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/user_namespace.h>
85 #include <linux/fs_struct.h>
86 #include <linux/slab.h>
87 #include <linux/flex_array.h>
88 #ifdef CONFIG_HARDWALL
89 #include <asm/hardwall.h>
91 #include <trace/events/oom.h>
95 * Implementing inode permission operations in /proc is almost
96 * certainly an error. Permission checks need to happen during
97 * each system call not at open time. The reason is that most of
98 * what we wish to check for permissions in /proc varies at runtime.
100 * The classic example of a problem is opening file descriptors
101 * in /proc for a task before it execs a suid executable.
108 const struct inode_operations
*iop
;
109 const struct file_operations
*fop
;
113 #define NOD(NAME, MODE, IOP, FOP, OP) { \
115 .len = sizeof(NAME) - 1, \
122 #define DIR(NAME, MODE, iops, fops) \
123 NOD(NAME, (S_IFDIR|(MODE)), &iops, &fops, {} )
124 #define LNK(NAME, get_link) \
125 NOD(NAME, (S_IFLNK|S_IRWXUGO), \
126 &proc_pid_link_inode_operations, NULL, \
127 { .proc_get_link = get_link } )
128 #define REG(NAME, MODE, fops) \
129 NOD(NAME, (S_IFREG|(MODE)), NULL, &fops, {})
130 #define INF(NAME, MODE, read) \
131 NOD(NAME, (S_IFREG|(MODE)), \
132 NULL, &proc_info_file_operations, \
133 { .proc_read = read } )
134 #define ONE(NAME, MODE, show) \
135 NOD(NAME, (S_IFREG|(MODE)), \
136 NULL, &proc_single_file_operations, \
137 { .proc_show = show } )
139 static int proc_fd_permission(struct inode
*inode
, int mask
);
142 * Count the number of hardlinks for the pid_entry table, excluding the .
145 static unsigned int pid_entry_count_dirs(const struct pid_entry
*entries
,
152 for (i
= 0; i
< n
; ++i
) {
153 if (S_ISDIR(entries
[i
].mode
))
160 static int get_task_root(struct task_struct
*task
, struct path
*root
)
162 int result
= -ENOENT
;
166 get_fs_root(task
->fs
, root
);
173 static int proc_cwd_link(struct dentry
*dentry
, struct path
*path
)
175 struct task_struct
*task
= get_proc_task(dentry
->d_inode
);
176 int result
= -ENOENT
;
181 get_fs_pwd(task
->fs
, path
);
185 put_task_struct(task
);
190 static int proc_root_link(struct dentry
*dentry
, struct path
*path
)
192 struct task_struct
*task
= get_proc_task(dentry
->d_inode
);
193 int result
= -ENOENT
;
196 result
= get_task_root(task
, path
);
197 put_task_struct(task
);
202 static int proc_pid_cmdline(struct task_struct
*task
, char * buffer
)
206 struct mm_struct
*mm
= get_task_mm(task
);
210 goto out_mm
; /* Shh! No looking before we're done */
212 len
= mm
->arg_end
- mm
->arg_start
;
217 res
= access_process_vm(task
, mm
->arg_start
, buffer
, len
, 0);
219 // If the nul at the end of args has been overwritten, then
220 // assume application is using setproctitle(3).
221 if (res
> 0 && buffer
[res
-1] != '\0' && len
< PAGE_SIZE
) {
222 len
= strnlen(buffer
, res
);
226 len
= mm
->env_end
- mm
->env_start
;
227 if (len
> PAGE_SIZE
- res
)
228 len
= PAGE_SIZE
- res
;
229 res
+= access_process_vm(task
, mm
->env_start
, buffer
+res
, len
, 0);
230 res
= strnlen(buffer
, res
);
239 static int proc_pid_auxv(struct task_struct
*task
, char *buffer
)
241 struct mm_struct
*mm
= mm_access(task
, PTRACE_MODE_READ
);
242 int res
= PTR_ERR(mm
);
243 if (mm
&& !IS_ERR(mm
)) {
244 unsigned int nwords
= 0;
247 } while (mm
->saved_auxv
[nwords
- 2] != 0); /* AT_NULL */
248 res
= nwords
* sizeof(mm
->saved_auxv
[0]);
251 memcpy(buffer
, mm
->saved_auxv
, res
);
258 #ifdef CONFIG_KALLSYMS
260 * Provides a wchan file via kallsyms in a proper one-value-per-file format.
261 * Returns the resolved symbol. If that fails, simply return the address.
263 static int proc_pid_wchan(struct task_struct
*task
, char *buffer
)
266 char symname
[KSYM_NAME_LEN
];
268 wchan
= get_wchan(task
);
270 if (lookup_symbol_name(wchan
, symname
) < 0)
271 if (!ptrace_may_access(task
, PTRACE_MODE_READ
))
274 return sprintf(buffer
, "%lu", wchan
);
276 return sprintf(buffer
, "%s", symname
);
278 #endif /* CONFIG_KALLSYMS */
280 static int lock_trace(struct task_struct
*task
)
282 int err
= mutex_lock_killable(&task
->signal
->cred_guard_mutex
);
285 if (!ptrace_may_access(task
, PTRACE_MODE_ATTACH
)) {
286 mutex_unlock(&task
->signal
->cred_guard_mutex
);
292 static void unlock_trace(struct task_struct
*task
)
294 mutex_unlock(&task
->signal
->cred_guard_mutex
);
297 #ifdef CONFIG_STACKTRACE
299 #define MAX_STACK_TRACE_DEPTH 64
301 static int proc_pid_stack(struct seq_file
*m
, struct pid_namespace
*ns
,
302 struct pid
*pid
, struct task_struct
*task
)
304 struct stack_trace trace
;
305 unsigned long *entries
;
309 entries
= kmalloc(MAX_STACK_TRACE_DEPTH
* sizeof(*entries
), GFP_KERNEL
);
313 trace
.nr_entries
= 0;
314 trace
.max_entries
= MAX_STACK_TRACE_DEPTH
;
315 trace
.entries
= entries
;
318 err
= lock_trace(task
);
320 save_stack_trace_tsk(task
, &trace
);
322 for (i
= 0; i
< trace
.nr_entries
; i
++) {
323 seq_printf(m
, "[<%pK>] %pS\n",
324 (void *)entries
[i
], (void *)entries
[i
]);
334 #ifdef CONFIG_SCHEDSTATS
336 * Provides /proc/PID/schedstat
338 static int proc_pid_schedstat(struct task_struct
*task
, char *buffer
)
340 return sprintf(buffer
, "%llu %llu %lu\n",
341 (unsigned long long)task
->se
.sum_exec_runtime
,
342 (unsigned long long)task
->sched_info
.run_delay
,
343 task
->sched_info
.pcount
);
347 #ifdef CONFIG_LATENCYTOP
348 static int lstats_show_proc(struct seq_file
*m
, void *v
)
351 struct inode
*inode
= m
->private;
352 struct task_struct
*task
= get_proc_task(inode
);
356 seq_puts(m
, "Latency Top version : v0.1\n");
357 for (i
= 0; i
< 32; i
++) {
358 struct latency_record
*lr
= &task
->latency_record
[i
];
359 if (lr
->backtrace
[0]) {
361 seq_printf(m
, "%i %li %li",
362 lr
->count
, lr
->time
, lr
->max
);
363 for (q
= 0; q
< LT_BACKTRACEDEPTH
; q
++) {
364 unsigned long bt
= lr
->backtrace
[q
];
369 seq_printf(m
, " %ps", (void *)bt
);
375 put_task_struct(task
);
379 static int lstats_open(struct inode
*inode
, struct file
*file
)
381 return single_open(file
, lstats_show_proc
, inode
);
384 static ssize_t
lstats_write(struct file
*file
, const char __user
*buf
,
385 size_t count
, loff_t
*offs
)
387 struct task_struct
*task
= get_proc_task(file
->f_dentry
->d_inode
);
391 clear_all_latency_tracing(task
);
392 put_task_struct(task
);
397 static const struct file_operations proc_lstats_operations
= {
400 .write
= lstats_write
,
402 .release
= single_release
,
407 static int proc_oom_score(struct task_struct
*task
, char *buffer
)
409 unsigned long totalpages
= totalram_pages
+ total_swap_pages
;
410 unsigned long points
= 0;
412 read_lock(&tasklist_lock
);
414 points
= oom_badness(task
, NULL
, NULL
, totalpages
) *
416 read_unlock(&tasklist_lock
);
417 return sprintf(buffer
, "%lu\n", points
);
425 static const struct limit_names lnames
[RLIM_NLIMITS
] = {
426 [RLIMIT_CPU
] = {"Max cpu time", "seconds"},
427 [RLIMIT_FSIZE
] = {"Max file size", "bytes"},
428 [RLIMIT_DATA
] = {"Max data size", "bytes"},
429 [RLIMIT_STACK
] = {"Max stack size", "bytes"},
430 [RLIMIT_CORE
] = {"Max core file size", "bytes"},
431 [RLIMIT_RSS
] = {"Max resident set", "bytes"},
432 [RLIMIT_NPROC
] = {"Max processes", "processes"},
433 [RLIMIT_NOFILE
] = {"Max open files", "files"},
434 [RLIMIT_MEMLOCK
] = {"Max locked memory", "bytes"},
435 [RLIMIT_AS
] = {"Max address space", "bytes"},
436 [RLIMIT_LOCKS
] = {"Max file locks", "locks"},
437 [RLIMIT_SIGPENDING
] = {"Max pending signals", "signals"},
438 [RLIMIT_MSGQUEUE
] = {"Max msgqueue size", "bytes"},
439 [RLIMIT_NICE
] = {"Max nice priority", NULL
},
440 [RLIMIT_RTPRIO
] = {"Max realtime priority", NULL
},
441 [RLIMIT_RTTIME
] = {"Max realtime timeout", "us"},
444 /* Display limits for a process */
445 static int proc_pid_limits(struct task_struct
*task
, char *buffer
)
450 char *bufptr
= buffer
;
452 struct rlimit rlim
[RLIM_NLIMITS
];
454 if (!lock_task_sighand(task
, &flags
))
456 memcpy(rlim
, task
->signal
->rlim
, sizeof(struct rlimit
) * RLIM_NLIMITS
);
457 unlock_task_sighand(task
, &flags
);
460 * print the file header
462 count
+= sprintf(&bufptr
[count
], "%-25s %-20s %-20s %-10s\n",
463 "Limit", "Soft Limit", "Hard Limit", "Units");
465 for (i
= 0; i
< RLIM_NLIMITS
; i
++) {
466 if (rlim
[i
].rlim_cur
== RLIM_INFINITY
)
467 count
+= sprintf(&bufptr
[count
], "%-25s %-20s ",
468 lnames
[i
].name
, "unlimited");
470 count
+= sprintf(&bufptr
[count
], "%-25s %-20lu ",
471 lnames
[i
].name
, rlim
[i
].rlim_cur
);
473 if (rlim
[i
].rlim_max
== RLIM_INFINITY
)
474 count
+= sprintf(&bufptr
[count
], "%-20s ", "unlimited");
476 count
+= sprintf(&bufptr
[count
], "%-20lu ",
480 count
+= sprintf(&bufptr
[count
], "%-10s\n",
483 count
+= sprintf(&bufptr
[count
], "\n");
489 #ifdef CONFIG_HAVE_ARCH_TRACEHOOK
490 static int proc_pid_syscall(struct task_struct
*task
, char *buffer
)
493 unsigned long args
[6], sp
, pc
;
494 int res
= lock_trace(task
);
498 if (task_current_syscall(task
, &nr
, args
, 6, &sp
, &pc
))
499 res
= sprintf(buffer
, "running\n");
501 res
= sprintf(buffer
, "%ld 0x%lx 0x%lx\n", nr
, sp
, pc
);
503 res
= sprintf(buffer
,
504 "%ld 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx\n",
506 args
[0], args
[1], args
[2], args
[3], args
[4], args
[5],
511 #endif /* CONFIG_HAVE_ARCH_TRACEHOOK */
513 /************************************************************************/
514 /* Here the fs part begins */
515 /************************************************************************/
517 /* permission checks */
518 static int proc_fd_access_allowed(struct inode
*inode
)
520 struct task_struct
*task
;
522 /* Allow access to a task's file descriptors if it is us or we
523 * may use ptrace attach to the process and find out that
526 task
= get_proc_task(inode
);
528 allowed
= ptrace_may_access(task
, PTRACE_MODE_READ
);
529 put_task_struct(task
);
534 int proc_setattr(struct dentry
*dentry
, struct iattr
*attr
)
537 struct inode
*inode
= dentry
->d_inode
;
539 if (attr
->ia_valid
& ATTR_MODE
)
542 error
= inode_change_ok(inode
, attr
);
546 if ((attr
->ia_valid
& ATTR_SIZE
) &&
547 attr
->ia_size
!= i_size_read(inode
)) {
548 error
= vmtruncate(inode
, attr
->ia_size
);
553 setattr_copy(inode
, attr
);
554 mark_inode_dirty(inode
);
559 * May current process learn task's sched/cmdline info (for hide_pid_min=1)
560 * or euid/egid (for hide_pid_min=2)?
