4 * Copyright (C) 1991, 1992 Linus Torvalds
6 * proc base directory handling functions
8 * 1999, Al Viro. Rewritten. Now it covers the whole per-process part.
9 * Instead of using magical inumbers to determine the kind of object
10 * we allocate and fill in-core inodes upon lookup. They don't even
11 * go into icache. We cache the reference to task_struct upon lookup too.
12 * Eventually it should become a filesystem in its own. We don't use the
13 * rest of procfs anymore.
19 * Bruna Moreira <bruna.moreira@indt.org.br>
20 * Edjard Mota <edjard.mota@indt.org.br>
21 * Ilias Biris <ilias.biris@indt.org.br>
22 * Mauricio Lin <mauricio.lin@indt.org.br>
24 * Embedded Linux Lab - 10LE Instituto Nokia de Tecnologia - INdT
26 * A new process specific entry (smaps) included in /proc. It shows the
27 * size of rss for each memory area. The maps entry lacks information
28 * about physical memory size (rss) for each mapped file, i.e.,
29 * rss information for executables and library files.
30 * This additional information is useful for any tools that need to know
31 * about physical memory consumption for a process specific library.
35 * Embedded Linux Lab - 10LE Instituto Nokia de Tecnologia - INdT
36 * Pud inclusion in the page table walking.
40 * 10LE Instituto Nokia de Tecnologia - INdT:
41 * A better way to walks through the page table as suggested by Hugh Dickins.
43 * Simo Piiroinen <simo.piiroinen@nokia.com>:
44 * Smaps information related to shared, private, clean and dirty pages.
46 * Paul Mundt <paul.mundt@nokia.com>:
47 * Overall revision about smaps.
50 #include <asm/uaccess.h>
52 #include <linux/errno.h>
53 #include <linux/time.h>
54 #include <linux/proc_fs.h>
55 #include <linux/stat.h>
56 #include <linux/task_io_accounting_ops.h>
57 #include <linux/init.h>
58 #include <linux/capability.h>
59 #include <linux/file.h>
60 #include <linux/fdtable.h>
61 #include <linux/string.h>
62 #include <linux/seq_file.h>
63 #include <linux/namei.h>
64 #include <linux/mnt_namespace.h>
66 #include <linux/swap.h>
67 #include <linux/rcupdate.h>
68 #include <linux/kallsyms.h>
69 #include <linux/stacktrace.h>
70 #include <linux/resource.h>
71 #include <linux/module.h>
72 #include <linux/mount.h>
73 #include <linux/security.h>
74 #include <linux/ptrace.h>
75 #include <linux/tracehook.h>
76 #include <linux/printk.h>
77 #include <linux/cgroup.h>
78 #include <linux/cpuset.h>
79 #include <linux/audit.h>
80 #include <linux/poll.h>
81 #include <linux/nsproxy.h>
82 #include <linux/oom.h>
83 #include <linux/elf.h>
84 #include <linux/pid_namespace.h>
85 #include <linux/user_namespace.h>
86 #include <linux/fs_struct.h>
87 #include <linux/slab.h>
88 #include <linux/flex_array.h>
89 #include <linux/posix-timers.h>
90 #ifdef CONFIG_HARDWALL
91 #include <asm/hardwall.h>
93 #include <trace/events/oom.h>
98 * Implementing inode permission operations in /proc is almost
99 * certainly an error. Permission checks need to happen during
100 * each system call not at open time. The reason is that most of
101 * what we wish to check for permissions in /proc varies at runtime.
103 * The classic example of a problem is opening file descriptors
104 * in /proc for a task before it execs a suid executable.
111 const struct inode_operations
*iop
;
112 const struct file_operations
*fop
;
116 #define NOD(NAME, MODE, IOP, FOP, OP) { \
118 .len = sizeof(NAME) - 1, \
125 #define DIR(NAME, MODE, iops, fops) \
126 NOD(NAME, (S_IFDIR|(MODE)), &iops, &fops, {} )
127 #define LNK(NAME, get_link) \
128 NOD(NAME, (S_IFLNK|S_IRWXUGO), \
129 &proc_pid_link_inode_operations, NULL, \
130 { .proc_get_link = get_link } )
131 #define REG(NAME, MODE, fops) \
132 NOD(NAME, (S_IFREG|(MODE)), NULL, &fops, {})
133 #define INF(NAME, MODE, read) \
134 NOD(NAME, (S_IFREG|(MODE)), \
135 NULL, &proc_info_file_operations, \
136 { .proc_read = read } )
137 #define ONE(NAME, MODE, show) \
138 NOD(NAME, (S_IFREG|(MODE)), \
139 NULL, &proc_single_file_operations, \
140 { .proc_show = show } )
143 * Count the number of hardlinks for the pid_entry table, excluding the .
146 static unsigned int pid_entry_count_dirs(const struct pid_entry
*entries
,
153 for (i
= 0; i
< n
; ++i
) {
154 if (S_ISDIR(entries
[i
].mode
))
161 static int get_task_root(struct task_struct
*task
, struct path
*root
)
163 int result
= -ENOENT
;
167 get_fs_root(task
->fs
, root
);
174 static int proc_cwd_link(struct dentry
*dentry
, struct path
*path
)
176 struct task_struct
*task
= get_proc_task(dentry
->d_inode
);
177 int result
= -ENOENT
;
182 get_fs_pwd(task
->fs
, path
);
186 put_task_struct(task
);
191 static int proc_root_link(struct dentry
*dentry
, struct path
*path
)
193 struct task_struct
*task
= get_proc_task(dentry
->d_inode
);
194 int result
= -ENOENT
;
197 result
= get_task_root(task
, path
);
198 put_task_struct(task
);
203 static int proc_pid_cmdline(struct task_struct
*task
, char *buffer
)
205 return get_cmdline(task
, buffer
, PAGE_SIZE
);
208 static int proc_pid_auxv(struct task_struct
*task
, char *buffer
)
210 struct mm_struct
*mm
= mm_access(task
, PTRACE_MODE_READ
);
211 int res
= PTR_ERR(mm
);
212 if (mm
&& !IS_ERR(mm
)) {
213 unsigned int nwords
= 0;
216 } while (mm
->saved_auxv
[nwords
- 2] != 0); /* AT_NULL */
217 res
= nwords
* sizeof(mm
->saved_auxv
[0]);
220 memcpy(buffer
, mm
->saved_auxv
, res
);
227 #ifdef CONFIG_KALLSYMS
229 * Provides a wchan file via kallsyms in a proper one-value-per-file format.
230 * Returns the resolved symbol. If that fails, simply return the address.
232 static int proc_pid_wchan(struct task_struct
*task
, char *buffer
)
235 char symname
[KSYM_NAME_LEN
];
237 wchan
= get_wchan(task
);
239 if (lookup_symbol_name(wchan
, symname
) < 0)
240 if (!ptrace_may_access(task
, PTRACE_MODE_READ
))
243 return sprintf(buffer
, "%lu", wchan
);
245 return sprintf(buffer
, "%s", symname
);
247 #endif /* CONFIG_KALLSYMS */
249 static int lock_trace(struct task_struct
*task
)
251 int err
= mutex_lock_killable(&task
->signal
->cred_guard_mutex
);
254 if (!ptrace_may_access(task
, PTRACE_MODE_ATTACH
)) {
255 mutex_unlock(&task
->signal
->cred_guard_mutex
);
261 static void unlock_trace(struct task_struct
*task
)
263 mutex_unlock(&task
->signal
->cred_guard_mutex
);
266 #ifdef CONFIG_STACKTRACE
268 #define MAX_STACK_TRACE_DEPTH 64
270 static int proc_pid_stack(struct seq_file
*m
, struct pid_namespace
*ns
,
271 struct pid
*pid
, struct task_struct
*task
)
273 struct stack_trace trace
;
274 unsigned long *entries
;
278 entries
= kmalloc(MAX_STACK_TRACE_DEPTH
* sizeof(*entries
), GFP_KERNEL
);
282 trace
.nr_entries
= 0;
283 trace
.max_entries
= MAX_STACK_TRACE_DEPTH
;
284 trace
.entries
= entries
;
287 err
= lock_trace(task
);
289 save_stack_trace_tsk(task
, &trace
);
291 for (i
= 0; i
< trace
.nr_entries
; i
++) {
292 seq_printf(m
, "[<%pK>] %pS\n",
293 (void *)entries
[i
], (void *)entries
[i
]);
303 #ifdef CONFIG_SCHEDSTATS
305 * Provides /proc/PID/schedstat
307 static int proc_pid_schedstat(struct task_struct
*task
, char *buffer
)
309 return sprintf(buffer
, "%llu %llu %lu\n",
310 (unsigned long long)task
->se
.sum_exec_runtime
,
311 (unsigned long long)task
->sched_info
.run_delay
,
312 task
->sched_info
.pcount
);
316 #ifdef CONFIG_LATENCYTOP
317 static int lstats_show_proc(struct seq_file
*m
, void *v
)
320 struct inode
*inode
= m
->private;
321 struct task_struct
*task
= get_proc_task(inode
);
325 seq_puts(m
, "Latency Top version : v0.1\n");
326 for (i
= 0; i
< 32; i
++) {
327 struct latency_record
*lr
= &task
->latency_record
[i
];
328 if (lr
->backtrace
[0]) {
330 seq_printf(m
, "%i %li %li",
331 lr
->count
, lr
->time
, lr
->max
);
332 for (q
= 0; q
< LT_BACKTRACEDEPTH
; q
++) {
333 unsigned long bt
= lr
->backtrace
[q
];
338 seq_printf(m
, " %ps", (void *)bt
);
344 put_task_struct(task
);
348 static int lstats_open(struct inode
*inode
, struct file
*file
)
350 return single_open(file
, lstats_show_proc
, inode
);
353 static ssize_t
lstats_write(struct file
*file
, const char __user
*buf
,
354 size_t count
, loff_t
*offs
)
356 struct task_struct
*task
= get_proc_task(file_inode(file
));
360 clear_all_latency_tracing(task
);
361 put_task_struct(task
);
366 static const struct file_operations proc_lstats_operations
= {
369 .write
= lstats_write
,
371 .release
= single_release
,
376 #ifdef CONFIG_CGROUPS
377 static int cgroup_open(struct inode
*inode
, struct file
*file
)
379 struct pid
*pid
= PROC_I(inode
)->pid
;
380 return single_open(file
, proc_cgroup_show
, pid
);
383 static const struct file_operations proc_cgroup_operations
= {
387 .release
= single_release
,
391 #ifdef CONFIG_PROC_PID_CPUSET
393 static int cpuset_open(struct inode
*inode
, struct file
*file
)
395 struct pid
*pid
= PROC_I(inode
)->pid
;
396 return single_open(file
, proc_cpuset_show
, pid
);
399 static const struct file_operations proc_cpuset_operations
= {
403 .release
= single_release
,
407 static int proc_oom_score(struct task_struct
*task
, char *buffer
)
409 unsigned long totalpages
= totalram_pages
+ total_swap_pages
;
410 unsigned long points
= 0;
412 read_lock(&tasklist_lock
);
414 points
= oom_badness(task
, NULL
, NULL
, totalpages
) *
416 read_unlock(&tasklist_lock
);
417 return sprintf(buffer
, "%lu\n", points
);
425 static const struct limit_names lnames
[RLIM_NLIMITS
] = {
426 [RLIMIT_CPU
] = {"Max cpu time", "seconds"},
427 [RLIMIT_FSIZE
] = {"Max file size", "bytes"},
428 [RLIMIT_DATA
] = {"Max data size", "bytes"},
429 [RLIMIT_STACK
] = {"Max stack size", "bytes"},
430 [RLIMIT_CORE
] = {"Max core file size", "bytes"},
