sysctl.c 66.4 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
/*
 * 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>
22
#include <linux/aio.h>
Linus Torvalds's avatar
Linus Torvalds committed
23 24 25 26
#include <linux/mm.h>
#include <linux/swap.h>
#include <linux/slab.h>
#include <linux/sysctl.h>
27
#include <linux/bitmap.h>
Dave Young's avatar
Dave Young committed
28
#include <linux/signal.h>
29
#include <linux/printk.h>
Linus Torvalds's avatar
Linus Torvalds committed
30
#include <linux/proc_fs.h>
31
#include <linux/security.h>
Linus Torvalds's avatar
Linus Torvalds committed
32
#include <linux/ctype.h>
33
#include <linux/kmemcheck.h>
34
#include <linux/kmemleak.h>
35
#include <linux/fs.h>
Linus Torvalds's avatar
Linus Torvalds committed
36 37
#include <linux/init.h>
#include <linux/kernel.h>
38
#include <linux/kobject.h>
39
#include <linux/net.h>
Linus Torvalds's avatar
Linus Torvalds committed
40 41 42
#include <linux/sysrq.h>
#include <linux/highuid.h>
#include <linux/writeback.h>
43
#include <linux/ratelimit.h>
44
#include <linux/compaction.h>
Linus Torvalds's avatar
Linus Torvalds committed
45 46
#include <linux/hugetlb.h>
#include <linux/initrd.h>
47
#include <linux/key.h>
Linus Torvalds's avatar
Linus Torvalds committed
48 49 50
#include <linux/times.h>
#include <linux/limits.h>
#include <linux/dcache.h>
51
#include <linux/dnotify.h>
Linus Torvalds's avatar
Linus Torvalds committed
52
#include <linux/syscalls.h>
Adrian Bunk's avatar
Adrian Bunk committed
53
#include <linux/vmstat.h>
54 55
#include <linux/nfs_fs.h>
#include <linux/acpi.h>
56
#include <linux/reboot.h>
57
#include <linux/ftrace.h>
58
#include <linux/perf_event.h>
59
#include <linux/kprobes.h>
60
#include <linux/pipe_fs_i.h>
61
#include <linux/oom.h>
62
#include <linux/kmod.h>
63
#include <linux/capability.h>
Al Viro's avatar
Al Viro committed
64
#include <linux/binfmts.h>
65
#include <linux/sched/sysctl.h>
66
#include <linux/kexec.h>
67
#include <linux/bpf.h>
Linus Torvalds's avatar
Linus Torvalds committed
68 69 70 71

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

72 73
#ifdef CONFIG_X86
#include <asm/nmi.h>
74
#include <asm/stacktrace.h>
75
#include <asm/io.h>
76
#endif
77 78 79
#ifdef CONFIG_SPARC
#include <asm/setup.h>
#endif
Dave Young's avatar
Dave Young committed
80 81 82
#ifdef CONFIG_BSD_PROCESS_ACCT
#include <linux/acct.h>
#endif
Dave Young's avatar
Dave Young committed
83 84 85
#ifdef CONFIG_RT_MUTEXES
#include <linux/rtmutex.h>
#endif
Dave Young's avatar
Dave Young committed
86 87 88
#if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
#include <linux/lockdep.h>
#endif
Dave Young's avatar
Dave Young committed
89 90 91
#ifdef CONFIG_CHR_DEV_SG
#include <scsi/sg.h>
#endif
92

93
#ifdef CONFIG_LOCKUP_DETECTOR
94 95 96
#include <linux/nmi.h>
#endif

Linus Torvalds's avatar
Linus Torvalds committed
97 98 99
#if defined(CONFIG_SYSCTL)

/* External variables not in a header file. */
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
extern int pid_max;
extern int pid_max_min, pid_max_max;
108
extern int percpu_pagelist_fraction;
109
extern int compat_log;
Arjan van de Ven's avatar
Arjan van de Ven committed
110
extern int latencytop_enabled;
111
extern int sysctl_nr_open_min, sysctl_nr_open_max;
112 113 114
#ifndef CONFIG_MMU
extern int sysctl_nr_trim_pages;
#endif
Linus Torvalds's avatar
Linus Torvalds committed
115

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

121 122
static int __maybe_unused neg_one = -1;