562 static bool has_pid_permissions(struct pid_namespace
*pid
,
563 struct task_struct
*task
,
566 if (pid
->hide_pid
< hide_pid_min
)
568 if (in_group_p(pid
->pid_gid
))
570 return ptrace_may_access(task
, PTRACE_MODE_READ
);
574 static int proc_pid_permission(struct inode
*inode
, int mask
)
576 struct pid_namespace
*pid
= inode
->i_sb
->s_fs_info
;
577 struct task_struct
*task
;
580 task
= get_proc_task(inode
);
583 has_perms
= has_pid_permissions(pid
, task
, 1);
584 put_task_struct(task
);
587 if (pid
->hide_pid
== 2) {
589 * Let's make getdents(), stat(), and open()
590 * consistent with each other. If a process
591 * may not stat() a file, it shouldn't be seen
599 return generic_permission(inode
, mask
);
604 static const struct inode_operations proc_def_inode_operations
= {
605 .setattr
= proc_setattr
,
608 #define PROC_BLOCK_SIZE (3*1024) /* 4K page size but our output routines use some slack for overruns */
610 static ssize_t
proc_info_read(struct file
* file
, char __user
* buf
,
611 size_t count
, loff_t
*ppos
)
613 struct inode
* inode
= file
->f_path
.dentry
->d_inode
;
616 struct task_struct
*task
= get_proc_task(inode
);
622 if (count
> PROC_BLOCK_SIZE
)
623 count
= PROC_BLOCK_SIZE
;
626 if (!(page
= __get_free_page(GFP_TEMPORARY
)))
629 length
= PROC_I(inode
)->op
.proc_read(task
, (char*)page
);
632 length
= simple_read_from_buffer(buf
, count
, ppos
, (char *)page
, length
);
635 put_task_struct(task
);
640 static const struct file_operations proc_info_file_operations
= {
641 .read
= proc_info_read
,
642 .llseek
= generic_file_llseek
,
645 static int proc_single_show(struct seq_file
*m
, void *v
)
647 struct inode
*inode
= m
->private;
648 struct pid_namespace
*ns
;
650 struct task_struct
*task
;
653 ns
= inode
->i_sb
->s_fs_info
;
654 pid
= proc_pid(inode
);
655 task
= get_pid_task(pid
, PIDTYPE_PID
);
659 ret
= PROC_I(inode
)->op
.proc_show(m
, ns
, pid
, task
);
661 put_task_struct(task
);
665 static int proc_single_open(struct inode
*inode
, struct file
*filp
)
667 return single_open(filp
, proc_single_show
, inode
);
670 static const struct file_operations proc_single_file_operations
= {
671 .open
= proc_single_open
,
674 .release
= single_release
,
677 static int __mem_open(struct inode
*inode
, struct file
*file
, unsigned int mode
)
679 struct task_struct
*task
= get_proc_task(file
->f_path
.dentry
->d_inode
);
680 struct mm_struct
*mm
;
685 mm
= mm_access(task
, mode
);
686 put_task_struct(task
);
692 /* ensure this mm_struct can't be freed */
693 atomic_inc(&mm
->mm_count
);
694 /* but do not pin its memory */
698 /* OK to pass negative loff_t, we can catch out-of-range */
699 file
->f_mode
|= FMODE_UNSIGNED_OFFSET
;
700 file
->private_data
= mm
;
705 static int mem_open(struct inode
*inode
, struct file
*file
)
707 return __mem_open(inode
, file
, PTRACE_MODE_ATTACH
);
710 static ssize_t
mem_rw(struct file
*file
, char __user
*buf
,
711 size_t count
, loff_t
*ppos
, int write
)
713 struct mm_struct
*mm
= file
->private_data
;
714 unsigned long addr
= *ppos
;
721 page
= (char *)__get_free_page(GFP_TEMPORARY
);
726 if (!atomic_inc_not_zero(&mm
->mm_users
))
730 int this_len
= min_t(int, count
, PAGE_SIZE
);
732 if (write
&& copy_from_user(page
, buf
, this_len
)) {
737 this_len
= access_remote_vm(mm
, addr
, page
, this_len
, write
);
744 if (!write
&& copy_to_user(buf
, page
, this_len
)) {
758 free_page((unsigned long) page
);
762 static ssize_t
mem_read(struct file
*file
, char __user
*buf
,
763 size_t count
, loff_t
*ppos
)
765 return mem_rw(file
, buf
, count
, ppos
, 0);
768 static ssize_t
mem_write(struct file
*file
, const char __user
*buf
,
769 size_t count
, loff_t
*ppos
)
771 return mem_rw(file
, (char __user
*)buf
, count
, ppos
, 1);
774 loff_t
mem_lseek(struct file
*file
, loff_t offset
, int orig
)
778 file
->f_pos
= offset
;
781 file
->f_pos
+= offset
;
786 force_successful_syscall_return();
790 static int mem_release(struct inode
*inode
, struct file
*file
)
792 struct mm_struct
*mm
= file
->private_data
;
798 static const struct file_operations proc_mem_operations
= {
803 .release
= mem_release
,
806 static int environ_open(struct inode
*inode
, struct file
*file
)
808 return __mem_open(inode
, file
, PTRACE_MODE_READ
);
811 static ssize_t
environ_read(struct file
*file
, char __user
*buf
,
812 size_t count
, loff_t
*ppos
)
815 unsigned long src
= *ppos
;
817 struct mm_struct
*mm
= file
->private_data
;
822 page
= (char *)__get_free_page(GFP_TEMPORARY
);
827 if (!atomic_inc_not_zero(&mm
->mm_users
))
830 int this_len
, retval
, max_len
;
832 this_len
= mm
->env_end
- (mm
->env_start
+ src
);
837 max_len
= (count
> PAGE_SIZE
) ? PAGE_SIZE
: count
;
838 this_len
= (this_len
> max_len
) ? max_len
: this_len
;
840 retval
= access_remote_vm(mm
, (mm
->env_start
+ src
),
848 if (copy_to_user(buf
, page
, retval
)) {
862 free_page((unsigned long) page
);
866 static const struct file_operations proc_environ_operations
= {
867 .open
= environ_open
,
868 .read
= environ_read
,
869 .llseek
= generic_file_llseek
,
870 .release
= mem_release
,
873 static ssize_t
oom_adjust_read(struct file
*file
, char __user
*buf
,
874 size_t count
, loff_t
*ppos
)
876 struct task_struct
*task
= get_proc_task(file
->f_path
.dentry
->d_inode
);
877 char buffer
[PROC_NUMBUF
];
879 int oom_adjust
= OOM_DISABLE
;
885 if (lock_task_sighand(task
, &flags
)) {
886 oom_adjust
= task
->signal
->oom_adj
;
887 unlock_task_sighand(task
, &flags
);
890 put_task_struct(task
);
892 len
= snprintf(buffer
, sizeof(buffer
), "%i\n", oom_adjust
);
894 return simple_read_from_buffer(buf
, count
, ppos
, buffer
, len
);
897 static ssize_t
oom_adjust_write(struct file
*file
, const char __user
*buf
,
898 size_t count
, loff_t
*ppos
)
900 struct task_struct
*task
;
901 char buffer
[PROC_NUMBUF
];
906 memset(buffer
, 0, sizeof(buffer
));
907 if (count
> sizeof(buffer
) - 1)
908 count
= sizeof(buffer
) - 1;
909 if (copy_from_user(buffer
, buf
, count
)) {
914 err
= kstrtoint(strstrip(buffer
), 0, &oom_adjust
);
917 if ((oom_adjust
< OOM_ADJUST_MIN
|| oom_adjust
> OOM_ADJUST_MAX
) &&
918 oom_adjust
!= OOM_DISABLE
) {
923 task
= get_proc_task(file
->f_path
.dentry
->d_inode
);
935 if (!lock_task_sighand(task
, &flags
)) {
940 if (oom_adjust
< task
->signal
->oom_adj
&& !capable(CAP_SYS_RESOURCE
)) {
946 * Warn that /proc/pid/oom_adj is deprecated, see
947 * Documentation/feature-removal-schedule.txt.
949 printk_once(KERN_WARNING
"%s (%d): /proc/%d/oom_adj is deprecated, please use /proc/%d/oom_score_adj instead.\n",
950 current
->comm
, task_pid_nr(current
), task_pid_nr(task
),
952 task
->signal
->oom_adj
= oom_adjust
;
954 * Scale /proc/pid/oom_score_adj appropriately ensuring that a maximum
955 * value is always attainable.
957 if (task
->signal
->oom_adj
== OOM_ADJUST_MAX
)
958 task
->signal
->oom_score_adj
= OOM_SCORE_ADJ_MAX
;
960 task
->signal
->oom_score_adj
= (oom_adjust
* OOM_SCORE_ADJ_MAX
) /
962 trace_oom_score_adj_update(task
);
964 unlock_task_sighand(task
, &flags
);
967 put_task_struct(task
);
969 return err
< 0 ? err
: count
;
972 static const struct file_operations proc_oom_adjust_operations
= {
973 .read
= oom_adjust_read
,
974 .write
= oom_adjust_write
,
975 .llseek
= generic_file_llseek
,
978 static ssize_t
oom_score_adj_read(struct file
*file
, char __user
*buf
,
979 size_t count
, loff_t
*ppos
)
981 struct task_struct
*task
= get_proc_task(file
->f_path
.dentry
->d_inode
);
982 char buffer
[PROC_NUMBUF
];
983 int oom_score_adj
= OOM_SCORE_ADJ_MIN
;
989 if (lock_task_sighand(task
, &flags
)) {
990 oom_score_adj
= task
->signal
->oom_score_adj
;
991 unlock_task_sighand(task
, &flags
);
993 put_task_struct(task
);
994 len
= snprintf(buffer
, sizeof(buffer
), "%d\n", oom_score_adj
);
995 return simple_read_from_buffer(buf
, count
, ppos
, buffer
, len
);
998 static ssize_t
oom_score_adj_write(struct file
*file
, const char __user
*buf
,
999 size_t count
, loff_t
*ppos
)
1001 struct task_struct
*task
;
1002 char buffer
[PROC_NUMBUF
];
1003 unsigned long flags
;
1007 memset(buffer
, 0, sizeof(buffer
));
1008 if (count
> sizeof(buffer
) - 1)
1009 count
= sizeof(buffer
) - 1;
1010 if (copy_from_user(buffer
, buf
, count
)) {
1015 err
= kstrtoint(strstrip(buffer
), 0, &oom_score_adj
);
1018 if (oom_score_adj
< OOM_SCORE_ADJ_MIN
||
1019 oom_score_adj
> OOM_SCORE_ADJ_MAX
) {
1024 task
= get_proc_task(file
->f_path
.dentry
->d_inode
);
1036 if (!lock_task_sighand(task
, &flags
)) {
1041 if (oom_score_adj
< task
->signal
->oom_score_adj_min
&&
1042 !capable(CAP_SYS_RESOURCE
)) {
1047 task
->signal
->oom_score_adj
= oom_score_adj
;
1048 if (has_capability_noaudit(current
, CAP_SYS_RESOURCE
))
1049 task
->signal
->oom_score_adj_min
= oom_score_adj
;
1050 trace_oom_score_adj_update(task
);
1052 * Scale /proc/pid/oom_adj appropriately ensuring that OOM_DISABLE is
1053 * always attainable.
