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[PATCH] mm: fix bug in brk()
[linux-2.6.22.y-op.git] / kernel / sysctl.c
blobe82726faeeffb4850cc49cc6e112cf28b143d4cb
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/capability.h>
29 #include <linux/ctype.h>
30 #include <linux/utsname.h>
31 #include <linux/capability.h>
32 #include <linux/smp_lock.h>
33 #include <linux/init.h>
34 #include <linux/kernel.h>
35 #include <linux/kobject.h>
36 #include <linux/net.h>
37 #include <linux/sysrq.h>
38 #include <linux/highuid.h>
39 #include <linux/writeback.h>
40 #include <linux/hugetlb.h>
41 #include <linux/security.h>
42 #include <linux/initrd.h>
43 #include <linux/times.h>
44 #include <linux/limits.h>
45 #include <linux/dcache.h>
46 #include <linux/syscalls.h>
47 #include <linux/nfs_fs.h>
48 #include <linux/acpi.h>
49
50 #include <asm/uaccess.h>
51 #include <asm/processor.h>
52
53 extern int proc_nr_files(ctl_table *table, int write, struct file *filp,
54 void __user *buffer, size_t *lenp, loff_t *ppos);
55
56 #if defined(CONFIG_SYSCTL)
57
58 /* External variables not in a header file. */
59 extern int C_A_D;
60 extern int sysctl_overcommit_memory;
61 extern int sysctl_overcommit_ratio;
62 extern int max_threads;
63 extern int sysrq_enabled;
64 extern int core_uses_pid;
65 extern int suid_dumpable;
66 extern char core_pattern[];
67 extern int cad_pid;
68 extern int pid_max;
69 extern int min_free_kbytes;
70 extern int printk_ratelimit_jiffies;
71 extern int printk_ratelimit_burst;
72 extern int pid_max_min, pid_max_max;
73 extern int sysctl_drop_caches;
74 extern int percpu_pagelist_fraction;
75
76 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
77 int unknown_nmi_panic;
78 extern int proc_unknown_nmi_panic(ctl_table *, int, struct file *,
79 void __user *, size_t *, loff_t *);
80 #endif
81
82 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
83 static int maxolduid = 65535;
84 static int minolduid;
85 static int min_percpu_pagelist_fract = 8;
86
87 static int ngroups_max = NGROUPS_MAX;
88
89 #ifdef CONFIG_KMOD
90 extern char modprobe_path[];
91 #endif
92 #ifdef CONFIG_CHR_DEV_SG
93 extern int sg_big_buff;
94 #endif
95 #ifdef CONFIG_SYSVIPC
96 extern size_t shm_ctlmax;
97 extern size_t shm_ctlall;
98 extern int shm_ctlmni;
99 extern int msg_ctlmax;
100 extern int msg_ctlmnb;
101 extern int msg_ctlmni;
102 extern int sem_ctls[];
103 #endif
104
105 #ifdef __sparc__
106 extern char reboot_command [];
107 extern int stop_a_enabled;
108 extern int scons_pwroff;
109 #endif
110
111 #ifdef __hppa__
112 extern int pwrsw_enabled;
113 extern int unaligned_enabled;
114 #endif
115
116 #ifdef CONFIG_S390
117 #ifdef CONFIG_MATHEMU
118 extern int sysctl_ieee_emulation_warnings;
119 #endif
120 extern int sysctl_userprocess_debug;
121 extern int spin_retry;
122 #endif
123
124 extern int sysctl_hz_timer;
125
126 #ifdef CONFIG_BSD_PROCESS_ACCT
127 extern int acct_parm[];
128 #endif
129
130 #ifdef CONFIG_IA64
131 extern int no_unaligned_warning;
132 #endif
133
134 static int parse_table(int __user *, int, void __user *, size_t __user *, void __user *, size_t,
135 ctl_table *, void **);
136 static int proc_doutsstring(ctl_table *table, int write, struct file *filp,
137 void __user *buffer, size_t *lenp, loff_t *ppos);
138
139 static ctl_table root_table[];
140 static struct ctl_table_header root_table_header =
141 { root_table, LIST_HEAD_INIT(root_table_header.ctl_entry) };
142
143 static ctl_table kern_table[];
144 static ctl_table vm_table[];
145 static ctl_table proc_table[];
146 static ctl_table fs_table[];
147 static ctl_table debug_table[];
148 static ctl_table dev_table[];
149 extern ctl_table random_table[];
150 #ifdef CONFIG_UNIX98_PTYS
151 extern ctl_table pty_table[];
152 #endif
153 #ifdef CONFIG_INOTIFY
154 extern ctl_table inotify_table[];
155 #endif
156
157 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
158 int sysctl_legacy_va_layout;
159 #endif
160
161 /* /proc declarations: */
162
163 #ifdef CONFIG_PROC_FS
164
165 static ssize_t proc_readsys(struct file *, char __user *, size_t, loff_t *);
166 static ssize_t proc_writesys(struct file *, const char __user *, size_t, loff_t *);
167 static int proc_opensys(struct inode *, struct file *);
168
169 struct file_operations proc_sys_file_operations = {
170 .open = proc_opensys,
171 .read = proc_readsys,
172 .write = proc_writesys,
173 };
174
175 extern struct proc_dir_entry *proc_sys_root;
176
177 static void register_proc_table(ctl_table *, struct proc_dir_entry *, void *);
178 static void unregister_proc_table(ctl_table *, struct proc_dir_entry *);
179 #endif
180
181 /* The default sysctl tables: */
182
183 static ctl_table root_table[] = {
184 {
185 .ctl_name = CTL_KERN,
186 .procname = "kernel",
187 .mode = 0555,
188 .child = kern_table,
189 },
190 {
191 .ctl_name = CTL_VM,
192 .procname = "vm",
193 .mode = 0555,
194 .child = vm_table,
195 },
196 #ifdef CONFIG_NET
197 {
198 .ctl_name = CTL_NET,
199 .procname = "net",
200 .mode = 0555,
201 .child = net_table,
202 },
203 #endif
204 {
205 .ctl_name = CTL_PROC,
206 .procname = "proc",
207 .mode = 0555,
208 .child = proc_table,
209 },
210 {
211 .ctl_name = CTL_FS,
212 .procname = "fs",
213 .mode = 0555,
214 .child = fs_table,
215 },
216 {
217 .ctl_name = CTL_DEBUG,
218 .procname = "debug",
219 .mode = 0555,
220 .child = debug_table,
221 },
222 {
223 .ctl_name = CTL_DEV,
224 .procname = "dev",
225 .mode = 0555,
226 .child = dev_table,
227 },
228
229 { .ctl_name = 0 }
230 };
231
232 static ctl_table kern_table[] = {
233 {
234 .ctl_name = KERN_OSTYPE,
235 .procname = "ostype",
236 .data = system_utsname.sysname,
237 .maxlen = sizeof(system_utsname.sysname),
238 .mode = 0444,
239 .proc_handler = &proc_doutsstring,
240 .strategy = &sysctl_string,
241 },
242 {
243 .ctl_name = KERN_OSRELEASE,
244 .procname = "osrelease",
245 .data = system_utsname.release,
246 .maxlen = sizeof(system_utsname.release),
247 .mode = 0444,
248 .proc_handler = &proc_doutsstring,
249 .strategy = &sysctl_string,
250 },
251 {
252 .ctl_name = KERN_VERSION,
253 .procname = "version",
254 .data = system_utsname.version,
255 .maxlen = sizeof(system_utsname.version),
256 .mode = 0444,
257 .proc_handler = &proc_doutsstring,
258 .strategy = &sysctl_string,
259 },
260 {
261 .ctl_name = KERN_NODENAME,
262 .procname = "hostname",
263 .data = system_utsname.nodename,
264 .maxlen = sizeof(system_utsname.nodename),
265 .mode = 0644,
266 .proc_handler = &proc_doutsstring,
267 .strategy = &sysctl_string,
268 },
269 {
270 .ctl_name = KERN_DOMAINNAME,
271 .procname = "domainname",
272 .data = system_utsname.domainname,
273 .maxlen = sizeof(system_utsname.domainname),
274 .mode = 0644,
275 .proc_handler = &proc_doutsstring,
276 .strategy = &sysctl_string,
277 },
278 {
279 .ctl_name = KERN_PANIC,
280 .procname = "panic",
281 .data = &panic_timeout,
282 .maxlen = sizeof(int),
283 .mode = 0644,
284 .proc_handler = &proc_dointvec,
285 },
286 {
287 .ctl_name = KERN_CORE_USES_PID,
288 .procname = "core_uses_pid",
289 .data = &core_uses_pid,
290 .maxlen = sizeof(int),
291 .mode = 0644,
292 .proc_handler = &proc_dointvec,
293 },
294 {
295 .ctl_name = KERN_CORE_PATTERN,
296 .procname = "core_pattern",
297 .data = core_pattern,
298 .maxlen = 64,
299 .mode = 0644,
300 .proc_handler = &proc_dostring,
301 .strategy = &sysctl_string,
302 },
303 {
304 .ctl_name = KERN_TAINTED,
305 .procname = "tainted",
306 .data = &tainted,
307 .maxlen = sizeof(int),
308 .mode = 0444,
309 .proc_handler = &proc_dointvec,
310 },
311 {
312 .ctl_name = KERN_CAP_BSET,
313 .procname = "cap-bound",
314 .data = &cap_bset,
315 .maxlen = sizeof(kernel_cap_t),
316 .mode = 0600,
317 .proc_handler = &proc_dointvec_bset,
318 },
319 #ifdef CONFIG_BLK_DEV_INITRD
320 {
321 .ctl_name = KERN_REALROOTDEV,
322 .procname = "real-root-dev",
323 .data = &real_root_dev,
324 .maxlen = sizeof(int),
325 .mode = 0644,
326 .proc_handler = &proc_dointvec,
327 },
328 #endif
329 #ifdef __sparc__
330 {
331 .ctl_name = KERN_SPARC_REBOOT,
332 .procname = "reboot-cmd",
333 .data = reboot_command,
334 .maxlen = 256,
335 .mode = 0644,
336 .proc_handler = &proc_dostring,
337 .strategy = &sysctl_string,
338 },
339 {
340 .ctl_name = KERN_SPARC_STOP_A,
