xref: /openbmc/linux/kernel/sysctl.c (revision d2999e1b)
1 /*
2  * sysctl.c: General linux system control interface
3  *
4  * Begun 24 March 1995, Stephen Tweedie
5  * Added /proc support, Dec 1995
6  * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
7  * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
8  * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
9  * Dynamic registration fixes, Stephen Tweedie.
10  * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
11  * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
12  *  Horn.
13  * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
14  * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
15  * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
16  *  Wendling.
17  * The list_for_each() macro wasn't appropriate for the sysctl loop.
18  *  Removed it and replaced it with older style, 03/23/00, Bill Wendling
19  */
20 
21 #include <linux/module.h>
22 #include <linux/mm.h>
23 #include <linux/swap.h>
24 #include <linux/slab.h>
25 #include <linux/sysctl.h>
26 #include <linux/bitmap.h>
27 #include <linux/signal.h>
28 #include <linux/printk.h>
29 #include <linux/proc_fs.h>
30 #include <linux/security.h>
31 #include <linux/ctype.h>
32 #include <linux/kmemcheck.h>
33 #include <linux/kmemleak.h>
34 #include <linux/fs.h>
35 #include <linux/init.h>
36 #include <linux/kernel.h>
37 #include <linux/kobject.h>
38 #include <linux/net.h>
39 #include <linux/sysrq.h>
40 #include <linux/highuid.h>
41 #include <linux/writeback.h>
42 #include <linux/ratelimit.h>
43 #include <linux/compaction.h>
44 #include <linux/hugetlb.h>
45 #include <linux/initrd.h>
46 #include <linux/key.h>
47 #include <linux/times.h>
48 #include <linux/limits.h>
49 #include <linux/dcache.h>
50 #include <linux/dnotify.h>
51 #include <linux/syscalls.h>
52 #include <linux/vmstat.h>
53 #include <linux/nfs_fs.h>
54 #include <linux/acpi.h>
55 #include <linux/reboot.h>
56 #include <linux/ftrace.h>
57 #include <linux/perf_event.h>
58 #include <linux/kprobes.h>
59 #include <linux/pipe_fs_i.h>
60 #include <linux/oom.h>
61 #include <linux/kmod.h>
62 #include <linux/capability.h>
63 #include <linux/binfmts.h>
64 #include <linux/sched/sysctl.h>
65 #include <linux/kexec.h>
66 
67 #include <asm/uaccess.h>
68 #include <asm/processor.h>
69 
70 #ifdef CONFIG_X86
71 #include <asm/nmi.h>
72 #include <asm/stacktrace.h>
73 #include <asm/io.h>
74 #endif
75 #ifdef CONFIG_SPARC
76 #include <asm/setup.h>
77 #endif
78 #ifdef CONFIG_BSD_PROCESS_ACCT
79 #include <linux/acct.h>
80 #endif
81 #ifdef CONFIG_RT_MUTEXES
82 #include <linux/rtmutex.h>
83 #endif
84 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
85 #include <linux/lockdep.h>
86 #endif
87 #ifdef CONFIG_CHR_DEV_SG
88 #include <scsi/sg.h>
89 #endif
90 
91 #ifdef CONFIG_LOCKUP_DETECTOR
92 #include <linux/nmi.h>
93 #endif
94 
95 
96 #if defined(CONFIG_SYSCTL)
97 
98 /* External variables not in a header file. */
99 extern int max_threads;
100 extern int suid_dumpable;
101 #ifdef CONFIG_COREDUMP
102 extern int core_uses_pid;
103 extern char core_pattern[];
104 extern unsigned int core_pipe_limit;
105 #endif
106 extern int pid_max;
107 extern int pid_max_min, pid_max_max;
108 extern int percpu_pagelist_fraction;
109 extern int compat_log;
110 extern int latencytop_enabled;
111 extern int sysctl_nr_open_min, sysctl_nr_open_max;
112 #ifndef CONFIG_MMU
113 extern int sysctl_nr_trim_pages;
114 #endif
115 
116 /* Constants used for minimum and  maximum */
117 #ifdef CONFIG_LOCKUP_DETECTOR
118 static int sixty = 60;
119 #endif
120 
121 static int __maybe_unused neg_one = -1;
122 
123 static int zero;
124 static int __maybe_unused one = 1;
125 static int __maybe_unused two = 2;
126 static int __maybe_unused four = 4;
127 static unsigned long one_ul = 1;
128 static int one_hundred = 100;
129 #ifdef CONFIG_PRINTK
130 static int ten_thousand = 10000;
131 #endif
132 
133 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
134 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
135 
136 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
137 static int maxolduid = 65535;
138 static int minolduid;
139 
140 static int ngroups_max = NGROUPS_MAX;
141 static const int cap_last_cap = CAP_LAST_CAP;
142 
143 /*this is needed for proc_doulongvec_minmax of sysctl_hung_task_timeout_secs */
144 #ifdef CONFIG_DETECT_HUNG_TASK
145 static unsigned long hung_task_timeout_max = (LONG_MAX/HZ);
146 #endif
147 
148 #ifdef CONFIG_INOTIFY_USER
149 #include <linux/inotify.h>
150 #endif
151 #ifdef CONFIG_SPARC
152 #endif
153 
154 #ifdef __hppa__
155 extern int pwrsw_enabled;
156 #endif
157 
158 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
159 extern int unaligned_enabled;
160 #endif
161 
162 #ifdef CONFIG_IA64
163 extern int unaligned_dump_stack;
164 #endif
165 
166 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
167 extern int no_unaligned_warning;
168 #endif
169 
170 #ifdef CONFIG_PROC_SYSCTL
171 
172 #define SYSCTL_WRITES_LEGACY	-1
173 #define SYSCTL_WRITES_WARN	 0
174 #define SYSCTL_WRITES_STRICT	 1
175 
176 static int sysctl_writes_strict = SYSCTL_WRITES_WARN;
177 
178 static int proc_do_cad_pid(struct ctl_table *table, int write,
179 		  void __user *buffer, size_t *lenp, loff_t *ppos);
180 static int proc_taint(struct ctl_table *table, int write,
181 			       void __user *buffer, size_t *lenp, loff_t *ppos);
182 #endif
183 
184 #ifdef CONFIG_PRINTK
185 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
186 				void __user *buffer, size_t *lenp, loff_t *ppos);
187 #endif
188 
189 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
190 		void __user *buffer, size_t *lenp, loff_t *ppos);
191 #ifdef CONFIG_COREDUMP
192 static int proc_dostring_coredump(struct ctl_table *table, int write,
193 		void __user *buffer, size_t *lenp, loff_t *ppos);
194 #endif
195 
196 #ifdef CONFIG_MAGIC_SYSRQ
197 /* Note: sysrq code uses it's own private copy */
198 static int __sysrq_enabled = CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE;
199 
200 static int sysrq_sysctl_handler(struct ctl_table *table, int write,
201 				void __user *buffer, size_t *lenp,
202 				loff_t *ppos)
203 {
204 	int error;
205 
206 	error = proc_dointvec(table, write, buffer, lenp, ppos);
207 	if (error)
208 		return error;
209 
210 	if (write)
211 		sysrq_toggle_support(__sysrq_enabled);
212 
213 	return 0;
214 }
215 
216 #endif
217 
218 static struct ctl_table kern_table[];
219 static struct ctl_table vm_table[];
220 static struct ctl_table fs_table[];
221 static struct ctl_table debug_table[];
222 static struct ctl_table dev_table[];
223 extern struct ctl_table random_table[];
224 #ifdef CONFIG_EPOLL
225 extern struct ctl_table epoll_table[];
226 #endif
227 
228 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
229 int sysctl_legacy_va_layout;
230 #endif
231 
232 /* The default sysctl tables: */
233 
234 static struct ctl_table sysctl_base_table[] = {
235 	{
236 		.procname	= "kernel",
237 		.mode		= 0555,
238 		.child		= kern_table,
239 	},
240 	{
241 		.procname	= "vm",
242 		.mode		= 0555,
243 		.child		= vm_table,
244 	},
245 	{
246 		.procname	= "fs",
247 		.mode		= 0555,
248 		.child		= fs_table,
249 	},
250 	{
251 		.procname	= "debug",
252 		.mode		= 0555,
253 		.child		= debug_table,
254 	},
255 	{
256 		.procname	= "dev",
257 		.mode		= 0555,
258 		.child		= dev_table,
259 	},
260 	{ }
261 };
262 
263 #ifdef CONFIG_SCHED_DEBUG
264 static int min_sched_granularity_ns = 100000;		/* 100 usecs */
265 static int max_sched_granularity_ns = NSEC_PER_SEC;	/* 1 second */
266 static int min_wakeup_granularity_ns;			/* 0 usecs */
267 static int max_wakeup_granularity_ns = NSEC_PER_SEC;	/* 1 second */
268 #ifdef CONFIG_SMP
269 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
270 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
271 #endif /* CONFIG_SMP */
272 #endif /* CONFIG_SCHED_DEBUG */
273 
274 #ifdef CONFIG_COMPACTION
275 static int min_extfrag_threshold;
276 static int max_extfrag_threshold = 1000;
277 #endif
278 
279 static struct ctl_table kern_table[] = {
280 	{
281 		.procname	= "sched_child_runs_first",
282 		.data		= &sysctl_sched_child_runs_first,
283 		.maxlen		= sizeof(unsigned int),
284 		.mode		= 0644,
285 		.proc_handler	= proc_dointvec,
286 	},
287 #ifdef CONFIG_SCHED_DEBUG
288 	{
289 		.procname	= "sched_min_granularity_ns",
290 		.data		= &sysctl_sched_min_granularity,
291 		.maxlen		= sizeof(unsigned int),
292 		.mode		= 0644,
293 		.proc_handler	= sched_proc_update_handler,
294 		.extra1		= &min_sched_granularity_ns,
295 		.extra2		= &max_sched_granularity_ns,
296 	},
297 	{
298 		.procname	= "sched_latency_ns",
299 		.data		= &sysctl_sched_latency,
300 		.maxlen		= sizeof(unsigned int),
301 		.mode		= 0644,
302 		.proc_handler	= sched_proc_update_handler,
303 		.extra1		= &min_sched_granularity_ns,
304 		.extra2		= &max_sched_granularity_ns,
305 	},
306 	{
307 		.procname	= "sched_wakeup_granularity_ns",
308 		.data		= &sysctl_sched_wakeup_granularity,
309 		.maxlen		= sizeof(unsigned int),
310 		.mode		= 0644,
311 		.proc_handler	= sched_proc_update_handler,
312 		.extra1		= &min_wakeup_granularity_ns,
313 		.extra2		= &max_wakeup_granularity_ns,
314 	},
315 #ifdef CONFIG_SMP
316 	{
317 		.procname	= "sched_tunable_scaling",
318 		.data		= &sysctl_sched_tunable_scaling,
319 		.maxlen		= sizeof(enum sched_tunable_scaling),
320 		.mode		= 0644,
321 		.proc_handler	= sched_proc_update_handler,
322 		.extra1		= &min_sched_tunable_scaling,
323 		.extra2		= &max_sched_tunable_scaling,
324 	},
325 	{
326 		.procname	= "sched_migration_cost_ns",
327 		.data		= &sysctl_sched_migration_cost,