1055 if (task
->signal
->oom_score_adj
== OOM_SCORE_ADJ_MIN
)
1056 task
->signal
->oom_adj
= OOM_DISABLE
;
1058 task
->signal
->oom_adj
= (oom_score_adj
* OOM_ADJUST_MAX
) /
1061 unlock_task_sighand(task
, &flags
);
1064 put_task_struct(task
);
1066 return err
< 0 ? err
: count
;
1069 static const struct file_operations proc_oom_score_adj_operations
= {
1070 .read
= oom_score_adj_read
,
1071 .write
= oom_score_adj_write
,
1072 .llseek
= default_llseek
,
1075 #ifdef CONFIG_AUDITSYSCALL
1076 #define TMPBUFLEN 21
1077 static ssize_t
proc_loginuid_read(struct file
* file
, char __user
* buf
,
1078 size_t count
, loff_t
*ppos
)
1080 struct inode
* inode
= file
->f_path
.dentry
->d_inode
;
1081 struct task_struct
*task
= get_proc_task(inode
);
1083 char tmpbuf
[TMPBUFLEN
];
1087 length
= scnprintf(tmpbuf
, TMPBUFLEN
, "%u",
1088 audit_get_loginuid(task
));
1089 put_task_struct(task
);
1090 return simple_read_from_buffer(buf
, count
, ppos
, tmpbuf
, length
);
1093 static ssize_t
proc_loginuid_write(struct file
* file
, const char __user
* buf
,
1094 size_t count
, loff_t
*ppos
)
1096 struct inode
* inode
= file
->f_path
.dentry
->d_inode
;
1102 if (current
!= pid_task(proc_pid(inode
), PIDTYPE_PID
)) {
1108 if (count
>= PAGE_SIZE
)
1109 count
= PAGE_SIZE
- 1;
1112 /* No partial writes. */
1115 page
= (char*)__get_free_page(GFP_TEMPORARY
);
1119 if (copy_from_user(page
, buf
, count
))
1123 loginuid
= simple_strtoul(page
, &tmp
, 10);
1129 length
= audit_set_loginuid(loginuid
);
1130 if (likely(length
== 0))
1134 free_page((unsigned long) page
);
1138 static const struct file_operations proc_loginuid_operations
= {
1139 .read
= proc_loginuid_read
,
1140 .write
= proc_loginuid_write
,
1141 .llseek
= generic_file_llseek
,
1144 static ssize_t
proc_sessionid_read(struct file
* file
, char __user
* buf
,
1145 size_t count
, loff_t
*ppos
)
1147 struct inode
* inode
= file
->f_path
.dentry
->d_inode
;
1148 struct task_struct
*task
= get_proc_task(inode
);
1150 char tmpbuf
[TMPBUFLEN
];
1154 length
= scnprintf(tmpbuf
, TMPBUFLEN
, "%u",
1155 audit_get_sessionid(task
));
1156 put_task_struct(task
);
1157 return simple_read_from_buffer(buf
, count
, ppos
, tmpbuf
, length
);
1160 static const struct file_operations proc_sessionid_operations
= {
1161 .read
= proc_sessionid_read
,
1162 .llseek
= generic_file_llseek
,
1166 #ifdef CONFIG_FAULT_INJECTION
1167 static ssize_t
proc_fault_inject_read(struct file
* file
, char __user
* buf
,
1168 size_t count
, loff_t
*ppos
)
1170 struct task_struct
*task
= get_proc_task(file
->f_dentry
->d_inode
);
1171 char buffer
[PROC_NUMBUF
];
1177 make_it_fail
= task
->make_it_fail
;
1178 put_task_struct(task
);
1180 len
= snprintf(buffer
, sizeof(buffer
), "%i\n", make_it_fail
);
1182 return simple_read_from_buffer(buf
, count
, ppos
, buffer
, len
);
1185 static ssize_t
proc_fault_inject_write(struct file
* file
,
1186 const char __user
* buf
, size_t count
, loff_t
*ppos
)
1188 struct task_struct
*task
;
1189 char buffer
[PROC_NUMBUF
], *end
;
1192 if (!capable(CAP_SYS_RESOURCE
))
1194 memset(buffer
, 0, sizeof(buffer
));
1195 if (count
> sizeof(buffer
) - 1)
1196 count
= sizeof(buffer
) - 1;
1197 if (copy_from_user(buffer
, buf
, count
))
1199 make_it_fail
= simple_strtol(strstrip(buffer
), &end
, 0);
1202 task
= get_proc_task(file
->f_dentry
->d_inode
);
1205 task
->make_it_fail
= make_it_fail
;
1206 put_task_struct(task
);
1211 static const struct file_operations proc_fault_inject_operations
= {
1212 .read
= proc_fault_inject_read
,
1213 .write
= proc_fault_inject_write
,
1214 .llseek
= generic_file_llseek
,
1219 #ifdef CONFIG_SCHED_DEBUG
1221 * Print out various scheduling related per-task fields:
1223 static int sched_show(struct seq_file
*m
, void *v
)
1225 struct inode
*inode
= m
->private;
1226 struct task_struct
*p
;
1228 p
= get_proc_task(inode
);
1231 proc_sched_show_task(p
, m
);
1239 sched_write(struct file
*file
, const char __user
*buf
,
1240 size_t count
, loff_t
*offset
)
1242 struct inode
*inode
= file
->f_path
.dentry
->d_inode
;
1243 struct task_struct
*p
;
1245 p
= get_proc_task(inode
);
1248 proc_sched_set_task(p
);
1255 static int sched_open(struct inode
*inode
, struct file
*filp
)
1257 return single_open(filp
, sched_show
, inode
);
1260 static const struct file_operations proc_pid_sched_operations
= {
1263 .write
= sched_write
,
1264 .llseek
= seq_lseek
,
1265 .release
= single_release
,
1270 #ifdef CONFIG_SCHED_AUTOGROUP
1272 * Print out autogroup related information:
1274 static int sched_autogroup_show(struct seq_file
*m
, void *v
)
1276 struct inode
*inode
= m
->private;
1277 struct task_struct
*p
;
1279 p
= get_proc_task(inode
);
1282 proc_sched_autogroup_show_task(p
, m
);
1290 sched_autogroup_write(struct file
*file
, const char __user
*buf
,
1291 size_t count
, loff_t
*offset
)
1293 struct inode
*inode
= file
->f_path
.dentry
->d_inode
;
1294 struct task_struct
*p
;
1295 char buffer
[PROC_NUMBUF
];
1299 memset(buffer
, 0, sizeof(buffer
));
1300 if (count
> sizeof(buffer
) - 1)
1301 count
= sizeof(buffer
) - 1;
1302 if (copy_from_user(buffer
, buf
, count
))
1305 err
= kstrtoint(strstrip(buffer
), 0, &nice
);
1309 p
= get_proc_task(inode
);
1313 err
= proc_sched_autogroup_set_nice(p
, nice
);
1322 static int sched_autogroup_open(struct inode
*inode
, struct file
*filp
)
1326 ret
= single_open(filp
, sched_autogroup_show
, NULL
);
1328 struct seq_file
*m
= filp
->private_data
;
1335 static const struct file_operations proc_pid_sched_autogroup_operations
= {
1336 .open
= sched_autogroup_open
,
1338 .write
= sched_autogroup_write
,
1339 .llseek
= seq_lseek
,
1340 .release
= single_release
,
1343 #endif /* CONFIG_SCHED_AUTOGROUP */
1345 static ssize_t
comm_write(struct file
*file
, const char __user
*buf
,
1346 size_t count
, loff_t
*offset
)
1348 struct inode
*inode
= file
->f_path
.dentry
->d_inode
;
1349 struct task_struct
*p
;
1350 char buffer
[TASK_COMM_LEN
];
1352 memset(buffer
, 0, sizeof(buffer
));
1353 if (count
> sizeof(buffer
) - 1)
1354 count
= sizeof(buffer
) - 1;
1355 if (copy_from_user(buffer
, buf
, count
))
1358 p
= get_proc_task(inode
);
1362 if (same_thread_group(current
, p
))
1363 set_task_comm(p
, buffer
);
1372 static int comm_show(struct seq_file
*m
, void *v
)
1374 struct inode
*inode
= m
->private;
1375 struct task_struct
*p
;
1377 p
= get_proc_task(inode
);
1382 seq_printf(m
, "%s\n", p
->comm
);
1390 static int comm_open(struct inode
*inode
, struct file
*filp
)
1392 return single_open(filp
, comm_show
, inode
);
1395 static const struct file_operations proc_pid_set_comm_operations
= {
1398 .write
= comm_write
,
1399 .llseek
= seq_lseek
,
1400 .release
= single_release
,
1403 static int proc_exe_link(struct dentry
*dentry
, struct path
*exe_path
)
1405 struct task_struct
*task
;
1406 struct mm_struct
*mm
;
1407 struct file
*exe_file
;
1409 task
= get_proc_task(dentry
->d_inode
);
1412 mm
= get_task_mm(task
);
1413 put_task_struct(task
);
1416 exe_file
= get_mm_exe_file(mm
);
1419 *exe_path
= exe_file
->f_path
;
1420 path_get(&exe_file
->f_path
);
1427 static void *proc_pid_follow_link(struct dentry
*dentry
, struct nameidata
*nd
)
1429 struct inode
*inode
= dentry
->d_inode
;
1430 int error
= -EACCES
;
1432 /* We don't need a base pointer in the /proc filesystem */
1433 path_put(&nd
->path
);
1435 /* Are we allowed to snoop on the tasks file descriptors? */
1436 if (!proc_fd_access_allowed(inode
))
1439 error
= PROC_I(inode
)->op
.proc_get_link(dentry
, &nd
->path
);
1441 return ERR_PTR(error
);
1444 static int do_proc_readlink(struct path
*path
, char __user
*buffer
, int buflen
)
1446 char *tmp
= (char*)__get_free_page(GFP_TEMPORARY
);
1453 pathname
= d_path(path
, tmp
, PAGE_SIZE
);
1454 len
= PTR_ERR(pathname
);
1455 if (IS_ERR(pathname
))
1457 len
= tmp
+ PAGE_SIZE
- 1 - pathname
;
1461 if (copy_to_user(buffer
, pathname
, len
))
1464 free_page((unsigned long)tmp
);
1468 static int proc_pid_readlink(struct dentry
* dentry
, char __user
* buffer
, int buflen
)
1470 int error
= -EACCES
;
1471 struct inode
*inode
= dentry
->d_inode
;
1474 /* Are we allowed to snoop on the tasks file descriptors? */
1475 if (!proc_fd_access_allowed(inode
))
1478 error
= PROC_I(inode
)->op
.proc_get_link(dentry
, &path
);
1482 error
= do_proc_readlink(&path
, buffer
, buflen
);
1488 static const struct inode_operations proc_pid_link_inode_operations
= {
1489 .readlink
= proc_pid_readlink
,
1490 .follow_link
= proc_pid_follow_link
,
1491 .setattr
= proc_setattr
,
1495 /* building an inode */
1497 static int task_dumpable(struct task_struct
*task
)
1500 struct mm_struct
*mm
;
1505 dumpable
= get_dumpable(mm
);
1512 struct inode
*proc_pid_make_inode(struct super_block
* sb
, struct task_struct
*task
)
1514 struct inode
* inode
;
1515 struct proc_inode
*ei
;
1516 const struct cred
*cred
;
1518 /* We need a new inode */
1520 inode
= new_inode(sb
);
1526 inode
->i_ino
= get_next_ino();
1527 inode
->i_mtime
= inode
->i_atime
= inode
->i_ctime
= CURRENT_TIME
;
1528 inode
->i_op
= &proc_def_inode_operations
;
1531 * grab the reference to task.
1533 ei
->pid
= get_task_pid(task
, PIDTYPE_PID
);
1537 if (task_dumpable(task
)) {
1539 cred
= __task_cred(task
);
1540 inode
->i_uid
= cred
->euid
;
1541 inode
->i_gid
= cred
->egid
;
1544 security_task_to_inode(task
, inode
);
1554 int pid_getattr(struct vfsmount
*mnt
, struct dentry
*dentry
, struct kstat
*stat
)
1556 struct inode
*inode
= dentry
->d_inode
;
1557 struct task_struct
*task
;
1558 const struct cred
*cred
;
1559 struct pid_namespace
*pid
= dentry
->d_sb
->s_fs_info
;
1561 generic_fillattr(inode
, stat
);
1564 stat
->uid
= GLOBAL_ROOT_UID
;
1565 stat
->gid
= GLOBAL_ROOT_GID
;
1566 task
= pid_task(proc_pid(inode
), PIDTYPE_PID
);
1568 if (!has_pid_permissions(pid
, task
, 2)) {
1571 * This doesn't prevent learning whether PID exists,
1572 * it only makes getattr() consistent with readdir().
1576 if ((inode
->i_mode
== (S_IFDIR
|S_IRUGO
|S_IXUGO
)) ||
1577 task_dumpable(task
)) {
1578 cred
= __task_cred(task
);
1579 stat
->uid
= cred
->euid
;
1580 stat
->gid
= cred
->egid
;
1590 * Exceptional case: normally we are not allowed to unhash a busy
1591 * directory. In this case, however, we can do it - no aliasing problems
1592 * due to the way we treat inodes.
1594 * Rewrite the inode's ownerships here because the owning task may have
1595 * performed a setuid(), etc.
