1 // SPDX-License-Identifier: GPL-2.0
5 * Copyright (C) 1991, 1992 Linus Torvalds
7 * proc base directory handling functions
9 * 1999, Al Viro. Rewritten. Now it covers the whole per-process part.
10 * Instead of using magical inumbers to determine the kind of object
11 * we allocate and fill in-core inodes upon lookup. They don't even
12 * go into icache. We cache the reference to task_struct upon lookup too.
13 * Eventually it should become a filesystem in its own. We don't use the
14 * rest of procfs anymore.
20 * Bruna Moreira <bruna.moreira@indt.org.br>
21 * Edjard Mota <edjard.mota@indt.org.br>
22 * Ilias Biris <ilias.biris@indt.org.br>
23 * Mauricio Lin <mauricio.lin@indt.org.br>
25 * Embedded Linux Lab - 10LE Instituto Nokia de Tecnologia - INdT
27 * A new process specific entry (smaps) included in /proc. It shows the
28 * size of rss for each memory area. The maps entry lacks information
29 * about physical memory size (rss) for each mapped file, i.e.,
30 * rss information for executables and library files.
31 * This additional information is useful for any tools that need to know
32 * about physical memory consumption for a process specific library.
36 * Embedded Linux Lab - 10LE Instituto Nokia de Tecnologia - INdT
37 * Pud inclusion in the page table walking.
41 * 10LE Instituto Nokia de Tecnologia - INdT:
42 * A better way to walks through the page table as suggested by Hugh Dickins.
44 * Simo Piiroinen <simo.piiroinen@nokia.com>:
45 * Smaps information related to shared, private, clean and dirty pages.
47 * Paul Mundt <paul.mundt@nokia.com>:
48 * Overall revision about smaps.
51 #include <linux/uaccess.h>
53 #include <linux/errno.h>
54 #include <linux/time.h>
55 #include <linux/proc_fs.h>
56 #include <linux/stat.h>
57 #include <linux/task_io_accounting_ops.h>
58 #include <linux/init.h>
59 #include <linux/capability.h>
60 #include <linux/file.h>
61 #include <linux/fdtable.h>
62 #include <linux/string.h>
63 #include <linux/seq_file.h>
64 #include <linux/namei.h>
65 #include <linux/mnt_namespace.h>
67 #include <linux/swap.h>
68 #include <linux/rcupdate.h>
69 #include <linux/kallsyms.h>
70 #include <linux/stacktrace.h>
71 #include <linux/resource.h>
72 #include <linux/module.h>
73 #include <linux/mount.h>
74 #include <linux/security.h>
75 #include <linux/ptrace.h>
76 #include <linux/tracehook.h>
77 #include <linux/printk.h>
78 #include <linux/cache.h>
79 #include <linux/cgroup.h>
80 #include <linux/cpuset.h>
81 #include <linux/audit.h>
82 #include <linux/poll.h>
83 #include <linux/nsproxy.h>
84 #include <linux/oom.h>
85 #include <linux/elf.h>
86 #include <linux/pid_namespace.h>
87 #include <linux/user_namespace.h>
88 #include <linux/fs_struct.h>
89 #include <linux/slab.h>
90 #include <linux/sched/autogroup.h>
91 #include <linux/sched/mm.h>
92 #include <linux/sched/coredump.h>
93 #include <linux/sched/debug.h>
94 #include <linux/sched/stat.h>
95 #include <linux/flex_array.h>
96 #include <linux/posix-timers.h>
97 #include <trace/events/oom.h>
101 #include "../../lib/kstrtox.h"
104 * Implementing inode permission operations in /proc is almost
105 * certainly an error. Permission checks need to happen during
106 * each system call not at open time. The reason is that most of
107 * what we wish to check for permissions in /proc varies at runtime.
109 * The classic example of a problem is opening file descriptors
110 * in /proc for a task before it execs a suid executable.
113 static u8 nlink_tid __ro_after_init
;
114 static u8 nlink_tgid __ro_after_init
;
120 const struct inode_operations
*iop
;
121 const struct file_operations
*fop
;
125 #define NOD(NAME, MODE, IOP, FOP, OP) { \
127 .len = sizeof(NAME) - 1, \
134 #define DIR(NAME, MODE, iops, fops) \
135 NOD(NAME, (S_IFDIR|(MODE)), &iops, &fops, {} )
136 #define LNK(NAME, get_link) \
137 NOD(NAME, (S_IFLNK|S_IRWXUGO), \
138 &proc_pid_link_inode_operations, NULL, \
139 { .proc_get_link = get_link } )
140 #define REG(NAME, MODE, fops) \
141 NOD(NAME, (S_IFREG|(MODE)), NULL, &fops, {})
142 #define ONE(NAME, MODE, show) \
143 NOD(NAME, (S_IFREG|(MODE)), \
144 NULL, &proc_single_file_operations, \
145 { .proc_show = show } )
148 * Count the number of hardlinks for the pid_entry table, excluding the .
151 static unsigned int __init
pid_entry_nlink(const struct pid_entry
*entries
,
158 for (i
= 0; i
< n
; ++i
) {
159 if (S_ISDIR(entries
[i
].mode
))
166 static int get_task_root(struct task_struct
*task
, struct path
*root
)
168 int result
= -ENOENT
;
172 get_fs_root(task
->fs
, root
);
179 static int proc_cwd_link(struct dentry
*dentry
, struct path
*path
)
181 struct task_struct
*task
= get_proc_task(d_inode(dentry
));
182 int result
= -ENOENT
;
187 get_fs_pwd(task
->fs
, path
);
191 put_task_struct(task
);
196 static int proc_root_link(struct dentry
*dentry
, struct path
*path
)
198 struct task_struct
*task
= get_proc_task(d_inode(dentry
));
199 int result
= -ENOENT
;
202 result
= get_task_root(task
, path
);
203 put_task_struct(task
);
208 static ssize_t
get_mm_cmdline(struct mm_struct
*mm
, char __user
*buf
,
209 size_t count
, loff_t
*ppos
)
211 unsigned long arg_start
, arg_end
, env_start
, env_end
;
212 unsigned long pos
, len
;
215 /* Check if process spawned far enough to have cmdline. */
219 spin_lock(&mm
->arg_lock
);
220 arg_start
= mm
->arg_start
;
221 arg_end
= mm
->arg_end
;
222 env_start
= mm
->env_start
;
223 env_end
= mm
->env_end
;
224 spin_unlock(&mm
->arg_lock
);
226 if (arg_start
>= arg_end
)
230 * We have traditionally allowed the user to re-write
231 * the argument strings and overflow the end result
232 * into the environment section. But only do that if
233 * the environment area is contiguous to the arguments.
235 if (env_start
!= arg_end
|| env_start
>= env_end
)
236 env_start
= env_end
= arg_end
;
238 /* .. and limit it to a maximum of one page of slop */
239 if (env_end
>= arg_end
+ PAGE_SIZE
)
240 env_end
= arg_end
+ PAGE_SIZE
- 1;
242 /* We're not going to care if "*ppos" has high bits set */
243 pos
= arg_start
+ *ppos
;
245 /* .. but we do check the result is in the proper range */
246 if (pos
< arg_start
|| pos
>= env_end
)
249 /* .. and we never go past env_end */
250 if (env_end
- pos
< count
)
251 count
= env_end
- pos
;
253 page
= (char *)__get_free_page(GFP_KERNEL
);
260 size_t size
= min_t(size_t, PAGE_SIZE
, count
);
264 * Are we already starting past the official end?
265 * We always include the last byte that is *supposed*
268 offset
= (pos
>= arg_end
) ? pos
- arg_end
+ 1 : 0;
270 got
= access_remote_vm(mm
, pos
- offset
, page
, size
+ offset
, FOLL_ANON
);
275 /* Don't walk past a NUL character once you hit arg_end */
276 if (pos
+ got
>= arg_end
) {
280 * If we started before 'arg_end' but ended up
281 * at or after it, we start the NUL character
282 * check at arg_end-1 (where we expect the normal
285 * NOTE! This is smaller than 'got', because
286 * pos + got >= arg_end
289 n
= arg_end
- pos
- 1;
291 /* Cut off at first NUL after 'n' */
292 got
= n
+ strnlen(page
+n
, offset
+got
-n
);
297 /* Include the NUL if it existed */
302 got
-= copy_to_user(buf
, page
+offset
, got
);
303 if (unlikely(!got
)) {
314 free_page((unsigned long)page
);
318 static ssize_t
get_task_cmdline(struct task_struct
*tsk
, char __user
*buf
,
319 size_t count
, loff_t
*pos
)
321 struct mm_struct
*mm
;
324 mm
= get_task_mm(tsk
);
328 ret
= get_mm_cmdline(mm
, buf
, count
, pos
);
333 static ssize_t
proc_pid_cmdline_read(struct file
*file
, char __user
*buf
,
334 size_t count
, loff_t
*pos
)
336 struct task_struct
*tsk
;
341 tsk
= get_proc_task(file_inode(file
));
344 ret
= get_task_cmdline(tsk
, buf
, count
, pos
);
345 put_task_struct(tsk
);
351 static const struct file_operations proc_pid_cmdline_ops
= {
352 .read
= proc_pid_cmdline_read
,
353 .llseek
= generic_file_llseek
,
356 #ifdef CONFIG_KALLSYMS
358 * Provides a wchan file via kallsyms in a proper one-value-per-file format.
359 * Returns the resolved symbol. If that fails, simply return the address.
361 static int proc_pid_wchan(struct seq_file
*m
, struct pid_namespace
*ns
,
362 struct pid
*pid
, struct task_struct
*task
)
365 char symname
[KSYM_NAME_LEN
];
367 if (!ptrace_may_access(task
, PTRACE_MODE_READ_FSCREDS
))
370 wchan
= get_wchan(task
);
371 if (wchan
&& !lookup_symbol_name(wchan
, symname
)) {
372 seq_puts(m
, symname
);
380 #endif /* CONFIG_KALLSYMS */
382 static int lock_trace(struct task_struct
*task
)
384 int err
= mutex_lock_killable(&task
->signal
->cred_guard_mutex
);
387 if (!ptrace_may_access(task
, PTRACE_MODE_ATTACH_FSCREDS
)) {
388 mutex_unlock(&task
->signal
->cred_guard_mutex
);
394 static void unlock_trace(struct task_struct
*task
)
396 mutex_unlock(&task
->signal
->cred_guard_mutex
);
399 #ifdef CONFIG_STACKTRACE
401 #define MAX_STACK_TRACE_DEPTH 64
403 static int proc_pid_stack(struct seq_file
*m
, struct pid_namespace
*ns
,
404 struct pid
*pid
, struct task_struct
*task
)
406 struct stack_trace trace
;
407 unsigned long *entries
;
411 * The ability to racily run the kernel stack unwinder on a running task
412 * and then observe the unwinder output is scary; while it is useful for
413 * debugging kernel issues, it can also allow an attacker to leak kernel
415 * Doing this in a manner that is at least safe from races would require
416 * some work to ensure that the remote task can not be scheduled; and
417 * even then, this would still expose the unwinder as local attack
419 * Therefore, this interface is restricted to root.
