[PATCH] allow delayed freeing of ctl_table_header
[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 maps_protect;
84 extern int latencytop_enabled;
85 extern int sysctl_nr_open_min, sysctl_nr_open_max;
86 #ifdef CONFIG_RCU_TORTURE_TEST
87 extern int rcutorture_runnable;
88 #endif /* #ifdef CONFIG_RCU_TORTURE_TEST */
89
90 /* Constants used for minimum and  maximum */
91 #if defined(CONFIG_HIGHMEM) || defined(CONFIG_DETECT_SOFTLOCKUP)
92 static int one = 1;
93 #endif
94
95 #ifdef CONFIG_DETECT_SOFTLOCKUP
96 static int sixty = 60;
97 static int neg_one = -1;
98 #endif
99
100 #ifdef CONFIG_MMU
101 static int two = 2;
102 #endif
103
104 static int zero;
105 static int one_hundred = 100;
106
107 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
108 static int maxolduid = 65535;
109 static int minolduid;
110 static int min_percpu_pagelist_fract = 8;
111
112 static int ngroups_max = NGROUPS_MAX;
113
114 #ifdef CONFIG_MODULES
115 extern char modprobe_path[];
116 #endif
117 #ifdef CONFIG_CHR_DEV_SG
118 extern int sg_big_buff;
119 #endif
120
121 #ifdef __sparc__
122 extern char reboot_command [];
123 extern int stop_a_enabled;
124 extern int scons_pwroff;
125 #endif
126
127 #ifdef __hppa__
128 extern int pwrsw_enabled;
129 extern int unaligned_enabled;
130 #endif
131
132 #ifdef CONFIG_S390
133 #ifdef CONFIG_MATHEMU
134 extern int sysctl_ieee_emulation_warnings;
135 #endif
136 extern int sysctl_userprocess_debug;
137 extern int spin_retry;
138 #endif
139
140 #ifdef CONFIG_BSD_PROCESS_ACCT
141 extern int acct_parm[];
142 #endif
143
144 #ifdef CONFIG_IA64
145 extern int no_unaligned_warning;
146 #endif
147
148 #ifdef CONFIG_RT_MUTEXES
149 extern int max_lock_depth;
150 #endif
151
152 #ifdef CONFIG_PROC_SYSCTL
153 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
154                   void __user *buffer, size_t *lenp, loff_t *ppos);
155 static int proc_dointvec_taint(struct ctl_table *table, int write, struct file *filp,
156                                void __user *buffer, size_t *lenp, loff_t *ppos);
157 #endif
158
159 static struct ctl_table root_table[];
160 static struct ctl_table_root sysctl_table_root;
161 static struct ctl_table_header root_table_header = {
162         .ctl_table = root_table,
163         .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.default_set.list),
164         .root = &sysctl_table_root,
165         .set = &sysctl_table_root.default_set,
166 };
167 static struct ctl_table_root sysctl_table_root = {
168         .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list),
169         .default_set.list = LIST_HEAD_INIT(root_table_header.ctl_entry),
170 };
171
172 static struct ctl_table kern_table[];
173 static struct ctl_table vm_table[];
174 static struct ctl_table fs_table[];
175 static struct ctl_table debug_table[];
176 static struct ctl_table dev_table[];
177 extern struct ctl_table random_table[];
178 #ifdef CONFIG_INOTIFY_USER
179 extern struct ctl_table inotify_table[];
180 #endif
181
182 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
183 int sysctl_legacy_va_layout;
184 #endif
185
186 extern int prove_locking;
187 extern int lock_stat;
188
189 /* The default sysctl tables: */
190
191 static struct ctl_table root_table[] = {
192         {
193                 .ctl_name       = CTL_KERN,
194                 .procname       = "kernel",
195                 .mode           = 0555,
196                 .child          = kern_table,
197         },
198         {
199                 .ctl_name       = CTL_VM,
200                 .procname       = "vm",
201                 .mode           = 0555,
202                 .child          = vm_table,
203         },
204         {
205                 .ctl_name       = CTL_FS,
206                 .procname       = "fs",
207                 .mode           = 0555,
208                 .child          = fs_table,
209         },
210         {
211                 .ctl_name       = CTL_DEBUG,
212                 .procname       = "debug",
213                 .mode           = 0555,
214                 .child          = debug_table,
215         },
216         {
217                 .ctl_name       = CTL_DEV,
218                 .procname       = "dev",
219                 .mode           = 0555,
220                 .child          = dev_table,
221         },
222 /*
223  * NOTE: do not add new entries to this table unless you have read
224  * Documentation/sysctl/ctl_unnumbered.txt
225  */
226         { .ctl_name = 0 }
227 };
228
229 #ifdef CONFIG_SCHED_DEBUG
230 static int min_sched_granularity_ns = 100000;           /* 100 usecs */
231 static int max_sched_granularity_ns = NSEC_PER_SEC;     /* 1 second */
232 static int min_wakeup_granularity_ns;                   /* 0 usecs */
233 static int max_wakeup_granularity_ns = NSEC_PER_SEC;    /* 1 second */
234 #endif
235
236 static struct ctl_table kern_table[] = {
237 #ifdef CONFIG_SCHED_DEBUG
238         {
239                 .ctl_name       = CTL_UNNUMBERED,
240                 .procname       = "sched_min_granularity_ns",
241                 .data           = &sysctl_sched_min_granularity,
242                 .maxlen         = sizeof(unsigned int),
243                 .mode           = 0644,
244                 .proc_handler   = &sched_nr_latency_handler,
245                 .strategy       = &sysctl_intvec,
246                 .extra1         = &min_sched_granularity_ns,
247                 .extra2         = &max_sched_granularity_ns,
248         },
249         {
250                 .ctl_name       = CTL_UNNUMBERED,
251                 .procname       = "sched_latency_ns",
252                 .data           = &sysctl_sched_latency,
253                 .maxlen         = sizeof(unsigned int),
254                 .mode           = 0644,
255                 .proc_handler   = &sched_nr_latency_handler,
256                 .strategy       = &sysctl_intvec,
257                 .extra1         = &min_sched_granularity_ns,
258                 .extra2         = &max_sched_granularity_ns,
259         },
260         {
261                 .ctl_name       = CTL_UNNUMBERED,
262                 .procname       = "sched_wakeup_granularity_ns",
263                 .data           = &sysctl_sched_wakeup_granularity,
264                 .maxlen         = sizeof(unsigned int),
265                 .mode           = 0644,
266                 .proc_handler   = &proc_dointvec_minmax,
267                 .strategy       = &sysctl_intvec,
268                 .extra1         = &min_wakeup_granularity_ns,
269                 .extra2         = &max_wakeup_granularity_ns,
270         },
271         {
272                 .ctl_name       = CTL_UNNUMBERED,
273                 .procname       = "sched_shares_ratelimit",
274                 .data           = &sysctl_sched_shares_ratelimit,
275                 .maxlen         = sizeof(unsigned int),
276                 .mode           = 0644,
277                 .proc_handler   = &proc_dointvec,
278         },
279         {
280                 .ctl_name       = CTL_UNNUMBERED,
281                 .procname       = "sched_child_runs_first",
282                 .data           = &sysctl_sched_child_runs_first,
283                 .maxlen         = sizeof(unsigned int),
284                 .mode           = 0644,
285                 .proc_handler   = &proc_dointvec,
286         },
287         {
288                 .ctl_name       = CTL_UNNUMBERED,
289                 .procname       = "sched_features",
290                 .data           = &sysctl_sched_features,
291                 .maxlen         = sizeof(unsigned int),
292                 .mode           = 0644,
293                 .proc_handler   = &proc_dointvec,
294         },
295         {
296                 .ctl_name       = CTL_UNNUMBERED,
297                 .procname       = "sched_migration_cost",
298                 .data           = &sysctl_sched_migration_cost,
299                 .maxlen         = sizeof(unsigned int),
300                 .mode           = 0644,
301                 .proc_handler   = &proc_dointvec,
302         },
303         {
304                 .ctl_name       = CTL_UNNUMBERED,
305                 .procname       = "sched_nr_migrate",
306                 .data           = &sysctl_sched_nr_migrate,
307                 .maxlen         = sizeof(unsigned int),
308                 .mode           = 0644,
309                 .proc_handler   = &proc_dointvec,
310         },
311 #endif
312         {
313                 .ctl_name       = CTL_UNNUMBERED,
314                 .procname       = "sched_rt_period_us",
315                 .data           = &sysctl_sched_rt_period,
316                 .maxlen         = sizeof(unsigned int),
317                 .mode           = 0644,
318                 .proc_handler   = &sched_rt_handler,
319         },
320         {
321                 .ctl_name       = CTL_UNNUMBERED,
322                 .procname       = "sched_rt_runtime_us",
323                 .data           = &sysctl_sched_rt_runtime,
324                 .maxlen         = sizeof(int),
325                 .mode           = 0644,
326                 .proc_handler   = &sched_rt_handler,
327         },
328         {
329                 .ctl_name       = CTL_UNNUMBERED,
330                 .procname       = "sched_compat_yield",
331                 .data           = &sysctl_sched_compat_yield,
332                 .maxlen         = sizeof(unsigned int),
333                 .mode           = 0644,
334                 .proc_handler   = &proc_dointvec,
335         },
336 #ifdef CONFIG_PROVE_LOCKING
337         {
338                 .ctl_name       = CTL_UNNUMBERED,
339                 .procname       = "prove_locking",
340                 .data           = &prove_locking,
341                 .maxlen         = sizeof(int),
342                 .mode           = 0644,
343                 .proc_handler   = &proc_dointvec,
344         },
345 #endif
346 #ifdef CONFIG_LOCK_STAT
347         {
348                 .ctl_name       = CTL_UNNUMBERED,
349                 .procname       = "lock_stat",
350                 .data           = &lock_stat,
351                 .maxlen         = sizeof(int),
352                 .mode           = 0644,
353                 .proc_handler   = &proc_dointvec,
354         },
355 #endif
356         {
357                 .ctl_name       = KERN_PANIC,
358                 .procname       = "panic",
359                 .data           = &panic_timeout,
360                 .maxlen         = sizeof(int),
361                 .mode           = 0644,
362                 .proc_handler   = &proc_dointvec,
363         },
364         {
365                 .ctl_name       = KERN_CORE_USES_PID,
366                 .procname       = "core_uses_pid",
367                 .data           = &core_uses_pid,
368                 .maxlen         = sizeof(int),
369                 .mode           = 0644,
370                 .proc_handler   = &proc_dointvec,
371         },
372         {
373                 .ctl_name       = KERN_CORE_PATTERN,
374                 .procname       = "core_pattern",
375                 .data           = core_pattern,
376                 .maxlen         = CORENAME_MAX_SIZE,
377                 .mode           = 0644,
378                 .proc_handler   = &proc_dostring,
379                 .strategy       = &sysctl_string,
380         },
381 #ifdef CONFIG_PROC_SYSCTL
382         {
383                 .procname       = "tainted",
384                 .data           = &tainted,
385                 .maxlen         = sizeof(int),
386                 .mode           = 0644,
387                 .proc_handler   = &proc_dointvec_taint,
388         },
389 #endif
390 #ifdef CONFIG_LATENCYTOP
391         {
392                 .procname       = "latencytop",
393                 .data           = &latencytop_enabled,
394                 .maxlen         = sizeof(int),
395                 .mode           = 0644,
396                 .proc_handler   = &proc_dointvec,
397         },
398 #endif
399 #ifdef CONFIG_BLK_DEV_INITRD
400         {
401                 .ctl_name       = KERN_REALROOTDEV,
402                 .procname       = "real-root-dev",
403                 .data           = &real_root_dev,
404                 .maxlen         = sizeof(int),
405                 .mode           = 0644,
406                 .proc_handler   = &proc_dointvec,
407         },
408 #endif
409         {
410                 .ctl_name       = CTL_UNNUMBERED,
411                 .procname       = "print-fatal-signals",
412                 .data           = &print_fatal_signals,
413                 .maxlen         = sizeof(int),
414                 .mode           = 0644,
415                 .proc_handler   = &proc_dointvec,
416         },
417 #ifdef __sparc__
418         {
419                 .ctl_name       = KERN_SPARC_REBOOT,
420                 .procname       = "reboot-cmd",
421                 .data           = reboot_command,
422                 .maxlen         = 256,
423                 .mode           = 0644,
424                 .proc_handler   = &proc_dostring,
425                 .strategy       = &sysctl_string,
426         },
427         {
428                 .ctl_name       = KERN_SPARC_STOP_A,
429                 .procname       = "stop-a",
430                 .data           = &stop_a_enabled,
431                 .maxlen         = sizeof (int),
432                 .mode           = 0644,
433                 .proc_handler   = &proc_dointvec,
434         },
435         {
436                 .ctl_name       = KERN_SPARC_SCONS_PWROFF,
437                 .procname       = "scons-poweroff",
