4 * Copyright (C) 1991, 1992 Linus Torvalds
6 * proc base directory handling functions
8 * 1999, Al Viro. Rewritten. Now it covers the whole per-process part.
9 * Instead of using magical inumbers to determine the kind of object
10 * we allocate and fill in-core inodes upon lookup. They don't even
11 * go into icache. We cache the reference to task_struct upon lookup too.
12 * Eventually it should become a filesystem in its own. We don't use the
13 * rest of procfs anymore.
19 * Bruna Moreira <bruna.moreira@indt.org.br>
20 * Edjard Mota <edjard.mota@indt.org.br>
21 * Ilias Biris <ilias.biris@indt.org.br>
22 * Mauricio Lin <mauricio.lin@indt.org.br>
24 * Embedded Linux Lab - 10LE Instituto Nokia de Tecnologia - INdT
26 * A new process specific entry (smaps) included in /proc. It shows the
27 * size of rss for each memory area. The maps entry lacks information
28 * about physical memory size (rss) for each mapped file, i.e.,
29 * rss information for executables and library files.
30 * This additional information is useful for any tools that need to know
31 * about physical memory consumption for a process specific library.
35 * Embedded Linux Lab - 10LE Instituto Nokia de Tecnologia - INdT
36 * Pud inclusion in the page table walking.
40 * 10LE Instituto Nokia de Tecnologia - INdT:
41 * A better way to walks through the page table as suggested by Hugh Dickins.
43 * Simo Piiroinen <simo.piiroinen@nokia.com>:
44 * Smaps information related to shared, private, clean and dirty pages.
46 * Paul Mundt <paul.mundt@nokia.com>:
47 * Overall revision about smaps.
50 #include <linux/uaccess.h>
52 #include <linux/errno.h>
53 #include <linux/time.h>
54 #include <linux/proc_fs.h>
55 #include <linux/stat.h>
56 #include <linux/task_io_accounting_ops.h>
57 #include <linux/init.h>
58 #include <linux/capability.h>
59 #include <linux/file.h>
60 #include <linux/fdtable.h>
61 #include <linux/string.h>
62 #include <linux/seq_file.h>
63 #include <linux/namei.h>
64 #include <linux/mnt_namespace.h>
66 #include <linux/swap.h>
67 #include <linux/rcupdate.h>
68 #include <linux/kallsyms.h>
69 #include <linux/stacktrace.h>
70 #include <linux/resource.h>
71 #include <linux/module.h>
72 #include <linux/mount.h>
73 #include <linux/security.h>
74 #include <linux/ptrace.h>
75 #include <linux/tracehook.h>
76 #include <linux/printk.h>
77 #include <linux/cgroup.h>
78 #include <linux/cpuset.h>
79 #include <linux/audit.h>
80 #include <linux/poll.h>
81 #include <linux/nsproxy.h>
82 #include <linux/oom.h>
83 #include <linux/elf.h>
84 #include <linux/pid_namespace.h>
85 #include <linux/user_namespace.h>
86 #include <linux/fs_struct.h>
87 #include <linux/slab.h>
88 #include <linux/sched/autogroup.h>
89 #include <linux/flex_array.h>
90 #include <linux/posix-timers.h>
91 #ifdef CONFIG_HARDWALL
92 #include <asm/hardwall.h>
94 #include <trace/events/oom.h>
99 * Implementing inode permission operations in /proc is almost
100 * certainly an error. Permission checks need to happen during
101 * each system call not at open time. The reason is that most of
102 * what we wish to check for permissions in /proc varies at runtime.
104 * The classic example of a problem is opening file descriptors
105 * in /proc for a task before it execs a suid executable.
109 static u8 nlink_tgid
;
115 const struct inode_operations
*iop
;
116 const struct file_operations
*fop
;
120 #define NOD(NAME, MODE, IOP, FOP, OP) { \
122 .len = sizeof(NAME) - 1, \
129 #define DIR(NAME, MODE, iops, fops) \
130 NOD(NAME, (S_IFDIR|(MODE)), &iops, &fops, {} )
131 #define LNK(NAME, get_link) \
132 NOD(NAME, (S_IFLNK|S_IRWXUGO), \
133 &proc_pid_link_inode_operations, NULL, \
134 { .proc_get_link = get_link } )
135 #define REG(NAME, MODE, fops) \
136 NOD(NAME, (S_IFREG|(MODE)), NULL, &fops, {})
137 #define ONE(NAME, MODE, show) \
138 NOD(NAME, (S_IFREG|(MODE)), \
139 NULL, &proc_single_file_operations, \
140 { .proc_show = show } )
143 * Count the number of hardlinks for the pid_entry table, excluding the .
146 static unsigned int __init
pid_entry_nlink(const struct pid_entry
*entries
,
153 for (i
= 0; i
< n
; ++i
) {
154 if (S_ISDIR(entries
[i
].mode
))
161 static int get_task_root(struct task_struct
*task
, struct path
*root
)
163 int result
= -ENOENT
;
167 get_fs_root(task
->fs
, root
);
174 static int proc_cwd_link(struct dentry
*dentry
, struct path
*path
)
176 struct task_struct
*task
= get_proc_task(d_inode(dentry
));
177 int result
= -ENOENT
;
182 get_fs_pwd(task
->fs
, path
);
186 put_task_struct(task
);
191 static int proc_root_link(struct dentry
*dentry
, struct path
*path
)
193 struct task_struct
*task
= get_proc_task(d_inode(dentry
));
194 int result
= -ENOENT
;
197 result
= get_task_root(task
, path
);
198 put_task_struct(task
);
203 static ssize_t
proc_pid_cmdline_read(struct file
*file
, char __user
*buf
,
204 size_t _count
, loff_t
*pos
)
206 struct task_struct
*tsk
;
207 struct mm_struct
*mm
;
209 unsigned long count
= _count
;
210 unsigned long arg_start
, arg_end
, env_start
, env_end
;
211 unsigned long len1
, len2
, len
;
218 tsk
= get_proc_task(file_inode(file
));
221 mm
= get_task_mm(tsk
);
222 put_task_struct(tsk
);
225 /* Check if process spawned far enough to have cmdline. */
231 page
= (char *)__get_free_page(GFP_TEMPORARY
);
237 down_read(&mm
->mmap_sem
);
238 arg_start
= mm
->arg_start
;
239 arg_end
= mm
->arg_end
;
240 env_start
= mm
->env_start
;
241 env_end
= mm
->env_end
;
242 up_read(&mm
->mmap_sem
);
244 BUG_ON(arg_start
> arg_end
);
245 BUG_ON(env_start
> env_end
);
247 len1
= arg_end
- arg_start
;
248 len2
= env_end
- env_start
;
256 * Inherently racy -- command line shares address space
257 * with code and data.
259 rv
= access_remote_vm(mm
, arg_end
- 1, &c
, 1, 0);
266 /* Command line (set of strings) occupies whole ARGV. */
270 p
= arg_start
+ *pos
;
272 while (count
> 0 && len
> 0) {
276 _count
= min3(count
, len
, PAGE_SIZE
);
277 nr_read
= access_remote_vm(mm
, p
, page
, _count
, 0);
283 if (copy_to_user(buf
, page
, nr_read
)) {
296 * Command line (1 string) occupies ARGV and
303 { .p
= arg_start
, .len
= len1
},
304 { .p
= env_start
, .len
= len2
},
310 while (i
< 2 && pos1
>= cmdline
[i
].len
) {
311 pos1
-= cmdline
[i
].len
;
315 p
= cmdline
[i
].p
+ pos1
;
316 len
= cmdline
[i
].len
- pos1
;
317 while (count
> 0 && len
> 0) {
318 unsigned int _count
, l
;
322 _count
= min3(count
, len
, PAGE_SIZE
);
323 nr_read
= access_remote_vm(mm
, p
, page
, _count
, 0);
330 * Command line can be shorter than whole ARGV
331 * even if last "marker" byte says it is not.
334 l
= strnlen(page
, nr_read
);
340 if (copy_to_user(buf
, page
, nr_read
)) {
355 /* Only first chunk can be read partially. */
362 free_page((unsigned long)page
);
370 static const struct file_operations proc_pid_cmdline_ops
= {
371 .read
= proc_pid_cmdline_read
,
372 .llseek
= generic_file_llseek
,
375 #ifdef CONFIG_KALLSYMS
377 * Provides a wchan file via kallsyms in a proper one-value-per-file format.
378 * Returns the resolved symbol. If that fails, simply return the address.
380 static int proc_pid_wchan(struct seq_file
*m
, struct pid_namespace
*ns
,
381 struct pid
*pid
, struct task_struct
*task
)
384 char symname
[KSYM_NAME_LEN
];
386 wchan
= get_wchan(task
);
388 if (wchan
&& ptrace_may_access(task
, PTRACE_MODE_READ_FSCREDS
)
389 && !lookup_symbol_name(wchan
, symname
))
390 seq_printf(m
, "%s", symname
);
396 #endif /* CONFIG_KALLSYMS */
398 static int lock_trace(struct task_struct
*task
)
400 int err
= mutex_lock_killable(&task
->signal
->cred_guard_mutex
);
403 if (!ptrace_may_access(task
, PTRACE_MODE_ATTACH_FSCREDS
)) {
404 mutex_unlock(&task
->signal
->cred_guard_mutex
);
410 static void unlock_trace(struct task_struct
*task
)
412 mutex_unlock(&task
->signal
->cred_guard_mutex
);
415 #ifdef CONFIG_STACKTRACE
417 #define MAX_STACK_TRACE_DEPTH 64
419 static int proc_pid_stack(struct seq_file
*m
, struct pid_namespace
*ns
,
420 struct pid
*pid
, struct task_struct
*task
)
422 struct stack_trace trace
;
423 unsigned long *entries
;
427 entries
= kmalloc(MAX_STACK_TRACE_DEPTH
* sizeof(*entries
), GFP_KERNEL
);
431 trace
.nr_entries
= 0;
432 trace
.max_entries
= MAX_STACK_TRACE_DEPTH
;
433 trace
.entries
= entries
;
436 err
= lock_trace(task
);
438 save_stack_trace_tsk(task
, &trace
);
440 for (i
= 0; i
< trace
.nr_entries
; i
++) {
441 seq_printf(m
, "[<%pK>] %pB\n",
442 (void *)entries
[i
], (void *)entries
[i
]);
452 #ifdef CONFIG_SCHED_INFO
454 * Provides /proc/PID/schedstat
456 static int proc_pid_schedstat(struct seq_file
*m
, struct pid_namespace
*ns
,
457 struct pid
*pid
, struct task_struct
*task
)
459 if (unlikely(!sched_info_on()))
460 seq_printf(m
, "0 0 0\n");
462 seq_printf(m
, "%llu %llu %lu\n",
463 (unsigned long long)task
->se
.sum_exec_runtime
,
464 (unsigned long long)task
->sched_info
.run_delay
,
465 task
->sched_info
.pcount
);
471 #ifdef CONFIG_LATENCYTOP
472 static int lstats_show_proc(struct seq_file
*m
, void *v
)
475 struct inode
*inode
= m
->private;
476 struct task_struct
*task
= get_proc_task(inode
);
480 seq_puts(m
, "Latency Top version : v0.1\n");
481 for (i
= 0; i
< 32; i
++) {
482 struct latency_record
*lr
= &task
->latency_record
[i
];
483 if (lr
->backtrace
[0]) {
485 seq_printf(m
, "%i %li %li",
486 lr
->count
, lr
->time
, lr
->max
);
487 for (q
= 0; q
< LT_BACKTRACEDEPTH
; q
++) {
488 unsigned long bt
= lr
->backtrace
[q
];
493 seq_printf(m
, " %ps", (void *)bt
);
499 put_task_struct(task
);
503 static int lstats_open(struct inode
*inode
, struct file
*file
)
505 return single_open(file
, lstats_show_proc
, inode
);
508 static ssize_t
lstats_write(struct file
*file
, const char __user
*buf
,
509 size_t count
, loff_t
*offs
)
511 struct task_struct
*task
= get_proc_task(file_inode(file
));
515 clear_all_latency_tracing(task
);
516 put_task_struct(task
);
521 static const struct file_operations proc_lstats_operations
= {
524 .write
= lstats_write
,
526 .release
= single_release
,
531 static int proc_oom_score(struct seq_file
*m
, struct pid_namespace
*ns
,
532 struct pid
*pid
