4 * Copyright (C) 1991, 1992 Linus Torvalds
6 * proc base directory handling functions
8 * 1999, Al Viro. Rewritten. Now it covers the whole per-process part.
9 * Instead of using magical inumbers to determine the kind of object
10 * we allocate and fill in-core inodes upon lookup. They don't even
11 * go into icache. We cache the reference to task_struct upon lookup too.
12 * Eventually it should become a filesystem in its own. We don't use the
13 * rest of procfs anymore.
19 * Bruna Moreira <bruna.moreira@indt.org.br>
20 * Edjard Mota <edjard.mota@indt.org.br>
21 * Ilias Biris <ilias.biris@indt.org.br>
22 * Mauricio Lin <mauricio.lin@indt.org.br>
24 * Embedded Linux Lab - 10LE Instituto Nokia de Tecnologia - INdT
26 * A new process specific entry (smaps) included in /proc. It shows the
27 * size of rss for each memory area. The maps entry lacks information
28 * about physical memory size (rss) for each mapped file, i.e.,
29 * rss information for executables and library files.
30 * This additional information is useful for any tools that need to know
31 * about physical memory consumption for a process specific library.
35 * Embedded Linux Lab - 10LE Instituto Nokia de Tecnologia - INdT
36 * Pud inclusion in the page table walking.
40 * 10LE Instituto Nokia de Tecnologia - INdT:
41 * A better way to walks through the page table as suggested by Hugh Dickins.
43 * Simo Piiroinen <simo.piiroinen@nokia.com>:
44 * Smaps information related to shared, private, clean and dirty pages.
46 * Paul Mundt <paul.mundt@nokia.com>:
47 * Overall revision about smaps.
50 #include <asm/uaccess.h>
52 #include <linux/errno.h>
53 #include <linux/time.h>
54 #include <linux/proc_fs.h>
55 #include <linux/stat.h>
56 #include <linux/task_io_accounting_ops.h>
57 #include <linux/init.h>
58 #include <linux/capability.h>
59 #include <linux/file.h>
60 #include <linux/fdtable.h>
61 #include <linux/string.h>
62 #include <linux/seq_file.h>
63 #include <linux/namei.h>
64 #include <linux/mnt_namespace.h>
66 #include <linux/swap.h>
67 #include <linux/rcupdate.h>
68 #include <linux/kallsyms.h>
69 #include <linux/stacktrace.h>
70 #include <linux/resource.h>
71 #include <linux/module.h>
72 #include <linux/mount.h>
73 #include <linux/security.h>
74 #include <linux/ptrace.h>
75 #include <linux/tracehook.h>
76 #include <linux/printk.h>
77 #include <linux/cgroup.h>
78 #include <linux/cpuset.h>
79 #include <linux/audit.h>
80 #include <linux/poll.h>
81 #include <linux/nsproxy.h>
82 #include <linux/oom.h>
83 #include <linux/elf.h>
84 #include <linux/pid_namespace.h>
85 #include <linux/user_namespace.h>
86 #include <linux/fs_struct.h>
87 #include <linux/slab.h>
88 #include <linux/flex_array.h>
89 #include <linux/posix-timers.h>
90 #ifdef CONFIG_HARDWALL
91 #include <asm/hardwall.h>
93 #include <trace/events/oom.h>
98 * Implementing inode permission operations in /proc is almost
99 * certainly an error. Permission checks need to happen during
100 * each system call not at open time. The reason is that most of
101 * what we wish to check for permissions in /proc varies at runtime.
103 * The classic example of a problem is opening file descriptors
104 * in /proc for a task before it execs a suid executable.
111 const struct inode_operations
*iop
;
112 const struct file_operations
*fop
;
116 #define NOD(NAME, MODE, IOP, FOP, OP) { \
118 .len = sizeof(NAME) - 1, \
125 #define DIR(NAME, MODE, iops, fops) \
126 NOD(NAME, (S_IFDIR|(MODE)), &iops, &fops, {} )
127 #define LNK(NAME, get_link) \
128 NOD(NAME, (S_IFLNK|S_IRWXUGO), \
129 &proc_pid_link_inode_operations, NULL, \
130 { .proc_get_link = get_link } )
131 #define REG(NAME, MODE, fops) \
132 NOD(NAME, (S_IFREG|(MODE)), NULL, &fops, {})
133 #define ONE(NAME, MODE, show) \
134 NOD(NAME, (S_IFREG|(MODE)), \
135 NULL, &proc_single_file_operations, \
136 { .proc_show = show } )
139 * Count the number of hardlinks for the pid_entry table, excluding the .
142 static unsigned int pid_entry_count_dirs(const struct pid_entry
*entries
,
149 for (i
= 0; i
< n
; ++i
) {
150 if (S_ISDIR(entries
[i
].mode
))
157 static int get_task_root(struct task_struct
*task
, struct path
*root
)
159 int result
= -ENOENT
;
163 get_fs_root(task
->fs
, root
);
170 static int proc_cwd_link(struct dentry
*dentry
, struct path
*path
)
172 struct task_struct
*task
= get_proc_task(d_inode(dentry
));
173 int result
= -ENOENT
;
178 get_fs_pwd(task
->fs
, path
);
182 put_task_struct(task
);
187 static int proc_root_link(struct dentry
*dentry
, struct path
*path
)
189 struct task_struct
*task
= get_proc_task(d_inode(dentry
));
190 int result
= -ENOENT
;
193 result
= get_task_root(task
, path
);
194 put_task_struct(task
);
199 static ssize_t
proc_pid_cmdline_read(struct file
*file
, char __user
*buf
,
200 size_t _count
, loff_t
*pos
)
202 struct task_struct
*tsk
;
203 struct mm_struct
*mm
;
205 unsigned long count
= _count
;
206 unsigned long arg_start
, arg_end
, env_start
, env_end
;
207 unsigned long len1
, len2
, len
;
214 tsk
= get_proc_task(file_inode(file
));
217 mm
= get_task_mm(tsk
);
218 put_task_struct(tsk
);
221 /* Check if process spawned far enough to have cmdline. */
227 page
= (char *)__get_free_page(GFP_TEMPORARY
);
233 down_read(&mm
->mmap_sem
);
234 arg_start
= mm
->arg_start
;
235 arg_end
= mm
->arg_end
;
236 env_start
= mm
->env_start
;
237 env_end
= mm
->env_end
;
238 up_read(&mm
->mmap_sem
);
240 BUG_ON(arg_start
> arg_end
);
241 BUG_ON(env_start
> env_end
);
243 len1
= arg_end
- arg_start
;
244 len2
= env_end
- env_start
;
252 * Inherently racy -- command line shares address space
253 * with code and data.
255 rv
= access_remote_vm(mm
, arg_end
- 1, &c
, 1, 0);
262 /* Command line (set of strings) occupies whole ARGV. */
266 p
= arg_start
+ *pos
;
268 while (count
> 0 && len
> 0) {
272 _count
= min3(count
, len
, PAGE_SIZE
);
273 nr_read
= access_remote_vm(mm
, p
, page
, _count
, 0);
279 if (copy_to_user(buf
, page
, nr_read
)) {
292 * Command line (1 string) occupies ARGV and maybe
295 if (len1
+ len2
<= *pos
)
300 p
= arg_start
+ *pos
;
302 while (count
> 0 && len
> 0) {
303 unsigned int _count
, l
;
307 _count
= min3(count
, len
, PAGE_SIZE
);
308 nr_read
= access_remote_vm(mm
, p
, page
, _count
, 0);
315 * Command line can be shorter than whole ARGV
316 * even if last "marker" byte says it is not.
319 l
= strnlen(page
, nr_read
);
325 if (copy_to_user(buf
, page
, nr_read
)) {
341 * Command line (1 string) occupies ARGV and
345 p
= env_start
+ *pos
- len1
;
346 len
= len1
+ len2
- *pos
;
351 while (count
> 0 && len
> 0) {
352 unsigned int _count
, l
;
356 _count
= min3(count
, len
, PAGE_SIZE
);
357 nr_read
= access_remote_vm(mm
, p
, page
, _count
, 0);
365 l
= strnlen(page
, nr_read
);
371 if (copy_to_user(buf
, page
, nr_read
)) {
390 free_page((unsigned long)page
);
398 static const struct file_operations proc_pid_cmdline_ops
= {
399 .read
= proc_pid_cmdline_read
,
400 .llseek
= generic_file_llseek
,
403 static int proc_pid_auxv(struct seq_file
*m
, struct pid_namespace
*ns
,
404 struct pid
*pid
, struct task_struct
*task
)
406 struct mm_struct
*mm
= mm_access(task
, PTRACE_MODE_READ_FSCREDS
);
407 if (mm
&& !IS_ERR(mm
)) {
408 unsigned int nwords
= 0;
411 } while (mm
->saved_auxv
[nwords
- 2] != 0); /* AT_NULL */
412 seq_write(m
, mm
->saved_auxv
, nwords
* sizeof(mm
->saved_auxv
[0]));
420 #ifdef CONFIG_KALLSYMS
422 * Provides a wchan file via kallsyms in a proper one-value-per-file format.
423 * Returns the resolved symbol. If that fails, simply return the address.
