sysctl.c 68.1 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 unsigned long one_ul = 1;
121
static int one_hundred = 100;
122 123 124
#ifdef CONFIG_PRINTK
static int ten_thousand = 10000;
#endif
125

126 127 128
/* 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
129 130 131
/* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
static int maxolduid = 65535;
static int minolduid;
132
static int min_percpu_pagelist_fract = 8;
Linus Torvalds's avatar
Linus Torvalds committed
133 134 135

static int ngroups_max = NGROUPS_MAX;

Dave Young's avatar
Dave Young committed
136 137 138
#ifdef CONFIG_INOTIFY_USER
#include <linux/inotify.h>
#endif
139
#ifdef CONFIG_SPARC
140
#include <asm/system.h>
Linus Torvalds's avatar
Linus Torvalds committed
141 142
#endif

143 144 145 146
#ifdef CONFIG_SPARC64
extern int sysctl_tsb_ratio;
#endif

Linus Torvalds's avatar
Linus Torvalds committed
147 148 149 150 151
#ifdef __hppa__
extern int pwrsw_enabled;
extern int unaligned_enabled;
#endif

152
#ifdef CONFIG_S390
Linus Torvalds's avatar
Linus Torvalds committed
153 154 155 156
#ifdef CONFIG_MATHEMU
extern int sysctl_ieee_emulation_warnings;
#endif
extern int sysctl_userprocess_debug;
157
extern int spin_retry;
Linus Torvalds's avatar
Linus Torvalds committed
158 159
#endif

160 161
#ifdef CONFIG_IA64
extern int no_unaligned_warning;
162
extern int unaligned_dump_stack;
163 164
#endif

165
#ifdef CONFIG_PROC_SYSCTL
166
static int proc_do_cad_pid(struct ctl_table *table, int write,
167
		  void __user *buffer, size_t *lenp, loff_t *ppos);
168
static int proc_taint(struct ctl_table *table, int write,
169
			       void __user *buffer, size_t *lenp, loff_t *ppos);
170
#endif
171

172
#ifdef CONFIG_MAGIC_SYSRQ
173 174
/* Note: sysrq code uses it's own private copy */
static int __sysrq_enabled = SYSRQ_DEFAULT_ENABLE;
175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193

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

194
static struct ctl_table root_table[];
195 196
static struct ctl_table_root sysctl_table_root;
static struct ctl_table_header root_table_header = {
197
	.count = 1,
198
	.ctl_table = root_table,
199
	.ctl_entry = LIST_HEAD_INIT(sysctl_table_root.default_set.list),
200
	.root = &sysctl_table_root,
201
	.set = &sysctl_table_root.default_set,
202 203 204
};
static struct ctl_table_root sysctl_table_root = {
	.root_list = LIST_HEAD_INIT(sysctl_table_root.root_list),
205
	.default_set.list = LIST_HEAD_INIT(root_table_header.ctl_entry),
206
};
Linus Torvalds's avatar
Linus Torvalds committed
207

208 209 210 211 212 213
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[];
214 215 216
#ifdef CONFIG_EPOLL
extern struct ctl_table epoll_table[];
#endif
Linus Torvalds's avatar
Linus Torvalds committed
217 218 219 220 221 222 223

#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
int sysctl_legacy_va_layout;
#endif

/* The default sysctl tables: */

224
static struct ctl_table root_table[] = {
Linus Torvalds's avatar
Linus Torvalds committed
225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249
	{
		.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,
	},
250
	{ }
Linus Torvalds's avatar
Linus Torvalds committed
251 252
};

Ingo Molnar's avatar
Ingo Molnar committed
253
#ifdef CONFIG_SCHED_DEBUG
254 255 256 257
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 */
258 259
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
260 261
#endif

262 263 264 265 266
#ifdef CONFIG_COMPACTION
static int min_extfrag_threshold;
static int max_extfrag_threshold = 1000;
#endif