438                 .data           = &scons_pwroff,
439                 .maxlen         = sizeof (int),
440                 .mode           = 0644,
441                 .proc_handler   = &proc_dointvec,
442         },
443 #endif
444 #ifdef __hppa__
445         {
446                 .ctl_name       = KERN_HPPA_PWRSW,
447                 .procname       = "soft-power",
448                 .data           = &pwrsw_enabled,
449                 .maxlen         = sizeof (int),
450                 .mode           = 0644,
451                 .proc_handler   = &proc_dointvec,
452         },
453         {
454                 .ctl_name       = KERN_HPPA_UNALIGNED,
455                 .procname       = "unaligned-trap",
456                 .data           = &unaligned_enabled,
457                 .maxlen         = sizeof (int),
458                 .mode           = 0644,
459                 .proc_handler   = &proc_dointvec,
460         },
461 #endif
462         {
463                 .ctl_name       = KERN_CTLALTDEL,
464                 .procname       = "ctrl-alt-del",
465                 .data           = &C_A_D,
466                 .maxlen         = sizeof(int),
467                 .mode           = 0644,
468                 .proc_handler   = &proc_dointvec,
469         },
470 #ifdef CONFIG_FTRACE
471         {
472                 .ctl_name       = CTL_UNNUMBERED,
473                 .procname       = "ftrace_enabled",
474                 .data           = &ftrace_enabled,
475                 .maxlen         = sizeof(int),
476                 .mode           = 0644,
477                 .proc_handler   = &ftrace_enable_sysctl,
478         },
479 #endif
480 #ifdef CONFIG_MODULES
481         {
482                 .ctl_name       = KERN_MODPROBE,
483                 .procname       = "modprobe",
484                 .data           = &modprobe_path,
485                 .maxlen         = KMOD_PATH_LEN,
486                 .mode           = 0644,
487                 .proc_handler   = &proc_dostring,
488                 .strategy       = &sysctl_string,
489         },
490 #endif
491 #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
492         {
493                 .ctl_name       = KERN_HOTPLUG,
494                 .procname       = "hotplug",
495                 .data           = &uevent_helper,
496                 .maxlen         = UEVENT_HELPER_PATH_LEN,
497                 .mode           = 0644,
498                 .proc_handler   = &proc_dostring,
499                 .strategy       = &sysctl_string,
500         },
501 #endif
502 #ifdef CONFIG_CHR_DEV_SG
503         {
504                 .ctl_name       = KERN_SG_BIG_BUFF,
505                 .procname       = "sg-big-buff",
506                 .data           = &sg_big_buff,
507                 .maxlen         = sizeof (int),
508                 .mode           = 0444,
509                 .proc_handler   = &proc_dointvec,
510         },
511 #endif
512 #ifdef CONFIG_BSD_PROCESS_ACCT
513         {
514                 .ctl_name       = KERN_ACCT,
515                 .procname       = "acct",
516                 .data           = &acct_parm,
517                 .maxlen         = 3*sizeof(int),
518                 .mode           = 0644,
519                 .proc_handler   = &proc_dointvec,
520         },
521 #endif
522 #ifdef CONFIG_MAGIC_SYSRQ
523         {
524                 .ctl_name       = KERN_SYSRQ,
525                 .procname       = "sysrq",
526                 .data           = &__sysrq_enabled,
527                 .maxlen         = sizeof (int),
528                 .mode           = 0644,
529                 .proc_handler   = &proc_dointvec,
530         },
531 #endif
532 #ifdef CONFIG_PROC_SYSCTL
533         {
534                 .procname       = "cad_pid",
535                 .data           = NULL,
536                 .maxlen         = sizeof (int),
537                 .mode           = 0600,
538                 .proc_handler   = &proc_do_cad_pid,
539         },
540 #endif
541         {
542                 .ctl_name       = KERN_MAX_THREADS,
543                 .procname       = "threads-max",
544                 .data           = &max_threads,
545                 .maxlen         = sizeof(int),
546                 .mode           = 0644,
547                 .proc_handler   = &proc_dointvec,
548         },
549         {
550                 .ctl_name       = KERN_RANDOM,
551                 .procname       = "random",
552                 .mode           = 0555,
553                 .child          = random_table,
554         },
555         {
556                 .ctl_name       = KERN_OVERFLOWUID,
557                 .procname       = "overflowuid",
558                 .data           = &overflowuid,
559                 .maxlen         = sizeof(int),
560                 .mode           = 0644,
561                 .proc_handler   = &proc_dointvec_minmax,
562                 .strategy       = &sysctl_intvec,
563                 .extra1         = &minolduid,
564                 .extra2         = &maxolduid,
565         },
566         {
567                 .ctl_name       = KERN_OVERFLOWGID,
568                 .procname       = "overflowgid",
569                 .data           = &overflowgid,
570                 .maxlen         = sizeof(int),
571                 .mode           = 0644,
572                 .proc_handler   = &proc_dointvec_minmax,
573                 .strategy       = &sysctl_intvec,
574                 .extra1         = &minolduid,
575                 .extra2         = &maxolduid,
576         },
577 #ifdef CONFIG_S390
578 #ifdef CONFIG_MATHEMU
579         {
580                 .ctl_name       = KERN_IEEE_EMULATION_WARNINGS,
581                 .procname       = "ieee_emulation_warnings",
582                 .data           = &sysctl_ieee_emulation_warnings,
583                 .maxlen         = sizeof(int),
584                 .mode           = 0644,
585                 .proc_handler   = &proc_dointvec,
586         },
587 #endif
588         {
589                 .ctl_name       = KERN_S390_USER_DEBUG_LOGGING,
590                 .procname       = "userprocess_debug",
591                 .data           = &sysctl_userprocess_debug,
592                 .maxlen         = sizeof(int),
593                 .mode           = 0644,
594                 .proc_handler   = &proc_dointvec,
595         },
596 #endif
597         {
598                 .ctl_name       = KERN_PIDMAX,
599                 .procname       = "pid_max",
600                 .data           = &pid_max,
601                 .maxlen         = sizeof (int),
602                 .mode           = 0644,
603                 .proc_handler   = &proc_dointvec_minmax,
604                 .strategy       = sysctl_intvec,
605                 .extra1         = &pid_max_min,
606                 .extra2         = &pid_max_max,
607         },
608         {
609                 .ctl_name       = KERN_PANIC_ON_OOPS,
610                 .procname       = "panic_on_oops",
611                 .data           = &panic_on_oops,
612                 .maxlen         = sizeof(int),
613                 .mode           = 0644,
614                 .proc_handler   = &proc_dointvec,
615         },
616 #if defined CONFIG_PRINTK
617         {
618                 .ctl_name       = KERN_PRINTK,
619                 .procname       = "printk",
620                 .data           = &console_loglevel,
621                 .maxlen         = 4*sizeof(int),
622                 .mode           = 0644,
623                 .proc_handler   = &proc_dointvec,
624         },
625         {
626                 .ctl_name       = KERN_PRINTK_RATELIMIT,
627                 .procname       = "printk_ratelimit",
628                 .data           = &printk_ratelimit_state.interval,
629                 .maxlen         = sizeof(int),
630                 .mode           = 0644,
631                 .proc_handler   = &proc_dointvec_jiffies,
632                 .strategy       = &sysctl_jiffies,
633         },
634         {
635                 .ctl_name       = KERN_PRINTK_RATELIMIT_BURST,
636                 .procname       = "printk_ratelimit_burst",
637                 .data           = &printk_ratelimit_state.burst,
638                 .maxlen         = sizeof(int),
639                 .mode           = 0644,
640                 .proc_handler   = &proc_dointvec,
641         },
642 #endif
643         {
644                 .ctl_name       = KERN_NGROUPS_MAX,
645                 .procname       = "ngroups_max",
646                 .data           = &ngroups_max,
647                 .maxlen         = sizeof (int),
648                 .mode           = 0444,
649                 .proc_handler   = &proc_dointvec,
650         },
651 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
652         {
653                 .ctl_name       = KERN_UNKNOWN_NMI_PANIC,
654                 .procname       = "unknown_nmi_panic",
655                 .data           = &unknown_nmi_panic,
656                 .maxlen         = sizeof (int),
657                 .mode           = 0644,
658                 .proc_handler   = &proc_dointvec,
659         },
660         {
661                 .procname       = "nmi_watchdog",
662                 .data           = &nmi_watchdog_enabled,
663                 .maxlen         = sizeof (int),
664                 .mode           = 0644,
665                 .proc_handler   = &proc_nmi_enabled,
666         },
667 #endif
668 #if defined(CONFIG_X86)
669         {
670                 .ctl_name       = KERN_PANIC_ON_NMI,
671                 .procname       = "panic_on_unrecovered_nmi",
672                 .data           = &panic_on_unrecovered_nmi,
673                 .maxlen         = sizeof(int),
674                 .mode           = 0644,
675                 .proc_handler   = &proc_dointvec,
676         },
677         {
678                 .ctl_name       = KERN_BOOTLOADER_TYPE,
679                 .procname       = "bootloader_type",
680                 .data           = &bootloader_type,
681                 .maxlen         = sizeof (int),
682                 .mode           = 0444,
683                 .proc_handler   = &proc_dointvec,
684         },
685         {
686                 .ctl_name       = CTL_UNNUMBERED,
687                 .procname       = "kstack_depth_to_print",
688                 .data           = &kstack_depth_to_print,
689                 .maxlen         = sizeof(int),
690                 .mode           = 0644,
691                 .proc_handler   = &proc_dointvec,
692         },
693         {
694                 .ctl_name       = CTL_UNNUMBERED,
695                 .procname       = "io_delay_type",
696                 .data           = &io_delay_type,
697                 .maxlen         = sizeof(int),
698                 .mode           = 0644,
699                 .proc_handler   = &proc_dointvec,
700         },
701 #endif
702 #if defined(CONFIG_MMU)
703         {
704                 .ctl_name       = KERN_RANDOMIZE,
705                 .procname       = "randomize_va_space",
706                 .data           = &randomize_va_space,
707                 .maxlen         = sizeof(int),
708                 .mode           = 0644,
709                 .proc_handler   = &proc_dointvec,
710         },
711 #endif
712 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
713         {
714                 .ctl_name       = KERN_SPIN_RETRY,
715                 .procname       = "spin_retry",
716                 .data           = &spin_retry,
717                 .maxlen         = sizeof (int),
718                 .mode           = 0644,
719                 .proc_handler   = &proc_dointvec,
720         },
721 #endif
722 #if     defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
723         {
724                 .procname       = "acpi_video_flags",
725                 .data           = &acpi_realmode_flags,
726                 .maxlen         = sizeof (unsigned long),
727                 .mode           = 0644,
728                 .proc_handler   = &proc_doulongvec_minmax,
729         },
730 #endif
731 #ifdef CONFIG_IA64
732         {
733                 .ctl_name       = KERN_IA64_UNALIGNED,
734                 .procname       = "ignore-unaligned-usertrap",
735                 .data           = &no_unaligned_warning,
736                 .maxlen         = sizeof (int),
737                 .mode           = 0644,
738                 .proc_handler   = &proc_dointvec,
739         },
740 #endif
741 #ifdef CONFIG_DETECT_SOFTLOCKUP
742         {
743                 .ctl_name       = CTL_UNNUMBERED,
744                 .procname       = "softlockup_panic",
745                 .data           = &softlockup_panic,
746                 .maxlen         = sizeof(int),
747                 .mode           = 0644,
748                 .proc_handler   = &proc_dointvec_minmax,
749                 .strategy       = &sysctl_intvec,
750                 .extra1         = &zero,
751                 .extra2         = &one,
752         },
753         {
754                 .ctl_name       = CTL_UNNUMBERED,
755                 .procname       = "softlockup_thresh",
756                 .data           = &softlockup_thresh,
757                 .maxlen         = sizeof(int),
758                 .mode           = 0644,
759                 .proc_handler   = &proc_dointvec_minmax,
760                 .strategy       = &sysctl_intvec,
761                 .extra1         = &neg_one,
762                 .extra2         = &sixty,
763         },
764         {
765                 .ctl_name       = CTL_UNNUMBERED,
