sysctl.c 58.4 KB
Newer Older
Linus Torvalds's avatar
Linus Torvalds committed
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25
/*
 * sysctl.c: General linux system control interface
 *
 * Begun 24 March 1995, Stephen Tweedie
 * Added /proc support, Dec 1995
 * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
 * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
 * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
 * Dynamic registration fixes, Stephen Tweedie.
 * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
 * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
 *  Horn.
 * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
 * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
 * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
 *  Wendling.
 * The list_for_each() macro wasn't appropriate for the sysctl loop.
 *  Removed it and replaced it with older style, 03/23/00, Bill Wendling
 */

#include <linux/module.h>
#include <linux/mm.h>
#include <linux/swap.h>
#include <linux/slab.h>
#include <linux/sysctl.h>
26
#include <linux/bitmap.h>
Dave Young's avatar
Dave Young committed
27
#include <linux/signal.h>
28
#include <linux/printk.h>
Linus Torvalds's avatar
Linus Torvalds committed
29
#include <linux/proc_fs.h>
30
#include <linux/security.h>
Linus Torvalds's avatar
Linus Torvalds committed
31
#include <linux/ctype.h>
32
#include <linux/kmemcheck.h>
33
#include <linux/kmemleak.h>
34
#include <linux/fs.h>
Linus Torvalds's avatar
Linus Torvalds committed
35 36
#include <linux/init.h>
#include <linux/kernel.h>
37
#include <linux/kobject.h>
38
#include <linux/net.h>
Linus Torvalds's avatar
Linus Torvalds committed
39 40 41
#include <linux/sysrq.h>
#include <linux/highuid.h>
#include <linux/writeback.h>
42
#include <linux/ratelimit.h>
43
#include <linux/compaction.h>
Linus Torvalds's avatar
Linus Torvalds committed
44 45
#include <linux/hugetlb.h>
#include <linux/initrd.h>
46
#include <linux/key.h>
Linus Torvalds's avatar
Linus Torvalds committed
47 48 49
#include <linux/times.h>
#include <linux/limits.h>
#include <linux/dcache.h>
50
#include <linux/dnotify.h>
Linus Torvalds's avatar
Linus Torvalds committed
51
#include <linux/syscalls.h>
Adrian Bunk's avatar
Adrian Bunk committed
52
#include <linux/vmstat.h>
53 54
#include <linux/nfs_fs.h>
#include <linux/acpi.h>
55
#include <linux/reboot.h>
56
#include <linux/ftrace.h>
57
#include <linux/perf_event.h>
58
#include <linux/kprobes.h>
59
#include <linux/pipe_fs_i.h>
60
#include <linux/oom.h>
61
#include <linux/kmod.h>
62
#include <linux/capability.h>
Al Viro's avatar
Al Viro committed
63
#include <linux/binfmts.h>
Linus Torvalds's avatar
Linus Torvalds committed
64 65 66 67

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

68 69
#ifdef CONFIG_X86
#include <asm/nmi.h>
70
#include <asm/stacktrace.h>
71
#include <asm/io.h>
72
#endif
73 74 75
#ifdef CONFIG_SPARC
#include <asm/setup.h>
#endif
Dave Young's avatar
Dave Young committed
76 77 78
#ifdef CONFIG_BSD_PROCESS_ACCT
#include <linux/acct.h>
#endif
Dave Young's avatar
Dave Young committed
79 80 81
#ifdef CONFIG_RT_MUTEXES
#include <linux/rtmutex.h>
#endif
Dave Young's avatar
Dave Young committed
82 83 84
#if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
#include <linux/lockdep.h>
#endif
Dave Young's avatar
Dave Young committed
85 86 87
#ifdef CONFIG_CHR_DEV_SG
#include <scsi/sg.h>
#endif
88

89
#ifdef CONFIG_LOCKUP_DETECTOR
90 91 92
#include <linux/nmi.h>
#endif

93

Linus Torvalds's avatar
Linus Torvalds committed
94 95 96 97 98 99
#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;
Alan Cox's avatar
Alan Cox committed
100
extern int suid_dumpable;
101 102
#ifdef CONFIG_COREDUMP
extern int core_uses_pid;
Linus Torvalds's avatar
Linus Torvalds committed
103
extern char core_pattern[];
104
extern unsigned int core_pipe_limit;
105
#endif
Linus Torvalds's avatar
Linus Torvalds committed
106 107 108
extern int pid_max;
extern int min_free_kbytes;
extern int pid_max_min, pid_max_max;
Andrew Morton's avatar
Andrew Morton committed
109
extern int sysctl_drop_caches;
110
extern int percpu_pagelist_fraction;
111
extern int compat_log;
Arjan van de Ven's avatar
Arjan van de Ven committed
112
extern int latencytop_enabled;
113
extern int sysctl_nr_open_min, sysctl_nr_open_max;
114 115 116
#ifndef CONFIG_MMU
extern int sysctl_nr_trim_pages;
#endif
117
#ifdef CONFIG_BLOCK
118
extern int blk_iopoll_enabled;
119
#endif
Linus Torvalds's avatar
Linus Torvalds committed
120

