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/sched/mm.h>
90 #include <linux/sched/coredump.h>
91 #include <linux/sched/debug.h>
92 #include <linux/sched/stat.h>
93 #include <linux/flex_array.h>
94 #include <linux/posix-timers.h>
95 #ifdef CONFIG_HARDWALL
96 #include <asm/hardwall.h>
98 #include <trace/events/oom.h>
103 * Implementing inode permission operations in /proc is almost
104 * certainly an error. Permission checks need to happen during
105 * each system call not at open time. The reason is that most of
106 * what we wish to check for permissions in /proc varies at runtime.
108 * The classic example of a problem is opening file descriptors
109 * in /proc for a task before it execs a suid executable.
113 static u8 nlink_tgid
;
119 const struct inode_operations
*iop
;
120 const struct file_operations
*fop
;
124 #define NOD(NAME, MODE, IOP, FOP, OP) { \
126 .len = sizeof(NAME) - 1, \
133 #define DIR(NAME, MODE, iops, fops) \
134 NOD(NAME, (S_IFDIR|(MODE)), &iops, &fops, {} )
135 #define LNK(NAME, get_link) \
136 NOD(NAME, (S_IFLNK|S_IRWXUGO), \
137 &proc_pid_link_inode_operations, NULL, \
138 { .proc_get_link = get_link } )
139 #define REG(NAME, MODE, fops) \
140 NOD(NAME, (S_IFREG|(MODE)), NULL, &fops, {})
141 #define ONE(NAME, MODE, show) \
142 NOD(NAME, (S_IFREG|(MODE)), \
143 NULL, &proc_single_file_operations, \
144 { .proc_show = show } )
147 * Count the number of hardlinks for the pid_entry table, excluding the .
150 static unsigned int __init
pid_entry_nlink(const struct pid_entry
*entries
,
157 for (i
= 0; i
< n
; ++i
) {
158 if (S_ISDIR(entries
[i
].mode
))
165 static int get_task_root(struct task_struct
*task
, struct path
*root
)
167 int result
= -ENOENT
;
171 get_fs_root(task
->fs
, root
);
178 static int proc_cwd_link(struct dentry
*dentry
, struct path
*path
)
180 struct task_struct
*task
= get_proc_task(d_inode(dentry
));
181 int result
= -ENOENT
;
186 get_fs_pwd(task
->fs
, path
);
190 put_task_struct(task
);
195 static int proc_root_link(struct dentry
*dentry
, struct path
*path
)
197 struct task_struct
*task
= get_proc_task(d_inode(dentry
));
198 int result
= -ENOENT
;
201 result
= get_task_root(task
, path
);
202 put_task_struct(task
);
207 static ssize_t
proc_pid_cmdline_read(struct file
*file
, char __user
*buf
,
208 size_t _count
, loff_t
*pos
)
210 struct task_struct
*tsk
;
211 struct mm_struct
*mm
;
213 unsigned long count
= _count
;
214 unsigned long arg_start
, arg_end
, env_start
, env_end
;
215 unsigned long len1
, len2
, len
;
222 tsk
= get_proc_task(file_inode(file
));
225 mm
= get_task_mm(tsk
);
226 put_task_struct(tsk
);
229 /* Check if process spawned far enough to have cmdline. */
235 page
= (char *)__get_free_page(GFP_TEMPORARY
);
241 down_read(&mm
->mmap_sem
);
242 arg_start
= mm
->arg_start
;
243 arg_end
= mm
->arg_end
;
244 env_start
= mm
->env_start
;
245 env_end
= mm
->env_end
;
246 up_read(&mm
->mmap_sem
);
248 BUG_ON(arg_start
> arg_end
);
249 BUG_ON(env_start
> env_end
);
251 len1
= arg_end
- arg_start
;
252 len2
= env_end
- env_start
;
260 * Inherently racy -- command line shares address space
261 * with code and data.
263 rv
= access_remote_vm(mm
, arg_end
- 1, &c
, 1, 0);
270 /* Command line (set of strings) occupies whole ARGV. */
274 p
= arg_start
+ *pos
;
276 while (count
> 0 && len
> 0) {
280 _count
= min3(count
, len
, PAGE_SIZE
);
281 nr_read
= access_remote_vm(mm
, p
, page
, _count
, 0);
287 if (copy_to_user(buf
, page
, nr_read
)) {
300 * Command line (1 string) occupies ARGV and
307 { .p
= arg_start
, .len
= len1
},
308 { .p
= env_start
, .len
= len2
},
314 while (i
< 2 && pos1
>= cmdline
[i
].len
) {
315 pos1
-= cmdline
[i
].len
;
319 p
= cmdline
[i
].p
+ pos1
;
320 len
= cmdline
[i
].len
- pos1
;
321 while (count
> 0 && len
> 0) {
322 unsigned int _count
, l
;
326 _count
= min3(count
, len
, PAGE_SIZE
);
327 nr_read
= access_remote_vm(mm
, p
, page
, _count
, 0);
334 * Command line can be shorter than whole ARGV
335 * even if last "marker" byte says it is not.
338 l
= strnlen(page
, nr_read
);
344 if (copy_to_user(buf
, page
, nr_read
)) {
359 /* Only first chunk can be read partially. */
366 free_page((unsigned long)page
);
374 static const struct file_operations proc_pid_cmdline_ops
= {
375 .read
= proc_pid_cmdline_read
,
376 .llseek
= generic_file_llseek
,
379 #ifdef CONFIG_KALLSYMS
381 * Provides a wchan file via kallsyms in a proper one-value-per-file format.
382 * Returns the resolved symbol. If that fails, simply return the address.
384 static int proc_pid_wchan(struct seq_file
*m
, struct pid_namespace
*ns
,
385 struct pid
*pid
, struct task_struct
*task
)
388 char symname
[KSYM_NAME_LEN
];
390 wchan
= get_wchan(task
);
392 if (wchan
&& ptrace_may_access(task
, PTRACE_MODE_READ_FSCREDS
)
393 && !lookup_symbol_name(wchan
, symname
))
394 seq_printf(m
, "%s", symname
);
400 #endif /* CONFIG_KALLSYMS */
402 static int lock_trace(struct task_struct
*task
)
404 int err
= mutex_lock_killable(&task
->signal
->cred_guard_mutex
);
407 if (!ptrace_may_access(task
, PTRACE_MODE_ATTACH_FSCREDS
)) {
408 mutex_unlock(&task
->signal
->cred_guard_mutex
);
414 static void unlock_trace(struct task_struct
*task
)
416 mutex_unlock(&task
->signal
->cred_guard_mutex
);
419 #ifdef CONFIG_STACKTRACE
421 #define MAX_STACK_TRACE_DEPTH 64
423 static int proc_pid_stack(struct seq_file
*m
, struct pid_namespace
*ns
,
424 struct pid
*pid
, struct task_struct
*task
)
426 struct stack_trace trace
;
427 unsigned long *entries
;
431 entries
= kmalloc(MAX_STACK_TRACE_DEPTH
* sizeof(*entries
), GFP_KERNEL
);
435 trace
.nr_entries
= 0;
436 trace
.max_entries
= MAX_STACK_TRACE_DEPTH
;
437 trace
.entries
= entries
;
440 err
= lock_trace(task
);
442 save_stack_trace_tsk(task
, &trace
);
444 for (i
= 0; i
< trace
.nr_entries
; i
++) {
445 seq_printf(m
, "[<%pK>] %pB\n",
446 (void *)entries
[i
], (void *)entries
[i
]);
456 #ifdef CONFIG_SCHED_INFO
458 * Provides /proc/PID/schedstat
460 static int proc_pid_schedstat(struct seq_file
*m
, struct pid_namespace
*ns
,
461 struct pid
*pid
, struct task_struct
*task
)
463 if (unlikely(!sched_info_on()))
464 seq_printf(m
, "0 0 0\n");
466 seq_printf(m
, "%llu %llu %lu\n",
467 (unsigned long long)task
->se
.sum_exec_runtime
,
468 (unsigned long long)task
->sched_info
.run_delay
,
469 task
->sched_info
.pcount
);
475 #ifdef CONFIG_LATENCYTOP
476 static int lstats_show_proc(struct seq_file
*m
, void *v
)
479 struct inode
*inode
= m
->private;
480 struct task_struct
*task
= get_proc_task(inode
);
484 seq_puts(m
, "Latency Top version : v0.1\n");
485 for (i
= 0; i
< 32; i
++) {
486 struct latency_record
*lr
= &task
->latency_record
[i
];
487 if (lr
->backtrace
[0]) {
489 seq_printf(m
, "%i %li %li",
490 lr
->count
, lr
->time
, lr
->max
);
491 for (q
= 0; q
< LT_BACKTRACEDEPTH
; q
++) {
492 unsigned long bt
= lr
->backtrace
[q
];
497 seq_printf(m
, " %ps", (void *)bt
);
503 put_task_struct(task
);
507 static int lstats_open(struct inode
*inode
, struct file
*file
)
509 return single_open(file
, lstats_show_proc
, inode
);
512 static ssize_t
lstats_write(struct file
*file
, const char __user
*buf
,
513 size_t count
, loff_t
*offs
)
515 struct task_struct
*task
= get_proc_task(file_inode(file
));
519 clear_all_latency_tracing(task
);
520 put_task_struct(task
);
525 static const struct file_operations proc_lstats_operations
= {
528 .write
= lstats_write
,
530 .release
= single_release
,
535 static int proc_oom_score(struct seq_file
*m
, struct pid_namespace
*ns
,
536 struct pid
*pid
, struct task_struct
*task
)
538 unsigned long totalpages
= totalram_pages
+ total_swap_pages
;
539 unsigned long points
= 0;
541 points
= oom_badness(task
, NULL
, NULL
, totalpages
) *
543 seq_printf(m
, "%lu\n", points
);
553 static const struct limit_names lnames
[RLIM_NLIMITS
] = {
554 [RLIMIT_CPU
] = {"Max cpu time", "seconds"},
555 [RLIMIT_FSIZE
] = {"Max file size", "bytes"},
556 [RLIMIT_DATA
] = {"Max data size", "bytes"},
557 [RLIMIT_STACK
] = {"Max stack size", "bytes"},
558 [RLIMIT_CORE
] = {"Max core file size", "bytes"},
559 [RLIMIT_RSS
] = {"Max resident set", "bytes"},
560 [RLIMIT_NPROC
] = {"Max processes", "processes"},
561 [RLIMIT_NOFILE
] = {"Max open files", "files"},
562 [RLIMIT_MEMLOCK
] = {"Max locked memory", "bytes"},
563 [RLIMIT_AS
] = {"Max address space", "bytes"},
564 [RLIMIT_LOCKS
] = {"Max file locks", "locks"},
565 [RLIMIT_SIGPENDING
] = {"Max pending signals", "signals"},
566 [RLIMIT_MSGQUEUE
] = {"Max msgqueue size", "bytes"},
567 [RLIMIT_NICE
] = {"Max nice priority", NULL
},
568 [RLIMIT_RTPRIO
] = {"Max realtime priority", NULL
},
569 [RLIMIT_RTTIME
] = {"Max realtime timeout", "us"},
572 /* Display limits for a process */
573 static int proc_pid_limits(struct seq_file
*m
, struct pid_namespace
*ns
,
574 struct pid
*pid
, struct task_struct
*task
)
579 struct rlimit rlim
[RLIM_NLIMITS
];
581 if (!lock_task_sighand(task
, &flags
))
583 memcpy(rlim
, task
->signal
->rlim
, sizeof(struct rlimit
) * RLIM_NLIMITS
);
584 unlock_task_sighand(task
, &flags
);
587 * print the file header
589 seq_printf(m
, "%-25s %-20s %-20s %-10s\n",
590 "Limit", "Soft Limit", "Hard Limit", "Units");
592 for (i
= 0; i
< RLIM_NLIMITS
; i
++) {
593 if (rlim
[i
].rlim_cur
== RLIM_INFINITY
)
594 seq_printf(m
, "%-25s %-20s ",
595 lnames
[i
].name
, "unlimited");
597 seq_printf(m
, "%-25s %-20lu ",
598 lnames
[i
].name
, rlim
[i
].rlim_cur
);
600 if (rlim
[i
].rlim_max
== RLIM_INFINITY
)
601 seq_printf(m
, "%-20s ", "unlimited");
603 seq_printf(m
, "%-20lu ", rlim
[i
].rlim_max
);
606 seq_printf(m
, "%-10s\n", lnames
[i
].unit
);
614 #ifdef CONFIG_HAVE_ARCH_TRACEHOOK
615 static int proc_pid_syscall(struct seq_file
*m
, struct pid_namespace
*ns
,
616 struct pid
*pid
, struct task_struct
*task
)
619 unsigned long args
[6], sp
, pc
;
622 res
= lock_trace(task
);
626 if (task_current_syscall(task
, &nr
, args
, 6, &sp
, &pc
))
627 seq_puts(m
, "running\n");
629 seq_printf(m
, "%ld 0x%lx 0x%lx\n", nr
, sp
, pc
);
632 "%ld 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx\n",
634 args
[0], args
[1], args
[2], args
[3], args
[4], args
[5],
640 #endif /* CONFIG_HAVE_ARCH_TRACEHOOK */
642 /************************************************************************/
643 /* Here the fs part begins */
644 /************************************************************************/
646 /* permission checks */
647 static int proc_fd_access_allowed(struct inode
*inode
)
649 struct task_struct
*task
;
651 /* Allow access to a task's file descriptors if it is us or we
652 * may use ptrace attach to the process and find out that
655 task
= get_proc_task(inode
);
657 allowed
= ptrace_may_access(task
, PTRACE_MODE_READ_FSCREDS
);
658 put_task_struct(task
);
663 int proc_setattr(struct dentry
*dentry
, struct iattr
*attr
)
666 struct inode
*inode
= d_inode(dentry
);
668 if (attr
->ia_valid
& ATTR_MODE
)
671 error
= setattr_prepare(dentry
, attr
);
675 setattr_copy(inode
, attr
);
676 mark_inode_dirty(inode
);
681 * May current process learn task's sched/cmdline info (for hide_pid_min=1)
682 * or euid/egid (for hide_pid_min=2)?
