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
;
410 entries
= kmalloc_array(MAX_STACK_TRACE_DEPTH
, sizeof(*entries
),
415 trace
.nr_entries
= 0;
416 trace
.max_entries
= MAX_STACK_TRACE_DEPTH
;
417 trace
.entries
= entries
;
420 err
= lock_trace(task
);
424 save_stack_trace_tsk(task
, &trace
);
426 for (i
= 0; i
< trace
.nr_entries
; i
++) {
427 seq_printf(m
, "[<0>] %pB\n", (void *)entries
[i
]);
437 #ifdef CONFIG_SCHED_INFO
439 * Provides /proc/PID/schedstat
441 static int proc_pid_schedstat(struct seq_file
*m
, struct pid_namespace
*ns
,
442 struct pid
*pid
, struct task_struct
*task
)
444 if (unlikely(!sched_info_on()))
445 seq_printf(m
, "0 0 0\n");
447 seq_printf(m
, "%llu %llu %lu\n",
448 (unsigned long long)task
->se
.sum_exec_runtime
,
449 (unsigned long long)task
->sched_info
.run_delay
,
450 task
->sched_info
.pcount
);
456 #ifdef CONFIG_LATENCYTOP
457 static int lstats_show_proc(struct seq_file
*m
, void *v
)
460 struct inode
*inode
= m
->private;
461 struct task_struct
*task
= get_proc_task(inode
);
465 seq_puts(m
, "Latency Top version : v0.1\n");
466 for (i
= 0; i
< LT_SAVECOUNT
; i
++) {
467 struct latency_record
*lr
= &task
->latency_record
[i
];
468 if (lr
->backtrace
[0]) {
470 seq_printf(m
, "%i %li %li",
471 lr
->count
, lr
->time
, lr
->max
);
472 for (q
= 0; q
< LT_BACKTRACEDEPTH
; q
++) {
473 unsigned long bt
= lr
->backtrace
[q
];
478 seq_printf(m
, " %ps", (void *)bt
);
484 put_task_struct(task
);
488 static int lstats_open(struct inode
*inode
, struct file
*file
)
490 return single_open(file
, lstats_show_proc
, inode
);
493 static ssize_t
lstats_write(struct file
*file
, const char __user
*buf
,
494 size_t count
, loff_t
*offs
)
496 struct task_struct
*task
= get_proc_task(file_inode(file
));
500 clear_all_latency_tracing(task
);
501 put_task_struct(task
);
506 static const struct file_operations proc_lstats_operations
= {
509 .write
= lstats_write
,
511 .release
= single_release
,
516 static int proc_oom_score(struct seq_file
*m
, struct pid_namespace
*ns
,
517 struct pid
*pid
, struct task_struct
*task
)
519 unsigned long totalpages
= totalram_pages
+ total_swap_pages
;
520 unsigned long points
= 0;
522 points
= oom_badness(task
, NULL
, NULL
, totalpages
) *
524 seq_printf(m
, "%lu\n", points
);
534 static const struct limit_names lnames
[RLIM_NLIMITS
] = {
535 [RLIMIT_CPU
] = {"Max cpu time", "seconds"},
536 [RLIMIT_FSIZE
] = {"Max file size", "bytes"},
537 [RLIMIT_DATA
] = {"Max data size", "bytes"},
538 [RLIMIT_STACK
] = {"Max stack size", "bytes"},
539 [RLIMIT_CORE
] = {"Max core file size", "bytes"},
540 [RLIMIT_RSS
] = {"Max resident set", "bytes"},
541 [RLIMIT_NPROC
] = {"Max processes", "processes"},
542 [RLIMIT_NOFILE
] = {"Max open files", "files"},
543 [RLIMIT_MEMLOCK
] = {"Max locked memory", "bytes"},
544 [RLIMIT_AS
] = {"Max address space", "bytes"},
545 [RLIMIT_LOCKS
] = {"Max file locks", "locks"},
546 [RLIMIT_SIGPENDING
] = {"Max pending signals", "signals"},
547 [RLIMIT_MSGQUEUE
] = {"Max msgqueue size", "bytes"},
548 [RLIMIT_NICE
] = {"Max nice priority", NULL
},
549 [RLIMIT_RTPRIO
] = {"Max realtime priority", NULL
},
550 [RLIMIT_RTTIME
] = {"Max realtime timeout", "us"},
553 /* Display limits for a process */
554 static int proc_pid_limits(struct seq_file
*m
, struct pid_namespace
*ns
,
555 struct pid
*pid
, struct task_struct
*task
)
560 struct rlimit rlim
[RLIM_NLIMITS
];
562 if (!lock_task_sighand(task
, &flags
))
564 memcpy(rlim
, task
->signal
->rlim
, sizeof(struct rlimit
) * RLIM_NLIMITS
);
565 unlock_task_sighand(task
, &flags
);
568 * print the file header
570 seq_printf(m
, "%-25s %-20s %-20s %-10s\n",
571 "Limit", "Soft Limit", "Hard Limit", "Units");
573 for (i
= 0; i
< RLIM_NLIMITS
; i
++) {
574 if (rlim
[i
].rlim_cur
== RLIM_INFINITY
)
575 seq_printf(m
, "%-25s %-20s ",
576 lnames
[i
].name
, "unlimited");
578 seq_printf(m
, "%-25s %-20lu ",
579 lnames
[i
].name
, rlim
[i
].rlim_cur
);
581 if (rlim
[i
].rlim_max
== RLIM_INFINITY
)
582 seq_printf(m
, "%-20s ", "unlimited");
584 seq_printf(m
, "%-20lu ", rlim
[i
].rlim_max
);
587 seq_printf(m
, "%-10s\n", lnames
[i
].unit
);
595 #ifdef CONFIG_HAVE_ARCH_TRACEHOOK
596 static int proc_pid_syscall(struct seq_file
*m
, struct pid_namespace
*ns
,
597 struct pid
*pid
, struct task_struct
*task
)
600 unsigned long args
[6], sp
, pc
;
603 res
= lock_trace(task
);
607 if (task_current_syscall(task
, &nr
, args
, 6, &sp
, &pc
))
608 seq_puts(m
, "running\n");
610 seq_printf(m
, "%ld 0x%lx 0x%lx\n", nr
, sp
, pc
);
613 "%ld 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx\n",
615 args
[0], args
[1], args
[2], args
[3], args
[4], args
[5],
621 #endif /* CONFIG_HAVE_ARCH_TRACEHOOK */
623 /************************************************************************/
624 /* Here the fs part begins */
625 /************************************************************************/
627 /* permission checks */
628 static int proc_fd_access_allowed(struct inode
*inode
)
630 struct task_struct
*task
;
632 /* Allow access to a task's file descriptors if it is us or we
633 * may use ptrace attach to the process and find out that
636 task
= get_proc_task(inode
);
638 allowed
= ptrace_may_access(task
, PTRACE_MODE_READ_FSCREDS
);
639 put_task_struct(task
);
644 int proc_setattr(struct dentry
*dentry
, struct iattr
*attr
)
647 struct inode
*inode
= d_inode(dentry
);
649 if (attr
->ia_valid
& ATTR_MODE
)
652 error
= setattr_prepare(dentry
, attr
);
656 setattr_copy(inode
, attr
);
657 mark_inode_dirty(inode
);
662 * May current process learn task's sched/cmdline info (for hide_pid_min=1)
663 * or euid/egid (for hide_pid_min=2)?
665 static bool has_pid_permissions(struct pid_namespace
*pid
,
666 struct task_struct
*task
,
669 if (pid
->hide_pid
< hide_pid_min
)
671 if (in_group_p(pid
->pid_gid
))
673 return ptrace_may_access(task
, PTRACE_MODE_READ_FSCREDS
);
677 static int proc_pid_permission(struct inode
*inode
, int mask
)
679 struct pid_namespace
*pid
= proc_pid_ns(inode
);
680 struct task_struct
*task
;
683 task
= get_proc_task(inode
);
686 has_perms
= has_pid_permissions(pid
, task
, HIDEPID_NO_ACCESS
);
687 put_task_struct(task
);
690 if (pid
->hide_pid
== HIDEPID_INVISIBLE
) {
692 * Let's make getdents(), stat(), and open()
693 * consistent with each other. If a process
694 * may not stat() a file, it shouldn't be seen
702 return generic_permission(inode
, mask
);
707 static const struct inode_operations proc_def_inode_operations
= {
708 .setattr
= proc_setattr
,
711 static int proc_single_show(struct seq_file
*m
, void *v
)
713 struct inode
*inode
= m
->private;
714 struct pid_namespace
*ns
= proc_pid_ns(inode
);
715 struct pid
*pid
= proc_pid(inode
);
716 struct task_struct
*task
;
719 task
= get_pid_task(pid
, PIDTYPE_PID
);
723 ret
= PROC_I(inode
)->op
.proc_show(m
, ns
, pid
, task
);
725 put_task_struct(task
);
729 static int proc_single_open(struct inode
*inode
, struct file
*filp
)
731 return single_open(filp
, proc_single_show
, inode
);
734 static const struct file_operations proc_single_file_operations
= {
735 .open
= proc_single_open
,
738 .release
= single_release
,
742 struct mm_struct
*proc_mem_open(struct inode
*inode
, unsigned int mode
)
744 struct task_struct
*task
= get_proc_task(inode
);
745 struct mm_struct
*mm
= ERR_PTR(-ESRCH
);
748 mm
= mm_access(task
, mode
| PTRACE_MODE_FSCREDS
);
749 put_task_struct(task
);
751 if (!IS_ERR_OR_NULL(mm
)) {
752 /* ensure this mm_struct can't be freed */
754 /* but do not pin its memory */
762 static int __mem_open(struct inode
*inode
, struct file
*file
, unsigned int mode
)
764 struct mm_struct
*mm
= proc_mem_open(inode
, mode
);
769 file
->private_data
= mm
;
773 static int mem_open(struct inode
*inode
, struct file
*file
)
775 int ret
= __mem_open(inode
, file
, PTRACE_MODE_ATTACH
);
777 /* OK to pass negative loff_t, we can catch out-of-range */
778 file
->f_mode
|= FMODE_UNSIGNED_OFFSET
;
783 static ssize_t
mem_rw(struct file
*file
, char __user
*buf
,
784 size_t count
, loff_t
*ppos
, int write
)
786 struct mm_struct
*mm
= file
->private_data
;
787 unsigned long addr
= *ppos
;
795 page
= (char *)__get_free_page(GFP_KERNEL
);
800 if (!mmget_not_zero(mm
))
803 flags
= FOLL_FORCE
| (write
? FOLL_WRITE
: 0);
806 int this_len
= min_t(int, count
, PAGE_SIZE
);
808 if (write
&& copy_from_user(page
, buf
, this_len
)) {
813 this_len
= access_remote_vm(mm
, addr
, page
, this_len
, flags
);
820 if (!write
&& copy_to_user(buf
, page
, this_len
)) {
834 free_page((unsigned long) page
);
838 static ssize_t
mem_read(struct file
*file
, char __user
*buf
,
839 size_t count
, loff_t
*ppos
)
841 return mem_rw(file
, buf
, count
, ppos
, 0);
844 static ssize_t
mem_write(struct file
*file
, const char __user
*buf
,
845 size_t count
, loff_t
*ppos
)
847 return mem_rw(file
, (char __user
*)buf
, count
, ppos
, 1);
850 loff_t
mem_lseek(struct file
*file
, loff_t offset
, int orig
)
854 file
->f_pos
= offset
;
