sysctl core: Stop using the unnecessary ctl_table typedef
[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/capability.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/security.h>
41 #include <linux/initrd.h>
42 #include <linux/times.h>
43 #include <linux/limits.h>
44 #include <linux/dcache.h>
45 #include <linux/syscalls.h>
46 #include <linux/nfs_fs.h>
47 #include <linux/acpi.h>
48 #include <linux/reboot.h>
49
50 #include <asm/uaccess.h>
51 #include <asm/processor.h>
52
53 #ifdef CONFIG_X86
54 #include <asm/nmi.h>
55 #include <asm/stacktrace.h>
56 #endif
57
58 #if defined(CONFIG_SYSCTL)
59
60 /* External variables not in a header file. */
61 extern int C_A_D;
62 extern int print_fatal_signals;
63 extern int sysctl_overcommit_memory;
64 extern int sysctl_overcommit_ratio;
65 extern int sysctl_panic_on_oom;
66 extern int sysctl_oom_kill_allocating_task;
67 extern int max_threads;
68 extern int core_uses_pid;
69 extern int suid_dumpable;
70 extern char core_pattern[];
71 extern int pid_max;
72 extern int min_free_kbytes;
73 extern int printk_ratelimit_jiffies;
74 extern int printk_ratelimit_burst;
75 extern int pid_max_min, pid_max_max;
76 extern int sysctl_drop_caches;
77 extern int percpu_pagelist_fraction;
78 extern int compat_log;
79 extern int maps_protect;
80 extern int sysctl_stat_interval;
81 extern int audit_argv_kb;
82
83 /* Constants used for minimum and  maximum */
84 #ifdef CONFIG_DETECT_SOFTLOCKUP
85 static int one = 1;
86 static int sixty = 60;
87 #endif
88
89 #ifdef CONFIG_MMU
90 static int two = 2;
91 #endif
92
93 static int zero;
94 static int one_hundred = 100;
95
96 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
97 static int maxolduid = 65535;
98 static int minolduid;
99 static int min_percpu_pagelist_fract = 8;
100
101 static int ngroups_max = NGROUPS_MAX;
102
103 #ifdef CONFIG_KMOD
104 extern char modprobe_path[];
105 #endif
106 #ifdef CONFIG_CHR_DEV_SG
107 extern int sg_big_buff;
108 #endif
109
110 #ifdef __sparc__
111 extern char reboot_command [];
112 extern int stop_a_enabled;
113 extern int scons_pwroff;
114 #endif
115
116 #ifdef __hppa__
117 extern int pwrsw_enabled;
118 extern int unaligned_enabled;
119 #endif
120
121 #ifdef CONFIG_S390
122 #ifdef CONFIG_MATHEMU
123 extern int sysctl_ieee_emulation_warnings;
124 #endif
125 extern int sysctl_userprocess_debug;
126 extern int spin_retry;
127 #endif
128
129 extern int sysctl_hz_timer;
130
131 #ifdef CONFIG_BSD_PROCESS_ACCT
132 extern int acct_parm[];
133 #endif
134
135 #ifdef CONFIG_IA64
136 extern int no_unaligned_warning;
137 #endif
138
139 #ifdef CONFIG_RT_MUTEXES
140 extern int max_lock_depth;
141 #endif
142
143 #ifdef CONFIG_SYSCTL_SYSCALL
144 static int parse_table(int __user *, int, void __user *, size_t __user *,
145                 void __user *, size_t, struct ctl_table *);
146 #endif
147
148
149 #ifdef CONFIG_PROC_SYSCTL
150 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
151                   void __user *buffer, size_t *lenp, loff_t *ppos);
152 static int proc_dointvec_taint(struct ctl_table *table, int write, struct file *filp,
153                                void __user *buffer, size_t *lenp, loff_t *ppos);
154 #endif
155
156 static struct ctl_table root_table[];
157 static struct ctl_table_header root_table_header =
158         { root_table, LIST_HEAD_INIT(root_table_header.ctl_entry) };
159
160 static struct ctl_table kern_table[];
161 static struct ctl_table vm_table[];
162 static struct ctl_table fs_table[];
163 static struct ctl_table debug_table[];
164 static struct ctl_table dev_table[];
165 extern struct ctl_table random_table[];
166 #ifdef CONFIG_UNIX98_PTYS
167 extern struct ctl_table pty_table[];
168 #endif
169 #ifdef CONFIG_INOTIFY_USER
170 extern struct ctl_table inotify_table[];
171 #endif
172
173 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
174 int sysctl_legacy_va_layout;
175 #endif
176
177 extern int prove_locking;
178 extern int lock_stat;
179
180 /* The default sysctl tables: */
181
182 static struct ctl_table root_table[] = {
183         {
184                 .ctl_name       = CTL_KERN,
185                 .procname       = "kernel",
186                 .mode           = 0555,
187                 .child          = kern_table,
188         },
189         {
190                 .ctl_name       = CTL_VM,
191                 .procname       = "vm",
192                 .mode           = 0555,
193                 .child          = vm_table,
194         },
195 #ifdef CONFIG_NET
196         {
197                 .ctl_name       = CTL_NET,
198                 .procname       = "net",
199                 .mode           = 0555,
200                 .child          = net_table,
201         },
202 #endif
203         {
204                 .ctl_name       = CTL_FS,
205                 .procname       = "fs",
206                 .mode           = 0555,
207                 .child          = fs_table,
208         },
209         {
210                 .ctl_name       = CTL_DEBUG,
211                 .procname       = "debug",
212                 .mode           = 0555,
213                 .child          = debug_table,
214         },
215         {
216                 .ctl_name       = CTL_DEV,
217                 .procname       = "dev",
218                 .mode           = 0555,
219                 .child          = dev_table,
220         },
221 /*
222  * NOTE: do not add new entries to this table unless you have read
223  * Documentation/sysctl/ctl_unnumbered.txt
224  */
225         { .ctl_name = 0 }
226 };
227
228 #ifdef CONFIG_SCHED_DEBUG
229 static unsigned long min_sched_granularity_ns = 100000;         /* 100 usecs */
230 static unsigned long max_sched_granularity_ns = 1000000000;     /* 1 second */
231 static unsigned long min_wakeup_granularity_ns;                 /* 0 usecs */
232 static unsigned long max_wakeup_granularity_ns = 1000000000;    /* 1 second */
233 #endif
234
235 static struct ctl_table kern_table[] = {
236 #ifdef CONFIG_SCHED_DEBUG
237         {
238                 .ctl_name       = CTL_UNNUMBERED,
239                 .procname       = "sched_nr_latency",
240                 .data           = &sysctl_sched_nr_latency,
241                 .maxlen         = sizeof(unsigned int),
242                 .mode           = 0644,
243                 .proc_handler   = &proc_dointvec,
244         },
245         {
246                 .ctl_name       = CTL_UNNUMBERED,
247                 .procname       = "sched_latency_ns",
248                 .data           = &sysctl_sched_latency,
249                 .maxlen         = sizeof(unsigned int),
250                 .mode           = 0644,
251                 .proc_handler   = &proc_dointvec_minmax,
252                 .strategy       = &sysctl_intvec,
253                 .extra1         = &min_sched_granularity_ns,
254                 .extra2         = &max_sched_granularity_ns,
255         },
256         {
257                 .ctl_name       = CTL_UNNUMBERED,
258                 .procname       = "sched_wakeup_granularity_ns",
259                 .data           = &sysctl_sched_wakeup_granularity,
260                 .maxlen         = sizeof(unsigned int),
261                 .mode           = 0644,
262                 .proc_handler   = &proc_dointvec_minmax,
263                 .strategy       = &sysctl_intvec,
264                 .extra1         = &min_wakeup_granularity_ns,
265                 .extra2         = &max_wakeup_granularity_ns,
266         },
267         {
268                 .ctl_name       = CTL_UNNUMBERED,
269                 .procname       = "sched_batch_wakeup_granularity_ns",
270                 .data           = &sysctl_sched_batch_wakeup_granularity,
271                 .maxlen         = sizeof(unsigned int),
272                 .mode           = 0644,
273                 .proc_handler   = &proc_dointvec_minmax,
274                 .strategy       = &sysctl_intvec,
275                 .extra1         = &min_wakeup_granularity_ns,
276                 .extra2         = &max_wakeup_granularity_ns,
277         },
278         {
279                 .ctl_name       = CTL_UNNUMBERED,
280                 .procname       = "sched_child_runs_first",
281                 .data           = &sysctl_sched_child_runs_first,
282                 .maxlen         = sizeof(unsigned int),
283                 .mode           = 0644,
284                 .proc_handler   = &proc_dointvec,
285         },
286         {
287                 .ctl_name       = CTL_UNNUMBERED,
288                 .procname       = "sched_features",
289                 .data           = &sysctl_sched_features,
290                 .maxlen         = sizeof(unsigned int),
291                 .mode           = 0644,
292                 .proc_handler   = &proc_dointvec,
293         },
294         {
295                 .ctl_name       = CTL_UNNUMBERED,
296                 .procname       = "sched_migration_cost",
297                 .data           = &sysctl_sched_migration_cost,
298                 .maxlen         = sizeof(unsigned int),
299                 .mode           = 0644,
300                 .proc_handler   = &proc_dointvec,
301         },
302 #endif
303         {
304                 .ctl_name       = CTL_UNNUMBERED,
305                 .procname       = "sched_compat_yield",
306                 .data           = &sysctl_sched_compat_yield,
307                 .maxlen         = sizeof(unsigned int),
308                 .mode           = 0644,
309                 .proc_handler   = &proc_dointvec,
310         },
311 #ifdef CONFIG_PROVE_LOCKING
312         {
313                 .ctl_name       = CTL_UNNUMBERED,
314                 .procname       = "prove_locking",
315                 .data           = &prove_locking,
316                 .maxlen         = sizeof(int),
317                 .mode           = 0644,
318                 .proc_handler   = &proc_dointvec,
319         },
320 #endif
321 #ifdef CONFIG_LOCK_STAT
322         {
323                 .ctl_name       = CTL_UNNUMBERED,
324                 .procname       = "lock_stat",
325                 .data           = &lock_stat,
326                 .maxlen         = sizeof(int),
327                 .mode           = 0644,
328                 .proc_handler   = &proc_dointvec,
329         },
330 #endif
331         {
332                 .ctl_name       = KERN_PANIC,
333                 .procname       = "panic",
334                 .data           = &panic_timeout,
335                 .maxlen         = sizeof(int),
336                 .mode           = 0644,
337                 .proc_handler   = &proc_dointvec,
338         },
339         {
340                 .ctl_name       = KERN_CORE_USES_PID,
341                 .procname       = "core_uses_pid",
342                 .data           = &core_uses_pid,
343                 .maxlen         = sizeof(int),
344                 .mode           = 0644,
345                 .proc_handler   = &proc_dointvec,
346         },
347 #ifdef CONFIG_AUDITSYSCALL
348         {
349                 .ctl_name       = CTL_UNNUMBERED,
350                 .procname       = "audit_argv_kb",
351                 .data           = &audit_argv_kb,
352                 .maxlen         = sizeof(int),
353                 .mode           = 0644,
354                 .proc_handler   = &proc_dointvec,
355         },
356 #endif
357         {
358                 .ctl_name       = KERN_CORE_PATTERN,
359                 .procname       = "core_pattern",
360                 .data           = core_pattern,
361                 .maxlen         = CORENAME_MAX_SIZE,
362                 .mode           = 0644,
363                 .proc_handler   = &proc_dostring,
364                 .strategy       = &sysctl_string,
365         },
366 #ifdef CONFIG_PROC_SYSCTL
367         {
368                 .ctl_name       = KERN_TAINTED,
369                 .procname       = "tainted",
370                 .data           = &tainted,
371                 .maxlen         = sizeof(int),
372                 .mode           = 0644,
373                 .proc_handler   = &proc_dointvec_taint,
374         },
375 #endif
376         {
377                 .ctl_name       = KERN_CAP_BSET,
378                 .procname       = "cap-bound",
379                 .data           = &cap_bset,
380                 .maxlen         = sizeof(kernel_cap_t),
381                 .mode           = 0600,
382                 .proc_handler   = &proc_dointvec_bset,
383         },
384 #ifdef CONFIG_BLK_DEV_INITRD
385         {
386                 .ctl_name       = KERN_REALROOTDEV,
387                 .procname       = "real-root-dev",
388                 .data           = &real_root_dev,
389                 .maxlen         = sizeof(int),
390                 .mode           = 0644,