267
static struct ctl_table kern_table[] = {
268 269 270 271 272
	{
		.procname	= "sched_child_runs_first",
		.data		= &sysctl_sched_child_runs_first,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
273
		.proc_handler	= proc_dointvec,
274
	},
Ingo Molnar's avatar
Ingo Molnar committed
275 276
#ifdef CONFIG_SCHED_DEBUG
	{
277 278
		.procname	= "sched_min_granularity_ns",
		.data		= &sysctl_sched_min_granularity,
Ingo Molnar's avatar
Ingo Molnar committed
279 280
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
281
		.proc_handler	= sched_proc_update_handler,
282 283
		.extra1		= &min_sched_granularity_ns,
		.extra2		= &max_sched_granularity_ns,
Ingo Molnar's avatar
Ingo Molnar committed
284
	},
285 286 287 288 289
	{
		.procname	= "sched_latency_ns",
		.data		= &sysctl_sched_latency,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
290
		.proc_handler	= sched_proc_update_handler,
291 292 293
		.extra1		= &min_sched_granularity_ns,
		.extra2		= &max_sched_granularity_ns,
	},
Ingo Molnar's avatar
Ingo Molnar committed
294 295 296 297 298
	{
		.procname	= "sched_wakeup_granularity_ns",
		.data		= &sysctl_sched_wakeup_granularity,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
299
		.proc_handler	= sched_proc_update_handler,
Ingo Molnar's avatar
Ingo Molnar committed
300 301 302
		.extra1		= &min_wakeup_granularity_ns,
		.extra2		= &max_wakeup_granularity_ns,
	},
303 304 305 306 307
	{
		.procname	= "sched_tunable_scaling",
		.data		= &sysctl_sched_tunable_scaling,
		.maxlen		= sizeof(enum sched_tunable_scaling),
		.mode		= 0644,
308
		.proc_handler	= sched_proc_update_handler,
309 310
		.extra1		= &min_sched_tunable_scaling,
		.extra2		= &max_sched_tunable_scaling,
311
	},
312 313 314 315 316
	{
		.procname	= "sched_migration_cost",
		.data		= &sysctl_sched_migration_cost,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
317
		.proc_handler	= proc_dointvec,
318
	},
319 320 321 322
	{
		.procname	= "sched_nr_migrate",
		.data		= &sysctl_sched_nr_migrate,
		.maxlen		= sizeof(unsigned int),
Peter Zijlstra's avatar
Peter Zijlstra committed
323
		.mode		= 0644,
324
		.proc_handler	= proc_dointvec,
Peter Zijlstra's avatar
Peter Zijlstra committed
325
	},
326 327 328 329 330
	{
		.procname	= "sched_time_avg",
		.data		= &sysctl_sched_time_avg,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
331
		.proc_handler	= proc_dointvec,
332
	},
333 334 335 336 337 338 339
	{
		.procname	= "sched_shares_window",
		.data		= &sysctl_sched_shares_window,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
		.proc_handler	= proc_dointvec,
	},
340 341 342 343 344
	{
		.procname	= "timer_migration",
		.data		= &sysctl_timer_migration,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
345
		.proc_handler	= proc_dointvec_minmax,
346 347
		.extra1		= &zero,
		.extra2		= &one,
Peter Zijlstra's avatar
Peter Zijlstra committed
348
	},
349
#endif
Peter Zijlstra's avatar
Peter Zijlstra committed
350 351 352 353 354
	{
		.procname	= "sched_rt_period_us",
		.data		= &sysctl_sched_rt_period,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
355
		.proc_handler	= sched_rt_handler,
Peter Zijlstra's avatar
Peter Zijlstra committed
356 357 358 359 360 361
	},
	{
		.procname	= "sched_rt_runtime_us",
		.data		= &sysctl_sched_rt_runtime,
		.maxlen		= sizeof(int),
		.mode		= 0644,
362
		.proc_handler	= sched_rt_handler,
Peter Zijlstra's avatar
Peter Zijlstra committed
363
	},
364 365 366 367 368
	{
		.procname	= "sched_compat_yield",
		.data		= &sysctl_sched_compat_yield,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