123
static int zero;
124 125
static int __maybe_unused one = 1;
static int __maybe_unused two = 2;
126
static int __maybe_unused four = 4;
127
static unsigned long one_ul = 1;
128
static int one_hundred = 100;
129
static int one_thousand = 1000;
130 131 132
#ifdef CONFIG_PRINTK
static int ten_thousand = 10000;
#endif
133 134 135
#ifdef CONFIG_PERF_EVENTS
static int six_hundred_forty_kb = 640 * 1024;
#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
140 141 142 143 144
/* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
static int maxolduid = 65535;
static int minolduid;

static int ngroups_max = NGROUPS_MAX;
145
static const int cap_last_cap = CAP_LAST_CAP;
Linus Torvalds's avatar
Linus Torvalds committed
146

147 148 149 150 151
/*this is needed for proc_doulongvec_minmax of sysctl_hung_task_timeout_secs */
#ifdef CONFIG_DETECT_HUNG_TASK
static unsigned long hung_task_timeout_max = (LONG_MAX/HZ);
#endif

Dave Young's avatar
Dave Young committed
152 153 154
#ifdef CONFIG_INOTIFY_USER
#include <linux/inotify.h>
#endif
155
#ifdef CONFIG_SPARC
Linus Torvalds's avatar
Linus Torvalds committed
156 157 158 159
#endif

#ifdef __hppa__
extern int pwrsw_enabled;
160 161 162
#endif

#ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
Linus Torvalds's avatar
Linus Torvalds committed
163 164 165
extern int unaligned_enabled;
#endif

166
#ifdef CONFIG_IA64
167
extern int unaligned_dump_stack;
168 169
#endif

170 171 172 173
#ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
extern int no_unaligned_warning;
#endif

174
#ifdef CONFIG_PROC_SYSCTL
175 176 177 178 179

#define SYSCTL_WRITES_LEGACY	-1
#define SYSCTL_WRITES_WARN	 0
#define SYSCTL_WRITES_STRICT	 1

Kees Cook's avatar
Kees Cook committed
180
static int sysctl_writes_strict = SYSCTL_WRITES_STRICT;
181

182
static int proc_do_cad_pid(struct ctl_table *table, int write,
183
		  void __user *buffer, size_t *lenp, loff_t *ppos);
184
static int proc_taint(struct ctl_table *table, int write,
185
			       void __user *buffer, size_t *lenp, loff_t *ppos);
186
#endif
187

188
#ifdef CONFIG_PRINTK
189
static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
190 191 192
				void __user *buffer, size_t *lenp, loff_t *ppos);
#endif

193 194
static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
		void __user *buffer, size_t *lenp, loff_t *ppos);
195
#ifdef CONFIG_COREDUMP
196 197
static int proc_dostring_coredump(struct ctl_table *table, int write,
		void __user *buffer, size_t *lenp, loff_t *ppos);
198
#endif
199

200
#ifdef CONFIG_MAGIC_SYSRQ
201
/* Note: sysrq code uses it's own private copy */
202
static int __sysrq_enabled = CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE;
203

204
static int sysrq_sysctl_handler(struct ctl_table *table, int write,
205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221
				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

222 223 224 225 226 227
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[];
228 229 230
#ifdef CONFIG_EPOLL
extern struct ctl_table epoll_table[];
#endif
Linus Torvalds's avatar
Linus Torvalds committed
231 232 233 234 235 236 237

#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
int sysctl_legacy_va_layout;
#endif

/* The default sysctl tables: */

238
static struct ctl_table sysctl_base_table[] = {
Linus Torvalds's avatar
Linus Torvalds committed
239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263
	{
		.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,
	},
264
	{ }
Linus Torvalds's avatar
Linus Torvalds committed
265 266
};

Ingo Molnar's avatar
Ingo Molnar committed
267
#ifdef CONFIG_SCHED_DEBUG
268 269 270 271
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 */
272
#ifdef CONFIG_SMP
273 274
static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
275 276
#endif /* CONFIG_SMP */
#endif /* CONFIG_SCHED_DEBUG */
Ingo Molnar's avatar
Ingo Molnar committed
277

278 279 280 281 282
#ifdef CONFIG_COMPACTION
static int min_extfrag_threshold;
static int max_extfrag_threshold = 1000;
#endif

