xref: /openbmc/linux/kernel/sysctl.c (revision d5cb9783536a41df9f9cba5b0a1d78047ed787f7)
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/config.h>
22 #include <linux/module.h>
23 #include <linux/mm.h>
24 #include <linux/swap.h>
25 #include <linux/slab.h>
26 #include <linux/sysctl.h>
27 #include <linux/proc_fs.h>
28 #include <linux/ctype.h>
29 #include <linux/utsname.h>
30 #include <linux/capability.h>
31 #include <linux/smp_lock.h>
32 #include <linux/init.h>
33 #include <linux/kernel.h>
34 #include <linux/net.h>
35 #include <linux/sysrq.h>
36 #include <linux/highuid.h>
37 #include <linux/writeback.h>
38 #include <linux/hugetlb.h>
39 #include <linux/security.h>
40 #include <linux/initrd.h>
41 #include <linux/times.h>
42 #include <linux/limits.h>
43 #include <linux/dcache.h>
44 #include <linux/syscalls.h>
45 
46 #include <asm/uaccess.h>
47 #include <asm/processor.h>
48 
49 #ifdef CONFIG_ROOT_NFS
50 #include <linux/nfs_fs.h>
51 #endif
52 
53 #if defined(CONFIG_SYSCTL)
54 
55 /* External variables not in a header file. */
56 extern int C_A_D;
57 extern int sysctl_overcommit_memory;
58 extern int sysctl_overcommit_ratio;
59 extern int max_threads;
60 extern int sysrq_enabled;
61 extern int core_uses_pid;
62 extern int suid_dumpable;
63 extern char core_pattern[];
64 extern int cad_pid;
65 extern int pid_max;
66 extern int min_free_kbytes;
67 extern int printk_ratelimit_jiffies;
68 extern int printk_ratelimit_burst;
69 extern int pid_max_min, pid_max_max;
70 
71 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
72 int unknown_nmi_panic;
73 extern int proc_unknown_nmi_panic(ctl_table *, int, struct file *,
74 				  void __user *, size_t *, loff_t *);
75 #endif
76 
77 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
78 static int maxolduid = 65535;
79 static int minolduid;
80 
81 static int ngroups_max = NGROUPS_MAX;
82 
83 #ifdef CONFIG_KMOD
84 extern char modprobe_path[];
85 #endif
86 #ifdef CONFIG_HOTPLUG
87 extern char hotplug_path[];
88 #endif
89 #ifdef CONFIG_CHR_DEV_SG
90 extern int sg_big_buff;
91 #endif
92 #ifdef CONFIG_SYSVIPC
93 extern size_t shm_ctlmax;
94 extern size_t shm_ctlall;
95 extern int shm_ctlmni;
96 extern int msg_ctlmax;
97 extern int msg_ctlmnb;
98 extern int msg_ctlmni;
99 extern int sem_ctls[];
100 #endif
101 
102 #ifdef __sparc__
103 extern char reboot_command [];
104 extern int stop_a_enabled;
105 extern int scons_pwroff;
106 #endif
107 
108 #ifdef __hppa__
109 extern int pwrsw_enabled;
110 extern int unaligned_enabled;
111 #endif
112 
113 #ifdef CONFIG_ARCH_S390
114 #ifdef CONFIG_MATHEMU
115 extern int sysctl_ieee_emulation_warnings;
116 #endif
117 extern int sysctl_userprocess_debug;
118 extern int spin_retry;
119 #endif
120 
121 extern int sysctl_hz_timer;
122 
123 #ifdef CONFIG_BSD_PROCESS_ACCT
124 extern int acct_parm[];
125 #endif
126 
127 int randomize_va_space = 1;
128 
129 static int parse_table(int __user *, int, void __user *, size_t __user *, void __user *, size_t,
130 		       ctl_table *, void **);
131 static int proc_doutsstring(ctl_table *table, int write, struct file *filp,
132 		  void __user *buffer, size_t *lenp, loff_t *ppos);
133 
134 static ctl_table root_table[];
135 static struct ctl_table_header root_table_header =
136 	{ root_table, LIST_HEAD_INIT(root_table_header.ctl_entry) };
137 
138 static ctl_table kern_table[];
139 static ctl_table vm_table[];
140 static ctl_table proc_table[];
141 static ctl_table fs_table[];
142 static ctl_table debug_table[];
143 static ctl_table dev_table[];
144 extern ctl_table random_table[];
145 #ifdef CONFIG_UNIX98_PTYS
146 extern ctl_table pty_table[];
147 #endif
148 #ifdef CONFIG_INOTIFY
149 extern ctl_table inotify_table[];
150 #endif
151 
152 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
153 int sysctl_legacy_va_layout;
154 #endif
155 
156 /* /proc declarations: */
157 
158 #ifdef CONFIG_PROC_FS
159 
160 static ssize_t proc_readsys(struct file *, char __user *, size_t, loff_t *);
161 static ssize_t proc_writesys(struct file *, const char __user *, size_t, loff_t *);
162 static int proc_opensys(struct inode *, struct file *);
163 
164 struct file_operations proc_sys_file_operations = {
165 	.open		= proc_opensys,
166 	.read		= proc_readsys,
167 	.write		= proc_writesys,
168 };
169 
170 extern struct proc_dir_entry *proc_sys_root;
171 
172 static void register_proc_table(ctl_table *, struct proc_dir_entry *);
173 static void unregister_proc_table(ctl_table *, struct proc_dir_entry *);
174 #endif
175 
176 /* The default sysctl tables: */
177 
178 static ctl_table root_table[] = {
179 	{
180 		.ctl_name	= CTL_KERN,
181 		.procname	= "kernel",
182 		.mode		= 0555,
183 		.child		= kern_table,
184 	},
185 	{
186 		.ctl_name	= CTL_VM,
187 		.procname	= "vm",
188 		.mode		= 0555,
189 		.child		= vm_table,
190 	},
191 #ifdef CONFIG_NET
192 	{
193 		.ctl_name	= CTL_NET,
194 		.procname	= "net",
195 		.mode		= 0555,
196 		.child		= net_table,
197 	},
198 #endif
199 	{
200 		.ctl_name	= CTL_PROC,
201 		.procname	= "proc",
202 		.mode		= 0555,
203 		.child		= proc_table,
204 	},
205 	{
206 		.ctl_name	= CTL_FS,
207 		.procname	= "fs",
208 		.mode		= 0555,
209 		.child		= fs_table,
210 	},
211 	{
212 		.ctl_name	= CTL_DEBUG,
213 		.procname	= "debug",
214 		.mode		= 0555,
215 		.child		= debug_table,
216 	},
217 	{
218 		.ctl_name	= CTL_DEV,
219 		.procname	= "dev",
220 		.mode		= 0555,
221 		.child		= dev_table,
222 	},
223 
224 	{ .ctl_name = 0 }
225 };
226 
227 static ctl_table kern_table[] = {
228 	{
229 		.ctl_name	= KERN_OSTYPE,
230 		.procname	= "ostype",
231 		.data		= system_utsname.sysname,
232 		.maxlen		= sizeof(system_utsname.sysname),
233 		.mode		= 0444,
234 		.proc_handler	= &proc_doutsstring,
235 		.strategy	= &sysctl_string,
236 	},
237 	{
238 		.ctl_name	= KERN_OSRELEASE,
239 		.procname	= "osrelease",
240 		.data		= system_utsname.release,
241 		.maxlen		= sizeof(system_utsname.release),
242 		.mode		= 0444,
243 		.proc_handler	= &proc_doutsstring,
244 		.strategy	= &sysctl_string,
245 	},
246 	{
247 		.ctl_name	= KERN_VERSION,
248 		.procname	= "version",
249 		.data		= system_utsname.version,
250 		.maxlen		= sizeof(system_utsname.version),
251 		.mode		= 0444,
252 		.proc_handler	= &proc_doutsstring,
253 		.strategy	= &sysctl_string,
254 	},
255 	{
256 		.ctl_name	= KERN_NODENAME,
257 		.procname	= "hostname",
258 		.data		= system_utsname.nodename,
259 		.maxlen		= sizeof(system_utsname.nodename),
260 		.mode		= 0644,
261 		.proc_handler	= &proc_doutsstring,
262 		.strategy	= &sysctl_string,
263 	},
264 	{
265 		.ctl_name	= KERN_DOMAINNAME,
266 		.procname	= "domainname",
267 		.data		= system_utsname.domainname,
268 		.maxlen		= sizeof(system_utsname.domainname),
269 		.mode		= 0644,
270 		.proc_handler	= &proc_doutsstring,
271 		.strategy	= &sysctl_string,
272 	},
273 	{
274 		.ctl_name	= KERN_PANIC,
275 		.procname	= "panic",
276 		.data		= &panic_timeout,
277 		.maxlen		= sizeof(int),
278 		.mode		= 0644,
279 		.proc_handler	= &proc_dointvec,
280 	},
281 	{
282 		.ctl_name	= KERN_CORE_USES_PID,
283 		.procname	= "core_uses_pid",
284 		.data		= &core_uses_pid,
285 		.maxlen		= sizeof(int),
286 		.mode		= 0644,
287 		.proc_handler	= &proc_dointvec,
288 	},
289 	{
290 		.ctl_name	= KERN_CORE_PATTERN,
291 		.procname	= "core_pattern",
292 		.data		= core_pattern,
293 		.maxlen		= 64,
294 		.mode		= 0644,
295 		.proc_handler	= &proc_dostring,
296 		.strategy	= &sysctl_string,
297 	},
298 	{
299 		.ctl_name	= KERN_TAINTED,
300 		.procname	= "tainted",
301 		.data		= &tainted,
302 		.maxlen		= sizeof(int),
303 		.mode		= 0444,
304 		.proc_handler	= &proc_dointvec,
305 	},
306 	{
307 		.ctl_name	= KERN_CAP_BSET,
308 		.procname	= "cap-bound",
309 		.data		= &cap_bset,
310 		.maxlen		= sizeof(kernel_cap_t),
311 		.mode		= 0600,
312 		.proc_handler	= &proc_dointvec_bset,
313 	},
314 #ifdef CONFIG_BLK_DEV_INITRD
315 	{
316 		.ctl_name	= KERN_REALROOTDEV,
317 		.procname	= "real-root-dev",
318 		.data		= &real_root_dev,
319 		.maxlen		= sizeof(int),
320 		.mode		= 0644,
321 		.proc_handler	= &proc_dointvec,
322 	},
323 #endif
324 #ifdef __sparc__
325 	{
326 		.ctl_name	= KERN_SPARC_REBOOT,
327 		.procname	= "reboot-cmd",
328 		.data		= reboot_command,
329 		.maxlen		= 256,
330 		.mode		= 0644,
331 		.proc_handler	= &proc_dostring,
332 		.strategy	= &sysctl_string,
333 	},
334 	{
