2 * sysctl.c: General linux system control interface
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
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
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
21 #include <linux/module.h>
23 #include <linux/swap.h>
24 #include <linux/slab.h>
25 #include <linux/sysctl.h>
26 #include <linux/proc_fs.h>
27 #include <linux/security.h>
28 #include <linux/ctype.h>
29 #include <linux/utsname.h>
30 #include <linux/smp_lock.h>
32 #include <linux/init.h>
33 #include <linux/kernel.h>
34 #include <linux/kobject.h>
35 #include <linux/net.h>
36 #include <linux/sysrq.h>
37 #include <linux/highuid.h>
38 #include <linux/writeback.h>
39 #include <linux/hugetlb.h>
40 #include <linux/initrd.h>
41 #include <linux/key.h>
42 #include <linux/times.h>
43 #include <linux/limits.h>
44 #include <linux/dcache.h>
45 #include <linux/syscalls.h>
46 #include <linux/vmstat.h>
47 #include <linux/nfs_fs.h>
48 #include <linux/acpi.h>
49 #include <linux/reboot.h>
50 #include <linux/ftrace.h>
52 #include <asm/uaccess.h>
53 #include <asm/processor.h>
57 #include <asm/stacktrace.h>
61 static int deprecated_sysctl_warning(struct __sysctl_args
*args
);
63 #if defined(CONFIG_SYSCTL)
65 /* External variables not in a header file. */
67 extern int print_fatal_signals
;
68 extern int sysctl_overcommit_memory
;
69 extern int sysctl_overcommit_ratio
;
70 extern int sysctl_panic_on_oom
;
71 extern int sysctl_oom_kill_allocating_task
;
72 extern int sysctl_oom_dump_tasks
;
73 extern int max_threads
;
74 extern int core_uses_pid
;
75 extern int suid_dumpable
;
76 extern char core_pattern
[];
78 extern int min_free_kbytes
;
79 extern int pid_max_min
, pid_max_max
;
80 extern int sysctl_drop_caches
;
81 extern int percpu_pagelist_fraction
;
82 extern int compat_log
;
83 extern int latencytop_enabled
;
84 extern int sysctl_nr_open_min
, sysctl_nr_open_max
;
85 #ifdef CONFIG_RCU_TORTURE_TEST
86 extern int rcutorture_runnable
;
87 #endif /* #ifdef CONFIG_RCU_TORTURE_TEST */
89 /* Constants used for minimum and maximum */
90 #if defined(CONFIG_HIGHMEM) || defined(CONFIG_DETECT_SOFTLOCKUP)
94 #ifdef CONFIG_DETECT_SOFTLOCKUP
95 static int sixty
= 60;
96 static int neg_one
= -1;
99 #if defined(CONFIG_MMU) && defined(CONFIG_FILE_LOCKING)
104 static int one_hundred
= 100;
106 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
107 static int maxolduid
= 65535;
108 static int minolduid
;
109 static int min_percpu_pagelist_fract
= 8;
111 static int ngroups_max
= NGROUPS_MAX
;
113 #ifdef CONFIG_MODULES
114 extern char modprobe_path
[];
116 #ifdef CONFIG_CHR_DEV_SG
117 extern int sg_big_buff
;
121 #include <asm/system.h>
125 extern int pwrsw_enabled
;
126 extern int unaligned_enabled
;
130 #ifdef CONFIG_MATHEMU
131 extern int sysctl_ieee_emulation_warnings
;
133 extern int sysctl_userprocess_debug
;
134 extern int spin_retry
;
137 #ifdef CONFIG_BSD_PROCESS_ACCT
138 extern int acct_parm
[];
142 extern int no_unaligned_warning
;
145 #ifdef CONFIG_RT_MUTEXES
146 extern int max_lock_depth
;
149 #ifdef CONFIG_PROC_SYSCTL
150 static int proc_do_cad_pid(struct ctl_table
*table
, int write
, struct file
*filp
,
151 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
152 static int proc_dointvec_taint(struct ctl_table
*table
, int write
, struct file
*filp
,
153 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
);
156 static struct ctl_table root_table
[];
157 static struct ctl_table_root sysctl_table_root
;
158 static struct ctl_table_header root_table_header
= {
160 .ctl_table
= root_table
,
161 .ctl_entry
= LIST_HEAD_INIT(sysctl_table_root
.default_set
.list
),
162 .root
= &sysctl_table_root
,
163 .set
= &sysctl_table_root
.default_set
,
165 static struct ctl_table_root sysctl_table_root
= {
166 .root_list
= LIST_HEAD_INIT(sysctl_table_root
.root_list
),
167 .default_set
.list
= LIST_HEAD_INIT(root_table_header
.ctl_entry
),
170 static struct ctl_table kern_table
[];
171 static struct ctl_table vm_table
[];
172 static struct ctl_table fs_table
[];
173 static struct ctl_table debug_table
[];
174 static struct ctl_table dev_table
[];
175 extern struct ctl_table random_table
[];
176 #ifdef CONFIG_INOTIFY_USER
177 extern struct ctl_table inotify_table
[];
180 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
181 int sysctl_legacy_va_layout
;
184 extern int prove_locking
;
185 extern int lock_stat
;
187 /* The default sysctl tables: */
189 static struct ctl_table root_table
[] = {
191 .ctl_name
= CTL_KERN
,
192 .procname
= "kernel",
209 .ctl_name
= CTL_DEBUG
,
212 .child
= debug_table
,
221 * NOTE: do not add new entries to this table unless you have read
222 * Documentation/sysctl/ctl_unnumbered.txt
227 #ifdef CONFIG_SCHED_DEBUG
228 static int min_sched_granularity_ns
= 100000; /* 100 usecs */
229 static int max_sched_granularity_ns
= NSEC_PER_SEC
; /* 1 second */
230 static int min_wakeup_granularity_ns
; /* 0 usecs */
231 static int max_wakeup_granularity_ns
= NSEC_PER_SEC
; /* 1 second */
234 static struct ctl_table kern_table
[] = {
235 #ifdef CONFIG_SCHED_DEBUG
237 .ctl_name
= CTL_UNNUMBERED
,
238 .procname
= "sched_min_granularity_ns",
239 .data
= &sysctl_sched_min_granularity
,
240 .maxlen
= sizeof(unsigned int),
242 .proc_handler
= &sched_nr_latency_handler
,
243 .strategy
= &sysctl_intvec
,
244 .extra1
= &min_sched_granularity_ns
,
245 .extra2
= &max_sched_granularity_ns
,
248 .ctl_name
= CTL_UNNUMBERED
,
249 .procname
= "sched_latency_ns",
250 .data
= &sysctl_sched_latency
,
251 .maxlen
= sizeof(unsigned int),
253 .proc_handler
= &sched_nr_latency_handler
,
254 .strategy
= &sysctl_intvec
,
255 .extra1
= &min_sched_granularity_ns
,
256 .extra2
= &max_sched_granularity_ns
,
259 .ctl_name
= CTL_UNNUMBERED
,
260 .procname
= "sched_wakeup_granularity_ns",
261 .data
= &sysctl_sched_wakeup_granularity
,
262 .maxlen
= sizeof(unsigned int),
264 .proc_handler
= &proc_dointvec_minmax
,
265 .strategy
= &sysctl_intvec
,
266 .extra1
= &min_wakeup_granularity_ns
,
267 .extra2
= &max_wakeup_granularity_ns
,
270 .ctl_name
= CTL_UNNUMBERED
,
271 .procname
= "sched_shares_ratelimit",
272 .data
= &sysctl_sched_shares_ratelimit
,
273 .maxlen
= sizeof(unsigned int),
275 .proc_handler
= &proc_dointvec
,
278 .ctl_name
= CTL_UNNUMBERED
,
279 .procname
= "sched_child_runs_first",
280 .data
= &sysctl_sched_child_runs_first
,
281 .maxlen
= sizeof(unsigned int),
283 .proc_handler
= &proc_dointvec
,
286 .ctl_name
= CTL_UNNUMBERED
,
287 .procname
= "sched_features",
288 .data
= &sysctl_sched_features
,
289 .maxlen
= sizeof(unsigned int),
291 .proc_handler
= &proc_dointvec
,
294 .ctl_name
= CTL_UNNUMBERED
,
295 .procname
= "sched_migration_cost",
296 .data
= &sysctl_sched_migration_cost
,
297 .maxlen
= sizeof(unsigned int),
299 .proc_handler
= &proc_dointvec
,
302 .ctl_name
= CTL_UNNUMBERED
,
303 .procname
= "sched_nr_migrate",
304 .data
= &sysctl_sched_nr_migrate
,
305 .maxlen
= sizeof(unsigned int),
307 .proc_handler
= &proc_dointvec
,
311 .ctl_name
= CTL_UNNUMBERED
,
312 .procname
= "sched_rt_period_us",
313 .data
= &sysctl_sched_rt_period
,
314 .maxlen
= sizeof(unsigned int),
316 .proc_handler
= &sched_rt_handler
,
319 .ctl_name
= CTL_UNNUMBERED
,
320 .procname
= "sched_rt_runtime_us",
321 .data
= &sysctl_sched_rt_runtime
,
322 .maxlen
= sizeof(int),
324 .proc_handler
= &sched_rt_handler
,
327 .ctl_name
= CTL_UNNUMBERED
,
328 .procname
= "sched_compat_yield",
329 .data
= &sysctl_sched_compat_yield