425 static int proc_pid_wchan(struct seq_file
*m
, struct pid_namespace
*ns
,
426 struct pid
*pid
, struct task_struct
*task
)
429 char symname
[KSYM_NAME_LEN
];
431 wchan
= get_wchan(task
);
433 if (wchan
&& ptrace_may_access(task
, PTRACE_MODE_READ_FSCREDS
)
434 && !lookup_symbol_name(wchan
, symname
))
435 seq_printf(m
, "%s", symname
);
441 #endif /* CONFIG_KALLSYMS */
443 static int lock_trace(struct task_struct
*task
)
445 int err
= mutex_lock_killable(&task
->signal
->cred_guard_mutex
);
448 if (!ptrace_may_access(task
, PTRACE_MODE_ATTACH_FSCREDS
)) {
449 mutex_unlock(&task
->signal
->cred_guard_mutex
);
455 static void unlock_trace(struct task_struct
*task
)
457 mutex_unlock(&task
->signal
->cred_guard_mutex
);
460 #ifdef CONFIG_STACKTRACE
462 #define MAX_STACK_TRACE_DEPTH 64
464 static int proc_pid_stack(struct seq_file
*m
, struct pid_namespace
*ns
,
465 struct pid
*pid
, struct task_struct
*task
)
467 struct stack_trace trace
;
468 unsigned long *entries
;
472 entries
= kmalloc(MAX_STACK_TRACE_DEPTH
* sizeof(*entries
), GFP_KERNEL
);
476 trace
.nr_entries
= 0;
477 trace
.max_entries
= MAX_STACK_TRACE_DEPTH
;
478 trace
.entries
= entries
;
481 err
= lock_trace(task
);
483 save_stack_trace_tsk(task
, &trace
);
485 for (i
= 0; i
< trace
.nr_entries
; i
++) {
486 seq_printf(m
, "[<%pK>] %pS\n",
487 (void *)entries
[i
], (void *)entries
[i
]);
497 #ifdef CONFIG_SCHED_INFO
499 * Provides /proc/PID/schedstat
501 static int proc_pid_schedstat(struct seq_file
*m
, struct pid_namespace
*ns
,
502 struct pid
*pid
, struct task_struct
*task
)
504 if (unlikely(!sched_info_on()))
505 seq_printf(m
, "0 0 0\n");
507 seq_printf(m
, "%llu %llu %lu\n",
508 (unsigned long long)task
->se
.sum_exec_runtime
,
509 (unsigned long long)task
->sched_info
.run_delay
,
510 task
->sched_info
.pcount
);
516 #ifdef CONFIG_LATENCYTOP
517 static int lstats_show_proc(struct seq_file
*m
, void *v
)
520 struct inode
*inode
= m
->private;
521 struct task_struct
*task
= get_proc_task(inode
);
525 seq_puts(m
, "Latency Top version : v0.1\n");
526 for (i
= 0; i
< 32; i
++) {
527 struct latency_record
*lr
= &task
->latency_record
[i
];
528 if (lr
->backtrace
[0]) {
530 seq_printf(m
, "%i %li %li",
531 lr
->count
, lr
->time
, lr
->max
);
532 for (q
= 0; q
< LT_BACKTRACEDEPTH
; q
++) {
533 unsigned long bt
= lr
->backtrace
[q
];
538 seq_printf(m
, " %ps", (void *)bt
);
544 put_task_struct(task
);
548 static int lstats_open(struct inode
*inode
, struct file
*file
)
550 return single_open(file
, lstats_show_proc
, inode
);
553 static ssize_t
lstats_write(struct file
*file
, const char __user
*buf
,
554 size_t count
, loff_t
*offs
)
556 struct task_struct
*task
= get_proc_task(file_inode(file
));
560 clear_all_latency_tracing(task
);
561 put_task_struct(task
);
566 static const struct file_operations proc_lstats_operations
= {
569 .write
= lstats_write
,
571 .release
= single_release
,
576 static int proc_oom_score(struct seq_file
*m
, struct pid_namespace
*ns
,
577 struct pid
*pid
, struct task_struct
*task
)
579 unsigned long totalpages
= totalram_pages
+ total_swap_pages
;
580 unsigned long points
= 0;
582 read_lock(&tasklist_lock
);
584 points
= oom_badness(task
, NULL
, NULL
, totalpages
) *
586 read_unlock(&tasklist_lock
);
587 seq_printf(m
, "%lu\n", points
);
597 static const struct limit_names lnames
[RLIM_NLIMITS
] = {
598 [RLIMIT_CPU
] = {"Max cpu time", "seconds"},
599 [RLIMIT_FSIZE
] = {"Max file size", "bytes"},
600 [RLIMIT_DATA
] = {"Max data size", "bytes"},
601 [RLIMIT_STACK
] = {"Max stack size", "bytes"},
602 [RLIMIT_CORE
] = {"Max core file size", "bytes"},
603 [RLIMIT_RSS
] = {"Max resident set", "bytes"},
604 [RLIMIT_NPROC
] = {"Max processes", "processes"},
605 [RLIMIT_NOFILE
] = {"Max open files", "files"},
606 [RLIMIT_MEMLOCK
] = {"Max locked memory", "bytes"},
607 [RLIMIT_AS
] = {"Max address space", "bytes"},
608 [RLIMIT_LOCKS
] = {"Max file locks", "locks"},
609 [RLIMIT_SIGPENDING
] = {"Max pending signals", "signals"},
610 [RLIMIT_MSGQUEUE
] = {"Max msgqueue size", "bytes"},
611 [RLIMIT_NICE
] = {"Max nice priority", NULL
},
612 [RLIMIT_RTPRIO
] = {"Max realtime priority", NULL
},
613 [RLIMIT_RTTIME
] = {"Max realtime timeout", "us"},
616 /* Display limits for a process */
617 static int proc_pid_limits(struct seq_file
*m
, struct pid_namespace
*ns
,
618 struct pid
*pid
, struct task_struct
*task
)
623 struct rlimit rlim
[RLIM_NLIMITS
];
625 if (!lock_task_sighand(task
, &flags
))
627 memcpy(rlim
, task
->signal
->rlim
, sizeof(struct rlimit
) * RLIM_NLIMITS
);
628 unlock_task_sighand(task
, &flags
);
631 * print the file header
633 seq_printf(m
, "%-25s %-20s %-20s %-10s\n",
634 "Limit", "Soft Limit", "Hard Limit", "Units");
636 for (i
= 0; i
< RLIM_NLIMITS
; i
++) {
637 if (rlim
[i
].rlim_cur
== RLIM_INFINITY
)
638 seq_printf(m
, "%-25s %-20s ",
639 lnames
[i
].name
, "unlimited");
641 seq_printf(m
, "%-25s %-20lu ",
642 lnames
[i
].name
, rlim
[i
].rlim_cur
);
644 if (rlim
[i
].rlim_max
== RLIM_INFINITY
)
645 seq_printf(m
, "%-20s ", "unlimited");
647 seq_printf(m
, "%-20lu ", rlim
[i
].rlim_max
);
650 seq_printf(m
, "%-10s\n", lnames
[i
].unit
);
658 #ifdef CONFIG_HAVE_ARCH_TRACEHOOK
659 static int proc_pid_syscall(struct seq_file
*m
, struct pid_namespace
*ns
,
660 struct pid
*pid
, struct task_struct
*task
)
663 unsigned long args
[6], sp
, pc
;
666 res
= lock_trace(task
);
670 if (task_current_syscall(task
, &nr
, args
, 6, &sp
, &pc
))
671 seq_puts(m
, "running\n");
673 seq_printf(m
, "%ld 0x%lx 0x%lx\n", nr
, sp
, pc
);
676 "%ld 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx\n",
678 args
[0], args
[1], args
[2], args
[3], args
[4], args
[5],
684 #endif /* CONFIG_HAVE_ARCH_TRACEHOOK */
686 /************************************************************************/
687 /* Here the fs part begins */
688 /************************************************************************/
690 /* permission checks */
691 static int proc_fd_access_allowed(struct inode
*inode
)
693 struct task_struct
*task
;
695 /* Allow access to a task's file descriptors if it is us or we
696 * may use ptrace attach to the process and find out that
699 task
= get_proc_task(inode
);
701 allowed
= ptrace_may_access(task
, PTRACE_MODE_READ_FSCREDS
);
702 put_task_struct(task
);
707 int proc_setattr(struct dentry
*dentry
, struct iattr
*attr
)
710 struct inode
*inode
= d_inode(dentry
);
712 if (attr
->ia_valid
& ATTR_MODE
)
715 error
= inode_change_ok(inode
, attr
);
719 setattr_copy(inode
, attr
);
720 mark_inode_dirty(inode
);
725 * May current process learn task's sched/cmdline info (for hide_pid_min=1)
726 * or euid/egid (for hide_pid_min=2)?
728 static bool has_pid_permissions(struct pid_namespace
*pid
,
729 struct task_struct
*task
,
732 if (pid
->hide_pid
< hide_pid_min
)
734 if (in_group_p(pid
->pid_gid
))
736 return ptrace_may_access(task
, PTRACE_MODE_READ_FSCREDS
);
740 static int proc_pid_permission(struct inode
*inode
, int mask
)
742 struct pid_namespace
*pid
= inode
->i_sb
->s_fs_info
;
743 struct task_struct
*task
;
746 task
= get_proc_task(inode
);
749 has_perms
= has_pid_permissions(pid
, task
, 1);
750 put_task_struct(task
);
753 if (pid
->hide_pid
== 2) {
755 * Let's make getdents(), stat(), and open()
756 * consistent with each other. If a process
757 * may not stat() a file, it shouldn't be seen
765 return generic_permission(inode
, mask
);
770 static const struct inode_operations proc_def_inode_operations
= {
771 .setattr
= proc_setattr
,
774 static int proc_single_show(struct seq_file
*m
, void *v
)
776 struct inode
*inode
= m
->private;
777 struct pid_namespace
*ns
;
779 struct task_struct
*task
;
782 ns
= inode
->i_sb
->s_fs_info
;
783 pid
= proc_pid(inode
);
784 task
= get_pid_task(pid
, PIDTYPE_PID
);
788 ret
= PROC_I(inode
)->op
.proc_show(m
, ns
, pid
, task
);
790 put_task_struct(task
);
794 static int proc_single_open(struct inode
*inode
, struct file
*filp
)
796 return single_open(filp
, proc_single_show
, inode
);
799 static const struct file_operations proc_single_file_operations
= {
800 .open
= proc_single_open
,
803 .release
= single_release
,
807 struct mm_struct
*proc_mem_open(struct inode
*inode
, unsigned int mode
)
809 struct task_struct
*task
= get_proc_task(inode
);
810 struct mm_struct
*mm
= ERR_PTR(-ESRCH
);
813 mm
= mm_access(task
, mode
| PTRACE_MODE_FSCREDS
);
814 put_task_struct(task
);
816 if (!IS_ERR_OR_NULL(mm
)) {
817 /* ensure this mm_struct can't be freed */
818 atomic_inc(&mm
->mm_count
);
819 /* but do not pin its memory */
827 static int __mem_open(struct inode
*inode
, struct file
*file
, unsigned int mode
)
829 struct mm_struct
*mm
= proc_mem_open(inode
, mode
);
834 file
->private_data
= mm
;
838 static int mem_open(struct inode
*inode
, struct file
*file
)
840 int ret
= __mem_open(inode
, file
, PTRACE_MODE_ATTACH
);
842 /* OK to pass negative loff_t, we can catch out-of-range */
843 file
->f_mode
|= FMODE_UNSIGNED_OFFSET
;
848 static ssize_t
mem_rw(struct file
*file
, char __user
*buf
,
849 size_t count
, loff_t
*ppos
, int write
)
851 struct mm_struct
*mm
= file
->private_data
;
852 unsigned long addr
= *ppos
;
859 page
= (char *)__get_free_page(GFP_TEMPORARY
);
864 if (!atomic_inc_not_zero(&mm
->mm_users
))
868 int this_len
= min_t(int, count
, PAGE_SIZE
);
870 if (write
&& copy_from_user(page
, buf
, this_len
)) {
875 this_len
= access_remote_vm(mm
, addr
, page
, this_len
, write
);
882 if (!write
&& copy_to_user(buf
, page
, this_len
)) {
896 free_page((unsigned long) page
);
900 static ssize_t
mem_read(struct file
*file
, char __user
*buf
,
901 size_t count
, loff_t
*ppos
)
903 return mem_rw(file
, buf
, count
, ppos
, 0);
906 static ssize_t
mem_write(struct file
*file
, const char __user
*buf
,
907 size_t count
, loff_t
*ppos
)
909 return mem_rw(file
, (char __user
*)buf
, count
, ppos
, 1);
912 loff_t
mem_lseek(struct file
*file
, loff_t offset
, int orig
)
916 file
->f_pos
= offset
;
919 file
->f_pos
+= offset
;
924 force_successful_syscall_return();
928 static int mem_release(struct inode
*inode
, struct file
*file
)
930 struct mm_struct
*mm
= file
->private_data
;
936 static const struct file_operations proc_mem_operations
= {
941 .release
= mem_release
,
944 static int environ_open(struct inode
*inode
, struct file
*file
)
946 return __mem_open(inode
, file
, PTRACE_MODE_READ
);
949 static ssize_t
environ_read(struct file
*file
, char __user
*buf
,
950 size_t count
, loff_t
*ppos
)
953 unsigned long src
= *ppos
;
955 struct mm_struct
*mm
= file
->private_data
;
960 page
= (char *)__get_free_page(GFP_TEMPORARY
);
965 if (!atomic_inc_not_zero(&mm
->mm_users
))
968 size_t this_len
, max_len
;
971 if (src
>= (mm
->env_end
- mm
->env_start
))
974 this_len
= mm
->env_end
- (mm
->env_start
+ src
);
976 max_len
= min_t(size_t, PAGE_SIZE
, count
);
977 this_len
= min(max_len
, this_len
);
979 retval
= access_remote_vm(mm
, (mm
->env_start
+ src
),
987 if (copy_to_user(buf
, page
, retval
)) {
1001 free_page((unsigned long) page
);
1005 static const struct file_operations proc_environ_operations
= {
1006 .open
= environ_open
,
1007 .read
= environ_read
,
1008 .llseek
= generic_file_llseek
,
1009 .release
= mem_release
,
1012 static ssize_t
oom_adj_read(struct file
*file
, char __user
*buf
, size_t count
,
1015 struct task_struct
*task
= get_proc_task(file_inode(file
));
1016 char buffer
[PROC_NUMBUF
];
1017 int oom_adj
= OOM_ADJUST_MIN
;
1019 unsigned long flags
;
1023 if (lock_task_sighand(task
, &flags
)) {
1024 if (task
->signal
->oom_score_adj
== OOM_SCORE_ADJ_MAX
)
1025 oom_adj
= OOM_ADJUST_MAX
;
1027 oom_adj
= (task
->signal
->oom_score_adj
* -OOM_DISABLE
) /
1029 unlock_task_sighand(task
, &flags
);
1031 put_task_struct(task
);
1032 len
= snprintf(buffer
, sizeof(buffer
), "%d\n", oom_adj
);
1033 return simple_read_from_buffer(buf
, count
, ppos
, buffer
, len
);
1037 * /proc/pid/oom_adj exists solely for backwards compatibility with previous
1038 * kernels. The effective policy is defined by oom_score_adj, which has a
1039 * different scale: oom_adj grew exponentially and oom_score_adj grows linearly.
