sysctl.c 68 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>
Linus Torvalds's avatar
Linus Torvalds committed
27
#include <linux/proc_fs.h>
28
#include <linux/security.h>
Linus Torvalds's avatar
Linus Torvalds committed
29
#include <linux/ctype.h>
30
#include <linux/kmemcheck.h>
31
#include <linux/fs.h>
Linus Torvalds's avatar
Linus Torvalds committed
32 33
#include <linux/init.h>
#include <linux/kernel.h>
34
#include <linux/kobject.h>
35
#include <linux/net.h>
Linus Torvalds's avatar
Linus Torvalds committed
36 37 38
#include <linux/sysrq.h>
#include <linux/highuid.h>
#include <linux/writeback.h>
39
#include <linux/ratelimit.h>
40
#include <linux/compaction.h>
Linus Torvalds's avatar
Linus Torvalds committed
41 42
#include <linux/hugetlb.h>
#include <linux/initrd.h>
43
#include <linux/key.h>
Linus Torvalds's avatar
Linus Torvalds committed
44 45 46
#include <linux/times.h>
#include <linux/limits.h>
#include <linux/dcache.h>
47
#include <linux/dnotify.h>
Linus Torvalds's avatar
Linus Torvalds committed
48
#include <linux/syscalls.h>
Adrian Bunk's avatar
Adrian Bunk committed
49
#include <linux/vmstat.h>
50 51
#include <linux/nfs_fs.h>
#include <linux/acpi.h>
52
#include <linux/reboot.h>
53
#include <linux/ftrace.h>
54
#include <linux/perf_event.h>
55
#include <linux/kprobes.h>
56
#include <linux/pipe_fs_i.h>
57
#include <linux/oom.h>
Linus Torvalds's avatar
Linus Torvalds committed
58 59 60 61

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

62 63
#ifdef CONFIG_X86
#include <asm/nmi.h>
64
#include <asm/stacktrace.h>
65
#include <asm/io.h>
66
#endif
Dave Young's avatar
Dave Young committed
67 68 69
#ifdef CONFIG_BSD_PROCESS_ACCT
#include <linux/acct.h>
#endif
Dave Young's avatar
Dave Young committed
70 71 72
#ifdef CONFIG_RT_MUTEXES
#include <linux/rtmutex.h>
#endif
Dave Young's avatar
Dave Young committed
73 74 75
#if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
#include <linux/lockdep.h>
#endif
Dave Young's avatar
Dave Young committed
76 77 78
#ifdef CONFIG_CHR_DEV_SG
#include <scsi/sg.h>
#endif
79

80
#ifdef CONFIG_LOCKUP_DETECTOR
81 82 83
#include <linux/nmi.h>
#endif

84

Linus Torvalds's avatar
Linus Torvalds committed
85 86 87 88 89 90 91
#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
92
extern int suid_dumpable;
Linus Torvalds's avatar
Linus Torvalds committed
93
extern char core_pattern[];
94
extern unsigned int core_pipe_limit;
Linus Torvalds's avatar
Linus Torvalds committed
95 96 97
extern int pid_max;
extern int min_free_kbytes;
extern int pid_max_min, pid_max_max;
Andrew Morton's avatar
Andrew Morton committed
98
extern int sysctl_drop_caches;
99
extern int percpu_pagelist_fraction;
100
extern int compat_log;
Arjan van de Ven's avatar
Arjan van de Ven committed
101
extern int latencytop_enabled;
102
extern int sysctl_nr_open_min, sysctl_nr_open_max;
103 104 105
#ifndef CONFIG_MMU
extern int sysctl_nr_trim_pages;
#endif
106
#ifdef CONFIG_BLOCK
107
extern int blk_iopoll_enabled;
108
#endif
Linus Torvalds's avatar
Linus Torvalds committed
109

110
/* Constants used for minimum and  maximum */
111
#ifdef CONFIG_LOCKUP_DETECTOR
112
static int sixty = 60;
113
static int neg_one = -1;
114 115 116
#endif

static int zero;
117 118
static int __maybe_unused one = 1;
static int __maybe_unused two = 2;
119
static unsigned long one_ul = 1;
120
static int one_hundred = 100;
121 122 123
#ifdef CONFIG_PRINTK
static int ten_thousand = 10000;
#endif
124

