Merge branch 'for-next' into for-linus
[linux-2.6.git] / kernel / sysctl.c
1 /*
2  * sysctl.c: General linux system control interface
3  *
4  * Begun 24 March 1995, Stephen Tweedie
5  * Added /proc support, Dec 1995
6  * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
7  * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
8  * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
9  * Dynamic registration fixes, Stephen Tweedie.
10  * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
11  * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
12  *  Horn.
13  * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
14  * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
15  * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
16  *  Wendling.
17  * The list_for_each() macro wasn't appropriate for the sysctl loop.
18  *  Removed it and replaced it with older style, 03/23/00, Bill Wendling
19  */
20
21 #include <linux/module.h>
22 #include <linux/mm.h>
23 #include <linux/swap.h>
24 #include <linux/slab.h>
25 #include <linux/sysctl.h>
26 #include <linux/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 #include <linux/kprobes.h>
54
55 #include <asm/uaccess.h>
56 #include <asm/processor.h>
57
58 #ifdef CONFIG_X86
59 #include <asm/nmi.h>
60 #include <asm/stacktrace.h>
61 #include <asm/io.h>
62 #endif
63
64
65 #if defined(CONFIG_SYSCTL)
66
67 /* External variables not in a header file. */
68 extern int C_A_D;
69 extern int print_fatal_signals;
70 extern int sysctl_overcommit_memory;
71 extern int sysctl_overcommit_ratio;
72 extern int sysctl_panic_on_oom;
73 extern int sysctl_oom_kill_allocating_task;
74 extern int sysctl_oom_dump_tasks;
75 extern int max_threads;
76 extern int core_uses_pid;
77 extern int suid_dumpable;
78 extern char core_pattern[];
79 extern unsigned int core_pipe_limit;
80 extern int pid_max;
81 extern int min_free_kbytes;
82 extern int pid_max_min, pid_max_max;
83 extern int sysctl_drop_caches;
84 extern int percpu_pagelist_fraction;
85 extern int compat_log;
86 extern int latencytop_enabled;
87 extern int sysctl_nr_open_min, sysctl_nr_open_max;
88 #ifndef CONFIG_MMU
89 extern int sysctl_nr_trim_pages;
90 #endif
91 #ifdef CONFIG_RCU_TORTURE_TEST
92 extern int rcutorture_runnable;
93 #endif /* #ifdef CONFIG_RCU_TORTURE_TEST */
94 #ifdef CONFIG_BLOCK
95 extern int blk_iopoll_enabled;
96 #endif
97
98 /* Constants used for minimum and  maximum */
99 #ifdef CONFIG_DETECT_SOFTLOCKUP
100 static int sixty = 60;
101 static int neg_one = -1;
102 #endif
103
104 static int zero;
105 static int __maybe_unused one = 1;
106 static int __maybe_unused two = 2;
107 static unsigned long one_ul = 1;
108 static int one_hundred = 100;
109 #ifdef CONFIG_PRINTK
110 static int ten_thousand = 10000;
111 #endif
112
113 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
114 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
115
116 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
117 static int maxolduid = 65535;
118 static int minolduid;
119 static int min_percpu_pagelist_fract = 8;
120
121 static int ngroups_max = NGROUPS_MAX;
122
123 #ifdef CONFIG_MODULES
124 extern char modprobe_path[];
125 extern int modules_disabled;
126 #endif
127 #ifdef CONFIG_CHR_DEV_SG
128 extern int sg_big_buff;
129 #endif
130
131 #ifdef CONFIG_SPARC
132 #include <asm/system.h>
133 #endif
134
135 #ifdef CONFIG_SPARC64
136 extern int sysctl_tsb_ratio;
137 #endif
138
139 #ifdef __hppa__
140 extern int pwrsw_enabled;
141 extern int unaligned_enabled;
142 #endif
143
144 #ifdef CONFIG_S390
145 #ifdef CONFIG_MATHEMU
146 extern int sysctl_ieee_emulation_warnings;
147 #endif
148 extern int sysctl_userprocess_debug;
149 extern int spin_retry;
150 #endif
151
152 #ifdef CONFIG_BSD_PROCESS_ACCT
153 extern int acct_parm[];
154 #endif
155
156 #ifdef CONFIG_IA64
157 extern int no_unaligned_warning;
158 extern int unaligned_dump_stack;
159 #endif
160
161 extern struct ratelimit_state printk_ratelimit_state;
162
163 #ifdef CONFIG_RT_MUTEXES
164 extern int max_lock_depth;
165 #endif
166
167 #ifdef CONFIG_PROC_SYSCTL
168 static int proc_do_cad_pid(struct ctl_table *table, int write,
169                   void __user *buffer, size_t *lenp, loff_t *ppos);
170 static int proc_taint(struct ctl_table *table, int write,
171                                void __user *buffer, size_t *lenp, loff_t *ppos);
172 #endif
173
174 static struct ctl_table root_table[];
175 static struct ctl_table_root sysctl_table_root;
176 static struct ctl_table_header root_table_header = {
177         .count = 1,
178         .ctl_table = root_table,
179         .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.default_set.list),
180         .root = &sysctl_table_root,
181         .set = &sysctl_table_root.default_set,
182 };
183 static struct ctl_table_root sysctl_table_root = {
184         .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list),
185         .default_set.list = LIST_HEAD_INIT(root_table_header.ctl_entry),
186 };
187
188 static struct ctl_table kern_table[];
189 static struct ctl_table vm_table[];
190 static struct ctl_table fs_table[];
191 static struct ctl_table debug_table[];
192 static struct ctl_table dev_table[];
193 extern struct ctl_table random_table[];
194 #ifdef CONFIG_INOTIFY_USER
195 extern struct ctl_table inotify_table[];
196 #endif
197 #ifdef CONFIG_EPOLL
198 extern struct ctl_table epoll_table[];
199 #endif
200
201 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
202 int sysctl_legacy_va_layout;
203 #endif
204
205 extern int prove_locking;
206 extern int lock_stat;
207
208 /* The default sysctl tables: */
209
210 static struct ctl_table root_table[] = {
211         {
212                 .procname       = "kernel",
213                 .mode           = 0555,
214                 .child          = kern_table,
215         },
216         {
217                 .procname       = "vm",
218                 .mode           = 0555,
219                 .child          = vm_table,
220         },
221         {
222                 .procname       = "fs",
223                 .mode           = 0555,
224                 .child          = fs_table,
225         },
226         {
227                 .procname       = "debug",
228                 .mode           = 0555,
229                 .child          = debug_table,
230         },
231         {
232                 .procname       = "dev",
233                 .mode           = 0555,
234                 .child          = dev_table,
235         },
236 /*
237  * NOTE: do not add new entries to this table unless you have read
238  * Documentation/sysctl/ctl_unnumbered.txt
239  */
240         { }
241 };
242
243 #ifdef CONFIG_SCHED_DEBUG
244 static int min_sched_granularity_ns = 100000;           /* 100 usecs */
245 static int max_sched_granularity_ns = NSEC_PER_SEC;     /* 1 second */
246 static int min_wakeup_granularity_ns;                   /* 0 usecs */
247 static int max_wakeup_granularity_ns = NSEC_PER_SEC;    /* 1 second */
248 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
249 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
250 static int min_sched_shares_ratelimit = 100000; /* 100 usec */
251 static int max_sched_shares_ratelimit = NSEC_PER_SEC; /* 1 second */
252 #endif
253
254 static struct ctl_table kern_table[] = {
255         {
256                 .procname       = "sched_child_runs_first",
257                 .data           = &sysctl_sched_child_runs_first,
258                 .maxlen         = sizeof(unsigned int),
259                 .mode           = 0644,
260                 .proc_handler   = proc_dointvec,
261         },
262 #ifdef CONFIG_SCHED_DEBUG
263         {
264                 .procname       = "sched_min_granularity_ns",
265                 .data           = &sysctl_sched_min_granularity,
266                 .maxlen         = sizeof(unsigned int),
267                 .mode           = 0644,
268                 .proc_handler   = sched_proc_update_handler,
269                 .extra1         = &min_sched_granularity_ns,
270                 .extra2         = &max_sched_granularity_ns,
271         },
272         {
273                 .procname       = "sched_latency_ns",
274                 .data           = &sysctl_sched_latency,
275                 .maxlen         = sizeof(unsigned int),
276                 .mode           = 0644,
277                 .proc_handler   = sched_proc_update_handler,
278                 .extra1         = &min_sched_granularity_ns,
279                 .extra2         = &max_sched_granularity_ns,
280         },
281         {
282                 .procname       = "sched_wakeup_granularity_ns",
283                 .data           = &sysctl_sched_wakeup_granularity,
284                 .maxlen         = sizeof(unsigned int),
285                 .mode           = 0644,
286                 .proc_handler   = sched_proc_update_handler,
287                 .extra1         = &min_wakeup_granularity_ns,
288                 .extra2         = &max_wakeup_granularity_ns,
289         },
290         {
291                 .procname       = "sched_shares_ratelimit",
292                 .data           = &sysctl_sched_shares_ratelimit,
293                 .maxlen         = sizeof(unsigned int),
294                 .mode           = 0644,
295                 .proc_handler   = sched_proc_update_handler,
296                 .extra1         = &min_sched_shares_ratelimit,
297                 .extra2         = &max_sched_shares_ratelimit,
298         },
299         {
300                 .procname       = "sched_tunable_scaling",
301                 .data           = &sysctl_sched_tunable_scaling,
302                 .maxlen         = sizeof(enum sched_tunable_scaling),
303                 .mode           = 0644,
304                 .proc_handler   = sched_proc_update_handler,
305                 .extra1         = &min_sched_tunable_scaling,
306                 .extra2         = &max_sched_tunable_scaling,
307         },
308         {
309                 .procname       = "sched_shares_thresh",
310                 .data           = &sysctl_sched_shares_thresh,
311                 .maxlen         = sizeof(unsigned int),
312                 .mode           = 0644,
313                 .proc_handler   = proc_dointvec_minmax,
314                 .extra1         = &zero,
315         },
316         {
317                 .procname       = "sched_migration_cost",
318                 .data           = &sysctl_sched_migration_cost,
319                 .maxlen         = sizeof(unsigned int),
320                 .mode           = 0644,
321                 .proc_handler   = proc_dointvec,
322         },
323         {
324                 .procname       = "sched_nr_migrate",
325                 .data           = &sysctl_sched_nr_migrate,
326                 .maxlen         = sizeof(unsigned int),
327                 .mode           = 0644,
328                 .proc_handler   = proc_dointvec,
329         },
330         {
331                 .procname       = "sched_time_avg",
332                 .data           = &sysctl_sched_time_avg,
333                 .maxlen         = sizeof(unsigned int),
334                 .mode           = 0644,
335                 .proc_handler   = proc_dointvec,
336         },
337         {
338                 .procname       = "timer_migration",
339                 .data           = &sysctl_timer_migration,
340                 .maxlen         = sizeof(unsigned int),
341                 .mode           = 0644,
342                 .proc_handler   = proc_dointvec_minmax,
343                 .extra1         = &zero,
344                 .extra2         = &one,
345         },
346 #endif
347         {
348                 .procname       = "sched_rt_period_us",
349                 .data           = &sysctl_sched_rt_period,
350                 .maxlen         = sizeof(unsigned int),
351                 .mode           = 0644,
352                 .proc_handler   = sched_rt_handler,
353         },
354         {
355                 .procname       = "sched_rt_runtime_us",
356                 .data           = &sysctl_sched_rt_runtime,
357                 .maxlen         = sizeof(int),
358                 .mode           = 0644,
359                 .proc_handler   = sched_rt_handler,
360         },
361         {
362                 .procname       = "sched_compat_yield",
363                 .data           = &sysctl_sched_compat_yield,
364                 .maxlen         = sizeof(unsigned int),
365                 .mode           = 0644,
366                 .proc_handler   = proc_dointvec,
367         },
