sysctl.c 69.4 KB
Newer Older
Linus Torvalds's avatar
Linus Torvalds committed
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25
/*
 * sysctl.c: General linux system control interface
 *
 * Begun 24 March 1995, Stephen Tweedie
 * Added /proc support, Dec 1995
 * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
 * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
 * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
 * Dynamic registration fixes, Stephen Tweedie.
 * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
 * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
 *  Horn.
 * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
 * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
 * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
 *  Wendling.
 * The list_for_each() macro wasn't appropriate for the sysctl loop.
 *  Removed it and replaced it with older style, 03/23/00, Bill Wendling
 */

#include <linux/module.h>
#include <linux/mm.h>
#include <linux/swap.h>
#include <linux/slab.h>
#include <linux/sysctl.h>
Dave Young's avatar
Dave Young committed
26
#include <linux/signal.h>
27
#include <linux/printk.h>
Linus Torvalds's avatar
Linus Torvalds committed
28
#include <linux/proc_fs.h>
29
#include <linux/security.h>
Linus Torvalds's avatar
Linus Torvalds committed
30
#include <linux/ctype.h>
31
#include <linux/kmemcheck.h>
32
#include <linux/fs.h>
Linus Torvalds's avatar
Linus Torvalds committed
33 34
#include <linux/init.h>
#include <linux/kernel.h>
35
#include <linux/kobject.h>
36
#include <linux/net.h>
Linus Torvalds's avatar
Linus Torvalds committed
37 38 39
#include <linux/sysrq.h>
#include <linux/highuid.h>
#include <linux/writeback.h>
40
#include <linux/ratelimit.h>
41
#include <linux/compaction.h>
Linus Torvalds's avatar
Linus Torvalds committed
42 43
#include <linux/hugetlb.h>
#include <linux/initrd.h>
44
#include <linux/key.h>
Linus Torvalds's avatar
Linus Torvalds committed
45 46 47
#include <linux/times.h>
#include <linux/limits.h>
#include <linux/dcache.h>
48
#include <linux/dnotify.h>
Linus Torvalds's avatar
Linus Torvalds committed
49
#include <linux/syscalls.h>
Adrian Bunk's avatar
Adrian Bunk committed
50
#include <linux/vmstat.h>
51 52
#include <linux/nfs_fs.h>
#include <linux/acpi.h>
53
#include <linux/reboot.h>
54
#include <linux/ftrace.h>
55
#include <linux/perf_event.h>
56
#include <linux/kprobes.h>
57
#include <linux/pipe_fs_i.h>
58
#include <linux/oom.h>
59
#include <linux/kmod.h>
60
#include <linux/capability.h>
Al Viro's avatar
Al Viro committed
61
#include <linux/binfmts.h>
Linus Torvalds's avatar
Linus Torvalds committed
62 63 64 65

#include <asm/uaccess.h>
#include <asm/processor.h>

66 67
#ifdef CONFIG_X86
#include <asm/nmi.h>
68
#include <asm/stacktrace.h>
69
#include <asm/io.h>
70
#endif
Dave Young's avatar
Dave Young committed
71 72 73
#ifdef CONFIG_BSD_PROCESS_ACCT
#include <linux/acct.h>
#endif
Dave Young's avatar
Dave Young committed
74 75 76
#ifdef CONFIG_RT_MUTEXES
#include <linux/rtmutex.h>
#endif
Dave Young's avatar
Dave Young committed
77 78 79
#if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
#include <linux/lockdep.h>
#endif
Dave Young's avatar
Dave Young committed
80 81 82
#ifdef CONFIG_CHR_DEV_SG
#include <scsi/sg.h>
#endif
83

84
#ifdef CONFIG_LOCKUP_DETECTOR
85 86 87
#include <linux/nmi.h>
#endif

88

Linus Torvalds's avatar
Linus Torvalds committed
89 90 91 92 93 94 95
#if defined(CONFIG_SYSCTL)

/* External variables not in a header file. */
extern int sysctl_overcommit_memory;
extern int sysctl_overcommit_ratio;
extern int max_threads;
extern int core_uses_pid;
Alan Cox's avatar
Alan Cox committed
96
extern int suid_dumpable;
Linus Torvalds's avatar
Linus Torvalds committed
97
extern char core_pattern[];
98
extern unsigned int core_pipe_limit;
Linus Torvalds's avatar
Linus Torvalds committed
99 100 101
extern int pid_max;
extern int min_free_kbytes;
extern int pid_max_min, pid_max_max;
Andrew Morton's avatar
Andrew Morton committed
102
extern int sysctl_drop_caches;
103
extern int percpu_pagelist_fraction;
104
extern int compat_log;
Arjan van de Ven's avatar
Arjan van de Ven committed
105
extern int latencytop_enabled;
106
extern int sysctl_nr_open_min, sysctl_nr_open_max;
107 108 109
#ifndef CONFIG_MMU
extern int sysctl_nr_trim_pages;
#endif
110
#ifdef CONFIG_BLOCK
111
extern int blk_iopoll_enabled;
112
#endif
Linus Torvalds's avatar
Linus Torvalds committed
113

