1/*
   2 * sysctl.c: General linux system control interface
   3 *
   4 * Begun 24 March 1995, Stephen Tweedie
   5 * Added /proc support, Dec 1995
   6 * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
   7 * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
   8 * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
   9 * Dynamic registration fixes, Stephen Tweedie.
  10 * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
  11 * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
  12 *  Horn.
  13 * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
  14 * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
  15 * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
  16 *  Wendling.
  17 * The list_for_each() macro wasn't appropriate for the sysctl loop.
  18 *  Removed it and replaced it with older style, 03/23/00, Bill Wendling
  19 */
  20
  21#include <linux/module.h>
  22#include <linux/mm.h>
  23#include <linux/swap.h>
  24#include <linux/slab.h>
  25#include <linux/sysctl.h>
  26#include <linux/bitmap.h>
  27#include <linux/signal.h>
 
  28#include <linux/printk.h>
  29#include <linux/proc_fs.h>
  30#include <linux/security.h>
  31#include <linux/ctype.h>
  32#include <linux/kmemcheck.h>
 
  33#include <linux/fs.h>
  34#include <linux/init.h>
  35#include <linux/kernel.h>
  36#include <linux/kobject.h>
  37#include <linux/net.h>
  38#include <linux/sysrq.h>
  39#include <linux/highuid.h>
  40#include <linux/writeback.h>
  41#include <linux/ratelimit.h>
  42#include <linux/compaction.h>
  43#include <linux/hugetlb.h>
  44#include <linux/initrd.h>
  45#include <linux/key.h>
  46#include <linux/times.h>
  47#include <linux/limits.h>
  48#include <linux/dcache.h>
  49#include <linux/dnotify.h>
  50#include <linux/syscalls.h>
  51#include <linux/vmstat.h>
  52#include <linux/nfs_fs.h>
  53#include <linux/acpi.h>
  54#include <linux/reboot.h>
  55#include <linux/ftrace.h>
  56#include <linux/perf_event.h>
  57#include <linux/kprobes.h>
  58#include <linux/pipe_fs_i.h>
  59#include <linux/oom.h>
  60#include <linux/kmod.h>
  61#include <linux/capability.h>
  62#include <linux/binfmts.h>
 
 
 
 
  63
  64#include <asm/uaccess.h>
 
 
  65#include <asm/processor.h>
  66
  67#ifdef CONFIG_X86
  68#include <asm/nmi.h>
  69#include <asm/stacktrace.h>
  70#include <asm/io.h>
  71#endif
  72#ifdef CONFIG_SPARC
  73#include <asm/setup.h>
  74#endif
  75#ifdef CONFIG_BSD_PROCESS_ACCT
  76#include <linux/acct.h>
  77#endif
  78#ifdef CONFIG_RT_MUTEXES
  79#include <linux/rtmutex.h>
  80#endif
  81#if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
  82#include <linux/lockdep.h>
  83#endif
  84#ifdef CONFIG_CHR_DEV_SG
  85#include <scsi/sg.h>
  86#endif
  87
  88#ifdef CONFIG_LOCKUP_DETECTOR
  89#include <linux/nmi.h>
  90#endif
  91
 
