sysctl extern cleanup: rcu
[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/signal.h>
27 #include <linux/proc_fs.h>
28 #include <linux/security.h>
29 #include <linux/ctype.h>
30 #include <linux/kmemcheck.h>
31 #include <linux/fs.h>
32 #include <linux/init.h>
33 #include <linux/kernel.h>
34 #include <linux/kobject.h>
35 #include <linux/net.h>
36 #include <linux/sysrq.h>
37 #include <linux/highuid.h>
38 #include <linux/writeback.h>
39 #include <linux/ratelimit.h>
40 #include <linux/hugetlb.h>
41 #include <linux/initrd.h>
42 #include <linux/key.h>
43 #include <linux/times.h>
44 #include <linux/limits.h>
45 #include <linux/dcache.h>
46 #include <linux/syscalls.h>
47 #include <linux/vmstat.h>
48 #include <linux/nfs_fs.h>
49 #include <linux/acpi.h>
50 #include <linux/reboot.h>
51 #include <linux/ftrace.h>
52 #include <linux/slow-work.h>
53 #include <linux/perf_event.h>
54 #include <linux/kprobes.h>
55
56 #include <asm/uaccess.h>
57 #include <asm/processor.h>
58
59 #ifdef CONFIG_X86
60 #include <asm/nmi.h>
61 #include <asm/stacktrace.h>
62 #include <asm/io.h>
63 #endif
64
65
66 #if defined(CONFIG_SYSCTL)
67
68 /* External variables not in a header file. */
69 extern int sysctl_overcommit_memory;
70 extern int sysctl_overcommit_ratio;
71 extern int sysctl_panic_on_oom;
72 extern int sysctl_oom_kill_allocating_task;
73 extern int sysctl_oom_dump_tasks;
74 extern int max_threads;
75 extern int core_uses_pid;
76 extern int suid_dumpable;
77 extern char core_pattern[];
78 extern unsigned int core_pipe_limit;
79 extern int pid_max;
80 extern int min_free_kbytes;
81 extern int pid_max_min, pid_max_max;
82 extern int sysctl_drop_caches;
83 extern int percpu_pagelist_fraction;
84 extern int compat_log;
85 extern int latencytop_enabled;
86 extern int sysctl_nr_open_min, sysctl_nr_open_max;
87 #ifndef CONFIG_MMU
88 extern int sysctl_nr_trim_pages;
89 #endif
90 #ifdef CONFIG_BLOCK
91 extern int blk_iopoll_enabled;
92 #endif
93
94 /* Constants used for minimum and  maximum */
95 #ifdef CONFIG_DETECT_SOFTLOCKUP
96 static int sixty = 60;
97 static int neg_one = -1;
98 #endif
99
100 static int zero;
101 static int __maybe_unused one = 1;
102 static int __maybe_unused two = 2;
103 static unsigned long one_ul = 1;
104 static int one_hundred = 100;
105 #ifdef CONFIG_PRINTK
106 static int ten_thousand = 10000;
107 #endif
108
109 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
110 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
111
112 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
113 static int maxolduid = 65535;
114 static int minolduid;
115 static int min_percpu_pagelist_fract = 8;
116
117 static int ngroups_max = NGROUPS_MAX;
118
119 #ifdef CONFIG_MODULES
120 extern char modprobe_path[];
121 extern int modules_disabled;
122 #endif
123 #ifdef CONFIG_CHR_DEV_SG
124 extern int sg_big_buff;
125 #endif
126
127 #ifdef CONFIG_SPARC
128 #include <asm/system.h>
129 #endif
130
131 #ifdef CONFIG_SPARC64
132 extern int sysctl_tsb_ratio;
133 #endif
134
135 #ifdef __hppa__
136 extern int pwrsw_enabled;
137 extern int unaligned_enabled;
138 #endif
139
140 #ifdef CONFIG_S390
141 #ifdef CONFIG_MATHEMU
142 extern int sysctl_ieee_emulation_warnings;
143 #endif
144 extern int sysctl_userprocess_debug;
145 extern int spin_retry;
146 #endif
147
148 #ifdef CONFIG_BSD_PROCESS_ACCT
149 extern int acct_parm[];
150 #endif
151
152 #ifdef CONFIG_IA64
153 extern int no_unaligned_warning;
154 extern int unaligned_dump_stack;
155 #endif
156
157 extern struct ratelimit_state printk_ratelimit_state;
158
159 #ifdef CONFIG_RT_MUTEXES
160 extern int max_lock_depth;
161 #endif
162
163 #ifdef CONFIG_PROC_SYSCTL
164 static int proc_do_cad_pid(struct ctl_table *table, int write,
165                   void __user *buffer, size_t *lenp, loff_t *ppos);
166 static int proc_taint(struct ctl_table *table, int write,
167                                void __user *buffer, size_t *lenp, loff_t *ppos);
168 #endif
169
170 static struct ctl_table root_table[];
171 static struct ctl_table_root sysctl_table_root;
172 static struct ctl_table_header root_table_header = {
173         .count = 1,
174         .ctl_table = root_table,
175         .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.default_set.list),
176         .root = &sysctl_table_root,
177         .set = &sysctl_table_root.default_set,
178 };
179 static struct ctl_table_root sysctl_table_root = {
180         .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list),
181         .default_set.list = LIST_HEAD_INIT(root_table_header.ctl_entry),
182 };
183
184 static struct ctl_table kern_table[];
185 static struct ctl_table vm_table[];
186 static struct ctl_table fs_table[];
187 static struct ctl_table debug_table[];
188 static struct ctl_table dev_table[];
189 extern struct ctl_table random_table[];
190 #ifdef CONFIG_INOTIFY_USER
191 extern struct ctl_table inotify_table[];
192 #endif
193 #ifdef CONFIG_EPOLL
194 extern struct ctl_table epoll_table[];
195 #endif
196
197 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
198 int sysctl_legacy_va_layout;
199 #endif
200
201 extern int prove_locking;
202 extern int lock_stat;
203
204 /* The default sysctl tables: */
205
206 static struct ctl_table root_table[] = {
207         {
208                 .procname       = "kernel",
209                 .mode           = 0555,
210                 .child          = kern_table,
211         },
212         {
213                 .procname       = "vm",
214                 .mode           = 0555,
215                 .child          = vm_table,
216         },
217         {
218                 .procname       = "fs",
219                 .mode           = 0555,
220                 .child          = fs_table,
221         },
222         {
223                 .procname       = "debug",
224                 .mode           = 0555,
225                 .child          = debug_table,
226         },
227         {
228                 .procname       = "dev",
229                 .mode           = 0555,
230                 .child          = dev_table,
231         },
232 /*
233  * NOTE: do not add new entries to this table unless you have read
234  * Documentation/sysctl/ctl_unnumbered.txt
235  */
236         { }
237 };
238
239 #ifdef CONFIG_SCHED_DEBUG
240 static int min_sched_granularity_ns = 100000;           /* 100 usecs */
241 static int max_sched_granularity_ns = NSEC_PER_SEC;     /* 1 second */
242 static int min_wakeup_granularity_ns;                   /* 0 usecs */
243 static int max_wakeup_granularity_ns = NSEC_PER_SEC;    /* 1 second */
244 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
245 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
246 static int min_sched_shares_ratelimit = 100000; /* 100 usec */
247 static int max_sched_shares_ratelimit = NSEC_PER_SEC; /* 1 second */
248 #endif
249
250 static struct ctl_table kern_table[] = {
251         {
252                 .procname       = "sched_child_runs_first",
253                 .data           = &sysctl_sched_child_runs_first,
254                 .maxlen         = sizeof(unsigned int),
255                 .mode           = 0644,
256                 .proc_handler   = proc_dointvec,
257         },
258 #ifdef CONFIG_SCHED_DEBUG
259         {
260                 .procname       = "sched_min_granularity_ns",
261                 .data           = &sysctl_sched_min_granularity,
262                 .maxlen         = sizeof(unsigned int),
263                 .mode           = 0644,
264                 .proc_handler   = sched_proc_update_handler,
265                 .extra1         = &min_sched_granularity_ns,
266                 .extra2         = &max_sched_granularity_ns,
267         },
268         {
269                 .procname       = "sched_latency_ns",
270                 .data           = &sysctl_sched_latency,
271                 .maxlen         = sizeof(unsigned int),
272                 .mode           = 0644,
273                 .proc_handler   = sched_proc_update_handler,
274                 .extra1         = &min_sched_granularity_ns,
275                 .extra2         = &max_sched_granularity_ns,
276         },
277         {
278                 .procname       = "sched_wakeup_granularity_ns",
279                 .data           = &sysctl_sched_wakeup_granularity,
280                 .maxlen         = sizeof(unsigned int),
281                 .mode           = 0644,
282                 .proc_handler   = sched_proc_update_handler,
283                 .extra1         = &min_wakeup_granularity_ns,
284                 .extra2         = &max_wakeup_granularity_ns,
285         },
286         {
287                 .procname       = "sched_shares_ratelimit",
288                 .data           = &sysctl_sched_shares_ratelimit,
289                 .maxlen         = sizeof(unsigned int),
290                 .mode           = 0644,
291                 .proc_handler   = sched_proc_update_handler,
292                 .extra1         = &min_sched_shares_ratelimit,
293                 .extra2         = &max_sched_shares_ratelimit,
294         },
295         {
296                 .procname       = "sched_tunable_scaling",
297                 .data           = &sysctl_sched_tunable_scaling,
298                 .maxlen         = sizeof(enum sched_tunable_scaling),
299                 .mode           = 0644,
300                 .proc_handler   = sched_proc_update_handler,
301                 .extra1         = &min_sched_tunable_scaling,
302                 .extra2         = &max_sched_tunable_scaling,
303         },
304         {
305                 .procname       = "sched_shares_thresh",
306                 .data           = &sysctl_sched_shares_thresh,
307                 .maxlen         = sizeof(unsigned int),
308                 .mode           = 0644,
309                 .proc_handler   = proc_dointvec_minmax,
310                 .extra1         = &zero,
311         },
312         {
313                 .procname       = "sched_migration_cost",
314                 .data           = &sysctl_sched_migration_cost,
315                 .maxlen         = sizeof(unsigned int),
316                 .mode           = 0644,
317                 .proc_handler   = proc_dointvec,
318         },
319         {
320                 .procname       = "sched_nr_migrate",
321                 .data           = &sysctl_sched_nr_migrate,
322                 .maxlen         = sizeof(unsigned int),
323                 .mode           = 0644,
324                 .proc_handler   = proc_dointvec,
325         },
326         {
327                 .procname       = "sched_time_avg",
328                 .data           = &sysctl_sched_time_avg,
329                 .maxlen         = sizeof(unsigned int),
330                 .mode           = 0644,
331                 .proc_handler   = proc_dointvec,
332         },
333         {
334                 .procname       = "timer_migration",
335                 .data           = &sysctl_timer_migration,
336                 .maxlen         = sizeof(unsigned int),
337                 .mode           = 0644,
338                 .proc_handler   = proc_dointvec_minmax,
339                 .extra1         = &zero,
340                 .extra2         = &one,
341         },
342 #endif
343         {
344                 .procname       = "sched_rt_period_us",
345                 .data           = &sysctl_sched_rt_period,
346                 .maxlen         = sizeof(unsigned int),
347                 .mode           = 0644,
348                 .proc_handler   = sched_rt_handler,
349         },
350         {
351                 .procname       = "sched_rt_runtime_us",
352                 .data           = &sysctl_sched_rt_runtime,
353                 .maxlen         = sizeof(int),
354                 .mode           = 0644,
355                 .proc_handler   = sched_rt_handler,
356         },
357         {
358                 .procname       = "sched_compat_yield",
359                 .data           = &sysctl_sched_compat_yield,
360                 .maxlen         = sizeof(unsigned int),
361                 .mode           = 0644,
362                 .proc_handler   = proc_dointvec,
363         },
364 #ifdef CONFIG_PROVE_LOCKING
365         {
366                 .procname       = "prove_locking",
367                 .data           = &prove_locking,
368                 .maxlen         = sizeof(int),
369                 .mode           = 0644,
370                 .proc_handler   = proc_dointvec,
371         },
372 #endif