1040 * Values written to oom_adj are simply mapped linearly to oom_score_adj.
1041 * Processes that become oom disabled via oom_adj will still be oom disabled
1042 * with this implementation.
1044 * oom_adj cannot be removed since existing userspace binaries use it.
1046 static ssize_t
oom_adj_write(struct file
*file
, const char __user
*buf
,
1047 size_t count
, loff_t
*ppos
)
1049 struct task_struct
*task
;
1050 char buffer
[PROC_NUMBUF
];
1052 unsigned long flags
;
1055 memset(buffer
, 0, sizeof(buffer
));
1056 if (count
> sizeof(buffer
) - 1)
1057 count
= sizeof(buffer
) - 1;
1058 if (copy_from_user(buffer
, buf
, count
)) {
1063 err
= kstrtoint(strstrip(buffer
), 0, &oom_adj
);
1066 if ((oom_adj
< OOM_ADJUST_MIN
|| oom_adj
> OOM_ADJUST_MAX
) &&
1067 oom_adj
!= OOM_DISABLE
) {
1072 task
= get_proc_task(file_inode(file
));
1084 if (!lock_task_sighand(task
, &flags
)) {
1090 * Scale /proc/pid/oom_score_adj appropriately ensuring that a maximum
1091 * value is always attainable.
1093 if (oom_adj
== OOM_ADJUST_MAX
)
1094 oom_adj
= OOM_SCORE_ADJ_MAX
;
1096 oom_adj
= (oom_adj
* OOM_SCORE_ADJ_MAX
) / -OOM_DISABLE
;
1098 if (oom_adj
< task
->signal
->oom_score_adj
&&
1099 !capable(CAP_SYS_RESOURCE
)) {
1105 * /proc/pid/oom_adj is provided for legacy purposes, ask users to use
1106 * /proc/pid/oom_score_adj instead.
1108 pr_warn_once("%s (%d): /proc/%d/oom_adj is deprecated, please use /proc/%d/oom_score_adj instead.\n",
1109 current
->comm
, task_pid_nr(current
), task_pid_nr(task
),
1112 task
->signal
->oom_score_adj
= oom_adj
;
1113 trace_oom_score_adj_update(task
);
1115 unlock_task_sighand(task
, &flags
);
1118 put_task_struct(task
);
1120 return err
< 0 ? err
: count
;
1123 static const struct file_operations proc_oom_adj_operations
= {
1124 .read
= oom_adj_read
,
1125 .write
= oom_adj_write
,
1126 .llseek
= generic_file_llseek
,
1129 static ssize_t
oom_score_adj_read(struct file
*file
, char __user
*buf
,
1130 size_t count
, loff_t
*ppos
)
1132 struct task_struct
*task
= get_proc_task(file_inode(file
));
1133 char buffer
[PROC_NUMBUF
];
1134 short oom_score_adj
= OOM_SCORE_ADJ_MIN
;
1135 unsigned long flags
;
1140 if (lock_task_sighand(task
, &flags
)) {
1141 oom_score_adj
= task
->signal
->oom_score_adj
;
1142 unlock_task_sighand(task
, &flags
);
1144 put_task_struct(task
);
1145 len
= snprintf(buffer
, sizeof(buffer
), "%hd\n", oom_score_adj
);
1146 return simple_read_from_buffer(buf
, count
, ppos
, buffer
, len
);
1149 static ssize_t
oom_score_adj_write(struct file
*file
, const char __user
*buf
,
1150 size_t count
, loff_t
*ppos
)
1152 struct task_struct
*task
;
1153 char buffer
[PROC_NUMBUF
];
1154 unsigned long flags
;
1158 memset(buffer
, 0, sizeof(buffer
));
1159 if (count
> sizeof(buffer
) - 1)
1160 count
= sizeof(buffer
) - 1;
1161 if (copy_from_user(buffer
, buf
, count
)) {
1166 err
= kstrtoint(strstrip(buffer
), 0, &oom_score_adj
);
1169 if (oom_score_adj
< OOM_SCORE_ADJ_MIN
||
1170 oom_score_adj
> OOM_SCORE_ADJ_MAX
) {
1175 task
= get_proc_task(file_inode(file
));
1187 if (!lock_task_sighand(task
, &flags
)) {
1192 if ((short)oom_score_adj
< task
->signal
->oom_score_adj_min
&&
1193 !capable(CAP_SYS_RESOURCE
)) {
1198 task
->signal
->oom_score_adj
= (short)oom_score_adj
;
1199 if (has_capability_noaudit(current
, CAP_SYS_RESOURCE
))
1200 task
->signal
->oom_score_adj_min
= (short)oom_score_adj
;
1201 trace_oom_score_adj_update(task
);
1204 unlock_task_sighand(task
, &flags
);
1207 put_task_struct(task
);
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 21
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 mm_struct
*mm
;
1548 struct file
*exe_file
;
1550 task
= get_proc_task(d_inode(dentry
));
1553 mm
= get_task_mm(task
);
1554 put_task_struct(task
);
1557 exe_file
= get_mm_exe_file(mm
);
1560 *exe_path
= exe_file
->f_path
;
1561 path_get(&exe_file
->f_path
);
1568 static const char *proc_pid_get_link(struct dentry
*dentry
,
1569 struct inode
*inode
,
1570 struct delayed_call
*done
)
1573 int error
= -EACCES
;
1576 return ERR_PTR(-ECHILD
);
1578 /* Are we allowed to snoop on the tasks file descriptors? */
1579 if (!proc_fd_access_allowed(inode
))
1582 error
= PROC_I(inode
)->op
.proc_get_link(dentry
, &path
);
1586 nd_jump_link(&path
);
1589 return ERR_PTR(error
);
1592 static int do_proc_readlink(struct path
*path
, char __user
*buffer
, int buflen
)
1594 char *tmp
= (char*)__get_free_page(GFP_TEMPORARY
);
1601 pathname
= d_path(path
, tmp
, PAGE_SIZE
);
1602 len
= PTR_ERR(pathname
);
1603 if (IS_ERR(pathname
))
1605 len
= tmp
+ PAGE_SIZE
- 1 - pathname
;
1609 if (copy_to_user(buffer
, pathname
, len
))
1612 free_page((unsigned long)tmp
);
1616 static int proc_pid_readlink(struct dentry
* dentry
, char __user
* buffer
, int buflen
)
1618 int error
= -EACCES
;
1619 struct inode
*inode
= d_inode(dentry
);
1622 /* Are we allowed to snoop on the tasks file descriptors? */
1623 if (!proc_fd_access_allowed(inode
))
1626 error
= PROC_I(inode
)->op
.proc_get_link(dentry
, &path
);
1630 error
= do_proc_readlink(&path
, buffer
, buflen
);
1636 const struct inode_operations proc_pid_link_inode_operations
= {
1637 .readlink
= proc_pid_readlink
,
1638 .get_link
= proc_pid_get_link
,
1639 .setattr
= proc_setattr
,
1643 /* building an inode */
1645 struct inode
*proc_pid_make_inode(struct super_block
* sb
, struct task_struct
*task
)
1647 struct inode
* inode
;
1648 struct proc_inode
*ei
;
1649 const struct cred
*cred
;
1651 /* We need a new inode */
1653 inode
= new_inode(sb
);
1659 inode
->i_ino
= get_next_ino();
1660 inode
->i_mtime
= inode
->i_atime
= inode
->i_ctime
= CURRENT_TIME
;
1661 inode
->i_op
= &proc_def_inode_operations
;
1664 * grab the reference to task.
