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1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * umh - the kernel usermode helper
4 */
5 #include <linux/module.h>
6 #include <linux/sched.h>
7 #include <linux/sched/task.h>
8 #include <linux/binfmts.h>
9 #include <linux/syscalls.h>
10 #include <linux/unistd.h>
11 #include <linux/kmod.h>
12 #include <linux/slab.h>
13 #include <linux/completion.h>
14 #include <linux/cred.h>
15 #include <linux/file.h>
16 #include <linux/fdtable.h>
17 #include <linux/workqueue.h>
18 #include <linux/security.h>
19 #include <linux/mount.h>
20 #include <linux/kernel.h>
21 #include <linux/init.h>
22 #include <linux/resource.h>
23 #include <linux/notifier.h>
24 #include <linux/suspend.h>
25 #include <linux/rwsem.h>
26 #include <linux/ptrace.h>
27 #include <linux/async.h>
28 #include <linux/uaccess.h>
29 #include <linux/shmem_fs.h>
30 #include <linux/pipe_fs_i.h>
31
32 #include <trace/events/module.h>
33
34 #define CAP_BSET (void *)1
35 #define CAP_PI (void *)2
36
37 static kernel_cap_t usermodehelper_bset = CAP_FULL_SET;
38 static kernel_cap_t usermodehelper_inheritable = CAP_FULL_SET;
39 static DEFINE_SPINLOCK(umh_sysctl_lock);
40 static DECLARE_RWSEM(umhelper_sem);
41 static LIST_HEAD(umh_list);
42 static DEFINE_MUTEX(umh_list_lock);
43
44 static void call_usermodehelper_freeinfo(struct subprocess_info *info)
45 {
46 if (info->cleanup)
47 (*info->cleanup)(info);
48 kfree(info);
49 }
50
51 static void umh_complete(struct subprocess_info *sub_info)
52 {
53 struct completion *comp = xchg(&sub_info->complete, NULL);
54 /*
55 * See call_usermodehelper_exec(). If xchg() returns NULL
56 * we own sub_info, the UMH_KILLABLE caller has gone away
57 * or the caller used UMH_NO_WAIT.
58 */
59 if (comp)
60 complete(comp);
61 else
62 call_usermodehelper_freeinfo(sub_info);
63 }
64
65 /*
66 * This is the task which runs the usermode application
67 */
68 static int call_usermodehelper_exec_async(void *data)
69 {
70 struct subprocess_info *sub_info = data;
71 struct cred *new;
72 int retval;
73
74 spin_lock_irq(&current->sighand->siglock);
75 flush_signal_handlers(current, 1);
76 spin_unlock_irq(&current->sighand->siglock);
77
78 /*
79 * Our parent (unbound workqueue) runs with elevated scheduling
80 * priority. Avoid propagating that into the userspace child.
81 */
82 set_user_nice(current, 0);
83
84 retval = -ENOMEM;
85 new = prepare_kernel_cred(current);
86 if (!new)
87 goto out;
88
89 spin_lock(&umh_sysctl_lock);
90 new->cap_bset = cap_intersect(usermodehelper_bset, new->cap_bset);
91 new->cap_inheritable = cap_intersect(usermodehelper_inheritable,
92 new->cap_inheritable);
93 spin_unlock(&umh_sysctl_lock);
94
95 if (sub_info->init) {
96 retval = sub_info->init(sub_info, new);
97 if (retval) {
98 abort_creds(new);
99 goto out;
100 }
101 }
102
103 commit_creds(new);
104
105 sub_info->pid = task_pid_nr(current);
106 if (sub_info->file) {
107 retval = do_execve_file(sub_info->file,
108 sub_info->argv, sub_info->envp);
109 if (!retval)
110 current->flags |= PF_UMH;
111 } else
112 retval = do_execve(getname_kernel(sub_info->path),
113 (const char __user *const __user *)sub_info->argv,
114 (const char __user *const __user *)sub_info->envp);
115 out:
116 sub_info->retval = retval;
117 /*
118 * call_usermodehelper_exec_sync() will call umh_complete
119 * if UHM_WAIT_PROC.