766                 .procname       = "hung_task_check_count",
767                 .data           = &sysctl_hung_task_check_count,
768                 .maxlen         = sizeof(unsigned long),
769                 .mode           = 0644,
770                 .proc_handler   = &proc_doulongvec_minmax,
771                 .strategy       = &sysctl_intvec,
772         },
773         {
774                 .ctl_name       = CTL_UNNUMBERED,
775                 .procname       = "hung_task_timeout_secs",
776                 .data           = &sysctl_hung_task_timeout_secs,
777                 .maxlen         = sizeof(unsigned long),
778                 .mode           = 0644,
779                 .proc_handler   = &proc_doulongvec_minmax,
780                 .strategy       = &sysctl_intvec,
781         },
782         {
783                 .ctl_name       = CTL_UNNUMBERED,
784                 .procname       = "hung_task_warnings",
785                 .data           = &sysctl_hung_task_warnings,
786                 .maxlen         = sizeof(unsigned long),
787                 .mode           = 0644,
788                 .proc_handler   = &proc_doulongvec_minmax,
789                 .strategy       = &sysctl_intvec,
790         },
791 #endif
792 #ifdef CONFIG_COMPAT
793         {
794                 .ctl_name       = KERN_COMPAT_LOG,
795                 .procname       = "compat-log",
796                 .data           = &compat_log,
797                 .maxlen         = sizeof (int),
798                 .mode           = 0644,
799                 .proc_handler   = &proc_dointvec,
800         },
801 #endif
802 #ifdef CONFIG_RT_MUTEXES
803         {
804                 .ctl_name       = KERN_MAX_LOCK_DEPTH,
805                 .procname       = "max_lock_depth",
806                 .data           = &max_lock_depth,
807                 .maxlen         = sizeof(int),
808                 .mode           = 0644,
809                 .proc_handler   = &proc_dointvec,
810         },
811 #endif
812 #ifdef CONFIG_PROC_FS
813         {
814                 .ctl_name       = CTL_UNNUMBERED,
815                 .procname       = "maps_protect",
816                 .data           = &maps_protect,
817                 .maxlen         = sizeof(int),
818                 .mode           = 0644,
819                 .proc_handler   = &proc_dointvec,
820         },
821 #endif
822         {
823                 .ctl_name       = CTL_UNNUMBERED,
824                 .procname       = "poweroff_cmd",
825                 .data           = &poweroff_cmd,
826                 .maxlen         = POWEROFF_CMD_PATH_LEN,
827                 .mode           = 0644,
828                 .proc_handler   = &proc_dostring,
829                 .strategy       = &sysctl_string,
830         },
831 #ifdef CONFIG_KEYS
832         {
833                 .ctl_name       = CTL_UNNUMBERED,
834                 .procname       = "keys",
835                 .mode           = 0555,
836                 .child          = key_sysctls,
837         },
838 #endif
839 #ifdef CONFIG_RCU_TORTURE_TEST
840         {
841                 .ctl_name       = CTL_UNNUMBERED,
842                 .procname       = "rcutorture_runnable",
843                 .data           = &rcutorture_runnable,
844                 .maxlen         = sizeof(int),
845                 .mode           = 0644,
846                 .proc_handler   = &proc_dointvec,
847         },
848 #endif
849 /*
850  * NOTE: do not add new entries to this table unless you have read
851  * Documentation/sysctl/ctl_unnumbered.txt
852  */
853         { .ctl_name = 0 }
854 };
855
856 static struct ctl_table vm_table[] = {
857         {
858                 .ctl_name       = VM_OVERCOMMIT_MEMORY,
859                 .procname       = "overcommit_memory",
860                 .data           = &sysctl_overcommit_memory,
861                 .maxlen         = sizeof(sysctl_overcommit_memory),
862                 .mode           = 0644,
863                 .proc_handler   = &proc_dointvec,
864         },
865         {
866                 .ctl_name       = VM_PANIC_ON_OOM,
867                 .procname       = "panic_on_oom",
868                 .data           = &sysctl_panic_on_oom,
869                 .maxlen         = sizeof(sysctl_panic_on_oom),
870                 .mode           = 0644,
871                 .proc_handler   = &proc_dointvec,
872         },
873         {
874                 .ctl_name       = CTL_UNNUMBERED,
875                 .procname       = "oom_kill_allocating_task",
876                 .data           = &sysctl_oom_kill_allocating_task,
877                 .maxlen         = sizeof(sysctl_oom_kill_allocating_task),
878                 .mode           = 0644,
879                 .proc_handler   = &proc_dointvec,
880         },
881         {
882                 .ctl_name       = CTL_UNNUMBERED,
883                 .procname       = "oom_dump_tasks",
884                 .data           = &sysctl_oom_dump_tasks,
885                 .maxlen         = sizeof(sysctl_oom_dump_tasks),
886                 .mode           = 0644,
887                 .proc_handler   = &proc_dointvec,
888         },
889         {
890                 .ctl_name       = VM_OVERCOMMIT_RATIO,
891                 .procname       = "overcommit_ratio",
892                 .data           = &sysctl_overcommit_ratio,
893                 .maxlen         = sizeof(sysctl_overcommit_ratio),
894                 .mode           = 0644,
895                 .proc_handler   = &proc_dointvec,
896         },
897         {
898                 .ctl_name       = VM_PAGE_CLUSTER,
899                 .procname       = "page-cluster", 
900                 .data           = &page_cluster,
901                 .maxlen         = sizeof(int),
902                 .mode           = 0644,
903                 .proc_handler   = &proc_dointvec,
904         },
905         {
906                 .ctl_name       = VM_DIRTY_BACKGROUND,
907                 .procname       = "dirty_background_ratio",
908                 .data           = &dirty_background_ratio,
909                 .maxlen         = sizeof(dirty_background_ratio),
910                 .mode           = 0644,
911                 .proc_handler   = &proc_dointvec_minmax,
912                 .strategy       = &sysctl_intvec,
913                 .extra1         = &zero,
914                 .extra2         = &one_hundred,
915         },
916         {
917                 .ctl_name       = VM_DIRTY_RATIO,
918                 .procname       = "dirty_ratio",
919                 .data           = &vm_dirty_ratio,
920                 .maxlen         = sizeof(vm_dirty_ratio),
921                 .mode           = 0644,
922                 .proc_handler   = &dirty_ratio_handler,
923                 .strategy       = &sysctl_intvec,
924                 .extra1         = &zero,
925                 .extra2         = &one_hundred,
926         },
927         {
928                 .procname       = "dirty_writeback_centisecs",
929                 .data           = &dirty_writeback_interval,
930                 .maxlen         = sizeof(dirty_writeback_interval),
931                 .mode           = 0644,
932                 .proc_handler   = &dirty_writeback_centisecs_handler,
933         },
934         {
935                 .procname       = "dirty_expire_centisecs",
936                 .data           = &dirty_expire_interval,
937                 .maxlen         = sizeof(dirty_expire_interval),
938                 .mode           = 0644,
939                 .proc_handler   = &proc_dointvec_userhz_jiffies,
940         },
941         {
942                 .ctl_name       = VM_NR_PDFLUSH_THREADS,
943                 .procname       = "nr_pdflush_threads",
944                 .data           = &nr_pdflush_threads,
945                 .maxlen         = sizeof nr_pdflush_threads,
946                 .mode           = 0444 /* read-only*/,
947                 .proc_handler   = &proc_dointvec,
948         },
949         {
950                 .ctl_name       = VM_SWAPPINESS,
951                 .procname       = "swappiness",
952                 .data           = &vm_swappiness,
953                 .maxlen         = sizeof(vm_swappiness),
954                 .mode           = 0644,
955                 .proc_handler   = &proc_dointvec_minmax,
956                 .strategy       = &sysctl_intvec,
957                 .extra1         = &zero,
958                 .extra2         = &one_hundred,
959         },
960 #ifdef CONFIG_HUGETLB_PAGE
961          {
962                 .procname       = "nr_hugepages",
963                 .data           = NULL,
964                 .maxlen         = sizeof(unsigned long),
965                 .mode           = 0644,
966                 .proc_handler   = &hugetlb_sysctl_handler,
967                 .extra1         = (void *)&hugetlb_zero,
968                 .extra2         = (void *)&hugetlb_infinity,
969          },
970          {
971                 .ctl_name       = VM_HUGETLB_GROUP,
972                 .procname       = "hugetlb_shm_group",
973                 .data           = &sysctl_hugetlb_shm_group,
974                 .maxlen         = sizeof(gid_t),
975                 .mode           = 0644,
976                 .proc_handler   = &proc_dointvec,
977          },
978          {
979                 .ctl_name       = CTL_UNNUMBERED,
980                 .procname       = "hugepages_treat_as_movable",
981                 .data           = &hugepages_treat_as_movable,
982                 .maxlen         = sizeof(int),
983                 .mode           = 0644,
984                 .proc_handler   = &hugetlb_treat_movable_handler,
985         },
986         {
987                 .ctl_name       = CTL_UNNUMBERED,
988                 .procname       = "nr_overcommit_hugepages",
989                 .data           = NULL,
990                 .maxlen         = sizeof(unsigned long),
991                 .mode           = 0644,
992                 .proc_handler   = &hugetlb_overcommit_handler,
993                 .extra1         = (void *)&hugetlb_zero,
994                 .extra2         = (void *)&hugetlb_infinity,
995         },
996 #endif
997         {
998                 .ctl_name       = VM_LOWMEM_RESERVE_RATIO,
999                 .procname       = "lowmem_reserve_ratio",
1000                 .data           = &sysctl_lowmem_reserve_ratio,
1001                 .maxlen         = sizeof(sysctl_lowmem_reserve_ratio),
1002                 .mode           = 0644,
1003                 .proc_handler   = &lowmem_reserve_ratio_sysctl_handler,
1004                 .strategy       = &sysctl_intvec,
1005         },
1006         {
1007                 .ctl_name       = VM_DROP_PAGECACHE,
1008                 .procname       = "drop_caches",
1009                 .data           = &sysctl_drop_caches,
1010                 .maxlen         = sizeof(int),
1011                 .mode           = 0644,
1012                 .proc_handler   = drop_caches_sysctl_handler,
1013                 .strategy       = &sysctl_intvec,
1014         },
1015         {
1016                 .ctl_name       = VM_MIN_FREE_KBYTES,
1017                 .procname       = "min_free_kbytes",
1018                 .data           = &min_free_kbytes,
1019                 .maxlen         = sizeof(min_free_kbytes),
1020                 .mode           = 0644,
1021                 .proc_handler   = &min_free_kbytes_sysctl_handler,
1022                 .strategy       = &sysctl_intvec,
1023                 .extra1         = &zero,
1024         },
1025         {
1026                 .ctl_name       = VM_PERCPU_PAGELIST_FRACTION,
1027                 .procname       = "percpu_pagelist_fraction",
1028                 .data           = &percpu_pagelist_fraction,
1029                 .maxlen         = sizeof(percpu_pagelist_fraction),
1030                 .mode           = 0644,
1031                 .proc_handler   = &percpu_pagelist_fraction_sysctl_handler,
1032                 .strategy       = &sysctl_intvec,
1033                 .extra1         = &min_percpu_pagelist_fract,
1034         },
1035 #ifdef CONFIG_MMU
1036         {
1037                 .ctl_name       = VM_MAX_MAP_COUNT,
1038                 .procname       = "max_map_count",
1039                 .data           = &sysctl_max_map_count,
1040                 .maxlen         = sizeof(sysctl_max_map_count),
1041                 .mode           = 0644,
1042                 .proc_handler   = &proc_dointvec
1043         },
1044 #endif
1045         {
1046                 .ctl_name       = VM_LAPTOP_MODE,
1047                 .procname       = "laptop_mode",
1048                 .data           = &laptop_mode,
1049                 .maxlen         = sizeof(laptop_mode),
1050                 .mode           = 0644,
1051                 .proc_handler   = &proc_dointvec_jiffies,
1052                 .strategy       = &sysctl_jiffies,
1053         },
1054         {
1055                 .ctl_name       = VM_BLOCK_DUMP,
1056                 .procname       = "block_dump",
1057                 .data           = &block_dump,
1058                 .maxlen         = sizeof(block_dump),
1059                 .mode           = 0644,
1060                 .proc_handler   = &proc_dointvec,
1061                 .strategy       = &sysctl_intvec,
1062                 .extra1         = &zero,
1063         },
1064         {
1065                 .ctl_name       = VM_VFS_CACHE_PRESSURE,
1066                 .procname       = "vfs_cache_pressure",
1067                 .data           = &sysctl_vfs_cache_pressure,