1666 ei
->pid
= get_task_pid(task
, PIDTYPE_PID
);
1670 if (task_dumpable(task
)) {
1672 cred
= __task_cred(task
);
1673 inode
->i_uid
= cred
->euid
;
1674 inode
->i_gid
= cred
->egid
;
1677 security_task_to_inode(task
, inode
);
1687 int pid_getattr(struct vfsmount
*mnt
, struct dentry
*dentry
, struct kstat
*stat
)
1689 struct inode
*inode
= d_inode(dentry
);
1690 struct task_struct
*task
;
1691 const struct cred
*cred
;
1692 struct pid_namespace
*pid
= dentry
->d_sb
->s_fs_info
;
1694 generic_fillattr(inode
, stat
);
1697 stat
->uid
= GLOBAL_ROOT_UID
;
1698 stat
->gid
= GLOBAL_ROOT_GID
;
1699 task
= pid_task(proc_pid(inode
), PIDTYPE_PID
);
1701 if (!has_pid_permissions(pid
, task
, 2)) {
1704 * This doesn't prevent learning whether PID exists,
1705 * it only makes getattr() consistent with readdir().
1709 if ((inode
->i_mode
== (S_IFDIR
|S_IRUGO
|S_IXUGO
)) ||
1710 task_dumpable(task
)) {
1711 cred
= __task_cred(task
);
1712 stat
->uid
= cred
->euid
;
1713 stat
->gid
= cred
->egid
;
1723 * Exceptional case: normally we are not allowed to unhash a busy
1724 * directory. In this case, however, we can do it - no aliasing problems
1725 * due to the way we treat inodes.
1727 * Rewrite the inode's ownerships here because the owning task may have
1728 * performed a setuid(), etc.
1730 * Before the /proc/pid/status file was created the only way to read
1731 * the effective uid of a /process was to stat /proc/pid. Reading
1732 * /proc/pid/status is slow enough that procps and other packages
1733 * kept stating /proc/pid. To keep the rules in /proc simple I have
1734 * made this apply to all per process world readable and executable
1737 int pid_revalidate(struct dentry
*dentry
, unsigned int flags
)
1739 struct inode
*inode
;
1740 struct task_struct
*task
;
1741 const struct cred
*cred
;
1743 if (flags
& LOOKUP_RCU
)
1746 inode
= d_inode(dentry
);
1747 task
= get_proc_task(inode
);
1750 if ((inode
->i_mode
== (S_IFDIR
|S_IRUGO
|S_IXUGO
)) ||
1751 task_dumpable(task
)) {
1753 cred
= __task_cred(task
);
1754 inode
->i_uid
= cred
->euid
;
1755 inode
->i_gid
= cred
->egid
;
1758 inode
->i_uid
= GLOBAL_ROOT_UID
;
1759 inode
->i_gid
= GLOBAL_ROOT_GID
;
1761 inode
->i_mode
&= ~(S_ISUID
| S_ISGID
);
1762 security_task_to_inode(task
, inode
);
1763 put_task_struct(task
);
1769 static inline bool proc_inode_is_dead(struct inode
*inode
)
1771 return !proc_pid(inode
)->tasks
[PIDTYPE_PID
].first
;
1774 int pid_delete_dentry(const struct dentry
*dentry
)
1776 /* Is the task we represent dead?
1777 * If so, then don't put the dentry on the lru list,
1778 * kill it immediately.
1780 return proc_inode_is_dead(d_inode(dentry
));
1783 const struct dentry_operations pid_dentry_operations
=
1785 .d_revalidate
= pid_revalidate
,
1786 .d_delete
= pid_delete_dentry
,
1792 * Fill a directory entry.
1794 * If possible create the dcache entry and derive our inode number and
1795 * file type from dcache entry.
1797 * Since all of the proc inode numbers are dynamically generated, the inode
1798 * numbers do not exist until the inode is cache. This means creating the
1799 * the dcache entry in readdir is necessary to keep the inode numbers
1800 * reported by readdir in sync with the inode numbers reported
1803 bool proc_fill_cache(struct file
*file
, struct dir_context
*ctx
,
1804 const char *name
, int len
,
1805 instantiate_t instantiate
, struct task_struct
*task
, const void *ptr
)
1807 struct dentry
*child
, *dir
= file
->f_path
.dentry
;
1808 struct qstr qname
= QSTR_INIT(name
, len
);
1809 struct inode
*inode
;
1813 child
= d_hash_and_lookup(dir
, &qname
);
1815 child
= d_alloc(dir
, &qname
);
1817 goto end_instantiate
;
1818 if (instantiate(d_inode(dir
), child
, task
, ptr
) < 0) {
1820 goto end_instantiate
;
1823 inode
= d_inode(child
);
1825 type
= inode
->i_mode
>> 12;
1827 return dir_emit(ctx
, name
, len
, ino
, type
);
1830 return dir_emit(ctx
, name
, len
, 1, DT_UNKNOWN
);
1834 * dname_to_vma_addr - maps a dentry name into two unsigned longs
1835 * which represent vma start and end addresses.
1837 static int dname_to_vma_addr(struct dentry
*dentry
,
1838 unsigned long *start
, unsigned long *end
)
1840 if (sscanf(dentry
->d_name
.name
, "%lx-%lx", start
, end
) != 2)
1846 static int map_files_d_revalidate(struct dentry
*dentry
, unsigned int flags
)
1848 unsigned long vm_start
, vm_end
;
1849 bool exact_vma_exists
= false;
1850 struct mm_struct
*mm
= NULL
;
1851 struct task_struct
*task
;
1852 const struct cred
*cred
;
1853 struct inode
*inode
;
1856 if (flags
& LOOKUP_RCU
)
1859 inode
= d_inode(dentry
);
1860 task
= get_proc_task(inode
);
1864 mm
= mm_access(task
, PTRACE_MODE_READ_FSCREDS
);
1865 if (IS_ERR_OR_NULL(mm
))
1868 if (!dname_to_vma_addr(dentry
, &vm_start
, &vm_end
)) {
1869 down_read(&mm
->mmap_sem
);
1870 exact_vma_exists
= !!find_exact_vma(mm
, vm_start
, vm_end
);
1871 up_read(&mm
->mmap_sem
);
1876 if (exact_vma_exists
) {
1877 if (task_dumpable(task
)) {
1879 cred
= __task_cred(task
);
1880 inode
->i_uid
= cred
->euid
;
1881 inode
->i_gid
= cred
->egid
;
1884 inode
->i_uid
= GLOBAL_ROOT_UID
;
1885 inode
->i_gid
= GLOBAL_ROOT_GID
;
1887 security_task_to_inode(task
, inode
);
1892 put_task_struct(task
);
1898 static const struct dentry_operations tid_map_files_dentry_operations
= {
1899 .d_revalidate
= map_files_d_revalidate
,
1900 .d_delete
= pid_delete_dentry
,
1903 static int map_files_get_link(struct dentry
*dentry
, struct path
*path
)
1905 unsigned long vm_start
, vm_end
;
1906 struct vm_area_struct
*vma
;
1907 struct task_struct
*task
;
1908 struct mm_struct
*mm
;
1912 task
= get_proc_task(d_inode(dentry
));
1916 mm
= get_task_mm(task
);
1917 put_task_struct(task
);
1921 rc
= dname_to_vma_addr(dentry
, &vm_start
, &vm_end
);
1926 down_read(&mm
->mmap_sem
);
1927 vma
= find_exact_vma(mm
, vm_start
, vm_end
);
1928 if (vma
&& vma
->vm_file
) {
1929 *path
= vma
->vm_file
->f_path
;
1933 up_read(&mm
->mmap_sem
);
1941 struct map_files_info
{
1944 unsigned char name
[4*sizeof(long)+2]; /* max: %lx-%lx\0 */
1948 * Only allow CAP_SYS_ADMIN to follow the links, due to concerns about how the
1949 * symlinks may be used to bypass permissions on ancestor directories in the
1950 * path to the file in question.
1953 proc_map_files_get_link(struct dentry
*dentry
,
1954 struct inode
*inode
,
1955 struct delayed_call
*done
)
1957 if (!capable(CAP_SYS_ADMIN
))
1958 return ERR_PTR(-EPERM
);
1960 return proc_pid_get_link(dentry
, inode
, done
);
1964 * Identical to proc_pid_link_inode_operations except for get_link()
1966 static const struct inode_operations proc_map_files_link_inode_operations
= {
1967 .readlink
= proc_pid_readlink
,
1968 .get_link
= proc_map_files_get_link
,
1969 .setattr
= proc_setattr
,
1973 proc_map_files_instantiate(struct inode
*dir
, struct dentry
*dentry
,
1974 struct task_struct
*task
, const void *ptr
)
1976 fmode_t mode
= (fmode_t
)(unsigned long)ptr
;
1977 struct proc_inode
*ei
;
1978 struct inode
*inode
;
1980 inode
= proc_pid_make_inode(dir
->i_sb
, task
);
1985 ei
->op
.proc_get_link
= map_files_get_link
;
1987 inode
->i_op
= &proc_map_files_link_inode_operations
;
1989 inode
->i_mode
= S_IFLNK
;
1991 if (mode
& FMODE_READ
)
1992 inode
->i_mode
|= S_IRUSR
;
1993 if (mode
& FMODE_WRITE
)
1994 inode
->i_mode
|= S_IWUSR
;
1996 d_set_d_op(dentry
, &tid_map_files_dentry_operations
);
1997 d_add(dentry
, inode
);
2002 static struct dentry
*proc_map_files_lookup(struct inode
*dir
,
2003 struct dentry
*dentry
, unsigned int flags
)
2005 unsigned long vm_start
, vm_end
;
2006 struct vm_area_struct
*vma
;
2007 struct task_struct
*task
;
2009 struct mm_struct
*mm
;
2012 task
= get_proc_task(dir
);
2017 if (!ptrace_may_access(task
, PTRACE_MODE_READ_FSCREDS
))
2021 if (dname_to_vma_addr(dentry
, &vm_start
, &vm_end
))
2024 mm
= get_task_mm(task
);
2028 down_read(&mm
->mmap_sem
);
2029 vma
= find_exact_vma(mm
, vm_start
, vm_end
);
2034 result
= proc_map_files_instantiate(dir
, dentry
, task
,
2035 (void *)(unsigned long)vma
->vm_file
->f_mode
);
2038 up_read(&mm
->mmap_sem
);
2041 put_task_struct(task
);
2043 return ERR_PTR(result
);
2046 static const struct inode_operations proc_map_files_inode_operations
= {
2047 .lookup
= proc_map_files_lookup
,
2048 .permission
= proc_fd_permission
,
2049 .setattr
= proc_setattr
,
2053 proc_map_files_readdir(struct file
*file
, struct dir_context
*ctx
)
2055 struct vm_area_struct
*vma
;
2056 struct task_struct
*task
;
2057 struct mm_struct
*mm
;
2058 unsigned long nr_files
, pos
, i
;
2059 struct flex_array
*fa
= NULL
;
2060 struct map_files_info info
;
2061 struct map_files_info
*p
;
2065 task
= get_proc_task(file_inode(file
));
2070 if (!ptrace_may_access(task
, PTRACE_MODE_READ_FSCREDS
))
2074 if (!dir_emit_dots(file
, ctx
))
2077 mm
= get_task_mm(task
);
2080 down_read(&mm
->mmap_sem
);
2085 * We need two passes here:
2087 * 1) Collect vmas of mapped files with mmap_sem taken
2088 * 2) Release mmap_sem and instantiate entries
2090 * otherwise we get lockdep complained, since filldir()
2091 * routine might require mmap_sem taken in might_fault().