373 #ifdef CONFIG_LOCK_STAT
374         {
375                 .procname       = "lock_stat",
376                 .data           = &lock_stat,
377                 .maxlen         = sizeof(int),
378                 .mode           = 0644,
379                 .proc_handler   = proc_dointvec,
380         },
381 #endif
382         {
383                 .procname       = "panic",
384                 .data           = &panic_timeout,
385                 .maxlen         = sizeof(int),
386                 .mode           = 0644,
387                 .proc_handler   = proc_dointvec,
388         },
389         {
390                 .procname       = "core_uses_pid",
391                 .data           = &core_uses_pid,
392                 .maxlen         = sizeof(int),
393                 .mode           = 0644,
394                 .proc_handler   = proc_dointvec,
395         },
396         {
397                 .procname       = "core_pattern",
398                 .data           = core_pattern,
399                 .maxlen         = CORENAME_MAX_SIZE,
400                 .mode           = 0644,
401                 .proc_handler   = proc_dostring,
402         },
403         {
404                 .procname       = "core_pipe_limit",
405                 .data           = &core_pipe_limit,
406                 .maxlen         = sizeof(unsigned int),
407                 .mode           = 0644,
408                 .proc_handler   = proc_dointvec,
409         },
410 #ifdef CONFIG_PROC_SYSCTL
411         {
412                 .procname       = "tainted",
413                 .maxlen         = sizeof(long),
414                 .mode           = 0644,
415                 .proc_handler   = proc_taint,
416         },
417 #endif
418 #ifdef CONFIG_LATENCYTOP
419         {
420                 .procname       = "latencytop",
421                 .data           = &latencytop_enabled,
422                 .maxlen         = sizeof(int),
423                 .mode           = 0644,
424                 .proc_handler   = proc_dointvec,
425         },
426 #endif
427 #ifdef CONFIG_BLK_DEV_INITRD
428         {
429                 .procname       = "real-root-dev",
430                 .data           = &real_root_dev,
431                 .maxlen         = sizeof(int),
432                 .mode           = 0644,
433                 .proc_handler   = proc_dointvec,
434         },
435 #endif
436         {
437                 .procname       = "print-fatal-signals",
438                 .data           = &print_fatal_signals,
439                 .maxlen         = sizeof(int),
440                 .mode           = 0644,
441                 .proc_handler   = proc_dointvec,
442         },
443 #ifdef CONFIG_SPARC
444         {
445                 .procname       = "reboot-cmd",
446                 .data           = reboot_command,
447                 .maxlen         = 256,
448                 .mode           = 0644,
449                 .proc_handler   = proc_dostring,
450         },
451         {
452                 .procname       = "stop-a",
453                 .data           = &stop_a_enabled,
454                 .maxlen         = sizeof (int),
455                 .mode           = 0644,
456                 .proc_handler   = proc_dointvec,
457         },
458         {
459                 .procname       = "scons-poweroff",
460                 .data           = &scons_pwroff,
461                 .maxlen         = sizeof (int),
462                 .mode           = 0644,
463                 .proc_handler   = proc_dointvec,
464         },
465 #endif
466 #ifdef CONFIG_SPARC64
467         {
468                 .procname       = "tsb-ratio",
469                 .data           = &sysctl_tsb_ratio,
470                 .maxlen         = sizeof (int),
471                 .mode           = 0644,
472                 .proc_handler   = proc_dointvec,
473         },
474 #endif
475 #ifdef __hppa__
476         {
477                 .procname       = "soft-power",
478                 .data           = &pwrsw_enabled,
479                 .maxlen         = sizeof (int),
480                 .mode           = 0644,
481                 .proc_handler   = proc_dointvec,
482         },
483         {
484                 .procname       = "unaligned-trap",
485                 .data           = &unaligned_enabled,
486                 .maxlen         = sizeof (int),
487                 .mode           = 0644,
488                 .proc_handler   = proc_dointvec,
489         },
490 #endif
491         {
492                 .procname       = "ctrl-alt-del",
493                 .data           = &C_A_D,
494                 .maxlen         = sizeof(int),
495                 .mode           = 0644,
496                 .proc_handler   = proc_dointvec,
497         },
498 #ifdef CONFIG_FUNCTION_TRACER
499         {
500                 .procname       = "ftrace_enabled",
501                 .data           = &ftrace_enabled,
502                 .maxlen         = sizeof(int),
503                 .mode           = 0644,
504                 .proc_handler   = ftrace_enable_sysctl,
505         },
506 #endif
507 #ifdef CONFIG_STACK_TRACER
508         {
509                 .procname       = "stack_tracer_enabled",
510                 .data           = &stack_tracer_enabled,
511                 .maxlen         = sizeof(int),
512                 .mode           = 0644,
513                 .proc_handler   = stack_trace_sysctl,
514         },
515 #endif
516 #ifdef CONFIG_TRACING
517         {
518                 .procname       = "ftrace_dump_on_oops",
519                 .data           = &ftrace_dump_on_oops,
520                 .maxlen         = sizeof(int),
521                 .mode           = 0644,
522                 .proc_handler   = proc_dointvec,
523         },
524 #endif
525 #ifdef CONFIG_MODULES
526         {
527                 .procname       = "modprobe",
528                 .data           = &modprobe_path,
529                 .maxlen         = KMOD_PATH_LEN,
530                 .mode           = 0644,
531                 .proc_handler   = proc_dostring,
532         },
533         {
534                 .procname       = "modules_disabled",
535                 .data           = &modules_disabled,
536                 .maxlen         = sizeof(int),
537                 .mode           = 0644,
538                 /* only handle a transition from default "0" to "1" */
539                 .proc_handler   = proc_dointvec_minmax,
540                 .extra1         = &one,
541                 .extra2         = &one,
542         },
543 #endif
544 #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
545         {
546                 .procname       = "hotplug",
547                 .data           = &uevent_helper,
548                 .maxlen         = UEVENT_HELPER_PATH_LEN,
549                 .mode           = 0644,
550                 .proc_handler   = proc_dostring,
551         },
552 #endif
553 #ifdef CONFIG_CHR_DEV_SG
554         {
555                 .procname       = "sg-big-buff",
556                 .data           = &sg_big_buff,
557                 .maxlen         = sizeof (int),
558                 .mode           = 0444,
559                 .proc_handler   = proc_dointvec,
560         },
561 #endif
562 #ifdef CONFIG_BSD_PROCESS_ACCT
563         {
564                 .procname       = "acct",
565                 .data           = &acct_parm,
566                 .maxlen         = 3*sizeof(int),
567                 .mode           = 0644,
568                 .proc_handler   = proc_dointvec,
569         },
570 #endif
571 #ifdef CONFIG_MAGIC_SYSRQ
572         {
573                 .procname       = "sysrq",
574                 .data           = &__sysrq_enabled,
575                 .maxlen         = sizeof (int),
576                 .mode           = 0644,
577                 .proc_handler   = proc_dointvec,
578         },
579 #endif
580 #ifdef CONFIG_PROC_SYSCTL
581         {
582                 .procname       = "cad_pid",
583                 .data           = NULL,
584                 .maxlen         = sizeof (int),
585                 .mode           = 0600,
586                 .proc_handler   = proc_do_cad_pid,
587         },
588 #endif
589         {
590                 .procname       = "threads-max",
591                 .data           = &max_threads,
592                 .maxlen         = sizeof(int),
593                 .mode           = 0644,
594                 .proc_handler   = proc_dointvec,
595         },
596         {
597                 .procname       = "random",
598                 .mode           = 0555,
599                 .child          = random_table,
600         },
601         {
602                 .procname       = "overflowuid",
603                 .data           = &overflowuid,
604                 .maxlen         = sizeof(int),
605                 .mode           = 0644,
606                 .proc_handler   = proc_dointvec_minmax,
607                 .extra1         = &minolduid,
608                 .extra2         = &maxolduid,
609         },
610         {
611                 .procname       = "overflowgid",
612                 .data           = &overflowgid,
613                 .maxlen         = sizeof(int),
614                 .mode           = 0644,
615                 .proc_handler   = proc_dointvec_minmax,
616                 .extra1         = &minolduid,
617                 .extra2         = &maxolduid,
618         },
619 #ifdef CONFIG_S390
620 #ifdef CONFIG_MATHEMU
621         {
622                 .procname       = "ieee_emulation_warnings",
623                 .data           = &sysctl_ieee_emulation_warnings,
624                 .maxlen         = sizeof(int),
625                 .mode           = 0644,
626                 .proc_handler   = proc_dointvec,
627         },
628 #endif
629         {
630                 .procname       = "userprocess_debug",
631                 .data           = &sysctl_userprocess_debug,
632                 .maxlen         = sizeof(int),
633                 .mode           = 0644,
634                 .proc_handler   = proc_dointvec,
635         },
636 #endif
637         {
638                 .procname       = "pid_max",
639                 .data           = &pid_max,
640                 .maxlen         = sizeof (int),
641                 .mode           = 0644,
642                 .proc_handler   = proc_dointvec_minmax,
643                 .extra1         = &pid_max_min,
644                 .extra2         = &pid_max_max,
645         },
646         {
647                 .procname       = "panic_on_oops",
648                 .data           = &panic_on_oops,
649                 .maxlen         = sizeof(int),
650                 .mode           = 0644,
651                 .proc_handler   = proc_dointvec,
652         },
653 #if defined CONFIG_PRINTK
654         {
655                 .procname       = "printk",
656                 .data           = &console_loglevel,
657                 .maxlen         = 4*sizeof(int),
658                 .mode           = 0644,
659                 .proc_handler   = proc_dointvec,
660         },
661         {
662                 .procname       = "printk_ratelimit",
663                 .data           = &printk_ratelimit_state.interval,
664                 .maxlen         = sizeof(int),
665                 .mode           = 0644,
666                 .proc_handler   = proc_dointvec_jiffies,
667         },
668         {
669                 .procname       = "printk_ratelimit_burst",
670                 .data           = &printk_ratelimit_state.burst,
671                 .maxlen         = sizeof(int),
672                 .mode           = 0644,
673                 .proc_handler   = proc_dointvec,
674         },
675         {
676                 .procname       = "printk_delay",
677                 .data           = &printk_delay_msec,
678                 .maxlen         = sizeof(int),
679                 .mode           = 0644,
680                 .proc_handler   = proc_dointvec_minmax,
681                 .extra1         = &zero,
682                 .extra2         = &ten_thousand,
683         },
684 #endif
685         {
686                 .procname       = "ngroups_max",
687                 .data           = &ngroups_max,
688                 .maxlen         = sizeof (int),
689                 .mode           = 0444,
690                 .proc_handler   = proc_dointvec,
691         },
692 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
693         {