341 .procname = "stop-a",
342 .data = &stop_a_enabled,
343 .maxlen = sizeof (int),
344 .mode = 0644,
345 .proc_handler = &proc_dointvec,
346 },
347 {
348 .ctl_name = KERN_SPARC_SCONS_PWROFF,
349 .procname = "scons-poweroff",
350 .data = &scons_pwroff,
351 .maxlen = sizeof (int),
352 .mode = 0644,
353 .proc_handler = &proc_dointvec,
354 },
355 #endif
356 #ifdef __hppa__
357 {
358 .ctl_name = KERN_HPPA_PWRSW,
359 .procname = "soft-power",
360 .data = &pwrsw_enabled,
361 .maxlen = sizeof (int),
362 .mode = 0644,
363 .proc_handler = &proc_dointvec,
364 },
365 {
366 .ctl_name = KERN_HPPA_UNALIGNED,
367 .procname = "unaligned-trap",
368 .data = &unaligned_enabled,
369 .maxlen = sizeof (int),
370 .mode = 0644,
371 .proc_handler = &proc_dointvec,
372 },
373 #endif
374 {
375 .ctl_name = KERN_CTLALTDEL,
376 .procname = "ctrl-alt-del",
377 .data = &C_A_D,
378 .maxlen = sizeof(int),
379 .mode = 0644,
380 .proc_handler = &proc_dointvec,
381 },
382 {
383 .ctl_name = KERN_PRINTK,
384 .procname = "printk",
385 .data = &console_loglevel,
386 .maxlen = 4*sizeof(int),
387 .mode = 0644,
388 .proc_handler = &proc_dointvec,
389 },
390 #ifdef CONFIG_KMOD
391 {
392 .ctl_name = KERN_MODPROBE,
393 .procname = "modprobe",
394 .data = &modprobe_path,
395 .maxlen = KMOD_PATH_LEN,
396 .mode = 0644,
397 .proc_handler = &proc_dostring,
398 .strategy = &sysctl_string,
399 },
400 #endif
401 #ifdef CONFIG_HOTPLUG
402 {
403 .ctl_name = KERN_HOTPLUG,
404 .procname = "hotplug",
405 .data = &uevent_helper,
406 .maxlen = UEVENT_HELPER_PATH_LEN,
407 .mode = 0644,
408 .proc_handler = &proc_dostring,
409 .strategy = &sysctl_string,
410 },
411 #endif
412 #ifdef CONFIG_CHR_DEV_SG
413 {
414 .ctl_name = KERN_SG_BIG_BUFF,
415 .procname = "sg-big-buff",
416 .data = &sg_big_buff,
417 .maxlen = sizeof (int),
418 .mode = 0444,
419 .proc_handler = &proc_dointvec,
420 },
421 #endif
422 #ifdef CONFIG_BSD_PROCESS_ACCT
423 {
424 .ctl_name = KERN_ACCT,
425 .procname = "acct",
426 .data = &acct_parm,
427 .maxlen = 3*sizeof(int),
428 .mode = 0644,
429 .proc_handler = &proc_dointvec,
430 },
431 #endif
432 #ifdef CONFIG_SYSVIPC
433 {
434 .ctl_name = KERN_SHMMAX,
435 .procname = "shmmax",
436 .data = &shm_ctlmax,
437 .maxlen = sizeof (size_t),
438 .mode = 0644,
439 .proc_handler = &proc_doulongvec_minmax,
440 },
441 {
442 .ctl_name = KERN_SHMALL,
443 .procname = "shmall",
444 .data = &shm_ctlall,
445 .maxlen = sizeof (size_t),
446 .mode = 0644,
447 .proc_handler = &proc_doulongvec_minmax,
448 },
449 {
450 .ctl_name = KERN_SHMMNI,
451 .procname = "shmmni",
452 .data = &shm_ctlmni,
453 .maxlen = sizeof (int),
454 .mode = 0644,
455 .proc_handler = &proc_dointvec,
456 },
457 {
458 .ctl_name = KERN_MSGMAX,
459 .procname = "msgmax",
460 .data = &msg_ctlmax,
461 .maxlen = sizeof (int),
462 .mode = 0644,
463 .proc_handler = &proc_dointvec,
464 },
465 {
466 .ctl_name = KERN_MSGMNI,
467 .procname = "msgmni",
468 .data = &msg_ctlmni,
469 .maxlen = sizeof (int),
470 .mode = 0644,
471 .proc_handler = &proc_dointvec,
472 },
473 {
474 .ctl_name = KERN_MSGMNB,
475 .procname = "msgmnb",
476 .data = &msg_ctlmnb,
477 .maxlen = sizeof (int),
478 .mode = 0644,
479 .proc_handler = &proc_dointvec,
480 },
481 {
482 .ctl_name = KERN_SEM,
483 .procname = "sem",
484 .data = &sem_ctls,
485 .maxlen = 4*sizeof (int),
486 .mode = 0644,
487 .proc_handler = &proc_dointvec,
488 },
489 #endif
490 #ifdef CONFIG_MAGIC_SYSRQ
491 {
492 .ctl_name = KERN_SYSRQ,
493 .procname = "sysrq",
494 .data = &sysrq_enabled,
495 .maxlen = sizeof (int),
496 .mode = 0644,
497 .proc_handler = &proc_dointvec,
498 },
499 #endif
500 {
501 .ctl_name = KERN_CADPID,
502 .procname = "cad_pid",
503 .data = &cad_pid,
504 .maxlen = sizeof (int),
505 .mode = 0600,
506 .proc_handler = &proc_dointvec,
507 },
508 {
509 .ctl_name = KERN_MAX_THREADS,
510 .procname = "threads-max",
511 .data = &max_threads,
512 .maxlen = sizeof(int),
513 .mode = 0644,
514 .proc_handler = &proc_dointvec,
515 },
516 {
517 .ctl_name = KERN_RANDOM,
518 .procname = "random",
519 .mode = 0555,
520 .child = random_table,
521 },
522 #ifdef CONFIG_UNIX98_PTYS
523 {
524 .ctl_name = KERN_PTY,
525 .procname = "pty",
526 .mode = 0555,
527 .child = pty_table,
528 },
529 #endif
530 {
531 .ctl_name = KERN_OVERFLOWUID,
532 .procname = "overflowuid",
533 .data = &overflowuid,
534 .maxlen = sizeof(int),
535 .mode = 0644,
536 .proc_handler = &proc_dointvec_minmax,
537 .strategy = &sysctl_intvec,
538 .extra1 = &minolduid,
539 .extra2 = &maxolduid,
540 },
541 {
542 .ctl_name = KERN_OVERFLOWGID,
543 .procname = "overflowgid",
544 .data = &overflowgid,
545 .maxlen = sizeof(int),
546 .mode = 0644,
547 .proc_handler = &proc_dointvec_minmax,
548 .strategy = &sysctl_intvec,
549 .extra1 = &minolduid,
550 .extra2 = &maxolduid,
551 },
552 #ifdef CONFIG_S390
553 #ifdef CONFIG_MATHEMU
554 {
555 .ctl_name = KERN_IEEE_EMULATION_WARNINGS,
556 .procname = "ieee_emulation_warnings",
557 .data = &sysctl_ieee_emulation_warnings,
558 .maxlen = sizeof(int),
559 .mode = 0644,
560 .proc_handler = &proc_dointvec,
561 },
562 #endif
563 #ifdef CONFIG_NO_IDLE_HZ
564 {
565 .ctl_name = KERN_HZ_TIMER,
566 .procname = "hz_timer",
567 .data = &sysctl_hz_timer,
568 .maxlen = sizeof(int),
569 .mode = 0644,
570 .proc_handler = &proc_dointvec,
571 },
572 #endif
573 {
574 .ctl_name = KERN_S390_USER_DEBUG_LOGGING,
575 .procname = "userprocess_debug",
576 .data = &sysctl_userprocess_debug,
577 .maxlen = sizeof(int),
578 .mode = 0644,
579 .proc_handler = &proc_dointvec,
580 },
581 #endif
582 {
583 .ctl_name = KERN_PIDMAX,
584 .procname = "pid_max",
585 .data = &pid_max,
586 .maxlen = sizeof (int),
587 .mode = 0644,
588 .proc_handler = &proc_dointvec_minmax,
589 .strategy = sysctl_intvec,
590 .extra1 = &pid_max_min,
591 .extra2 = &pid_max_max,
592 },
593 {
594 .ctl_name = KERN_PANIC_ON_OOPS,
595 .procname = "panic_on_oops",
596 .data = &panic_on_oops,
597 .maxlen = sizeof(int),
598 .mode = 0644,
599 .proc_handler = &proc_dointvec,
600 },
601 {
602 .ctl_name = KERN_PRINTK_RATELIMIT,
603 .procname = "printk_ratelimit",
604 .data = &printk_ratelimit_jiffies,
605 .maxlen = sizeof(int),
606 .mode = 0644,
607 .proc_handler = &proc_dointvec_jiffies,
608 .strategy = &sysctl_jiffies,
609 },
610 {
611 .ctl_name = KERN_PRINTK_RATELIMIT_BURST,
612 .procname = "printk_ratelimit_burst",
613 .data = &printk_ratelimit_burst,
614 .maxlen = sizeof(int),
615 .mode = 0644,
616 .proc_handler = &proc_dointvec,
617 },
618 {
619 .ctl_name = KERN_NGROUPS_MAX,
620 .procname = "ngroups_max",
621 .data = &ngroups_max,
622 .maxlen = sizeof (int),
623 .mode = 0444,
624 .proc_handler = &proc_dointvec,
625 },
626 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
627 {
628 .ctl_name = KERN_UNKNOWN_NMI_PANIC,
629 .procname = "unknown_nmi_panic",
630 .data = &unknown_nmi_panic,
631 .maxlen = sizeof (int),
632 .mode = 0644,
633 .proc_handler = &proc_unknown_nmi_panic,
634 },
635 #endif
636 #if defined(CONFIG_X86)
637 {
638 .ctl_name = KERN_BOOTLOADER_TYPE,
639 .procname = "bootloader_type",
640 .data = &bootloader_type,
641 .maxlen = sizeof (int),
642 .mode = 0444,
643 .proc_handler = &proc_dointvec,
644 },
645 #endif
646 #if defined(CONFIG_MMU)
647 {
648 .ctl_name = KERN_RANDOMIZE,
649 .procname = "randomize_va_space",
650 .data = &randomize_va_space,
651 .maxlen = sizeof(int),
652 .mode = 0644,
653 .proc_handler = &proc_dointvec,
654 },
655 #endif
656 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
657 {
658 .ctl_name = KERN_SPIN_RETRY,
659 .procname = "spin_retry",
660 .data = &spin_retry,
661 .maxlen = sizeof (int),
662 .mode = 0644,
663 .proc_handler = &proc_dointvec,
664 },
665 #endif
666 #ifdef CONFIG_ACPI_SLEEP
667 {
668 .ctl_name = KERN_ACPI_VIDEO_FLAGS,
669 .procname = "acpi_video_flags",
670 .data = &acpi_video_flags,
671 .maxlen = sizeof (unsigned long),
672 .mode = 0644,
673 .proc_handler = &proc_doulongvec_minmax,
674 },
675 #endif
676 #ifdef CONFIG_IA64
677 {
678 .ctl_name = KERN_IA64_UNALIGNED,
679 .procname = "ignore-unaligned-usertrap",
680 .data = &no_unaligned_warning,
681 .maxlen = sizeof (int),
682 .mode = 0644,
683 .proc_handler = &proc_dointvec,
684 },
685 #endif
686 { .ctl_name = 0 }
687 };
688
689 /* Constants for minimum and maximum testing in vm_table.