120 */
121 if (!(sub_info->wait & UMH_WAIT_PROC))
122 umh_complete(sub_info);
123 if (!retval)
124 return 0;
125 do_exit(0);
126 }
127
128 /* Handles UMH_WAIT_PROC. */
129 static void call_usermodehelper_exec_sync(struct subprocess_info *sub_info)
130 {
131 pid_t pid;
132
133 /* If SIGCLD is ignored kernel_wait4 won't populate the status. */
134 kernel_sigaction(SIGCHLD, SIG_DFL);
135 pid = kernel_thread(call_usermodehelper_exec_async, sub_info, SIGCHLD);
136 if (pid < 0) {
137 sub_info->retval = pid;
138 } else {
139 int ret = -ECHILD;
140 /*
141 * Normally it is bogus to call wait4() from in-kernel because
142 * wait4() wants to write the exit code to a userspace address.
143 * But call_usermodehelper_exec_sync() always runs as kernel
144 * thread (workqueue) and put_user() to a kernel address works
145 * OK for kernel threads, due to their having an mm_segment_t
146 * which spans the entire address space.
147 *
148 * Thus the __user pointer cast is valid here.
149 */
150 kernel_wait4(pid, (int __user *)&ret, 0, NULL);
151
152 /*
153 * If ret is 0, either call_usermodehelper_exec_async failed and
154 * the real error code is already in sub_info->retval or
155 * sub_info->retval is 0 anyway, so don't mess with it then.
156 */
157 if (ret)
158 sub_info->retval = ret;
159 }
160
161 /* Restore default kernel sig handler */
162 kernel_sigaction(SIGCHLD, SIG_IGN);
163
164 umh_complete(sub_info);
165 }
166
167 /*
168 * We need to create the usermodehelper kernel thread from a task that is affine
169 * to an optimized set of CPUs (or nohz housekeeping ones) such that they
170 * inherit a widest affinity irrespective of call_usermodehelper() callers with
171 * possibly reduced affinity (eg: per-cpu workqueues). We don't want
172 * usermodehelper targets to contend a busy CPU.
173 *
174 * Unbound workqueues provide such wide affinity and allow to block on
175 * UMH_WAIT_PROC requests without blocking pending request (up to some limit).
176 *
177 * Besides, workqueues provide the privilege level that caller might not have
178 * to perform the usermodehelper request.
179 *
180 */
181 static void call_usermodehelper_exec_work(struct work_struct *work)
182 {
183 struct subprocess_info *sub_info =
184 container_of(work, struct subprocess_info, work);
185
186 if (sub_info->wait & UMH_WAIT_PROC) {
187 call_usermodehelper_exec_sync(sub_info);
188 } else {
189 pid_t pid;
190 /*
191 * Use CLONE_PARENT to reparent it to kthreadd; we do not
192 * want to pollute current->children, and we need a parent
193 * that always ignores SIGCHLD to ensure auto-reaping.
194 */
195 pid = kernel_thread(call_usermodehelper_exec_async, sub_info,
196 CLONE_PARENT | SIGCHLD);
197 if (pid < 0) {
198 sub_info->retval = pid;
199 umh_complete(sub_info);
200 }
201 }
202 }
203
204 /*
205 * If set, call_usermodehelper_exec() will exit immediately returning -EBUSY
206 * (used for preventing user land processes from being created after the user
207 * land has been frozen during a system-wide hibernation or suspend operation).
208 * Should always be manipulated under umhelper_sem acquired for write.
209 */
210 static enum umh_disable_depth usermodehelper_disabled = UMH_DISABLED;
211
212 /* Number of helpers running */
213 static atomic_t running_helpers = ATOMIC_INIT(0);
214
215 /*
216 * Wait queue head used by usermodehelper_disable() to wait for all running
217 * helpers to finish.
218 */
219 static DECLARE_WAIT_QUEUE_HEAD(running_helpers_waitq);
220
221 /*
222 * Used by usermodehelper_read_lock_wait() to wait for usermodehelper_disabled
223 * to become 'false'.
