b125e3387568cc1c9c59b1cce982302a7693a40f
[linux-2.6.git] / kernel / sysctl.c
1 /*
2  * sysctl.c: General linux system control interface
3  *
4  * Begun 24 March 1995, Stephen Tweedie
5  * Added /proc support, Dec 1995
6  * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
7  * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
8  * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
9  * Dynamic registration fixes, Stephen Tweedie.
10  * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
11  * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
12  *  Horn.
13  * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
14  * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
15  * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
16  *  Wendling.
17  * The list_for_each() macro wasn't appropriate for the sysctl loop.
18  *  Removed it and replaced it with older style, 03/23/00, Bill Wendling
19  */
20
21 #include <linux/module.h>
22 #include <linux/mm.h>
23 #include <linux/swap.h>
24 #include <linux/slab.h>
25 #include <linux/sysctl.h>
26 #include <linux/proc_fs.h>
27 #include <linux/security.h>
28 #include <linux/ctype.h>
29 #include <linux/utsname.h>
30 #include <linux/smp_lock.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/hugetlb.h>
40 #include <linux/initrd.h>
41 #include <linux/key.h>
42 #include <linux/times.h>
43 #include <linux/limits.h>
44 #include <linux/dcache.h>
45 #include <linux/syscalls.h>
46 #include <linux/vmstat.h>
47 #include <linux/nfs_fs.h>
48 #include <linux/acpi.h>
49 #include <linux/reboot.h>
50 #include <linux/ftrace.h>
51 #include <linux/slow-work.h>
52
53 #include <asm/uaccess.h>
54 #include <asm/processor.h>
55
56 #ifdef CONFIG_X86
57 #include <asm/nmi.h>
58 #include <asm/stacktrace.h>
59 #include <asm/io.h>
60 #endif
61
62 static int deprecated_sysctl_warning(struct __sysctl_args *args);
63
64 #if defined(CONFIG_SYSCTL)
65
66 /* External variables not in a header file. */
67 extern int C_A_D;
68 extern int print_fatal_signals;
69 extern int sysctl_overcommit_memory;
70 extern int sysctl_overcommit_ratio;
71 extern int sysctl_panic_on_oom;
72 extern int sysctl_oom_kill_allocating_task;
73 extern int sysctl_oom_dump_tasks;
74 extern int max_threads;
75 extern int core_uses_pid;
76 extern int suid_dumpable;
77 extern char core_pattern[];
78 extern int pid_max;
79 extern int min_free_kbytes;
80 extern int pid_max_min, pid_max_max;
81 extern int sysctl_drop_caches;
82 extern int percpu_pagelist_fraction;
83 extern int compat_log;
84 extern int latencytop_enabled;
85 extern int sysctl_nr_open_min, sysctl_nr_open_max;
86 #ifndef CONFIG_MMU
87 extern int sysctl_nr_trim_pages;
88 #endif
89 #ifdef CONFIG_RCU_TORTURE_TEST
90 extern int rcutorture_runnable;
91 #endif /* #ifdef CONFIG_RCU_TORTURE_TEST */
92
93 /* Constants used for minimum and  maximum */
94 #ifdef CONFIG_DETECT_SOFTLOCKUP
95 static int sixty = 60;
96 static int neg_one = -1;
97 #endif
98
99 static int zero;
100 static int __maybe_unused one = 1;
101 static int __maybe_unused two = 2;
102 static unsigned long one_ul = 1;
103 static int one_hundred = 100;
104
105 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
106 static int maxolduid = 65535;
107 static int minolduid;
108 static int min_percpu_pagelist_fract = 8;
109
110 static int ngroups_max = NGROUPS_MAX;
111
112 #ifdef CONFIG_MODULES
113 extern char modprobe_path[];
114 #endif
115 #ifdef CONFIG_CHR_DEV_SG
116 extern int sg_big_buff;
117 #endif
118
119 #ifdef CONFIG_SPARC
120 #include <asm/system.h>
121 #endif
122
123 #ifdef CONFIG_SPARC64
124 extern int sysctl_tsb_ratio;
125 #endif
126
127 #ifdef __hppa__
128 extern int pwrsw_enabled;
129 extern int unaligned_enabled;
130 #endif
131
132 #ifdef CONFIG_S390
133 #ifdef CONFIG_MATHEMU
134 extern int sysctl_ieee_emulation_warnings;
135 #endif
136 extern int sysctl_userprocess_debug;
137 extern int spin_retry;
138 #endif
139
140 #ifdef CONFIG_BSD_PROCESS_ACCT
141 extern int acct_parm[];
142 #endif
143
144 #ifdef CONFIG_IA64
145 extern int no_unaligned_warning;
146 extern int unaligned_dump_stack;
147 #endif
148
149 #ifdef CONFIG_RT_MUTEXES
150 extern int max_lock_depth;
151 #endif
152
153 #ifdef CONFIG_PROC_SYSCTL
154 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
155                   void __user *buffer, size_t *lenp, loff_t *ppos);
156 static int proc_taint(struct ctl_table *table, int write, struct file *filp,
157                                void __user *buffer, size_t *lenp, loff_t *ppos);
158 #endif
159
160 static struct ctl_table root_table[];
161 static struct ctl_table_root sysctl_table_root;
162 static struct ctl_table_header root_table_header = {
163         .count = 1,
164         .ctl_table = root_table,
165         .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.default_set.list),
166         .root = &sysctl_table_root,
167         .set = &sysctl_table_root.default_set,
168 };
169 static struct ctl_table_root sysctl_table_root = {
170         .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list),
171         .default_set.list = LIST_HEAD_INIT(root_table_header.ctl_entry),
172 };
173
174 static struct ctl_table kern_table[];
175 static struct ctl_table vm_table[];
176 static struct ctl_table fs_table[];
177 static struct ctl_table debug_table[];
178 static struct ctl_table dev_table[];
179 extern struct ctl_table random_table[];
180 #ifdef CONFIG_INOTIFY_USER
181 extern struct ctl_table inotify_table[];
182 #endif
183 #ifdef CONFIG_EPOLL
184 extern struct ctl_table epoll_table[];
185 #endif
186
187 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
188 int sysctl_legacy_va_layout;
189 #endif
190
191 extern int prove_locking;
192 extern int lock_stat;
193
194 /* The default sysctl tables: */
195
196 static struct ctl_table root_table[] = {
197         {
198                 .ctl_name       = CTL_KERN,
199                 .procname       = "kernel",
200                 .mode           = 0555,
201                 .child          = kern_table,
202         },
203         {
204                 .ctl_name       = CTL_VM,
205                 .procname       = "vm",
206                 .mode           = 0555,
207                 .child          = vm_table,
208         },
209         {
210                 .ctl_name       = CTL_FS,
211                 .procname       = "fs",
212                 .mode           = 0555,
213                 .child          = fs_table,
214         },
215         {
216                 .ctl_name       = CTL_DEBUG,
217                 .procname       = "debug",
218                 .mode           = 0555,
219                 .child          = debug_table,
220         },
221         {
222                 .ctl_name       = CTL_DEV,
223                 .procname       = "dev",
224                 .mode           = 0555,
225                 .child          = dev_table,
226         },
227 /*
228  * NOTE: do not add new entries to this table unless you have read
229  * Documentation/sysctl/ctl_unnumbered.txt
230  */
231         { .ctl_name = 0 }
232 };
233
234 #ifdef CONFIG_SCHED_DEBUG
235 static int min_sched_granularity_ns = 100000;           /* 100 usecs */
236 static int max_sched_granularity_ns = NSEC_PER_SEC;     /* 1 second */
237 static int min_wakeup_granularity_ns;                   /* 0 usecs */
238 static int max_wakeup_granularity_ns = NSEC_PER_SEC;    /* 1 second */
239 #endif
240
241 static struct ctl_table kern_table[] = {
242 #ifdef CONFIG_SCHED_DEBUG
243         {
244                 .ctl_name       = CTL_UNNUMBERED,
245                 .procname       = "sched_min_granularity_ns",
246                 .data           = &sysctl_sched_min_granularity,
247                 .maxlen         = sizeof(unsigned int),
248                 .mode           = 0644,
249                 .proc_handler   = &sched_nr_latency_handler,
250                 .strategy       = &sysctl_intvec,
251                 .extra1         = &min_sched_granularity_ns,
252                 .extra2         = &max_sched_granularity_ns,
253         },
254         {
255                 .ctl_name       = CTL_UNNUMBERED,
256                 .procname       = "sched_latency_ns",
257                 .data           = &sysctl_sched_latency,
258                 .maxlen         = sizeof(unsigned int),
259                 .mode           = 0644,
260                 .proc_handler   = &sched_nr_latency_handler,
261                 .strategy       = &sysctl_intvec,
262                 .extra1         = &min_sched_granularity_ns,
263                 .extra2         = &max_sched_granularity_ns,
264         },
265         {
266                 .ctl_name       = CTL_UNNUMBERED,
267                 .procname       = "sched_wakeup_granularity_ns",
268                 .data           = &sysctl_sched_wakeup_granularity,
269                 .maxlen         = sizeof(unsigned int),
270                 .mode           = 0644,
271                 .proc_handler   = &proc_dointvec_minmax,
272                 .strategy       = &sysctl_intvec,
273                 .extra1         = &min_wakeup_granularity_ns,
274                 .extra2         = &max_wakeup_granularity_ns,
275         },
276         {
277                 .ctl_name       = CTL_UNNUMBERED,
278                 .procname       = "sched_shares_ratelimit",
279                 .data           = &sysctl_sched_shares_ratelimit,
280                 .maxlen         = sizeof(unsigned int),
281                 .mode           = 0644,
282                 .proc_handler   = &proc_dointvec,
283         },
284         {
285                 .ctl_name       = CTL_UNNUMBERED,
286                 .procname       = "sched_shares_thresh",
287                 .data           = &sysctl_sched_shares_thresh,
288                 .maxlen         = sizeof(unsigned int),
289                 .mode           = 0644,
290                 .proc_handler   = &proc_dointvec_minmax,
291                 .strategy       = &sysctl_intvec,
292                 .extra1         = &zero,
293         },
294         {
295                 .ctl_name       = CTL_UNNUMBERED,
296                 .procname       = "sched_child_runs_first",
297                 .data           = &sysctl_sched_child_runs_first,
298                 .maxlen         = sizeof(unsigned int),
299                 .mode           = 0644,
300                 .proc_handler   = &proc_dointvec,
301         },
302         {
303                 .ctl_name       = CTL_UNNUMBERED,
304                 .procname       = "sched_features",
305                 .data           = &sysctl_sched_features,
306                 .maxlen         = sizeof(unsigned int),
307                 .mode           = 0644,
308                 .proc_handler   = &proc_dointvec,
309         },
310         {
311                 .ctl_name       = CTL_UNNUMBERED,
312                 .procname       = "sched_migration_cost",
313                 .data           = &sysctl_sched_migration_cost,
314                 .maxlen         = sizeof(unsigned int),
315                 .mode           = 0644,
316                 .proc_handler   = &proc_dointvec,
317         },
318         {
319                 .ctl_name       = CTL_UNNUMBERED,
320                 .procname       = "sched_nr_migrate",
321                 .data           = &sysctl_sched_nr_migrate,
322                 .maxlen         = sizeof(unsigned int),
323                 .mode           = 0644,
324                 .proc_handler   = &proc_dointvec,
325         },
326 #endif
327         {
328                 .ctl_name       = CTL_UNNUMBERED,
329                 .procname       = "sched_rt_period_us",
330                 .data           = &sysctl_sched_rt_period,
331                 .maxlen         = sizeof(unsigned int),
332                 .mode           = 0644,
333                 .proc_handler   = &sched_rt_handler,
334         },
335         {
336                 .ctl_name       = CTL_UNNUMBERED,
337                 .procname       = "sched_rt_runtime_us",
338                 .data           = &sysctl_sched_rt_runtime,
339                 .maxlen         = sizeof(int),
340                 .mode           = 0644,
341                 .proc_handler   = &sched_rt_handler,
342         },
343         {
344                 .ctl_name       = CTL_UNNUMBERED,
345                 .procname       = "sched_compat_yield",
346                 .data           = &sysctl_sched_compat_yield,
347                 .maxlen         = sizeof(unsigned int),
348                 .mode           = 0644,
349                 .proc_handler   = &proc_dointvec,
350         },
351 #ifdef CONFIG_PROVE_LOCKING
352         {
353                 .ctl_name       = CTL_UNNUMBERED,
354                 .procname       = "prove_locking",
355                 .data           = &prove_locking,
356                 .maxlen         = sizeof(int),
357                 .mode           = 0644,
358                 .proc_handler   = &proc_dointvec,
359         },
360 #endif
361 #ifdef CONFIG_LOCK_STAT
362         {
363                 .ctl_name       = CTL_UNNUMBERED,
364                 .procname       = "lock_stat",
365                 .data           = &lock_stat,
366                 .maxlen         = sizeof(int),
367                 .mode           = 0644,
368                 .proc_handler   = &proc_dointvec,
369         },
370 #endif
371         {
372                 .ctl_name       = KERN_PANIC,
373                 .procname       = "panic",
374                 .data           = &panic_timeout,
375                 .maxlen         = sizeof(int),
376                 .mode           = 0644,
377                 .proc_handler   = &proc_dointvec,
378         },
379         {
380                 .ctl_name       = KERN_CORE_USES_PID,
381                 .procname       = "core_uses_pid",
382                 .data           = &core_uses_pid,
383                 .maxlen         = sizeof(int),
384                 .mode           = 0644,
385                 .proc_handler   = &proc_dointvec,
386         },
387         {
388                 .ctl_name       = KERN_CORE_PATTERN,
389                 .procname       = "core_pattern",
390                 .data           = core_pattern,
391                 .maxlen         = CORENAME_MAX_SIZE,
392                 .mode           = 0644,
393                 .proc_handler   = &proc_dostring,
394                 .strategy       = &sysctl_string,
395         },
396 #ifdef CONFIG_PROC_SYSCTL
397         {
398                 .procname       = "tainted",
399                 .maxlen         = sizeof(long),
400                 .mode           = 0644,
401                 .proc_handler   = &proc_taint,
402         },
403 #endif
404 #ifdef CONFIG_LATENCYTOP
405         {
406                 .procname       = "latencytop",
407                 .data           = &latencytop_enabled,
408                 .maxlen         = sizeof(int),
409                 .mode           = 0644,
410                 .proc_handler   = &proc_dointvec,
411         },
412 #endif
413 #ifdef CONFIG_BLK_DEV_INITRD
414         {
415                 .ctl_name       = KERN_REALROOTDEV,
416                 .procname       = "real-root-dev",
417                 .data           = &real_root_dev,
418                 .maxlen         = sizeof(int),