114
/* Constants used for minimum and  maximum */
115
#ifdef CONFIG_LOCKUP_DETECTOR
116
static int sixty = 60;
117
static int neg_one = -1;
118 119 120
#endif

static int zero;
121 122
static int __maybe_unused one = 1;
static int __maybe_unused two = 2;
123
static int __maybe_unused three = 3;
124
static unsigned long one_ul = 1;
125
static int one_hundred = 100;
126 127 128
#ifdef CONFIG_PRINTK
static int ten_thousand = 10000;
#endif
129

130 131 132
/* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;

Linus Torvalds's avatar
Linus Torvalds committed
133 134 135
/* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
static int maxolduid = 65535;
static int minolduid;
136
static int min_percpu_pagelist_fract = 8;
Linus Torvalds's avatar
Linus Torvalds committed
137 138

static int ngroups_max = NGROUPS_MAX;
139
static const int cap_last_cap = CAP_LAST_CAP;
Linus Torvalds's avatar
Linus Torvalds committed
140

Dave Young's avatar
Dave Young committed
141 142 143
#ifdef CONFIG_INOTIFY_USER
#include <linux/inotify.h>
#endif
144
#ifdef CONFIG_SPARC
145
#include <asm/system.h>
Linus Torvalds's avatar
Linus Torvalds committed
146 147
#endif

148 149 150 151
#ifdef CONFIG_SPARC64
extern int sysctl_tsb_ratio;
#endif

Linus Torvalds's avatar
Linus Torvalds committed
152 153 154 155 156
#ifdef __hppa__
extern int pwrsw_enabled;
extern int unaligned_enabled;
#endif

157 158
#ifdef CONFIG_IA64
extern int no_unaligned_warning;
159
extern int unaligned_dump_stack;
160 161
#endif

162
#ifdef CONFIG_PROC_SYSCTL
163
static int proc_do_cad_pid(struct ctl_table *table, int write,
164
		  void __user *buffer, size_t *lenp, loff_t *ppos);
165
static int proc_taint(struct ctl_table *table, int write,
166
			       void __user *buffer, size_t *lenp, loff_t *ppos);
167
#endif
168

169 170 171 172 173
#ifdef CONFIG_PRINTK
static int proc_dmesg_restrict(struct ctl_table *table, int write,
				void __user *buffer, size_t *lenp, loff_t *ppos);
#endif

174
#ifdef CONFIG_MAGIC_SYSRQ
175 176
/* Note: sysrq code uses it's own private copy */
static int __sysrq_enabled = SYSRQ_DEFAULT_ENABLE;
177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195

static int sysrq_sysctl_handler(ctl_table *table, int write,
				void __user *buffer, size_t *lenp,
				loff_t *ppos)
{
	int error;

	error = proc_dointvec(table, write, buffer, lenp, ppos);
	if (error)
		return error;

	if (write)
		sysrq_toggle_support(__sysrq_enabled);

	return 0;
}

#endif

196
static struct ctl_table root_table[];
197 198
static struct ctl_table_root sysctl_table_root;
static struct ctl_table_header root_table_header = {
Al Viro's avatar
Al Viro committed
199
	{{.count = 1,
200
	.ctl_table = root_table,
Al Viro's avatar
Al Viro committed
201
	.ctl_entry = LIST_HEAD_INIT(sysctl_table_root.default_set.list),}},
202
	.root = &sysctl_table_root,
203
	.set = &sysctl_table_root.default_set,
204 205 206
};
static struct ctl_table_root sysctl_table_root = {
	.root_list = LIST_HEAD_INIT(sysctl_table_root.root_list),
207
	.default_set.list = LIST_HEAD_INIT(root_table_header.ctl_entry),
208
};
Linus Torvalds's avatar
Linus Torvalds committed
209

210 211 212 213 214 215
static struct ctl_table kern_table[];
static struct ctl_table vm_table[];
static struct ctl_table fs_table[];
static struct ctl_table debug_table[];
static struct ctl_table dev_table[];
extern struct ctl_table random_table[];
216 217 218
#ifdef CONFIG_EPOLL
extern struct ctl_table epoll_table[];
#endif
Linus Torvalds's avatar
Linus Torvalds committed
219 220 221 222 223 224 225

#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
int sysctl_legacy_va_layout;
#endif

/* The default sysctl tables: */

226
static struct ctl_table root_table[] = {
Linus Torvalds's avatar
Linus Torvalds committed
227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251
	{
		.procname	= "kernel",
		.mode		= 0555,
		.child		= kern_table,
	},
	{
		.procname	= "vm",
		.mode		= 0555,
		.child		= vm_table,
	},
	{
		.procname	= "fs",
		.mode		= 0555,
		.child		= fs_table,
	},
	{
		.procname	= "debug",
		.mode		= 0555,
		.child		= debug_table,
	},
	{
		.procname	= "dev",
		.mode		= 0555,
		.child		= dev_table,
	},
252
	{ }
Linus Torvalds's avatar
Linus Torvalds committed
253 254
};

