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/cgroup.h>
77 #include <linux/cpuset.h>
78 #include <linux/audit.h>
79 #include <linux/poll.h>
80 #include <linux/nsproxy.h>
81 #include <linux/oom.h>
82 #include <linux/elf.h>
83 #include <linux/pid_namespace.h>
84 #include <linux/fs_struct.h>
85 #include <linux/slab.h>
86 #include <linux/flex_array.h>
87 #ifdef CONFIG_HARDWALL
88 #include <asm/hardwall.h>
90 #include <trace/events/oom.h>
94 * Implementing inode permission operations in /proc is almost
95 * certainly an error. Permission checks need to happen during
96 * each system call not at open time. The reason is that most of
97 * what we wish to check for permissions in /proc varies at runtime.
99 * The classic example of a problem is opening file descriptors
100 * in /proc for a task before it execs a suid executable.
107 const struct inode_operations
*iop
;
108 const struct file_operations
*fop
;
112 #define NOD(NAME, MODE, IOP, FOP, OP) { \
114 .len = sizeof(NAME) - 1, \
121 #define DIR(NAME, MODE, iops, fops) \
122 NOD(NAME, (S_IFDIR|(MODE)), &iops, &fops, {} )
123 #define LNK(NAME, get_link) \
124 NOD(NAME, (S_IFLNK|S_IRWXUGO), \
125 &proc_pid_link_inode_operations, NULL, \
126 { .proc_get_link = get_link } )
127 #define REG(NAME, MODE, fops) \
128 NOD(NAME, (S_IFREG|(MODE)), NULL, &fops, {})
129 #define INF(NAME, MODE, read) \
130 NOD(NAME, (S_IFREG|(MODE)), \
131 NULL, &proc_info_file_operations, \
132 { .proc_read = read } )
133 #define ONE(NAME, MODE, show) \
134 NOD(NAME, (S_IFREG|(MODE)), \
135 NULL, &proc_single_file_operations, \
136 { .proc_show = show } )
138 static int proc_fd_permission(struct inode
*inode
, int mask
);
141 * Count the number of hardlinks for the pid_entry table, excluding the .
144 static unsigned int pid_entry_count_dirs(const struct pid_entry
*entries
,
151 for (i
= 0; i
< n
; ++i
) {
152 if (S_ISDIR(entries
[i
].mode
))
159 static int get_task_root(struct task_struct
*task
, struct path
*root
)
161 int result
= -ENOENT
;
165 get_fs_root(task
->fs
, root
);
172 static int proc_cwd_link(struct dentry
*dentry
, struct path
*path
)
174 struct task_struct
*task
= get_proc_task(dentry
->d_inode
);
175 int result
= -ENOENT
;
180 get_fs_pwd(task
->fs
, path
);
184 put_task_struct(task
);
189 static int proc_root_link(struct dentry
*dentry
, struct path
*path
)
191 struct task_struct
*task
= get_proc_task(dentry
->d_inode
);
192 int result
= -ENOENT
;
195 result
= get_task_root(task
, path
);
196 put_task_struct(task
);
201 struct mm_struct
*mm_for_maps(struct task_struct
*task
)
203 return mm_access(task
, PTRACE_MODE_READ
);
206 static int proc_pid_cmdline(struct task_struct
*task
, char * buffer
)
210 struct mm_struct
*mm
= get_task_mm(task
);
214 goto out_mm
; /* Shh! No looking before we're done */
216 len
= mm
->arg_end
- mm
->arg_start
;
221 res
= access_process_vm(task
, mm
->arg_start
, buffer
, len
, 0);
223 // If the nul at the end of args has been overwritten, then
224 // assume application is using setproctitle(3).
225 if (res
> 0 && buffer
[res
-1] != '\0' && len
< PAGE_SIZE
) {
226 len
= strnlen(buffer
, res
);
230 len
= mm
->env_end
- mm
->env_start
;
231 if (len
> PAGE_SIZE
- res
)
232 len
= PAGE_SIZE
- res
;
233 res
+= access_process_vm(task
, mm
->env_start
, buffer
+res
, len
, 0);
234 res
= strnlen(buffer
, res
);
243 static int proc_pid_auxv(struct task_struct
*task
, char *buffer
)
245 struct mm_struct
*mm
= mm_for_maps(task
);
246 int res
= PTR_ERR(mm
);
247 if (mm
&& !IS_ERR(mm
)) {
248 unsigned int nwords
= 0;
251 } while (mm
->saved_auxv
[nwords
- 2] != 0); /* AT_NULL */
252 res
= nwords
* sizeof(mm
->saved_auxv
[0]);
255 memcpy(buffer
, mm
->saved_auxv
, res
);
262 #ifdef CONFIG_KALLSYMS
264 * Provides a wchan file via kallsyms in a proper one-value-per-file format.
265 * Returns the resolved symbol. If that fails, simply return the address.
267 static int proc_pid_wchan(struct task_struct
*task
, char *buffer
)
270 char symname
[KSYM_NAME_LEN
];
272 wchan
= get_wchan(task
);
274 if (lookup_symbol_name(wchan
, symname
) < 0)
275 if (!ptrace_may_access(task
, PTRACE_MODE_READ
))
278 return sprintf(buffer
, "%lu", wchan
);
280 return sprintf(buffer
, "%s", symname
);
282 #endif /* CONFIG_KALLSYMS */
284 static int lock_trace(struct task_struct
*task
)
286 int err
= mutex_lock_killable(&task
->signal
->cred_guard_mutex
);
289 if (!ptrace_may_access(task
, PTRACE_MODE_ATTACH
)) {
290 mutex_unlock(&task
->signal
->cred_guard_mutex
);
296 static void unlock_trace(struct task_struct
*task
)
298 mutex_unlock(&task
->signal
->cred_guard_mutex
);
301 #ifdef CONFIG_STACKTRACE
303 #define MAX_STACK_TRACE_DEPTH 64
305 static int proc_pid_stack(struct seq_file
*m
, struct pid_namespace
*ns
,
306 struct pid
*pid
, struct task_struct
*task
)
308 struct stack_trace trace
;
309 unsigned long *entries
;
313 entries
= kmalloc(MAX_STACK_TRACE_DEPTH
* sizeof(*entries
), GFP_KERNEL
);
317 trace
.nr_entries
= 0;
318 trace
.max_entries
= MAX_STACK_TRACE_DEPTH
;
319 trace
.entries
= entries
;
322 err
= lock_trace(task
);
324 save_stack_trace_tsk(task
, &trace
);
326 for (i
= 0; i
< trace
.nr_entries
; i
++) {
327 seq_printf(m
, "[<%pK>] %pS\n",
328 (void *)entries
[i
], (void *)entries
[i
]);
338 #ifdef CONFIG_SCHEDSTATS
340 * Provides /proc/PID/schedstat
342 static int proc_pid_schedstat(struct task_struct
*task
, char *buffer
)
344 return sprintf(buffer
, "%llu %llu %lu\n",
345 (unsigned long long)task
->se
.sum_exec_runtime
,
346 (unsigned long long)task
->sched_info
.run_delay
,
347 task
->sched_info
.pcount
);
351 #ifdef CONFIG_LATENCYTOP
352 static int lstats_show_proc(struct seq_file
*m
, void *v
)
355 struct inode
*inode
= m
->private;
356 struct task_struct
*task
= get_proc_task(inode
);
360 seq_puts(m
, "Latency Top version : v0.1\n");
361 for (i
= 0; i
< 32; i
++) {
362 struct latency_record
*lr
= &task
->latency_record
[i
];
363 if (lr
->backtrace
[0]) {
365 seq_printf(m
, "%i %li %li",
366 lr
->count
, lr
->time
, lr
->max
);
367 for (q
= 0; q
< LT_BACKTRACEDEPTH
; q
++) {
368 unsigned long bt
= lr
->backtrace
[q
];
373 seq_printf(m
, " %ps", (void *)bt
);
379 put_task_struct(task
);
383 static int lstats_open(struct inode
*inode
, struct file
*file
)
385 return single_open(file
, lstats_show_proc
, inode
);
388 static ssize_t
lstats_write(struct file
*file
, const char __user
*buf
,
389 size_t count
, loff_t
*offs
)
391 struct task_struct
*task
= get_proc_task(file
->f_dentry
->d_inode
);
395 clear_all_latency_tracing(task
);
396 put_task_struct(task
);
401 static const struct file_operations proc_lstats_operations
= {
404 .write
= lstats_write
,
406 .release
= single_release
,
411 static int proc_oom_score(struct task_struct
*task
, char *buffer
)
413 unsigned long points
= 0;
415 read_lock(&tasklist_lock
);
417 points
= oom_badness(task
, NULL
, NULL
,
418 totalram_pages
+ total_swap_pages
);
419 read_unlock(&tasklist_lock
);
420 return sprintf(buffer
, "%lu\n", points
);
428 static const struct limit_names lnames
[RLIM_NLIMITS
] = {
429 [RLIMIT_CPU
] = {"Max cpu time", "seconds"},
430 [RLIMIT_FSIZE
] = {"Max file size", "bytes"},
431 [RLIMIT_DATA
] = {"Max data size", "bytes"},
432 [RLIMIT_STACK
] = {"Max stack size", "bytes"},
433 [RLIMIT_CORE
] = {"Max core file size", "bytes"},
434 [RLIMIT_RSS
] = {"Max resident set", "bytes"},
435 [RLIMIT_NPROC
] = {"Max processes", "processes"},
436 [RLIMIT_NOFILE
] = {"Max open files", "files"},
437 [RLIMIT_MEMLOCK
] = {"Max locked memory", "bytes"},
438 [RLIMIT_AS
] = {"Max address space", "bytes"},
439 [RLIMIT_LOCKS
] = {"Max file locks", "locks"},
440 [RLIMIT_SIGPENDING
] = {"Max pending signals", "signals"},
441 [RLIMIT_MSGQUEUE
] = {"Max msgqueue size", "bytes"},
442 [RLIMIT_NICE
] = {"Max nice priority", NULL
},
443 [RLIMIT_RTPRIO
] = {"Max realtime priority", NULL
},
444 [RLIMIT_RTTIME
] = {"Max realtime timeout", "us"},
447 /* Display limits for a process */
448 static int proc_pid_limits(struct task_struct
*task
, char *buffer
)
453 char *bufptr
= buffer
;
455 struct rlimit rlim
[RLIM_NLIMITS
];
457 if (!lock_task_sighand(task
, &flags
))
459 memcpy(rlim
, task
->signal
->rlim
, sizeof(struct rlimit
) * RLIM_NLIMITS
);
460 unlock_task_sighand(task
, &flags
);
463 * print the file header
465 count
+= sprintf(&bufptr
[count
], "%-25s %-20s %-20s %-10s\n",
466 "Limit", "Soft Limit", "Hard Limit", "Units");
468 for (i
= 0; i
< RLIM_NLIMITS
; i
++) {
469 if (rlim
[i
].rlim_cur
== RLIM_INFINITY
)
470 count
+= sprintf(&bufptr
[count
], "%-25s %-20s ",
471 lnames
[i
].name
, "unlimited");
473 count
+= sprintf(&bufptr
[count
], "%-25s %-20lu ",
474 lnames
[i
].name
, rlim
[i
].rlim_cur
);
476 if (rlim
[i
].rlim_max
== RLIM_INFINITY
)
477 count
+= sprintf(&bufptr
[count
], "%-20s ", "unlimited");
479 count
+= sprintf(&bufptr
[count
], "%-20lu ",
483 count
+= sprintf(&bufptr
[count
], "%-10s\n",
486 count
+= sprintf(&bufptr
[count
], "\n");
492 #ifdef CONFIG_HAVE_ARCH_TRACEHOOK
493 static int proc_pid_syscall(struct task_struct
*task
, char *buffer
)
496 unsigned long args
[6], sp
, pc
;
497 int res
= lock_trace(task
);
501 if (task_current_syscall(task
, &nr
, args
, 6, &sp
, &pc
))
502 res
= sprintf(buffer
, "running\n");
504 res
= sprintf(buffer
, "%ld 0x%lx 0x%lx\n", nr
, sp
, pc
);
506 res
= sprintf(buffer
,
507 "%ld 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx\n",
509 args
[0], args
[1], args
[2], args
[3], args
[4], args
[5],
514 #endif /* CONFIG_HAVE_ARCH_TRACEHOOK */
516 /************************************************************************/
517 /* Here the fs part begins */
518 /************************************************************************/
520 /* permission checks */
521 static int proc_fd_access_allowed(struct inode
*inode
)
523 struct task_struct
*task
;
525 /* Allow access to a task's file descriptors if it is us or we
526 * may use ptrace attach to the process and find out that
529 task
= get_proc_task(inode
);
531 allowed
= ptrace_may_access(task
, PTRACE_MODE_READ
);
532 put_task_struct(task
);
537 int proc_setattr(struct dentry
*dentry
, struct iattr
*attr
)
540 struct inode
*inode
= dentry
->d_inode
;
542 if (attr
->ia_valid
& ATTR_MODE
)
545 error
= inode_change_ok(inode
, attr
);
549 if ((attr
->ia_valid
& ATTR_SIZE
) &&
550 attr
->ia_size
!= i_size_read(inode
)) {
551 error
= vmtruncate(inode
, attr
->ia_size
);
556 setattr_copy(inode
, attr
);
557 mark_inode_dirty(inode
);
562 * May current process learn task's sched/cmdline info (for hide_pid_min=1)
563 * or euid/egid (for hide_pid_min=2)?