684 static bool has_pid_permissions(struct pid_namespace
*pid
,
685 struct task_struct
*task
,
688 if (pid
->hide_pid
< hide_pid_min
)
690 if (in_group_p(pid
->pid_gid
))
692 return ptrace_may_access(task
, PTRACE_MODE_READ_FSCREDS
);
696 static int proc_pid_permission(struct inode
*inode
, int mask
)
698 struct pid_namespace
*pid
= inode
->i_sb
->s_fs_info
;
699 struct task_struct
*task
;
702 task
= get_proc_task(inode
);
705 has_perms
= has_pid_permissions(pid
, task
, HIDEPID_NO_ACCESS
);
706 put_task_struct(task
);
709 if (pid
->hide_pid
== HIDEPID_INVISIBLE
) {
711 * Let's make getdents(), stat(), and open()
712 * consistent with each other. If a process
713 * may not stat() a file, it shouldn't be seen
721 return generic_permission(inode
, mask
);
726 static const struct inode_operations proc_def_inode_operations
= {
727 .setattr
= proc_setattr
,
730 static int proc_single_show(struct seq_file
*m
, void *v
)
732 struct inode
*inode
= m
->private;
733 struct pid_namespace
*ns
;
735 struct task_struct
*task
;
738 ns
= inode
->i_sb
->s_fs_info
;
739 pid
= proc_pid(inode
);
740 task
= get_pid_task(pid
, PIDTYPE_PID
);
744 ret
= PROC_I(inode
)->op
.proc_show(m
, ns
, pid
, task
);
746 put_task_struct(task
);
750 static int proc_single_open(struct inode
*inode
, struct file
*filp
)
752 return single_open(filp
, proc_single_show
, inode
);
755 static const struct file_operations proc_single_file_operations
= {
756 .open
= proc_single_open
,
759 .release
= single_release
,
763 struct mm_struct
*proc_mem_open(struct inode
*inode
, unsigned int mode
)
765 struct task_struct
*task
= get_proc_task(inode
);
766 struct mm_struct
*mm
= ERR_PTR(-ESRCH
);
769 mm
= mm_access(task
, mode
| PTRACE_MODE_FSCREDS
);
770 put_task_struct(task
);
772 if (!IS_ERR_OR_NULL(mm
)) {
773 /* ensure this mm_struct can't be freed */
775 /* but do not pin its memory */
783 static int __mem_open(struct inode
*inode
, struct file
*file
, unsigned int mode
)
785 struct mm_struct
*mm
= proc_mem_open(inode
, mode
);
790 file
->private_data
= mm
;
794 static int mem_open(struct inode
*inode
, struct file
*file
)
796 int ret
= __mem_open(inode
, file
, PTRACE_MODE_ATTACH
);
798 /* OK to pass negative loff_t, we can catch out-of-range */
799 file
->f_mode
|= FMODE_UNSIGNED_OFFSET
;
804 static ssize_t
mem_rw(struct file
*file
, char __user
*buf
,
805 size_t count
, loff_t
*ppos
, int write
)
807 struct mm_struct
*mm
= file
->private_data
;
808 unsigned long addr
= *ppos
;
816 page
= (char *)__get_free_page(GFP_TEMPORARY
);
821 if (!mmget_not_zero(mm
))
824 flags
= FOLL_FORCE
| (write
? FOLL_WRITE
: 0);
827 int this_len
= min_t(int, count
, PAGE_SIZE
);
829 if (write
&& copy_from_user(page
, buf
, this_len
)) {
834 this_len
= access_remote_vm(mm
, addr
, page
, this_len
, flags
);
841 if (!write
&& copy_to_user(buf
, page
, this_len
)) {
855 free_page((unsigned long) page
);
859 static ssize_t
mem_read(struct file
*file
, char __user
*buf
,
860 size_t count
, loff_t
*ppos
)
862 return mem_rw(file
, buf
, count
, ppos
, 0);
865 static ssize_t
mem_write(struct file
*file
, const char __user
*buf
,
866 size_t count
, loff_t
*ppos
)
868 return mem_rw(file
, (char __user
*)buf
, count
, ppos
, 1);
871 loff_t
mem_lseek(struct file
*file
, loff_t offset
, int orig
)
875 file
->f_pos
= offset
;
878 file
->f_pos
+= offset
;
883 force_successful_syscall_return();
887 static int mem_release(struct inode
*inode
, struct file
*file
)
889 struct mm_struct
*mm
= file
->private_data
;
895 static const struct file_operations proc_mem_operations
= {
900 .release
= mem_release
,
903 static int environ_open(struct inode
*inode
, struct file
*file
)
905 return __mem_open(inode
, file
, PTRACE_MODE_READ
);
908 static ssize_t
environ_read(struct file
*file
, char __user
*buf
,
909 size_t count
, loff_t
*ppos
)
912 unsigned long src
= *ppos
;
914 struct mm_struct
*mm
= file
->private_data
;
915 unsigned long env_start
, env_end
;
917 /* Ensure the process spawned far enough to have an environment. */
918 if (!mm
|| !mm
->env_end
)
921 page
= (char *)__get_free_page(GFP_TEMPORARY
);
926 if (!mmget_not_zero(mm
))
929 down_read(&mm
->mmap_sem
);
930 env_start
= mm
->env_start
;
931 env_end
= mm
->env_end
;
932 up_read(&mm
->mmap_sem
);
935 size_t this_len
, max_len
;
938 if (src
>= (env_end
- env_start
))
941 this_len
= env_end
- (env_start
+ src
);
943 max_len
= min_t(size_t, PAGE_SIZE
, count
);
944 this_len
= min(max_len
, this_len
);
946 retval
= access_remote_vm(mm
, (env_start
+ src
), page
, this_len
, 0);
953 if (copy_to_user(buf
, page
, retval
)) {
967 free_page((unsigned long) page
);
971 static const struct file_operations proc_environ_operations
= {
972 .open
= environ_open
,
973 .read
= environ_read
,
974 .llseek
= generic_file_llseek
,
975 .release
= mem_release
,
978 static int auxv_open(struct inode
*inode
, struct file
*file
)
980 return __mem_open(inode
, file
, PTRACE_MODE_READ_FSCREDS
);
983 static ssize_t
auxv_read(struct file
*file
, char __user
*buf
,
984 size_t count
, loff_t
*ppos
)
986 struct mm_struct
*mm
= file
->private_data
;
987 unsigned int nwords
= 0;
993 } while (mm
->saved_auxv
[nwords
- 2] != 0); /* AT_NULL */
994 return simple_read_from_buffer(buf
, count
, ppos
, mm
->saved_auxv
,
995 nwords
* sizeof(mm
->saved_auxv
[0]));
998 static const struct file_operations proc_auxv_operations
= {
1001 .llseek
= generic_file_llseek
,
1002 .release
= mem_release
,
1005 static ssize_t
oom_adj_read(struct file
*file
, char __user
*buf
, size_t count
,
1008 struct task_struct
*task
= get_proc_task(file_inode(file
));
1009 char buffer
[PROC_NUMBUF
];
1010 int oom_adj
= OOM_ADJUST_MIN
;
1015 if (task
->signal
->oom_score_adj
== OOM_SCORE_ADJ_MAX
)
1016 oom_adj
= OOM_ADJUST_MAX
;
1018 oom_adj
= (task
->signal
->oom_score_adj
* -OOM_DISABLE
) /
1020 put_task_struct(task
);
1021 len
= snprintf(buffer
, sizeof(buffer
), "%d\n", oom_adj
);
1022 return simple_read_from_buffer(buf
, count
, ppos
, buffer
, len
);
1025 static int __set_oom_adj(struct file
*file
, int oom_adj
, bool legacy
)
1027 static DEFINE_MUTEX(oom_adj_mutex
);
1028 struct mm_struct
*mm
= NULL
;
1029 struct task_struct
*task
;
1032 task
= get_proc_task(file_inode(file
));
1036 mutex_lock(&oom_adj_mutex
);
1038 if (oom_adj
< task
->signal
->oom_score_adj
&&
1039 !capable(CAP_SYS_RESOURCE
)) {
1044 * /proc/pid/oom_adj is provided for legacy purposes, ask users to use
1045 * /proc/pid/oom_score_adj instead.
1047 pr_warn_once("%s (%d): /proc/%d/oom_adj is deprecated, please use /proc/%d/oom_score_adj instead.\n",
1048 current
->comm
, task_pid_nr(current
), task_pid_nr(task
),
1051 if ((short)oom_adj
< task
->signal
->oom_score_adj_min
&&
1052 !capable(CAP_SYS_RESOURCE
)) {
1059 * Make sure we will check other processes sharing the mm if this is
1060 * not vfrok which wants its own oom_score_adj.
1061 * pin the mm so it doesn't go away and get reused after task_unlock
1063 if (!task
->vfork_done
) {
1064 struct task_struct
*p
= find_lock_task_mm(task
);
1067 if (atomic_read(&p
->mm
->mm_users
) > 1) {
1075 task
->signal
->oom_score_adj
= oom_adj
;
1076 if (!legacy
&& has_capability_noaudit(current
, CAP_SYS_RESOURCE
))
1077 task
->signal
->oom_score_adj_min
= (short)oom_adj
;
1078 trace_oom_score_adj_update(task
);
1081 struct task_struct
*p
;
1084 for_each_process(p
) {
1085 if (same_thread_group(task
, p
))
1088 /* do not touch kernel threads or the global init */
1089 if (p
->flags
& PF_KTHREAD
|| is_global_init(p
))
1093 if (!p
->vfork_done
&& process_shares_mm(p
, mm
)) {
1094 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",
1095 task_pid_nr(p
), p
->comm
,
1096 p
->signal
->oom_score_adj
, oom_adj
,
1097 task_pid_nr(task
), task
->comm
);
1098 p
->signal
->oom_score_adj
= oom_adj
;
1099 if (!legacy
&& has_capability_noaudit(current
, CAP_SYS_RESOURCE
))
1100 p
->signal
->oom_score_adj_min
= (short)oom_adj
;
1108 mutex_unlock(&oom_adj_mutex
);
1109 put_task_struct(task
);
1114 * /proc/pid/oom_adj exists solely for backwards compatibility with previous
1115 * kernels. The effective policy is defined by oom_score_adj, which has a
1116 * different scale: oom_adj grew exponentially and oom_score_adj grows linearly.
