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/rcupdate.h>
67 #include <linux/kallsyms.h>
68 #include <linux/stacktrace.h>
69 #include <linux/resource.h>
70 #include <linux/module.h>
71 #include <linux/mount.h>
72 #include <linux/security.h>
73 #include <linux/ptrace.h>
74 #include <linux/tracehook.h>
75 #include <linux/cgroup.h>
76 #include <linux/cpuset.h>
77 #include <linux/audit.h>
78 #include <linux/poll.h>
79 #include <linux/nsproxy.h>
80 #include <linux/oom.h>
81 #include <linux/elf.h>
82 #include <linux/pid_namespace.h>
83 #include <linux/fs_struct.h>
87 * Implementing inode permission operations in /proc is almost
88 * certainly an error. Permission checks need to happen during
89 * each system call not at open time. The reason is that most of
90 * what we wish to check for permissions in /proc varies at runtime.
92 * The classic example of a problem is opening file descriptors
93 * in /proc for a task before it execs a suid executable.
100 const struct inode_operations
*iop
;
101 const struct file_operations
*fop
;
105 #define NOD(NAME, MODE, IOP, FOP, OP) { \
107 .len = sizeof(NAME) - 1, \
114 #define DIR(NAME, MODE, iops, fops) \
115 NOD(NAME, (S_IFDIR|(MODE)), &iops, &fops, {} )
116 #define LNK(NAME, get_link) \
117 NOD(NAME, (S_IFLNK|S_IRWXUGO), \
118 &proc_pid_link_inode_operations, NULL, \
119 { .proc_get_link = get_link } )
120 #define REG(NAME, MODE, fops) \
121 NOD(NAME, (S_IFREG|(MODE)), NULL, &fops, {})
122 #define INF(NAME, MODE, read) \
123 NOD(NAME, (S_IFREG|(MODE)), \
124 NULL, &proc_info_file_operations, \
125 { .proc_read = read } )
126 #define ONE(NAME, MODE, show) \
127 NOD(NAME, (S_IFREG|(MODE)), \
128 NULL, &proc_single_file_operations, \
129 { .proc_show = show } )
132 * Count the number of hardlinks for the pid_entry table, excluding the .
135 static unsigned int pid_entry_count_dirs(const struct pid_entry
*entries
,
142 for (i
= 0; i
< n
; ++i
) {
143 if (S_ISDIR(entries
[i
].mode
))
150 static int get_fs_path(struct task_struct
*task
, struct path
*path
, bool root
)
152 struct fs_struct
*fs
;
153 int result
= -ENOENT
;
158 read_lock(&fs
->lock
);
159 *path
= root
? fs
->root
: fs
->pwd
;
161 read_unlock(&fs
->lock
);
168 static int get_nr_threads(struct task_struct
*tsk
)
173 if (lock_task_sighand(tsk
, &flags
)) {
174 count
= atomic_read(&tsk
->signal
->count
);
175 unlock_task_sighand(tsk
, &flags
);
180 static int proc_cwd_link(struct inode
*inode
, struct path
*path
)
182 struct task_struct
*task
= get_proc_task(inode
);
183 int result
= -ENOENT
;
186 result
= get_fs_path(task
, path
, 0);
187 put_task_struct(task
);
192 static int proc_root_link(struct inode
*inode
, struct path
*path
)
194 struct task_struct
*task
= get_proc_task(inode
);
195 int result
= -ENOENT
;
198 result
= get_fs_path(task
, path
, 1);
199 put_task_struct(task
);
205 * Return zero if current may access user memory in @task, -error if not.
207 static int check_mem_permission(struct task_struct
*task
)
210 * A task can always look at itself, in case it chooses
211 * to use system calls instead of load instructions.
217 * If current is actively ptrace'ing, and would also be
218 * permitted to freshly attach with ptrace now, permit it.
220 if (task_is_stopped_or_traced(task
)) {
223 match
= (tracehook_tracer_task(task
) == current
);
225 if (match
&& ptrace_may_access(task
, PTRACE_MODE_ATTACH
))
230 * Noone else is allowed.
235 struct mm_struct
*mm_for_maps(struct task_struct
*task
)
237 struct mm_struct
*mm
= get_task_mm(task
);
240 if (mm
!= current
->mm
) {
242 * task->mm can be changed before security check,
243 * in that case we must notice the change after.
245 if (!ptrace_may_access(task
, PTRACE_MODE_READ
) ||
251 down_read(&mm
->mmap_sem
);
255 static int proc_pid_cmdline(struct task_struct
*task
, char * buffer
)
259 struct mm_struct
*mm
= get_task_mm(task
);
263 goto out_mm
; /* Shh! No looking before we're done */
265 len
= mm
->arg_end
- mm
->arg_start
;
270 res
= access_process_vm(task
, mm
->arg_start
, buffer
, len
, 0);
272 // If the nul at the end of args has been overwritten, then
273 // assume application is using setproctitle(3).
274 if (res
> 0 && buffer
[res
-1] != '\0' && len
< PAGE_SIZE
) {
275 len
= strnlen(buffer
, res
);
279 len
= mm
->env_end
- mm
->env_start
;
280 if (len
> PAGE_SIZE
- res
)
281 len
= PAGE_SIZE
- res
;
282 res
+= access_process_vm(task
, mm
->env_start
, buffer
+res
, len
, 0);
283 res
= strnlen(buffer
, res
);
292 static int proc_pid_auxv(struct task_struct
*task
, char *buffer
)
295 struct mm_struct
*mm
= get_task_mm(task
);
297 unsigned int nwords
= 0;
300 } while (mm
->saved_auxv
[nwords
- 2] != 0); /* AT_NULL */
301 res
= nwords
* sizeof(mm
->saved_auxv
[0]);
304 memcpy(buffer
, mm
->saved_auxv
, res
);
311 #ifdef CONFIG_KALLSYMS
313 * Provides a wchan file via kallsyms in a proper one-value-per-file format.
314 * Returns the resolved symbol. If that fails, simply return the address.
316 static int proc_pid_wchan(struct task_struct
*task
, char *buffer
)
319 char symname
[KSYM_NAME_LEN
];
321 wchan
= get_wchan(task
);
323 if (lookup_symbol_name(wchan
, symname
) < 0)
324 if (!ptrace_may_access(task
, PTRACE_MODE_READ
))
327 return sprintf(buffer
, "%lu", wchan
);
329 return sprintf(buffer
, "%s", symname
);
331 #endif /* CONFIG_KALLSYMS */
333 #ifdef CONFIG_STACKTRACE
335 #define MAX_STACK_TRACE_DEPTH 64
337 static int proc_pid_stack(struct seq_file
*m
, struct pid_namespace
*ns
,
338 struct pid
*pid
, struct task_struct
*task
)
340 struct stack_trace trace
;
341 unsigned long *entries
;
344 entries
= kmalloc(MAX_STACK_TRACE_DEPTH
* sizeof(*entries
), GFP_KERNEL
);
348 trace
.nr_entries
= 0;
349 trace
.max_entries
= MAX_STACK_TRACE_DEPTH
;
350 trace
.entries
= entries
;
352 save_stack_trace_tsk(task
, &trace
);
354 for (i
= 0; i
< trace
.nr_entries
; i
++) {
355 seq_printf(m
, "[<%p>] %pS\n",
356 (void *)entries
[i
], (void *)entries
[i
]);
364 #ifdef CONFIG_SCHEDSTATS
366 * Provides /proc/PID/schedstat
368 static int proc_pid_schedstat(struct task_struct
*task
, char *buffer
)
370 return sprintf(buffer
, "%llu %llu %lu\n",
371 (unsigned long long)task
->se
.sum_exec_runtime
,
372 (unsigned long long)task
->sched_info
.run_delay
,
373 task
->sched_info
.pcount
);
377 #ifdef CONFIG_LATENCYTOP
378 static int lstats_show_proc(struct seq_file
*m
, void *v
)
381 struct inode
*inode
= m
->private;
382 struct task_struct
*task
= get_proc_task(inode
);
386 seq_puts(m
, "Latency Top version : v0.1\n");
387 for (i
= 0; i
< 32; i
++) {
388 if (task
->latency_record
[i
].backtrace
[0]) {
390 seq_printf(m
, "%i %li %li ",
391 task
->latency_record
[i
].count
,
392 task
->latency_record
[i
].time
,
393 task
->latency_record
[i
].max
);
394 for (q
= 0; q
< LT_BACKTRACEDEPTH
; q
++) {
395 char sym
[KSYM_SYMBOL_LEN
];
397 if (!task
->latency_record
[i
].backtrace
[q
])
399 if (task
->latency_record
[i
].backtrace
[q
] == ULONG_MAX
)
401 sprint_symbol(sym
, task
->latency_record
[i
].backtrace
[q
]);
402 c
= strchr(sym
, '+');
405 seq_printf(m
, "%s ", sym
);
411 put_task_struct(task
);
415 static int lstats_open(struct inode
*inode
, struct file
*file
)
417 return single_open(file
, lstats_show_proc
, inode
);
420 static ssize_t
lstats_write(struct file
*file
, const char __user
*buf
,
421 size_t count
, loff_t
*offs
)
423 struct task_struct
*task
= get_proc_task(file
->f_dentry
->d_inode
);
427 clear_all_latency_tracing(task
);
428 put_task_struct(task
);
433 static const struct file_operations proc_lstats_operations
= {
436 .write
= lstats_write
,
438 .release
= single_release
,
443 /* The badness from the OOM killer */
444 unsigned long badness(struct task_struct
*p
, unsigned long uptime
);
445 static int proc_oom_score(struct task_struct
*task
, char *buffer
)
447 unsigned long points
;
448 struct timespec uptime
;
450 do_posix_clock_monotonic_gettime(&uptime
);
451 read_lock(&tasklist_lock
);
452 points
= badness(task
, uptime
.tv_sec
);
453 read_unlock(&tasklist_lock
);
454 return sprintf(buffer
, "%lu\n", points
);
462 static const struct limit_names lnames
[RLIM_NLIMITS
] = {
463 [RLIMIT_CPU
] = {"Max cpu time", "ms"},
464 [RLIMIT_FSIZE
] = {"Max file size", "bytes"},
465 [RLIMIT_DATA
] = {"Max data size", "bytes"},
466 [RLIMIT_STACK
] = {"Max stack size", "bytes"},
467 [RLIMIT_CORE
] = {"Max core file size", "bytes"},
468 [RLIMIT_RSS
] = {"Max resident set", "bytes"},
469 [RLIMIT_NPROC
] = {"Max processes", "processes"},
470 [RLIMIT_NOFILE
] = {"Max open files", "files"},
471 [RLIMIT_MEMLOCK
] = {"Max locked memory", "bytes"},
472 [RLIMIT_AS
] = {"Max address space", "bytes"},
473 [RLIMIT_LOCKS
] = {"Max file locks", "locks"},
474 [RLIMIT_SIGPENDING
] = {"Max pending signals", "signals"},
475 [RLIMIT_MSGQUEUE
