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/generic-radix-tree.h>
63 #include <linux/string.h>
64 #include <linux/seq_file.h>
65 #include <linux/namei.h>
66 #include <linux/mnt_namespace.h>
68 #include <linux/swap.h>
69 #include <linux/rcupdate.h>
70 #include <linux/kallsyms.h>
71 #include <linux/stacktrace.h>
72 #include <linux/resource.h>
73 #include <linux/module.h>
74 #include <linux/mount.h>
75 #include <linux/security.h>
76 #include <linux/ptrace.h>
77 #include <linux/tracehook.h>
78 #include <linux/printk.h>
79 #include <linux/cache.h>
80 #include <linux/cgroup.h>
81 #include <linux/cpuset.h>
82 #include <linux/audit.h>
83 #include <linux/poll.h>
84 #include <linux/nsproxy.h>
85 #include <linux/oom.h>
86 #include <linux/elf.h>
87 #include <linux/pid_namespace.h>
88 #include <linux/user_namespace.h>
89 #include <linux/fs_struct.h>
90 #include <linux/slab.h>
91 #include <linux/sched/autogroup.h>
92 #include <linux/sched/mm.h>
93 #include <linux/sched/coredump.h>
94 #include <linux/sched/debug.h>
95 #include <linux/sched/stat.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 } )
146 #define ATTR(LSM, NAME, MODE) \
147 NOD(NAME, (S_IFREG|(MODE)), \
148 NULL, &proc_pid_attr_operations, \
152 * Count the number of hardlinks for the pid_entry table, excluding the .
155 static unsigned int __init
pid_entry_nlink(const struct pid_entry
*entries
,
162 for (i
= 0; i
< n
; ++i
) {
163 if (S_ISDIR(entries
[i
].mode
))
170 static int get_task_root(struct task_struct
*task
, struct path
*root
)
172 int result
= -ENOENT
;
176 get_fs_root(task
->fs
, root
);
183 static int proc_cwd_link(struct dentry
*dentry
, struct path
*path
)
185 struct task_struct
*task
= get_proc_task(d_inode(dentry
));
186 int result
= -ENOENT
;
191 get_fs_pwd(task
->fs
, path
);
195 put_task_struct(task
);
200 static int proc_root_link(struct dentry
*dentry
, struct path
*path
)
202 struct task_struct
*task
= get_proc_task(d_inode(dentry
));
203 int result
= -ENOENT
;
206 result
= get_task_root(task
, path
);
207 put_task_struct(task
);
213 * If the user used setproctitle(), we just get the string from
214 * user space at arg_start, and limit it to a maximum of one page.
216 static ssize_t
get_mm_proctitle(struct mm_struct
*mm
, char __user
*buf
,
217 size_t count
, unsigned long pos
,
218 unsigned long arg_start
)
223 if (pos
>= PAGE_SIZE
)
226 page
= (char *)__get_free_page(GFP_KERNEL
);
231 got
= access_remote_vm(mm
, arg_start
, page
, PAGE_SIZE
, FOLL_ANON
);
233 int len
= strnlen(page
, got
);
235 /* Include the NUL character if it was found */
243 len
-= copy_to_user(buf
, page
+pos
, len
);
249 free_page((unsigned long)page
);
253 static ssize_t
get_mm_cmdline(struct mm_struct
*mm
, char __user
*buf
,
254 size_t count
, loff_t
*ppos
)
256 unsigned long arg_start
, arg_end
, env_start
, env_end
;
257 unsigned long pos
, len
;
260 /* Check if process spawned far enough to have cmdline. */
264 spin_lock(&mm
->arg_lock
);
265 arg_start
= mm
->arg_start
;
266 arg_end
= mm
->arg_end
;
267 env_start
= mm
->env_start
;
268 env_end
= mm
->env_end
;
269 spin_unlock(&mm
->arg_lock
);
271 if (arg_start
>= arg_end
)
275 * We allow setproctitle() to overwrite the argument
276 * strings, and overflow past the original end. But
277 * only when it overflows into the environment area.
279 if (env_start
!= arg_end
|| env_end
< env_start
)
280 env_start
= env_end
= arg_end
;
281 len
= env_end
- arg_start
;
283 /* We're not going to care if "*ppos" has high bits set */
287 if (count
> len
- pos
)
293 * Magical special case: if the argv[] end byte is not
294 * zero, the user has overwritten it with setproctitle(3).
296 * Possible future enhancement: do this only once when
297 * pos is 0, and set a flag in the 'struct file'.
299 if (access_remote_vm(mm
, arg_end
-1, &c
, 1, FOLL_ANON
) == 1 && c
)
300 return get_mm_proctitle(mm
, buf
, count
, pos
, arg_start
);
303 * For the non-setproctitle() case we limit things strictly
304 * to the [arg_start, arg_end[ range.
307 if (pos
< arg_start
|| pos
>= arg_end
)
309 if (count
> arg_end
- pos
)
310 count
= arg_end
- pos
;
312 page
= (char *)__get_free_page(GFP_KERNEL
);
319 size_t size
= min_t(size_t, PAGE_SIZE
, count
);
321 got
= access_remote_vm(mm
, pos
, page
, size
, FOLL_ANON
);
324 got
-= copy_to_user(buf
, page
, got
);
325 if (unlikely(!got
)) {
336 free_page((unsigned long)page
);
340 static ssize_t
get_task_cmdline(struct task_struct
*tsk
, char __user
*buf
,
341 size_t count
, loff_t
*pos
)
343 struct mm_struct
*mm
;
346 mm
= get_task_mm(tsk
);
350 ret
= get_mm_cmdline(mm
, buf
, count
, pos
);
355 static ssize_t
proc_pid_cmdline_read(struct file
*file
, char __user
*buf
,
356 size_t count
, loff_t
*pos
)
358 struct task_struct
*tsk
;
363 tsk
= get_proc_task(file_inode(file
));
366 ret
= get_task_cmdline(tsk
, buf
, count
, pos
);
367 put_task_struct(tsk
);
373 static const struct file_operations proc_pid_cmdline_ops
= {
374 .read
= proc_pid_cmdline_read
,
375 .llseek
= generic_file_llseek
,
378 #ifdef CONFIG_KALLSYMS
380 * Provides a wchan file via kallsyms in a proper one-value-per-file format.
381 * Returns the resolved symbol. If that fails, simply return the address.
383 static int proc_pid_wchan(struct seq_file
*m
, struct pid_namespace
*ns
,
384 struct pid
*pid
, struct task_struct
*task
)
387 char symname
[KSYM_NAME_LEN
];
389 if (!ptrace_may_access(task
, PTRACE_MODE_READ_FSCREDS
))
392 wchan
= get_wchan(task
);
393 if (wchan
&& !lookup_symbol_name(wchan
, symname
)) {
394 seq_puts(m
, symname
);
402 #endif /* CONFIG_KALLSYMS */
404 static int lock_trace(struct task_struct
*task
)
406 int err
= down_read_killable(&task
->signal
->exec_update_lock
);
409 if (!ptrace_may_access(task
, PTRACE_MODE_ATTACH_FSCREDS
)) {
410 up_read(&task
->signal
->exec_update_lock
);
416 static void unlock_trace(struct task_struct
*task
)
418 up_read(&task
->signal
->exec_update_lock
);
421 #ifdef CONFIG_STACKTRACE
423 #define MAX_STACK_TRACE_DEPTH 64
425 static int proc_pid_stack(struct seq_file
*m
, struct pid_namespace
*ns
,
426 struct pid
*pid
, struct task_struct
*task
)
428 unsigned long *entries
;
432 * The ability to racily run the kernel stack unwinder on a running task
433 * and then observe the unwinder output is scary; while it is useful for
434 * debugging kernel issues, it can also allow an attacker to leak kernel
436 * Doing this in a manner that is at least safe from races would require
437 * some work to ensure that the remote task can not be scheduled; and
438 * even then, this would still expose the unwinder as local attack
440 * Therefore, this interface is restricted to root.
442 if (!file_ns_capable(m
->file
, &init_user_ns
, CAP_SYS_ADMIN
))
445 entries
= kmalloc_array(MAX_STACK_TRACE_DEPTH
, sizeof(*entries
),
450 err
= lock_trace(task
);
452 unsigned int i
, nr_entries
;
454 nr_entries
= stack_trace_save_tsk(task
, entries
,
455 MAX_STACK_TRACE_DEPTH
, 0);
457 for (i
= 0; i
< nr_entries
; i
++) {
458 seq_printf(m
, "[<0>] %pB\n", (void *)entries
[i
]);
469 #ifdef CONFIG_SCHED_INFO
471 * Provides /proc/PID/schedstat
473 static int proc_pid_schedstat(struct seq_file
*m
, struct pid_namespace
*ns
,
474 struct pid
*pid
, struct task_struct
*task
)
476 if (unlikely(!sched_info_on()))
477 seq_puts(m
, "0 0 0\n");
479 seq_printf(m
, "%llu %llu %lu\n",
480 (unsigned long long)task
->se
.sum_exec_runtime
,
481 (unsigned long long)task
->sched_info
.run_delay
,
482 task
->sched_info
.pcount
);
488 #ifdef CONFIG_LATENCYTOP
489 static int lstats_show_proc(struct seq_file
*m
, void *v
)
492 struct inode
*inode
= m
->private;
493 struct task_struct
*task
= get_proc_task(inode
);
497 seq_puts(m
, "Latency Top version : v0.1\n");
498 for (i
= 0; i
< LT_SAVECOUNT
; i
++) {
499 struct latency_record
*lr
= &task
->latency_record
[i
];
500 if (lr
->backtrace
[0]) {
502 seq_printf(m
, "%i %li %li",
503 lr
->count
, lr
->time
, lr
->max
);
504 for (q
= 0; q
< LT_BACKTRACEDEPTH
; q
++) {
505 unsigned long bt
= lr
->backtrace
[q
];
509 seq_printf(m
, " %ps", (void *)bt
);
515 put_task_struct(task
);
519 static int lstats_open(struct inode
*inode
, struct file
*file
)
521 return single_open(file
, lstats_show_proc
, inode
);
524 static ssize_t
lstats_write(struct file
*file
, const char __user
*buf
,
525 size_t count
, loff_t
*offs
)
527 struct task_struct
*task
= get_proc_task(file_inode(file
));
531 clear_tsk_latency_tracing(task
);
532 put_task_struct(task
);
537 static const struct file_operations proc_lstats_operations
= {
540 .write
= lstats_write
,
542 .release
= single_release
,
547 static int proc_oom_score(struct seq_file
*m
, struct pid_namespace
*ns
,
548 struct pid
*pid
, struct task_struct
*task
)
550 unsigned long totalpages
= totalram_pages() + total_swap_pages
;
551 unsigned long points
= 0;
554 badness
= oom_badness(task
, totalpages
);
556 * Special case OOM_SCORE_ADJ_MIN for all others scale the
557 * badness value into [0, 2000] range which we have been
558 * exporting for a long time so userspace might depend on it.
