blob: 965134bed6cd8d39e4b279bc6bb713b65e59cfae [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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
Linus Torvalds1da177e2005-04-16 15:20:36 -070021#include <linux/module.h>
22#include <linux/mm.h>
23#include <linux/swap.h>
24#include <linux/slab.h>
25#include <linux/sysctl.h>
Dave Youngd33ed522010-03-10 15:23:59 -080026#include <linux/signal.h>
Dan Rosenberg455cd5a2011-01-12 16:59:41 -080027#include <linux/printk.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070028#include <linux/proc_fs.h>
Andrew Morgan72c2d582007-10-18 03:05:59 -070029#include <linux/security.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070030#include <linux/ctype.h>
Vegard Nossumdfec0722008-04-04 00:51:41 +020031#include <linux/kmemcheck.h>
Adrian Bunk62239ac2007-07-17 04:03:45 -070032#include <linux/fs.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070033#include <linux/init.h>
34#include <linux/kernel.h>
Kay Sievers0296b222005-11-11 05:33:52 +010035#include <linux/kobject.h>
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -030036#include <linux/net.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070037#include <linux/sysrq.h>
38#include <linux/highuid.h>
39#include <linux/writeback.h>
Ingo Molnar3fff4c42009-09-22 16:18:09 +020040#include <linux/ratelimit.h>
Mel Gorman76ab0f52010-05-24 14:32:28 -070041#include <linux/compaction.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070042#include <linux/hugetlb.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070043#include <linux/initrd.h>
David Howells0b77f5b2008-04-29 01:01:32 -070044#include <linux/key.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070045#include <linux/times.h>
46#include <linux/limits.h>
47#include <linux/dcache.h>
Alexey Dobriyan6e006702010-01-20 22:27:56 +020048#include <linux/dnotify.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070049#include <linux/syscalls.h>
Adrian Bunkc748e132008-07-23 21:27:03 -070050#include <linux/vmstat.h>
Pavel Machekc255d842006-02-20 18:27:58 -080051#include <linux/nfs_fs.h>
52#include <linux/acpi.h>
Jeremy Fitzhardinge10a0a8d2007-07-17 18:37:02 -070053#include <linux/reboot.h>
Steven Rostedtb0fc4942008-05-12 21:20:43 +020054#include <linux/ftrace.h>
Ingo Molnarcdd6c482009-09-21 12:02:48 +020055#include <linux/perf_event.h>
Masami Hiramatsub2be84d2010-02-25 08:34:15 -050056#include <linux/kprobes.h>
Jens Axboeb492e952010-05-19 21:03:16 +020057#include <linux/pipe_fs_i.h>
David Rientjes8e4228e2010-08-09 17:18:56 -070058#include <linux/oom.h>
Eric Paris17f60a72011-04-01 17:07:50 -040059#include <linux/kmod.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070060
61#include <asm/uaccess.h>
62#include <asm/processor.h>
63
Andi Kleen29cbc782006-09-30 01:47:55 +020064#ifdef CONFIG_X86
65#include <asm/nmi.h>
Chuck Ebbert0741f4d2006-12-07 02:14:11 +010066#include <asm/stacktrace.h>
Ingo Molnar6e7c4022008-01-30 13:30:05 +010067#include <asm/io.h>
Andi Kleen29cbc782006-09-30 01:47:55 +020068#endif
Dave Youngc55b7c32010-03-10 15:24:08 -080069#ifdef CONFIG_BSD_PROCESS_ACCT
70#include <linux/acct.h>
71#endif
Dave Young4f0e0562010-03-10 15:24:09 -080072#ifdef CONFIG_RT_MUTEXES
73#include <linux/rtmutex.h>
74#endif
Dave Young2edf5e42010-03-10 15:24:10 -080075#if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
76#include <linux/lockdep.h>
77#endif
Dave Young15485a42010-03-10 15:24:07 -080078#ifdef CONFIG_CHR_DEV_SG
79#include <scsi/sg.h>
80#endif
Andi Kleen29cbc782006-09-30 01:47:55 +020081
Don Zickus58687ac2010-05-07 17:11:44 -040082#ifdef CONFIG_LOCKUP_DETECTOR
Don Zickus504d7cf2010-02-12 17:19:19 -050083#include <linux/nmi.h>
84#endif
85
Eric W. Biederman7058cb02007-10-18 03:05:58 -070086
Linus Torvalds1da177e2005-04-16 15:20:36 -070087#if defined(CONFIG_SYSCTL)
88
89/* External variables not in a header file. */
Linus Torvalds1da177e2005-04-16 15:20:36 -070090extern int sysctl_overcommit_memory;
91extern int sysctl_overcommit_ratio;
92extern int max_threads;
Linus Torvalds1da177e2005-04-16 15:20:36 -070093extern int core_uses_pid;
Alan Coxd6e71142005-06-23 00:09:43 -070094extern int suid_dumpable;
Linus Torvalds1da177e2005-04-16 15:20:36 -070095extern char core_pattern[];
Neil Hormana2939802009-09-23 15:56:56 -070096extern unsigned int core_pipe_limit;
Linus Torvalds1da177e2005-04-16 15:20:36 -070097extern int pid_max;
98extern int min_free_kbytes;
Linus Torvalds1da177e2005-04-16 15:20:36 -070099extern int pid_max_min, pid_max_max;
Andrew Morton9d0243b2006-01-08 01:00:39 -0800100extern int sysctl_drop_caches;
Rohit Seth8ad4b1f2006-01-08 01:00:40 -0800101extern int percpu_pagelist_fraction;
Andi Kleenbebfa102006-06-26 13:56:52 +0200102extern int compat_log;
Arjan van de Ven97455122008-01-25 21:08:34 +0100103extern int latencytop_enabled;
Al Viroeceea0b2008-05-10 10:08:32 -0400104extern int sysctl_nr_open_min, sysctl_nr_open_max;
Paul Mundtdd8632a2009-01-08 12:04:47 +0000105#ifndef CONFIG_MMU
106extern int sysctl_nr_trim_pages;
107#endif
Jens Axboecb684b52009-09-15 21:53:11 +0200108#ifdef CONFIG_BLOCK
Jens Axboe5e605b62009-08-05 09:07:21 +0200109extern int blk_iopoll_enabled;
Jens Axboecb684b52009-09-15 21:53:11 +0200110#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111
Ravikiran G Thirumalaic4f3b632007-10-16 23:26:09 -0700112/* Constants used for minimum and maximum */
Don Zickus2508ce12010-05-07 17:11:46 -0400113#ifdef CONFIG_LOCKUP_DETECTOR
Ravikiran G Thirumalaic4f3b632007-10-16 23:26:09 -0700114static int sixty = 60;
Dimitri Sivanich9383d962008-05-12 21:21:14 +0200115static int neg_one = -1;
Ravikiran G Thirumalaic4f3b632007-10-16 23:26:09 -0700116#endif
117
Ravikiran G Thirumalaic4f3b632007-10-16 23:26:09 -0700118static int zero;
Linus Torvaldscd5f9a42009-04-06 13:38:46 -0700119static int __maybe_unused one = 1;
120static int __maybe_unused two = 2;
Petr Holasekcb16e952011-03-23 16:43:09 -0700121static int __maybe_unused three = 3;
Sven Wegenerfc3501d2009-02-11 13:04:23 -0800122static unsigned long one_ul = 1;
Ravikiran G Thirumalaic4f3b632007-10-16 23:26:09 -0700123static int one_hundred = 100;
Dave Youngaf913222009-09-22 16:43:33 -0700124#ifdef CONFIG_PRINTK
125static int ten_thousand = 10000;
126#endif
Ravikiran G Thirumalaic4f3b632007-10-16 23:26:09 -0700127
Andrea Righi9e4a5bd2009-04-30 15:08:57 -0700128/* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
129static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
130
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131/* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
132static int maxolduid = 65535;
133static int minolduid;
Rohit Seth8ad4b1f2006-01-08 01:00:40 -0800134static int min_percpu_pagelist_fract = 8;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135
136static int ngroups_max = NGROUPS_MAX;
137
Dave Youngd14f1722010-02-25 20:28:57 -0500138#ifdef CONFIG_INOTIFY_USER
139#include <linux/inotify.h>
140#endif
David S. Miller72c57ed2008-09-11 23:29:54 -0700141#ifdef CONFIG_SPARC
David S. Miller17f04fb2008-09-11 23:33:53 -0700142#include <asm/system.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143#endif
144
David S. Miller08714202008-11-16 23:49:24 -0800145#ifdef CONFIG_SPARC64
146extern int sysctl_tsb_ratio;
147#endif
148
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149#ifdef __hppa__
150extern int pwrsw_enabled;
151extern int unaligned_enabled;
152#endif
153
Martin Schwidefsky347a8dc2006-01-06 00:19:28 -0800154#ifdef CONFIG_S390
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155#ifdef CONFIG_MATHEMU
156extern int sysctl_ieee_emulation_warnings;
157#endif
158extern int sysctl_userprocess_debug;
Martin Schwidefsky951f22d2005-07-27 11:44:57 -0700159extern int spin_retry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160#endif
161
Jes Sorensend2b176e2006-02-28 09:42:23 -0800162#ifdef CONFIG_IA64
163extern int no_unaligned_warning;
Doug Chapman88fc2412009-01-15 10:38:56 -0800164extern int unaligned_dump_stack;
Jes Sorensend2b176e2006-02-28 09:42:23 -0800165#endif