] = {"Max msgqueue size", "bytes"},
476 [RLIMIT_NICE
] = {"Max nice priority", NULL
},
477 [RLIMIT_RTPRIO
] = {"Max realtime priority", NULL
},
478 [RLIMIT_RTTIME
] = {"Max realtime timeout", "us"},
481 /* Display limits for a process */
482 static int proc_pid_limits(struct task_struct
*task
, char *buffer
)
487 char *bufptr
= buffer
;
489 struct rlimit rlim
[RLIM_NLIMITS
];
491 if (!lock_task_sighand(task
, &flags
))
493 memcpy(rlim
, task
->signal
->rlim
, sizeof(struct rlimit
) * RLIM_NLIMITS
);
494 unlock_task_sighand(task
, &flags
);
497 * print the file header
499 count
+= sprintf(&bufptr
[count
], "%-25s %-20s %-20s %-10s\n",
500 "Limit", "Soft Limit", "Hard Limit", "Units");
502 for (i
= 0; i
< RLIM_NLIMITS
; i
++) {
503 if (rlim
[i
].rlim_cur
== RLIM_INFINITY
)
504 count
+= sprintf(&bufptr
[count
], "%-25s %-20s ",
505 lnames
[i
].name
, "unlimited");
507 count
+= sprintf(&bufptr
[count
], "%-25s %-20lu ",
508 lnames
[i
].name
, rlim
[i
].rlim_cur
);
510 if (rlim
[i
].rlim_max
== RLIM_INFINITY
)
511 count
+= sprintf(&bufptr
[count
], "%-20s ", "unlimited");
513 count
+= sprintf(&bufptr
[count
], "%-20lu ",
517 count
+= sprintf(&bufptr
[count
], "%-10s\n",
520 count
+= sprintf(&bufptr
[count
], "\n");
526 #ifdef CONFIG_HAVE_ARCH_TRACEHOOK
527 static int proc_pid_syscall(struct task_struct
*task
, char *buffer
)
530 unsigned long args
[6], sp
, pc
;
532 if (task_current_syscall(task
, &nr
, args
, 6, &sp
, &pc
))
533 return sprintf(buffer
, "running\n");
536 return sprintf(buffer
, "%ld 0x%lx 0x%lx\n", nr
, sp
, pc
);
538 return sprintf(buffer
,
539 "%ld 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx\n",
541 args
[0], args
[1], args
[2], args
[3], args
[4], args
[5],
544 #endif /* CONFIG_HAVE_ARCH_TRACEHOOK */
546 /************************************************************************/
547 /* Here the fs part begins */
548 /************************************************************************/
550 /* permission checks */
551 static int proc_fd_access_allowed(struct inode
*inode
)
553 struct task_struct
*task
;
555 /* Allow access to a task's file descriptors if it is us or we
556 * may use ptrace attach to the process and find out that
559 task
= get_proc_task(inode
);
561 allowed
= ptrace_may_access(task
, PTRACE_MODE_READ
);
562 put_task_struct(task
);
567 static int proc_setattr(struct dentry
*dentry
, struct iattr
*attr
)
570 struct inode
*inode
= dentry
->d_inode
;
572 if (attr
->ia_valid
& ATTR_MODE
)
575 error
= inode_change_ok(inode
, attr
);
577 error
= inode_setattr(inode
, attr
);
581 static const struct inode_operations proc_def_inode_operations
= {
582 .setattr
= proc_setattr
,
585 static int mounts_open_common(struct inode
*inode
, struct file
*file
,
586 const struct seq_operations
*op
)
588 struct task_struct
*task
= get_proc_task(inode
);
590 struct mnt_namespace
*ns
= NULL
;
592 struct proc_mounts
*p
;
597 nsp
= task_nsproxy(task
);
604 if (ns
&& get_fs_path(task
, &root
, 1) == 0)
606 put_task_struct(task
);
615 p
= kmalloc(sizeof(struct proc_mounts
), GFP_KERNEL
);
619 file
->private_data
= &p
->m
;
620 ret
= seq_open(file
, op
);
627 p
->event
= ns
->event
;
641 static int mounts_release(struct inode
*inode
, struct file
*file
)
643 struct proc_mounts
*p
= file
->private_data
;
646 return seq_release(inode
, file
);
649 static unsigned mounts_poll(struct file
*file
, poll_table
*wait
)
651 struct proc_mounts
*p
= file
->private_data
;
652 struct mnt_namespace
*ns
= p
->ns
;
653 unsigned res
= POLLIN
| POLLRDNORM
;
655 poll_wait(file
, &ns
->poll
, wait
);
657 spin_lock(&vfsmount_lock
);
658 if (p
->event
!= ns
->event
) {
659 p
->event
= ns
->event
;
660 res
|= POLLERR
| POLLPRI
;
662 spin_unlock(&vfsmount_lock
);
667 static int mounts_open(struct inode
*inode
, struct file
*file
)
669 return mounts_open_common(inode
, file
, &mounts_op
);
672 static const struct file_operations proc_mounts_operations
= {
676 .release
= mounts_release
,
680 static int mountinfo_open(struct inode
*inode
, struct file
*file
)
682 return mounts_open_common(inode
, file
, &mountinfo_op
);
685 static const struct file_operations proc_mountinfo_operations
= {
686 .open
= mountinfo_open
,
689 .release
= mounts_release
,
693 static int mountstats_open(struct inode
*inode
, struct file
*file
)
695 return mounts_open_common(inode
, file
, &mountstats_op
);
698 static const struct file_operations proc_mountstats_operations
= {
699 .open
= mountstats_open
,
702 .release
= mounts_release
,
705 #define PROC_BLOCK_SIZE (3*1024) /* 4K page size but our output routines use some slack for overruns */
707 static ssize_t
proc_info_read(struct file
* file
, char __user
* buf
,
708 size_t count
, loff_t
*ppos
)
710 struct inode
* inode
= file
->f_path
.dentry
->d_inode
;
713 struct task_struct
*task
= get_proc_task(inode
);
719 if (count
> PROC_BLOCK_SIZE
)
720 count
= PROC_BLOCK_SIZE
;
723 if (!(page
= __get_free_page(GFP_TEMPORARY
)))
726 length
= PROC_I(inode
)->op
.proc_read(task
, (char*)page
);
729 length
= simple_read_from_buffer(buf
, count
, ppos
, (char *)page
, length
);
732 put_task_struct(task
);
737 static const struct file_operations proc_info_file_operations
= {
738 .read
= proc_info_read
,
741 static int proc_single_show(struct seq_file
*m
, void *v
)
743 struct inode
*inode
= m
->private;
744 struct pid_namespace
*ns
;
746 struct task_struct
*task
;
749 ns
= inode
->i_sb
->s_fs_info
;
750 pid
= proc_pid(inode
);
751 task
= get_pid_task(pid
, PIDTYPE_PID
);
755 ret
= PROC_I(inode
)->op
.proc_show(m
, ns
, pid
, task
);
757 put_task_struct(task
);
761 static int proc_single_open(struct inode
*inode
, struct file
*filp
)
764 ret
= single_open(filp
, proc_single_show
, NULL
);
766 struct seq_file
*m
= filp
->private_data
;
773 static const struct file_operations proc_single_file_operations
= {
774 .open
= proc_single_open
,
777 .release
= single_release
,
780 static int mem_open(struct inode
* inode
, struct file
* file
)
782 file
->private_data
= (void*)((long)current
->self_exec_id
);
786 static ssize_t
mem_read(struct file
* file
, char __user
* buf
,
787 size_t count
, loff_t
*ppos
)
789 struct task_struct
*task
= get_proc_task(file
->f_path
.dentry
->d_inode
);
791 unsigned long src
= *ppos
;
793 struct mm_struct
*mm
;
798 if (check_mem_permission(task
))
802 page
= (char *)__get_free_page(GFP_TEMPORARY
);
808 mm
= get_task_mm(task
);
814 if (file
->private_data
!= (void*)((long)current
->self_exec_id
))
820 int this_len
, retval
;
822 this_len
= (count
> PAGE_SIZE
) ? PAGE_SIZE
: count
;
823 retval
= access_process_vm(task
, src
, page
, this_len
, 0);
824 if (!retval
|| check_mem_permission(task
)) {
830 if (copy_to_user(buf
, page
, retval
)) {
845 free_page((unsigned long) page
);
847 put_task_struct(task
);
852 #define mem_write NULL
855 /* This is a security hazard */
856 static ssize_t
mem_write(struct file
* file
, const char __user
*buf
,
857 size_t count
, loff_t
*ppos
)
861 struct task_struct
*task
= get_proc_task(file
->f_path
.dentry
->d_inode
);
862 unsigned long dst
= *ppos
;
868 if (check_mem_permission(task
))
872 page
= (char *)__get_free_page(GFP_TEMPORARY
);
878 int this_len
, retval
;
880 this_len
= (count
> PAGE_SIZE
) ? PAGE_SIZE
: count
;
881 if (copy_from_user(page
, buf
, this_len
)) {
885 retval
= access_process_vm(task
, dst
, page
, this_len
, 1);
897 free_page((unsigned long) page
);
899 put_task_struct(task
);
905 loff_t
mem_lseek(struct file
*file
, loff_t offset
, int orig
)
909 file
->f_pos
= offset
;
912 file
->f_pos
+= offset
;
917 force_successful_syscall_return();
921 static const struct file_operations proc_mem_operations
= {
928 static ssize_t
environ_read(struct file
*file
, char __user
*buf
,
929 size_t count
, loff_t
*ppos
)
931 struct task_struct
*task
= get_proc_task(file
->f_dentry
->d_inode
);
933 unsigned long src
= *ppos
;
935 struct mm_struct
*mm
;
940 if (!ptrace_may_access(task
, PTRACE_MODE_READ
))
944 page
= (char *)__get_free_page(GFP_TEMPORARY
);
950 mm
= get_task_mm(task
);
955 int this_len
, retval
, max_len
;
957 this_len
= mm
->env_end
- (mm
->env_start
+ src
);
962 max_len
= (count
> PAGE_SIZE
) ? PAGE_SIZE
: count
;
963 this_len
= (this_len
> max_len
) ? max_len
: this_len
;
965 retval
= access_process_vm(task
, (mm
->env_start
+ src
),
973 if (copy_to_user(buf
, page
, retval
)) {
987 free_page((unsigned long) page
);
989 put_task_struct(task
);
994 static const struct file_operations proc_environ_operations
= {
995 .read
= environ_read
,
998 static ssize_t
oom_adjust_read(struct file
*file
, char __user
*buf
,
999 size_t count
, loff_t
*ppos
)
1001 struct task_struct
*task
= get_proc_task(file
->f_path
.dentry
->d_inode
);
1002 char buffer
[PROC_NUMBUF
];
1010 oom_adjust
= task
->mm
->oom_adj