 
  92
  93#if defined(CONFIG_SYSCTL)
  94
  95/* External variables not in a header file. */
  96extern int sysctl_overcommit_memory;
  97extern int sysctl_overcommit_ratio;
  98extern int max_threads;
  99extern int core_uses_pid;
 100extern int suid_dumpable;
 101extern char core_pattern[];
 102extern unsigned int core_pipe_limit;
 103extern int pid_max;
 104extern int min_free_kbytes;
 105extern int pid_max_min, pid_max_max;
 106extern int sysctl_drop_caches;
 107extern int percpu_pagelist_fraction;
 108extern int compat_log;
 109extern int latencytop_enabled;
 110extern int sysctl_nr_open_min, sysctl_nr_open_max;
 111#ifndef CONFIG_MMU
 112extern int sysctl_nr_trim_pages;
 113#endif
 114#ifdef CONFIG_BLOCK
 115extern int blk_iopoll_enabled;
 116#endif
 117
 118/* Constants used for minimum and  maximum */
 119#ifdef CONFIG_LOCKUP_DETECTOR
 120static int sixty = 60;
 121static int neg_one = -1;
 122#endif
 123
 124static int zero;
 125static int __maybe_unused one = 1;
 126static int __maybe_unused two = 2;
 127static int __maybe_unused three = 3;
 128static unsigned long one_ul = 1;
 129static int one_hundred = 100;
 130#ifdef CONFIG_PRINTK
 131static int ten_thousand = 10000;
 132#endif
 133
 134/* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
 135static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
 136
 137/* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
 138static int maxolduid = 65535;
 139static int minolduid;
 140static int min_percpu_pagelist_fract = 8;
 141
 142static int ngroups_max = NGROUPS_MAX;
 143static const int cap_last_cap = CAP_LAST_CAP;
 144
 145#ifdef CONFIG_INOTIFY_USER
 146#include <linux/inotify.h>
 147#endif
 148#ifdef CONFIG_SPARC
 149#endif
 150
 151#ifdef CONFIG_SPARC64
 152extern int sysctl_tsb_ratio;
 153#endif
 154
 155#ifdef __hppa__
 156extern int pwrsw_enabled;
 157extern int unaligned_enabled;
 158#endif
 159
 160#ifdef CONFIG_IA64
 161extern int no_unaligned_warning;
 162extern int unaligned_dump_stack;
 163#endif
 164
 165#ifdef CONFIG_PROC_SYSCTL
 166static int proc_do_cad_pid(struct ctl_table *table, int write,
 167		  void __user *buffer, size_t *lenp, loff_t *ppos);
 168static int proc_taint(struct ctl_table *table, int write,
 169			       void __user *buffer, size_t *lenp, loff_t *ppos);
 170#endif
 171
 172#ifdef CONFIG_PRINTK
 173static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
 174				void __user *buffer, size_t *lenp, loff_t *ppos);
 175#endif
 176
 177#ifdef CONFIG_MAGIC_SYSRQ
 178/* Note: sysrq code uses it's own private copy */
 179static int __sysrq_enabled = SYSRQ_DEFAULT_ENABLE;
 180
 181static int sysrq_sysctl_handler(ctl_table *table, int write,
 182				void __user *buffer, size_t *lenp,
 183				loff_t *ppos)
 184{
 185	int error;
 186
 187	error = proc_dointvec(table, write, buffer, lenp, ppos);
 188	if (error)
 189		return error;
 190
 191	if (write)
 192		sysrq_toggle_support(__sysrq_enabled);
 193
 194	return 0;
 195}
 196
 197#endif
 198
 199static struct ctl_table kern_table[];
 200static struct ctl_table vm_table[];
 201static struct ctl_table fs_table[];
 202static struct ctl_table debug_table[];
 203static struct ctl_table dev_table[];
 204extern struct ctl_table random_table[];
 205#ifdef CONFIG_EPOLL
 206extern struct ctl_table epoll_table[];
 207#endif
 208
 209#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
 210int sysctl_legacy_va_layout;
 211#endif
 212
 213/* The default sysctl tables: */
 214
 215static struct ctl_table sysctl_base_table[] = {
 216	{
 217		.procname	= "kernel",
 218		.mode		= 0555,
 219		.child		= kern_table,
 220	},
 221	{
 222		.procname	= "vm",
 223		.mode		= 0555,
 224		.child		= vm_table,
 225	},
 226	{
 227		.procname	= "fs",
 228		.mode		= 0555,
 229		.child		= fs_table,
 230	},
 231	{
 232		.procname	= "debug",
 233		.mode		= 0555,
 234		.child		= debug_table,
 235	},
 236	{
 237		.procname	= "dev",
 238		.mode		= 0555,
 239		.child		= dev_table,
 240	},
 241	{ }
 242};
 243
 244#ifdef CONFIG_SCHED_DEBUG
 245static int min_sched_granularity_ns = 100000;		/* 100 usecs */
 246static int max_sched_granularity_ns = NSEC_PER_SEC;	/* 1 second */
 247static int min_wakeup_granularity_ns;			/* 0 usecs */
 248static int max_wakeup_granularity_ns = NSEC_PER_SEC;	/* 1 second */
 249static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
 250static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
 251#endif
 252
 253#ifdef CONFIG_COMPACTION
 254static int min_extfrag_threshold;
 255static int max_extfrag_threshold = 1000;
 256#endif
 257
 258static struct ctl_table kern_table[] = {
 259	{
 260		.procname	= "sched_child_runs_first",
 261		.data		= &sysctl_sched_child_runs_first,
 262		.maxlen		= sizeof(unsigned int),
 263		.mode		= 0644,
 264		.proc_handler	= proc_dointvec,
 265	},
 266#ifdef CONFIG_SCHED_DEBUG
 267	{
 268		.procname	= "sched_min_granularity_ns",
 269		.data		= &sysctl_sched_min_granularity,
 270		.maxlen		= sizeof(unsigned int),
 271		.mode		= 0644,
 272		.proc_handler	= sched_proc_update_handler,
 273		.extra1		= &min_sched_granularity_ns,
 274		.extra2		= &max_sched_granularity_ns,
 275	},
 276	{
 277		.procname	= "sched_latency_ns",
 278		.data		= &sysctl_sched_latency,
 279		.maxlen		= sizeof(unsigned int),
 280		.mode		= 0644,
 281		.proc_handler	= sched_proc_update_handler,
 282		.extra1		= &min_sched_granularity_ns,
 283		.extra2		= &max_sched_granularity_ns,
 284	},
 285	{
 286		.procname	= "sched_wakeup_granularity_ns",
 287		.data		= &sysctl_sched_wakeup_granularity,
 288		.maxlen		= sizeof(unsigned int),
 289		.mode		= 0644,
 290		.proc_handler	= sched_proc_update_handler,
 291		.extra1		= &min_wakeup_granularity_ns,
 292		.extra2		= &max_wakeup_granularity_ns,
 293	},
 294	{
 295		.procname	= "sched_tunable_scaling",
 296		.data		= &sysctl_sched_tunable_scaling,
 297		.maxlen		= sizeof(enum sched_tunable_scaling),
 298		.mode		= 0644,
 299		.proc_handler	= sched_proc_update_handler,
 300		.extra1		= &min_sched_tunable_scaling,
 301		.extra2		= &max_sched_tunable_scaling,
 302	},
 303	{
 304		.procname	= "sched_migration_cost",
 305		.data		= &sysctl_sched_migration_cost,
 306		.maxlen		= sizeof(unsigned int),
 307		.mode		= 0644,
 308		.proc_handler	= proc_dointvec,
 309	},
 310	{
 311		.procname	= "sched_nr_migrate",
 312		.data		= &sysctl_sched_nr_migrate,
 313		.maxlen		= sizeof(unsigned int),
 314		.mode		= 0644,
 315		.proc_handler	= proc_dointvec,
 316	},
 317	{
 318		.procname	= "sched_time_avg",
 319		.data		= &sysctl_sched_time_avg,
 320		.maxlen		= sizeof(unsigned int),
 321		.mode		= 0644,
 322		.proc_handler	= proc_dointvec,
 323	},
 324	{
 325		.procname	= "sched_shares_window",
 326		.data		= &sysctl_sched_shares_window,
 327		.maxlen		= sizeof(unsigned int),
 328		.mode		= 0644,
 329		.proc_handler	= proc_dointvec,
 330	},
 331	{
 332		.procname	= "timer_migration",
 333		.data		= &sysctl_timer_migration,
 334		.maxlen		= sizeof(unsigned int),
 335		.mode		= 0644,
 336		.proc_handler	= proc_dointvec_minmax,
 337		.extra1		= &zero,
 338		.extra2		= &one,
 339	},
 340#endif
 341	{
 342		.procname	= "sched_rt_period_us",
 343		.data		= &sysctl_sched_rt_period,
 344		.maxlen		= sizeof(unsigned int),
 345		.mode		= 0644,
 346		.proc_handler	= sched_rt_handler,
 347	},
 348	{
 349		.procname	= "sched_rt_runtime_us",
 350		.data		= &sysctl_sched_rt_runtime,
 351		.maxlen		= sizeof(int),
 352		.mode		= 0644,
 353		.proc_handler	= sched_rt_handler,
 354	},
 355#ifdef CONFIG_SCHED_AUTOGROUP
 356	{
 357		.procname	= "sched_autogroup_enabled",
 358		.data		= &sysctl_sched_autogroup_enabled,
 359		.maxlen		= sizeof(unsigned int),
 360		.mode		= 0644,
 361		.proc_handler	= proc_dointvec_minmax,
 362		.extra1		= &zero,
 363		.extra2		= &one,
 364	},
 365#endif
 366#ifdef CONFIG_CFS_BANDWIDTH
 367	{
 368		.procname	= "sched_cfs_bandwidth_slice_us",
 369		.data		= &sysctl_sched_cfs_bandwidth_slice,
 370		.maxlen		= sizeof(unsigned int),
 371		.mode		= 0644,
 372		.proc_handler	= proc_dointvec_minmax,
 373		.extra1		= &one,
 374	},
 375#endif
 376#ifdef CONFIG_PROVE_LOCKING
 377	{
 378		.procname	= "prove_locking",
 379		.data		= &prove_locking,
 380		.maxlen		= sizeof(int),
 381		.mode		= 0644,
 382		.proc_handler	= proc_dointvec,
 383	},
 384#endif
 385#ifdef CONFIG_LOCK_STAT
 386	{
 387		.procname	= "lock_stat",
 388		.data		= &lock_stat,
 389		.maxlen		= sizeof(int),
 390		.mode		= 0644,
 391		.proc_handler	= proc_dointvec,
 392	},
 393#endif
 394	{
 395		.procname	= "panic",
 396		.data		= &panic_timeout,
 397		.maxlen		= sizeof(int),
 398		.mode		= 0644,
 399		.proc_handler	= proc_dointvec,
 400	},
 401	{
 402		.procname	= "core_uses_pid",
 403		.data		= &core_uses_pid,
 404		.maxlen		= sizeof(int),
 405		.mode		= 0644,
 406		.proc_handler	= proc_dointvec,
 407	},
 408	{
 409		.procname	= "core_pattern",
 410		.data		= core_pattern,
 411		.maxlen		= CORENAME_MAX_SIZE,
 412		.mode		= 0644,
 413		.proc_handler	= proc_dostring,
 414	},
 415	{
 416		.procname	= "core_pipe_limit",
 417		.data		= &core_pipe_limit,
 418		.maxlen		= sizeof(unsigned int),
 419		.mode		= 0644,
 420		.proc_handler	= proc_dointvec,
 421	},
 422#ifdef CONFIG_PROC_SYSCTL
 423	{
 424		.procname	= "tainted",
 425		.maxlen 	= sizeof(long),
 426		.mode		= 0644,
 427		.proc_handler	= proc_taint,
 428	},
 429#endif
 430#ifdef CONFIG_LATENCYTOP
 431	{
 432		.procname	= "latencytop",
 433		.data		= &latencytop_enabled,
 434		.maxlen		= sizeof(int),
 435		.mode		= 0644,
 436		.proc_handler	= proc_dointvec,
 437	},
 438#endif
 439#ifdef CONFIG_BLK_DEV_INITRD
 440	{
 441		.procname	= "real-root-dev",
 442		.data		= &real_root_dev,
 443		.maxlen		= sizeof(int),
 444		.mode		= 0644,
 445		.proc_handler	= proc_dointvec,
 446	},
 447#endif
 448	{
 449		.procname	= "print-fatal-signals",
 450		.data		= &print_fatal_signals,
 451		.maxlen		= sizeof(int),
 452		.mode		= 0644,
 453		.proc_handler	= proc_dointvec,
 454	},
 455#ifdef CONFIG_SPARC
 456	{
 457		.procname	= "reboot-cmd",
 458		.data		= reboot_command,
 459		.maxlen		= 256,
 460		.mode		= 0644,
 461		.proc_handler	= proc_dostring,
 462	},
 463	{
 464		.procname	= "stop-a",
 465		.data		= &stop_a_enabled,
 466		.maxlen		= sizeof (int),
 467		.mode		= 0644,
 468		.proc_handler	= proc_dointvec,
 469	},
 470	{
 471		.procname	= "scons-poweroff",
 472		.data		= &scons_pwroff,
 473		.maxlen		= sizeof (int),
 474		.mode		= 0644,
 475		.proc_handler	= proc_dointvec,
 476	},
 477#endif
 478#ifdef CONFIG_SPARC64
 479	{
 480		.procname	= "tsb-ratio",
 481		.data		= &sysctl_tsb_ratio,
 482		.maxlen		= sizeof (int),
 483		.mode		= 0644,
 484		.proc_handler	= proc_dointvec,
 485	},
 486#endif
 487#ifdef __hppa__
 488	{
 489		.procname	= "soft-power",
 490		.data		= &pwrsw_enabled,
 491		.maxlen		= sizeof (int),
 492	 	.mode		= 0644,
 493		.proc_handler	= proc_dointvec,
 494	},
 495	{
 496		.procname	= "unaligned-trap",
 497		.data		= &unaligned_enabled,
 498		.maxlen		= sizeof (int),
 499		.mode		= 0644,
 500		.proc_handler	= proc_dointvec,
 501	},
 502#endif
 503	{
 504		.procname	= "ctrl-alt-del",
 505		.data		= &C_A_D,
 506		.maxlen		= sizeof(int),
 507		.mode		= 0644,
 508		.proc_handler	= proc_dointvec,
 509	},
 510#ifdef CONFIG_FUNCTION_TRACER
 511	{
 512		.procname	= "ftrace_enabled",
 513		.data		= &ftrace_enabled,
 514		.maxlen		= sizeof(int),
 515		.mode		= 0644,
 516		.proc_handler	= ftrace_enable_sysctl,
 517	},
 518#endif
 519#ifdef CONFIG_STACK_TRACER
 520	{
 521		.procname	= "stack_tracer_enabled",
 522		.data		= &stack_tracer_enabled,
 523		.maxlen		= sizeof(int),
 524		.mode		= 0644,
 525		.proc_handler	= stack_trace_sysctl,
 526	},
 527#endif
 528#ifdef CONFIG_TRACING
 529	{
 530		.procname	= "ftrace_dump_on_oops",
 531		.data		= &ftrace_dump_on_oops,
 532		.maxlen		= sizeof(int),
 533		.mode		= 0644,
 534		.proc_handler	= proc_dointvec,
 535	},
 536#endif
 537#ifdef CONFIG_MODULES
 538	{
 539		.procname	= "modprobe",
 540		.data		= &modprobe_path,
 541		.maxlen		= KMOD_PATH_LEN,
 542		.mode		= 0644,
 543		.proc_handler	= proc_dostring,
 544	},
 545	{
 546		.procname	= "modules_disabled",
 547		.data		= &modules_disabled,
 548		.maxlen		= sizeof(int),
 549		.mode		= 0644,
 550		/* only handle a transition from default "0" to "1" */
 551		.proc_handler	= proc_dointvec_minmax,
 552		.extra1		= &one,
 553		.extra2		= &one,
 554	},
 555#endif
 556#ifdef CONFIG_HOTPLUG
 557	{
 558		.procname	= "hotplug",
 559		.data		= &uevent_helper,
 560		.maxlen		= UEVENT_HELPER_PATH_LEN,
 561		.mode		= 0644,
 562		.proc_handler	= proc_dostring,
 563	},
 564#endif
 565#ifdef CONFIG_CHR_DEV_SG
 566	{
 567		.procname	= "sg-big-buff",
 568		.data		= &sg_big_buff,
 569		.maxlen		= sizeof (int),
 570		.mode		= 0444,
 571		.proc_handler	= proc_dointvec,
 572	},
 573#endif
 574#ifdef CONFIG_BSD_PROCESS_ACCT
 575	{
 576		.procname	= "acct",
 577		.data		= &acct_parm,
 578		.maxlen		= 3*sizeof(int),
 579		.mode		= 0644,
 580		.proc_handler	= proc_dointvec,
 581	},
 582#endif
 583#ifdef CONFIG_MAGIC_SYSRQ
 584	{
 585		.procname	= "sysrq",
 586		.data		= &__sysrq_enabled,
 587		.maxlen		= sizeof (int),
 588		.mode		= 0644,
 589		.proc_handler	= sysrq_sysctl_handler,
 590	},
 591#endif
 592#ifdef CONFIG_PROC_SYSCTL
 593	{
 594		.procname	= "cad_pid",
 595		.data		= NULL,
 596		.maxlen		= sizeof (int),
 597		.mode		= 0600,
 598		.proc_handler	= proc_do_cad_pid,
 599	},
 600#endif
 601	{
 602		.procname	= "threads-max",
 603		.data		= &max_threads,
 604		.maxlen		= sizeof(int),
 605		.mode		= 0644,
 606		.proc_handler	= proc_dointvec,
 607	},
 608	{
 609		.procname	= "random",
 610		.mode		= 0555,
 611		.child		= random_table,
 612	},
 613	{
 614		.procname	= "usermodehelper",