224 */
225 static DECLARE_WAIT_QUEUE_HEAD(usermodehelper_disabled_waitq);
226
227 /*
228 * Time to wait for running_helpers to become zero before the setting of
229 * usermodehelper_disabled in usermodehelper_disable() fails
230 */
231 #define RUNNING_HELPERS_TIMEOUT (5 * HZ)
232
233 int usermodehelper_read_trylock(void)
234 {
235 DEFINE_WAIT(wait);
236 int ret = 0;
237
238 down_read(&umhelper_sem);
239 for (;;) {
240 prepare_to_wait(&usermodehelper_disabled_waitq, &wait,
241 TASK_INTERRUPTIBLE);
242 if (!usermodehelper_disabled)
243 break;
244
245 if (usermodehelper_disabled == UMH_DISABLED)
246 ret = -EAGAIN;
247
248 up_read(&umhelper_sem);
249
250 if (ret)
251 break;
252
253 schedule();
254 try_to_freeze();
255
256 down_read(&umhelper_sem);
257 }
258 finish_wait(&usermodehelper_disabled_waitq, &wait);
259 return ret;
260 }
261 EXPORT_SYMBOL_GPL(usermodehelper_read_trylock);
262
263 long usermodehelper_read_lock_wait(long timeout)
264 {
265 DEFINE_WAIT(wait);
266
267 if (timeout < 0)
268 return -EINVAL;
269
270 down_read(&umhelper_sem);
271 for (;;) {
272 prepare_to_wait(&usermodehelper_disabled_waitq, &wait,
273 TASK_UNINTERRUPTIBLE);
274 if (!usermodehelper_disabled)
275 break;
276
277 up_read(&umhelper_sem);
278
279 timeout = schedule_timeout(timeout);
280 if (!timeout)
281 break;
282
283 down_read(&umhelper_sem);
284 }
285 finish_wait(&usermodehelper_disabled_waitq, &wait);
286 return timeout;
287 }
288 EXPORT_SYMBOL_GPL(usermodehelper_read_lock_wait);
289
290 void usermodehelper_read_unlock(void)
291 {
292 up_read(&umhelper_sem);
293 }
294 EXPORT_SYMBOL_GPL(usermodehelper_read_unlock);
295
296 /**
297 * __usermodehelper_set_disable_depth - Modify usermodehelper_disabled.
298 * @depth: New value to assign to usermodehelper_disabled.
299 *
300 * Change the value of usermodehelper_disabled (under umhelper_sem locked for
301 * writing) and wakeup tasks waiting for it to change.
302 */
303 void __usermodehelper_set_disable_depth(enum umh_disable_depth depth)
304 {
305 down_write(&umhelper_sem);
306 usermodehelper_disabled = depth;
307 wake_up(&usermodehelper_disabled_waitq);
308 up_write(&umhelper_sem);
309 }
310
311 /**
312 * __usermodehelper_disable - Prevent new helpers from being started.
313 * @depth: New value to assign to usermodehelper_disabled.
314 *
315 * Set usermodehelper_disabled to @depth and wait for running helpers to exit.
316 */
317 int __usermodehelper_disable(enum umh_disable_depth depth)
318 {
319 long retval;
320
321 if (!depth)
322 return -EINVAL;
323
324 down_write(&umhelper_sem);
325 usermodehelper_disabled = depth;
326 up_write(&umhelper_sem);
327
328 /*
329 * From now on call_usermodehelper_exec() won't start any new
330 * helpers, so it is sufficient if running_helpers turns out to
331 * be zero at one point (it may be increased later, but that
332 * doesn't matter).
333 */
334 retval = wait_event_timeout(running_helpers_waitq,
335 atomic_read(&running_helpers) == 0,
336 RUNNING_HELPERS_TIMEOUT);
337 if (retval)
338 return 0;
339
340 __usermodehelper_set_disable_depth(UMH_ENABLED);
341 return -EAGAIN;
342 }
343
344 static void helper_lock(void)
345 {
346 atomic_inc(&running_helpers);
347 smp_mb__after_atomic();
348 }
349
350 static void helper_unlock(void)
351 {
352 if (atomic_dec_and_test(&running_helpers))
353 wake_up(&running_helpers_waitq);
354 }
355
356 /**
357 * call_usermodehelper_setup - prepare to call a usermode helper
358 * @path: path to usermode executable
359 * @argv: arg vector for process
360 * @envp: environment for process
361 * @gfp_mask: gfp mask for memory allocation
362 * @cleanup: a cleanup function
363 * @init: an init function
364 * @data: arbitrary context sensitive data
365 *
366 * Returns either %NULL on allocation failure, or a subprocess_info
367 * structure. This should be passed to call_usermodehelper_exec to
368 * exec the process and free the structure.