283
static struct ctl_table kern_table[] = {
284 285 286 287 288
	{
		.procname	= "sched_child_runs_first",
		.data		= &sysctl_sched_child_runs_first,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
289
		.proc_handler	= proc_dointvec,
290
	},
Ingo Molnar's avatar
Ingo Molnar committed
291 292
#ifdef CONFIG_SCHED_DEBUG
	{
293 294
		.procname	= "sched_min_granularity_ns",
		.data		= &sysctl_sched_min_granularity,
Ingo Molnar's avatar
Ingo Molnar committed
295 296
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
297
		.proc_handler	= sched_proc_update_handler,
298 299
		.extra1		= &min_sched_granularity_ns,
		.extra2		= &max_sched_granularity_ns,
Ingo Molnar's avatar
Ingo Molnar committed
300
	},
301 302 303 304 305
	{
		.procname	= "sched_latency_ns",
		.data		= &sysctl_sched_latency,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
306
		.proc_handler	= sched_proc_update_handler,
307 308 309
		.extra1		= &min_sched_granularity_ns,
		.extra2		= &max_sched_granularity_ns,
	},
Ingo Molnar's avatar
Ingo Molnar committed
310 311 312 313 314
	{
		.procname	= "sched_wakeup_granularity_ns",
		.data		= &sysctl_sched_wakeup_granularity,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
315
		.proc_handler	= sched_proc_update_handler,
Ingo Molnar's avatar
Ingo Molnar committed
316 317 318
		.extra1		= &min_wakeup_granularity_ns,
		.extra2		= &max_wakeup_granularity_ns,
	},
319
#ifdef CONFIG_SMP
320 321 322 323 324
	{
		.procname	= "sched_tunable_scaling",
		.data		= &sysctl_sched_tunable_scaling,
		.maxlen		= sizeof(enum sched_tunable_scaling),
		.mode		= 0644,
325
		.proc_handler	= sched_proc_update_handler,
326 327
		.extra1		= &min_sched_tunable_scaling,
		.extra2		= &max_sched_tunable_scaling,
328
	},
329
	{
330
		.procname	= "sched_migration_cost_ns",
331 332 333
		.data		= &sysctl_sched_migration_cost,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
334
		.proc_handler	= proc_dointvec,
335
	},
336 337 338 339
	{
		.procname	= "sched_nr_migrate",
		.data		= &sysctl_sched_nr_migrate,
		.maxlen		= sizeof(unsigned int),
Peter Zijlstra's avatar
Peter Zijlstra committed
340
		.mode		= 0644,
341
		.proc_handler	= proc_dointvec,
Peter Zijlstra's avatar
Peter Zijlstra committed
342
	},
343
	{
344
		.procname	= "sched_time_avg_ms",
345 346 347
		.data		= &sysctl_sched_time_avg,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
348
		.proc_handler	= proc_dointvec,
349
	},
350
	{
351
		.procname	= "sched_shares_window_ns",
352 353 354 355 356
		.data		= &sysctl_sched_shares_window,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
		.proc_handler	= proc_dointvec,
	},
357 358 359 360 361 362 363 364 365 366 367
#ifdef CONFIG_SCHEDSTATS
	{
		.procname	= "sched_schedstats",
		.data		= NULL,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
		.proc_handler	= sysctl_schedstats,
		.extra1		= &zero,
		.extra2		= &one,
	},
#endif /* CONFIG_SCHEDSTATS */
368 369
#endif /* CONFIG_SMP */
#ifdef CONFIG_NUMA_BALANCING
370 371 372 373 374 375 376
	{
		.procname	= "numa_balancing_scan_delay_ms",
		.data		= &sysctl_numa_balancing_scan_delay,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
		.proc_handler	= proc_dointvec,
	},
377 378 379 380 381 382 383 384 385 386 387 388 389 390
	{
		.procname	= "numa_balancing_scan_period_min_ms",
		.data		= &sysctl_numa_balancing_scan_period_min,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
		.proc_handler	= proc_dointvec,
	},
	{
		.procname	= "numa_balancing_scan_period_max_ms",
		.data		= &sysctl_numa_balancing_scan_period_max,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
		.proc_handler	= proc_dointvec,
	},
391 392 393 394 395
	{
		.procname	= "numa_balancing_scan_size_mb",
		.data		= &sysctl_numa_balancing_scan_size,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
396 397