 615		.mode		= 0555,
 616		.child		= usermodehelper_table,
 617	},
 618	{
 619		.procname	= "overflowuid",
 620		.data		= &overflowuid,
 621		.maxlen		= sizeof(int),
 622		.mode		= 0644,
 623		.proc_handler	= proc_dointvec_minmax,
 624		.extra1		= &minolduid,
 625		.extra2		= &maxolduid,
 626	},
 627	{
 628		.procname	= "overflowgid",
 629		.data		= &overflowgid,
 630		.maxlen		= sizeof(int),
 631		.mode		= 0644,
 632		.proc_handler	= proc_dointvec_minmax,
 633		.extra1		= &minolduid,
 634		.extra2		= &maxolduid,
 635	},
 636#ifdef CONFIG_S390
 637#ifdef CONFIG_MATHEMU
 638	{
 639		.procname	= "ieee_emulation_warnings",
 640		.data		= &sysctl_ieee_emulation_warnings,
 641		.maxlen		= sizeof(int),
 642		.mode		= 0644,
 643		.proc_handler	= proc_dointvec,
 644	},
 645#endif
 646	{
 647		.procname	= "userprocess_debug",
 648		.data		= &show_unhandled_signals,
 649		.maxlen		= sizeof(int),
 650		.mode		= 0644,
 651		.proc_handler	= proc_dointvec,
 652	},
 653#endif
 654	{
 655		.procname	= "pid_max",
 656		.data		= &pid_max,
 657		.maxlen		= sizeof (int),
 658		.mode		= 0644,
 659		.proc_handler	= proc_dointvec_minmax,
 660		.extra1		= &pid_max_min,
 661		.extra2		= &pid_max_max,
 662	},
 663	{
 664		.procname	= "panic_on_oops",
 665		.data		= &panic_on_oops,
 666		.maxlen		= sizeof(int),
 667		.mode		= 0644,
 668		.proc_handler	= proc_dointvec,
 669	},
 670#if defined CONFIG_PRINTK
 671	{
 672		.procname	= "printk",
 673		.data		= &console_loglevel,
 674		.maxlen		= 4*sizeof(int),
 675		.mode		= 0644,
 676		.proc_handler	= proc_dointvec,
 677	},
 678	{
 679		.procname	= "printk_ratelimit",
 680		.data		= &printk_ratelimit_state.interval,
 681		.maxlen		= sizeof(int),
 682		.mode		= 0644,
 683		.proc_handler	= proc_dointvec_jiffies,
 684	},
 685	{
 686		.procname	= "printk_ratelimit_burst",
 687		.data		= &printk_ratelimit_state.burst,
 688		.maxlen		= sizeof(int),
 689		.mode		= 0644,
 690		.proc_handler	= proc_dointvec,
 691	},
 692	{
 693		.procname	= "printk_delay",
 694		.data		= &printk_delay_msec,
 695		.maxlen		= sizeof(int),
 696		.mode		= 0644,
 697		.proc_handler	= proc_dointvec_minmax,
 698		.extra1		= &zero,
 699		.extra2		= &ten_thousand,
 700	},
 701	{
 702		.procname	= "dmesg_restrict",
 703		.data		= &dmesg_restrict,
 704		.maxlen		= sizeof(int),
 705		.mode		= 0644,
 706		.proc_handler	= proc_dointvec_minmax_sysadmin,
 707		.extra1		= &zero,
 708		.extra2		= &one,
 709	},
 710	{
 711		.procname	= "kptr_restrict",
 712		.data		= &kptr_restrict,
 713		.maxlen		= sizeof(int),
 714		.mode		= 0644,
 715		.proc_handler	= proc_dointvec_minmax_sysadmin,
 716		.extra1		= &zero,
 717		.extra2		= &two,
 718	},
 719#endif
 720	{
 721		.procname	= "ngroups_max",
 722		.data		= &ngroups_max,
 723		.maxlen		= sizeof (int),
 724		.mode		= 0444,
 725		.proc_handler	= proc_dointvec,
 726	},
 727	{
 728		.procname	= "cap_last_cap",
 729		.data		= (void *)&cap_last_cap,
 730		.maxlen		= sizeof(int),
 731		.mode		= 0444,
 732		.proc_handler	= proc_dointvec,
 733	},
 734#if defined(CONFIG_LOCKUP_DETECTOR)
 735	{
 736		.procname       = "watchdog",
 737		.data           = &watchdog_enabled,
 738		.maxlen         = sizeof (int),
 739		.mode           = 0644,
 740		.proc_handler   = proc_dowatchdog,
 741		.extra1		= &zero,
 742		.extra2		= &one,
 743	},
 744	{
 745		.procname	= "watchdog_thresh",
 746		.data		= &watchdog_thresh,
 747		.maxlen		= sizeof(int),
 748		.mode		= 0644,
 749		.proc_handler	= proc_dowatchdog,
 750		.extra1		= &neg_one,
 751		.extra2		= &sixty,
 752	},
 753	{
 754		.procname	= "softlockup_panic",
 755		.data		= &softlockup_panic,
 756		.maxlen		= sizeof(int),
 757		.mode		= 0644,
 758		.proc_handler	= proc_dointvec_minmax,
 759		.extra1		= &zero,
 760		.extra2		= &one,
 761	},
 762	{
 763		.procname       = "nmi_watchdog",
 764		.data           = &watchdog_enabled,
 765		.maxlen         = sizeof (int),
 766		.mode           = 0644,
 767		.proc_handler   = proc_dowatchdog,
 768		.extra1		= &zero,
 769		.extra2		= &one,
 770	},
 771#endif
 772#if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
 773	{
 774		.procname       = "unknown_nmi_panic",
 775		.data           = &unknown_nmi_panic,
 776		.maxlen         = sizeof (int),
 777		.mode           = 0644,
 778		.proc_handler   = proc_dointvec,
 779	},
 780#endif
 781#if defined(CONFIG_X86)
 782	{
 783		.procname	= "panic_on_unrecovered_nmi",
 784		.data		= &panic_on_unrecovered_nmi,
 785		.maxlen		= sizeof(int),
 786		.mode		= 0644,
 787		.proc_handler	= proc_dointvec,
 788	},
 789	{
 790		.procname	= "panic_on_io_nmi",
 791		.data		= &panic_on_io_nmi,
 792		.maxlen		= sizeof(int),
 793		.mode		= 0644,
 794		.proc_handler	= proc_dointvec,
 795	},
 796#ifdef CONFIG_DEBUG_STACKOVERFLOW
 797	{
 798		.procname	= "panic_on_stackoverflow",
 799		.data		= &sysctl_panic_on_stackoverflow,
 800		.maxlen		= sizeof(int),
 801		.mode		= 0644,
 802		.proc_handler	= proc_dointvec,
 803	},
 804#endif
 805	{
 806		.procname	= "bootloader_type",
 807		.data		= &bootloader_type,
 808		.maxlen		= sizeof (int),
 809		.mode		= 0444,
 810		.proc_handler	= proc_dointvec,
 811	},
 812	{
 813		.procname	= "bootloader_version",
 814		.data		= &bootloader_version,
 815		.maxlen		= sizeof (int),
 816		.mode		= 0444,
 817		.proc_handler	= proc_dointvec,
 818	},
 819	{
 820		.procname	= "kstack_depth_to_print",
 821		.data		= &kstack_depth_to_print,
 822		.maxlen		= sizeof(int),
 823		.mode		= 0644,
 824		.proc_handler	= proc_dointvec,
 825	},
 826	{
 827		.procname	= "io_delay_type",
 828		.data		= &io_delay_type,
 829		.maxlen		= sizeof(int),
 830		.mode		= 0644,
 831		.proc_handler	= proc_dointvec,
 832	},
 833#endif
 834#if defined(CONFIG_MMU)
 835	{
 836		.procname	= "randomize_va_space",
 837		.data		= &randomize_va_space,
 838		.maxlen		= sizeof(int),
 839		.mode		= 0644,
 840		.proc_handler	= proc_dointvec,
 841	},
 842#endif
 843#if defined(CONFIG_S390) && defined(CONFIG_SMP)
 844	{
 845		.procname	= "spin_retry",
 846		.data		= &spin_retry,
 847		.maxlen		= sizeof (int),
 848		.mode		= 0644,
 849		.proc_handler	= proc_dointvec,
 850	},
 851#endif
 852#if	defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
 853	{
 854		.procname	= "acpi_video_flags",
 855		.data		= &acpi_realmode_flags,
 856		.maxlen		= sizeof (unsigned long),
 857		.mode		= 0644,
 858		.proc_handler	= proc_doulongvec_minmax,
 859	},
 860#endif
 861#ifdef CONFIG_IA64
 862	{
 863		.procname	= "ignore-unaligned-usertrap",
 864		.data		= &no_unaligned_warning,
 865		.maxlen		= sizeof (int),
 866	 	.mode		= 0644,
 867		.proc_handler	= proc_dointvec,
 868	},
 869	{
 870		.procname	= "unaligned-dump-stack",
 871		.data		= &unaligned_dump_stack,
 872		.maxlen		= sizeof (int),
 873		.mode		= 0644,
 874		.proc_handler	= proc_dointvec,
 875	},
 876#endif
 877#ifdef CONFIG_DETECT_HUNG_TASK
 878	{
 879		.procname	= "hung_task_panic",
 880		.data		= &sysctl_hung_task_panic,
 881		.maxlen		= sizeof(int),
 882		.mode		= 0644,
 883		.proc_handler	= proc_dointvec_minmax,
 884		.extra1		= &zero,
 885		.extra2		= &one,
 886	},
 887	{
 888		.procname	= "hung_task_check_count",
 889		.data		= &sysctl_hung_task_check_count,
 890		.maxlen		= sizeof(unsigned long),
 891		.mode		= 0644,
 892		.proc_handler	= proc_doulongvec_minmax,
 893	},
 894	{
 895		.procname	= "hung_task_timeout_secs",
 896		.data		= &sysctl_hung_task_timeout_secs,
 897		.maxlen		= sizeof(unsigned long),
 898		.mode		= 0644,
 899		.proc_handler	= proc_dohung_task_timeout_secs,
 900	},
 901	{
 902		.procname	= "hung_task_warnings",
 903		.data		= &sysctl_hung_task_warnings,
 904		.maxlen		= sizeof(unsigned long),
 905		.mode		= 0644,
 906		.proc_handler	= proc_doulongvec_minmax,
 907	},
 908#endif
 909#ifdef CONFIG_COMPAT
 910	{
 911		.procname	= "compat-log",
 912		.data		= &compat_log,
 913		.maxlen		= sizeof (int),
 914	 	.mode		= 0644,
 915		.proc_handler	= proc_dointvec,
 916	},
 917#endif
 918#ifdef CONFIG_RT_MUTEXES
 919	{
 920		.procname	= "max_lock_depth",
 921		.data		= &max_lock_depth,
 922		.maxlen		= sizeof(int),
 923		.mode		= 0644,
 924		.proc_handler	= proc_dointvec,
 925	},
 926#endif
 927	{
 928		.procname	= "poweroff_cmd",
 929		.data		= &poweroff_cmd,
 930		.maxlen		= POWEROFF_CMD_PATH_LEN,
 931		.mode		= 0644,
 932		.proc_handler	= proc_dostring,
 933	},
 934#ifdef CONFIG_KEYS
 935	{
 936		.procname	= "keys",
 937		.mode		= 0555,
 938		.child		= key_sysctls,
 939	},
 940#endif
 941#ifdef CONFIG_RCU_TORTURE_TEST
 942	{
 943		.procname       = "rcutorture_runnable",
 944		.data           = &rcutorture_runnable,
 945		.maxlen         = sizeof(int),
 946		.mode           = 0644,
 947		.proc_handler	= proc_dointvec,
 948	},
 949#endif
 950#ifdef CONFIG_PERF_EVENTS
 951	/*
 952	 * User-space scripts rely on the existence of this file
 953	 * as a feature check for perf_events being enabled.
 954	 *
 955	 * So it's an ABI, do not remove!
 956	 */
 957	{
 958		.procname	= "perf_event_paranoid",
 959		.data		= &sysctl_perf_event_paranoid,
 960		.maxlen		= sizeof(sysctl_perf_event_paranoid),
 961		.mode		= 0644,
 962		.proc_handler	= proc_dointvec,
 963	},
 964	{
 965		.procname	= "perf_event_mlock_kb",
 966		.data		= &sysctl_perf_event_mlock,
 967		.maxlen		= sizeof(sysctl_perf_event_mlock),
 968		.mode		= 0644,
 969		.proc_handler	= proc_dointvec,
 970	},
 971	{
 972		.procname	= "perf_event_max_sample_rate",
 973		.data		= &sysctl_perf_event_sample_rate,
 974		.maxlen		= sizeof(sysctl_perf_event_sample_rate),
 975		.mode		= 0644,
 976		.proc_handler	= perf_proc_update_handler,
 977	},
 978#endif
 979#ifdef CONFIG_KMEMCHECK
 980	{
 981		.procname	= "kmemcheck",
 982		.data		= &kmemcheck_enabled,
 983		.maxlen		= sizeof(int),
 984		.mode		= 0644,
 985		.proc_handler	= proc_dointvec,
 986	},
 987#endif
 988#ifdef CONFIG_BLOCK
 989	{
 990		.procname	= "blk_iopoll",
 991		.data		= &blk_iopoll_enabled,
 992		.maxlen		= sizeof(int),
 993		.mode		= 0644,
 994		.proc_handler	= proc_dointvec,
 995	},
 996#endif
 997	{ }
 998};
 999
1000static struct ctl_table vm_table[] = {
1001	{
1002		.procname	= "overcommit_memory",
1003		.data		= &sysctl_overcommit_memory,
1004		.maxlen		= sizeof(sysctl_overcommit_memory),
1005		.mode		= 0644,
1006		.proc_handler	= proc_dointvec_minmax,
1007		.extra1		= &zero,
1008		.extra2		= &two,
1009	},
1010	{
1011		.procname	= "panic_on_oom",
1012		.data		= &sysctl_panic_on_oom,
1013		.maxlen		= sizeof(sysctl_panic_on_oom),
1014		.mode		= 0644,
1015		.proc_handler	= proc_dointvec_minmax,
1016		.extra1		= &zero,
1017		.extra2		= &two,
1018	},
1019	{
1020		.procname	= "oom_kill_allocating_task",
1021		.data		= &sysctl_oom_kill_allocating_task,
1022		.maxlen		= sizeof(sysctl_oom_kill_allocating_task),
1023		.mode		= 0644,
1024		.proc_handler	= proc_dointvec,
1025	},
1026	{
1027		.procname	= "oom_dump_tasks",
1028		.data		= &sysctl_oom_dump_tasks,
1029		.maxlen		= sizeof(sysctl_oom_dump_tasks),
1030		.mode		= 0644,
1031		.proc_handler	= proc_dointvec,
1032	},
1033	{
1034		.procname	= "overcommit_ratio",
1035		.data		= &sysctl_overcommit_ratio,
1036		.maxlen		= sizeof(sysctl_overcommit_ratio),
1037		.mode		= 0644,
1038		.proc_handler	= proc_dointvec,
1039	},
1040	{
1041		.procname	= "page-cluster", 
1042		.data		= &page_cluster,
1043		.maxlen		= sizeof(int),
1044		.mode		= 0644,
1045		.proc_handler	= proc_dointvec_minmax,
1046		.extra1		= &zero,
1047	},
1048	{
1049		.procname	= "dirty_background_ratio",
1050		.data		= &dirty_background_ratio,
1051		.maxlen		= sizeof(dirty_background_ratio),
1052		.mode		= 0644,
1053		.proc_handler	= dirty_background_ratio_handler,
1054		.extra1		= &zero,
1055		.extra2		= &one_hundred,
1056	},
1057	{
1058		.procname	= "dirty_background_bytes",
1059		.data		= &dirty_background_bytes,
1060		.maxlen		= sizeof(dirty_background_bytes),
1061		.mode		= 0644,
1062		.proc_handler	= dirty_background_bytes_handler,
1063		.extra1		= &one_ul,
1064	},
1065	{
1066		.procname	= "dirty_ratio",
1067		.data		= &vm_dirty_ratio,
1068		.maxlen		= sizeof(vm_dirty_ratio),
1069		.mode		= 0644,
1070		.proc_handler	= dirty_ratio_handler,
1071		.extra1		= &zero,
1072		.extra2		= &one_hundred,
1073	},
1074	{
1075		.procname	= "dirty_bytes",
1076		.data		= &vm_dirty_bytes,
1077		.maxlen		= sizeof(vm_dirty_bytes),
1078		.mode		= 0644,
1079		.proc_handler	= dirty_bytes_handler,
1080		.extra1		= &dirty_bytes_min,
1081	},
1082	{
1083		.procname	= "dirty_writeback_centisecs",
1084		.data		= &dirty_writeback_interval,
1085		.maxlen		= sizeof(dirty_writeback_interval),
1086		.mode		= 0644,
1087		.proc_handler	= dirty_writeback_centisecs_handler,
1088	},
1089	{
1090		.procname	= "dirty_expire_centisecs",
1091		.data		= &dirty_expire_interval,
1092		.maxlen		= sizeof(dirty_expire_interval),
1093		.mode		= 0644,
1094		.proc_handler	= proc_dointvec_minmax,
1095		.extra1		= &zero,
1096	},
1097	{
1098		.procname	= "nr_pdflush_threads",
1099		.data		= &nr_pdflush_threads,
1100		.maxlen		= sizeof nr_pdflush_threads,
1101		.mode		= 0444 /* read-only*/,
1102		.proc_handler	= proc_dointvec,
1103	},
1104	{
1105		.procname	= "swappiness",
1106		.data		= &vm_swappiness,
1107		.maxlen		= sizeof(vm_swappiness),
1108		.mode		= 0644,
1109		.proc_handler	= proc_dointvec_minmax,
1110		.extra1		= &zero,
1111		.extra2		= &one_hundred,
1112	},
1113#ifdef CONFIG_HUGETLB_PAGE
1114	{
1115		.procname	= "nr_hugepages",
1116		.data		= NULL,
1117		.maxlen		= sizeof(unsigned long),
1118		.mode		= 0644,
1119		.proc_handler	= hugetlb_sysctl_handler,
1120		.extra1		= (void *)&hugetlb_zero,
1121		.extra2		= (void *)&hugetlb_infinity,
1122	},
1123#ifdef CONFIG_NUMA
1124	{
1125		.procname       = "nr_hugepages_mempolicy",
1126		.data           = NULL,
