hugetlb: derive huge pages nodes allowed from task mempolicy
[safe/jmp/linux-2.6] / 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/proc_fs.h>
27 #include <linux/security.h>
28 #include <linux/ctype.h>
29 #include <linux/kmemcheck.h>
30 #include <linux/fs.h>
31 #include <linux/init.h>
32 #include <linux/kernel.h>
33 #include <linux/kobject.h>
34 #include <linux/net.h>
35 #include <linux/sysrq.h>
36 #include <linux/highuid.h>
37 #include <linux/writeback.h>
38 #include <linux/ratelimit.h>
39 #include <linux/hugetlb.h>
40 #include <linux/initrd.h>
41 #include <linux/key.h>
42 #include <linux/times.h>
43 #include <linux/limits.h>
44 #include <linux/dcache.h>
45 #include <linux/syscalls.h>
46 #include <linux/vmstat.h>
47 #include <linux/nfs_fs.h>
48 #include <linux/acpi.h>
49 #include <linux/reboot.h>
50 #include <linux/ftrace.h>
51 #include <linux/slow-work.h>
52 #include <linux/perf_event.h>
53
54 #include <asm/uaccess.h>
55 #include <asm/processor.h>
56
57 #ifdef CONFIG_X86
58 #include <asm/nmi.h>
59 #include <asm/stacktrace.h>
60 #include <asm/io.h>
61 #endif
62
63
64 #if defined(CONFIG_SYSCTL)
65
66 /* External variables not in a header file. */
67 extern int C_A_D;
68 extern int print_fatal_signals;
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_RCU_TORTURE_TEST
91 extern int rcutorture_runnable;
92 #endif /* #ifdef CONFIG_RCU_TORTURE_TEST */
93 #ifdef CONFIG_BLOCK
94 extern int blk_iopoll_enabled;
95 #endif
96
97 /* Constants used for minimum and  maximum */
98 #ifdef CONFIG_DETECT_SOFTLOCKUP
99 static int sixty = 60;
100 static int neg_one = -1;
101 #endif
102
103 static int zero;
104 static int __maybe_unused one = 1;
105 static int __maybe_unused two = 2;
106 static unsigned long one_ul = 1;
107 static int one_hundred = 100;
108 #ifdef CONFIG_PRINTK
109 static int ten_thousand = 10000;
110 #endif
111
112 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
113 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
114
115 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
116 static int maxolduid = 65535;
117 static int minolduid;
118 static int min_percpu_pagelist_fract = 8;
119
120 static int ngroups_max = NGROUPS_MAX;
121
122 #ifdef CONFIG_MODULES
123 extern char modprobe_path[];
124 extern int modules_disabled;
125 #endif
126 #ifdef CONFIG_CHR_DEV_SG
127 extern int sg_big_buff;
128 #endif
129
130 #ifdef CONFIG_SPARC
131 #include <asm/system.h>
132 #endif
133
134 #ifdef CONFIG_SPARC64
135 extern int sysctl_tsb_ratio;
136 #endif
137
138 #ifdef __hppa__
139 extern int pwrsw_enabled;
140 extern int unaligned_enabled;
141 #endif
142
143 #ifdef CONFIG_S390
144 #ifdef CONFIG_MATHEMU
145 extern int sysctl_ieee_emulation_warnings;
146 #endif
147 extern int sysctl_userprocess_debug;
148 extern int spin_retry;
149 #endif
150
151 #ifdef CONFIG_BSD_PROCESS_ACCT
152 extern int acct_parm[];
153 #endif
154
155 #ifdef CONFIG_IA64
156 extern int no_unaligned_warning;
157 extern int unaligned_dump_stack;
158 #endif
159
160 extern struct ratelimit_state printk_ratelimit_state;
161
162 #ifdef CONFIG_RT_MUTEXES
163 extern int max_lock_depth;
164 #endif
165
166 #ifdef CONFIG_PROC_SYSCTL
167 static int proc_do_cad_pid(struct ctl_table *table, int write,
168                   void __user *buffer, size_t *lenp, loff_t *ppos);
169 static int proc_taint(struct ctl_table *table, int write,
170                                void __user *buffer, size_t *lenp, loff_t *ppos);
171 #endif
172
173 static struct ctl_table root_table[];
174 static struct ctl_table_root sysctl_table_root;
175 static struct ctl_table_header root_table_header = {
176         .count = 1,
177         .ctl_table = root_table,
178         .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.default_set.list),
179         .root = &sysctl_table_root,
180         .set = &sysctl_table_root.default_set,
181 };
182 static struct ctl_table_root sysctl_table_root = {
183         .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list),
184         .default_set.list = LIST_HEAD_INIT(root_table_header.ctl_entry),
185 };
186
187 static struct ctl_table kern_table[];
188 static struct ctl_table vm_table[];
189 static struct ctl_table fs_table[];
190 static struct ctl_table debug_table[];
191 static struct ctl_table dev_table[];
192 extern struct ctl_table random_table[];
193 #ifdef CONFIG_INOTIFY_USER
194 extern struct ctl_table inotify_table[];
195 #endif
196 #ifdef CONFIG_EPOLL
197 extern struct ctl_table epoll_table[];
198 #endif
199
200 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
201 int sysctl_legacy_va_layout;
202 #endif
203
204 extern int prove_locking;
205 extern int lock_stat;
206
207 /* The default sysctl tables: */
208
209 static struct ctl_table root_table[] = {
210         {
211                 .procname       = "kernel",
212                 .mode           = 0555,
213                 .child          = kern_table,
214         },
215         {
216                 .procname       = "vm",
217                 .mode           = 0555,
218                 .child          = vm_table,
219         },
220         {
221                 .procname       = "fs",
222                 .mode           = 0555,
223                 .child          = fs_table,
224         },
225         {
226                 .procname       = "debug",
227                 .mode           = 0555,
228                 .child          = debug_table,
229         },
230         {
231                 .procname       = "dev",
232                 .mode           = 0555,
233                 .child          = dev_table,
234         },
235 /*
236  * NOTE: do not add new entries to this table unless you have read
237  * Documentation/sysctl/ctl_unnumbered.txt
238  */
239         { }
240 };
241
242 #ifdef CONFIG_SCHED_DEBUG
243 static int min_sched_granularity_ns = 100000;           /* 100 usecs */
244 static int max_sched_granularity_ns = NSEC_PER_SEC;     /* 1 second */
245 static int min_wakeup_granularity_ns;                   /* 0 usecs */
246 static int max_wakeup_granularity_ns = NSEC_PER_SEC;    /* 1 second */
247 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
248 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
249 static int min_sched_shares_ratelimit = 100000; /* 100 usec */
250 static int max_sched_shares_ratelimit = NSEC_PER_SEC; /* 1 second */
251 #endif
252
253 static struct ctl_table kern_table[] = {
254         {
255                 .procname       = "sched_child_runs_first",
256                 .data           = &sysctl_sched_child_runs_first,
257                 .maxlen         = sizeof(unsigned int),
258                 .mode           = 0644,
259                 .proc_handler   = proc_dointvec,
260         },
261 #ifdef CONFIG_SCHED_DEBUG
262         {
263                 .procname       = "sched_min_granularity_ns",
264                 .data           = &sysctl_sched_min_granularity,
265                 .maxlen         = sizeof(unsigned int),
266                 .mode           = 0644,
267                 .proc_handler   = sched_proc_update_handler,
268                 .extra1         = &min_sched_granularity_ns,
269                 .extra2         = &max_sched_granularity_ns,
270         },
271         {
272                 .procname       = "sched_latency_ns",
273                 .data           = &sysctl_sched_latency,
274                 .maxlen         = sizeof(unsigned int),
275                 .mode           = 0644,
276                 .proc_handler   = sched_proc_update_handler,
277                 .extra1         = &min_sched_granularity_ns,
278                 .extra2         = &max_sched_granularity_ns,
279         },
280         {
281                 .procname       = "sched_wakeup_granularity_ns",
282                 .data           = &sysctl_sched_wakeup_granularity,
283                 .maxlen         = sizeof(unsigned int),
284                 .mode           = 0644,
285                 .proc_handler   = sched_proc_update_handler,
286                 .extra1         = &min_wakeup_granularity_ns,
287                 .extra2         = &max_wakeup_granularity_ns,
288         },
289         {
290                 .procname       = "sched_shares_ratelimit",
291                 .data           = &sysctl_sched_shares_ratelimit,
292                 .maxlen         = sizeof(unsigned int),
293                 .mode           = 0644,
294                 .proc_handler   = sched_proc_update_handler,
295                 .extra1         = &min_sched_shares_ratelimit,
296                 .extra2         = &max_sched_shares_ratelimit,
297         },
298         {
299                 .procname       = "sched_tunable_scaling",
300                 .data           = &sysctl_sched_tunable_scaling,
301                 .maxlen         = sizeof(enum sched_tunable_scaling),
302                 .mode           = 0644,
303                 .proc_handler   = sched_proc_update_handler,
304                 .extra1         = &min_sched_tunable_scaling,
305                 .extra2         = &max_sched_tunable_scaling,
306         },
307         {
308                 .procname       = "sched_shares_thresh",
309                 .data           = &sysctl_sched_shares_thresh,
310                 .maxlen         = sizeof(unsigned int),
311                 .mode           = 0644,
312                 .proc_handler   = proc_dointvec_minmax,
313                 .extra1         = &zero,
314         },
315         {
316                 .procname       = "sched_migration_cost",
317                 .data           = &sysctl_sched_migration_cost,
318                 .maxlen         = sizeof(unsigned int),
319                 .mode           = 0644,
320                 .proc_handler   = proc_dointvec,
321         },
322         {
323                 .procname       = "sched_nr_migrate",
324                 .data           = &sysctl_sched_nr_migrate,
325                 .maxlen         = sizeof(unsigned int),
326                 .mode           = 0644,
327                 .proc_handler   = proc_dointvec,
328         },
329         {
330                 .procname       = "sched_time_avg",
331                 .data           = &sysctl_sched_time_avg,
332                 .maxlen         = sizeof(unsigned int),
333                 .mode           = 0644,
334                 .proc_handler   = proc_dointvec,
335         },
336         {
337                 .procname       = "timer_migration",
338                 .data           = &sysctl_timer_migration,
339                 .maxlen         = sizeof(unsigned int),
340                 .mode           = 0644,
341                 .proc_handler   = proc_dointvec_minmax,
342                 .extra1         = &zero,
343                 .extra2         = &one,
344         },
345 #endif
346         {
347                 .procname       = "sched_rt_period_us",
348                 .data           = &sysctl_sched_rt_period,
349                 .maxlen         = sizeof(unsigned int),
350                 .mode           = 0644,
351                 .proc_handler   = sched_rt_handler,
352         },
353         {
354                 .procname       = "sched_rt_runtime_us",
355                 .data           = &sysctl_sched_rt_runtime,
