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 file
->private_data
= mm
;
703 static int mem_open(struct inode
*inode
, struct file
*file
)
705 int ret
= __mem_open(inode
, file
, PTRACE_MODE_ATTACH
);
707 /* OK to pass negative loff_t, we can catch out-of-range */
708 file
->f_mode
|= FMODE_UNSIGNED_OFFSET
;
713 static ssize_t
mem_rw(struct file
*file
, char __user
*buf
,
714 size_t count
, loff_t
*ppos
, int write
)
716 struct mm_struct
*mm
= file
->private_data
;
717 unsigned long addr
= *ppos
;
724 page
= (char *)__get_free_page(GFP_TEMPORARY
);
729 if (!atomic_inc_not_zero(&mm
->mm_users
))
733 int this_len
= min_t(int, count
, PAGE_SIZE
);
735 if (write
&& copy_from_user(page
, buf
, this_len
)) {
740 this_len
= access_remote_vm(mm
, addr
, page
, this_len
, write
);
747 if (!write
&& copy_to_user(buf
, page
, this_len
)) {
761 free_page((unsigned long) page
);
765 static ssize_t
mem_read(struct file
*file
, char __user
*buf
,
766 size_t count
, loff_t
*ppos
)
768 return mem_rw(file
, buf
, count
, ppos
, 0);
771 static ssize_t
mem_write(struct file
*file
, const char __user
*buf
,
772 size_t count
, loff_t
*ppos
)
774 return mem_rw(file
, (char __user
*)buf
, count
, ppos
, 1);
777 loff_t
mem_lseek(struct file
*file
, loff_t offset
, int orig
)
781 file
->f_pos
= offset
;
784 file
->f_pos
+= offset
;
789 force_successful_syscall_return();
793 static int mem_release(struct inode
*inode
, struct file
*file
)
795 struct mm_struct
*mm
= file
->private_data
;
801 static const struct file_operations proc_mem_operations
= {
806 .release
= mem_release
,
809 static int environ_open(struct inode
*inode
, struct file
*file
)
811 return __mem_open(inode
, file
, PTRACE_MODE_READ
);
814 static ssize_t
environ_read(struct file
*file
, char __user
*buf
,
815 size_t count
, loff_t
*ppos
)
818 unsigned long src
= *ppos
;
820 struct mm_struct
*mm
= file
->private_data
;
825 page
= (char *)__get_free_page(GFP_TEMPORARY
);
830 if (!atomic_inc_not_zero(&mm
->mm_users
))
833 size_t this_len
, max_len
;
836 if (src
>= (mm
->env_end
- mm
->env_start
))
839 this_len
= mm
->env_end
- (mm
->env_start
+ src
);
841 max_len
= min_t(size_t, PAGE_SIZE
, count
);
842 this_len
= min(max_len
, this_len
);
844 retval
= access_remote_vm(mm
, (mm
->env_start
+ src
),
852 if (copy_to_user(buf
, page
, retval
)) {
866 free_page((unsigned long) page
);
870 static const struct file_operations proc_environ_operations
= {
871 .open
= environ_open
,
872 .read
= environ_read
,
873 .llseek
= generic_file_llseek
,
874 .release
= mem_release
,
877 static ssize_t
oom_adjust_read(struct file
*file
, char __user
*buf
,
878 size_t count
, loff_t
*ppos
)
880 struct task_struct
*task
= get_proc_task(file
->f_path
.dentry
->d_inode
);
881 char buffer
[PROC_NUMBUF
];
883 int oom_adjust
= OOM_DISABLE
;
889 if (lock_task_sighand(task
, &flags
)) {
890 oom_adjust
= task
->signal
->oom_adj
;
891 unlock_task_sighand(task
, &flags
);
894 put_task_struct(task
);
896 len
= snprintf(buffer
, sizeof(buffer
), "%i\n", oom_adjust
);
898 return simple_read_from_buffer(buf
, count
, ppos
, buffer
, len
);
901 static ssize_t
oom_adjust_write(struct file
*file
, const char __user
*buf
,
902 size_t count
, loff_t
*ppos
)
904 struct task_struct
*task
;
905 char buffer
[PROC_NUMBUF
];
910 memset(buffer
, 0, sizeof(buffer
));
911 if (count
> sizeof(buffer
) - 1)
912 count
= sizeof(buffer
) - 1;
913 if (copy_from_user(buffer
, buf
, count
)) {
918 err
= kstrtoint(strstrip(buffer
), 0, &oom_adjust
);
921 if ((oom_adjust
< OOM_ADJUST_MIN
|| oom_adjust
> OOM_ADJUST_MAX
) &&
922 oom_adjust
!= OOM_DISABLE
) {
927 task
= get_proc_task(file
->f_path
.dentry
->d_inode
);
939 if (!lock_task_sighand(task
, &flags
)) {
944 if (oom_adjust
< task
->signal
->oom_adj
&& !capable(CAP_SYS_RESOURCE
)) {
950 * Warn that /proc/pid/oom_adj is deprecated, see
951 * Documentation/feature-removal-schedule.txt.
953 printk_once(KERN_WARNING
"%s (%d): /proc/%d/oom_adj is deprecated, please use /proc/%d/oom_score_adj instead.\n",
954 current
->comm
, task_pid_nr(current
), task_pid_nr(task
),
956 task
->signal
->oom_adj
= oom_adjust
;
958 * Scale /proc/pid/oom_score_adj appropriately ensuring that a maximum
959 * value is always attainable.
961 if (task
->signal
->oom_adj
== OOM_ADJUST_MAX
)
962 task
->signal
->oom_score_adj
= OOM_SCORE_ADJ_MAX
;
964 task
->signal
->oom_score_adj
= (oom_adjust
* OOM_SCORE_ADJ_MAX
) /
966 trace_oom_score_adj_update(task
);
968 unlock_task_sighand(task
, &flags
);
971 put_task_struct(task
);
973 return err
< 0 ? err
: count
;
976 static const struct file_operations proc_oom_adjust_operations
= {
977 .read
= oom_adjust_read
,
978 .write
= oom_adjust_write
,
979 .llseek
= generic_file_llseek
,
982 static ssize_t
oom_score_adj_read(struct file
*file
, char __user
*buf
,
983 size_t count
, loff_t
*ppos
)
985 struct task_struct
*task
= get_proc_task(file
->f_path
.dentry
->d_inode
);
986 char buffer
[PROC_NUMBUF
];
987 int oom_score_adj
= OOM_SCORE_ADJ_MIN
;
993 if (lock_task_sighand(task
, &flags
)) {
994 oom_score_adj
= task
->signal
->oom_score_adj
;
995 unlock_task_sighand(task
, &flags
);
997 put_task_struct(task
);
998 len
= snprintf(buffer
, sizeof(buffer
), "%d\n", oom_score_adj
);
999 return simple_read_from_buffer(buf
, count
, ppos
, buffer
, len
);
1002 static ssize_t
oom_score_adj_write(struct file
*file
, const char __user
*buf
,
1003 size_t count
, loff_t
*ppos
)
1005 struct task_struct
*task
;
1006 char buffer
[PROC_NUMBUF
];
1007 unsigned long flags
;
1011 memset(buffer
, 0, sizeof(buffer
));
1012 if (count
> sizeof(buffer
) - 1)
1013 count
= sizeof(buffer
) - 1;
1014 if (copy_from_user(buffer
, buf
, count
)) {
1019 err
= kstrtoint(strstrip(buffer
), 0, &oom_score_adj
);
1022 if (oom_score_adj
< OOM_SCORE_ADJ_MIN
||
1023 oom_score_adj
> OOM_SCORE_ADJ_MAX
) {
1028 task
= get_proc_task(file
->f_path
.dentry
->d_inode
);
1040 if (!lock_task_sighand(task
, &flags
)) {
1045 if (oom_score_adj
< task
->signal
->oom_score_adj_min
&&
1046 !capable(CAP_SYS_RESOURCE
)) {
1051 task
->signal
->oom_score_adj
= oom_score_adj
;
1052 if (has_capability_noaudit(current
, CAP_SYS_RESOURCE
))
1053 task
->signal
->oom_score_adj_min
= oom_score_adj
;
1054 trace_oom_score_adj_update(task
);
1056 * Scale /proc/pid/oom_adj appropriately ensuring that OOM_DISABLE is
1057 * always attainable.