1127		.maxlen         = sizeof(unsigned long),
1128		.mode           = 0644,
1129		.proc_handler   = &hugetlb_mempolicy_sysctl_handler,
1130		.extra1		= (void *)&hugetlb_zero,
1131		.extra2		= (void *)&hugetlb_infinity,
1132	},
1133#endif
1134	 {
1135		.procname	= "hugetlb_shm_group",
1136		.data		= &sysctl_hugetlb_shm_group,
1137		.maxlen		= sizeof(gid_t),
1138		.mode		= 0644,
1139		.proc_handler	= proc_dointvec,
1140	 },
1141	 {
1142		.procname	= "hugepages_treat_as_movable",
1143		.data		= &hugepages_treat_as_movable,
1144		.maxlen		= sizeof(int),
1145		.mode		= 0644,
1146		.proc_handler	= hugetlb_treat_movable_handler,
1147	},
1148	{
1149		.procname	= "nr_overcommit_hugepages",
1150		.data		= NULL,
1151		.maxlen		= sizeof(unsigned long),
1152		.mode		= 0644,
1153		.proc_handler	= hugetlb_overcommit_handler,
1154		.extra1		= (void *)&hugetlb_zero,
1155		.extra2		= (void *)&hugetlb_infinity,
1156	},
1157#endif
1158	{
1159		.procname	= "lowmem_reserve_ratio",
1160		.data		= &sysctl_lowmem_reserve_ratio,
1161		.maxlen		= sizeof(sysctl_lowmem_reserve_ratio),
1162		.mode		= 0644,
1163		.proc_handler	= lowmem_reserve_ratio_sysctl_handler,
1164	},
1165	{
1166		.procname	= "drop_caches",
1167		.data		= &sysctl_drop_caches,
1168		.maxlen		= sizeof(int),
1169		.mode		= 0644,
1170		.proc_handler	= drop_caches_sysctl_handler,
1171		.extra1		= &one,
1172		.extra2		= &three,
1173	},
1174#ifdef CONFIG_COMPACTION
1175	{
1176		.procname	= "compact_memory",
1177		.data		= &sysctl_compact_memory,
1178		.maxlen		= sizeof(int),
1179		.mode		= 0200,
1180		.proc_handler	= sysctl_compaction_handler,
1181	},
1182	{
1183		.procname	= "extfrag_threshold",
1184		.data		= &sysctl_extfrag_threshold,
1185		.maxlen		= sizeof(int),
1186		.mode		= 0644,
1187		.proc_handler	= sysctl_extfrag_handler,
1188		.extra1		= &min_extfrag_threshold,
1189		.extra2		= &max_extfrag_threshold,
1190	},
1191
1192#endif /* CONFIG_COMPACTION */
1193	{
1194		.procname	= "min_free_kbytes",
1195		.data		= &min_free_kbytes,
1196		.maxlen		= sizeof(min_free_kbytes),
1197		.mode		= 0644,
1198		.proc_handler	= min_free_kbytes_sysctl_handler,
1199		.extra1		= &zero,
1200	},
1201	{
1202		.procname	= "percpu_pagelist_fraction",
1203		.data		= &percpu_pagelist_fraction,
1204		.maxlen		= sizeof(percpu_pagelist_fraction),
1205		.mode		= 0644,
1206		.proc_handler	= percpu_pagelist_fraction_sysctl_handler,
1207		.extra1		= &min_percpu_pagelist_fract,
1208	},
1209#ifdef CONFIG_MMU
1210	{
1211		.procname	= "max_map_count",
1212		.data		= &sysctl_max_map_count,
1213		.maxlen		= sizeof(sysctl_max_map_count),
1214		.mode		= 0644,
1215		.proc_handler	= proc_dointvec_minmax,
1216		.extra1		= &zero,
1217	},
1218#else
1219	{
1220		.procname	= "nr_trim_pages",
1221		.data		= &sysctl_nr_trim_pages,
1222		.maxlen		= sizeof(sysctl_nr_trim_pages),
1223		.mode		= 0644,
1224		.proc_handler	= proc_dointvec_minmax,
1225		.extra1		= &zero,
1226	},
1227#endif
1228	{
1229		.procname	= "laptop_mode",
1230		.data		= &laptop_mode,
1231		.maxlen		= sizeof(laptop_mode),
1232		.mode		= 0644,
1233		.proc_handler	= proc_dointvec_jiffies,
1234	},
1235	{
1236		.procname	= "block_dump",
1237		.data		= &block_dump,
1238		.maxlen		= sizeof(block_dump),
1239		.mode		= 0644,
1240		.proc_handler	= proc_dointvec,
1241		.extra1		= &zero,
1242	},
1243	{
1244		.procname	= "vfs_cache_pressure",
1245		.data		= &sysctl_vfs_cache_pressure,
1246		.maxlen		= sizeof(sysctl_vfs_cache_pressure),
1247		.mode		= 0644,
1248		.proc_handler	= proc_dointvec,
1249		.extra1		= &zero,
1250	},
1251#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1252	{
1253		.procname	= "legacy_va_layout",
1254		.data		= &sysctl_legacy_va_layout,
1255		.maxlen		= sizeof(sysctl_legacy_va_layout),
1256		.mode		= 0644,
1257		.proc_handler	= proc_dointvec,
1258		.extra1		= &zero,
1259	},
1260#endif
1261#ifdef CONFIG_NUMA
1262	{
1263		.procname	= "zone_reclaim_mode",
1264		.data		= &zone_reclaim_mode,
1265		.maxlen		= sizeof(zone_reclaim_mode),
1266		.mode		= 0644,
1267		.proc_handler	= proc_dointvec,
1268		.extra1		= &zero,
1269	},
1270	{
1271		.procname	= "min_unmapped_ratio",
1272		.data		= &sysctl_min_unmapped_ratio,
1273		.maxlen		= sizeof(sysctl_min_unmapped_ratio),
1274		.mode		= 0644,
1275		.proc_handler	= sysctl_min_unmapped_ratio_sysctl_handler,
1276		.extra1		= &zero,
1277		.extra2		= &one_hundred,
1278	},
1279	{
1280		.procname	= "min_slab_ratio",
1281		.data		= &sysctl_min_slab_ratio,
1282		.maxlen		= sizeof(sysctl_min_slab_ratio),
1283		.mode		= 0644,
1284		.proc_handler	= sysctl_min_slab_ratio_sysctl_handler,
1285		.extra1		= &zero,
1286		.extra2		= &one_hundred,
1287	},
1288#endif
1289#ifdef CONFIG_SMP
1290	{
1291		.procname	= "stat_interval",
1292		.data		= &sysctl_stat_interval,
1293		.maxlen		= sizeof(sysctl_stat_interval),
1294		.mode		= 0644,
1295		.proc_handler	= proc_dointvec_jiffies,
1296	},
1297#endif
1298#ifdef CONFIG_MMU
1299	{
1300		.procname	= "mmap_min_addr",
1301		.data		= &dac_mmap_min_addr,
1302		.maxlen		= sizeof(unsigned long),
1303		.mode		= 0644,
1304		.proc_handler	= mmap_min_addr_handler,
1305	},
1306#endif
1307#ifdef CONFIG_NUMA
1308	{
1309		.procname	= "numa_zonelist_order",
1310		.data		= &numa_zonelist_order,
1311		.maxlen		= NUMA_ZONELIST_ORDER_LEN,
1312		.mode		= 0644,
1313		.proc_handler	= numa_zonelist_order_handler,
1314	},
1315#endif
1316#if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1317   (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1318	{
1319		.procname	= "vdso_enabled",
1320		.data		= &vdso_enabled,
1321		.maxlen		= sizeof(vdso_enabled),
1322		.mode		= 0644,
1323		.proc_handler	= proc_dointvec,
1324		.extra1		= &zero,
1325	},
1326#endif
1327#ifdef CONFIG_HIGHMEM
1328	{
1329		.procname	= "highmem_is_dirtyable",
1330		.data		= &vm_highmem_is_dirtyable,
1331		.maxlen		= sizeof(vm_highmem_is_dirtyable),
1332		.mode		= 0644,
1333		.proc_handler	= proc_dointvec_minmax,
1334		.extra1		= &zero,
1335		.extra2		= &one,
1336	},
1337#endif
1338	{
1339		.procname	= "scan_unevictable_pages",
1340		.data		= &scan_unevictable_pages,
1341		.maxlen		= sizeof(scan_unevictable_pages),
1342		.mode		= 0644,
1343		.proc_handler	= scan_unevictable_handler,
1344	},
1345#ifdef CONFIG_MEMORY_FAILURE
1346	{
1347		.procname	= "memory_failure_early_kill",
1348		.data		= &sysctl_memory_failure_early_kill,
1349		.maxlen		= sizeof(sysctl_memory_failure_early_kill),
1350		.mode		= 0644,
1351		.proc_handler	= proc_dointvec_minmax,
1352		.extra1		= &zero,
1353		.extra2		= &one,
1354	},
1355	{
1356		.procname	= "memory_failure_recovery",
1357		.data		= &sysctl_memory_failure_recovery,
1358		.maxlen		= sizeof(sysctl_memory_failure_recovery),
1359		.mode		= 0644,
1360		.proc_handler	= proc_dointvec_minmax,
1361		.extra1		= &zero,
1362		.extra2		= &one,
1363	},
1364#endif
1365	{ }
1366};
1367
1368#if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1369static struct ctl_table binfmt_misc_table[] = {
1370	{ }
1371};
1372#endif
1373
1374static struct ctl_table fs_table[] = {
1375	{
1376		.procname	= "inode-nr",
1377		.data		= &inodes_stat,
1378		.maxlen		= 2*sizeof(int),
1379		.mode		= 0444,
1380		.proc_handler	= proc_nr_inodes,
1381	},
1382	{
1383		.procname	= "inode-state",
1384		.data		= &inodes_stat,
1385		.maxlen		= 7*sizeof(int),
1386		.mode		= 0444,
1387		.proc_handler	= proc_nr_inodes,
1388	},
1389	{
1390		.procname	= "file-nr",
1391		.data		= &files_stat,
1392		.maxlen		= sizeof(files_stat),
1393		.mode		= 0444,
1394		.proc_handler	= proc_nr_files,
1395	},
1396	{
1397		.procname	= "file-max",
1398		.data		= &files_stat.max_files,
1399		.maxlen		= sizeof(files_stat.max_files),
1400		.mode		= 0644,
1401		.proc_handler	= proc_doulongvec_minmax,
1402	},
1403	{
1404		.procname	= "nr_open",
1405		.data		= &sysctl_nr_open,
1406		.maxlen		= sizeof(int),
1407		.mode		= 0644,
1408		.proc_handler	= proc_dointvec_minmax,
1409		.extra1		= &sysctl_nr_open_min,
1410		.extra2		= &sysctl_nr_open_max,
1411	},
1412	{
1413		.procname	= "dentry-state",
1414		.data		= &dentry_stat,
1415		.maxlen		= 6*sizeof(int),
1416		.mode		= 0444,
1417		.proc_handler	= proc_nr_dentry,
1418	},
1419	{
1420		.procname	= "overflowuid",
1421		.data		= &fs_overflowuid,
1422		.maxlen		= sizeof(int),
1423		.mode		= 0644,
1424		.proc_handler	= proc_dointvec_minmax,
1425		.extra1		= &minolduid,
1426		.extra2		= &maxolduid,
1427	},
1428	{
1429		.procname	= "overflowgid",
1430		.data		= &fs_overflowgid,
1431		.maxlen		= sizeof(int),
1432		.mode		= 0644,
1433		.proc_handler	= proc_dointvec_minmax,
1434		.extra1		= &minolduid,
1435		.extra2		= &maxolduid,
1436	},
1437#ifdef CONFIG_FILE_LOCKING
1438	{
1439		.procname	= "leases-enable",
1440		.data		= &leases_enable,
1441		.maxlen		= sizeof(int),
1442		.mode		= 0644,
1443		.proc_handler	= proc_dointvec,
1444	},
1445#endif
1446#ifdef CONFIG_DNOTIFY
1447	{
1448		.procname	= "dir-notify-enable",
1449		.data		= &dir_notify_enable,
1450		.maxlen		= sizeof(int),
1451		.mode		= 0644,
1452		.proc_handler	= proc_dointvec,
1453	},
1454#endif
1455#ifdef CONFIG_MMU
1456#ifdef CONFIG_FILE_LOCKING
1457	{
1458		.procname	= "lease-break-time",
1459		.data		= &lease_break_time,
1460		.maxlen		= sizeof(int),
1461		.mode		= 0644,
1462		.proc_handler	= proc_dointvec,
1463	},
1464#endif
1465#ifdef CONFIG_AIO
1466	{
1467		.procname	= "aio-nr",
1468		.data		= &aio_nr,
1469		.maxlen		= sizeof(aio_nr),
1470		.mode		= 0444,
1471		.proc_handler	= proc_doulongvec_minmax,
1472	},
1473	{
1474		.procname	= "aio-max-nr",
1475		.data		= &aio_max_nr,
1476		.maxlen		= sizeof(aio_max_nr),
1477		.mode		= 0644,
1478		.proc_handler	= proc_doulongvec_minmax,
1479	},
1480#endif /* CONFIG_AIO */
1481#ifdef CONFIG_INOTIFY_USER
1482	{
1483		.procname	= "inotify",
1484		.mode		= 0555,
1485		.child		= inotify_table,
1486	},
1487#endif	
1488#ifdef CONFIG_EPOLL
1489	{
1490		.procname	= "epoll",
1491		.mode		= 0555,
1492		.child		= epoll_table,
1493	},
1494#endif
1495#endif
1496	{
1497		.procname	= "suid_dumpable",
1498		.data		= &suid_dumpable,
1499		.maxlen		= sizeof(int),
1500		.mode		= 0644,
1501		.proc_handler	= proc_dointvec_minmax,
1502		.extra1		= &zero,
1503		.extra2		= &two,
1504	},
1505#if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1506	{
1507		.procname	= "binfmt_misc",
1508		.mode		= 0555,
1509		.child		= binfmt_misc_table,
1510	},
1511#endif
1512	{
1513		.procname	= "pipe-max-size",
1514		.data		= &pipe_max_size,
1515		.maxlen		= sizeof(int),
1516		.mode		= 0644,
1517		.proc_handler	= &pipe_proc_fn,
1518		.extra1		= &pipe_min_size,
1519	},
1520	{ }
1521};
1522
1523static struct ctl_table debug_table[] = {
1524#if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_SPARC) || \
1525    defined(CONFIG_S390) || defined(CONFIG_TILE)
1526	{
1527		.procname	= "exception-trace",
1528		.data		= &show_unhandled_signals,
1529		.maxlen		= sizeof(int),
1530		.mode		= 0644,
1531		.proc_handler	= proc_dointvec
1532	},
1533#endif
1534#if defined(CONFIG_OPTPROBES)
1535	{
1536		.procname	= "kprobes-optimization",
1537		.data		= &sysctl_kprobes_optimization,
1538		.maxlen		= sizeof(int),
1539		.mode		= 0644,
1540		.proc_handler	= proc_kprobes_optimization_handler,
1541		.extra1		= &zero,
1542		.extra2		= &one,
1543	},
1544#endif
1545	{ }
1546};
1547
1548static struct ctl_table dev_table[] = {
1549	{ }
1550};
1551
1552int __init sysctl_init(void)
1553{
1554	register_sysctl_table(sysctl_base_table);
1555	return 0;
1556}
1557
1558#endif /* CONFIG_SYSCTL */
1559
1560/*
1561 * /proc/sys support
1562 */
1563
1564#ifdef CONFIG_PROC_SYSCTL
1565
1566static int _proc_do_string(void* data, int maxlen, int write,
1567			   void __user *buffer,
1568			   size_t *lenp, loff_t *ppos)
1569{
1570	size_t len;
1571	char __user *p;
1572	char c;
1573
1574	if (!data || !maxlen || !*lenp) {
1575		*lenp = 0;
1576		return 0;
1577	}
1578
1579	if (write) {
1580		len = 0;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1581		p = buffer;
1582		while (len < *lenp) {
1583			if (get_user(c, p++))
1584				return -EFAULT;
1585			if (c == 0 || c == '\n')
1586				break;
1587			len++;
1588		}
1589		if (len >= maxlen)
1590			len = maxlen-1;
1591		if(copy_from_user(data, buffer, len))
1592			return -EFAULT;
1593		((char *) data)[len] = 0;
1594		*ppos += *lenp;
1595	} else {
1596		len = strlen(data);
1597		if (len > maxlen)
1598			len = maxlen;
1599
1600		if (*ppos > len) {
1601			*lenp = 0;
1602			return 0;
1603		}
1604
1605		data += *ppos;
1606		len  -= *ppos;
1607
1608		if (len > *lenp)
1609			len = *lenp;
1610		if (len)
1611			if(copy_to_user(buffer, data, len))
1612				return -EFAULT;
1613		if (len < *lenp) {
1614			if(put_user('\n', ((char __user *) buffer) + len))
1615				return -EFAULT;
1616			len++;
1617		}
1618		*lenp = len;
1619		*ppos += len;
1620	}
1621	return 0;
1622}
1623
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1624/**
1625 * proc_dostring - read a string sysctl
1626 * @table: the sysctl table
1627 * @write: %TRUE if this is a write to the sysctl file
1628 * @buffer: the user buffer
1629 * @lenp: the size of the user buffer
1630 * @ppos: file position
1631 *
1632 * Reads/writes a string from/to the user buffer. If the kernel
1633 * buffer provided is not large enough to hold the string, the
1634 * string is truncated. The copied string is %NULL-terminated.
1635 * If the string is being read by the user process, it is copied
1636 * and a newline '\n' is added. It is truncated if the buffer is
1637 * not large enough.
1638 *
1639 * Returns 0 on success.
1640 */
1641int proc_dostring(struct ctl_table *table, int write,
1642		  void __user *buffer, size_t *lenp, loff_t *ppos)
1643{
1644	return _proc_do_string(table->data, table->maxlen, write,
1645			       buffer, lenp, ppos);
 
