lockup_detector: Combine nmi_watchdog and softlockup detector
[linux-2.6.git] / kernel / sysctl.c
1 /*
2  * sysctl.c: General linux system control interface
3  *
4  * Begun 24 March 1995, Stephen Tweedie
5  * Added /proc support, Dec 1995
6  * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
7  * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
8  * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
9  * Dynamic registration fixes, Stephen Tweedie.
10  * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
11  * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
12  *  Horn.
13  * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
14  * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
15  * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
16  *  Wendling.
17  * The list_for_each() macro wasn't appropriate for the sysctl loop.
18  *  Removed it and replaced it with older style, 03/23/00, Bill Wendling
19  */
20
21 #include <linux/module.h>
22 #include <linux/mm.h>
23 #include <linux/swap.h>
24 #include <linux/slab.h>
25 #include <linux/sysctl.h>
26 #include <linux/signal.h>
27 #include <linux/proc_fs.h>
28 #include <linux/security.h>
29 #include <linux/ctype.h>
30 #include <linux/kmemcheck.h>
31 #include <linux/fs.h>
32 #include <linux/init.h>
33 #include <linux/kernel.h>
34 #include <linux/kobject.h>
35 #include <linux/net.h>
36 #include <linux/sysrq.h>
37 #include <linux/highuid.h>
38 #include <linux/writeback.h>
39 #include <linux/ratelimit.h>
40 #include <linux/hugetlb.h>
41 #include <linux/initrd.h>
42 #include <linux/key.h>
43 #include <linux/times.h>
44 #include <linux/limits.h>
45 #include <linux/dcache.h>
46 #include <linux/syscalls.h>
47 #include <linux/vmstat.h>
48 #include <linux/nfs_fs.h>
49 #include <linux/acpi.h>
50 #include <linux/reboot.h>
51 #include <linux/ftrace.h>
52 #include <linux/slow-work.h>
53 #include <linux/perf_event.h>
54 #include <linux/kprobes.h>
55
56 #include <asm/uaccess.h>
57 #include <asm/processor.h>
58
59 #ifdef CONFIG_X86
60 #include <asm/nmi.h>
61 #include <asm/stacktrace.h>
62 #include <asm/io.h>
63 #endif
64 #ifdef CONFIG_BSD_PROCESS_ACCT
65 #include <linux/acct.h>
66 #endif
67 #ifdef CONFIG_RT_MUTEXES
68 #include <linux/rtmutex.h>
69 #endif
70 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
71 #include <linux/lockdep.h>
72 #endif
73 #ifdef CONFIG_CHR_DEV_SG
74 #include <scsi/sg.h>
75 #endif
76
77 #ifdef CONFIG_LOCKUP_DETECTOR
78 #include <linux/nmi.h>
79 #endif
80
81
82 #if defined(CONFIG_SYSCTL)
83
84 /* External variables not in a header file. */
85 extern int sysctl_overcommit_memory;
86 extern int sysctl_overcommit_ratio;
87 extern int sysctl_panic_on_oom;
88 extern int sysctl_oom_kill_allocating_task;
89 extern int sysctl_oom_dump_tasks;
90 extern int max_threads;
91 extern int core_uses_pid;
92 extern int suid_dumpable;
93 extern char core_pattern[];
94 extern unsigned int core_pipe_limit;
95 extern int pid_max;
96 extern int min_free_kbytes;
97 extern int pid_max_min, pid_max_max;
98 extern int sysctl_drop_caches;
99 extern int percpu_pagelist_fraction;
100 extern int compat_log;
101 extern int latencytop_enabled;
102 extern int sysctl_nr_open_min, sysctl_nr_open_max;
103 #ifndef CONFIG_MMU
104 extern int sysctl_nr_trim_pages;
105 #endif
106 #ifdef CONFIG_BLOCK
107 extern int blk_iopoll_enabled;
108 #endif
109
110 /* Constants used for minimum and  maximum */
111 #ifdef CONFIG_DETECT_SOFTLOCKUP
112 static int sixty = 60;
113 static int neg_one = -1;
114 #endif
115
116 static int zero;
117 static int __maybe_unused one = 1;
118 static int __maybe_unused two = 2;
119 static unsigned long one_ul = 1;
120 static int one_hundred = 100;
121 #ifdef CONFIG_PRINTK
122 static int ten_thousand = 10000;
123 #endif
124
125 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
126 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
127
128 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
129 static int maxolduid = 65535;
130 static int minolduid;
131 static int min_percpu_pagelist_fract = 8;
132
133 static int ngroups_max = NGROUPS_MAX;
134
135 #ifdef CONFIG_SPARC
136 #include <asm/system.h>
137 #endif
138
139 #ifdef CONFIG_SPARC64
140 extern int sysctl_tsb_ratio;
141 #endif
142
143 #ifdef __hppa__
144 extern int pwrsw_enabled;
145 extern int unaligned_enabled;
146 #endif
147
148 #ifdef CONFIG_S390
149 #ifdef CONFIG_MATHEMU
150 extern int sysctl_ieee_emulation_warnings;
151 #endif
152 extern int sysctl_userprocess_debug;
153 extern int spin_retry;
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_PROC_SYSCTL
164 static int proc_do_cad_pid(struct ctl_table *table, int write,
165                   void __user *buffer, size_t *lenp, loff_t *ppos);
166 static int proc_taint(struct ctl_table *table, int write,
167                                void __user *buffer, size_t *lenp, loff_t *ppos);
168 #endif
169
170 static struct ctl_table root_table[];
171 static struct ctl_table_root sysctl_table_root;
172 static struct ctl_table_header root_table_header = {
173         .count = 1,
174         .ctl_table = root_table,
175         .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.default_set.list),
176         .root = &sysctl_table_root,
177         .set = &sysctl_table_root.default_set,
178 };
179 static struct ctl_table_root sysctl_table_root = {
180         .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list),
181         .default_set.list = LIST_HEAD_INIT(root_table_header.ctl_entry),
182 };
183
184 static struct ctl_table kern_table[];
185 static struct ctl_table vm_table[];
186 static struct ctl_table fs_table[];
187 static struct ctl_table debug_table[];
188 static struct ctl_table dev_table[];
189 extern struct ctl_table random_table[];
190 #ifdef CONFIG_INOTIFY_USER
191 extern struct ctl_table inotify_table[];
192 #endif
193 #ifdef CONFIG_EPOLL
194 extern struct ctl_table epoll_table[];
195 #endif
196
197 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
198 int sysctl_legacy_va_layout;
199 #endif
200
201 /* The default sysctl tables: */
202
203 static struct ctl_table root_table[] = {
204         {
205                 .procname       = "kernel",
206                 .mode           = 0555,
207                 .child          = kern_table,
208         },
209         {
210                 .procname       = "vm",
211                 .mode           = 0555,
212                 .child          = vm_table,
213         },
214         {
215                 .procname       = "fs",
216                 .mode           = 0555,
217                 .child          = fs_table,
218         },
219         {
220                 .procname       = "debug",
221                 .mode           = 0555,
222                 .child          = debug_table,
223         },
224         {
225                 .procname       = "dev",
226                 .mode           = 0555,
227                 .child          = dev_table,
228         },
229 /*
230  * NOTE: do not add new entries to this table unless you have read
231  * Documentation/sysctl/ctl_unnumbered.txt
232  */
233         { }
234 };
235
236 #ifdef CONFIG_SCHED_DEBUG
237 static int min_sched_granularity_ns = 100000;           /* 100 usecs */
238 static int max_sched_granularity_ns = NSEC_PER_SEC;     /* 1 second */
239 static int min_wakeup_granularity_ns;                   /* 0 usecs */
240 static int max_wakeup_granularity_ns = NSEC_PER_SEC;    /* 1 second */
241 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
242 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
243 static int min_sched_shares_ratelimit = 100000; /* 100 usec */
244 static int max_sched_shares_ratelimit = NSEC_PER_SEC; /* 1 second */
245 #endif
246
247 static struct ctl_table kern_table[] = {
248         {
249                 .procname       = "sched_child_runs_first",
250                 .data           = &sysctl_sched_child_runs_first,
251                 .maxlen         = sizeof(unsigned int),
252                 .mode           = 0644,
253                 .proc_handler   = proc_dointvec,
254         },
255 #ifdef CONFIG_SCHED_DEBUG
256         {
257                 .procname       = "sched_min_granularity_ns",
258                 .data           = &sysctl_sched_min_granularity,
259                 .maxlen         = sizeof(unsigned int),
260                 .mode           = 0644,
261                 .proc_handler   = sched_proc_update_handler,
262                 .extra1         = &min_sched_granularity_ns,
263                 .extra2         = &max_sched_granularity_ns,
264         },
265         {
266                 .procname       = "sched_latency_ns",
267                 .data           = &sysctl_sched_latency,
268                 .maxlen         = sizeof(unsigned int),
269                 .mode           = 0644,
270                 .proc_handler   = sched_proc_update_handler,
271                 .extra1         = &min_sched_granularity_ns,
272                 .extra2         = &max_sched_granularity_ns,
273         },
274         {
275                 .procname       = "sched_wakeup_granularity_ns",
276                 .data           = &sysctl_sched_wakeup_granularity,
277                 .maxlen         = sizeof(unsigned int),
278                 .mode           = 0644,
279                 .proc_handler   = sched_proc_update_handler,
280                 .extra1         = &min_wakeup_granularity_ns,
281                 .extra2         = &max_wakeup_granularity_ns,
282         },
283         {
284                 .procname       = "sched_shares_ratelimit",
285                 .data           = &sysctl_sched_shares_ratelimit,
286                 .maxlen         = sizeof(unsigned int),
287                 .mode           = 0644,
288                 .proc_handler   = sched_proc_update_handler,
289                 .extra1         = &min_sched_shares_ratelimit,
290                 .extra2         = &max_sched_shares_ratelimit,
291         },
292         {
293                 .procname       = "sched_tunable_scaling",
294                 .data           = &sysctl_sched_tunable_scaling,
295                 .maxlen         = sizeof(enum sched_tunable_scaling),
296                 .mode           = 0644,
297                 .proc_handler   = sched_proc_update_handler,
298                 .extra1         = &min_sched_tunable_scaling,
299                 .extra2         = &max_sched_tunable_scaling,
300         },
301         {
302                 .procname       = "sched_shares_thresh",
303                 .data           = &sysctl_sched_shares_thresh,
304                 .maxlen         = sizeof(unsigned int),
305                 .mode           = 0644,
306                 .proc_handler   = proc_dointvec_minmax,
307                 .extra1         = &zero,
308         },
309         {
310                 .procname       = "sched_migration_cost",
311                 .data           = &sysctl_sched_migration_cost,
312                 .maxlen         = sizeof(unsigned int),
313                 .mode           = 0644,
314                 .proc_handler   = proc_dointvec,
315         },
316         {
317                 .procname       = "sched_nr_migrate",
318                 .data           = &sysctl_sched_nr_migrate,
319                 .maxlen         = sizeof(unsigned int),
320                 .mode           = 0644,
321                 .proc_handler   = proc_dointvec,
322         },
323         {
324                 .procname       = "sched_time_avg",
325                 .data           = &sysctl_sched_time_avg,
326                 .maxlen         = sizeof(unsigned int),
327                 .mode           = 0644,
328                 .proc_handler   = proc_dointvec,
329         },
330         {
331                 .procname       = "timer_migration",
332                 .data           = &sysctl_timer_migration,
333                 .maxlen         = sizeof(unsigned int),
334                 .mode           = 0644,
335                 .proc_handler   = proc_dointvec_minmax,
336                 .extra1         = &zero,
337                 .extra2         = &one,
338         },
339 #endif
340         {
341                 .procname       = "sched_rt_period_us",
342                 .data           = &sysctl_sched_rt_period,
343                 .maxlen         = sizeof(unsigned int),
344                 .mode           = 0644,
345                 .proc_handler   = sched_rt_handler,
346         },
347         {
348                 .procname       = "sched_rt_runtime_us",
349                 .data           = &sysctl_sched_rt_runtime,
350                 .maxlen         = sizeof(int),
351                 .mode           = 0644,
352                 .proc_handler   = sched_rt_handler,
353         },
354         {
355                 .procname       = "sched_compat_yield",
356                 .data           = &sysctl_sched_compat_yield,