;
1012 oom_adjust
= OOM_DISABLE
;
1014 put_task_struct(task
);
1016 len
= snprintf(buffer
, sizeof(buffer
), "%i\n", oom_adjust
);
1018 return simple_read_from_buffer(buf
, count
, ppos
, buffer
, len
);
1021 static ssize_t
oom_adjust_write(struct file
*file
, const char __user
*buf
,
1022 size_t count
, loff_t
*ppos
)
1024 struct task_struct
*task
;
1025 char buffer
[PROC_NUMBUF
], *end
;
1028 memset(buffer
, 0, sizeof(buffer
));
1029 if (count
> sizeof(buffer
) - 1)
1030 count
= sizeof(buffer
) - 1;
1031 if (copy_from_user(buffer
, buf
, count
))
1033 oom_adjust
= simple_strtol(buffer
, &end
, 0);
1034 if ((oom_adjust
< OOM_ADJUST_MIN
|| oom_adjust
> OOM_ADJUST_MAX
) &&
1035 oom_adjust
!= OOM_DISABLE
)
1039 task
= get_proc_task(file
->f_path
.dentry
->d_inode
);
1045 put_task_struct(task
);
1048 if (oom_adjust
< task
->mm
->oom_adj
&& !capable(CAP_SYS_RESOURCE
)) {
1050 put_task_struct(task
);
1053 task
->mm
->oom_adj
= oom_adjust
;
1055 put_task_struct(task
);
1056 if (end
- buffer
== 0)
1058 return end
- buffer
;
1061 static const struct file_operations proc_oom_adjust_operations
= {
1062 .read
= oom_adjust_read
,
1063 .write
= oom_adjust_write
,
1066 #ifdef CONFIG_AUDITSYSCALL
1067 #define TMPBUFLEN 21
1068 static ssize_t
proc_loginuid_read(struct file
* file
, char __user
* buf
,
1069 size_t count
, loff_t
*ppos
)
1071 struct inode
* inode
= file
->f_path
.dentry
->d_inode
;
1072 struct task_struct
*task
= get_proc_task(inode
);
1074 char tmpbuf
[TMPBUFLEN
];
1078 length
= scnprintf(tmpbuf
, TMPBUFLEN
, "%u",
1079 audit_get_loginuid(task
));
1080 put_task_struct(task
);
1081 return simple_read_from_buffer(buf
, count
, ppos
, tmpbuf
, length
);
1084 static ssize_t
proc_loginuid_write(struct file
* file
, const char __user
* buf
,
1085 size_t count
, loff_t
*ppos
)
1087 struct inode
* inode
= file
->f_path
.dentry
->d_inode
;
1092 if (!capable(CAP_AUDIT_CONTROL
))
1095 if (current
!= pid_task(proc_pid(inode
), PIDTYPE_PID
))
1098 if (count
>= PAGE_SIZE
)
1099 count
= PAGE_SIZE
- 1;
1102 /* No partial writes. */
1105 page
= (char*)__get_free_page(GFP_TEMPORARY
);
1109 if (copy_from_user(page
, buf
, count
))
1113 loginuid
= simple_strtoul(page
, &tmp
, 10);
1119 length
= audit_set_loginuid(current
, loginuid
);
1120 if (likely(length
== 0))
1124 free_page((unsigned long) page
);
1128 static const struct file_operations proc_loginuid_operations
= {
1129 .read
= proc_loginuid_read
,
1130 .write
= proc_loginuid_write
,
1133 static ssize_t
proc_sessionid_read(struct file
* file
, char __user
* buf
,
1134 size_t count
, loff_t
*ppos
)
1136 struct inode
* inode
= file
->f_path
.dentry
->d_inode
;
1137 struct task_struct
*task
= get_proc_task(inode
);
1139 char tmpbuf
[TMPBUFLEN
];
1143 length
= scnprintf(tmpbuf
, TMPBUFLEN
, "%u",
1144 audit_get_sessionid(task
));
1145 put_task_struct(task
);
1146 return simple_read_from_buffer(buf
, count
, ppos
, tmpbuf
, length
);
1149 static const struct file_operations proc_sessionid_operations
= {
1150 .read
= proc_sessionid_read
,
1154 #ifdef CONFIG_FAULT_INJECTION
1155 static ssize_t
proc_fault_inject_read(struct file
* file
, char __user
* buf
,
1156 size_t count
, loff_t
*ppos
)
1158 struct task_struct
*task
= get_proc_task(file
->f_dentry
->d_inode
);
1159 char buffer
[PROC_NUMBUF
];
1165 make_it_fail
= task
->make_it_fail
;
1166 put_task_struct(task
);
1168 len
= snprintf(buffer
, sizeof(buffer
), "%i\n", make_it_fail
);
1170 return simple_read_from_buffer(buf
, count
, ppos
, buffer
, len
);
1173 static ssize_t
proc_fault_inject_write(struct file
* file
,
1174 const char __user
* buf
, size_t count
, loff_t
*ppos
)
1176 struct task_struct
*task
;
1177 char buffer
[PROC_NUMBUF
], *end
;
1180 if (!capable(CAP_SYS_RESOURCE
))
1182 memset(buffer
, 0, sizeof(buffer
));
1183 if (count
> sizeof(buffer
) - 1)
1184 count
= sizeof(buffer
) - 1;
1185 if (copy_from_user(buffer
, buf
, count
))
1187 make_it_fail
= simple_strtol(buffer
, &end
, 0);
1190 task
= get_proc_task(file
->f_dentry
->d_inode
);
1193 task
->make_it_fail
= make_it_fail
;
1194 put_task_struct(task
);
1195 if (end
- buffer
== 0)
1197 return end
- buffer
;
1200 static const struct file_operations proc_fault_inject_operations
= {
1201 .read
= proc_fault_inject_read
,
1202 .write
= proc_fault_inject_write
,
1207 #ifdef CONFIG_SCHED_DEBUG
1209 * Print out various scheduling related per-task fields:
1211 static int sched_show(struct seq_file
*m
, void *v
)
1213 struct inode
*inode
= m
->private;
1214 struct task_struct
*p
;
1216 p
= get_proc_task(inode
);
1219 proc_sched_show_task(p
, m
);
1227 sched_write(struct file
*file
, const char __user
*buf
,
1228 size_t count
, loff_t
*offset
)
1230 struct inode
*inode
= file
->f_path
.dentry
->d_inode
;
1231 struct task_struct
*p
;
1233 p
= get_proc_task(inode
);
1236 proc_sched_set_task(p
);
1243 static int sched_open(struct inode
*inode
, struct file
*filp
)
1247 ret
= single_open(filp
, sched_show
, NULL
);
1249 struct seq_file
*m
= filp
->private_data
;
1256 static const struct file_operations proc_pid_sched_operations
= {
1259 .write
= sched_write
,
1260 .llseek
= seq_lseek
,
1261 .release
= single_release
,
1267 * We added or removed a vma mapping the executable. The vmas are only mapped
1268 * during exec and are not mapped with the mmap system call.
1269 * Callers must hold down_write() on the mm's mmap_sem for these
1271 void added_exe_file_vma(struct mm_struct
*mm
)
1273 mm
->num_exe_file_vmas
++;
1276 void removed_exe_file_vma(struct mm_struct
*mm
)
1278 mm
->num_exe_file_vmas
--;
1279 if ((mm
->num_exe_file_vmas
== 0) && mm
->exe_file
){
1281 mm
->exe_file
= NULL
;
1286 void set_mm_exe_file(struct mm_struct
*mm
, struct file
*new_exe_file
)
1289 get_file(new_exe_file
);
1292 mm
->exe_file
= new_exe_file
;
1293 mm
->num_exe_file_vmas
= 0;
1296 struct file
*get_mm_exe_file(struct mm_struct
*mm
)
1298 struct file
*exe_file
;
1300 /* We need mmap_sem to protect against races with removal of
1301 * VM_EXECUTABLE vmas */
1302 down_read(&mm
->mmap_sem
);
1303 exe_file
= mm
->exe_file
;
1306 up_read(&mm
->mmap_sem
);
1310 void dup_mm_exe_file(struct mm_struct
*oldmm
, struct mm_struct
*newmm
)
1312 /* It's safe to write the exe_file pointer without exe_file_lock because
1313 * this is called during fork when the task is not yet in /proc */
1314 newmm
->exe_file
= get_mm_exe_file(oldmm
);
1317 static int proc_exe_link(struct inode
*inode
, struct path
*exe_path
)
1319 struct task_struct
*task
;
1320 struct mm_struct
*mm
;
1321 struct file
*exe_file
;
1323 task
= get_proc_task(inode
);
1326 mm
= get_task_mm(task
);
1327 put_task_struct(task
);
1330 exe_file
= get_mm_exe_file(mm
);
1333 *exe_path
= exe_file
->f_path
;
1334 path_get(&exe_file
->f_path
);
1341 static void *proc_pid_follow_link(struct dentry
*dentry
, struct nameidata
*nd
)
1343 struct inode
*inode
= dentry
->d_inode
;
1344 int error
= -EACCES
;
1346 /* We don't need a base pointer in the /proc filesystem */
1347 path_put(&nd
->path
);
1349 /* Are we allowed to snoop on the tasks file descriptors? */
1350 if (!proc_fd_access_allowed(inode
))
1353 error
= PROC_I(inode
)->op
.proc_get_link(inode
, &nd
->path
);
1354 nd
->last_type
= LAST_BIND
;
1356 return ERR_PTR(error
);
1359 static int do_proc_readlink(struct path
*path
, char __user
*buffer
, int buflen
)
1361 char *tmp
= (char*)__get_free_page(GFP_TEMPORARY
);
1368 pathname
= d_path(path
, tmp
, PAGE_SIZE
);
1369 len
= PTR_ERR(pathname
);
1370 if (IS_ERR(pathname
))
1372 len
= tmp
+ PAGE_SIZE
- 1 - pathname
;
1376 if (copy_to_user(buffer
, pathname
, len
))
1379 free_page((unsigned long)tmp
);
1383 static int proc_pid_readlink(struct dentry
* dentry
, char __user
* buffer
, int buflen
)
1385 int error
= -EACCES
;
1386 struct inode
*inode
= dentry
->d_inode
;
1389 /* Are we allowed to snoop on the tasks file descriptors? */
1390 if (!proc_fd_access_allowed(inode
))
1393 error
= PROC_I(inode
)->op
.proc_get_link(inode
, &path
);
1397 error
= do_proc_readlink(&path
, buffer
, buflen
);
1403 static const struct inode_operations proc_pid_link_inode_operations
= {
1404 .readlink
= proc_pid_readlink
,
1405 .follow_link
= proc_pid_follow_link
,
1406 .setattr
= proc_setattr
,
1410 /* building an inode */
1412 static int task_dumpable(struct task_struct
*task
)
1415 struct mm_struct
*mm
;
1420 dumpable
= get_dumpable(mm
);
1428 static struct inode
*proc_pid_make_inode(struct super_block
* sb
, struct task_struct
*task
)
1430 struct inode
* inode
;
1431 struct proc_inode
*ei
;
1432 const struct cred
*cred
;
1434 /* We need a new inode */
1436 inode
= new_inode(sb
);
1442 inode
->i_mtime
= inode
->i_atime
= inode
->i_ctime
= CURRENT_TIME
;
1443 inode
->i_op
= &proc_def_inode_operations
;
1446 * grab the reference to task.