391                 .proc_handler   = &proc_dointvec,
392         },
393 #endif
394         {
395                 .ctl_name       = CTL_UNNUMBERED,
396                 .procname       = "print-fatal-signals",
397                 .data           = &print_fatal_signals,
398                 .maxlen         = sizeof(int),
399                 .mode           = 0644,
400                 .proc_handler   = &proc_dointvec,
401         },
402 #ifdef __sparc__
403         {
404                 .ctl_name       = KERN_SPARC_REBOOT,
405                 .procname       = "reboot-cmd",
406                 .data           = reboot_command,
407                 .maxlen         = 256,
408                 .mode           = 0644,
409                 .proc_handler   = &proc_dostring,
410                 .strategy       = &sysctl_string,
411         },
412         {
413                 .ctl_name       = KERN_SPARC_STOP_A,
414                 .procname       = "stop-a",
415                 .data           = &stop_a_enabled,
416                 .maxlen         = sizeof (int),
417                 .mode           = 0644,
418                 .proc_handler   = &proc_dointvec,
419         },
420         {
421                 .ctl_name       = KERN_SPARC_SCONS_PWROFF,
422                 .procname       = "scons-poweroff",
423                 .data           = &scons_pwroff,
424                 .maxlen         = sizeof (int),
425                 .mode           = 0644,
426                 .proc_handler   = &proc_dointvec,
427         },
428 #endif
429 #ifdef __hppa__
430         {
431                 .ctl_name       = KERN_HPPA_PWRSW,
432                 .procname       = "soft-power",
433                 .data           = &pwrsw_enabled,
434                 .maxlen         = sizeof (int),
435                 .mode           = 0644,
436                 .proc_handler   = &proc_dointvec,
437         },
438         {
439                 .ctl_name       = KERN_HPPA_UNALIGNED,
440                 .procname       = "unaligned-trap",
441                 .data           = &unaligned_enabled,
442                 .maxlen         = sizeof (int),
443                 .mode           = 0644,
444                 .proc_handler   = &proc_dointvec,
445         },
446 #endif
447         {
448                 .ctl_name       = KERN_CTLALTDEL,
449                 .procname       = "ctrl-alt-del",
450                 .data           = &C_A_D,
451                 .maxlen         = sizeof(int),
452                 .mode           = 0644,
453                 .proc_handler   = &proc_dointvec,
454         },
455         {
456                 .ctl_name       = KERN_PRINTK,
457                 .procname       = "printk",
458                 .data           = &console_loglevel,
459                 .maxlen         = 4*sizeof(int),
460                 .mode           = 0644,
461                 .proc_handler   = &proc_dointvec,
462         },
463 #ifdef CONFIG_KMOD
464         {
465                 .ctl_name       = KERN_MODPROBE,
466                 .procname       = "modprobe",
467                 .data           = &modprobe_path,
468                 .maxlen         = KMOD_PATH_LEN,
469                 .mode           = 0644,
470                 .proc_handler   = &proc_dostring,
471                 .strategy       = &sysctl_string,
472         },
473 #endif
474 #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
475         {
476                 .ctl_name       = KERN_HOTPLUG,
477                 .procname       = "hotplug",
478                 .data           = &uevent_helper,
479                 .maxlen         = UEVENT_HELPER_PATH_LEN,
480                 .mode           = 0644,
481                 .proc_handler   = &proc_dostring,
482                 .strategy       = &sysctl_string,
483         },
484 #endif
485 #ifdef CONFIG_CHR_DEV_SG
486         {
487                 .ctl_name       = KERN_SG_BIG_BUFF,
488                 .procname       = "sg-big-buff",
489                 .data           = &sg_big_buff,
490                 .maxlen         = sizeof (int),
491                 .mode           = 0444,
492                 .proc_handler   = &proc_dointvec,
493         },
494 #endif
495 #ifdef CONFIG_BSD_PROCESS_ACCT
496         {
497                 .ctl_name       = KERN_ACCT,
498                 .procname       = "acct",
499                 .data           = &acct_parm,
500                 .maxlen         = 3*sizeof(int),
501                 .mode           = 0644,
502                 .proc_handler   = &proc_dointvec,
503         },
504 #endif
505 #ifdef CONFIG_MAGIC_SYSRQ
506         {
507                 .ctl_name       = KERN_SYSRQ,
508                 .procname       = "sysrq",
509                 .data           = &__sysrq_enabled,
510                 .maxlen         = sizeof (int),
511                 .mode           = 0644,
512                 .proc_handler   = &proc_dointvec,
513         },
514 #endif
515 #ifdef CONFIG_PROC_SYSCTL
516         {
517                 .ctl_name       = KERN_CADPID,
518                 .procname       = "cad_pid",
519                 .data           = NULL,
520                 .maxlen         = sizeof (int),
521                 .mode           = 0600,
522                 .proc_handler   = &proc_do_cad_pid,
523         },
524 #endif
525         {
526                 .ctl_name       = KERN_MAX_THREADS,
527                 .procname       = "threads-max",
528                 .data           = &max_threads,
529                 .maxlen         = sizeof(int),
530                 .mode           = 0644,
531                 .proc_handler   = &proc_dointvec,
532         },
533         {
534                 .ctl_name       = KERN_RANDOM,
535                 .procname       = "random",
536                 .mode           = 0555,
537                 .child          = random_table,
538         },
539 #ifdef CONFIG_UNIX98_PTYS
540         {
541                 .ctl_name       = KERN_PTY,
542                 .procname       = "pty",
543                 .mode           = 0555,
544                 .child          = pty_table,
545         },
546 #endif
547         {
548                 .ctl_name       = KERN_OVERFLOWUID,
549                 .procname       = "overflowuid",
550                 .data           = &overflowuid,
551                 .maxlen         = sizeof(int),
552                 .mode           = 0644,
553                 .proc_handler   = &proc_dointvec_minmax,
554                 .strategy       = &sysctl_intvec,
555                 .extra1         = &minolduid,
556                 .extra2         = &maxolduid,
557         },
558         {
559                 .ctl_name       = KERN_OVERFLOWGID,
560                 .procname       = "overflowgid",
561                 .data           = &overflowgid,
562                 .maxlen         = sizeof(int),
563                 .mode           = 0644,
564                 .proc_handler   = &proc_dointvec_minmax,
565                 .strategy       = &sysctl_intvec,
566                 .extra1         = &minolduid,
567                 .extra2         = &maxolduid,
568         },
569 #ifdef CONFIG_S390
570 #ifdef CONFIG_MATHEMU
571         {
572                 .ctl_name       = KERN_IEEE_EMULATION_WARNINGS,
573                 .procname       = "ieee_emulation_warnings",
574                 .data           = &sysctl_ieee_emulation_warnings,
575                 .maxlen         = sizeof(int),
576                 .mode           = 0644,
577                 .proc_handler   = &proc_dointvec,
578         },
579 #endif
580 #ifdef CONFIG_NO_IDLE_HZ
581         {
582                 .ctl_name       = KERN_HZ_TIMER,
583                 .procname       = "hz_timer",
584                 .data           = &sysctl_hz_timer,
585                 .maxlen         = sizeof(int),
586                 .mode           = 0644,
587                 .proc_handler   = &proc_dointvec,
588         },
589 #endif
590         {
591                 .ctl_name       = KERN_S390_USER_DEBUG_LOGGING,
592                 .procname       = "userprocess_debug",
593                 .data           = &sysctl_userprocess_debug,
594                 .maxlen         = sizeof(int),
595                 .mode           = 0644,
596                 .proc_handler   = &proc_dointvec,
597         },
598 #endif
599         {
600                 .ctl_name       = KERN_PIDMAX,
601                 .procname       = "pid_max",
602                 .data           = &pid_max,
603                 .maxlen         = sizeof (int),
604                 .mode           = 0644,
605                 .proc_handler   = &proc_dointvec_minmax,
606                 .strategy       = sysctl_intvec,
607                 .extra1         = &pid_max_min,
608                 .extra2         = &pid_max_max,
609         },
610         {
611                 .ctl_name       = KERN_PANIC_ON_OOPS,
612                 .procname       = "panic_on_oops",
613                 .data           = &panic_on_oops,
614                 .maxlen         = sizeof(int),
615                 .mode           = 0644,
616                 .proc_handler   = &proc_dointvec,
617         },
618         {
619                 .ctl_name       = KERN_PRINTK_RATELIMIT,
620                 .procname       = "printk_ratelimit",
621                 .data           = &printk_ratelimit_jiffies,
622                 .maxlen         = sizeof(int),
623                 .mode           = 0644,
624                 .proc_handler   = &proc_dointvec_jiffies,
625                 .strategy       = &sysctl_jiffies,
626         },
627         {
628                 .ctl_name       = KERN_PRINTK_RATELIMIT_BURST,
629                 .procname       = "printk_ratelimit_burst",
630                 .data           = &printk_ratelimit_burst,
631                 .maxlen         = sizeof(int),
632                 .mode           = 0644,
633                 .proc_handler   = &proc_dointvec,
634         },
635         {
636                 .ctl_name       = KERN_NGROUPS_MAX,
637                 .procname       = "ngroups_max",
638                 .data           = &ngroups_max,
639                 .maxlen         = sizeof (int),
640                 .mode           = 0444,
641                 .proc_handler   = &proc_dointvec,
642         },
643 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
644         {
645                 .ctl_name       = KERN_UNKNOWN_NMI_PANIC,
646                 .procname       = "unknown_nmi_panic",
647                 .data           = &unknown_nmi_panic,
648                 .maxlen         = sizeof (int),
649                 .mode           = 0644,
650                 .proc_handler   = &proc_dointvec,
651         },
652         {
653                 .ctl_name       = KERN_NMI_WATCHDOG,
654                 .procname       = "nmi_watchdog",
655                 .data           = &nmi_watchdog_enabled,
656                 .maxlen         = sizeof (int),
657                 .mode           = 0644,
658                 .proc_handler   = &proc_nmi_enabled,
659         },
660 #endif
661 #if defined(CONFIG_X86)
662         {
663                 .ctl_name       = KERN_PANIC_ON_NMI,
664                 .procname       = "panic_on_unrecovered_nmi",
665                 .data           = &panic_on_unrecovered_nmi,
666                 .maxlen         = sizeof(int),
667                 .mode           = 0644,
668                 .proc_handler   = &proc_dointvec,
669         },
670         {
671                 .ctl_name       = KERN_BOOTLOADER_TYPE,
672                 .procname       = "bootloader_type",
673                 .data           = &bootloader_type,
674                 .maxlen         = sizeof (int),
675                 .mode           = 0444,
676                 .proc_handler   = &proc_dointvec,
677         },
678         {
679                 .ctl_name       = CTL_UNNUMBERED,
680                 .procname       = "kstack_depth_to_print",
681                 .data           = &kstack_depth_to_print,
682                 .maxlen         = sizeof(int),
683                 .mode           = 0644,
684                 .proc_handler   = &proc_dointvec,
685         },
686 #endif
687 #if defined(CONFIG_MMU)
688         {
689                 .ctl_name       = KERN_RANDOMIZE,
690                 .procname       = "randomize_va_space",
691                 .data           = &randomize_va_space,
692                 .maxlen         = sizeof(int),
693                 .mode           = 0644,
694                 .proc_handler   = &proc_dointvec,
695         },
696 #endif
697 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
698         {
699                 .ctl_name       = KERN_SPIN_RETRY,
700                 .procname       = "spin_retry",