357                 .maxlen         = sizeof(unsigned int),
358                 .mode           = 0644,
359                 .proc_handler   = proc_dointvec,
360         },
361 #ifdef CONFIG_PROVE_LOCKING
362         {
363                 .procname       = "prove_locking",
364                 .data           = &prove_locking,
365                 .maxlen         = sizeof(int),
366                 .mode           = 0644,
367                 .proc_handler   = proc_dointvec,
368         },
369 #endif
370 #ifdef CONFIG_LOCK_STAT
371         {
372                 .procname       = "lock_stat",
373                 .data           = &lock_stat,
374                 .maxlen         = sizeof(int),
375                 .mode           = 0644,
376                 .proc_handler   = proc_dointvec,
377         },
378 #endif
379         {
380                 .procname       = "panic",
381                 .data           = &panic_timeout,
382                 .maxlen         = sizeof(int),
383                 .mode           = 0644,
384                 .proc_handler   = proc_dointvec,
385         },
386         {
387                 .procname       = "core_uses_pid",
388                 .data           = &core_uses_pid,
389                 .maxlen         = sizeof(int),
390                 .mode           = 0644,
391                 .proc_handler   = proc_dointvec,
392         },
393         {
394                 .procname       = "core_pattern",
395                 .data           = core_pattern,
396                 .maxlen         = CORENAME_MAX_SIZE,
397                 .mode           = 0644,
398                 .proc_handler   = proc_dostring,
399         },
400         {
401                 .procname       = "core_pipe_limit",
402                 .data           = &core_pipe_limit,
403                 .maxlen         = sizeof(unsigned int),
404                 .mode           = 0644,
405                 .proc_handler   = proc_dointvec,
406         },
407 #ifdef CONFIG_PROC_SYSCTL
408         {
409                 .procname       = "tainted",
410                 .maxlen         = sizeof(long),
411                 .mode           = 0644,
412                 .proc_handler   = proc_taint,
413         },
414 #endif
415 #ifdef CONFIG_LATENCYTOP
416         {
417                 .procname       = "latencytop",
418                 .data           = &latencytop_enabled,
419                 .maxlen         = sizeof(int),
420                 .mode           = 0644,
421                 .proc_handler   = proc_dointvec,
422         },
423 #endif
424 #ifdef CONFIG_BLK_DEV_INITRD
425         {
426                 .procname       = "real-root-dev",
427                 .data           = &real_root_dev,
428                 .maxlen         = sizeof(int),
429                 .mode           = 0644,
430                 .proc_handler   = proc_dointvec,
431         },
432 #endif
433         {
434                 .procname       = "print-fatal-signals",
435                 .data           = &print_fatal_signals,
436                 .maxlen         = sizeof(int),
437                 .mode           = 0644,
438                 .proc_handler   = proc_dointvec,
439         },
440 #ifdef CONFIG_SPARC
441         {
442                 .procname       = "reboot-cmd",
443                 .data           = reboot_command,
444                 .maxlen         = 256,
445                 .mode           = 0644,
446                 .proc_handler   = proc_dostring,
447         },
448         {
449                 .procname       = "stop-a",
450                 .data           = &stop_a_enabled,
451                 .maxlen         = sizeof (int),
452                 .mode           = 0644,
453                 .proc_handler   = proc_dointvec,
454         },
455         {
456                 .procname       = "scons-poweroff",
457                 .data           = &scons_pwroff,
458                 .maxlen         = sizeof (int),
459                 .mode           = 0644,
460                 .proc_handler   = proc_dointvec,
461         },
462 #endif
463 #ifdef CONFIG_SPARC64
464         {
465                 .procname       = "tsb-ratio",
466                 .data           = &sysctl_tsb_ratio,
467                 .maxlen         = sizeof (int),
468                 .mode           = 0644,
469                 .proc_handler   = proc_dointvec,
470         },
471 #endif
472 #ifdef __hppa__
473         {
474                 .procname       = "soft-power",
475                 .data           = &pwrsw_enabled,
476                 .maxlen         = sizeof (int),
477                 .mode           = 0644,
478                 .proc_handler   = proc_dointvec,
479         },
480         {
481                 .procname       = "unaligned-trap",
482                 .data           = &unaligned_enabled,
483                 .maxlen         = sizeof (int),
484                 .mode           = 0644,
485                 .proc_handler   = proc_dointvec,
486         },
487 #endif
488         {
489                 .procname       = "ctrl-alt-del",
490                 .data           = &C_A_D,
491                 .maxlen         = sizeof(int),
492                 .mode           = 0644,
493                 .proc_handler   = proc_dointvec,
494         },
495 #ifdef CONFIG_FUNCTION_TRACER
496         {
497                 .procname       = "ftrace_enabled",
498                 .data           = &ftrace_enabled,
499                 .maxlen         = sizeof(int),
500                 .mode           = 0644,
501                 .proc_handler   = ftrace_enable_sysctl,
502         },
503 #endif
504 #ifdef CONFIG_STACK_TRACER
505         {
506                 .procname       = "stack_tracer_enabled",
507                 .data           = &stack_tracer_enabled,
508                 .maxlen         = sizeof(int),
509                 .mode           = 0644,
510                 .proc_handler   = stack_trace_sysctl,
511         },
512 #endif
513 #ifdef CONFIG_TRACING
514         {
515                 .procname       = "ftrace_dump_on_oops",
516                 .data           = &ftrace_dump_on_oops,
517                 .maxlen         = sizeof(int),
518                 .mode           = 0644,
519                 .proc_handler   = proc_dointvec,
520         },
521 #endif
522 #ifdef CONFIG_MODULES
523         {
524                 .procname       = "modprobe",
525                 .data           = &modprobe_path,
526                 .maxlen         = KMOD_PATH_LEN,
527                 .mode           = 0644,
528                 .proc_handler   = proc_dostring,
529         },
530         {
531                 .procname       = "modules_disabled",
532                 .data           = &modules_disabled,
533                 .maxlen         = sizeof(int),
534                 .mode           = 0644,
535                 /* only handle a transition from default "0" to "1" */
536                 .proc_handler   = proc_dointvec_minmax,
537                 .extra1         = &one,
538                 .extra2         = &one,
539         },
540 #endif
541 #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
542         {
543                 .procname       = "hotplug",
544                 .data           = &uevent_helper,
545                 .maxlen         = UEVENT_HELPER_PATH_LEN,
546                 .mode           = 0644,
547                 .proc_handler   = proc_dostring,
548         },
549 #endif
550 #ifdef CONFIG_CHR_DEV_SG
551         {
552                 .procname       = "sg-big-buff",
553                 .data           = &sg_big_buff,
554                 .maxlen         = sizeof (int),
555                 .mode           = 0444,
556                 .proc_handler   = proc_dointvec,
557         },
558 #endif
559 #ifdef CONFIG_BSD_PROCESS_ACCT
560         {
561                 .procname       = "acct",
562                 .data           = &acct_parm,
563                 .maxlen         = 3*sizeof(int),
564                 .mode           = 0644,
565                 .proc_handler   = proc_dointvec,
566         },
567 #endif
568 #ifdef CONFIG_MAGIC_SYSRQ
569         {
570                 .procname       = "sysrq",
571                 .data           = &__sysrq_enabled,
572                 .maxlen         = sizeof (int),
573                 .mode           = 0644,
574                 .proc_handler   = proc_dointvec,
575         },
576 #endif
577 #ifdef CONFIG_PROC_SYSCTL
578         {
579                 .procname       = "cad_pid",
580                 .data           = NULL,
581                 .maxlen         = sizeof (int),
582                 .mode           = 0600,
583                 .proc_handler   = proc_do_cad_pid,
584         },
585 #endif
586         {
587                 .procname       = "threads-max",
588                 .data           = &max_threads,
589                 .maxlen         = sizeof(int),
590                 .mode           = 0644,
591                 .proc_handler   = proc_dointvec,
592         },
593         {
594                 .procname       = "random",
595                 .mode           = 0555,
596                 .child          = random_table,
597         },
598         {
599                 .procname       = "overflowuid",
600                 .data           = &overflowuid,
601                 .maxlen         = sizeof(int),
602                 .mode           = 0644,
603                 .proc_handler   = proc_dointvec_minmax,
604                 .extra1         = &minolduid,
605                 .extra2         = &maxolduid,
606         },
607         {
608                 .procname       = "overflowgid",
609                 .data           = &overflowgid,
610                 .maxlen         = sizeof(int),
611                 .mode           = 0644,
612                 .proc_handler   = proc_dointvec_minmax,
613                 .extra1         = &minolduid,
614                 .extra2         = &maxolduid,
615         },
616 #ifdef CONFIG_S390
617 #ifdef CONFIG_MATHEMU
618         {
619                 .procname       = "ieee_emulation_warnings",
620                 .data           = &sysctl_ieee_emulation_warnings,
621                 .maxlen         = sizeof(int),
622                 .mode           = 0644,
623                 .proc_handler   = proc_dointvec,
624         },
625 #endif
626         {
627                 .procname       = "userprocess_debug",
628                 .data           = &sysctl_userprocess_debug,
629                 .maxlen         = sizeof(int),
630                 .mode           = 0644,
631                 .proc_handler   = proc_dointvec,
632         },
633 #endif
634         {
635                 .procname       = "pid_max",
636                 .data           = &pid_max,
637                 .maxlen         = sizeof (int),
638                 .mode           = 0644,
639                 .proc_handler   = proc_dointvec_minmax,
640                 .extra1         = &pid_max_min,
641                 .extra2         = &pid_max_max,
642         },
643         {
644                 .procname       = "panic_on_oops",
645                 .data           = &panic_on_oops,
646                 .maxlen         = sizeof(int),
647                 .mode           = 0644,
648                 .proc_handler   = proc_dointvec,
649         },
650 #if defined CONFIG_PRINTK
651         {
652                 .procname       = "printk",
653                 .data           = &console_loglevel,
654                 .maxlen         = 4*sizeof(int),
655                 .mode           = 0644,
656                 .proc_handler   = proc_dointvec,
657         },
658         {
659                 .procname       = "printk_ratelimit",
660                 .data           = &printk_ratelimit_state.interval,
661                 .maxlen         = sizeof(int),
662                 .mode           = 0644,
663                 .proc_handler   = proc_dointvec_jiffies,
664         },
665         {
666                 .procname       = "printk_ratelimit_burst",
667                 .data           = &printk_ratelimit_state.burst,
668                 .maxlen         = sizeof(int),
669                 .mode           = 0644,
670                 .proc_handler   = proc_dointvec,
671         },
672         {
673                 .procname       = "printk_delay",
674                 .data           = &printk_delay_msec,
675                 .maxlen         = sizeof(int),
676                 .mode           = 0644,
677                 .proc_handler   = proc_dointvec_minmax,
678                 .extra1         = &zero,
679                 .extra2         = &ten_thousand,
680         },
681 #endif
682         {
683                 .procname       = "ngroups_max",
684                 .data           = &ngroups_max,
685                 .maxlen         = sizeof (int),