356                 .maxlen         = sizeof(int),
357                 .mode           = 0644,
358                 .proc_handler   = sched_rt_handler,
359         },
360         {
361                 .procname       = "sched_compat_yield",
362                 .data           = &sysctl_sched_compat_yield,
363                 .maxlen         = sizeof(unsigned int),
364                 .mode           = 0644,
365                 .proc_handler   = proc_dointvec,
366         },
367 #ifdef CONFIG_PROVE_LOCKING
368         {
369                 .procname       = "prove_locking",
370                 .data           = &prove_locking,
371                 .maxlen         = sizeof(int),
372                 .mode           = 0644,
373                 .proc_handler   = proc_dointvec,
374         },
375 #endif
376 #ifdef CONFIG_LOCK_STAT
377         {
378                 .procname       = "lock_stat",
379                 .data           = &lock_stat,
380                 .maxlen         = sizeof(int),
381                 .mode           = 0644,
382                 .proc_handler   = proc_dointvec,
383         },
384 #endif
385         {
386                 .procname       = "panic",
387                 .data           = &panic_timeout,
388                 .maxlen         = sizeof(int),
389                 .mode           = 0644,
390                 .proc_handler   = proc_dointvec,
391         },
392         {
393                 .procname       = "core_uses_pid",
394                 .data           = &core_uses_pid,
395                 .maxlen         = sizeof(int),
396                 .mode           = 0644,
397                 .proc_handler   = proc_dointvec,
398         },
399         {
400                 .procname       = "core_pattern",
401                 .data           = core_pattern,
402                 .maxlen         = CORENAME_MAX_SIZE,
403                 .mode           = 0644,
404                 .proc_handler   = proc_dostring,
405         },
406         {
407                 .procname       = "core_pipe_limit",
408                 .data           = &core_pipe_limit,
409                 .maxlen         = sizeof(unsigned int),
410                 .mode           = 0644,
411                 .proc_handler   = proc_dointvec,
412         },
413 #ifdef CONFIG_PROC_SYSCTL
414         {
415                 .procname       = "tainted",
416                 .maxlen         = sizeof(long),
417                 .mode           = 0644,
418                 .proc_handler   = proc_taint,
419         },
420 #endif
421 #ifdef CONFIG_LATENCYTOP
422         {
423                 .procname       = "latencytop",
424                 .data           = &latencytop_enabled,
425                 .maxlen         = sizeof(int),
426                 .mode           = 0644,
427                 .proc_handler   = proc_dointvec,
428         },
429 #endif
430 #ifdef CONFIG_BLK_DEV_INITRD
431         {
432                 .procname       = "real-root-dev",
433                 .data           = &real_root_dev,
434                 .maxlen         = sizeof(int),
435                 .mode           = 0644,
436                 .proc_handler   = proc_dointvec,
437         },
438 #endif
439         {
440                 .procname       = "print-fatal-signals",
441                 .data           = &print_fatal_signals,
442                 .maxlen         = sizeof(int),
443                 .mode           = 0644,
444                 .proc_handler   = proc_dointvec,
445         },
446 #ifdef CONFIG_SPARC
447         {
448                 .procname       = "reboot-cmd",
449                 .data           = reboot_command,
450                 .maxlen         = 256,
451                 .mode           = 0644,
452                 .proc_handler   = proc_dostring,
453         },
454         {
455                 .procname       = "stop-a",
456                 .data           = &stop_a_enabled,
457                 .maxlen         = sizeof (int),
458                 .mode           = 0644,
459                 .proc_handler   = proc_dointvec,
460         },
461         {
462                 .procname       = "scons-poweroff",
463                 .data           = &scons_pwroff,
464                 .maxlen         = sizeof (int),
465                 .mode           = 0644,
466                 .proc_handler   = proc_dointvec,
467         },
468 #endif
469 #ifdef CONFIG_SPARC64
470         {
471                 .procname       = "tsb-ratio",
472                 .data           = &sysctl_tsb_ratio,
473                 .maxlen         = sizeof (int),
474                 .mode           = 0644,
475                 .proc_handler   = proc_dointvec,
476         },
477 #endif
478 #ifdef __hppa__
479         {
480                 .procname       = "soft-power",
481                 .data           = &pwrsw_enabled,
482                 .maxlen         = sizeof (int),
483                 .mode           = 0644,
484                 .proc_handler   = proc_dointvec,
485         },
486         {
487                 .procname       = "unaligned-trap",
488                 .data           = &unaligned_enabled,
489                 .maxlen         = sizeof (int),
490                 .mode           = 0644,
491                 .proc_handler   = proc_dointvec,
492         },
493 #endif
494         {
495                 .procname       = "ctrl-alt-del",
496                 .data           = &C_A_D,
497                 .maxlen         = sizeof(int),
498                 .mode           = 0644,
499                 .proc_handler   = proc_dointvec,
500         },
501 #ifdef CONFIG_FUNCTION_TRACER
502         {
503                 .procname       = "ftrace_enabled",
504                 .data           = &ftrace_enabled,
505                 .maxlen         = sizeof(int),
506                 .mode           = 0644,
507                 .proc_handler   = ftrace_enable_sysctl,
508         },
509 #endif
510 #ifdef CONFIG_STACK_TRACER
511         {
512                 .procname       = "stack_tracer_enabled",
513                 .data           = &stack_tracer_enabled,
514                 .maxlen         = sizeof(int),
515                 .mode           = 0644,
516                 .proc_handler   = stack_trace_sysctl,
517         },
518 #endif
519 #ifdef CONFIG_TRACING
520         {
521                 .procname       = "ftrace_dump_on_oops",
522                 .data           = &ftrace_dump_on_oops,
523                 .maxlen         = sizeof(int),
524                 .mode           = 0644,
525                 .proc_handler   = proc_dointvec,
526         },
527 #endif
528 #ifdef CONFIG_MODULES
529         {
530                 .procname       = "modprobe",
531                 .data           = &modprobe_path,
532                 .maxlen         = KMOD_PATH_LEN,
533                 .mode           = 0644,
534                 .proc_handler   = proc_dostring,
535         },
536         {
537                 .procname       = "modules_disabled",
538                 .data           = &modules_disabled,
539                 .maxlen         = sizeof(int),
540                 .mode           = 0644,
541                 /* only handle a transition from default "0" to "1" */
542                 .proc_handler   = proc_dointvec_minmax,
543                 .extra1         = &one,
544                 .extra2         = &one,
545         },
546 #endif
547 #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
548         {
549                 .procname       = "hotplug",
550                 .data           = &uevent_helper,
551                 .maxlen         = UEVENT_HELPER_PATH_LEN,
552                 .mode           = 0644,
553                 .proc_handler   = proc_dostring,
554         },
555 #endif
556 #ifdef CONFIG_CHR_DEV_SG
557         {
558                 .procname       = "sg-big-buff",
559                 .data           = &sg_big_buff,
560                 .maxlen         = sizeof (int),
561                 .mode           = 0444,
562                 .proc_handler   = proc_dointvec,
563         },
564 #endif
565 #ifdef CONFIG_BSD_PROCESS_ACCT
566         {
567                 .procname       = "acct",
568                 .data           = &acct_parm,
569                 .maxlen         = 3*sizeof(int),
570                 .mode           = 0644,
571                 .proc_handler   = proc_dointvec,
572         },
573 #endif
574 #ifdef CONFIG_MAGIC_SYSRQ
575         {
576                 .procname       = "sysrq",
577                 .data           = &__sysrq_enabled,
578                 .maxlen         = sizeof (int),
579                 .mode           = 0644,
580                 .proc_handler   = proc_dointvec,
581         },
582 #endif
583 #ifdef CONFIG_PROC_SYSCTL
584         {
585                 .procname       = "cad_pid",
586                 .data           = NULL,
587                 .maxlen         = sizeof (int),
588                 .mode           = 0600,
589                 .proc_handler   = proc_do_cad_pid,
590         },
591 #endif
592         {
593                 .procname       = "threads-max",
594                 .data           = &max_threads,
595                 .maxlen         = sizeof(int),
596                 .mode           = 0644,
597                 .proc_handler   = proc_dointvec,
598         },
599         {
600                 .procname       = "random",
601                 .mode           = 0555,
602                 .child          = random_table,
603         },
604         {
605                 .procname       = "overflowuid",
606                 .data           = &overflowuid,
607                 .maxlen         = sizeof(int),
608                 .mode           = 0644,
609                 .proc_handler   = proc_dointvec_minmax,
610                 .extra1         = &minolduid,
611                 .extra2         = &maxolduid,
612         },
613         {
614                 .procname       = "overflowgid",
615                 .data           = &overflowgid,
616                 .maxlen         = sizeof(int),
617                 .mode           = 0644,
618                 .proc_handler   = proc_dointvec_minmax,
619                 .extra1         = &minolduid,
620                 .extra2         = &maxolduid,
621         },
622 #ifdef CONFIG_S390
623 #ifdef CONFIG_MATHEMU
624         {
625                 .procname       = "ieee_emulation_warnings",
626                 .data           = &sysctl_ieee_emulation_warnings,
627                 .maxlen         = sizeof(int),
628                 .mode           = 0644,
629                 .proc_handler   = proc_dointvec,
630         },
631 #endif
632         {
633                 .procname       = "userprocess_debug",
634                 .data           = &sysctl_userprocess_debug,
635                 .maxlen         = sizeof(int),
636                 .mode           = 0644,
637                 .proc_handler   = proc_dointvec,
638         },
639 #endif
640         {
641                 .procname       = "pid_max",
642                 .data           = &pid_max,
643                 .maxlen         = sizeof (int),
644                 .mode           = 0644,
645                 .proc_handler   = proc_dointvec_minmax,
646                 .extra1         = &pid_max_min,