369
		.proc_handler	= proc_dointvec,
370
	},
371 372 373 374 375 376 377 378 379 380 381
#ifdef CONFIG_SCHED_AUTOGROUP
	{
		.procname	= "sched_autogroup_enabled",
		.data		= &sysctl_sched_autogroup_enabled,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
		.proc_handler	= proc_dointvec,
		.extra1		= &zero,
		.extra2		= &one,
	},
#endif
Peter Zijlstra's avatar
Peter Zijlstra committed
382 383 384 385 386 387
#ifdef CONFIG_PROVE_LOCKING
	{
		.procname	= "prove_locking",
		.data		= &prove_locking,
		.maxlen		= sizeof(int),
		.mode		= 0644,
388
		.proc_handler	= proc_dointvec,
Peter Zijlstra's avatar
Peter Zijlstra committed
389 390 391 392 393 394 395 396
	},
#endif
#ifdef CONFIG_LOCK_STAT
	{
		.procname	= "lock_stat",
		.data		= &lock_stat,
		.maxlen		= sizeof(int),
		.mode		= 0644,
397
		.proc_handler	= proc_dointvec,
Peter Zijlstra's avatar
Peter Zijlstra committed
398
	},
Ingo Molnar's avatar
Ingo Molnar committed
399
#endif
Linus Torvalds's avatar
Linus Torvalds committed
400 401 402 403 404
	{
		.procname	= "panic",
		.data		= &panic_timeout,
		.maxlen		= sizeof(int),
		.mode		= 0644,
405
		.proc_handler	= proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
406 407 408 409 410 411
	},
	{
		.procname	= "core_uses_pid",
		.data		= &core_uses_pid,
		.maxlen		= sizeof(int),
		.mode		= 0644,
412
		.proc_handler	= proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
413 414 415 416
	},
	{
		.procname	= "core_pattern",
		.data		= core_pattern,
417
		.maxlen		= CORENAME_MAX_SIZE,
Linus Torvalds's avatar
Linus Torvalds committed
418
		.mode		= 0644,
419
		.proc_handler	= proc_dostring,
Linus Torvalds's avatar
Linus Torvalds committed
420
	},
421 422 423 424 425
	{
		.procname	= "core_pipe_limit",
		.data		= &core_pipe_limit,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
426
		.proc_handler	= proc_dointvec,
427
	},
428
#ifdef CONFIG_PROC_SYSCTL
Linus Torvalds's avatar
Linus Torvalds committed
429 430
	{
		.procname	= "tainted",
Andi Kleen's avatar
Andi Kleen committed
431
		.maxlen 	= sizeof(long),
432
		.mode		= 0644,
433
		.proc_handler	= proc_taint,
Linus Torvalds's avatar
Linus Torvalds committed
434
	},
435
#endif
Arjan van de Ven's avatar
Arjan van de Ven committed
436 437 438 439 440 441
#ifdef CONFIG_LATENCYTOP
	{
		.procname	= "latencytop",
		.data		= &latencytop_enabled,
		.maxlen		= sizeof(int),
		.mode		= 0644,
442
		.proc_handler	= proc_dointvec,
Arjan van de Ven's avatar
Arjan van de Ven committed
443 444
	},
#endif
Linus Torvalds's avatar
Linus Torvalds committed
445 446 447 448 449 450
#ifdef CONFIG_BLK_DEV_INITRD
	{
		.procname	= "real-root-dev",
		.data		= &real_root_dev,
		.maxlen		= sizeof(int),
		.mode		= 0644,
451
		.proc_handler	= proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
452 453
	},
#endif
Ingo Molnar's avatar
Ingo Molnar committed
454 455 456 457 458
	{
		.procname	= "print-fatal-signals",
		.data		= &print_fatal_signals,
		.maxlen		= sizeof(int),
		.mode		= 0644,
459
		.proc_handler	= proc_dointvec,
Ingo Molnar's avatar
Ingo Molnar committed
460
	},
461
#ifdef CONFIG_SPARC
Linus Torvalds's avatar
Linus Torvalds committed
462 463 464 465 466
	{
		.procname	= "reboot-cmd",
		.data		= reboot_command,
		.maxlen		= 256,
		.mode		= 0644,
467
		.proc_handler	= proc_dostring,
Linus Torvalds's avatar
Linus Torvalds committed
468 469 470 471 472 473
	},
	{
		.procname	= "stop-a",
		.data		= &stop_a_enabled,
		.maxlen		= sizeof (int),
		.mode		= 0644,
474