Ingo Molnar's avatar
Ingo Molnar committed
255
#ifdef CONFIG_SCHED_DEBUG
256 257 258 259
static int min_sched_granularity_ns = 100000;		/* 100 usecs */
static int max_sched_granularity_ns = NSEC_PER_SEC;	/* 1 second */
static int min_wakeup_granularity_ns;			/* 0 usecs */
static int max_wakeup_granularity_ns = NSEC_PER_SEC;	/* 1 second */
260 261
static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
Ingo Molnar's avatar
Ingo Molnar committed
262 263
#endif

264 265 266 267 268
#ifdef CONFIG_COMPACTION
static int min_extfrag_threshold;
static int max_extfrag_threshold = 1000;
#endif

269
static struct ctl_table kern_table[] = {
270 271 272 273 274
	{
		.procname	= "sched_child_runs_first",
		.data		= &sysctl_sched_child_runs_first,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
275
		.proc_handler	= proc_dointvec,
276
	},
Ingo Molnar's avatar
Ingo Molnar committed
277 278
#ifdef CONFIG_SCHED_DEBUG
	{
279 280
		.procname	= "sched_min_granularity_ns",
		.data		= &sysctl_sched_min_granularity,
Ingo Molnar's avatar
Ingo Molnar committed
281 282
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
283
		.proc_handler	= sched_proc_update_handler,
284 285
		.extra1		= &min_sched_granularity_ns,
		.extra2		= &max_sched_granularity_ns,
Ingo Molnar's avatar
Ingo Molnar committed
286
	},
287 288 289 290 291
	{
		.procname	= "sched_latency_ns",
		.data		= &sysctl_sched_latency,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
292
		.proc_handler	= sched_proc_update_handler,
293 294 295
		.extra1		= &min_sched_granularity_ns,
		.extra2		= &max_sched_granularity_ns,
	},
Ingo Molnar's avatar
Ingo Molnar committed
296 297 298 299 300
	{
		.procname	= "sched_wakeup_granularity_ns",
		.data		= &sysctl_sched_wakeup_granularity,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
301
		.proc_handler	= sched_proc_update_handler,
Ingo Molnar's avatar
Ingo Molnar committed
302 303 304
		.extra1		= &min_wakeup_granularity_ns,
		.extra2		= &max_wakeup_granularity_ns,
	},
305 306 307 308 309
	{
		.procname	= "sched_tunable_scaling",
		.data		= &sysctl_sched_tunable_scaling,
		.maxlen		= sizeof(enum sched_tunable_scaling),
		.mode		= 0644,
310
		.proc_handler	= sched_proc_update_handler,
311 312
		.extra1		= &min_sched_tunable_scaling,
		.extra2		= &max_sched_tunable_scaling,
313
	},
314 315 316 317 318
	{
		.procname	= "sched_migration_cost",
		.data		= &sysctl_sched_migration_cost,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
319
		.proc_handler	= proc_dointvec,
320
	},
321 322 323 324
	{
		.procname	= "sched_nr_migrate",
		.data		= &sysctl_sched_nr_migrate,
		.maxlen		= sizeof(unsigned int),
Peter Zijlstra's avatar
Peter Zijlstra committed
325
		.mode		= 0644,
326
		.proc_handler	= proc_dointvec,
Peter Zijlstra's avatar
Peter Zijlstra committed
327
	},
328 329 330 331 332
	{
		.procname	= "sched_time_avg",
		.data		= &sysctl_sched_time_avg,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
333
		.proc_handler	= proc_dointvec,
334
	},
335 336 337 338 339 340 341
	{
		.procname	= "sched_shares_window",
		.data		= &sysctl_sched_shares_window,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
		.proc_handler	= proc_dointvec,
	},
342 343 344 345 346
	{
		.procname	= "timer_migration",
		.data		= &sysctl_timer_migration,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
347
		.proc_handler	= proc_dointvec_minmax,
348 349
		.extra1		= &zero,
		.extra2		= &one,
Peter Zijlstra's avatar
Peter Zijlstra committed
350
	},
351
#endif
Peter Zijlstra's avatar
Peter Zijlstra committed
352 353 354 355 356
	{
		.procname	= "sched_rt_period_us",
		.data		= &sysctl_sched_rt_period,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
357
		.proc_handler	= sched_rt_handler,
Peter Zijlstra's avatar
Peter Zijlstra committed
358 359 360 361 362 363
	},
	{
		.procname	= "sched_rt_runtime_us",
		.data		= &sysctl_sched_rt_runtime,