, struct task_struct
*task
)
534 unsigned long totalpages
= totalram_pages
+ total_swap_pages
;
535 unsigned long points
= 0;
537 points
= oom_badness(task
, NULL
, NULL
, totalpages
) *
539 seq_printf(m
, "%lu\n", points
);
549 static const struct limit_names lnames
[RLIM_NLIMITS
] = {
550 [RLIMIT_CPU
] = {"Max cpu time", "seconds"},
551 [RLIMIT_FSIZE
] = {"Max file size", "bytes"},
552 [RLIMIT_DATA
] = {"Max data size", "bytes"},
553 [RLIMIT_STACK
] = {"Max stack size", "bytes"},
554 [RLIMIT_CORE
] = {"Max core file size", "bytes"},
555 [RLIMIT_RSS
] = {"Max resident set", "bytes"},
556 [RLIMIT_NPROC
] = {"Max processes", "processes"},
557 [RLIMIT_NOFILE
] = {"Max open files", "files"},
558 [RLIMIT_MEMLOCK
] = {"Max locked memory", "bytes"},
559 [RLIMIT_AS
] = {"Max address space", "bytes"},
560 [RLIMIT_LOCKS
] = {"Max file locks", "locks"},
561 [RLIMIT_SIGPENDING
] = {"Max pending signals", "signals"},
562 [RLIMIT_MSGQUEUE
] = {"Max msgqueue size", "bytes"},
563 [RLIMIT_NICE
] = {"Max nice priority", NULL
},
564 [RLIMIT_RTPRIO
] = {"Max realtime priority", NULL
},
565 [RLIMIT_RTTIME
] = {"Max realtime timeout", "us"},
568 /* Display limits for a process */
569 static int proc_pid_limits(struct seq_file
*m
, struct pid_namespace
*ns
,
570 struct pid
*pid
, struct task_struct
*task
)
575 struct rlimit rlim
[RLIM_NLIMITS
];
577 if (!lock_task_sighand(task
, &flags
))
579 memcpy(rlim
, task
->signal
->rlim
, sizeof(struct rlimit
) * RLIM_NLIMITS
);
580 unlock_task_sighand(task
, &flags
);
583 * print the file header
585 seq_printf(m
, "%-25s %-20s %-20s %-10s\n",
586 "Limit", "Soft Limit", "Hard Limit", "Units");
588 for (i
= 0; i
< RLIM_NLIMITS
; i
++) {
589 if (rlim
[i
].rlim_cur
== RLIM_INFINITY
)
590 seq_printf(m
, "%-25s %-20s ",
591 lnames
[i
].name
, "unlimited");
593 seq_printf(m
, "%-25s %-20lu ",
594 lnames
[i
].name
, rlim
[i
].rlim_cur
);
596 if (rlim
[i
].rlim_max
== RLIM_INFINITY
)
597 seq_printf(m
, "%-20s ", "unlimited");
599 seq_printf(m
, "%-20lu ", rlim
[i
].rlim_max
);
602 seq_printf(m
, "%-10s\n", lnames
[i
].unit
);
610 #ifdef CONFIG_HAVE_ARCH_TRACEHOOK
611 static int proc_pid_syscall(struct seq_file
*m
, struct pid_namespace
*ns
,
612 struct pid
*pid
, struct task_struct
*task
)
615 unsigned long args
[6], sp
, pc
;
618 res
= lock_trace(task
);
622 if (task_current_syscall(task
, &nr
, args
, 6, &sp
, &pc
))
623 seq_puts(m
, "running\n");
625 seq_printf(m
, "%ld 0x%lx 0x%lx\n", nr
, sp
, pc
);
628 "%ld 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx\n",
630 args
[0], args
[1], args
[2], args
[3], args
[4], args
[5],
636 #endif /* CONFIG_HAVE_ARCH_TRACEHOOK */
638 /************************************************************************/
639 /* Here the fs part begins */
640 /************************************************************************/
642 /* permission checks */
643 static int proc_fd_access_allowed(struct inode
*inode
)
645 struct task_struct
*task
;
647 /* Allow access to a task's file descriptors if it is us or we
648 * may use ptrace attach to the process and find out that
651 task
= get_proc_task(inode
);
653 allowed
= ptrace_may_access(task
, PTRACE_MODE_READ_FSCREDS
);
654 put_task_struct(task
);
659 int proc_setattr(struct dentry
*dentry
, struct iattr
*attr
)
662 struct inode
*inode
= d_inode(dentry
);
664 if (attr
->ia_valid
& ATTR_MODE
)
667 error
= setattr_prepare(dentry
, attr
);
671 setattr_copy(inode
, attr
);
672 mark_inode_dirty(inode
);
677 * May current process learn task's sched/cmdline info (for hide_pid_min=1)
678 * or euid/egid (for hide_pid_min=2)?
680 static bool has_pid_permissions(struct pid_namespace
*pid
,
681 struct task_struct
*task
,
684 if (pid
->hide_pid
< hide_pid_min
)
686 if (in_group_p(pid
->pid_gid
))
688 return ptrace_may_access(task
, PTRACE_MODE_READ_FSCREDS
);
692 static int proc_pid_permission(struct inode
*inode
, int mask
)
694 struct pid_namespace
*pid
= inode
->i_sb
->s_fs_info
;
695 struct task_struct
*task
;
698 task
= get_proc_task(inode
);
701 has_perms
= has_pid_permissions(pid
, task
, HIDEPID_NO_ACCESS
);
702 put_task_struct(task
);
705 if (pid
->hide_pid
== HIDEPID_INVISIBLE
) {
707 * Let's make getdents(), stat(), and open()
708 * consistent with each other. If a process
709 * may not stat() a file, it shouldn't be seen
717 return generic_permission(inode
, mask
);
722 static const struct inode_operations proc_def_inode_operations
= {
723 .setattr
= proc_setattr
,
726 static int proc_single_show(struct seq_file
*m
, void *v
)
728 struct inode
*inode
= m
->private;
729 struct pid_namespace
*ns
;
731 struct task_struct
*task
;
734 ns
= inode
->i_sb
->s_fs_info
;
735 pid
= proc_pid(inode
);
736 task
= get_pid_task(pid
, PIDTYPE_PID
);
740 ret
= PROC_I(inode
)->op
.proc_show(m
, ns
, pid
, task
);
742 put_task_struct(task
);
746 static int proc_single_open(struct inode
*inode
, struct file
*filp
)
748 return single_open(filp
, proc_single_show
, inode
);
751 static const struct file_operations proc_single_file_operations
= {
752 .open
= proc_single_open
,
755 .release
= single_release
,
759 struct mm_struct
*proc_mem_open(struct inode
*inode
, unsigned int mode
)
761 struct task_struct
*task
= get_proc_task(inode
);
762 struct mm_struct
*mm
= ERR_PTR(-ESRCH
);
765 mm
= mm_access(task
, mode
| PTRACE_MODE_FSCREDS
);
766 put_task_struct(task
);
768 if (!IS_ERR_OR_NULL(mm
)) {
769 /* ensure this mm_struct can't be freed */
771 /* but do not pin its memory */
779 static int __mem_open(struct inode
*inode
, struct file
*file
, unsigned int mode
)
781 struct mm_struct
*mm
= proc_mem_open(inode
, mode
);
786 file
->private_data
= mm
;
790 static int mem_open(struct inode
*inode
, struct file
*file
)
792 int ret
= __mem_open(inode
, file
, PTRACE_MODE_ATTACH
);
794 /* OK to pass negative loff_t, we can catch out-of-range */
795 file
->f_mode
|= FMODE_UNSIGNED_OFFSET
;
800 static ssize_t
mem_rw(struct file
*file
, char __user
*buf
,
801 size_t count
, loff_t
*ppos
, int write
)
803 struct mm_struct
*mm
= file
->private_data
;
804 unsigned long addr
= *ppos
;
812 page
= (char *)__get_free_page(GFP_TEMPORARY
);
817 if (!mmget_not_zero(mm
))
820 /* Maybe we should limit FOLL_FORCE to actual ptrace users? */
826 int this_len
= min_t(int, count
, PAGE_SIZE
);
828 if (write
&& copy_from_user(page
, buf
, this_len
)) {
833 this_len
= access_remote_vm(mm
, addr
, page
, this_len
, flags
);
840 if (!write
&& copy_to_user(buf
, page
, this_len
)) {
854 free_page((unsigned long) page
);
858 static ssize_t
mem_read(struct file
*file
, char __user
*buf
,
859 size_t count
, loff_t
*ppos
)
861 return mem_rw(file
, buf
, count
, ppos
, 0);
864 static ssize_t
mem_write(struct file
*file
, const char __user
*buf
,
865 size_t count
, loff_t
*ppos
)
867 return mem_rw(file
, (char __user
*)buf
, count
, ppos
, 1);
870 loff_t
mem_lseek(struct file
*file
, loff_t offset
, int orig
)
874 file
->f_pos
= offset
;
877 file
->f_pos
+= offset
;
882 force_successful_syscall_return();
886 static int mem_release(struct inode
*inode
, struct file
*file
)
888 struct mm_struct
*mm
= file
->private_data
;
894 static const struct file_operations proc_mem_operations
= {
899 .release
= mem_release
,
902 static int environ_open(struct inode
*inode
, struct file
*file
)
904 return __mem_open(inode
, file
, PTRACE_MODE_READ
);
907 static ssize_t
environ_read(struct file
*file
, char __user
*buf
,
908 size_t count
, loff_t
*ppos
)
911 unsigned long src
= *ppos
;
913 struct mm_struct
*mm
= file
->private_data
;
914 unsigned long env_start
, env_end
;
916 /* Ensure the process spawned far enough to have an environment. */
917 if (!mm
|| !mm
->env_end
)
920 page
= (char *)__get_free_page(GFP_TEMPORARY
);
925 if (!mmget_not_zero(mm
))
928 down_read(&mm
->mmap_sem
);
929 env_start
= mm
->env_start
;
930 env_end
= mm
->env_end
;
931 up_read(&mm
->mmap_sem
);
934 size_t this_len
, max_len
;
937 if (src
>= (env_end
- env_start
))
940 this_len
= env_end
- (env_start
+ src
);
942 max_len
= min_t(size_t, PAGE_SIZE
, count
);
943 this_len
= min(max_len
, this_len
);
945 retval
= access_remote_vm(mm
, (env_start
+ src
), page
, this_len
, 0);
952 if (copy_to_user(buf
, page
, retval
)) {
966 free_page((unsigned long) page
);
970 static const struct file_operations proc_environ_operations
= {
971 .open
= environ_open
,
972 .read
= environ_read
,
973 .llseek
= generic_file_llseek
,
974 .release
= mem_release
,
977 static int auxv_open(struct inode
*inode
, struct file
*file
)
979 return __mem_open(inode
, file
, PTRACE_MODE_READ_FSCREDS
);
982 static ssize_t
auxv_read(struct file
*file
, char __user
*buf
,
983 size_t count
, loff_t
*ppos
)
985 struct mm_struct
*mm
= file
->private_data
;
986 unsigned int nwords
= 0;
992 } while (mm
->saved_auxv
[nwords
- 2] != 0); /* AT_NULL */
993 return simple_read_from_buffer(buf
, count
, ppos
, mm
->saved_auxv
,
994 nwords
* sizeof(mm
->saved_auxv
[0]));
997 static const struct file_operations proc_auxv_operations
= {
1000 .llseek
= generic_file_llseek
,
1001 .release
= mem_release
,
1004 static ssize_t
oom_adj_read(struct file
*file
, char __user
*buf
, size_t count
,
1007 struct task_struct
*task
= get_proc_task(file_inode(file
));
1008 char buffer
[PROC_NUMBUF
];
1009 int oom_adj
= OOM_ADJUST_MIN
;
1014 if (task
->signal
->oom_score_adj
== OOM_SCORE_ADJ_MAX
)
1015 oom_adj
= OOM_ADJUST_MAX
;
1017 oom_adj
= (task
->signal
->oom_score_adj
* -OOM_DISABLE
) /
1019 put_task_struct(task
);
1020 len
= snprintf(buffer
, sizeof(buffer
), "%d\n", oom_adj
);
1021 return simple_read_from_buffer(buf
, count
, ppos
, buffer
, len
);
1024 static int __set_oom_adj(struct file
*file
, int oom_adj
, bool legacy
)
1026 static DEFINE_MUTEX(oom_adj_mutex
);
1027 struct mm_struct
*mm
= NULL
;
1028 struct task_struct
*task
;
1031 task
= get_proc_task(file_inode(file
));
1035 mutex_lock(&oom_adj_mutex
);
1037 if (oom_adj
< task
->signal
->oom_score_adj
&&
1038 !capable(CAP_SYS_RESOURCE
)) {
1043 * /proc/pid/oom_adj is provided for legacy purposes, ask users to use
1044 * /proc/pid/oom_score_adj instead.