368 #ifdef CONFIG_PROVE_LOCKING
369         {
370                 .procname       = "prove_locking",
371                 .data           = &prove_locking,
372                 .maxlen         = sizeof(int),
373                 .mode           = 0644,
374                 .proc_handler   = proc_dointvec,
375         },
376 #endif
377 #ifdef CONFIG_LOCK_STAT
378         {
379                 .procname       = "lock_stat",
380                 .data           = &lock_stat,
381                 .maxlen         = sizeof(int),
382                 .mode           = 0644,
383                 .proc_handler   = proc_dointvec,
384         },
385 #endif
386         {
387                 .procname       = "panic",
388                 .data           = &panic_timeout,
389                 .maxlen         = sizeof(int),
390                 .mode           = 0644,
391                 .proc_handler   = proc_dointvec,
392         },
393         {
394                 .procname       = "core_uses_pid",
395                 .data           = &core_uses_pid,
396                 .maxlen         = sizeof(int),
397                 .mode           = 0644,
398                 .proc_handler   = proc_dointvec,
399         },
400         {
401                 .procname       = "core_pattern",
402                 .data           = core_pattern,
403                 .maxlen         = CORENAME_MAX_SIZE,
404                 .mode           = 0644,
405                 .proc_handler   = proc_dostring,
406         },
407         {
408                 .procname       = "core_pipe_limit",
409                 .data           = &core_pipe_limit,
410                 .maxlen         = sizeof(unsigned int),
411                 .mode           = 0644,
412                 .proc_handler   = proc_dointvec,
413         },
414 #ifdef CONFIG_PROC_SYSCTL
415         {
416                 .procname       = "tainted",
417                 .maxlen         = sizeof(long),
418                 .mode           = 0644,
419                 .proc_handler   = proc_taint,
420         },
421 #endif
422 #ifdef CONFIG_LATENCYTOP
423         {
424                 .procname       = "latencytop",
425                 .data           = &latencytop_enabled,
426                 .maxlen         = sizeof(int),
427                 .mode           = 0644,
428                 .proc_handler   = proc_dointvec,
429         },
430 #endif
431 #ifdef CONFIG_BLK_DEV_INITRD
432         {
433                 .procname       = "real-root-dev",
434                 .data           = &real_root_dev,
435                 .maxlen         = sizeof(int),
436                 .mode           = 0644,
437                 .proc_handler   = proc_dointvec,
438         },
439 #endif
440         {
441                 .procname       = "print-fatal-signals",
442                 .data           = &print_fatal_signals,
443                 .maxlen         = sizeof(int),
444                 .mode           = 0644,
445                 .proc_handler   = proc_dointvec,
446         },
447 #ifdef CONFIG_SPARC
448         {
449                 .procname       = "reboot-cmd",
450                 .data           = reboot_command,
451                 .maxlen         = 256,
452                 .mode           = 0644,
453                 .proc_handler   = proc_dostring,
454         },
455         {
456                 .procname       = "stop-a",
457                 .data           = &stop_a_enabled,
458                 .maxlen         = sizeof (int),
459                 .mode           = 0644,
460                 .proc_handler   = proc_dointvec,
461         },
462         {
463                 .procname       = "scons-poweroff",
464                 .data           = &scons_pwroff,
465                 .maxlen         = sizeof (int),
466                 .mode           = 0644,
467                 .proc_handler   = proc_dointvec,
468         },
469 #endif
470 #ifdef CONFIG_SPARC64
471         {
472                 .procname       = "tsb-ratio",
473                 .data           = &sysctl_tsb_ratio,
474                 .maxlen         = sizeof (int),
475                 .mode           = 0644,
476                 .proc_handler   = proc_dointvec,
477         },
478 #endif
479 #ifdef __hppa__
480         {
481                 .procname       = "soft-power",
482                 .data           = &pwrsw_enabled,
483                 .maxlen         = sizeof (int),
484                 .mode           = 0644,
485                 .proc_handler   = proc_dointvec,
486         },
487         {
488                 .procname       = "unaligned-trap",
489                 .data           = &unaligned_enabled,
490                 .maxlen         = sizeof (int),
491                 .mode           = 0644,
492                 .proc_handler   = proc_dointvec,
493         },
494 #endif
495         {
496                 .procname       = "ctrl-alt-del",
497                 .data           = &C_A_D,
498                 .maxlen         = sizeof(int),
499                 .mode           = 0644,
500                 .proc_handler   = proc_dointvec,
501         },
502 #ifdef CONFIG_FUNCTION_TRACER
503         {
504                 .procname       = "ftrace_enabled",
505                 .data           = &ftrace_enabled,
506                 .maxlen         = sizeof(int),
507                 .mode           = 0644,
508                 .proc_handler   = ftrace_enable_sysctl,
509         },
510 #endif
511 #ifdef CONFIG_STACK_TRACER
512         {
513                 .procname       = "stack_tracer_enabled",
514                 .data           = &stack_tracer_enabled,
515                 .maxlen         = sizeof(int),
516                 .mode           = 0644,
517                 .proc_handler   = stack_trace_sysctl,
518         },
519 #endif
520 #ifdef CONFIG_TRACING
521         {
522                 .procname       = "ftrace_dump_on_oops",
523                 .data           = &ftrace_dump_on_oops,
524                 .maxlen         = sizeof(int),
525                 .mode           = 0644,
526                 .proc_handler   = proc_dointvec,
527         },
528 #endif
529 #ifdef CONFIG_MODULES
530         {
531                 .procname       = "modprobe",
532                 .data           = &modprobe_path,
533                 .maxlen         = KMOD_PATH_LEN,
534                 .mode           = 0644,
535                 .proc_handler   = proc_dostring,
536         },
537         {
538                 .procname       = "modules_disabled",
539                 .data           = &modules_disabled,
540                 .maxlen         = sizeof(int),
541                 .mode           = 0644,
542                 /* only handle a transition from default "0" to "1" */
543                 .proc_handler   = proc_dointvec_minmax,
544                 .extra1         = &one,
545                 .extra2         = &one,
546         },
547 #endif
548 #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
549         {
550                 .procname       = "hotplug",
551                 .data           = &uevent_helper,
552                 .maxlen         = UEVENT_HELPER_PATH_LEN,
553                 .mode           = 0644,
554                 .proc_handler   = proc_dostring,
555         },
556 #endif
557 #ifdef CONFIG_CHR_DEV_SG
558         {
559                 .procname       = "sg-big-buff",
560                 .data           = &sg_big_buff,
561                 .maxlen         = sizeof (int),
562                 .mode           = 0444,
563                 .proc_handler   = proc_dointvec,
564         },
565 #endif
566 #ifdef CONFIG_BSD_PROCESS_ACCT
567         {
568                 .procname       = "acct",
569                 .data           = &acct_parm,
570                 .maxlen         = 3*sizeof(int),
571                 .mode           = 0644,
572                 .proc_handler   = proc_dointvec,
573         },
574 #endif
575 #ifdef CONFIG_MAGIC_SYSRQ
576         {
577                 .procname       = "sysrq",
578                 .data           = &__sysrq_enabled,
579                 .maxlen         = sizeof (int),
580                 .mode           = 0644,
581                 .proc_handler   = proc_dointvec,
582         },
583 #endif
584 #ifdef CONFIG_PROC_SYSCTL
585         {
586                 .procname       = "cad_pid",
587                 .data           = NULL,
588                 .maxlen         = sizeof (int),
589                 .mode           = 0600,
590                 .proc_handler   = proc_do_cad_pid,
591         },
592 #endif
593         {
594                 .procname       = "threads-max",
595                 .data           = &max_threads,
596                 .maxlen         = sizeof(int),
597                 .mode           = 0644,
598                 .proc_handler   = proc_dointvec,
599         },
600         {
601                 .procname       = "random",
602                 .mode           = 0555,
603                 .child          = random_table,
604         },
605         {
606                 .procname       = "overflowuid",
607                 .data           = &overflowuid,
608                 .maxlen         = sizeof(int),
609                 .mode           = 0644,
610                 .proc_handler   = proc_dointvec_minmax,
611                 .extra1         = &minolduid,
612                 .extra2         = &maxolduid,
613         },
614         {
615                 .procname       = "overflowgid",
616                 .data           = &overflowgid,
617                 .maxlen         = sizeof(int),
618                 .mode           = 0644,
619                 .proc_handler   = proc_dointvec_minmax,
620                 .extra1         = &minolduid,
621                 .extra2         = &maxolduid,
622         },
623 #ifdef CONFIG_S390
624 #ifdef CONFIG_MATHEMU
625         {
626                 .procname       = "ieee_emulation_warnings",
627                 .data           = &sysctl_ieee_emulation_warnings,
628                 .maxlen         = sizeof(int),
629                 .mode           = 0644,
630                 .proc_handler   = proc_dointvec,
631         },
632 #endif
633         {
634                 .procname       = "userprocess_debug",
635                 .data           = &sysctl_userprocess_debug,
636                 .maxlen         = sizeof(int),
637                 .mode           = 0644,
638                 .proc_handler   = proc_dointvec,
639         },
640 #endif
641         {
642                 .procname       = "pid_max",
643                 .data           = &pid_max,
644                 .maxlen         = sizeof (int),
645                 .mode           = 0644,
646                 .proc_handler   = proc_dointvec_minmax,
647                 .extra1         = &pid_max_min,
648                 .extra2         = &pid_max_max,
649         },
650         {
651                 .procname       = "panic_on_oops",
652                 .data           = &panic_on_oops,
653                 .maxlen         = sizeof(int),
654                 .mode           = 0644,
655                 .proc_handler   = proc_dointvec,
656         },
657 #if defined CONFIG_PRINTK
658         {
659                 .procname       = "printk",
660                 .data           = &console_loglevel,
661                 .maxlen         = 4*sizeof(int),
662                 .mode           = 0644,
663                 .proc_handler   = proc_dointvec,
664         },
665         {
666                 .procname       = "printk_ratelimit",
667                 .data           = &printk_ratelimit_state.interval,
668                 .maxlen         = sizeof(int),
669                 .mode           = 0644,
670                 .proc_handler   = proc_dointvec_jiffies,
671         },
672         {
673                 .procname       = "printk_ratelimit_burst",
674                 .data           = &printk_ratelimit_state.burst,
675                 .maxlen         = sizeof(int),
676                 .mode           = 0644,
677                 .proc_handler   = proc_dointvec,
678         },
679         {
680                 .procname       = "printk_delay",
681                 .data           = &printk_delay_msec,
682                 .maxlen         = sizeof(int),
683                 .mode           = 0644,
684                 .proc_handler   = proc_dointvec_minmax,
685                 .extra1         = &zero,
686                 .extra2         = &ten_thousand,
687         },
688 #endif
689         {
690                 .procname       = "ngroups_max",
691                 .data           = &ngroups_max,
