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 #ifdef CONFIG_HARDWALL
87 #include <asm/hardwall.h>
92 * Implementing inode permission operations in /proc is almost
93 * certainly an error. Permission checks need to happen during
94 * each system call not at open time. The reason is that most of
95 * what we wish to check for permissions in /proc varies at runtime.
97 * The classic example of a problem is opening file descriptors
98 * in /proc for a task before it execs a suid executable.
105 const struct inode_operations
*iop
;
106 const struct file_operations
*fop
;
110 #define NOD(NAME, MODE, IOP, FOP, OP) { \
112 .len = sizeof(NAME) - 1, \
119 #define DIR(NAME, MODE, iops, fops) \
120 NOD(NAME, (S_IFDIR|(MODE)), &iops, &fops, {} )
121 #define LNK(NAME, get_link) \
122 NOD(NAME, (S_IFLNK|S_IRWXUGO), \
123 &proc_pid_link_inode_operations, NULL, \
124 { .proc_get_link = get_link } )
125 #define REG(NAME, MODE, fops) \
126 NOD(NAME, (S_IFREG|(MODE)), NULL, &fops, {})
127 #define INF(NAME, MODE, read) \
128 NOD(NAME, (S_IFREG|(MODE)), \
129 NULL, &proc_info_file_operations, \
130 { .proc_read = read } )
131 #define ONE(NAME, MODE, show) \
132 NOD(NAME, (S_IFREG|(MODE)), \
133 NULL, &proc_single_file_operations, \
134 { .proc_show = show } )
137 * Count the number of hardlinks for the pid_entry table, excluding the .
140 static unsigned int pid_entry_count_dirs(const struct pid_entry
*entries
,
147 for (i
= 0; i
< n
; ++i
) {
148 if (S_ISDIR(entries
[i
].mode
))
155 static int get_task_root(struct task_struct
*task
, struct path
*root
)
157 int result
= -ENOENT
;
161 get_fs_root(task
->fs
, root
);
168 static int proc_cwd_link(struct inode
*inode
, struct path
*path
)
170 struct task_struct
*task
= get_proc_task(inode
);
171 int result
= -ENOENT
;
176 get_fs_pwd(task
->fs
, path
);
180 put_task_struct(task
);
185 static int proc_root_link(struct inode
*inode
, struct path
*path
)
187 struct task_struct
*task
= get_proc_task(inode
);
188 int result
= -ENOENT
;
191 result
= get_task_root(task
, path
);
192 put_task_struct(task
);
197 static struct mm_struct
*__check_mem_permission(struct task_struct
*task
)
199 struct mm_struct
*mm
;
201 mm
= get_task_mm(task
);
203 return ERR_PTR(-EINVAL
);
206 * A task can always look at itself, in case it chooses
207 * to use system calls instead of load instructions.
213 * If current is actively ptrace'ing, and would also be
214 * permitted to freshly attach with ptrace now, permit it.
216 if (task_is_stopped_or_traced(task
)) {
219 match
= (ptrace_parent(task
) == current
);
221 if (match
&& ptrace_may_access(task
, PTRACE_MODE_ATTACH
))
226 * No one else is allowed.
229 return ERR_PTR(-EPERM
);
233 * If current may access user memory in @task return a reference to the
234 * corresponding mm, otherwise ERR_PTR.
236 static struct mm_struct
*check_mem_permission(struct task_struct
*task
)
238 struct mm_struct
*mm
;
242 * Avoid racing if task exec's as we might get a new mm but validate
243 * against old credentials.
245 err
= mutex_lock_killable(&task
->signal
->cred_guard_mutex
);
249 mm
= __check_mem_permission(task
);
250 mutex_unlock(&task
->signal
->cred_guard_mutex
);
255 struct mm_struct
*mm_for_maps(struct task_struct
*task
)
257 struct mm_struct
*mm
;
260 err
= mutex_lock_killable(&task
->signal
->cred_guard_mutex
);
264 mm
= get_task_mm(task
);
265 if (mm
&& mm
!= current
->mm
&&
266 !ptrace_may_access(task
, PTRACE_MODE_READ
)) {
268 mm
= ERR_PTR(-EACCES
);
270 mutex_unlock(&task
->signal
->cred_guard_mutex
);
275 static int proc_pid_cmdline(struct task_struct
*task
, char * buffer
)
279 struct mm_struct
*mm
= get_task_mm(task
);
283 goto out_mm
; /* Shh! No looking before we're done */
285 len
= mm
->arg_end
- mm
->arg_start
;
290 res
= access_process_vm(task
, mm
->arg_start
, buffer
, len
, 0);
292 // If the nul at the end of args has been overwritten, then
293 // assume application is using setproctitle(3).
294 if (res
> 0 && buffer
[res
-1] != '\0' && len
< PAGE_SIZE
) {
295 len
= strnlen(buffer
, res
);
299 len
= mm
->env_end
- mm
->env_start
;
300 if (len
> PAGE_SIZE
- res
)
301 len
= PAGE_SIZE
- res
;
302 res
+= access_process_vm(task
, mm
->env_start
, buffer
+res
, len
, 0);
303 res
= strnlen(buffer
, res
);
312 static int proc_pid_auxv(struct task_struct
*task
, char *buffer
)
314 struct mm_struct
*mm
= mm_for_maps(task
);
315 int res
= PTR_ERR(mm
);
316 if (mm
&& !IS_ERR(mm
)) {
317 unsigned int nwords
= 0;
320 } while (mm
->saved_auxv
[nwords
- 2] != 0); /* AT_NULL */
321 res
= nwords
* sizeof(mm
->saved_auxv
[0]);
324 memcpy(buffer
, mm
->saved_auxv
, res
);
331 #ifdef CONFIG_KALLSYMS
333 * Provides a wchan file via kallsyms in a proper one-value-per-file format.
334 * Returns the resolved symbol. If that fails, simply return the address.
336 static int proc_pid_wchan(struct task_struct
*task
, char *buffer
)
339 char symname
[KSYM_NAME_LEN
];
341 wchan
= get_wchan(task
);
343 if (lookup_symbol_name(wchan
, symname
) < 0)
344 if (!ptrace_may_access(task
, PTRACE_MODE_READ
))
347 return sprintf(buffer
, "%lu", wchan
);
349 return sprintf(buffer
, "%s", symname
);
351 #endif /* CONFIG_KALLSYMS */
353 static int lock_trace(struct task_struct
*task
)
355 int err
= mutex_lock_killable(&task
->signal
->cred_guard_mutex
);
358 if (!ptrace_may_access(task
, PTRACE_MODE_ATTACH
)) {
359 mutex_unlock(&task
->signal
->cred_guard_mutex
);
365 static void unlock_trace(struct task_struct
*task
)
367 mutex_unlock(&task
->signal
->cred_guard_mutex
);
370 #ifdef CONFIG_STACKTRACE
372 #define MAX_STACK_TRACE_DEPTH 64
374 static int proc_pid_stack(struct seq_file
*m
, struct pid_namespace
*ns
,
375 struct pid
*pid
, struct task_struct
*task
)
377 struct stack_trace trace
;
378 unsigned long *entries
;
382 entries
= kmalloc(MAX_STACK_TRACE_DEPTH
* sizeof(*entries
), GFP_KERNEL
);
386 trace
.nr_entries
= 0;
387 trace
.max_entries
= MAX_STACK_TRACE_DEPTH
;
388 trace
.entries
= entries
;
391 err
= lock_trace(task
);
393 save_stack_trace_tsk(task
, &trace
);
395 for (i
= 0; i
< trace
.nr_entries
; i
++) {
396 seq_printf(m
, "[<%pK>] %pS\n",
397 (void *)entries
[i
], (void *)entries
[i
]);
407 #ifdef CONFIG_SCHEDSTATS
409 * Provides /proc/PID/schedstat
411 static int proc_pid_schedstat(struct task_struct
*task
, char *buffer
)
413 return sprintf(buffer
, "%llu %llu %lu\n",
414 (unsigned long long)task
->se
.sum_exec_runtime
,
415 (unsigned long long)task
->sched_info
.run_delay
,
416 task
->sched_info
.pcount
);
420 #ifdef CONFIG_LATENCYTOP
421 static int lstats_show_proc(struct seq_file
*m
, void *v
)
424 struct inode
*inode
= m
->private;
425 struct task_struct
*task
= get_proc_task(inode
);
429 seq_puts(m
, "Latency Top version : v0.1\n");
430 for (i
= 0; i
< 32; i
++) {
431 struct latency_record
*lr
= &task
->latency_record
[i
];
432 if (lr
->backtrace
[0]) {
434 seq_printf(m
, "%i %li %li",
435 lr
->count
, lr
->time
, lr
->max
);
436 for (q
= 0; q
< LT_BACKTRACEDEPTH
; q
++) {
437 unsigned long bt
= lr
->backtrace
[q
];
442 seq_printf(m
, " %ps", (void *)bt
);
448 put_task_struct(task
);
452 static int lstats_open(struct inode
*inode
, struct file
*file
)
454 return single_open(file
, lstats_show_proc
, inode
);
457 static ssize_t
lstats_write(struct file
*file
, const char __user
*buf
,
458 size_t count
, loff_t
*offs
)
460 struct task_struct
*task
= get_proc_task(file
->f_dentry
->d_inode
);
464 clear_all_latency_tracing(task
);
465 put_task_struct(task
);
470 static const struct file_operations proc_lstats_operations
= {
473 .write
= lstats_write
,
475 .release
= single_release
,
480 static int proc_oom_score(struct task_struct
*task
, char *buffer
)
482 unsigned long points
= 0;
484 read_lock(&tasklist_lock
);
486 points
= oom_badness(task
, NULL
, NULL
,
487 totalram_pages
+ total_swap_pages
);
488 read_unlock(&tasklist_lock
);
489 return sprintf(buffer
, "%lu\n", points
);
497 static const struct limit_names lnames
[RLIM_NLIMITS
] = {
498 [RLIMIT_CPU
] = {"Max cpu time", "seconds"},
499 [RLIMIT_FSIZE
] = {"Max file size", "bytes"},
500 [RLIMIT_DATA
] = {"Max data size", "bytes"},
501 [RLIMIT_STACK
] = {"Max stack size", "bytes"},
502 [RLIMIT_CORE
] = {"Max core file size", "bytes"},
503 [RLIMIT_RSS
] = {"Max resident set", "bytes"},
504 [RLIMIT_NPROC
] = {"Max processes", "processes"},
505 [RLIMIT_NOFILE
] = {"Max open files", "files"},
506 [RLIMIT_MEMLOCK
] = {"Max locked memory", "bytes"},
507 [RLIMIT_AS
] = {"Max address space", "bytes"},
508 [RLIMIT_LOCKS
] = {"Max file locks", "locks"},
509 [RLIMIT_SIGPENDING
] = {"Max pending signals", "signals"},
510 [RLIMIT_MSGQUEUE