166
Randy Dunlapd6f8ff72006-10-19 23:28:34 -0700167#ifdef CONFIG_PROC_SYSCTL
Alexey Dobriyan8d65af72009-09-23 15:57:19 -0700168static int proc_do_cad_pid(struct ctl_table *table, int write,
Cedric Le Goater9ec52092006-10-02 02:19:00 -0700169 void __user *buffer, size_t *lenp, loff_t *ppos);
Alexey Dobriyan8d65af72009-09-23 15:57:19 -0700170static int proc_taint(struct ctl_table *table, int write,
Theodore Ts'o34f5a392007-02-10 01:45:24 -0800171 void __user *buffer, size_t *lenp, loff_t *ppos);
Randy Dunlapd6f8ff72006-10-19 23:28:34 -0700172#endif
Cedric Le Goater9ec52092006-10-02 02:19:00 -0700173
Richard Weinbergerbfdc0b42011-03-23 16:43:11 -0700174#ifdef CONFIG_PRINTK
175static int proc_dmesg_restrict(struct ctl_table *table, int write,
176 void __user *buffer, size_t *lenp, loff_t *ppos);
177#endif
178
Dmitry Torokhov97f5f0c2010-03-21 22:31:26 -0700179#ifdef CONFIG_MAGIC_SYSRQ
Andy Whitcroft8c6a98b2011-01-24 09:31:38 -0800180/* Note: sysrq code uses it's own private copy */
181static int __sysrq_enabled = SYSRQ_DEFAULT_ENABLE;
Dmitry Torokhov97f5f0c2010-03-21 22:31:26 -0700182
183static int sysrq_sysctl_handler(ctl_table *table, int write,
184 void __user *buffer, size_t *lenp,
185 loff_t *ppos)
186{
187 int error;
188
189 error = proc_dointvec(table, write, buffer, lenp, ppos);
190 if (error)
191 return error;
192
193 if (write)
194 sysrq_toggle_support(__sysrq_enabled);
195
196 return 0;
197}
198
199#endif
200
Eric W. Biedermand8217f02007-10-18 03:05:22 -0700201static struct ctl_table root_table[];
Eric W. Biedermane51b6ba2007-11-30 23:54:00 +1100202static struct ctl_table_root sysctl_table_root;
203static struct ctl_table_header root_table_header = {
Al Virodfef6dcd32011-03-08 01:25:28 -0500204 {{.count = 1,
Eric W. Biedermane51b6ba2007-11-30 23:54:00 +1100205 .ctl_table = root_table,
Al Virodfef6dcd32011-03-08 01:25:28 -0500206 .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.default_set.list),}},
Eric W. Biedermane51b6ba2007-11-30 23:54:00 +1100207 .root = &sysctl_table_root,
Al Viro73455092008-07-14 21:22:20 -0400208 .set = &sysctl_table_root.default_set,
Eric W. Biedermane51b6ba2007-11-30 23:54:00 +1100209};
210static struct ctl_table_root sysctl_table_root = {
211 .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list),
Al Viro73455092008-07-14 21:22:20 -0400212 .default_set.list = LIST_HEAD_INIT(root_table_header.ctl_entry),
Eric W. Biedermane51b6ba2007-11-30 23:54:00 +1100213};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214
Eric W. Biedermand8217f02007-10-18 03:05:22 -0700215static struct ctl_table kern_table[];
216static struct ctl_table vm_table[];
217static struct ctl_table fs_table[];
218static struct ctl_table debug_table[];
219static struct ctl_table dev_table[];
220extern struct ctl_table random_table[];
Davide Libenzi7ef99642008-12-01 13:13:55 -0800221#ifdef CONFIG_EPOLL
222extern struct ctl_table epoll_table[];
223#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224
225#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
226int sysctl_legacy_va_layout;
227#endif
228
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229/* The default sysctl tables: */
230
Eric W. Biedermand8217f02007-10-18 03:05:22 -0700231static struct ctl_table root_table[] = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233 .procname = "kernel",
234 .mode = 0555,
235 .child = kern_table,
236 },
237 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238 .procname = "vm",
239 .mode = 0555,
240 .child = vm_table,
241 },
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243 .procname = "fs",
244 .mode = 0555,
245 .child = fs_table,
246 },
247 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248 .procname = "debug",
249 .mode = 0555,
250 .child = debug_table,
251 },
252 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253 .procname = "dev",
254 .mode = 0555,
255 .child = dev_table,
256 },
Eric W. Biederman6fce56e2009-04-03 02:30:53 -0700257 { }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258};
259
Ingo Molnar77e54a12007-07-09 18:52:00 +0200260#ifdef CONFIG_SCHED_DEBUG
Eric Dumazet73c4efd2007-12-18 15:21:13 +0100261static int min_sched_granularity_ns = 100000; /* 100 usecs */
262static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
263static int min_wakeup_granularity_ns; /* 0 usecs */
264static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
Christian Ehrhardt1983a922009-11-30 12:16:47 +0100265static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
266static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
Ingo Molnar77e54a12007-07-09 18:52:00 +0200267#endif
268
Mel Gorman5e771902010-05-24 14:32:31 -0700269#ifdef CONFIG_COMPACTION
270static int min_extfrag_threshold;
271static int max_extfrag_threshold = 1000;
272#endif
273
Eric W. Biedermand8217f02007-10-18 03:05:22 -0700274static struct ctl_table kern_table[] = {
Mike Galbraith2bba22c2009-09-09 15:41:37 +0200275 {
Mike Galbraith2bba22c2009-09-09 15:41:37 +0200276 .procname = "sched_child_runs_first",
277 .data = &sysctl_sched_child_runs_first,
278 .maxlen = sizeof(unsigned int),
279 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800280 .proc_handler = proc_dointvec,
Mike Galbraith2bba22c2009-09-09 15:41:37 +0200281 },
Ingo Molnar77e54a12007-07-09 18:52:00 +0200282#ifdef CONFIG_SCHED_DEBUG
283 {
Peter Zijlstrab2be5e92007-11-09 22:39:37 +0100284 .procname = "sched_min_granularity_ns",
285 .data = &sysctl_sched_min_granularity,
Ingo Molnar77e54a12007-07-09 18:52:00 +0200286 .maxlen = sizeof(unsigned int),
287 .mode = 0644,
Linus Torvalds702a7c72009-12-12 11:34:10 -0800288 .proc_handler = sched_proc_update_handler,
Peter Zijlstrab2be5e92007-11-09 22:39:37 +0100289 .extra1 = &min_sched_granularity_ns,
290 .extra2 = &max_sched_granularity_ns,
Ingo Molnar77e54a12007-07-09 18:52:00 +0200291 },
292 {
Peter Zijlstra21805082007-08-25 18:41:53 +0200293 .procname = "sched_latency_ns",
294 .data = &sysctl_sched_latency,
295 .maxlen = sizeof(unsigned int),
296 .mode = 0644,
Linus Torvalds702a7c72009-12-12 11:34:10 -0800297 .proc_handler = sched_proc_update_handler,
Peter Zijlstra21805082007-08-25 18:41:53 +0200298 .extra1 = &min_sched_granularity_ns,
299 .extra2 = &max_sched_granularity_ns,
300 },
301 {
Ingo Molnar77e54a12007-07-09 18:52:00 +0200302 .procname = "sched_wakeup_granularity_ns",
303 .data = &sysctl_sched_wakeup_granularity,
304 .maxlen = sizeof(unsigned int),
305 .mode = 0644,
Linus Torvalds702a7c72009-12-12 11:34:10 -0800306 .proc_handler = sched_proc_update_handler,
Ingo Molnar77e54a12007-07-09 18:52:00 +0200307 .extra1 = &min_wakeup_granularity_ns,
308 .extra2 = &max_wakeup_granularity_ns,
309 },
310 {
Christian Ehrhardt1983a922009-11-30 12:16:47 +0100311 .procname = "sched_tunable_scaling",
312 .data = &sysctl_sched_tunable_scaling,
313 .maxlen = sizeof(enum sched_tunable_scaling),
314 .mode = 0644,
Linus Torvalds702a7c72009-12-12 11:34:10 -0800315 .proc_handler = sched_proc_update_handler,
Christian Ehrhardt1983a922009-11-30 12:16:47 +0100316 .extra1 = &min_sched_tunable_scaling,
317 .extra2 = &max_sched_tunable_scaling,
Peter Zijlstra2398f2c2008-06-27 13:41:35 +0200318 },
319 {
Ingo Molnarda84d962007-10-15 17:00:18 +0200320 .procname = "sched_migration_cost",
321 .data = &sysctl_sched_migration_cost,
322 .maxlen = sizeof(unsigned int),
323 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800324 .proc_handler = proc_dointvec,
Ingo Molnarda84d962007-10-15 17:00:18 +0200325 },
Peter Zijlstrab82d9fd2007-11-09 22:39:39 +0100326 {
Peter Zijlstrab82d9fd2007-11-09 22:39:39 +0100327 .procname = "sched_nr_migrate",
328 .data = &sysctl_sched_nr_migrate,
329 .maxlen = sizeof(unsigned int),
Peter Zijlstrafa85ae22008-01-25 21:08:29 +0100330 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800331 .proc_handler = proc_dointvec,
Peter Zijlstrafa85ae22008-01-25 21:08:29 +0100332 },
Arun R Bharadwajcd1bb942009-04-16 12:15:34 +0530333 {
Peter Zijlstrae9e92502009-09-01 10:34:37 +0200334 .procname = "sched_time_avg",