857 file
->f_pos
+= offset
;
862 force_successful_syscall_return();
866 static int mem_release(struct inode
*inode
, struct file
*file
)
868 struct mm_struct
*mm
= file
->private_data
;
874 static const struct file_operations proc_mem_operations
= {
879 .release
= mem_release
,
882 static int environ_open(struct inode
*inode
, struct file
*file
)
884 return __mem_open(inode
, file
, PTRACE_MODE_READ
);
887 static ssize_t
environ_read(struct file
*file
, char __user
*buf
,
888 size_t count
, loff_t
*ppos
)
891 unsigned long src
= *ppos
;
893 struct mm_struct
*mm
= file
->private_data
;
894 unsigned long env_start
, env_end
;
896 /* Ensure the process spawned far enough to have an environment. */
897 if (!mm
|| !mm
->env_end
)
900 page
= (char *)__get_free_page(GFP_KERNEL
);
905 if (!mmget_not_zero(mm
))
908 spin_lock(&mm
->arg_lock
);
909 env_start
= mm
->env_start
;
910 env_end
= mm
->env_end
;
911 spin_unlock(&mm
->arg_lock
);
914 size_t this_len
, max_len
;
917 if (src
>= (env_end
- env_start
))
920 this_len
= env_end
- (env_start
+ src
);
922 max_len
= min_t(size_t, PAGE_SIZE
, count
);
923 this_len
= min(max_len
, this_len
);
925 retval
= access_remote_vm(mm
, (env_start
+ src
), page
, this_len
, FOLL_ANON
);
932 if (copy_to_user(buf
, page
, retval
)) {
946 free_page((unsigned long) page
);
950 static const struct file_operations proc_environ_operations
= {
951 .open
= environ_open
,
952 .read
= environ_read
,
953 .llseek
= generic_file_llseek
,
954 .release
= mem_release
,
957 static int auxv_open(struct inode
*inode
, struct file
*file
)
959 return __mem_open(inode
, file
, PTRACE_MODE_READ_FSCREDS
);
962 static ssize_t
auxv_read(struct file
*file
, char __user
*buf
,
963 size_t count
, loff_t
*ppos
)
965 struct mm_struct
*mm
= file
->private_data
;
966 unsigned int nwords
= 0;
972 } while (mm
->saved_auxv
[nwords
- 2] != 0); /* AT_NULL */
973 return simple_read_from_buffer(buf
, count
, ppos
, mm
->saved_auxv
,
974 nwords
* sizeof(mm
->saved_auxv
[0]));
977 static const struct file_operations proc_auxv_operations
= {
980 .llseek
= generic_file_llseek
,
981 .release
= mem_release
,
984 static ssize_t
oom_adj_read(struct file
*file
, char __user
*buf
, size_t count
,
987 struct task_struct
*task
= get_proc_task(file_inode(file
));
988 char buffer
[PROC_NUMBUF
];
989 int oom_adj
= OOM_ADJUST_MIN
;
994 if (task
->signal
->oom_score_adj
== OOM_SCORE_ADJ_MAX
)
995 oom_adj
= OOM_ADJUST_MAX
;
997 oom_adj
= (task
->signal
->oom_score_adj
* -OOM_DISABLE
) /
999 put_task_struct(task
);
1000 len
= snprintf(buffer
, sizeof(buffer
), "%d\n", oom_adj
);
1001 return simple_read_from_buffer(buf
, count
, ppos
, buffer
, len
);
1004 static int __set_oom_adj(struct file
*file
, int oom_adj
, bool legacy
)
1006 static DEFINE_MUTEX(oom_adj_mutex
);
1007 struct mm_struct
*mm
= NULL
;
1008 struct task_struct
*task
;
1011 task
= get_proc_task(file_inode(file
));
1015 mutex_lock(&oom_adj_mutex
);
1017 if (oom_adj
< task
->signal
->oom_score_adj
&&
1018 !capable(CAP_SYS_RESOURCE
)) {
1023 * /proc/pid/oom_adj is provided for legacy purposes, ask users to use
1024 * /proc/pid/oom_score_adj instead.
1026 pr_warn_once("%s (%d): /proc/%d/oom_adj is deprecated, please use /proc/%d/oom_score_adj instead.\n",
1027 current
->comm
, task_pid_nr(current
), task_pid_nr(task
),
1030 if ((short)oom_adj
< task
->signal
->oom_score_adj_min
&&
1031 !capable(CAP_SYS_RESOURCE
)) {
1038 * Make sure we will check other processes sharing the mm if this is
1039 * not vfrok which wants its own oom_score_adj.
1040 * pin the mm so it doesn't go away and get reused after task_unlock
1042 if (!task
->vfork_done
) {
1043 struct task_struct
*p
= find_lock_task_mm(task
);
1046 if (atomic_read(&p
->mm
->mm_users
) > 1) {
1054 task
->signal
->oom_score_adj
= oom_adj
;
1055 if (!legacy
&& has_capability_noaudit(current
, CAP_SYS_RESOURCE
))
1056 task
->signal
->oom_score_adj_min
= (short)oom_adj
;
1057 trace_oom_score_adj_update(task
);
1060 struct task_struct
*p
;
1063 for_each_process(p
) {
1064 if (same_thread_group(task
, p
))
1067 /* do not touch kernel threads or the global init */
1068 if (p
->flags
& PF_KTHREAD
|| is_global_init(p
))
1072 if (!p
->vfork_done
&& process_shares_mm(p
, mm
)) {
1073 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",
1074 task_pid_nr(p
), p
->comm
,
1075 p
->signal
->oom_score_adj
, oom_adj
,
1076 task_pid_nr(task
), task
->comm
);
1077 p
->signal
->oom_score_adj
= oom_adj
;
1078 if (!legacy
&& has_capability_noaudit(current
, CAP_SYS_RESOURCE
))
1079 p
->signal
->oom_score_adj_min
= (short)oom_adj
;
1087 mutex_unlock(&oom_adj_mutex
);
1088 put_task_struct(task
);
1093 * /proc/pid/oom_adj exists solely for backwards compatibility with previous
1094 * kernels. The effective policy is defined by oom_score_adj, which has a
1095 * different scale: oom_adj grew exponentially and oom_score_adj grows linearly.
1096 * Values written to oom_adj are simply mapped linearly to oom_score_adj.
1097 * Processes that become oom disabled via oom_adj will still be oom disabled
1098 * with this implementation.
1100 * oom_adj cannot be removed since existing userspace binaries use it.
1102 static ssize_t
oom_adj_write(struct file
*file
, const char __user
*buf
,
1103 size_t count
, loff_t
*ppos
)
1105 char buffer
[PROC_NUMBUF
];
1109 memset(buffer
, 0, sizeof(buffer
));
1110 if (count
> sizeof(buffer
) - 1)
1111 count
= sizeof(buffer
) - 1;
1112 if (copy_from_user(buffer
, buf
, count
)) {
1117 err
= kstrtoint(strstrip(buffer
), 0, &oom_adj
);
1120 if ((oom_adj
< OOM_ADJUST_MIN
|| oom_adj
> OOM_ADJUST_MAX
) &&
1121 oom_adj
!= OOM_DISABLE
) {
1127 * Scale /proc/pid/oom_score_adj appropriately ensuring that a maximum
1128 * value is always attainable.
1130 if (oom_adj
== OOM_ADJUST_MAX
)
1131 oom_adj
= OOM_SCORE_ADJ_MAX
;
1133 oom_adj
= (oom_adj
* OOM_SCORE_ADJ_MAX
) / -OOM_DISABLE
;
1135 err
= __set_oom_adj(file
, oom_adj
, true);
1137 return err
< 0 ? err
: count
;
1140 static const struct file_operations proc_oom_adj_operations
= {
1141 .read
= oom_adj_read
,
1142 .write
= oom_adj_write
,
1143 .llseek
= generic_file_llseek
,
1146 static ssize_t
oom_score_adj_read(struct file
*file
, char __user
*buf
,
1147 size_t count
, loff_t
*ppos
)
1149 struct task_struct
*task
= get_proc_task(file_inode(file
));
1150 char buffer
[PROC_NUMBUF
];
1151 short oom_score_adj
= OOM_SCORE_ADJ_MIN
;
1156 oom_score_adj
= task
->signal
->oom_score_adj
;
1157 put_task_struct(task
);
1158 len
= snprintf(buffer
, sizeof(buffer
), "%hd\n", oom_score_adj
);
1159 return simple_read_from_buffer(buf
, count
, ppos
, buffer
, len
);
1162 static ssize_t
oom_score_adj_write(struct file
*file
, const char __user
*buf
,
1163 size_t count
, loff_t
*ppos
)
1165 char buffer
[PROC_NUMBUF
];
1169 memset(buffer
, 0, sizeof(buffer
));
1170 if (count
> sizeof(buffer
) - 1)
1171 count
= sizeof(buffer
) - 1;
1172 if (copy_from_user(buffer
, buf
, count
)) {
1177 err
= kstrtoint(strstrip(buffer
), 0, &oom_score_adj
);
1180 if (oom_score_adj
< OOM_SCORE_ADJ_MIN
||
1181 oom_score_adj
> OOM_SCORE_ADJ_MAX
) {
1186 err
= __set_oom_adj(file
, oom_score_adj
, false);
1188 return err
< 0 ? err
: count
;
1191 static const struct file_operations proc_oom_score_adj_operations
= {
1192 .read
= oom_score_adj_read
,
1193 .write
= oom_score_adj_write
,
1194 .llseek
= default_llseek
,
1197 #ifdef CONFIG_AUDITSYSCALL
1198 #define TMPBUFLEN 11
1199 static ssize_t
proc_loginuid_read(struct file
* file
, char __user
* buf
,
1200 size_t count
, loff_t
*ppos
)
1202 struct inode
* inode
= file_inode(file
);
1203 struct task_struct
*task
= get_proc_task(inode
);
1205 char tmpbuf
[TMPBUFLEN
];
1209 length
= scnprintf(tmpbuf
, TMPBUFLEN
, "%u",
1210 from_kuid(file
->f_cred
->user_ns
,
1211 audit_get_loginuid(task
)));
1212 put_task_struct(task
);
1213 return simple_read_from_buffer(buf
, count
, ppos
, tmpbuf
, length
);
1216 static ssize_t
proc_loginuid_write(struct file
* file
, const char __user
* buf
,
1217 size_t count
, loff_t
*ppos
)
1219 struct inode
* inode
= file_inode(file
);
1225 if (current
!= pid_task(proc_pid(inode
), PIDTYPE_PID
)) {
1232 /* No partial writes. */
1236 rv
= kstrtou32_from_user(buf
, count
, 10, &loginuid
);
1240 /* is userspace tring to explicitly UNSET the loginuid? */
1241 if (loginuid
== AUDIT_UID_UNSET
) {
1242 kloginuid
= INVALID_UID
;
1244 kloginuid
= make_kuid(file
->f_cred
->user_ns
, loginuid
);
1245 if (!uid_valid(kloginuid
))
1249 rv
= audit_set_loginuid(kloginuid
);
1255 static const struct file_operations proc_loginuid_operations
= {
1256 .read
= proc_loginuid_read
,
1257 .write
= proc_loginuid_write
,
1258 .llseek
= generic_file_llseek
,
1261 static ssize_t
proc_sessionid_read(struct file
* file
, char __user
* buf
,
1262 size_t count
, loff_t
*ppos
)
1264 struct inode
* inode
= file_inode(file
);
1265 struct task_struct
*task
= get_proc_task(inode
);
1267 char tmpbuf
[TMPBUFLEN
];
1271 length
= scnprintf(tmpbuf