328 		.maxlen		= sizeof(unsigned int),
329 		.mode		= 0644,
330 		.proc_handler	= proc_dointvec,
331 	},
332 	{
333 		.procname	= "sched_nr_migrate",
334 		.data		= &sysctl_sched_nr_migrate,
335 		.maxlen		= sizeof(unsigned int),
336 		.mode		= 0644,
337 		.proc_handler	= proc_dointvec,
338 	},
339 	{
340 		.procname	= "sched_time_avg_ms",
341 		.data		= &sysctl_sched_time_avg,
342 		.maxlen		= sizeof(unsigned int),
343 		.mode		= 0644,
344 		.proc_handler	= proc_dointvec,
345 	},
346 	{
347 		.procname	= "sched_shares_window_ns",
348 		.data		= &sysctl_sched_shares_window,
349 		.maxlen		= sizeof(unsigned int),
350 		.mode		= 0644,
351 		.proc_handler	= proc_dointvec,
352 	},
353 	{
354 		.procname	= "timer_migration",
355 		.data		= &sysctl_timer_migration,
356 		.maxlen		= sizeof(unsigned int),
357 		.mode		= 0644,
358 		.proc_handler	= proc_dointvec_minmax,
359 		.extra1		= &zero,
360 		.extra2		= &one,
361 	},
362 #endif /* CONFIG_SMP */
363 #ifdef CONFIG_NUMA_BALANCING
364 	{
365 		.procname	= "numa_balancing_scan_delay_ms",
366 		.data		= &sysctl_numa_balancing_scan_delay,
367 		.maxlen		= sizeof(unsigned int),
368 		.mode		= 0644,
369 		.proc_handler	= proc_dointvec,
370 	},
371 	{
372 		.procname	= "numa_balancing_scan_period_min_ms",
373 		.data		= &sysctl_numa_balancing_scan_period_min,
374 		.maxlen		= sizeof(unsigned int),
375 		.mode		= 0644,
376 		.proc_handler	= proc_dointvec,
377 	},
378 	{
379 		.procname	= "numa_balancing_scan_period_max_ms",
380 		.data		= &sysctl_numa_balancing_scan_period_max,
381 		.maxlen		= sizeof(unsigned int),
382 		.mode		= 0644,
383 		.proc_handler	= proc_dointvec,
384 	},
385 	{
386 		.procname	= "numa_balancing_scan_size_mb",
387 		.data		= &sysctl_numa_balancing_scan_size,
388 		.maxlen		= sizeof(unsigned int),
389 		.mode		= 0644,
390 		.proc_handler	= proc_dointvec,
391 	},
392 	{
393 		.procname	= "numa_balancing",
394 		.data		= NULL, /* filled in by handler */
395 		.maxlen		= sizeof(unsigned int),
396 		.mode		= 0644,
397 		.proc_handler	= sysctl_numa_balancing,
398 		.extra1		= &zero,
399 		.extra2		= &one,
400 	},
401 #endif /* CONFIG_NUMA_BALANCING */
402 #endif /* CONFIG_SCHED_DEBUG */
403 	{
404 		.procname	= "sched_rt_period_us",
405 		.data		= &sysctl_sched_rt_period,
406 		.maxlen		= sizeof(unsigned int),
407 		.mode		= 0644,
408 		.proc_handler	= sched_rt_handler,
409 	},
410 	{
411 		.procname	= "sched_rt_runtime_us",
412 		.data		= &sysctl_sched_rt_runtime,
413 		.maxlen		= sizeof(int),
414 		.mode		= 0644,
415 		.proc_handler	= sched_rt_handler,
416 	},
417 	{
418 		.procname	= "sched_rr_timeslice_ms",
419 		.data		= &sched_rr_timeslice,
420 		.maxlen		= sizeof(int),
421 		.mode		= 0644,
422 		.proc_handler	= sched_rr_handler,
423 	},
424 #ifdef CONFIG_SCHED_AUTOGROUP
425 	{
426 		.procname	= "sched_autogroup_enabled",
427 		.data		= &sysctl_sched_autogroup_enabled,
428 		.maxlen		= sizeof(unsigned int),
429 		.mode		= 0644,
430 		.proc_handler	= proc_dointvec_minmax,
431 		.extra1		= &zero,
432 		.extra2		= &one,
433 	},
434 #endif
435 #ifdef CONFIG_CFS_BANDWIDTH
436 	{
437 		.procname	= "sched_cfs_bandwidth_slice_us",
438 		.data		= &sysctl_sched_cfs_bandwidth_slice,
439 		.maxlen		= sizeof(unsigned int),
440 		.mode		= 0644,
441 		.proc_handler	= proc_dointvec_minmax,
442 		.extra1		= &one,
443 	},
444 #endif
445 #ifdef CONFIG_PROVE_LOCKING
446 	{
447 		.procname	= "prove_locking",
448 		.data		= &prove_locking,
449 		.maxlen		= sizeof(int),
450 		.mode		= 0644,
451 		.proc_handler	= proc_dointvec,
452 	},
453 #endif
454 #ifdef CONFIG_LOCK_STAT
455 	{
456 		.procname	= "lock_stat",
457 		.data		= &lock_stat,
458 		.maxlen		= sizeof(int),
459 		.mode		= 0644,
460 		.proc_handler	= proc_dointvec,
461 	},
462 #endif
463 	{
464 		.procname	= "panic",
465 		.data		= &panic_timeout,
466 		.maxlen		= sizeof(int),
467 		.mode		= 0644,
468 		.proc_handler	= proc_dointvec,
469 	},
470 #ifdef CONFIG_COREDUMP
471 	{
472 		.procname	= "core_uses_pid",
473 		.data		= &core_uses_pid,
474 		.maxlen		= sizeof(int),
475 		.mode		= 0644,
476 		.proc_handler	= proc_dointvec,
477 	},
478 	{
479 		.procname	= "core_pattern",
480 		.data		= core_pattern,
481 		.maxlen		= CORENAME_MAX_SIZE,
482 		.mode		= 0644,
483 		.proc_handler	= proc_dostring_coredump,
484 	},
485 	{
486 		.procname	= "core_pipe_limit",
487 		.data		= &core_pipe_limit,
488 		.maxlen		= sizeof(unsigned int),
489 		.mode		= 0644,
490 		.proc_handler	= proc_dointvec,
491 	},
492 #endif
493 #ifdef CONFIG_PROC_SYSCTL
494 	{
495 		.procname	= "tainted",
496 		.maxlen 	= sizeof(long),
497 		.mode		= 0644,
498 		.proc_handler	= proc_taint,
499 	},
500 	{
501 		.procname	= "sysctl_writes_strict",
502 		.data		= &sysctl_writes_strict,
503 		.maxlen		= sizeof(int),
504 		.mode		= 0644,
505 		.proc_handler	= proc_dointvec_minmax,
506 		.extra1		= &neg_one,
507 		.extra2		= &one,
508 	},
509 #endif
510 #ifdef CONFIG_LATENCYTOP
511 	{
512 		.procname	= "latencytop",
513 		.data		= &latencytop_enabled,
514 		.maxlen		= sizeof(int),
515 		.mode		= 0644,
516 		.proc_handler	= proc_dointvec,
517 	},
518 #endif
519 #ifdef CONFIG_BLK_DEV_INITRD
520 	{
521 		.procname	= "real-root-dev",
522 		.data		= &real_root_dev,
523 		.maxlen		= sizeof(int),
524 		.mode		= 0644,
525 		.proc_handler	= proc_dointvec,
526 	},
527 #endif
528 	{
529 		.procname	= "print-fatal-signals",
530 		.data		= &print_fatal_signals,
531 		.maxlen		= sizeof(int),
532 		.mode		= 0644,
533 		.proc_handler	= proc_dointvec,
534 	},
535 #ifdef CONFIG_SPARC
536 	{
537 		.procname	= "reboot-cmd",
538 		.data		= reboot_command,
539 		.maxlen		= 256,
540 		.mode		= 0644,
541 		.proc_handler	= proc_dostring,
542 	},
543 	{
544 		.procname	= "stop-a",
545 		.data		= &stop_a_enabled,
546 		.maxlen		= sizeof (int),
547 		.mode		= 0644,
548 		.proc_handler	= proc_dointvec,
549 	},
550 	{
551 		.procname	= "scons-poweroff",
552 		.data		= &scons_pwroff,
553 		.maxlen		= sizeof (int),
554 		.mode		= 0644,
555 		.proc_handler	= proc_dointvec,
556 	},
557 #endif
558 #ifdef CONFIG_SPARC64
559 	{
560 		.procname	= "tsb-ratio",
561 		.data		= &sysctl_tsb_ratio,
562 		.maxlen		= sizeof (int),
563 		.mode		= 0644,
564 		.proc_handler	= proc_dointvec,
565 	},
566 #endif
567 #ifdef __hppa__
568 	{
569 		.procname	= "soft-power",
570 		.data		= &pwrsw_enabled,
571 		.maxlen		= sizeof (int),
572 	 	.mode		= 0644,
573 		.proc_handler	= proc_dointvec,
574 	},
575 #endif
576 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
577 	{
578 		.procname	= "unaligned-trap",
579 		.data		= &unaligned_enabled,
580 		.maxlen		= sizeof (int),
581 		.mode		= 0644,
582 		.proc_handler	= proc_dointvec,
583 	},
584 #endif
585 	{
586 		.procname	= "ctrl-alt-del",
587 		.data		= &C_A_D,
588 		.maxlen		= sizeof(int),
589 		.mode		= 0644,
590 		.proc_handler	= proc_dointvec,
591 	},
592 #ifdef CONFIG_FUNCTION_TRACER
593 	{
594 		.procname	= "ftrace_enabled",
595 		.data		= &ftrace_enabled,
596 		.maxlen		= sizeof(int),
597 		.mode		= 0644,
598 		.proc_handler	= ftrace_enable_sysctl,
599 	},
600 #endif
601 #ifdef CONFIG_STACK_TRACER
602 	{
603 		.procname	= "stack_tracer_enabled",
604 		.data		= &stack_tracer_enabled,
605 		.maxlen		= sizeof(int),
606 		.mode		= 0644,
607 		.proc_handler	= stack_trace_sysctl,
608 	},
609 #endif
610 #ifdef CONFIG_TRACING
611 	{
612 		.procname	= "ftrace_dump_on_oops",
613 		.data		= &ftrace_dump_on_oops,
614 		.maxlen		= sizeof(int),
615 		.mode		= 0644,
616 		.proc_handler	= proc_dointvec,
617 	},
618 	{
619 		.procname	= "traceoff_on_warning",
620 		.data		= &__disable_trace_on_warning,
621 		.maxlen		= sizeof(__disable_trace_on_warning),
622 		.mode		= 0644,
623 		.proc_handler	= proc_dointvec,
624 	},
625 #endif
626 #ifdef CONFIG_KEXEC
627 	{
628 		.procname	= "kexec_load_disabled",
629 		.data		= &kexec_load_disabled,
630 		.maxlen		= sizeof(int),
631 		.mode		= 0644,
632 		/* only handle a transition from default "0" to "1" */
633 		.proc_handler	= proc_dointvec_minmax,
634 		.extra1		= &one,
635 		.extra2		= &one,
636 	},
637 #endif
638 #ifdef CONFIG_MODULES
639 	{
640 		.procname	= "modprobe",
641 		.data		= &modprobe_path,
642 		.maxlen		= KMOD_PATH_LEN,
643 		.mode		= 0644,
644 		.proc_handler	= proc_dostring,
645 	},
646 	{
647 		.procname	= "modules_disabled",
648 		.data		= &modules_disabled,
649 		.maxlen		= sizeof(int),
650 		.mode		= 0644,
651 		/* only handle a transition from default "0" to "1" */
652 		.proc_handler	= proc_dointvec_minmax,
653 		.extra1		= &one,
654 		.extra2		= &one,
655 	},
656 #endif
657 #ifdef CONFIG_UEVENT_HELPER
658 	{
659 		.procname	= "hotplug",
660 		.data		= &uevent_helper,
661 		.maxlen		= UEVENT_HELPER_PATH_LEN,
662 		.mode		= 0644,
663 		.proc_handler	= proc_dostring,
664 	},
665 #endif
666 #ifdef CONFIG_CHR_DEV_SG
667 	{
668 		.procname	= "sg-big-buff",
669 		.data		= &sg_big_buff,
670 		.maxlen		= sizeof (int),
671 		.mode		= 0444,
672 		.proc_handler	= proc_dointvec,
673 	},
674 #endif
675 #ifdef CONFIG_BSD_PROCESS_ACCT
676 	{
677 		.procname	= "acct",
678 		.data		= &acct_parm,
679 		.maxlen		= 3*sizeof(int),
680 		.mode		= 0644,
681 		.proc_handler	= proc_dointvec,
682 	},
683 #endif
684 #ifdef CONFIG_MAGIC_SYSRQ
685 	{
686 		.procname	= "sysrq",
687 		.data		= &__sysrq_enabled,
688 		.maxlen		= sizeof (int),
689 		.mode		= 0644,
690 		.proc_handler	= sysrq_sysctl_handler,
691 	},
692 #endif
693 #ifdef CONFIG_PROC_SYSCTL
694 	{
695 		.procname	= "cad_pid",
696 		.data		= NULL,
697 		.maxlen		= sizeof (int),
698 		.mode		= 0600,
699 		.proc_handler	= proc_do_cad_pid,
700 	},
701 #endif
702 	{
703 		.procname	= "threads-max",
