dm raid1: fix error count
[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
52 #include <asm/uaccess.h>
53 #include <asm/processor.h>
54
55 #ifdef CONFIG_X86
56 #include <asm/nmi.h>
57 #include <asm/stacktrace.h>
58 #include <asm/io.h>
59 #endif
60
61 static int deprecated_sysctl_warning(struct __sysctl_args *args);
62
63 #if defined(CONFIG_SYSCTL)
64
65 /* External variables not in a header file. */
66 extern int C_A_D;
67 extern int print_fatal_signals;
68 extern int sysctl_overcommit_memory;
69 extern int sysctl_overcommit_ratio;
70 extern int sysctl_panic_on_oom;
71 extern int sysctl_oom_kill_allocating_task;
72 extern int sysctl_oom_dump_tasks;
73 extern int max_threads;
74 extern int core_uses_pid;
75 extern int suid_dumpable;
76 extern char core_pattern[];
77 extern int pid_max;
78 extern int min_free_kbytes;
79 extern int pid_max_min, pid_max_max;
80 extern int sysctl_drop_caches;
81 extern int percpu_pagelist_fraction;
82 extern int compat_log;
83 extern int latencytop_enabled;
84 extern int sysctl_nr_open_min, sysctl_nr_open_max;
85 #ifdef CONFIG_RCU_TORTURE_TEST
86 extern int rcutorture_runnable;
87 #endif /* #ifdef CONFIG_RCU_TORTURE_TEST */
88
89 /* Constants used for minimum and  maximum */
90 #if defined(CONFIG_HIGHMEM) || defined(CONFIG_DETECT_SOFTLOCKUP)
91 static int one = 1;
92 #endif
93
94 #ifdef CONFIG_DETECT_SOFTLOCKUP
95 static int sixty = 60;
96 static int neg_one = -1;
97 #endif
98
99 #if defined(CONFIG_MMU) && defined(CONFIG_FILE_LOCKING)
100 static int two = 2;
101 #endif
102
103 static int zero;
104 static int one_hundred = 100;
105
106 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
107 static int maxolduid = 65535;
108 static int minolduid;
109 static int min_percpu_pagelist_fract = 8;
110
111 static int ngroups_max = NGROUPS_MAX;
112
113 #ifdef CONFIG_MODULES
114 extern char modprobe_path[];
115 #endif
116 #ifdef CONFIG_CHR_DEV_SG
117 extern int sg_big_buff;
118 #endif
119
120 #ifdef CONFIG_SPARC
121 #include <asm/system.h>
122 #endif
123
124 #ifdef CONFIG_SPARC64
125 extern int sysctl_tsb_ratio;
126 #endif
127
128 #ifdef __hppa__
129 extern int pwrsw_enabled;
130 extern int unaligned_enabled;
131 #endif
132
133 #ifdef CONFIG_S390
134 #ifdef CONFIG_MATHEMU
135 extern int sysctl_ieee_emulation_warnings;
136 #endif
137 extern int sysctl_userprocess_debug;
138 extern int spin_retry;
139 #endif
140
141 #ifdef CONFIG_BSD_PROCESS_ACCT
142 extern int acct_parm[];
143 #endif
144
145 #ifdef CONFIG_IA64
146 extern int no_unaligned_warning;
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 #endif
785 #ifdef CONFIG_DETECT_SOFTLOCKUP
786         {
787                 .ctl_name       = CTL_UNNUMBERED,
788                 .procname       = "softlockup_panic",
789                 .data           = &softlockup_panic,
790                 .maxlen         = sizeof(int),
791                 .mode           = 0644,
792                 .proc_handler   = &proc_dointvec_minmax,
793                 .strategy       = &sysctl_intvec,
794                 .extra1         = &zero,
795                 .extra2         = &one,
796         },
797         {
798                 .ctl_name       = CTL_UNNUMBERED,
799                 .procname       = "softlockup_thresh",
800                 .data           = &softlockup_thresh,
801                 .maxlen         = sizeof(int),
802                 .mode           = 0644,
803                 .proc_handler   = &proc_dointvec_minmax,
804                 .strategy       = &sysctl_intvec,
805                 .extra1         = &neg_one,
806                 .extra2         = &sixty,
807         },
808         {
809                 .ctl_name       = CTL_UNNUMBERED,
810                 .procname       = "hung_task_check_count",
811                 .data           = &sysctl_hung_task_check_count,
812                 .maxlen         = sizeof(unsigned long),
813                 .mode           = 0644,
814                 .proc_handler   = &proc_doulongvec_minmax,
815                 .strategy       = &sysctl_intvec,
816         },
817         {
818                 .ctl_name       = CTL_UNNUMBERED,
819                 .procname       = "hung_task_timeout_secs",
820                 .data           = &sysctl_hung_task_timeout_secs,
821                 .maxlen         = sizeof(unsigned long),
822                 .mode           = 0644,
823                 .proc_handler   = &proc_doulongvec_minmax,
824                 .strategy       = &sysctl_intvec,
825         },
826         {
827                 .ctl_name       = CTL_UNNUMBERED,
828                 .procname       = "hung_task_warnings",
829                 .data           = &sysctl_hung_task_warnings,
830                 .maxlen         = sizeof(unsigned long),
831                 .mode           = 0644,
832                 .proc_handler   = &proc_doulongvec_minmax,
833                 .strategy       = &sysctl_intvec,
834         },
835 #endif
836 #ifdef CONFIG_COMPAT
837         {
838                 .ctl_name       = KERN_COMPAT_LOG,
839                 .procname       = "compat-log",
840                 .data           = &compat_log,
841                 .maxlen         = sizeof (int),
842                 .mode           = 0644,
843                 .proc_handler   = &proc_dointvec,
844         },
845 #endif
846 #ifdef CONFIG_RT_MUTEXES
847         {
848                 .ctl_name       = KERN_MAX_LOCK_DEPTH,
849                 .procname       = "max_lock_depth",
850                 .data           = &max_lock_depth,
851                 .maxlen         = sizeof(int),
852                 .mode           = 0644,
853                 .proc_handler   = &proc_dointvec,
854         },
855 #endif
856         {
857                 .ctl_name       = CTL_UNNUMBERED,
858                 .procname       = "poweroff_cmd",
859                 .data           = &poweroff_cmd,
860                 .maxlen         = POWEROFF_CMD_PATH_LEN,
861                 .mode           = 0644,
862                 .proc_handler   = &proc_dostring,
863                 .strategy       = &sysctl_string,
864         },
865 #ifdef CONFIG_KEYS
866         {
867                 .ctl_name       = CTL_UNNUMBERED,
868                 .procname       = "keys",
869                 .mode           = 0555,
870                 .child          = key_sysctls,
871         },
872 #endif
873 #ifdef CONFIG_RCU_TORTURE_TEST
874         {
875                 .ctl_name       = CTL_UNNUMBERED,
876                 .procname       = "rcutorture_runnable",
877                 .data           = &rcutorture_runnable,
878                 .maxlen         = sizeof(int),
879                 .mode           = 0644,
880                 .proc_handler   = &proc_dointvec,
881         },
882 #endif
883 #ifdef CONFIG_UNEVICTABLE_LRU
884         {
885                 .ctl_name       = CTL_UNNUMBERED,
886                 .procname       = "scan_unevictable_pages",
887                 .data           = &scan_unevictable_pages,
888                 .maxlen         = sizeof(scan_unevictable_pages),
889                 .mode           = 0644,
890                 .proc_handler   = &scan_unevictable_handler,
891         },
892 #endif
893 /*
894  * NOTE: do not add new entries to this table unless you have read
895  * Documentation/sysctl/ctl_unnumbered.txt
896  */
897         { .ctl_name = 0 }
898 };
899
900 static struct ctl_table vm_table[] = {
901         {
902                 .ctl_name       = VM_OVERCOMMIT_MEMORY,
903                 .procname       = "overcommit_memory",
904                 .data           = &sysctl_overcommit_memory,
905                 .maxlen         = sizeof(sysctl_overcommit_memory),
906                 .mode           = 0644,
907                 .proc_handler   = &proc_dointvec,
908         },
909         {
910                 .ctl_name       = VM_PANIC_ON_OOM,
911                 .procname       = "panic_on_oom",
912                 .data           = &sysctl_panic_on_oom,
913                 .maxlen         = sizeof(sysctl_panic_on_oom),
914                 .mode           = 0644,
915                 .proc_handler   = &proc_dointvec,
916         },
917         {
918                 .ctl_name       = CTL_UNNUMBERED,
919                 .procname       = "oom_kill_allocating_task",
920                 .data           = &sysctl_oom_kill_allocating_task,
921                 .maxlen         = sizeof(sysctl_oom_kill_allocating_task),
922                 .mode           = 0644,
923                 .proc_handler   = &proc_dointvec,
924         },
925         {
926                 .ctl_name       = CTL_UNNUMBERED,
927                 .procname       = "oom_dump_tasks",
928                 .data           = &sysctl_oom_dump_tasks,
929                 .maxlen         = sizeof(sysctl_oom_dump_tasks),
930                 .mode           = 0644,
931                 .proc_handler   = &proc_dointvec,
932         },
933         {
934                 .ctl_name       = VM_OVERCOMMIT_RATIO,
935                 .procname       = "overcommit_ratio",
936                 .data           = &sysctl_overcommit_ratio,
937                 .maxlen         = sizeof(sysctl_overcommit_ratio),
938                 .mode           = 0644,
939                 .proc_handler   = &proc_dointvec,
940         },
941         {
942                 .ctl_name       = VM_PAGE_CLUSTER,
943                 .procname       = "page-cluster", 
944                 .data           = &page_cluster,
945                 .maxlen         = sizeof(int),
946                 .mode           = 0644,
947                 .proc_handler   = &proc_dointvec,
948         },
949         {
950                 .ctl_name       = VM_DIRTY_BACKGROUND,
951                 .procname       = "dirty_background_ratio",
952                 .data           = &dirty_background_ratio,
953                 .maxlen         = sizeof(dirty_background_ratio),
954                 .mode           = 0644,
955                 .proc_handler   = &proc_dointvec_minmax,
956                 .strategy       = &sysctl_intvec,
957                 .extra1         = &zero,
958                 .extra2         = &one_hundred,
959         },
960         {
961                 .ctl_name       = VM_DIRTY_RATIO,
962                 .procname       = "dirty_ratio",
963                 .data           = &vm_dirty_ratio,
964                 .maxlen         = sizeof(vm_dirty_ratio),
965                 .mode           = 0644,