		.maxlen		= sizeof(int),
		.mode		= 0644,
364
		.proc_handler	= sched_rt_handler,
Peter Zijlstra's avatar
Peter Zijlstra committed
365
	},
366 367 368 369 370 371
#ifdef CONFIG_SCHED_AUTOGROUP
	{
		.procname	= "sched_autogroup_enabled",
		.data		= &sysctl_sched_autogroup_enabled,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
372
		.proc_handler	= proc_dointvec_minmax,
373 374 375 376
		.extra1		= &zero,
		.extra2		= &one,
	},
#endif
377 378 379 380 381 382 383 384 385 386
#ifdef CONFIG_CFS_BANDWIDTH
	{
		.procname	= "sched_cfs_bandwidth_slice_us",
		.data		= &sysctl_sched_cfs_bandwidth_slice,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
		.proc_handler	= proc_dointvec_minmax,
		.extra1		= &one,
	},
#endif
Peter Zijlstra's avatar
Peter Zijlstra committed
387 388 389 390 391 392
#ifdef CONFIG_PROVE_LOCKING
	{
		.procname	= "prove_locking",
		.data		= &prove_locking,
		.maxlen		= sizeof(int),
		.mode		= 0644,
393
		.proc_handler	= proc_dointvec,
Peter Zijlstra's avatar
Peter Zijlstra committed
394 395 396 397 398 399 400 401
	},
#endif
#ifdef CONFIG_LOCK_STAT
	{
		.procname	= "lock_stat",
		.data		= &lock_stat,
		.maxlen		= sizeof(int),
		.mode		= 0644,
402
		.proc_handler	= proc_dointvec,
Peter Zijlstra's avatar
Peter Zijlstra committed
403
	},
Ingo Molnar's avatar
Ingo Molnar committed
404
#endif
Linus Torvalds's avatar
Linus Torvalds committed
405 406 407 408 409
	{
		.procname	= "panic",
		.data		= &panic_timeout,
		.maxlen		= sizeof(int),
		.mode		= 0644,
410
		.proc_handler	= proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
411 412 413 414 415 416
	},
	{
		.procname	= "core_uses_pid",
		.data		= &core_uses_pid,
		.maxlen		= sizeof(int),
		.mode		= 0644,
417
		.proc_handler	= proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
418 419 420 421
	},
	{
		.procname	= "core_pattern",
		.data		= core_pattern,
422
		.maxlen		= CORENAME_MAX_SIZE,
Linus Torvalds's avatar
Linus Torvalds committed
423
		.mode		= 0644,
424
		.proc_handler	= proc_dostring,
Linus Torvalds's avatar
Linus Torvalds committed
425
	},
426 427 428 429 430
	{
		.procname	= "core_pipe_limit",
		.data		= &core_pipe_limit,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
431
		.proc_handler	= proc_dointvec,
432
	},
433
#ifdef CONFIG_PROC_SYSCTL
Linus Torvalds's avatar
Linus Torvalds committed
434 435
	{
		.procname	= "tainted",
Andi Kleen's avatar
Andi Kleen committed
436
		.maxlen 	= sizeof(long),
437
		.mode		= 0644,
438
		.proc_handler	= proc_taint,
Linus Torvalds's avatar
Linus Torvalds committed
439
	},
440
#endif
Arjan van de Ven's avatar
Arjan van de Ven committed
441 442 443 444 445 446
#ifdef CONFIG_LATENCYTOP
	{
		.procname	= "latencytop",
		.data		= &latencytop_enabled,
		.maxlen		= sizeof(int),
		.mode		= 0644,
447
		.proc_handler	= proc_dointvec,
Arjan van de Ven's avatar
Arjan van de Ven committed
448 449
	},
#endif
Linus Torvalds's avatar
Linus Torvalds committed
450 451 452 453 454 455
#ifdef CONFIG_BLK_DEV_INITRD
	{
		.procname	= "real-root-dev",
		.data		= &real_root_dev,
		.maxlen		= sizeof(int),
		.mode		= 0644,
456
		.proc_handler	= proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
457 458
	},
#endif
Ingo Molnar's avatar
Ingo Molnar committed
459 460 461 462 463
	{
		.procname	= "print-fatal-signals",
		.data		= &print_fatal_signals,
		.maxlen		= sizeof(int),
		.mode		= 0644,
464
		.proc_handler	= proc_dointvec,
Ingo Molnar's avatar
Ingo Molnar committed
465
	},
466
#ifdef CONFIG_SPARC
Linus Torvalds's avatar
Linus Torvalds committed
467 468 469 470 471
	{
		.procname	= "reboot-cmd",
		.data		= reboot_command,
		.maxlen		= 256,
		.mode		= 0644,
472
		.proc_handler	= proc_dostring,
Linus Torvalds's avatar
Linus Torvalds committed
473 474 475 476 477 478
	},
	{
		.procname	= "stop-a",
		.data		= &stop_a_enabled,
		.maxlen		= sizeof (int),
		.mode		= 0644,
479