121
/* Constants used for minimum and  maximum */
122
#ifdef CONFIG_LOCKUP_DETECTOR
123
static int sixty = 60;
124
static int neg_one = -1;
125 126 127
#endif

static int zero;
128 129
static int __maybe_unused one = 1;
static int __maybe_unused two = 2;
130
static int __maybe_unused three = 3;
131
static unsigned long one_ul = 1;
132
static int one_hundred = 100;
133 134 135
#ifdef CONFIG_PRINTK
static int ten_thousand = 10000;
#endif
136

137 138 139
/* 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
140 141 142
/* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
static int maxolduid = 65535;
static int minolduid;
143
static int min_percpu_pagelist_fract = 8;
Linus Torvalds's avatar
Linus Torvalds committed
144 145

static int ngroups_max = NGROUPS_MAX;
146
static const int cap_last_cap = CAP_LAST_CAP;
Linus Torvalds's avatar
Linus Torvalds committed
147

Dave Young's avatar
Dave Young committed
148 149 150
#ifdef CONFIG_INOTIFY_USER
#include <linux/inotify.h>
#endif
151
#ifdef CONFIG_SPARC
Linus Torvalds's avatar
Linus Torvalds committed
152 153
#endif

154 155 156 157
#ifdef CONFIG_SPARC64
extern int sysctl_tsb_ratio;
#endif

Linus Torvalds's avatar
Linus Torvalds committed
158 159 160 161 162
#ifdef __hppa__
extern int pwrsw_enabled;
extern int unaligned_enabled;
#endif

163 164
#ifdef CONFIG_IA64
extern int no_unaligned_warning;
165
extern int unaligned_dump_stack;
166 167
#endif

168
#ifdef CONFIG_PROC_SYSCTL
169
static int proc_do_cad_pid(struct ctl_table *table, int write,
170
		  void __user *buffer, size_t *lenp, loff_t *ppos);
171
static int proc_taint(struct ctl_table *table, int write,
172
			       void __user *buffer, size_t *lenp, loff_t *ppos);
173
#endif
174

175
#ifdef CONFIG_PRINTK
176
static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
177 178 179
				void __user *buffer, size_t *lenp, loff_t *ppos);
#endif

180 181
static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
		void __user *buffer, size_t *lenp, loff_t *ppos);
182
#ifdef CONFIG_COREDUMP
183 184
static int proc_dostring_coredump(struct ctl_table *table, int write,
		void __user *buffer, size_t *lenp, loff_t *ppos);
185
#endif
186

187
#ifdef CONFIG_MAGIC_SYSRQ
188 189
/* Note: sysrq code uses it's own private copy */
static int __sysrq_enabled = SYSRQ_DEFAULT_ENABLE;
190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208

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

209 210 211 212 213 214
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[];
215 216 217
#ifdef CONFIG_EPOLL
extern struct ctl_table epoll_table[];
#endif
Linus Torvalds's avatar
Linus Torvalds committed
218 219 220 221 222 223 224

#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
int sysctl_legacy_va_layout;
#endif

/* The default sysctl tables: */

225
static struct ctl_table sysctl_base_table[] = {
Linus Torvalds's avatar
Linus Torvalds committed
226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250
	{
		.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,
	},
251
	{ }
Linus Torvalds's avatar
Linus Torvalds committed
252 253
};

Ingo Molnar's avatar
Ingo Molnar committed
254
#ifdef CONFIG_SCHED_DEBUG
255 256 257 258
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 */
259 260
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
261 262
#endif

263 264 265 266 267
#ifdef CONFIG_COMPACTION
static int min_extfrag_threshold;
static int max_extfrag_threshold = 1000;
#endif