966                 .proc_handler   = &dirty_ratio_handler,
967                 .strategy       = &sysctl_intvec,
968                 .extra1         = &zero,
969                 .extra2         = &one_hundred,
970         },
971         {
972                 .procname       = "dirty_writeback_centisecs",
973                 .data           = &dirty_writeback_interval,
974                 .maxlen         = sizeof(dirty_writeback_interval),
975                 .mode           = 0644,
976                 .proc_handler   = &dirty_writeback_centisecs_handler,
977         },
978         {
979                 .procname       = "dirty_expire_centisecs",
980                 .data           = &dirty_expire_interval,
981                 .maxlen         = sizeof(dirty_expire_interval),
982                 .mode           = 0644,
983                 .proc_handler   = &proc_dointvec_userhz_jiffies,
984         },
985         {
986                 .ctl_name       = VM_NR_PDFLUSH_THREADS,
987                 .procname       = "nr_pdflush_threads",
988                 .data           = &nr_pdflush_threads,
989                 .maxlen         = sizeof nr_pdflush_threads,
990                 .mode           = 0444 /* read-only*/,
991                 .proc_handler   = &proc_dointvec,
992         },
993         {
994                 .ctl_name       = VM_SWAPPINESS,
995                 .procname       = "swappiness",
996                 .data           = &vm_swappiness,
997                 .maxlen         = sizeof(vm_swappiness),
998                 .mode           = 0644,
999                 .proc_handler   = &proc_dointvec_minmax,
1000                 .strategy       = &sysctl_intvec,
1001                 .extra1         = &zero,
1002                 .extra2         = &one_hundred,
1003         },
1004 #ifdef CONFIG_HUGETLB_PAGE
1005          {
1006                 .procname       = "nr_hugepages",
1007                 .data           = NULL,
1008                 .maxlen         = sizeof(unsigned long),
1009                 .mode           = 0644,
1010                 .proc_handler   = &hugetlb_sysctl_handler,
1011                 .extra1         = (void *)&hugetlb_zero,
1012                 .extra2         = (void *)&hugetlb_infinity,
1013          },
1014          {
1015                 .ctl_name       = VM_HUGETLB_GROUP,
1016                 .procname       = "hugetlb_shm_group",
1017                 .data           = &sysctl_hugetlb_shm_group,
1018                 .maxlen         = sizeof(gid_t),
1019                 .mode           = 0644,
1020                 .proc_handler   = &proc_dointvec,
1021          },
1022          {
1023                 .ctl_name       = CTL_UNNUMBERED,
1024                 .procname       = "hugepages_treat_as_movable",
1025                 .data           = &hugepages_treat_as_movable,
1026                 .maxlen         = sizeof(int),
1027                 .mode           = 0644,
1028                 .proc_handler   = &hugetlb_treat_movable_handler,
1029         },
1030         {
1031                 .ctl_name       = CTL_UNNUMBERED,
1032                 .procname       = "nr_overcommit_hugepages",
1033                 .data           = NULL,
1034                 .maxlen         = sizeof(unsigned long),
1035                 .mode           = 0644,
1036                 .proc_handler   = &hugetlb_overcommit_handler,
1037                 .extra1         = (void *)&hugetlb_zero,
1038                 .extra2         = (void *)&hugetlb_infinity,
1039         },
1040 #endif
1041         {
1042                 .ctl_name       = VM_LOWMEM_RESERVE_RATIO,
1043                 .procname       = "lowmem_reserve_ratio",
1044                 .data           = &sysctl_lowmem_reserve_ratio,
1045                 .maxlen         = sizeof(sysctl_lowmem_reserve_ratio),
1046                 .mode           = 0644,
1047                 .proc_handler   = &lowmem_reserve_ratio_sysctl_handler,
1048                 .strategy       = &sysctl_intvec,
1049         },
1050         {
1051                 .ctl_name       = VM_DROP_PAGECACHE,
1052                 .procname       = "drop_caches",
1053                 .data           = &sysctl_drop_caches,
1054                 .maxlen         = sizeof(int),
1055                 .mode           = 0644,
1056                 .proc_handler   = drop_caches_sysctl_handler,
1057                 .strategy       = &sysctl_intvec,
1058         },
1059         {
1060                 .ctl_name       = VM_MIN_FREE_KBYTES,
1061                 .procname       = "min_free_kbytes",
1062                 .data           = &min_free_kbytes,
1063                 .maxlen         = sizeof(min_free_kbytes),
1064                 .mode           = 0644,
1065                 .proc_handler   = &min_free_kbytes_sysctl_handler,
1066                 .strategy       = &sysctl_intvec,
1067                 .extra1         = &zero,
1068         },
1069         {
1070                 .ctl_name       = VM_PERCPU_PAGELIST_FRACTION,
1071                 .procname       = "percpu_pagelist_fraction",
1072                 .data           = &percpu_pagelist_fraction,
1073                 .maxlen         = sizeof(percpu_pagelist_fraction),
1074                 .mode           = 0644,
1075                 .proc_handler   = &percpu_pagelist_fraction_sysctl_handler,
1076                 .strategy       = &sysctl_intvec,
1077                 .extra1         = &min_percpu_pagelist_fract,
1078         },
1079 #ifdef CONFIG_MMU
1080         {
1081                 .ctl_name       = VM_MAX_MAP_COUNT,
1082                 .procname       = "max_map_count",
1083                 .data           = &sysctl_max_map_count,
1084                 .maxlen         = sizeof(sysctl_max_map_count),
1085                 .mode           = 0644,
1086                 .proc_handler   = &proc_dointvec
1087         },
1088 #endif
1089         {
1090                 .ctl_name       = VM_LAPTOP_MODE,
1091                 .procname       = "laptop_mode",
1092                 .data           = &laptop_mode,
1093                 .maxlen         = sizeof(laptop_mode),
1094                 .mode           = 0644,
1095                 .proc_handler   = &proc_dointvec_jiffies,
1096                 .strategy       = &sysctl_jiffies,
1097         },
1098         {
1099                 .ctl_name       = VM_BLOCK_DUMP,
1100                 .procname       = "block_dump",
1101                 .data           = &block_dump,
1102                 .maxlen         = sizeof(block_dump),
1103                 .mode           = 0644,
1104                 .proc_handler   = &proc_dointvec,
1105                 .strategy       = &sysctl_intvec,
1106                 .extra1         = &zero,
1107         },
1108         {
1109                 .ctl_name       = VM_VFS_CACHE_PRESSURE,
1110                 .procname       = "vfs_cache_pressure",
1111                 .data           = &sysctl_vfs_cache_pressure,
1112                 .maxlen         = sizeof(sysctl_vfs_cache_pressure),
1113                 .mode           = 0644,
1114                 .proc_handler   = &proc_dointvec,
1115                 .strategy       = &sysctl_intvec,
1116                 .extra1         = &zero,
1117         },
1118 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1119         {
1120                 .ctl_name       = VM_LEGACY_VA_LAYOUT,
1121                 .procname       = "legacy_va_layout",
1122                 .data           = &sysctl_legacy_va_layout,
1123                 .maxlen         = sizeof(sysctl_legacy_va_layout),
1124                 .mode           = 0644,
1125                 .proc_handler   = &proc_dointvec,
1126                 .strategy       = &sysctl_intvec,
1127                 .extra1         = &zero,
1128         },
1129 #endif
1130 #ifdef CONFIG_NUMA
1131         {
1132                 .ctl_name       = VM_ZONE_RECLAIM_MODE,
1133                 .procname       = "zone_reclaim_mode",
1134                 .data           = &zone_reclaim_mode,
1135                 .maxlen         = sizeof(zone_reclaim_mode),
1136                 .mode           = 0644,
1137                 .proc_handler   = &proc_dointvec,
1138                 .strategy       = &sysctl_intvec,
1139                 .extra1         = &zero,
1140         },
1141         {
1142                 .ctl_name       = VM_MIN_UNMAPPED,
1143                 .procname       = "min_unmapped_ratio",
1144                 .data           = &sysctl_min_unmapped_ratio,
1145                 .maxlen         = sizeof(sysctl_min_unmapped_ratio),
1146                 .mode           = 0644,
1147                 .proc_handler   = &sysctl_min_unmapped_ratio_sysctl_handler,
1148                 .strategy       = &sysctl_intvec,
1149                 .extra1         = &zero,
1150                 .extra2         = &one_hundred,
1151         },
1152         {
1153                 .ctl_name       = VM_MIN_SLAB,
1154                 .procname       = "min_slab_ratio",
1155                 .data           = &sysctl_min_slab_ratio,
1156                 .maxlen         = sizeof(sysctl_min_slab_ratio),
1157                 .mode           = 0644,
1158                 .proc_handler   = &sysctl_min_slab_ratio_sysctl_handler,
1159                 .strategy       = &sysctl_intvec,
1160                 .extra1         = &zero,
1161                 .extra2         = &one_hundred,
1162         },
1163 #endif
1164 #ifdef CONFIG_SMP
1165         {
1166                 .ctl_name       = CTL_UNNUMBERED,
1167                 .procname       = "stat_interval",
1168                 .data           = &sysctl_stat_interval,
1169                 .maxlen         = sizeof(sysctl_stat_interval),
1170                 .mode           = 0644,
1171                 .proc_handler   = &proc_dointvec_jiffies,
1172                 .strategy       = &sysctl_jiffies,
1173         },
1174 #endif
1175 #ifdef CONFIG_SECURITY
1176         {
1177                 .ctl_name       = CTL_UNNUMBERED,
1178                 .procname       = "mmap_min_addr",
1179                 .data           = &mmap_min_addr,
1180                 .maxlen         = sizeof(unsigned long),
1181                 .mode           = 0644,
1182                 .proc_handler   = &proc_doulongvec_minmax,
1183         },
1184 #endif
1185 #ifdef CONFIG_NUMA
1186         {
1187                 .ctl_name       = CTL_UNNUMBERED,
1188                 .procname       = "numa_zonelist_order",
