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 seq_file
*m
, struct pid_namespace
*ns
,
209 struct pid
*pid
, struct task_struct
*task
)
211 struct mm_struct
*mm
= mm_access(task
, PTRACE_MODE_READ
);
212 if (mm
&& !IS_ERR(mm
)) {
213 unsigned int nwords
= 0;
216 } while (mm
->saved_auxv
[nwords
- 2] != 0); /* AT_NULL */
217 seq_write(m
, mm
->saved_auxv
, nwords
* sizeof(mm
->saved_auxv
[0]));
225 #ifdef CONFIG_KALLSYMS
227 * Provides a wchan file via kallsyms in a proper one-value-per-file format.
228 * Returns the resolved symbol. If that fails, simply return the address.
230 static int proc_pid_wchan(struct task_struct
*task
, char *buffer
)
233 char symname
[KSYM_NAME_LEN
];
235 wchan
= get_wchan(task
);
237 if (lookup_symbol_name(wchan
, symname
) < 0)
238 if (!ptrace_may_access(task
, PTRACE_MODE_READ
))
241 return sprintf(buffer
, "%lu", wchan
);
243 return sprintf(buffer
, "%s", symname
);
245 #endif /* CONFIG_KALLSYMS */
247 static int lock_trace(struct task_struct
*task
)
249 int err
= mutex_lock_killable(&task
->signal
->cred_guard_mutex
);
252 if (!ptrace_may_access(task
, PTRACE_MODE_ATTACH
)) {
253 mutex_unlock(&task
->signal
->cred_guard_mutex
);
259 static void unlock_trace(struct task_struct
*task
)
261 mutex_unlock(&task
->signal
->cred_guard_mutex
);
264 #ifdef CONFIG_STACKTRACE
266 #define MAX_STACK_TRACE_DEPTH 64
268 static int proc_pid_stack(struct seq_file
*m
, struct pid_namespace
*ns
,
269 struct pid
*pid
, struct task_struct
*task
)
271 struct stack_trace trace
;
272 unsigned long *entries
;
276 entries
= kmalloc(MAX_STACK_TRACE_DEPTH
* sizeof(*entries
), GFP_KERNEL
);
280 trace
.nr_entries
= 0;
281 trace
.max_entries
= MAX_STACK_TRACE_DEPTH
;
282 trace
.entries
= entries
;
285 err
= lock_trace(task
);
287 save_stack_trace_tsk(task
, &trace
);
289 for (i
= 0; i
< trace
.nr_entries
; i
++) {
290 seq_printf(m
, "[<%pK>] %pS\n",
291 (void *)entries
[i
], (void *)entries
[i
]);
301 #ifdef CONFIG_SCHEDSTATS
303 * Provides /proc/PID/schedstat
305 static int proc_pid_schedstat(struct task_struct
*task
, char *buffer
)
307 return sprintf(buffer
, "%llu %llu %lu\n",
308 (unsigned long long)task
->se
.sum_exec_runtime
,
309 (unsigned long long)task
->sched_info
.run_delay
,
310 task
->sched_info
.pcount
);
314 #ifdef CONFIG_LATENCYTOP
315 static int lstats_show_proc(struct seq_file
*m
, void *v
)
318 struct inode
*inode
= m
->private;
319 struct task_struct
*task
= get_proc_task(inode
);
323 seq_puts(m
, "Latency Top version : v0.1\n");
324 for (i
= 0; i
< 32; i
++) {
325 struct latency_record
*lr
= &task
->latency_record
[i
];
326 if (lr
->backtrace
[0]) {
328 seq_printf(m
, "%i %li %li",
329 lr
->count
, lr
->time
, lr
->max
);
330 for (q
= 0; q
< LT_BACKTRACEDEPTH
; q
++) {
331 unsigned long bt
= lr
->backtrace
[q
];
336 seq_printf(m
, " %ps", (void *)bt
);
342 put_task_struct(task
);
346 static int lstats_open(struct inode
*inode
, struct file
*file
)
348 return single_open(file
, lstats_show_proc
, inode
);
351 static ssize_t
lstats_write(struct file
*file
, const char __user
*buf
,
352 size_t count
, loff_t
*offs
)
354 struct task_struct
*task
= get_proc_task(file_inode(file
));
358 clear_all_latency_tracing(task
);
359 put_task_struct(task
);
364 static const struct file_operations proc_lstats_operations
= {
367 .write
= lstats_write
,
369 .release
= single_release
,
374 #ifdef CONFIG_CGROUPS
375 static int cgroup_open(struct inode
*inode
, struct file
*file
)
377 struct pid
*pid
= PROC_I(inode
)->pid
;
378 return single_open(file
, proc_cgroup_show
, pid
);
381 static const struct file_operations proc_cgroup_operations
= {
385 .release
= single_release
,
389 #ifdef CONFIG_PROC_PID_CPUSET
391 static int cpuset_open(struct inode
*inode
, struct file
*file
)
393 struct pid
*pid
= PROC_I(inode
)->pid
;
394 return single_open(file
, proc_cpuset_show
, pid
);
397 static const struct file_operations proc_cpuset_operations
= {
401 .release
= single_release
,
405 static int proc_oom_score(struct task_struct
*task
, char *buffer
)
407 unsigned long totalpages
= totalram_pages
+ total_swap_pages
;
408 unsigned long points
= 0;
410 read_lock(&tasklist_lock
);
412 points
= oom_badness(task
, NULL
, NULL
, totalpages
) *
414 read_unlock(&tasklist_lock
);
415 return sprintf(buffer
, "%lu\n", points
);
423 static const struct limit_names lnames
[RLIM_NLIMITS
] = {
424 [RLIMIT_CPU
] = {"Max cpu time", "seconds"},
425 [RLIMIT_FSIZE
] = {"Max file size", "bytes"},
426 [RLIMIT_DATA
] = {"Max data size", "bytes"},
427 [RLIMIT_STACK
] = {"Max stack size", "bytes"},
428 [RLIMIT_CORE
] = {"Max core file size", "bytes"},
429 [RLIMIT_RSS
] = {"Max resident set", "bytes"},
430 [RLIMIT_NPROC
] = {"Max processes", "processes"},
431 [RLIMIT_NOFILE
] = {"Max open files", "files"},
432 [RLIMIT_MEMLOCK
] = {"Max locked memory", "bytes"},
433 [RLIMIT_AS
] = {"Max address space", "bytes"},
434 [RLIMIT_LOCKS
] = {"Max file locks", "locks"},
435 [RLIMIT_SIGPENDING
] = {"Max pending signals", "signals"},
436 [RLIMIT_MSGQUEUE
] = {"Max msgqueue size", "bytes"},
437 [RLIMIT_NICE
] = {"Max nice priority", NULL
},
438 [RLIMIT_RTPRIO
] = {"Max realtime priority", NULL
},
439 [RLIMIT_RTTIME
] = {"Max realtime timeout", "us"},
442 /* Display limits for a process */
443 static int proc_pid_limits(struct seq_file
*m
, struct pid_namespace
*ns
,
444 struct pid
*pid
, struct task_struct
*task
)
449 struct rlimit rlim
[RLIM_NLIMITS
];
451 if (!lock_task_sighand(task
, &flags
))
453 memcpy(rlim
, task
->signal
->rlim
, sizeof(struct rlimit
) * RLIM_NLIMITS
);
454 unlock_task_sighand(task
, &flags
);
457 * print the file header
459 seq_printf(m
, "%-25s %-20s %-20s %-10s\n",
460 "Limit", "Soft Limit", "Hard Limit", "Units");
462 for (i
= 0; i
< RLIM_NLIMITS
; i
++) {
463 if (rlim
[i
].rlim_cur
== RLIM_INFINITY
)
464 seq_printf(m
, "%-25s %-20s ",
465 lnames
[i
].name
, "unlimited");
467 seq_printf(m
, "%-25s %-20lu ",
468 lnames
[i
].name
, rlim
[i
].rlim_cur
);
470 if (rlim
[i
].rlim_max
== RLIM_INFINITY
)
471 seq_printf(m
, "%-20s ", "unlimited");
473 seq_printf(m
, "%-20lu ", rlim
[i
].rlim_max
);
476 seq_printf(m
, "%-10s\n", lnames
[i
].unit
);
484 #ifdef CONFIG_HAVE_ARCH_TRACEHOOK
485 static int proc_pid_syscall(struct seq_file
*m
, struct pid_namespace
*ns
,
486 struct pid
*pid
, struct task_struct
*task
)
489 unsigned long args
[6], sp
, pc
;
490 int res
= lock_trace(task
);
494 if (task_current_syscall(task
, &nr
, args
, 6, &sp
, &pc
))
495 seq_puts(m
, "running\n");
497 seq_printf(m
, "%ld 0x%lx 0x%lx\n", nr
, sp
, pc
);
500 "%ld 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx\n",
502 args
[0], args
[1], args
[2], args
[3], args
[4], args
[5],
507 #endif /* CONFIG_HAVE_ARCH_TRACEHOOK */
509 /************************************************************************/
510 /* Here the fs part begins */
511 /************************************************************************/
513 /* permission checks */
514 static int proc_fd_access_allowed(struct inode
*inode
)
516 struct task_struct
*task
;
518 /* Allow access to a task's file descriptors if it is us or we
519 * may use ptrace attach to the process and find out that
522 task
= get_proc_task(inode
);
524 allowed
= ptrace_may_access(task
, PTRACE_MODE_READ
);
525 put_task_struct(task
);
530 int proc_setattr(struct dentry
*dentry
, struct iattr
*attr
)
533 struct inode
*inode
= dentry
->d_inode
;
535 if (attr
->ia_valid
& ATTR_MODE
)
538 error
= inode_change_ok(inode
, attr
);
542 setattr_copy(inode
, attr
);
543 mark_inode_dirty(inode
);
548 * May current process learn task's sched/cmdline info (for hide_pid_min=1)
549 * or euid/egid (for hide_pid_min=2)?