1117 * Values written to oom_adj are simply mapped linearly to oom_score_adj.
1118 * Processes that become oom disabled via oom_adj will still be oom disabled
1119 * with this implementation.
1121 * oom_adj cannot be removed since existing userspace binaries use it.
1123 static ssize_t
oom_adj_write(struct file
*file
, const char __user
*buf
,
1124 size_t count
, loff_t
*ppos
)
1126 char buffer
[PROC_NUMBUF
];
1130 memset(buffer
, 0, sizeof(buffer
));
1131 if (count
> sizeof(buffer
) - 1)
1132 count
= sizeof(buffer
) - 1;
1133 if (copy_from_user(buffer
, buf
, count
)) {
1138 err
= kstrtoint(strstrip(buffer
), 0, &oom_adj
);
1141 if ((oom_adj
< OOM_ADJUST_MIN
|| oom_adj
> OOM_ADJUST_MAX
) &&
1142 oom_adj
!= OOM_DISABLE
) {
1148 * Scale /proc/pid/oom_score_adj appropriately ensuring that a maximum
1149 * value is always attainable.
1151 if (oom_adj
== OOM_ADJUST_MAX
)
1152 oom_adj
= OOM_SCORE_ADJ_MAX
;
1154 oom_adj
= (oom_adj
* OOM_SCORE_ADJ_MAX
) / -OOM_DISABLE
;
1156 err
= __set_oom_adj(file
, oom_adj
, true);
1158 return err
< 0 ? err
: count
;
1161 static const struct file_operations proc_oom_adj_operations
= {
1162 .read
= oom_adj_read
,
1163 .write
= oom_adj_write
,
1164 .llseek
= generic_file_llseek
,
1167 static ssize_t
oom_score_adj_read(struct file
*file
, char __user
*buf
,
1168 size_t count
, loff_t
*ppos
)
1170 struct task_struct
*task
= get_proc_task(file_inode(file
));
1171 char buffer
[PROC_NUMBUF
];
1172 short oom_score_adj
= OOM_SCORE_ADJ_MIN
;
1177 oom_score_adj
= task
->signal
->oom_score_adj
;
1178 put_task_struct(task
);
1179 len
= snprintf(buffer
, sizeof(buffer
), "%hd\n", oom_score_adj
);
1180 return simple_read_from_buffer(buf
, count
, ppos
, buffer
, len
);
1183 static ssize_t
oom_score_adj_write(struct file
*file
, const char __user
*buf
,
1184 size_t count
, loff_t
*ppos
)
1186 char buffer
[PROC_NUMBUF
];
1190 memset(buffer
, 0, sizeof(buffer
));
1191 if (count
> sizeof(buffer
) - 1)
1192 count
= sizeof(buffer
) - 1;
1193 if (copy_from_user(buffer
, buf
, count
)) {
1198 err
= kstrtoint(strstrip(buffer
), 0, &oom_score_adj
);
1201 if (oom_score_adj
< OOM_SCORE_ADJ_MIN
||
1202 oom_score_adj
> OOM_SCORE_ADJ_MAX
) {
1207 err
= __set_oom_adj(file
, oom_score_adj
, false);
1209 return err
< 0 ? err
: count
;
1212 static const struct file_operations proc_oom_score_adj_operations
= {
1213 .read
= oom_score_adj_read
,
1214 .write
= oom_score_adj_write
,
1215 .llseek
= default_llseek
,
1218 #ifdef CONFIG_AUDITSYSCALL
1219 #define TMPBUFLEN 11
1220 static ssize_t
proc_loginuid_read(struct file
* file
, char __user
* buf
,
1221 size_t count
, loff_t
*ppos
)
1223 struct inode
* inode
= file_inode(file
);
1224 struct task_struct
*task
= get_proc_task(inode
);
1226 char tmpbuf
[TMPBUFLEN
];
1230 length
= scnprintf(tmpbuf
, TMPBUFLEN
, "%u",
1231 from_kuid(file
->f_cred
->user_ns
,
1232 audit_get_loginuid(task
)));
1233 put_task_struct(task
);
1234 return simple_read_from_buffer(buf
, count
, ppos
, tmpbuf
, length
);
1237 static ssize_t
proc_loginuid_write(struct file
* file
, const char __user
* buf
,
1238 size_t count
, loff_t
*ppos
)
1240 struct inode
* inode
= file_inode(file
);
1246 if (current
!= pid_task(proc_pid(inode
), PIDTYPE_PID
)) {
1253 /* No partial writes. */
1257 rv
= kstrtou32_from_user(buf
, count
, 10, &loginuid
);
1261 /* is userspace tring to explicitly UNSET the loginuid? */
1262 if (loginuid
== AUDIT_UID_UNSET
) {
1263 kloginuid
= INVALID_UID
;
1265 kloginuid
= make_kuid(file
->f_cred
->user_ns
, loginuid
);
1266 if (!uid_valid(kloginuid
))
1270 rv
= audit_set_loginuid(kloginuid
);
1276 static const struct file_operations proc_loginuid_operations
= {
1277 .read
= proc_loginuid_read
,
1278 .write
= proc_loginuid_write
,
1279 .llseek
= generic_file_llseek
,
1282 static ssize_t
proc_sessionid_read(struct file
* file
, char __user
* buf
,
1283 size_t count
, loff_t
*ppos
)
1285 struct inode
* inode
= file_inode(file
);
1286 struct task_struct
*task
= get_proc_task(inode
);
1288 char tmpbuf
[TMPBUFLEN
];
1292 length
= scnprintf(tmpbuf
, TMPBUFLEN
, "%u",
1293 audit_get_sessionid(task
));
1294 put_task_struct(task
);
1295 return simple_read_from_buffer(buf
, count
, ppos
, tmpbuf
, length
);
1298 static const struct file_operations proc_sessionid_operations
= {
1299 .read
= proc_sessionid_read
,
1300 .llseek
= generic_file_llseek
,
1304 #ifdef CONFIG_FAULT_INJECTION
1305 static ssize_t
proc_fault_inject_read(struct file
* file
, char __user
* buf
,
1306 size_t count
, loff_t
*ppos
)
1308 struct task_struct
*task
= get_proc_task(file_inode(file
));
1309 char buffer
[PROC_NUMBUF
];
1315 make_it_fail
= task
->make_it_fail
;
1316 put_task_struct(task
);
1318 len
= snprintf(buffer
, sizeof(buffer
), "%i\n", make_it_fail
);
1320 return simple_read_from_buffer(buf
, count
, ppos
, buffer
, len
);
1323 static ssize_t
proc_fault_inject_write(struct file
* file
,
1324 const char __user
* buf
, size_t count
, loff_t
*ppos
)
1326 struct task_struct
*task
;
1327 char buffer
[PROC_NUMBUF
];
1331 if (!capable(CAP_SYS_RESOURCE
))
1333 memset(buffer
, 0, sizeof(buffer
));
1334 if (count
> sizeof(buffer
) - 1)
1335 count
= sizeof(buffer
) - 1;
1336 if (copy_from_user(buffer
, buf
, count
))
1338 rv
= kstrtoint(strstrip(buffer
), 0, &make_it_fail
);
1341 if (make_it_fail
< 0 || make_it_fail
> 1)
1344 task
= get_proc_task(file_inode(file
));
1347 task
->make_it_fail
= make_it_fail
;
1348 put_task_struct(task
);
1353 static const struct file_operations proc_fault_inject_operations
= {
1354 .read
= proc_fault_inject_read
,
1355 .write
= proc_fault_inject_write
,
1356 .llseek
= generic_file_llseek
,
1361 #ifdef CONFIG_SCHED_DEBUG
1363 * Print out various scheduling related per-task fields:
1365 static int sched_show(struct seq_file
*m
, void *v
)
1367 struct inode
*inode
= m
->private;
1368 struct task_struct
*p
;
1370 p
= get_proc_task(inode
);
1373 proc_sched_show_task(p
, m
);
1381 sched_write(struct file
*file
, const char __user
*buf
,
1382 size_t count
, loff_t
*offset
)
1384 struct inode
*inode
= file_inode(file
);
1385 struct task_struct
*p
;
1387 p
= get_proc_task(inode
);
1390 proc_sched_set_task(p
);
1397 static int sched_open(struct inode
*inode
, struct file
*filp
)
1399 return single_open(filp
, sched_show
, inode
);
1402 static const struct file_operations proc_pid_sched_operations
= {
1405 .write
= sched_write
,
1406 .llseek
= seq_lseek
,
1407 .release
= single_release
,
1412 #ifdef CONFIG_SCHED_AUTOGROUP
1414 * Print out autogroup related information:
1416 static int sched_autogroup_show(struct seq_file
*m
, void *v
)
1418 struct inode
*inode
= m
->private;
1419 struct task_struct
*p
;
1421 p
= get_proc_task(inode
);
1424 proc_sched_autogroup_show_task(p
, m
);
1432 sched_autogroup_write(struct file
*file
, const char __user
*buf
,
1433 size_t count
, loff_t
*offset
)
1435 struct inode
*inode
= file_inode(file
);
1436 struct task_struct
*p
;
1437 char buffer
[PROC_NUMBUF
];
1441 memset(buffer
, 0, sizeof(buffer
));
1442 if (count
> sizeof(buffer
) - 1)
1443 count
= sizeof(buffer
) - 1;
1444 if (copy_from_user(buffer
, buf
, count
))
1447 err
= kstrtoint(strstrip(buffer
), 0, &nice
);
1451 p
= get_proc_task(inode
);
1455 err
= proc_sched_autogroup_set_nice(p
, nice
);
1464 static int sched_autogroup_open(struct inode
*inode
, struct file
*filp
)
1468 ret
= single_open(filp
, sched_autogroup_show
, NULL
);
1470 struct seq_file
*m
= filp
->private_data
;
1477 static const struct file_operations proc_pid_sched_autogroup_operations
= {
1478 .open
= sched_autogroup_open
,
1480 .write
= sched_autogroup_write
,
1481 .llseek
= seq_lseek
,
1482 .release
= single_release
,
1485 #endif /* CONFIG_SCHED_AUTOGROUP */
1487 static ssize_t
comm_write(struct file
*file
, const char __user
*buf
,
1488 size_t count
, loff_t
*offset
)
1490 struct inode
*inode
= file_inode(file
);
1491 struct task_struct
*p
;
1492 char buffer
[TASK_COMM_LEN
];
1493 const size_t maxlen
= sizeof(buffer
) - 1;
1495 memset(buffer
, 0, sizeof(buffer
));
1496 if (copy_from_user(buffer
, buf
, count
> maxlen
? maxlen
: count
))
1499 p
= get_proc_task(inode
);
1503 if (same_thread_group(current
, p
))
1504 set_task_comm(p
, buffer
);
1513 static int comm_show(struct seq_file
*m
, void *v
)
1515 struct inode
*inode
= m
->private;
1516 struct task_struct
*p
;
1518 p
= get_proc_task(inode
);
1523 seq_printf(m
, "%s\n", p
->comm
);
1531 static int comm_open(struct inode
*inode
, struct file
*filp
)
1533 return single_open(filp
, comm_show
, inode
);
1536 static const struct file_operations proc_pid_set_comm_operations
= {
1539 .write
= comm_write
,
1540 .llseek
= seq_lseek
,
1541 .release
= single_release
,
1544 static int proc_exe_link(struct dentry
*dentry
, struct path
*exe_path
)
1546 struct task_struct
*task
;
1547 struct file
*exe_file
;
1549 task
= get_proc_task(d_inode(dentry
));
1552 exe_file
= get_task_exe_file(task
);
1553 put_task_struct(task
);
1555 *exe_path
= exe_file
->f_path
;
1556 path_get(&exe_file
->f_path
);
1563 static const char *proc_pid_get_link(struct dentry
*dentry
,
1564 struct inode
*inode
,
1565 struct delayed_call
*done
)
1568 int error
= -EACCES
;
1571 return ERR_PTR(-ECHILD
);
1573 /* Are we allowed to snoop on the tasks file descriptors? */
1574 if (!proc_fd_access_allowed(inode
))
1577 error
= PROC_I(inode
)->op
.proc_get_link(dentry
, &path
);
1581 nd_jump_link(&path
);
1584 return ERR_PTR(error
);
1587 static int do_proc_readlink(struct path
*path
, char __user
*buffer
, int buflen
)
1589 char *tmp
= (char*)__get_free_page(GFP_TEMPORARY
);
1596 pathname
= d_path(path
, tmp
, PAGE_SIZE
);
1597 len
= PTR_ERR(pathname
);
1598 if (IS_ERR(pathname
))
1600 len
= tmp
+ PAGE_SIZE
- 1 - pathname
;
1604 if (copy_to_user(buffer
, pathname
, len
))
1607 free_page((unsigned long)tmp
);
1611 static int proc_pid_readlink(struct dentry
* dentry
, char __user
* buffer
, int buflen
)
1613 int error
= -EACCES
;
1614 struct inode
*inode
= d_inode(dentry
);
1617 /* Are we allowed to snoop on the tasks file descriptors? */
1618 if (!proc_fd_access_allowed(inode
))
1621 error
= PROC_I(inode
)->op
.proc_get_link(dentry
, &path
);
1625 error
= do_proc_readlink(&path
, buffer
, buflen
);
1631 const struct inode_operations proc_pid_link_inode_operations
= {
1632 .readlink
= proc_pid_readlink
,
1633 .get_link
= proc_pid_get_link
,
1634 .setattr
= proc_setattr
,
1638 /* building an inode */
1640 void task_dump_owner(struct task_struct
*task
, mode_t mode
,
1641 kuid_t
*ruid
, kgid_t
*rgid
)
1643 /* Depending on the state of dumpable compute who should own a
1644 * proc file for a task.