] = {"Max msgqueue size", "bytes"},
511 [RLIMIT_NICE
] = {"Max nice priority", NULL
},
512 [RLIMIT_RTPRIO
] = {"Max realtime priority", NULL
},
513 [RLIMIT_RTTIME
] = {"Max realtime timeout", "us"},
516 /* Display limits for a process */
517 static int proc_pid_limits(struct task_struct
*task
, char *buffer
)
522 char *bufptr
= buffer
;
524 struct rlimit rlim
[RLIM_NLIMITS
];
526 if (!lock_task_sighand(task
, &flags
))
528 memcpy(rlim
, task
->signal
->rlim
, sizeof(struct rlimit
) * RLIM_NLIMITS
);
529 unlock_task_sighand(task
, &flags
);
532 * print the file header
534 count
+= sprintf(&bufptr
[count
], "%-25s %-20s %-20s %-10s\n",
535 "Limit", "Soft Limit", "Hard Limit", "Units");
537 for (i
= 0; i
< RLIM_NLIMITS
; i
++) {
538 if (rlim
[i
].rlim_cur
== RLIM_INFINITY
)
539 count
+= sprintf(&bufptr
[count
], "%-25s %-20s ",
540 lnames
[i
].name
, "unlimited");
542 count
+= sprintf(&bufptr
[count
], "%-25s %-20lu ",
543 lnames
[i
].name
, rlim
[i
].rlim_cur
);
545 if (rlim
[i
].rlim_max
== RLIM_INFINITY
)
546 count
+= sprintf(&bufptr
[count
], "%-20s ", "unlimited");
548 count
+= sprintf(&bufptr
[count
], "%-20lu ",
552 count
+= sprintf(&bufptr
[count
], "%-10s\n",
555 count
+= sprintf(&bufptr
[count
], "\n");
561 #ifdef CONFIG_HAVE_ARCH_TRACEHOOK
562 static int proc_pid_syscall(struct task_struct
*task
, char *buffer
)
565 unsigned long args
[6], sp
, pc
;
566 int res
= lock_trace(task
);
570 if (task_current_syscall(task
, &nr
, args
, 6, &sp
, &pc
))
571 res
= sprintf(buffer
, "running\n");
573 res
= sprintf(buffer
, "%ld 0x%lx 0x%lx\n", nr
, sp
, pc
);
575 res
= sprintf(buffer
,
576 "%ld 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx\n",
578 args
[0], args
[1], args
[2], args
[3], args
[4], args
[5],
583 #endif /* CONFIG_HAVE_ARCH_TRACEHOOK */
585 /************************************************************************/
586 /* Here the fs part begins */
587 /************************************************************************/
589 /* permission checks */
590 static int proc_fd_access_allowed(struct inode
*inode
)
592 struct task_struct
*task
;
594 /* Allow access to a task's file descriptors if it is us or we
595 * may use ptrace attach to the process and find out that
598 task
= get_proc_task(inode
);
600 allowed
= ptrace_may_access(task
, PTRACE_MODE_READ
);
601 put_task_struct(task
);
606 int proc_setattr(struct dentry
*dentry
, struct iattr
*attr
)
609 struct inode
*inode
= dentry
->d_inode
;
611 if (attr
->ia_valid
& ATTR_MODE
)
614 error
= inode_change_ok(inode
, attr
);
618 if ((attr
->ia_valid
& ATTR_SIZE
) &&
619 attr
->ia_size
!= i_size_read(inode
)) {
620 error
= vmtruncate(inode
, attr
->ia_size
);
625 setattr_copy(inode
, attr
);
626 mark_inode_dirty(inode
);
630 static const struct inode_operations proc_def_inode_operations
= {
631 .setattr
= proc_setattr
,
634 #define PROC_BLOCK_SIZE (3*1024) /* 4K page size but our output routines use some slack for overruns */
636 static ssize_t
proc_info_read(struct file
* file
, char __user
* buf
,
637 size_t count
, loff_t
*ppos
)
639 struct inode
* inode
= file
->f_path
.dentry
->d_inode
;
642 struct task_struct
*task
= get_proc_task(inode
);
648 if (count
> PROC_BLOCK_SIZE
)
649 count
= PROC_BLOCK_SIZE
;
652 if (!(page
= __get_free_page(GFP_TEMPORARY
)))
655 length
= PROC_I(inode
)->op
.proc_read(task
, (char*)page
);
658 length
= simple_read_from_buffer(buf
, count
, ppos
, (char *)page
, length
);
661 put_task_struct(task
);
666 static const struct file_operations proc_info_file_operations
= {
667 .read
= proc_info_read
,
668 .llseek
= generic_file_llseek
,
671 static int proc_single_show(struct seq_file
*m
, void *v
)
673 struct inode
*inode
= m
->private;
674 struct pid_namespace
*ns
;
676 struct task_struct
*task
;
679 ns
= inode
->i_sb
->s_fs_info
;
680 pid
= proc_pid(inode
);
681 task
= get_pid_task(pid
, PIDTYPE_PID
);
685 ret
= PROC_I(inode
)->op
.proc_show(m
, ns
, pid
, task
);
687 put_task_struct(task
);
691 static int proc_single_open(struct inode
*inode
, struct file
*filp
)
693 return single_open(filp
, proc_single_show
, inode
);
696 static const struct file_operations proc_single_file_operations
= {
697 .open
= proc_single_open
,
700 .release
= single_release
,
703 static int mem_open(struct inode
* inode
, struct file
* file
)
705 file
->private_data
= (void*)((long)current
->self_exec_id
);
706 /* OK to pass negative loff_t, we can catch out-of-range */
707 file
->f_mode
|= FMODE_UNSIGNED_OFFSET
;
711 static ssize_t
mem_read(struct file
* file
, char __user
* buf
,
712 size_t count
, loff_t
*ppos
)
714 struct task_struct
*task
= get_proc_task(file
->f_path
.dentry
->d_inode
);
716 unsigned long src
= *ppos
;
718 struct mm_struct
*mm
;
724 page
= (char *)__get_free_page(GFP_TEMPORARY
);
728 mm
= check_mem_permission(task
);
735 if (file
->private_data
!= (void*)((long)current
->self_exec_id
))
741 int this_len
, retval
;
743 this_len
= (count
> PAGE_SIZE
) ? PAGE_SIZE
: count
;
744 retval
= access_remote_vm(mm
, src
, page
, this_len
, 0);
751 if (copy_to_user(buf
, page
, retval
)) {
766 free_page((unsigned long) page
);
768 put_task_struct(task
);
773 static ssize_t
mem_write(struct file
* file
, const char __user
*buf
,
774 size_t count
, loff_t
*ppos
)
778 struct task_struct
*task
= get_proc_task(file
->f_path
.dentry
->d_inode
);
779 unsigned long dst
= *ppos
;
780 struct mm_struct
*mm
;
787 page
= (char *)__get_free_page(GFP_TEMPORARY
);
791 mm
= check_mem_permission(task
);
792 copied
= PTR_ERR(mm
);
797 if (file
->private_data
!= (void *)((long)current
->self_exec_id
))
802 int this_len
, retval
;
804 this_len
= (count
> PAGE_SIZE
) ? PAGE_SIZE
: count
;
805 if (copy_from_user(page
, buf
, this_len
)) {
809 retval
= access_remote_vm(mm
, dst
, page
, this_len
, 1);
825 free_page((unsigned long) page
);
827 put_task_struct(task
);
832 loff_t
mem_lseek(struct file
*file
, loff_t offset
, int orig
)
836 file
->f_pos
= offset
;
839 file
->f_pos
+= offset
;
844 force_successful_syscall_return();
848 static const struct file_operations proc_mem_operations
= {
855 static ssize_t
environ_read(struct file
*file
, char __user
*buf
,
856 size_t count
, loff_t
*ppos
)
858 struct task_struct
*task
= get_proc_task(file
->f_dentry
->d_inode
);
860 unsigned long src
= *ppos
;
862 struct mm_struct
*mm
;
868 page
= (char *)__get_free_page(GFP_TEMPORARY
);
873 mm
= mm_for_maps(task
);
875 if (!mm
|| IS_ERR(mm
))
880 int this_len
, retval
, max_len
;
882 this_len
= mm
->env_end
- (mm
->env_start
+ src
);
887 max_len
= (count
> PAGE_SIZE
) ? PAGE_SIZE
: count
;
888 this_len
= (this_len
> max_len
) ? max_len
: this_len
;
890 retval
= access_process_vm(task
, (mm
->env_start
+ src
),
898 if (copy_to_user(buf
, page
, retval
)) {
912 free_page((unsigned long) page
);
914 put_task_struct(task
);
919 static const struct file_operations proc_environ_operations
= {
920 .read
= environ_read
,
921 .llseek
= generic_file_llseek
,
924 static ssize_t
oom_adjust_read(struct file
*file
, char __user
*buf
,
925 size_t count
, loff_t
*ppos
)
927 struct task_struct
*task
= get_proc_task(file
->f_path
.dentry
->d_inode
);
928 char buffer
[PROC_NUMBUF
];
930 int oom_adjust
= OOM_DISABLE
;
936 if (lock_task_sighand(task
, &flags
)) {
937 oom_adjust
= task
->signal
->oom_adj
;
938 unlock_task_sighand(task
, &flags
);
941 put_task_struct(task
);
943 len
= snprintf(buffer
, sizeof(buffer
), "%i\n", oom_adjust
);
945 return simple_read_from_buffer(buf
, count
, ppos
, buffer
, len
);
948 static ssize_t
oom_adjust_write(struct file
*file
, const char __user
*buf
,
949 size_t count
, loff_t
*ppos
)
951 struct task_struct
*task
;
952 char buffer
[PROC_NUMBUF
];
957 memset(buffer
, 0, sizeof(buffer
));
958 if (count
> sizeof(buffer
) - 1)
959 count
= sizeof(buffer
) - 1;
960 if (copy_from_user(buffer
, buf
, count
)) {
965 err
= kstrtoint(strstrip(buffer
), 0, &oom_adjust
);
968 if ((oom_adjust
< OOM_ADJUST_MIN
|| oom_adjust
> OOM_ADJUST_MAX
) &&
969 oom_adjust
!= OOM_DISABLE
) {
974 task
= get_proc_task(file
->f_path
.dentry
->d_inode
);
986 if (!lock_task_sighand(task
, &flags
)) {
991 if (oom_adjust
< task
->signal
->oom_adj
&& !capable(CAP_SYS_RESOURCE
)) {
997 * Warn that /proc/pid/oom_adj is deprecated, see
998 * Documentation/feature-removal-schedule.txt.
1000 printk_once(KERN_WARNING
"%s (%d): /proc/%d/oom_adj is deprecated, please use /proc/%d/oom_score_adj instead.\n",
1001 current
->comm
, task_pid_nr(current
), task_pid_nr(task
),
1003 task
->signal
->oom_adj
= oom_adjust
;
1005 * Scale /proc/pid/oom_score_adj appropriately ensuring that a maximum
1006 * value is always attainable.