701                 .data           = &spin_retry,
702                 .maxlen         = sizeof (int),
703                 .mode           = 0644,
704                 .proc_handler   = &proc_dointvec,
705         },
706 #endif
707 #if     defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
708         {
709                 .ctl_name       = KERN_ACPI_VIDEO_FLAGS,
710                 .procname       = "acpi_video_flags",
711                 .data           = &acpi_realmode_flags,
712                 .maxlen         = sizeof (unsigned long),
713                 .mode           = 0644,
714                 .proc_handler   = &proc_doulongvec_minmax,
715         },
716 #endif
717 #ifdef CONFIG_IA64
718         {
719                 .ctl_name       = KERN_IA64_UNALIGNED,
720                 .procname       = "ignore-unaligned-usertrap",
721                 .data           = &no_unaligned_warning,
722                 .maxlen         = sizeof (int),
723                 .mode           = 0644,
724                 .proc_handler   = &proc_dointvec,
725         },
726 #endif
727 #ifdef CONFIG_DETECT_SOFTLOCKUP
728         {
729                 .ctl_name       = CTL_UNNUMBERED,
730                 .procname       = "softlockup_thresh",
731                 .data           = &softlockup_thresh,
732                 .maxlen         = sizeof(int),
733                 .mode           = 0644,
734                 .proc_handler   = &proc_dointvec_minmax,
735                 .strategy       = &sysctl_intvec,
736                 .extra1         = &one,
737                 .extra2         = &sixty,
738         },
739 #endif
740 #ifdef CONFIG_COMPAT
741         {
742                 .ctl_name       = KERN_COMPAT_LOG,
743                 .procname       = "compat-log",
744                 .data           = &compat_log,
745                 .maxlen         = sizeof (int),
746                 .mode           = 0644,
747                 .proc_handler   = &proc_dointvec,
748         },
749 #endif
750 #ifdef CONFIG_RT_MUTEXES
751         {
752                 .ctl_name       = KERN_MAX_LOCK_DEPTH,
753                 .procname       = "max_lock_depth",
754                 .data           = &max_lock_depth,
755                 .maxlen         = sizeof(int),
756                 .mode           = 0644,
757                 .proc_handler   = &proc_dointvec,
758         },
759 #endif
760 #ifdef CONFIG_PROC_FS
761         {
762                 .ctl_name       = CTL_UNNUMBERED,
763                 .procname       = "maps_protect",
764                 .data           = &maps_protect,
765                 .maxlen         = sizeof(int),
766                 .mode           = 0644,
767                 .proc_handler   = &proc_dointvec,
768         },
769 #endif
770         {
771                 .ctl_name       = CTL_UNNUMBERED,
772                 .procname       = "poweroff_cmd",
773                 .data           = &poweroff_cmd,
774                 .maxlen         = POWEROFF_CMD_PATH_LEN,
775                 .mode           = 0644,
776                 .proc_handler   = &proc_dostring,
777                 .strategy       = &sysctl_string,
778         },
779 /*
780  * NOTE: do not add new entries to this table unless you have read
781  * Documentation/sysctl/ctl_unnumbered.txt
782  */
783         { .ctl_name = 0 }
784 };
785
786 static struct ctl_table vm_table[] = {
787         {
788                 .ctl_name       = VM_OVERCOMMIT_MEMORY,
789                 .procname       = "overcommit_memory",
790                 .data           = &sysctl_overcommit_memory,
791                 .maxlen         = sizeof(sysctl_overcommit_memory),
792                 .mode           = 0644,
793                 .proc_handler   = &proc_dointvec,
794         },
795         {
796                 .ctl_name       = VM_PANIC_ON_OOM,
797                 .procname       = "panic_on_oom",
798                 .data           = &sysctl_panic_on_oom,
799                 .maxlen         = sizeof(sysctl_panic_on_oom),
800                 .mode           = 0644,
801                 .proc_handler   = &proc_dointvec,
802         },
803         {
804                 .ctl_name       = CTL_UNNUMBERED,
805                 .procname       = "oom_kill_allocating_task",
806                 .data           = &sysctl_oom_kill_allocating_task,
807                 .maxlen         = sizeof(sysctl_oom_kill_allocating_task),
808                 .mode           = 0644,
809                 .proc_handler   = &proc_dointvec,
810         },
811         {
812                 .ctl_name       = VM_OVERCOMMIT_RATIO,
813                 .procname       = "overcommit_ratio",
814                 .data           = &sysctl_overcommit_ratio,
815                 .maxlen         = sizeof(sysctl_overcommit_ratio),
816                 .mode           = 0644,
817                 .proc_handler   = &proc_dointvec,
818         },
819         {
820                 .ctl_name       = VM_PAGE_CLUSTER,
821                 .procname       = "page-cluster", 
822                 .data           = &page_cluster,
823                 .maxlen         = sizeof(int),
824                 .mode           = 0644,
825                 .proc_handler   = &proc_dointvec,
826         },
827         {
828                 .ctl_name       = VM_DIRTY_BACKGROUND,
829                 .procname       = "dirty_background_ratio",
830                 .data           = &dirty_background_ratio,
831                 .maxlen         = sizeof(dirty_background_ratio),
832                 .mode           = 0644,
833                 .proc_handler   = &proc_dointvec_minmax,
834                 .strategy       = &sysctl_intvec,
835                 .extra1         = &zero,
836                 .extra2         = &one_hundred,
837         },
838         {
839                 .ctl_name       = VM_DIRTY_RATIO,
840                 .procname       = "dirty_ratio",
841                 .data           = &vm_dirty_ratio,
842                 .maxlen         = sizeof(vm_dirty_ratio),
843                 .mode           = 0644,
844                 .proc_handler   = &dirty_ratio_handler,
845                 .strategy       = &sysctl_intvec,
846                 .extra1         = &zero,
847                 .extra2         = &one_hundred,
848         },
849         {
850                 .ctl_name       = VM_DIRTY_WB_CS,
851                 .procname       = "dirty_writeback_centisecs",
852                 .data           = &dirty_writeback_interval,
853                 .maxlen         = sizeof(dirty_writeback_interval),
854                 .mode           = 0644,
855                 .proc_handler   = &dirty_writeback_centisecs_handler,
856         },
857         {
858                 .ctl_name       = VM_DIRTY_EXPIRE_CS,
859                 .procname       = "dirty_expire_centisecs",
860                 .data           = &dirty_expire_interval,
861                 .maxlen         = sizeof(dirty_expire_interval),
862                 .mode           = 0644,
863                 .proc_handler   = &proc_dointvec_userhz_jiffies,
864         },
865         {
866                 .ctl_name       = VM_NR_PDFLUSH_THREADS,
867                 .procname       = "nr_pdflush_threads",
868                 .data           = &nr_pdflush_threads,
869                 .maxlen         = sizeof nr_pdflush_threads,
870                 .mode           = 0444 /* read-only*/,
871                 .proc_handler   = &proc_dointvec,
872         },
873         {
874                 .ctl_name       = VM_SWAPPINESS,
875                 .procname       = "swappiness",
876                 .data           = &vm_swappiness,
877                 .maxlen         = sizeof(vm_swappiness),
878                 .mode           = 0644,
879                 .proc_handler   = &proc_dointvec_minmax,
880                 .strategy       = &sysctl_intvec,
881                 .extra1         = &zero,
882                 .extra2         = &one_hundred,
883         },
884 #ifdef CONFIG_HUGETLB_PAGE
885          {
886                 .ctl_name       = VM_HUGETLB_PAGES,
887                 .procname       = "nr_hugepages",
888                 .data           = &max_huge_pages,
889                 .maxlen         = sizeof(unsigned long),
890                 .mode           = 0644,
891                 .proc_handler   = &hugetlb_sysctl_handler,
892                 .extra1         = (void *)&hugetlb_zero,
893                 .extra2         = (void *)&hugetlb_infinity,
894          },
895          {
896                 .ctl_name       = VM_HUGETLB_GROUP,
897                 .procname       = "hugetlb_shm_group",
898                 .data           = &sysctl_hugetlb_shm_group,
899                 .maxlen         = sizeof(gid_t),
900                 .mode           = 0644,
901                 .proc_handler   = &proc_dointvec,
902          },
903          {
904                 .ctl_name       = CTL_UNNUMBERED,
905                 .procname       = "hugepages_treat_as_movable",
906                 .data           = &hugepages_treat_as_movable,
907                 .maxlen         = sizeof(int),
908                 .mode           = 0644,
909                 .proc_handler   = &hugetlb_treat_movable_handler,
910         },
911         {
912                 .ctl_name       = CTL_UNNUMBERED,
913                 .procname       = "hugetlb_dynamic_pool",
914                 .data           = &hugetlb_dynamic_pool,
915                 .maxlen         = sizeof(hugetlb_dynamic_pool),
916                 .mode           = 0644,
917                 .proc_handler   = &proc_dointvec,
918         },
919 #endif
920         {
921                 .ctl_name       = VM_LOWMEM_RESERVE_RATIO,
922                 .procname       = "lowmem_reserve_ratio",
923                 .data           = &sysctl_lowmem_reserve_ratio,
924                 .maxlen         = sizeof(sysctl_lowmem_reserve_ratio),
925                 .mode           = 0644,
926                 .proc_handler   = &lowmem_reserve_ratio_sysctl_handler,
927                 .strategy       = &sysctl_intvec,
928         },
929         {
930                 .ctl_name       = VM_DROP_PAGECACHE,
931                 .procname       = "drop_caches",
932                 .data           = &sysctl_drop_caches,
933                 .maxlen         = sizeof(int),
934                 .mode           = 0644,
935                 .proc_handler   = drop_caches_sysctl_handler,
936                 .strategy       = &sysctl_intvec,
937         },
938         {
939                 .ctl_name       = VM_MIN_FREE_KBYTES,
940                 .procname       = "min_free_kbytes",
941                 .data           = &min_free_kbytes,
942                 .maxlen         = sizeof(min_free_kbytes),
943                 .mode           = 0644,
944                 .proc_handler   = &min_free_kbytes_sysctl_handler,
945                 .strategy       = &sysctl_intvec,
946                 .extra1         = &zero,
947         },
948         {
949                 .ctl_name       = VM_PERCPU_PAGELIST_FRACTION,
950                 .procname       = "percpu_pagelist_fraction",
951                 .data           = &percpu_pagelist_fraction,
952                 .maxlen         = sizeof(percpu_pagelist_fraction),
953                 .mode           = 0644,
954                 .proc_handler   = &percpu_pagelist_fraction_sysctl_handler,
955                 .strategy       = &sysctl_intvec,
956                 .extra1         = &min_percpu_pagelist_fract,
957         },
958 #ifdef CONFIG_MMU
959         {
960                 .ctl_name       = VM_MAX_MAP_COUNT,
961                 .procname       = "max_map_count",
962                 .data           = &sysctl_max_map_count,
963                 .maxlen         = sizeof(sysctl_max_map_count),
964                 .mode           = 0644,
965                 .proc_handler   = &proc_dointvec
966         },
967 #endif
968         {
969                 .ctl_name       = VM_LAPTOP_MODE,
970                 .procname       = "laptop_mode",
971                 .data           = &laptop_mode,
972                 .maxlen         = sizeof(laptop_mode),
973                 .mode           = 0644,
974                 .proc_handler   = &proc_dointvec_jiffies,
975                 .strategy       = &sysctl_jiffies,
976         },
977         {
978                 .ctl_name       = VM_BLOCK_DUMP,
979                 .procname       = "block_dump",
980                 .data           = &block_dump,
981                 .maxlen         = sizeof(block_dump),
982                 .mode           = 0644,
983                 .proc_handler   = &proc_dointvec,
984                 .strategy       = &sysctl_intvec,
985                 .extra1         = &zero,
986         },