1646 const struct cred
*cred
;
1650 /* Default to the tasks effective ownership */
1652 cred
= __task_cred(task
);
1658 * Before the /proc/pid/status file was created the only way to read
1659 * the effective uid of a /process was to stat /proc/pid. Reading
1660 * /proc/pid/status is slow enough that procps and other packages
1661 * kept stating /proc/pid. To keep the rules in /proc simple I have
1662 * made this apply to all per process world readable and executable
1665 if (mode
!= (S_IFDIR
|S_IRUGO
|S_IXUGO
)) {
1666 struct mm_struct
*mm
;
1669 /* Make non-dumpable tasks owned by some root */
1671 if (get_dumpable(mm
) != SUID_DUMP_USER
) {
1672 struct user_namespace
*user_ns
= mm
->user_ns
;
1674 uid
= make_kuid(user_ns
, 0);
1675 if (!uid_valid(uid
))
1676 uid
= GLOBAL_ROOT_UID
;
1678 gid
= make_kgid(user_ns
, 0);
1679 if (!gid_valid(gid
))
1680 gid
= GLOBAL_ROOT_GID
;
1683 uid
= GLOBAL_ROOT_UID
;
1684 gid
= GLOBAL_ROOT_GID
;
1692 struct inode
*proc_pid_make_inode(struct super_block
* sb
,
1693 struct task_struct
*task
, umode_t mode
)
1695 struct inode
* inode
;
1696 struct proc_inode
*ei
;
1698 /* We need a new inode */
1700 inode
= new_inode(sb
);
1706 inode
->i_mode
= mode
;
1707 inode
->i_ino
= get_next_ino();
1708 inode
->i_mtime
= inode
->i_atime
= inode
->i_ctime
= current_time(inode
);
1709 inode
->i_op
= &proc_def_inode_operations
;
1712 * grab the reference to task.
1714 ei
->pid
= get_task_pid(task
, PIDTYPE_PID
);
1718 task_dump_owner(task
, 0, &inode
->i_uid
, &inode
->i_gid
);
1719 security_task_to_inode(task
, inode
);
1729 int pid_getattr(const struct path
*path
, struct kstat
*stat
,
1730 u32 request_mask
, unsigned int query_flags
)
1732 struct inode
*inode
= d_inode(path
->dentry
);
1733 struct task_struct
*task
;
1734 struct pid_namespace
*pid
= path
->dentry
->d_sb
->s_fs_info
;
1736 generic_fillattr(inode
, stat
);
1739 stat
->uid
= GLOBAL_ROOT_UID
;
1740 stat
->gid
= GLOBAL_ROOT_GID
;
1741 task
= pid_task(proc_pid(inode
), PIDTYPE_PID
);
1743 if (!has_pid_permissions(pid
, task
, HIDEPID_INVISIBLE
)) {
1746 * This doesn't prevent learning whether PID exists,
1747 * it only makes getattr() consistent with readdir().
1751 task_dump_owner(task
, inode
->i_mode
, &stat
->uid
, &stat
->gid
);
1760 * Exceptional case: normally we are not allowed to unhash a busy
1761 * directory. In this case, however, we can do it - no aliasing problems
1762 * due to the way we treat inodes.
1764 * Rewrite the inode's ownerships here because the owning task may have
1765 * performed a setuid(), etc.
1768 int pid_revalidate(struct dentry
*dentry
, unsigned int flags
)
1770 struct inode
*inode
;
1771 struct task_struct
*task
;
1773 if (flags
& LOOKUP_RCU
)
1776 inode
= d_inode(dentry
);
1777 task
= get_proc_task(inode
);
1780 task_dump_owner(task
, inode
->i_mode
, &inode
->i_uid
, &inode
->i_gid
);
1782 inode
->i_mode
&= ~(S_ISUID
| S_ISGID
);
1783 security_task_to_inode(task
, inode
);
1784 put_task_struct(task
);
1790 static inline bool proc_inode_is_dead(struct inode
*inode
)
1792 return !proc_pid(inode
)->tasks
[PIDTYPE_PID
].first
;
1795 int pid_delete_dentry(const struct dentry
*dentry
)
1797 /* Is the task we represent dead?
1798 * If so, then don't put the dentry on the lru list,
1799 * kill it immediately.
1801 return proc_inode_is_dead(d_inode(dentry
));
1804 const struct dentry_operations pid_dentry_operations
=
1806 .d_revalidate
= pid_revalidate
,
1807 .d_delete
= pid_delete_dentry
,
1813 * Fill a directory entry.
1815 * If possible create the dcache entry and derive our inode number and
1816 * file type from dcache entry.
1818 * Since all of the proc inode numbers are dynamically generated, the inode
1819 * numbers do not exist until the inode is cache. This means creating the
1820 * the dcache entry in readdir is necessary to keep the inode numbers
1821 * reported by readdir in sync with the inode numbers reported
1824 bool proc_fill_cache(struct file
*file
, struct dir_context
*ctx
,
1825 const char *name
, int len
,
1826 instantiate_t instantiate
, struct task_struct
*task
, const void *ptr
)
1828 struct dentry
*child
, *dir
= file
->f_path
.dentry
;
1829 struct qstr qname
= QSTR_INIT(name
, len
);
1830 struct inode
*inode
;
1834 child
= d_hash_and_lookup(dir
, &qname
);
1836 DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq
);
1837 child
= d_alloc_parallel(dir
, &qname
, &wq
);
1839 goto end_instantiate
;
1840 if (d_in_lookup(child
)) {
1841 int err
= instantiate(d_inode(dir
), child
, task
, ptr
);
1842 d_lookup_done(child
);
1845 goto end_instantiate
;
1849 inode
= d_inode(child
);
1851 type
= inode
->i_mode
>> 12;
1853 return dir_emit(ctx
, name
, len
, ino
, type
);
1856 return dir_emit(ctx
, name
, len
, 1, DT_UNKNOWN
);
1860 * dname_to_vma_addr - maps a dentry name into two unsigned longs
1861 * which represent vma start and end addresses.
1863 static int dname_to_vma_addr(struct dentry
*dentry
,
1864 unsigned long *start
, unsigned long *end
)
1866 if (sscanf(dentry
->d_name
.name
, "%lx-%lx", start
, end
) != 2)
1872 static int map_files_d_revalidate(struct dentry
*dentry
, unsigned int flags
)
1874 unsigned long vm_start
, vm_end
;
1875 bool exact_vma_exists
= false;
1876 struct mm_struct
*mm
= NULL
;
1877 struct task_struct
*task
;
1878 struct inode
*inode
;
1881 if (flags
& LOOKUP_RCU
)
1884 inode
= d_inode(dentry
);
1885 task
= get_proc_task(inode
);
1889 mm
= mm_access(task
, PTRACE_MODE_READ_FSCREDS
);
1890 if (IS_ERR_OR_NULL(mm
))
1893 if (!dname_to_vma_addr(dentry
, &vm_start
, &vm_end
)) {
1894 down_read(&mm
->mmap_sem
);
1895 exact_vma_exists
= !!find_exact_vma(mm
, vm_start
, vm_end
);
1896 up_read(&mm
->mmap_sem
);
1901 if (exact_vma_exists
) {
1902 task_dump_owner(task
, 0, &inode
->i_uid
, &inode
->i_gid
);
1904 security_task_to_inode(task
, inode
);
1909 put_task_struct(task
);
1915 static const struct dentry_operations tid_map_files_dentry_operations
= {
1916 .d_revalidate
= map_files_d_revalidate
,
1917 .d_delete
= pid_delete_dentry
,
1920 static int map_files_get_link(struct dentry
*dentry
, struct path
*path
)
1922 unsigned long vm_start
, vm_end
;
1923 struct vm_area_struct
*vma
;
1924 struct task_struct
*task
;
1925 struct mm_struct
*mm
;
1929 task
= get_proc_task(d_inode(dentry
));
1933 mm
= get_task_mm(task
);
1934 put_task_struct(task
);
1938 rc
= dname_to_vma_addr(dentry
, &vm_start
, &vm_end
);
1943 down_read(&mm
->mmap_sem
);
1944 vma
= find_exact_vma(mm
, vm_start
, vm_end
);
1945 if (vma
&& vma
->vm_file
) {
1946 *path
= vma
->vm_file
->f_path
;
1950 up_read(&mm
->mmap_sem
);
1958 struct map_files_info
{
1961 unsigned char name
[4*sizeof(long)+2]; /* max: %lx-%lx\0 */
1965 * Only allow CAP_SYS_ADMIN to follow the links, due to concerns about how the
1966 * symlinks may be used to bypass permissions on ancestor directories in the
1967 * path to the file in question.