647                 .extra2         = &pid_max_max,
648         },
649         {
650                 .procname       = "panic_on_oops",
651                 .data           = &panic_on_oops,
652                 .maxlen         = sizeof(int),
653                 .mode           = 0644,
654                 .proc_handler   = proc_dointvec,
655         },
656 #if defined CONFIG_PRINTK
657         {
658                 .procname       = "printk",
659                 .data           = &console_loglevel,
660                 .maxlen         = 4*sizeof(int),
661                 .mode           = 0644,
662                 .proc_handler   = proc_dointvec,
663         },
664         {
665                 .procname       = "printk_ratelimit",
666                 .data           = &printk_ratelimit_state.interval,
667                 .maxlen         = sizeof(int),
668                 .mode           = 0644,
669                 .proc_handler   = proc_dointvec_jiffies,
670         },
671         {
672                 .procname       = "printk_ratelimit_burst",
673                 .data           = &printk_ratelimit_state.burst,
674                 .maxlen         = sizeof(int),
675                 .mode           = 0644,
676                 .proc_handler   = proc_dointvec,
677         },
678         {
679                 .procname       = "printk_delay",
680                 .data           = &printk_delay_msec,
681                 .maxlen         = sizeof(int),
682                 .mode           = 0644,
683                 .proc_handler   = proc_dointvec_minmax,
684                 .extra1         = &zero,
685                 .extra2         = &ten_thousand,
686         },
687 #endif
688         {
689                 .procname       = "ngroups_max",
690                 .data           = &ngroups_max,
691                 .maxlen         = sizeof (int),
692                 .mode           = 0444,
693                 .proc_handler   = proc_dointvec,
694         },
695 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
696         {
697                 .procname       = "unknown_nmi_panic",
698                 .data           = &unknown_nmi_panic,
699                 .maxlen         = sizeof (int),
700                 .mode           = 0644,
701                 .proc_handler   = proc_dointvec,
702         },
703         {
704                 .procname       = "nmi_watchdog",
705                 .data           = &nmi_watchdog_enabled,
706                 .maxlen         = sizeof (int),
707                 .mode           = 0644,
708                 .proc_handler   = proc_nmi_enabled,
709         },
710 #endif
711 #if defined(CONFIG_X86)
712         {
713                 .procname       = "panic_on_unrecovered_nmi",
714                 .data           = &panic_on_unrecovered_nmi,
715                 .maxlen         = sizeof(int),
716                 .mode           = 0644,
717                 .proc_handler   = proc_dointvec,
718         },
719         {
720                 .procname       = "panic_on_io_nmi",
721                 .data           = &panic_on_io_nmi,
722                 .maxlen         = sizeof(int),
723                 .mode           = 0644,
724                 .proc_handler   = proc_dointvec,
725         },
726         {
727                 .procname       = "bootloader_type",
728                 .data           = &bootloader_type,
729                 .maxlen         = sizeof (int),
730                 .mode           = 0444,
731                 .proc_handler   = proc_dointvec,
732         },
733         {
734                 .procname       = "bootloader_version",
735                 .data           = &bootloader_version,
736                 .maxlen         = sizeof (int),
737                 .mode           = 0444,
738                 .proc_handler   = proc_dointvec,
739         },
740         {
741                 .procname       = "kstack_depth_to_print",
742                 .data           = &kstack_depth_to_print,
743                 .maxlen         = sizeof(int),
744                 .mode           = 0644,
745                 .proc_handler   = proc_dointvec,
746         },
747         {
748                 .procname       = "io_delay_type",
749                 .data           = &io_delay_type,
750                 .maxlen         = sizeof(int),
751                 .mode           = 0644,
752                 .proc_handler   = proc_dointvec,
753         },
754 #endif
755 #if defined(CONFIG_MMU)
756         {
757                 .procname       = "randomize_va_space",
758                 .data           = &randomize_va_space,
759                 .maxlen         = sizeof(int),
760                 .mode           = 0644,
761                 .proc_handler   = proc_dointvec,
762         },
763 #endif
764 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
765         {
766                 .procname       = "spin_retry",
767                 .data           = &spin_retry,
768                 .maxlen         = sizeof (int),
769                 .mode           = 0644,
770                 .proc_handler   = proc_dointvec,
771         },
772 #endif
773 #if     defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
774         {
775                 .procname       = "acpi_video_flags",
776                 .data           = &acpi_realmode_flags,
777                 .maxlen         = sizeof (unsigned long),
778                 .mode           = 0644,
779                 .proc_handler   = proc_doulongvec_minmax,
780         },
781 #endif
782 #ifdef CONFIG_IA64
783         {
784                 .procname       = "ignore-unaligned-usertrap",
785                 .data           = &no_unaligned_warning,
786                 .maxlen         = sizeof (int),
787                 .mode           = 0644,
788                 .proc_handler   = proc_dointvec,
789         },
790         {
791                 .procname       = "unaligned-dump-stack",
792                 .data           = &unaligned_dump_stack,
793                 .maxlen         = sizeof (int),
794                 .mode           = 0644,
795                 .proc_handler   = proc_dointvec,
796         },
797 #endif
798 #ifdef CONFIG_DETECT_SOFTLOCKUP
799         {
800                 .procname       = "softlockup_panic",
801                 .data           = &softlockup_panic,
802                 .maxlen         = sizeof(int),
803                 .mode           = 0644,
804                 .proc_handler   = proc_dointvec_minmax,
805                 .extra1         = &zero,
806                 .extra2         = &one,
807         },
808         {
809                 .procname       = "softlockup_thresh",
810                 .data           = &softlockup_thresh,
811                 .maxlen         = sizeof(int),
812                 .mode           = 0644,
813                 .proc_handler   = proc_dosoftlockup_thresh,
814                 .extra1         = &neg_one,
815                 .extra2         = &sixty,
816         },
817 #endif
818 #ifdef CONFIG_DETECT_HUNG_TASK
819         {
820                 .procname       = "hung_task_panic",
821                 .data           = &sysctl_hung_task_panic,
822                 .maxlen         = sizeof(int),
823                 .mode           = 0644,
824                 .proc_handler   = proc_dointvec_minmax,
825                 .extra1         = &zero,
826                 .extra2         = &one,
827         },
828         {
829                 .procname       = "hung_task_check_count",
830                 .data           = &sysctl_hung_task_check_count,
831                 .maxlen         = sizeof(unsigned long),
832                 .mode           = 0644,
833                 .proc_handler   = proc_doulongvec_minmax,
834         },
835         {
836                 .procname       = "hung_task_timeout_secs",
837                 .data           = &sysctl_hung_task_timeout_secs,
838                 .maxlen         = sizeof(unsigned long),
839                 .mode           = 0644,
840                 .proc_handler   = proc_dohung_task_timeout_secs,
841         },
842         {
843                 .procname       = "hung_task_warnings",
844                 .data           = &sysctl_hung_task_warnings,
845                 .maxlen         = sizeof(unsigned long),
846                 .mode           = 0644,
847                 .proc_handler   = proc_doulongvec_minmax,
848         },
849 #endif
850 #ifdef CONFIG_COMPAT
851         {
852                 .procname       = "compat-log",
853                 .data           = &compat_log,
854                 .maxlen         = sizeof (int),
855                 .mode           = 0644,
856                 .proc_handler   = proc_dointvec,
857         },
858 #endif
859 #ifdef CONFIG_RT_MUTEXES
860         {
861                 .procname       = "max_lock_depth",
862                 .data           = &max_lock_depth,
863                 .maxlen         = sizeof(int),
864                 .mode           = 0644,
865                 .proc_handler   = proc_dointvec,
866         },
867 #endif
868         {
869                 .procname       = "poweroff_cmd",
870                 .data           = &poweroff_cmd,
871                 .maxlen         = POWEROFF_CMD_PATH_LEN,
872                 .mode           = 0644,
873                 .proc_handler   = proc_dostring,
874         },
875 #ifdef CONFIG_KEYS
876         {
877                 .procname       = "keys",
878                 .mode           = 0555,
879                 .child          = key_sysctls,
880         },
881 #endif
882 #ifdef CONFIG_RCU_TORTURE_TEST
883         {
884                 .procname       = "rcutorture_runnable",
885                 .data           = &rcutorture_runnable,
886                 .maxlen         = sizeof(int),
887                 .mode           = 0644,
888                 .proc_handler   = proc_dointvec,
889         },
890 #endif
891 #ifdef CONFIG_SLOW_WORK
892         {
893                 .procname       = "slow-work",
894                 .mode           = 0555,
895                 .child          = slow_work_sysctls,
896         },
897 #endif
898 #ifdef CONFIG_PERF_EVENTS
899         {
900                 .procname       = "perf_event_paranoid",
901                 .data           = &sysctl_perf_event_paranoid,
902                 .maxlen         = sizeof(sysctl_perf_event_paranoid),
903                 .mode           = 0644,
904                 .proc_handler   = proc_dointvec,
905         },
906         {
907                 .procname       = "perf_event_mlock_kb",
908                 .data           = &sysctl_perf_event_mlock,
909                 .maxlen         = sizeof(sysctl_perf_event_mlock),
910                 .mode           = 0644,
911                 .proc_handler   = proc_dointvec,
912         },
913         {
914                 .procname       = "perf_event_max_sample_rate",
915                 .data           = &sysctl_perf_event_sample_rate,
916                 .maxlen         = sizeof(sysctl_perf_event_sample_rate),
917                 .mode           = 0644,
918                 .proc_handler   = proc_dointvec,
919         },
920 #endif
921 #ifdef CONFIG_KMEMCHECK
922         {