369 *
370 * The init function is used to customize the helper process prior to
371 * exec. A non-zero return code causes the process to error out, exit,
372 * and return the failure to the calling process
373 *
374 * The cleanup function is just before ethe subprocess_info is about to
375 * be freed. This can be used for freeing the argv and envp. The
376 * Function must be runnable in either a process context or the
377 * context in which call_usermodehelper_exec is called.
378 */
379 struct subprocess_info *call_usermodehelper_setup(const char *path, char **argv,
380 char **envp, gfp_t gfp_mask,
381 int (*init)(struct subprocess_info *info, struct cred *new),
382 void (*cleanup)(struct subprocess_info *info),
383 void *data)
384 {
385 struct subprocess_info *sub_info;
386 sub_info = kzalloc(sizeof(struct subprocess_info), gfp_mask);
387 if (!sub_info)
388 goto out;
389
390 INIT_WORK(&sub_info->work, call_usermodehelper_exec_work);
391
392 #ifdef CONFIG_STATIC_USERMODEHELPER
393 sub_info->path = CONFIG_STATIC_USERMODEHELPER_PATH;
394 #else
395 sub_info->path = path;
396 #endif
397 sub_info->argv = argv;
398 sub_info->envp = envp;
399
400 sub_info->cleanup = cleanup;
401 sub_info->init = init;
402 sub_info->data = data;
403 out:
404 return sub_info;
405 }
406 EXPORT_SYMBOL(call_usermodehelper_setup);
407
408 struct subprocess_info *call_usermodehelper_setup_file(struct file *file,
409 int (*init)(struct subprocess_info *info, struct cred *new),
410 void (*cleanup)(struct subprocess_info *info), void *data)
411 {
412 struct subprocess_info *sub_info;
413 struct umh_info *info = data;
414 const char *cmdline = (info->cmdline) ? info->cmdline : "usermodehelper";
415
416 sub_info = kzalloc(sizeof(struct subprocess_info), GFP_KERNEL);
417 if (!sub_info)
418 return NULL;
419
420 sub_info->argv = argv_split(GFP_KERNEL, cmdline, NULL);
421 if (!sub_info->argv) {
422 kfree(sub_info);
423 return NULL;
424 }
425
426 INIT_WORK(&sub_info->work, call_usermodehelper_exec_work);
427 sub_info->path = "none";
428 sub_info->file = file;
429 sub_info->init = init;
430 sub_info->cleanup = cleanup;
431 sub_info->data = data;
432 return sub_info;
433 }
434
435 static int umh_pipe_setup(struct subprocess_info *info, struct cred *new)
436 {
437 struct umh_info *umh_info = info->data;
438 struct file *from_umh[2];
439 struct file *to_umh[2];
440 int err;
441
442 /* create pipe to send data to umh */
443 err = create_pipe_files(to_umh, 0);
444 if (err)
445 return err;
446 err = replace_fd(0, to_umh[0], 0);
447 fput(to_umh[0]);
448 if (err < 0) {
449 fput(to_umh[1]);
450 return err;
451 }
452
453 /* create pipe to receive data from umh */
454 err = create_pipe_files(from_umh, 0);
455 if (err) {
456 fput(to_umh[1]);
457 replace_fd(0, NULL, 0);
458 return err;
459 }
460 err = replace_fd(1, from_umh[1], 0);
461 fput(from_umh[1]);
462 if (err < 0) {
463 fput(to_umh[1]);
464 replace_fd(0, NULL, 0);
465 fput(from_umh[0]);
466 return err;
467 }
468
469 umh_info->pipe_to_umh = to_umh[1];
470 umh_info->pipe_from_umh = from_umh[0];
471 return 0;
472 }
473
474 static void umh_clean_and_save_pid(struct subprocess_info *info)
475 {
476 struct umh_info *umh_info = info->data;
477
478 /* cleanup if umh_pipe_setup() was successful but exec failed */
479 if (info->pid && info->retval) {
480 fput(umh_info->pipe_to_umh);
481 fput(umh_info->pipe_from_umh);
482 }
483
484 argv_free(info->argv);
485 umh_info->pid = info->pid;
486 }
487
488 /**
489 * fork_usermode_blob - fork a blob of bytes as a usermode process
490 * @data: a blob of bytes that can be do_execv-ed as a file
491 * @len: length of the blob
492 * @info: information about usermode process (shouldn't be NULL)
493 *
494 * If info->cmdline is set it will be used as command line for the
495 * user process, else "usermodehelper" is used.