551 static bool has_pid_permissions(struct pid_namespace
*pid
,
552 struct task_struct
*task
,
555 if (pid
->hide_pid
< hide_pid_min
)
557 if (in_group_p(pid
->pid_gid
))
559 return ptrace_may_access(task
, PTRACE_MODE_READ
);
563 static int proc_pid_permission(struct inode
*inode
, int mask
)
565 struct pid_namespace
*pid
= inode
->i_sb
->s_fs_info
;
566 struct task_struct
*task
;
569 task
= get_proc_task(inode
);
572 has_perms
= has_pid_permissions(pid
, task
, 1);
573 put_task_struct(task
);
576 if (pid
->hide_pid
== 2) {
578 * Let's make getdents(), stat(), and open()
579 * consistent with each other. If a process
580 * may not stat() a file, it shouldn't be seen
588 return generic_permission(inode
, mask
);
593 static const struct inode_operations proc_def_inode_operations
= {
594 .setattr
= proc_setattr
,
597 #define PROC_BLOCK_SIZE (3*1024) /* 4K page size but our output routines use some slack for overruns */
599 static ssize_t
proc_info_read(struct file
* file
, char __user
* buf
,
600 size_t count
, loff_t
*ppos
)
602 struct inode
* inode
= file_inode(file
);
605 struct task_struct
*task
= get_proc_task(inode
);
611 if (count
> PROC_BLOCK_SIZE
)
612 count
= PROC_BLOCK_SIZE
;
615 if (!(page
= __get_free_page(GFP_TEMPORARY
)))
618 length
= PROC_I(inode
)->op
.proc_read(task
, (char*)page
);
621 length
= simple_read_from_buffer(buf
, count
, ppos
, (char *)page
, length
);
624 put_task_struct(task
);
629 static const struct file_operations proc_info_file_operations
= {
630 .read
= proc_info_read
,
631 .llseek
= generic_file_llseek
,
634 static int proc_single_show(struct seq_file
*m
, void *v
)
636 struct inode
*inode
= m
->private;
637 struct pid_namespace
*ns
;
639 struct task_struct
*task
;
642 ns
= inode
->i_sb
->s_fs_info
;
643 pid
= proc_pid(inode
);
644 task
= get_pid_task(pid
, PIDTYPE_PID
);
648 ret
= PROC_I(inode
)->op
.proc_show(m
, ns
, pid
, task
);
650 put_task_struct(task
);
654 static int proc_single_open(struct inode
*inode
, struct file
*filp
)
656 return single_open(filp
, proc_single_show
, inode
);
659 static const struct file_operations proc_single_file_operations
= {
660 .open
= proc_single_open
,
663 .release
= single_release
,
666 static int __mem_open(struct inode
*inode
, struct file
*file
, unsigned int mode
)
668 struct task_struct
*task
= get_proc_task(file_inode(file
));
669 struct mm_struct
*mm
;
674 mm
= mm_access(task
, mode
);
675 put_task_struct(task
);
681 /* ensure this mm_struct can't be freed */
682 atomic_inc(&mm
->mm_count
);
683 /* but do not pin its memory */
687 file
->private_data
= mm
;
692 static int mem_open(struct inode
*inode
, struct file
*file
)
694 int ret
= __mem_open(inode
, file
, PTRACE_MODE_ATTACH
);
696 /* OK to pass negative loff_t, we can catch out-of-range */
697 file
->f_mode
|= FMODE_UNSIGNED_OFFSET
;
702 static ssize_t
mem_rw(struct file
*file
, char __user
*buf
,
703 size_t count
, loff_t
*ppos
, int write
)
705 struct mm_struct
*mm
= file
->private_data
;
706 unsigned long addr
= *ppos
;
713 page
= (char *)__get_free_page(GFP_TEMPORARY
);
718 if (!atomic_inc_not_zero(&mm
->mm_users
))
722 int this_len
= min_t(int, count
, PAGE_SIZE
);
724 if (write
&& copy_from_user(page
, buf
, this_len
)) {
729 this_len
= access_remote_vm(mm
, addr
, page
, this_len
, write
);
736 if (!write
&& copy_to_user(buf
, page
, this_len
)) {
750 free_page((unsigned long) page
);
754 static ssize_t
mem_read(struct file
*file
, char __user
*buf
,
755 size_t count
, loff_t
*ppos
)
757 return mem_rw(file
, buf
, count
, ppos
, 0);
760 static ssize_t
mem_write(struct file
*file
, const char __user
*buf
,
761 size_t count
, loff_t
*ppos
)
763 return mem_rw(file
, (char __user
*)buf
, count
, ppos
, 1);
766 loff_t
mem_lseek(struct file
*file
, loff_t offset
, int orig
)
770 file
->f_pos
= offset
;
773 file
->f_pos
+= offset
;
778 force_successful_syscall_return();
782 static int mem_release(struct inode
*inode
, struct file
*file
)
784 struct mm_struct
*mm
= file
->private_data
;
790 static const struct file_operations proc_mem_operations
= {
795 .release
= mem_release
,
798 static int environ_open(struct inode
*inode
, struct file
*file
)
800 return __mem_open(inode
, file
, PTRACE_MODE_READ
);
803 static ssize_t
environ_read(struct file
*file
, char __user
*buf
,
804 size_t count
, loff_t
*ppos
)
807 unsigned long src
= *ppos
;
809 struct mm_struct
*mm
= file
->private_data
;
814 page
= (char *)__get_free_page(GFP_TEMPORARY
);
819 if (!atomic_inc_not_zero(&mm
->mm_users
))
822 size_t this_len
, max_len
;
825 if (src
>= (mm
->env_end
- mm
->env_start
))
828 this_len
= mm
->env_end
- (mm
->env_start
+ src
);
830 max_len
= min_t(size_t, PAGE_SIZE
, count
);
831 this_len
= min(max_len
, this_len
);
833 retval
= access_remote_vm(mm
, (mm
->env_start
+ src
),
841 if (copy_to_user(buf
, page
, retval
)) {
855 free_page((unsigned long) page
);
859 static const struct file_operations proc_environ_operations
= {
860 .open
= environ_open
,
861 .read
= environ_read
,
862 .llseek
= generic_file_llseek
,
863 .release
= mem_release
,
866 static ssize_t
oom_adj_read(struct file
*file
, char __user
*buf
, size_t count
,
869 struct task_struct
*task
= get_proc_task(file_inode(file
));
870 char buffer
[PROC_NUMBUF
];
871 int oom_adj
= OOM_ADJUST_MIN
;
877 if (lock_task_sighand(task
, &flags
)) {
878 if (task
->signal
->oom_score_adj
== OOM_SCORE_ADJ_MAX
)
879 oom_adj
= OOM_ADJUST_MAX
;
881 oom_adj
= (task
->signal
->oom_score_adj
* -OOM_DISABLE
) /
883 unlock_task_sighand(task
, &flags
);
885 put_task_struct(task
);
886 len
= snprintf(buffer
, sizeof(buffer
), "%d\n", oom_adj
);
887 return simple_read_from_buffer(buf
, count
, ppos
, buffer
, len
);
890 static ssize_t
oom_adj_write(struct file
*file
, const char __user
*buf
,
891 size_t count
, loff_t
*ppos
)
893 struct task_struct
*task
;
894 char buffer
[PROC_NUMBUF
];
899 memset(buffer
, 0, sizeof(buffer
));
900 if (count
> sizeof(buffer
) - 1)
901 count
= sizeof(buffer
) - 1;
902 if (copy_from_user(buffer
, buf
, count
)) {
907 err
= kstrtoint(strstrip(buffer
), 0, &oom_adj
);
910 if ((oom_adj
< OOM_ADJUST_MIN
|| oom_adj
> OOM_ADJUST_MAX
) &&
911 oom_adj
!= OOM_DISABLE
) {
916 task
= get_proc_task(file_inode(file
));
928 if (!lock_task_sighand(task
, &flags
)) {
934 * Scale /proc/pid/oom_score_adj appropriately ensuring that a maximum
935 * value is always attainable.
937 if (oom_adj
== OOM_ADJUST_MAX
)
938 oom_adj
= OOM_SCORE_ADJ_MAX
;
940 oom_adj
= (oom_adj
* OOM_SCORE_ADJ_MAX
) / -OOM_DISABLE
;
942 if (oom_adj
< task
->signal
->oom_score_adj
&&
943 !capable(CAP_SYS_RESOURCE
)) {
949 * /proc/pid/oom_adj is provided for legacy purposes, ask users to use
950 * /proc/pid/oom_score_adj instead.