1008 if (task
->signal
->oom_adj
== OOM_ADJUST_MAX
)
1009 task
->signal
->oom_score_adj
= OOM_SCORE_ADJ_MAX
;
1011 task
->signal
->oom_score_adj
= (oom_adjust
* OOM_SCORE_ADJ_MAX
) /
1014 unlock_task_sighand(task
, &flags
);
1017 put_task_struct(task
);
1019 return err
< 0 ? err
: count
;
1022 static const struct file_operations proc_oom_adjust_operations
= {
1023 .read
= oom_adjust_read
,
1024 .write
= oom_adjust_write
,
1025 .llseek
= generic_file_llseek
,
1028 static ssize_t
oom_score_adj_read(struct file
*file
, char __user
*buf
,
1029 size_t count
, loff_t
*ppos
)
1031 struct task_struct
*task
= get_proc_task(file
->f_path
.dentry
->d_inode
);
1032 char buffer
[PROC_NUMBUF
];
1033 int oom_score_adj
= OOM_SCORE_ADJ_MIN
;
1034 unsigned long flags
;
1039 if (lock_task_sighand(task
, &flags
)) {
1040 oom_score_adj
= task
->signal
->oom_score_adj
;
1041 unlock_task_sighand(task
, &flags
);
1043 put_task_struct(task
);
1044 len
= snprintf(buffer
, sizeof(buffer
), "%d\n", oom_score_adj
);
1045 return simple_read_from_buffer(buf
, count
, ppos
, buffer
, len
);
1048 static ssize_t
oom_score_adj_write(struct file
*file
, const char __user
*buf
,
1049 size_t count
, loff_t
*ppos
)
1051 struct task_struct
*task
;
1052 char buffer
[PROC_NUMBUF
];
1053 unsigned long flags
;
1057 memset(buffer
, 0, sizeof(buffer
));
1058 if (count
> sizeof(buffer
) - 1)
1059 count
= sizeof(buffer
) - 1;
1060 if (copy_from_user(buffer
, buf
, count
)) {
1065 err
= kstrtoint(strstrip(buffer
), 0, &oom_score_adj
);
1068 if (oom_score_adj
< OOM_SCORE_ADJ_MIN
||
1069 oom_score_adj
> OOM_SCORE_ADJ_MAX
) {
1074 task
= get_proc_task(file
->f_path
.dentry
->d_inode
);
1086 if (!lock_task_sighand(task
, &flags
)) {
1091 if (oom_score_adj
< task
->signal
->oom_score_adj_min
&&
1092 !capable(CAP_SYS_RESOURCE
)) {
1097 task
->signal
->oom_score_adj
= oom_score_adj
;
1098 if (has_capability_noaudit(current
, CAP_SYS_RESOURCE
))
1099 task
->signal
->oom_score_adj_min
= oom_score_adj
;
1101 * Scale /proc/pid/oom_adj appropriately ensuring that OOM_DISABLE is
1102 * always attainable.
1104 if (task
->signal
->oom_score_adj
== OOM_SCORE_ADJ_MIN
)
1105 task
->signal
->oom_adj
= OOM_DISABLE
;
1107 task
->signal
->oom_adj
= (oom_score_adj
* OOM_ADJUST_MAX
) /
1110 unlock_task_sighand(task
, &flags
);
1113 put_task_struct(task
);
1115 return err
< 0 ? err
: count
;
1118 static const struct file_operations proc_oom_score_adj_operations
= {
1119 .read
= oom_score_adj_read
,
1120 .write
= oom_score_adj_write
,
1121 .llseek
= default_llseek
,
1124 #ifdef CONFIG_AUDITSYSCALL
1125 #define TMPBUFLEN 21
1126 static ssize_t
proc_loginuid_read(struct file
* file
, char __user
* buf
,
1127 size_t count
, loff_t
*ppos
)
1129 struct inode
* inode
= file
->f_path
.dentry
->d_inode
;
1130 struct task_struct
*task
= get_proc_task(inode
);
1132 char tmpbuf
[TMPBUFLEN
];
1136 length
= scnprintf(tmpbuf
, TMPBUFLEN
, "%u",
1137 audit_get_loginuid(task
));
1138 put_task_struct(task
);
1139 return simple_read_from_buffer(buf
, count
, ppos
, tmpbuf
, length
);
1142 static ssize_t
proc_loginuid_write(struct file
* file
, const char __user
* buf
,
1143 size_t count
, loff_t
*ppos
)
1145 struct inode
* inode
= file
->f_path
.dentry
->d_inode
;
1150 if (!capable(CAP_AUDIT_CONTROL
))
1154 if (current
!= pid_task(proc_pid(inode
), PIDTYPE_PID
)) {
1160 if (count
>= PAGE_SIZE
)
1161 count
= PAGE_SIZE
- 1;
1164 /* No partial writes. */
1167 page
= (char*)__get_free_page(GFP_TEMPORARY
);
1171 if (copy_from_user(page
, buf
, count
))
1175 loginuid
= simple_strtoul(page
, &tmp
, 10);
1181 length
= audit_set_loginuid(current
, loginuid
);
1182 if (likely(length
== 0))
1186 free_page((unsigned long) page
);
1190 static const struct file_operations proc_loginuid_operations
= {
1191 .read
= proc_loginuid_read
,
1192 .write
= proc_loginuid_write
,
1193 .llseek
= generic_file_llseek
,
1196 static ssize_t
proc_sessionid_read(struct file
* file
, char __user
* buf
,
1197 size_t count
, loff_t
*ppos
)
1199 struct inode
* inode
= file
->f_path
.dentry
->d_inode
;
1200 struct task_struct
*task
= get_proc_task(inode
);
1202 char tmpbuf
[TMPBUFLEN
];
1206 length
= scnprintf(tmpbuf
, TMPBUFLEN
, "%u",
1207 audit_get_sessionid(task
));
1208 put_task_struct(task
);
1209 return simple_read_from_buffer(buf
, count
, ppos
, tmpbuf
, length
);
1212 static const struct file_operations proc_sessionid_operations
= {
1213 .read
= proc_sessionid_read
,
1214 .llseek
= generic_file_llseek
,
1218 #ifdef CONFIG_FAULT_INJECTION
1219 static ssize_t
proc_fault_inject_read(struct file
* file
, char __user
* buf
,
1220 size_t count
, loff_t
*ppos
)
1222 struct task_struct
*task
= get_proc_task(file
->f_dentry
->d_inode
);
1223 char buffer
[PROC_NUMBUF
];
1229 make_it_fail
= task
->make_it_fail
;
1230 put_task_struct(task
);
1232 len
= snprintf(buffer
, sizeof(buffer
), "%i\n", make_it_fail
);
1234 return simple_read_from_buffer(buf
, count
, ppos
, buffer
, len
);
1237 static ssize_t
proc_fault_inject_write(struct file
* file
,
1238 const char __user
* buf
, size_t count
, loff_t
*ppos
)
1240 struct task_struct
*task
;
1241 char buffer
[PROC_NUMBUF
], *end
;
1244 if (!capable(CAP_SYS_RESOURCE
))
1246 memset(buffer
, 0, sizeof(buffer
));
1247 if (count
> sizeof(buffer
) - 1)
1248 count
= sizeof(buffer
) - 1;
1249 if (copy_from_user(buffer
, buf
, count
))
1251 make_it_fail
= simple_strtol(strstrip(buffer
), &end
, 0);
1254 task
= get_proc_task(file
->f_dentry
->d_inode
);
1257 task
->make_it_fail
= make_it_fail
;
1258 put_task_struct(task
);
1263 static const struct file_operations proc_fault_inject_operations
= {
1264 .read
= proc_fault_inject_read
,
1265 .write
= proc_fault_inject_write
,
1266 .llseek
= generic_file_llseek
,
1271 #ifdef CONFIG_SCHED_DEBUG
1273 * Print out various scheduling related per-task fields:
1275 static int sched_show(struct seq_file
*m
, void *v
)
1277 struct inode
*inode
= m
->private;
1278 struct task_struct
*p
;
1280 p
= get_proc_task(inode
);
1283 proc_sched_show_task(p
, m
);
1291 sched_write(struct file
*file
, const char __user
*buf
,
1292 size_t count
, loff_t
*offset
)
1294 struct inode
*inode
= file
->f_path
.dentry
->d_inode
;
1295 struct task_struct
*p
;
1297 p
= get_proc_task(inode
);
1300 proc_sched_set_task(p
);
1307 static int sched_open(struct inode
*inode
, struct file
*filp
)
1309 return single_open(filp
, sched_show
, inode
);
1312 static const struct file_operations proc_pid_sched_operations
= {
1315 .write
= sched_write
,
1316 .llseek
= seq_lseek
,
1317 .release
= single_release
,
1322 #ifdef CONFIG_SCHED_AUTOGROUP
1324 * Print out autogroup related information:
1326 static int sched_autogroup_show(struct seq_file
*m
, void *v
)
1328 struct inode
*inode
= m
->private;
1329 struct task_struct
*p
;
1331 p
= get_proc_task(inode
);
1334 proc_sched_autogroup_show_task(p
, m
);
1342 sched_autogroup_write(struct file
*file
, const char __user
*buf
,
1343 size_t count
, loff_t
*offset
)
1345 struct inode
*inode
= file
->f_path
.dentry
->d_inode
;
1346 struct task_struct
*p
;
1347 char buffer
[PROC_NUMBUF
];
1351 memset(buffer
, 0, sizeof(buffer
));
1352 if (count
> sizeof(buffer
) - 1)
1353 count
= sizeof(buffer
) - 1;
1354 if (copy_from_user(buffer
, buf
, count
))
1357 err
= kstrtoint(strstrip(buffer
), 0, &nice
);
1361 p
= get_proc_task(inode
);
1366 err
= proc_sched_autogroup_set_nice(p
, &err
);
1375 static int sched_autogroup_open(struct inode
*inode
, struct file
*filp
)
1379 ret
= single_open(filp
, sched_autogroup_show
, NULL
);
1381 struct seq_file
*m
= filp
->private_data
;
1388 static const struct file_operations proc_pid_sched_autogroup_operations
= {
1389 .open
= sched_autogroup_open
,
1391 .write
= sched_autogroup_write
,
1392 .llseek
= seq_lseek
,
1393 .release
= single_release
,
1396 #endif /* CONFIG_SCHED_AUTOGROUP */
1398 static ssize_t
comm_write(struct file
*file
, const char __user
*buf
,
1399 size_t count
, loff_t
*offset
)
1401 struct inode
*inode
= file
->f_path
.dentry
->d_inode
;
1402 struct task_struct
*p
;
1403 char buffer
[TASK_COMM_LEN
];
1405 memset(buffer
, 0, sizeof(buffer
));
1406 if (count
> sizeof(buffer
) - 1)
1407 count
= sizeof(buffer
) - 1;
1408 if (copy_from_user(buffer
, buf
, count
))
1411 p
= get_proc_task(inode
);
1415 if (same_thread_group(current
, p
))
1416 set_task_comm(p
, buffer
);
1425 static int comm_show(struct seq_file
*m
, void *v
)
1427 struct inode
*inode
= m
->private;
1428 struct task_struct
*p
;
1430 p
= get_proc_task(inode
);
1435 seq_printf(m
, "%s\n", p
->comm
);
1443 static int comm_open(struct inode
*inode
, struct file
*filp
)
1445 return single_open(filp
, comm_show
, inode
);
1448 static const struct file_operations proc_pid_set_comm_operations
= {
1451 .write
= comm_write
,
1452 .llseek
= seq_lseek
,
1453 .release
= single_release
,
1456 static int proc_exe_link(struct inode
*inode
, struct path
*exe_path
)
1458 struct task_struct
*task
;
1459 struct mm_struct
*mm
;
1460 struct file
*exe_file
;
1462 task
= get_proc_task(inode
);
1465 mm
= get_task_mm(task
);
1466 put_task_struct(task
);
1469 exe_file
= get_mm_exe_file(mm
);
1472 *exe_path
= exe_file
->f_path
;
1473 path_get(&exe_file
->f_path
);
1480 static void *proc_pid_follow_link(struct dentry
*dentry
, struct nameidata
*nd
)
1482 struct inode
*inode
= dentry
->d_inode
;
1483 int error
= -EACCES
;
1485 /* We don't need a base pointer in the /proc filesystem */
1486 path_put(&nd
->path
);
1488 /* Are we allowed to snoop on the tasks file descriptors? */
1489 if (!proc_fd_access_allowed(inode
))
1492 error
= PROC_I(inode
)->op
.proc_get_link(inode
, &nd
->path
);
1494 return ERR_PTR(error
);
1497 static int do_proc_readlink(struct path
*path
, char __user
*buffer
, int buflen
)
1499 char *tmp
= (char*)__get_free_page(GFP_TEMPORARY
);
1506 pathname
= d_path(path
, tmp
, PAGE_SIZE
);
1507 len
= PTR_ERR(pathname
);
1508 if (IS_ERR(pathname
))
1510 len
= tmp
+ PAGE_SIZE
- 1 - pathname
;
1514 if (copy_to_user(buffer
, pathname
, len
))
1517 free_page((unsigned long)tmp
);
1521 static int proc_pid_readlink(struct dentry
* dentry
, char __user
* buffer
, int buflen
)
1523 int error
= -EACCES
;
1524 struct inode
*inode
= dentry
->d_inode
;
1527 /* Are we allowed to snoop on the tasks file descriptors? */
1528 if (!proc_fd_access_allowed(inode
))
1531 error
= PROC_I(inode
)->op
.proc_get_link(inode
, &path
);
1535 error
= do_proc_readlink(&path
, buffer
, buflen
);
1541 static const struct inode_operations proc_pid_link_inode_operations
= {
1542 .readlink
= proc_pid_readlink
,
1543 .follow_link
= proc_pid_follow_link
,
1544 .setattr
= proc_setattr
,
1548 /* building an inode */
1550 static int task_dumpable(struct task_struct
*task
)
1553 struct mm_struct
*mm
;
1558 dumpable
= get_dumpable(mm
);
1565 struct inode
*proc_pid_make_inode(struct super_block
* sb
, struct task_struct
*task
)
1567 struct inode
* inode
;
1568 struct proc_inode
*ei
;
1569 const struct cred
*cred
;
1571 /* We need a new inode */
1573 inode
= new_inode(sb
);
1579 inode
->i_ino
= get_next_ino();
1580 inode
->i_mtime
= inode
->i_atime
= inode
->i_ctime
= CURRENT_TIME
;
1581 inode
->i_op
= &proc_def_inode_operations
;
1584 * grab the reference to task.