268
static struct ctl_table kern_table[] = {
269 270 271 272 273
	{
		.procname	= "sched_child_runs_first",
		.data		= &sysctl_sched_child_runs_first,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
274
		.proc_handler	= proc_dointvec,
275
	},
Ingo Molnar's avatar
Ingo Molnar committed
276 277
#ifdef CONFIG_SCHED_DEBUG
	{
278 279
		.procname	= "sched_min_granularity_ns",
		.data		= &sysctl_sched_min_granularity,
Ingo Molnar's avatar
Ingo Molnar committed
280 281
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
282
		.proc_handler	= sched_proc_update_handler,
283 284
		.extra1		= &min_sched_granularity_ns,
		.extra2		= &max_sched_granularity_ns,
Ingo Molnar's avatar
Ingo Molnar committed
285
	},
286 287 288 289 290
	{
		.procname	= "sched_latency_ns",
		.data		= &sysctl_sched_latency,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
291
		.proc_handler	= sched_proc_update_handler,
292 293 294
		.extra1		= &min_sched_granularity_ns,
		.extra2		= &max_sched_granularity_ns,
	},
Ingo Molnar's avatar
Ingo Molnar committed
295 296 297 298 299
	{
		.procname	= "sched_wakeup_granularity_ns",
		.data		= &sysctl_sched_wakeup_granularity,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
300
		.proc_handler	= sched_proc_update_handler,
Ingo Molnar's avatar
Ingo Molnar committed
301 302 303
		.extra1		= &min_wakeup_granularity_ns,
		.extra2		= &max_wakeup_granularity_ns,
	},
304 305 306 307 308
	{
		.procname	= "sched_tunable_scaling",
		.data		= &sysctl_sched_tunable_scaling,
		.maxlen		= sizeof(enum sched_tunable_scaling),
		.mode		= 0644,
309
		.proc_handler	= sched_proc_update_handler,
310 311
		.extra1		= &min_sched_tunable_scaling,
		.extra2		= &max_sched_tunable_scaling,
312
	},
313
	{
314
		.procname	= "sched_migration_cost_ns",
315 316 317
		.data		= &sysctl_sched_migration_cost,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
318
		.proc_handler	= proc_dointvec,
319
	},
320 321 322 323
	{
		.procname	= "sched_nr_migrate",
		.data		= &sysctl_sched_nr_migrate,
		.maxlen		= sizeof(unsigned int),
Peter Zijlstra's avatar
Peter Zijlstra committed
324
		.mode		= 0644,
325
		.proc_handler	= proc_dointvec,
Peter Zijlstra's avatar
Peter Zijlstra committed
326
	},
327
	{
328
		.procname	= "sched_time_avg_ms",
329 330 331
		.data		= &sysctl_sched_time_avg,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
332
		.proc_handler	= proc_dointvec,
333
	},
334
	{
335
		.procname	= "sched_shares_window_ns",
336 337 338 339 340
		.data		= &sysctl_sched_shares_window,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
		.proc_handler	= proc_dointvec,
	},
341 342 343 344 345
	{
		.procname	= "timer_migration",
		.data		= &sysctl_timer_migration,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
346
		.proc_handler	= proc_dointvec_minmax,
347 348
		.extra1		= &zero,
		.extra2		= &one,
Peter Zijlstra's avatar
Peter Zijlstra committed
349
	},
350
#endif
Peter Zijlstra's avatar
Peter Zijlstra committed
351 352 353 354 355
	{
		.procname	= "sched_rt_period_us",
		.data		= &sysctl_sched_rt_period,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
356
		.proc_handler	= sched_rt_handler,
Peter Zijlstra's avatar
Peter Zijlstra committed
357 358 359 360 361 362
	},
	{
		.procname	= "sched_rt_runtime_us",
		.data		= &sysctl_sched_rt_runtime,
		.maxlen		= sizeof(int),
		.mode		= 0644,
363
		.proc_handler	= sched_rt_handler,
Peter Zijlstra's avatar
Peter Zijlstra committed
364
	},
365 366 367 368 369 370
#ifdef CONFIG_SCHED_AUTOGROUP
	{
		.procname	= "sched_autogroup_enabled",
		.data		= &sysctl_sched_autogroup_enabled,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
371
		.proc_handler	= proc_dointvec_minmax,
372 373 374 375
		.extra1		= &zero,