1046 pr_warn_once("%s (%d): /proc/%d/oom_adj is deprecated, please use /proc/%d/oom_score_adj instead.\n",
1047 current
->comm
, task_pid_nr(current
), task_pid_nr(task
),
1050 if ((short)oom_adj
< task
->signal
->oom_score_adj_min
&&
1051 !capable(CAP_SYS_RESOURCE
)) {
1058 * Make sure we will check other processes sharing the mm if this is
1059 * not vfrok which wants its own oom_score_adj.
1060 * pin the mm so it doesn't go away and get reused after task_unlock
1062 if (!task
->vfork_done
) {
1063 struct task_struct
*p
= find_lock_task_mm(task
);
1066 if (atomic_read(&p
->mm
->mm_users
) > 1) {
1074 task
->signal
->oom_score_adj
= oom_adj
;
1075 if (!legacy
&& has_capability_noaudit(current
, CAP_SYS_RESOURCE
))
1076 task
->signal
->oom_score_adj_min
= (short)oom_adj
;
1077 trace_oom_score_adj_update(task
);
1080 struct task_struct
*p
;
1083 for_each_process(p
) {
1084 if (same_thread_group(task
, p
))
1087 /* do not touch kernel threads or the global init */
1088 if (p
->flags
& PF_KTHREAD
|| is_global_init(p
))
1092 if (!p
->vfork_done
&& process_shares_mm(p
, mm
)) {
1093 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",
1094 task_pid_nr(p
), p
->comm
,
1095 p
->signal
->oom_score_adj
, oom_adj
,
1096 task_pid_nr(task
), task
->comm
);
1097 p
->signal
->oom_score_adj
= oom_adj
;
1098 if (!legacy
&& has_capability_noaudit(current
, CAP_SYS_RESOURCE
))
1099 p
->signal
->oom_score_adj_min
= (short)oom_adj
;
1107 mutex_unlock(&oom_adj_mutex
);
1108 put_task_struct(task
);
1113 * /proc/pid/oom_adj exists solely for backwards compatibility with previous
1114 * kernels. The effective policy is defined by oom_score_adj, which has a
1115 * different scale: oom_adj grew exponentially and oom_score_adj grows linearly.
1116 * Values written to oom_adj are simply mapped linearly to oom_score_adj.
1117 * Processes that become oom disabled via oom_adj will still be oom disabled
1118 * with this implementation.
1120 * oom_adj cannot be removed since existing userspace binaries use it.
1122 static ssize_t
oom_adj_write(struct file
*file
, const char __user
*buf
,
1123 size_t count
, loff_t
*ppos
)
1125 char buffer
[PROC_NUMBUF
];
1129 memset(buffer
, 0, sizeof(buffer
));
1130 if (count
> sizeof(buffer
) - 1)
1131 count
= sizeof(buffer
) - 1;
1132 if (copy_from_user(buffer
, buf
, count
)) {
1137 err
= kstrtoint(strstrip(buffer
), 0, &oom_adj
);
1140 if ((oom_adj
< OOM_ADJUST_MIN
|| oom_adj
> OOM_ADJUST_MAX
) &&
1141 oom_adj
!= OOM_DISABLE
) {
1147 * Scale /proc/pid/oom_score_adj appropriately ensuring that a maximum
1148 * value is always attainable.
1150 if (oom_adj
== OOM_ADJUST_MAX
)
1151 oom_adj
= OOM_SCORE_ADJ_MAX
;
1153 oom_adj
= (oom_adj
* OOM_SCORE_ADJ_MAX
) / -OOM_DISABLE
;
1155 err
= __set_oom_adj(file
, oom_adj
, true);
1157 return err
< 0 ? err
: count
;
1160 static const struct file_operations proc_oom_adj_operations
= {
1161 .read
= oom_adj_read
,
1162 .write
= oom_adj_write
,
1163 .llseek
= generic_file_llseek
,
1166 static ssize_t
oom_score_adj_read(struct file
*file
, char __user
*buf
,
1167 size_t count
, loff_t
*ppos
)
1169 struct task_struct
*task
= get_proc_task(file_inode(file
));
1170 char buffer
[PROC_NUMBUF
];
1171 short oom_score_adj
= OOM_SCORE_ADJ_MIN
;
1176 oom_score_adj
= task
->signal
->oom_score_adj
;
1177 put_task_struct(task
);
1178 len
= snprintf(buffer
, sizeof(buffer
), "%hd\n", oom_score_adj
);
1179 return simple_read_from_buffer(buf
, count
, ppos
, buffer
, len
);
1182 static ssize_t
oom_score_adj_write(struct file
*file
, const char __user
*buf
,
1183 size_t count
, loff_t
*ppos
)
1185 char buffer
[PROC_NUMBUF
];
1189 memset(buffer
, 0, sizeof(buffer
));
1190 if (count
> sizeof(buffer
) - 1)
1191 count
= sizeof(buffer
) - 1;
1192 if (copy_from_user(buffer
, buf
, count
)) {
1197 err
= kstrtoint(strstrip(buffer
), 0, &oom_score_adj
);
1200 if (oom_score_adj
< OOM_SCORE_ADJ_MIN
||
1201 oom_score_adj
> OOM_SCORE_ADJ_MAX
) {
1206 err
= __set_oom_adj(file
, oom_score_adj
, false);
1208 return err
< 0 ? err
: count
;
1211 static const struct file_operations proc_oom_score_adj_operations
= {
1212 .read
= oom_score_adj_read
,
1213 .write
= oom_score_adj_write
,
1214 .llseek
= default_llseek
,
1217 #ifdef CONFIG_AUDITSYSCALL
1218 #define TMPBUFLEN 11
1219 static ssize_t
proc_loginuid_read(struct file
* file
, char __user
* buf
,
1220 size_t count
, loff_t
*ppos
)
1222 struct inode
* inode
= file_inode(file
);
1223 struct task_struct
*task
= get_proc_task(inode
);
1225 char tmpbuf
[TMPBUFLEN
];
1229 length
= scnprintf(tmpbuf
, TMPBUFLEN
, "%u",
1230 from_kuid(file
->f_cred
->user_ns
,
1231 audit_get_loginuid(task
)));
1232 put_task_struct(task
);
1233 return simple_read_from_buffer(buf
, count
, ppos
, tmpbuf
, length
);
1236 static ssize_t
proc_loginuid_write(struct file
* file
, const char __user
* buf
,
1237 size_t count
, loff_t
*ppos
)
1239 struct inode
* inode
= file_inode(file
);
1245 if (current
!= pid_task(proc_pid(inode
), PIDTYPE_PID
)) {
1252 /* No partial writes. */
1256 rv
= kstrtou32_from_user(buf
, count
, 10, &loginuid
);
1260 /* is userspace tring to explicitly UNSET the loginuid? */
1261 if (loginuid
== AUDIT_UID_UNSET
) {
1262 kloginuid
= INVALID_UID
;
1264 kloginuid
= make_kuid(file
->f_cred
->user_ns
, loginuid
);
1265 if (!uid_valid(kloginuid
))
1269 rv
= audit_set_loginuid(kloginuid
);
1275 static const struct file_operations proc_loginuid_operations
= {
1276 .read
= proc_loginuid_read
,
1277 .write
= proc_loginuid_write
,
1278 .llseek
= generic_file_llseek
,
1281 static ssize_t
proc_sessionid_read(struct file
* file
, char __user
* buf
,
1282 size_t count
, loff_t
*ppos
)
1284 struct inode
* inode
= file_inode(file
);
1285 struct task_struct
*task
= get_proc_task(inode
);
1287 char tmpbuf
[TMPBUFLEN
];
1291 length
= scnprintf(tmpbuf
, TMPBUFLEN
, "%u",
1292 audit_get_sessionid(task
));
1293 put_task_struct(task
);
1294 return simple_read_from_buffer(buf
, count
, ppos
, tmpbuf
, length
);
1297 static const struct file_operations proc_sessionid_operations
= {
1298 .read
= proc_sessionid_read
,
1299 .llseek
= generic_file_llseek
,
1303 #ifdef CONFIG_FAULT_INJECTION
1304 static ssize_t
proc_fault_inject_read(struct file
* file
, char __user
* buf
,
1305 size_t count
, loff_t
*ppos
)
1307 struct task_struct
*task
= get_proc_task(file_inode(file
));
1308 char buffer
[PROC_NUMBUF
];
1314 make_it_fail
= task
->make_it_fail
;
1315 put_task_struct(task
);
1317 len
= snprintf(buffer
, sizeof(buffer
), "%i\n", make_it_fail
);
1319 return simple_read_from_buffer(buf
, count
, ppos
, buffer
, len
);
1322 static ssize_t
proc_fault_inject_write(struct file
* file
,
1323 const char __user
* buf
, size_t count
, loff_t
*ppos
)
1325 struct task_struct
*task
;
1326 char buffer
[PROC_NUMBUF
];
1330 if (!capable(CAP_SYS_RESOURCE
))
1332 memset(buffer
, 0, sizeof(buffer
));
1333 if (count
> sizeof(buffer
) - 1)
1334 count
= sizeof(buffer
) - 1;
1335 if (copy_from_user(buffer
, buf
, count
))
1337 rv
= kstrtoint(strstrip(buffer
), 0, &make_it_fail
);
1340 if (make_it_fail
< 0 || make_it_fail
> 1)
1343 task
= get_proc_task(file_inode(file
));
1346 task
->make_it_fail
= make_it_fail
;
1347 put_task_struct(task
);
1352 static const struct file_operations proc_fault_inject_operations
= {
1353 .read
= proc_fault_inject_read
,
1354 .write
= proc_fault_inject_write
,
1355 .llseek
= generic_file_llseek
,
1360 #ifdef CONFIG_SCHED_DEBUG
1362 * Print out various scheduling related per-task fields:
1364 static int sched_show(struct seq_file
*m
, void *v
)
1366 struct inode
*inode
= m
->private;
1367 struct task_struct
*p
;
1369 p
= get_proc_task(inode
);
1372 proc_sched_show_task(p
, m
);
1380 sched_write(struct file
*file
, const char __user
*buf
,
1381 size_t count
, loff_t
*offset
)
1383 struct inode
*inode
= file_inode(file
);
1384 struct task_struct
*p
;
1386 p
= get_proc_task(inode
);
1389 proc_sched_set_task(p
);
1396 static int sched_open(struct inode
*inode
, struct file
*filp
)
1398 return single_open(filp
, sched_show
, inode
);
1401 static const struct file_operations proc_pid_sched_operations
= {
1404 .write
= sched_write
,
1405 .llseek
= seq_lseek
,
1406 .release
= single_release
,
1411 #ifdef CONFIG_SCHED_AUTOGROUP
1413 * Print out autogroup related information:
1415 static int sched_autogroup_show(struct seq_file
*m
, void *v
)
1417 struct inode
*inode
= m
->private;
1418 struct task_struct
*p
;
1420 p
= get_proc_task(inode
);
1423 proc_sched_autogroup_show_task(p
, m
);
1431 sched_autogroup_write(struct file
*file
, const char __user
*buf
,
1432 size_t count
, loff_t
*offset
)
1434 struct inode
*inode
= file_inode(file
);
1435 struct task_struct
*p
;
1436 char buffer
[PROC_NUMBUF
];
1440 memset(buffer
, 0, sizeof(buffer
));
1441 if (count
> sizeof(buffer
) - 1)
1442 count
= sizeof(buffer
) - 1;
1443 if (copy_from_user(buffer
, buf
, count
))
1446 err
= kstrtoint(strstrip(buffer
), 0, &nice
);
1450 p
= get_proc_task(inode
);
1454 err
= proc_sched_autogroup_set_nice(p
, nice
);
1463 static int sched_autogroup_open(struct inode
*inode
, struct file
*filp
)
1467 ret
= single_open(filp
, sched_autogroup_show
, NULL
);
1469 struct seq_file
*m
= filp
->private_data
;
1476 static const struct file_operations proc_pid_sched_autogroup_operations
= {
1477 .open
= sched_autogroup_open
,
1479 .write
= sched_autogroup_write
,
1480 .llseek
= seq_lseek
,
1481 .release
= single_release
,
1484 #endif /* CONFIG_SCHED_AUTOGROUP */
1486 static ssize_t
comm_write(struct file
*file
, const char __user
*buf
,
1487 size_t count
, loff_t
*offset
)
1489 struct inode
*inode