690 We use these as one-element integer vectors. */
691 static int zero;
692 static int one_hundred = 100;
693
694
695 static ctl_table vm_table[] = {
696 {
697 .ctl_name = VM_OVERCOMMIT_MEMORY,
698 .procname = "overcommit_memory",
699 .data = &sysctl_overcommit_memory,
700 .maxlen = sizeof(sysctl_overcommit_memory),
701 .mode = 0644,
702 .proc_handler = &proc_dointvec,
703 },
704 {
705 .ctl_name = VM_OVERCOMMIT_RATIO,
706 .procname = "overcommit_ratio",
707 .data = &sysctl_overcommit_ratio,
708 .maxlen = sizeof(sysctl_overcommit_ratio),
709 .mode = 0644,
710 .proc_handler = &proc_dointvec,
711 },
712 {
713 .ctl_name = VM_PAGE_CLUSTER,
714 .procname = "page-cluster",
715 .data = &page_cluster,
716 .maxlen = sizeof(int),
717 .mode = 0644,
718 .proc_handler = &proc_dointvec,
719 },
720 {
721 .ctl_name = VM_DIRTY_BACKGROUND,
722 .procname = "dirty_background_ratio",
723 .data = &dirty_background_ratio,
724 .maxlen = sizeof(dirty_background_ratio),
725 .mode = 0644,
726 .proc_handler = &proc_dointvec_minmax,
727 .strategy = &sysctl_intvec,
728 .extra1 = &zero,
729 .extra2 = &one_hundred,
730 },
731 {
732 .ctl_name = VM_DIRTY_RATIO,
733 .procname = "dirty_ratio",
734 .data = &vm_dirty_ratio,
735 .maxlen = sizeof(vm_dirty_ratio),
736 .mode = 0644,
737 .proc_handler = &proc_dointvec_minmax,
738 .strategy = &sysctl_intvec,
739 .extra1 = &zero,
740 .extra2 = &one_hundred,
741 },
742 {
743 .ctl_name = VM_DIRTY_WB_CS,
744 .procname = "dirty_writeback_centisecs",
745 .data = &dirty_writeback_interval,
746 .maxlen = sizeof(dirty_writeback_interval),
747 .mode = 0644,
748 .proc_handler = &dirty_writeback_centisecs_handler,
749 },
750 {
751 .ctl_name = VM_DIRTY_EXPIRE_CS,
752 .procname = "dirty_expire_centisecs",
753 .data = &dirty_expire_interval,
754 .maxlen = sizeof(dirty_expire_interval),
755 .mode = 0644,
756 .proc_handler = &proc_dointvec_userhz_jiffies,
757 },
758 {
759 .ctl_name = VM_NR_PDFLUSH_THREADS,
760 .procname = "nr_pdflush_threads",
761 .data = &nr_pdflush_threads,
762 .maxlen = sizeof nr_pdflush_threads,
763 .mode = 0444 /* read-only*/,
764 .proc_handler = &proc_dointvec,
765 },
766 {
767 .ctl_name = VM_SWAPPINESS,
768 .procname = "swappiness",
769 .data = &vm_swappiness,
770 .maxlen = sizeof(vm_swappiness),
771 .mode = 0644,
772 .proc_handler = &proc_dointvec_minmax,
773 .strategy = &sysctl_intvec,
774 .extra1 = &zero,
775 .extra2 = &one_hundred,
776 },
777 #ifdef CONFIG_HUGETLB_PAGE
778 {
779 .ctl_name = VM_HUGETLB_PAGES,
780 .procname = "nr_hugepages",
781 .data = &max_huge_pages,
782 .maxlen = sizeof(unsigned long),
783 .mode = 0644,
784 .proc_handler = &hugetlb_sysctl_handler,
785 .extra1 = (void *)&hugetlb_zero,
786 .extra2 = (void *)&hugetlb_infinity,
787 },
788 {
789 .ctl_name = VM_HUGETLB_GROUP,
790 .procname = "hugetlb_shm_group",
791 .data = &sysctl_hugetlb_shm_group,
792 .maxlen = sizeof(gid_t),
793 .mode = 0644,
794 .proc_handler = &proc_dointvec,
795 },
796 #endif
797 {
798 .ctl_name = VM_LOWMEM_RESERVE_RATIO,
799 .procname = "lowmem_reserve_ratio",
800 .data = &sysctl_lowmem_reserve_ratio,
801 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
802 .mode = 0644,
803 .proc_handler = &lowmem_reserve_ratio_sysctl_handler,
804 .strategy = &sysctl_intvec,
805 },
806 {
807 .ctl_name = VM_DROP_PAGECACHE,
808 .procname = "drop_caches",
809 .data = &sysctl_drop_caches,
810 .maxlen = sizeof(int),
811 .mode = 0644,
812 .proc_handler = drop_caches_sysctl_handler,
813 .strategy = &sysctl_intvec,
814 },
815 {
816 .ctl_name = VM_MIN_FREE_KBYTES,
817 .procname = "min_free_kbytes",
818 .data = &min_free_kbytes,
819 .maxlen = sizeof(min_free_kbytes),
820 .mode = 0644,
821 .proc_handler = &min_free_kbytes_sysctl_handler,
822 .strategy = &sysctl_intvec,
823 .extra1 = &zero,
824 },
825 {
826 .ctl_name = VM_PERCPU_PAGELIST_FRACTION,
827 .procname = "percpu_pagelist_fraction",
828 .data = &percpu_pagelist_fraction,
829 .maxlen = sizeof(percpu_pagelist_fraction),
830 .mode = 0644,
831 .proc_handler = &percpu_pagelist_fraction_sysctl_handler,
832 .strategy = &sysctl_intvec,
833 .extra1 = &min_percpu_pagelist_fract,
834 },
835 #ifdef CONFIG_MMU
836 {
837 .ctl_name = VM_MAX_MAP_COUNT,
838 .procname = "max_map_count",
839 .data = &sysctl_max_map_count,
840 .maxlen = sizeof(sysctl_max_map_count),
841 .mode = 0644,
842 .proc_handler = &proc_dointvec
843 },
844 #endif
845 {
846 .ctl_name = VM_LAPTOP_MODE,
847 .procname = "laptop_mode",
848 .data = &laptop_mode,
849 .maxlen = sizeof(laptop_mode),
850 .mode = 0644,
851 .proc_handler = &proc_dointvec_jiffies,
852 .strategy = &sysctl_jiffies,
853 },
854 {
855 .ctl_name = VM_BLOCK_DUMP,
856 .procname = "block_dump",
857 .data = &block_dump,
858 .maxlen = sizeof(block_dump),
859 .mode = 0644,
860 .proc_handler = &proc_dointvec,
861 .strategy = &sysctl_intvec,
862 .extra1 = &zero,
863 },
864 {
865 .ctl_name = VM_VFS_CACHE_PRESSURE,
866 .procname = "vfs_cache_pressure",
867 .data = &sysctl_vfs_cache_pressure,
868 .maxlen = sizeof(sysctl_vfs_cache_pressure),
869 .mode = 0644,
870 .proc_handler = &proc_dointvec,
871 .strategy = &sysctl_intvec,
872 .extra1 = &zero,
873 },
874 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
875 {
876 .ctl_name = VM_LEGACY_VA_LAYOUT,
877 .procname = "legacy_va_layout",
878 .data = &sysctl_legacy_va_layout,
879 .maxlen = sizeof(sysctl_legacy_va_layout),
880 .mode = 0644,
881 .proc_handler = &proc_dointvec,
882 .strategy = &sysctl_intvec,
883 .extra1 = &zero,
884 },
885 #endif
886 #ifdef CONFIG_SWAP
887 {
888 .ctl_name = VM_SWAP_TOKEN_TIMEOUT,
889 .procname = "swap_token_timeout",
890 .data = &swap_token_default_timeout,
891 .maxlen = sizeof(swap_token_default_timeout),
892 .mode = 0644,
893 .proc_handler = &proc_dointvec_jiffies,
894 .strategy = &sysctl_jiffies,
895 },
896 #endif
897 #ifdef CONFIG_NUMA
898 {
899 .ctl_name = VM_ZONE_RECLAIM_MODE,
900 .procname = "zone_reclaim_mode",
901 .data = &zone_reclaim_mode,
902 .maxlen = sizeof(zone_reclaim_mode),
903 .mode = 0644,
904 .proc_handler = &proc_dointvec,
905 .strategy = &sysctl_intvec,
906 .extra1 = &zero,
907 },
908 {
909 .ctl_name = VM_ZONE_RECLAIM_INTERVAL,
910 .procname = "zone_reclaim_interval",
911 .data = &zone_reclaim_interval,
912 .maxlen = sizeof(zone_reclaim_interval),
913 .mode = 0644,
914 .proc_handler = &proc_dointvec_jiffies,
915 .strategy = &sysctl_jiffies,
916 },
917 #endif
918 { .ctl_name = 0 }
919 };
920
921 static ctl_table proc_table[] = {
922 { .ctl_name = 0 }
923 };
924
925 static ctl_table fs_table[] = {
926 {
927 .ctl_name = FS_NRINODE,
928 .procname = "inode-nr",
929 .data = &inodes_stat,
930 .maxlen = 2*sizeof(int),
931 .mode = 0444,
932 .proc_handler = &proc_dointvec,
933 },
934 {
935 .ctl_name = FS_STATINODE,
936 .procname = "inode-state",
937 .data = &inodes_stat,
938 .maxlen = 7*sizeof(int),
939 .mode = 0444,
940 .proc_handler = &proc_dointvec,
941 },
942 {
943 .ctl_name = FS_NRFILE,
944 .procname = "file-nr",
945 .data = &files_stat,
946 .maxlen = 3*sizeof(int),
947 .mode = 0444,
948 .proc_handler = &proc_nr_files,
949 },
950 {
951 .ctl_name = FS_MAXFILE,
952 .procname = "file-max",
953 .data = &files_stat.max_files,
954 .maxlen = sizeof(int),
955 .mode = 0644,
956 .proc_handler = &proc_dointvec,
957 },
958 {
959 .ctl_name = FS_DENTRY,
960 .procname = "dentry-state",
961 .data = &dentry_stat,
962 .maxlen = 6*sizeof(int),
963 .mode = 0444,
964 .proc_handler = &proc_dointvec,
965 },
966 {
967 .ctl_name = FS_OVERFLOWUID,
968 .procname = "overflowuid",
969 .data = &fs_overflowuid,
970 .maxlen = sizeof(int),
971 .mode = 0644,
972 .proc_handler = &proc_dointvec_minmax,
973 .strategy = &sysctl_intvec,
974 .extra1 = &minolduid,
975 .extra2 = &maxolduid,
976 },
977 {
978 .ctl_name = FS_OVERFLOWGID,