,
330 .maxlen
= sizeof(unsigned int),
332 .proc_handler
= &proc_dointvec
,
334 #ifdef CONFIG_PROVE_LOCKING
336 .ctl_name
= CTL_UNNUMBERED
,
337 .procname
= "prove_locking",
338 .data
= &prove_locking
,
339 .maxlen
= sizeof(int),
341 .proc_handler
= &proc_dointvec
,
344 #ifdef CONFIG_LOCK_STAT
346 .ctl_name
= CTL_UNNUMBERED
,
347 .procname
= "lock_stat",
349 .maxlen
= sizeof(int),
351 .proc_handler
= &proc_dointvec
,
355 .ctl_name
= KERN_PANIC
,
357 .data
= &panic_timeout
,
358 .maxlen
= sizeof(int),
360 .proc_handler
= &proc_dointvec
,
363 .ctl_name
= KERN_CORE_USES_PID
,
364 .procname
= "core_uses_pid",
365 .data
= &core_uses_pid
,
366 .maxlen
= sizeof(int),
368 .proc_handler
= &proc_dointvec
,
371 .ctl_name
= KERN_CORE_PATTERN
,
372 .procname
= "core_pattern",
373 .data
= core_pattern
,
374 .maxlen
= CORENAME_MAX_SIZE
,
376 .proc_handler
= &proc_dostring
,
377 .strategy
= &sysctl_string
,
379 #ifdef CONFIG_PROC_SYSCTL
381 .procname
= "tainted",
383 .maxlen
= sizeof(int),
385 .proc_handler
= &proc_dointvec_taint
,
388 #ifdef CONFIG_LATENCYTOP
390 .procname
= "latencytop",
391 .data
= &latencytop_enabled
,
392 .maxlen
= sizeof(int),
394 .proc_handler
= &proc_dointvec
,
397 #ifdef CONFIG_BLK_DEV_INITRD
399 .ctl_name
= KERN_REALROOTDEV
,
400 .procname
= "real-root-dev",
401 .data
= &real_root_dev
,
402 .maxlen
= sizeof(int),
404 .proc_handler
= &proc_dointvec
,
408 .ctl_name
= CTL_UNNUMBERED
,
409 .procname
= "print-fatal-signals",
410 .data
= &print_fatal_signals
,
411 .maxlen
= sizeof(int),
413 .proc_handler
= &proc_dointvec
,
417 .ctl_name
= KERN_SPARC_REBOOT
,
418 .procname
= "reboot-cmd",
419 .data
= reboot_command
,
422 .proc_handler
= &proc_dostring
,
423 .strategy
= &sysctl_string
,
426 .ctl_name
= KERN_SPARC_STOP_A
,
427 .procname
= "stop-a",
428 .data
= &stop_a_enabled
,
429 .maxlen
= sizeof (int),
431 .proc_handler
= &proc_dointvec
,
434 .ctl_name
= KERN_SPARC_SCONS_PWROFF
,
435 .procname
= "scons-poweroff",
436 .data
= &scons_pwroff
,
437 .maxlen
= sizeof (int),
439 .proc_handler
= &proc_dointvec
,
444 .ctl_name
= KERN_HPPA_PWRSW
,
445 .procname
= "soft-power",
446 .data
= &pwrsw_enabled
,
447 .maxlen
= sizeof (int),
449 .proc_handler
= &proc_dointvec
,
452 .ctl_name
= KERN_HPPA_UNALIGNED
,
453 .procname
= "unaligned-trap",
454 .data
= &unaligned_enabled
,
455 .maxlen
= sizeof (int),
457 .proc_handler
= &proc_dointvec
,
461 .ctl_name
= KERN_CTLALTDEL
,
462 .procname
= "ctrl-alt-del",
464 .maxlen
= sizeof(int),
466 .proc_handler
= &proc_dointvec
,
470 .ctl_name
= CTL_UNNUMBERED
,
471 .procname
= "ftrace_enabled",
472 .data
= &ftrace_enabled
,
473 .maxlen
= sizeof(int),
475 .proc_handler
= &ftrace_enable_sysctl
,
478 #ifdef CONFIG_MODULES
480 .ctl_name
= KERN_MODPROBE
,
481 .procname
= "modprobe",
482 .data
= &modprobe_path
,
483 .maxlen
= KMOD_PATH_LEN
,
485 .proc_handler
= &proc_dostring
,
486 .strategy
= &sysctl_string
,
489 #if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
491 .ctl_name
= KERN_HOTPLUG
,
492 .procname
= "hotplug",
493 .data
= &uevent_helper
,
494 .maxlen
= UEVENT_HELPER_PATH_LEN
,
496 .proc_handler
= &proc_dostring
,
497 .strategy
= &sysctl_string
,
500 #ifdef CONFIG_CHR_DEV_SG
502 .ctl_name
= KERN_SG_BIG_BUFF
,
503 .procname
= "sg-big-buff",
504 .data
= &sg_big_buff
,
505 .maxlen
= sizeof (int),
507 .proc_handler
= &proc_dointvec
,
510 #ifdef CONFIG_BSD_PROCESS_ACCT
512 .ctl_name
= KERN_ACCT
,
515 .maxlen
= 3*sizeof(int),
517 .proc_handler
= &proc_dointvec
,
520 #ifdef CONFIG_MAGIC_SYSRQ
522 .ctl_name
= KERN_SYSRQ
,
524 .data
= &__sysrq_enabled
,
525 .maxlen
= sizeof (int),
527 .proc_handler
= &proc_dointvec
,
530 #ifdef CONFIG_PROC_SYSCTL
532 .procname
= "cad_pid",
534 .maxlen
= sizeof (int),
536 .proc_handler
= &proc_do_cad_pid
,
540 .ctl_name
= KERN_MAX_THREADS
,
541 .procname
= "threads-max",
542 .data
= &max_threads
,
543 .maxlen
= sizeof(int),
545 .proc_handler
= &proc_dointvec
,
548 .ctl_name
= KERN_RANDOM
,
549 .procname
= "random",
551 .child
= random_table
,
554 .ctl_name
= KERN_OVERFLOWUID
,
555 .procname
= "overflowuid",
556 .data
= &overflowuid
,
557 .maxlen
= sizeof(int),
559 .proc_handler
= &proc_dointvec_minmax
,
560 .strategy
= &sysctl_intvec
,
561 .extra1
= &minolduid
,
562 .extra2
= &maxolduid
,
565 .ctl_name
= KERN_OVERFLOWGID
,
566 .procname
= "overflowgid",
567 .data
= &overflowgid
,
568 .maxlen
= sizeof(int),
570 .proc_handler
= &proc_dointvec_minmax
,
571 .strategy
= &sysctl_intvec
,
572 .extra1
= &minolduid
,
573 .extra2
= &maxolduid
,
576 #ifdef CONFIG_MATHEMU
578 .ctl_name
= KERN_IEEE_EMULATION_WARNINGS
,
579 .procname
= "ieee_emulation_warnings",
580 .data
= &sysctl_ieee_emulation_warnings
,
581 .maxlen
= sizeof(int),
583 .proc_handler
= &proc_dointvec
,
587 .ctl_name
= KERN_S390_USER_DEBUG_LOGGING
,
588 .procname
= "userprocess_debug",
589 .data
= &sysctl_userprocess_debug
,
590 .maxlen
= sizeof(int),
592 .proc_handler
= &proc_dointvec
,
596 .ctl_name
= KERN_PIDMAX
,
597 .procname
= "pid_max",
599 .maxlen
= sizeof (int),
601 .proc_handler
= &proc_dointvec_minmax
,
602 .strategy
= sysctl_intvec
,
603 .extra1
= &pid_max_min
,
604 .extra2
= &pid_max_max
,
607 .ctl_name
= KERN_PANIC_ON_OOPS
,
608 .procname
= "panic_on_oops",
609 .data
= &panic_on_oops
,
610 .maxlen
= sizeof(int),
612 .proc_handler
= &proc_dointvec
,
614 #if defined CONFIG_PRINTK
616 .ctl_name
= KERN_PRINTK
,
617 .procname
= "printk",
618 .data
= &console_loglevel
,
619 .maxlen
= 4*sizeof(int),
621 .proc_handler
= &proc_dointvec
,
624 .ctl_name
= KERN_PRINTK_RATELIMIT
,
625 .procname
= "printk_ratelimit",
626 .data
= &printk_ratelimit_state
.interval
,
627 .maxlen
= sizeof(int),
629 .proc_handler
= &proc_dointvec_jiffies
,
630 .strategy
= &sysctl_jiffies
,
633 .ctl_name
= KERN_PRINTK_RATELIMIT_BURST
,
634 .procname
= "printk_ratelimit_burst",
635 .data
= &printk_ratelimit_state
.burst
,
636 .maxlen
= sizeof(int),
638 .proc_handler
= &proc_dointvec
,
642 .ctl_name
= KERN_NGROUPS_MAX
,
643 .procname
= "ngroups_max",
644 .data
= &ngroups_max
,
645 .maxlen
= sizeof (int),
647 .proc_handler
= &proc_dointvec
,
649 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
651 .ctl_name
= KERN_UNKNOWN_NMI_PANIC
,
652 .procname
= "unknown_nmi_panic",
653 .data
= &unknown_nmi_panic
,
654 .maxlen
= sizeof (int),
656 .proc_handler
= &proc_dointvec
,
659 .procname
= "nmi_watchdog",
660 .data
= &nmi_watchdog_enabled
,
661 .maxlen
= sizeof (int),
663 .proc_handler
= &proc_nmi_enabled
,
666 #if defined(CONFIG_X86)
668 .ctl_name
= KERN_PANIC_ON_NMI
,
669 .procname
= "panic_on_unrecovered_nmi",
670 .data
= &panic_on_unrecovered_nmi
,
671 .maxlen
= sizeof(int),
673 .proc_handler
= &proc_dointvec
,
676 .ctl_name
= KERN_BOOTLOADER_TYPE
,
677 .procname
= "bootloader_type",
678 .data
= &bootloader_type
,
679 .maxlen
= sizeof (int),
681 .proc_handler
= &proc_dointvec
,
684 .ctl_name
= CTL_UNNUMBERED
,
685 .procname
= "kstack_depth_to_print",
686 .data
= &kstack_depth_to_print
,
687 .maxlen
= sizeof(int),
689 .proc_handler
= &proc_dointvec
,
692 .ctl_name
= CTL_UNNUMBERED
,
693 .procname
= "io_delay_type",
694 .data
= &io_delay_type
,
695 .maxlen
= sizeof(int),
697 .proc_handler
= &proc_dointvec
,
700 #if defined(CONFIG_MMU)
702 .ctl_name
= KERN_RANDOMIZE
,
703 .procname
= "randomize_va_space",
704 .data
= &randomize_va_space
,
705 .maxlen
= sizeof(int),
707 .proc_handler
= &proc_dointvec
,
710 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