1068                 .maxlen         = sizeof(sysctl_vfs_cache_pressure),
1069                 .mode           = 0644,
1070                 .proc_handler   = &proc_dointvec,
1071                 .strategy       = &sysctl_intvec,
1072                 .extra1         = &zero,
1073         },
1074 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1075         {
1076                 .ctl_name       = VM_LEGACY_VA_LAYOUT,
1077                 .procname       = "legacy_va_layout",
1078                 .data           = &sysctl_legacy_va_layout,
1079                 .maxlen         = sizeof(sysctl_legacy_va_layout),
1080                 .mode           = 0644,
1081                 .proc_handler   = &proc_dointvec,
1082                 .strategy       = &sysctl_intvec,
1083                 .extra1         = &zero,
1084         },
1085 #endif
1086 #ifdef CONFIG_NUMA
1087         {
1088                 .ctl_name       = VM_ZONE_RECLAIM_MODE,
1089                 .procname       = "zone_reclaim_mode",
1090                 .data           = &zone_reclaim_mode,
1091                 .maxlen         = sizeof(zone_reclaim_mode),
1092                 .mode           = 0644,
1093                 .proc_handler   = &proc_dointvec,
1094                 .strategy       = &sysctl_intvec,
1095                 .extra1         = &zero,
1096         },
1097         {
1098                 .ctl_name       = VM_MIN_UNMAPPED,
1099                 .procname       = "min_unmapped_ratio",
1100                 .data           = &sysctl_min_unmapped_ratio,
1101                 .maxlen         = sizeof(sysctl_min_unmapped_ratio),
1102                 .mode           = 0644,
1103                 .proc_handler   = &sysctl_min_unmapped_ratio_sysctl_handler,
1104                 .strategy       = &sysctl_intvec,
1105                 .extra1         = &zero,
1106                 .extra2         = &one_hundred,
1107         },
1108         {
1109                 .ctl_name       = VM_MIN_SLAB,
1110                 .procname       = "min_slab_ratio",
1111                 .data           = &sysctl_min_slab_ratio,
1112                 .maxlen         = sizeof(sysctl_min_slab_ratio),
1113                 .mode           = 0644,
1114                 .proc_handler   = &sysctl_min_slab_ratio_sysctl_handler,
1115                 .strategy       = &sysctl_intvec,
1116                 .extra1         = &zero,
1117                 .extra2         = &one_hundred,
1118         },
1119 #endif
1120 #ifdef CONFIG_SMP
1121         {
1122                 .ctl_name       = CTL_UNNUMBERED,
1123                 .procname       = "stat_interval",
1124                 .data           = &sysctl_stat_interval,
1125                 .maxlen         = sizeof(sysctl_stat_interval),
1126                 .mode           = 0644,
1127                 .proc_handler   = &proc_dointvec_jiffies,
1128                 .strategy       = &sysctl_jiffies,
1129         },
1130 #endif
1131 #ifdef CONFIG_SECURITY
1132         {
1133                 .ctl_name       = CTL_UNNUMBERED,
1134                 .procname       = "mmap_min_addr",
1135                 .data           = &mmap_min_addr,
1136                 .maxlen         = sizeof(unsigned long),
1137                 .mode           = 0644,
1138                 .proc_handler   = &proc_doulongvec_minmax,
1139         },
1140 #endif
1141 #ifdef CONFIG_NUMA
1142         {
1143                 .ctl_name       = CTL_UNNUMBERED,
1144                 .procname       = "numa_zonelist_order",
1145                 .data           = &numa_zonelist_order,
1146                 .maxlen         = NUMA_ZONELIST_ORDER_LEN,
1147                 .mode           = 0644,
1148                 .proc_handler   = &numa_zonelist_order_handler,
1149                 .strategy       = &sysctl_string,
1150         },
1151 #endif
1152 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1153    (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1154         {
1155                 .ctl_name       = VM_VDSO_ENABLED,
1156                 .procname       = "vdso_enabled",
1157                 .data           = &vdso_enabled,
1158                 .maxlen         = sizeof(vdso_enabled),
1159                 .mode           = 0644,
1160                 .proc_handler   = &proc_dointvec,
1161                 .strategy       = &sysctl_intvec,
1162                 .extra1         = &zero,
1163         },
1164 #endif
1165 #ifdef CONFIG_HIGHMEM
1166         {
1167                 .ctl_name       = CTL_UNNUMBERED,
1168                 .procname       = "highmem_is_dirtyable",
1169                 .data           = &vm_highmem_is_dirtyable,
1170                 .maxlen         = sizeof(vm_highmem_is_dirtyable),
1171                 .mode           = 0644,
1172                 .proc_handler   = &proc_dointvec_minmax,
1173                 .strategy       = &sysctl_intvec,
1174                 .extra1         = &zero,
1175                 .extra2         = &one,
1176         },
1177 #endif
1178 /*
1179  * NOTE: do not add new entries to this table unless you have read
1180  * Documentation/sysctl/ctl_unnumbered.txt
1181  */
1182         { .ctl_name = 0 }
1183 };
1184
1185 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1186 static struct ctl_table binfmt_misc_table[] = {
1187         { .ctl_name = 0 }
1188 };
1189 #endif
1190
1191 static struct ctl_table fs_table[] = {
1192         {
1193                 .ctl_name       = FS_NRINODE,
1194                 .procname       = "inode-nr",
1195                 .data           = &inodes_stat,
1196                 .maxlen         = 2*sizeof(int),
1197                 .mode           = 0444,
1198                 .proc_handler   = &proc_dointvec,
1199         },
1200         {
1201                 .ctl_name       = FS_STATINODE,
1202                 .procname       = "inode-state",
1203                 .data           = &inodes_stat,
1204                 .maxlen         = 7*sizeof(int),
1205                 .mode           = 0444,
1206                 .proc_handler   = &proc_dointvec,
1207         },
1208         {
1209                 .procname       = "file-nr",
1210                 .data           = &files_stat,
1211                 .maxlen         = 3*sizeof(int),
1212                 .mode           = 0444,
1213                 .proc_handler   = &proc_nr_files,
1214         },
1215         {
1216                 .ctl_name       = FS_MAXFILE,
1217                 .procname       = "file-max",
1218                 .data           = &files_stat.max_files,
1219                 .maxlen         = sizeof(int),
1220                 .mode           = 0644,
1221                 .proc_handler   = &proc_dointvec,
1222         },
1223         {
1224                 .ctl_name       = CTL_UNNUMBERED,
1225                 .procname       = "nr_open",
1226                 .data           = &sysctl_nr_open,
1227                 .maxlen         = sizeof(int),
1228                 .mode           = 0644,
1229                 .proc_handler   = &proc_dointvec_minmax,
1230                 .extra1         = &sysctl_nr_open_min,
1231                 .extra2         = &sysctl_nr_open_max,
1232         },
1233         {
1234                 .ctl_name       = FS_DENTRY,
1235                 .procname       = "dentry-state",
1236                 .data           = &dentry_stat,
1237                 .maxlen         = 6*sizeof(int),
1238                 .mode           = 0444,
1239                 .proc_handler   = &proc_dointvec,
1240         },
1241         {
1242                 .ctl_name       = FS_OVERFLOWUID,
1243                 .procname       = "overflowuid",
1244                 .data           = &fs_overflowuid,
1245                 .maxlen         = sizeof(int),
1246                 .mode           = 0644,
1247                 .proc_handler   = &proc_dointvec_minmax,
1248                 .strategy       = &sysctl_intvec,
1249                 .extra1         = &minolduid,
1250                 .extra2         = &maxolduid,
1251         },
1252         {
1253                 .ctl_name       = FS_OVERFLOWGID,
1254                 .procname       = "overflowgid",
1255                 .data           = &fs_overflowgid,
1256                 .maxlen         = sizeof(int),
1257                 .mode           = 0644,
1258                 .proc_handler   = &proc_dointvec_minmax,
1259                 .strategy       = &sysctl_intvec,
1260                 .extra1         = &minolduid,
1261                 .extra2         = &maxolduid,
1262         },
1263         {
1264                 .ctl_name       = FS_LEASES,
1265                 .procname       = "leases-enable",
1266                 .data           = &leases_enable,
1267                 .maxlen         = sizeof(int),
1268                 .mode           = 0644,
1269                 .proc_handler   = &proc_dointvec,
1270         },
1271 #ifdef CONFIG_DNOTIFY
1272         {
1273                 .ctl_name       = FS_DIR_NOTIFY,
1274                 .procname       = "dir-notify-enable",
1275                 .data           = &dir_notify_enable,
1276                 .maxlen         = sizeof(int),
1277                 .mode           = 0644,
1278                 .proc_handler   = &proc_dointvec,
1279         },
1280 #endif
1281 #ifdef CONFIG_MMU
1282         {
1283                 .ctl_name       = FS_LEASE_TIME,
1284                 .procname       = "lease-break-time",
1285                 .data           = &lease_break_time,
1286                 .maxlen         = sizeof(int),
1287                 .mode           = 0644,
1288                 .proc_handler   = &proc_dointvec_minmax,
1289                 .strategy       = &sysctl_intvec,
1290                 .extra1         = &zero,
1291                 .extra2         = &two,
1292         },
1293         {
1294                 .procname       = "aio-nr",
1295                 .data           = &aio_nr,
1296                 .maxlen         = sizeof(aio_nr),
1297                 .mode           = 0444,
1298                 .proc_handler   = &proc_doulongvec_minmax,
1299         },
1300         {
1301                 .procname       = "aio-max-nr",
1302                 .data           = &aio_max_nr,
1303                 .maxlen         = sizeof(aio_max_nr),
1304                 .mode           = 0644,
1305                 .proc_handler   = &proc_doulongvec_minmax,
1306         },
1307 #ifdef CONFIG_INOTIFY_USER
1308         {
1309                 .ctl_name       = FS_INOTIFY,
1310                 .procname       = "inotify",
1311                 .mode           = 0555,
1312                 .child          = inotify_table,
1313         },
1314 #endif  
1315 #endif
1316         {
1317                 .ctl_name       = KERN_SETUID_DUMPABLE,
1318                 .procname       = "suid_dumpable",
1319                 .data           = &suid_dumpable,
1320                 .maxlen         = sizeof(int),
1321                 .mode           = 0644,
1322                 .proc_handler   = &proc_dointvec,
1323         },
1324 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1325         {
1326                 .ctl_name       = CTL_UNNUMBERED,
1327                 .procname       = "binfmt_misc",
1328                 .mode           = 0555,
1329                 .child          = binfmt_misc_table,
1330         },
1331 #endif
1332 /*
1333  * NOTE: do not add new entries to this table unless you have read
1334  * Documentation/sysctl/ctl_unnumbered.txt
1335  */
1336         { .ctl_name = 0 }
1337 };
1338
1339 static struct ctl_table debug_table[] = {
1340 #if defined(CONFIG_X86) || defined(CONFIG_PPC)
1341         {
1342                 .ctl_name       = CTL_UNNUMBERED,
1343                 .procname       = "exception-trace",
1344                 .data           = &show_unhandled_signals,
1345                 .maxlen         = sizeof(int),
1346                 .mode           = 0644,
1347                 .proc_handler   = proc_dointvec
1348         },
1349 #endif
1350         { .ctl_name = 0 }
1351 };
1352
1353 static struct ctl_table dev_table[] = {
1354         { .ctl_name = 0 }
1355 };
1356
1357 static DEFINE_SPINLOCK(sysctl_lock);
1358
1359 /* called under sysctl_lock */
1360 static int use_table(struct ctl_table_header *p)
1361 {
1362         if (unlikely(p->unregistering))
1363                 return 0;
1364         p->used++;
1365         return 1;
1366 }
1367
1368 /* called under sysctl_lock */
1369 static void unuse_table(struct ctl_table_header *p)
1370 {
1371         if (!--p->used)
1372                 if (unlikely(p->unregistering))
1373                         complete(p->unregistering);
1374 }
1375
1376 /* called under sysctl_lock, will reacquire if has to wait */
1377 static void start_unregistering(struct ctl_table_header *p)
1378 {
1379         /*
1380          * if p->used is 0, nobody will ever touch that entry again;
1381          * we'll eliminate all paths to it before dropping sysctl_lock
1382          */
1383         if (unlikely(p->used)) {
1384                 struct completion wait;
1385                 init_completion(&wait);
1386                 p->unregistering = &wait;
1387                 spin_unlock(&sysctl_lock);
1388                 wait_for_completion(&wait);
1389                 spin_lock(&sysctl_lock);
1390         } else {
1391                 /* anything non-NULL; we'll never dereference it */
1392                 p->unregistering = ERR_PTR(-EINVAL);
1393         }
1394         /*
1395          * do not remove from the list until nobody holds it; walking the
1396          * list in do_sysctl() relies on that.