		.proc_handler	= proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
475 476 477 478 479 480
	},
	{
		.procname	= "scons-poweroff",
		.data		= &scons_pwroff,
		.maxlen		= sizeof (int),
		.mode		= 0644,
481
		.proc_handler	= proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
482 483
	},
#endif
484 485 486 487 488 489
#ifdef CONFIG_SPARC64
	{
		.procname	= "tsb-ratio",
		.data		= &sysctl_tsb_ratio,
		.maxlen		= sizeof (int),
		.mode		= 0644,
490
		.proc_handler	= proc_dointvec,
491 492
	},
#endif
Linus Torvalds's avatar
Linus Torvalds committed
493 494 495 496 497 498
#ifdef __hppa__
	{
		.procname	= "soft-power",
		.data		= &pwrsw_enabled,
		.maxlen		= sizeof (int),
	 	.mode		= 0644,
499
		.proc_handler	= proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
500 501 502 503 504 505
	},
	{
		.procname	= "unaligned-trap",
		.data		= &unaligned_enabled,
		.maxlen		= sizeof (int),
		.mode		= 0644,
506
		.proc_handler	= proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
507 508 509 510 511 512 513
	},
#endif
	{
		.procname	= "ctrl-alt-del",
		.data		= &C_A_D,
		.maxlen		= sizeof(int),
		.mode		= 0644,
514
		.proc_handler	= proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
515
	},
516
#ifdef CONFIG_FUNCTION_TRACER
517 518 519 520 521
	{
		.procname	= "ftrace_enabled",
		.data		= &ftrace_enabled,
		.maxlen		= sizeof(int),
		.mode		= 0644,
522
		.proc_handler	= ftrace_enable_sysctl,
523 524
	},
#endif
525 526 527 528 529 530
#ifdef CONFIG_STACK_TRACER
	{
		.procname	= "stack_tracer_enabled",
		.data		= &stack_tracer_enabled,
		.maxlen		= sizeof(int),
		.mode		= 0644,
531
		.proc_handler	= stack_trace_sysctl,
532 533
	},
#endif
534 535
#ifdef CONFIG_TRACING
	{
Peter Zijlstra's avatar
Peter Zijlstra committed
536
		.procname	= "ftrace_dump_on_oops",
537 538 539
		.data		= &ftrace_dump_on_oops,
		.maxlen		= sizeof(int),
		.mode		= 0644,
540
		.proc_handler	= proc_dointvec,
541 542
	},
#endif
543
#ifdef CONFIG_MODULES
Linus Torvalds's avatar
Linus Torvalds committed
544 545 546 547 548
	{
		.procname	= "modprobe",
		.data		= &modprobe_path,
		.maxlen		= KMOD_PATH_LEN,
		.mode		= 0644,
549
		.proc_handler	= proc_dostring,
Linus Torvalds's avatar
Linus Torvalds committed
550
	},
551 552 553 554 555 556
	{
		.procname	= "modules_disabled",
		.data		= &modules_disabled,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		/* only handle a transition from default "0" to "1" */
557
		.proc_handler	= proc_dointvec_minmax,
558 559 560
		.extra1		= &one,
		.extra2		= &one,
	},
Linus Torvalds's avatar
Linus Torvalds committed
561
#endif
562
#ifdef CONFIG_HOTPLUG
Linus Torvalds's avatar
Linus Torvalds committed
563 564
	{
		.procname	= "hotplug",
565 566
		.data		= &uevent_helper,
		.maxlen		= UEVENT_HELPER_PATH_LEN,
Linus Torvalds's avatar
Linus Torvalds committed
567
		.mode		= 0644,
568
		.proc_handler	= proc_dostring,
Linus Torvalds's avatar
Linus Torvalds committed
569 570 571 572 573 574 575 576
	},
#endif
#ifdef CONFIG_CHR_DEV_SG
	{
		.procname	= "sg-big-buff",
		.data		= &sg_big_buff,
		.maxlen		= sizeof (int),
		.mode		= 0444,
577
		.proc_handler	= proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
578 579 580 581 582 583 584 585
	},
#endif
#ifdef CONFIG_BSD_PROCESS_ACCT
	{
		.procname	= "acct",
		.data		= &acct_parm,
		.maxlen		= 3*sizeof(int),
		.mode		= 0644,
586
		.proc_handler	= proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
587 588 589 590 591
	},
#endif
#ifdef CONFIG_MAGIC_SYSRQ
	{
		.procname	= "sysrq",
592
		.data		= &__sysrq_enabled,
Linus Torvalds's avatar
Linus Torvalds committed
