sysctl.c 58.3 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 99 100
#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
101
extern int suid_dumpable;
Linus Torvalds's avatar
Linus Torvalds committed
102
extern char core_pattern[];
103
extern unsigned int core_pipe_limit;
Linus Torvalds's avatar
Linus Torvalds committed
104 105 106
extern int pid_max;
extern int min_free_kbytes;
extern int pid_max_min, pid_max_max;
Andrew Morton's avatar
Andrew Morton committed
107
extern int sysctl_drop_caches;
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
115
#ifdef CONFIG_BLOCK
116
extern int blk_iopoll_enabled;
117
#endif
Linus Torvalds's avatar
Linus Torvalds committed
118

119
/* Constants used for minimum and  maximum */
120
#ifdef CONFIG_LOCKUP_DETECTOR
121
static int sixty = 60;
122
static int neg_one = -1;
123 124 125
#endif

static int zero;
126 127
static int __maybe_unused one = 1;
static int __maybe_unused two = 2;
128
static int __maybe_unused three = 3;
129
static unsigned long one_ul = 1;
130
static int one_hundred = 100;
131 132 133
#ifdef CONFIG_PRINTK
static int ten_thousand = 10000;
#endif
134

135 136 137
/* 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
138 139 140
/* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
static int maxolduid = 65535;
static int minolduid;
141
static int min_percpu_pagelist_fract = 8;
Linus Torvalds's avatar
Linus Torvalds committed
142 143

static int ngroups_max = NGROUPS_MAX;
144
static const int cap_last_cap = CAP_LAST_CAP;
Linus Torvalds's avatar
Linus Torvalds committed
145

Dave Young's avatar
Dave Young committed
146 147 148
#ifdef CONFIG_INOTIFY_USER
#include <linux/inotify.h>
#endif
149
#ifdef CONFIG_SPARC
Linus Torvalds's avatar
Linus Torvalds committed
150 151
#endif

152 153 154 155
#ifdef CONFIG_SPARC64
extern int sysctl_tsb_ratio;
#endif

Linus Torvalds's avatar
Linus Torvalds committed
156 157 158 159 160
#ifdef __hppa__
extern int pwrsw_enabled;
extern int unaligned_enabled;
#endif

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

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

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

178 179 180 181 182
static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
		void __user *buffer, size_t *lenp, loff_t *ppos);
static int proc_dostring_coredump(struct ctl_table *table, int write,
		void __user *buffer, size_t *lenp, loff_t *ppos);

183
#ifdef CONFIG_MAGIC_SYSRQ
184 185
/* Note: sysrq code uses it's own private copy */
static int __sysrq_enabled = SYSRQ_DEFAULT_ENABLE;
186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204

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

205 206 207 208 209 210
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[];
211 212 213
#ifdef CONFIG_EPOLL
extern struct ctl_table epoll_table[];
#endif
Linus Torvalds's avatar
Linus Torvalds committed
214 215 216 217 218 219 220

#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
int sysctl_legacy_va_layout;
#endif

/* The default sysctl tables: */

221
static struct ctl_table sysctl_base_table[] = {
Linus Torvalds's avatar
Linus Torvalds committed
222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246
	{
		.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,
	},
247
	{ }
Linus Torvalds's avatar
Linus Torvalds committed
248 249
};

Ingo Molnar's avatar
Ingo Molnar committed
250
#ifdef CONFIG_SCHED_DEBUG
251 252 253 254
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 */
255 256
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
257 258
#endif

259 260 261 262 263
#ifdef CONFIG_COMPACTION
static int min_extfrag_threshold;
static int max_extfrag_threshold = 1000;
#endif