1448 ei
->pid
= get_task_pid(task
, PIDTYPE_PID
);
1452 if (task_dumpable(task
)) {
1454 cred
= __task_cred(task
);
1455 inode
->i_uid
= cred
->euid
;
1456 inode
->i_gid
= cred
->egid
;
1459 security_task_to_inode(task
, inode
);
1469 static int pid_getattr(struct vfsmount
*mnt
, struct dentry
*dentry
, struct kstat
*stat
)
1471 struct inode
*inode
= dentry
->d_inode
;
1472 struct task_struct
*task
;
1473 const struct cred
*cred
;
1475 generic_fillattr(inode
, stat
);
1480 task
= pid_task(proc_pid(inode
), PIDTYPE_PID
);
1482 if ((inode
->i_mode
== (S_IFDIR
|S_IRUGO
|S_IXUGO
)) ||
1483 task_dumpable(task
)) {
1484 cred
= __task_cred(task
);
1485 stat
->uid
= cred
->euid
;
1486 stat
->gid
= cred
->egid
;
1496 * Exceptional case: normally we are not allowed to unhash a busy
1497 * directory. In this case, however, we can do it - no aliasing problems
1498 * due to the way we treat inodes.
1500 * Rewrite the inode's ownerships here because the owning task may have
1501 * performed a setuid(), etc.
1503 * Before the /proc/pid/status file was created the only way to read
1504 * the effective uid of a /process was to stat /proc/pid. Reading
1505 * /proc/pid/status is slow enough that procps and other packages
1506 * kept stating /proc/pid. To keep the rules in /proc simple I have
1507 * made this apply to all per process world readable and executable
1510 static int pid_revalidate(struct dentry
*dentry
, struct nameidata
*nd
)
1512 struct inode
*inode
= dentry
->d_inode
;
1513 struct task_struct
*task
= get_proc_task(inode
);
1514 const struct cred
*cred
;
1517 if ((inode
->i_mode
== (S_IFDIR
|S_IRUGO
|S_IXUGO
)) ||
1518 task_dumpable(task
)) {
1520 cred
= __task_cred(task
);
1521 inode
->i_uid
= cred
->euid
;
1522 inode
->i_gid
= cred
->egid
;
1528 inode
->i_mode
&= ~(S_ISUID
| S_ISGID
);
1529 security_task_to_inode(task
, inode
);
1530 put_task_struct(task
);
1537 static int pid_delete_dentry(struct dentry
* dentry
)
1539 /* Is the task we represent dead?
1540 * If so, then don't put the dentry on the lru list,
1541 * kill it immediately.
1543 return !proc_pid(dentry
->d_inode
)->tasks
[PIDTYPE_PID
].first
;
1546 static const struct dentry_operations pid_dentry_operations
=
1548 .d_revalidate
= pid_revalidate
,
1549 .d_delete
= pid_delete_dentry
,
1554 typedef struct dentry
*instantiate_t(struct inode
*, struct dentry
*,
1555 struct task_struct
*, const void *);
1558 * Fill a directory entry.
1560 * If possible create the dcache entry and derive our inode number and
1561 * file type from dcache entry.
1563 * Since all of the proc inode numbers are dynamically generated, the inode
1564 * numbers do not exist until the inode is cache. This means creating the
1565 * the dcache entry in readdir is necessary to keep the inode numbers
1566 * reported by readdir in sync with the inode numbers reported
1569 static int proc_fill_cache(struct file
*filp
, void *dirent
, filldir_t filldir
,
1570 char *name
, int len
,
1571 instantiate_t instantiate
, struct task_struct
*task
, const void *ptr
)
1573 struct dentry
*child
, *dir
= filp
->f_path
.dentry
;
1574 struct inode
*inode
;
1577 unsigned type
= DT_UNKNOWN
;
1581 qname
.hash
= full_name_hash(name
, len
);
1583 child
= d_lookup(dir
, &qname
);
1586 new = d_alloc(dir
, &qname
);
1588 child
= instantiate(dir
->d_inode
, new, task
, ptr
);
1595 if (!child
|| IS_ERR(child
) || !child
->d_inode
)
1596 goto end_instantiate
;
1597 inode
= child
->d_inode
;
1600 type
= inode
->i_mode
>> 12;
1605 ino
= find_inode_number(dir
, &qname
);
1608 return filldir(dirent
, name
, len
, filp
->f_pos
, ino
, type
);
1611 static unsigned name_to_int(struct dentry
*dentry
)
1613 const char *name
= dentry
->d_name
.name
;
1614 int len
= dentry
->d_name
.len
;
1617 if (len
> 1 && *name
== '0')
1620 unsigned c
= *name
++ - '0';
1623 if (n
>= (~0U-9)/10)
1633 #define PROC_FDINFO_MAX 64
1635 static int proc_fd_info(struct inode
*inode
, struct path
*path
, char *info
)
1637 struct task_struct
*task
= get_proc_task(inode
);
1638 struct files_struct
*files
= NULL
;
1640 int fd
= proc_fd(inode
);
1643 files
= get_files_struct(task
);
1644 put_task_struct(task
);
1648 * We are not taking a ref to the file structure, so we must
1651 spin_lock(&files
->file_lock
);
1652 file
= fcheck_files(files
, fd
);
1655 *path
= file
->f_path
;
1656 path_get(&file
->f_path
);
1659 snprintf(info
, PROC_FDINFO_MAX
,
1662 (long long) file
->f_pos
,
1664 spin_unlock(&files
->file_lock
);
1665 put_files_struct(files
);
1668 spin_unlock(&files
->file_lock
);
1669 put_files_struct(files
);
1674 static int proc_fd_link(struct inode
*inode
, struct path
*path
)
1676 return proc_fd_info(inode
, path
, NULL
);
1679 static int tid_fd_revalidate(struct dentry
*dentry
, struct nameidata
*nd
)
1681 struct inode
*inode
= dentry
->d_inode
;
1682 struct task_struct
*task
= get_proc_task(inode
);
1683 int fd
= proc_fd(inode
);
1684 struct files_struct
*files
;
1685 const struct cred
*cred
;
1688 files
= get_files_struct(task
);
1691 if (fcheck_files(files
, fd
)) {
1693 put_files_struct(files
);
1694 if (task_dumpable(task
)) {
1696 cred
= __task_cred(task
);
1697 inode
->i_uid
= cred
->euid
;
1698 inode
->i_gid
= cred
->egid
;
1704 inode
->i_mode
&= ~(S_ISUID
| S_ISGID
);
1705 security_task_to_inode(task
, inode
);
1706 put_task_struct(task
);
1710 put_files_struct(files
);
1712 put_task_struct(task
);
1718 static const struct dentry_operations tid_fd_dentry_operations
=
1720 .d_revalidate
= tid_fd_revalidate
,
1721 .d_delete
= pid_delete_dentry
,
1724 static struct dentry
*proc_fd_instantiate(struct inode
*dir
,
1725 struct dentry
*dentry
, struct task_struct
*task
, const void *ptr
)
1727 unsigned fd
= *(const unsigned *)ptr
;
1729 struct files_struct
*files
;
1730 struct inode
*inode
;
1731 struct proc_inode
*ei
;
1732 struct dentry
*error
= ERR_PTR(-ENOENT
);
1734 inode
= proc_pid_make_inode(dir
->i_sb
, task
);
1739 files
= get_files_struct(task
);
1742 inode
->i_mode
= S_IFLNK
;
1745 * We are not taking a ref to the file structure, so we must
1748 spin_lock(&files
->file_lock
);
1749 file
= fcheck_files(files
, fd
);
1752 if (file
->f_mode
& FMODE_READ
)
1753 inode
->i_mode
|= S_IRUSR
| S_IXUSR
;
1754 if (file
->f_mode
& FMODE_WRITE
)
1755 inode
->i_mode
|= S_IWUSR
| S_IXUSR
;
1756 spin_unlock(&files
->file_lock
);
1757 put_files_struct(files
);
1759 inode
->i_op
= &proc_pid_link_inode_operations
;
1761 ei
->op
.proc_get_link
= proc_fd_link
;
1762 dentry
->d_op
= &tid_fd_dentry_operations
;
1763 d_add(dentry
, inode
);
1764 /* Close the race of the process dying before we return the dentry */
1765 if (tid_fd_revalidate(dentry
, NULL
))
1771 spin_unlock(&files
->file_lock
);
1772 put_files_struct(files
);
1778 static struct dentry
*proc_lookupfd_common(struct inode
*dir
,
1779 struct dentry
*dentry
,
1780 instantiate_t instantiate
)
1782 struct task_struct
*task
= get_proc_task(dir
);
1783 unsigned fd
= name_to_int(dentry
);
1784 struct dentry
*result
= ERR_PTR(-ENOENT
);
1791 result
= instantiate(dir
, dentry
, task
, &fd
);
1793 put_task_struct(task
);
1798 static int proc_readfd_common(struct file
* filp
, void * dirent
,
1799 filldir_t filldir
, instantiate_t instantiate
)
1801 struct dentry
*dentry
= filp
->f_path
.dentry
;
1802 struct inode
*inode
= dentry
->d_inode
;
1803 struct task_struct
*p
= get_proc_task(inode
);
1804 unsigned int fd
, ino
;
1806 struct files_struct
* files
;
1816 if (filldir(dirent
, ".", 1, 0, inode
->i_ino
, DT_DIR
) < 0)
1820 ino
= parent_ino(dentry
);
1821 if (filldir(dirent
, "..", 2, 1, ino
, DT_DIR
) < 0)
1825 files
= get_files_struct(p
);
1829 for (fd
= filp
->f_pos
-2;
1830 fd
< files_fdtable(files
)->max_fds
;
1831 fd
++, filp
->f_pos
++) {
1832 char name
[PROC_NUMBUF
];
1835 if (!fcheck_files(files
, fd
))
1839 len
= snprintf(name
, sizeof(name
), "%d", fd
);
1840 if (proc_fill_cache(filp
, dirent
, filldir
,
1841 name
, len
, instantiate
,
1849 put_files_struct(files
);
1857 static struct dentry
*proc_lookupfd(struct inode
*dir
, struct dentry
*dentry
,
1858 struct nameidata
*nd
)
1860 return proc_lookupfd_common(dir
, dentry
, proc_fd_instantiate
);
1863 static int proc_readfd(struct file
*filp
, void *dirent
, filldir_t filldir
)
1865 return proc_readfd_common(filp
, dirent
, filldir
, proc_fd_instantiate
);
1868 static ssize_t
proc_fdinfo_read(struct file
*file
, char __user
*buf
,
1869 size_t len
, loff_t
*ppos
)
1871 char tmp
[PROC_FDINFO_MAX
];
1872 int err
= proc_fd_info(file
->f_path
.dentry
->d_inode
, NULL
, tmp
);
1874 err
= simple_read_from_buffer(buf
, len
, ppos
, tmp
, strlen(tmp
));
1878 static const struct file_operations proc_fdinfo_file_operations
= {
1879 .open
= nonseekable_open
,
1880 .read
= proc_fdinfo_read
,
1883 static const struct file_operations proc_fd_operations
= {
1884 .read
= generic_read_dir
,
1885 .readdir
= proc_readfd
,
1889 * /proc/pid/fd needs a special permission handler so that a process can still
1890 * access /proc/self/fd after it has executed a setuid().
