediately.
1787 return proc_inode_is_dead(d_inode(dentry
));
1790 const struct dentry_operations pid_dentry_operations
=
1792 .d_revalidate
= pid_revalidate
,
1793 .d_delete
= pid_delete_dentry
,
1799 * Fill a directory entry.
1801 * If possible create the dcache entry and derive our inode number and
1802 * file type from dcache entry.
1804 * Since all of the proc inode numbers are dynamically generated, the inode
1805 * numbers do not exist until the inode is cache. This means creating the
1806 * the dcache entry in readdir is necessary to keep the inode numbers
1807 * reported by readdir in sync with the inode numbers reported
1810 bool proc_fill_cache(struct file
*file
, struct dir_context
*ctx
,
1811 const char *name
, int len
,
1812 instantiate_t instantiate
, struct task_struct
*task
, const void *ptr
)
1814 struct dentry
*child
, *dir
= file
->f_path
.dentry
;
1815 struct qstr qname
= QSTR_INIT(name
, len
);
1816 struct inode
*inode
;
1820 child
= d_hash_and_lookup(dir
, &qname
);
1822 DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq
);
1823 child
= d_alloc_parallel(dir
, &qname
, &wq
);
1825 goto end_instantiate
;
1826 if (d_in_lookup(child
)) {
1827 int err
= instantiate(d_inode(dir
), child
, task
, ptr
);
1828 d_lookup_done(child
);
1831 goto end_instantiate
;
1835 inode
= d_inode(child
);
1837 type
= inode
->i_mode
>> 12;
1839 return dir_emit(ctx
, name
, len
, ino
, type
);
1842 return dir_emit(ctx
, name
, len
, 1, DT_UNKNOWN
);
1846 * dname_to_vma_addr - maps a dentry name into two unsigned longs
1847 * which represent vma start and end addresses.
1849 static int dname_to_vma_addr(struct dentry
*dentry
,
1850 unsigned long *start
, unsigned long *end
)
1852 if (sscanf(dentry
->d_name
.name
, "%lx-%lx", start
, end
) != 2)
1858 static int map_files_d_revalidate(struct dentry
*dentry
, unsigned int flags
)
1860 unsigned long vm_start
, vm_end
;
1861 bool exact_vma_exists
= false;
1862 struct mm_struct
*mm
= NULL
;
1863 struct task_struct
*task
;
1864 const struct cred
*cred
;
1865 struct inode
*inode
;
1868 if (flags
& LOOKUP_RCU
)
1871 inode
= d_inode(dentry
);
1872 task
= get_proc_task(inode
);
1876 mm
= mm_access(task
, PTRACE_MODE_READ_FSCREDS
);
1877 if (IS_ERR_OR_NULL(mm
))
1880 if (!dname_to_vma_addr(dentry
, &vm_start
, &vm_end
)) {
1881 down_read(&mm
->mmap_sem
);
1882 exact_vma_exists
= !!find_exact_vma(mm
, vm_start
, vm_end
);
1883 up_read(&mm
->mmap_sem
);
1888 if (exact_vma_exists
) {
1889 if (task_dumpable(task
)) {
1891 cred
= __task_cred(task
);
1892 inode
->i_uid
= cred
->euid
;
1893 inode
->i_gid
= cred
->egid
;
1896 inode
->i_uid
= GLOBAL_ROOT_UID
;
1897 inode
->i_gid
= GLOBAL_ROOT_GID
;
1899 security_task_to_inode(task
, inode
);
1904 put_task_struct(task
);
1910 static const struct dentry_operations tid_map_files_dentry_operations
= {
1911 .d_revalidate
= map_files_d_revalidate
,
1912 .d_delete
= pid_delete_dentry
,
1915 static int map_files_get_link(struct dentry
*dentry
, struct path
*path
)
1917 unsigned long vm_start
, vm_end
;
1918 struct vm_area_struct
*vma
;
1919 struct task_struct
*task
;
1920 struct mm_struct
*mm
;
1924 task
= get_proc_task(d_inode(dentry
));
1928 mm
= get_task_mm(task
);
1929 put_task_struct(task
);
1933 rc
= dname_to_vma_addr(dentry
, &vm_start
, &vm_end
);
1938 down_read(&mm
->mmap_sem
);
1939 vma
= find_exact_vma(mm
, vm_start
, vm_end
);
1940 if (vma
&& vma
->vm_file
) {
1941 *path
= vma
->vm_file
->f_path
;
1945 up_read(&mm
->mmap_sem
);
1953 struct map_files_info
{
1956 unsigned char name
[4*sizeof(long)+2]; /* max: %lx-%lx\0 */
1960 * Only allow CAP_SYS_ADMIN to follow the links, due to concerns about how the
1961 * symlinks may be used to bypass permissions on ancestor directories in the
1962 * path to the file in question.
1965 proc_map_files_get_link(struct dentry
*dentry
,
1966 struct inode
*inode
,
1967 struct delayed_call
*done
)
1969 if (!capable(CAP_SYS_ADMIN
))
1970 return ERR_PTR(-EPERM
);
1972 return proc_pid_get_link(dentry
, inode
, done
);
1976 * Identical to proc_pid_link_inode_operations except for get_link()
1978 static const struct inode_operations proc_map_files_link_inode_operations
= {
1979 .readlink
= proc_pid_readlink
,
1980 .get_link
= proc_map_files_get_link
,
1981 .setattr
= proc_setattr
,
1985 proc_map_files_instantiate(struct inode
*dir
, struct dentry
*dentry
,
1986 struct task_struct
*task
, const void *ptr
)
1988 fmode_t mode
= (fmode_t
)(unsigned long)ptr
;
1989 struct proc_inode
*ei
;
1990 struct inode
*inode
;
1992 inode
= proc_pid_make_inode(dir
->i_sb
, task
);
1997 ei
->op
.proc_get_link
= map_files_get_link
;
1999 inode
->i_op
= &proc_map_files_link_inode_operations
;
2001 inode
->i_mode
= S_IFLNK
;
2003 if (mode
& FMODE_READ
)
2004 inode
->i_mode
|= S_IRUSR
;
2005 if (mode
& FMODE_WRITE
)
2006 inode
->i_mode
|= S_IWUSR
;
2008 d_set_d_op(dentry
, &tid_map_files_dentry_operations
);
2009 d_add(dentry
, inode
);
2014 static struct dentry
*proc_map_files_lookup(struct inode
*dir
,
2015 struct dentry
*dentry
, unsigned int flags
)
2017 unsigned long vm_start
, vm_end
;
2018 struct vm_area_struct
*vma
;
2019 struct task_struct
*task
;
2021 struct mm_struct
*mm
;
2024 task
= get_proc_task(dir
);
2029 if (!ptrace_may_access(task
, PTRACE_MODE_READ_FSCREDS
))
2033 if (dname_to_vma_addr(dentry
, &vm_start
, &vm_end
))
2036 mm
= get_task_mm(task
);
2040 down_read(&mm
->mmap_sem
);
2041 vma
= find_exact_vma(mm
, vm_start
, vm_end
);
2046 result
= proc_map_files_instantiate(dir
, dentry
, task
,
2047 (void *)(unsigned long)vma
->vm_file
->f_mode
);
2050 up_read(&mm
->mmap_sem
);
2053 put_task_struct(task
);
2055 return ERR_PTR(result
);
2058 static const struct inode_operations proc_map_files_inode_operations
= {
2059 .lookup
= proc_map_files_lookup
,
2060 .permission
= proc_fd_permission
,
2061 .setattr
= proc_setattr
,
2065 proc_map_files_readdir(struct file
*file
, struct dir_context
*ctx
)
2067 struct vm_area_struct
*vma
;
2068 struct task_struct
*task
;
2069 struct mm_struct
*mm
;
2070 unsigned long nr_files
, pos
, i
;
2071 struct flex_array
*fa
= NULL
;
2072 struct map_files_info info
;
2073 struct map_files_info
*p
;
2077 task
= get_proc_task(file_inode(file
));
2082 if (!ptrace_may_access(task
, PTRACE_MODE_READ_FSCREDS
))
2086 if (!dir_emit_dots(file
, ctx
))
2089 mm
= get_task_mm(task
);
2092 down_read(&mm
->mmap_sem
);
2097 * We need two passes here:
2099 * 1) Collect vmas of mapped files with mmap_sem taken
2100 * 2) Release mmap_sem and instantiate entries
2102 * otherwise we get lockdep complained, since filldir()
2103 * routine might require mmap_sem taken in might_fault().