419                 .mode           = 0644,
420                 .proc_handler   = &proc_dointvec,
421         },
422 #endif
423         {
424                 .ctl_name       = CTL_UNNUMBERED,
425                 .procname       = "print-fatal-signals",
426                 .data           = &print_fatal_signals,
427                 .maxlen         = sizeof(int),
428                 .mode           = 0644,
429                 .proc_handler   = &proc_dointvec,
430         },
431 #ifdef CONFIG_SPARC
432         {
433                 .ctl_name       = KERN_SPARC_REBOOT,
434                 .procname       = "reboot-cmd",
435                 .data           = reboot_command,
436                 .maxlen         = 256,
437                 .mode           = 0644,
438                 .proc_handler   = &proc_dostring,
439                 .strategy       = &sysctl_string,
440         },
441         {
442                 .ctl_name       = KERN_SPARC_STOP_A,
443                 .procname       = "stop-a",
444                 .data           = &stop_a_enabled,
445                 .maxlen         = sizeof (int),
446                 .mode           = 0644,
447                 .proc_handler   = &proc_dointvec,
448         },
449         {
450                 .ctl_name       = KERN_SPARC_SCONS_PWROFF,
451                 .procname       = "scons-poweroff",
452                 .data           = &scons_pwroff,
453                 .maxlen         = sizeof (int),
454                 .mode           = 0644,
455                 .proc_handler   = &proc_dointvec,
456         },
457 #endif
458 #ifdef CONFIG_SPARC64
459         {
460                 .ctl_name       = CTL_UNNUMBERED,
461                 .procname       = "tsb-ratio",
462                 .data           = &sysctl_tsb_ratio,
463                 .maxlen         = sizeof (int),
464                 .mode           = 0644,
465                 .proc_handler   = &proc_dointvec,
466         },
467 #endif
468 #ifdef __hppa__
469         {
470                 .ctl_name       = KERN_HPPA_PWRSW,
471                 .procname       = "soft-power",
472                 .data           = &pwrsw_enabled,
473                 .maxlen         = sizeof (int),
474                 .mode           = 0644,
475                 .proc_handler   = &proc_dointvec,
476         },
477         {
478                 .ctl_name       = KERN_HPPA_UNALIGNED,
479                 .procname       = "unaligned-trap",
480                 .data           = &unaligned_enabled,
481                 .maxlen         = sizeof (int),
482                 .mode           = 0644,
483                 .proc_handler   = &proc_dointvec,
484         },
485 #endif
486         {
487                 .ctl_name       = KERN_CTLALTDEL,
488                 .procname       = "ctrl-alt-del",
489                 .data           = &C_A_D,
490                 .maxlen         = sizeof(int),
491                 .mode           = 0644,
492                 .proc_handler   = &proc_dointvec,
493         },
494 #ifdef CONFIG_FUNCTION_TRACER
495         {
496                 .ctl_name       = CTL_UNNUMBERED,
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                 .ctl_name       = CTL_UNNUMBERED,
507                 .procname       = "stack_tracer_enabled",
508                 .data           = &stack_tracer_enabled,
509                 .maxlen         = sizeof(int),
510                 .mode           = 0644,
511                 .proc_handler   = &stack_trace_sysctl,
512         },
513 #endif
514 #ifdef CONFIG_TRACING
515         {
516                 .ctl_name       = CTL_UNNUMBERED,
517                 .procname       = "ftrace_dump_on_oops",
518                 .data           = &ftrace_dump_on_oops,
519                 .maxlen         = sizeof(int),
520                 .mode           = 0644,
521                 .proc_handler   = &proc_dointvec,
522         },
523 #endif
524 #ifdef CONFIG_MODULES
525         {
526                 .ctl_name       = KERN_MODPROBE,
527                 .procname       = "modprobe",
528                 .data           = &modprobe_path,
529                 .maxlen         = KMOD_PATH_LEN,
530                 .mode           = 0644,
531                 .proc_handler   = &proc_dostring,
532                 .strategy       = &sysctl_string,
533         },
534 #endif
535 #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
536         {
537                 .ctl_name       = KERN_HOTPLUG,
538                 .procname       = "hotplug",
539                 .data           = &uevent_helper,
540                 .maxlen         = UEVENT_HELPER_PATH_LEN,
541                 .mode           = 0644,
542                 .proc_handler   = &proc_dostring,
543                 .strategy       = &sysctl_string,
544         },
545 #endif
546 #ifdef CONFIG_CHR_DEV_SG
547         {
548                 .ctl_name       = KERN_SG_BIG_BUFF,
549                 .procname       = "sg-big-buff",
550                 .data           = &sg_big_buff,
551                 .maxlen         = sizeof (int),
552                 .mode           = 0444,
553                 .proc_handler   = &proc_dointvec,
554         },
555 #endif
556 #ifdef CONFIG_BSD_PROCESS_ACCT
557         {
558                 .ctl_name       = KERN_ACCT,
559                 .procname       = "acct",
560                 .data           = &acct_parm,
561                 .maxlen         = 3*sizeof(int),
562                 .mode           = 0644,
563                 .proc_handler   = &proc_dointvec,
564         },
565 #endif
566 #ifdef CONFIG_MAGIC_SYSRQ
567         {
568                 .ctl_name       = KERN_SYSRQ,
569                 .procname       = "sysrq",
570                 .data           = &__sysrq_enabled,
571                 .maxlen         = sizeof (int),
572                 .mode           = 0644,
573                 .proc_handler   = &proc_dointvec,
574         },
575 #endif
576 #ifdef CONFIG_PROC_SYSCTL
577         {
578                 .procname       = "cad_pid",
579                 .data           = NULL,
580                 .maxlen         = sizeof (int),
581                 .mode           = 0600,
582                 .proc_handler   = &proc_do_cad_pid,
583         },
584 #endif
585         {
586                 .ctl_name       = KERN_MAX_THREADS,
587                 .procname       = "threads-max",
588                 .data           = &max_threads,
589                 .maxlen         = sizeof(int),
590                 .mode           = 0644,
591                 .proc_handler   = &proc_dointvec,
592         },
593         {
594                 .ctl_name       = KERN_RANDOM,
595                 .procname       = "random",
596                 .mode           = 0555,
597                 .child          = random_table,
598         },
599         {
600                 .ctl_name       = KERN_OVERFLOWUID,
601                 .procname       = "overflowuid",
602                 .data           = &overflowuid,
603                 .maxlen         = sizeof(int),
604                 .mode           = 0644,
605                 .proc_handler   = &proc_dointvec_minmax,
606                 .strategy       = &sysctl_intvec,
607                 .extra1         = &minolduid,
608                 .extra2         = &maxolduid,
609         },
610         {
611                 .ctl_name       = KERN_OVERFLOWGID,
612                 .procname       = "overflowgid",
613                 .data           = &overflowgid,
614                 .maxlen         = sizeof(int),
615                 .mode           = 0644,
616                 .proc_handler   = &proc_dointvec_minmax,
617                 .strategy       = &sysctl_intvec,
618                 .extra1         = &minolduid,
619                 .extra2         = &maxolduid,
620         },
621 #ifdef CONFIG_S390
622 #ifdef CONFIG_MATHEMU
623         {
624                 .ctl_name       = KERN_IEEE_EMULATION_WARNINGS,
625                 .procname       = "ieee_emulation_warnings",
626                 .data           = &sysctl_ieee_emulation_warnings,
627                 .maxlen         = sizeof(int),
628                 .mode           = 0644,
629                 .proc_handler   = &proc_dointvec,
630         },
631 #endif
632         {
633                 .ctl_name       = KERN_S390_USER_DEBUG_LOGGING,
634                 .procname       = "userprocess_debug",
635                 .data           = &sysctl_userprocess_debug,
636                 .maxlen         = sizeof(int),
637                 .mode           = 0644,
638                 .proc_handler   = &proc_dointvec,
639         },
640 #endif
641         {
642                 .ctl_name       = KERN_PIDMAX,
643                 .procname       = "pid_max",
644                 .data           = &pid_max,
645                 .maxlen         = sizeof (int),
646                 .mode           = 0644,
647                 .proc_handler   = &proc_dointvec_minmax,
648                 .strategy       = sysctl_intvec,
649                 .extra1         = &pid_max_min,
650                 .extra2         = &pid_max_max,
651         },
652         {
653                 .ctl_name       = KERN_PANIC_ON_OOPS,
654                 .procname       = "panic_on_oops",
655                 .data           = &panic_on_oops,
656                 .maxlen         = sizeof(int),
657                 .mode           = 0644,
658                 .proc_handler   = &proc_dointvec,
659         },
660 #if defined CONFIG_PRINTK
661         {
662                 .ctl_name       = KERN_PRINTK,
663                 .procname       = "printk",
664                 .data           = &console_loglevel,
665                 .maxlen         = 4*sizeof(int),
666                 .mode           = 0644,
667                 .proc_handler   = &proc_dointvec,
668         },
669         {
670                 .ctl_name       = KERN_PRINTK_RATELIMIT,
671                 .procname       = "printk_ratelimit",
672                 .data           = &printk_ratelimit_state.interval,
673                 .maxlen         = sizeof(int),
674                 .mode           = 0644,
675                 .proc_handler   = &proc_dointvec_jiffies,
676                 .strategy       = &sysctl_jiffies,
677         },
678         {
679                 .ctl_name       = KERN_PRINTK_RATELIMIT_BURST,
680                 .procname       = "printk_ratelimit_burst",
681                 .data           = &printk_ratelimit_state.burst,
682                 .maxlen         = sizeof(int),
683                 .mode           = 0644,
684                 .proc_handler   = &proc_dointvec,
685         },
686 #endif
687         {
688                 .ctl_name       = KERN_NGROUPS_MAX,
689                 .procname       = "ngroups_max",
690                 .data           = &ngroups_max,
691                 .maxlen         = sizeof (int),
692                 .mode           = 0444,
693                 .proc_handler   = &proc_dointvec,
694         },
695 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
696         {
697                 .ctl_name       = KERN_UNKNOWN_NMI_PANIC,
698                 .procname       = "unknown_nmi_panic",
699                 .data           = &unknown_nmi_panic,
700                 .maxlen         = sizeof (int),
701                 .mode           = 0644,
702                 .proc_handler   = &proc_dointvec,
703         },
704         {
705                 .procname       = "nmi_watchdog",
706                 .data           = &nmi_watchdog_enabled,
707                 .maxlen         = sizeof (int),
708                 .mode           = 0644,
709                 .proc_handler   = &proc_nmi_enabled,
710         },
711 #endif
712 #if defined(CONFIG_X86)
713         {
714                 .ctl_name       = KERN_PANIC_ON_NMI,
715                 .procname       = "panic_on_unrecovered_nmi",
716                 .data           = &panic_on_unrecovered_nmi,
717                 .maxlen         = sizeof(int),
718                 .mode           = 0644,
719                 .proc_handler   = &proc_dointvec,
720         },
721         {
722                 .ctl_name       = KERN_BOOTLOADER_TYPE,
723                 .procname       = "bootloader_type",
724                 .data           = &bootloader_type,
725                 .maxlen         = sizeof (int),
726                 .mode           = 0444,
727                 .proc_handler   = &proc_dointvec,
728         },
729         {
730                 .ctl_name       = CTL_UNNUMBERED,
731                 .procname       = "kstack_depth_to_print",
732                 .data           = &kstack_depth_to_print,
733                 .maxlen         = sizeof(int),
734                 .mode           = 0644,
735                 .proc_handler   = &proc_dointvec,
736         },
737         {
738                 .ctl_name       = CTL_UNNUMBERED,
739                 .procname       = "io_delay_type",
740                 .data           = &io_delay_type,
741                 .maxlen         = sizeof(int),
742                 .mode           = 0644,
743                 .proc_handler   = &proc_dointvec,
744         },
745 #endif
746 #if defined(CONFIG_MMU)
747         {
748                 .ctl_name       = KERN_RANDOMIZE,
749                 .procname       = "randomize_va_space",
750                 .data           = &randomize_va_space,
751                 .maxlen         = sizeof(int),
752                 .mode           = 0644,
753                 .proc_handler   = &proc_dointvec,
754         },
755 #endif
756 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
757         {
758                 .ctl_name       = KERN_SPIN_RETRY,
759                 .procname       = "spin_retry",
760                 .data           = &spin_retry,
761                 .maxlen         = sizeof (int),
762                 .mode           = 0644,
763                 .proc_handler   = &proc_dointvec,
764         },
765 #endif
766 #if     defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
767         {
768                 .procname       = "acpi_video_flags",
769                 .data           = &acpi_realmode_flags,
770                 .maxlen         = sizeof (unsigned long),
771                 .mode           = 0644,
772                 .proc_handler   = &proc_doulongvec_minmax,
773         },
774 #endif
775 #ifdef CONFIG_IA64
776         {
777                 .ctl_name       = KERN_IA64_UNALIGNED,
778                 .procname       = "ignore-unaligned-usertrap",
779                 .data           = &no_unaligned_warning,
780                 .maxlen         = sizeof (int),
781                 .mode           = 0644,
782                 .proc_handler   = &proc_dointvec,
783         },
784         {
785                 .ctl_name       = CTL_UNNUMBERED,
786                 .procname       = "unaligned-dump-stack",
787                 .data           = &unaligned_dump_stack,
788                 .maxlen         = sizeof (int),
789                 .mode           = 0644,
790                 .proc_handler   = &proc_dointvec,
791         },
792 #endif
793 #ifdef CONFIG_DETECT_SOFTLOCKUP
794         {
795                 .ctl_name       = CTL_UNNUMBERED,