		.proc_handler	= proc_dointvec_minmax,
		.extra1		= &one,
398
	},
399 400 401 402 403 404 405 406 407
	{
		.procname	= "numa_balancing",
		.data		= NULL, /* filled in by handler */
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
		.proc_handler	= sysctl_numa_balancing,
		.extra1		= &zero,
		.extra2		= &one,
	},
408 409
#endif /* CONFIG_NUMA_BALANCING */
#endif /* CONFIG_SCHED_DEBUG */
Peter Zijlstra's avatar
Peter Zijlstra committed
410 411 412 413 414
	{
		.procname	= "sched_rt_period_us",
		.data		= &sysctl_sched_rt_period,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
415
		.proc_handler	= sched_rt_handler,
Peter Zijlstra's avatar
Peter Zijlstra committed
416 417 418 419 420 421
	},
	{
		.procname	= "sched_rt_runtime_us",
		.data		= &sysctl_sched_rt_runtime,
		.maxlen		= sizeof(int),
		.mode		= 0644,
422
		.proc_handler	= sched_rt_handler,
Peter Zijlstra's avatar
Peter Zijlstra committed
423
	},
424 425 426 427 428 429 430
	{
		.procname	= "sched_rr_timeslice_ms",
		.data		= &sched_rr_timeslice,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= sched_rr_handler,
	},
431 432 433 434 435 436
#ifdef CONFIG_SCHED_AUTOGROUP
	{
		.procname	= "sched_autogroup_enabled",
		.data		= &sysctl_sched_autogroup_enabled,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
437
		.proc_handler	= proc_dointvec_minmax,
438 439 440 441
		.extra1		= &zero,
		.extra2		= &one,
	},
#endif
442 443 444 445 446 447 448 449 450 451
#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
452 453 454 455 456 457
#ifdef CONFIG_PROVE_LOCKING
	{
		.procname	= "prove_locking",
		.data		= &prove_locking,
		.maxlen		= sizeof(int),
		.mode		= 0644,
458
		.proc_handler	= proc_dointvec,
Peter Zijlstra's avatar
Peter Zijlstra committed
459 460 461 462 463 464 465 466
	},
#endif
#ifdef CONFIG_LOCK_STAT
	{
		.procname	= "lock_stat",
		.data		= &lock_stat,
		.maxlen		= sizeof(int),
		.mode		= 0644,
467
		.proc_handler	= proc_dointvec,
Peter Zijlstra's avatar
Peter Zijlstra committed
468
	},
Ingo Molnar's avatar
Ingo Molnar committed
469
#endif
Linus Torvalds's avatar
Linus Torvalds committed
470 471 472 473 474
	{
		.procname	= "panic",
		.data		= &panic_timeout,
		.maxlen		= sizeof(int),
		.mode		= 0644,
475
		.proc_handler	= proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
476
	},
477
#ifdef CONFIG_COREDUMP
Linus Torvalds's avatar
Linus Torvalds committed
478 479 480 481 482
	{
		.procname	= "core_uses_pid",
		.data		= &core_uses_pid,
		.maxlen		= sizeof(int),
		.mode		= 0644,
483
		.proc_handler	= proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
484 485 486 487
	},
	{
		.procname	= "core_pattern",
		.data		= core_pattern,
488
		.maxlen		= CORENAME_MAX_SIZE,
Linus Torvalds's avatar
Linus Torvalds committed
489
		.mode		= 0644,
490
		.proc_handler	= proc_dostring_coredump,
Linus Torvalds's avatar
Linus Torvalds committed
491
	},
492 493 494 495 496
	{
		.procname	= "core_pipe_limit",
		.data		= &core_pipe_limit,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
497
		.proc_handler	= proc_dointvec,
498
	},
499
#endif
500
#ifdef CONFIG_PROC_SYSCTL
Linus Torvalds's avatar
Linus Torvalds committed
501 502
	{
		.procname	= "tainted",
Andi Kleen's avatar
Andi Kleen committed
503
		.maxlen 	= sizeof(long),
504
		.mode		= 0644,
505
		.proc_handler	= proc_taint,
Linus Torvalds's avatar
Linus Torvalds committed
506
	},
507 508 509 510 511 512 513 514 515
	{
		.procname	= "sysctl_writes_strict",
		.data		= &sysctl_writes_strict,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= proc_dointvec_minmax,
		.extra1		= &neg_one,
		.extra2		= &one,
	},
516
#endif
Arjan van de Ven's avatar
Arjan van de Ven committed
517 518 519 520 521 522
#ifdef CONFIG_LATENCYTOP
	{
		.procname	= "latencytop",
		.data		= &latencytop_enabled,
		.maxlen		= sizeof(int),
		.mode		= 0644,