1892 static int proc_fd_permission(struct inode
*inode
, int mask
)
1896 rv
= generic_permission(inode
, mask
, NULL
);
1899 if (task_pid(current
) == proc_pid(inode
))
1905 * proc directories can do almost nothing..
1907 static const struct inode_operations proc_fd_inode_operations
= {
1908 .lookup
= proc_lookupfd
,
1909 .permission
= proc_fd_permission
,
1910 .setattr
= proc_setattr
,
1913 static struct dentry
*proc_fdinfo_instantiate(struct inode
*dir
,
1914 struct dentry
*dentry
, struct task_struct
*task
, const void *ptr
)
1916 unsigned fd
= *(unsigned *)ptr
;
1917 struct inode
*inode
;
1918 struct proc_inode
*ei
;
1919 struct dentry
*error
= ERR_PTR(-ENOENT
);
1921 inode
= proc_pid_make_inode(dir
->i_sb
, task
);
1926 inode
->i_mode
= S_IFREG
| S_IRUSR
;
1927 inode
->i_fop
= &proc_fdinfo_file_operations
;
1928 dentry
->d_op
= &tid_fd_dentry_operations
;
1929 d_add(dentry
, inode
);
1930 /* Close the race of the process dying before we return the dentry */
1931 if (tid_fd_revalidate(dentry
, NULL
))
1938 static struct dentry
*proc_lookupfdinfo(struct inode
*dir
,
1939 struct dentry
*dentry
,
1940 struct nameidata
*nd
)
1942 return proc_lookupfd_common(dir
, dentry
, proc_fdinfo_instantiate
);
1945 static int proc_readfdinfo(struct file
*filp
, void *dirent
, filldir_t filldir
)
1947 return proc_readfd_common(filp
, dirent
, filldir
,
1948 proc_fdinfo_instantiate
);
1951 static const struct file_operations proc_fdinfo_operations
= {
1952 .read
= generic_read_dir
,
1953 .readdir
= proc_readfdinfo
,
1957 * proc directories can do almost nothing..
1959 static const struct inode_operations proc_fdinfo_inode_operations
= {
1960 .lookup
= proc_lookupfdinfo
,
1961 .setattr
= proc_setattr
,
1965 static struct dentry
*proc_pident_instantiate(struct inode
*dir
,
1966 struct dentry
*dentry
, struct task_struct
*task
, const void *ptr
)
1968 const struct pid_entry
*p
= ptr
;
1969 struct inode
*inode
;
1970 struct proc_inode
*ei
;
1971 struct dentry
*error
= ERR_PTR(-ENOENT
);
1973 inode
= proc_pid_make_inode(dir
->i_sb
, task
);
1978 inode
->i_mode
= p
->mode
;
1979 if (S_ISDIR(inode
->i_mode
))
1980 inode
->i_nlink
= 2; /* Use getattr to fix if necessary */
1982 inode
->i_op
= p
->iop
;
1984 inode
->i_fop
= p
->fop
;
1986 dentry
->d_op
= &pid_dentry_operations
;
1987 d_add(dentry
, inode
);
1988 /* Close the race of the process dying before we return the dentry */
1989 if (pid_revalidate(dentry
, NULL
))
1995 static struct dentry
*proc_pident_lookup(struct inode
*dir
,
1996 struct dentry
*dentry
,
1997 const struct pid_entry
*ents
,
2000 struct dentry
*error
;
2001 struct task_struct
*task
= get_proc_task(dir
);
2002 const struct pid_entry
*p
, *last
;
2004 error
= ERR_PTR(-ENOENT
);
2010 * Yes, it does not scale. And it should not. Don't add
2011 * new entries into /proc/<tgid>/ without very good reasons.
2013 last
= &ents
[nents
- 1];
2014 for (p
= ents
; p
<= last
; p
++) {
2015 if (p
->len
!= dentry
->d_name
.len
)
2017 if (!memcmp(dentry
->d_name
.name
, p
->name
, p
->len
))
2023 error
= proc_pident_instantiate(dir
, dentry
, task
, p
);
2025 put_task_struct(task
);
2030 static int proc_pident_fill_cache(struct file
*filp
, void *dirent
,
2031 filldir_t filldir
, struct task_struct
*task
, const struct pid_entry
*p
)
2033 return proc_fill_cache(filp
, dirent
, filldir
, p
->name
, p
->len
,
2034 proc_pident_instantiate
, task
, p
);
2037 static int proc_pident_readdir(struct file
*filp
,
2038 void *dirent
, filldir_t filldir
,
2039 const struct pid_entry
*ents
, unsigned int nents
)
2042 struct dentry
*dentry
= filp
->f_path
.dentry
;
2043 struct inode
*inode
= dentry
->d_inode
;
2044 struct task_struct
*task
= get_proc_task(inode
);
2045 const struct pid_entry
*p
, *last
;
2058 if (filldir(dirent
, ".", 1, i
, ino
, DT_DIR
) < 0)
2064 ino
= parent_ino(dentry
);
2065 if (filldir(dirent
, "..", 2, i
, ino
, DT_DIR
) < 0)
2077 last
= &ents
[nents
- 1];
2079 if (proc_pident_fill_cache(filp
, dirent
, filldir
, task
, p
) < 0)
2088 put_task_struct(task
);
2093 #ifdef CONFIG_SECURITY
2094 static ssize_t
proc_pid_attr_read(struct file
* file
, char __user
* buf
,
2095 size_t count
, loff_t
*ppos
)
2097 struct inode
* inode
= file
->f_path
.dentry
->d_inode
;
2100 struct task_struct
*task
= get_proc_task(inode
);
2105 length
= security_getprocattr(task
,
2106 (char*)file
->f_path
.dentry
->d_name
.name
,
2108 put_task_struct(task
);
2110 length
= simple_read_from_buffer(buf
, count
, ppos
, p
, length
);
2115 static ssize_t
proc_pid_attr_write(struct file
* file
, const char __user
* buf
,
2116 size_t count
, loff_t
*ppos
)
2118 struct inode
* inode
= file
->f_path
.dentry
->d_inode
;
2121 struct task_struct
*task
= get_proc_task(inode
);
2126 if (count
> PAGE_SIZE
)
2129 /* No partial writes. */
2135 page
= (char*)__get_free_page(GFP_TEMPORARY
);
2140 if (copy_from_user(page
, buf
, count
))
2143 /* Guard against adverse ptrace interaction */
2144 length
= mutex_lock_interruptible(&task
->cred_guard_mutex
);
2148 length
= security_setprocattr(task
,
2149 (char*)file
->f_path
.dentry
->d_name
.name
,
2150 (void*)page
, count
);
2151 mutex_unlock(&task
->cred_guard_mutex
);
2153 free_page((unsigned long) page
);
2155 put_task_struct(task
);
2160 static const struct file_operations proc_pid_attr_operations
= {
2161 .read
= proc_pid_attr_read
,
2162 .write
= proc_pid_attr_write
,
2165 static const struct pid_entry attr_dir_stuff
[] = {
2166 REG("current", S_IRUGO
|S_IWUGO
, proc_pid_attr_operations
),
2167 REG("prev", S_IRUGO
, proc_pid_attr_operations
),
2168 REG("exec", S_IRUGO
|S_IWUGO
, proc_pid_attr_operations
),
2169 REG("fscreate", S_IRUGO
|S_IWUGO
, proc_pid_attr_operations
),
2170 REG("keycreate", S_IRUGO
|S_IWUGO
, proc_pid_attr_operations
),
2171 REG("sockcreate", S_IRUGO
|S_IWUGO
, proc_pid_attr_operations
),
2174 static int proc_attr_dir_readdir(struct file
* filp
,
2175 void * dirent
, filldir_t filldir
)
2177 return proc_pident_readdir(filp
,dirent
,filldir
,
2178 attr_dir_stuff
,ARRAY_SIZE(attr_dir_stuff
));
2181 static const struct file_operations proc_attr_dir_operations
= {
2182 .read
= generic_read_dir
,
2183 .readdir
= proc_attr_dir_readdir
,
2186 static struct dentry
*proc_attr_dir_lookup(struct inode
*dir
,
2187 struct dentry
*dentry
, struct nameidata
*nd
)
2189 return proc_pident_lookup(dir
, dentry
,
2190 attr_dir_stuff
, ARRAY_SIZE(attr_dir_stuff
));
2193 static const struct inode_operations proc_attr_dir_inode_operations
= {
2194 .lookup
= proc_attr_dir_lookup
,
2195 .getattr
= pid_getattr
,
2196 .setattr
= proc_setattr
,
2201 #if defined(USE_ELF_CORE_DUMP) && defined(CONFIG_ELF_CORE)
2202 static ssize_t
proc_coredump_filter_read(struct file
*file
, char __user
*buf
,
2203 size_t count
, loff_t
*ppos
)
2205 struct task_struct
*task
= get_proc_task(file
->f_dentry
->d_inode
);
2206 struct mm_struct
*mm
;
2207 char buffer
[PROC_NUMBUF
];
2215 mm
= get_task_mm(task
);
2217 len
= snprintf(buffer
, sizeof(buffer
), "%08lx\n",
2218 ((mm
->flags
& MMF_DUMP_FILTER_MASK
) >>
2219 MMF_DUMP_FILTER_SHIFT
));
2221 ret
= simple_read_from_buffer(buf
, count
, ppos
, buffer
, len
);
2224 put_task_struct(task
);
2229 static ssize_t
proc_coredump_filter_write(struct file
*file
,
2230 const char __user
*buf
,
2234 struct task_struct
*task
;
2235 struct mm_struct
*mm
;
2236 char buffer
[PROC_NUMBUF
], *end
;
2243 memset(buffer
, 0, sizeof(buffer
));
2244 if (count
> sizeof(buffer
) - 1)
2245 count
= sizeof(buffer
) - 1;
2246 if (copy_from_user(buffer
, buf
, count
))
2250 val
= (unsigned int)simple_strtoul(buffer
, &end
, 0);
2253 if (end
- buffer
== 0)
2257 task
= get_proc_task(file
->f_dentry
->d_inode
);
2262 mm
= get_task_mm(task
);
2266 for (i
= 0, mask
= 1; i
< MMF_DUMP_FILTER_BITS
; i
++, mask
<<= 1) {
2268 set_bit(i
+ MMF_DUMP_FILTER_SHIFT
, &mm
->flags
);
2270 clear_bit(i
+ MMF_DUMP_FILTER_SHIFT
, &mm
->flags
);
2275 put_task_struct(task
);
2280 static const struct file_operations proc_coredump_filter_operations
= {
2281 .read
= proc_coredump_filter_read
,
2282 .write
= proc_coredump_filter_write
,
2289 static int proc_self_readlink(struct dentry
*dentry
, char __user
*buffer
,
2292 struct pid_namespace
*ns
= dentry
->d_sb
->s_fs_info
;
2293 pid_t tgid
= task_tgid_nr_ns(current
, ns
);
2294 char tmp
[PROC_NUMBUF
];
2297 sprintf(tmp
, "%d", tgid
);
2298 return vfs_readlink(dentry
,buffer
,buflen
,tmp
);
2301 static void *proc_self_follow_link(struct dentry
*dentry
, struct nameidata
*nd
)
2303 struct pid_namespace
*ns
= dentry
->d_sb
->s_fs_info
;
2304 pid_t tgid
= task_tgid_nr_ns(current
, ns
);
2305 char tmp
[PROC_NUMBUF
];
2307 return ERR_PTR(-ENOENT
);
2308 sprintf(tmp
, "%d", task_tgid_nr_ns(current
, ns
));
2309 return ERR_PTR(vfs_follow_link(nd
,tmp
));
2312 static const struct inode_operations proc_self_inode_operations
= {
2313 .readlink
= proc_self_readlink
,
2314 .follow_link
= proc_self_follow_link
,
2320 * These are the directory entries in the root directory of /proc
2321 * that properly belong to the /proc filesystem, as they describe
2322 * describe something that is process related.