		.extra2		= &one,
	},
#endif
376 377 378 379 380 381 382 383 384 385
#ifdef CONFIG_CFS_BANDWIDTH
	{
		.procname	= "sched_cfs_bandwidth_slice_us",
		.data		= &sysctl_sched_cfs_bandwidth_slice,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
		.proc_handler	= proc_dointvec_minmax,
		.extra1		= &one,
	},
#endif
Peter Zijlstra's avatar
Peter Zijlstra committed
386 387 388 389 390 391
#ifdef CONFIG_PROVE_LOCKING
	{
		.procname	= "prove_locking",
		.data		= &prove_locking,
		.maxlen		= sizeof(int),
		.mode		= 0644,
392
		.proc_handler	= proc_dointvec,
Peter Zijlstra's avatar
Peter Zijlstra committed
393 394 395 396 397 398 399 400
	},
#endif
#ifdef CONFIG_LOCK_STAT
	{
		.procname	= "lock_stat",
		.data		= &lock_stat,
		.maxlen		= sizeof(int),
		.mode		= 0644,
401
		.proc_handler	= proc_dointvec,
Peter Zijlstra's avatar
Peter Zijlstra committed
402
	},
Ingo Molnar's avatar
Ingo Molnar committed
403
#endif
Linus Torvalds's avatar
Linus Torvalds committed
404 405 406 407 408
	{
		.procname	= "panic",
		.data		= &panic_timeout,
		.maxlen		= sizeof(int),
		.mode		= 0644,
409
		.proc_handler	= proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
410
	},
411
#ifdef CONFIG_COREDUMP
Linus Torvalds's avatar
Linus Torvalds committed
412 413 414 415 416
	{
		.procname	= "core_uses_pid",
		.data		= &core_uses_pid,
		.maxlen		= sizeof(int),
		.mode		= 0644,
417
		.proc_handler	= proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
418 419 420 421
	},
	{
		.procname	= "core_pattern",
		.data		= core_pattern,
422
		.maxlen		= CORENAME_MAX_SIZE,
Linus Torvalds's avatar
Linus Torvalds committed
423
		.mode		= 0644,
424
		.proc_handler	= proc_dostring_coredump,
Linus Torvalds's avatar
Linus Torvalds committed
425
	},
426 427 428 429 430
	{
		.procname	= "core_pipe_limit",
		.data		= &core_pipe_limit,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
431
		.proc_handler	= proc_dointvec,
432
	},
433
#endif
434
#ifdef CONFIG_PROC_SYSCTL
Linus Torvalds's avatar
Linus Torvalds committed
435 436
	{
		.procname	= "tainted",
Andi Kleen's avatar
Andi Kleen committed
437
		.maxlen 	= sizeof(long),
438
		.mode		= 0644,
439
		.proc_handler	= proc_taint,
Linus Torvalds's avatar
Linus Torvalds committed
440
	},
441
#endif
Arjan van de Ven's avatar
Arjan van de Ven committed
442 443 444 445 446 447
#ifdef CONFIG_LATENCYTOP
	{
		.procname	= "latencytop",
		.data		= &latencytop_enabled,
		.maxlen		= sizeof(int),
		.mode		= 0644,
448
		.proc_handler	= proc_dointvec,
Arjan van de Ven's avatar
Arjan van de Ven committed
449 450
	},
#endif
Linus Torvalds's avatar
Linus Torvalds committed
451 452 453 454 455 456
#ifdef CONFIG_BLK_DEV_INITRD
	{
		.procname	= "real-root-dev",
		.data		= &real_root_dev,
		.maxlen		= sizeof(int),
		.mode		= 0644,
457
		.proc_handler	= proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
458 459
	},
#endif
Ingo Molnar's avatar
Ingo Molnar committed
460 461 462 463 464
	{
		.procname	= "print-fatal-signals",
		.data		= &print_fatal_signals,
		.maxlen		= sizeof(int),
		.mode		= 0644,
465
		.proc_handler	= proc_dointvec,
Ingo Molnar's avatar
Ingo Molnar committed
466
	},
467
#ifdef CONFIG_SPARC
Linus Torvalds's avatar
Linus Torvalds committed
468 469 470 471 472
	{
		.procname	= "reboot-cmd",
		.data		= reboot_command,
		.maxlen		= 256,
		.mode		= 0644,
473
		.proc_handler	= proc_dostring,
Linus Torvalds's avatar
Linus Torvalds committed
474 475 476 477 478 479
	},
	{
		.procname	= "stop-a",
		.data		= &stop_a_enabled,
		.maxlen		= sizeof (int),
		.mode		= 0644,
480
		.proc_handler	= proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
481 482 483 484 485 486
	},
	{
		.procname	= "scons-poweroff",
		.data		= &scons_pwroff,