694                 .procname       = "unknown_nmi_panic",
695                 .data           = &unknown_nmi_panic,
696                 .maxlen         = sizeof (int),
697                 .mode           = 0644,
698                 .proc_handler   = proc_dointvec,
699         },
700         {
701                 .procname       = "nmi_watchdog",
702                 .data           = &nmi_watchdog_enabled,
703                 .maxlen         = sizeof (int),
704                 .mode           = 0644,
705                 .proc_handler   = proc_nmi_enabled,
706         },
707 #endif
708 #if defined(CONFIG_X86)
709         {
710                 .procname       = "panic_on_unrecovered_nmi",
711                 .data           = &panic_on_unrecovered_nmi,
712                 .maxlen         = sizeof(int),
713                 .mode           = 0644,
714                 .proc_handler   = proc_dointvec,
715         },
716         {
717                 .procname       = "panic_on_io_nmi",
718                 .data           = &panic_on_io_nmi,
719                 .maxlen         = sizeof(int),
720                 .mode           = 0644,
721                 .proc_handler   = proc_dointvec,
722         },
723         {
724                 .procname       = "bootloader_type",
725                 .data           = &bootloader_type,
726                 .maxlen         = sizeof (int),
727                 .mode           = 0444,
728                 .proc_handler   = proc_dointvec,
729         },
730         {
731                 .procname       = "bootloader_version",
732                 .data           = &bootloader_version,
733                 .maxlen         = sizeof (int),
734                 .mode           = 0444,
735                 .proc_handler   = proc_dointvec,
736         },
737         {
738                 .procname       = "kstack_depth_to_print",
739                 .data           = &kstack_depth_to_print,
740                 .maxlen         = sizeof(int),
741                 .mode           = 0644,
742                 .proc_handler   = proc_dointvec,
743         },
744         {
745                 .procname       = "io_delay_type",
746                 .data           = &io_delay_type,
747                 .maxlen         = sizeof(int),
748                 .mode           = 0644,
749                 .proc_handler   = proc_dointvec,
750         },
751 #endif
752 #if defined(CONFIG_MMU)
753         {
754                 .procname       = "randomize_va_space",
755                 .data           = &randomize_va_space,
756                 .maxlen         = sizeof(int),
757                 .mode           = 0644,
758                 .proc_handler   = proc_dointvec,
759         },
760 #endif
761 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
762         {
763                 .procname       = "spin_retry",
764                 .data           = &spin_retry,
765                 .maxlen         = sizeof (int),
766                 .mode           = 0644,
767                 .proc_handler   = proc_dointvec,
768         },
769 #endif
770 #if     defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
771         {
772                 .procname       = "acpi_video_flags",
773                 .data           = &acpi_realmode_flags,
774                 .maxlen         = sizeof (unsigned long),
775                 .mode           = 0644,
776                 .proc_handler   = proc_doulongvec_minmax,
777         },
778 #endif
779 #ifdef CONFIG_IA64
780         {
781                 .procname       = "ignore-unaligned-usertrap",
782                 .data           = &no_unaligned_warning,
783                 .maxlen         = sizeof (int),
784                 .mode           = 0644,
785                 .proc_handler   = proc_dointvec,
786         },
787         {
788                 .procname       = "unaligned-dump-stack",
789                 .data           = &unaligned_dump_stack,
790                 .maxlen         = sizeof (int),
791                 .mode           = 0644,
792                 .proc_handler   = proc_dointvec,
793         },
794 #endif
795 #ifdef CONFIG_DETECT_SOFTLOCKUP
796         {
797                 .procname       = "softlockup_panic",
798                 .data           = &softlockup_panic,
799                 .maxlen         = sizeof(int),
800                 .mode           = 0644,
801                 .proc_handler   = proc_dointvec_minmax,
802                 .extra1         = &zero,
803                 .extra2         = &one,
804         },
805         {
806                 .procname       = "softlockup_thresh",
807                 .data           = &softlockup_thresh,
808                 .maxlen         = sizeof(int),
809                 .mode           = 0644,
810                 .proc_handler   = proc_dosoftlockup_thresh,
811                 .extra1         = &neg_one,
812                 .extra2         = &sixty,
813         },
814 #endif
815 #ifdef CONFIG_DETECT_HUNG_TASK
816         {
817                 .procname       = "hung_task_panic",
818                 .data           = &sysctl_hung_task_panic,
819                 .maxlen         = sizeof(int),
820                 .mode           = 0644,
821                 .proc_handler   = proc_dointvec_minmax,
822                 .extra1         = &zero,
823                 .extra2         = &one,
824         },
825         {
826                 .procname       = "hung_task_check_count",
827                 .data           = &sysctl_hung_task_check_count,
828                 .maxlen         = sizeof(unsigned long),
829                 .mode           = 0644,
830                 .proc_handler   = proc_doulongvec_minmax,
831         },
832         {
833                 .procname       = "hung_task_timeout_secs",
834                 .data           = &sysctl_hung_task_timeout_secs,
835                 .maxlen         = sizeof(unsigned long),
836                 .mode           = 0644,
837                 .proc_handler   = proc_dohung_task_timeout_secs,
838         },
839         {
840                 .procname       = "hung_task_warnings",
841                 .data           = &sysctl_hung_task_warnings,
842                 .maxlen         = sizeof(unsigned long),
843                 .mode           = 0644,
844                 .proc_handler   = proc_doulongvec_minmax,
845         },
846 #endif
847 #ifdef CONFIG_COMPAT
848         {
849                 .procname       = "compat-log",
850                 .data           = &compat_log,
851                 .maxlen         = sizeof (int),
852                 .mode           = 0644,
853                 .proc_handler   = proc_dointvec,
854         },
855 #endif
856 #ifdef CONFIG_RT_MUTEXES
857         {
858                 .procname       = "max_lock_depth",
859                 .data           = &max_lock_depth,
860                 .maxlen         = sizeof(int),
861                 .mode           = 0644,
862                 .proc_handler   = proc_dointvec,
863         },
864 #endif
865         {
866                 .procname       = "poweroff_cmd",
867                 .data           = &poweroff_cmd,
868                 .maxlen         = POWEROFF_CMD_PATH_LEN,
869                 .mode           = 0644,
870                 .proc_handler   = proc_dostring,
871         },
872 #ifdef CONFIG_KEYS
873         {
874                 .procname       = "keys",
875                 .mode           = 0555,
876                 .child          = key_sysctls,
877         },
878 #endif
879 #ifdef CONFIG_RCU_TORTURE_TEST
880         {
881                 .procname       = "rcutorture_runnable",
882                 .data           = &rcutorture_runnable,
883                 .maxlen         = sizeof(int),
884                 .mode           = 0644,
885                 .proc_handler   = proc_dointvec,
886         },
887 #endif
888 #ifdef CONFIG_SLOW_WORK
889         {
890                 .procname       = "slow-work",
891                 .mode           = 0555,
892                 .child          = slow_work_sysctls,
893         },
894 #endif
895 #ifdef CONFIG_PERF_EVENTS
896         {
897                 .procname       = "perf_event_paranoid",
898                 .data           = &sysctl_perf_event_paranoid,
899                 .maxlen         = sizeof(sysctl_perf_event_paranoid),
900                 .mode           = 0644,
901                 .proc_handler   = proc_dointvec,
902         },
903         {
904                 .procname       = "perf_event_mlock_kb",
905                 .data           = &sysctl_perf_event_mlock,
906                 .maxlen         = sizeof(sysctl_perf_event_mlock),
907                 .mode           = 0644,
908                 .proc_handler   = proc_dointvec,
909         },
910         {
911                 .procname       = "perf_event_max_sample_rate",
912                 .data           = &sysctl_perf_event_sample_rate,
913                 .maxlen         = sizeof(sysctl_perf_event_sample_rate),
914                 .mode           = 0644,
915                 .proc_handler   = proc_dointvec,
916         },
917 #endif
918 #ifdef CONFIG_KMEMCHECK
919         {
920                 .procname       = "kmemcheck",
921                 .data           = &kmemcheck_enabled,
922                 .maxlen         = sizeof(int),
923                 .mode           = 0644,
924                 .proc_handler   = proc_dointvec,
925         },
926 #endif
927 #ifdef CONFIG_BLOCK
928         {
929                 .procname       = "blk_iopoll",
930                 .data           = &blk_iopoll_enabled,
931                 .maxlen         = sizeof(int),
932                 .mode           = 0644,
933                 .proc_handler   = proc_dointvec,
934         },
935 #endif
936 /*
937  * NOTE: do not add new entries to this table unless you have read
938  * Documentation/sysctl/ctl_unnumbered.txt
939  */
940         { }
941 };
942
943 static struct ctl_table vm_table[] = {
944         {
945                 .procname       = "overcommit_memory",
946                 .data           = &sysctl_overcommit_memory,
947                 .maxlen         = sizeof(sysctl_overcommit_memory),
948                 .mode           = 0644,
949                 .proc_handler   = proc_dointvec,
950         },
951         {
952                 .procname       = "panic_on_oom",
953                 .data           = &sysctl_panic_on_oom,
954                 .maxlen         = sizeof(sysctl_panic_on_oom),
955                 .mode           = 0644,
956                 .proc_handler   = proc_dointvec,
957         },
958         {
959                 .procname       = "oom_kill_allocating_task",
960                 .data           = &sysctl_oom_kill_allocating_task,
961                 .maxlen         = sizeof(sysctl_oom_kill_allocating_task),
962                 .mode           = 0644,
963                 .proc_handler   = proc_dointvec,
964         },
965         {
966                 .procname       = "oom_dump_tasks",
967                 .data           = &sysctl_oom_dump_tasks,
968                 .maxlen         = sizeof(sysctl_oom_dump_tasks),
969                 .mode           = 0644,
970                 .proc_handler   = proc_dointvec,
971         },
972         {
973                 .procname       = "overcommit_ratio",
974                 .data           = &sysctl_overcommit_ratio,
975                 .maxlen         = sizeof(sysctl_overcommit_ratio),
976                 .mode           = 0644,
977                 .proc_handler   = proc_dointvec,
978         },
979         {
980                 .procname       = "page-cluster", 
981                 .data           = &page_cluster,
982                 .maxlen         = sizeof(int),
983                 .mode           = 0644,
984                 .proc_handler   = proc_dointvec,
985         },
986         {
987                 .procname       = "dirty_background_ratio",
988                 .data           = &dirty_background_ratio,
989                 .maxlen         = sizeof(dirty_background_ratio),
990                 .mode           = 0644,
991                 .proc_handler   = dirty_background_ratio_handler,
992                 .extra1         = &zero,
993                 .extra2         = &one_hundred,
994         },
995         {
996                 .procname       = "dirty_background_bytes",
997                 .data           = &dirty_background_bytes,
998                 .maxlen         = sizeof(dirty_background_bytes),
999                 .mode           = 0644,