2094 for (vma
= mm
->mmap
, pos
= 2; vma
; vma
= vma
->vm_next
) {
2095 if (vma
->vm_file
&& ++pos
> ctx
->pos
)
2100 fa
= flex_array_alloc(sizeof(info
), nr_files
,
2102 if (!fa
|| flex_array_prealloc(fa
, 0, nr_files
,
2106 flex_array_free(fa
);
2107 up_read(&mm
->mmap_sem
);
2111 for (i
= 0, vma
= mm
->mmap
, pos
= 2; vma
;
2112 vma
= vma
->vm_next
) {
2115 if (++pos
<= ctx
->pos
)
2118 info
.mode
= vma
->vm_file
->f_mode
;
2119 info
.len
= snprintf(info
.name
,
2120 sizeof(info
.name
), "%lx-%lx",
2121 vma
->vm_start
, vma
->vm_end
);
2122 if (flex_array_put(fa
, i
++, &info
, GFP_KERNEL
))
2126 up_read(&mm
->mmap_sem
);
2128 for (i
= 0; i
< nr_files
; i
++) {
2129 p
= flex_array_get(fa
, i
);
2130 if (!proc_fill_cache(file
, ctx
,
2132 proc_map_files_instantiate
,
2134 (void *)(unsigned long)p
->mode
))
2139 flex_array_free(fa
);
2143 put_task_struct(task
);
2148 static const struct file_operations proc_map_files_operations
= {
2149 .read
= generic_read_dir
,
2150 .iterate
= proc_map_files_readdir
,
2151 .llseek
= default_llseek
,
2154 struct timers_private
{
2156 struct task_struct
*task
;
2157 struct sighand_struct
*sighand
;
2158 struct pid_namespace
*ns
;
2159 unsigned long flags
;
2162 static void *timers_start(struct seq_file
*m
, loff_t
*pos
)
2164 struct timers_private
*tp
= m
->private;
2166 tp
->task
= get_pid_task(tp
->pid
, PIDTYPE_PID
);
2168 return ERR_PTR(-ESRCH
);
2170 tp
->sighand
= lock_task_sighand(tp
->task
, &tp
->flags
);
2172 return ERR_PTR(-ESRCH
);
2174 return seq_list_start(&tp
->task
->signal
->posix_timers
, *pos
);
2177 static void *timers_next(struct seq_file
*m
, void *v
, loff_t
*pos
)
2179 struct timers_private
*tp
= m
->private;
2180 return seq_list_next(v
, &tp
->task
->signal
->posix_timers
, pos
);
2183 static void timers_stop(struct seq_file
*m
, void *v
)
2185 struct timers_private
*tp
= m
->private;
2188 unlock_task_sighand(tp
->task
, &tp
->flags
);
2193 put_task_struct(tp
->task
);
2198 static int show_timer(struct seq_file
*m
, void *v
)
2200 struct k_itimer
*timer
;
2201 struct timers_private
*tp
= m
->private;
2203 static const char * const nstr
[] = {
2204 [SIGEV_SIGNAL
] = "signal",
2205 [SIGEV_NONE
] = "none",
2206 [SIGEV_THREAD
] = "thread",
2209 timer
= list_entry((struct list_head
*)v
, struct k_itimer
, list
);
2210 notify
= timer
->it_sigev_notify
;
2212 seq_printf(m
, "ID: %d\n", timer
->it_id
);
2213 seq_printf(m
, "signal: %d/%p\n",
2214 timer
->sigq
->info
.si_signo
,
2215 timer
->sigq
->info
.si_value
.sival_ptr
);
2216 seq_printf(m
, "notify: %s/%s.%d\n",
2217 nstr
[notify
& ~SIGEV_THREAD_ID
],
2218 (notify
& SIGEV_THREAD_ID
) ? "tid" : "pid",
2219 pid_nr_ns(timer
->it_pid
, tp
->ns
));
2220 seq_printf(m
, "ClockID: %d\n", timer
->it_clock
);
2225 static const struct seq_operations proc_timers_seq_ops
= {
2226 .start
= timers_start
,
2227 .next
= timers_next
,
2228 .stop
= timers_stop
,
2232 static int proc_timers_open(struct inode
*inode
, struct file
*file
)
2234 struct timers_private
*tp
;
2236 tp
= __seq_open_private(file
, &proc_timers_seq_ops
,
2237 sizeof(struct timers_private
));
2241 tp
->pid
= proc_pid(inode
);
2242 tp
->ns
= inode
->i_sb
->s_fs_info
;
2246 static const struct file_operations proc_timers_operations
= {
2247 .open
= proc_timers_open
,
2249 .llseek
= seq_lseek
,
2250 .release
= seq_release_private
,
2253 static int proc_pident_instantiate(struct inode
*dir
,
2254 struct dentry
*dentry
, struct task_struct
*task
, const void *ptr
)
2256 const struct pid_entry
*p
= ptr
;
2257 struct inode
*inode
;
2258 struct proc_inode
*ei
;
2260 inode
= proc_pid_make_inode(dir
->i_sb
, task
);
2265 inode
->i_mode
= p
->mode
;
2266 if (S_ISDIR(inode
->i_mode
))
2267 set_nlink(inode
, 2); /* Use getattr to fix if necessary */
2269 inode
->i_op
= p
->iop
;
2271 inode
->i_fop
= p
->fop
;
2273 d_set_d_op(dentry
, &pid_dentry_operations
);
2274 d_add(dentry
, inode
);
2275 /* Close the race of the process dying before we return the dentry */
2276 if (pid_revalidate(dentry
, 0))
2282 static struct dentry
*proc_pident_lookup(struct inode
*dir
,
2283 struct dentry
*dentry
,
2284 const struct pid_entry
*ents
,
2288 struct task_struct
*task
= get_proc_task(dir
);
2289 const struct pid_entry
*p
, *last
;
2297 * Yes, it does not scale. And it should not. Don't add
2298 * new entries into /proc/<tgid>/ without very good reasons.
2300 last
= &ents
[nents
- 1];
2301 for (p
= ents
; p
<= last
; p
++) {
2302 if (p
->len
!= dentry
->d_name
.len
)
2304 if (!memcmp(dentry
->d_name
.name
, p
->name
, p
->len
))
2310 error
= proc_pident_instantiate(dir
, dentry
, task
, p
);
2312 put_task_struct(task
);
2314 return ERR_PTR(error
);
2317 static int proc_pident_readdir(struct file
*file
, struct dir_context
*ctx
,
2318 const struct pid_entry
*ents
, unsigned int nents
)
2320 struct task_struct
*task
= get_proc_task(file_inode(file
));
2321 const struct pid_entry
*p
;
2326 if (!dir_emit_dots(file
, ctx
))
2329 if (ctx
->pos
>= nents
+ 2)
2332 for (p
= ents
+ (ctx
->pos
- 2); p
<= ents
+ nents
- 1; p
++) {
2333 if (!proc_fill_cache(file
, ctx
, p
->name
, p
->len
,
2334 proc_pident_instantiate
, task
, p
))
2339 put_task_struct(task
);
2343 #ifdef CONFIG_SECURITY
2344 static ssize_t
proc_pid_attr_read(struct file
* file
, char __user
* buf
,
2345 size_t count
, loff_t
*ppos
)
2347 struct inode
* inode
= file_inode(file
);
2350 struct task_struct
*task
= get_proc_task(inode
);
2355 length
= security_getprocattr(task
,
2356 (char*)file
->f_path
.dentry
->d_name
.name
,
2358 put_task_struct(task
);
2360 length
= simple_read_from_buffer(buf
, count
, ppos
, p
, length
);
2365 static ssize_t
proc_pid_attr_write(struct file
* file
, const char __user
* buf
,
2366 size_t count
, loff_t
*ppos
)
2368 struct inode
* inode
= file_inode(file
);
2371 struct task_struct
*task
= get_proc_task(inode
);
2376 if (count
> PAGE_SIZE
)
2379 /* No partial writes. */
2384 page
= memdup_user(buf
, count
);
2386 length
= PTR_ERR(page
);
2390 /* Guard against adverse ptrace interaction */
2391 length
= mutex_lock_interruptible(&task
->signal
->cred_guard_mutex
);
2395 length
= security_setprocattr(task
,
2396 (char*)file
->f_path
.dentry
->d_name
.name
,
2398 mutex_unlock(&task
->signal
->cred_guard_mutex
);
2402 put_task_struct(task
);
2407 static const struct file_operations proc_pid_attr_operations
= {
2408 .read
= proc_pid_attr_read
,
2409 .write
= proc_pid_attr_write
,
2410 .llseek
= generic_file_llseek
,
2413 static const struct pid_entry attr_dir_stuff
[] = {
2414 REG("current", S_IRUGO
|S_IWUGO
, proc_pid_attr_operations
),
2415 REG("prev", S_IRUGO
, proc_pid_attr_operations
),
2416 REG("exec", S_IRUGO
|S_IWUGO
, proc_pid_attr_operations
),
2417 REG("fscreate", S_IRUGO
|S_IWUGO
, proc_pid_attr_operations
),
2418 REG("keycreate", S_IRUGO
|S_IWUGO
, proc_pid_attr_operations
),
2419 REG("sockcreate", S_IRUGO
|S_IWUGO
, proc_pid_attr_operations
),
2422 static int proc_attr_dir_readdir(struct file
*file
, struct dir_context
*ctx
)
2424 return proc_pident_readdir(file
, ctx
,
2425 attr_dir_stuff
, ARRAY_SIZE(attr_dir_stuff
));
2428 static const struct file_operations proc_attr_dir_operations
= {
2429 .read
= generic_read_dir
,
2430 .iterate
= proc_attr_dir_readdir
,
2431 .llseek
= default_llseek
,
2434 static struct dentry
*proc_attr_dir_lookup(struct inode
*dir
,