2106 for (vma
= mm
->mmap
, pos
= 2; vma
; vma
= vma
->vm_next
) {
2107 if (vma
->vm_file
&& ++pos
> ctx
->pos
)
2112 fa
= flex_array_alloc(sizeof(info
), nr_files
,
2114 if (!fa
|| flex_array_prealloc(fa
, 0, nr_files
,
2118 flex_array_free(fa
);
2119 up_read(&mm
->mmap_sem
);
2123 for (i
= 0, vma
= mm
->mmap
, pos
= 2; vma
;
2124 vma
= vma
->vm_next
) {
2127 if (++pos
<= ctx
->pos
)
2130 info
.mode
= vma
->vm_file
->f_mode
;
2131 info
.len
= snprintf(info
.name
,
2132 sizeof(info
.name
), "%lx-%lx",
2133 vma
->vm_start
, vma
->vm_end
);
2134 if (flex_array_put(fa
, i
++, &info
, GFP_KERNEL
))
2138 up_read(&mm
->mmap_sem
);
2140 for (i
= 0; i
< nr_files
; i
++) {
2141 p
= flex_array_get(fa
, i
);
2142 if (!proc_fill_cache(file
, ctx
,
2144 proc_map_files_instantiate
,
2146 (void *)(unsigned long)p
->mode
))
2151 flex_array_free(fa
);
2155 put_task_struct(task
);
2160 static const struct file_operations proc_map_files_operations
= {
2161 .read
= generic_read_dir
,
2162 .iterate_shared
= proc_map_files_readdir
,
2163 .llseek
= generic_file_llseek
,
2166 #ifdef CONFIG_CHECKPOINT_RESTORE
2167 struct timers_private
{
2169 struct task_struct
*task
;
2170 struct sighand_struct
*sighand
;
2171 struct pid_namespace
*ns
;
2172 unsigned long flags
;
2175 static void *timers_start(struct seq_file
*m
, loff_t
*pos
)
2177 struct timers_private
*tp
= m
->private;
2179 tp
->task
= get_pid_task(tp
->pid
, PIDTYPE_PID
);
2181 return ERR_PTR(-ESRCH
);
2183 tp
->sighand
= lock_task_sighand(tp
->task
, &tp
->flags
);
2185 return ERR_PTR(-ESRCH
);
2187 return seq_list_start(&tp
->task
->signal
->posix_timers
, *pos
);
2190 static void *timers_next(struct seq_file
*m
, void *v
, loff_t
*pos
)
2192 struct timers_private
*tp
= m
->private;
2193 return seq_list_next(v
, &tp
->task
->signal
->posix_timers
, pos
);
2196 static void timers_stop(struct seq_file
*m
, void *v
)
2198 struct timers_private
*tp
= m
->private;
2201 unlock_task_sighand(tp
->task
, &tp
->flags
);
2206 put_task_struct(tp
->task
);
2211 static int show_timer(struct seq_file
*m
, void *v
)
2213 struct k_itimer
*timer
;
2214 struct timers_private
*tp
= m
->private;
2216 static const char * const nstr
[] = {
2217 [SIGEV_SIGNAL
] = "signal",
2218 [SIGEV_NONE
] = "none",
2219 [SIGEV_THREAD
] = "thread",
2222 timer
= list_entry((struct list_head
*)v
, struct k_itimer
, list
);
2223 notify
= timer
->it_sigev_notify
;
2225 seq_printf(m
, "ID: %d\n", timer
->it_id
);
2226 seq_printf(m
, "signal: %d/%p\n",
2227 timer
->sigq
->info
.si_signo
,
2228 timer
->sigq
->info
.si_value
.sival_ptr
);
2229 seq_printf(m
, "notify: %s/%s.%d\n",
2230 nstr
[notify
& ~SIGEV_THREAD_ID
],
2231 (notify
& SIGEV_THREAD_ID
) ? "tid" : "pid",
2232 pid_nr_ns(timer
->it_pid
, tp
->ns
));
2233 seq_printf(m
, "ClockID: %d\n", timer
->it_clock
);
2238 static const struct seq_operations proc_timers_seq_ops
= {
2239 .start
= timers_start
,
2240 .next
= timers_next
,
2241 .stop
= timers_stop
,
2245 static int proc_timers_open(struct inode
*inode
, struct file
*file
)
2247 struct timers_private
*tp
;
2249 tp
= __seq_open_private(file
, &proc_timers_seq_ops
,
2250 sizeof(struct timers_private
));
2254 tp
->pid
= proc_pid(inode
);
2255 tp
->ns
= inode
->i_sb
->s_fs_info
;
2259 static const struct file_operations proc_timers_operations
= {
2260 .open
= proc_timers_open
,
2262 .llseek
= seq_lseek
,
2263 .release
= seq_release_private
,
2267 static ssize_t
timerslack_ns_write(struct file
*file
, const char __user
*buf
,
2268 size_t count
, loff_t
*offset
)
2270 struct inode
*inode
= file_inode(file
);
2271 struct task_struct
*p
;
2275 err
= kstrtoull_from_user(buf
, count
, 10, &slack_ns
);
2279 p
= get_proc_task(inode
);
2283 if (ptrace_may_access(p
, PTRACE_MODE_ATTACH_FSCREDS
)) {
2286 p
->timer_slack_ns
= p
->default_timer_slack_ns
;
2288 p
->timer_slack_ns
= slack_ns
;
2298 static int timerslack_ns_show(struct seq_file
*m
, void *v
)
2300 struct inode
*inode
= m
->private;
2301 struct task_struct
*p
;
2304 p
= get_proc_task(inode
);
2308 if (ptrace_may_access(p
, PTRACE_MODE_ATTACH_FSCREDS
)) {
2310 seq_printf(m
, "%llu\n", p
->timer_slack_ns
);
2320 static int timerslack_ns_open(struct inode
*inode
, struct file
*filp
)
2322 return single_open(filp
, timerslack_ns_show
, inode
);
2325 static const struct file_operations proc_pid_set_timerslack_ns_operations
= {
2326 .open
= timerslack_ns_open
,
2328 .write
= timerslack_ns_write
,
2329 .llseek
= seq_lseek
,
2330 .release
= single_release
,
2333 static int proc_pident_instantiate(struct inode
*dir
,
2334 struct dentry
*dentry
, struct task_struct
*task
, const void *ptr
)
2336 const struct pid_entry
*p
= ptr
;
2337 struct inode
*inode
;
2338 struct proc_inode
*ei
;
2340 inode
= proc_pid_make_inode(dir
->i_sb
, task
);
2345 inode
->i_mode
= p
->mode
;
2346 if (S_ISDIR(inode
->i_mode
))
2347 set_nlink(inode
, 2); /* Use getattr to fix if necessary */
2349 inode
->i_op
= p
->iop
;
2351 inode
->i_fop
= p
->fop
;
2353 d_set_d_op(dentry