421 if (!file_ns_capable(m
->file
, &init_user_ns
, CAP_SYS_ADMIN
))
424 entries
= kmalloc_array(MAX_STACK_TRACE_DEPTH
, sizeof(*entries
),
429 trace
.nr_entries
= 0;
430 trace
.max_entries
= MAX_STACK_TRACE_DEPTH
;
431 trace
.entries
= entries
;
434 err
= lock_trace(task
);
438 save_stack_trace_tsk(task
, &trace
);
440 for (i
= 0; i
< trace
.nr_entries
; i
++) {
441 seq_printf(m
, "[<0>] %pB\n", (void *)entries
[i
]);
451 #ifdef CONFIG_SCHED_INFO
453 * Provides /proc/PID/schedstat
455 static int proc_pid_schedstat(struct seq_file
*m
, struct pid_namespace
*ns
,
456 struct pid
*pid
, struct task_struct
*task
)
458 if (unlikely(!sched_info_on()))
459 seq_printf(m
, "0 0 0\n");
461 seq_printf(m
, "%llu %llu %lu\n",
462 (unsigned long long)task
->se
.sum_exec_runtime
,
463 (unsigned long long)task
->sched_info
.run_delay
,
464 task
->sched_info
.pcount
);
470 #ifdef CONFIG_LATENCYTOP
471 static int lstats_show_proc(struct seq_file
*m
, void *v
)
474 struct inode
*inode
= m
->private;
475 struct task_struct
*task
= get_proc_task(inode
);
479 seq_puts(m
, "Latency Top version : v0.1\n");
480 for (i
= 0; i
< LT_SAVECOUNT
; i
++) {
481 struct latency_record
*lr
= &task
->latency_record
[i
];
482 if (lr
->backtrace
[0]) {
484 seq_printf(m
, "%i %li %li",
485 lr
->count
, lr
->time
, lr
->max
);
486 for (q
= 0; q
< LT_BACKTRACEDEPTH
; q
++) {
487 unsigned long bt
= lr
->backtrace
[q
];
492 seq_printf(m
, " %ps", (void *)bt
);
498 put_task_struct(task
);
502 static int lstats_open(struct inode
*inode
, struct file
*file
)
504 return single_open(file
, lstats_show_proc
, inode
);
507 static ssize_t
lstats_write(struct file
*file
, const char __user
*buf
,
508 size_t count
, loff_t
*offs
)
510 struct task_struct
*task
= get_proc_task(file_inode(file
));
514 clear_all_latency_tracing(task
);
515 put_task_struct(task
);
520 static const struct file_operations proc_lstats_operations
= {
523 .write
= lstats_write
,
525 .release
= single_release
,
530 static int proc_oom_score(struct seq_file
*m
, struct pid_namespace
*ns
,
531 struct pid
*pid
, struct task_struct
*task
)
533 unsigned long totalpages
= totalram_pages
+ total_swap_pages
;
534 unsigned long points
= 0;
536 points
= oom_badness(task
, NULL
, NULL
, totalpages
) *
538 seq_printf(m
, "%lu\n", points
);
548 static const struct limit_names lnames
[RLIM_NLIMITS
] = {
549 [RLIMIT_CPU
] = {"Max cpu time", "seconds"},
550 [RLIMIT_FSIZE
] = {"Max file size", "bytes"},
551 [RLIMIT_DATA
] = {"Max data size", "bytes"},
552 [RLIMIT_STACK
] = {"Max stack size", "bytes"},
553 [RLIMIT_CORE
] = {"Max core file size", "bytes"},
554 [RLIMIT_RSS
] = {"Max resident set", "bytes"},
555 [RLIMIT_NPROC
] = {"Max processes", "processes"},
556 [RLIMIT_NOFILE
] = {"Max open files", "files"},
557 [RLIMIT_MEMLOCK
] = {"Max locked memory", "bytes"},
558 [RLIMIT_AS
] = {"Max address space", "bytes"},
559 [RLIMIT_LOCKS
] = {"Max file locks", "locks"},
560 [RLIMIT_SIGPENDING
] = {"Max pending signals", "signals"},
561 [RLIMIT_MSGQUEUE
] = {"Max msgqueue size", "bytes"},
562 [RLIMIT_NICE
] = {"Max nice priority", NULL
},
563 [RLIMIT_RTPRIO
] = {"Max realtime priority", NULL
},
564 [RLIMIT_RTTIME
] = {"Max realtime timeout", "us"},
567 /* Display limits for a process */
568 static int proc_pid_limits(struct seq_file
*m
, struct pid_namespace
*ns
,
569 struct pid
*pid
, struct task_struct
*task
)
574 struct rlimit rlim
[RLIM_NLIMITS
];
576 if (!lock_task_sighand(task
, &flags
))
578 memcpy(rlim
, task
->signal
->rlim
, sizeof(struct rlimit
) * RLIM_NLIMITS
);
579 unlock_task_sighand(task
, &flags
);
582 * print the file header
584 seq_printf(m
, "%-25s %-20s %-20s %-10s\n",
585 "Limit", "Soft Limit", "Hard Limit", "Units");
587 for (i
= 0; i
< RLIM_NLIMITS
; i
++) {
588 if (rlim
[i
].rlim_cur
== RLIM_INFINITY
)
589 seq_printf(m
, "%-25s %-20s ",
590 lnames
[i
].name
, "unlimited");
592 seq_printf(m
, "%-25s %-20lu ",
593 lnames
[i
].name
, rlim
[i
].rlim_cur
);
595 if (rlim
[i
].rlim_max
== RLIM_INFINITY
)
596 seq_printf(m
, "%-20s ", "unlimited");
598 seq_printf(m
, "%-20lu ", rlim
[i
].rlim_max
);
601 seq_printf(m
, "%-10s\n", lnames
[i
].unit
);
609 #ifdef CONFIG_HAVE_ARCH_TRACEHOOK
610 static int proc_pid_syscall(struct seq_file
*m
, struct pid_namespace
*ns
,
611 struct pid
*pid
, struct task_struct
*task
)
614 unsigned long args
[6], sp
, pc
;
617 res
= lock_trace(task
);
621 if (task_current_syscall(task
, &nr
, args
, 6, &sp
, &pc
))
622 seq_puts(m
, "running\n");
624 seq_printf(m
, "%ld 0x%lx 0x%lx\n", nr
, sp
, pc
);
627 "%ld 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx\n",
629 args
[0], args
[1], args
[2], args
[3], args
[4], args
[5],
635 #endif /* CONFIG_HAVE_ARCH_TRACEHOOK */
637 /************************************************************************/
638 /* Here the fs part begins */
639 /************************************************************************/
641 /* permission checks */
642 static int proc_fd_access_allowed(struct inode
*inode
)
644 struct task_struct
*task
;
646 /* Allow access to a task's file descriptors if it is us or we
647 * may use ptrace attach to the process and find out that
650 task
= get_proc_task(inode
);
652 allowed
= ptrace_may_access(task
, PTRACE_MODE_READ_FSCREDS
);
653 put_task_struct(task
);
658 int proc_setattr(struct dentry
*dentry
, struct iattr
*attr
)
661 struct inode
*inode
= d_inode(dentry
);
663 if (attr
->ia_valid
& ATTR_MODE
)
666 error
= setattr_prepare(dentry
, attr
);
670 setattr_copy(inode
, attr
);
671 mark_inode_dirty(inode
);
676 * May current process learn task's sched/cmdline info (for hide_pid_min=1)
677 * or euid/egid (for hide_pid_min=2)?
679 static bool has_pid_permissions(struct pid_namespace
*pid
,
680 struct task_struct
*task
,
683 if (pid
->hide_pid
< hide_pid_min
)
685 if (in_group_p(pid
->pid_gid
))
687 return ptrace_may_access(task
, PTRACE_MODE_READ_FSCREDS
);
691 static int proc_pid_permission(struct inode
*inode
, int mask
)
693 struct pid_namespace
*pid
= proc_pid_ns(inode
);
694 struct task_struct
*task
;
697 task
= get_proc_task(inode
);
700 has_perms
= has_pid_permissions(pid
, task
, HIDEPID_NO_ACCESS
);
701 put_task_struct(task
);
704 if (pid
->hide_pid
== HIDEPID_INVISIBLE
) {
706 * Let's make getdents(), stat(), and open()
707 * consistent with each other. If a process
708 * may not stat() a file, it shouldn't be seen
716 return generic_permission(inode
, mask
);
721 static const struct inode_operations proc_def_inode_operations
= {
722 .setattr
= proc_setattr
,
725 static int proc_single_show(struct seq_file
*m
, void *v
)
727 struct inode
*inode
= m
->private;
728 struct pid_namespace
*ns
= proc_pid_ns(inode
);
729 struct pid
*pid
= proc_pid(inode
);
730 struct task_struct
*task
;
733 task
= get_pid_task(pid
, PIDTYPE_PID
);
737 ret
= PROC_I(inode
)->op
.proc_show(m
, ns
, pid
, task
);
739 put_task_struct(task
);
743 static int proc_single_open(struct inode
*inode
, struct file
*filp
)
745 return single_open(filp
, proc_single_show
, inode
);
748 static const struct file_operations proc_single_file_operations
= {
749 .open
= proc_single_open
,
752 .release
= single_release
,
756 struct mm_struct
*proc_mem_open(struct inode
*inode
, unsigned int mode
)
758 struct task_struct
*task
= get_proc_task(inode
);
759 struct mm_struct
*mm
= ERR_PTR(-ESRCH
);
762 mm
= mm_access(task
, mode
| PTRACE_MODE_FSCREDS
);
763 put_task_struct(task
);
765 if (!IS_ERR_OR_NULL(mm
)) {
766 /* ensure this mm_struct can't be freed */
768 /* but do not pin its memory */
776 static int __mem_open(struct inode
*inode
, struct file
*file
, unsigned int mode
)
778 struct mm_struct
*mm
= proc_mem_open(inode
, mode
);
783 file
->private_data
= mm
;
787 static int mem_open(struct inode
*inode
, struct file
*file
)
789 int ret
= __mem_open(inode
, file
, PTRACE_MODE_ATTACH
);
791 /* OK to pass negative loff_t, we can catch out-of-range */
792 file
->f_mode
|= FMODE_UNSIGNED_OFFSET
;
797 static ssize_t
mem_rw(struct file
*file
, char __user
*buf
,
798 size_t count
, loff_t
*ppos
, int write
)
800 struct mm_struct
*mm
= file
->private_data
;
801 unsigned long addr
= *ppos
;
809 page
= (char *)__get_free_page(GFP_KERNEL
);
814 if (!mmget_not_zero(mm
))
817 flags
= FOLL_FORCE
| (write
? FOLL_WRITE
: 0);
820 int this_len
= min_t(int, count
, PAGE_SIZE
);
822 if (write
&& copy_from_user(page
, buf
, this_len
)) {
827 this_len
= access_remote_vm(mm
, addr
, page
, this_len
, flags
);
834 if (!write
&& copy_to_user(buf
, page
, this_len
)) {
848 free_page((unsigned long) page
);
852 static ssize_t
mem_read(struct file
*file
, char __user
*buf
,
853 size_t count
, loff_t
*ppos
)
855 return mem_rw(file
, buf
, count
, ppos
, 0);
858 static ssize_t
mem_write(struct file
*file
, const char __user
*buf
,
859 size_t count
, loff_t
*ppos
)
861 return mem_rw(file
, (char __user
*)buf
, count
, ppos
, 1);
864 loff_t
mem_lseek(struct file
*file
, loff_t offset
, int orig
)
868 file
->f_pos
= offset
;
871 file
->f_pos
+= offset
;
876 force_successful_syscall_return();
880 static int mem_release(struct inode
*inode
, struct file
*file
)
882 struct mm_struct
*mm
= file
->private_data
;
888 static const struct file_operations proc_mem_operations
= {
893 .release
= mem_release
,
896 static int environ_open(struct inode
*inode
, struct file
*file
)
898 return __mem_open(inode
, file
, PTRACE_MODE_READ
);
901 static ssize_t
environ_read(struct file
*file
, char __user
*buf
,
902 size_t count
, loff_t
*ppos
)
905 unsigned long src
= *ppos
;
907 struct mm_struct
*mm
= file
->private_data
;
908 unsigned long env_start
, env_end
;
910 /* Ensure the process spawned far enough to have an environment. */
911 if (!mm
|| !mm
->env_end
)
914 page
= (char *)__get_free_page(GFP_KERNEL
);
919 if (!mmget_not_zero(mm
))
922 spin_lock(&mm
->arg_lock
);
923 env_start
= mm
->env_start
;
924 env_end
= mm
->env_end
;
925 spin_unlock(&mm
->arg_lock
);
928 size_t this_len
, max_len
;
931 if (src
>= (env_end
- env_start
))
934 this_len
= env_end
- (env_start
+ src
);
936 max_len
= min_t(size_t, PAGE_SIZE
, count
);
937 this_len
= min(max_len
, this_len
);
939 retval
= access_remote_vm(mm
, (env_start
+ src
), page
, this_len
, FOLL_ANON
);
946 if (copy_to_user(buf
, page
, retval
)) {
960 free_page((unsigned long) page
);
964 static const struct file_operations proc_environ_operations
= {
965 .open
= environ_open
,
966 .read
= environ_read
,
967 .llseek
= generic_file_llseek
,
968 .release
= mem_release
,
971 static int auxv_open(struct inode
*inode
, struct file
*file
)
973 return __mem_open(inode
, file
, PTRACE_MODE_READ_FSCREDS
);
976 static ssize_t
auxv_read(struct file
*file
, char __user
*buf
,
977 size_t count
, loff_t
*ppos
)
979 struct mm_struct
*mm
= file
->private_data
;
980 unsigned int nwords
= 0;
986 } while (mm
->saved_auxv
[nwords
- 2] != 0); /* AT_NULL */
987 return simple_read_from_buffer(buf
, count
, ppos
, mm
->saved_auxv
,
988 nwords
* sizeof(mm
->saved_auxv
[0]));
991 static const struct file_operations proc_auxv_operations
= {
994 .llseek
= generic_file_llseek
,
995 .release
= mem_release
,
998 static ssize_t
oom_adj_read(struct file
*file
, char __user
*buf
, size_t count
,
1001 struct task_struct
*task
= get_proc_task(file_inode(file
));
1002 char buffer
[PROC_NUMBUF
];
1003 int oom_adj
= OOM_ADJUST_MIN
;
1008 if (task
->signal
->oom_score_adj
== OOM_SCORE_ADJ_MAX
)
1009 oom_adj
= OOM_ADJUST_MAX
;
1011 oom_adj
= (task
->signal
->oom_score_adj
* -OOM_DISABLE
) /
1013 put_task_struct(task
);
1014 len
= snprintf(buffer
, sizeof(buffer
), "%d\n", oom_adj
);
1015 return simple_read_from_buffer(buf
, count
, ppos
, buffer
, len
);
1018 static int __set_oom_adj(struct file
*file
, int oom_adj
, bool legacy
)
1020 static DEFINE_MUTEX(oom_adj_mutex
);
1021 struct mm_struct
*mm
= NULL
;
1022 struct task_struct
*task
;
1025 task
= get_proc_task(file_inode(file
));
1029 mutex_lock(&oom_adj_mutex
);
1031 if (oom_adj
< task
->signal
->oom_score_adj
&&
1032 !capable(CAP_SYS_RESOURCE
)) {
1037 * /proc/pid/oom_adj is provided for legacy purposes, ask users to use
1038 * /proc/pid/oom_score_adj instead.