979 .procname = "overflowgid",
980 .data = &fs_overflowgid,
981 .maxlen = sizeof(int),
982 .mode = 0644,
983 .proc_handler = &proc_dointvec_minmax,
984 .strategy = &sysctl_intvec,
985 .extra1 = &minolduid,
986 .extra2 = &maxolduid,
987 },
988 {
989 .ctl_name = FS_LEASES,
990 .procname = "leases-enable",
991 .data = &leases_enable,
992 .maxlen = sizeof(int),
993 .mode = 0644,
994 .proc_handler = &proc_dointvec,
995 },
996 #ifdef CONFIG_DNOTIFY
997 {
998 .ctl_name = FS_DIR_NOTIFY,
999 .procname = "dir-notify-enable",
1000 .data = &dir_notify_enable,
1001 .maxlen = sizeof(int),
1002 .mode = 0644,
1003 .proc_handler = &proc_dointvec,
1004 },
1005 #endif
1006 #ifdef CONFIG_MMU
1007 {
1008 .ctl_name = FS_LEASE_TIME,
1009 .procname = "lease-break-time",
1010 .data = &lease_break_time,
1011 .maxlen = sizeof(int),
1012 .mode = 0644,
1013 .proc_handler = &proc_dointvec,
1014 },
1015 {
1016 .ctl_name = FS_AIO_NR,
1017 .procname = "aio-nr",
1018 .data = &aio_nr,
1019 .maxlen = sizeof(aio_nr),
1020 .mode = 0444,
1021 .proc_handler = &proc_doulongvec_minmax,
1022 },
1023 {
1024 .ctl_name = FS_AIO_MAX_NR,
1025 .procname = "aio-max-nr",
1026 .data = &aio_max_nr,
1027 .maxlen = sizeof(aio_max_nr),
1028 .mode = 0644,
1029 .proc_handler = &proc_doulongvec_minmax,
1030 },
1031 #ifdef CONFIG_INOTIFY
1032 {
1033 .ctl_name = FS_INOTIFY,
1034 .procname = "inotify",
1035 .mode = 0555,
1036 .child = inotify_table,
1037 },
1038 #endif
1039 #endif
1040 {
1041 .ctl_name = KERN_SETUID_DUMPABLE,
1042 .procname = "suid_dumpable",
1043 .data = &suid_dumpable,
1044 .maxlen = sizeof(int),
1045 .mode = 0644,
1046 .proc_handler = &proc_dointvec,
1047 },
1048 { .ctl_name = 0 }
1049 };
1050
1051 static ctl_table debug_table[] = {
1052 { .ctl_name = 0 }
1053 };
1054
1055 static ctl_table dev_table[] = {
1056 { .ctl_name = 0 }
1057 };
1058
1059 extern void init_irq_proc (void);
1060
1061 static DEFINE_SPINLOCK(sysctl_lock);
1062
1063 /* called under sysctl_lock */
1064 static int use_table(struct ctl_table_header *p)
1065 {
1066 if (unlikely(p->unregistering))
1067 return 0;
1068 p->used++;
1069 return 1;
1070 }
1071
1072 /* called under sysctl_lock */
1073 static void unuse_table(struct ctl_table_header *p)
1074 {
1075 if (!--p->used)
1076 if (unlikely(p->unregistering))
1077 complete(p->unregistering);
1078 }
1079
1080 /* called under sysctl_lock, will reacquire if has to wait */
1081 static void start_unregistering(struct ctl_table_header *p)
1082 {
1083 /*
1084 * if p->used is 0, nobody will ever touch that entry again;
1085 * we'll eliminate all paths to it before dropping sysctl_lock
1086 */
1087 if (unlikely(p->used)) {
1088 struct completion wait;
1089 init_completion(&wait);
1090 p->unregistering = &wait;
1091 spin_unlock(&sysctl_lock);
1092 wait_for_completion(&wait);
1093 spin_lock(&sysctl_lock);
1094 }
1095 /*
1096 * do not remove from the list until nobody holds it; walking the
1097 * list in do_sysctl() relies on that.
1098 */
1099 list_del_init(&p->ctl_entry);
1100 }
1101
1102 void __init sysctl_init(void)
1103 {
1104 #ifdef CONFIG_PROC_FS
1105 register_proc_table(root_table, proc_sys_root, &root_table_header);
1106 init_irq_proc();
1107 #endif
1108 }
1109
1110 int do_sysctl(int __user *name, int nlen, void __user *oldval, size_t __user *oldlenp,
1111 void __user *newval, size_t newlen)
1112 {
1113 struct list_head *tmp;
1114 int error = -ENOTDIR;
1115
1116 if (nlen <= 0 || nlen >= CTL_MAXNAME)
1117 return -ENOTDIR;
1118 if (oldval) {
1119 int old_len;
1120 if (!oldlenp || get_user(old_len, oldlenp))
1121 return -EFAULT;
1122 }
1123 spin_lock(&sysctl_lock);
1124 tmp = &root_table_header.ctl_entry;
1125 do {
1126 struct ctl_table_header *head =
1127 list_entry(tmp, struct ctl_table_header, ctl_entry);
1128 void *context = NULL;
1129
1130 if (!use_table(head))
1131 continue;
1132
1133 spin_unlock(&sysctl_lock);
1134
1135 error = parse_table(name, nlen, oldval, oldlenp,
1136 newval, newlen, head->ctl_table,
1137 &context);
1138 kfree(context);
1139
1140 spin_lock(&sysctl_lock);
1141 unuse_table(head);
1142 if (error != -ENOTDIR)
1143 break;
1144 } while ((tmp = tmp->next) != &root_table_header.ctl_entry);
1145 spin_unlock(&sysctl_lock);
1146 return error;
1147 }
1148
1149 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
1150 {
1151 struct __sysctl_args tmp;
1152 int error;
1153
1154 if (copy_from_user(&tmp, args, sizeof(tmp)))
1155 return -EFAULT;
1156
1157 lock_kernel();
1158 error = do_sysctl(tmp.name, tmp.nlen, tmp.oldval, tmp.oldlenp,
1159 tmp.newval, tmp.newlen);
1160 unlock_kernel();
1161 return error;
1162 }
1163
1164 /*
1165 * ctl_perm does NOT grant the superuser all rights automatically, because
1166 * some sysctl variables are readonly even to root.
1167 */
1168
1169 static int test_perm(int mode, int op)
1170 {
1171 if (!current->euid)
1172 mode >>= 6;
1173 else if (in_egroup_p(0))
1174 mode >>= 3;
1175 if ((mode & op & 0007) == op)
1176 return 0;
1177 return -EACCES;
1178 }
1179
1180 static inline int ctl_perm(ctl_table *table, int op)
1181 {
1182 int error;
1183 error = security_sysctl(table, op);
1184 if (error)
1185 return error;
1186 return test_perm(table->mode, op);
1187 }
1188
1189 static int parse_table(int __user *name, int nlen,
1190 void __user *oldval, size_t __user *oldlenp,
1191 void __user *newval, size_t newlen,
1192 ctl_table *table, void **context)
1193 {
1194 int n;
1195 repeat:
1196 if (!nlen)
1197 return -ENOTDIR;
1198 if (get_user(n, name))
1199 return -EFAULT;
1200 for ( ; table->ctl_name; table++) {
1201 if (n == table->ctl_name || table->ctl_name == CTL_ANY) {
1202 int error;
1203 if (table->child) {
1204 if (ctl_perm(table, 001))
1205 return -EPERM;
1206 if (table->strategy) {
1207 error = table->strategy(
1208 table, name, nlen,
1209 oldval, oldlenp,
1210 newval, newlen, context);
1211 if (error)
1212 return error;
1213 }
1214 name++;
1215 nlen--;
1216 table = table->child;
1217 goto repeat;
1218 }
1219 error = do_sysctl_strategy(table, name, nlen,
1220 oldval, oldlenp,
1221 newval, newlen, context);
1222 return error;
1223 }
1224 }
1225 return -ENOTDIR;
1226 }
1227
1228 /* Perform the actual read/write of a sysctl table entry. */
1229 int do_sysctl_strategy (ctl_table *table,
1230 int __user *name, int nlen,
1231 void __user *oldval, size_t __user *oldlenp,
1232 void __user *newval, size_t newlen, void **context)
1233 {
1234 int op = 0, rc;
1235 size_t len;
1236
1237 if (oldval)
1238 op |= 004;
1239 if (newval)
1240 op |= 002;
1241 if (ctl_perm(table, op))
1242 return -EPERM;
1243
1244 if (table->strategy) {
1245 rc = table->strategy(table, name, nlen, oldval, oldlenp,
1246 newval, newlen, context);
1247 if (rc < 0)
1248 return rc;
1249 if (rc > 0)
1250 return 0;
1251 }
1252
1253 /* If there is no strategy routine, or if the strategy returns
1254 * zero, proceed with automatic r/w */
1255 if (table->data && table->maxlen) {
1256 if (oldval && oldlenp) {
1257 if (get_user(len, oldlenp))
1258 return -EFAULT;
1259 if (len) {
1260 if (len > table->maxlen)
1261 len = table->maxlen;
1262 if(copy_to_user(oldval, table->data, len))
1263 return -EFAULT;
1264 if(put_user(len, oldlenp))
1265 return -EFAULT;
1266 }
1267 }
1268 if (newval && newlen) {
1269 len = newlen;
1270 if (len > table->maxlen)
1271 len = table->maxlen;
1272 if(copy_from_user(table->data, newval, len))
1273 return -EFAULT;
1274 }
1275 }
1276 return 0;
1277 }
1278
1279 /**
1280 * register_sysctl_table - register a sysctl hierarchy
1281 * @table: the top-level table structure
1282 * @insert_at_head: whether the entry should be inserted in front or at the end
1283 *
1284 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1285 * array. An entry with a ctl_name of 0 terminates the table.