1397          */
1398         list_del_init(&p->ctl_entry);
1399 }
1400
1401 void sysctl_head_get(struct ctl_table_header *head)
1402 {
1403         spin_lock(&sysctl_lock);
1404         head->count++;
1405         spin_unlock(&sysctl_lock);
1406 }
1407
1408 void sysctl_head_put(struct ctl_table_header *head)
1409 {
1410         spin_lock(&sysctl_lock);
1411         if (!--head->count)
1412                 kfree(head);
1413         spin_unlock(&sysctl_lock);
1414 }
1415
1416 struct ctl_table_header *sysctl_head_grab(struct ctl_table_header *head)
1417 {
1418         if (!head)
1419                 BUG();
1420         spin_lock(&sysctl_lock);
1421         if (!use_table(head))
1422                 head = ERR_PTR(-ENOENT);
1423         spin_unlock(&sysctl_lock);
1424         return head;
1425 }
1426
1427 void sysctl_head_finish(struct ctl_table_header *head)
1428 {
1429         if (!head)
1430                 return;
1431         spin_lock(&sysctl_lock);
1432         unuse_table(head);
1433         spin_unlock(&sysctl_lock);
1434 }
1435
1436 static struct ctl_table_set *
1437 lookup_header_set(struct ctl_table_root *root, struct nsproxy *namespaces)
1438 {
1439         struct ctl_table_set *set = &root->default_set;
1440         if (root->lookup)
1441                 set = root->lookup(root, namespaces);
1442         return set;
1443 }
1444
1445 static struct list_head *
1446 lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces)
1447 {
1448         struct ctl_table_set *set = lookup_header_set(root, namespaces);
1449         return &set->list;
1450 }
1451
1452 struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces,
1453                                             struct ctl_table_header *prev)
1454 {
1455         struct ctl_table_root *root;
1456         struct list_head *header_list;
1457         struct ctl_table_header *head;
1458         struct list_head *tmp;
1459
1460         spin_lock(&sysctl_lock);
1461         if (prev) {
1462                 head = prev;
1463                 tmp = &prev->ctl_entry;
1464                 unuse_table(prev);
1465                 goto next;
1466         }
1467         tmp = &root_table_header.ctl_entry;
1468         for (;;) {
1469                 head = list_entry(tmp, struct ctl_table_header, ctl_entry);
1470
1471                 if (!use_table(head))
1472                         goto next;
1473                 spin_unlock(&sysctl_lock);
1474                 return head;
1475         next:
1476                 root = head->root;
1477                 tmp = tmp->next;
1478                 header_list = lookup_header_list(root, namespaces);
1479                 if (tmp != header_list)
1480                         continue;
1481
1482                 do {
1483                         root = list_entry(root->root_list.next,
1484                                         struct ctl_table_root, root_list);
1485                         if (root == &sysctl_table_root)
1486                                 goto out;
1487                         header_list = lookup_header_list(root, namespaces);
1488                 } while (list_empty(header_list));
1489                 tmp = header_list->next;
1490         }
1491 out:
1492         spin_unlock(&sysctl_lock);
1493         return NULL;
1494 }
1495
1496 struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev)
1497 {
1498         return __sysctl_head_next(current->nsproxy, prev);
1499 }
1500
1501 void register_sysctl_root(struct ctl_table_root *root)
1502 {
1503         spin_lock(&sysctl_lock);
1504         list_add_tail(&root->root_list, &sysctl_table_root.root_list);
1505         spin_unlock(&sysctl_lock);
1506 }
1507
1508 #ifdef CONFIG_SYSCTL_SYSCALL
1509 /* Perform the actual read/write of a sysctl table entry. */
1510 static int do_sysctl_strategy(struct ctl_table_root *root,
1511                         struct ctl_table *table,
1512                         int __user *name, int nlen,
1513                         void __user *oldval, size_t __user *oldlenp,
1514                         void __user *newval, size_t newlen)
1515 {
1516         int op = 0, rc;
1517
1518         if (oldval)
1519                 op |= 004;
1520         if (newval)
1521                 op |= 002;
1522         if (sysctl_perm(root, table, op))
1523                 return -EPERM;
1524
1525         if (table->strategy) {
1526                 rc = table->strategy(table, name, nlen, oldval, oldlenp,
1527                                      newval, newlen);
1528                 if (rc < 0)
1529                         return rc;
1530                 if (rc > 0)
1531                         return 0;
1532         }
1533
1534         /* If there is no strategy routine, or if the strategy returns
1535          * zero, proceed with automatic r/w */
1536         if (table->data && table->maxlen) {
1537                 rc = sysctl_data(table, name, nlen, oldval, oldlenp,
1538                                  newval, newlen);
1539                 if (rc < 0)
1540                         return rc;
1541         }
1542         return 0;
1543 }
1544
1545 static int parse_table(int __user *name, int nlen,
1546                        void __user *oldval, size_t __user *oldlenp,
1547                        void __user *newval, size_t newlen,
1548                        struct ctl_table_root *root,
1549                        struct ctl_table *table)
1550 {
1551         int n;
1552 repeat:
1553         if (!nlen)
1554                 return -ENOTDIR;
1555         if (get_user(n, name))
1556                 return -EFAULT;
1557         for ( ; table->ctl_name || table->procname; table++) {
1558                 if (!table->ctl_name)
1559                         continue;
1560                 if (n == table->ctl_name) {
1561                         int error;
1562                         if (table->child) {
1563                                 if (sysctl_perm(root, table, 001))
1564                                         return -EPERM;
1565                                 name++;
1566                                 nlen--;
1567                                 table = table->child;
1568                                 goto repeat;
1569                         }
1570                         error = do_sysctl_strategy(root, table, name, nlen,
1571                                                    oldval, oldlenp,
1572                                                    newval, newlen);
1573                         return error;
1574                 }
1575         }
1576         return -ENOTDIR;
1577 }
1578
1579 int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp,
1580                void __user *newval, size_t newlen)
1581 {
1582         struct ctl_table_header *head;
1583         int error = -ENOTDIR;
1584
1585         if (nlen <= 0 || nlen >= CTL_MAXNAME)
1586                 return -ENOTDIR;
1587         if (oldval) {
1588                 int old_len;
1589                 if (!oldlenp || get_user(old_len, oldlenp))
1590                         return -EFAULT;
1591         }
1592
1593         for (head = sysctl_head_next(NULL); head;
1594                         head = sysctl_head_next(head)) {
1595                 error = parse_table(name, nlen, oldval, oldlenp, 
1596                                         newval, newlen,
1597                                         head->root, head->ctl_table);
1598                 if (error != -ENOTDIR) {
1599                         sysctl_head_finish(head);
1600                         break;
1601                 }
1602         }
1603         return error;
1604 }
1605
1606 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
1607 {
1608         struct __sysctl_args tmp;
1609         int error;
1610
1611         if (copy_from_user(&tmp, args, sizeof(tmp)))
1612                 return -EFAULT;
1613
1614         error = deprecated_sysctl_warning(&tmp);
1615         if (error)
1616                 goto out;
1617
1618         lock_kernel();
1619         error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp,
1620                           tmp.newval, tmp.newlen);
1621         unlock_kernel();
1622 out:
1623         return error;
1624 }
1625 #endif /* CONFIG_SYSCTL_SYSCALL */
1626
1627 /*
1628  * sysctl_perm does NOT grant the superuser all rights automatically, because
1629  * some sysctl variables are readonly even to root.
1630  */
1631
1632 static int test_perm(int mode, int op)
1633 {
1634         if (!current->euid)
1635                 mode >>= 6;
1636         else if (in_egroup_p(0))
1637                 mode >>= 3;
1638         if ((mode & op & 0007) == op)
1639                 return 0;
1640         return -EACCES;
1641 }
1642
1643 int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op)
1644 {
1645         int error;
1646         int mode;
1647
1648         error = security_sysctl(table, op);
1649         if (error)
1650                 return error;
1651
1652         if (root->permissions)
1653                 mode = root->permissions(root, current->nsproxy, table);
1654         else
1655                 mode = table->mode;
1656
1657         return test_perm(mode, op);
1658 }
1659
1660 static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table)
1661 {
1662         for (; table->ctl_name || table->procname; table++) {
1663                 table->parent = parent;
1664                 if (table->child)
1665                         sysctl_set_parent(table, table->child);
1666         }
1667 }
1668
1669 static __init int sysctl_init(void)
1670 {
1671         sysctl_set_parent(NULL, root_table);
1672 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1673         {
1674                 int err;
1675                 err = sysctl_check_table(current->nsproxy, root_table);
1676         }
1677 #endif
1678         return 0;
1679 }
1680
1681 core_initcall(sysctl_init);
1682
1683 /**
1684  * __register_sysctl_paths - register a sysctl hierarchy
1685  * @root: List of sysctl headers to register on
1686  * @namespaces: Data to compute which lists of sysctl entries are visible
1687  * @path: The path to the directory the sysctl table is in.
1688  * @table: the top-level table structure
1689  *
1690  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1691  * array. A completely 0 filled entry terminates the table.
1692  *
1693  * The members of the &struct ctl_table structure are used as follows:
1694  *
1695  * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1696  *            must be unique within that level of sysctl
1697  *
1698  * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1699  *            enter a sysctl file
1700  *
1701  * data - a pointer to data for use by proc_handler
1702  *
1703  * maxlen - the maximum size in bytes of the data
1704  *
1705  * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1706  *
1707  * child - a pointer to the child sysctl table if this entry is a directory, or
1708  *         %NULL.
1709  *
1710  * proc_handler - the text handler routine (described below)
1711  *
1712  * strategy - the strategy routine (described below)
1713  *
1714  * de - for internal use by the sysctl routines
1715  *
1716  * extra1, extra2 - extra pointers usable by the proc handler routines
1717  *
1718  * Leaf nodes in the sysctl tree will be represented by a single file
1719  * under /proc; non-leaf nodes will be represented by directories.
1720  *
1721  * sysctl(2) can automatically manage read and write requests through
1722  * the sysctl table.  The data and maxlen fields of the ctl_table
1723  * struct enable minimal validation of the values being written to be
1724  * performed, and the mode field allows minimal authentication.
1725  *
1726  * More sophisticated management can be enabled by the provision of a
1727  * strategy routine with the table entry.  This will be called before
1728  * any automatic read or write of the data is performed.
1729  *
1730  * The strategy routine may return
1731  *
1732  * < 0 - Error occurred (error is passed to user process)
1733  *
1734  * 0   - OK - proceed with automatic read or write.
1735  *
1736  * > 0 - OK - read or write has been done by the strategy routine, so
1737  *       return immediately.
1738  *
1739  * There must be a proc_handler routine for any terminal nodes
1740  * mirrored under /proc/sys (non-terminals are handled by a built-in
1741  * directory handler).  Several default handlers are available to
1742  * cover common cases -
1743  *
1744  * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1745  * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(), 
1746  * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1747  *
1748  * It is the handler's job to read the input buffer from user memory
1749  * and process it. The handler should return 0 on success.
1750  *
1751  * This routine returns %NULL on a failure to register, and a pointer
1752  * to the table header on success.
1753  */
1754 struct ctl_table_header *__register_sysctl_paths(
1755         struct ctl_table_root *root,
1756         struct nsproxy *namespaces,
1757         const struct ctl_path *path, struct ctl_table *table)
1758 {
1759         struct ctl_table_header *header;
1760         struct ctl_table *new, **prevp;
1761         unsigned int n, npath;
1762
1763         /* Count the path components */
1764         for (npath = 0; path[npath].ctl_name || path[npath].procname; ++npath)
1765                 ;
1766
1767         /*
1768          * For each path component, allocate a 2-element ctl_table array.