, &pid_dentry_operations
);
2354 d_add(dentry
, inode
);
2355 /* Close the race of the process dying before we return the dentry */
2356 if (pid_revalidate(dentry
, 0))
2362 static struct dentry
*proc_pident_lookup(struct inode
*dir
,
2363 struct dentry
*dentry
,
2364 const struct pid_entry
*ents
,
2368 struct task_struct
*task
= get_proc_task(dir
);
2369 const struct pid_entry
*p
, *last
;
2377 * Yes, it does not scale. And it should not. Don't add
2378 * new entries into /proc/<tgid>/ without very good reasons.
2380 last
= &ents
[nents
- 1];
2381 for (p
= ents
; p
<= last
; p
++) {
2382 if (p
->len
!= dentry
->d_name
.len
)
2384 if (!memcmp(dentry
->d_name
.name
, p
->name
, p
->len
))
2390 error
= proc_pident_instantiate(dir
, dentry
, task
, p
);
2392 put_task_struct(task
);
2394 return ERR_PTR(error
);
2397 static int proc_pident_readdir(struct file
*file
, struct dir_context
*ctx
,
2398 const struct pid_entry
*ents
, unsigned int nents
)
2400 struct task_struct
*task
= get_proc_task(file_inode(file
));
2401 const struct pid_entry
*p
;
2406 if (!dir_emit_dots(file
, ctx
))
2409 if (ctx
->pos
>= nents
+ 2)
2412 for (p
= ents
+ (ctx
->pos
- 2); p
<= ents
+ nents
- 1; p
++) {
2413 if (!proc_fill_cache(file
, ctx
, p
->name
, p
->len
,
2414 proc_pident_instantiate
, task
, p
))
2419 put_task_struct(task
);
2423 #ifdef CONFIG_SECURITY
2424 static ssize_t
proc_pid_attr_read(struct file
* file
, char __user
* buf
,
2425 size_t count
, loff_t
*ppos
)
2427 struct inode
* inode
= file_inode(file
);
2430 struct task_struct
*task
= get_proc_task(inode
);
2435 length
= security_getprocattr(task
,
2436 (char*)file
->f_path
.dentry
->d_name
.name
,
2438 put_task_struct(task
);
2440 length
= simple_read_from_buffer(buf
, count
, ppos
, p
, length
);
2445 static ssize_t
proc_pid_attr_write(struct file
* file
, const char __user
* buf
,
2446 size_t count
, loff_t
*ppos
)
2448 struct inode
* inode
= file_inode(file
);
2451 struct task_struct
*task
= get_proc_task(inode
);
2456 if (count
> PAGE_SIZE
)
2459 /* No partial writes. */
2464 page
= memdup_user(buf
, count
);
2466 length
= PTR_ERR(page
);
2470 /* Guard against adverse ptrace interaction */
2471 length
= mutex_lock_interruptible(&task
->signal
->cred_guard_mutex
);
2475 length
= security_setprocattr(task
,
2476 (char*)file
->f_path
.dentry
->d_name
.name
,
2478 mutex_unlock(&task
->signal
->cred_guard_mutex
);
2482 put_task_struct(task
);
2487 static const struct file_operations proc_pid_attr_operations
= {
2488 .read
= proc_pid_attr_read
,
2489 .write
= proc_pid_attr_write
,
2490 .llseek
= generic_file_llseek
,
2493 static const struct pid_entry attr_dir_stuff
[] = {
2494 REG("current", S_IRUGO
|S_IWUGO
, proc_pid_attr_operations
),
2495 REG("prev", S_IRUGO
, proc_pid_attr_operations
),
2496 REG("exec", S_IRUGO
|S_IWUGO
, proc_pid_attr_operations
),
2497 REG("fscreate", S_IRUGO
|S_IWUGO
, proc_pid_attr_operations
),
2498 REG("keycreate", S_IRUGO
|S_IWUGO
, proc_pid_attr_operations
),
2499 REG("sockcreate", S_IRUGO
|S_IWUGO
, proc_pid_attr_operations
),
2502 static int proc_attr_dir_readdir(struct file
*file
, struct dir_context
*ctx
)
2504 return proc_pident_readdir(file
, ctx
,
2505 attr_dir_stuff
, ARRAY_SIZE(attr_dir_stuff
));
2508 static const struct file_operations proc_attr_dir_operations
= {
2509 .read
= generic_read_dir
,
2510 .iterate_shared
= proc_attr_dir_readdir
,
2511 .llseek
= generic_file_llseek
,
2514 static struct dentry
*proc_attr_dir_lookup(struct inode
*dir
,
2515 struct dentry
*dentry
, unsigned int flags
)
2517 return proc_pident_lookup(dir
, dentry
,
2518 attr_dir_stuff
, ARRAY_SIZE(attr_dir_stuff
));
2521 static const struct inode_operations proc_attr_dir_inode_operations
= {
2522 .lookup
= proc_attr_dir_lookup
,
2523 .getattr
= pid_getattr
,
2524 .setattr
= proc_setattr
,
2529 #ifdef CONFIG_ELF_CORE
2530 static ssize_t
proc_coredump_filter_read(struct file
*file
, char __user
*buf
,
2531 size_t count
, loff_t
*ppos
)
2533 struct task_struct
*task
= get_proc_task(file_inode(file
));
2534 struct mm_struct
*mm
;
2535 char buffer
[PROC_NUMBUF
];
2543 mm
= get_task_mm(task
);
2545 len
= snprintf(buffer
, sizeof(buffer
), "%08lx\n",
2546 ((mm
->flags
& MMF_DUMP_FILTER_MASK
) >>
2547 MMF_DUMP_FILTER_SHIFT
));
2549 ret
= simple_read_from_buffer(buf
, count
, ppos
, buffer
, len
);
2552 put_task_struct(task
);
2557 static ssize_t
proc_coredump_filter_write(struct file
*file
,
2558 const char __user
*buf
,
2562 struct task_struct
*task
;
2563 struct mm_struct
*mm
;
2569 ret
= kstrtouint_from_user(buf
, count
, 0, &val
);
2574 task
= get_proc_task(file_inode(file
));
2578 mm
= get_task_mm(task
);
2583 for (i
= 0, mask
= 1; i
< MMF_DUMP_FILTER_BITS
; i
++, mask
<<= 1) {
2585 set_bit(i
+ MMF_DUMP_FILTER_SHIFT
, &mm
->flags
);
2587 clear_bit(i
+ MMF_DUMP_FILTER_SHIFT
, &mm
->flags
);
2592 put_task_struct(task
);
2599 static const struct file_operations proc_coredump_filter_operations
= {
2600 .read
= proc_coredump_filter_read
,
2601 .write