1970 proc_map_files_get_link(struct dentry
*dentry
,
1971 struct inode
*inode
,
1972 struct delayed_call
*done
)
1974 if (!capable(CAP_SYS_ADMIN
))
1975 return ERR_PTR(-EPERM
);
1977 return proc_pid_get_link(dentry
, inode
, done
);
1981 * Identical to proc_pid_link_inode_operations except for get_link()
1983 static const struct inode_operations proc_map_files_link_inode_operations
= {
1984 .readlink
= proc_pid_readlink
,
1985 .get_link
= proc_map_files_get_link
,
1986 .setattr
= proc_setattr
,
1990 proc_map_files_instantiate(struct inode
*dir
, struct dentry
*dentry
,
1991 struct task_struct
*task
, const void *ptr
)
1993 fmode_t mode
= (fmode_t
)(unsigned long)ptr
;
1994 struct proc_inode
*ei
;
1995 struct inode
*inode
;
1997 inode
= proc_pid_make_inode(dir
->i_sb
, task
, S_IFLNK
|
1998 ((mode
& FMODE_READ
) ? S_IRUSR
: 0) |
1999 ((mode
& FMODE_WRITE
) ? S_IWUSR
: 0));
2004 ei
->op
.proc_get_link
= map_files_get_link
;
2006 inode
->i_op
= &proc_map_files_link_inode_operations
;
2009 d_set_d_op(dentry
, &tid_map_files_dentry_operations
);
2010 d_add(dentry
, inode
);
2015 static struct dentry
*proc_map_files_lookup(struct inode
*dir
,
2016 struct dentry
*dentry
, unsigned int flags
)
2018 unsigned long vm_start
, vm_end
;
2019 struct vm_area_struct
*vma
;
2020 struct task_struct
*task
;
2022 struct mm_struct
*mm
;
2025 task
= get_proc_task(dir
);
2030 if (!ptrace_may_access(task
, PTRACE_MODE_READ_FSCREDS
))
2034 if (dname_to_vma_addr(dentry
, &vm_start
, &vm_end
))
2037 mm
= get_task_mm(task
);
2041 down_read(&mm
->mmap_sem
);
2042 vma
= find_exact_vma(mm
, vm_start
, vm_end
);
2047 result
= proc_map_files_instantiate(dir
, dentry
, task
,
2048 (void *)(unsigned long)vma
->vm_file
->f_mode
);
2051 up_read(&mm
->mmap_sem
);
2054 put_task_struct(task
);
2056 return ERR_PTR(result
);
2059 static const struct inode_operations proc_map_files_inode_operations
= {
2060 .lookup
= proc_map_files_lookup
,
2061 .permission
= proc_fd_permission
,
2062 .setattr
= proc_setattr
,
2066 proc_map_files_readdir(struct file
*file
, struct dir_context
*ctx
)
2068 struct vm_area_struct
*vma
;
2069 struct task_struct
*task
;
2070 struct mm_struct
*mm
;
2071 unsigned long nr_files
, pos
, i
;
2072 struct flex_array
*fa
= NULL
;
2073 struct map_files_info info
;
2074 struct map_files_info
*p
;
2078 task
= get_proc_task(file_inode(file
));
2083 if (!ptrace_may_access(task
, PTRACE_MODE_READ_FSCREDS
))
2087 if (!dir_emit_dots(file
, ctx
))
2090 mm
= get_task_mm(task
);
2093 down_read(&mm
->mmap_sem
);
2098 * We need two passes here:
2100 * 1) Collect vmas of mapped files with mmap_sem taken
2101 * 2) Release mmap_sem and instantiate entries
2103 * otherwise we get lockdep complained, since filldir()
2104 * routine might require mmap_sem taken in might_fault().
2107 for (vma
= mm
->mmap
, pos
= 2; vma
; vma
= vma
->vm_next
) {
2108 if (vma
->vm_file
&& ++pos
> ctx
->pos
)
2113 fa
= flex_array_alloc(sizeof(info
), nr_files
,
2115 if (!fa
|| flex_array_prealloc(fa
, 0, nr_files
,
2119 flex_array_free(fa
);
2120 up_read(&mm
->mmap_sem
);
2124 for (i
= 0, vma
= mm
->mmap
, pos
= 2; vma
;
2125 vma
= vma
->vm_next
) {
2128 if (++pos
<= ctx
->pos
)
2131 info
.mode
= vma
->vm_file
->f_mode
;
2132 info
.len
= snprintf(info
.name
,
2133 sizeof(info
.name
), "%lx-%lx",
2134 vma
->vm_start
, vma
->vm_end
);
2135 if (flex_array_put(fa
, i
++, &info
, GFP_KERNEL
))
2139 up_read(&mm
->mmap_sem
);
2141 for (i
= 0; i
< nr_files
; i
++) {
2142 p
= flex_array_get(fa
, i
);
2143 if (!proc_fill_cache(file
, ctx
,
2145 proc_map_files_instantiate
,
2147 (void *)(unsigned long)p
->mode
))
2152 flex_array_free(fa
);
2156 put_task_struct(task
);
2161 static const struct file_operations proc_map_files_operations
= {
2162 .read
= generic_read_dir
,
2163 .iterate_shared
= proc_map_files_readdir
,
2164 .llseek
= generic_file_llseek
,
2167 #if defined(CONFIG_CHECKPOINT_RESTORE) && defined(CONFIG_POSIX_TIMERS)
2168 struct timers_private
{
2170 struct task_struct
*task
;
2171 struct sighand_struct
*sighand
;
2172 struct pid_namespace
*ns
;
2173 unsigned long flags
;
2176 static void *timers_start(struct seq_file
*m
, loff_t
*pos
)
2178 struct timers_private
*tp
= m
->private;
2180 tp
->task
= get_pid_task(tp
->pid
, PIDTYPE_PID
);
2182 return ERR_PTR(-ESRCH
);
2184 tp
->sighand
= lock_task_sighand(tp
->task
, &tp
->flags
);
2186 return ERR_PTR(-ESRCH
);
2188 return seq_list_start(&tp
->task
->signal
->posix_timers
, *pos
);
2191 static void *timers_next(struct seq_file
*m
, void *v
, loff_t
*pos
)
2193 struct timers_private
*tp
= m
->private;
2194 return seq_list_next(v
, &tp
->task
->signal
->posix_timers
, pos
);
2197 static void timers_stop(struct seq_file
*m
, void *v
)
2199 struct timers_private
*tp
= m
->private;
2202 unlock_task_sighand(tp
->task
, &tp
->flags
);
2207 put_task_struct(tp
->task
);
2212 static int show_timer(struct seq_file
*m
, void *v
)
2214 struct k_itimer
*timer
;
2215 struct timers_private
*tp
= m
->private;
2217 static const char * const nstr
[] = {
2218 [SIGEV_SIGNAL
] = "signal",
2219 [SIGEV_NONE
] = "none",
2220 [SIGEV_THREAD
] = "thread",
2223 timer
= list_entry((struct list_head
*)v
, struct k_itimer
, list
);
2224 notify
= timer
->it_sigev_notify
;
2226 seq_printf(m
, "ID: %d\n", timer
->it_id
);
2227 seq_printf(m
, "signal: %d/%p\n",
2228 timer
->sigq
->info
.si_signo
,
2229 timer
->sigq
->info
.si_value
.sival_ptr
);
2230 seq_printf(m
, "notify: %s/%s.%d\n",
2231 nstr
[notify
& ~SIGEV_THREAD_ID
],
2232 (notify
& SIGEV_THREAD_ID
) ? "tid" : "pid",
2233 pid_nr_ns(timer
->it_pid
, tp
->ns
));
2234 seq_printf(m
, "ClockID: %d\n", timer
->it_clock
);
2239 static const struct seq_operations proc_timers_seq_ops
= {
2240 .start
= timers_start
,
2241 .next
= timers_next
,
2242 .stop
= timers_stop
,
2246 static int proc_timers_open(struct inode
*inode
, struct file
*file
)
2248 struct timers_private
*tp
;
2250 tp
= __seq_open_private(file
, &proc_timers_seq_ops
,
2251 sizeof(struct timers_private
));
2255 tp
->pid
= proc_pid(inode
);
2256 tp
->ns
= inode
->i_sb
->s_fs_info
;
2260 static const struct file_operations proc_timers_operations
= {
2261 .open
= proc_timers_open
,
2263 .llseek
= seq_lseek
,
2264 .release
= seq_release_private
,
2268 static ssize_t
timerslack_ns_write(struct file
*file
, const char __user
*buf
,
2269 size_t count
, loff_t
*offset
)
2271 struct inode
*inode
= file_inode(file
);
2272 struct task_struct
*p
;
2276 err
= kstrtoull_from_user(buf
, count
, 10, &slack_ns
);
2280 p
= get_proc_task(inode
);
2285 if (!capable(CAP_SYS_NICE
)) {
2290 err
= security_task_setscheduler(p
);
2299 p
->timer_slack_ns
= p
->default_timer_slack_ns
;
2301 p
->timer_slack_ns
= slack_ns
;
2310 static int timerslack_ns_show(struct seq_file
*m
, void *v
)
2312 struct inode
*inode
= m
->private;
2313 struct task_struct
*p
;
2316 p
= get_proc_task(inode
);
2322 if (!capable(CAP_SYS_NICE
)) {
2326 err
= security_task_getscheduler(p
);
2332 seq_printf(m
, "%llu\n", p
->timer_slack_ns
);
2341 static int timerslack_ns_open(struct inode
*inode
, struct file
*filp
)
2343 return single_open(filp
, timerslack_ns_show
, inode
);
2346 static const struct file_operations proc_pid_set_timerslack_ns_operations
= {
2347 .open
= timerslack_ns_open
,
2349 .write
= timerslack_ns_write
,
2350 .llseek
= seq_lseek
,
2351 .release
= single_release
,
2354 static int proc_pident_instantiate(struct inode
*dir
,
2355 struct dentry
*dentry
, struct task_struct
*task
, const void *ptr
)
2357 const struct pid_entry
*p
= ptr
;
2358 struct inode
*inode
;
2359 struct proc_inode
*ei
;
2361 inode
= proc_pid_make_inode(dir
->i_sb
, task
, p
->mode
);
2366 if (S_ISDIR(inode
->i_mode
))
2367 set_nlink(inode
, 2); /* Use getattr to fix if necessary */
2369 inode
->i_op
= p
->iop
;
2371 inode
->i_fop
= p
->fop
;
2373 d_set_d_op(dentry
, &pid_dentry_operations
);
2374 d_add(dentry
, inode
);
2375 /* Close the race of the process dying before we return the dentry */
2376 if (pid_revalidate(dentry
, 0))
2382 static struct dentry
*proc_pident_lookup(struct inode
*dir
,
2383 struct dentry
*dentry
,
2384 const struct pid_entry
*ents
,
2388 struct task_struct
*task
= get_proc_task(dir
);
2389 const struct pid_entry
*p
, *last
;
2397 * Yes, it does not scale. And it should not. Don't add
2398 * new entries into /proc/<tgid>/ without very good reasons.