1586 ei
->pid
= get_task_pid(task
, PIDTYPE_PID
);
1590 if (task_dumpable(task
)) {
1592 cred
= __task_cred(task
);
1593 inode
->i_uid
= cred
->euid
;
1594 inode
->i_gid
= cred
->egid
;
1597 security_task_to_inode(task
, inode
);
1607 int pid_getattr(struct vfsmount
*mnt
, struct dentry
*dentry
, struct kstat
*stat
)
1609 struct inode
*inode
= dentry
->d_inode
;
1610 struct task_struct
*task
;
1611 const struct cred
*cred
;
1613 generic_fillattr(inode
, stat
);
1618 task
= pid_task(proc_pid(inode
), PIDTYPE_PID
);
1620 if ((inode
->i_mode
== (S_IFDIR
|S_IRUGO
|S_IXUGO
)) ||
1621 task_dumpable(task
)) {
1622 cred
= __task_cred(task
);
1623 stat
->uid
= cred
->euid
;
1624 stat
->gid
= cred
->egid
;
1634 * Exceptional case: normally we are not allowed to unhash a busy
1635 * directory. In this case, however, we can do it - no aliasing problems
1636 * due to the way we treat inodes.
1638 * Rewrite the inode's ownerships here because the owning task may have
1639 * performed a setuid(), etc.
1641 * Before the /proc/pid/status file was created the only way to read
1642 * the effective uid of a /process was to stat /proc/pid. Reading
1643 * /proc/pid/status is slow enough that procps and other packages
1644 * kept stating /proc/pid. To keep the rules in /proc simple I have
1645 * made this apply to all per process world readable and executable
1648 int pid_revalidate(struct dentry
*dentry
, struct nameidata
*nd
)
1650 struct inode
*inode
;
1651 struct task_struct
*task
;
1652 const struct cred
*cred
;
1654 if (nd
&& nd
->flags
& LOOKUP_RCU
)
1657 inode
= dentry
->d_inode
;
1658 task
= get_proc_task(inode
);
1661 if ((inode
->i_mode
== (S_IFDIR
|S_IRUGO
|S_IXUGO
)) ||
1662 task_dumpable(task
)) {
1664 cred
= __task_cred(task
);
1665 inode
->i_uid
= cred
->euid
;
1666 inode
->i_gid
= cred
->egid
;
1672 inode
->i_mode
&= ~(S_ISUID
| S_ISGID
);
1673 security_task_to_inode(task
, inode
);
1674 put_task_struct(task
);
1681 static int pid_delete_dentry(const struct dentry
* dentry
)
1683 /* Is the task we represent dead?
1684 * If so, then don't put the dentry on the lru list,
1685 * kill it immediately.
1687 return !proc_pid(dentry
->d_inode
)->tasks
[PIDTYPE_PID
].first
;
1690 const struct dentry_operations pid_dentry_operations
=
1692 .d_revalidate
= pid_revalidate
,
1693 .d_delete
= pid_delete_dentry
,
1699 * Fill a directory entry.
1701 * If possible create the dcache entry and derive our inode number and
1702 * file type from dcache entry.
1704 * Since all of the proc inode numbers are dynamically generated, the inode
1705 * numbers do not exist until the inode is cache. This means creating the
1706 * the dcache entry in readdir is necessary to keep the inode numbers
1707 * reported by readdir in sync with the inode numbers reported
1710 int proc_fill_cache(struct file
*filp
, void *dirent
, filldir_t filldir
,
1711 const char *name
, int len
,
1712 instantiate_t instantiate
, struct task_struct
*task
, const void *ptr
)
1714 struct dentry
*child
, *dir
= filp
->f_path
.dentry
;
1715 struct inode
*inode
;
1718 unsigned type
= DT_UNKNOWN
;
1722 qname
.hash
= full_name_hash(name
, len
);
1724 child
= d_lookup(dir
, &qname
);
1727 new = d_alloc(dir
, &qname
);
1729 child
= instantiate(dir
->d_inode
, new, task
, ptr
);
1736 if (!child
|| IS_ERR(child
) || !child
->d_inode
)
1737 goto end_instantiate
;
1738 inode
= child
->d_inode
;
1741 type
= inode
->i_mode
>> 12;
1746 ino
= find_inode_number(dir
, &qname
);
1749 return filldir(dirent
, name
, len
, filp
->f_pos
, ino
, type
);
1752 static unsigned name_to_int(struct dentry
*dentry
)
1754 const char *name
= dentry
->d_name
.name
;
1755 int len
= dentry
->d_name
.len
;
1758 if (len
> 1 && *name
== '0')
1761 unsigned c
= *name
++ - '0';
1764 if (n
>= (~0U-9)/10)
1774 #define PROC_FDINFO_MAX 64
1776 static int proc_fd_info(struct inode
*inode
, struct path
*path
, char *info
)
1778 struct task_struct
*task
= get_proc_task(inode
);
1779 struct files_struct
*files
= NULL
;
1781 int fd
= proc_fd(inode
);
1784 files
= get_files_struct(task
);
1785 put_task_struct(task
);
1789 * We are not taking a ref to the file structure, so we must
1792 spin_lock(&files
->file_lock
);
1793 file
= fcheck_files(files
, fd
);
1795 unsigned int f_flags
;
1796 struct fdtable
*fdt
;
1798 fdt
= files_fdtable(files
);
1799 f_flags
= file
->f_flags
& ~O_CLOEXEC
;
1800 if (FD_ISSET(fd
, fdt
->close_on_exec
))
1801 f_flags
|= O_CLOEXEC
;
1804 *path
= file
->f_path
;
1805 path_get(&file
->f_path
);
1808 snprintf(info
, PROC_FDINFO_MAX
,
1811 (long long) file
->f_pos
,
1813 spin_unlock(&files
->file_lock
);
1814 put_files_struct(files
);
1817 spin_unlock(&files
->file_lock
);
1818 put_files_struct(files
);
1823 static int proc_fd_link(struct inode
*inode
, struct path
*path
)
1825 return proc_fd_info(inode
, path
, NULL
);
1828 static int tid_fd_revalidate(struct dentry
*dentry
, struct nameidata
*nd
)
1830 struct inode
*inode
;
1831 struct task_struct
*task
;
1833 struct files_struct
*files
;
1834 const struct cred
*cred
;
1836 if (nd
&& nd
->flags
& LOOKUP_RCU
)
1839 inode
= dentry
->d_inode
;
1840 task
= get_proc_task(inode
);
1841 fd
= proc_fd(inode
);
1844 files
= get_files_struct(task
);
1847 if (fcheck_files(files
, fd
)) {
1849 put_files_struct(files
);
1850 if (task_dumpable(task
)) {
1852 cred
= __task_cred(task
);
1853 inode
->i_uid
= cred
->euid
;
1854 inode
->i_gid
= cred
->egid
;
1860 inode
->i_mode
&= ~(S_ISUID
| S_ISGID
);
1861 security_task_to_inode(task
, inode
);
1862 put_task_struct(task
);
1866 put_files_struct(files
);
1868 put_task_struct(task
);
1874 static const struct dentry_operations tid_fd_dentry_operations
=
1876 .d_revalidate
= tid_fd_revalidate
,
1877 .d_delete
= pid_delete_dentry
,
1880 static struct dentry
*proc_fd_instantiate(struct inode
*dir
,
1881 struct dentry
*dentry
, struct task_struct
*task
, const void *ptr
)
1883 unsigned fd
= *(const unsigned *)ptr
;
1885 struct files_struct
*files
;
1886 struct inode
*inode
;
1887 struct proc_inode
*ei
;
1888 struct dentry
*error
= ERR_PTR(-ENOENT
);
1890 inode
= proc_pid_make_inode(dir
->i_sb
, task
);
1895 files
= get_files_struct(task
);
1898 inode
->i_mode
= S_IFLNK
;
1901 * We are not taking a ref to the file structure, so we must
1904 spin_lock(&files
->file_lock
);
1905 file
= fcheck_files(files
, fd
);
1908 if (file
->f_mode
& FMODE_READ
)
1909 inode
->i_mode
|= S_IRUSR
| S_IXUSR
;
1910 if (file
->f_mode
& FMODE_WRITE
)
1911 inode
->i_mode
|= S_IWUSR
| S_IXUSR
;
1912 spin_unlock(&files
->file_lock
);
1913 put_files_struct(files
);
1915 inode
->i_op
= &proc_pid_link_inode_operations
;
1917 ei
->op
.proc_get_link
= proc_fd_link
;
1918 d_set_d_op(dentry
, &tid_fd_dentry_operations
);
1919 d_add(dentry
, inode
);
1920 /* Close the race of the process dying before we return the dentry */
1921 if (tid_fd_revalidate(dentry
, NULL
))
1927 spin_unlock(&files
->file_lock
);
1928 put_files_struct(files
);
1934 static struct dentry
*proc_lookupfd_common(struct inode
*dir
,
1935 struct dentry
*dentry
,
1936 instantiate_t instantiate
)
1938 struct task_struct
*task
= get_proc_task(dir
);
1939 unsigned fd
= name_to_int(dentry
);
1940 struct dentry
*result
= ERR_PTR(-ENOENT
);
1947 result
= instantiate(dir
, dentry
, task
, &fd
);
1949 put_task_struct(task
);
1954 static int proc_readfd_common(struct file
* filp
, void * dirent
,
1955 filldir_t filldir
, instantiate_t instantiate
)
1957 struct dentry
*dentry
= filp
->f_path
.dentry
;
1958 struct inode
*inode
= dentry
->d_inode
;
1959 struct task_struct
*p
= get_proc_task(inode
);
1960 unsigned int fd
, ino
;
1962 struct files_struct
* files
;
1972 if (filldir(dirent
, ".", 1, 0, inode
->i_ino
, DT_DIR
) < 0)
1976 ino
= parent_ino(dentry
);
1977 if (filldir(dirent
, "..", 2, 1, ino
, DT_DIR
) < 0)
1981 files
= get_files_struct(p
);
1985 for (fd
= filp
->f_pos
-2;
1986 fd
< files_fdtable(files
)->max_fds
;
1987 fd
++, filp
->f_pos
++) {
1988 char name
[PROC_NUMBUF
];
1991 if (!fcheck_files(files
, fd
))
1995 len
= snprintf(name
, sizeof(name
), "%d", fd
);
1996 if (proc_fill_cache(filp
, dirent
, filldir
,
1997 name
, len
, instantiate
,
2005 put_files_struct(files
);
2013 static struct dentry
*proc_lookupfd(struct inode
*dir
, struct dentry
*dentry
,
2014 struct nameidata
*nd
)
2016 return proc_lookupfd_common(dir
, dentry
, proc_fd_instantiate
);
2019 static int proc_readfd(struct file
*filp
, void *dirent
, filldir_t filldir
)
2021 return proc_readfd_common(filp
, dirent
, filldir
, proc_fd_instantiate
);
2024 static ssize_t
proc_fdinfo_read(struct file
*file
, char __user
*buf
,
2025 size_t len
, loff_t
*ppos
)
2027 char tmp
[PROC_FDINFO_MAX
];
2028 int err
= proc_fd_info(file
->f_path
.dentry
->d_inode
, NULL
, tmp
);
2030 err
= simple_read_from_buffer(buf
, len
, ppos
, tmp
, strlen(tmp
));
2034 static const struct file_operations proc_fdinfo_file_operations
= {
2035 .open
= nonseekable_open
,
2036 .read
= proc_fdinfo_read
,
2037 .llseek
= no_llseek
,
2040 static const struct file_operations proc_fd_operations
= {
2041 .read
= generic_read_dir
,
2042 .readdir
= proc_readfd
,
2043 .llseek
= default_llseek
,
2047 * /proc/pid/fd needs a special permission handler so that a process can still
2048 * access /proc/self/fd after it has executed a setuid().