125 126 127
/* 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
128 129 130
/* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
static int maxolduid = 65535;
static int minolduid;
131
static int min_percpu_pagelist_fract = 8;
Linus Torvalds's avatar
Linus Torvalds committed
132 133 134

static int ngroups_max = NGROUPS_MAX;

Dave Young's avatar
Dave Young committed
135 136 137
#ifdef CONFIG_INOTIFY_USER
#include <linux/inotify.h>
#endif
138
#ifdef CONFIG_SPARC
139
#include <asm/system.h>
Linus Torvalds's avatar
Linus Torvalds committed
140 141
#endif

142 143 144 145
#ifdef CONFIG_SPARC64
extern int sysctl_tsb_ratio;
#endif

Linus Torvalds's avatar
Linus Torvalds committed
146 147 148 149 150
#ifdef __hppa__
extern int pwrsw_enabled;
extern int unaligned_enabled;
#endif

151
#ifdef CONFIG_S390
Linus Torvalds's avatar
Linus Torvalds committed
152 153 154 155
#ifdef CONFIG_MATHEMU
extern int sysctl_ieee_emulation_warnings;
#endif
extern int sysctl_userprocess_debug;
156
extern int spin_retry;
Linus Torvalds's avatar
Linus Torvalds committed
157 158
#endif

159 160
#ifdef CONFIG_IA64
extern int no_unaligned_warning;
161
extern int unaligned_dump_stack;
162 163
#endif

164
#ifdef CONFIG_PROC_SYSCTL
165
static int proc_do_cad_pid(struct ctl_table *table, int write,
166
		  void __user *buffer, size_t *lenp, loff_t *ppos);
167
static int proc_taint(struct ctl_table *table, int write,
168
			       void __user *buffer, size_t *lenp, loff_t *ppos);
169
#endif
170

171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191
#ifdef CONFIG_MAGIC_SYSRQ
static int __sysrq_enabled; /* Note: sysrq code ises it's own private copy */

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

192
static struct ctl_table root_table[];
193 194
static struct ctl_table_root sysctl_table_root;
static struct ctl_table_header root_table_header = {
195
	.count = 1,
196
	.ctl_table = root_table,
197
	.ctl_entry = LIST_HEAD_INIT(sysctl_table_root.default_set.list),
198
	.root = &sysctl_table_root,
199
	.set = &sysctl_table_root.default_set,
200 201 202
};
static struct ctl_table_root sysctl_table_root = {
	.root_list = LIST_HEAD_INIT(sysctl_table_root.root_list),
203
	.default_set.list = LIST_HEAD_INIT(root_table_header.ctl_entry),
204
};
Linus Torvalds's avatar
Linus Torvalds committed
205

206 207 208 209 210 211
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[];
212 213 214
#ifdef CONFIG_EPOLL
extern struct ctl_table epoll_table[];
#endif
Linus Torvalds's avatar
Linus Torvalds committed
215 216 217 218 219 220 221

#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
int sysctl_legacy_va_layout;
#endif