1286 *
1287 * The members of the &ctl_table structure are used as follows:
1288 *
1289 * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1290 * must be unique within that level of sysctl
1291 *
1292 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1293 * enter a sysctl file
1294 *
1295 * data - a pointer to data for use by proc_handler
1296 *
1297 * maxlen - the maximum size in bytes of the data
1298 *
1299 * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1300 *
1301 * child - a pointer to the child sysctl table if this entry is a directory, or
1302 * %NULL.
1303 *
1304 * proc_handler - the text handler routine (described below)
1305 *
1306 * strategy - the strategy routine (described below)
1307 *
1308 * de - for internal use by the sysctl routines
1309 *
1310 * extra1, extra2 - extra pointers usable by the proc handler routines
1311 *
1312 * Leaf nodes in the sysctl tree will be represented by a single file
1313 * under /proc; non-leaf nodes will be represented by directories.
1314 *
1315 * sysctl(2) can automatically manage read and write requests through
1316 * the sysctl table. The data and maxlen fields of the ctl_table
1317 * struct enable minimal validation of the values being written to be
1318 * performed, and the mode field allows minimal authentication.
1319 *
1320 * More sophisticated management can be enabled by the provision of a
1321 * strategy routine with the table entry. This will be called before
1322 * any automatic read or write of the data is performed.
1323 *
1324 * The strategy routine may return
1325 *
1326 * < 0 - Error occurred (error is passed to user process)
1327 *
1328 * 0 - OK - proceed with automatic read or write.
1329 *
1330 * > 0 - OK - read or write has been done by the strategy routine, so
1331 * return immediately.
1332 *
1333 * There must be a proc_handler routine for any terminal nodes
1334 * mirrored under /proc/sys (non-terminals are handled by a built-in
1335 * directory handler). Several default handlers are available to
1336 * cover common cases -
1337 *
1338 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1339 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1340 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1341 *
1342 * It is the handler's job to read the input buffer from user memory
1343 * and process it. The handler should return 0 on success.
1344 *
1345 * This routine returns %NULL on a failure to register, and a pointer
1346 * to the table header on success.
1347 */
1348 struct ctl_table_header *register_sysctl_table(ctl_table * table,
1349 int insert_at_head)
1350 {
1351 struct ctl_table_header *tmp;
1352 tmp = kmalloc(sizeof(struct ctl_table_header), GFP_KERNEL);
1353 if (!tmp)
1354 return NULL;
1355 tmp->ctl_table = table;
1356 INIT_LIST_HEAD(&tmp->ctl_entry);
1357 tmp->used = 0;
1358 tmp->unregistering = NULL;
1359 spin_lock(&sysctl_lock);
1360 if (insert_at_head)
1361 list_add(&tmp->ctl_entry, &root_table_header.ctl_entry);
1362 else
1363 list_add_tail(&tmp->ctl_entry, &root_table_header.ctl_entry);
1364 spin_unlock(&sysctl_lock);
1365 #ifdef CONFIG_PROC_FS
1366 register_proc_table(table, proc_sys_root, tmp);
1367 #endif
1368 return tmp;
1369 }
1370
1371 /**
1372 * unregister_sysctl_table - unregister a sysctl table hierarchy
1373 * @header: the header returned from register_sysctl_table
1374 *
1375 * Unregisters the sysctl table and all children. proc entries may not
1376 * actually be removed until they are no longer used by anyone.
1377 */
1378 void unregister_sysctl_table(struct ctl_table_header * header)
1379 {
1380 might_sleep();
1381 spin_lock(&sysctl_lock);
1382 start_unregistering(header);
1383 #ifdef CONFIG_PROC_FS
1384 unregister_proc_table(header->ctl_table, proc_sys_root);
1385 #endif
1386 spin_unlock(&sysctl_lock);
1387 kfree(header);
1388 }
1389
1390 /*
1391 * /proc/sys support
1392 */
1393
1394 #ifdef CONFIG_PROC_FS
1395
1396 /* Scan the sysctl entries in table and add them all into /proc */
1397 static void register_proc_table(ctl_table * table, struct proc_dir_entry *root, void *set)
1398 {
1399 struct proc_dir_entry *de;
1400 int len;
1401 mode_t mode;
1402
1403 for (; table->ctl_name; table++) {
1404 /* Can't do anything without a proc name. */
1405 if (!table->procname)
1406 continue;
1407 /* Maybe we can't do anything with it... */
1408 if (!table->proc_handler && !table->child) {
1409 printk(KERN_WARNING "SYSCTL: Can't register %s\n",
1410 table->procname);
1411 continue;
1412 }
1413
1414 len = strlen(table->procname);
1415 mode = table->mode;
1416
1417 de = NULL;
1418 if (table->proc_handler)
1419 mode |= S_IFREG;
1420 else {
1421 mode |= S_IFDIR;
1422 for (de = root->subdir; de; de = de->next) {
1423 if (proc_match(len, table->procname, de))
1424 break;
1425 }
1426 /* If the subdir exists already, de is non-NULL */
1427 }
1428
1429 if (!de) {
1430 de = create_proc_entry(table->procname, mode, root);
1431 if (!de)
1432 continue;
1433 de->set = set;
1434 de->data = (void *) table;
1435 if (table->proc_handler)
1436 de->proc_fops = &proc_sys_file_operations;
1437 }
1438 table->de = de;
1439 if (de->mode & S_IFDIR)
1440 register_proc_table(table->child, de, set);
1441 }
1442 }
1443
1444 /*
1445 * Unregister a /proc sysctl table and any subdirectories.
1446 */
1447 static void unregister_proc_table(ctl_table * table, struct proc_dir_entry *root)
1448 {
1449 struct proc_dir_entry *de;
1450 for (; table->ctl_name; table++) {
1451 if (!(de = table->de))
1452 continue;
1453 if (de->mode & S_IFDIR) {
1454 if (!table->child) {
1455 printk (KERN_ALERT "Help - malformed sysctl tree on free\n");
1456 continue;
1457 }
1458 unregister_proc_table(table->child, de);
1459
1460 /* Don't unregister directories which still have entries.. */
1461 if (de->subdir)
1462 continue;
1463 }
1464
1465 /*
1466 * In any case, mark the entry as goner; we'll keep it
1467 * around if it's busy, but we'll know to do nothing with
1468 * its fields. We are under sysctl_lock here.
1469 */
1470 de->data = NULL;
1471
1472 /* Don't unregister proc entries that are still being used.. */
1473 if (atomic_read(&de->count))
1474 continue;
1475
1476 table->de = NULL;
1477 remove_proc_entry(table->procname, root);
1478 }
1479 }
1480
1481 static ssize_t do_rw_proc(int write, struct file * file, char __user * buf,
1482 size_t count, loff_t *ppos)
1483 {
1484 int op;
1485 struct proc_dir_entry *de = PDE(file->f_dentry->d_inode);
1486 struct ctl_table *table;
1487 size_t res;
1488 ssize_t error = -ENOTDIR;
1489
1490 spin_lock(&sysctl_lock);
1491 if (de && de->data && use_table(de->set)) {
1492 /*
1493 * at that point we know that sysctl was not unregistered
1494 * and won't be until we finish
1495 */
1496 spin_unlock(&sysctl_lock);
1497 table = (struct ctl_table *) de->data;
1498 if (!table || !table->proc_handler)
1499 goto out;
1500 error = -EPERM;
1501 op = (write ? 002 : 004);
1502 if (ctl_perm(table, op))
1503 goto out;
1504
1505 /* careful: calling conventions are nasty here */
1506 res = count;
1507 error = (*table->proc_handler)(table, write, file,
1508 buf, &res, ppos);
1509 if (!error)
1510 error = res;
1511 out:
1512 spin_lock(&sysctl_lock);
1513 unuse_table(de->set);
1514 }
1515 spin_unlock(&sysctl_lock);
1516 return error;
1517 }
1518
1519 static int proc_opensys(struct inode *inode, struct file *file)
1520 {
1521 if (file->f_mode & FMODE_WRITE) {
1522 /*
1523 * sysctl entries that are not writable,
1524 * are _NOT_ writable, capabilities or not.
1525 */
1526 if (!(inode->i_mode & S_IWUSR))
1527 return -EPERM;
1528 }
1529
1530 return 0;
1531 }
1532
1533 static ssize_t proc_readsys(struct file * file, char __user * buf,
1534 size_t count, loff_t *ppos)
1535 {
1536 return do_rw_proc(0, file, buf, count, ppos);
1537 }
1538
1539 static ssize_t proc_writesys(struct file * file, const char __user * buf,
1540 size_t count, loff_t *ppos)
1541 {
1542 return do_rw_proc(1, file, (char __user *) buf, count, ppos);
1543 }
1544
1545 /**
1546 * proc_dostring - read a string sysctl
1547 * @table: the sysctl table
1548 * @write: %TRUE if this is a write to the sysctl file
1549 * @filp: the file structure
1550 * @buffer: the user buffer
1551 * @lenp: the size of the user buffer
1552 * @ppos: file position
1553 *
1554 * Reads/writes a string from/to the user buffer. If the kernel
1555 * buffer provided is not large enough to hold the string, the
1556 * string is truncated. The copied string is %NULL-terminated.