952 pr_warn_once("%s (%d): /proc/%d/oom_adj is deprecated, please use /proc/%d/oom_score_adj instead.\n",
953 current
->comm
, task_pid_nr(current
), task_pid_nr(task
),
956 task
->signal
->oom_score_adj
= oom_adj
;
957 trace_oom_score_adj_update(task
);
959 unlock_task_sighand(task
, &flags
);
962 put_task_struct(task
);
964 return err
< 0 ? err
: count
;
967 static const struct file_operations proc_oom_adj_operations
= {
968 .read
= oom_adj_read
,
969 .write
= oom_adj_write
,
970 .llseek
= generic_file_llseek
,
973 static ssize_t
oom_score_adj_read(struct file
*file
, char __user
*buf
,
974 size_t count
, loff_t
*ppos
)
976 struct task_struct
*task
= get_proc_task(file_inode(file
));
977 char buffer
[PROC_NUMBUF
];
978 short oom_score_adj
= OOM_SCORE_ADJ_MIN
;
984 if (lock_task_sighand(task
, &flags
)) {
985 oom_score_adj
= task
->signal
->oom_score_adj
;
986 unlock_task_sighand(task
, &flags
);
988 put_task_struct(task
);
989 len
= snprintf(buffer
, sizeof(buffer
), "%hd\n", oom_score_adj
);
990 return simple_read_from_buffer(buf
, count
, ppos
, buffer
, len
);
993 static ssize_t
oom_score_adj_write(struct file
*file
, const char __user
*buf
,
994 size_t count
, loff_t
*ppos
)
996 struct task_struct
*task
;
997 char buffer
[PROC_NUMBUF
];
1002 memset(buffer
, 0, sizeof(buffer
));
1003 if (count
> sizeof(buffer
) - 1)
1004 count
= sizeof(buffer
) - 1;
1005 if (copy_from_user(buffer
, buf
, count
)) {
1010 err
= kstrtoint(strstrip(buffer
), 0, &oom_score_adj
);
1013 if (oom_score_adj
< OOM_SCORE_ADJ_MIN
||
1014 oom_score_adj
> OOM_SCORE_ADJ_MAX
) {
1019 task
= get_proc_task(file_inode(file
));
1031 if (!lock_task_sighand(task
, &flags
)) {
1036 if ((short)oom_score_adj
< task
->signal
->oom_score_adj_min
&&
1037 !capable(CAP_SYS_RESOURCE
)) {
1042 task
->signal
->oom_score_adj
= (short)oom_score_adj
;
1043 if (has_capability_noaudit(current
, CAP_SYS_RESOURCE
))
1044 task
->signal
->oom_score_adj_min
= (short)oom_score_adj
;
1045 trace_oom_score_adj_update(task
);
1048 unlock_task_sighand(task
, &flags
);
1051 put_task_struct(task
);
1053 return err
< 0 ? err
: count
;
1056 static const struct file_operations proc_oom_score_adj_operations
= {
1057 .read
= oom_score_adj_read
,
1058 .write
= oom_score_adj_write
,
1059 .llseek
= default_llseek
,
1062 #ifdef CONFIG_AUDITSYSCALL
1063 #define TMPBUFLEN 21
1064 static ssize_t
proc_loginuid_read(struct file
* file
, char __user
* buf
,
1065 size_t count
, loff_t
*ppos
)
1067 struct inode
* inode
= file_inode(file
);
1068 struct task_struct
*task
= get_proc_task(inode
);
1070 char tmpbuf
[TMPBUFLEN
];
1074 length
= scnprintf(tmpbuf
, TMPBUFLEN
, "%u",
1075 from_kuid(file
->f_cred
->user_ns
,
1076 audit_get_loginuid(task
)));
1077 put_task_struct(task
);
1078 return simple_read_from_buffer(buf
, count
, ppos
, tmpbuf
, length
);
1081 static ssize_t
proc_loginuid_write(struct file
* file
, const char __user
* buf
,
1082 size_t count
, loff_t
*ppos
)
1084 struct inode
* inode
= file_inode(file
);
1091 if (current
!= pid_task(proc_pid(inode
), PIDTYPE_PID
)) {
1097 if (count
>= PAGE_SIZE
)
1098 count
= PAGE_SIZE
- 1;
1101 /* No partial writes. */
1104 page
= (char*)__get_free_page(GFP_TEMPORARY
);
1108 if (copy_from_user(page
, buf
, count
))
1112 loginuid
= simple_strtoul(page
, &tmp
, 10);
1119 /* is userspace tring to explicitly UNSET the loginuid? */
1120 if (loginuid
== AUDIT_UID_UNSET
) {
1121 kloginuid
= INVALID_UID
;
1123 kloginuid
= make_kuid(file
->f_cred
->user_ns
, loginuid
);
1124 if (!uid_valid(kloginuid
)) {
1130 length
= audit_set_loginuid(kloginuid
);
1131 if (likely(length
== 0))
1135 free_page((unsigned long) page
);
1139 static const struct file_operations proc_loginuid_operations
= {
1140 .read
= proc_loginuid_read
,
1141 .write
= proc_loginuid_write
,
1142 .llseek
= generic_file_llseek
,
1145 static ssize_t
proc_sessionid_read(struct file
* file
, char __user
* buf
,
1146 size_t count
, loff_t
*ppos
)
1148 struct inode
* inode
= file_inode(file
);
1149 struct task_struct
*task
= get_proc_task(inode
);
1151 char tmpbuf
[TMPBUFLEN
];
1155 length
= scnprintf(tmpbuf
, TMPBUFLEN
, "%u",
1156 audit_get_sessionid(task
));
1157 put_task_struct(task
);
1158 return simple_read_from_buffer(buf
, count
, ppos
, tmpbuf
, length
);
1161 static const struct file_operations proc_sessionid_operations
= {
1162 .read
= proc_sessionid_read
,
1163 .llseek
= generic_file_llseek
,
1167 #ifdef CONFIG_FAULT_INJECTION
1168 static ssize_t
proc_fault_inject_read(struct file
* file
, char __user
* buf
,
1169 size_t count
, loff_t
*ppos
)
1171 struct task_struct
*task
= get_proc_task(file_inode(file
));
1172 char buffer
[PROC_NUMBUF
];
1178 make_it_fail
= task
->make_it_fail
;
1179 put_task_struct(task
);
1181 len
= snprintf(buffer
, sizeof(buffer
), "%i\n", make_it_fail
);
1183 return simple_read_from_buffer(buf
, count
, ppos
, buffer
, len
);
1186 static ssize_t
proc_fault_inject_write(struct file
* file
,
1187 const char __user
* buf
, size_t count
, loff_t
*ppos
)
1189 struct task_struct
*task
;
1190 char buffer
[PROC_NUMBUF
], *end
;
1193 if (!capable(CAP_SYS_RESOURCE
))
1195 memset(buffer
, 0, sizeof(buffer
));
1196 if (count
> sizeof(buffer
) - 1)
1197 count
= sizeof(buffer
) - 1;
1198 if (copy_from_user(buffer
, buf
, count
))
1200 make_it_fail
= simple_strtol(strstrip(buffer
), &end
, 0);
1203 if (make_it_fail
< 0 || make_it_fail
> 1)
1206 task
= get_proc_task(file_inode(file
));
1209 task
->make_it_fail
= make_it_fail
;
1210 put_task_struct(task
);
1215 static const struct file_operations proc_fault_inject_operations
= {
1216 .read
= proc_fault_inject_read
,
1217 .write
= proc_fault_inject_write
,
1218 .llseek
= generic_file_llseek
,
1223 #ifdef CONFIG_SCHED_DEBUG
1225 * Print out various scheduling related per-task fields:
1227 static int sched_show(struct seq_file
*m
, void *v
)
1229 struct inode
*inode
= m
->private;
1230 struct task_struct
*p
;
1232 p
= get_proc_task(inode
);
1235 proc_sched_show_task(p
, m
);
1243 sched_write(struct file
*file
, const char __user
*buf
,
1244 size_t count
, loff_t
*offset
)
1246 struct inode
*inode
= file_inode(file
);
1247 struct task_struct
*p
;
1249 p
= get_proc_task(inode
);
1252 proc_sched_set_task(p
);
1259 static int sched_open(struct inode
*inode
, struct file
*filp
)
1261 return single_open(filp
, sched_show
, inode
);
1264 static const struct file_operations proc_pid_sched_operations
= {
1267 .write
= sched_write
,
1268 .llseek
= seq_lseek
,
1269 .release
= single_release
,
1274 #ifdef CONFIG_SCHED_AUTOGROUP
1276 * Print out autogroup related information:
1278 static int sched_autogroup_show(struct seq_file
*m
, void *v
)
1280 struct inode
*inode
= m
->private;
1281 struct task_struct
*p
;
1283 p
= get_proc_task(inode
);
1286 proc_sched_autogroup_show_task(p
, m
);
1294 sched_autogroup_write(struct file
*file
, const char __user
*buf
,
1295 size_t count
, loff_t
*offset
)
1297 struct inode
*inode
= file_inode(file
);
1298 struct task_struct
*p
;
1299 char buffer
[PROC_NUMBUF
];
1303 memset(buffer
, 0, sizeof(buffer
));
1304 if (count
> sizeof(buffer
) - 1)
1305 count
= sizeof(buffer
) - 1;
1306 if (copy_from_user(buffer
, buf
, count
))
1309 err
= kstrtoint(strstrip(buffer
), 0, &nice
);
1313 p
= get_proc_task(inode
);
1317 err
= proc_sched_autogroup_set_nice(p
, nice
);
1326 static int sched_autogroup_open(struct inode
*inode
, struct file
*filp
)
1330 ret
= single_open(filp
, sched_autogroup_show
, NULL
);
1332 struct seq_file
*m
= filp
->private_data
;
1339 static const struct file_operations proc_pid_sched_autogroup_operations
= {
1340 .open
= sched_autogroup_open
,
1342 .write
= sched_autogroup_write
,
1343 .llseek
= seq_lseek
,
1344 .release
= single_release
,
1347 #endif /* CONFIG_SCHED_AUTOGROUP */
1349 static ssize_t
comm_write(struct file
*file
, const char __user
*buf
,
1350 size_t count
, loff_t
*offset
)
1352 struct inode
*inode
= file_inode(file
);
1353 struct task_struct
*p
;
1354 char buffer
[TASK_COMM_LEN
];
1355 const size_t maxlen
= sizeof(buffer
) - 1;
1357 memset(buffer
, 0, sizeof(buffer
));
1358 if (copy_from_user(buffer
, buf
, count
> maxlen
? maxlen
: count
))
1361 p
= get_proc_task(inode
);
1365 if (same_thread_group(current
, p
))
1366 set_task_comm(p
, buffer
);
1375 static int comm_show(struct seq_file
*m
, void *v
)
1377 struct inode
*inode
= m
->private;
1378 struct task_struct
*p
;
1380 p
= get_proc_task(inode
);
1385 seq_printf(m
, "%s\n", p
->comm
);
1393 static int comm_open(struct inode
*inode
, struct file
*filp
)
1395 return single_open(filp
, comm_show
, inode
);
1398 static const struct file_operations proc_pid_set_comm_operations
= {
1401 .write
= comm_write
,
1402 .llseek
= seq_lseek
,
1403 .release
= single_release
,
1406 static int proc_exe_link(struct dentry
*dentry
, struct path
*exe_path
)
1408 struct task_struct
*task
;
1409 struct mm_struct
*mm
;
1410 struct file
*exe_file
;
1412 task
= get_proc_task(dentry
->d_inode
);
1415 mm
= get_task_mm(task
);
1416 put_task_struct(task
);
1419 exe_file
= get_mm_exe_file(mm
);
1422 *exe_path
= exe_file
->f_path
;
1423 path_get(&exe_file
->f_path
);
1430 static void *proc_pid_follow_link(struct dentry
*dentry
, struct nameidata
*nd
)
1432 struct inode
*inode
= dentry
->d_inode
;
1434 int error
= -EACCES
;
1436 /* Are we allowed to snoop on the tasks file descriptors? */
1437 if (!proc_fd_access_allowed(inode
))
1440 error
= PROC_I(inode
)->op
.proc_get_link(dentry
, &path
);
1444 nd_jump_link(nd
, &path
);
1447 return ERR_PTR(error
);
1450 static int do_proc_readlink(struct path
*path
, char __user
*buffer
, int buflen
)
1452 char *tmp
= (char*)__get_free_page(GFP_TEMPORARY
);
1459 pathname
= d_path(path
, tmp
, PAGE_SIZE
);
1460 len
= PTR_ERR(pathname
);
1461 if (IS_ERR(pathname
))
1463 len
= tmp
+ PAGE_SIZE
- 1 - pathname
;
1467 if (copy_to_user(buffer
, pathname
, len
))
1470 free_page((unsigned long)tmp
);
1474 static int proc_pid_readlink(struct dentry
* dentry
, char __user
* buffer
, int buflen
)
1476 int error
= -EACCES
;
1477 struct inode
*inode
= dentry
->d_inode
;
1480 /* Are we allowed to snoop on the tasks file descriptors? */
1481 if (!proc_fd_access_allowed(inode
))
1484 error
= PROC_I(inode
)->op
.proc_get_link(dentry
, &path
);
1488 error
= do_proc_readlink(&path
, buffer
, buflen
);
1494 const struct inode_operations proc_pid_link_inode_operations
= {
1495 .readlink
= proc_pid_readlink
,
1496 .follow_link
= proc_pid_follow_link
,
1497 .setattr
= proc_setattr
,
1501 /* building an inode */
1503 struct inode
*proc_pid_make_inode(struct super_block
* sb
, struct task_struct
*task
)
1505 struct inode
* inode
;
1506 struct proc_inode
*ei
;
1507 const struct cred
*cred
;
1509 /* We need a new inode */
1511 inode
= new_inode(sb
);
1517 inode
->i_ino
= get_next_ino();
1518 inode
->i_mtime
= inode
->i_atime
= inode
->i_ctime
= CURRENT_TIME
;
1519 inode
->i_op
= &proc_def_inode_operations
;
1522 * grab the reference to task.