 
 
1646}
1647
1648static size_t proc_skip_spaces(char **buf)
1649{
1650	size_t ret;
1651	char *tmp = skip_spaces(*buf);
1652	ret = tmp - *buf;
1653	*buf = tmp;
1654	return ret;
 
1655}
1656
1657static void proc_skip_char(char **buf, size_t *size, const char v)
1658{
1659	while (*size) {
1660		if (**buf != v)
1661			break;
1662		(*size)--;
1663		(*buf)++;
1664	}
1665}
1666
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1667#define TMPBUFLEN 22
1668/**
1669 * proc_get_long - reads an ASCII formatted integer from a user buffer
1670 *
1671 * @buf: a kernel buffer
1672 * @size: size of the kernel buffer
1673 * @val: this is where the number will be stored
1674 * @neg: set to %TRUE if number is negative
1675 * @perm_tr: a vector which contains the allowed trailers
1676 * @perm_tr_len: size of the perm_tr vector
1677 * @tr: pointer to store the trailer character
1678 *
1679 * In case of success %0 is returned and @buf and @size are updated with
1680 * the amount of bytes read. If @tr is non-NULL and a trailing
1681 * character exists (size is non-zero after returning from this
1682 * function), @tr is updated with the trailing character.
1683 */
1684static int proc_get_long(char **buf, size_t *size,
1685			  unsigned long *val, bool *neg,
1686			  const char *perm_tr, unsigned perm_tr_len, char *tr)
1687{
1688	int len;
1689	char *p, tmp[TMPBUFLEN];
 