496 *
497 * Returns either negative error or zero which indicates success
498 * in executing a blob of bytes as a usermode process. In such
499 * case 'struct umh_info *info' is populated with two pipes
500 * and a pid of the process. The caller is responsible for health
501 * check of the user process, killing it via pid, and closing the
502 * pipes when user process is no longer needed.
503 */
504 int fork_usermode_blob(void *data, size_t len, struct umh_info *info)
505 {
506 struct subprocess_info *sub_info;
507 struct file *file;
508 ssize_t written;
509 loff_t pos = 0;
510 int err;
511
512 file = shmem_kernel_file_setup("", len, 0);
513 if (IS_ERR(file))
514 return PTR_ERR(file);
515
516 written = kernel_write(file, data, len, &pos);
517 if (written != len) {
518 err = written;
519 if (err >= 0)
520 err = -ENOMEM;
521 goto out;
522 }
523
524 err = -ENOMEM;
525 sub_info = call_usermodehelper_setup_file(file, umh_pipe_setup,
526 umh_clean_and_save_pid, info);
527 if (!sub_info)
528 goto out;
529
530 err = call_usermodehelper_exec(sub_info, UMH_WAIT_EXEC);
531 if (!err) {
532 mutex_lock(&umh_list_lock);
533 list_add(&info->list, &umh_list);
534 mutex_unlock(&umh_list_lock);
535 }
536 out:
537 fput(file);
538 return err;
539 }
540 EXPORT_SYMBOL_GPL(fork_usermode_blob);
541
542 /**
543 * call_usermodehelper_exec - start a usermode application
544 * @sub_info: information about the subprocessa
545 * @wait: wait for the application to finish and return status.
546 * when UMH_NO_WAIT don't wait at all, but you get no useful error back
547 * when the program couldn't be exec'ed. This makes it safe to call
548 * from interrupt context.
549 *
550 * Runs a user-space application. The application is started
551 * asynchronously if wait is not set, and runs as a child of system workqueues.
552 * (ie. it runs with full root capabilities and optimized affinity).
553 *
554 * Note: successful return value does not guarantee the helper was called at
555 * all. You can't rely on sub_info->{init,cleanup} being called even for
556 * UMH_WAIT_* wait modes as STATIC_USERMODEHELPER_PATH="" turns all helpers
557 * into a successful no-op.
558 */
559 int call_usermodehelper_exec(struct subprocess_info *sub_info, int wait)
560 {
561 DECLARE_COMPLETION_ONSTACK(done);
562 int retval = 0;
563
564 if (!sub_info->path) {
565 call_usermodehelper_freeinfo(sub_info);
566 return -EINVAL;
567 }
568 helper_lock();
569 if (usermodehelper_disabled) {
570 retval = -EBUSY;
571 goto out;
572 }
573
574 /*
575 * If there is no binary for us to call, then just return and get out of
576 * here. This allows us to set STATIC_USERMODEHELPER_PATH to "" and
577 * disable all call_usermodehelper() calls.
578 */
579 if (strlen(sub_info->path) == 0)
580 goto out;
581
582 /*
583 * Set the completion pointer only if there is a waiter.
584 * This makes it possible to use umh_complete to free
585 * the data structure in case of UMH_NO_WAIT.
586 */
587 sub_info->complete = (wait == UMH_NO_WAIT) ? NULL : &done;
588 sub_info->wait = wait;
589
590 queue_work(system_unbound_wq, &sub_info->work);
591 if (wait == UMH_NO_WAIT) /* task has freed sub_info */
592 goto unlock;
593
594 if (wait & UMH_KILLABLE) {
595 retval = wait_for_completion_killable(&done);
596 if (!retval)
597 goto wait_done;
598
599 /* umh_complete() will see NULL and free sub_info */
600 if (xchg(&sub_info->complete, NULL))
601 goto unlock;
602 /* fallthrough, umh_complete() was already called */
603 }
604
605 wait_for_completion(&done);
606 wait_done:
607 retval = sub_info->retval;
608 out:
609 call_usermodehelper_freeinfo(sub_info);
610 unlock:
611 helper_unlock();
612 return retval;
613 }
614 EXPORT_SYMBOL(call_usermodehelper_exec);
615
616 /**
617 * call_usermodehelper() - prepare and start a usermode application
618 * @path: path to usermode executable
619 * @argv: arg vector for process
620 * @envp: environment for process
621 * @wait: wait for the application to finish and return status.