1597 * Before the /proc/pid/status file was created the only way to read
1598 * the effective uid of a /process was to stat /proc/pid. Reading
1599 * /proc/pid/status is slow enough that procps and other packages
1600 * kept stating /proc/pid. To keep the rules in /proc simple I have
1601 * made this apply to all per process world readable and executable
1604 int pid_revalidate(struct dentry
*dentry
, struct nameidata
*nd
)
1606 struct inode
*inode
;
1607 struct task_struct
*task
;
1608 const struct cred
*cred
;
1610 if (nd
&& nd
->flags
& LOOKUP_RCU
)
1613 inode
= dentry
->d_inode
;
1614 task
= get_proc_task(inode
);
1617 if ((inode
->i_mode
== (S_IFDIR
|S_IRUGO
|S_IXUGO
)) ||
1618 task_dumpable(task
)) {
1620 cred
= __task_cred(task
);
1621 inode
->i_uid
= cred
->euid
;
1622 inode
->i_gid
= cred
->egid
;
1625 inode
->i_uid
= GLOBAL_ROOT_UID
;
1626 inode
->i_gid
= GLOBAL_ROOT_GID
;
1628 inode
->i_mode
&= ~(S_ISUID
| S_ISGID
);
1629 security_task_to_inode(task
, inode
);
1630 put_task_struct(task
);
1637 static int pid_delete_dentry(const struct dentry
* dentry
)
1639 /* Is the task we represent dead?
1640 * If so, then don't put the dentry on the lru list,
1641 * kill it immediately.
1643 return !proc_pid(dentry
->d_inode
)->tasks
[PIDTYPE_PID
].first
;
1646 const struct dentry_operations pid_dentry_operations
=
1648 .d_revalidate
= pid_revalidate
,
1649 .d_delete
= pid_delete_dentry
,
1655 * Fill a directory entry.
1657 * If possible create the dcache entry and derive our inode number and
1658 * file type from dcache entry.
1660 * Since all of the proc inode numbers are dynamically generated, the inode
1661 * numbers do not exist until the inode is cache. This means creating the
1662 * the dcache entry in readdir is necessary to keep the inode numbers
1663 * reported by readdir in sync with the inode numbers reported
1666 int proc_fill_cache(struct file
*filp
, void *dirent
, filldir_t filldir
,
1667 const char *name
, int len
,
1668 instantiate_t instantiate
, struct task_struct
*task
, const void *ptr
)
1670 struct dentry
*child
, *dir
= filp
->f_path
.dentry
;
1671 struct inode
*inode
;
1674 unsigned type
= DT_UNKNOWN
;
1678 qname
.hash
= full_name_hash(name
, len
);
1680 child
= d_lookup(dir
, &qname
);
1683 new = d_alloc(dir
, &qname
);
1685 child
= instantiate(dir
->d_inode
, new, task
, ptr
);
1692 if (!child
|| IS_ERR(child
) || !child
->d_inode
)
1693 goto end_instantiate
;
1694 inode
= child
->d_inode
;
1697 type
= inode
->i_mode
>> 12;
1702 ino
= find_inode_number(dir
, &qname
);
1705 return filldir(dirent
, name
, len
, filp
->f_pos
, ino
, type
);
1708 static unsigned name_to_int(struct dentry
*dentry
)
1710 const char *name
= dentry
->d_name
.name
;
1711 int len
= dentry
->d_name
.len
;
1714 if (len
> 1 && *name
== '0')
1717 unsigned c
= *name
++ - '0';
1720 if (n
>= (~0U-9)/10)
1730 #define PROC_FDINFO_MAX 64
1732 static int proc_fd_info(struct inode
*inode
, struct path
*path
, char *info
)
1734 struct task_struct
*task
= get_proc_task(inode
);
1735 struct files_struct
*files
= NULL
;
1737 int fd
= proc_fd(inode
);
1740 files
= get_files_struct(task
);
1741 put_task_struct(task
);
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
);
1751 unsigned int f_flags
;
1752 struct fdtable
*fdt
;
1754 fdt
= files_fdtable(files
);
1755 f_flags
= file
->f_flags
& ~O_CLOEXEC
;
1756 if (close_on_exec(fd
, fdt
))
1757 f_flags
|= O_CLOEXEC
;
1760 *path
= file
->f_path
;
1761 path_get(&file
->f_path
);
1764 snprintf(info
, PROC_FDINFO_MAX
,
1767 (long long) file
->f_pos
,
1769 spin_unlock(&files
->file_lock
);
1770 put_files_struct(files
);
1773 spin_unlock(&files
->file_lock
);
1774 put_files_struct(files
);
1779 static int proc_fd_link(struct dentry
*dentry
, struct path
*path
)
1781 return proc_fd_info(dentry
->d_inode
, path
, NULL
);
1784 static int tid_fd_revalidate(struct dentry
*dentry
, struct nameidata
*nd
)
1786 struct inode
*inode
;
1787 struct task_struct
*task
;
1789 struct files_struct
*files
;
1790 const struct cred
*cred
;
1792 if (nd
&& nd
->flags
& LOOKUP_RCU
)
1795 inode
= dentry
->d_inode
;
1796 task
= get_proc_task(inode
);
1797 fd
= proc_fd(inode
);
1800 files
= get_files_struct(task
);
1804 file
= fcheck_files(files
, fd
);
1806 unsigned i_mode
, f_mode
= file
->f_mode
;
1809 put_files_struct(files
);
1811 if (task_dumpable(task
)) {
1813 cred
= __task_cred(task
);
1814 inode
->i_uid
= cred
->euid
;
1815 inode
->i_gid
= cred
->egid
;
1818 inode
->i_uid
= GLOBAL_ROOT_UID
;
1819 inode
->i_gid
= GLOBAL_ROOT_GID
;
1823 if (f_mode
& FMODE_READ
)
1824 i_mode
|= S_IRUSR
| S_IXUSR
;
1825 if (f_mode
& FMODE_WRITE
)
1826 i_mode
|= S_IWUSR
| S_IXUSR
;
1827 inode
->i_mode
= i_mode
;
1829 security_task_to_inode(task
, inode
);
1830 put_task_struct(task
);
1834 put_files_struct(files
);
1836 put_task_struct(task
);
1842 static const struct dentry_operations tid_fd_dentry_operations
=
1844 .d_revalidate
= tid_fd_revalidate
,
1845 .d_delete
= pid_delete_dentry
,
1848 static struct dentry
*proc_fd_instantiate(struct inode
*dir
,
1849 struct dentry
*dentry
, struct task_struct
*task
, const void *ptr
)
1851 unsigned fd
= (unsigned long)ptr
;
1852 struct inode
*inode
;
1853 struct proc_inode
*ei
;
1854 struct dentry
*error
= ERR_PTR(-ENOENT
);
1856 inode
= proc_pid_make_inode(dir
->i_sb
, task
);
1862 inode
->i_op
= &proc_pid_link_inode_operations
;
1864 ei
->op
.proc_get_link
= proc_fd_link
;
1865 d_set_d_op(dentry
, &tid_fd_dentry_operations
);
1866 d_add(dentry
, inode
);
1867 /* Close the race of the process dying before we return the dentry */
1868 if (tid_fd_revalidate(dentry
, NULL
))
1875 static struct dentry
*proc_lookupfd_common(struct inode
*dir
,
1876 struct dentry
*dentry
,
1877 instantiate_t instantiate
)
1879 struct task_struct
*task
= get_proc_task(dir
);
1880 unsigned fd
= name_to_int(dentry
);
1881 struct dentry
*result
= ERR_PTR(-ENOENT
);
1888 result
= instantiate(dir
, dentry
, task
, (void *)(unsigned long)fd
);
1890 put_task_struct(task
);
1895 static int proc_readfd_common(struct file
* filp
, void * dirent
,
1896 filldir_t filldir
, instantiate_t instantiate
)
1898 struct dentry
*dentry
= filp
->f_path
.dentry
;
1899 struct inode
*inode
= dentry
->d_inode
;
1900 struct task_struct
*p
= get_proc_task(inode
);
1901 unsigned int fd
, ino
;
1903 struct files_struct
* files
;
1913 if (filldir(dirent
, ".", 1, 0, inode
->i_ino
, DT_DIR
) < 0)
1917 ino
= parent_ino(dentry
);
1918 if (filldir(dirent
, "..", 2, 1, ino
, DT_DIR
) < 0)
1922 files
= get_files_struct(p
);
1926 for (fd
= filp
->f_pos
-2;
1927 fd
< files_fdtable(files
)->max_fds
;
1928 fd
++, filp
->f_pos
++) {
1929 char name
[PROC_NUMBUF
];
1933 if (!fcheck_files(files
, fd
))
1937 len
= snprintf(name
, sizeof(name
), "%d", fd
);
1938 rv
= proc_fill_cache(filp
, dirent
, filldir
,
1939 name
, len
, instantiate
, p
,
1940 (void *)(unsigned long)fd
);
1947 put_files_struct(files
);
1955 static struct dentry
*proc_lookupfd(struct inode
*dir
, struct dentry
*dentry
,
1956 struct nameidata
*nd
)
1958 return proc_lookupfd_common(dir
, dentry
, proc_fd_instantiate
);
1961 static int proc_readfd(struct file
*filp
, void *dirent
, filldir_t filldir
)
1963 return proc_readfd_common(filp
, dirent
, filldir
, proc_fd_instantiate
);
1966 static ssize_t
proc_fdinfo_read(struct file
*file
, char __user
*buf
,
1967 size_t len
, loff_t
*ppos
)
1969 char tmp
[PROC_FDINFO_MAX
];
1970 int err
= proc_fd_info(file
->f_path
.dentry
->d_inode
, NULL
, tmp
);
1972 err
= simple_read_from_buffer(buf
, len
, ppos
, tmp
, strlen(tmp
));
1976 static const struct file_operations proc_fdinfo_file_operations
= {
1977 .open
= nonseekable_open
,
1978 .read
= proc_fdinfo_read
,
1979 .llseek
= no_llseek
,
1982 static const struct file_operations proc_fd_operations
= {
1983 .read
= generic_read_dir
,
1984 .readdir
= proc_readfd
,
1985 .llseek
= default_llseek
,
1988 #ifdef CONFIG_CHECKPOINT_RESTORE
1991 * dname_to_vma_addr - maps a dentry name into two unsigned longs
1992 * which represent vma start and end addresses.