2400 last
= &ents
[nents
];
2401 for (p
= ents
; p
< last
; p
++) {
2402 if (p
->len
!= dentry
->d_name
.len
)
2404 if (!memcmp(dentry
->d_name
.name
, p
->name
, p
->len
))
2410 error
= proc_pident_instantiate(dir
, dentry
, task
, p
);
2412 put_task_struct(task
);
2414 return ERR_PTR(error
);
2417 static int proc_pident_readdir(struct file
*file
, struct dir_context
*ctx
,
2418 const struct pid_entry
*ents
, unsigned int nents
)
2420 struct task_struct
*task
= get_proc_task(file_inode(file
));
2421 const struct pid_entry
*p
;
2426 if (!dir_emit_dots(file
, ctx
))
2429 if (ctx
->pos
>= nents
+ 2)
2432 for (p
= ents
+ (ctx
->pos
- 2); p
< ents
+ nents
; p
++) {
2433 if (!proc_fill_cache(file
, ctx
, p
->name
, p
->len
,
2434 proc_pident_instantiate
, task
, p
))
2439 put_task_struct(task
);
2443 #ifdef CONFIG_SECURITY
2444 static ssize_t
proc_pid_attr_read(struct file
* file
, char __user
* buf
,
2445 size_t count
, loff_t
*ppos
)
2447 struct inode
* inode
= file_inode(file
);
2450 struct task_struct
*task
= get_proc_task(inode
);
2455 length
= security_getprocattr(task
,
2456 (char*)file
->f_path
.dentry
->d_name
.name
,
2458 put_task_struct(task
);
2460 length
= simple_read_from_buffer(buf
, count
, ppos
, p
, length
);
2465 static ssize_t
proc_pid_attr_write(struct file
* file
, const char __user
* buf
,
2466 size_t count
, loff_t
*ppos
)
2468 struct inode
* inode
= file_inode(file
);
2471 struct task_struct
*task
= get_proc_task(inode
);
2477 /* A task may only write its own attributes. */
2479 if (current
!= task
)
2482 if (count
> PAGE_SIZE
)
2485 /* No partial writes. */
2490 page
= memdup_user(buf
, count
);
2492 length
= PTR_ERR(page
);
2496 /* Guard against adverse ptrace interaction */
2497 length
= mutex_lock_interruptible(¤t
->signal
->cred_guard_mutex
);
2501 length
= security_setprocattr(file
->f_path
.dentry
->d_name
.name
,
2503 mutex_unlock(¤t
->signal
->cred_guard_mutex
);
2507 put_task_struct(task
);
2512 static const struct file_operations proc_pid_attr_operations
= {
2513 .read
= proc_pid_attr_read
,
2514 .write
= proc_pid_attr_write
,
2515 .llseek
= generic_file_llseek
,
2518 static const struct pid_entry attr_dir_stuff
[] = {
2519 REG("current", S_IRUGO
|S_IWUGO
, proc_pid_attr_operations
),
2520 REG("prev", S_IRUGO
, proc_pid_attr_operations
),
2521 REG("exec", S_IRUGO
|S_IWUGO
, proc_pid_attr_operations
),
2522 REG("fscreate", S_IRUGO
|S_IWUGO
, proc_pid_attr_operations
),
2523 REG("keycreate", S_IRUGO
|S_IWUGO
, proc_pid_attr_operations
),
2524 REG("sockcreate", S_IRUGO
|S_IWUGO
, proc_pid_attr_operations
),
2527 static int proc_attr_dir_readdir(struct file
*file
, struct dir_context
*ctx
)
2529 return proc_pident_readdir(file
, ctx
,
2530 attr_dir_stuff
, ARRAY_SIZE(attr_dir_stuff
));
2533 static const struct file_operations proc_attr_dir_operations
= {
2534 .read
= generic_read_dir
,
2535 .iterate_shared
= proc_attr_dir_readdir
,
2536 .llseek
= generic_file_llseek
,
2539 static struct dentry
*proc_attr_dir_lookup(struct inode
*dir
,
2540 struct dentry
*dentry
, unsigned int flags
)
2542 return proc_pident_lookup(dir
, dentry
,
2543 attr_dir_stuff
, ARRAY_SIZE(attr_dir_stuff
));
2546 static const struct inode_operations proc_attr_dir_inode_operations
= {
2547 .lookup
= proc_attr_dir_lookup
,
2548 .getattr
= pid_getattr
,
2549 .setattr
= proc_setattr
,
2554 #ifdef CONFIG_ELF_CORE
2555 static ssize_t
proc_coredump_filter_read(struct file
*file
, char __user
*buf
,
2556 size_t count
, loff_t
*ppos
)
2558 struct task_struct
*task
= get_proc_task(file_inode(file
));
2559 struct mm_struct
*mm
;
2560 char buffer
[PROC_NUMBUF
];
2568 mm
= get_task_mm(task
);
2570 len
= snprintf(buffer
, sizeof(buffer
), "%08lx\n",
2571 ((mm
->flags
& MMF_DUMP_FILTER_MASK
) >>
2572 MMF_DUMP_FILTER_SHIFT
));
2574 ret
= simple_read_from_buffer(buf
, count
, ppos
, buffer
, len
);
2577 put_task_struct(task
);
2582 static ssize_t
proc_coredump_filter_write(struct file
*file
,
2583 const char __user
*buf
,
2587 struct task_struct
*task
;
2588 struct mm_struct
*mm
;
2594 ret
= kstrtouint_from_user(buf
, count
, 0, &val
);
2599 task
= get_proc_task(file_inode(file
));
2603 mm
= get_task_mm(task
);
2608 for (i
= 0, mask
= 1; i
< MMF_DUMP_FILTER_BITS
; i
++, mask
<<= 1) {
2610 set_bit(i
+ MMF_DUMP_FILTER_SHIFT
, &mm
->flags
);
2612 clear_bit(i
+ MMF_DUMP_FILTER_SHIFT
, &mm
->flags
);
2617 put_task_struct(task
);
2624 static const struct file_operations proc_coredump_filter_operations
= {
2625 .read
= proc_coredump_filter_read
,
2626 .write
= proc_coredump_filter_write
,
2627 .llseek
= generic_file_llseek
,
2631 #ifdef CONFIG_TASK_IO_ACCOUNTING
2632 static int do_io_accounting(struct task_struct
*task
, struct seq_file
*m
, int whole
)
2634 struct task_io_accounting acct
= task
->ioac
;
2635 unsigned long flags
;
2638 result
= mutex_lock_killable(&task
->signal
->cred_guard_mutex
);
2642 if (!ptrace_may_access(task
, PTRACE_MODE_READ_FSCREDS
)) {
2647 if (whole
&& lock_task_sighand(task
, &flags
)) {
2648 struct task_struct
*t
= task
;
2650 task_io_accounting_add(&acct
, &task
->signal
->ioac
);
2651 while_each_thread(task
, t
)
2652 task_io_accounting_add(&acct
, &t
->ioac
);
2654 unlock_task_sighand(task
, &flags
);
2661 "read_bytes: %llu\n"
2662 "write_bytes: %llu\n"
2663 "cancelled_write_bytes: %llu\n",
2664 (unsigned long long)acct
.rchar
,
2665 (unsigned long long)acct
.wchar
,
2666 (unsigned long long)acct
.syscr
,
2667 (unsigned long long)acct
.syscw
,
2668 (unsigned long long)acct
.read_bytes
,
2669 (unsigned long long)acct
.write_bytes
,
2670 (unsigned long long)acct
.cancelled_write_bytes
);
2674 mutex_unlock(&task
->signal
->cred_guard_mutex
);
2678 static int proc_tid_io_accounting(struct seq_file
*m
, struct pid_namespace
*ns
,
2679 struct pid
*pid
, struct task_struct
*task
)
2681 return do_io_accounting(task
, m
, 0);
2684 static int proc_tgid_io_accounting(struct seq_file
*m
, struct pid_namespace
*ns
,
2685 struct pid
*pid
, struct task_struct
*task
)
2687 return do_io_accounting(task
, m
, 1);
2689 #endif /* CONFIG_TASK_IO_ACCOUNTING */
2691 #ifdef CONFIG_USER_NS
2692 static int proc_id_map_open(struct inode
*inode
, struct file
*file
,
2693 const struct seq_operations
*seq_ops
)
2695 struct user_namespace
*ns
= NULL
;
2696 struct task_struct
*task
;
2697 struct seq_file
*seq
;
2700 task
= get_proc_task(inode
);
2703 ns
= get_user_ns(task_cred_xxx(task
, user_ns
));
2705 put_task_struct(task
);
2710 ret
= seq_open(file
, seq_ops
);
2714 seq
= file
->private_data
;
2724 static int proc_id_map_release(struct inode
*inode
, struct file
*file
)
2726 struct seq_file
*seq
= file
->private_data
;
2727 struct user_namespace
*ns
= seq
->private;
2729 return seq_release(inode
, file
);
2732 static int proc_uid_map_open(struct inode
*inode
, struct file
*file
)
2734 return proc_id_map_open(inode
, file
, &proc_uid_seq_operations
);
2737 static int proc_gid_map_open(struct inode
*inode
, struct file
*file
)
2739 return proc_id_map_open(inode
, file
, &proc_gid_seq_operations
);
2742 static int proc_projid_map_open(struct inode
*inode
, struct file
*file
)
2744 return proc_id_map_open(inode
, file
, &proc_projid_seq_operations
);
2747 static const struct file_operations proc_uid_map_operations
= {
2748 .open
= proc_uid_map_open
,
2749 .write
= proc_uid_map_write
,
2751 .llseek
= seq_lseek
,
2752 .release
= proc_id_map_release
,
2755 static const struct file_operations proc_gid_map_operations
= {
2756 .open
= proc_gid_map_open
,
2757 .write
= proc_gid_map_write
,
2759 .llseek
= seq_lseek
,
2760 .release
= proc_id_map_release
,
2763 static const struct file_operations proc_projid_map_operations
= {
2764 .open
= proc_projid_map_open
,
2765 .write
= proc_projid_map_write
,
2767 .llseek
= seq_lseek
,
2768 .release
= proc_id_map_release
,
2771 static int proc_setgroups_open(struct inode
*inode
, struct file
*file
)
2773 struct user_namespace
*ns
= NULL
;
2774 struct task_struct
*task
;
2778 task
= get_proc_task(inode
);
2781 ns
= get_user_ns(task_cred_xxx(task
, user_ns
));
2783 put_task_struct(task
);
2788 if (file
->f_mode
& FMODE_WRITE
) {
2790 if (!ns_capable(ns
, CAP_SYS_ADMIN
))
2794 ret
= single_open(file
, &proc_setgroups_show
, ns
);
2805 static int proc_setgroups_release(struct inode
*inode
, struct file
*file
)
2807 struct seq_file
*seq
= file
->private_data
;
2808 struct user_namespace
*ns
= seq
->private;
2809 int ret
= single_release(inode
, file
);
2814 static const struct file_operations proc_setgroups_operations
= {
2815 .open
= proc_setgroups_open
,
2816 .write
= proc_setgroups_write
,
2818 .llseek
= seq_lseek
,
2819 .release
= proc_setgroups_release
,
2821 #endif /* CONFIG_USER_NS */
2823 static int proc_pid_personality(struct seq_file
*m
, struct pid_namespace
*ns
,
2824 struct pid
*pid
, struct task_struct
*task
)
2826 int err
= lock_trace(task
);
2828 seq_printf(m
, "%08x\n", task
->personality
);
2834 #ifdef CONFIG_LIVEPATCH
2835 static int proc_pid_patch_state(struct seq_file
*m
, struct pid_namespace
*ns
,
2836 struct pid
*pid
, struct task_struct
*task
)
2838 seq_printf(m
, "%d\n", task
->patch_state
);
2841 #endif /* CONFIG_LIVEPATCH */
2846 static const struct file_operations proc_task_operations
;
2847 static const struct inode_operations proc_task_inode_operations
;
2849 static const struct pid_entry tgid_base_stuff
[] = {
2850 DIR("task", S_IRUGO
|S_IXUGO
, proc_task_inode_operations
, proc_task_operations
),
2851 DIR("fd", S_IRUSR
|S_IXUSR
, proc_fd_inode_operations
, proc_fd_operations
),
2852 DIR("map_files", S_IRUSR
|S_IXUSR
, proc_map_files_inode_operations
, proc_map_files_operations
),
2853 DIR("fdinfo", S_IRUSR
|S_IXUSR
, proc_fdinfo_inode_operations
, proc_fdinfo_operations
),
2854 DIR("ns", S_IRUSR
|S_IXUGO
, proc_ns_dir_inode_operations
, proc_ns_dir_operations
),
2856 DIR("net", S_IRUGO
|S_IXUGO
, proc_net_inode_operations
, proc_net_operations
),
2858 REG("environ", S_IRUSR
, proc_environ_operations
),
2859 REG("auxv", S_IRUSR
, proc_auxv_operations
),
2860 ONE("status", S_IRUGO
, proc_pid_status
),
2861 ONE("personality", S_IRUSR