593 594
		.maxlen		= sizeof (int),
		.mode		= 0644,
595
		.proc_handler	= sysrq_sysctl_handler,
Linus Torvalds's avatar
Linus Torvalds committed
596 597
	},
#endif
598
#ifdef CONFIG_PROC_SYSCTL
Linus Torvalds's avatar
Linus Torvalds committed
599 600
	{
		.procname	= "cad_pid",
601
		.data		= NULL,
Linus Torvalds's avatar
Linus Torvalds committed
602 603
		.maxlen		= sizeof (int),
		.mode		= 0600,
604
		.proc_handler	= proc_do_cad_pid,
Linus Torvalds's avatar
Linus Torvalds committed
605
	},
606
#endif
Linus Torvalds's avatar
Linus Torvalds committed
607 608 609 610 611
	{
		.procname	= "threads-max",
		.data		= &max_threads,
		.maxlen		= sizeof(int),
		.mode		= 0644,
612
		.proc_handler	= proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
613 614 615 616 617 618 619 620 621 622 623
	},
	{
		.procname	= "random",
		.mode		= 0555,
		.child		= random_table,
	},
	{
		.procname	= "overflowuid",
		.data		= &overflowuid,
		.maxlen		= sizeof(int),
		.mode		= 0644,
624
		.proc_handler	= proc_dointvec_minmax,
Linus Torvalds's avatar
Linus Torvalds committed
625 626 627 628 629 630 631 632
		.extra1		= &minolduid,
		.extra2		= &maxolduid,
	},
	{
		.procname	= "overflowgid",
		.data		= &overflowgid,
		.maxlen		= sizeof(int),
		.mode		= 0644,
633
		.proc_handler	= proc_dointvec_minmax,
Linus Torvalds's avatar
Linus Torvalds committed
634 635 636
		.extra1		= &minolduid,
		.extra2		= &maxolduid,
	},
637
#ifdef CONFIG_S390
Linus Torvalds's avatar
Linus Torvalds committed
638 639 640 641 642 643
#ifdef CONFIG_MATHEMU
	{
		.procname	= "ieee_emulation_warnings",
		.data		= &sysctl_ieee_emulation_warnings,
		.maxlen		= sizeof(int),
		.mode		= 0644,
644
		.proc_handler	= proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
645 646 647 648
	},
#endif
	{
		.procname	= "userprocess_debug",
649
		.data		= &show_unhandled_signals,
Linus Torvalds's avatar
Linus Torvalds committed
650 651
		.maxlen		= sizeof(int),
		.mode		= 0644,
652
		.proc_handler	= proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
653 654 655 656 657 658 659
	},
#endif
	{
		.procname	= "pid_max",
		.data		= &pid_max,
		.maxlen		= sizeof (int),
		.mode		= 0644,
660
		.proc_handler	= proc_dointvec_minmax,
Linus Torvalds's avatar
Linus Torvalds committed
661 662 663 664 665 666 667 668
		.extra1		= &pid_max_min,
		.extra2		= &pid_max_max,
	},
	{
		.procname	= "panic_on_oops",
		.data		= &panic_on_oops,
		.maxlen		= sizeof(int),
		.mode		= 0644,
669
		.proc_handler	= proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
670
	},
671 672 673 674 675 676
#if defined CONFIG_PRINTK
	{
		.procname	= "printk",
		.data		= &console_loglevel,
		.maxlen		= 4*sizeof(int),
		.mode		= 0644,
677
		.proc_handler	= proc_dointvec,
678
	},
Linus Torvalds's avatar
Linus Torvalds committed
679 680
	{
		.procname	= "printk_ratelimit",
Dave Young's avatar
Dave Young committed
681
		.data		= &printk_ratelimit_state.interval,
Linus Torvalds's avatar
Linus Torvalds committed
682 683
		.maxlen		= sizeof(int),
		.mode		= 0644,
684
		.proc_handler	= proc_dointvec_jiffies,
Linus Torvalds's avatar
Linus Torvalds committed
685 686 687
	},
	{
		.procname	= "printk_ratelimit_burst",
Dave Young's avatar
Dave Young committed
688
		.data		= &printk_ratelimit_state.burst,
Linus Torvalds's avatar
Linus Torvalds committed
689 690
		.maxlen		= sizeof(int),
		.mode		= 0644,
691
		.proc_handler	= proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
692
	},
693 694 695 696 697
	{
		.procname	= "printk_delay",
		.data		= &printk_delay_msec,