431 [RLIMIT_RSS
] = {"Max resident set", "bytes"},
432 [RLIMIT_NPROC
] = {"Max processes", "processes"},
433 [RLIMIT_NOFILE
] = {"Max open files", "files"},
434 [RLIMIT_MEMLOCK
] = {"Max locked memory", "bytes"},
435 [RLIMIT_AS
] = {"Max address space", "bytes"},
436 [RLIMIT_LOCKS
] = {"Max file locks", "locks"},
437 [RLIMIT_SIGPENDING
] = {"Max pending signals", "signals"},
438 [RLIMIT_MSGQUEUE
] = {"Max msgqueue size", "bytes"},
439 [RLIMIT_NICE
] = {"Max nice priority", NULL
},
440 [RLIMIT_RTPRIO
] = {"Max realtime priority", NULL
},
441 [RLIMIT_RTTIME
] = {"Max realtime timeout", "us"},
444 /* Display limits for a process */
445 static int proc_pid_limits(struct task_struct
*task
, char *buffer
)
450 char *bufptr
= buffer
;
452 struct rlimit rlim
[RLIM_NLIMITS
];
454 if (!lock_task_sighand(task
, &flags
))
456 memcpy(rlim
, task
->signal
->rlim
, sizeof(struct rlimit
) * RLIM_NLIMITS
);
457 unlock_task_sighand(task
, &flags
);
460 * print the file header
462 count
+= sprintf(&bufptr
[count
], "%-25s %-20s %-20s %-10s\n",
463 "Limit", "Soft Limit", "Hard Limit", "Units");
465 for (i
= 0; i
< RLIM_NLIMITS
; i
++) {
466 if (rlim
[i
].rlim_cur
== RLIM_INFINITY
)
467 count
+= sprintf(&bufptr
[count
], "%-25s %-20s ",
468 lnames
[i
].name
, "unlimited");
470 count
+= sprintf(&bufptr
[count
], "%-25s %-20lu ",
471 lnames
[i
].name
, rlim
[i
].rlim_cur
);
473 if (rlim
[i
].rlim_max
== RLIM_INFINITY
)
474 count
+= sprintf(&bufptr
[count
], "%-20s ", "unlimited");
476 count
+= sprintf(&bufptr
[count
], "%-20lu ",
480 count
+= sprintf(&bufptr
[count
], "%-10s\n",
483 count
+= sprintf(&bufptr
[count
], "\n");
489 #ifdef CONFIG_HAVE_ARCH_TRACEHOOK
490 static int proc_pid_syscall(struct task_struct
*task
, char *buffer
)
493 unsigned long args
[6], sp
, pc
;
494 int res
= lock_trace(task
);
498 if (task_current_syscall(task
, &nr
, args
, 6, &sp
, &pc
))
499 res
= sprintf(buffer
, "running\n");
501 res
= sprintf(buffer
, "%ld 0x%lx 0x%lx\n", nr
, sp
, pc
);
503 res
= sprintf(buffer
,
504 "%ld 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx\n",
506 args
[0], args
[1], args
[2], args
[3], args
[4], args
[5],
511 #endif /* CONFIG_HAVE_ARCH_TRACEHOOK */
513 /************************************************************************/
514 /* Here the fs part begins */
515 /************************************************************************/
517 /* permission checks */
518 static int proc_fd_access_allowed(struct inode
*inode
)
520 struct task_struct
*task
;
522 /* Allow access to a task's file descriptors if it is us or we
523 * may use ptrace attach to the process and find out that
526 task
= get_proc_task(inode
);
528 allowed
= ptrace_may_access(task
, PTRACE_MODE_READ
);
529 put_task_struct(task
);
534 int proc_setattr(struct dentry
*dentry
, struct iattr
*attr
)
537 struct inode
*inode
= dentry
->d_inode
;
539 if (attr
->ia_valid
& ATTR_MODE
)
542 error
= inode_change_ok(inode
, attr
);
546 setattr_copy(inode
, attr
);
547 mark_inode_dirty(inode
);
552 * May current process learn task's sched/cmdline info (for hide_pid_min=1)
553 * or euid/egid (for hide_pid_min=2)?
555 static bool has_pid_permissions(struct pid_namespace
*pid
,
556 struct task_struct
*task
,
559 if (pid
->hide_pid
< hide_pid_min
)
561 if (in_group_p(pid
->pid_gid
))
563 return ptrace_may_access(task
, PTRACE_MODE_READ
);
567 static int proc_pid_permission(struct inode
*inode
, int mask
)
569 struct pid_namespace
*pid
= inode
->i_sb
->s_fs_info
;
570 struct task_struct
*task
;
573 task
= get_proc_task(inode
);
576 has_perms
= has_pid_permissions(pid
, task
, 1);
577 put_task_struct(task
);
580 if (pid
->hide_pid
== 2) {
582 * Let's make getdents(), stat(), and open()
583 * consistent with each other. If a process
584 * may not stat() a file, it shouldn't be seen
592 return generic_permission(inode
, mask
);
597 static const struct inode_operations proc_def_inode_operations
= {
598 .setattr
= proc_setattr
,
601 #define PROC_BLOCK_SIZE (3*1024) /* 4K page size but our output routines use some slack for overruns */
603 static ssize_t
proc_info_read(struct file
* file
, char __user
* buf
,
604 size_t count
, loff_t
*ppos
)
606 struct inode
* inode
= file_inode(file
);
609 struct task_struct
*task
= get_proc_task(inode
);
615 if (count
> PROC_BLOCK_SIZE
)
616 count
= PROC_BLOCK_SIZE
;
619 if (!(page
= __get_free_page(GFP_TEMPORARY
)))
622 length
= PROC_I(inode
)->op
.proc_read(task
, (char*)page
);
625 length
= simple_read_from_buffer(buf
, count
, ppos
, (char *)page
, length
);
628 put_task_struct(task
);
633 static const struct file_operations proc_info_file_operations
= {
634 .read
= proc_info_read
,
635 .llseek
= generic_file_llseek
,
638 static int proc_single_show(struct seq_file
*m
, void *v
)
640 struct inode
*inode
= m
->private;
641 struct pid_namespace
*ns
;
643 struct task_struct
*task
;
646 ns
= inode
->i_sb
->s_fs_info
;
647 pid
= proc_pid(inode
);
648 task
= get_pid_task(pid
, PIDTYPE_PID
);
652 ret
= PROC_I(inode
)->op
.proc_show(m
, ns
, pid
, task
);
654 put_task_struct(task
);
658 static int proc_single_open(struct inode
*inode
, struct file
*filp
)
660 return single_open(filp
, proc_single_show
, inode
);
663 static const struct file_operations proc_single_file_operations
= {
664 .open
= proc_single_open
,
667 .release
= single_release
,
670 static int __mem_open(struct inode
*inode
, struct file
*file
, unsigned int mode
)
672 struct task_struct
*task
= get_proc_task(file_inode(file
));
673 struct mm_struct
*mm
;
678 mm
= mm_access(task
, mode
);
679 put_task_struct(task
);
685 /* ensure this mm_struct can't be freed */
686 atomic_inc(&mm
->mm_count
);
687 /* but do not pin its memory */
691 file
->private_data
= mm
;
696 static int mem_open(struct inode
*inode
, struct file
*file
)
698 int ret
= __mem_open(inode
, file
, PTRACE_MODE_ATTACH
);
700 /* OK to pass negative loff_t, we can catch out-of-range */
701 file
->f_mode
|= FMODE_UNSIGNED_OFFSET
;
706 static ssize_t
mem_rw(struct file
*file
, char __user
*buf
,
707 size_t count
, loff_t
*ppos
, int write
)
709 struct mm_struct
*mm
= file
->private_data
;
710 unsigned long addr
= *ppos
;
717 page
= (char *)__get_free_page(GFP_TEMPORARY
);
722 if (!atomic_inc_not_zero(&mm
->mm_users
))
726 int this_len
= min_t(int, count
, PAGE_SIZE
);
728 if (write
&& copy_from_user(page
, buf
, this_len
)) {
733 this_len
= access_remote_vm(mm
, addr
, page
, this_len
, write
);
740 if (!write
&& copy_to_user(buf
, page
, this_len
)) {
754 free_page((unsigned long) page
);
758 static ssize_t
mem_read(struct file
*file
, char __user
*buf
,
759 size_t count
, loff_t
*ppos
)
761 return mem_rw(file
, buf
, count
, ppos
, 0);
764 static ssize_t
mem_write(struct file
*file
, const char __user
*buf
,
765 size_t count
, loff_t
*ppos
)
767 return mem_rw(file
, (char __user
*)buf
, count
, ppos
, 1);
770 loff_t
mem_lseek(struct file
*file
, loff_t offset
, int orig
)
774 file
->f_pos
= offset
;
777 file
->f_pos
+= offset
;
782 force_successful_syscall_return();
786 static int mem_release(struct inode
*inode
, struct file
*file
)
788 struct mm_struct
*mm
= file
->private_data
;
794 static const struct file_operations proc_mem_operations
= {
799 .release
= mem_release
,
802 static int environ_open(struct inode
*inode
, struct file
*file
)
804 return __mem_open(inode
, file
, PTRACE_MODE_READ
);
807 static ssize_t
environ_read(struct file
*file
, char __user
*buf
,
808 size_t count
, loff_t
*ppos
)
811 unsigned long src
= *ppos
;
813 struct mm_struct
*mm
= file
->private_data
;
818 page
= (char *)__get_free_page(GFP_TEMPORARY
);
823 if (!atomic_inc_not_zero(&mm
->mm_users
))
826 size_t this_len
, max_len
;
829 if (src
>= (mm
->env_end
- mm
->env_start
))
832 this_len
= mm
->env_end
- (mm
->env_start
+ src
);
834 max_len
= min_t(size_t, PAGE_SIZE
, count
);
835 this_len
= min(max_len
, this_len
);
837 retval
= access_remote_vm(mm
, (mm
->env_start
+ src
),
845 if (copy_to_user(buf
, page
, retval
)) {
859 free_page((unsigned long) page
);
863 static const struct file_operations proc_environ_operations
= {
864 .open
= environ_open
,
865 .read
= environ_read
,
866 .llseek
= generic_file_llseek
,
867 .release
= mem_release
,
870 static ssize_t
oom_adj_read(struct file
*file
, char __user
*buf
, size_t count
,
873 struct task_struct
*task
= get_proc_task(file_inode(file
));
874 char buffer
[PROC_NUMBUF
];
875 int oom_adj
= OOM_ADJUST_MIN
;
881 if (lock_task_sighand(task
, &flags
)) {
882 if (task
->signal
->oom_score_adj
== OOM_SCORE_ADJ_MAX
)
883 oom_adj
= OOM_ADJUST_MAX
;
885 oom_adj
= (task
->signal
->oom_score_adj
* -OOM_DISABLE
) /
887 unlock_task_sighand(task
, &flags
);
889 put_task_struct(task
);
890 len
= snprintf(buffer
, sizeof(buffer
), "%d\n", oom_adj
);
891 return simple_read_from_buffer(buf
, count
, ppos
, buffer
, len
);
894 static ssize_t
oom_adj_write(struct file
*file
, const char __user
*buf
,
895 size_t count
, loff_t
*ppos
)
897 struct task_struct
*task
;
898 char buffer
[PROC_NUMBUF
];
903 memset(buffer
, 0, sizeof(buffer
));
904 if (count
> sizeof(buffer
) - 1)
905 count
= sizeof(buffer
) - 1;
906 if (copy_from_user(buffer
, buf
, count
)) {
911 err
= kstrtoint(strstrip(buffer
), 0, &oom_adj
);
914 if ((oom_adj
< OOM_ADJUST_MIN
|| oom_adj
> OOM_ADJUST_MAX
) &&
915 oom_adj
!= OOM_DISABLE
) {
920 task
= get_proc_task(file_inode(file
));
932 if (!lock_task_sighand(task
, &flags
)) {
938 * Scale /proc/pid/oom_score_adj appropriately ensuring that a maximum
939 * value is always attainable.