		.maxlen		= sizeof (int),
		.mode		= 0644,
487
		.proc_handler	= proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
488 489
	},
#endif
490 491 492 493 494 495
#ifdef CONFIG_SPARC64
	{
		.procname	= "tsb-ratio",
		.data		= &sysctl_tsb_ratio,
		.maxlen		= sizeof (int),
		.mode		= 0644,
496
		.proc_handler	= proc_dointvec,
497 498
	},
#endif
Linus Torvalds's avatar
Linus Torvalds committed
499 500 501 502 503 504
#ifdef __hppa__
	{
		.procname	= "soft-power",
		.data		= &pwrsw_enabled,
		.maxlen		= sizeof (int),
	 	.mode		= 0644,
505
		.proc_handler	= proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
506 507 508 509 510 511
	},
	{
		.procname	= "unaligned-trap",
		.data		= &unaligned_enabled,
		.maxlen		= sizeof (int),
		.mode		= 0644,
512
		.proc_handler	= proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
513 514 515 516 517 518 519
	},
#endif
	{
		.procname	= "ctrl-alt-del",
		.data		= &C_A_D,
		.maxlen		= sizeof(int),
		.mode		= 0644,
520
		.proc_handler	= proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
521
	},
522
#ifdef CONFIG_FUNCTION_TRACER
523 524 525 526 527
	{
		.procname	= "ftrace_enabled",
		.data		= &ftrace_enabled,
		.maxlen		= sizeof(int),
		.mode		= 0644,
528
		.proc_handler	= ftrace_enable_sysctl,
529 530
	},
#endif
531 532 533 534 535 536
#ifdef CONFIG_STACK_TRACER
	{
		.procname	= "stack_tracer_enabled",
		.data		= &stack_tracer_enabled,
		.maxlen		= sizeof(int),
		.mode		= 0644,
537
		.proc_handler	= stack_trace_sysctl,
538 539
	},
#endif
540 541
#ifdef CONFIG_TRACING
	{
Peter Zijlstra's avatar
Peter Zijlstra committed
542
		.procname	= "ftrace_dump_on_oops",
543 544 545
		.data		= &ftrace_dump_on_oops,
		.maxlen		= sizeof(int),
		.mode		= 0644,
546
		.proc_handler	= proc_dointvec,
547 548
	},
#endif
549
#ifdef CONFIG_MODULES
Linus Torvalds's avatar
Linus Torvalds committed
550 551 552 553 554
	{
		.procname	= "modprobe",
		.data		= &modprobe_path,
		.maxlen		= KMOD_PATH_LEN,
		.mode		= 0644,
555
		.proc_handler	= proc_dostring,
Linus Torvalds's avatar
Linus Torvalds committed
556
	},
557 558 559 560 561 562
	{
		.procname	= "modules_disabled",
		.data		= &modules_disabled,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		/* only handle a transition from default "0" to "1" */
563
		.proc_handler	= proc_dointvec_minmax,
564 565 566
		.extra1		= &one,
		.extra2		= &one,
	},
Linus Torvalds's avatar
Linus Torvalds committed
567
#endif
568
#ifdef CONFIG_HOTPLUG
Linus Torvalds's avatar
Linus Torvalds committed
569 570
	{
		.procname	= "hotplug",
571 572
		.data		= &uevent_helper,
		.maxlen		= UEVENT_HELPER_PATH_LEN,
Linus Torvalds's avatar
Linus Torvalds committed
573
		.mode		= 0644,
574
		.proc_handler	= proc_dostring,
Linus Torvalds's avatar
Linus Torvalds committed
575 576 577 578 579 580 581 582
	},
#endif
#ifdef CONFIG_CHR_DEV_SG
	{
		.procname	= "sg-big-buff",
		.data		= &sg_big_buff,
		.maxlen		= sizeof (int),
		.mode		= 0444,
583
		.proc_handler	= proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
584 585 586 587 588 589 590 591
	},
#endif
#ifdef CONFIG_BSD_PROCESS_ACCT
	{
		.procname	= "acct",
		.data		= &acct_parm,
		.maxlen		= 3*sizeof(int),
		.mode		= 0644,
592
		.proc_handler	= proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
593 594 595 596 597
	},
#endif
#ifdef CONFIG_MAGIC_SYSRQ
	{
		.procname	= "sysrq",
598
		.data		= &__sysrq_enabled,
Linus Torvalds's avatar
Linus Torvalds committed
599 600
		.maxlen		= sizeof (int),
		.mode		= 0644,
601
		.proc_handler	= sysrq_sysctl_handler,
Linus Torvalds's avatar
Linus Torvalds committed
602 603
	},
#endif
604
#ifdef CONFIG_PROC_SYSCTL
Linus Torvalds's avatar
Linus Torvalds committed
605 606
	{
		.procname	= "cad_pid",
607