264
static struct ctl_table kern_table[] = {
265 266 267 268 269
	{
		.procname	= "sched_child_runs_first",
		.data		= &sysctl_sched_child_runs_first,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
270
		.proc_handler	= proc_dointvec,
271
	},
Ingo Molnar's avatar
Ingo Molnar committed
272 273
#ifdef CONFIG_SCHED_DEBUG
	{
274 275
		.procname	= "sched_min_granularity_ns",
		.data		= &sysctl_sched_min_granularity,
Ingo Molnar's avatar
Ingo Molnar committed
276 277
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
278
		.proc_handler	= sched_proc_update_handler,
279 280
		.extra1		= &min_sched_granularity_ns,
		.extra2		= &max_sched_granularity_ns,
Ingo Molnar's avatar
Ingo Molnar committed
281
	},
282 283 284 285 286
	{
		.procname	= "sched_latency_ns",
		.data		= &sysctl_sched_latency,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
287
		.proc_handler	= sched_proc_update_handler,
288 289 290
		.extra1		= &min_sched_granularity_ns,
		.extra2		= &max_sched_granularity_ns,
	},
Ingo Molnar's avatar
Ingo Molnar committed
291 292 293 294 295
	{
		.procname	= "sched_wakeup_granularity_ns",
		.data		= &sysctl_sched_wakeup_granularity,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
296
		.proc_handler	= sched_proc_update_handler,
Ingo Molnar's avatar
Ingo Molnar committed
297 298 299
		.extra1		= &min_wakeup_granularity_ns,
		.extra2		= &max_wakeup_granularity_ns,
	},
300 301 302 303 304
	{
		.procname	= "sched_tunable_scaling",
		.data		= &sysctl_sched_tunable_scaling,
		.maxlen		= sizeof(enum sched_tunable_scaling),
		.mode		= 0644,
305
		.proc_handler	= sched_proc_update_handler,
306 307
		.extra1		= &min_sched_tunable_scaling,
		.extra2		= &max_sched_tunable_scaling,
308
	},
309 310 311 312 313
	{
		.procname	= "sched_migration_cost",
		.data		= &sysctl_sched_migration_cost,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
314
		.proc_handler	= proc_dointvec,
315
	},
316 317 318 319
	{
		.procname	= "sched_nr_migrate",
		.data		= &sysctl_sched_nr_migrate,
		.maxlen		= sizeof(unsigned int),
Peter Zijlstra's avatar
Peter Zijlstra committed
320
		.mode		= 0644,
321
		.proc_handler	= proc_dointvec,
Peter Zijlstra's avatar
Peter Zijlstra committed
322
	},
323 324 325 326 327
	{
		.procname	= "sched_time_avg",
		.data		= &sysctl_sched_time_avg,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
328
		.proc_handler	= proc_dointvec,
329
	},
330 331 332 333 334 335 336
	{
		.procname	= "sched_shares_window",
		.data		= &sysctl_sched_shares_window,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
		.proc_handler	= proc_dointvec,
	},
337 338 339 340 341
	{
		.procname	= "timer_migration",
		.data		= &sysctl_timer_migration,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
342
		.proc_handler	= proc_dointvec_minmax,
343 344
		.extra1		= &zero,
		.extra2		= &one,
Peter Zijlstra's avatar
Peter Zijlstra committed
345
	},
346
#endif
Peter Zijlstra's avatar
Peter Zijlstra committed
347 348 349 350 351
	{
		.procname	= "sched_rt_period_us",
		.data		= &sysctl_sched_rt_period,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
352
		.proc_handler	= sched_rt_handler,
Peter Zijlstra's avatar
Peter Zijlstra committed
353 354 355 356 357 358
	},
	{
		.procname	= "sched_rt_runtime_us",
		.data		= &sysctl_sched_rt_runtime,
		.maxlen		= sizeof(int),
		.mode		= 0644,
359
		.proc_handler	= sched_rt_handler,
Peter Zijlstra's avatar
Peter Zijlstra committed
360
	},
361 362 363 364 365 366
#ifdef CONFIG_SCHED_AUTOGROUP
	{
		.procname	= "sched_autogroup_enabled",
		.data		= &sysctl_sched_autogroup_enabled,
		.maxlen		= sizeof(unsigned int),
		.mode		= 0644,
367
		.proc_handler	= proc_dointvec_minmax,
368 369 370 371
		.extra1		= &zero,