= file_inode(file
);
1490 struct task_struct
*p
;
1491 char buffer
[TASK_COMM_LEN
];
1492 const size_t maxlen
= sizeof(buffer
) - 1;
1494 memset(buffer
, 0, sizeof(buffer
));
1495 if (copy_from_user(buffer
, buf
, count
> maxlen
? maxlen
: count
))
1498 p
= get_proc_task(inode
);
1502 if (same_thread_group(current
, p
))
1503 set_task_comm(p
, buffer
);
1512 static int comm_show(struct seq_file
*m
, void *v
)
1514 struct inode
*inode
= m
->private;
1515 struct task_struct
*p
;
1517 p
= get_proc_task(inode
);
1522 seq_printf(m
, "%s\n", p
->comm
);
1530 static int comm_open(struct inode
*inode
, struct file
*filp
)
1532 return single_open(filp
, comm_show
, inode
);
1535 static const struct file_operations proc_pid_set_comm_operations
= {
1538 .write
= comm_write
,
1539 .llseek
= seq_lseek
,
1540 .release
= single_release
,
1543 static int proc_exe_link(struct dentry
*dentry
, struct path
*exe_path
)
1545 struct task_struct
*task
;
1546 struct file
*exe_file
;
1548 task
= get_proc_task(d_inode(dentry
));
1551 exe_file
= get_task_exe_file(task
);
1552 put_task_struct(task
);
1554 *exe_path
= exe_file
->f_path
;
1555 path_get(&exe_file
->f_path
);
1562 static const char *proc_pid_get_link(struct dentry
*dentry
,
1563 struct inode
*inode
,
1564 struct delayed_call
*done
)
1567 int error
= -EACCES
;
1570 return ERR_PTR(-ECHILD
);
1572 /* Are we allowed to snoop on the tasks file descriptors? */
1573 if (!proc_fd_access_allowed(inode
))
1576 error
= PROC_I(inode
)->op
.proc_get_link(dentry
, &path
);
1580 nd_jump_link(&path
);
1583 return ERR_PTR(error
);
1586 static int do_proc_readlink(struct path
*path
, char __user
*buffer
, int buflen
)
1588 char *tmp
= (char*)__get_free_page(GFP_TEMPORARY
);
1595 pathname
= d_path(path
, tmp
, PAGE_SIZE
);
1596 len
= PTR_ERR(pathname
);
1597 if (IS_ERR(pathname
))
1599 len
= tmp
+ PAGE_SIZE
- 1 - pathname
;
1603 if (copy_to_user(buffer
, pathname
, len
))
1606 free_page((unsigned long)tmp
);
1610 static int proc_pid_readlink(struct dentry
* dentry
, char __user
* buffer
, int buflen
)
1612 int error
= -EACCES
;
1613 struct inode
*inode
= d_inode(dentry
);
1616 /* Are we allowed to snoop on the tasks file descriptors? */
1617 if (!proc_fd_access_allowed(inode
))
1620 error
= PROC_I(inode
)->op
.proc_get_link(dentry
, &path
);
1624 error
= do_proc_readlink(&path
, buffer
, buflen
);
1630 const struct inode_operations proc_pid_link_inode_operations
= {
1631 .readlink
= proc_pid_readlink
,
1632 .get_link
= proc_pid_get_link
,
1633 .setattr
= proc_setattr
,
1637 /* building an inode */
1639 void task_dump_owner(struct task_struct
*task
, mode_t mode
,
1640 kuid_t
*ruid
, kgid_t
*rgid
)
1642 /* Depending on the state of dumpable compute who should own a
1643 * proc file for a task.
1645 const struct cred
*cred
;
1649 /* Default to the tasks effective ownership */
1651 cred
= __task_cred(task
);
1657 * Before the /proc/pid/status file was created the only way to read
1658 * the effective uid of a /process was to stat /proc/pid. Reading
1659 * /proc/pid/status is slow enough that procps and other packages
1660 * kept stating /proc/pid. To keep the rules in /proc simple I have
1661 * made this apply to all per process world readable and executable
1664 if (mode
!= (S_IFDIR
|S_IRUGO
|S_IXUGO
)) {
1665 struct mm_struct
*mm
;
1668 /* Make non-dumpable tasks owned by some root */
1670 if (get_dumpable(mm
) != SUID_DUMP_USER
) {
1671 struct user_namespace
*user_ns
= mm
->user_ns
;
1673 uid
= make_kuid(user_ns
, 0);
1674 if (!uid_valid(uid
))
1675 uid
= GLOBAL_ROOT_UID
;
1677 gid
= make_kgid(user_ns
, 0);
1678 if (!gid_valid(gid
))
1679 gid
= GLOBAL_ROOT_GID
;
1682 uid
= GLOBAL_ROOT_UID
;
1683 gid
= GLOBAL_ROOT_GID
;
1691 struct inode
*proc_pid_make_inode(struct super_block
* sb
,
1692 struct task_struct
*task
, umode_t mode
)
1694 struct inode
* inode
;
1695 struct proc_inode
*ei
;
1697 /* We need a new inode */
1699 inode
= new_inode(sb
);
1705 inode
->i_mode
= mode
;
1706 inode
->i_ino
= get_next_ino();
1707 inode
->i_mtime
= inode
->i_atime
= inode
->i_ctime
= current_time(inode
);
1708 inode
->i_op
= &proc_def_inode_operations
;
1711 * grab the reference to task.
1713 ei
->pid
= get_task_pid(task
, PIDTYPE_PID
);
1717 task_dump_owner(task
, 0, &inode
->i_uid
, &inode
->i_gid
);
1718 security_task_to_inode(task
, inode
);
1728 int pid_getattr(struct vfsmount
*mnt
, struct dentry
*dentry
, struct kstat
*stat
)
1730 struct inode
*inode
= d_inode(dentry
);
1731 struct task_struct
*task
;
1732 struct pid_namespace
*pid
= dentry
->d_sb
->s_fs_info
;
1734 generic_fillattr(inode
, stat
);
1737 stat
->uid
= GLOBAL_ROOT_UID
;
1738 stat
->gid
= GLOBAL_ROOT_GID
;
1739 task
= pid_task(proc_pid(inode
), PIDTYPE_PID
);
1741 if (!has_pid_permissions(pid
, task
, HIDEPID_INVISIBLE
)) {
1744 * This doesn't prevent learning whether PID exists,
1745 * it only makes getattr() consistent with readdir().
1749 task_dump_owner(task
, inode
->i_mode
, &stat
->uid
, &stat
->gid
);
1758 * Exceptional case: normally we are not allowed to unhash a busy
1759 * directory. In this case, however, we can do it - no aliasing problems
1760 * due to the way we treat inodes.
1762 * Rewrite the inode's ownerships here because the owning task may have
1763 * performed a setuid(), etc.
1766 int pid_revalidate(struct dentry
*dentry
, unsigned int flags
)
1768 struct inode
*inode
;
1769 struct task_struct
*task
;
1771 if (flags
& LOOKUP_RCU
)
1774 inode
= d_inode(dentry
);
1775 task
= get_proc_task(inode
);
1778 task_dump_owner(task
, inode
->i_mode
, &inode
->i_uid
, &inode
->i_gid
);
1780 inode
->i_mode
&= ~(S_ISUID
| S_ISGID
);
1781 security_task_to_inode(task
, inode
);
1782 put_task_struct(task
);
1788 static inline bool proc_inode_is_dead(struct inode
*inode
)
1790 return !proc_pid(inode
)->tasks
[PIDTYPE_PID
].first
;
1793 int pid_delete_dentry(const struct dentry
*dentry
)
1795 /* Is the task we represent dead?
1796 * If so, then don't put the dentry on the lru list,
1797 * kill it immediately.
1799 return proc_inode_is_dead(d_inode(dentry
));
1802 const struct dentry_operations pid_dentry_operations
=
1804 .d_revalidate
= pid_revalidate
,
1805 .d_delete
= pid_delete_dentry
,
1811 * Fill a directory entry.
1813 * If possible create the dcache entry and derive our inode number and
1814 * file type from dcache entry.
1816 * Since all of the proc inode numbers are dynamically generated, the inode
1817 * numbers do not exist until the inode is cache. This means creating the
1818 * the dcache entry in readdir is necessary to keep the inode numbers
1819 * reported by readdir in sync with the inode numbers reported
1822 bool proc_fill_cache(struct file
*file
, struct dir_context
*ctx
,
1823 const char *name
, int len
,
1824 instantiate_t instantiate
, struct task_struct
*task
, const void *ptr
)
1826 struct dentry
*child
, *dir
= file
->f_path
.dentry
;
1827 struct qstr qname
= QSTR_INIT(name
, len
);
1828 struct inode
*inode
;
1832 child
= d_hash_and_lookup(dir
, &qname
);
1834 DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq
);
1835 child
= d_alloc_parallel(dir
, &qname
, &wq
);
1837 goto end_instantiate
;
1838 if (d_in_lookup(child
)) {
1839 int err
= instantiate(d_inode(dir
), child
, task
, ptr
);
1840 d_lookup_done(child
);
1843 goto end_instantiate
;
1847 inode
= d_inode(child
);
1849 type
= inode
->i_mode
>> 12;
1851 return dir_emit(ctx
, name
, len
, ino
, type
);
1854 return dir_emit(ctx
, name
, len
, 1, DT_UNKNOWN
);
1858 * dname_to_vma_addr - maps a dentry name into two unsigned longs
1859 * which represent vma start and end addresses.
1861 static int dname_to_vma_addr(struct dentry
*dentry
,
1862 unsigned long *start
, unsigned long *end
)
1864 if (sscanf(dentry
->d_name
.name
, "%lx-%lx", start
, end
) != 2)
1870 static int map_files_d_revalidate(struct dentry
*dentry
, unsigned int flags
)
1872 unsigned long vm_start
, vm_end
;
1873 bool exact_vma_exists
= false;
1874 struct mm_struct
*mm
= NULL
;
1875 struct task_struct
*task
;
1876 struct inode
*inode
;
1879 if (flags
& LOOKUP_RCU
)
1882 inode
= d_inode(dentry
);
1883 task
= get_proc_task(inode
);
1887 mm
= mm_access(task
, PTRACE_MODE_READ_FSCREDS
);
1888 if (IS_ERR_OR_NULL(mm
))
1891 if (!dname_to_vma_addr(dentry
, &vm_start
, &vm_end
)) {
1892 down_read(&mm
->mmap_sem
);
1893 exact_vma_exists
= !!find_exact_vma(mm
, vm_start
, vm_end
);
1894 up_read(&mm
->mmap_sem
);
1899 if (exact_vma_exists
) {
1900 task_dump_owner(task
, 0, &inode
->i_uid
, &inode
->i_gid
);
1902 security_task_to_inode(task
, inode
);
1907 put_task_struct(task
);
1913 static const struct dentry_operations tid_map_files_dentry_operations
= {
1914 .d_revalidate
= map_files_d_revalidate
,
1915 .d_delete
= pid_delete_dentry
,
1918 static int map_files_get_link(struct dentry
*dentry
, struct path
*path
)
1920 unsigned long vm_start
, vm_end
;
1921 struct vm_area_struct
*vma
;
1922 struct task_struct
*task
;
1923 struct mm_struct
*mm
;
1927 task
= get_proc_task(d_inode(dentry
));
1931 mm
= get_task_mm(task
);
1932 put_task_struct(task
);
1936 rc
= dname_to_vma_addr(dentry
, &vm_start
, &vm_end
);
1941 down_read(&mm
->mmap_sem
);
1942 vma
= find_exact_vma(mm
, vm_start
, vm_end
);
1943 if (vma
&& vma
->vm_file
) {
1944 *path
= vma
->vm_file
->f_path
;
1948 up_read(&mm
->mmap_sem
);
1956 struct map_files_info
{
1959 unsigned char name
[4*sizeof(long)+2]; /* max: %lx-%lx\0 */
1963 * Only allow CAP_SYS_ADMIN to follow the links, due to concerns about how the
1964 * symlinks may be used to bypass permissions on ancestor directories in the
1965 * path to the file in question.