560 if (badness
!= LONG_MIN
)
561 points
= (1000 + badness
* 1000 / (long)totalpages
) * 2 / 3;
563 seq_printf(m
, "%lu\n", points
);
573 static const struct limit_names lnames
[RLIM_NLIMITS
] = {
574 [RLIMIT_CPU
] = {"Max cpu time", "seconds"},
575 [RLIMIT_FSIZE
] = {"Max file size", "bytes"},
576 [RLIMIT_DATA
] = {"Max data size", "bytes"},
577 [RLIMIT_STACK
] = {"Max stack size", "bytes"},
578 [RLIMIT_CORE
] = {"Max core file size", "bytes"},
579 [RLIMIT_RSS
] = {"Max resident set", "bytes"},
580 [RLIMIT_NPROC
] = {"Max processes", "processes"},
581 [RLIMIT_NOFILE
] = {"Max open files", "files"},
582 [RLIMIT_MEMLOCK
] = {"Max locked memory", "bytes"},
583 [RLIMIT_AS
] = {"Max address space", "bytes"},
584 [RLIMIT_LOCKS
] = {"Max file locks", "locks"},
585 [RLIMIT_SIGPENDING
] = {"Max pending signals", "signals"},
586 [RLIMIT_MSGQUEUE
] = {"Max msgqueue size", "bytes"},
587 [RLIMIT_NICE
] = {"Max nice priority", NULL
},
588 [RLIMIT_RTPRIO
] = {"Max realtime priority", NULL
},
589 [RLIMIT_RTTIME
] = {"Max realtime timeout", "us"},
592 /* Display limits for a process */
593 static int proc_pid_limits(struct seq_file
*m
, struct pid_namespace
*ns
,
594 struct pid
*pid
, struct task_struct
*task
)
599 struct rlimit rlim
[RLIM_NLIMITS
];
601 if (!lock_task_sighand(task
, &flags
))
603 memcpy(rlim
, task
->signal
->rlim
, sizeof(struct rlimit
) * RLIM_NLIMITS
);
604 unlock_task_sighand(task
, &flags
);
607 * print the file header
614 for (i
= 0; i
< RLIM_NLIMITS
; i
++) {
615 if (rlim
[i
].rlim_cur
== RLIM_INFINITY
)
616 seq_printf(m
, "%-25s %-20s ",
617 lnames
[i
].name
, "unlimited");
619 seq_printf(m
, "%-25s %-20lu ",
620 lnames
[i
].name
, rlim
[i
].rlim_cur
);
622 if (rlim
[i
].rlim_max
== RLIM_INFINITY
)
623 seq_printf(m
, "%-20s ", "unlimited");
625 seq_printf(m
, "%-20lu ", rlim
[i
].rlim_max
);
628 seq_printf(m
, "%-10s\n", lnames
[i
].unit
);
636 #ifdef CONFIG_HAVE_ARCH_TRACEHOOK
637 static int proc_pid_syscall(struct seq_file
*m
, struct pid_namespace
*ns
,
638 struct pid
*pid
, struct task_struct
*task
)
640 struct syscall_info info
;
641 u64
*args
= &info
.data
.args
[0];
644 res
= lock_trace(task
);
648 if (task_current_syscall(task
, &info
))
649 seq_puts(m
, "running\n");
650 else if (info
.data
.nr
< 0)
651 seq_printf(m
, "%d 0x%llx 0x%llx\n",
652 info
.data
.nr
, info
.sp
, info
.data
.instruction_pointer
);
655 "%d 0x%llx 0x%llx 0x%llx 0x%llx 0x%llx 0x%llx 0x%llx 0x%llx\n",
657 args
[0], args
[1], args
[2], args
[3], args
[4], args
[5],
658 info
.sp
, info
.data
.instruction_pointer
);
663 #endif /* CONFIG_HAVE_ARCH_TRACEHOOK */
665 /************************************************************************/
666 /* Here the fs part begins */
667 /************************************************************************/
669 /* permission checks */
670 static int proc_fd_access_allowed(struct inode
*inode
)
672 struct task_struct
*task
;
674 /* Allow access to a task's file descriptors if it is us or we
675 * may use ptrace attach to the process and find out that
678 task
= get_proc_task(inode
);
680 allowed
= ptrace_may_access(task
, PTRACE_MODE_READ_FSCREDS
);
681 put_task_struct(task
);
686 int proc_setattr(struct dentry
*dentry
, struct iattr
*attr
)
689 struct inode
*inode
= d_inode(dentry
);
691 if (attr
->ia_valid
& ATTR_MODE
)
694 error
= setattr_prepare(dentry
, attr
);
698 setattr_copy(inode
, attr
);
699 mark_inode_dirty(inode
);
704 * May current process learn task's sched/cmdline info (for hide_pid_min=1)
705 * or euid/egid (for hide_pid_min=2)?
707 static bool has_pid_permissions(struct pid_namespace
*pid
,
708 struct task_struct
*task
,
711 if (pid
->hide_pid
< hide_pid_min
)
713 if (in_group_p(pid
->pid_gid
))
715 return ptrace_may_access(task
, PTRACE_MODE_READ_FSCREDS
);
719 static int proc_pid_permission(struct inode
*inode
, int mask
)
721 struct pid_namespace
*pid
= proc_pid_ns(inode
);
722 struct task_struct
*task
;
725 task
= get_proc_task(inode
);
728 has_perms
= has_pid_permissions(pid
, task
, HIDEPID_NO_ACCESS
);
729 put_task_struct(task
);
732 if (pid
->hide_pid
== HIDEPID_INVISIBLE
) {
734 * Let's make getdents(), stat(), and open()
735 * consistent with each other. If a process
736 * may not stat() a file, it shouldn't be seen
744 return generic_permission(inode
, mask
);
749 static const struct inode_operations proc_def_inode_operations
= {
750 .setattr
= proc_setattr
,
753 static int proc_single_show(struct seq_file
*m
, void *v
)
755 struct inode
*inode
= m
->private;
756 struct pid_namespace
*ns
= proc_pid_ns(inode
);
757 struct pid
*pid
= proc_pid(inode
);
758 struct task_struct
*task
;
761 task
= get_pid_task(pid
, PIDTYPE_PID
);
765 ret
= PROC_I(inode
)->op
.proc_show(m
, ns
, pid
, task
);
767 put_task_struct(task
);
771 static int proc_single_open(struct inode
*inode
, struct file
*filp
)
773 return single_open(filp
, proc_single_show
, inode
);
776 static const struct file_operations proc_single_file_operations
= {
777 .open
= proc_single_open
,
780 .release
= single_release
,
784 struct mm_struct
*proc_mem_open(struct inode
*inode
, unsigned int mode
)
786 struct task_struct
*task
= get_proc_task(inode
);
787 struct mm_struct
*mm
= ERR_PTR(-ESRCH
);
790 mm
= mm_access(task
, mode
| PTRACE_MODE_FSCREDS
);
791 put_task_struct(task
);
793 if (!IS_ERR_OR_NULL(mm
)) {
794 /* ensure this mm_struct can't be freed */
796 /* but do not pin its memory */
804 static int __mem_open(struct inode
*inode
, struct file
*file
, unsigned int mode
)
806 struct mm_struct
*mm
= proc_mem_open(inode
, mode
);
811 file
->private_data
= mm
;
815 static int mem_open(struct inode
*inode
, struct file
*file
)
817 int ret
= __mem_open(inode
, file
, PTRACE_MODE_ATTACH
);
819 /* OK to pass negative loff_t, we can catch out-of-range */
820 file
->f_mode
|= FMODE_UNSIGNED_OFFSET
;
825 static ssize_t
mem_rw(struct file
*file
, char __user
*buf
,
826 size_t count
, loff_t
*ppos
, int write
)
828 struct mm_struct
*mm
= file
->private_data
;
829 unsigned long addr
= *ppos
;
837 page
= (char *)__get_free_page(GFP_KERNEL
);
842 if (!mmget_not_zero(mm
))
845 flags
= FOLL_FORCE
| (write
? FOLL_WRITE
: 0);
848 size_t this_len
= min_t(size_t, count
, PAGE_SIZE
);
850 if (write
&& copy_from_user(page
, buf
, this_len
)) {
855 this_len
= access_remote_vm(mm
, addr
, page
, this_len
, flags
);
862 if (!write
&& copy_to_user(buf
, page
, this_len
)) {
876 free_page((unsigned long) page
);
880 static ssize_t
mem_read(struct file
*file
, char __user
*buf
,
881 size_t count
, loff_t
*ppos
)
883 return mem_rw(file
, buf
, count
, ppos
, 0);
886 static ssize_t
mem_write(struct file
*file
, const char __user
*buf
,
887 size_t count
, loff_t
*ppos
)
889 return mem_rw(file
, (char __user
*)buf
, count
, ppos
, 1);
892 loff_t
mem_lseek(struct file
*file
, loff_t offset
, int orig
)
896 file
->f_pos
= offset
;
899 file
->f_pos
+= offset
;
904 force_successful_syscall_return();
908 static int mem_release(struct inode
*inode
, struct file
*file
)
910 struct mm_struct
*mm
= file
->private_data
;
916 static const struct file_operations proc_mem_operations
= {
921 .release
= mem_release
,
924 static int environ_open(struct inode
*inode
, struct file
*file
)
926 return __mem_open(inode
, file
, PTRACE_MODE_READ
);
929 static ssize_t
environ_read(struct file
*file
, char __user
*buf
,
930 size_t count
, loff_t
*ppos
)
933 unsigned long src
= *ppos
;
935 struct mm_struct
*mm
= file
->private_data
;
936 unsigned long env_start
, env_end
;
938 /* Ensure the process spawned far enough to have an environment. */
939 if (!mm
|| !mm
->env_end
)
942 page
= (char *)__get_free_page(GFP_KERNEL
);
947 if (!mmget_not_zero(mm
))
950 spin_lock(&mm
->arg_lock
);
951 env_start
= mm
->env_start
;
952 env_end
= mm
->env_end
;
953 spin_unlock(&mm
->arg_lock
);
956 size_t this_len
, max_len
;
959 if (src
>= (env_end
- env_start
))
962 this_len
= env_end
- (env_start
+ src
);
964 max_len
= min_t(size_t, PAGE_SIZE
, count
);
965 this_len
= min(max_len
, this_len
);
967 retval
= access_remote_vm(mm
, (env_start
+ src
), page
, this_len
, FOLL_ANON
);
974 if (copy_to_user(buf
, page
, retval
)) {
988 free_page((unsigned long) page
);
992 static const struct file_operations proc_environ_operations
= {
993 .open
= environ_open
,
994 .read
= environ_read
,
995 .llseek
= generic_file_llseek
,
996 .release
= mem_release
,
999 static int auxv_open(struct inode
*inode
, struct file
*file
)
1001 return __mem_open(inode
, file
, PTRACE_MODE_READ_FSCREDS
);
1004 static ssize_t
auxv_read(struct file
*file
, char __user
*buf
,
1005 size_t count
, loff_t
*ppos
)
1007 struct mm_struct
*mm
= file
->private_data
;
1008 unsigned int nwords
= 0;
1014 } while (mm
->saved_auxv
[nwords
- 2] != 0); /* AT_NULL */
1015 return simple_read_from_buffer(buf
, count
, ppos
, mm
->saved_auxv
,
1016 nwords
* sizeof(mm
->saved_auxv
[0]));
1019 static const struct file_operations proc_auxv_operations
= {
1022 .llseek
= generic_file_llseek
,
1023 .release
= mem_release
,
1026 static ssize_t
oom_adj_read(struct file
*file
, char __user
*buf
, size_t count
,
1029 struct task_struct
*task
= get_proc_task(file_inode(file
));
1030 char buffer
[PROC_NUMBUF
];
1031 int oom_adj
= OOM_ADJUST_MIN
;
1036 if (task
->signal
->oom_score_adj
== OOM_SCORE_ADJ_MAX
)
1037 oom_adj
= OOM_ADJUST_MAX
;
1039 oom_adj
= (task
->signal
->oom_score_adj
* -OOM_DISABLE
) /
1041 put_task_struct(task
);
1042 len
= snprintf(buffer
, sizeof(buffer
), "%d\n", oom_adj
);
1043 return simple_read_from_buffer(buf
, count
, ppos
, buffer
, len
);
1046 static int __set_oom_adj(struct file
*file
, int oom_adj
, bool legacy
)
1048 struct mm_struct
*mm
= NULL
;
1049 struct task_struct
*task
;
1052 task
= get_proc_task(file_inode(file
));
1056 mutex_lock(&oom_adj_mutex
);
1058 if (oom_adj
< task
->signal
->oom_score_adj
&&
1059 !capable(CAP_SYS_RESOURCE
)) {
1064 * /proc/pid/oom_adj is provided for legacy purposes, ask users to use
1065 * /proc/pid/oom_score_adj instead.
1067 pr_warn_once("%s (%d): /proc/%d/oom_adj is deprecated, please use /proc/%d/oom_score_adj instead.\n",
1068 current
->comm
, task_pid_nr(current
), task_pid_nr(task
),
1071 if ((short)oom_adj
< task
->signal
->oom_score_adj_min
&&
1072 !capable(CAP_SYS_RESOURCE
)) {
1079 * Make sure we will check other processes sharing the mm if this is
1080 * not vfrok which wants its own oom_score_adj.
1081 * pin the mm so it doesn't go away and get reused after task_unlock
1083 if (!task
->vfork_done
) {
1084 struct task_struct
*p
= find_lock_task_mm(task
);
1087 if (test_bit(MMF_MULTIPROCESS
, &p
->mm
->flags
)) {
1095 task
->signal
->oom_score_adj
= oom_adj
;
1096 if (!legacy
&& has_capability_noaudit(current
, CAP_SYS_RESOURCE
))
1097 task
->signal
->oom_score_adj_min
= (short)oom_adj
;
1098 trace_oom_score_adj_update(task
);
1101 struct task_struct
*p
;
1104 for_each_process(p
) {
1105 if (same_thread_group(task
, p
))
1108 /* do not touch kernel threads or the global init */
1109 if (p
->flags
& PF_KTHREAD
|| is_global_init(p
))
1113 if (!p
->vfork_done
&& process_shares_mm(p
, mm
)) {
1114 p
->signal
->oom_score_adj
= oom_adj
;
1115 if (!legacy
&& has_capability_noaudit(current
, CAP_SYS_RESOURCE
))
1116 p
->signal
->oom_score_adj_min
= (short)oom_adj
;
1124 mutex_unlock(&oom_adj_mutex
);
1125 put_task_struct(task
);
1130 * /proc/pid/oom_adj exists solely for backwards compatibility with previous
1131 * kernels. The effective policy is defined by oom_score_adj, which has a
1132 * different scale: oom_adj grew exponentially and oom_score_adj grows linearly.
1133 * Values written to oom_adj are simply mapped linearly to oom_score_adj.
1134 * Processes that become oom disabled via oom_adj will still be oom disabled
1135 * with this implementation.