565 static bool has_pid_permissions(struct pid_namespace
*pid
,
566 struct task_struct
*task
,
569 if (pid
->hide_pid
< hide_pid_min
)
571 if (in_group_p(pid
->pid_gid
))
573 return ptrace_may_access(task
, PTRACE_MODE_READ
);
577 static int proc_pid_permission(struct inode
*inode
, int mask
)
579 struct pid_namespace
*pid
= inode
->i_sb
->s_fs_info
;
580 struct task_struct
*task
;
583 task
= get_proc_task(inode
);
586 has_perms
= has_pid_permissions(pid
, task
, 1);
587 put_task_struct(task
);
590 if (pid
->hide_pid
== 2) {
592 * Let's make getdents(), stat(), and open()
593 * consistent with each other. If a process
594 * may not stat() a file, it shouldn't be seen
602 return generic_permission(inode
, mask
);
607 static const struct inode_operations proc_def_inode_operations
= {
608 .setattr
= proc_setattr
,
611 #define PROC_BLOCK_SIZE (3*1024) /* 4K page size but our output routines use some slack for overruns */
613 static ssize_t
proc_info_read(struct file
* file
, char __user
* buf
,
614 size_t count
, loff_t
*ppos
)
616 struct inode
* inode
= file
->f_path
.dentry
->d_inode
;
619 struct task_struct
*task
= get_proc_task(inode
);
625 if (count
> PROC_BLOCK_SIZE
)
626 count
= PROC_BLOCK_SIZE
;
629 if (!(page
= __get_free_page(GFP_TEMPORARY
)))
632 length
= PROC_I(inode
)->op
.proc_read(task
, (char*)page
);
635 length
= simple_read_from_buffer(buf
, count
, ppos
, (char *)page
, length
);
638 put_task_struct(task
);
643 static const struct file_operations proc_info_file_operations
= {
644 .read
= proc_info_read
,
645 .llseek
= generic_file_llseek
,
648 static int proc_single_show(struct seq_file
*m
, void *v
)
650 struct inode
*inode
= m
->private;
651 struct pid_namespace
*ns
;
653 struct task_struct
*task
;
656 ns
= inode
->i_sb
->s_fs_info
;
657 pid
= proc_pid(inode
);
658 task
= get_pid_task(pid
, PIDTYPE_PID
);
662 ret
= PROC_I(inode
)->op
.proc_show(m
, ns
, pid
, task
);
664 put_task_struct(task
);
668 static int proc_single_open(struct inode
*inode
, struct file
*filp
)
670 return single_open(filp
, proc_single_show
, inode
);
673 static const struct file_operations proc_single_file_operations
= {
674 .open
= proc_single_open
,
677 .release
= single_release
,
680 static int mem_open(struct inode
* inode
, struct file
* file
)
682 struct task_struct
*task
= get_proc_task(file
->f_path
.dentry
->d_inode
);
683 struct mm_struct
*mm
;
688 mm
= mm_access(task
, PTRACE_MODE_ATTACH
);
689 put_task_struct(task
);
695 /* ensure this mm_struct can't be freed */
696 atomic_inc(&mm
->mm_count
);
697 /* but do not pin its memory */
701 /* OK to pass negative loff_t, we can catch out-of-range */
702 file
->f_mode
|= FMODE_UNSIGNED_OFFSET
;
703 file
->private_data
= mm
;
708 static ssize_t
mem_rw(struct file
*file
, char __user
*buf
,
709 size_t count
, loff_t
*ppos
, int write
)
711 struct mm_struct
*mm
= file
->private_data
;
712 unsigned long addr
= *ppos
;
719 page
= (char *)__get_free_page(GFP_TEMPORARY
);
724 if (!atomic_inc_not_zero(&mm
->mm_users
))
728 int this_len
= min_t(int, count
, PAGE_SIZE
);
730 if (write
&& copy_from_user(page
, buf
, this_len
)) {
735 this_len
= access_remote_vm(mm
, addr
, page
, this_len
, write
);
742 if (!write
&& copy_to_user(buf
, page
, this_len
)) {
756 free_page((unsigned long) page
);
760 static ssize_t
mem_read(struct file
*file
, char __user
*buf
,
761 size_t count
, loff_t
*ppos
)
763 return mem_rw(file
, buf
, count
, ppos
, 0);
766 static ssize_t
mem_write(struct file
*file
, const char __user
*buf
,
767 size_t count
, loff_t
*ppos
)
769 return mem_rw(file
, (char __user
*)buf
, count
, ppos
, 1);
772 loff_t
mem_lseek(struct file
*file
, loff_t offset
, int orig
)
776 file
->f_pos
= offset
;
779 file
->f_pos
+= offset
;
784 force_successful_syscall_return();
788 static int mem_release(struct inode
*inode
, struct file
*file
)
790 struct mm_struct
*mm
= file
->private_data
;
796 static const struct file_operations proc_mem_operations
= {
801 .release
= mem_release
,
804 static ssize_t
environ_read(struct file
*file
, char __user
*buf
,
805 size_t count
, loff_t
*ppos
)
807 struct task_struct
*task
= get_proc_task(file
->f_dentry
->d_inode
);
809 unsigned long src
= *ppos
;
811 struct mm_struct
*mm
;
817 page
= (char *)__get_free_page(GFP_TEMPORARY
);
822 mm
= mm_for_maps(task
);
824 if (!mm
|| IS_ERR(mm
))
829 int this_len
, retval
, max_len
;
831 this_len
= mm
->env_end
- (mm
->env_start
+ src
);
836 max_len
= (count
> PAGE_SIZE
) ? PAGE_SIZE
: count
;
837 this_len
= (this_len
> max_len
) ? max_len
: this_len
;
839 retval
= access_process_vm(task
, (mm
->env_start
+ src
),
847 if (copy_to_user(buf
, page
, retval
)) {
861 free_page((unsigned long) page
);
863 put_task_struct(task
);
868 static const struct file_operations proc_environ_operations
= {
869 .read
= environ_read
,
870 .llseek
= generic_file_llseek
,
873 static ssize_t
oom_adjust_read(struct file
*file
, char __user
*buf
,
874 size_t count
, loff_t
*ppos
)
876 struct task_struct
*task
= get_proc_task(file
->f_path
.dentry
->d_inode
);
877 char buffer
[PROC_NUMBUF
];
879 int oom_adjust
= OOM_DISABLE
;
885 if (lock_task_sighand(task
, &flags
)) {
886 oom_adjust
= task
->signal
->oom_adj
;
887 unlock_task_sighand(task
, &flags
);
890 put_task_struct(task
);
892 len
= snprintf(buffer
, sizeof(buffer
), "%i\n", oom_adjust
);
894 return simple_read_from_buffer(buf
, count
, ppos
, buffer
, len
);
897 static ssize_t
oom_adjust_write(struct file
*file
, const char __user
*buf
,
898 size_t count
, loff_t
*ppos
)
900 struct task_struct
*task
;
901 char buffer
[PROC_NUMBUF
];
906 memset(buffer
, 0, sizeof(buffer
));
907 if (count
> sizeof(buffer
) - 1)
908 count
= sizeof(buffer
) - 1;
909 if (copy_from_user(buffer
, buf
, count
)) {
914 err
= kstrtoint(strstrip(buffer
), 0, &oom_adjust
);
917 if ((oom_adjust
< OOM_ADJUST_MIN
|| oom_adjust
> OOM_ADJUST_MAX
) &&
918 oom_adjust
!= OOM_DISABLE
) {
923 task
= get_proc_task(file
->f_path
.dentry
->d_inode
);
935 if (!lock_task_sighand(task
, &flags
)) {
940 if (oom_adjust
< task
->signal
->oom_adj
&& !capable(CAP_SYS_RESOURCE
)) {
946 * Warn that /proc/pid/oom_adj is deprecated, see
947 * Documentation/feature-removal-schedule.txt.
949 printk_once(KERN_WARNING
"%s (%d): /proc/%d/oom_adj is deprecated, please use /proc/%d/oom_score_adj instead.\n",
950 current
->comm
, task_pid_nr(current
), task_pid_nr(task
),
952 task
->signal
->oom_adj
= oom_adjust
;
954 * Scale /proc/pid/oom_score_adj appropriately ensuring that a maximum
955 * value is always attainable.
957 if (task
->signal
->oom_adj
== OOM_ADJUST_MAX
)
958 task
->signal
->oom_score_adj
= OOM_SCORE_ADJ_MAX
;
960 task
->signal
->oom_score_adj
= (oom_adjust
* OOM_SCORE_ADJ_MAX
) /
962 trace_oom_score_adj_update(task
);
964 unlock_task_sighand(task
, &flags
);
967 put_task_struct(task
);
969 return err
< 0 ? err
: count
;
972 static const struct file_operations proc_oom_adjust_operations
= {
973 .read
= oom_adjust_read
,
974 .write
= oom_adjust_write
,
975 .llseek
= generic_file_llseek
,
978 static ssize_t
oom_score_adj_read(struct file
*file
, char __user
*buf
,
979 size_t count
, loff_t
*ppos
)
981 struct task_struct
*task
= get_proc_task(file
->f_path
.dentry
->d_inode
);
982 char buffer
[PROC_NUMBUF
];
983 int oom_score_adj
= OOM_SCORE_ADJ_MIN
;
989 if (lock_task_sighand(task
, &flags
)) {
990 oom_score_adj
= task
->signal
->oom_score_adj
;
991 unlock_task_sighand(task
, &flags
);
993 put_task_struct(task
);
994 len
= snprintf(buffer
, sizeof(buffer
), "%d\n", oom_score_adj
);
995 return simple_read_from_buffer(buf
, count
, ppos
, buffer
, len
);
998 static ssize_t
oom_score_adj_write(struct file
*file
, const char __user
*buf
,
999 size_t count
, loff_t
*ppos
)
1001 struct task_struct
*task
;
1002 char buffer
[PROC_NUMBUF
];
1003 unsigned long flags
;
1007 memset(buffer
, 0, sizeof(buffer
));
1008 if (count
> sizeof(buffer
) - 1)
1009 count
= sizeof(buffer
) - 1;
1010 if (copy_from_user(buffer
, buf
, count
)) {
1015 err
= kstrtoint(strstrip(buffer
), 0, &oom_score_adj
);
1018 if (oom_score_adj
< OOM_SCORE_ADJ_MIN
||
1019 oom_score_adj
> OOM_SCORE_ADJ_MAX
) {
1024 task
= get_proc_task(file
->f_path
.dentry
->d_inode
);
1036 if (!lock_task_sighand(task
, &flags
)) {
1041 if (oom_score_adj
< task
->signal
->oom_score_adj_min
&&
1042 !capable(CAP_SYS_RESOURCE
)) {
1047 task
->signal
->oom_score_adj
= oom_score_adj
;
1048 if (has_capability_noaudit(current
, CAP_SYS_RESOURCE
))
1049 task
->signal
->oom_score_adj_min
= oom_score_adj
;
1050 trace_oom_score_adj_update(task
);
1052 * Scale /proc/pid/oom_adj appropriately ensuring that OOM_DISABLE is
1053 * always attainable.