712 .ctl_name
= KERN_SPIN_RETRY
,
713 .procname
= "spin_retry",
715 .maxlen
= sizeof (int),
717 .proc_handler
= &proc_dointvec
,
720 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
722 .procname
= "acpi_video_flags",
723 .data
= &acpi_realmode_flags
,
724 .maxlen
= sizeof (unsigned long),
726 .proc_handler
= &proc_doulongvec_minmax
,
731 .ctl_name
= KERN_IA64_UNALIGNED
,
732 .procname
= "ignore-unaligned-usertrap",
733 .data
= &no_unaligned_warning
,
734 .maxlen
= sizeof (int),
736 .proc_handler
= &proc_dointvec
,
739 #ifdef CONFIG_DETECT_SOFTLOCKUP
741 .ctl_name
= CTL_UNNUMBERED
,
742 .procname
= "softlockup_panic",
743 .data
= &softlockup_panic
,
744 .maxlen
= sizeof(int),
746 .proc_handler
= &proc_dointvec_minmax
,
747 .strategy
= &sysctl_intvec
,
752 .ctl_name
= CTL_UNNUMBERED
,
753 .procname
= "softlockup_thresh",
754 .data
= &softlockup_thresh
,
755 .maxlen
= sizeof(int),
757 .proc_handler
= &proc_dointvec_minmax
,
758 .strategy
= &sysctl_intvec
,
763 .ctl_name
= CTL_UNNUMBERED
,
764 .procname
= "hung_task_check_count",
765 .data
= &sysctl_hung_task_check_count
,
766 .maxlen
= sizeof(unsigned long),
768 .proc_handler
= &proc_doulongvec_minmax
,
769 .strategy
= &sysctl_intvec
,
772 .ctl_name
= CTL_UNNUMBERED
,
773 .procname
= "hung_task_timeout_secs",
774 .data
= &sysctl_hung_task_timeout_secs
,
775 .maxlen
= sizeof(unsigned long),
777 .proc_handler
= &proc_doulongvec_minmax
,
778 .strategy
= &sysctl_intvec
,
781 .ctl_name
= CTL_UNNUMBERED
,
782 .procname
= "hung_task_warnings",
783 .data
= &sysctl_hung_task_warnings
,
784 .maxlen
= sizeof(unsigned long),
786 .proc_handler
= &proc_doulongvec_minmax
,
787 .strategy
= &sysctl_intvec
,
792 .ctl_name
= KERN_COMPAT_LOG
,
793 .procname
= "compat-log",
795 .maxlen
= sizeof (int),
797 .proc_handler
= &proc_dointvec
,
800 #ifdef CONFIG_RT_MUTEXES
802 .ctl_name
= KERN_MAX_LOCK_DEPTH
,
803 .procname
= "max_lock_depth",
804 .data
= &max_lock_depth
,
805 .maxlen
= sizeof(int),
807 .proc_handler
= &proc_dointvec
,
811 .ctl_name
= CTL_UNNUMBERED
,
812 .procname
= "poweroff_cmd",
813 .data
= &poweroff_cmd
,
814 .maxlen
= POWEROFF_CMD_PATH_LEN
,
816 .proc_handler
= &proc_dostring
,
817 .strategy
= &sysctl_string
,
821 .ctl_name
= CTL_UNNUMBERED
,
824 .child
= key_sysctls
,
827 #ifdef CONFIG_RCU_TORTURE_TEST
829 .ctl_name
= CTL_UNNUMBERED
,
830 .procname
= "rcutorture_runnable",
831 .data
= &rcutorture_runnable
,
832 .maxlen
= sizeof(int),
834 .proc_handler
= &proc_dointvec
,
838 * NOTE: do not add new entries to this table unless you have read
839 * Documentation/sysctl/ctl_unnumbered.txt
844 static struct ctl_table vm_table
[] = {
846 .ctl_name
= VM_OVERCOMMIT_MEMORY
,
847 .procname
= "overcommit_memory",
848 .data
= &sysctl_overcommit_memory
,
849 .maxlen
= sizeof(sysctl_overcommit_memory
),
851 .proc_handler
= &proc_dointvec
,
854 .ctl_name
= VM_PANIC_ON_OOM
,
855 .procname
= "panic_on_oom",
856 .data
= &sysctl_panic_on_oom
,
857 .maxlen
= sizeof(sysctl_panic_on_oom
),
859 .proc_handler
= &proc_dointvec
,
862 .ctl_name
= CTL_UNNUMBERED
,
863 .procname
= "oom_kill_allocating_task",
864 .data
= &sysctl_oom_kill_allocating_task
,
865 .maxlen
= sizeof(sysctl_oom_kill_allocating_task
),
867 .proc_handler
= &proc_dointvec
,
870 .ctl_name
= CTL_UNNUMBERED
,
871 .procname
= "oom_dump_tasks",
872 .data
= &sysctl_oom_dump_tasks
,
873 .maxlen
= sizeof(sysctl_oom_dump_tasks
),
875 .proc_handler
= &proc_dointvec
,
878 .ctl_name
= VM_OVERCOMMIT_RATIO
,
879 .procname
= "overcommit_ratio",
880 .data
= &sysctl_overcommit_ratio
,
881 .maxlen
= sizeof(sysctl_overcommit_ratio
),
883 .proc_handler
= &proc_dointvec
,
886 .ctl_name
= VM_PAGE_CLUSTER
,
887 .procname
= "page-cluster",
888 .data
= &page_cluster
,
889 .maxlen
= sizeof(int),
891 .proc_handler
= &proc_dointvec
,
894 .ctl_name
= VM_DIRTY_BACKGROUND
,
895 .procname
= "dirty_background_ratio",
896 .data
= &dirty_background_ratio
,
897 .maxlen
= sizeof(dirty_background_ratio
),
899 .proc_handler
= &proc_dointvec_minmax
,
900 .strategy
= &sysctl_intvec
,
902 .extra2
= &one_hundred
,
905 .ctl_name
= VM_DIRTY_RATIO
,
906 .procname
= "dirty_ratio",
907 .data
= &vm_dirty_ratio
,
908 .maxlen
= sizeof(vm_dirty_ratio
),
910 .proc_handler
= &dirty_ratio_handler
,
911 .strategy
= &sysctl_intvec
,
913 .extra2
= &one_hundred
,
916 .procname
= "dirty_writeback_centisecs",
917 .data
= &dirty_writeback_interval
,
918 .maxlen
= sizeof(dirty_writeback_interval
),
920 .proc_handler
= &dirty_writeback_centisecs_handler
,
923 .procname
= "dirty_expire_centisecs",
924 .data
= &dirty_expire_interval
,
925 .maxlen
= sizeof(dirty_expire_interval
),
927 .proc_handler
= &proc_dointvec_userhz_jiffies
,
930 .ctl_name
= VM_NR_PDFLUSH_THREADS
,
931 .procname
= "nr_pdflush_threads",
932 .data
= &nr_pdflush_threads
,
933 .maxlen
= sizeof nr_pdflush_threads
,
934 .mode
= 0444 /* read-only*/,
935 .proc_handler
= &proc_dointvec
,
938 .ctl_name
= VM_SWAPPINESS
,
939 .procname
= "swappiness",
940 .data
= &vm_swappiness
,
941 .maxlen
= sizeof(vm_swappiness
),
943 .proc_handler
= &proc_dointvec_minmax
,
944 .strategy
= &sysctl_intvec
,
946 .extra2
= &one_hundred
,
948 #ifdef CONFIG_HUGETLB_PAGE
950 .procname
= "nr_hugepages",
952 .maxlen
= sizeof(unsigned long),
954 .proc_handler
= &hugetlb_sysctl_handler
,
955 .extra1
= (void *)&hugetlb_zero
,
956 .extra2
= (void *)&hugetlb_infinity
,
959 .ctl_name
= VM_HUGETLB_GROUP
,
960 .procname
= "hugetlb_shm_group",
961 .data
= &sysctl_hugetlb_shm_group
,
962 .maxlen
= sizeof(gid_t
),
964 .proc_handler
= &proc_dointvec
,
967 .ctl_name
= CTL_UNNUMBERED
,
968 .procname
= "hugepages_treat_as_movable",
969 .data
= &hugepages_treat_as_movable
,
970 .maxlen
= sizeof(int),
972 .proc_handler
= &hugetlb_treat_movable_handler
,
975 .ctl_name
= CTL_UNNUMBERED
,
976 .procname
= "nr_overcommit_hugepages",
978 .maxlen
= sizeof(unsigned long),
980 .proc_handler
= &hugetlb_overcommit_handler
,
981 .extra1
= (void *)&hugetlb_zero
,
982 .extra2
= (void *)&hugetlb_infinity
,
986 .ctl_name
= VM_LOWMEM_RESERVE_RATIO
,
987 .procname
= "lowmem_reserve_ratio",
988 .data
= &sysctl_lowmem_reserve_ratio
,
989 .maxlen
= sizeof(sysctl_lowmem_reserve_ratio
),
991 .proc_handler
= &lowmem_reserve_ratio_sysctl_handler
,
992 .strategy
= &sysctl_intvec
,
995 .ctl_name
= VM_DROP_PAGECACHE
,
996 .procname
= "drop_caches",
997 .data
= &sysctl_drop_caches
,
998 .maxlen
= sizeof(int),
1000 .proc_handler
= drop_caches_sysctl_handler
,
1001 .strategy
= &sysctl_intvec
,
1004 .ctl_name
= VM_MIN_FREE_KBYTES
,
1005 .procname
= "min_free_kbytes",
1006 .data
= &min_free_kbytes
,
1007 .maxlen
= sizeof(min_free_kbytes
),
1009 .proc_handler
= &min_free_kbytes_sysctl_handler
,
1010 .strategy
= &sysctl_intvec
,
1014 .ctl_name
= VM_PERCPU_PAGELIST_FRACTION
,
1015 .procname
= "percpu_pagelist_fraction",
1016 .data
= &percpu_pagelist_fraction
,
1017 .maxlen
= sizeof(percpu_pagelist_fraction
),
1019 .proc_handler
= &percpu_pagelist_fraction_sysctl_handler
,
1020 .strategy
= &sysctl_intvec
,
1021 .extra1
= &min_percpu_pagelist_fract
,
1025 .ctl_name
= VM_MAX_MAP_COUNT
,
1026 .procname
= "max_map_count",
1027 .data
= &sysctl_max_map_count
,
1028 .maxlen
= sizeof(sysctl_max_map_count
),
1030 .proc_handler
= &proc_dointvec
1034 .ctl_name
= VM_LAPTOP_MODE
,
1035 .procname
= "laptop_mode",
1036 .data
= &laptop_mode
,
1037 .maxlen
= sizeof(laptop_mode
),
1039 .proc_handler
= &proc_dointvec_jiffies
,
1040 .strategy
= &sysctl_jiffies
,
1043 .ctl_name