1994 static int dname_to_vma_addr(struct dentry
*dentry
,
1995 unsigned long *start
, unsigned long *end
)
1997 if (sscanf(dentry
->d_name
.name
, "%lx-%lx", start
, end
) != 2)
2003 static int map_files_d_revalidate(struct dentry
*dentry
, struct nameidata
*nd
)
2005 unsigned long vm_start
, vm_end
;
2006 bool exact_vma_exists
= false;
2007 struct mm_struct
*mm
= NULL
;
2008 struct task_struct
*task
;
2009 const struct cred
*cred
;
2010 struct inode
*inode
;
2013 if (nd
&& nd
->flags
& LOOKUP_RCU
)
2016 if (!capable(CAP_SYS_ADMIN
)) {
2021 inode
= dentry
->d_inode
;
2022 task
= get_proc_task(inode
);
2026 mm
= mm_access(task
, PTRACE_MODE_READ
);
2027 if (IS_ERR_OR_NULL(mm
))
2030 if (!dname_to_vma_addr(dentry
, &vm_start
, &vm_end
)) {
2031 down_read(&mm
->mmap_sem
);
2032 exact_vma_exists
= !!find_exact_vma(mm
, vm_start
, vm_end
);
2033 up_read(&mm
->mmap_sem
);
2038 if (exact_vma_exists
) {
2039 if (task_dumpable(task
)) {
2041 cred
= __task_cred(task
);
2042 inode
->i_uid
= cred
->euid
;
2043 inode
->i_gid
= cred
->egid
;
2046 inode
->i_uid
= GLOBAL_ROOT_UID
;
2047 inode
->i_gid
= GLOBAL_ROOT_GID
;
2049 security_task_to_inode(task
, inode
);
2054 put_task_struct(task
);
2063 static const struct dentry_operations tid_map_files_dentry_operations
= {
2064 .d_revalidate
= map_files_d_revalidate
,
2065 .d_delete
= pid_delete_dentry
,
2068 static int proc_map_files_get_link(struct dentry
*dentry
, struct path
*path
)
2070 unsigned long vm_start
, vm_end
;
2071 struct vm_area_struct
*vma
;
2072 struct task_struct
*task
;
2073 struct mm_struct
*mm
;
2077 task
= get_proc_task(dentry
->d_inode
);
2081 mm
= get_task_mm(task
);
2082 put_task_struct(task
);
2086 rc
= dname_to_vma_addr(dentry
, &vm_start
, &vm_end
);
2090 down_read(&mm
->mmap_sem
);
2091 vma
= find_exact_vma(mm
, vm_start
, vm_end
);
2092 if (vma
&& vma
->vm_file
) {
2093 *path
= vma
->vm_file
->f_path
;
2097 up_read(&mm
->mmap_sem
);
2105 struct map_files_info
{
2108 unsigned char name
[4*sizeof(long)+2]; /* max: %lx-%lx\0 */
2111 static struct dentry
*
2112 proc_map_files_instantiate(struct inode
*dir
, struct dentry
*dentry
,
2113 struct task_struct
*task
, const void *ptr
)
2115 const struct file
*file
= ptr
;
2116 struct proc_inode
*ei
;
2117 struct inode
*inode
;
2120 return ERR_PTR(-ENOENT
);
2122 inode
= proc_pid_make_inode(dir
->i_sb
, task
);
2124 return ERR_PTR(-ENOENT
);
2127 ei
->op
.proc_get_link
= proc_map_files_get_link
;
2129 inode
->i_op
= &proc_pid_link_inode_operations
;
2131 inode
->i_mode
= S_IFLNK
;
2133 if (file
->f_mode
& FMODE_READ
)
2134 inode
->i_mode
|= S_IRUSR
;
2135 if (file
->f_mode
& FMODE_WRITE
)
2136 inode
->i_mode
|= S_IWUSR
;
2138 d_set_d_op(dentry
, &tid_map_files_dentry_operations
);
2139 d_add(dentry
, inode
);
2144 static struct dentry
*proc_map_files_lookup(struct inode
*dir
,
2145 struct dentry
*dentry
, struct nameidata
*nd
)
2147 unsigned long vm_start
, vm_end
;
2148 struct vm_area_struct
*vma
;
2149 struct task_struct
*task
;
2150 struct dentry
*result
;
2151 struct mm_struct
*mm
;
2153 result
= ERR_PTR(-EACCES
);
2154 if (!capable(CAP_SYS_ADMIN
))
2157 result
= ERR_PTR(-ENOENT
);
2158 task
= get_proc_task(dir
);
2162 result
= ERR_PTR(-EACCES
);
2163 if (!ptrace_may_access(task
, PTRACE_MODE_READ
))
2166 result
= ERR_PTR(-ENOENT
);
2167 if (dname_to_vma_addr(dentry
, &vm_start
, &vm_end
))
2170 mm
= get_task_mm(task
);
2174 down_read(&mm
->mmap_sem
);
2175 vma
= find_exact_vma(mm
, vm_start
, vm_end
);
2179 result
= proc_map_files_instantiate(dir
, dentry
, task
, vma
->vm_file
);
2182 up_read(&mm
->mmap_sem
);
2185 put_task_struct(task
);
2190 static const struct inode_operations proc_map_files_inode_operations
= {
2191 .lookup
= proc_map_files_lookup
,
2192 .permission
= proc_fd_permission
,
2193 .setattr
= proc_setattr
,
2197 proc_map_files_readdir(struct file
*filp
, void *dirent
, filldir_t filldir
)
2199 struct dentry
*dentry
= filp
->f_path
.dentry
;
2200 struct inode
*inode
= dentry
->d_inode
;
2201 struct vm_area_struct
*vma
;
2202 struct task_struct
*task
;
2203 struct mm_struct
*mm
;
2208 if (!capable(CAP_SYS_ADMIN
))
2212 task
= get_proc_task(inode
);
2217 if (!ptrace_may_access(task
, PTRACE_MODE_READ
))
2221 switch (filp
->f_pos
) {
2224 if (filldir(dirent
, ".", 1, 0, ino
, DT_DIR
) < 0)
2228 ino
= parent_ino(dentry
);
2229 if (filldir(dirent
, "..", 2, 1, ino
, DT_DIR
) < 0)
2234 unsigned long nr_files
, pos
, i
;
2235 struct flex_array
*fa
= NULL
;
2236 struct map_files_info info
;
2237 struct map_files_info
*p
;
2239 mm
= get_task_mm(task
);
2242 down_read(&mm
->mmap_sem
);
2247 * We need two passes here:
2249 * 1) Collect vmas of mapped files with mmap_sem taken
2250 * 2) Release mmap_sem and instantiate entries
2252 * otherwise we get lockdep complained, since filldir()
2253 * routine might require mmap_sem taken in might_fault().
2256 for (vma
= mm
->mmap
, pos
= 2; vma
; vma
= vma
->vm_next
) {
2257 if (vma
->vm_file
&& ++pos
> filp
->f_pos
)
2262 fa
= flex_array_alloc(sizeof(info
), nr_files
,
2264 if (!fa
|| flex_array_prealloc(fa
, 0, nr_files
,
2268 flex_array_free(fa
);
2269 up_read(&mm
->mmap_sem
);
2273 for (i
= 0, vma
= mm
->mmap
, pos
= 2; vma
;
2274 vma
= vma
->vm_next
) {
2277 if (++pos
<= filp
->f_pos
)
2280 get_file(vma
->vm_file
);
2281 info
.file
= vma
->vm_file
;
2282 info
.len
= snprintf(info
.name
,
2283 sizeof(info
.name
), "%lx-%lx",
2284 vma
->vm_start
, vma
->vm_end
);
2285 if (flex_array_put(fa
, i
++, &info
, GFP_KERNEL
))
2289 up_read(&mm
->mmap_sem
);
2291 for (i
= 0; i
< nr_files
; i
++) {
2292 p
= flex_array_get(fa
, i
);
2293 ret
= proc_fill_cache(filp
, dirent
, filldir
,
2295 proc_map_files_instantiate
,
2302 for (; i
< nr_files
; i
++) {
2304 * In case of error don't forget
2305 * to put rest of file refs.
2307 p
= flex_array_get(fa
, i
);
2311 flex_array_free(fa
);
2317 put_task_struct(task
);
2322 static const struct file_operations proc_map_files_operations
= {
2323 .read
= generic_read_dir
,
2324 .readdir
= proc_map_files_readdir
,
2325 .llseek
= default_llseek
,
2328 #endif /* CONFIG_CHECKPOINT_RESTORE */
2331 * /proc/pid/fd needs a special permission handler so that a process can still
2332 * access /proc/self/fd after it has executed a setuid().
2334 static int proc_fd_permission(struct inode
*inode
, int mask
)
2336 int rv
= generic_permission(inode
, mask
);
2339 if (task_pid(current
) == proc_pid(inode
))
2345 * proc directories can do almost nothing..
2347 static const struct inode_operations proc_fd_inode_operations
= {
2348 .lookup
= proc_lookupfd
,
2349 .permission
= proc_fd_permission
,
2350 .setattr
= proc_setattr
,
2353 static struct dentry
*proc_fdinfo_instantiate(struct inode
*dir
,
2354 struct dentry
*dentry
, struct task_struct
*task
, const void *ptr
)
2356 unsigned fd
= (unsigned long)ptr
;
2357 struct inode
*inode
;
2358 struct proc_inode
*ei
;
2359 struct dentry
*error
= ERR_PTR(-ENOENT
);
2361 inode
= proc_pid_make_inode(dir
->i_sb
, task
);
2366 inode
->i_mode
= S_IFREG
| S_IRUSR
;
2367 inode
->i_fop
= &proc_fdinfo_file_operations
;
2368 d_set_d_op(dentry
, &tid_fd_dentry_operations
);
2369 d_add(dentry
, inode
);
2370 /* Close the race of the process dying before we return the dentry */
2371 if (tid_fd_revalidate(dentry
, NULL
))
2378 static struct dentry
*proc_lookupfdinfo(struct inode
*dir
,
2379 struct dentry
*dentry
,
2380 struct nameidata
*nd
)
2382 return proc_lookupfd_common(dir
, dentry
, proc_fdinfo_instantiate
);
2385 static int proc_readfdinfo(struct file
*filp
, void *dirent
, filldir_t filldir
)
2387 return proc_readfd_common(filp
, dirent
, filldir
,
2388 proc_fdinfo_instantiate
);
2391 static const struct file_operations proc_fdinfo_operations
= {
2392 .read
= generic_read_dir
,
2393 .readdir
= proc_readfdinfo
,
2394 .llseek
= default_llseek
,
2398 * proc directories can do almost nothing..
2400 static const struct inode_operations proc_fdinfo_inode_operations
= {
2401 .lookup
= proc_lookupfdinfo
,
2402 .setattr
= proc_setattr
,
2406 static struct dentry
*proc_pident_instantiate(struct inode
*dir
,
2407 struct dentry
*dentry
, struct task_struct
*task
, const void *ptr
)
2409 const struct pid_entry
*p
= ptr
;
2410 struct inode
*inode
;
2411 struct proc_inode
*ei
;
2412 struct dentry
*error
= ERR_PTR(-ENOENT
);
2414 inode
= proc_pid_make_inode(dir
->i_sb
, task
);
2419 inode
->i_mode
= p
->mode
;
2420 if (S_ISDIR(inode
->i_mode
))
2421 set_nlink(inode
, 2); /* Use getattr to fix if necessary */
2423 inode
->i_op
= p
->iop
;
2425 inode
->i_fop
= p
->fop
;
2427 d_set_d_op(dentry
, &pid_dentry_operations
);
2428 d_add(dentry
, inode
);
2429 /* Close the race of the process dying before we return the dentry */
2430 if (pid_revalidate(dentry
, NULL
))
2436 static struct dentry
*proc_pident_lookup(struct inode
*dir
,
2437 struct dentry
*dentry
,
2438 const struct pid_entry
*ents
,
2441 struct dentry
*error
;
2442 struct task_struct
*task
= get_proc_task(dir
);
2443 const struct pid_entry
*p
, *last
;
2445 error
= ERR_PTR(-ENOENT
);
2451 * Yes, it does not scale. And it should not. Don't add
2452 * new entries into /proc/<tgid>/ without very good reasons.