686                 .mode           = 0444,
687                 .proc_handler   = proc_dointvec,
688         },
689 #if defined(CONFIG_LOCKUP_DETECTOR)
690         {
691                 .procname       = "watchdog",
692                 .data           = &watchdog_enabled,
693                 .maxlen         = sizeof (int),
694                 .mode           = 0644,
695                 .proc_handler   = proc_dowatchdog_enabled,
696         },
697         {
698                 .procname       = "watchdog_thresh",
699                 .data           = &softlockup_thresh,
700                 .maxlen         = sizeof(int),
701                 .mode           = 0644,
702                 .proc_handler   = proc_dowatchdog_thresh,
703                 .extra1         = &neg_one,
704                 .extra2         = &sixty,
705         },
706 #endif
707 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86) && !defined(CONFIG_LOCKUP_DETECTOR)
708         {
709                 .procname       = "unknown_nmi_panic",
710                 .data           = &unknown_nmi_panic,
711                 .maxlen         = sizeof (int),
712                 .mode           = 0644,
713                 .proc_handler   = proc_dointvec,
714         },
715         {
716                 .procname       = "nmi_watchdog",
717                 .data           = &nmi_watchdog_enabled,
718                 .maxlen         = sizeof (int),
719                 .mode           = 0644,
720                 .proc_handler   = proc_nmi_enabled,
721         },
722 #endif
723 #if defined(CONFIG_X86)
724         {
725                 .procname       = "panic_on_unrecovered_nmi",
726                 .data           = &panic_on_unrecovered_nmi,
727                 .maxlen         = sizeof(int),
728                 .mode           = 0644,
729                 .proc_handler   = proc_dointvec,
730         },
731         {
732                 .procname       = "panic_on_io_nmi",
733                 .data           = &panic_on_io_nmi,
734                 .maxlen         = sizeof(int),
735                 .mode           = 0644,
736                 .proc_handler   = proc_dointvec,
737         },
738         {
739                 .procname       = "bootloader_type",
740                 .data           = &bootloader_type,
741                 .maxlen         = sizeof (int),
742                 .mode           = 0444,
743                 .proc_handler   = proc_dointvec,
744         },
745         {
746                 .procname       = "bootloader_version",
747                 .data           = &bootloader_version,
748                 .maxlen         = sizeof (int),
749                 .mode           = 0444,
750                 .proc_handler   = proc_dointvec,
751         },
752         {
753                 .procname       = "kstack_depth_to_print",
754                 .data           = &kstack_depth_to_print,
755                 .maxlen         = sizeof(int),
756                 .mode           = 0644,
757                 .proc_handler   = proc_dointvec,
758         },
759         {
760                 .procname       = "io_delay_type",
761                 .data           = &io_delay_type,
762                 .maxlen         = sizeof(int),
763                 .mode           = 0644,
764                 .proc_handler   = proc_dointvec,
765         },
766 #endif
767 #if defined(CONFIG_MMU)
768         {
769                 .procname       = "randomize_va_space",
770                 .data           = &randomize_va_space,
771                 .maxlen         = sizeof(int),
772                 .mode           = 0644,
773                 .proc_handler   = proc_dointvec,
774         },
775 #endif
776 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
777         {
778                 .procname       = "spin_retry",
779                 .data           = &spin_retry,
780                 .maxlen         = sizeof (int),
781                 .mode           = 0644,
782                 .proc_handler   = proc_dointvec,
783         },
784 #endif
785 #if     defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
786         {
787                 .procname       = "acpi_video_flags",
788                 .data           = &acpi_realmode_flags,
789                 .maxlen         = sizeof (unsigned long),
790                 .mode           = 0644,
791                 .proc_handler   = proc_doulongvec_minmax,
792         },
793 #endif
794 #ifdef CONFIG_IA64
795         {
796                 .procname       = "ignore-unaligned-usertrap",
797                 .data           = &no_unaligned_warning,
798                 .maxlen         = sizeof (int),
799                 .mode           = 0644,
800                 .proc_handler   = proc_dointvec,
801         },
802         {
803                 .procname       = "unaligned-dump-stack",
804                 .data           = &unaligned_dump_stack,
805                 .maxlen         = sizeof (int),
806                 .mode           = 0644,
807                 .proc_handler   = proc_dointvec,
808         },
809 #endif
810 #ifdef CONFIG_DETECT_SOFTLOCKUP
811         {
812                 .procname       = "softlockup_panic",
813                 .data           = &softlockup_panic,
814                 .maxlen         = sizeof(int),
815                 .mode           = 0644,
816                 .proc_handler   = proc_dointvec_minmax,
817                 .extra1         = &zero,
818                 .extra2         = &one,
819         },
820         {
821                 .procname       = "softlockup_thresh",
822                 .data           = &softlockup_thresh,
823                 .maxlen         = sizeof(int),
824                 .mode           = 0644,
825                 .proc_handler   = proc_dosoftlockup_thresh,
826                 .extra1         = &neg_one,
827                 .extra2         = &sixty,
828         },
829 #endif
830 #ifdef CONFIG_DETECT_HUNG_TASK
831         {
832                 .procname       = "hung_task_panic",
833                 .data           = &sysctl_hung_task_panic,
834                 .maxlen         = sizeof(int),
835                 .mode           = 0644,
836                 .proc_handler   = proc_dointvec_minmax,
837                 .extra1         = &zero,
838                 .extra2         = &one,
839         },
840         {
841                 .procname       = "hung_task_check_count",
842                 .data           = &sysctl_hung_task_check_count,
843                 .maxlen         = sizeof(unsigned long),
844                 .mode           = 0644,
845                 .proc_handler   = proc_doulongvec_minmax,
846         },
847         {
848                 .procname       = "hung_task_timeout_secs",
849                 .data           = &sysctl_hung_task_timeout_secs,
850                 .maxlen         = sizeof(unsigned long),
851                 .mode           = 0644,
852                 .proc_handler   = proc_dohung_task_timeout_secs,
853         },
854         {
855                 .procname       = "hung_task_warnings",
856                 .data           = &sysctl_hung_task_warnings,
857                 .maxlen         = sizeof(unsigned long),
858                 .mode           = 0644,
859                 .proc_handler   = proc_doulongvec_minmax,
860         },
861 #endif
862 #ifdef CONFIG_COMPAT
863         {
864                 .procname       = "compat-log",
865                 .data           = &compat_log,
866                 .maxlen         = sizeof (int),
867                 .mode           = 0644,
868                 .proc_handler   = proc_dointvec,
869         },
870 #endif
871 #ifdef CONFIG_RT_MUTEXES
872         {
873                 .procname       = "max_lock_depth",
874                 .data           = &max_lock_depth,
875                 .maxlen         = sizeof(int),
876                 .mode           = 0644,
877                 .proc_handler   = proc_dointvec,
878         },
879 #endif
880         {
881                 .procname       = "poweroff_cmd",
882                 .data           = &poweroff_cmd,
883                 .maxlen         = POWEROFF_CMD_PATH_LEN,
884                 .mode           = 0644,
885                 .proc_handler   = proc_dostring,
886         },
887 #ifdef CONFIG_KEYS
888         {
889                 .procname       = "keys",
890                 .mode           = 0555,
891                 .child          = key_sysctls,
892         },
893 #endif
894 #ifdef CONFIG_RCU_TORTURE_TEST
895         {
896                 .procname       = "rcutorture_runnable",
897                 .data           = &rcutorture_runnable,
898                 .maxlen         = sizeof(int),
899                 .mode           = 0644,
900                 .proc_handler   = proc_dointvec,
901         },
902 #endif
903 #ifdef CONFIG_SLOW_WORK
904         {
905                 .procname       = "slow-work",
906                 .mode           = 0555,
907                 .child          = slow_work_sysctls,
908         },
909 #endif
910 #ifdef CONFIG_PERF_EVENTS
911         {
912                 .procname       = "perf_event_paranoid",
913                 .data           = &sysctl_perf_event_paranoid,
914                 .maxlen         = sizeof(sysctl_perf_event_paranoid),
915                 .mode           = 0644,
916                 .proc_handler   = proc_dointvec,
917         },
918         {
919                 .procname       = "perf_event_mlock_kb",
920                 .data           = &sysctl_perf_event_mlock,
921                 .maxlen         = sizeof(sysctl_perf_event_mlock),
922                 .mode           = 0644,
923                 .proc_handler   = proc_dointvec,
924         },
925         {
926                 .procname       = "perf_event_max_sample_rate",
927                 .data           = &sysctl_perf_event_sample_rate,
928                 .maxlen         = sizeof(sysctl_perf_event_sample_rate),
929                 .mode           = 0644,
930                 .proc_handler   = proc_dointvec,
931         },
932 #endif
933 #ifdef CONFIG_KMEMCHECK
934         {
935                 .procname       = "kmemcheck",
936                 .data           = &kmemcheck_enabled,
937                 .maxlen         = sizeof(int),
938                 .mode           = 0644,
939                 .proc_handler   = proc_dointvec,
940         },
941 #endif
942 #ifdef CONFIG_BLOCK
943         {
944                 .procname       = "blk_iopoll",
945                 .data           = &blk_iopoll_enabled,
946                 .maxlen         = sizeof(int),
947                 .mode           = 0644,
948                 .proc_handler   = proc_dointvec,
949         },
950 #endif
951 /*
952  * NOTE: do not add new entries to this table unless you have read
953  * Documentation/sysctl/ctl_unnumbered.txt
954  */
955         { }
956 };
957
958 static struct ctl_table vm_table[] = {
959         {
960                 .procname       = "overcommit_memory",
961                 .data           = &sysctl_overcommit_memory,
962                 .maxlen         = sizeof(sysctl_overcommit_memory),
963                 .mode           = 0644,
964                 .proc_handler   = proc_dointvec,
965         },
966         {
967                 .procname       = "panic_on_oom",
968                 .data           = &sysctl_panic_on_oom,
969                 .maxlen         = sizeof(sysctl_panic_on_oom),
970                 .mode           = 0644,
971                 .proc_handler   = proc_dointvec,
972         },
973         {
974                 .procname       = "oom_kill_allocating_task",
975                 .data           = &sysctl_oom_kill_allocating_task,
976                 .maxlen         = sizeof(sysctl_oom_kill_allocating_task),
977                 .mode           = 0644,
978                 .proc_handler   = proc_dointvec,
979         },
980         {
981                 .procname       = "oom_dump_tasks",
982                 .data           = &sysctl_oom_dump_tasks,
983                 .maxlen         = sizeof(sysctl_oom_dump_tasks),
984                 .mode           = 0644,
985                 .proc_handler   = proc_dointvec,
986         },
987         {
988                 .procname       = "overcommit_ratio",
989                 .data           = &sysctl_overcommit_ratio,
990                 .maxlen         = sizeof(sysctl_overcommit_ratio),
991                 .mode           = 0644,
992                 .proc_handler   = proc_dointvec,
993         },
994         {
995                 .procname       = "page-cluster", 
996                 .data           = &page_cluster,
997                 .maxlen         = sizeof(int),
998                 .mode           = 0644,
999                 .proc_handler   = proc_dointvec,
1000         },
1001         {