1968 proc_map_files_get_link(struct dentry
*dentry
,
1969 struct inode
*inode
,
1970 struct delayed_call
*done
)
1972 if (!capable(CAP_SYS_ADMIN
))
1973 return ERR_PTR(-EPERM
);
1975 return proc_pid_get_link(dentry
, inode
, done
);
1979 * Identical to proc_pid_link_inode_operations except for get_link()
1981 static const struct inode_operations proc_map_files_link_inode_operations
= {
1982 .readlink
= proc_pid_readlink
,
1983 .get_link
= proc_map_files_get_link
,
1984 .setattr
= proc_setattr
,
1988 proc_map_files_instantiate(struct inode
*dir
, struct dentry
*dentry
,
1989 struct task_struct
*task
, const void *ptr
)
1991 fmode_t mode
= (fmode_t
)(unsigned long)ptr
;
1992 struct proc_inode
*ei
;
1993 struct inode
*inode
;
1995 inode
= proc_pid_make_inode(dir
->i_sb
, task
, S_IFLNK
|
1996 ((mode
& FMODE_READ
) ? S_IRUSR
: 0) |
1997 ((mode
& FMODE_WRITE
) ? S_IWUSR
: 0));
2002 ei
->op
.proc_get_link
= map_files_get_link
;
2004 inode
->i_op
= &proc_map_files_link_inode_operations
;
2007 d_set_d_op(dentry
, &tid_map_files_dentry_operations
);
2008 d_add(dentry
, inode
);
2013 static struct dentry
*proc_map_files_lookup(struct inode
*dir
,
2014 struct dentry
*dentry
, unsigned int flags
)
2016 unsigned long vm_start
, vm_end
;
2017 struct vm_area_struct
*vma
;
2018 struct task_struct
*task
;
2020 struct mm_struct
*mm
;
2023 task
= get_proc_task(dir
);
2028 if (!ptrace_may_access(task
, PTRACE_MODE_READ_FSCREDS
))
2032 if (dname_to_vma_addr(dentry
, &vm_start
, &vm_end
))
2035 mm
= get_task_mm(task
);
2039 down_read(&mm
->mmap_sem
);
2040 vma
= find_exact_vma(mm
, vm_start
, vm_end
);
2045 result
= proc_map_files_instantiate(dir
, dentry
, task
,
2046 (void *)(unsigned long)vma
->vm_file
->f_mode
);
2049 up_read(&mm
->mmap_sem
);
2052 put_task_struct(task
);
2054 return ERR_PTR(result
);
2057 static const struct inode_operations proc_map_files_inode_operations
= {
2058 .lookup
= proc_map_files_lookup
,
2059 .permission
= proc_fd_permission
,
2060 .setattr
= proc_setattr
,
2064 proc_map_files_readdir(struct file
*file
, struct dir_context
*ctx
)
2066 struct vm_area_struct
*vma
;
2067 struct task_struct
*task
;
2068 struct mm_struct
*mm
;
2069 unsigned long nr_files
, pos
, i
;
2070 struct flex_array
*fa
= NULL
;
2071 struct map_files_info info
;
2072 struct map_files_info
*p
;
2076 task
= get_proc_task(file_inode(file
));
2081 if (!ptrace_may_access(task
, PTRACE_MODE_READ_FSCREDS
))
2085 if (!dir_emit_dots(file
, ctx
))
2088 mm
= get_task_mm(task
);
2091 down_read(&mm
->mmap_sem
);
2096 * We need two passes here:
2098 * 1) Collect vmas of mapped files with mmap_sem taken
2099 * 2) Release mmap_sem and instantiate entries
2101 * otherwise we get lockdep complained, since filldir()
2102 * routine might require mmap_sem taken in might_fault().
2105 for (vma
= mm
->mmap
, pos
= 2; vma
; vma
= vma
->vm_next
) {
2106 if (vma
->vm_file
&& ++pos
> ctx
->pos
)
2111 fa
= flex_array_alloc(sizeof(info
), nr_files
,
2113 if (!fa
|| flex_array_prealloc(fa
, 0, nr_files
,
2117 flex_array_free(fa
);
2118 up_read(&mm
->mmap_sem
);
2122 for (i
= 0, vma
= mm
->mmap
, pos
= 2; vma
;
2123 vma
= vma
->vm_next
) {
2126 if (++pos
<= ctx
->pos
)
2129 info
.mode
= vma
->vm_file
->f_mode
;
2130 info
.len
= snprintf(info
.name
,
2131 sizeof(info
.name
), "%lx-%lx",
2132 vma
->vm_start
, vma
->vm_end
);
2133 if (flex_array_put(fa
, i
++, &info
, GFP_KERNEL
))
2137 up_read(&mm
->mmap_sem
);
2139 for (i
= 0; i
< nr_files
; i
++) {
2140 p
= flex_array_get(fa
, i
);
2141 if (!proc_fill_cache(file
, ctx
,
2143 proc_map_files_instantiate
,
2145 (void *)(unsigned long)p
->mode
))
2150 flex_array_free(fa
);
2154 put_task_struct(task
);
2159 static const struct file_operations proc_map_files_operations
= {
2160 .read
= generic_read_dir
,
2161 .iterate_shared
= proc_map_files_readdir
,
2162 .llseek
= generic_file_llseek
,
2165 #if defined(CONFIG_CHECKPOINT_RESTORE) && defined(CONFIG_POSIX_TIMERS)
2166 struct timers_private
{
2168 struct task_struct
*task
;
2169 struct sighand_struct
*sighand
;
2170 struct pid_namespace
*ns
;
2171 unsigned long flags
;
2174 static void *timers_start(struct seq_file
*m
, loff_t
*pos
)
2176 struct timers_private
*tp
= m
->private;
2178 tp
->task
= get_pid_task(tp
->pid
, PIDTYPE_PID
);
2180 return ERR_PTR(-ESRCH
);
2182 tp
->sighand
= lock_task_sighand(tp
->task
, &tp
->flags
);
2184 return ERR_PTR(-ESRCH
);
2186 return seq_list_start(&tp
->task
->signal
->posix_timers
, *pos
);
2189 static void *timers_next(struct seq_file
*m
, void *v
, loff_t
*pos
)
2191 struct timers_private
*tp
= m
->private;
2192 return seq_list_next(v
, &tp
->task
->signal
->posix_timers
, pos
);
2195 static void timers_stop(struct seq_file
*m
, void *v
)
2197 struct timers_private
*tp
= m
->private;
2200 unlock_task_sighand(tp
->task
, &tp
->flags
);
2205 put_task_struct(tp
->task
);
2210 static int show_timer(struct seq_file
*m
, void *v
)
2212 struct k_itimer
*timer
;
2213 struct timers_private
*tp
= m
->private;
2215 static const char * const nstr
[] = {
2216 [SIGEV_SIGNAL
] = "signal",
2217 [SIGEV_NONE
] = "none",
2218 [SIGEV_THREAD
] = "thread",
2221 timer
= list_entry((struct list_head
*)v
, struct k_itimer
, list
);
2222 notify
= timer
->it_sigev_notify
;
2224 seq_printf(m
, "ID: %d\n", timer
->it_id
);
2225 seq_printf(m
, "signal: %d/%p\n",
2226 timer
->sigq
->info
.si_signo
,
2227 timer
->sigq
->info
.si_value
.sival_ptr
);
2228 seq_printf(m
, "notify: %s/%s.%d\n",
2229 nstr
[notify
& ~SIGEV_THREAD_ID
],
2230 (notify
& SIGEV_THREAD_ID
) ? "tid" : "pid",
2231 pid_nr_ns(timer
->it_pid
, tp
->ns
));
2232 seq_printf(m
, "ClockID: %d\n", timer
->it_clock
);
2237 static const struct seq_operations proc_timers_seq_ops
= {
2238 .start
= timers_start
,
2239 .next
= timers_next
,
2240 .stop
= timers_stop
,
2244 static int proc_timers_open(struct inode
*inode
, struct file
*file
)
2246 struct timers_private
*tp
;
2248 tp
= __seq_open_private(file
, &proc_timers_seq_ops
,
2249 sizeof(struct timers_private
));
2253 tp
->pid
= proc_pid(inode
);
2254 tp
->ns
= inode
->i_sb
->s_fs_info
;
2258 static const struct file_operations proc_timers_operations
= {
2259 .open
= proc_timers_open
,
2261 .llseek
= seq_lseek
,
2262 .release
= seq_release_private
,
2266 static ssize_t
timerslack_ns_write(struct file
*file
, const char __user
*buf
,
2267 size_t count
, loff_t
*offset
)
2269 struct inode
*inode
= file_inode(file
);
2270 struct task_struct
*p
;
2274 err
= kstrtoull_from_user(buf
, count
, 10, &slack_ns
);
2278 p
= get_proc_task(inode
);
2283 if (!capable(CAP_SYS_NICE
)) {
2288 err
= security_task_setscheduler(p
);
2297 p
->timer_slack_ns
= p
->default_timer_slack_ns
;
2299 p
->timer_slack_ns
= slack_ns
;
2308 static int timerslack_ns_show(struct seq_file
*m
, void *v
)
2310 struct inode
*inode
= m
->private;
2311 struct task_struct
*p
;
2314 p
= get_proc_task(inode
);
2320 if (!capable(CAP_SYS_NICE
)) {
2324 err
= security_task_getscheduler(p
);
2330 seq_printf(m
, "%llu\n", p
->timer_slack_ns
);
2339 static int timerslack_ns_open(struct inode
*inode
, struct file
*filp
)
2341 return single_open(filp
, timerslack_ns_show
, inode
);
2344 static const struct file_operations proc_pid_set_timerslack_ns_operations
= {
2345 .open
= timerslack_ns_open
,
2347 .write
= timerslack_ns_write
,
2348 .llseek
= seq_lseek
,
2349 .release
= single_release
,
2352 static int proc_pident_instantiate(struct inode
*dir
,
2353 struct dentry
*dentry
, struct task_struct
*task
, const void *ptr
)
2355 const struct pid_entry
*p
= ptr
;
2356 struct inode
*inode
;
2357 struct proc_inode
*ei
;
2359 inode
= proc_pid_make_inode(dir
->i_sb
, task
, p
->mode
);
2364 if (S_ISDIR(inode
->i_mode
))
2365 set_nlink(inode
, 2); /* Use getattr to fix if necessary */
2367 inode
->i_op
= p
->iop
;
2369 inode
->i_fop
= p
->fop
;
2371 d_set_d_op(dentry
, &pid_dentry_operations
);
2372 d_add(dentry
, inode
);
2373 /* Close the race of the process dying before we return the dentry */
2374 if (pid_revalidate(dentry
, 0))
2380 static struct dentry
*proc_pident_lookup(struct inode
*dir
,
2381 struct dentry
*dentry
,
2382 const struct pid_entry
*ents
,
2386 struct task_struct
*task
= get_proc_task(dir
);
2387 const struct pid_entry
*p
, *last
;
2395 * Yes, it does not scale. And it should not. Don't add
2396 * new entries into /proc/<tgid>/ without very good reasons.