796                 .procname       = "softlockup_panic",
797                 .data           = &softlockup_panic,
798                 .maxlen         = sizeof(int),
799                 .mode           = 0644,
800                 .proc_handler   = &proc_dointvec_minmax,
801                 .strategy       = &sysctl_intvec,
802                 .extra1         = &zero,
803                 .extra2         = &one,
804         },
805         {
806                 .ctl_name       = CTL_UNNUMBERED,
807                 .procname       = "softlockup_thresh",
808                 .data           = &softlockup_thresh,
809                 .maxlen         = sizeof(int),
810                 .mode           = 0644,
811                 .proc_handler   = &proc_dosoftlockup_thresh,
812                 .strategy       = &sysctl_intvec,
813                 .extra1         = &neg_one,
814                 .extra2         = &sixty,
815         },
816         {
817                 .ctl_name       = CTL_UNNUMBERED,
818                 .procname       = "hung_task_check_count",
819                 .data           = &sysctl_hung_task_check_count,
820                 .maxlen         = sizeof(unsigned long),
821                 .mode           = 0644,
822                 .proc_handler   = &proc_doulongvec_minmax,
823                 .strategy       = &sysctl_intvec,
824         },
825         {
826                 .ctl_name       = CTL_UNNUMBERED,
827                 .procname       = "hung_task_timeout_secs",
828                 .data           = &sysctl_hung_task_timeout_secs,
829                 .maxlen         = sizeof(unsigned long),
830                 .mode           = 0644,
831                 .proc_handler   = &proc_doulongvec_minmax,
832                 .strategy       = &sysctl_intvec,
833         },
834         {
835                 .ctl_name       = CTL_UNNUMBERED,
836                 .procname       = "hung_task_warnings",
837                 .data           = &sysctl_hung_task_warnings,
838                 .maxlen         = sizeof(unsigned long),
839                 .mode           = 0644,
840                 .proc_handler   = &proc_doulongvec_minmax,
841                 .strategy       = &sysctl_intvec,
842         },
843 #endif
844 #ifdef CONFIG_COMPAT
845         {
846                 .ctl_name       = KERN_COMPAT_LOG,
847                 .procname       = "compat-log",
848                 .data           = &compat_log,
849                 .maxlen         = sizeof (int),
850                 .mode           = 0644,
851                 .proc_handler   = &proc_dointvec,
852         },
853 #endif
854 #ifdef CONFIG_RT_MUTEXES
855         {
856                 .ctl_name       = KERN_MAX_LOCK_DEPTH,
857                 .procname       = "max_lock_depth",
858                 .data           = &max_lock_depth,
859                 .maxlen         = sizeof(int),
860                 .mode           = 0644,
861                 .proc_handler   = &proc_dointvec,
862         },
863 #endif
864         {
865                 .ctl_name       = CTL_UNNUMBERED,
866                 .procname       = "poweroff_cmd",
867                 .data           = &poweroff_cmd,
868                 .maxlen         = POWEROFF_CMD_PATH_LEN,
869                 .mode           = 0644,
870                 .proc_handler   = &proc_dostring,
871                 .strategy       = &sysctl_string,
872         },
873 #ifdef CONFIG_KEYS
874         {
875                 .ctl_name       = CTL_UNNUMBERED,
876                 .procname       = "keys",
877                 .mode           = 0555,
878                 .child          = key_sysctls,
879         },
880 #endif
881 #ifdef CONFIG_RCU_TORTURE_TEST
882         {
883                 .ctl_name       = CTL_UNNUMBERED,
884                 .procname       = "rcutorture_runnable",
885                 .data           = &rcutorture_runnable,
886                 .maxlen         = sizeof(int),
887                 .mode           = 0644,
888                 .proc_handler   = &proc_dointvec,
889         },
890 #endif
891 #ifdef CONFIG_UNEVICTABLE_LRU
892         {
893                 .ctl_name       = CTL_UNNUMBERED,
894                 .procname       = "scan_unevictable_pages",
895                 .data           = &scan_unevictable_pages,
896                 .maxlen         = sizeof(scan_unevictable_pages),
897                 .mode           = 0644,
898                 .proc_handler   = &scan_unevictable_handler,
899         },
900 #endif
901 #ifdef CONFIG_SLOW_WORK
902         {
903                 .ctl_name       = CTL_UNNUMBERED,
904                 .procname       = "slow-work",
905                 .mode           = 0555,
906                 .child          = slow_work_sysctls,
907         },
908 #endif
909 /*
910  * NOTE: do not add new entries to this table unless you have read
911  * Documentation/sysctl/ctl_unnumbered.txt
912  */
913         { .ctl_name = 0 }
914 };
915
916 static struct ctl_table vm_table[] = {
917         {
918                 .ctl_name       = VM_OVERCOMMIT_MEMORY,
919                 .procname       = "overcommit_memory",
920                 .data           = &sysctl_overcommit_memory,
921                 .maxlen         = sizeof(sysctl_overcommit_memory),
922                 .mode           = 0644,
923                 .proc_handler   = &proc_dointvec,
924         },
925         {
926                 .ctl_name       = VM_PANIC_ON_OOM,
927                 .procname       = "panic_on_oom",
928                 .data           = &sysctl_panic_on_oom,
929                 .maxlen         = sizeof(sysctl_panic_on_oom),
930                 .mode           = 0644,
931                 .proc_handler   = &proc_dointvec,
932         },
933         {
934                 .ctl_name       = CTL_UNNUMBERED,
935                 .procname       = "oom_kill_allocating_task",
936                 .data           = &sysctl_oom_kill_allocating_task,
937                 .maxlen         = sizeof(sysctl_oom_kill_allocating_task),
938                 .mode           = 0644,
939                 .proc_handler   = &proc_dointvec,
940         },
941         {
942                 .ctl_name       = CTL_UNNUMBERED,
943                 .procname       = "oom_dump_tasks",
944                 .data           = &sysctl_oom_dump_tasks,
945                 .maxlen         = sizeof(sysctl_oom_dump_tasks),
946                 .mode           = 0644,
947                 .proc_handler   = &proc_dointvec,
948         },
949         {
950                 .ctl_name       = VM_OVERCOMMIT_RATIO,
951                 .procname       = "overcommit_ratio",
952                 .data           = &sysctl_overcommit_ratio,
953                 .maxlen         = sizeof(sysctl_overcommit_ratio),
954                 .mode           = 0644,
955                 .proc_handler   = &proc_dointvec,
956         },
957         {
958                 .ctl_name       = VM_PAGE_CLUSTER,
959                 .procname       = "page-cluster", 
960                 .data           = &page_cluster,
961                 .maxlen         = sizeof(int),
962                 .mode           = 0644,
963                 .proc_handler   = &proc_dointvec,
964         },
965         {
966                 .ctl_name       = VM_DIRTY_BACKGROUND,
967                 .procname       = "dirty_background_ratio",
968                 .data           = &dirty_background_ratio,
969                 .maxlen         = sizeof(dirty_background_ratio),
970                 .mode           = 0644,
971                 .proc_handler   = &dirty_background_ratio_handler,
972                 .strategy       = &sysctl_intvec,
973                 .extra1         = &zero,
974                 .extra2         = &one_hundred,
975         },
976         {
977                 .ctl_name       = CTL_UNNUMBERED,
978                 .procname       = "dirty_background_bytes",
979                 .data           = &dirty_background_bytes,
980                 .maxlen         = sizeof(dirty_background_bytes),
981                 .mode           = 0644,
982                 .proc_handler   = &dirty_background_bytes_handler,
983                 .strategy       = &sysctl_intvec,
984                 .extra1         = &one_ul,
985         },
986         {
987                 .ctl_name       = VM_DIRTY_RATIO,
988                 .procname       = "dirty_ratio",
989                 .data           = &vm_dirty_ratio,
990                 .maxlen         = sizeof(vm_dirty_ratio),
991                 .mode           = 0644,
992                 .proc_handler   = &dirty_ratio_handler,
993                 .strategy       = &sysctl_intvec,
994                 .extra1         = &zero,
995                 .extra2         = &one_hundred,
996         },
997         {
998                 .ctl_name       = CTL_UNNUMBERED,
999                 .procname       = "dirty_bytes",
1000                 .data           = &vm_dirty_bytes,
1001                 .maxlen         = sizeof(vm_dirty_bytes),
1002                 .mode           = 0644,
1003                 .proc_handler   = &dirty_bytes_handler,
1004                 .strategy       = &sysctl_intvec,
1005                 .extra1         = &one_ul,
1006         },
1007         {
1008                 .procname       = "dirty_writeback_centisecs",
1009                 .data           = &dirty_writeback_interval,
1010                 .maxlen         = sizeof(dirty_writeback_interval),
1011                 .mode           = 0644,
1012                 .proc_handler   = &dirty_writeback_centisecs_handler,
1013         },
1014         {
1015                 .procname       = "dirty_expire_centisecs",
1016                 .data           = &dirty_expire_interval,
1017                 .maxlen         = sizeof(dirty_expire_interval),
1018                 .mode           = 0644,
1019                 .proc_handler   = &proc_dointvec,
1020         },
1021         {
1022                 .ctl_name       = VM_NR_PDFLUSH_THREADS,
1023                 .procname       = "nr_pdflush_threads",
1024                 .data           = &nr_pdflush_threads,
1025                 .maxlen         = sizeof nr_pdflush_threads,
1026                 .mode           = 0444 /* read-only*/,
1027                 .proc_handler   = &proc_dointvec,
1028         },
1029         {
1030                 .ctl_name       = VM_SWAPPINESS,
1031                 .procname       = "swappiness",
1032                 .data           = &vm_swappiness,
1033                 .maxlen         = sizeof(vm_swappiness),
1034                 .mode           = 0644,
1035                 .proc_handler   = &proc_dointvec_minmax,
1036                 .strategy       = &sysctl_intvec,
1037                 .extra1         = &zero,
1038                 .extra2         = &one_hundred,
1039         },
1040 #ifdef CONFIG_HUGETLB_PAGE
1041          {
1042                 .procname       = "nr_hugepages",
1043                 .data           = NULL,
1044                 .maxlen         = sizeof(unsigned long),
1045                 .mode           = 0644,
1046                 .proc_handler   = &hugetlb_sysctl_handler,
1047                 .extra1         = (void *)&hugetlb_zero,
1048                 .extra2         = (void *)&hugetlb_infinity,
1049          },
1050          {
1051                 .ctl_name       = VM_HUGETLB_GROUP,
1052                 .procname       = "hugetlb_shm_group",
1053                 .data           = &sysctl_hugetlb_shm_group,
1054                 .maxlen         = sizeof(gid_t),
1055                 .mode           = 0644,
1056                 .proc_handler   = &proc_dointvec,
1057          },
1058          {
1059                 .ctl_name       = CTL_UNNUMBERED,
1060                 .procname       = "hugepages_treat_as_movable",
1061                 .data           = &hugepages_treat_as_movable,
1062                 .maxlen         = sizeof(int),
1063                 .mode           = 0644,
1064                 .proc_handler   = &hugetlb_treat_movable_handler,
1065         },
1066         {
1067                 .ctl_name       = CTL_UNNUMBERED,
1068                 .procname       = "nr_overcommit_hugepages",
1069                 .data           = NULL,
1070                 .maxlen         = sizeof(unsigned long),
1071                 .mode           = 0644,
1072                 .proc_handler   = &hugetlb_overcommit_handler,
1073                 .extra1         = (void *)&hugetlb_zero,
1074                 .extra2         = (void *)&hugetlb_infinity,
1075         },
1076 #endif
1077         {
1078                 .ctl_name       = VM_LOWMEM_RESERVE_RATIO,
1079                 .procname       = "lowmem_reserve_ratio",
1080                 .data           = &sysctl_lowmem_reserve_ratio,
1081                 .maxlen         = sizeof(sysctl_lowmem_reserve_ratio),
1082                 .mode           = 0644,
1083                 .proc_handler   = &lowmem_reserve_ratio_sysctl_handler,
1084                 .strategy       = &sysctl_intvec,
1085         },
1086         {
1087                 .ctl_name       = VM_DROP_PAGECACHE,
1088                 .procname       = "drop_caches",
1089                 .data           = &sysctl_drop_caches,
1090                 .maxlen         = sizeof(int),
1091                 .mode           = 0644,
1092                 .proc_handler   = drop_caches_sysctl_handler,
1093                 .strategy       = &sysctl_intvec,
1094         },
1095         {
1096                 .ctl_name       = VM_MIN_FREE_KBYTES,
1097                 .procname       = "min_free_kbytes",
1098                 .data           = &min_free_kbytes,
1099                 .maxlen         = sizeof(min_free_kbytes),
1100                 .mode           = 0644,
1101                 .proc_handler   = &min_free_kbytes_sysctl_handler,
1102                 .strategy       = &sysctl_intvec,
1103                 .extra1         = &zero,
1104         },
1105         {
1106                 .ctl_name       = VM_PERCPU_PAGELIST_FRACTION,
1107                 .procname       = "percpu_pagelist_fraction",
1108                 .data           = &percpu_pagelist_fraction,
1109                 .maxlen         = sizeof(percpu_pagelist_fraction),
1110                 .mode           = 0644,
1111                 .proc_handler   = &percpu_pagelist_fraction_sysctl_handler,
1112                 .strategy       = &sysctl_intvec,
1113                 .extra1         = &min_percpu_pagelist_fract,
1114         },
1115 #ifdef CONFIG_MMU
1116         {
1117                 .ctl_name       = VM_MAX_MAP_COUNT,
1118                 .procname       = "max_map_count",
1119                 .data           = &sysctl_max_map_count,
1120                 .maxlen         = sizeof(sysctl_max_map_count),
1121                 .mode           = 0644,
1122                 .proc_handler   = &proc_dointvec
1123         },
1124 #else
1125         {
1126                 .ctl_name       = CTL_UNNUMBERED,
1127                 .procname       = "nr_trim_pages",
1128                 .data           = &sysctl_nr_trim_pages,
1129                 .maxlen         = sizeof(sysctl_nr_trim_pages),
1130                 .mode           = 0644,