1137 * oom_adj cannot be removed since existing userspace binaries use it.
1139 static ssize_t
oom_adj_write(struct file
*file
, const char __user
*buf
,
1140 size_t count
, loff_t
*ppos
)
1142 char buffer
[PROC_NUMBUF
];
1146 memset(buffer
, 0, sizeof(buffer
));
1147 if (count
> sizeof(buffer
) - 1)
1148 count
= sizeof(buffer
) - 1;
1149 if (copy_from_user(buffer
, buf
, count
)) {
1154 err
= kstrtoint(strstrip(buffer
), 0, &oom_adj
);
1157 if ((oom_adj
< OOM_ADJUST_MIN
|| oom_adj
> OOM_ADJUST_MAX
) &&
1158 oom_adj
!= OOM_DISABLE
) {
1164 * Scale /proc/pid/oom_score_adj appropriately ensuring that a maximum
1165 * value is always attainable.
1167 if (oom_adj
== OOM_ADJUST_MAX
)
1168 oom_adj
= OOM_SCORE_ADJ_MAX
;
1170 oom_adj
= (oom_adj
* OOM_SCORE_ADJ_MAX
) / -OOM_DISABLE
;
1172 err
= __set_oom_adj(file
, oom_adj
, true);
1174 return err
< 0 ? err
: count
;
1177 static const struct file_operations proc_oom_adj_operations
= {
1178 .read
= oom_adj_read
,
1179 .write
= oom_adj_write
,
1180 .llseek
= generic_file_llseek
,
1183 static ssize_t
oom_score_adj_read(struct file
*file
, char __user
*buf
,
1184 size_t count
, loff_t
*ppos
)
1186 struct task_struct
*task
= get_proc_task(file_inode(file
));
1187 char buffer
[PROC_NUMBUF
];
1188 short oom_score_adj
= OOM_SCORE_ADJ_MIN
;
1193 oom_score_adj
= task
->signal
->oom_score_adj
;
1194 put_task_struct(task
);
1195 len
= snprintf(buffer
, sizeof(buffer
), "%hd\n", oom_score_adj
);
1196 return simple_read_from_buffer(buf
, count
, ppos
, buffer
, len
);
1199 static ssize_t
oom_score_adj_write(struct file
*file
, const char __user
*buf
,
1200 size_t count
, loff_t
*ppos
)
1202 char buffer
[PROC_NUMBUF
];
1206 memset(buffer
, 0, sizeof(buffer
));
1207 if (count
> sizeof(buffer
) - 1)
1208 count
= sizeof(buffer
) - 1;
1209 if (copy_from_user(buffer
, buf
, count
)) {
1214 err
= kstrtoint(strstrip(buffer
), 0, &oom_score_adj
);
1217 if (oom_score_adj
< OOM_SCORE_ADJ_MIN
||
1218 oom_score_adj
> OOM_SCORE_ADJ_MAX
) {
1223 err
= __set_oom_adj(file
, oom_score_adj
, false);
1225 return err
< 0 ? err
: count
;
1228 static const struct file_operations proc_oom_score_adj_operations
= {
1229 .read
= oom_score_adj_read
,
1230 .write
= oom_score_adj_write
,
1231 .llseek
= default_llseek
,
1235 #define TMPBUFLEN 11
1236 static ssize_t
proc_loginuid_read(struct file
* file
, char __user
* buf
,
1237 size_t count
, loff_t
*ppos
)
1239 struct inode
* inode
= file_inode(file
);
1240 struct task_struct
*task
= get_proc_task(inode
);
1242 char tmpbuf
[TMPBUFLEN
];
1246 length
= scnprintf(tmpbuf
, TMPBUFLEN
, "%u",
1247 from_kuid(file
->f_cred
->user_ns
,
1248 audit_get_loginuid(task
)));
1249 put_task_struct(task
);
1250 return simple_read_from_buffer(buf
, count
, ppos
, tmpbuf
, length
);
1253 static ssize_t
proc_loginuid_write(struct file
* file
, const char __user
* buf
,
1254 size_t count
, loff_t
*ppos
)
1256 struct inode
* inode
= file_inode(file
);
1262 if (current
!= pid_task(proc_pid(inode
), PIDTYPE_PID
)) {
1269 /* No partial writes. */
1273 rv
= kstrtou32_from_user(buf
, count
, 10, &loginuid
);
1277 /* is userspace tring to explicitly UNSET the loginuid? */
1278 if (loginuid
== AUDIT_UID_UNSET
) {
1279 kloginuid
= INVALID_UID
;
1281 kloginuid
= make_kuid(file
->f_cred
->user_ns
, loginuid
);
1282 if (!uid_valid(kloginuid
))
1286 rv
= audit_set_loginuid(kloginuid
);
1292 static const struct file_operations proc_loginuid_operations
= {
1293 .read
= proc_loginuid_read
,
1294 .write
= proc_loginuid_write
,
1295 .llseek
= generic_file_llseek
,
1298 static ssize_t
proc_sessionid_read(struct file
* file
, char __user
* buf
,
1299 size_t count
, loff_t
*ppos
)
1301 struct inode
* inode
= file_inode(file
);
1302 struct task_struct
*task
= get_proc_task(inode
);
1304 char tmpbuf
[TMPBUFLEN
];
1308 length
= scnprintf(tmpbuf
, TMPBUFLEN
, "%u",
1309 audit_get_sessionid(task
));
1310 put_task_struct(task
);
1311 return simple_read_from_buffer(buf
, count
, ppos
, tmpbuf
, length
);
1314 static const struct file_operations proc_sessionid_operations
= {
1315 .read
= proc_sessionid_read
,
1316 .llseek
= generic_file_llseek
,
1320 #ifdef CONFIG_FAULT_INJECTION
1321 static ssize_t
proc_fault_inject_read(struct file
* file
, char __user
* buf
,
1322 size_t count
, loff_t
*ppos
)
1324 struct task_struct
*task
= get_proc_task(file_inode(file
));
1325 char buffer
[PROC_NUMBUF
];
1331 make_it_fail
= task
->make_it_fail
;
1332 put_task_struct(task
);
1334 len
= snprintf(buffer
, sizeof(buffer
), "%i\n", make_it_fail
);
1336 return simple_read_from_buffer(buf
, count
, ppos
, buffer
, len
);
1339 static ssize_t
proc_fault_inject_write(struct file
* file
,
1340 const char __user
* buf
, size_t count
, loff_t
*ppos
)
1342 struct task_struct
*task
;
1343 char buffer
[PROC_NUMBUF
];
1347 if (!capable(CAP_SYS_RESOURCE
))
1349 memset(buffer
, 0, sizeof(buffer
));
1350 if (count
> sizeof(buffer
) - 1)
1351 count
= sizeof(buffer
) - 1;
1352 if (copy_from_user(buffer
, buf
, count
))
1354 rv
= kstrtoint(strstrip(buffer
), 0, &make_it_fail
);
1357 if (make_it_fail
< 0 || make_it_fail
> 1)
1360 task
= get_proc_task(file_inode(file
));
1363 task
->make_it_fail
= make_it_fail
;
1364 put_task_struct(task
);
1369 static const struct file_operations proc_fault_inject_operations
= {
1370 .read
= proc_fault_inject_read
,
1371 .write
= proc_fault_inject_write
,
1372 .llseek
= generic_file_llseek
,
1375 static ssize_t
proc_fail_nth_write(struct file
*file
, const char __user
*buf
,
1376 size_t count
, loff_t
*ppos
)
1378 struct task_struct
*task
;
1382 err
= kstrtouint_from_user(buf
, count
, 0, &n
);
1386 task
= get_proc_task(file_inode(file
));
1390 put_task_struct(task
);
1395 static ssize_t
proc_fail_nth_read(struct file
*file
, char __user
*buf
,
1396 size_t count
, loff_t
*ppos
)
1398 struct task_struct
*task
;
1399 char numbuf
[PROC_NUMBUF
];
1402 task
= get_proc_task(file_inode(file
));
1405 len
= snprintf(numbuf
, sizeof(numbuf
), "%u\n", task
->fail_nth
);
1406 put_task_struct(task
);
1407 return simple_read_from_buffer(buf
, count
, ppos
, numbuf
, len
);
1410 static const struct file_operations proc_fail_nth_operations
= {
1411 .read
= proc_fail_nth_read
,
1412 .write
= proc_fail_nth_write
,
1417 #ifdef CONFIG_SCHED_DEBUG
1419 * Print out various scheduling related per-task fields:
1421 static int sched_show(struct seq_file
*m
, void *v
)
1423 struct inode
*inode
= m
->private;
1424 struct pid_namespace
*ns
= proc_pid_ns(inode
);
1425 struct task_struct
*p
;
1427 p
= get_proc_task(inode
);
1430 proc_sched_show_task(p
, ns
, m
);
1438 sched_write(struct file
*file
, const char __user
*buf
,
1439 size_t count
, loff_t
*offset
)
1441 struct inode
*inode
= file_inode(file
);
1442 struct task_struct
*p
;
1444 p
= get_proc_task(inode
);
1447 proc_sched_set_task(p
);
1454 static int sched_open(struct inode
*inode
, struct file
*filp
)
1456 return single_open(filp
, sched_show
, inode
);
1459 static const struct file_operations proc_pid_sched_operations
= {
1462 .write
= sched_write
,
1463 .llseek
= seq_lseek
,
1464 .release
= single_release
,
1469 #ifdef CONFIG_SCHED_AUTOGROUP
1471 * Print out autogroup related information:
1473 static int sched_autogroup_show(struct seq_file
*m
, void *v
)
1475 struct inode
*inode
= m
->private;
1476 struct task_struct
*p
;
1478 p
= get_proc_task(inode
);
1481 proc_sched_autogroup_show_task(p
, m
);
1489 sched_autogroup_write(struct file
*file
, const char __user
*buf
,
1490 size_t count
, loff_t
*offset
)
1492 struct inode
*inode
= file_inode(file
);
1493 struct task_struct
*p
;
1494 char buffer
[PROC_NUMBUF
];
1498 memset(buffer
, 0, sizeof(buffer
));
1499 if (count
> sizeof(buffer
) - 1)
1500 count
= sizeof(buffer
) - 1;
1501 if (copy_from_user(buffer
, buf
, count
))
1504 err
= kstrtoint(strstrip(buffer
), 0, &nice
);
1508 p
= get_proc_task(inode
);
1512 err
= proc_sched_autogroup_set_nice(p
, nice
);
1521 static int sched_autogroup_open(struct inode
*inode
, struct file
*filp
)
1525 ret
= single_open(filp
, sched_autogroup_show
, NULL
);
1527 struct seq_file
*m
= filp
->private_data
;
1534 static const struct file_operations proc_pid_sched_autogroup_operations
= {
1535 .open
= sched_autogroup_open
,
1537 .write
= sched_autogroup_write
,
1538 .llseek
= seq_lseek
,
1539 .release
= single_release
,
1542 #endif /* CONFIG_SCHED_AUTOGROUP */
1544 static ssize_t
comm_write(struct file
*file
, const char __user
*buf
,
1545 size_t count
, loff_t
*offset
)
1547 struct inode
*inode
= file_inode(file
);
1548 struct task_struct
*p
;
1549 char buffer
[TASK_COMM_LEN
];
1550 const size_t maxlen
= sizeof(buffer
) - 1;
1552 memset(buffer
, 0, sizeof(buffer
));
1553 if (copy_from_user(buffer
, buf
, count
> maxlen
? maxlen
: count
))
1556 p
= get_proc_task(inode
);
1560 if (same_thread_group(current
, p
))
1561 set_task_comm(p
, buffer
);
1570 static int comm_show(struct seq_file
*m
, void *v
)
1572 struct inode
*inode
= m
->private;
1573 struct task_struct
*p
;
1575 p
= get_proc_task(inode
);
1579 proc_task_name(m
, p
, false);
1587 static int comm_open(struct inode
*inode
, struct file
*filp
)
1589 return single_open(filp
, comm_show
, inode
);
1592 static const struct file_operations proc_pid_set_comm_operations
= {
1595 .write
= comm_write
,
1596 .llseek
= seq_lseek
,
1597 .release
= single_release
,
1600 static int proc_exe_link(struct dentry
*dentry
, struct path
*exe_path
)
1602 struct task_struct
*task
;
1603 struct file
*exe_file
;
1605 task
= get_proc_task(d_inode(dentry
));
1608 exe_file
= get_task_exe_file(task
);
1609 put_task_struct(task
);
1611 *exe_path
= exe_file
->f_path
;
1612 path_get(&exe_file
->f_path
);
1619 static const char *proc_pid_get_link(struct dentry
*dentry
,
1620 struct inode
*inode
,
1621 struct delayed_call
*done
)
1624 int error
= -EACCES
;
1627 return ERR_PTR(-ECHILD
);
1629 /* Are we allowed to snoop on the tasks file descriptors? */
1630 if (!proc_fd_access_allowed(inode
))
1633 error
= PROC_I(inode
)->op
.proc_get_link(dentry
, &path
);
1637 nd_jump_link(&path
);
1640 return ERR_PTR(error
);
1643 static int do_proc_readlink(struct path
*path
, char __user
*buffer
, int buflen
)
1645 char *tmp
= (char *)__get_free_page(GFP_KERNEL
);
1652 pathname
= d_path(path
, tmp
, PAGE_SIZE
);
1653 len
= PTR_ERR(pathname
);
1654 if (IS_ERR(pathname
))
1656 len
= tmp
+ PAGE_SIZE
- 1 - pathname
;
1660 if (copy_to_user(buffer
, pathname
, len
))
1663 free_page((unsigned long)tmp
);
1667 static int proc_pid_readlink(struct dentry
* dentry
, char __user
* buffer
, int buflen
)
1669 int error
= -EACCES
;
1670 struct inode
*inode
= d_inode(dentry
);
1673 /* Are we allowed to snoop on the tasks file descriptors? */
1674 if (!proc_fd_access_allowed(inode
))
1677 error
= PROC_I(inode
)->op
.proc_get_link(dentry
, &path
);
1681 error
= do_proc_readlink(&path
, buffer
, buflen
);
1687 const struct inode_operations proc_pid_link_inode_operations
= {
1688 .readlink
= proc_pid_readlink
,
1689 .get_link
= proc_pid_get_link
,
1690 .setattr
= proc_setattr
,
1694 /* building an inode */
1696 void task_dump_owner(struct task_struct
*task
, umode_t mode
,
1697 kuid_t
*ruid
, kgid_t
*rgid
)
1699 /* Depending on the state of dumpable compute who should own a
1700 * proc file for a task.