		.extra2		= &one,
	},
#endif
372 373 374 375 376 377 378 379 380 381
#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
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_coredump,
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
	},
	{
		.procname	= "random",
		.mode		= 0555,
		.child		= random_table,
	},
619 620 621 622 623
	{
		.procname	= "usermodehelper",
		.mode		= 0555,
		.child		= usermodehelper_table,
	},
Linus Torvalds's avatar
Linus Torvalds committed
624 625 626 627 628
	{
		.procname	= "overflowuid",
		.data		= &overflowuid,
		.maxlen		= sizeof(int),
		.mode		= 0644,
629
		.proc_handler	= proc_dointvec_minmax,
Linus Torvalds's avatar
Linus Torvalds committed
630 631 632 633 634 635 636 637
		.extra1		= &minolduid,
		.extra2		= &maxolduid,
	},
	{
		.procname	= "overflowgid",
		.data		= &overflowgid,
		.maxlen		= sizeof(int),
		.mode		= 0644,
638
		.proc_handler	= proc_dointvec_minmax,
Linus Torvalds's avatar
Linus Torvalds committed
639 640 641
		.extra1		= &minolduid,
		.extra2		= &maxolduid,
	},
642
#ifdef CONFIG_S390
Linus Torvalds's avatar
Linus Torvalds committed
643 644 645 646 647 648
#ifdef CONFIG_MATHEMU
	{
		.procname	= "ieee_emulation_warnings",
		.data		= &sysctl_ieee_emulation_warnings,
		.maxlen		= sizeof(int),
		.mode		= 0644,
649
		.proc_handler	= proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
650 651 652 653
	},
#endif
	{
		.procname	= "userprocess_debug",
654
		.data		= &show_unhandled_signals,
Linus Torvalds's avatar
Linus Torvalds committed
655 656
		.maxlen		= sizeof(int),
		.mode		= 0644,
657
		.proc_handler	= proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
658 659 660 661 662 663 664
	},
#endif
	{
		.procname	= "pid_max",
		.data		= &pid_max,
		.maxlen		= sizeof (int),
		.mode		= 0644,
665
		.proc_handler	= proc_dointvec_minmax,
Linus Torvalds's avatar
Linus Torvalds committed
666 667 668 669 670 671 672 673
		.extra1		= &pid_max_min,
		.extra2		= &pid_max_max,
	},
	{
		.procname	= "panic_on_oops",
		.data		= &panic_on_oops,
		.maxlen		= sizeof(int),
		.mode		= 0644,
674
		.proc_handler	= proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
675
	},
676 677 678 679 680 681
#if defined CONFIG_PRINTK
	{
		.procname	= "printk",
		.data		= &console_loglevel,
		.maxlen		= 4*sizeof(int),
		.mode		= 0644,
682
		.proc_handler	= proc_dointvec,
683
	},
Linus Torvalds's avatar
Linus Torvalds committed
684 685
	{
		.procname	= "printk_ratelimit",
Dave Young's avatar
Dave Young committed
686
		.data		= &printk_ratelimit_state.interval,
Linus Torvalds's avatar
Linus Torvalds committed
687 688
		.maxlen		= sizeof(int),
		.mode		= 0644,
689
		.proc_handler	= proc_dointvec_jiffies,
Linus Torvalds's avatar
Linus Torvalds committed
690 691 692
	},
	{
		.procname	= "printk_ratelimit_burst",
Dave Young's avatar
Dave Young committed
693
		.data		= &printk_ratelimit_state.burst,
Linus Torvalds's avatar
Linus Torvalds committed
694 695
		.maxlen		= sizeof(int),
		.mode		= 0644,
696
		.proc_handler	= proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
697
	},
698 699 700 701 702
	{
		.procname	= "printk_delay",
		.data		= &printk_delay_msec,
		.maxlen		= sizeof(int),
		.mode		= 0644,
703
		.proc_handler	= proc_dointvec_minmax,
704 705 706
		.extra1		= &zero,
		.extra2		= &ten_thousand,
	},
707 708 709 710 711
	{
		.procname	= "dmesg_restrict",
		.data		= &dmesg_restrict,
		.maxlen		= sizeof(int),
		.mode		= 0644,
712
		.proc_handler	= proc_dointvec_minmax_sysadmin,
713 714 715
		.extra1		= &zero,
		.extra2		= &one,
	},
716 717 718 719 720
	{
		.procname	= "kptr_restrict",
		.data		= &kptr_restrict,
		.maxlen		= sizeof(int),
		.mode		= 0644,
721
		.proc_handler	= proc_dointvec_minmax_sysadmin,