1040 pr_warn_once("%s (%d): /proc/%d/oom_adj is deprecated, please use /proc/%d/oom_score_adj instead.\n",
1041 current
->comm
, task_pid_nr(current
), task_pid_nr(task
),
1044 if ((short)oom_adj
< task
->signal
->oom_score_adj_min
&&
1045 !capable(CAP_SYS_RESOURCE
)) {
1052 * Make sure we will check other processes sharing the mm if this is
1053 * not vfrok which wants its own oom_score_adj.
1054 * pin the mm so it doesn't go away and get reused after task_unlock
1056 if (!task
->vfork_done
) {
1057 struct task_struct
*p
= find_lock_task_mm(task
);
1060 if (atomic_read(&p
->mm
->mm_users
) > 1) {
1068 task
->signal
->oom_score_adj
= oom_adj
;
1069 if (!legacy
&& has_capability_noaudit(current
, CAP_SYS_RESOURCE
))
1070 task
->signal
->oom_score_adj_min
= (short)oom_adj
;
1071 trace_oom_score_adj_update(task
);
1074 struct task_struct
*p
;
1077 for_each_process(p
) {
1078 if (same_thread_group(task
, p
))
1081 /* do not touch kernel threads or the global init */
1082 if (p
->flags
& PF_KTHREAD
|| is_global_init(p
))
1086 if (!p
->vfork_done
&& process_shares_mm(p
, mm
)) {
1087 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",
1088 task_pid_nr(p
), p
->comm
,
1089 p
->signal
->oom_score_adj
, oom_adj
,
1090 task_pid_nr(task
), task
->comm
);
1091 p
->signal
->oom_score_adj
= oom_adj
;
1092 if (!legacy
&& has_capability_noaudit(current
, CAP_SYS_RESOURCE
))
1093 p
->signal
->oom_score_adj_min
= (short)oom_adj
;
1101 mutex_unlock(&oom_adj_mutex
);
1102 put_task_struct(task
);
1107 * /proc/pid/oom_adj exists solely for backwards compatibility with previous
1108 * kernels. The effective policy is defined by oom_score_adj, which has a
1109 * different scale: oom_adj grew exponentially and oom_score_adj grows linearly.
1110 * Values written to oom_adj are simply mapped linearly to oom_score_adj.
1111 * Processes that become oom disabled via oom_adj will still be oom disabled
1112 * with this implementation.
1114 * oom_adj cannot be removed since existing userspace binaries use it.
1116 static ssize_t
oom_adj_write(struct file
*file
, const char __user
*buf
,
1117 size_t count
, loff_t
*ppos
)
1119 char buffer
[PROC_NUMBUF
];
1123 memset(buffer
, 0, sizeof(buffer
));
1124 if (count
> sizeof(buffer
) - 1)
1125 count
= sizeof(buffer
) - 1;
1126 if (copy_from_user(buffer
, buf
, count
)) {
1131 err
= kstrtoint(strstrip(buffer
), 0, &oom_adj
);
1134 if ((oom_adj
< OOM_ADJUST_MIN
|| oom_adj
> OOM_ADJUST_MAX
) &&
1135 oom_adj
!= OOM_DISABLE
) {
1141 * Scale /proc/pid/oom_score_adj appropriately ensuring that a maximum
1142 * value is always attainable.
1144 if (oom_adj
== OOM_ADJUST_MAX
)
1145 oom_adj
= OOM_SCORE_ADJ_MAX
;
1147 oom_adj
= (oom_adj
* OOM_SCORE_ADJ_MAX
) / -OOM_DISABLE
;
1149 err
= __set_oom_adj(file
, oom_adj
, true);
1151 return err
< 0 ? err
: count
;
1154 static const struct file_operations proc_oom_adj_operations
= {
1155 .read
= oom_adj_read
,
1156 .write
= oom_adj_write
,
1157 .llseek
= generic_file_llseek
,
1160 static ssize_t
oom_score_adj_read(struct file
*file
, char __user
*buf
,
1161 size_t count
, loff_t
*ppos
)
1163 struct task_struct
*task
= get_proc_task(file_inode(file
));
1164 char buffer
[PROC_NUMBUF
];
1165 short oom_score_adj
= OOM_SCORE_ADJ_MIN
;
1170 oom_score_adj
= task
->signal
->oom_score_adj
;
1171 put_task_struct(task
);
1172 len
= snprintf(buffer
, sizeof(buffer
), "%hd\n", oom_score_adj
);
1173 return simple_read_from_buffer(buf
, count
, ppos
, buffer
, len
);
1176 static ssize_t
oom_score_adj_write(struct file
*file
, const char __user
*buf
,
1177 size_t count
, loff_t
*ppos
)
1179 char buffer
[PROC_NUMBUF
];
1183 memset(buffer
, 0, sizeof(buffer
));
1184 if (count
> sizeof(buffer
) - 1)
1185 count
= sizeof(buffer
) - 1;
1186 if (copy_from_user(buffer
, buf
, count
)) {
1191 err
= kstrtoint(strstrip(buffer
), 0, &oom_score_adj
);
1194 if (oom_score_adj
< OOM_SCORE_ADJ_MIN
||
1195 oom_score_adj
> OOM_SCORE_ADJ_MAX
) {
1200 err
= __set_oom_adj(file
, oom_score_adj
, false);
1202 return err
< 0 ? err
: count
;
1205 static const struct file_operations proc_oom_score_adj_operations
= {
1206 .read
= oom_score_adj_read
,
1207 .write
= oom_score_adj_write
,
1208 .llseek
= default_llseek
,
1211 #ifdef CONFIG_AUDITSYSCALL
1212 #define TMPBUFLEN 11
1213 static ssize_t
proc_loginuid_read(struct file
* file
, char __user
* buf
,
1214 size_t count
, loff_t
*ppos
)
1216 struct inode
* inode
= file_inode(file
);
1217 struct task_struct
*task
= get_proc_task(inode
);
1219 char tmpbuf
[TMPBUFLEN
];
1223 length
= scnprintf(tmpbuf
, TMPBUFLEN
, "%u",
1224 from_kuid(file
->f_cred
->user_ns
,
1225 audit_get_loginuid(task
)));
1226 put_task_struct(task
);
1227 return simple_read_from_buffer(buf
, count
, ppos
, tmpbuf
, length
);
1230 static ssize_t
proc_loginuid_write(struct file
* file
, const char __user
* buf
,
1231 size_t count
, loff_t
*ppos
)
1233 struct inode
* inode
= file_inode(file
);
1239 if (current
!= pid_task(proc_pid(inode
), PIDTYPE_PID
)) {
1246 /* No partial writes. */
1250 rv
= kstrtou32_from_user(buf
, count
, 10, &loginuid
);
1254 /* is userspace tring to explicitly UNSET the loginuid? */
1255 if (loginuid
== AUDIT_UID_UNSET
) {
1256 kloginuid
= INVALID_UID
;
1258 kloginuid
= make_kuid(file
->f_cred
->user_ns
, loginuid
);
1259 if (!uid_valid(kloginuid
))
1263 rv
= audit_set_loginuid(kloginuid
);
1269 static const struct file_operations proc_loginuid_operations
= {
1270 .read
= proc_loginuid_read
,
1271 .write
= proc_loginuid_write
,
1272 .llseek
= generic_file_llseek
,
1275 static ssize_t
proc_sessionid_read(struct file
* file
, char __user
* buf
,
1276 size_t count
, loff_t
*ppos
)
1278 struct inode
* inode
= file_inode(file
);
1279 struct task_struct
*task
= get_proc_task(inode
);
1281 char tmpbuf
[TMPBUFLEN
];
1285 length
= scnprintf(tmpbuf
, TMPBUFLEN
, "%u",
1286 audit_get_sessionid(task
));
1287 put_task_struct(task
);
1288 return simple_read_from_buffer(buf
, count
, ppos
, tmpbuf
, length
);
1291 static const struct file_operations proc_sessionid_operations
= {
1292 .read
= proc_sessionid_read
,
1293 .llseek
= generic_file_llseek
,
1297 #ifdef CONFIG_FAULT_INJECTION
1298 static ssize_t
proc_fault_inject_read(struct file
* file
, char __user
* buf
,
1299 size_t count
, loff_t
*ppos
)
1301 struct task_struct
*task
= get_proc_task(file_inode(file
));
1302 char buffer
[PROC_NUMBUF
];
1308 make_it_fail
= task
->make_it_fail
;
1309 put_task_struct(task
);
1311 len
= snprintf(buffer
, sizeof(buffer
), "%i\n", make_it_fail
);
1313 return simple_read_from_buffer(buf
, count
, ppos
, buffer
, len
);
1316 static ssize_t
proc_fault_inject_write(struct file
* file
,
1317 const char __user
* buf
, size_t count
, loff_t
*ppos
)
1319 struct task_struct
*task
;
1320 char buffer
[PROC_NUMBUF
];
1324 if (!capable(CAP_SYS_RESOURCE
))
1326 memset(buffer
, 0, sizeof(buffer
));
1327 if (count
> sizeof(buffer
) - 1)
1328 count
= sizeof(buffer
) - 1;
1329 if (copy_from_user(buffer
, buf
, count
))
1331 rv
= kstrtoint(strstrip(buffer
), 0, &make_it_fail
);
1334 if (make_it_fail
< 0 || make_it_fail
> 1)
1337 task
= get_proc_task(file_inode(file
));
1340 task
->make_it_fail
= make_it_fail
;
1341 put_task_struct(task
);
1346 static const struct file_operations proc_fault_inject_operations
= {
1347 .read
= proc_fault_inject_read
,
1348 .write
= proc_fault_inject_write
,
1349 .llseek
= generic_file_llseek
,
1352 static ssize_t
proc_fail_nth_write(struct file
*file
, const char __user
*buf
,
1353 size_t count
, loff_t
*ppos
)
1355 struct task_struct
*task
;
1359 err
= kstrtouint_from_user(buf
, count
, 0, &n
);
1363 task
= get_proc_task(file_inode(file
));
1367 put_task_struct(task
);
1372 static ssize_t
proc_fail_nth_read(struct file
*file
, char __user
*buf
,
1373 size_t count
, loff_t
*ppos
)
1375 struct task_struct
*task
;
1376 char numbuf
[PROC_NUMBUF
];
1379 task
= get_proc_task(file_inode(file
));
1382 len
= snprintf(numbuf
, sizeof(numbuf
), "%u\n", task
->fail_nth
);
1383 put_task_struct(task
);
1384 return simple_read_from_buffer(buf
, count
, ppos
, numbuf
, len
);
1387 static const struct file_operations proc_fail_nth_operations
= {
1388 .read
= proc_fail_nth_read
,
1389 .write
= proc_fail_nth_write
,
1394 #ifdef CONFIG_SCHED_DEBUG
1396 * Print out various scheduling related per-task fields:
1398 static int sched_show(struct seq_file
*m
, void *v
)
1400 struct inode
*inode
= m
->private;
1401 struct pid_namespace
*ns
= proc_pid_ns(inode
);
1402 struct task_struct
*p
;
1404 p
= get_proc_task(inode
);
1407 proc_sched_show_task(p
, ns
, m
);
1415 sched_write(struct file
*file
, const char __user
*buf
,
1416 size_t count
, loff_t
*offset
)
1418 struct inode
*inode
= file_inode(file
);
1419 struct task_struct
*p
;
1421 p
= get_proc_task(inode
);
1424 proc_sched_set_task(p
);
1431 static int sched_open(struct inode
*inode
, struct file
*filp
)
1433 return single_open(filp
, sched_show
, inode
);
1436 static const struct file_operations proc_pid_sched_operations
= {
1439 .write
= sched_write
,
1440 .llseek
= seq_lseek
,
1441 .release
= single_release
,
1446 #ifdef CONFIG_SCHED_AUTOGROUP
1448 * Print out autogroup related information:
1450 static int sched_autogroup_show(struct seq_file
*m
, void *v
)
1452 struct inode
*inode
= m
->private;
1453 struct task_struct
*p
;
1455 p
= get_proc_task(inode
);
1458 proc_sched_autogroup_show_task(p
, m
);
1466 sched_autogroup_write(struct file
*file
, const char __user
*buf
,
1467 size_t count
, loff_t
*offset
)
1469 struct inode
*inode
= file_inode(file
);
1470 struct task_struct
*p
;
1471 char buffer
[PROC_NUMBUF
];
1475 memset(buffer
, 0, sizeof(buffer
));
1476 if (count
> sizeof(buffer
) - 1)
1477 count
= sizeof(buffer
) - 1;
1478 if (copy_from_user(buffer
, buf
, count
))
1481 err
= kstrtoint(strstrip(buffer
), 0, &nice
);
1485 p
= get_proc_task(inode
);
1489 err
= proc_sched_autogroup_set_nice(p
, nice
);
1498 static int sched_autogroup_open(struct inode
*inode
, struct file
*filp
)
1502 ret
= single_open(filp
, sched_autogroup_show
, NULL
);
1504 struct seq_file
*m
= filp
->private_data
;
1511 static const struct file_operations proc_pid_sched_autogroup_operations
= {
1512 .open
= sched_autogroup_open
,
1514 .write
= sched_autogroup_write
,
1515 .llseek
= seq_lseek