1702 const struct cred
*cred
;
1706 if (unlikely(task
->flags
& PF_KTHREAD
)) {
1707 *ruid
= GLOBAL_ROOT_UID
;
1708 *rgid
= GLOBAL_ROOT_GID
;
1712 /* Default to the tasks effective ownership */
1714 cred
= __task_cred(task
);
1720 * Before the /proc/pid/status file was created the only way to read
1721 * the effective uid of a /process was to stat /proc/pid. Reading
1722 * /proc/pid/status is slow enough that procps and other packages
1723 * kept stating /proc/pid. To keep the rules in /proc simple I have
1724 * made this apply to all per process world readable and executable
1727 if (mode
!= (S_IFDIR
|S_IRUGO
|S_IXUGO
)) {
1728 struct mm_struct
*mm
;
1731 /* Make non-dumpable tasks owned by some root */
1733 if (get_dumpable(mm
) != SUID_DUMP_USER
) {
1734 struct user_namespace
*user_ns
= mm
->user_ns
;
1736 uid
= make_kuid(user_ns
, 0);
1737 if (!uid_valid(uid
))
1738 uid
= GLOBAL_ROOT_UID
;
1740 gid
= make_kgid(user_ns
, 0);
1741 if (!gid_valid(gid
))
1742 gid
= GLOBAL_ROOT_GID
;
1745 uid
= GLOBAL_ROOT_UID
;
1746 gid
= GLOBAL_ROOT_GID
;
1754 struct inode
*proc_pid_make_inode(struct super_block
* sb
,
1755 struct task_struct
*task
, umode_t mode
)
1757 struct inode
* inode
;
1758 struct proc_inode
*ei
;
1760 /* We need a new inode */
1762 inode
= new_inode(sb
);
1768 inode
->i_mode
= mode
;
1769 inode
->i_ino
= get_next_ino();
1770 inode
->i_mtime
= inode
->i_atime
= inode
->i_ctime
= current_time(inode
);
1771 inode
->i_op
= &proc_def_inode_operations
;
1774 * grab the reference to task.
1776 ei
->pid
= get_task_pid(task
, PIDTYPE_PID
);
1780 task_dump_owner(task
, 0, &inode
->i_uid
, &inode
->i_gid
);
1781 security_task_to_inode(task
, inode
);
1791 int pid_getattr(const struct path
*path
, struct kstat
*stat
,
1792 u32 request_mask
, unsigned int query_flags
)
1794 struct inode
*inode
= d_inode(path
->dentry
);
1795 struct pid_namespace
*pid
= proc_pid_ns(inode
);
1796 struct task_struct
*task
;
1798 generic_fillattr(inode
, stat
);
1800 stat
->uid
= GLOBAL_ROOT_UID
;
1801 stat
->gid
= GLOBAL_ROOT_GID
;
1803 task
= pid_task(proc_pid(inode
), PIDTYPE_PID
);
1805 if (!has_pid_permissions(pid
, task
, HIDEPID_INVISIBLE
)) {
1808 * This doesn't prevent learning whether PID exists,
1809 * it only makes getattr() consistent with readdir().
1813 task_dump_owner(task
, inode
->i_mode
, &stat
->uid
, &stat
->gid
);
1822 * Set <pid>/... inode ownership (can change due to setuid(), etc.)
1824 void pid_update_inode(struct task_struct
*task
, struct inode
*inode
)
1826 task_dump_owner(task
, inode
->i_mode
, &inode
->i_uid
, &inode
->i_gid
);
1828 inode
->i_mode
&= ~(S_ISUID
| S_ISGID
);
1829 security_task_to_inode(task
, inode
);
1833 * Rewrite the inode's ownerships here because the owning task may have
1834 * performed a setuid(), etc.
1837 static int pid_revalidate(struct dentry
*dentry
, unsigned int flags
)
1839 struct inode
*inode
;
1840 struct task_struct
*task
;
1842 if (flags
& LOOKUP_RCU
)
1845 inode
= d_inode(dentry
);
1846 task
= get_proc_task(inode
);
1849 pid_update_inode(task
, inode
);
1850 put_task_struct(task
);
1856 static inline bool proc_inode_is_dead(struct inode
*inode
)
1858 return !proc_pid(inode
)->tasks
[PIDTYPE_PID
].first
;
1861 int pid_delete_dentry(const struct dentry
*dentry
)
1863 /* Is the task we represent dead?
1864 * If so, then don't put the dentry on the lru list,
1865 * kill it immediately.
1867 return proc_inode_is_dead(d_inode(dentry
));
1870 const struct dentry_operations pid_dentry_operations
=
1872 .d_revalidate
= pid_revalidate
,
1873 .d_delete
= pid_delete_dentry
,
1879 * Fill a directory entry.
1881 * If possible create the dcache entry and derive our inode number and
1882 * file type from dcache entry.
1884 * Since all of the proc inode numbers are dynamically generated, the inode
1885 * numbers do not exist until the inode is cache. This means creating the
1886 * the dcache entry in readdir is necessary to keep the inode numbers
1887 * reported by readdir in sync with the inode numbers reported
1890 bool proc_fill_cache(struct file
*file
, struct dir_context
*ctx
,
1891 const char *name
, unsigned int len
,
1892 instantiate_t instantiate
, struct task_struct
*task
, const void *ptr
)
1894 struct dentry
*child
, *dir
= file
->f_path
.dentry
;
1895 struct qstr qname
= QSTR_INIT(name
, len
);
1896 struct inode
*inode
;
1897 unsigned type
= DT_UNKNOWN
;
1900 child
= d_hash_and_lookup(dir
, &qname
);
1902 DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq
);
1903 child
= d_alloc_parallel(dir
, &qname
, &wq
);
1905 goto end_instantiate
;
1906 if (d_in_lookup(child
)) {
1908 res
= instantiate(child
, task
, ptr
);
1909 d_lookup_done(child
);
1910 if (unlikely(res
)) {
1914 goto end_instantiate
;
1918 inode
= d_inode(child
);
1920 type
= inode
->i_mode
>> 12;
1923 return dir_emit(ctx
, name
, len
, ino
, type
);
1927 * dname_to_vma_addr - maps a dentry name into two unsigned longs
1928 * which represent vma start and end addresses.
1930 static int dname_to_vma_addr(struct dentry
*dentry
,
1931 unsigned long *start
, unsigned long *end
)
1933 const char *str
= dentry
->d_name
.name
;
1934 unsigned long long sval
, eval
;
1937 if (str
[0] == '0' && str
[1] != '-')
1939 len
= _parse_integer(str
, 16, &sval
);
1940 if (len
& KSTRTOX_OVERFLOW
)
1942 if (sval
!= (unsigned long)sval
)
1950 if (str
[0] == '0' && str
[1])
1952 len
= _parse_integer(str
, 16, &eval
);
1953 if (len
& KSTRTOX_OVERFLOW
)
1955 if (eval
!= (unsigned long)eval
)
1968 static int map_files_d_revalidate(struct dentry
*dentry
, unsigned int flags
)
1970 unsigned long vm_start
, vm_end
;
1971 bool exact_vma_exists
= false;
1972 struct mm_struct
*mm
= NULL
;
1973 struct task_struct
*task
;
1974 struct inode
*inode
;
1977 if (flags
& LOOKUP_RCU
)
1980 inode
= d_inode(dentry
);
1981 task
= get_proc_task(inode
);
1985 mm
= mm_access(task
, PTRACE_MODE_READ_FSCREDS
);
1986 if (IS_ERR_OR_NULL(mm
))
1989 if (!dname_to_vma_addr(dentry
, &vm_start
, &vm_end
)) {
1990 status
= down_read_killable(&mm
->mmap_sem
);
1992 exact_vma_exists
= !!find_exact_vma(mm
, vm_start
,
1994 up_read(&mm
->mmap_sem
);
2000 if (exact_vma_exists
) {
2001 task_dump_owner(task
, 0, &inode
->i_uid
, &inode
->i_gid
);
2003 security_task_to_inode(task
, inode
);
2008 put_task_struct(task
);
2014 static const struct dentry_operations tid_map_files_dentry_operations
= {
2015 .d_revalidate
= map_files_d_revalidate
,
2016 .d_delete
= pid_delete_dentry
,
2019 static int map_files_get_link(struct dentry
*dentry
, struct path
*path
)
2021 unsigned long vm_start
, vm_end
;
2022 struct vm_area_struct
*vma
;
2023 struct task_struct
*task
;
2024 struct mm_struct
*mm
;
2028 task
= get_proc_task(d_inode(dentry
));
2032 mm
= get_task_mm(task
);
2033 put_task_struct(task
);
2037 rc
= dname_to_vma_addr(dentry
, &vm_start
, &vm_end
);
2041 rc
= down_read_killable(&mm
->mmap_sem
);
2046 vma
= find_exact_vma(mm
, vm_start
, vm_end
);
2047 if (vma
&& vma
->vm_file
) {
2048 *path
= vma_pr_or_file(vma
)->f_path
;
2052 up_read(&mm
->mmap_sem
);
2060 struct map_files_info
{
2061 unsigned long start
;
2067 * Only allow CAP_SYS_ADMIN to follow the links, due to concerns about how the
2068 * symlinks may be used to bypass permissions on ancestor directories in the
2069 * path to the file in question.
2072 proc_map_files_get_link(struct dentry
*dentry
,
2073 struct inode
*inode
,
2074 struct delayed_call
*done
)
2076 if (!capable(CAP_SYS_ADMIN
))
2077 return ERR_PTR(-EPERM
);
2079 return proc_pid_get_link(dentry
, inode
, done
);
2083 * Identical to proc_pid_link_inode_operations except for get_link()
2085 static const struct inode_operations proc_map_files_link_inode_operations
= {
2086 .readlink
= proc_pid_readlink
,
2087 .get_link
= proc_map_files_get_link
,
2088 .setattr
= proc_setattr
,
2091 static struct dentry
*
2092 proc_map_files_instantiate(struct dentry
*dentry
,
2093 struct task_struct
*task
, const void *ptr
)
2095 fmode_t mode
= (fmode_t
)(unsigned long)ptr
;
2096 struct proc_inode
*ei
;
2097 struct inode
*inode
;
2099 inode
= proc_pid_make_inode(dentry
->d_sb
, task
, S_IFLNK
|
2100 ((mode
& FMODE_READ
) ? S_IRUSR
: 0) |
2101 ((mode
& FMODE_WRITE
) ? S_IWUSR
: 0));
2103 return ERR_PTR(-ENOENT
);
2106 ei
->op
.proc_get_link
= map_files_get_link
;
2108 inode
->i_op
= &proc_map_files_link_inode_operations
;
2111 d_set_d_op(dentry
, &tid_map_files_dentry_operations
);
2112 return d_splice_alias(inode
, dentry
);
2115 static struct dentry
*proc_map_files_lookup(struct inode
*dir
,
2116 struct dentry
*dentry
, unsigned int flags
)
2118 unsigned long vm_start
, vm_end
;
2119 struct vm_area_struct
*vma
;
2120 struct task_struct
*task
;
2121 struct dentry
*result
;
2122 struct mm_struct
*mm
;
2124 result
= ERR_PTR(-ENOENT
);
2125 task
= get_proc_task(dir
);
2129 result
= ERR_PTR(-EACCES
);
2130 if (!ptrace_may_access(task
, PTRACE_MODE_READ_FSCREDS
))
2133 result
= ERR_PTR(-ENOENT
);
2134 if (dname_to_vma_addr(dentry
, &vm_start
, &vm_end
))
2137 mm
= get_task_mm(task
);
2141 result
= ERR_PTR(-EINTR
);
2142 if (down_read_killable(&mm
->mmap_sem
))
2145 result
= ERR_PTR(-ENOENT
);
2146 vma
= find_exact_vma(mm
, vm_start
, vm_end
);
2151 result
= proc_map_files_instantiate(dentry
, task
,
2152 (void *)(unsigned long)vma
->vm_file
->f_mode
);
2155 up_read(&mm
->mmap_sem
);
2159 put_task_struct(task
);
2164 static const struct inode_operations proc_map_files_inode_operations
= {
2165 .lookup
= proc_map_files_lookup
,
2166 .permission
= proc_fd_permission
,
2167 .setattr
= proc_setattr
,
2171 proc_map_files_readdir(struct file
*file
, struct dir_context
*ctx
)
2173 struct vm_area_struct
*vma
;
2174 struct task_struct
*task
;
2175 struct mm_struct
*mm
;
2176 unsigned long nr_files
, pos
, i
;
2177 GENRADIX(struct map_files_info
) fa
;
2178 struct map_files_info
*p
;
2184 task
= get_proc_task(file_inode(file
));
2189 if (!ptrace_may_access(task
, PTRACE_MODE_READ_FSCREDS
))
2193 if (!dir_emit_dots(file
, ctx
))
2196 mm
= get_task_mm(task
);
2200 ret
= down_read_killable(&mm
->mmap_sem
);
2209 * We need two passes here:
2211 * 1) Collect vmas of mapped files with mmap_sem taken
2212 * 2) Release mmap_sem and instantiate entries
2214 * otherwise we get lockdep complained, since filldir()
2215 * routine might require mmap_sem taken in might_fault().