923                 .procname       = "kmemcheck",
924                 .data           = &kmemcheck_enabled,
925                 .maxlen         = sizeof(int),
926                 .mode           = 0644,
927                 .proc_handler   = proc_dointvec,
928         },
929 #endif
930 #ifdef CONFIG_BLOCK
931         {
932                 .procname       = "blk_iopoll",
933                 .data           = &blk_iopoll_enabled,
934                 .maxlen         = sizeof(int),
935                 .mode           = 0644,
936                 .proc_handler   = proc_dointvec,
937         },
938 #endif
939 /*
940  * NOTE: do not add new entries to this table unless you have read
941  * Documentation/sysctl/ctl_unnumbered.txt
942  */
943         { }
944 };
945
946 static struct ctl_table vm_table[] = {
947         {
948                 .procname       = "overcommit_memory",
949                 .data           = &sysctl_overcommit_memory,
950                 .maxlen         = sizeof(sysctl_overcommit_memory),
951                 .mode           = 0644,
952                 .proc_handler   = proc_dointvec,
953         },
954         {
955                 .procname       = "panic_on_oom",
956                 .data           = &sysctl_panic_on_oom,
957                 .maxlen         = sizeof(sysctl_panic_on_oom),
958                 .mode           = 0644,
959                 .proc_handler   = proc_dointvec,
960         },
961         {
962                 .procname       = "oom_kill_allocating_task",
963                 .data           = &sysctl_oom_kill_allocating_task,
964                 .maxlen         = sizeof(sysctl_oom_kill_allocating_task),
965                 .mode           = 0644,
966                 .proc_handler   = proc_dointvec,
967         },
968         {
969                 .procname       = "oom_dump_tasks",
970                 .data           = &sysctl_oom_dump_tasks,
971                 .maxlen         = sizeof(sysctl_oom_dump_tasks),
972                 .mode           = 0644,
973                 .proc_handler   = proc_dointvec,
974         },
975         {
976                 .procname       = "overcommit_ratio",
977                 .data           = &sysctl_overcommit_ratio,
978                 .maxlen         = sizeof(sysctl_overcommit_ratio),
979                 .mode           = 0644,
980                 .proc_handler   = proc_dointvec,
981         },
982         {
983                 .procname       = "page-cluster", 
984                 .data           = &page_cluster,
985                 .maxlen         = sizeof(int),
986                 .mode           = 0644,
987                 .proc_handler   = proc_dointvec,
988         },
989         {
990                 .procname       = "dirty_background_ratio",
991                 .data           = &dirty_background_ratio,
992                 .maxlen         = sizeof(dirty_background_ratio),
993                 .mode           = 0644,
994                 .proc_handler   = dirty_background_ratio_handler,
995                 .extra1         = &zero,
996                 .extra2         = &one_hundred,
997         },
998         {
999                 .procname       = "dirty_background_bytes",
1000                 .data           = &dirty_background_bytes,
1001                 .maxlen         = sizeof(dirty_background_bytes),
1002                 .mode           = 0644,
1003                 .proc_handler   = dirty_background_bytes_handler,
1004                 .extra1         = &one_ul,
1005         },
1006         {
1007                 .procname       = "dirty_ratio",
1008                 .data           = &vm_dirty_ratio,
1009                 .maxlen         = sizeof(vm_dirty_ratio),
1010                 .mode           = 0644,
1011                 .proc_handler   = dirty_ratio_handler,
1012                 .extra1         = &zero,
1013                 .extra2         = &one_hundred,
1014         },
1015         {
1016                 .procname       = "dirty_bytes",
1017                 .data           = &vm_dirty_bytes,
1018                 .maxlen         = sizeof(vm_dirty_bytes),
1019                 .mode           = 0644,
1020                 .proc_handler   = dirty_bytes_handler,
1021                 .extra1         = &dirty_bytes_min,
1022         },
1023         {
1024                 .procname       = "dirty_writeback_centisecs",
1025                 .data           = &dirty_writeback_interval,
1026                 .maxlen         = sizeof(dirty_writeback_interval),
1027                 .mode           = 0644,
1028                 .proc_handler   = dirty_writeback_centisecs_handler,
1029         },
1030         {
1031                 .procname       = "dirty_expire_centisecs",
1032                 .data           = &dirty_expire_interval,
1033                 .maxlen         = sizeof(dirty_expire_interval),
1034                 .mode           = 0644,
1035                 .proc_handler   = proc_dointvec,
1036         },
1037         {
1038                 .procname       = "nr_pdflush_threads",
1039                 .data           = &nr_pdflush_threads,
1040                 .maxlen         = sizeof nr_pdflush_threads,
1041                 .mode           = 0444 /* read-only*/,
1042                 .proc_handler   = proc_dointvec,
1043         },
1044         {
1045                 .procname       = "swappiness",
1046                 .data           = &vm_swappiness,
1047                 .maxlen         = sizeof(vm_swappiness),
1048                 .mode           = 0644,
1049                 .proc_handler   = proc_dointvec_minmax,
1050                 .extra1         = &zero,
1051                 .extra2         = &one_hundred,
1052         },
1053 #ifdef CONFIG_HUGETLB_PAGE
1054         {
1055                 .procname       = "nr_hugepages",
1056                 .data           = NULL,
1057                 .maxlen         = sizeof(unsigned long),
1058                 .mode           = 0644,
1059                 .proc_handler   = hugetlb_sysctl_handler,
1060                 .extra1         = (void *)&hugetlb_zero,
1061                 .extra2         = (void *)&hugetlb_infinity,
1062         },
1063 #ifdef CONFIG_NUMA
1064         {
1065                 .procname       = "nr_hugepages_mempolicy",
1066                 .data           = NULL,
1067                 .maxlen         = sizeof(unsigned long),
1068                 .mode           = 0644,
1069                 .proc_handler   = &hugetlb_mempolicy_sysctl_handler,
1070                 .extra1         = (void *)&hugetlb_zero,
1071                 .extra2         = (void *)&hugetlb_infinity,
1072         },
1073 #endif
1074          {
1075                 .procname       = "hugetlb_shm_group",
1076                 .data           = &sysctl_hugetlb_shm_group,
1077                 .maxlen         = sizeof(gid_t),
1078                 .mode           = 0644,
1079                 .proc_handler   = proc_dointvec,
1080          },
1081          {
1082                 .procname       = "hugepages_treat_as_movable",
1083                 .data           = &hugepages_treat_as_movable,
1084                 .maxlen         = sizeof(int),
1085                 .mode           = 0644,
1086                 .proc_handler   = hugetlb_treat_movable_handler,
1087         },
1088         {
1089                 .procname       = "nr_overcommit_hugepages",
1090                 .data           = NULL,
1091                 .maxlen         = sizeof(unsigned long),
1092                 .mode           = 0644,
1093                 .proc_handler   = hugetlb_overcommit_handler,
1094                 .extra1         = (void *)&hugetlb_zero,
1095                 .extra2         = (void *)&hugetlb_infinity,
1096         },
1097 #endif
1098         {
1099                 .procname       = "lowmem_reserve_ratio",
1100                 .data           = &sysctl_lowmem_reserve_ratio,
1101                 .maxlen         = sizeof(sysctl_lowmem_reserve_ratio),
1102                 .mode           = 0644,
1103                 .proc_handler   = lowmem_reserve_ratio_sysctl_handler,
1104         },
1105         {
1106                 .procname       = "drop_caches",
1107                 .data           = &sysctl_drop_caches,
1108                 .maxlen         = sizeof(int),
1109                 .mode           = 0644,
1110                 .proc_handler   = drop_caches_sysctl_handler,
1111         },
1112         {
1113                 .procname       = "min_free_kbytes",
1114                 .data           = &min_free_kbytes,
1115                 .maxlen         = sizeof(min_free_kbytes),
1116                 .mode           = 0644,
1117                 .proc_handler   = min_free_kbytes_sysctl_handler,
1118                 .extra1         = &zero,
1119         },
1120         {
1121                 .procname       = "percpu_pagelist_fraction",
1122                 .data           = &percpu_pagelist_fraction,
1123                 .maxlen         = sizeof(percpu_pagelist_fraction),
1124                 .mode           = 0644,
1125                 .proc_handler   = percpu_pagelist_fraction_sysctl_handler,
1126                 .extra1         = &min_percpu_pagelist_fract,
1127         },
1128 #ifdef CONFIG_MMU
1129         {
1130                 .procname       = "max_map_count",
1131                 .data           = &sysctl_max_map_count,
1132                 .maxlen         = sizeof(sysctl_max_map_count),
1133                 .mode           = 0644,
1134                 .proc_handler   = proc_dointvec
1135         },
1136 #else
1137         {
1138                 .procname       = "nr_trim_pages",
1139                 .data           = &sysctl_nr_trim_pages,
1140                 .maxlen         = sizeof(sysctl_nr_trim_pages),
1141                 .mode           = 0644,
1142                 .proc_handler   = proc_dointvec_minmax,
1143                 .extra1         = &zero,
1144         },
1145 #endif
1146         {
1147                 .procname       = "laptop_mode",
1148                 .data           = &laptop_mode,
1149                 .maxlen         = sizeof(laptop_mode),
1150                 .mode           = 0644,
1151                 .proc_handler   = proc_dointvec_jiffies,
1152         },
1153         {
1154                 .procname       = "block_dump",
1155                 .data           = &block_dump,
1156                 .maxlen         = sizeof(block_dump),
1157                 .mode           = 0644,
1158                 .proc_handler   = proc_dointvec,
1159                 .extra1         = &zero,
1160         },
1161         {
1162                 .procname       = "vfs_cache_pressure",
1163                 .data           = &sysctl_vfs_cache_pressure,
1164                 .maxlen         = sizeof(sysctl_vfs_cache_pressure),
1165                 .mode           = 0644,
1166                 .proc_handler   = proc_dointvec,
1167                 .extra1         = &zero,
1168         },
1169 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1170         {
1171                 .procname       = "legacy_va_layout",
1172                 .data           = &sysctl_legacy_va_layout,
1173                 .maxlen         = sizeof(sysctl_legacy_va_layout),