1131                 .proc_handler   = &proc_dointvec_minmax,
1132                 .strategy       = &sysctl_intvec,
1133                 .extra1         = &zero,
1134         },
1135 #endif
1136         {
1137                 .ctl_name       = VM_LAPTOP_MODE,
1138                 .procname       = "laptop_mode",
1139                 .data           = &laptop_mode,
1140                 .maxlen         = sizeof(laptop_mode),
1141                 .mode           = 0644,
1142                 .proc_handler   = &proc_dointvec_jiffies,
1143                 .strategy       = &sysctl_jiffies,
1144         },
1145         {
1146                 .ctl_name       = VM_BLOCK_DUMP,
1147                 .procname       = "block_dump",
1148                 .data           = &block_dump,
1149                 .maxlen         = sizeof(block_dump),
1150                 .mode           = 0644,
1151                 .proc_handler   = &proc_dointvec,
1152                 .strategy       = &sysctl_intvec,
1153                 .extra1         = &zero,
1154         },
1155         {
1156                 .ctl_name       = VM_VFS_CACHE_PRESSURE,
1157                 .procname       = "vfs_cache_pressure",
1158                 .data           = &sysctl_vfs_cache_pressure,
1159                 .maxlen         = sizeof(sysctl_vfs_cache_pressure),
1160                 .mode           = 0644,
1161                 .proc_handler   = &proc_dointvec,
1162                 .strategy       = &sysctl_intvec,
1163                 .extra1         = &zero,
1164         },
1165 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1166         {
1167                 .ctl_name       = VM_LEGACY_VA_LAYOUT,
1168                 .procname       = "legacy_va_layout",
1169                 .data           = &sysctl_legacy_va_layout,
1170                 .maxlen         = sizeof(sysctl_legacy_va_layout),
1171                 .mode           = 0644,
1172                 .proc_handler   = &proc_dointvec,
1173                 .strategy       = &sysctl_intvec,
1174                 .extra1         = &zero,
1175         },
1176 #endif
1177 #ifdef CONFIG_NUMA
1178         {
1179                 .ctl_name       = VM_ZONE_RECLAIM_MODE,
1180                 .procname       = "zone_reclaim_mode",
1181                 .data           = &zone_reclaim_mode,
1182                 .maxlen         = sizeof(zone_reclaim_mode),
1183                 .mode           = 0644,
1184                 .proc_handler   = &proc_dointvec,
1185                 .strategy       = &sysctl_intvec,
1186                 .extra1         = &zero,
1187         },
1188         {
1189                 .ctl_name       = VM_MIN_UNMAPPED,
1190                 .procname       = "min_unmapped_ratio",
1191                 .data           = &sysctl_min_unmapped_ratio,
1192                 .maxlen         = sizeof(sysctl_min_unmapped_ratio),
1193                 .mode           = 0644,
1194                 .proc_handler   = &sysctl_min_unmapped_ratio_sysctl_handler,
1195                 .strategy       = &sysctl_intvec,
1196                 .extra1         = &zero,
1197                 .extra2         = &one_hundred,
1198         },
1199         {
1200                 .ctl_name       = VM_MIN_SLAB,
1201                 .procname       = "min_slab_ratio",
1202                 .data           = &sysctl_min_slab_ratio,
1203                 .maxlen         = sizeof(sysctl_min_slab_ratio),
1204                 .mode           = 0644,
1205                 .proc_handler   = &sysctl_min_slab_ratio_sysctl_handler,
1206                 .strategy       = &sysctl_intvec,
1207                 .extra1         = &zero,
1208                 .extra2         = &one_hundred,
1209         },
1210 #endif
1211 #ifdef CONFIG_SMP
1212         {
1213                 .ctl_name       = CTL_UNNUMBERED,
1214                 .procname       = "stat_interval",
1215                 .data           = &sysctl_stat_interval,
1216                 .maxlen         = sizeof(sysctl_stat_interval),
1217                 .mode           = 0644,
1218                 .proc_handler   = &proc_dointvec_jiffies,
1219                 .strategy       = &sysctl_jiffies,
1220         },
1221 #endif
1222 #ifdef CONFIG_SECURITY
1223         {
1224                 .ctl_name       = CTL_UNNUMBERED,
1225                 .procname       = "mmap_min_addr",
1226                 .data           = &mmap_min_addr,
1227                 .maxlen         = sizeof(unsigned long),
1228                 .mode           = 0644,
1229                 .proc_handler   = &proc_doulongvec_minmax,
1230         },
1231 #endif
1232 #ifdef CONFIG_NUMA
1233         {
1234                 .ctl_name       = CTL_UNNUMBERED,
1235                 .procname       = "numa_zonelist_order",
1236                 .data           = &numa_zonelist_order,
1237                 .maxlen         = NUMA_ZONELIST_ORDER_LEN,
1238                 .mode           = 0644,
1239                 .proc_handler   = &numa_zonelist_order_handler,
1240                 .strategy       = &sysctl_string,
1241         },
1242 #endif
1243 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1244    (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1245         {
1246                 .ctl_name       = VM_VDSO_ENABLED,
1247                 .procname       = "vdso_enabled",
1248                 .data           = &vdso_enabled,
1249                 .maxlen         = sizeof(vdso_enabled),
1250                 .mode           = 0644,
1251                 .proc_handler   = &proc_dointvec,
1252                 .strategy       = &sysctl_intvec,
1253                 .extra1         = &zero,
1254         },
1255 #endif
1256 #ifdef CONFIG_HIGHMEM
1257         {
1258                 .ctl_name       = CTL_UNNUMBERED,
1259                 .procname       = "highmem_is_dirtyable",
1260                 .data           = &vm_highmem_is_dirtyable,
1261                 .maxlen         = sizeof(vm_highmem_is_dirtyable),
1262                 .mode           = 0644,
1263                 .proc_handler   = &proc_dointvec_minmax,
1264                 .strategy       = &sysctl_intvec,
1265                 .extra1         = &zero,
1266                 .extra2         = &one,
1267         },
1268 #endif
1269 /*
1270  * NOTE: do not add new entries to this table unless you have read
1271  * Documentation/sysctl/ctl_unnumbered.txt
1272  */
1273         { .ctl_name = 0 }
1274 };
1275
1276 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1277 static struct ctl_table binfmt_misc_table[] = {
1278         { .ctl_name = 0 }
1279 };
1280 #endif
1281
1282 static struct ctl_table fs_table[] = {
1283         {
1284                 .ctl_name       = FS_NRINODE,
1285                 .procname       = "inode-nr",
1286                 .data           = &inodes_stat,
1287                 .maxlen         = 2*sizeof(int),
1288                 .mode           = 0444,
1289                 .proc_handler   = &proc_dointvec,
1290         },
1291         {
1292                 .ctl_name       = FS_STATINODE,
1293                 .procname       = "inode-state",
1294                 .data           = &inodes_stat,
1295                 .maxlen         = 7*sizeof(int),
1296                 .mode           = 0444,
1297                 .proc_handler   = &proc_dointvec,
1298         },
1299         {
1300                 .procname       = "file-nr",
1301                 .data           = &files_stat,
1302                 .maxlen         = 3*sizeof(int),
1303                 .mode           = 0444,
1304                 .proc_handler   = &proc_nr_files,
1305         },
1306         {
1307                 .ctl_name       = FS_MAXFILE,
1308                 .procname       = "file-max",
1309                 .data           = &files_stat.max_files,
1310                 .maxlen         = sizeof(int),
1311                 .mode           = 0644,
1312                 .proc_handler   = &proc_dointvec,
1313         },
1314         {
1315                 .ctl_name       = CTL_UNNUMBERED,
1316                 .procname       = "nr_open",
1317                 .data           = &sysctl_nr_open,
1318                 .maxlen         = sizeof(int),
1319                 .mode           = 0644,
1320                 .proc_handler   = &proc_dointvec_minmax,
1321                 .extra1         = &sysctl_nr_open_min,
1322                 .extra2         = &sysctl_nr_open_max,
1323         },
1324         {
1325                 .ctl_name       = FS_DENTRY,
1326                 .procname       = "dentry-state",
1327                 .data           = &dentry_stat,
1328                 .maxlen         = 6*sizeof(int),
1329                 .mode           = 0444,
1330                 .proc_handler   = &proc_dointvec,
1331         },
1332         {
1333                 .ctl_name       = FS_OVERFLOWUID,
1334                 .procname       = "overflowuid",
1335                 .data           = &fs_overflowuid,
1336                 .maxlen         = sizeof(int),
1337                 .mode           = 0644,
1338                 .proc_handler   = &proc_dointvec_minmax,
1339                 .strategy       = &sysctl_intvec,
1340                 .extra1         = &minolduid,
1341                 .extra2         = &maxolduid,
1342         },
1343         {
1344                 .ctl_name       = FS_OVERFLOWGID,
1345                 .procname       = "overflowgid",
1346                 .data           = &fs_overflowgid,
1347                 .maxlen         = sizeof(int),
1348                 .mode           = 0644,
1349                 .proc_handler   = &proc_dointvec_minmax,
1350                 .strategy       = &sysctl_intvec,
1351                 .extra1         = &minolduid,
1352                 .extra2         = &maxolduid,
1353         },
1354 #ifdef CONFIG_FILE_LOCKING
1355         {
1356                 .ctl_name       = FS_LEASES,
1357                 .procname       = "leases-enable",
1358                 .data           = &leases_enable,
1359                 .maxlen         = sizeof(int),
1360                 .mode           = 0644,
1361                 .proc_handler   = &proc_dointvec,
1362         },
1363 #endif
1364 #ifdef CONFIG_DNOTIFY
1365         {
1366                 .ctl_name       = FS_DIR_NOTIFY,
1367                 .procname       = "dir-notify-enable",
1368                 .data           = &dir_notify_enable,
1369                 .maxlen         = sizeof(int),
1370                 .mode           = 0644,
1371                 .proc_handler   = &proc_dointvec,
1372         },
1373 #endif
1374 #ifdef CONFIG_MMU
1375 #ifdef CONFIG_FILE_LOCKING
1376         {
1377                 .ctl_name       = FS_LEASE_TIME,
1378                 .procname       = "lease-break-time",
1379                 .data           = &lease_break_time,
1380                 .maxlen         = sizeof(int),
1381                 .mode           = 0644,
1382                 .proc_handler   = &proc_dointvec,
1383         },
1384 #endif
1385 #ifdef CONFIG_AIO
1386         {
1387                 .procname       = "aio-nr",
1388                 .data           = &aio_nr,
1389                 .maxlen         = sizeof(aio_nr),
1390                 .mode           = 0444,
1391                 .proc_handler   = &proc_doulongvec_minmax,
1392         },
1393         {
1394                 .procname       = "aio-max-nr",
1395                 .data           = &aio_max_nr,
1396                 .maxlen         = sizeof(aio_max_nr),
1397                 .mode           = 0644,
1398                 .proc_handler   = &proc_doulongvec_minmax,
1399         },
1400 #endif /* CONFIG_AIO */
1401 #ifdef CONFIG_INOTIFY_USER
1402         {
1403                 .ctl_name       = FS_INOTIFY,
1404                 .procname       = "inotify",
1405                 .mode           = 0555,
1406                 .child          = inotify_table,
1407         },
1408 #endif  
1409 #ifdef CONFIG_EPOLL
1410         {
1411                 .procname       = "epoll",
1412                 .mode           = 0555,
1413                 .child          = epoll_table,
1414         },
1415 #endif
1416 #endif
1417         {
1418                 .ctl_name       = KERN_SETUID_DUMPABLE,
1419                 .procname       = "suid_dumpable",
1420                 .data           = &suid_dumpable,
1421                 .maxlen         = sizeof(int),
1422                 .mode           = 0644,
1423                 .proc_handler   = &proc_dointvec_minmax,
1424                 .strategy       = &sysctl_intvec,
1425                 .extra1         = &zero,
1426                 .extra2         = &two,
1427         },
1428 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1429         {
1430                 .ctl_name       = CTL_UNNUMBERED,
1431                 .procname       = "binfmt_misc",
1432                 .mode           = 0555,
1433                 .child          = binfmt_misc_table,
1434         },
1435 #endif
1436 /*
1437  * NOTE: do not add new entries to this table unless you have read
1438  * Documentation/sysctl/ctl_unnumbered.txt
1439  */
1440         { .ctl_name = 0 }
1441 };
1442
1443 static struct ctl_table debug_table[] = {
1444 #if defined(CONFIG_X86) || defined(CONFIG_PPC)
1445         {
1446                 .ctl_name       = CTL_UNNUMBERED,
1447                 .procname       = "exception-trace",
1448                 .data           = &show_unhandled_signals,
1449                 .maxlen         = sizeof(int),
1450                 .mode           = 0644,
1451                 .proc_handler   = proc_dointvec
1452         },
1453 #endif
1454         { .ctl_name = 0 }
1455 };
1456
1457 static struct ctl_table dev_table[] = {
1458         { .ctl_name = 0 }
1459 };
1460
1461 static DEFINE_SPINLOCK(sysctl_lock);
1462
1463 /* called under sysctl_lock */
1464 static int use_table(struct ctl_table_header *p)
1465 {
1466         if (unlikely(p->unregistering))
1467                 return 0;
1468         p->used++;
1469         return 1;
1470 }
1471
1472 /* called under sysctl_lock */
1473 static void unuse_table(struct ctl_table_header *p)
1474 {
1475         if (!--p->used)
1476                 if (unlikely(p->unregistering))
1477                         complete(p->unregistering);
1478 }
1479
1480 /* called under sysctl_lock, will reacquire if has to wait */
1481 static void start_unregistering(struct ctl_table_header *p)
1482 {
1483         /*
1484          * if p->used is 0, nobody will ever touch that entry again;
1485          * we'll eliminate all paths to it before dropping sysctl_lock
1486          */
1487         if (unlikely(p->used)) {
1488                 struct completion wait;
1489                 init_completion(&wait);
1490                 p->unregistering = &wait;
1491                 spin_unlock(&sysctl_lock);
1492                 wait_for_completion(&wait);
1493                 spin_lock(&sysctl_lock);
1494         } else {
1495                 /* anything non-NULL; we'll never dereference it */
1496                 p->unregistering = ERR_PTR(-EINVAL);
1497         }
1498         /*
1499          * do not remove from the list until nobody holds it; walking the
1500          * list in do_sysctl() relies on that.