335 .data = &sysctl_sched_time_avg,
336 .maxlen = sizeof(unsigned int),
337 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800338 .proc_handler = proc_dointvec,
Peter Zijlstrae9e92502009-09-01 10:34:37 +0200339 },
340 {
Paul Turnera7a4f8a2010-11-15 15:47:06 -0800341 .procname = "sched_shares_window",
342 .data = &sysctl_sched_shares_window,
343 .maxlen = sizeof(unsigned int),
344 .mode = 0644,
345 .proc_handler = proc_dointvec,
346 },
347 {
Arun R Bharadwajcd1bb942009-04-16 12:15:34 +0530348 .procname = "timer_migration",
349 .data = &sysctl_timer_migration,
350 .maxlen = sizeof(unsigned int),
351 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800352 .proc_handler = proc_dointvec_minmax,
Arun R Bharadwajbfdb4d92009-06-23 10:00:58 +0530353 .extra1 = &zero,
354 .extra2 = &one,
Arun R Bharadwajcd1bb942009-04-16 12:15:34 +0530355 },
Peter Zijlstra1fc84aa2007-08-25 18:41:52 +0200356#endif
Ingo Molnar1799e352007-09-19 23:34:46 +0200357 {
Peter Zijlstra9f0c1e52008-02-13 15:45:39 +0100358 .procname = "sched_rt_period_us",
359 .data = &sysctl_sched_rt_period,
360 .maxlen = sizeof(unsigned int),
361 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800362 .proc_handler = sched_rt_handler,
Peter Zijlstra9f0c1e52008-02-13 15:45:39 +0100363 },
364 {
Peter Zijlstra9f0c1e52008-02-13 15:45:39 +0100365 .procname = "sched_rt_runtime_us",
366 .data = &sysctl_sched_rt_runtime,
367 .maxlen = sizeof(int),
368 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800369 .proc_handler = sched_rt_handler,
Peter Zijlstra9f0c1e52008-02-13 15:45:39 +0100370 },
Mike Galbraith5091faa2010-11-30 14:18:03 +0100371#ifdef CONFIG_SCHED_AUTOGROUP
372 {
373 .procname = "sched_autogroup_enabled",
374 .data = &sysctl_sched_autogroup_enabled,
375 .maxlen = sizeof(unsigned int),
376 .mode = 0644,
Yong Zhang1747b212011-02-20 15:08:12 +0800377 .proc_handler = proc_dointvec_minmax,
Mike Galbraith5091faa2010-11-30 14:18:03 +0100378 .extra1 = &zero,
379 .extra2 = &one,
380 },
381#endif
Peter Zijlstraf20786f2007-07-19 01:48:56 -0700382#ifdef CONFIG_PROVE_LOCKING
383 {
Peter Zijlstraf20786f2007-07-19 01:48:56 -0700384 .procname = "prove_locking",
385 .data = &prove_locking,
386 .maxlen = sizeof(int),
387 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800388 .proc_handler = proc_dointvec,
Peter Zijlstraf20786f2007-07-19 01:48:56 -0700389 },
390#endif
391#ifdef CONFIG_LOCK_STAT
392 {
Peter Zijlstraf20786f2007-07-19 01:48:56 -0700393 .procname = "lock_stat",
394 .data = &lock_stat,
395 .maxlen = sizeof(int),
396 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800397 .proc_handler = proc_dointvec,
Peter Zijlstraf20786f2007-07-19 01:48:56 -0700398 },
399#endif
Ingo Molnar77e54a12007-07-09 18:52:00 +0200400 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401 .procname = "panic",
402 .data = &panic_timeout,
403 .maxlen = sizeof(int),
404 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800405 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406 },
407 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408 .procname = "core_uses_pid",
409 .data = &core_uses_pid,
410 .maxlen = sizeof(int),
411 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800412 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413 },
414 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415 .procname = "core_pattern",
416 .data = core_pattern,
Dan Aloni71ce92f2007-05-16 22:11:16 -0700417 .maxlen = CORENAME_MAX_SIZE,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800419 .proc_handler = proc_dostring,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420 },
Neil Hormana2939802009-09-23 15:56:56 -0700421 {
Neil Hormana2939802009-09-23 15:56:56 -0700422 .procname = "core_pipe_limit",
423 .data = &core_pipe_limit,
424 .maxlen = sizeof(unsigned int),
425 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800426 .proc_handler = proc_dointvec,
Neil Hormana2939802009-09-23 15:56:56 -0700427 },
Theodore Ts'o34f5a392007-02-10 01:45:24 -0800428#ifdef CONFIG_PROC_SYSCTL
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430 .procname = "tainted",
Andi Kleen25ddbb12008-10-15 22:01:41 -0700431 .maxlen = sizeof(long),
Theodore Ts'o34f5a392007-02-10 01:45:24 -0800432 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800433 .proc_handler = proc_taint,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700434 },
Theodore Ts'o34f5a392007-02-10 01:45:24 -0800435#endif
Arjan van de Ven97455122008-01-25 21:08:34 +0100436#ifdef CONFIG_LATENCYTOP
437 {
438 .procname = "latencytop",
439 .data = &latencytop_enabled,
440 .maxlen = sizeof(int),
441 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800442 .proc_handler = proc_dointvec,
Arjan van de Ven97455122008-01-25 21:08:34 +0100443 },
444#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445#ifdef CONFIG_BLK_DEV_INITRD
446 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447 .procname = "real-root-dev",
448 .data = &real_root_dev,
449 .maxlen = sizeof(int),
450 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800451 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452 },
453#endif
Ingo Molnar45807a12007-07-15 23:40:10 -0700454 {
Ingo Molnar45807a12007-07-15 23:40:10 -0700455 .procname = "print-fatal-signals",
456 .data = &print_fatal_signals,
457 .maxlen = sizeof(int),
458 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800459 .proc_handler = proc_dointvec,
Ingo Molnar45807a12007-07-15 23:40:10 -0700460 },
David S. Miller72c57ed2008-09-11 23:29:54 -0700461#ifdef CONFIG_SPARC
Linus Torvalds1da177e2005-04-16 15:20:36 -0700462 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463 .procname = "reboot-cmd",
464 .data = reboot_command,
465 .maxlen = 256,
466 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800467 .proc_handler = proc_dostring,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468 },
469 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700470 .procname = "stop-a",
471 .data = &stop_a_enabled,
472 .maxlen = sizeof (int),
473 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800474 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700475 },
476 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477 .procname = "scons-poweroff",
478 .data = &scons_pwroff,
479 .maxlen = sizeof (int),
480 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800481 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482 },
483#endif
David S. Miller08714202008-11-16 23:49:24 -0800484#ifdef CONFIG_SPARC64
485 {
David S. Miller08714202008-11-16 23:49:24 -0800486 .procname = "tsb-ratio",
487 .data = &sysctl_tsb_ratio,
488 .maxlen = sizeof (int),
489 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800490 .proc_handler = proc_dointvec,
David S. Miller08714202008-11-16 23:49:24 -0800491 },
492#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700493#ifdef __hppa__
494 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495 .procname = "soft-power",
496 .data = &pwrsw_enabled,
497 .maxlen = sizeof (int),
498 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800499 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700500 },
501 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700502 .procname = "unaligned-trap",
503 .data = &unaligned_enabled,
504 .maxlen = sizeof (int),
505 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800506 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700507 },
508#endif
509 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700510 .procname = "ctrl-alt-del",
511 .data = &C_A_D,
512 .maxlen = sizeof(int),
513 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800514 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700515 },
Steven Rostedt606576c2008-10-06 19:06:12 -0400516#ifdef CONFIG_FUNCTION_TRACER
Steven Rostedtb0fc4942008-05-12 21:20:43 +0200517 {
Steven Rostedtb0fc4942008-05-12 21:20:43 +0200518 .procname = "ftrace_enabled",
519 .data = &ftrace_enabled,
520 .maxlen = sizeof(int),