1524 ei
->pid
= get_task_pid(task
, PIDTYPE_PID
);
1528 if (task_dumpable(task
)) {
1530 cred
= __task_cred(task
);
1531 inode
->i_uid
= cred
->euid
;
1532 inode
->i_gid
= cred
->egid
;
1535 security_task_to_inode(task
, inode
);
1545 int pid_getattr(struct vfsmount
*mnt
, struct dentry
*dentry
, struct kstat
*stat
)
1547 struct inode
*inode
= dentry
->d_inode
;
1548 struct task_struct
*task
;
1549 const struct cred
*cred
;
1550 struct pid_namespace
*pid
= dentry
->d_sb
->s_fs_info
;
1552 generic_fillattr(inode
, stat
);
1555 stat
->uid
= GLOBAL_ROOT_UID
;
1556 stat
->gid
= GLOBAL_ROOT_GID
;
1557 task
= pid_task(proc_pid(inode
), PIDTYPE_PID
);
1559 if (!has_pid_permissions(pid
, task
, 2)) {
1562 * This doesn't prevent learning whether PID exists,
1563 * it only makes getattr() consistent with readdir().
1567 if ((inode
->i_mode
== (S_IFDIR
|S_IRUGO
|S_IXUGO
)) ||
1568 task_dumpable(task
)) {
1569 cred
= __task_cred(task
);
1570 stat
->uid
= cred
->euid
;
1571 stat
->gid
= cred
->egid
;
1581 * Exceptional case: normally we are not allowed to unhash a busy
1582 * directory. In this case, however, we can do it - no aliasing problems
1583 * due to the way we treat inodes.
1585 * Rewrite the inode's ownerships here because the owning task may have
1586 * performed a setuid(), etc.
1588 * Before the /proc/pid/status file was created the only way to read
1589 * the effective uid of a /process was to stat /proc/pid. Reading
1590 * /proc/pid/status is slow enough that procps and other packages
1591 * kept stating /proc/pid. To keep the rules in /proc simple I have
1592 * made this apply to all per process world readable and executable
1595 int pid_revalidate(struct dentry
*dentry
, unsigned int flags
)
1597 struct inode
*inode
;
1598 struct task_struct
*task
;
1599 const struct cred
*cred
;
1601 if (flags
& LOOKUP_RCU
)
1604 inode
= dentry
->d_inode
;
1605 task
= get_proc_task(inode
);
1608 if ((inode
->i_mode
== (S_IFDIR
|S_IRUGO
|S_IXUGO
)) ||
1609 task_dumpable(task
)) {
1611 cred
= __task_cred(task
);
1612 inode
->i_uid
= cred
->euid
;
1613 inode
->i_gid
= cred
->egid
;
1616 inode
->i_uid
= GLOBAL_ROOT_UID
;
1617 inode
->i_gid
= GLOBAL_ROOT_GID
;
1619 inode
->i_mode
&= ~(S_ISUID
| S_ISGID
);
1620 security_task_to_inode(task
, inode
);
1621 put_task_struct(task
);
1628 static inline bool proc_inode_is_dead(struct inode
*inode
)
1630 return !proc_pid(inode
)->tasks
[PIDTYPE_PID
].first
;
1633 int pid_delete_dentry(const struct dentry
*dentry
)
1635 /* Is the task we represent dead?
1636 * If so, then don't put the dentry on the lru list,
1637 * kill it immediately.
1639 return proc_inode_is_dead(dentry
->d_inode
);
1642 const struct dentry_operations pid_dentry_operations
=
1644 .d_revalidate
= pid_revalidate
,
1645 .d_delete
= pid_delete_dentry
,
1651 * Fill a directory entry.
1653 * If possible create the dcache entry and derive our inode number and
1654 * file type from dcache entry.
1656 * Since all of the proc inode numbers are dynamically generated, the inode
1657 * numbers do not exist until the inode is cache. This means creating the
1658 * the dcache entry in readdir is necessary to keep the inode numbers
1659 * reported by readdir in sync with the inode numbers reported
1662 bool proc_fill_cache(struct file
*file
, struct dir_context
*ctx
,
1663 const char *name
, int len
,
1664 instantiate_t instantiate
, struct task_struct
*task
, const void *ptr
)
1666 struct dentry
*child
, *dir
= file
->f_path
.dentry
;
1667 struct qstr qname
= QSTR_INIT(name
, len
);
1668 struct inode
*inode
;
1672 child
= d_hash_and_lookup(dir
, &qname
);
1674 child
= d_alloc(dir
, &qname
);
1676 goto end_instantiate
;
1677 if (instantiate(dir
->d_inode
, child
, task
, ptr
) < 0) {
1679 goto end_instantiate
;
1682 inode
= child
->d_inode
;
1684 type
= inode
->i_mode
>> 12;
1686 return dir_emit(ctx
, name
, len
, ino
, type
);
1689 return dir_emit(ctx
, name
, len
, 1, DT_UNKNOWN
);
1692 #ifdef CONFIG_CHECKPOINT_RESTORE
1695 * dname_to_vma_addr - maps a dentry name into two unsigned longs
1696 * which represent vma start and end addresses.
1698 static int dname_to_vma_addr(struct dentry
*dentry
,
1699 unsigned long *start
, unsigned long *end
)
1701 if (sscanf(dentry
->d_name
.name
, "%lx-%lx", start
, end
) != 2)
1707 static int map_files_d_revalidate(struct dentry
*dentry
, unsigned int flags
)
1709 unsigned long vm_start
, vm_end
;
1710 bool exact_vma_exists
= false;
1711 struct mm_struct
*mm
= NULL
;
1712 struct task_struct
*task
;
1713 const struct cred
*cred
;
1714 struct inode
*inode
;
1717 if (flags
& LOOKUP_RCU
)
1720 if (!capable(CAP_SYS_ADMIN
)) {
1725 inode
= dentry
->d_inode
;
1726 task
= get_proc_task(inode
);
1730 mm
= mm_access(task
, PTRACE_MODE_READ
);
1731 if (IS_ERR_OR_NULL(mm
))
1734 if (!dname_to_vma_addr(dentry
, &vm_start
, &vm_end
)) {
1735 down_read(&mm
->mmap_sem
);
1736 exact_vma_exists
= !!find_exact_vma(mm
, vm_start
, vm_end
);
1737 up_read(&mm
->mmap_sem
);
1742 if (exact_vma_exists
) {
1743 if (task_dumpable(task
)) {
1745 cred
= __task_cred(task
);
1746 inode
->i_uid
= cred
->euid
;
1747 inode
->i_gid
= cred
->egid
;
1750 inode
->i_uid
= GLOBAL_ROOT_UID
;
1751 inode
->i_gid
= GLOBAL_ROOT_GID
;
1753 security_task_to_inode(task
, inode
);
1758 put_task_struct(task
);
1767 static const struct dentry_operations tid_map_files_dentry_operations
= {
1768 .d_revalidate
= map_files_d_revalidate
,
1769 .d_delete
= pid_delete_dentry
,
1772 static int proc_map_files_get_link(struct dentry
*dentry
, struct path
*path
)
1774 unsigned long vm_start
, vm_end
;
1775 struct vm_area_struct
*vma
;
1776 struct task_struct
*task
;
1777 struct mm_struct
*mm
;
1781 task
= get_proc_task(dentry
->d_inode
);
1785 mm
= get_task_mm(task
);
1786 put_task_struct(task
);
1790 rc
= dname_to_vma_addr(dentry
, &vm_start
, &vm_end
);
1795 down_read(&mm
->mmap_sem
);
1796 vma
= find_exact_vma(mm
, vm_start
, vm_end
);
1797 if (vma
&& vma
->vm_file
) {
1798 *path
= vma
->vm_file
->f_path
;
1802 up_read(&mm
->mmap_sem
);
1810 struct map_files_info
{
1813 unsigned char name
[4*sizeof(long)+2]; /* max: %lx-%lx\0 */
1817 proc_map_files_instantiate(struct inode
*dir
, struct dentry
*dentry
,
1818 struct task_struct
*task
, const void *ptr
)
1820 fmode_t mode
= (fmode_t
)(unsigned long)ptr
;
1821 struct proc_inode
*ei
;
1822 struct inode
*inode
;
1824 inode
= proc_pid_make_inode(dir
->i_sb
, task
);
1829 ei
->op
.proc_get_link
= proc_map_files_get_link
;
1831 inode
->i_op
= &proc_pid_link_inode_operations
;
1833 inode
->i_mode
= S_IFLNK
;
1835 if (mode
& FMODE_READ
)
1836 inode
->i_mode
|= S_IRUSR
;
1837 if (mode
& FMODE_WRITE
)
1838 inode
->i_mode
|= S_IWUSR
;
1840 d_set_d_op(dentry
, &tid_map_files_dentry_operations
);
1841 d_add(dentry
, inode
);
1846 static struct dentry
*proc_map_files_lookup(struct inode
*dir
,
1847 struct dentry
*dentry
, unsigned int flags
)
1849 unsigned long vm_start
, vm_end
;
1850 struct vm_area_struct
*vma
;
1851 struct task_struct
*task
;
1853 struct mm_struct
*mm
;
1856 if (!capable(CAP_SYS_ADMIN
))
1860 task
= get_proc_task(dir
);
1865 if (!ptrace_may_access(task
, PTRACE_MODE_READ
))
1869 if (dname_to_vma_addr(dentry
, &vm_start
, &vm_end
))
1872 mm
= get_task_mm(task
);
1876 down_read(&mm
->mmap_sem
);
1877 vma
= find_exact_vma(mm
, vm_start
, vm_end
);
1882 result
= proc_map_files_instantiate(dir
, dentry
, task
,
1883 (void *)(unsigned long)vma
->vm_file
->f_mode
);
1886 up_read(&mm
->mmap_sem
);
1889 put_task_struct(task
);
1891 return ERR_PTR(result
);
1894 static const struct inode_operations proc_map_files_inode_operations
= {
1895 .lookup
= proc_map_files_lookup
,
1896 .permission
= proc_fd_permission
,
1897 .setattr
= proc_setattr
,
1901 proc_map_files_readdir(struct file
*file
, struct dir_context
*ctx
)
1903 struct vm_area_struct
*vma
;
1904 struct task_struct
*task
;
1905 struct mm_struct
*mm
;
1906 unsigned long nr_files
, pos
, i
;
1907 struct flex_array
*fa
= NULL
;
1908 struct map_files_info info
;
1909 struct map_files_info
*p
;
1913 if (!capable(CAP_SYS_ADMIN
))
1917 task
= get_proc_task(file_inode(file
));
1922 if (!ptrace_may_access(task
, PTRACE_MODE_READ
))
1926 if (!dir_emit_dots(file
, ctx
))
1929 mm
= get_task_mm(task
);
1932 down_read(&mm
->mmap_sem
);
1937 * We need two passes here:
1939 * 1) Collect vmas of mapped files with mmap_sem taken
1940 * 2) Release mmap_sem and instantiate entries
1942 * otherwise we get lockdep complained, since filldir()
1943 * routine might require mmap_sem taken in might_fault().