941 if (oom_adj
== OOM_ADJUST_MAX
)
942 oom_adj
= OOM_SCORE_ADJ_MAX
;
944 oom_adj
= (oom_adj
* OOM_SCORE_ADJ_MAX
) / -OOM_DISABLE
;
946 if (oom_adj
< task
->signal
->oom_score_adj
&&
947 !capable(CAP_SYS_RESOURCE
)) {
953 * /proc/pid/oom_adj is provided for legacy purposes, ask users to use
954 * /proc/pid/oom_score_adj instead.
956 pr_warn_once("%s (%d): /proc/%d/oom_adj is deprecated, please use /proc/%d/oom_score_adj instead.\n",
957 current
->comm
, task_pid_nr(current
), task_pid_nr(task
),
960 task
->signal
->oom_score_adj
= oom_adj
;
961 trace_oom_score_adj_update(task
);
963 unlock_task_sighand(task
, &flags
);
966 put_task_struct(task
);
968 return err
< 0 ? err
: count
;
971 static const struct file_operations proc_oom_adj_operations
= {
972 .read
= oom_adj_read
,
973 .write
= oom_adj_write
,
974 .llseek
= generic_file_llseek
,
977 static ssize_t
oom_score_adj_read(struct file
*file
, char __user
*buf
,
978 size_t count
, loff_t
*ppos
)
980 struct task_struct
*task
= get_proc_task(file_inode(file
));
981 char buffer
[PROC_NUMBUF
];
982 short oom_score_adj
= OOM_SCORE_ADJ_MIN
;
988 if (lock_task_sighand(task
, &flags
)) {
989 oom_score_adj
= task
->signal
->oom_score_adj
;
990 unlock_task_sighand(task
, &flags
);
992 put_task_struct(task
);
993 len
= snprintf(buffer
, sizeof(buffer
), "%hd\n", oom_score_adj
);
994 return simple_read_from_buffer(buf
, count
, ppos
, buffer
, len
);
997 static ssize_t
oom_score_adj_write(struct file
*file
, const char __user
*buf
,
998 size_t count
, loff_t
*ppos
)
1000 struct task_struct
*task
;
1001 char buffer
[PROC_NUMBUF
];
1002 unsigned long flags
;
1006 memset(buffer
, 0, sizeof(buffer
));
1007 if (count
> sizeof(buffer
) - 1)
1008 count
= sizeof(buffer
) - 1;
1009 if (copy_from_user(buffer
, buf
, count
)) {
1014 err
= kstrtoint(strstrip(buffer
), 0, &oom_score_adj
);
1017 if (oom_score_adj
< OOM_SCORE_ADJ_MIN
||
1018 oom_score_adj
> OOM_SCORE_ADJ_MAX
) {
1023 task
= get_proc_task(file_inode(file
));
1035 if (!lock_task_sighand(task
, &flags
)) {
1040 if ((short)oom_score_adj
< task
->signal
->oom_score_adj_min
&&
1041 !capable(CAP_SYS_RESOURCE
)) {
1046 task
->signal
->oom_score_adj
= (short)oom_score_adj
;
1047 if (has_capability_noaudit(current
, CAP_SYS_RESOURCE
))
1048 task
->signal
->oom_score_adj_min
= (short)oom_score_adj
;
1049 trace_oom_score_adj_update(task
);
1052 unlock_task_sighand(task
, &flags
);
1055 put_task_struct(task
);
1057 return err
< 0 ? err
: count
;
1060 static const struct file_operations proc_oom_score_adj_operations
= {
1061 .read
= oom_score_adj_read
,
1062 .write
= oom_score_adj_write
,
1063 .llseek
= default_llseek
,
1066 #ifdef CONFIG_AUDITSYSCALL
1067 #define TMPBUFLEN 21
1068 static ssize_t
proc_loginuid_read(struct file
* file
, char __user
* buf
,
1069 size_t count
, loff_t
*ppos
)
1071 struct inode
* inode
= file_inode(file
);
1072 struct task_struct
*task
= get_proc_task(inode
);
1074 char tmpbuf
[TMPBUFLEN
];
1078 length
= scnprintf(tmpbuf
, TMPBUFLEN
, "%u",
1079 from_kuid(file
->f_cred
->user_ns
,
1080 audit_get_loginuid(task
)));
1081 put_task_struct(task
);
1082 return simple_read_from_buffer(buf
, count
, ppos
, tmpbuf
, length
);
1085 static ssize_t
proc_loginuid_write(struct file
* file
, const char __user
* buf
,
1086 size_t count
, loff_t
*ppos
)
1088 struct inode
* inode
= file_inode(file
);
1095 if (current
!= pid_task(proc_pid(inode
), PIDTYPE_PID
)) {
1101 if (count
>= PAGE_SIZE
)
1102 count
= PAGE_SIZE
- 1;
1105 /* No partial writes. */
1108 page
= (char*)__get_free_page(GFP_TEMPORARY
);
1112 if (copy_from_user(page
, buf
, count
))
1116 loginuid
= simple_strtoul(page
, &tmp
, 10);
1123 /* is userspace tring to explicitly UNSET the loginuid? */
1124 if (loginuid
== AUDIT_UID_UNSET
) {
1125 kloginuid
= INVALID_UID
;
1127 kloginuid
= make_kuid(file
->f_cred
->user_ns
, loginuid
);
1128 if (!uid_valid(kloginuid
)) {
1134 length
= audit_set_loginuid(kloginuid
);
1135 if (likely(length
== 0))
1139 free_page((unsigned long) page
);
1143 static const struct file_operations proc_loginuid_operations
= {
1144 .read
= proc_loginuid_read
,
1145 .write
= proc_loginuid_write
,
1146 .llseek
= generic_file_llseek
,
1149 static ssize_t
proc_sessionid_read(struct file
* file
, char __user
* buf
,
1150 size_t count
, loff_t
*ppos
)
1152 struct inode
* inode
= file_inode(file
);
1153 struct task_struct
*task
= get_proc_task(inode
);
1155 char tmpbuf
[TMPBUFLEN
];
1159 length
= scnprintf(tmpbuf
, TMPBUFLEN
, "%u",
1160 audit_get_sessionid(task
));
1161 put_task_struct(task
);
1162 return simple_read_from_buffer(buf
, count
, ppos
, tmpbuf
, length
);
1165 static const struct file_operations proc_sessionid_operations
= {
1166 .read
= proc_sessionid_read
,
1167 .llseek
= generic_file_llseek
,
1171 #ifdef CONFIG_FAULT_INJECTION
1172 static ssize_t
proc_fault_inject_read(struct file
* file
, char __user
* buf
,
1173 size_t count
, loff_t
*ppos
)
1175 struct task_struct
*task
= get_proc_task(file_inode(file
));
1176 char buffer
[PROC_NUMBUF
];
1182 make_it_fail
= task
->make_it_fail
;
1183 put_task_struct(task
);
1185 len
= snprintf(buffer
, sizeof(buffer
), "%i\n", make_it_fail
);
1187 return simple_read_from_buffer(buf
, count
, ppos
, buffer
, len
);
1190 static ssize_t
proc_fault_inject_write(struct file
* file
,
1191 const char __user
* buf
, size_t count
, loff_t
*ppos
)
1193 struct task_struct
*task
;
1194 char buffer
[PROC_NUMBUF
], *end
;
1197 if (!capable(CAP_SYS_RESOURCE
))
1199 memset(buffer
, 0, sizeof(buffer
));
1200 if (count
> sizeof(buffer
) - 1)
1201 count
= sizeof(buffer
) - 1;
1202 if (copy_from_user(buffer
, buf
, count
))
1204 make_it_fail
= simple_strtol(strstrip(buffer
), &end
, 0);
1207 if (make_it_fail
< 0 || make_it_fail
> 1)
1210 task
= get_proc_task(file_inode(file
));
1213 task
->make_it_fail
= make_it_fail
;
1214 put_task_struct(task
);
1219 static const struct file_operations proc_fault_inject_operations
= {
1220 .read
= proc_fault_inject_read
,
1221 .write
= proc_fault_inject_write
,
1222 .llseek
= generic_file_llseek
,
1227 #ifdef CONFIG_SCHED_DEBUG
1229 * Print out various scheduling related per-task fields:
1231 static int sched_show(struct seq_file
*m
, void *v
)
1233 struct inode
*inode
= m
->private;
1234 struct task_struct
*p
;
1236 p
= get_proc_task(inode
);
1239 proc_sched_show_task(p
, m
);
1247 sched_write(struct file
*file
, const char __user
*buf
,
1248 size_t count
, loff_t
*offset
)
1250 struct inode
*inode
= file_inode(file
);
1251 struct task_struct
*p
;
1253 p
= get_proc_task(inode
);
1256 proc_sched_set_task(p
);
1263 static int sched_open(struct inode
*inode
, struct file
*filp
)
1265 return single_open(filp
, sched_show
, inode
);
1268 static const struct file_operations proc_pid_sched_operations
= {
1271 .write
= sched_write
,
1272 .llseek
= seq_lseek
,
1273 .release
= single_release
,
1278 #ifdef CONFIG_SCHED_AUTOGROUP
1280 * Print out autogroup related information:
1282 static int sched_autogroup_show(struct seq_file
*m
, void *v
)
1284 struct inode
*inode
= m
->private;
1285 struct task_struct
*p
;
1287 p
= get_proc_task(inode
);
1290 proc_sched_autogroup_show_task(p
, m
);
1298 sched_autogroup_write(struct file
*file
, const char __user
*buf
,
1299 size_t count
, loff_t
*offset
)
1301 struct inode
*inode
= file_inode(file
);
1302 struct task_struct
*p
;
1303 char buffer
[PROC_NUMBUF
];
1307 memset(buffer
, 0, sizeof(buffer
));
1308 if (count
> sizeof(buffer
) - 1)
1309 count
= sizeof(buffer
) - 1;
1310 if (copy_from_user(buffer
, buf
, count
))
1313 err
= kstrtoint(strstrip(buffer
), 0, &nice
);
1317 p
= get_proc_task(inode
);
1321 err
= proc_sched_autogroup_set_nice(p
, nice
);
1330 static int sched_autogroup_open(struct inode