		.data		= NULL,
Linus Torvalds's avatar
Linus Torvalds committed
608 609
		.maxlen		= sizeof (int),
		.mode		= 0600,
610
		.proc_handler	= proc_do_cad_pid,
Linus Torvalds's avatar
Linus Torvalds committed
611
	},
612
#endif
Linus Torvalds's avatar
Linus Torvalds committed
613 614 615 616 617
	{
		.procname	= "threads-max",
		.data		= &max_threads,
		.maxlen		= sizeof(int),
		.mode		= 0644,
618
		.proc_handler	= proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
619 620 621 622 623 624
	},
	{
		.procname	= "random",
		.mode		= 0555,
		.child		= random_table,
	},
625 626 627 628 629
	{
		.procname	= "usermodehelper",
		.mode		= 0555,
		.child		= usermodehelper_table,
	},
Linus Torvalds's avatar
Linus Torvalds committed
630 631 632 633 634
	{
		.procname	= "overflowuid",
		.data		= &overflowuid,
		.maxlen		= sizeof(int),
		.mode		= 0644,
635
		.proc_handler	= proc_dointvec_minmax,
Linus Torvalds's avatar
Linus Torvalds committed
636 637 638 639 640 641 642 643
		.extra1		= &minolduid,
		.extra2		= &maxolduid,
	},
	{
		.procname	= "overflowgid",
		.data		= &overflowgid,
		.maxlen		= sizeof(int),
		.mode		= 0644,
644
		.proc_handler	= proc_dointvec_minmax,
Linus Torvalds's avatar
Linus Torvalds committed
645 646 647
		.extra1		= &minolduid,
		.extra2		= &maxolduid,
	},
648
#ifdef CONFIG_S390
Linus Torvalds's avatar
Linus Torvalds committed
649 650 651 652 653 654
#ifdef CONFIG_MATHEMU
	{
		.procname	= "ieee_emulation_warnings",
		.data		= &sysctl_ieee_emulation_warnings,
		.maxlen		= sizeof(int),
		.mode		= 0644,
655
		.proc_handler	= proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
656 657 658 659
	},
#endif
	{
		.procname	= "userprocess_debug",
660
		.data		= &show_unhandled_signals,
Linus Torvalds's avatar
Linus Torvalds committed
661 662
		.maxlen		= sizeof(int),
		.mode		= 0644,
663
		.proc_handler	= proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
664 665 666 667 668 669 670
	},
#endif
	{
		.procname	= "pid_max",
		.data		= &pid_max,
		.maxlen		= sizeof (int),
		.mode		= 0644,
671
		.proc_handler	= proc_dointvec_minmax,
Linus Torvalds's avatar
Linus Torvalds committed
672 673 674 675 676 677 678 679
		.extra1		= &pid_max_min,
		.extra2		= &pid_max_max,
	},
	{
		.procname	= "panic_on_oops",
		.data		= &panic_on_oops,
		.maxlen		= sizeof(int),
		.mode		= 0644,
680
		.proc_handler	= proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
681
	},
682 683 684 685 686 687
#if defined CONFIG_PRINTK
	{
		.procname	= "printk",
		.data		= &console_loglevel,
		.maxlen		= 4*sizeof(int),
		.mode		= 0644,
688
		.proc_handler	= proc_dointvec,
689
	},
Linus Torvalds's avatar
Linus Torvalds committed
690 691
	{
		.procname	= "printk_ratelimit",
Dave Young's avatar
Dave Young committed
692
		.data		= &printk_ratelimit_state.interval,
Linus Torvalds's avatar
Linus Torvalds committed
693 694
		.maxlen		= sizeof(int),
		.mode		= 0644,
695
		.proc_handler	= proc_dointvec_jiffies,
Linus Torvalds's avatar
Linus Torvalds committed
696 697 698
	},
	{
		.procname	= "printk_ratelimit_burst",
Dave Young's avatar
Dave Young committed
699
		.data		= &printk_ratelimit_state.burst,
Linus Torvalds's avatar
Linus Torvalds committed
700 701
		.maxlen		= sizeof(int),
		.mode		= 0644,
702
		.proc_handler	= proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
703
	},
704 705 706 707 708
	{
		.procname	= "printk_delay",
		.data		= &printk_delay_msec,
		.maxlen		= sizeof(int),
		.mode		= 0644,
709
		.proc_handler	= proc_dointvec_minmax,
710 711 712
		.extra1		= &zero,
		.extra2		= &ten_thousand,
	},
713 714 715 716 717
	{
		.procname	= "dmesg_restrict",
		.data		= &dmesg_restrict,
		.maxlen		= sizeof(int),
		.mode		= 0644,
718