1501          */
1502         list_del_init(&p->ctl_entry);
1503 }
1504
1505 void sysctl_head_get(struct ctl_table_header *head)
1506 {
1507         spin_lock(&sysctl_lock);
1508         head->count++;
1509         spin_unlock(&sysctl_lock);
1510 }
1511
1512 void sysctl_head_put(struct ctl_table_header *head)
1513 {
1514         spin_lock(&sysctl_lock);
1515         if (!--head->count)
1516                 kfree(head);
1517         spin_unlock(&sysctl_lock);
1518 }
1519
1520 struct ctl_table_header *sysctl_head_grab(struct ctl_table_header *head)
1521 {
1522         if (!head)
1523                 BUG();
1524         spin_lock(&sysctl_lock);
1525         if (!use_table(head))
1526                 head = ERR_PTR(-ENOENT);
1527         spin_unlock(&sysctl_lock);
1528         return head;
1529 }
1530
1531 void sysctl_head_finish(struct ctl_table_header *head)
1532 {
1533         if (!head)
1534                 return;
1535         spin_lock(&sysctl_lock);
1536         unuse_table(head);
1537         spin_unlock(&sysctl_lock);
1538 }
1539
1540 static struct ctl_table_set *
1541 lookup_header_set(struct ctl_table_root *root, struct nsproxy *namespaces)
1542 {
1543         struct ctl_table_set *set = &root->default_set;
1544         if (root->lookup)
1545                 set = root->lookup(root, namespaces);
1546         return set;
1547 }
1548
1549 static struct list_head *
1550 lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces)
1551 {
1552         struct ctl_table_set *set = lookup_header_set(root, namespaces);
1553         return &set->list;
1554 }
1555
1556 struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces,
1557                                             struct ctl_table_header *prev)
1558 {
1559         struct ctl_table_root *root;
1560         struct list_head *header_list;
1561         struct ctl_table_header *head;
1562         struct list_head *tmp;
1563
1564         spin_lock(&sysctl_lock);
1565         if (prev) {
1566                 head = prev;
1567                 tmp = &prev->ctl_entry;
1568                 unuse_table(prev);
1569                 goto next;
1570         }
1571         tmp = &root_table_header.ctl_entry;
1572         for (;;) {
1573                 head = list_entry(tmp, struct ctl_table_header, ctl_entry);
1574
1575                 if (!use_table(head))
1576                         goto next;
1577                 spin_unlock(&sysctl_lock);
1578                 return head;
1579         next:
1580                 root = head->root;
1581                 tmp = tmp->next;
1582                 header_list = lookup_header_list(root, namespaces);
1583                 if (tmp != header_list)
1584                         continue;
1585
1586                 do {
1587                         root = list_entry(root->root_list.next,
1588                                         struct ctl_table_root, root_list);
1589                         if (root == &sysctl_table_root)
1590                                 goto out;
1591                         header_list = lookup_header_list(root, namespaces);
1592                 } while (list_empty(header_list));
1593                 tmp = header_list->next;
1594         }
1595 out:
1596         spin_unlock(&sysctl_lock);
1597         return NULL;
1598 }
1599
1600 struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev)
1601 {
1602         return __sysctl_head_next(current->nsproxy, prev);
1603 }
1604
1605 void register_sysctl_root(struct ctl_table_root *root)
1606 {
1607         spin_lock(&sysctl_lock);
1608         list_add_tail(&root->root_list, &sysctl_table_root.root_list);
1609         spin_unlock(&sysctl_lock);
1610 }
1611
1612 #ifdef CONFIG_SYSCTL_SYSCALL
1613 /* Perform the actual read/write of a sysctl table entry. */
1614 static int do_sysctl_strategy(struct ctl_table_root *root,
1615                         struct ctl_table *table,
1616                         void __user *oldval, size_t __user *oldlenp,
1617                         void __user *newval, size_t newlen)
1618 {
1619         int op = 0, rc;
1620
1621         if (oldval)
1622                 op |= MAY_READ;
1623         if (newval)
1624                 op |= MAY_WRITE;
1625         if (sysctl_perm(root, table, op))
1626                 return -EPERM;
1627
1628         if (table->strategy) {
1629                 rc = table->strategy(table, oldval, oldlenp, newval, newlen);
1630                 if (rc < 0)
1631                         return rc;
1632                 if (rc > 0)
1633                         return 0;
1634         }
1635
1636         /* If there is no strategy routine, or if the strategy returns
1637          * zero, proceed with automatic r/w */
1638         if (table->data && table->maxlen) {
1639                 rc = sysctl_data(table, oldval, oldlenp, newval, newlen);
1640                 if (rc < 0)
1641                         return rc;
1642         }
1643         return 0;
1644 }
1645
1646 static int parse_table(int __user *name, int nlen,
1647                        void __user *oldval, size_t __user *oldlenp,
1648                        void __user *newval, size_t newlen,
1649                        struct ctl_table_root *root,
1650                        struct ctl_table *table)
1651 {
1652         int n;
1653 repeat:
1654         if (!nlen)
1655                 return -ENOTDIR;
1656         if (get_user(n, name))
1657                 return -EFAULT;
1658         for ( ; table->ctl_name || table->procname; table++) {
1659                 if (!table->ctl_name)
1660                         continue;
1661                 if (n == table->ctl_name) {
1662                         int error;
1663                         if (table->child) {
1664                                 if (sysctl_perm(root, table, MAY_EXEC))
1665                                         return -EPERM;
1666                                 name++;
1667                                 nlen--;
1668                                 table = table->child;
1669                                 goto repeat;
1670                         }
1671                         error = do_sysctl_strategy(root, table,
1672                                                    oldval, oldlenp,
1673                                                    newval, newlen);
1674                         return error;
1675                 }
1676         }
1677         return -ENOTDIR;
1678 }
1679
1680 int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp,
1681                void __user *newval, size_t newlen)
1682 {
1683         struct ctl_table_header *head;
1684         int error = -ENOTDIR;
1685
1686         if (nlen <= 0 || nlen >= CTL_MAXNAME)
1687                 return -ENOTDIR;
1688         if (oldval) {
1689                 int old_len;
1690                 if (!oldlenp || get_user(old_len, oldlenp))
1691                         return -EFAULT;
1692         }
1693
1694         for (head = sysctl_head_next(NULL); head;
1695                         head = sysctl_head_next(head)) {
1696                 error = parse_table(name, nlen, oldval, oldlenp, 
1697                                         newval, newlen,
1698                                         head->root, head->ctl_table);
1699                 if (error != -ENOTDIR) {
1700                         sysctl_head_finish(head);
1701                         break;
1702                 }
1703         }
1704         return error;
1705 }
1706
1707 SYSCALL_DEFINE1(sysctl, struct __sysctl_args __user *, args)
1708 {
1709         struct __sysctl_args tmp;
1710         int error;
1711
1712         if (copy_from_user(&tmp, args, sizeof(tmp)))
1713                 return -EFAULT;
1714
1715         error = deprecated_sysctl_warning(&tmp);
1716         if (error)
1717                 goto out;
1718
1719         lock_kernel();
1720         error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp,
1721                           tmp.newval, tmp.newlen);
1722         unlock_kernel();
1723 out:
1724         return error;
1725 }
1726 #endif /* CONFIG_SYSCTL_SYSCALL */
1727
1728 /*
1729  * sysctl_perm does NOT grant the superuser all rights automatically, because
1730  * some sysctl variables are readonly even to root.
1731  */
1732
1733 static int test_perm(int mode, int op)
1734 {
1735         if (!current_euid())
1736                 mode >>= 6;
1737         else if (in_egroup_p(0))
1738                 mode >>= 3;
1739         if ((op & ~mode & (MAY_READ|MAY_WRITE|MAY_EXEC)) == 0)
1740                 return 0;
1741         return -EACCES;
1742 }
1743
1744 int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op)
1745 {
1746         int error;
1747         int mode;
1748
1749         error = security_sysctl(table, op & (MAY_READ | MAY_WRITE | MAY_EXEC));
1750         if (error)
1751                 return error;
1752
1753         if (root->permissions)
1754                 mode = root->permissions(root, current->nsproxy, table);
1755         else
1756                 mode = table->mode;
1757
1758         return test_perm(mode, op);
1759 }
1760
1761 static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table)
1762 {
1763         for (; table->ctl_name || table->procname; table++) {
1764                 table->parent = parent;
1765                 if (table->child)
1766                         sysctl_set_parent(table, table->child);
1767         }
1768 }
1769
1770 static __init int sysctl_init(void)
1771 {
1772         sysctl_set_parent(NULL, root_table);
1773 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1774         {
1775                 int err;
1776                 err = sysctl_check_table(current->nsproxy, root_table);
1777         }
1778 #endif
1779         return 0;
1780 }
1781
1782 core_initcall(sysctl_init);
1783
1784 static struct ctl_table *is_branch_in(struct ctl_table *branch,
1785                                       struct ctl_table *table)
1786 {
1787         struct ctl_table *p;
1788         const char *s = branch->procname;
1789
1790         /* branch should have named subdirectory as its first element */
1791         if (!s || !branch->child)
1792                 return NULL;
1793
1794         /* ... and nothing else */
1795         if (branch[1].procname || branch[1].ctl_name)
1796                 return NULL;
1797
1798         /* table should contain subdirectory with the same name */
1799         for (p = table; p->procname || p->ctl_name; p++) {
1800                 if (!p->child)
1801                         continue;
1802                 if (p->procname && strcmp(p->procname, s) == 0)
1803                         return p;
1804         }
1805         return NULL;
1806 }
1807
1808 /* see if attaching q to p would be an improvement */
1809 static void try_attach(struct ctl_table_header *p, struct ctl_table_header *q)
1810 {
1811         struct ctl_table *to = p->ctl_table, *by = q->ctl_table;
1812         struct ctl_table *next;
1813         int is_better = 0;
1814         int not_in_parent = !p->attached_by;
1815
1816         while ((next = is_branch_in(by, to)) != NULL) {
1817                 if (by == q->attached_by)
1818                         is_better = 1;
1819                 if (to == p->attached_by)
1820                         not_in_parent = 1;
1821                 by = by->child;
1822                 to = next->child;
1823         }
1824
1825         if (is_better && not_in_parent) {
1826                 q->attached_by = by;
1827                 q->attached_to = to;
1828                 q->parent = p;
1829         }
1830 }
1831
1832 /**
1833  * __register_sysctl_paths - register a sysctl hierarchy
1834  * @root: List of sysctl headers to register on
1835  * @namespaces: Data to compute which lists of sysctl entries are visible
1836  * @path: The path to the directory the sysctl table is in.