722 723 724
		.extra1		= &zero,
		.extra2		= &two,
	},
725
#endif
Linus Torvalds's avatar
Linus Torvalds committed
726 727 728 729 730
	{
		.procname	= "ngroups_max",
		.data		= &ngroups_max,
		.maxlen		= sizeof (int),
		.mode		= 0444,
731
		.proc_handler	= proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
732
	},
733 734 735 736 737 738 739
	{
		.procname	= "cap_last_cap",
		.data		= (void *)&cap_last_cap,
		.maxlen		= sizeof(int),
		.mode		= 0444,
		.proc_handler	= proc_dointvec,
	},
740
#if defined(CONFIG_LOCKUP_DETECTOR)
741
	{
742 743
		.procname       = "watchdog",
		.data           = &watchdog_enabled,
744 745
		.maxlen         = sizeof (int),
		.mode           = 0644,
746 747 748
		.proc_handler   = proc_dowatchdog,
		.extra1		= &zero,
		.extra2		= &one,
749 750 751
	},
	{
		.procname	= "watchdog_thresh",
752
		.data		= &watchdog_thresh,
753 754
		.maxlen		= sizeof(int),
		.mode		= 0644,
755
		.proc_handler	= proc_dowatchdog,
756 757
		.extra1		= &neg_one,
		.extra2		= &sixty,
758
	},
759 760 761 762 763 764 765 766 767
	{
		.procname	= "softlockup_panic",
		.data		= &softlockup_panic,
		.maxlen		= sizeof(int),
		.mode		= 0644,
		.proc_handler	= proc_dointvec_minmax,
		.extra1		= &zero,
		.extra2		= &one,
	},
768 769 770 771 772
	{
		.procname       = "nmi_watchdog",
		.data           = &watchdog_enabled,
		.maxlen         = sizeof (int),
		.mode           = 0644,
773 774 775
		.proc_handler   = proc_dowatchdog,
		.extra1		= &zero,
		.extra2		= &one,
776 777 778 779 780 781 782 783 784 785
	},
#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,
	},
786
#endif
Linus Torvalds's avatar
Linus Torvalds committed
787
#if defined(CONFIG_X86)
788 789 790 791 792
	{
		.procname	= "panic_on_unrecovered_nmi",
		.data		= &panic_on_unrecovered_nmi,
		.maxlen		= sizeof(int),
		.mode		= 0644,
793
		.proc_handler	= proc_dointvec,
794
	},
795 796 797 798 799
	{
		.procname	= "panic_on_io_nmi",
		.data		= &panic_on_io_nmi,
		.maxlen		= sizeof(int),
		.mode		= 0644,
800
		.proc_handler	= proc_dointvec,
801
	},
802 803 804 805 806 807 808 809 810
#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
811 812 813 814 815
	{
		.procname	= "bootloader_type",
		.data		= &bootloader_type,
		.maxlen		= sizeof (int),
		.mode		= 0444,
816
		.proc_handler	= proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
817
	},
818 819 820 821 822
	{
		.procname	= "bootloader_version",
		.data		= &bootloader_version,
		.maxlen		= sizeof (int),
		.mode		= 0444,
823
		.proc_handler	= proc_dointvec,
824
	},
825 826 827 828 829
	{
		.procname	= "kstack_depth_to_print",
		.data		= &kstack_depth_to_print,
		.maxlen		= sizeof(int),
		.mode		= 0644,
830
		.proc_handler	= proc_dointvec,
831
	},
832 833 834 835 836
	{
		.procname	= "io_delay_type",
		.data		= &io_delay_type,
		.maxlen		= sizeof(int),
		.mode		= 0644,
837
		.proc_handler	= proc_dointvec,
838
	},
Linus Torvalds's avatar
Linus Torvalds committed
839
#endif
840
#if defined(CONFIG_MMU)
Linus Torvalds's avatar
Linus Torvalds committed
841 842 843 844 845
	{
		.procname	= "randomize_va_space",
		.data		= &randomize_va_space,
		.maxlen		= sizeof(int),
		.mode		= 0644,
846
		.proc_handler	= proc_dointvec,
Linus Torvalds's avatar
Linus Torvalds committed
847
	},
848
#endif
849
#if defined(CONFIG_S390) && defined(CONFIG_SMP)
850 851 852 853 854
	{
		.procname	= "spin_retry",
		.data		= &spin_retry,
		.maxlen		= sizeof (int),
		.mode		= 0644,
855
		.proc_handler	= proc_dointvec,
856
	},
857
#endif
Len Brown's avatar
Len Brown committed
858
#if	defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
859 860
	{
		.procname	= "acpi_video_flags",
861
		.data		= &acpi_realmode_flags,