1174                 .mode           = 0644,
1175                 .proc_handler   = proc_dointvec,
1176                 .extra1         = &zero,
1177         },
1178 #endif
1179 #ifdef CONFIG_NUMA
1180         {
1181                 .procname       = "zone_reclaim_mode",
1182                 .data           = &zone_reclaim_mode,
1183                 .maxlen         = sizeof(zone_reclaim_mode),
1184                 .mode           = 0644,
1185                 .proc_handler   = proc_dointvec,
1186                 .extra1         = &zero,
1187         },
1188         {
1189                 .procname       = "min_unmapped_ratio",
1190                 .data           = &sysctl_min_unmapped_ratio,
1191                 .maxlen         = sizeof(sysctl_min_unmapped_ratio),
1192                 .mode           = 0644,
1193                 .proc_handler   = sysctl_min_unmapped_ratio_sysctl_handler,
1194                 .extra1         = &zero,
1195                 .extra2         = &one_hundred,
1196         },
1197         {
1198                 .procname       = "min_slab_ratio",
1199                 .data           = &sysctl_min_slab_ratio,
1200                 .maxlen         = sizeof(sysctl_min_slab_ratio),
1201                 .mode           = 0644,
1202                 .proc_handler   = sysctl_min_slab_ratio_sysctl_handler,
1203                 .extra1         = &zero,
1204                 .extra2         = &one_hundred,
1205         },
1206 #endif
1207 #ifdef CONFIG_SMP
1208         {
1209                 .procname       = "stat_interval",
1210                 .data           = &sysctl_stat_interval,
1211                 .maxlen         = sizeof(sysctl_stat_interval),
1212                 .mode           = 0644,
1213                 .proc_handler   = proc_dointvec_jiffies,
1214         },
1215 #endif
1216         {
1217                 .procname       = "mmap_min_addr",
1218                 .data           = &dac_mmap_min_addr,
1219                 .maxlen         = sizeof(unsigned long),
1220                 .mode           = 0644,
1221                 .proc_handler   = mmap_min_addr_handler,
1222         },
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)
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         { }
1451 };
1452
1453 static struct ctl_table dev_table[] = {
1454         { }
1455 };
1456
1457 static DEFINE_SPINLOCK(sysctl_lock);
1458
1459 /* called under sysctl_lock */
1460 static int use_table(struct ctl_table_header *p)
1461 {
1462         if (unlikely(p->unregistering))
1463                 return 0;
1464         p->used++;
1465         return 1;
1466 }
1467
1468 /* called under sysctl_lock */
1469 static void unuse_table(struct ctl_table_header *p)
1470 {
1471         if (!--p->used)
1472                 if (unlikely(p->unregistering))
1473                         complete(p->unregistering);
1474 }
1475
1476 /* called under sysctl_lock, will reacquire if has to wait */
1477 static void start_unregistering(struct ctl_table_header *p)
1478 {
1479         /*
1480          * if p->used is 0, nobody will ever touch that entry again;
1481          * we'll eliminate all paths to it before dropping sysctl_lock
1482          */
1483         if (unlikely(p->used)) {
1484                 struct completion wait;
1485                 init_completion(&wait);
1486                 p->unregistering = &wait;
1487                 spin_unlock(&sysctl_lock);
1488                 wait_for_completion(&wait);
1489                 spin_lock(&sysctl_lock);
1490         } else {
1491                 /* anything non-NULL; we'll never dereference it */
1492                 p->unregistering = ERR_PTR(-EINVAL);
1493         }
1494         /*
1495          * do not remove from the list until nobody holds it; walking the
1496          * list in do_sysctl() relies on that.
1497          */
1498         list_del_init(&p->ctl_entry);
1499 }
1500
1501 void sysctl_head_get(struct ctl_table_header *head)
1502 {
1503         spin_lock(&sysctl_lock);
1504         head->count++;
1505         spin_unlock(&sysctl_lock);
1506 }
1507
1508 void sysctl_head_put(struct ctl_table_header *head)
1509 {
1510         spin_lock(&sysctl_lock);
1511         if (!--head->count)
1512                 kfree(head);
1513         spin_unlock(&sysctl_lock);
1514 }
1515
1516 struct ctl_table_header *sysctl_head_grab(struct ctl_table_header *head)
1517 {
1518         if (!head)
1519                 BUG();
1520         spin_lock(&sysctl_lock);
1521         if (!use_table(head))
1522                 head = ERR_PTR(-ENOENT);
1523         spin_unlock(&sysctl_lock);
1524         return head;
1525 }
1526
1527 void sysctl_head_finish(struct ctl_table_header *head)
1528 {
1529         if (!head)
1530                 return;
1531         spin_lock(&sysctl_lock);
1532         unuse_table(head);
1533         spin_unlock(&sysctl_lock);
1534 }
1535
1536 static struct ctl_table_set *
1537 lookup_header_set(struct ctl_table_root *root, struct nsproxy *namespaces)
1538 {
1539         struct ctl_table_set *set = &root->default_set;
1540         if (root->lookup)
1541                 set = root->lookup(root, namespaces);
1542         return set;
1543 }
1544
1545 static struct list_head *
1546 lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces)
1547 {
1548         struct ctl_table_set *set = lookup_header_set(root, namespaces);
1549         return &set->list;
1550 }
1551
1552 struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces,
1553                                             struct ctl_table_header *prev)
1554 {
1555         struct ctl_table_root *root;
1556         struct list_head *header_list;
1557         struct ctl_table_header *head;
1558         struct list_head *tmp;
1559
1560         spin_lock(&sysctl_lock);
1561         if (prev) {
1562                 head = prev;
1563                 tmp = &prev->ctl_entry;
1564                 unuse_table(prev);
1565                 goto next;
1566         }
1567         tmp = &root_table_header.ctl_entry;
1568         for (;;) {
1569                 head = list_entry(tmp, struct ctl_table_header, ctl_entry);
1570
1571                 if (!use_table(head))
1572                         goto next;
1573                 spin_unlock(&sysctl_lock);
1574                 return head;
1575         next:
1576                 root = head->root;
1577                 tmp = tmp->next;
1578                 header_list = lookup_header_list(root, namespaces);
1579                 if (tmp != header_list)
1580                         continue;
1581
1582                 do {
1583                         root = list_entry(root->root_list.next,
1584                                         struct ctl_table_root, root_list);
1585                         if (root == &sysctl_table_root)
1586                                 goto out;
1587                         header_list = lookup_header_list(root, namespaces);
1588                 } while (list_empty(header_list));
1589                 tmp = header_list->next;
1590         }
1591 out:
1592         spin_unlock(&sysctl_lock);
1593         return NULL;
1594 }
1595
1596 struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev)
1597 {
1598         return __sysctl_head_next(current->nsproxy, prev);
1599 }
1600
1601 void register_sysctl_root(struct ctl_table_root *root)
1602 {
1603         spin_lock(&sysctl_lock);
1604         list_add_tail(&root->root_list, &sysctl_table_root.root_list);
1605         spin_unlock(&sysctl_lock);
1606 }
1607
1608 /*
1609  * sysctl_perm does NOT grant the superuser all rights automatically, because
1610  * some sysctl variables are readonly even to root.
1611  */
1612
1613 static int test_perm(int mode, int op)
1614 {
1615         if (!current_euid())
1616                 mode >>= 6;
1617         else if (in_egroup_p(0))
1618                 mode >>= 3;
1619         if ((op & ~mode & (MAY_READ|MAY_WRITE|MAY_EXEC)) == 0)
1620                 return 0;
1621         return -EACCES;
1622 }
1623
1624 int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op)
1625 {
1626         int error;
1627         int mode;
1628
1629         error = security_sysctl(table, op & (MAY_READ | MAY_WRITE | MAY_EXEC));
1630         if (error)
1631                 return error;
1632
1633         if (root->permissions)
1634                 mode = root->permissions(root, current->nsproxy, table);
1635         else
1636                 mode = table->mode;
1637
1638         return test_perm(mode, op);
1639 }
1640
1641 static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table)
1642 {
1643         for (; table->procname; table++) {
1644                 table->parent = parent;
1645                 if (table->child)
1646                         sysctl_set_parent(table, table->child);
1647         }
1648 }
1649
1650 static __init int sysctl_init(void)
1651 {
1652         sysctl_set_parent(NULL, root_table);
1653 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1654         {
1655                 int err;
1656                 err = sysctl_check_table(current->nsproxy, root_table);
1657         }
1658 #endif
1659         return 0;
1660 }
1661
1662 core_initcall(sysctl_init);
1663
1664 static struct ctl_table *is_branch_in(struct ctl_table *branch,
1665                                       struct ctl_table *table)
1666 {
1667         struct ctl_table *p;
1668         const char *s = branch->procname;
1669
1670         /* branch should have named subdirectory as its first element */
1671         if (!s || !branch->child)
1672                 return NULL;
1673
1674         /* ... and nothing else */
1675         if (branch[1].procname)
1676                 return NULL;
1677
1678         /* table should contain subdirectory with the same name */
1679         for (p = table; p->procname; p++) {
1680                 if (!p->child)
1681                         continue;
1682                 if (p->procname && strcmp(p->procname, s) == 0)
1683                         return p;
1684         }
1685         return NULL;
1686 }
1687
1688 /* see if attaching q to p would be an improvement */
1689 static void try_attach(struct ctl_table_header *p, struct ctl_table_header *q)
1690 {
1691         struct ctl_table *to = p->ctl_table, *by = q->ctl_table;
1692         struct ctl_table *next;
1693         int is_better = 0;
1694         int not_in_parent = !p->attached_by;
1695
1696         while ((next = is_branch_in(by, to)) != NULL) {
1697                 if (by == q->attached_by)
1698                         is_better = 1;
1699                 if (to == p->attached_by)
1700                         not_in_parent = 1;
1701                 by = by->child;
1702                 to = next->child;
1703         }
1704
1705         if (is_better && not_in_parent) {
1706                 q->attached_by = by;
1707                 q->attached_to = to;
1708                 q->parent = p;
1709         }
1710 }
1711
1712 /**
1713  * __register_sysctl_paths - register a sysctl hierarchy
1714  * @root: List of sysctl headers to register on
1715  * @namespaces: Data to compute which lists of sysctl entries are visible
1716  * @path: The path to the directory the sysctl table is in.