1189                 .data           = &numa_zonelist_order,
1190                 .maxlen         = NUMA_ZONELIST_ORDER_LEN,
1191                 .mode           = 0644,
1192                 .proc_handler   = &numa_zonelist_order_handler,
1193                 .strategy       = &sysctl_string,
1194         },
1195 #endif
1196 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1197    (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1198         {
1199                 .ctl_name       = VM_VDSO_ENABLED,
1200                 .procname       = "vdso_enabled",
1201                 .data           = &vdso_enabled,
1202                 .maxlen         = sizeof(vdso_enabled),
1203                 .mode           = 0644,
1204                 .proc_handler   = &proc_dointvec,
1205                 .strategy       = &sysctl_intvec,
1206                 .extra1         = &zero,
1207         },
1208 #endif
1209 #ifdef CONFIG_HIGHMEM
1210         {
1211                 .ctl_name       = CTL_UNNUMBERED,
1212                 .procname       = "highmem_is_dirtyable",
1213                 .data           = &vm_highmem_is_dirtyable,
1214                 .maxlen         = sizeof(vm_highmem_is_dirtyable),
1215                 .mode           = 0644,
1216                 .proc_handler   = &proc_dointvec_minmax,
1217                 .strategy       = &sysctl_intvec,
1218                 .extra1         = &zero,
1219                 .extra2         = &one,
1220         },
1221 #endif
1222 /*
1223  * NOTE: do not add new entries to this table unless you have read
1224  * Documentation/sysctl/ctl_unnumbered.txt
1225  */
1226         { .ctl_name = 0 }
1227 };
1228
1229 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1230 static struct ctl_table binfmt_misc_table[] = {
1231         { .ctl_name = 0 }
1232 };
1233 #endif
1234
1235 static struct ctl_table fs_table[] = {
1236         {
1237                 .ctl_name       = FS_NRINODE,
1238                 .procname       = "inode-nr",
1239                 .data           = &inodes_stat,
1240                 .maxlen         = 2*sizeof(int),
1241                 .mode           = 0444,
1242                 .proc_handler   = &proc_dointvec,
1243         },
1244         {
1245                 .ctl_name       = FS_STATINODE,
1246                 .procname       = "inode-state",
1247                 .data           = &inodes_stat,
1248                 .maxlen         = 7*sizeof(int),
1249                 .mode           = 0444,
1250                 .proc_handler   = &proc_dointvec,
1251         },
1252         {
1253                 .procname       = "file-nr",
1254                 .data           = &files_stat,
1255                 .maxlen         = 3*sizeof(int),
1256                 .mode           = 0444,
1257                 .proc_handler   = &proc_nr_files,
1258         },
1259         {
1260                 .ctl_name       = FS_MAXFILE,
1261                 .procname       = "file-max",
1262                 .data           = &files_stat.max_files,
1263                 .maxlen         = sizeof(int),
1264                 .mode           = 0644,
1265                 .proc_handler   = &proc_dointvec,
1266         },
1267         {
1268                 .ctl_name       = CTL_UNNUMBERED,
1269                 .procname       = "nr_open",
1270                 .data           = &sysctl_nr_open,
1271                 .maxlen         = sizeof(int),
1272                 .mode           = 0644,
1273                 .proc_handler   = &proc_dointvec_minmax,
1274                 .extra1         = &sysctl_nr_open_min,
1275                 .extra2         = &sysctl_nr_open_max,
1276         },
1277         {
1278                 .ctl_name       = FS_DENTRY,
1279                 .procname       = "dentry-state",
1280                 .data           = &dentry_stat,
1281                 .maxlen         = 6*sizeof(int),
1282                 .mode           = 0444,
1283                 .proc_handler   = &proc_dointvec,
1284         },
1285         {
1286                 .ctl_name       = FS_OVERFLOWUID,
1287                 .procname       = "overflowuid",
1288                 .data           = &fs_overflowuid,
1289                 .maxlen         = sizeof(int),
1290                 .mode           = 0644,
1291                 .proc_handler   = &proc_dointvec_minmax,
1292                 .strategy       = &sysctl_intvec,
1293                 .extra1         = &minolduid,
1294                 .extra2         = &maxolduid,
1295         },
1296         {
1297                 .ctl_name       = FS_OVERFLOWGID,
1298                 .procname       = "overflowgid",
1299                 .data           = &fs_overflowgid,
1300                 .maxlen         = sizeof(int),
1301                 .mode           = 0644,
1302                 .proc_handler   = &proc_dointvec_minmax,
1303                 .strategy       = &sysctl_intvec,
1304                 .extra1         = &minolduid,
1305                 .extra2         = &maxolduid,
1306         },
1307 #ifdef CONFIG_FILE_LOCKING
1308         {
1309                 .ctl_name       = FS_LEASES,
1310                 .procname       = "leases-enable",
1311                 .data           = &leases_enable,
1312                 .maxlen         = sizeof(int),
1313                 .mode           = 0644,
1314                 .proc_handler   = &proc_dointvec,
1315         },
1316 #endif
1317 #ifdef CONFIG_DNOTIFY
1318         {
1319                 .ctl_name       = FS_DIR_NOTIFY,
1320                 .procname       = "dir-notify-enable",
1321                 .data           = &dir_notify_enable,
1322                 .maxlen         = sizeof(int),
1323                 .mode           = 0644,
1324                 .proc_handler   = &proc_dointvec,
1325         },
1326 #endif
1327 #ifdef CONFIG_MMU
1328 #ifdef CONFIG_FILE_LOCKING
1329         {
1330                 .ctl_name       = FS_LEASE_TIME,
1331                 .procname       = "lease-break-time",
1332                 .data           = &lease_break_time,
1333                 .maxlen         = sizeof(int),
1334                 .mode           = 0644,
1335                 .proc_handler   = &proc_dointvec_minmax,
1336                 .strategy       = &sysctl_intvec,
1337                 .extra1         = &zero,
1338                 .extra2         = &two,
1339         },
1340 #endif
1341 #ifdef CONFIG_AIO
1342         {
1343                 .procname       = "aio-nr",
1344                 .data           = &aio_nr,
1345                 .maxlen         = sizeof(aio_nr),
1346                 .mode           = 0444,
1347                 .proc_handler   = &proc_doulongvec_minmax,
1348         },
1349         {
1350                 .procname       = "aio-max-nr",
1351                 .data           = &aio_max_nr,
1352                 .maxlen         = sizeof(aio_max_nr),
1353                 .mode           = 0644,
1354                 .proc_handler   = &proc_doulongvec_minmax,
1355         },
1356 #endif /* CONFIG_AIO */
1357 #ifdef CONFIG_INOTIFY_USER
1358         {
1359                 .ctl_name       = FS_INOTIFY,
1360                 .procname       = "inotify",
1361                 .mode           = 0555,
1362                 .child          = inotify_table,
1363         },
1364 #endif  
1365 #ifdef CONFIG_EPOLL
1366         {
1367                 .procname       = "epoll",
1368                 .mode           = 0555,
1369                 .child          = epoll_table,
1370         },
1371 #endif
1372 #endif
1373         {
1374                 .ctl_name       = KERN_SETUID_DUMPABLE,
1375                 .procname       = "suid_dumpable",
1376                 .data           = &suid_dumpable,
1377                 .maxlen         = sizeof(int),
1378                 .mode           = 0644,
1379                 .proc_handler   = &proc_dointvec,
1380         },
1381 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1382         {
1383                 .ctl_name       = CTL_UNNUMBERED,
1384                 .procname       = "binfmt_misc",
1385                 .mode           = 0555,
1386                 .child          = binfmt_misc_table,
1387         },
1388 #endif
1389 /*
1390  * NOTE: do not add new entries to this table unless you have read
1391  * Documentation/sysctl/ctl_unnumbered.txt
1392  */
1393         { .ctl_name = 0 }
1394 };
1395
1396 static struct ctl_table debug_table[] = {
1397 #if defined(CONFIG_X86) || defined(CONFIG_PPC)
1398         {
1399                 .ctl_name       = CTL_UNNUMBERED,
1400                 .procname       = "exception-trace",
1401                 .data           = &show_unhandled_signals,
1402                 .maxlen         = sizeof(int),
1403                 .mode           = 0644,
1404                 .proc_handler   = proc_dointvec
1405         },
1406 #endif
1407         { .ctl_name = 0 }
1408 };
1409
1410 static struct ctl_table dev_table[] = {
1411         { .ctl_name = 0 }
1412 };
1413
1414 static DEFINE_SPINLOCK(sysctl_lock);
1415
1416 /* called under sysctl_lock */
1417 static int use_table(struct ctl_table_header *p)
1418 {
1419         if (unlikely(p->unregistering))
1420                 return 0;
1421         p->used++;
1422         return 1;
1423 }
1424
1425 /* called under sysctl_lock */
1426 static void unuse_table(struct ctl_table_header *p)
1427 {
1428         if (!--p->used)
1429                 if (unlikely(p->unregistering))
1430                         complete(p->unregistering);
1431 }
1432
1433 /* called under sysctl_lock, will reacquire if has to wait */
1434 static void start_unregistering(struct ctl_table_header *p)
1435 {
1436         /*
1437          * if p->used is 0, nobody will ever touch that entry again;
1438          * we'll eliminate all paths to it before dropping sysctl_lock
1439          */
1440         if (unlikely(p->used)) {
1441                 struct completion wait;
1442                 init_completion(&wait);
1443                 p->unregistering = &wait;
1444                 spin_unlock(&sysctl_lock);
1445                 wait_for_completion(&wait);
1446                 spin_lock(&sysctl_lock);
1447         } else {
1448                 /* anything non-NULL; we'll never dereference it */
1449                 p->unregistering = ERR_PTR(-EINVAL);
1450         }
1451         /*
1452          * do not remove from the list until nobody holds it; walking the
1453          * list in do_sysctl() relies on that.