2398 last
= &ents
[nents
];
2399 for (p
= ents
; p
< last
; p
++) {
2400 if (p
->len
!= dentry
->d_name
.len
)
2402 if (!memcmp(dentry
->d_name
.name
, p
->name
, p
->len
))
2408 error
= proc_pident_instantiate(dir
, dentry
, task
, p
);
2410 put_task_struct(task
);
2412 return ERR_PTR(error
);
2415 static int proc_pident_readdir(struct file
*file
, struct dir_context
*ctx
,
2416 const struct pid_entry
*ents
, unsigned int nents
)
2418 struct task_struct
*task
= get_proc_task(file_inode(file
));
2419 const struct pid_entry
*p
;
2424 if (!dir_emit_dots(file
, ctx
))
2427 if (ctx
->pos
>= nents
+ 2)
2430 for (p
= ents
+ (ctx
->pos
- 2); p
< ents
+ nents
; p
++) {
2431 if (!proc_fill_cache(file
, ctx
, p
->name
, p
->len
,
2432 proc_pident_instantiate
, task
, p
))
2437 put_task_struct(task
);
2441 #ifdef CONFIG_SECURITY
2442 static ssize_t
proc_pid_attr_read(struct file
* file
, char __user
* buf
,
2443 size_t count
, loff_t
*ppos
)
2445 struct inode
* inode
= file_inode(file
);
2448 struct task_struct
*task
= get_proc_task(inode
);
2453 length
= security_getprocattr(task
,
2454 (char*)file
->f_path
.dentry
->d_name
.name
,
2456 put_task_struct(task
);
2458 length
= simple_read_from_buffer(buf
, count
, ppos
, p
, length
);
2463 static ssize_t
proc_pid_attr_write(struct file
* file
, const char __user
* buf
,
2464 size_t count
, loff_t
*ppos
)
2466 struct inode
* inode
= file_inode(file
);
2469 struct task_struct
*task
= get_proc_task(inode
);
2475 /* A task may only write its own attributes. */
2477 if (current
!= task
)
2480 if (count
> PAGE_SIZE
)
2483 /* No partial writes. */
2488 page
= memdup_user(buf
, count
);
2490 length
= PTR_ERR(page
);
2494 /* Guard against adverse ptrace interaction */
2495 length
= mutex_lock_interruptible(¤t
->signal
->cred_guard_mutex
);
2499 length
= security_setprocattr(file
->f_path
.dentry
->d_name
.name
,
2501 mutex_unlock(¤t
->signal
->cred_guard_mutex
);
2505 put_task_struct(task
);
2510 static const struct file_operations proc_pid_attr_operations
= {
2511 .read
= proc_pid_attr_read
,
2512 .write
= proc_pid_attr_write
,
2513 .llseek
= generic_file_llseek
,
2516 static const struct pid_entry attr_dir_stuff
[] = {
2517 REG("current", S_IRUGO
|S_IWUGO
, proc_pid_attr_operations
),
2518 REG("prev", S_IRUGO
, proc_pid_attr_operations
),
2519 REG("exec", S_IRUGO
|S_IWUGO
, proc_pid_attr_operations
),
2520 REG("fscreate", S_IRUGO
|S_IWUGO
, proc_pid_attr_operations
),
2521 REG("keycreate", S_IRUGO
|S_IWUGO
, proc_pid_attr_operations
),
2522 REG("sockcreate", S_IRUGO
|S_IWUGO
, proc_pid_attr_operations
),
2525 static int proc_attr_dir_readdir(struct file
*file
, struct dir_context
*ctx
)
2527 return proc_pident_readdir(file
, ctx
,
2528 attr_dir_stuff
, ARRAY_SIZE(attr_dir_stuff
));
2531 static const struct file_operations proc_attr_dir_operations
= {
2532 .read
= generic_read_dir
,
2533 .iterate_shared
= proc_attr_dir_readdir
,
2534 .llseek
= generic_file_llseek
,
2537 static struct dentry
*proc_attr_dir_lookup(struct inode
*dir
,
2538 struct dentry
*dentry
, unsigned int flags
)
2540 return proc_pident_lookup(dir
, dentry
,
2541 attr_dir_stuff
, ARRAY_SIZE(attr_dir_stuff
));
2544 static const struct inode_operations proc_attr_dir_inode_operations
= {
2545 .lookup
= proc_attr_dir_lookup
,
2546 .getattr
= pid_getattr
,
2547 .setattr
= proc_setattr
,
2552 #ifdef CONFIG_ELF_CORE
2553 static ssize_t
proc_coredump_filter_read(struct file
*file
, char __user
*buf
,
2554 size_t count
, loff_t
*ppos
)
2556 struct task_struct
*task
= get_proc_task(file_inode(file
));
2557 struct mm_struct
*mm
;
2558 char buffer
[PROC_NUMBUF
];
2566 mm
= get_task_mm(task
);
2568 len
= snprintf(buffer
, sizeof(buffer
), "%08lx\n",
2569 ((mm
->flags
& MMF_DUMP_FILTER_MASK
) >>
2570 MMF_DUMP_FILTER_SHIFT
));
2572 ret
= simple_read_from_buffer(buf
, count
, ppos
, buffer
, len
);
2575 put_task_struct(task
);
2580 static ssize_t
proc_coredump_filter_write(struct file
*file
,
2581 const char __user
*buf
,
2585 struct task_struct
*task
;
2586 struct mm_struct
*mm
;
2592 ret
= kstrtouint_from_user(buf
, count
, 0, &val
);
2597 task
= get_proc_task(file_inode(file
));
2601 mm
= get_task_mm(task
);
2606 for (i
= 0, mask
= 1; i
< MMF_DUMP_FILTER_BITS
; i
++, mask
<<= 1) {
2608 set_bit(i
+ MMF_DUMP_FILTER_SHIFT
, &mm
->flags
);
2610 clear_bit(i
+ MMF_DUMP_FILTER_SHIFT
, &mm
->flags
);
2615 put_task_struct(task
);
2622 static const struct file_operations proc_coredump_filter_operations
= {
2623 .read
= proc_coredump_filter_read
,
2624 .write
= proc_coredump_filter_write
,
2625 .llseek
= generic_file_llseek
,
2629 #ifdef CONFIG_TASK_IO_ACCOUNTING
2630 static int do_io_accounting(struct task_struct
*task
, struct seq_file
*m
, int whole
)
2632 struct task_io_accounting acct
= task
->ioac
;
2633 unsigned long flags
;
2636 result
= mutex_lock_killable(&task
->signal
->cred_guard_mutex
);
2640 if (!ptrace_may_access(task
, PTRACE_MODE_READ_FSCREDS
)) {
2645 if (whole
&& lock_task_sighand(task
, &flags
)) {
2646 struct task_struct
*t
= task
;
2648 task_io_accounting_add(&acct
, &task
->signal
->ioac
);
2649 while_each_thread(task
, t
)
2650 task_io_accounting_add(&acct
, &t
->ioac
);
2652 unlock_task_sighand(task
, &flags
);
2659 "read_bytes: %llu\n"
2660 "write_bytes: %llu\n"
2661 "cancelled_write_bytes: %llu\n",
2662 (unsigned long long)acct
.rchar
,
2663 (unsigned long long)acct
.wchar
,
2664 (unsigned long long)acct
.syscr
,
2665 (unsigned long long)acct
.syscw
,
2666 (unsigned long long)acct
.read_bytes
,
2667 (unsigned long long)acct
.write_bytes
,
2668 (unsigned long long)acct
.cancelled_write_bytes
);
2672 mutex_unlock(&task
->signal
->cred_guard_mutex
);
2676 static int proc_tid_io_accounting(struct seq_file
*m
, struct pid_namespace
*ns
,
2677 struct pid
*pid
, struct task_struct
*task
)
2679 return do_io_accounting(task
, m
, 0);
2682 static int proc_tgid_io_accounting(struct seq_file
*m
, struct pid_namespace
*ns
,
2683 struct pid
*pid
, struct task_struct
*task
)
2685 return do_io_accounting(task
, m
, 1);
2687 #endif /* CONFIG_TASK_IO_ACCOUNTING */
2689 #ifdef CONFIG_USER_NS
2690 static int proc_id_map_open(struct inode
*inode
, struct file
*file
,
2691 const struct seq_operations
*seq_ops
)
2693 struct user_namespace
*ns
= NULL
;
2694 struct task_struct
*task
;
2695 struct seq_file
*seq
;
2698 task
= get_proc_task(inode
);
2701 ns
= get_user_ns(task_cred_xxx(task
, user_ns
));
2703 put_task_struct(task
);
2708 ret
= seq_open(file
, seq_ops
);
2712 seq
= file
->private_data
;
2722 static int proc_id_map_release(struct inode
*inode
, struct file
*file
)
2724 struct seq_file
*seq
= file
->private_data
;
2725 struct user_namespace
*ns
= seq
->private;
2727 return seq_release(inode
, file
);
2730 static int proc_uid_map_open(struct inode
*inode
, struct file
*file
)
2732 return proc_id_map_open(inode
, file
, &proc_uid_seq_operations
);
2735 static int proc_gid_map_open(struct inode
*inode
, struct file
*file
)
2737 return proc_id_map_open(inode
, file
, &proc_gid_seq_operations
);
2740 static int proc_projid_map_open(struct inode
*inode
, struct file
*file
)
2742 return proc_id_map_open(inode
, file
, &proc_projid_seq_operations
);
2745 static const struct file_operations proc_uid_map_operations
= {
2746 .open
= proc_uid_map_open
,
2747 .write
= proc_uid_map_write
,
2749 .llseek
= seq_lseek
,
2750 .release
= proc_id_map_release
,
2753 static const struct file_operations proc_gid_map_operations
= {
2754 .open
= proc_gid_map_open
,
2755 .write
= proc_gid_map_write
,
2757 .llseek
= seq_lseek
,
2758 .release
= proc_id_map_release
,
2761 static const struct file_operations proc_projid_map_operations
= {
2762 .open
= proc_projid_map_open
,
2763 .write
= proc_projid_map_write
,
2765 .llseek
= seq_lseek
,
2766 .release
= proc_id_map_release
,
2769 static int proc_setgroups_open(struct inode
*inode
, struct file
*file
)
2771 struct user_namespace
*ns
= NULL
;
2772 struct task_struct
*task
;
2776 task
= get_proc_task(inode
);
2779 ns
= get_user_ns(task_cred_xxx(task
, user_ns
));
2781 put_task_struct(task
);
2786 if (file
->f_mode
& FMODE_WRITE
) {
2788 if (!ns_capable(ns
, CAP_SYS_ADMIN
))
2792 ret
= single_open(file
, &proc_setgroups_show
, ns
);
2803 static int proc_setgroups_release(struct inode
*inode
, struct file
*file
)
2805 struct seq_file
*seq
= file
->private_data
;
2806 struct user_namespace
*ns
= seq
->private;
2807 int ret
= single_release(inode
, file
);
2812 static const struct file_operations proc_setgroups_operations
= {
2813 .open
= proc_setgroups_open
,
2814 .write
= proc_setgroups_write
,
2816 .llseek
= seq_lseek
,
2817 .release
= proc_setgroups_release
,
2819 #endif /* CONFIG_USER_NS */
2821 static int proc_pid_personality(struct seq_file
*m
, struct pid_namespace
*ns
,
2822 struct pid
*pid
, struct task_struct
*task
)
2824 int err
= lock_trace(task
);
2826 seq_printf(m
, "%08x\n", task
->personality
);
2835 static const struct file_operations proc_task_operations
;
2836 static const struct inode_operations proc_task_inode_operations
;
2838 static const struct pid_entry tgid_base_stuff
[] = {
2839 DIR("task", S_IRUGO
|S_IXUGO
, proc_task_inode_operations
, proc_task_operations
),
2840 DIR("fd", S_IRUSR
|S_IXUSR
, proc_fd_inode_operations
, proc_fd_operations
),
2841 DIR("map_files", S_IRUSR
|S_IXUSR
, proc_map_files_inode_operations
, proc_map_files_operations
),
2842 DIR("fdinfo", S_IRUSR
|S_IXUSR
, proc_fdinfo_inode_operations
, proc_fdinfo_operations
),
2843 DIR("ns", S_IRUSR
|S_IXUGO
, proc_ns_dir_inode_operations
, proc_ns_dir_operations
),
2845 DIR("net", S_IRUGO
|S_IXUGO
, proc_net_inode_operations
, proc_net_operations
),
2847 REG("environ", S_IRUSR
, proc_environ_operations
),
2848 REG("auxv", S_IRUSR
, proc_auxv_operations
),
2849 ONE("status", S_IRUGO
, proc_pid_status
),
2850 ONE("personality", S_IRUSR
, proc_pid_personality
),
2851 ONE("limits", S_IRUGO
, proc_pid_limits
),