1557 * If the string is being read by the user process, it is copied
1558 * and a newline '\n' is added. It is truncated if the buffer is
1559 * not large enough.
1560 *
1561 * Returns 0 on success.
1562 */
1563 int proc_dostring(ctl_table *table, int write, struct file *filp,
1564 void __user *buffer, size_t *lenp, loff_t *ppos)
1565 {
1566 size_t len;
1567 char __user *p;
1568 char c;
1569
1570 if (!table->data || !table->maxlen || !*lenp ||
1571 (*ppos && !write)) {
1572 *lenp = 0;
1573 return 0;
1574 }
1575
1576 if (write) {
1577 len = 0;
1578 p = buffer;
1579 while (len < *lenp) {
1580 if (get_user(c, p++))
1581 return -EFAULT;
1582 if (c == 0 || c == '\n')
1583 break;
1584 len++;
1585 }
1586 if (len >= table->maxlen)
1587 len = table->maxlen-1;
1588 if(copy_from_user(table->data, buffer, len))
1589 return -EFAULT;
1590 ((char *) table->data)[len] = 0;
1591 *ppos += *lenp;
1592 } else {
1593 len = strlen(table->data);
1594 if (len > table->maxlen)
1595 len = table->maxlen;
1596 if (len > *lenp)
1597 len = *lenp;
1598 if (len)
1599 if(copy_to_user(buffer, table->data, len))
1600 return -EFAULT;
1601 if (len < *lenp) {
1602 if(put_user('\n', ((char __user *) buffer) + len))
1603 return -EFAULT;
1604 len++;
1605 }
1606 *lenp = len;
1607 *ppos += len;
1608 }
1609 return 0;
1610 }
1611
1612 /*
1613 * Special case of dostring for the UTS structure. This has locks
1614 * to observe. Should this be in kernel/sys.c ????
1615 */
1616
1617 static int proc_doutsstring(ctl_table *table, int write, struct file *filp,
1618 void __user *buffer, size_t *lenp, loff_t *ppos)
1619 {
1620 int r;
1621
1622 if (!write) {
1623 down_read(&uts_sem);
1624 r=proc_dostring(table,0,filp,buffer,lenp, ppos);
1625 up_read(&uts_sem);
1626 } else {
1627 down_write(&uts_sem);
1628 r=proc_dostring(table,1,filp,buffer,lenp, ppos);
1629 up_write(&uts_sem);
1630 }
1631 return r;
1632 }
1633
1634 static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp,
1635 int *valp,
1636 int write, void *data)
1637 {
1638 if (write) {
1639 *valp = *negp ? -*lvalp : *lvalp;
1640 } else {
1641 int val = *valp;
1642 if (val < 0) {
1643 *negp = -1;
1644 *lvalp = (unsigned long)-val;
1645 } else {
1646 *negp = 0;
1647 *lvalp = (unsigned long)val;
1648 }
1649 }
1650 return 0;
1651 }
1652
1653 static int do_proc_dointvec(ctl_table *table, int write, struct file *filp,
1654 void __user *buffer, size_t *lenp, loff_t *ppos,
1655 int (*conv)(int *negp, unsigned long *lvalp, int *valp,
1656 int write, void *data),
1657 void *data)
1658 {
1659 #define TMPBUFLEN 21
1660 int *i, vleft, first=1, neg, val;
1661 unsigned long lval;
1662 size_t left, len;
1663
1664 char buf[TMPBUFLEN], *p;
1665 char __user *s = buffer;
1666
1667 if (!table->data || !table->maxlen || !*lenp ||
1668 (*ppos && !write)) {
1669 *lenp = 0;
1670 return 0;
1671 }
1672
1673 i = (int *) table->data;
1674 vleft = table->maxlen / sizeof(*i);
1675 left = *lenp;
1676
1677 if (!conv)
1678 conv = do_proc_dointvec_conv;
1679
1680 for (; left && vleft--; i++, first=0) {
1681 if (write) {
1682 while (left) {
1683 char c;
1684 if (get_user(c, s))
1685 return -EFAULT;
1686 if (!isspace(c))
1687 break;
1688 left--;
1689 s++;
1690 }
1691 if (!left)
1692 break;
1693 neg = 0;
1694 len = left;
1695 if (len > sizeof(buf) - 1)
1696 len = sizeof(buf) - 1;
1697 if (copy_from_user(buf, s, len))
1698 return -EFAULT;
1699 buf[len] = 0;
1700 p = buf;
1701 if (*p == '-' && left > 1) {
1702 neg = 1;
1703 left--, p++;
1704 }
1705 if (*p < '0' || *p > '9')
1706 break;
1707
1708 lval = simple_strtoul(p, &p, 0);
1709
1710 len = p-buf;
1711 if ((len < left) && *p && !isspace(*p))
1712 break;
1713 if (neg)
1714 val = -val;
1715 s += len;
1716 left -= len;
1717
1718 if (conv(&neg, &lval, i, 1, data))
1719 break;
1720 } else {
1721 p = buf;
1722 if (!first)
1723 *p++ = '\t';
1724
1725 if (conv(&neg, &lval, i, 0, data))
1726 break;
1727
1728 sprintf(p, "%s%lu", neg ? "-" : "", lval);
1729 len = strlen(buf);
1730 if (len > left)
1731 len = left;
1732 if(copy_to_user(s, buf, len))
1733 return -EFAULT;
1734 left -= len;
1735 s += len;
1736 }
1737 }
1738
1739 if (!write && !first && left) {
1740 if(put_user('\n', s))
1741 return -EFAULT;
1742 left--, s++;
1743 }
1744 if (write) {
1745 while (left) {
1746 char c;
1747 if (get_user(c, s++))
1748 return -EFAULT;
1749 if (!isspace(c))
1750 break;
1751 left--;
1752 }
1753 }
1754 if (write && first)
1755 return -EINVAL;
1756 *lenp -= left;
1757 *ppos += *lenp;
1758 return 0;
1759 #undef TMPBUFLEN
1760 }
1761
1762 /**
1763 * proc_dointvec - read a vector of integers
1764 * @table: the sysctl table
1765 * @write: %TRUE if this is a write to the sysctl file
1766 * @filp: the file structure
1767 * @buffer: the user buffer
1768 * @lenp: the size of the user buffer
1769 * @ppos: file position
1770 *
1771 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1772 * values from/to the user buffer, treated as an ASCII string.
1773 *
1774 * Returns 0 on success.
1775 */
1776 int proc_dointvec(ctl_table *table, int write, struct file *filp,
1777 void __user *buffer, size_t *lenp, loff_t *ppos)
1778 {
1779 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
1780 NULL,NULL);
1781 }
1782
1783 #define OP_SET 0
1784 #define OP_AND 1
1785 #define OP_OR 2
1786 #define OP_MAX 3
1787 #define OP_MIN 4
1788
1789 static int do_proc_dointvec_bset_conv(int *negp, unsigned long *lvalp,
1790 int *valp,
1791 int write, void *data)
1792 {
1793 int op = *(int *)data;
1794 if (write) {
1795 int val = *negp ? -*lvalp : *lvalp;
1796 switch(op) {
1797 case OP_SET: *valp = val; break;
1798 case OP_AND: *valp &= val; break;
1799 case OP_OR: *valp |= val; break;
1800 case OP_MAX: if(*valp < val)
1801 *valp = val;
1802 break;
1803 case OP_MIN: if(*valp > val)
1804 *valp = val;
1805 break;
1806 }
1807 } else {
1808 int val = *valp;
1809 if (val < 0) {
1810 *negp = -1;
1811 *lvalp = (unsigned long)-val;
1812 } else {
1813 *negp = 0;
1814 *lvalp = (unsigned long)val;
1815 }
1816 }
1817 return 0;
1818 }
1819
1820 /*
1821 * init may raise the set.
1822 */
1823
1824 int proc_dointvec_bset(ctl_table *table, int write, struct file *filp,
1825 void __user *buffer, size_t *lenp, loff_t *ppos)
1826 {
1827 int op;
1828
1829 if (!capable(CAP_SYS_MODULE)) {
1830 return -EPERM;
1831 }
1832
1833 op = (current->pid == 1) ? OP_SET : OP_AND;
1834 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
1835 do_proc_dointvec_bset_conv,&op);
1836 }
1837
1838 struct do_proc_dointvec_minmax_conv_param {
1839 int *min;
1840 int *max;
1841 };
1842
1843 static int do_proc_dointvec_minmax_conv(int *negp, unsigned long *lvalp,
1844 int *valp,
1845 int write, void *data)
1846 {
1847 struct do_proc_dointvec_minmax_conv_param *param = data;
1848 if (write) {
1849 int val = *negp ? -*lvalp : *lvalp;
1850 if ((param->min && *param->min > val) ||
1851 (param->max && *param->max < val))
1852 return -EINVAL;
1853 *valp = val;
1854 } else {
1855 int val = *valp;
1856 if (val < 0) {
1857 *negp = -1;
1858 *lvalp = (unsigned long)-val;
1859 } else {
1860 *negp = 0;
1861 *lvalp = (unsigned long)val;
1862 }
1863 }
1864 return 0;
1865 }
1866
1867 /**
1868 * proc_dointvec_minmax - read a vector of integers with min/max values
1869 * @table: the sysctl table
1870 * @write: %TRUE if this is a write to the sysctl file
1871 * @filp: the file structure
1872 * @buffer: the user buffer
1873 * @lenp: the size of the user buffer
1874 * @ppos: file position
1875 *
1876 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1877 * values from/to the user buffer, treated as an ASCII string.
1878 *
1879 * This routine will ensure the values are within the range specified by
1880 * table->extra1 (min) and table->extra2 (max).
1881 *
1882 * Returns 0 on success.