1059 if (task
->signal
->oom_score_adj
== OOM_SCORE_ADJ_MIN
)
1060 task
->signal
->oom_adj
= OOM_DISABLE
;
1062 task
->signal
->oom_adj
= (oom_score_adj
* OOM_ADJUST_MAX
) /
1065 unlock_task_sighand(task
, &flags
);
1068 put_task_struct(task
);
1070 return err
< 0 ? err
: count
;
1073 static const struct file_operations proc_oom_score_adj_operations
= {
1074 .read
= oom_score_adj_read
,
1075 .write
= oom_score_adj_write
,
1076 .llseek
= default_llseek
,
1079 #ifdef CONFIG_AUDITSYSCALL
1080 #define TMPBUFLEN 21
1081 static ssize_t
proc_loginuid_read(struct file
* file
, char __user
* buf
,
1082 size_t count
, loff_t
*ppos
)
1084 struct inode
* inode
= file
->f_path
.dentry
->d_inode
;
1085 struct task_struct
*task
= get_proc_task(inode
);
1087 char tmpbuf
[TMPBUFLEN
];
1091 length
= scnprintf(tmpbuf
, TMPBUFLEN
, "%u",
1092 from_kuid(file
->f_cred
->user_ns
,
1093 audit_get_loginuid(task
)));
1094 put_task_struct(task
);
1095 return simple_read_from_buffer(buf
, count
, ppos
, tmpbuf
, length
);
1098 static ssize_t
proc_loginuid_write(struct file
* file
, const char __user
* buf
,
1099 size_t count
, loff_t
*ppos
)
1101 struct inode
* inode
= file
->f_path
.dentry
->d_inode
;
1108 if (current
!= pid_task(proc_pid(inode
), PIDTYPE_PID
)) {
1114 if (count
>= PAGE_SIZE
)
1115 count
= PAGE_SIZE
- 1;
1118 /* No partial writes. */
1121 page
= (char*)__get_free_page(GFP_TEMPORARY
);
1125 if (copy_from_user(page
, buf
, count
))
1129 loginuid
= simple_strtoul(page
, &tmp
, 10);
1135 kloginuid
= make_kuid(file
->f_cred
->user_ns
, loginuid
);
1136 if (!uid_valid(kloginuid
)) {
1141 length
= audit_set_loginuid(kloginuid
);
1142 if (likely(length
== 0))
1146 free_page((unsigned long) page
);
1150 static const struct file_operations proc_loginuid_operations
= {
1151 .read
= proc_loginuid_read
,
1152 .write
= proc_loginuid_write
,
1153 .llseek
= generic_file_llseek
,
1156 static ssize_t
proc_sessionid_read(struct file
* file
, char __user
* buf
,
1157 size_t count
, loff_t
*ppos
)
1159 struct inode
* inode
= file
->f_path
.dentry
->d_inode
;
1160 struct task_struct
*task
= get_proc_task(inode
);
1162 char tmpbuf
[TMPBUFLEN
];
1166 length
= scnprintf(tmpbuf
, TMPBUFLEN
, "%u",
1167 audit_get_sessionid(task
));
1168 put_task_struct(task
);
1169 return simple_read_from_buffer(buf
, count
, ppos
, tmpbuf
, length
);
1172 static const struct file_operations proc_sessionid_operations
= {
1173 .read
= proc_sessionid_read
,
1174 .llseek
= generic_file_llseek
,
1178 #ifdef CONFIG_FAULT_INJECTION
1179 static ssize_t
proc_fault_inject_read(struct file
* file
, char __user
* buf
,
1180 size_t count
, loff_t
*ppos
)
1182 struct task_struct
*task
= get_proc_task(file
->f_dentry
->d_inode
);
1183 char buffer
[PROC_NUMBUF
];
1189 make_it_fail
= task
->make_it_fail
;
1190 put_task_struct(task
);
1192 len
= snprintf(buffer
, sizeof(buffer
), "%i\n", make_it_fail
);
1194 return simple_read_from_buffer(buf
, count
, ppos
, buffer
, len
);
1197 static ssize_t
proc_fault_inject_write(struct file
* file
,
1198 const char __user
* buf
, size_t count
, loff_t
*ppos
)
1200 struct task_struct
*task
;
1201 char buffer
[PROC_NUMBUF
], *end
;
1204 if (!capable(CAP_SYS_RESOURCE
))
1206 memset(buffer
, 0, sizeof(buffer
));
1207 if (count
> sizeof(buffer
) - 1)
1208 count
= sizeof(buffer
) - 1;
1209 if (copy_from_user(buffer
, buf
, count
))
1211 make_it_fail
= simple_strtol(strstrip(buffer
), &end
, 0);
1214 task
= get_proc_task(file
->f_dentry
->d_inode
);
1217 task
->make_it_fail
= make_it_fail
;
1218 put_task_struct(task
);
1223 static const struct file_operations proc_fault_inject_operations
= {
1224 .read
= proc_fault_inject_read
,
1225 .write
= proc_fault_inject_write
,
1226 .llseek
= generic_file_llseek
,
1231 #ifdef CONFIG_SCHED_DEBUG
1233 * Print out various scheduling related per-task fields:
1235 static int sched_show(struct seq_file
*m
, void *v
)
1237 struct inode
*inode
= m
->private;
1238 struct task_struct
*p
;
1240 p
= get_proc_task(inode
);
1243 proc_sched_show_task(p
, m
);
1251 sched_write(struct file
*file
, const char __user
*buf
,
1252 size_t count
, loff_t
*offset
)
1254 struct inode
*inode
= file
->f_path
.dentry
->d_inode
;
1255 struct task_struct
*p
;
1257 p
= get_proc_task(inode
);
1260 proc_sched_set_task(p
);
1267 static int sched_open(struct inode
*inode
, struct file
*filp
)
1269 return single_open(filp
, sched_show
, inode
);
1272 static const struct file_operations proc_pid_sched_operations
= {
1275 .write
= sched_write
,
1276 .llseek
= seq_lseek
,
1277 .release
= single_release
,
1282 #ifdef CONFIG_SCHED_AUTOGROUP
1284 * Print out autogroup related information:
1286 static int sched_autogroup_show(struct seq_file
*m
, void *v
)
1288 struct inode
*inode
= m
->private;
1289 struct task_struct
*p
;
1291 p
= get_proc_task(inode
);
1294 proc_sched_autogroup_show_task(p
, m
);
1302 sched_autogroup_write(struct file
*file
, const char __user
*buf
,
1303 size_t count
, loff_t
*offset
)
1305 struct inode
*inode
= file
->f_path
.dentry
->d_inode
;
1306 struct task_struct
*p
;
1307 char buffer
[PROC_NUMBUF
];
1311 memset(buffer
, 0, sizeof(buffer
));
1312 if (count
> sizeof(buffer
) - 1)
1313 count
= sizeof(buffer
) - 1;
1314 if (copy_from_user(buffer
, buf
, count
))
1317 err
= kstrtoint(strstrip(buffer
), 0, &nice
);
1321 p
= get_proc_task(inode
);
1325 err
= proc_sched_autogroup_set_nice(p
, nice
);
1334 static int sched_autogroup_open(struct inode
*inode
, struct file
*filp
)
1338 ret
= single_open(filp
, sched_autogroup_show
, NULL
);
1340 struct seq_file
*m
= filp
->private_data
;
1347 static const struct file_operations proc_pid_sched_autogroup_operations
= {
1348 .open
= sched_autogroup_open
,
1350 .write
= sched_autogroup_write
,
1351 .llseek
= seq_lseek
,
1352 .release
= single_release
,
1355 #endif /* CONFIG_SCHED_AUTOGROUP */
1357 static ssize_t
comm_write(struct file
*file
, const char __user
*buf
,
1358 size_t count
, loff_t
*offset
)
1360 struct inode
*inode
= file
->f_path
.dentry
->d_inode
;
1361 struct task_struct
*p
;
1362 char buffer
[TASK_COMM_LEN
];
1364 memset(buffer
, 0, sizeof(buffer
));
1365 if (count
> sizeof(buffer
) - 1)
1366 count
= sizeof(buffer
) - 1;
1367 if (copy_from_user(buffer
, buf
, count
))
1370 p
= get_proc_task(inode
);
1374 if (same_thread_group(current
, p
))
1375 set_task_comm(p
, buffer
);
1384 static int comm_show(struct seq_file
*m
, void *v
)
1386 struct inode
*inode
= m
->private;
1387 struct task_struct
*p
;
1389 p
= get_proc_task(inode
);
1394 seq_printf(m
, "%s\n", p
->comm
);
1402 static int comm_open(struct inode
*inode
, struct file
*filp
)
1404 return single_open(filp
, comm_show
, inode
);
1407 static const struct file_operations proc_pid_set_comm_operations
= {
1410 .write
= comm_write
,
1411 .llseek
= seq_lseek
,
1412 .release
= single_release
,
1415 static int proc_exe_link(struct dentry
*dentry
, struct path
*exe_path
)
1417 struct task_struct
*task
;
1418 struct mm_struct
*mm
;
1419 struct file
*exe_file
;
1421 task
= get_proc_task(dentry
->d_inode
);
1424 mm
= get_task_mm(task
);
1425 put_task_struct(task
);
1428 exe_file
= get_mm_exe_file(mm
);
1431 *exe_path
= exe_file
->f_path
;
1432 path_get(&exe_file
->f_path
);
1439 static void *proc_pid_follow_link(struct dentry
*dentry
, struct nameidata
*nd
)
1441 struct inode
*inode
= dentry
->d_inode
;
1443 int error
= -EACCES
;
1445 /* Are we allowed to snoop on the tasks file descriptors? */
1446 if (!proc_fd_access_allowed(inode
))
1449 error
= PROC_I(inode
)->op
.proc_get_link(dentry
, &path
);
1453 nd_jump_link(nd
, &path
);
1456 return ERR_PTR(error
);
1459 static int do_proc_readlink(struct path
*path
, char __user
*buffer
, int buflen
)
1461 char *tmp
= (char*)__get_free_page(GFP_TEMPORARY
);
1468 pathname
= d_path(path
, tmp
, PAGE_SIZE
);
1469 len
= PTR_ERR(pathname
);
1470 if (IS_ERR(pathname
))
1472 len
= tmp
+ PAGE_SIZE
- 1 - pathname
;
1476 if (copy_to_user(buffer
, pathname
, len
))
1479 free_page((unsigned long)tmp
);
1483 static int proc_pid_readlink(struct dentry
* dentry
, char __user
* buffer
, int buflen
)
1485 int error
= -EACCES
;
1486 struct inode
*inode
= dentry
->d_inode
;
1489 /* Are we allowed to snoop on the tasks file descriptors? */
1490 if (!proc_fd_access_allowed(inode
))
1493 error
= PROC_I(inode
)->op
.proc_get_link(dentry
, &path
);
1497 error
= do_proc_readlink(&path
, buffer
, buflen
);
1503 static const struct inode_operations proc_pid_link_inode_operations
= {
1504 .readlink
= proc_pid_readlink
,
1505 .follow_link
= proc_pid_follow_link
,
1506 .setattr
= proc_setattr
,
1510 /* building an inode */
1512 static int task_dumpable(struct task_struct
*task
)
1515 struct mm_struct
*mm
;
1520 dumpable
= get_dumpable(mm
);
1527 struct inode
*proc_pid_make_inode(struct super_block
* sb
, struct task_struct
*task
)
1529 struct inode
* inode
;
1530 struct proc_inode
*ei
;
1531 const struct cred
*cred
;
1533 /* We need a new inode */
1535 inode
= new_inode(sb
);
1541 inode
->i_ino
= get_next_ino();
1542 inode
->i_mtime
= inode
->i_atime
= inode
->i_ctime
= CURRENT_TIME
;
1543 inode
->i_op
= &proc_def_inode_operations
;
1546 * grab the reference to task.
1548 ei
->pid
= get_task_pid(task
, PIDTYPE_PID
);
1552 if (task_dumpable(task
)) {
1554 cred
= __task_cred(task
);
1555 inode
->i_uid
= cred
->euid
;
1556 inode
->i_gid
= cred
->egid
;
1559 security_task_to_inode(task
, inode
);
1569 int pid_getattr(struct vfsmount
*mnt
, struct dentry
*dentry
, struct kstat
*stat
)
1571 struct inode
*inode
= dentry
->d_inode
;
1572 struct task_struct
*task
;
1573 const struct cred
*cred
;
1574 struct pid_namespace
*pid
= dentry
->d_sb
->s_fs_info
;
1576 generic_fillattr(inode
, stat
);
1579 stat
->uid
= GLOBAL_ROOT_UID
;
1580 stat
->gid
= GLOBAL_ROOT_GID
;
1581 task
= pid_task(proc_pid(inode
), PIDTYPE_PID
);
1583 if (!has_pid_permissions(pid
, task
, 2)) {
1586 * This doesn't prevent learning whether PID exists,
1587 * it only makes getattr() consistent with readdir().
1591 if ((inode
->i_mode
== (S_IFDIR
|S_IRUGO
|S_IXUGO
)) ||
1592 task_dumpable(task
)) {
1593 cred
= __task_cred(task
);
1594 stat
->uid
= cred
->euid
;
1595 stat
->gid
= cred
->egid
;
1605 * Exceptional case: normally we are not allowed to unhash a busy
1606 * directory. In this case, however, we can do it - no aliasing problems
1607 * due to the way we treat inodes.