692                 .maxlen         = sizeof (int),
693                 .mode           = 0444,
694                 .proc_handler   = proc_dointvec,
695         },
696 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
697         {
698                 .procname       = "unknown_nmi_panic",
699                 .data           = &unknown_nmi_panic,
700                 .maxlen         = sizeof (int),
701                 .mode           = 0644,
702                 .proc_handler   = proc_dointvec,
703         },
704         {
705                 .procname       = "nmi_watchdog",
706                 .data           = &nmi_watchdog_enabled,
707                 .maxlen         = sizeof (int),
708                 .mode           = 0644,
709                 .proc_handler   = proc_nmi_enabled,
710         },
711 #endif
712 #if defined(CONFIG_X86)
713         {
714                 .procname       = "panic_on_unrecovered_nmi",
715                 .data           = &panic_on_unrecovered_nmi,
716                 .maxlen         = sizeof(int),
717                 .mode           = 0644,
718                 .proc_handler   = proc_dointvec,
719         },
720         {
721                 .procname       = "panic_on_io_nmi",
722                 .data           = &panic_on_io_nmi,
723                 .maxlen         = sizeof(int),
724                 .mode           = 0644,
725                 .proc_handler   = proc_dointvec,
726         },
727         {
728                 .procname       = "bootloader_type",
729                 .data           = &bootloader_type,
730                 .maxlen         = sizeof (int),
731                 .mode           = 0444,
732                 .proc_handler   = proc_dointvec,
733         },
734         {
735                 .procname       = "bootloader_version",
736                 .data           = &bootloader_version,
737                 .maxlen         = sizeof (int),
738                 .mode           = 0444,
739                 .proc_handler   = proc_dointvec,
740         },
741         {
742                 .procname       = "kstack_depth_to_print",
743                 .data           = &kstack_depth_to_print,
744                 .maxlen         = sizeof(int),
745                 .mode           = 0644,
746                 .proc_handler   = proc_dointvec,
747         },
748         {
749                 .procname       = "io_delay_type",
750                 .data           = &io_delay_type,
751                 .maxlen         = sizeof(int),
752                 .mode           = 0644,
753                 .proc_handler   = proc_dointvec,
754         },
755 #endif
756 #if defined(CONFIG_MMU)
757         {
758                 .procname       = "randomize_va_space",
759                 .data           = &randomize_va_space,
760                 .maxlen         = sizeof(int),
761                 .mode           = 0644,
762                 .proc_handler   = proc_dointvec,
763         },
764 #endif
765 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
766         {
767                 .procname       = "spin_retry",
768                 .data           = &spin_retry,
769                 .maxlen         = sizeof (int),
770                 .mode           = 0644,
771                 .proc_handler   = proc_dointvec,
772         },
773 #endif
774 #if     defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
775         {
776                 .procname       = "acpi_video_flags",
777                 .data           = &acpi_realmode_flags,
778                 .maxlen         = sizeof (unsigned long),
779                 .mode           = 0644,
780                 .proc_handler   = proc_doulongvec_minmax,
781         },
782 #endif
783 #ifdef CONFIG_IA64
784         {
785                 .procname       = "ignore-unaligned-usertrap",
786                 .data           = &no_unaligned_warning,
787                 .maxlen         = sizeof (int),
788                 .mode           = 0644,
789                 .proc_handler   = proc_dointvec,
790         },
791         {
792                 .procname       = "unaligned-dump-stack",
793                 .data           = &unaligned_dump_stack,
794                 .maxlen         = sizeof (int),
795                 .mode           = 0644,
796                 .proc_handler   = proc_dointvec,
797         },
798 #endif
799 #ifdef CONFIG_DETECT_SOFTLOCKUP
800         {
801                 .procname       = "softlockup_panic",
802                 .data           = &softlockup_panic,
803                 .maxlen         = sizeof(int),
804                 .mode           = 0644,
805                 .proc_handler   = proc_dointvec_minmax,
806                 .extra1         = &zero,
807                 .extra2         = &one,
808         },
809         {
810                 .procname       = "softlockup_thresh",
811                 .data           = &softlockup_thresh,
812                 .maxlen         = sizeof(int),
813                 .mode           = 0644,
814                 .proc_handler   = proc_dosoftlockup_thresh,
815                 .extra1         = &neg_one,
816                 .extra2         = &sixty,
817         },
818 #endif
819 #ifdef CONFIG_DETECT_HUNG_TASK
820         {
821                 .procname       = "hung_task_panic",
822                 .data           = &sysctl_hung_task_panic,
823                 .maxlen         = sizeof(int),
824                 .mode           = 0644,
825                 .proc_handler   = proc_dointvec_minmax,
826                 .extra1         = &zero,
827                 .extra2         = &one,
828         },
829         {
830                 .procname       = "hung_task_check_count",
831                 .data           = &sysctl_hung_task_check_count,
832                 .maxlen         = sizeof(unsigned long),
833                 .mode           = 0644,
834                 .proc_handler   = proc_doulongvec_minmax,
835         },
836         {
837                 .procname       = "hung_task_timeout_secs",
838                 .data           = &sysctl_hung_task_timeout_secs,
839                 .maxlen         = sizeof(unsigned long),
840                 .mode           = 0644,
841                 .proc_handler   = proc_dohung_task_timeout_secs,
842         },
843         {
844                 .procname       = "hung_task_warnings",
845                 .data           = &sysctl_hung_task_warnings,
846                 .maxlen         = sizeof(unsigned long),
847                 .mode           = 0644,
848                 .proc_handler   = proc_doulongvec_minmax,
849         },
850 #endif
851 #ifdef CONFIG_COMPAT
852         {
853                 .procname       = "compat-log",
854                 .data           = &compat_log,
855                 .maxlen         = sizeof (int),
856                 .mode           = 0644,
857                 .proc_handler   = proc_dointvec,
858         },
859 #endif
860 #ifdef CONFIG_RT_MUTEXES
861         {
862                 .procname       = "max_lock_depth",
863                 .data           = &max_lock_depth,
864                 .maxlen         = sizeof(int),
865                 .mode           = 0644,
866                 .proc_handler   = proc_dointvec,
867         },
868 #endif
869         {
870                 .procname       = "poweroff_cmd",
871                 .data           = &poweroff_cmd,
872                 .maxlen         = POWEROFF_CMD_PATH_LEN,
873                 .mode           = 0644,
874                 .proc_handler   = proc_dostring,
875         },
876 #ifdef CONFIG_KEYS
877         {
878                 .procname       = "keys",
879                 .mode           = 0555,
880                 .child          = key_sysctls,
881         },
882 #endif
883 #ifdef CONFIG_RCU_TORTURE_TEST
884         {
885                 .procname       = "rcutorture_runnable",
886                 .data           = &rcutorture_runnable,
887                 .maxlen         = sizeof(int),
888                 .mode           = 0644,
889                 .proc_handler   = proc_dointvec,
890         },
891 #endif
892 #ifdef CONFIG_SLOW_WORK
893         {
894                 .procname       = "slow-work",
895                 .mode           = 0555,
896                 .child          = slow_work_sysctls,
897         },
898 #endif
899 #ifdef CONFIG_PERF_EVENTS
900         {
901                 .procname       = "perf_event_paranoid",
902                 .data           = &sysctl_perf_event_paranoid,
903                 .maxlen         = sizeof(sysctl_perf_event_paranoid),
904                 .mode           = 0644,
905                 .proc_handler   = proc_dointvec,
906         },
907         {
908                 .procname       = "perf_event_mlock_kb",
909                 .data           = &sysctl_perf_event_mlock,
910                 .maxlen         = sizeof(sysctl_perf_event_mlock),
911                 .mode           = 0644,
912                 .proc_handler   = proc_dointvec,
913         },
914         {
915                 .procname       = "perf_event_max_sample_rate",
916                 .data           = &sysctl_perf_event_sample_rate,
917                 .maxlen         = sizeof(sysctl_perf_event_sample_rate),
918                 .mode           = 0644,
919                 .proc_handler   = proc_dointvec,
920         },
921 #endif
922 #ifdef CONFIG_KMEMCHECK
923         {
924                 .procname       = "kmemcheck",
925                 .data           = &kmemcheck_enabled,
926                 .maxlen         = sizeof(int),
927                 .mode           = 0644,
928                 .proc_handler   = proc_dointvec,
929         },
930 #endif
931 #ifdef CONFIG_BLOCK
932         {
933                 .procname       = "blk_iopoll",
934                 .data           = &blk_iopoll_enabled,
935                 .maxlen         = sizeof(int),
936                 .mode           = 0644,
937                 .proc_handler   = proc_dointvec,
938         },
939 #endif
940 /*
941  * NOTE: do not add new entries to this table unless you have read
942  * Documentation/sysctl/ctl_unnumbered.txt
943  */
944         { }
945 };
946
947 static struct ctl_table vm_table[] = {
948         {
949                 .procname       = "overcommit_memory",
950                 .data           = &sysctl_overcommit_memory,
951                 .maxlen         = sizeof(sysctl_overcommit_memory),
952                 .mode           = 0644,
953                 .proc_handler   = proc_dointvec,
954         },
955         {
956                 .procname       = "panic_on_oom",
957                 .data           = &sysctl_panic_on_oom,
958                 .maxlen         = sizeof(sysctl_panic_on_oom),
959                 .mode           = 0644,
960                 .proc_handler   = proc_dointvec,
961         },
962         {
963                 .procname       = "oom_kill_allocating_task",
964                 .data           = &sysctl_oom_kill_allocating_task,
965                 .maxlen         = sizeof(sysctl_oom_kill_allocating_task),
966                 .mode           = 0644,
967                 .proc_handler   = proc_dointvec,
968         },
969         {
970                 .procname       = "oom_dump_tasks",
971                 .data           = &sysctl_oom_dump_tasks,
972                 .maxlen         = sizeof(sysctl_oom_dump_tasks),
973                 .mode           = 0644,
974                 .proc_handler   = proc_dointvec,
975         },
976         {
977                 .procname       = "overcommit_ratio",
978                 .data           = &sysctl_overcommit_ratio,
979                 .maxlen         = sizeof(sysctl_overcommit_ratio),
980                 .mode           = 0644,
981                 .proc_handler   = proc_dointvec,
982         },
983         {
984                 .procname       = "page-cluster", 
985                 .data           = &page_cluster,
986                 .maxlen         = sizeof(int),
987                 .mode           = 0644,
988                 .proc_handler   = proc_dointvec,
989         },
990         {
991                 .procname       = "dirty_background_ratio",
992                 .data           = &dirty_background_ratio,
993                 .maxlen         = sizeof(dirty_background_ratio),
994                 .mode           = 0644,
995                 .proc_handler   = dirty_background_ratio_handler,
996                 .extra1         = &zero,
997                 .extra2         = &one_hundred,
998         },
999         {
1000                 .procname       = "dirty_background_bytes",