		.proc_handler	= proc_dointvec_minmax_sysadmin,
719 720 721
		.extra1		= &zero,
		.extra2		= &one,
	},
722 723 724 725 726
	{
		.procname	= "kptr_restrict",
		.data		= &kptr_restrict,
		.maxlen		= sizeof(int),
		.mode		= 0644,
727
		.proc_handler	= proc_dointvec_minmax_sysadmin,
728 729 730
		.extra1		= &zero,
		.extra2		= &two,
	},
731
#endif
Linus Torvalds's avatar
Linus Torvalds committed
732 733 734 735 736
	{
		.procname	= "ngroups_max",
		.data		= &ngroups_max,
		.maxlen		= sizeof (int),
		.mode		= 0444,
737
		.proc_handler	= proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
738
	},
739 740 741 742 743 744 745
	{
		.procname	= "cap_last_cap",
		.data		= (void *)&cap_last_cap,
		.maxlen		= sizeof(int),
		.mode		= 0444,
		.proc_handler	= proc_dointvec,
	},
746
#if defined(CONFIG_LOCKUP_DETECTOR)
747
	{
748 749
		.procname       = "watchdog",
		.data           = &watchdog_enabled,
750 751
		.maxlen         = sizeof (int),
		.mode           = 0644,
752 753 754
		.proc_handler   = proc_dowatchdog,
		.extra1		= &zero,
		.extra2		= &one,
755 756 757
	},
	{
		.procname	= "watchdog_thresh",
758
		.data		= &watchdog_thresh,
759 760
		.maxlen		= sizeof(int),
		.mode		= 0644,
761
		.proc_handler	= proc_dowatchdog,
762 763
		.extra1		= &neg_one,
		.extra2		= &sixty,
764
	},
765 766 767 768 769 770 771 772 773
	{
		.procname	= "softlockup_panic",
		.data		= &softlockup_panic,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= proc_dointvec_minmax,
		.extra1		= &zero,
		.extra2		= &one,
	},
774 775 776 777 778
	{
		.procname       = "nmi_watchdog",
		.data           = &watchdog_enabled,
		.maxlen         = sizeof (int),
		.mode           = 0644,
779 780 781
		.proc_handler   = proc_dowatchdog,
		.extra1		= &zero,
		.extra2		= &one,
782 783 784 785 786 787 788 789 790 791
	},
#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,
	},
792
#endif
Linus Torvalds's avatar
Linus Torvalds committed
793
#if defined(CONFIG_X86)
794 795 796 797 798
	{
		.procname	= "panic_on_unrecovered_nmi",
		.data		= &panic_on_unrecovered_nmi,
		.maxlen		= sizeof(int),
		.mode		= 0644,
799
		.proc_handler	= proc_dointvec,
800
	},
801 802 803 804 805
	{
		.procname	= "panic_on_io_nmi",
		.data		= &panic_on_io_nmi,
		.maxlen		= sizeof(int),
		.mode		= 0644,
806
		.proc_handler	= proc_dointvec,
807
	},
808 809 810 811 812 813 814 815 816
#ifdef CONFIG_DEBUG_STACKOVERFLOW
	{
		.procname	= "panic_on_stackoverflow",
		.data		= &sysctl_panic_on_stackoverflow,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= proc_dointvec,
	},
#endif
Linus Torvalds's avatar
Linus Torvalds committed
817 818 819 820 821
	{
		.procname	= "bootloader_type",
		.data		= &bootloader_type,
		.maxlen		= sizeof (int),
		.mode		= 0444,
822
		.proc_handler	= proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
823
	},
824 825 826 827 828
	{
		.procname	= "bootloader_version",
		.data		= &bootloader_version,
		.maxlen		= sizeof (int),
		.mode		= 0444,
829
		.proc_handler	= proc_dointvec,
830
	},
831 832 833 834 835
	{
		.procname	= "kstack_depth_to_print",
		.data		= &kstack_depth_to_print,
		.maxlen		= sizeof(int),
		.mode		= 0644,
836
		.proc_handler	= proc_dointvec,
837
	},
838 839 840 841 842
	{
		.procname	= "io_delay_type",
		.data		= &io_delay_type,
		.maxlen		= sizeof(int),
		.mode		= 0644,
843
		.proc_handler	= proc_dointvec,
844
	},
Linus Torvalds's avatar
Linus Torvalds committed
845
#endif
846
#if defined(CONFIG_MMU)
Linus Torvalds's avatar
Linus Torvalds committed
847 848 849 850 851
	{
		.procname	= "randomize_va_space",
		.data		= &randomize_va_space,
		.maxlen		= sizeof(int),
		.mode		= 0644,
852
		.proc_handler	= proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
853
	},
854
#endif
855