1454          */
1455         list_del_init(&p->ctl_entry);
1456 }
1457
1458 void sysctl_head_get(struct ctl_table_header *head)
1459 {
1460         spin_lock(&sysctl_lock);
1461         head->count++;
1462         spin_unlock(&sysctl_lock);
1463 }
1464
1465 void sysctl_head_put(struct ctl_table_header *head)
1466 {
1467         spin_lock(&sysctl_lock);
1468         if (!--head->count)
1469                 kfree(head);
1470         spin_unlock(&sysctl_lock);
1471 }
1472
1473 struct ctl_table_header *sysctl_head_grab(struct ctl_table_header *head)
1474 {
1475         if (!head)
1476                 BUG();
1477         spin_lock(&sysctl_lock);
1478         if (!use_table(head))
1479                 head = ERR_PTR(-ENOENT);
1480         spin_unlock(&sysctl_lock);
1481         return head;
1482 }
1483
1484 void sysctl_head_finish(struct ctl_table_header *head)
1485 {
1486         if (!head)
1487                 return;
1488         spin_lock(&sysctl_lock);
1489         unuse_table(head);
1490         spin_unlock(&sysctl_lock);
1491 }
1492
1493 static struct ctl_table_set *
1494 lookup_header_set(struct ctl_table_root *root, struct nsproxy *namespaces)
1495 {
1496         struct ctl_table_set *set = &root->default_set;
1497         if (root->lookup)
1498                 set = root->lookup(root, namespaces);
1499         return set;
1500 }
1501
1502 static struct list_head *
1503 lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces)
1504 {
1505         struct ctl_table_set *set = lookup_header_set(root, namespaces);
1506         return &set->list;
1507 }
1508
1509 struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces,
1510                                             struct ctl_table_header *prev)
1511 {
1512         struct ctl_table_root *root;
1513         struct list_head *header_list;
1514         struct ctl_table_header *head;
1515         struct list_head *tmp;
1516
1517         spin_lock(&sysctl_lock);
1518         if (prev) {
1519                 head = prev;
1520                 tmp = &prev->ctl_entry;
1521                 unuse_table(prev);
1522                 goto next;
1523         }
1524         tmp = &root_table_header.ctl_entry;
1525         for (;;) {
1526                 head = list_entry(tmp, struct ctl_table_header, ctl_entry);
1527
1528                 if (!use_table(head))
1529                         goto next;
1530                 spin_unlock(&sysctl_lock);
1531                 return head;
1532         next:
1533                 root = head->root;
1534                 tmp = tmp->next;
1535                 header_list = lookup_header_list(root, namespaces);
1536                 if (tmp != header_list)
1537                         continue;
1538
1539                 do {
1540                         root = list_entry(root->root_list.next,
1541                                         struct ctl_table_root, root_list);
1542                         if (root == &sysctl_table_root)
1543                                 goto out;
1544                         header_list = lookup_header_list(root, namespaces);
1545                 } while (list_empty(header_list));
1546                 tmp = header_list->next;
1547         }
1548 out:
1549         spin_unlock(&sysctl_lock);
1550         return NULL;
1551 }
1552
1553 struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev)
1554 {
1555         return __sysctl_head_next(current->nsproxy, prev);
1556 }
1557
1558 void register_sysctl_root(struct ctl_table_root *root)
1559 {
1560         spin_lock(&sysctl_lock);
1561         list_add_tail(&root->root_list, &sysctl_table_root.root_list);
1562         spin_unlock(&sysctl_lock);
1563 }
1564
1565 #ifdef CONFIG_SYSCTL_SYSCALL
1566 /* Perform the actual read/write of a sysctl table entry. */
1567 static int do_sysctl_strategy(struct ctl_table_root *root,
1568                         struct ctl_table *table,
1569                         void __user *oldval, size_t __user *oldlenp,
1570                         void __user *newval, size_t newlen)
1571 {
1572         int op = 0, rc;
1573
1574         if (oldval)
1575                 op |= MAY_READ;
1576         if (newval)
1577                 op |= MAY_WRITE;
1578         if (sysctl_perm(root, table, op))
1579                 return -EPERM;
1580
1581         if (table->strategy) {
1582                 rc = table->strategy(table, oldval, oldlenp, newval, newlen);
1583                 if (rc < 0)
1584                         return rc;
1585                 if (rc > 0)
1586                         return 0;
1587         }
1588
1589         /* If there is no strategy routine, or if the strategy returns
1590          * zero, proceed with automatic r/w */
1591         if (table->data && table->maxlen) {
1592                 rc = sysctl_data(table, oldval, oldlenp, newval, newlen);
1593                 if (rc < 0)
1594                         return rc;
1595         }
1596         return 0;
1597 }
1598
1599 static int parse_table(int __user *name, int nlen,
1600                        void __user *oldval, size_t __user *oldlenp,
1601                        void __user *newval, size_t newlen,
1602                        struct ctl_table_root *root,
1603                        struct ctl_table *table)
1604 {
1605         int n;
1606 repeat:
1607         if (!nlen)
1608                 return -ENOTDIR;
1609         if (get_user(n, name))
1610                 return -EFAULT;
1611         for ( ; table->ctl_name || table->procname; table++) {
1612                 if (!table->ctl_name)
1613                         continue;
1614                 if (n == table->ctl_name) {
1615                         int error;
1616                         if (table->child) {
1617                                 if (sysctl_perm(root, table, MAY_EXEC))
1618                                         return -EPERM;
1619                                 name++;
1620                                 nlen--;
1621                                 table = table->child;
1622                                 goto repeat;
1623                         }
1624                         error = do_sysctl_strategy(root, table,
1625                                                    oldval, oldlenp,
1626                                                    newval, newlen);
1627                         return error;
1628                 }
1629         }
1630         return -ENOTDIR;
1631 }
1632
1633 int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp,
1634                void __user *newval, size_t newlen)
1635 {
1636         struct ctl_table_header *head;
1637         int error = -ENOTDIR;
1638
1639         if (nlen <= 0 || nlen >= CTL_MAXNAME)
1640                 return -ENOTDIR;
1641         if (oldval) {
1642                 int old_len;
1643                 if (!oldlenp || get_user(old_len, oldlenp))
1644                         return -EFAULT;
1645         }
1646
1647         for (head = sysctl_head_next(NULL); head;
1648                         head = sysctl_head_next(head)) {
1649                 error = parse_table(name, nlen, oldval, oldlenp, 
1650                                         newval, newlen,
1651                                         head->root, head->ctl_table);
1652                 if (error != -ENOTDIR) {
1653                         sysctl_head_finish(head);
1654                         break;
1655                 }
1656         }
1657         return error;
1658 }
1659
1660 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
1661 {
1662         struct __sysctl_args tmp;
1663         int error;
1664
1665         if (copy_from_user(&tmp, args, sizeof(tmp)))
1666                 return -EFAULT;
1667
1668         error = deprecated_sysctl_warning(&tmp);
1669         if (error)
1670                 goto out;
1671
1672         lock_kernel();
1673         error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp,
1674                           tmp.newval, tmp.newlen);
1675         unlock_kernel();
1676 out:
1677         return error;
1678 }
1679 #endif /* CONFIG_SYSCTL_SYSCALL */
1680
1681 /*
1682  * sysctl_perm does NOT grant the superuser all rights automatically, because
1683  * some sysctl variables are readonly even to root.
1684  */
1685
1686 static int test_perm(int mode, int op)
1687 {
1688         if (!current_euid())
1689                 mode >>= 6;
1690         else if (in_egroup_p(0))
1691                 mode >>= 3;
1692         if ((op & ~mode & (MAY_READ|MAY_WRITE|MAY_EXEC)) == 0)
1693                 return 0;
1694         return -EACCES;
1695 }
1696
1697 int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op)
1698 {
1699         int error;
1700         int mode;
1701
1702         error = security_sysctl(table, op & (MAY_READ | MAY_WRITE | MAY_EXEC));
1703         if (error)
1704                 return error;
1705
1706         if (root->permissions)
1707                 mode = root->permissions(root, current->nsproxy, table);
1708         else
1709                 mode = table->mode;
1710
1711         return test_perm(mode, op);
1712 }
1713
1714 static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table)
1715 {
1716         for (; table->ctl_name || table->procname; table++) {
1717                 table->parent = parent;
1718                 if (table->child)
1719                         sysctl_set_parent(table, table->child);
1720         }
1721 }
1722
1723 static __init int sysctl_init(void)
1724 {
1725         sysctl_set_parent(NULL, root_table);
1726 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1727         {
1728                 int err;
1729                 err = sysctl_check_table(current->nsproxy, root_table);
1730         }
1731 #endif
1732         return 0;
1733 }
1734
1735 core_initcall(sysctl_init);
1736
1737 static struct ctl_table *is_branch_in(struct ctl_table *branch,
1738                                       struct ctl_table *table)
1739 {
1740         struct ctl_table *p;
1741         const char *s = branch->procname;
1742
1743         /* branch should have named subdirectory as its first element */
1744         if (!s || !branch->child)
1745                 return NULL;
1746
1747         /* ... and nothing else */
1748         if (branch[1].procname || branch[1].ctl_name)
1749                 return NULL;
1750
1751         /* table should contain subdirectory with the same name */
1752         for (p = table; p->procname || p->ctl_name; p++) {
1753                 if (!p->child)
1754                         continue;
1755                 if (p->procname && strcmp(p->procname, s) == 0)
1756                         return p;
1757         }
1758         return NULL;
1759 }
1760
1761 /* see if attaching q to p would be an improvement */
1762 static void try_attach(struct ctl_table_header *p, struct ctl_table_header *q)
1763 {
1764         struct ctl_table *to = p->ctl_table, *by = q->ctl_table;
1765         struct ctl_table *next;
1766         int is_better = 0;
1767         int not_in_parent = !p->attached_by;
1768
1769         while ((next = is_branch_in(by, to)) != NULL) {
1770                 if (by == q->attached_by)
1771                         is_better = 1;
1772                 if (to == p->attached_by)
1773                         not_in_parent = 1;
1774                 by = by->child;
1775                 to = next->child;
1776         }
1777
1778         if (is_better && not_in_parent) {
1779                 q->attached_by = by;
1780                 q->attached_to = to;
1781                 q->parent = p;
1782         }
1783 }
1784
1785 /**
1786  * __register_sysctl_paths - register a sysctl hierarchy
1787  * @root: List of sysctl headers to register on
1788  * @namespaces: Data to compute which lists of sysctl entries are visible
1789  * @path: The path to the directory the sysctl table is in.