1001                 .data           = &dirty_background_bytes,
1002                 .maxlen         = sizeof(dirty_background_bytes),
1003                 .mode           = 0644,
1004                 .proc_handler   = dirty_background_bytes_handler,
1005                 .extra1         = &one_ul,
1006         },
1007         {
1008                 .procname       = "dirty_ratio",
1009                 .data           = &vm_dirty_ratio,
1010                 .maxlen         = sizeof(vm_dirty_ratio),
1011                 .mode           = 0644,
1012                 .proc_handler   = dirty_ratio_handler,
1013                 .extra1         = &zero,
1014                 .extra2         = &one_hundred,
1015         },
1016         {
1017                 .procname       = "dirty_bytes",
1018                 .data           = &vm_dirty_bytes,
1019                 .maxlen         = sizeof(vm_dirty_bytes),
1020                 .mode           = 0644,
1021                 .proc_handler   = dirty_bytes_handler,
1022                 .extra1         = &dirty_bytes_min,
1023         },
1024         {
1025                 .procname       = "dirty_writeback_centisecs",
1026                 .data           = &dirty_writeback_interval,
1027                 .maxlen         = sizeof(dirty_writeback_interval),
1028                 .mode           = 0644,
1029                 .proc_handler   = dirty_writeback_centisecs_handler,
1030         },
1031         {
1032                 .procname       = "dirty_expire_centisecs",
1033                 .data           = &dirty_expire_interval,
1034                 .maxlen         = sizeof(dirty_expire_interval),
1035                 .mode           = 0644,
1036                 .proc_handler   = proc_dointvec,
1037         },
1038         {
1039                 .procname       = "nr_pdflush_threads",
1040                 .data           = &nr_pdflush_threads,
1041                 .maxlen         = sizeof nr_pdflush_threads,
1042                 .mode           = 0444 /* read-only*/,
1043                 .proc_handler   = proc_dointvec,
1044         },
1045         {
1046                 .procname       = "swappiness",
1047                 .data           = &vm_swappiness,
1048                 .maxlen         = sizeof(vm_swappiness),
1049                 .mode           = 0644,
1050                 .proc_handler   = proc_dointvec_minmax,
1051                 .extra1         = &zero,
1052                 .extra2         = &one_hundred,
1053         },
1054 #ifdef CONFIG_HUGETLB_PAGE
1055         {
1056                 .procname       = "nr_hugepages",
1057                 .data           = NULL,
1058                 .maxlen         = sizeof(unsigned long),
1059                 .mode           = 0644,
1060                 .proc_handler   = hugetlb_sysctl_handler,
1061                 .extra1         = (void *)&hugetlb_zero,
1062                 .extra2         = (void *)&hugetlb_infinity,
1063         },
1064 #ifdef CONFIG_NUMA
1065         {
1066                 .procname       = "nr_hugepages_mempolicy",
1067                 .data           = NULL,
1068                 .maxlen         = sizeof(unsigned long),
1069                 .mode           = 0644,
1070                 .proc_handler   = &hugetlb_mempolicy_sysctl_handler,
1071                 .extra1         = (void *)&hugetlb_zero,
1072                 .extra2         = (void *)&hugetlb_infinity,
1073         },
1074 #endif
1075          {
1076                 .procname       = "hugetlb_shm_group",
1077                 .data           = &sysctl_hugetlb_shm_group,
1078                 .maxlen         = sizeof(gid_t),
1079                 .mode           = 0644,
1080                 .proc_handler   = proc_dointvec,
1081          },
1082          {
1083                 .procname       = "hugepages_treat_as_movable",
1084                 .data           = &hugepages_treat_as_movable,
1085                 .maxlen         = sizeof(int),
1086                 .mode           = 0644,
1087                 .proc_handler   = hugetlb_treat_movable_handler,
1088         },
1089         {
1090                 .procname       = "nr_overcommit_hugepages",
1091                 .data           = NULL,
1092                 .maxlen         = sizeof(unsigned long),
1093                 .mode           = 0644,
1094                 .proc_handler   = hugetlb_overcommit_handler,
1095                 .extra1         = (void *)&hugetlb_zero,
1096                 .extra2         = (void *)&hugetlb_infinity,
1097         },
1098 #endif
1099         {
1100                 .procname       = "lowmem_reserve_ratio",
1101                 .data           = &sysctl_lowmem_reserve_ratio,
1102                 .maxlen         = sizeof(sysctl_lowmem_reserve_ratio),
1103                 .mode           = 0644,
1104                 .proc_handler   = lowmem_reserve_ratio_sysctl_handler,
1105         },
1106         {
1107                 .procname       = "drop_caches",
1108                 .data           = &sysctl_drop_caches,
1109                 .maxlen         = sizeof(int),
1110                 .mode           = 0644,
1111                 .proc_handler   = drop_caches_sysctl_handler,
1112         },
1113         {
1114                 .procname       = "min_free_kbytes",
1115                 .data           = &min_free_kbytes,
1116                 .maxlen         = sizeof(min_free_kbytes),
1117                 .mode           = 0644,
1118                 .proc_handler   = min_free_kbytes_sysctl_handler,
1119                 .extra1         = &zero,
1120         },
1121         {
1122                 .procname       = "percpu_pagelist_fraction",
1123                 .data           = &percpu_pagelist_fraction,
1124                 .maxlen         = sizeof(percpu_pagelist_fraction),
1125                 .mode           = 0644,
1126                 .proc_handler   = percpu_pagelist_fraction_sysctl_handler,
1127                 .extra1         = &min_percpu_pagelist_fract,
1128         },
1129 #ifdef CONFIG_MMU
1130         {
1131                 .procname       = "max_map_count",
1132                 .data           = &sysctl_max_map_count,
1133                 .maxlen         = sizeof(sysctl_max_map_count),
1134                 .mode           = 0644,
1135                 .proc_handler   = proc_dointvec_minmax,
1136                 .extra1         = &zero,
1137         },
1138 #else
1139         {
1140                 .procname       = "nr_trim_pages",
1141                 .data           = &sysctl_nr_trim_pages,
1142                 .maxlen         = sizeof(sysctl_nr_trim_pages),
1143                 .mode           = 0644,
1144                 .proc_handler   = proc_dointvec_minmax,
1145                 .extra1         = &zero,
1146         },
1147 #endif
1148         {
1149                 .procname       = "laptop_mode",
1150                 .data           = &laptop_mode,
1151                 .maxlen         = sizeof(laptop_mode),
1152                 .mode           = 0644,
1153                 .proc_handler   = proc_dointvec_jiffies,
1154         },
1155         {
1156                 .procname       = "block_dump",
1157                 .data           = &block_dump,
1158                 .maxlen         = sizeof(block_dump),
1159                 .mode           = 0644,
1160                 .proc_handler   = proc_dointvec,
1161                 .extra1         = &zero,
1162         },
1163         {
1164                 .procname       = "vfs_cache_pressure",
1165                 .data           = &sysctl_vfs_cache_pressure,
1166                 .maxlen         = sizeof(sysctl_vfs_cache_pressure),
1167                 .mode           = 0644,
1168                 .proc_handler   = proc_dointvec,
1169                 .extra1         = &zero,
1170         },
1171 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1172         {
1173                 .procname       = "legacy_va_layout",
1174                 .data           = &sysctl_legacy_va_layout,
1175                 .maxlen         = sizeof(sysctl_legacy_va_layout),
1176                 .mode           = 0644,
1177                 .proc_handler   = proc_dointvec,
1178                 .extra1         = &zero,
1179         },
1180 #endif
1181 #ifdef CONFIG_NUMA
1182         {
1183                 .procname       = "zone_reclaim_mode",
1184                 .data           = &zone_reclaim_mode,
1185                 .maxlen         = sizeof(zone_reclaim_mode),
1186                 .mode           = 0644,
1187                 .proc_handler   = proc_dointvec,
1188                 .extra1         = &zero,
1189         },
1190         {
1191                 .procname       = "min_unmapped_ratio",
1192                 .data           = &sysctl_min_unmapped_ratio,
1193                 .maxlen         = sizeof(sysctl_min_unmapped_ratio),
1194                 .mode           = 0644,
1195                 .proc_handler   = sysctl_min_unmapped_ratio_sysctl_handler,
1196                 .extra1         = &zero,
1197                 .extra2         = &one_hundred,
1198         },
1199         {
1200                 .procname       = "min_slab_ratio",
1201                 .data           = &sysctl_min_slab_ratio,
1202                 .maxlen         = sizeof(sysctl_min_slab_ratio),
1203                 .mode           = 0644,
1204                 .proc_handler   = sysctl_min_slab_ratio_sysctl_handler,
1205                 .extra1         = &zero,
1206                 .extra2         = &one_hundred,
1207         },
1208 #endif
1209 #ifdef CONFIG_SMP
1210         {
1211                 .procname       = "stat_interval",
1212                 .data           = &sysctl_stat_interval,
1213                 .maxlen         = sizeof(sysctl_stat_interval),
1214                 .mode           = 0644,
1215                 .proc_handler   = proc_dointvec_jiffies,
1216         },
1217 #endif
1218 #ifdef CONFIG_MMU
1219         {
1220                 .procname       = "mmap_min_addr",
1221                 .data           = &dac_mmap_min_addr,
1222                 .maxlen         = sizeof(unsigned long),
1223                 .mode           = 0644,
1224                 .proc_handler   = mmap_min_addr_handler,
1225         },
1226 #endif
1227 #ifdef CONFIG_NUMA
1228         {
1229                 .procname       = "numa_zonelist_order",
1230                 .data           = &numa_zonelist_order,
1231                 .maxlen         = NUMA_ZONELIST_ORDER_LEN,
1232                 .mode           = 0644,
1233                 .proc_handler   = numa_zonelist_order_handler,
1234         },
1235 #endif
1236 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1237    (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1238         {
1239                 .procname       = "vdso_enabled",
1240                 .data           = &vdso_enabled,
1241                 .maxlen         = sizeof(vdso_enabled),
1242                 .mode           = 0644,
1243                 .proc_handler   = proc_dointvec,
1244                 .extra1         = &zero,
1245         },
1246 #endif
1247 #ifdef CONFIG_HIGHMEM
1248         {
1249                 .procname       = "highmem_is_dirtyable",
1250                 .data           = &vm_highmem_is_dirtyable,
1251                 .maxlen         = sizeof(vm_highmem_is_dirtyable),
1252                 .mode           = 0644,
1253                 .proc_handler   = proc_dointvec_minmax,
1254                 .extra1         = &zero,
1255                 .extra2         = &one,
1256         },
1257 #endif
1258         {
1259                 .procname       = "scan_unevictable_pages",
1260                 .data           = &scan_unevictable_pages,
1261                 .maxlen         = sizeof(scan_unevictable_pages),
1262                 .mode           = 0644,
1263                 .proc_handler   = scan_unevictable_handler,
1264         },
1265 #ifdef CONFIG_MEMORY_FAILURE
1266         {
1267                 .procname       = "memory_failure_early_kill",
1268                 .data           = &sysctl_memory_failure_early_kill,
1269                 .maxlen         = sizeof(sysctl_memory_failure_early_kill),
1270                 .mode           = 0644,
1271                 .proc_handler   = proc_dointvec_minmax,
1272                 .extra1         = &zero,
1273                 .extra2         = &one,
1274         },
1275         {
1276                 .procname       = "memory_failure_recovery",
1277                 .data           = &sysctl_memory_failure_recovery,