521 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800522 .proc_handler = ftrace_enable_sysctl,
Steven Rostedtb0fc4942008-05-12 21:20:43 +0200523 },
524#endif
Steven Rostedtf38f1d22008-12-16 23:06:40 -0500525#ifdef CONFIG_STACK_TRACER
526 {
Steven Rostedtf38f1d22008-12-16 23:06:40 -0500527 .procname = "stack_tracer_enabled",
528 .data = &stack_tracer_enabled,
529 .maxlen = sizeof(int),
530 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800531 .proc_handler = stack_trace_sysctl,
Steven Rostedtf38f1d22008-12-16 23:06:40 -0500532 },
533#endif
Steven Rostedt944ac422008-10-23 19:26:08 -0400534#ifdef CONFIG_TRACING
535 {
Peter Zijlstra3299b4dd2008-11-04 11:58:21 +0100536 .procname = "ftrace_dump_on_oops",
Steven Rostedt944ac422008-10-23 19:26:08 -0400537 .data = &ftrace_dump_on_oops,
538 .maxlen = sizeof(int),
539 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800540 .proc_handler = proc_dointvec,
Steven Rostedt944ac422008-10-23 19:26:08 -0400541 },
542#endif
Johannes Berga1ef5ad2008-07-08 19:00:17 +0200543#ifdef CONFIG_MODULES
Linus Torvalds1da177e2005-04-16 15:20:36 -0700544 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700545 .procname = "modprobe",
546 .data = &modprobe_path,
547 .maxlen = KMOD_PATH_LEN,
548 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800549 .proc_handler = proc_dostring,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550 },
Kees Cook3d433212009-04-02 15:49:29 -0700551 {
Kees Cook3d433212009-04-02 15:49:29 -0700552 .procname = "modules_disabled",
553 .data = &modules_disabled,
554 .maxlen = sizeof(int),
555 .mode = 0644,
556 /* only handle a transition from default "0" to "1" */
Eric W. Biederman6d456112009-11-16 03:11:48 -0800557 .proc_handler = proc_dointvec_minmax,
Kees Cook3d433212009-04-02 15:49:29 -0700558 .extra1 = &one,
559 .extra2 = &one,
560 },
Linus Torvalds1da177e2005-04-16 15:20:36 -0700561#endif
Ian Abbott94f17cd2010-06-07 12:57:12 +0100562#ifdef CONFIG_HOTPLUG
Linus Torvalds1da177e2005-04-16 15:20:36 -0700563 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700564 .procname = "hotplug",
Kay Sievers312c004d2005-11-16 09:00:00 +0100565 .data = &uevent_helper,
566 .maxlen = UEVENT_HELPER_PATH_LEN,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700567 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800568 .proc_handler = proc_dostring,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700569 },
570#endif
571#ifdef CONFIG_CHR_DEV_SG
572 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573 .procname = "sg-big-buff",
574 .data = &sg_big_buff,
575 .maxlen = sizeof (int),
576 .mode = 0444,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800577 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700578 },
579#endif
580#ifdef CONFIG_BSD_PROCESS_ACCT
581 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700582 .procname = "acct",
583 .data = &acct_parm,
584 .maxlen = 3*sizeof(int),
585 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800586 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700587 },
588#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700589#ifdef CONFIG_MAGIC_SYSRQ
590 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700591 .procname = "sysrq",
Ingo Molnar5d6f6472006-12-13 00:34:36 -0800592 .data = &__sysrq_enabled,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700593 .maxlen = sizeof (int),
594 .mode = 0644,
Dmitry Torokhov97f5f0c2010-03-21 22:31:26 -0700595 .proc_handler = sysrq_sysctl_handler,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700596 },
597#endif
Randy Dunlapd6f8ff72006-10-19 23:28:34 -0700598#ifdef CONFIG_PROC_SYSCTL
Linus Torvalds1da177e2005-04-16 15:20:36 -0700599 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700600 .procname = "cad_pid",
Cedric Le Goater9ec52092006-10-02 02:19:00 -0700601 .data = NULL,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700602 .maxlen = sizeof (int),
603 .mode = 0600,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800604 .proc_handler = proc_do_cad_pid,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700605 },
Randy Dunlapd6f8ff72006-10-19 23:28:34 -0700606#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700607 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700608 .procname = "threads-max",
609 .data = &max_threads,
610 .maxlen = sizeof(int),
611 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800612 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700613 },
614 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700615 .procname = "random",
616 .mode = 0555,
617 .child = random_table,
618 },
Linus Torvalds1da177e2005-04-16 15:20:36 -0700619 {
Eric Paris17f60a72011-04-01 17:07:50 -0400620 .procname = "usermodehelper",
621 .mode = 0555,
622 .child = usermodehelper_table,
623 },
624 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700625 .procname = "overflowuid",
626 .data = &overflowuid,
627 .maxlen = sizeof(int),
628 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800629 .proc_handler = proc_dointvec_minmax,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700630 .extra1 = &minolduid,
631 .extra2 = &maxolduid,
632 },
633 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700634 .procname = "overflowgid",
635 .data = &overflowgid,
636 .maxlen = sizeof(int),
637 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800638 .proc_handler = proc_dointvec_minmax,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700639 .extra1 = &minolduid,
640 .extra2 = &maxolduid,
641 },
Martin Schwidefsky347a8dc2006-01-06 00:19:28 -0800642#ifdef CONFIG_S390
Linus Torvalds1da177e2005-04-16 15:20:36 -0700643#ifdef CONFIG_MATHEMU
644 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700645 .procname = "ieee_emulation_warnings",
646 .data = &sysctl_ieee_emulation_warnings,
647 .maxlen = sizeof(int),
648 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800649 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700650 },
651#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700652 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700653 .procname = "userprocess_debug",
Heiko Carstensab3c68e2010-05-17 10:00:21 +0200654 .data = &show_unhandled_signals,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700655 .maxlen = sizeof(int),
656 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800657 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700658 },
659#endif
660 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700661 .procname = "pid_max",
662 .data = &pid_max,
663 .maxlen = sizeof (int),
664 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800665 .proc_handler = proc_dointvec_minmax,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700666 .extra1 = &pid_max_min,
667 .extra2 = &pid_max_max,
668 },
669 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700670 .procname = "panic_on_oops",
671 .data = &panic_on_oops,
672 .maxlen = sizeof(int),
673 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800674 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700675 },
Joe Perches7ef3d2f2008-02-08 04:21:25 -0800676#if defined CONFIG_PRINTK
677 {
Joe Perches7ef3d2f2008-02-08 04:21:25 -0800678 .procname = "printk",
679 .data = &console_loglevel,
680 .maxlen = 4*sizeof(int),
681 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800682 .proc_handler = proc_dointvec,
Joe Perches7ef3d2f2008-02-08 04:21:25 -0800683 },
Linus Torvalds1da177e2005-04-16 15:20:36 -0700684 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700685 .procname = "printk_ratelimit",
Dave Young717115e2008-07-25 01:45:58 -0700686 .data = &printk_ratelimit_state.interval,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700687 .maxlen = sizeof(int),
688 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800689 .proc_handler = proc_dointvec_jiffies,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700690 },
691 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700692 .procname = "printk_ratelimit_burst",