1717  * @table: the top-level table structure
1718  *
1719  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1720  * array. A completely 0 filled entry terminates the table.
1721  *
1722  * The members of the &struct ctl_table structure are used as follows:
1723  *
1724  * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1725  *            enter a sysctl file
1726  *
1727  * data - a pointer to data for use by proc_handler
1728  *
1729  * maxlen - the maximum size in bytes of the data
1730  *
1731  * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1732  *
1733  * child - a pointer to the child sysctl table if this entry is a directory, or
1734  *         %NULL.
1735  *
1736  * proc_handler - the text handler routine (described below)
1737  *
1738  * de - for internal use by the sysctl routines
1739  *
1740  * extra1, extra2 - extra pointers usable by the proc handler routines
1741  *
1742  * Leaf nodes in the sysctl tree will be represented by a single file
1743  * under /proc; non-leaf nodes will be represented by directories.
1744  *
1745  * sysctl(2) can automatically manage read and write requests through
1746  * the sysctl table.  The data and maxlen fields of the ctl_table
1747  * struct enable minimal validation of the values being written to be
1748  * performed, and the mode field allows minimal authentication.
1749  *
1750  * There must be a proc_handler routine for any terminal nodes
1751  * mirrored under /proc/sys (non-terminals are handled by a built-in
1752  * directory handler).  Several default handlers are available to
1753  * cover common cases -
1754  *
1755  * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1756  * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(), 
1757  * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1758  *
1759  * It is the handler's job to read the input buffer from user memory
1760  * and process it. The handler should return 0 on success.
1761  *
1762  * This routine returns %NULL on a failure to register, and a pointer
1763  * to the table header on success.
1764  */
1765 struct ctl_table_header *__register_sysctl_paths(
1766         struct ctl_table_root *root,
1767         struct nsproxy *namespaces,
1768         const struct ctl_path *path, struct ctl_table *table)
1769 {
1770         struct ctl_table_header *header;
1771         struct ctl_table *new, **prevp;
1772         unsigned int n, npath;
1773         struct ctl_table_set *set;
1774
1775         /* Count the path components */
1776         for (npath = 0; path[npath].procname; ++npath)
1777                 ;
1778
1779         /*
1780          * For each path component, allocate a 2-element ctl_table array.
1781          * The first array element will be filled with the sysctl entry
1782          * for this, the second will be the sentinel (procname == 0).
1783          *
1784          * We allocate everything in one go so that we don't have to
1785          * worry about freeing additional memory in unregister_sysctl_table.
1786          */
1787         header = kzalloc(sizeof(struct ctl_table_header) +
1788                          (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL);
1789         if (!header)
1790                 return NULL;
1791
1792         new = (struct ctl_table *) (header + 1);
1793
1794         /* Now connect the dots */
1795         prevp = &header->ctl_table;
1796         for (n = 0; n < npath; ++n, ++path) {
1797                 /* Copy the procname */
1798                 new->procname = path->procname;
1799                 new->mode     = 0555;
1800
1801                 *prevp = new;
1802                 prevp = &new->child;
1803
1804                 new += 2;
1805         }
1806         *prevp = table;
1807         header->ctl_table_arg = table;
1808
1809         INIT_LIST_HEAD(&header->ctl_entry);
1810         header->used = 0;
1811         header->unregistering = NULL;
1812         header->root = root;
1813         sysctl_set_parent(NULL, header->ctl_table);
1814         header->count = 1;
1815 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1816         if (sysctl_check_table(namespaces, header->ctl_table)) {
1817                 kfree(header);
1818                 return NULL;
1819         }
1820 #endif
1821         spin_lock(&sysctl_lock);
1822         header->set = lookup_header_set(root, namespaces);
1823         header->attached_by = header->ctl_table;
1824         header->attached_to = root_table;
1825         header->parent = &root_table_header;
1826         for (set = header->set; set; set = set->parent) {
1827                 struct ctl_table_header *p;
1828                 list_for_each_entry(p, &set->list, ctl_entry) {
1829                         if (p->unregistering)
1830                                 continue;
1831                         try_attach(p, header);
1832                 }
1833         }
1834         header->parent->count++;
1835         list_add_tail(&header->ctl_entry, &header->set->list);
1836         spin_unlock(&sysctl_lock);
1837
1838         return header;
1839 }
1840
1841 /**
1842  * register_sysctl_table_path - register a sysctl table hierarchy
1843  * @path: The path to the directory the sysctl table is in.
1844  * @table: the top-level table structure
1845  *
1846  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1847  * array. A completely 0 filled entry terminates the table.
1848  *
1849  * See __register_sysctl_paths for more details.
1850  */
1851 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1852                                                 struct ctl_table *table)
1853 {
1854         return __register_sysctl_paths(&sysctl_table_root, current->nsproxy,
1855                                         path, table);
1856 }
1857
1858 /**
1859  * register_sysctl_table - register a sysctl table hierarchy
1860  * @table: the top-level table structure
1861  *
1862  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1863  * array. A completely 0 filled entry terminates the table.
1864  *
1865  * See register_sysctl_paths for more details.
1866  */
1867 struct ctl_table_header *register_sysctl_table(struct ctl_table *table)
1868 {
1869         static const struct ctl_path null_path[] = { {} };
1870
1871         return register_sysctl_paths(null_path, table);
1872 }
1873
1874 /**
1875  * unregister_sysctl_table - unregister a sysctl table hierarchy
1876  * @header: the header returned from register_sysctl_table
1877  *
1878  * Unregisters the sysctl table and all children. proc entries may not
1879  * actually be removed until they are no longer used by anyone.
1880  */
1881 void unregister_sysctl_table(struct ctl_table_header * header)
1882 {
1883         might_sleep();
1884
1885         if (header == NULL)
1886                 return;
1887
1888         spin_lock(&sysctl_lock);
1889         start_unregistering(header);
1890         if (!--header->parent->count) {
1891                 WARN_ON(1);
1892                 kfree(header->parent);
1893         }
1894         if (!--header->count)
1895                 kfree(header);
1896         spin_unlock(&sysctl_lock);
1897 }
1898
1899 int sysctl_is_seen(struct ctl_table_header *p)
1900 {
1901         struct ctl_table_set *set = p->set;
1902         int res;
1903         spin_lock(&sysctl_lock);
1904         if (p->unregistering)
1905                 res = 0;
1906         else if (!set->is_seen)
1907                 res = 1;
1908         else
1909                 res = set->is_seen(set);
1910         spin_unlock(&sysctl_lock);
1911         return res;
1912 }
1913
1914 void setup_sysctl_set(struct ctl_table_set *p,
1915         struct ctl_table_set *parent,
1916         int (*is_seen)(struct ctl_table_set *))
1917 {
1918         INIT_LIST_HEAD(&p->list);
1919         p->parent = parent ? parent : &sysctl_table_root.default_set;
1920         p->is_seen = is_seen;
1921 }
1922
1923 #else /* !CONFIG_SYSCTL */
1924 struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
1925 {
1926         return NULL;
1927 }
1928
1929 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1930                                                     struct ctl_table *table)
1931 {
1932         return NULL;
1933 }
1934
1935 void unregister_sysctl_table(struct ctl_table_header * table)
1936 {
1937 }
1938
1939 void setup_sysctl_set(struct ctl_table_set *p,
1940         struct ctl_table_set *parent,
1941         int (*is_seen)(struct ctl_table_set *))
1942 {
1943 }
1944
1945 void sysctl_head_put(struct ctl_table_header *head)
1946 {
1947 }
1948
1949 #endif /* CONFIG_SYSCTL */
1950
1951 /*
1952  * /proc/sys support
1953  */
1954
1955 #ifdef CONFIG_PROC_SYSCTL
1956
1957 static int _proc_do_string(void* data, int maxlen, int write,
1958                            void __user *buffer,
1959                            size_t *lenp, loff_t *ppos)
1960 {
1961         size_t len;
1962         char __user *p;
1963         char c;
1964
1965         if (!data || !maxlen || !*lenp) {
1966                 *lenp = 0;
1967                 return 0;
1968         }
1969
1970         if (write) {
1971                 len = 0;
1972                 p = buffer;
1973                 while (len < *lenp) {
1974                         if (get_user(c, p++))
1975                                 return -EFAULT;
1976                         if (c == 0 || c == '\n')
1977                                 break;
1978                         len++;
1979                 }
1980                 if (len >= maxlen)
1981                         len = maxlen-1;
1982                 if(copy_from_user(data, buffer, len))
1983                         return -EFAULT;
1984                 ((char *) data)[len] = 0;
1985                 *ppos += *lenp;
1986         } else {
1987                 len = strlen(data);
1988                 if (len > maxlen)
1989                         len = maxlen;
1990
1991                 if (*ppos > len) {
1992                         *lenp = 0;
1993                         return 0;
1994                 }
1995
1996                 data += *ppos;
1997                 len  -= *ppos;
1998
1999                 if (len > *lenp)
2000                         len = *lenp;
2001                 if (len)
2002                         if(copy_to_user(buffer, data, len))
2003                                 return -EFAULT;
2004                 if (len < *lenp) {
2005                         if(put_user('\n', ((char __user *) buffer) + len))
2006                                 return -EFAULT;
2007                         len++;
2008                 }
2009                 *lenp = len;
2010                 *ppos += len;
2011         }
2012         return 0;
2013 }
2014
2015 /**
2016  * proc_dostring - read a string sysctl
2017  * @table: the sysctl table
2018  * @write: %TRUE if this is a write to the sysctl file
2019  * @buffer: the user buffer
2020  * @lenp: the size of the user buffer
2021  * @ppos: file position
2022  *
2023  * Reads/writes a string from/to the user buffer. If the kernel
2024  * buffer provided is not large enough to hold the string, the
2025  * string is truncated. The copied string is %NULL-terminated.