		.proc_handler	= proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
480 481 482 483 484 485
	},
	{
		.procname	= "scons-poweroff",
		.data		= &scons_pwroff,
		.maxlen		= sizeof (int),
		.mode		= 0644,
486
		.proc_handler	= proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
487 488
	},
#endif
489 490 491 492 493 494
#ifdef CONFIG_SPARC64
	{
		.procname	= "tsb-ratio",
		.data		= &sysctl_tsb_ratio,
		.maxlen		= sizeof (int),
		.mode		= 0644,
495
		.proc_handler	= proc_dointvec,
496 497
	},
#endif
Linus Torvalds's avatar
Linus Torvalds committed
498 499 500 501 502 503
#ifdef __hppa__
	{
		.procname	= "soft-power",
		.data		= &pwrsw_enabled,
		.maxlen		= sizeof (int),
	 	.mode		= 0644,
504
		.proc_handler	= proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
505 506 507 508 509 510
	},
	{
		.procname	= "unaligned-trap",
		.data		= &unaligned_enabled,
		.maxlen		= sizeof (int),
		.mode		= 0644,
511
		.proc_handler	= proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
512 513 514 515 516 517 518
	},
#endif
	{
		.procname	= "ctrl-alt-del",
		.data		= &C_A_D,
		.maxlen		= sizeof(int),
		.mode		= 0644,
519
		.proc_handler	= proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
520
	},
521
#ifdef CONFIG_FUNCTION_TRACER
522 523 524 525 526
	{
		.procname	= "ftrace_enabled",
		.data		= &ftrace_enabled,
		.maxlen		= sizeof(int),
		.mode		= 0644,
527
		.proc_handler	= ftrace_enable_sysctl,
528 529
	},
#endif
530 531 532 533 534 535
#ifdef CONFIG_STACK_TRACER
	{
		.procname	= "stack_tracer_enabled",
		.data		= &stack_tracer_enabled,
		.maxlen		= sizeof(int),
		.mode		= 0644,
536
		.proc_handler	= stack_trace_sysctl,
537 538
	},
#endif
539 540
#ifdef CONFIG_TRACING
	{
Peter Zijlstra's avatar
Peter Zijlstra committed
541
		.procname	= "ftrace_dump_on_oops",
542 543 544
		.data		= &ftrace_dump_on_oops,
		.maxlen		= sizeof(int),
		.mode		= 0644,
545
		.proc_handler	= proc_dointvec,
546 547
	},
#endif
548
#ifdef CONFIG_MODULES
Linus Torvalds's avatar
Linus Torvalds committed
549 550 551 552 553
	{
		.procname	= "modprobe",
		.data		= &modprobe_path,
		.maxlen		= KMOD_PATH_LEN,
		.mode		= 0644,
554
		.proc_handler	= proc_dostring,
Linus Torvalds's avatar
Linus Torvalds committed
555
	},
556 557 558 559 560 561
	{
		.procname	= "modules_disabled",
		.data		= &modules_disabled,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		/* only handle a transition from default "0" to "1" */
562
		.proc_handler	= proc_dointvec_minmax,
563 564 565
		.extra1		= &one,
		.extra2		= &one,
	},
Linus Torvalds's avatar
Linus Torvalds committed
566
#endif
567
#ifdef CONFIG_HOTPLUG
Linus Torvalds's avatar
Linus Torvalds committed
568 569
	{
		.procname	= "hotplug",
570 571
		.data		= &uevent_helper,
		.maxlen		= UEVENT_HELPER_PATH_LEN,
Linus Torvalds's avatar
Linus Torvalds committed
572
		.mode		= 0644,
573
		.proc_handler	= proc_dostring,
Linus Torvalds's avatar
Linus Torvalds committed
574 575 576 577 578 579 580 581
	},
#endif
#ifdef CONFIG_CHR_DEV_SG
	{
		.procname	= "sg-big-buff",
		.data		= &sg_big_buff,
		.maxlen		= sizeof (int),
		.mode		= 0444,
582
		.proc_handler	= proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
583 584 585 586 587 588 589 590
	},
#endif
#ifdef CONFIG_BSD_PROCESS_ACCT
	{
		.procname	= "acct",
		.data		= &acct_parm,
		.maxlen		= 3*sizeof(int),
		.mode		= 0644,
591
		.proc_handler	= proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
592 593 594 595 596
	},
#endif
#ifdef CONFIG_MAGIC_SYSRQ
	{
		.procname	= "sysrq",
597
		.data		= &__sysrq_enabled,
Linus Torvalds's avatar
Linus Torvalds committed
598 599
		.maxlen		= sizeof (int),
		.mode		= 0644,
600
		.proc_handler	= sysrq_sysctl_handler,
Linus Torvalds's avatar
Linus Torvalds committed
601 602
	},
#endif
603
#ifdef CONFIG_PROC_SYSCTL
Linus Torvalds's avatar
Linus Torvalds committed
604 605
	{
		.procname	= "cad_pid",