1278                 .maxlen         = sizeof(sysctl_memory_failure_recovery),
1279                 .mode           = 0644,
1280                 .proc_handler   = proc_dointvec_minmax,
1281                 .extra1         = &zero,
1282                 .extra2         = &one,
1283         },
1284 #endif
1285
1286 /*
1287  * NOTE: do not add new entries to this table unless you have read
1288  * Documentation/sysctl/ctl_unnumbered.txt
1289  */
1290         { }
1291 };
1292
1293 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1294 static struct ctl_table binfmt_misc_table[] = {
1295         { }
1296 };
1297 #endif
1298
1299 static struct ctl_table fs_table[] = {
1300         {
1301                 .procname       = "inode-nr",
1302                 .data           = &inodes_stat,
1303                 .maxlen         = 2*sizeof(int),
1304                 .mode           = 0444,
1305                 .proc_handler   = proc_dointvec,
1306         },
1307         {
1308                 .procname       = "inode-state",
1309                 .data           = &inodes_stat,
1310                 .maxlen         = 7*sizeof(int),
1311                 .mode           = 0444,
1312                 .proc_handler   = proc_dointvec,
1313         },
1314         {
1315                 .procname       = "file-nr",
1316                 .data           = &files_stat,
1317                 .maxlen         = 3*sizeof(int),
1318                 .mode           = 0444,
1319                 .proc_handler   = proc_nr_files,
1320         },
1321         {
1322                 .procname       = "file-max",
1323                 .data           = &files_stat.max_files,
1324                 .maxlen         = sizeof(int),
1325                 .mode           = 0644,
1326                 .proc_handler   = proc_dointvec,
1327         },
1328         {
1329                 .procname       = "nr_open",
1330                 .data           = &sysctl_nr_open,
1331                 .maxlen         = sizeof(int),
1332                 .mode           = 0644,
1333                 .proc_handler   = proc_dointvec_minmax,
1334                 .extra1         = &sysctl_nr_open_min,
1335                 .extra2         = &sysctl_nr_open_max,
1336         },
1337         {
1338                 .procname       = "dentry-state",
1339                 .data           = &dentry_stat,
1340                 .maxlen         = 6*sizeof(int),
1341                 .mode           = 0444,
1342                 .proc_handler   = proc_dointvec,
1343         },
1344         {
1345                 .procname       = "overflowuid",
1346                 .data           = &fs_overflowuid,
1347                 .maxlen         = sizeof(int),
1348                 .mode           = 0644,
1349                 .proc_handler   = proc_dointvec_minmax,
1350                 .extra1         = &minolduid,
1351                 .extra2         = &maxolduid,
1352         },
1353         {
1354                 .procname       = "overflowgid",
1355                 .data           = &fs_overflowgid,
1356                 .maxlen         = sizeof(int),
1357                 .mode           = 0644,
1358                 .proc_handler   = proc_dointvec_minmax,
1359                 .extra1         = &minolduid,
1360                 .extra2         = &maxolduid,
1361         },
1362 #ifdef CONFIG_FILE_LOCKING
1363         {
1364                 .procname       = "leases-enable",
1365                 .data           = &leases_enable,
1366                 .maxlen         = sizeof(int),
1367                 .mode           = 0644,
1368                 .proc_handler   = proc_dointvec,
1369         },
1370 #endif
1371 #ifdef CONFIG_DNOTIFY
1372         {
1373                 .procname       = "dir-notify-enable",
1374                 .data           = &dir_notify_enable,
1375                 .maxlen         = sizeof(int),
1376                 .mode           = 0644,
1377                 .proc_handler   = proc_dointvec,
1378         },
1379 #endif
1380 #ifdef CONFIG_MMU
1381 #ifdef CONFIG_FILE_LOCKING
1382         {
1383                 .procname       = "lease-break-time",
1384                 .data           = &lease_break_time,
1385                 .maxlen         = sizeof(int),
1386                 .mode           = 0644,
1387                 .proc_handler   = proc_dointvec,
1388         },
1389 #endif
1390 #ifdef CONFIG_AIO
1391         {
1392                 .procname       = "aio-nr",
1393                 .data           = &aio_nr,
1394                 .maxlen         = sizeof(aio_nr),
1395                 .mode           = 0444,
1396                 .proc_handler   = proc_doulongvec_minmax,
1397         },
1398         {
1399                 .procname       = "aio-max-nr",
1400                 .data           = &aio_max_nr,
1401                 .maxlen         = sizeof(aio_max_nr),
1402                 .mode           = 0644,
1403                 .proc_handler   = proc_doulongvec_minmax,
1404         },
1405 #endif /* CONFIG_AIO */
1406 #ifdef CONFIG_INOTIFY_USER
1407         {
1408                 .procname       = "inotify",
1409                 .mode           = 0555,
1410                 .child          = inotify_table,
1411         },
1412 #endif  
1413 #ifdef CONFIG_EPOLL
1414         {
1415                 .procname       = "epoll",
1416                 .mode           = 0555,
1417                 .child          = epoll_table,
1418         },
1419 #endif
1420 #endif
1421         {
1422                 .procname       = "suid_dumpable",
1423                 .data           = &suid_dumpable,
1424                 .maxlen         = sizeof(int),
1425                 .mode           = 0644,
1426                 .proc_handler   = proc_dointvec_minmax,
1427                 .extra1         = &zero,
1428                 .extra2         = &two,
1429         },
1430 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1431         {
1432                 .procname       = "binfmt_misc",
1433                 .mode           = 0555,
1434                 .child          = binfmt_misc_table,
1435         },
1436 #endif
1437 /*
1438  * NOTE: do not add new entries to this table unless you have read
1439  * Documentation/sysctl/ctl_unnumbered.txt
1440  */
1441         { }
1442 };
1443
1444 static struct ctl_table debug_table[] = {
1445 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_SPARC)
1446         {
1447                 .procname       = "exception-trace",
1448                 .data           = &show_unhandled_signals,
1449                 .maxlen         = sizeof(int),
1450                 .mode           = 0644,
1451                 .proc_handler   = proc_dointvec
1452         },
1453 #endif
1454 #if defined(CONFIG_OPTPROBES)
1455         {
1456                 .procname       = "kprobes-optimization",
1457                 .data           = &sysctl_kprobes_optimization,
1458                 .maxlen         = sizeof(int),
1459                 .mode           = 0644,
1460                 .proc_handler   = proc_kprobes_optimization_handler,
1461                 .extra1         = &zero,
1462                 .extra2         = &one,
1463         },
1464 #endif
1465         { }
1466 };
1467
1468 static struct ctl_table dev_table[] = {
1469         { }
1470 };
1471
1472 static DEFINE_SPINLOCK(sysctl_lock);
1473
1474 /* called under sysctl_lock */
1475 static int use_table(struct ctl_table_header *p)
1476 {
1477         if (unlikely(p->unregistering))
1478                 return 0;
1479         p->used++;
1480         return 1;
1481 }
1482
1483 /* called under sysctl_lock */
1484 static void unuse_table(struct ctl_table_header *p)
1485 {
1486         if (!--p->used)
1487                 if (unlikely(p->unregistering))
1488                         complete(p->unregistering);
1489 }
1490
1491 /* called under sysctl_lock, will reacquire if has to wait */
1492 static void start_unregistering(struct ctl_table_header *p)
1493 {
1494         /*
1495          * if p->used is 0, nobody will ever touch that entry again;
1496          * we'll eliminate all paths to it before dropping sysctl_lock
1497          */
1498         if (unlikely(p->used)) {
1499                 struct completion wait;
1500                 init_completion(&wait);
1501                 p->unregistering = &wait;
1502                 spin_unlock(&sysctl_lock);
1503                 wait_for_completion(&wait);
1504                 spin_lock(&sysctl_lock);
1505         } else {
1506                 /* anything non-NULL; we'll never dereference it */
1507                 p->unregistering = ERR_PTR(-EINVAL);
1508         }
1509         /*
1510          * do not remove from the list until nobody holds it; walking the
1511          * list in do_sysctl() relies on that.
1512          */
1513         list_del_init(&p->ctl_entry);
1514 }
1515
1516 void sysctl_head_get(struct ctl_table_header *head)
1517 {
1518         spin_lock(&sysctl_lock);
1519         head->count++;
1520         spin_unlock(&sysctl_lock);
1521 }
1522
1523 void sysctl_head_put(struct ctl_table_header *head)
1524 {
1525         spin_lock(&sysctl_lock);
1526         if (!--head->count)
1527                 kfree(head);
1528         spin_unlock(&sysctl_lock);
1529 }
1530
1531 struct ctl_table_header *sysctl_head_grab(struct ctl_table_header *head)
1532 {
1533         if (!head)
1534                 BUG();
1535         spin_lock(&sysctl_lock);
1536         if (!use_table(head))
1537                 head = ERR_PTR(-ENOENT);
1538         spin_unlock(&sysctl_lock);
1539         return head;
1540 }
1541
1542 void sysctl_head_finish(struct ctl_table_header *head)
1543 {
1544         if (!head)
1545                 return;
1546         spin_lock(&sysctl_lock);
1547         unuse_table(head);
1548         spin_unlock(&sysctl_lock);
1549 }
1550
1551 static struct ctl_table_set *
1552 lookup_header_set(struct ctl_table_root *root, struct nsproxy *namespaces)
1553 {
1554         struct ctl_table_set *set = &root->default_set;
1555         if (root->lookup)
1556                 set = root->lookup(root, namespaces);
1557         return set;
1558 }
1559
1560 static struct list_head *
1561 lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces)
1562 {
1563         struct ctl_table_set *set = lookup_header_set(root, namespaces);
1564         return &set->list;
1565 }
1566
1567 struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces,
1568                                             struct ctl_table_header *prev)
1569 {
1570         struct ctl_table_root *root;
1571         struct list_head *header_list;
1572         struct ctl_table_header *head;
1573         struct list_head *tmp;
1574
1575         spin_lock(&sysctl_lock);
1576         if (prev) {
1577                 head = prev;
1578                 tmp = &prev->ctl_entry;
1579                 unuse_table(prev);
1580                 goto next;
1581         }
1582         tmp = &root_table_header.ctl_entry;
1583         for (;;) {
1584                 head = list_entry(tmp, struct ctl_table_header, ctl_entry);
1585
1586                 if (!use_table(head))
1587                         goto next;
1588                 spin_unlock(&sysctl_lock);
1589                 return head;
1590         next:
1591                 root = head->root;
1592                 tmp = tmp->next;
1593                 header_list = lookup_header_list(root, namespaces);
1594                 if (tmp != header_list)
1595                         continue;
1596
1597                 do {
1598                         root = list_entry(root->root_list.next,
1599                                         struct ctl_table_root, root_list);
1600                         if (root == &sysctl_table_root)
1601                                 goto out;
1602                         header_list = lookup_header_list(root, namespaces);
1603                 } while (list_empty(header_list));
1604                 tmp = header_list->next;
1605         }
1606 out:
1607         spin_unlock(&sysctl_lock);
1608         return NULL;
1609 }
1610
1611 struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev)
1612 {
1613         return __sysctl_head_next(current->nsproxy, prev);
1614 }
1615
1616 void register_sysctl_root(struct ctl_table_root *root)
1617 {
1618         spin_lock(&sysctl_lock);
1619         list_add_tail(&root->root_list, &sysctl_table_root.root_list);
1620         spin_unlock(&sysctl_lock);
1621 }
1622
1623 /*
1624  * sysctl_perm does NOT grant the superuser all rights automatically, because
1625  * some sysctl variables are readonly even to root.