= proc_coredump_filter_write
,
2602 .llseek
= generic_file_llseek
,
2606 #ifdef CONFIG_TASK_IO_ACCOUNTING
2607 static int do_io_accounting(struct task_struct
*task
, struct seq_file
*m
, int whole
)
2609 struct task_io_accounting acct
= task
->ioac
;
2610 unsigned long flags
;
2613 result
= mutex_lock_killable(&task
->signal
->cred_guard_mutex
);
2617 if (!ptrace_may_access(task
, PTRACE_MODE_READ_FSCREDS
)) {
2622 if (whole
&& lock_task_sighand(task
, &flags
)) {
2623 struct task_struct
*t
= task
;
2625 task_io_accounting_add(&acct
, &task
->signal
->ioac
);
2626 while_each_thread(task
, t
)
2627 task_io_accounting_add(&acct
, &t
->ioac
);
2629 unlock_task_sighand(task
, &flags
);
2636 "read_bytes: %llu\n"
2637 "write_bytes: %llu\n"
2638 "cancelled_write_bytes: %llu\n",
2639 (unsigned long long)acct
.rchar
,
2640 (unsigned long long)acct
.wchar
,
2641 (unsigned long long)acct
.syscr
,
2642 (unsigned long long)acct
.syscw
,
2643 (unsigned long long)acct
.read_bytes
,
2644 (unsigned long long)acct
.write_bytes
,
2645 (unsigned long long)acct
.cancelled_write_bytes
);
2649 mutex_unlock(&task
->signal
->cred_guard_mutex
);
2653 static int proc_tid_io_accounting(struct seq_file
*m
, struct pid_namespace
*ns
,
2654 struct pid
*pid
, struct task_struct
*task
)
2656 return do_io_accounting(task
, m
, 0);
2659 static int proc_tgid_io_accounting(struct seq_file
*m
, struct pid_namespace
*ns
,
2660 struct pid
*pid
, struct task_struct
*task
)
2662 return do_io_accounting(task
, m
, 1);
2664 #endif /* CONFIG_TASK_IO_ACCOUNTING */
2666 #ifdef CONFIG_USER_NS
2667 static int proc_id_map_open(struct inode
*inode
, struct file
*file
,
2668 const struct seq_operations
*seq_ops
)
2670 struct user_namespace
*ns
= NULL
;
2671 struct task_struct
*task
;
2672 struct seq_file
*seq
;
2675 task
= get_proc_task(inode
);
2678 ns
= get_user_ns(task_cred_xxx(task
, user_ns
));
2680 put_task_struct(task
);
2685 ret
= seq_open(file
, seq_ops
);
2689 seq
= file
->private_data
;
2699 static int proc_id_map_release(struct inode
*inode
, struct file
*file
)
2701 struct seq_file
*seq
= file
->private_data
;
2702 struct user_namespace
*ns
= seq
->private;
2704 return seq_release(inode
, file
);
2707 static int proc_uid_map_open(struct inode
*inode
, struct file
*file
)
2709 return proc_id_map_open(inode
, file
, &proc_uid_seq_operations
);
2712 static int proc_gid_map_open(struct inode
*inode
, struct file
*file
)
2714 return proc_id_map_open(inode
, file
, &proc_gid_seq_operations
);
2717 static int proc_projid_map_open(struct inode
*inode
, struct file
*file
)
2719 return proc_id_map_open(inode
, file
, &proc_projid_seq_operations
);
2722 static const struct file_operations proc_uid_map_operations
= {
2723 .open
= proc_uid_map_open
,
2724 .write
= proc_uid_map_write
,
2726 .llseek
= seq_lseek
,
2727 .release
= proc_id_map_release
,
2730 static const struct file_operations proc_gid_map_operations
= {
2731 .open
= proc_gid_map_open
,
2732 .write
= proc_gid_map_write
,
2734 .llseek
= seq_lseek
,
2735 .release
= proc_id_map_release
,
2738 static const struct file_operations proc_projid_map_operations
= {
2739 .open
= proc_projid_map_open
,
2740 .write
= proc_projid_map_write
,
2742 .llseek
= seq_lseek
,
2743 .release
= proc_id_map_release
,
2746 static int proc_setgroups_open(struct inode
*inode
, struct file
*file
)
2748 struct user_namespace
*ns
= NULL
;
2749 struct task_struct
*task
;
2753 task
= get_proc_task(inode
);
2756 ns
= get_user_ns(task_cred_xxx(task
, user_ns
));
2758 put_task_struct(task
);
2763 if (file
->f_mode
& FMODE_WRITE
) {
2765 if (!ns_capable(ns
, CAP_SYS_ADMIN
))
2769 ret
= single_open(file
, &proc_setgroups_show
, ns
);
2780 static int proc_setgroups_release(struct inode
*inode
, struct file
*file
)
2782 struct seq_file
*seq
= file
->private_data
;
2783 struct user_namespace
*ns
= seq
->private;
2784 int ret
= single_release(inode
, file
);
2789 static const struct file_operations proc_setgroups_operations
= {
2790 .open
= proc_setgroups_open
,
2791 .write
= proc_setgroups_write
,
2793 .llseek
= seq_lseek
,
2794 .release
= proc_setgroups_release
,
2796 #endif /* CONFIG_USER_NS */
2798 static int proc_pid_personality(struct seq_file
*m
, struct pid_namespace
*ns
,
2799 struct pid
*pid
, struct task_struct
*task
)
2801 int err
= lock_trace(task
);
2803 seq_printf(m
, "%08x\n", task
->personality
);
2812 static const struct file_operations proc_task_operations
;
2813 static const struct inode_operations proc_task_inode_operations
;
2815 static const struct pid_entry tgid_base_stuff
[] = {
2816 DIR("task", S_IRUGO
|S_IXUGO
, proc_task_inode_operations
, proc_task_operations
),
2817 DIR("fd", S_IRUSR
|S_IXUSR
, proc_fd_inode_operations
, proc_fd_operations
),
2818 DIR("map_files", S_IRUSR
|S_IXUSR
, proc_map_files_inode_operations
, proc_map_files_operations
),
2819 DIR("fdinfo", S_IRUSR
|S_IXUSR
, proc_fdinfo_inode_operations
, proc_fdinfo_operations
),
2820 DIR("ns", S_IRUSR
|S_IXUGO
, proc_ns_dir_inode_operations