1609 * Rewrite the inode's ownerships here because the owning task may have
1610 * performed a setuid(), etc.
1612 * Before the /proc/pid/status file was created the only way to read
1613 * the effective uid of a /process was to stat /proc/pid. Reading
1614 * /proc/pid/status is slow enough that procps and other packages
1615 * kept stating /proc/pid. To keep the rules in /proc simple I have
1616 * made this apply to all per process world readable and executable
1619 int pid_revalidate(struct dentry
*dentry
, unsigned int flags
)
1621 struct inode
*inode
;
1622 struct task_struct
*task
;
1623 const struct cred
*cred
;
1625 if (flags
& LOOKUP_RCU
)
1628 inode
= dentry
->d_inode
;
1629 task
= get_proc_task(inode
);
1632 if ((inode
->i_mode
== (S_IFDIR
|S_IRUGO
|S_IXUGO
)) ||
1633 task_dumpable(task
)) {
1635 cred
= __task_cred(task
);
1636 inode
->i_uid
= cred
->euid
;
1637 inode
->i_gid
= cred
->egid
;
1640 inode
->i_uid
= GLOBAL_ROOT_UID
;
1641 inode
->i_gid
= GLOBAL_ROOT_GID
;
1643 inode
->i_mode
&= ~(S_ISUID
| S_ISGID
);
1644 security_task_to_inode(task
, inode
);
1645 put_task_struct(task
);
1652 static int pid_delete_dentry(const struct dentry
* dentry
)
1654 /* Is the task we represent dead?
1655 * If so, then don't put the dentry on the lru list,
1656 * kill it immediately.
1658 return !proc_pid(dentry
->d_inode
)->tasks
[PIDTYPE_PID
].first
;
1661 const struct dentry_operations pid_dentry_operations
=
1663 .d_revalidate
= pid_revalidate
,
1664 .d_delete
= pid_delete_dentry
,
1670 * Fill a directory entry.
1672 * If possible create the dcache entry and derive our inode number and
1673 * file type from dcache entry.
1675 * Since all of the proc inode numbers are dynamically generated, the inode
1676 * numbers do not exist until the inode is cache. This means creating the
1677 * the dcache entry in readdir is necessary to keep the inode numbers
1678 * reported by readdir in sync with the inode numbers reported
1681 int proc_fill_cache(struct file
*filp
, void *dirent
, filldir_t filldir
,
1682 const char *name
, int len
,
1683 instantiate_t instantiate
, struct task_struct
*task
, const void *ptr
)
1685 struct dentry
*child
, *dir
= filp
->f_path
.dentry
;
1686 struct inode
*inode
;
1689 unsigned type
= DT_UNKNOWN
;
1693 qname
.hash
= full_name_hash(name
, len
);
1695 child
= d_lookup(dir
, &qname
);
1698 new = d_alloc(dir
, &qname
);
1700 child
= instantiate(dir
->d_inode
, new, task
, ptr
);
1707 if (!child
|| IS_ERR(child
) || !child
->d_inode
)
1708 goto end_instantiate
;
1709 inode
= child
->d_inode
;
1712 type
= inode
->i_mode
>> 12;
1717 ino
= find_inode_number(dir
, &qname
);
1720 return filldir(dirent
, name
, len
, filp
->f_pos
, ino
, type
);
1723 static unsigned name_to_int(struct dentry
*dentry
)
1725 const char *name
= dentry
->d_name
.name
;
1726 int len
= dentry
->d_name
.len
;
1729 if (len
> 1 && *name
== '0')
1732 unsigned c
= *name
++ - '0';
1735 if (n
>= (~0U-9)/10)
1745 #define PROC_FDINFO_MAX 64
1747 static int proc_fd_info(struct inode
*inode
, struct path
*path
, char *info
)
1749 struct task_struct
*task
= get_proc_task(inode
);
1750 struct files_struct
*files
= NULL
;
1752 int fd
= proc_fd(inode
);
1755 files
= get_files_struct(task
);
1756 put_task_struct(task
);
1760 * We are not taking a ref to the file structure, so we must
1763 spin_lock(&files
->file_lock
);
1764 file
= fcheck_files(files
, fd
);
1766 unsigned int f_flags
;
1767 struct fdtable
*fdt
;
1769 fdt
= files_fdtable(files
);
1770 f_flags
= file
->f_flags
& ~O_CLOEXEC
;
1771 if (close_on_exec(fd
, fdt
))
1772 f_flags
|= O_CLOEXEC
;
1775 *path
= file
->f_path
;
1776 path_get(&file
->f_path
);
1779 snprintf(info
, PROC_FDINFO_MAX
,
1782 (long long) file
->f_pos
,
1784 spin_unlock(&files
->file_lock
);
1785 put_files_struct(files
);
1788 spin_unlock(&files
->file_lock
);
1789 put_files_struct(files
);
1794 static int proc_fd_link(struct dentry
*dentry
, struct path
*path
)
1796 return proc_fd_info(dentry
->d_inode
, path
, NULL
);
1799 static int tid_fd_revalidate(struct dentry
*dentry
, unsigned int flags
)
1801 struct inode
*inode
;
1802 struct task_struct
*task
;
1804 struct files_struct
*files
;
1805 const struct cred
*cred
;
1807 if (flags
& LOOKUP_RCU
)
1810 inode
= dentry
->d_inode
;
1811 task
= get_proc_task(inode
);
1812 fd
= proc_fd(inode
);
1815 files
= get_files_struct(task
);
1819 file
= fcheck_files(files
, fd
);
1821 unsigned f_mode
= file
->f_mode
;
1824 put_files_struct(files
);
1826 if (task_dumpable(task
)) {
1828 cred
= __task_cred(task
);
1829 inode
->i_uid
= cred
->euid
;
1830 inode
->i_gid
= cred
->egid
;
1833 inode
->i_uid
= GLOBAL_ROOT_UID
;
1834 inode
->i_gid
= GLOBAL_ROOT_GID
;
1837 if (S_ISLNK(inode
->i_mode
)) {
1838 unsigned i_mode
= S_IFLNK
;
1839 if (f_mode
& FMODE_READ
)
1840 i_mode
|= S_IRUSR
| S_IXUSR
;
1841 if (f_mode
& FMODE_WRITE
)
1842 i_mode
|= S_IWUSR
| S_IXUSR
;
1843 inode
->i_mode
= i_mode
;
1846 security_task_to_inode(task
, inode
);
1847 put_task_struct(task
);
1851 put_files_struct(files
);
1853 put_task_struct(task
);
1859 static const struct dentry_operations tid_fd_dentry_operations
=
1861 .d_revalidate
= tid_fd_revalidate
,
1862 .d_delete
= pid_delete_dentry
,
1865 static struct dentry
*proc_fd_instantiate(struct inode
*dir
,
1866 struct dentry
*dentry
, struct task_struct
*task
, const void *ptr
)
1868 unsigned fd
= (unsigned long)ptr
;
1869 struct inode
*inode
;
1870 struct proc_inode
*ei
;
1871 struct dentry
*error
= ERR_PTR(-ENOENT
);
1873 inode
= proc_pid_make_inode(dir
->i_sb
, task
);
1879 inode
->i_mode
= S_IFLNK
;
1880 inode
->i_op
= &proc_pid_link_inode_operations
;
1882 ei
->op
.proc_get_link
= proc_fd_link
;
1883 d_set_d_op(dentry
, &tid_fd_dentry_operations
);
1884 d_add(dentry
, inode
);
1885 /* Close the race of the process dying before we return the dentry */
1886 if (tid_fd_revalidate(dentry
, 0))
1893 static struct dentry
*proc_lookupfd_common(struct inode
*dir
,
1894 struct dentry
*dentry
,
1895 instantiate_t instantiate
)
1897 struct task_struct
*task
= get_proc_task(dir
);
1898 unsigned fd
= name_to_int(dentry
);
1899 struct dentry
*result
= ERR_PTR(-ENOENT
);
1906 result
= instantiate(dir
, dentry
, task
, (void *)(unsigned long)fd
);
1908 put_task_struct(task
);
1913 static int proc_readfd_common(struct file
* filp
, void * dirent
,
1914 filldir_t filldir
, instantiate_t instantiate
)
1916 struct dentry
*dentry
= filp
->f_path
.dentry
;
1917 struct inode
*inode
= dentry
->d_inode
;
1918 struct task_struct
*p
= get_proc_task(inode
);
1919 unsigned int fd
, ino
;
1921 struct files_struct
* files
;
1931 if (filldir(dirent
, ".", 1, 0, inode
->i_ino
, DT_DIR
) < 0)
1935 ino
= parent_ino(dentry
);
1936 if (filldir(dirent
, "..", 2, 1, ino
, DT_DIR
) < 0)
1940 files
= get_files_struct(p
);
1944 for (fd
= filp
->f_pos
-2;
1945 fd
< files_fdtable(files
)->max_fds
;
1946 fd
++, filp
->f_pos
++) {
1947 char name
[PROC_NUMBUF
];
1951 if (!fcheck_files(files
, fd
))
1955 len
= snprintf(name
, sizeof(name
), "%d", fd
);
1956 rv
= proc_fill_cache(filp
, dirent
, filldir
,
1957 name
, len
, instantiate
, p
,
1958 (void *)(unsigned long)fd
);
1965 put_files_struct(files
);
1973 static struct dentry
*proc_lookupfd(struct inode
*dir
, struct dentry
*dentry
,
1976 return proc_lookupfd_common(dir
, dentry
, proc_fd_instantiate
);
1979 static int proc_readfd(struct file
*filp
, void *dirent
, filldir_t filldir
)
1981 return proc_readfd_common(filp
, dirent
, filldir
, proc_fd_instantiate
);
1984 static ssize_t
proc_fdinfo_read(struct file
*file
, char __user
*buf
,
1985 size_t len
, loff_t
*ppos
)
1987 char tmp
[PROC_FDINFO_MAX
];
1988 int err
= proc_fd_info(file
->f_path
.dentry
->d_inode
, NULL
, tmp
);
1990 err
= simple_read_from_buffer(buf
, len
, ppos
, tmp
, strlen(tmp
));
1994 static const struct file_operations proc_fdinfo_file_operations
= {
1995 .open
= nonseekable_open
,
1996 .read
= proc_fdinfo_read
,
1997 .llseek
= no_llseek
,
2000 static const struct file_operations proc_fd_operations
= {
2001 .read
= generic_read_dir
,
2002 .readdir
= proc_readfd
,
2003 .llseek
= default_llseek
,
2006 #ifdef CONFIG_CHECKPOINT_RESTORE
2009 * dname_to_vma_addr - maps a dentry name into two unsigned longs
2010 * which represent vma start and end addresses.