2454 last
= &ents
[nents
- 1];
2455 for (p
= ents
; p
<= last
; p
++) {
2456 if (p
->len
!= dentry
->d_name
.len
)
2458 if (!memcmp(dentry
->d_name
.name
, p
->name
, p
->len
))
2464 error
= proc_pident_instantiate(dir
, dentry
, task
, p
);
2466 put_task_struct(task
);
2471 static int proc_pident_fill_cache(struct file
*filp
, void *dirent
,
2472 filldir_t filldir
, struct task_struct
*task
, const struct pid_entry
*p
)
2474 return proc_fill_cache(filp
, dirent
, filldir
, p
->name
, p
->len
,
2475 proc_pident_instantiate
, task
, p
);
2478 static int proc_pident_readdir(struct file
*filp
,
2479 void *dirent
, filldir_t filldir
,
2480 const struct pid_entry
*ents
, unsigned int nents
)
2483 struct dentry
*dentry
= filp
->f_path
.dentry
;
2484 struct inode
*inode
= dentry
->d_inode
;
2485 struct task_struct
*task
= get_proc_task(inode
);
2486 const struct pid_entry
*p
, *last
;
2499 if (filldir(dirent
, ".", 1, i
, ino
, DT_DIR
) < 0)
2505 ino
= parent_ino(dentry
);
2506 if (filldir(dirent
, "..", 2, i
, ino
, DT_DIR
) < 0)
2518 last
= &ents
[nents
- 1];
2520 if (proc_pident_fill_cache(filp
, dirent
, filldir
, task
, p
) < 0)
2529 put_task_struct(task
);
2534 #ifdef CONFIG_SECURITY
2535 static ssize_t
proc_pid_attr_read(struct file
* file
, char __user
* buf
,
2536 size_t count
, loff_t
*ppos
)
2538 struct inode
* inode
= file
->f_path
.dentry
->d_inode
;
2541 struct task_struct
*task
= get_proc_task(inode
);
2546 length
= security_getprocattr(task
,
2547 (char*)file
->f_path
.dentry
->d_name
.name
,
2549 put_task_struct(task
);
2551 length
= simple_read_from_buffer(buf
, count
, ppos
, p
, length
);
2556 static ssize_t
proc_pid_attr_write(struct file
* file
, const char __user
* buf
,
2557 size_t count
, loff_t
*ppos
)
2559 struct inode
* inode
= file
->f_path
.dentry
->d_inode
;
2562 struct task_struct
*task
= get_proc_task(inode
);
2567 if (count
> PAGE_SIZE
)
2570 /* No partial writes. */
2576 page
= (char*)__get_free_page(GFP_TEMPORARY
);
2581 if (copy_from_user(page
, buf
, count
))
2584 /* Guard against adverse ptrace interaction */
2585 length
= mutex_lock_interruptible(&task
->signal
->cred_guard_mutex
);
2589 length
= security_setprocattr(task
,
2590 (char*)file
->f_path
.dentry
->d_name
.name
,
2591 (void*)page
, count
);
2592 mutex_unlock(&task
->signal
->cred_guard_mutex
);
2594 free_page((unsigned long) page
);
2596 put_task_struct(task
);
2601 static const struct file_operations proc_pid_attr_operations
= {
2602 .read
= proc_pid_attr_read
,
2603 .write
= proc_pid_attr_write
,
2604 .llseek
= generic_file_llseek
,
2607 static const struct pid_entry attr_dir_stuff
[] = {
2608 REG("current", S_IRUGO
|S_IWUGO
, proc_pid_attr_operations
),
2609 REG("prev", S_IRUGO
, proc_pid_attr_operations
),
2610 REG("exec", S_IRUGO
|S_IWUGO
, proc_pid_attr_operations
),
2611 REG("fscreate", S_IRUGO
|S_IWUGO
, proc_pid_attr_operations
),
2612 REG("keycreate", S_IRUGO
|S_IWUGO
, proc_pid_attr_operations
),
2613 REG("sockcreate", S_IRUGO
|S_IWUGO
, proc_pid_attr_operations
),
2616 static int proc_attr_dir_readdir(struct file
* filp
,
2617 void * dirent
, filldir_t filldir
)
2619 return proc_pident_readdir(filp
,dirent
,filldir
,
2620 attr_dir_stuff
,ARRAY_SIZE(attr_dir_stuff
));
2623 static const struct file_operations proc_attr_dir_operations
= {
2624 .read
= generic_read_dir
,
2625 .readdir
= proc_attr_dir_readdir
,
2626 .llseek
= default_llseek
,
2629 static struct dentry
*proc_attr_dir_lookup(struct inode
*dir
,
2630 struct dentry
*dentry
, struct nameidata
*nd
)
2632 return proc_pident_lookup(dir
, dentry
,
2633 attr_dir_stuff
, ARRAY_SIZE(attr_dir_stuff
));
2636 static const struct inode_operations proc_attr_dir_inode_operations
= {
2637 .lookup
= proc_attr_dir_lookup
,
2638 .getattr
= pid_getattr
,
2639 .setattr
= proc_setattr
,
2644 #ifdef CONFIG_ELF_CORE
2645 static ssize_t
proc_coredump_filter_read(struct file
*file
, char __user
*buf
,
2646 size_t count
, loff_t
*ppos
)
2648 struct task_struct
*task
= get_proc_task(file
->f_dentry
->d_inode
);
2649 struct mm_struct
*mm
;
2650 char buffer
[PROC_NUMBUF
];
2658 mm
= get_task_mm(task
);
2660 len
= snprintf(buffer
, sizeof(buffer
), "%08lx\n",
2661 ((mm
->flags
& MMF_DUMP_FILTER_MASK
) >>
2662 MMF_DUMP_FILTER_SHIFT
));
2664 ret
= simple_read_from_buffer(buf
, count
, ppos
, buffer
, len
);
2667 put_task_struct(task
);
2672 static ssize_t
proc_coredump_filter_write(struct file
*file
,
2673 const char __user
*buf
,
2677 struct task_struct
*task
;
2678 struct mm_struct
*mm
;
2679 char buffer
[PROC_NUMBUF
], *end
;
2686 memset(buffer
, 0, sizeof(buffer
));
2687 if (count
> sizeof(buffer
) - 1)
2688 count
= sizeof(buffer
) - 1;
2689 if (copy_from_user(buffer
, buf
, count
))
2693 val
= (unsigned int)simple_strtoul(buffer
, &end
, 0);
2696 if (end
- buffer
== 0)
2700 task
= get_proc_task(file
->f_dentry
->d_inode
);
2705 mm
= get_task_mm(task
);
2709 for (i
= 0, mask
= 1; i
< MMF_DUMP_FILTER_BITS
; i
++, mask
<<= 1) {
2711 set_bit(i
+ MMF_DUMP_FILTER_SHIFT
, &mm
->flags
);
2713 clear_bit(i
+ MMF_DUMP_FILTER_SHIFT
, &mm
->flags
);
2718 put_task_struct(task
);
2723 static const struct file_operations proc_coredump_filter_operations
= {
2724 .read
= proc_coredump_filter_read
,
2725 .write
= proc_coredump_filter_write
,
2726 .llseek
= generic_file_llseek
,
2733 static int proc_self_readlink(struct dentry
*dentry
, char __user
*buffer
,
2736 struct pid_namespace
*ns
= dentry
->d_sb
->s_fs_info
;
2737 pid_t tgid
= task_tgid_nr_ns(current
, ns
);
2738 char tmp
[PROC_NUMBUF
];
2741 sprintf(tmp
, "%d", tgid
);
2742 return vfs_readlink(dentry
,buffer
,buflen
,tmp
);
2745 static void *proc_self_follow_link(struct dentry
*dentry
, struct nameidata
*nd
)
2747 struct pid_namespace
*ns
= dentry
->d_sb
->s_fs_info
;
2748 pid_t tgid
= task_tgid_nr_ns(current
, ns
);
2749 char *name
= ERR_PTR(-ENOENT
);
2753 name
= ERR_PTR(-ENOMEM
);
2755 sprintf(name
, "%d", tgid
);
2757 nd_set_link(nd
, name
);
2761 static void proc_self_put_link(struct dentry
*dentry
, struct nameidata
*nd
,
2764 char *s
= nd_get_link(nd
);
2769 static const struct inode_operations proc_self_inode_operations
= {
2770 .readlink
= proc_self_readlink
,
2771 .follow_link
= proc_self_follow_link
,
2772 .put_link
= proc_self_put_link
,
2778 * These are the directory entries in the root directory of /proc
2779 * that properly belong to the /proc filesystem, as they describe
2780 * describe something that is process related.
2782 static const struct pid_entry proc_base_stuff
[] = {
2783 NOD("self", S_IFLNK
|S_IRWXUGO
,
2784 &proc_self_inode_operations
, NULL
, {}),
2787 static struct dentry
*proc_base_instantiate(struct inode
*dir
,
2788 struct dentry
*dentry
, struct task_struct
*task
, const void *ptr
)
2790 const struct pid_entry
*p
= ptr
;
2791 struct inode
*inode
;
2792 struct proc_inode
*ei
;
2793 struct dentry
*error
;
2795 /* Allocate the inode */
2796 error
= ERR_PTR(-ENOMEM
);
2797 inode
= new_inode(dir
->i_sb
);
2801 /* Initialize the inode */
2803 inode
->i_ino
= get_next_ino();
2804 inode
->i_mtime
= inode
->i_atime
= inode
->i_ctime
= CURRENT_TIME
;
2807 * grab the reference to the task.
2809 ei
->pid
= get_task_pid(task
, PIDTYPE_PID
);
2813 inode
->i_mode
= p
->mode
;
2814 if (S_ISDIR(inode
->i_mode
))
2815 set_nlink(inode
, 2);
2816 if (S_ISLNK(inode
->i_mode
))
2819 inode
->i_op
= p
->iop
;
2821 inode
->i_fop
= p
->fop
;
2823 d_add(dentry
, inode
);
2832 static struct dentry
*proc_base_lookup(struct inode
*dir
, struct dentry
*dentry
)
2834 struct dentry
*error
;
2835 struct task_struct
*task
= get_proc_task(dir
);
2836 const struct pid_entry
*p
, *last
;
2838 error
= ERR_PTR(-ENOENT
);
2843 /* Lookup the directory entry */
2844 last
= &proc_base_stuff
[ARRAY_SIZE(proc_base_stuff
) - 1];
2845 for (p
= proc_base_stuff
; p
<= last
; p
++) {
2846 if (p
->len
!= dentry
->d_name
.len
)
2848 if (!memcmp(dentry
->d_name
.name
, p
->name
, p
->len
))
2854 error
= proc_base_instantiate(dir
, dentry
, task
, p
);
2857 put_task_struct(task
);
2862 static int proc_base_fill_cache(struct file
*filp
, void *dirent
,
2863 filldir_t filldir
, struct task_struct
*task
, const struct pid_entry
*p
)
2865 return proc_fill_cache(filp
, dirent
, filldir
, p
->name
, p
->len
,
2866 proc_base_instantiate
, task
, p
);
2869 #ifdef CONFIG_TASK_IO_ACCOUNTING
2870 static int do_io_accounting(struct task_struct
*task
, char *buffer
, int whole
)
2872 struct task_io_accounting acct
= task
->ioac
;
2873 unsigned long flags
;
2876 result
= mutex_lock_killable(&task
->signal
->cred_guard_mutex
);
2880 if (!ptrace_may_access(task
, PTRACE_MODE_READ
)) {
2885 if (whole
&& lock_task_sighand(task
, &flags
)) {
2886 struct task_struct
*t
= task
;
2888 task_io_accounting_add(&acct
, &task
->signal
->ioac
);
2889 while_each_thread(task
, t
)
2890 task_io_accounting_add(&acct
, &t
->ioac
);
2892 unlock_task_sighand(task
, &flags
);
2894 result
= sprintf(buffer
,
2899 "read_bytes: %llu\n"
2900 "write_bytes: %llu\n"
2901 "cancelled_write_bytes: %llu\n",
2902 (unsigned long long)acct
.rchar
,
2903 (unsigned long long)acct
.wchar
,
2904 (unsigned long long)acct
.syscr
,
2905 (unsigned long long)acct
.syscw
,
2906 (unsigned long long)acct
.read_bytes
,
2907 (unsigned long long)acct
.write_bytes
,
2908 (unsigned long long)acct
.cancelled_write_bytes
);
2910 mutex_unlock(&task
->signal
->cred_guard_mutex
);
2914 static int proc_tid_io_accounting(struct task_struct
*task
, char *buffer
)
2916 return do_io_accounting(task
, buffer
, 0);
2919 static int proc_tgid_io_accounting(struct task_struct
*task
, char *buffer
)
2921 return do_io_accounting(task
, buffer
, 1);
2923 #endif /* CONFIG_TASK_IO_ACCOUNTING */
2925 #ifdef CONFIG_USER_NS
2926 static int proc_id_map_open(struct inode
*inode
, struct file
*file
,
2927 struct seq_operations
*seq_ops
)
2929 struct user_namespace
*ns
= NULL
;
2930 struct task_struct
*task
;
2931 struct seq_file
*seq
;
2934 task
= get_proc_task(inode
);
2937 ns
= get_user_ns(task_cred_xxx(task
, user_ns
));
2939 put_task_struct(task
);
2944 ret
= seq_open(file