*inode
, struct file
*filp
)
1334 ret
= single_open(filp
, sched_autogroup_show
, NULL
);
1336 struct seq_file
*m
= filp
->private_data
;
1343 static const struct file_operations proc_pid_sched_autogroup_operations
= {
1344 .open
= sched_autogroup_open
,
1346 .write
= sched_autogroup_write
,
1347 .llseek
= seq_lseek
,
1348 .release
= single_release
,
1351 #endif /* CONFIG_SCHED_AUTOGROUP */
1353 static ssize_t
comm_write(struct file
*file
, const char __user
*buf
,
1354 size_t count
, loff_t
*offset
)
1356 struct inode
*inode
= file_inode(file
);
1357 struct task_struct
*p
;
1358 char buffer
[TASK_COMM_LEN
];
1359 const size_t maxlen
= sizeof(buffer
) - 1;
1361 memset(buffer
, 0, sizeof(buffer
));
1362 if (copy_from_user(buffer
, buf
, count
> maxlen
? maxlen
: count
))
1365 p
= get_proc_task(inode
);
1369 if (same_thread_group(current
, p
))
1370 set_task_comm(p
, buffer
);
1379 static int comm_show(struct seq_file
*m
, void *v
)
1381 struct inode
*inode
= m
->private;
1382 struct task_struct
*p
;
1384 p
= get_proc_task(inode
);
1389 seq_printf(m
, "%s\n", p
->comm
);
1397 static int comm_open(struct inode
*inode
, struct file
*filp
)
1399 return single_open(filp
, comm_show
, inode
);
1402 static const struct file_operations proc_pid_set_comm_operations
= {
1405 .write
= comm_write
,
1406 .llseek
= seq_lseek
,
1407 .release
= single_release
,
1410 static int proc_exe_link(struct dentry
*dentry
, struct path
*exe_path
)
1412 struct task_struct
*task
;
1413 struct mm_struct
*mm
;
1414 struct file
*exe_file
;
1416 task
= get_proc_task(dentry
->d_inode
);
1419 mm
= get_task_mm(task
);
1420 put_task_struct(task
);
1423 exe_file
= get_mm_exe_file(mm
);
1426 *exe_path
= exe_file
->f_path
;
1427 path_get(&exe_file
->f_path
);
1434 static void *proc_pid_follow_link(struct dentry
*dentry
, struct nameidata
*nd
)
1436 struct inode
*inode
= dentry
->d_inode
;
1438 int error
= -EACCES
;
1440 /* Are we allowed to snoop on the tasks file descriptors? */
1441 if (!proc_fd_access_allowed(inode
))
1444 error
= PROC_I(inode
)->op
.proc_get_link(dentry
, &path
);
1448 nd_jump_link(nd
, &path
);
1451 return ERR_PTR(error
);
1454 static int do_proc_readlink(struct path
*path
, char __user
*buffer
, int buflen
)
1456 char *tmp
= (char*)__get_free_page(GFP_TEMPORARY
);
1463 pathname
= d_path(path
, tmp
, PAGE_SIZE
);
1464 len
= PTR_ERR(pathname
);
1465 if (IS_ERR(pathname
))
1467 len
= tmp
+ PAGE_SIZE
- 1 - pathname
;
1471 if (copy_to_user(buffer
, pathname
, len
))
1474 free_page((unsigned long)tmp
);
1478 static int proc_pid_readlink(struct dentry
* dentry
, char __user
* buffer
, int buflen
)
1480 int error
= -EACCES
;
1481 struct inode
*inode
= dentry
->d_inode
;
1484 /* Are we allowed to snoop on the tasks file descriptors? */
1485 if (!proc_fd_access_allowed(inode
))
1488 error
= PROC_I(inode
)->op
.proc_get_link(dentry
, &path
);
1492 error
= do_proc_readlink(&path
, buffer
, buflen
);
1498 const struct inode_operations proc_pid_link_inode_operations
= {
1499 .readlink
= proc_pid_readlink
,
1500 .follow_link
= proc_pid_follow_link
,
1501 .setattr
= proc_setattr
,
1505 /* building an inode */
1507 struct inode
*proc_pid_make_inode(struct super_block
* sb
, struct task_struct
*task
)
1509 struct inode
* inode
;
1510 struct proc_inode
*ei
;
1511 const struct cred
*cred
;
1513 /* We need a new inode */
1515 inode
= new_inode(sb
);
1521 inode
->i_ino
= get_next_ino();
1522 inode
->i_mtime
= inode
->i_atime
= inode
->i_ctime
= CURRENT_TIME
;
1523 inode
->i_op
= &proc_def_inode_operations
;
1526 * grab the reference to task.
1528 ei
->pid
= get_task_pid(task
, PIDTYPE_PID
);
1532 if (task_dumpable(task
)) {
1534 cred
= __task_cred(task
);
1535 inode
->i_uid
= cred
->euid
;
1536 inode
->i_gid
= cred
->egid
;
1539 security_task_to_inode(task
, inode
);
1549 int pid_getattr(struct vfsmount
*mnt
, struct dentry
*dentry
, struct kstat
*stat
)
1551 struct inode
*inode
= dentry
->d_inode
;
1552 struct task_struct
*task
;
1553 const struct cred
*cred
;
1554 struct pid_namespace
*pid
= dentry
->d_sb
->s_fs_info
;
1556 generic_fillattr(inode
, stat
);
1559 stat
->uid
= GLOBAL_ROOT_UID
;
1560 stat
->gid
= GLOBAL_ROOT_GID
;
1561 task
= pid_task(proc_pid(inode
), PIDTYPE_PID
);
1563 if (!has_pid_permissions(pid
, task
, 2)) {
1566 * This doesn't prevent learning whether PID exists,
1567 * it only makes getattr() consistent with readdir().
1571 if ((inode
->i_mode
== (S_IFDIR
|S_IRUGO
|S_IXUGO
)) ||
1572 task_dumpable(task
)) {
1573 cred
= __task_cred(task
);
1574 stat
->uid
= cred
->euid
;
1575 stat
->gid
= cred
->egid
;
1585 * Exceptional case: normally we are not allowed to unhash a busy
1586 * directory. In this case, however, we can do it - no aliasing problems
1587 * due to the way we treat inodes.
1589 * Rewrite the inode's ownerships here because the owning task may have
1590 * performed a setuid(), etc.
1592 * Before the /proc/pid/status file was created the only way to read
1593 * the effective uid of a /process was to stat /proc/pid. Reading
1594 * /proc/pid/status is slow enough that procps and other packages
1595 * kept stating /proc/pid. To keep the rules in /proc simple I have
1596 * made this apply to all per process world readable and executable
1599 int pid_revalidate(struct dentry
*dentry
, unsigned int flags
)
1601 struct inode
*inode
;
1602 struct task_struct
*task
;
1603 const struct cred
*cred
;
1605 if (flags
& LOOKUP_RCU
)
1608 inode
= dentry
->d_inode
;
1609 task
= get_proc_task(inode
);
1612 if ((inode
->i_mode
== (S_IFDIR
|S_IRUGO
|S_IXUGO
)) ||
1613 task_dumpable(task
)) {
1615 cred
= __task_cred(task
);
1616 inode
->i_uid
= cred
->euid
;
1617 inode
->i_gid
= cred
->egid
;
1620 inode
->i_uid
= GLOBAL_ROOT_UID
;
1621 inode
->i_gid
= GLOBAL_ROOT_GID
;
1623 inode
->i_mode
&= ~(S_ISUID
| S_ISGID
);
1624 security_task_to_inode(task
, inode
);
1625 put_task_struct(task
);
1632 static inline bool proc_inode_is_dead(struct inode
*inode
)
1634 return !proc_pid(inode
)->tasks
[PIDTYPE_PID
].first
;
1637 int pid_delete_dentry(const struct dentry
*dentry
)
1639 /* Is the task we represent dead?
1640 * If so, then don't put the dentry on the lru list,
1641 * kill it immediately.
1643 return proc_inode_is_dead(dentry
->d_inode
);
1646 const struct dentry_operations pid_dentry_operations
=
1648 .d_revalidate
= pid_revalidate
,
1649 .d_delete
= pid_delete_dentry
,
1655 * Fill a directory entry.
1657 * If possible create the dcache entry and derive our inode number and
1658 * file type from dcache entry.
1660 * Since all of the proc inode numbers are dynamically generated, the inode
1661 * numbers do not exist until the inode is cache. This means creating the
1662 * the dcache entry in readdir is necessary to keep the inode numbers
1663 * reported by readdir in sync with the inode numbers reported
1666 bool proc_fill_cache(struct file
*file
, struct dir_context
*ctx
,
1667 const char *name
, int len
,
1668 instantiate_t instantiate
, struct task_struct
*task
, const void *ptr
)
1670 struct dentry
*child
, *dir
= file
->f_path
.dentry
;
1671 struct qstr qname
= QSTR_INIT(name
, len
);
1672 struct inode
*inode
;
1676 child
= d_hash_and_lookup(dir
, &qname
);
1678 child
= d_alloc(dir
, &qname
);
1680 goto end_instantiate
;
1681 if (instantiate(dir
->d_inode
, child
, task
, ptr
) < 0) {
1683 goto end_instantiate
;
1686 inode
= child
->d_inode
;
1688 type
= inode
->i_mode
>> 12;
1690 return dir_emit(ctx
, name
, len
, ino
, type
);
1693 return dir_emit(ctx
, name
, len
, 1, DT_UNKNOWN
);
1696 #ifdef CONFIG_CHECKPOINT_RESTORE
1699 * dname_to_vma_addr - maps a dentry name into two unsigned longs
1700 * which represent vma start and end addresses.