2012 static int dname_to_vma_addr(struct dentry
*dentry
,
2013 unsigned long *start
, unsigned long *end
)
2015 if (sscanf(dentry
->d_name
.name
, "%lx-%lx", start
, end
) != 2)
2021 static int map_files_d_revalidate(struct dentry
*dentry
, unsigned int flags
)
2023 unsigned long vm_start
, vm_end
;
2024 bool exact_vma_exists
= false;
2025 struct mm_struct
*mm
= NULL
;
2026 struct task_struct
*task
;
2027 const struct cred
*cred
;
2028 struct inode
*inode
;
2031 if (flags
& LOOKUP_RCU
)
2034 if (!capable(CAP_SYS_ADMIN
)) {
2039 inode
= dentry
->d_inode
;
2040 task
= get_proc_task(inode
);
2044 mm
= mm_access(task
, PTRACE_MODE_READ
);
2045 if (IS_ERR_OR_NULL(mm
))
2048 if (!dname_to_vma_addr(dentry
, &vm_start
, &vm_end
)) {
2049 down_read(&mm
->mmap_sem
);
2050 exact_vma_exists
= !!find_exact_vma(mm
, vm_start
, vm_end
);
2051 up_read(&mm
->mmap_sem
);
2056 if (exact_vma_exists
) {
2057 if (task_dumpable(task
)) {
2059 cred
= __task_cred(task
);
2060 inode
->i_uid
= cred
->euid
;
2061 inode
->i_gid
= cred
->egid
;
2064 inode
->i_uid
= GLOBAL_ROOT_UID
;
2065 inode
->i_gid
= GLOBAL_ROOT_GID
;
2067 security_task_to_inode(task
, inode
);
2072 put_task_struct(task
);
2081 static const struct dentry_operations tid_map_files_dentry_operations
= {
2082 .d_revalidate
= map_files_d_revalidate
,
2083 .d_delete
= pid_delete_dentry
,
2086 static int proc_map_files_get_link(struct dentry
*dentry
, struct path
*path
)
2088 unsigned long vm_start
, vm_end
;
2089 struct vm_area_struct
*vma
;
2090 struct task_struct
*task
;
2091 struct mm_struct
*mm
;
2095 task
= get_proc_task(dentry
->d_inode
);
2099 mm
= get_task_mm(task
);
2100 put_task_struct(task
);
2104 rc
= dname_to_vma_addr(dentry
, &vm_start
, &vm_end
);
2108 down_read(&mm
->mmap_sem
);
2109 vma
= find_exact_vma(mm
, vm_start
, vm_end
);
2110 if (vma
&& vma
->vm_file
) {
2111 *path
= vma
->vm_file
->f_path
;
2115 up_read(&mm
->mmap_sem
);
2123 struct map_files_info
{
2126 unsigned char name
[4*sizeof(long)+2]; /* max: %lx-%lx\0 */
2129 static struct dentry
*
2130 proc_map_files_instantiate(struct inode
*dir
, struct dentry
*dentry
,
2131 struct task_struct
*task
, const void *ptr
)
2133 const struct file
*file
= ptr
;
2134 struct proc_inode
*ei
;
2135 struct inode
*inode
;
2138 return ERR_PTR(-ENOENT
);
2140 inode
= proc_pid_make_inode(dir
->i_sb
, task
);
2142 return ERR_PTR(-ENOENT
);
2145 ei
->op
.proc_get_link
= proc_map_files_get_link
;
2147 inode
->i_op
= &proc_pid_link_inode_operations
;
2149 inode
->i_mode
= S_IFLNK
;
2151 if (file
->f_mode
& FMODE_READ
)
2152 inode
->i_mode
|= S_IRUSR
;
2153 if (file
->f_mode
& FMODE_WRITE
)
2154 inode
->i_mode
|= S_IWUSR
;
2156 d_set_d_op(dentry
, &tid_map_files_dentry_operations
);
2157 d_add(dentry
, inode
);
2162 static struct dentry
*proc_map_files_lookup(struct inode
*dir
,
2163 struct dentry
*dentry
, unsigned int flags
)
2165 unsigned long vm_start
, vm_end
;
2166 struct vm_area_struct
*vma
;
2167 struct task_struct
*task
;
2168 struct dentry
*result
;
2169 struct mm_struct
*mm
;
2171 result
= ERR_PTR(-EACCES
);
2172 if (!capable(CAP_SYS_ADMIN
))
2175 result
= ERR_PTR(-ENOENT
);
2176 task
= get_proc_task(dir
);
2180 result
= ERR_PTR(-EACCES
);
2181 if (!ptrace_may_access(task
, PTRACE_MODE_READ
))
2184 result
= ERR_PTR(-ENOENT
);
2185 if (dname_to_vma_addr(dentry
, &vm_start
, &vm_end
))
2188 mm
= get_task_mm(task
);
2192 down_read(&mm
->mmap_sem
);
2193 vma
= find_exact_vma(mm
, vm_start
, vm_end
);
2197 result
= proc_map_files_instantiate(dir
, dentry
, task
, vma
->vm_file
);
2200 up_read(&mm
->mmap_sem
);
2203 put_task_struct(task
);
2208 static const struct inode_operations proc_map_files_inode_operations
= {
2209 .lookup
= proc_map_files_lookup
,
2210 .permission
= proc_fd_permission
,
2211 .setattr
= proc_setattr
,
2215 proc_map_files_readdir(struct file
*filp
, void *dirent
, filldir_t filldir
)
2217 struct dentry
*dentry
= filp
->f_path
.dentry
;
2218 struct inode
*inode
= dentry
->d_inode
;
2219 struct vm_area_struct
*vma
;
2220 struct task_struct
*task
;
2221 struct mm_struct
*mm
;
2226 if (!capable(CAP_SYS_ADMIN
))
2230 task
= get_proc_task(inode
);
2235 if (!ptrace_may_access(task
, PTRACE_MODE_READ
))
2239 switch (filp
->f_pos
) {
2242 if (filldir(dirent
, ".", 1, 0, ino
, DT_DIR
) < 0)
2246 ino
= parent_ino(dentry
);
2247 if (filldir(dirent
, "..", 2, 1, ino
, DT_DIR
) < 0)
2252 unsigned long nr_files
, pos
, i
;
2253 struct flex_array
*fa
= NULL
;
2254 struct map_files_info info
;
2255 struct map_files_info
*p
;
2257 mm
= get_task_mm(task
);
2260 down_read(&mm
->mmap_sem
);
2265 * We need two passes here:
2267 * 1) Collect vmas of mapped files with mmap_sem taken
2268 * 2) Release mmap_sem and instantiate entries
2270 * otherwise we get lockdep complained, since filldir()
2271 * routine might require mmap_sem taken in might_fault().
2274 for (vma
= mm
->mmap
, pos
= 2; vma
; vma
= vma
->vm_next
) {
2275 if (vma
->vm_file
&& ++pos
> filp
->f_pos
)
2280 fa
= flex_array_alloc(sizeof(info
), nr_files
,
2282 if (!fa
|| flex_array_prealloc(fa
, 0, nr_files
,
2286 flex_array_free(fa
);
2287 up_read(&mm
->mmap_sem
);
2291 for (i
= 0, vma
= mm
->mmap
, pos
= 2; vma
;
2292 vma
= vma
->vm_next
) {
2295 if (++pos
<= filp
->f_pos
)
2298 get_file(vma
->vm_file
);
2299 info
.file
= vma
->vm_file
;
2300 info
.len
= snprintf(info
.name
,
2301 sizeof(info
.name
), "%lx-%lx",
2302 vma
->vm_start
, vma
->vm_end
);
2303 if (flex_array_put(fa
, i
++, &info
, GFP_KERNEL
))
2307 up_read(&mm
->mmap_sem
);
2309 for (i
= 0; i
< nr_files
; i
++) {
2310 p
= flex_array_get(fa
, i
);
2311 ret
= proc_fill_cache(filp
, dirent
, filldir
,
2313 proc_map_files_instantiate
,
2320 for (; i
< nr_files
; i
++) {
2322 * In case of error don't forget
2323 * to put rest of file refs.
2325 p
= flex_array_get(fa
, i
);
2329 flex_array_free(fa
);
2335 put_task_struct(task
);
2340 static const struct file_operations proc_map_files_operations
= {
2341 .read
= generic_read_dir
,
2342 .readdir
= proc_map_files_readdir
,
2343 .llseek
= default_llseek
,
2346 #endif /* CONFIG_CHECKPOINT_RESTORE */
2349 * /proc/pid/fd needs a special permission handler so that a process can still
2350 * access /proc/self/fd after it has executed a setuid().
2352 static int proc_fd_permission(struct inode
*inode
, int mask
)
2354 int rv
= generic_permission(inode
, mask
);
2357 if (task_pid(current
) == proc_pid(inode
))
2363 * proc directories can do almost nothing..
2365 static const struct inode_operations proc_fd_inode_operations
= {
2366 .lookup
= proc_lookupfd
,
2367 .permission
= proc_fd_permission
,
2368 .setattr
= proc_setattr
,
2371 static struct dentry
*proc_fdinfo_instantiate(struct inode
*dir
,
2372 struct dentry
*dentry
, struct task_struct
*task
, const void *ptr
)
2374 unsigned fd
= (unsigned long)ptr
;
2375 struct inode
*inode
;
2376 struct proc_inode
*ei
;
2377 struct dentry
*error
= ERR_PTR(-ENOENT
);
2379 inode
= proc_pid_make_inode(dir
->i_sb
, task
);
2384 inode
->i_mode
= S_IFREG
| S_IRUSR
;
2385 inode
->i_fop
= &proc_fdinfo_file_operations
;
2386 d_set_d_op(dentry
, &tid_fd_dentry_operations
);
2387 d_add(dentry
, inode
);
2388 /* Close the race of the process dying before we return the dentry */
2389 if (tid_fd_revalidate(dentry
, 0))
2396 static struct dentry
*proc_lookupfdinfo(struct inode
*dir
,
2397 struct dentry
*dentry
,
2400 return proc_lookupfd_common(dir
, dentry
, proc_fdinfo_instantiate
);
2403 static int proc_readfdinfo(struct file
*filp
, void *dirent
, filldir_t filldir
)
2405 return proc_readfd_common(filp
, dirent
, filldir
,
2406 proc_fdinfo_instantiate
);
2409 static const struct file_operations proc_fdinfo_operations
= {
2410 .read
= generic_read_dir
,
2411 .readdir
= proc_readfdinfo
,
2412 .llseek
= default_llseek
,
2416 * proc directories can do almost nothing..