606
		.data		= NULL,
Linus Torvalds's avatar
Linus Torvalds committed
607 608
		.maxlen		= sizeof (int),
		.mode		= 0600,
609
		.proc_handler	= proc_do_cad_pid,
Linus Torvalds's avatar
Linus Torvalds committed
610
	},
611
#endif
Linus Torvalds's avatar
Linus Torvalds committed
612 613 614 615 616
	{
		.procname	= "threads-max",
		.data		= &max_threads,
		.maxlen		= sizeof(int),
		.mode		= 0644,
617
		.proc_handler	= proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
618 619 620 621 622 623
	},
	{
		.procname	= "random",
		.mode		= 0555,
		.child		= random_table,
	},
624 625 626 627 628
	{
		.procname	= "usermodehelper",
		.mode		= 0555,
		.child		= usermodehelper_table,
	},
Linus Torvalds's avatar
Linus Torvalds committed
629 630 631 632 633
	{
		.procname	= "overflowuid",
		.data		= &overflowuid,
		.maxlen		= sizeof(int),
		.mode		= 0644,
634
		.proc_handler	= proc_dointvec_minmax,
Linus Torvalds's avatar
Linus Torvalds committed
635 636 637 638 639 640 641 642
		.extra1		= &minolduid,
		.extra2		= &maxolduid,
	},
	{
		.procname	= "overflowgid",
		.data		= &overflowgid,
		.maxlen		= sizeof(int),
		.mode		= 0644,
643
		.proc_handler	= proc_dointvec_minmax,
Linus Torvalds's avatar
Linus Torvalds committed
644 645 646
		.extra1		= &minolduid,
		.extra2		= &maxolduid,
	},
647
#ifdef CONFIG_S390
Linus Torvalds's avatar
Linus Torvalds committed
648 649 650 651 652 653
#ifdef CONFIG_MATHEMU
	{
		.procname	= "ieee_emulation_warnings",
		.data		= &sysctl_ieee_emulation_warnings,
		.maxlen		= sizeof(int),
		.mode		= 0644,
654
		.proc_handler	= proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
655 656 657 658
	},
#endif
	{
		.procname	= "userprocess_debug",
659
		.data		= &show_unhandled_signals,
Linus Torvalds's avatar
Linus Torvalds committed
660 661
		.maxlen		= sizeof(int),
		.mode		= 0644,
662
		.proc_handler	= proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
663 664 665 666 667 668 669
	},
#endif
	{
		.procname	= "pid_max",
		.data		= &pid_max,
		.maxlen		= sizeof (int),
		.mode		= 0644,
670
		.proc_handler	= proc_dointvec_minmax,
Linus Torvalds's avatar
Linus Torvalds committed
671 672 673 674 675 676 677 678
		.extra1		= &pid_max_min,
		.extra2		= &pid_max_max,
	},
	{
		.procname	= "panic_on_oops",
		.data		= &panic_on_oops,
		.maxlen		= sizeof(int),
		.mode		= 0644,
679
		.proc_handler	= proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
680
	},
681 682 683 684 685 686
#if defined CONFIG_PRINTK
	{
		.procname	= "printk",
		.data		= &console_loglevel,
		.maxlen		= 4*sizeof(int),
		.mode		= 0644,
687
		.proc_handler	= proc_dointvec,
688
	},
Linus Torvalds's avatar
Linus Torvalds committed
689 690
	{
		.procname	= "printk_ratelimit",
Dave Young's avatar
Dave Young committed
691
		.data		= &printk_ratelimit_state.interval,
Linus Torvalds's avatar
Linus Torvalds committed
692 693
		.maxlen		= sizeof(int),
		.mode		= 0644,
694
		.proc_handler	= proc_dointvec_jiffies,
Linus Torvalds's avatar
Linus Torvalds committed
695 696 697
	},
	{
		.procname	= "printk_ratelimit_burst",
Dave Young's avatar
Dave Young committed
698
		.data		= &printk_ratelimit_state.burst,
Linus Torvalds's avatar
Linus Torvalds committed
699 700
		.maxlen		= sizeof(int),
		.mode		= 0644,
701
		.proc_handler	= proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
702
	},
703 704 705 706 707
	{
		.procname	= "printk_delay",
		.data		= &printk_delay_msec,
		.maxlen		= sizeof(int),
		.mode		= 0644,
708
		.proc_handler	= proc_dointvec_minmax,
709 710 711
		.extra1		= &zero,
		.extra2		= &ten_thousand,
	},
712 713 714 715 716 717 718 719 720
	{
		.procname	= "dmesg_restrict",
		.data		= &dmesg_restrict,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= proc_dointvec_minmax,
		.extra1		= &zero,
		.extra2		= &one,
	},
721 722 723 724 725
	{
		.procname	= "kptr_restrict",
		.data		= &kptr_restrict,