1002                 .procname       = "dirty_background_ratio",
1003                 .data           = &dirty_background_ratio,
1004                 .maxlen         = sizeof(dirty_background_ratio),
1005                 .mode           = 0644,
1006                 .proc_handler   = dirty_background_ratio_handler,
1007                 .extra1         = &zero,
1008                 .extra2         = &one_hundred,
1009         },
1010         {
1011                 .procname       = "dirty_background_bytes",
1012                 .data           = &dirty_background_bytes,
1013                 .maxlen         = sizeof(dirty_background_bytes),
1014                 .mode           = 0644,
1015                 .proc_handler   = dirty_background_bytes_handler,
1016                 .extra1         = &one_ul,
1017         },
1018         {
1019                 .procname       = "dirty_ratio",
1020                 .data           = &vm_dirty_ratio,
1021                 .maxlen         = sizeof(vm_dirty_ratio),
1022                 .mode           = 0644,
1023                 .proc_handler   = dirty_ratio_handler,
1024                 .extra1         = &zero,
1025                 .extra2         = &one_hundred,
1026         },
1027         {
1028                 .procname       = "dirty_bytes",
1029                 .data           = &vm_dirty_bytes,
1030                 .maxlen         = sizeof(vm_dirty_bytes),
1031                 .mode           = 0644,
1032                 .proc_handler   = dirty_bytes_handler,
1033                 .extra1         = &dirty_bytes_min,
1034         },
1035         {
1036                 .procname       = "dirty_writeback_centisecs",
1037                 .data           = &dirty_writeback_interval,
1038                 .maxlen         = sizeof(dirty_writeback_interval),
1039                 .mode           = 0644,
1040                 .proc_handler   = dirty_writeback_centisecs_handler,
1041         },
1042         {
1043                 .procname       = "dirty_expire_centisecs",
1044                 .data           = &dirty_expire_interval,
1045                 .maxlen         = sizeof(dirty_expire_interval),
1046                 .mode           = 0644,
1047                 .proc_handler   = proc_dointvec,
1048         },
1049         {
1050                 .procname       = "nr_pdflush_threads",
1051                 .data           = &nr_pdflush_threads,
1052                 .maxlen         = sizeof nr_pdflush_threads,
1053                 .mode           = 0444 /* read-only*/,
1054                 .proc_handler   = proc_dointvec,
1055         },
1056         {
1057                 .procname       = "swappiness",
1058                 .data           = &vm_swappiness,
1059                 .maxlen         = sizeof(vm_swappiness),
1060                 .mode           = 0644,
1061                 .proc_handler   = proc_dointvec_minmax,
1062                 .extra1         = &zero,
1063                 .extra2         = &one_hundred,
1064         },
1065 #ifdef CONFIG_HUGETLB_PAGE
1066         {
1067                 .procname       = "nr_hugepages",
1068                 .data           = NULL,
1069                 .maxlen         = sizeof(unsigned long),
1070                 .mode           = 0644,
1071                 .proc_handler   = hugetlb_sysctl_handler,
1072                 .extra1         = (void *)&hugetlb_zero,
1073                 .extra2         = (void *)&hugetlb_infinity,
1074         },
1075 #ifdef CONFIG_NUMA
1076         {
1077                 .procname       = "nr_hugepages_mempolicy",
1078                 .data           = NULL,
1079                 .maxlen         = sizeof(unsigned long),
1080                 .mode           = 0644,
1081                 .proc_handler   = &hugetlb_mempolicy_sysctl_handler,
1082                 .extra1         = (void *)&hugetlb_zero,
1083                 .extra2         = (void *)&hugetlb_infinity,
1084         },
1085 #endif
1086          {
1087                 .procname       = "hugetlb_shm_group",
1088                 .data           = &sysctl_hugetlb_shm_group,
1089                 .maxlen         = sizeof(gid_t),
1090                 .mode           = 0644,
1091                 .proc_handler   = proc_dointvec,
1092          },
1093          {
1094                 .procname       = "hugepages_treat_as_movable",
1095                 .data           = &hugepages_treat_as_movable,
1096                 .maxlen         = sizeof(int),
1097                 .mode           = 0644,
1098                 .proc_handler   = hugetlb_treat_movable_handler,
1099         },
1100         {
1101                 .procname       = "nr_overcommit_hugepages",
1102                 .data           = NULL,
1103                 .maxlen         = sizeof(unsigned long),
1104                 .mode           = 0644,
1105                 .proc_handler   = hugetlb_overcommit_handler,
1106                 .extra1         = (void *)&hugetlb_zero,
1107                 .extra2         = (void *)&hugetlb_infinity,
1108         },
1109 #endif
1110         {
1111                 .procname       = "lowmem_reserve_ratio",
1112                 .data           = &sysctl_lowmem_reserve_ratio,
1113                 .maxlen         = sizeof(sysctl_lowmem_reserve_ratio),
1114                 .mode           = 0644,
1115                 .proc_handler   = lowmem_reserve_ratio_sysctl_handler,
1116         },
1117         {
1118                 .procname       = "drop_caches",
1119                 .data           = &sysctl_drop_caches,
1120                 .maxlen         = sizeof(int),
1121                 .mode           = 0644,
1122                 .proc_handler   = drop_caches_sysctl_handler,
1123         },
1124         {
1125                 .procname       = "min_free_kbytes",
1126                 .data           = &min_free_kbytes,
1127                 .maxlen         = sizeof(min_free_kbytes),
1128                 .mode           = 0644,
1129                 .proc_handler   = min_free_kbytes_sysctl_handler,
1130                 .extra1         = &zero,
1131         },
1132         {
1133                 .procname       = "percpu_pagelist_fraction",
1134                 .data           = &percpu_pagelist_fraction,
1135                 .maxlen         = sizeof(percpu_pagelist_fraction),
1136                 .mode           = 0644,
1137                 .proc_handler   = percpu_pagelist_fraction_sysctl_handler,
1138                 .extra1         = &min_percpu_pagelist_fract,
1139         },
1140 #ifdef CONFIG_MMU
1141         {
1142                 .procname       = "max_map_count",
1143                 .data           = &sysctl_max_map_count,
1144                 .maxlen         = sizeof(sysctl_max_map_count),
1145                 .mode           = 0644,
1146                 .proc_handler   = proc_dointvec_minmax,
1147                 .extra1         = &zero,
1148         },
1149 #else
1150         {
1151                 .procname       = "nr_trim_pages",
1152                 .data           = &sysctl_nr_trim_pages,
1153                 .maxlen         = sizeof(sysctl_nr_trim_pages),
1154                 .mode           = 0644,
1155                 .proc_handler   = proc_dointvec_minmax,
1156                 .extra1         = &zero,
1157         },
1158 #endif
1159         {
1160                 .procname       = "laptop_mode",
1161                 .data           = &laptop_mode,
1162                 .maxlen         = sizeof(laptop_mode),
1163                 .mode           = 0644,
1164                 .proc_handler   = proc_dointvec_jiffies,
1165         },
1166         {
1167                 .procname       = "block_dump",
1168                 .data           = &block_dump,
1169                 .maxlen         = sizeof(block_dump),
1170                 .mode           = 0644,
1171                 .proc_handler   = proc_dointvec,
1172                 .extra1         = &zero,
1173         },
1174         {
1175                 .procname       = "vfs_cache_pressure",
1176                 .data           = &sysctl_vfs_cache_pressure,
1177                 .maxlen         = sizeof(sysctl_vfs_cache_pressure),
1178                 .mode           = 0644,
1179                 .proc_handler   = proc_dointvec,
1180                 .extra1         = &zero,
1181         },
1182 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1183         {
1184                 .procname       = "legacy_va_layout",
1185                 .data           = &sysctl_legacy_va_layout,
1186                 .maxlen         = sizeof(sysctl_legacy_va_layout),
1187                 .mode           = 0644,
1188                 .proc_handler   = proc_dointvec,
1189                 .extra1         = &zero,
1190         },
1191 #endif
1192 #ifdef CONFIG_NUMA
1193         {
1194                 .procname       = "zone_reclaim_mode",
1195                 .data           = &zone_reclaim_mode,
1196                 .maxlen         = sizeof(zone_reclaim_mode),
1197                 .mode           = 0644,
1198                 .proc_handler   = proc_dointvec,
1199                 .extra1         = &zero,
1200         },
1201         {
1202                 .procname       = "min_unmapped_ratio",
1203                 .data           = &sysctl_min_unmapped_ratio,
1204                 .maxlen         = sizeof(sysctl_min_unmapped_ratio),
1205                 .mode           = 0644,
1206                 .proc_handler   = sysctl_min_unmapped_ratio_sysctl_handler,
1207                 .extra1         = &zero,
1208                 .extra2         = &one_hundred,
1209         },
1210         {
1211                 .procname       = "min_slab_ratio",
1212                 .data           = &sysctl_min_slab_ratio,
1213                 .maxlen         = sizeof(sysctl_min_slab_ratio),
1214                 .mode           = 0644,
1215                 .proc_handler   = sysctl_min_slab_ratio_sysctl_handler,
1216                 .extra1         = &zero,
1217                 .extra2         = &one_hundred,
1218         },
1219 #endif
1220 #ifdef CONFIG_SMP
1221         {
1222                 .procname       = "stat_interval",
1223                 .data           = &sysctl_stat_interval,
1224                 .maxlen         = sizeof(sysctl_stat_interval),
1225                 .mode           = 0644,
1226                 .proc_handler   = proc_dointvec_jiffies,
1227         },
1228 #endif
1229 #ifdef CONFIG_MMU
1230         {
1231                 .procname       = "mmap_min_addr",
1232                 .data           = &dac_mmap_min_addr,
1233                 .maxlen         = sizeof(unsigned long),
1234                 .mode           = 0644,
1235                 .proc_handler   = mmap_min_addr_handler,
1236         },
1237 #endif
1238 #ifdef CONFIG_NUMA
1239         {
1240                 .procname       = "numa_zonelist_order",
1241                 .data           = &numa_zonelist_order,
1242                 .maxlen         = NUMA_ZONELIST_ORDER_LEN,
1243                 .mode           = 0644,
1244                 .proc_handler   = numa_zonelist_order_handler,
1245         },
1246 #endif
1247 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1248    (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1249         {
1250                 .procname       = "vdso_enabled",
1251                 .data           = &vdso_enabled,
1252                 .maxlen         = sizeof(vdso_enabled),
1253                 .mode           = 0644,
1254                 .proc_handler   = proc_dointvec,
1255                 .extra1         = &zero,
1256         },
1257 #endif
1258 #ifdef CONFIG_HIGHMEM
1259         {
1260                 .procname       = "highmem_is_dirtyable",
1261                 .data           = &vm_highmem_is_dirtyable,
1262                 .maxlen         = sizeof(vm_highmem_is_dirtyable),
1263                 .mode           = 0644,
1264                 .proc_handler   = proc_dointvec_minmax,
1265                 .extra1         = &zero,
1266                 .extra2         = &one,
1267         },
1268 #endif
1269         {
1270                 .procname       = "scan_unevictable_pages",
1271                 .data           = &scan_unevictable_pages,
1272                 .maxlen         = sizeof(scan_unevictable_pages),
1273                 .mode           = 0644,
1274                 .proc_handler   = scan_unevictable_handler,
1275         },
1276 #ifdef CONFIG_MEMORY_FAILURE
1277         {
1278                 .procname       = "memory_failure_early_kill",
1279                 .data           = &sysctl_memory_failure_early_kill,
1280                 .maxlen         = sizeof(sysctl_memory_failure_early_kill),
1281                 .mode           = 0644,
1282                 .proc_handler   = proc_dointvec_minmax,