2218 for (vma
= mm
->mmap
, pos
= 2; vma
; vma
= vma
->vm_next
) {
2221 if (++pos
<= ctx
->pos
)
2224 p
= genradix_ptr_alloc(&fa
, nr_files
++, GFP_KERNEL
);
2227 up_read(&mm
->mmap_sem
);
2232 p
->start
= vma
->vm_start
;
2233 p
->end
= vma
->vm_end
;
2234 p
->mode
= vma
->vm_file
->f_mode
;
2236 up_read(&mm
->mmap_sem
);
2239 for (i
= 0; i
< nr_files
; i
++) {
2240 char buf
[4 * sizeof(long) + 2]; /* max: %lx-%lx\0 */
2243 p
= genradix_ptr(&fa
, i
);
2244 len
= snprintf(buf
, sizeof(buf
), "%lx-%lx", p
->start
, p
->end
);
2245 if (!proc_fill_cache(file
, ctx
,
2247 proc_map_files_instantiate
,
2249 (void *)(unsigned long)p
->mode
))
2255 put_task_struct(task
);
2261 static const struct file_operations proc_map_files_operations
= {
2262 .read
= generic_read_dir
,
2263 .iterate_shared
= proc_map_files_readdir
,
2264 .llseek
= generic_file_llseek
,
2267 #if defined(CONFIG_CHECKPOINT_RESTORE) && defined(CONFIG_POSIX_TIMERS)
2268 struct timers_private
{
2270 struct task_struct
*task
;
2271 struct sighand_struct
*sighand
;
2272 struct pid_namespace
*ns
;
2273 unsigned long flags
;
2276 static void *timers_start(struct seq_file
*m
, loff_t
*pos
)
2278 struct timers_private
*tp
= m
->private;
2280 tp
->task
= get_pid_task(tp
->pid
, PIDTYPE_PID
);
2282 return ERR_PTR(-ESRCH
);
2284 tp
->sighand
= lock_task_sighand(tp
->task
, &tp
->flags
);
2286 return ERR_PTR(-ESRCH
);
2288 return seq_list_start(&tp
->task
->signal
->posix_timers
, *pos
);
2291 static void *timers_next(struct seq_file
*m
, void *v
, loff_t
*pos
)
2293 struct timers_private
*tp
= m
->private;
2294 return seq_list_next(v
, &tp
->task
->signal
->posix_timers
, pos
);
2297 static void timers_stop(struct seq_file
*m
, void *v
)
2299 struct timers_private
*tp
= m
->private;
2302 unlock_task_sighand(tp
->task
, &tp
->flags
);
2307 put_task_struct(tp
->task
);
2312 static int show_timer(struct seq_file
*m
, void *v
)
2314 struct k_itimer
*timer
;
2315 struct timers_private
*tp
= m
->private;
2317 static const char * const nstr
[] = {
2318 [SIGEV_SIGNAL
] = "signal",
2319 [SIGEV_NONE
] = "none",
2320 [SIGEV_THREAD
] = "thread",
2323 timer
= list_entry((struct list_head
*)v
, struct k_itimer
, list
);
2324 notify
= timer
->it_sigev_notify
;
2326 seq_printf(m
, "ID: %d\n", timer
->it_id
);
2327 seq_printf(m
, "signal: %d/%px\n",
2328 timer
->sigq
->info
.si_signo
,
2329 timer
->sigq
->info
.si_value
.sival_ptr
);
2330 seq_printf(m
, "notify: %s/%s.%d\n",
2331 nstr
[notify
& ~SIGEV_THREAD_ID
],
2332 (notify
& SIGEV_THREAD_ID
) ? "tid" : "pid",
2333 pid_nr_ns(timer
->it_pid
, tp
->ns
));
2334 seq_printf(m
, "ClockID: %d\n", timer
->it_clock
);
2339 static const struct seq_operations proc_timers_seq_ops
= {
2340 .start
= timers_start
,
2341 .next
= timers_next
,
2342 .stop
= timers_stop
,
2346 static int proc_timers_open(struct inode
*inode
, struct file
*file
)
2348 struct timers_private
*tp
;
2350 tp
= __seq_open_private(file
, &proc_timers_seq_ops
,
2351 sizeof(struct timers_private
));
2355 tp
->pid
= proc_pid(inode
);
2356 tp
->ns
= proc_pid_ns(inode
);
2360 static const struct file_operations proc_timers_operations
= {
2361 .open
= proc_timers_open
,
2363 .llseek
= seq_lseek
,
2364 .release
= seq_release_private
,
2368 static ssize_t
timerslack_ns_write(struct file
*file
, const char __user
*buf
,
2369 size_t count
, loff_t
*offset
)
2371 struct inode
*inode
= file_inode(file
);
2372 struct task_struct
*p
;
2376 err
= kstrtoull_from_user(buf
, count
, 10, &slack_ns
);
2380 p
= get_proc_task(inode
);
2386 if (!ns_capable(__task_cred(p
)->user_ns
, CAP_SYS_NICE
)) {
2393 err
= security_task_setscheduler(p
);
2402 p
->timer_slack_ns
= p
->default_timer_slack_ns
;
2404 p
->timer_slack_ns
= slack_ns
;
2413 static int timerslack_ns_show(struct seq_file
*m
, void *v
)
2415 struct inode
*inode
= m
->private;
2416 struct task_struct
*p
;
2419 p
= get_proc_task(inode
);
2425 if (!ns_capable(__task_cred(p
)->user_ns
, CAP_SYS_NICE
)) {
2432 err
= security_task_getscheduler(p
);
2438 seq_printf(m
, "%llu\n", p
->timer_slack_ns
);
2447 static int timerslack_ns_open(struct inode
*inode
, struct file
*filp
)
2449 return single_open(filp
, timerslack_ns_show
, inode
);
2452 static const struct file_operations proc_pid_set_timerslack_ns_operations
= {
2453 .open
= timerslack_ns_open
,
2455 .write
= timerslack_ns_write
,
2456 .llseek
= seq_lseek
,
2457 .release
= single_release
,
2460 static struct dentry
*proc_pident_instantiate(struct dentry
*dentry
,
2461 struct task_struct
*task
, const void *ptr
)
2463 const struct pid_entry
*p
= ptr
;
2464 struct inode
*inode
;
2465 struct proc_inode
*ei
;
2467 inode
= proc_pid_make_inode(dentry
->d_sb
, task
, p
->mode
);
2469 return ERR_PTR(-ENOENT
);
2472 if (S_ISDIR(inode
->i_mode
))
2473 set_nlink(inode
, 2); /* Use getattr to fix if necessary */
2475 inode
->i_op
= p
->iop
;
2477 inode
->i_fop
= p
->fop
;
2479 pid_update_inode(task
, inode
);
2480 d_set_d_op(dentry
, &pid_dentry_operations
);
2481 return d_splice_alias(inode
, dentry
);
2484 static struct dentry
*proc_pident_lookup(struct inode
*dir
,
2485 struct dentry
*dentry
,
2486 const struct pid_entry
*p
,
2487 const struct pid_entry
*end
)
2489 struct task_struct
*task
= get_proc_task(dir
);
2490 struct dentry
*res
= ERR_PTR(-ENOENT
);
2496 * Yes, it does not scale. And it should not. Don't add
2497 * new entries into /proc/<tgid>/ without very good reasons.
2499 for (; p
< end
; p
++) {
2500 if (p
->len
!= dentry
->d_name
.len
)
2502 if (!memcmp(dentry
->d_name
.name
, p
->name
, p
->len
)) {
2503 res
= proc_pident_instantiate(dentry
, task
, p
);
2507 put_task_struct(task
);
2512 static int proc_pident_readdir(struct file
*file
, struct dir_context
*ctx
,
2513 const struct pid_entry
*ents
, unsigned int nents
)
2515 struct task_struct
*task
= get_proc_task(file_inode(file
));
2516 const struct pid_entry
*p
;
2521 if (!dir_emit_dots(file
, ctx
))
2524 if (ctx
->pos
>= nents
+ 2)
2527 for (p
= ents
+ (ctx
->pos
- 2); p
< ents
+ nents
; p
++) {
2528 if (!proc_fill_cache(file
, ctx
, p
->name
, p
->len
,
2529 proc_pident_instantiate
, task
, p
))
2534 put_task_struct(task
);
2538 #ifdef CONFIG_SECURITY
2539 static int proc_pid_attr_open(struct inode
*inode
, struct file
*file
)
2541 file
->private_data
= NULL
;
2542 __mem_open(inode
, file
, PTRACE_MODE_READ_FSCREDS
);
2546 static ssize_t
proc_pid_attr_read(struct file
* file
, char __user
* buf
,
2547 size_t count
, loff_t
*ppos
)
2549 struct inode
* inode
= file_inode(file
);
2552 struct task_struct
*task
= get_proc_task(inode
);
2557 length
= security_getprocattr(task
, PROC_I(inode
)->op
.lsm
,
2558 (char*)file
->f_path
.dentry
->d_name
.name
,
2560 put_task_struct(task
);
2562 length
= simple_read_from_buffer(buf
, count
, ppos
, p
, length
);
2567 static ssize_t
proc_pid_attr_write(struct file
* file
, const char __user
* buf
,
2568 size_t count
, loff_t
*ppos
)
2570 struct inode
* inode
= file_inode(file
);
2571 struct task_struct
*task
;
2575 /* A task may only write when it was the opener. */
2576 if (file
->private_data
!= current
->mm
)
2580 task
= pid_task(proc_pid(inode
), PIDTYPE_PID
);
2585 /* A task may only write its own attributes. */
2586 if (current
!= task
) {
2590 /* Prevent changes to overridden credentials. */
2591 if (current_cred() != current_real_cred()) {
2597 if (count
> PAGE_SIZE
)
2600 /* No partial writes. */
2604 page
= memdup_user(buf
, count
);
2610 /* Guard against adverse ptrace interaction */
2611 rv
= mutex_lock_interruptible(¤t
->signal
->cred_guard_mutex
);
2615 rv
= security_setprocattr(PROC_I(inode
)->op
.lsm
,
2616 file
->f_path
.dentry
->d_name
.name
, page
,
2618 mutex_unlock(¤t
->signal
->cred_guard_mutex
);
2625 static const struct file_operations proc_pid_attr_operations
= {
2626 .open
= proc_pid_attr_open
,
2627 .read
= proc_pid_attr_read
,
2628 .write
= proc_pid_attr_write
,
2629 .llseek
= generic_file_llseek
,
2630 .release
= mem_release
,
2633 #define LSM_DIR_OPS(LSM) \
2634 static int proc_##LSM##_attr_dir_iterate(struct file *filp, \
2635 struct dir_context *ctx) \
2637 return proc_pident_readdir(filp, ctx, \
2638 LSM##_attr_dir_stuff, \
2639 ARRAY_SIZE(LSM##_attr_dir_stuff)); \
2642 static const struct file_operations proc_##LSM##_attr_dir_ops = { \
2643 .read = generic_read_dir, \
2644 .iterate = proc_##LSM##_attr_dir_iterate, \
2645 .llseek = default_llseek, \
2648 static struct dentry *proc_##LSM##_attr_dir_lookup(struct inode *dir, \
2649 struct dentry *dentry, unsigned int flags) \
2651 return proc_pident_lookup(dir, dentry, \
2652 LSM##_attr_dir_stuff, \
2653 LSM##_attr_dir_stuff + ARRAY_SIZE(LSM##_attr_dir_stuff)); \
2656 static const struct inode_operations proc_##LSM##_attr_dir_inode_ops = { \
2657 .lookup = proc_##LSM##_attr_dir_lookup, \
2658 .getattr = pid_getattr, \
2659 .setattr = proc_setattr, \
2662 #ifdef CONFIG_SECURITY_SMACK
2663 static const struct pid_entry smack_attr_dir_stuff
[] = {
2664 ATTR("smack", "current", 0666),
2669 #ifdef CONFIG_SECURITY_APPARMOR
2670 static const struct pid_entry apparmor_attr_dir_stuff
[] = {
2671 ATTR("apparmor", "current", 0666),
2672 ATTR("apparmor", "prev", 0444),
2673 ATTR("apparmor", "exec", 0666),
2675 LSM_DIR_OPS(apparmor
);
2678 static const struct pid_entry attr_dir_stuff
[] = {
2679 ATTR(NULL
, "current", 0666),