2050 static int proc_fd_permission(struct inode
*inode
, int mask
)
2052 int rv
= generic_permission(inode
, mask
);
2055 if (task_pid(current
) == proc_pid(inode
))
2061 * proc directories can do almost nothing..
2063 static const struct inode_operations proc_fd_inode_operations
= {
2064 .lookup
= proc_lookupfd
,
2065 .permission
= proc_fd_permission
,
2066 .setattr
= proc_setattr
,
2069 static struct dentry
*proc_fdinfo_instantiate(struct inode
*dir
,
2070 struct dentry
*dentry
, struct task_struct
*task
, const void *ptr
)
2072 unsigned fd
= *(unsigned *)ptr
;
2073 struct inode
*inode
;
2074 struct proc_inode
*ei
;
2075 struct dentry
*error
= ERR_PTR(-ENOENT
);
2077 inode
= proc_pid_make_inode(dir
->i_sb
, task
);
2082 inode
->i_mode
= S_IFREG
| S_IRUSR
;
2083 inode
->i_fop
= &proc_fdinfo_file_operations
;
2084 d_set_d_op(dentry
, &tid_fd_dentry_operations
);
2085 d_add(dentry
, inode
);
2086 /* Close the race of the process dying before we return the dentry */
2087 if (tid_fd_revalidate(dentry
, NULL
))
2094 static struct dentry
*proc_lookupfdinfo(struct inode
*dir
,
2095 struct dentry
*dentry
,
2096 struct nameidata
*nd
)
2098 return proc_lookupfd_common(dir
, dentry
, proc_fdinfo_instantiate
);
2101 static int proc_readfdinfo(struct file
*filp
, void *dirent
, filldir_t filldir
)
2103 return proc_readfd_common(filp
, dirent
, filldir
,
2104 proc_fdinfo_instantiate
);
2107 static const struct file_operations proc_fdinfo_operations
= {
2108 .read
= generic_read_dir
,
2109 .readdir
= proc_readfdinfo
,
2110 .llseek
= default_llseek
,
2114 * proc directories can do almost nothing..
2116 static const struct inode_operations proc_fdinfo_inode_operations
= {
2117 .lookup
= proc_lookupfdinfo
,
2118 .setattr
= proc_setattr
,
2122 static struct dentry
*proc_pident_instantiate(struct inode
*dir
,
2123 struct dentry
*dentry
, struct task_struct
*task
, const void *ptr
)
2125 const struct pid_entry
*p
= ptr
;
2126 struct inode
*inode
;
2127 struct proc_inode
*ei
;
2128 struct dentry
*error
= ERR_PTR(-ENOENT
);
2130 inode
= proc_pid_make_inode(dir
->i_sb
, task
);
2135 inode
->i_mode
= p
->mode
;
2136 if (S_ISDIR(inode
->i_mode
))
2137 set_nlink(inode
, 2); /* Use getattr to fix if necessary */
2139 inode
->i_op
= p
->iop
;
2141 inode
->i_fop
= p
->fop
;
2143 d_set_d_op(dentry
, &pid_dentry_operations
);
2144 d_add(dentry
, inode
);
2145 /* Close the race of the process dying before we return the dentry */
2146 if (pid_revalidate(dentry
, NULL
))
2152 static struct dentry
*proc_pident_lookup(struct inode
*dir
,
2153 struct dentry
*dentry
,
2154 const struct pid_entry
*ents
,
2157 struct dentry
*error
;
2158 struct task_struct
*task
= get_proc_task(dir
);
2159 const struct pid_entry
*p
, *last
;
2161 error
= ERR_PTR(-ENOENT
);
2167 * Yes, it does not scale. And it should not. Don't add
2168 * new entries into /proc/<tgid>/ without very good reasons.
2170 last
= &ents
[nents
- 1];
2171 for (p
= ents
; p
<= last
; p
++) {
2172 if (p
->len
!= dentry
->d_name
.len
)
2174 if (!memcmp(dentry
->d_name
.name
, p
->name
, p
->len
))
2180 error
= proc_pident_instantiate(dir
, dentry
, task
, p
);
2182 put_task_struct(task
);
2187 static int proc_pident_fill_cache(struct file
*filp
, void *dirent
,
2188 filldir_t filldir
, struct task_struct
*task
, const struct pid_entry
*p
)
2190 return proc_fill_cache(filp
, dirent
, filldir
, p
->name
, p
->len
,
2191 proc_pident_instantiate
, task
, p
);
2194 static int proc_pident_readdir(struct file
*filp
,
2195 void *dirent
, filldir_t filldir
,
2196 const struct pid_entry
*ents
, unsigned int nents
)
2199 struct dentry
*dentry
= filp
->f_path
.dentry
;
2200 struct inode
*inode
= dentry
->d_inode
;
2201 struct task_struct
*task
= get_proc_task(inode
);
2202 const struct pid_entry
*p
, *last
;
2215 if (filldir(dirent
, ".", 1, i
, ino
, DT_DIR
) < 0)
2221 ino
= parent_ino(dentry
);
2222 if (filldir(dirent
, "..", 2, i
, ino
, DT_DIR
) < 0)
2234 last
= &ents
[nents
- 1];
2236 if (proc_pident_fill_cache(filp
, dirent
, filldir
, task
, p
) < 0)
2245 put_task_struct(task
);
2250 #ifdef CONFIG_SECURITY
2251 static ssize_t
proc_pid_attr_read(struct file
* file
, char __user
* buf
,
2252 size_t count
, loff_t
*ppos
)
2254 struct inode
* inode
= file
->f_path
.dentry
->d_inode
;
2257 struct task_struct
*task
= get_proc_task(inode
);
2262 length
= security_getprocattr(task
,
2263 (char*)file
->f_path
.dentry
->d_name
.name
,
2265 put_task_struct(task
);
2267 length
= simple_read_from_buffer(buf
, count
, ppos
, p
, length
);
2272 static ssize_t
proc_pid_attr_write(struct file
* file
, const char __user
* buf
,
2273 size_t count
, loff_t
*ppos
)
2275 struct inode
* inode
= file
->f_path
.dentry
->d_inode
;
2278 struct task_struct
*task
= get_proc_task(inode
);
2283 if (count
> PAGE_SIZE
)
2286 /* No partial writes. */
2292 page
= (char*)__get_free_page(GFP_TEMPORARY
);
2297 if (copy_from_user(page
, buf
, count
))
2300 /* Guard against adverse ptrace interaction */
2301 length
= mutex_lock_interruptible(&task
->signal
->cred_guard_mutex
);
2305 length
= security_setprocattr(task
,
2306 (char*)file
->f_path
.dentry
->d_name
.name
,
2307 (void*)page
, count
);
2308 mutex_unlock(&task
->signal
->cred_guard_mutex
);
2310 free_page((unsigned long) page
);
2312 put_task_struct(task
);
2317 static const struct file_operations proc_pid_attr_operations
= {
2318 .read
= proc_pid_attr_read
,
2319 .write
= proc_pid_attr_write
,
2320 .llseek
= generic_file_llseek
,
2323 static const struct pid_entry attr_dir_stuff
[] = {
2324 REG("current", S_IRUGO
|S_IWUGO
, proc_pid_attr_operations
),
2325 REG("prev", S_IRUGO
, proc_pid_attr_operations
),
2326 REG("exec", S_IRUGO
|S_IWUGO
, proc_pid_attr_operations
),
2327 REG("fscreate", S_IRUGO
|S_IWUGO
, proc_pid_attr_operations
),
2328 REG("keycreate", S_IRUGO
|S_IWUGO
, proc_pid_attr_operations
),
2329 REG("sockcreate", S_IRUGO
|S_IWUGO
, proc_pid_attr_operations
),
2332 static int proc_attr_dir_readdir(struct file
* filp
,
2333 void * dirent
, filldir_t filldir
)
2335 return proc_pident_readdir(filp
,dirent
,filldir
,
2336 attr_dir_stuff
,ARRAY_SIZE(attr_dir_stuff
));
2339 static const struct file_operations proc_attr_dir_operations
= {
2340 .read
= generic_read_dir
,
2341 .readdir
= proc_attr_dir_readdir
,
2342 .llseek
= default_llseek
,
2345 static struct dentry
*proc_attr_dir_lookup(struct inode
*dir
,
2346 struct dentry
*dentry
, struct nameidata
*nd
)
2348 return proc_pident_lookup(dir
, dentry
,
2349 attr_dir_stuff
, ARRAY_SIZE(attr_dir_stuff
));
2352 static const struct inode_operations proc_attr_dir_inode_operations
= {
2353 .lookup
= proc_attr_dir_lookup
,
2354 .getattr
= pid_getattr
,
2355 .setattr
= proc_setattr
,
2360 #ifdef CONFIG_ELF_CORE
2361 static ssize_t
proc_coredump_filter_read(struct file
*file
, char __user
*buf
,
2362 size_t count
, loff_t
*ppos
)
2364 struct task_struct
*task
= get_proc_task(file
->f_dentry
->d_inode
);
2365 struct mm_struct
*mm
;
2366 char buffer
[PROC_NUMBUF
];
2374 mm
= get_task_mm(task
);
2376 len
= snprintf(buffer
, sizeof(buffer
), "%08lx\n",
2377 ((mm