, proc_ns_dir_operations
),
2822 DIR("net", S_IRUGO
|S_IXUGO
, proc_net_inode_operations
, proc_net_operations
),
2824 REG("environ", S_IRUSR
, proc_environ_operations
),
2825 ONE("auxv", S_IRUSR
, proc_pid_auxv
),
2826 ONE("status", S_IRUGO
, proc_pid_status
),
2827 ONE("personality", S_IRUSR
, proc_pid_personality
),
2828 ONE("limits", S_IRUGO
, proc_pid_limits
),
2829 #ifdef CONFIG_SCHED_DEBUG
2830 REG("sched", S_IRUGO
|S_IWUSR
, proc_pid_sched_operations
),
2832 #ifdef CONFIG_SCHED_AUTOGROUP
2833 REG("autogroup", S_IRUGO
|S_IWUSR
, proc_pid_sched_autogroup_operations
),
2835 REG("comm", S_IRUGO
|S_IWUSR
, proc_pid_set_comm_operations
),
2836 #ifdef CONFIG_HAVE_ARCH_TRACEHOOK
2837 ONE("syscall", S_IRUSR
, proc_pid_syscall
),
2839 REG("cmdline", S_IRUGO
, proc_pid_cmdline_ops
),
2840 ONE("stat", S_IRUGO
, proc_tgid_stat
),
2841 ONE("statm", S_IRUGO
, proc_pid_statm
),
2842 REG("maps", S_IRUGO
, proc_pid_maps_operations
),
2844 REG("numa_maps", S_IRUGO
, proc_pid_numa_maps_operations
),
2846 REG("mem", S_IRUSR
|S_IWUSR
, proc_mem_operations
),
2847 LNK("cwd", proc_cwd_link
),
2848 LNK("root", proc_root_link
),
2849 LNK("exe", proc_exe_link
),
2850 REG("mounts", S_IRUGO
, proc_mounts_operations
),
2851 REG("mountinfo", S_IRUGO
, proc_mountinfo_operations
),
2852 REG("mountstats", S_IRUSR
, proc_mountstats_operations
),
2853 #ifdef CONFIG_PROC_PAGE_MONITOR
2854 REG("clear_refs", S_IWUSR
, proc_clear_refs_operations
),
2855 REG("smaps", S_IRUGO
, proc_pid_smaps_operations
),
2856 REG("pagemap", S_IRUSR
, proc_pagemap_operations
),
2858 #ifdef CONFIG_SECURITY
2859 DIR("attr", S_IRUGO
|S_IXUGO
, proc_attr_dir_inode_operations
, proc_attr_dir_operations
),
2861 #ifdef CONFIG_KALLSYMS
2862 ONE("wchan", S_IRUGO
, proc_pid_wchan
),
2864 #ifdef CONFIG_STACKTRACE
2865 ONE("stack", S_IRUSR
, proc_pid_stack
),
2867 #ifdef CONFIG_SCHED_INFO
2868 ONE("schedstat", S_IRUGO
, proc_pid_schedstat
),
2870 #ifdef CONFIG_LATENCYTOP
2871 REG("latency", S_IRUGO
, proc_lstats_operations
),
2873 #ifdef CONFIG_PROC_PID_CPUSET
2874 ONE("cpuset", S_IRUGO
, proc_cpuset_show
),
2876 #ifdef CONFIG_CGROUPS
2877 ONE("cgroup", S_IRUGO
, proc_cgroup_show
),
2879 ONE("oom_score", S_IRUGO
, proc_oom_score
),
2880 REG("oom_adj", S_IRUGO
|S_IWUSR
, proc_oom_adj_operations
),
2881 REG("oom_score_adj", S_IRUGO
|S_IWUSR
, proc_oom_score_adj_operations
),
2882 #ifdef CONFIG_AUDITSYSCALL
2883 REG("loginuid", S_IWUSR
|S_IRUGO
, proc_loginuid_operations
),
2884 REG("sessionid", S_IRUGO
, proc_sessionid_operations
),
2886 #ifdef CONFIG_FAULT_INJECTION
2887 REG("make-it-fail", S_IRUGO
|S_IWUSR
, proc_fault_inject_operations
),
2889 #ifdef CONFIG_ELF_CORE
2890 REG("coredump_filter", S_IRUGO
|S_IWUSR
, proc_coredump_filter_operations
),
2892 #ifdef CONFIG_TASK_IO_ACCOUNTING
2893 ONE("io", S_IRUSR
, proc_tgid_io_accounting
),
2895 #ifdef CONFIG_HARDWALL
2896 ONE("hardwall", S_IRUGO
, proc_pid_hardwall
),
2898 #ifdef CONFIG_USER_NS
2899 REG("uid_map", S_IRUGO
|S_IWUSR
, proc_uid_map_operations
),
2900 REG("gid_map", S_IRUGO
|S_IWUSR
, proc_gid_map_operations
),
2901 REG("projid_map", S_IRUGO
|S_IWUSR
, proc_projid_map_operations
),
2902 REG("setgroups", S_IRUGO
|S_IWUSR
, proc_setgroups_operations
),
2904 #ifdef CONFIG_CHECKPOINT_RESTORE
2905 REG("timers", S_IRUGO
, proc_timers_operations
),
2907 REG("timerslack_ns", S_IRUGO
|S_IWUGO
, proc_pid_set_timerslack_ns_operations
),
2910 static int proc_tgid_base_readdir(struct file
*file
, struct dir_context
*ctx
)
2912 return proc_pident_readdir(file
, ctx
,
2913 tgid_base_stuff
, ARRAY_SIZE(tgid_base_stuff
));
2916 static const struct file_operations proc_tgid_base_operations
= {
2917 .read
= generic_read_dir
,
2918 .iterate_shared
= proc_tgid_base_readdir
,
2919 .llseek
= generic_file_llseek
,
2922 static struct dentry
*proc_tgid_base_lookup(struct inode
*dir
, struct dentry
*dentry
, unsigned int flags
)
2924 return proc_pident_lookup(dir
, dentry
,
2925 tgid_base_stuff
, ARRAY_SIZE(tgid_base_stuff
));
2928 static const struct inode_operations proc_tgid_base_inode_operations
= {
2929 .lookup
= proc_tgid_base_lookup
,
2930 .getattr
= pid_getattr
,
2931 .setattr
= proc_setattr
,
2932 .permission
= proc_pid_permission
,
2935 static void proc_flush_task_mnt(struct vfsmount
*mnt
, pid_t pid
, pid_t tgid
)
2937 struct dentry
*dentry
, *leader
, *dir
;
2938 char buf
[PROC_NUMBUF
];
2942 name
.len
= snprintf(buf
, sizeof(buf
), "%d", pid
);
2943 /* no ->d_hash() rejects on procfs */
2944 dentry
= d_hash_and_lookup(mnt
->mnt_root
, &name
);
2946 d_invalidate(dentry
);
2954 name
.len
= snprintf(buf
, sizeof(buf
), "%d", tgid
);
2955 leader
= d_hash_and_lookup(mnt
->mnt_root
, &name
);
2960 name
.len
= strlen(name
.name
);
2961 dir
= d_hash_and_lookup(leader
, &name
);
2963 goto out_put_leader
;
2966 name
.len
= snprintf(buf
, sizeof(buf
), "%d", pid
);
2967 dentry
= d_hash_and_lookup(dir
, &name
);
2969 d_invalidate(dentry
);
2981 * proc_flush_task - Remove dcache entries for @task from the /proc dcache.
