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