2418 static const struct inode_operations proc_fdinfo_inode_operations
= {
2419 .lookup
= proc_lookupfdinfo
,
2420 .setattr
= proc_setattr
,
2424 static struct dentry
*proc_pident_instantiate(struct inode
*dir
,
2425 struct dentry
*dentry
, struct task_struct
*task
, const void *ptr
)
2427 const struct pid_entry
*p
= ptr
;
2428 struct inode
*inode
;
2429 struct proc_inode
*ei
;
2430 struct dentry
*error
= ERR_PTR(-ENOENT
);
2432 inode
= proc_pid_make_inode(dir
->i_sb
, task
);
2437 inode
->i_mode
= p
->mode
;
2438 if (S_ISDIR(inode
->i_mode
))
2439 set_nlink(inode
, 2); /* Use getattr to fix if necessary */
2441 inode
->i_op
= p
->iop
;
2443 inode
->i_fop
= p
->fop
;
2445 d_set_d_op(dentry
, &pid_dentry_operations
);
2446 d_add(dentry
, inode
);
2447 /* Close the race of the process dying before we return the dentry */
2448 if (pid_revalidate(dentry
, 0))
2454 static struct dentry
*proc_pident_lookup(struct inode
*dir
,
2455 struct dentry
*dentry
,
2456 const struct pid_entry
*ents
,
2459 struct dentry
*error
;
2460 struct task_struct
*task
= get_proc_task(dir
);
2461 const struct pid_entry
*p
, *last
;
2463 error
= ERR_PTR(-ENOENT
);
2469 * Yes, it does not scale. And it should not. Don't add
2470 * new entries into /proc/<tgid>/ without very good reasons.
2472 last
= &ents
[nents
- 1];
2473 for (p
= ents
; p
<= last
; p
++) {
2474 if (p
->len
!= dentry
->d_name
.len
)
2476 if (!memcmp(dentry
->d_name
.name
, p
->name
, p
->len
))
2482 error
= proc_pident_instantiate(dir
, dentry
, task
, p
);
2484 put_task_struct(task
);
2489 static int proc_pident_fill_cache(struct file
*filp
, void *dirent
,
2490 filldir_t filldir
, struct task_struct
*task
, const struct pid_entry
*p
)
2492 return proc_fill_cache(filp
, dirent
, filldir
, p
->name
, p
->len
,
2493 proc_pident_instantiate
, task
, p
);
2496 static int proc_pident_readdir(struct file
*filp
,
2497 void *dirent
, filldir_t filldir
,
2498 const struct pid_entry
*ents
, unsigned int nents
)
2501 struct dentry
*dentry
= filp
->f_path
.dentry
;
2502 struct inode
*inode
= dentry
->d_inode
;
2503 struct task_struct
*task
= get_proc_task(inode
);
2504 const struct pid_entry
*p
, *last
;
2517 if (filldir(dirent
, ".", 1, i
, ino
, DT_DIR
) < 0)
2523 ino
= parent_ino(dentry
);
2524 if (filldir(dirent
, "..", 2, i
, ino
, DT_DIR
) < 0)
2536 last
= &ents
[nents
- 1];
2538 if (proc_pident_fill_cache(filp
, dirent
, filldir
, task
, p
) < 0)
2547 put_task_struct(task
);
2552 #ifdef CONFIG_SECURITY
2553 static ssize_t
proc_pid_attr_read(struct file
* file
, char __user
* buf
,
2554 size_t count
, loff_t
*ppos
)
2556 struct inode
* inode
= file
->f_path
.dentry
->d_inode
;
2559 struct task_struct
*task
= get_proc_task(inode
);
2564 length
= security_getprocattr(task
,
2565 (char*)file
->f_path
.dentry
->d_name
.name
,
2567 put_task_struct(task
);
2569 length
= simple_read_from_buffer(buf
, count
, ppos
, p
, length
);
2574 static ssize_t
proc_pid_attr_write(struct file
* file
, const char __user
* buf
,
2575 size_t count
, loff_t
*ppos
)
2577 struct inode
* inode
= file
->f_path
.dentry
->d_inode
;
2580 struct task_struct
*task
= get_proc_task(inode
);
2585 if (count
> PAGE_SIZE
)
2588 /* No partial writes. */
2594 page
= (char*)__get_free_page(GFP_TEMPORARY
);
2599 if (copy_from_user(page
, buf
, count
))
2602 /* Guard against adverse ptrace interaction */
2603 length
= mutex_lock_interruptible(&task
->signal
->cred_guard_mutex
);
2607 length
= security_setprocattr(task
,
2608 (char*)file
->f_path
.dentry
->d_name
.name
,
2609 (void*)page
, count
);
2610 mutex_unlock(&task
->signal
->cred_guard_mutex
);
2612 free_page((unsigned long) page
);
2614 put_task_struct(task
);
2619 static const struct file_operations proc_pid_attr_operations
= {
2620 .read
= proc_pid_attr_read
,
2621 .write
= proc_pid_attr_write
,
2622 .llseek
= generic_file_llseek
,
2625 static const struct pid_entry attr_dir_stuff
[] = {
2626 REG("current", S_IRUGO
|S_IWUGO
, proc_pid_attr_operations
),
2627 REG("prev", S_IRUGO
, proc_pid_attr_operations
),
2628 REG("exec", S_IRUGO
|S_IWUGO
, proc_pid_attr_operations
),
2629 REG("fscreate", S_IRUGO
|S_IWUGO
, proc_pid_attr_operations
),
2630 REG("keycreate", S_IRUGO
|S_IWUGO
, proc_pid_attr_operations
),
2631 REG("sockcreate", S_IRUGO
|S_IWUGO
, proc_pid_attr_operations
),
2634 static int proc_attr_dir_readdir(struct file
* filp
,
2635 void * dirent
, filldir_t filldir
)
2637 return proc_pident_readdir(filp
,dirent
,filldir
,
2638 attr_dir_stuff
,ARRAY_SIZE(attr_dir_stuff
));
2641 static const struct file_operations proc_attr_dir_operations
= {
2642 .read
= generic_read_dir
,
2643 .readdir
= proc_attr_dir_readdir
,
2644 .llseek
= default_llseek
,
2647 static struct dentry
*proc_attr_dir_lookup(struct inode
*dir
,
2648 struct dentry
*dentry
, unsigned int flags
)
2650 return proc_pident_lookup(dir
, dentry
,
2651 attr_dir_stuff
, ARRAY_SIZE(attr_dir_stuff
));
2654 static const struct inode_operations proc_attr_dir_inode_operations
= {
2655 .lookup
= proc_attr_dir_lookup
,
2656 .getattr
= pid_getattr
,
2657 .setattr
= proc_setattr
,
2662 #ifdef CONFIG_ELF_CORE
2663 static ssize_t
proc_coredump_filter_read(struct file
*file
, char __user
*buf
,
2664 size_t count
, loff_t
*ppos
)
2666 struct task_struct
*task
= get_proc_task(file
->f_dentry
->d_inode
);
2667 struct mm_struct
*mm
;
2668 char buffer
[PROC_NUMBUF
];
2676 mm
= get_task_mm(task
);
2678 len
= snprintf(buffer
, sizeof(buffer
), "%08lx\n",
2679 ((mm
->flags
& MMF_DUMP_FILTER_MASK
) >>
2680 MMF_DUMP_FILTER_SHIFT
));
2682 ret
= simple_read_from_buffer(buf
, count
, ppos
, buffer
, len
);
2685 put_task_struct(task
);
2690 static ssize_t
proc_coredump_filter_write(struct file
*file
,
2691 const char __user
*buf
,
2695 struct task_struct
*task
;
2696 struct mm_struct
*mm
;
2697 char buffer
[PROC_NUMBUF
], *end
;
2704 memset(buffer
, 0, sizeof(buffer
));
2705 if (count
> sizeof(buffer
) - 1)
2706 count
= sizeof(buffer
) - 1;
2707 if (copy_from_user(buffer
, buf
, count
))
2711 val
= (unsigned int)simple_strtoul(buffer
, &end
, 0);
2714 if (end
- buffer
== 0)
2718 task
= get_proc_task(file
->f_dentry
->d_inode
);
2723 mm
= get_task_mm(task
);
2727 for (i
= 0, mask
= 1; i
< MMF_DUMP_FILTER_BITS
; i
++, mask
<<= 1) {
2729 set_bit(i
+ MMF_DUMP_FILTER_SHIFT
, &mm
->flags
);
2731 clear_bit(i
+ MMF_DUMP_FILTER_SHIFT
, &mm
->flags
);
2736 put_task_struct(task
);
2741 static const struct file_operations proc_coredump_filter_operations
= {
2742 .read
= proc_coredump_filter_read
,
2743 .write
= proc_coredump_filter_write
,
2744 .llseek
= generic_file_llseek
,
2751 static int proc_self_readlink(struct dentry
*dentry
, char __user
*buffer
,
2754 struct pid_namespace
*ns
= dentry
->d_sb
->s_fs_info
;
2755 pid_t tgid
= task_tgid_nr_ns(current
, ns
);
2756 char tmp
[PROC_NUMBUF
];
2759 sprintf(tmp
, "%d", tgid
);
2760 return vfs_readlink(dentry
,buffer
,buflen
,tmp
);
2763 static void *proc_self_follow_link(struct dentry
*dentry
, struct nameidata
*nd
)
2765 struct pid_namespace
*ns
= dentry
->d_sb
->s_fs_info
;
2766 pid_t tgid
= task_tgid_nr_ns(current
, ns
);
2767 char *name
= ERR_PTR(-ENOENT
);
2771 name
= ERR_PTR(-ENOMEM
);
2773 sprintf(name
, "%d", tgid
);
2775 nd_set_link(nd
, name
);
2779 static void proc_self_put_link(struct dentry
*dentry
, struct nameidata
*nd
,
2782 char *s
= nd_get_link(nd
);
2787 static const struct inode_operations proc_self_inode_operations
= {
2788 .readlink
= proc_self_readlink
,
2789 .follow_link
= proc_self_follow_link
,
2790 .put_link
= proc_self_put_link
,
2796 * These are the directory entries in the root directory of /proc
2797 * that properly belong to the /proc filesystem, as they describe
2798 * describe something that is process related.
2800 static const struct pid_entry proc_base_stuff
[] = {
2801 NOD("self", S_IFLNK
|S_IRWXUGO
,
2802 &proc_self_inode_operations
, NULL
, {}),
2805 static struct dentry
*proc_base_instantiate(struct inode
*dir
,
2806 struct dentry
*dentry
, struct task_struct
*task
, const void *ptr
)
2808 const struct pid_entry
*p
= ptr
;
2809 struct inode
*inode
;
2810 struct proc_inode
*ei
;
2811 struct dentry
*error
;
2813 /* Allocate the inode */
2814 error
= ERR_PTR(-ENOMEM
);
2815 inode
= new_inode(dir
->i_sb
);
2819 /* Initialize the inode */
2821 inode
->i_ino
= get_next_ino();
2822 inode
->i_mtime
= inode
->i_atime
= inode
->i_ctime
= CURRENT_TIME
;
2825 * grab the reference to the task.