		.maxlen		= sizeof(int),
		.mode		= 0644,
698
		.proc_handler	= proc_dointvec_minmax,
699 700 701
		.extra1		= &zero,
		.extra2		= &ten_thousand,
	},
702 703 704 705 706 707 708 709 710
	{
		.procname	= "dmesg_restrict",
		.data		= &dmesg_restrict,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= proc_dointvec_minmax,
		.extra1		= &zero,
		.extra2		= &one,
	},
711 712 713 714 715 716 717 718 719
	{
		.procname	= "kptr_restrict",
		.data		= &kptr_restrict,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= proc_dointvec_minmax,
		.extra1		= &zero,
		.extra2		= &two,
	},
720
#endif
Linus Torvalds's avatar
Linus Torvalds committed
721 722 723 724 725
	{
		.procname	= "ngroups_max",
		.data		= &ngroups_max,
		.maxlen		= sizeof (int),
		.mode		= 0444,
726
		.proc_handler	= proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
727
	},
728
#if defined(CONFIG_LOCKUP_DETECTOR)
729
	{
730 731
		.procname       = "watchdog",
		.data           = &watchdog_enabled,
732 733
		.maxlen         = sizeof (int),
		.mode           = 0644,
734 735 736 737 738 739 740 741 742 743
		.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,
744
	},
745 746 747 748 749 750 751 752 753
	{
		.procname	= "softlockup_panic",
		.data		= &softlockup_panic,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= proc_dointvec_minmax,
		.extra1		= &zero,
		.extra2		= &one,
	},
754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769
	{
		.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,
	},
770
#endif
Linus Torvalds's avatar
Linus Torvalds committed
771
#if defined(CONFIG_X86)
772 773 774 775 776
	{
		.procname	= "panic_on_unrecovered_nmi",
		.data		= &panic_on_unrecovered_nmi,
		.maxlen		= sizeof(int),
		.mode		= 0644,
777
		.proc_handler	= proc_dointvec,
778
	},
779 780 781 782 783
	{
		.procname	= "panic_on_io_nmi",
		.data		= &panic_on_io_nmi,
		.maxlen		= sizeof(int),
		.mode		= 0644,
784
		.proc_handler	= proc_dointvec,
785
	},
Linus Torvalds's avatar
Linus Torvalds committed
786 787 788 789 790
	{
		.procname	= "bootloader_type",
		.data		= &bootloader_type,
		.maxlen		= sizeof (int),
		.mode		= 0444,
791
		.proc_handler	= proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
792
	},
793 794 795 796 797
	{
		.procname	= "bootloader_version",
		.data		= &bootloader_version,
		.maxlen		= sizeof (int),
		.mode		= 0444,
798
		.proc_handler	= proc_dointvec,
799
	},
800 801 802 803 804
	{
		.procname	= "kstack_depth_to_print",
		.data		= &kstack_depth_to_print,
		.maxlen		= sizeof(int),
		.mode		= 0644,
805
		.proc_handler	= proc_dointvec,
806
	},
807 808 809 810 811
	{
		.procname	= "io_delay_type",
		.data		= &io_delay_type,
		.maxlen		= sizeof(int),
		.mode		= 0644,
812
		.proc_handler	= proc_dointvec,
813
	},
Linus Torvalds's avatar
Linus Torvalds committed
814
#endif
815
#if defined(CONFIG_MMU)
Linus Torvalds's avatar
Linus Torvalds committed
816 817 818 819 820
	{
		.procname	= "randomize_va_space",
		.data		= &randomize_va_space,
		.maxlen		= sizeof(int),
		.mode		= 0644,
821
		.proc_handler	= proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
822
	},
823
#endif
824
#if defined(CONFIG_S390) && defined(CONFIG_SMP)
825 826 827 828 829
	{
		.procname	= "spin_retry",
		.data		= &spin_retry,
		.maxlen		= sizeof (int),
		.mode		= 0644,
830
		.proc_handler	= proc_dointvec,
831
	},
832
#endif
Len Brown's avatar
Len Brown committed
833
#if	defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
834 835
	{
		.procname	= "acpi_video_flags",
836
		.data		= &acpi_realmode_flags,
837 838