2324 static const struct pid_entry proc_base_stuff
[] = {
2325 NOD("self", S_IFLNK
|S_IRWXUGO
,
2326 &proc_self_inode_operations
, NULL
, {}),
2330 * Exceptional case: normally we are not allowed to unhash a busy
2331 * directory. In this case, however, we can do it - no aliasing problems
2332 * due to the way we treat inodes.
2334 static int proc_base_revalidate(struct dentry
*dentry
, struct nameidata
*nd
)
2336 struct inode
*inode
= dentry
->d_inode
;
2337 struct task_struct
*task
= get_proc_task(inode
);
2339 put_task_struct(task
);
2346 static const struct dentry_operations proc_base_dentry_operations
=
2348 .d_revalidate
= proc_base_revalidate
,
2349 .d_delete
= pid_delete_dentry
,
2352 static struct dentry
*proc_base_instantiate(struct inode
*dir
,
2353 struct dentry
*dentry
, struct task_struct
*task
, const void *ptr
)
2355 const struct pid_entry
*p
= ptr
;
2356 struct inode
*inode
;
2357 struct proc_inode
*ei
;
2358 struct dentry
*error
= ERR_PTR(-EINVAL
);
2360 /* Allocate the inode */
2361 error
= ERR_PTR(-ENOMEM
);
2362 inode
= new_inode(dir
->i_sb
);
2366 /* Initialize the inode */
2368 inode
->i_mtime
= inode
->i_atime
= inode
->i_ctime
= CURRENT_TIME
;
2371 * grab the reference to the task.
2373 ei
->pid
= get_task_pid(task
, PIDTYPE_PID
);
2377 inode
->i_mode
= p
->mode
;
2378 if (S_ISDIR(inode
->i_mode
))
2380 if (S_ISLNK(inode
->i_mode
))
2383 inode
->i_op
= p
->iop
;
2385 inode
->i_fop
= p
->fop
;
2387 dentry
->d_op
= &proc_base_dentry_operations
;
2388 d_add(dentry
, inode
);
2397 static struct dentry
*proc_base_lookup(struct inode
*dir
, struct dentry
*dentry
)
2399 struct dentry
*error
;
2400 struct task_struct
*task
= get_proc_task(dir
);
2401 const struct pid_entry
*p
, *last
;
2403 error
= ERR_PTR(-ENOENT
);
2408 /* Lookup the directory entry */
2409 last
= &proc_base_stuff
[ARRAY_SIZE(proc_base_stuff
) - 1];
2410 for (p
= proc_base_stuff
; p
<= last
; p
++) {
2411 if (p
->len
!= dentry
->d_name
.len
)
2413 if (!memcmp(dentry
->d_name
.name
, p
->name
, p
->len
))
2419 error
= proc_base_instantiate(dir
, dentry
, task
, p
);
2422 put_task_struct(task
);
2427 static int proc_base_fill_cache(struct file
*filp
, void *dirent
,
2428 filldir_t filldir
, struct task_struct
*task
, const struct pid_entry
*p
)
2430 return proc_fill_cache(filp
, dirent
, filldir
, p
->name
, p
->len
,
2431 proc_base_instantiate
, task
, p
);
2434 #ifdef CONFIG_TASK_IO_ACCOUNTING
2435 static int do_io_accounting(struct task_struct
*task
, char *buffer
, int whole
)
2437 struct task_io_accounting acct
= task
->ioac
;
2438 unsigned long flags
;
2440 if (whole
&& lock_task_sighand(task
, &flags
)) {
2441 struct task_struct
*t
= task
;
2443 task_io_accounting_add(&acct
, &task
->signal
->ioac
);
2444 while_each_thread(task
, t
)
2445 task_io_accounting_add(&acct
, &t
->ioac
);
2447 unlock_task_sighand(task
, &flags
);
2449 return sprintf(buffer
,
2454 "read_bytes: %llu\n"
2455 "write_bytes: %llu\n"
2456 "cancelled_write_bytes: %llu\n",
2457 (unsigned long long)acct
.rchar
,
2458 (unsigned long long)acct
.wchar
,
2459 (unsigned long long)acct
.syscr
,
2460 (unsigned long long)acct
.syscw
,
2461 (unsigned long long)acct
.read_bytes
,
2462 (unsigned long long)acct
.write_bytes
,
2463 (unsigned long long)acct
.cancelled_write_bytes
);
2466 static int proc_tid_io_accounting(struct task_struct
*task
, char *buffer
)
2468 return do_io_accounting(task
, buffer
, 0);
2471 static int proc_tgid_io_accounting(struct task_struct
*task
, char *buffer
)
2473 return do_io_accounting(task
, buffer
, 1);
2475 #endif /* CONFIG_TASK_IO_ACCOUNTING */
2477 static int proc_pid_personality(struct seq_file
*m
, struct pid_namespace
*ns
,
2478 struct pid
*pid
, struct task_struct
*task
)
2480 seq_printf(m
, "%08x\n", task
->personality
);
2487 static const struct file_operations proc_task_operations
;
2488 static const struct inode_operations proc_task_inode_operations
;
2490 static const struct pid_entry tgid_base_stuff
[] = {
2491 DIR("task", S_IRUGO
|S_IXUGO
, proc_task_inode_operations
, proc_task_operations
),
2492 DIR("fd", S_IRUSR
|S_IXUSR
, proc_fd_inode_operations
, proc_fd_operations
),
2493 DIR("fdinfo", S_IRUSR
|S_IXUSR
, proc_fdinfo_inode_operations
, proc_fdinfo_operations
),
2495 DIR("net", S_IRUGO
|S_IXUGO
, proc_net_inode_operations
, proc_net_operations
),
2497 REG("environ", S_IRUSR
, proc_environ_operations
),
2498 INF("auxv", S_IRUSR
, proc_pid_auxv
),
2499 ONE("status", S_IRUGO
, proc_pid_status
),
2500 ONE("personality", S_IRUSR
, proc_pid_personality
),
2501 INF("limits", S_IRUSR
, proc_pid_limits
),
2502 #ifdef CONFIG_SCHED_DEBUG
2503 REG("sched", S_IRUGO
|S_IWUSR
, proc_pid_sched_operations
),
2505 #ifdef CONFIG_HAVE_ARCH_TRACEHOOK
2506 INF("syscall", S_IRUSR
, proc_pid_syscall
),
2508 INF("cmdline", S_IRUGO
, proc_pid_cmdline
),
2509 ONE("stat", S_IRUGO
, proc_tgid_stat
),
2510 ONE("statm", S_IRUGO
, proc_pid_statm
),
2511 REG("maps", S_IRUGO
, proc_maps_operations
),
2513 REG("numa_maps", S_IRUGO
, proc_numa_maps_operations
),
2515 REG("mem", S_IRUSR
|S_IWUSR
, proc_mem_operations
),
2516 LNK("cwd", proc_cwd_link
),
2517 LNK("root", proc_root_link
),
2518 LNK("exe", proc_exe_link
),
2519 REG("mounts", S_IRUGO
, proc_mounts_operations
),
2520 REG("mountinfo", S_IRUGO
, proc_mountinfo_operations
),
2521 REG("mountstats", S_IRUSR
, proc_mountstats_operations
),
2522 #ifdef CONFIG_PROC_PAGE_MONITOR
2523 REG("clear_refs", S_IWUSR
, proc_clear_refs_operations
),
2524 REG("smaps", S_IRUGO
, proc_smaps_operations
),
2525 REG("pagemap", S_IRUSR
, proc_pagemap_operations
),
2527 #ifdef CONFIG_SECURITY
2528 DIR("attr", S_IRUGO
|S_IXUGO
, proc_attr_dir_inode_operations
, proc_attr_dir_operations
),
2530 #ifdef CONFIG_KALLSYMS
2531 INF("wchan", S_IRUGO
, proc_pid_wchan
),
2533 #ifdef CONFIG_STACKTRACE
2534 ONE("stack", S_IRUSR
, proc_pid_stack
),
2536 #ifdef CONFIG_SCHEDSTATS
2537 INF("schedstat", S_IRUGO
, proc_pid_schedstat
),
2539 #ifdef CONFIG_LATENCYTOP