1837  * @table: the top-level table structure
1838  *
1839  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1840  * array. A completely 0 filled entry terminates the table.
1841  *
1842  * The members of the &struct ctl_table structure are used as follows:
1843  *
1844  * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1845  *            must be unique within that level of sysctl
1846  *
1847  * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1848  *            enter a sysctl file
1849  *
1850  * data - a pointer to data for use by proc_handler
1851  *
1852  * maxlen - the maximum size in bytes of the data
1853  *
1854  * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1855  *
1856  * child - a pointer to the child sysctl table if this entry is a directory, or
1857  *         %NULL.
1858  *
1859  * proc_handler - the text handler routine (described below)
1860  *
1861  * strategy - the strategy routine (described below)
1862  *
1863  * de - for internal use by the sysctl routines
1864  *
1865  * extra1, extra2 - extra pointers usable by the proc handler routines
1866  *
1867  * Leaf nodes in the sysctl tree will be represented by a single file
1868  * under /proc; non-leaf nodes will be represented by directories.
1869  *
1870  * sysctl(2) can automatically manage read and write requests through
1871  * the sysctl table.  The data and maxlen fields of the ctl_table
1872  * struct enable minimal validation of the values being written to be
1873  * performed, and the mode field allows minimal authentication.
1874  *
1875  * More sophisticated management can be enabled by the provision of a
1876  * strategy routine with the table entry.  This will be called before
1877  * any automatic read or write of the data is performed.
1878  *
1879  * The strategy routine may return
1880  *
1881  * < 0 - Error occurred (error is passed to user process)
1882  *
1883  * 0   - OK - proceed with automatic read or write.
1884  *
1885  * > 0 - OK - read or write has been done by the strategy routine, so
1886  *       return immediately.
1887  *
1888  * There must be a proc_handler routine for any terminal nodes
1889  * mirrored under /proc/sys (non-terminals are handled by a built-in
1890  * directory handler).  Several default handlers are available to
1891  * cover common cases -
1892  *
1893  * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1894  * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(), 
1895  * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1896  *
1897  * It is the handler's job to read the input buffer from user memory
1898  * and process it. The handler should return 0 on success.
1899  *
1900  * This routine returns %NULL on a failure to register, and a pointer
1901  * to the table header on success.
1902  */
1903 struct ctl_table_header *__register_sysctl_paths(
1904         struct ctl_table_root *root,
1905         struct nsproxy *namespaces,
1906         const struct ctl_path *path, struct ctl_table *table)
1907 {
1908         struct ctl_table_header *header;
1909         struct ctl_table *new, **prevp;
1910         unsigned int n, npath;
1911         struct ctl_table_set *set;
1912
1913         /* Count the path components */
1914         for (npath = 0; path[npath].ctl_name || path[npath].procname; ++npath)
1915                 ;
1916
1917         /*
1918          * For each path component, allocate a 2-element ctl_table array.
1919          * The first array element will be filled with the sysctl entry
1920          * for this, the second will be the sentinel (ctl_name == 0).
1921          *
1922          * We allocate everything in one go so that we don't have to
1923          * worry about freeing additional memory in unregister_sysctl_table.
1924          */
1925         header = kzalloc(sizeof(struct ctl_table_header) +
1926                          (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL);
1927         if (!header)
1928                 return NULL;
1929
1930         new = (struct ctl_table *) (header + 1);
1931
1932         /* Now connect the dots */
1933         prevp = &header->ctl_table;
1934         for (n = 0; n < npath; ++n, ++path) {
1935                 /* Copy the procname */
1936                 new->procname = path->procname;
1937                 new->ctl_name = path->ctl_name;
1938                 new->mode     = 0555;
1939
1940                 *prevp = new;
1941                 prevp = &new->child;
1942
1943                 new += 2;
1944         }
1945         *prevp = table;
1946         header->ctl_table_arg = table;
1947
1948         INIT_LIST_HEAD(&header->ctl_entry);
1949         header->used = 0;
1950         header->unregistering = NULL;
1951         header->root = root;
1952         sysctl_set_parent(NULL, header->ctl_table);
1953         header->count = 1;
1954 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1955         if (sysctl_check_table(namespaces, header->ctl_table)) {
1956                 kfree(header);
1957                 return NULL;
1958         }
1959 #endif
1960         spin_lock(&sysctl_lock);
1961         header->set = lookup_header_set(root, namespaces);
1962         header->attached_by = header->ctl_table;
1963         header->attached_to = root_table;
1964         header->parent = &root_table_header;
1965         for (set = header->set; set; set = set->parent) {
1966                 struct ctl_table_header *p;
1967                 list_for_each_entry(p, &set->list, ctl_entry) {
1968                         if (p->unregistering)
1969                                 continue;
1970                         try_attach(p, header);
1971                 }
1972         }
1973         header->parent->count++;
1974         list_add_tail(&header->ctl_entry, &header->set->list);
1975         spin_unlock(&sysctl_lock);
1976
1977         return header;
1978 }
1979
1980 /**
1981  * register_sysctl_table_path - register a sysctl table hierarchy
1982  * @path: The path to the directory the sysctl table is in.
1983  * @table: the top-level table structure
1984  *
1985  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1986  * array. A completely 0 filled entry terminates the table.
1987  *
1988  * See __register_sysctl_paths for more details.
1989  */
1990 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1991                                                 struct ctl_table *table)
1992 {
1993         return __register_sysctl_paths(&sysctl_table_root, current->nsproxy,
1994                                         path, table);
1995 }
1996
1997 /**
1998  * register_sysctl_table - register a sysctl table hierarchy
1999  * @table: the top-level table structure
2000  *
2001  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
2002  * array. A completely 0 filled entry terminates the table.
2003  *
2004  * See register_sysctl_paths for more details.
2005  */
2006 struct ctl_table_header *register_sysctl_table(struct ctl_table *table)
2007 {
2008         static const struct ctl_path null_path[] = { {} };
2009
2010         return register_sysctl_paths(null_path, table);
2011 }
2012
2013 /**
2014  * unregister_sysctl_table - unregister a sysctl table hierarchy
2015  * @header: the header returned from register_sysctl_table
2016  *
2017  * Unregisters the sysctl table and all children. proc entries may not
2018  * actually be removed until they are no longer used by anyone.
2019  */
2020 void unregister_sysctl_table(struct ctl_table_header * header)
2021 {
2022         might_sleep();
2023
2024         if (header == NULL)
2025                 return;
2026
2027         spin_lock(&sysctl_lock);
2028         start_unregistering(header);
2029         if (!--header->parent->count) {
2030                 WARN_ON(1);
2031                 kfree(header->parent);
2032         }
2033         if (!--header->count)
2034                 kfree(header);
2035         spin_unlock(&sysctl_lock);
2036 }
2037
2038 int sysctl_is_seen(struct ctl_table_header *p)
2039 {
2040         struct ctl_table_set *set = p->set;
2041         int res;
2042         spin_lock(&sysctl_lock);
2043         if (p->unregistering)
2044                 res = 0;
2045         else if (!set->is_seen)
2046                 res = 1;
2047         else
2048                 res = set->is_seen(set);
2049         spin_unlock(&sysctl_lock);
2050         return res;
2051 }
2052
2053 void setup_sysctl_set(struct ctl_table_set *p,
2054         struct ctl_table_set *parent,
2055         int (*is_seen)(struct ctl_table_set *))
2056 {
2057         INIT_LIST_HEAD(&p->list);
2058         p->parent = parent ? parent : &sysctl_table_root.default_set;
2059         p->is_seen = is_seen;
2060 }
2061
2062 #else /* !CONFIG_SYSCTL */
2063 struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
2064 {
2065         return NULL;
2066 }
2067
2068 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
2069                                                     struct ctl_table *table)
2070 {
2071         return NULL;
2072 }
2073
2074 void unregister_sysctl_table(struct ctl_table_header * table)
2075 {
2076 }
2077
2078 void setup_sysctl_set(struct ctl_table_set *p,
2079         struct ctl_table_set *parent,
2080         int (*is_seen)(struct ctl_table_set *))
2081 {
2082 }
2083
2084 void sysctl_head_put(struct ctl_table_header *head)
2085 {
2086 }
2087
2088 #endif /* CONFIG_SYSCTL */
2089
2090 /*
2091  * /proc/sys support
2092  */
2093
2094 #ifdef CONFIG_PROC_SYSCTL
2095
2096 static int _proc_do_string(void* data, int maxlen, int write,
2097                            struct file *filp, void __user *buffer,
2098                            size_t *lenp, loff_t *ppos)
2099 {
2100         size_t len;
2101         char __user *p;
2102         char c;
2103
2104         if (!data || !maxlen || !*lenp) {
2105                 *lenp = 0;
2106                 return 0;
2107         }
2108
2109         if (write) {
2110                 len = 0;
2111                 p = buffer;
2112                 while (len < *lenp) {
2113                         if (get_user(c, p++))
2114                                 return -EFAULT;
2115                         if (c == 0 || c == '\n')
2116                                 break;
2117                         len++;
2118                 }
2119                 if (len >= maxlen)
2120                         len = maxlen-1;
2121                 if(copy_from_user(data, buffer, len))
2122                         return -EFAULT;
2123                 ((char *) data)[len] = 0;
2124                 *ppos += *lenp;
2125         } else {
2126                 len = strlen(data);
2127                 if (len > maxlen)
2128                         len = maxlen;
2129
2130                 if (*ppos > len) {
2131                         *lenp = 0;
2132                         return 0;
2133                 }
2134
2135                 data += *ppos;
2136                 len  -= *ppos;
2137
2138                 if (len > *lenp)
2139                         len = *lenp;
2140                 if (len)
2141                         if(copy_to_user(buffer, data, len))
2142                                 return -EFAULT;
2143                 if (len < *lenp) {
2144                         if(put_user('\n', ((char __user *) buffer) + len))
2145                                 return -EFAULT;
2146                         len++;
2147                 }
2148                 *lenp = len;
2149                 *ppos += len;
2150         }
2151         return 0;
2152 }
2153
2154 /**
2155  * proc_dostring - read a string sysctl
2156  * @table: the sysctl table
2157  * @write: %TRUE if this is a write to the sysctl file
2158  * @filp: the file structure
2159  * @buffer: the user buffer
2160  * @lenp: the size of the user buffer
2161  * @ppos: file position
2162  *
2163  * Reads/writes a string from/to the user buffer. If the kernel
2164  * buffer provided is not large enough to hold the string, the
2165  * string is truncated. The copied string is %NULL-terminated.
2166  * If the string is being read by the user process, it is copied
2167  * and a newline '\n' is added. It is truncated if the buffer is
2168  * not large enough.
2169  *
2170  * Returns 0 on success.
2171  */
2172 int proc_dostring(struct ctl_table *table, int write, struct file *filp,
2173                   void __user *buffer, size_t *lenp, loff_t *ppos)
2174 {
2175         return _proc_do_string(table->data, table->maxlen, write, filp,
2176                                buffer, lenp, ppos);
2177 }
2178
2179
2180 static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp,
2181                                  int *valp,
2182                                  int write, void *data)
2183 {
2184         if (write) {
2185                 *valp = *negp ? -*lvalp : *lvalp;
2186         } else {
2187                 int val = *valp;
2188                 if (val < 0) {
2189                         *negp = -1;
2190                         *lvalp = (unsigned long)-val;
2191                 } else {
2192                         *negp = 0;
2193                         *lvalp = (unsigned long)val;
2194                 }
2195         }
2196         return 0;
2197 }
2198
2199 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
2200                   int write, struct file *filp, void __user *buffer,
2201                   size_t *lenp, loff_t *ppos,
2202                   int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2203                               int write, void *data),
2204                   void *data)
2205 {
2206 #define TMPBUFLEN 21
2207         int *i, vleft, first=1, neg, val;
2208         unsigned long lval;
2209         size_t left, len;
2210         
2211         char buf[TMPBUFLEN], *p;
2212         char __user *s = buffer;
2213         
2214         if (!tbl_data || !table->maxlen || !*lenp ||
2215             (*ppos && !write)) {
2216                 *lenp = 0;
2217                 return 0;
2218         }
2219         
2220         i = (int *) tbl_data;
2221         vleft = table->maxlen / sizeof(*i);
2222         left = *lenp;
2223
2224         if (!conv)
2225                 conv = do_proc_dointvec_conv;
2226
2227         for (; left && vleft--; i++, first=0) {
2228                 if (write) {
2229                         while (left) {
2230                                 char c;
2231                                 if (get_user(c, s))
2232                                         return -EFAULT;
2233                                 if (!isspace(c))
2234                                         break;
2235                                 left--;
2236                                 s++;
2237                         }
2238                         if (!left)
2239                                 break;
2240                         neg = 0;
2241                         len = left;
2242                         if (len > sizeof(buf) - 1)
2243                                 len = sizeof(buf) - 1;
2244                         if (copy_from_user(buf, s, len))
2245                                 return -EFAULT;
2246                         buf[len] = 0;
2247                         p = buf;
2248                         if (*p == '-' && left > 1) {
2249                                 neg = 1;
2250                                 p++;
2251                         }
2252                         if (*p < '0' || *p > '9')
2253                                 break;
2254
2255                         lval = simple_strtoul(p, &p, 0);
2256
2257                         len = p-buf;
2258                         if ((len < left) && *p && !isspace(*p))
2259                                 break;
2260                         if (neg)
2261                                 val = -val;
2262                         s += len;
2263                         left -= len;
2264
2265                         if (conv(&neg, &lval, i, 1, data))
2266                                 break;
2267                 } else {
2268                         p = buf;
2269                         if (!first)
2270                                 *p++ = '\t';
2271         
2272                         if (conv(&neg, &lval, i, 0, data))
2273                                 break;
2274
2275                         sprintf(p, "%s%lu", neg ? "-" : "", lval);
2276                         len = strlen(buf);
2277                         if (len > left)
2278                                 len = left;
2279                         if(copy_to_user(s, buf, len))
2280                                 return -EFAULT;
2281                         left -= len;
2282                         s += len;
2283                 }
2284         }
2285
2286         if (!write && !first && left) {
2287                 if(put_user('\n', s))
2288                         return -EFAULT;
2289                 left--, s++;
2290         }
2291         if (write) {
2292                 while (left) {
2293                         char c;
2294                         if (get_user(c, s++))
2295                                 return -EFAULT;
2296                         if (!isspace(c))
2297                                 break;
2298                         left--;
2299                 }
2300         }
2301         if (write && first)
2302                 return -EINVAL;
2303         *lenp -= left;
2304         *ppos += *lenp;
2305         return 0;
2306 #undef TMPBUFLEN
2307 }
2308
2309 static int do_proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2310                   void __user *buffer, size_t *lenp, loff_t *ppos,
2311                   int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2312                               int write, void *data),
2313                   void *data)
2314 {
2315         return __do_proc_dointvec(table->data, table, write, filp,
2316                         buffer, lenp, ppos, conv, data);
2317 }
2318
2319 /**
2320  * proc_dointvec - read a vector of integers
2321  * @table: the sysctl table
2322  * @write: %TRUE if this is a write to the sysctl file
2323  * @filp: the file structure
2324  * @buffer: the user buffer
2325  * @lenp: the size of the user buffer
2326  * @ppos: file position
2327  *
2328  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2329  * values from/to the user buffer, treated as an ASCII string. 