Dave Young717115e2008-07-25 01:45:58 -0700693 .data = &printk_ratelimit_state.burst,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700694 .maxlen = sizeof(int),
695 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800696 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700697 },
Dave Youngaf913222009-09-22 16:43:33 -0700698 {
Dave Youngaf913222009-09-22 16:43:33 -0700699 .procname = "printk_delay",
700 .data = &printk_delay_msec,
701 .maxlen = sizeof(int),
702 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800703 .proc_handler = proc_dointvec_minmax,
Dave Youngaf913222009-09-22 16:43:33 -0700704 .extra1 = &zero,
705 .extra2 = &ten_thousand,
706 },
Linus Torvalds1da177e2005-04-16 15:20:36 -0700707 {
Dan Rosenbergeaf06b22010-11-11 14:05:18 -0800708 .procname = "dmesg_restrict",
709 .data = &dmesg_restrict,
710 .maxlen = sizeof(int),
711 .mode = 0644,
712 .proc_handler = proc_dointvec_minmax,
713 .extra1 = &zero,
714 .extra2 = &one,
715 },
Dan Rosenberg455cd5a2011-01-12 16:59:41 -0800716 {
717 .procname = "kptr_restrict",
718 .data = &kptr_restrict,
719 .maxlen = sizeof(int),
720 .mode = 0644,
Richard Weinbergerbfdc0b42011-03-23 16:43:11 -0700721 .proc_handler = proc_dmesg_restrict,
Dan Rosenberg455cd5a2011-01-12 16:59:41 -0800722 .extra1 = &zero,
723 .extra2 = &two,
724 },
Joe Perchesdf6e61d2010-11-15 21:17:27 -0800725#endif
Dan Rosenbergeaf06b22010-11-11 14:05:18 -0800726 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700727 .procname = "ngroups_max",
728 .data = &ngroups_max,
729 .maxlen = sizeof (int),
730 .mode = 0444,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800731 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700732 },
Don Zickus58687ac2010-05-07 17:11:44 -0400733#if defined(CONFIG_LOCKUP_DETECTOR)
Don Zickus504d7cf2010-02-12 17:19:19 -0500734 {
Don Zickus58687ac2010-05-07 17:11:44 -0400735 .procname = "watchdog",
736 .data = &watchdog_enabled,
Don Zickus504d7cf2010-02-12 17:19:19 -0500737 .maxlen = sizeof (int),
738 .mode = 0644,
Don Zickus58687ac2010-05-07 17:11:44 -0400739 .proc_handler = proc_dowatchdog_enabled,
740 },
741 {
742 .procname = "watchdog_thresh",
743 .data = &softlockup_thresh,
744 .maxlen = sizeof(int),
745 .mode = 0644,
746 .proc_handler = proc_dowatchdog_thresh,
747 .extra1 = &neg_one,
748 .extra2 = &sixty,
Don Zickus504d7cf2010-02-12 17:19:19 -0500749 },
Don Zickus2508ce12010-05-07 17:11:46 -0400750 {
751 .procname = "softlockup_panic",
752 .data = &softlockup_panic,
753 .maxlen = sizeof(int),
754 .mode = 0644,
755 .proc_handler = proc_dointvec_minmax,
756 .extra1 = &zero,
757 .extra2 = &one,
758 },
Don Zickus5dc30552010-11-29 17:07:17 -0500759 {
760 .procname = "nmi_watchdog",
761 .data = &watchdog_enabled,
762 .maxlen = sizeof (int),
763 .mode = 0644,
764 .proc_handler = proc_dowatchdog_enabled,
765 },
766#endif
767#if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
768 {
769 .procname = "unknown_nmi_panic",
770 .data = &unknown_nmi_panic,
771 .maxlen = sizeof (int),
772 .mode = 0644,
773 .proc_handler = proc_dointvec,
774 },
Don Zickus504d7cf2010-02-12 17:19:19 -0500775#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700776#if defined(CONFIG_X86)
777 {
Don Zickus8da5add2006-09-26 10:52:27 +0200778 .procname = "panic_on_unrecovered_nmi",
779 .data = &panic_on_unrecovered_nmi,
780 .maxlen = sizeof(int),
781 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800782 .proc_handler = proc_dointvec,
Don Zickus8da5add2006-09-26 10:52:27 +0200783 },
784 {
Kurt Garloff5211a242009-06-24 14:32:11 -0700785 .procname = "panic_on_io_nmi",
786 .data = &panic_on_io_nmi,
787 .maxlen = sizeof(int),
788 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800789 .proc_handler = proc_dointvec,
Kurt Garloff5211a242009-06-24 14:32:11 -0700790 },
791 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700792 .procname = "bootloader_type",
793 .data = &bootloader_type,
794 .maxlen = sizeof (int),
795 .mode = 0444,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800796 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700797 },
Chuck Ebbert0741f4d2006-12-07 02:14:11 +0100798 {
H. Peter Anvin50312962009-05-07 16:54:11 -0700799 .procname = "bootloader_version",
800 .data = &bootloader_version,
801 .maxlen = sizeof (int),
802 .mode = 0444,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800803 .proc_handler = proc_dointvec,
H. Peter Anvin50312962009-05-07 16:54:11 -0700804 },
805 {
Chuck Ebbert0741f4d2006-12-07 02:14:11 +0100806 .procname = "kstack_depth_to_print",
807 .data = &kstack_depth_to_print,
808 .maxlen = sizeof(int),
809 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800810 .proc_handler = proc_dointvec,
Chuck Ebbert0741f4d2006-12-07 02:14:11 +0100811 },
Ingo Molnar6e7c4022008-01-30 13:30:05 +0100812 {
Ingo Molnar6e7c4022008-01-30 13:30:05 +0100813 .procname = "io_delay_type",
814 .data = &io_delay_type,
815 .maxlen = sizeof(int),
816 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800817 .proc_handler = proc_dointvec,
Ingo Molnar6e7c4022008-01-30 13:30:05 +0100818 },
Linus Torvalds1da177e2005-04-16 15:20:36 -0700819#endif
Luke Yang7a9166e2006-02-20 18:28:07 -0800820#if defined(CONFIG_MMU)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700821 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700822 .procname = "randomize_va_space",
823 .data = &randomize_va_space,
824 .maxlen = sizeof(int),
825 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800826 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700827 },
Luke Yang7a9166e2006-02-20 18:28:07 -0800828#endif
Martin Schwidefsky0152fb32006-01-14 13:21:00 -0800829#if defined(CONFIG_S390) && defined(CONFIG_SMP)
Martin Schwidefsky951f22d2005-07-27 11:44:57 -0700830 {
Martin Schwidefsky951f22d2005-07-27 11:44:57 -0700831 .procname = "spin_retry",
832 .data = &spin_retry,
833 .maxlen = sizeof (int),
834 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800835 .proc_handler = proc_dointvec,
Martin Schwidefsky951f22d2005-07-27 11:44:57 -0700836 },
837#endif
Len Brown673d5b42007-07-28 03:33:16 -0400838#if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
Pavel Machekc255d842006-02-20 18:27:58 -0800839 {
Pavel Machekc255d842006-02-20 18:27:58 -0800840 .procname = "acpi_video_flags",
Pavel Machek77afcf72007-07-19 01:47:41 -0700841 .data = &acpi_realmode_flags,
Pavel Machekc255d842006-02-20 18:27:58 -0800842 .maxlen = sizeof (unsigned long),
843 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800844 .proc_handler = proc_doulongvec_minmax,
Pavel Machekc255d842006-02-20 18:27:58 -0800845 },
846#endif
Jes Sorensend2b176e2006-02-28 09:42:23 -0800847#ifdef CONFIG_IA64
848 {
Jes Sorensend2b176e2006-02-28 09:42:23 -0800849 .procname = "ignore-unaligned-usertrap",
850 .data = &no_unaligned_warning,
851 .maxlen = sizeof (int),
852 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800853 .proc_handler = proc_dointvec,
Jes Sorensend2b176e2006-02-28 09:42:23 -0800854 },
Doug Chapman88fc2412009-01-15 10:38:56 -0800855 {
Doug Chapman88fc2412009-01-15 10:38:56 -0800856 .procname = "unaligned-dump-stack",
857 .data = &unaligned_dump_stack,
858 .maxlen = sizeof (int),
859 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800860 .proc_handler = proc_dointvec,
Doug Chapman88fc2412009-01-15 10:38:56 -0800861 },
Jes Sorensend2b176e2006-02-28 09:42:23 -0800862#endif
Mandeep Singh Bainese162b392009-01-15 11:08:40 -0800863#ifdef CONFIG_DETECT_HUNG_TASK
864 {
Mandeep Singh Bainese162b392009-01-15 11:08:40 -0800865 .procname = "hung_task_panic",
866 .data = &sysctl_hung_task_panic,
867 .maxlen = sizeof(int),
868 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800869 .proc_handler = proc_dointvec_minmax,
Mandeep Singh Bainese162b392009-01-15 11:08:40 -0800870 .extra1 = &zero,
871 .extra2 = &one,
872 },
Ingo Molnar82a1fcb2008-01-25 21:08:02 +0100873 {
Ingo Molnar82a1fcb2008-01-25 21:08:02 +0100874 .procname = "hung_task_check_count",
875 .data = &sysctl_hung_task_check_count,
Ingo Molnar90739082008-01-25 21:08:34 +0100876 .maxlen = sizeof(unsigned long),