987         {
988                 .ctl_name       = VM_VFS_CACHE_PRESSURE,
989                 .procname       = "vfs_cache_pressure",
990                 .data           = &sysctl_vfs_cache_pressure,
991                 .maxlen         = sizeof(sysctl_vfs_cache_pressure),
992                 .mode           = 0644,
993                 .proc_handler   = &proc_dointvec,
994                 .strategy       = &sysctl_intvec,
995                 .extra1         = &zero,
996         },
997 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
998         {
999                 .ctl_name       = VM_LEGACY_VA_LAYOUT,
1000                 .procname       = "legacy_va_layout",
1001                 .data           = &sysctl_legacy_va_layout,
1002                 .maxlen         = sizeof(sysctl_legacy_va_layout),
1003                 .mode           = 0644,
1004                 .proc_handler   = &proc_dointvec,
1005                 .strategy       = &sysctl_intvec,
1006                 .extra1         = &zero,
1007         },
1008 #endif
1009 #ifdef CONFIG_NUMA
1010         {
1011                 .ctl_name       = VM_ZONE_RECLAIM_MODE,
1012                 .procname       = "zone_reclaim_mode",
1013                 .data           = &zone_reclaim_mode,
1014                 .maxlen         = sizeof(zone_reclaim_mode),
1015                 .mode           = 0644,
1016                 .proc_handler   = &proc_dointvec,
1017                 .strategy       = &sysctl_intvec,
1018                 .extra1         = &zero,
1019         },
1020         {
1021                 .ctl_name       = VM_MIN_UNMAPPED,
1022                 .procname       = "min_unmapped_ratio",
1023                 .data           = &sysctl_min_unmapped_ratio,
1024                 .maxlen         = sizeof(sysctl_min_unmapped_ratio),
1025                 .mode           = 0644,
1026                 .proc_handler   = &sysctl_min_unmapped_ratio_sysctl_handler,
1027                 .strategy       = &sysctl_intvec,
1028                 .extra1         = &zero,
1029                 .extra2         = &one_hundred,
1030         },
1031         {
1032                 .ctl_name       = VM_MIN_SLAB,
1033                 .procname       = "min_slab_ratio",
1034                 .data           = &sysctl_min_slab_ratio,
1035                 .maxlen         = sizeof(sysctl_min_slab_ratio),
1036                 .mode           = 0644,
1037                 .proc_handler   = &sysctl_min_slab_ratio_sysctl_handler,
1038                 .strategy       = &sysctl_intvec,
1039                 .extra1         = &zero,
1040                 .extra2         = &one_hundred,
1041         },
1042 #endif
1043 #ifdef CONFIG_SMP
1044         {
1045                 .ctl_name       = CTL_UNNUMBERED,
1046                 .procname       = "stat_interval",
1047                 .data           = &sysctl_stat_interval,
1048                 .maxlen         = sizeof(sysctl_stat_interval),
1049                 .mode           = 0644,
1050                 .proc_handler   = &proc_dointvec_jiffies,
1051                 .strategy       = &sysctl_jiffies,
1052         },
1053 #endif
1054 #ifdef CONFIG_SECURITY
1055         {
1056                 .ctl_name       = CTL_UNNUMBERED,
1057                 .procname       = "mmap_min_addr",
1058                 .data           = &mmap_min_addr,
1059                 .maxlen         = sizeof(unsigned long),
1060                 .mode           = 0644,
1061                 .proc_handler   = &proc_doulongvec_minmax,
1062         },
1063 #endif
1064 #ifdef CONFIG_NUMA
1065         {
1066                 .ctl_name       = CTL_UNNUMBERED,
1067                 .procname       = "numa_zonelist_order",
1068                 .data           = &numa_zonelist_order,
1069                 .maxlen         = NUMA_ZONELIST_ORDER_LEN,
1070                 .mode           = 0644,
1071                 .proc_handler   = &numa_zonelist_order_handler,
1072                 .strategy       = &sysctl_string,
1073         },
1074 #endif
1075 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1076    (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1077         {
1078                 .ctl_name       = VM_VDSO_ENABLED,
1079                 .procname       = "vdso_enabled",
1080                 .data           = &vdso_enabled,
1081                 .maxlen         = sizeof(vdso_enabled),
1082                 .mode           = 0644,
1083                 .proc_handler   = &proc_dointvec,
1084                 .strategy       = &sysctl_intvec,
1085                 .extra1         = &zero,
1086         },
1087 #endif
1088 /*
1089  * NOTE: do not add new entries to this table unless you have read
1090  * Documentation/sysctl/ctl_unnumbered.txt
1091  */
1092         { .ctl_name = 0 }
1093 };
1094
1095 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1096 static struct ctl_table binfmt_misc_table[] = {
1097         { .ctl_name = 0 }
1098 };
1099 #endif
1100
1101 static struct ctl_table fs_table[] = {
1102         {
1103                 .ctl_name       = FS_NRINODE,
1104                 .procname       = "inode-nr",
1105                 .data           = &inodes_stat,
1106                 .maxlen         = 2*sizeof(int),
1107                 .mode           = 0444,
1108                 .proc_handler   = &proc_dointvec,
1109         },
1110         {
1111                 .ctl_name       = FS_STATINODE,
1112                 .procname       = "inode-state",
1113                 .data           = &inodes_stat,
1114                 .maxlen         = 7*sizeof(int),
1115                 .mode           = 0444,
1116                 .proc_handler   = &proc_dointvec,
1117         },
1118         {
1119                 .ctl_name       = FS_NRFILE,
1120                 .procname       = "file-nr",
1121                 .data           = &files_stat,
1122                 .maxlen         = 3*sizeof(int),
1123                 .mode           = 0444,
1124                 .proc_handler   = &proc_nr_files,
1125         },
1126         {
1127                 .ctl_name       = FS_MAXFILE,
1128                 .procname       = "file-max",
1129                 .data           = &files_stat.max_files,
1130                 .maxlen         = sizeof(int),
1131                 .mode           = 0644,
1132                 .proc_handler   = &proc_dointvec,
1133         },
1134         {
1135                 .ctl_name       = FS_DENTRY,
1136                 .procname       = "dentry-state",
1137                 .data           = &dentry_stat,
1138                 .maxlen         = 6*sizeof(int),
1139                 .mode           = 0444,
1140                 .proc_handler   = &proc_dointvec,
1141         },
1142         {
1143                 .ctl_name       = FS_OVERFLOWUID,
1144                 .procname       = "overflowuid",
1145                 .data           = &fs_overflowuid,
1146                 .maxlen         = sizeof(int),
1147                 .mode           = 0644,
1148                 .proc_handler   = &proc_dointvec_minmax,
1149                 .strategy       = &sysctl_intvec,
1150                 .extra1         = &minolduid,
1151                 .extra2         = &maxolduid,
1152         },
1153         {
1154                 .ctl_name       = FS_OVERFLOWGID,
1155                 .procname       = "overflowgid",
1156                 .data           = &fs_overflowgid,
1157                 .maxlen         = sizeof(int),
1158                 .mode           = 0644,
1159                 .proc_handler   = &proc_dointvec_minmax,
1160                 .strategy       = &sysctl_intvec,
1161                 .extra1         = &minolduid,
1162                 .extra2         = &maxolduid,
1163         },
1164         {
1165                 .ctl_name       = FS_LEASES,
1166                 .procname       = "leases-enable",
1167                 .data           = &leases_enable,
1168                 .maxlen         = sizeof(int),
1169                 .mode           = 0644,
1170                 .proc_handler   = &proc_dointvec,
1171         },
1172 #ifdef CONFIG_DNOTIFY
1173         {
1174                 .ctl_name       = FS_DIR_NOTIFY,
1175                 .procname       = "dir-notify-enable",
1176                 .data           = &dir_notify_enable,
1177                 .maxlen         = sizeof(int),
1178                 .mode           = 0644,
1179                 .proc_handler   = &proc_dointvec,
1180         },
1181 #endif
1182 #ifdef CONFIG_MMU
1183         {
1184                 .ctl_name       = FS_LEASE_TIME,
1185                 .procname       = "lease-break-time",
1186                 .data           = &lease_break_time,
1187                 .maxlen         = sizeof(int),
1188                 .mode           = 0644,
1189                 .proc_handler   = &proc_dointvec_minmax,
1190                 .strategy       = &sysctl_intvec,
1191                 .extra1         = &zero,
1192                 .extra2         = &two,
1193         },
1194         {
1195                 .ctl_name       = FS_AIO_NR,
1196                 .procname       = "aio-nr",
1197                 .data           = &aio_nr,
1198                 .maxlen         = sizeof(aio_nr),
1199                 .mode           = 0444,
1200                 .proc_handler   = &proc_doulongvec_minmax,
1201         },
1202         {
1203                 .ctl_name       = FS_AIO_MAX_NR,
1204                 .procname       = "aio-max-nr",
1205                 .data           = &aio_max_nr,
1206                 .maxlen         = sizeof(aio_max_nr),
1207                 .mode           = 0644,
1208                 .proc_handler   = &proc_doulongvec_minmax,
1209         },
1210 #ifdef CONFIG_INOTIFY_USER
1211         {
1212                 .ctl_name       = FS_INOTIFY,
1213                 .procname       = "inotify",
1214                 .mode           = 0555,
1215                 .child          = inotify_table,
1216         },
1217 #endif  
1218 #endif
1219         {
1220                 .ctl_name       = KERN_SETUID_DUMPABLE,
1221                 .procname       = "suid_dumpable",
1222                 .data           = &suid_dumpable,
1223                 .maxlen         = sizeof(int),
1224                 .mode           = 0644,
1225                 .proc_handler   = &proc_dointvec,
1226         },
1227 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1228         {
1229                 .ctl_name       = CTL_UNNUMBERED,
1230                 .procname       = "binfmt_misc",
1231                 .mode           = 0555,
1232                 .child          = binfmt_misc_table,
1233         },
1234 #endif
1235 /*
1236  * NOTE: do not add new entries to this table unless you have read
1237  * Documentation/sysctl/ctl_unnumbered.txt
1238  */
1239         { .ctl_name = 0 }
1240 };
1241
1242 static struct ctl_table debug_table[] = {
1243 #if defined(CONFIG_X86) || defined(CONFIG_PPC)
1244         {
1245                 .ctl_name       = CTL_UNNUMBERED,
1246                 .procname       = "exception-trace",
1247                 .data           = &show_unhandled_signals,
1248                 .maxlen         = sizeof(int),
1249                 .mode           = 0644,
1250                 .proc_handler   = proc_dointvec
1251         },
1252 #endif
1253         { .ctl_name = 0 }
1254 };
1255
1256 static struct ctl_table dev_table[] = {
1257         { .ctl_name = 0 }
1258 };
1259
1260 static DEFINE_SPINLOCK(sysctl_lock);
1261
1262 /* called under sysctl_lock */
1263 static int use_table(struct ctl_table_header *p)
1264 {
1265         if (unlikely(p->unregistering))
1266                 return 0;
1267         p->used++;
1268         return 1;
1269 }
1270
1271 /* called under sysctl_lock */
1272 static void unuse_table(struct ctl_table_header *p)
1273 {
1274         if (!--p->used)
1275                 if (unlikely(p->unregistering))
1276                         complete(p->unregistering);
1277 }
1278
1279 /* called under sysctl_lock, will reacquire if has to wait */
1280 static void start_unregistering(struct ctl_table_header *p)
1281 {
1282         /*
1283          * if p->used is 0, nobody will ever touch that entry again;
1284          * we'll eliminate all paths to it before dropping sysctl_lock
1285          */
1286         if (unlikely(p->used)) {
1287                 struct completion wait;
1288                 init_completion(&wait);
1289                 p->unregistering = &wait;
1290                 spin_unlock(&sysctl_lock);
1291                 wait_for_completion(&wait);
1292                 spin_lock(&sysctl_lock);
1293         }
1294         /*
1295          * do not remove from the list until nobody holds it; walking the
1296          * list in do_sysctl() relies on that.