, seq_ops
);
2948 seq
= file
->private_data
;
2958 static int proc_id_map_release(struct inode
*inode
, struct file
*file
)
2960 struct seq_file
*seq
= file
->private_data
;
2961 struct user_namespace
*ns
= seq
->private;
2963 return seq_release(inode
, file
);
2966 static int proc_uid_map_open(struct inode
*inode
, struct file
*file
)
2968 return proc_id_map_open(inode
, file
, &proc_uid_seq_operations
);
2971 static int proc_gid_map_open(struct inode
*inode
, struct file
*file
)
2973 return proc_id_map_open(inode
, file
, &proc_gid_seq_operations
);
2976 static const struct file_operations proc_uid_map_operations
= {
2977 .open
= proc_uid_map_open
,
2978 .write
= proc_uid_map_write
,
2980 .llseek
= seq_lseek
,
2981 .release
= proc_id_map_release
,
2984 static const struct file_operations proc_gid_map_operations
= {
2985 .open
= proc_gid_map_open
,
2986 .write
= proc_gid_map_write
,
2988 .llseek
= seq_lseek
,
2989 .release
= proc_id_map_release
,
2991 #endif /* CONFIG_USER_NS */
2993 static int proc_pid_personality(struct seq_file
*m
, struct pid_namespace
*ns
,
2994 struct pid
*pid
, struct task_struct
*task
)
2996 int err
= lock_trace(task
);
2998 seq_printf(m
, "%08x\n", task
->personality
);
3007 static const struct file_operations proc_task_operations
;
3008 static const struct inode_operations proc_task_inode_operations
;
3010 static const struct pid_entry tgid_base_stuff
[] = {
3011 DIR("task", S_IRUGO
|S_IXUGO
, proc_task_inode_operations
, proc_task_operations
),
3012 DIR("fd", S_IRUSR
|S_IXUSR
, proc_fd_inode_operations
, proc_fd_operations
),
3013 #ifdef CONFIG_CHECKPOINT_RESTORE
3014 DIR("map_files", S_IRUSR
|S_IXUSR
, proc_map_files_inode_operations
, proc_map_files_operations
),
3016 DIR("fdinfo", S_IRUSR
|S_IXUSR
, proc_fdinfo_inode_operations
, proc_fdinfo_operations
),
3017 DIR("ns", S_IRUSR
|S_IXUGO
, proc_ns_dir_inode_operations
, proc_ns_dir_operations
),
3019 DIR("net", S_IRUGO
|S_IXUGO
, proc_net_inode_operations
, proc_net_operations
),
3021 REG("environ", S_IRUSR
, proc_environ_operations
),
3022 INF("auxv", S_IRUSR
, proc_pid_auxv
),
3023 ONE("status", S_IRUGO
, proc_pid_status
),
3024 ONE("personality", S_IRUGO
, proc_pid_personality
),
3025 INF("limits", S_IRUGO
, proc_pid_limits
),
3026 #ifdef CONFIG_SCHED_DEBUG
3027 REG("sched", S_IRUGO
|S_IWUSR
, proc_pid_sched_operations
),
3029 #ifdef CONFIG_SCHED_AUTOGROUP
3030 REG("autogroup", S_IRUGO
|S_IWUSR
, proc_pid_sched_autogroup_operations
),
3032 REG("comm", S_IRUGO
|S_IWUSR
, proc_pid_set_comm_operations
),
3033 #ifdef CONFIG_HAVE_ARCH_TRACEHOOK
3034 INF("syscall", S_IRUGO
, proc_pid_syscall
),
3036 INF("cmdline", S_IRUGO
, proc_pid_cmdline
),
3037 ONE("stat", S_IRUGO
, proc_tgid_stat
),
3038 ONE("statm", S_IRUGO
, proc_pid_statm
),
3039 REG("maps", S_IRUGO
, proc_pid_maps_operations
),
3041 REG("numa_maps", S_IRUGO
, proc_pid_numa_maps_operations
),
3043 REG("mem", S_IRUSR
|S_IWUSR
, proc_mem_operations
),
3044 LNK("cwd", proc_cwd_link
),
3045 LNK("root", proc_root_link
),
3046 LNK("exe", proc_exe_link
),
3047 REG("mounts", S_IRUGO
, proc_mounts_operations
),
3048 REG("mountinfo", S_IRUGO
, proc_mountinfo_operations
),
3049 REG("mountstats", S_IRUSR
, proc_mountstats_operations
),
3050 #ifdef CONFIG_PROC_PAGE_MONITOR
3051 REG("clear_refs", S_IWUSR
, proc_clear_refs_operations
),
3052 REG("smaps", S_IRUGO
, proc_pid_smaps_operations
),
3053 REG("pagemap", S_IRUGO
, proc_pagemap_operations
),
3055 #ifdef CONFIG_SECURITY
3056 DIR("attr", S_IRUGO
|S_IXUGO
, proc_attr_dir_inode_operations
, proc_attr_dir_operations
),
3058 #ifdef CONFIG_KALLSYMS
3059 INF("wchan", S_IRUGO
, proc_pid_wchan
),
3061 #ifdef CONFIG_STACKTRACE
3062 ONE("stack", S_IRUGO
, proc_pid_stack
),
3064 #ifdef CONFIG_SCHEDSTATS
3065 INF("schedstat", S_IRUGO
, proc_pid_schedstat
),
3067 #ifdef CONFIG_LATENCYTOP
3068 REG("latency", S_IRUGO
, proc_lstats_operations
),
3070 #ifdef CONFIG_PROC_PID_CPUSET
3071 REG("cpuset", S_IRUGO
, proc_cpuset_operations
),
3073 #ifdef CONFIG_CGROUPS
3074 REG("cgroup", S_IRUGO
, proc_cgroup_operations
),
3076 INF("oom_score", S_IRUGO
, proc_oom_score
),
3077 REG("oom_adj", S_IRUGO
|S_IWUSR
, proc_oom_adjust_operations
),
3078 REG("oom_score_adj", S_IRUGO
|S_IWUSR
, proc_oom_score_adj_operations
),
3079 #ifdef CONFIG_AUDITSYSCALL
3080 REG("loginuid", S_IWUSR
|S_IRUGO
, proc_loginuid_operations
),
3081 REG("sessionid", S_IRUGO
, proc_sessionid_operations
),
3083 #ifdef CONFIG_FAULT_INJECTION
3084 REG("make-it-fail", S_IRUGO
|S_IWUSR
, proc_fault_inject_operations
),
3086 #ifdef CONFIG_ELF_CORE
3087 REG("coredump_filter", S_IRUGO
|S_IWUSR
, proc_coredump_filter_operations
),
3089 #ifdef CONFIG_TASK_IO_ACCOUNTING
3090 INF("io", S_IRUSR
, proc_tgid_io_accounting
),
3092 #ifdef CONFIG_HARDWALL
3093 INF("hardwall", S_IRUGO
, proc_pid_hardwall
),
3095 #ifdef CONFIG_USER_NS
3096 REG("uid_map", S_IRUGO
|S_IWUSR
, proc_uid_map_operations
),
3097 REG("gid_map", S_IRUGO
|S_IWUSR
, proc_gid_map_operations
),
3101 static int proc_tgid_base_readdir(struct file
* filp
,
3102 void * dirent
, filldir_t filldir
)
3104 return proc_pident_readdir(filp
,dirent
,filldir
,
3105 tgid_base_stuff
,ARRAY_SIZE(tgid_base_stuff
));
3108 static const struct file_operations proc_tgid_base_operations
= {
3109 .read
= generic_read_dir
,
3110 .readdir
= proc_tgid_base_readdir
,
3111 .llseek
= default_llseek
,
3114 static struct dentry
*proc_tgid_base_lookup(struct inode
*dir
, struct dentry
*dentry
, struct nameidata
*nd
){
3115 return proc_pident_lookup(dir
, dentry
,
3116 tgid_base_stuff
, ARRAY_SIZE(tgid_base_stuff
));
3119 static const struct inode_operations proc_tgid_base_inode_operations
= {
3120 .lookup
= proc_tgid_base_lookup
,
3121 .getattr
= pid_getattr
,
3122 .setattr
= proc_setattr
,
3123 .permission
= proc_pid_permission
,
3126 static void proc_flush_task_mnt(struct vfsmount
*mnt
, pid_t pid
, pid_t tgid
)
3128 struct dentry
*dentry
, *leader
, *dir
;
3129 char buf
[PROC_NUMBUF
];
3133 name
.len
= snprintf(buf
, sizeof(buf
), "%d", pid
);
3134 dentry
= d_hash_and_lookup(mnt
->mnt_root
, &name
);
3136 shrink_dcache_parent(dentry
);
3142 name
.len
= snprintf(buf
, sizeof(buf
), "%d", tgid
);
3143 leader
= d_hash_and_lookup(mnt
->mnt_root
, &name
);
3148 name
.len
= strlen(name
.name
);
3149 dir
= d_hash_and_lookup(leader
, &name
);
3151 goto out_put_leader
;
3154 name
.len
= snprintf(buf
, sizeof(buf
), "%d", pid
);
3155 dentry
= d_hash_and_lookup(dir
, &name
);
3157 shrink_dcache_parent(dentry
);
3170 * proc_flush_task - Remove dcache entries for @task from the /proc dcache.
3171 * @task: task that should be flushed.
3173 * When flushing dentries from proc, one needs to flush them from global
3174 * proc (proc_mnt) and from all the namespaces' procs this task was seen
3175 * in. This call is supposed to do all of this job.
3177 * Looks in the dcache for
3179 * /proc/@tgid/task/@pid
3180 * if either directory is present flushes it and all of it'ts children
3183 * It is safe and reasonable to cache /proc entries for a task until
3184 * that task exits. After that they just clog up the dcache with
3185 * useless entries, possibly causing useful dcache entries to be
3186 * flushed instead. This routine is proved to flush those useless
3187 * dcache entries at process exit time.
3189 * NOTE: This routine is just an optimization so it does not guarantee
3190 * that no dcache entries will exist at process exit time it
3191 * just makes it very unlikely that any will persist.
3194 void proc_flush_task(struct task_struct
*task
)
3197 struct pid
*pid
, *tgid
;
3200 pid
= task_pid(task
);
3201 tgid
= task_tgid(task
);
3203 for (i
= 0; i
<= pid
->level
; i
++) {
3204 upid
= &pid
->numbers
[i
];
3205 proc_flush_task_mnt(upid
->ns
->proc_mnt
, upid
->nr
,
3206 tgid
->numbers
[i
].nr
);
3209 upid
= &pid
->numbers
[pid
->level
];
3211 pid_ns_release_proc(upid
->ns
);
3214 static struct dentry
*proc_pid_instantiate(struct inode
*dir
,
3215 struct dentry
* dentry
,
3216 struct task_struct
*task
, const void *ptr
)
3218 struct dentry
*error
= ERR_PTR(-ENOENT
);
3219 struct inode
*inode
;
3221 inode
= proc_pid_make_inode(dir
->i_sb
, task
);
3225 inode
->i_mode
= S_IFDIR
|S_IRUGO
|S_IXUGO
;
3226 inode
->i_op
= &proc_tgid_base_inode_operations
;
3227 inode
->i_fop
= &proc_tgid_base_operations
;
3228 inode
->i_flags
|=S_IMMUTABLE
;
3230 set_nlink(inode
, 2 + pid_entry_count_dirs(tgid_base_stuff
,
3231 ARRAY_SIZE(tgid_base_stuff
)));
3233 d_set_d_op(dentry
, &pid_dentry_operations
);
3235 d_add(dentry
, inode
);
3236 /* Close the race of the process dying before we return the dentry */
3237 if (pid_revalidate(dentry
, NULL
))
3243 struct dentry
*proc_pid_lookup(struct inode
*dir
, struct dentry
* dentry
, struct nameidata
*nd
)
3245 struct dentry
*result
;
3246 struct task_struct
*task
;
3248 struct pid_namespace
*ns
;
3250 result
= proc_base_lookup(dir
, dentry
);
3251 if (!IS_ERR(result
) || PTR_ERR(result
) != -ENOENT
)
3254 tgid
= name_to_int(dentry
);
3258 ns
= dentry
->d_sb
->s_fs_info
;
3260 task
= find_task_by_pid_ns(tgid
, ns
);
3262 get_task_struct(task
);
3267 result
= proc_pid_instantiate(dir
, dentry
, task
, NULL
);
3268 put_task_struct(task
);
3274 * Find the first task with tgid >= tgid
3279 struct task_struct
*task
;
3281 static struct tgid_iter
next_tgid(struct pid_namespace
*ns
, struct tgid_iter iter
)
3286 put_task_struct(iter
.task
);
3290 pid
= find_ge_pid(iter
.tgid
, ns
);
3292 iter
.tgid
= pid_nr_ns(pid
, ns
);
3293 iter
.task
= pid_task(pid
, PIDTYPE_PID
);
3294 /* What we to know is if the pid we have find is the
3295 * pid of a thread_group_leader. Testing for task
3296 * being a thread_group_leader is the obvious thing
3297 * todo but there is a window when it fails, due to
3298 * the pid transfer logic in de_thread.
3300 * So we perform the straight forward test of seeing
3301 * if the pid we have found is the pid of a thread
3302 * group leader, and don't worry if the task we have
3303 * found doesn't happen to be a thread group leader.
3304 * As we don't care in the case of readdir.