,
1516 .release
= single_release
,
1519 #endif /* CONFIG_SCHED_AUTOGROUP */
1521 static ssize_t
comm_write(struct file
*file
, const char __user
*buf
,
1522 size_t count
, loff_t
*offset
)
1524 struct inode
*inode
= file_inode(file
);
1525 struct task_struct
*p
;
1526 char buffer
[TASK_COMM_LEN
];
1527 const size_t maxlen
= sizeof(buffer
) - 1;
1529 memset(buffer
, 0, sizeof(buffer
));
1530 if (copy_from_user(buffer
, buf
, count
> maxlen
? maxlen
: count
))
1533 p
= get_proc_task(inode
);
1537 if (same_thread_group(current
, p
))
1538 set_task_comm(p
, buffer
);
1547 static int comm_show(struct seq_file
*m
, void *v
)
1549 struct inode
*inode
= m
->private;
1550 struct task_struct
*p
;
1552 p
= get_proc_task(inode
);
1556 proc_task_name(m
, p
, false);
1564 static int comm_open(struct inode
*inode
, struct file
*filp
)
1566 return single_open(filp
, comm_show
, inode
);
1569 static const struct file_operations proc_pid_set_comm_operations
= {
1572 .write
= comm_write
,
1573 .llseek
= seq_lseek
,
1574 .release
= single_release
,
1577 static int proc_exe_link(struct dentry
*dentry
, struct path
*exe_path
)
1579 struct task_struct
*task
;
1580 struct file
*exe_file
;
1582 task
= get_proc_task(d_inode(dentry
));
1585 exe_file
= get_task_exe_file(task
);
1586 put_task_struct(task
);
1588 *exe_path
= exe_file
->f_path
;
1589 path_get(&exe_file
->f_path
);
1596 static const char *proc_pid_get_link(struct dentry
*dentry
,
1597 struct inode
*inode
,
1598 struct delayed_call
*done
)
1601 int error
= -EACCES
;
1604 return ERR_PTR(-ECHILD
);
1606 /* Are we allowed to snoop on the tasks file descriptors? */
1607 if (!proc_fd_access_allowed(inode
))
1610 error
= PROC_I(inode
)->op
.proc_get_link(dentry
, &path
);
1614 nd_jump_link(&path
);
1617 return ERR_PTR(error
);
1620 static int do_proc_readlink(struct path
*path
, char __user
*buffer
, int buflen
)
1622 char *tmp
= (char *)__get_free_page(GFP_KERNEL
);
1629 pathname
= d_path(path
, tmp
, PAGE_SIZE
);
1630 len
= PTR_ERR(pathname
);
1631 if (IS_ERR(pathname
))
1633 len
= tmp
+ PAGE_SIZE
- 1 - pathname
;
1637 if (copy_to_user(buffer
, pathname
, len
))
1640 free_page((unsigned long)tmp
);
1644 static int proc_pid_readlink(struct dentry
* dentry
, char __user
* buffer
, int buflen
)
1646 int error
= -EACCES
;
1647 struct inode
*inode
= d_inode(dentry
);
1650 /* Are we allowed to snoop on the tasks file descriptors? */
1651 if (!proc_fd_access_allowed(inode
))
1654 error
= PROC_I(inode
)->op
.proc_get_link(dentry
, &path
);
1658 error
= do_proc_readlink(&path
, buffer
, buflen
);
1664 const struct inode_operations proc_pid_link_inode_operations
= {
1665 .readlink
= proc_pid_readlink
,
1666 .get_link
= proc_pid_get_link
,
1667 .setattr
= proc_setattr
,
1671 /* building an inode */
1673 void task_dump_owner(struct task_struct
*task
, umode_t mode
,
1674 kuid_t
*ruid
, kgid_t
*rgid
)
1676 /* Depending on the state of dumpable compute who should own a
1677 * proc file for a task.
1679 const struct cred
*cred
;
1683 if (unlikely(task
->flags
& PF_KTHREAD
)) {
1684 *ruid
= GLOBAL_ROOT_UID
;
1685 *rgid
= GLOBAL_ROOT_GID
;
1689 /* Default to the tasks effective ownership */
1691 cred
= __task_cred(task
);
1697 * Before the /proc/pid/status file was created the only way to read
1698 * the effective uid of a /process was to stat /proc/pid. Reading
1699 * /proc/pid/status is slow enough that procps and other packages
1700 * kept stating /proc/pid. To keep the rules in /proc simple I have
1701 * made this apply to all per process world readable and executable
1704 if (mode
!= (S_IFDIR
|S_IRUGO
|S_IXUGO
)) {
1705 struct mm_struct
*mm
;
1708 /* Make non-dumpable tasks owned by some root */
1710 if (get_dumpable(mm
) != SUID_DUMP_USER
) {
1711 struct user_namespace
*user_ns
= mm
->user_ns
;
1713 uid
= make_kuid(user_ns
, 0);
1714 if (!uid_valid(uid
))
1715 uid
= GLOBAL_ROOT_UID
;
1717 gid
= make_kgid(user_ns
, 0);
1718 if (!gid_valid(gid
))
1719 gid
= GLOBAL_ROOT_GID
;
1722 uid
= GLOBAL_ROOT_UID
;
1723 gid
= GLOBAL_ROOT_GID
;
1731 struct inode
*proc_pid_make_inode(struct super_block
* sb
,
1732 struct task_struct
*task
, umode_t mode
)
1734 struct inode
* inode
;
1735 struct proc_inode
*ei
;
1737 /* We need a new inode */
1739 inode
= new_inode(sb
);
1745 inode
->i_mode
= mode
;
1746 inode
->i_ino
= get_next_ino();
1747 inode
->i_mtime
= inode
->i_atime
= inode
->i_ctime
= current_time(inode
);
1748 inode
->i_op
= &proc_def_inode_operations
;
1751 * grab the reference to task.
1753 ei
->pid
= get_task_pid(task
, PIDTYPE_PID
);
1757 task_dump_owner(task
, 0, &inode
->i_uid
, &inode
->i_gid
);
1758 security_task_to_inode(task
, inode
);
1768 int pid_getattr(const struct path
*path
, struct kstat
*stat
,
1769 u32 request_mask
, unsigned int query_flags
)
1771 struct inode
*inode
= d_inode(path
->dentry
);
1772 struct pid_namespace
*pid
= proc_pid_ns(inode
);
1773 struct task_struct
*task
;
1775 generic_fillattr(inode
, stat
);
1777 stat
->uid
= GLOBAL_ROOT_UID
;
1778 stat
->gid
= GLOBAL_ROOT_GID
;
1780 task
= pid_task(proc_pid(inode
), PIDTYPE_PID
);
1782 if (!has_pid_permissions(pid
, task
, HIDEPID_INVISIBLE
)) {
1785 * This doesn't prevent learning whether PID exists,
1786 * it only makes getattr() consistent with readdir().
1790 task_dump_owner(task
, inode
->i_mode
, &stat
->uid
, &stat
->gid
);
1799 * Set <pid>/... inode ownership (can change due to setuid(), etc.)
1801 void pid_update_inode(struct task_struct
*task
, struct inode
*inode
)
1803 task_dump_owner(task
, inode
->i_mode
, &inode
->i_uid
, &inode
->i_gid
);
1805 inode
->i_mode
&= ~(S_ISUID
| S_ISGID
);
1806 security_task_to_inode(task
, inode
);
1810 * Rewrite the inode's ownerships here because the owning task may have
1811 * performed a setuid(), etc.
1814 static int pid_revalidate(struct dentry
*dentry
, unsigned int flags
)
1816 struct inode
*inode
;
1817 struct task_struct
*task
;
1819 if (flags
& LOOKUP_RCU
)
1822 inode
= d_inode(dentry
);
1823 task
= get_proc_task(inode
);
1826 pid_update_inode(task
, inode
);
1827 put_task_struct(task
);
1833 static inline bool proc_inode_is_dead(struct inode
*inode
)
1835 return !proc_pid(inode
)->tasks
[PIDTYPE_PID
].first
;
1838 int pid_delete_dentry(const struct dentry
*dentry
)
1840 /* Is the task we represent dead?
1841 * If so, then don't put the dentry on the lru list,
1842 * kill it immediately.
1844 return proc_inode_is_dead(d_inode(dentry
));
1847 const struct dentry_operations pid_dentry_operations
=
1849 .d_revalidate
= pid_revalidate
,
1850 .d_delete
= pid_delete_dentry
,
1856 * Fill a directory entry.
1858 * If possible create the dcache entry and derive our inode number and
1859 * file type from dcache entry.
1861 * Since all of the proc inode numbers are dynamically generated, the inode
1862 * numbers do not exist until the inode is cache. This means creating the
1863 * the dcache entry in readdir is necessary to keep the inode numbers
1864 * reported by readdir in sync with the inode numbers reported
1867 bool proc_fill_cache(struct file
*file
, struct dir_context
*ctx
,
1868 const char *name
, unsigned int len
,
1869 instantiate_t instantiate
, struct task_struct
*task
, const void *ptr
)
1871 struct dentry
*child
, *dir
= file
->f_path
.dentry
;
1872 struct qstr qname
= QSTR_INIT(name
, len
);
1873 struct inode
*inode
;
1874 unsigned type
= DT_UNKNOWN
;
1877 child
= d_hash_and_lookup(dir
, &qname
);
1879 DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq
);
1880 child
= d_alloc_parallel(dir
, &qname
, &wq
);
1882 goto end_instantiate
;
1883 if (d_in_lookup(child
)) {
1885 res
= instantiate(child
, task
, ptr
);
1886 d_lookup_done(child
);
1887 if (unlikely(res
)) {
1891 goto end_instantiate
;
1895 inode
= d_inode(child
);
1897 type
= inode
->i_mode
>> 12;
1900 return dir_emit(ctx
, name
, len
, ino
, type
);
1904 * dname_to_vma_addr - maps a dentry name into two unsigned longs
1905 * which represent vma start and end addresses.
1907 static int dname_to_vma_addr(struct dentry
*dentry
,
1908 unsigned long *start
, unsigned long *end
)
1910 const char *str
= dentry
->d_name
.name
;
1911 unsigned long long sval
, eval
;
1914 if (str
[0] == '0' && str
[1] != '-')
1916 len
= _parse_integer(str
, 16, &sval
);
1917 if (len
& KSTRTOX_OVERFLOW
)
1919 if (sval
!= (unsigned long)sval
)
1927 if (str
[0] == '0' && str
[1])
1929 len
= _parse_integer(str
, 16, &eval
);
1930 if (len
& KSTRTOX_OVERFLOW
)
1932 if (eval
!= (unsigned long)eval
)
1945 static int map_files_d_revalidate(struct dentry
*dentry
, unsigned int flags
)
1947 unsigned long vm_start
, vm_end
;
1948 bool exact_vma_exists
= false;
1949 struct mm_struct
*mm
= NULL
;
1950 struct task_struct
*task
;
1951 struct inode
*inode
;
1954 if (flags
& LOOKUP_RCU
)
1957 inode
= d_inode(dentry
);
1958 task
= get_proc_task(inode
);
1962 mm
= mm_access(task
, PTRACE_MODE_READ_FSCREDS
);
1963 if (IS_ERR_OR_NULL(mm
))
1966 if (!dname_to_vma_addr(dentry
, &vm_start
, &vm_end
)) {
1967 down_read(&mm
->mmap_sem
);
1968 exact_vma_exists
= !!find_exact_vma(mm
, vm_start
, vm_end
);
1969 up_read(&mm
->mmap_sem
);
1974 if (exact_vma_exists
) {
1975 task_dump_owner(task
, 0, &inode
->i_uid
, &inode
->i_gid
);
1977 security_task_to_inode(task
, inode
);
1982 put_task_struct(task
);
1988 static const struct dentry_operations tid_map_files_dentry_operations
= {
1989 .d_revalidate
= map_files_d_revalidate
,
1990 .d_delete
= pid_delete_dentry
,
1993 static int map_files_get_link(struct dentry
*dentry
, struct path
*path
)
1995 unsigned long vm_start
, vm_end
;
1996 struct vm_area_struct
*vma
;
1997 struct task_struct
*task
;
1998 struct mm_struct
*mm
;
2002 task
= get_proc_task(d_inode(dentry
));
2006 mm
= get_task_mm(task
);
2007 put_task_struct(task
);
2011 rc
= dname_to_vma_addr(dentry
, &vm_start
, &vm_end
);
2016 down_read(&mm
->mmap_sem
);
2017 vma
= find_exact_vma(mm
, vm_start
, vm_end
);
2018 if (vma
&& vma
->vm_file
) {
2019 *path
= vma
->vm_file
->f_path
;
2023 up_read(&mm
->mmap_sem
);
2031 struct map_files_info
{
2032 unsigned long start
;
2038 * Only allow CAP_SYS_ADMIN to follow the links, due to concerns about how the
2039 * symlinks may be used to bypass permissions on ancestor directories in the
2040 * path to the file in question.