/* The default sysctl tables: */

222
static struct ctl_table root_table[] = {
Linus Torvalds's avatar
Linus Torvalds committed
223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247
	{
		.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,
	},
248 249 250 251
/*
 * NOTE: do not add new entries to this table unless you have read
 * Documentation/sysctl/ctl_unnumbered.txt
 */
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
	{
		.procname	= "timer_migration",
		.data		= &sysctl_timer_migration,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
340
		.proc_handler	= proc_dointvec_minmax,
341 342
		.extra1		= &zero,
		.extra2		= &one,
Peter Zijlstra's avatar
Peter Zijlstra committed
343
	},
344
#endif
Peter Zijlstra's avatar
Peter Zijlstra committed
345 346 347 348 349
	{
		.procname	= "sched_rt_period_us",
		.data		= &sysctl_sched_rt_period,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
350
		.proc_handler	= sched_rt_handler,
Peter Zijlstra's avatar
Peter Zijlstra committed
351 352 353 354 355 356
	},
	{
		.procname	= "sched_rt_runtime_us",
		.data		= &sysctl_sched_rt_runtime,
		.maxlen		= sizeof(int),
		.mode		= 0644,
357
		.proc_handler	= sched_rt_handler,
Peter Zijlstra's avatar
Peter Zijlstra committed
358
	},
359 360 361 362 363
	{
		.procname	= "sched_compat_yield",
		.data		= &sysctl_sched_compat_yield,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
364
		.proc_handler	= proc_dointvec,
365
	},
Peter Zijlstra's avatar
Peter Zijlstra committed
366 367 368 369 370 371
#ifdef CONFIG_PROVE_LOCKING
	{
		.procname	= "prove_locking",
		.data		= &prove_locking,
		.maxlen		= sizeof(int),
		.mode		= 0644,
372
		.proc_handler	= proc_dointvec,
Peter Zijlstra's avatar
Peter Zijlstra committed
373 374 375 376 377 378 379 380
	},
#endif
#ifdef CONFIG_LOCK_STAT
	{
		.procname	= "lock_stat",
		.data		= &lock_stat,
		.maxlen		= sizeof(int),
		.mode		= 0644,
381
		.proc_handler	= proc_dointvec,
Peter Zijlstra's avatar
Peter Zijlstra committed
382
	},
Ingo Molnar's avatar
Ingo Molnar committed
383
#endif
Linus Torvalds's avatar
Linus Torvalds committed
384 385 386 387 388
	{
		.procname	= "panic",
		.data		= &panic_timeout,
		.maxlen		= sizeof(int),
		.mode		= 0644,
389
		.proc_handler	= proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
390 391 392 393 394 395
	},
	{
		.procname	= "core_uses_pid",
		.data		= &core_uses_pid,
		.maxlen		= sizeof(int),
		.mode		= 0644,
396
		.proc_handler	= proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
397 398 399 400
	},
	{
		.procname	= "core_pattern",
		.data		= core_pattern,
401
		.maxlen		= CORENAME_MAX_SIZE,
Linus Torvalds's avatar
Linus Torvalds committed
402
		.mode		= 0644,
403
		.proc_handler	= proc_dostring,
Linus Torvalds's avatar
Linus Torvalds committed
404
	},
405 406 407 408 409
	{
		.procname	= "core_pipe_limit",
		.data		= &core_pipe_limit,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
410
		.proc_handler	= proc_dointvec,
411
	},
412
#ifdef CONFIG_PROC_SYSCTL
Linus Torvalds's avatar
Linus Torvalds committed
413 414
	{
		.procname	= "tainted",
Andi Kleen's avatar
Andi Kleen committed
415
		.maxlen 	= sizeof(long),
416
		.mode		= 0644,
417
		.proc_handler	= proc_taint,
Linus Torvalds's avatar
Linus Torvalds committed
418
	},
419
#endif
Arjan van de Ven's avatar
Arjan van de Ven committed
420 421 422 423 424 425
#ifdef CONFIG_LATENCYTOP
	{
		.procname	= "latencytop",
		.data		= &latencytop_enabled,