2680 ATTR(NULL
, "prev", 0444),
2681 ATTR(NULL
, "exec", 0666),
2682 ATTR(NULL
, "fscreate", 0666),
2683 ATTR(NULL
, "keycreate", 0666),
2684 ATTR(NULL
, "sockcreate", 0666),
2685 ATTR(NULL
, "display", 0666),
2686 #ifdef CONFIG_SECURITY_SMACK
2688 proc_smack_attr_dir_inode_ops
, proc_smack_attr_dir_ops
),
2690 #ifdef CONFIG_SECURITY_APPARMOR
2691 DIR("apparmor", 0555,
2692 proc_apparmor_attr_dir_inode_ops
, proc_apparmor_attr_dir_ops
),
2696 static int proc_attr_dir_readdir(struct file
*file
, struct dir_context
*ctx
)
2698 return proc_pident_readdir(file
, ctx
,
2699 attr_dir_stuff
, ARRAY_SIZE(attr_dir_stuff
));
2702 static const struct file_operations proc_attr_dir_operations
= {
2703 .read
= generic_read_dir
,
2704 .iterate_shared
= proc_attr_dir_readdir
,
2705 .llseek
= generic_file_llseek
,
2708 static struct dentry
*proc_attr_dir_lookup(struct inode
*dir
,
2709 struct dentry
*dentry
, unsigned int flags
)
2711 return proc_pident_lookup(dir
, dentry
,
2713 attr_dir_stuff
+ ARRAY_SIZE(attr_dir_stuff
));
2716 static const struct inode_operations proc_attr_dir_inode_operations
= {
2717 .lookup
= proc_attr_dir_lookup
,
2718 .getattr
= pid_getattr
,
2719 .setattr
= proc_setattr
,
2724 #ifdef CONFIG_ELF_CORE
2725 static ssize_t
proc_coredump_filter_read(struct file
*file
, char __user
*buf
,
2726 size_t count
, loff_t
*ppos
)
2728 struct task_struct
*task
= get_proc_task(file_inode(file
));
2729 struct mm_struct
*mm
;
2730 char buffer
[PROC_NUMBUF
];
2738 mm
= get_task_mm(task
);
2740 len
= snprintf(buffer
, sizeof(buffer
), "%08lx\n",
2741 ((mm
->flags
& MMF_DUMP_FILTER_MASK
) >>
2742 MMF_DUMP_FILTER_SHIFT
));
2744 ret
= simple_read_from_buffer(buf
, count
, ppos
, buffer
, len
);
2747 put_task_struct(task
);
2752 static ssize_t
proc_coredump_filter_write(struct file
*file
,
2753 const char __user
*buf
,
2757 struct task_struct
*task
;
2758 struct mm_struct
*mm
;
2764 ret
= kstrtouint_from_user(buf
, count
, 0, &val
);
2769 task
= get_proc_task(file_inode(file
));
2773 mm
= get_task_mm(task
);
2778 for (i
= 0, mask
= 1; i
< MMF_DUMP_FILTER_BITS
; i
++, mask
<<= 1) {
2780 set_bit(i
+ MMF_DUMP_FILTER_SHIFT
, &mm
->flags
);
2782 clear_bit(i
+ MMF_DUMP_FILTER_SHIFT
, &mm
->flags
);
2787 put_task_struct(task
);
2794 static const struct file_operations proc_coredump_filter_operations
= {
2795 .read
= proc_coredump_filter_read
,
2796 .write
= proc_coredump_filter_write
,
2797 .llseek
= generic_file_llseek
,
2801 #ifdef CONFIG_TASK_IO_ACCOUNTING
2802 static int do_io_accounting(struct task_struct
*task
, struct seq_file
*m
, int whole
)
2804 struct task_io_accounting acct
= task
->ioac
;
2805 unsigned long flags
;
2808 result
= down_read_killable(&task
->signal
->exec_update_lock
);
2812 if (!ptrace_may_access(task
, PTRACE_MODE_READ_FSCREDS
)) {
2817 if (whole
&& lock_task_sighand(task
, &flags
)) {
2818 struct task_struct
*t
= task
;
2820 task_io_accounting_add(&acct
, &task
->signal
->ioac
);
2821 while_each_thread(task
, t
)
2822 task_io_accounting_add(&acct
, &t
->ioac
);
2824 unlock_task_sighand(task
, &flags
);
2831 "read_bytes: %llu\n"
2832 "write_bytes: %llu\n"
2833 "cancelled_write_bytes: %llu\n",
2834 (unsigned long long)acct
.rchar
,
2835 (unsigned long long)acct
.wchar
,
2836 (unsigned long long)acct
.syscr
,
2837 (unsigned long long)acct
.syscw
,
2838 (unsigned long long)acct
.read_bytes
,
2839 (unsigned long long)acct
.write_bytes
,
2840 (unsigned long long)acct
.cancelled_write_bytes
);
2844 up_read(&task
->signal
->exec_update_lock
);
2848 static int proc_tid_io_accounting(struct seq_file
*m
, struct pid_namespace
*ns
,
2849 struct pid
*pid
, struct task_struct
*task
)
2851 return do_io_accounting(task
, m
, 0);
2854 static int proc_tgid_io_accounting(struct seq_file
*m
, struct pid_namespace
*ns
,
2855 struct pid
*pid
, struct task_struct
*task
)
2857 return do_io_accounting(task
, m
, 1);
2859 #endif /* CONFIG_TASK_IO_ACCOUNTING */
2861 #ifdef CONFIG_USER_NS
2862 static int proc_id_map_open(struct inode
*inode
, struct file
*file
,
2863 const struct seq_operations
*seq_ops
)
2865 struct user_namespace
*ns
= NULL
;
2866 struct task_struct
*task
;
2867 struct seq_file
*seq
;
2870 task
= get_proc_task(inode
);
2873 ns
= get_user_ns(task_cred_xxx(task
, user_ns
));
2875 put_task_struct(task
);
2880 ret
= seq_open(file
, seq_ops
);
2884 seq
= file
->private_data
;
2894 static int proc_id_map_release(struct inode
*inode
, struct file
*file
)
2896 struct seq_file
*seq
= file
->private_data
;
2897 struct user_namespace
*ns
= seq
->private;
2899 return seq_release(inode
, file
);
2902 static int proc_uid_map_open(struct inode
*inode
, struct file
*file
)
2904 return proc_id_map_open(inode
, file
, &proc_uid_seq_operations
);
2907 static int proc_gid_map_open(struct inode
*inode
, struct file
*file
)
2909 return proc_id_map_open(inode
, file
, &proc_gid_seq_operations
);
2912 static int proc_projid_map_open(struct inode
*inode
, struct file
*file
)
2914 return proc_id_map_open(inode
, file
, &proc_projid_seq_operations
);
2917 static const struct file_operations proc_uid_map_operations
= {
2918 .open
= proc_uid_map_open
,
2919 .write
= proc_uid_map_write
,
2921 .llseek
= seq_lseek
,
2922 .release
= proc_id_map_release
,
2925 static const struct file_operations proc_gid_map_operations
= {
2926 .open
= proc_gid_map_open
,
2927 .write
= proc_gid_map_write
,
2929 .llseek
= seq_lseek
,
2930 .release
= proc_id_map_release
,
2933 static const struct file_operations proc_projid_map_operations
= {
2934 .open
= proc_projid_map_open
,
2935 .write
= proc_projid_map_write
,
2937 .llseek
= seq_lseek
,
2938 .release
= proc_id_map_release
,
2941 static int proc_setgroups_open(struct inode
*inode
, struct file
*file
)
2943 struct user_namespace
*ns
= NULL
;
2944 struct task_struct
*task
;
2948 task
= get_proc_task(inode
);
2951 ns
= get_user_ns(task_cred_xxx(task
, user_ns
));
2953 put_task_struct(task
);
2958 if (file
->f_mode
& FMODE_WRITE
) {
2960 if (!ns_capable(ns
, CAP_SYS_ADMIN
))
2964 ret
= single_open(file
, &proc_setgroups_show
, ns
);
2975 static int proc_setgroups_release(struct inode
*inode
, struct file
*file
)
2977 struct seq_file
*seq
= file
->private_data
;
2978 struct user_namespace
*ns
= seq
->private;
2979 int ret
= single_release(inode
, file
);
2984 static const struct file_operations proc_setgroups_operations
= {
2985 .open
= proc_setgroups_open
,
2986 .write
= proc_setgroups_write
,
2988 .llseek
= seq_lseek
,
2989 .release
= proc_setgroups_release
,
2991 #endif /* CONFIG_USER_NS */
2993 static int proc_pid_personality(struct seq_file
*m
, struct pid_namespace
*ns
,
2994 struct pid
*pid
, struct task_struct
*task
)
2996 int err
= lock_trace(task
);
2998 seq_printf(m
, "%08x\n", task
->personality
);
3004 #ifdef CONFIG_LIVEPATCH
3005 static int proc_pid_patch_state(struct seq_file
*m
, struct pid_namespace
*ns
,
3006 struct pid
*pid
, struct task_struct
*task
)
3008 seq_printf(m
, "%d\n", task
->patch_state
);
3011 #endif /* CONFIG_LIVEPATCH */
3013 #ifdef CONFIG_STACKLEAK_METRICS
3014 static int proc_stack_depth(struct seq_file
*m
, struct pid_namespace
*ns
,
3015 struct pid
*pid
, struct task_struct
*task
)
3017 unsigned long prev_depth
= THREAD_SIZE
-
3018 (task
->prev_lowest_stack
& (THREAD_SIZE
- 1));
3019 unsigned long depth
= THREAD_SIZE
-
3020 (task
->lowest_stack
& (THREAD_SIZE
- 1));
3022 seq_printf(m
, "previous stack depth: %lu\nstack depth: %lu\n",
3026 #endif /* CONFIG_STACKLEAK_METRICS */
3031 static const struct file_operations proc_task_operations
;
3032 static const struct inode_operations proc_task_inode_operations
;
3034 static const struct pid_entry tgid_base_stuff
[] = {
3035 DIR("task", S_IRUGO
|S_IXUGO
, proc_task_inode_operations
, proc_task_operations
),
3036 DIR("fd", S_IRUSR
|S_IXUSR
, proc_fd_inode_operations
, proc_fd_operations
),
3037 DIR("map_files", S_IRUSR
|S_IXUSR
, proc_map_files_inode_operations
, proc_map_files_operations
),
3038 DIR("fdinfo", S_IRUSR
|S_IXUSR
, proc_fdinfo_inode_operations
, proc_fdinfo_operations
),
3039 DIR("ns", S_IRUSR
|S_IXUGO
, proc_ns_dir_inode_operations
, proc_ns_dir_operations
),
3041 DIR("net", S_IRUGO
|S_IXUGO
, proc_net_inode_operations
, proc_net_operations
),
3043 REG("environ", S_IRUSR
, proc_environ_operations
),
3044 REG("auxv", S_IRUSR
, proc_auxv_operations
),
3045 ONE("status", S_IRUGO
, proc_pid_status
),
3046 ONE("personality", S_IRUSR
, proc_pid_personality
),
3047 ONE("limits", S_IRUGO
, proc_pid_limits
),
3048 #ifdef CONFIG_SCHED_DEBUG
3049 REG("sched", S_IRUGO
|S_IWUSR
, proc_pid_sched_operations
),
3051 #ifdef CONFIG_SCHED_AUTOGROUP
3052 REG("autogroup", S_IRUGO
|S_IWUSR
, proc_pid_sched_autogroup_operations
),
3054 REG("comm", S_IRUGO
|S_IWUSR
, proc_pid_set_comm_operations
),
3055 #ifdef CONFIG_HAVE_ARCH_TRACEHOOK
3056 ONE("syscall", S_IRUSR
, proc_pid_syscall
),
3058 REG("cmdline", S_IRUGO
, proc_pid_cmdline_ops
),
3059 ONE("stat", S_IRUGO
, proc_tgid_stat
),
3060 ONE("statm", S_IRUGO
, proc_pid_statm
),
3061 REG("maps", S_IRUGO
, proc_pid_maps_operations
),
3063 REG("numa_maps", S_IRUGO
, proc_pid_numa_maps_operations
),
3065 REG("mem", S_IRUSR
|S_IWUSR
, proc_mem_operations
),
3066 LNK("cwd", proc_cwd_link
),
3067 LNK("root", proc_root_link
),
3068 LNK("exe", proc_exe_link
),
3069 REG("mounts", S_IRUGO