, TMPBUFLEN
, "%u",
1272 audit_get_sessionid(task
));
1273 put_task_struct(task
);
1274 return simple_read_from_buffer(buf
, count
, ppos
, tmpbuf
, length
);
1277 static const struct file_operations proc_sessionid_operations
= {
1278 .read
= proc_sessionid_read
,
1279 .llseek
= generic_file_llseek
,
1283 #ifdef CONFIG_FAULT_INJECTION
1284 static ssize_t
proc_fault_inject_read(struct file
* file
, char __user
* buf
,
1285 size_t count
, loff_t
*ppos
)
1287 struct task_struct
*task
= get_proc_task(file_inode(file
));
1288 char buffer
[PROC_NUMBUF
];
1294 make_it_fail
= task
->make_it_fail
;
1295 put_task_struct(task
);
1297 len
= snprintf(buffer
, sizeof(buffer
), "%i\n", make_it_fail
);
1299 return simple_read_from_buffer(buf
, count
, ppos
, buffer
, len
);
1302 static ssize_t
proc_fault_inject_write(struct file
* file
,
1303 const char __user
* buf
, size_t count
, loff_t
*ppos
)
1305 struct task_struct
*task
;
1306 char buffer
[PROC_NUMBUF
];
1310 if (!capable(CAP_SYS_RESOURCE
))
1312 memset(buffer
, 0, sizeof(buffer
));
1313 if (count
> sizeof(buffer
) - 1)
1314 count
= sizeof(buffer
) - 1;
1315 if (copy_from_user(buffer
, buf
, count
))
1317 rv
= kstrtoint(strstrip(buffer
), 0, &make_it_fail
);
1320 if (make_it_fail
< 0 || make_it_fail
> 1)
1323 task
= get_proc_task(file_inode(file
));
1326 task
->make_it_fail
= make_it_fail
;
1327 put_task_struct(task
);
1332 static const struct file_operations proc_fault_inject_operations
= {
1333 .read
= proc_fault_inject_read
,
1334 .write
= proc_fault_inject_write
,
1335 .llseek
= generic_file_llseek
,
1338 static ssize_t
proc_fail_nth_write(struct file
*file
, const char __user
*buf
,
1339 size_t count
, loff_t
*ppos
)
1341 struct task_struct
*task
;
1345 err
= kstrtouint_from_user(buf
, count
, 0, &n
);
1349 task
= get_proc_task(file_inode(file
));
1353 put_task_struct(task
);
1358 static ssize_t
proc_fail_nth_read(struct file
*file
, char __user
*buf
,
1359 size_t count
, loff_t
*ppos
)
1361 struct task_struct
*task
;
1362 char numbuf
[PROC_NUMBUF
];
1365 task
= get_proc_task(file_inode(file
));
1368 len
= snprintf(numbuf
, sizeof(numbuf
), "%u\n", task
->fail_nth
);
1369 put_task_struct(task
);
1370 return simple_read_from_buffer(buf
, count
, ppos
, numbuf
, len
);
1373 static const struct file_operations proc_fail_nth_operations
= {
1374 .read
= proc_fail_nth_read
,
1375 .write
= proc_fail_nth_write
,
1380 #ifdef CONFIG_SCHED_DEBUG
1382 * Print out various scheduling related per-task fields:
1384 static int sched_show(struct seq_file
*m
, void *v
)
1386 struct inode
*inode
= m
->private;
1387 struct pid_namespace
*ns
= proc_pid_ns(inode
);
1388 struct task_struct
*p
;
1390 p
= get_proc_task(inode
);
1393 proc_sched_show_task(p
, ns
, m
);
1401 sched_write(struct file
*file
, const char __user
*buf
,
1402 size_t count
, loff_t
*offset
)
1404 struct inode
*inode
= file_inode(file
);
1405 struct task_struct
*p
;
1407 p
= get_proc_task(inode
);
1410 proc_sched_set_task(p
);
1417 static int sched_open(struct inode
*inode
, struct file
*filp
)
1419 return single_open(filp
, sched_show
, inode
);
1422 static const struct file_operations proc_pid_sched_operations
= {
1425 .write
= sched_write
,
1426 .llseek
= seq_lseek
,
1427 .release
= single_release
,
1432 #ifdef CONFIG_SCHED_AUTOGROUP
1434 * Print out autogroup related information:
1436 static int sched_autogroup_show(struct seq_file
*m
, void *v
)
1438 struct inode
*inode
= m
->private;
1439 struct task_struct
*p
;
1441 p
= get_proc_task(inode
);
1444 proc_sched_autogroup_show_task(p
, m
);
1452 sched_autogroup_write(struct file
*file
, const char __user
*buf
,
1453 size_t count
, loff_t
*offset
)
1455 struct inode
*inode
= file_inode(file
);
1456 struct task_struct
*p
;
1457 char buffer
[PROC_NUMBUF
];
1461 memset(buffer
, 0, sizeof(buffer
));
1462 if (count
> sizeof(buffer
) - 1)
1463 count
= sizeof(buffer
) - 1;
1464 if (copy_from_user(buffer
, buf
, count
))
1467 err
= kstrtoint(strstrip(buffer
), 0, &nice
);
1471 p
= get_proc_task(inode
);
1475 err
= proc_sched_autogroup_set_nice(p
, nice
);
1484 static int sched_autogroup_open(struct inode
*inode
, struct file
*filp
)
1488 ret
= single_open(filp
, sched_autogroup_show
, NULL
);
1490 struct seq_file
*m
= filp
->private_data
;
1497 static const struct file_operations proc_pid_sched_autogroup_operations
= {
1498 .open
= sched_autogroup_open
,
1500 .write
= sched_autogroup_write
,
1501 .llseek
= seq_lseek
,
1502 .release
= single_release
,
1505 #endif /* CONFIG_SCHED_AUTOGROUP */
1507 static ssize_t
comm_write(struct file
*file
, const char __user
*buf
,
1508 size_t count
, loff_t
*offset
)
1510 struct inode
*inode
= file_inode(file
);
1511 struct task_struct
*p
;
1512 char buffer
[TASK_COMM_LEN
];
1513 const size_t maxlen
= sizeof(buffer
) - 1;
1515 memset(buffer
, 0, sizeof(buffer
));
1516 if (copy_from_user(buffer
, buf
, count
> maxlen
? maxlen
: count
))
1519 p
= get_proc_task(inode
);
1523 if (same_thread_group(current
, p
))
1524 set_task_comm(p
, buffer
);
1533 static int comm_show(struct seq_file
*m
, void *v
)
1535 struct inode
*inode
= m
->private;
1536 struct task_struct
*p
;
1538 p
= get_proc_task(inode
);
1542 proc_task_name(m
, p
, false);
1550 static int comm_open(struct inode
*inode
, struct file
*filp
)
1552 return single_open(filp
, comm_show
, inode
);
1555 static const struct file_operations proc_pid_set_comm_operations
= {
1558 .write
= comm_write
,
1559 .llseek
= seq_lseek
,
1560 .release
= single_release
,
1563 static int proc_exe_link(struct dentry
*dentry
, struct path
*exe_path
)
1565 struct task_struct
*task
;
1566 struct file
*exe_file
;
1568 task
= get_proc_task(d_inode(dentry
));
1571 exe_file
= get_task_exe_file(task
);
1572 put_task_struct(task
);
1574 *exe_path
= exe_file
->f_path
;
1575 path_get(&exe_file
->f_path
);
1582 static const char *proc_pid_get_link(struct dentry
*dentry
,
1583 struct inode
*inode
,
1584 struct delayed_call
*done
)
1587 int error
= -EACCES
;
1590 return ERR_PTR(-ECHILD
);
1592 /* Are we allowed to snoop on the tasks file descriptors? */
1593 if (!proc_fd_access_allowed(inode
))
1596 error
= PROC_I(inode
)->op
.proc_get_link(dentry
, &path
);
1600 nd_jump_link(&path
);
1603 return ERR_PTR(error
);
1606 static int do_proc_readlink(struct path
*path
, char __user
*buffer
, int buflen
)
1608 char *tmp
= (char *)__get_free_page(GFP_KERNEL
);
1615 pathname
= d_path(path
, tmp
, PAGE_SIZE
);
1616 len
= PTR_ERR(pathname
);
1617 if (IS_ERR(pathname
))
1619 len
= tmp
+ PAGE_SIZE
- 1 - pathname
;
1623 if (copy_to_user(buffer
, pathname
, len
))
1626 free_page((unsigned long)tmp
);
1630 static int proc_pid_readlink(struct dentry
* dentry
, char __user
* buffer
, int buflen
)
1632 int error
= -EACCES
;
1633 struct inode
*inode
= d_inode(dentry
);
1636 /* Are we allowed to snoop on the tasks file descriptors? */
1637 if (!proc_fd_access_allowed(inode
))
1640 error
= PROC_I(inode
)->op
.proc_get_link(dentry
, &path
);
1644 error
= do_proc_readlink(&path
, buffer
, buflen
);
1650 const struct inode_operations proc_pid_link_inode_operations
= {
1651 .readlink
= proc_pid_readlink
,
1652 .get_link
= proc_pid_get_link
,
1653 .setattr
= proc_setattr
,
1657 /* building an inode */
1659 void task_dump_owner(struct task_struct
*task
, umode_t mode
,
1660 kuid_t
*ruid
, kgid_t
*rgid
)
1662 /* Depending on the state of dumpable compute who should own a
1663 * proc file for a task.
1665 const struct cred
*cred
;
1669 if (unlikely(task
->flags
& PF_KTHREAD
)) {
1670 *ruid
= GLOBAL_ROOT_UID
;
1671 *rgid
= GLOBAL_ROOT_GID
;
1675 /* Default to the tasks effective ownership */
1677 cred
= __task_cred(task
);
1683 * Before the /proc/pid/status file was created the only way to read
1684 * the effective uid of a /process was to stat /proc/pid. Reading
1685 * /proc/pid/status is slow enough that procps and other packages
1686 * kept stating /proc/pid. To keep the rules in /proc simple I have
1687 * made this apply to all per process world readable and executable
1690 if (mode
!= (S_IFDIR
|S_IRUGO
|S_IXUGO
)) {
1691 struct mm_struct
*mm
;
1694 /* Make non-dumpable tasks owned by some root */
1696 if (get_dumpable(mm
) != SUID_DUMP_USER
) {
1697 struct user_namespace
*user_ns
= mm
->user_ns
;
1699 uid
= make_kuid(user_ns
, 0);
1700 if (!uid_valid(uid
))
1701 uid
= GLOBAL_ROOT_UID
;
1703 gid
= make_kgid(user_ns
, 0);
1704 if (!gid_valid(gid
))
1705 gid
= GLOBAL_ROOT_GID
;
1708 uid
= GLOBAL_ROOT_UID
;
1709 gid
= GLOBAL_ROOT_GID
;
1717 struct inode
*proc_pid_make_inode(struct super_block
* sb
,
1718 struct task_struct
*task
, umode_t mode
)
1720 struct inode
* inode
;
1721 struct proc_inode
*ei
;
1723 /* We need a new inode */
1725 inode
= new_inode(sb
);
1731 inode
->i_mode
= mode
;
1732 inode
->i_ino
= get_next_ino();
1733 inode
->i_mtime
= inode
->i_atime
= inode
->i_ctime
= current_time(inode
);
1734 inode
->i_op
= &proc_def_inode_operations
;
1737 * grab the reference to task.