, proc_pid_personality
),
2862 ONE("limits", S_IRUGO
, proc_pid_limits
),
2863 #ifdef CONFIG_SCHED_DEBUG
2864 REG("sched", S_IRUGO
|S_IWUSR
, proc_pid_sched_operations
),
2866 #ifdef CONFIG_SCHED_AUTOGROUP
2867 REG("autogroup", S_IRUGO
|S_IWUSR
, proc_pid_sched_autogroup_operations
),
2869 REG("comm", S_IRUGO
|S_IWUSR
, proc_pid_set_comm_operations
),
2870 #ifdef CONFIG_HAVE_ARCH_TRACEHOOK
2871 ONE("syscall", S_IRUSR
, proc_pid_syscall
),
2873 REG("cmdline", S_IRUGO
, proc_pid_cmdline_ops
),
2874 ONE("stat", S_IRUGO
, proc_tgid_stat
),
2875 ONE("statm", S_IRUGO
, proc_pid_statm
),
2876 REG("maps", S_IRUGO
, proc_pid_maps_operations
),
2878 REG("numa_maps", S_IRUGO
, proc_pid_numa_maps_operations
),
2880 REG("mem", S_IRUSR
|S_IWUSR
, proc_mem_operations
),
2881 LNK("cwd", proc_cwd_link
),
2882 LNK("root", proc_root_link
),
2883 LNK("exe", proc_exe_link
),
2884 REG("mounts", S_IRUGO
, proc_mounts_operations
),
2885 REG("mountinfo", S_IRUGO
, proc_mountinfo_operations
),
2886 REG("mountstats", S_IRUSR
, proc_mountstats_operations
),
2887 #ifdef CONFIG_PROC_PAGE_MONITOR
2888 REG("clear_refs", S_IWUSR
, proc_clear_refs_operations
),
2889 REG("smaps", S_IRUGO
, proc_pid_smaps_operations
),
2890 REG("pagemap", S_IRUSR
, proc_pagemap_operations
),
2892 #ifdef CONFIG_SECURITY
2893 DIR("attr", S_IRUGO
|S_IXUGO
, proc_attr_dir_inode_operations
, proc_attr_dir_operations
),
2895 #ifdef CONFIG_KALLSYMS
2896 ONE("wchan", S_IRUGO
, proc_pid_wchan
),
2898 #ifdef CONFIG_STACKTRACE
2899 ONE("stack", S_IRUSR
, proc_pid_stack
),
2901 #ifdef CONFIG_SCHED_INFO
2902 ONE("schedstat", S_IRUGO
, proc_pid_schedstat
),
2904 #ifdef CONFIG_LATENCYTOP
2905 REG("latency", S_IRUGO
, proc_lstats_operations
),
2907 #ifdef CONFIG_PROC_PID_CPUSET
2908 ONE("cpuset", S_IRUGO
, proc_cpuset_show
),
2910 #ifdef CONFIG_CGROUPS
2911 ONE("cgroup", S_IRUGO
, proc_cgroup_show
),
2913 ONE("oom_score", S_IRUGO
, proc_oom_score
),
2914 REG("oom_adj", S_IRUGO
|S_IWUSR
, proc_oom_adj_operations
),
2915 REG("oom_score_adj", S_IRUGO
|S_IWUSR
, proc_oom_score_adj_operations
),
2916 #ifdef CONFIG_AUDITSYSCALL
2917 REG("loginuid", S_IWUSR
|S_IRUGO
, proc_loginuid_operations
),
2918 REG("sessionid", S_IRUGO
, proc_sessionid_operations
),
2920 #ifdef CONFIG_FAULT_INJECTION
2921 REG("make-it-fail", S_IRUGO
|S_IWUSR
, proc_fault_inject_operations
),
2923 #ifdef CONFIG_ELF_CORE
2924 REG("coredump_filter", S_IRUGO
|S_IWUSR
, proc_coredump_filter_operations
),
2926 #ifdef CONFIG_TASK_IO_ACCOUNTING
2927 ONE("io", S_IRUSR
, proc_tgid_io_accounting
),
2929 #ifdef CONFIG_HARDWALL
2930 ONE("hardwall", S_IRUGO
, proc_pid_hardwall
),
2932 #ifdef CONFIG_USER_NS
2933 REG("uid_map", S_IRUGO
|S_IWUSR
, proc_uid_map_operations
),
2934 REG("gid_map", S_IRUGO
|S_IWUSR
, proc_gid_map_operations
),
2935 REG("projid_map", S_IRUGO
|S_IWUSR
, proc_projid_map_operations
),
2936 REG("setgroups", S_IRUGO
|S_IWUSR
, proc_setgroups_operations
),
2938 #if defined(CONFIG_CHECKPOINT_RESTORE) && defined(CONFIG_POSIX_TIMERS)
2939 REG("timers", S_IRUGO
, proc_timers_operations
),
2941 REG("timerslack_ns", S_IRUGO
|S_IWUGO
, proc_pid_set_timerslack_ns_operations
),
2942 #ifdef CONFIG_LIVEPATCH
2943 ONE("patch_state", S_IRUSR
, proc_pid_patch_state
),
2947 static int proc_tgid_base_readdir(struct file
*file
, struct dir_context
*ctx
)
2949 return proc_pident_readdir(file
, ctx
,
2950 tgid_base_stuff
, ARRAY_SIZE(tgid_base_stuff
));
2953 static const struct file_operations proc_tgid_base_operations
= {
2954 .read
= generic_read_dir
,
2955 .iterate_shared
= proc_tgid_base_readdir
,
2956 .llseek
= generic_file_llseek
,
2959 static struct dentry
*proc_tgid_base_lookup(struct inode
*dir
, struct dentry
*dentry
, unsigned int flags
)
2961 return proc_pident_lookup(dir
, dentry
,
2962 tgid_base_stuff
, ARRAY_SIZE(tgid_base_stuff
));
2965 static const struct inode_operations proc_tgid_base_inode_operations
= {
2966 .lookup
= proc_tgid_base_lookup
,
2967 .getattr
= pid_getattr
,
2968 .setattr
= proc_setattr
,
2969 .permission
= proc_pid_permission
,
2972 static void proc_flush_task_mnt(struct vfsmount
*mnt
, pid_t pid
, pid_t tgid
)
2974 struct dentry
*dentry
, *leader
, *dir
;
2975 char buf
[PROC_NUMBUF
];
2979 name
.len
= snprintf(buf
, sizeof(buf
), "%d", pid
);
2980 /* no ->d_hash() rejects on procfs */
2981 dentry
= d_hash_and_lookup(mnt
->mnt_root
, &name
);
2983 d_invalidate(dentry
);
2991 name
.len
= snprintf(buf
, sizeof(buf
), "%d", tgid
);
2992 leader
= d_hash_and_lookup(mnt
->mnt_root
, &name
);
2997 name
.len
= strlen(name
.name
);
2998 dir
= d_hash_and_lookup(leader
, &name
);
3000 goto out_put_leader
;
3003 name
.len
= snprintf(buf
, sizeof(buf
), "%d", pid
);
3004 dentry
= d_hash_and_lookup(dir
, &name
);
3006 d_invalidate(dentry
);
3018 * proc_flush_task - Remove dcache entries for @task from the /proc dcache.
3019 * @task: task that should be flushed.
3021 * When flushing dentries from proc, one needs to flush them from global
3022 * proc (proc_mnt) and from all the namespaces' procs this task was seen
3023 * in. This call is supposed to do all of this job.
3025 * Looks in the dcache for
3027 * /proc/@tgid/task/@pid
3028 * if either directory is present flushes it and all of it'ts children
3031 * It is safe and reasonable to cache /proc entries for a task until
3032 * that task exits. After that they just clog up the dcache with
3033 * useless entries, possibly causing useful dcache entries to be
3034 * flushed instead. This routine is proved to flush those useless
3035 * dcache entries at process exit time.
3037 * NOTE: This routine is just an optimization so it does not guarantee
3038 * that no dcache entries will exist at process exit time it
3039 * just makes it very unlikely that any will persist.
3042 void proc_flush_task(struct task_struct
*task
)
3045 struct pid
*pid
, *tgid
;
3048 pid
= task_pid(task
);
3049 tgid
= task_tgid(task
);
3051 for (i
= 0; i
<= pid
->level
; i
++) {
3052 upid
= &pid
->numbers
[i
];
3053 proc_flush_task_mnt(upid
->ns
->proc_mnt
, upid
->nr
,
3054 tgid
->numbers
[i
].nr
);
3058 static int proc_pid_instantiate(struct inode
*dir
,
3059 struct dentry
* dentry
,
3060 struct task_struct
*task
, const void *ptr
)
3062 struct inode
*inode
;
3064 inode
= proc_pid_make_inode(dir
->i_sb
, task
, S_IFDIR
| S_IRUGO
| S_IXUGO
);
3068 inode
->i_op
= &proc_tgid_base_inode_operations
;
3069 inode
->i_fop
= &proc_tgid_base_operations
;
3070 inode
->i_flags
|=S_IMMUTABLE
;
3072 set_nlink(inode
, nlink_tgid
);
3074 d_set_d_op(dentry
, &pid_dentry_operations
);
3076 d_add(dentry
, inode
);
3077 /* Close the race of the process dying before we return the dentry */
3078 if (pid_revalidate(dentry
, 0))
3084 struct dentry
*proc_pid_lookup(struct inode
*dir
, struct dentry
* dentry
, unsigned int flags
)
3086 int result
= -ENOENT
;
3087 struct task_struct
*task
;
3089 struct pid_namespace
*ns
;
3091 tgid
= name_to_int(&dentry
->d_name
);
3095 ns
= dentry
->d_sb
->s_fs_info
;
3097 task
= find_task_by_pid_ns(tgid
, ns
);
3099 get_task_struct(task
);
3104 result
= proc_pid_instantiate(dir
, dentry
, task
, NULL
);
3105 put_task_struct(task
);
3107 return ERR_PTR(result
);
3111 * Find the first task with tgid >= tgid
3116 struct task_struct
*task
;
3118 static struct tgid_iter
next_tgid(struct pid_namespace
*ns
, struct tgid_iter iter
)
3123 put_task_struct(iter
.task
);
3127 pid
= find_ge_pid(iter
.tgid
, ns
);
3129 iter
.tgid
= pid_nr_ns(pid
, ns
);
3130 iter
.task
= pid_task(pid
, PIDTYPE_PID
);
3131 /* What we to know is if the pid we have find is the
3132 * pid of a thread_group_leader. Testing for task
3133 * being a thread_group_leader is the obvious thing
3134 * todo but there is a window when it fails, due to
3135 * the pid transfer logic in de_thread.
3137 * So we perform the straight forward test of seeing
3138 * if the pid we have found is the pid of a thread
3139 * group leader, and don't worry if the task we have
3140 * found doesn't happen to be a thread group leader.
3141 * As we don't care in the case of readdir.
3143 if (!iter
.task
|| !has_group_leader_pid(iter
.task
)) {
3147 get_task_struct(iter
.task
);
3153 #define TGID_OFFSET (FIRST_PROCESS_ENTRY + 2)
3155 /* for the /proc/ directory itself, after non-process stuff has been done */
3156 int proc_pid_readdir(struct file
*file
, struct dir_context
*ctx
)
3158 struct tgid_iter iter
;
3159 struct pid_namespace
*ns
= file_inode(file
)->i_sb
->s_fs_info
;
3160 loff_t pos
= ctx
->pos
;
3162 if (pos
>= PID_MAX_LIMIT
+ TGID_OFFSET
)
3165 if (pos
== TGID_OFFSET
- 2) {
3166 struct inode
*inode
= d_inode(ns
->proc_self
);
3167 if (!dir_emit(ctx
, "self", 4, inode
->i_ino
, DT_LNK
))
3169 ctx
->pos
= pos
= pos
+ 1;
3171 if (pos
== TGID_OFFSET
- 1) {
3172 struct inode
*inode
= d_inode(ns
->proc_thread_self
);
3173 if (!dir_emit(ctx
, "thread-self", 11, inode
->i_ino
, DT_LNK
))
3175 ctx
->pos
= pos
= pos
+ 1;
3177 iter
.tgid
= pos
- TGID_OFFSET
;
3179 for (iter
= next_tgid(ns
, iter
);
3181 iter
.tgid
+= 1, iter
= next_tgid(ns
, iter
)) {
3182 char name
[PROC_NUMBUF
];
3186 if (!has_pid_permissions(ns
, iter
.task
, HIDEPID_INVISIBLE
))
3189 len
= snprintf(name
, sizeof(name
), "%d", iter
.tgid
);
3190 ctx
->pos
= iter
.tgid
+ TGID_OFFSET
;
3191 if (!proc_fill_cache(file
, ctx
, name
, len
,
3192 proc_pid_instantiate
, iter
.task
, NULL
)) {
3193 put_task_struct(iter
.task
);
3197 ctx
->pos
= PID_MAX_LIMIT
+ TGID_OFFSET
;
3202 * proc_tid_comm_permission is a special permission function exclusively
3203 * used for the node /proc/<pid>/task/<tid>/comm.
3204 * It bypasses generic permission checks in the case where a task of the same
3205 * task group attempts to access the node.
3206 * The rationale behind this is that glibc and bionic access this node for
3207 * cross thread naming (pthread_set/getname_np(!self)). However, if
3208 * PR_SET_DUMPABLE gets set to 0 this node among others becomes uid=0 gid=0,
3209 * which locks out the cross thread naming implementation.
3210 * This function makes sure that the node is always accessible for members of
3211 * same thread group.