1000                 .proc_handler   = dirty_background_bytes_handler,
1001                 .extra1         = &one_ul,
1002         },
1003         {
1004                 .procname       = "dirty_ratio",
1005                 .data           = &vm_dirty_ratio,
1006                 .maxlen         = sizeof(vm_dirty_ratio),
1007                 .mode           = 0644,
1008                 .proc_handler   = dirty_ratio_handler,
1009                 .extra1         = &zero,
1010                 .extra2         = &one_hundred,
1011         },
1012         {
1013                 .procname       = "dirty_bytes",
1014                 .data           = &vm_dirty_bytes,
1015                 .maxlen         = sizeof(vm_dirty_bytes),
1016                 .mode           = 0644,
1017                 .proc_handler   = dirty_bytes_handler,
1018                 .extra1         = &dirty_bytes_min,
1019         },
1020         {
1021                 .procname       = "dirty_writeback_centisecs",
1022                 .data           = &dirty_writeback_interval,
1023                 .maxlen         = sizeof(dirty_writeback_interval),
1024                 .mode           = 0644,
1025                 .proc_handler   = dirty_writeback_centisecs_handler,
1026         },
1027         {
1028                 .procname       = "dirty_expire_centisecs",
1029                 .data           = &dirty_expire_interval,
1030                 .maxlen         = sizeof(dirty_expire_interval),
1031                 .mode           = 0644,
1032                 .proc_handler   = proc_dointvec,
1033         },
1034         {
1035                 .procname       = "nr_pdflush_threads",
1036                 .data           = &nr_pdflush_threads,
1037                 .maxlen         = sizeof nr_pdflush_threads,
1038                 .mode           = 0444 /* read-only*/,
1039                 .proc_handler   = proc_dointvec,
1040         },
1041         {
1042                 .procname       = "swappiness",
1043                 .data           = &vm_swappiness,
1044                 .maxlen         = sizeof(vm_swappiness),
1045                 .mode           = 0644,
1046                 .proc_handler   = proc_dointvec_minmax,
1047                 .extra1         = &zero,
1048                 .extra2         = &one_hundred,
1049         },
1050 #ifdef CONFIG_HUGETLB_PAGE
1051         {
1052                 .procname       = "nr_hugepages",
1053                 .data           = NULL,
1054                 .maxlen         = sizeof(unsigned long),
1055                 .mode           = 0644,
1056                 .proc_handler   = hugetlb_sysctl_handler,
1057                 .extra1         = (void *)&hugetlb_zero,
1058                 .extra2         = (void *)&hugetlb_infinity,
1059         },
1060 #ifdef CONFIG_NUMA
1061         {
1062                 .procname       = "nr_hugepages_mempolicy",
1063                 .data           = NULL,
1064                 .maxlen         = sizeof(unsigned long),
1065                 .mode           = 0644,
1066                 .proc_handler   = &hugetlb_mempolicy_sysctl_handler,
1067                 .extra1         = (void *)&hugetlb_zero,
1068                 .extra2         = (void *)&hugetlb_infinity,
1069         },
1070 #endif
1071          {
1072                 .procname       = "hugetlb_shm_group",
1073                 .data           = &sysctl_hugetlb_shm_group,
1074                 .maxlen         = sizeof(gid_t),
1075                 .mode           = 0644,
1076                 .proc_handler   = proc_dointvec,
1077          },
1078          {
1079                 .procname       = "hugepages_treat_as_movable",
1080                 .data           = &hugepages_treat_as_movable,
1081                 .maxlen         = sizeof(int),
1082                 .mode           = 0644,
1083                 .proc_handler   = hugetlb_treat_movable_handler,
1084         },
1085         {
1086                 .procname       = "nr_overcommit_hugepages",
1087                 .data           = NULL,
1088                 .maxlen         = sizeof(unsigned long),
1089                 .mode           = 0644,
1090                 .proc_handler   = hugetlb_overcommit_handler,
1091                 .extra1         = (void *)&hugetlb_zero,
1092                 .extra2         = (void *)&hugetlb_infinity,
1093         },
1094 #endif
1095         {
1096                 .procname       = "lowmem_reserve_ratio",
1097                 .data           = &sysctl_lowmem_reserve_ratio,
1098                 .maxlen         = sizeof(sysctl_lowmem_reserve_ratio),
1099                 .mode           = 0644,
1100                 .proc_handler   = lowmem_reserve_ratio_sysctl_handler,
1101         },
1102         {
1103                 .procname       = "drop_caches",
1104                 .data           = &sysctl_drop_caches,
1105                 .maxlen         = sizeof(int),
1106                 .mode           = 0644,
1107                 .proc_handler   = drop_caches_sysctl_handler,
1108         },
1109         {
1110                 .procname       = "min_free_kbytes",
1111                 .data           = &min_free_kbytes,
1112                 .maxlen         = sizeof(min_free_kbytes),
1113                 .mode           = 0644,
1114                 .proc_handler   = min_free_kbytes_sysctl_handler,
1115                 .extra1         = &zero,
1116         },
1117         {
1118                 .procname       = "percpu_pagelist_fraction",
1119                 .data           = &percpu_pagelist_fraction,
1120                 .maxlen         = sizeof(percpu_pagelist_fraction),
1121                 .mode           = 0644,
1122                 .proc_handler   = percpu_pagelist_fraction_sysctl_handler,
1123                 .extra1         = &min_percpu_pagelist_fract,
1124         },
1125 #ifdef CONFIG_MMU
1126         {
1127                 .procname       = "max_map_count",
1128                 .data           = &sysctl_max_map_count,
1129                 .maxlen         = sizeof(sysctl_max_map_count),
1130                 .mode           = 0644,
1131                 .proc_handler   = proc_dointvec_minmax,
1132                 .extra1         = &zero,
1133         },
1134 #else
1135         {
1136                 .procname       = "nr_trim_pages",
1137                 .data           = &sysctl_nr_trim_pages,
1138                 .maxlen         = sizeof(sysctl_nr_trim_pages),
1139                 .mode           = 0644,
1140                 .proc_handler   = proc_dointvec_minmax,
1141                 .extra1         = &zero,
1142         },
1143 #endif
1144         {
1145                 .procname       = "laptop_mode",
1146                 .data           = &laptop_mode,
1147                 .maxlen         = sizeof(laptop_mode),
1148                 .mode           = 0644,
1149                 .proc_handler   = proc_dointvec_jiffies,
1150         },
1151         {
1152                 .procname       = "block_dump",
1153                 .data           = &block_dump,
1154                 .maxlen         = sizeof(block_dump),
1155                 .mode           = 0644,
1156                 .proc_handler   = proc_dointvec,
1157                 .extra1         = &zero,
1158         },
1159         {
1160                 .procname       = "vfs_cache_pressure",
1161                 .data           = &sysctl_vfs_cache_pressure,
1162                 .maxlen         = sizeof(sysctl_vfs_cache_pressure),
1163                 .mode           = 0644,
1164                 .proc_handler   = proc_dointvec,
1165                 .extra1         = &zero,
1166         },
1167 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1168         {
1169                 .procname       = "legacy_va_layout",
1170                 .data           = &sysctl_legacy_va_layout,
1171                 .maxlen         = sizeof(sysctl_legacy_va_layout),
1172                 .mode           = 0644,
1173                 .proc_handler   = proc_dointvec,
1174                 .extra1         = &zero,
1175         },
1176 #endif
1177 #ifdef CONFIG_NUMA
1178         {
1179                 .procname       = "zone_reclaim_mode",
1180                 .data           = &zone_reclaim_mode,
1181                 .maxlen         = sizeof(zone_reclaim_mode),
1182                 .mode           = 0644,
1183                 .proc_handler   = proc_dointvec,
1184                 .extra1         = &zero,
1185         },
1186         {
1187                 .procname       = "min_unmapped_ratio",
1188                 .data           = &sysctl_min_unmapped_ratio,
1189                 .maxlen         = sizeof(sysctl_min_unmapped_ratio),
1190                 .mode           = 0644,
1191                 .proc_handler   = sysctl_min_unmapped_ratio_sysctl_handler,
1192                 .extra1         = &zero,
1193                 .extra2         = &one_hundred,
1194         },
1195         {
1196                 .procname       = "min_slab_ratio",
1197                 .data           = &sysctl_min_slab_ratio,
1198                 .maxlen         = sizeof(sysctl_min_slab_ratio),
1199                 .mode           = 0644,
1200                 .proc_handler   = sysctl_min_slab_ratio_sysctl_handler,
1201                 .extra1         = &zero,
1202                 .extra2         = &one_hundred,
1203         },
1204 #endif
1205 #ifdef CONFIG_SMP
1206         {
1207                 .procname       = "stat_interval",
1208                 .data           = &sysctl_stat_interval,
1209                 .maxlen         = sizeof(sysctl_stat_interval),
1210                 .mode           = 0644,
1211                 .proc_handler   = proc_dointvec_jiffies,
1212         },
1213 #endif
1214 #ifdef CONFIG_MMU
1215         {
1216                 .procname       = "mmap_min_addr",
1217                 .data           = &dac_mmap_min_addr,
1218                 .maxlen         = sizeof(unsigned long),
1219                 .mode           = 0644,
1220                 .proc_handler   = mmap_min_addr_handler,
1221         },
1222 #endif
1223 #ifdef CONFIG_NUMA
1224         {
1225                 .procname       = "numa_zonelist_order",
1226                 .data           = &numa_zonelist_order,
1227                 .maxlen         = NUMA_ZONELIST_ORDER_LEN,
1228                 .mode           = 0644,
1229                 .proc_handler   = numa_zonelist_order_handler,
1230         },
1231 #endif
1232 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1233    (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1234         {
1235                 .procname       = "vdso_enabled",
1236                 .data           = &vdso_enabled,
1237                 .maxlen         = sizeof(vdso_enabled),
1238                 .mode           = 0644,
1239                 .proc_handler   = proc_dointvec,
1240                 .extra1         = &zero,
1241         },
1242 #endif
1243 #ifdef CONFIG_HIGHMEM
1244         {
1245                 .procname       = "highmem_is_dirtyable",
1246                 .data           = &vm_highmem_is_dirtyable,
1247                 .maxlen         = sizeof(vm_highmem_is_dirtyable),
1248                 .mode           = 0644,
1249                 .proc_handler   = proc_dointvec_minmax,
1250                 .extra1         = &zero,
1251                 .extra2         = &one,
1252         },
1253 #endif
1254         {
1255                 .procname       = "scan_unevictable_pages",
1256                 .data           = &scan_unevictable_pages,
1257                 .maxlen         = sizeof(scan_unevictable_pages),
1258                 .mode           = 0644,
1259                 .proc_handler   = scan_unevictable_handler,
1260         },
1261 #ifdef CONFIG_MEMORY_FAILURE
1262         {
1263                 .procname       = "memory_failure_early_kill",
1264                 .data           = &sysctl_memory_failure_early_kill,
1265                 .maxlen         = sizeof(sysctl_memory_failure_early_kill),
1266                 .mode           = 0644,
1267                 .proc_handler   = proc_dointvec_minmax,
1268                 .extra1         = &zero,
1269                 .extra2         = &one,
1270         },
1271         {
1272                 .procname       = "memory_failure_recovery",
1273                 .data           = &sysctl_memory_failure_recovery,
1274                 .maxlen         = sizeof(sysctl_memory_failure_recovery),