2043 proc_map_files_get_link(struct dentry
*dentry
,
2044 struct inode
*inode
,
2045 struct delayed_call
*done
)
2047 if (!capable(CAP_SYS_ADMIN
))
2048 return ERR_PTR(-EPERM
);
2050 return proc_pid_get_link(dentry
, inode
, done
);
2054 * Identical to proc_pid_link_inode_operations except for get_link()
2056 static const struct inode_operations proc_map_files_link_inode_operations
= {
2057 .readlink
= proc_pid_readlink
,
2058 .get_link
= proc_map_files_get_link
,
2059 .setattr
= proc_setattr
,
2062 static struct dentry
*
2063 proc_map_files_instantiate(struct dentry
*dentry
,
2064 struct task_struct
*task
, const void *ptr
)
2066 fmode_t mode
= (fmode_t
)(unsigned long)ptr
;
2067 struct proc_inode
*ei
;
2068 struct inode
*inode
;
2070 inode
= proc_pid_make_inode(dentry
->d_sb
, task
, S_IFLNK
|
2071 ((mode
& FMODE_READ
) ? S_IRUSR
: 0) |
2072 ((mode
& FMODE_WRITE
) ? S_IWUSR
: 0));
2074 return ERR_PTR(-ENOENT
);
2077 ei
->op
.proc_get_link
= map_files_get_link
;
2079 inode
->i_op
= &proc_map_files_link_inode_operations
;
2082 d_set_d_op(dentry
, &tid_map_files_dentry_operations
);
2083 return d_splice_alias(inode
, dentry
);
2086 static struct dentry
*proc_map_files_lookup(struct inode
*dir
,
2087 struct dentry
*dentry
, unsigned int flags
)
2089 unsigned long vm_start
, vm_end
;
2090 struct vm_area_struct
*vma
;
2091 struct task_struct
*task
;
2092 struct dentry
*result
;
2093 struct mm_struct
*mm
;
2095 result
= ERR_PTR(-ENOENT
);
2096 task
= get_proc_task(dir
);
2100 result
= ERR_PTR(-EACCES
);
2101 if (!ptrace_may_access(task
, PTRACE_MODE_READ_FSCREDS
))
2104 result
= ERR_PTR(-ENOENT
);
2105 if (dname_to_vma_addr(dentry
, &vm_start
, &vm_end
))
2108 mm
= get_task_mm(task
);
2112 down_read(&mm
->mmap_sem
);
2113 vma
= find_exact_vma(mm
, vm_start
, vm_end
);
2118 result
= proc_map_files_instantiate(dentry
, task
,
2119 (void *)(unsigned long)vma
->vm_file
->f_mode
);
2122 up_read(&mm
->mmap_sem
);
2125 put_task_struct(task
);
2130 static const struct inode_operations proc_map_files_inode_operations
= {
2131 .lookup
= proc_map_files_lookup
,
2132 .permission
= proc_fd_permission
,
2133 .setattr
= proc_setattr
,
2137 proc_map_files_readdir(struct file
*file
, struct dir_context
*ctx
)
2139 struct vm_area_struct
*vma
;
2140 struct task_struct
*task
;
2141 struct mm_struct
*mm
;
2142 unsigned long nr_files
, pos
, i
;
2143 struct flex_array
*fa
= NULL
;
2144 struct map_files_info info
;
2145 struct map_files_info
*p
;
2149 task
= get_proc_task(file_inode(file
));
2154 if (!ptrace_may_access(task
, PTRACE_MODE_READ_FSCREDS
))
2158 if (!dir_emit_dots(file
, ctx
))
2161 mm
= get_task_mm(task
);
2164 down_read(&mm
->mmap_sem
);
2169 * We need two passes here:
2171 * 1) Collect vmas of mapped files with mmap_sem taken
2172 * 2) Release mmap_sem and instantiate entries
2174 * otherwise we get lockdep complained, since filldir()
2175 * routine might require mmap_sem taken in might_fault().
2178 for (vma
= mm
->mmap
, pos
= 2; vma
; vma
= vma
->vm_next
) {
2179 if (vma
->vm_file
&& ++pos
> ctx
->pos
)
2184 fa
= flex_array_alloc(sizeof(info
), nr_files
,
2186 if (!fa
|| flex_array_prealloc(fa
, 0, nr_files
,
2190 flex_array_free(fa
);
2191 up_read(&mm
->mmap_sem
);
2195 for (i
= 0, vma
= mm
->mmap
, pos
= 2; vma
;
2196 vma
= vma
->vm_next
) {
2199 if (++pos
<= ctx
->pos
)
2202 info
.start
= vma
->vm_start
;
2203 info
.end
= vma
->vm_end
;
2204 info
.mode
= vma
->vm_file
->f_mode
;
2205 if (flex_array_put(fa
, i
++, &info
, GFP_KERNEL
))
2209 up_read(&mm
->mmap_sem
);
2212 for (i
= 0; i
< nr_files
; i
++) {
2213 char buf
[4 * sizeof(long) + 2]; /* max: %lx-%lx\0 */
2216 p
= flex_array_get(fa
, i
);
2217 len
= snprintf(buf
, sizeof(buf
), "%lx-%lx", p
->start
, p
->end
);
2218 if (!proc_fill_cache(file
, ctx
,
2220 proc_map_files_instantiate
,
2222 (void *)(unsigned long)p
->mode
))
2227 flex_array_free(fa
);
2230 put_task_struct(task
);
2235 static const struct file_operations proc_map_files_operations
= {
2236 .read
= generic_read_dir
,
2237 .iterate_shared
= proc_map_files_readdir
,
2238 .llseek
= generic_file_llseek
,
2241 #if defined(CONFIG_CHECKPOINT_RESTORE) && defined(CONFIG_POSIX_TIMERS)
2242 struct timers_private
{
2244 struct task_struct
*task
;
2245 struct sighand_struct
*sighand
;
2246 struct pid_namespace
*ns
;
2247 unsigned long flags
;
2250 static void *timers_start(struct seq_file
*m
, loff_t
*pos
)
2252 struct timers_private
*tp
= m
->private;
2254 tp
->task
= get_pid_task(tp
->pid
, PIDTYPE_PID
);
2256 return ERR_PTR(-ESRCH
);
2258 tp
->sighand
= lock_task_sighand(tp
->task
, &tp
->flags
);
2260 return ERR_PTR(-ESRCH
);
2262 return seq_list_start(&tp
->task
->signal
->posix_timers
, *pos
);
2265 static void *timers_next(struct seq_file
*m
, void *v
, loff_t
*pos
)
2267 struct timers_private
*tp
= m
->private;
2268 return seq_list_next(v
, &tp
->task
->signal
->posix_timers
, pos
);
2271 static void timers_stop(struct seq_file
*m
, void *v
)
2273 struct timers_private
*tp
= m
->private;
2276 unlock_task_sighand(tp
->task
, &tp
->flags
);
2281 put_task_struct(tp
->task
);
2286 static int show_timer(struct seq_file
*m
, void *v
)
2288 struct k_itimer
*timer
;
2289 struct timers_private
*tp
= m
->private;
2291 static const char * const nstr
[] = {
2292 [SIGEV_SIGNAL
] = "signal",
2293 [SIGEV_NONE
] = "none",
2294 [SIGEV_THREAD
] = "thread",
2297 timer
= list_entry((struct list_head
*)v
, struct k_itimer
, list
);
2298 notify
= timer
->it_sigev_notify
;
2300 seq_printf(m
, "ID: %d\n", timer
->it_id
);
2301 seq_printf(m
, "signal: %d/%px\n",
2302 timer
->sigq
->info
.si_signo
,
2303 timer
->sigq
->info
.si_value
.sival_ptr
);
2304 seq_printf(m
, "notify: %s/%s.%d\n",
2305 nstr
[notify
& ~SIGEV_THREAD_ID
],
2306 (notify
& SIGEV_THREAD_ID
) ? "tid" : "pid",
2307 pid_nr_ns(timer
->it_pid
, tp
->ns
));
2308 seq_printf(m
, "ClockID: %d\n", timer
->it_clock
);
2313 static const struct seq_operations proc_timers_seq_ops
= {
2314 .start
= timers_start
,
2315 .next
= timers_next
,
2316 .stop
= timers_stop
,
2320 static int proc_timers_open(struct inode
*inode
, struct file
*file
)
2322 struct timers_private
*tp
;
2324 tp
= __seq_open_private(file
, &proc_timers_seq_ops
,
2325 sizeof(struct timers_private
));
2329 tp
->pid
= proc_pid(inode
);
2330 tp
->ns
= proc_pid_ns(inode
);
2334 static const struct file_operations proc_timers_operations
= {
2335 .open
= proc_timers_open
,
2337 .llseek
= seq_lseek
,
2338 .release
= seq_release_private
,
2342 static ssize_t
timerslack_ns_write(struct file
*file
, const char __user
*buf
,
2343 size_t count
, loff_t
*offset
)
2345 struct inode
*inode
= file_inode(file
);
2346 struct task_struct
*p
;
2350 err
= kstrtoull_from_user(buf
, count
, 10, &slack_ns
);
2354 p
= get_proc_task(inode
);
2359 if (!capable(CAP_SYS_NICE
)) {
2364 err
= security_task_setscheduler(p
);
2373 p
->timer_slack_ns
= p
->default_timer_slack_ns
;
2375 p
->timer_slack_ns
= slack_ns
;
2384 static int timerslack_ns_show(struct seq_file
*m
, void *v
)
2386 struct inode
*inode
= m
->private;
2387 struct task_struct
*p
;
2390 p
= get_proc_task(inode
);
2396 if (!capable(CAP_SYS_NICE
)) {
2400 err
= security_task_getscheduler(p
);
2406 seq_printf(m
, "%llu\n", p
->timer_slack_ns
);
2415 static int timerslack_ns_open(struct inode
*inode
, struct file
*filp
)
2417 return single_open(filp
, timerslack_ns_show
, inode
);
2420 static const struct file_operations proc_pid_set_timerslack_ns_operations
= {
2421 .open
= timerslack_ns_open
,
2423 .write
= timerslack_ns_write
,
2424 .llseek
= seq_lseek
,
2425 .release
= single_release
,
2428 static struct dentry
*proc_pident_instantiate(struct dentry
*dentry
,
2429 struct task_struct
*task
, const void *ptr
)
2431 const struct pid_entry
*p
= ptr
;
2432 struct inode
*inode
;
2433 struct proc_inode
*ei
;
2435 inode
= proc_pid_make_inode(dentry
->d_sb
, task
, p
->mode
);
2437 return ERR_PTR(-ENOENT
);
2440 if (S_ISDIR(inode
->i_mode
))
2441 set_nlink(inode
, 2); /* Use getattr to fix if necessary */
2443 inode
->i_op
= p
->iop
;
2445 inode
->i_fop
= p
->fop
;
2447 pid_update_inode(task
, inode
);
2448 d_set_d_op(dentry
, &pid_dentry_operations
);
2449 return d_splice_alias(inode
, dentry
);
2452 static struct dentry
*proc_pident_lookup(struct inode
*dir
,
2453 struct dentry
*dentry
,
2454 const struct pid_entry
*ents
,
2457 struct task_struct
*task
= get_proc_task(dir
);
2458 const struct pid_entry
*p
, *last
;
2459 struct dentry
*res
= ERR_PTR(-ENOENT
);
2465 * Yes, it does not scale. And it should not. Don't add
2466 * new entries into /proc/<tgid>/ without very good reasons.