704 		.data		= &max_threads,
705 		.maxlen		= sizeof(int),
706 		.mode		= 0644,
707 		.proc_handler	= proc_dointvec,
708 	},
709 	{
710 		.procname	= "random",
711 		.mode		= 0555,
712 		.child		= random_table,
713 	},
714 	{
715 		.procname	= "usermodehelper",
716 		.mode		= 0555,
717 		.child		= usermodehelper_table,
718 	},
719 	{
720 		.procname	= "overflowuid",
721 		.data		= &overflowuid,
722 		.maxlen		= sizeof(int),
723 		.mode		= 0644,
724 		.proc_handler	= proc_dointvec_minmax,
725 		.extra1		= &minolduid,
726 		.extra2		= &maxolduid,
727 	},
728 	{
729 		.procname	= "overflowgid",
730 		.data		= &overflowgid,
731 		.maxlen		= sizeof(int),
732 		.mode		= 0644,
733 		.proc_handler	= proc_dointvec_minmax,
734 		.extra1		= &minolduid,
735 		.extra2		= &maxolduid,
736 	},
737 #ifdef CONFIG_S390
738 #ifdef CONFIG_MATHEMU
739 	{
740 		.procname	= "ieee_emulation_warnings",
741 		.data		= &sysctl_ieee_emulation_warnings,
742 		.maxlen		= sizeof(int),
743 		.mode		= 0644,
744 		.proc_handler	= proc_dointvec,
745 	},
746 #endif
747 	{
748 		.procname	= "userprocess_debug",
749 		.data		= &show_unhandled_signals,
750 		.maxlen		= sizeof(int),
751 		.mode		= 0644,
752 		.proc_handler	= proc_dointvec,
753 	},
754 #endif
755 	{
756 		.procname	= "pid_max",
757 		.data		= &pid_max,
758 		.maxlen		= sizeof (int),
759 		.mode		= 0644,
760 		.proc_handler	= proc_dointvec_minmax,
761 		.extra1		= &pid_max_min,
762 		.extra2		= &pid_max_max,
763 	},
764 	{
765 		.procname	= "panic_on_oops",
766 		.data		= &panic_on_oops,
767 		.maxlen		= sizeof(int),
768 		.mode		= 0644,
769 		.proc_handler	= proc_dointvec,
770 	},
771 #if defined CONFIG_PRINTK
772 	{
773 		.procname	= "printk",
774 		.data		= &console_loglevel,
775 		.maxlen		= 4*sizeof(int),
776 		.mode		= 0644,
777 		.proc_handler	= proc_dointvec,
778 	},
779 	{
780 		.procname	= "printk_ratelimit",
781 		.data		= &printk_ratelimit_state.interval,
782 		.maxlen		= sizeof(int),
783 		.mode		= 0644,
784 		.proc_handler	= proc_dointvec_jiffies,
785 	},
786 	{
787 		.procname	= "printk_ratelimit_burst",
788 		.data		= &printk_ratelimit_state.burst,
789 		.maxlen		= sizeof(int),
790 		.mode		= 0644,
791 		.proc_handler	= proc_dointvec,
792 	},
793 	{
794 		.procname	= "printk_delay",
795 		.data		= &printk_delay_msec,
796 		.maxlen		= sizeof(int),
797 		.mode		= 0644,
798 		.proc_handler	= proc_dointvec_minmax,
799 		.extra1		= &zero,
800 		.extra2		= &ten_thousand,
801 	},
802 	{
803 		.procname	= "dmesg_restrict",
804 		.data		= &dmesg_restrict,
805 		.maxlen		= sizeof(int),
806 		.mode		= 0644,
807 		.proc_handler	= proc_dointvec_minmax_sysadmin,
808 		.extra1		= &zero,
809 		.extra2		= &one,
810 	},
811 	{
812 		.procname	= "kptr_restrict",
813 		.data		= &kptr_restrict,
814 		.maxlen		= sizeof(int),
815 		.mode		= 0644,
816 		.proc_handler	= proc_dointvec_minmax_sysadmin,
817 		.extra1		= &zero,
818 		.extra2		= &two,
819 	},
820 #endif
821 	{
822 		.procname	= "ngroups_max",
823 		.data		= &ngroups_max,
824 		.maxlen		= sizeof (int),
825 		.mode		= 0444,
826 		.proc_handler	= proc_dointvec,
827 	},
828 	{
829 		.procname	= "cap_last_cap",
830 		.data		= (void *)&cap_last_cap,
831 		.maxlen		= sizeof(int),
832 		.mode		= 0444,
833 		.proc_handler	= proc_dointvec,
834 	},
835 #if defined(CONFIG_LOCKUP_DETECTOR)
836 	{
837 		.procname       = "watchdog",
838 		.data           = &watchdog_user_enabled,
839 		.maxlen         = sizeof (int),
840 		.mode           = 0644,
841 		.proc_handler   = proc_dowatchdog,
842 		.extra1		= &zero,
843 		.extra2		= &one,
844 	},
845 	{
846 		.procname	= "watchdog_thresh",
847 		.data		= &watchdog_thresh,
848 		.maxlen		= sizeof(int),
849 		.mode		= 0644,
850 		.proc_handler	= proc_dowatchdog,
851 		.extra1		= &zero,
852 		.extra2		= &sixty,
853 	},
854 	{
855 		.procname	= "softlockup_panic",
856 		.data		= &softlockup_panic,
857 		.maxlen		= sizeof(int),
858 		.mode		= 0644,
859 		.proc_handler	= proc_dointvec_minmax,
860 		.extra1		= &zero,
861 		.extra2		= &one,
862 	},
863 #ifdef CONFIG_SMP
864 	{
865 		.procname	= "softlockup_all_cpu_backtrace",
866 		.data		= &sysctl_softlockup_all_cpu_backtrace,
867 		.maxlen		= sizeof(int),
868 		.mode		= 0644,
869 		.proc_handler	= proc_dointvec_minmax,
870 		.extra1		= &zero,
871 		.extra2		= &one,
872 	},
873 #endif /* CONFIG_SMP */
874 	{
875 		.procname       = "nmi_watchdog",
876 		.data           = &watchdog_user_enabled,
877 		.maxlen         = sizeof (int),
878 		.mode           = 0644,
879 		.proc_handler   = proc_dowatchdog,
880 		.extra1		= &zero,
881 		.extra2		= &one,
882 	},
883 #endif
884 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
885 	{
886 		.procname       = "unknown_nmi_panic",
887 		.data           = &unknown_nmi_panic,
888 		.maxlen         = sizeof (int),
889 		.mode           = 0644,
890 		.proc_handler   = proc_dointvec,
891 	},
892 #endif
893 #if defined(CONFIG_X86)
894 	{
895 		.procname	= "panic_on_unrecovered_nmi",
896 		.data		= &panic_on_unrecovered_nmi,
897 		.maxlen		= sizeof(int),
898 		.mode		= 0644,
899 		.proc_handler	= proc_dointvec,
900 	},
901 	{
902 		.procname	= "panic_on_io_nmi",
903 		.data		= &panic_on_io_nmi,
904 		.maxlen		= sizeof(int),
905 		.mode		= 0644,
906 		.proc_handler	= proc_dointvec,
907 	},
908 #ifdef CONFIG_DEBUG_STACKOVERFLOW
909 	{
910 		.procname	= "panic_on_stackoverflow",
911 		.data		= &sysctl_panic_on_stackoverflow,
912 		.maxlen		= sizeof(int),
913 		.mode		= 0644,
914 		.proc_handler	= proc_dointvec,
915 	},
916 #endif
917 	{
918 		.procname	= "bootloader_type",
919 		.data		= &bootloader_type,
920 		.maxlen		= sizeof (int),
921 		.mode		= 0444,
922 		.proc_handler	= proc_dointvec,
923 	},
924 	{
925 		.procname	= "bootloader_version",
926 		.data		= &bootloader_version,
927 		.maxlen		= sizeof (int),
928 		.mode		= 0444,
929 		.proc_handler	= proc_dointvec,
930 	},
931 	{
932 		.procname	= "kstack_depth_to_print",
933 		.data		= &kstack_depth_to_print,
934 		.maxlen		= sizeof(int),
935 		.mode		= 0644,
936 		.proc_handler	= proc_dointvec,
937 	},
938 	{
939 		.procname	= "io_delay_type",
940 		.data		= &io_delay_type,
941 		.maxlen		= sizeof(int),
942 		.mode		= 0644,
943 		.proc_handler	= proc_dointvec,
944 	},
945 #endif
946 #if defined(CONFIG_MMU)
947 	{
948 		.procname	= "randomize_va_space",
949 		.data		= &randomize_va_space,
950 		.maxlen		= sizeof(int),
951 		.mode		= 0644,
952 		.proc_handler	= proc_dointvec,
953 	},
954 #endif
955 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
956 	{
957 		.procname	= "spin_retry",
958 		.data		= &spin_retry,
959 		.maxlen		= sizeof (int),
960 		.mode		= 0644,
961 		.proc_handler	= proc_dointvec,
962 	},
963 #endif
964 #if	defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
965 	{
966 		.procname	= "acpi_video_flags",
967 		.data		= &acpi_realmode_flags,
968 		.maxlen		= sizeof (unsigned long),
969 		.mode		= 0644,
970 		.proc_handler	= proc_doulongvec_minmax,
971 	},
972 #endif
973 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
974 	{
975 		.procname	= "ignore-unaligned-usertrap",
976 		.data		= &no_unaligned_warning,
977 		.maxlen		= sizeof (int),
978 	 	.mode		= 0644,
979 		.proc_handler	= proc_dointvec,
980 	},
981 #endif
982 #ifdef CONFIG_IA64
983 	{
984 		.procname	= "unaligned-dump-stack",
985 		.data		= &unaligned_dump_stack,
986 		.maxlen		= sizeof (int),
987 		.mode		= 0644,
988 		.proc_handler	= proc_dointvec,
989 	},
990 #endif
991 #ifdef CONFIG_DETECT_HUNG_TASK
992 	{
993 		.procname	= "hung_task_panic",
994 		.data		= &sysctl_hung_task_panic,
995 		.maxlen		= sizeof(int),
996 		.mode		= 0644,
997 		.proc_handler	= proc_dointvec_minmax,
998 		.extra1		= &zero,
999 		.extra2		= &one,
1000 	},
1001 	{
1002 		.procname	= "hung_task_check_count",
1003 		.data		= &sysctl_hung_task_check_count,
1004 		.maxlen		= sizeof(int),
1005 		.mode		= 0644,
1006 		.proc_handler	= proc_dointvec_minmax,
1007 		.extra1		= &zero,
1008 	},
1009 	{
1010 		.procname	= "hung_task_timeout_secs",
1011 		.data		= &sysctl_hung_task_timeout_secs,
1012 		.maxlen		= sizeof(unsigned long),
1013 		.mode		= 0644,
1014 		.proc_handler	= proc_dohung_task_timeout_secs,
1015 		.extra2		= &hung_task_timeout_max,
1016 	},
1017 	{
1018 		.procname	= "hung_task_warnings",
1019 		.data		= &sysctl_hung_task_warnings,
1020 		.maxlen		= sizeof(int),
1021 		.mode		= 0644,
1022 		.proc_handler	= proc_dointvec_minmax,
1023 		.extra1		= &neg_one,
1024 	},
1025 #endif
1026 #ifdef CONFIG_COMPAT
1027 	{
1028 		.procname	= "compat-log",
1029 		.data		= &compat_log,
1030 		.maxlen		= sizeof (int),
1031 	 	.mode		= 0644,
1032 		.proc_handler	= proc_dointvec,
1033 	},
1034 #endif
1035 #ifdef CONFIG_RT_MUTEXES
1036 	{
1037 		.procname	= "max_lock_depth",
1038 		.data		= &max_lock_depth,
1039 		.maxlen		= sizeof(int),
1040 		.mode		= 0644,
1041 		.proc_handler	= proc_dointvec,
1042 	},
1043 #endif
1044 	{
1045 		.procname	= "poweroff_cmd",
1046 		.data		= &poweroff_cmd,
1047 		.maxlen		= POWEROFF_CMD_PATH_LEN,
1048 		.mode		= 0644,
1049 		.proc_handler	= proc_dostring,
1050 	},
1051 #ifdef CONFIG_KEYS
1052 	{
1053 		.procname	= "keys",
1054 		.mode		= 0555,
1055 		.child		= key_sysctls,
1056 	},
1057 #endif
1058 #ifdef CONFIG_RCU_TORTURE_TEST
1059 	{
1060 		.procname       = "rcutorture_runnable",
1061 		.data           = &rcutorture_runnable,
1062 		.maxlen         = sizeof(int),
1063 		.mode           = 0644,
1064 		.proc_handler	= proc_dointvec,
1065 	},
1066 #endif
1067 #ifdef CONFIG_PERF_EVENTS
1068 	/*
1069 	 * User-space scripts rely on the existence of this file
1070 	 * as a feature check for perf_events being enabled.