1883 */
1884 int proc_dointvec_minmax(ctl_table *table, int write, struct file *filp,
1885 void __user *buffer, size_t *lenp, loff_t *ppos)
1886 {
1887 struct do_proc_dointvec_minmax_conv_param param = {
1888 .min = (int *) table->extra1,
1889 .max = (int *) table->extra2,
1890 };
1891 return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
1892 do_proc_dointvec_minmax_conv, &param);
1893 }
1894
1895 static int do_proc_doulongvec_minmax(ctl_table *table, int write,
1896 struct file *filp,
1897 void __user *buffer,
1898 size_t *lenp, loff_t *ppos,
1899 unsigned long convmul,
1900 unsigned long convdiv)
1901 {
1902 #define TMPBUFLEN 21
1903 unsigned long *i, *min, *max, val;
1904 int vleft, first=1, neg;
1905 size_t len, left;
1906 char buf[TMPBUFLEN], *p;
1907 char __user *s = buffer;
1908
1909 if (!table->data || !table->maxlen || !*lenp ||
1910 (*ppos && !write)) {
1911 *lenp = 0;
1912 return 0;
1913 }
1914
1915 i = (unsigned long *) table->data;
1916 min = (unsigned long *) table->extra1;
1917 max = (unsigned long *) table->extra2;
1918 vleft = table->maxlen / sizeof(unsigned long);
1919 left = *lenp;
1920
1921 for (; left && vleft--; i++, min++, max++, first=0) {
1922 if (write) {
1923 while (left) {
1924 char c;
1925 if (get_user(c, s))
1926 return -EFAULT;
1927 if (!isspace(c))
1928 break;
1929 left--;
1930 s++;
1931 }
1932 if (!left)
1933 break;
1934 neg = 0;
1935 len = left;
1936 if (len > TMPBUFLEN-1)
1937 len = TMPBUFLEN-1;
1938 if (copy_from_user(buf, s, len))
1939 return -EFAULT;
1940 buf[len] = 0;
1941 p = buf;
1942 if (*p == '-' && left > 1) {
1943 neg = 1;
1944 left--, p++;
1945 }
1946 if (*p < '0' || *p > '9')
1947 break;
1948 val = simple_strtoul(p, &p, 0) * convmul / convdiv ;
1949 len = p-buf;
1950 if ((len < left) && *p && !isspace(*p))
1951 break;
1952 if (neg)
1953 val = -val;
1954 s += len;
1955 left -= len;
1956
1957 if(neg)
1958 continue;
1959 if ((min && val < *min) || (max && val > *max))
1960 continue;
1961 *i = val;
1962 } else {
1963 p = buf;
1964 if (!first)
1965 *p++ = '\t';
1966 sprintf(p, "%lu", convdiv * (*i) / convmul);
1967 len = strlen(buf);
1968 if (len > left)
1969 len = left;
1970 if(copy_to_user(s, buf, len))
1971 return -EFAULT;
1972 left -= len;
1973 s += len;
1974 }
1975 }
1976
1977 if (!write && !first && left) {
1978 if(put_user('\n', s))
1979 return -EFAULT;
1980 left--, s++;
1981 }
1982 if (write) {
1983 while (left) {
1984 char c;
1985 if (get_user(c, s++))
1986 return -EFAULT;
1987 if (!isspace(c))
1988 break;
1989 left--;
1990 }
1991 }
1992 if (write && first)
1993 return -EINVAL;
1994 *lenp -= left;
1995 *ppos += *lenp;
1996 return 0;
1997 #undef TMPBUFLEN
1998 }
1999
2000 /**
2001 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2002 * @table: the sysctl table
2003 * @write: %TRUE if this is a write to the sysctl file
2004 * @filp: the file structure
2005 * @buffer: the user buffer
2006 * @lenp: the size of the user buffer
2007 * @ppos: file position
2008 *
2009 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2010 * values from/to the user buffer, treated as an ASCII string.
2011 *
2012 * This routine will ensure the values are within the range specified by
2013 * table->extra1 (min) and table->extra2 (max).
2014 *
2015 * Returns 0 on success.
2016 */
2017 int proc_doulongvec_minmax(ctl_table *table, int write, struct file *filp,
2018 void __user *buffer, size_t *lenp, loff_t *ppos)
2019 {
2020 return do_proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos, 1l, 1l);
2021 }
2022
2023 /**
2024 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2025 * @table: the sysctl table
2026 * @write: %TRUE if this is a write to the sysctl file
2027 * @filp: the file structure
2028 * @buffer: the user buffer
2029 * @lenp: the size of the user buffer
2030 * @ppos: file position
2031 *
2032 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2033 * values from/to the user buffer, treated as an ASCII string. The values
2034 * are treated as milliseconds, and converted to jiffies when they are stored.
2035 *
2036 * This routine will ensure the values are within the range specified by
2037 * table->extra1 (min) and table->extra2 (max).
2038 *
2039 * Returns 0 on success.
2040 */
2041 int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int write,
2042 struct file *filp,
2043 void __user *buffer,
2044 size_t *lenp, loff_t *ppos)
2045 {
2046 return do_proc_doulongvec_minmax(table, write, filp, buffer,
2047 lenp, ppos, HZ, 1000l);
2048 }
2049
2050
2051 static int do_proc_dointvec_jiffies_conv(int *negp, unsigned long *lvalp,
2052 int *valp,
2053 int write, void *data)
2054 {
2055 if (write) {
2056 if (*lvalp > LONG_MAX / HZ)
2057 return 1;
2058 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2059 } else {
2060 int val = *valp;
2061 unsigned long lval;
2062 if (val < 0) {
2063 *negp = -1;
2064 lval = (unsigned long)-val;
2065 } else {
2066 *negp = 0;
2067 lval = (unsigned long)val;
2068 }
2069 *lvalp = lval / HZ;
2070 }
2071 return 0;
2072 }
2073
2074 static int do_proc_dointvec_userhz_jiffies_conv(int *negp, unsigned long *lvalp,
2075 int *valp,
2076 int write, void *data)
2077 {
2078 if (write) {
2079 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2080 return 1;
2081 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2082 } else {
2083 int val = *valp;
2084 unsigned long lval;
2085 if (val < 0) {
2086 *negp = -1;
2087 lval = (unsigned long)-val;
2088 } else {
2089 *negp = 0;
2090 lval = (unsigned long)val;
2091 }
2092 *lvalp = jiffies_to_clock_t(lval);
2093 }
2094 return 0;
2095 }
2096
2097 static int do_proc_dointvec_ms_jiffies_conv(int *negp, unsigned long *lvalp,
2098 int *valp,
2099 int write, void *data)
2100 {
2101 if (write) {
2102 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2103 } else {
2104 int val = *valp;
2105 unsigned long lval;
2106 if (val < 0) {
2107 *negp = -1;
2108 lval = (unsigned long)-val;
2109 } else {
2110 *negp = 0;
2111 lval = (unsigned long)val;
2112 }
2113 *lvalp = jiffies_to_msecs(lval);
2114 }
2115 return 0;
2116 }
2117
2118 /**
2119 * proc_dointvec_jiffies - read a vector of integers as seconds
2120 * @table: the sysctl table
2121 * @write: %TRUE if this is a write to the sysctl file
2122 * @filp: the file structure
2123 * @buffer: the user buffer
2124 * @lenp: the size of the user buffer
2125 * @ppos: file position
2126 *
2127 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2128 * values from/to the user buffer, treated as an ASCII string.
2129 * The values read are assumed to be in seconds, and are converted into
2130 * jiffies.
2131 *
2132 * Returns 0 on success.
2133 */
2134 int proc_dointvec_jiffies(ctl_table *table, int write, struct file *filp,
2135 void __user *buffer, size_t *lenp, loff_t *ppos)
2136 {
2137 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2138 do_proc_dointvec_jiffies_conv,NULL);
2139 }
2140
2141 /**
2142 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2143 * @table: the sysctl table
2144 * @write: %TRUE if this is a write to the sysctl file
2145 * @filp: the file structure
2146 * @buffer: the user buffer
2147 * @lenp: the size of the user buffer
2148 * @ppos: pointer to the file position
2149 *
2150 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2151 * values from/to the user buffer, treated as an ASCII string.
2152 * The values read are assumed to be in 1/USER_HZ seconds, and
2153 * are converted into jiffies.
2154 *
2155 * Returns 0 on success.
2156 */
2157 int proc_dointvec_userhz_jiffies(ctl_table *table, int write, struct file *filp,
2158 void __user *buffer, size_t *lenp, loff_t *ppos)
2159 {
2160 return do_proc_dointvec(table,write,filp,buffer,lenp,ppos,
2161 do_proc_dointvec_userhz_jiffies_conv,NULL);
2162 }
2163
2164 /**
2165 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2166 * @table: the sysctl table
2167 * @write: %TRUE if this is a write to the sysctl file
2168 * @filp: the file structure
2169 * @buffer: the user buffer
2170 * @lenp: the size of the user buffer
2171 * @ppos: file position
2172 * @ppos: the current position in the file
2173 *
2174 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2175 * values from/to the user buffer, treated as an ASCII string.
2176 * The values read are assumed to be in 1/1000 seconds, and
2177 * are converted into jiffies.
2178 *
2179 * Returns 0 on success.