->flags
& MMF_DUMP_FILTER_MASK
) >>
2378 MMF_DUMP_FILTER_SHIFT
));
2380 ret
= simple_read_from_buffer(buf
, count
, ppos
, buffer
, len
);
2383 put_task_struct(task
);
2388 static ssize_t
proc_coredump_filter_write(struct file
*file
,
2389 const char __user
*buf
,
2393 struct task_struct
*task
;
2394 struct mm_struct
*mm
;
2395 char buffer
[PROC_NUMBUF
], *end
;
2402 memset(buffer
, 0, sizeof(buffer
));
2403 if (count
> sizeof(buffer
) - 1)
2404 count
= sizeof(buffer
) - 1;
2405 if (copy_from_user(buffer
, buf
, count
))
2409 val
= (unsigned int)simple_strtoul(buffer
, &end
, 0);
2412 if (end
- buffer
== 0)
2416 task
= get_proc_task(file
->f_dentry
->d_inode
);
2421 mm
= get_task_mm(task
);
2425 for (i
= 0, mask
= 1; i
< MMF_DUMP_FILTER_BITS
; i
++, mask
<<= 1) {
2427 set_bit(i
+ MMF_DUMP_FILTER_SHIFT
, &mm
->flags
);
2429 clear_bit(i
+ MMF_DUMP_FILTER_SHIFT
, &mm
->flags
);
2434 put_task_struct(task
);
2439 static const struct file_operations proc_coredump_filter_operations
= {
2440 .read
= proc_coredump_filter_read
,
2441 .write
= proc_coredump_filter_write
,
2442 .llseek
= generic_file_llseek
,
2449 static int proc_self_readlink(struct dentry
*dentry
, char __user
*buffer
,
2452 struct pid_namespace
*ns
= dentry
->d_sb
->s_fs_info
;
2453 pid_t tgid
= task_tgid_nr_ns(current
, ns
);
2454 char tmp
[PROC_NUMBUF
];
2457 sprintf(tmp
, "%d", tgid
);
2458 return vfs_readlink(dentry
,buffer
,buflen
,tmp
);
2461 static void *proc_self_follow_link(struct dentry
*dentry
, struct nameidata
*nd
)
2463 struct pid_namespace
*ns
= dentry
->d_sb
->s_fs_info
;
2464 pid_t tgid
= task_tgid_nr_ns(current
, ns
);
2465 char *name
= ERR_PTR(-ENOENT
);
2469 name
= ERR_PTR(-ENOMEM
);
2471 sprintf(name
, "%d", tgid
);
2473 nd_set_link(nd
, name
);
2477 static void proc_self_put_link(struct dentry
*dentry
, struct nameidata
*nd
,
2480 char *s
= nd_get_link(nd
);
2485 static const struct inode_operations proc_self_inode_operations
= {
2486 .readlink
= proc_self_readlink
,
2487 .follow_link
= proc_self_follow_link
,
2488 .put_link
= proc_self_put_link
,
2494 * These are the directory entries in the root directory of /proc
2495 * that properly belong to the /proc filesystem, as they describe
2496 * describe something that is process related.
2498 static const struct pid_entry proc_base_stuff
[] = {
2499 NOD("self", S_IFLNK
|S_IRWXUGO
,
2500 &proc_self_inode_operations
, NULL
, {}),
2503 static struct dentry
*proc_base_instantiate(struct inode
*dir
,
2504 struct dentry
*dentry
, struct task_struct
*task
, const void *ptr
)
2506 const struct pid_entry
*p
= ptr
;
2507 struct inode
*inode
;
2508 struct proc_inode
*ei
;
2509 struct dentry
*error
;
2511 /* Allocate the inode */
2512 error
= ERR_PTR(-ENOMEM
);
2513 inode
= new_inode(dir
->i_sb
);
2517 /* Initialize the inode */
2519 inode
->i_ino
= get_next_ino();
2520 inode
->i_mtime
= inode
->i_atime
= inode
->i_ctime
= CURRENT_TIME
;
2523 * grab the reference to the task.
2525 ei
->pid
= get_task_pid(task
, PIDTYPE_PID
);
2529 inode
->i_mode
= p
->mode
;
2530 if (S_ISDIR(inode
->i_mode
))
2531 set_nlink(inode
, 2);
2532 if (S_ISLNK(inode
->i_mode
))
2535 inode
->i_op
= p
->iop
;
2537 inode
->i_fop
= p
->fop
;
2539 d_add(dentry
, inode
);
2548 static struct dentry
*proc_base_lookup(struct inode
*dir
, struct dentry
*dentry
)
2550 struct dentry
*error
;
2551 struct task_struct
*task
= get_proc_task(dir
);
2552 const struct pid_entry
*p
, *last
;
2554 error
= ERR_PTR(-ENOENT
);
2559 /* Lookup the directory entry */
2560 last
= &proc_base_stuff
[ARRAY_SIZE(proc_base_stuff
) - 1];
2561 for (p
= proc_base_stuff
; p
<= last
; p
++) {
2562 if (p
->len
!= dentry
->d_name
.len
)
2564 if (!memcmp(dentry
->d_name
.name
, p
->name
, p
->len
))
2570 error
= proc_base_instantiate(dir
, dentry
, task
, p
);
2573 put_task_struct(task
);
2578 static int proc_base_fill_cache(struct file
*filp
, void *dirent
,
2579 filldir_t filldir
, struct task_struct
*task
, const struct pid_entry
*p
)
2581 return proc_fill_cache(filp
, dirent
, filldir
, p
->name
, p
->len
,
2582 proc_base_instantiate
, task
, p
);
2585 #ifdef CONFIG_TASK_IO_ACCOUNTING
2586 static int do_io_accounting(struct task_struct
*task
, char *buffer
, int whole
)
2588 struct task_io_accounting acct
= task
->ioac
;
2589 unsigned long flags
;
2592 result
= mutex_lock_killable(&task
->signal
->cred_guard_mutex
);
2596 if (!ptrace_may_access(task
, PTRACE_MODE_READ
)) {
2601 if (whole
&& lock_task_sighand(task
, &flags
)) {
2602 struct task_struct
*t
= task
;
2604 task_io_accounting_add(&acct
, &task
->signal
->ioac
);
2605 while_each_thread(task
, t
)
2606 task_io_accounting_add(&acct
, &t
->ioac
);
2608 unlock_task_sighand(task
, &flags
);
2610 result
= sprintf(buffer
,
2615 "read_bytes: %llu\n"
2616 "write_bytes: %llu\n"
2617 "cancelled_write_bytes: %llu\n",
2618 (unsigned long long)acct
.rchar
,
2619 (unsigned long long)acct
.wchar
,
2620 (unsigned long long)acct
.syscr
,
2621 (unsigned long long)acct
.syscw
,
2622 (unsigned long long)acct
.read_bytes
,
2623 (unsigned long long)acct
.write_bytes
,
2624 (unsigned long long)acct
.cancelled_write_bytes
);
2626 mutex_unlock(&task
->signal
->cred_guard_mutex
);
2630 static int proc_tid_io_accounting(struct task_struct
*task
, char *buffer
)
2632 return do_io_accounting(task
, buffer
, 0);
2635 static int proc_tgid_io_accounting(struct task_struct
*task
, char *buffer
)
2637 return do_io_accounting(task
, buffer
, 1);
2639 #endif /* CONFIG_TASK_IO_ACCOUNTING */
2641 static int proc_pid_personality(struct seq_file
*m
, struct pid_namespace
*ns
,
2642 struct pid
*pid
, struct task_struct
*task
)
2644 int err
= lock_trace(task
);
2646 seq_printf(m
, "%08x\n", task
->personality
);
2655 static const struct file_operations proc_task_operations
;
2656 static const struct inode_operations proc_task_inode_operations
;
2658 static const struct pid_entry tgid_base_stuff
[] = {
2659 DIR("task", S_IRUGO
|S_IXUGO
, proc_task_inode_operations
, proc_task_operations
),
2660 DIR("fd", S_IRUSR
|S_IXUSR
, proc_fd_inode_operations
, proc_fd_operations
),
2661 DIR("fdinfo", S_IRUSR
|S_IXUSR
, proc_fdinfo_inode_operations
, proc_fdinfo_operations
),
2662 DIR("ns", S_IRUSR
|S_IXUGO
, proc_ns_dir_inode_operations
, proc_ns_dir_operations
),
2664 DIR("net", S_IRUGO
|S_IXUGO
, proc_net_inode_operations
, proc_net_operations
),
2666 REG("environ", S_IRUSR
, proc_environ_operations
),
2667 INF("auxv", S_IRUSR
, proc_pid_auxv
),
2668 ONE("status", S_IRUGO
, proc_pid_status
),
2669 ONE("personality", S_IRUGO
, proc_pid_personality
),
2670 INF("limits", S_IRUGO
, proc_pid_limits
),
2671 #ifdef CONFIG_SCHED_DEBUG
2672 REG("sched", S_IRUGO
|S_IWUSR
, proc_pid_sched_operations
),
2674 #ifdef CONFIG_SCHED_AUTOGROUP
2675 REG("autogroup", S_IRUGO
|S_IWUSR
, proc_pid_sched_autogroup_operations
),
2677 REG("comm", S_IRUGO
|S_IWUSR
, proc_pid_set_comm_operations
),
2678 #ifdef CONFIG_HAVE_ARCH_TRACEHOOK
2679 INF("syscall", S_IRUGO
, proc_pid_syscall
),
2681 INF("cmdline", S_IRUGO
, proc_pid_cmdline
),
2682 ONE("stat", S_IRUGO
, proc_tgid_stat
),
2683 ONE("statm", S_IRUGO