523
		.proc_handler	= sysctl_latencytop,
Arjan van de Ven's avatar
Arjan van de Ven committed
524 525
	},
#endif
Linus Torvalds's avatar
Linus Torvalds committed
526 527 528 529 530 531
#ifdef CONFIG_BLK_DEV_INITRD
	{
		.procname	= "real-root-dev",
		.data		= &real_root_dev,
		.maxlen		= sizeof(int),
		.mode		= 0644,
532
		.proc_handler	= proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
533 534
	},
#endif
Ingo Molnar's avatar
Ingo Molnar committed
535 536 537 538 539
	{
		.procname	= "print-fatal-signals",
		.data		= &print_fatal_signals,
		.maxlen		= sizeof(int),
		.mode		= 0644,
540
		.proc_handler	= proc_dointvec,
Ingo Molnar's avatar
Ingo Molnar committed
541
	},
542
#ifdef CONFIG_SPARC
Linus Torvalds's avatar
Linus Torvalds committed
543 544 545 546 547
	{
		.procname	= "reboot-cmd",
		.data		= reboot_command,
		.maxlen		= 256,
		.mode		= 0644,
548
		.proc_handler	= proc_dostring,
Linus Torvalds's avatar
Linus Torvalds committed
549 550 551 552 553 554
	},
	{
		.procname	= "stop-a",
		.data		= &stop_a_enabled,
		.maxlen		= sizeof (int),
		.mode		= 0644,
555
		.proc_handler	= proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
556 557 558 559 560 561
	},
	{
		.procname	= "scons-poweroff",
		.data		= &scons_pwroff,
		.maxlen		= sizeof (int),
		.mode		= 0644,
562
		.proc_handler	= proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
563 564
	},
#endif
565 566 567 568 569 570
#ifdef CONFIG_SPARC64
	{
		.procname	= "tsb-ratio",
		.data		= &sysctl_tsb_ratio,
		.maxlen		= sizeof (int),
		.mode		= 0644,
571
		.proc_handler	= proc_dointvec,
572 573
	},
#endif
Linus Torvalds's avatar
Linus Torvalds committed
574 575 576 577 578 579
#ifdef __hppa__
	{
		.procname	= "soft-power",
		.data		= &pwrsw_enabled,
		.maxlen		= sizeof (int),
	 	.mode		= 0644,
580
		.proc_handler	= proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
581
	},
582 583
#endif
#ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
Linus Torvalds's avatar
Linus Torvalds committed
584 585 586 587 588
	{
		.procname	= "unaligned-trap",
		.data		= &unaligned_enabled,
		.maxlen		= sizeof (int),
		.mode		= 0644,
589
		.proc_handler	= proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
590 591 592 593 594 595 596
	},
#endif
	{
		.procname	= "ctrl-alt-del",
		.data		= &C_A_D,
		.maxlen		= sizeof(int),
		.mode		= 0644,
597
		.proc_handler	= proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
598
	},
599
#ifdef CONFIG_FUNCTION_TRACER
600 601 602 603 604
	{
		.procname	= "ftrace_enabled",
		.data		= &ftrace_enabled,
		.maxlen		= sizeof(int),
		.mode		= 0644,
605
		.proc_handler	= ftrace_enable_sysctl,
606 607
	},
#endif
608 609 610 611 612 613
#ifdef CONFIG_STACK_TRACER
	{
		.procname	= "stack_tracer_enabled",
		.data		= &stack_tracer_enabled,
		.maxlen		= sizeof(int),
		.mode		= 0644,
614
		.proc_handler	= stack_trace_sysctl,
615 616
	},
#endif
617 618
#ifdef CONFIG_TRACING
	{
Peter Zijlstra's avatar
Peter Zijlstra committed
619
		.procname	= "ftrace_dump_on_oops",
620 621 622
		.data		= &ftrace_dump_on_oops,
		.maxlen		= sizeof(int),
		.mode		= 0644,
623
		.proc_handler	= proc_dointvec,
624
	},
625 626 627 628 629 630 631
	{
		.procname	= "traceoff_on_warning",
		.data		= &__disable_trace_on_warning,
		.maxlen		= sizeof(__disable_trace_on_warning),
		.mode		= 0644,
		.proc_handler	= proc_dointvec,
	},
632 633 634 635 636 637 638
	{
		.procname	= "tracepoint_printk",
		.data		= &tracepoint_printk,
		.maxlen		= sizeof(tracepoint_printk),
		.mode		= 0644,
		.proc_handler	= proc_dointvec,
	},
639
#endif
640
#ifdef CONFIG_KEXEC_CORE
641 642 643 644 645 646 647 648 649 650 651
	{
		.procname	= "kexec_load_disabled",
		.data		= &kexec_load_disabled,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		/* only handle a transition from default "0" to "1" */