1702 static int dname_to_vma_addr(struct dentry
*dentry
,
1703 unsigned long *start
, unsigned long *end
)
1705 if (sscanf(dentry
->d_name
.name
, "%lx-%lx", start
, end
) != 2)
1711 static int map_files_d_revalidate(struct dentry
*dentry
, unsigned int flags
)
1713 unsigned long vm_start
, vm_end
;
1714 bool exact_vma_exists
= false;
1715 struct mm_struct
*mm
= NULL
;
1716 struct task_struct
*task
;
1717 const struct cred
*cred
;
1718 struct inode
*inode
;
1721 if (flags
& LOOKUP_RCU
)
1724 if (!capable(CAP_SYS_ADMIN
)) {
1729 inode
= dentry
->d_inode
;
1730 task
= get_proc_task(inode
);
1734 mm
= mm_access(task
, PTRACE_MODE_READ
);
1735 if (IS_ERR_OR_NULL(mm
))
1738 if (!dname_to_vma_addr(dentry
, &vm_start
, &vm_end
)) {
1739 down_read(&mm
->mmap_sem
);
1740 exact_vma_exists
= !!find_exact_vma(mm
, vm_start
, vm_end
);
1741 up_read(&mm
->mmap_sem
);
1746 if (exact_vma_exists
) {
1747 if (task_dumpable(task
)) {
1749 cred
= __task_cred(task
);
1750 inode
->i_uid
= cred
->euid
;
1751 inode
->i_gid
= cred
->egid
;
1754 inode
->i_uid
= GLOBAL_ROOT_UID
;
1755 inode
->i_gid
= GLOBAL_ROOT_GID
;
1757 security_task_to_inode(task
, inode
);
1762 put_task_struct(task
);
1771 static const struct dentry_operations tid_map_files_dentry_operations
= {
1772 .d_revalidate
= map_files_d_revalidate
,
1773 .d_delete
= pid_delete_dentry
,
1776 static int proc_map_files_get_link(struct dentry
*dentry
, struct path
*path
)
1778 unsigned long vm_start
, vm_end
;
1779 struct vm_area_struct
*vma
;
1780 struct task_struct
*task
;
1781 struct mm_struct
*mm
;
1785 task
= get_proc_task(dentry
->d_inode
);
1789 mm
= get_task_mm(task
);
1790 put_task_struct(task
);
1794 rc
= dname_to_vma_addr(dentry
, &vm_start
, &vm_end
);
1799 down_read(&mm
->mmap_sem
);
1800 vma
= find_exact_vma(mm
, vm_start
, vm_end
);
1801 if (vma
&& vma
->vm_file
) {
1802 *path
= vma
->vm_file
->f_path
;
1806 up_read(&mm
->mmap_sem
);
1814 struct map_files_info
{
1817 unsigned char name
[4*sizeof(long)+2]; /* max: %lx-%lx\0 */
1821 proc_map_files_instantiate(struct inode
*dir
, struct dentry
*dentry
,
1822 struct task_struct
*task
, const void *ptr
)
1824 fmode_t mode
= (fmode_t
)(unsigned long)ptr
;
1825 struct proc_inode
*ei
;
1826 struct inode
*inode
;
1828 inode
= proc_pid_make_inode(dir
->i_sb
, task
);
1833 ei
->op
.proc_get_link
= proc_map_files_get_link
;
1835 inode
->i_op
= &proc_pid_link_inode_operations
;
1837 inode
->i_mode
= S_IFLNK
;
1839 if (mode
& FMODE_READ
)
1840 inode
->i_mode
|= S_IRUSR
;
1841 if (mode
& FMODE_WRITE
)
1842 inode
->i_mode
|= S_IWUSR
;
1844 d_set_d_op(dentry
, &tid_map_files_dentry_operations
);
1845 d_add(dentry
, inode
);
1850 static struct dentry
*proc_map_files_lookup(struct inode
*dir
,
1851 struct dentry
*dentry
, unsigned int flags
)
1853 unsigned long vm_start
, vm_end
;
1854 struct vm_area_struct
*vma
;
1855 struct task_struct
*task
;
1857 struct mm_struct
*mm
;
1860 if (!capable(CAP_SYS_ADMIN
))
1864 task
= get_proc_task(dir
);
1869 if (!ptrace_may_access(task
, PTRACE_MODE_READ
))
1873 if (dname_to_vma_addr(dentry
, &vm_start
, &vm_end
))
1876 mm
= get_task_mm(task
);
1880 down_read(&mm
->mmap_sem
);
1881 vma
= find_exact_vma(mm
, vm_start
, vm_end
);
1886 result
= proc_map_files_instantiate(dir
, dentry
, task
,
1887 (void *)(unsigned long)vma
->vm_file
->f_mode
);
1890 up_read(&mm
->mmap_sem
);
1893 put_task_struct(task
);
1895 return ERR_PTR(result
);
1898 static const struct inode_operations proc_map_files_inode_operations
= {
1899 .lookup
= proc_map_files_lookup
,
1900 .permission
= proc_fd_permission
,
1901 .setattr
= proc_setattr
,
1905 proc_map_files_readdir(struct file
*file
, struct dir_context
*ctx
)
1907 struct vm_area_struct
*vma
;
1908 struct task_struct
*task
;
1909 struct mm_struct
*mm
;
1910 unsigned long nr_files
, pos
, i
;
1911 struct flex_array
*fa
= NULL
;
1912 struct map_files_info info
;
1913 struct map_files_info
*p
;
1917 if (!capable(CAP_SYS_ADMIN
))
1921 task
= get_proc_task(file_inode(file
));
1926 if (!ptrace_may_access(task
, PTRACE_MODE_READ
))
1930 if (!dir_emit_dots(file
, ctx
))
1933 mm
= get_task_mm(task
);
1936 down_read(&mm
->mmap_sem
);
1941 * We need two passes here:
1943 * 1) Collect vmas of mapped files with mmap_sem taken
1944 * 2) Release mmap_sem and instantiate entries
1946 * otherwise we get lockdep complained, since filldir()
1947 * routine might require mmap_sem taken in might_fault().
1950 for (vma
= mm
->mmap
, pos
= 2; vma
; vma
= vma
->vm_next
) {
1951 if (vma
->vm_file
&& ++pos
> ctx
->pos
)
1956 fa
= flex_array_alloc(sizeof(info
), nr_files
,
1958 if (!fa
|| flex_array_prealloc(fa
, 0, nr_files
,
1962 flex_array_free(fa
);
1963 up_read(&mm
->mmap_sem
);
1967 for (i
= 0, vma
= mm
->mmap
, pos
= 2; vma
;
1968 vma
= vma
->vm_next
) {
1971 if (++pos
<= ctx
->pos
)
1974 info
.mode
= vma
->vm_file
->f_mode
;
1975 info
.len
= snprintf(info
.name
,
1976 sizeof(info
.name
), "%lx-%lx",
1977 vma
->vm_start
, vma
->vm_end
);
1978 if (flex_array_put(fa
, i
++, &info
, GFP_KERNEL
))
1982 up_read(&mm
->mmap_sem
);
1984 for (i
= 0; i
< nr_files
; i
++) {
1985 p
= flex_array_get(fa
, i
);
1986 if (!proc_fill_cache(file
, ctx
,
1988 proc_map_files_instantiate
,
1990 (void *)(unsigned long)p
->mode
))
1995 flex_array_free(fa
);
1999 put_task_struct(task
);
2004 static const struct file_operations proc_map_files_operations
= {
2005 .read
= generic_read_dir
,
2006 .iterate
= proc_map_files_readdir
,
2007 .llseek
= default_llseek
,
2010 struct timers_private
{
2012 struct task_struct
*task
;
2013 struct sighand_struct
*sighand
;
2014 struct pid_namespace
*ns
;
2015 unsigned long flags
;
2018 static void *timers_start(struct seq_file
*m
, loff_t
*pos
)
2020 struct timers_private
*tp
= m
->private;
2022 tp
->task
= get_pid_task(tp
->pid
, PIDTYPE_PID
);
2024 return ERR_PTR(-ESRCH
);
2026 tp
->sighand
= lock_task_sighand(tp
->task
, &tp
->flags
);
2028 return ERR_PTR(-ESRCH
);
2030 return seq_list_start(&tp
->task
->signal
->posix_timers
, *pos
);
2033 static void *timers_next(struct seq_file
*m
, void *v
, loff_t
*pos
)
2035 struct timers_private
*tp
= m
->private;
2036 return seq_list_next(v
, &tp
->task
->signal
->posix_timers
, pos
);
2039 static void timers_stop(struct seq_file
*m
, void *v
)
2041 struct timers_private
*tp
= m
->private;
2044 unlock_task_sighand(tp
->task
, &tp
->flags
);
2049 put_task_struct(tp
->task
);
2054 static int show_timer(struct seq_file
*m
, void *v
)
2056 struct k_itimer
*timer
;
2057 struct timers_private
*tp
= m
->private;
2059 static char *nstr
[] = {
2060 [SIGEV_SIGNAL
] = "signal",
2061 [SIGEV_NONE
] = "none",
2062 [SIGEV_THREAD
] = "thread",
2065 timer
= list_entry((struct list_head
*)v
, struct k_itimer
, list
);
2066 notify
= timer
->it_sigev_notify
;
2068 seq_printf(m
, "ID: %d\n", timer
->it_id
);
2069 seq_printf(m
, "signal: %d/%p\n", timer
->sigq
->info
.si_signo
,
2070 timer
->sigq
->info
.si_value
.sival_ptr
);
2071 seq_printf(m
, "notify: %s/%s.%d\n",
2072 nstr
[notify
& ~SIGEV_THREAD_ID
],
2073 (notify
& SIGEV_THREAD_ID
) ? "tid" : "pid",
2074 pid_nr_ns(timer
->it_pid
, tp
->ns
));
2075 seq_printf(m
, "ClockID: %d\n", timer
->it_clock
);
2080 static const struct seq_operations proc_timers_seq_ops
= {
2081 .start
= timers_start
,
2082 .next
= timers_next
,
2083 .stop
= timers_stop
,
2087 static int proc_timers_open(struct inode
*inode
, struct file
*file
)
2089 struct timers_private
*tp
;
2091 tp
= __seq_open_private(file
, &proc_timers_seq_ops
,
2092 sizeof(struct timers_private
));
2096 tp
->pid
= proc_pid(inode
);
2097 tp
->ns
= inode
->i_sb
->s_fs_info
;
2101 static const struct file_operations proc_timers_operations
= {
2102 .open
= proc_timers_open
,
2104 .llseek
= seq_lseek
,
2105 .release
= seq_release_private
,
2107 #endif /* CONFIG_CHECKPOINT_RESTORE */
2109 static int proc_pident_instantiate(struct inode
*dir
,
2110 struct dentry
*dentry
, struct task_struct
*task
, const void *ptr
)
2112 const struct pid_entry
*p
= ptr
;
2113 struct inode
*inode
;
2114 struct proc_inode
*ei
;
2116 inode
= proc_pid_make_inode(dir
->i_sb
, task
);
2121 inode
->i_mode
= p
->mode
;
2122 if (S_ISDIR(inode
->i_mode
))
2123 set_nlink(inode
, 2); /* Use getattr to fix if necessary */
2125 inode
->i_op
= p
->iop
;
2127 inode
->i_fop
= p
->fop
;
2129 d_set_d_op(dentry
, &pid_dentry_operations
);
2130 d_add(dentry
, inode
);
2131 /* Close the race of the process dying before we return the dentry */
2132 if (pid_revalidate(dentry
, 0))
2138 static struct dentry
*proc_pident_lookup(struct inode
*dir
,
2139 struct dentry
*dentry
,
2140 const struct pid_entry
*ents
,
2144 struct task_struct
*task
= get_proc_task(dir
);
2145 const struct pid_entry
*p
, *last
;
2153 * Yes, it does not scale. And it should not. Don't add
2154 * new entries into /proc/<tgid>/ without very good reasons.