335 		.ctl_name	= KERN_SPARC_STOP_A,
336 		.procname	= "stop-a",
337 		.data		= &stop_a_enabled,
338 		.maxlen		= sizeof (int),
339 		.mode		= 0644,
340 		.proc_handler	= &proc_dointvec,
341 	},
342 	{
343 		.ctl_name	= KERN_SPARC_SCONS_PWROFF,
344 		.procname	= "scons-poweroff",
345 		.data		= &scons_pwroff,
346 		.maxlen		= sizeof (int),
347 		.mode		= 0644,
348 		.proc_handler	= &proc_dointvec,
349 	},
350 #endif
351 #ifdef __hppa__
352 	{
353 		.ctl_name	= KERN_HPPA_PWRSW,
354 		.procname	= "soft-power",
355 		.data		= &pwrsw_enabled,
356 		.maxlen		= sizeof (int),
357 	 	.mode		= 0644,
358 		.proc_handler	= &proc_dointvec,
359 	},
360 	{
361 		.ctl_name	= KERN_HPPA_UNALIGNED,
362 		.procname	= "unaligned-trap",
363 		.data		= &unaligned_enabled,
364 		.maxlen		= sizeof (int),
365 		.mode		= 0644,
366 		.proc_handler	= &proc_dointvec,
367 	},
368 #endif
369 	{
370 		.ctl_name	= KERN_CTLALTDEL,
371 		.procname	= "ctrl-alt-del",
372 		.data		= &C_A_D,
373 		.maxlen		= sizeof(int),
374 		.mode		= 0644,
375 		.proc_handler	= &proc_dointvec,
376 	},
377 	{
378 		.ctl_name	= KERN_PRINTK,
379 		.procname	= "printk",
380 		.data		= &console_loglevel,
381 		.maxlen		= 4*sizeof(int),
382 		.mode		= 0644,
383 		.proc_handler	= &proc_dointvec,
384 	},
385 #ifdef CONFIG_KMOD
386 	{
387 		.ctl_name	= KERN_MODPROBE,
388 		.procname	= "modprobe",
389 		.data		= &modprobe_path,
390 		.maxlen		= KMOD_PATH_LEN,
391 		.mode		= 0644,
392 		.proc_handler	= &proc_dostring,
393 		.strategy	= &sysctl_string,
394 	},
395 #endif
396 #ifdef CONFIG_HOTPLUG
397 	{
398 		.ctl_name	= KERN_HOTPLUG,
399 		.procname	= "hotplug",
400 		.data		= &hotplug_path,
401 		.maxlen		= HOTPLUG_PATH_LEN,
402 		.mode		= 0644,
403 		.proc_handler	= &proc_dostring,
404 		.strategy	= &sysctl_string,
405 	},
406 #endif
407 #ifdef CONFIG_CHR_DEV_SG
408 	{
409 		.ctl_name	= KERN_SG_BIG_BUFF,
410 		.procname	= "sg-big-buff",
411 		.data		= &sg_big_buff,
412 		.maxlen		= sizeof (int),
413 		.mode		= 0444,
414 		.proc_handler	= &proc_dointvec,
415 	},
416 #endif
417 #ifdef CONFIG_BSD_PROCESS_ACCT
418 	{
419 		.ctl_name	= KERN_ACCT,
420 		.procname	= "acct",
421 		.data		= &acct_parm,
422 		.maxlen		= 3*sizeof(int),
423 		.mode		= 0644,
424 		.proc_handler	= &proc_dointvec,
425 	},
426 #endif
427 #ifdef CONFIG_SYSVIPC
428 	{
429 		.ctl_name	= KERN_SHMMAX,
430 		.procname	= "shmmax",
431 		.data		= &shm_ctlmax,
432 		.maxlen		= sizeof (size_t),
433 		.mode		= 0644,
434 		.proc_handler	= &proc_doulongvec_minmax,
435 	},
436 	{
437 		.ctl_name	= KERN_SHMALL,
438 		.procname	= "shmall",
439 		.data		= &shm_ctlall,
440 		.maxlen		= sizeof (size_t),
441 		.mode		= 0644,
442 		.proc_handler	= &proc_doulongvec_minmax,
443 	},
444 	{
445 		.ctl_name	= KERN_SHMMNI,
446 		.procname	= "shmmni",
447 		.data		= &shm_ctlmni,
448 		.maxlen		= sizeof (int),
449 		.mode		= 0644,
450 		.proc_handler	= &proc_dointvec,
451 	},
452 	{
453 		.ctl_name	= KERN_MSGMAX,
454 		.procname	= "msgmax",
455 		.data		= &msg_ctlmax,
456 		.maxlen		= sizeof (int),
457 		.mode		= 0644,
458 		.proc_handler	= &proc_dointvec,
459 	},
460 	{
461 		.ctl_name	= KERN_MSGMNI,
462 		.procname	= "msgmni",
463 		.data		= &msg_ctlmni,
464 		.maxlen		= sizeof (int),
465 		.mode		= 0644,
466 		.proc_handler	= &proc_dointvec,
467 	},
468 	{
469 		.ctl_name	= KERN_MSGMNB,
470 		.procname	=  "msgmnb",
471 		.data		= &msg_ctlmnb,
472 		.maxlen		= sizeof (int),
473 		.mode		= 0644,
474 		.proc_handler	= &proc_dointvec,
475 	},
476 	{
477 		.ctl_name	= KERN_SEM,
478 		.procname	= "sem",
479 		.data		= &sem_ctls,
480 		.maxlen		= 4*sizeof (int),
481 		.mode		= 0644,
482 		.proc_handler	= &proc_dointvec,
483 	},
484 #endif
485 #ifdef CONFIG_MAGIC_SYSRQ
486 	{
487 		.ctl_name	= KERN_SYSRQ,
488 		.procname	= "sysrq",
489 		.data		= &sysrq_enabled,
490 		.maxlen		= sizeof (int),
491 		.mode		= 0644,
492 		.proc_handler	= &proc_dointvec,
493 	},
494 #endif
495 	{
496 		.ctl_name	= KERN_CADPID,
497 		.procname	= "cad_pid",
498 		.data		= &cad_pid,
499 		.maxlen		= sizeof (int),
500 		.mode		= 0600,
501 		.proc_handler	= &proc_dointvec,
502 	},
503 	{
504 		.ctl_name	= KERN_MAX_THREADS,
505 		.procname	= "threads-max",
506 		.data		= &max_threads,
507 		.maxlen		= sizeof(int),
508 		.mode		= 0644,
509 		.proc_handler	= &proc_dointvec,
510 	},
511 	{
512 		.ctl_name	= KERN_RANDOM,
513 		.procname	= "random",
514 		.mode		= 0555,
515 		.child		= random_table,
516 	},
517 #ifdef CONFIG_UNIX98_PTYS
518 	{
519 		.ctl_name	= KERN_PTY,
520 		.procname	= "pty",
521 		.mode		= 0555,
522 		.child		= pty_table,
523 	},
524 #endif
525 	{
526 		.ctl_name	= KERN_OVERFLOWUID,
527 		.procname	= "overflowuid",
528 		.data		= &overflowuid,
529 		.maxlen		= sizeof(int),
530 		.mode		= 0644,
531 		.proc_handler	= &proc_dointvec_minmax,
532 		.strategy	= &sysctl_intvec,
533 		.extra1		= &minolduid,
534 		.extra2		= &maxolduid,
535 	},
536 	{
537 		.ctl_name	= KERN_OVERFLOWGID,
538 		.procname	= "overflowgid",
539 		.data		= &overflowgid,
540 		.maxlen		= sizeof(int),
541 		.mode		= 0644,
542 		.proc_handler	= &proc_dointvec_minmax,
543 		.strategy	= &sysctl_intvec,
544 		.extra1		= &minolduid,
545 		.extra2		= &maxolduid,
546 	},
547 #ifdef CONFIG_ARCH_S390
548 #ifdef CONFIG_MATHEMU
549 	{
550 		.ctl_name	= KERN_IEEE_EMULATION_WARNINGS,
551 		.procname	= "ieee_emulation_warnings",
552 		.data		= &sysctl_ieee_emulation_warnings,
553 		.maxlen		= sizeof(int),
554 		.mode		= 0644,
555 		.proc_handler	= &proc_dointvec,
556 	},
557 #endif
558 #ifdef CONFIG_NO_IDLE_HZ
559 	{
560 		.ctl_name       = KERN_HZ_TIMER,
561 		.procname       = "hz_timer",
562 		.data           = &sysctl_hz_timer,
563 		.maxlen         = sizeof(int),
564 		.mode           = 0644,
565 		.proc_handler   = &proc_dointvec,
566 	},
567 #endif
568 	{
569 		.ctl_name	= KERN_S390_USER_DEBUG_LOGGING,
570 		.procname	= "userprocess_debug",
571 		.data		= &sysctl_userprocess_debug,
572 		.maxlen		= sizeof(int),
573 		.mode		= 0644,
574 		.proc_handler	= &proc_dointvec,
575 	},
576 #endif
577 	{
578 		.ctl_name	= KERN_PIDMAX,
579 		.procname	= "pid_max",
580 		.data		= &pid_max,
581 		.maxlen		= sizeof (int),
582 		.mode		= 0644,
583 		.proc_handler	= &proc_dointvec_minmax,
584 		.strategy	= sysctl_intvec,
585 		.extra1		= &pid_max_min,
586 		.extra2		= &pid_max_max,
587 	},
588 	{
589 		.ctl_name	= KERN_PANIC_ON_OOPS,
590 		.procname	= "panic_on_oops",
591 		.data		= &panic_on_oops,
592 		.maxlen		= sizeof(int),
593 		.mode		= 0644,
594 		.proc_handler	= &proc_dointvec,
595 	},
596 	{
597 		.ctl_name	= KERN_PRINTK_RATELIMIT,
598 		.procname	= "printk_ratelimit",
599 		.data		= &printk_ratelimit_jiffies,
600 		.maxlen		= sizeof(int),
601 		.mode		= 0644,
602 		.proc_handler	= &proc_dointvec_jiffies,
603 		.strategy	= &sysctl_jiffies,
604 	},
605 	{
606 		.ctl_name	= KERN_PRINTK_RATELIMIT_BURST,
607 		.procname	= "printk_ratelimit_burst",
608 		.data		= &printk_ratelimit_burst,
609 		.maxlen		= sizeof(int),
610 		.mode		= 0644,
611 		.proc_handler	= &proc_dointvec,
612 	},
613 	{
614 		.ctl_name	= KERN_NGROUPS_MAX,
615 		.procname	= "ngroups_max",
616 		.data		= &ngroups_max,
617 		.maxlen		= sizeof (int),
618 		.mode		= 0444,
619 		.proc_handler	= &proc_dointvec,
620 	},
621 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
622 	{
623 		.ctl_name       = KERN_UNKNOWN_NMI_PANIC,
624 		.procname       = "unknown_nmi_panic",
625 		.data           = &unknown_nmi_panic,
626 		.maxlen         = sizeof (int),
627 		.mode           = 0644,
628 		.proc_handler   = &proc_unknown_nmi_panic,
629 	},
630 #endif
631 #if defined(CONFIG_X86)
632 	{
633 		.ctl_name	= KERN_BOOTLOADER_TYPE,
634 		.procname	= "bootloader_type",
635 		.data		= &bootloader_type,
636 		.maxlen		= sizeof (int),
637 		.mode		= 0444,
638 		.proc_handler	= &proc_dointvec,
639 	},
640 #endif
641 	{
642 		.ctl_name	= KERN_RANDOMIZE,
643 		.procname	= "randomize_va_space",
644 		.data		= &randomize_va_space,
645 		.maxlen		= sizeof(int),
646 		.mode		= 0644,
647 		.proc_handler	= &proc_dointvec,
648 	},
649 #if defined(CONFIG_ARCH_S390)
650 	{
651 		.ctl_name	= KERN_SPIN_RETRY,
652 		.procname	= "spin_retry",
653 		.data		= &spin_retry,
654 		.maxlen		= sizeof (int),
655 		.mode		= 0644,
656 		.proc_handler	= &proc_dointvec,
657 	},
658 #endif
659 	{ .ctl_name = 0 }
660 };
661 
662 /* Constants for minimum and maximum testing in vm_table.