2827 ei
->pid
= get_task_pid(task
, PIDTYPE_PID
);
2831 inode
->i_mode
= p
->mode
;
2832 if (S_ISDIR(inode
->i_mode
))
2833 set_nlink(inode
, 2);
2834 if (S_ISLNK(inode
->i_mode
))
2837 inode
->i_op
= p
->iop
;
2839 inode
->i_fop
= p
->fop
;
2841 d_add(dentry
, inode
);
2850 static struct dentry
*proc_base_lookup(struct inode
*dir
, struct dentry
*dentry
)
2852 struct dentry
*error
;
2853 struct task_struct
*task
= get_proc_task(dir
);
2854 const struct pid_entry
*p
, *last
;
2856 error
= ERR_PTR(-ENOENT
);
2861 /* Lookup the directory entry */
2862 last
= &proc_base_stuff
[ARRAY_SIZE(proc_base_stuff
) - 1];
2863 for (p
= proc_base_stuff
; p
<= last
; p
++) {
2864 if (p
->len
!= dentry
->d_name
.len
)
2866 if (!memcmp(dentry
->d_name
.name
, p
->name
, p
->len
))
2872 error
= proc_base_instantiate(dir
, dentry
, task
, p
);
2875 put_task_struct(task
);
2880 static int proc_base_fill_cache(struct file
*filp
, void *dirent
,
2881 filldir_t filldir
, struct task_struct
*task
, const struct pid_entry
*p
)
2883 return proc_fill_cache(filp
, dirent
, filldir
, p
->name
, p
->len
,
2884 proc_base_instantiate
, task
, p
);
2887 #ifdef CONFIG_TASK_IO_ACCOUNTING
2888 static int do_io_accounting(struct task_struct
*task
, char *buffer
, int whole
)
2890 struct task_io_accounting acct
= task
->ioac
;
2891 unsigned long flags
;
2894 result
= mutex_lock_killable(&task
->signal
->cred_guard_mutex
);
2898 if (!ptrace_may_access(task
, PTRACE_MODE_READ
)) {
2903 if (whole
&& lock_task_sighand(task
, &flags
)) {
2904 struct task_struct
*t
= task
;
2906 task_io_accounting_add(&acct
, &task
->signal
->ioac
);
2907 while_each_thread(task
, t
)
2908 task_io_accounting_add(&acct
, &t
->ioac
);
2910 unlock_task_sighand(task
, &flags
);
2912 result
= sprintf(buffer
,
2917 "read_bytes: %llu\n"
2918 "write_bytes: %llu\n"
2919 "cancelled_write_bytes: %llu\n",
2920 (unsigned long long)acct
.rchar
,
2921 (unsigned long long)acct
.wchar
,
2922 (unsigned long long)acct
.syscr
,
2923 (unsigned long long)acct
.syscw
,
2924 (unsigned long long)acct
.read_bytes
,
2925 (unsigned long long)acct
.write_bytes
,
2926 (unsigned long long)acct
.cancelled_write_bytes
);
2928 mutex_unlock(&task
->signal
->cred_guard_mutex
);
2932 static int proc_tid_io_accounting(struct task_struct
*task
, char *buffer
)
2934 return do_io_accounting(task
, buffer
, 0);
2937 static int proc_tgid_io_accounting(struct task_struct
*task
, char *buffer
)
2939 return do_io_accounting(task
, buffer
, 1);
2941 #endif /* CONFIG_TASK_IO_ACCOUNTING */
2943 #ifdef CONFIG_USER_NS
2944 static int proc_id_map_open(struct inode
*inode
, struct file
*file
,
2945 struct seq_operations
*seq_ops
)
2947 struct user_namespace
*ns
= NULL
;
2948 struct task_struct
*task
;
2949 struct seq_file
*seq
;
2952 task
= get_proc_task(inode
);
2955 ns
= get_user_ns(task_cred_xxx(task
, user_ns
));
2957 put_task_struct(task
);
2962 ret
= seq_open(file
, seq_ops
);
2966 seq
= file
->private_data
;
2976 static int proc_id_map_release(struct inode
*inode
, struct file
*file
)
2978 struct seq_file
*seq
= file
->private_data
;
2979 struct user_namespace
*ns
= seq
->private;
2981 return seq_release(inode
, file
);
2984 static int proc_uid_map_open(struct inode
*inode
, struct file
*file
)
2986 return proc_id_map_open(inode
, file
, &proc_uid_seq_operations
);
2989 static int proc_gid_map_open(struct inode
*inode
, struct file
*file
)
2991 return proc_id_map_open(inode
, file
, &proc_gid_seq_operations
);
2994 static int proc_projid_map_open(struct inode
*inode
, struct file
*file
)
2996 return proc_id_map_open(inode
, file
, &proc_projid_seq_operations
);
2999 static const struct file_operations proc_uid_map_operations
= {
3000 .open
= proc_uid_map_open
,
3001 .write
= proc_uid_map_write
,
3003 .llseek
= seq_lseek
,
3004 .release
= proc_id_map_release
,
3007 static const struct file_operations proc_gid_map_operations
= {
3008 .open
= proc_gid_map_open
,
3009 .write
= proc_gid_map_write
,
3011 .llseek
= seq_lseek
,
3012 .release
= proc_id_map_release
,
3015 static const struct file_operations proc_projid_map_operations
= {
3016 .open
= proc_projid_map_open
,
3017 .write
= proc_projid_map_write
,
3019 .llseek
= seq_lseek
,
3020 .release
= proc_id_map_release
,
3022 #endif /* CONFIG_USER_NS */
3024 static int proc_pid_personality(struct seq_file
*m
, struct pid_namespace
*ns
,
3025 struct pid
*pid
, struct task_struct
*task
)
3027 int err
= lock_trace(task
);
3029 seq_printf(m
, "%08x\n", task
->personality
);
3038 static const struct file_operations proc_task_operations
;
3039 static const struct inode_operations proc_task_inode_operations
;
3041 static const struct pid_entry tgid_base_stuff
[] = {
3042 DIR("task", S_IRUGO
|S_IXUGO
, proc_task_inode_operations
, proc_task_operations
),
3043 DIR("fd", S_IRUSR
|S_IXUSR
, proc_fd_inode_operations
, proc_fd_operations
),
3044 #ifdef CONFIG_CHECKPOINT_RESTORE
3045 DIR("map_files", S_IRUSR
|S_IXUSR
, proc_map_files_inode_operations
, proc_map_files_operations
),
3047 DIR("fdinfo", S_IRUSR
|S_IXUSR
, proc_fdinfo_inode_operations
, proc_fdinfo_operations
),
3048 DIR("ns", S_IRUSR
|S_IXUGO
, proc_ns_dir_inode_operations
, proc_ns_dir_operations
),
3050 DIR("net", S_IRUGO
|S_IXUGO
, proc_net_inode_operations
, proc_net_operations
),
3052 REG("environ", S_IRUSR
, proc_environ_operations
),
3053 INF("auxv", S_IRUSR
, proc_pid_auxv
),
3054 ONE("status", S_IRUGO
, proc_pid_status
),
3055 ONE("personality", S_IRUGO
, proc_pid_personality
),
3056 INF("limits", S_IRUGO
, proc_pid_limits
),
3057 #ifdef CONFIG_SCHED_DEBUG
3058 REG("sched", S_IRUGO
|S_IWUSR
, proc_pid_sched_operations
),
3060 #ifdef CONFIG_SCHED_AUTOGROUP
3061 REG("autogroup", S_IRUGO
|S_IWUSR
, proc_pid_sched_autogroup_operations
),
3063 REG("comm", S_IRUGO
|S_IWUSR
, proc_pid_set_comm_operations
),
3064 #ifdef CONFIG_HAVE_ARCH_TRACEHOOK
3065 INF("syscall", S_IRUGO
, proc_pid_syscall
),
3067 INF("cmdline", S_IRUGO
, proc_pid_cmdline
),
3068 ONE("stat", S_IRUGO
, proc_tgid_stat
),
3069 ONE("statm", S_IRUGO
, proc_pid_statm
),
3070 REG("maps", S_IRUGO
, proc_pid_maps_operations
),
3072 REG("numa_maps", S_IRUGO
, proc_pid_numa_maps_operations
),
3074 REG("mem", S_IRUSR
|S_IWUSR
, proc_mem_operations
),
3075 LNK("cwd", proc_cwd_link
),
3076 LNK("root", proc_root_link
),
3077 LNK("exe", proc_exe_link
),
3078 REG("mounts", S_IRUGO
, proc_mounts_operations
),
3079 REG("mountinfo", S_IRUGO
, proc_mountinfo_operations
),
3080 REG("mountstats", S_IRUSR
, proc_mountstats_operations
),
3081 #ifdef CONFIG_PROC_PAGE_MONITOR
3082 REG("clear_refs", S_IWUSR
, proc_clear_refs_operations
),
3083 REG("smaps", S_IRUGO
, proc_pid_smaps_operations
),
3084 REG("pagemap", S_IRUGO
, proc_pagemap_operations
),
3086 #ifdef CONFIG_SECURITY
3087 DIR("attr", S_IRUGO
|S_IXUGO
, proc_attr_dir_inode_operations
, proc_attr_dir_operations
),
3089 #ifdef CONFIG_KALLSYMS
3090 INF("wchan", S_IRUGO
, proc_pid_wchan
),
3092 #ifdef CONFIG_STACKTRACE
3093 ONE("stack", S_IRUGO
, proc_pid_stack
),
3095 #ifdef CONFIG_SCHEDSTATS
3096 INF("schedstat", S_IRUGO
, proc_pid_schedstat
),
3098 #ifdef CONFIG_LATENCYTOP
3099 REG("latency", S_IRUGO
, proc_lstats_operations
),
3101 #ifdef CONFIG_PROC_PID_CPUSET
3102 REG("cpuset", S_IRUGO
, proc_cpuset_operations
),
3104 #ifdef CONFIG_CGROUPS
3105 REG("cgroup", S_IRUGO
, proc_cgroup_operations
),
3107 INF("oom_score", S_IRUGO
, proc_oom_score
),
3108 REG("oom_adj", S_IRUGO
|S_IWUSR
, proc_oom_adjust_operations
),
3109 REG("oom_score_adj", S_IRUGO
|S_IWUSR
, proc_oom_score_adj_operations
),
3110 #ifdef CONFIG_AUDITSYSCALL
3111 REG("loginuid", S_IWUSR
|S_IRUGO
, proc_loginuid_operations
),
3112 REG("sessionid", S_IRUGO
, proc_sessionid_operations
),
3114 #ifdef CONFIG_FAULT_INJECTION
3115 REG("make-it-fail", S_IRUGO
|S_IWUSR
, proc_fault_inject_operations
),
3117 #ifdef CONFIG_ELF_CORE
3118 REG("coredump_filter", S_IRUGO
|S_IWUSR
, proc_coredump_filter_operations
),
3120 #ifdef CONFIG_TASK_IO_ACCOUNTING
3121 INF("io", S_IRUSR
, proc_tgid_io_accounting
),
3123 #ifdef CONFIG_HARDWALL
3124 INF("hardwall", S_IRUGO
, proc_pid_hardwall
),
3126 #ifdef CONFIG_USER_NS
3127 REG("uid_map", S_IRUGO
|S_IWUSR
, proc_uid_map_operations
),
3128 REG("gid_map", S_IRUGO
|S_IWUSR
, proc_gid_map_operations
),
3129 REG("projid_map", S_IRUGO
|S_IWUSR
, proc_projid_map_operations
),
3133 static int proc_tgid_base_readdir(struct file
* filp
,
3134 void * dirent
, filldir_t filldir
)
3136 return proc_pident_readdir(filp
,dirent
,filldir
,
3137 tgid_base_stuff
,ARRAY_SIZE(tgid_base_stuff
));
3140 static const struct file_operations proc_tgid_base_operations
= {
3141 .read
= generic_read_dir
,
3142 .readdir
= proc_tgid_base_readdir
,
3143 .llseek
= default_llseek
,
3146 static struct dentry
*proc_tgid_base_lookup(struct inode
*dir
, struct dentry
*dentry
, unsigned int flags
)
3148 return proc_pident_lookup(dir
, dentry
,
3149 tgid_base_stuff
, ARRAY_SIZE(tgid_base_stuff
));
3152 static const struct inode_operations proc_tgid_base_inode_operations
= {
3153 .lookup
= proc_tgid_base_lookup
,
3154 .getattr
= pid_getattr
,
3155 .setattr
= proc_setattr
,
3156 .permission
= proc_pid_permission
,
3159 static void proc_flush_task_mnt(struct vfsmount
*mnt
, pid_t pid
, pid_t tgid
)
3161 struct dentry
*dentry
, *leader
, *dir
;
3162 char buf
[PROC_NUMBUF
];
3166 name
.len
= snprintf(buf
, sizeof(buf
), "%d", pid
);
3167 dentry
= d_hash_and_lookup(mnt
->mnt_root
, &name
);
3169 shrink_dcache_parent(dentry
);
3175 name
.len
= snprintf(buf
, sizeof(buf
), "%d", tgid
);
3176 leader
= d_hash_and_lookup(mnt
->mnt_root
, &name
);
3181 name
.len
= strlen(name
.name
);
3182 dir
= d_hash_and_lookup(leader
, &name
);
3184 goto out_put_leader
;
3187 name
.len
= snprintf(buf
, sizeof(buf
), "%d", pid
);
3188 dentry
= d_hash_and_lookup(dir
, &name
);
3190 shrink_dcache_parent(dentry
);
3203 * proc_flush_task - Remove dcache entries for @task from the /proc dcache.