1275                 .mode           = 0644,
1276                 .proc_handler   = proc_dointvec_minmax,
1277                 .extra1         = &zero,
1278                 .extra2         = &one,
1279         },
1280 #endif
1281
1282 /*
1283  * NOTE: do not add new entries to this table unless you have read
1284  * Documentation/sysctl/ctl_unnumbered.txt
1285  */
1286         { }
1287 };
1288
1289 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1290 static struct ctl_table binfmt_misc_table[] = {
1291         { }
1292 };
1293 #endif
1294
1295 static struct ctl_table fs_table[] = {
1296         {
1297                 .procname       = "inode-nr",
1298                 .data           = &inodes_stat,
1299                 .maxlen         = 2*sizeof(int),
1300                 .mode           = 0444,
1301                 .proc_handler   = proc_dointvec,
1302         },
1303         {
1304                 .procname       = "inode-state",
1305                 .data           = &inodes_stat,
1306                 .maxlen         = 7*sizeof(int),
1307                 .mode           = 0444,
1308                 .proc_handler   = proc_dointvec,
1309         },
1310         {
1311                 .procname       = "file-nr",
1312                 .data           = &files_stat,
1313                 .maxlen         = 3*sizeof(int),
1314                 .mode           = 0444,
1315                 .proc_handler   = proc_nr_files,
1316         },
1317         {
1318                 .procname       = "file-max",
1319                 .data           = &files_stat.max_files,
1320                 .maxlen         = sizeof(int),
1321                 .mode           = 0644,
1322                 .proc_handler   = proc_dointvec,
1323         },
1324         {
1325                 .procname       = "nr_open",
1326                 .data           = &sysctl_nr_open,
1327                 .maxlen         = sizeof(int),
1328                 .mode           = 0644,
1329                 .proc_handler   = proc_dointvec_minmax,
1330                 .extra1         = &sysctl_nr_open_min,
1331                 .extra2         = &sysctl_nr_open_max,
1332         },
1333         {
1334                 .procname       = "dentry-state",
1335                 .data           = &dentry_stat,
1336                 .maxlen         = 6*sizeof(int),
1337                 .mode           = 0444,
1338                 .proc_handler   = proc_dointvec,
1339         },
1340         {
1341                 .procname       = "overflowuid",
1342                 .data           = &fs_overflowuid,
1343                 .maxlen         = sizeof(int),
1344                 .mode           = 0644,
1345                 .proc_handler   = proc_dointvec_minmax,
1346                 .extra1         = &minolduid,
1347                 .extra2         = &maxolduid,
1348         },
1349         {
1350                 .procname       = "overflowgid",
1351                 .data           = &fs_overflowgid,
1352                 .maxlen         = sizeof(int),
1353                 .mode           = 0644,
1354                 .proc_handler   = proc_dointvec_minmax,
1355                 .extra1         = &minolduid,
1356                 .extra2         = &maxolduid,
1357         },
1358 #ifdef CONFIG_FILE_LOCKING
1359         {
1360                 .procname       = "leases-enable",
1361                 .data           = &leases_enable,
1362                 .maxlen         = sizeof(int),
1363                 .mode           = 0644,
1364                 .proc_handler   = proc_dointvec,
1365         },
1366 #endif
1367 #ifdef CONFIG_DNOTIFY
1368         {
1369                 .procname       = "dir-notify-enable",
1370                 .data           = &dir_notify_enable,
1371                 .maxlen         = sizeof(int),
1372                 .mode           = 0644,
1373                 .proc_handler   = proc_dointvec,
1374         },
1375 #endif
1376 #ifdef CONFIG_MMU
1377 #ifdef CONFIG_FILE_LOCKING
1378         {
1379                 .procname       = "lease-break-time",
1380                 .data           = &lease_break_time,
1381                 .maxlen         = sizeof(int),
1382                 .mode           = 0644,
1383                 .proc_handler   = proc_dointvec,
1384         },
1385 #endif
1386 #ifdef CONFIG_AIO
1387         {
1388                 .procname       = "aio-nr",
1389                 .data           = &aio_nr,
1390                 .maxlen         = sizeof(aio_nr),
1391                 .mode           = 0444,
1392                 .proc_handler   = proc_doulongvec_minmax,
1393         },
1394         {
1395                 .procname       = "aio-max-nr",
1396                 .data           = &aio_max_nr,
1397                 .maxlen         = sizeof(aio_max_nr),
1398                 .mode           = 0644,
1399                 .proc_handler   = proc_doulongvec_minmax,
1400         },
1401 #endif /* CONFIG_AIO */
1402 #ifdef CONFIG_INOTIFY_USER
1403         {
1404                 .procname       = "inotify",
1405                 .mode           = 0555,
1406                 .child          = inotify_table,
1407         },
1408 #endif  
1409 #ifdef CONFIG_EPOLL
1410         {
1411                 .procname       = "epoll",
1412                 .mode           = 0555,
1413                 .child          = epoll_table,
1414         },
1415 #endif
1416 #endif
1417         {
1418                 .procname       = "suid_dumpable",
1419                 .data           = &suid_dumpable,
1420                 .maxlen         = sizeof(int),
1421                 .mode           = 0644,
1422                 .proc_handler   = proc_dointvec_minmax,
1423                 .extra1         = &zero,
1424                 .extra2         = &two,
1425         },
1426 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1427         {
1428                 .procname       = "binfmt_misc",
1429                 .mode           = 0555,
1430                 .child          = binfmt_misc_table,
1431         },
1432 #endif
1433 /*
1434  * NOTE: do not add new entries to this table unless you have read
1435  * Documentation/sysctl/ctl_unnumbered.txt
1436  */
1437         { }
1438 };
1439
1440 static struct ctl_table debug_table[] = {
1441 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_SPARC)
1442         {
1443                 .procname       = "exception-trace",
1444                 .data           = &show_unhandled_signals,
1445                 .maxlen         = sizeof(int),
1446                 .mode           = 0644,
1447                 .proc_handler   = proc_dointvec
1448         },
1449 #endif
1450 #if defined(CONFIG_OPTPROBES)
1451         {
1452                 .procname       = "kprobes-optimization",
1453                 .data           = &sysctl_kprobes_optimization,
1454                 .maxlen         = sizeof(int),
1455                 .mode           = 0644,
1456                 .proc_handler   = proc_kprobes_optimization_handler,
1457                 .extra1         = &zero,
1458                 .extra2         = &one,
1459         },
1460 #endif
1461         { }
1462 };
1463
1464 static struct ctl_table dev_table[] = {
1465         { }
1466 };
1467
1468 static DEFINE_SPINLOCK(sysctl_lock);
1469
1470 /* called under sysctl_lock */
1471 static int use_table(struct ctl_table_header *p)
1472 {
1473         if (unlikely(p->unregistering))
1474                 return 0;
1475         p->used++;
1476         return 1;
1477 }
1478
1479 /* called under sysctl_lock */
1480 static void unuse_table(struct ctl_table_header *p)
1481 {
1482         if (!--p->used)
1483                 if (unlikely(p->unregistering))
1484                         complete(p->unregistering);
1485 }
1486
1487 /* called under sysctl_lock, will reacquire if has to wait */
1488 static void start_unregistering(struct ctl_table_header *p)
1489 {
1490         /*
1491          * if p->used is 0, nobody will ever touch that entry again;
1492          * we'll eliminate all paths to it before dropping sysctl_lock
1493          */
1494         if (unlikely(p->used)) {
1495                 struct completion wait;
1496                 init_completion(&wait);
1497                 p->unregistering = &wait;
1498                 spin_unlock(&sysctl_lock);
1499                 wait_for_completion(&wait);
1500                 spin_lock(&sysctl_lock);
1501         } else {
1502                 /* anything non-NULL; we'll never dereference it */
1503                 p->unregistering = ERR_PTR(-EINVAL);
1504         }
1505         /*
1506          * do not remove from the list until nobody holds it; walking the
1507          * list in do_sysctl() relies on that.
1508          */
1509         list_del_init(&p->ctl_entry);
1510 }
1511
1512 void sysctl_head_get(struct ctl_table_header *head)
1513 {
1514         spin_lock(&sysctl_lock);
1515         head->count++;
1516         spin_unlock(&sysctl_lock);
1517 }
1518
1519 void sysctl_head_put(struct ctl_table_header *head)
1520 {
1521         spin_lock(&sysctl_lock);
1522         if (!--head->count)
1523                 kfree(head);
1524         spin_unlock(&sysctl_lock);
1525 }
1526
1527 struct ctl_table_header *sysctl_head_grab(struct ctl_table_header *head)
1528 {
1529         if (!head)
1530                 BUG();
1531         spin_lock(&sysctl_lock);
1532         if (!use_table(head))
1533                 head = ERR_PTR(-ENOENT);
1534         spin_unlock(&sysctl_lock);
1535         return head;
1536 }
1537
1538 void sysctl_head_finish(struct ctl_table_header *head)
1539 {
1540         if (!head)
1541                 return;
1542         spin_lock(&sysctl_lock);
1543         unuse_table(head);
1544         spin_unlock(&sysctl_lock);
1545 }
1546
1547 static struct ctl_table_set *
1548 lookup_header_set(struct ctl_table_root *root, struct nsproxy *namespaces)
1549 {
1550         struct ctl_table_set *set = &root->default_set;
1551         if (root->lookup)
1552                 set = root->lookup(root, namespaces);
1553         return set;
1554 }
1555
1556 static struct list_head *
1557 lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces)
1558 {
1559         struct ctl_table_set *set = lookup_header_set(root, namespaces);
1560         return &set->list;
1561 }
1562
1563 struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces,
1564                                             struct ctl_table_header *prev)
1565 {
1566         struct ctl_table_root *root;
1567         struct list_head *header_list;
1568         struct ctl_table_header *head;
1569         struct list_head *tmp;
1570
1571         spin_lock(&sysctl_lock);
1572         if (prev) {
1573                 head = prev;
1574                 tmp = &prev->ctl_entry;
1575                 unuse_table(prev);
1576                 goto next;
1577         }
1578         tmp = &root_table_header.ctl_entry;
1579         for (;;) {
1580                 head = list_entry(tmp, struct ctl_table_header, ctl_entry);
1581
1582                 if (!use_table(head))
1583                         goto next;
1584                 spin_unlock(&sysctl_lock);
1585                 return head;
1586         next:
1587                 root = head->root;
1588                 tmp = tmp->next;
1589                 header_list = lookup_header_list(root, namespaces);
1590                 if (tmp != header_list)
1591                         continue;
1592
1593                 do {
1594                         root = list_entry(root->root_list.next,
1595                                         struct ctl_table_root, root_list);
1596                         if (root == &sysctl_table_root)
1597                                 goto out;
1598                         header_list = lookup_header_list(root, namespaces);
1599                 } while (list_empty(header_list));
1600                 tmp = header_list->next;
1601         }
1602 out:
1603         spin_unlock(&sysctl_lock);
1604         return NULL;
1605 }
1606
1607 struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev)
1608 {
1609         return __sysctl_head_next(current->nsproxy, prev);
1610 }
1611
1612 void register_sysctl_root(struct ctl_table_root *root)
1613 {
1614         spin_lock(&sysctl_lock);
1615         list_add_tail(&root->root_list, &sysctl_table_root.root_list);
1616         spin_unlock(&sysctl_lock);
1617 }
1618
1619 /*
1620  * sysctl_perm does NOT grant the superuser all rights automatically, because
1621  * some sysctl variables are readonly even to root.