1071 	 *
1072 	 * So it's an ABI, do not remove!
1073 	 */
1074 	{
1075 		.procname	= "perf_event_paranoid",
1076 		.data		= &sysctl_perf_event_paranoid,
1077 		.maxlen		= sizeof(sysctl_perf_event_paranoid),
1078 		.mode		= 0644,
1079 		.proc_handler	= proc_dointvec,
1080 	},
1081 	{
1082 		.procname	= "perf_event_mlock_kb",
1083 		.data		= &sysctl_perf_event_mlock,
1084 		.maxlen		= sizeof(sysctl_perf_event_mlock),
1085 		.mode		= 0644,
1086 		.proc_handler	= proc_dointvec,
1087 	},
1088 	{
1089 		.procname	= "perf_event_max_sample_rate",
1090 		.data		= &sysctl_perf_event_sample_rate,
1091 		.maxlen		= sizeof(sysctl_perf_event_sample_rate),
1092 		.mode		= 0644,
1093 		.proc_handler	= perf_proc_update_handler,
1094 		.extra1		= &one,
1095 	},
1096 	{
1097 		.procname	= "perf_cpu_time_max_percent",
1098 		.data		= &sysctl_perf_cpu_time_max_percent,
1099 		.maxlen		= sizeof(sysctl_perf_cpu_time_max_percent),
1100 		.mode		= 0644,
1101 		.proc_handler	= perf_cpu_time_max_percent_handler,
1102 		.extra1		= &zero,
1103 		.extra2		= &one_hundred,
1104 	},
1105 #endif
1106 #ifdef CONFIG_KMEMCHECK
1107 	{
1108 		.procname	= "kmemcheck",
1109 		.data		= &kmemcheck_enabled,
1110 		.maxlen		= sizeof(int),
1111 		.mode		= 0644,
1112 		.proc_handler	= proc_dointvec,
1113 	},
1114 #endif
1115 	{ }
1116 };
1117 
1118 static struct ctl_table vm_table[] = {
1119 	{
1120 		.procname	= "overcommit_memory",
1121 		.data		= &sysctl_overcommit_memory,
1122 		.maxlen		= sizeof(sysctl_overcommit_memory),
1123 		.mode		= 0644,
1124 		.proc_handler	= proc_dointvec_minmax,
1125 		.extra1		= &zero,
1126 		.extra2		= &two,
1127 	},
1128 	{
1129 		.procname	= "panic_on_oom",
1130 		.data		= &sysctl_panic_on_oom,
1131 		.maxlen		= sizeof(sysctl_panic_on_oom),
1132 		.mode		= 0644,
1133 		.proc_handler	= proc_dointvec_minmax,
1134 		.extra1		= &zero,
1135 		.extra2		= &two,
1136 	},
1137 	{
1138 		.procname	= "oom_kill_allocating_task",
1139 		.data		= &sysctl_oom_kill_allocating_task,
1140 		.maxlen		= sizeof(sysctl_oom_kill_allocating_task),
1141 		.mode		= 0644,
1142 		.proc_handler	= proc_dointvec,
1143 	},
1144 	{
1145 		.procname	= "oom_dump_tasks",
1146 		.data		= &sysctl_oom_dump_tasks,
1147 		.maxlen		= sizeof(sysctl_oom_dump_tasks),
1148 		.mode		= 0644,
1149 		.proc_handler	= proc_dointvec,
1150 	},
1151 	{
1152 		.procname	= "overcommit_ratio",
1153 		.data		= &sysctl_overcommit_ratio,
1154 		.maxlen		= sizeof(sysctl_overcommit_ratio),
1155 		.mode		= 0644,
1156 		.proc_handler	= overcommit_ratio_handler,
1157 	},
1158 	{
1159 		.procname	= "overcommit_kbytes",
1160 		.data		= &sysctl_overcommit_kbytes,
1161 		.maxlen		= sizeof(sysctl_overcommit_kbytes),
1162 		.mode		= 0644,
1163 		.proc_handler	= overcommit_kbytes_handler,
1164 	},
1165 	{
1166 		.procname	= "page-cluster",
1167 		.data		= &page_cluster,
1168 		.maxlen		= sizeof(int),
1169 		.mode		= 0644,
1170 		.proc_handler	= proc_dointvec_minmax,
1171 		.extra1		= &zero,
1172 	},
1173 	{
1174 		.procname	= "dirty_background_ratio",
1175 		.data		= &dirty_background_ratio,
1176 		.maxlen		= sizeof(dirty_background_ratio),
1177 		.mode		= 0644,
1178 		.proc_handler	= dirty_background_ratio_handler,
1179 		.extra1		= &zero,
1180 		.extra2		= &one_hundred,
1181 	},
1182 	{
1183 		.procname	= "dirty_background_bytes",
1184 		.data		= &dirty_background_bytes,
1185 		.maxlen		= sizeof(dirty_background_bytes),
1186 		.mode		= 0644,
1187 		.proc_handler	= dirty_background_bytes_handler,
1188 		.extra1		= &one_ul,
1189 	},
1190 	{
1191 		.procname	= "dirty_ratio",
1192 		.data		= &vm_dirty_ratio,
1193 		.maxlen		= sizeof(vm_dirty_ratio),
1194 		.mode		= 0644,
1195 		.proc_handler	= dirty_ratio_handler,
1196 		.extra1		= &zero,
1197 		.extra2		= &one_hundred,
1198 	},
1199 	{
1200 		.procname	= "dirty_bytes",
1201 		.data		= &vm_dirty_bytes,
1202 		.maxlen		= sizeof(vm_dirty_bytes),
1203 		.mode		= 0644,
1204 		.proc_handler	= dirty_bytes_handler,
1205 		.extra1		= &dirty_bytes_min,
1206 	},
1207 	{
1208 		.procname	= "dirty_writeback_centisecs",
1209 		.data		= &dirty_writeback_interval,
1210 		.maxlen		= sizeof(dirty_writeback_interval),
1211 		.mode		= 0644,
1212 		.proc_handler	= dirty_writeback_centisecs_handler,
1213 	},
1214 	{
1215 		.procname	= "dirty_expire_centisecs",
1216 		.data		= &dirty_expire_interval,
1217 		.maxlen		= sizeof(dirty_expire_interval),
1218 		.mode		= 0644,
1219 		.proc_handler	= proc_dointvec_minmax,
1220 		.extra1		= &zero,
1221 	},
1222 	{
1223 		.procname       = "nr_pdflush_threads",
1224 		.mode           = 0444 /* read-only */,
1225 		.proc_handler   = pdflush_proc_obsolete,
1226 	},
1227 	{
1228 		.procname	= "swappiness",
1229 		.data		= &vm_swappiness,
1230 		.maxlen		= sizeof(vm_swappiness),
1231 		.mode		= 0644,
1232 		.proc_handler	= proc_dointvec_minmax,
1233 		.extra1		= &zero,
1234 		.extra2		= &one_hundred,
1235 	},
1236 #ifdef CONFIG_HUGETLB_PAGE
1237 	{
1238 		.procname	= "nr_hugepages",
1239 		.data		= NULL,
1240 		.maxlen		= sizeof(unsigned long),
1241 		.mode		= 0644,
1242 		.proc_handler	= hugetlb_sysctl_handler,
1243 		.extra1		= (void *)&hugetlb_zero,
1244 		.extra2		= (void *)&hugetlb_infinity,
1245 	},
1246 #ifdef CONFIG_NUMA
1247 	{
1248 		.procname       = "nr_hugepages_mempolicy",
1249 		.data           = NULL,
1250 		.maxlen         = sizeof(unsigned long),
1251 		.mode           = 0644,
1252 		.proc_handler   = &hugetlb_mempolicy_sysctl_handler,
1253 		.extra1		= (void *)&hugetlb_zero,
1254 		.extra2		= (void *)&hugetlb_infinity,
1255 	},
1256 #endif
1257 	 {
1258 		.procname	= "hugetlb_shm_group",
1259 		.data		= &sysctl_hugetlb_shm_group,
1260 		.maxlen		= sizeof(gid_t),
1261 		.mode		= 0644,
1262 		.proc_handler	= proc_dointvec,
1263 	 },
1264 	 {
1265 		.procname	= "hugepages_treat_as_movable",
1266 		.data		= &hugepages_treat_as_movable,
1267 		.maxlen		= sizeof(int),
1268 		.mode		= 0644,
1269 		.proc_handler	= proc_dointvec,
1270 	},
1271 	{
1272 		.procname	= "nr_overcommit_hugepages",
1273 		.data		= NULL,
1274 		.maxlen		= sizeof(unsigned long),
1275 		.mode		= 0644,
1276 		.proc_handler	= hugetlb_overcommit_handler,
1277 		.extra1		= (void *)&hugetlb_zero,
1278 		.extra2		= (void *)&hugetlb_infinity,
1279 	},
1280 #endif
1281 	{
1282 		.procname	= "lowmem_reserve_ratio",
1283 		.data		= &sysctl_lowmem_reserve_ratio,
1284 		.maxlen		= sizeof(sysctl_lowmem_reserve_ratio),
1285 		.mode		= 0644,
1286 		.proc_handler	= lowmem_reserve_ratio_sysctl_handler,
1287 	},
1288 	{
1289 		.procname	= "drop_caches",
1290 		.data		= &sysctl_drop_caches,
1291 		.maxlen		= sizeof(int),
1292 		.mode		= 0644,
1293 		.proc_handler	= drop_caches_sysctl_handler,
1294 		.extra1		= &one,
1295 		.extra2		= &four,
1296 	},
1297 #ifdef CONFIG_COMPACTION
1298 	{
1299 		.procname	= "compact_memory",
1300 		.data		= &sysctl_compact_memory,
1301 		.maxlen		= sizeof(int),
1302 		.mode		= 0200,
1303 		.proc_handler	= sysctl_compaction_handler,
1304 	},
1305 	{
1306 		.procname	= "extfrag_threshold",
1307 		.data		= &sysctl_extfrag_threshold,
1308 		.maxlen		= sizeof(int),
1309 		.mode		= 0644,
1310 		.proc_handler	= sysctl_extfrag_handler,
1311 		.extra1		= &min_extfrag_threshold,
1312 		.extra2		= &max_extfrag_threshold,
1313 	},
1314 
1315 #endif /* CONFIG_COMPACTION */
1316 	{
1317 		.procname	= "min_free_kbytes",
1318 		.data		= &min_free_kbytes,
1319 		.maxlen		= sizeof(min_free_kbytes),
1320 		.mode		= 0644,
1321 		.proc_handler	= min_free_kbytes_sysctl_handler,
1322 		.extra1		= &zero,
1323 	},
1324 	{
1325 		.procname	= "percpu_pagelist_fraction",
1326 		.data		= &percpu_pagelist_fraction,
1327 		.maxlen		= sizeof(percpu_pagelist_fraction),
1328 		.mode		= 0644,
1329 		.proc_handler	= percpu_pagelist_fraction_sysctl_handler,
1330 		.extra1		= &zero,
1331 	},
1332 #ifdef CONFIG_MMU
1333 	{
1334 		.procname	= "max_map_count",
1335 		.data		= &sysctl_max_map_count,
1336 		.maxlen		= sizeof(sysctl_max_map_count),
1337 		.mode		= 0644,