1790  * @table: the top-level table structure
1791  *
1792  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1793  * array. A completely 0 filled entry terminates the table.
1794  *
1795  * The members of the &struct ctl_table structure are used as follows:
1796  *
1797  * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1798  *            must be unique within that level of sysctl
1799  *
1800  * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1801  *            enter a sysctl file
1802  *
1803  * data - a pointer to data for use by proc_handler
1804  *
1805  * maxlen - the maximum size in bytes of the data
1806  *
1807  * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1808  *
1809  * child - a pointer to the child sysctl table if this entry is a directory, or
1810  *         %NULL.
1811  *
1812  * proc_handler - the text handler routine (described below)
1813  *
1814  * strategy - the strategy routine (described below)
1815  *
1816  * de - for internal use by the sysctl routines
1817  *
1818  * extra1, extra2 - extra pointers usable by the proc handler routines
1819  *
1820  * Leaf nodes in the sysctl tree will be represented by a single file
1821  * under /proc; non-leaf nodes will be represented by directories.
1822  *
1823  * sysctl(2) can automatically manage read and write requests through
1824  * the sysctl table.  The data and maxlen fields of the ctl_table
1825  * struct enable minimal validation of the values being written to be
1826  * performed, and the mode field allows minimal authentication.
1827  *
1828  * More sophisticated management can be enabled by the provision of a
1829  * strategy routine with the table entry.  This will be called before
1830  * any automatic read or write of the data is performed.
1831  *
1832  * The strategy routine may return
1833  *
1834  * < 0 - Error occurred (error is passed to user process)
1835  *
1836  * 0   - OK - proceed with automatic read or write.
1837  *
1838  * > 0 - OK - read or write has been done by the strategy routine, so
1839  *       return immediately.
1840  *
1841  * There must be a proc_handler routine for any terminal nodes
1842  * mirrored under /proc/sys (non-terminals are handled by a built-in
1843  * directory handler).  Several default handlers are available to
1844  * cover common cases -
1845  *
1846  * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1847  * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(), 
1848  * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1849  *
1850  * It is the handler's job to read the input buffer from user memory
1851  * and process it. The handler should return 0 on success.
1852  *
1853  * This routine returns %NULL on a failure to register, and a pointer
1854  * to the table header on success.
1855  */
1856 struct ctl_table_header *__register_sysctl_paths(
1857         struct ctl_table_root *root,
1858         struct nsproxy *namespaces,
1859         const struct ctl_path *path, struct ctl_table *table)
1860 {
1861         struct ctl_table_header *header;
1862         struct ctl_table *new, **prevp;
1863         unsigned int n, npath;
1864         struct ctl_table_set *set;
1865
1866         /* Count the path components */
1867         for (npath = 0; path[npath].ctl_name || path[npath].procname; ++npath)
1868                 ;
1869
1870         /*
1871          * For each path component, allocate a 2-element ctl_table array.
1872          * The first array element will be filled with the sysctl entry
1873          * for this, the second will be the sentinel (ctl_name == 0).
1874          *
1875          * We allocate everything in one go so that we don't have to
1876          * worry about freeing additional memory in unregister_sysctl_table.
1877          */
1878         header = kzalloc(sizeof(struct ctl_table_header) +
1879                          (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL);
1880         if (!header)
1881                 return NULL;
1882
1883         new = (struct ctl_table *) (header + 1);
1884
1885         /* Now connect the dots */
1886         prevp = &header->ctl_table;
1887         for (n = 0; n < npath; ++n, ++path) {
1888                 /* Copy the procname */
1889                 new->procname = path->procname;
1890                 new->ctl_name = path->ctl_name;
1891                 new->mode     = 0555;
1892
1893                 *prevp = new;
1894                 prevp = &new->child;
1895
1896                 new += 2;
1897         }
1898         *prevp = table;
1899         header->ctl_table_arg = table;
1900
1901         INIT_LIST_HEAD(&header->ctl_entry);
1902         header->used = 0;
1903         header->unregistering = NULL;
1904         header->root = root;
1905         sysctl_set_parent(NULL, header->ctl_table);
1906         header->count = 1;
1907 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1908         if (sysctl_check_table(namespaces, header->ctl_table)) {
1909                 kfree(header);
1910                 return NULL;
1911         }
1912 #endif
1913         spin_lock(&sysctl_lock);
1914         header->set = lookup_header_set(root, namespaces);
1915         header->attached_by = header->ctl_table;
1916         header->attached_to = root_table;
1917         header->parent = &root_table_header;
1918         for (set = header->set; set; set = set->parent) {
1919                 struct ctl_table_header *p;
1920                 list_for_each_entry(p, &set->list, ctl_entry) {
1921                         if (p->unregistering)
1922                                 continue;
1923                         try_attach(p, header);
1924                 }
1925         }
1926         header->parent->count++;
1927         list_add_tail(&header->ctl_entry, &header->set->list);
1928         spin_unlock(&sysctl_lock);
1929
1930         return header;
1931 }
1932
1933 /**
1934  * register_sysctl_table_path - register a sysctl table hierarchy
1935  * @path: The path to the directory the sysctl table is in.
1936  * @table: the top-level table structure
1937  *
1938  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1939  * array. A completely 0 filled entry terminates the table.
1940  *
1941  * See __register_sysctl_paths for more details.
1942  */
1943 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1944                                                 struct ctl_table *table)
1945 {
1946         return __register_sysctl_paths(&sysctl_table_root, current->nsproxy,
1947                                         path, table);
1948 }
1949
1950 /**
1951  * register_sysctl_table - register a sysctl table hierarchy
1952  * @table: the top-level table structure
1953  *
1954  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1955  * array. A completely 0 filled entry terminates the table.
1956  *
1957  * See register_sysctl_paths for more details.
1958  */
1959 struct ctl_table_header *register_sysctl_table(struct ctl_table *table)
1960 {
1961         static const struct ctl_path null_path[] = { {} };
1962
1963         return register_sysctl_paths(null_path, table);
1964 }
1965
1966 /**
1967  * unregister_sysctl_table - unregister a sysctl table hierarchy
1968  * @header: the header returned from register_sysctl_table
1969  *
1970  * Unregisters the sysctl table and all children. proc entries may not
1971  * actually be removed until they are no longer used by anyone.
1972  */
1973 void unregister_sysctl_table(struct ctl_table_header * header)
1974 {
1975         might_sleep();
1976
1977         if (header == NULL)
1978                 return;
1979
1980         spin_lock(&sysctl_lock);
1981         start_unregistering(header);
1982         if (!--header->parent->count) {
1983                 WARN_ON(1);
1984                 kfree(header->parent);
1985         }
1986         if (!--header->count)
1987                 kfree(header);
1988         spin_unlock(&sysctl_lock);
1989 }
1990
1991 int sysctl_is_seen(struct ctl_table_header *p)
1992 {
1993         struct ctl_table_set *set = p->set;
1994         int res;
1995         spin_lock(&sysctl_lock);
1996         if (p->unregistering)
1997                 res = 0;
1998         else if (!set->is_seen)
1999                 res = 1;
2000         else
2001                 res = set->is_seen(set);
2002         spin_unlock(&sysctl_lock);
2003         return res;
2004 }
2005
2006 void setup_sysctl_set(struct ctl_table_set *p,
2007         struct ctl_table_set *parent,
2008         int (*is_seen)(struct ctl_table_set *))
2009 {
2010         INIT_LIST_HEAD(&p->list);
2011         p->parent = parent ? parent : &sysctl_table_root.default_set;
2012         p->is_seen = is_seen;
2013 }
2014
2015 #else /* !CONFIG_SYSCTL */
2016 struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
2017 {
2018         return NULL;
2019 }
2020
2021 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
2022                                                     struct ctl_table *table)
2023 {
2024         return NULL;
2025 }
2026
2027 void unregister_sysctl_table(struct ctl_table_header * table)
2028 {
2029 }
2030
2031 void setup_sysctl_set(struct ctl_table_set *p,
2032         struct ctl_table_set *parent,
2033         int (*is_seen)(struct ctl_table_set *))
2034 {
2035 }
2036
2037 void sysctl_head_put(struct ctl_table_header *head)
2038 {
2039 }
2040
2041 #endif /* CONFIG_SYSCTL */
2042
2043 /*
2044  * /proc/sys support
2045  */
2046
2047 #ifdef CONFIG_PROC_SYSCTL
2048
2049 static int _proc_do_string(void* data, int maxlen, int write,
2050                            struct file *filp, void __user *buffer,
2051                            size_t *lenp, loff_t *ppos)
2052 {
2053         size_t len;
2054         char __user *p;
2055         char c;
2056
2057         if (!data || !maxlen || !*lenp) {
2058                 *lenp = 0;
2059                 return 0;
2060         }
2061
2062         if (write) {
2063                 len = 0;
2064                 p = buffer;
2065                 while (len < *lenp) {
2066                         if (get_user(c, p++))
2067                                 return -EFAULT;
2068                         if (c == 0 || c == '\n')
2069                                 break;
2070                         len++;
2071                 }
2072                 if (len >= maxlen)
2073                         len = maxlen-1;
2074                 if(copy_from_user(data, buffer, len))
2075                         return -EFAULT;
2076                 ((char *) data)[len] = 0;
2077                 *ppos += *lenp;
2078         } else {
2079                 len = strlen(data);
2080                 if (len > maxlen)
2081                         len = maxlen;
2082
2083                 if (*ppos > len) {
2084                         *lenp = 0;
2085                         return 0;
2086                 }
2087
2088                 data += *ppos;
2089                 len  -= *ppos;
2090
2091                 if (len > *lenp)
2092                         len = *lenp;
2093                 if (len)
2094                         if(copy_to_user(buffer, data, len))
2095                                 return -EFAULT;
2096                 if (len < *lenp) {
2097                         if(put_user('\n', ((char __user *) buffer) + len))
2098                                 return -EFAULT;
2099                         len++;
2100                 }
2101                 *lenp = len;
2102                 *ppos += len;
2103         }
2104         return 0;
2105 }
2106
2107 /**
2108  * proc_dostring - read a string sysctl
2109  * @table: the sysctl table
2110  * @write: %TRUE if this is a write to the sysctl file
2111  * @filp: the file structure
2112  * @buffer: the user buffer
2113  * @lenp: the size of the user buffer
2114  * @ppos: file position
2115  *
2116  * Reads/writes a string from/to the user buffer. If the kernel
2117  * buffer provided is not large enough to hold the string, the
2118  * string is truncated. The copied string is %NULL-terminated.