663    We use these as one-element integer vectors. */
664 static int zero;
665 static int one_hundred = 100;
666 
667 
668 static ctl_table vm_table[] = {
669 	{
670 		.ctl_name	= VM_OVERCOMMIT_MEMORY,
671 		.procname	= "overcommit_memory",
672 		.data		= &sysctl_overcommit_memory,
673 		.maxlen		= sizeof(sysctl_overcommit_memory),
674 		.mode		= 0644,
675 		.proc_handler	= &proc_dointvec,
676 	},
677 	{
678 		.ctl_name	= VM_OVERCOMMIT_RATIO,
679 		.procname	= "overcommit_ratio",
680 		.data		= &sysctl_overcommit_ratio,
681 		.maxlen		= sizeof(sysctl_overcommit_ratio),
682 		.mode		= 0644,
683 		.proc_handler	= &proc_dointvec,
684 	},
685 	{
686 		.ctl_name	= VM_PAGE_CLUSTER,
687 		.procname	= "page-cluster",
688 		.data		= &page_cluster,
689 		.maxlen		= sizeof(int),
690 		.mode		= 0644,
691 		.proc_handler	= &proc_dointvec,
692 	},
693 	{
694 		.ctl_name	= VM_DIRTY_BACKGROUND,
695 		.procname	= "dirty_background_ratio",
696 		.data		= &dirty_background_ratio,
697 		.maxlen		= sizeof(dirty_background_ratio),
698 		.mode		= 0644,
699 		.proc_handler	= &proc_dointvec_minmax,
700 		.strategy	= &sysctl_intvec,
701 		.extra1		= &zero,
702 		.extra2		= &one_hundred,
703 	},
704 	{
705 		.ctl_name	= VM_DIRTY_RATIO,
706 		.procname	= "dirty_ratio",
707 		.data		= &vm_dirty_ratio,
708 		.maxlen		= sizeof(vm_dirty_ratio),
709 		.mode		= 0644,
710 		.proc_handler	= &proc_dointvec_minmax,
711 		.strategy	= &sysctl_intvec,
712 		.extra1		= &zero,
713 		.extra2		= &one_hundred,
714 	},
715 	{
716 		.ctl_name	= VM_DIRTY_WB_CS,
717 		.procname	= "dirty_writeback_centisecs",
718 		.data		= &dirty_writeback_centisecs,
719 		.maxlen		= sizeof(dirty_writeback_centisecs),
720 		.mode		= 0644,
721 		.proc_handler	= &dirty_writeback_centisecs_handler,
722 	},
723 	{
724 		.ctl_name	= VM_DIRTY_EXPIRE_CS,
725 		.procname	= "dirty_expire_centisecs",
726 		.data		= &dirty_expire_centisecs,
727 		.maxlen		= sizeof(dirty_expire_centisecs),
728 		.mode		= 0644,
729 		.proc_handler	= &proc_dointvec,
730 	},
731 	{
732 		.ctl_name	= VM_NR_PDFLUSH_THREADS,
733 		.procname	= "nr_pdflush_threads",
734 		.data		= &nr_pdflush_threads,
735 		.maxlen		= sizeof nr_pdflush_threads,
736 		.mode		= 0444 /* read-only*/,
737 		.proc_handler	= &proc_dointvec,
738 	},
739 	{
740 		.ctl_name	= VM_SWAPPINESS,
741 		.procname	= "swappiness",
742 		.data		= &vm_swappiness,
743 		.maxlen		= sizeof(vm_swappiness),
744 		.mode		= 0644,
745 		.proc_handler	= &proc_dointvec_minmax,
746 		.strategy	= &sysctl_intvec,
747 		.extra1		= &zero,
748 		.extra2		= &one_hundred,
749 	},
750 #ifdef CONFIG_HUGETLB_PAGE
751 	 {
752 		.ctl_name	= VM_HUGETLB_PAGES,
753 		.procname	= "nr_hugepages",
754 		.data		= &max_huge_pages,
755 		.maxlen		= sizeof(unsigned long),
756 		.mode		= 0644,
757 		.proc_handler	= &hugetlb_sysctl_handler,
758 		.extra1		= (void *)&hugetlb_zero,
759 		.extra2		= (void *)&hugetlb_infinity,
760 	 },
761 	 {
762 		.ctl_name	= VM_HUGETLB_GROUP,
763 		.procname	= "hugetlb_shm_group",
764 		.data		= &sysctl_hugetlb_shm_group,
765 		.maxlen		= sizeof(gid_t),
766 		.mode		= 0644,
767 		.proc_handler	= &proc_dointvec,
768 	 },
769 #endif
770 	{
771 		.ctl_name	= VM_LOWMEM_RESERVE_RATIO,
772 		.procname	= "lowmem_reserve_ratio",
773 		.data		= &sysctl_lowmem_reserve_ratio,
774 		.maxlen		= sizeof(sysctl_lowmem_reserve_ratio),
775 		.mode		= 0644,
776 		.proc_handler	= &lowmem_reserve_ratio_sysctl_handler,
777 		.strategy	= &sysctl_intvec,
778 	},
779 	{
780 		.ctl_name	= VM_MIN_FREE_KBYTES,
781 		.procname	= "min_free_kbytes",
782 		.data		= &min_free_kbytes,
783 		.maxlen		= sizeof(min_free_kbytes),
784 		.mode		= 0644,
785 		.proc_handler	= &min_free_kbytes_sysctl_handler,
786 		.strategy	= &sysctl_intvec,
787 		.extra1		= &zero,
788 	},
789 #ifdef CONFIG_MMU
790 	{
791 		.ctl_name	= VM_MAX_MAP_COUNT,
792 		.procname	= "max_map_count",
793 		.data		= &sysctl_max_map_count,
794 		.maxlen		= sizeof(sysctl_max_map_count),
795 		.mode		= 0644,
796 		.proc_handler	= &proc_dointvec
797 	},
798 #endif
799 	{
800 		.ctl_name	= VM_LAPTOP_MODE,
801 		.procname	= "laptop_mode",
802 		.data		= &laptop_mode,
803 		.maxlen		= sizeof(laptop_mode),
804 		.mode		= 0644,
805 		.proc_handler	= &proc_dointvec,
806 		.strategy	= &sysctl_intvec,
807 		.extra1		= &zero,
808 	},
809 	{
810 		.ctl_name	= VM_BLOCK_DUMP,
811 		.procname	= "block_dump",
812 		.data		= &block_dump,
813 		.maxlen		= sizeof(block_dump),
814 		.mode		= 0644,
815 		.proc_handler	= &proc_dointvec,
816 		.strategy	= &sysctl_intvec,
817 		.extra1		= &zero,
818 	},
819 	{
820 		.ctl_name	= VM_VFS_CACHE_PRESSURE,
821 		.procname	= "vfs_cache_pressure",
822 		.data		= &sysctl_vfs_cache_pressure,
823 		.maxlen		= sizeof(sysctl_vfs_cache_pressure),
824 		.mode		= 0644,
825 		.proc_handler	= &proc_dointvec,
826 		.strategy	= &sysctl_intvec,
827 		.extra1		= &zero,
828 	},
829 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
830 	{
831 		.ctl_name	= VM_LEGACY_VA_LAYOUT,
832 		.procname	= "legacy_va_layout",
833 		.data		= &sysctl_legacy_va_layout,
834 		.maxlen		= sizeof(sysctl_legacy_va_layout),
835 		.mode		= 0644,
836 		.proc_handler	= &proc_dointvec,
837 		.strategy	= &sysctl_intvec,
838 		.extra1		= &zero,
839 	},
840 #endif
841 #ifdef CONFIG_SWAP
842 	{
843 		.ctl_name	= VM_SWAP_TOKEN_TIMEOUT,
844 		.procname	= "swap_token_timeout",
845 		.data		= &swap_token_default_timeout,
846 		.maxlen		= sizeof(swap_token_default_timeout),
847 		.mode		= 0644,
848 		.proc_handler	= &proc_dointvec_jiffies,
849 		.strategy	= &sysctl_jiffies,
850 	},
851 #endif
852 	{ .ctl_name = 0 }
853 };
854 
855 static ctl_table proc_table[] = {
856 	{ .ctl_name = 0 }
857 };
858 
859 static ctl_table fs_table[] = {
860 	{
861 		.ctl_name	= FS_NRINODE,
862 		.procname	= "inode-nr",
863 		.data		= &inodes_stat,
864 		.maxlen		= 2*sizeof(int),
865 		.mode		= 0444,
866 		.proc_handler	= &proc_dointvec,
867 	},
868 	{
869 		.ctl_name	= FS_STATINODE,
870 		.procname	= "inode-state",
871 		.data		= &inodes_stat,
872 		.maxlen		= 7*sizeof(int),
873 		.mode		= 0444,
874 		.proc_handler	= &proc_dointvec,
875 	},
876 	{
877 		.ctl_name	= FS_NRFILE,
878 		.procname	= "file-nr",
879 		.data		= &files_stat,
880 		.maxlen		= 3*sizeof(int),
881 		.mode		= 0444,
882 		.proc_handler	= &proc_dointvec,
883 	},
884 	{
885 		.ctl_name	= FS_MAXFILE,
886 		.procname	= "file-max",
887 		.data		= &files_stat.max_files,
888 		.maxlen		= sizeof(int),
889 		.mode		= 0644,
890 		.proc_handler	= &proc_dointvec,
891 	},
892 	{
893 		.ctl_name	= FS_DENTRY,
894 		.procname	= "dentry-state",
895 		.data		= &dentry_stat,
896 		.maxlen		= 6*sizeof(int),
897 		.mode		= 0444,
898 		.proc_handler	= &proc_dointvec,
899 	},
900 	{
901 		.ctl_name	= FS_OVERFLOWUID,
902 		.procname	= "overflowuid",
903 		.data		= &fs_overflowuid,
904 		.maxlen		= sizeof(int),
905 		.mode		= 0644,
906 		.proc_handler	= &proc_dointvec_minmax,