		.maxlen		= sizeof(int),
		.mode		= 0644,
426
		.proc_handler	= proc_dointvec,
Arjan van de Ven's avatar
Arjan van de Ven committed
427 428
	},
#endif
Linus Torvalds's avatar
Linus Torvalds committed
429 430 431 432 433 434
#ifdef CONFIG_BLK_DEV_INITRD
	{
		.procname	= "real-root-dev",
		.data		= &real_root_dev,
		.maxlen		= sizeof(int),
		.mode		= 0644,
435
		.proc_handler	= proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
436 437
	},
#endif
Ingo Molnar's avatar
Ingo Molnar committed
438 439 440 441 442
	{
		.procname	= "print-fatal-signals",
		.data		= &print_fatal_signals,
		.maxlen		= sizeof(int),
		.mode		= 0644,
443
		.proc_handler	= proc_dointvec,
Ingo Molnar's avatar
Ingo Molnar committed
444
	},
445
#ifdef CONFIG_SPARC
Linus Torvalds's avatar
Linus Torvalds committed
446 447 448 449 450
	{
		.procname	= "reboot-cmd",
		.data		= reboot_command,
		.maxlen		= 256,
		.mode		= 0644,
451
		.proc_handler	= proc_dostring,
Linus Torvalds's avatar
Linus Torvalds committed
452 453 454 455 456 457
	},
	{
		.procname	= "stop-a",
		.data		= &stop_a_enabled,
		.maxlen		= sizeof (int),
		.mode		= 0644,
458
		.proc_handler	= proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
459 460 461 462 463 464
	},
	{
		.procname	= "scons-poweroff",
		.data		= &scons_pwroff,
		.maxlen		= sizeof (int),
		.mode		= 0644,
465
		.proc_handler	= proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
466 467
	},
#endif
468 469 470 471 472 473
#ifdef CONFIG_SPARC64
	{
		.procname	= "tsb-ratio",
		.data		= &sysctl_tsb_ratio,
		.maxlen		= sizeof (int),
		.mode		= 0644,
474
		.proc_handler	= proc_dointvec,
475 476
	},
#endif
Linus Torvalds's avatar
Linus Torvalds committed
477 478 479 480 481 482
#ifdef __hppa__
	{
		.procname	= "soft-power",
		.data		= &pwrsw_enabled,
		.maxlen		= sizeof (int),
	 	.mode		= 0644,
483
		.proc_handler	= proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
484 485 486 487 488 489
	},
	{
		.procname	= "unaligned-trap",
		.data		= &unaligned_enabled,
		.maxlen		= sizeof (int),
		.mode		= 0644,
490
		.proc_handler	= proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
491 492 493 494 495 496 497
	},
#endif
	{
		.procname	= "ctrl-alt-del",
		.data		= &C_A_D,
		.maxlen		= sizeof(int),
		.mode		= 0644,
498
		.proc_handler	= proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
499
	},
500
#ifdef CONFIG_FUNCTION_TRACER
501 502 503 504 505
	{
		.procname	= "ftrace_enabled",
		.data		= &ftrace_enabled,
		.maxlen		= sizeof(int),
		.mode		= 0644,
506
		.proc_handler	= ftrace_enable_sysctl,
507 508
	},
#endif
509 510 511 512 513 514
#ifdef CONFIG_STACK_TRACER
	{
		.procname	= "stack_tracer_enabled",
		.data		= &stack_tracer_enabled,
		.maxlen		= sizeof(int),
		.mode		= 0644,
515
		.proc_handler	= stack_trace_sysctl,
516 517
	},
#endif
518 519
#ifdef CONFIG_TRACING
	{
Peter Zijlstra's avatar
Peter Zijlstra committed
520
		.procname	= "ftrace_dump_on_oops",
521 522 523
		.data		= &ftrace_dump_on_oops,
		.maxlen		= sizeof(int),
		.mode		= 0644,
524
		.proc_handler	= proc_dointvec,
525 526
	},
#endif
527
#ifdef CONFIG_MODULES
Linus Torvalds's avatar
Linus Torvalds committed
528 529 530 531 532
	{
		.procname	= "modprobe",
		.data		= &modprobe_path,
		.maxlen		= KMOD_PATH_LEN,
		.mode		= 0644,
533
		.proc_handler	= proc_dostring,
Linus Torvalds's avatar
Linus Torvalds committed
534
	},
535 536 537 538 539 540
	{
		.procname	= "modules_disabled",