1297          */
1298         list_del_init(&p->ctl_entry);
1299 }
1300
1301 void sysctl_head_finish(struct ctl_table_header *head)
1302 {
1303         if (!head)
1304                 return;
1305         spin_lock(&sysctl_lock);
1306         unuse_table(head);
1307         spin_unlock(&sysctl_lock);
1308 }
1309
1310 struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev)
1311 {
1312         struct ctl_table_header *head;
1313         struct list_head *tmp;
1314         spin_lock(&sysctl_lock);
1315         if (prev) {
1316                 tmp = &prev->ctl_entry;
1317                 unuse_table(prev);
1318                 goto next;
1319         }
1320         tmp = &root_table_header.ctl_entry;
1321         for (;;) {
1322                 head = list_entry(tmp, struct ctl_table_header, ctl_entry);
1323
1324                 if (!use_table(head))
1325                         goto next;
1326                 spin_unlock(&sysctl_lock);
1327                 return head;
1328         next:
1329                 tmp = tmp->next;
1330                 if (tmp == &root_table_header.ctl_entry)
1331                         break;
1332         }
1333         spin_unlock(&sysctl_lock);
1334         return NULL;
1335 }
1336
1337 #ifdef CONFIG_SYSCTL_SYSCALL
1338 int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp,
1339                void __user *newval, size_t newlen)
1340 {
1341         struct ctl_table_header *head;
1342         int error = -ENOTDIR;
1343
1344         if (nlen <= 0 || nlen >= CTL_MAXNAME)
1345                 return -ENOTDIR;
1346         if (oldval) {
1347                 int old_len;
1348                 if (!oldlenp || get_user(old_len, oldlenp))
1349                         return -EFAULT;
1350         }
1351
1352         for (head = sysctl_head_next(NULL); head;
1353                         head = sysctl_head_next(head)) {
1354                 error = parse_table(name, nlen, oldval, oldlenp, 
1355                                         newval, newlen, head->ctl_table);
1356                 if (error != -ENOTDIR) {
1357                         sysctl_head_finish(head);
1358                         break;
1359                 }
1360         }
1361         return error;
1362 }
1363
1364 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
1365 {
1366         struct __sysctl_args tmp;
1367         int error;
1368
1369         if (copy_from_user(&tmp, args, sizeof(tmp)))
1370                 return -EFAULT;
1371
1372         lock_kernel();
1373         error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp,
1374                           tmp.newval, tmp.newlen);
1375         unlock_kernel();
1376         return error;
1377 }
1378 #endif /* CONFIG_SYSCTL_SYSCALL */
1379
1380 /*
1381  * sysctl_perm does NOT grant the superuser all rights automatically, because
1382  * some sysctl variables are readonly even to root.
1383  */
1384
1385 static int test_perm(int mode, int op)
1386 {
1387         if (!current->euid)
1388                 mode >>= 6;
1389         else if (in_egroup_p(0))
1390                 mode >>= 3;
1391         if ((mode & op & 0007) == op)
1392                 return 0;
1393         return -EACCES;
1394 }
1395
1396 int sysctl_perm(struct ctl_table *table, int op)
1397 {
1398         int error;
1399         error = security_sysctl(table, op);
1400         if (error)
1401                 return error;
1402         return test_perm(table->mode, op);
1403 }
1404
1405 #ifdef CONFIG_SYSCTL_SYSCALL
1406 static int parse_table(int __user *name, int nlen,
1407                        void __user *oldval, size_t __user *oldlenp,
1408                        void __user *newval, size_t newlen,
1409                        struct ctl_table *table)
1410 {
1411         int n;
1412 repeat:
1413         if (!nlen)
1414                 return -ENOTDIR;
1415         if (get_user(n, name))
1416                 return -EFAULT;
1417         for ( ; table->ctl_name || table->procname; table++) {
1418                 if (!table->ctl_name)
1419                         continue;
1420                 if (n == table->ctl_name) {
1421                         int error;
1422                         if (table->child) {
1423                                 if (sysctl_perm(table, 001))
1424                                         return -EPERM;
1425                                 name++;
1426                                 nlen--;
1427                                 table = table->child;
1428                                 goto repeat;
1429                         }
1430                         error = do_sysctl_strategy(table, name, nlen,
1431                                                    oldval, oldlenp,
1432                                                    newval, newlen);
1433                         return error;
1434                 }
1435         }
1436         return -ENOTDIR;
1437 }
1438
1439 /* Perform the actual read/write of a sysctl table entry. */
1440 int do_sysctl_strategy (struct ctl_table *table,
1441                         int __user *name, int nlen,
1442                         void __user *oldval, size_t __user *oldlenp,
1443                         void __user *newval, size_t newlen)
1444 {
1445         int op = 0, rc;
1446         size_t len;
1447
1448         if (oldval)
1449                 op |= 004;
1450         if (newval) 
1451                 op |= 002;
1452         if (sysctl_perm(table, op))
1453                 return -EPERM;
1454
1455         if (table->strategy) {
1456                 rc = table->strategy(table, name, nlen, oldval, oldlenp,
1457                                      newval, newlen);
1458                 if (rc < 0)
1459                         return rc;
1460                 if (rc > 0)
1461                         return 0;
1462         }
1463
1464         /* If there is no strategy routine, or if the strategy returns
1465          * zero, proceed with automatic r/w */
1466         if (table->data && table->maxlen) {
1467                 if (oldval && oldlenp) {
1468                         if (get_user(len, oldlenp))
1469                                 return -EFAULT;
1470                         if (len) {
1471                                 if (len > table->maxlen)
1472                                         len = table->maxlen;
1473                                 if(copy_to_user(oldval, table->data, len))
1474                                         return -EFAULT;
1475                                 if(put_user(len, oldlenp))
1476                                         return -EFAULT;
1477                         }
1478                 }
1479                 if (newval && newlen) {
1480                         len = newlen;
1481                         if (len > table->maxlen)
1482                                 len = table->maxlen;
1483                         if(copy_from_user(table->data, newval, len))
1484                                 return -EFAULT;
1485                 }
1486         }
1487         return 0;
1488 }
1489 #endif /* CONFIG_SYSCTL_SYSCALL */
1490
1491 static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table)
1492 {
1493         for (; table->ctl_name || table->procname; table++) {
1494                 table->parent = parent;
1495                 if (table->child)
1496                         sysctl_set_parent(table, table->child);
1497         }
1498 }
1499
1500 static __init int sysctl_init(void)
1501 {
1502         sysctl_set_parent(NULL, root_table);
1503         return 0;
1504 }
1505
1506 core_initcall(sysctl_init);
1507
1508 /**
1509  * register_sysctl_table - register a sysctl hierarchy
1510  * @table: the top-level table structure
1511  *
1512  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1513  * array. An entry with a ctl_name of 0 terminates the table. 
1514  *
1515  * The members of the &struct ctl_table structure are used as follows:
1516  *
1517  * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1518  *            must be unique within that level of sysctl
1519  *
1520  * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1521  *            enter a sysctl file
1522  *
1523  * data - a pointer to data for use by proc_handler
1524  *
1525  * maxlen - the maximum size in bytes of the data
1526  *
1527  * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1528  *
1529  * child - a pointer to the child sysctl table if this entry is a directory, or
1530  *         %NULL.
1531  *
1532  * proc_handler - the text handler routine (described below)
1533  *
1534  * strategy - the strategy routine (described below)
1535  *
1536  * de - for internal use by the sysctl routines
1537  *
1538  * extra1, extra2 - extra pointers usable by the proc handler routines
1539  *
1540  * Leaf nodes in the sysctl tree will be represented by a single file
1541  * under /proc; non-leaf nodes will be represented by directories.
1542  *
1543  * sysctl(2) can automatically manage read and write requests through
1544  * the sysctl table.  The data and maxlen fields of the ctl_table
1545  * struct enable minimal validation of the values being written to be
1546  * performed, and the mode field allows minimal authentication.
1547  *
1548  * More sophisticated management can be enabled by the provision of a
1549  * strategy routine with the table entry.  This will be called before
1550  * any automatic read or write of the data is performed.
1551  *
1552  * The strategy routine may return
1553  *
1554  * < 0 - Error occurred (error is passed to user process)
1555  *
1556  * 0   - OK - proceed with automatic read or write.
1557  *
1558  * > 0 - OK - read or write has been done by the strategy routine, so
1559  *       return immediately.
1560  *
1561  * There must be a proc_handler routine for any terminal nodes
1562  * mirrored under /proc/sys (non-terminals are handled by a built-in
1563  * directory handler).  Several default handlers are available to
1564  * cover common cases -
1565  *
1566  * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1567  * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(), 
1568  * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1569  *
1570  * It is the handler's job to read the input buffer from user memory
1571  * and process it. The handler should return 0 on success.