2982 * @task: task that should be flushed.
2984 * When flushing dentries from proc, one needs to flush them from global
2985 * proc (proc_mnt) and from all the namespaces' procs this task was seen
2986 * in. This call is supposed to do all of this job.
2988 * Looks in the dcache for
2990 * /proc/@tgid/task/@pid
2991 * if either directory is present flushes it and all of it'ts children
2994 * It is safe and reasonable to cache /proc entries for a task until
2995 * that task exits. After that they just clog up the dcache with
2996 * useless entries, possibly causing useful dcache entries to be
2997 * flushed instead. This routine is proved to flush those useless
2998 * dcache entries at process exit time.
3000 * NOTE: This routine is just an optimization so it does not guarantee
3001 * that no dcache entries will exist at process exit time it
3002 * just makes it very unlikely that any will persist.
3005 void proc_flush_task(struct task_struct
*task
)
3008 struct pid
*pid
, *tgid
;
3011 pid
= task_pid(task
);
3012 tgid
= task_tgid(task
);
3014 for (i
= 0; i
<= pid
->level
; i
++) {
3015 upid
= &pid
->numbers
[i
];
3016 proc_flush_task_mnt(upid
->ns
->proc_mnt
, upid
->nr
,
3017 tgid
->numbers
[i
].nr
);
3021 static int proc_pid_instantiate(struct inode
*dir
,
3022 struct dentry
* dentry
,
3023 struct task_struct
*task
, const void *ptr
)
3025 struct inode
*inode
;
3027 inode
= proc_pid_make_inode(dir
->i_sb
, task
);
3031 inode
->i_mode
= S_IFDIR
|S_IRUGO
|S_IXUGO
;
3032 inode
->i_op
= &proc_tgid_base_inode_operations
;
3033 inode
->i_fop
= &proc_tgid_base_operations
;
3034 inode
->i_flags
|=S_IMMUTABLE
;
3036 set_nlink(inode
, 2 + pid_entry_count_dirs(tgid_base_stuff
,
3037 ARRAY_SIZE(tgid_base_stuff
)));
3039 d_set_d_op(dentry
, &pid_dentry_operations
);
3041 d_add(dentry
, inode
);
3042 /* Close the race of the process dying before we return the dentry */
3043 if (pid_revalidate(dentry
, 0))
3049 struct dentry
*proc_pid_lookup(struct inode
*dir
, struct dentry
* dentry
, unsigned int flags
)
3051 int result
= -ENOENT
;
3052 struct task_struct
*task
;
3054 struct pid_namespace
*ns
;
3056 tgid
= name_to_int(&dentry
->d_name
);
3060 ns
= dentry
->d_sb
->s_fs_info
;
3062 task
= find_task_by_pid_ns(tgid
, ns
);
3064 get_task_struct(task
);
3069 result
= proc_pid_instantiate(dir
, dentry
, task
, NULL
);
3070 put_task_struct(task
);
3072 return ERR_PTR(result
);
3076 * Find the first task with tgid >= tgid
3081 struct task_struct
*task
;
3083 static struct tgid_iter
next_tgid(struct pid_namespace
*ns
, struct tgid_iter iter
)
3088 put_task_struct(iter
.task
);
3092 pid
= find_ge_pid(iter
.tgid
, ns
);
3094 iter
.tgid
= pid_nr_ns(pid
, ns
);
3095 iter
.task
= pid_task(pid
, PIDTYPE_PID
);
3096 /* What we to know is if the pid we have find is the
3097 * pid of a thread_group_leader. Testing for task
3098 * being a thread_group_leader is the obvious thing
3099 * todo but there is a window when it fails, due to
3100 * the pid transfer logic in de_thread.
3102 * So we perform the straight forward test of seeing
3103 * if the pid we have found is the pid of a thread
3104 * group leader, and don't worry if the task we have
3105 * found doesn't happen to be a thread group leader.
3106 * As we don't care in the case of readdir.
3108 if (!iter
.task
|| !has_group_leader_pid(iter
.task
)) {
3112 get_task_struct(iter
.task
);
3118 #define TGID_OFFSET (FIRST_PROCESS_ENTRY + 2)
3120 /* for the /proc/ directory itself, after non-process stuff has been done */
3121 int proc_pid_readdir(struct file
*file
, struct dir_context
*ctx
)
3123 struct tgid_iter iter
;
3124 struct pid_namespace
*ns
= file_inode(file
)->i_sb
->s_fs_info
;
3125 loff_t pos
= ctx
->pos
;
3127 if (pos
>= PID_MAX_LIMIT
+ TGID_OFFSET
)
3130 if (pos
== TGID_OFFSET
- 2) {
3131 struct inode
*inode
= d_inode(ns
->proc_self
);
3132 if (!dir_emit(ctx
, "self", 4, inode
->i_ino
, DT_LNK
))
3134 ctx
->pos
= pos
= pos
+ 1;
3136 if (pos
== TGID_OFFSET
- 1) {
3137 struct inode
*inode
= d_inode(ns
->proc_thread_self
);
3138 if (!dir_emit(ctx
, "thread-self", 11, inode
->i_ino
, DT_LNK
))
3140 ctx
->pos
= pos
= pos
+ 1;
3142 iter
.tgid
= pos
- TGID_OFFSET
;
3144 for (iter
= next_tgid(ns
, iter
);
3146 iter
.tgid
+= 1, iter
= next_tgid(ns
, iter
)) {
3147 char name
[PROC_NUMBUF
];
3149 if (!has_pid_permissions(ns
, iter
.task
, 2))
3152 len
= snprintf(name
, sizeof(name
), "%d", iter
.tgid
);
3153 ctx
->pos
= iter
.tgid
+ TGID_OFFSET
;
3154 if (!proc_fill_cache(file
, ctx
, name
, len
,
3155 proc_pid_instantiate
, iter
.task
, NULL
)) {
3156 put_task_struct(iter
.task
);
3160 ctx
->pos
= PID_MAX_LIMIT
+ TGID_OFFSET
;
3165 * proc_tid_comm_permission is a special permission function exclusively
3166 * used for the node /proc/<pid>/task/<tid>/comm.