2119  * If the string is being read by the user process, it is copied
2120  * and a newline '\n' is added. It is truncated if the buffer is
2121  * not large enough.
2122  *
2123  * Returns 0 on success.
2124  */
2125 int proc_dostring(struct ctl_table *table, int write, struct file *filp,
2126                   void __user *buffer, size_t *lenp, loff_t *ppos)
2127 {
2128         return _proc_do_string(table->data, table->maxlen, write, filp,
2129                                buffer, lenp, ppos);
2130 }
2131
2132
2133 static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp,
2134                                  int *valp,
2135                                  int write, void *data)
2136 {
2137         if (write) {
2138                 *valp = *negp ? -*lvalp : *lvalp;
2139         } else {
2140                 int val = *valp;
2141                 if (val < 0) {
2142                         *negp = -1;
2143                         *lvalp = (unsigned long)-val;
2144                 } else {
2145                         *negp = 0;
2146                         *lvalp = (unsigned long)val;
2147                 }
2148         }
2149         return 0;
2150 }
2151
2152 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
2153                   int write, struct file *filp, void __user *buffer,
2154                   size_t *lenp, loff_t *ppos,
2155                   int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2156                               int write, void *data),
2157                   void *data)
2158 {
2159 #define TMPBUFLEN 21
2160         int *i, vleft, first=1, neg, val;
2161         unsigned long lval;
2162         size_t left, len;
2163         
2164         char buf[TMPBUFLEN], *p;
2165         char __user *s = buffer;
2166         
2167         if (!tbl_data || !table->maxlen || !*lenp ||
2168             (*ppos && !write)) {
2169                 *lenp = 0;
2170                 return 0;
2171         }
2172         
2173         i = (int *) tbl_data;
2174         vleft = table->maxlen / sizeof(*i);
2175         left = *lenp;
2176
2177         if (!conv)
2178                 conv = do_proc_dointvec_conv;
2179
2180         for (; left && vleft--; i++, first=0) {
2181                 if (write) {
2182                         while (left) {
2183                                 char c;
2184                                 if (get_user(c, s))
2185                                         return -EFAULT;
2186                                 if (!isspace(c))
2187                                         break;
2188                                 left--;
2189                                 s++;
2190                         }
2191                         if (!left)
2192                                 break;
2193                         neg = 0;
2194                         len = left;
2195                         if (len > sizeof(buf) - 1)
2196                                 len = sizeof(buf) - 1;
2197                         if (copy_from_user(buf, s, len))
2198                                 return -EFAULT;
2199                         buf[len] = 0;
2200                         p = buf;
2201                         if (*p == '-' && left > 1) {
2202                                 neg = 1;
2203                                 p++;
2204                         }
2205                         if (*p < '0' || *p > '9')
2206                                 break;
2207
2208                         lval = simple_strtoul(p, &p, 0);
2209
2210                         len = p-buf;
2211                         if ((len < left) && *p && !isspace(*p))
2212                                 break;
2213                         if (neg)
2214                                 val = -val;
2215                         s += len;
2216                         left -= len;
2217
2218                         if (conv(&neg, &lval, i, 1, data))
2219                                 break;
2220                 } else {
2221                         p = buf;
2222                         if (!first)
2223                                 *p++ = '\t';
2224         
2225                         if (conv(&neg, &lval, i, 0, data))
2226                                 break;
2227
2228                         sprintf(p, "%s%lu", neg ? "-" : "", lval);
2229                         len = strlen(buf);
2230                         if (len > left)
2231                                 len = left;
2232                         if(copy_to_user(s, buf, len))
2233                                 return -EFAULT;
2234                         left -= len;
2235                         s += len;
2236                 }
2237         }
2238
2239         if (!write && !first && left) {
2240                 if(put_user('\n', s))
2241                         return -EFAULT;
2242                 left--, s++;
2243         }
2244         if (write) {
2245                 while (left) {
2246                         char c;
2247                         if (get_user(c, s++))
2248                                 return -EFAULT;
2249                         if (!isspace(c))
2250                                 break;
2251                         left--;
2252                 }
2253         }
2254         if (write && first)
2255                 return -EINVAL;
2256         *lenp -= left;
2257         *ppos += *lenp;
2258         return 0;
2259 #undef TMPBUFLEN
2260 }
2261
2262 static int do_proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2263                   void __user *buffer, size_t *lenp, loff_t *ppos,
2264                   int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2265                               int write, void *data),
2266                   void *data)
2267 {
2268         return __do_proc_dointvec(table->data, table, write, filp,
2269                         buffer, lenp, ppos, conv, data);
2270 }
2271
2272 /**
2273  * proc_dointvec - read a vector of integers
2274  * @table: the sysctl table
2275  * @write: %TRUE if this is a write to the sysctl file
2276  * @filp: the file structure
2277  * @buffer: the user buffer
2278  * @lenp: the size of the user buffer
2279  * @ppos: file position
2280  *
2281  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2282  * values from/to the user buffer, treated as an ASCII string. 
2283  *
2284  * Returns 0 on success.
2285  */
2286 int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2287                      void __user *buffer, size_t *lenp, loff_t *ppos)
2288 {
2289     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2290                             NULL,NULL);
2291 }
2292
2293 /*
2294  * Taint values can only be increased
2295  * This means we can safely use a temporary.
2296  */
2297 static int proc_taint(struct ctl_table *table, int write, struct file *filp,
2298                                void __user *buffer, size_t *lenp, loff_t *ppos)
2299 {
2300         struct ctl_table t;
2301         unsigned long tmptaint = get_taint();
2302         int err;
2303
2304         if (write && !capable(CAP_SYS_ADMIN))
2305                 return -EPERM;
2306
2307         t = *table;
2308         t.data = &tmptaint;
2309         err = proc_doulongvec_minmax(&t, write, filp, buffer, lenp, ppos);
2310         if (err < 0)
2311                 return err;
2312
2313         if (write) {
2314                 /*
2315                  * Poor man's atomic or. Not worth adding a primitive
2316                  * to everyone's atomic.h for this
2317                  */
2318                 int i;
2319                 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2320                         if ((tmptaint >> i) & 1)
2321                                 add_taint(i);
2322                 }
2323         }
2324
2325         return err;
2326 }
2327
2328 struct do_proc_dointvec_minmax_conv_param {
2329         int *min;
2330         int *max;
2331 };
2332
2333 static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp, 
2334                                         int *valp, 
2335                                         int write, void *data)
2336 {
2337         struct do_proc_dointvec_minmax_conv_param *param = data;
2338         if (write) {
2339                 int val = *negp ? -*lvalp : *lvalp;
2340                 if ((param->min && *param->min > val) ||
2341                     (param->max && *param->max < val))
2342                         return -EINVAL;
2343                 *valp = val;
2344         } else {
2345                 int val = *valp;
2346                 if (val < 0) {
2347                         *negp = -1;
2348                         *lvalp = (unsigned long)-val;
2349                 } else {
2350                         *negp = 0;
2351                         *lvalp = (unsigned long)val;
2352                 }
2353         }
2354         return 0;
2355 }
2356
2357 /**
2358  * proc_dointvec_minmax - read a vector of integers with min/max values
2359  * @table: the sysctl table
2360  * @write: %TRUE if this is a write to the sysctl file
2361  * @filp: the file structure
2362  * @buffer: the user buffer
2363  * @lenp: the size of the user buffer
2364  * @ppos: file position
2365  *
2366  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2367  * values from/to the user buffer, treated as an ASCII string.
2368  *
2369  * This routine will ensure the values are within the range specified by
2370  * table->extra1 (min) and table->extra2 (max).
2371  *
2372  * Returns 0 on success.