2852 #ifdef CONFIG_SCHED_DEBUG
2853 REG("sched", S_IRUGO
|S_IWUSR
, proc_pid_sched_operations
),
2855 #ifdef CONFIG_SCHED_AUTOGROUP
2856 REG("autogroup", S_IRUGO
|S_IWUSR
, proc_pid_sched_autogroup_operations
),
2858 REG("comm", S_IRUGO
|S_IWUSR
, proc_pid_set_comm_operations
),
2859 #ifdef CONFIG_HAVE_ARCH_TRACEHOOK
2860 ONE("syscall", S_IRUSR
, proc_pid_syscall
),
2862 REG("cmdline", S_IRUGO
, proc_pid_cmdline_ops
),
2863 ONE("stat", S_IRUGO
, proc_tgid_stat
),
2864 ONE("statm", S_IRUGO
, proc_pid_statm
),
2865 REG("maps", S_IRUGO
, proc_pid_maps_operations
),
2867 REG("numa_maps", S_IRUGO
, proc_pid_numa_maps_operations
),
2869 REG("mem", S_IRUSR
|S_IWUSR
, proc_mem_operations
),
2870 LNK("cwd", proc_cwd_link
),
2871 LNK("root", proc_root_link
),
2872 LNK("exe", proc_exe_link
),
2873 REG("mounts", S_IRUGO
, proc_mounts_operations
),
2874 REG("mountinfo", S_IRUGO
, proc_mountinfo_operations
),
2875 REG("mountstats", S_IRUSR
, proc_mountstats_operations
),
2876 #ifdef CONFIG_PROC_PAGE_MONITOR
2877 REG("clear_refs", S_IWUSR
, proc_clear_refs_operations
),
2878 REG("smaps", S_IRUGO
, proc_pid_smaps_operations
),
2879 REG("pagemap", S_IRUSR
, proc_pagemap_operations
),
2881 #ifdef CONFIG_SECURITY
2882 DIR("attr", S_IRUGO
|S_IXUGO
, proc_attr_dir_inode_operations
, proc_attr_dir_operations
),
2884 #ifdef CONFIG_KALLSYMS
2885 ONE("wchan", S_IRUGO
, proc_pid_wchan
),
2887 #ifdef CONFIG_STACKTRACE
2888 ONE("stack", S_IRUSR
, proc_pid_stack
),
2890 #ifdef CONFIG_SCHED_INFO
2891 ONE("schedstat", S_IRUGO
, proc_pid_schedstat
),
2893 #ifdef CONFIG_LATENCYTOP
2894 REG("latency", S_IRUGO
, proc_lstats_operations
),
2896 #ifdef CONFIG_PROC_PID_CPUSET
2897 ONE("cpuset", S_IRUGO
, proc_cpuset_show
),
2899 #ifdef CONFIG_CGROUPS
2900 ONE("cgroup", S_IRUGO
, proc_cgroup_show
),
2902 ONE("oom_score", S_IRUGO
, proc_oom_score
),
2903 REG("oom_adj", S_IRUGO
|S_IWUSR
, proc_oom_adj_operations
),
2904 REG("oom_score_adj", S_IRUGO
|S_IWUSR
, proc_oom_score_adj_operations
),
2905 #ifdef CONFIG_AUDITSYSCALL
2906 REG("loginuid", S_IWUSR
|S_IRUGO
, proc_loginuid_operations
),
2907 REG("sessionid", S_IRUGO
, proc_sessionid_operations
),
2909 #ifdef CONFIG_FAULT_INJECTION
2910 REG("make-it-fail", S_IRUGO
|S_IWUSR
, proc_fault_inject_operations
),
2912 #ifdef CONFIG_ELF_CORE
2913 REG("coredump_filter", S_IRUGO
|S_IWUSR
, proc_coredump_filter_operations
),
2915 #ifdef CONFIG_TASK_IO_ACCOUNTING
2916 ONE("io", S_IRUSR
, proc_tgid_io_accounting
),
2918 #ifdef CONFIG_HARDWALL
2919 ONE("hardwall", S_IRUGO
, proc_pid_hardwall
),
2921 #ifdef CONFIG_USER_NS
2922 REG("uid_map", S_IRUGO
|S_IWUSR
, proc_uid_map_operations
),
2923 REG("gid_map", S_IRUGO
|S_IWUSR
, proc_gid_map_operations
),
2924 REG("projid_map", S_IRUGO
|S_IWUSR
, proc_projid_map_operations
),
2925 REG("setgroups", S_IRUGO
|S_IWUSR
, proc_setgroups_operations
),
2927 #if defined(CONFIG_CHECKPOINT_RESTORE) && defined(CONFIG_POSIX_TIMERS)
2928 REG("timers", S_IRUGO
, proc_timers_operations
),
2930 REG("timerslack_ns", S_IRUGO
|S_IWUGO
, proc_pid_set_timerslack_ns_operations
),
2933 static int proc_tgid_base_readdir(struct file
*file
, struct dir_context
*ctx
)
2935 return proc_pident_readdir(file
, ctx
,
2936 tgid_base_stuff
, ARRAY_SIZE(tgid_base_stuff
));
2939 static const struct file_operations proc_tgid_base_operations
= {
2940 .read
= generic_read_dir
,
2941 .iterate_shared
= proc_tgid_base_readdir
,
2942 .llseek
= generic_file_llseek
,
2945 static struct dentry
*proc_tgid_base_lookup(struct inode
*dir
, struct dentry
*dentry
, unsigned int flags
)
2947 return proc_pident_lookup(dir
, dentry
,
2948 tgid_base_stuff
, ARRAY_SIZE(tgid_base_stuff
));
2951 static const struct inode_operations proc_tgid_base_inode_operations
= {
2952 .lookup
= proc_tgid_base_lookup
,
2953 .getattr
= pid_getattr
,
2954 .setattr
= proc_setattr
,
2955 .permission
= proc_pid_permission
,
2958 static void proc_flush_task_mnt(struct vfsmount
*mnt
, pid_t pid
, pid_t tgid
)
2960 struct dentry
*dentry
, *leader
, *dir
;
2961 char buf
[PROC_NUMBUF
];
2965 name
.len
= snprintf(buf
, sizeof(buf
), "%d", pid
);
2966 /* no ->d_hash() rejects on procfs */
2967 dentry
= d_hash_and_lookup(mnt
->mnt_root
, &name
);
2969 d_invalidate(dentry
);
2977 name
.len
= snprintf(buf
, sizeof(buf
), "%d", tgid
);
2978 leader
= d_hash_and_lookup(mnt
->mnt_root
, &name
);
2983 name
.len
= strlen(name
.name
);
2984 dir
= d_hash_and_lookup(leader
, &name
);
2986 goto out_put_leader
;
2989 name
.len
= snprintf(buf
, sizeof(buf
), "%d", pid
);
2990 dentry
= d_hash_and_lookup(dir
, &name
);
2992 d_invalidate(dentry
);
3004 * proc_flush_task - Remove dcache entries for @task from the /proc dcache.
3005 * @task: task that should be flushed.
3007 * When flushing dentries from proc, one needs to flush them from global
3008 * proc (proc_mnt) and from all the namespaces' procs this task was seen
3009 * in. This call is supposed to do all of this job.
3011 * Looks in the dcache for
3013 * /proc/@tgid/task/@pid
3014 * if either directory is present flushes it and all of it'ts children
3017 * It is safe and reasonable to cache /proc entries for a task until
3018 * that task exits. After that they just clog up the dcache with
3019 * useless entries, possibly causing useful dcache entries to be
3020 * flushed instead. This routine is proved to flush those useless
3021 * dcache entries at process exit time.
3023 * NOTE: This routine is just an optimization so it does not guarantee
3024 * that no dcache entries will exist at process exit time it
3025 * just makes it very unlikely that any will persist.
3028 void proc_flush_task(struct task_struct
*task
)
3031 struct pid
*pid
, *tgid
;
3034 pid
= task_pid(task
);
3035 tgid
= task_tgid(task
);
3037 for (i
= 0; i
<= pid
->level
; i
++) {
3038 upid
= &pid
->numbers
[i
];
3039 proc_flush_task_mnt(upid
->ns
->proc_mnt
, upid
->nr
,
3040 tgid
->numbers
[i
].nr
);
3044 static int proc_pid_instantiate(struct inode
*dir
,
3045 struct dentry
* dentry
,
3046 struct task_struct
*task
, const void *ptr
)
3048 struct inode
*inode
;
3050 inode
= proc_pid_make_inode(dir
->i_sb
, task
, S_IFDIR
| S_IRUGO
| S_IXUGO
);
3054 inode
->i_op
= &proc_tgid_base_inode_operations
;
3055 inode
->i_fop
= &proc_tgid_base_operations
;
3056 inode
->i_flags
|=S_IMMUTABLE
;
3058 set_nlink(inode
, nlink_tgid
);
3060 d_set_d_op(dentry
, &pid_dentry_operations
);
3062 d_add(dentry
, inode
);
3063 /* Close the race of the process dying before we return the dentry */
3064 if (pid_revalidate(dentry
, 0))
3070 struct dentry
*proc_pid_lookup(struct inode
*dir
, struct dentry
* dentry
, unsigned int flags
)
3072 int result
= -ENOENT
;
3073 struct task_struct
*task
;
3075 struct pid_namespace
*ns
;
3077 tgid
= name_to_int(&dentry
->d_name
);
3081 ns
= dentry
->d_sb
->s_fs_info
;
3083 task
= find_task_by_pid_ns(tgid
, ns
);
3085 get_task_struct(task
);
3090 result
= proc_pid_instantiate(dir
, dentry
, task
, NULL
);
3091 put_task_struct(task
);
3093 return ERR_PTR(result
);
3097 * Find the first task with tgid >= tgid
3102 struct task_struct
*task
;
3104 static struct tgid_iter
next_tgid(struct pid_namespace
*ns
, struct tgid_iter iter
)
3109 put_task_struct(iter
.task
);
3113 pid
= find_ge_pid(iter
.tgid
, ns
);
3115 iter
.tgid
= pid_nr_ns(pid
, ns
);
3116 iter
.task
= pid_task(pid
, PIDTYPE_PID
);
3117 /* What we to know is if the pid we have find is the
3118 * pid of a thread_group_leader. Testing for task
3119 * being a thread_group_leader is the obvious thing
3120 * todo but there is a window when it fails, due to
3121 * the pid transfer logic in de_thread.
3123 * So we perform the straight forward test of seeing
3124 * if the pid we have found is the pid of a thread
3125 * group leader, and don't worry if the task we have
3126 * found doesn't happen to be a thread group leader.
3127 * As we don't care in the case of readdir.
3129 if (!iter
.task
|| !has_group_leader_pid(iter
.task
)) {
3133 get_task_struct(iter
.task
);
3139 #define TGID_OFFSET (FIRST_PROCESS_ENTRY + 2)
3141 /* for the /proc/ directory itself, after non-process stuff has been done */
3142 int proc_pid_readdir(struct file
*file
, struct dir_context
*ctx
)
3144 struct tgid_iter iter
;
3145 struct pid_namespace
*ns
= file_inode(file
)->i_sb
->s_fs_info
;
3146 loff_t pos
= ctx
->pos
;
3148 if (pos
>= PID_MAX_LIMIT
+ TGID_OFFSET
)
3151 if (pos
== TGID_OFFSET
- 2) {
3152 struct inode
*inode
= d_inode(ns
->proc_self
);
3153 if (!dir_emit(ctx
, "self", 4, inode
->i_ino
, DT_LNK
))
3155 ctx
->pos
= pos
= pos
+ 1;
3157 if (pos
== TGID_OFFSET
- 1) {
3158 struct inode
*inode
= d_inode(ns
->proc_thread_self
);
3159 if (!dir_emit(ctx
, "thread-self", 11, inode
->i_ino
, DT_LNK
))
3161 ctx
->pos
= pos
= pos
+ 1;
3163 iter
.tgid
= pos
- TGID_OFFSET
;
3165 for (iter
= next_tgid(ns
, iter
);
3167 iter
.tgid
+= 1, iter
= next_tgid(ns
, iter
)) {
3168 char name
[PROC_NUMBUF
];
3172 if (!has_pid_permissions(ns
, iter
.task
, HIDEPID_INVISIBLE
))
3175 len
= snprintf(name
, sizeof(name
), "%d", iter
.tgid
);
3176 ctx
->pos
= iter
.tgid
+ TGID_OFFSET
;
3177 if (!proc_fill_cache(file
, ctx
, name
, len
,
3178 proc_pid_instantiate
, iter
.task
, NULL
)) {
3179 put_task_struct(iter
.task
);
3183 ctx
->pos
= PID_MAX_LIMIT
+ TGID_OFFSET
;
3188 * proc_tid_comm_permission is a special permission function exclusively
3189 * used for the node /proc/<pid>/task/<tid>/comm.
3190 * It bypasses generic permission checks in the case where a task of the same
3191 * task group attempts to access the node.
3192 * The rationale behind this is that glibc and bionic access this node for
3193 * cross thread naming (pthread_set/getname_np(!self)). However, if
3194 * PR_SET_DUMPABLE gets set to 0 this node among others becomes uid=0 gid=0,
3195 * which locks out the cross thread naming implementation.
3196 * This function makes sure that the node is always accessible for members of
3197 * same thread group.