1739 ei
->pid
= get_task_pid(task
, PIDTYPE_PID
);
1743 task_dump_owner(task
, 0, &inode
->i_uid
, &inode
->i_gid
);
1744 security_task_to_inode(task
, inode
);
1754 int pid_getattr(const struct path
*path
, struct kstat
*stat
,
1755 u32 request_mask
, unsigned int query_flags
)
1757 struct inode
*inode
= d_inode(path
->dentry
);
1758 struct pid_namespace
*pid
= proc_pid_ns(inode
);
1759 struct task_struct
*task
;
1761 generic_fillattr(inode
, stat
);
1763 stat
->uid
= GLOBAL_ROOT_UID
;
1764 stat
->gid
= GLOBAL_ROOT_GID
;
1766 task
= pid_task(proc_pid(inode
), PIDTYPE_PID
);
1768 if (!has_pid_permissions(pid
, task
, HIDEPID_INVISIBLE
)) {
1771 * This doesn't prevent learning whether PID exists,
1772 * it only makes getattr() consistent with readdir().
1776 task_dump_owner(task
, inode
->i_mode
, &stat
->uid
, &stat
->gid
);
1785 * Set <pid>/... inode ownership (can change due to setuid(), etc.)
1787 void pid_update_inode(struct task_struct
*task
, struct inode
*inode
)
1789 task_dump_owner(task
, inode
->i_mode
, &inode
->i_uid
, &inode
->i_gid
);
1791 inode
->i_mode
&= ~(S_ISUID
| S_ISGID
);
1792 security_task_to_inode(task
, inode
);
1796 * Rewrite the inode's ownerships here because the owning task may have
1797 * performed a setuid(), etc.
1800 static int pid_revalidate(struct dentry
*dentry
, unsigned int flags
)
1802 struct inode
*inode
;
1803 struct task_struct
*task
;
1805 if (flags
& LOOKUP_RCU
)
1808 inode
= d_inode(dentry
);
1809 task
= get_proc_task(inode
);
1812 pid_update_inode(task
, inode
);
1813 put_task_struct(task
);
1819 static inline bool proc_inode_is_dead(struct inode
*inode
)
1821 return !proc_pid(inode
)->tasks
[PIDTYPE_PID
].first
;
1824 int pid_delete_dentry(const struct dentry
*dentry
)
1826 /* Is the task we represent dead?
1827 * If so, then don't put the dentry on the lru list,
1828 * kill it immediately.
1830 return proc_inode_is_dead(d_inode(dentry
));
1833 const struct dentry_operations pid_dentry_operations
=
1835 .d_revalidate
= pid_revalidate
,
1836 .d_delete
= pid_delete_dentry
,
1842 * Fill a directory entry.
1844 * If possible create the dcache entry and derive our inode number and
1845 * file type from dcache entry.
1847 * Since all of the proc inode numbers are dynamically generated, the inode
1848 * numbers do not exist until the inode is cache. This means creating the
1849 * the dcache entry in readdir is necessary to keep the inode numbers
1850 * reported by readdir in sync with the inode numbers reported
1853 bool proc_fill_cache(struct file
*file
, struct dir_context
*ctx
,
1854 const char *name
, unsigned int len
,
1855 instantiate_t instantiate
, struct task_struct
*task
, const void *ptr
)
1857 struct dentry
*child
, *dir
= file
->f_path
.dentry
;
1858 struct qstr qname
= QSTR_INIT(name
, len
);
1859 struct inode
*inode
;
1860 unsigned type
= DT_UNKNOWN
;
1863 child
= d_hash_and_lookup(dir
, &qname
);
1865 DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq
);
1866 child
= d_alloc_parallel(dir
, &qname
, &wq
);
1868 goto end_instantiate
;
1869 if (d_in_lookup(child
)) {
1871 res
= instantiate(child
, task
, ptr
);
1872 d_lookup_done(child
);
1873 if (unlikely(res
)) {
1877 goto end_instantiate
;
1881 inode
= d_inode(child
);
1883 type
= inode
->i_mode
>> 12;
1886 return dir_emit(ctx
, name
, len
, ino
, type
);
1890 * dname_to_vma_addr - maps a dentry name into two unsigned longs
1891 * which represent vma start and end addresses.
1893 static int dname_to_vma_addr(struct dentry
*dentry
,
1894 unsigned long *start
, unsigned long *end
)
1896 const char *str
= dentry
->d_name
.name
;
1897 unsigned long long sval
, eval
;
1900 if (str
[0] == '0' && str
[1] != '-')
1902 len
= _parse_integer(str
, 16, &sval
);
1903 if (len
& KSTRTOX_OVERFLOW
)
1905 if (sval
!= (unsigned long)sval
)
1913 if (str
[0] == '0' && str
[1])
1915 len
= _parse_integer(str
, 16, &eval
);
1916 if (len
& KSTRTOX_OVERFLOW
)
1918 if (eval
!= (unsigned long)eval
)
1931 static int map_files_d_revalidate(struct dentry
*dentry
, unsigned int flags
)
1933 unsigned long vm_start
, vm_end
;
1934 bool exact_vma_exists
= false;
1935 struct mm_struct
*mm
= NULL
;
1936 struct task_struct
*task
;
1937 struct inode
*inode
;
1940 if (flags
& LOOKUP_RCU
)
1943 inode
= d_inode(dentry
);
1944 task
= get_proc_task(inode
);
1948 mm
= mm_access(task
, PTRACE_MODE_READ_FSCREDS
);
1949 if (IS_ERR_OR_NULL(mm
))
1952 if (!dname_to_vma_addr(dentry
, &vm_start
, &vm_end
)) {
1953 down_read(&mm
->mmap_sem
);
1954 exact_vma_exists
= !!find_exact_vma(mm
, vm_start
, vm_end
);
1955 up_read(&mm
->mmap_sem
);
1960 if (exact_vma_exists
) {
1961 task_dump_owner(task
, 0, &inode
->i_uid
, &inode
->i_gid
);
1963 security_task_to_inode(task
, inode
);
1968 put_task_struct(task
);
1974 static const struct dentry_operations tid_map_files_dentry_operations
= {
1975 .d_revalidate
= map_files_d_revalidate
,
1976 .d_delete
= pid_delete_dentry
,
1979 static int map_files_get_link(struct dentry
*dentry
, struct path
*path
)
1981 unsigned long vm_start
, vm_end
;
1982 struct vm_area_struct
*vma
;
1983 struct task_struct
*task
;
1984 struct mm_struct
*mm
;
1988 task
= get_proc_task(d_inode(dentry
));
1992 mm
= get_task_mm(task
);
1993 put_task_struct(task
);
1997 rc
= dname_to_vma_addr(dentry
, &vm_start
, &vm_end
);
2002 down_read(&mm
->mmap_sem
);
2003 vma
= find_exact_vma(mm
, vm_start
, vm_end
);
2004 if (vma
&& vma
->vm_file
) {
2005 *path
= vma
->vm_file
->f_path
;
2009 up_read(&mm
->mmap_sem
);
2017 struct map_files_info
{
2018 unsigned long start
;
2024 * Only allow CAP_SYS_ADMIN to follow the links, due to concerns about how the
2025 * symlinks may be used to bypass permissions on ancestor directories in the
2026 * path to the file in question.
2029 proc_map_files_get_link(struct dentry
*dentry
,
2030 struct inode
*inode
,
2031 struct delayed_call
*done
)
2033 if (!capable(CAP_SYS_ADMIN
))
2034 return ERR_PTR(-EPERM
);
2036 return proc_pid_get_link(dentry
, inode
, done
);
2040 * Identical to proc_pid_link_inode_operations except for get_link()
2042 static const struct inode_operations proc_map_files_link_inode_operations
= {
2043 .readlink
= proc_pid_readlink
,
2044 .get_link
= proc_map_files_get_link
,
2045 .setattr
= proc_setattr
,
2048 static struct dentry
*
2049 proc_map_files_instantiate(struct dentry
*dentry
,
2050 struct task_struct
*task
, const void *ptr
)
2052 fmode_t mode
= (fmode_t
)(unsigned long)ptr
;
2053 struct proc_inode
*ei
;
2054 struct inode
*inode
;
2056 inode
= proc_pid_make_inode(dentry
->d_sb
, task
, S_IFLNK
|
2057 ((mode
& FMODE_READ
) ? S_IRUSR
: 0) |
2058 ((mode
& FMODE_WRITE
) ? S_IWUSR
: 0));
2060 return ERR_PTR(-ENOENT
);
2063 ei
->op
.proc_get_link
= map_files_get_link
;
2065 inode
->i_op
= &proc_map_files_link_inode_operations
;
2068 d_set_d_op(dentry
, &tid_map_files_dentry_operations
);
2069 return d_splice_alias(inode
, dentry
);
2072 static struct dentry
*proc_map_files_lookup(struct inode
*dir
,
2073 struct dentry
*dentry
, unsigned int flags
)
2075 unsigned long vm_start
, vm_end
;
2076 struct vm_area_struct
*vma
;
2077 struct task_struct
*task
;
2078 struct dentry
*result
;
2079 struct mm_struct
*mm
;
2081 result
= ERR_PTR(-ENOENT
);
2082 task
= get_proc_task(dir
);
2086 result
= ERR_PTR(-EACCES
);
2087 if (!ptrace_may_access(task
, PTRACE_MODE_READ_FSCREDS
))
2090 result
= ERR_PTR(-ENOENT
);
2091 if (dname_to_vma_addr(dentry
, &vm_start
, &vm_end
))
2094 mm
= get_task_mm(task
);
2098 down_read(&mm
->mmap_sem
);
2099 vma
= find_exact_vma(mm
, vm_start
, vm_end
);
2104 result
= proc_map_files_instantiate(dentry
, task
,
2105 (void *)(unsigned long)vma
->vm_file
->f_mode
);
2108 up_read(&mm
->mmap_sem
);
2111 put_task_struct(task
);
2116 static const struct inode_operations proc_map_files_inode_operations
= {
2117 .lookup
= proc_map_files_lookup
,
2118 .permission
= proc_fd_permission
,
2119 .setattr
= proc_setattr
,
2123 proc_map_files_readdir(struct file
*file
, struct dir_context
*ctx
)
2125 struct vm_area_struct
*vma
;
2126 struct task_struct
*task
;
2127 struct mm_struct
*mm
;
2128 unsigned long nr_files
, pos
, i
;
2129 struct flex_array
*fa
= NULL
;
2130 struct map_files_info info
;
2131 struct map_files_info
*p
;
2135 task
= get_proc_task(file_inode(file
));
2140 if (!ptrace_may_access(task
, PTRACE_MODE_READ_FSCREDS
))
2144 if (!dir_emit_dots(file
, ctx
))
2147 mm
= get_task_mm(task
);
2150 down_read(&mm
->mmap_sem
);
2155 * We need two passes here:
2157 * 1) Collect vmas of mapped files with mmap_sem taken
2158 * 2) Release mmap_sem and instantiate entries
2160 * otherwise we get lockdep complained, since filldir()
2161 * routine might require mmap_sem taken in might_fault().