1690
1691	if (!*size)
1692		return -EINVAL;
1693
1694	len = *size;
1695	if (len > TMPBUFLEN - 1)
1696		len = TMPBUFLEN - 1;
1697
1698	memcpy(tmp, *buf, len);
1699
1700	tmp[len] = 0;
1701	p = tmp;
1702	if (*p == '-' && *size > 1) {
1703		*neg = true;
1704		p++;
1705	} else
1706		*neg = false;
1707	if (!isdigit(*p))
1708		return -EINVAL;
1709
1710	*val = simple_strtoul(p, &p, 0);
 
1711
1712	len = p - tmp;
1713
1714	/* We don't know if the next char is whitespace thus we may accept
1715	 * invalid integers (e.g. 1234...a) or two integers instead of one
1716	 * (e.g. 123...1). So lets not allow such large numbers. */
1717	if (len == TMPBUFLEN - 1)
1718		return -EINVAL;
1719
1720	if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
1721		return -EINVAL;
1722
1723	if (tr && (len < *size))
1724		*tr = *p;
1725
1726	*buf += len;
1727	*size -= len;
1728
1729	return 0;
1730}
1731
1732/**
1733 * proc_put_long - converts an integer to a decimal ASCII formatted string
1734 *
1735 * @buf: the user buffer
1736 * @size: the size of the user buffer
1737 * @val: the integer to be converted
1738 * @neg: sign of the number, %TRUE for negative
1739 *
1740 * In case of success %0 is returned and @buf and @size are updated with
1741 * the amount of bytes written.
1742 */
1743static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
1744			  bool neg)
1745{
1746	int len;
1747	char tmp[TMPBUFLEN], *p = tmp;
1748
1749	sprintf(p, "%s%lu", neg ? "-" : "", val);
1750	len = strlen(tmp);
1751	if (len > *size)
1752		len = *size;
1753	if (copy_to_user(*buf, tmp, len))
1754		return -EFAULT;
1755	*size -= len;
1756	*buf += len;
1757	return 0;
1758}
1759#undef TMPBUFLEN
1760
1761static int proc_put_char(void __user **buf, size_t *size, char c)
1762{
1763	if (*size) {
1764		char __user **buffer = (char __user **)buf;
1765		if (put_user(c, *buffer))
1766			return -EFAULT;
1767		(*size)--, (*buffer)++;
 
1768		*buf = *buffer;
1769	}
1770	return 0;
1771}
1772
1773static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
1774				 int *valp,
1775				 int write, void *data)
1776{
1777	if (write) {
1778		*valp = *negp ? -*lvalp : *lvalp;
 
 
 
 
 
 
 
 
1779	} else {
1780		int val = *valp;
1781		if (val < 0) {
1782			*negp = true;
1783			*lvalp = (unsigned long)-val;
1784		} else {
1785			*negp = false;
1786			*lvalp = (unsigned long)val;
1787		}
1788	}
1789	return 0;
1790}
1791
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1792static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
1793
1794static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
1795		  int write, void __user *buffer,
1796		  size_t *lenp, loff_t *ppos,
1797		  int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
1798			      int write, void *data),
1799		  void *data)
1800{
1801	int *i, vleft, first = 1, err = 0;
1802	unsigned long page = 0;
1803	size_t left;
1804	char *kbuf;
1805	
1806	if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
1807		*lenp = 0;
1808		return 0;
1809	}
1810	
1811	i = (int *) tbl_data;
1812	vleft = table->maxlen / sizeof(*i);
1813	left = *lenp;
1814
1815	if (!conv)
1816		conv = do_proc_dointvec_conv;
1817
1818	if (write) {
 
 
 