		.proc_handler	= proc_dointvec_minmax,
		.extra1		= &one,
		.extra2		= &one,
	},
#endif
652
#ifdef CONFIG_MODULES
Linus Torvalds's avatar
Linus Torvalds committed
653 654 655 656 657
	{
		.procname	= "modprobe",
		.data		= &modprobe_path,
		.maxlen		= KMOD_PATH_LEN,
		.mode		= 0644,
658
		.proc_handler	= proc_dostring,
Linus Torvalds's avatar
Linus Torvalds committed
659
	},
660 661 662 663 664 665
	{
		.procname	= "modules_disabled",
		.data		= &modules_disabled,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		/* only handle a transition from default "0" to "1" */
666
		.proc_handler	= proc_dointvec_minmax,
667 668 669
		.extra1		= &one,
		.extra2		= &one,
	},
Linus Torvalds's avatar
Linus Torvalds committed
670
#endif
671
#ifdef CONFIG_UEVENT_HELPER
Linus Torvalds's avatar
Linus Torvalds committed
672 673
	{
		.procname	= "hotplug",
674 675
		.data		= &uevent_helper,
		.maxlen		= UEVENT_HELPER_PATH_LEN,
Linus Torvalds's avatar
Linus Torvalds committed
676
		.mode		= 0644,
677
		.proc_handler	= proc_dostring,
Linus Torvalds's avatar
Linus Torvalds committed
678
	},
679
#endif
Linus Torvalds's avatar
Linus Torvalds committed
680 681 682 683 684 685
#ifdef CONFIG_CHR_DEV_SG
	{
		.procname	= "sg-big-buff",
		.data		= &sg_big_buff,
		.maxlen		= sizeof (int),
		.mode		= 0444,
686
		.proc_handler	= proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
687 688 689 690 691 692 693 694
	},
#endif
#ifdef CONFIG_BSD_PROCESS_ACCT
	{
		.procname	= "acct",
		.data		= &acct_parm,
		.maxlen		= 3*sizeof(int),
		.mode		= 0644,
695
		.proc_handler	= proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
696 697 698 699 700
	},
#endif
#ifdef CONFIG_MAGIC_SYSRQ
	{
		.procname	= "sysrq",
701
		.data		= &__sysrq_enabled,
Linus Torvalds's avatar
Linus Torvalds committed
702 703
		.maxlen		= sizeof (int),
		.mode		= 0644,
704
		.proc_handler	= sysrq_sysctl_handler,
Linus Torvalds's avatar
Linus Torvalds committed
705 706
	},
#endif
707
#ifdef CONFIG_PROC_SYSCTL
Linus Torvalds's avatar
Linus Torvalds committed
708 709
	{
		.procname	= "cad_pid",
710
		.data		= NULL,
Linus Torvalds's avatar
Linus Torvalds committed
711 712
		.maxlen		= sizeof (int),
		.mode		= 0600,
713
		.proc_handler	= proc_do_cad_pid,
Linus Torvalds's avatar
Linus Torvalds committed
714
	},
715
#endif
Linus Torvalds's avatar
Linus Torvalds committed
716 717
	{
		.procname	= "threads-max",
718
		.data		= NULL,
Linus Torvalds's avatar
Linus Torvalds committed
719 720
		.maxlen		= sizeof(int),
		.mode		= 0644,
721
		.proc_handler	= sysctl_max_threads,
Linus Torvalds's avatar
Linus Torvalds committed
722 723 724 725 726 727
	},
	{
		.procname	= "random",
		.mode		= 0555,
		.child		= random_table,
	},
728 729 730 731 732
	{
		.procname	= "usermodehelper",
		.mode		= 0555,
		.child		= usermodehelper_table,
	},
Linus Torvalds's avatar
Linus Torvalds committed
733 734 735 736 737
	{
		.procname	= "overflowuid",
		.data		= &overflowuid,
		.maxlen		= sizeof(int),
		.mode		= 0644,
738
		.proc_handler	= proc_dointvec_minmax,
Linus Torvalds's avatar
Linus Torvalds committed
739 740 741 742 743 744 745 746
		.extra1		= &minolduid,
		.extra2		= &maxolduid,
	},
	{
		.procname	= "overflowgid",
		.data		= &overflowgid,
		.maxlen		= sizeof(int),
		.mode		= 0644,
747
		.proc_handler	= proc_dointvec_minmax,
Linus Torvalds's avatar
Linus Torvalds committed
748 749 750
		.extra1		= &minolduid,
		.extra2		= &maxolduid,
	},
751
#ifdef CONFIG_S390
Linus Torvalds's avatar
Linus Torvalds committed
752 753 754 755 756 757
#ifdef CONFIG_MATHEMU
	{
		.procname	= "ieee_emulation_warnings",
		.data		= &sysctl_ieee_emulation_warnings,
		.maxlen		= sizeof(int),
		.mode		= 0644,
758
		.proc_handler	= proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
759 760 761 762
	},
#endif
	{
		.procname	= "userprocess_debug",