1338 		.proc_handler	= proc_dointvec_minmax,
1339 		.extra1		= &zero,
1340 	},
1341 #else
1342 	{
1343 		.procname	= "nr_trim_pages",
1344 		.data		= &sysctl_nr_trim_pages,
1345 		.maxlen		= sizeof(sysctl_nr_trim_pages),
1346 		.mode		= 0644,
1347 		.proc_handler	= proc_dointvec_minmax,
1348 		.extra1		= &zero,
1349 	},
1350 #endif
1351 	{
1352 		.procname	= "laptop_mode",
1353 		.data		= &laptop_mode,
1354 		.maxlen		= sizeof(laptop_mode),
1355 		.mode		= 0644,
1356 		.proc_handler	= proc_dointvec_jiffies,
1357 	},
1358 	{
1359 		.procname	= "block_dump",
1360 		.data		= &block_dump,
1361 		.maxlen		= sizeof(block_dump),
1362 		.mode		= 0644,
1363 		.proc_handler	= proc_dointvec,
1364 		.extra1		= &zero,
1365 	},
1366 	{
1367 		.procname	= "vfs_cache_pressure",
1368 		.data		= &sysctl_vfs_cache_pressure,
1369 		.maxlen		= sizeof(sysctl_vfs_cache_pressure),
1370 		.mode		= 0644,
1371 		.proc_handler	= proc_dointvec,
1372 		.extra1		= &zero,
1373 	},
1374 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1375 	{
1376 		.procname	= "legacy_va_layout",
1377 		.data		= &sysctl_legacy_va_layout,
1378 		.maxlen		= sizeof(sysctl_legacy_va_layout),
1379 		.mode		= 0644,
1380 		.proc_handler	= proc_dointvec,
1381 		.extra1		= &zero,
1382 	},
1383 #endif
1384 #ifdef CONFIG_NUMA
1385 	{
1386 		.procname	= "zone_reclaim_mode",
1387 		.data		= &zone_reclaim_mode,
1388 		.maxlen		= sizeof(zone_reclaim_mode),
1389 		.mode		= 0644,
1390 		.proc_handler	= proc_dointvec,
1391 		.extra1		= &zero,
1392 	},
1393 	{
1394 		.procname	= "min_unmapped_ratio",
1395 		.data		= &sysctl_min_unmapped_ratio,
1396 		.maxlen		= sizeof(sysctl_min_unmapped_ratio),
1397 		.mode		= 0644,
1398 		.proc_handler	= sysctl_min_unmapped_ratio_sysctl_handler,
1399 		.extra1		= &zero,
1400 		.extra2		= &one_hundred,
1401 	},
1402 	{
1403 		.procname	= "min_slab_ratio",
1404 		.data		= &sysctl_min_slab_ratio,
1405 		.maxlen		= sizeof(sysctl_min_slab_ratio),
1406 		.mode		= 0644,
1407 		.proc_handler	= sysctl_min_slab_ratio_sysctl_handler,
1408 		.extra1		= &zero,
1409 		.extra2		= &one_hundred,
1410 	},
1411 #endif
1412 #ifdef CONFIG_SMP
1413 	{
1414 		.procname	= "stat_interval",
1415 		.data		= &sysctl_stat_interval,
1416 		.maxlen		= sizeof(sysctl_stat_interval),
1417 		.mode		= 0644,
1418 		.proc_handler	= proc_dointvec_jiffies,
1419 	},
1420 #endif
1421 #ifdef CONFIG_MMU
1422 	{
1423 		.procname	= "mmap_min_addr",
1424 		.data		= &dac_mmap_min_addr,
1425 		.maxlen		= sizeof(unsigned long),
1426 		.mode		= 0644,
1427 		.proc_handler	= mmap_min_addr_handler,
1428 	},
1429 #endif
1430 #ifdef CONFIG_NUMA
1431 	{
1432 		.procname	= "numa_zonelist_order",
1433 		.data		= &numa_zonelist_order,
1434 		.maxlen		= NUMA_ZONELIST_ORDER_LEN,
1435 		.mode		= 0644,
1436 		.proc_handler	= numa_zonelist_order_handler,
1437 	},
1438 #endif
1439 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1440    (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1441 	{
1442 		.procname	= "vdso_enabled",
1443 #ifdef CONFIG_X86_32
1444 		.data		= &vdso32_enabled,
1445 		.maxlen		= sizeof(vdso32_enabled),
1446 #else
1447 		.data		= &vdso_enabled,
1448 		.maxlen		= sizeof(vdso_enabled),
1449 #endif
1450 		.mode		= 0644,
1451 		.proc_handler	= proc_dointvec,
1452 		.extra1		= &zero,
1453 	},
1454 #endif
1455 #ifdef CONFIG_HIGHMEM
1456 	{
1457 		.procname	= "highmem_is_dirtyable",
1458 		.data		= &vm_highmem_is_dirtyable,
1459 		.maxlen		= sizeof(vm_highmem_is_dirtyable),
1460 		.mode		= 0644,
1461 		.proc_handler	= proc_dointvec_minmax,
1462 		.extra1		= &zero,
1463 		.extra2		= &one,
1464 	},
1465 #endif
1466 	{
1467 		.procname	= "scan_unevictable_pages",
1468 		.data		= &scan_unevictable_pages,
1469 		.maxlen		= sizeof(scan_unevictable_pages),
1470 		.mode		= 0644,
1471 		.proc_handler	= scan_unevictable_handler,
1472 	},
1473 #ifdef CONFIG_MEMORY_FAILURE
1474 	{
1475 		.procname	= "memory_failure_early_kill",
1476 		.data		= &sysctl_memory_failure_early_kill,
1477 		.maxlen		= sizeof(sysctl_memory_failure_early_kill),
1478 		.mode		= 0644,
1479 		.proc_handler	= proc_dointvec_minmax,
1480 		.extra1		= &zero,
1481 		.extra2		= &one,
1482 	},
1483 	{
1484 		.procname	= "memory_failure_recovery",
1485 		.data		= &sysctl_memory_failure_recovery,
1486 		.maxlen		= sizeof(sysctl_memory_failure_recovery),
1487 		.mode		= 0644,
1488 		.proc_handler	= proc_dointvec_minmax,
1489 		.extra1		= &zero,
1490 		.extra2		= &one,
1491 	},
1492 #endif
1493 	{
1494 		.procname	= "user_reserve_kbytes",
1495 		.data		= &sysctl_user_reserve_kbytes,
1496 		.maxlen		= sizeof(sysctl_user_reserve_kbytes),
1497 		.mode		= 0644,
1498 		.proc_handler	= proc_doulongvec_minmax,
1499 	},
1500 	{
1501 		.procname	= "admin_reserve_kbytes",
1502 		.data		= &sysctl_admin_reserve_kbytes,
1503 		.maxlen		= sizeof(sysctl_admin_reserve_kbytes),
1504 		.mode		= 0644,
1505 		.proc_handler	= proc_doulongvec_minmax,
1506 	},
1507 	{ }
1508 };
1509 
1510 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1511 static struct ctl_table binfmt_misc_table[] = {
1512 	{ }
1513 };
1514 #endif
1515 
1516 static struct ctl_table fs_table[] = {
1517 	{
1518 		.procname	= "inode-nr",
1519 		.data		= &inodes_stat,
1520 		.maxlen		= 2*sizeof(long),
1521 		.mode		= 0444,
1522 		.proc_handler	= proc_nr_inodes,
1523 	},
1524 	{
1525 		.procname	= "inode-state",
1526 		.data		= &inodes_stat,
1527 		.maxlen		= 7*sizeof(long),
1528 		.mode		= 0444,
1529 		.proc_handler	= proc_nr_inodes,
1530 	},
1531 	{
1532 		.procname	= "file-nr",
1533 		.data		= &files_stat,
1534 		.maxlen		= sizeof(files_stat),
1535 		.mode		= 0444,
1536 		.proc_handler	= proc_nr_files,
1537 	},
1538 	{
1539 		.procname	= "file-max",
1540 		.data		= &files_stat.max_files,
1541 		.maxlen		= sizeof(files_stat.max_files),
1542 		.mode		= 0644,
1543 		.proc_handler	= proc_doulongvec_minmax,
1544 	},
1545 	{
1546 		.procname	= "nr_open",
1547 		.data		= &sysctl_nr_open,
1548 		.maxlen		= sizeof(int),
1549 		.mode		= 0644,
1550 		.proc_handler	= proc_dointvec_minmax,
1551 		.extra1		= &sysctl_nr_open_min,
1552 		.extra2		= &sysctl_nr_open_max,
1553 	},
1554 	{
1555 		.procname	= "dentry-state",
1556 		.data		= &dentry_stat,
1557 		.maxlen		= 6*sizeof(long),
1558 		.mode		= 0444,
1559 		.proc_handler	= proc_nr_dentry,
1560 	},
1561 	{
1562 		.procname	= "overflowuid",
1563 		.data		= &fs_overflowuid,
1564 		.maxlen		= sizeof(int),
1565 		.mode		= 0644,
1566 		.proc_handler	= proc_dointvec_minmax,
1567 		.extra1		= &minolduid,
1568 		.extra2		= &maxolduid,
1569 	},
1570 	{
1571 		.procname	= "overflowgid",
1572 		.data		= &fs_overflowgid,
1573 		.maxlen		= sizeof(int),
1574 		.mode		= 0644,
1575 		.proc_handler	= proc_dointvec_minmax,
1576 		.extra1		= &minolduid,
1577 		.extra2		= &maxolduid,
1578 	},
1579 #ifdef CONFIG_FILE_LOCKING
1580 	{
1581 		.procname	= "leases-enable",
1582 		.data		= &leases_enable,
1583 		.maxlen		= sizeof(int),
1584 		.mode		= 0644,
1585 		.proc_handler	= proc_dointvec,
1586 	},
1587 #endif
1588 #ifdef CONFIG_DNOTIFY
1589 	{
1590 		.procname	= "dir-notify-enable",
1591 		.data		= &dir_notify_enable,
1592 		.maxlen		= sizeof(int),
1593 		.mode		= 0644,
1594 		.proc_handler	= proc_dointvec,
1595 	},
1596 #endif
1597 #ifdef CONFIG_MMU
1598 #ifdef CONFIG_FILE_LOCKING
1599 	{
1600 		.procname	= "lease-break-time",
1601 		.data		= &lease_break_time,
1602 		.maxlen		= sizeof(int),
1603 		.mode		= 0644,
1604 		.proc_handler	= proc_dointvec,
1605 	},
1606 #endif
1607 #ifdef CONFIG_AIO
1608 	{
1609 		.procname	= "aio-nr",
1610 		.data		= &aio_nr,
1611 		.maxlen		= sizeof(aio_nr),
1612 		.mode		= 0444,
1613 		.proc_handler	= proc_doulongvec_minmax,
1614 	},
1615 	{
1616 		.procname	= "aio-max-nr",
1617 		.data		= &aio_max_nr,
1618 		.maxlen		= sizeof(aio_max_nr),
1619 		.mode		= 0644,
1620 		.proc_handler	= proc_doulongvec_minmax,
1621 	},
1622 #endif /* CONFIG_AIO */
1623 #ifdef CONFIG_INOTIFY_USER
1624 	{
1625 		.procname	= "inotify",