2026  * If the string is being read by the user process, it is copied
2027  * and a newline '\n' is added. It is truncated if the buffer is
2028  * not large enough.
2029  *
2030  * Returns 0 on success.
2031  */
2032 int proc_dostring(struct ctl_table *table, int write,
2033                   void __user *buffer, size_t *lenp, loff_t *ppos)
2034 {
2035         return _proc_do_string(table->data, table->maxlen, write,
2036                                buffer, lenp, ppos);
2037 }
2038
2039
2040 static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp,
2041                                  int *valp,
2042                                  int write, void *data)
2043 {
2044         if (write) {
2045                 *valp = *negp ? -*lvalp : *lvalp;
2046         } else {
2047                 int val = *valp;
2048                 if (val < 0) {
2049                         *negp = -1;
2050                         *lvalp = (unsigned long)-val;
2051                 } else {
2052                         *negp = 0;
2053                         *lvalp = (unsigned long)val;
2054                 }
2055         }
2056         return 0;
2057 }
2058
2059 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
2060                   int write, void __user *buffer,
2061                   size_t *lenp, loff_t *ppos,
2062                   int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2063                               int write, void *data),
2064                   void *data)
2065 {
2066 #define TMPBUFLEN 21
2067         int *i, vleft, first = 1, neg;
2068         unsigned long lval;
2069         size_t left, len;
2070         
2071         char buf[TMPBUFLEN], *p;
2072         char __user *s = buffer;
2073         
2074         if (!tbl_data || !table->maxlen || !*lenp ||
2075             (*ppos && !write)) {
2076                 *lenp = 0;
2077                 return 0;
2078         }
2079         
2080         i = (int *) tbl_data;
2081         vleft = table->maxlen / sizeof(*i);
2082         left = *lenp;
2083
2084         if (!conv)
2085                 conv = do_proc_dointvec_conv;
2086
2087         for (; left && vleft--; i++, first=0) {
2088                 if (write) {
2089                         while (left) {
2090                                 char c;
2091                                 if (get_user(c, s))
2092                                         return -EFAULT;
2093                                 if (!isspace(c))
2094                                         break;
2095                                 left--;
2096                                 s++;
2097                         }
2098                         if (!left)
2099                                 break;
2100                         neg = 0;
2101                         len = left;
2102                         if (len > sizeof(buf) - 1)
2103                                 len = sizeof(buf) - 1;
2104                         if (copy_from_user(buf, s, len))
2105                                 return -EFAULT;
2106                         buf[len] = 0;
2107                         p = buf;
2108                         if (*p == '-' && left > 1) {
2109                                 neg = 1;
2110                                 p++;
2111                         }
2112                         if (*p < '0' || *p > '9')
2113                                 break;
2114
2115                         lval = simple_strtoul(p, &p, 0);
2116
2117                         len = p-buf;
2118                         if ((len < left) && *p && !isspace(*p))
2119                                 break;
2120                         s += len;
2121                         left -= len;
2122
2123                         if (conv(&neg, &lval, i, 1, data))
2124                                 break;
2125                 } else {
2126                         p = buf;
2127                         if (!first)
2128                                 *p++ = '\t';
2129         
2130                         if (conv(&neg, &lval, i, 0, data))
2131                                 break;
2132
2133                         sprintf(p, "%s%lu", neg ? "-" : "", lval);
2134                         len = strlen(buf);
2135                         if (len > left)
2136                                 len = left;
2137                         if(copy_to_user(s, buf, len))
2138                                 return -EFAULT;
2139                         left -= len;
2140                         s += len;
2141                 }
2142         }
2143
2144         if (!write && !first && left) {
2145                 if(put_user('\n', s))
2146                         return -EFAULT;
2147                 left--, s++;
2148         }
2149         if (write) {
2150                 while (left) {
2151                         char c;
2152                         if (get_user(c, s++))
2153                                 return -EFAULT;
2154                         if (!isspace(c))
2155                                 break;
2156                         left--;
2157                 }
2158         }
2159         if (write && first)
2160                 return -EINVAL;
2161         *lenp -= left;
2162         *ppos += *lenp;
2163         return 0;
2164 #undef TMPBUFLEN
2165 }
2166
2167 static int do_proc_dointvec(struct ctl_table *table, int write,
2168                   void __user *buffer, size_t *lenp, loff_t *ppos,
2169                   int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2170                               int write, void *data),
2171                   void *data)
2172 {
2173         return __do_proc_dointvec(table->data, table, write,
2174                         buffer, lenp, ppos, conv, data);
2175 }
2176
2177 /**
2178  * proc_dointvec - read a vector of integers
2179  * @table: the sysctl table
2180  * @write: %TRUE if this is a write to the sysctl file
2181  * @buffer: the user buffer
2182  * @lenp: the size of the user buffer
2183  * @ppos: file position
2184  *
2185  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2186  * values from/to the user buffer, treated as an ASCII string. 
2187  *
2188  * Returns 0 on success.
2189  */
2190 int proc_dointvec(struct ctl_table *table, int write,
2191                      void __user *buffer, size_t *lenp, loff_t *ppos)
2192 {
2193     return do_proc_dointvec(table,write,buffer,lenp,ppos,
2194                             NULL,NULL);
2195 }
2196
2197 /*
2198  * Taint values can only be increased
2199  * This means we can safely use a temporary.
2200  */
2201 static int proc_taint(struct ctl_table *table, int write,
2202                                void __user *buffer, size_t *lenp, loff_t *ppos)
2203 {
2204         struct ctl_table t;
2205         unsigned long tmptaint = get_taint();
2206         int err;
2207
2208         if (write && !capable(CAP_SYS_ADMIN))
2209                 return -EPERM;
2210
2211         t = *table;
2212         t.data = &tmptaint;
2213         err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2214         if (err < 0)
2215                 return err;
2216
2217         if (write) {
2218                 /*
2219                  * Poor man's atomic or. Not worth adding a primitive
2220                  * to everyone's atomic.h for this
2221                  */
2222                 int i;
2223                 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2224                         if ((tmptaint >> i) & 1)
2225                                 add_taint(i);
2226                 }
2227         }
2228
2229         return err;
2230 }
2231
2232 struct do_proc_dointvec_minmax_conv_param {
2233         int *min;
2234         int *max;
2235 };
2236
2237 static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp, 
2238                                         int *valp, 
2239                                         int write, void *data)
2240 {
2241         struct do_proc_dointvec_minmax_conv_param *param = data;
2242         if (write) {
2243                 int val = *negp ? -*lvalp : *lvalp;
2244                 if ((param->min && *param->min > val) ||
2245                     (param->max && *param->max < val))
2246                         return -EINVAL;
2247                 *valp = val;
2248         } else {
2249                 int val = *valp;
2250                 if (val < 0) {
2251                         *negp = -1;
2252                         *lvalp = (unsigned long)-val;
2253                 } else {
2254                         *negp = 0;
2255                         *lvalp = (unsigned long)val;
2256                 }
2257         }
2258         return 0;
2259 }
2260
2261 /**
2262  * proc_dointvec_minmax - read a vector of integers with min/max values
2263  * @table: the sysctl table
2264  * @write: %TRUE if this is a write to the sysctl file
2265  * @buffer: the user buffer
2266  * @lenp: the size of the user buffer
2267  * @ppos: file position
2268  *
2269  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2270  * values from/to the user buffer, treated as an ASCII string.
2271  *
2272  * This routine will ensure the values are within the range specified by
2273  * table->extra1 (min) and table->extra2 (max).
2274  *
2275  * Returns 0 on success.
2276  */
2277 int proc_dointvec_minmax(struct ctl_table *table, int write,
2278                   void __user *buffer, size_t *lenp, loff_t *ppos)
2279 {
2280         struct do_proc_dointvec_minmax_conv_param param = {
2281                 .min = (int *) table->extra1,
2282                 .max = (int *) table->extra2,
2283         };
2284         return do_proc_dointvec(table, write, buffer, lenp, ppos,
2285                                 do_proc_dointvec_minmax_conv, &param);
2286 }
2287
2288 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2289                                      void __user *buffer,
2290                                      size_t *lenp, loff_t *ppos,
2291                                      unsigned long convmul,
2292                                      unsigned long convdiv)
2293 {
2294 #define TMPBUFLEN 21
2295         unsigned long *i, *min, *max, val;
2296         int vleft, first=1, neg;
2297         size_t len, left;
2298         char buf[TMPBUFLEN], *p;
2299         char __user *s = buffer;
2300         
2301         if (!data || !table->maxlen || !*lenp ||
2302             (*ppos && !write)) {
2303                 *lenp = 0;
2304                 return 0;
2305         }
2306         
2307         i = (unsigned long *) data;
2308         min = (unsigned long *) table->extra1;
2309         max = (unsigned long *) table->extra2;
2310         vleft = table->maxlen / sizeof(unsigned long);
2311         left = *lenp;
2312         
2313         for (; left && vleft--; i++, min++, max++, first=0) {
2314                 if (write) {
2315                         while (left) {
2316                                 char c;
2317                                 if (get_user(c, s))
2318                                         return -EFAULT;
2319                                 if (!isspace(c))
2320                                         break;
2321                                 left--;
2322                                 s++;
2323                         }
2324                         if (!left)
2325                                 break;
2326                         neg = 0;
2327                         len = left;
2328                         if (len > TMPBUFLEN-1)
2329                                 len = TMPBUFLEN-1;
2330                         if (copy_from_user(buf, s, len))
2331                                 return -EFAULT;
2332                         buf[len] = 0;
2333                         p = buf;
2334                         if (*p == '-' && left > 1) {
2335                                 neg = 1;
2336                                 p++;
2337                         }
2338                         if (*p < '0' || *p > '9')
2339                                 break;
2340                         val = simple_strtoul(p, &p, 0) * convmul / convdiv ;
2341                         len = p-buf;
2342                         if ((len < left) && *p && !isspace(*p))
2343                                 break;
2344                         if (neg)
2345                                 val = -val;
2346                         s += len;
2347                         left -= len;
2348
2349                         if(neg)
2350                                 continue;
2351                         if ((min && val < *min) || (max && val > *max))
2352                                 continue;
2353                         *i = val;
2354                 } else {
2355                         p = buf;
2356                         if (!first)
2357                                 *p++ = '\t';
2358                         sprintf(p, "%lu", convdiv * (*i) / convmul);
2359                         len = strlen(buf);
2360                         if (len > left)
2361                                 len = left;
2362                         if(copy_to_user(s, buf, len))
2363                                 return -EFAULT;
2364                         left -= len;
2365                         s += len;
2366                 }
2367         }
2368
2369         if (!write && !first && left) {
2370                 if(put_user('\n', s))
2371                         return -EFAULT;
2372                 left--, s++;
2373         }
2374         if (write) {
2375                 while (left) {
2376                         char c;
2377                         if (get_user(c, s++))
2378                                 return -EFAULT;
2379                         if (!isspace(c))
2380                                 break;
2381                         left--;
2382                 }
2383         }
2384         if (write && first)
2385                 return -EINVAL;
2386         *lenp -= left;
2387         *ppos += *lenp;
2388         return 0;
2389 #undef TMPBUFLEN
2390 }
2391
2392 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2393                                      void __user *buffer,
2394                                      size_t *lenp, loff_t *ppos,
2395                                      unsigned long convmul,
2396                                      unsigned long convdiv)
2397 {
2398         return __do_proc_doulongvec_minmax(table->data, table, write,
2399                         buffer, lenp, ppos, convmul, convdiv);
2400 }
2401
2402 /**
2403  * proc_doulongvec_minmax - read a vector of long integers with min/max values
2404  * @table: the sysctl table
2405  * @write: %TRUE if this is a write to the sysctl file
2406  * @buffer: the user buffer
2407  * @lenp: the size of the user buffer
2408  * @ppos: file position
2409  *
2410  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2411  * values from/to the user buffer, treated as an ASCII string.