2330  *
2331  * Returns 0 on success.
2332  */
2333 int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2334                      void __user *buffer, size_t *lenp, loff_t *ppos)
2335 {
2336     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2337                             NULL,NULL);
2338 }
2339
2340 /*
2341  * Taint values can only be increased
2342  * This means we can safely use a temporary.
2343  */
2344 static int proc_taint(struct ctl_table *table, int write, struct file *filp,
2345                                void __user *buffer, size_t *lenp, loff_t *ppos)
2346 {
2347         struct ctl_table t;
2348         unsigned long tmptaint = get_taint();
2349         int err;
2350
2351         if (write && !capable(CAP_SYS_ADMIN))
2352                 return -EPERM;
2353
2354         t = *table;
2355         t.data = &tmptaint;
2356         err = proc_doulongvec_minmax(&t, write, filp, buffer, lenp, ppos);
2357         if (err < 0)
2358                 return err;
2359
2360         if (write) {
2361                 /*
2362                  * Poor man's atomic or. Not worth adding a primitive
2363                  * to everyone's atomic.h for this
2364                  */
2365                 int i;
2366                 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2367                         if ((tmptaint >> i) & 1)
2368                                 add_taint(i);
2369                 }
2370         }
2371
2372         return err;
2373 }
2374
2375 struct do_proc_dointvec_minmax_conv_param {
2376         int *min;
2377         int *max;
2378 };
2379
2380 static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp, 
2381                                         int *valp, 
2382                                         int write, void *data)
2383 {
2384         struct do_proc_dointvec_minmax_conv_param *param = data;
2385         if (write) {
2386                 int val = *negp ? -*lvalp : *lvalp;
2387                 if ((param->min && *param->min > val) ||
2388                     (param->max && *param->max < val))
2389                         return -EINVAL;
2390                 *valp = val;
2391         } else {
2392                 int val = *valp;
2393                 if (val < 0) {
2394                         *negp = -1;
2395                         *lvalp = (unsigned long)-val;
2396                 } else {
2397                         *negp = 0;
2398                         *lvalp = (unsigned long)val;
2399                 }
2400         }
2401         return 0;
2402 }
2403
2404 /**
2405  * proc_dointvec_minmax - read a vector of integers with min/max values
2406  * @table: the sysctl table
2407  * @write: %TRUE if this is a write to the sysctl file
2408  * @filp: the file structure
2409  * @buffer: the user buffer
2410  * @lenp: the size of the user buffer
2411  * @ppos: file position
2412  *
2413  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2414  * values from/to the user buffer, treated as an ASCII string.
2415  *
2416  * This routine will ensure the values are within the range specified by
2417  * table->extra1 (min) and table->extra2 (max).
2418  *
2419  * Returns 0 on success.
2420  */
2421 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
2422                   void __user *buffer, size_t *lenp, loff_t *ppos)
2423 {
2424         struct do_proc_dointvec_minmax_conv_param param = {
2425                 .min = (int *) table->extra1,
2426                 .max = (int *) table->extra2,
2427         };
2428         return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2429                                 do_proc_dointvec_minmax_conv, &param);
2430 }
2431
2432 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2433                                      struct file *filp,
2434                                      void __user *buffer,
2435                                      size_t *lenp, loff_t *ppos,
2436                                      unsigned long convmul,
2437                                      unsigned long convdiv)
2438 {
2439 #define TMPBUFLEN 21
2440         unsigned long *i, *min, *max, val;
2441         int vleft, first=1, neg;
2442         size_t len, left;
2443         char buf[TMPBUFLEN], *p;
2444         char __user *s = buffer;
2445         
2446         if (!data || !table->maxlen || !*lenp ||
2447             (*ppos && !write)) {
2448                 *lenp = 0;
2449                 return 0;
2450         }
2451         
2452         i = (unsigned long *) data;
2453         min = (unsigned long *) table->extra1;
2454         max = (unsigned long *) table->extra2;
2455         vleft = table->maxlen / sizeof(unsigned long);
2456         left = *lenp;
2457         
2458         for (; left && vleft--; i++, min++, max++, first=0) {
2459                 if (write) {
2460                         while (left) {
2461                                 char c;
2462                                 if (get_user(c, s))
2463                                         return -EFAULT;
2464                                 if (!isspace(c))
2465                                         break;
2466                                 left--;
2467                                 s++;
2468                         }
2469                         if (!left)
2470                                 break;
2471                         neg = 0;
2472                         len = left;
2473                         if (len > TMPBUFLEN-1)
2474                                 len = TMPBUFLEN-1;
2475                         if (copy_from_user(buf, s, len))
2476                                 return -EFAULT;
2477                         buf[len] = 0;
2478                         p = buf;
2479                         if (*p == '-' && left > 1) {
2480                                 neg = 1;
2481                                 p++;
2482                         }
2483                         if (*p < '0' || *p > '9')
2484                                 break;
2485                         val = simple_strtoul(p, &p, 0) * convmul / convdiv ;
2486                         len = p-buf;
2487                         if ((len < left) && *p && !isspace(*p))
2488                                 break;
2489                         if (neg)
2490                                 val = -val;
2491                         s += len;
2492                         left -= len;
2493
2494                         if(neg)
2495                                 continue;
2496                         if ((min && val < *min) || (max && val > *max))
2497                                 continue;
2498                         *i = val;
2499                 } else {
2500                         p = buf;
2501                         if (!first)
2502                                 *p++ = '\t';
2503                         sprintf(p, "%lu", convdiv * (*i) / convmul);
2504                         len = strlen(buf);
2505                         if (len > left)
2506                                 len = left;
2507                         if(copy_to_user(s, buf, len))
2508                                 return -EFAULT;
2509                         left -= len;
2510                         s += len;
2511                 }
2512         }
2513
2514         if (!write && !first && left) {
2515                 if(put_user('\n', s))
2516                         return -EFAULT;
2517                 left--, s++;
2518         }
2519         if (write) {
2520                 while (left) {
2521                         char c;
2522                         if (get_user(c, s++))
2523                                 return -EFAULT;
2524                         if (!isspace(c))
2525                                 break;
2526                         left--;
2527                 }
2528         }
2529         if (write && first)
2530                 return -EINVAL;
2531         *lenp -= left;
2532         *ppos += *lenp;
2533         return 0;
2534 #undef TMPBUFLEN
2535 }
2536
2537 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2538                                      struct file *filp,
2539                                      void __user *buffer,
2540                                      size_t *lenp, loff_t *ppos,
2541                                      unsigned long convmul,
2542                                      unsigned long convdiv)
2543 {
2544         return __do_proc_doulongvec_minmax(table->data, table, write,
2545                         filp, buffer, lenp, ppos, convmul, convdiv);
2546 }
2547
2548 /**
2549  * proc_doulongvec_minmax - read a vector of long integers with min/max values
2550  * @table: the sysctl table
2551  * @write: %TRUE if this is a write to the sysctl file
2552  * @filp: the file structure
2553  * @buffer: the user buffer
2554  * @lenp: the size of the user buffer
2555  * @ppos: file position
2556  *
2557  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2558  * values from/to the user buffer, treated as an ASCII string.
2559  *
2560  * This routine will ensure the values are within the range specified by
2561  * table->extra1 (min) and table->extra2 (max).
2562  *
2563  * Returns 0 on success.
2564  */
2565 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
2566                            void __user *buffer, size_t *lenp, loff_t *ppos)
2567 {
2568     return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l);
2569 }
2570
2571 /**
2572  * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2573  * @table: the sysctl table
2574  * @write: %TRUE if this is a write to the sysctl file
2575  * @filp: the file structure
2576  * @buffer: the user buffer
2577  * @lenp: the size of the user buffer
2578  * @ppos: file position
2579  *
2580  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2581  * values from/to the user buffer, treated as an ASCII string. The values
2582  * are treated as milliseconds, and converted to jiffies when they are stored.
2583  *
2584  * This routine will ensure the values are within the range specified by
2585  * table->extra1 (min) and table->extra2 (max).
2586  *
2587  * Returns 0 on success.
2588  */
2589 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2590                                       struct file *filp,
2591                                       void __user *buffer,
2592                                       size_t *lenp, loff_t *ppos)
2593 {
2594     return do_proc_doulongvec_minmax(table, write, filp, buffer,
2595                                      lenp, ppos, HZ, 1000l);
2596 }
2597
2598
2599 static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp,
2600                                          int *valp,
2601                                          int write, void *data)
2602 {
2603         if (write) {
2604                 if (*lvalp > LONG_MAX / HZ)
2605                         return 1;
2606                 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2607         } else {
2608                 int val = *valp;
2609                 unsigned long lval;
2610                 if (val < 0) {
2611                         *negp = -1;
2612                         lval = (unsigned long)-val;
2613                 } else {
2614                         *negp = 0;
2615                         lval = (unsigned long)val;
2616                 }
2617                 *lvalp = lval / HZ;
2618         }
2619         return 0;
2620 }
2621
2622 static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp,
2623                                                 int *valp,
2624                                                 int write, void *data)
2625 {
2626         if (write) {
2627                 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2628                         return 1;
2629                 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2630         } else {
2631                 int val = *valp;
2632                 unsigned long lval;
2633                 if (val < 0) {
2634                         *negp = -1;
2635                         lval = (unsigned long)-val;
2636                 } else {
2637                         *negp = 0;
2638                         lval = (unsigned long)val;
2639                 }
2640                 *lvalp = jiffies_to_clock_t(lval);
2641         }
2642         return 0;
2643 }
2644
2645 static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp,
2646                                             int *valp,
2647                                             int write, void *data)
2648 {
2649         if (write) {
2650                 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2651         } else {
2652                 int val = *valp;
2653                 unsigned long lval;
2654                 if (val < 0) {
2655                         *negp = -1;
2656                         lval = (unsigned long)-val;
2657                 } else {
2658                         *negp = 0;
2659                         lval = (unsigned long)val;
2660                 }
2661                 *lvalp = jiffies_to_msecs(lval);
2662         }
2663         return 0;
2664 }
2665
2666 /**
2667  * proc_dointvec_jiffies - read a vector of integers as seconds
2668  * @table: the sysctl table
2669  * @write: %TRUE if this is a write to the sysctl file
2670  * @filp: the file structure
2671  * @buffer: the user buffer
2672  * @lenp: the size of the user buffer
2673  * @ppos: file position
2674  *
2675  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2676  * values from/to the user buffer, treated as an ASCII string. 
2677  * The values read are assumed to be in seconds, and are converted into
2678  * jiffies.
2679  *
2680  * Returns 0 on success.
2681  */
2682 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
2683                           void __user *buffer, size_t *lenp, loff_t *ppos)
2684 {
2685     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2686                             do_proc_dointvec_jiffies_conv,NULL);
2687 }
2688
2689 /**
2690  * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2691  * @table: the sysctl table
2692  * @write: %TRUE if this is a write to the sysctl file
2693  * @filp: the file structure
2694  * @buffer: the user buffer
2695  * @lenp: the size of the user buffer
2696  * @ppos: pointer to the file position
2697  *
2698  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2699  * values from/to the user buffer, treated as an ASCII string. 
2700  * The values read are assumed to be in 1/USER_HZ seconds, and 
2701  * are converted into jiffies.