2540 REG("latency", S_IRUGO
, proc_lstats_operations
),
2542 #ifdef CONFIG_PROC_PID_CPUSET
2543 REG("cpuset", S_IRUGO
, proc_cpuset_operations
),
2545 #ifdef CONFIG_CGROUPS
2546 REG("cgroup", S_IRUGO
, proc_cgroup_operations
),
2548 INF("oom_score", S_IRUGO
, proc_oom_score
),
2549 REG("oom_adj", S_IRUGO
|S_IWUSR
, proc_oom_adjust_operations
),
2550 #ifdef CONFIG_AUDITSYSCALL
2551 REG("loginuid", S_IWUSR
|S_IRUGO
, proc_loginuid_operations
),
2552 REG("sessionid", S_IRUGO
, proc_sessionid_operations
),
2554 #ifdef CONFIG_FAULT_INJECTION
2555 REG("make-it-fail", S_IRUGO
|S_IWUSR
, proc_fault_inject_operations
),
2557 #if defined(USE_ELF_CORE_DUMP) && defined(CONFIG_ELF_CORE)
2558 REG("coredump_filter", S_IRUGO
|S_IWUSR
, proc_coredump_filter_operations
),
2560 #ifdef CONFIG_TASK_IO_ACCOUNTING
2561 INF("io", S_IRUGO
, proc_tgid_io_accounting
),
2565 static int proc_tgid_base_readdir(struct file
* filp
,
2566 void * dirent
, filldir_t filldir
)
2568 return proc_pident_readdir(filp
,dirent
,filldir
,
2569 tgid_base_stuff
,ARRAY_SIZE(tgid_base_stuff
));
2572 static const struct file_operations proc_tgid_base_operations
= {
2573 .read
= generic_read_dir
,
2574 .readdir
= proc_tgid_base_readdir
,
2577 static struct dentry
*proc_tgid_base_lookup(struct inode
*dir
, struct dentry
*dentry
, struct nameidata
*nd
){
2578 return proc_pident_lookup(dir
, dentry
,
2579 tgid_base_stuff
, ARRAY_SIZE(tgid_base_stuff
));
2582 static const struct inode_operations proc_tgid_base_inode_operations
= {
2583 .lookup
= proc_tgid_base_lookup
,
2584 .getattr
= pid_getattr
,
2585 .setattr
= proc_setattr
,
2588 static void proc_flush_task_mnt(struct vfsmount
*mnt
, pid_t pid
, pid_t tgid
)
2590 struct dentry
*dentry
, *leader
, *dir
;
2591 char buf
[PROC_NUMBUF
];
2595 name
.len
= snprintf(buf
, sizeof(buf
), "%d", pid
);
2596 dentry
= d_hash_and_lookup(mnt
->mnt_root
, &name
);
2598 if (!(current
->flags
& PF_EXITING
))
2599 shrink_dcache_parent(dentry
);
2608 name
.len
= snprintf(buf
, sizeof(buf
), "%d", tgid
);
2609 leader
= d_hash_and_lookup(mnt
->mnt_root
, &name
);
2614 name
.len
= strlen(name
.name
);
2615 dir
= d_hash_and_lookup(leader
, &name
);
2617 goto out_put_leader
;
2620 name
.len
= snprintf(buf
, sizeof(buf
), "%d", pid
);
2621 dentry
= d_hash_and_lookup(dir
, &name
);
2623 shrink_dcache_parent(dentry
);
2636 * proc_flush_task - Remove dcache entries for @task from the /proc dcache.
2637 * @task: task that should be flushed.
2639 * When flushing dentries from proc, one needs to flush them from global
2640 * proc (proc_mnt) and from all the namespaces' procs this task was seen
2641 * in. This call is supposed to do all of this job.
2643 * Looks in the dcache for
2645 * /proc/@tgid/task/@pid
2646 * if either directory is present flushes it and all of it'ts children
2649 * It is safe and reasonable to cache /proc entries for a task until
2650 * that task exits. After that they just clog up the dcache with
2651 * useless entries, possibly causing useful dcache entries to be
2652 * flushed instead. This routine is proved to flush those useless
2653 * dcache entries at process exit time.
2655 * NOTE: This routine is just an optimization so it does not guarantee
2656 * that no dcache entries will exist at process exit time it
2657 * just makes it very unlikely that any will persist.
2660 void proc_flush_task(struct task_struct
*task
)
2663 struct pid
*pid
, *tgid
= NULL
;
2666 pid
= task_pid(task
);
2667 if (thread_group_leader(task
))
2668 tgid
= task_tgid(task
);
2670 for (i
= 0; i
<= pid
->level
; i
++) {
2671 upid
= &pid
->numbers
[i
];
2672 proc_flush_task_mnt(upid
->ns
->proc_mnt
, upid
->nr
,
2673 tgid
? tgid
->numbers
[i
].nr
: 0);
2676 upid
= &pid
->numbers
[pid
->level
];
2678 pid_ns_release_proc(upid
->ns
);
2681 static struct dentry
*proc_pid_instantiate(struct inode
*dir
,
2682 struct dentry
* dentry
,
2683 struct task_struct
*task
, const void *ptr
)
2685 struct dentry
*error
= ERR_PTR(-ENOENT
);
2686 struct inode
*inode
;
2688 inode
= proc_pid_make_inode(dir
->i_sb
, task
);
2692 inode
->i_mode
= S_IFDIR
|S_IRUGO
|S_IXUGO
;
2693 inode
->i_op
= &proc_tgid_base_inode_operations
;
2694 inode
->i_fop
= &proc_tgid_base_operations
;
2695 inode
->i_flags
|=S_IMMUTABLE
;
2697 inode
->i_nlink
= 2 + pid_entry_count_dirs(tgid_base_stuff
,
2698 ARRAY_SIZE(tgid_base_stuff
));
2700 dentry
->d_op
= &pid_dentry_operations
;
2702 d_add(dentry
, inode
);
2703 /* Close the race of the process dying before we return the dentry */
2704 if (pid_revalidate(dentry
, NULL
))
2710 struct dentry
*proc_pid_lookup(struct inode
*dir
, struct dentry
* dentry
, struct nameidata
*nd
)
2712 struct dentry
*result
= ERR_PTR(-ENOENT
);
2713 struct task_struct
*task
;
2715 struct pid_namespace
*ns
;
2717 result
= proc_base_lookup(dir
, dentry
);
2718 if (!IS_ERR(result
) || PTR_ERR(result
) != -ENOENT
)
2721 tgid
= name_to_int(dentry
);
2725 ns
= dentry
->d_sb
->s_fs_info
;
2727 task
= find_task_by_pid_ns(tgid
, ns
);
2729 get_task_struct(task
);
2734 result
= proc_pid_instantiate(dir
, dentry
, task
, NULL
);
2735 put_task_struct(task
);
2741 * Find the first task with tgid >= tgid
2746 struct task_struct
*task
;
2748 static struct tgid_iter
next_tgid(struct pid_namespace
*ns
, struct tgid_iter iter
)
2753 put_task_struct(iter
.task
);
2757 pid
= find_ge_pid(iter
.tgid
, ns
);
2759 iter
.tgid
= pid_nr_ns(pid
, ns
);
2760 iter
.task
= pid_task(pid
, PIDTYPE_PID
);
2761 /* What we to know is if the pid we have find is the
2762 * pid of a thread_group_leader. Testing for task
2763 * being a thread_group_leader is the obvious thing
2764 * todo but there is a window when it fails, due to
2765 * the pid transfer logic in de_thread.
2767 * So we perform the straight forward test of seeing
2768 * if the pid we have found is the pid of a thread
2769 * group leader, and don't worry if the task we have
2770 * found doesn't happen to be a thread group leader.
2771 * As we don't care in the case of readdir.