, proc_pid_statm
),
2684 REG("maps", S_IRUGO
, proc_maps_operations
),
2686 REG("numa_maps", S_IRUGO
, proc_numa_maps_operations
),
2688 REG("mem", S_IRUSR
|S_IWUSR
, proc_mem_operations
),
2689 LNK("cwd", proc_cwd_link
),
2690 LNK("root", proc_root_link
),
2691 LNK("exe", proc_exe_link
),
2692 REG("mounts", S_IRUGO
, proc_mounts_operations
),
2693 REG("mountinfo", S_IRUGO
, proc_mountinfo_operations
),
2694 REG("mountstats", S_IRUSR
, proc_mountstats_operations
),
2695 #ifdef CONFIG_PROC_PAGE_MONITOR
2696 REG("clear_refs", S_IWUSR
, proc_clear_refs_operations
),
2697 REG("smaps", S_IRUGO
, proc_smaps_operations
),
2698 REG("pagemap", S_IRUGO
, proc_pagemap_operations
),
2700 #ifdef CONFIG_SECURITY
2701 DIR("attr", S_IRUGO
|S_IXUGO
, proc_attr_dir_inode_operations
, proc_attr_dir_operations
),
2703 #ifdef CONFIG_KALLSYMS
2704 INF("wchan", S_IRUGO
, proc_pid_wchan
),
2706 #ifdef CONFIG_STACKTRACE
2707 ONE("stack", S_IRUGO
, proc_pid_stack
),
2709 #ifdef CONFIG_SCHEDSTATS
2710 INF("schedstat", S_IRUGO
, proc_pid_schedstat
),
2712 #ifdef CONFIG_LATENCYTOP
2713 REG("latency", S_IRUGO
, proc_lstats_operations
),
2715 #ifdef CONFIG_PROC_PID_CPUSET
2716 REG("cpuset", S_IRUGO
, proc_cpuset_operations
),
2718 #ifdef CONFIG_CGROUPS
2719 REG("cgroup", S_IRUGO
, proc_cgroup_operations
),
2721 INF("oom_score", S_IRUGO
, proc_oom_score
),
2722 REG("oom_adj", S_IRUGO
|S_IWUSR
, proc_oom_adjust_operations
),
2723 REG("oom_score_adj", S_IRUGO
|S_IWUSR
, proc_oom_score_adj_operations
),
2724 #ifdef CONFIG_AUDITSYSCALL
2725 REG("loginuid", S_IWUSR
|S_IRUGO
, proc_loginuid_operations
),
2726 REG("sessionid", S_IRUGO
, proc_sessionid_operations
),
2728 #ifdef CONFIG_FAULT_INJECTION
2729 REG("make-it-fail", S_IRUGO
|S_IWUSR
, proc_fault_inject_operations
),
2731 #ifdef CONFIG_ELF_CORE
2732 REG("coredump_filter", S_IRUGO
|S_IWUSR
, proc_coredump_filter_operations
),
2734 #ifdef CONFIG_TASK_IO_ACCOUNTING
2735 INF("io", S_IRUSR
, proc_tgid_io_accounting
),
2737 #ifdef CONFIG_HARDWALL
2738 INF("hardwall", S_IRUGO
, proc_pid_hardwall
),
2742 static int proc_tgid_base_readdir(struct file
* filp
,
2743 void * dirent
, filldir_t filldir
)
2745 return proc_pident_readdir(filp
,dirent
,filldir
,
2746 tgid_base_stuff
,ARRAY_SIZE(tgid_base_stuff
));
2749 static const struct file_operations proc_tgid_base_operations
= {
2750 .read
= generic_read_dir
,
2751 .readdir
= proc_tgid_base_readdir
,
2752 .llseek
= default_llseek
,
2755 static struct dentry
*proc_tgid_base_lookup(struct inode
*dir
, struct dentry
*dentry
, struct nameidata
*nd
){
2756 return proc_pident_lookup(dir
, dentry
,
2757 tgid_base_stuff
, ARRAY_SIZE(tgid_base_stuff
));
2760 static const struct inode_operations proc_tgid_base_inode_operations
= {
2761 .lookup
= proc_tgid_base_lookup
,
2762 .getattr
= pid_getattr
,
2763 .setattr
= proc_setattr
,
2766 static void proc_flush_task_mnt(struct vfsmount
*mnt
, pid_t pid
, pid_t tgid
)
2768 struct dentry
*dentry
, *leader
, *dir
;
2769 char buf
[PROC_NUMBUF
];
2773 name
.len
= snprintf(buf
, sizeof(buf
), "%d", pid
);
2774 dentry
= d_hash_and_lookup(mnt
->mnt_root
, &name
);
2776 shrink_dcache_parent(dentry
);
2782 name
.len
= snprintf(buf
, sizeof(buf
), "%d", tgid
);
2783 leader
= d_hash_and_lookup(mnt
->mnt_root
, &name
);
2788 name
.len
= strlen(name
.name
);
2789 dir
= d_hash_and_lookup(leader
, &name
);
2791 goto out_put_leader
;
2794 name
.len
= snprintf(buf
, sizeof(buf
), "%d", pid
);
2795 dentry
= d_hash_and_lookup(dir
, &name
);
2797 shrink_dcache_parent(dentry
);
2810 * proc_flush_task - Remove dcache entries for @task from the /proc dcache.
2811 * @task: task that should be flushed.
2813 * When flushing dentries from proc, one needs to flush them from global
2814 * proc (proc_mnt) and from all the namespaces' procs this task was seen
2815 * in. This call is supposed to do all of this job.
2817 * Looks in the dcache for
2819 * /proc/@tgid/task/@pid
2820 * if either directory is present flushes it and all of it'ts children
2823 * It is safe and reasonable to cache /proc entries for a task until
2824 * that task exits. After that they just clog up the dcache with
2825 * useless entries, possibly causing useful dcache entries to be
2826 * flushed instead. This routine is proved to flush those useless
2827 * dcache entries at process exit time.
2829 * NOTE: This routine is just an optimization so it does not guarantee
2830 * that no dcache entries will exist at process exit time it
2831 * just makes it very unlikely that any will persist.
2834 void proc_flush_task(struct task_struct
*task
)
2837 struct pid
*pid
, *tgid
;
2840 pid
= task_pid(task
);
2841 tgid
= task_tgid(task
);
2843 for (i
= 0; i
<= pid
->level
; i
++) {
2844 upid
= &pid
->numbers
[i
];
2845 proc_flush_task_mnt(upid
->ns
->proc_mnt
, upid
->nr
,
2846 tgid
->numbers
[i
].nr
);
2849 upid
= &pid
->numbers
[pid
->level
];
2851 pid_ns_release_proc(upid
->ns
);
2854 static struct dentry
*proc_pid_instantiate(struct inode
*dir
,
2855 struct dentry
* dentry
,
2856 struct task_struct
*task
, const void *ptr
)
2858 struct dentry
*error
= ERR_PTR(-ENOENT
);
2859 struct inode
*inode
;
2861 inode
= proc_pid_make_inode(dir
->i_sb
, task
);
2865 inode
->i_mode
= S_IFDIR
|S_IRUGO
|S_IXUGO
;
2866 inode
->i_op
= &proc_tgid_base_inode_operations
;
2867 inode
->i_fop
= &proc_tgid_base_operations
;
2868 inode
->i_flags
|=S_IMMUTABLE
;
2870 set_nlink(inode
, 2 + pid_entry_count_dirs(tgid_base_stuff
,
2871 ARRAY_SIZE(tgid_base_stuff
)));
2873 d_set_d_op(dentry
, &pid_dentry_operations
);
2875 d_add(dentry
, inode
);
2876 /* Close the race of the process dying before we return the dentry */
2877 if (pid_revalidate(dentry
, NULL
))
2883 struct dentry
*proc_pid_lookup(struct inode
*dir
, struct dentry
* dentry
, struct nameidata
*nd
)
2885 struct dentry
*result
;
2886 struct task_struct
*task
;
2888 struct pid_namespace
*ns
;
2890 result
= proc_base_lookup(dir
, dentry
);
2891 if (!IS_ERR(result
) || PTR_ERR(result
) != -ENOENT
)
2894 tgid
= name_to_int(dentry
);
2898 ns
= dentry
->d_sb
->s_fs_info
;
2900 task
= find_task_by_pid_ns(tgid
, ns
);
2902 get_task_struct(task
);
2907 result
= proc_pid_instantiate(dir
, dentry
, task
, NULL
);
2908 put_task_struct(task
);
2914 * Find the first task with tgid >= tgid
2919 struct task_struct
*task
;
2921 static struct tgid_iter
next_tgid(struct pid_namespace
*ns
, struct tgid_iter iter
)
2926 put_task_struct(iter
.task
);
2930 pid
= find_ge_pid(iter
.tgid
, ns
);
2932 iter
.tgid
= pid_nr_ns(pid
, ns
);
2933 iter
.task
= pid_task(pid
, PIDTYPE_PID
);
2934 /* What we to know is if the pid we have find is the
2935 * pid of a thread_group_leader. Testing for task
2936 * being a thread_group_leader is the obvious thing
2937 * todo but there is a window when it fails, due to
2938 * the pid transfer logic in de_thread.
2940 * So we perform the straight forward test of seeing
2941 * if the pid we have found is the pid of a thread
2942 * group leader, and don't worry if the task we have
2943 * found doesn't happen to be a thread group leader.
2944 * As we don't care in the case of readdir.