1622  */
1623
1624 static int test_perm(int mode, int op)
1625 {
1626         if (!current_euid())
1627                 mode >>= 6;
1628         else if (in_egroup_p(0))
1629                 mode >>= 3;
1630         if ((op & ~mode & (MAY_READ|MAY_WRITE|MAY_EXEC)) == 0)
1631                 return 0;
1632         return -EACCES;
1633 }
1634
1635 int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op)
1636 {
1637         int error;
1638         int mode;
1639
1640         error = security_sysctl(table, op & (MAY_READ | MAY_WRITE | MAY_EXEC));
1641         if (error)
1642                 return error;
1643
1644         if (root->permissions)
1645                 mode = root->permissions(root, current->nsproxy, table);
1646         else
1647                 mode = table->mode;
1648
1649         return test_perm(mode, op);
1650 }
1651
1652 static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table)
1653 {
1654         for (; table->procname; table++) {
1655                 table->parent = parent;
1656                 if (table->child)
1657                         sysctl_set_parent(table, table->child);
1658         }
1659 }
1660
1661 static __init int sysctl_init(void)
1662 {
1663         sysctl_set_parent(NULL, root_table);
1664 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1665         {
1666                 int err;
1667                 err = sysctl_check_table(current->nsproxy, root_table);
1668         }
1669 #endif
1670         return 0;
1671 }
1672
1673 core_initcall(sysctl_init);
1674
1675 static struct ctl_table *is_branch_in(struct ctl_table *branch,
1676                                       struct ctl_table *table)
1677 {
1678         struct ctl_table *p;
1679         const char *s = branch->procname;
1680
1681         /* branch should have named subdirectory as its first element */
1682         if (!s || !branch->child)
1683                 return NULL;
1684
1685         /* ... and nothing else */
1686         if (branch[1].procname)
1687                 return NULL;
1688
1689         /* table should contain subdirectory with the same name */
1690         for (p = table; p->procname; p++) {
1691                 if (!p->child)
1692                         continue;
1693                 if (p->procname && strcmp(p->procname, s) == 0)
1694                         return p;
1695         }
1696         return NULL;
1697 }
1698
1699 /* see if attaching q to p would be an improvement */
1700 static void try_attach(struct ctl_table_header *p, struct ctl_table_header *q)
1701 {
1702         struct ctl_table *to = p->ctl_table, *by = q->ctl_table;
1703         struct ctl_table *next;
1704         int is_better = 0;
1705         int not_in_parent = !p->attached_by;
1706
1707         while ((next = is_branch_in(by, to)) != NULL) {
1708                 if (by == q->attached_by)
1709                         is_better = 1;
1710                 if (to == p->attached_by)
1711                         not_in_parent = 1;
1712                 by = by->child;
1713                 to = next->child;
1714         }
1715
1716         if (is_better && not_in_parent) {
1717                 q->attached_by = by;
1718                 q->attached_to = to;
1719                 q->parent = p;
1720         }
1721 }
1722
1723 /**
1724  * __register_sysctl_paths - register a sysctl hierarchy
1725  * @root: List of sysctl headers to register on
1726  * @namespaces: Data to compute which lists of sysctl entries are visible
1727  * @path: The path to the directory the sysctl table is in.
1728  * @table: the top-level table structure
1729  *
1730  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1731  * array. A completely 0 filled entry terminates the table.
1732  *
1733  * The members of the &struct ctl_table structure are used as follows:
1734  *
1735  * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1736  *            enter a sysctl file
1737  *
1738  * data - a pointer to data for use by proc_handler
1739  *
1740  * maxlen - the maximum size in bytes of the data
1741  *
1742  * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1743  *
1744  * child - a pointer to the child sysctl table if this entry is a directory, or
1745  *         %NULL.
1746  *
1747  * proc_handler - the text handler routine (described below)
1748  *
1749  * de - for internal use by the sysctl routines
1750  *
1751  * extra1, extra2 - extra pointers usable by the proc handler routines
1752  *
1753  * Leaf nodes in the sysctl tree will be represented by a single file
1754  * under /proc; non-leaf nodes will be represented by directories.
1755  *
1756  * sysctl(2) can automatically manage read and write requests through
1757  * the sysctl table.  The data and maxlen fields of the ctl_table
1758  * struct enable minimal validation of the values being written to be
1759  * performed, and the mode field allows minimal authentication.
1760  *
1761  * There must be a proc_handler routine for any terminal nodes
1762  * mirrored under /proc/sys (non-terminals are handled by a built-in
1763  * directory handler).  Several default handlers are available to
1764  * cover common cases -
1765  *
1766  * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1767  * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(), 
1768  * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1769  *
1770  * It is the handler's job to read the input buffer from user memory
1771  * and process it. The handler should return 0 on success.
1772  *
1773  * This routine returns %NULL on a failure to register, and a pointer
1774  * to the table header on success.
1775  */
1776 struct ctl_table_header *__register_sysctl_paths(
1777         struct ctl_table_root *root,
1778         struct nsproxy *namespaces,
1779         const struct ctl_path *path, struct ctl_table *table)
1780 {
1781         struct ctl_table_header *header;
1782         struct ctl_table *new, **prevp;
1783         unsigned int n, npath;
1784         struct ctl_table_set *set;
1785
1786         /* Count the path components */
1787         for (npath = 0; path[npath].procname; ++npath)
1788                 ;
1789
1790         /*
1791          * For each path component, allocate a 2-element ctl_table array.
1792          * The first array element will be filled with the sysctl entry
1793          * for this, the second will be the sentinel (procname == 0).
1794          *
1795          * We allocate everything in one go so that we don't have to
1796          * worry about freeing additional memory in unregister_sysctl_table.
1797          */
1798         header = kzalloc(sizeof(struct ctl_table_header) +
1799                          (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL);
1800         if (!header)
1801                 return NULL;
1802
1803         new = (struct ctl_table *) (header + 1);
1804
1805         /* Now connect the dots */
1806         prevp = &header->ctl_table;
1807         for (n = 0; n < npath; ++n, ++path) {
1808                 /* Copy the procname */
1809                 new->procname = path->procname;
1810                 new->mode     = 0555;
1811
1812                 *prevp = new;
1813                 prevp = &new->child;
1814
1815                 new += 2;
1816         }
1817         *prevp = table;
1818         header->ctl_table_arg = table;
1819
1820         INIT_LIST_HEAD(&header->ctl_entry);
1821         header->used = 0;
1822         header->unregistering = NULL;
1823         header->root = root;
1824         sysctl_set_parent(NULL, header->ctl_table);
1825         header->count = 1;
1826 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1827         if (sysctl_check_table(namespaces, header->ctl_table)) {
1828                 kfree(header);
1829                 return NULL;
1830         }
1831 #endif
1832         spin_lock(&sysctl_lock);
1833         header->set = lookup_header_set(root, namespaces);
1834         header->attached_by = header->ctl_table;
1835         header->attached_to = root_table;
1836         header->parent = &root_table_header;
1837         for (set = header->set; set; set = set->parent) {
1838                 struct ctl_table_header *p;
1839                 list_for_each_entry(p, &set->list, ctl_entry) {
1840                         if (p->unregistering)
1841                                 continue;
1842                         try_attach(p, header);
1843                 }
1844         }
1845         header->parent->count++;
1846         list_add_tail(&header->ctl_entry, &header->set->list);
1847         spin_unlock(&sysctl_lock);
1848
1849         return header;
1850 }
1851
1852 /**
1853  * register_sysctl_table_path - register a sysctl table hierarchy
1854  * @path: The path to the directory the sysctl table is in.
1855  * @table: the top-level table structure
1856  *
1857  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1858  * array. A completely 0 filled entry terminates the table.
1859  *
1860  * See __register_sysctl_paths for more details.
1861  */
1862 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1863                                                 struct ctl_table *table)
1864 {
1865         return __register_sysctl_paths(&sysctl_table_root, current->nsproxy,
1866                                         path, table);
1867 }
1868
1869 /**
1870  * register_sysctl_table - register a sysctl table hierarchy
1871  * @table: the top-level table structure
1872  *
1873  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1874  * array. A completely 0 filled entry terminates the table.
1875  *
1876  * See register_sysctl_paths for more details.
1877  */
1878 struct ctl_table_header *register_sysctl_table(struct ctl_table *table)
1879 {
1880         static const struct ctl_path null_path[] = { {} };
1881
1882         return register_sysctl_paths(null_path, table);
1883 }
1884
1885 /**
1886  * unregister_sysctl_table - unregister a sysctl table hierarchy
1887  * @header: the header returned from register_sysctl_table
1888  *
1889  * Unregisters the sysctl table and all children. proc entries may not
1890  * actually be removed until they are no longer used by anyone.