		.data		= &modules_disabled,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		/* only handle a transition from default "0" to "1" */
541
		.proc_handler	= proc_dointvec_minmax,
542 543 544
		.extra1		= &one,
		.extra2		= &one,
	},
Linus Torvalds's avatar
Linus Torvalds committed
545
#endif
546
#ifdef CONFIG_HOTPLUG
Linus Torvalds's avatar
Linus Torvalds committed
547 548
	{
		.procname	= "hotplug",
549 550
		.data		= &uevent_helper,
		.maxlen		= UEVENT_HELPER_PATH_LEN,
Linus Torvalds's avatar
Linus Torvalds committed
551
		.mode		= 0644,
552
		.proc_handler	= proc_dostring,
Linus Torvalds's avatar
Linus Torvalds committed
553 554 555 556 557 558 559 560
	},
#endif
#ifdef CONFIG_CHR_DEV_SG
	{
		.procname	= "sg-big-buff",
		.data		= &sg_big_buff,
		.maxlen		= sizeof (int),
		.mode		= 0444,
561
		.proc_handler	= proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
562 563 564 565 566 567 568 569
	},
#endif
#ifdef CONFIG_BSD_PROCESS_ACCT
	{
		.procname	= "acct",
		.data		= &acct_parm,
		.maxlen		= 3*sizeof(int),
		.mode		= 0644,
570
		.proc_handler	= proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
571 572 573 574 575
	},
#endif
#ifdef CONFIG_MAGIC_SYSRQ
	{
		.procname	= "sysrq",
576
		.data		= &__sysrq_enabled,
Linus Torvalds's avatar
Linus Torvalds committed
577 578
		.maxlen		= sizeof (int),
		.mode		= 0644,
579
		.proc_handler	= sysrq_sysctl_handler,
Linus Torvalds's avatar
Linus Torvalds committed
580 581
	},
#endif
582
#ifdef CONFIG_PROC_SYSCTL
Linus Torvalds's avatar
Linus Torvalds committed
583 584
	{
		.procname	= "cad_pid",
585
		.data		= NULL,
Linus Torvalds's avatar
Linus Torvalds committed
586 587
		.maxlen		= sizeof (int),
		.mode		= 0600,
588
		.proc_handler	= proc_do_cad_pid,
Linus Torvalds's avatar
Linus Torvalds committed
589
	},
590
#endif
Linus Torvalds's avatar
Linus Torvalds committed
591 592 593 594 595
	{
		.procname	= "threads-max",
		.data		= &max_threads,
		.maxlen		= sizeof(int),
		.mode		= 0644,
596
		.proc_handler	= proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
597 598 599 600 601 602 603 604 605 606 607
	},
	{
		.procname	= "random",
		.mode		= 0555,
		.child		= random_table,
	},
	{
		.procname	= "overflowuid",
		.data		= &overflowuid,
		.maxlen		= sizeof(int),
		.mode		= 0644,
608
		.proc_handler	= proc_dointvec_minmax,
Linus Torvalds's avatar
Linus Torvalds committed
609 610 611 612 613 614 615 616
		.extra1		= &minolduid,
		.extra2		= &maxolduid,
	},
	{
		.procname	= "overflowgid",
		.data		= &overflowgid,
		.maxlen		= sizeof(int),
		.mode		= 0644,
617
		.proc_handler	= proc_dointvec_minmax,
Linus Torvalds's avatar
Linus Torvalds committed
618 619 620
		.extra1		= &minolduid,
		.extra2		= &maxolduid,
	},
621
#ifdef CONFIG_S390
Linus Torvalds's avatar
Linus Torvalds committed
622 623 624 625 626 627
#ifdef CONFIG_MATHEMU
	{
		.procname	= "ieee_emulation_warnings",
		.data		= &sysctl_ieee_emulation_warnings,
		.maxlen		= sizeof(int),
		.mode		= 0644,
628
		.proc_handler	= proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
629 630 631 632
	},
#endif
	{
		.procname	= "userprocess_debug",
633
		.data		= &show_unhandled_signals,
Linus Torvalds's avatar
Linus Torvalds committed
634 635
		.maxlen		= sizeof(int),
		.mode		= 0644,
636
		.proc_handler	= proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
637 638 639 640 641 642 643
	},
#endif
	{
		.procname	= "pid_max",
		.data		= &pid_max,
		.maxlen		= sizeof (int),