862 863
		.maxlen		= sizeof (unsigned long),
		.mode		= 0644,
864
		.proc_handler	= proc_doulongvec_minmax,
865
	},
866 867 868 869 870 871 872
#endif
#ifdef CONFIG_IA64
	{
		.procname	= "ignore-unaligned-usertrap",
		.data		= &no_unaligned_warning,
		.maxlen		= sizeof (int),
	 	.mode		= 0644,
873
		.proc_handler	= proc_dointvec,
874
	},
875 876 877 878 879
	{
		.procname	= "unaligned-dump-stack",
		.data		= &unaligned_dump_stack,
		.maxlen		= sizeof (int),
		.mode		= 0644,
880
		.proc_handler	= proc_dointvec,
881
	},
882
#endif
883 884 885 886 887 888
#ifdef CONFIG_DETECT_HUNG_TASK
	{
		.procname	= "hung_task_panic",
		.data		= &sysctl_hung_task_panic,
		.maxlen		= sizeof(int),
		.mode		= 0644,
889
		.proc_handler	= proc_dointvec_minmax,
890 891 892
		.extra1		= &zero,
		.extra2		= &one,
	},
893 894 895
	{
		.procname	= "hung_task_check_count",
		.data		= &sysctl_hung_task_check_count,
Ingo Molnar's avatar
Ingo Molnar committed
896
		.maxlen		= sizeof(unsigned long),
897
		.mode		= 0644,
898
		.proc_handler	= proc_doulongvec_minmax,
899 900 901 902
	},
	{
		.procname	= "hung_task_timeout_secs",
		.data		= &sysctl_hung_task_timeout_secs,
Ingo Molnar's avatar
Ingo Molnar committed
903
		.maxlen		= sizeof(unsigned long),
904
		.mode		= 0644,
905
		.proc_handler	= proc_dohung_task_timeout_secs,
906 907 908 909
	},
	{
		.procname	= "hung_task_warnings",
		.data		= &sysctl_hung_task_warnings,
Ingo Molnar's avatar
Ingo Molnar committed
910
		.maxlen		= sizeof(unsigned long),
911
		.mode		= 0644,
912
		.proc_handler	= proc_doulongvec_minmax,
913
	},
914
#endif
915 916 917 918 919 920
#ifdef CONFIG_COMPAT
	{
		.procname	= "compat-log",
		.data		= &compat_log,
		.maxlen		= sizeof (int),
	 	.mode		= 0644,
921
		.proc_handler	= proc_dointvec,
922
	},
923
#endif
Ingo Molnar's avatar
Ingo Molnar committed
924 925 926 927 928 929
#ifdef CONFIG_RT_MUTEXES
	{
		.procname	= "max_lock_depth",
		.data		= &max_lock_depth,
		.maxlen		= sizeof(int),
		.mode		= 0644,
930
		.proc_handler	= proc_dointvec,
Ingo Molnar's avatar
Ingo Molnar committed
931
	},
Kees Cook's avatar
Kees Cook committed
932
#endif
933 934 935 936 937
	{
		.procname	= "poweroff_cmd",
		.data		= &poweroff_cmd,
		.maxlen		= POWEROFF_CMD_PATH_LEN,
		.mode		= 0644,
938
		.proc_handler	= proc_dostring,
939
	},
940 941 942 943 944 945 946
#ifdef CONFIG_KEYS
	{
		.procname	= "keys",
		.mode		= 0555,
		.child		= key_sysctls,
	},
#endif
947 948 949 950 951 952
#ifdef CONFIG_RCU_TORTURE_TEST
	{
		.procname       = "rcutorture_runnable",
		.data           = &rcutorture_runnable,
		.maxlen         = sizeof(int),
		.mode           = 0644,
953
		.proc_handler	= proc_dointvec,
954 955
	},
#endif
956
#ifdef CONFIG_PERF_EVENTS
957 958 959 960 961 962
	/*
	 * 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!
	 */
963
	{
964 965 966
		.procname	= "perf_event_paranoid",
		.data		= &sysctl_perf_event_paranoid,
		.maxlen		= sizeof(sysctl_perf_event_paranoid),
967
		.mode		= 0644,
968
		.proc_handler	= proc_dointvec,
969
	},
970
	{
971 972 973
		.procname	= "perf_event_mlock_kb",
		.data		= &sysctl_perf_event_mlock,
		.maxlen		= sizeof(sysctl_perf_event_mlock),
974
		.mode		= 0644,
975
		.proc_handler	= proc_dointvec,
976
	},
977
	{
978 979 980
		.procname	= "perf_event_max_sample_rate",
		.data		= &sysctl_perf_event_sample_rate,
		.maxlen		= sizeof(sysctl_perf_event_sample_rate),
981
		.mode		= 0644,
982
		.proc_handler	= perf_proc_update_handler,
983
	},
984
#endif
985 986 987 988 989 990
#ifdef CONFIG_KMEMCHECK
	{
		.procname	= "kmemcheck",
		.data		= &kmemcheck_enabled,
		.maxlen		= sizeof(int),
		.mode		= 0644,
991
		.proc_handler	= proc_dointvec,
992 993
	},
#endif
994
#ifdef CONFIG_BLOCK