1946 for (vma
= mm
->mmap
, pos
= 2; vma
; vma
= vma
->vm_next
) {
1947 if (vma
->vm_file
&& ++pos
> ctx
->pos
)
1952 fa
= flex_array_alloc(sizeof(info
), nr_files
,
1954 if (!fa
|| flex_array_prealloc(fa
, 0, nr_files
,
1958 flex_array_free(fa
);
1959 up_read(&mm
->mmap_sem
);
1963 for (i
= 0, vma
= mm
->mmap
, pos
= 2; vma
;
1964 vma
= vma
->vm_next
) {
1967 if (++pos
<= ctx
->pos
)
1970 info
.mode
= vma
->vm_file
->f_mode
;
1971 info
.len
= snprintf(info
.name
,
1972 sizeof(info
.name
), "%lx-%lx",
1973 vma
->vm_start
, vma
->vm_end
);
1974 if (flex_array_put(fa
, i
++, &info
, GFP_KERNEL
))
1978 up_read(&mm
->mmap_sem
);
1980 for (i
= 0; i
< nr_files
; i
++) {
1981 p
= flex_array_get(fa
, i
);
1982 if (!proc_fill_cache(file
, ctx
,
1984 proc_map_files_instantiate
,
1986 (void *)(unsigned long)p
->mode
))
1991 flex_array_free(fa
);
1995 put_task_struct(task
);
2000 static const struct file_operations proc_map_files_operations
= {
2001 .read
= generic_read_dir
,
2002 .iterate
= proc_map_files_readdir
,
2003 .llseek
= default_llseek
,
2006 struct timers_private
{
2008 struct task_struct
*task
;
2009 struct sighand_struct
*sighand
;
2010 struct pid_namespace
*ns
;
2011 unsigned long flags
;
2014 static void *timers_start(struct seq_file
*m
, loff_t
*pos
)
2016 struct timers_private
*tp
= m
->private;
2018 tp
->task
= get_pid_task(tp
->pid
, PIDTYPE_PID
);
2020 return ERR_PTR(-ESRCH
);
2022 tp
->sighand
= lock_task_sighand(tp
->task
, &tp
->flags
);
2024 return ERR_PTR(-ESRCH
);
2026 return seq_list_start(&tp
->task
->signal
->posix_timers
, *pos
);
2029 static void *timers_next(struct seq_file
*m
, void *v
, loff_t
*pos
)
2031 struct timers_private
*tp
= m
->private;
2032 return seq_list_next(v
, &tp
->task
->signal
->posix_timers
, pos
);
2035 static void timers_stop(struct seq_file
*m
, void *v
)
2037 struct timers_private
*tp
= m
->private;
2040 unlock_task_sighand(tp
->task
, &tp
->flags
);
2045 put_task_struct(tp
->task
);
2050 static int show_timer(struct seq_file
*m
, void *v
)
2052 struct k_itimer
*timer
;
2053 struct timers_private
*tp
= m
->private;
2055 static const char * const nstr
[] = {
2056 [SIGEV_SIGNAL
] = "signal",
2057 [SIGEV_NONE
] = "none",
2058 [SIGEV_THREAD
] = "thread",
2061 timer
= list_entry((struct list_head
*)v
, struct k_itimer
, list
);
2062 notify
= timer
->it_sigev_notify
;
2064 seq_printf(m
, "ID: %d\n", timer
->it_id
);
2065 seq_printf(m
, "signal: %d/%p\n", timer
->sigq
->info
.si_signo
,
2066 timer
->sigq
->info
.si_value
.sival_ptr
);
2067 seq_printf(m
, "notify: %s/%s.%d\n",
2068 nstr
[notify
& ~SIGEV_THREAD_ID
],
2069 (notify
& SIGEV_THREAD_ID
) ? "tid" : "pid",
2070 pid_nr_ns(timer
->it_pid
, tp
->ns
));
2071 seq_printf(m
, "ClockID: %d\n", timer
->it_clock
);
2076 static const struct seq_operations proc_timers_seq_ops
= {
2077 .start
= timers_start
,
2078 .next
= timers_next
,
2079 .stop
= timers_stop
,
2083 static int proc_timers_open(struct inode
*inode
, struct file
*file
)
2085 struct timers_private
*tp
;
2087 tp
= __seq_open_private(file
, &proc_timers_seq_ops
,
2088 sizeof(struct timers_private
));
2092 tp
->pid
= proc_pid(inode
);
2093 tp
->ns
= inode
->i_sb
->s_fs_info
;
2097 static const struct file_operations proc_timers_operations
= {
2098 .open
= proc_timers_open
,
2100 .llseek
= seq_lseek
,
2101 .release
= seq_release_private
,
2103 #endif /* CONFIG_CHECKPOINT_RESTORE */
2105 static int proc_pident_instantiate(struct inode
*dir
,
2106 struct dentry
*dentry
, struct task_struct
*task
, const void *ptr
)
2108 const struct pid_entry
*p
= ptr
;
2109 struct inode
*inode
;
2110 struct proc_inode
*ei
;
2112 inode
= proc_pid_make_inode(dir
->i_sb
, task
);
2117 inode
->i_mode
= p
->mode
;
2118 if (S_ISDIR(inode
->i_mode
))
2119 set_nlink(inode
, 2); /* Use getattr to fix if necessary */
2121 inode
->i_op
= p
->iop
;
2123 inode
->i_fop
= p
->fop
;
2125 d_set_d_op(dentry
, &pid_dentry_operations
);
2126 d_add(dentry
, inode
);
2127 /* Close the race of the process dying before we return the dentry */
2128 if (pid_revalidate(dentry
, 0))
2134 static struct dentry
*proc_pident_lookup(struct inode
*dir
,
2135 struct dentry
*dentry
,
2136 const struct pid_entry
*ents
,
2140 struct task_struct
*task
= get_proc_task(dir
);
2141 const struct pid_entry
*p
, *last
;
2149 * Yes, it does not scale. And it should not. Don't add
2150 * new entries into /proc/<tgid>/ without very good reasons.
2152 last
= &ents
[nents
- 1];
2153 for (p
= ents
; p
<= last
; p
++) {
2154 if (p
->len
!= dentry
->d_name
.len
)
2156 if (!memcmp(dentry
->d_name
.name
, p
->name
, p
->len
))
2162 error
= proc_pident_instantiate(dir
, dentry
, task
, p
);
2164 put_task_struct(task
);
2166 return ERR_PTR(error
);
2169 static int proc_pident_readdir(struct file
*file
, struct dir_context
*ctx
,
2170 const struct pid_entry
*ents
, unsigned int nents
)
2172 struct task_struct
*task
= get_proc_task(file_inode(file
));
2173 const struct pid_entry
*p
;
2178 if (!dir_emit_dots(file
, ctx
))
2181 if (ctx
->pos
>= nents
+ 2)
2184 for (p
= ents
+ (ctx
->pos
- 2); p
<= ents
+ nents
- 1; p
++) {
2185 if (!proc_fill_cache(file
, ctx
, p
->name
, p
->len
,
2186 proc_pident_instantiate
, task
, p
))
2191 put_task_struct(task
);
2195 #ifdef CONFIG_SECURITY
2196 static ssize_t
proc_pid_attr_read(struct file
* file
, char __user
* buf
,
2197 size_t count
, loff_t
*ppos
)
2199 struct inode
* inode
= file_inode(file
);
2202 struct task_struct
*task
= get_proc_task(inode
);
2207 length
= security_getprocattr(task
,
2208 (char*)file
->f_path
.dentry
->d_name
.name
,
2210 put_task_struct(task
);
2212 length
= simple_read_from_buffer(buf
, count
, ppos
, p
, length
);
2217 static ssize_t
proc_pid_attr_write(struct file
* file
, const char __user
* buf
,
2218 size_t count
, loff_t
*ppos
)
2220 struct inode
* inode
= file_inode(file
);
2223 struct task_struct
*task
= get_proc_task(inode
);
2228 if (count
> PAGE_SIZE
)
2231 /* No partial writes. */
2237 page
= (char*)__get_free_page(GFP_TEMPORARY
);
2242 if (copy_from_user(page
, buf
, count
))
2245 /* Guard against adverse ptrace interaction */
2246 length
= mutex_lock_interruptible(&task
->signal
->cred_guard_mutex
);
2250 length
= security_setprocattr(task
,
2251 (char*)file
->f_path
.dentry
->d_name
.name
,
2252 (void*)page
, count
);
2253 mutex_unlock(&task
->signal
->cred_guard_mutex
);
2255 free_page((unsigned long) page
);
2257 put_task_struct(task
);
2262 static const struct file_operations proc_pid_attr_operations
= {
2263 .read
= proc_pid_attr_read
,
2264 .write
= proc_pid_attr_write
,
2265 .llseek
= generic_file_llseek
,
2268 static const struct pid_entry attr_dir_stuff
[] = {
2269 REG("current", S_IRUGO
|S_IWUGO
, proc_pid_attr_operations
),
2270 REG("prev", S_IRUGO
, proc_pid_attr_operations
),
2271 REG("exec", S_IRUGO
|S_IWUGO
, proc_pid_attr_operations
),
2272 REG("fscreate", S_IRUGO
|S_IWUGO
, proc_pid_attr_operations
),
2273 REG("keycreate", S_IRUGO
|S_IWUGO
, proc_pid_attr_operations
),
2274 REG("sockcreate", S_IRUGO
|S_IWUGO
, proc_pid_attr_operations
),
2277 static int proc_attr_dir_readdir(struct file
*file
, struct dir_context
*ctx
)