3167 * It bypasses generic permission checks in the case where a task of the same
3168 * task group attempts to access the node.
3169 * The rationale behind this is that glibc and bionic access this node for
3170 * cross thread naming (pthread_set/getname_np(!self)). However, if
3171 * PR_SET_DUMPABLE gets set to 0 this node among others becomes uid=0 gid=0,
3172 * which locks out the cross thread naming implementation.
3173 * This function makes sure that the node is always accessible for members of
3174 * same thread group.
3176 static int proc_tid_comm_permission(struct inode
*inode
, int mask
)
3178 bool is_same_tgroup
;
3179 struct task_struct
*task
;
3181 task
= get_proc_task(inode
);
3184 is_same_tgroup
= same_thread_group(current
, task
);
3185 put_task_struct(task
);
3187 if (likely(is_same_tgroup
&& !(mask
& MAY_EXEC
))) {
3188 /* This file (/proc/<pid>/task/<tid>/comm) can always be
3189 * read or written by the members of the corresponding
3195 return generic_permission(inode
, mask
);
3198 static const struct inode_operations proc_tid_comm_inode_operations
= {
3199 .permission
= proc_tid_comm_permission
,
3205 static const struct pid_entry tid_base_stuff
[] = {
3206 DIR("fd", S_IRUSR
|S_IXUSR
, proc_fd_inode_operations
, proc_fd_operations
),
3207 DIR("fdinfo", S_IRUSR
|S_IXUSR
, proc_fdinfo_inode_operations
, proc_fdinfo_operations
),
3208 DIR("ns", S_IRUSR
|S_IXUGO
, proc_ns_dir_inode_operations
, proc_ns_dir_operations
),
3210 DIR("net", S_IRUGO
|S_IXUGO
, proc_net_inode_operations
, proc_net_operations
),
3212 REG("environ", S_IRUSR
, proc_environ_operations
),
3213 ONE("auxv", S_IRUSR
, proc_pid_auxv
),
3214 ONE("status", S_IRUGO
, proc_pid_status
),
3215 ONE("personality", S_IRUSR
, proc_pid_personality
),
3216 ONE("limits", S_IRUGO
, proc_pid_limits
),
3217 #ifdef CONFIG_SCHED_DEBUG
3218 REG("sched", S_IRUGO
|S_IWUSR
, proc_pid_sched_operations
),
3220 NOD("comm", S_IFREG
|S_IRUGO
|S_IWUSR
,
3221 &proc_tid_comm_inode_operations
,
3222 &proc_pid_set_comm_operations
, {}),
3223 #ifdef CONFIG_HAVE_ARCH_TRACEHOOK
3224 ONE("syscall", S_IRUSR
, proc_pid_syscall
),
3226 REG("cmdline", S_IRUGO
, proc_pid_cmdline_ops
),
3227 ONE("stat", S_IRUGO
, proc_tid_stat
),
3228 ONE("statm", S_IRUGO
, proc_pid_statm
),
3229 REG("maps", S_IRUGO
, proc_tid_maps_operations
),
3230 #ifdef CONFIG_PROC_CHILDREN
3231 REG("children", S_IRUGO
, proc_tid_children_operations
),
3234 REG("numa_maps", S_IRUGO
, proc_tid_numa_maps_operations
),
3236 REG("mem", S_IRUSR
|S_IWUSR
, proc_mem_operations
),
3237 LNK("cwd", proc_cwd_link
),
3238 LNK("root", proc_root_link
),
3239 LNK("exe", proc_exe_link
),
3240 REG("mounts", S_IRUGO
, proc_mounts_operations
),
3241 REG("mountinfo", S_IRUGO
, proc_mountinfo_operations
),
3242 #ifdef CONFIG_PROC_PAGE_MONITOR
3243 REG("clear_refs", S_IWUSR
, proc_clear_refs_operations
),
3244 REG("smaps", S_IRUGO
, proc_tid_smaps_operations
),
3245 REG("pagemap", S_IRUSR
, proc_pagemap_operations
),
3247 #ifdef CONFIG_SECURITY
3248 DIR("attr", S_IRUGO
|S_IXUGO
, proc_attr_dir_inode_operations
, proc_attr_dir_operations
),
3250 #ifdef CONFIG_KALLSYMS
3251 ONE("wchan", S_IRUGO
, proc_pid_wchan
),
3253 #ifdef CONFIG_STACKTRACE
3254 ONE("stack", S_IRUSR
, proc_pid_stack
),
3256 #ifdef CONFIG_SCHED_INFO
3257 ONE("schedstat", S_IRUGO
, proc_pid_schedstat
),
3259 #ifdef CONFIG_LATENCYTOP
3260 REG("latency", S_IRUGO
, proc_lstats_operations
),
3262 #ifdef CONFIG_PROC_PID_CPUSET
3263 ONE("cpuset", S_IRUGO
, proc_cpuset_show
),
3265 #ifdef CONFIG_CGROUPS
3266 ONE("cgroup", S_IRUGO
, proc_cgroup_show
),
3268 ONE("oom_score", S_IRUGO
, proc_oom_score
),
3269 REG("oom_adj", S_IRUGO
|S_IWUSR
, proc_oom_adj_operations
),
3270 REG("oom_score_adj", S_IRUGO
|S_IWUSR
, proc_oom_score_adj_operations
),
3271 #ifdef CONFIG_AUDITSYSCALL
3272 REG("loginuid", S_IWUSR
|S_IRUGO
, proc_loginuid_operations
),
3273 REG("sessionid", S_IRUGO
, proc_sessionid_operations
),
3275 #ifdef CONFIG_FAULT_INJECTION
3276 REG("make-it-fail", S_IRUGO
|S_IWUSR
, proc_fault_inject_operations
),
3278 #ifdef CONFIG_TASK_IO_ACCOUNTING
3279 ONE("io", S_IRUSR
, proc_tid_io_accounting
),
3281 #ifdef CONFIG_HARDWALL
3282 ONE("hardwall", S_IRUGO
, proc_pid_hardwall
),
3284 #ifdef CONFIG_USER_NS
3285 REG("uid_map", S_IRUGO
|S_IWUSR
, proc_uid_map_operations
),
3286 REG("gid_map", S_IRUGO
|S_IWUSR
, proc_gid_map_operations
),
3287 REG("projid_map", S_IRUGO
|S_IWUSR
, proc_projid_map_operations
),
3288 REG("setgroups", S_IRUGO
|S_IWUSR
, proc_setgroups_operations
),
3292 static int proc_tid_base_readdir(struct file
*file
, struct dir_context
*ctx
)
3294 return proc_pident_readdir(file
, ctx
,
3295 tid_base_stuff
, ARRAY_SIZE(tid_base_stuff
));
3298 static struct dentry
*proc_tid_base_lookup(struct inode
*dir
, struct dentry
*dentry
, unsigned int flags
)
3300 return proc_pident_lookup(dir
, dentry
,
3301 tid_base_stuff
, ARRAY_SIZE(tid_base_stuff
));