763
		.data		= &show_unhandled_signals,
Linus Torvalds's avatar
Linus Torvalds committed
764 765
		.maxlen		= sizeof(int),
		.mode		= 0644,
766
		.proc_handler	= proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
767 768 769 770 771 772 773
	},
#endif
	{
		.procname	= "pid_max",
		.data		= &pid_max,
		.maxlen		= sizeof (int),
		.mode		= 0644,
774
		.proc_handler	= proc_dointvec_minmax,
Linus Torvalds's avatar
Linus Torvalds committed
775 776 777 778 779 780 781 782
		.extra1		= &pid_max_min,
		.extra2		= &pid_max_max,
	},
	{
		.procname	= "panic_on_oops",
		.data		= &panic_on_oops,
		.maxlen		= sizeof(int),
		.mode		= 0644,
783
		.proc_handler	= proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
784
	},
785 786 787 788 789 790
#if defined CONFIG_PRINTK
	{
		.procname	= "printk",
		.data		= &console_loglevel,
		.maxlen		= 4*sizeof(int),
		.mode		= 0644,
791
		.proc_handler	= proc_dointvec,
792
	},
Linus Torvalds's avatar
Linus Torvalds committed
793 794
	{
		.procname	= "printk_ratelimit",
Dave Young's avatar
Dave Young committed
795
		.data		= &printk_ratelimit_state.interval,
Linus Torvalds's avatar
Linus Torvalds committed
796 797
		.maxlen		= sizeof(int),
		.mode		= 0644,
798
		.proc_handler	= proc_dointvec_jiffies,
Linus Torvalds's avatar
Linus Torvalds committed
799 800 801
	},
	{
		.procname	= "printk_ratelimit_burst",
Dave Young's avatar
Dave Young committed
802
		.data		= &printk_ratelimit_state.burst,
Linus Torvalds's avatar
Linus Torvalds committed
803 804
		.maxlen		= sizeof(int),
		.mode		= 0644,
805
		.proc_handler	= proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
806
	},
807 808 809 810 811
	{
		.procname	= "printk_delay",
		.data		= &printk_delay_msec,
		.maxlen		= sizeof(int),
		.mode		= 0644,
812
		.proc_handler	= proc_dointvec_minmax,
813 814 815
		.extra1		= &zero,
		.extra2		= &ten_thousand,
	},
816 817 818 819 820
	{
		.procname	= "dmesg_restrict",
		.data		= &dmesg_restrict,
		.maxlen		= sizeof(int),
		.mode		= 0644,
821
		.proc_handler	= proc_dointvec_minmax_sysadmin,
822 823 824
		.extra1		= &zero,
		.extra2		= &one,
	},
825 826 827 828 829
	{
		.procname	= "kptr_restrict",
		.data		= &kptr_restrict,
		.maxlen		= sizeof(int),
		.mode		= 0644,
830
		.proc_handler	= proc_dointvec_minmax_sysadmin,
831 832 833
		.extra1		= &zero,
		.extra2		= &two,
	},
834
#endif
Linus Torvalds's avatar
Linus Torvalds committed
835 836 837 838 839
	{
		.procname	= "ngroups_max",
		.data		= &ngroups_max,
		.maxlen		= sizeof (int),
		.mode		= 0444,
840
		.proc_handler	= proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
841
	},
842 843 844 845 846 847 848
	{
		.procname	= "cap_last_cap",
		.data		= (void *)&cap_last_cap,
		.maxlen		= sizeof(int),
		.mode		= 0444,
		.proc_handler	= proc_dointvec,
	},
849
#if defined(CONFIG_LOCKUP_DETECTOR)
850
	{
851
		.procname       = "watchdog",
852
		.data           = &watchdog_user_enabled,
853 854
		.maxlen         = sizeof (int),
		.mode           = 0644,
855
		.proc_handler   = proc_watchdog,
856 857
		.extra1		= &zero,
		.extra2		= &one,
858 859 860
	},
	{
		.procname	= "watchdog_thresh",
861
		.data		= &watchdog_thresh,
862 863
		.maxlen		= sizeof(int),
		.mode		= 0644,
864
		.proc_handler	= proc_watchdog_thresh,
865
		.extra1		= &zero,
866
		.extra2		= &sixty,
867
	},
868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889
	{
		.procname       = "nmi_watchdog",
		.data           = &nmi_watchdog_enabled,
		.maxlen         = sizeof (int),
		.mode           = 0644,
		.proc_handler   = proc_nmi_watchdog,
		.extra1		= &zero,
#if defined(CONFIG_HAVE_NMI_WATCHDOG) || defined(CONFIG_HARDLOCKUP_DETECTOR)
		.extra2		= &one,
#else
		.extra2		= &zero,
#endif
	},
	{
		.procname       = "soft_watchdog",
		.data           = &soft_watchdog_enabled,
		.maxlen         = sizeof (int),