2279 return proc_pident_readdir(file
, ctx
,
2280 attr_dir_stuff
, ARRAY_SIZE(attr_dir_stuff
));
2283 static const struct file_operations proc_attr_dir_operations
= {
2284 .read
= generic_read_dir
,
2285 .iterate
= proc_attr_dir_readdir
,
2286 .llseek
= default_llseek
,
2289 static struct dentry
*proc_attr_dir_lookup(struct inode
*dir
,
2290 struct dentry
*dentry
, unsigned int flags
)
2292 return proc_pident_lookup(dir
, dentry
,
2293 attr_dir_stuff
, ARRAY_SIZE(attr_dir_stuff
));
2296 static const struct inode_operations proc_attr_dir_inode_operations
= {
2297 .lookup
= proc_attr_dir_lookup
,
2298 .getattr
= pid_getattr
,
2299 .setattr
= proc_setattr
,
2304 #ifdef CONFIG_ELF_CORE
2305 static ssize_t
proc_coredump_filter_read(struct file
*file
, char __user
*buf
,
2306 size_t count
, loff_t
*ppos
)
2308 struct task_struct
*task
= get_proc_task(file_inode(file
));
2309 struct mm_struct
*mm
;
2310 char buffer
[PROC_NUMBUF
];
2318 mm
= get_task_mm(task
);
2320 len
= snprintf(buffer
, sizeof(buffer
), "%08lx\n",
2321 ((mm
->flags
& MMF_DUMP_FILTER_MASK
) >>
2322 MMF_DUMP_FILTER_SHIFT
));
2324 ret
= simple_read_from_buffer(buf
, count
, ppos
, buffer
, len
);
2327 put_task_struct(task
);
2332 static ssize_t
proc_coredump_filter_write(struct file
*file
,
2333 const char __user
*buf
,
2337 struct task_struct
*task
;
2338 struct mm_struct
*mm
;
2339 char buffer
[PROC_NUMBUF
], *end
;
2346 memset(buffer
, 0, sizeof(buffer
));
2347 if (count
> sizeof(buffer
) - 1)
2348 count
= sizeof(buffer
) - 1;
2349 if (copy_from_user(buffer
, buf
, count
))
2353 val
= (unsigned int)simple_strtoul(buffer
, &end
, 0);
2356 if (end
- buffer
== 0)
2360 task
= get_proc_task(file_inode(file
));
2365 mm
= get_task_mm(task
);
2369 for (i
= 0, mask
= 1; i
< MMF_DUMP_FILTER_BITS
; i
++, mask
<<= 1) {
2371 set_bit(i
+ MMF_DUMP_FILTER_SHIFT
, &mm
->flags
);
2373 clear_bit(i
+ MMF_DUMP_FILTER_SHIFT
, &mm
->flags
);
2378 put_task_struct(task
);
2383 static const struct file_operations proc_coredump_filter_operations
= {
2384 .read
= proc_coredump_filter_read
,
2385 .write
= proc_coredump_filter_write
,
2386 .llseek
= generic_file_llseek
,
2390 #ifdef CONFIG_TASK_IO_ACCOUNTING
2391 static int do_io_accounting(struct task_struct
*task
, char *buffer
, int whole
)
2393 struct task_io_accounting acct
= task
->ioac
;
2394 unsigned long flags
;
2397 result
= mutex_lock_killable(&task
->signal
->cred_guard_mutex
);
2401 if (!ptrace_may_access(task
, PTRACE_MODE_READ
)) {
2406 if (whole
&& lock_task_sighand(task
, &flags
)) {
2407 struct task_struct
*t
= task
;
2409 task_io_accounting_add(&acct
, &task
->signal
->ioac
);
2410 while_each_thread(task
, t
)
2411 task_io_accounting_add(&acct
, &t
->ioac
);
2413 unlock_task_sighand(task
, &flags
);
2415 result
= sprintf(buffer
,
2420 "read_bytes: %llu\n"
2421 "write_bytes: %llu\n"
2422 "cancelled_write_bytes: %llu\n",
2423 (unsigned long long)acct
.rchar
,
2424 (unsigned long long)acct
.wchar
,
2425 (unsigned long long)acct
.syscr
,
2426 (unsigned long long)acct
.syscw
,
2427 (unsigned long long)acct
.read_bytes
,
2428 (unsigned long long)acct
.write_bytes
,
2429 (unsigned long long)acct
.cancelled_write_bytes
);
2431 mutex_unlock(&task
->signal
->cred_guard_mutex
);
2435 static int proc_tid_io_accounting(struct task_struct
*task
, char *buffer
)
2437 return do_io_accounting(task
, buffer
, 0);
2440 static int proc_tgid_io_accounting(struct task_struct
*task
, char *buffer
)
2442 return do_io_accounting(task
, buffer
, 1);
2444 #endif /* CONFIG_TASK_IO_ACCOUNTING */
2446 #ifdef CONFIG_USER_NS
2447 static int proc_id_map_open(struct inode
*inode
, struct file
*file
,
2448 const struct seq_operations
*seq_ops
)
2450 struct user_namespace
*ns
= NULL
;
2451 struct task_struct
*task
;
2452 struct seq_file
*seq
;
2455 task
= get_proc_task(inode
);
2458 ns
= get_user_ns(task_cred_xxx(task
, user_ns
));
2460 put_task_struct(task
);
2465 ret
= seq_open(file
, seq_ops
);
2469 seq
= file
->private_data
;
2479 static int proc_id_map_release(struct inode
*inode
, struct file
*file
)
2481 struct seq_file
*seq
= file
->private_data
;
2482 struct user_namespace
*ns
= seq
->private;
2484 return seq_release(inode
, file
);
2487 static int proc_uid_map_open(struct inode
*inode
, struct file
*file
)
2489 return proc_id_map_open(inode
, file
, &proc_uid_seq_operations
);
2492 static int proc_gid_map_open(struct inode
*inode
, struct file
*file
)
2494 return proc_id_map_open(inode
, file
, &proc_gid_seq_operations
);
2497 static int proc_projid_map_open(struct inode
*inode
, struct file
*file
)
2499 return proc_id_map_open(inode
, file
, &proc_projid_seq_operations
);
2502 static const struct file_operations proc_uid_map_operations
= {
2503 .open
= proc_uid_map_open
,
2504 .write
= proc_uid_map_write
,
2506 .llseek
= seq_lseek
,
2507 .release
= proc_id_map_release
,
2510 static const struct file_operations proc_gid_map_operations
= {
2511 .open
= proc_gid_map_open
,
2512 .write
= proc_gid_map_write
,
2514 .llseek
= seq_lseek
,
2515 .release
= proc_id_map_release
,
2518 static const struct file_operations proc_projid_map_operations
= {
2519 .open
= proc_projid_map_open
,
2520 .write
= proc_projid_map_write
,
2522 .llseek
= seq_lseek
,
2523 .release
= proc_id_map_release
,
2525 #endif /* CONFIG_USER_NS */
2527 static int proc_pid_personality(struct seq_file
*m
, struct pid_namespace
*ns
,
2528 struct pid
*pid
, struct task_struct
*task
)
2530 int err
= lock_trace(task
);
2532 seq_printf(m
, "%08x\n", task
->personality
);
2541 static const struct file_operations proc_task_operations
;
2542 static const struct inode_operations proc_task_inode_operations
;
2544 static const struct pid_entry tgid_base_stuff
[] = {
2545 DIR("task", S_IRUGO
|S_IXUGO
, proc_task_inode_operations
, proc_task_operations
),
2546 DIR("fd", S_IRUSR
|S_IXUSR
, proc_fd_inode_operations
, proc_fd_operations
),
2547 #ifdef CONFIG_CHECKPOINT_RESTORE
2548 DIR("map_files", S_IRUSR
|S_IXUSR
, proc_map_files_inode_operations
, proc_map_files_operations
),
2550 DIR("fdinfo", S_IRUSR
|S_IXUSR
, proc_fdinfo_inode_operations
, proc_fdinfo_operations
),
2551 DIR("ns", S_IRUSR
|S_IXUGO
, proc_ns_dir_inode_operations
, proc_ns_dir_operations
),
2553 DIR("net", S_IRUGO
|S_IXUGO
, proc_net_inode_operations
, proc_net_operations
),
2555 REG("environ", S_IRUSR
, proc_environ_operations
),
2556 ONE("auxv", S_IRUSR
, proc_pid_auxv
),
2557 ONE("status", S_IRUGO
, proc_pid_status
),
2558 ONE("personality", S_IRUSR
, proc_pid_personality
),
2559 ONE("limits", S_IRUGO
, proc_pid_limits
),
2560 #ifdef CONFIG_SCHED_DEBUG
2561 REG("sched", S_IRUGO
|S_IWUSR
, proc_pid_sched_operations
),
2563 #ifdef CONFIG_SCHED_AUTOGROUP
2564 REG("autogroup", S_IRUGO
|S_IWUSR
, proc_pid_sched_autogroup_operations
),
2566 REG("comm", S_IRUGO
|S_IWUSR
, proc_pid_set_comm_operations
),
2567 #ifdef CONFIG_HAVE_ARCH_TRACEHOOK
2568 ONE("syscall", S_IRUSR
, proc_pid_syscall
),
2570 INF("cmdline", S_IRUGO
, proc_pid_cmdline
),
2571 ONE("stat", S_IRUGO
, proc_tgid_stat
),
2572 ONE("statm", S_IRUGO
, proc_pid_statm
),
2573 REG("maps", S_IRUGO
, proc_pid_maps_operations
),
2575 REG("numa_maps", S_IRUGO