1626  */
1627
1628 static int test_perm(int mode, int op)
1629 {
1630         if (!current_euid())
1631                 mode >>= 6;
1632         else if (in_egroup_p(0))
1633                 mode >>= 3;
1634         if ((op & ~mode & (MAY_READ|MAY_WRITE|MAY_EXEC)) == 0)
1635                 return 0;
1636         return -EACCES;
1637 }
1638
1639 int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op)
1640 {
1641         int error;
1642         int mode;
1643
1644         error = security_sysctl(table, op & (MAY_READ | MAY_WRITE | MAY_EXEC));
1645         if (error)
1646                 return error;
1647
1648         if (root->permissions)
1649                 mode = root->permissions(root, current->nsproxy, table);
1650         else
1651                 mode = table->mode;
1652
1653         return test_perm(mode, op);
1654 }
1655
1656 static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table)
1657 {
1658         for (; table->procname; table++) {
1659                 table->parent = parent;
1660                 if (table->child)
1661                         sysctl_set_parent(table, table->child);
1662         }
1663 }
1664
1665 static __init int sysctl_init(void)
1666 {
1667         sysctl_set_parent(NULL, root_table);
1668 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1669         {
1670                 int err;
1671                 err = sysctl_check_table(current->nsproxy, root_table);
1672         }
1673 #endif
1674         return 0;
1675 }
1676
1677 core_initcall(sysctl_init);
1678
1679 static struct ctl_table *is_branch_in(struct ctl_table *branch,
1680                                       struct ctl_table *table)
1681 {
1682         struct ctl_table *p;
1683         const char *s = branch->procname;
1684
1685         /* branch should have named subdirectory as its first element */
1686         if (!s || !branch->child)
1687                 return NULL;
1688
1689         /* ... and nothing else */
1690         if (branch[1].procname)
1691                 return NULL;
1692
1693         /* table should contain subdirectory with the same name */
1694         for (p = table; p->procname; p++) {
1695                 if (!p->child)
1696                         continue;
1697                 if (p->procname && strcmp(p->procname, s) == 0)
1698                         return p;
1699         }
1700         return NULL;
1701 }
1702
1703 /* see if attaching q to p would be an improvement */
1704 static void try_attach(struct ctl_table_header *p, struct ctl_table_header *q)
1705 {
1706         struct ctl_table *to = p->ctl_table, *by = q->ctl_table;
1707         struct ctl_table *next;
1708         int is_better = 0;
1709         int not_in_parent = !p->attached_by;
1710
1711         while ((next = is_branch_in(by, to)) != NULL) {
1712                 if (by == q->attached_by)
1713                         is_better = 1;
1714                 if (to == p->attached_by)
1715                         not_in_parent = 1;
1716                 by = by->child;
1717                 to = next->child;
1718         }
1719
1720         if (is_better && not_in_parent) {
1721                 q->attached_by = by;
1722                 q->attached_to = to;
1723                 q->parent = p;
1724         }
1725 }
1726
1727 /**
1728  * __register_sysctl_paths - register a sysctl hierarchy
1729  * @root: List of sysctl headers to register on
1730  * @namespaces: Data to compute which lists of sysctl entries are visible
1731  * @path: The path to the directory the sysctl table is in.
1732  * @table: the top-level table structure
1733  *
1734  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1735  * array. A completely 0 filled entry terminates the table.
1736  *
1737  * The members of the &struct ctl_table structure are used as follows:
1738  *
1739  * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1740  *            enter a sysctl file
1741  *
1742  * data - a pointer to data for use by proc_handler
1743  *
1744  * maxlen - the maximum size in bytes of the data
1745  *
1746  * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1747  *
1748  * child - a pointer to the child sysctl table if this entry is a directory, or
1749  *         %NULL.
1750  *
1751  * proc_handler - the text handler routine (described below)
1752  *
1753  * de - for internal use by the sysctl routines
1754  *
1755  * extra1, extra2 - extra pointers usable by the proc handler routines
1756  *
1757  * Leaf nodes in the sysctl tree will be represented by a single file
1758  * under /proc; non-leaf nodes will be represented by directories.
1759  *
1760  * sysctl(2) can automatically manage read and write requests through
1761  * the sysctl table.  The data and maxlen fields of the ctl_table
1762  * struct enable minimal validation of the values being written to be
1763  * performed, and the mode field allows minimal authentication.
1764  *
1765  * There must be a proc_handler routine for any terminal nodes
1766  * mirrored under /proc/sys (non-terminals are handled by a built-in
1767  * directory handler).  Several default handlers are available to
1768  * cover common cases -
1769  *
1770  * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1771  * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(), 
1772  * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1773  *
1774  * It is the handler's job to read the input buffer from user memory
1775  * and process it. The handler should return 0 on success.
1776  *
1777  * This routine returns %NULL on a failure to register, and a pointer
1778  * to the table header on success.
1779  */
1780 struct ctl_table_header *__register_sysctl_paths(
1781         struct ctl_table_root *root,
1782         struct nsproxy *namespaces,
1783         const struct ctl_path *path, struct ctl_table *table)
1784 {
1785         struct ctl_table_header *header;
1786         struct ctl_table *new, **prevp;
1787         unsigned int n, npath;
1788         struct ctl_table_set *set;
1789
1790         /* Count the path components */
1791         for (npath = 0; path[npath].procname; ++npath)
1792                 ;
1793
1794         /*
1795          * For each path component, allocate a 2-element ctl_table array.
1796          * The first array element will be filled with the sysctl entry
1797          * for this, the second will be the sentinel (procname == 0).
1798          *
1799          * We allocate everything in one go so that we don't have to
1800          * worry about freeing additional memory in unregister_sysctl_table.
1801          */
1802         header = kzalloc(sizeof(struct ctl_table_header) +
1803                          (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL);
1804         if (!header)
1805                 return NULL;
1806
1807         new = (struct ctl_table *) (header + 1);
1808
1809         /* Now connect the dots */
1810         prevp = &header->ctl_table;
1811         for (n = 0; n < npath; ++n, ++path) {
1812                 /* Copy the procname */
1813                 new->procname = path->procname;
1814                 new->mode     = 0555;
1815
1816                 *prevp = new;
1817                 prevp = &new->child;
1818
1819                 new += 2;
1820         }
1821         *prevp = table;
1822         header->ctl_table_arg = table;
1823
1824         INIT_LIST_HEAD(&header->ctl_entry);
1825         header->used = 0;
1826         header->unregistering = NULL;
1827         header->root = root;
1828         sysctl_set_parent(NULL, header->ctl_table);
1829         header->count = 1;
1830 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1831         if (sysctl_check_table(namespaces, header->ctl_table)) {
1832                 kfree(header);
1833                 return NULL;
1834         }
1835 #endif
1836         spin_lock(&sysctl_lock);
1837         header->set = lookup_header_set(root, namespaces);
1838         header->attached_by = header->ctl_table;
1839         header->attached_to = root_table;
1840         header->parent = &root_table_header;
1841         for (set = header->set; set; set = set->parent) {
1842                 struct ctl_table_header *p;
1843                 list_for_each_entry(p, &set->list, ctl_entry) {
1844                         if (p->unregistering)
1845                                 continue;
1846                         try_attach(p, header);
1847                 }
1848         }
1849         header->parent->count++;
1850         list_add_tail(&header->ctl_entry, &header->set->list);
1851         spin_unlock(&sysctl_lock);
1852
1853         return header;
1854 }
1855
1856 /**
1857  * register_sysctl_table_path - register a sysctl table hierarchy
1858  * @path: The path to the directory the sysctl table is in.
1859  * @table: the top-level table structure
1860  *
1861  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1862  * array. A completely 0 filled entry terminates the table.
1863  *
1864  * See __register_sysctl_paths for more details.
1865  */
1866 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1867                                                 struct ctl_table *table)
1868 {
1869         return __register_sysctl_paths(&sysctl_table_root, current->nsproxy,
1870                                         path, table);
1871 }
1872
1873 /**
1874  * register_sysctl_table - register a sysctl table hierarchy
1875  * @table: the top-level table structure
1876  *
1877  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1878  * array. A completely 0 filled entry terminates the table.
1879  *
1880  * See register_sysctl_paths for more details.
1881  */
1882 struct ctl_table_header *register_sysctl_table(struct ctl_table *table)
1883 {
1884         static const struct ctl_path null_path[] = { {} };
1885
1886         return register_sysctl_paths(null_path, table);
1887 }
1888
1889 /**
1890  * unregister_sysctl_table - unregister a sysctl table hierarchy
1891  * @header: the header returned from register_sysctl_table
1892  *
1893  * Unregisters the sysctl table and all children. proc entries may not
1894  * actually be removed until they are no longer used by anyone.