1055 if (task
->signal
->oom_score_adj
== OOM_SCORE_ADJ_MIN
)
1056 task
->signal
->oom_adj
= OOM_DISABLE
;
1058 task
->signal
->oom_adj
= (oom_score_adj
* OOM_ADJUST_MAX
) /
1061 unlock_task_sighand(task
, &flags
);
1064 put_task_struct(task
);
1066 return err
< 0 ? err
: count
;
1069 static const struct file_operations proc_oom_score_adj_operations
= {
1070 .read
= oom_score_adj_read
,
1071 .write
= oom_score_adj_write
,
1072 .llseek
= default_llseek
,
1075 #ifdef CONFIG_AUDITSYSCALL
1076 #define TMPBUFLEN 21
1077 static ssize_t
proc_loginuid_read(struct file
* file
, char __user
* buf
,
1078 size_t count
, loff_t
*ppos
)
1080 struct inode
* inode
= file
->f_path
.dentry
->d_inode
;
1081 struct task_struct
*task
= get_proc_task(inode
);
1083 char tmpbuf
[TMPBUFLEN
];
1087 length
= scnprintf(tmpbuf
, TMPBUFLEN
, "%u",
1088 audit_get_loginuid(task
));
1089 put_task_struct(task
);
1090 return simple_read_from_buffer(buf
, count
, ppos
, tmpbuf
, length
);
1093 static ssize_t
proc_loginuid_write(struct file
* file
, const char __user
* buf
,
1094 size_t count
, loff_t
*ppos
)
1096 struct inode
* inode
= file
->f_path
.dentry
->d_inode
;
1102 if (current
!= pid_task(proc_pid(inode
), PIDTYPE_PID
)) {
1108 if (count
>= PAGE_SIZE
)
1109 count
= PAGE_SIZE
- 1;
1112 /* No partial writes. */
1115 page
= (char*)__get_free_page(GFP_TEMPORARY
);
1119 if (copy_from_user(page
, buf
, count
))
1123 loginuid
= simple_strtoul(page
, &tmp
, 10);
1129 length
= audit_set_loginuid(loginuid
);
1130 if (likely(length
== 0))
1134 free_page((unsigned long) page
);
1138 static const struct file_operations proc_loginuid_operations
= {
1139 .read
= proc_loginuid_read
,
1140 .write
= proc_loginuid_write
,
1141 .llseek
= generic_file_llseek
,
1144 static ssize_t
proc_sessionid_read(struct file
* file
, char __user
* buf
,
1145 size_t count
, loff_t
*ppos
)
1147 struct inode
* inode
= file
->f_path
.dentry
->d_inode
;
1148 struct task_struct
*task
= get_proc_task(inode
);
1150 char tmpbuf
[TMPBUFLEN
];
1154 length
= scnprintf(tmpbuf
, TMPBUFLEN
, "%u",
1155 audit_get_sessionid(task
));
1156 put_task_struct(task
);
1157 return simple_read_from_buffer(buf
, count
, ppos
, tmpbuf
, length
);
1160 static const struct file_operations proc_sessionid_operations
= {
1161 .read
= proc_sessionid_read
,
1162 .llseek
= generic_file_llseek
,
1166 #ifdef CONFIG_FAULT_INJECTION
1167 static ssize_t
proc_fault_inject_read(struct file
* file
, char __user
* buf
,
1168 size_t count
, loff_t
*ppos
)
1170 struct task_struct
*task
= get_proc_task(file
->f_dentry
->d_inode
);
1171 char buffer
[PROC_NUMBUF
];
1177 make_it_fail
= task
->make_it_fail
;
1178 put_task_struct(task
);
1180 len
= snprintf(buffer
, sizeof(buffer
), "%i\n", make_it_fail
);
1182 return simple_read_from_buffer(buf
, count
, ppos
, buffer
, len
);
1185 static ssize_t
proc_fault_inject_write(struct file
* file
,
1186 const char __user
* buf
, size_t count
, loff_t
*ppos
)
1188 struct task_struct
*task
;
1189 char buffer
[PROC_NUMBUF
], *end
;
1192 if (!capable(CAP_SYS_RESOURCE
))
1194 memset(buffer
, 0, sizeof(buffer
));
1195 if (count
> sizeof(buffer
) - 1)
1196 count
= sizeof(buffer
) - 1;
1197 if (copy_from_user(buffer
, buf
, count
))
1199 make_it_fail
= simple_strtol(strstrip(buffer
), &end
, 0);
1202 task
= get_proc_task(file
->f_dentry
->d_inode
);
1205 task
->make_it_fail
= make_it_fail
;
1206 put_task_struct(task
);
1211 static const struct file_operations proc_fault_inject_operations
= {
1212 .read
= proc_fault_inject_read
,
1213 .write
= proc_fault_inject_write
,
1214 .llseek
= generic_file_llseek
,
1219 #ifdef CONFIG_SCHED_DEBUG
1221 * Print out various scheduling related per-task fields:
1223 static int sched_show(struct seq_file
*m
, void *v
)
1225 struct inode
*inode
= m
->private;
1226 struct task_struct
*p
;
1228 p
= get_proc_task(inode
);
1231 proc_sched_show_task(p
, m
);
1239 sched_write(struct file
*file
, const char __user
*buf
,
1240 size_t count
, loff_t
*offset
)
1242 struct inode
*inode
= file
->f_path
.dentry
->d_inode
;
1243 struct task_struct
*p
;
1245 p
= get_proc_task(inode
);
1248 proc_sched_set_task(p
);
1255 static int sched_open(struct inode
*inode
, struct file
*filp
)
1257 return single_open(filp
, sched_show
, inode
);
1260 static const struct file_operations proc_pid_sched_operations
= {
1263 .write
= sched_write
,
1264 .llseek
= seq_lseek
,
1265 .release
= single_release
,
1270 #ifdef CONFIG_SCHED_AUTOGROUP
1272 * Print out autogroup related information:
1274 static int sched_autogroup_show(struct seq_file
*m
, void *v
)
1276 struct inode
*inode
= m
->private;
1277 struct task_struct
*p
;
1279 p
= get_proc_task(inode
);
1282 proc_sched_autogroup_show_task(p
, m
);
1290 sched_autogroup_write(struct file
*file
, const char __user
*buf
,
1291 size_t count
, loff_t
*offset
)
1293 struct inode
*inode
= file
->f_path
.dentry
->d_inode
;
1294 struct task_struct
*p
;
1295 char buffer
[PROC_NUMBUF
];
1299 memset(buffer
, 0, sizeof(buffer
));
1300 if (count
> sizeof(buffer
) - 1)
1301 count
= sizeof(buffer
) - 1;
1302 if (copy_from_user(buffer
, buf
, count
))
1305 err
= kstrtoint(strstrip(buffer
), 0, &nice
);
1309 p
= get_proc_task(inode
);
1314 err
= proc_sched_autogroup_set_nice(p
, &err
);
1323 static int sched_autogroup_open(struct inode
*inode
, struct file
*filp
)
1327 ret
= single_open(filp
, sched_autogroup_show
, NULL
);
1329 struct seq_file
*m
= filp
->private_data
;
1336 static const struct file_operations proc_pid_sched_autogroup_operations
= {
1337 .open
= sched_autogroup_open
,
1339 .write
= sched_autogroup_write
,
1340 .llseek
= seq_lseek
,
1341 .release
= single_release
,
1344 #endif /* CONFIG_SCHED_AUTOGROUP */
1346 static ssize_t
comm_write(struct file
*file
, const char __user
*buf
,
1347 size_t count
, loff_t
*offset
)
1349 struct inode
*inode
= file
->f_path
.dentry
->d_inode
;
1350 struct task_struct
*p
;
1351 char buffer
[TASK_COMM_LEN
];
1353 memset(buffer
, 0, sizeof(buffer
));
1354 if (count
> sizeof(buffer
) - 1)
1355 count
= sizeof(buffer
) - 1;
1356 if (copy_from_user(buffer
, buf
, count
))
1359 p
= get_proc_task(inode
);
1363 if (same_thread_group(current
, p
))
1364 set_task_comm(p
, buffer
);
1373 static int comm_show(struct seq_file
*m
, void *v
)
1375 struct inode
*inode
= m
->private;
1376 struct task_struct
*p
;
1378 p
= get_proc_task(inode
);
1383 seq_printf(m
, "%s\n", p
->comm
);
1391 static int comm_open(struct inode
*inode
, struct file
*filp
)
1393 return single_open(filp
, comm_show
, inode
);
1396 static const struct file_operations proc_pid_set_comm_operations
= {
1399 .write
= comm_write
,
1400 .llseek
= seq_lseek
,
1401 .release
= single_release
,
1404 static int proc_exe_link(struct dentry
*dentry
, struct path
*exe_path
)
1406 struct task_struct
*task
;
1407 struct mm_struct
*mm
;
1408 struct file
*exe_file
;
1410 task
= get_proc_task(dentry
->d_inode
);
1413 mm
= get_task_mm(task
);
1414 put_task_struct(task
);
1417 exe_file
= get_mm_exe_file(mm
);
1420 *exe_path
= exe_file
->f_path
;
1421 path_get(&exe_file
->f_path
);
1428 static void *proc_pid_follow_link(struct dentry
*dentry
, struct nameidata
*nd
)
1430 struct inode
*inode
= dentry
->d_inode
;
1431 int error
= -EACCES
;
1433 /* We don't need a base pointer in the /proc filesystem */
1434 path_put(&nd
->path
);
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
, &nd
->path
);
1442 return ERR_PTR(error
);
1445 static int do_proc_readlink(struct path
*path
, char __user
*buffer
, int buflen
)
1447 char *tmp
= (char*)__get_free_page(GFP_TEMPORARY
);
1454 pathname
= d_path(path
, tmp
, PAGE_SIZE
);
1455 len
= PTR_ERR(pathname
);
1456 if (IS_ERR(pathname
))
1458 len
= tmp
+ PAGE_SIZE
- 1 - pathname
;
1462 if (copy_to_user(buffer
, pathname
, len
))
1465 free_page((unsigned long)tmp
);
1469 static int proc_pid_readlink(struct dentry
* dentry
, char __user
* buffer
, int buflen
)
1471 int error
= -EACCES
;
1472 struct inode
*inode
= dentry
->d_inode
;
1475 /* Are we allowed to snoop on the tasks file descriptors? */
1476 if (!proc_fd_access_allowed(inode
))
1479 error
= PROC_I(inode
)->op
.proc_get_link(dentry
, &path
);
1483 error
= do_proc_readlink(&path
, buffer
, buflen
);
1489 static const struct inode_operations proc_pid_link_inode_operations
= {
1490 .readlink
= proc_pid_readlink
,
1491 .follow_link
= proc_pid_follow_link
,
1492 .setattr
= proc_setattr
,
1496 /* building an inode */
1498 static int task_dumpable(struct task_struct
*task
)
1501 struct mm_struct
*mm
;
1506 dumpable
= get_dumpable(mm
);
1513 struct inode
*proc_pid_make_inode(struct super_block
* sb
, struct task_struct
*task
)
1515 struct inode
* inode
;
1516 struct proc_inode
*ei
;
1517 const struct cred
*cred
;
1519 /* We need a new inode */
1521 inode
= new_inode(sb
);
1527 inode
->i_ino
= get_next_ino();
1528 inode
->i_mtime
= inode
->i_atime
= inode
->i_ctime
= CURRENT_TIME
;
1529 inode
->i_op
= &proc_def_inode_operations
;
1532 * grab the reference to task.
1534 ei
->pid
= get_task_pid(task
, PIDTYPE_PID
);
1538 if (task_dumpable(task
)) {
1540 cred
= __task_cred(task
);
1541 inode
->i_uid
= cred
->euid
;
1542 inode
->i_gid
= cred
->egid
;
1545 security_task_to_inode(task
, inode
);
1555 int pid_getattr(struct vfsmount
*mnt
, struct dentry
*dentry
, struct kstat
*stat
)
1557 struct inode
*inode
= dentry
->d_inode
;
1558 struct task_struct
*task
;
1559 const struct cred
*cred
;
1560 struct pid_namespace
*pid
= dentry
->d_sb
->s_fs_info
;
1562 generic_fillattr(inode
, stat
);
1567 task
= pid_task(proc_pid(inode
), PIDTYPE_PID
);
1569 if (!has_pid_permissions(pid
, task
, 2)) {
1572 * This doesn't prevent learning whether PID exists,
1573 * it only makes getattr() consistent with readdir().