2156 last
= &ents
[nents
- 1];
2157 for (p
= ents
; p
<= last
; p
++) {
2158 if (p
->len
!= dentry
->d_name
.len
)
2160 if (!memcmp(dentry
->d_name
.name
, p
->name
, p
->len
))
2166 error
= proc_pident_instantiate(dir
, dentry
, task
, p
);
2168 put_task_struct(task
);
2170 return ERR_PTR(error
);
2173 static int proc_pident_readdir(struct file
*file
, struct dir_context
*ctx
,
2174 const struct pid_entry
*ents
, unsigned int nents
)
2176 struct task_struct
*task
= get_proc_task(file_inode(file
));
2177 const struct pid_entry
*p
;
2182 if (!dir_emit_dots(file
, ctx
))
2185 if (ctx
->pos
>= nents
+ 2)
2188 for (p
= ents
+ (ctx
->pos
- 2); p
<= ents
+ nents
- 1; p
++) {
2189 if (!proc_fill_cache(file
, ctx
, p
->name
, p
->len
,
2190 proc_pident_instantiate
, task
, p
))
2195 put_task_struct(task
);
2199 #ifdef CONFIG_SECURITY
2200 static ssize_t
proc_pid_attr_read(struct file
* file
, char __user
* buf
,
2201 size_t count
, loff_t
*ppos
)
2203 struct inode
* inode
= file_inode(file
);
2206 struct task_struct
*task
= get_proc_task(inode
);
2211 length
= security_getprocattr(task
,
2212 (char*)file
->f_path
.dentry
->d_name
.name
,
2214 put_task_struct(task
);
2216 length
= simple_read_from_buffer(buf
, count
, ppos
, p
, length
);
2221 static ssize_t
proc_pid_attr_write(struct file
* file
, const char __user
* buf
,
2222 size_t count
, loff_t
*ppos
)
2224 struct inode
* inode
= file_inode(file
);
2227 struct task_struct
*task
= get_proc_task(inode
);
2232 if (count
> PAGE_SIZE
)
2235 /* No partial writes. */
2241 page
= (char*)__get_free_page(GFP_TEMPORARY
);
2246 if (copy_from_user(page
, buf
, count
))
2249 /* Guard against adverse ptrace interaction */
2250 length
= mutex_lock_interruptible(&task
->signal
->cred_guard_mutex
);
2254 length
= security_setprocattr(task
,
2255 (char*)file
->f_path
.dentry
->d_name
.name
,
2256 (void*)page
, count
);
2257 mutex_unlock(&task
->signal
->cred_guard_mutex
);
2259 free_page((unsigned long) page
);
2261 put_task_struct(task
);
2266 static const struct file_operations proc_pid_attr_operations
= {
2267 .read
= proc_pid_attr_read
,
2268 .write
= proc_pid_attr_write
,
2269 .llseek
= generic_file_llseek
,
2272 static const struct pid_entry attr_dir_stuff
[] = {
2273 REG("current", S_IRUGO
|S_IWUGO
, proc_pid_attr_operations
),
2274 REG("prev", S_IRUGO
, proc_pid_attr_operations
),
2275 REG("exec", S_IRUGO
|S_IWUGO
, proc_pid_attr_operations
),
2276 REG("fscreate", S_IRUGO
|S_IWUGO
, proc_pid_attr_operations
),
2277 REG("keycreate", S_IRUGO
|S_IWUGO
, proc_pid_attr_operations
),
2278 REG("sockcreate", S_IRUGO
|S_IWUGO
, proc_pid_attr_operations
),
2281 static int proc_attr_dir_readdir(struct file
*file
, struct dir_context
*ctx
)
2283 return proc_pident_readdir(file
, ctx
,
2284 attr_dir_stuff
, ARRAY_SIZE(attr_dir_stuff
));
2287 static const struct file_operations proc_attr_dir_operations
= {
2288 .read
= generic_read_dir
,
2289 .iterate
= proc_attr_dir_readdir
,
2290 .llseek
= default_llseek
,
2293 static struct dentry
*proc_attr_dir_lookup(struct inode
*dir
,
2294 struct dentry
*dentry
, unsigned int flags
)
2296 return proc_pident_lookup(dir
, dentry
,
2297 attr_dir_stuff
, ARRAY_SIZE(attr_dir_stuff
));
2300 static const struct inode_operations proc_attr_dir_inode_operations
= {
2301 .lookup
= proc_attr_dir_lookup
,
2302 .getattr
= pid_getattr
,
2303 .setattr
= proc_setattr
,
2308 #ifdef CONFIG_ELF_CORE
2309 static ssize_t
proc_coredump_filter_read(struct file
*file
, char __user
*buf
,
2310 size_t count
, loff_t
*ppos
)
2312 struct task_struct
*task
= get_proc_task(file_inode(file
));
2313 struct mm_struct
*mm
;
2314 char buffer
[PROC_NUMBUF
];
2322 mm
= get_task_mm(task
);
2324 len
= snprintf(buffer
, sizeof(buffer
), "%08lx\n",
2325 ((mm
->flags
& MMF_DUMP_FILTER_MASK
) >>
2326 MMF_DUMP_FILTER_SHIFT
));
2328 ret
= simple_read_from_buffer(buf
, count
, ppos
, buffer
, len
);
2331 put_task_struct(task
);
2336 static ssize_t
proc_coredump_filter_write(struct file
*file
,
2337 const char __user
*buf
,
2341 struct task_struct
*task
;
2342 struct mm_struct
*mm
;
2343 char buffer
[PROC_NUMBUF
], *end
;
2350 memset(buffer
, 0, sizeof(buffer
));
2351 if (count
> sizeof(buffer
) - 1)
2352 count
= sizeof(buffer
) - 1;
2353 if (copy_from_user(buffer
, buf
, count
))
2357 val
= (unsigned int)simple_strtoul(buffer
, &end
, 0);
2360 if (end
- buffer
== 0)
2364 task
= get_proc_task(file_inode(file
));
2369 mm
= get_task_mm(task
);
2373 for (i
= 0, mask
= 1; i
< MMF_DUMP_FILTER_BITS
; i
++, mask
<<= 1) {
2375 set_bit(i
+ MMF_DUMP_FILTER_SHIFT
, &mm
->flags
);
2377 clear_bit(i
+ MMF_DUMP_FILTER_SHIFT
, &mm
->flags
);
2382 put_task_struct(task
);
2387 static const struct file_operations proc_coredump_filter_operations
= {
2388 .read
= proc_coredump_filter_read
,
2389 .write
= proc_coredump_filter_write
,
2390 .llseek
= generic_file_llseek
,
2394 #ifdef CONFIG_TASK_IO_ACCOUNTING
2395 static int do_io_accounting(struct task_struct
*task
, char *buffer
, int whole
)
2397 struct task_io_accounting acct
= task
->ioac
;
2398 unsigned long flags
;
2401 result
= mutex_lock_killable(&task
->signal
->cred_guard_mutex
);
2405 if (!ptrace_may_access(task
, PTRACE_MODE_READ
)) {
2410 if (whole
&& lock_task_sighand(task
, &flags
)) {
2411 struct task_struct
*t
= task
;
2413 task_io_accounting_add(&acct
, &task
->signal
->ioac
);
2414 while_each_thread(task
, t
)
2415 task_io_accounting_add(&acct
, &t
->ioac
);
2417 unlock_task_sighand(task
, &flags
);
2419 result
= sprintf(buffer
,
2424 "read_bytes: %llu\n"
2425 "write_bytes: %llu\n"
2426 "cancelled_write_bytes: %llu\n",
2427 (unsigned long long)acct
.rchar
,
2428 (unsigned long long)acct
.wchar
,
2429 (unsigned long long)acct
.syscr
,
2430 (unsigned long long)acct
.syscw
,
2431 (unsigned long long)acct
.read_bytes
,
2432 (unsigned long long)acct
.write_bytes
,
2433 (unsigned long long)acct
.cancelled_write_bytes
);
2435 mutex_unlock(&task
->signal
->cred_guard_mutex
);
2439 static int proc_tid_io_accounting(struct task_struct
*task
, char *buffer
)
2441 return do_io_accounting(task
, buffer
, 0);
2444 static int proc_tgid_io_accounting(struct task_struct
*task
, char *buffer
)
2446 return do_io_accounting(task
, buffer
, 1);
2448 #endif /* CONFIG_TASK_IO_ACCOUNTING */
2450 #ifdef CONFIG_USER_NS
2451 static int proc_id_map_open(struct inode
*inode
, struct file
*file
,
2452 const struct seq_operations
*seq_ops
)
2454 struct user_namespace
*ns
= NULL
;
2455 struct task_struct
*task
;
2456 struct seq_file
*seq
;
2459 task
= get_proc_task(inode
);
2462 ns
= get_user_ns(task_cred_xxx(task
, user_ns
));
2464 put_task_struct(task
);
2469 ret
= seq_open(file
, seq_ops
);
2473 seq
= file
->private_data
;
2483 static int proc_id_map_release(struct inode
*inode
, struct file
*file
)
2485 struct seq_file
*seq
= file
->private_data
;
2486 struct user_namespace
*ns
= seq
->private;
2488 return seq_release(inode
, file
);
2491 static int proc_uid_map_open(struct inode
*inode
, struct file
*file
)
2493 return proc_id_map_open(inode
, file
, &proc_uid_seq_operations
);
2496 static int proc_gid_map_open(struct inode
*inode
, struct file
*file
)
2498 return proc_id_map_open(inode
, file
, &proc_gid_seq_operations
);
2501 static int proc_projid_map_open(struct inode
*inode
, struct file
*file
)
2503 return proc_id_map_open(inode
, file
, &proc_projid_seq_operations
);
2506 static const struct file_operations proc_uid_map_operations
= {
2507 .open
= proc_uid_map_open
,
2508 .write
= proc_uid_map_write
,
2510 .llseek
= seq_lseek
,
2511 .release
= proc_id_map_release
,
2514 static const struct file_operations proc_gid_map_operations
= {
2515 .open
= proc_gid_map_open
,
2516 .write
= proc_gid_map_write
,
2518 .llseek
= seq_lseek
,
2519 .release
= proc_id_map_release
,
2522 static const struct file_operations proc_projid_map_operations
= {
2523 .open
= proc_projid_map_open
,
2524 .write
= proc_projid_map_write
,
2526 .llseek
= seq_lseek
,
2527 .release
= proc_id_map_release
,
2529 #endif /* CONFIG_USER_NS */
2531 static int proc_pid_personality(struct seq_file
*m
, struct pid_namespace
*ns
,
2532 struct pid
*pid
, struct task_struct
*task
)
2534 int err
= lock_trace(task
);
2536 seq_printf(m
, "%08x\n", task
->personality
);
2545 static const struct file_operations proc_task_operations
;
2546 static const struct inode_operations proc_task_inode_operations
;
2548 static const struct pid_entry tgid_base_stuff
[] = {
2549 DIR("task", S_IRUGO
|S_IXUGO
, proc_task_inode_operations