1572  *
1573  * This routine returns %NULL on a failure to register, and a pointer
1574  * to the table header on success.
1575  */
1576 struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
1577 {
1578         struct ctl_table_header *tmp;
1579         tmp = kmalloc(sizeof(struct ctl_table_header), GFP_KERNEL);
1580         if (!tmp)
1581                 return NULL;
1582         tmp->ctl_table = table;
1583         INIT_LIST_HEAD(&tmp->ctl_entry);
1584         tmp->used = 0;
1585         tmp->unregistering = NULL;
1586         sysctl_set_parent(NULL, table);
1587         spin_lock(&sysctl_lock);
1588         list_add_tail(&tmp->ctl_entry, &root_table_header.ctl_entry);
1589         spin_unlock(&sysctl_lock);
1590         return tmp;
1591 }
1592
1593 /**
1594  * unregister_sysctl_table - unregister a sysctl table hierarchy
1595  * @header: the header returned from register_sysctl_table
1596  *
1597  * Unregisters the sysctl table and all children. proc entries may not
1598  * actually be removed until they are no longer used by anyone.
1599  */
1600 void unregister_sysctl_table(struct ctl_table_header * header)
1601 {
1602         might_sleep();
1603         spin_lock(&sysctl_lock);
1604         start_unregistering(header);
1605         spin_unlock(&sysctl_lock);
1606         kfree(header);
1607 }
1608
1609 #else /* !CONFIG_SYSCTL */
1610 struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
1611 {
1612         return NULL;
1613 }
1614
1615 void unregister_sysctl_table(struct ctl_table_header * table)
1616 {
1617 }
1618
1619 #endif /* CONFIG_SYSCTL */
1620
1621 /*
1622  * /proc/sys support
1623  */
1624
1625 #ifdef CONFIG_PROC_SYSCTL
1626
1627 static int _proc_do_string(void* data, int maxlen, int write,
1628                            struct file *filp, void __user *buffer,
1629                            size_t *lenp, loff_t *ppos)
1630 {
1631         size_t len;
1632         char __user *p;
1633         char c;
1634
1635         if (!data || !maxlen || !*lenp) {
1636                 *lenp = 0;
1637                 return 0;
1638         }
1639
1640         if (write) {
1641                 len = 0;
1642                 p = buffer;
1643                 while (len < *lenp) {
1644                         if (get_user(c, p++))
1645                                 return -EFAULT;
1646                         if (c == 0 || c == '\n')
1647                                 break;
1648                         len++;
1649                 }
1650                 if (len >= maxlen)
1651                         len = maxlen-1;
1652                 if(copy_from_user(data, buffer, len))
1653                         return -EFAULT;
1654                 ((char *) data)[len] = 0;
1655                 *ppos += *lenp;
1656         } else {
1657                 len = strlen(data);
1658                 if (len > maxlen)
1659                         len = maxlen;
1660
1661                 if (*ppos > len) {
1662                         *lenp = 0;
1663                         return 0;
1664                 }
1665
1666                 data += *ppos;
1667                 len  -= *ppos;
1668
1669                 if (len > *lenp)
1670                         len = *lenp;
1671                 if (len)
1672                         if(copy_to_user(buffer, data, len))
1673                                 return -EFAULT;
1674                 if (len < *lenp) {
1675                         if(put_user('\n', ((char __user *) buffer) + len))
1676                                 return -EFAULT;
1677                         len++;
1678                 }
1679                 *lenp = len;
1680                 *ppos += len;
1681         }
1682         return 0;
1683 }
1684
1685 /**
1686  * proc_dostring - read a string sysctl
1687  * @table: the sysctl table
1688  * @write: %TRUE if this is a write to the sysctl file
1689  * @filp: the file structure
1690  * @buffer: the user buffer
1691  * @lenp: the size of the user buffer
1692  * @ppos: file position
1693  *
1694  * Reads/writes a string from/to the user buffer. If the kernel
1695  * buffer provided is not large enough to hold the string, the
1696  * string is truncated. The copied string is %NULL-terminated.
1697  * If the string is being read by the user process, it is copied
1698  * and a newline '\n' is added. It is truncated if the buffer is
1699  * not large enough.
1700  *
1701  * Returns 0 on success.
1702  */
1703 int proc_dostring(struct ctl_table *table, int write, struct file *filp,
1704                   void __user *buffer, size_t *lenp, loff_t *ppos)
1705 {
1706         return _proc_do_string(table->data, table->maxlen, write, filp,
1707                                buffer, lenp, ppos);
1708 }
1709
1710
1711 static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp,
1712                                  int *valp,
1713                                  int write, void *data)
1714 {
1715         if (write) {
1716                 *valp = *negp ? -*lvalp : *lvalp;
1717         } else {
1718                 int val = *valp;
1719                 if (val < 0) {
1720                         *negp = -1;
1721                         *lvalp = (unsigned long)-val;
1722                 } else {
1723                         *negp = 0;
1724                         *lvalp = (unsigned long)val;
1725                 }
1726         }
1727         return 0;
1728 }
1729
1730 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
1731                   int write, struct file *filp, void __user *buffer,
1732                   size_t *lenp, loff_t *ppos,
1733                   int (*conv)(int *negp, unsigned long *lvalp, int *valp,
1734                               int write, void *data),
1735                   void *data)
1736 {
1737 #define TMPBUFLEN 21
1738         int *i, vleft, first=1, neg, val;
1739         unsigned long lval;
1740         size_t left, len;
1741         
1742         char buf[TMPBUFLEN], *p;
1743         char __user *s = buffer;
1744         
1745         if (!tbl_data || !table->maxlen || !*lenp ||
1746             (*ppos && !write)) {
1747                 *lenp = 0;
1748                 return 0;
1749         }
1750         
1751         i = (int *) tbl_data;
1752         vleft = table->maxlen / sizeof(*i);
1753         left = *lenp;
1754
1755         if (!conv)
1756                 conv = do_proc_dointvec_conv;
1757
1758         for (; left && vleft--; i++, first=0) {
1759                 if (write) {
1760                         while (left) {
1761                                 char c;
1762                                 if (get_user(c, s))
1763                                         return -EFAULT;
1764                                 if (!isspace(c))
1765                                         break;
1766                                 left--;
1767                                 s++;
1768                         }
1769                         if (!left)
1770                                 break;
1771                         neg = 0;
1772                         len = left;
1773                         if (len > sizeof(buf) - 1)
1774                                 len = sizeof(buf) - 1;
1775                         if (copy_from_user(buf, s, len))
1776                                 return -EFAULT;
1777                         buf[len] = 0;
1778                         p = buf;
1779                         if (*p == '-' && left > 1) {
1780                                 neg = 1;
1781                                 p++;
1782                         }
1783                         if (*p < '0' || *p > '9')
1784                                 break;
1785
1786                         lval = simple_strtoul(p, &p, 0);
1787
1788                         len = p-buf;
1789                         if ((len < left) && *p && !isspace(*p))
1790                                 break;
1791                         if (neg)
1792                                 val = -val;
1793                         s += len;
1794                         left -= len;
1795
1796                         if (conv(&neg, &lval, i, 1, data))
1797                                 break;
1798                 } else {
1799                         p = buf;
1800                         if (!first)
1801                                 *p++ = '\t';
1802         
1803                         if (conv(&neg, &lval, i, 0, data))
1804                                 break;
1805
1806                         sprintf(p, "%s%lu", neg ? "-" : "", lval);
1807                         len = strlen(buf);
1808                         if (len > left)
1809                                 len = left;
1810                         if(copy_to_user(s, buf, len))
1811                                 return -EFAULT;
1812                         left -= len;
1813                         s += len;
1814                 }
1815         }
1816
1817         if (!write && !first && left) {
1818                 if(put_user('\n', s))
1819                         return -EFAULT;
1820                 left--, s++;
1821         }
1822         if (write) {
1823                 while (left) {
1824                         char c;
1825                         if (get_user(c, s++))
1826                                 return -EFAULT;
1827                         if (!isspace(c))
1828                                 break;
1829                         left--;
1830                 }
1831         }
1832         if (write && first)
1833                 return -EINVAL;
1834         *lenp -= left;
1835         *ppos += *lenp;
1836         return 0;
1837 #undef TMPBUFLEN
1838 }
1839
1840 static int do_proc_dointvec(struct ctl_table *table, int write, struct file *filp,
1841                   void __user *buffer, size_t *lenp, loff_t *ppos,
1842                   int (*conv)(int *negp, unsigned long *lvalp, int *valp,
1843                               int write, void *data),
1844                   void *data)
1845 {
1846         return __do_proc_dointvec(table->data, table, write, filp,
1847                         buffer, lenp, ppos, conv, data);
1848 }
1849
1850 /**
1851  * proc_dointvec - read a vector of integers
1852  * @table: the sysctl table
1853  * @write: %TRUE if this is a write to the sysctl file
1854  * @filp: the file structure
1855  * @buffer: the user buffer
1856  * @lenp: the size of the user buffer
1857  * @ppos: file position
1858  *
1859  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1860  * values from/to the user buffer, treated as an ASCII string. 
1861  *
1862  * Returns 0 on success.
1863  */
1864 int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
1865                      void __user *buffer, size_t *lenp, loff_t *ppos)
1866 {
1867     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
1868                             NULL,NULL);
1869 }
1870
1871 #define OP_SET  0
1872 #define OP_AND  1
1873 #define OP_OR   2
1874
1875 static int do_proc_dointvec_bset_conv(int *negp, unsigned long *lvalp,
1876                                       int *valp,
1877                                       int write, void *data)
1878 {
1879         int op = *(int *)data;
1880         if (write) {
1881                 int val = *negp ? -*lvalp : *lvalp;
1882                 switch(op) {
1883                 case OP_SET:    *valp = val; break;
1884                 case OP_AND:    *valp &= val; break;
1885                 case OP_OR:     *valp |= val; break;
1886                 }
1887         } else {
1888                 int val = *valp;
1889                 if (val < 0) {
1890                         *negp = -1;
1891                         *lvalp = (unsigned long)-val;
1892                 } else {
1893                         *negp = 0;
1894                         *lvalp = (unsigned long)val;
1895                 }
1896         }
1897         return 0;
1898 }
1899
1900 /*
1901  *      init may raise the set.