= VM_BLOCK_DUMP
,
1044 .procname
= "block_dump",
1045 .data
= &block_dump
,
1046 .maxlen
= sizeof(block_dump
),
1048 .proc_handler
= &proc_dointvec
,
1049 .strategy
= &sysctl_intvec
,
1053 .ctl_name
= VM_VFS_CACHE_PRESSURE
,
1054 .procname
= "vfs_cache_pressure",
1055 .data
= &sysctl_vfs_cache_pressure
,
1056 .maxlen
= sizeof(sysctl_vfs_cache_pressure
),
1058 .proc_handler
= &proc_dointvec
,
1059 .strategy
= &sysctl_intvec
,
1062 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1064 .ctl_name
= VM_LEGACY_VA_LAYOUT
,
1065 .procname
= "legacy_va_layout",
1066 .data
= &sysctl_legacy_va_layout
,
1067 .maxlen
= sizeof(sysctl_legacy_va_layout
),
1069 .proc_handler
= &proc_dointvec
,
1070 .strategy
= &sysctl_intvec
,
1076 .ctl_name
= VM_ZONE_RECLAIM_MODE
,
1077 .procname
= "zone_reclaim_mode",
1078 .data
= &zone_reclaim_mode
,
1079 .maxlen
= sizeof(zone_reclaim_mode
),
1081 .proc_handler
= &proc_dointvec
,
1082 .strategy
= &sysctl_intvec
,
1086 .ctl_name
= VM_MIN_UNMAPPED
,
1087 .procname
= "min_unmapped_ratio",
1088 .data
= &sysctl_min_unmapped_ratio
,
1089 .maxlen
= sizeof(sysctl_min_unmapped_ratio
),
1091 .proc_handler
= &sysctl_min_unmapped_ratio_sysctl_handler
,
1092 .strategy
= &sysctl_intvec
,
1094 .extra2
= &one_hundred
,
1097 .ctl_name
= VM_MIN_SLAB
,
1098 .procname
= "min_slab_ratio",
1099 .data
= &sysctl_min_slab_ratio
,
1100 .maxlen
= sizeof(sysctl_min_slab_ratio
),
1102 .proc_handler
= &sysctl_min_slab_ratio_sysctl_handler
,
1103 .strategy
= &sysctl_intvec
,
1105 .extra2
= &one_hundred
,
1110 .ctl_name
= CTL_UNNUMBERED
,
1111 .procname
= "stat_interval",
1112 .data
= &sysctl_stat_interval
,
1113 .maxlen
= sizeof(sysctl_stat_interval
),
1115 .proc_handler
= &proc_dointvec_jiffies
,
1116 .strategy
= &sysctl_jiffies
,
1119 #ifdef CONFIG_SECURITY
1121 .ctl_name
= CTL_UNNUMBERED
,
1122 .procname
= "mmap_min_addr",
1123 .data
= &mmap_min_addr
,
1124 .maxlen
= sizeof(unsigned long),
1126 .proc_handler
= &proc_doulongvec_minmax
,
1131 .ctl_name
= CTL_UNNUMBERED
,
1132 .procname
= "numa_zonelist_order",
1133 .data
= &numa_zonelist_order
,
1134 .maxlen
= NUMA_ZONELIST_ORDER_LEN
,
1136 .proc_handler
= &numa_zonelist_order_handler
,
1137 .strategy
= &sysctl_string
,
1140 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1141 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1143 .ctl_name
= VM_VDSO_ENABLED
,
1144 .procname
= "vdso_enabled",
1145 .data
= &vdso_enabled
,
1146 .maxlen
= sizeof(vdso_enabled
),
1148 .proc_handler
= &proc_dointvec
,
1149 .strategy
= &sysctl_intvec
,
1153 #ifdef CONFIG_HIGHMEM
1155 .ctl_name
= CTL_UNNUMBERED
,
1156 .procname
= "highmem_is_dirtyable",
1157 .data
= &vm_highmem_is_dirtyable
,
1158 .maxlen
= sizeof(vm_highmem_is_dirtyable
),
1160 .proc_handler
= &proc_dointvec_minmax
,
1161 .strategy
= &sysctl_intvec
,
1167 * NOTE: do not add new entries to this table unless you have read
1168 * Documentation/sysctl/ctl_unnumbered.txt
1173 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1174 static struct ctl_table binfmt_misc_table
[] = {
1179 static struct ctl_table fs_table
[] = {
1181 .ctl_name
= FS_NRINODE
,
1182 .procname
= "inode-nr",
1183 .data
= &inodes_stat
,
1184 .maxlen
= 2*sizeof(int),
1186 .proc_handler
= &proc_dointvec
,
1189 .ctl_name
= FS_STATINODE
,
1190 .procname
= "inode-state",
1191 .data
= &inodes_stat
,
1192 .maxlen
= 7*sizeof(int),
1194 .proc_handler
= &proc_dointvec
,
1197 .procname
= "file-nr",
1198 .data
= &files_stat
,
1199 .maxlen
= 3*sizeof(int),
1201 .proc_handler
= &proc_nr_files
,
1204 .ctl_name
= FS_MAXFILE
,
1205 .procname
= "file-max",
1206 .data
= &files_stat
.max_files
,
1207 .maxlen
= sizeof(int),
1209 .proc_handler
= &proc_dointvec
,
1212 .ctl_name
= CTL_UNNUMBERED
,
1213 .procname
= "nr_open",
1214 .data
= &sysctl_nr_open
,
1215 .maxlen
= sizeof(int),
1217 .proc_handler
= &proc_dointvec_minmax
,
1218 .extra1
= &sysctl_nr_open_min
,
1219 .extra2
= &sysctl_nr_open_max
,
1222 .ctl_name
= FS_DENTRY
,
1223 .procname
= "dentry-state",
1224 .data
= &dentry_stat
,
1225 .maxlen
= 6*sizeof(int),
1227 .proc_handler
= &proc_dointvec
,
1230 .ctl_name
= FS_OVERFLOWUID
,
1231 .procname
= "overflowuid",
1232 .data
= &fs_overflowuid
,
1233 .maxlen
= sizeof(int),
1235 .proc_handler
= &proc_dointvec_minmax
,
1236 .strategy
= &sysctl_intvec
,
1237 .extra1
= &minolduid
,
1238 .extra2
= &maxolduid
,
1241 .ctl_name
= FS_OVERFLOWGID
,
1242 .procname
= "overflowgid",
1243 .data
= &fs_overflowgid
,
1244 .maxlen
= sizeof(int),
1246 .proc_handler
= &proc_dointvec_minmax
,
1247 .strategy
= &sysctl_intvec
,
1248 .extra1
= &minolduid
,
1249 .extra2
= &maxolduid
,
1251 #ifdef CONFIG_FILE_LOCKING
1253 .ctl_name
= FS_LEASES
,
1254 .procname
= "leases-enable",
1255 .data
= &leases_enable
,
1256 .maxlen
= sizeof(int),
1258 .proc_handler
= &proc_dointvec
,
1261 #ifdef CONFIG_DNOTIFY
1263 .ctl_name
= FS_DIR_NOTIFY
,
1264 .procname
= "dir-notify-enable",
1265 .data
= &dir_notify_enable
,
1266 .maxlen
= sizeof(int),
1268 .proc_handler
= &proc_dointvec
,
1272 #ifdef CONFIG_FILE_LOCKING
1274 .ctl_name
= FS_LEASE_TIME
,
1275 .procname
= "lease-break-time",
1276 .data
= &lease_break_time
,
1277 .maxlen
= sizeof(int),
1279 .proc_handler
= &proc_dointvec_minmax
,
1280 .strategy
= &sysctl_intvec
,
1286 .procname
= "aio-nr",
1288 .maxlen
= sizeof(aio_nr
),
1290 .proc_handler
= &proc_doulongvec_minmax
,
1293 .procname
= "aio-max-nr",
1294 .data
= &aio_max_nr
,
1295 .maxlen
= sizeof(aio_max_nr
),
1297 .proc_handler
= &proc_doulongvec_minmax
,
1299 #ifdef CONFIG_INOTIFY_USER
1301 .ctl_name
= FS_INOTIFY
,
1302 .procname
= "inotify",
1304 .child
= inotify_table
,
1309 .ctl_name
= KERN_SETUID_DUMPABLE
,
1310 .procname
= "suid_dumpable",
1311 .data
= &suid_dumpable
,
1312 .maxlen
= sizeof(int),
1314 .proc_handler
= &proc_dointvec
,
1316 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1318 .ctl_name
= CTL_UNNUMBERED
,
1319 .procname
= "binfmt_misc",
1321 .child
= binfmt_misc_table
,
1325 * NOTE: do not add new entries to this table unless you have read
1326 * Documentation/sysctl/ctl_unnumbered.txt
1331 static struct ctl_table debug_table
[] = {
1332 #if defined(CONFIG_X86) || defined(CONFIG_PPC)
1334 .ctl_name
= CTL_UNNUMBERED
,
1335 .procname
= "exception-trace",
1336 .data
= &show_unhandled_signals
,
1337 .maxlen
= sizeof(int),
1339 .proc_handler
= proc_dointvec
1345 static struct ctl_table dev_table
[] = {
1349 static DEFINE_SPINLOCK(sysctl_lock
);
1351 /* called under sysctl_lock */
1352 static int use_table(struct ctl_table_header
*p
)
1354 if (unlikely(p
->unregistering
))
1360 /* called under sysctl_lock */
1361 static void unuse_table(struct ctl_table_header
*p
)
1364 if (unlikely(p
->unregistering
))
1365 complete(p
->unregistering
);
1368 /* called under sysctl_lock, will reacquire if has to wait */
1369 static void start_unregistering(struct ctl_table_header
*p
)
1372 * if p->used is 0, nobody will ever touch that entry again;
1373 * we'll eliminate all paths to it before dropping sysctl_lock
1375 if (unlikely(p
->used
)) {
1376 struct completion wait
;
1377 init_completion(&wait
);
1378 p
->unregistering
= &wait
;
1379 spin_unlock(&sysctl_lock
);
1380 wait_for_completion(&wait
);
1381 spin_lock(&sysctl_lock
);
1383 /* anything non-NULL; we'll never dereference it */
1384 p
->unregistering
= ERR_PTR(-EINVAL
);
1387 * do not remove from the list until nobody holds it; walking the
1388 * list in do_sysctl() relies on that.