, proc_task_operations
),
2550 DIR("fd", S_IRUSR
|S_IXUSR
, proc_fd_inode_operations
, proc_fd_operations
),
2551 #ifdef CONFIG_CHECKPOINT_RESTORE
2552 DIR("map_files", S_IRUSR
|S_IXUSR
, proc_map_files_inode_operations
, proc_map_files_operations
),
2554 DIR("fdinfo", S_IRUSR
|S_IXUSR
, proc_fdinfo_inode_operations
, proc_fdinfo_operations
),
2555 DIR("ns", S_IRUSR
|S_IXUGO
, proc_ns_dir_inode_operations
, proc_ns_dir_operations
),
2557 DIR("net", S_IRUGO
|S_IXUGO
, proc_net_inode_operations
, proc_net_operations
),
2559 REG("environ", S_IRUSR
, proc_environ_operations
),
2560 INF("auxv", S_IRUSR
, proc_pid_auxv
),
2561 ONE("status", S_IRUGO
, proc_pid_status
),
2562 ONE("personality", S_IRUSR
, proc_pid_personality
),
2563 INF("limits", S_IRUGO
, proc_pid_limits
),
2564 #ifdef CONFIG_SCHED_DEBUG
2565 REG("sched", S_IRUGO
|S_IWUSR
, proc_pid_sched_operations
),
2567 #ifdef CONFIG_SCHED_AUTOGROUP
2568 REG("autogroup", S_IRUGO
|S_IWUSR
, proc_pid_sched_autogroup_operations
),
2570 REG("comm", S_IRUGO
|S_IWUSR
, proc_pid_set_comm_operations
),
2571 #ifdef CONFIG_HAVE_ARCH_TRACEHOOK
2572 INF("syscall", S_IRUSR
, proc_pid_syscall
),
2574 INF("cmdline", S_IRUGO
, proc_pid_cmdline
),
2575 ONE("stat", S_IRUGO
, proc_tgid_stat
),
2576 ONE("statm", S_IRUGO
, proc_pid_statm
),
2577 REG("maps", S_IRUGO
, proc_pid_maps_operations
),
2579 REG("numa_maps", S_IRUGO
, proc_pid_numa_maps_operations
),
2581 REG("mem", S_IRUSR
|S_IWUSR
, proc_mem_operations
),
2582 LNK("cwd", proc_cwd_link
),
2583 LNK("root", proc_root_link
),
2584 LNK("exe", proc_exe_link
),
2585 REG("mounts", S_IRUGO
, proc_mounts_operations
),
2586 REG("mountinfo", S_IRUGO
, proc_mountinfo_operations
),
2587 REG("mountstats", S_IRUSR
, proc_mountstats_operations
),
2588 #ifdef CONFIG_PROC_PAGE_MONITOR
2589 REG("clear_refs", S_IWUSR
, proc_clear_refs_operations
),
2590 REG("smaps", S_IRUGO
, proc_pid_smaps_operations
),
2591 REG("pagemap", S_IRUSR
, proc_pagemap_operations
),
2593 #ifdef CONFIG_SECURITY
2594 DIR("attr", S_IRUGO
|S_IXUGO
, proc_attr_dir_inode_operations
, proc_attr_dir_operations
),
2596 #ifdef CONFIG_KALLSYMS
2597 INF("wchan", S_IRUGO
, proc_pid_wchan
),
2599 #ifdef CONFIG_STACKTRACE
2600 ONE("stack", S_IRUSR
, proc_pid_stack
),
2602 #ifdef CONFIG_SCHEDSTATS
2603 INF("schedstat", S_IRUGO
, proc_pid_schedstat
),
2605 #ifdef CONFIG_LATENCYTOP
2606 REG("latency", S_IRUGO
, proc_lstats_operations
),
2608 #ifdef CONFIG_PROC_PID_CPUSET
2609 REG("cpuset", S_IRUGO
, proc_cpuset_operations
),
2611 #ifdef CONFIG_CGROUPS
2612 REG("cgroup", S_IRUGO
, proc_cgroup_operations
),
2614 INF("oom_score", S_IRUGO
, proc_oom_score
),
2615 REG("oom_adj", S_IRUGO
|S_IWUSR
, proc_oom_adj_operations
),
2616 REG("oom_score_adj", S_IRUGO
|S_IWUSR
, proc_oom_score_adj_operations
),
2617 #ifdef CONFIG_AUDITSYSCALL
2618 REG("loginuid", S_IWUSR
|S_IRUGO
, proc_loginuid_operations
),
2619 REG("sessionid", S_IRUGO
, proc_sessionid_operations
),
2621 #ifdef CONFIG_FAULT_INJECTION
2622 REG("make-it-fail", S_IRUGO
|S_IWUSR
, proc_fault_inject_operations
),
2624 #ifdef CONFIG_ELF_CORE
2625 REG("coredump_filter", S_IRUGO
|S_IWUSR
, proc_coredump_filter_operations
),
2627 #ifdef CONFIG_TASK_IO_ACCOUNTING
2628 INF("io", S_IRUSR
, proc_tgid_io_accounting
),
2630 #ifdef CONFIG_HARDWALL
2631 INF("hardwall", S_IRUGO
, proc_pid_hardwall
),
2633 #ifdef CONFIG_USER_NS
2634 REG("uid_map", S_IRUGO
|S_IWUSR
, proc_uid_map_operations
),
2635 REG("gid_map", S_IRUGO
|S_IWUSR
, proc_gid_map_operations
),
2636 REG("projid_map", S_IRUGO
|S_IWUSR
, proc_projid_map_operations
),
2638 #ifdef CONFIG_CHECKPOINT_RESTORE
2639 REG("timers", S_IRUGO
, proc_timers_operations
),
2643 static int proc_tgid_base_readdir(struct file
*file
, struct dir_context
*ctx
)
2645 return proc_pident_readdir(file
, ctx
,
2646 tgid_base_stuff
, ARRAY_SIZE(tgid_base_stuff
));
2649 static const struct file_operations proc_tgid_base_operations
= {
2650 .read
= generic_read_dir
,
2651 .iterate
= proc_tgid_base_readdir
,
2652 .llseek
= default_llseek
,
2655 static struct dentry
*proc_tgid_base_lookup(struct inode
*dir
, struct dentry
*dentry
, unsigned int flags
)
2657 return proc_pident_lookup(dir
, dentry
,
2658 tgid_base_stuff
, ARRAY_SIZE(tgid_base_stuff
));
2661 static const struct inode_operations proc_tgid_base_inode_operations
= {
2662 .lookup
= proc_tgid_base_lookup
,
2663 .getattr
= pid_getattr
,
2664 .setattr
= proc_setattr
,
2665 .permission
= proc_pid_permission
,
2668 static void proc_flush_task_mnt(struct vfsmount
*mnt
, pid_t pid
, pid_t tgid
)
2670 struct dentry
*dentry
, *leader
, *dir
;
2671 char buf
[PROC_NUMBUF
];
2675 name
.len
= snprintf(buf
, sizeof(buf
), "%d", pid
);
2676 /* no ->d_hash() rejects on procfs */
2677 dentry
= d_hash_and_lookup(mnt
->mnt_root
, &name
);
2679 shrink_dcache_parent(dentry
);
2685 name
.len
= snprintf(buf
, sizeof(buf
), "%d", tgid
);
2686 leader
= d_hash_and_lookup(mnt
->mnt_root
, &name
);
2691 name
.len
= strlen(name
.name
);
2692 dir
= d_hash_and_lookup(leader
, &name
);
2694 goto out_put_leader
;
2697 name
.len
= snprintf(buf
, sizeof(buf
), "%d", pid
);
2698 dentry
= d_hash_and_lookup(dir
, &name
);
2700 shrink_dcache_parent(dentry
);
2713 * proc_flush_task - Remove dcache entries for @task from the /proc dcache.
2714 * @task: task that should be flushed.
2716 * When flushing dentries from proc, one needs to flush them from global
2717 * proc (proc_mnt) and from all the namespaces' procs this task was seen
2718 * in. This call is supposed to do all of this job.
2720 * Looks in the dcache for
2722 * /proc/@tgid/task/@pid
2723 * if either directory is present flushes it and all of it'ts children
2726 * It is safe and reasonable to cache /proc entries for a task until
2727 * that task exits. After that they just clog up the dcache with
2728 * useless entries, possibly causing useful dcache entries to be
2729 * flushed instead. This routine is proved to flush those useless
2730 * dcache entries at process exit time.
2732 * NOTE: This routine is just an optimization so it does not guarantee
2733 * that no dcache entries will exist at process exit time it
2734 * just makes it very unlikely that any will persist.
2737 void proc_flush_task(struct task_struct
*task
)
2740 struct pid
*pid
, *tgid
;
2743 pid
= task_pid(task
);
2744 tgid
= task_tgid(task
);
2746 for (i
= 0; i
<= pid
->level
; i
++) {
2747 upid
= &pid
->numbers
[i
];
2748 proc_flush_task_mnt(upid
->ns
->proc_mnt
, upid
->nr
,
2749 tgid
->numbers
[i
].nr
);
2753 static int proc_pid_instantiate(struct inode
*dir
,
2754 struct dentry
* dentry
,
2755 struct task_struct
*task
, const void *ptr
)
2757 struct inode
*inode
;
2759 inode
= proc_pid_make_inode(dir
->i_sb
, task
);
2763 inode
->i_mode
= S_IFDIR
|S_IRUGO
|S_IXUGO
;
2764 inode
->i_op
= &proc_tgid_base_inode_operations
;
2765 inode
->i_fop
= &proc_tgid_base_operations
;
2766 inode
->i_flags
|=S_IMMUTABLE
;
2768 set_nlink(inode
, 2 + pid_entry_count_dirs(tgid_base_stuff
,
2769 ARRAY_SIZE(tgid_base_stuff
)));
2771 d_set_d_op(dentry
, &pid_dentry_operations
);
2773 d_add(dentry
, inode
);
2774 /* Close the race of the process dying before we return the dentry */
2775 if (pid_revalidate(dentry
, 0))
2781 struct dentry
*proc_pid_lookup(struct inode
*dir
, struct dentry
* dentry
, unsigned int flags
)
2784 struct task_struct
*task
;
2786 struct pid_namespace
*ns
;
2788 tgid
= name_to_int(dentry
);
2792 ns
= dentry
->d_sb
->s_fs_info
;
2794 task
= find_task_by_pid_ns(tgid
, ns
);
2796 get_task_struct(task
);
2801 result
= proc_pid_instantiate(dir
, dentry
, task
, NULL
);
2802 put_task_struct(task
);
2804 return ERR_PTR(result
);
2808 * Find the first task with tgid >= tgid
2813 struct task_struct
*task
;
2815 static struct tgid_iter
next_tgid(struct pid_namespace
*ns
, struct tgid_iter iter
)
2820 put_task_struct(iter
.task
);
2824 pid
= find_ge_pid(iter
.tgid
, ns
);
2826 iter
.tgid
= pid_nr_ns(pid
, ns
);
2827 iter
.task
= pid_task(pid
, PIDTYPE_PID
);
2828 /* What we to know is if the pid we have find is the
2829 * pid of a thread_group_leader. Testing for task
2830 * being a thread_group_leader is the obvious thing
2831 * todo but there is a window when it fails, due to
2832 * the pid transfer logic in de_thread.
2834 * So we perform the straight forward test of seeing
2835 * if the pid we have found is the pid of a thread
2836 * group leader, and don't worry if the task we have
2837 * found doesn't happen to be a thread group leader.
2838 * As we don't care in the case of readdir.