1902  */
1903  
1904 int proc_dointvec_bset(struct ctl_table *table, int write, struct file *filp,
1905                         void __user *buffer, size_t *lenp, loff_t *ppos)
1906 {
1907         int op;
1908
1909         if (write && !capable(CAP_SYS_MODULE)) {
1910                 return -EPERM;
1911         }
1912
1913         op = is_init(current) ? OP_SET : OP_AND;
1914         return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
1915                                 do_proc_dointvec_bset_conv,&op);
1916 }
1917
1918 /*
1919  *      Taint values can only be increased
1920  */
1921 static int proc_dointvec_taint(struct ctl_table *table, int write, struct file *filp,
1922                                void __user *buffer, size_t *lenp, loff_t *ppos)
1923 {
1924         int op;
1925
1926         if (write && !capable(CAP_SYS_ADMIN))
1927                 return -EPERM;
1928
1929         op = OP_OR;
1930         return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
1931                                 do_proc_dointvec_bset_conv,&op);
1932 }
1933
1934 struct do_proc_dointvec_minmax_conv_param {
1935         int *min;
1936         int *max;
1937 };
1938
1939 static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp, 
1940                                         int *valp, 
1941                                         int write, void *data)
1942 {
1943         struct do_proc_dointvec_minmax_conv_param *param = data;
1944         if (write) {
1945                 int val = *negp ? -*lvalp : *lvalp;
1946                 if ((param->min && *param->min > val) ||
1947                     (param->max && *param->max < val))
1948                         return -EINVAL;
1949                 *valp = val;
1950         } else {
1951                 int val = *valp;
1952                 if (val < 0) {
1953                         *negp = -1;
1954                         *lvalp = (unsigned long)-val;
1955                 } else {
1956                         *negp = 0;
1957                         *lvalp = (unsigned long)val;
1958                 }
1959         }
1960         return 0;
1961 }
1962
1963 /**
1964  * proc_dointvec_minmax - read a vector of integers with min/max values
1965  * @table: the sysctl table
1966  * @write: %TRUE if this is a write to the sysctl file
1967  * @filp: the file structure
1968  * @buffer: the user buffer
1969  * @lenp: the size of the user buffer
1970  * @ppos: file position
1971  *
1972  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1973  * values from/to the user buffer, treated as an ASCII string.
1974  *
1975  * This routine will ensure the values are within the range specified by
1976  * table->extra1 (min) and table->extra2 (max).
1977  *
1978  * Returns 0 on success.
1979  */
1980 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
1981                   void __user *buffer, size_t *lenp, loff_t *ppos)
1982 {
1983         struct do_proc_dointvec_minmax_conv_param param = {
1984                 .min = (int *) table->extra1,
1985                 .max = (int *) table->extra2,
1986         };
1987         return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
1988                                 do_proc_dointvec_minmax_conv, &param);
1989 }
1990
1991 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
1992                                      struct file *filp,
1993                                      void __user *buffer,
1994                                      size_t *lenp, loff_t *ppos,
1995                                      unsigned long convmul,
1996                                      unsigned long convdiv)
1997 {
1998 #define TMPBUFLEN 21
1999         unsigned long *i, *min, *max, val;
2000         int vleft, first=1, neg;
2001         size_t len, left;
2002         char buf[TMPBUFLEN], *p;
2003         char __user *s = buffer;
2004         
2005         if (!data || !table->maxlen || !*lenp ||
2006             (*ppos && !write)) {
2007                 *lenp = 0;
2008                 return 0;
2009         }
2010         
2011         i = (unsigned long *) data;
2012         min = (unsigned long *) table->extra1;
2013         max = (unsigned long *) table->extra2;
2014         vleft = table->maxlen / sizeof(unsigned long);
2015         left = *lenp;
2016         
2017         for (; left && vleft--; i++, min++, max++, first=0) {
2018                 if (write) {
2019                         while (left) {
2020                                 char c;
2021                                 if (get_user(c, s))
2022                                         return -EFAULT;
2023                                 if (!isspace(c))
2024                                         break;
2025                                 left--;
2026                                 s++;
2027                         }
2028                         if (!left)
2029                                 break;
2030                         neg = 0;
2031                         len = left;
2032                         if (len > TMPBUFLEN-1)
2033                                 len = TMPBUFLEN-1;
2034                         if (copy_from_user(buf, s, len))
2035                                 return -EFAULT;
2036                         buf[len] = 0;
2037                         p = buf;
2038                         if (*p == '-' && left > 1) {
2039                                 neg = 1;
2040                                 p++;
2041                         }
2042                         if (*p < '0' || *p > '9')
2043                                 break;
2044                         val = simple_strtoul(p, &p, 0) * convmul / convdiv ;
2045                         len = p-buf;
2046                         if ((len < left) && *p && !isspace(*p))
2047                                 break;
2048                         if (neg)
2049                                 val = -val;
2050                         s += len;
2051                         left -= len;
2052
2053                         if(neg)
2054                                 continue;
2055                         if ((min && val < *min) || (max && val > *max))
2056                                 continue;
2057                         *i = val;
2058                 } else {
2059                         p = buf;
2060                         if (!first)
2061                                 *p++ = '\t';
2062                         sprintf(p, "%lu", convdiv * (*i) / convmul);
2063                         len = strlen(buf);
2064                         if (len > left)
2065                                 len = left;
2066                         if(copy_to_user(s, buf, len))
2067                                 return -EFAULT;
2068                         left -= len;
2069                         s += len;
2070                 }
2071         }
2072
2073         if (!write && !first && left) {
2074                 if(put_user('\n', s))
2075                         return -EFAULT;
2076                 left--, s++;
2077         }
2078         if (write) {
2079                 while (left) {
2080                         char c;
2081                         if (get_user(c, s++))
2082                                 return -EFAULT;
2083                         if (!isspace(c))
2084                                 break;
2085                         left--;
2086                 }
2087         }
2088         if (write && first)
2089                 return -EINVAL;
2090         *lenp -= left;
2091         *ppos += *lenp;
2092         return 0;
2093 #undef TMPBUFLEN
2094 }
2095
2096 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2097                                      struct file *filp,
2098                                      void __user *buffer,
2099                                      size_t *lenp, loff_t *ppos,
2100                                      unsigned long convmul,
2101                                      unsigned long convdiv)
2102 {
2103         return __do_proc_doulongvec_minmax(table->data, table, write,
2104                         filp, buffer, lenp, ppos, convmul, convdiv);
2105 }
2106
2107 /**
2108  * proc_doulongvec_minmax - read a vector of long integers with min/max values
2109  * @table: the sysctl table
2110  * @write: %TRUE if this is a write to the sysctl file
2111  * @filp: the file structure
2112  * @buffer: the user buffer
2113  * @lenp: the size of the user buffer
2114  * @ppos: file position
2115  *
2116  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2117  * values from/to the user buffer, treated as an ASCII string.
2118  *
2119  * This routine will ensure the values are within the range specified by
2120  * table->extra1 (min) and table->extra2 (max).
2121  *
2122  * Returns 0 on success.
2123  */
2124 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
2125                            void __user *buffer, size_t *lenp, loff_t *ppos)
2126 {
2127     return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l);
2128 }
2129
2130 /**
2131  * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2132  * @table: the sysctl table
2133  * @write: %TRUE if this is a write to the sysctl file
2134  * @filp: the file structure
2135  * @buffer: the user buffer
2136  * @lenp: the size of the user buffer
2137  * @ppos: file position
2138  *
2139  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2140  * values from/to the user buffer, treated as an ASCII string. The values
2141  * are treated as milliseconds, and converted to jiffies when they are stored.
2142  *
2143  * This routine will ensure the values are within the range specified by
2144  * table->extra1 (min) and table->extra2 (max).
2145  *
2146  * Returns 0 on success.
2147  */
2148 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2149                                       struct file *filp,
2150                                       void __user *buffer,
2151                                       size_t *lenp, loff_t *ppos)
2152 {
2153     return do_proc_doulongvec_minmax(table, write, filp, buffer,
2154                                      lenp, ppos, HZ, 1000l);
2155 }
2156
2157
2158 static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp,
2159                                          int *valp,
2160                                          int write, void *data)
2161 {
2162         if (write) {
2163                 if (*lvalp > LONG_MAX / HZ)
2164                         return 1;
2165                 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2166         } else {
2167                 int val = *valp;
2168                 unsigned long lval;
2169                 if (val < 0) {
2170                         *negp = -1;
2171                         lval = (unsigned long)-val;
2172                 } else {
2173                         *negp = 0;
2174                         lval = (unsigned long)val;
2175                 }
2176                 *lvalp = lval / HZ;
2177         }
2178         return 0;
2179 }
2180
2181 static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp,
2182                                                 int *valp,
2183                                                 int write, void *data)
2184 {
2185         if (write) {
2186                 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2187                         return 1;
2188                 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2189         } else {
2190                 int val = *valp;
2191                 unsigned long lval;
2192                 if (val < 0) {
2193                         *negp = -1;
2194                         lval = (unsigned long)-val;
2195                 } else {
2196                         *negp = 0;
2197                         lval = (unsigned long)val;
2198                 }
2199                 *lvalp = jiffies_to_clock_t(lval);
2200         }
2201         return 0;
2202 }
2203
2204 static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp,
2205                                             int *valp,
2206                                             int write, void *data)
2207 {
2208         if (write) {
2209                 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2210         } else {
2211                 int val = *valp;
2212                 unsigned long lval;
2213                 if (val < 0) {
2214                         *negp = -1;
2215                         lval = (unsigned long)-val;
2216                 } else {
2217                         *negp = 0;
2218                         lval = (unsigned long)val;
2219                 }
2220                 *lvalp = jiffies_to_msecs(lval);
2221         }
2222         return 0;
2223 }
2224
2225 /**
2226  * proc_dointvec_jiffies - read a vector of integers as seconds
2227  * @table: the sysctl table
2228  * @write: %TRUE if this is a write to the sysctl file
2229  * @filp: the file structure
2230  * @buffer: the user buffer
2231  * @lenp: the size of the user buffer
2232  * @ppos: file position
2233  *
2234  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2235  * values from/to the user buffer, treated as an ASCII string. 
2236  * The values read are assumed to be in seconds, and are converted into
2237  * jiffies.
2238  *
2239  * Returns 0 on success.
2240  */
2241 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
2242                           void __user *buffer, size_t *lenp, loff_t *ppos)
2243 {
2244     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2245                             do_proc_dointvec_jiffies_conv,NULL);
2246 }
2247
2248 /**
2249  * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2250  * @table: the sysctl table
2251  * @write: %TRUE if this is a write to the sysctl file
2252  * @filp: the file structure
2253  * @buffer: the user buffer
2254  * @lenp: the size of the user buffer
2255  * @ppos: pointer to the file position
2256  *
2257  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2258  * values from/to the user buffer, treated as an ASCII string. 
2259  * The values read are assumed to be in 1/USER_HZ seconds, and 
2260  * are converted into jiffies.
2261  *
2262  * Returns 0 on success.
2263  */
2264 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
2265                                  void __user *buffer, size_t *lenp, loff_t *ppos)
2266 {
2267     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2268                             do_proc_dointvec_userhz_jiffies_conv,NULL);
2269 }
2270
2271 /**
2272  * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2273  * @table: the sysctl table
2274  * @write: %TRUE if this is a write to the sysctl file
2275  * @filp: the file structure
2276  * @buffer: the user buffer
2277  * @lenp: the size of the user buffer
2278  * @ppos: file position
2279  * @ppos: the current position in the file
2280  *
2281  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2282  * values from/to the user buffer, treated as an ASCII string. 
2283  * The values read are assumed to be in 1/1000 seconds, and 
2284  * are converted into jiffies.
2285  *
2286  * Returns 0 on success.