		.mode           = 0644,
		.proc_handler   = proc_soft_watchdog,
		.extra1		= &zero,
		.extra2		= &one,
	},
890 891 892 893 894 895 896
	{
		.procname	= "watchdog_cpumask",
		.data		= &watchdog_cpumask_bits,
		.maxlen		= NR_CPUS,
		.mode		= 0644,
		.proc_handler	= proc_watchdog_cpumask,
	},
897 898 899 900 901 902 903 904 905
	{
		.procname	= "softlockup_panic",
		.data		= &softlockup_panic,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= proc_dointvec_minmax,
		.extra1		= &zero,
		.extra2		= &one,
	},
906 907 908 909 910 911 912 913 914 915 916
#ifdef CONFIG_HARDLOCKUP_DETECTOR
	{
		.procname	= "hardlockup_panic",
		.data		= &hardlockup_panic,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= proc_dointvec_minmax,
		.extra1		= &zero,
		.extra2		= &one,
	},
#endif
917 918 919 920 921 922 923 924 925 926
#ifdef CONFIG_SMP
	{
		.procname	= "softlockup_all_cpu_backtrace",
		.data		= &sysctl_softlockup_all_cpu_backtrace,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= proc_dointvec_minmax,
		.extra1		= &zero,
		.extra2		= &one,
	},
927 928 929 930 931 932 933 934 935
	{
		.procname	= "hardlockup_all_cpu_backtrace",
		.data		= &sysctl_hardlockup_all_cpu_backtrace,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= proc_dointvec_minmax,
		.extra1		= &zero,
		.extra2		= &one,
	},
936
#endif /* CONFIG_SMP */
937 938 939 940 941 942 943 944 945
#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,
	},
946
#endif
Linus Torvalds's avatar
Linus Torvalds committed
947
#if defined(CONFIG_X86)
948 949 950 951 952
	{
		.procname	= "panic_on_unrecovered_nmi",
		.data		= &panic_on_unrecovered_nmi,
		.maxlen		= sizeof(int),
		.mode		= 0644,
953
		.proc_handler	= proc_dointvec,
954
	},
955 956 957 958 959
	{
		.procname	= "panic_on_io_nmi",
		.data		= &panic_on_io_nmi,
		.maxlen		= sizeof(int),
		.mode		= 0644,
960
		.proc_handler	= proc_dointvec,
961
	},
962 963 964 965 966 967 968 969 970
#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
971 972 973 974 975
	{
		.procname	= "bootloader_type",
		.data		= &bootloader_type,
		.maxlen		= sizeof (int),
		.mode		= 0444,
976
		.proc_handler	= proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
977
	},
978 979 980 981 982
	{
		.procname	= "bootloader_version",
		.data		= &bootloader_version,
		.maxlen		= sizeof (int),
		.mode		= 0444,
983
		.proc_handler	= proc_dointvec,
984
	},
985 986 987 988 989
	{
		.procname	= "kstack_depth_to_print",
		.data		= &kstack_depth_to_print,
		.maxlen		= sizeof(int),
		.mode		= 0644,
990
		.proc_handler	= proc_dointvec,
991
	},
992 993 994 995 996
	{
		.procname	= "io_delay_type",
		.data		= &io_delay_type,
		.maxlen		= sizeof(int),
		.mode		= 0644,
997
		.proc_handler	= proc_dointvec,
998
	},
Linus Torvalds's avatar
Linus Torvalds committed
999
#endif
1000
#if defined(CONFIG_MMU)
Linus Torvalds's avatar
Linus Torvalds committed
1001 1002 1003 1004 1005
	{
		.procname	= "randomize_va_space",
		.data		= &randomize_va_space,
		.maxlen		= sizeof(int),
		.mode		= 0644,
1006
		.proc_handler	= proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
1007
	},
1008
#endif
1009
#if defined(CONFIG_S390) && defined(CONFIG_SMP)
1010 1011 1012 1013 1014
	{
		.procname	= "spin_retry",
		.data		= &spin_retry,
		.maxlen		= sizeof (int),
		.mode		= 0644,
1015
		.proc_handler	= proc_dointvec,
1016
	},
1017
#endif
Len Brown's avatar
Len Brown committed
1018
#if	defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
1019 1020
	{
		.procname	= "acpi_video_flags",
1021
		.data		= &acpi_realmode_flags,
1022 1023
		.maxlen		= sizeof (unsigned long),
		.mode		= 0644,
1024
		.proc_handler	= proc_doulongvec_minmax,
1025
	},
1026
#endif
1027
#ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
1028 1029 1030 1031 1032
	{
		.procname	= "ignore-unaligned-usertrap",
		.