		.mode		= 0644,
644
		.proc_handler	= proc_dointvec_minmax,
Linus Torvalds's avatar
Linus Torvalds committed
645 646 647 648 649 650 651 652
		.extra1		= &pid_max_min,
		.extra2		= &pid_max_max,
	},
	{
		.procname	= "panic_on_oops",
		.data		= &panic_on_oops,
		.maxlen		= sizeof(int),
		.mode		= 0644,
653
		.proc_handler	= proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
654
	},
655 656 657 658 659 660
#if defined CONFIG_PRINTK
	{
		.procname	= "printk",
		.data		= &console_loglevel,
		.maxlen		= 4*sizeof(int),
		.mode		= 0644,
661
		.proc_handler	= proc_dointvec,
662
	},
Linus Torvalds's avatar
Linus Torvalds committed
663 664
	{
		.procname	= "printk_ratelimit",
Dave Young's avatar
Dave Young committed
665
		.data		= &printk_ratelimit_state.interval,
Linus Torvalds's avatar
Linus Torvalds committed
666 667
		.maxlen		= sizeof(int),
		.mode		= 0644,
668
		.proc_handler	= proc_dointvec_jiffies,
Linus Torvalds's avatar
Linus Torvalds committed
669 670 671
	},
	{
		.procname	= "printk_ratelimit_burst",
Dave Young's avatar
Dave Young committed
672
		.data		= &printk_ratelimit_state.burst,
Linus Torvalds's avatar
Linus Torvalds committed
673 674
		.maxlen		= sizeof(int),
		.mode		= 0644,
675
		.proc_handler	= proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
676
	},
677 678 679 680 681
	{
		.procname	= "printk_delay",
		.data		= &printk_delay_msec,
		.maxlen		= sizeof(int),
		.mode		= 0644,
682
		.proc_handler	= proc_dointvec_minmax,
683 684 685
		.extra1		= &zero,
		.extra2		= &ten_thousand,
	},
686
#endif
687 688 689 690 691 692 693 694 695
	{
		.procname	= "dmesg_restrict",
		.data		= &dmesg_restrict,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= proc_dointvec_minmax,
		.extra1		= &zero,
		.extra2		= &one,
	},
Linus Torvalds's avatar
Linus Torvalds committed
696 697 698 699 700
	{
		.procname	= "ngroups_max",
		.data		= &ngroups_max,
		.maxlen		= sizeof (int),
		.mode		= 0444,
701
		.proc_handler	= proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
702
	},
703
#if defined(CONFIG_LOCKUP_DETECTOR)
704
	{
705 706
		.procname       = "watchdog",
		.data           = &watchdog_enabled,
707 708
		.maxlen         = sizeof (int),
		.mode           = 0644,
709 710 711 712 713 714 715 716 717 718
		.proc_handler   = proc_dowatchdog_enabled,
	},
	{
		.procname	= "watchdog_thresh",
		.data		= &softlockup_thresh,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= proc_dowatchdog_thresh,
		.extra1		= &neg_one,
		.extra2		= &sixty,
719
	},
720 721 722 723 724 725 726 727 728
	{
		.procname	= "softlockup_panic",
		.data		= &softlockup_panic,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= proc_dointvec_minmax,
		.extra1		= &zero,
		.extra2		= &one,
	},
729
#endif
730
#if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86) && !defined(CONFIG_LOCKUP_DETECTOR)
Linus Torvalds's avatar
Linus Torvalds committed
731 732 733 734 735
	{
		.procname       = "unknown_nmi_panic",
		.data           = &unknown_nmi_panic,
		.maxlen         = sizeof (int),
		.mode           = 0644,
736
		.proc_handler   = proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
737
	},
738 739 740 741 742
	{
		.procname       = "nmi_watchdog",
		.data           = &nmi_watchdog_enabled,
		.maxlen         = sizeof (int),
		.mode           = 0644,
743
		.proc_handler   = proc_nmi_enabled,
Linus Torvalds's avatar
Linus Torvalds committed
744 745 746
	},
#endif
#if defined(CONFIG_X86)