2287  */
2288 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
2289                              void __user *buffer, size_t *lenp, loff_t *ppos)
2290 {
2291         return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2292                                 do_proc_dointvec_ms_jiffies_conv, NULL);
2293 }
2294
2295 static int proc_do_cad_pid(struct ctl_table *table, int write, struct file *filp,
2296                            void __user *buffer, size_t *lenp, loff_t *ppos)
2297 {
2298         struct pid *new_pid;
2299         pid_t tmp;
2300         int r;
2301
2302         tmp = pid_nr(cad_pid);
2303
2304         r = __do_proc_dointvec(&tmp, table, write, filp, buffer,
2305                                lenp, ppos, NULL, NULL);
2306         if (r || !write)
2307                 return r;
2308
2309         new_pid = find_get_pid(tmp);
2310         if (!new_pid)
2311                 return -ESRCH;
2312
2313         put_pid(xchg(&cad_pid, new_pid));
2314         return 0;
2315 }
2316
2317 #else /* CONFIG_PROC_FS */
2318
2319 int proc_dostring(struct ctl_table *table, int write, struct file *filp,
2320                   void __user *buffer, size_t *lenp, loff_t *ppos)
2321 {
2322         return -ENOSYS;
2323 }
2324
2325 int proc_dointvec(struct ctl_table *table, int write, struct file *filp,
2326                   void __user *buffer, size_t *lenp, loff_t *ppos)
2327 {
2328         return -ENOSYS;
2329 }
2330
2331 int proc_dointvec_bset(struct ctl_table *table, int write, struct file *filp,
2332                         void __user *buffer, size_t *lenp, loff_t *ppos)
2333 {
2334         return -ENOSYS;
2335 }
2336
2337 int proc_dointvec_minmax(struct ctl_table *table, int write, struct file *filp,
2338                     void __user *buffer, size_t *lenp, loff_t *ppos)
2339 {
2340         return -ENOSYS;
2341 }
2342
2343 int proc_dointvec_jiffies(struct ctl_table *table, int write, struct file *filp,
2344                     void __user *buffer, size_t *lenp, loff_t *ppos)
2345 {
2346         return -ENOSYS;
2347 }
2348
2349 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write, struct file *filp,
2350                     void __user *buffer, size_t *lenp, loff_t *ppos)
2351 {
2352         return -ENOSYS;
2353 }
2354
2355 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, struct file *filp,
2356                              void __user *buffer, size_t *lenp, loff_t *ppos)
2357 {
2358         return -ENOSYS;
2359 }
2360
2361 int proc_doulongvec_minmax(struct ctl_table *table, int write, struct file *filp,
2362                     void __user *buffer, size_t *lenp, loff_t *ppos)
2363 {
2364         return -ENOSYS;
2365 }
2366
2367 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2368                                       struct file *filp,
2369                                       void __user *buffer,
2370                                       size_t *lenp, loff_t *ppos)
2371 {
2372     return -ENOSYS;
2373 }
2374
2375
2376 #endif /* CONFIG_PROC_FS */
2377
2378
2379 #ifdef CONFIG_SYSCTL_SYSCALL
2380 /*
2381  * General sysctl support routines 
2382  */
2383
2384 /* The generic string strategy routine: */
2385 int sysctl_string(struct ctl_table *table, int __user *name, int nlen,
2386                   void __user *oldval, size_t __user *oldlenp,
2387                   void __user *newval, size_t newlen)
2388 {
2389         if (!table->data || !table->maxlen) 
2390                 return -ENOTDIR;
2391         
2392         if (oldval && oldlenp) {
2393                 size_t bufsize;
2394                 if (get_user(bufsize, oldlenp))
2395                         return -EFAULT;
2396                 if (bufsize) {
2397                         size_t len = strlen(table->data), copied;
2398
2399                         /* This shouldn't trigger for a well-formed sysctl */
2400                         if (len > table->maxlen)
2401                                 len = table->maxlen;
2402
2403                         /* Copy up to a max of bufsize-1 bytes of the string */
2404                         copied = (len >= bufsize) ? bufsize - 1 : len;
2405
2406                         if (copy_to_user(oldval, table->data, copied) ||
2407                             put_user(0, (char __user *)(oldval + copied)))
2408                                 return -EFAULT;
2409                         if (put_user(len, oldlenp))
2410                                 return -EFAULT;
2411                 }
2412         }
2413         if (newval && newlen) {
2414                 size_t len = newlen;
2415                 if (len > table->maxlen)
2416                         len = table->maxlen;
2417                 if(copy_from_user(table->data, newval, len))
2418                         return -EFAULT;
2419                 if (len == table->maxlen)
2420                         len--;
2421                 ((char *) table->data)[len] = 0;
2422         }
2423         return 1;
2424 }
2425
2426 /*
2427  * This function makes sure that all of the integers in the vector
2428  * are between the minimum and maximum values given in the arrays
2429  * table->extra1 and table->extra2, respectively.
2430  */
2431 int sysctl_intvec(struct ctl_table *table, int __user *name, int nlen,
2432                 void __user *oldval, size_t __user *oldlenp,
2433                 void __user *newval, size_t newlen)
2434 {
2435
2436         if (newval && newlen) {
2437                 int __user *vec = (int __user *) newval;
2438                 int *min = (int *) table->extra1;
2439                 int *max = (int *) table->extra2;
2440                 size_t length;
2441                 int i;
2442
2443                 if (newlen % sizeof(int) != 0)
2444                         return -EINVAL;
2445
2446                 if (!table->extra1 && !table->extra2)
2447                         return 0;
2448
2449                 if (newlen > table->maxlen)
2450                         newlen = table->maxlen;
2451                 length = newlen / sizeof(int);
2452
2453                 for (i = 0; i < length; i++) {
2454                         int value;
2455                         if (get_user(value, vec + i))
2456                                 return -EFAULT;
2457                         if (min && value < min[i])
2458                                 return -EINVAL;
2459                         if (max && value > max[i])
2460                                 return -EINVAL;
2461                 }
2462         }
2463         return 0;
2464 }
2465
2466 /* Strategy function to convert jiffies to seconds */ 
2467 int sysctl_jiffies(struct ctl_table *table, int __user *name, int nlen,
2468                 void __user *oldval, size_t __user *oldlenp,
2469                 void __user *newval, size_t newlen)
2470 {
2471         if (oldval && oldlenp) {
2472                 size_t olen;
2473
2474                 if (get_user(olen, oldlenp))
2475                         return -EFAULT;
2476                 if (olen) {
2477                         int val;
2478
2479                         if (olen < sizeof(int))
2480                                 return -EINVAL;
2481
2482                         val = *(int *)(table->data) / HZ;
2483                         if (put_user(val, (int __user *)oldval))
2484                                 return -EFAULT;
2485                         if (put_user(sizeof(int), oldlenp))
2486                                 return -EFAULT;
2487                 }
2488         }
2489         if (newval && newlen) { 
2490                 int new;
2491                 if (newlen != sizeof(int))
2492                         return -EINVAL; 
2493                 if (get_user(new, (int __user *)newval))
2494                         return -EFAULT;
2495                 *(int *)(table->data) = new*HZ; 
2496         }
2497         return 1;
2498 }
2499
2500 /* Strategy function to convert jiffies to seconds */ 
2501 int sysctl_ms_jiffies(struct ctl_table *table, int __user *name, int nlen,
2502                 void __user *oldval, size_t __user *oldlenp,
2503                 void __user *newval, size_t newlen)
2504 {
2505         if (oldval && oldlenp) {
2506                 size_t olen;
2507
2508                 if (get_user(olen, oldlenp))
2509                         return -EFAULT;
2510                 if (olen) {
2511                         int val;
2512
2513                         if (olen < sizeof(int))
2514                                 return -EINVAL;
2515
2516                         val = jiffies_to_msecs(*(int *)(table->data));
2517                         if (put_user(val, (int __user *)oldval))
2518                                 return -EFAULT;
2519                         if (put_user(sizeof(int), oldlenp))
2520                                 return -EFAULT;
2521                 }
2522         }
2523         if (newval && newlen) { 
2524                 int new;
2525                 if (newlen != sizeof(int))
2526                         return -EINVAL; 
2527                 if (get_user(new, (int __user *)newval))
2528                         return -EFAULT;
2529                 *(int *)(table->data) = msecs_to_jiffies(new);
2530         }
2531         return 1;
2532 }
2533
2534
2535
2536 #else /* CONFIG_SYSCTL_SYSCALL */
2537
2538
2539 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
2540 {
2541         static int msg_count;
2542         struct __sysctl_args tmp;
2543         int name[CTL_MAXNAME];
2544         int i;
2545
2546         /* Read in the sysctl name for better debug message logging */
2547         if (copy_from_user(&tmp, args, sizeof(tmp)))
2548                 return -EFAULT;
2549         if (tmp.nlen <= 0 || tmp.nlen >= CTL_MAXNAME)
2550                 return -ENOTDIR;
2551         for (i = 0; i < tmp.nlen; i++)
2552                 if (get_user(name[i], tmp.name + i))
2553                         return -EFAULT;
2554
2555         /* Ignore accesses to kernel.version */
2556         if ((tmp.nlen == 2) && (name[0] == CTL_KERN) && (name[1] == KERN_VERSION))
2557                 goto out;
2558
2559         if (msg_count < 5) {
2560                 msg_count++;
2561                 printk(KERN_INFO
2562                         "warning: process `%s' used the removed sysctl "
2563                         "system call with ", current->comm);
2564                 for (i = 0; i < tmp.nlen; i++)
2565                         printk("%d.", name[i]);
2566                 printk("\n");
2567         }
2568 out:
2569         return -ENOSYS;
2570 }
2571
2572 int sysctl_string(struct ctl_table *table, int __user *name, int nlen,
2573                   void __user *oldval, size_t __user *oldlenp,
2574                   void __user *newval, size_t newlen)
2575 {
2576         return -ENOSYS;
2577 }
2578
2579 int sysctl_intvec(struct ctl_table *table, int __user *name, int nlen,
2580                 void __user *oldval, size_t __user *oldlenp,
2581                 void __user *newval, size_t newlen)
2582 {
2583         return -ENOSYS;
2584 }
2585
2586 int sysctl_jiffies(struct ctl_table *table, int __user *name, int nlen,
2587                 void __user *oldval, size_t __user *oldlenp,
2588                 void __user *newval, size_t newlen)
2589 {
2590         return -ENOSYS;
2591 }
2592
2593 int sysctl_ms_jiffies(struct ctl_table *table, int __user *name, int nlen,
2594                 void __user *oldval, size_t __user *oldlenp,
2595                 void __user *newval, size_t newlen)
2596 {
2597         return -ENOSYS;
2598 }
2599
2600 #endif /* CONFIG_SYSCTL_SYSCALL */
2601
2602 /*
2603  * No sense putting this after each symbol definition, twice,
2604  * exception granted :-)
2605  */
2606 EXPORT_SYMBOL(proc_dointvec);
2607 EXPORT_SYMBOL(proc_dointvec_jiffies);
2608 EXPORT_SYMBOL(proc_dointvec_minmax);
2609 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2610 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2611 EXPORT_SYMBOL(proc_dostring);
2612 EXPORT_SYMBOL(proc_doulongvec_minmax);
2613 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
2614 EXPORT_SYMBOL(register_sysctl_table);
2615 EXPORT_SYMBOL(sysctl_intvec);
2616 EXPORT_SYMBOL(sysctl_jiffies);
2617 EXPORT_SYMBOL(sysctl_ms_jiffies);
2618 EXPORT_SYMBOL(sysctl_string);
2619 EXPORT_SYMBOL(unregister_sysctl_table);