2468 last
= &ents
[nents
];
2469 for (p
= ents
; p
< last
; p
++) {
2470 if (p
->len
!= dentry
->d_name
.len
)
2472 if (!memcmp(dentry
->d_name
.name
, p
->name
, p
->len
)) {
2473 res
= proc_pident_instantiate(dentry
, task
, p
);
2477 put_task_struct(task
);
2482 static int proc_pident_readdir(struct file
*file
, struct dir_context
*ctx
,
2483 const struct pid_entry
*ents
, unsigned int nents
)
2485 struct task_struct
*task
= get_proc_task(file_inode(file
));
2486 const struct pid_entry
*p
;
2491 if (!dir_emit_dots(file
, ctx
))
2494 if (ctx
->pos
>= nents
+ 2)
2497 for (p
= ents
+ (ctx
->pos
- 2); p
< ents
+ nents
; p
++) {
2498 if (!proc_fill_cache(file
, ctx
, p
->name
, p
->len
,
2499 proc_pident_instantiate
, task
, p
))
2504 put_task_struct(task
);
2508 #ifdef CONFIG_SECURITY
2509 static ssize_t
proc_pid_attr_read(struct file
* file
, char __user
* buf
,
2510 size_t count
, loff_t
*ppos
)
2512 struct inode
* inode
= file_inode(file
);
2515 struct task_struct
*task
= get_proc_task(inode
);
2520 length
= security_getprocattr(task
,
2521 (char*)file
->f_path
.dentry
->d_name
.name
,
2523 put_task_struct(task
);
2525 length
= simple_read_from_buffer(buf
, count
, ppos
, p
, length
);
2530 static ssize_t
proc_pid_attr_write(struct file
* file
, const char __user
* buf
,
2531 size_t count
, loff_t
*ppos
)
2533 struct inode
* inode
= file_inode(file
);
2534 struct task_struct
*task
;
2539 task
= pid_task(proc_pid(inode
), PIDTYPE_PID
);
2544 /* A task may only write its own attributes. */
2545 if (current
!= task
) {
2551 if (count
> PAGE_SIZE
)
2554 /* No partial writes. */
2558 page
= memdup_user(buf
, count
);
2564 /* Guard against adverse ptrace interaction */
2565 rv
= mutex_lock_interruptible(¤t
->signal
->cred_guard_mutex
);
2569 rv
= security_setprocattr(file
->f_path
.dentry
->d_name
.name
, page
, count
);
2570 mutex_unlock(¤t
->signal
->cred_guard_mutex
);
2577 static const struct file_operations proc_pid_attr_operations
= {
2578 .read
= proc_pid_attr_read
,
2579 .write
= proc_pid_attr_write
,
2580 .llseek
= generic_file_llseek
,
2583 static const struct pid_entry attr_dir_stuff
[] = {
2584 REG("current", S_IRUGO
|S_IWUGO
, proc_pid_attr_operations
),
2585 REG("prev", S_IRUGO
, proc_pid_attr_operations
),
2586 REG("exec", S_IRUGO
|S_IWUGO
, proc_pid_attr_operations
),
2587 REG("fscreate", S_IRUGO
|S_IWUGO
, proc_pid_attr_operations
),
2588 REG("keycreate", S_IRUGO
|S_IWUGO
, proc_pid_attr_operations
),
2589 REG("sockcreate", S_IRUGO
|S_IWUGO
, proc_pid_attr_operations
),
2592 static int proc_attr_dir_readdir(struct file
*file
, struct dir_context
*ctx
)
2594 return proc_pident_readdir(file
, ctx
,
2595 attr_dir_stuff
, ARRAY_SIZE(attr_dir_stuff
));
2598 static const struct file_operations proc_attr_dir_operations
= {
2599 .read
= generic_read_dir
,
2600 .iterate_shared
= proc_attr_dir_readdir
,
2601 .llseek
= generic_file_llseek
,
2604 static struct dentry
*proc_attr_dir_lookup(struct inode
*dir
,
2605 struct dentry
*dentry
, unsigned int flags
)
2607 return proc_pident_lookup(dir
, dentry
,
2608 attr_dir_stuff
, ARRAY_SIZE(attr_dir_stuff
));
2611 static const struct inode_operations proc_attr_dir_inode_operations
= {
2612 .lookup
= proc_attr_dir_lookup
,
2613 .getattr
= pid_getattr
,
2614 .setattr
= proc_setattr
,
2619 #ifdef CONFIG_ELF_CORE
2620 static ssize_t
proc_coredump_filter_read(struct file
*file
, char __user
*buf
,
2621 size_t count
, loff_t
*ppos
)
2623 struct task_struct
*task
= get_proc_task(file_inode(file
));
2624 struct mm_struct
*mm
;
2625 char buffer
[PROC_NUMBUF
];
2633 mm
= get_task_mm(task
);
2635 len
= snprintf(buffer
, sizeof(buffer
), "%08lx\n",
2636 ((mm
->flags
& MMF_DUMP_FILTER_MASK
) >>
2637 MMF_DUMP_FILTER_SHIFT
));
2639 ret
= simple_read_from_buffer(buf
, count
, ppos
, buffer
, len
);
2642 put_task_struct(task
);
2647 static ssize_t
proc_coredump_filter_write(struct file
*file
,
2648 const char __user
*buf
,
2652 struct task_struct
*task
;
2653 struct mm_struct
*mm
;
2659 ret
= kstrtouint_from_user(buf
, count
, 0, &val
);
2664 task
= get_proc_task(file_inode(file
));
2668 mm
= get_task_mm(task
);
2673 for (i
= 0, mask
= 1; i
< MMF_DUMP_FILTER_BITS
; i
++, mask
<<= 1) {
2675 set_bit(i
+ MMF_DUMP_FILTER_SHIFT
, &mm
->flags
);
2677 clear_bit(i
+ MMF_DUMP_FILTER_SHIFT
, &mm
->flags
);
2682 put_task_struct(task
);
2689 static const struct file_operations proc_coredump_filter_operations
= {
2690 .read
= proc_coredump_filter_read
,
2691 .write
= proc_coredump_filter_write
,
2692 .llseek
= generic_file_llseek
,
2696 #ifdef CONFIG_TASK_IO_ACCOUNTING
2697 static int do_io_accounting(struct task_struct
*task
, struct seq_file
*m
, int whole
)
2699 struct task_io_accounting acct
= task
->ioac
;
2700 unsigned long flags
;
2703 result
= mutex_lock_killable(&task
->signal
->cred_guard_mutex
);
2707 if (!ptrace_may_access(task
, PTRACE_MODE_READ_FSCREDS
)) {
2712 if (whole
&& lock_task_sighand(task
, &flags
)) {
2713 struct task_struct
*t
= task
;
2715 task_io_accounting_add(&acct
, &task
->signal
->ioac
);
2716 while_each_thread(task
, t
)
2717 task_io_accounting_add(&acct
, &t
->ioac
);
2719 unlock_task_sighand(task
, &flags
);
2726 "read_bytes: %llu\n"
2727 "write_bytes: %llu\n"
2728 "cancelled_write_bytes: %llu\n",
2729 (unsigned long long)acct
.rchar
,
2730 (unsigned long long)acct
.wchar
,
2731 (unsigned long long)acct
.syscr
,
2732 (unsigned long long)acct
.syscw
,
2733 (unsigned long long)acct
.read_bytes
,
2734 (unsigned long long)acct
.write_bytes
,
2735 (unsigned long long)acct
.cancelled_write_bytes
);
2739 mutex_unlock(&task
->signal
->cred_guard_mutex
);
2743 static int proc_tid_io_accounting(struct seq_file
*m
, struct pid_namespace
*ns
,
2744 struct pid
*pid
, struct task_struct
*task
)
2746 return do_io_accounting(task
, m
, 0);
2749 static int proc_tgid_io_accounting(struct seq_file
*m
, struct pid_namespace
*ns
,
2750 struct pid
*pid
, struct task_struct
*task
)
2752 return do_io_accounting(task
, m
, 1);
2754 #endif /* CONFIG_TASK_IO_ACCOUNTING */
2756 #ifdef CONFIG_USER_NS
2757 static int proc_id_map_open(struct inode
*inode
, struct file
*file
,
2758 const struct seq_operations
*seq_ops
)
2760 struct user_namespace
*ns
= NULL
;
2761 struct task_struct
*task
;
2762 struct seq_file
*seq
;
2765 task
= get_proc_task(inode
);
2768 ns
= get_user_ns(task_cred_xxx(task
, user_ns
));
2770 put_task_struct(task
);
2775 ret
= seq_open(file
, seq_ops
);
2779 seq
= file
->private_data
;
2789 static int proc_id_map_release(struct inode
*inode
, struct file
*file
)
2791 struct seq_file
*seq
= file
->private_data
;
2792 struct user_namespace
*ns
= seq
->private;
2794 return seq_release(inode
, file
);
2797 static int proc_uid_map_open(struct inode
*inode
, struct file
*file
)
2799 return proc_id_map_open(inode
, file
, &proc_uid_seq_operations
);
2802 static int proc_gid_map_open(struct inode
*inode
, struct file
*file
)
2804 return proc_id_map_open(inode
, file
, &proc_gid_seq_operations
);
2807 static int proc_projid_map_open(struct inode
*inode
, struct file
*file
)
2809 return proc_id_map_open(inode
, file
, &proc_projid_seq_operations
);
2812 static const struct file_operations proc_uid_map_operations
= {
2813 .open
= proc_uid_map_open
,
2814 .write
= proc_uid_map_write
,
2816 .llseek
= seq_lseek
,
2817 .release
= proc_id_map_release
,
2820 static const struct file_operations proc_gid_map_operations
= {
2821 .open
= proc_gid_map_open
,
2822 .write
= proc_gid_map_write
,
2824 .llseek
= seq_lseek
,
2825 .release
= proc_id_map_release
,
2828 static const struct file_operations proc_projid_map_operations
= {
2829 .open
= proc_projid_map_open
,
2830 .write
= proc_projid_map_write
,
2832 .llseek
= seq_lseek
,
2833 .release
= proc_id_map_release
,
2836 static int proc_setgroups_open(struct inode
*inode
, struct file
*file
)
2838 struct user_namespace
*ns
= NULL
;
2839 struct task_struct
*task
;
2843 task
= get_proc_task(inode
);
2846 ns
= get_user_ns(task_cred_xxx(task
, user_ns
));
2848 put_task_struct(task
);
2853 if (file
->f_mode
& FMODE_WRITE
) {
2855 if (!ns_capable(ns
, CAP_SYS_ADMIN
))
2859 ret
= single_open(file
, &proc_setgroups_show
, ns
);
2870 static int proc_setgroups_release(struct inode
*inode
, struct file
*file
)
2872 struct seq_file
*seq
= file
->private_data
;
2873 struct user_namespace
*ns
= seq
->private;
2874 int ret
= single_release(inode
, file
);
2879 static const struct file_operations proc_setgroups_operations
= {
2880 .open
= proc_setgroups_open
,
2881 .write
= proc_setgroups_write
,
2883 .llseek
= seq_lseek
,
2884 .release
= proc_setgroups_release
,
2886 #endif /* CONFIG_USER_NS */
2888 static int proc_pid_personality(struct seq_file
*m
, struct pid_namespace
*ns
,
2889 struct pid
*pid
, struct task_struct
*task
)
2891 int err
= lock_trace(task
);
2893 seq_printf(m
, "%08x\n", task
->personality
);
2899 #ifdef CONFIG_LIVEPATCH
2900 static int proc_pid_patch_state(struct seq_file
*m
, struct pid_namespace
*ns
,
2901 struct pid
*pid
, struct task_struct
*task
)
2903 seq_printf(m
, "%d\n", task
->patch_state
);
2906 #endif /* CONFIG_LIVEPATCH */
2911 static const struct file_operations proc_task_operations
;
2912 static const struct inode_operations proc_task_inode_operations
;
2914 static const struct pid_entry tgid_base_stuff
[] = {
2915 DIR("task", S_IRUGO
|S_IXUGO
, proc_task_inode_operations
, proc_task_operations
),
2916 DIR("fd", S_IRUSR
|S_IXUSR
, proc_fd_inode_operations
, proc_fd_operations
),
2917 DIR("map_files", S_IRUSR
|S_IXUSR
, proc_map_files_inode_operations
, proc_map_files_operations
),
2918 DIR("fdinfo", S_IRUSR
|S_IXUSR
, proc_fdinfo_inode_operations
, proc_fdinfo_operations
),
2919 DIR("ns", S_IRUSR
|S_IXUGO
, proc_ns_dir_inode_operations
, proc_ns_dir_operations
),
2921 DIR("net", S_IRUGO
|S_IXUGO
, proc_net_inode_operations
, proc_net_operations
),
2923 REG("environ", S_IRUSR
, proc_environ_operations
),
2924 REG("auxv", S_IRUSR
, proc_auxv_operations
),