1390 list_del_init(&p
->ctl_entry
);
1393 void sysctl_head_get(struct ctl_table_header
*head
)
1395 spin_lock(&sysctl_lock
);
1397 spin_unlock(&sysctl_lock
);
1400 void sysctl_head_put(struct ctl_table_header
*head
)
1402 spin_lock(&sysctl_lock
);
1405 spin_unlock(&sysctl_lock
);
1408 struct ctl_table_header
*sysctl_head_grab(struct ctl_table_header
*head
)
1412 spin_lock(&sysctl_lock
);
1413 if (!use_table(head
))
1414 head
= ERR_PTR(-ENOENT
);
1415 spin_unlock(&sysctl_lock
);
1419 void sysctl_head_finish(struct ctl_table_header
*head
)
1423 spin_lock(&sysctl_lock
);
1425 spin_unlock(&sysctl_lock
);
1428 static struct ctl_table_set
*
1429 lookup_header_set(struct ctl_table_root
*root
, struct nsproxy
*namespaces
)
1431 struct ctl_table_set
*set
= &root
->default_set
;
1433 set
= root
->lookup(root
, namespaces
);
1437 static struct list_head
*
1438 lookup_header_list(struct ctl_table_root
*root
, struct nsproxy
*namespaces
)
1440 struct ctl_table_set
*set
= lookup_header_set(root
, namespaces
);
1444 struct ctl_table_header
*__sysctl_head_next(struct nsproxy
*namespaces
,
1445 struct ctl_table_header
*prev
)
1447 struct ctl_table_root
*root
;
1448 struct list_head
*header_list
;
1449 struct ctl_table_header
*head
;
1450 struct list_head
*tmp
;
1452 spin_lock(&sysctl_lock
);
1455 tmp
= &prev
->ctl_entry
;
1459 tmp
= &root_table_header
.ctl_entry
;
1461 head
= list_entry(tmp
, struct ctl_table_header
, ctl_entry
);
1463 if (!use_table(head
))
1465 spin_unlock(&sysctl_lock
);
1470 header_list
= lookup_header_list(root
, namespaces
);
1471 if (tmp
!= header_list
)
1475 root
= list_entry(root
->root_list
.next
,
1476 struct ctl_table_root
, root_list
);
1477 if (root
== &sysctl_table_root
)
1479 header_list
= lookup_header_list(root
, namespaces
);
1480 } while (list_empty(header_list
));
1481 tmp
= header_list
->next
;
1484 spin_unlock(&sysctl_lock
);
1488 struct ctl_table_header
*sysctl_head_next(struct ctl_table_header
*prev
)
1490 return __sysctl_head_next(current
->nsproxy
, prev
);
1493 void register_sysctl_root(struct ctl_table_root
*root
)
1495 spin_lock(&sysctl_lock
);
1496 list_add_tail(&root
->root_list
, &sysctl_table_root
.root_list
);
1497 spin_unlock(&sysctl_lock
);
1500 #ifdef CONFIG_SYSCTL_SYSCALL
1501 /* Perform the actual read/write of a sysctl table entry. */
1502 static int do_sysctl_strategy(struct ctl_table_root
*root
,
1503 struct ctl_table
*table
,
1504 int __user
*name
, int nlen
,
1505 void __user
*oldval
, size_t __user
*oldlenp
,
1506 void __user
*newval
, size_t newlen
)
1514 if (sysctl_perm(root
, table
, op
))
1517 if (table
->strategy
) {
1518 rc
= table
->strategy(table
, name
, nlen
, oldval
, oldlenp
,
1526 /* If there is no strategy routine, or if the strategy returns
1527 * zero, proceed with automatic r/w */
1528 if (table
->data
&& table
->maxlen
) {
1529 rc
= sysctl_data(table
, name
, nlen
, oldval
, oldlenp
,
1537 static int parse_table(int __user
*name
, int nlen
,
1538 void __user
*oldval
, size_t __user
*oldlenp
,
1539 void __user
*newval
, size_t newlen
,
1540 struct ctl_table_root
*root
,
1541 struct ctl_table
*table
)
1547 if (get_user(n
, name
))
1549 for ( ; table
->ctl_name
|| table
->procname
; table
++) {
1550 if (!table
->ctl_name
)
1552 if (n
== table
->ctl_name
) {
1555 if (sysctl_perm(root
, table
, MAY_EXEC
))
1559 table
= table
->child
;
1562 error
= do_sysctl_strategy(root
, table
, name
, nlen
,
1571 int do_sysctl(int __user
*name
, int nlen
, void __user
*oldval
, size_t __user
*oldlenp
,
1572 void __user
*newval
, size_t newlen
)
1574 struct ctl_table_header
*head
;
1575 int error
= -ENOTDIR
;
1577 if (nlen
<= 0 || nlen
>= CTL_MAXNAME
)
1581 if (!oldlenp
|| get_user(old_len
, oldlenp
))
1585 for (head
= sysctl_head_next(NULL
); head
;
1586 head
= sysctl_head_next(head
)) {
1587 error
= parse_table(name
, nlen
, oldval
, oldlenp
,
1589 head
->root
, head
->ctl_table
);
1590 if (error
!= -ENOTDIR
) {
1591 sysctl_head_finish(head
);
1598 asmlinkage
long sys_sysctl(struct __sysctl_args __user
*args
)
1600 struct __sysctl_args tmp
;
1603 if (copy_from_user(&tmp
, args
, sizeof(tmp
)))
1606 error
= deprecated_sysctl_warning(&tmp
);
1611 error
= do_sysctl(tmp
.name
, tmp
.nlen
, tmp
.oldval
, tmp
.oldlenp
,
1612 tmp
.newval
, tmp
.newlen
);
1617 #endif /* CONFIG_SYSCTL_SYSCALL */
1620 * sysctl_perm does NOT grant the superuser all rights automatically, because
1621 * some sysctl variables are readonly even to root.
1624 static int test_perm(int mode
, int op
)
1628 else if (in_egroup_p(0))
1630 if ((op
& ~mode
& (MAY_READ
|MAY_WRITE
|MAY_EXEC
)) == 0)
1635 int sysctl_perm(struct ctl_table_root
*root
, struct ctl_table
*table
, int op
)
1640 error
= security_sysctl(table
, op
& (MAY_READ
| MAY_WRITE
| MAY_EXEC
));
1644 if (root
->permissions
)
1645 mode
= root
->permissions(root
, current
->nsproxy
, table
);
1649 return test_perm(mode
, op
);
1652 static void sysctl_set_parent(struct ctl_table
*parent
, struct ctl_table
*table
)
1654 for (; table
->ctl_name
|| table
->procname
; table
++) {
1655 table
->parent
= parent
;
1657 sysctl_set_parent(table
, table
->child
);
1661 static __init
int sysctl_init(void)
1663 sysctl_set_parent(NULL
, root_table
);
1664 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1667 err
= sysctl_check_table(current
->nsproxy
, root_table
);
1673 core_initcall(sysctl_init
);
1675 static struct ctl_table
*is_branch_in(struct ctl_table
*branch
,
1676 struct ctl_table
*table
)
1678 struct ctl_table
*p
;
1679 const char *s
= branch
->procname
;
1681 /* branch should have named subdirectory as its first element */
1682 if (!s
|| !branch
->child
)
1685 /* ... and nothing else */
1686 if (branch
[1].procname
|| branch
[1].ctl_name
)
1689 /* table should contain subdirectory with the same name */
1690 for (p
= table
; p
->procname
|| p
->ctl_name
; p
++) {
1693 if (p
->procname
&& strcmp(p
->procname
, s
) == 0)
1699 /* see if attaching q to p would be an improvement */
1700 static void try_attach(struct ctl_table_header
*p
, struct ctl_table_header
*q
)
1702 struct ctl_table
*to
= p
->ctl_table
, *by
= q
->ctl_table
;
1703 struct ctl_table
*next
;
1705 int not_in_parent
= !p
->attached_by
;
1707 while ((next
= is_branch_in(by
, to
)) != NULL
) {
1708 if (by
== q
->attached_by
)
1710 if (to
== p
->attached_by
)
1716 if (is_better
&& not_in_parent
) {
1717 q
->attached_by
= by
;
1718 q
->attached_to
= to
;
1724 * __register_sysctl_paths - register a sysctl hierarchy
1725 * @root: List of sysctl headers to register on
1726 * @namespaces: Data to compute which lists of sysctl entries are visible
1727 * @path: The path to the directory the sysctl table is in.
1728 * @table: the top-level table structure
1730 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1731 * array. A completely 0 filled entry terminates the table.
1733 * The members of the &struct ctl_table structure are used as follows:
1735 * ctl_name - This is the numeric sysctl value used by sysctl(2). The number
1736 * must be unique within that level of sysctl
1738 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1739 * enter a sysctl file
1741 * data - a pointer to data for use by proc_handler
1743 * maxlen - the maximum size in bytes of the data
1745 * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1747 * child - a pointer to the child sysctl table if this entry is a directory, or
1750 * proc_handler - the text handler routine (described below)
1752 * strategy - the strategy routine (described below)
1754 * de - for internal use by the sysctl routines
1756 * extra1, extra2 - extra pointers usable by the proc handler routines
1758 * Leaf nodes in the sysctl tree will be represented by a single file
1759 * under /proc; non-leaf nodes will be represented by directories.
1761 * sysctl(2) can automatically manage read and write requests through
1762 * the sysctl table. The data and maxlen fields of the ctl_table
1763 * struct enable minimal validation of the values being written to be
1764 * performed, and the mode field allows minimal authentication.