3213 static int proc_tid_comm_permission(struct inode
*inode
, int mask
)
3215 bool is_same_tgroup
;
3216 struct task_struct
*task
;
3218 task
= get_proc_task(inode
);
3221 is_same_tgroup
= same_thread_group(current
, task
);
3222 put_task_struct(task
);
3224 if (likely(is_same_tgroup
&& !(mask
& MAY_EXEC
))) {
3225 /* This file (/proc/<pid>/task/<tid>/comm) can always be
3226 * read or written by the members of the corresponding
3232 return generic_permission(inode
, mask
);
3235 static const struct inode_operations proc_tid_comm_inode_operations
= {
3236 .permission
= proc_tid_comm_permission
,
3242 static const struct pid_entry tid_base_stuff
[] = {
3243 DIR("fd", S_IRUSR
|S_IXUSR
, proc_fd_inode_operations
, proc_fd_operations
),
3244 DIR("fdinfo", S_IRUSR
|S_IXUSR
, proc_fdinfo_inode_operations
, proc_fdinfo_operations
),
3245 DIR("ns", S_IRUSR
|S_IXUGO
, proc_ns_dir_inode_operations
, proc_ns_dir_operations
),
3247 DIR("net", S_IRUGO
|S_IXUGO
, proc_net_inode_operations
, proc_net_operations
),
3249 REG("environ", S_IRUSR
, proc_environ_operations
),
3250 REG("auxv", S_IRUSR
, proc_auxv_operations
),
3251 ONE("status", S_IRUGO
, proc_pid_status
),
3252 ONE("personality", S_IRUSR
, proc_pid_personality
),
3253 ONE("limits", S_IRUGO
, proc_pid_limits
),
3254 #ifdef CONFIG_SCHED_DEBUG
3255 REG("sched", S_IRUGO
|S_IWUSR
, proc_pid_sched_operations
),
3257 NOD("comm", S_IFREG
|S_IRUGO
|S_IWUSR
,
3258 &proc_tid_comm_inode_operations
,
3259 &proc_pid_set_comm_operations
, {}),
3260 #ifdef CONFIG_HAVE_ARCH_TRACEHOOK
3261 ONE("syscall", S_IRUSR
, proc_pid_syscall
),
3263 REG("cmdline", S_IRUGO
, proc_pid_cmdline_ops
),
3264 ONE("stat", S_IRUGO
, proc_tid_stat
),
3265 ONE("statm", S_IRUGO
, proc_pid_statm
),
3266 REG("maps", S_IRUGO
, proc_tid_maps_operations
),
3267 #ifdef CONFIG_PROC_CHILDREN
3268 REG("children", S_IRUGO
, proc_tid_children_operations
),
3271 REG("numa_maps", S_IRUGO
, proc_tid_numa_maps_operations
),
3273 REG("mem", S_IRUSR
|S_IWUSR
, proc_mem_operations
),
3274 LNK("cwd", proc_cwd_link
),
3275 LNK("root", proc_root_link
),
3276 LNK("exe", proc_exe_link
),
3277 REG("mounts", S_IRUGO
, proc_mounts_operations
),
3278 REG("mountinfo", S_IRUGO
, proc_mountinfo_operations
),
3279 #ifdef CONFIG_PROC_PAGE_MONITOR
3280 REG("clear_refs", S_IWUSR
, proc_clear_refs_operations
),
3281 REG("smaps", S_IRUGO
, proc_tid_smaps_operations
),
3282 REG("pagemap", S_IRUSR
, proc_pagemap_operations
),
3284 #ifdef CONFIG_SECURITY
3285 DIR("attr", S_IRUGO
|S_IXUGO
, proc_attr_dir_inode_operations
, proc_attr_dir_operations
),
3287 #ifdef CONFIG_KALLSYMS
3288 ONE("wchan", S_IRUGO
, proc_pid_wchan
),
3290 #ifdef CONFIG_STACKTRACE
3291 ONE("stack", S_IRUSR
, proc_pid_stack
),
3293 #ifdef CONFIG_SCHED_INFO
3294 ONE("schedstat", S_IRUGO
, proc_pid_schedstat
),
3296 #ifdef CONFIG_LATENCYTOP
3297 REG("latency", S_IRUGO
, proc_lstats_operations
),
3299 #ifdef CONFIG_PROC_PID_CPUSET
3300 ONE("cpuset", S_IRUGO
, proc_cpuset_show
),
3302 #ifdef CONFIG_CGROUPS
3303 ONE("cgroup", S_IRUGO
, proc_cgroup_show
),
3305 ONE("oom_score", S_IRUGO
, proc_oom_score
),
3306 REG("oom_adj", S_IRUGO
|S_IWUSR
, proc_oom_adj_operations
),
3307 REG("oom_score_adj", S_IRUGO
|S_IWUSR
, proc_oom_score_adj_operations
),
3308 #ifdef CONFIG_AUDITSYSCALL
3309 REG("loginuid", S_IWUSR
|S_IRUGO
, proc_loginuid_operations
),
3310 REG("sessionid", S_IRUGO
, proc_sessionid_operations
),
3312 #ifdef CONFIG_FAULT_INJECTION
3313 REG("make-it-fail", S_IRUGO
|S_IWUSR
, proc_fault_inject_operations
),
3315 #ifdef CONFIG_TASK_IO_ACCOUNTING
3316 ONE("io", S_IRUSR
, proc_tid_io_accounting
),
3318 #ifdef CONFIG_HARDWALL
3319 ONE("hardwall", S_IRUGO
, proc_pid_hardwall
),
3321 #ifdef CONFIG_USER_NS
3322 REG("uid_map", S_IRUGO
|S_IWUSR
, proc_uid_map_operations
),
3323 REG("gid_map", S_IRUGO
|S_IWUSR
, proc_gid_map_operations
),
3324 REG("projid_map", S_IRUGO
|S_IWUSR
, proc_projid_map_operations
),
3325 REG("setgroups", S_IRUGO
|S_IWUSR
, proc_setgroups_operations
),
3327 #ifdef CONFIG_LIVEPATCH
3328 ONE("patch_state", S_IRUSR
, proc_pid_patch_state
),
3332 static int proc_tid_base_readdir(struct file
*file
, struct dir_context
*ctx
)
3334 return proc_pident_readdir(file
, ctx
,
3335 tid_base_stuff
, ARRAY_SIZE(tid_base_stuff
));
3338 static struct dentry
*proc_tid_base_lookup(struct inode
*dir
, struct dentry
*dentry
, unsigned int flags
)
3340 return proc_pident_lookup(dir
, dentry
,
3341 tid_base_stuff
, ARRAY_SIZE(tid_base_stuff
));
3344 static const struct file_operations proc_tid_base_operations
= {
3345 .read
= generic_read_dir
,
3346 .iterate_shared
= proc_tid_base_readdir
,
3347 .llseek
= generic_file_llseek
,
3350 static const struct inode_operations proc_tid_base_inode_operations
= {
3351 .lookup
= proc_tid_base_lookup
,
3352 .getattr
= pid_getattr
,
3353 .setattr
= proc_setattr
,
3356 static int proc_task_instantiate(struct inode
*dir
,
3357 struct dentry
*dentry
, struct task_struct
*task
, const void *ptr
)
3359 struct inode
*inode
;
3360 inode
= proc_pid_make_inode(dir
->i_sb
, task
, S_IFDIR
| S_IRUGO
| S_IXUGO
);
3364 inode
->i_op
= &proc_tid_base_inode_operations
;
3365 inode
->i_fop
= &proc_tid_base_operations
;
3366 inode
->i_flags
|=S_IMMUTABLE
;
3368 set_nlink(inode
, nlink_tid
);
3370 d_set_d_op(dentry
, &pid_dentry_operations
);
3372 d_add(dentry
, inode
);
3373 /* Close the race of the process dying before we return the dentry */
3374 if (pid_revalidate(dentry
, 0))
3380 static struct dentry
*proc_task_lookup(struct inode
*dir
, struct dentry
* dentry
, unsigned int flags
)
3382 int result
= -ENOENT
;
3383 struct task_struct
*task
;
3384 struct task_struct
*leader
= get_proc_task(dir
);
3386 struct pid_namespace
*ns
;
3391 tid
= name_to_int(&dentry
->d_name
);
3395 ns
= dentry
->d_sb
->s_fs_info
;
3397 task
= find_task_by_pid_ns(tid
, ns
);
3399 get_task_struct(task
);
3403 if (!same_thread_group(leader
, task
))
3406 result
= proc_task_instantiate(dir
, dentry
, task
, NULL
);
3408 put_task_struct(task
);
3410 put_task_struct(leader
);
3412 return ERR_PTR(result
);
3416 * Find the first tid of a thread group to return to user space.
3418 * Usually this is just the thread group leader, but if the users
3419 * buffer was too small or there was a seek into the middle of the
3420 * directory we have more work todo.
3422 * In the case of a short read we start with find_task_by_pid.
3424 * In the case of a seek we start with the leader and walk nr
3427 static struct task_struct
*first_tid(struct pid
*pid
, int tid
, loff_t f_pos
,
3428 struct pid_namespace
*ns
)
3430 struct task_struct
*pos
, *task
;
3431 unsigned long nr
= f_pos
;
3433 if (nr
!= f_pos
) /* 32bit overflow? */
3437 task
= pid_task(pid
, PIDTYPE_PID
);
3441 /* Attempt to start with the tid of a thread */
3443 pos
= find_task_by_pid_ns(tid
, ns
);
3444 if (pos
&& same_thread_group(pos
, task
))
3448 /* If nr exceeds the number of threads there is nothing todo */
3449 if (nr
>= get_nr_threads(task
))
3452 /* If we haven't found our starting place yet start
3453 * with the leader and walk nr threads forward.
3455 pos
= task
= task
->group_leader
;
3459 } while_each_thread(task
, pos
);
3464 get_task_struct(pos
);
3471 * Find the next thread in the thread list.
3472 * Return NULL if there is an error or no next thread.
3474 * The reference to the input task_struct is released.
3476 static struct task_struct
*next_tid(struct task_struct
*start
)
3478 struct task_struct
*pos
= NULL
;
3480 if (pid_alive(start
)) {
3481 pos
= next_thread(start
);
3482 if (thread_group_leader(pos
))
3485 get_task_struct(pos
);
3488 put_task_struct(start
);
3492 /* for the /proc/TGID/task/ directories */
3493 static int proc_task_readdir(struct file
*file
, struct dir_context
*ctx
)
3495 struct inode
*inode
= file_inode(file
);
3496 struct task_struct
*task
;
3497 struct pid_namespace
*ns
;
3500 if (proc_inode_is_dead(inode
))
3503 if (!dir_emit_dots(file
, ctx
))
3506 /* f_version caches the tgid value that the last readdir call couldn't
3507 * return. lseek aka telldir automagically resets f_version to 0.
3509 ns
= inode
->i_sb
->s_fs_info
;
3510 tid
= (int)file
->f_version
;
3511 file
->f_version
= 0;
3512 for (task
= first_tid(proc_pid(inode
), tid
, ctx
->pos
- 2, ns
);
3514 task
= next_tid(task
), ctx
->pos
++) {
3515 char name
[PROC_NUMBUF
];
3517 tid
= task_pid_nr_ns(task
, ns
);
3518 len
= snprintf(name
, sizeof(name
), "%d", tid
);
3519 if (!proc_fill_cache(file
, ctx
, name
, len
,
3520 proc_task_instantiate
, task
, NULL
)) {
3521 /* returning this tgid failed, save it as the first
3522 * pid for the next readir call */
3523 file
->f_version
= (u64
)tid
;
3524 put_task_struct(task
);
3532 static int proc_task_getattr(const struct path
*path
, struct kstat
*stat
,
3533 u32 request_mask
, unsigned int query_flags
)
3535 struct inode
*inode
= d_inode(path
->dentry
);
3536 struct task_struct
*p
= get_proc_task(inode
);
3537 generic_fillattr(inode
, stat
);
3540 stat
->nlink
+= get_nr_threads(p
);
3547 static const struct inode_operations proc_task_inode_operations
= {
3548 .lookup
= proc_task_lookup
,
3549 .getattr
= proc_task_getattr
,
3550 .setattr
= proc_setattr
,
3551 .permission
= proc_pid_permission
,
3554 static const struct file_operations proc_task_operations
= {
3555 .read
= generic_read_dir
,
3556 .iterate_shared
= proc_task_readdir
,
3557 .llseek
= generic_file_llseek
,
3560 void __init
set_proc_pid_nlink(void)
3562 nlink_tid
= pid_entry_nlink(tid_base_stuff
, ARRAY_SIZE(tid_base_stuff
));
3563 nlink_tgid
= pid_entry_nlink(tgid_base_stuff
, ARRAY_SIZE(tgid_base_stuff
));