, proc_mounts_operations
),
3070 REG("mountinfo", S_IRUGO
, proc_mountinfo_operations
),
3071 REG("mountstats", S_IRUSR
, proc_mountstats_operations
),
3072 #ifdef CONFIG_PROC_PAGE_MONITOR
3073 REG("clear_refs", S_IWUSR
, proc_clear_refs_operations
),
3074 REG("smaps", S_IRUGO
, proc_pid_smaps_operations
),
3075 REG("smaps_rollup", S_IRUGO
, proc_pid_smaps_rollup_operations
),
3076 REG("pagemap", S_IRUSR
, proc_pagemap_operations
),
3078 #ifdef CONFIG_SECURITY
3079 DIR("attr", S_IRUGO
|S_IXUGO
, proc_attr_dir_inode_operations
, proc_attr_dir_operations
),
3081 #ifdef CONFIG_KALLSYMS
3082 ONE("wchan", S_IRUGO
, proc_pid_wchan
),
3084 #ifdef CONFIG_STACKTRACE
3085 ONE("stack", S_IRUSR
, proc_pid_stack
),
3087 #ifdef CONFIG_SCHED_INFO
3088 ONE("schedstat", S_IRUGO
, proc_pid_schedstat
),
3090 #ifdef CONFIG_LATENCYTOP
3091 REG("latency", S_IRUGO
, proc_lstats_operations
),
3093 #ifdef CONFIG_PROC_PID_CPUSET
3094 ONE("cpuset", S_IRUGO
, proc_cpuset_show
),
3096 #ifdef CONFIG_CGROUPS
3097 ONE("cgroup", S_IRUGO
, proc_cgroup_show
),
3099 ONE("oom_score", S_IRUGO
, proc_oom_score
),
3100 REG("oom_adj", S_IRUGO
|S_IWUSR
, proc_oom_adj_operations
),
3101 REG("oom_score_adj", S_IRUGO
|S_IWUSR
, proc_oom_score_adj_operations
),
3103 REG("loginuid", S_IWUSR
|S_IRUGO
, proc_loginuid_operations
),
3104 REG("sessionid", S_IRUGO
, proc_sessionid_operations
),
3106 #ifdef CONFIG_FAULT_INJECTION
3107 REG("make-it-fail", S_IRUGO
|S_IWUSR
, proc_fault_inject_operations
),
3108 REG("fail-nth", 0644, proc_fail_nth_operations
),
3110 #ifdef CONFIG_ELF_CORE
3111 REG("coredump_filter", S_IRUGO
|S_IWUSR
, proc_coredump_filter_operations
),
3113 #ifdef CONFIG_TASK_IO_ACCOUNTING
3114 ONE("io", S_IRUSR
, proc_tgid_io_accounting
),
3116 #ifdef CONFIG_USER_NS
3117 REG("uid_map", S_IRUGO
|S_IWUSR
, proc_uid_map_operations
),
3118 REG("gid_map", S_IRUGO
|S_IWUSR
, proc_gid_map_operations
),
3119 REG("projid_map", S_IRUGO
|S_IWUSR
, proc_projid_map_operations
),
3120 REG("setgroups", S_IRUGO
|S_IWUSR
, proc_setgroups_operations
),
3122 #if defined(CONFIG_CHECKPOINT_RESTORE) && defined(CONFIG_POSIX_TIMERS)
3123 REG("timers", S_IRUGO
, proc_timers_operations
),
3125 REG("timerslack_ns", S_IRUGO
|S_IWUGO
, proc_pid_set_timerslack_ns_operations
),
3126 #ifdef CONFIG_LIVEPATCH
3127 ONE("patch_state", S_IRUSR
, proc_pid_patch_state
),
3129 #ifdef CONFIG_STACKLEAK_METRICS
3130 ONE("stack_depth", S_IRUGO
, proc_stack_depth
),
3132 #ifdef CONFIG_PROC_PID_ARCH_STATUS
3133 ONE("arch_status", S_IRUGO
, proc_pid_arch_status
),
3137 static int proc_tgid_base_readdir(struct file
*file
, struct dir_context
*ctx
)
3139 return proc_pident_readdir(file
, ctx
,
3140 tgid_base_stuff
, ARRAY_SIZE(tgid_base_stuff
));
3143 static const struct file_operations proc_tgid_base_operations
= {
3144 .read
= generic_read_dir
,
3145 .iterate_shared
= proc_tgid_base_readdir
,
3146 .llseek
= generic_file_llseek
,
3149 struct pid
*tgid_pidfd_to_pid(const struct file
*file
)
3151 if (file
->f_op
!= &proc_tgid_base_operations
)
3152 return ERR_PTR(-EBADF
);
3154 return proc_pid(file_inode(file
));
3157 static struct dentry
*proc_tgid_base_lookup(struct inode
*dir
, struct dentry
*dentry
, unsigned int flags
)
3159 return proc_pident_lookup(dir
, dentry
,
3161 tgid_base_stuff
+ ARRAY_SIZE(tgid_base_stuff
));
3164 static const struct inode_operations proc_tgid_base_inode_operations
= {
3165 .lookup
= proc_tgid_base_lookup
,
3166 .getattr
= pid_getattr
,
3167 .setattr
= proc_setattr
,
3168 .permission
= proc_pid_permission
,
3171 static void proc_flush_task_mnt(struct vfsmount
*mnt
, pid_t pid
, pid_t tgid
)
3173 struct dentry
*dentry
, *leader
, *dir
;
3178 name
.len
= snprintf(buf
, sizeof(buf
), "%u", pid
);
3179 /* no ->d_hash() rejects on procfs */
3180 dentry
= d_hash_and_lookup(mnt
->mnt_root
, &name
);
3182 d_invalidate(dentry
);
3190 name
.len
= snprintf(buf
, sizeof(buf
), "%u", tgid
);
3191 leader
= d_hash_and_lookup(mnt
->mnt_root
, &name
);
3196 name
.len
= strlen(name
.name
);
3197 dir
= d_hash_and_lookup(leader
, &name
);
3199 goto out_put_leader
;
3202 name
.len
= snprintf(buf
, sizeof(buf
), "%u", pid
);
3203 dentry
= d_hash_and_lookup(dir
, &name
);
3205 d_invalidate(dentry
);
3217 * proc_flush_task - Remove dcache entries for @task from the /proc dcache.
3218 * @task: task that should be flushed.
3220 * When flushing dentries from proc, one needs to flush them from global
3221 * proc (proc_mnt) and from all the namespaces' procs this task was seen
3222 * in. This call is supposed to do all of this job.
3224 * Looks in the dcache for
3226 * /proc/@tgid/task/@pid
3227 * if either directory is present flushes it and all of it'ts children
3230 * It is safe and reasonable to cache /proc entries for a task until
3231 * that task exits. After that they just clog up the dcache with
3232 * useless entries, possibly causing useful dcache entries to be
3233 * flushed instead. This routine is proved to flush those useless
3234 * dcache entries at process exit time.
3236 * NOTE: This routine is just an optimization so it does not guarantee
3237 * that no dcache entries will exist at process exit time it
3238 * just makes it very unlikely that any will persist.
3241 void proc_flush_task(struct task_struct
*task
)
3244 struct pid
*pid
, *tgid
;
3247 pid
= task_pid(task
);
3248 tgid
= task_tgid(task
);
3250 for (i
= 0; i
<= pid
->level
; i
++) {
3251 upid
= &pid
->numbers
[i
];
3252 proc_flush_task_mnt(upid
->ns
->proc_mnt
, upid
->nr
,
3253 tgid
->numbers
[i
].nr
);
3257 static struct dentry
*proc_pid_instantiate(struct dentry
* dentry
,
3258 struct task_struct
*task
, const void *ptr
)
3260 struct inode
*inode
;
3262 inode
= proc_pid_make_inode(dentry
->d_sb
, task
, S_IFDIR
| S_IRUGO
| S_IXUGO
);
3264 return ERR_PTR(-ENOENT
);
3266 inode
->i_op
= &proc_tgid_base_inode_operations
;
3267 inode
->i_fop
= &proc_tgid_base_operations
;
3268 inode
->i_flags
|=S_IMMUTABLE
;
3270 set_nlink(inode
, nlink_tgid
);
3271 pid_update_inode(task
, inode
);
3273 d_set_d_op(dentry
, &pid_dentry_operations
);
3274 return d_splice_alias(inode
, dentry
);
3277 struct dentry
*proc_pid_lookup(struct dentry
*dentry
, unsigned int flags
)
3279 struct task_struct
*task
;
3281 struct pid_namespace
*ns
;
3282 struct dentry
*result
= ERR_PTR(-ENOENT
);
3284 tgid
= name_to_int(&dentry
->d_name
);
3288 ns
= dentry
->d_sb
->s_fs_info
;
3290 task
= find_task_by_pid_ns(tgid
, ns
);
3292 get_task_struct(task
);
3297 result
= proc_pid_instantiate(dentry
, task
, NULL
);
3298 put_task_struct(task
);
3304 * Find the first task with tgid >= tgid
3309 struct task_struct
*task
;
3311 static struct tgid_iter
next_tgid(struct pid_namespace
*ns
, struct tgid_iter iter
)
3316 put_task_struct(iter
.task
);
3320 pid
= find_ge_pid(iter
.tgid
, ns
);
3322 iter
.tgid
= pid_nr_ns(pid
, ns
);
3323 iter
.task
= pid_task(pid
, PIDTYPE_PID
);
3324 /* What we to know is if the pid we have find is the
3325 * pid of a thread_group_leader. Testing for task
3326 * being a thread_group_leader is the obvious thing
3327 * todo but there is a window when it fails, due to
3328 * the pid transfer logic in de_thread.
3330 * So we perform the straight forward test of seeing
3331 * if the pid we have found is the pid of a thread
3332 * group leader, and don't worry if the task we have
3333 * found doesn't happen to be a thread group leader.
3334 * As we don't care in the case of readdir.
3336 if (!iter
.task
|| !has_group_leader_pid(iter
.task
)) {
3340 get_task_struct(iter
.task
);
3346 #define TGID_OFFSET (FIRST_PROCESS_ENTRY + 2)
3348 /* for the /proc/ directory itself, after non-process stuff has been done */
3349 int proc_pid_readdir(struct file
*file
, struct dir_context
*ctx
)
3351 struct tgid_iter iter
;
3352 struct pid_namespace
*ns
= proc_pid_ns(file_inode(file
));
3353 loff_t pos
= ctx
->pos
;
3355 if (pos
>= PID_MAX_LIMIT
+ TGID_OFFSET
)
3358 if (pos
== TGID_OFFSET
- 2) {
3359 struct inode
*inode
= d_inode(ns
->proc_self
);
3360 if (!dir_emit(ctx
, "self", 4, inode
->i_ino
, DT_LNK
))
3362 ctx
->pos
= pos
= pos
+ 1;
3364 if (pos
== TGID_OFFSET
- 1) {
3365 struct inode
*inode
= d_inode(ns
->proc_thread_self
);
3366 if (!dir_emit(ctx
, "thread-self", 11, inode
->i_ino
, DT_LNK
))
3368 ctx
->pos
= pos
= pos
+ 1;
3370 iter
.tgid
= pos
- TGID_OFFSET
;
3372 for (iter
= next_tgid(ns
, iter
);
3374 iter
.tgid
+= 1, iter
= next_tgid(ns
, iter
)) {
3379 if (!has_pid_permissions(ns
, iter
.task
, HIDEPID_INVISIBLE
))
3382 len
= snprintf(name
, sizeof(name
), "%u", iter
.tgid
);
3383 ctx
->pos
= iter
.tgid
+ TGID_OFFSET
;
3384 if (!proc_fill_cache(file
, ctx
, name
, len
,
3385 proc_pid_instantiate
, iter
.task
, NULL
)) {
3386 put_task_struct(iter
.task
);
3390 ctx
->pos
= PID_MAX_LIMIT
+ TGID_OFFSET
;
3395 * proc_tid_comm_permission is a special permission function exclusively
3396 * used for the node /proc/<pid>/task/<tid>/comm.
3397 * It bypasses generic permission checks in the case where a task of the same
3398 * task group attempts to access the node.
3399 * The rationale behind this is that glibc and bionic access this node for
3400 * cross thread naming (pthread_set/getname_np(!self)). However, if
3401 * PR_SET_DUMPABLE gets set to 0 this node among others becomes uid=0 gid=0,
3402 * which locks out the cross thread naming implementation.