1766 * More sophisticated management can be enabled by the provision of a
1767 * strategy routine with the table entry. This will be called before
1768 * any automatic read or write of the data is performed.
1770 * The strategy routine may return
1772 * < 0 - Error occurred (error is passed to user process)
1774 * 0 - OK - proceed with automatic read or write.
1776 * > 0 - OK - read or write has been done by the strategy routine, so
1777 * return immediately.
1779 * There must be a proc_handler routine for any terminal nodes
1780 * mirrored under /proc/sys (non-terminals are handled by a built-in
1781 * directory handler). Several default handlers are available to
1782 * cover common cases -
1784 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1785 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1786 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1788 * It is the handler's job to read the input buffer from user memory
1789 * and process it. The handler should return 0 on success.
1791 * This routine returns %NULL on a failure to register, and a pointer
1792 * to the table header on success.
1794 struct ctl_table_header
*__register_sysctl_paths(
1795 struct ctl_table_root
*root
,
1796 struct nsproxy
*namespaces
,
1797 const struct ctl_path
*path
, struct ctl_table
*table
)
1799 struct ctl_table_header
*header
;
1800 struct ctl_table
*new, **prevp
;
1801 unsigned int n
, npath
;
1802 struct ctl_table_set
*set
;
1804 /* Count the path components */
1805 for (npath
= 0; path
[npath
].ctl_name
|| path
[npath
].procname
; ++npath
)
1809 * For each path component, allocate a 2-element ctl_table array.
1810 * The first array element will be filled with the sysctl entry
1811 * for this, the second will be the sentinel (ctl_name == 0).
1813 * We allocate everything in one go so that we don't have to
1814 * worry about freeing additional memory in unregister_sysctl_table.
1816 header
= kzalloc(sizeof(struct ctl_table_header
) +
1817 (2 * npath
* sizeof(struct ctl_table
)), GFP_KERNEL
);
1821 new = (struct ctl_table
*) (header
+ 1);
1823 /* Now connect the dots */
1824 prevp
= &header
->ctl_table
;
1825 for (n
= 0; n
< npath
; ++n
, ++path
) {
1826 /* Copy the procname */
1827 new->procname
= path
->procname
;
1828 new->ctl_name
= path
->ctl_name
;
1832 prevp
= &new->child
;
1837 header
->ctl_table_arg
= table
;
1839 INIT_LIST_HEAD(&header
->ctl_entry
);
1841 header
->unregistering
= NULL
;
1842 header
->root
= root
;
1843 sysctl_set_parent(NULL
, header
->ctl_table
);
1845 #ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1846 if (sysctl_check_table(namespaces
, header
->ctl_table
)) {
1851 spin_lock(&sysctl_lock
);
1852 header
->set
= lookup_header_set(root
, namespaces
);
1853 header
->attached_by
= header
->ctl_table
;
1854 header
->attached_to
= root_table
;
1855 header
->parent
= &root_table_header
;
1856 for (set
= header
->set
; set
; set
= set
->parent
) {
1857 struct ctl_table_header
*p
;
1858 list_for_each_entry(p
, &set
->list
, ctl_entry
) {
1859 if (p
->unregistering
)
1861 try_attach(p
, header
);
1864 header
->parent
->count
++;
1865 list_add_tail(&header
->ctl_entry
, &header
->set
->list
);
1866 spin_unlock(&sysctl_lock
);
1872 * register_sysctl_table_path - register a sysctl table hierarchy
1873 * @path: The path to the directory the sysctl table is in.
1874 * @table: the top-level table structure
1876 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1877 * array. A completely 0 filled entry terminates the table.
1879 * See __register_sysctl_paths for more details.
1881 struct ctl_table_header
*register_sysctl_paths(const struct ctl_path
*path
,
1882 struct ctl_table
*table
)
1884 return __register_sysctl_paths(&sysctl_table_root
, current
->nsproxy
,
1889 * register_sysctl_table - register a sysctl table hierarchy
1890 * @table: the top-level table structure
1892 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1893 * array. A completely 0 filled entry terminates the table.
1895 * See register_sysctl_paths for more details.
1897 struct ctl_table_header
*register_sysctl_table(struct ctl_table
*table
)
1899 static const struct ctl_path null_path
[] = { {} };
1901 return register_sysctl_paths(null_path
, table
);
1905 * unregister_sysctl_table - unregister a sysctl table hierarchy
1906 * @header: the header returned from register_sysctl_table
1908 * Unregisters the sysctl table and all children. proc entries may not
1909 * actually be removed until they are no longer used by anyone.
1911 void unregister_sysctl_table(struct ctl_table_header
* header
)
1918 spin_lock(&sysctl_lock
);
1919 start_unregistering(header
);
1920 if (!--header
->parent
->count
) {
1922 kfree(header
->parent
);
1924 if (!--header
->count
)
1926 spin_unlock(&sysctl_lock
);
1929 int sysctl_is_seen(struct ctl_table_header
*p
)
1931 struct ctl_table_set
*set
= p
->set
;
1933 spin_lock(&sysctl_lock
);
1934 if (p
->unregistering
)
1936 else if (!set
->is_seen
)
1939 res
= set
->is_seen(set
);
1940 spin_unlock(&sysctl_lock
);
1944 void setup_sysctl_set(struct ctl_table_set
*p
,
1945 struct ctl_table_set
*parent
,
1946 int (*is_seen
)(struct ctl_table_set
*))
1948 INIT_LIST_HEAD(&p
->list
);
1949 p
->parent
= parent
? parent
: &sysctl_table_root
.default_set
;
1950 p
->is_seen
= is_seen
;
1953 #else /* !CONFIG_SYSCTL */
1954 struct ctl_table_header
*register_sysctl_table(struct ctl_table
* table
)
1959 struct ctl_table_header
*register_sysctl_paths(const struct ctl_path
*path
,
1960 struct ctl_table
*table
)
1965 void unregister_sysctl_table(struct ctl_table_header
* table
)
1969 void setup_sysctl_set(struct ctl_table_set
*p
,
1970 struct ctl_table_set
*parent
,
1971 int (*is_seen
)(struct ctl_table_set
*))
1975 void sysctl_head_put(struct ctl_table_header
*head
)
1979 #endif /* CONFIG_SYSCTL */
1985 #ifdef CONFIG_PROC_SYSCTL
1987 static int _proc_do_string(void* data
, int maxlen
, int write
,
1988 struct file
*filp
, void __user
*buffer
,
1989 size_t *lenp
, loff_t
*ppos
)
1995 if (!data
|| !maxlen
|| !*lenp
) {
2003 while (len
< *lenp
) {
2004 if (get_user(c
, p
++))
2006 if (c
== 0 || c
== '\n')
2012 if(copy_from_user(data
, buffer
, len
))
2014 ((char *) data
)[len
] = 0;
2032 if(copy_to_user(buffer
, data
, len
))
2035 if(put_user('\n', ((char __user
*) buffer
) + len
))
2046 * proc_dostring - read a string sysctl
2047 * @table: the sysctl table
2048 * @write: %TRUE if this is a write to the sysctl file
2049 * @filp: the file structure
2050 * @buffer: the user buffer
2051 * @lenp: the size of the user buffer
2052 * @ppos: file position
2054 * Reads/writes a string from/to the user buffer. If the kernel
2055 * buffer provided is not large enough to hold the string, the
2056 * string is truncated. The copied string is %NULL-terminated.
2057 * If the string is being read by the user process, it is copied
2058 * and a newline '\n' is added. It is truncated if the buffer is
2061 * Returns 0 on success.
2063 int proc_dostring(struct ctl_table
*table
, int write
, struct file
*filp
,
2064 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2066 return _proc_do_string(table
->data
, table
->maxlen
, write
, filp
,
2067 buffer
, lenp
, ppos
);
2071 static int do_proc_dointvec_conv(int *negp
, unsigned long *lvalp
,
2073 int write
, void *data
)
2076 *valp
= *negp
? -*lvalp
: *lvalp
;
2081 *lvalp
= (unsigned long)-val
;
2084 *lvalp
= (unsigned long)val
;
2090 static int __do_proc_dointvec(void *tbl_data
, struct ctl_table
*table
,
2091 int write
, struct file
*filp
, void __user
*buffer
,
2092 size_t *lenp
, loff_t
*ppos
,
2093 int (*conv
)(int *negp
, unsigned long *lvalp
, int *valp
,
2094 int write
, void *data
),
2097 #define TMPBUFLEN 21
2098 int *i
, vleft
, first
=1, neg
, val
;
2102 char buf
[TMPBUFLEN
], *p
;
2103 char __user
*s
= buffer
;
2105 if (!tbl_data
|| !table
->maxlen
|| !*lenp
||
2106 (*ppos
&& !write
)) {
2111 i
= (int *) tbl_data
;
2112 vleft
= table
->maxlen
/ sizeof(*i
);
2116 conv
= do_proc_dointvec_conv
;
2118 for (; left
&& vleft
--; i
++, first
=0) {
2133 if (len
> sizeof(buf
) - 1)
2134 len
= sizeof(buf
) - 1;
2135 if (copy_from_user(buf
, s
, len
))
2139 if (*p
== '-' && left
> 1) {
2143 if (*p
< '0' || *p
> '9')
2146 lval
= simple_strtoul(p
, &p
, 0);
2149 if ((len
< left
) && *p
&& !isspace(*p
))
2156 if (conv(&neg
, &lval
, i
, 1, data
))
2163 if (conv(&neg
, &lval
, i
, 0, data
))
2166 sprintf(p
, "%s%lu", neg
? "-" : "", lval
);
2170 if(copy_to_user(s
, buf
, len
))
2177 if (!write
&& !first
&& left
) {
2178 if(put_user('\n', s
))
2185 if (get_user(c
, s
++))
2200 static int do_proc_dointvec(struct ctl_table
*table
, int write
, struct file
*filp
,
2201 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
,
2202 int (*conv
)(int *negp
, unsigned long *lvalp
, int *valp
,
2203 int write
, void *data
),
2206 return __do_proc_dointvec(table
->data
, table
, write
, filp
,
2207 buffer
, lenp
, ppos
, conv
, data
);
2211 * proc_dointvec - read a vector of integers
2212 * @table: the sysctl table
2213 * @write: %TRUE if this is a write to the sysctl file
2214 * @filp: the file structure
2215 * @buffer: the user buffer
2216 * @lenp: the size of the user buffer
2217 * @ppos: file position
2219 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2220 * values from/to the user buffer, treated as an ASCII string.