907 		.strategy	= &sysctl_intvec,
908 		.extra1		= &minolduid,
909 		.extra2		= &maxolduid,
910 	},
911 	{
912 		.ctl_name	= FS_OVERFLOWGID,
913 		.procname	= "overflowgid",
914 		.data		= &fs_overflowgid,
915 		.maxlen		= sizeof(int),
916 		.mode		= 0644,
917 		.proc_handler	= &proc_dointvec_minmax,
918 		.strategy	= &sysctl_intvec,
919 		.extra1		= &minolduid,
920 		.extra2		= &maxolduid,
921 	},
922 	{
923 		.ctl_name	= FS_LEASES,
924 		.procname	= "leases-enable",
925 		.data		= &leases_enable,
926 		.maxlen		= sizeof(int),
927 		.mode		= 0644,
928 		.proc_handler	= &proc_dointvec,
929 	},
930 #ifdef CONFIG_DNOTIFY
931 	{
932 		.ctl_name	= FS_DIR_NOTIFY,
933 		.procname	= "dir-notify-enable",
934 		.data		= &dir_notify_enable,
935 		.maxlen		= sizeof(int),
936 		.mode		= 0644,
937 		.proc_handler	= &proc_dointvec,
938 	},
939 #endif
940 #ifdef CONFIG_MMU
941 	{
942 		.ctl_name	= FS_LEASE_TIME,
943 		.procname	= "lease-break-time",
944 		.data		= &lease_break_time,
945 		.maxlen		= sizeof(int),
946 		.mode		= 0644,
947 		.proc_handler	= &proc_dointvec,
948 	},
949 	{
950 		.ctl_name	= FS_AIO_NR,
951 		.procname	= "aio-nr",
952 		.data		= &aio_nr,
953 		.maxlen		= sizeof(aio_nr),
954 		.mode		= 0444,
955 		.proc_handler	= &proc_dointvec,
956 	},
957 	{
958 		.ctl_name	= FS_AIO_MAX_NR,
959 		.procname	= "aio-max-nr",
960 		.data		= &aio_max_nr,
961 		.maxlen		= sizeof(aio_max_nr),
962 		.mode		= 0644,
963 		.proc_handler	= &proc_dointvec,
964 	},
965 #ifdef CONFIG_INOTIFY
966 	{
967 		.ctl_name	= FS_INOTIFY,
968 		.procname	= "inotify",
969 		.mode		= 0555,
970 		.child		= inotify_table,
971 	},
972 #endif
973 #endif
974 	{
975 		.ctl_name	= KERN_SETUID_DUMPABLE,
976 		.procname	= "suid_dumpable",
977 		.data		= &suid_dumpable,
978 		.maxlen		= sizeof(int),
979 		.mode		= 0644,
980 		.proc_handler	= &proc_dointvec,
981 	},
982 	{ .ctl_name = 0 }
983 };
984 
985 static ctl_table debug_table[] = {
986 	{ .ctl_name = 0 }
987 };
988 
989 static ctl_table dev_table[] = {
990 	{ .ctl_name = 0 }
991 };
992 
993 extern void init_irq_proc (void);
994 
995 void __init sysctl_init(void)
996 {
997 #ifdef CONFIG_PROC_FS
998 	register_proc_table(root_table, proc_sys_root);
999 	init_irq_proc();
1000 #endif
1001 }
1002 
1003 int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp,
1004 	       void __user *newval, size_t newlen)
1005 {
1006 	struct list_head *tmp;
1007 
1008 	if (nlen <= 0 || nlen >= CTL_MAXNAME)
1009 		return -ENOTDIR;
1010 	if (oldval) {
1011 		int old_len;
1012 		if (!oldlenp || get_user(old_len, oldlenp))
1013 			return -EFAULT;
1014 	}
1015 	tmp = &root_table_header.ctl_entry;
1016 	do {
1017 		struct ctl_table_header *head =
1018 			list_entry(tmp, struct ctl_table_header, ctl_entry);
1019 		void *context = NULL;
1020 		int error = parse_table(name, nlen, oldval, oldlenp,
1021 					newval, newlen, head->ctl_table,
1022 					&context);
1023 		kfree(context);
1024 		if (error != -ENOTDIR)
1025 			return error;
1026 		tmp = tmp->next;
1027 	} while (tmp != &root_table_header.ctl_entry);
1028 	return -ENOTDIR;
1029 }
1030 
1031 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
1032 {
1033 	struct __sysctl_args tmp;
1034 	int error;
1035 
1036 	if (copy_from_user(&tmp, args, sizeof(tmp)))
1037 		return -EFAULT;
1038 
1039 	lock_kernel();
1040 	error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp,
1041 			  tmp.newval, tmp.newlen);
1042 	unlock_kernel();
1043 	return error;
1044 }
1045 
1046 /*
1047  * ctl_perm does NOT grant the superuser all rights automatically, because
1048  * some sysctl variables are readonly even to root.
1049  */
1050 
1051 static int test_perm(int mode, int op)
1052 {
1053 	if (!current->euid)
1054 		mode >>= 6;
1055 	else if (in_egroup_p(0))
1056 		mode >>= 3;
1057 	if ((mode & op & 0007) == op)
1058 		return 0;
1059 	return -EACCES;
1060 }
1061 
1062 static inline int ctl_perm(ctl_table *table, int op)
1063 {
1064 	int error;
1065 	error = security_sysctl(table, op);
1066 	if (error)
1067 		return error;
1068 	return test_perm(table->mode, op);
1069 }
1070 
1071 static int parse_table(int __user *name, int nlen,
1072 		       void __user *oldval, size_t __user *oldlenp,
1073 		       void __user *newval, size_t newlen,
1074 		       ctl_table *table, void **context)
1075 {
1076 	int n;
1077 repeat:
1078 	if (!nlen)
1079 		return -ENOTDIR;
1080 	if (get_user(n, name))
1081 		return -EFAULT;
1082 	for ( ; table->ctl_name; table++) {
1083 		if (n == table->ctl_name || table->ctl_name == CTL_ANY) {
1084 			int error;
1085 			if (table->child) {
1086 				if (ctl_perm(table, 001))
1087 					return -EPERM;
1088 				if (table->strategy) {
1089 					error = table->strategy(
1090 						table, name, nlen,
1091 						oldval, oldlenp,
1092 						newval, newlen, context);
1093 					if (error)
1094 						return error;
1095 				}
1096 				name++;
1097 				nlen--;
1098 				table = table->child;
1099 				goto repeat;
1100 			}
1101 			error = do_sysctl_strategy(table, name, nlen,
1102 						   oldval, oldlenp,
1103 						   newval, newlen, context);
1104 			return error;
1105 		}
1106 	}
1107 	return -ENOTDIR;
1108 }
1109 
1110 /* Perform the actual read/write of a sysctl table entry. */
1111 int do_sysctl_strategy (ctl_table *table,
1112 			int __user *name, int nlen,
1113 			void __user *oldval, size_t __user *oldlenp,
1114 			void __user *newval, size_t newlen, void **context)
1115 {
1116 	int op = 0, rc;
1117 	size_t len;
1118 
1119 	if (oldval)
1120 		op |= 004;
1121 	if (newval)
1122 		op |= 002;
1123 	if (ctl_perm(table, op))
1124 		return -EPERM;
1125 
1126 	if (table->strategy) {
1127 		rc = table->strategy(table, name, nlen, oldval, oldlenp,
1128 				     newval, newlen, context);
1129 		if (rc < 0)
1130 			return rc;
1131 		if (rc > 0)
1132 			return 0;
1133 	}
1134 
1135 	/* If there is no strategy routine, or if the strategy returns
1136 	 * zero, proceed with automatic r/w */
1137 	if (table->data && table->maxlen) {
1138 		if (oldval && oldlenp) {
1139 			if (get_user(len, oldlenp))
1140 				return -EFAULT;
1141 			if (len) {
1142 				if (len > table->maxlen)
1143 					len = table->maxlen;
1144 				if(copy_to_user(oldval, table->data, len))
1145 					return -EFAULT;
1146 				if(put_user(len, oldlenp))
1147 					return -EFAULT;
1148 			}
1149 		}
1150 		if (newval && newlen) {
1151 			len = newlen;
1152 			if (len > table->maxlen)
1153 				len = table->maxlen;
1154 			if(copy_from_user(table->data, newval, len))
1155 				return -EFAULT;
1156 		}
1157 	}
1158 	return 0;
1159 }
1160 
1161 /**
1162  * register_sysctl_table - register a sysctl hierarchy
1163  * @table: the top-level table structure
1164  * @insert_at_head: whether the entry should be inserted in front or at the end
1165  *
1166  * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1167  * array. An entry with a ctl_name of 0 terminates the table.