1769          * The first array element will be filled with the sysctl entry
1770          * for this, the second will be the sentinel (ctl_name == 0).
1771          *
1772          * We allocate everything in one go so that we don't have to
1773          * worry about freeing additional memory in unregister_sysctl_table.
1774          */
1775         header = kzalloc(sizeof(struct ctl_table_header) +
1776                          (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL);
1777         if (!header)
1778                 return NULL;
1779
1780         new = (struct ctl_table *) (header + 1);
1781
1782         /* Now connect the dots */
1783         prevp = &header->ctl_table;
1784         for (n = 0; n < npath; ++n, ++path) {
1785                 /* Copy the procname */
1786                 new->procname = path->procname;
1787                 new->ctl_name = path->ctl_name;
1788                 new->mode     = 0555;
1789
1790                 *prevp = new;
1791                 prevp = &new->child;
1792
1793                 new += 2;
1794         }
1795         *prevp = table;
1796         header->ctl_table_arg = table;
1797
1798         INIT_LIST_HEAD(&header->ctl_entry);
1799         header->used = 0;
1800         header->unregistering = NULL;
1801         header->root = root;
1802         sysctl_set_parent(NULL, header->ctl_table);
1803         header->count = 1;
1804 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1805         if (sysctl_check_table(namespaces, header->ctl_table)) {
1806                 kfree(header);
1807                 return NULL;
1808         }
1809 #endif
1810         spin_lock(&sysctl_lock);
1811         header->set = lookup_header_set(root, namespaces);
1812         list_add_tail(&header->ctl_entry, &header->set->list);
1813         spin_unlock(&sysctl_lock);
1814
1815         return header;
1816 }
1817
1818 /**
1819  * register_sysctl_table_path - register a sysctl table hierarchy
1820  * @path: The path to the directory the sysctl table is in.
1821  * @table: the top-level table structure
1822  *
1823  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1824  * array. A completely 0 filled entry terminates the table.
1825  *
1826  * See __register_sysctl_paths for more details.
1827  */
1828 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1829                                                 struct ctl_table *table)
1830 {
1831         return __register_sysctl_paths(&sysctl_table_root, current->nsproxy,
1832                                         path, table);
1833 }
1834
1835 /**
1836  * register_sysctl_table - register a sysctl table hierarchy
1837  * @table: the top-level table structure
1838  *
1839  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1840  * array. A completely 0 filled entry terminates the table.
1841  *
1842  * See register_sysctl_paths for more details.
1843  */
1844 struct ctl_table_header *register_sysctl_table(struct ctl_table *table)
1845 {
1846         static const struct ctl_path null_path[] = { {} };
1847
1848         return register_sysctl_paths(null_path, table);
1849 }
1850
1851 /**
1852  * unregister_sysctl_table - unregister a sysctl table hierarchy
1853  * @header: the header returned from register_sysctl_table
1854  *
1855  * Unregisters the sysctl table and all children. proc entries may not
1856  * actually be removed until they are no longer used by anyone.
1857  */
1858 void unregister_sysctl_table(struct ctl_table_header * header)
1859 {
1860         might_sleep();
1861
1862         if (header == NULL)
1863                 return;
1864
1865         spin_lock(&sysctl_lock);
1866         start_unregistering(header);
1867         if (!--header->count)
1868                 kfree(header);
1869         spin_unlock(&sysctl_lock);
1870 }
1871
1872 void setup_sysctl_set(struct ctl_table_set *p,
1873         struct ctl_table_set *parent,
1874         int (*is_seen)(struct ctl_table_set *))
1875 {
1876         INIT_LIST_HEAD(&p->list);
1877         p->parent = parent ? parent : &sysctl_table_root.default_set;
1878         p->is_seen = is_seen;
1879 }
1880
1881 #else /* !CONFIG_SYSCTL */
1882 struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
1883 {
1884         return NULL;
1885 }
1886
1887 struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1888                                                     struct ctl_table *table)
1889 {
1890         return NULL;
1891 }
1892
1893 void unregister_sysctl_table(struct ctl_table_header * table)
1894 {
1895 }
1896
1897 void setup_sysctl_set(struct ctl_table_set *p,
1898         struct ctl_table_set *parent,
1899         int (*is_seen)(struct ctl_table_set *))
1900 {
1901 }
1902
1903 void sysctl_head_put(struct ctl_table_header *head)
1904 {
1905 }
1906
1907 #endif /* CONFIG_SYSCTL */
1908
1909 /*
1910  * /proc/sys support
1911  */
1912
1913 #ifdef CONFIG_PROC_SYSCTL
1914
1915 static int _proc_do_string(void* data, int maxlen, int write,
1916                            struct file *filp, void __user *buffer,
1917                            size_t *lenp, loff_t *ppos)
1918 {
1919         size_t len;
1920         char __user *p;
1921         char c;
1922
1923         if (!data || !maxlen || !*lenp) {
1924                 *lenp = 0;
1925                 return 0;
1926         }
1927
1928         if (write) {
1929                 len = 0;
1930                 p = buffer;
1931                 while (len < *lenp) {
1932                         if (get_user(c, p++))
1933                                 return -EFAULT;
1934                         if (c == 0 || c == '\n')
1935                                 break;
1936                         len++;
1937                 }
1938                 if (len >= maxlen)
1939                         len = maxlen-1;
1940                 if(copy_from_user(data, buffer, len))
1941                         return -EFAULT;
1942                 ((char *) data)[len] = 0;
1943                 *ppos += *lenp;
1944         } else {
1945                 len = strlen(data);
1946                 if (len > maxlen)
1947                         len = maxlen;
1948
1949                 if (*ppos > len) {
1950                         *lenp = 0;
1951                         return 0;
1952                 }
1953
1954                 data += *ppos;
1955                 len  -= *ppos;
1956
1957                 if (len > *lenp)
1958                         len = *lenp;
1959                 if (len)
1960                         if(copy_to_user(buffer, data, len))
1961                                 return -EFAULT;
1962                 if (len < *lenp) {
1963                         if(put_user('\n', ((char __user *) buffer) + len))
1964                                 return -EFAULT;
1965                         len++;
1966                 }
1967                 *lenp = len;
1968                 *ppos += len;
1969         }
1970         return 0;
1971 }
1972
1973 /**
1974  * proc_dostring - read a string sysctl
1975  * @table: the sysctl table
1976  * @write: %TRUE if this is a write to the sysctl file
1977  * @filp: the file structure
1978  * @buffer: the user buffer
1979  * @lenp: the size of the user buffer
1980  * @ppos: file position
1981  *
1982  * Reads/writes a string from/to the user buffer. If the kernel
1983  * buffer provided is not large enough to hold the string, the
1984  * string is truncated. The copied string is %NULL-terminated.
1985  * If the string is being read by the user process, it is copied
1986  * and a newline '\n' is added. It is truncated if the buffer is
1987  * not large enough.
1988  *
1989  * Returns 0 on success.
1990  */
1991 int proc_dostring(struct ctl_table *table, int write, struct file *filp,
1992                   void __user *buffer, size_t *lenp, loff_t *ppos)
1993 {
1994         return _proc_do_string(table->data, table->maxlen, write, filp,
1995                                buffer, lenp, ppos);
1996 }
1997
1998
1999 static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp,
2000                                  int *valp,
2001                                  int write, void *data)
2002 {
2003         if (write) {
2004                 *valp = *negp ? -*lvalp : *lvalp;
2005         } else {
2006                 int val = *valp;
2007                 if (val < 0) {
2008                         *negp = -1;
2009                         *lvalp = (unsigned long)-val;
2010                 } else {
2011                         *negp = 0;
2012                         *lvalp = (unsigned long)val;
2013                 }
2014         }
2015         return 0;
2016 }
2017
2018 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
2019                   int write, struct file *filp, void __user *buffer,
2020                   size_t *lenp, loff_t *ppos,
2021                   int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2022                               int write, void *data),
2023                   void *data)
2024 {
2025 #define TMPBUFLEN 21
2026         int *i, vleft, first=1, neg, val;
2027         unsigned long lval;
2028         size_t left, len;
2029         
2030         char buf[TMPBUFLEN], *p;
2031         char __user *s = buffer;
2032         
2033         if (!tbl_data || !table->maxlen || !*lenp ||
2034             (*ppos && !write)) {
2035                 *lenp = 0;
2036                 return 0;
2037         }
2038         
2039         i = (int *) tbl_data;
2040         vleft = table->maxlen / sizeof(*i);
2041         left = *lenp;
2042
2043         if (!conv)
2044                 conv = do_proc_dointvec_conv;
2045
2046         for (; left && vleft--; i++, first=0) {
2047                 if (write) {
2048                         while (left) {
2049                                 char c;
2050                                 if (get_user(c, s))
2051                                         return -EFAULT;
2052                                 if (!isspace(c))
2053                                         break;
2054                                 left--;
2055                                 s++;
2056                         }
2057                         if (!left)
2058                                 break;
2059                         neg = 0;
2060                         len = left;
2061                         if (len > sizeof(buf) - 1)
2062                                 len = sizeof(buf) - 1;
2063                         if (copy_from_user(buf, s, len))
2064                                 return -EFAULT;
2065                         buf[len] = 0;
2066                         p = buf;
2067                         if (*p == '-' && left > 1) {
2068                                 neg = 1;
2069                                 p++;
2070                         }
2071                         if (*p < '0' || *p > '9')
2072                                 break;
2073
2074                         lval = simple_strtoul(p, &p, 0);
2075
2076                         len = p-buf;
2077                         if ((len < left) && *p && !isspace(*p))
2078                                 break;
2079                         if (neg)
2080                                 val = -val;
2081                         s += len;
2082                         left -= len;
2083
2084                         if (conv(&neg, &lval, i, 1, data))
2085                                 break;
2086                 } else {
2087                         p = buf;
2088                         if (!first)
2089                                 *p++ = '\t';
2090         
2091                         if (conv(&neg, &lval, i, 0, data))
2092                                 break;
2093
2094                         sprintf(p, "%s%lu", neg ? "-" : "", lval);
2095                         len = strlen(buf);
2096                         if (len > left)
2097                                 len = left;
2098                         if(copy_to_user(s, buf, len))
2099                                 return -EFAULT;
2100                         left -= len;
2101                         s += len;
2102                 }
2103         }
2104
2105         if (!write && !first && left) {
2106                 if(put_user('\n', s))
2107                         return -EFAULT;
2108                 left--, s++;
2109         }
2110         if (write) {
2111                 while (left) {
2112                         char c;
2113                         if (get_user(c, s++))
2114                                 return -EFAULT;
2115                         if (!isspace(c))
2116                                 break;
2117                         left--;
2118                 }
2119         }
2120         if (write && first)
2121                 return -EINVAL;
2122         *lenp -= left;
2123         *ppos += *lenp;
2124         return 0;
2125 #undef TMPBUFLEN
2126 }
2127
2128 static int do_proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2129                   void __user *buffer, size_t *lenp, loff_t *ppos,
2130                   int (*conv)(int *negp, unsigned long *lvalp, int *valp,
2131                               int write, void *data),
2132                   void *data)
2133 {
2134         return __do_proc_dointvec(table->data, table, write, filp,
2135                         buffer, lenp, ppos, conv, data);
2136 }
2137
2138 /**
2139  * proc_dointvec - read a vector of integers
2140  * @table: the sysctl table
2141  * @write: %TRUE if this is a write to the sysctl file
2142  * @filp: the file structure
2143  * @buffer: the user buffer
2144  * @lenp: the size of the user buffer
2145  * @ppos: file position
2146  *
2147  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2148  * values from/to the user buffer, treated as an ASCII string. 
2149  *
2150  * Returns 0 on success.