2222 * Returns 0 on success.
2224 int proc_dointvec(struct ctl_table
*table
, int write
, struct file
*filp
,
2225 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2227 return do_proc_dointvec(table
,write
,filp
,buffer
,lenp
,ppos
,
2235 static int do_proc_dointvec_bset_conv(int *negp
, unsigned long *lvalp
,
2237 int write
, void *data
)
2239 int op
= *(int *)data
;
2241 int val
= *negp
? -*lvalp
: *lvalp
;
2243 case OP_SET
: *valp
= val
; break;
2244 case OP_AND
: *valp
&= val
; break;
2245 case OP_OR
: *valp
|= val
; break;
2251 *lvalp
= (unsigned long)-val
;
2254 *lvalp
= (unsigned long)val
;
2261 * Taint values can only be increased
2263 static int proc_dointvec_taint(struct ctl_table
*table
, int write
, struct file
*filp
,
2264 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2268 if (write
&& !capable(CAP_SYS_ADMIN
))
2272 return do_proc_dointvec(table
,write
,filp
,buffer
,lenp
,ppos
,
2273 do_proc_dointvec_bset_conv
,&op
);
2276 struct do_proc_dointvec_minmax_conv_param
{
2281 static int do_proc_dointvec_minmax_conv(int *negp
, unsigned long *lvalp
,
2283 int write
, void *data
)
2285 struct do_proc_dointvec_minmax_conv_param
*param
= data
;
2287 int val
= *negp
? -*lvalp
: *lvalp
;
2288 if ((param
->min
&& *param
->min
> val
) ||
2289 (param
->max
&& *param
->max
< val
))
2296 *lvalp
= (unsigned long)-val
;
2299 *lvalp
= (unsigned long)val
;
2306 * proc_dointvec_minmax - read a vector of integers with min/max values
2307 * @table: the sysctl table
2308 * @write: %TRUE if this is a write to the sysctl file
2309 * @filp: the file structure
2310 * @buffer: the user buffer
2311 * @lenp: the size of the user buffer
2312 * @ppos: file position
2314 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2315 * values from/to the user buffer, treated as an ASCII string.
2317 * This routine will ensure the values are within the range specified by
2318 * table->extra1 (min) and table->extra2 (max).
2320 * Returns 0 on success.
2322 int proc_dointvec_minmax(struct ctl_table
*table
, int write
, struct file
*filp
,
2323 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2325 struct do_proc_dointvec_minmax_conv_param param
= {
2326 .min
= (int *) table
->extra1
,
2327 .max
= (int *) table
->extra2
,
2329 return do_proc_dointvec(table
, write
, filp
, buffer
, lenp
, ppos
,
2330 do_proc_dointvec_minmax_conv
, ¶m
);
2333 static int __do_proc_doulongvec_minmax(void *data
, struct ctl_table
*table
, int write
,
2335 void __user
*buffer
,
2336 size_t *lenp
, loff_t
*ppos
,
2337 unsigned long convmul
,
2338 unsigned long convdiv
)
2340 #define TMPBUFLEN 21
2341 unsigned long *i
, *min
, *max
, val
;
2342 int vleft
, first
=1, neg
;
2344 char buf
[TMPBUFLEN
], *p
;
2345 char __user
*s
= buffer
;
2347 if (!data
|| !table
->maxlen
|| !*lenp
||
2348 (*ppos
&& !write
)) {
2353 i
= (unsigned long *) data
;
2354 min
= (unsigned long *) table
->extra1
;
2355 max
= (unsigned long *) table
->extra2
;
2356 vleft
= table
->maxlen
/ sizeof(unsigned long);
2359 for (; left
&& vleft
--; i
++, min
++, max
++, first
=0) {
2374 if (len
> TMPBUFLEN
-1)
2376 if (copy_from_user(buf
, s
, len
))
2380 if (*p
== '-' && left
> 1) {
2384 if (*p
< '0' || *p
> '9')
2386 val
= simple_strtoul(p
, &p
, 0) * convmul
/ convdiv
;
2388 if ((len
< left
) && *p
&& !isspace(*p
))
2397 if ((min
&& val
< *min
) || (max
&& val
> *max
))
2404 sprintf(p
, "%lu", convdiv
* (*i
) / convmul
);
2408 if(copy_to_user(s
, buf
, len
))
2415 if (!write
&& !first
&& left
) {
2416 if(put_user('\n', s
))
2423 if (get_user(c
, s
++))
2438 static int do_proc_doulongvec_minmax(struct ctl_table
*table
, int write
,
2440 void __user
*buffer
,
2441 size_t *lenp
, loff_t
*ppos
,
2442 unsigned long convmul
,
2443 unsigned long convdiv
)
2445 return __do_proc_doulongvec_minmax(table
->data
, table
, write
,
2446 filp
, buffer
, lenp
, ppos
, convmul
, convdiv
);
2450 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2451 * @table: the sysctl table
2452 * @write: %TRUE if this is a write to the sysctl file
2453 * @filp: the file structure
2454 * @buffer: the user buffer
2455 * @lenp: the size of the user buffer
2456 * @ppos: file position
2458 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2459 * values from/to the user buffer, treated as an ASCII string.
2461 * This routine will ensure the values are within the range specified by
2462 * table->extra1 (min) and table->extra2 (max).
2464 * Returns 0 on success.
2466 int proc_doulongvec_minmax(struct ctl_table
*table
, int write
, struct file
*filp
,
2467 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2469 return do_proc_doulongvec_minmax(table
, write
, filp
, buffer
, lenp
, ppos
, 1l, 1l);
2473 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2474 * @table: the sysctl table
2475 * @write: %TRUE if this is a write to the sysctl file
2476 * @filp: the file structure
2477 * @buffer: the user buffer
2478 * @lenp: the size of the user buffer
2479 * @ppos: file position
2481 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2482 * values from/to the user buffer, treated as an ASCII string. The values
2483 * are treated as milliseconds, and converted to jiffies when they are stored.
2485 * This routine will ensure the values are within the range specified by
2486 * table->extra1 (min) and table->extra2 (max).
2488 * Returns 0 on success.
2490 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table
*table
, int write
,
2492 void __user
*buffer
,
2493 size_t *lenp
, loff_t
*ppos
)
2495 return do_proc_doulongvec_minmax(table
, write
, filp
, buffer
,
2496 lenp
, ppos
, HZ
, 1000l);
2500 static int do_proc_dointvec_jiffies_conv(int *negp
, unsigned long *lvalp
,
2502 int write
, void *data
)
2505 if (*lvalp
> LONG_MAX
/ HZ
)
2507 *valp
= *negp
? -(*lvalp
*HZ
) : (*lvalp
*HZ
);
2513 lval
= (unsigned long)-val
;
2516 lval
= (unsigned long)val
;
2523 static int do_proc_dointvec_userhz_jiffies_conv(int *negp
, unsigned long *lvalp
,
2525 int write
, void *data
)
2528 if (USER_HZ
< HZ
&& *lvalp
> (LONG_MAX
/ HZ
) * USER_HZ
)
2530 *valp
= clock_t_to_jiffies(*negp
? -*lvalp
: *lvalp
);
2536 lval
= (unsigned long)-val
;
2539 lval
= (unsigned long)val
;
2541 *lvalp
= jiffies_to_clock_t(lval
);
2546 static int do_proc_dointvec_ms_jiffies_conv(int *negp
, unsigned long *lvalp
,
2548 int write
, void *data
)
2551 *valp
= msecs_to_jiffies(*negp
? -*lvalp
: *lvalp
);
2557 lval
= (unsigned long)-val
;
2560 lval
= (unsigned long)val
;
2562 *lvalp
= jiffies_to_msecs(lval
);
2568 * proc_dointvec_jiffies - read a vector of integers as seconds
2569 * @table: the sysctl table
2570 * @write: %TRUE if this is a write to the sysctl file
2571 * @filp: the file structure
2572 * @buffer: the user buffer
2573 * @lenp: the size of the user buffer
2574 * @ppos: file position
2576 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2577 * values from/to the user buffer, treated as an ASCII string.
2578 * The values read are assumed to be in seconds, and are converted into
2581 * Returns 0 on success.
2583 int proc_dointvec_jiffies(struct ctl_table
*table
, int write
, struct file
*filp
,
2584 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2586 return do_proc_dointvec(table
,write
,filp
,buffer
,lenp
,ppos
,
2587 do_proc_dointvec_jiffies_conv
,NULL
);
2591 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2592 * @table: the sysctl table
2593 * @write: %TRUE if this is a write to the sysctl file
2594 * @filp: the file structure
2595 * @buffer: the user buffer
2596 * @lenp: the size of the user buffer
2597 * @ppos: pointer to the file position
2599 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2600 * values from/to the user buffer, treated as an ASCII string.
2601 * The values read are assumed to be in 1/USER_HZ seconds, and
2602 * are converted into jiffies.
2604 * Returns 0 on success.
2606 int proc_dointvec_userhz_jiffies(struct ctl_table
*table
, int write
, struct file
*filp
,
2607 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2609 return do_proc_dointvec(table
,write
,filp
,buffer
,lenp
,ppos
,
2610 do_proc_dointvec_userhz_jiffies_conv
,NULL
);
2614 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2615 * @table: the sysctl table
2616 * @write: %TRUE if this is a write to the sysctl file
2617 * @filp: the file structure
2618 * @buffer: the user buffer
2619 * @lenp: the size of the user buffer
2620 * @ppos: file position
2621 * @ppos: the current position in the file
2623 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2624 * values from/to the user buffer, treated as an ASCII string.
2625 * The values read are assumed to be in 1/1000 seconds, and
2626 * are converted into jiffies.
2628 * Returns 0 on success.