2925 ONE("status", S_IRUGO
, proc_pid_status
),
2926 ONE("personality", S_IRUSR
, proc_pid_personality
),
2927 ONE("limits", S_IRUGO
, proc_pid_limits
),
2928 #ifdef CONFIG_SCHED_DEBUG
2929 REG("sched", S_IRUGO
|S_IWUSR
, proc_pid_sched_operations
),
2931 #ifdef CONFIG_SCHED_AUTOGROUP
2932 REG("autogroup", S_IRUGO
|S_IWUSR
, proc_pid_sched_autogroup_operations
),
2934 REG("comm", S_IRUGO
|S_IWUSR
, proc_pid_set_comm_operations
),
2935 #ifdef CONFIG_HAVE_ARCH_TRACEHOOK
2936 ONE("syscall", S_IRUSR
, proc_pid_syscall
),
2938 REG("cmdline", S_IRUGO
, proc_pid_cmdline_ops
),
2939 ONE("stat", S_IRUGO
, proc_tgid_stat
),
2940 ONE("statm", S_IRUGO
, proc_pid_statm
),
2941 REG("maps", S_IRUGO
, proc_pid_maps_operations
),
2943 REG("numa_maps", S_IRUGO
, proc_pid_numa_maps_operations
),
2945 REG("mem", S_IRUSR
|S_IWUSR
, proc_mem_operations
),
2946 LNK("cwd", proc_cwd_link
),
2947 LNK("root", proc_root_link
),
2948 LNK("exe", proc_exe_link
),
2949 REG("mounts", S_IRUGO
, proc_mounts_operations
),
2950 REG("mountinfo", S_IRUGO
, proc_mountinfo_operations
),
2951 REG("mountstats", S_IRUSR
, proc_mountstats_operations
),
2952 #ifdef CONFIG_PROC_PAGE_MONITOR
2953 REG("clear_refs", S_IWUSR
, proc_clear_refs_operations
),
2954 REG("smaps", S_IRUGO
, proc_pid_smaps_operations
),
2955 REG("smaps_rollup", S_IRUGO
, proc_pid_smaps_rollup_operations
),
2956 REG("pagemap", S_IRUSR
, proc_pagemap_operations
),
2958 #ifdef CONFIG_SECURITY
2959 DIR("attr", S_IRUGO
|S_IXUGO
, proc_attr_dir_inode_operations
, proc_attr_dir_operations
),
2961 #ifdef CONFIG_KALLSYMS
2962 ONE("wchan", S_IRUGO
, proc_pid_wchan
),
2964 #ifdef CONFIG_STACKTRACE
2965 ONE("stack", S_IRUSR
, proc_pid_stack
),
2967 #ifdef CONFIG_SCHED_INFO
2968 ONE("schedstat", S_IRUGO
, proc_pid_schedstat
),
2970 #ifdef CONFIG_LATENCYTOP
2971 REG("latency", S_IRUGO
, proc_lstats_operations
),
2973 #ifdef CONFIG_PROC_PID_CPUSET
2974 ONE("cpuset", S_IRUGO
, proc_cpuset_show
),
2976 #ifdef CONFIG_CGROUPS
2977 ONE("cgroup", S_IRUGO
, proc_cgroup_show
),
2979 ONE("oom_score", S_IRUGO
, proc_oom_score
),
2980 REG("oom_adj", S_IRUGO
|S_IWUSR
, proc_oom_adj_operations
),
2981 REG("oom_score_adj", S_IRUGO
|S_IWUSR
, proc_oom_score_adj_operations
),
2982 #ifdef CONFIG_AUDITSYSCALL
2983 REG("loginuid", S_IWUSR
|S_IRUGO
, proc_loginuid_operations
),
2984 REG("sessionid", S_IRUGO
, proc_sessionid_operations
),
2986 #ifdef CONFIG_FAULT_INJECTION
2987 REG("make-it-fail", S_IRUGO
|S_IWUSR
, proc_fault_inject_operations
),
2988 REG("fail-nth", 0644, proc_fail_nth_operations
),
2990 #ifdef CONFIG_ELF_CORE
2991 REG("coredump_filter", S_IRUGO
|S_IWUSR
, proc_coredump_filter_operations
),
2993 #ifdef CONFIG_TASK_IO_ACCOUNTING
2994 ONE("io", S_IRUSR
, proc_tgid_io_accounting
),
2996 #ifdef CONFIG_USER_NS
2997 REG("uid_map", S_IRUGO
|S_IWUSR
, proc_uid_map_operations
),
2998 REG("gid_map", S_IRUGO
|S_IWUSR
, proc_gid_map_operations
),
2999 REG("projid_map", S_IRUGO
|S_IWUSR
, proc_projid_map_operations
),
3000 REG("setgroups", S_IRUGO
|S_IWUSR
, proc_setgroups_operations
),
3002 #if defined(CONFIG_CHECKPOINT_RESTORE) && defined(CONFIG_POSIX_TIMERS)
3003 REG("timers", S_IRUGO
, proc_timers_operations
),
3005 REG("timerslack_ns", S_IRUGO
|S_IWUGO
, proc_pid_set_timerslack_ns_operations
),
3006 #ifdef CONFIG_LIVEPATCH
3007 ONE("patch_state", S_IRUSR
, proc_pid_patch_state
),
3011 static int proc_tgid_base_readdir(struct file
*file
, struct dir_context
*ctx
)
3013 return proc_pident_readdir(file
, ctx
,
3014 tgid_base_stuff
, ARRAY_SIZE(tgid_base_stuff
));
3017 static const struct file_operations proc_tgid_base_operations
= {
3018 .read
= generic_read_dir
,
3019 .iterate_shared
= proc_tgid_base_readdir
,
3020 .llseek
= generic_file_llseek
,
3023 static struct dentry
*proc_tgid_base_lookup(struct inode
*dir
, struct dentry
*dentry
, unsigned int flags
)
3025 return proc_pident_lookup(dir
, dentry
,
3026 tgid_base_stuff
, ARRAY_SIZE(tgid_base_stuff
));
3029 static const struct inode_operations proc_tgid_base_inode_operations
= {
3030 .lookup
= proc_tgid_base_lookup
,
3031 .getattr
= pid_getattr
,
3032 .setattr
= proc_setattr
,
3033 .permission
= proc_pid_permission
,
3036 static void proc_flush_task_mnt(struct vfsmount
*mnt
, pid_t pid
, pid_t tgid
)
3038 struct dentry
*dentry
, *leader
, *dir
;
3043 name
.len
= snprintf(buf
, sizeof(buf
), "%u", pid
);
3044 /* no ->d_hash() rejects on procfs */
3045 dentry
= d_hash_and_lookup(mnt
->mnt_root
, &name
);
3047 d_invalidate(dentry
);
3055 name
.len
= snprintf(buf
, sizeof(buf
), "%u", tgid
);
3056 leader
= d_hash_and_lookup(mnt
->mnt_root
, &name
);
3061 name
.len
= strlen(name
.name
);
3062 dir
= d_hash_and_lookup(leader
, &name
);
3064 goto out_put_leader
;
3067 name
.len
= snprintf(buf
, sizeof(buf
), "%u", pid
);
3068 dentry
= d_hash_and_lookup(dir
, &name
);
3070 d_invalidate(dentry
);
3082 * proc_flush_task - Remove dcache entries for @task from the /proc dcache.
3083 * @task: task that should be flushed.
3085 * When flushing dentries from proc, one needs to flush them from global
3086 * proc (proc_mnt) and from all the namespaces' procs this task was seen
3087 * in. This call is supposed to do all of this job.
3089 * Looks in the dcache for
3091 * /proc/@tgid/task/@pid
3092 * if either directory is present flushes it and all of it'ts children
3095 * It is safe and reasonable to cache /proc entries for a task until
3096 * that task exits. After that they just clog up the dcache with
3097 * useless entries, possibly causing useful dcache entries to be
3098 * flushed instead. This routine is proved to flush those useless
3099 * dcache entries at process exit time.
3101 * NOTE: This routine is just an optimization so it does not guarantee
3102 * that no dcache entries will exist at process exit time it
3103 * just makes it very unlikely that any will persist.
3106 void proc_flush_task(struct task_struct
*task
)
3109 struct pid
*pid
, *tgid
;
3112 pid
= task_pid(task
);
3113 tgid
= task_tgid(task
);
3115 for (i
= 0; i
<= pid
->level
; i
++) {
3116 upid
= &pid
->numbers
[i
];
3117 proc_flush_task_mnt(upid
->ns
->proc_mnt
, upid
->nr
,
3118 tgid
->numbers
[i
].nr
);
3122 static struct dentry
*proc_pid_instantiate(struct dentry
* dentry
,
3123 struct task_struct
*task
, const void *ptr
)
3125 struct inode
*inode
;
3127 inode
= proc_pid_make_inode(dentry
->d_sb
, task
, S_IFDIR
| S_IRUGO
| S_IXUGO
);
3129 return ERR_PTR(-ENOENT
);
3131 inode
->i_op
= &proc_tgid_base_inode_operations
;
3132 inode
->i_fop
= &proc_tgid_base_operations
;
3133 inode
->i_flags
|=S_IMMUTABLE
;
3135 set_nlink(inode
, nlink_tgid
);
3136 pid_update_inode(task
, inode
);
3138 d_set_d_op(dentry
, &pid_dentry_operations
);
3139 return d_splice_alias(inode
, dentry
);
3142 struct dentry
*proc_pid_lookup(struct inode
*dir
, struct dentry
* dentry
, unsigned int flags
)
3144 struct task_struct
*task
;
3146 struct pid_namespace
*ns
;
3147 struct dentry
*result
= ERR_PTR(-ENOENT
);
3149 tgid
= name_to_int(&dentry
->d_name
);
3153 ns
= dentry
->d_sb
->s_fs_info
;
3155 task
= find_task_by_pid_ns(tgid
, ns
);
3157 get_task_struct(task
);
3162 result
= proc_pid_instantiate(dentry
, task
, NULL
);
3163 put_task_struct(task
);
3169 * Find the first task with tgid >= tgid
3174 struct task_struct
*task
;
3176 static struct tgid_iter
next_tgid(struct pid_namespace
*ns
, struct tgid_iter iter
)
3181 put_task_struct(iter
.task
);
3185 pid
= find_ge_pid(iter
.tgid
, ns
);
3187 iter
.tgid
= pid_nr_ns(pid
, ns
);
3188 iter
.task
= pid_task(pid
, PIDTYPE_PID
);
3189 /* What we to know is if the pid we have find is the
3190 * pid of a thread_group_leader. Testing for task
3191 * being a thread_group_leader is the obvious thing
3192 * todo but there is a window when it fails, due to
3193 * the pid transfer logic in de_thread.
3195 * So we perform the straight forward test of seeing
3196 * if the pid we have found is the pid of a thread
3197 * group leader, and don't worry if the task we have
3198 * found doesn't happen to be a thread group leader.
3199 * As we don't care in the case of readdir.
3201 if (!iter
.task
|| !has_group_leader_pid(iter
.task
)) {
3205 get_task_struct(iter
.task
);
3211 #define TGID_OFFSET (FIRST_PROCESS_ENTRY + 2)
3213 /* for the /proc/ directory itself, after non-process stuff has been done */
3214 int proc_pid_readdir(struct file
*file
, struct dir_context
*ctx
)
3216 struct tgid_iter iter
;
3217 struct pid_namespace
*ns
= proc_pid_ns(file_inode(file
));
3218 loff_t pos
= ctx
->pos
;
3220 if (pos
>= PID_MAX_LIMIT
+ TGID_OFFSET
)
3223 if (pos
== TGID_OFFSET
- 2) {
3224 struct inode
*inode
= d_inode(ns
->proc_self
);
3225 if (!dir_emit(ctx
, "self", 4, inode
->i_ino
, DT_LNK
))
3227 ctx
->pos
= pos
= pos
+ 1;
3229 if (pos
== TGID_OFFSET
- 1) {
3230 struct inode
*inode
= d_inode(ns
->proc_thread_self
);
3231 if (!dir_emit(ctx
, "thread-self", 11, inode
->i_ino
, DT_LNK
))
3233 ctx
->pos
= pos
= pos
+ 1;
3235 iter
.tgid
= pos
- TGID_OFFSET
;
3237 for (iter
= next_tgid(ns
, iter
);
3239 iter
.tgid
+= 1, iter
= next_tgid(ns
, iter
)) {
3244 if (!has_pid_permissions(ns
, iter
.task
, HIDEPID_INVISIBLE
))
3247 len
= snprintf(name
, sizeof(name
), "%u", iter
.tgid
);
3248 ctx
->pos
= iter
.tgid
+ TGID_OFFSET
;
3249 if (!proc_fill_cache(file
, ctx
, name
, len
,
3250 proc_pid_instantiate
, iter
.task
, NULL
)) {
3251 put_task_struct(iter
.task
);
3255 ctx
->pos
= PID_MAX_LIMIT
+ TGID_OFFSET
;
3260 * proc_tid_comm_permission is a special permission function exclusively
3261 * used for the node /proc/<pid>/task/<tid>/comm.
3262 * It bypasses generic permission checks in the case where a task of the same
3263 * task group attempts to access the node.
3264 * The rationale behind this is that glibc and bionic access this node for
3265 * cross thread naming (pthread_set/getname_np(!self)). However, if
3266 * PR_SET_DUMPABLE gets set to 0 this node among others becomes uid=0 gid=0,
3267 * which locks out the cross thread naming implementation.