1577 if ((inode
->i_mode
== (S_IFDIR
|S_IRUGO
|S_IXUGO
)) ||
1578 task_dumpable(task
)) {
1579 cred
= __task_cred(task
);
1580 stat
->uid
= cred
->euid
;
1581 stat
->gid
= cred
->egid
;
1591 * Exceptional case: normally we are not allowed to unhash a busy
1592 * directory. In this case, however, we can do it - no aliasing problems
1593 * due to the way we treat inodes.
1595 * Rewrite the inode's ownerships here because the owning task may have
1596 * performed a setuid(), etc.
1598 * Before the /proc/pid/status file was created the only way to read
1599 * the effective uid of a /process was to stat /proc/pid. Reading
1600 * /proc/pid/status is slow enough that procps and other packages
1601 * kept stating /proc/pid. To keep the rules in /proc simple I have
1602 * made this apply to all per process world readable and executable
1605 int pid_revalidate(struct dentry
*dentry
, struct nameidata
*nd
)
1607 struct inode
*inode
;
1608 struct task_struct
*task
;
1609 const struct cred
*cred
;
1611 if (nd
&& nd
->flags
& LOOKUP_RCU
)
1614 inode
= dentry
->d_inode
;
1615 task
= get_proc_task(inode
);
1618 if ((inode
->i_mode
== (S_IFDIR
|S_IRUGO
|S_IXUGO
)) ||
1619 task_dumpable(task
)) {
1621 cred
= __task_cred(task
);
1622 inode
->i_uid
= cred
->euid
;
1623 inode
->i_gid
= cred
->egid
;
1629 inode
->i_mode
&= ~(S_ISUID
| S_ISGID
);
1630 security_task_to_inode(task
, inode
);
1631 put_task_struct(task
);
1638 static int pid_delete_dentry(const struct dentry
* dentry
)
1640 /* Is the task we represent dead?
1641 * If so, then don't put the dentry on the lru list,
1642 * kill it immediately.
1644 return !proc_pid(dentry
->d_inode
)->tasks
[PIDTYPE_PID
].first
;
1647 const struct dentry_operations pid_dentry_operations
=
1649 .d_revalidate
= pid_revalidate
,
1650 .d_delete
= pid_delete_dentry
,
1656 * Fill a directory entry.
1658 * If possible create the dcache entry and derive our inode number and
1659 * file type from dcache entry.
1661 * Since all of the proc inode numbers are dynamically generated, the inode
1662 * numbers do not exist until the inode is cache. This means creating the
1663 * the dcache entry in readdir is necessary to keep the inode numbers
1664 * reported by readdir in sync with the inode numbers reported
1667 int proc_fill_cache(struct file
*filp
, void *dirent
, filldir_t filldir
,
1668 const char *name
, int len
,
1669 instantiate_t instantiate
, struct task_struct
*task
, const void *ptr
)
1671 struct dentry
*child
, *dir
= filp
->f_path
.dentry
;
1672 struct inode
*inode
;
1675 unsigned type
= DT_UNKNOWN
;
1679 qname
.hash
= full_name_hash(name
, len
);
1681 child
= d_lookup(dir
, &qname
);
1684 new = d_alloc(dir
, &qname
);
1686 child
= instantiate(dir
->d_inode
, new, task
, ptr
);
1693 if (!child
|| IS_ERR(child
) || !child
->d_inode
)
1694 goto end_instantiate
;
1695 inode
= child
->d_inode
;
1698 type
= inode
->i_mode
>> 12;
1703 ino
= find_inode_number(dir
, &qname
);
1706 return filldir(dirent
, name
, len
, filp
->f_pos
, ino
, type
);
1709 static unsigned name_to_int(struct dentry
*dentry
)
1711 const char *name
= dentry
->d_name
.name
;
1712 int len
= dentry
->d_name
.len
;
1715 if (len
> 1 && *name
== '0')
1718 unsigned c
= *name
++ - '0';
1721 if (n
>= (~0U-9)/10)
1731 #define PROC_FDINFO_MAX 64
1733 static int proc_fd_info(struct inode
*inode
, struct path
*path
, char *info
)
1735 struct task_struct
*task
= get_proc_task(inode
);
1736 struct files_struct
*files
= NULL
;
1738 int fd
= proc_fd(inode
);
1741 files
= get_files_struct(task
);
1742 put_task_struct(task
);
1746 * We are not taking a ref to the file structure, so we must
1749 spin_lock(&files
->file_lock
);
1750 file
= fcheck_files(files
, fd
);
1752 unsigned int f_flags
;
1753 struct fdtable
*fdt
;
1755 fdt
= files_fdtable(files
);
1756 f_flags
= file
->f_flags
& ~O_CLOEXEC
;
1757 if (close_on_exec(fd
, fdt
))
1758 f_flags
|= O_CLOEXEC
;
1761 *path
= file
->f_path
;
1762 path_get(&file
->f_path
);
1765 snprintf(info
, PROC_FDINFO_MAX
,
1768 (long long) file
->f_pos
,
1770 spin_unlock(&files
->file_lock
);
1771 put_files_struct(files
);
1774 spin_unlock(&files
->file_lock
);
1775 put_files_struct(files
);
1780 static int proc_fd_link(struct dentry
*dentry
, struct path
*path
)
1782 return proc_fd_info(dentry
->d_inode
, path
, NULL
);
1785 static int tid_fd_revalidate(struct dentry
*dentry
, struct nameidata
*nd
)
1787 struct inode
*inode
;
1788 struct task_struct
*task
;
1790 struct files_struct
*files
;
1791 const struct cred
*cred
;
1793 if (nd
&& nd
->flags
& LOOKUP_RCU
)
1796 inode
= dentry
->d_inode
;
1797 task
= get_proc_task(inode
);
1798 fd
= proc_fd(inode
);
1801 files
= get_files_struct(task
);
1804 if (fcheck_files(files
, fd
)) {
1806 put_files_struct(files
);
1807 if (task_dumpable(task
)) {
1809 cred
= __task_cred(task
);
1810 inode
->i_uid
= cred
->euid
;
1811 inode
->i_gid
= cred
->egid
;
1817 inode
->i_mode
&= ~(S_ISUID
| S_ISGID
);
1818 security_task_to_inode(task
, inode
);
1819 put_task_struct(task
);
1823 put_files_struct(files
);
1825 put_task_struct(task
);
1831 static const struct dentry_operations tid_fd_dentry_operations
=
1833 .d_revalidate
= tid_fd_revalidate
,
1834 .d_delete
= pid_delete_dentry
,
1837 static struct dentry
*proc_fd_instantiate(struct inode
*dir
,
1838 struct dentry
*dentry
, struct task_struct
*task
, const void *ptr
)
1840 unsigned fd
= *(const unsigned *)ptr
;
1842 struct files_struct
*files
;
1843 struct inode
*inode
;
1844 struct proc_inode
*ei
;
1845 struct dentry
*error
= ERR_PTR(-ENOENT
);
1847 inode
= proc_pid_make_inode(dir
->i_sb
, task
);
1852 files
= get_files_struct(task
);
1855 inode
->i_mode
= S_IFLNK
;
1858 * We are not taking a ref to the file structure, so we must
1861 spin_lock(&files
->file_lock
);
1862 file
= fcheck_files(files
, fd
);
1865 if (file
->f_mode
& FMODE_READ
)
1866 inode
->i_mode
|= S_IRUSR
| S_IXUSR
;
1867 if (file
->f_mode
& FMODE_WRITE
)
1868 inode
->i_mode
|= S_IWUSR
| S_IXUSR
;
1869 spin_unlock(&files
->file_lock
);
1870 put_files_struct(files
);
1872 inode
->i_op
= &proc_pid_link_inode_operations
;
1874 ei
->op
.proc_get_link
= proc_fd_link
;
1875 d_set_d_op(dentry
, &tid_fd_dentry_operations
);
1876 d_add(dentry
, inode
);
1877 /* Close the race of the process dying before we return the dentry */
1878 if (tid_fd_revalidate(dentry
, NULL
))
1884 spin_unlock(&files
->file_lock
);
1885 put_files_struct(files
);
1891 static struct dentry
*proc_lookupfd_common(struct inode
*dir
,
1892 struct dentry
*dentry
,
1893 instantiate_t instantiate
)
1895 struct task_struct
*task
= get_proc_task(dir
);
1896 unsigned fd
= name_to_int(dentry
);
1897 struct dentry
*result
= ERR_PTR(-ENOENT
);
1904 result
= instantiate(dir
, dentry
, task
, &fd
);
1906 put_task_struct(task
);
1911 static int proc_readfd_common(struct file
* filp
, void * dirent
,
1912 filldir_t filldir
, instantiate_t instantiate
)
1914 struct dentry
*dentry
= filp
->f_path
.dentry
;
1915 struct inode
*inode
= dentry
->d_inode
;
1916 struct task_struct
*p
= get_proc_task(inode
);
1917 unsigned int fd
, ino
;
1919 struct files_struct
* files
;
1929 if (filldir(dirent
, ".", 1, 0, inode
->i_ino
, DT_DIR
) < 0)
1933 ino
= parent_ino(dentry
);
1934 if (filldir(dirent
, "..", 2, 1, ino
, DT_DIR
) < 0)
1938 files
= get_files_struct(p
);
1942 for (fd
= filp
->f_pos
-2;
1943 fd
< files_fdtable(files
)->max_fds
;
1944 fd
++, filp
->f_pos
++) {
1945 char name
[PROC_NUMBUF
];
1948 if (!fcheck_files(files
, fd
))
1952 len
= snprintf(name
, sizeof(name
), "%d", fd
);
1953 if (proc_fill_cache(filp
, dirent
, filldir
,
1954 name
, len
, instantiate
,
1962 put_files_struct(files
);
1970 static struct dentry
*proc_lookupfd(struct inode
*dir
, struct dentry
*dentry
,
1971 struct nameidata
*nd
)
1973 return proc_lookupfd_common(dir
, dentry
, proc_fd_instantiate
);
1976 static int proc_readfd(struct file
*filp
, void *dirent
, filldir_t filldir
)
1978 return proc_readfd_common(filp
, dirent
, filldir
, proc_fd_instantiate
);
1981 static ssize_t
proc_fdinfo_read(struct file
*file
, char __user
*buf
,
1982 size_t len
, loff_t
*ppos
)
1984 char tmp
[PROC_FDINFO_MAX
];
1985 int err
= proc_fd_info(file
->f_path
.dentry
->d_inode
, NULL
, tmp
);
1987 err
= simple_read_from_buffer(buf
, len
, ppos
, tmp
, strlen(tmp
));
1991 static const struct file_operations proc_fdinfo_file_operations
= {
1992 .open
= nonseekable_open
,
1993 .read
= proc_fdinfo_read
,
1994 .llseek
= no_llseek
,
1997 static const struct file_operations proc_fd_operations
= {
1998 .read
= generic_read_dir
,
1999 .readdir
= proc_readfd
,
2000 .llseek
= default_llseek
,
2003 #ifdef CONFIG_CHECKPOINT_RESTORE
2006 * dname_to_vma_addr - maps a dentry name into two unsigned longs
2007 * which represent vma start and end addresses.