Ingo Molnar82a1fcb2008-01-25 21:08:02 +0100877 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800878 .proc_handler = proc_doulongvec_minmax,
Ingo Molnar82a1fcb2008-01-25 21:08:02 +0100879 },
880 {
Ingo Molnar82a1fcb2008-01-25 21:08:02 +0100881 .procname = "hung_task_timeout_secs",
882 .data = &sysctl_hung_task_timeout_secs,
Ingo Molnar90739082008-01-25 21:08:34 +0100883 .maxlen = sizeof(unsigned long),
Ingo Molnar82a1fcb2008-01-25 21:08:02 +0100884 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800885 .proc_handler = proc_dohung_task_timeout_secs,
Ingo Molnar82a1fcb2008-01-25 21:08:02 +0100886 },
887 {
Ingo Molnar82a1fcb2008-01-25 21:08:02 +0100888 .procname = "hung_task_warnings",
889 .data = &sysctl_hung_task_warnings,
Ingo Molnar90739082008-01-25 21:08:34 +0100890 .maxlen = sizeof(unsigned long),
Ingo Molnar82a1fcb2008-01-25 21:08:02 +0100891 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800892 .proc_handler = proc_doulongvec_minmax,
Ingo Molnar82a1fcb2008-01-25 21:08:02 +0100893 },
Ravikiran G Thirumalaic4f3b632007-10-16 23:26:09 -0700894#endif
Andi Kleenbebfa102006-06-26 13:56:52 +0200895#ifdef CONFIG_COMPAT
896 {
Andi Kleenbebfa102006-06-26 13:56:52 +0200897 .procname = "compat-log",
898 .data = &compat_log,
899 .maxlen = sizeof (int),
900 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800901 .proc_handler = proc_dointvec,
Andi Kleenbebfa102006-06-26 13:56:52 +0200902 },
903#endif
Ingo Molnar23f78d4a2006-06-27 02:54:53 -0700904#ifdef CONFIG_RT_MUTEXES
905 {
Ingo Molnar23f78d4a2006-06-27 02:54:53 -0700906 .procname = "max_lock_depth",
907 .data = &max_lock_depth,
908 .maxlen = sizeof(int),
909 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800910 .proc_handler = proc_dointvec,
Ingo Molnar23f78d4a2006-06-27 02:54:53 -0700911 },
912#endif
Jeremy Fitzhardinge10a0a8d2007-07-17 18:37:02 -0700913 {
Jeremy Fitzhardinge10a0a8d2007-07-17 18:37:02 -0700914 .procname = "poweroff_cmd",
915 .data = &poweroff_cmd,
916 .maxlen = POWEROFF_CMD_PATH_LEN,
917 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800918 .proc_handler = proc_dostring,
Jeremy Fitzhardinge10a0a8d2007-07-17 18:37:02 -0700919 },
David Howells0b77f5b2008-04-29 01:01:32 -0700920#ifdef CONFIG_KEYS
921 {
David Howells0b77f5b2008-04-29 01:01:32 -0700922 .procname = "keys",
923 .mode = 0555,
924 .child = key_sysctls,
925 },
926#endif
Paul E. McKenney31a72bc2008-06-18 09:26:49 -0700927#ifdef CONFIG_RCU_TORTURE_TEST
928 {
Paul E. McKenney31a72bc2008-06-18 09:26:49 -0700929 .procname = "rcutorture_runnable",
930 .data = &rcutorture_runnable,
931 .maxlen = sizeof(int),
932 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800933 .proc_handler = proc_dointvec,
Paul E. McKenney31a72bc2008-06-18 09:26:49 -0700934 },
935#endif
Ingo Molnarcdd6c482009-09-21 12:02:48 +0200936#ifdef CONFIG_PERF_EVENTS
Peter Zijlstra1ccd1542009-04-09 10:53:45 +0200937 {
Ingo Molnarcdd6c482009-09-21 12:02:48 +0200938 .procname = "perf_event_paranoid",
939 .data = &sysctl_perf_event_paranoid,
940 .maxlen = sizeof(sysctl_perf_event_paranoid),
Peter Zijlstra1ccd1542009-04-09 10:53:45 +0200941 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800942 .proc_handler = proc_dointvec,
Peter Zijlstra1ccd1542009-04-09 10:53:45 +0200943 },
Peter Zijlstrac5078f72009-05-05 17:50:24 +0200944 {
Ingo Molnarcdd6c482009-09-21 12:02:48 +0200945 .procname = "perf_event_mlock_kb",
946 .data = &sysctl_perf_event_mlock,
947 .maxlen = sizeof(sysctl_perf_event_mlock),
Peter Zijlstrac5078f72009-05-05 17:50:24 +0200948 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800949 .proc_handler = proc_dointvec,
Peter Zijlstrac5078f72009-05-05 17:50:24 +0200950 },
Peter Zijlstraa78ac322009-05-25 17:39:05 +0200951 {
Ingo Molnarcdd6c482009-09-21 12:02:48 +0200952 .procname = "perf_event_max_sample_rate",
953 .data = &sysctl_perf_event_sample_rate,
954 .maxlen = sizeof(sysctl_perf_event_sample_rate),
Peter Zijlstraa78ac322009-05-25 17:39:05 +0200955 .mode = 0644,
Peter Zijlstra163ec432011-02-16 11:22:34 +0100956 .proc_handler = perf_proc_update_handler,
Peter Zijlstraa78ac322009-05-25 17:39:05 +0200957 },
Peter Zijlstra1ccd1542009-04-09 10:53:45 +0200958#endif
Vegard Nossumdfec0722008-04-04 00:51:41 +0200959#ifdef CONFIG_KMEMCHECK
960 {
Vegard Nossumdfec0722008-04-04 00:51:41 +0200961 .procname = "kmemcheck",
962 .data = &kmemcheck_enabled,
963 .maxlen = sizeof(int),
964 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800965 .proc_handler = proc_dointvec,
Vegard Nossumdfec0722008-04-04 00:51:41 +0200966 },
967#endif
Jens Axboecb684b52009-09-15 21:53:11 +0200968#ifdef CONFIG_BLOCK
Jens Axboe5e605b62009-08-05 09:07:21 +0200969 {
Jens Axboe5e605b62009-08-05 09:07:21 +0200970 .procname = "blk_iopoll",
971 .data = &blk_iopoll_enabled,
972 .maxlen = sizeof(int),
973 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800974 .proc_handler = proc_dointvec,
Jens Axboe5e605b62009-08-05 09:07:21 +0200975 },
Jens Axboecb684b52009-09-15 21:53:11 +0200976#endif
Eric W. Biederman6fce56e2009-04-03 02:30:53 -0700977 { }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700978};
979
Eric W. Biedermand8217f02007-10-18 03:05:22 -0700980static struct ctl_table vm_table[] = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700981 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700982 .procname = "overcommit_memory",
983 .data = &sysctl_overcommit_memory,
984 .maxlen = sizeof(sysctl_overcommit_memory),
985 .mode = 0644,
Petr Holasekcb16e952011-03-23 16:43:09 -0700986 .proc_handler = proc_dointvec_minmax,
987 .extra1 = &zero,
988 .extra2 = &two,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700989 },
990 {
KAMEZAWA Hiroyukifadd8fb2006-06-23 02:03:13 -0700991 .procname = "panic_on_oom",
992 .data = &sysctl_panic_on_oom,
993 .maxlen = sizeof(sysctl_panic_on_oom),
994 .mode = 0644,
Petr Holasekcb16e952011-03-23 16:43:09 -0700995 .proc_handler = proc_dointvec_minmax,
996 .extra1 = &zero,
997 .extra2 = &two,
KAMEZAWA Hiroyukifadd8fb2006-06-23 02:03:13 -0700998 },
999 {
David Rientjesfe071d72007-10-16 23:25:56 -07001000 .procname = "oom_kill_allocating_task",
1001 .data = &sysctl_oom_kill_allocating_task,
1002 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1003 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001004 .proc_handler = proc_dointvec,
David Rientjesfe071d72007-10-16 23:25:56 -07001005 },
1006 {
David Rientjesfef1bdd2008-02-07 00:14:07 -08001007 .procname = "oom_dump_tasks",
1008 .data = &sysctl_oom_dump_tasks,
1009 .maxlen = sizeof(sysctl_oom_dump_tasks),
1010 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001011 .proc_handler = proc_dointvec,
David Rientjesfef1bdd2008-02-07 00:14:07 -08001012 },
1013 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001014 .procname = "overcommit_ratio",
1015 .data = &sysctl_overcommit_ratio,
1016 .maxlen = sizeof(sysctl_overcommit_ratio),
1017 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001018 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001019 },
1020 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001021 .procname = "page-cluster",
1022 .data = &page_cluster,
1023 .maxlen = sizeof(int),
1024 .mode = 0644,
Petr Holasekcb16e952011-03-23 16:43:09 -07001025 .proc_handler = proc_dointvec_minmax,
1026 .extra1 = &zero,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001027 },
1028 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001029 .procname = "dirty_background_ratio",
1030 .data = &dirty_background_ratio,
1031 .maxlen = sizeof(dirty_background_ratio),
1032 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001033 .proc_handler = dirty_background_ratio_handler,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001034 .extra1 = &zero,
1035 .extra2 = &one_hundred,
1036 },
1037 {
David Rientjes2da02992009-01-06 14:39:31 -08001038 .procname = "dirty_background_bytes",
1039 .data = &dirty_background_bytes,
1040 .maxlen = sizeof(dirty_background_bytes),