1626 		.mode		= 0555,
1627 		.child		= inotify_table,
1628 	},
1629 #endif
1630 #ifdef CONFIG_EPOLL
1631 	{
1632 		.procname	= "epoll",
1633 		.mode		= 0555,
1634 		.child		= epoll_table,
1635 	},
1636 #endif
1637 #endif
1638 	{
1639 		.procname	= "protected_symlinks",
1640 		.data		= &sysctl_protected_symlinks,
1641 		.maxlen		= sizeof(int),
1642 		.mode		= 0600,
1643 		.proc_handler	= proc_dointvec_minmax,
1644 		.extra1		= &zero,
1645 		.extra2		= &one,
1646 	},
1647 	{
1648 		.procname	= "protected_hardlinks",
1649 		.data		= &sysctl_protected_hardlinks,
1650 		.maxlen		= sizeof(int),
1651 		.mode		= 0600,
1652 		.proc_handler	= proc_dointvec_minmax,
1653 		.extra1		= &zero,
1654 		.extra2		= &one,
1655 	},
1656 	{
1657 		.procname	= "suid_dumpable",
1658 		.data		= &suid_dumpable,
1659 		.maxlen		= sizeof(int),
1660 		.mode		= 0644,
1661 		.proc_handler	= proc_dointvec_minmax_coredump,
1662 		.extra1		= &zero,
1663 		.extra2		= &two,
1664 	},
1665 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1666 	{
1667 		.procname	= "binfmt_misc",
1668 		.mode		= 0555,
1669 		.child		= binfmt_misc_table,
1670 	},
1671 #endif
1672 	{
1673 		.procname	= "pipe-max-size",
1674 		.data		= &pipe_max_size,
1675 		.maxlen		= sizeof(int),
1676 		.mode		= 0644,
1677 		.proc_handler	= &pipe_proc_fn,
1678 		.extra1		= &pipe_min_size,
1679 	},
1680 	{ }
1681 };
1682 
1683 static struct ctl_table debug_table[] = {
1684 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1685 	{
1686 		.procname	= "exception-trace",
1687 		.data		= &show_unhandled_signals,
1688 		.maxlen		= sizeof(int),
1689 		.mode		= 0644,
1690 		.proc_handler	= proc_dointvec
1691 	},
1692 #endif
1693 #if defined(CONFIG_OPTPROBES)
1694 	{
1695 		.procname	= "kprobes-optimization",
1696 		.data		= &sysctl_kprobes_optimization,
1697 		.maxlen		= sizeof(int),
1698 		.mode		= 0644,
1699 		.proc_handler	= proc_kprobes_optimization_handler,
1700 		.extra1		= &zero,
1701 		.extra2		= &one,
1702 	},
1703 #endif
1704 	{ }
1705 };
1706 
1707 static struct ctl_table dev_table[] = {
1708 	{ }
1709 };
1710 
1711 int __init sysctl_init(void)
1712 {
1713 	struct ctl_table_header *hdr;
1714 
1715 	hdr = register_sysctl_table(sysctl_base_table);
1716 	kmemleak_not_leak(hdr);
1717 	return 0;
1718 }
1719 
1720 #endif /* CONFIG_SYSCTL */
1721 
1722 /*
1723  * /proc/sys support
1724  */
1725 
1726 #ifdef CONFIG_PROC_SYSCTL
1727 
1728 static int _proc_do_string(char *data, int maxlen, int write,
1729 			   char __user *buffer,
1730 			   size_t *lenp, loff_t *ppos)
1731 {
1732 	size_t len;
1733 	char __user *p;
1734 	char c;
1735 
1736 	if (!data || !maxlen || !*lenp) {
1737 		*lenp = 0;
1738 		return 0;
1739 	}
1740 
1741 	if (write) {
1742 		if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) {
1743 			/* Only continue writes not past the end of buffer. */
1744 			len = strlen(data);
1745 			if (len > maxlen - 1)
1746 				len = maxlen - 1;
1747 
1748 			if (*ppos > len)
1749 				return 0;
1750 			len = *ppos;
1751 		} else {
1752 			/* Start writing from beginning of buffer. */
1753 			len = 0;
1754 		}
1755 
1756 		*ppos += *lenp;
1757 		p = buffer;
1758 		while ((p - buffer) < *lenp && len < maxlen - 1) {
1759 			if (get_user(c, p++))
1760 				return -EFAULT;
1761 			if (c == 0 || c == '\n')
1762 				break;
1763 			data[len++] = c;
1764 		}
1765 		data[len] = 0;
1766 	} else {
1767 		len = strlen(data);
1768 		if (len > maxlen)
1769 			len = maxlen;
1770 
1771 		if (*ppos > len) {
1772 			*lenp = 0;
1773 			return 0;
1774 		}
1775 
1776 		data += *ppos;
1777 		len  -= *ppos;
1778 
1779 		if (len > *lenp)
1780 			len = *lenp;
1781 		if (len)
1782 			if (copy_to_user(buffer, data, len))
1783 				return -EFAULT;
1784 		if (len < *lenp) {
1785 			if (put_user('\n', buffer + len))
1786 				return -EFAULT;
1787 			len++;
1788 		}
1789 		*lenp = len;
1790 		*ppos += len;
1791 	}
1792 	return 0;
1793 }
1794 
1795 static void warn_sysctl_write(struct ctl_table *table)
1796 {
1797 	pr_warn_once("%s wrote to %s when file position was not 0!\n"
1798 		"This will not be supported in the future. To silence this\n"
1799 		"warning, set kernel.sysctl_writes_strict = -1\n",
1800 		current->comm, table->procname);
1801 }
1802 
1803 /**
1804  * proc_dostring - read a string sysctl
1805  * @table: the sysctl table
1806  * @write: %TRUE if this is a write to the sysctl file
1807  * @buffer: the user buffer
1808  * @lenp: the size of the user buffer
1809  * @ppos: file position
1810  *
1811  * Reads/writes a string from/to the user buffer. If the kernel
1812  * buffer provided is not large enough to hold the string, the
1813  * string is truncated. The copied string is %NULL-terminated.
1814  * If the string is being read by the user process, it is copied
1815  * and a newline '\n' is added. It is truncated if the buffer is
1816  * not large enough.
1817  *
1818  * Returns 0 on success.
1819  */
1820 int proc_dostring(struct ctl_table *table, int write,
1821 		  void __user *buffer, size_t *lenp, loff_t *ppos)
1822 {
1823 	if (write && *ppos && sysctl_writes_strict == SYSCTL_WRITES_WARN)
1824 		warn_sysctl_write(table);
1825 
1826 	return _proc_do_string((char *)(table->data), table->maxlen, write,
1827 			       (char __user *)buffer, lenp, ppos);
1828 }
1829 
1830 static size_t proc_skip_spaces(char **buf)
1831 {
1832 	size_t ret;
1833 	char *tmp = skip_spaces(*buf);
1834 	ret = tmp - *buf;
1835 	*buf = tmp;
1836 	return ret;
1837 }
1838 
1839 static void proc_skip_char(char **buf, size_t *size, const char v)
1840 {
1841 	while (*size) {
1842 		if (**buf != v)
1843 			break;
1844 		(*size)--;
1845 		(*buf)++;
1846 	}
1847 }
1848 
1849 #define TMPBUFLEN 22
1850 /**
1851  * proc_get_long - reads an ASCII formatted integer from a user buffer
1852  *
1853  * @buf: a kernel buffer
1854  * @size: size of the kernel buffer
1855  * @val: this is where the number will be stored
1856  * @neg: set to %TRUE if number is negative
1857  * @perm_tr: a vector which contains the allowed trailers
1858  * @perm_tr_len: size of the perm_tr vector
1859  * @tr: pointer to store the trailer character
1860  *
1861  * In case of success %0 is returned and @buf and @size are updated with
1862  * the amount of bytes read. If @tr is non-NULL and a trailing
1863  * character exists (size is non-zero after returning from this
1864  * function), @tr is updated with the trailing character.
1865  */
1866 static int proc_get_long(char **buf, size_t *size,
1867 			  unsigned long *val, bool *neg,
1868 			  const char *perm_tr, unsigned perm_tr_len, char *tr)
1869 {
1870 	int len;
1871 	char *p, tmp[TMPBUFLEN];
1872 
1873 	if (!*size)
1874 		return -EINVAL;
1875 
1876 	len = *size;
1877 	if (len > TMPBUFLEN - 1)
1878 		len = TMPBUFLEN - 1;
1879 
1880 	memcpy(tmp, *buf, len);
1881 
1882 	tmp[len] = 0;
1883 	p = tmp;
1884 	if (*p == '-' && *size > 1) {
1885 		*neg = true;
1886 		p++;
1887 	} else
1888 		*neg = false;
1889 	if (!isdigit(*p))
1890 		return -EINVAL;
1891 
1892 	*val = simple_strtoul(p, &p, 0);
1893 
1894 	len = p - tmp;
1895 
1896 	/* We don't know if the next char is whitespace thus we may accept
1897 	 * invalid integers (e.g. 1234...a) or two integers instead of one
1898 	 * (e.g. 123...1). So lets not allow such large numbers. */
1899 	if (len == TMPBUFLEN - 1)
1900 		return -EINVAL;
1901 
1902 	if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
1903 		return -EINVAL;
1904 
1905 	if (tr && (len < *size))
1906 		*tr = *p;
1907 
1908 	*buf += len;
1909 	*size -= len;
1910 
1911 	return 0;
1912 }
1913 
1914 /**
1915  * proc_put_long - converts an integer to a decimal ASCII formatted string
1916  *
1917  * @buf: the user buffer
1918  * @size: the size of the user buffer
1919  * @val: the integer to be converted
1920  * @neg: sign of the number, %TRUE for negative
1921  *
1922  * In case of success %0 is returned and @buf and @size are updated with
1923  * the amount of bytes written.