1895  */
1896 void unregister_sysctl_table(struct ctl_table_header * header)
1897 {
1898         might_sleep();
1899
1900         if (header == NULL)
1901                 return;
1902
1903         spin_lock(&sysctl_lock);
1904         start_unregistering(header);
1905         if (!--header->parent->count) {
1906                 WARN_ON(1);
1907                 kfree(header->parent);
1908         }
1909         if (!--header->count)
1910                 kfree(header);
1911         spin_unlock(&sysctl_lock);
1912 }
1913
1914 int sysctl_is_seen(struct ctl_table_header *p)
1915 {
1916         struct ctl_table_set *set = p->set;
1917         int res;
1918         spin_lock(&sysctl_lock);
1919         if (p->unregistering)
1920                 res = 0;
1921         else if (!set->is_seen)
1922                 res = 1;
1923         else
1924                 res = set->is_seen(set);
1925         spin_unlock(&sysctl_lock);
1926         return res;
1927 }
1928
1929 void setup_sysctl_set(struct ctl_table_set *p,
1930         struct ctl_table_set *parent,
1931         int (*is_seen)(struct ctl_table_set *))
1932 {
1933         INIT_LIST_HEAD(&p->list);
1934         p->parent = parent ? parent : &sysctl_table_root.default_set;
1935         p->is_seen = is_seen;
1936 }
1937
1938 #else /* !CONFIG_SYSCTL */
1939 struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
1940 {
1941         return NULL;
1942 }
1943
1944 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1945                                                     struct ctl_table *table)
1946 {
1947         return NULL;
1948 }
1949
1950 void unregister_sysctl_table(struct ctl_table_header * table)
1951 {
1952 }
1953
1954 void setup_sysctl_set(struct ctl_table_set *p,
1955         struct ctl_table_set *parent,
1956         int (*is_seen)(struct ctl_table_set *))
1957 {
1958 }
1959
1960 void sysctl_head_put(struct ctl_table_header *head)
1961 {
1962 }
1963
1964 #endif /* CONFIG_SYSCTL */
1965
1966 /*
1967  * /proc/sys support
1968  */
1969
1970 #ifdef CONFIG_PROC_SYSCTL
1971
1972 static int _proc_do_string(void* data, int maxlen, int write,
1973                            void __user *buffer,
1974                            size_t *lenp, loff_t *ppos)
1975 {
1976         size_t len;
1977         char __user *p;
1978         char c;
1979
1980         if (!data || !maxlen || !*lenp) {
1981                 *lenp = 0;
1982                 return 0;
1983         }
1984
1985         if (write) {
1986                 len = 0;
1987                 p = buffer;
1988                 while (len < *lenp) {
1989                         if (get_user(c, p++))
1990                                 return -EFAULT;
1991                         if (c == 0 || c == '\n')
1992                                 break;
1993                         len++;
1994                 }
1995                 if (len >= maxlen)
1996                         len = maxlen-1;
1997                 if(copy_from_user(data, buffer, len))
1998                         return -EFAULT;
1999                 ((char *) data)[len] = 0;
2000                 *ppos += *lenp;
2001         } else {
2002                 len = strlen(data);
2003                 if (len > maxlen)
2004                         len = maxlen;
2005
2006                 if (*ppos > len) {
2007                         *lenp = 0;
2008                         return 0;
2009                 }
2010
2011                 data += *ppos;
2012                 len  -= *ppos;
2013
2014                 if (len > *lenp)
2015                         len = *lenp;
2016                 if (len)
2017                         if(copy_to_user(buffer, data, len))
2018                                 return -EFAULT;
2019                 if (len < *lenp) {
2020                         if(put_user('\n', ((char __user *) buffer) + len))
2021                                 return -EFAULT;
2022                         len++;
2023                 }
2024                 *lenp = len;
2025                 *ppos += len;
2026         }
2027         return 0;
2028 }
2029
2030 /**
2031  * proc_dostring - read a string sysctl
2032  * @table: the sysctl table
2033  * @write: %TRUE if this is a write to the sysctl file
2034  * @buffer: the user buffer
2035  * @lenp: the size of the user buffer
2036  * @ppos: file position
2037  *
2038  * Reads/writes a string from/to the user buffer. If the kernel
2039  * buffer provided is not large enough to hold the string, the
2040  * string is truncated. The copied string is %NULL-terminated.
2041  * If the string is being read by the user process, it is copied
2042  * and a newline '\n' is added. It is truncated if the buffer is
2043  * not large enough.
2044  *
2045  * Returns 0 on success.
2046  */
2047 int proc_dostring(struct ctl_table *table, int write,
2048                   void __user *buffer, size_t *lenp, loff_t *ppos)
2049 {
2050         return _proc_do_string(table->data, table->maxlen, write,
2051                                buffer, lenp, ppos);
2052 }
2053
2054
2055 static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp,
2056                                  int *valp,
2057                                  int write, void *data)
2058 {
2059         if (write) {
2060                 *valp = *negp ? -*lvalp : *lvalp;
2061         } else {
2062                 int val = *valp;
2063                 if (val < 0) {
2064                         *negp = -1;
2065                         *lvalp = (unsigned long)-val;
2066                 } else {
2067                         *negp = 0;
2068                         *lvalp = (unsigned long)val;
2069                 }
2070         }
2071         return 0;
2072 }
2073
2074 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
2075                   int write, void __user *buffer,
2076                   size_t *lenp, loff_t *ppos,
2077                   int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2078                               int write, void *data),
2079                   void *data)
2080 {
2081 #define TMPBUFLEN 21
2082         int *i, vleft, first = 1, neg;
2083         unsigned long lval;
2084         size_t left, len;
2085         
2086         char buf[TMPBUFLEN], *p;
2087         char __user *s = buffer;
2088         
2089         if (!tbl_data || !table->maxlen || !*lenp ||
2090             (*ppos && !write)) {
2091                 *lenp = 0;
2092                 return 0;
2093         }
2094         
2095         i = (int *) tbl_data;
2096         vleft = table->maxlen / sizeof(*i);
2097         left = *lenp;
2098
2099         if (!conv)
2100                 conv = do_proc_dointvec_conv;
2101
2102         for (; left && vleft--; i++, first=0) {
2103                 if (write) {
2104                         while (left) {
2105                                 char c;
2106                                 if (get_user(c, s))
2107                                         return -EFAULT;
2108                                 if (!isspace(c))
2109                                         break;
2110                                 left--;
2111                                 s++;
2112                         }
2113                         if (!left)
2114                                 break;
2115                         neg = 0;
2116                         len = left;
2117                         if (len > sizeof(buf) - 1)
2118                                 len = sizeof(buf) - 1;
2119                         if (copy_from_user(buf, s, len))
2120                                 return -EFAULT;
2121                         buf[len] = 0;
2122                         p = buf;
2123                         if (*p == '-' && left > 1) {
2124                                 neg = 1;
2125                                 p++;
2126                         }
2127                         if (*p < '0' || *p > '9')
2128                                 break;
2129
2130                         lval = simple_strtoul(p, &p, 0);
2131
2132                         len = p-buf;
2133                         if ((len < left) && *p && !isspace(*p))
2134                                 break;
2135                         s += len;
2136                         left -= len;
2137
2138                         if (conv(&neg, &lval, i, 1, data))
2139                                 break;
2140                 } else {
2141                         p = buf;
2142                         if (!first)
2143                                 *p++ = '\t';
2144         
2145                         if (conv(&neg, &lval, i, 0, data))
2146                                 break;
2147
2148                         sprintf(p, "%s%lu", neg ? "-" : "", lval);
2149                         len = strlen(buf);
2150                         if (len > left)
2151                                 len = left;
2152                         if(copy_to_user(s, buf, len))
2153                                 return -EFAULT;
2154                         left -= len;
2155                         s += len;
2156                 }
2157         }
2158
2159         if (!write && !first && left) {
2160                 if(put_user('\n', s))
2161                         return -EFAULT;
2162                 left--, s++;
2163         }
2164         if (write) {
2165                 while (left) {
2166                         char c;
2167                         if (get_user(c, s++))
2168                                 return -EFAULT;
2169                         if (!isspace(c))
2170                                 break;
2171                         left--;
2172                 }
2173         }
2174         if (write && first)
2175                 return -EINVAL;
2176         *lenp -= left;
2177         *ppos += *lenp;
2178         return 0;
2179 #undef TMPBUFLEN
2180 }
2181
2182 static int do_proc_dointvec(struct ctl_table *table, int write,
2183                   void __user *buffer, size_t *lenp, loff_t *ppos,
2184                   int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2185                               int write, void *data),
2186                   void *data)
2187 {
2188         return __do_proc_dointvec(table->data, table, write,
2189                         buffer, lenp, ppos, conv, data);
2190 }
2191
2192 /**
2193  * proc_dointvec - read a vector of integers
2194  * @table: the sysctl table
2195  * @write: %TRUE if this is a write to the sysctl file
2196  * @buffer: the user buffer
2197  * @lenp: the size of the user buffer
2198  * @ppos: file position
2199  *
2200  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2201  * values from/to the user buffer, treated as an ASCII string. 
2202  *
2203  * Returns 0 on success.
2204  */
2205 int proc_dointvec(struct ctl_table *table, int write,
2206                      void __user *buffer, size_t *lenp, loff_t *ppos)
2207 {
2208     return do_proc_dointvec(table,write,buffer,lenp,ppos,
2209                             NULL,NULL);
2210 }
2211
2212 /*
2213  * Taint values can only be increased
2214  * This means we can safely use a temporary.
2215  */
2216 static int proc_taint(struct ctl_table *table, int write,
2217                                void __user *buffer, size_t *lenp, loff_t *ppos)
2218 {
2219         struct ctl_table t;
2220         unsigned long tmptaint = get_taint();
2221         int err;
2222
2223         if (write && !capable(CAP_SYS_ADMIN))
2224                 return -EPERM;
2225
2226         t = *table;
2227         t.data = &tmptaint;
2228         err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2229         if (err < 0)
2230                 return err;
2231
2232         if (write) {
2233                 /*
2234                  * Poor man's atomic or. Not worth adding a primitive
2235                  * to everyone's atomic.h for this
2236                  */
2237                 int i;
2238                 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2239                         if ((tmptaint >> i) & 1)
2240                                 add_taint(i);
2241                 }
2242         }
2243
2244         return err;
2245 }
2246
2247 struct do_proc_dointvec_minmax_conv_param {
2248         int *min;
2249         int *max;
2250 };
2251
2252 static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp, 
2253                                         int *valp, 
2254                                         int write, void *data)
2255 {
2256         struct do_proc_dointvec_minmax_conv_param *param = data;
2257         if (write) {
2258                 int val = *negp ? -*lvalp : *lvalp;
2259                 if ((param->min && *param->min > val) ||
2260                     (param->max && *param->max < val))
2261                         return -EINVAL;
2262                 *valp = val;
2263         } else {
2264                 int val = *valp;
2265                 if (val < 0) {
2266                         *negp = -1;
2267                         *lvalp = (unsigned long)-val;
2268                 } else {
2269                         *negp = 0;
2270                         *lvalp = (unsigned long)val;
2271                 }
2272         }
2273         return 0;
2274 }
2275
2276 /**
2277  * proc_dointvec_minmax - read a vector of integers with min/max values
2278  * @table: the sysctl table
2279  * @write: %TRUE if this is a write to the sysctl file
2280  * @buffer: the user buffer
2281  * @lenp: the size of the user buffer
2282  * @ppos: file position
2283  *
2284  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2285  * values from/to the user buffer, treated as an ASCII string.
2286  *
2287  * This routine will ensure the values are within the range specified by
2288  * table->extra1 (min) and table->extra2 (max).
2289  *
2290  * Returns 0 on success.