, proc_pid_numa_maps_operations
),
2577 REG("mem", S_IRUSR
|S_IWUSR
, proc_mem_operations
),
2578 LNK("cwd", proc_cwd_link
),
2579 LNK("root", proc_root_link
),
2580 LNK("exe", proc_exe_link
),
2581 REG("mounts", S_IRUGO
, proc_mounts_operations
),
2582 REG("mountinfo", S_IRUGO
, proc_mountinfo_operations
),
2583 REG("mountstats", S_IRUSR
, proc_mountstats_operations
),
2584 #ifdef CONFIG_PROC_PAGE_MONITOR
2585 REG("clear_refs", S_IWUSR
, proc_clear_refs_operations
),
2586 REG("smaps", S_IRUGO
, proc_pid_smaps_operations
),
2587 REG("pagemap", S_IRUSR
, proc_pagemap_operations
),
2589 #ifdef CONFIG_SECURITY
2590 DIR("attr", S_IRUGO
|S_IXUGO
, proc_attr_dir_inode_operations
, proc_attr_dir_operations
),
2592 #ifdef CONFIG_KALLSYMS
2593 INF("wchan", S_IRUGO
, proc_pid_wchan
),
2595 #ifdef CONFIG_STACKTRACE
2596 ONE("stack", S_IRUSR
, proc_pid_stack
),
2598 #ifdef CONFIG_SCHEDSTATS
2599 INF("schedstat", S_IRUGO
, proc_pid_schedstat
),
2601 #ifdef CONFIG_LATENCYTOP
2602 REG("latency", S_IRUGO
, proc_lstats_operations
),
2604 #ifdef CONFIG_PROC_PID_CPUSET
2605 REG("cpuset", S_IRUGO
, proc_cpuset_operations
),
2607 #ifdef CONFIG_CGROUPS
2608 REG("cgroup", S_IRUGO
, proc_cgroup_operations
),
2610 INF("oom_score", S_IRUGO
, proc_oom_score
),
2611 REG("oom_adj", S_IRUGO
|S_IWUSR
, proc_oom_adj_operations
),
2612 REG("oom_score_adj", S_IRUGO
|S_IWUSR
, proc_oom_score_adj_operations
),
2613 #ifdef CONFIG_AUDITSYSCALL
2614 REG("loginuid", S_IWUSR
|S_IRUGO
, proc_loginuid_operations
),
2615 REG("sessionid", S_IRUGO
, proc_sessionid_operations
),
2617 #ifdef CONFIG_FAULT_INJECTION
2618 REG("make-it-fail", S_IRUGO
|S_IWUSR
, proc_fault_inject_operations
),
2620 #ifdef CONFIG_ELF_CORE
2621 REG("coredump_filter", S_IRUGO
|S_IWUSR
, proc_coredump_filter_operations
),
2623 #ifdef CONFIG_TASK_IO_ACCOUNTING
2624 INF("io", S_IRUSR
, proc_tgid_io_accounting
),
2626 #ifdef CONFIG_HARDWALL
2627 INF("hardwall", S_IRUGO
, proc_pid_hardwall
),
2629 #ifdef CONFIG_USER_NS
2630 REG("uid_map", S_IRUGO
|S_IWUSR
, proc_uid_map_operations
),
2631 REG("gid_map", S_IRUGO
|S_IWUSR
, proc_gid_map_operations
),
2632 REG("projid_map", S_IRUGO
|S_IWUSR
, proc_projid_map_operations
),
2634 #ifdef CONFIG_CHECKPOINT_RESTORE
2635 REG("timers", S_IRUGO
, proc_timers_operations
),
2639 static int proc_tgid_base_readdir(struct file
*file
, struct dir_context
*ctx
)
2641 return proc_pident_readdir(file
, ctx
,
2642 tgid_base_stuff
, ARRAY_SIZE(tgid_base_stuff
));
2645 static const struct file_operations proc_tgid_base_operations
= {
2646 .read
= generic_read_dir
,
2647 .iterate
= proc_tgid_base_readdir
,
2648 .llseek
= default_llseek
,
2651 static struct dentry
*proc_tgid_base_lookup(struct inode
*dir
, struct dentry
*dentry
, unsigned int flags
)
2653 return proc_pident_lookup(dir
, dentry
,
2654 tgid_base_stuff
, ARRAY_SIZE(tgid_base_stuff
));
2657 static const struct inode_operations proc_tgid_base_inode_operations
= {
2658 .lookup
= proc_tgid_base_lookup
,
2659 .getattr
= pid_getattr
,
2660 .setattr
= proc_setattr
,
2661 .permission
= proc_pid_permission
,
2664 static void proc_flush_task_mnt(struct vfsmount
*mnt
, pid_t pid
, pid_t tgid
)
2666 struct dentry
*dentry
, *leader
, *dir
;
2667 char buf
[PROC_NUMBUF
];
2671 name
.len
= snprintf(buf
, sizeof(buf
), "%d", pid
);
2672 /* no ->d_hash() rejects on procfs */
2673 dentry
= d_hash_and_lookup(mnt
->mnt_root
, &name
);
2675 shrink_dcache_parent(dentry
);
2681 name
.len
= snprintf(buf
, sizeof(buf
), "%d", tgid
);
2682 leader
= d_hash_and_lookup(mnt
->mnt_root
, &name
);
2687 name
.len
= strlen(name
.name
);
2688 dir
= d_hash_and_lookup(leader
, &name
);
2690 goto out_put_leader
;
2693 name
.len
= snprintf(buf
, sizeof(buf
), "%d", pid
);
2694 dentry
= d_hash_and_lookup(dir
, &name
);
2696 shrink_dcache_parent(dentry
);
2709 * proc_flush_task - Remove dcache entries for @task from the /proc dcache.
2710 * @task: task that should be flushed.
2712 * When flushing dentries from proc, one needs to flush them from global
2713 * proc (proc_mnt) and from all the namespaces' procs this task was seen
2714 * in. This call is supposed to do all of this job.
2716 * Looks in the dcache for
2718 * /proc/@tgid/task/@pid
2719 * if either directory is present flushes it and all of it'ts children
2722 * It is safe and reasonable to cache /proc entries for a task until
2723 * that task exits. After that they just clog up the dcache with
2724 * useless entries, possibly causing useful dcache entries to be
2725 * flushed instead. This routine is proved to flush those useless
2726 * dcache entries at process exit time.
2728 * NOTE: This routine is just an optimization so it does not guarantee
2729 * that no dcache entries will exist at process exit time it
2730 * just makes it very unlikely that any will persist.
2733 void proc_flush_task(struct task_struct
*task
)
2736 struct pid
*pid
, *tgid
;
2739 pid
= task_pid(task
);
2740 tgid
= task_tgid(task
);
2742 for (i
= 0; i
<= pid
->level
; i
++) {
2743 upid
= &pid
->numbers
[i
];
2744 proc_flush_task_mnt(upid
->ns
->proc_mnt
, upid
->nr
,
2745 tgid
->numbers
[i
].nr
);
2749 static int proc_pid_instantiate(struct inode
*dir
,
2750 struct dentry
* dentry
,
2751 struct task_struct
*task
, const void *ptr
)
2753 struct inode
*inode
;
2755 inode
= proc_pid_make_inode(dir
->i_sb
, task
);
2759 inode
->i_mode
= S_IFDIR
|S_IRUGO
|S_IXUGO
;
2760 inode
->i_op
= &proc_tgid_base_inode_operations
;
2761 inode
->i_fop
= &proc_tgid_base_operations
;
2762 inode
->i_flags
|=S_IMMUTABLE
;
2764 set_nlink(inode
, 2 + pid_entry_count_dirs(tgid_base_stuff
,
2765 ARRAY_SIZE(tgid_base_stuff
)));
2767 d_set_d_op(dentry
, &pid_dentry_operations
);
2769 d_add(dentry
, inode
);
2770 /* Close the race of the process dying before we return the dentry */
2771 if (pid_revalidate(dentry
, 0))
2777 struct dentry
*proc_pid_lookup(struct inode
*dir
, struct dentry
* dentry
, unsigned int flags
)
2779 int result
= -ENOENT
;
2780 struct task_struct
*task
;
2782 struct pid_namespace
*ns
;
2784 tgid
= name_to_int(&dentry
->d_name
);
2788 ns
= dentry
->d_sb
->s_fs_info
;
2790 task
= find_task_by_pid_ns(tgid
, ns
);
2792 get_task_struct(task
);
2797 result
= proc_pid_instantiate(dir
, dentry
, task
, NULL
);
2798 put_task_struct(task
);
2800 return ERR_PTR(result
);
2804 * Find the first task with tgid >= tgid
2809 struct task_struct
*task
;
2811 static struct tgid_iter
next_tgid(struct pid_namespace
*ns
, struct tgid_iter iter
)
2816 put_task_struct(iter
.task
);
2820 pid
= find_ge_pid(iter
.tgid
, ns
);
2822 iter
.tgid
= pid_nr_ns(pid
, ns
);
2823 iter
.task
= pid_task(pid
, PIDTYPE_PID
);
2824 /* What we to know is if the pid we have find is the
2825 * pid of a thread_group_leader. Testing for task
2826 * being a thread_group_leader is the obvious thing
2827 * todo but there is a window when it fails, due to
2828 * the pid transfer logic in de_thread.
2830 * So we perform the straight forward test of seeing
2831 * if the pid we have found is the pid of a thread
2832 * group leader, and don't worry if the task we have
2833 * found doesn't happen to be a thread group leader.
2834 * As we don't care in the case of readdir.