1041 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001042 .proc_handler = dirty_background_bytes_handler,
Sven Wegenerfc3501d2009-02-11 13:04:23 -08001043 .extra1 = &one_ul,
David Rientjes2da02992009-01-06 14:39:31 -08001044 },
1045 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001046 .procname = "dirty_ratio",
1047 .data = &vm_dirty_ratio,
1048 .maxlen = sizeof(vm_dirty_ratio),
1049 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001050 .proc_handler = dirty_ratio_handler,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001051 .extra1 = &zero,
1052 .extra2 = &one_hundred,
1053 },
1054 {
David Rientjes2da02992009-01-06 14:39:31 -08001055 .procname = "dirty_bytes",
1056 .data = &vm_dirty_bytes,
1057 .maxlen = sizeof(vm_dirty_bytes),
1058 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001059 .proc_handler = dirty_bytes_handler,
Andrea Righi9e4a5bd2009-04-30 15:08:57 -07001060 .extra1 = &dirty_bytes_min,
David Rientjes2da02992009-01-06 14:39:31 -08001061 },
1062 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001063 .procname = "dirty_writeback_centisecs",
Bart Samwelf6ef9432006-03-24 03:15:48 -08001064 .data = &dirty_writeback_interval,
1065 .maxlen = sizeof(dirty_writeback_interval),
Linus Torvalds1da177e2005-04-16 15:20:36 -07001066 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001067 .proc_handler = dirty_writeback_centisecs_handler,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001068 },
1069 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001070 .procname = "dirty_expire_centisecs",
Bart Samwelf6ef9432006-03-24 03:15:48 -08001071 .data = &dirty_expire_interval,
1072 .maxlen = sizeof(dirty_expire_interval),
Linus Torvalds1da177e2005-04-16 15:20:36 -07001073 .mode = 0644,
Petr Holasekcb16e952011-03-23 16:43:09 -07001074 .proc_handler = proc_dointvec_minmax,
1075 .extra1 = &zero,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001076 },
1077 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001078 .procname = "nr_pdflush_threads",
1079 .data = &nr_pdflush_threads,
1080 .maxlen = sizeof nr_pdflush_threads,
1081 .mode = 0444 /* read-only*/,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001082 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001083 },
1084 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001085 .procname = "swappiness",
1086 .data = &vm_swappiness,
1087 .maxlen = sizeof(vm_swappiness),
1088 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001089 .proc_handler = proc_dointvec_minmax,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001090 .extra1 = &zero,
1091 .extra2 = &one_hundred,
1092 },
1093#ifdef CONFIG_HUGETLB_PAGE
Lee Schermerhorn06808b02009-12-14 17:58:21 -08001094 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001095 .procname = "nr_hugepages",
Andi Kleene5ff2152008-07-23 21:27:42 -07001096 .data = NULL,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001097 .maxlen = sizeof(unsigned long),
1098 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001099 .proc_handler = hugetlb_sysctl_handler,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001100 .extra1 = (void *)&hugetlb_zero,
1101 .extra2 = (void *)&hugetlb_infinity,
Lee Schermerhorn06808b02009-12-14 17:58:21 -08001102 },
1103#ifdef CONFIG_NUMA
1104 {
1105 .procname = "nr_hugepages_mempolicy",
1106 .data = NULL,
1107 .maxlen = sizeof(unsigned long),
1108 .mode = 0644,
1109 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
1110 .extra1 = (void *)&hugetlb_zero,
1111 .extra2 = (void *)&hugetlb_infinity,
1112 },
1113#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001114 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001115 .procname = "hugetlb_shm_group",
1116 .data = &sysctl_hugetlb_shm_group,
1117 .maxlen = sizeof(gid_t),
1118 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001119 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001120 },
Mel Gorman396faf02007-07-17 04:03:13 -07001121 {
Mel Gorman396faf02007-07-17 04:03:13 -07001122 .procname = "hugepages_treat_as_movable",
1123 .data = &hugepages_treat_as_movable,
1124 .maxlen = sizeof(int),
1125 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001126 .proc_handler = hugetlb_treat_movable_handler,
Mel Gorman396faf02007-07-17 04:03:13 -07001127 },
Adam Litke54f9f802007-10-16 01:26:20 -07001128 {
Nishanth Aravamudand1c3fb12007-12-17 16:20:12 -08001129 .procname = "nr_overcommit_hugepages",
Andi Kleene5ff2152008-07-23 21:27:42 -07001130 .data = NULL,
1131 .maxlen = sizeof(unsigned long),
Nishanth Aravamudand1c3fb12007-12-17 16:20:12 -08001132 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001133 .proc_handler = hugetlb_overcommit_handler,
Andi Kleene5ff2152008-07-23 21:27:42 -07001134 .extra1 = (void *)&hugetlb_zero,
1135 .extra2 = (void *)&hugetlb_infinity,
Nishanth Aravamudand1c3fb12007-12-17 16:20:12 -08001136 },
Linus Torvalds1da177e2005-04-16 15:20:36 -07001137#endif
1138 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001139 .procname = "lowmem_reserve_ratio",
1140 .data = &sysctl_lowmem_reserve_ratio,
1141 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1142 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001143 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001144 },
1145 {
Andrew Morton9d0243b2006-01-08 01:00:39 -08001146 .procname = "drop_caches",
1147 .data = &sysctl_drop_caches,
1148 .maxlen = sizeof(int),
1149 .mode = 0644,
1150 .proc_handler = drop_caches_sysctl_handler,
Petr Holasekcb16e952011-03-23 16:43:09 -07001151 .extra1 = &one,
1152 .extra2 = &three,
Andrew Morton9d0243b2006-01-08 01:00:39 -08001153 },
Mel Gorman76ab0f52010-05-24 14:32:28 -07001154#ifdef CONFIG_COMPACTION
1155 {
1156 .procname = "compact_memory",
1157 .data = &sysctl_compact_memory,
1158 .maxlen = sizeof(int),
1159 .mode = 0200,
1160 .proc_handler = sysctl_compaction_handler,
1161 },
Mel Gorman5e771902010-05-24 14:32:31 -07001162 {
1163 .procname = "extfrag_threshold",
1164 .data = &sysctl_extfrag_threshold,
1165 .maxlen = sizeof(int),
1166 .mode = 0644,
1167 .proc_handler = sysctl_extfrag_handler,
1168 .extra1 = &min_extfrag_threshold,
1169 .extra2 = &max_extfrag_threshold,
1170 },
1171
Mel Gorman76ab0f52010-05-24 14:32:28 -07001172#endif /* CONFIG_COMPACTION */
Andrew Morton9d0243b2006-01-08 01:00:39 -08001173 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001174 .procname = "min_free_kbytes",
1175 .data = &min_free_kbytes,
1176 .maxlen = sizeof(min_free_kbytes),
1177 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001178 .proc_handler = min_free_kbytes_sysctl_handler,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001179 .extra1 = &zero,
1180 },
Rohit Seth8ad4b1f2006-01-08 01:00:40 -08001181 {
Rohit Seth8ad4b1f2006-01-08 01:00:40 -08001182 .procname = "percpu_pagelist_fraction",
1183 .data = &percpu_pagelist_fraction,
1184 .maxlen = sizeof(percpu_pagelist_fraction),
1185 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001186 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
Rohit Seth8ad4b1f2006-01-08 01:00:40 -08001187 .extra1 = &min_percpu_pagelist_fract,
1188 },
Linus Torvalds1da177e2005-04-16 15:20:36 -07001189#ifdef CONFIG_MMU
1190 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001191 .procname = "max_map_count",
1192 .data = &sysctl_max_map_count,
1193 .maxlen = sizeof(sysctl_max_map_count),
1194 .mode = 0644,
WANG Cong3e261202009-12-17 15:27:05 -08001195 .proc_handler = proc_dointvec_minmax,
Amerigo Wang70da2342009-12-14 17:59:52 -08001196 .extra1 = &zero,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001197 },
Paul Mundtdd8632a2009-01-08 12:04:47 +00001198#else
1199 {
Paul Mundtdd8632a2009-01-08 12:04:47 +00001200 .procname = "nr_trim_pages",
1201 .data = &sysctl_nr_trim_pages,
1202 .maxlen = sizeof(sysctl_nr_trim_pages),
1203 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001204 .proc_handler = proc_dointvec_minmax,
Paul Mundtdd8632a2009-01-08 12:04:47 +00001205 .extra1 = &zero,
1206 },
Linus Torvalds1da177e2005-04-16 15:20:36 -07001207#endif