2009 static int dname_to_vma_addr(struct dentry
*dentry
,
2010 unsigned long *start
, unsigned long *end
)
2012 if (sscanf(dentry
->d_name
.name
, "%lx-%lx", start
, end
) != 2)
2018 static int map_files_d_revalidate(struct dentry
*dentry
, struct nameidata
*nd
)
2020 unsigned long vm_start
, vm_end
;
2021 bool exact_vma_exists
= false;
2022 struct mm_struct
*mm
= NULL
;
2023 struct task_struct
*task
;
2024 const struct cred
*cred
;
2025 struct inode
*inode
;
2028 if (nd
&& nd
->flags
& LOOKUP_RCU
)
2031 if (!capable(CAP_SYS_ADMIN
)) {
2036 inode
= dentry
->d_inode
;
2037 task
= get_proc_task(inode
);
2041 if (!ptrace_may_access(task
, PTRACE_MODE_READ
))
2044 mm
= get_task_mm(task
);
2048 if (!dname_to_vma_addr(dentry
, &vm_start
, &vm_end
)) {
2049 down_read(&mm
->mmap_sem
);
2050 exact_vma_exists
= !!find_exact_vma(mm
, vm_start
, vm_end
);
2051 up_read(&mm
->mmap_sem
);
2056 if (exact_vma_exists
) {
2057 if (task_dumpable(task
)) {
2059 cred
= __task_cred(task
);
2060 inode
->i_uid
= cred
->euid
;
2061 inode
->i_gid
= cred
->egid
;
2067 security_task_to_inode(task
, inode
);
2072 put_task_struct(task
);
2081 static const struct dentry_operations tid_map_files_dentry_operations
= {
2082 .d_revalidate
= map_files_d_revalidate
,
2083 .d_delete
= pid_delete_dentry
,
2086 static int proc_map_files_get_link(struct dentry
*dentry
, struct path
*path
)
2088 unsigned long vm_start
, vm_end
;
2089 struct vm_area_struct
*vma
;
2090 struct task_struct
*task
;
2091 struct mm_struct
*mm
;
2095 task
= get_proc_task(dentry
->d_inode
);
2099 mm
= get_task_mm(task
);
2100 put_task_struct(task
);
2104 rc
= dname_to_vma_addr(dentry
, &vm_start
, &vm_end
);
2108 down_read(&mm
->mmap_sem
);
2109 vma
= find_exact_vma(mm
, vm_start
, vm_end
);
2110 if (vma
&& vma
->vm_file
) {
2111 *path
= vma
->vm_file
->f_path
;
2115 up_read(&mm
->mmap_sem
);
2123 struct map_files_info
{
2126 unsigned char name
[4*sizeof(long)+2]; /* max: %lx-%lx\0 */
2129 static struct dentry
*
2130 proc_map_files_instantiate(struct inode
*dir
, struct dentry
*dentry
,
2131 struct task_struct
*task
, const void *ptr
)
2133 const struct file
*file
= ptr
;
2134 struct proc_inode
*ei
;
2135 struct inode
*inode
;
2138 return ERR_PTR(-ENOENT
);
2140 inode
= proc_pid_make_inode(dir
->i_sb
, task
);
2142 return ERR_PTR(-ENOENT
);
2145 ei
->op
.proc_get_link
= proc_map_files_get_link
;
2147 inode
->i_op
= &proc_pid_link_inode_operations
;
2149 inode
->i_mode
= S_IFLNK
;
2151 if (file
->f_mode
& FMODE_READ
)
2152 inode
->i_mode
|= S_IRUSR
;
2153 if (file
->f_mode
& FMODE_WRITE
)
2154 inode
->i_mode
|= S_IWUSR
;
2156 d_set_d_op(dentry
, &tid_map_files_dentry_operations
);
2157 d_add(dentry
, inode
);
2162 static struct dentry
*proc_map_files_lookup(struct inode
*dir
,
2163 struct dentry
*dentry
, struct nameidata
*nd
)
2165 unsigned long vm_start
, vm_end
;
2166 struct vm_area_struct
*vma
;
2167 struct task_struct
*task
;
2168 struct dentry
*result
;
2169 struct mm_struct
*mm
;
2171 result
= ERR_PTR(-EACCES
);
2172 if (!capable(CAP_SYS_ADMIN
))
2175 result
= ERR_PTR(-ENOENT
);
2176 task
= get_proc_task(dir
);
2180 result
= ERR_PTR(-EACCES
);
2181 if (lock_trace(task
))
2184 result
= ERR_PTR(-ENOENT
);
2185 if (dname_to_vma_addr(dentry
, &vm_start
, &vm_end
))
2188 mm
= get_task_mm(task
);
2192 down_read(&mm
->mmap_sem
);
2193 vma
= find_exact_vma(mm
, vm_start
, vm_end
);
2197 result
= proc_map_files_instantiate(dir
, dentry
, task
, vma
->vm_file
);
2200 up_read(&mm
->mmap_sem
);
2205 put_task_struct(task
);
2210 static const struct inode_operations proc_map_files_inode_operations
= {
2211 .lookup
= proc_map_files_lookup
,
2212 .permission
= proc_fd_permission
,
2213 .setattr
= proc_setattr
,
2217 proc_map_files_readdir(struct file
*filp
, void *dirent
, filldir_t filldir
)
2219 struct dentry
*dentry
= filp
->f_path
.dentry
;
2220 struct inode
*inode
= dentry
->d_inode
;
2221 struct vm_area_struct
*vma
;
2222 struct task_struct
*task
;
2223 struct mm_struct
*mm
;
2228 if (!capable(CAP_SYS_ADMIN
))
2232 task
= get_proc_task(inode
);
2237 if (lock_trace(task
))
2241 switch (filp
->f_pos
) {
2244 if (filldir(dirent
, ".", 1, 0, ino
, DT_DIR
) < 0)
2248 ino
= parent_ino(dentry
);
2249 if (filldir(dirent
, "..", 2, 1, ino
, DT_DIR
) < 0)
2254 unsigned long nr_files
, pos
, i
;
2255 struct flex_array
*fa
= NULL
;
2256 struct map_files_info info
;
2257 struct map_files_info
*p
;
2259 mm
= get_task_mm(task
);
2262 down_read(&mm
->mmap_sem
);
2267 * We need two passes here:
2269 * 1) Collect vmas of mapped files with mmap_sem taken
2270 * 2) Release mmap_sem and instantiate entries
2272 * otherwise we get lockdep complained, since filldir()
2273 * routine might require mmap_sem taken in might_fault().
2276 for (vma
= mm
->mmap
, pos
= 2; vma
; vma
= vma
->vm_next
) {
2277 if (vma
->vm_file
&& ++pos
> filp
->f_pos
)
2282 fa
= flex_array_alloc(sizeof(info
), nr_files
,
2284 if (!fa
|| flex_array_prealloc(fa
, 0, nr_files
,
2288 flex_array_free(fa
);
2289 up_read(&mm
->mmap_sem
);
2293 for (i
= 0, vma
= mm
->mmap
, pos
= 2; vma
;
2294 vma
= vma
->vm_next
) {
2297 if (++pos
<= filp
->f_pos
)
2300 get_file(vma
->vm_file
);
2301 info
.file
= vma
->vm_file
;
2302 info
.len
= snprintf(info
.name
,
2303 sizeof(info
.name
), "%lx-%lx",
2304 vma
->vm_start
, vma
->vm_end
);
2305 if (flex_array_put(fa
, i
++, &info
, GFP_KERNEL
))
2309 up_read(&mm
->mmap_sem
);
2311 for (i
= 0; i
< nr_files
; i
++) {
2312 p
= flex_array_get(fa
, i
);
2313 ret
= proc_fill_cache(filp
, dirent
, filldir
,
2315 proc_map_files_instantiate
,
2322 for (; i
< nr_files
; i
++) {
2324 * In case of error don't forget
2325 * to put rest of file refs.
2327 p
= flex_array_get(fa
, i
);
2331 flex_array_free(fa
);
2339 put_task_struct(task
);
2344 static const struct file_operations proc_map_files_operations
= {
2345 .read
= generic_read_dir
,
2346 .readdir
= proc_map_files_readdir
,
2347 .llseek
= default_llseek
,
2350 #endif /* CONFIG_CHECKPOINT_RESTORE */
2353 * /proc/pid/fd needs a special permission handler so that a process can still
2354 * access /proc/self/fd after it has executed a setuid().
2356 static int proc_fd_permission(struct inode
*inode
, int mask
)
2358 int rv
= generic_permission(inode
, mask
);
2361 if (task_pid(current
) == proc_pid(inode
))
2367 * proc directories can do almost nothing..
2369 static const struct inode_operations proc_fd_inode_operations
= {
2370 .lookup
= proc_lookupfd
,
2371 .permission
= proc_fd_permission
,
2372 .setattr
= proc_setattr
,
2375 static struct dentry
*proc_fdinfo_instantiate(struct inode
*dir
,
2376 struct dentry
*dentry
, struct task_struct
*task
, const void *ptr
)
2378 unsigned fd
= *(unsigned *)ptr
;
2379 struct inode
*inode
;
2380 struct proc_inode
*ei
;
2381 struct dentry
*error
= ERR_PTR(-ENOENT
);
2383 inode
= proc_pid_make_inode(dir
->i_sb
, task
);
2388 inode
->i_mode
= S_IFREG
| S_IRUSR
;
2389 inode
->i_fop
= &proc_fdinfo_file_operations
;
2390 d_set_d_op(dentry
, &tid_fd_dentry_operations
);
2391 d_add(dentry
, inode
);
2392 /* Close the race of the process dying before we return the dentry */
2393 if (tid_fd_revalidate(dentry
, NULL
))
2400 static struct dentry
*proc_lookupfdinfo(struct inode
*dir
,
2401 struct dentry
*dentry
,
2402 struct nameidata
*nd
)
2404 return proc_lookupfd_common(dir
, dentry
, proc_fdinfo_instantiate
);
2407 static int proc_readfdinfo(struct file
*filp
, void *dirent
, filldir_t filldir
)
2409 return proc_readfd_common(filp
, dirent
, filldir
,
2410 proc_fdinfo_instantiate
);
2413 static const struct file_operations proc_fdinfo_operations
= {
2414 .read
= generic_read_dir
,
2415 .readdir
= proc_readfdinfo
,
2416 .llseek
= default_llseek
,
2420 * proc directories can do almost nothing..
2422 static const struct inode_operations proc_fdinfo_inode_operations
= {
2423 .lookup
= proc_lookupfdinfo
,
2424 .setattr
= proc_setattr
,
2428 static struct dentry
*proc_pident_instantiate(struct inode
*dir
,
2429 struct dentry
*dentry
, struct task_struct
*task
, const void *ptr
)
2431 const struct pid_entry
*p
= ptr
;
2432 struct inode
*inode
;
2433 struct proc_inode
*ei
;
2434 struct dentry
*error
= ERR_PTR(-ENOENT
);
2436 inode
= proc_pid_make_inode(dir
->i_sb
, task
);
2441 inode
->i_mode
= p
->mode
;
2442 if (S_ISDIR(inode
->i_mode
))
2443 set_nlink(inode
, 2); /* Use getattr to fix if necessary */
2445 inode
->i_op
= p
->iop
;
2447 inode
->i_fop
= p
->fop
;
2449 d_set_d_op(dentry
, &pid_dentry_operations
);
2450 d_add(dentry
, inode
);
2451 /* Close the race of the process dying before we return the dentry */
2452 if (pid_revalidate(dentry
, NULL
))
2458 static struct dentry
*proc_pident_lookup(struct inode
*dir
,
2459 struct dentry
*dentry
,
2460 const struct pid_entry
*ents
,
2463 struct dentry
*error
;
2464 struct task_struct
*task
= get_proc_task(dir
);
2465 const struct pid_entry
*p
, *last
;
2467 error
= ERR_PTR(-ENOENT
);
2473 * Yes, it does not scale. And it should not. Don't add
2474 * new entries into /proc/<tgid>/ without very good reasons.