2630 int proc_dointvec_ms_jiffies(struct ctl_table
*table
, int write
, struct file
*filp
,
2631 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2633 return do_proc_dointvec(table
, write
, filp
, buffer
, lenp
, ppos
,
2634 do_proc_dointvec_ms_jiffies_conv
, NULL
);
2637 static int proc_do_cad_pid(struct ctl_table
*table
, int write
, struct file
*filp
,
2638 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2640 struct pid
*new_pid
;
2644 tmp
= pid_vnr(cad_pid
);
2646 r
= __do_proc_dointvec(&tmp
, table
, write
, filp
, buffer
,
2647 lenp
, ppos
, NULL
, NULL
);
2651 new_pid
= find_get_pid(tmp
);
2655 put_pid(xchg(&cad_pid
, new_pid
));
2659 #else /* CONFIG_PROC_FS */
2661 int proc_dostring(struct ctl_table
*table
, int write
, struct file
*filp
,
2662 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2667 int proc_dointvec(struct ctl_table
*table
, int write
, struct file
*filp
,
2668 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2673 int proc_dointvec_minmax(struct ctl_table
*table
, int write
, struct file
*filp
,
2674 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2679 int proc_dointvec_jiffies(struct ctl_table
*table
, int write
, struct file
*filp
,
2680 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2685 int proc_dointvec_userhz_jiffies(struct ctl_table
*table
, int write
, struct file
*filp
,
2686 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2691 int proc_dointvec_ms_jiffies(struct ctl_table
*table
, int write
, struct file
*filp
,
2692 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2697 int proc_doulongvec_minmax(struct ctl_table
*table
, int write
, struct file
*filp
,
2698 void __user
*buffer
, size_t *lenp
, loff_t
*ppos
)
2703 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table
*table
, int write
,
2705 void __user
*buffer
,
2706 size_t *lenp
, loff_t
*ppos
)
2712 #endif /* CONFIG_PROC_FS */
2715 #ifdef CONFIG_SYSCTL_SYSCALL
2717 * General sysctl support routines
2720 /* The generic sysctl data routine (used if no strategy routine supplied) */
2721 int sysctl_data(struct ctl_table
*table
, int __user
*name
, int nlen
,
2722 void __user
*oldval
, size_t __user
*oldlenp
,
2723 void __user
*newval
, size_t newlen
)
2727 /* Get out of I don't have a variable */
2728 if (!table
->data
|| !table
->maxlen
)
2731 if (oldval
&& oldlenp
) {
2732 if (get_user(len
, oldlenp
))
2735 if (len
> table
->maxlen
)
2736 len
= table
->maxlen
;
2737 if (copy_to_user(oldval
, table
->data
, len
))
2739 if (put_user(len
, oldlenp
))
2744 if (newval
&& newlen
) {
2745 if (newlen
> table
->maxlen
)
2746 newlen
= table
->maxlen
;
2748 if (copy_from_user(table
->data
, newval
, newlen
))
2754 /* The generic string strategy routine: */
2755 int sysctl_string(struct ctl_table
*table
, int __user
*name
, int nlen
,
2756 void __user
*oldval
, size_t __user
*oldlenp
,
2757 void __user
*newval
, size_t newlen
)
2759 if (!table
->data
|| !table
->maxlen
)
2762 if (oldval
&& oldlenp
) {
2764 if (get_user(bufsize
, oldlenp
))
2767 size_t len
= strlen(table
->data
), copied
;
2769 /* This shouldn't trigger for a well-formed sysctl */
2770 if (len
> table
->maxlen
)
2771 len
= table
->maxlen
;
2773 /* Copy up to a max of bufsize-1 bytes of the string */
2774 copied
= (len
>= bufsize
) ? bufsize
- 1 : len
;
2776 if (copy_to_user(oldval
, table
->data
, copied
) ||
2777 put_user(0, (char __user
*)(oldval
+ copied
)))
2779 if (put_user(len
, oldlenp
))
2783 if (newval
&& newlen
) {
2784 size_t len
= newlen
;
2785 if (len
> table
->maxlen
)
2786 len
= table
->maxlen
;
2787 if(copy_from_user(table
->data
, newval
, len
))
2789 if (len
== table
->maxlen
)
2791 ((char *) table
->data
)[len
] = 0;
2797 * This function makes sure that all of the integers in the vector
2798 * are between the minimum and maximum values given in the arrays
2799 * table->extra1 and table->extra2, respectively.
2801 int sysctl_intvec(struct ctl_table
*table
, int __user
*name
, int nlen
,
2802 void __user
*oldval
, size_t __user
*oldlenp
,
2803 void __user
*newval
, size_t newlen
)
2806 if (newval
&& newlen
) {
2807 int __user
*vec
= (int __user
*) newval
;
2808 int *min
= (int *) table
->extra1
;
2809 int *max
= (int *) table
->extra2
;
2813 if (newlen
% sizeof(int) != 0)
2816 if (!table
->extra1
&& !table
->extra2
)
2819 if (newlen
> table
->maxlen
)
2820 newlen
= table
->maxlen
;
2821 length
= newlen
/ sizeof(int);
2823 for (i
= 0; i
< length
; i
++) {
2825 if (get_user(value
, vec
+ i
))
2827 if (min
&& value
< min
[i
])
2829 if (max
&& value
> max
[i
])
2836 /* Strategy function to convert jiffies to seconds */
2837 int sysctl_jiffies(struct ctl_table
*table
, int __user
*name
, int nlen
,
2838 void __user
*oldval
, size_t __user
*oldlenp
,
2839 void __user
*newval
, size_t newlen
)
2841 if (oldval
&& oldlenp
) {
2844 if (get_user(olen
, oldlenp
))
2849 if (olen
< sizeof(int))
2852 val
= *(int *)(table
->data
) / HZ
;
2853 if (put_user(val
, (int __user
*)oldval
))
2855 if (put_user(sizeof(int), oldlenp
))
2859 if (newval
&& newlen
) {
2861 if (newlen
!= sizeof(int))
2863 if (get_user(new, (int __user
*)newval
))
2865 *(int *)(table
->data
) = new*HZ
;
2870 /* Strategy function to convert jiffies to seconds */
2871 int sysctl_ms_jiffies(struct ctl_table
*table
, int __user
*name
, int nlen
,
2872 void __user
*oldval
, size_t __user
*oldlenp
,
2873 void __user
*newval
, size_t newlen
)
2875 if (oldval
&& oldlenp
) {
2878 if (get_user(olen
, oldlenp
))
2883 if (olen
< sizeof(int))
2886 val
= jiffies_to_msecs(*(int *)(table
->data
));
2887 if (put_user(val
, (int __user
*)oldval
))
2889 if (put_user(sizeof(int), oldlenp
))
2893 if (newval
&& newlen
) {
2895 if (newlen
!= sizeof(int))
2897 if (get_user(new, (int __user
*)newval
))
2899 *(int *)(table
->data
) = msecs_to_jiffies(new);
2906 #else /* CONFIG_SYSCTL_SYSCALL */
2909 asmlinkage
long sys_sysctl(struct __sysctl_args __user
*args
)
2911 struct __sysctl_args tmp
;
2914 if (copy_from_user(&tmp
, args
, sizeof(tmp
)))
2917 error
= deprecated_sysctl_warning(&tmp
);
2919 /* If no error reading the parameters then just -ENOSYS ... */
2926 int sysctl_data(struct ctl_table
*table
, int __user
*name
, int nlen
,
2927 void __user
*oldval
, size_t __user
*oldlenp
,
2928 void __user
*newval
, size_t newlen
)
2933 int sysctl_string(struct ctl_table
*table
, int __user
*name
, int nlen
,
2934 void __user
*oldval
, size_t __user
*oldlenp
,
2935 void __user
*newval
, size_t newlen
)
2940 int sysctl_intvec(struct ctl_table
*table
, int __user
*name
, int nlen
,
2941 void __user
*oldval
, size_t __user
*oldlenp
,
2942 void __user
*newval
, size_t newlen
)
2947 int sysctl_jiffies(struct ctl_table
*table
, int __user
*name
, int nlen
,
2948 void __user
*oldval
, size_t __user
*oldlenp
,
2949 void __user
*newval
, size_t newlen
)
2954 int sysctl_ms_jiffies(struct ctl_table
*table
, int __user
*name
, int nlen
,
2955 void __user
*oldval
, size_t __user
*oldlenp
,
2956 void __user
*newval
, size_t newlen
)
2961 #endif /* CONFIG_SYSCTL_SYSCALL */
2963 static int deprecated_sysctl_warning(struct __sysctl_args
*args
)
2965 static int msg_count
;
2966 int name
[CTL_MAXNAME
];
2969 /* Check args->nlen. */
2970 if (args
->nlen
< 0 || args
->nlen
> CTL_MAXNAME
)
2973 /* Read in the sysctl name for better debug message logging */
2974 for (i
= 0; i
< args
->nlen
; i
++)
2975 if (get_user(name
[i
], args
->name
+ i
))
2978 /* Ignore accesses to kernel.version */
2979 if ((args
->nlen
== 2) && (name
[0] == CTL_KERN
) && (name
[1] == KERN_VERSION
))
2982 if (msg_count
< 5) {
2985 "warning: process `%s' used the deprecated sysctl "
2986 "system call with ", current
->comm
);
2987 for (i
= 0; i
< args
->nlen
; i
++)
2988 printk("%d.", name
[i
]);
2995 * No sense putting this after each symbol definition, twice,
2996 * exception granted :-)
2998 EXPORT_SYMBOL(proc_dointvec
);
2999 EXPORT_SYMBOL(proc_dointvec_jiffies
);
3000 EXPORT_SYMBOL(proc_dointvec_minmax
);
3001 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies
);
3002 EXPORT_SYMBOL(proc_dointvec_ms_jiffies
);
3003 EXPORT_SYMBOL(proc_dostring
);
3004 EXPORT_SYMBOL(proc_doulongvec_minmax
);
3005 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax
);
3006 EXPORT_SYMBOL(register_sysctl_table
);
3007 EXPORT_SYMBOL(register_sysctl_paths
);
3008 EXPORT_SYMBOL(sysctl_intvec
);
3009 EXPORT_SYMBOL(sysctl_jiffies
);
3010 EXPORT_SYMBOL(sysctl_ms_jiffies
);
3011 EXPORT_SYMBOL(sysctl_string
);
3012 EXPORT_SYMBOL(sysctl_data
);
3013 EXPORT_SYMBOL(unregister_sysctl_table
);