2164 for (vma
= mm
->mmap
, pos
= 2; vma
; vma
= vma
->vm_next
) {
2165 if (vma
->vm_file
&& ++pos
> ctx
->pos
)
2170 fa
= flex_array_alloc(sizeof(info
), nr_files
,
2172 if (!fa
|| flex_array_prealloc(fa
, 0, nr_files
,
2176 flex_array_free(fa
);
2177 up_read(&mm
->mmap_sem
);
2181 for (i
= 0, vma
= mm
->mmap
, pos
= 2; vma
;
2182 vma
= vma
->vm_next
) {
2185 if (++pos
<= ctx
->pos
)
2188 info
.start
= vma
->vm_start
;
2189 info
.end
= vma
->vm_end
;
2190 info
.mode
= vma
->vm_file
->f_mode
;
2191 if (flex_array_put(fa
, i
++, &info
, GFP_KERNEL
))
2195 up_read(&mm
->mmap_sem
);
2198 for (i
= 0; i
< nr_files
; i
++) {
2199 char buf
[4 * sizeof(long) + 2]; /* max: %lx-%lx\0 */
2202 p
= flex_array_get(fa
, i
);
2203 len
= snprintf(buf
, sizeof(buf
), "%lx-%lx", p
->start
, p
->end
);
2204 if (!proc_fill_cache(file
, ctx
,
2206 proc_map_files_instantiate
,
2208 (void *)(unsigned long)p
->mode
))
2213 flex_array_free(fa
);
2216 put_task_struct(task
);
2221 static const struct file_operations proc_map_files_operations
= {
2222 .read
= generic_read_dir
,
2223 .iterate_shared
= proc_map_files_readdir
,
2224 .llseek
= generic_file_llseek
,
2227 #if defined(CONFIG_CHECKPOINT_RESTORE) && defined(CONFIG_POSIX_TIMERS)
2228 struct timers_private
{
2230 struct task_struct
*task
;
2231 struct sighand_struct
*sighand
;
2232 struct pid_namespace
*ns
;
2233 unsigned long flags
;
2236 static void *timers_start(struct seq_file
*m
, loff_t
*pos
)
2238 struct timers_private
*tp
= m
->private;
2240 tp
->task
= get_pid_task(tp
->pid
, PIDTYPE_PID
);
2242 return ERR_PTR(-ESRCH
);
2244 tp
->sighand
= lock_task_sighand(tp
->task
, &tp
->flags
);
2246 return ERR_PTR(-ESRCH
);
2248 return seq_list_start(&tp
->task
->signal
->posix_timers
, *pos
);
2251 static void *timers_next(struct seq_file
*m
, void *v
, loff_t
*pos
)
2253 struct timers_private
*tp
= m
->private;
2254 return seq_list_next(v
, &tp
->task
->signal
->posix_timers
, pos
);
2257 static void timers_stop(struct seq_file
*m
, void *v
)
2259 struct timers_private
*tp
= m
->private;
2262 unlock_task_sighand(tp
->task
, &tp
->flags
);
2267 put_task_struct(tp
->task
);
2272 static int show_timer(struct seq_file
*m
, void *v
)
2274 struct k_itimer
*timer
;
2275 struct timers_private
*tp
= m
->private;
2277 static const char * const nstr
[] = {
2278 [SIGEV_SIGNAL
] = "signal",
2279 [SIGEV_NONE
] = "none",
2280 [SIGEV_THREAD
] = "thread",
2283 timer
= list_entry((struct list_head
*)v
, struct k_itimer
, list
);
2284 notify
= timer
->it_sigev_notify
;
2286 seq_printf(m
, "ID: %d\n", timer
->it_id
);
2287 seq_printf(m
, "signal: %d/%px\n",
2288 timer
->sigq
->info
.si_signo
,
2289 timer
->sigq
->info
.si_value
.sival_ptr
);
2290 seq_printf(m
, "notify: %s/%s.%d\n",
2291 nstr
[notify
& ~SIGEV_THREAD_ID
],
2292 (notify
& SIGEV_THREAD_ID
) ? "tid" : "pid",
2293 pid_nr_ns(timer
->it_pid
, tp
->ns
));
2294 seq_printf(m
, "ClockID: %d\n", timer
->it_clock
);
2299 static const struct seq_operations proc_timers_seq_ops
= {
2300 .start
= timers_start
,
2301 .next
= timers_next
,
2302 .stop
= timers_stop
,
2306 static int proc_timers_open(struct inode
*inode
, struct file
*file
)
2308 struct timers_private
*tp
;
2310 tp
= __seq_open_private(file
, &proc_timers_seq_ops
,
2311 sizeof(struct timers_private
));
2315 tp
->pid
= proc_pid(inode
);
2316 tp
->ns
= proc_pid_ns(inode
);
2320 static const struct file_operations proc_timers_operations
= {
2321 .open
= proc_timers_open
,
2323 .llseek
= seq_lseek
,
2324 .release
= seq_release_private
,
2328 static ssize_t
timerslack_ns_write(struct file
*file
, const char __user
*buf
,
2329 size_t count
, loff_t
*offset
)
2331 struct inode
*inode
= file_inode(file
);
2332 struct task_struct
*p
;
2336 err
= kstrtoull_from_user(buf
, count
, 10, &slack_ns
);
2340 p
= get_proc_task(inode
);
2345 if (!capable(CAP_SYS_NICE
)) {
2350 err
= security_task_setscheduler(p
);
2359 p
->timer_slack_ns
= p
->default_timer_slack_ns
;
2361 p
->timer_slack_ns
= slack_ns
;
2370 static int timerslack_ns_show(struct seq_file
*m
, void *v
)
2372 struct inode
*inode
= m
->private;
2373 struct task_struct
*p
;
2376 p
= get_proc_task(inode
);
2382 if (!capable(CAP_SYS_NICE
)) {
2386 err
= security_task_getscheduler(p
);
2392 seq_printf(m
, "%llu\n", p
->timer_slack_ns
);
2401 static int timerslack_ns_open(struct inode
*inode
, struct file
*filp
)
2403 return single_open(filp
, timerslack_ns_show
, inode
);
2406 static const struct file_operations proc_pid_set_timerslack_ns_operations
= {
2407 .open
= timerslack_ns_open
,
2409 .write
= timerslack_ns_write
,
2410 .llseek
= seq_lseek
,
2411 .release
= single_release
,
2414 static struct dentry
*proc_pident_instantiate(struct dentry
*dentry
,
2415 struct task_struct
*task
, const void *ptr
)
2417 const struct pid_entry
*p
= ptr
;
2418 struct inode
*inode
;
2419 struct proc_inode
*ei
;
2421 inode
= proc_pid_make_inode(dentry
->d_sb
, task
, p
->mode
);
2423 return ERR_PTR(-ENOENT
);
2426 if (S_ISDIR(inode
->i_mode
))
2427 set_nlink(inode
, 2); /* Use getattr to fix if necessary */
2429 inode
->i_op
= p
->iop
;
2431 inode
->i_fop
= p
->fop
;
2433 pid_update_inode(task
, inode
);
2434 d_set_d_op(dentry
, &pid_dentry_operations
);
2435 return d_splice_alias(inode
, dentry
);
2438 static struct dentry
*proc_pident_lookup(struct inode
*dir
,
2439 struct dentry
*dentry
,
2440 const struct pid_entry
*ents
,
2443 struct task_struct
*task
= get_proc_task(dir
);
2444 const struct pid_entry
*p
, *last
;
2445 struct dentry
*res
= ERR_PTR(-ENOENT
);
2451 * Yes, it does not scale. And it should not. Don't add
2452 * new entries into /proc/<tgid>/ without very good reasons.
2454 last
= &ents
[nents
];
2455 for (p
= ents
; p
< last
; p
++) {
2456 if (p
->len
!= dentry
->d_name
.len
)
2458 if (!memcmp(dentry
->d_name
.name
, p
->name
, p
->len
)) {
2459 res
= proc_pident_instantiate(dentry
, task
, p
);
2463 put_task_struct(task
);
2468 static int proc_pident_readdir(struct file
*file
, struct dir_context
*ctx
,
2469 const struct pid_entry
*ents
, unsigned int nents
)
2471 struct task_struct
*task
= get_proc_task(file_inode(file
));
2472 const struct pid_entry
*p
;
2477 if (!dir_emit_dots(file
, ctx
))
2480 if (ctx
->pos
>= nents
+ 2)
2483 for (p
= ents
+ (ctx
->pos
- 2); p
< ents
+ nents
; p
++) {
2484 if (!proc_fill_cache(file
, ctx
, p
->name
, p
->len
,
2485 proc_pident_instantiate
, task
, p
))
2490 put_task_struct(task
);
2494 #ifdef CONFIG_SECURITY
2495 static ssize_t
proc_pid_attr_read(struct file
* file
, char __user
* buf
,
2496 size_t count
, loff_t
*ppos
)
2498 struct inode
* inode
= file_inode(file
);
2501 struct task_struct
*task
= get_proc_task(inode
);
2506 length
= security_getprocattr(task
,
2507 (char*)file
->f_path
.dentry
->d_name
.name
,
2509 put_task_struct(task
);
2511 length
= simple_read_from_buffer(buf
, count
, ppos
, p
, length
);
2516 static ssize_t
proc_pid_attr_write(struct file
* file
, const char __user
* buf
,
2517 size_t count
, loff_t
*ppos
)
2519 struct inode
* inode
= file_inode(file
);
2520 struct task_struct
*task
;
2525 task
= pid_task(proc_pid(inode
), PIDTYPE_PID
);
2530 /* A task may only write its own attributes. */
2531 if (current
!= task
) {
2537 if (count
> PAGE_SIZE
)
2540 /* No partial writes. */
2544 page
= memdup_user(buf
, count
);
2550 /* Guard against adverse ptrace interaction */
2551 rv
= mutex_lock_interruptible(¤t
->signal
->cred_guard_mutex
);
2555 rv
= security_setprocattr(file
->f_path
.dentry
->d_name
.name
, page
, count
);
2556 mutex_unlock(¤t
->signal
->cred_guard_mutex
);
2563 static const struct file_operations proc_pid_attr_operations
= {
2564 .read
= proc_pid_attr_read
,
2565 .write
= proc_pid_attr_write
,
2566 .llseek
= generic_file_llseek
,
2569 static const struct pid_entry attr_dir_stuff
[] = {
2570 REG("current", S_IRUGO
|S_IWUGO
, proc_pid_attr_operations
),
2571 REG("prev", S_IRUGO
, proc_pid_attr_operations
),
2572 REG("exec", S_IRUGO
|S_IWUGO
, proc_pid_attr_operations
),
2573 REG("fscreate", S_IRUGO
|S_IWUGO
, proc_pid_attr_operations
),
2574 REG("keycreate", S_IRUGO
|S_IWUGO
, proc_pid_attr_operations
),
2575 REG("sockcreate", S_IRUGO
|S_IWUGO
, proc_pid_attr_operations
),
2578 static int proc_attr_dir_readdir(struct file
*file
, struct dir_context
*ctx
)
2580 return proc_pident_readdir(file
, ctx
,
2581 attr_dir_stuff
, ARRAY_SIZE(attr_dir_stuff
));
2584 static const struct file_operations proc_attr_dir_operations
= {
2585 .read
= generic_read_dir
,
2586 .iterate_shared
= proc_attr_dir_readdir
,
2587 .llseek
= generic_file_llseek
,