2476 last
= &ents
[nents
- 1];
2477 for (p
= ents
; p
<= last
; p
++) {
2478 if (p
->len
!= dentry
->d_name
.len
)
2480 if (!memcmp(dentry
->d_name
.name
, p
->name
, p
->len
))
2486 error
= proc_pident_instantiate(dir
, dentry
, task
, p
);
2488 put_task_struct(task
);
2493 static int proc_pident_fill_cache(struct file
*filp
, void *dirent
,
2494 filldir_t filldir
, struct task_struct
*task
, const struct pid_entry
*p
)
2496 return proc_fill_cache(filp
, dirent
, filldir
, p
->name
, p
->len
,
2497 proc_pident_instantiate
, task
, p
);
2500 static int proc_pident_readdir(struct file
*filp
,
2501 void *dirent
, filldir_t filldir
,
2502 const struct pid_entry
*ents
, unsigned int nents
)
2505 struct dentry
*dentry
= filp
->f_path
.dentry
;
2506 struct inode
*inode
= dentry
->d_inode
;
2507 struct task_struct
*task
= get_proc_task(inode
);
2508 const struct pid_entry
*p
, *last
;
2521 if (filldir(dirent
, ".", 1, i
, ino
, DT_DIR
) < 0)
2527 ino
= parent_ino(dentry
);
2528 if (filldir(dirent
, "..", 2, i
, ino
, DT_DIR
) < 0)
2540 last
= &ents
[nents
- 1];
2542 if (proc_pident_fill_cache(filp
, dirent
, filldir
, task
, p
) < 0)
2551 put_task_struct(task
);
2556 #ifdef CONFIG_SECURITY
2557 static ssize_t
proc_pid_attr_read(struct file
* file
, char __user
* buf
,
2558 size_t count
, loff_t
*ppos
)
2560 struct inode
* inode
= file
->f_path
.dentry
->d_inode
;
2563 struct task_struct
*task
= get_proc_task(inode
);
2568 length
= security_getprocattr(task
,
2569 (char*)file
->f_path
.dentry
->d_name
.name
,
2571 put_task_struct(task
);
2573 length
= simple_read_from_buffer(buf
, count
, ppos
, p
, length
);
2578 static ssize_t
proc_pid_attr_write(struct file
* file
, const char __user
* buf
,
2579 size_t count
, loff_t
*ppos
)
2581 struct inode
* inode
= file
->f_path
.dentry
->d_inode
;
2584 struct task_struct
*task
= get_proc_task(inode
);
2589 if (count
> PAGE_SIZE
)
2592 /* No partial writes. */
2598 page
= (char*)__get_free_page(GFP_TEMPORARY
);
2603 if (copy_from_user(page
, buf
, count
))
2606 /* Guard against adverse ptrace interaction */
2607 length
= mutex_lock_interruptible(&task
->signal
->cred_guard_mutex
);
2611 length
= security_setprocattr(task
,
2612 (char*)file
->f_path
.dentry
->d_name
.name
,
2613 (void*)page
, count
);
2614 mutex_unlock(&task
->signal
->cred_guard_mutex
);
2616 free_page((unsigned long) page
);
2618 put_task_struct(task
);
2623 static const struct file_operations proc_pid_attr_operations
= {
2624 .read
= proc_pid_attr_read
,
2625 .write
= proc_pid_attr_write
,
2626 .llseek
= generic_file_llseek
,
2629 static const struct pid_entry attr_dir_stuff
[] = {
2630 REG("current", S_IRUGO
|S_IWUGO
, proc_pid_attr_operations
),
2631 REG("prev", S_IRUGO
, proc_pid_attr_operations
),
2632 REG("exec", S_IRUGO
|S_IWUGO
, proc_pid_attr_operations
),
2633 REG("fscreate", S_IRUGO
|S_IWUGO
, proc_pid_attr_operations
),
2634 REG("keycreate", S_IRUGO
|S_IWUGO
, proc_pid_attr_operations
),
2635 REG("sockcreate", S_IRUGO
|S_IWUGO
, proc_pid_attr_operations
),
2638 static int proc_attr_dir_readdir(struct file
* filp
,
2639 void * dirent
, filldir_t filldir
)
2641 return proc_pident_readdir(filp
,dirent
,filldir
,
2642 attr_dir_stuff
,ARRAY_SIZE(attr_dir_stuff
));
2645 static const struct file_operations proc_attr_dir_operations
= {
2646 .read
= generic_read_dir
,
2647 .readdir
= proc_attr_dir_readdir
,
2648 .llseek
= default_llseek
,
2651 static struct dentry
*proc_attr_dir_lookup(struct inode
*dir
,
2652 struct dentry
*dentry
, struct nameidata
*nd
)
2654 return proc_pident_lookup(dir
, dentry
,
2655 attr_dir_stuff
, ARRAY_SIZE(attr_dir_stuff
));
2658 static const struct inode_operations proc_attr_dir_inode_operations
= {
2659 .lookup
= proc_attr_dir_lookup
,
2660 .getattr
= pid_getattr
,
2661 .setattr
= proc_setattr
,
2666 #ifdef CONFIG_ELF_CORE
2667 static ssize_t
proc_coredump_filter_read(struct file
*file
, char __user
*buf
,
2668 size_t count
, loff_t
*ppos
)
2670 struct task_struct
*task
= get_proc_task(file
->f_dentry
->d_inode
);
2671 struct mm_struct
*mm
;
2672 char buffer
[PROC_NUMBUF
];
2680 mm
= get_task_mm(task
);
2682 len
= snprintf(buffer
, sizeof(buffer
), "%08lx\n",
2683 ((mm
->flags
& MMF_DUMP_FILTER_MASK
) >>
2684 MMF_DUMP_FILTER_SHIFT
));
2686 ret
= simple_read_from_buffer(buf
, count
, ppos
, buffer
, len
);
2689 put_task_struct(task
);
2694 static ssize_t
proc_coredump_filter_write(struct file
*file
,
2695 const char __user
*buf
,
2699 struct task_struct
*task
;
2700 struct mm_struct
*mm
;
2701 char buffer
[PROC_NUMBUF
], *end
;
2708 memset(buffer
, 0, sizeof(buffer
));
2709 if (count
> sizeof(buffer
) - 1)
2710 count
= sizeof(buffer
) - 1;
2711 if (copy_from_user(buffer
, buf
, count
))
2715 val
= (unsigned int)simple_strtoul(buffer
, &end
, 0);
2718 if (end
- buffer
== 0)
2722 task
= get_proc_task(file
->f_dentry
->d_inode
);
2727 mm
= get_task_mm(task
);
2731 for (i
= 0, mask
= 1; i
< MMF_DUMP_FILTER_BITS
; i
++, mask
<<= 1) {
2733 set_bit(i
+ MMF_DUMP_FILTER_SHIFT
, &mm
->flags
);
2735 clear_bit(i
+ MMF_DUMP_FILTER_SHIFT
, &mm
->flags
);
2740 put_task_struct(task
);
2745 static const struct file_operations proc_coredump_filter_operations
= {
2746 .read
= proc_coredump_filter_read
,
2747 .write
= proc_coredump_filter_write
,
2748 .llseek
= generic_file_llseek
,
2755 static int proc_self_readlink(struct dentry
*dentry
, char __user
*buffer
,
2758 struct pid_namespace
*ns
= dentry
->d_sb
->s_fs_info
;
2759 pid_t tgid
= task_tgid_nr_ns(current
, ns
);
2760 char tmp
[PROC_NUMBUF
];
2763 sprintf(tmp
, "%d", tgid
);
2764 return vfs_readlink(dentry
,buffer
,buflen
,tmp
);
2767 static void *proc_self_follow_link(struct dentry
*dentry
, struct nameidata
*nd
)
2769 struct pid_namespace
*ns
= dentry
->d_sb
->s_fs_info
;
2770 pid_t tgid
= task_tgid_nr_ns(current
, ns
);
2771 char *name
= ERR_PTR(-ENOENT
);
2775 name
= ERR_PTR(-ENOMEM
);
2777 sprintf(name
, "%d", tgid
);
2779 nd_set_link(nd
, name
);
2783 static void proc_self_put_link(struct dentry
*dentry
, struct nameidata
*nd
,
2786 char *s
= nd_get_link(nd
);
2791 static const struct inode_operations proc_self_inode_operations
= {
2792 .readlink
= proc_self_readlink
,
2793 .follow_link
= proc_self_follow_link
,
2794 .put_link
= proc_self_put_link
,
2800 * These are the directory entries in the root directory of /proc
2801 * that properly belong to the /proc filesystem, as they describe
2802 * describe something that is process related.
2804 static const struct pid_entry proc_base_stuff
[] = {
2805 NOD("self", S_IFLNK
|S_IRWXUGO
,
2806 &proc_self_inode_operations
, NULL
, {}),
2809 static struct dentry
*proc_base_instantiate(struct inode
*dir
,
2810 struct dentry
*dentry
, struct task_struct
*task
, const void *ptr
)
2812 const struct pid_entry
*p
= ptr
;
2813 struct inode
*inode
;
2814 struct proc_inode
*ei
;
2815 struct dentry
*error
;
2817 /* Allocate the inode */
2818 error
= ERR_PTR(-ENOMEM
);
2819 inode
= new_inode(dir
->i_sb
);
2823 /* Initialize the inode */
2825 inode
->i_ino
= get_next_ino();
2826 inode
->i_mtime
= inode
->i_atime
= inode
->i_ctime
= CURRENT_TIME
;
2829 * grab the reference to the task.
2831 ei
->pid
= get_task_pid(task
, PIDTYPE_PID
);
2835 inode
->i_mode
= p
->mode
;
2836 if (S_ISDIR(inode
->i_mode
))
2837 set_nlink(inode
, 2);
2838 if (S_ISLNK(inode
->i_mode
))
2841 inode
->i_op
= p
->iop
;
2843 inode
->i_fop
= p
->fop
;
2845 d_add(dentry
, inode
);
2854 static struct dentry
*proc_base_lookup(struct inode
*dir
, struct dentry
*dentry
)
2856 struct dentry
*error
;
2857 struct task_struct
*task
= get_proc_task(dir
);
2858 const struct pid_entry
*p
, *last
;
2860 error
= ERR_PTR(-ENOENT
);
2865 /* Lookup the directory entry */
2866 last
= &proc_base_stuff
[ARRAY_SIZE(proc_base_stuff
) - 1];
2867 for (p
= proc_base_stuff
; p
<= last
; p
++) {
2868 if (p
->len
!= dentry
->d_name
.len
)
2870 if (!memcmp(dentry
->d_name
.name
, p
->name
, p
->len
))
2876 error
= proc_base_instantiate(dir
, dentry
, task
, p
);
2879 put_task_struct(task
);
2884 static int proc_base_fill_cache(struct file
*filp
, void *dirent
,
2885 filldir_t filldir
, struct task_struct
*task
, const struct pid_entry
*p
)
2887 return proc_fill_cache(filp
, dirent
, filldir
, p
->name
, p
->len
,
2888 proc_base_instantiate
, task
, p
);
2891 #ifdef CONFIG_TASK_IO_ACCOUNTING
2892 static int do_io_accounting(struct task_struct
*task
, char *buffer
, int whole
)
2894 struct task_io_accounting acct
= task
->ioac
;
2895 unsigned long flags
;
2898 result
= mutex_lock_killable(&task
->signal
->cred_guard_mutex
);
2902 if (!ptrace_may_access(task
, PTRACE_MODE_READ
)) {
2907 if (whole
&& lock_task_sighand(task
, &flags
)) {
2908 struct task_struct
*t
= task
;
2910 task_io_accounting_add(&acct
, &task
->signal
->ioac
);
2911 while_each_thread(task
, t
)
2912 task_io_accounting_add(&acct
, &t
->ioac
);
2914 unlock_task_sighand(task
, &flags
);
2916 result
= sprintf(buffer
,
2921 "read_bytes: %llu\n"
2922 "write_bytes: %llu\n"
2923 "cancelled_write_bytes: %llu\n",
2924 (unsigned long long)acct
.rchar
,
2925 (unsigned long long)acct
.wchar
,
2926 (unsigned long long)acct
.syscr
,
2927 (unsigned long long)acct
.syscw
,
2928 (unsigned long long)acct
.read_bytes
,
2929 (unsigned long long)acct
.write_bytes
,
2930 (unsigned long long)acct