2946 if (!iter
.task
|| !has_group_leader_pid(iter
.task
)) {
2950 get_task_struct(iter
.task
);
2956 #define TGID_OFFSET (FIRST_PROCESS_ENTRY + ARRAY_SIZE(proc_base_stuff))
2958 static int proc_pid_fill_cache(struct file
*filp
, void *dirent
, filldir_t filldir
,
2959 struct tgid_iter iter
)
2961 char name
[PROC_NUMBUF
];
2962 int len
= snprintf(name
, sizeof(name
), "%d", iter
.tgid
);
2963 return proc_fill_cache(filp
, dirent
, filldir
, name
, len
,
2964 proc_pid_instantiate
, iter
.task
, NULL
);
2967 /* for the /proc/ directory itself, after non-process stuff has been done */
2968 int proc_pid_readdir(struct file
* filp
, void * dirent
, filldir_t filldir
)
2971 struct task_struct
*reaper
;
2972 struct tgid_iter iter
;
2973 struct pid_namespace
*ns
;
2975 if (filp
->f_pos
>= PID_MAX_LIMIT
+ TGID_OFFSET
)
2977 nr
= filp
->f_pos
- FIRST_PROCESS_ENTRY
;
2979 reaper
= get_proc_task(filp
->f_path
.dentry
->d_inode
);
2983 for (; nr
< ARRAY_SIZE(proc_base_stuff
); filp
->f_pos
++, nr
++) {
2984 const struct pid_entry
*p
= &proc_base_stuff
[nr
];
2985 if (proc_base_fill_cache(filp
, dirent
, filldir
, reaper
, p
) < 0)
2989 ns
= filp
->f_dentry
->d_sb
->s_fs_info
;
2991 iter
.tgid
= filp
->f_pos
- TGID_OFFSET
;
2992 for (iter
= next_tgid(ns
, iter
);
2994 iter
.tgid
+= 1, iter
= next_tgid(ns
, iter
)) {
2995 filp
->f_pos
= iter
.tgid
+ TGID_OFFSET
;
2996 if (proc_pid_fill_cache(filp
, dirent
, filldir
, iter
) < 0) {
2997 put_task_struct(iter
.task
);
3001 filp
->f_pos
= PID_MAX_LIMIT
+ TGID_OFFSET
;
3003 put_task_struct(reaper
);
3011 static const struct pid_entry tid_base_stuff
[] = {
3012 DIR("fd", S_IRUSR
|S_IXUSR
, proc_fd_inode_operations
, proc_fd_operations
),
3013 DIR("fdinfo", S_IRUSR
|S_IXUSR
, proc_fdinfo_inode_operations
, proc_fdinfo_operations
),
3014 DIR("ns", S_IRUSR
|S_IXUGO
, proc_ns_dir_inode_operations
, proc_ns_dir_operations
),
3015 REG("environ", S_IRUSR
, proc_environ_operations
),
3016 INF("auxv", S_IRUSR
, proc_pid_auxv
),
3017 ONE("status", S_IRUGO
, proc_pid_status
),
3018 ONE("personality", S_IRUGO
, proc_pid_personality
),
3019 INF("limits", S_IRUGO
, proc_pid_limits
),
3020 #ifdef CONFIG_SCHED_DEBUG
3021 REG("sched", S_IRUGO
|S_IWUSR
, proc_pid_sched_operations
),
3023 REG("comm", S_IRUGO
|S_IWUSR
, proc_pid_set_comm_operations
),
3024 #ifdef CONFIG_HAVE_ARCH_TRACEHOOK
3025 INF("syscall", S_IRUGO
, proc_pid_syscall
),
3027 INF("cmdline", S_IRUGO
, proc_pid_cmdline
),
3028 ONE("stat", S_IRUGO
, proc_tid_stat
),
3029 ONE("statm", S_IRUGO
, proc_pid_statm
),
3030 REG("maps", S_IRUGO
, proc_maps_operations
),
3032 REG("numa_maps", S_IRUGO
, proc_numa_maps_operations
),
3034 REG("mem", S_IRUSR
|S_IWUSR
, proc_mem_operations
),
3035 LNK("cwd", proc_cwd_link
),
3036 LNK("root", proc_root_link
),
3037 LNK("exe", proc_exe_link
),
3038 REG("mounts", S_IRUGO
, proc_mounts_operations
),
3039 REG("mountinfo", S_IRUGO
, proc_mountinfo_operations
),
3040 #ifdef CONFIG_PROC_PAGE_MONITOR
3041 REG("clear_refs", S_IWUSR
, proc_clear_refs_operations
),
3042 REG("smaps", S_IRUGO
, proc_smaps_operations
),
3043 REG("pagemap", S_IRUGO
, proc_pagemap_operations
),
3045 #ifdef CONFIG_SECURITY
3046 DIR("attr", S_IRUGO
|S_IXUGO
, proc_attr_dir_inode_operations
, proc_attr_dir_operations
),
3048 #ifdef CONFIG_KALLSYMS
3049 INF("wchan", S_IRUGO
, proc_pid_wchan
),
3051 #ifdef CONFIG_STACKTRACE
3052 ONE("stack", S_IRUGO
, proc_pid_stack
),
3054 #ifdef CONFIG_SCHEDSTATS
3055 INF("schedstat", S_IRUGO
, proc_pid_schedstat
),
3057 #ifdef CONFIG_LATENCYTOP
3058 REG("latency", S_IRUGO
, proc_lstats_operations
),
3060 #ifdef CONFIG_PROC_PID_CPUSET
3061 REG("cpuset", S_IRUGO
, proc_cpuset_operations
),
3063 #ifdef CONFIG_CGROUPS
3064 REG("cgroup", S_IRUGO
, proc_cgroup_operations
),
3066 INF("oom_score", S_IRUGO
, proc_oom_score
),
3067 REG("oom_adj", S_IRUGO
|S_IWUSR
, proc_oom_adjust_operations
),
3068 REG("oom_score_adj", S_IRUGO
|S_IWUSR
, proc_oom_score_adj_operations
),
3069 #ifdef CONFIG_AUDITSYSCALL
3070 REG("loginuid", S_IWUSR
|S_IRUGO
, proc_loginuid_operations
),
3071 REG("sessionid", S_IRUGO
, proc_sessionid_operations
),
3073 #ifdef CONFIG_FAULT_INJECTION
3074 REG("make-it-fail", S_IRUGO
|S_IWUSR
, proc_fault_inject_operations
),
3076 #ifdef CONFIG_TASK_IO_ACCOUNTING
3077 INF("io", S_IRUSR
, proc_tid_io_accounting
),
3079 #ifdef CONFIG_HARDWALL
3080 INF("hardwall", S_IRUGO
, proc_pid_hardwall
),
3084 static int proc_tid_base_readdir(struct file
* filp
,
3085 void * dirent
, filldir_t filldir
)
3087 return proc_pident_readdir(filp
,dirent
,filldir
,
3088 tid_base_stuff
,ARRAY_SIZE(tid_base_stuff
));
3091 static struct dentry
*proc_tid_base_lookup(struct inode
*dir
, struct dentry
*dentry
, struct nameidata
*nd
){
3092 return proc_pident_lookup(dir
, dentry
,
3093 tid_base_stuff
, ARRAY_SIZE(tid_base_stuff
));
3096 static const struct file_operations proc_tid_base_operations
= {
3097 .read
= generic_read_dir
,
3098 .readdir
= proc_tid_base_readdir
,
3099 .llseek
= default_llseek
,
3102 static const struct inode_operations proc_tid_base_inode_operations
= {
3103 .lookup
= proc_tid_base_lookup
,
3104 .getattr
= pid_getattr
,
3105 .setattr
= proc_setattr
,
3108 static struct dentry
*proc_task_instantiate(struct inode
*dir
,
3109 struct dentry
*dentry
, struct task_struct
*task
, const void *ptr
)
3111 struct dentry
*error
= ERR_PTR(-ENOENT
);
3112 struct inode
*inode
;
3113 inode
= proc_pid_make_inode(dir
->i_sb
, task
);
3117 inode
->i_mode
= S_IFDIR
|S_IRUGO
|S_IXUGO
;
3118 inode
->i_op
= &proc_tid_base_inode_operations
;
3119 inode
->i_fop
= &proc_tid_base_operations
;
3120 inode
->i_flags
|=S_IMMUTABLE
;
3122 set_nlink(inode
, 2 + pid_entry_count_dirs(tid_base_stuff
,
3123 ARRAY_SIZE(tid_base_stuff
)));
3125 d_set_d_op(dentry
, &pid_dentry_operations
);
3127 d_add(dentry
, inode
);
3128 /* Close the race of the process dying before we return the dentry */
3129 if (pid_revalidate(dentry
, NULL
))
3135 static struct dentry
*proc_task_lookup(struct inode
*dir
, struct dentry
* dentry
, struct nameidata
*nd
)
3137 struct dentry
*result
= ERR_PTR(-ENOENT
);
3138 struct task_struct
*task
;
3139 struct task_struct
*leader
= get_proc_task(dir
);
3141 struct pid_namespace
*ns
;
3146 tid
= name_to_int(dentry
);
3150 ns
= dentry
->d_sb
->s_fs_info
;
3152 task
= find_task_by_pid_ns(tid
, ns
);
3154 get_task_struct(task
);
3158 if (!same_thread_group(leader
, task
))
3161 result
= proc_task_instantiate(dir
, dentry
, task
, NULL
);
3163 put_task_struct(task
);
3165 put_task_struct(leader
);
3171 * Find the first tid of a thread group to return to user space.
3173 * Usually this is just the thread group leader, but if the users
3174 * buffer was too small or there was a seek into the middle of the
3175 * directory we have more work todo.
3177 * In the case of a short read we start with find_task_by_pid.
3179 * In the case of a seek we start with the leader and walk nr
3182 static struct task_struct
*first_tid(struct task_struct
*leader
,
3183 int tid
, int nr
, struct pid_namespace
*ns
)
3185 struct task_struct
*pos
;
3188 /* Attempt to start with the pid of a thread */
3189 if (tid
&& (nr
> 0)) {
3190 pos
= find_task_by_pid_ns(tid
, ns
);
3191 if (pos
&& (pos
->group_leader
== leader
))
3195 /* If nr exceeds the number of threads there is nothing todo */
3197 if (nr
&& nr
>= get_nr_threads(leader
))
3200 /* If we haven't found our starting place yet start
3201 * with the leader and walk nr threads forward.
3203 for (pos
= leader
; nr
> 0; --nr
) {
3204 pos
= next_thread(pos
);
3205 if (pos
== leader
) {
3211 get_task_struct(pos
);
3218 * Find the next thread in the thread list.
3219 * Return NULL if there is an error or no next thread.
3221 * The reference to the input task_struct is released.
3223 static struct task_struct
*next_tid(struct task_struct
*start
)
3225 struct task_struct
*pos
= NULL
;
3227 if (pid_alive(start
)) {
3228 pos
= next_thread(start
);
3229 if (thread_group_leader(pos
))
3232 get_task_struct(pos
);
3235 put_task_struct(start
);
3239 static int proc_task_fill_cache(struct file
*filp
, void *dirent
, filldir_t filldir
,
3240 struct task_struct
*task
, int tid
)
3242 char name
[PROC_NUMBUF
];
3243 int len
= snprintf(name
, sizeof(name
), "%d", tid
);
3244 return proc_fill_cache(filp
, dirent
, filldir
, name
, len
,
3245 proc_task_instantiate
, task
, NULL
);
3248 /* for the /proc/TGID/task/ directories */
3249 static int proc_task_readdir(struct file
* filp
, void * dirent
, filldir_t filldir
)
3251 struct dentry
*dentry
= filp
->f_path
.dentry
;
3252 struct inode
*inode
= dentry
->d_inode
;
3253 struct task_struct
*leader
= NULL
;
3254 struct task_struct
*task
;
3255 int retval
= -ENOENT
;
3258 struct pid_namespace
*ns
;
3260 task
= get_proc_task(inode
);
3264 if (pid_alive(task
)) {
3265 leader
= task
->group_leader
;
3266 get_task_struct(leader
);
3269 put_task_struct(task
);
3274 switch ((unsigned long)filp
->f_pos
) {
3277 if (filldir(dirent
, ".", 1, filp
->f_pos
, ino
, DT_DIR
) < 0)
3282 ino
= parent_ino(dentry
);
3283 if (filldir(dirent
, "..", 2, filp
->f_pos
, ino
, DT_DIR
) < 0)
3289 /* f_version caches the tgid value that the last readdir call couldn't
3290 * return. lseek aka telldir automagically resets f_version to 0.
3292 ns
= filp
->f_dentry
->d_sb
->s_fs_info
;
3293 tid
= (int)filp
->f_version
;
3294 filp
->f_version
= 0;
3295 for (task
= first_tid(leader
, tid
, filp
->f_pos
- 2, ns
);
3297 task
= next_tid(task
), filp
->f_pos
++) {
3298 tid
= task_pid_nr_ns(task
, ns
);
3299 if (proc_task_fill_cache(filp
, dirent
, filldir
, task
, tid
) < 0) {
3300 /* returning this tgid failed, save it as the first
3301 * pid for the next readir call */
3302 filp
->f_version
= (u64
)tid
;
3303 put_task_struct(task
);
3308 put_task_struct(leader
);
3313 static int proc_task_getattr(struct vfsmount
*mnt
, struct dentry
*dentry
, struct kstat
*stat
)
3315 struct inode
*inode
= dentry
->d_inode
;
3316 struct task_struct
*p
= get_proc_task(inode
);
3317 generic_fillattr(inode
, stat
);
3320 stat
->nlink
+= get_nr_threads(p
);
3327 static const struct inode_operations proc_task_inode_operations
= {
3328 .lookup
= proc_task_lookup
,
3329 .getattr
= proc_task_getattr
,
3330 .setattr
= proc_setattr
,
3333 static const struct file_operations proc_task_operations
= {
3334 .read
= generic_read_dir
,
3335 .readdir
= proc_task_readdir
,
3336 .llseek
= default_llseek
,