1168  *
1169  * The members of the &ctl_table structure are used as follows:
1170  *
1171  * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1172  *            must be unique within that level of sysctl
1173  *
1174  * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1175  *            enter a sysctl file
1176  *
1177  * data - a pointer to data for use by proc_handler
1178  *
1179  * maxlen - the maximum size in bytes of the data
1180  *
1181  * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1182  *
1183  * child - a pointer to the child sysctl table if this entry is a directory, or
1184  *         %NULL.
1185  *
1186  * proc_handler - the text handler routine (described below)
1187  *
1188  * strategy - the strategy routine (described below)
1189  *
1190  * de - for internal use by the sysctl routines
1191  *
1192  * extra1, extra2 - extra pointers usable by the proc handler routines
1193  *
1194  * Leaf nodes in the sysctl tree will be represented by a single file
1195  * under /proc; non-leaf nodes will be represented by directories.
1196  *
1197  * sysctl(2) can automatically manage read and write requests through
1198  * the sysctl table.  The data and maxlen fields of the ctl_table
1199  * struct enable minimal validation of the values being written to be
1200  * performed, and the mode field allows minimal authentication.
1201  *
1202  * More sophisticated management can be enabled by the provision of a
1203  * strategy routine with the table entry.  This will be called before
1204  * any automatic read or write of the data is performed.
1205  *
1206  * The strategy routine may return
1207  *
1208  * < 0 - Error occurred (error is passed to user process)
1209  *
1210  * 0   - OK - proceed with automatic read or write.
1211  *
1212  * > 0 - OK - read or write has been done by the strategy routine, so
1213  *       return immediately.
1214  *
1215  * There must be a proc_handler routine for any terminal nodes
1216  * mirrored under /proc/sys (non-terminals are handled by a built-in
1217  * directory handler).  Several default handlers are available to
1218  * cover common cases -
1219  *
1220  * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1221  * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1222  * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1223  *
1224  * It is the handler's job to read the input buffer from user memory
1225  * and process it. The handler should return 0 on success.
1226  *
1227  * This routine returns %NULL on a failure to register, and a pointer
1228  * to the table header on success.
1229  */
1230 struct ctl_table_header *register_sysctl_table(ctl_table * table,
1231 					       int insert_at_head)
1232 {
1233 	struct ctl_table_header *tmp;
1234 	tmp = kmalloc(sizeof(struct ctl_table_header), GFP_KERNEL);
1235 	if (!tmp)
1236 		return NULL;
1237 	tmp->ctl_table = table;
1238 	INIT_LIST_HEAD(&tmp->ctl_entry);
1239 	if (insert_at_head)
1240 		list_add(&tmp->ctl_entry, &root_table_header.ctl_entry);
1241 	else
1242 		list_add_tail(&tmp->ctl_entry, &root_table_header.ctl_entry);
1243 #ifdef CONFIG_PROC_FS
1244 	register_proc_table(table, proc_sys_root);
1245 #endif
1246 	return tmp;
1247 }
1248 
1249 /**
1250  * unregister_sysctl_table - unregister a sysctl table hierarchy
1251  * @header: the header returned from register_sysctl_table
1252  *
1253  * Unregisters the sysctl table and all children. proc entries may not
1254  * actually be removed until they are no longer used by anyone.
1255  */
1256 void unregister_sysctl_table(struct ctl_table_header * header)
1257 {
1258 	list_del(&header->ctl_entry);
1259 #ifdef CONFIG_PROC_FS
1260 	unregister_proc_table(header->ctl_table, proc_sys_root);
1261 #endif
1262 	kfree(header);
1263 }
1264 
1265 /*
1266  * /proc/sys support
1267  */
1268 
1269 #ifdef CONFIG_PROC_FS
1270 
1271 /* Scan the sysctl entries in table and add them all into /proc */
1272 static void register_proc_table(ctl_table * table, struct proc_dir_entry *root)
1273 {
1274 	struct proc_dir_entry *de;
1275 	int len;
1276 	mode_t mode;
1277 
1278 	for (; table->ctl_name; table++) {
1279 		/* Can't do anything without a proc name. */
1280 		if (!table->procname)
1281 			continue;
1282 		/* Maybe we can't do anything with it... */
1283 		if (!table->proc_handler && !table->child) {
1284 			printk(KERN_WARNING "SYSCTL: Can't register %s\n",
1285 				table->procname);
1286 			continue;
1287 		}
1288 
1289 		len = strlen(table->procname);
1290 		mode = table->mode;
1291 
1292 		de = NULL;
1293 		if (table->proc_handler)
1294 			mode |= S_IFREG;
1295 		else {
1296 			mode |= S_IFDIR;
1297 			for (de = root->subdir; de; de = de->next) {
1298 				if (proc_match(len, table->procname, de))
1299 					break;
1300 			}
1301 			/* If the subdir exists already, de is non-NULL */
1302 		}
1303 
1304 		if (!de) {
1305 			de = create_proc_entry(table->procname, mode, root);
1306 			if (!de)
1307 				continue;
1308 			de->data = (void *) table;
1309 			if (table->proc_handler)
1310 				de->proc_fops = &proc_sys_file_operations;
1311 		}
1312 		table->de = de;
1313 		if (de->mode & S_IFDIR)
1314 			register_proc_table(table->child, de);
1315 	}
1316 }
1317 
1318 /*
1319  * Unregister a /proc sysctl table and any subdirectories.
1320  */
1321 static void unregister_proc_table(ctl_table * table, struct proc_dir_entry *root)
1322 {
1323 	struct proc_dir_entry *de;
1324 	for (; table->ctl_name; table++) {
1325 		if (!(de = table->de))
1326 			continue;
1327 		if (de->mode & S_IFDIR) {
1328 			if (!table->child) {
1329 				printk (KERN_ALERT "Help - malformed sysctl tree on free\n");
1330 				continue;
1331 			}
1332 			unregister_proc_table(table->child, de);
1333 
1334 			/* Don't unregister directories which still have entries.. */
1335 			if (de->subdir)
1336 				continue;
1337 		}
1338 
1339 		/* Don't unregister proc entries that are still being used.. */
1340 		if (atomic_read(&de->count))
1341 			continue;
1342 
1343 		table->de = NULL;
1344 		remove_proc_entry(table->procname, root);
1345 	}
1346 }
1347 
1348 static ssize_t do_rw_proc(int write, struct file * file, char __user * buf,
1349 			  size_t count, loff_t *ppos)
1350 {
1351 	int op;
1352 	struct proc_dir_entry *de;
1353 	struct ctl_table *table;
1354 	size_t res;
1355 	ssize_t error;
1356 
1357 	de = PDE(file->f_dentry->d_inode);
1358 	if (!de || !de->data)
1359 		return -ENOTDIR;
1360 	table = (struct ctl_table *) de->data;
1361 	if (!table || !table->proc_handler)
1362 		return -ENOTDIR;
1363 	op = (write ? 002 : 004);
1364 	if (ctl_perm(table, op))
1365 		return -EPERM;
1366 
1367 	res = count;
1368 
1369 	error = (*table->proc_handler) (table, write, file, buf, &res, ppos);
1370 	if (error)
1371 		return error;
1372 	return res;
1373 }
1374 
1375 static int proc_opensys(struct inode *inode, struct file *file)
1376 {
1377 	if (file->f_mode & FMODE_WRITE) {
1378 		/*
1379 		 * sysctl entries that are not writable,
1380 		 * are _NOT_ writable, capabilities or not.
1381 		 */
1382 		if (!(inode->i_mode & S_IWUSR))
1383 			return -EPERM;
1384 	}
1385 
1386 	return 0;
1387 }
1388 
1389 static ssize_t proc_readsys(struct file * file, char __user * buf,
1390 			    size_t count, loff_t *ppos)
1391 {
1392 	return do_rw_proc(0, file, buf, count, ppos);
1393 }
1394 
1395 static ssize_t proc_writesys(struct file * file, const char __user * buf,
1396 			     size_t count, loff_t *ppos)
1397 {
1398 	return do_rw_proc(1, file, (char __user *) buf, count, ppos);
1399 }
1400 
1401 /**
1402  * proc_dostring - read a string sysctl
1403  * @table: the sysctl table
1404  * @write: %TRUE if this is a write to the sysctl file
1405  * @filp: the file structure
1406  * @buffer: the user buffer
1407  * @lenp: the size of the user buffer
1408  * @ppos: file position
1409  *
1410  * Reads/writes a string from/to the user buffer. If the kernel
1411  * buffer provided is not large enough to hold the string, the
1412  * string is truncated. The copied string is %NULL-terminated.
1413  * If the string is being read by the user process, it is copied
1414  * and a newline '\n' is added. It is truncated if the buffer is
1415  * not large enough.
1416  *
1417  * Returns 0 on success.
1418  */
1419 int proc_dostring(ctl_table *table, int write, struct file *filp,
1420 		  void __user *buffer, size_t *lenp, loff_t *ppos)
1421 {
1422 	size_t len;
1423 	char __user *p;
1424 	char c;
1425 
1426 	if (!table->data || !table->maxlen || !*lenp ||
1427 	    (*ppos && !write)) {
1428 		*lenp = 0;
1429 		return 0;
1430 	}
1431 
1432 	if (write) {
1433 		len = 0;
1434 		p = buffer;
1435 		while (len < *lenp) {
1436 			if (get_user(c, p++))
1437 				return -EFAULT;
1438 			if (c == 0 || c == '\n')
1439 				break;
1440 			len++;
1441 		}
1442 		if (len >= table->maxlen)
1443 			len = table->maxlen-1;
1444 		if(copy_from_user(table->data, buffer, len))
1445 			return -EFAULT;
1446 		((char *) table->data)[len] = 0;
1447 		*ppos += *lenp;
1448 	} else {
1449 		len = strlen(table->data);
1450 		if (len > table->maxlen)
1451 			len = table->maxlen;
1452 		if (len > *lenp)
1453 			len = *lenp;
1454 		if (len)
1455 			if(copy_to_user(buffer, table->data, len))
1456 				return -EFAULT;
1457 		if (len < *lenp) {
1458 			if(put_user('\n', ((char __user *) buffer) + len))
1459 				return -EFAULT;
1460 			len++;
1461 		}
1462 		*lenp = len;
1463 		*ppos += len;
1464 	}
1465 	return 0;
1466 }
1467 
1468 /*
1469  *	Special case of dostring for the UTS structure. This has locks
1470  *	to observe. Should this be in kernel/sys.c ????