2412  *
2413  * This routine will ensure the values are within the range specified by
2414  * table->extra1 (min) and table->extra2 (max).
2415  *
2416  * Returns 0 on success.
2417  */
2418 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2419                            void __user *buffer, size_t *lenp, loff_t *ppos)
2420 {
2421     return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2422 }
2423
2424 /**
2425  * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2426  * @table: the sysctl table
2427  * @write: %TRUE if this is a write to the sysctl file
2428  * @buffer: the user buffer
2429  * @lenp: the size of the user buffer
2430  * @ppos: file position
2431  *
2432  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2433  * values from/to the user buffer, treated as an ASCII string. The values
2434  * are treated as milliseconds, and converted to jiffies when they are stored.
2435  *
2436  * This routine will ensure the values are within the range specified by
2437  * table->extra1 (min) and table->extra2 (max).
2438  *
2439  * Returns 0 on success.
2440  */
2441 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2442                                       void __user *buffer,
2443                                       size_t *lenp, loff_t *ppos)
2444 {
2445     return do_proc_doulongvec_minmax(table, write, buffer,
2446                                      lenp, ppos, HZ, 1000l);
2447 }
2448
2449
2450 static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp,
2451                                          int *valp,
2452                                          int write, void *data)
2453 {
2454         if (write) {
2455                 if (*lvalp > LONG_MAX / HZ)
2456                         return 1;
2457                 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2458         } else {
2459                 int val = *valp;
2460                 unsigned long lval;
2461                 if (val < 0) {
2462                         *negp = -1;
2463                         lval = (unsigned long)-val;
2464                 } else {
2465                         *negp = 0;
2466                         lval = (unsigned long)val;
2467                 }
2468                 *lvalp = lval / HZ;
2469         }
2470         return 0;
2471 }
2472
2473 static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp,
2474                                                 int *valp,
2475                                                 int write, void *data)
2476 {
2477         if (write) {
2478                 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2479                         return 1;
2480                 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2481         } else {
2482                 int val = *valp;
2483                 unsigned long lval;
2484                 if (val < 0) {
2485                         *negp = -1;
2486                         lval = (unsigned long)-val;
2487                 } else {
2488                         *negp = 0;
2489                         lval = (unsigned long)val;
2490                 }
2491                 *lvalp = jiffies_to_clock_t(lval);
2492         }
2493         return 0;
2494 }
2495
2496 static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp,
2497                                             int *valp,
2498                                             int write, void *data)
2499 {
2500         if (write) {
2501                 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2502         } else {
2503                 int val = *valp;
2504                 unsigned long lval;
2505                 if (val < 0) {
2506                         *negp = -1;
2507                         lval = (unsigned long)-val;
2508                 } else {
2509                         *negp = 0;
2510                         lval = (unsigned long)val;
2511                 }
2512                 *lvalp = jiffies_to_msecs(lval);
2513         }
2514         return 0;
2515 }
2516
2517 /**
2518  * proc_dointvec_jiffies - read a vector of integers as seconds
2519  * @table: the sysctl table
2520  * @write: %TRUE if this is a write to the sysctl file
2521  * @buffer: the user buffer
2522  * @lenp: the size of the user buffer
2523  * @ppos: file position
2524  *
2525  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2526  * values from/to the user buffer, treated as an ASCII string. 
2527  * The values read are assumed to be in seconds, and are converted into
2528  * jiffies.
2529  *
2530  * Returns 0 on success.
2531  */
2532 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2533                           void __user *buffer, size_t *lenp, loff_t *ppos)
2534 {
2535     return do_proc_dointvec(table,write,buffer,lenp,ppos,
2536                             do_proc_dointvec_jiffies_conv,NULL);
2537 }
2538
2539 /**
2540  * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2541  * @table: the sysctl table
2542  * @write: %TRUE if this is a write to the sysctl file
2543  * @buffer: the user buffer
2544  * @lenp: the size of the user buffer
2545  * @ppos: pointer to the file position
2546  *
2547  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2548  * values from/to the user buffer, treated as an ASCII string. 
2549  * The values read are assumed to be in 1/USER_HZ seconds, and 
2550  * are converted into jiffies.
2551  *
2552  * Returns 0 on success.
2553  */
2554 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2555                                  void __user *buffer, size_t *lenp, loff_t *ppos)
2556 {
2557     return do_proc_dointvec(table,write,buffer,lenp,ppos,
2558                             do_proc_dointvec_userhz_jiffies_conv,NULL);
2559 }
2560
2561 /**
2562  * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2563  * @table: the sysctl table
2564  * @write: %TRUE if this is a write to the sysctl file
2565  * @buffer: the user buffer
2566  * @lenp: the size of the user buffer
2567  * @ppos: file position
2568  * @ppos: the current position in the file
2569  *
2570  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2571  * values from/to the user buffer, treated as an ASCII string. 
2572  * The values read are assumed to be in 1/1000 seconds, and 
2573  * are converted into jiffies.
2574  *
2575  * Returns 0 on success.
2576  */
2577 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2578                              void __user *buffer, size_t *lenp, loff_t *ppos)
2579 {
2580         return do_proc_dointvec(table, write, buffer, lenp, ppos,
2581                                 do_proc_dointvec_ms_jiffies_conv, NULL);
2582 }
2583
2584 static int proc_do_cad_pid(struct ctl_table *table, int write,
2585                            void __user *buffer, size_t *lenp, loff_t *ppos)
2586 {
2587         struct pid *new_pid;
2588         pid_t tmp;
2589         int r;
2590
2591         tmp = pid_vnr(cad_pid);
2592
2593         r = __do_proc_dointvec(&tmp, table, write, buffer,
2594                                lenp, ppos, NULL, NULL);
2595         if (r || !write)
2596                 return r;
2597
2598         new_pid = find_get_pid(tmp);
2599         if (!new_pid)
2600                 return -ESRCH;
2601
2602         put_pid(xchg(&cad_pid, new_pid));
2603         return 0;
2604 }
2605
2606 #else /* CONFIG_PROC_FS */
2607
2608 int proc_dostring(struct ctl_table *table, int write,
2609                   void __user *buffer, size_t *lenp, loff_t *ppos)
2610 {
2611         return -ENOSYS;
2612 }
2613
2614 int proc_dointvec(struct ctl_table *table, int write,
2615                   void __user *buffer, size_t *lenp, loff_t *ppos)
2616 {
2617         return -ENOSYS;
2618 }
2619
2620 int proc_dointvec_minmax(struct ctl_table *table, int write,
2621                     void __user *buffer, size_t *lenp, loff_t *ppos)
2622 {
2623         return -ENOSYS;
2624 }
2625
2626 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2627                     void __user *buffer, size_t *lenp, loff_t *ppos)
2628 {
2629         return -ENOSYS;
2630 }
2631
2632 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2633                     void __user *buffer, size_t *lenp, loff_t *ppos)
2634 {
2635         return -ENOSYS;
2636 }
2637
2638 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2639                              void __user *buffer, size_t *lenp, loff_t *ppos)
2640 {
2641         return -ENOSYS;
2642 }
2643
2644 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2645                     void __user *buffer, size_t *lenp, loff_t *ppos)
2646 {
2647         return -ENOSYS;
2648 }
2649
2650 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2651                                       void __user *buffer,
2652                                       size_t *lenp, loff_t *ppos)
2653 {
2654     return -ENOSYS;
2655 }
2656
2657
2658 #endif /* CONFIG_PROC_FS */
2659
2660 /*
2661  * No sense putting this after each symbol definition, twice,
2662  * exception granted :-)
2663  */
2664 EXPORT_SYMBOL(proc_dointvec);
2665 EXPORT_SYMBOL(proc_dointvec_jiffies);
2666 EXPORT_SYMBOL(proc_dointvec_minmax);
2667 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2668 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2669 EXPORT_SYMBOL(proc_dostring);
2670 EXPORT_SYMBOL(proc_doulongvec_minmax);
2671 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
2672 EXPORT_SYMBOL(register_sysctl_table);
2673 EXPORT_SYMBOL(register_sysctl_paths);
2674 EXPORT_SYMBOL(unregister_sysctl_table);