1924  */
1925 static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
1926 			  bool neg)
1927 {
1928 	int len;
1929 	char tmp[TMPBUFLEN], *p = tmp;
1930 
1931 	sprintf(p, "%s%lu", neg ? "-" : "", val);
1932 	len = strlen(tmp);
1933 	if (len > *size)
1934 		len = *size;
1935 	if (copy_to_user(*buf, tmp, len))
1936 		return -EFAULT;
1937 	*size -= len;
1938 	*buf += len;
1939 	return 0;
1940 }
1941 #undef TMPBUFLEN
1942 
1943 static int proc_put_char(void __user **buf, size_t *size, char c)
1944 {
1945 	if (*size) {
1946 		char __user **buffer = (char __user **)buf;
1947 		if (put_user(c, *buffer))
1948 			return -EFAULT;
1949 		(*size)--, (*buffer)++;
1950 		*buf = *buffer;
1951 	}
1952 	return 0;
1953 }
1954 
1955 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
1956 				 int *valp,
1957 				 int write, void *data)
1958 {
1959 	if (write) {
1960 		*valp = *negp ? -*lvalp : *lvalp;
1961 	} else {
1962 		int val = *valp;
1963 		if (val < 0) {
1964 			*negp = true;
1965 			*lvalp = (unsigned long)-val;
1966 		} else {
1967 			*negp = false;
1968 			*lvalp = (unsigned long)val;
1969 		}
1970 	}
1971 	return 0;
1972 }
1973 
1974 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
1975 
1976 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
1977 		  int write, void __user *buffer,
1978 		  size_t *lenp, loff_t *ppos,
1979 		  int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
1980 			      int write, void *data),
1981 		  void *data)
1982 {
1983 	int *i, vleft, first = 1, err = 0;
1984 	unsigned long page = 0;
1985 	size_t left;
1986 	char *kbuf;
1987 
1988 	if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
1989 		*lenp = 0;
1990 		return 0;
1991 	}
1992 
1993 	i = (int *) tbl_data;
1994 	vleft = table->maxlen / sizeof(*i);
1995 	left = *lenp;
1996 
1997 	if (!conv)
1998 		conv = do_proc_dointvec_conv;
1999 
2000 	if (write) {
2001 		if (*ppos) {
2002 			switch (sysctl_writes_strict) {
2003 			case SYSCTL_WRITES_STRICT:
2004 				goto out;
2005 			case SYSCTL_WRITES_WARN:
2006 				warn_sysctl_write(table);
2007 				break;
2008 			default:
2009 				break;
2010 			}
2011 		}
2012 
2013 		if (left > PAGE_SIZE - 1)
2014 			left = PAGE_SIZE - 1;
2015 		page = __get_free_page(GFP_TEMPORARY);
2016 		kbuf = (char *) page;
2017 		if (!kbuf)
2018 			return -ENOMEM;
2019 		if (copy_from_user(kbuf, buffer, left)) {
2020 			err = -EFAULT;
2021 			goto free;
2022 		}
2023 		kbuf[left] = 0;
2024 	}
2025 
2026 	for (; left && vleft--; i++, first=0) {
2027 		unsigned long lval;
2028 		bool neg;
2029 
2030 		if (write) {
2031 			left -= proc_skip_spaces(&kbuf);
2032 
2033 			if (!left)
2034 				break;
2035 			err = proc_get_long(&kbuf, &left, &lval, &neg,
2036 					     proc_wspace_sep,
2037 					     sizeof(proc_wspace_sep), NULL);
2038 			if (err)
2039 				break;
2040 			if (conv(&neg, &lval, i, 1, data)) {
2041 				err = -EINVAL;
2042 				break;
2043 			}
2044 		} else {
2045 			if (conv(&neg, &lval, i, 0, data)) {
2046 				err = -EINVAL;
2047 				break;
2048 			}
2049 			if (!first)
2050 				err = proc_put_char(&buffer, &left, '\t');
2051 			if (err)
2052 				break;
2053 			err = proc_put_long(&buffer, &left, lval, neg);
2054 			if (err)
2055 				break;
2056 		}
2057 	}
2058 
2059 	if (!write && !first && left && !err)
2060 		err = proc_put_char(&buffer, &left, '\n');
2061 	if (write && !err && left)
2062 		left -= proc_skip_spaces(&kbuf);
2063 free:
2064 	if (write) {
2065 		free_page(page);
2066 		if (first)
2067 			return err ? : -EINVAL;
2068 	}
2069 	*lenp -= left;
2070 out:
2071 	*ppos += *lenp;
2072 	return err;
2073 }
2074 
2075 static int do_proc_dointvec(struct ctl_table *table, int write,
2076 		  void __user *buffer, size_t *lenp, loff_t *ppos,
2077 		  int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2078 			      int write, void *data),
2079 		  void *data)
2080 {
2081 	return __do_proc_dointvec(table->data, table, write,
2082 			buffer, lenp, ppos, conv, data);
2083 }
2084 
2085 /**
2086  * proc_dointvec - read a vector of integers
2087  * @table: the sysctl table
2088  * @write: %TRUE if this is a write to the sysctl file
2089  * @buffer: the user buffer
2090  * @lenp: the size of the user buffer
2091  * @ppos: file position
2092  *
2093  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2094  * values from/to the user buffer, treated as an ASCII string.
2095  *
2096  * Returns 0 on success.
2097  */
2098 int proc_dointvec(struct ctl_table *table, int write,
2099 		     void __user *buffer, size_t *lenp, loff_t *ppos)
2100 {
2101     return do_proc_dointvec(table,write,buffer,lenp,ppos,
2102 		    	    NULL,NULL);
2103 }
2104 
2105 /*
2106  * Taint values can only be increased
2107  * This means we can safely use a temporary.
2108  */
2109 static int proc_taint(struct ctl_table *table, int write,
2110 			       void __user *buffer, size_t *lenp, loff_t *ppos)
2111 {
2112 	struct ctl_table t;
2113 	unsigned long tmptaint = get_taint();
2114 	int err;
2115 
2116 	if (write && !capable(CAP_SYS_ADMIN))
2117 		return -EPERM;
2118 
2119 	t = *table;
2120 	t.data = &tmptaint;
2121 	err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2122 	if (err < 0)
2123 		return err;
2124 
2125 	if (write) {
2126 		/*
2127 		 * Poor man's atomic or. Not worth adding a primitive
2128 		 * to everyone's atomic.h for this
2129 		 */
2130 		int i;
2131 		for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2132 			if ((tmptaint >> i) & 1)
2133 				add_taint(i, LOCKDEP_STILL_OK);
2134 		}
2135 	}
2136 
2137 	return err;
2138 }
2139 
2140 #ifdef CONFIG_PRINTK
2141 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
2142 				void __user *buffer, size_t *lenp, loff_t *ppos)
2143 {
2144 	if (write && !capable(CAP_SYS_ADMIN))
2145 		return -EPERM;
2146 
2147 	return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2148 }
2149 #endif
2150 
2151 struct do_proc_dointvec_minmax_conv_param {
2152 	int *min;
2153 	int *max;
2154 };
2155 
2156 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2157 					int *valp,
2158 					int write, void *data)
2159 {
2160 	struct do_proc_dointvec_minmax_conv_param *param = data;
2161 	if (write) {
2162 		int val = *negp ? -*lvalp : *lvalp;
2163 		if ((param->min && *param->min > val) ||
2164 		    (param->max && *param->max < val))
2165 			return -EINVAL;
2166 		*valp = val;
2167 	} else {
2168 		int val = *valp;
2169 		if (val < 0) {
2170 			*negp = true;
2171 			*lvalp = (unsigned long)-val;
2172 		} else {
2173 			*negp = false;
2174 			*lvalp = (unsigned long)val;
2175 		}
2176 	}
2177 	return 0;
2178 }
2179 
2180 /**
2181  * proc_dointvec_minmax - read a vector of integers with min/max values
2182  * @table: the sysctl table
2183  * @write: %TRUE if this is a write to the sysctl file
2184  * @buffer: the user buffer
2185  * @lenp: the size of the user buffer
2186  * @ppos: file position
2187  *
2188  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2189  * values from/to the user buffer, treated as an ASCII string.
2190  *
2191  * This routine will ensure the values are within the range specified by
2192  * table->extra1 (min) and table->extra2 (max).
2193  *
2194  * Returns 0 on success.
2195  */
2196 int proc_dointvec_minmax(struct ctl_table *table, int write,
2197 		  void __user *buffer, size_t *lenp, loff_t *ppos)
2198 {
2199 	struct do_proc_dointvec_minmax_conv_param param = {
2200 		.min = (int *) table->extra1,
2201 		.max = (int *) table->extra2,
2202 	};
2203 	return do_proc_dointvec(table, write, buffer, lenp, ppos,
2204 				do_proc_dointvec_minmax_conv, &param);
2205 }
2206 
2207 static void validate_coredump_safety(void)
2208 {
2209 #ifdef CONFIG_COREDUMP
2210 	if (suid_dumpable == SUID_DUMP_ROOT &&
2211 	    core_pattern[0] != '/' && core_pattern[0] != '|') {
2212 		printk(KERN_WARNING "Unsafe core_pattern used with "\
2213 			"suid_dumpable=2. Pipe handler or fully qualified "\
2214 			"core dump path required.\n");
2215 	}
2216 #endif
2217 }
2218 
2219 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2220 		void __user *buffer, size_t *lenp, loff_t *ppos)
2221 {
2222 	int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2223 	if (!error)
2224 		validate_coredump_safety();
2225 	return error;
2226 }
2227 
2228 #ifdef CONFIG_COREDUMP
2229 static int proc_dostring_coredump(struct ctl_table *table, int write,
2230 		  void __user *buffer, size_t *lenp, loff_t *ppos)
2231 {
2232 	int error = proc_dostring(table, write, buffer, lenp, ppos);
2233 	if (!error)
2234 		validate_coredump_safety();
2235 	return error;
2236 }
2237 #endif
2238 
2239 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2240 				     void __user *buffer,
2241 				     size_t *lenp, loff_t *ppos,
2242 				     unsigned long convmul,
2243 				     unsigned long convdiv)
2244 {
2245 	unsigned long *i, *min, *max;
2246 	int vleft, first = 1, err = 0;
2247 	unsigned long page = 0;
2248 	size_t left;
2249 	char *kbuf;
2250 
2251 	if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2252 		*lenp = 0;
2253 		return 0;
2254 	}
2255 
2256 	i = (unsigned long *) data;
2257 	min = (unsigned long *) table->extra1;
2258 	max = (unsigned long *) table->extra2;
2259 	vleft = table->maxlen / sizeof(unsigned long);
2260 	left = *lenp;
2261 
2262 	if (write) {
2263 		if (*ppos) {
2264 			switch (sysctl_writes_strict) {
2265 			case SYSCTL_WRITES_STRICT:
2266 				goto out;
2267 			case SYSCTL_WRITES_WARN:
2268 				warn_sysctl_write(table);
2269 				break;
2270 			default:
2271 				break;
2272 			}
2273 		}
2274 
2275 		if (left > PAGE_SIZE - 1)
2276 			left = PAGE_SIZE - 1;
2277 		page = __get_free_page(GFP_TEMPORARY);
2278 		kbuf = (char *) page;
2279 		if (!kbuf)
2280 			return -ENOMEM;
2281 		if (copy_from_user(kbuf, buffer, left)) {
2282 			err = -EFAULT;
2283 			goto free;
2284 		}
2285 		kbuf[left] = 0;
2286 	}
2287 
2288 	for (; left && vleft--; i++, first = 0) {
2289 		unsigned long val;
2290 
2291 		if (write) {
2292 			bool neg;
2293 
2294 			left -= proc_skip_spaces(&kbuf);
2295 
2296 			err = proc_get_long(&kbuf, &left, &val, &neg,
2297 					     proc_wspace_sep,
2298 					     sizeof(proc_wspace_sep), NULL);
2299 			if (err)
2300 				break;
2301 			if (neg)
2302 				continue;
2303 			if ((min && val < *min) || (max && val > *max))
2304 				continue;
2305 			*i = val;
2306 		} else {
2307 			val = convdiv * (*i) / convmul;
2308 			if (!first) {
2309 				err = proc_put_char(&buffer, &left, '\t');
2310 				if (err)
2311 					break;
2312 			}
2313 			err = proc_put_long(&buffer, &left, val, false);
2314 			if (err)
2315 				break;
2316 		}
2317 	}
2318 
2319 	if (!write && !first && left && !err)
2320 		err = proc_put_char(&buffer, &left, '\n');
2321 	if (write && !err)
2322 		left -= proc_skip_spaces(&kbuf);
2323 free:
2324 	if (write) {
2325 		free_page(page);
2326 		if (first)
2327 			return err ? : -EINVAL;
2328 	}
2329 	*lenp -= left;
2330 out:
2331 	*ppos += *lenp;
2332 	return err;
2333 }
2334 
2335 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2336 				     void __user *buffer,
2337 				     size_t *lenp, loff_t *ppos,
2338 				     unsigned long convmul,
2339 				     unsigned long convdiv)
2340 {
2341 	return __do_proc_doulongvec_minmax(table->data, table, write,
2342 			buffer, lenp, ppos, convmul, convdiv);
2343 }
2344 
2345 /**
2346  * proc_doulongvec_minmax - read a vector of long integers with min/max values
2347  * @table: the sysctl table
2348  * @write: %TRUE if this is a write to the sysctl file
2349  * @buffer: the user buffer
2350  * @lenp: the size of the user buffer
2351  * @ppos: file position
2352  *
2353  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2354  * values from/to the user buffer, treated as an ASCII string.
2355  *
2356  * This routine will ensure the values are within the range specified by
2357  * table->extra1 (min) and table->extra2 (max).
2358  *
2359  * Returns 0 on success.
2360  */
2361 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2362 			   void __user *buffer, size_t *lenp, loff_t *ppos)
2363 {
2364     return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2365 }
2366 
2367 /**
2368  * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2369  * @table: the sysctl table
2370  * @write: %TRUE if this is a write to the sysctl file
2371  * @buffer: the user buffer
2372  * @lenp: the size of the user buffer
2373  * @ppos: file position
2374  *
2375  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2376  * values from/to the user buffer, treated as an ASCII string. The values
2377  * are treated as milliseconds, and converted to jiffies when they are stored.