2180 */
2181 int proc_dointvec_ms_jiffies(ctl_table *table, int write, struct file *filp,
2182 void __user *buffer, size_t *lenp, loff_t *ppos)
2183 {
2184 return do_proc_dointvec(table, write, filp, buffer, lenp, ppos,
2185 do_proc_dointvec_ms_jiffies_conv, NULL);
2186 }
2187
2188 #else /* CONFIG_PROC_FS */
2189
2190 int proc_dostring(ctl_table *table, int write, struct file *filp,
2191 void __user *buffer, size_t *lenp, loff_t *ppos)
2192 {
2193 return -ENOSYS;
2194 }
2195
2196 static int proc_doutsstring(ctl_table *table, int write, struct file *filp,
2197 void __user *buffer, size_t *lenp, loff_t *ppos)
2198 {
2199 return -ENOSYS;
2200 }
2201
2202 int proc_dointvec(ctl_table *table, int write, struct file *filp,
2203 void __user *buffer, size_t *lenp, loff_t *ppos)
2204 {
2205 return -ENOSYS;
2206 }
2207
2208 int proc_dointvec_bset(ctl_table *table, int write, struct file *filp,
2209 void __user *buffer, size_t *lenp, loff_t *ppos)
2210 {
2211 return -ENOSYS;
2212 }
2213
2214 int proc_dointvec_minmax(ctl_table *table, int write, struct file *filp,
2215 void __user *buffer, size_t *lenp, loff_t *ppos)
2216 {
2217 return -ENOSYS;
2218 }
2219
2220 int proc_dointvec_jiffies(ctl_table *table, int write, struct file *filp,
2221 void __user *buffer, size_t *lenp, loff_t *ppos)
2222 {
2223 return -ENOSYS;
2224 }
2225
2226 int proc_dointvec_userhz_jiffies(ctl_table *table, int write, struct file *filp,
2227 void __user *buffer, size_t *lenp, loff_t *ppos)
2228 {
2229 return -ENOSYS;
2230 }
2231
2232 int proc_dointvec_ms_jiffies(ctl_table *table, int write, struct file *filp,
2233 void __user *buffer, size_t *lenp, loff_t *ppos)
2234 {
2235 return -ENOSYS;
2236 }
2237
2238 int proc_doulongvec_minmax(ctl_table *table, int write, struct file *filp,
2239 void __user *buffer, size_t *lenp, loff_t *ppos)
2240 {
2241 return -ENOSYS;
2242 }
2243
2244 int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int write,
2245 struct file *filp,
2246 void __user *buffer,
2247 size_t *lenp, loff_t *ppos)
2248 {
2249 return -ENOSYS;
2250 }
2251
2252
2253 #endif /* CONFIG_PROC_FS */
2254
2255
2256 /*
2257 * General sysctl support routines
2258 */
2259
2260 /* The generic string strategy routine: */
2261 int sysctl_string(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 if (!table->data || !table->maxlen)
2266 return -ENOTDIR;
2267
2268 if (oldval && oldlenp) {
2269 size_t bufsize;
2270 if (get_user(bufsize, oldlenp))
2271 return -EFAULT;
2272 if (bufsize) {
2273 size_t len = strlen(table->data), copied;
2274
2275 /* This shouldn't trigger for a well-formed sysctl */
2276 if (len > table->maxlen)
2277 len = table->maxlen;
2278
2279 /* Copy up to a max of bufsize-1 bytes of the string */
2280 copied = (len >= bufsize) ? bufsize - 1 : len;
2281
2282 if (copy_to_user(oldval, table->data, copied) ||
2283 put_user(0, (char __user *)(oldval + copied)))
2284 return -EFAULT;
2285 if (put_user(len, oldlenp))
2286 return -EFAULT;
2287 }
2288 }
2289 if (newval && newlen) {
2290 size_t len = newlen;
2291 if (len > table->maxlen)
2292 len = table->maxlen;
2293 if(copy_from_user(table->data, newval, len))
2294 return -EFAULT;
2295 if (len == table->maxlen)
2296 len--;
2297 ((char *) table->data)[len] = 0;
2298 }
2299 return 1;
2300 }
2301
2302 /*
2303 * This function makes sure that all of the integers in the vector
2304 * are between the minimum and maximum values given in the arrays
2305 * table->extra1 and table->extra2, respectively.
2306 */
2307 int sysctl_intvec(ctl_table *table, int __user *name, int nlen,
2308 void __user *oldval, size_t __user *oldlenp,
2309 void __user *newval, size_t newlen, void **context)
2310 {
2311
2312 if (newval && newlen) {
2313 int __user *vec = (int __user *) newval;
2314 int *min = (int *) table->extra1;
2315 int *max = (int *) table->extra2;
2316 size_t length;
2317 int i;
2318
2319 if (newlen % sizeof(int) != 0)
2320 return -EINVAL;
2321
2322 if (!table->extra1 && !table->extra2)
2323 return 0;
2324
2325 if (newlen > table->maxlen)
2326 newlen = table->maxlen;
2327 length = newlen / sizeof(int);
2328
2329 for (i = 0; i < length; i++) {
2330 int value;
2331 if (get_user(value, vec + i))
2332 return -EFAULT;
2333 if (min && value < min[i])
2334 return -EINVAL;
2335 if (max && value > max[i])
2336 return -EINVAL;
2337 }
2338 }
2339 return 0;
2340 }
2341
2342 /* Strategy function to convert jiffies to seconds */
2343 int sysctl_jiffies(ctl_table *table, int __user *name, int nlen,
2344 void __user *oldval, size_t __user *oldlenp,
2345 void __user *newval, size_t newlen, void **context)
2346 {
2347 if (oldval) {
2348 size_t olen;
2349 if (oldlenp) {
2350 if (get_user(olen, oldlenp))
2351 return -EFAULT;
2352 if (olen!=sizeof(int))
2353 return -EINVAL;
2354 }
2355 if (put_user(*(int *)(table->data)/HZ, (int __user *)oldval) ||
2356 (oldlenp && put_user(sizeof(int),oldlenp)))
2357 return -EFAULT;
2358 }
2359 if (newval && newlen) {
2360 int new;
2361 if (newlen != sizeof(int))
2362 return -EINVAL;
2363 if (get_user(new, (int __user *)newval))
2364 return -EFAULT;
2365 *(int *)(table->data) = new*HZ;
2366 }
2367 return 1;
2368 }
2369
2370 /* Strategy function to convert jiffies to seconds */
2371 int sysctl_ms_jiffies(ctl_table *table, int __user *name, int nlen,
2372 void __user *oldval, size_t __user *oldlenp,
2373 void __user *newval, size_t newlen, void **context)
2374 {
2375 if (oldval) {
2376 size_t olen;
2377 if (oldlenp) {
2378 if (get_user(olen, oldlenp))
2379 return -EFAULT;
2380 if (olen!=sizeof(int))
2381 return -EINVAL;
2382 }
2383 if (put_user(jiffies_to_msecs(*(int *)(table->data)), (int __user *)oldval) ||
2384 (oldlenp && put_user(sizeof(int),oldlenp)))
2385 return -EFAULT;
2386 }
2387 if (newval && newlen) {
2388 int new;
2389 if (newlen != sizeof(int))
2390 return -EINVAL;
2391 if (get_user(new, (int __user *)newval))
2392 return -EFAULT;
2393 *(int *)(table->data) = msecs_to_jiffies(new);
2394 }
2395 return 1;
2396 }
2397
2398 #else /* CONFIG_SYSCTL */
2399
2400
2401 asmlinkage long sys_sysctl(struct __sysctl_args __user *args)
2402 {
2403 return -ENOSYS;
2404 }
2405
2406 int sysctl_string(ctl_table *table, int __user *name, int nlen,
2407 void __user *oldval, size_t __user *oldlenp,
2408 void __user *newval, size_t newlen, void **context)
2409 {
2410 return -ENOSYS;
2411 }
2412
2413 int sysctl_intvec(ctl_table *table, int __user *name, int nlen,
2414 void __user *oldval, size_t __user *oldlenp,
2415 void __user *newval, size_t newlen, void **context)
2416 {
2417 return -ENOSYS;
2418 }
2419
2420 int sysctl_jiffies(ctl_table *table, int __user *name, int nlen,
2421 void __user *oldval, size_t __user *oldlenp,
2422 void __user *newval, size_t newlen, void **context)
2423 {
2424 return -ENOSYS;
2425 }
2426
2427 int sysctl_ms_jiffies(ctl_table *table, int __user *name, int nlen,
2428 void __user *oldval, size_t __user *oldlenp,
2429 void __user *newval, size_t newlen, void **context)
2430 {
2431 return -ENOSYS;
2432 }
2433
2434 int proc_dostring(ctl_table *table, int write, struct file *filp,
2435 void __user *buffer, size_t *lenp, loff_t *ppos)
2436 {
2437 return -ENOSYS;
2438 }
2439
2440 int proc_dointvec(ctl_table *table, int write, struct file *filp,
2441 void __user *buffer, size_t *lenp, loff_t *ppos)
2442 {
2443 return -ENOSYS;
2444 }
2445
2446 int proc_dointvec_bset(ctl_table *table, int write, struct file *filp,
2447 void __user *buffer, size_t *lenp, loff_t *ppos)
2448 {
2449 return -ENOSYS;
2450 }
2451
2452 int proc_dointvec_minmax(ctl_table *table, int write, struct file *filp,
2453 void __user *buffer, size_t *lenp, loff_t *ppos)
2454 {
2455 return -ENOSYS;
2456 }
2457
2458 int proc_dointvec_jiffies(ctl_table *table, int write, struct file *filp,
2459 void __user *buffer, size_t *lenp, loff_t *ppos)
2460 {
2461 return -ENOSYS;
2462 }
2463
2464 int proc_dointvec_userhz_jiffies(ctl_table *table, int write, struct file *filp,
2465 void __user *buffer, size_t *lenp, loff_t *ppos)
2466 {
2467 return -ENOSYS;
2468 }
2469
2470 int proc_dointvec_ms_jiffies(ctl_table *table, int write, struct file *filp,
2471 void __user *buffer, size_t *lenp, loff_t *ppos)
2472 {
2473 return -ENOSYS;
2474 }
2475
2476 int proc_doulongvec_minmax(ctl_table *table, int write, struct file *filp,
2477 void __user *buffer, size_t *lenp, loff_t *ppos)
2478 {
2479 return -ENOSYS;
2480 }
2481
2482 int proc_doulongvec_ms_jiffies_minmax(ctl_table *table, int write,
2483 struct file *filp,
2484 void __user *buffer,
2485 size_t *lenp, loff_t *ppos)
2486 {
2487 return -ENOSYS;
2488 }
2489
2490 struct ctl_table_header * register_sysctl_table(ctl_table * table,
2491 int insert_at_head)
2492 {
2493 return NULL;
2494 }
2495
2496 void unregister_sysctl_table(struct ctl_table_header * table)
2497 {
2498 }
2499
2500 #endif /* CONFIG_SYSCTL */
2501
2502 /*
2503 * No sense putting this after each symbol definition, twice,
2504 * exception granted :-)
2505 */
2506 EXPORT_SYMBOL(proc_dointvec);
2507 EXPORT_SYMBOL(proc_dointvec_jiffies);
2508 EXPORT_SYMBOL(proc_dointvec_minmax);
2509 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2510 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2511 EXPORT_SYMBOL(proc_dostring);
2512 EXPORT_SYMBOL(proc_doulongvec_minmax);
2513 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
2514 EXPORT_SYMBOL(register_sysctl_table);
2515 EXPORT_SYMBOL(sysctl_intvec);
2516 EXPORT_SYMBOL(sysctl_jiffies);
2517 EXPORT_SYMBOL(sysctl_ms_jiffies);
2518 EXPORT_SYMBOL(sysctl_string);
2519 EXPORT_SYMBOL(unregister_sysctl_table);
linux v2.6.22.y-op