3199 static int proc_tid_comm_permission(struct inode
*inode
, int mask
)
3201 bool is_same_tgroup
;
3202 struct task_struct
*task
;
3204 task
= get_proc_task(inode
);
3207 is_same_tgroup
= same_thread_group(current
, task
);
3208 put_task_struct(task
);
3210 if (likely(is_same_tgroup
&& !(mask
& MAY_EXEC
))) {
3211 /* This file (/proc/<pid>/task/<tid>/comm) can always be
3212 * read or written by the members of the corresponding
3218 return generic_permission(inode
, mask
);
3221 static const struct inode_operations proc_tid_comm_inode_operations
= {
3222 .permission
= proc_tid_comm_permission
,
3228 static const struct pid_entry tid_base_stuff
[] = {
3229 DIR("fd", S_IRUSR
|S_IXUSR
, proc_fd_inode_operations
, proc_fd_operations
),
3230 DIR("fdinfo", S_IRUSR
|S_IXUSR
, proc_fdinfo_inode_operations
, proc_fdinfo_operations
),
3231 DIR("ns", S_IRUSR
|S_IXUGO
, proc_ns_dir_inode_operations
, proc_ns_dir_operations
),
3233 DIR("net", S_IRUGO
|S_IXUGO
, proc_net_inode_operations
, proc_net_operations
),
3235 REG("environ", S_IRUSR
, proc_environ_operations
),
3236 REG("auxv", S_IRUSR
, proc_auxv_operations
),
3237 ONE("status", S_IRUGO
, proc_pid_status
),
3238 ONE("personality", S_IRUSR
, proc_pid_personality
),
3239 ONE("limits", S_IRUGO
, proc_pid_limits
),
3240 #ifdef CONFIG_SCHED_DEBUG
3241 REG("sched", S_IRUGO
|S_IWUSR
, proc_pid_sched_operations
),
3243 NOD("comm", S_IFREG
|S_IRUGO
|S_IWUSR
,
3244 &proc_tid_comm_inode_operations
,
3245 &proc_pid_set_comm_operations
, {}),
3246 #ifdef CONFIG_HAVE_ARCH_TRACEHOOK
3247 ONE("syscall", S_IRUSR
, proc_pid_syscall
),
3249 REG("cmdline", S_IRUGO
, proc_pid_cmdline_ops
),
3250 ONE("stat", S_IRUGO
, proc_tid_stat
),
3251 ONE("statm", S_IRUGO
, proc_pid_statm
),
3252 REG("maps", S_IRUGO
, proc_tid_maps_operations
),
3253 #ifdef CONFIG_PROC_CHILDREN
3254 REG("children", S_IRUGO
, proc_tid_children_operations
),
3257 REG("numa_maps", S_IRUGO
, proc_tid_numa_maps_operations
),
3259 REG("mem", S_IRUSR
|S_IWUSR
, proc_mem_operations
),
3260 LNK("cwd", proc_cwd_link
),
3261 LNK("root", proc_root_link
),
3262 LNK("exe", proc_exe_link
),
3263 REG("mounts", S_IRUGO
, proc_mounts_operations
),
3264 REG("mountinfo", S_IRUGO
, proc_mountinfo_operations
),
3265 #ifdef CONFIG_PROC_PAGE_MONITOR
3266 REG("clear_refs", S_IWUSR
, proc_clear_refs_operations
),
3267 REG("smaps", S_IRUGO
, proc_tid_smaps_operations
),
3268 REG("pagemap", S_IRUSR
, proc_pagemap_operations
),
3270 #ifdef CONFIG_SECURITY
3271 DIR("attr", S_IRUGO
|S_IXUGO
, proc_attr_dir_inode_operations
, proc_attr_dir_operations
),
3273 #ifdef CONFIG_KALLSYMS
3274 ONE("wchan", S_IRUGO
, proc_pid_wchan
),
3276 #ifdef CONFIG_STACKTRACE
3277 ONE("stack", S_IRUSR
, proc_pid_stack
),
3279 #ifdef CONFIG_SCHED_INFO
3280 ONE("schedstat", S_IRUGO
, proc_pid_schedstat
),
3282 #ifdef CONFIG_LATENCYTOP
3283 REG("latency", S_IRUGO
, proc_lstats_operations
),
3285 #ifdef CONFIG_PROC_PID_CPUSET
3286 ONE("cpuset", S_IRUGO
, proc_cpuset_show
),
3288 #ifdef CONFIG_CGROUPS
3289 ONE("cgroup", S_IRUGO
, proc_cgroup_show
),
3291 ONE("oom_score", S_IRUGO
, proc_oom_score
),
3292 REG("oom_adj", S_IRUGO
|S_IWUSR
, proc_oom_adj_operations
),
3293 REG("oom_score_adj", S_IRUGO
|S_IWUSR
, proc_oom_score_adj_operations
),
3294 #ifdef CONFIG_AUDITSYSCALL
3295 REG("loginuid", S_IWUSR
|S_IRUGO
, proc_loginuid_operations
),
3296 REG("sessionid", S_IRUGO
, proc_sessionid_operations
),
3298 #ifdef CONFIG_FAULT_INJECTION
3299 REG("make-it-fail", S_IRUGO
|S_IWUSR
, proc_fault_inject_operations
),
3301 #ifdef CONFIG_TASK_IO_ACCOUNTING
3302 ONE("io", S_IRUSR
, proc_tid_io_accounting
),
3304 #ifdef CONFIG_HARDWALL
3305 ONE("hardwall", S_IRUGO
, proc_pid_hardwall
),
3307 #ifdef CONFIG_USER_NS
3308 REG("uid_map", S_IRUGO
|S_IWUSR
, proc_uid_map_operations
),
3309 REG("gid_map", S_IRUGO
|S_IWUSR
, proc_gid_map_operations
),
3310 REG("projid_map", S_IRUGO
|S_IWUSR
, proc_projid_map_operations
),
3311 REG("setgroups", S_IRUGO
|S_IWUSR
, proc_setgroups_operations
),
3315 static int proc_tid_base_readdir(struct file
*file
, struct dir_context
*ctx
)
3317 return proc_pident_readdir(file
, ctx
,
3318 tid_base_stuff
, ARRAY_SIZE(tid_base_stuff
));
3321 static struct dentry
*proc_tid_base_lookup(struct inode
*dir
, struct dentry
*dentry
, unsigned int flags
)
3323 return proc_pident_lookup(dir
, dentry
,
3324 tid_base_stuff
, ARRAY_SIZE(tid_base_stuff
));
3327 static const struct file_operations proc_tid_base_operations
= {
3328 .read
= generic_read_dir
,
3329 .iterate_shared
= proc_tid_base_readdir
,
3330 .llseek
= generic_file_llseek
,
3333 static const struct inode_operations proc_tid_base_inode_operations
= {
3334 .lookup
= proc_tid_base_lookup
,
3335 .getattr
= pid_getattr
,
3336 .setattr
= proc_setattr
,
3339 static int proc_task_instantiate(struct inode
*dir
,
3340 struct dentry
*dentry
, struct task_struct
*task
, const void *ptr
)
3342 struct inode
*inode
;
3343 inode
= proc_pid_make_inode(dir
->i_sb
, task
, S_IFDIR
| S_IRUGO
| S_IXUGO
);
3347 inode
->i_op
= &proc_tid_base_inode_operations
;
3348 inode
->i_fop
= &proc_tid_base_operations
;
3349 inode
->i_flags
|=S_IMMUTABLE
;
3351 set_nlink(inode
, nlink_tid
);
3353 d_set_d_op(dentry
, &pid_dentry_operations
);
3355 d_add(dentry
, inode
);
3356 /* Close the race of the process dying before we return the dentry */
3357 if (pid_revalidate(dentry
, 0))
3363 static struct dentry
*proc_task_lookup(struct inode
*dir
, struct dentry
* dentry
, unsigned int flags
)
3365 int result
= -ENOENT
;
3366 struct task_struct
*task
;
3367 struct task_struct
*leader
= get_proc_task(dir
);
3369 struct pid_namespace
*ns
;
3374 tid
= name_to_int(&dentry
->d_name
);
3378 ns
= dentry
->d_sb
->s_fs_info
;
3380 task
= find_task_by_pid_ns(tid
, ns
);
3382 get_task_struct(task
);
3386 if (!same_thread_group(leader
, task
))
3389 result
= proc_task_instantiate(dir
, dentry
, task
, NULL
);
3391 put_task_struct(task
);
3393 put_task_struct(leader
);
3395 return ERR_PTR(result
);
3399 * Find the first tid of a thread group to return to user space.
3401 * Usually this is just the thread group leader, but if the users
3402 * buffer was too small or there was a seek into the middle of the
3403 * directory we have more work todo.
3405 * In the case of a short read we start with find_task_by_pid.
3407 * In the case of a seek we start with the leader and walk nr
3410 static struct task_struct
*first_tid(struct pid
*pid
, int tid
, loff_t f_pos
,
3411 struct pid_namespace
*ns
)
3413 struct task_struct
*pos
, *task
;
3414 unsigned long nr
= f_pos
;
3416 if (nr
!= f_pos
) /* 32bit overflow? */
3420 task
= pid_task(pid
, PIDTYPE_PID
);
3424 /* Attempt to start with the tid of a thread */
3426 pos
= find_task_by_pid_ns(tid
, ns
);
3427 if (pos
&& same_thread_group(pos
, task
))
3431 /* If nr exceeds the number of threads there is nothing todo */
3432 if (nr
>= get_nr_threads(task
))
3435 /* If we haven't found our starting place yet start
3436 * with the leader and walk nr threads forward.
3438 pos
= task
= task
->group_leader
;
3442 } while_each_thread(task
, pos
);
3447 get_task_struct(pos
);
3454 * Find the next thread in the thread list.
3455 * Return NULL if there is an error or no next thread.
3457 * The reference to the input task_struct is released.
3459 static struct task_struct
*next_tid(struct task_struct
*start
)
3461 struct task_struct
*pos
= NULL
;
3463 if (pid_alive(start
)) {
3464 pos
= next_thread(start
);
3465 if (thread_group_leader(pos
))
3468 get_task_struct(pos
);
3471 put_task_struct(start
);
3475 /* for the /proc/TGID/task/ directories */
3476 static int proc_task_readdir(struct file
*file
, struct dir_context
*ctx
)
3478 struct inode
*inode
= file_inode(file
);
3479 struct task_struct
*task
;
3480 struct pid_namespace
*ns
;
3483 if (proc_inode_is_dead(inode
))
3486 if (!dir_emit_dots(file
, ctx
))
3489 /* f_version caches the tgid value that the last readdir call couldn't
3490 * return. lseek aka telldir automagically resets f_version to 0.
3492 ns
= inode
->i_sb
->s_fs_info
;
3493 tid
= (int)file
->f_version
;
3494 file
->f_version
= 0;
3495 for (task
= first_tid(proc_pid(inode
), tid
, ctx
->pos
- 2, ns
);
3497 task
= next_tid(task
), ctx
->pos
++) {
3498 char name
[PROC_NUMBUF
];
3500 tid
= task_pid_nr_ns(task
, ns
);
3501 len
= snprintf(name
, sizeof(name
), "%d", tid
);
3502 if (!proc_fill_cache(file
, ctx
, name
, len
,
3503 proc_task_instantiate
, task
, NULL
)) {
3504 /* returning this tgid failed, save it as the first
3505 * pid for the next readir call */
3506 file
->f_version
= (u64
)tid
;
3507 put_task_struct(task
);
3515 static int proc_task_getattr(struct vfsmount
*mnt
, struct dentry
*dentry
, struct kstat
*stat
)
3517 struct inode
*inode
= d_inode(dentry
);
3518 struct task_struct
*p
= get_proc_task(inode
);
3519 generic_fillattr(inode
, stat
);
3522 stat
->nlink
+= get_nr_threads(p
);
3529 static const struct inode_operations proc_task_inode_operations
= {
3530 .lookup
= proc_task_lookup
,
3531 .getattr
= proc_task_getattr
,
3532 .setattr
= proc_setattr
,
3533 .permission
= proc_pid_permission
,
3536 static const struct file_operations proc_task_operations
= {
3537 .read
= generic_read_dir
,
3538 .iterate_shared
= proc_task_readdir
,
3539 .llseek
= generic_file_llseek
,
3542 void __init
set_proc_pid_nlink(void)
3544 nlink_tid
= pid_entry_nlink(tid_base_stuff
, ARRAY_SIZE(tid_base_stuff
));
3545 nlink_tgid
= pid_entry_nlink(tgid_base_stuff
, ARRAY_SIZE(tgid_base_stuff
));