		.maxlen		= sizeof (unsigned long),
		.mode		= 0644,
839
		.proc_handler	= proc_doulongvec_minmax,
840
	},
841 842 843 844 845 846 847
#endif
#ifdef CONFIG_IA64
	{
		.procname	= "ignore-unaligned-usertrap",
		.data		= &no_unaligned_warning,
		.maxlen		= sizeof (int),
	 	.mode		= 0644,
848
		.proc_handler	= proc_dointvec,
849
	},
850 851 852 853 854
	{
		.procname	= "unaligned-dump-stack",
		.data		= &unaligned_dump_stack,
		.maxlen		= sizeof (int),
		.mode		= 0644,
855
		.proc_handler	= proc_dointvec,
856
	},
857
#endif
858 859 860 861 862 863
#ifdef CONFIG_DETECT_HUNG_TASK
	{
		.procname	= "hung_task_panic",
		.data		= &sysctl_hung_task_panic,
		.maxlen		= sizeof(int),
		.mode		= 0644,
864
		.proc_handler	= proc_dointvec_minmax,
865 866 867
		.extra1		= &zero,
		.extra2		= &one,
	},
868 869 870
	{
		.procname	= "hung_task_check_count",
		.data		= &sysctl_hung_task_check_count,
Ingo Molnar's avatar
Ingo Molnar committed
871
		.maxlen		= sizeof(unsigned long),
872
		.mode		= 0644,
873
		.proc_handler	= proc_doulongvec_minmax,
874 875 876 877
	},
	{
		.procname	= "hung_task_timeout_secs",
		.data		= &sysctl_hung_task_timeout_secs,
Ingo Molnar's avatar
Ingo Molnar committed
878
		.maxlen		= sizeof(unsigned long),
879
		.mode		= 0644,
880
		.proc_handler	= proc_dohung_task_timeout_secs,
881 882 883 884
	},
	{
		.procname	= "hung_task_warnings",
		.data		= &sysctl_hung_task_warnings,
Ingo Molnar's avatar
Ingo Molnar committed
885
		.maxlen		= sizeof(unsigned long),
886
		.mode		= 0644,
887
		.proc_handler	= proc_doulongvec_minmax,
888
	},
889
#endif
890 891 892 893 894 895
#ifdef CONFIG_COMPAT
	{
		.procname	= "compat-log",
		.data		= &compat_log,
		.maxlen		= sizeof (int),
	 	.mode		= 0644,
896
		.proc_handler	= proc_dointvec,
897
	},
898
#endif
Ingo Molnar's avatar
Ingo Molnar committed
899 900 901 902 903 904
#ifdef CONFIG_RT_MUTEXES
	{
		.procname	= "max_lock_depth",
		.data		= &max_lock_depth,
		.maxlen		= sizeof(int),
		.mode		= 0644,
905
		.proc_handler	= proc_dointvec,
Ingo Molnar's avatar
Ingo Molnar committed
906
	},
Kees Cook's avatar
Kees Cook committed
907
#endif
908 909 910 911 912
	{
		.procname	= "poweroff_cmd",
		.data		= &poweroff_cmd,
		.maxlen		= POWEROFF_CMD_PATH_LEN,
		.mode		= 0644,
913
		.proc_handler	= proc_dostring,
914
	},
915 916 917 918 919 920 921
#ifdef CONFIG_KEYS
	{
		.procname	= "keys",
		.mode		= 0555,
		.child		= key_sysctls,
	},
#endif
922 923 924 925 926 927
#ifdef CONFIG_RCU_TORTURE_TEST
	{
		.procname       = "rcutorture_runnable",
		.data           = &rcutorture_runnable,
		.maxlen         = sizeof(int),
		.mode           = 0644,
928
		.proc_handler	= proc_dointvec,
929 930
	},
#endif
931
#ifdef CONFIG_PERF_EVENTS
932
	{
933 934 935
		.procname	= "perf_event_paranoid",
		.data		= &sysctl_perf_event_paranoid,
		.maxlen		= sizeof(sysctl_perf_event_paranoid),
936
		.mode		= 0644,
937
		.proc_handler	= proc_dointvec,
938
	},
939
	{
940 941 942
		.procname	= "perf_event_mlock_kb",
		.data		= &sysctl_perf_event_mlock,
		.maxlen		= sizeof(sysctl_perf_event_mlock),
943
		.mode		= 0644,
944
		.proc_handler	= proc_dointvec,
945
	},
946
	{
947 948 949
		.procname	= "perf_event_max_sample_rate",
		.data		= &sysctl_perf_event_sample_rate,
		.maxlen		= sizeof(sysctl_perf_event_sample_rate),
950
		.mode		= 0644,
951
		.proc_handler	= proc_dointvec,
952
	},
953
#endif
954 955 956 957 958 959
#ifdef CONFIG_KMEMCHECK
	{
		.procname	= "kmemcheck",
		.data		= &kmemcheck_enabled,
		.maxlen		= sizeof(int),
		.mode		= 0644,
960
		.proc_handler	= proc_dointvec,