1891  */
1892 void unregister_sysctl_table(struct ctl_table_header * header)
1893 {
1894         might_sleep();
1895
1896         if (header == NULL)
1897                 return;
1898
1899         spin_lock(&sysctl_lock);
1900         start_unregistering(header);
1901         if (!--header->parent->count) {
1902                 WARN_ON(1);
1903                 kfree(header->parent);
1904         }
1905         if (!--header->count)
1906                 kfree(header);
1907         spin_unlock(&sysctl_lock);
1908 }
1909
1910 int sysctl_is_seen(struct ctl_table_header *p)
1911 {
1912         struct ctl_table_set *set = p->set;
1913         int res;
1914         spin_lock(&sysctl_lock);
1915         if (p->unregistering)
1916                 res = 0;
1917         else if (!set->is_seen)
1918                 res = 1;
1919         else
1920                 res = set->is_seen(set);
1921         spin_unlock(&sysctl_lock);
1922         return res;
1923 }
1924
1925 void setup_sysctl_set(struct ctl_table_set *p,
1926         struct ctl_table_set *parent,
1927         int (*is_seen)(struct ctl_table_set *))
1928 {
1929         INIT_LIST_HEAD(&p->list);
1930         p->parent = parent ? parent : &sysctl_table_root.default_set;
1931         p->is_seen = is_seen;
1932 }
1933
1934 #else /* !CONFIG_SYSCTL */
1935 struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
1936 {
1937         return NULL;
1938 }
1939
1940 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1941                                                     struct ctl_table *table)
1942 {
1943         return NULL;
1944 }
1945
1946 void unregister_sysctl_table(struct ctl_table_header * table)
1947 {
1948 }
1949
1950 void setup_sysctl_set(struct ctl_table_set *p,
1951         struct ctl_table_set *parent,
1952         int (*is_seen)(struct ctl_table_set *))
1953 {
1954 }
1955
1956 void sysctl_head_put(struct ctl_table_header *head)
1957 {
1958 }
1959
1960 #endif /* CONFIG_SYSCTL */
1961
1962 /*
1963  * /proc/sys support
1964  */
1965
1966 #ifdef CONFIG_PROC_SYSCTL
1967
1968 static int _proc_do_string(void* data, int maxlen, int write,
1969                            void __user *buffer,
1970                            size_t *lenp, loff_t *ppos)
1971 {
1972         size_t len;
1973         char __user *p;
1974         char c;
1975
1976         if (!data || !maxlen || !*lenp) {
1977                 *lenp = 0;
1978                 return 0;
1979         }
1980
1981         if (write) {
1982                 len = 0;
1983                 p = buffer;
1984                 while (len < *lenp) {
1985                         if (get_user(c, p++))
1986                                 return -EFAULT;
1987                         if (c == 0 || c == '\n')
1988                                 break;
1989                         len++;
1990                 }
1991                 if (len >= maxlen)
1992                         len = maxlen-1;
1993                 if(copy_from_user(data, buffer, len))
1994                         return -EFAULT;
1995                 ((char *) data)[len] = 0;
1996                 *ppos += *lenp;
1997         } else {
1998                 len = strlen(data);
1999                 if (len > maxlen)
2000                         len = maxlen;
2001
2002                 if (*ppos > len) {
2003                         *lenp = 0;
2004                         return 0;
2005                 }
2006
2007                 data += *ppos;
2008                 len  -= *ppos;
2009
2010                 if (len > *lenp)
2011                         len = *lenp;
2012                 if (len)
2013                         if(copy_to_user(buffer, data, len))
2014                                 return -EFAULT;
2015                 if (len < *lenp) {
2016                         if(put_user('\n', ((char __user *) buffer) + len))
2017                                 return -EFAULT;
2018                         len++;
2019                 }
2020                 *lenp = len;
2021                 *ppos += len;
2022         }
2023         return 0;
2024 }
2025
2026 /**
2027  * proc_dostring - read a string sysctl
2028  * @table: the sysctl table
2029  * @write: %TRUE if this is a write to the sysctl file
2030  * @buffer: the user buffer
2031  * @lenp: the size of the user buffer
2032  * @ppos: file position
2033  *
2034  * Reads/writes a string from/to the user buffer. If the kernel
2035  * buffer provided is not large enough to hold the string, the
2036  * string is truncated. The copied string is %NULL-terminated.
2037  * If the string is being read by the user process, it is copied
2038  * and a newline '\n' is added. It is truncated if the buffer is
2039  * not large enough.
2040  *
2041  * Returns 0 on success.
2042  */
2043 int proc_dostring(struct ctl_table *table, int write,
2044                   void __user *buffer, size_t *lenp, loff_t *ppos)
2045 {
2046         return _proc_do_string(table->data, table->maxlen, write,
2047                                buffer, lenp, ppos);
2048 }
2049
2050
2051 static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp,
2052                                  int *valp,
2053                                  int write, void *data)
2054 {
2055         if (write) {
2056                 *valp = *negp ? -*lvalp : *lvalp;
2057         } else {
2058                 int val = *valp;
2059                 if (val < 0) {
2060                         *negp = -1;
2061                         *lvalp = (unsigned long)-val;
2062                 } else {
2063                         *negp = 0;
2064                         *lvalp = (unsigned long)val;
2065                 }
2066         }
2067         return 0;
2068 }
2069
2070 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
2071                   int write, void __user *buffer,
2072                   size_t *lenp, loff_t *ppos,
2073                   int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2074                               int write, void *data),
2075                   void *data)
2076 {
2077 #define TMPBUFLEN 21
2078         int *i, vleft, first = 1, neg;
2079         unsigned long lval;
2080         size_t left, len;
2081         
2082         char buf[TMPBUFLEN], *p;
2083         char __user *s = buffer;
2084         
2085         if (!tbl_data || !table->maxlen || !*lenp ||
2086             (*ppos && !write)) {
2087                 *lenp = 0;
2088                 return 0;
2089         }
2090         
2091         i = (int *) tbl_data;
2092         vleft = table->maxlen / sizeof(*i);
2093         left = *lenp;
2094
2095         if (!conv)
2096                 conv = do_proc_dointvec_conv;
2097
2098         for (; left && vleft--; i++, first=0) {
2099                 if (write) {
2100                         while (left) {
2101                                 char c;
2102                                 if (get_user(c, s))
2103                                         return -EFAULT;
2104                                 if (!isspace(c))
2105                                         break;
2106                                 left--;
2107                                 s++;
2108                         }
2109                         if (!left)
2110                                 break;
2111                         neg = 0;
2112                         len = left;
2113                         if (len > sizeof(buf) - 1)
2114                                 len = sizeof(buf) - 1;
2115                         if (copy_from_user(buf, s, len))
2116                                 return -EFAULT;
2117                         buf[len] = 0;
2118                         p = buf;
2119                         if (*p == '-' && left > 1) {
2120                                 neg = 1;
2121                                 p++;
2122                         }
2123                         if (*p < '0' || *p > '9')
2124                                 break;
2125
2126                         lval = simple_strtoul(p, &p, 0);
2127
2128                         len = p-buf;
2129                         if ((len < left) && *p && !isspace(*p))
2130                                 break;
2131                         s += len;
2132                         left -= len;
2133
2134                         if (conv(&neg, &lval, i, 1, data))
2135                                 break;
2136                 } else {
2137                         p = buf;
2138                         if (!first)
2139                                 *p++ = '\t';
2140         
2141                         if (conv(&neg, &lval, i, 0, data))
2142                                 break;
2143
2144                         sprintf(p, "%s%lu", neg ? "-" : "", lval);
2145                         len = strlen(buf);
2146                         if (len > left)
2147                                 len = left;
2148                         if(copy_to_user(s, buf, len))
2149                                 return -EFAULT;
2150                         left -= len;
2151                         s += len;
2152                 }
2153         }
2154
2155         if (!write && !first && left) {
2156                 if(put_user('\n', s))
2157                         return -EFAULT;
2158                 left--, s++;
2159         }
2160         if (write) {
2161                 while (left) {
2162                         char c;
2163                         if (get_user(c, s++))
2164                                 return -EFAULT;
2165                         if (!isspace(c))
2166                                 break;
2167                         left--;
2168                 }
2169         }
2170         if (write && first)
2171                 return -EINVAL;
2172         *lenp -= left;
2173         *ppos += *lenp;
2174         return 0;
2175 #undef TMPBUFLEN
2176 }
2177
2178 static int do_proc_dointvec(struct ctl_table *table, int write,
2179                   void __user *buffer, size_t *lenp, loff_t *ppos,
2180                   int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2181                               int write, void *data),
2182                   void *data)
2183 {
2184         return __do_proc_dointvec(table->data, table, write,
2185                         buffer, lenp, ppos, conv, data);
2186 }
2187
2188 /**
2189  * proc_dointvec - read a vector of integers
2190  * @table: the sysctl table
2191  * @write: %TRUE if this is a write to the sysctl file
2192  * @buffer: the user buffer
2193  * @lenp: the size of the user buffer
2194  * @ppos: file position
2195  *
2196  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2197  * values from/to the user buffer, treated as an ASCII string. 
2198  *
2199  * Returns 0 on success.
2200  */
2201 int proc_dointvec(struct ctl_table *table, int write,
2202                      void __user *buffer, size_t *lenp, loff_t *ppos)
2203 {
2204     return do_proc_dointvec(table,write,buffer,lenp,ppos,
2205                             NULL,NULL);
2206 }
2207
2208 /*
2209  * Taint values can only be increased
2210  * This means we can safely use a temporary.
2211  */
2212 static int proc_taint(struct ctl_table *table, int write,
2213                                void __user *buffer, size_t *lenp, loff_t *ppos)
2214 {
2215         struct ctl_table t;
2216         unsigned long tmptaint = get_taint();
2217         int err;
2218
2219         if (write && !capable(CAP_SYS_ADMIN))
2220                 return -EPERM;
2221
2222         t = *table;
2223         t.data = &tmptaint;
2224         err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2225         if (err < 0)
2226                 return err;
2227
2228         if (write) {
2229                 /*
2230                  * Poor man's atomic or. Not worth adding a primitive
2231                  * to everyone's atomic.h for this
2232                  */
2233                 int i;
2234                 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2235                         if ((tmptaint >> i) & 1)
2236                                 add_taint(i);
2237                 }
2238         }
2239
2240         return err;
2241 }
2242
2243 struct do_proc_dointvec_minmax_conv_param {
2244         int *min;
2245         int *max;
2246 };
2247
2248 static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp, 
2249                                         int *valp, 
2250                                         int write, void *data)
2251 {
2252         struct do_proc_dointvec_minmax_conv_param *param = data;
2253         if (write) {
2254                 int val = *negp ? -*lvalp : *lvalp;
2255                 if ((param->min && *param->min > val) ||
2256                     (param->max && *param->max < val))
2257                         return -EINVAL;
2258                 *valp = val;
2259         } else {
2260                 int val = *valp;
2261                 if (val < 0) {
2262                         *negp = -1;
2263                         *lvalp = (unsigned long)-val;
2264                 } else {
2265                         *negp = 0;
2266                         *lvalp = (unsigned long)val;
2267                 }
2268         }
2269         return 0;
2270 }
2271
2272 /**
2273  * proc_dointvec_minmax - read a vector of integers with min/max values
2274  * @table: the sysctl table
2275  * @write: %TRUE if this is a write to the sysctl file
2276  * @buffer: the user buffer
2277  * @lenp: the size of the user buffer
2278  * @ppos: file position
2279  *
2280  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2281  * values from/to the user buffer, treated as an ASCII string.
2282  *
2283  * This routine will ensure the values are within the range specified by
2284  * table->extra1 (min) and table->extra2 (max).
2285  *
2286  * Returns 0 on success.