.cancelled_write_bytes
);
2932 mutex_unlock(&task
->signal
->cred_guard_mutex
);
2936 static int proc_tid_io_accounting(struct task_struct
*task
, char *buffer
)
2938 return do_io_accounting(task
, buffer
, 0);
2941 static int proc_tgid_io_accounting(struct task_struct
*task
, char *buffer
)
2943 return do_io_accounting(task
, buffer
, 1);
2945 #endif /* CONFIG_TASK_IO_ACCOUNTING */
2947 static int proc_pid_personality(struct seq_file
*m
, struct pid_namespace
*ns
,
2948 struct pid
*pid
, struct task_struct
*task
)
2950 int err
= lock_trace(task
);
2952 seq_printf(m
, "%08x\n", task
->personality
);
2961 static const struct file_operations proc_task_operations
;
2962 static const struct inode_operations proc_task_inode_operations
;
2964 static const struct pid_entry tgid_base_stuff
[] = {
2965 DIR("task", S_IRUGO
|S_IXUGO
, proc_task_inode_operations
, proc_task_operations
),
2966 DIR("fd", S_IRUSR
|S_IXUSR
, proc_fd_inode_operations
, proc_fd_operations
),
2967 #ifdef CONFIG_CHECKPOINT_RESTORE
2968 DIR("map_files", S_IRUSR
|S_IXUSR
, proc_map_files_inode_operations
, proc_map_files_operations
),
2970 DIR("fdinfo", S_IRUSR
|S_IXUSR
, proc_fdinfo_inode_operations
, proc_fdinfo_operations
),
2971 DIR("ns", S_IRUSR
|S_IXUGO
, proc_ns_dir_inode_operations
, proc_ns_dir_operations
),
2973 DIR("net", S_IRUGO
|S_IXUGO
, proc_net_inode_operations
, proc_net_operations
),
2975 REG("environ", S_IRUSR
, proc_environ_operations
),
2976 INF("auxv", S_IRUSR
, proc_pid_auxv
),
2977 ONE("status", S_IRUGO
, proc_pid_status
),
2978 ONE("personality", S_IRUGO
, proc_pid_personality
),
2979 INF("limits", S_IRUGO
, proc_pid_limits
),
2980 #ifdef CONFIG_SCHED_DEBUG
2981 REG("sched", S_IRUGO
|S_IWUSR
, proc_pid_sched_operations
),
2983 #ifdef CONFIG_SCHED_AUTOGROUP
2984 REG("autogroup", S_IRUGO
|S_IWUSR
, proc_pid_sched_autogroup_operations
),
2986 REG("comm", S_IRUGO
|S_IWUSR
, proc_pid_set_comm_operations
),
2987 #ifdef CONFIG_HAVE_ARCH_TRACEHOOK
2988 INF("syscall", S_IRUGO
, proc_pid_syscall
),
2990 INF("cmdline", S_IRUGO
, proc_pid_cmdline
),
2991 ONE("stat", S_IRUGO
, proc_tgid_stat
),
2992 ONE("statm", S_IRUGO
, proc_pid_statm
),
2993 REG("maps", S_IRUGO
, proc_maps_operations
),
2995 REG("numa_maps", S_IRUGO
, proc_numa_maps_operations
),
2997 REG("mem", S_IRUSR
|S_IWUSR
, proc_mem_operations
),
2998 LNK("cwd", proc_cwd_link
),
2999 LNK("root", proc_root_link
),
3000 LNK("exe", proc_exe_link
),
3001 REG("mounts", S_IRUGO
, proc_mounts_operations
),
3002 REG("mountinfo", S_IRUGO
, proc_mountinfo_operations
),
3003 REG("mountstats", S_IRUSR
, proc_mountstats_operations
),
3004 #ifdef CONFIG_PROC_PAGE_MONITOR
3005 REG("clear_refs", S_IWUSR
, proc_clear_refs_operations
),
3006 REG("smaps", S_IRUGO
, proc_smaps_operations
),
3007 REG("pagemap", S_IRUGO
, proc_pagemap_operations
),
3009 #ifdef CONFIG_SECURITY
3010 DIR("attr", S_IRUGO
|S_IXUGO
, proc_attr_dir_inode_operations
, proc_attr_dir_operations
),
3012 #ifdef CONFIG_KALLSYMS
3013 INF("wchan", S_IRUGO
, proc_pid_wchan
),
3015 #ifdef CONFIG_STACKTRACE
3016 ONE("stack", S_IRUGO
, proc_pid_stack
),
3018 #ifdef CONFIG_SCHEDSTATS
3019 INF("schedstat", S_IRUGO
, proc_pid_schedstat
),
3021 #ifdef CONFIG_LATENCYTOP
3022 REG("latency", S_IRUGO
, proc_lstats_operations
),
3024 #ifdef CONFIG_PROC_PID_CPUSET
3025 REG("cpuset", S_IRUGO
, proc_cpuset_operations
),
3027 #ifdef CONFIG_CGROUPS
3028 REG("cgroup", S_IRUGO
, proc_cgroup_operations
),
3030 INF("oom_score", S_IRUGO
, proc_oom_score
),
3031 REG("oom_adj", S_IRUGO
|S_IWUSR
, proc_oom_adjust_operations
),
3032 REG("oom_score_adj", S_IRUGO
|S_IWUSR
, proc_oom_score_adj_operations
),
3033 #ifdef CONFIG_AUDITSYSCALL
3034 REG("loginuid", S_IWUSR
|S_IRUGO
, proc_loginuid_operations
),
3035 REG("sessionid", S_IRUGO
, proc_sessionid_operations
),
3037 #ifdef CONFIG_FAULT_INJECTION
3038 REG("make-it-fail", S_IRUGO
|S_IWUSR
, proc_fault_inject_operations
),
3040 #ifdef CONFIG_ELF_CORE
3041 REG("coredump_filter", S_IRUGO
|S_IWUSR
, proc_coredump_filter_operations
),
3043 #ifdef CONFIG_TASK_IO_ACCOUNTING
3044 INF("io", S_IRUSR
, proc_tgid_io_accounting
),
3046 #ifdef CONFIG_HARDWALL
3047 INF("hardwall", S_IRUGO
, proc_pid_hardwall
),
3051 static int proc_tgid_base_readdir(struct file
* filp
,
3052 void * dirent
, filldir_t filldir
)
3054 return proc_pident_readdir(filp
,dirent
,filldir
,
3055 tgid_base_stuff
,ARRAY_SIZE(tgid_base_stuff
));
3058 static const struct file_operations proc_tgid_base_operations
= {
3059 .read
= generic_read_dir
,
3060 .readdir
= proc_tgid_base_readdir
,
3061 .llseek
= default_llseek
,
3064 static struct dentry
*proc_tgid_base_lookup(struct inode
*dir
, struct dentry
*dentry
, struct nameidata
*nd
){
3065 return proc_pident_lookup(dir
, dentry
,
3066 tgid_base_stuff
, ARRAY_SIZE(tgid_base_stuff
));
3069 static const struct inode_operations proc_tgid_base_inode_operations
= {
3070 .lookup
= proc_tgid_base_lookup
,
3071 .getattr
= pid_getattr
,
3072 .setattr
= proc_setattr
,
3073 .permission
= proc_pid_permission
,
3076 static void proc_flush_task_mnt(struct vfsmount
*mnt
, pid_t pid
, pid_t tgid
)
3078 struct dentry
*dentry
, *leader
, *dir
;
3079 char buf
[PROC_NUMBUF
];
3083 name
.len
= snprintf(buf
, sizeof(buf
), "%d", pid
);
3084 dentry
= d_hash_and_lookup(mnt
->mnt_root
, &name
);
3086 shrink_dcache_parent(dentry
);
3092 name
.len
= snprintf(buf
, sizeof(buf
), "%d", tgid
);
3093 leader
= d_hash_and_lookup(mnt
->mnt_root
, &name
);
3098 name
.len
= strlen(name
.name
);
3099 dir
= d_hash_and_lookup(leader
, &name
);
3101 goto out_put_leader
;
3104 name
.len
= snprintf(buf
, sizeof(buf
), "%d", pid
);
3105 dentry
= d_hash_and_lookup(dir
, &name
);
3107 shrink_dcache_parent(dentry
);
3120 * proc_flush_task - Remove dcache entries for @task from the /proc dcache.
3121 * @task: task that should be flushed.
3123 * When flushing dentries from proc, one needs to flush them from global
3124 * proc (proc_mnt) and from all the namespaces' procs this task was seen
3125 * in. This call is supposed to do all of this job.
3127 * Looks in the dcache for
3129 * /proc/@tgid/task/@pid
3130 * if either directory is present flushes it and all of it'ts children
3133 * It is safe and reasonable to cache /proc entries for a task until
3134 * that task exits. After that they just clog up the dcache with
3135 * useless entries, possibly causing useful dcache entries to be
3136 * flushed instead. This routine is proved to flush those useless
3137 * dcache entries at process exit time.
3139 * NOTE: This routine is just an optimization so it does not guarantee
3140 * that no dcache entries will exist at process exit time it
3141 * just makes it very unlikely that any will persist.
3144 void proc_flush_task(struct task_struct
*task
)
3147 struct pid
*pid
, *tgid
;
3150 pid
= task_pid(task
);
3151 tgid
= task_tgid(task
);
3153 for (i
= 0; i
<= pid
->level
; i
++) {
3154 upid
= &pid
->numbers
[i
];
3155 proc_flush_task_mnt(upid
->ns
->proc_mnt
, upid
->nr
,
3156 tgid
->numbers
[i
].nr
);
3159 upid
= &pid
->numbers
[pid
->level
];
3161 pid_ns_release_proc(upid
->ns
);
3164 static struct dentry
*proc_pid_instantiate(struct inode
*dir
,
3165 struct dentry
* dentry
,
3166 struct task_struct
*task
, const void *ptr
)
3168 struct dentry
*error
= ERR_PTR(-ENOENT
);
3169 struct inode
*inode
;
3171 inode
= proc_pid_make_inode(dir
->i_sb
, task
);
3175 inode
->i_mode
= S_IFDIR
|S_IRUGO
|S_IXUGO
;
3176 inode
->i_op
= &proc_tgid_base_inode_operations
;
3177 inode
->i_fop
= &proc_tgid_base_operations
;
3178 inode
->i_flags
|=S_IMMUTABLE
;
3180 set_nlink(inode
, 2 + pid_entry_count_dirs(tgid_base_stuff
,
3181 ARRAY_SIZE(tgid_base_stuff
)));
3183 d_set_d_op(dentry
, &pid_dentry_operations
);
3185 d_add(dentry
, inode
);
3186 /* Close the race of the process dying before we return the dentry */
3187 if (pid_revalidate(dentry
, NULL
))
3193 struct dentry
*proc_pid_lookup(struct inode
*dir
, struct dentry
* dentry
, struct nameidata
*nd
)
3195 struct dentry
*result
;
3196 struct task_struct
*task
;
3198 struct pid_namespace
*ns
;
3200 result
= proc_base_lookup(dir
, dentry
);
3201 if (!IS_ERR(result
) || PTR_ERR(result
) != -ENOENT
)
3204 tgid
= name_to_int(dentry
);
3208 ns
= dentry
->d_sb
->s_fs_info
;
3210 task
= find_task_by_pid_ns(tgid
, ns
);
3212 get_task_struct(task
);
3217 result
= proc_pid_instantiate(dir
, dentry
, task
, NULL
);
3218 put_task_struct(task
);
3224 * Find the first task with tgid >= tgid
3229 struct task_struct
*task
;
3231 static struct tgid_iter
next_tgid(struct pid_namespace
*ns
, struct tgid_iter iter
)
3236 put_task_struct(iter
.task
);
3240 pid
= find_ge_pid(iter
.tgid
, ns
);
3242 iter
.tgid
= pid_nr_ns(pid
, ns
);
3243 iter
.task
= pid_task(pid
, PIDTYPE_PID
);
3244 /* What we to know is if the pid we have find is the
3245 * pid of a thread_group_leader. Testing for task
3246 * being a thread_group_leader is the obvious thing
3247 * todo but there is a window when it fails, due to
3248 * the pid transfer logic in de_thread.
3250 * So we perform the straight forward test of seeing
3251 * if the pid we have found is the pid of a thread
3252 * group leader, and don't worry if the task we have
3253 * found doesn't happen to be a thread group leader.
3254 * As we don't care in the case of readdir.
