use clamp_t in UNAME26 fix
[linux-2.6.git] / kernel / sysctl.c
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. */
96 extern int sysctl_overcommit_memory;
97 extern int sysctl_overcommit_ratio;
98 extern int max_threads;
99 extern int core_uses_pid;
100 extern int suid_dumpable;
101 extern char core_pattern[];
102 extern unsigned int core_pipe_limit;
103 extern int pid_max;
104 extern int min_free_kbytes;
105 extern int pid_max_min, pid_max_max;
106 extern int sysctl_drop_caches;
107 extern int percpu_pagelist_fraction;
108 extern int compat_log;
109 extern int latencytop_enabled;
110 extern int sysctl_nr_open_min, sysctl_nr_open_max;
111 #ifndef CONFIG_MMU
112 extern int sysctl_nr_trim_pages;
113 #endif
114 #ifdef CONFIG_BLOCK
115 extern int blk_iopoll_enabled;
116 #endif
117
118 /* Constants used for minimum and  maximum */
119 #ifdef CONFIG_LOCKUP_DETECTOR
120 static int sixty = 60;
121 static int neg_one = -1;
122 #endif
123
124 static int zero;
125 static int __maybe_unused one = 1;
126 static int __maybe_unused two = 2;
127 static int __maybe_unused three = 3;
128 static unsigned long one_ul = 1;
129 static int one_hundred = 100;
130 #ifdef CONFIG_PRINTK
131 static int ten_thousand = 10000;
132 #endif
133
134 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
135 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
136
137 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
138 static int maxolduid = 65535;
139 static int minolduid;
140 static int min_percpu_pagelist_fract = 8;
141
142 static int ngroups_max = NGROUPS_MAX;
143 static 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
152 extern int sysctl_tsb_ratio;
153 #endif
154
155 #ifdef __hppa__
156 extern int pwrsw_enabled;
157 extern int unaligned_enabled;
158 #endif
159
160 #ifdef CONFIG_IA64
161 extern int no_unaligned_warning;
162 extern int unaligned_dump_stack;
163 #endif
164
165 #ifdef CONFIG_PROC_SYSCTL
166 static int proc_do_cad_pid(struct ctl_table *table, int write,
167                   void __user *buffer, size_t *lenp, loff_t *ppos);
168 static int proc_taint(struct ctl_table *table, int write,
169                                void __user *buffer, size_t *lenp, loff_t *ppos);
170 #endif
171
172 #ifdef CONFIG_PRINTK
173 static 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 */
179 static int __sysrq_enabled = SYSRQ_DEFAULT_ENABLE;
180
181 static 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
199 static struct ctl_table kern_table[];
200 static struct ctl_table vm_table[];
201 static struct ctl_table fs_table[];
202 static struct ctl_table debug_table[];
203 static struct ctl_table dev_table[];
204 extern struct ctl_table random_table[];
205 #ifdef CONFIG_EPOLL
206 extern struct ctl_table epoll_table[];
207 #endif
208
209 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
210 int sysctl_legacy_va_layout;
211 #endif
212
213 /* The default sysctl tables: */
214
215 static 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
245 static int min_sched_granularity_ns = 100000;           /* 100 usecs */
246 static int max_sched_granularity_ns = NSEC_PER_SEC;     /* 1 second */
247 static int min_wakeup_granularity_ns;                   /* 0 usecs */
248 static int max_wakeup_granularity_ns = NSEC_PER_SEC;    /* 1 second */
249 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
250 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
251 #endif
252
253 #ifdef CONFIG_COMPACTION
254 static int min_extfrag_threshold;
255 static int max_extfrag_threshold = 1000;
256 #endif
257
258 static 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
1000 static 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)
1369 static struct ctl_table binfmt_misc_table[] = {
1370         { }
1371 };
1372 #endif
1373
1374 static 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
1523 static 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
1548 static struct ctl_table dev_table[] = {
1549         { }
1550 };
1551
1552 int __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
1566 static 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  */
1641 int 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
1648 static 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
1657 static 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  */
1684 static 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  */
1743 static 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
1761 static 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
1773 static 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
1792 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
1793
1794 static 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);
1869 free:
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
1880 static 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  */
1903 int 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  */
1914 static 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
1946 static 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
1956 struct do_proc_dointvec_minmax_conv_param {
1957         int *min;
1958         int *max;
1959 };
1960
1961 static 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  */
2001 int 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
2012 static 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);
2081 free:
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
2092 static 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  */
2118 int 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  */
2141 int 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
2150 static 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
2173 static 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
2196 static 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  */
2232 int 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  */
2254 int 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  */
2277 int 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
2284 static 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  */
2323 int 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
2456 int proc_dostring(struct ctl_table *table, int write,
2457                   void __user *buffer, size_t *lenp, loff_t *ppos)
2458 {
2459         return -ENOSYS;
2460 }
2461
2462 int proc_dointvec(struct ctl_table *table, int write,
2463                   void __user *buffer, size_t *lenp, loff_t *ppos)
2464 {
2465         return -ENOSYS;
2466 }
2467
2468 int 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
2474 int 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
2480 int 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
2486 int 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
2492 int 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
2498 int 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  */
2512 EXPORT_SYMBOL(proc_dointvec);
2513 EXPORT_SYMBOL(proc_dointvec_jiffies);
2514 EXPORT_SYMBOL(proc_dointvec_minmax);
2515 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2516 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2517 EXPORT_SYMBOL(proc_dostring);
2518 EXPORT_SYMBOL(proc_doulongvec_minmax);
2519 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);