747 748 749 750 751
	{
		.procname	= "panic_on_unrecovered_nmi",
		.data		= &panic_on_unrecovered_nmi,
		.maxlen		= sizeof(int),
		.mode		= 0644,
752
		.proc_handler	= proc_dointvec,
753
	},
754 755 756 757 758
	{
		.procname	= "panic_on_io_nmi",
		.data		= &panic_on_io_nmi,
		.maxlen		= sizeof(int),
		.mode		= 0644,
759
		.proc_handler	= proc_dointvec,
760
	},
Linus Torvalds's avatar
Linus Torvalds committed
761 762 763 764 765
	{
		.procname	= "bootloader_type",
		.data		= &bootloader_type,
		.maxlen		= sizeof (int),
		.mode		= 0444,
766
		.proc_handler	= proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
767
	},
768 769 770 771 772
	{
		.procname	= "bootloader_version",
		.data		= &bootloader_version,
		.maxlen		= sizeof (int),
		.mode		= 0444,
773
		.proc_handler	= proc_dointvec,
774
	},
775 776 777 778 779
	{
		.procname	= "kstack_depth_to_print",
		.data		= &kstack_depth_to_print,
		.maxlen		= sizeof(int),
		.mode		= 0644,
780
		.proc_handler	= proc_dointvec,
781
	},
782 783 784 785 786
	{
		.procname	= "io_delay_type",
		.data		= &io_delay_type,
		.maxlen		= sizeof(int),
		.mode		= 0644,
787
		.proc_handler	= proc_dointvec,
788
	},
Linus Torvalds's avatar
Linus Torvalds committed
789
#endif
790
#if defined(CONFIG_MMU)
Linus Torvalds's avatar
Linus Torvalds committed
791 792 793 794 795
	{
		.procname	= "randomize_va_space",
		.data		= &randomize_va_space,
		.maxlen		= sizeof(int),
		.mode		= 0644,
796
		.proc_handler	= proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
797
	},
798
#endif
799
#if defined(CONFIG_S390) && defined(CONFIG_SMP)
800 801 802 803 804
	{
		.procname	= "spin_retry",
		.data		= &spin_retry,
		.maxlen		= sizeof (int),
		.mode		= 0644,
805
		.proc_handler	= proc_dointvec,
806
	},
807
#endif
Len Brown's avatar
Len Brown committed
808
#if	defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
809 810
	{
		.procname	= "acpi_video_flags",
811
		.data		= &acpi_realmode_flags,
812 813
		.maxlen		= sizeof (unsigned long),
		.mode		= 0644,
814
		.proc_handler	= proc_doulongvec_minmax,
815
	},
816 817 818 819 820 821 822
#endif
#ifdef CONFIG_IA64
	{
		.procname	= "ignore-unaligned-usertrap",
		.data		= &no_unaligned_warning,
		.maxlen		= sizeof (int),
	 	.mode		= 0644,
823
		.proc_handler	= proc_dointvec,
824
	},
825 826 827 828 829
	{
		.procname	= "unaligned-dump-stack",
		.data		= &unaligned_dump_stack,
		.maxlen		= sizeof (int),
		.mode		= 0644,
830
		.proc_handler	= proc_dointvec,
831
	},
832
#endif
833 834 835 836 837 838
#ifdef CONFIG_DETECT_HUNG_TASK
	{
		.procname	= "hung_task_panic",
		.data		= &sysctl_hung_task_panic,
		.maxlen		= sizeof(int),
		.mode		= 0644,
839
		.proc_handler	= proc_dointvec_minmax,
840 841 842
		.extra1		= &zero,
		.extra2		= &one,
	},
843 844 845
	{
		.procname	= "hung_task_check_count",
		.data		= &sysctl_hung_task_check_count,
Ingo Molnar's avatar
Ingo Molnar committed
846
		.maxlen		= sizeof(unsigned long),
847
		.mode		= 0644,
848
		.proc_handler	= proc_doulongvec_minmax,
849 850 851 852
	},
	{
		.procname	= "hung_task_timeout_secs",
		.data		= &sysctl_hung_task_timeout_secs,
Ingo Molnar's avatar
Ingo Molnar committed
853
		.maxlen		= sizeof(unsigned long),
854
		.mode		= 0644,
855
		.proc_handler	= proc_dohung_task_timeout_secs,
856 857 858 859
	},
	{
		.procname	= "hung_task_warnings",
		.data		= &sysctl_hung_task_warnings,
Ingo Molnar's avatar
Ingo Molnar committed
860
		.maxlen		= sizeof(unsigned long),