1471  */
1472 
1473 static int proc_doutsstring(ctl_table *table, int write, struct file *filp,
1474 		  void __user *buffer, size_t *lenp, loff_t *ppos)
1475 {
1476 	int r;
1477 
1478 	if (!write) {
1479 		down_read(&uts_sem);
1480 		r=proc_dostring(table,0,filp,buffer,lenp, ppos);
1481 		up_read(&uts_sem);
1482 	} else {
1483 		down_write(&uts_sem);
1484 		r=proc_dostring(table,1,filp,buffer,lenp, ppos);
1485 		up_write(&uts_sem);
1486 	}
1487 	return r;
1488 }
1489 
1490 static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp,
1491 				 int *valp,
1492 				 int write, void *data)
1493 {
1494 	if (write) {
1495 		*valp = *negp ? -*lvalp : *lvalp;
1496 	} else {
1497 		int val = *valp;
1498 		if (val < 0) {
1499 			*negp = -1;
1500 			*lvalp = (unsigned long)-val;
1501 		} else {
1502 			*negp = 0;
1503 			*lvalp = (unsigned long)val;
1504 		}
1505 	}
1506 	return 0;
1507 }
1508 
1509 static int do_proc_dointvec(ctl_table *table, int write, struct file *filp,
1510 		  void __user *buffer, size_t *lenp, loff_t *ppos,
1511 		  int (*conv)(int *negp, unsigned long *lvalp, int *valp,
1512 			      int write, void *data),
1513 		  void *data)
1514 {
1515 #define TMPBUFLEN 21
1516 	int *i, vleft, first=1, neg, val;
1517 	unsigned long lval;
1518 	size_t left, len;
1519 
1520 	char buf[TMPBUFLEN], *p;
1521 	char __user *s = buffer;
1522 
1523 	if (!table->data || !table->maxlen || !*lenp ||
1524 	    (*ppos && !write)) {
1525 		*lenp = 0;
1526 		return 0;
1527 	}
1528 
1529 	i = (int *) table->data;
1530 	vleft = table->maxlen / sizeof(*i);
1531 	left = *lenp;
1532 
1533 	if (!conv)
1534 		conv = do_proc_dointvec_conv;
1535 
1536 	for (; left && vleft--; i++, first=0) {
1537 		if (write) {
1538 			while (left) {
1539 				char c;
1540 				if (get_user(c, s))
1541 					return -EFAULT;
1542 				if (!isspace(c))
1543 					break;
1544 				left--;
1545 				s++;
1546 			}
1547 			if (!left)
1548 				break;
1549 			neg = 0;
1550 			len = left;
1551 			if (len > sizeof(buf) - 1)
1552 				len = sizeof(buf) - 1;
1553 			if (copy_from_user(buf, s, len))
1554 				return -EFAULT;
1555 			buf[len] = 0;
1556 			p = buf;
1557 			if (*p == '-' && left > 1) {
1558 				neg = 1;
1559 				left--, p++;
1560 			}
1561 			if (*p < '0' || *p > '9')
1562 				break;
1563 
1564 			lval = simple_strtoul(p, &p, 0);
1565 
1566 			len = p-buf;
1567 			if ((len < left) && *p && !isspace(*p))
1568 				break;
1569 			if (neg)
1570 				val = -val;
1571 			s += len;
1572 			left -= len;
1573 
1574 			if (conv(&neg, &lval, i, 1, data))
1575 				break;
1576 		} else {
1577 			p = buf;
1578 			if (!first)
1579 				*p++ = '\t';
1580 
1581 			if (conv(&neg, &lval, i, 0, data))
1582 				break;
1583 
1584 			sprintf(p, "%s%lu", neg ? "-" : "", lval);
1585 			len = strlen(buf);
1586 			if (len > left)
1587 				len = left;
1588 			if(copy_to_user(s, buf, len))
1589 				return -EFAULT;
1590 			left -= len;
1591 			s += len;
1592 		}
1593 	}
1594 
1595 	if (!write && !first && left) {
1596 		if(put_user('\n', s))
1597 			return -EFAULT;
1598 		left--, s++;
1599 	}
1600 	if (write) {
1601 		while (left) {
1602 			char c;
1603 			if (get_user(c, s++))
1604 				return -EFAULT;
1605 			if (!isspace(c))
1606 				break;
1607 			left--;
1608 		}
1609 	}
1610 	if (write && first)
1611 		return -EINVAL;
1612 	*lenp -= left;
1613 	*ppos += *lenp;
1614 	return 0;
1615 #undef TMPBUFLEN
1616 }
1617 
1618 /**
1619  * proc_dointvec - read a vector of integers
1620  * @table: the sysctl table
1621  * @write: %TRUE if this is a write to the sysctl file
1622  * @filp: the file structure
1623  * @buffer: the user buffer
1624  * @lenp: the size of the user buffer
1625  * @ppos: file position
1626  *
1627  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1628  * values from/to the user buffer, treated as an ASCII string.
1629  *
1630  * Returns 0 on success.
1631  */
1632 int proc_dointvec(ctl_table *table, int write, struct file *filp,
1633 		     void __user *buffer, size_t *lenp, loff_t *ppos)
1634 {
1635     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
1636 		    	    NULL,NULL);
1637 }
1638 
1639 #define OP_SET	0
1640 #define OP_AND	1
1641 #define OP_OR	2
1642 #define OP_MAX	3
1643 #define OP_MIN	4
1644 
1645 static int do_proc_dointvec_bset_conv(int *negp, unsigned long *lvalp,
1646 				      int *valp,
1647 				      int write, void *data)
1648 {
1649 	int op = *(int *)data;
1650 	if (write) {
1651 		int val = *negp ? -*lvalp : *lvalp;
1652 		switch(op) {
1653 		case OP_SET:	*valp = val; break;
1654 		case OP_AND:	*valp &= val; break;
1655 		case OP_OR:	*valp |= val; break;
1656 		case OP_MAX:	if(*valp < val)
1657 					*valp = val;
1658 				break;
1659 		case OP_MIN:	if(*valp > val)
1660 				*valp = val;
1661 				break;
1662 		}
1663 	} else {
1664 		int val = *valp;
1665 		if (val < 0) {
1666 			*negp = -1;
1667 			*lvalp = (unsigned long)-val;
1668 		} else {
1669 			*negp = 0;
1670 			*lvalp = (unsigned long)val;
1671 		}
1672 	}
1673 	return 0;
1674 }
1675 
1676 /*
1677  *	init may raise the set.
1678  */
1679 
1680 int proc_dointvec_bset(ctl_table *table, int write, struct file *filp,
1681 			void __user *buffer, size_t *lenp, loff_t *ppos)
1682 {
1683 	int op;
1684 
1685 	if (!capable(CAP_SYS_MODULE)) {
1686 		return -EPERM;
1687 	}
1688 
1689 	op = (current->pid == 1) ? OP_SET : OP_AND;
1690 	return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
1691 				do_proc_dointvec_bset_conv,&op);
1692 }
1693 
1694 struct do_proc_dointvec_minmax_conv_param {
1695 	int *min;
1696 	int *max;
1697 };
1698 
1699 static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp,
1700 					int *valp,
1701 					int write, void *data)
1702 {
1703 	struct do_proc_dointvec_minmax_conv_param *param = data;
1704 	if (write) {
1705 		int val = *negp ? -*lvalp : *lvalp;
1706 		if ((param->min && *param->min > val) ||
1707 		    (param->max && *param->max < val))
1708 			return -EINVAL;
1709 		*valp = val;
1710 	} else {
1711 		int val = *valp;
1712 		if (val < 0) {
1713 			*negp = -1;
1714 			*lvalp = (unsigned long)-val;
1715 		} else {
1716 			*negp = 0;
1717 			*lvalp = (unsigned long)val;
1718 		}
1719 	}
1720 	return 0;
1721 }
1722 
1723 /**
1724  * proc_dointvec_minmax - read a vector of integers with min/max values
1725  * @table: the sysctl table
1726  * @write: %TRUE if this is a write to the sysctl file
1727  * @filp: the file structure
1728  * @buffer: the user buffer
1729  * @lenp: the size of the user buffer
1730  * @ppos: file position
1731  *
1732  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1733  * values from/to the user buffer, treated as an ASCII string.
1734  *
1735  * This routine will ensure the values are within the range specified by
1736  * table->extra1 (min) and table->extra2 (max).
1737  *
1738  * Returns 0 on success.