		.maxlen		= sizeof(int),
		.mode		= 0644,
726
		.proc_handler	= proc_dmesg_restrict,
727 728 729
		.extra1		= &zero,
		.extra2		= &two,
	},
730
#endif
Linus Torvalds's avatar
Linus Torvalds committed
731 732 733 734 735
	{
		.procname	= "ngroups_max",
		.data		= &ngroups_max,
		.maxlen		= sizeof (int),
		.mode		= 0444,
736
		.proc_handler	= proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
737
	},
738 739 740 741 742 743 744
	{
		.procname	= "cap_last_cap",
		.data		= (void *)&cap_last_cap,
		.maxlen		= sizeof(int),
		.mode		= 0444,
		.proc_handler	= proc_dointvec,
	},
745
#if defined(CONFIG_LOCKUP_DETECTOR)
746
	{
747 748
		.procname       = "watchdog",
		.data           = &watchdog_enabled,
749 750
		.maxlen         = sizeof (int),
		.mode           = 0644,
751 752 753
		.proc_handler   = proc_dowatchdog,
		.extra1		= &zero,
		.extra2		= &one,
754 755 756
	},
	{
		.procname	= "watchdog_thresh",
757
		.data		= &watchdog_thresh,
758 759
		.maxlen		= sizeof(int),
		.mode		= 0644,
760
		.proc_handler	= proc_dowatchdog,
761 762
		.extra1		= &neg_one,
		.extra2		= &sixty,
763
	},
764 765 766 767 768 769 770 771 772
	{
		.procname	= "softlockup_panic",
		.data		= &softlockup_panic,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= proc_dointvec_minmax,
		.extra1		= &zero,
		.extra2		= &one,
	},
773 774 775 776 777
	{
		.procname       = "nmi_watchdog",
		.data           = &watchdog_enabled,
		.maxlen         = sizeof (int),
		.mode           = 0644,
778 779 780
		.proc_handler   = proc_dowatchdog,
		.extra1		= &zero,
		.extra2		= &one,
781 782 783 784 785 786 787 788 789 790
	},
#endif
#if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
	{
		.procname       = "unknown_nmi_panic",
		.data           = &unknown_nmi_panic,
		.maxlen         = sizeof (int),
		.mode           = 0644,
		.proc_handler   = proc_dointvec,
	},
791
#endif
Linus Torvalds's avatar
Linus Torvalds committed
792
#if defined(CONFIG_X86)
793 794 795 796 797
	{
		.procname	= "panic_on_unrecovered_nmi",
		.data		= &panic_on_unrecovered_nmi,
		.maxlen		= sizeof(int),
		.mode		= 0644,
798
		.proc_handler	= proc_dointvec,
799
	},
800 801 802 803 804
	{
		.procname	= "panic_on_io_nmi",
		.data		= &panic_on_io_nmi,
		.maxlen		= sizeof(int),
		.mode		= 0644,
805
		.proc_handler	= proc_dointvec,
806
	},
807 808 809 810 811 812 813 814 815
#ifdef CONFIG_DEBUG_STACKOVERFLOW
	{
		.procname	= "panic_on_stackoverflow",
		.data		= &sysctl_panic_on_stackoverflow,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= proc_dointvec,
	},
#endif
Linus Torvalds's avatar
Linus Torvalds committed
816 817 818 819 820
	{
		.procname	= "bootloader_type",
		.data		= &bootloader_type,
		.maxlen		= sizeof (int),
		.mode		= 0444,
821
		.proc_handler	= proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
822
	},
823 824 825 826 827
	{
		.procname	= "bootloader_version",
		.data		= &bootloader_version,
		.maxlen		= sizeof (int),
		.mode		= 0444,
828
		.proc_handler	= proc_dointvec,
829
	},
830 831 832 833 834
	{
		.procname	= "kstack_depth_to_print",
		.data		= &kstack_depth_to_print,
		.maxlen		= sizeof(int),
		.mode		= 0644,
835
		.proc_handler	= proc_dointvec,
836
	},
837 838 839 840 841
	{
		.procname	= "io_delay_type",
		.data		= &io_delay_type,
		.maxlen		= sizeof(int),
		.mode		= 0644,
842
		.proc_handler	= proc_dointvec,
843
	},
Linus Torvalds's avatar
Linus Torvalds committed
844
#endif
845
#if defined(CONFIG_MMU)
Linus Torvalds's avatar
Linus Torvalds committed
846 847 848 849 850
	{
		.procname	= "randomize_va_space",
		.data		= &randomize_va_space,
		.maxlen		= sizeof(int),
		.mode		= 0644,
851
		.proc_handler	= proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
852
	},
853
#endif
854
#if defined(CONFIG_S390) && defined(CONFIG_SMP)
855 856 857 858 859
	{
		.procname	= "spin_retry",
		.data		= &spin_retry,
		.maxlen		= sizeof (int),