2590 static struct dentry
*proc_attr_dir_lookup(struct inode
*dir
,
2591 struct dentry
*dentry
, unsigned int flags
)
2593 return proc_pident_lookup(dir
, dentry
,
2594 attr_dir_stuff
, ARRAY_SIZE(attr_dir_stuff
));
2597 static const struct inode_operations proc_attr_dir_inode_operations
= {
2598 .lookup
= proc_attr_dir_lookup
,
2599 .getattr
= pid_getattr
,
2600 .setattr
= proc_setattr
,
2605 #ifdef CONFIG_ELF_CORE
2606 static ssize_t
proc_coredump_filter_read(struct file
*file
, char __user
*buf
,
2607 size_t count
, loff_t
*ppos
)
2609 struct task_struct
*task
= get_proc_task(file_inode(file
));
2610 struct mm_struct
*mm
;
2611 char buffer
[PROC_NUMBUF
];
2619 mm
= get_task_mm(task
);
2621 len
= snprintf(buffer
, sizeof(buffer
), "%08lx\n",
2622 ((mm
->flags
& MMF_DUMP_FILTER_MASK
) >>
2623 MMF_DUMP_FILTER_SHIFT
));
2625 ret
= simple_read_from_buffer(buf
, count
, ppos
, buffer
, len
);
2628 put_task_struct(task
);
2633 static ssize_t
proc_coredump_filter_write(struct file
*file
,
2634 const char __user
*buf
,
2638 struct task_struct
*task
;
2639 struct mm_struct
*mm
;
2645 ret
= kstrtouint_from_user(buf
, count
, 0, &val
);
2650 task
= get_proc_task(file_inode(file
));
2654 mm
= get_task_mm(task
);
2659 for (i
= 0, mask
= 1; i
< MMF_DUMP_FILTER_BITS
; i
++, mask
<<= 1) {
2661 set_bit(i
+ MMF_DUMP_FILTER_SHIFT
, &mm
->flags
);
2663 clear_bit(i
+ MMF_DUMP_FILTER_SHIFT
, &mm
->flags
);
2668 put_task_struct(task
);
2675 static const struct file_operations proc_coredump_filter_operations
= {
2676 .read
= proc_coredump_filter_read
,
2677 .write
= proc_coredump_filter_write
,
2678 .llseek
= generic_file_llseek
,
2682 #ifdef CONFIG_TASK_IO_ACCOUNTING
2683 static int do_io_accounting(struct task_struct
*task
, struct seq_file
*m
, int whole
)
2685 struct task_io_accounting acct
= task
->ioac
;
2686 unsigned long flags
;
2689 result
= mutex_lock_killable(&task
->signal
->cred_guard_mutex
);
2693 if (!ptrace_may_access(task
, PTRACE_MODE_READ_FSCREDS
)) {
2698 if (whole
&& lock_task_sighand(task
, &flags
)) {
2699 struct task_struct
*t
= task
;
2701 task_io_accounting_add(&acct
, &task
->signal
->ioac
);
2702 while_each_thread(task
, t
)
2703 task_io_accounting_add(&acct
, &t
->ioac
);
2705 unlock_task_sighand(task
, &flags
);
2712 "read_bytes: %llu\n"
2713 "write_bytes: %llu\n"
2714 "cancelled_write_bytes: %llu\n",
2715 (unsigned long long)acct
.rchar
,
2716 (unsigned long long)acct
.wchar
,
2717 (unsigned long long)acct
.syscr
,
2718 (unsigned long long)acct
.syscw
,
2719 (unsigned long long)acct
.read_bytes
,
2720 (unsigned long long)acct
.write_bytes
,
2721 (unsigned long long)acct
.cancelled_write_bytes
);
2725 mutex_unlock(&task
->signal
->cred_guard_mutex
);
2729 static int proc_tid_io_accounting(struct seq_file
*m
, struct pid_namespace
*ns
,
2730 struct pid
*pid
, struct task_struct
*task
)
2732 return do_io_accounting(task
, m
, 0);
2735 static int proc_tgid_io_accounting(struct seq_file
*m
, struct pid_namespace
*ns
,
2736 struct pid
*pid
, struct task_struct
*task
)
2738 return do_io_accounting(task
, m
, 1);
2740 #endif /* CONFIG_TASK_IO_ACCOUNTING */
2742 #ifdef CONFIG_USER_NS
2743 static int proc_id_map_open(struct inode
*inode
, struct file
*file
,
2744 const struct seq_operations
*seq_ops
)
2746 struct user_namespace
*ns
= NULL
;
2747 struct task_struct
*task
;
2748 struct seq_file
*seq
;
2751 task
= get_proc_task(inode
);
2754 ns
= get_user_ns(task_cred_xxx(task
, user_ns
));
2756 put_task_struct(task
);
2761 ret
= seq_open(file
, seq_ops
);
2765 seq
= file
->private_data
;
2775 static int proc_id_map_release(struct inode
*inode
, struct file
*file
)
2777 struct seq_file
*seq
= file
->private_data
;
2778 struct user_namespace
*ns
= seq
->private;
2780 return seq_release(inode
, file
);
2783 static int proc_uid_map_open(struct inode
*inode
, struct file
*file
)
2785 return proc_id_map_open(inode
, file
, &proc_uid_seq_operations
);
2788 static int proc_gid_map_open(struct inode
*inode
, struct file
*file
)
2790 return proc_id_map_open(inode
, file
, &proc_gid_seq_operations
);
2793 static int proc_projid_map_open(struct inode
*inode
, struct file
*file
)
2795 return proc_id_map_open(inode
, file
, &proc_projid_seq_operations
);
2798 static const struct file_operations proc_uid_map_operations
= {
2799 .open
= proc_uid_map_open
,
2800 .write
= proc_uid_map_write
,
2802 .llseek
= seq_lseek
,
2803 .release
= proc_id_map_release
,
2806 static const struct file_operations proc_gid_map_operations
= {
2807 .open
= proc_gid_map_open
,
2808 .write
= proc_gid_map_write
,
2810 .llseek
= seq_lseek
,
2811 .release
= proc_id_map_release
,
2814 static const struct file_operations proc_projid_map_operations
= {
2815 .open
= proc_projid_map_open
,
2816 .write
= proc_projid_map_write
,
2818 .llseek
= seq_lseek
,
2819 .release
= proc_id_map_release
,
2822 static int proc_setgroups_open(struct inode
*inode
, struct file
*file
)
2824 struct user_namespace
*ns
= NULL
;
2825 struct task_struct
*task
;
2829 task
= get_proc_task(inode
);
2832 ns
= get_user_ns(task_cred_xxx(task
, user_ns
));
2834 put_task_struct(task
);
2839 if (file
->f_mode
& FMODE_WRITE
) {
2841 if (!ns_capable(ns
, CAP_SYS_ADMIN
))
2845 ret
= single_open(file
, &proc_setgroups_show
, ns
);
2856 static int proc_setgroups_release(struct inode
*inode
, struct file
*file
)
2858 struct seq_file
*seq
= file
->private_data
;
2859 struct user_namespace
*ns
= seq
->private;
2860 int ret
= single_release(inode
, file
);
2865 static const struct file_operations proc_setgroups_operations
= {
2866 .open
= proc_setgroups_open
,
2867 .write
= proc_setgroups_write
,
2869 .llseek
= seq_lseek
,
2870 .release
= proc_setgroups_release
,
2872 #endif /* CONFIG_USER_NS */
2874 static int proc_pid_personality(struct seq_file
*m
, struct pid_namespace
*ns
,
2875 struct pid
*pid
, struct task_struct
*task
)
2877 int err
= lock_trace(task
);
2879 seq_printf(m
, "%08x\n", task
->personality
);
2885 #ifdef CONFIG_LIVEPATCH
2886 static int proc_pid_patch_state(struct seq_file
*m
, struct pid_namespace
*ns
,
2887 struct pid
*pid
, struct task_struct
*task
)
2889 seq_printf(m
, "%d\n", task
->patch_state
);
2892 #endif /* CONFIG_LIVEPATCH */
2897 static const struct file_operations proc_task_operations
;
2898 static const struct inode_operations proc_task_inode_operations
;
2900 static const struct pid_entry tgid_base_stuff
[] = {
2901 DIR("task", S_IRUGO
|S_IXUGO
, proc_task_inode_operations
, proc_task_operations
),
2902 DIR("fd", S_IRUSR
|S_IXUSR
, proc_fd_inode_operations
, proc_fd_operations
),
2903 DIR("map_files", S_IRUSR
|S_IXUSR
, proc_map_files_inode_operations
, proc_map_files_operations
),
2904 DIR("fdinfo", S_IRUSR
|S_IXUSR
, proc_fdinfo_inode_operations
, proc_fdinfo_operations
),
2905 DIR("ns", S_IRUSR
|S_IXUGO
, proc_ns_dir_inode_operations
, proc_ns_dir_operations
),
2907 DIR("net", S_IRUGO
|S_IXUGO
, proc_net_inode_operations
, proc_net_operations
),
2909 REG("environ", S_IRUSR
, proc_environ_operations
),
2910 REG("auxv", S_IRUSR
, proc_auxv_operations
),
2911 ONE("status", S_IRUGO
, proc_pid_status
),
2912 ONE("personality", S_IRUSR
, proc_pid_personality
),
2913 ONE("limits", S_IRUGO
, proc_pid_limits
),
2914 #ifdef CONFIG_SCHED_DEBUG
2915 REG("sched", S_IRUGO
|S_IWUSR
, proc_pid_sched_operations
),
2917 #ifdef CONFIG_SCHED_AUTOGROUP
2918 REG("autogroup", S_IRUGO
|S_IWUSR
, proc_pid_sched_autogroup_operations
),
2920 REG("comm", S_IRUGO
|S_IWUSR
, proc_pid_set_comm_operations
),
2921 #ifdef CONFIG_HAVE_ARCH_TRACEHOOK
2922 ONE("syscall", S_IRUSR
, proc_pid_syscall
),
2924 REG("cmdline", S_IRUGO
, proc_pid_cmdline_ops
),
2925 ONE("stat", S_IRUGO
, proc_tgid_stat
),
2926 ONE("statm", S_IRUGO
, proc_pid_statm
),
2927 REG("maps", S_IRUGO
, proc_pid_maps_operations
),
2929 REG("numa_maps", S_IRUGO
, proc_pid_numa_maps_operations
),
2931 REG("mem", S_IRUSR
|S_IWUSR
, proc_mem_operations
),
2932 LNK("cwd", proc_cwd_link
),
2933 LNK("root", proc_root_link
),
2934 LNK("exe", proc_exe_link
),
2935 REG("mounts", S_IRUGO
, proc_mounts_operations
),
2936 REG("mountinfo", S_IRUGO
, proc_mountinfo_operations
),
2937 REG("mountstats", S_IRUSR
, proc_mountstats_operations
),
2938 #ifdef CONFIG_PROC_PAGE_MONITOR
2939 REG("clear_refs", S_IWUSR
, proc_clear_refs_operations
),
2940 REG("smaps", S_IRUGO
, proc_pid_smaps_operations
),
2941 REG("smaps_rollup", S_IRUGO
, proc_pid_smaps_rollup_operations
),
2942 REG("pagemap", S_IRUSR
, proc_pagemap_operations
),
2944 #ifdef CONFIG_SECURITY
2945 DIR("attr", S_IRUGO
|S_IXUGO
, proc_attr_dir_inode_operations