3304 static const struct file_operations proc_tid_base_operations
= {
3305 .read
= generic_read_dir
,
3306 .iterate_shared
= proc_tid_base_readdir
,
3307 .llseek
= generic_file_llseek
,
3310 static const struct inode_operations proc_tid_base_inode_operations
= {
3311 .lookup
= proc_tid_base_lookup
,
3312 .getattr
= pid_getattr
,
3313 .setattr
= proc_setattr
,
3316 static int proc_task_instantiate(struct inode
*dir
,
3317 struct dentry
*dentry
, struct task_struct
*task
, const void *ptr
)
3319 struct inode
*inode
;
3320 inode
= proc_pid_make_inode(dir
->i_sb
, task
);
3324 inode
->i_mode
= S_IFDIR
|S_IRUGO
|S_IXUGO
;
3325 inode
->i_op
= &proc_tid_base_inode_operations
;
3326 inode
->i_fop
= &proc_tid_base_operations
;
3327 inode
->i_flags
|=S_IMMUTABLE
;
3329 set_nlink(inode
, 2 + pid_entry_count_dirs(tid_base_stuff
,
3330 ARRAY_SIZE(tid_base_stuff
)));
3332 d_set_d_op(dentry
, &pid_dentry_operations
);
3334 d_add(dentry
, inode
);
3335 /* Close the race of the process dying before we return the dentry */
3336 if (pid_revalidate(dentry
, 0))
3342 static struct dentry
*proc_task_lookup(struct inode
*dir
, struct dentry
* dentry
, unsigned int flags
)
3344 int result
= -ENOENT
;
3345 struct task_struct
*task
;
3346 struct task_struct
*leader
= get_proc_task(dir
);
3348 struct pid_namespace
*ns
;
3353 tid
= name_to_int(&dentry
->d_name
);
3357 ns
= dentry
->d_sb
->s_fs_info
;
3359 task
= find_task_by_pid_ns(tid
, ns
);
3361 get_task_struct(task
);
3365 if (!same_thread_group(leader
, task
))
3368 result
= proc_task_instantiate(dir
, dentry
, task
, NULL
);
3370 put_task_struct(task
);
3372 put_task_struct(leader
);
3374 return ERR_PTR(result
);
3378 * Find the first tid of a thread group to return to user space.
3380 * Usually this is just the thread group leader, but if the users
3381 * buffer was too small or there was a seek into the middle of the
3382 * directory we have more work todo.
3384 * In the case of a short read we start with find_task_by_pid.
3386 * In the case of a seek we start with the leader and walk nr
3389 static struct task_struct
*first_tid(struct pid
*pid
, int tid
, loff_t f_pos
,
3390 struct pid_namespace
*ns
)
3392 struct task_struct
*pos
, *task
;
3393 unsigned long nr
= f_pos
;
3395 if (nr
!= f_pos
) /* 32bit overflow? */
3399 task
= pid_task(pid
, PIDTYPE_PID
);
3403 /* Attempt to start with the tid of a thread */
3405 pos
= find_task_by_pid_ns(tid
, ns
);
3406 if (pos
&& same_thread_group(pos
, task
))
3410 /* If nr exceeds the number of threads there is nothing todo */
3411 if (nr
>= get_nr_threads(task
))
3414 /* If we haven't found our starting place yet start
3415 * with the leader and walk nr threads forward.
3417 pos
= task
= task
->group_leader
;
3421 } while_each_thread(task
, pos
);
3426 get_task_struct(pos
);
3433 * Find the next thread in the thread list.
3434 * Return NULL if there is an error or no next thread.
3436 * The reference to the input task_struct is released.
3438 static struct task_struct
*next_tid(struct task_struct
*start
)
3440 struct task_struct
*pos
= NULL
;
3442 if (pid_alive(start
)) {
3443 pos
= next_thread(start
);
3444 if (thread_group_leader(pos
))
3447 get_task_struct(pos
);
3450 put_task_struct(start
);
3454 /* for the /proc/TGID/task/ directories */
3455 static int proc_task_readdir(struct file
*file
, struct dir_context
*ctx
)
3457 struct inode
*inode
= file_inode(file
);
3458 struct task_struct
*task
;
3459 struct pid_namespace
*ns
;
3462 if (proc_inode_is_dead(inode
))
3465 if (!dir_emit_dots(file
, ctx
))
3468 /* f_version caches the tgid value that the last readdir call couldn't
3469 * return. lseek aka telldir automagically resets f_version to 0.
3471 ns
= inode
->i_sb
->s_fs_info
;
3472 tid
= (int)file
->f_version
;
3473 file
->f_version
= 0;
3474 for (task
= first_tid(proc_pid(inode
), tid
, ctx
->pos
- 2, ns
);
3476 task
= next_tid(task
), ctx
->pos
++) {
3477 char name
[PROC_NUMBUF
];
3479 tid
= task_pid_nr_ns(task
, ns
);
3480 len
= snprintf(name
, sizeof(name
), "%d", tid
);
3481 if (!proc_fill_cache(file
, ctx
, name
, len
,
3482 proc_task_instantiate
, task
, NULL
)) {
3483 /* returning this tgid failed, save it as the first
3484 * pid for the next readir call */
3485 file
->f_version
= (u64
)tid
;
3486 put_task_struct(task
);
3494 static int proc_task_getattr(struct vfsmount
*mnt
, struct dentry
*dentry
, struct kstat
*stat
)
3496 struct inode
*inode
= d_inode(dentry
);
3497 struct task_struct
*p
= get_proc_task(inode
);
3498 generic_fillattr(inode
, stat
);
3501 stat
->nlink
+= get_nr_threads(p
);
3508 static const struct inode_operations proc_task_inode_operations
= {
3509 .lookup
= proc_task_lookup
,
3510 .getattr
= proc_task_getattr
,
3511 .setattr
= proc_setattr
,
3512 .permission
= proc_pid_permission
,
3515 static const struct file_operations proc_task_operations
= {
3516 .read
= generic_read_dir
,
3517 .iterate_shared
= proc_task_readdir
,
3518 .llseek
= generic_file_llseek
,