2435 struct dentry
*dentry
, unsigned int flags
)
2437 return proc_pident_lookup(dir
, dentry
,
2438 attr_dir_stuff
, ARRAY_SIZE(attr_dir_stuff
));
2441 static const struct inode_operations proc_attr_dir_inode_operations
= {
2442 .lookup
= proc_attr_dir_lookup
,
2443 .getattr
= pid_getattr
,
2444 .setattr
= proc_setattr
,
2449 #ifdef CONFIG_ELF_CORE
2450 static ssize_t
proc_coredump_filter_read(struct file
*file
, char __user
*buf
,
2451 size_t count
, loff_t
*ppos
)
2453 struct task_struct
*task
= get_proc_task(file_inode(file
));
2454 struct mm_struct
*mm
;
2455 char buffer
[PROC_NUMBUF
];
2463 mm
= get_task_mm(task
);
2465 len
= snprintf(buffer
, sizeof(buffer
), "%08lx\n",
2466 ((mm
->flags
& MMF_DUMP_FILTER_MASK
) >>
2467 MMF_DUMP_FILTER_SHIFT
));
2469 ret
= simple_read_from_buffer(buf
, count
, ppos
, buffer
, len
);
2472 put_task_struct(task
);
2477 static ssize_t
proc_coredump_filter_write(struct file
*file
,
2478 const char __user
*buf
,
2482 struct task_struct
*task
;
2483 struct mm_struct
*mm
;
2489 ret
= kstrtouint_from_user(buf
, count
, 0, &val
);
2494 task
= get_proc_task(file_inode(file
));
2498 mm
= get_task_mm(task
);
2503 for (i
= 0, mask
= 1; i
< MMF_DUMP_FILTER_BITS
; i
++, mask
<<= 1) {
2505 set_bit(i
+ MMF_DUMP_FILTER_SHIFT
, &mm
->flags
);
2507 clear_bit(i
+ MMF_DUMP_FILTER_SHIFT
, &mm
->flags
);
2512 put_task_struct(task
);
2519 static const struct file_operations proc_coredump_filter_operations
= {
2520 .read
= proc_coredump_filter_read
,
2521 .write
= proc_coredump_filter_write
,
2522 .llseek
= generic_file_llseek
,
2526 #ifdef CONFIG_TASK_IO_ACCOUNTING
2527 static int do_io_accounting(struct task_struct
*task
, struct seq_file
*m
, int whole
)
2529 struct task_io_accounting acct
= task
->ioac
;
2530 unsigned long flags
;
2533 result
= mutex_lock_killable(&task
->signal
->cred_guard_mutex
);
2537 if (!ptrace_may_access(task
, PTRACE_MODE_READ_FSCREDS
)) {
2542 if (whole
&& lock_task_sighand(task
, &flags
)) {
2543 struct task_struct
*t
= task
;
2545 task_io_accounting_add(&acct
, &task
->signal
->ioac
);
2546 while_each_thread(task
, t
)
2547 task_io_accounting_add(&acct
, &t
->ioac
);
2549 unlock_task_sighand(task
, &flags
);
2556 "read_bytes: %llu\n"
2557 "write_bytes: %llu\n"
2558 "cancelled_write_bytes: %llu\n",
2559 (unsigned long long)acct
.rchar
,
2560 (unsigned long long)acct
.wchar
,
2561 (unsigned long long)acct
.syscr
,
2562 (unsigned long long)acct
.syscw
,
2563 (unsigned long long)acct
.read_bytes
,
2564 (unsigned long long)acct
.write_bytes
,
2565 (unsigned long long)acct
.cancelled_write_bytes
);
2569 mutex_unlock(&task
->signal
->cred_guard_mutex
);
2573 static int proc_tid_io_accounting(struct seq_file
*m
, struct pid_namespace
*ns
,
2574 struct pid
*pid
, struct task_struct
*task
)
2576 return do_io_accounting(task
, m
, 0);
2579 static int proc_tgid_io_accounting(struct seq_file
*m
, struct pid_namespace
*ns
,
2580 struct pid
*pid
, struct task_struct
*task
)
2582 return do_io_accounting(task
, m
, 1);
2584 #endif /* CONFIG_TASK_IO_ACCOUNTING */
2586 #ifdef CONFIG_USER_NS
2587 static int proc_id_map_open(struct inode
*inode
, struct file
*file
,
2588 const struct seq_operations
*seq_ops
)
2590 struct user_namespace
*ns
= NULL
;
2591 struct task_struct
*task
;
2592 struct seq_file
*seq
;
2595 task
= get_proc_task(inode
);
2598 ns
= get_user_ns(task_cred_xxx(task
, user_ns
));
2600 put_task_struct(task
);
2605 ret
= seq_open(file
, seq_ops
);
2609 seq
= file
->private_data
;
2619 static int proc_id_map_release(struct inode
*inode
, struct file
*file
)
2621 struct seq_file
*seq
= file
->private_data
;
2622 struct user_namespace
*ns
= seq
->private;
2624 return seq_release(inode
, file
);
2627 static int proc_uid_map_open(struct inode
*inode
, struct file
*file
)
2629 return proc_id_map_open(inode
, file
, &proc_uid_seq_operations
);
2632 static int proc_gid_map_open(struct inode
*inode
, struct file
*file
)
2634 return proc_id_map_open(inode
, file
, &proc_gid_seq_operations
);
2637 static int proc_projid_map_open(struct inode
*inode
, struct file
*file
)
2639 return proc_id_map_open(inode
, file
, &proc_projid_seq_operations
);
2642 static const struct file_operations proc_uid_map_operations
= {
2643 .open
= proc_uid_map_open
,
2644 .write
= proc_uid_map_write
,
2646 .llseek
= seq_lseek
,
2647 .release
= proc_id_map_release
,
2650 static const struct file_operations proc_gid_map_operations
= {
2651 .open
= proc_gid_map_open
,
2652 .write
= proc_gid_map_write
,
2654 .llseek
= seq_lseek
,
2655 .release
= proc_id_map_release
,
2658 static const struct file_operations proc_projid_map_operations
= {
2659 .open
= proc_projid_map_open
,
2660 .write
= proc_projid_map_write
,
2662 .llseek
= seq_lseek
,
2663 .release
= proc_id_map_release
,
2666 static int proc_setgroups_open(struct inode
*inode
, struct file
*file
)
2668 struct user_namespace
*ns
= NULL
;
2669 struct task_struct
*task
;
2673 task
= get_proc_task(inode
);
2676 ns
= get_user_ns(task_cred_xxx(task
, user_ns
));
2678 put_task_struct(task
);
2683 if (file
->f_mode
& FMODE_WRITE
) {
2685 if (!ns_capable(ns
, CAP_SYS_ADMIN
))
2689 ret
= single_open(file
, &proc_setgroups_show
, ns
);
2700 static int proc_setgroups_release(struct inode
*inode
, struct file
*file
)
2702 struct seq_file
*seq
= file
->private_data
;
2703 struct user_namespace
*ns
= seq
->private;
2704 int ret
= single_release(inode
, file
);
2709 static const struct file_operations proc_setgroups_operations
= {
2710 .open
= proc_setgroups_open
,
2711 .write
= proc_setgroups_write
,
2713 .llseek
= seq_lseek
,
2714 .release
= proc_setgroups_release
,
2716 #endif /* CONFIG_USER_NS */
2718 static int proc_pid_personality(struct seq_file
*m
, struct pid_namespace
*ns
,
2719 struct pid
*pid
, struct task_struct
*task
)
2721 int err
= lock_trace(task
);
2723 seq_printf(m
, "%08x\n", task
->personality
);
2732 static const struct file_operations proc_task_operations
;
2733 static const struct inode_operations proc_task_inode_operations
;
2735 static const struct pid_entry tgid_base_stuff
[] = {
2736 DIR("task", S_IRUGO
|S_IXUGO
, proc_task_inode_operations
, proc_task_operations
),
2737 DIR("fd", S_IRUSR
|S_IXUSR
, proc_fd_inode_operations
, proc_fd_operations
),
2738 DIR("map_files", S_IRUSR
|S_IXUSR
, proc_map_files_inode_operations
, proc_map_files_operations
),
2739 DIR("fdinfo", S_IRUSR
|S_IXUSR
, proc_fdinfo_inode_operations
, proc_fdinfo_operations
),
2740 DIR("ns", S_IRUSR
|S_IXUGO
, proc_ns_dir_inode_operations
, proc_ns_dir_operations
),
2742 DIR("net", S_IRUGO
|S_IXUGO
, proc_net_inode_operations
, proc_net_operations
),
2744 REG("environ", S_IRUSR
, proc_environ_operations
),
2745 ONE("auxv", S_IRUSR
, proc_pid_auxv
),
2746 ONE("status", S_IRUGO
, proc_pid_status
),
2747 ONE("personality", S_IRUSR
, proc_pid_personality
),
2748 ONE("limits", S_IRUGO
, proc_pid_limits
),
2749 #ifdef CONFIG_SCHED_DEBUG
2750 REG("sched", S_IRUGO
|S_IWUSR
, proc_pid_sched_operations
),
2752 #ifdef CONFIG_SCHED_AUTOGROUP
2753 REG("autogroup", S_IRUGO
|S_IWUSR
, proc_pid_sched_autogroup_operations
),
2755 REG("comm", S_IRUGO
|S_IWUSR
, proc_pid_set_comm_operations
),
2756 #ifdef CONFIG_HAVE_ARCH_TRACEHOOK
2757 ONE("syscall", S_IRUSR
, proc_pid_syscall
),
2759 REG("cmdline", S_IRUGO
, proc_pid_cmdline_ops
),
2760 ONE("stat", S_IRUGO
, proc_tgid_stat