1283                 .extra1         = &zero,
1284                 .extra2         = &one,
1285         },
1286         {
1287                 .procname       = "memory_failure_recovery",
1288                 .data           = &sysctl_memory_failure_recovery,
1289                 .maxlen         = sizeof(sysctl_memory_failure_recovery),
1290                 .mode           = 0644,
1291                 .proc_handler   = proc_dointvec_minmax,
1292                 .extra1         = &zero,
1293                 .extra2         = &one,
1294         },
1295 #endif
1296
1297 /*
1298  * NOTE: do not add new entries to this table unless you have read
1299  * Documentation/sysctl/ctl_unnumbered.txt
1300  */
1301         { }
1302 };
1303
1304 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1305 static struct ctl_table binfmt_misc_table[] = {
1306         { }
1307 };
1308 #endif
1309
1310 static struct ctl_table fs_table[] = {
1311         {
1312                 .procname       = "inode-nr",
1313                 .data           = &inodes_stat,
1314                 .maxlen         = 2*sizeof(int),
1315                 .mode           = 0444,
1316                 .proc_handler   = proc_dointvec,
1317         },
1318         {
1319                 .procname       = "inode-state",
1320                 .data           = &inodes_stat,
1321                 .maxlen         = 7*sizeof(int),
1322                 .mode           = 0444,
1323                 .proc_handler   = proc_dointvec,
1324         },
1325         {
1326                 .procname       = "file-nr",
1327                 .data           = &files_stat,
1328                 .maxlen         = 3*sizeof(int),
1329                 .mode           = 0444,
1330                 .proc_handler   = proc_nr_files,
1331         },
1332         {
1333                 .procname       = "file-max",
1334                 .data           = &files_stat.max_files,
1335                 .maxlen         = sizeof(int),
1336                 .mode           = 0644,
1337                 .proc_handler   = proc_dointvec,
1338         },
1339         {
1340                 .procname       = "nr_open",
1341                 .data           = &sysctl_nr_open,
1342                 .maxlen         = sizeof(int),
1343                 .mode           = 0644,
1344                 .proc_handler   = proc_dointvec_minmax,
1345                 .extra1         = &sysctl_nr_open_min,
1346                 .extra2         = &sysctl_nr_open_max,
1347         },
1348         {
1349                 .procname       = "dentry-state",
1350                 .data           = &dentry_stat,
1351                 .maxlen         = 6*sizeof(int),
1352                 .mode           = 0444,
1353                 .proc_handler   = proc_dointvec,
1354         },
1355         {
1356                 .procname       = "overflowuid",
1357                 .data           = &fs_overflowuid,
1358                 .maxlen         = sizeof(int),
1359                 .mode           = 0644,
1360                 .proc_handler   = proc_dointvec_minmax,
1361                 .extra1         = &minolduid,
1362                 .extra2         = &maxolduid,
1363         },
1364         {
1365                 .procname       = "overflowgid",
1366                 .data           = &fs_overflowgid,
1367                 .maxlen         = sizeof(int),
1368                 .mode           = 0644,
1369                 .proc_handler   = proc_dointvec_minmax,
1370                 .extra1         = &minolduid,
1371                 .extra2         = &maxolduid,
1372         },
1373 #ifdef CONFIG_FILE_LOCKING
1374         {
1375                 .procname       = "leases-enable",
1376                 .data           = &leases_enable,
1377                 .maxlen         = sizeof(int),
1378                 .mode           = 0644,
1379                 .proc_handler   = proc_dointvec,
1380         },
1381 #endif
1382 #ifdef CONFIG_DNOTIFY
1383         {
1384                 .procname       = "dir-notify-enable",
1385                 .data           = &dir_notify_enable,
1386                 .maxlen         = sizeof(int),
1387                 .mode           = 0644,
1388                 .proc_handler   = proc_dointvec,
1389         },
1390 #endif
1391 #ifdef CONFIG_MMU
1392 #ifdef CONFIG_FILE_LOCKING
1393         {
1394                 .procname       = "lease-break-time",
1395                 .data           = &lease_break_time,
1396                 .maxlen         = sizeof(int),
1397                 .mode           = 0644,
1398                 .proc_handler   = proc_dointvec,
1399         },
1400 #endif
1401 #ifdef CONFIG_AIO
1402         {
1403                 .procname       = "aio-nr",
1404                 .data           = &aio_nr,
1405                 .maxlen         = sizeof(aio_nr),
1406                 .mode           = 0444,
1407                 .proc_handler   = proc_doulongvec_minmax,
1408         },
1409         {
1410                 .procname       = "aio-max-nr",
1411                 .data           = &aio_max_nr,
1412                 .maxlen         = sizeof(aio_max_nr),
1413                 .mode           = 0644,
1414                 .proc_handler   = proc_doulongvec_minmax,
1415         },
1416 #endif /* CONFIG_AIO */
1417 #ifdef CONFIG_INOTIFY_USER
1418         {
1419                 .procname       = "inotify",
1420                 .mode           = 0555,
1421                 .child          = inotify_table,
1422         },
1423 #endif  
1424 #ifdef CONFIG_EPOLL
1425         {
1426                 .procname       = "epoll",
1427                 .mode           = 0555,
1428                 .child          = epoll_table,
1429         },
1430 #endif
1431 #endif
1432         {
1433                 .procname       = "suid_dumpable",
1434                 .data           = &suid_dumpable,
1435                 .maxlen         = sizeof(int),
1436                 .mode           = 0644,
1437                 .proc_handler   = proc_dointvec_minmax,
1438                 .extra1         = &zero,
1439                 .extra2         = &two,
1440         },
1441 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1442         {
1443                 .procname       = "binfmt_misc",
1444                 .mode           = 0555,
1445                 .child          = binfmt_misc_table,
1446         },
1447 #endif
1448 /*
1449  * NOTE: do not add new entries to this table unless you have read
1450  * Documentation/sysctl/ctl_unnumbered.txt
1451  */
1452         { }
1453 };
1454
1455 static struct ctl_table debug_table[] = {
1456 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_SPARC)
1457         {
1458                 .procname       = "exception-trace",
1459                 .data           = &show_unhandled_signals,
1460                 .maxlen         = sizeof(int),
1461                 .mode           = 0644,
1462                 .proc_handler   = proc_dointvec
1463         },
1464 #endif
1465 #if defined(CONFIG_OPTPROBES)
1466         {
1467                 .procname       = "kprobes-optimization",
1468                 .data           = &sysctl_kprobes_optimization,
1469                 .maxlen         = sizeof(int),
1470                 .mode           = 0644,
1471                 .proc_handler   = proc_kprobes_optimization_handler,
1472                 .extra1         = &zero,
1473                 .extra2         = &one,
1474         },
1475 #endif
1476         { }
1477 };
1478
1479 static struct ctl_table dev_table[] = {
1480         { }
1481 };
1482
1483 static DEFINE_SPINLOCK(sysctl_lock);
1484
1485 /* called under sysctl_lock */
1486 static int use_table(struct ctl_table_header *p)
1487 {
1488         if (unlikely(p->unregistering))
1489                 return 0;
1490         p->used++;
1491         return 1;
1492 }
1493
1494 /* called under sysctl_lock */
1495 static void unuse_table(struct ctl_table_header *p)
1496 {
1497         if (!--p->used)
1498                 if (unlikely(p->unregistering))
1499                         complete(p->unregistering);
1500 }
1501
1502 /* called under sysctl_lock, will reacquire if has to wait */
1503 static void start_unregistering(struct ctl_table_header *p)
1504 {
1505         /*
1506          * if p->used is 0, nobody will ever touch that entry again;
1507          * we'll eliminate all paths to it before dropping sysctl_lock
1508          */
1509         if (unlikely(p->used)) {
1510                 struct completion wait;
1511                 init_completion(&wait);
1512                 p->unregistering = &wait;
1513                 spin_unlock(&sysctl_lock);
1514                 wait_for_completion(&wait);
1515                 spin_lock(&sysctl_lock);
1516         } else {
1517                 /* anything non-NULL; we'll never dereference it */
1518                 p->unregistering = ERR_PTR(-EINVAL);
1519         }
1520         /*
1521          * do not remove from the list until nobody holds it; walking the
1522          * list in do_sysctl() relies on that.
1523          */
1524         list_del_init(&p->ctl_entry);
1525 }
1526
1527 void sysctl_head_get(struct ctl_table_header *head)
1528 {
1529         spin_lock(&sysctl_lock);
1530         head->count++;
1531         spin_unlock(&sysctl_lock);
1532 }
1533
1534 void sysctl_head_put(struct ctl_table_header *head)
1535 {
1536         spin_lock(&sysctl_lock);
1537         if (!--head->count)
1538                 kfree(head);
1539         spin_unlock(&sysctl_lock);
1540 }
1541
1542 struct ctl_table_header *sysctl_head_grab(struct ctl_table_header *head)
1543 {
1544         if (!head)
1545                 BUG();
1546         spin_lock(&sysctl_lock);
1547         if (!use_table(head))
1548                 head = ERR_PTR(-ENOENT);
1549         spin_unlock(&sysctl_lock);
1550         return head;
1551 }
1552
1553 void sysctl_head_finish(struct ctl_table_header *head)
1554 {
1555         if (!head)
1556                 return;
1557         spin_lock(&sysctl_lock);
1558         unuse_table(head);
1559         spin_unlock(&sysctl_lock);
1560 }
1561
1562 static struct ctl_table_set *
1563 lookup_header_set(struct ctl_table_root *root, struct nsproxy *namespaces)
1564 {
1565         struct ctl_table_set *set = &root->default_set;
1566         if (root->lookup)
1567                 set = root->lookup(root, namespaces);
1568         return set;
1569 }
1570
1571 static struct list_head *
1572 lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces)
1573 {
1574         struct ctl_table_set *set = lookup_header_set(root, namespaces);
1575         return &set->list;
1576 }
1577
1578 struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces,
1579                                             struct ctl_table_header *prev)
1580 {
1581         struct ctl_table_root *root;
1582         struct list_head *header_list;
1583         struct ctl_table_header *head;
1584         struct list_head *tmp;
1585
1586         spin_lock(&sysctl_lock);
1587         if (prev) {
1588                 head = prev;
1589                 tmp = &prev->ctl_entry;
1590                 unuse_table(prev);
1591                 goto next;
1592         }
1593         tmp = &root_table_header.ctl_entry;
1594         for (;;) {
1595                 head = list_entry(tmp, struct ctl_table_header, ctl_entry);
1596
1597                 if (!use_table(head))
1598                         goto next;
1599                 spin_unlock(&sysctl_lock);
1600                 return head;
1601         next:
1602                 root = head->root;
1603                 tmp = tmp->next;
1604                 header_list = lookup_header_list(root, namespaces);
1605                 if (tmp != header_list)
1606                         continue;
1607
1608                 do {
1609                         root = list_entry(root->root_list.next,
1610                                         struct ctl_table_root, root_list);
1611                         if (root == &sysctl_table_root)
1612                                 goto out;
1613                         header_list = lookup_header_list(root, namespaces);
1614                 } while (list_empty(header_list));
1615                 tmp = header_list->next;
1616         }
1617 out:
1618         spin_unlock(&sysctl_lock);
1619         return NULL;
1620 }
1621
1622 struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev)
1623 {
1624         return __sysctl_head_next(current->nsproxy, prev);
1625 }
1626
1627 void register_sysctl_root(struct ctl_table_root *root)
1628 {
1629         spin_lock(&sysctl_lock);
1630         list_add_tail(&root->root_list, &sysctl_table_root.root_list);
1631         spin_unlock(&sysctl_lock);
1632 }
1633
1634 /*
1635  * sysctl_perm does NOT grant the superuser all rights automatically, because
1636  * some sysctl variables are readonly even to root.