1739  */
1740 int proc_dointvec_minmax(ctl_table *table, int write, struct file *filp,
1741 		  void __user *buffer, size_t *lenp, loff_t *ppos)
1742 {
1743 	struct do_proc_dointvec_minmax_conv_param param = {
1744 		.min = (int *) table->extra1,
1745 		.max = (int *) table->extra2,
1746 	};
1747 	return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
1748 				do_proc_dointvec_minmax_conv, &param);
1749 }
1750 
1751 static int do_proc_doulongvec_minmax(ctl_table *table, int write,
1752 				     struct file *filp,
1753 				     void __user *buffer,
1754 				     size_t *lenp, loff_t *ppos,
1755 				     unsigned long convmul,
1756 				     unsigned long convdiv)
1757 {
1758 #define TMPBUFLEN 21
1759 	unsigned long *i, *min, *max, val;
1760 	int vleft, first=1, neg;
1761 	size_t len, left;
1762 	char buf[TMPBUFLEN], *p;
1763 	char __user *s = buffer;
1764 
1765 	if (!table->data || !table->maxlen || !*lenp ||
1766 	    (*ppos && !write)) {
1767 		*lenp = 0;
1768 		return 0;
1769 	}
1770 
1771 	i = (unsigned long *) table->data;
1772 	min = (unsigned long *) table->extra1;
1773 	max = (unsigned long *) table->extra2;
1774 	vleft = table->maxlen / sizeof(unsigned long);
1775 	left = *lenp;
1776 
1777 	for (; left && vleft--; i++, min++, max++, first=0) {
1778 		if (write) {
1779 			while (left) {
1780 				char c;
1781 				if (get_user(c, s))
1782 					return -EFAULT;
1783 				if (!isspace(c))
1784 					break;
1785 				left--;
1786 				s++;
1787 			}
1788 			if (!left)
1789 				break;
1790 			neg = 0;
1791 			len = left;
1792 			if (len > TMPBUFLEN-1)
1793 				len = TMPBUFLEN-1;
1794 			if (copy_from_user(buf, s, len))
1795 				return -EFAULT;
1796 			buf[len] = 0;
1797 			p = buf;
1798 			if (*p == '-' && left > 1) {
1799 				neg = 1;
1800 				left--, p++;
1801 			}
1802 			if (*p < '0' || *p > '9')
1803 				break;
1804 			val = simple_strtoul(p, &p, 0) * convmul / convdiv ;
1805 			len = p-buf;
1806 			if ((len < left) && *p && !isspace(*p))
1807 				break;
1808 			if (neg)
1809 				val = -val;
1810 			s += len;
1811 			left -= len;
1812 
1813 			if(neg)
1814 				continue;
1815 			if ((min && val < *min) || (max && val > *max))
1816 				continue;
1817 			*i = val;
1818 		} else {
1819 			p = buf;
1820 			if (!first)
1821 				*p++ = '\t';
1822 			sprintf(p, "%lu", convdiv * (*i) / convmul);
1823 			len = strlen(buf);
1824 			if (len > left)
1825 				len = left;
1826 			if(copy_to_user(s, buf, len))
1827 				return -EFAULT;
1828 			left -= len;
1829 			s += len;
1830 		}
1831 	}
1832 
1833 	if (!write && !first && left) {
1834 		if(put_user('\n', s))
1835 			return -EFAULT;
1836 		left--, s++;
1837 	}
1838 	if (write) {
1839 		while (left) {
1840 			char c;
1841 			if (get_user(c, s++))
1842 				return -EFAULT;
1843 			if (!isspace(c))
1844 				break;
1845 			left--;
1846 		}
1847 	}
1848 	if (write && first)
1849 		return -EINVAL;
1850 	*lenp -= left;
1851 	*ppos += *lenp;
1852 	return 0;
1853 #undef TMPBUFLEN
1854 }
1855 
1856 /**
1857  * proc_doulongvec_minmax - read a vector of long integers with min/max values
1858  * @table: the sysctl table
1859  * @write: %TRUE if this is a write to the sysctl file
1860  * @filp: the file structure
1861  * @buffer: the user buffer
1862  * @lenp: the size of the user buffer
1863  * @ppos: file position
1864  *
1865  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
1866  * values from/to the user buffer, treated as an ASCII string.
1867  *
1868  * This routine will ensure the values are within the range specified by
1869  * table->extra1 (min) and table->extra2 (max).
1870  *
1871  * Returns 0 on success.
1872  */
1873 int proc_doulongvec_minmax(ctl_table *table, int write, struct file *filp,
1874 			   void __user *buffer, size_t *lenp, loff_t *ppos)
1875 {
1876     return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l);
1877 }
1878 
1879 /**
1880  * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
1881  * @table: the sysctl table
1882  * @write: %TRUE if this is a write to the sysctl file
1883  * @filp: the file structure
1884  * @buffer: the user buffer
1885  * @lenp: the size of the user buffer
1886  * @ppos: file position
1887  *
1888  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
1889  * values from/to the user buffer, treated as an ASCII string. The values
1890  * are treated as milliseconds, and converted to jiffies when they are stored.
1891  *
1892  * This routine will ensure the values are within the range specified by
1893  * table->extra1 (min) and table->extra2 (max).
1894  *
1895  * Returns 0 on success.
1896  */
1897 int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int write,
1898 				      struct file *filp,
1899 				      void __user *buffer,
1900 				      size_t *lenp, loff_t *ppos)
1901 {
1902     return do_proc_doulongvec_minmax(table, write, filp, buffer,
1903 				     lenp, ppos, HZ, 1000l);
1904 }
1905 
1906 
1907 static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp,
1908 					 int *valp,
1909 					 int write, void *data)
1910 {
1911 	if (write) {
1912 		*valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
1913 	} else {
1914 		int val = *valp;
1915 		unsigned long lval;
1916 		if (val < 0) {
1917 			*negp = -1;
1918 			lval = (unsigned long)-val;
1919 		} else {
1920 			*negp = 0;
1921 			lval = (unsigned long)val;
1922 		}
1923 		*lvalp = lval / HZ;
1924 	}
1925 	return 0;
1926 }
1927 
1928 static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp,
1929 						int *valp,
1930 						int write, void *data)
1931 {
1932 	if (write) {
1933 		*valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
1934 	} else {
1935 		int val = *valp;
1936 		unsigned long lval;
1937 		if (val < 0) {
1938 			*negp = -1;
1939 			lval = (unsigned long)-val;
1940 		} else {
1941 			*negp = 0;
1942 			lval = (unsigned long)val;
1943 		}
1944 		*lvalp = jiffies_to_clock_t(lval);
1945 	}
1946 	return 0;
1947 }
1948 
1949 static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp,
1950 					    int *valp,
1951 					    int write, void *data)
1952 {
1953 	if (write) {
1954 		*valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
1955 	} else {
1956 		int val = *valp;
1957 		unsigned long lval;
1958 		if (val < 0) {
1959 			*negp = -1;
1960 			lval = (unsigned long)-val;
1961 		} else {
1962 			*negp = 0;
1963 			lval = (unsigned long)val;
1964 		}
1965 		*lvalp = jiffies_to_msecs(lval);
1966 	}
1967 	return 0;
1968 }
1969 
1970 /**
1971  * proc_dointvec_jiffies - read a vector of integers as seconds
1972  * @table: the sysctl table
1973  * @write: %TRUE if this is a write to the sysctl file
1974  * @filp: the file structure
1975  * @buffer: the user buffer
1976  * @lenp: the size of the user buffer
1977  * @ppos: file position
1978  *
1979  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1980  * values from/to the user buffer, treated as an ASCII string.
1981  * The values read are assumed to be in seconds, and are converted into
1982  * jiffies.
1983  *
1984  * Returns 0 on success.
1985  */
1986 int proc_dointvec_jiffies(ctl_table *table, int write, struct file *filp,
1987 			  void __user *buffer, size_t *lenp, loff_t *ppos)
1988 {
1989     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
1990 		    	    do_proc_dointvec_jiffies_conv,NULL);
1991 }
1992 
1993 /**
1994  * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
1995  * @table: the sysctl table
1996  * @write: %TRUE if this is a write to the sysctl file
1997  * @filp: the file structure
1998  * @buffer: the user buffer
1999  * @lenp: the size of the user buffer
2000  *
2001  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2002  * values from/to the user buffer, treated as an ASCII string.
2003  * The values read are assumed to be in 1/USER_HZ seconds, and
2004  * are converted into jiffies.
2005  *
2006  * Returns 0 on success.
2007  */
2008 int proc_dointvec_userhz_jiffies(ctl_table *table, int write, struct file *filp,
2009 				 void __user *buffer, size_t *lenp, loff_t *ppos)
2010 {
2011     return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2012 		    	    do_proc_dointvec_userhz_jiffies_conv,NULL);
2013 }
2014 
2015 /**
2016  * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2017  * @table: the sysctl table
2018  * @write: %TRUE if this is a write to the sysctl file
2019  * @filp: the file structure
2020  * @buffer: the user buffer
2021  * @lenp: the size of the user buffer
2022  * @ppos: file position
2023  * @ppos: the current position in the file
2024  *
2025  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2026  * values from/to the user buffer, treated as an ASCII string.
2027  * The values read are assumed to be in 1/1000 seconds, and
2028  * are converted into jiffies.
2029  *
2030  * Returns 0 on success.