2378  *
2379  * This routine will ensure the values are within the range specified by
2380  * table->extra1 (min) and table->extra2 (max).
2381  *
2382  * Returns 0 on success.
2383  */
2384 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2385 				      void __user *buffer,
2386 				      size_t *lenp, loff_t *ppos)
2387 {
2388     return do_proc_doulongvec_minmax(table, write, buffer,
2389 				     lenp, ppos, HZ, 1000l);
2390 }
2391 
2392 
2393 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2394 					 int *valp,
2395 					 int write, void *data)
2396 {
2397 	if (write) {
2398 		if (*lvalp > LONG_MAX / HZ)
2399 			return 1;
2400 		*valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2401 	} else {
2402 		int val = *valp;
2403 		unsigned long lval;
2404 		if (val < 0) {
2405 			*negp = true;
2406 			lval = (unsigned long)-val;
2407 		} else {
2408 			*negp = false;
2409 			lval = (unsigned long)val;
2410 		}
2411 		*lvalp = lval / HZ;
2412 	}
2413 	return 0;
2414 }
2415 
2416 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2417 						int *valp,
2418 						int write, void *data)
2419 {
2420 	if (write) {
2421 		if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2422 			return 1;
2423 		*valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2424 	} else {
2425 		int val = *valp;
2426 		unsigned long lval;
2427 		if (val < 0) {
2428 			*negp = true;
2429 			lval = (unsigned long)-val;
2430 		} else {
2431 			*negp = false;
2432 			lval = (unsigned long)val;
2433 		}
2434 		*lvalp = jiffies_to_clock_t(lval);
2435 	}
2436 	return 0;
2437 }
2438 
2439 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2440 					    int *valp,
2441 					    int write, void *data)
2442 {
2443 	if (write) {
2444 		unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2445 
2446 		if (jif > INT_MAX)
2447 			return 1;
2448 		*valp = (int)jif;
2449 	} else {
2450 		int val = *valp;
2451 		unsigned long lval;
2452 		if (val < 0) {
2453 			*negp = true;
2454 			lval = (unsigned long)-val;
2455 		} else {
2456 			*negp = false;
2457 			lval = (unsigned long)val;
2458 		}
2459 		*lvalp = jiffies_to_msecs(lval);
2460 	}
2461 	return 0;
2462 }
2463 
2464 /**
2465  * proc_dointvec_jiffies - read a vector of integers as seconds
2466  * @table: the sysctl table
2467  * @write: %TRUE if this is a write to the sysctl file
2468  * @buffer: the user buffer
2469  * @lenp: the size of the user buffer
2470  * @ppos: file position
2471  *
2472  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2473  * values from/to the user buffer, treated as an ASCII string.
2474  * The values read are assumed to be in seconds, and are converted into
2475  * jiffies.
2476  *
2477  * Returns 0 on success.
2478  */
2479 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2480 			  void __user *buffer, size_t *lenp, loff_t *ppos)
2481 {
2482     return do_proc_dointvec(table,write,buffer,lenp,ppos,
2483 		    	    do_proc_dointvec_jiffies_conv,NULL);
2484 }
2485 
2486 /**
2487  * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2488  * @table: the sysctl table
2489  * @write: %TRUE if this is a write to the sysctl file
2490  * @buffer: the user buffer
2491  * @lenp: the size of the user buffer
2492  * @ppos: pointer to the file position
2493  *
2494  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2495  * values from/to the user buffer, treated as an ASCII string.
2496  * The values read are assumed to be in 1/USER_HZ seconds, and
2497  * are converted into jiffies.
2498  *
2499  * Returns 0 on success.
2500  */
2501 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2502 				 void __user *buffer, size_t *lenp, loff_t *ppos)
2503 {
2504     return do_proc_dointvec(table,write,buffer,lenp,ppos,
2505 		    	    do_proc_dointvec_userhz_jiffies_conv,NULL);
2506 }
2507 
2508 /**
2509  * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2510  * @table: the sysctl table
2511  * @write: %TRUE if this is a write to the sysctl file
2512  * @buffer: the user buffer
2513  * @lenp: the size of the user buffer
2514  * @ppos: file position
2515  * @ppos: the current position in the file
2516  *
2517  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2518  * values from/to the user buffer, treated as an ASCII string.
2519  * The values read are assumed to be in 1/1000 seconds, and
2520  * are converted into jiffies.
2521  *
2522  * Returns 0 on success.
2523  */
2524 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2525 			     void __user *buffer, size_t *lenp, loff_t *ppos)
2526 {
2527 	return do_proc_dointvec(table, write, buffer, lenp, ppos,
2528 				do_proc_dointvec_ms_jiffies_conv, NULL);
2529 }
2530 
2531 static int proc_do_cad_pid(struct ctl_table *table, int write,
2532 			   void __user *buffer, size_t *lenp, loff_t *ppos)
2533 {
2534 	struct pid *new_pid;
2535 	pid_t tmp;
2536 	int r;
2537 
2538 	tmp = pid_vnr(cad_pid);
2539 
2540 	r = __do_proc_dointvec(&tmp, table, write, buffer,
2541 			       lenp, ppos, NULL, NULL);
2542 	if (r || !write)
2543 		return r;
2544 
2545 	new_pid = find_get_pid(tmp);
2546 	if (!new_pid)
2547 		return -ESRCH;
2548 
2549 	put_pid(xchg(&cad_pid, new_pid));
2550 	return 0;
2551 }
2552 
2553 /**
2554  * proc_do_large_bitmap - read/write from/to a large bitmap
2555  * @table: the sysctl table
2556  * @write: %TRUE if this is a write to the sysctl file
2557  * @buffer: the user buffer
2558  * @lenp: the size of the user buffer
2559  * @ppos: file position
2560  *
2561  * The bitmap is stored at table->data and the bitmap length (in bits)
2562  * in table->maxlen.
2563  *
2564  * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2565  * large bitmaps may be represented in a compact manner. Writing into
2566  * the file will clear the bitmap then update it with the given input.
2567  *
2568  * Returns 0 on success.
2569  */
2570 int proc_do_large_bitmap(struct ctl_table *table, int write,
2571 			 void __user *buffer, size_t *lenp, loff_t *ppos)
2572 {
2573 	int err = 0;
2574 	bool first = 1;
2575 	size_t left = *lenp;
2576 	unsigned long bitmap_len = table->maxlen;
2577 	unsigned long *bitmap = *(unsigned long **) table->data;
2578 	unsigned long *tmp_bitmap = NULL;
2579 	char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2580 
2581 	if (!bitmap || !bitmap_len || !left || (*ppos && !write)) {
2582 		*lenp = 0;
2583 		return 0;
2584 	}
2585 
2586 	if (write) {
2587 		unsigned long page = 0;
2588 		char *kbuf;
2589 
2590 		if (left > PAGE_SIZE - 1)
2591 			left = PAGE_SIZE - 1;
2592 
2593 		page = __get_free_page(GFP_TEMPORARY);
2594 		kbuf = (char *) page;
2595 		if (!kbuf)
2596 			return -ENOMEM;
2597 		if (copy_from_user(kbuf, buffer, left)) {
2598 			free_page(page);
2599 			return -EFAULT;
2600                 }
2601 		kbuf[left] = 0;
2602 
2603 		tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
2604 				     GFP_KERNEL);
2605 		if (!tmp_bitmap) {
2606 			free_page(page);
2607 			return -ENOMEM;
2608 		}
2609 		proc_skip_char(&kbuf, &left, '\n');
2610 		while (!err && left) {
2611 			unsigned long val_a, val_b;
2612 			bool neg;
2613 
2614 			err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a,
2615 					     sizeof(tr_a), &c);
2616 			if (err)
2617 				break;
2618 			if (val_a >= bitmap_len || neg) {
2619 				err = -EINVAL;
2620 				break;
2621 			}
2622 
2623 			val_b = val_a;
2624 			if (left) {
2625 				kbuf++;
2626 				left--;
2627 			}
2628 
2629 			if (c == '-') {
2630 				err = proc_get_long(&kbuf, &left, &val_b,
2631 						     &neg, tr_b, sizeof(tr_b),
2632 						     &c);
2633 				if (err)
2634 					break;
2635 				if (val_b >= bitmap_len || neg ||
2636 				    val_a > val_b) {
2637 					err = -EINVAL;
2638 					break;
2639 				}
2640 				if (left) {
2641 					kbuf++;
2642 					left--;
2643 				}
2644 			}
2645 
2646 			bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
2647 			first = 0;
2648 			proc_skip_char(&kbuf, &left, '\n');
2649 		}
2650 		free_page(page);
2651 	} else {
2652 		unsigned long bit_a, bit_b = 0;
2653 
2654 		while (left) {
2655 			bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
2656 			if (bit_a >= bitmap_len)
2657 				break;
2658 			bit_b = find_next_zero_bit(bitmap, bitmap_len,
2659 						   bit_a + 1) - 1;
2660 
2661 			if (!first) {
2662 				err = proc_put_char(&buffer, &left, ',');
2663 				if (err)
2664 					break;
2665 			}
2666 			err = proc_put_long(&buffer, &left, bit_a, false);
2667 			if (err)
2668 				break;
2669 			if (bit_a != bit_b) {
2670 				err = proc_put_char(&buffer, &left, '-');
2671 				if (err)
2672 					break;
2673 				err = proc_put_long(&buffer, &left, bit_b, false);
2674 				if (err)
2675 					break;
2676 			}
2677 
2678 			first = 0; bit_b++;
2679 		}
2680 		if (!err)
2681 			err = proc_put_char(&buffer, &left, '\n');
2682 	}
2683 
2684 	if (!err) {
2685 		if (write) {
2686 			if (*ppos)
2687 				bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
2688 			else
2689 				bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
2690 		}
2691 		kfree(tmp_bitmap);
2692 		*lenp -= left;
2693 		*ppos += *lenp;
2694 		return 0;
2695 	} else {
2696 		kfree(tmp_bitmap);
2697 		return err;
2698 	}
2699 }
2700 
2701 #else /* CONFIG_PROC_SYSCTL */
2702 
2703 int proc_dostring(struct ctl_table *table, int write,
2704 		  void __user *buffer, size_t *lenp, loff_t *ppos)
2705 {
2706 	return -ENOSYS;
2707 }
2708 
2709 int proc_dointvec(struct ctl_table *table, int write,
2710 		  void __user *buffer, size_t *lenp, loff_t *ppos)
2711 {
2712 	return -ENOSYS;
2713 }
2714 
2715 int proc_dointvec_minmax(struct ctl_table *table, int write,
2716 		    void __user *buffer, size_t *lenp, loff_t *ppos)
2717 {
2718 	return -ENOSYS;
2719 }
2720 
2721 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2722 		    void __user *buffer, size_t *lenp, loff_t *ppos)
2723 {
2724 	return -ENOSYS;
2725 }
2726 
2727 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2728 		    void __user *buffer, size_t *lenp, loff_t *ppos)
2729 {
2730 	return -ENOSYS;
2731 }
2732 
2733 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2734 			     void __user *buffer, size_t *lenp, loff_t *ppos)
2735 {
2736 	return -ENOSYS;
2737 }
2738 
2739 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2740 		    void __user *buffer, size_t *lenp, loff_t *ppos)
2741 {
2742 	return -ENOSYS;
2743 }
2744 
2745 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2746 				      void __user *buffer,
2747 				      size_t *lenp, loff_t *ppos)
2748 {
2749     return -ENOSYS;
2750 }
2751 
2752 
2753 #endif /* CONFIG_PROC_SYSCTL */
2754 
2755 /*
2756  * No sense putting this after each symbol definition, twice,
2757  * exception granted :-)
2758  */
2759 EXPORT_SYMBOL(proc_dointvec);
2760 EXPORT_SYMBOL(proc_dointvec_jiffies);
2761 EXPORT_SYMBOL(proc_dointvec_minmax);
2762 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2763 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2764 EXPORT_SYMBOL(proc_dostring);
2765 EXPORT_SYMBOL(proc_doulongvec_minmax);
2766 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
2767