#if defined(CONFIG_S390) && defined(CONFIG_SMP)
856 857 858 859 860
	{
		.procname	= "spin_retry",
		.data		= &spin_retry,
		.maxlen		= sizeof (int),
		.mode		= 0644,
861
		.proc_handler	= proc_dointvec,
862
	},
863
#endif
Len Brown's avatar
Len Brown committed
864
#if	defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
865 866
	{
		.procname	= "acpi_video_flags",
867
		.data		= &acpi_realmode_flags,
868 869
		.maxlen		= sizeof (unsigned long),
		.mode		= 0644,
870
		.proc_handler	= proc_doulongvec_minmax,
871
	},
872 873 874 875 876 877 878
#endif
#ifdef CONFIG_IA64
	{
		.procname	= "ignore-unaligned-usertrap",
		.data		= &no_unaligned_warning,
		.maxlen		= sizeof (int),
	 	.mode		= 0644,
879
		.proc_handler	= proc_dointvec,
880
	},
881 882 883 884 885
	{
		.procname	= "unaligned-dump-stack",
		.data		= &unaligned_dump_stack,
		.maxlen		= sizeof (int),
		.mode		= 0644,
886
		.proc_handler	= proc_dointvec,
887
	},
888
#endif
889 890 891 892 893 894
#ifdef CONFIG_DETECT_HUNG_TASK
	{
		.procname	= "hung_task_panic",
		.data		= &sysctl_hung_task_panic,
		.maxlen		= sizeof(int),
		.mode		= 0644,
895
		.proc_handler	= proc_dointvec_minmax,
896 897 898
		.extra1		= &zero,
		.extra2		= &one,
	},
899 900 901
	{
		.procname	= "hung_task_check_count",
		.data		= &sysctl_hung_task_check_count,
Ingo Molnar's avatar
Ingo Molnar committed
902
		.maxlen		= sizeof(unsigned long),
903
		.mode		= 0644,
904
		.proc_handler	= proc_doulongvec_minmax,
905 906 907 908
	},
	{
		.procname	= "hung_task_timeout_secs",
		.data		= &sysctl_hung_task_timeout_secs,
Ingo Molnar's avatar
Ingo Molnar committed
909
		.maxlen		= sizeof(unsigned long),
910
		.mode		= 0644,
911
		.proc_handler	= proc_dohung_task_timeout_secs,
912 913 914 915
	},
	{
		.procname	= "hung_task_warnings",
		.data		= &sysctl_hung_task_warnings,
Ingo Molnar's avatar
Ingo Molnar committed
916
		.maxlen		= sizeof(unsigned long),
917
		.mode		= 0644,
918
		.proc_handler	= proc_doulongvec_minmax,
919
	},
920
#endif
921 922 923 924 925 926
#ifdef CONFIG_COMPAT
	{
		.procname	= "compat-log",
		.data		= &compat_log,
		.maxlen		= sizeof (int),
	 	.mode		= 0644,
927
		.proc_handler	= proc_dointvec,
928
	},
929
#endif
Ingo Molnar's avatar
Ingo Molnar committed
930 931 932 933 934 935
#ifdef CONFIG_RT_MUTEXES
	{
		.procname	= "max_lock_depth",
		.data		= &max_lock_depth,
		.maxlen		= sizeof(int),
		.mode		= 0644,
936
		.proc_handler	= proc_dointvec,
Ingo Molnar's avatar
Ingo Molnar committed
937
	},
Kees Cook's avatar
Kees Cook committed
938
#endif
939 940 941 942 943
	{
		.procname	= "poweroff_cmd",
		.data		= &poweroff_cmd,
		.maxlen		= POWEROFF_CMD_PATH_LEN,
		.mode		= 0644,
944
		.proc_handler	= proc_dostring,
945
	},
946 947 948 949 950 951 952
#ifdef CONFIG_KEYS
	{
		.procname	= "keys",
		.mode		= 0555,
		.child		= key_sysctls,
	},
#endif
953 954 955 956 957 958
#ifdef CONFIG_RCU_TORTURE_TEST
	{
		.procname       = "rcutorture_runnable",
		.data           = &rcutorture_runnable,
		.maxlen         = sizeof(int),
		.mode           = 0644,
959
		.proc_handler	= proc_dointvec,
960 961
	},
#endif
962
#ifdef CONFIG_PERF_EVENTS
963 964 965 966 967 968
	/*
	 * User-space scripts rely on the existence of this file
	 * as a feature check for perf_events being enabled.
	 *
	 * So it's an ABI, do not remove!
	 */
969
	{
970 971 972
		.procname	= "perf_event_paranoid",
		.data		= &sysctl_perf_event_paranoid,
		.maxlen		= sizeof(sysctl_perf_event_paranoid),
973
		.mode		= 0644,
974
		.proc_handler	= proc_dointvec,
975
	},
976
	{
977 978 979
		.procname	= "perf_event_mlock_kb",
		.data		= &sysctl_perf_event_mlock,
		.maxlen		= sizeof(sysctl_perf_event_mlock),
980
		.mode		= 0644,
981
		.proc_handler	= proc_dointvec,