3403 * This function makes sure that the node is always accessible for members of
3404 * same thread group.
3406 static int proc_tid_comm_permission(struct inode
*inode
, int mask
)
3408 bool is_same_tgroup
;
3409 struct task_struct
*task
;
3411 task
= get_proc_task(inode
);
3414 is_same_tgroup
= same_thread_group(current
, task
);
3415 put_task_struct(task
);
3417 if (likely(is_same_tgroup
&& !(mask
& MAY_EXEC
))) {
3418 /* This file (/proc/<pid>/task/<tid>/comm) can always be
3419 * read or written by the members of the corresponding
3425 return generic_permission(inode
, mask
);
3428 static const struct inode_operations proc_tid_comm_inode_operations
= {
3429 .permission
= proc_tid_comm_permission
,
3435 static const struct pid_entry tid_base_stuff
[] = {
3436 DIR("fd", S_IRUSR
|S_IXUSR
, proc_fd_inode_operations
, proc_fd_operations
),
3437 DIR("fdinfo", S_IRUSR
|S_IXUSR
, proc_fdinfo_inode_operations
, proc_fdinfo_operations
),
3438 DIR("ns", S_IRUSR
|S_IXUGO
, proc_ns_dir_inode_operations
, proc_ns_dir_operations
),
3440 DIR("net", S_IRUGO
|S_IXUGO
, proc_net_inode_operations
, proc_net_operations
),
3442 REG("environ", S_IRUSR
, proc_environ_operations
),
3443 REG("auxv", S_IRUSR
, proc_auxv_operations
),
3444 ONE("status", S_IRUGO
, proc_pid_status
),
3445 ONE("personality", S_IRUSR
, proc_pid_personality
),
3446 ONE("limits", S_IRUGO
, proc_pid_limits
),
3447 #ifdef CONFIG_SCHED_DEBUG
3448 REG("sched", S_IRUGO
|S_IWUSR
, proc_pid_sched_operations
),
3450 NOD("comm", S_IFREG
|S_IRUGO
|S_IWUSR
,
3451 &proc_tid_comm_inode_operations
,
3452 &proc_pid_set_comm_operations
, {}),
3453 #ifdef CONFIG_HAVE_ARCH_TRACEHOOK
3454 ONE("syscall", S_IRUSR
, proc_pid_syscall
),
3456 REG("cmdline", S_IRUGO
, proc_pid_cmdline_ops
),
3457 ONE("stat", S_IRUGO
, proc_tid_stat
),
3458 ONE("statm", S_IRUGO
, proc_pid_statm
),
3459 REG("maps", S_IRUGO
, proc_pid_maps_operations
),
3460 #ifdef CONFIG_PROC_CHILDREN
3461 REG("children", S_IRUGO
, proc_tid_children_operations
),
3464 REG("numa_maps", S_IRUGO
, proc_pid_numa_maps_operations
),
3466 REG("mem", S_IRUSR
|S_IWUSR
, proc_mem_operations
),
3467 LNK("cwd", proc_cwd_link
),
3468 LNK("root", proc_root_link
),
3469 LNK("exe", proc_exe_link
),
3470 REG("mounts", S_IRUGO
, proc_mounts_operations
),
3471 REG("mountinfo", S_IRUGO
, proc_mountinfo_operations
),
3472 #ifdef CONFIG_PROC_PAGE_MONITOR
3473 REG("clear_refs", S_IWUSR
, proc_clear_refs_operations
),
3474 REG("smaps", S_IRUGO
, proc_pid_smaps_operations
),
3475 REG("smaps_rollup", S_IRUGO
, proc_pid_smaps_rollup_operations
),
3476 REG("pagemap", S_IRUSR
, proc_pagemap_operations
),
3478 #ifdef CONFIG_SECURITY
3479 DIR("attr", S_IRUGO
|S_IXUGO
, proc_attr_dir_inode_operations
, proc_attr_dir_operations
),
3481 #ifdef CONFIG_KALLSYMS
3482 ONE("wchan", S_IRUGO
, proc_pid_wchan
),
3484 #ifdef CONFIG_STACKTRACE
3485 ONE("stack", S_IRUSR
, proc_pid_stack
),
3487 #ifdef CONFIG_SCHED_INFO
3488 ONE("schedstat", S_IRUGO
, proc_pid_schedstat
),
3490 #ifdef CONFIG_LATENCYTOP
3491 REG("latency", S_IRUGO
, proc_lstats_operations
),
3493 #ifdef CONFIG_PROC_PID_CPUSET
3494 ONE("cpuset", S_IRUGO
, proc_cpuset_show
),
3496 #ifdef CONFIG_CGROUPS
3497 ONE("cgroup", S_IRUGO
, proc_cgroup_show
),
3499 ONE("oom_score", S_IRUGO
, proc_oom_score
),
3500 REG("oom_adj", S_IRUGO
|S_IWUSR
, proc_oom_adj_operations
),
3501 REG("oom_score_adj", S_IRUGO
|S_IWUSR
, proc_oom_score_adj_operations
),
3503 REG("loginuid", S_IWUSR
|S_IRUGO
, proc_loginuid_operations
),
3504 REG("sessionid", S_IRUGO
, proc_sessionid_operations
),
3506 #ifdef CONFIG_FAULT_INJECTION
3507 REG("make-it-fail", S_IRUGO
|S_IWUSR
, proc_fault_inject_operations
),
3508 REG("fail-nth", 0644, proc_fail_nth_operations
),
3510 #ifdef CONFIG_TASK_IO_ACCOUNTING
3511 ONE("io", S_IRUSR
, proc_tid_io_accounting
),
3513 #ifdef CONFIG_USER_NS
3514 REG("uid_map", S_IRUGO
|S_IWUSR
, proc_uid_map_operations
),
3515 REG("gid_map", S_IRUGO
|S_IWUSR
, proc_gid_map_operations
),
3516 REG("projid_map", S_IRUGO
|S_IWUSR
, proc_projid_map_operations
),
3517 REG("setgroups", S_IRUGO
|S_IWUSR
, proc_setgroups_operations
),
3519 #ifdef CONFIG_LIVEPATCH
3520 ONE("patch_state", S_IRUSR
, proc_pid_patch_state
),
3522 #ifdef CONFIG_PROC_PID_ARCH_STATUS
3523 ONE("arch_status", S_IRUGO
, proc_pid_arch_status
),
3527 static int proc_tid_base_readdir(struct file
*file
, struct dir_context
*ctx
)
3529 return proc_pident_readdir(file
, ctx
,
3530 tid_base_stuff
, ARRAY_SIZE(tid_base_stuff
));
3533 static struct dentry
*proc_tid_base_lookup(struct inode
*dir
, struct dentry
*dentry
, unsigned int flags
)
3535 return proc_pident_lookup(dir
, dentry
,
3537 tid_base_stuff
+ ARRAY_SIZE(tid_base_stuff
));
3540 static const struct file_operations proc_tid_base_operations
= {
3541 .read
= generic_read_dir
,
3542 .iterate_shared
= proc_tid_base_readdir
,
3543 .llseek
= generic_file_llseek
,
3546 static const struct inode_operations proc_tid_base_inode_operations
= {
3547 .lookup
= proc_tid_base_lookup
,
3548 .getattr
= pid_getattr
,
3549 .setattr
= proc_setattr
,
3552 static struct dentry
*proc_task_instantiate(struct dentry
*dentry
,
3553 struct task_struct
*task
, const void *ptr
)
3555 struct inode
*inode
;
3556 inode
= proc_pid_make_inode(dentry
->d_sb
, task
, S_IFDIR
| S_IRUGO
| S_IXUGO
);
3558 return ERR_PTR(-ENOENT
);
3560 inode
->i_op
= &proc_tid_base_inode_operations
;
3561 inode
->i_fop
= &proc_tid_base_operations
;
3562 inode
->i_flags
|= S_IMMUTABLE
;
3564 set_nlink(inode
, nlink_tid
);
3565 pid_update_inode(task
, inode
);
3567 d_set_d_op(dentry
, &pid_dentry_operations
);
3568 return d_splice_alias(inode
, dentry
);
3571 static struct dentry
*proc_task_lookup(struct inode
*dir
, struct dentry
* dentry
, unsigned int flags
)
3573 struct task_struct
*task
;
3574 struct task_struct
*leader
= get_proc_task(dir
);
3576 struct pid_namespace
*ns
;
3577 struct dentry
*result
= ERR_PTR(-ENOENT
);
3582 tid
= name_to_int(&dentry
->d_name
);
3586 ns
= dentry
->d_sb
->s_fs_info
;
3588 task
= find_task_by_pid_ns(tid
, ns
);
3590 get_task_struct(task
);
3594 if (!same_thread_group(leader
, task
))
3597 result
= proc_task_instantiate(dentry
, task
, NULL
);
3599 put_task_struct(task
);
3601 put_task_struct(leader
);
3607 * Find the first tid of a thread group to return to user space.
3609 * Usually this is just the thread group leader, but if the users
3610 * buffer was too small or there was a seek into the middle of the
3611 * directory we have more work todo.
3613 * In the case of a short read we start with find_task_by_pid.
3615 * In the case of a seek we start with the leader and walk nr
3618 static struct task_struct
*first_tid(struct pid
*pid
, int tid
, loff_t f_pos
,
3619 struct pid_namespace
*ns
)
3621 struct task_struct
*pos
, *task
;
3622 unsigned long nr
= f_pos
;
3624 if (nr
!= f_pos
) /* 32bit overflow? */
3628 task
= pid_task(pid
, PIDTYPE_PID
);
3632 /* Attempt to start with the tid of a thread */
3634 pos
= find_task_by_pid_ns(tid
, ns
);
3635 if (pos
&& same_thread_group(pos
, task
))
3639 /* If nr exceeds the number of threads there is nothing todo */
3640 if (nr
>= get_nr_threads(task
))
3643 /* If we haven't found our starting place yet start
3644 * with the leader and walk nr threads forward.
3646 pos
= task
= task
->group_leader
;
3650 } while_each_thread(task
, pos
);
3655 get_task_struct(pos
);
3662 * Find the next thread in the thread list.
3663 * Return NULL if there is an error or no next thread.
3665 * The reference to the input task_struct is released.
3667 static struct task_struct
*next_tid(struct task_struct
*start
)
3669 struct task_struct
*pos
= NULL
;
3671 if (pid_alive(start
)) {
3672 pos
= next_thread(start
);
3673 if (thread_group_leader(pos
))
3676 get_task_struct(pos
);
3679 put_task_struct(start
);
3683 /* for the /proc/TGID/task/ directories */
3684 static int proc_task_readdir(struct file
*file
, struct dir_context
*ctx
)
3686 struct inode
*inode
= file_inode(file
);
3687 struct task_struct
*task
;
3688 struct pid_namespace
*ns
;
3691 if (proc_inode_is_dead(inode
))
3694 if (!dir_emit_dots(file
, ctx
))
3697 /* f_version caches the tgid value that the last readdir call couldn't
3698 * return. lseek aka telldir automagically resets f_version to 0.
3700 ns
= proc_pid_ns(inode
);
3701 tid
= (int)file
->f_version
;
3702 file
->f_version
= 0;
3703 for (task
= first_tid(proc_pid(inode
), tid
, ctx
->pos
- 2, ns
);
3705 task
= next_tid(task
), ctx
->pos
++) {
3708 tid
= task_pid_nr_ns(task
, ns
);
3709 len
= snprintf(name
, sizeof(name
), "%u", tid
);
3710 if (!proc_fill_cache(file
, ctx
, name
, len
,
3711 proc_task_instantiate
, task
, NULL
)) {
3712 /* returning this tgid failed, save it as the first
3713 * pid for the next readir call */
3714 file
->f_version
= (u64
)tid
;
3715 put_task_struct(task
);
3723 static int proc_task_getattr(const struct path
*path
, struct kstat
*stat
,
3724 u32 request_mask
, unsigned int query_flags
)
3726 struct inode
*inode
= d_inode(path
->dentry
);
3727 struct task_struct
*p
= get_proc_task(inode
);
3728 generic_fillattr(inode
, stat
);
3731 stat
->nlink
+= get_nr_threads(p
);
3738 static const struct inode_operations proc_task_inode_operations
= {
3739 .lookup
= proc_task_lookup
,
3740 .getattr
= proc_task_getattr
,
3741 .setattr
= proc_setattr
,
3742 .permission
= proc_pid_permission
,
3745 static const struct file_operations proc_task_operations
= {
3746 .read
= generic_read_dir
,
3747 .iterate_shared
= proc_task_readdir
,
3748 .llseek
= generic_file_llseek
,
3751 void __init
set_proc_pid_nlink(void)
3753 nlink_tid
= pid_entry_nlink(tid_base_stuff
, ARRAY_SIZE(tid_base_stuff
));
3754 nlink_tgid
= pid_entry_nlink(tgid_base_stuff
, ARRAY_SIZE(tgid_base_stuff
));