1819		if (left > PAGE_SIZE - 1)
1820			left = PAGE_SIZE - 1;
1821		page = __get_free_page(GFP_TEMPORARY);
1822		kbuf = (char *) page;
1823		if (!kbuf)
1824			return -ENOMEM;
1825		if (copy_from_user(kbuf, buffer, left)) {
1826			err = -EFAULT;
1827			goto free;
1828		}
1829		kbuf[left] = 0;
1830	}
1831
1832	for (; left && vleft--; i++, first=0) {
1833		unsigned long lval;
1834		bool neg;
1835
1836		if (write) {
1837			left -= proc_skip_spaces(&kbuf);
1838
1839			if (!left)
1840				break;
1841			err = proc_get_long(&kbuf, &left, &lval, &neg,
1842					     proc_wspace_sep,
1843					     sizeof(proc_wspace_sep), NULL);
1844			if (err)
1845				break;
1846			if (conv(&neg, &lval, i, 1, data)) {
1847				err = -EINVAL;
1848				break;
1849			}
1850		} else {
1851			if (conv(&neg, &lval, i, 0, data)) {
1852				err = -EINVAL;
1853				break;
1854			}
1855			if (!first)
1856				err = proc_put_char(&buffer, &left, '\t');
1857			if (err)
1858				break;
1859			err = proc_put_long(&buffer, &left, lval, neg);
1860			if (err)
1861				break;
1862		}
1863	}
1864
1865	if (!write && !first && left && !err)
1866		err = proc_put_char(&buffer, &left, '\n');
1867	if (write && !err && left)
1868		left -= proc_skip_spaces(&kbuf);
1869free:
1870	if (write) {
1871		free_page(page);
1872		if (first)
1873			return err ? : -EINVAL;
1874	}
1875	*lenp -= left;
 
1876	*ppos += *lenp;
1877	return err;
1878}
1879
1880static int do_proc_dointvec(struct ctl_table *table, int write,
1881		  void __user *buffer, size_t *lenp, loff_t *ppos,
1882		  int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
1883			      int write, void *data),
1884		  void *data)
1885{
1886	return __do_proc_dointvec(table->data, table, write,
1887			buffer, lenp, ppos, conv, data);
1888}
1889
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1890/**
1891 * proc_dointvec - read a vector of integers
1892 * @table: the sysctl table
1893 * @write: %TRUE if this is a write to the sysctl file
1894 * @buffer: the user buffer
1895 * @lenp: the size of the user buffer
1896 * @ppos: file position
1897 *
1898 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1899 * values from/to the user buffer, treated as an ASCII string. 
1900 *
1901 * Returns 0 on success.
1902 */
1903int proc_dointvec(struct ctl_table *table, int write,
1904		     void __user *buffer, size_t *lenp, loff_t *ppos)
1905{
1906    return do_proc_dointvec(table,write,buffer,lenp,ppos,
1907		    	    NULL,NULL);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1908}
1909
1910/*
1911 * Taint values can only be increased
1912 * This means we can safely use a temporary.
1913 */
1914static int proc_taint(struct ctl_table *table, int write,
1915			       void __user *buffer, size_t *lenp, loff_t *ppos)
1916{
1917	struct ctl_table t;
1918	unsigned long tmptaint = get_taint();
1919	int err;
1920
1921	if (write && !capable(CAP_SYS_ADMIN))
1922		return -EPERM;
1923
1924	t = *table;
1925	t.data = &tmptaint;
1926	err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
1927	if (err < 0)
1928		return err;
1929
1930	if (write) {
 
 
 
 
 
 
 
 
 
 
1931		/*
1932		 * Poor man's atomic or. Not worth adding a primitive
1933		 * to everyone's atomic.h for this
1934		 */
1935		int i;
1936		for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
1937			if ((tmptaint >> i) & 1)
1938				add_taint(i);
1939		}
1940	}
1941
1942	return err;
1943}
1944
1945#ifdef CONFIG_PRINTK
1946static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
1947				void __user *buffer, size_t *lenp, loff_t *ppos)
1948{
1949	if (write && !capable(CAP_SYS_ADMIN))
1950		return -EPERM;
1951
1952	return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
1953}
1954#endif
1955
1956struct do_proc_dointvec_minmax_conv_param {
1957	int *min;
1958	int *max;
1959};
1960
1961static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
1962					int *valp,
1963					int write, void *data)
1964{
 
1965	struct do_proc_dointvec_minmax_conv_param *param = data;
 
 
 
 
 
 
 
 
 
 
1966	if (write) {
1967		int val = *negp ? -*lvalp : *lvalp;
1968		if ((param->min && *param->min > val) ||
1969		    (param->max && *param->max < val))
1970			return -EINVAL;
1971		*valp = val;
1972	} else {
1973		int val = *valp;
1974		if (val < 0) {
1975			*negp = true;
1976			*lvalp = (unsigned long)-val;
1977		} else {
1978			*negp = false;
1979			*lvalp = (unsigned long)val;
1980		}
1981	}
 
1982	return 0;
1983}
1984
1985/**
1986 * proc_dointvec_minmax - read a vector of integers with min/max values
1987 * @table: the sysctl table
1988 * @write: %TRUE if this is a write to the sysctl file
1989 * @buffer: the user buffer
1990 * @lenp: the size of the user buffer
1991 * @ppos: file position
1992 *
1993 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1994 * values from/to the user buffer, treated as an ASCII string.
1995 *
1996 * This routine will ensure the values are within the range specified by
1997 * table->extra1 (min) and table->extra2 (max).
1998 *
1999 * Returns 0 on success.
2000 */
2001int proc_dointvec_minmax(struct ctl_table *table, int write,
2002		  void __user *buffer, size_t *lenp, loff_t *ppos)
2003{
2004	struct do_proc_dointvec_minmax_conv_param param = {
2005		.min = (int *) table->extra1,
2006		.max = (int *) table->extra2,
2007	};
2008	return do_proc_dointvec(table, write, buffer, lenp, ppos,
2009				do_proc_dointvec_minmax_conv, &param);
2010}
2011
2012static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2013				     void __user *buffer,
2014				     size_t *lenp, loff_t *ppos,
2015				     unsigned long convmul,
2016				     unsigned long convdiv)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2017{
2018	unsigned long *i, *min, *max;
2019	int vleft, first = 1, err = 0;
2020	unsigned long page = 0;
2021	size_t left;
2022	char *kbuf;
2023
2024	if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2025		*lenp = 0;
2026		return 0;
2027	}
2028
2029	i = (unsigned long *) data;
2030	min = (unsigned long *) table->extra1;
2031	max = (unsigned long *) table->extra2;
2032	vleft = table->maxlen / sizeof(unsigned long);
2033	left = *lenp;
2034
2035	if (write) {
 
 
 
2036		if (left > PAGE_SIZE - 1)
2037			left = PAGE_SIZE - 1;
2038		page = __get_free_page(GFP_TEMPORARY);
2039		kbuf = (char *) page;
2040		if (!kbuf)
2041			return -ENOMEM;
2042		if (copy_from_user(kbuf, buffer, left)) {
2043			err = -EFAULT;
2044			goto free;
2045		}
2046		kbuf[left] = 0;
2047	}
2048
2049	for (; left && vleft--; i++, first = 0) {
2050		unsigned long val;
2051
2052		if (write) {
2053			bool neg;
2054
2055			left -= proc_skip_spaces(&kbuf);
 
 
2056
2057			err = proc_get_long(&kbuf, &left, &val, &neg,
2058					     proc_wspace_sep,
2059					     sizeof(proc_wspace_sep), NULL);
2060			if (err)
 
 
 
 
 
 
 
2061				break;
2062			if (neg)
2063				continue;
2064			if ((min && val < *min) || (max && val > *max))
2065				continue;
2066			*i = val;
2067		} else {
2068			val = convdiv * (*i) / convmul;
2069			if (!first)
2070				err = proc_put_char(&buffer, &left, '\t');
2071			err = proc_put_long(&buffer, &left, val, false);
2072			if (err)
2073				break;
2074		}
2075	}
2076
2077	if (!write && !first && left && !err)
2078		err = proc_put_char(&buffer, &left, '\n');
2079	if (write && !err)
2080		left -= proc_skip_spaces(&kbuf);
2081free:
2082	if (write) {
2083		free_page(page);
2084		if (first)
2085			return err ? : -EINVAL;
2086	}
2087	*lenp -= left;
 
2088	*ppos += *lenp;
2089	return err;
2090}
2091
2092static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2093				     void __user *buffer,
2094				     size_t *lenp, loff_t *ppos,
2095				     unsigned long convmul,
2096				     unsigned long convdiv)
2097{
2098	return __do_proc_doulongvec_minmax(table->data, table, write,
2099			buffer, lenp, ppos, convmul, convdiv);
2100}
2101
2102/**
2103 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2104 * @table: the sysctl table
2105 * @write: %TRUE if this is a write to the sysctl file
2106 * @buffer: the user buffer
2107 * @lenp: the size of the user buffer
2108 * @ppos: file position
2109 *
2110 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2111 * values from/to the user buffer, treated as an ASCII string.
2112 *
2113 * This routine will ensure the values are within the range specified by
2114 * table->extra1 (min) and table->extra2 (max).
2115 *
2116 * Returns 0 on success.
2117 */
2118int proc_doulongvec_minmax(struct ctl_table *table, int write,
2119			   void __user *buffer, size_t *lenp, loff_t *ppos)
2120{
2121    return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2122}
2123
2124/**
2125 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2126 * @table: the sysctl table
2127 * @write: %TRUE if this is a write to the sysctl file
2128 * @buffer: the user buffer
2129 * @lenp: the size of the user buffer
2130 * @ppos: file position
2131 *
2132 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2133 * values from/to the user buffer, treated as an ASCII string. The values
2134 * are treated as milliseconds, and converted to jiffies when they are stored.
2135 *
2136 * This routine will ensure the values are within the range specified by
2137 * table->extra1 (min) and table->extra2 (max).
2138 *
2139 * Returns 0 on success.
2140 */
2141int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2142				      void __user *buffer,
2143				      size_t *lenp, loff_t *ppos)
2144{
2145    return do_proc_doulongvec_minmax(table, write, buffer,
2146				     lenp, ppos, HZ, 1000l);
2147}
2148
2149
2150static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2151					 int *valp,
2152					 int write, void *data)
2153{
2154	if (write) {
2155		if (*lvalp > LONG_MAX / HZ)
2156			return 1;
2157		*valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
 
 
 
2158	} else {
2159		int val = *valp;
2160		unsigned long lval;
2161		if (val < 0) {
2162			*negp = true;
2163			lval = (unsigned long)-val;
2164		} else {
2165			*negp = false;
2166			lval = (unsigned long)val;
2167		}
2168		*lvalp = lval / HZ;
2169	}
2170	return 0;
2171}
2172
2173static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2174						int *valp,
2175						int write, void *data)
2176{
2177	if (write) {
2178		if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2179			return 1;
2180		*valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2181	} else {
2182		int val = *valp;
2183		unsigned long lval;
2184		if (val < 0) {
2185			*negp = true;
2186			lval = (unsigned long)-val;
2187		} else {
2188			*negp = false;
2189			lval = (unsigned long)val;
2190		}
2191		*lvalp = jiffies_to_clock_t(lval);
2192	}
2193	return 0;
2194}
2195
2196static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2197					    int *valp,
2198					    int write, void *data)
2199{
2200	if (write) {
2201		*valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
 