1637  */
1638
1639 static int test_perm(int mode, int op)
1640 {
1641         if (!current_euid())
1642                 mode >>= 6;
1643         else if (in_egroup_p(0))
1644                 mode >>= 3;
1645         if ((op & ~mode & (MAY_READ|MAY_WRITE|MAY_EXEC)) == 0)
1646                 return 0;
1647         return -EACCES;
1648 }
1649
1650 int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op)
1651 {
1652         int error;
1653         int mode;
1654
1655         error = security_sysctl(table, op & (MAY_READ | MAY_WRITE | MAY_EXEC));
1656         if (error)
1657                 return error;
1658
1659         if (root->permissions)
1660                 mode = root->permissions(root, current->nsproxy, table);
1661         else
1662                 mode = table->mode;
1663
1664         return test_perm(mode, op);
1665 }
1666
1667 static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table)
1668 {
1669         for (; table->procname; table++) {
1670                 table->parent = parent;
1671                 if (table->child)
1672                         sysctl_set_parent(table, table->child);
1673         }
1674 }
1675
1676 static __init int sysctl_init(void)
1677 {
1678         sysctl_set_parent(NULL, root_table);
1679 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1680         {
1681                 int err;
1682                 err = sysctl_check_table(current->nsproxy, root_table);
1683         }
1684 #endif
1685         return 0;
1686 }
1687
1688 core_initcall(sysctl_init);
1689
1690 static struct ctl_table *is_branch_in(struct ctl_table *branch,
1691                                       struct ctl_table *table)
1692 {
1693         struct ctl_table *p;
1694         const char *s = branch->procname;
1695
1696         /* branch should have named subdirectory as its first element */
1697         if (!s || !branch->child)
1698                 return NULL;
1699
1700         /* ... and nothing else */
1701         if (branch[1].procname)
1702                 return NULL;
1703
1704         /* table should contain subdirectory with the same name */
1705         for (p = table; p->procname; p++) {
1706                 if (!p->child)
1707                         continue;
1708                 if (p->procname && strcmp(p->procname, s) == 0)
1709                         return p;
1710         }
1711         return NULL;
1712 }
1713
1714 /* see if attaching q to p would be an improvement */
1715 static void try_attach(struct ctl_table_header *p, struct ctl_table_header *q)
1716 {
1717         struct ctl_table *to = p->ctl_table, *by = q->ctl_table;
1718         struct ctl_table *next;
1719         int is_better = 0;
1720         int not_in_parent = !p->attached_by;
1721
1722         while ((next = is_branch_in(by, to)) != NULL) {
1723                 if (by == q->attached_by)
1724                         is_better = 1;
1725                 if (to == p->attached_by)
1726                         not_in_parent = 1;
1727                 by = by->child;
1728                 to = next->child;
1729         }
1730
1731         if (is_better && not_in_parent) {
1732                 q->attached_by = by;
1733                 q->attached_to = to;
1734                 q->parent = p;
1735         }
1736 }
1737
1738 /**
1739  * __register_sysctl_paths - register a sysctl hierarchy
1740  * @root: List of sysctl headers to register on
1741  * @namespaces: Data to compute which lists of sysctl entries are visible
1742  * @path: The path to the directory the sysctl table is in.
1743  * @table: the top-level table structure
1744  *
1745  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1746  * array. A completely 0 filled entry terminates the table.
1747  *
1748  * The members of the &struct ctl_table structure are used as follows:
1749  *
1750  * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1751  *            enter a sysctl file
1752  *
1753  * data - a pointer to data for use by proc_handler
1754  *
1755  * maxlen - the maximum size in bytes of the data
1756  *
1757  * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1758  *
1759  * child - a pointer to the child sysctl table if this entry is a directory, or
1760  *         %NULL.
1761  *
1762  * proc_handler - the text handler routine (described below)
1763  *
1764  * de - for internal use by the sysctl routines
1765  *
1766  * extra1, extra2 - extra pointers usable by the proc handler routines
1767  *
1768  * Leaf nodes in the sysctl tree will be represented by a single file
1769  * under /proc; non-leaf nodes will be represented by directories.
1770  *
1771  * sysctl(2) can automatically manage read and write requests through
1772  * the sysctl table.  The data and maxlen fields of the ctl_table
1773  * struct enable minimal validation of the values being written to be
1774  * performed, and the mode field allows minimal authentication.
1775  *
1776  * There must be a proc_handler routine for any terminal nodes
1777  * mirrored under /proc/sys (non-terminals are handled by a built-in
1778  * directory handler).  Several default handlers are available to
1779  * cover common cases -
1780  *
1781  * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1782  * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(), 
1783  * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1784  *
1785  * It is the handler's job to read the input buffer from user memory
1786  * and process it. The handler should return 0 on success.
1787  *
1788  * This routine returns %NULL on a failure to register, and a pointer
1789  * to the table header on success.
1790  */
1791 struct ctl_table_header *__register_sysctl_paths(
1792         struct ctl_table_root *root,
1793         struct nsproxy *namespaces,
1794         const struct ctl_path *path, struct ctl_table *table)
1795 {
1796         struct ctl_table_header *header;
1797         struct ctl_table *new, **prevp;
1798         unsigned int n, npath;
1799         struct ctl_table_set *set;
1800
1801         /* Count the path components */
1802         for (npath = 0; path[npath].procname; ++npath)
1803                 ;
1804
1805         /*
1806          * For each path component, allocate a 2-element ctl_table array.
1807          * The first array element will be filled with the sysctl entry
1808          * for this, the second will be the sentinel (procname == 0).
1809          *
1810          * We allocate everything in one go so that we don't have to
1811          * worry about freeing additional memory in unregister_sysctl_table.
1812          */
1813         header = kzalloc(sizeof(struct ctl_table_header) +
1814                          (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL);
1815         if (!header)
1816                 return NULL;
1817
1818         new = (struct ctl_table *) (header + 1);
1819
1820         /* Now connect the dots */
1821         prevp = &header->ctl_table;
1822         for (n = 0; n < npath; ++n, ++path) {
1823                 /* Copy the procname */
1824                 new->procname = path->procname;
1825                 new->mode     = 0555;
1826
1827                 *prevp = new;
1828                 prevp = &new->child;
1829
1830                 new += 2;
1831         }
1832         *prevp = table;
1833         header->ctl_table_arg = table;
1834
1835         INIT_LIST_HEAD(&header->ctl_entry);
1836         header->used = 0;
1837         header->unregistering = NULL;
1838         header->root = root;
1839         sysctl_set_parent(NULL, header->ctl_table);
1840         header->count = 1;
1841 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1842         if (sysctl_check_table(namespaces, header->ctl_table)) {
1843                 kfree(header);
1844                 return NULL;
1845         }
1846 #endif
1847         spin_lock(&sysctl_lock);
1848         header->set = lookup_header_set(root, namespaces);
1849         header->attached_by = header->ctl_table;
1850         header->attached_to = root_table;
1851         header->parent = &root_table_header;
1852         for (set = header->set; set; set = set->parent) {
1853                 struct ctl_table_header *p;
1854                 list_for_each_entry(p, &set->list, ctl_entry) {
1855                         if (p->unregistering)
1856                                 continue;
1857                         try_attach(p, header);
1858                 }
1859         }
1860         header->parent->count++;
1861         list_add_tail(&header->ctl_entry, &header->set->list);
1862         spin_unlock(&sysctl_lock);
1863
1864         return header;
1865 }
1866
1867 /**
1868  * register_sysctl_table_path - register a sysctl table hierarchy
1869  * @path: The path to the directory the sysctl table is in.
1870  * @table: the top-level table structure
1871  *
1872  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1873  * array. A completely 0 filled entry terminates the table.
1874  *
1875  * See __register_sysctl_paths for more details.
1876  */
1877 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1878                                                 struct ctl_table *table)
1879 {
1880         return __register_sysctl_paths(&sysctl_table_root, current->nsproxy,
1881                                         path, table);
1882 }
1883
1884 /**
1885  * register_sysctl_table - register a sysctl table hierarchy
1886  * @table: the top-level table structure
1887  *
1888  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1889  * array. A completely 0 filled entry terminates the table.
1890  *
1891  * See register_sysctl_paths for more details.
1892  */
1893 struct ctl_table_header *register_sysctl_table(struct ctl_table *table)
1894 {
1895         static const struct ctl_path null_path[] = { {} };
1896
1897         return register_sysctl_paths(null_path, table);
1898 }
1899
1900 /**
1901  * unregister_sysctl_table - unregister a sysctl table hierarchy
1902  * @header: the header returned from register_sysctl_table
1903  *
1904  * Unregisters the sysctl table and all children. proc entries may not
1905  * actually be removed until they are no longer used by anyone.