3256 if (!iter
.task
|| !has_group_leader_pid(iter
.task
)) {
3260 get_task_struct(iter
.task
);
3266 #define TGID_OFFSET (FIRST_PROCESS_ENTRY + ARRAY_SIZE(proc_base_stuff))
3268 static int proc_pid_fill_cache(struct file
*filp
, void *dirent
, filldir_t filldir
,
3269 struct tgid_iter iter
)
3271 char name
[PROC_NUMBUF
];
3272 int len
= snprintf(name
, sizeof(name
), "%d", iter
.tgid
);
3273 return proc_fill_cache(filp
, dirent
, filldir
, name
, len
,
3274 proc_pid_instantiate
, iter
.task
, NULL
);
3277 static int fake_filldir(void *buf
, const char *name
, int namelen
,
3278 loff_t offset
, u64 ino
, unsigned d_type
)
3283 /* for the /proc/ directory itself, after non-process stuff has been done */
3284 int proc_pid_readdir(struct file
* filp
, void * dirent
, filldir_t filldir
)
3287 struct task_struct
*reaper
;
3288 struct tgid_iter iter
;
3289 struct pid_namespace
*ns
;
3290 filldir_t __filldir
;
3292 if (filp
->f_pos
>= PID_MAX_LIMIT
+ TGID_OFFSET
)
3294 nr
= filp
->f_pos
- FIRST_PROCESS_ENTRY
;
3296 reaper
= get_proc_task(filp
->f_path
.dentry
->d_inode
);
3300 for (; nr
< ARRAY_SIZE(proc_base_stuff
); filp
->f_pos
++, nr
++) {
3301 const struct pid_entry
*p
= &proc_base_stuff
[nr
];
3302 if (proc_base_fill_cache(filp
, dirent
, filldir
, reaper
, p
) < 0)
3306 ns
= filp
->f_dentry
->d_sb
->s_fs_info
;
3308 iter
.tgid
= filp
->f_pos
- TGID_OFFSET
;
3309 for (iter
= next_tgid(ns
, iter
);
3311 iter
.tgid
+= 1, iter
= next_tgid(ns
, iter
)) {
3312 if (has_pid_permissions(ns
, iter
.task
, 2))
3313 __filldir
= filldir
;
3315 __filldir
= fake_filldir
;
3317 filp
->f_pos
= iter
.tgid
+ TGID_OFFSET
;
3318 if (proc_pid_fill_cache(filp
, dirent
, __filldir
, iter
) < 0) {
3319 put_task_struct(iter
.task
);
3323 filp
->f_pos
= PID_MAX_LIMIT
+ TGID_OFFSET
;
3325 put_task_struct(reaper
);
3333 static const struct pid_entry tid_base_stuff
[] = {
3334 DIR("fd", S_IRUSR
|S_IXUSR
, proc_fd_inode_operations
, proc_fd_operations
),
3335 DIR("fdinfo", S_IRUSR
|S_IXUSR
, proc_fdinfo_inode_operations
, proc_fdinfo_operations
),
3336 DIR("ns", S_IRUSR
|S_IXUGO
, proc_ns_dir_inode_operations
, proc_ns_dir_operations
),
3337 REG("environ", S_IRUSR
, proc_environ_operations
),
3338 INF("auxv", S_IRUSR
, proc_pid_auxv
),
3339 ONE("status", S_IRUGO
, proc_pid_status
),
3340 ONE("personality", S_IRUGO
, proc_pid_personality
),
3341 INF("limits", S_IRUGO
, proc_pid_limits
),
3342 #ifdef CONFIG_SCHED_DEBUG
3343 REG("sched", S_IRUGO
|S_IWUSR
, proc_pid_sched_operations
),
3345 REG("comm", S_IRUGO
|S_IWUSR
, proc_pid_set_comm_operations
),
3346 #ifdef CONFIG_HAVE_ARCH_TRACEHOOK
3347 INF("syscall", S_IRUGO
, proc_pid_syscall
),
3349 INF("cmdline", S_IRUGO
, proc_pid_cmdline
),
3350 ONE("stat", S_IRUGO
, proc_tid_stat
),
3351 ONE("statm", S_IRUGO
, proc_pid_statm
),
3352 REG("maps", S_IRUGO
, proc_maps_operations
),
3354 REG("numa_maps", S_IRUGO
, proc_numa_maps_operations
),
3356 REG("mem", S_IRUSR
|S_IWUSR
, proc_mem_operations
),
3357 LNK("cwd", proc_cwd_link
),
3358 LNK("root", proc_root_link
),
3359 LNK("exe", proc_exe_link
),
3360 REG("mounts", S_IRUGO
, proc_mounts_operations
),
3361 REG("mountinfo", S_IRUGO
, proc_mountinfo_operations
),
3362 #ifdef CONFIG_PROC_PAGE_MONITOR
3363 REG("clear_refs", S_IWUSR
, proc_clear_refs_operations
),
3364 REG("smaps", S_IRUGO
, proc_smaps_operations
),
3365 REG("pagemap", S_IRUGO
, proc_pagemap_operations
),
3367 #ifdef CONFIG_SECURITY
3368 DIR("attr", S_IRUGO
|S_IXUGO
, proc_attr_dir_inode_operations
, proc_attr_dir_operations
),
3370 #ifdef CONFIG_KALLSYMS
3371 INF("wchan", S_IRUGO
, proc_pid_wchan
),
3373 #ifdef CONFIG_STACKTRACE
3374 ONE("stack", S_IRUGO
, proc_pid_stack
),
3376 #ifdef CONFIG_SCHEDSTATS
3377 INF("schedstat", S_IRUGO
, proc_pid_schedstat
),
3379 #ifdef CONFIG_LATENCYTOP
3380 REG("latency", S_IRUGO
, proc_lstats_operations
),
3382 #ifdef CONFIG_PROC_PID_CPUSET
3383 REG("cpuset", S_IRUGO
, proc_cpuset_operations
),
3385 #ifdef CONFIG_CGROUPS
3386 REG("cgroup", S_IRUGO
, proc_cgroup_operations
),
3388 INF("oom_score", S_IRUGO
, proc_oom_score
),
3389 REG("oom_adj", S_IRUGO
|S_IWUSR
, proc_oom_adjust_operations
),
3390 REG("oom_score_adj", S_IRUGO
|S_IWUSR
, proc_oom_score_adj_operations
),
3391 #ifdef CONFIG_AUDITSYSCALL
3392 REG("loginuid", S_IWUSR
|S_IRUGO
, proc_loginuid_operations
),
3393 REG("sessionid", S_IRUGO
, proc_sessionid_operations
),
3395 #ifdef CONFIG_FAULT_INJECTION
3396 REG("make-it-fail", S_IRUGO
|S_IWUSR
, proc_fault_inject_operations
),
3398 #ifdef CONFIG_TASK_IO_ACCOUNTING
3399 INF("io", S_IRUSR
, proc_tid_io_accounting
),
3401 #ifdef CONFIG_HARDWALL
3402 INF("hardwall", S_IRUGO
, proc_pid_hardwall
),
3406 static int proc_tid_base_readdir(struct file
* filp
,
3407 void * dirent
, filldir_t filldir
)
3409 return proc_pident_readdir(filp
,dirent
,filldir
,
3410 tid_base_stuff
,ARRAY_SIZE(tid_base_stuff
));
3413 static struct dentry
*proc_tid_base_lookup(struct inode
*dir
, struct dentry
*dentry
, struct nameidata
*nd
){
3414 return proc_pident_lookup(dir
, dentry
,
3415 tid_base_stuff
, ARRAY_SIZE(tid_base_stuff
));
3418 static const struct file_operations proc_tid_base_operations
= {
3419 .read
= generic_read_dir
,
3420 .readdir
= proc_tid_base_readdir
,
3421 .llseek
= default_llseek
,
3424 static const struct inode_operations proc_tid_base_inode_operations
= {
3425 .lookup
= proc_tid_base_lookup
,
3426 .getattr
= pid_getattr
,
3427 .setattr
= proc_setattr
,
3430 static struct dentry
*proc_task_instantiate(struct inode
*dir
,
3431 struct dentry
*dentry
, struct task_struct
*task
, const void *ptr
)
3433 struct dentry
*error
= ERR_PTR(-ENOENT
);
3434 struct inode
*inode
;
3435 inode
= proc_pid_make_inode(dir
->i_sb
, task
);
3439 inode
->i_mode
= S_IFDIR
|S_IRUGO
|S_IXUGO
;
3440 inode
->i_op
= &proc_tid_base_inode_operations
;
3441 inode
->i_fop
= &proc_tid_base_operations
;
3442 inode
->i_flags
|=S_IMMUTABLE
;
3444 set_nlink(inode
, 2 + pid_entry_count_dirs(tid_base_stuff
,
3445 ARRAY_SIZE(tid_base_stuff
)));
3447 d_set_d_op(dentry
, &pid_dentry_operations
);
3449 d_add(dentry
, inode
);
3450 /* Close the race of the process dying before we return the dentry */
3451 if (pid_revalidate(dentry
, NULL
))
3457 static struct dentry
*proc_task_lookup(struct inode
*dir
, struct dentry
* dentry
, struct nameidata
*nd
)
3459 struct dentry
*result
= ERR_PTR(-ENOENT
);
3460 struct task_struct
*task
;
3461 struct task_struct
*leader
= get_proc_task(dir
);
3463 struct pid_namespace
*ns
;
3468 tid
= name_to_int(dentry
);
3472 ns
= dentry
->d_sb
->s_fs_info
;
3474 task
= find_task_by_pid_ns(tid
, ns
);
3476 get_task_struct(task
);
3480 if (!same_thread_group(leader
, task
))
3483 result
= proc_task_instantiate(dir
, dentry
, task
, NULL
);
3485 put_task_struct(task
);
3487 put_task_struct(leader
);
3493 * Find the first tid of a thread group to return to user space.
3495 * Usually this is just the thread group leader, but if the users
3496 * buffer was too small or there was a seek into the middle of the
3497 * directory we have more work todo.
3499 * In the case of a short read we start with find_task_by_pid.
3501 * In the case of a seek we start with the leader and walk nr
3504 static struct task_struct
*first_tid(struct task_struct
*leader
,
3505 int tid
, int nr
, struct pid_namespace
*ns
)
3507 struct task_struct
*pos
;
3510 /* Attempt to start with the pid of a thread */
3511 if (tid
&& (nr
> 0)) {
3512 pos
= find_task_by_pid_ns(tid
, ns
);
3513 if (pos
&& (pos
->group_leader
== leader
))
3517 /* If nr exceeds the number of threads there is nothing todo */
3519 if (nr
&& nr
>= get_nr_threads(leader
))
3522 /* If we haven't found our starting place yet start
3523 * with the leader and walk nr threads forward.
3525 for (pos
= leader
; nr
> 0; --nr
) {
3526 pos
= next_thread(pos
);
3527 if (pos
== leader
) {
3533 get_task_struct(pos
);
3540 * Find the next thread in the thread list.
3541 * Return NULL if there is an error or no next thread.
3543 * The reference to the input task_struct is released.
3545 static struct task_struct
*next_tid(struct task_struct
*start
)
3547 struct task_struct
*pos
= NULL
;
3549 if (pid_alive(start
)) {
3550 pos
= next_thread(start
);
3551 if (thread_group_leader(pos
))
3554 get_task_struct(pos
);
3557 put_task_struct(start
);
3561 static int proc_task_fill_cache(struct file
*filp
, void *dirent
, filldir_t filldir
,
3562 struct task_struct
*task
, int tid
)
3564 char name
[PROC_NUMBUF
];
3565 int len
= snprintf(name
, sizeof(name
), "%d", tid
);
3566 return proc_fill_cache(filp
, dirent
, filldir
, name
, len
,
3567 proc_task_instantiate
, task
, NULL
);
3570 /* for the /proc/TGID/task/ directories */
3571 static int proc_task_readdir(struct file
* filp
, void * dirent
, filldir_t filldir
)
3573 struct dentry
*dentry
= filp
->f_path
.dentry
;
3574 struct inode
*inode
= dentry
->d_inode
;
3575 struct task_struct
*leader
= NULL
;
3576 struct task_struct
*task
;
3577 int retval
= -ENOENT
;
3580 struct pid_namespace
*ns
;
3582 task
= get_proc_task(inode
);
3586 if (pid_alive(task
)) {
3587 leader
= task
->group_leader
;
3588 get_task_struct(leader
);
3591 put_task_struct(task
);
3596 switch ((unsigned long)filp
->f_pos
) {
3599 if (filldir(dirent
, ".", 1, filp
->f_pos
, ino
, DT_DIR
) < 0)
3604 ino
= parent_ino(dentry
);
3605 if (filldir(dirent
, "..", 2, filp
->f_pos
, ino
, DT_DIR
) < 0)
3611 /* f_version caches the tgid value that the last readdir call couldn't
3612 * return. lseek aka telldir automagically resets f_version to 0.
3614 ns
= filp
->f_dentry
->d_sb
->s_fs_info
;
3615 tid
= (int)filp
->f_version
;
3616 filp
->f_version
= 0;
3617 for (task
= first_tid(leader
, tid
, filp
->f_pos
- 2, ns
);
3619 task
= next_tid(task
), filp
->f_pos
++) {
3620 tid
= task_pid_nr_ns(task
, ns
);
3621 if (proc_task_fill_cache(filp
, dirent
, filldir
, task
, tid
) < 0) {
3622 /* returning this tgid failed, save it as the first
3623 * pid for the next readir call */
3624 filp
->f_version
= (u64
)tid
;
3625 put_task_struct(task
);
3630 put_task_struct(leader
);
3635 static int proc_task_getattr(struct vfsmount
*mnt
, struct dentry
*dentry
, struct kstat
*stat
)
3637 struct inode
*inode
= dentry
->d_inode
;
3638 struct task_struct
*p
= get_proc_task(inode
);
3639 generic_fillattr(inode
, stat
);
3642 stat
->nlink
+= get_nr_threads(p
);
3649 static const struct inode_operations proc_task_inode_operations
= {
3650 .lookup
= proc_task_lookup
,
3651 .getattr
= proc_task_getattr
,
3652 .setattr
= proc_setattr
,
3653 .permission
= proc_pid_permission
,
3656 static const struct file_operations proc_task_operations
= {
3657 .read
= generic_read_dir
,
3658 .readdir
= proc_task_readdir
,
3659 .llseek
= default_llseek
,