2840 if (!iter
.task
|| !has_group_leader_pid(iter
.task
)) {
2844 get_task_struct(iter
.task
);
2850 #define TGID_OFFSET (FIRST_PROCESS_ENTRY + 1)
2852 /* for the /proc/ directory itself, after non-process stuff has been done */
2853 int proc_pid_readdir(struct file
*file
, struct dir_context
*ctx
)
2855 struct tgid_iter iter
;
2856 struct pid_namespace
*ns
= file
->f_dentry
->d_sb
->s_fs_info
;
2857 loff_t pos
= ctx
->pos
;
2859 if (pos
>= PID_MAX_LIMIT
+ TGID_OFFSET
)
2862 if (pos
== TGID_OFFSET
- 1) {
2863 struct inode
*inode
= ns
->proc_self
->d_inode
;
2864 if (!dir_emit(ctx
, "self", 4, inode
->i_ino
, DT_LNK
))
2868 iter
.tgid
= pos
- TGID_OFFSET
;
2871 for (iter
= next_tgid(ns
, iter
);
2873 iter
.tgid
+= 1, iter
= next_tgid(ns
, iter
)) {
2874 char name
[PROC_NUMBUF
];
2876 if (!has_pid_permissions(ns
, iter
.task
, 2))
2879 len
= snprintf(name
, sizeof(name
), "%d", iter
.tgid
);
2880 ctx
->pos
= iter
.tgid
+ TGID_OFFSET
;
2881 if (!proc_fill_cache(file
, ctx
, name
, len
,
2882 proc_pid_instantiate
, iter
.task
, NULL
)) {
2883 put_task_struct(iter
.task
);
2887 ctx
->pos
= PID_MAX_LIMIT
+ TGID_OFFSET
;
2894 static const struct pid_entry tid_base_stuff
[] = {
2895 DIR("fd", S_IRUSR
|S_IXUSR
, proc_fd_inode_operations
, proc_fd_operations
),
2896 DIR("fdinfo", S_IRUSR
|S_IXUSR
, proc_fdinfo_inode_operations
, proc_fdinfo_operations
),
2897 DIR("ns", S_IRUSR
|S_IXUGO
, proc_ns_dir_inode_operations
, proc_ns_dir_operations
),
2898 REG("environ", S_IRUSR
, proc_environ_operations
),
2899 INF("auxv", S_IRUSR
, proc_pid_auxv
),
2900 ONE("status", S_IRUGO
, proc_pid_status
),
2901 ONE("personality", S_IRUSR
, proc_pid_personality
),
2902 INF("limits", S_IRUGO
, proc_pid_limits
),
2903 #ifdef CONFIG_SCHED_DEBUG
2904 REG("sched", S_IRUGO
|S_IWUSR
, proc_pid_sched_operations
),
2906 REG("comm", S_IRUGO
|S_IWUSR
, proc_pid_set_comm_operations
),
2907 #ifdef CONFIG_HAVE_ARCH_TRACEHOOK
2908 INF("syscall", S_IRUSR
, proc_pid_syscall
),
2910 INF("cmdline", S_IRUGO
, proc_pid_cmdline
),
2911 ONE("stat", S_IRUGO
, proc_tid_stat
),
2912 ONE("statm", S_IRUGO
, proc_pid_statm
),
2913 REG("maps", S_IRUGO
, proc_tid_maps_operations
),
2914 #ifdef CONFIG_CHECKPOINT_RESTORE
2915 REG("children", S_IRUGO
, proc_tid_children_operations
),
2918 REG("numa_maps", S_IRUGO
, proc_tid_numa_maps_operations
),
2920 REG("mem", S_IRUSR
|S_IWUSR
, proc_mem_operations
),
2921 LNK("cwd", proc_cwd_link
),
2922 LNK("root", proc_root_link
),
2923 LNK("exe", proc_exe_link
),
2924 REG("mounts", S_IRUGO
, proc_mounts_operations
),
2925 REG("mountinfo", S_IRUGO
, proc_mountinfo_operations
),
2926 #ifdef CONFIG_PROC_PAGE_MONITOR
2927 REG("clear_refs", S_IWUSR
, proc_clear_refs_operations
),
2928 REG("smaps", S_IRUGO
, proc_tid_smaps_operations
),
2929 REG("pagemap", S_IRUSR
, proc_pagemap_operations
),
2931 #ifdef CONFIG_SECURITY
2932 DIR("attr", S_IRUGO
|S_IXUGO
, proc_attr_dir_inode_operations
, proc_attr_dir_operations
),
2934 #ifdef CONFIG_KALLSYMS
2935 INF("wchan", S_IRUGO
, proc_pid_wchan
),
2937 #ifdef CONFIG_STACKTRACE
2938 ONE("stack", S_IRUSR
, proc_pid_stack
),
2940 #ifdef CONFIG_SCHEDSTATS
2941 INF("schedstat", S_IRUGO
, proc_pid_schedstat
),
2943 #ifdef CONFIG_LATENCYTOP
2944 REG("latency", S_IRUGO
, proc_lstats_operations
),
2946 #ifdef CONFIG_PROC_PID_CPUSET
2947 REG("cpuset", S_IRUGO
, proc_cpuset_operations
),
2949 #ifdef CONFIG_CGROUPS
2950 REG("cgroup", S_IRUGO
, proc_cgroup_operations
),
2952 INF("oom_score", S_IRUGO
, proc_oom_score
),
2953 REG("oom_adj", S_IRUGO
|S_IWUSR
, proc_oom_adj_operations
),
2954 REG("oom_score_adj", S_IRUGO
|S_IWUSR
, proc_oom_score_adj_operations
),
2955 #ifdef CONFIG_AUDITSYSCALL
2956 REG("loginuid", S_IWUSR
|S_IRUGO
, proc_loginuid_operations
),
2957 REG("sessionid", S_IRUGO
, proc_sessionid_operations
),
2959 #ifdef CONFIG_FAULT_INJECTION
2960 REG("make-it-fail", S_IRUGO
|S_IWUSR
, proc_fault_inject_operations
),
2962 #ifdef CONFIG_TASK_IO_ACCOUNTING
2963 INF("io", S_IRUSR
, proc_tid_io_accounting
),
2965 #ifdef CONFIG_HARDWALL
2966 INF("hardwall", S_IRUGO
, proc_pid_hardwall
),
2968 #ifdef CONFIG_USER_NS
2969 REG("uid_map", S_IRUGO
|S_IWUSR
, proc_uid_map_operations
),
2970 REG("gid_map", S_IRUGO
|S_IWUSR
, proc_gid_map_operations
),
2971 REG("projid_map", S_IRUGO
|S_IWUSR
, proc_projid_map_operations
),
2975 static int proc_tid_base_readdir(struct file
*file
, struct dir_context
*ctx
)
2977 return proc_pident_readdir(file
, ctx
,
2978 tid_base_stuff
, ARRAY_SIZE(tid_base_stuff
));
2981 static struct dentry
*proc_tid_base_lookup(struct inode
*dir
, struct dentry
*dentry
, unsigned int flags
)
2983 return proc_pident_lookup(dir
, dentry
,
2984 tid_base_stuff
, ARRAY_SIZE(tid_base_stuff
));
2987 static const struct file_operations proc_tid_base_operations
= {
2988 .read
= generic_read_dir
,
2989 .iterate
= proc_tid_base_readdir
,
2990 .llseek
= default_llseek
,
2993 static const struct inode_operations proc_tid_base_inode_operations
= {
2994 .lookup
= proc_tid_base_lookup
,
2995 .getattr
= pid_getattr
,
2996 .setattr
= proc_setattr
,
2999 static int proc_task_instantiate(struct inode
*dir
,
3000 struct dentry
*dentry
, struct task_struct
*task
, const void *ptr
)
3002 struct inode
*inode
;
3003 inode
= proc_pid_make_inode(dir
->i_sb
, task
);
3007 inode
->i_mode
= S_IFDIR
|S_IRUGO
|S_IXUGO
;
3008 inode
->i_op
= &proc_tid_base_inode_operations
;
3009 inode
->i_fop
= &proc_tid_base_operations
;
3010 inode
->i_flags
|=S_IMMUTABLE
;
3012 set_nlink(inode
, 2 + pid_entry_count_dirs(tid_base_stuff
,
3013 ARRAY_SIZE(tid_base_stuff
)));
3015 d_set_d_op(dentry
, &pid_dentry_operations
);
3017 d_add(dentry
, inode
);
3018 /* Close the race of the process dying before we return the dentry */
3019 if (pid_revalidate(dentry
, 0))
3025 static struct dentry
*proc_task_lookup(struct inode
*dir
, struct dentry
* dentry
, unsigned int flags
)
3027 int result
= -ENOENT
;
3028 struct task_struct
*task
;
3029 struct task_struct
*leader
= get_proc_task(dir
);
3031 struct pid_namespace
*ns
;
3036 tid
= name_to_int(dentry
);
3040 ns
= dentry
->d_sb
->s_fs_info
;
3042 task
= find_task_by_pid_ns(tid
, ns
);
3044 get_task_struct(task
);
3048 if (!same_thread_group(leader
, task
))
3051 result
= proc_task_instantiate(dir
, dentry
, task
, NULL
);
3053 put_task_struct(task
);
3055 put_task_struct(leader
);
3057 return ERR_PTR(result
);
3061 * Find the first tid of a thread group to return to user space.
3063 * Usually this is just the thread group leader, but if the users
3064 * buffer was too small or there was a seek into the middle of the
3065 * directory we have more work todo.
3067 * In the case of a short read we start with find_task_by_pid.
3069 * In the case of a seek we start with the leader and walk nr
3072 static struct task_struct
*first_tid(struct pid
*pid
, int tid
, loff_t f_pos
,
3073 struct pid_namespace
*ns
)
3075 struct task_struct
*pos
, *task
;
3076 unsigned long nr
= f_pos
;
3078 if (nr
!= f_pos
) /* 32bit overflow? */
3082 task
= pid_task(pid
, PIDTYPE_PID
);
3086 /* Attempt to start with the tid of a thread */
3088 pos
= find_task_by_pid_ns(tid
, ns
);
3089 if (pos
&& same_thread_group(pos
, task
))
3093 /* If nr exceeds the number of threads there is nothing todo */
3094 if (nr
>= get_nr_threads(task
))
3097 /* If we haven't found our starting place yet start
3098 * with the leader and walk nr threads forward.
3100 pos
= task
= task
->group_leader
;
3104 } while_each_thread(task
, pos
);
3109 get_task_struct(pos
);
3116 * Find the next thread in the thread list.
3117 * Return NULL if there is an error or no next thread.
3119 * The reference to the input task_struct is released.
3121 static struct task_struct
*next_tid(struct task_struct
*start
)
3123 struct task_struct
*pos
= NULL
;
3125 if (pid_alive(start
)) {
3126 pos
= next_thread(start
);
3127 if (thread_group_leader(pos
))
3130 get_task_struct(pos
);
3133 put_task_struct(start
);
3137 /* for the /proc/TGID/task/ directories */
3138 static int proc_task_readdir(struct file
*file
, struct dir_context
*ctx
)
3140 struct inode
*inode
= file_inode(file
);
3141 struct task_struct
*task
;
3142 struct pid_namespace
*ns
;
3145 if (proc_inode_is_dead(inode
))
3148 if (!dir_emit_dots(file
, ctx
))
3151 /* f_version caches the tgid value that the last readdir call couldn't
3152 * return. lseek aka telldir automagically resets f_version to 0.
3154 ns
= file
->f_dentry
->d_sb
->s_fs_info
;
3155 tid
= (int)file
->f_version
;
3156 file
->f_version
= 0;
3157 for (task
= first_tid(proc_pid(inode
), tid
, ctx
->pos
- 2, ns
);
3159 task
= next_tid(task
), ctx
->pos
++) {
3160 char name
[PROC_NUMBUF
];
3162 tid
= task_pid_nr_ns(task
, ns
);
3163 len
= snprintf(name
, sizeof(name
), "%d", tid
);
3164 if (!proc_fill_cache(file
, ctx
, name
, len
,
3165 proc_task_instantiate
, task
, NULL
)) {
3166 /* returning this tgid failed, save it as the first
3167 * pid for the next readir call */
3168 file
->f_version
= (u64
)tid
;
3169 put_task_struct(task
);
3177 static int proc_task_getattr(struct vfsmount
*mnt
, struct dentry
*dentry
, struct kstat
*stat
)
3179 struct inode
*inode
= dentry
->d_inode
;
3180 struct task_struct
*p
= get_proc_task(inode
);
3181 generic_fillattr(inode
, stat
);
3184 stat
->nlink
+= get_nr_threads(p
);
3191 static const struct inode_operations proc_task_inode_operations
= {
3192 .lookup
= proc_task_lookup
,
3193 .getattr
= proc_task_getattr
,
3194 .setattr
= proc_setattr
,
3195 .permission
= proc_pid_permission
,
3198 static const struct file_operations proc_task_operations
= {
3199 .read
= generic_read_dir
,
3200 .iterate
= proc_task_readdir
,
3201 .llseek
= default_llseek
,