 
 
 
2202	} else {
2203		int val = *valp;
2204		unsigned long lval;
2205		if (val < 0) {
2206			*negp = true;
2207			lval = (unsigned long)-val;
2208		} else {
2209			*negp = false;
2210			lval = (unsigned long)val;
2211		}
2212		*lvalp = jiffies_to_msecs(lval);
2213	}
2214	return 0;
2215}
2216
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2217/**
2218 * proc_dointvec_jiffies - read a vector of integers as seconds
2219 * @table: the sysctl table
2220 * @write: %TRUE if this is a write to the sysctl file
2221 * @buffer: the user buffer
2222 * @lenp: the size of the user buffer
2223 * @ppos: file position
2224 *
2225 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2226 * values from/to the user buffer, treated as an ASCII string. 
2227 * The values read are assumed to be in seconds, and are converted into
2228 * jiffies.
2229 *
2230 * Returns 0 on success.
2231 */
2232int proc_dointvec_jiffies(struct ctl_table *table, int write,
2233			  void __user *buffer, size_t *lenp, loff_t *ppos)
2234{
2235    return do_proc_dointvec(table,write,buffer,lenp,ppos,
2236		    	    do_proc_dointvec_jiffies_conv,NULL);
2237}
2238
 
 
 
 
 
 
 
 
 
 
 
2239/**
2240 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2241 * @table: the sysctl table
2242 * @write: %TRUE if this is a write to the sysctl file
2243 * @buffer: the user buffer
2244 * @lenp: the size of the user buffer
2245 * @ppos: pointer to the file position
2246 *
2247 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2248 * values from/to the user buffer, treated as an ASCII string. 
2249 * The values read are assumed to be in 1/USER_HZ seconds, and 
2250 * are converted into jiffies.
2251 *
2252 * Returns 0 on success.
2253 */
2254int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2255				 void __user *buffer, size_t *lenp, loff_t *ppos)
2256{
2257    return do_proc_dointvec(table,write,buffer,lenp,ppos,
2258		    	    do_proc_dointvec_userhz_jiffies_conv,NULL);
2259}
2260
2261/**
2262 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2263 * @table: the sysctl table
2264 * @write: %TRUE if this is a write to the sysctl file
2265 * @buffer: the user buffer
2266 * @lenp: the size of the user buffer
2267 * @ppos: file position
2268 * @ppos: the current position in the file
2269 *
2270 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2271 * values from/to the user buffer, treated as an ASCII string. 
2272 * The values read are assumed to be in 1/1000 seconds, and 
2273 * are converted into jiffies.
2274 *
2275 * Returns 0 on success.
2276 */
2277int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2278			     void __user *buffer, size_t *lenp, loff_t *ppos)
2279{
2280	return do_proc_dointvec(table, write, buffer, lenp, ppos,
2281				do_proc_dointvec_ms_jiffies_conv, NULL);
2282}
2283
2284static int proc_do_cad_pid(struct ctl_table *table, int write,
2285			   void __user *buffer, size_t *lenp, loff_t *ppos)
2286{
2287	struct pid *new_pid;
2288	pid_t tmp;
2289	int r;
2290
2291	tmp = pid_vnr(cad_pid);
2292
2293	r = __do_proc_dointvec(&tmp, table, write, buffer,
2294			       lenp, ppos, NULL, NULL);
2295	if (r || !write)
2296		return r;
2297
2298	new_pid = find_get_pid(tmp);
2299	if (!new_pid)
2300		return -ESRCH;
2301
2302	put_pid(xchg(&cad_pid, new_pid));
2303	return 0;
2304}
2305
2306/**
2307 * proc_do_large_bitmap - read/write from/to a large bitmap
2308 * @table: the sysctl table
2309 * @write: %TRUE if this is a write to the sysctl file
2310 * @buffer: the user buffer
2311 * @lenp: the size of the user buffer
2312 * @ppos: file position
2313 *
2314 * The bitmap is stored at table->data and the bitmap length (in bits)
2315 * in table->maxlen.
2316 *
2317 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2318 * large bitmaps may be represented in a compact manner. Writing into
2319 * the file will clear the bitmap then update it with the given input.
2320 *
2321 * Returns 0 on success.
2322 */
2323int proc_do_large_bitmap(struct ctl_table *table, int write,
2324			 void __user *buffer, size_t *lenp, loff_t *ppos)
2325{
2326	int err = 0;
2327	bool first = 1;
2328	size_t left = *lenp;
2329	unsigned long bitmap_len = table->maxlen;
2330	unsigned long *bitmap = (unsigned long *) table->data;
2331	unsigned long *tmp_bitmap = NULL;
2332	char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2333
2334	if (!bitmap_len || !left || (*ppos && !write)) {
2335		*lenp = 0;
2336		return 0;
2337	}
2338
2339	if (write) {
2340		unsigned long page = 0;
2341		char *kbuf;
2342
2343		if (left > PAGE_SIZE - 1)
2344			left = PAGE_SIZE - 1;
 
 
 
2345
2346		page = __get_free_page(GFP_TEMPORARY);
2347		kbuf = (char *) page;
2348		if (!kbuf)
2349			return -ENOMEM;
2350		if (copy_from_user(kbuf, buffer, left)) {
2351			free_page(page);
2352			return -EFAULT;
2353                }
2354		kbuf[left] = 0;
2355
2356		tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
2357				     GFP_KERNEL);
2358		if (!tmp_bitmap) {
2359			free_page(page);
2360			return -ENOMEM;
2361		}
2362		proc_skip_char(&kbuf, &left, '\n');
2363		while (!err && left) {
2364			unsigned long val_a, val_b;
2365			bool neg;
 
2366
2367			err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a,
 
 
2368					     sizeof(tr_a), &c);
 
 
 
 
 
 
 
 
 
 
2369			if (err)
2370				break;
2371			if (val_a >= bitmap_len || neg) {
2372				err = -EINVAL;
2373				break;
2374			}
2375
2376			val_b = val_a;
2377			if (left) {
2378				kbuf++;
2379				left--;
2380			}
2381
2382			if (c == '-') {
2383				err = proc_get_long(&kbuf, &left, &val_b,
2384						     &neg, tr_b, sizeof(tr_b),
2385						     &c);
 
 
 
 
 
 
 
 
 
2386				if (err)
2387					break;
2388				if (val_b >= bitmap_len || neg ||
2389				    val_a > val_b) {
2390					err = -EINVAL;
2391					break;
2392				}
2393				if (left) {
2394					kbuf++;
2395					left--;
2396				}
2397			}
2398
2399			bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
2400			first = 0;
2401			proc_skip_char(&kbuf, &left, '\n');
2402		}
2403		free_page(page);
2404	} else {
2405		unsigned long bit_a, bit_b = 0;
 
2406
2407		while (left) {
2408			bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
2409			if (bit_a >= bitmap_len)
2410				break;
2411			bit_b = find_next_zero_bit(bitmap, bitmap_len,
2412						   bit_a + 1) - 1;
2413
2414			if (!first) {
2415				err = proc_put_char(&buffer, &left, ',');
2416				if (err)
2417					break;
2418			}
2419			err = proc_put_long(&buffer, &left, bit_a, false);
2420			if (err)
2421				break;
2422			if (bit_a != bit_b) {
2423				err = proc_put_char(&buffer, &left, '-');
2424				if (err)
2425					break;
2426				err = proc_put_long(&buffer, &left, bit_b, false);
2427				if (err)
2428					break;
2429			}
2430
2431			first = 0; bit_b++;
2432		}
2433		if (!err)
2434			err = proc_put_char(&buffer, &left, '\n');
2435	}
2436
2437	if (!err) {
2438		if (write) {
2439			if (*ppos)
2440				bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
2441			else
2442				bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
2443		}
2444		kfree(tmp_bitmap);
2445		*lenp -= left;
2446		*ppos += *lenp;
2447		return 0;
2448	} else {
2449		kfree(tmp_bitmap);
2450		return err;
2451	}
 
 
 
2452}
2453
2454#else /* CONFIG_PROC_SYSCTL */
2455
2456int proc_dostring(struct ctl_table *table, int write,
2457		  void __user *buffer, size_t *lenp, loff_t *ppos)
 
 
 
 
 
 
2458{
2459	return -ENOSYS;
2460}
2461
2462int proc_dointvec(struct ctl_table *table, int write,
2463		  void __user *buffer, size_t *lenp, loff_t *ppos)
 
 
 
 
 
 
2464{
2465	return -ENOSYS;
2466}
2467
2468int proc_dointvec_minmax(struct ctl_table *table, int write,
2469		    void __user *buffer, size_t *lenp, loff_t *ppos)
 
 
 
 
 
 
 
 
 
 
 
 
2470{
2471	return -ENOSYS;
2472}
2473
2474int proc_dointvec_jiffies(struct ctl_table *table, int write,
2475		    void __user *buffer, size_t *lenp, loff_t *ppos)
 
 
 
 
 
 
2476{
2477	return -ENOSYS;
2478}
2479
2480int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2481		    void __user *buffer, size_t *lenp, loff_t *ppos)
2482{
2483	return -ENOSYS;
2484}
2485
2486int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2487			     void __user *buffer, size_t *lenp, loff_t *ppos)
2488{
2489	return -ENOSYS;
2490}
2491
2492int proc_doulongvec_minmax(struct ctl_table *table, int write,
2493		    void __user *buffer, size_t *lenp, loff_t *ppos)
2494{
2495	return -ENOSYS;
2496}
2497
2498int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2499				      void __user *buffer,
2500				      size_t *lenp, loff_t *ppos)
2501{
2502    return -ENOSYS;
2503}
2504
 
 
 
 
 
2505
2506#endif /* CONFIG_PROC_SYSCTL */
2507
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2508/*
2509 * No sense putting this after each symbol definition, twice,
2510 * exception granted :-)
2511 */
 
2512EXPORT_SYMBOL(proc_dointvec);
 
2513EXPORT_SYMBOL(proc_dointvec_jiffies);
2514EXPORT_SYMBOL(proc_dointvec_minmax);
 
2515EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2516EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2517EXPORT_SYMBOL(proc_dostring);
2518EXPORT_SYMBOL(proc_doulongvec_minmax);
2519EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);