2291  */
2292 int proc_dointvec_minmax(struct ctl_table *table, int write,
2293                   void __user *buffer, size_t *lenp, loff_t *ppos)
2294 {
2295         struct do_proc_dointvec_minmax_conv_param param = {
2296                 .min = (int *) table->extra1,
2297                 .max = (int *) table->extra2,
2298         };
2299         return do_proc_dointvec(table, write, buffer, lenp, ppos,
2300                                 do_proc_dointvec_minmax_conv, &param);
2301 }
2302
2303 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2304                                      void __user *buffer,
2305                                      size_t *lenp, loff_t *ppos,
2306                                      unsigned long convmul,
2307                                      unsigned long convdiv)
2308 {
2309 #define TMPBUFLEN 21
2310         unsigned long *i, *min, *max, val;
2311         int vleft, first=1, neg;
2312         size_t len, left;
2313         char buf[TMPBUFLEN], *p;
2314         char __user *s = buffer;
2315         
2316         if (!data || !table->maxlen || !*lenp ||
2317             (*ppos && !write)) {
2318                 *lenp = 0;
2319                 return 0;
2320         }
2321         
2322         i = (unsigned long *) data;
2323         min = (unsigned long *) table->extra1;
2324         max = (unsigned long *) table->extra2;
2325         vleft = table->maxlen / sizeof(unsigned long);
2326         left = *lenp;
2327         
2328         for (; left && vleft--; i++, min++, max++, first=0) {
2329                 if (write) {
2330                         while (left) {
2331                                 char c;
2332                                 if (get_user(c, s))
2333                                         return -EFAULT;
2334                                 if (!isspace(c))
2335                                         break;
2336                                 left--;
2337                                 s++;
2338                         }
2339                         if (!left)
2340                                 break;
2341                         neg = 0;
2342                         len = left;
2343                         if (len > TMPBUFLEN-1)
2344                                 len = TMPBUFLEN-1;
2345                         if (copy_from_user(buf, s, len))
2346                                 return -EFAULT;
2347                         buf[len] = 0;
2348                         p = buf;
2349                         if (*p == '-' && left > 1) {
2350                                 neg = 1;
2351                                 p++;
2352                         }
2353                         if (*p < '0' || *p > '9')
2354                                 break;
2355                         val = simple_strtoul(p, &p, 0) * convmul / convdiv ;
2356                         len = p-buf;
2357                         if ((len < left) && *p && !isspace(*p))
2358                                 break;
2359                         if (neg)
2360                                 val = -val;
2361                         s += len;
2362                         left -= len;
2363
2364                         if(neg)
2365                                 continue;
2366                         if ((min && val < *min) || (max && val > *max))
2367                                 continue;
2368                         *i = val;
2369                 } else {
2370                         p = buf;
2371                         if (!first)
2372                                 *p++ = '\t';
2373                         sprintf(p, "%lu", convdiv * (*i) / convmul);
2374                         len = strlen(buf);
2375                         if (len > left)
2376                                 len = left;
2377                         if(copy_to_user(s, buf, len))
2378                                 return -EFAULT;
2379                         left -= len;
2380                         s += len;
2381                 }
2382         }
2383
2384         if (!write && !first && left) {
2385                 if(put_user('\n', s))
2386                         return -EFAULT;
2387                 left--, s++;
2388         }
2389         if (write) {
2390                 while (left) {
2391                         char c;
2392                         if (get_user(c, s++))
2393                                 return -EFAULT;
2394                         if (!isspace(c))
2395                                 break;
2396                         left--;
2397                 }
2398         }
2399         if (write && first)
2400                 return -EINVAL;
2401         *lenp -= left;
2402         *ppos += *lenp;
2403         return 0;
2404 #undef TMPBUFLEN
2405 }
2406
2407 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2408                                      void __user *buffer,
2409                                      size_t *lenp, loff_t *ppos,
2410                                      unsigned long convmul,
2411                                      unsigned long convdiv)
2412 {
2413         return __do_proc_doulongvec_minmax(table->data, table, write,
2414                         buffer, lenp, ppos, convmul, convdiv);
2415 }
2416
2417 /**
2418  * proc_doulongvec_minmax - read a vector of long integers with min/max values
2419  * @table: the sysctl table
2420  * @write: %TRUE if this is a write to the sysctl file
2421  * @buffer: the user buffer
2422  * @lenp: the size of the user buffer
2423  * @ppos: file position
2424  *
2425  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2426  * values from/to the user buffer, treated as an ASCII string.
2427  *
2428  * This routine will ensure the values are within the range specified by
2429  * table->extra1 (min) and table->extra2 (max).
2430  *
2431  * Returns 0 on success.
2432  */
2433 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2434                            void __user *buffer, size_t *lenp, loff_t *ppos)
2435 {
2436     return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2437 }
2438
2439 /**
2440  * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2441  * @table: the sysctl table
2442  * @write: %TRUE if this is a write to the sysctl file
2443  * @buffer: the user buffer
2444  * @lenp: the size of the user buffer
2445  * @ppos: file position
2446  *
2447  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2448  * values from/to the user buffer, treated as an ASCII string. The values
2449  * are treated as milliseconds, and converted to jiffies when they are stored.
2450  *
2451  * This routine will ensure the values are within the range specified by
2452  * table->extra1 (min) and table->extra2 (max).
2453  *
2454  * Returns 0 on success.
2455  */
2456 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2457                                       void __user *buffer,
2458                                       size_t *lenp, loff_t *ppos)
2459 {
2460     return do_proc_doulongvec_minmax(table, write, buffer,
2461                                      lenp, ppos, HZ, 1000l);
2462 }
2463
2464
2465 static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp,
2466                                          int *valp,
2467                                          int write, void *data)
2468 {
2469         if (write) {
2470                 if (*lvalp > LONG_MAX / HZ)
2471                         return 1;
2472                 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2473         } else {
2474                 int val = *valp;
2475                 unsigned long lval;
2476                 if (val < 0) {
2477                         *negp = -1;
2478                         lval = (unsigned long)-val;
2479                 } else {
2480                         *negp = 0;
2481                         lval = (unsigned long)val;
2482                 }
2483                 *lvalp = lval / HZ;
2484         }
2485         return 0;
2486 }
2487
2488 static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp,
2489                                                 int *valp,
2490                                                 int write, void *data)
2491 {
2492         if (write) {
2493                 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2494                         return 1;
2495                 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2496         } else {
2497                 int val = *valp;
2498                 unsigned long lval;
2499                 if (val < 0) {
2500                         *negp = -1;
2501                         lval = (unsigned long)-val;
2502                 } else {
2503                         *negp = 0;
2504                         lval = (unsigned long)val;
2505                 }
2506                 *lvalp = jiffies_to_clock_t(lval);
2507         }
2508         return 0;
2509 }
2510
2511 static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp,
2512                                             int *valp,
2513                                             int write, void *data)
2514 {
2515         if (write) {
2516                 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2517         } else {
2518                 int val = *valp;
2519                 unsigned long lval;
2520                 if (val < 0) {
2521                         *negp = -1;
2522                         lval = (unsigned long)-val;
2523                 } else {
2524                         *negp = 0;
2525                         lval = (unsigned long)val;
2526                 }
2527                 *lvalp = jiffies_to_msecs(lval);
2528         }
2529         return 0;
2530 }
2531
2532 /**
2533  * proc_dointvec_jiffies - read a vector of integers as seconds
2534  * @table: the sysctl table
2535  * @write: %TRUE if this is a write to the sysctl file
2536  * @buffer: the user buffer
2537  * @lenp: the size of the user buffer
2538  * @ppos: file position
2539  *
2540  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2541  * values from/to the user buffer, treated as an ASCII string. 
2542  * The values read are assumed to be in seconds, and are converted into
2543  * jiffies.
2544  *
2545  * Returns 0 on success.
2546  */
2547 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2548                           void __user *buffer, size_t *lenp, loff_t *ppos)
2549 {
2550     return do_proc_dointvec(table,write,buffer,lenp,ppos,
2551                             do_proc_dointvec_jiffies_conv,NULL);
2552 }
2553
2554 /**
2555  * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2556  * @table: the sysctl table
2557  * @write: %TRUE if this is a write to the sysctl file
2558  * @buffer: the user buffer
2559  * @lenp: the size of the user buffer
2560  * @ppos: pointer to the file position
2561  *
2562  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2563  * values from/to the user buffer, treated as an ASCII string. 
2564  * The values read are assumed to be in 1/USER_HZ seconds, and 
2565  * are converted into jiffies.
2566  *
2567  * Returns 0 on success.
2568  */
2569 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2570                                  void __user *buffer, size_t *lenp, loff_t *ppos)
2571 {
2572     return do_proc_dointvec(table,write,buffer,lenp,ppos,
2573                             do_proc_dointvec_userhz_jiffies_conv,NULL);
2574 }
2575
2576 /**
2577  * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2578  * @table: the sysctl table
2579  * @write: %TRUE if this is a write to the sysctl file
2580  * @buffer: the user buffer
2581  * @lenp: the size of the user buffer
2582  * @ppos: file position
2583  * @ppos: the current position in the file
2584  *
2585  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2586  * values from/to the user buffer, treated as an ASCII string. 
2587  * The values read are assumed to be in 1/1000 seconds, and 
2588  * are converted into jiffies.
2589  *
2590  * Returns 0 on success.
2591  */
2592 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2593                              void __user *buffer, size_t *lenp, loff_t *ppos)
2594 {
2595         return do_proc_dointvec(table, write, buffer, lenp, ppos,
2596                                 do_proc_dointvec_ms_jiffies_conv, NULL);
2597 }
2598
2599 static int proc_do_cad_pid(struct ctl_table *table, int write,
2600                            void __user *buffer, size_t *lenp, loff_t *ppos)
2601 {
2602         struct pid *new_pid;
2603         pid_t tmp;
2604         int r;
2605
2606         tmp = pid_vnr(cad_pid);
2607
2608         r = __do_proc_dointvec(&tmp, table, write, buffer,
2609                                lenp, ppos, NULL, NULL);
2610         if (r || !write)
2611                 return r;
2612
2613         new_pid = find_get_pid(tmp);
2614         if (!new_pid)
2615                 return -ESRCH;
2616
2617         put_pid(xchg(&cad_pid, new_pid));
2618         return 0;
2619 }
2620
2621 #else /* CONFIG_PROC_FS */
2622
2623 int proc_dostring(struct ctl_table *table, int write,
2624                   void __user *buffer, size_t *lenp, loff_t *ppos)
2625 {
2626         return -ENOSYS;
2627 }
2628
2629 int proc_dointvec(struct ctl_table *table, int write,
2630                   void __user *buffer, size_t *lenp, loff_t *ppos)
2631 {
2632         return -ENOSYS;
2633 }
2634
2635 int proc_dointvec_minmax(struct ctl_table *table, int write,
2636                     void __user *buffer, size_t *lenp, loff_t *ppos)
2637 {
2638         return -ENOSYS;
2639 }
2640
2641 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2642                     void __user *buffer, size_t *lenp, loff_t *ppos)
2643 {
2644         return -ENOSYS;
2645 }
2646
2647 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2648                     void __user *buffer, size_t *lenp, loff_t *ppos)
2649 {
2650         return -ENOSYS;
2651 }
2652
2653 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2654                              void __user *buffer, size_t *lenp, loff_t *ppos)
2655 {
2656         return -ENOSYS;
2657 }
2658
2659 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2660                     void __user *buffer, size_t *lenp, loff_t *ppos)
2661 {
2662         return -ENOSYS;
2663 }
2664
2665 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2666                                       void __user *buffer,
2667                                       size_t *lenp, loff_t *ppos)
2668 {
2669     return -ENOSYS;
2670 }
2671
2672
2673 #endif /* CONFIG_PROC_FS */
2674
2675 /*
2676  * No sense putting this after each symbol definition, twice,
2677  * exception granted :-)
2678  */
2679 EXPORT_SYMBOL(proc_dointvec);
2680 EXPORT_SYMBOL(proc_dointvec_jiffies);
2681 EXPORT_SYMBOL(proc_dointvec_minmax);
2682 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2683 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2684 EXPORT_SYMBOL(proc_dostring);
2685 EXPORT_SYMBOL(proc_doulongvec_minmax);
2686 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
2687 EXPORT_SYMBOL(register_sysctl_table);
2688 EXPORT_SYMBOL(register_sysctl_paths);
2689 EXPORT_SYMBOL(unregister_sysctl_table);