3306 if (!iter
.task
|| !has_group_leader_pid(iter
.task
)) {
3310 get_task_struct(iter
.task
);
3316 #define TGID_OFFSET (FIRST_PROCESS_ENTRY + ARRAY_SIZE(proc_base_stuff))
3318 static int proc_pid_fill_cache(struct file
*filp
, void *dirent
, filldir_t filldir
,
3319 struct tgid_iter iter
)
3321 char name
[PROC_NUMBUF
];
3322 int len
= snprintf(name
, sizeof(name
), "%d", iter
.tgid
);
3323 return proc_fill_cache(filp
, dirent
, filldir
, name
, len
,
3324 proc_pid_instantiate
, iter
.task
, NULL
);
3327 static int fake_filldir(void *buf
, const char *name
, int namelen
,
3328 loff_t offset
, u64 ino
, unsigned d_type
)
3333 /* for the /proc/ directory itself, after non-process stuff has been done */
3334 int proc_pid_readdir(struct file
* filp
, void * dirent
, filldir_t filldir
)
3337 struct task_struct
*reaper
;
3338 struct tgid_iter iter
;
3339 struct pid_namespace
*ns
;
3340 filldir_t __filldir
;
3342 if (filp
->f_pos
>= PID_MAX_LIMIT
+ TGID_OFFSET
)
3344 nr
= filp
->f_pos
- FIRST_PROCESS_ENTRY
;
3346 reaper
= get_proc_task(filp
->f_path
.dentry
->d_inode
);
3350 for (; nr
< ARRAY_SIZE(proc_base_stuff
); filp
->f_pos
++, nr
++) {
3351 const struct pid_entry
*p
= &proc_base_stuff
[nr
];
3352 if (proc_base_fill_cache(filp
, dirent
, filldir
, reaper
, p
) < 0)
3356 ns
= filp
->f_dentry
->d_sb
->s_fs_info
;
3358 iter
.tgid
= filp
->f_pos
- TGID_OFFSET
;
3359 for (iter
= next_tgid(ns
, iter
);
3361 iter
.tgid
+= 1, iter
= next_tgid(ns
, iter
)) {
3362 if (has_pid_permissions(ns
, iter
.task
, 2))
3363 __filldir
= filldir
;
3365 __filldir
= fake_filldir
;
3367 filp
->f_pos
= iter
.tgid
+ TGID_OFFSET
;
3368 if (proc_pid_fill_cache(filp
, dirent
, __filldir
, iter
) < 0) {
3369 put_task_struct(iter
.task
);
3373 filp
->f_pos
= PID_MAX_LIMIT
+ TGID_OFFSET
;
3375 put_task_struct(reaper
);
3383 static const struct pid_entry tid_base_stuff
[] = {
3384 DIR("fd", S_IRUSR
|S_IXUSR
, proc_fd_inode_operations
, proc_fd_operations
),
3385 DIR("fdinfo", S_IRUSR
|S_IXUSR
, proc_fdinfo_inode_operations
, proc_fdinfo_operations
),
3386 DIR("ns", S_IRUSR
|S_IXUGO
, proc_ns_dir_inode_operations
, proc_ns_dir_operations
),
3387 REG("environ", S_IRUSR
, proc_environ_operations
),
3388 INF("auxv", S_IRUSR
, proc_pid_auxv
),
3389 ONE("status", S_IRUGO
, proc_pid_status
),
3390 ONE("personality", S_IRUGO
, proc_pid_personality
),
3391 INF("limits", S_IRUGO
, proc_pid_limits
),
3392 #ifdef CONFIG_SCHED_DEBUG
3393 REG("sched", S_IRUGO
|S_IWUSR
, proc_pid_sched_operations
),
3395 REG("comm", S_IRUGO
|S_IWUSR
, proc_pid_set_comm_operations
),
3396 #ifdef CONFIG_HAVE_ARCH_TRACEHOOK
3397 INF("syscall", S_IRUGO
, proc_pid_syscall
),
3399 INF("cmdline", S_IRUGO
, proc_pid_cmdline
),
3400 ONE("stat", S_IRUGO
, proc_tid_stat
),
3401 ONE("statm", S_IRUGO
, proc_pid_statm
),
3402 REG("maps", S_IRUGO
, proc_tid_maps_operations
),
3404 REG("numa_maps", S_IRUGO
, proc_tid_numa_maps_operations
),
3406 REG("mem", S_IRUSR
|S_IWUSR
, proc_mem_operations
),
3407 LNK("cwd", proc_cwd_link
),
3408 LNK("root", proc_root_link
),
3409 LNK("exe", proc_exe_link
),
3410 REG("mounts", S_IRUGO
, proc_mounts_operations
),
3411 REG("mountinfo", S_IRUGO
, proc_mountinfo_operations
),
3412 #ifdef CONFIG_PROC_PAGE_MONITOR
3413 REG("clear_refs", S_IWUSR
, proc_clear_refs_operations
),
3414 REG("smaps", S_IRUGO
, proc_tid_smaps_operations
),
3415 REG("pagemap", S_IRUGO
, proc_pagemap_operations
),
3417 #ifdef CONFIG_SECURITY
3418 DIR("attr", S_IRUGO
|S_IXUGO
, proc_attr_dir_inode_operations
, proc_attr_dir_operations
),
3420 #ifdef CONFIG_KALLSYMS
3421 INF("wchan", S_IRUGO
, proc_pid_wchan
),
3423 #ifdef CONFIG_STACKTRACE
3424 ONE("stack", S_IRUGO
, proc_pid_stack
),
3426 #ifdef CONFIG_SCHEDSTATS
3427 INF("schedstat", S_IRUGO
, proc_pid_schedstat
),
3429 #ifdef CONFIG_LATENCYTOP
3430 REG("latency", S_IRUGO
, proc_lstats_operations
),
3432 #ifdef CONFIG_PROC_PID_CPUSET
3433 REG("cpuset", S_IRUGO
, proc_cpuset_operations
),
3435 #ifdef CONFIG_CGROUPS
3436 REG("cgroup", S_IRUGO
, proc_cgroup_operations
),
3438 INF("oom_score", S_IRUGO
, proc_oom_score
),
3439 REG("oom_adj", S_IRUGO
|S_IWUSR
, proc_oom_adjust_operations
),
3440 REG("oom_score_adj", S_IRUGO
|S_IWUSR
, proc_oom_score_adj_operations
),
3441 #ifdef CONFIG_AUDITSYSCALL
3442 REG("loginuid", S_IWUSR
|S_IRUGO
, proc_loginuid_operations
),
3443 REG("sessionid", S_IRUGO
, proc_sessionid_operations
),
3445 #ifdef CONFIG_FAULT_INJECTION
3446 REG("make-it-fail", S_IRUGO
|S_IWUSR
, proc_fault_inject_operations
),
3448 #ifdef CONFIG_TASK_IO_ACCOUNTING
3449 INF("io", S_IRUSR
, proc_tid_io_accounting
),
3451 #ifdef CONFIG_HARDWALL
3452 INF("hardwall", S_IRUGO
, proc_pid_hardwall
),
3454 #ifdef CONFIG_USER_NS
3455 REG("uid_map", S_IRUGO
|S_IWUSR
, proc_uid_map_operations
),
3456 REG("gid_map", S_IRUGO
|S_IWUSR
, proc_gid_map_operations
),
3460 static int proc_tid_base_readdir(struct file
* filp
,
3461 void * dirent
, filldir_t filldir
)
3463 return proc_pident_readdir(filp
,dirent
,filldir
,
3464 tid_base_stuff
,ARRAY_SIZE(tid_base_stuff
));
3467 static struct dentry
*proc_tid_base_lookup(struct inode
*dir
, struct dentry
*dentry
, struct nameidata
*nd
){
3468 return proc_pident_lookup(dir
, dentry
,
3469 tid_base_stuff
, ARRAY_SIZE(tid_base_stuff
));
3472 static const struct file_operations proc_tid_base_operations
= {
3473 .read
= generic_read_dir
,
3474 .readdir
= proc_tid_base_readdir
,
3475 .llseek
= default_llseek
,
3478 static const struct inode_operations proc_tid_base_inode_operations
= {
3479 .lookup
= proc_tid_base_lookup
,
3480 .getattr
= pid_getattr
,
3481 .setattr
= proc_setattr
,
3484 static struct dentry
*proc_task_instantiate(struct inode
*dir
,
3485 struct dentry
*dentry
, struct task_struct
*task
, const void *ptr
)
3487 struct dentry
*error
= ERR_PTR(-ENOENT
);
3488 struct inode
*inode
;
3489 inode
= proc_pid_make_inode(dir
->i_sb
, task
);
3493 inode
->i_mode
= S_IFDIR
|S_IRUGO
|S_IXUGO
;
3494 inode
->i_op
= &proc_tid_base_inode_operations
;
3495 inode
->i_fop
= &proc_tid_base_operations
;
3496 inode
->i_flags
|=S_IMMUTABLE
;
3498 set_nlink(inode
, 2 + pid_entry_count_dirs(tid_base_stuff
,
3499 ARRAY_SIZE(tid_base_stuff
)));
3501 d_set_d_op(dentry
, &pid_dentry_operations
);
3503 d_add(dentry
, inode
);
3504 /* Close the race of the process dying before we return the dentry */
3505 if (pid_revalidate(dentry
, NULL
))
3511 static struct dentry
*proc_task_lookup(struct inode
*dir
, struct dentry
* dentry
, struct nameidata
*nd
)
3513 struct dentry
*result
= ERR_PTR(-ENOENT
);
3514 struct task_struct
*task
;
3515 struct task_struct
*leader
= get_proc_task(dir
);
3517 struct pid_namespace
*ns
;
3522 tid
= name_to_int(dentry
);
3526 ns
= dentry
->d_sb
->s_fs_info
;
3528 task
= find_task_by_pid_ns(tid
, ns
);
3530 get_task_struct(task
);
3534 if (!same_thread_group(leader
, task
))
3537 result
= proc_task_instantiate(dir
, dentry
, task
, NULL
);
3539 put_task_struct(task
);
3541 put_task_struct(leader
);
3547 * Find the first tid of a thread group to return to user space.
3549 * Usually this is just the thread group leader, but if the users
3550 * buffer was too small or there was a seek into the middle of the
3551 * directory we have more work todo.
3553 * In the case of a short read we start with find_task_by_pid.
3555 * In the case of a seek we start with the leader and walk nr
3558 static struct task_struct
*first_tid(struct task_struct
*leader
,
3559 int tid
, int nr
, struct pid_namespace
*ns
)
3561 struct task_struct
*pos
;
3564 /* Attempt to start with the pid of a thread */
3565 if (tid
&& (nr
> 0)) {
3566 pos
= find_task_by_pid_ns(tid
, ns
);
3567 if (pos
&& (pos
->group_leader
== leader
))
3571 /* If nr exceeds the number of threads there is nothing todo */
3573 if (nr
&& nr
>= get_nr_threads(leader
))
3576 /* If we haven't found our starting place yet start
3577 * with the leader and walk nr threads forward.
3579 for (pos
= leader
; nr
> 0; --nr
) {
3580 pos
= next_thread(pos
);
3581 if (pos
== leader
) {
3587 get_task_struct(pos
);
3594 * Find the next thread in the thread list.
3595 * Return NULL if there is an error or no next thread.
3597 * The reference to the input task_struct is released.
3599 static struct task_struct
*next_tid(struct task_struct
*start
)
3601 struct task_struct
*pos
= NULL
;
3603 if (pid_alive(start
)) {
3604 pos
= next_thread(start
);
3605 if (thread_group_leader(pos
))
3608 get_task_struct(pos
);
3611 put_task_struct(start
);
3615 static int proc_task_fill_cache(struct file
*filp
, void *dirent
, filldir_t filldir
,
3616 struct task_struct
*task
, int tid
)
3618 char name
[PROC_NUMBUF
];
3619 int len
= snprintf(name
, sizeof(name
), "%d", tid
);
3620 return proc_fill_cache(filp
, dirent
, filldir
, name
, len
,
3621 proc_task_instantiate
, task
, NULL
);
3624 /* for the /proc/TGID/task/ directories */
3625 static int proc_task_readdir(struct file
* filp
, void * dirent
, filldir_t filldir
)
3627 struct dentry
*dentry
= filp
->f_path
.dentry
;
3628 struct inode
*inode
= dentry
->d_inode
;
3629 struct task_struct
*leader
= NULL
;
3630 struct task_struct
*task
;
3631 int retval
= -ENOENT
;
3634 struct pid_namespace
*ns
;
3636 task
= get_proc_task(inode
);
3640 if (pid_alive(task
)) {
3641 leader
= task
->group_leader
;
3642 get_task_struct(leader
);
3645 put_task_struct(task
);
3650 switch ((unsigned long)filp
->f_pos
) {
3653 if (filldir(dirent
, ".", 1, filp
->f_pos
, ino
, DT_DIR
) < 0)
3658 ino
= parent_ino(dentry
);
3659 if (filldir(dirent
, "..", 2, filp
->f_pos
, ino
, DT_DIR
) < 0)
3665 /* f_version caches the tgid value that the last readdir call couldn't
3666 * return. lseek aka telldir automagically resets f_version to 0.
3668 ns
= filp
->f_dentry
->d_sb
->s_fs_info
;
3669 tid
= (int)filp
->f_version
;
3670 filp
->f_version
= 0;
3671 for (task
= first_tid(leader
, tid
, filp
->f_pos
- 2, ns
);
3673 task
= next_tid(task
), filp
->f_pos
++) {
3674 tid
= task_pid_nr_ns(task
, ns
);
3675 if (proc_task_fill_cache(filp
, dirent
, filldir
, task
, tid
) < 0) {
3676 /* returning this tgid failed, save it as the first
3677 * pid for the next readir call */
3678 filp
->f_version
= (u64
)tid
;
3679 put_task_struct(task
);
3684 put_task_struct(leader
);
3689 static int proc_task_getattr(struct vfsmount
*mnt
, struct dentry
*dentry
, struct kstat
*stat
)
3691 struct inode
*inode
= dentry
->d_inode
;
3692 struct task_struct
*p
= get_proc_task(inode
);
3693 generic_fillattr(inode
, stat
);
3696 stat
->nlink
+= get_nr_threads(p
);
3703 static const struct inode_operations proc_task_inode_operations
= {
3704 .lookup
= proc_task_lookup
,
3705 .getattr
= proc_task_getattr
,
3706 .setattr
= proc_setattr
,
3707 .permission
= proc_pid_permission
,
3710 static const struct file_operations proc_task_operations
= {
3711 .read
= generic_read_dir
,
3712 .readdir
= proc_task_readdir
,
3713 .llseek
= default_llseek
,