, proc_attr_dir_operations
),
2947 #ifdef CONFIG_KALLSYMS
2948 ONE("wchan", S_IRUGO
, proc_pid_wchan
),
2950 #ifdef CONFIG_STACKTRACE
2951 ONE("stack", S_IRUSR
, proc_pid_stack
),
2953 #ifdef CONFIG_SCHED_INFO
2954 ONE("schedstat", S_IRUGO
, proc_pid_schedstat
),
2956 #ifdef CONFIG_LATENCYTOP
2957 REG("latency", S_IRUGO
, proc_lstats_operations
),
2959 #ifdef CONFIG_PROC_PID_CPUSET
2960 ONE("cpuset", S_IRUGO
, proc_cpuset_show
),
2962 #ifdef CONFIG_CGROUPS
2963 ONE("cgroup", S_IRUGO
, proc_cgroup_show
),
2965 ONE("oom_score", S_IRUGO
, proc_oom_score
),
2966 REG("oom_adj", S_IRUGO
|S_IWUSR
, proc_oom_adj_operations
),
2967 REG("oom_score_adj", S_IRUGO
|S_IWUSR
, proc_oom_score_adj_operations
),
2968 #ifdef CONFIG_AUDITSYSCALL
2969 REG("loginuid", S_IWUSR
|S_IRUGO
, proc_loginuid_operations
),
2970 REG("sessionid", S_IRUGO
, proc_sessionid_operations
),
2972 #ifdef CONFIG_FAULT_INJECTION
2973 REG("make-it-fail", S_IRUGO
|S_IWUSR
, proc_fault_inject_operations
),
2974 REG("fail-nth", 0644, proc_fail_nth_operations
),
2976 #ifdef CONFIG_ELF_CORE
2977 REG("coredump_filter", S_IRUGO
|S_IWUSR
, proc_coredump_filter_operations
),
2979 #ifdef CONFIG_TASK_IO_ACCOUNTING
2980 ONE("io", S_IRUSR
, proc_tgid_io_accounting
),
2982 #ifdef CONFIG_USER_NS
2983 REG("uid_map", S_IRUGO
|S_IWUSR
, proc_uid_map_operations
),
2984 REG("gid_map", S_IRUGO
|S_IWUSR
, proc_gid_map_operations
),
2985 REG("projid_map", S_IRUGO
|S_IWUSR
, proc_projid_map_operations
),
2986 REG("setgroups", S_IRUGO
|S_IWUSR
, proc_setgroups_operations
),
2988 #if defined(CONFIG_CHECKPOINT_RESTORE) && defined(CONFIG_POSIX_TIMERS)
2989 REG("timers", S_IRUGO
, proc_timers_operations
),
2991 REG("timerslack_ns", S_IRUGO
|S_IWUGO
, proc_pid_set_timerslack_ns_operations
),
2992 #ifdef CONFIG_LIVEPATCH
2993 ONE("patch_state", S_IRUSR
, proc_pid_patch_state
),
2997 static int proc_tgid_base_readdir(struct file
*file
, struct dir_context
*ctx
)
2999 return proc_pident_readdir(file
, ctx
,
3000 tgid_base_stuff
, ARRAY_SIZE(tgid_base_stuff
));
3003 static const struct file_operations proc_tgid_base_operations
= {
3004 .read
= generic_read_dir
,
3005 .iterate_shared
= proc_tgid_base_readdir
,
3006 .llseek
= generic_file_llseek
,
3009 static struct dentry
*proc_tgid_base_lookup(struct inode
*dir
, struct dentry
*dentry
, unsigned int flags
)
3011 return proc_pident_lookup(dir
, dentry
,
3012 tgid_base_stuff
, ARRAY_SIZE(tgid_base_stuff
));
3015 static const struct inode_operations proc_tgid_base_inode_operations
= {
3016 .lookup
= proc_tgid_base_lookup
,
3017 .getattr
= pid_getattr
,
3018 .setattr
= proc_setattr
,
3019 .permission
= proc_pid_permission
,
3022 static void proc_flush_task_mnt(struct vfsmount
*mnt
, pid_t pid
, pid_t tgid
)
3024 struct dentry
*dentry
, *leader
, *dir
;
3029 name
.len
= snprintf(buf
, sizeof(buf
), "%u", pid
);
3030 /* no ->d_hash() rejects on procfs */
3031 dentry
= d_hash_and_lookup(mnt
->mnt_root
, &name
);
3033 d_invalidate(dentry
);
3041 name
.len
= snprintf(buf
, sizeof(buf
), "%u", tgid
);
3042 leader
= d_hash_and_lookup(mnt
->mnt_root
, &name
);
3047 name
.len
= strlen(name
.name
);
3048 dir
= d_hash_and_lookup(leader
, &name
);
3050 goto out_put_leader
;
3053 name
.len
= snprintf(buf
, sizeof(buf
), "%u", pid
);
3054 dentry
= d_hash_and_lookup(dir
, &name
);
3056 d_invalidate(dentry
);
3068 * proc_flush_task - Remove dcache entries for @task from the /proc dcache.
3069 * @task: task that should be flushed.
3071 * When flushing dentries from proc, one needs to flush them from global
3072 * proc (proc_mnt) and from all the namespaces' procs this task was seen
3073 * in. This call is supposed to do all of this job.
3075 * Looks in the dcache for
3077 * /proc/@tgid/task/@pid
3078 * if either directory is present flushes it and all of it'ts children
3081 * It is safe and reasonable to cache /proc entries for a task until
3082 * that task exits. After that they just clog up the dcache with
3083 * useless entries, possibly causing useful dcache entries to be
3084 * flushed instead. This routine is proved to flush those useless
3085 * dcache entries at process exit time.
3087 * NOTE: This routine is just an optimization so it does not guarantee
3088 * that no dcache entries will exist at process exit time it
3089 * just makes it very unlikely that any will persist.
3092 void proc_flush_task(struct task_struct
*task
)
3095 struct pid
*pid
, *tgid
;
3098 pid
= task_pid(task
);
3099 tgid
= task_tgid(task
);
3101 for (i
= 0; i
<= pid
->level
; i
++) {
3102 upid
= &pid
->numbers
[i
];
3103 proc_flush_task_mnt(upid
->ns
->proc_mnt
, upid
->nr
,
3104 tgid
->numbers
[i
].nr
);
3108 static struct dentry
*proc_pid_instantiate(struct dentry
* dentry
,
3109 struct task_struct
*task
, const void *ptr
)
3111 struct inode
*inode
;
3113 inode
= proc_pid_make_inode(dentry
->d_sb
, task
, S_IFDIR
| S_IRUGO
| S_IXUGO
);
3115 return ERR_PTR(-ENOENT
);
3117 inode
->i_op
= &proc_tgid_base_inode_operations
;
3118 inode
->i_fop
= &proc_tgid_base_operations
;
3119 inode
->i_flags
|=S_IMMUTABLE
;
3121 set_nlink(inode
, nlink_tgid
);
3122 pid_update_inode(task
, inode
);
3124 d_set_d_op(dentry
, &pid_dentry_operations
);
3125 return d_splice_alias(inode
, dentry
);
3128 struct dentry
*proc_pid_lookup(struct inode
*dir
, struct dentry
* dentry
, unsigned int flags
)
3130 struct task_struct
*task
;
3132 struct pid_namespace
*ns
;
3133 struct dentry
*result
= ERR_PTR(-ENOENT
);
3135 tgid
= name_to_int(&dentry
->d_name
);
3139 ns
= dentry
->d_sb
->s_fs_info
;
3141 task
= find_task_by_pid_ns(tgid
, ns
);
3143 get_task_struct(task
);
3148 result
= proc_pid_instantiate(dentry
, task
, NULL
);
3149 put_task_struct(task
);
3155 * Find the first task with tgid >= tgid
3160 struct task_struct
*task
;
3162 static struct tgid_iter
next_tgid(struct pid_namespace
*ns
, struct tgid_iter iter
)
3167 put_task_struct(iter
.task
);
3171 pid
= find_ge_pid(iter
.tgid
, ns
);
3173 iter
.tgid
= pid_nr_ns(pid
, ns
);
3174 iter
.task
= pid_task(pid
, PIDTYPE_PID
);
3175 /* What we to know is if the pid we have find is the
3176 * pid of a thread_group_leader. Testing for task
3177 * being a thread_group_leader is the obvious thing
3178 * todo but there is a window when it fails, due to
3179 * the pid transfer logic in de_thread.
3181 * So we perform the straight forward test of seeing
3182 * if the pid we have found is the pid of a thread
3183 * group leader, and don't worry if the task we have
3184 * found doesn't happen to be a thread group leader.
3185 * As we don't care in the case of readdir.
3187 if (!iter
.task
|| !has_group_leader_pid(iter
.task
)) {
3191 get_task_struct(iter
.task
);
3197 #define TGID_OFFSET (FIRST_PROCESS_ENTRY + 2)
3199 /* for the /proc/ directory itself, after non-process stuff has been done */
3200 int proc_pid_readdir(struct file
*file
, struct dir_context
*ctx
)
3202 struct tgid_iter iter
;
3203 struct pid_namespace
*ns
= proc_pid_ns(file_inode(file
));
3204 loff_t pos
= ctx
->pos
;
3206 if (pos
>= PID_MAX_LIMIT
+ TGID_OFFSET
)
3209 if (pos
== TGID_OFFSET
- 2) {
3210 struct inode
*inode
= d_inode(ns
->proc_self
);
3211 if (!dir_emit(ctx
, "self", 4, inode
->i_ino
, DT_LNK
))
3213 ctx
->pos
= pos
= pos
+ 1;
3215 if (pos
== TGID_OFFSET
- 1) {
3216 struct inode
*inode
= d_inode(ns
->proc_thread_self
);
3217 if (!dir_emit(ctx
, "thread-self", 11, inode
->i_ino
, DT_LNK
))
3219 ctx
->pos
= pos
= pos
+ 1;
3221 iter
.tgid
= pos
- TGID_OFFSET
;
3223 for (iter
= next_tgid(ns
, iter
);
3225 iter
.tgid
+= 1, iter
= next_tgid(ns
, iter
)) {
3230 if (!has_pid_permissions(ns
, iter
.task
, HIDEPID_INVISIBLE
))
3233 len
= snprintf(name
, sizeof(name
), "%u", iter
.tgid
);
3234 ctx
->pos
= iter
.tgid
+ TGID_OFFSET
;
3235 if (!proc_fill_cache(file
, ctx
, name
, len
,
3236 proc_pid_instantiate
, iter
.task
, NULL
)) {
3237 put_task_struct(iter
.task
);
3241 ctx
->pos
= PID_MAX_LIMIT
+ TGID_OFFSET
;
3246 * proc_tid_comm_permission is a special permission function exclusively
3247 * used for the node /proc/<pid>/task/<tid>/comm.
3248 * It bypasses generic permission checks in the case where a task of the same
3249 * task group attempts to access the node.
3250 * The rationale behind this is that glibc and bionic access this node for
3251 * cross thread naming (pthread_set/getname_np(!self)). However, if
3252 * PR_SET_DUMPABLE gets set to 0 this node among others becomes uid=0 gid=0,
3253 * which locks out the cross thread naming implementation.
3254 * This function makes sure that the node is always accessible for members of
3255 * same thread group.