2031  */
2032 int proc_dointvec_ms_jiffies(ctl_table *table, int write, struct file *filp,
2033 			     void __user *buffer, size_t *lenp, loff_t *ppos)
2034 {
2035 	return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2036 				do_proc_dointvec_ms_jiffies_conv, NULL);
2037 }
2038 
2039 #else /* CONFIG_PROC_FS */
2040 
2041 int proc_dostring(ctl_table *table, int write, struct file *filp,
2042 		  void __user *buffer, size_t *lenp, loff_t *ppos)
2043 {
2044 	return -ENOSYS;
2045 }
2046 
2047 static int proc_doutsstring(ctl_table *table, int write, struct file *filp,
2048 			    void __user *buffer, size_t *lenp, loff_t *ppos)
2049 {
2050 	return -ENOSYS;
2051 }
2052 
2053 int proc_dointvec(ctl_table *table, int write, struct file *filp,
2054 		  void __user *buffer, size_t *lenp, loff_t *ppos)
2055 {
2056 	return -ENOSYS;
2057 }
2058 
2059 int proc_dointvec_bset(ctl_table *table, int write, struct file *filp,
2060 			void __user *buffer, size_t *lenp, loff_t *ppos)
2061 {
2062 	return -ENOSYS;
2063 }
2064 
2065 int proc_dointvec_minmax(ctl_table *table, int write, struct file *filp,
2066 		    void __user *buffer, size_t *lenp, loff_t *ppos)
2067 {
2068 	return -ENOSYS;
2069 }
2070 
2071 int proc_dointvec_jiffies(ctl_table *table, int write, struct file *filp,
2072 		    void __user *buffer, size_t *lenp, loff_t *ppos)
2073 {
2074 	return -ENOSYS;
2075 }
2076 
2077 int proc_dointvec_userhz_jiffies(ctl_table *table, int write, struct file *filp,
2078 		    void __user *buffer, size_t *lenp, loff_t *ppos)
2079 {
2080 	return -ENOSYS;
2081 }
2082 
2083 int proc_dointvec_ms_jiffies(ctl_table *table, int write, struct file *filp,
2084 			     void __user *buffer, size_t *lenp, loff_t *ppos)
2085 {
2086 	return -ENOSYS;
2087 }
2088 
2089 int proc_doulongvec_minmax(ctl_table *table, int write, struct file *filp,
2090 		    void __user *buffer, size_t *lenp, loff_t *ppos)
2091 {
2092 	return -ENOSYS;
2093 }
2094 
2095 int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int write,
2096 				      struct file *filp,
2097 				      void __user *buffer,
2098 				      size_t *lenp, loff_t *ppos)
2099 {
2100     return -ENOSYS;
2101 }
2102 
2103 
2104 #endif /* CONFIG_PROC_FS */
2105 
2106 
2107 /*
2108  * General sysctl support routines
2109  */
2110 
2111 /* The generic string strategy routine: */
2112 int sysctl_string(ctl_table *table, int __user *name, int nlen,
2113 		  void __user *oldval, size_t __user *oldlenp,
2114 		  void __user *newval, size_t newlen, void **context)
2115 {
2116 	size_t l, len;
2117 
2118 	if (!table->data || !table->maxlen)
2119 		return -ENOTDIR;
2120 
2121 	if (oldval && oldlenp) {
2122 		if (get_user(len, oldlenp))
2123 			return -EFAULT;
2124 		if (len) {
2125 			l = strlen(table->data);
2126 			if (len > l) len = l;
2127 			if (len >= table->maxlen)
2128 				len = table->maxlen;
2129 			if(copy_to_user(oldval, table->data, len))
2130 				return -EFAULT;
2131 			if(put_user(0, ((char __user *) oldval) + len))
2132 				return -EFAULT;
2133 			if(put_user(len, oldlenp))
2134 				return -EFAULT;
2135 		}
2136 	}
2137 	if (newval && newlen) {
2138 		len = newlen;
2139 		if (len > table->maxlen)
2140 			len = table->maxlen;
2141 		if(copy_from_user(table->data, newval, len))
2142 			return -EFAULT;
2143 		if (len == table->maxlen)
2144 			len--;
2145 		((char *) table->data)[len] = 0;
2146 	}
2147 	return 0;
2148 }
2149 
2150 /*
2151  * This function makes sure that all of the integers in the vector
2152  * are between the minimum and maximum values given in the arrays
2153  * table->extra1 and table->extra2, respectively.
2154  */
2155 int sysctl_intvec(ctl_table *table, int __user *name, int nlen,
2156 		void __user *oldval, size_t __user *oldlenp,
2157 		void __user *newval, size_t newlen, void **context)
2158 {
2159 
2160 	if (newval && newlen) {
2161 		int __user *vec = (int __user *) newval;
2162 		int *min = (int *) table->extra1;
2163 		int *max = (int *) table->extra2;
2164 		size_t length;
2165 		int i;
2166 
2167 		if (newlen % sizeof(int) != 0)
2168 			return -EINVAL;
2169 
2170 		if (!table->extra1 && !table->extra2)
2171 			return 0;
2172 
2173 		if (newlen > table->maxlen)
2174 			newlen = table->maxlen;
2175 		length = newlen / sizeof(int);
2176 
2177 		for (i = 0; i < length; i++) {
2178 			int value;
2179 			if (get_user(value, vec + i))
2180 				return -EFAULT;
2181 			if (min && value < min[i])
2182 				return -EINVAL;
2183 			if (max && value > max[i])
2184 				return -EINVAL;
2185 		}
2186 	}
2187 	return 0;
2188 }
2189 
2190 /* Strategy function to convert jiffies to seconds */
2191 int sysctl_jiffies(ctl_table *table, int __user *name, int nlen,
2192 		void __user *oldval, size_t __user *oldlenp,
2193 		void __user *newval, size_t newlen, void **context)
2194 {
2195 	if (oldval) {
2196 		size_t olen;
2197 		if (oldlenp) {
2198 			if (get_user(olen, oldlenp))
2199 				return -EFAULT;
2200 			if (olen!=sizeof(int))
2201 				return -EINVAL;
2202 		}
2203 		if (put_user(*(int *)(table->data)/HZ, (int __user *)oldval) ||
2204 		    (oldlenp && put_user(sizeof(int),oldlenp)))
2205 			return -EFAULT;
2206 	}
2207 	if (newval && newlen) {
2208 		int new;
2209 		if (newlen != sizeof(int))
2210 			return -EINVAL;
2211 		if (get_user(new, (int __user *)newval))
2212 			return -EFAULT;
2213 		*(int *)(table->data) = new*HZ;
2214 	}
2215 	return 1;
2216 }
2217 
2218 /* Strategy function to convert jiffies to seconds */
2219 int sysctl_ms_jiffies(ctl_table *table, int __user *name, int nlen,
2220 		void __user *oldval, size_t __user *oldlenp,
2221 		void __user *newval, size_t newlen, void **context)
2222 {
2223 	if (oldval) {
2224 		size_t olen;
2225 		if (oldlenp) {
2226 			if (get_user(olen, oldlenp))
2227 				return -EFAULT;
2228 			if (olen!=sizeof(int))
2229 				return -EINVAL;
2230 		}
2231 		if (put_user(jiffies_to_msecs(*(int *)(table->data)), (int __user *)oldval) ||
2232 		    (oldlenp && put_user(sizeof(int),oldlenp)))
2233 			return -EFAULT;
2234 	}
2235 	if (newval && newlen) {
2236 		int new;
2237 		if (newlen != sizeof(int))
2238 			return -EINVAL;
2239 		if (get_user(new, (int __user *)newval))
2240 			return -EFAULT;
2241 		*(int *)(table->data) = msecs_to_jiffies(new);
2242 	}
2243 	return 1;
2244 }
2245 
2246 #else /* CONFIG_SYSCTL */
2247 
2248 
2249 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
2250 {
2251 	return -ENOSYS;
2252 }
2253 
2254 int sysctl_string(ctl_table *table, int __user *name, int nlen,
2255 		  void __user *oldval, size_t __user *oldlenp,
2256 		  void __user *newval, size_t newlen, void **context)
2257 {
2258 	return -ENOSYS;
2259 }
2260 
2261 int sysctl_intvec(ctl_table *table, int __user *name, int nlen,
2262 		void __user *oldval, size_t __user *oldlenp,
2263 		void __user *newval, size_t newlen, void **context)
2264 {
2265 	return -ENOSYS;
2266 }
2267 
2268 int sysctl_jiffies(ctl_table *table, int __user *name, int nlen,
2269 		void __user *oldval, size_t __user *oldlenp,
2270 		void __user *newval, size_t newlen, void **context)
2271 {
2272 	return -ENOSYS;
2273 }
2274 
2275 int sysctl_ms_jiffies(ctl_table *table, int __user *name, int nlen,
2276 		void __user *oldval, size_t __user *oldlenp,
2277 		void __user *newval, size_t newlen, void **context)
2278 {
2279 	return -ENOSYS;
2280 }
2281 
2282 int proc_dostring(ctl_table *table, int write, struct file *filp,
2283 		  void __user *buffer, size_t *lenp, loff_t *ppos)
2284 {
2285 	return -ENOSYS;
2286 }
2287 
2288 int proc_dointvec(ctl_table *table, int write, struct file *filp,
2289 		  void __user *buffer, size_t *lenp, loff_t *ppos)
2290 {
2291 	return -ENOSYS;
2292 }
2293 
2294 int proc_dointvec_bset(ctl_table *table, int write, struct file *filp,
2295 			void __user *buffer, size_t *lenp, loff_t *ppos)
2296 {
2297 	return -ENOSYS;
2298 }
2299 
2300 int proc_dointvec_minmax(ctl_table *table, int write, struct file *filp,
2301 		    void __user *buffer, size_t *lenp, loff_t *ppos)
2302 {
2303 	return -ENOSYS;
2304 }
2305 
2306 int proc_dointvec_jiffies(ctl_table *table, int write, struct file *filp,
2307 			  void __user *buffer, size_t *lenp, loff_t *ppos)
2308 {
2309 	return -ENOSYS;
2310 }
2311 
2312 int proc_dointvec_userhz_jiffies(ctl_table *table, int write, struct file *filp,
2313 			  void __user *buffer, size_t *lenp, loff_t *ppos)
2314 {
2315 	return -ENOSYS;
2316 }
2317 
2318 int proc_dointvec_ms_jiffies(ctl_table *table, int write, struct file *filp,
2319 			     void __user *buffer, size_t *lenp, loff_t *ppos)
2320 {
2321 	return -ENOSYS;
2322 }
2323 
2324 int proc_doulongvec_minmax(ctl_table *table, int write, struct file *filp,
2325 		    void __user *buffer, size_t *lenp, loff_t *ppos)
2326 {
2327 	return -ENOSYS;
2328 }
2329 
2330 int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int write,
2331 				      struct file *filp,
2332 				      void __user *buffer,
2333 				      size_t *lenp, loff_t *ppos)
2334 {
2335     return -ENOSYS;
2336 }
2337 
2338 struct ctl_table_header * register_sysctl_table(ctl_table * table,
2339 						int insert_at_head)
2340 {
2341 	return NULL;
2342 }
2343 
2344 void unregister_sysctl_table(struct ctl_table_header * table)
2345 {
2346 }
2347 
2348 #endif /* CONFIG_SYSCTL */
2349 
2350 /*
2351  * No sense putting this after each symbol definition, twice,
2352  * exception granted :-)
2353  */
2354 EXPORT_SYMBOL(proc_dointvec);
2355 EXPORT_SYMBOL(proc_dointvec_jiffies);
2356 EXPORT_SYMBOL(proc_dointvec_minmax);
2357 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2358 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2359 EXPORT_SYMBOL(proc_dostring);
2360 EXPORT_SYMBOL(proc_doulongvec_minmax);
2361 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
2362 EXPORT_SYMBOL(register_sysctl_table);
2363 EXPORT_SYMBOL(sysctl_intvec);
2364 EXPORT_SYMBOL(sysctl_jiffies);
2365 EXPORT_SYMBOL(sysctl_ms_jiffies);
2366 EXPORT_SYMBOL(sysctl_string);
2367 EXPORT_SYMBOL(unregister_sysctl_table);
2368