3204 * @task: task that should be flushed.
3206 * When flushing dentries from proc, one needs to flush them from global
3207 * proc (proc_mnt) and from all the namespaces' procs this task was seen
3208 * in. This call is supposed to do all of this job.
3210 * Looks in the dcache for
3212 * /proc/@tgid/task/@pid
3213 * if either directory is present flushes it and all of it'ts children
3216 * It is safe and reasonable to cache /proc entries for a task until
3217 * that task exits. After that they just clog up the dcache with
3218 * useless entries, possibly causing useful dcache entries to be
3219 * flushed instead. This routine is proved to flush those useless
3220 * dcache entries at process exit time.
3222 * NOTE: This routine is just an optimization so it does not guarantee
3223 * that no dcache entries will exist at process exit time it
3224 * just makes it very unlikely that any will persist.
3227 void proc_flush_task(struct task_struct
*task
)
3230 struct pid
*pid
, *tgid
;
3233 pid
= task_pid(task
);
3234 tgid
= task_tgid(task
);
3236 for (i
= 0; i
<= pid
->level
; i
++) {
3237 upid
= &pid
->numbers
[i
];
3238 proc_flush_task_mnt(upid
->ns
->proc_mnt
, upid
->nr
,
3239 tgid
->numbers
[i
].nr
);
3242 upid
= &pid
->numbers
[pid
->level
];
3244 pid_ns_release_proc(upid
->ns
);
3247 static struct dentry
*proc_pid_instantiate(struct inode
*dir
,
3248 struct dentry
* dentry
,
3249 struct task_struct
*task
, const void *ptr
)
3251 struct dentry
*error
= ERR_PTR(-ENOENT
);
3252 struct inode
*inode
;
3254 inode
= proc_pid_make_inode(dir
->i_sb
, task
);
3258 inode
->i_mode
= S_IFDIR
|S_IRUGO
|S_IXUGO
;
3259 inode
->i_op
= &proc_tgid_base_inode_operations
;
3260 inode
->i_fop
= &proc_tgid_base_operations
;
3261 inode
->i_flags
|=S_IMMUTABLE
;
3263 set_nlink(inode
, 2 + pid_entry_count_dirs(tgid_base_stuff
,
3264 ARRAY_SIZE(tgid_base_stuff
)));
3266 d_set_d_op(dentry
, &pid_dentry_operations
);
3268 d_add(dentry
, inode
);
3269 /* Close the race of the process dying before we return the dentry */
3270 if (pid_revalidate(dentry
, 0))
3276 struct dentry
*proc_pid_lookup(struct inode
*dir
, struct dentry
* dentry
, unsigned int flags
)
3278 struct dentry
*result
;
3279 struct task_struct
*task
;
3281 struct pid_namespace
*ns
;
3283 result
= proc_base_lookup(dir
, dentry
);
3284 if (!IS_ERR(result
) || PTR_ERR(result
) != -ENOENT
)
3287 tgid
= name_to_int(dentry
);
3291 ns
= dentry
->d_sb
->s_fs_info
;
3293 task
= find_task_by_pid_ns(tgid
, ns
);
3295 get_task_struct(task
);
3300 result
= proc_pid_instantiate(dir
, dentry
, task
, NULL
);
3301 put_task_struct(task
);
3307 * Find the first task with tgid >= tgid
3312 struct task_struct
*task
;
3314 static struct tgid_iter
next_tgid(struct pid_namespace
*ns
, struct tgid_iter iter
)
3319 put_task_struct(iter
.task
);
3323 pid
= find_ge_pid(iter
.tgid
, ns
);
3325 iter
.tgid
= pid_nr_ns(pid
, ns
);
3326 iter
.task
= pid_task(pid
, PIDTYPE_PID
);
3327 /* What we to know is if the pid we have find is the
3328 * pid of a thread_group_leader. Testing for task
3329 * being a thread_group_leader is the obvious thing
3330 * todo but there is a window when it fails, due to
3331 * the pid transfer logic in de_thread.
3333 * So we perform the straight forward test of seeing
3334 * if the pid we have found is the pid of a thread
3335 * group leader, and don't worry if the task we have
3336 * found doesn't happen to be a thread group leader.
3337 * As we don't care in the case of readdir.
3339 if (!iter
.task
|| !has_group_leader_pid(iter
.task
)) {
3343 get_task_struct(iter
.task
);
3349 #define TGID_OFFSET (FIRST_PROCESS_ENTRY + ARRAY_SIZE(proc_base_stuff))
3351 static int proc_pid_fill_cache(struct file
*filp
, void *dirent
, filldir_t filldir
,
3352 struct tgid_iter iter
)
3354 char name
[PROC_NUMBUF
];
3355 int len
= snprintf(name
, sizeof(name
), "%d", iter
.tgid
);
3356 return proc_fill_cache(filp
, dirent
, filldir
, name
, len
,
3357 proc_pid_instantiate
, iter
.task
, NULL
);
3360 static int fake_filldir(void *buf
, const char *name
, int namelen
,
3361 loff_t offset
, u64 ino
, unsigned d_type
)
3366 /* for the /proc/ directory itself, after non-process stuff has been done */
3367 int proc_pid_readdir(struct file
* filp
, void * dirent
, filldir_t filldir
)
3370 struct task_struct
*reaper
;
3371 struct tgid_iter iter
;
3372 struct pid_namespace
*ns
;
3373 filldir_t __filldir
;
3375 if (filp
->f_pos
>= PID_MAX_LIMIT
+ TGID_OFFSET
)
3377 nr
= filp
->f_pos
- FIRST_PROCESS_ENTRY
;
3379 reaper
= get_proc_task(filp
->f_path
.dentry
->d_inode
);
3383 for (; nr
< ARRAY_SIZE(proc_base_stuff
); filp
->f_pos
++, nr
++) {
3384 const struct pid_entry
*p
= &proc_base_stuff
[nr
];
3385 if (proc_base_fill_cache(filp
, dirent
, filldir
, reaper
, p
) < 0)
3389 ns
= filp
->f_dentry
->d_sb
->s_fs_info
;
3391 iter
.tgid
= filp
->f_pos
- TGID_OFFSET
;
3392 for (iter
= next_tgid(ns
, iter
);
3394 iter
.tgid
+= 1, iter
= next_tgid(ns
, iter
)) {
3395 if (has_pid_permissions(ns
, iter
.task
, 2))
3396 __filldir
= filldir
;
3398 __filldir
= fake_filldir
;
3400 filp
->f_pos
= iter
.tgid
+ TGID_OFFSET
;
3401 if (proc_pid_fill_cache(filp
, dirent
, __filldir
, iter
) < 0) {
3402 put_task_struct(iter
.task
);
3406 filp
->f_pos
= PID_MAX_LIMIT
+ TGID_OFFSET
;
3408 put_task_struct(reaper
);
3416 static const struct pid_entry tid_base_stuff
[] = {
3417 DIR("fd", S_IRUSR
|S_IXUSR
, proc_fd_inode_operations
, proc_fd_operations
),
3418 DIR("fdinfo", S_IRUSR
|S_IXUSR
, proc_fdinfo_inode_operations
, proc_fdinfo_operations
),
3419 DIR("ns", S_IRUSR
|S_IXUGO
, proc_ns_dir_inode_operations
, proc_ns_dir_operations
),
3420 REG("environ", S_IRUSR
, proc_environ_operations
),
3421 INF("auxv", S_IRUSR
, proc_pid_auxv
),
3422 ONE("status", S_IRUGO
, proc_pid_status
),
3423 ONE("personality", S_IRUGO
, proc_pid_personality
),
3424 INF("limits", S_IRUGO
, proc_pid_limits
),
3425 #ifdef CONFIG_SCHED_DEBUG
3426 REG("sched", S_IRUGO
|S_IWUSR
, proc_pid_sched_operations
),
3428 REG("comm", S_IRUGO
|S_IWUSR
, proc_pid_set_comm_operations
),
3429 #ifdef CONFIG_HAVE_ARCH_TRACEHOOK
3430 INF("syscall", S_IRUGO
, proc_pid_syscall
),
3432 INF("cmdline", S_IRUGO
, proc_pid_cmdline
),
3433 ONE("stat", S_IRUGO
, proc_tid_stat
),
3434 ONE("statm", S_IRUGO
, proc_pid_statm
),
3435 REG("maps", S_IRUGO
, proc_tid_maps_operations
),
3436 #ifdef CONFIG_CHECKPOINT_RESTORE
3437 REG("children", S_IRUGO
, proc_tid_children_operations
),
3440 REG("numa_maps", S_IRUGO
, proc_tid_numa_maps_operations
),
3442 REG("mem", S_IRUSR
|S_IWUSR
, proc_mem_operations
),
3443 LNK("cwd", proc_cwd_link
),
3444 LNK("root", proc_root_link
),
3445 LNK("exe", proc_exe_link
),
3446 REG("mounts", S_IRUGO
, proc_mounts_operations
),
3447 REG("mountinfo", S_IRUGO
, proc_mountinfo_operations
),
3448 #ifdef CONFIG_PROC_PAGE_MONITOR
3449 REG("clear_refs", S_IWUSR
, proc_clear_refs_operations
),
3450 REG("smaps", S_IRUGO
, proc_tid_smaps_operations
),
3451 REG("pagemap", S_IRUGO
, proc_pagemap_operations
),
3453 #ifdef CONFIG_SECURITY
3454 DIR("attr", S_IRUGO
|S_IXUGO
, proc_attr_dir_inode_operations
, proc_attr_dir_operations
),
3456 #ifdef CONFIG_KALLSYMS
3457 INF("wchan", S_IRUGO
, proc_pid_wchan
),
3459 #ifdef CONFIG_STACKTRACE
3460 ONE("stack", S_IRUGO