1906  */
1907 void unregister_sysctl_table(struct ctl_table_header * header)
1908 {
1909         might_sleep();
1910
1911         if (header == NULL)
1912                 return;
1913
1914         spin_lock(&sysctl_lock);
1915         start_unregistering(header);
1916         if (!--header->parent->count) {
1917                 WARN_ON(1);
1918                 kfree(header->parent);
1919         }
1920         if (!--header->count)
1921                 kfree(header);
1922         spin_unlock(&sysctl_lock);
1923 }
1924
1925 int sysctl_is_seen(struct ctl_table_header *p)
1926 {
1927         struct ctl_table_set *set = p->set;
1928         int res;
1929         spin_lock(&sysctl_lock);
1930         if (p->unregistering)
1931                 res = 0;
1932         else if (!set->is_seen)
1933                 res = 1;
1934         else
1935                 res = set->is_seen(set);
1936         spin_unlock(&sysctl_lock);
1937         return res;
1938 }
1939
1940 void setup_sysctl_set(struct ctl_table_set *p,
1941         struct ctl_table_set *parent,
1942         int (*is_seen)(struct ctl_table_set *))
1943 {
1944         INIT_LIST_HEAD(&p->list);
1945         p->parent = parent ? parent : &sysctl_table_root.default_set;
1946         p->is_seen = is_seen;
1947 }
1948
1949 #else /* !CONFIG_SYSCTL */
1950 struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
1951 {
1952         return NULL;
1953 }
1954
1955 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1956                                                     struct ctl_table *table)
1957 {
1958         return NULL;
1959 }
1960
1961 void unregister_sysctl_table(struct ctl_table_header * table)
1962 {
1963 }
1964
1965 void setup_sysctl_set(struct ctl_table_set *p,
1966         struct ctl_table_set *parent,
1967         int (*is_seen)(struct ctl_table_set *))
1968 {
1969 }
1970
1971 void sysctl_head_put(struct ctl_table_header *head)
1972 {
1973 }
1974
1975 #endif /* CONFIG_SYSCTL */
1976
1977 /*
1978  * /proc/sys support
1979  */
1980
1981 #ifdef CONFIG_PROC_SYSCTL
1982
1983 static int _proc_do_string(void* data, int maxlen, int write,
1984                            void __user *buffer,
1985                            size_t *lenp, loff_t *ppos)
1986 {
1987         size_t len;
1988         char __user *p;
1989         char c;
1990
1991         if (!data || !maxlen || !*lenp) {
1992                 *lenp = 0;
1993                 return 0;
1994         }
1995
1996         if (write) {
1997                 len = 0;
1998                 p = buffer;
1999                 while (len < *lenp) {
2000                         if (get_user(c, p++))
2001                                 return -EFAULT;
2002                         if (c == 0 || c == '\n')
2003                                 break;
2004                         len++;
2005                 }
2006                 if (len >= maxlen)
2007                         len = maxlen-1;
2008                 if(copy_from_user(data, buffer, len))
2009                         return -EFAULT;
2010                 ((char *) data)[len] = 0;
2011                 *ppos += *lenp;
2012         } else {
2013                 len = strlen(data);
2014                 if (len > maxlen)
2015                         len = maxlen;
2016
2017                 if (*ppos > len) {
2018                         *lenp = 0;
2019                         return 0;
2020                 }
2021
2022                 data += *ppos;
2023                 len  -= *ppos;
2024
2025                 if (len > *lenp)
2026                         len = *lenp;
2027                 if (len)
2028                         if(copy_to_user(buffer, data, len))
2029                                 return -EFAULT;
2030                 if (len < *lenp) {
2031                         if(put_user('\n', ((char __user *) buffer) + len))
2032                                 return -EFAULT;
2033                         len++;
2034                 }
2035                 *lenp = len;
2036                 *ppos += len;
2037         }
2038         return 0;
2039 }
2040
2041 /**
2042  * proc_dostring - read a string sysctl
2043  * @table: the sysctl table
2044  * @write: %TRUE if this is a write to the sysctl file
2045  * @buffer: the user buffer
2046  * @lenp: the size of the user buffer
2047  * @ppos: file position
2048  *
2049  * Reads/writes a string from/to the user buffer. If the kernel
2050  * buffer provided is not large enough to hold the string, the
2051  * string is truncated. The copied string is %NULL-terminated.
2052  * If the string is being read by the user process, it is copied
2053  * and a newline '\n' is added. It is truncated if the buffer is
2054  * not large enough.
2055  *
2056  * Returns 0 on success.
2057  */
2058 int proc_dostring(struct ctl_table *table, int write,
2059                   void __user *buffer, size_t *lenp, loff_t *ppos)
2060 {
2061         return _proc_do_string(table->data, table->maxlen, write,
2062                                buffer, lenp, ppos);
2063 }
2064
2065
2066 static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp,
2067                                  int *valp,
2068                                  int write, void *data)
2069 {
2070         if (write) {
2071                 *valp = *negp ? -*lvalp : *lvalp;
2072         } else {
2073                 int val = *valp;
2074                 if (val < 0) {
2075                         *negp = -1;
2076                         *lvalp = (unsigned long)-val;
2077                 } else {
2078                         *negp = 0;
2079                         *lvalp = (unsigned long)val;
2080                 }
2081         }
2082         return 0;
2083 }
2084
2085 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
2086                   int write, void __user *buffer,
2087                   size_t *lenp, loff_t *ppos,
2088                   int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2089                               int write, void *data),
2090                   void *data)
2091 {
2092 #define TMPBUFLEN 21
2093         int *i, vleft, first = 1, neg;
2094         unsigned long lval;
2095         size_t left, len;
2096         
2097         char buf[TMPBUFLEN], *p;
2098         char __user *s = buffer;
2099         
2100         if (!tbl_data || !table->maxlen || !*lenp ||
2101             (*ppos && !write)) {
2102                 *lenp = 0;
2103                 return 0;
2104         }
2105         
2106         i = (int *) tbl_data;
2107         vleft = table->maxlen / sizeof(*i);
2108         left = *lenp;
2109
2110         if (!conv)
2111                 conv = do_proc_dointvec_conv;
2112
2113         for (; left && vleft--; i++, first=0) {
2114                 if (write) {
2115                         while (left) {
2116                                 char c;
2117                                 if (get_user(c, s))
2118                                         return -EFAULT;
2119                                 if (!isspace(c))
2120                                         break;
2121                                 left--;
2122                                 s++;
2123                         }
2124                         if (!left)
2125                                 break;
2126                         neg = 0;
2127                         len = left;
2128                         if (len > sizeof(buf) - 1)
2129                                 len = sizeof(buf) - 1;
2130                         if (copy_from_user(buf, s, len))
2131                                 return -EFAULT;
2132                         buf[len] = 0;
2133                         p = buf;
2134                         if (*p == '-' && left > 1) {
2135                                 neg = 1;
2136                                 p++;
2137                         }
2138                         if (*p < '0' || *p > '9')
2139                                 break;
2140
2141                         lval = simple_strtoul(p, &p, 0);
2142
2143                         len = p-buf;
2144                         if ((len < left) && *p && !isspace(*p))
2145                                 break;
2146                         s += len;
2147                         left -= len;
2148
2149                         if (conv(&neg, &lval, i, 1, data))
2150                                 break;
2151                 } else {
2152                         p = buf;
2153                         if (!first)
2154                                 *p++ = '\t';
2155         
2156                         if (conv(&neg, &lval, i, 0, data))
2157                                 break;
2158
2159                         sprintf(p, "%s%lu", neg ? "-" : "", lval);
2160                         len = strlen(buf);
2161                         if (len > left)
2162                                 len = left;
2163                         if(copy_to_user(s, buf, len))
2164                                 return -EFAULT;
2165                         left -= len;
2166                         s += len;
2167                 }
2168         }
2169
2170         if (!write && !first && left) {
2171                 if(put_user('\n', s))
2172                         return -EFAULT;
2173                 left--, s++;
2174         }
2175         if (write) {
2176                 while (left) {
2177                         char c;
2178                         if (get_user(c, s++))
2179                                 return -EFAULT;
2180                         if (!isspace(c))
2181                                 break;
2182                         left--;
2183                 }
2184         }
2185         if (write && first)
2186                 return -EINVAL;
2187         *lenp -= left;
2188         *ppos += *lenp;
2189         return 0;
2190 #undef TMPBUFLEN
2191 }
2192
2193 static int do_proc_dointvec(struct ctl_table *table, int write,
2194                   void __user *buffer, size_t *lenp, loff_t *ppos,
2195                   int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2196                               int write, void *data),
2197                   void *data)
2198 {
2199         return __do_proc_dointvec(table->data, table, write,
2200                         buffer, lenp, ppos, conv, data);
2201 }
2202
2203 /**
2204  * proc_dointvec - read a vector of integers
2205  * @table: the sysctl table
2206  * @write: %TRUE if this is a write to the sysctl file
2207  * @buffer: the user buffer
2208  * @lenp: the size of the user buffer
2209  * @ppos: file position
2210  *
2211  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2212  * values from/to the user buffer, treated as an ASCII string. 
2213  *
2214  * Returns 0 on success.
2215  */
2216 int proc_dointvec(struct ctl_table *table, int write,
2217                      void __user *buffer, size_t *lenp, loff_t *ppos)
2218 {
2219     return do_proc_dointvec(table,write,buffer,lenp,ppos,
2220                             NULL,NULL);
2221 }
2222
2223 /*
2224  * Taint values can only be increased
2225  * This means we can safely use a temporary.
2226  */
2227 static int proc_taint(struct ctl_table *table, int write,
2228                                void __user *buffer, size_t *lenp, loff_t *ppos)
2229 {
2230         struct ctl_table t;
2231         unsigned long tmptaint = get_taint();
2232         int err;
2233
2234         if (write && !capable(CAP_SYS_ADMIN))
2235                 return -EPERM;
2236
2237         t = *table;
2238         t.data = &tmptaint;
2239         err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2240         if (err < 0)
2241                 return err;
2242
2243         if (write) {
2244                 /*
2245                  * Poor man's atomic or. Not worth adding a primitive
2246                  * to everyone's atomic.h for this
2247                  */
2248                 int i;
2249                 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2250                         if ((tmptaint >> i) & 1)
2251                                 add_taint(i);
2252                 }
2253         }
2254
2255         return err;
2256 }
2257
2258 struct do_proc_dointvec_minmax_conv_param {
2259         int *min;
2260         int *max;
2261 };
2262
2263 static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp, 
2264                                         int *valp, 
2265                                         int write, void *data)
2266 {
2267         struct do_proc_dointvec_minmax_conv_param *param = data;
2268         if (write) {
2269                 int val = *negp ? -*lvalp : *lvalp;
2270                 if ((param->min && *param->min > val) ||
2271                     (param->max && *param->max < val))
2272                         return -EINVAL;
2273                 *valp = val;
2274         } else {
2275                 int val = *valp;
2276                 if (val < 0) {
2277                         *negp = -1;
2278                         *lvalp = (unsigned long)-val;
2279                 } else {
2280                         *negp = 0;
2281                         *lvalp = (unsigned long)val;
2282                 }
2283         }
2284         return 0;
2285 }
2286
2287 /**
2288  * proc_dointvec_minmax - read a vector of integers with min/max values
2289  * @table: the sysctl table
2290  * @write: %TRUE if this is a write to the sysctl file
2291  * @buffer: the user buffer
2292  * @lenp: the size of the user buffer
2293  * @ppos: file position
2294  *
2295  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2296  * values from/to the user buffer, treated as an ASCII string.
2297  *
2298  * This routine will ensure the values are within the range specified by
2299  * table->extra1 (min) and table->extra2 (max).
2300  *
2301  * Returns 0 on success.