2373  */
2374 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
2375                   void __user *buffer, size_t *lenp, loff_t *ppos)
2376 {
2377         struct do_proc_dointvec_minmax_conv_param param = {
2378                 .min = (int *) table->extra1,
2379                 .max = (int *) table->extra2,
2380         };
2381         return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2382                                 do_proc_dointvec_minmax_conv, &param);
2383 }
2384
2385 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2386                                      struct file *filp,
2387                                      void __user *buffer,
2388                                      size_t *lenp, loff_t *ppos,
2389                                      unsigned long convmul,
2390                                      unsigned long convdiv)
2391 {
2392 #define TMPBUFLEN 21
2393         unsigned long *i, *min, *max, val;
2394         int vleft, first=1, neg;
2395         size_t len, left;
2396         char buf[TMPBUFLEN], *p;
2397         char __user *s = buffer;
2398         
2399         if (!data || !table->maxlen || !*lenp ||
2400             (*ppos && !write)) {
2401                 *lenp = 0;
2402                 return 0;
2403         }
2404         
2405         i = (unsigned long *) data;
2406         min = (unsigned long *) table->extra1;
2407         max = (unsigned long *) table->extra2;
2408         vleft = table->maxlen / sizeof(unsigned long);
2409         left = *lenp;
2410         
2411         for (; left && vleft--; i++, min++, max++, first=0) {
2412                 if (write) {
2413                         while (left) {
2414                                 char c;
2415                                 if (get_user(c, s))
2416                                         return -EFAULT;
2417                                 if (!isspace(c))
2418                                         break;
2419                                 left--;
2420                                 s++;
2421                         }
2422                         if (!left)
2423                                 break;
2424                         neg = 0;
2425                         len = left;
2426                         if (len > TMPBUFLEN-1)
2427                                 len = TMPBUFLEN-1;
2428                         if (copy_from_user(buf, s, len))
2429                                 return -EFAULT;
2430                         buf[len] = 0;
2431                         p = buf;
2432                         if (*p == '-' && left > 1) {
2433                                 neg = 1;
2434                                 p++;
2435                         }
2436                         if (*p < '0' || *p > '9')
2437                                 break;
2438                         val = simple_strtoul(p, &p, 0) * convmul / convdiv ;
2439                         len = p-buf;
2440                         if ((len < left) && *p && !isspace(*p))
2441                                 break;
2442                         if (neg)
2443                                 val = -val;
2444                         s += len;
2445                         left -= len;
2446
2447                         if(neg)
2448                                 continue;
2449                         if ((min && val < *min) || (max && val > *max))
2450                                 continue;
2451                         *i = val;
2452                 } else {
2453                         p = buf;
2454                         if (!first)
2455                                 *p++ = '\t';
2456                         sprintf(p, "%lu", convdiv * (*i) / convmul);
2457                         len = strlen(buf);
2458                         if (len > left)
2459                                 len = left;
2460                         if(copy_to_user(s, buf, len))
2461                                 return -EFAULT;
2462                         left -= len;
2463                         s += len;
2464                 }
2465         }
2466
2467         if (!write && !first && left) {
2468                 if(put_user('\n', s))
2469                         return -EFAULT;
2470                 left--, s++;
2471         }
2472         if (write) {
2473                 while (left) {
2474                         char c;
2475                         if (get_user(c, s++))
2476                                 return -EFAULT;
2477                         if (!isspace(c))
2478                                 break;
2479                         left--;
2480                 }
2481         }
2482         if (write && first)
2483                 return -EINVAL;
2484         *lenp -= left;
2485         *ppos += *lenp;
2486         return 0;
2487 #undef TMPBUFLEN
2488 }
2489
2490 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2491                                      struct file *filp,
2492                                      void __user *buffer,
2493                                      size_t *lenp, loff_t *ppos,
2494                                      unsigned long convmul,
2495                                      unsigned long convdiv)
2496 {
2497         return __do_proc_doulongvec_minmax(table->data, table, write,
2498                         filp, buffer, lenp, ppos, convmul, convdiv);
2499 }
2500
2501 /**
2502  * proc_doulongvec_minmax - read a vector of long integers with min/max values
2503  * @table: the sysctl table
2504  * @write: %TRUE if this is a write to the sysctl file
2505  * @filp: the file structure
2506  * @buffer: the user buffer
2507  * @lenp: the size of the user buffer
2508  * @ppos: file position
2509  *
2510  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2511  * values from/to the user buffer, treated as an ASCII string.
2512  *
2513  * This routine will ensure the values are within the range specified by
2514  * table->extra1 (min) and table->extra2 (max).
2515  *
2516  * Returns 0 on success.
2517  */
2518 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
2519                            void __user *buffer, size_t *lenp, loff_t *ppos)
2520 {
2521     return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l);
2522 }
2523
2524 /**
2525  * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2526  * @table: the sysctl table
2527  * @write: %TRUE if this is a write to the sysctl file
2528  * @filp: the file structure
2529  * @buffer: the user buffer
2530  * @lenp: the size of the user buffer
2531  * @ppos: file position
2532  *
2533  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2534  * values from/to the user buffer, treated as an ASCII string. The values
2535  * are treated as milliseconds, and converted to jiffies when they are stored.
2536  *
2537  * This routine will ensure the values are within the range specified by
2538  * table->extra1 (min) and table->extra2 (max).
2539  *
2540  * Returns 0 on success.
2541  */
2542 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2543                                       struct file *filp,
2544                                       void __user *buffer,
2545                                       size_t *lenp, loff_t *ppos)
2546 {
2547     return do_proc_doulongvec_minmax(table, write, filp, buffer,
2548                                      lenp, ppos, HZ, 1000l);
2549 }
2550
2551
2552 static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp,
2553                                          int *valp,
2554                                          int write, void *data)
2555 {
2556         if (write) {
2557                 if (*lvalp > LONG_MAX / HZ)
2558                         return 1;
2559                 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2560         } else {
2561                 int val = *valp;
2562                 unsigned long lval;
2563                 if (val < 0) {
2564                         *negp = -1;
2565                         lval = (unsigned long)-val;
2566                 } else {
2567                         *negp = 0;
2568                         lval = (unsigned long)val;
2569                 }
2570                 *lvalp = lval / HZ;
2571         }
2572         return 0;
2573 }
2574
2575 static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp,
2576                                                 int *valp,
2577                                                 int write, void *data)
2578 {
2579         if (write) {
2580                 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2581                         return 1;
2582                 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2583         } else {
2584                 int val = *valp;
2585                 unsigned long lval;
2586                 if (val < 0) {
2587                         *negp = -1;
2588                         lval = (unsigned long)-val;
2589                 } else {
2590                         *negp = 0;
2591                         lval = (unsigned long)val;
2592                 }
2593                 *lvalp = jiffies_to_clock_t(lval);
2594         }
2595         return 0;
2596 }
2597
2598 static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp,
2599                                             int *valp,
2600                                             int write, void *data)
2601 {
2602         if (write) {
2603                 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2604         } else {
2605                 int val = *valp;
2606                 unsigned long lval;
2607                 if (val < 0) {
2608                         *negp = -1;
2609                         lval = (unsigned long)-val;
2610                 } else {
2611                         *negp = 0;
2612                         lval = (unsigned long)val;
2613                 }
2614                 *lvalp = jiffies_to_msecs(lval);
2615         }
2616         return 0;
2617 }
2618
2619 /**
2620  * proc_dointvec_jiffies - read a vector of integers as seconds
2621  * @table: the sysctl table
2622  * @write: %TRUE if this is a write to the sysctl file
2623  * @filp: the file structure
2624  * @buffer: the user buffer
2625  * @lenp: the size of the user buffer
2626  * @ppos: file position
2627  *
2628  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2629  * values from/to the user buffer, treated as an ASCII string. 
2630  * The values read are assumed to be in seconds, and are converted into
2631  * jiffies.
2632  *
2633  * Returns 0 on success.
2634  */
2635 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
2636                           void __user *buffer, size_t *lenp, loff_t *ppos)
2637 {
2638     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2639                             do_proc_dointvec_jiffies_conv,NULL);
2640 }
2641
2642 /**
2643  * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2644  * @table: the sysctl table
2645  * @write: %TRUE if this is a write to the sysctl file
2646  * @filp: the file structure
2647  * @buffer: the user buffer
2648  * @lenp: the size of the user buffer
2649  * @ppos: pointer to the file position
2650  *
2651  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2652  * values from/to the user buffer, treated as an ASCII string. 
2653  * The values read are assumed to be in 1/USER_HZ seconds, and 
2654  * are converted into jiffies.
2655  *
2656  * Returns 0 on success.
2657  */
2658 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
2659                                  void __user *buffer, size_t *lenp, loff_t *ppos)
2660 {
2661     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2662                             do_proc_dointvec_userhz_jiffies_conv,NULL);
2663 }
2664
2665 /**
2666  * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2667  * @table: the sysctl table
2668  * @write: %TRUE if this is a write to the sysctl file
2669  * @filp: the file structure
2670  * @buffer: the user buffer
2671  * @lenp: the size of the user buffer
2672  * @ppos: file position
2673  * @ppos: the current position in the file
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 1/1000 seconds, and 
2678  * are converted into jiffies.
2679  *
2680  * Returns 0 on success.