),
2761 ONE("statm", S_IRUGO
, proc_pid_statm
),
2762 REG("maps", S_IRUGO
, proc_pid_maps_operations
),
2764 REG("numa_maps", S_IRUGO
, proc_pid_numa_maps_operations
),
2766 REG("mem", S_IRUSR
|S_IWUSR
, proc_mem_operations
),
2767 LNK("cwd", proc_cwd_link
),
2768 LNK("root", proc_root_link
),
2769 LNK("exe", proc_exe_link
),
2770 REG("mounts", S_IRUGO
, proc_mounts_operations
),
2771 REG("mountinfo", S_IRUGO
, proc_mountinfo_operations
),
2772 REG("mountstats", S_IRUSR
, proc_mountstats_operations
),
2773 #ifdef CONFIG_PROC_PAGE_MONITOR
2774 REG("clear_refs", S_IWUSR
, proc_clear_refs_operations
),
2775 REG("smaps", S_IRUGO
, proc_pid_smaps_operations
),
2776 REG("pagemap", S_IRUSR
, proc_pagemap_operations
),
2778 #ifdef CONFIG_SECURITY
2779 DIR("attr", S_IRUGO
|S_IXUGO
, proc_attr_dir_inode_operations
, proc_attr_dir_operations
),
2781 #ifdef CONFIG_KALLSYMS
2782 ONE("wchan", S_IRUGO
, proc_pid_wchan
),
2784 #ifdef CONFIG_STACKTRACE
2785 ONE("stack", S_IRUSR
, proc_pid_stack
),
2787 #ifdef CONFIG_SCHED_INFO
2788 ONE("schedstat", S_IRUGO
, proc_pid_schedstat
),
2790 #ifdef CONFIG_LATENCYTOP
2791 REG("latency", S_IRUGO
, proc_lstats_operations
),
2793 #ifdef CONFIG_PROC_PID_CPUSET
2794 ONE("cpuset", S_IRUGO
, proc_cpuset_show
),
2796 #ifdef CONFIG_CGROUPS
2797 ONE("cgroup", S_IRUGO
, proc_cgroup_show
),
2799 ONE("oom_score", S_IRUGO
, proc_oom_score
),
2800 REG("oom_adj", S_IRUGO
|S_IWUSR
, proc_oom_adj_operations
),
2801 REG("oom_score_adj", S_IRUGO
|S_IWUSR
, proc_oom_score_adj_operations
),
2802 #ifdef CONFIG_AUDITSYSCALL
2803 REG("loginuid", S_IWUSR
|S_IRUGO
, proc_loginuid_operations
),
2804 REG("sessionid", S_IRUGO
, proc_sessionid_operations
),
2806 #ifdef CONFIG_FAULT_INJECTION
2807 REG("make-it-fail", S_IRUGO
|S_IWUSR
, proc_fault_inject_operations
),
2809 #ifdef CONFIG_ELF_CORE
2810 REG("coredump_filter", S_IRUGO
|S_IWUSR
, proc_coredump_filter_operations
),
2812 #ifdef CONFIG_TASK_IO_ACCOUNTING
2813 ONE("io", S_IRUSR
, proc_tgid_io_accounting
),
2815 #ifdef CONFIG_HARDWALL
2816 ONE("hardwall", S_IRUGO
, proc_pid_hardwall
),
2818 #ifdef CONFIG_USER_NS
2819 REG("uid_map", S_IRUGO
|S_IWUSR
, proc_uid_map_operations
),
2820 REG("gid_map", S_IRUGO
|S_IWUSR
, proc_gid_map_operations
),
2821 REG("projid_map", S_IRUGO
|S_IWUSR
, proc_projid_map_operations
),
2822 REG("setgroups", S_IRUGO
|S_IWUSR
, proc_setgroups_operations
),
2824 #ifdef CONFIG_CHECKPOINT_RESTORE
2825 REG("timers", S_IRUGO
, proc_timers_operations
),
2829 static int proc_tgid_base_readdir(struct file
*file
, struct dir_context
*ctx
)
2831 return proc_pident_readdir(file
, ctx
,
2832 tgid_base_stuff
, ARRAY_SIZE(tgid_base_stuff
));
2835 static const struct file_operations proc_tgid_base_operations
= {
2836 .read
= generic_read_dir
,
2837 .iterate
= proc_tgid_base_readdir
,
2838 .llseek
= default_llseek
,
2841 static struct dentry
*proc_tgid_base_lookup(struct inode
*dir
, struct dentry
*dentry
, unsigned int flags
)
2843 return proc_pident_lookup(dir
, dentry
,
2844 tgid_base_stuff
, ARRAY_SIZE(tgid_base_stuff
));
2847 static const struct inode_operations proc_tgid_base_inode_operations
= {
2848 .lookup
= proc_tgid_base_lookup
,
2849 .getattr
= pid_getattr
,
2850 .setattr
= proc_setattr
,
2851 .permission
= proc_pid_permission
,
2854 static void proc_flush_task_mnt(struct vfsmount
*mnt
, pid_t pid
, pid_t tgid
)
2856 struct dentry
*dentry
, *leader
, *dir
;
2857 char buf
[PROC_NUMBUF
];
2861 name
.len
= snprintf(buf
, sizeof(buf
), "%d", pid
);
2862 /* no ->d_hash() rejects on procfs */
2863 dentry
= d_hash_and_lookup(mnt
->mnt_root
, &name
);
2865 d_invalidate(dentry
);
2873 name
.len
= snprintf(buf
, sizeof(buf
), "%d", tgid
);
2874 leader
= d_hash_and_lookup(mnt
->mnt_root
, &name
);
2879 name
.len
= strlen(name
.name
);
2880 dir
= d_hash_and_lookup(leader
, &name
);
2882 goto out_put_leader
;
2885 name
.len
= snprintf(buf
, sizeof(buf
), "%d", pid
);
2886 dentry
= d_hash_and_lookup(dir
, &name
);
2888 d_invalidate(dentry
);
2900 * proc_flush_task - Remove dcache entries for @task from the /proc dcache.
2901 * @task: task that should be flushed.
2903 * When flushing dentries from proc, one needs to flush them from global
2904 * proc (proc_mnt) and from all the namespaces' procs this task was seen
2905 * in. This call is supposed to do all of this job.
2907 * Looks in the dcache for
2909 * /proc/@tgid/task/@pid
2910 * if either directory is present flushes it and all of it'ts children
2913 * It is safe and reasonable to cache /proc entries for a task until
2914 * that task exits. After that they just clog up the dcache with
2915 * useless entries, possibly causing useful dcache entries to be
2916 * flushed instead. This routine is proved to flush those useless
2917 * dcache entries at process exit time.
2919 * NOTE: This routine is just an optimization so it does not guarantee
2920 * that no dcache entries will exist at process exit time it
2921 * just makes it very unlikely that any will persist.
2924 void proc_flush_task(struct task_struct
*task
)
2927 struct pid
*pid
, *tgid
;
2930 pid
= task_pid(task
);
2931 tgid
= task_tgid(task
);
2933 for (i
= 0; i
<= pid
->level
; i
++) {
2934 upid
= &pid
->numbers
[i
];
2935 proc_flush_task_mnt(upid
->ns
->proc_mnt
, upid
->nr
,
2936 tgid
->numbers
[i
].nr
);
2940 static int proc_pid_instantiate(struct inode
*dir
,
2941 struct dentry
* dentry
,
2942 struct task_struct
*task
, const void *ptr
)
2944 struct inode
*inode
;
2946 inode
= proc_pid_make_inode(dir
->i_sb
, task
);
2950 inode
->i_mode
= S_IFDIR
|S_IRUGO
|S_IXUGO
;
2951 inode
->i_op
= &proc_tgid_base_inode_operations
;
2952 inode
->i_fop
= &proc_tgid_base_operations
;
2953 inode
->i_flags
|=S_IMMUTABLE
;
2955 set_nlink(inode
, 2 + pid_entry_count_dirs(tgid_base_stuff
,
2956 ARRAY_SIZE(tgid_base_stuff
)));
2958 d_set_d_op(dentry
, &pid_dentry_operations
);
2960 d_add(dentry
, inode
);
2961 /* Close the race of the process dying before we return the dentry */
2962 if (pid_revalidate(dentry
, 0))
2968 struct dentry
*proc_pid_lookup(struct inode
*dir
, struct dentry
* dentry
, unsigned int flags
)
2970 int result
= -ENOENT
;
2971 struct task_struct
*task
;
2973 struct pid_namespace
*ns
;
2975 tgid
= name_to_int(&dentry
->d_name
);
2979 ns
= dentry
->d_sb
->s_fs_info
;
2981 task
= find_task_by_pid_ns(tgid
, ns
);
2983 get_task_struct(task
);
2988 result
= proc_pid_instantiate(dir
, dentry
, task
, NULL
);
2989 put_task_struct(task
);
2991 return ERR_PTR(result
);
2995 * Find the first task with tgid >= tgid
3000 struct task_struct
*task
;
3002 static struct tgid_iter
next_tgid(struct pid_namespace
*ns
, struct tgid_iter iter
)
3007 put_task_struct(iter
.task
);
3011 pid
= find_ge_pid(iter
.tgid
, ns
);
3013 iter
.tgid
= pid_nr_ns(pid
, ns
);
3014 iter
.task
= pid_task(pid
, PIDTYPE_PID
);
3015 /* What we to know is if the pid we have find is the
3016 * pid of a thread_group_leader. Testing for task
3017 * being a thread_group_leader is the obvious thing
3018 * todo but there is a window when it fails, due to
3019 * the pid transfer logic in de_thread.
3021 * So we perform the straight forward test of seeing
3022 * if the pid we have found is the pid of a thread
3023 * group leader, and don't worry if the task we have
3024 * found doesn't happen to be a thread group leader.
3025 * As we don't care in the case of readdir.