622 * when UMH_NO_WAIT don't wait at all, but you get no useful error back
623 * when the program couldn't be exec'ed. This makes it safe to call
624 * from interrupt context.
625 *
626 * This function is the equivalent to use call_usermodehelper_setup() and
627 * call_usermodehelper_exec().
628 */
629 int call_usermodehelper(const char *path, char **argv, char **envp, int wait)
630 {
631 struct subprocess_info *info;
632 gfp_t gfp_mask = (wait == UMH_NO_WAIT) ? GFP_ATOMIC : GFP_KERNEL;
633
634 info = call_usermodehelper_setup(path, argv, envp, gfp_mask,
635 NULL, NULL, NULL);
636 if (info == NULL)
637 return -ENOMEM;
638
639 return call_usermodehelper_exec(info, wait);
640 }
641 EXPORT_SYMBOL(call_usermodehelper);
642
643 static int proc_cap_handler(struct ctl_table *table, int write,
644 void *buffer, size_t *lenp, loff_t *ppos)
645 {
646 struct ctl_table t;
647 unsigned long cap_array[_KERNEL_CAPABILITY_U32S];
648 kernel_cap_t new_cap;
649 int err, i;
650
651 if (write && (!capable(CAP_SETPCAP) ||
652 !capable(CAP_SYS_MODULE)))
653 return -EPERM;
654
655 /*
656 * convert from the global kernel_cap_t to the ulong array to print to
657 * userspace if this is a read.
658 */
659 spin_lock(&umh_sysctl_lock);
660 for (i = 0; i < _KERNEL_CAPABILITY_U32S; i++) {
661 if (table->data == CAP_BSET)
662 cap_array[i] = usermodehelper_bset.cap[i];
663 else if (table->data == CAP_PI)
664 cap_array[i] = usermodehelper_inheritable.cap[i];
665 else
666 BUG();
667 }
668 spin_unlock(&umh_sysctl_lock);
669
670 t = *table;
671 t.data = &cap_array;
672
673 /*
674 * actually read or write and array of ulongs from userspace. Remember
675 * these are least significant 32 bits first
676 */
677 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
678 if (err < 0)
679 return err;
680
681 /*
682 * convert from the sysctl array of ulongs to the kernel_cap_t
683 * internal representation
684 */
685 for (i = 0; i < _KERNEL_CAPABILITY_U32S; i++)
686 new_cap.cap[i] = cap_array[i];
687
688 /*
689 * Drop everything not in the new_cap (but don't add things)
690 */
691 if (write) {
692 spin_lock(&umh_sysctl_lock);
693 if (table->data == CAP_BSET)
694 usermodehelper_bset = cap_intersect(usermodehelper_bset, new_cap);
695 if (table->data == CAP_PI)
696 usermodehelper_inheritable = cap_intersect(usermodehelper_inheritable, new_cap);
697 spin_unlock(&umh_sysctl_lock);
698 }
699
700 return 0;
701 }
702
703 void __exit_umh(struct task_struct *tsk)
704 {
705 struct umh_info *info;
706 pid_t pid = tsk->pid;
707
708 mutex_lock(&umh_list_lock);
709 list_for_each_entry(info, &umh_list, list) {
710 if (info->pid == pid) {
711 list_del(&info->list);
712 mutex_unlock(&umh_list_lock);
713 goto out;
714 }
715 }
716 mutex_unlock(&umh_list_lock);
717 return;
718 out:
719 if (info->cleanup)
720 info->cleanup(info);
721 }
722
723 struct ctl_table usermodehelper_table[] = {
724 {
725 .procname = "bset",
726 .data = CAP_BSET,
727 .maxlen = _KERNEL_CAPABILITY_U32S * sizeof(unsigned long),
728 .mode = 0600,
729 .proc_handler = proc_cap_handler,
730 },
731 {
732 .procname = "inheritable",
733 .data = CAP_PI,
734 .maxlen = _KERNEL_CAPABILITY_U32S * sizeof(unsigned long),
735 .mode = 0600,
736 .proc_handler = proc_cap_handler,
737 },
738 { }
739 };