3268 * This function makes sure that the node is always accessible for members of
3269 * same thread group.
3271 static int proc_tid_comm_permission(struct inode
*inode
, int mask
)
3273 bool is_same_tgroup
;
3274 struct task_struct
*task
;
3276 task
= get_proc_task(inode
);
3279 is_same_tgroup
= same_thread_group(current
, task
);
3280 put_task_struct(task
);
3282 if (likely(is_same_tgroup
&& !(mask
& MAY_EXEC
))) {
3283 /* This file (/proc/<pid>/task/<tid>/comm) can always be
3284 * read or written by the members of the corresponding
3290 return generic_permission(inode
, mask
);
3293 static const struct inode_operations proc_tid_comm_inode_operations
= {
3294 .permission
= proc_tid_comm_permission
,
3300 static const struct pid_entry tid_base_stuff
[] = {
3301 DIR("fd", S_IRUSR
|S_IXUSR
, proc_fd_inode_operations
, proc_fd_operations
),
3302 DIR("fdinfo", S_IRUSR
|S_IXUSR
, proc_fdinfo_inode_operations
, proc_fdinfo_operations
),
3303 DIR("ns", S_IRUSR
|S_IXUGO
, proc_ns_dir_inode_operations
, proc_ns_dir_operations
),
3305 DIR("net", S_IRUGO
|S_IXUGO
, proc_net_inode_operations
, proc_net_operations
),
3307 REG("environ", S_IRUSR
, proc_environ_operations
),
3308 REG("auxv", S_IRUSR
, proc_auxv_operations
),
3309 ONE("status", S_IRUGO
, proc_pid_status
),
3310 ONE("personality", S_IRUSR
, proc_pid_personality
),
3311 ONE("limits", S_IRUGO
, proc_pid_limits
),
3312 #ifdef CONFIG_SCHED_DEBUG
3313 REG("sched", S_IRUGO
|S_IWUSR
, proc_pid_sched_operations
),
3315 NOD("comm", S_IFREG
|S_IRUGO
|S_IWUSR
,
3316 &proc_tid_comm_inode_operations
,
3317 &proc_pid_set_comm_operations
, {}),
3318 #ifdef CONFIG_HAVE_ARCH_TRACEHOOK
3319 ONE("syscall", S_IRUSR
, proc_pid_syscall
),
3321 REG("cmdline", S_IRUGO
, proc_pid_cmdline_ops
),
3322 ONE("stat", S_IRUGO
, proc_tid_stat
),
3323 ONE("statm", S_IRUGO
, proc_pid_statm
),
3324 REG("maps", S_IRUGO
, proc_pid_maps_operations
),
3325 #ifdef CONFIG_PROC_CHILDREN
3326 REG("children", S_IRUGO
, proc_tid_children_operations
),
3329 REG("numa_maps", S_IRUGO
, proc_pid_numa_maps_operations
),
3331 REG("mem", S_IRUSR
|S_IWUSR
, proc_mem_operations
),
3332 LNK("cwd", proc_cwd_link
),
3333 LNK("root", proc_root_link
),
3334 LNK("exe", proc_exe_link
),
3335 REG("mounts", S_IRUGO
, proc_mounts_operations
),
3336 REG("mountinfo", S_IRUGO
, proc_mountinfo_operations
),
3337 #ifdef CONFIG_PROC_PAGE_MONITOR
3338 REG("clear_refs", S_IWUSR
, proc_clear_refs_operations
),
3339 REG("smaps", S_IRUGO
, proc_pid_smaps_operations
),
3340 REG("smaps_rollup", S_IRUGO
, proc_pid_smaps_rollup_operations
),
3341 REG("pagemap", S_IRUSR
, proc_pagemap_operations
),
3343 #ifdef CONFIG_SECURITY
3344 DIR("attr", S_IRUGO
|S_IXUGO
, proc_attr_dir_inode_operations
, proc_attr_dir_operations
),
3346 #ifdef CONFIG_KALLSYMS
3347 ONE("wchan", S_IRUGO
, proc_pid_wchan
),
3349 #ifdef CONFIG_STACKTRACE
3350 ONE("stack", S_IRUSR
, proc_pid_stack
),
3352 #ifdef CONFIG_SCHED_INFO
3353 ONE("schedstat", S_IRUGO
, proc_pid_schedstat
),
3355 #ifdef CONFIG_LATENCYTOP
3356 REG("latency", S_IRUGO
, proc_lstats_operations
),
3358 #ifdef CONFIG_PROC_PID_CPUSET
3359 ONE("cpuset", S_IRUGO
, proc_cpuset_show
),
3361 #ifdef CONFIG_CGROUPS
3362 ONE("cgroup", S_IRUGO
, proc_cgroup_show
),
3364 ONE("oom_score", S_IRUGO
, proc_oom_score
),
3365 REG("oom_adj", S_IRUGO
|S_IWUSR
, proc_oom_adj_operations
),
3366 REG("oom_score_adj", S_IRUGO
|S_IWUSR
, proc_oom_score_adj_operations
),
3367 #ifdef CONFIG_AUDITSYSCALL
3368 REG("loginuid", S_IWUSR
|S_IRUGO
, proc_loginuid_operations
),
3369 REG("sessionid", S_IRUGO
, proc_sessionid_operations
),
3371 #ifdef CONFIG_FAULT_INJECTION
3372 REG("make-it-fail", S_IRUGO
|S_IWUSR
, proc_fault_inject_operations
),
3373 REG("fail-nth", 0644, proc_fail_nth_operations
),
3375 #ifdef CONFIG_TASK_IO_ACCOUNTING
3376 ONE("io", S_IRUSR
, proc_tid_io_accounting
),
3378 #ifdef CONFIG_USER_NS
3379 REG("uid_map", S_IRUGO
|S_IWUSR
, proc_uid_map_operations
),
3380 REG("gid_map", S_IRUGO
|S_IWUSR
, proc_gid_map_operations
),
3381 REG("projid_map", S_IRUGO
|S_IWUSR
, proc_projid_map_operations
),
3382 REG("setgroups", S_IRUGO
|S_IWUSR
, proc_setgroups_operations
),
3384 #ifdef CONFIG_LIVEPATCH
3385 ONE("patch_state", S_IRUSR
, proc_pid_patch_state
),
3389 static int proc_tid_base_readdir(struct file
*file
, struct dir_context
*ctx
)
3391 return proc_pident_readdir(file
, ctx
,
3392 tid_base_stuff
, ARRAY_SIZE(tid_base_stuff
));
3395 static struct dentry
*proc_tid_base_lookup(struct inode
*dir
, struct dentry
*dentry
, unsigned int flags
)
3397 return proc_pident_lookup(dir
, dentry
,
3398 tid_base_stuff
, ARRAY_SIZE(tid_base_stuff
));
3401 static const struct file_operations proc_tid_base_operations
= {
3402 .read
= generic_read_dir
,
3403 .iterate_shared
= proc_tid_base_readdir
,
3404 .llseek
= generic_file_llseek
,
3407 static const struct inode_operations proc_tid_base_inode_operations
= {
3408 .lookup
= proc_tid_base_lookup
,
3409 .getattr
= pid_getattr
,
3410 .setattr
= proc_setattr
,
3413 static struct dentry
*proc_task_instantiate(struct dentry
*dentry
,
3414 struct task_struct
*task
, const void *ptr
)
3416 struct inode
*inode
;
3417 inode
= proc_pid_make_inode(dentry
->d_sb
, task
, S_IFDIR
| S_IRUGO
| S_IXUGO
);
3419 return ERR_PTR(-ENOENT
);
3421 inode
->i_op
= &proc_tid_base_inode_operations
;
3422 inode
->i_fop
= &proc_tid_base_operations
;
3423 inode
->i_flags
|= S_IMMUTABLE
;
3425 set_nlink(inode
, nlink_tid
);
3426 pid_update_inode(task
, inode
);
3428 d_set_d_op(dentry
, &pid_dentry_operations
);
3429 return d_splice_alias(inode
, dentry
);
3432 static struct dentry
*proc_task_lookup(struct inode
*dir
, struct dentry
* dentry
, unsigned int flags
)
3434 struct task_struct
*task
;
3435 struct task_struct
*leader
= get_proc_task(dir
);
3437 struct pid_namespace
*ns
;
3438 struct dentry
*result
= ERR_PTR(-ENOENT
);
3443 tid
= name_to_int(&dentry
->d_name
);
3447 ns
= dentry
->d_sb
->s_fs_info
;
3449 task
= find_task_by_pid_ns(tid
, ns
);
3451 get_task_struct(task
);
3455 if (!same_thread_group(leader
, task
))
3458 result
= proc_task_instantiate(dentry
, task
, NULL
);
3460 put_task_struct(task
);
3462 put_task_struct(leader
);
3468 * Find the first tid of a thread group to return to user space.
3470 * Usually this is just the thread group leader, but if the users
3471 * buffer was too small or there was a seek into the middle of the
3472 * directory we have more work todo.
3474 * In the case of a short read we start with find_task_by_pid.
3476 * In the case of a seek we start with the leader and walk nr
3479 static struct task_struct
*first_tid(struct pid
*pid
, int tid
, loff_t f_pos
,
3480 struct pid_namespace
*ns
)
3482 struct task_struct
*pos
, *task
;
3483 unsigned long nr
= f_pos
;
3485 if (nr
!= f_pos
) /* 32bit overflow? */
3489 task
= pid_task(pid
, PIDTYPE_PID
);
3493 /* Attempt to start with the tid of a thread */
3495 pos
= find_task_by_pid_ns(tid
, ns
);
3496 if (pos
&& same_thread_group(pos
, task
))
3500 /* If nr exceeds the number of threads there is nothing todo */
3501 if (nr
>= get_nr_threads(task
))
3504 /* If we haven't found our starting place yet start
3505 * with the leader and walk nr threads forward.
3507 pos
= task
= task
->group_leader
;
3511 } while_each_thread(task
, pos
);
3516 get_task_struct(pos
);
3523 * Find the next thread in the thread list.
3524 * Return NULL if there is an error or no next thread.
3526 * The reference to the input task_struct is released.
3528 static struct task_struct
*next_tid(struct task_struct
*start
)
3530 struct task_struct
*pos
= NULL
;
3532 if (pid_alive(start
)) {
3533 pos
= next_thread(start
);
3534 if (thread_group_leader(pos
))
3537 get_task_struct(pos
);
3540 put_task_struct(start
);
3544 /* for the /proc/TGID/task/ directories */
3545 static int proc_task_readdir(struct file
*file
, struct dir_context
*ctx
)
3547 struct inode
*inode
= file_inode(file
);
3548 struct task_struct
*task
;
3549 struct pid_namespace
*ns
;
3552 if (proc_inode_is_dead(inode
))
3555 if (!dir_emit_dots(file
, ctx
))
3558 /* f_version caches the tgid value that the last readdir call couldn't
3559 * return. lseek aka telldir automagically resets f_version to 0.
3561 ns
= proc_pid_ns(inode
);
3562 tid
= (int)file
->f_version
;
3563 file
->f_version
= 0;
3564 for (task
= first_tid(proc_pid(inode
), tid
, ctx
->pos
- 2, ns
);
3566 task
= next_tid(task
), ctx
->pos
++) {
3569 tid
= task_pid_nr_ns(task
, ns
);
3570 len
= snprintf(name
, sizeof(name
), "%u", tid
);
3571 if (!proc_fill_cache(file
, ctx
, name
, len
,
3572 proc_task_instantiate
, task
, NULL
)) {
3573 /* returning this tgid failed, save it as the first
3574 * pid for the next readir call */
3575 file
->f_version
= (u64
)tid
;
3576 put_task_struct(task
);
3584 static int proc_task_getattr(const struct path
*path
, struct kstat
*stat
,
3585 u32 request_mask
, unsigned int query_flags
)
3587 struct inode
*inode
= d_inode(path
->dentry
);
3588 struct task_struct
*p
= get_proc_task(inode
);
3589 generic_fillattr(inode
, stat
);
3592 stat
->nlink
+= get_nr_threads(p
);
3599 static const struct inode_operations proc_task_inode_operations
= {
3600 .lookup
= proc_task_lookup
,
3601 .getattr
= proc_task_getattr
,
3602 .setattr
= proc_setattr
,
3603 .permission
= proc_pid_permission
,
3606 static const struct file_operations proc_task_operations
= {
3607 .read
= generic_read_dir
,
3608 .iterate_shared
= proc_task_readdir
,
3609 .llseek
= generic_file_llseek
,
3612 void __init
set_proc_pid_nlink(void)
3614 nlink_tid
= pid_entry_nlink(tid_base_stuff
, ARRAY_SIZE(tid_base_stuff
));
3615 nlink_tgid
= pid_entry_nlink(tgid_base_stuff
, ARRAY_SIZE(tgid_base_stuff
));