3027 if (!iter
.task
|| !has_group_leader_pid(iter
.task
)) {
3031 get_task_struct(iter
.task
);
3037 #define TGID_OFFSET (FIRST_PROCESS_ENTRY + 2)
3039 /* for the /proc/ directory itself, after non-process stuff has been done */
3040 int proc_pid_readdir(struct file
*file
, struct dir_context
*ctx
)
3042 struct tgid_iter iter
;
3043 struct pid_namespace
*ns
= file_inode(file
)->i_sb
->s_fs_info
;
3044 loff_t pos
= ctx
->pos
;
3046 if (pos
>= PID_MAX_LIMIT
+ TGID_OFFSET
)
3049 if (pos
== TGID_OFFSET
- 2) {
3050 struct inode
*inode
= d_inode(ns
->proc_self
);
3051 if (!dir_emit(ctx
, "self", 4, inode
->i_ino
, DT_LNK
))
3053 ctx
->pos
= pos
= pos
+ 1;
3055 if (pos
== TGID_OFFSET
- 1) {
3056 struct inode
*inode
= d_inode(ns
->proc_thread_self
);
3057 if (!dir_emit(ctx
, "thread-self", 11, inode
->i_ino
, DT_LNK
))
3059 ctx
->pos
= pos
= pos
+ 1;
3061 iter
.tgid
= pos
- TGID_OFFSET
;
3063 for (iter
= next_tgid(ns
, iter
);
3065 iter
.tgid
+= 1, iter
= next_tgid(ns
, iter
)) {
3066 char name
[PROC_NUMBUF
];
3068 if (!has_pid_permissions(ns
, iter
.task
, 2))
3071 len
= snprintf(name
, sizeof(name
), "%d", iter
.tgid
);
3072 ctx
->pos
= iter
.tgid
+ TGID_OFFSET
;
3073 if (!proc_fill_cache(file
, ctx
, name
, len
,
3074 proc_pid_instantiate
, iter
.task
, NULL
)) {
3075 put_task_struct(iter
.task
);
3079 ctx
->pos
= PID_MAX_LIMIT
+ TGID_OFFSET
;
3086 static const struct pid_entry tid_base_stuff
[] = {
3087 DIR("fd", S_IRUSR
|S_IXUSR
, proc_fd_inode_operations
, proc_fd_operations
),
3088 DIR("fdinfo", S_IRUSR
|S_IXUSR
, proc_fdinfo_inode_operations
, proc_fdinfo_operations
),
3089 DIR("ns", S_IRUSR
|S_IXUGO
, proc_ns_dir_inode_operations
, proc_ns_dir_operations
),
3091 DIR("net", S_IRUGO
|S_IXUGO
, proc_net_inode_operations
, proc_net_operations
),
3093 REG("environ", S_IRUSR
, proc_environ_operations
),
3094 ONE("auxv", S_IRUSR
, proc_pid_auxv
),
3095 ONE("status", S_IRUGO
, proc_pid_status
),
3096 ONE("personality", S_IRUSR
, proc_pid_personality
),
3097 ONE("limits", S_IRUGO
, proc_pid_limits
),
3098 #ifdef CONFIG_SCHED_DEBUG
3099 REG("sched", S_IRUGO
|S_IWUSR
, proc_pid_sched_operations
),
3101 REG("comm", S_IRUGO
|S_IWUSR
, proc_pid_set_comm_operations
),
3102 #ifdef CONFIG_HAVE_ARCH_TRACEHOOK
3103 ONE("syscall", S_IRUSR
, proc_pid_syscall
),
3105 REG("cmdline", S_IRUGO
, proc_pid_cmdline_ops
),
3106 ONE("stat", S_IRUGO
, proc_tid_stat
),
3107 ONE("statm", S_IRUGO
, proc_pid_statm
),
3108 REG("maps", S_IRUGO
, proc_tid_maps_operations
),
3109 #ifdef CONFIG_PROC_CHILDREN
3110 REG("children", S_IRUGO
, proc_tid_children_operations
),
3113 REG("numa_maps", S_IRUGO
, proc_tid_numa_maps_operations
),
3115 REG("mem", S_IRUSR
|S_IWUSR
, proc_mem_operations
),
3116 LNK("cwd", proc_cwd_link
),
3117 LNK("root", proc_root_link
),
3118 LNK("exe", proc_exe_link
),
3119 REG("mounts", S_IRUGO
, proc_mounts_operations
),
3120 REG("mountinfo", S_IRUGO
, proc_mountinfo_operations
),
3121 #ifdef CONFIG_PROC_PAGE_MONITOR
3122 REG("clear_refs", S_IWUSR
, proc_clear_refs_operations
),
3123 REG("smaps", S_IRUGO
, proc_tid_smaps_operations
),
3124 REG("pagemap", S_IRUSR
, proc_pagemap_operations
),
3126 #ifdef CONFIG_SECURITY
3127 DIR("attr", S_IRUGO
|S_IXUGO
, proc_attr_dir_inode_operations
, proc_attr_dir_operations
),
3129 #ifdef CONFIG_KALLSYMS
3130 ONE("wchan", S_IRUGO
, proc_pid_wchan
),
3132 #ifdef CONFIG_STACKTRACE
3133 ONE("stack", S_IRUSR
, proc_pid_stack
),
3135 #ifdef CONFIG_SCHED_INFO
3136 ONE("schedstat", S_IRUGO
, proc_pid_schedstat
),
3138 #ifdef CONFIG_LATENCYTOP
3139 REG("latency", S_IRUGO
, proc_lstats_operations
),
3141 #ifdef CONFIG_PROC_PID_CPUSET
3142 ONE("cpuset", S_IRUGO
, proc_cpuset_show
),
3144 #ifdef CONFIG_CGROUPS
3145 ONE("cgroup", S_IRUGO
, proc_cgroup_show
),
3147 ONE("oom_score", S_IRUGO
, proc_oom_score
),
3148 REG("oom_adj", S_IRUGO
|S_IWUSR
, proc_oom_adj_operations
),
3149 REG("oom_score_adj", S_IRUGO
|S_IWUSR
, proc_oom_score_adj_operations
),
3150 #ifdef CONFIG_AUDITSYSCALL
3151 REG("loginuid", S_IWUSR
|S_IRUGO
, proc_loginuid_operations
),
3152 REG("sessionid", S_IRUGO
, proc_sessionid_operations
),
3154 #ifdef CONFIG_FAULT_INJECTION
3155 REG("make-it-fail", S_IRUGO
|S_IWUSR
, proc_fault_inject_operations
),
3157 #ifdef CONFIG_TASK_IO_ACCOUNTING
3158 ONE("io", S_IRUSR
, proc_tid_io_accounting
),
3160 #ifdef CONFIG_HARDWALL
3161 ONE("hardwall", S_IRUGO
, proc_pid_hardwall
),
3163 #ifdef CONFIG_USER_NS
3164 REG("uid_map", S_IRUGO
|S_IWUSR
, proc_uid_map_operations
),
3165 REG("gid_map", S_IRUGO
|S_IWUSR
, proc_gid_map_operations
),
3166 REG("projid_map", S_IRUGO
|S_IWUSR
, proc_projid_map_operations
),
3167 REG("setgroups", S_IRUGO
|S_IWUSR
, proc_setgroups_operations
),
3171 static int proc_tid_base_readdir(struct file
*file
, struct dir_context
*ctx
)
3173 return proc_pident_readdir(file
, ctx
,
3174 tid_base_stuff
, ARRAY_SIZE(tid_base_stuff
));
3177 static struct dentry
*proc_tid_base_lookup(struct inode
*dir
, struct dentry
*dentry
, unsigned int flags
)
3179 return proc_pident_lookup(dir
, dentry
,
3180 tid_base_stuff
, ARRAY_SIZE(tid_base_stuff
));
3183 static const struct file_operations proc_tid_base_operations
= {
3184 .read
= generic_read_dir
,
3185 .iterate
= proc_tid_base_readdir
,
3186 .llseek
= default_llseek
,
3189 static const struct inode_operations proc_tid_base_inode_operations
= {
3190 .lookup
= proc_tid_base_lookup
,
3191 .getattr
= pid_getattr
,
3192 .setattr
= proc_setattr
,
3195 static int proc_task_instantiate(struct inode
*dir
,
3196 struct dentry
*dentry
, struct task_struct
*task
, const void *ptr
)
3198 struct inode
*inode
;
3199 inode
= proc_pid_make_inode(dir
->i_sb
, task
);
3203 inode
->i_mode
= S_IFDIR
|S_IRUGO
|S_IXUGO
;
3204 inode
->i_op
= &proc_tid_base_inode_operations
;
3205 inode
->i_fop
= &proc_tid_base_operations
;
3206 inode
->i_flags
|=S_IMMUTABLE
;
3208 set_nlink(inode
, 2 + pid_entry_count_dirs(tid_base_stuff
,
3209 ARRAY_SIZE(tid_base_stuff
)));
3211 d_set_d_op(dentry
, &pid_dentry_operations
);
3213 d_add(dentry
, inode
);
3214 /* Close the race of the process dying before we return the dentry */
3215 if (pid_revalidate(dentry
, 0))
3221 static struct dentry
*proc_task_lookup(struct inode
*dir
, struct dentry
* dentry
, unsigned int flags
)
3223 int result
= -ENOENT
;
3224 struct task_struct
*task
;
3225 struct task_struct
*leader
= get_proc_task(dir
);
3227 struct pid_namespace
*ns
;
3232 tid
= name_to_int(&dentry
->d_name
);
3236 ns
= dentry
->d_sb
->s_fs_info
;
3238 task
= find_task_by_pid_ns(tid
, ns
);
3240 get_task_struct(task
);
3244 if (!same_thread_group(leader
, task
))
3247 result
= proc_task_instantiate(dir
, dentry
, task
, NULL
);
3249 put_task_struct(task
);
3251 put_task_struct(leader
);
3253 return ERR_PTR(result
);
3257 * Find the first tid of a thread group to return to user space.
3259 * Usually this is just the thread group leader, but if the users
3260 * buffer was too small or there was a seek into the middle of the
3261 * directory we have more work todo.
3263 * In the case of a short read we start with find_task_by_pid.
3265 * In the case of a seek we start with the leader and walk nr
3268 static struct task_struct
*first_tid(struct pid
*pid
, int tid
, loff_t f_pos
,
3269 struct pid_namespace
*ns
)
3271 struct task_struct
*pos
, *task
;
3272 unsigned long nr
= f_pos
;
3274 if (nr
!= f_pos
) /* 32bit overflow? */
3278 task
= pid_task(pid
, PIDTYPE_PID
);
3282 /* Attempt to start with the tid of a thread */
3284 pos
= find_task_by_pid_ns(tid
, ns
);
3285 if (pos
&& same_thread_group(pos
, task
))
3289 /* If nr exceeds the number of threads there is nothing todo */
3290 if (nr
>= get_nr_threads(task
))
3293 /* If we haven't found our starting place yet start
3294 * with the leader and walk nr threads forward.
3296 pos
= task
= task
->group_leader
;
3300 } while_each_thread(task
, pos
);
3305 get_task_struct(pos
);
3312 * Find the next thread in the thread list.
3313 * Return NULL if there is an error or no next thread.
3315 * The reference to the input task_struct is released.
3317 static struct task_struct
*next_tid(struct task_struct
*start
)
3319 struct task_struct
*pos
= NULL
;
3321 if (pid_alive(start
)) {
3322 pos
= next_thread(start
);
3323 if (thread_group_leader(pos
))
3326 get_task_struct(pos
);
3329 put_task_struct(start
);
3333 /* for the /proc/TGID/task/ directories */
3334 static int proc_task_readdir(struct file
*file
, struct dir_context
*ctx
)
3336 struct inode
*inode
= file_inode(file
);
3337 struct task_struct
*task
;
3338 struct pid_namespace
*ns
;
3341 if (proc_inode_is_dead(inode
))
3344 if (!dir_emit_dots(file
, ctx
))
3347 /* f_version caches the tgid value that the last readdir call couldn't
3348 * return. lseek aka telldir automagically resets f_version to 0.
3350 ns
= inode
->i_sb
->s_fs_info
;
3351 tid
= (int)file
->f_version
;
3352 file
->f_version
= 0;
3353 for (task
= first_tid(proc_pid(inode
), tid
, ctx
->pos
- 2, ns
);
3355 task
= next_tid(task
), ctx
->pos
++) {
3356 char name
[PROC_NUMBUF
];
3358 tid
= task_pid_nr_ns(task
, ns
);
3359 len
= snprintf(name
, sizeof(name
), "%d", tid
);
3360 if (!proc_fill_cache(file
, ctx
, name
, len
,
3361 proc_task_instantiate
, task
, NULL
)) {
3362 /* returning this tgid failed, save it as the first
3363 * pid for the next readir call */
3364 file
->f_version
= (u64
)tid
;
3365 put_task_struct(task
);
3373 static int proc_task_getattr(struct vfsmount
*mnt
, struct dentry
*dentry
, struct kstat
*stat
)
3375 struct inode
*inode
= d_inode(dentry
);
3376 struct task_struct
*p
= get_proc_task(inode
);
3377 generic_fillattr(inode
, stat
);
3380 stat
->nlink
+= get_nr_threads(p
);
3387 static const struct inode_operations proc_task_inode_operations
= {
3388 .lookup
= proc_task_lookup
,
3389 .getattr
= proc_task_getattr
,
3390 .setattr
= proc_setattr
,
3391 .permission
= proc_pid_permission
,
3394 static const struct file_operations proc_task_operations
= {
3395 .read
= generic_read_dir
,
3396 .iterate
= proc_task_readdir
,
3397 .llseek
= default_llseek
,