3257 static int proc_tid_comm_permission(struct inode
*inode
, int mask
)
3259 bool is_same_tgroup
;
3260 struct task_struct
*task
;
3262 task
= get_proc_task(inode
);
3265 is_same_tgroup
= same_thread_group(current
, task
);
3266 put_task_struct(task
);
3268 if (likely(is_same_tgroup
&& !(mask
& MAY_EXEC
))) {
3269 /* This file (/proc/<pid>/task/<tid>/comm) can always be
3270 * read or written by the members of the corresponding
3276 return generic_permission(inode
, mask
);
3279 static const struct inode_operations proc_tid_comm_inode_operations
= {
3280 .permission
= proc_tid_comm_permission
,
3286 static const struct pid_entry tid_base_stuff
[] = {
3287 DIR("fd", S_IRUSR
|S_IXUSR
, proc_fd_inode_operations
, proc_fd_operations
),
3288 DIR("fdinfo", S_IRUSR
|S_IXUSR
, proc_fdinfo_inode_operations
, proc_fdinfo_operations
),
3289 DIR("ns", S_IRUSR
|S_IXUGO
, proc_ns_dir_inode_operations
, proc_ns_dir_operations
),
3291 DIR("net", S_IRUGO
|S_IXUGO
, proc_net_inode_operations
, proc_net_operations
),
3293 REG("environ", S_IRUSR
, proc_environ_operations
),
3294 REG("auxv", S_IRUSR
, proc_auxv_operations
),
3295 ONE("status", S_IRUGO
, proc_pid_status
),
3296 ONE("personality", S_IRUSR
, proc_pid_personality
),
3297 ONE("limits", S_IRUGO
, proc_pid_limits
),
3298 #ifdef CONFIG_SCHED_DEBUG
3299 REG("sched", S_IRUGO
|S_IWUSR
, proc_pid_sched_operations
),
3301 NOD("comm", S_IFREG
|S_IRUGO
|S_IWUSR
,
3302 &proc_tid_comm_inode_operations
,
3303 &proc_pid_set_comm_operations
, {}),
3304 #ifdef CONFIG_HAVE_ARCH_TRACEHOOK
3305 ONE("syscall", S_IRUSR
, proc_pid_syscall
),
3307 REG("cmdline", S_IRUGO
, proc_pid_cmdline_ops
),
3308 ONE("stat", S_IRUGO
, proc_tid_stat
),
3309 ONE("statm", S_IRUGO
, proc_pid_statm
),
3310 REG("maps", S_IRUGO
, proc_pid_maps_operations
),
3311 #ifdef CONFIG_PROC_CHILDREN
3312 REG("children", S_IRUGO
, proc_tid_children_operations
),
3315 REG("numa_maps", S_IRUGO
, proc_pid_numa_maps_operations
),
3317 REG("mem", S_IRUSR
|S_IWUSR
, proc_mem_operations
),
3318 LNK("cwd", proc_cwd_link
),
3319 LNK("root", proc_root_link
),
3320 LNK("exe", proc_exe_link
),
3321 REG("mounts", S_IRUGO
, proc_mounts_operations
),
3322 REG("mountinfo", S_IRUGO
, proc_mountinfo_operations
),
3323 #ifdef CONFIG_PROC_PAGE_MONITOR
3324 REG("clear_refs", S_IWUSR
, proc_clear_refs_operations
),
3325 REG("smaps", S_IRUGO
, proc_pid_smaps_operations
),
3326 REG("smaps_rollup", S_IRUGO
, proc_pid_smaps_rollup_operations
),
3327 REG("pagemap", S_IRUSR
, proc_pagemap_operations
),
3329 #ifdef CONFIG_SECURITY
3330 DIR("attr", S_IRUGO
|S_IXUGO
, proc_attr_dir_inode_operations
, proc_attr_dir_operations
),
3332 #ifdef CONFIG_KALLSYMS
3333 ONE("wchan", S_IRUGO
, proc_pid_wchan
),
3335 #ifdef CONFIG_STACKTRACE
3336 ONE("stack", S_IRUSR
, proc_pid_stack
),
3338 #ifdef CONFIG_SCHED_INFO
3339 ONE("schedstat", S_IRUGO
, proc_pid_schedstat
),
3341 #ifdef CONFIG_LATENCYTOP
3342 REG("latency", S_IRUGO
, proc_lstats_operations
),
3344 #ifdef CONFIG_PROC_PID_CPUSET
3345 ONE("cpuset", S_IRUGO
, proc_cpuset_show
),
3347 #ifdef CONFIG_CGROUPS
3348 ONE("cgroup", S_IRUGO
, proc_cgroup_show
),
3350 ONE("oom_score", S_IRUGO
, proc_oom_score
),
3351 REG("oom_adj", S_IRUGO
|S_IWUSR
, proc_oom_adj_operations
),
3352 REG("oom_score_adj", S_IRUGO
|S_IWUSR
, proc_oom_score_adj_operations
),
3353 #ifdef CONFIG_AUDITSYSCALL
3354 REG("loginuid", S_IWUSR
|S_IRUGO
, proc_loginuid_operations
),
3355 REG("sessionid", S_IRUGO
, proc_sessionid_operations
),
3357 #ifdef CONFIG_FAULT_INJECTION
3358 REG("make-it-fail", S_IRUGO
|S_IWUSR
, proc_fault_inject_operations
),
3359 REG("fail-nth", 0644, proc_fail_nth_operations
),
3361 #ifdef CONFIG_TASK_IO_ACCOUNTING
3362 ONE("io", S_IRUSR
, proc_tid_io_accounting
),
3364 #ifdef CONFIG_USER_NS
3365 REG("uid_map", S_IRUGO
|S_IWUSR
, proc_uid_map_operations
),
3366 REG("gid_map", S_IRUGO
|S_IWUSR
, proc_gid_map_operations
),
3367 REG("projid_map", S_IRUGO
|S_IWUSR
, proc_projid_map_operations
),
3368 REG("setgroups", S_IRUGO
|S_IWUSR
, proc_setgroups_operations
),
3370 #ifdef CONFIG_LIVEPATCH
3371 ONE("patch_state", S_IRUSR
, proc_pid_patch_state
),
3375 static int proc_tid_base_readdir(struct file
*file
, struct dir_context
*ctx
)
3377 return proc_pident_readdir(file
, ctx
,
3378 tid_base_stuff
, ARRAY_SIZE(tid_base_stuff
));
3381 static struct dentry
*proc_tid_base_lookup(struct inode
*dir
, struct dentry
*dentry
, unsigned int flags
)
3383 return proc_pident_lookup(dir
, dentry
,
3384 tid_base_stuff
, ARRAY_SIZE(tid_base_stuff
));
3387 static const struct file_operations proc_tid_base_operations
= {
3388 .read
= generic_read_dir
,
3389 .iterate_shared
= proc_tid_base_readdir
,
3390 .llseek
= generic_file_llseek
,
3393 static const struct inode_operations proc_tid_base_inode_operations
= {
3394 .lookup
= proc_tid_base_lookup
,
3395 .getattr
= pid_getattr
,
3396 .setattr
= proc_setattr
,
3399 static struct dentry
*proc_task_instantiate(struct dentry
*dentry
,
3400 struct task_struct
*task
, const void *ptr
)
3402 struct inode
*inode
;
3403 inode
= proc_pid_make_inode(dentry
->d_sb
, task
, S_IFDIR
| S_IRUGO
| S_IXUGO
);
3405 return ERR_PTR(-ENOENT
);
3407 inode
->i_op
= &proc_tid_base_inode_operations
;
3408 inode
->i_fop
= &proc_tid_base_operations
;
3409 inode
->i_flags
|= S_IMMUTABLE
;
3411 set_nlink(inode
, nlink_tid
);
3412 pid_update_inode(task
, inode
);
3414 d_set_d_op(dentry
, &pid_dentry_operations
);
3415 return d_splice_alias(inode
, dentry
);
3418 static struct dentry
*proc_task_lookup(struct inode
*dir
, struct dentry
* dentry
, unsigned int flags
)
3420 struct task_struct
*task
;
3421 struct task_struct
*leader
= get_proc_task(dir
);
3423 struct pid_namespace
*ns
;
3424 struct dentry
*result
= ERR_PTR(-ENOENT
);
3429 tid
= name_to_int(&dentry
->d_name
);
3433 ns
= dentry
->d_sb
->s_fs_info
;
3435 task
= find_task_by_pid_ns(tid
, ns
);
3437 get_task_struct(task
);
3441 if (!same_thread_group(leader
, task
))
3444 result
= proc_task_instantiate(dentry
, task
, NULL
);
3446 put_task_struct(task
);
3448 put_task_struct(leader
);
3454 * Find the first tid of a thread group to return to user space.
3456 * Usually this is just the thread group leader, but if the users
3457 * buffer was too small or there was a seek into the middle of the
3458 * directory we have more work todo.
3460 * In the case of a short read we start with find_task_by_pid.
3462 * In the case of a seek we start with the leader and walk nr
3465 static struct task_struct
*first_tid(struct pid
*pid
, int tid
, loff_t f_pos
,
3466 struct pid_namespace
*ns
)
3468 struct task_struct
*pos
, *task
;
3469 unsigned long nr
= f_pos
;
3471 if (nr
!= f_pos
) /* 32bit overflow? */
3475 task
= pid_task(pid
, PIDTYPE_PID
);
3479 /* Attempt to start with the tid of a thread */
3481 pos
= find_task_by_pid_ns(tid
, ns
);
3482 if (pos
&& same_thread_group(pos
, task
))
3486 /* If nr exceeds the number of threads there is nothing todo */
3487 if (nr
>= get_nr_threads(task
))
3490 /* If we haven't found our starting place yet start
3491 * with the leader and walk nr threads forward.
3493 pos
= task
= task
->group_leader
;
3497 } while_each_thread(task
, pos
);
3502 get_task_struct(pos
);
3509 * Find the next thread in the thread list.
3510 * Return NULL if there is an error or no next thread.
3512 * The reference to the input task_struct is released.
3514 static struct task_struct
*next_tid(struct task_struct
*start
)
3516 struct task_struct
*pos
= NULL
;
3518 if (pid_alive(start
)) {
3519 pos
= next_thread(start
);
3520 if (thread_group_leader(pos
))
3523 get_task_struct(pos
);
3526 put_task_struct(start
);
3530 /* for the /proc/TGID/task/ directories */
3531 static int proc_task_readdir(struct file
*file
, struct dir_context
*ctx
)
3533 struct inode
*inode
= file_inode(file
);
3534 struct task_struct
*task
;
3535 struct pid_namespace
*ns
;
3538 if (proc_inode_is_dead(inode
))
3541 if (!dir_emit_dots(file
, ctx
))
3544 /* f_version caches the tgid value that the last readdir call couldn't
3545 * return. lseek aka telldir automagically resets f_version to 0.
3547 ns
= proc_pid_ns(inode
);
3548 tid
= (int)file
->f_version
;
3549 file
->f_version
= 0;
3550 for (task
= first_tid(proc_pid(inode
), tid
, ctx
->pos
- 2, ns
);
3552 task
= next_tid(task
), ctx
->pos
++) {
3555 tid
= task_pid_nr_ns(task
, ns
);
3556 len
= snprintf(name
, sizeof(name
), "%u", tid
);
3557 if (!proc_fill_cache(file
, ctx
, name
, len
,
3558 proc_task_instantiate
, task
, NULL
)) {
3559 /* returning this tgid failed, save it as the first
3560 * pid for the next readir call */
3561 file
->f_version
= (u64
)tid
;
3562 put_task_struct(task
);
3570 static int proc_task_getattr(const struct path
*path
, struct kstat
*stat
,
3571 u32 request_mask
, unsigned int query_flags
)
3573 struct inode
*inode
= d_inode(path
->dentry
);
3574 struct task_struct
*p
= get_proc_task(inode
);
3575 generic_fillattr(inode
, stat
);
3578 stat
->nlink
+= get_nr_threads(p
);
3585 static const struct inode_operations proc_task_inode_operations
= {
3586 .lookup
= proc_task_lookup
,
3587 .getattr
= proc_task_getattr
,
3588 .setattr
= proc_setattr
,
3589 .permission
= proc_pid_permission
,
3592 static const struct file_operations proc_task_operations
= {
3593 .read
= generic_read_dir
,
3594 .iterate_shared
= proc_task_readdir
,
3595 .llseek
= generic_file_llseek
,
3598 void __init
set_proc_pid_nlink(void)
3600 nlink_tid
= pid_entry_nlink(tid_base_stuff
, ARRAY_SIZE(tid_base_stuff
));
3601 nlink_tgid
= pid_entry_nlink(tgid_base_stuff
, ARRAY_SIZE(tgid_base_stuff
));