2151  */
2152 int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2153                      void __user *buffer, size_t *lenp, loff_t *ppos)
2154 {
2155     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2156                             NULL,NULL);
2157 }
2158
2159 #define OP_SET  0
2160 #define OP_AND  1
2161 #define OP_OR   2
2162
2163 static int do_proc_dointvec_bset_conv(int *negp, unsigned long *lvalp,
2164                                       int *valp,
2165                                       int write, void *data)
2166 {
2167         int op = *(int *)data;
2168         if (write) {
2169                 int val = *negp ? -*lvalp : *lvalp;
2170                 switch(op) {
2171                 case OP_SET:    *valp = val; break;
2172                 case OP_AND:    *valp &= val; break;
2173                 case OP_OR:     *valp |= val; break;
2174                 }
2175         } else {
2176                 int val = *valp;
2177                 if (val < 0) {
2178                         *negp = -1;
2179                         *lvalp = (unsigned long)-val;
2180                 } else {
2181                         *negp = 0;
2182                         *lvalp = (unsigned long)val;
2183                 }
2184         }
2185         return 0;
2186 }
2187
2188 /*
2189  *      Taint values can only be increased
2190  */
2191 static int proc_dointvec_taint(struct ctl_table *table, int write, struct file *filp,
2192                                void __user *buffer, size_t *lenp, loff_t *ppos)
2193 {
2194         int op;
2195
2196         if (write && !capable(CAP_SYS_ADMIN))
2197                 return -EPERM;
2198
2199         op = OP_OR;
2200         return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2201                                 do_proc_dointvec_bset_conv,&op);
2202 }
2203
2204 struct do_proc_dointvec_minmax_conv_param {
2205         int *min;
2206         int *max;
2207 };
2208
2209 static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp, 
2210                                         int *valp, 
2211                                         int write, void *data)
2212 {
2213         struct do_proc_dointvec_minmax_conv_param *param = data;
2214         if (write) {
2215                 int val = *negp ? -*lvalp : *lvalp;
2216                 if ((param->min && *param->min > val) ||
2217                     (param->max && *param->max < val))
2218                         return -EINVAL;
2219                 *valp = val;
2220         } else {
2221                 int val = *valp;
2222                 if (val < 0) {
2223                         *negp = -1;
2224                         *lvalp = (unsigned long)-val;
2225                 } else {
2226                         *negp = 0;
2227                         *lvalp = (unsigned long)val;
2228                 }
2229         }
2230         return 0;
2231 }
2232
2233 /**
2234  * proc_dointvec_minmax - read a vector of integers with min/max values
2235  * @table: the sysctl table
2236  * @write: %TRUE if this is a write to the sysctl file
2237  * @filp: the file structure
2238  * @buffer: the user buffer
2239  * @lenp: the size of the user buffer
2240  * @ppos: file position
2241  *
2242  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2243  * values from/to the user buffer, treated as an ASCII string.
2244  *
2245  * This routine will ensure the values are within the range specified by
2246  * table->extra1 (min) and table->extra2 (max).
2247  *
2248  * Returns 0 on success.
2249  */
2250 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
2251                   void __user *buffer, size_t *lenp, loff_t *ppos)
2252 {
2253         struct do_proc_dointvec_minmax_conv_param param = {
2254                 .min = (int *) table->extra1,
2255                 .max = (int *) table->extra2,
2256         };
2257         return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2258                                 do_proc_dointvec_minmax_conv, &param);
2259 }
2260
2261 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2262                                      struct file *filp,
2263                                      void __user *buffer,
2264                                      size_t *lenp, loff_t *ppos,
2265                                      unsigned long convmul,
2266                                      unsigned long convdiv)
2267 {
2268 #define TMPBUFLEN 21
2269         unsigned long *i, *min, *max, val;
2270         int vleft, first=1, neg;
2271         size_t len, left;
2272         char buf[TMPBUFLEN], *p;
2273         char __user *s = buffer;
2274         
2275         if (!data || !table->maxlen || !*lenp ||
2276             (*ppos && !write)) {
2277                 *lenp = 0;
2278                 return 0;
2279         }
2280         
2281         i = (unsigned long *) data;
2282         min = (unsigned long *) table->extra1;
2283         max = (unsigned long *) table->extra2;
2284         vleft = table->maxlen / sizeof(unsigned long);
2285         left = *lenp;
2286         
2287         for (; left && vleft--; i++, min++, max++, first=0) {
2288                 if (write) {
2289                         while (left) {
2290                                 char c;
2291                                 if (get_user(c, s))
2292                                         return -EFAULT;
2293                                 if (!isspace(c))
2294                                         break;
2295                                 left--;
2296                                 s++;
2297                         }
2298                         if (!left)
2299                                 break;
2300                         neg = 0;
2301                         len = left;
2302                         if (len > TMPBUFLEN-1)
2303                                 len = TMPBUFLEN-1;
2304                         if (copy_from_user(buf, s, len))
2305                                 return -EFAULT;
2306                         buf[len] = 0;
2307                         p = buf;
2308                         if (*p == '-' && left > 1) {
2309                                 neg = 1;
2310                                 p++;
2311                         }
2312                         if (*p < '0' || *p > '9')
2313                                 break;
2314                         val = simple_strtoul(p, &p, 0) * convmul / convdiv ;
2315                         len = p-buf;
2316                         if ((len < left) && *p && !isspace(*p))
2317                                 break;
2318                         if (neg)
2319                                 val = -val;
2320                         s += len;
2321                         left -= len;
2322
2323                         if(neg)
2324                                 continue;
2325                         if ((min && val < *min) || (max && val > *max))
2326                                 continue;
2327                         *i = val;
2328                 } else {
2329                         p = buf;
2330                         if (!first)
2331                                 *p++ = '\t';
2332                         sprintf(p, "%lu", convdiv * (*i) / convmul);
2333                         len = strlen(buf);
2334                         if (len > left)
2335                                 len = left;
2336                         if(copy_to_user(s, buf, len))
2337                                 return -EFAULT;
2338                         left -= len;
2339                         s += len;
2340                 }
2341         }
2342
2343         if (!write && !first && left) {
2344                 if(put_user('\n', s))
2345                         return -EFAULT;
2346                 left--, s++;
2347         }
2348         if (write) {
2349                 while (left) {
2350                         char c;
2351                         if (get_user(c, s++))
2352                                 return -EFAULT;
2353                         if (!isspace(c))
2354                                 break;
2355                         left--;
2356                 }
2357         }
2358         if (write && first)
2359                 return -EINVAL;
2360         *lenp -= left;
2361         *ppos += *lenp;
2362         return 0;
2363 #undef TMPBUFLEN
2364 }
2365
2366 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2367                                      struct file *filp,
2368                                      void __user *buffer,
2369                                      size_t *lenp, loff_t *ppos,
2370                                      unsigned long convmul,
2371                                      unsigned long convdiv)
2372 {
2373         return __do_proc_doulongvec_minmax(table->data, table, write,
2374                         filp, buffer, lenp, ppos, convmul, convdiv);
2375 }
2376
2377 /**
2378  * proc_doulongvec_minmax - read a vector of long integers with min/max values
2379  * @table: the sysctl table
2380  * @write: %TRUE if this is a write to the sysctl file
2381  * @filp: the file structure
2382  * @buffer: the user buffer
2383  * @lenp: the size of the user buffer
2384  * @ppos: file position
2385  *
2386  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2387  * values from/to the user buffer, treated as an ASCII string.
2388  *
2389  * This routine will ensure the values are within the range specified by
2390  * table->extra1 (min) and table->extra2 (max).
2391  *
2392  * Returns 0 on success.
2393  */
2394 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
2395                            void __user *buffer, size_t *lenp, loff_t *ppos)
2396 {
2397     return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l);
2398 }
2399
2400 /**
2401  * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2402  * @table: the sysctl table
2403  * @write: %TRUE if this is a write to the sysctl file
2404  * @filp: the file structure
2405  * @buffer: the user buffer
2406  * @lenp: the size of the user buffer
2407  * @ppos: file position
2408  *
2409  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2410  * values from/to the user buffer, treated as an ASCII string. The values
2411  * are treated as milliseconds, and converted to jiffies when they are stored.
2412  *
2413  * This routine will ensure the values are within the range specified by
2414  * table->extra1 (min) and table->extra2 (max).
2415  *
2416  * Returns 0 on success.
2417  */
2418 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2419                                       struct file *filp,
2420                                       void __user *buffer,
2421                                       size_t *lenp, loff_t *ppos)
2422 {
2423     return do_proc_doulongvec_minmax(table, write, filp, buffer,
2424                                      lenp, ppos, HZ, 1000l);
2425 }
2426
2427
2428 static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp,
2429                                          int *valp,
2430                                          int write, void *data)
2431 {
2432         if (write) {
2433                 if (*lvalp > LONG_MAX / HZ)
2434                         return 1;
2435                 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2436         } else {
2437                 int val = *valp;
2438                 unsigned long lval;
2439                 if (val < 0) {
2440                         *negp = -1;
2441                         lval = (unsigned long)-val;
2442                 } else {
2443                         *negp = 0;
2444                         lval = (unsigned long)val;
2445                 }
2446                 *lvalp = lval / HZ;
2447         }
2448         return 0;
2449 }
2450
2451 static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp,
2452                                                 int *valp,
2453                                                 int write, void *data)
2454 {
2455         if (write) {
2456                 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2457                         return 1;
2458                 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2459         } else {
2460                 int val = *valp;
2461                 unsigned long lval;
2462                 if (val < 0) {
2463                         *negp = -1;
2464                         lval = (unsigned long)-val;
2465                 } else {
2466                         *negp = 0;
2467                         lval = (unsigned long)val;
2468                 }
2469                 *lvalp = jiffies_to_clock_t(lval);
2470         }
2471         return 0;
2472 }
2473
2474 static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp,
2475                                             int *valp,
2476                                             int write, void *data)
2477 {
2478         if (write) {
2479                 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2480         } else {
2481                 int val = *valp;
2482                 unsigned long lval;
2483                 if (val < 0) {
2484                         *negp = -1;
2485                         lval = (unsigned long)-val;
2486                 } else {
2487                         *negp = 0;
2488                         lval = (unsigned long)val;
2489                 }
2490                 *lvalp = jiffies_to_msecs(lval);
2491         }
2492         return 0;
2493 }
2494
2495 /**
2496  * proc_dointvec_jiffies - read a vector of integers as seconds
2497  * @table: the sysctl table
2498  * @write: %TRUE if this is a write to the sysctl file
2499  * @filp: the file structure
2500  * @buffer: the user buffer
2501  * @lenp: the size of the user buffer
2502  * @ppos: file position
2503  *
2504  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2505  * values from/to the user buffer, treated as an ASCII string. 
2506  * The values read are assumed to be in seconds, and are converted into
2507  * jiffies.
2508  *
2509  * Returns 0 on success.
2510  */
2511 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
2512                           void __user *buffer, size_t *lenp, loff_t *ppos)
2513 {
2514     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2515                             do_proc_dointvec_jiffies_conv,NULL);
2516 }
2517
2518 /**
2519  * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2520  * @table: the sysctl table
2521  * @write: %TRUE if this is a write to the sysctl file
2522  * @filp: the file structure
2523  * @buffer: the user buffer
2524  * @lenp: the size of the user buffer
2525  * @ppos: pointer to the file position
2526  *
2527  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2528  * values from/to the user buffer, treated as an ASCII string. 
2529  * The values read are assumed to be in 1/USER_HZ seconds, and 
2530  * are converted into jiffies.
2531  *
2532  * Returns 0 on success.
2533  */
2534 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
2535                                  void __user *buffer, size_t *lenp, loff_t *ppos)
2536 {
2537     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2538                             do_proc_dointvec_userhz_jiffies_conv,NULL);
2539 }
2540
2541 /**
2542  * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2543  * @table: the sysctl table
2544  * @write: %TRUE if this is a write to the sysctl file
2545  * @filp: the file structure
2546  * @buffer: the user buffer
2547  * @lenp: the size of the user buffer
2548  * @ppos: file position
2549  * @ppos: the current position in the file
2550  *
2551  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2552  * values from/to the user buffer, treated as an ASCII string. 
2553  * The values read are assumed to be in 1/1000 seconds, and 
2554  * are converted into jiffies.
2555  *
2556  * Returns 0 on success.