861
		.mode		= 0644,
862
		.proc_handler	= proc_doulongvec_minmax,
863
	},
864
#endif
865 866 867 868 869 870
#ifdef CONFIG_COMPAT
	{
		.procname	= "compat-log",
		.data		= &compat_log,
		.maxlen		= sizeof (int),
	 	.mode		= 0644,
871
		.proc_handler	= proc_dointvec,
872
	},
873
#endif
Ingo Molnar's avatar
Ingo Molnar committed
874 875 876 877 878 879
#ifdef CONFIG_RT_MUTEXES
	{
		.procname	= "max_lock_depth",
		.data		= &max_lock_depth,
		.maxlen		= sizeof(int),
		.mode		= 0644,
880
		.proc_handler	= proc_dointvec,
Ingo Molnar's avatar
Ingo Molnar committed
881
	},
Kees Cook's avatar
Kees Cook committed
882
#endif
883 884 885 886 887
	{
		.procname	= "poweroff_cmd",
		.data		= &poweroff_cmd,
		.maxlen		= POWEROFF_CMD_PATH_LEN,
		.mode		= 0644,
888
		.proc_handler	= proc_dostring,
889
	},
890 891 892 893 894 895 896
#ifdef CONFIG_KEYS
	{
		.procname	= "keys",
		.mode		= 0555,
		.child		= key_sysctls,
	},
#endif
897 898 899 900 901 902
#ifdef CONFIG_RCU_TORTURE_TEST
	{
		.procname       = "rcutorture_runnable",
		.data           = &rcutorture_runnable,
		.maxlen         = sizeof(int),
		.mode           = 0644,
903
		.proc_handler	= proc_dointvec,
904 905
	},
#endif
906
#ifdef CONFIG_PERF_EVENTS
907
	{
908 909 910
		.procname	= "perf_event_paranoid",
		.data		= &sysctl_perf_event_paranoid,
		.maxlen		= sizeof(sysctl_perf_event_paranoid),
911
		.mode		= 0644,
912
		.proc_handler	= proc_dointvec,
913
	},
914
	{
915 916 917
		.procname	= "perf_event_mlock_kb",
		.data		= &sysctl_perf_event_mlock,
		.maxlen		= sizeof(sysctl_perf_event_mlock),
918
		.mode		= 0644,
919
		.proc_handler	= proc_dointvec,
920
	},
921
	{
922 923 924
		.procname	= "perf_event_max_sample_rate",
		.data		= &sysctl_perf_event_sample_rate,
		.maxlen		= sizeof(sysctl_perf_event_sample_rate),
925
		.mode		= 0644,
926
		.proc_handler	= proc_dointvec,
927
	},
928
#endif
929 930 931 932 933 934
#ifdef CONFIG_KMEMCHECK
	{
		.procname	= "kmemcheck",
		.data		= &kmemcheck_enabled,
		.maxlen		= sizeof(int),
		.mode		= 0644,
935
		.proc_handler	= proc_dointvec,
936 937
	},
#endif
938
#ifdef CONFIG_BLOCK
939 940 941 942 943
	{
		.procname	= "blk_iopoll",
		.data		= &blk_iopoll_enabled,
		.maxlen		= sizeof(int),
		.mode		= 0644,
944
		.proc_handler	= proc_dointvec,
945
	},
946
#endif
947 948 949 950
/*
 * NOTE: do not add new entries to this table unless you have read
 * Documentation/sysctl/ctl_unnumbered.txt
 */
951
	{ }
Linus Torvalds's avatar
Linus Torvalds committed
952 953
};

954
static struct ctl_table vm_table[] = {
Linus Torvalds's avatar
Linus Torvalds committed
955 956 957 958 959
	{
		.procname	= "overcommit_memory",
		.data		= &sysctl_overcommit_memory,
		.maxlen		= sizeof(sysctl_overcommit_memory),
		.mode		= 0644,
960
		.proc_handler	= proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
961
	},
962 963 964 965 966
	{
		.procname	= "panic_on_oom",
		.data		= &sysctl_panic_on_oom,
		.maxlen		= sizeof(sysctl_panic_on_oom),
		.mode		= 0644,
967
		.proc_handler	= proc_dointvec,
968
	},
969 970 971 972 973
	{
		.procname	= "oom_kill_allocating_task",
		.data		= &sysctl_oom_kill_allocating_task,
		.maxlen		= sizeof(sysctl_oom_kill_allocating_task),
		.mode		= 0644,
974
		.proc_handler	= proc_dointvec,
975
	},
976 977 978 979 980
	{
		.procname	= "oom_dump_tasks",
		.data		= &sysctl_oom_dump_tasks,
		.maxlen		= sizeof(sysctl_oom_dump_tasks),
		.mode		= 0644,
981
		.proc_handler	= proc_dointvec,