2773 if (!iter
.task
|| !has_group_leader_pid(iter
.task
)) {
2777 get_task_struct(iter
.task
);
2783 #define TGID_OFFSET (FIRST_PROCESS_ENTRY + ARRAY_SIZE(proc_base_stuff))
2785 static int proc_pid_fill_cache(struct file
*filp
, void *dirent
, filldir_t filldir
,
2786 struct tgid_iter iter
)
2788 char name
[PROC_NUMBUF
];
2789 int len
= snprintf(name
, sizeof(name
), "%d", iter
.tgid
);
2790 return proc_fill_cache(filp
, dirent
, filldir
, name
, len
,
2791 proc_pid_instantiate
, iter
.task
, NULL
);
2794 /* for the /proc/ directory itself, after non-process stuff has been done */
2795 int proc_pid_readdir(struct file
* filp
, void * dirent
, filldir_t filldir
)
2797 unsigned int nr
= filp
->f_pos
- FIRST_PROCESS_ENTRY
;
2798 struct task_struct
*reaper
= get_proc_task(filp
->f_path
.dentry
->d_inode
);
2799 struct tgid_iter iter
;
2800 struct pid_namespace
*ns
;
2805 for (; nr
< ARRAY_SIZE(proc_base_stuff
); filp
->f_pos
++, nr
++) {
2806 const struct pid_entry
*p
= &proc_base_stuff
[nr
];
2807 if (proc_base_fill_cache(filp
, dirent
, filldir
, reaper
, p
) < 0)
2811 ns
= filp
->f_dentry
->d_sb
->s_fs_info
;
2813 iter
.tgid
= filp
->f_pos
- TGID_OFFSET
;
2814 for (iter
= next_tgid(ns
, iter
);
2816 iter
.tgid
+= 1, iter
= next_tgid(ns
, iter
)) {
2817 filp
->f_pos
= iter
.tgid
+ TGID_OFFSET
;
2818 if (proc_pid_fill_cache(filp
, dirent
, filldir
, iter
) < 0) {
2819 put_task_struct(iter
.task
);
2823 filp
->f_pos
= PID_MAX_LIMIT
+ TGID_OFFSET
;
2825 put_task_struct(reaper
);
2833 static const struct pid_entry tid_base_stuff
[] = {
2834 DIR("fd", S_IRUSR
|S_IXUSR
, proc_fd_inode_operations
, proc_fd_operations
),
2835 DIR("fdinfo", S_IRUSR
|S_IXUSR
, proc_fdinfo_inode_operations
, proc_fd_operations
),
2836 REG("environ", S_IRUSR
, proc_environ_operations
),
2837 INF("auxv", S_IRUSR
, proc_pid_auxv
),
2838 ONE("status", S_IRUGO
, proc_pid_status
),
2839 ONE("personality", S_IRUSR
, proc_pid_personality
),
2840 INF("limits", S_IRUSR
, proc_pid_limits
),
2841 #ifdef CONFIG_SCHED_DEBUG
2842 REG("sched", S_IRUGO
|S_IWUSR
, proc_pid_sched_operations
),
2844 #ifdef CONFIG_HAVE_ARCH_TRACEHOOK
2845 INF("syscall", S_IRUSR
, proc_pid_syscall
),
2847 INF("cmdline", S_IRUGO
, proc_pid_cmdline
),
2848 ONE("stat", S_IRUGO
, proc_tid_stat
),
2849 ONE("statm", S_IRUGO
, proc_pid_statm
),
2850 REG("maps", S_IRUGO
, proc_maps_operations
),
2852 REG("numa_maps", S_IRUGO
, proc_numa_maps_operations
),
2854 REG("mem", S_IRUSR
|S_IWUSR
, proc_mem_operations
),
2855 LNK("cwd", proc_cwd_link
),
2856 LNK("root", proc_root_link
),
2857 LNK("exe", proc_exe_link
),
2858 REG("mounts", S_IRUGO
, proc_mounts_operations
),
2859 REG("mountinfo", S_IRUGO
, proc_mountinfo_operations
),
2860 #ifdef CONFIG_PROC_PAGE_MONITOR
2861 REG("clear_refs", S_IWUSR
, proc_clear_refs_operations
),
2862 REG("smaps", S_IRUGO
, proc_smaps_operations
),
2863 REG("pagemap", S_IRUSR
, proc_pagemap_operations
),
2865 #ifdef CONFIG_SECURITY
2866 DIR("attr", S_IRUGO
|S_IXUGO
, proc_attr_dir_inode_operations
, proc_attr_dir_operations
),
2868 #ifdef CONFIG_KALLSYMS
2869 INF("wchan", S_IRUGO
, proc_pid_wchan
),
2871 #ifdef CONFIG_STACKTRACE
2872 ONE("stack", S_IRUSR
, proc_pid_stack
),
2874 #ifdef CONFIG_SCHEDSTATS
2875 INF("schedstat", S_IRUGO
, proc_pid_schedstat
),
2877 #ifdef CONFIG_LATENCYTOP
2878 REG("latency", S_IRUGO
, proc_lstats_operations
),
2880 #ifdef CONFIG_PROC_PID_CPUSET
2881 REG("cpuset", S_IRUGO
, proc_cpuset_operations
),
2883 #ifdef CONFIG_CGROUPS
2884 REG("cgroup", S_IRUGO
, proc_cgroup_operations
),
2886 INF("oom_score", S_IRUGO
, proc_oom_score
),
2887 REG("oom_adj", S_IRUGO
|S_IWUSR
, proc_oom_adjust_operations
),
2888 #ifdef CONFIG_AUDITSYSCALL
2889 REG("loginuid", S_IWUSR
|S_IRUGO
, proc_loginuid_operations
),
2890 REG("sessionid", S_IRUSR
, proc_sessionid_operations
),
2892 #ifdef CONFIG_FAULT_INJECTION
2893 REG("make-it-fail", S_IRUGO
|S_IWUSR
, proc_fault_inject_operations
),
2895 #ifdef CONFIG_TASK_IO_ACCOUNTING
2896 INF("io", S_IRUGO
, proc_tid_io_accounting
),
2900 static int proc_tid_base_readdir(struct file
* filp
,
2901 void * dirent
, filldir_t filldir
)
2903 return proc_pident_readdir(filp
,dirent
,filldir
,
2904 tid_base_stuff
,ARRAY_SIZE(tid_base_stuff
));
2907 static struct dentry
*proc_tid_base_lookup(struct inode
*dir
, struct dentry
*dentry
, struct nameidata
*nd
){
2908 return proc_pident_lookup(dir
, dentry
,
2909 tid_base_stuff
, ARRAY_SIZE(tid_base_stuff
));
2912 static const struct file_operations proc_tid_base_operations
= {
2913 .read
= generic_read_dir
,
2914 .readdir
= proc_tid_base_readdir
,
2917 static const struct inode_operations proc_tid_base_inode_operations
= {
2918 .lookup
= proc_tid_base_lookup
,
2919 .getattr
= pid_getattr
,
2920 .setattr
= proc_setattr
,
2923 static struct dentry
*proc_task_instantiate(struct inode
*dir
,
2924 struct dentry
*dentry
, struct task_struct
*task
, const void *ptr
)
2926 struct dentry
*error
= ERR_PTR(-ENOENT
);
2927 struct inode
*inode
;
2928 inode
= proc_pid_make_inode(dir
->i_sb
, task
);
2932 inode
->i_mode
= S_IFDIR
|S_IRUGO
|S_IXUGO
;
2933 inode
->i_op
= &proc_tid_base_inode_operations
;
2934 inode
->i_fop
= &proc_tid_base_operations
;
2935 inode
->i_flags
|=S_IMMUTABLE
;
2937 inode
->i_nlink
= 2 + pid_entry_count_dirs(tid_base_stuff
,
2938 ARRAY_SIZE(tid_base_stuff
));
2940 dentry
->d_op
= &pid_dentry_operations
;
2942 d_add(dentry
, inode
);
2943 /* Close the race of the process dying before we return the dentry */
2944 if (pid_revalidate(dentry
, NULL
))
2950 static struct dentry
*proc_task_lookup(struct inode
*dir
, struct dentry
* dentry
, struct nameidata
*nd
)
2952 struct dentry
*result
= ERR_PTR(-ENOENT
);
2953 struct task_struct
*task
;
2954 struct task_struct
*leader
= get_proc_task(dir
);
2956 struct pid_namespace
*ns
;
2961 tid
= name_to_int(dentry
);
2965 ns
= dentry
->d_sb
->s_fs_info
;
2967 task
= find_task_by_pid_ns(tid
, ns
);
2969 get_task_struct(task
);
2973 if (!same_thread_group(leader
, task
))
2976 result
= proc_task_instantiate(dir
, dentry
, task
, NULL
);
2978 put_task_struct(task
);
2980 put_task_struct(leader
);
2986 * Find the first tid of a thread group to return to user space.
2988 * Usually this is just the thread group leader, but if the users
2989 * buffer was too small or there was a seek into the middle of the
2990 * directory we have more work todo.
2992 * In the case of a short read we start with find_task_by_pid.
2994 * In the case of a seek we start with the leader and walk nr
2997 static struct task_struct
*first_tid(struct task_struct
*leader
,
2998 int tid
, int nr
, struct pid_namespace
*ns
)
3000 struct task_struct
*pos
;
3003 /* Attempt to start with the pid of a thread */
3004 if (tid
&& (nr
> 0)) {
3005 pos
= find_task_by_pid_ns(tid
, ns
);
3006 if (pos
&& (pos
->group_leader
== leader
))
3010 /* If nr exceeds the number of threads there is nothing todo */
3012 if (nr
&& nr
>= get_nr_threads(leader
))
3015 /* If we haven't found our starting place yet start
3016 * with the leader and walk nr threads forward.
3018 for (pos
= leader
; nr
> 0; --nr
) {
3019 pos
= next_thread(pos
);
3020 if (pos
== leader
) {
3026 get_task_struct(pos
);
3033 * Find the next thread in the thread list.
3034 * Return NULL if there is an error or no next thread.
3036 * The reference to the input task_struct is released.
3038 static struct task_struct
*next_tid(struct task_struct
*start
)
3040 struct task_struct
*pos
= NULL
;
3042 if (pid_alive(start
)) {
3043 pos
= next_thread(start
);
3044 if (thread_group_leader(pos
))
3047 get_task_struct(pos
);
3050 put_task_struct(start
);
3054 static int proc_task_fill_cache(struct file
*filp
, void *dirent
, filldir_t filldir
,
3055 struct task_struct
*task
, int tid
)
3057 char name
[PROC_NUMBUF
];
3058 int len
= snprintf(name
, sizeof(name
), "%d", tid
);
3059 return proc_fill_cache(filp
, dirent
, filldir
, name
, len
,
3060 proc_task_instantiate
, task
, NULL
);
3063 /* for the /proc/TGID/task/ directories */
3064 static int proc_task_readdir(struct file
* filp
, void * dirent
, filldir_t filldir
)
3066 struct dentry
*dentry
= filp
->f_path
.dentry
;
3067 struct inode
*inode
= dentry
->d_inode
;
3068 struct task_struct
*leader
= NULL
;
3069 struct task_struct
*task
;
3070 int retval
= -ENOENT
;
3073 struct pid_namespace
*ns
;
3075 task
= get_proc_task(inode
);
3079 if (pid_alive(task
)) {
3080 leader
= task
->group_leader
;
3081 get_task_struct(leader
);
3084 put_task_struct(task
);
3089 switch ((unsigned long)filp
->f_pos
) {
3092 if (filldir(dirent
, ".", 1, filp
->f_pos
, ino
, DT_DIR
) < 0)
3097 ino
= parent_ino(dentry
);
3098 if (filldir(dirent
, "..", 2, filp
->f_pos
, ino
, DT_DIR
) < 0)
3104 /* f_version caches the tgid value that the last readdir call couldn't
3105 * return. lseek aka telldir automagically resets f_version to 0.
3107 ns
= filp
->f_dentry
->d_sb
->s_fs_info
;
3108 tid
= (int)filp
->f_version
;
3109 filp
->f_version
= 0;
3110 for (task
= first_tid(leader
, tid
, filp
->f_pos
- 2, ns
);
3112 task
= next_tid(task
), filp
->f_pos
++) {
3113 tid
= task_pid_nr_ns(task
, ns
);
3114 if (proc_task_fill_cache(filp
, dirent
, filldir
, task
, tid
) < 0) {
3115 /* returning this tgid failed, save it as the first
3116 * pid for the next readir call */
3117 filp
->f_version
= (u64
)tid
;
3118 put_task_struct(task
);
3123 put_task_struct(leader
);
3128 static int proc_task_getattr(struct vfsmount
*mnt
, struct dentry
*dentry
, struct kstat
*stat
)
3130 struct inode
*inode
= dentry
->d_inode
;
3131 struct task_struct
*p
= get_proc_task(inode
);
3132 generic_fillattr(inode
, stat
);
3135 stat
->nlink
+= get_nr_threads(p
);
3142 static const struct inode_operations proc_task_inode_operations
= {
3143 .lookup
= proc_task_lookup
,
3144 .getattr
= proc_task_getattr
,
3145 .setattr
= proc_setattr
,
3148 static const struct file_operations proc_task_operations
= {
3149 .read
= generic_read_dir
,
3150 .readdir
= proc_task_readdir
,