2302  */
2303 int proc_dointvec_minmax(struct ctl_table *table, int write,
2304                   void __user *buffer, size_t *lenp, loff_t *ppos)
2305 {
2306         struct do_proc_dointvec_minmax_conv_param param = {
2307                 .min = (int *) table->extra1,
2308                 .max = (int *) table->extra2,
2309         };
2310         return do_proc_dointvec(table, write, buffer, lenp, ppos,
2311                                 do_proc_dointvec_minmax_conv, &param);
2312 }
2313
2314 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2315                                      void __user *buffer,
2316                                      size_t *lenp, loff_t *ppos,
2317                                      unsigned long convmul,
2318                                      unsigned long convdiv)
2319 {
2320 #define TMPBUFLEN 21
2321         unsigned long *i, *min, *max, val;
2322         int vleft, first=1, neg;
2323         size_t len, left;
2324         char buf[TMPBUFLEN], *p;
2325         char __user *s = buffer;
2326         
2327         if (!data || !table->maxlen || !*lenp ||
2328             (*ppos && !write)) {
2329                 *lenp = 0;
2330                 return 0;
2331         }
2332         
2333         i = (unsigned long *) data;
2334         min = (unsigned long *) table->extra1;
2335         max = (unsigned long *) table->extra2;
2336         vleft = table->maxlen / sizeof(unsigned long);
2337         left = *lenp;
2338         
2339         for (; left && vleft--; i++, min++, max++, first=0) {
2340                 if (write) {
2341                         while (left) {
2342                                 char c;
2343                                 if (get_user(c, s))
2344                                         return -EFAULT;
2345                                 if (!isspace(c))
2346                                         break;
2347                                 left--;
2348                                 s++;
2349                         }
2350                         if (!left)
2351                                 break;
2352                         neg = 0;
2353                         len = left;
2354                         if (len > TMPBUFLEN-1)
2355                                 len = TMPBUFLEN-1;
2356                         if (copy_from_user(buf, s, len))
2357                                 return -EFAULT;
2358                         buf[len] = 0;
2359                         p = buf;
2360                         if (*p == '-' && left > 1) {
2361                                 neg = 1;
2362                                 p++;
2363                         }
2364                         if (*p < '0' || *p > '9')
2365                                 break;
2366                         val = simple_strtoul(p, &p, 0) * convmul / convdiv ;
2367                         len = p-buf;
2368                         if ((len < left) && *p && !isspace(*p))
2369                                 break;
2370                         if (neg)
2371                                 val = -val;
2372                         s += len;
2373                         left -= len;
2374
2375                         if(neg)
2376                                 continue;
2377                         if ((min && val < *min) || (max && val > *max))
2378                                 continue;
2379                         *i = val;
2380                 } else {
2381                         p = buf;
2382                         if (!first)
2383                                 *p++ = '\t';
2384                         sprintf(p, "%lu", convdiv * (*i) / convmul);
2385                         len = strlen(buf);
2386                         if (len > left)
2387                                 len = left;
2388                         if(copy_to_user(s, buf, len))
2389                                 return -EFAULT;
2390                         left -= len;
2391                         s += len;
2392                 }
2393         }
2394
2395         if (!write && !first && left) {
2396                 if(put_user('\n', s))
2397                         return -EFAULT;
2398                 left--, s++;
2399         }
2400         if (write) {
2401                 while (left) {
2402                         char c;
2403                         if (get_user(c, s++))
2404                                 return -EFAULT;
2405                         if (!isspace(c))
2406                                 break;
2407                         left--;
2408                 }
2409         }
2410         if (write && first)
2411                 return -EINVAL;
2412         *lenp -= left;
2413         *ppos += *lenp;
2414         return 0;
2415 #undef TMPBUFLEN
2416 }
2417
2418 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2419                                      void __user *buffer,
2420                                      size_t *lenp, loff_t *ppos,
2421                                      unsigned long convmul,
2422                                      unsigned long convdiv)
2423 {
2424         return __do_proc_doulongvec_minmax(table->data, table, write,
2425                         buffer, lenp, ppos, convmul, convdiv);
2426 }
2427
2428 /**
2429  * proc_doulongvec_minmax - read a vector of long integers with min/max values
2430  * @table: the sysctl table
2431  * @write: %TRUE if this is a write to the sysctl file
2432  * @buffer: the user buffer
2433  * @lenp: the size of the user buffer
2434  * @ppos: file position
2435  *
2436  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2437  * values from/to the user buffer, treated as an ASCII string.
2438  *
2439  * This routine will ensure the values are within the range specified by
2440  * table->extra1 (min) and table->extra2 (max).
2441  *
2442  * Returns 0 on success.
2443  */
2444 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2445                            void __user *buffer, size_t *lenp, loff_t *ppos)
2446 {
2447     return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2448 }
2449
2450 /**
2451  * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2452  * @table: the sysctl table
2453  * @write: %TRUE if this is a write to the sysctl file
2454  * @buffer: the user buffer
2455  * @lenp: the size of the user buffer
2456  * @ppos: file position
2457  *
2458  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2459  * values from/to the user buffer, treated as an ASCII string. The values
2460  * are treated as milliseconds, and converted to jiffies when they are stored.
2461  *
2462  * This routine will ensure the values are within the range specified by
2463  * table->extra1 (min) and table->extra2 (max).
2464  *
2465  * Returns 0 on success.
2466  */
2467 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2468                                       void __user *buffer,
2469                                       size_t *lenp, loff_t *ppos)
2470 {
2471     return do_proc_doulongvec_minmax(table, write, buffer,
2472                                      lenp, ppos, HZ, 1000l);
2473 }
2474
2475
2476 static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp,
2477                                          int *valp,
2478                                          int write, void *data)
2479 {
2480         if (write) {
2481                 if (*lvalp > LONG_MAX / HZ)
2482                         return 1;
2483                 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2484         } else {
2485                 int val = *valp;
2486                 unsigned long lval;
2487                 if (val < 0) {
2488                         *negp = -1;
2489                         lval = (unsigned long)-val;
2490                 } else {
2491                         *negp = 0;
2492                         lval = (unsigned long)val;
2493                 }
2494                 *lvalp = lval / HZ;
2495         }
2496         return 0;
2497 }
2498
2499 static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp,
2500                                                 int *valp,
2501                                                 int write, void *data)
2502 {
2503         if (write) {
2504                 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2505                         return 1;
2506                 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2507         } else {
2508                 int val = *valp;
2509                 unsigned long lval;
2510                 if (val < 0) {
2511                         *negp = -1;
2512                         lval = (unsigned long)-val;
2513                 } else {
2514                         *negp = 0;
2515                         lval = (unsigned long)val;
2516                 }
2517                 *lvalp = jiffies_to_clock_t(lval);
2518         }
2519         return 0;
2520 }
2521
2522 static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp,
2523                                             int *valp,
2524                                             int write, void *data)
2525 {
2526         if (write) {
2527                 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2528         } else {
2529                 int val = *valp;
2530                 unsigned long lval;
2531                 if (val < 0) {
2532                         *negp = -1;
2533                         lval = (unsigned long)-val;
2534                 } else {
2535                         *negp = 0;
2536                         lval = (unsigned long)val;
2537                 }
2538                 *lvalp = jiffies_to_msecs(lval);
2539         }
2540         return 0;
2541 }
2542
2543 /**
2544  * proc_dointvec_jiffies - read a vector of integers as seconds
2545  * @table: the sysctl table
2546  * @write: %TRUE if this is a write to the sysctl file
2547  * @buffer: the user buffer
2548  * @lenp: the size of the user buffer
2549  * @ppos: file position
2550  *
2551  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2552  * values from/to the user buffer, treated as an ASCII string. 
2553  * The values read are assumed to be in seconds, and are converted into
2554  * jiffies.
2555  *
2556  * Returns 0 on success.
2557  */
2558 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2559                           void __user *buffer, size_t *lenp, loff_t *ppos)
2560 {
2561     return do_proc_dointvec(table,write,buffer,lenp,ppos,
2562                             do_proc_dointvec_jiffies_conv,NULL);
2563 }
2564
2565 /**
2566  * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2567  * @table: the sysctl table
2568  * @write: %TRUE if this is a write to the sysctl file
2569  * @buffer: the user buffer
2570  * @lenp: the size of the user buffer
2571  * @ppos: pointer to the file position
2572  *
2573  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2574  * values from/to the user buffer, treated as an ASCII string. 
2575  * The values read are assumed to be in 1/USER_HZ seconds, and 
2576  * are converted into jiffies.
2577  *
2578  * Returns 0 on success.
2579  */
2580 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2581                                  void __user *buffer, size_t *lenp, loff_t *ppos)
2582 {
2583     return do_proc_dointvec(table,write,buffer,lenp,ppos,
2584                             do_proc_dointvec_userhz_jiffies_conv,NULL);
2585 }
2586
2587 /**
2588  * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2589  * @table: the sysctl table
2590  * @write: %TRUE if this is a write to the sysctl file
2591  * @buffer: the user buffer
2592  * @lenp: the size of the user buffer
2593  * @ppos: file position
2594  * @ppos: the current position in the file
2595  *
2596  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2597  * values from/to the user buffer, treated as an ASCII string. 
2598  * The values read are assumed to be in 1/1000 seconds, and 
2599  * are converted into jiffies.
2600  *
2601  * Returns 0 on success.
2602  */
2603 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2604                              void __user *buffer, size_t *lenp, loff_t *ppos)
2605 {
2606         return do_proc_dointvec(table, write, buffer, lenp, ppos,
2607                                 do_proc_dointvec_ms_jiffies_conv, NULL);
2608 }
2609
2610 static int proc_do_cad_pid(struct ctl_table *table, int write,
2611                            void __user *buffer, size_t *lenp, loff_t *ppos)
2612 {
2613         struct pid *new_pid;
2614         pid_t tmp;
2615         int r;
2616
2617         tmp = pid_vnr(cad_pid);
2618
2619         r = __do_proc_dointvec(&tmp, table, write, buffer,
2620                                lenp, ppos, NULL, NULL);
2621         if (r || !write)
2622                 return r;
2623
2624         new_pid = find_get_pid(tmp);
2625         if (!new_pid)
2626                 return -ESRCH;
2627
2628         put_pid(xchg(&cad_pid, new_pid));
2629         return 0;
2630 }
2631
2632 #else /* CONFIG_PROC_FS */
2633
2634 int proc_dostring(struct ctl_table *table, int write,
2635                   void __user *buffer, size_t *lenp, loff_t *ppos)
2636 {
2637         return -ENOSYS;
2638 }
2639
2640 int proc_dointvec(struct ctl_table *table, int write,
2641                   void __user *buffer, size_t *lenp, loff_t *ppos)
2642 {
2643         return -ENOSYS;
2644 }
2645
2646 int proc_dointvec_minmax(struct ctl_table *table, int write,
2647                     void __user *buffer, size_t *lenp, loff_t *ppos)
2648 {
2649         return -ENOSYS;
2650 }
2651
2652 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2653                     void __user *buffer, size_t *lenp, loff_t *ppos)
2654 {
2655         return -ENOSYS;
2656 }
2657
2658 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2659                     void __user *buffer, size_t *lenp, loff_t *ppos)
2660 {
2661         return -ENOSYS;
2662 }
2663
2664 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2665                              void __user *buffer, size_t *lenp, loff_t *ppos)
2666 {
2667         return -ENOSYS;
2668 }
2669
2670 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2671                     void __user *buffer, size_t *lenp, loff_t *ppos)
2672 {
2673         return -ENOSYS;
2674 }
2675
2676 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2677                                       void __user *buffer,
2678                                       size_t *lenp, loff_t *ppos)
2679 {
2680     return -ENOSYS;
2681 }
2682
2683
2684 #endif /* CONFIG_PROC_FS */
2685
2686 /*
2687  * No sense putting this after each symbol definition, twice,
2688  * exception granted :-)
2689  */
2690 EXPORT_SYMBOL(proc_dointvec);
2691 EXPORT_SYMBOL(proc_dointvec_jiffies);
2692 EXPORT_SYMBOL(proc_dointvec_minmax);
2693 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2694 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2695 EXPORT_SYMBOL(proc_dostring);
2696 EXPORT_SYMBOL(proc_doulongvec_minmax);
2697 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
2698 EXPORT_SYMBOL(register_sysctl_table);
2699 EXPORT_SYMBOL(register_sysctl_paths);
2700 EXPORT_SYMBOL(unregister_sysctl_table);