2681  */
2682 int proc_dointvec_ms_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_ms_jiffies_conv, NULL);
2687 }
2688
2689 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
2690                            void __user *buffer, size_t *lenp, loff_t *ppos)
2691 {
2692         struct pid *new_pid;
2693         pid_t tmp;
2694         int r;
2695
2696         tmp = pid_vnr(cad_pid);
2697
2698         r = __do_proc_dointvec(&tmp, table, write, filp, buffer,
2699                                lenp, ppos, NULL, NULL);
2700         if (r || !write)
2701                 return r;
2702
2703         new_pid = find_get_pid(tmp);
2704         if (!new_pid)
2705                 return -ESRCH;
2706
2707         put_pid(xchg(&cad_pid, new_pid));
2708         return 0;
2709 }
2710
2711 #else /* CONFIG_PROC_FS */
2712
2713 int proc_dostring(struct ctl_table *table, int write, struct file *filp,
2714                   void __user *buffer, size_t *lenp, loff_t *ppos)
2715 {
2716         return -ENOSYS;
2717 }
2718
2719 int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2720                   void __user *buffer, size_t *lenp, loff_t *ppos)
2721 {
2722         return -ENOSYS;
2723 }
2724
2725 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
2726                     void __user *buffer, size_t *lenp, loff_t *ppos)
2727 {
2728         return -ENOSYS;
2729 }
2730
2731 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
2732                     void __user *buffer, size_t *lenp, loff_t *ppos)
2733 {
2734         return -ENOSYS;
2735 }
2736
2737 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
2738                     void __user *buffer, size_t *lenp, loff_t *ppos)
2739 {
2740         return -ENOSYS;
2741 }
2742
2743 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
2744                              void __user *buffer, size_t *lenp, loff_t *ppos)
2745 {
2746         return -ENOSYS;
2747 }
2748
2749 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
2750                     void __user *buffer, size_t *lenp, loff_t *ppos)
2751 {
2752         return -ENOSYS;
2753 }
2754
2755 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2756                                       struct file *filp,
2757                                       void __user *buffer,
2758                                       size_t *lenp, loff_t *ppos)
2759 {
2760     return -ENOSYS;
2761 }
2762
2763
2764 #endif /* CONFIG_PROC_FS */
2765
2766
2767 #ifdef CONFIG_SYSCTL_SYSCALL
2768 /*
2769  * General sysctl support routines 
2770  */
2771
2772 /* The generic sysctl data routine (used if no strategy routine supplied) */
2773 int sysctl_data(struct ctl_table *table,
2774                 void __user *oldval, size_t __user *oldlenp,
2775                 void __user *newval, size_t newlen)
2776 {
2777         size_t len;
2778
2779         /* Get out of I don't have a variable */
2780         if (!table->data || !table->maxlen)
2781                 return -ENOTDIR;
2782
2783         if (oldval && oldlenp) {
2784                 if (get_user(len, oldlenp))
2785                         return -EFAULT;
2786                 if (len) {
2787                         if (len > table->maxlen)
2788                                 len = table->maxlen;
2789                         if (copy_to_user(oldval, table->data, len))
2790                                 return -EFAULT;
2791                         if (put_user(len, oldlenp))
2792                                 return -EFAULT;
2793                 }
2794         }
2795
2796         if (newval && newlen) {
2797                 if (newlen > table->maxlen)
2798                         newlen = table->maxlen;
2799
2800                 if (copy_from_user(table->data, newval, newlen))
2801                         return -EFAULT;
2802         }
2803         return 1;
2804 }
2805
2806 /* The generic string strategy routine: */
2807 int sysctl_string(struct ctl_table *table,
2808                   void __user *oldval, size_t __user *oldlenp,
2809                   void __user *newval, size_t newlen)
2810 {
2811         if (!table->data || !table->maxlen) 
2812                 return -ENOTDIR;
2813         
2814         if (oldval && oldlenp) {
2815                 size_t bufsize;
2816                 if (get_user(bufsize, oldlenp))
2817                         return -EFAULT;
2818                 if (bufsize) {
2819                         size_t len = strlen(table->data), copied;
2820
2821                         /* This shouldn't trigger for a well-formed sysctl */
2822                         if (len > table->maxlen)
2823                                 len = table->maxlen;
2824
2825                         /* Copy up to a max of bufsize-1 bytes of the string */
2826                         copied = (len >= bufsize) ? bufsize - 1 : len;
2827
2828                         if (copy_to_user(oldval, table->data, copied) ||
2829                             put_user(0, (char __user *)(oldval + copied)))
2830                                 return -EFAULT;
2831                         if (put_user(len, oldlenp))
2832                                 return -EFAULT;
2833                 }
2834         }
2835         if (newval && newlen) {
2836                 size_t len = newlen;
2837                 if (len > table->maxlen)
2838                         len = table->maxlen;
2839                 if(copy_from_user(table->data, newval, len))
2840                         return -EFAULT;
2841                 if (len == table->maxlen)
2842                         len--;
2843                 ((char *) table->data)[len] = 0;
2844         }
2845         return 1;
2846 }
2847
2848 /*
2849  * This function makes sure that all of the integers in the vector
2850  * are between the minimum and maximum values given in the arrays
2851  * table->extra1 and table->extra2, respectively.
2852  */
2853 int sysctl_intvec(struct ctl_table *table,
2854                 void __user *oldval, size_t __user *oldlenp,
2855                 void __user *newval, size_t newlen)
2856 {
2857
2858         if (newval && newlen) {
2859                 int __user *vec = (int __user *) newval;
2860                 int *min = (int *) table->extra1;
2861                 int *max = (int *) table->extra2;
2862                 size_t length;
2863                 int i;
2864
2865                 if (newlen % sizeof(int) != 0)
2866                         return -EINVAL;
2867
2868                 if (!table->extra1 && !table->extra2)
2869                         return 0;
2870
2871                 if (newlen > table->maxlen)
2872                         newlen = table->maxlen;
2873                 length = newlen / sizeof(int);
2874
2875                 for (i = 0; i < length; i++) {
2876                         int value;
2877                         if (get_user(value, vec + i))
2878                                 return -EFAULT;
2879                         if (min && value < min[i])
2880                                 return -EINVAL;
2881                         if (max && value > max[i])
2882                                 return -EINVAL;
2883                 }
2884         }
2885         return 0;
2886 }
2887
2888 /* Strategy function to convert jiffies to seconds */ 
2889 int sysctl_jiffies(struct ctl_table *table,
2890                 void __user *oldval, size_t __user *oldlenp,
2891                 void __user *newval, size_t newlen)
2892 {
2893         if (oldval && oldlenp) {
2894                 size_t olen;
2895
2896                 if (get_user(olen, oldlenp))
2897                         return -EFAULT;
2898                 if (olen) {
2899                         int val;
2900
2901                         if (olen < sizeof(int))
2902                                 return -EINVAL;
2903
2904                         val = *(int *)(table->data) / HZ;
2905                         if (put_user(val, (int __user *)oldval))
2906                                 return -EFAULT;
2907                         if (put_user(sizeof(int), oldlenp))
2908                                 return -EFAULT;
2909                 }
2910         }
2911         if (newval && newlen) { 
2912                 int new;
2913                 if (newlen != sizeof(int))
2914                         return -EINVAL; 
2915                 if (get_user(new, (int __user *)newval))
2916                         return -EFAULT;
2917                 *(int *)(table->data) = new*HZ; 
2918         }
2919         return 1;
2920 }
2921
2922 /* Strategy function to convert jiffies to seconds */ 
2923 int sysctl_ms_jiffies(struct ctl_table *table,
2924                 void __user *oldval, size_t __user *oldlenp,
2925                 void __user *newval, size_t newlen)
2926 {
2927         if (oldval && oldlenp) {
2928                 size_t olen;
2929
2930                 if (get_user(olen, oldlenp))
2931                         return -EFAULT;
2932                 if (olen) {
2933                         int val;
2934
2935                         if (olen < sizeof(int))
2936                                 return -EINVAL;
2937
2938                         val = jiffies_to_msecs(*(int *)(table->data));
2939                         if (put_user(val, (int __user *)oldval))
2940                                 return -EFAULT;
2941                         if (put_user(sizeof(int), oldlenp))
2942                                 return -EFAULT;
2943                 }
2944         }
2945         if (newval && newlen) { 
2946                 int new;
2947                 if (newlen != sizeof(int))
2948                         return -EINVAL; 
2949                 if (get_user(new, (int __user *)newval))
2950                         return -EFAULT;
2951                 *(int *)(table->data) = msecs_to_jiffies(new);
2952         }
2953         return 1;
2954 }
2955
2956
2957
2958 #else /* CONFIG_SYSCTL_SYSCALL */
2959
2960
2961 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
2962 {
2963         struct __sysctl_args tmp;
2964         int error;
2965
2966         if (copy_from_user(&tmp, args, sizeof(tmp)))
2967                 return -EFAULT;
2968
2969         error = deprecated_sysctl_warning(&tmp);
2970
2971         /* If no error reading the parameters then just -ENOSYS ... */
2972         if (!error)
2973                 error = -ENOSYS;
2974
2975         return error;
2976 }
2977
2978 int sysctl_data(struct ctl_table *table,
2979                   void __user *oldval, size_t __user *oldlenp,
2980                   void __user *newval, size_t newlen)
2981 {
2982         return -ENOSYS;
2983 }
2984
2985 int sysctl_string(struct ctl_table *table,
2986                   void __user *oldval, size_t __user *oldlenp,
2987                   void __user *newval, size_t newlen)
2988 {
2989         return -ENOSYS;
2990 }
2991
2992 int sysctl_intvec(struct ctl_table *table,
2993                 void __user *oldval, size_t __user *oldlenp,
2994                 void __user *newval, size_t newlen)
2995 {
2996         return -ENOSYS;
2997 }
2998
2999 int sysctl_jiffies(struct ctl_table *table,
3000                 void __user *oldval, size_t __user *oldlenp,
3001                 void __user *newval, size_t newlen)
3002 {
3003         return -ENOSYS;
3004 }
3005
3006 int sysctl_ms_jiffies(struct ctl_table *table,
3007                 void __user *oldval, size_t __user *oldlenp,
3008                 void __user *newval, size_t newlen)
3009 {
3010         return -ENOSYS;
3011 }
3012
3013 #endif /* CONFIG_SYSCTL_SYSCALL */
3014
3015 static int deprecated_sysctl_warning(struct __sysctl_args *args)
3016 {
3017         static int msg_count;
3018         int name[CTL_MAXNAME];
3019         int i;
3020
3021         /* Check args->nlen. */
3022         if (args->nlen < 0 || args->nlen > CTL_MAXNAME)
3023                 return -ENOTDIR;
3024
3025         /* Read in the sysctl name for better debug message logging */
3026         for (i = 0; i < args->nlen; i++)
3027                 if (get_user(name[i], args->name + i))
3028                         return -EFAULT;
3029
3030         /* Ignore accesses to kernel.version */
3031         if ((args->nlen == 2) && (name[0] == CTL_KERN) && (name[1] == KERN_VERSION))
3032                 return 0;
3033
3034         if (msg_count < 5) {
3035                 msg_count++;
3036                 printk(KERN_INFO
3037                         "warning: process `%s' used the deprecated sysctl "
3038                         "system call with ", current->comm);
3039                 for (i = 0; i < args->nlen; i++)
3040                         printk("%d.", name[i]);
3041                 printk("\n");
3042         }
3043         return 0;
3044 }
3045
3046 /*
3047  * No sense putting this after each symbol definition, twice,
3048  * exception granted :-)
3049  */
3050 EXPORT_SYMBOL(proc_dointvec);
3051 EXPORT_SYMBOL(proc_dointvec_jiffies);
3052 EXPORT_SYMBOL(proc_dointvec_minmax);
3053 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
3054 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
3055 EXPORT_SYMBOL(proc_dostring);
3056 EXPORT_SYMBOL(proc_doulongvec_minmax);
3057 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
3058 EXPORT_SYMBOL(register_sysctl_table);
3059 EXPORT_SYMBOL(register_sysctl_paths);
3060 EXPORT_SYMBOL(sysctl_intvec);
3061 EXPORT_SYMBOL(sysctl_jiffies);
3062 EXPORT_SYMBOL(sysctl_ms_jiffies);
3063 EXPORT_SYMBOL(sysctl_string);
3064 EXPORT_SYMBOL(sysctl_data);
3065 EXPORT_SYMBOL(unregister_sysctl_table);