2702  *
2703  * Returns 0 on success.
2704  */
2705 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
2706                                  void __user *buffer, size_t *lenp, loff_t *ppos)
2707 {
2708     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2709                             do_proc_dointvec_userhz_jiffies_conv,NULL);
2710 }
2711
2712 /**
2713  * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2714  * @table: the sysctl table
2715  * @write: %TRUE if this is a write to the sysctl file
2716  * @filp: the file structure
2717  * @buffer: the user buffer
2718  * @lenp: the size of the user buffer
2719  * @ppos: file position
2720  * @ppos: the current position in the file
2721  *
2722  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2723  * values from/to the user buffer, treated as an ASCII string. 
2724  * The values read are assumed to be in 1/1000 seconds, and 
2725  * are converted into jiffies.
2726  *
2727  * Returns 0 on success.
2728  */
2729 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
2730                              void __user *buffer, size_t *lenp, loff_t *ppos)
2731 {
2732         return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2733                                 do_proc_dointvec_ms_jiffies_conv, NULL);
2734 }
2735
2736 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
2737                            void __user *buffer, size_t *lenp, loff_t *ppos)
2738 {
2739         struct pid *new_pid;
2740         pid_t tmp;
2741         int r;
2742
2743         tmp = pid_vnr(cad_pid);
2744
2745         r = __do_proc_dointvec(&tmp, table, write, filp, buffer,
2746                                lenp, ppos, NULL, NULL);
2747         if (r || !write)
2748                 return r;
2749
2750         new_pid = find_get_pid(tmp);
2751         if (!new_pid)
2752                 return -ESRCH;
2753
2754         put_pid(xchg(&cad_pid, new_pid));
2755         return 0;
2756 }
2757
2758 #else /* CONFIG_PROC_FS */
2759
2760 int proc_dostring(struct ctl_table *table, int write, struct file *filp,
2761                   void __user *buffer, size_t *lenp, loff_t *ppos)
2762 {
2763         return -ENOSYS;
2764 }
2765
2766 int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2767                   void __user *buffer, size_t *lenp, loff_t *ppos)
2768 {
2769         return -ENOSYS;
2770 }
2771
2772 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
2773                     void __user *buffer, size_t *lenp, loff_t *ppos)
2774 {
2775         return -ENOSYS;
2776 }
2777
2778 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
2779                     void __user *buffer, size_t *lenp, loff_t *ppos)
2780 {
2781         return -ENOSYS;
2782 }
2783
2784 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
2785                     void __user *buffer, size_t *lenp, loff_t *ppos)
2786 {
2787         return -ENOSYS;
2788 }
2789
2790 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
2791                              void __user *buffer, size_t *lenp, loff_t *ppos)
2792 {
2793         return -ENOSYS;
2794 }
2795
2796 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
2797                     void __user *buffer, size_t *lenp, loff_t *ppos)
2798 {
2799         return -ENOSYS;
2800 }
2801
2802 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2803                                       struct file *filp,
2804                                       void __user *buffer,
2805                                       size_t *lenp, loff_t *ppos)
2806 {
2807     return -ENOSYS;
2808 }
2809
2810
2811 #endif /* CONFIG_PROC_FS */
2812
2813
2814 #ifdef CONFIG_SYSCTL_SYSCALL
2815 /*
2816  * General sysctl support routines 
2817  */
2818
2819 /* The generic sysctl data routine (used if no strategy routine supplied) */
2820 int sysctl_data(struct ctl_table *table,
2821                 void __user *oldval, size_t __user *oldlenp,
2822                 void __user *newval, size_t newlen)
2823 {
2824         size_t len;
2825
2826         /* Get out of I don't have a variable */
2827         if (!table->data || !table->maxlen)
2828                 return -ENOTDIR;
2829
2830         if (oldval && oldlenp) {
2831                 if (get_user(len, oldlenp))
2832                         return -EFAULT;
2833                 if (len) {
2834                         if (len > table->maxlen)
2835                                 len = table->maxlen;
2836                         if (copy_to_user(oldval, table->data, len))
2837                                 return -EFAULT;
2838                         if (put_user(len, oldlenp))
2839                                 return -EFAULT;
2840                 }
2841         }
2842
2843         if (newval && newlen) {
2844                 if (newlen > table->maxlen)
2845                         newlen = table->maxlen;
2846
2847                 if (copy_from_user(table->data, newval, newlen))
2848                         return -EFAULT;
2849         }
2850         return 1;
2851 }
2852
2853 /* The generic string strategy routine: */
2854 int sysctl_string(struct ctl_table *table,
2855                   void __user *oldval, size_t __user *oldlenp,
2856                   void __user *newval, size_t newlen)
2857 {
2858         if (!table->data || !table->maxlen) 
2859                 return -ENOTDIR;
2860         
2861         if (oldval && oldlenp) {
2862                 size_t bufsize;
2863                 if (get_user(bufsize, oldlenp))
2864                         return -EFAULT;
2865                 if (bufsize) {
2866                         size_t len = strlen(table->data), copied;
2867
2868                         /* This shouldn't trigger for a well-formed sysctl */
2869                         if (len > table->maxlen)
2870                                 len = table->maxlen;
2871
2872                         /* Copy up to a max of bufsize-1 bytes of the string */
2873                         copied = (len >= bufsize) ? bufsize - 1 : len;
2874
2875                         if (copy_to_user(oldval, table->data, copied) ||
2876                             put_user(0, (char __user *)(oldval + copied)))
2877                                 return -EFAULT;
2878                         if (put_user(len, oldlenp))
2879                                 return -EFAULT;
2880                 }
2881         }
2882         if (newval && newlen) {
2883                 size_t len = newlen;
2884                 if (len > table->maxlen)
2885                         len = table->maxlen;
2886                 if(copy_from_user(table->data, newval, len))
2887                         return -EFAULT;
2888                 if (len == table->maxlen)
2889                         len--;
2890                 ((char *) table->data)[len] = 0;
2891         }
2892         return 1;
2893 }
2894
2895 /*
2896  * This function makes sure that all of the integers in the vector
2897  * are between the minimum and maximum values given in the arrays
2898  * table->extra1 and table->extra2, respectively.
2899  */
2900 int sysctl_intvec(struct ctl_table *table,
2901                 void __user *oldval, size_t __user *oldlenp,
2902                 void __user *newval, size_t newlen)
2903 {
2904
2905         if (newval && newlen) {
2906                 int __user *vec = (int __user *) newval;
2907                 int *min = (int *) table->extra1;
2908                 int *max = (int *) table->extra2;
2909                 size_t length;
2910                 int i;
2911
2912                 if (newlen % sizeof(int) != 0)
2913                         return -EINVAL;
2914
2915                 if (!table->extra1 && !table->extra2)
2916                         return 0;
2917
2918                 if (newlen > table->maxlen)
2919                         newlen = table->maxlen;
2920                 length = newlen / sizeof(int);
2921
2922                 for (i = 0; i < length; i++) {
2923                         int value;
2924                         if (get_user(value, vec + i))
2925                                 return -EFAULT;
2926                         if (min && value < min[i])
2927                                 return -EINVAL;
2928                         if (max && value > max[i])
2929                                 return -EINVAL;
2930                 }
2931         }
2932         return 0;
2933 }
2934
2935 /* Strategy function to convert jiffies to seconds */ 
2936 int sysctl_jiffies(struct ctl_table *table,
2937                 void __user *oldval, size_t __user *oldlenp,
2938                 void __user *newval, size_t newlen)
2939 {
2940         if (oldval && oldlenp) {
2941                 size_t olen;
2942
2943                 if (get_user(olen, oldlenp))
2944                         return -EFAULT;
2945                 if (olen) {
2946                         int val;
2947
2948                         if (olen < sizeof(int))
2949                                 return -EINVAL;
2950
2951                         val = *(int *)(table->data) / HZ;
2952                         if (put_user(val, (int __user *)oldval))
2953                                 return -EFAULT;
2954                         if (put_user(sizeof(int), oldlenp))
2955                                 return -EFAULT;
2956                 }
2957         }
2958         if (newval && newlen) { 
2959                 int new;
2960                 if (newlen != sizeof(int))
2961                         return -EINVAL; 
2962                 if (get_user(new, (int __user *)newval))
2963                         return -EFAULT;
2964                 *(int *)(table->data) = new*HZ; 
2965         }
2966         return 1;
2967 }
2968
2969 /* Strategy function to convert jiffies to seconds */ 
2970 int sysctl_ms_jiffies(struct ctl_table *table,
2971                 void __user *oldval, size_t __user *oldlenp,
2972                 void __user *newval, size_t newlen)
2973 {
2974         if (oldval && oldlenp) {
2975                 size_t olen;
2976
2977                 if (get_user(olen, oldlenp))
2978                         return -EFAULT;
2979                 if (olen) {
2980                         int val;
2981
2982                         if (olen < sizeof(int))
2983                                 return -EINVAL;
2984
2985                         val = jiffies_to_msecs(*(int *)(table->data));
2986                         if (put_user(val, (int __user *)oldval))
2987                                 return -EFAULT;
2988                         if (put_user(sizeof(int), oldlenp))
2989                                 return -EFAULT;
2990                 }
2991         }
2992         if (newval && newlen) { 
2993                 int new;
2994                 if (newlen != sizeof(int))
2995                         return -EINVAL; 
2996                 if (get_user(new, (int __user *)newval))
2997                         return -EFAULT;
2998                 *(int *)(table->data) = msecs_to_jiffies(new);
2999         }
3000         return 1;
3001 }
3002
3003
3004
3005 #else /* CONFIG_SYSCTL_SYSCALL */
3006
3007
3008 SYSCALL_DEFINE1(sysctl, struct __sysctl_args __user *, args)
3009 {
3010         struct __sysctl_args tmp;
3011         int error;
3012
3013         if (copy_from_user(&tmp, args, sizeof(tmp)))
3014                 return -EFAULT;
3015
3016         error = deprecated_sysctl_warning(&tmp);
3017
3018         /* If no error reading the parameters then just -ENOSYS ... */
3019         if (!error)
3020                 error = -ENOSYS;
3021
3022         return error;
3023 }
3024
3025 int sysctl_data(struct ctl_table *table,
3026                   void __user *oldval, size_t __user *oldlenp,
3027                   void __user *newval, size_t newlen)
3028 {
3029         return -ENOSYS;
3030 }
3031
3032 int sysctl_string(struct ctl_table *table,
3033                   void __user *oldval, size_t __user *oldlenp,
3034                   void __user *newval, size_t newlen)
3035 {
3036         return -ENOSYS;
3037 }
3038
3039 int sysctl_intvec(struct ctl_table *table,
3040                 void __user *oldval, size_t __user *oldlenp,
3041                 void __user *newval, size_t newlen)
3042 {
3043         return -ENOSYS;
3044 }
3045
3046 int sysctl_jiffies(struct ctl_table *table,
3047                 void __user *oldval, size_t __user *oldlenp,
3048                 void __user *newval, size_t newlen)
3049 {
3050         return -ENOSYS;
3051 }
3052
3053 int sysctl_ms_jiffies(struct ctl_table *table,
3054                 void __user *oldval, size_t __user *oldlenp,
3055                 void __user *newval, size_t newlen)
3056 {
3057         return -ENOSYS;
3058 }
3059
3060 #endif /* CONFIG_SYSCTL_SYSCALL */
3061
3062 static int deprecated_sysctl_warning(struct __sysctl_args *args)
3063 {
3064         static int msg_count;
3065         int name[CTL_MAXNAME];
3066         int i;
3067
3068         /* Check args->nlen. */
3069         if (args->nlen < 0 || args->nlen > CTL_MAXNAME)
3070                 return -ENOTDIR;
3071
3072         /* Read in the sysctl name for better debug message logging */
3073         for (i = 0; i < args->nlen; i++)
3074                 if (get_user(name[i], args->name + i))
3075                         return -EFAULT;
3076
3077         /* Ignore accesses to kernel.version */
3078         if ((args->nlen == 2) && (name[0] == CTL_KERN) && (name[1] == KERN_VERSION))
3079                 return 0;
3080
3081         if (msg_count < 5) {
3082                 msg_count++;
3083                 printk(KERN_INFO
3084                         "warning: process `%s' used the deprecated sysctl "
3085                         "system call with ", current->comm);
3086                 for (i = 0; i < args->nlen; i++)
3087                         printk("%d.", name[i]);
3088                 printk("\n");
3089         }
3090         return 0;
3091 }
3092
3093 /*
3094  * No sense putting this after each symbol definition, twice,
3095  * exception granted :-)
3096  */
3097 EXPORT_SYMBOL(proc_dointvec);
3098 EXPORT_SYMBOL(proc_dointvec_jiffies);
3099 EXPORT_SYMBOL(proc_dointvec_minmax);
3100 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
3101 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
3102 EXPORT_SYMBOL(proc_dostring);
3103 EXPORT_SYMBOL(proc_doulongvec_minmax);
3104 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
3105 EXPORT_SYMBOL(register_sysctl_table);
3106 EXPORT_SYMBOL(register_sysctl_paths);
3107 EXPORT_SYMBOL(sysctl_intvec);
3108 EXPORT_SYMBOL(sysctl_jiffies);
3109 EXPORT_SYMBOL(sysctl_ms_jiffies);
3110 EXPORT_SYMBOL(sysctl_string);
3111 EXPORT_SYMBOL(sysctl_data);
3112 EXPORT_SYMBOL(unregister_sysctl_table);