2557  */
2558 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
2559                              void __user *buffer, size_t *lenp, loff_t *ppos)
2560 {
2561         return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2562                                 do_proc_dointvec_ms_jiffies_conv, NULL);
2563 }
2564
2565 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
2566                            void __user *buffer, size_t *lenp, loff_t *ppos)
2567 {
2568         struct pid *new_pid;
2569         pid_t tmp;
2570         int r;
2571
2572         tmp = pid_vnr(cad_pid);
2573
2574         r = __do_proc_dointvec(&tmp, table, write, filp, buffer,
2575                                lenp, ppos, NULL, NULL);
2576         if (r || !write)
2577                 return r;
2578
2579         new_pid = find_get_pid(tmp);
2580         if (!new_pid)
2581                 return -ESRCH;
2582
2583         put_pid(xchg(&cad_pid, new_pid));
2584         return 0;
2585 }
2586
2587 #else /* CONFIG_PROC_FS */
2588
2589 int proc_dostring(struct ctl_table *table, int write, struct file *filp,
2590                   void __user *buffer, size_t *lenp, loff_t *ppos)
2591 {
2592         return -ENOSYS;
2593 }
2594
2595 int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2596                   void __user *buffer, size_t *lenp, loff_t *ppos)
2597 {
2598         return -ENOSYS;
2599 }
2600
2601 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
2602                     void __user *buffer, size_t *lenp, loff_t *ppos)
2603 {
2604         return -ENOSYS;
2605 }
2606
2607 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
2608                     void __user *buffer, size_t *lenp, loff_t *ppos)
2609 {
2610         return -ENOSYS;
2611 }
2612
2613 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
2614                     void __user *buffer, size_t *lenp, loff_t *ppos)
2615 {
2616         return -ENOSYS;
2617 }
2618
2619 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
2620                              void __user *buffer, size_t *lenp, loff_t *ppos)
2621 {
2622         return -ENOSYS;
2623 }
2624
2625 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
2626                     void __user *buffer, size_t *lenp, loff_t *ppos)
2627 {
2628         return -ENOSYS;
2629 }
2630
2631 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2632                                       struct file *filp,
2633                                       void __user *buffer,
2634                                       size_t *lenp, loff_t *ppos)
2635 {
2636     return -ENOSYS;
2637 }
2638
2639
2640 #endif /* CONFIG_PROC_FS */
2641
2642
2643 #ifdef CONFIG_SYSCTL_SYSCALL
2644 /*
2645  * General sysctl support routines 
2646  */
2647
2648 /* The generic sysctl data routine (used if no strategy routine supplied) */
2649 int sysctl_data(struct ctl_table *table, int __user *name, int nlen,
2650                 void __user *oldval, size_t __user *oldlenp,
2651                 void __user *newval, size_t newlen)
2652 {
2653         size_t len;
2654
2655         /* Get out of I don't have a variable */
2656         if (!table->data || !table->maxlen)
2657                 return -ENOTDIR;
2658
2659         if (oldval && oldlenp) {
2660                 if (get_user(len, oldlenp))
2661                         return -EFAULT;
2662                 if (len) {
2663                         if (len > table->maxlen)
2664                                 len = table->maxlen;
2665                         if (copy_to_user(oldval, table->data, len))
2666                                 return -EFAULT;
2667                         if (put_user(len, oldlenp))
2668                                 return -EFAULT;
2669                 }
2670         }
2671
2672         if (newval && newlen) {
2673                 if (newlen > table->maxlen)
2674                         newlen = table->maxlen;
2675
2676                 if (copy_from_user(table->data, newval, newlen))
2677                         return -EFAULT;
2678         }
2679         return 1;
2680 }
2681
2682 /* The generic string strategy routine: */
2683 int sysctl_string(struct ctl_table *table, int __user *name, int nlen,
2684                   void __user *oldval, size_t __user *oldlenp,
2685                   void __user *newval, size_t newlen)
2686 {
2687         if (!table->data || !table->maxlen) 
2688                 return -ENOTDIR;
2689         
2690         if (oldval && oldlenp) {
2691                 size_t bufsize;
2692                 if (get_user(bufsize, oldlenp))
2693                         return -EFAULT;
2694                 if (bufsize) {
2695                         size_t len = strlen(table->data), copied;
2696
2697                         /* This shouldn't trigger for a well-formed sysctl */
2698                         if (len > table->maxlen)
2699                                 len = table->maxlen;
2700
2701                         /* Copy up to a max of bufsize-1 bytes of the string */
2702                         copied = (len >= bufsize) ? bufsize - 1 : len;
2703
2704                         if (copy_to_user(oldval, table->data, copied) ||
2705                             put_user(0, (char __user *)(oldval + copied)))
2706                                 return -EFAULT;
2707                         if (put_user(len, oldlenp))
2708                                 return -EFAULT;
2709                 }
2710         }
2711         if (newval && newlen) {
2712                 size_t len = newlen;
2713                 if (len > table->maxlen)
2714                         len = table->maxlen;
2715                 if(copy_from_user(table->data, newval, len))
2716                         return -EFAULT;
2717                 if (len == table->maxlen)
2718                         len--;
2719                 ((char *) table->data)[len] = 0;
2720         }
2721         return 1;
2722 }
2723
2724 /*
2725  * This function makes sure that all of the integers in the vector
2726  * are between the minimum and maximum values given in the arrays
2727  * table->extra1 and table->extra2, respectively.
2728  */
2729 int sysctl_intvec(struct ctl_table *table, int __user *name, int nlen,
2730                 void __user *oldval, size_t __user *oldlenp,
2731                 void __user *newval, size_t newlen)
2732 {
2733
2734         if (newval && newlen) {
2735                 int __user *vec = (int __user *) newval;
2736                 int *min = (int *) table->extra1;
2737                 int *max = (int *) table->extra2;
2738                 size_t length;
2739                 int i;
2740
2741                 if (newlen % sizeof(int) != 0)
2742                         return -EINVAL;
2743
2744                 if (!table->extra1 && !table->extra2)
2745                         return 0;
2746
2747                 if (newlen > table->maxlen)
2748                         newlen = table->maxlen;
2749                 length = newlen / sizeof(int);
2750
2751                 for (i = 0; i < length; i++) {
2752                         int value;
2753                         if (get_user(value, vec + i))
2754                                 return -EFAULT;
2755                         if (min && value < min[i])
2756                                 return -EINVAL;
2757                         if (max && value > max[i])
2758                                 return -EINVAL;
2759                 }
2760         }
2761         return 0;
2762 }
2763
2764 /* Strategy function to convert jiffies to seconds */ 
2765 int sysctl_jiffies(struct ctl_table *table, int __user *name, int nlen,
2766                 void __user *oldval, size_t __user *oldlenp,
2767                 void __user *newval, size_t newlen)
2768 {
2769         if (oldval && oldlenp) {
2770                 size_t olen;
2771
2772                 if (get_user(olen, oldlenp))
2773                         return -EFAULT;
2774                 if (olen) {
2775                         int val;
2776
2777                         if (olen < sizeof(int))
2778                                 return -EINVAL;
2779
2780                         val = *(int *)(table->data) / HZ;
2781                         if (put_user(val, (int __user *)oldval))
2782                                 return -EFAULT;
2783                         if (put_user(sizeof(int), oldlenp))
2784                                 return -EFAULT;
2785                 }
2786         }
2787         if (newval && newlen) { 
2788                 int new;
2789                 if (newlen != sizeof(int))
2790                         return -EINVAL; 
2791                 if (get_user(new, (int __user *)newval))
2792                         return -EFAULT;
2793                 *(int *)(table->data) = new*HZ; 
2794         }
2795         return 1;
2796 }
2797
2798 /* Strategy function to convert jiffies to seconds */ 
2799 int sysctl_ms_jiffies(struct ctl_table *table, int __user *name, int nlen,
2800                 void __user *oldval, size_t __user *oldlenp,
2801                 void __user *newval, size_t newlen)
2802 {
2803         if (oldval && oldlenp) {
2804                 size_t olen;
2805
2806                 if (get_user(olen, oldlenp))
2807                         return -EFAULT;
2808                 if (olen) {
2809                         int val;
2810
2811                         if (olen < sizeof(int))
2812                                 return -EINVAL;
2813
2814                         val = jiffies_to_msecs(*(int *)(table->data));
2815                         if (put_user(val, (int __user *)oldval))
2816                                 return -EFAULT;
2817                         if (put_user(sizeof(int), oldlenp))
2818                                 return -EFAULT;
2819                 }
2820         }
2821         if (newval && newlen) { 
2822                 int new;
2823                 if (newlen != sizeof(int))
2824                         return -EINVAL; 
2825                 if (get_user(new, (int __user *)newval))
2826                         return -EFAULT;
2827                 *(int *)(table->data) = msecs_to_jiffies(new);
2828         }
2829         return 1;
2830 }
2831
2832
2833
2834 #else /* CONFIG_SYSCTL_SYSCALL */
2835
2836
2837 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
2838 {
2839         struct __sysctl_args tmp;
2840         int error;
2841
2842         if (copy_from_user(&tmp, args, sizeof(tmp)))
2843                 return -EFAULT;
2844
2845         error = deprecated_sysctl_warning(&tmp);
2846
2847         /* If no error reading the parameters then just -ENOSYS ... */
2848         if (!error)
2849                 error = -ENOSYS;
2850
2851         return error;
2852 }
2853
2854 int sysctl_data(struct ctl_table *table, int __user *name, int nlen,
2855                   void __user *oldval, size_t __user *oldlenp,
2856                   void __user *newval, size_t newlen)
2857 {
2858         return -ENOSYS;
2859 }
2860
2861 int sysctl_string(struct ctl_table *table, int __user *name, int nlen,
2862                   void __user *oldval, size_t __user *oldlenp,
2863                   void __user *newval, size_t newlen)
2864 {
2865         return -ENOSYS;
2866 }
2867
2868 int sysctl_intvec(struct ctl_table *table, int __user *name, int nlen,
2869                 void __user *oldval, size_t __user *oldlenp,
2870                 void __user *newval, size_t newlen)
2871 {
2872         return -ENOSYS;
2873 }
2874
2875 int sysctl_jiffies(struct ctl_table *table, int __user *name, int nlen,
2876                 void __user *oldval, size_t __user *oldlenp,
2877                 void __user *newval, size_t newlen)
2878 {
2879         return -ENOSYS;
2880 }
2881
2882 int sysctl_ms_jiffies(struct ctl_table *table, int __user *name, int nlen,
2883                 void __user *oldval, size_t __user *oldlenp,
2884                 void __user *newval, size_t newlen)
2885 {
2886         return -ENOSYS;
2887 }
2888
2889 #endif /* CONFIG_SYSCTL_SYSCALL */
2890
2891 static int deprecated_sysctl_warning(struct __sysctl_args *args)
2892 {
2893         static int msg_count;
2894         int name[CTL_MAXNAME];
2895         int i;
2896
2897         /* Check args->nlen. */
2898         if (args->nlen < 0 || args->nlen > CTL_MAXNAME)
2899                 return -ENOTDIR;
2900
2901         /* Read in the sysctl name for better debug message logging */
2902         for (i = 0; i < args->nlen; i++)
2903                 if (get_user(name[i], args->name + i))
2904                         return -EFAULT;
2905
2906         /* Ignore accesses to kernel.version */
2907         if ((args->nlen == 2) && (name[0] == CTL_KERN) && (name[1] == KERN_VERSION))
2908                 return 0;
2909
2910         if (msg_count < 5) {
2911                 msg_count++;
2912                 printk(KERN_INFO
2913                         "warning: process `%s' used the deprecated sysctl "
2914                         "system call with ", current->comm);
2915                 for (i = 0; i < args->nlen; i++)
2916                         printk("%d.", name[i]);
2917                 printk("\n");
2918         }
2919         return 0;
2920 }
2921
2922 /*
2923  * No sense putting this after each symbol definition, twice,
2924  * exception granted :-)
2925  */
2926 EXPORT_SYMBOL(proc_dointvec);
2927 EXPORT_SYMBOL(proc_dointvec_jiffies);
2928 EXPORT_SYMBOL(proc_dointvec_minmax);
2929 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2930 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2931 EXPORT_SYMBOL(proc_dostring);
2932 EXPORT_SYMBOL(proc_doulongvec_minmax);
2933 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
2934 EXPORT_SYMBOL(register_sysctl_table);
2935 EXPORT_SYMBOL(register_sysctl_paths);
2936 EXPORT_SYMBOL(sysctl_intvec);
2937 EXPORT_SYMBOL(sysctl_jiffies);
2938 EXPORT_SYMBOL(sysctl_ms_jiffies);
2939 EXPORT_SYMBOL(sysctl_string);
2940 EXPORT_SYMBOL(sysctl_data);
2941 EXPORT_SYMBOL(unregister_sysctl_table);