		.mode		= 0644,
860
		.proc_handler	= proc_dointvec,
861
	},
862
#endif
Len Brown's avatar
Len Brown committed
863
#if	defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
864 865
	{
		.procname	= "acpi_video_flags",
866
		.data		= &acpi_realmode_flags,
867 868
		.maxlen		= sizeof (unsigned long),
		.mode		= 0644,
869
		.proc_handler	= proc_doulongvec_minmax,
870
	},
871 872 873 874 875 876 877
#endif
#ifdef CONFIG_IA64
	{
		.procname	= "ignore-unaligned-usertrap",
		.data		= &no_unaligned_warning,
		.maxlen		= sizeof (int),
	 	.mode		= 0644,
878
		.proc_handler	= proc_dointvec,
879
	},
880 881 882 883 884
	{
		.procname	= "unaligned-dump-stack",
		.data		= &unaligned_dump_stack,
		.maxlen		= sizeof (int),
		.mode		= 0644,
885
		.proc_handler	= proc_dointvec,
886
	},
887
#endif
888 889 890 891 892 893
#ifdef CONFIG_DETECT_HUNG_TASK
	{
		.procname	= "hung_task_panic",
		.data		= &sysctl_hung_task_panic,
		.maxlen		= sizeof(int),
		.mode		= 0644,
894
		.proc_handler	= proc_dointvec_minmax,
895 896 897
		.extra1		= &zero,
		.extra2		= &one,
	},
898 899 900
	{
		.procname	= "hung_task_check_count",
		.data		= &sysctl_hung_task_check_count,
Ingo Molnar's avatar
Ingo Molnar committed
901
		.maxlen		= sizeof(unsigned long),
902
		.mode		= 0644,
903
		.proc_handler	= proc_doulongvec_minmax,
904 905 906 907
	},
	{
		.procname	= "hung_task_timeout_secs",
		.data		= &sysctl_hung_task_timeout_secs,
Ingo Molnar's avatar
Ingo Molnar committed
908
		.maxlen		= sizeof(unsigned long),
909
		.mode		= 0644,
910
		.proc_handler	= proc_dohung_task_timeout_secs,
911 912 913 914
	},
	{
		.procname	= "hung_task_warnings",
		.data		= &sysctl_hung_task_warnings,
Ingo Molnar's avatar
Ingo Molnar committed
915
		.maxlen		= sizeof(unsigned long),
916
		.mode		= 0644,
917
		.proc_handler	= proc_doulongvec_minmax,
918
	},
919
#endif
920 921 922 923 924 925
#ifdef CONFIG_COMPAT
	{
		.procname	= "compat-log",
		.data		= &compat_log,
		.maxlen		= sizeof (int),
	 	.mode		= 0644,
926
		.proc_handler	= proc_dointvec,
927
	},
928
#endif
Ingo Molnar's avatar
Ingo Molnar committed
929 930 931 932 933 934
#ifdef CONFIG_RT_MUTEXES
	{
		.procname	= "max_lock_depth",
		.data		= &max_lock_depth,
		.maxlen		= sizeof(int),
		.mode		= 0644,
935
		.proc_handler	= proc_dointvec,
Ingo Molnar's avatar
Ingo Molnar committed
936
	},
Kees Cook's avatar
Kees Cook committed
937
#endif
938 939 940 941 942
	{
		.procname	= "poweroff_cmd",
		.data		= &poweroff_cmd,
		.maxlen		= POWEROFF_CMD_PATH_LEN,
		.mode		= 0644,
943
		.proc_handler	= proc_dostring,
944
	},
945 946 947 948 949 950 951
#ifdef CONFIG_KEYS
	{
		.procname	= "keys",
		.mode		= 0555,
		.child		= key_sysctls,
	},
#endif
952 953 954 955 956 957
#ifdef CONFIG_RCU_TORTURE_TEST
	{
		.procname       = "rcutorture_runnable",
		.data           = &rcutorture_runnable,
		.maxlen         = sizeof(int),
		.mode           = 0644,
958
		.proc_handler	= proc_dointvec,
959 960
	},
#endif
961
#ifdef CONFIG_PERF_EVENTS
962 963 964 965 966 967
	/*
	 * User-space scripts rely on the existence of this file
	 * as a feature check for perf_events being enabled.
	 *
	 * So it's an ABI, do not remove!
	 */
968
	{
969 970 971
		.procname	= "perf_event_paranoid",
		.data		= &sysctl_perf_event_paranoid,
		.maxlen		= sizeof(sysctl_perf_event_paranoid),
972
		.mode		= 0644,
973
		.proc_handler	= proc_dointvec,
974
	},
975
	{
976 977 978
		.procname	= "perf_event_mlock_kb",
		.data		= &sysctl_perf_event_mlock,
		.maxlen		= sizeof(sysctl_perf_event_mlock),
979
		.mode		= 0644,
980
		.proc_handler	= proc_dointvec,
981
	},
982
	{
983 984 985
		.procname	= "perf_event_max_sample_rate",
		.data		= &sysctl_perf_event_sample_rate,
		.maxlen		= sizeof(sysctl_perf_event_sample_rate),
986
		.mode		= 0644,
987
		.proc_handler	= perf_proc_update_handler,
988
	},
989
#endif
990 991 992 993 994 995
#ifdef CONFIG_KMEMCHECK
	{
		.procname