sysctl.c 68.7 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>
Linus Torvalds's avatar
Linus Torvalds committed
59 60 61 62

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

63 64
#ifdef CONFIG_X86
#include <asm/nmi.h>
65
#include <asm/stacktrace.h>
66
#include <asm/io.h>
67
#endif
Dave Young's avatar
Dave Young committed
68 69 70
#ifdef CONFIG_BSD_PROCESS_ACCT
#include <linux/acct.h>
#endif
Dave Young's avatar
Dave Young committed
71 72 73
#ifdef CONFIG_RT_MUTEXES
#include <linux/rtmutex.h>
#endif
Dave Young's avatar
Dave Young committed
74 75 76
#if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
#include <linux/lockdep.h>
#endif
Dave Young's avatar
Dave Young committed
77 78 79
#ifdef CONFIG_CHR_DEV_SG
#include <scsi/sg.h>
#endif
80

81
#ifdef CONFIG_LOCKUP_DETECTOR
82 83 84
#include <linux/nmi.h>
#endif

85

Linus Torvalds's avatar
Linus Torvalds committed
86 87 88 89 90 91 92
#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
93
extern int suid_dumpable;
Linus Torvalds's avatar
Linus Torvalds committed
94
extern char core_pattern[];
95
extern unsigned int core_pipe_limit;
Linus Torvalds's avatar
Linus Torvalds committed
96 97 98
extern int pid_max;
extern int min_free_kbytes;
extern int pid_max_min, pid_max_max;
Andrew Morton's avatar
Andrew Morton committed
99
extern int sysctl_drop_caches;
100
extern int percpu_pagelist_fraction;
101
extern int compat_log;
Arjan van de Ven's avatar
Arjan van de Ven committed
102
extern int latencytop_enabled;
103
extern int sysctl_nr_open_min, sysctl_nr_open_max;
104 105 106
#ifndef CONFIG_MMU
extern int sysctl_nr_trim_pages;
#endif
107
#ifdef CONFIG_BLOCK
108
extern int blk_iopoll_enabled;
109
#endif
Linus Torvalds's avatar
Linus Torvalds committed
110

111
/* Constants used for minimum and  maximum */
112
#ifdef CONFIG_LOCKUP_DETECTOR
113
static int sixty = 60;
114
static int neg_one = -1;
115 116 117
#endif

static int zero;
118 119
static int __maybe_unused one = 1;
static int __maybe_unused two = 2;
120
static int __maybe_unused three = 3;
121
static unsigned long one_ul = 1;
122
static int one_hundred = 100;
123 124 125
#ifdef CONFIG_PRINTK
static int ten_thousand = 10000;
#endif
126

127 128 129
/* 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
130 131 132
/* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
static int maxolduid = 65535;
static int minolduid;
133
static int min_percpu_pagelist_fract = 8;
Linus Torvalds's avatar
Linus Torvalds committed
134 135 136

static int ngroups_max = NGROUPS_MAX;

Dave Young's avatar
Dave Young committed
137 138 139
#ifdef CONFIG_INOTIFY_USER
#include <linux/inotify.h>
#endif
140
#ifdef CONFIG_SPARC
141
#include <asm/system.h>
Linus Torvalds's avatar
Linus Torvalds committed
142 143
#endif

144 145 146 147
#ifdef CONFIG_SPARC64
extern int sysctl_tsb_ratio;
#endif

Linus Torvalds's avatar
Linus Torvalds committed
148 149 150 151 152
#ifdef __hppa__
extern int pwrsw_enabled;
extern int unaligned_enabled;
#endif

153
#ifdef CONFIG_S390
Linus Torvalds's avatar
Linus Torvalds committed
154 155 156 157
#ifdef CONFIG_MATHEMU
extern int sysctl_ieee_emulation_warnings;
#endif
extern int sysctl_userprocess_debug;
158
extern int spin_retry;
Linus Torvalds's avatar
Linus Torvalds committed
159 160
#endif

161 162
#ifdef CONFIG_IA64
extern int no_unaligned_warning;
163
extern int unaligned_dump_stack;
164 165
#endif

166
#ifdef CONFIG_PROC_SYSCTL
167
static int proc_do_cad_pid(struct ctl_table *table, int write,
168
		  void __user *buffer, size_t *lenp, loff_t *ppos);
169
static int proc_taint(struct ctl_table *table, int write,
170
			       void __user *buffer, size_t *lenp, loff_t *ppos);
171
#endif
172

173 174 175 176 177
#ifdef CONFIG_PRINTK
static int proc_dmesg_restrict(struct ctl_table *table, int write,
				void __user *buffer, size_t *lenp, loff_t *ppos);
#endif

178
#ifdef CONFIG_MAGIC_SYSRQ
179 180
/* Note: sysrq code uses it's own private copy */
static int __sysrq_enabled = SYSRQ_DEFAULT_ENABLE;
181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199

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

200
static struct ctl_table root_table[];
201 202
static struct ctl_table_root sysctl_table_root;
static struct ctl_table_header root_table_header = {
Al Viro's avatar
Al Viro committed
203
	{{.count = 1,
204
	.ctl_table = root_table,
Al Viro's avatar
Al Viro committed
205
	.ctl_entry = LIST_HEAD_INIT(sysctl_table_root.default_set.list),}},
206
	.root = &sysctl_table_root,
207
	.set = &sysctl_table_root.default_set,
208 209 210
};
static struct ctl_table_root sysctl_table_root = {
	.root_list = LIST_HEAD_INIT(sysctl_table_root.root_list),
211
	.default_set.list = LIST_HEAD_INIT(root_table_header.ctl_entry),
212
};
Linus Torvalds's avatar
Linus Torvalds committed
213

214 215 216 217 218 219
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[];
220 221 222
#ifdef CONFIG_EPOLL
extern struct ctl_table epoll_table[];
#endif
Linus Torvalds's avatar
Linus Torvalds committed
223 224 225 226 227 228 229

#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
int sysctl_legacy_va_layout;
#endif

/* The default sysctl tables: */

230
static struct ctl_table root_table[] = {
Linus Torvalds's avatar
Linus Torvalds committed
231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255
	{
		.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,
	},
256
	{ }
Linus Torvalds's avatar
Linus Torvalds committed
257 258
};

Ingo Molnar's avatar
Ingo Molnar committed
259
#ifdef CONFIG_SCHED_DEBUG
260 261 262 263
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 */
264 265
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
266 267
#endif

268 269 270 271 272
#ifdef CONFIG_COMPACTION
static int min_extfrag_threshold;
static int max_extfrag_threshold = 1000;
#endif

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

974
static struct ctl_table vm_table[] = {
Linus Torvalds's avatar
Linus Torvalds committed
975 976 977 978 979
	{
		.procname	= "overcommit_memory",
		.data		= &sysctl_overcommit_memory,
		.maxlen		= sizeof(sysctl_overcommit_memory),
		.mode		= 0644,
980 981 982
		.proc_handler	= proc_dointvec_minmax,
		.extra1		= &zero,
		.extra2		= &two,
Linus Torvalds's avatar
Linus Torvalds committed
983
	},
984 985 986 987 988
	{
		.procname	= "panic_on_oom",
		.data		= &sysctl_panic_on_oom,
		.maxlen		= sizeof(sysctl_panic_on_oom),
		.mode		= 0644,
989 990 991
		.proc_handler	= proc_dointvec_minmax,
		.extra1		= &zero,
		.extra2		= &two,