2287  */
2288 int proc_dointvec_minmax(struct ctl_table *table, int write,
2289                   void __user *buffer, size_t *lenp, loff_t *ppos)
2290 {
2291         struct do_proc_dointvec_minmax_conv_param param = {
2292                 .min = (int *) table->extra1,
2293                 .max = (int *) table->extra2,
2294         };
2295         return do_proc_dointvec(table, write, buffer, lenp, ppos,
2296                                 do_proc_dointvec_minmax_conv, &param);
2297 }
2298
2299 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2300                                      void __user *buffer,
2301                                      size_t *lenp, loff_t *ppos,
2302                                      unsigned long convmul,
2303                                      unsigned long convdiv)
2304 {
2305 #define TMPBUFLEN 21
2306         unsigned long *i, *min, *max, val;
2307         int vleft, first=1, neg;
2308         size_t len, left;
2309         char buf[TMPBUFLEN], *p;
2310         char __user *s = buffer;
2311         
2312         if (!data || !table->maxlen || !*lenp ||
2313             (*ppos && !write)) {
2314                 *lenp = 0;
2315                 return 0;
2316         }
2317         
2318         i = (unsigned long *) data;
2319         min = (unsigned long *) table->extra1;
2320         max = (unsigned long *) table->extra2;
2321         vleft = table->maxlen / sizeof(unsigned long);
2322         left = *lenp;
2323         
2324         for (; left && vleft--; i++, min++, max++, first=0) {
2325                 if (write) {
2326                         while (left) {
2327                                 char c;
2328                                 if (get_user(c, s))
2329                                         return -EFAULT;
2330                                 if (!isspace(c))
2331                                         break;
2332                                 left--;
2333                                 s++;
2334                         }
2335                         if (!left)
2336                                 break;
2337                         neg = 0;
2338                         len = left;
2339                         if (len > TMPBUFLEN-1)
2340                                 len = TMPBUFLEN-1;
2341                         if (copy_from_user(buf, s, len))
2342                                 return -EFAULT;
2343                         buf[len] = 0;
2344                         p = buf;
2345                         if (*p == '-' && left > 1) {
2346                                 neg = 1;
2347                                 p++;
2348                         }
2349                         if (*p < '0' || *p > '9')
2350                                 break;
2351                         val = simple_strtoul(p, &p, 0) * convmul / convdiv ;
2352                         len = p-buf;
2353                         if ((len < left) && *p && !isspace(*p))
2354                                 break;
2355                         if (neg)
2356                                 val = -val;
2357                         s += len;
2358                         left -= len;
2359
2360                         if(neg)
2361                                 continue;
2362                         if ((min && val < *min) || (max && val > *max))
2363                                 continue;
2364                         *i = val;
2365                 } else {
2366                         p = buf;
2367                         if (!first)
2368                                 *p++ = '\t';
2369                         sprintf(p, "%lu", convdiv * (*i) / convmul);
2370                         len = strlen(buf);
2371                         if (len > left)
2372                                 len = left;
2373                         if(copy_to_user(s, buf, len))
2374                                 return -EFAULT;
2375                         left -= len;
2376                         s += len;
2377                 }
2378         }
2379
2380         if (!write && !first && left) {
2381                 if(put_user('\n', s))
2382                         return -EFAULT;
2383                 left--, s++;
2384         }
2385         if (write) {
2386                 while (left) {
2387                         char c;
2388                         if (get_user(c, s++))
2389                                 return -EFAULT;
2390                         if (!isspace(c))
2391                                 break;
2392                         left--;
2393                 }
2394         }
2395         if (write && first)
2396                 return -EINVAL;
2397         *lenp -= left;
2398         *ppos += *lenp;
2399         return 0;
2400 #undef TMPBUFLEN
2401 }
2402
2403 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2404                                      void __user *buffer,
2405                                      size_t *lenp, loff_t *ppos,
2406                                      unsigned long convmul,
2407                                      unsigned long convdiv)
2408 {
2409         return __do_proc_doulongvec_minmax(table->data, table, write,
2410                         buffer, lenp, ppos, convmul, convdiv);
2411 }
2412
2413 /**
2414  * proc_doulongvec_minmax - read a vector of long integers with min/max values
2415  * @table: the sysctl table
2416  * @write: %TRUE if this is a write to the sysctl file
2417  * @buffer: the user buffer
2418  * @lenp: the size of the user buffer
2419  * @ppos: file position
2420  *
2421  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2422  * values from/to the user buffer, treated as an ASCII string.
2423  *
2424  * This routine will ensure the values are within the range specified by
2425  * table->extra1 (min) and table->extra2 (max).
2426  *
2427  * Returns 0 on success.
2428  */
2429 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2430                            void __user *buffer, size_t *lenp, loff_t *ppos)
2431 {
2432     return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2433 }
2434
2435 /**
2436  * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2437  * @table: the sysctl table
2438  * @write: %TRUE if this is a write to the sysctl file
2439  * @buffer: the user buffer
2440  * @lenp: the size of the user buffer
2441  * @ppos: file position
2442  *
2443  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2444  * values from/to the user buffer, treated as an ASCII string. The values
2445  * are treated as milliseconds, and converted to jiffies when they are stored.
2446  *
2447  * This routine will ensure the values are within the range specified by
2448  * table->extra1 (min) and table->extra2 (max).
2449  *
2450  * Returns 0 on success.
2451  */
2452 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2453                                       void __user *buffer,
2454                                       size_t *lenp, loff_t *ppos)
2455 {
2456     return do_proc_doulongvec_minmax(table, write, buffer,
2457                                      lenp, ppos, HZ, 1000l);
2458 }
2459
2460
2461 static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp,
2462                                          int *valp,
2463                                          int write, void *data)
2464 {
2465         if (write) {
2466                 if (*lvalp > LONG_MAX / HZ)
2467                         return 1;
2468                 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2469         } else {
2470                 int val = *valp;
2471                 unsigned long lval;
2472                 if (val < 0) {
2473                         *negp = -1;
2474                         lval = (unsigned long)-val;
2475                 } else {
2476                         *negp = 0;
2477                         lval = (unsigned long)val;
2478                 }
2479                 *lvalp = lval / HZ;
2480         }
2481         return 0;
2482 }
2483
2484 static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp,
2485                                                 int *valp,
2486                                                 int write, void *data)
2487 {
2488         if (write) {
2489                 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2490                         return 1;
2491                 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2492         } else {
2493                 int val = *valp;
2494                 unsigned long lval;
2495                 if (val < 0) {
2496                         *negp = -1;
2497                         lval = (unsigned long)-val;
2498                 } else {
2499                         *negp = 0;
2500                         lval = (unsigned long)val;
2501                 }
2502                 *lvalp = jiffies_to_clock_t(lval);
2503         }
2504         return 0;
2505 }
2506
2507 static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp,
2508                                             int *valp,
2509                                             int write, void *data)
2510 {
2511         if (write) {
2512                 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2513         } else {
2514                 int val = *valp;
2515                 unsigned long lval;
2516                 if (val < 0) {
2517                         *negp = -1;
2518                         lval = (unsigned long)-val;
2519                 } else {
2520                         *negp = 0;
2521                         lval = (unsigned long)val;
2522                 }
2523                 *lvalp = jiffies_to_msecs(lval);
2524         }
2525         return 0;
2526 }
2527
2528 /**
2529  * proc_dointvec_jiffies - read a vector of integers as seconds
2530  * @table: the sysctl table
2531  * @write: %TRUE if this is a write to the sysctl file
2532  * @buffer: the user buffer
2533  * @lenp: the size of the user buffer
2534  * @ppos: file position
2535  *
2536  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2537  * values from/to the user buffer, treated as an ASCII string. 
2538  * The values read are assumed to be in seconds, and are converted into
2539  * jiffies.
2540  *
2541  * Returns 0 on success.
2542  */
2543 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2544                           void __user *buffer, size_t *lenp, loff_t *ppos)
2545 {
2546     return do_proc_dointvec(table,write,buffer,lenp,ppos,
2547                             do_proc_dointvec_jiffies_conv,NULL);
2548 }
2549
2550 /**
2551  * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2552  * @table: the sysctl table
2553  * @write: %TRUE if this is a write to the sysctl file
2554  * @buffer: the user buffer
2555  * @lenp: the size of the user buffer
2556  * @ppos: pointer to the file position
2557  *
2558  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2559  * values from/to the user buffer, treated as an ASCII string. 
2560  * The values read are assumed to be in 1/USER_HZ seconds, and 
2561  * are converted into jiffies.
2562  *
2563  * Returns 0 on success.
2564  */
2565 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2566                                  void __user *buffer, size_t *lenp, loff_t *ppos)
2567 {
2568     return do_proc_dointvec(table,write,buffer,lenp,ppos,
2569                             do_proc_dointvec_userhz_jiffies_conv,NULL);
2570 }
2571
2572 /**
2573  * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2574  * @table: the sysctl table
2575  * @write: %TRUE if this is a write to the sysctl file
2576  * @buffer: the user buffer
2577  * @lenp: the size of the user buffer
2578  * @ppos: file position
2579  * @ppos: the current position in the file
2580  *
2581  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2582  * values from/to the user buffer, treated as an ASCII string. 
2583  * The values read are assumed to be in 1/1000 seconds, and 
2584  * are converted into jiffies.
2585  *
2586  * Returns 0 on success.
2587  */
2588 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2589                              void __user *buffer, size_t *lenp, loff_t *ppos)
2590 {
2591         return do_proc_dointvec(table, write, buffer, lenp, ppos,
2592                                 do_proc_dointvec_ms_jiffies_conv, NULL);
2593 }
2594
2595 static int proc_do_cad_pid(struct ctl_table *table, int write,
2596                            void __user *buffer, size_t *lenp, loff_t *ppos)
2597 {
2598         struct pid *new_pid;
2599         pid_t tmp;
2600         int r;
2601
2602         tmp = pid_vnr(cad_pid);
2603
2604         r = __do_proc_dointvec(&tmp, table, write, buffer,
2605                                lenp, ppos, NULL, NULL);
2606         if (r || !write)
2607                 return r;
2608
2609         new_pid = find_get_pid(tmp);
2610         if (!new_pid)
2611                 return -ESRCH;
2612
2613         put_pid(xchg(&cad_pid, new_pid));
2614         return 0;
2615 }
2616
2617 #else /* CONFIG_PROC_FS */
2618
2619 int proc_dostring(struct ctl_table *table, int write,
2620                   void __user *buffer, size_t *lenp, loff_t *ppos)
2621 {
2622         return -ENOSYS;
2623 }
2624
2625 int proc_dointvec(struct ctl_table *table, int write,
2626                   void __user *buffer, size_t *lenp, loff_t *ppos)
2627 {
2628         return -ENOSYS;
2629 }
2630
2631 int proc_dointvec_minmax(struct ctl_table *table, int write,
2632                     void __user *buffer, size_t *lenp, loff_t *ppos)
2633 {
2634         return -ENOSYS;
2635 }
2636
2637 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2638                     void __user *buffer, size_t *lenp, loff_t *ppos)
2639 {
2640         return -ENOSYS;
2641 }
2642
2643 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2644                     void __user *buffer, size_t *lenp, loff_t *ppos)
2645 {
2646         return -ENOSYS;
2647 }
2648
2649 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2650                              void __user *buffer, size_t *lenp, loff_t *ppos)
2651 {
2652         return -ENOSYS;
2653 }
2654
2655 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2656                     void __user *buffer, size_t *lenp, loff_t *ppos)
2657 {
2658         return -ENOSYS;
2659 }
2660
2661 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2662                                       void __user *buffer,
2663                                       size_t *lenp, loff_t *ppos)
2664 {
2665     return -ENOSYS;
2666 }
2667
2668
2669 #endif /* CONFIG_PROC_FS */
2670
2671 /*
2672  * No sense putting this after each symbol definition, twice,
2673  * exception granted :-)
2674  */
2675 EXPORT_SYMBOL(proc_dointvec);
2676 EXPORT_SYMBOL(proc_dointvec_jiffies);
2677 EXPORT_SYMBOL(proc_dointvec_minmax);
2678 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2679 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2680 EXPORT_SYMBOL(proc_dostring);
2681 EXPORT_SYMBOL(proc_doulongvec_minmax);
2682 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
2683 EXPORT_SYMBOL(register_sysctl_table);
2684 EXPORT_SYMBOL(register_sysctl_paths);
2685 EXPORT_SYMBOL(unregister_sysctl_table);