2836 if (!iter
.task
|| !has_group_leader_pid(iter
.task
)) {
2840 get_task_struct(iter
.task
);
2846 #define TGID_OFFSET (FIRST_PROCESS_ENTRY + 1)
2848 /* for the /proc/ directory itself, after non-process stuff has been done */
2849 int proc_pid_readdir(struct file
*file
, struct dir_context
*ctx
)
2851 struct tgid_iter iter
;
2852 struct pid_namespace
*ns
= file
->f_dentry
->d_sb
->s_fs_info
;
2853 loff_t pos
= ctx
->pos
;
2855 if (pos
>= PID_MAX_LIMIT
+ TGID_OFFSET
)
2858 if (pos
== TGID_OFFSET
- 1) {
2859 struct inode
*inode
= ns
->proc_self
->d_inode
;
2860 if (!dir_emit(ctx
, "self", 4, inode
->i_ino
, DT_LNK
))
2864 iter
.tgid
= pos
- TGID_OFFSET
;
2867 for (iter
= next_tgid(ns
, iter
);
2869 iter
.tgid
+= 1, iter
= next_tgid(ns
, iter
)) {
2870 char name
[PROC_NUMBUF
];
2872 if (!has_pid_permissions(ns
, iter
.task
, 2))
2875 len
= snprintf(name
, sizeof(name
), "%d", iter
.tgid
);
2876 ctx
->pos
= iter
.tgid
+ TGID_OFFSET
;
2877 if (!proc_fill_cache(file
, ctx
, name
, len
,
2878 proc_pid_instantiate
, iter
.task
, NULL
)) {
2879 put_task_struct(iter
.task
);
2883 ctx
->pos
= PID_MAX_LIMIT
+ TGID_OFFSET
;
2890 static const struct pid_entry tid_base_stuff
[] = {
2891 DIR("fd", S_IRUSR
|S_IXUSR
, proc_fd_inode_operations
, proc_fd_operations
),
2892 DIR("fdinfo", S_IRUSR
|S_IXUSR
, proc_fdinfo_inode_operations
, proc_fdinfo_operations
),
2893 DIR("ns", S_IRUSR
|S_IXUGO
, proc_ns_dir_inode_operations
, proc_ns_dir_operations
),
2894 REG("environ", S_IRUSR
, proc_environ_operations
),
2895 ONE("auxv", S_IRUSR
, proc_pid_auxv
),
2896 ONE("status", S_IRUGO
, proc_pid_status
),
2897 ONE("personality", S_IRUSR
, proc_pid_personality
),
2898 ONE("limits", S_IRUGO
, proc_pid_limits
),
2899 #ifdef CONFIG_SCHED_DEBUG
2900 REG("sched", S_IRUGO
|S_IWUSR
, proc_pid_sched_operations
),
2902 REG("comm", S_IRUGO
|S_IWUSR
, proc_pid_set_comm_operations
),
2903 #ifdef CONFIG_HAVE_ARCH_TRACEHOOK
2904 ONE("syscall", S_IRUSR
, proc_pid_syscall
),
2906 INF("cmdline", S_IRUGO
, proc_pid_cmdline
),
2907 ONE("stat", S_IRUGO
, proc_tid_stat
),
2908 ONE("statm", S_IRUGO
, proc_pid_statm
),
2909 REG("maps", S_IRUGO
, proc_tid_maps_operations
),
2910 #ifdef CONFIG_CHECKPOINT_RESTORE
2911 REG("children", S_IRUGO
, proc_tid_children_operations
),
2914 REG("numa_maps", S_IRUGO
, proc_tid_numa_maps_operations
),
2916 REG("mem", S_IRUSR
|S_IWUSR
, proc_mem_operations
),
2917 LNK("cwd", proc_cwd_link
),
2918 LNK("root", proc_root_link
),
2919 LNK("exe", proc_exe_link
),
2920 REG("mounts", S_IRUGO
, proc_mounts_operations
),
2921 REG("mountinfo", S_IRUGO
, proc_mountinfo_operations
),
2922 #ifdef CONFIG_PROC_PAGE_MONITOR
2923 REG("clear_refs", S_IWUSR
, proc_clear_refs_operations
),
2924 REG("smaps", S_IRUGO
, proc_tid_smaps_operations
),
2925 REG("pagemap", S_IRUSR
, proc_pagemap_operations
),
2927 #ifdef CONFIG_SECURITY
2928 DIR("attr", S_IRUGO
|S_IXUGO
, proc_attr_dir_inode_operations
, proc_attr_dir_operations
),
2930 #ifdef CONFIG_KALLSYMS
2931 INF("wchan", S_IRUGO
, proc_pid_wchan
),
2933 #ifdef CONFIG_STACKTRACE
2934 ONE("stack", S_IRUSR
, proc_pid_stack
),
2936 #ifdef CONFIG_SCHEDSTATS
2937 INF("schedstat", S_IRUGO
, proc_pid_schedstat
),
2939 #ifdef CONFIG_LATENCYTOP
2940 REG("latency", S_IRUGO
, proc_lstats_operations
),
2942 #ifdef CONFIG_PROC_PID_CPUSET
2943 REG("cpuset", S_IRUGO
, proc_cpuset_operations
),
2945 #ifdef CONFIG_CGROUPS
2946 REG("cgroup", S_IRUGO
, proc_cgroup_operations
),
2948 INF("oom_score", S_IRUGO
, proc_oom_score
),
2949 REG("oom_adj", S_IRUGO
|S_IWUSR
, proc_oom_adj_operations
),
2950 REG("oom_score_adj", S_IRUGO
|S_IWUSR
, proc_oom_score_adj_operations
),
2951 #ifdef CONFIG_AUDITSYSCALL
2952 REG("loginuid", S_IWUSR
|S_IRUGO
, proc_loginuid_operations
),
2953 REG("sessionid", S_IRUGO
, proc_sessionid_operations
),
2955 #ifdef CONFIG_FAULT_INJECTION
2956 REG("make-it-fail", S_IRUGO
|S_IWUSR
, proc_fault_inject_operations
),
2958 #ifdef CONFIG_TASK_IO_ACCOUNTING
2959 INF("io", S_IRUSR
, proc_tid_io_accounting
),
2961 #ifdef CONFIG_HARDWALL
2962 INF("hardwall", S_IRUGO
, proc_pid_hardwall
),
2964 #ifdef CONFIG_USER_NS
2965 REG("uid_map", S_IRUGO
|S_IWUSR
, proc_uid_map_operations
),
2966 REG("gid_map", S_IRUGO
|S_IWUSR
, proc_gid_map_operations
),
2967 REG("projid_map", S_IRUGO
|S_IWUSR
, proc_projid_map_operations
),
2971 static int proc_tid_base_readdir(struct file
*file
, struct dir_context
*ctx
)
2973 return proc_pident_readdir(file
, ctx
,
2974 tid_base_stuff
, ARRAY_SIZE(tid_base_stuff
));
2977 static struct dentry
*proc_tid_base_lookup(struct inode
*dir
, struct dentry
*dentry
, unsigned int flags
)
2979 return proc_pident_lookup(dir
, dentry
,
2980 tid_base_stuff
, ARRAY_SIZE(tid_base_stuff
));
2983 static const struct file_operations proc_tid_base_operations
= {
2984 .read
= generic_read_dir
,
2985 .iterate
= proc_tid_base_readdir
,
2986 .llseek
= default_llseek
,
2989 static const struct inode_operations proc_tid_base_inode_operations
= {
2990 .lookup
= proc_tid_base_lookup
,
2991 .getattr
= pid_getattr
,
2992 .setattr
= proc_setattr
,
2995 static int proc_task_instantiate(struct inode
*dir
,
2996 struct dentry
*dentry
, struct task_struct
*task
, const void *ptr
)
2998 struct inode
*inode
;
2999 inode
= proc_pid_make_inode(dir
->i_sb
, task
);
3003 inode
->i_mode
= S_IFDIR
|S_IRUGO
|S_IXUGO
;
3004 inode
->i_op
= &proc_tid_base_inode_operations
;
3005 inode
->i_fop
= &proc_tid_base_operations
;
3006 inode
->i_flags
|=S_IMMUTABLE
;
3008 set_nlink(inode
, 2 + pid_entry_count_dirs(tid_base_stuff
,
3009 ARRAY_SIZE(tid_base_stuff
)));
3011 d_set_d_op(dentry
, &pid_dentry_operations
);
3013 d_add(dentry
, inode
);
3014 /* Close the race of the process dying before we return the dentry */
3015 if (pid_revalidate(dentry
, 0))
3021 static struct dentry
*proc_task_lookup(struct inode
*dir
, struct dentry
* dentry
, unsigned int flags
)
3023 int result
= -ENOENT
;
3024 struct task_struct
*task
;
3025 struct task_struct
*leader
= get_proc_task(dir
);
3027 struct pid_namespace
*ns
;
3032 tid
= name_to_int(&dentry
->d_name
);
3036 ns
= dentry
->d_sb
->s_fs_info
;
3038 task
= find_task_by_pid_ns(tid
, ns
);
3040 get_task_struct(task
);
3044 if (!same_thread_group(leader
, task
))
3047 result
= proc_task_instantiate(dir
, dentry
, task
, NULL
);
3049 put_task_struct(task
);
3051 put_task_struct(leader
);
3053 return ERR_PTR(result
);
3057 * Find the first tid of a thread group to return to user space.
3059 * Usually this is just the thread group leader, but if the users
3060 * buffer was too small or there was a seek into the middle of the
3061 * directory we have more work todo.
3063 * In the case of a short read we start with find_task_by_pid.
3065 * In the case of a seek we start with the leader and walk nr
3068 static struct task_struct
*first_tid(struct pid
*pid
, int tid
, loff_t f_pos
,
3069 struct pid_namespace
*ns
)
3071 struct task_struct
*pos
, *task
;
3072 unsigned long nr
= f_pos
;
3074 if (nr
!= f_pos
) /* 32bit overflow? */
3078 task
= pid_task(pid
, PIDTYPE_PID
);
3082 /* Attempt to start with the tid of a thread */
3084 pos
= find_task_by_pid_ns(tid
, ns
);
3085 if (pos
&& same_thread_group(pos
, task
))
3089 /* If nr exceeds the number of threads there is nothing todo */
3090 if (nr
>= get_nr_threads(task
))
3093 /* If we haven't found our starting place yet start
3094 * with the leader and walk nr threads forward.
3096 pos
= task
= task
->group_leader
;
3100 } while_each_thread(task
, pos
);
3105 get_task_struct(pos
);
3112 * Find the next thread in the thread list.
3113 * Return NULL if there is an error or no next thread.
3115 * The reference to the input task_struct is released.
3117 static struct task_struct
*next_tid(struct task_struct
*start
)
3119 struct task_struct
*pos
= NULL
;
3121 if (pid_alive(start
)) {
3122 pos
= next_thread(start
);
3123 if (thread_group_leader(pos
))
3126 get_task_struct(pos
);
3129 put_task_struct(start
);
3133 /* for the /proc/TGID/task/ directories */
3134 static int proc_task_readdir(struct file
*file
, struct dir_context
*ctx
)
3136 struct inode
*inode
= file_inode(file
);
3137 struct task_struct
*task
;
3138 struct pid_namespace
*ns
;
3141 if (proc_inode_is_dead(inode
))
3144 if (!dir_emit_dots(file
, ctx
))
3147 /* f_version caches the tgid value that the last readdir call couldn't
3148 * return. lseek aka telldir automagically resets f_version to 0.
3150 ns
= file
->f_dentry
->d_sb
->s_fs_info
;
3151 tid
= (int)file
->f_version
;
3152 file
->f_version
= 0;
3153 for (task
= first_tid(proc_pid(inode
), tid
, ctx
->pos
- 2, ns
);
3155 task
= next_tid(task
), ctx
->pos
++) {
3156 char name
[PROC_NUMBUF
];
3158 tid
= task_pid_nr_ns(task
, ns
);
3159 len
= snprintf(name
, sizeof(name
), "%d", tid
);
3160 if (!proc_fill_cache(file
, ctx
, name
, len
,
3161 proc_task_instantiate
, task
, NULL
)) {
3162 /* returning this tgid failed, save it as the first
3163 * pid for the next readir call */
3164 file
->f_version
= (u64
)tid
;
3165 put_task_struct(task
);
3173 static int proc_task_getattr(struct vfsmount
*mnt
, struct dentry
*dentry
, struct kstat
*stat
)
3175 struct inode
*inode
= dentry
->d_inode
;
3176 struct task_struct
*p
= get_proc_task(inode
);
3177 generic_fillattr(inode
, stat
);
3180 stat
->nlink
+= get_nr_threads(p
);
3187 static const struct inode_operations proc_task_inode_operations
= {
3188 .lookup
= proc_task_lookup
,
3189 .getattr
= proc_task_getattr
,
3190 .setattr
= proc_setattr
,
3191 .permission
= proc_pid_permission
,
3194 static const struct file_operations proc_task_operations
= {
3195 .read
= generic_read_dir
,
3196 .iterate
= proc_task_readdir
,
3197 .llseek
= default_llseek
,