, proc_pid_stack
),
3462 #ifdef CONFIG_SCHEDSTATS
3463 INF("schedstat", S_IRUGO
, proc_pid_schedstat
),
3465 #ifdef CONFIG_LATENCYTOP
3466 REG("latency", S_IRUGO
, proc_lstats_operations
),
3468 #ifdef CONFIG_PROC_PID_CPUSET
3469 REG("cpuset", S_IRUGO
, proc_cpuset_operations
),
3471 #ifdef CONFIG_CGROUPS
3472 REG("cgroup", S_IRUGO
, proc_cgroup_operations
),
3474 INF("oom_score", S_IRUGO
, proc_oom_score
),
3475 REG("oom_adj", S_IRUGO
|S_IWUSR
, proc_oom_adjust_operations
),
3476 REG("oom_score_adj", S_IRUGO
|S_IWUSR
, proc_oom_score_adj_operations
),
3477 #ifdef CONFIG_AUDITSYSCALL
3478 REG("loginuid", S_IWUSR
|S_IRUGO
, proc_loginuid_operations
),
3479 REG("sessionid", S_IRUGO
, proc_sessionid_operations
),
3481 #ifdef CONFIG_FAULT_INJECTION
3482 REG("make-it-fail", S_IRUGO
|S_IWUSR
, proc_fault_inject_operations
),
3484 #ifdef CONFIG_TASK_IO_ACCOUNTING
3485 INF("io", S_IRUSR
, proc_tid_io_accounting
),
3487 #ifdef CONFIG_HARDWALL
3488 INF("hardwall", S_IRUGO
, proc_pid_hardwall
),
3490 #ifdef CONFIG_USER_NS
3491 REG("uid_map", S_IRUGO
|S_IWUSR
, proc_uid_map_operations
),
3492 REG("gid_map", S_IRUGO
|S_IWUSR
, proc_gid_map_operations
),
3493 REG("projid_map", S_IRUGO
|S_IWUSR
, proc_projid_map_operations
),
3497 static int proc_tid_base_readdir(struct file
* filp
,
3498 void * dirent
, filldir_t filldir
)
3500 return proc_pident_readdir(filp
,dirent
,filldir
,
3501 tid_base_stuff
,ARRAY_SIZE(tid_base_stuff
));
3504 static struct dentry
*proc_tid_base_lookup(struct inode
*dir
, struct dentry
*dentry
, unsigned int flags
)
3506 return proc_pident_lookup(dir
, dentry
,
3507 tid_base_stuff
, ARRAY_SIZE(tid_base_stuff
));
3510 static const struct file_operations proc_tid_base_operations
= {
3511 .read
= generic_read_dir
,
3512 .readdir
= proc_tid_base_readdir
,
3513 .llseek
= default_llseek
,
3516 static const struct inode_operations proc_tid_base_inode_operations
= {
3517 .lookup
= proc_tid_base_lookup
,
3518 .getattr
= pid_getattr
,
3519 .setattr
= proc_setattr
,
3522 static struct dentry
*proc_task_instantiate(struct inode
*dir
,
3523 struct dentry
*dentry
, struct task_struct
*task
, const void *ptr
)
3525 struct dentry
*error
= ERR_PTR(-ENOENT
);
3526 struct inode
*inode
;
3527 inode
= proc_pid_make_inode(dir
->i_sb
, task
);
3531 inode
->i_mode
= S_IFDIR
|S_IRUGO
|S_IXUGO
;
3532 inode
->i_op
= &proc_tid_base_inode_operations
;
3533 inode
->i_fop
= &proc_tid_base_operations
;
3534 inode
->i_flags
|=S_IMMUTABLE
;
3536 set_nlink(inode
, 2 + pid_entry_count_dirs(tid_base_stuff
,
3537 ARRAY_SIZE(tid_base_stuff
)));
3539 d_set_d_op(dentry
, &pid_dentry_operations
);
3541 d_add(dentry
, inode
);
3542 /* Close the race of the process dying before we return the dentry */
3543 if (pid_revalidate(dentry
, 0))
3549 static struct dentry
*proc_task_lookup(struct inode
*dir
, struct dentry
* dentry
, unsigned int flags
)
3551 struct dentry
*result
= ERR_PTR(-ENOENT
);
3552 struct task_struct
*task
;
3553 struct task_struct
*leader
= get_proc_task(dir
);
3555 struct pid_namespace
*ns
;
3560 tid
= name_to_int(dentry
);
3564 ns
= dentry
->d_sb
->s_fs_info
;
3566 task
= find_task_by_pid_ns(tid
, ns
);
3568 get_task_struct(task
);
3572 if (!same_thread_group(leader
, task
))
3575 result
= proc_task_instantiate(dir
, dentry
, task
, NULL
);
3577 put_task_struct(task
);
3579 put_task_struct(leader
);
3585 * Find the first tid of a thread group to return to user space.
3587 * Usually this is just the thread group leader, but if the users
3588 * buffer was too small or there was a seek into the middle of the
3589 * directory we have more work todo.
3591 * In the case of a short read we start with find_task_by_pid.
3593 * In the case of a seek we start with the leader and walk nr
3596 static struct task_struct
*first_tid(struct task_struct
*leader
,
3597 int tid
, int nr
, struct pid_namespace
*ns
)
3599 struct task_struct
*pos
;
3602 /* Attempt to start with the pid of a thread */
3603 if (tid
&& (nr
> 0)) {
3604 pos
= find_task_by_pid_ns(tid
, ns
);
3605 if (pos
&& (pos
->group_leader
== leader
))
3609 /* If nr exceeds the number of threads there is nothing todo */
3611 if (nr
&& nr
>= get_nr_threads(leader
))
3614 /* If we haven't found our starting place yet start
3615 * with the leader and walk nr threads forward.
3617 for (pos
= leader
; nr
> 0; --nr
) {
3618 pos
= next_thread(pos
);
3619 if (pos
== leader
) {
3625 get_task_struct(pos
);
3632 * Find the next thread in the thread list.
3633 * Return NULL if there is an error or no next thread.
3635 * The reference to the input task_struct is released.
3637 static struct task_struct
*next_tid(struct task_struct
*start
)
3639 struct task_struct
*pos
= NULL
;
3641 if (pid_alive(start
)) {
3642 pos
= next_thread(start
);
3643 if (thread_group_leader(pos
))
3646 get_task_struct(pos
);
3649 put_task_struct(start
);
3653 static int proc_task_fill_cache(struct file
*filp
, void *dirent
, filldir_t filldir
,
3654 struct task_struct
*task
, int tid
)
3656 char name
[PROC_NUMBUF
];
3657 int len
= snprintf(name
, sizeof(name
), "%d", tid
);
3658 return proc_fill_cache(filp
, dirent
, filldir
, name
, len
,
3659 proc_task_instantiate
, task
, NULL
);
3662 /* for the /proc/TGID/task/ directories */
3663 static int proc_task_readdir(struct file
* filp
, void * dirent
, filldir_t filldir
)
3665 struct dentry
*dentry
= filp
->f_path
.dentry
;
3666 struct inode
*inode
= dentry
->d_inode
;
3667 struct task_struct
*leader
= NULL
;
3668 struct task_struct
*task
;
3669 int retval
= -ENOENT
;
3672 struct pid_namespace
*ns
;
3674 task
= get_proc_task(inode
);
3678 if (pid_alive(task
)) {
3679 leader
= task
->group_leader
;
3680 get_task_struct(leader
);
3683 put_task_struct(task
);
3688 switch ((unsigned long)filp
->f_pos
) {
3691 if (filldir(dirent
, ".", 1, filp
->f_pos
, ino
, DT_DIR
) < 0)
3696 ino
= parent_ino(dentry
);
3697 if (filldir(dirent
, "..", 2, filp
->f_pos
, ino
, DT_DIR
) < 0)
3703 /* f_version caches the tgid value that the last readdir call couldn't
3704 * return. lseek aka telldir automagically resets f_version to 0.
3706 ns
= filp
->f_dentry
->d_sb
->s_fs_info
;
3707 tid
= (int)filp
->f_version
;
3708 filp
->f_version
= 0;
3709 for (task
= first_tid(leader
, tid
, filp
->f_pos
- 2, ns
);
3711 task
= next_tid(task
), filp
->f_pos
++) {
3712 tid
= task_pid_nr_ns(task
, ns
);
3713 if (proc_task_fill_cache(filp
, dirent
, filldir
, task
, tid
) < 0) {
3714 /* returning this tgid failed, save it as the first
3715 * pid for the next readir call */
3716 filp
->f_version
= (u64
)tid
;
3717 put_task_struct(task
);
3722 put_task_struct(leader
);
3727 static int proc_task_getattr(struct vfsmount
*mnt
, struct dentry
*dentry
, struct kstat
*stat
)
3729 struct inode
*inode
= dentry
->d_inode
;
3730 struct task_struct
*p
= get_proc_task(inode
);
3731 generic_fillattr(inode
, stat
);
3734 stat
->nlink
+= get_nr_threads(p
);
3741 static const struct inode_operations proc_task_inode_operations
= {
3742 .lookup
= proc_task_lookup
,
3743 .getattr
= proc_task_getattr
,
3744 .setattr
= proc_setattr
,
3745 .permission
= proc_pid_permission
,
3748 static const struct file_operations proc_task_operations
= {
3749 .read
= generic_read_dir
,
3750 .readdir
= proc_task_readdir
,
3751 .llseek
= default_llseek
,