1208 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001209 .procname = "laptop_mode",
1210 .data = &laptop_mode,
1211 .maxlen = sizeof(laptop_mode),
1212 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001213 .proc_handler = proc_dointvec_jiffies,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001214 },
1215 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001216 .procname = "block_dump",
1217 .data = &block_dump,
1218 .maxlen = sizeof(block_dump),
1219 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001220 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001221 .extra1 = &zero,
1222 },
1223 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001224 .procname = "vfs_cache_pressure",
1225 .data = &sysctl_vfs_cache_pressure,
1226 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1227 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001228 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001229 .extra1 = &zero,
1230 },
1231#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1232 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001233 .procname = "legacy_va_layout",
1234 .data = &sysctl_legacy_va_layout,
1235 .maxlen = sizeof(sysctl_legacy_va_layout),
1236 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001237 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001238 .extra1 = &zero,
1239 },
1240#endif
Christoph Lameter17436602006-01-18 17:42:32 -08001241#ifdef CONFIG_NUMA
1242 {
Christoph Lameter17436602006-01-18 17:42:32 -08001243 .procname = "zone_reclaim_mode",
1244 .data = &zone_reclaim_mode,
1245 .maxlen = sizeof(zone_reclaim_mode),
1246 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001247 .proc_handler = proc_dointvec,
Christoph Lameterc84db232006-02-01 03:05:29 -08001248 .extra1 = &zero,
Christoph Lameter17436602006-01-18 17:42:32 -08001249 },
Christoph Lameter96146342006-07-03 00:24:13 -07001250 {
Christoph Lameter96146342006-07-03 00:24:13 -07001251 .procname = "min_unmapped_ratio",
1252 .data = &sysctl_min_unmapped_ratio,
1253 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1254 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001255 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
Christoph Lameter96146342006-07-03 00:24:13 -07001256 .extra1 = &zero,
1257 .extra2 = &one_hundred,
1258 },
Christoph Lameter0ff38492006-09-25 23:31:52 -07001259 {
Christoph Lameter0ff38492006-09-25 23:31:52 -07001260 .procname = "min_slab_ratio",
1261 .data = &sysctl_min_slab_ratio,
1262 .maxlen = sizeof(sysctl_min_slab_ratio),
1263 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001264 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
Christoph Lameter0ff38492006-09-25 23:31:52 -07001265 .extra1 = &zero,
1266 .extra2 = &one_hundred,
1267 },
Christoph Lameter17436602006-01-18 17:42:32 -08001268#endif
Christoph Lameter77461ab2007-05-09 02:35:13 -07001269#ifdef CONFIG_SMP
1270 {
Christoph Lameter77461ab2007-05-09 02:35:13 -07001271 .procname = "stat_interval",
1272 .data = &sysctl_stat_interval,
1273 .maxlen = sizeof(sysctl_stat_interval),
1274 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001275 .proc_handler = proc_dointvec_jiffies,
Christoph Lameter77461ab2007-05-09 02:35:13 -07001276 },
1277#endif
David Howells6e141542009-12-15 19:27:45 +00001278#ifdef CONFIG_MMU
Eric Parised032182007-06-28 15:55:21 -04001279 {
Eric Parised032182007-06-28 15:55:21 -04001280 .procname = "mmap_min_addr",
Eric Paris788084a2009-07-31 12:54:11 -04001281 .data = &dac_mmap_min_addr,
1282 .maxlen = sizeof(unsigned long),
Eric Parised032182007-06-28 15:55:21 -04001283 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001284 .proc_handler = mmap_min_addr_handler,
Eric Parised032182007-06-28 15:55:21 -04001285 },
David Howells6e141542009-12-15 19:27:45 +00001286#endif
KAMEZAWA Hiroyukif0c0b2b2007-07-15 23:38:01 -07001287#ifdef CONFIG_NUMA
1288 {
KAMEZAWA Hiroyukif0c0b2b2007-07-15 23:38:01 -07001289 .procname = "numa_zonelist_order",
1290 .data = &numa_zonelist_order,
1291 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1292 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001293 .proc_handler = numa_zonelist_order_handler,
KAMEZAWA Hiroyukif0c0b2b2007-07-15 23:38:01 -07001294 },
1295#endif
Al Viro2b8232c2007-10-13 08:16:04 +01001296#if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
Paul Mundt5c36e652007-03-01 10:07:42 +09001297 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
Ingo Molnare6e54942006-06-27 02:53:50 -07001298 {
Ingo Molnare6e54942006-06-27 02:53:50 -07001299 .procname = "vdso_enabled",
1300 .data = &vdso_enabled,
1301 .maxlen = sizeof(vdso_enabled),
1302 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001303 .proc_handler = proc_dointvec,
Ingo Molnare6e54942006-06-27 02:53:50 -07001304 .extra1 = &zero,
1305 },
1306#endif
Bron Gondwana195cf4532008-02-04 22:29:20 -08001307#ifdef CONFIG_HIGHMEM
1308 {
Bron Gondwana195cf4532008-02-04 22:29:20 -08001309 .procname = "highmem_is_dirtyable",
1310 .data = &vm_highmem_is_dirtyable,
1311 .maxlen = sizeof(vm_highmem_is_dirtyable),
1312 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001313 .proc_handler = proc_dointvec_minmax,
Bron Gondwana195cf4532008-02-04 22:29:20 -08001314 .extra1 = &zero,
1315 .extra2 = &one,
1316 },
1317#endif
Peter Zijlstra4be6f6b2009-04-13 14:39:33 -07001318 {
Peter Zijlstra4be6f6b2009-04-13 14:39:33 -07001319 .procname = "scan_unevictable_pages",
1320 .data = &scan_unevictable_pages,
1321 .maxlen = sizeof(scan_unevictable_pages),
1322 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001323 .proc_handler = scan_unevictable_handler,
Peter Zijlstra4be6f6b2009-04-13 14:39:33 -07001324 },
Andi Kleen6a460792009-09-16 11:50:15 +02001325#ifdef CONFIG_MEMORY_FAILURE
1326 {
Andi Kleen6a460792009-09-16 11:50:15 +02001327 .procname = "memory_failure_early_kill",
1328 .data = &sysctl_memory_failure_early_kill,
1329 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1330 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001331 .proc_handler = proc_dointvec_minmax,
Andi Kleen6a460792009-09-16 11:50:15 +02001332 .extra1 = &zero,
1333 .extra2 = &one,
1334 },
1335 {
Andi Kleen6a460792009-09-16 11:50:15 +02001336 .procname = "memory_failure_recovery",
1337 .data = &sysctl_memory_failure_recovery,
1338 .maxlen = sizeof(sysctl_memory_failure_recovery),
1339 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001340 .proc_handler = proc_dointvec_minmax,
Andi Kleen6a460792009-09-16 11:50:15 +02001341 .extra1 = &zero,
1342 .extra2 = &one,
1343 },
1344#endif
Eric W. Biederman6fce56e2009-04-03 02:30:53 -07001345 { }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001346};
1347
Eric W. Biederman2abc26f2007-02-14 00:34:07 -08001348#if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
Eric W. Biedermand8217f02007-10-18 03:05:22 -07001349static struct ctl_table binfmt_misc_table[] = {
Eric W. Biederman6fce56e2009-04-03 02:30:53 -07001350 { }
Eric W. Biederman2abc26f2007-02-14 00:34:07 -08001351};
1352#endif
1353
Eric W. Biedermand8217f02007-10-18 03:05:22 -07001354static struct ctl_table fs_table[] = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001355 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001356 .procname = "inode-nr",
1357 .data = &inodes_stat,
1358 .maxlen = 2*sizeof(int),
1359 .mode = 0444,
Dave Chinnercffbc8a2010-10-23 05:03:02 -04001360 .proc_handler = proc_nr_inodes,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001361 },
1362 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001363 .procname = "inode-state",
1364 .data = &inodes_stat,
1365 .maxlen = 7*sizeof(int),
1366 .mode = 0444,
Dave Chinnercffbc8a2010-10-23 05:03:02 -04001367 .proc_handler = proc_nr_inodes,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001368 },
1369 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001370 .procname = "file-nr",
1371 .data = &files_stat,
Eric Dumazet518de9b2010-10-26 14:22:44 -07001372 .maxlen = sizeof(files_stat),
Linus Torvalds1da177e2005-04-16 15:20:36 -07001373 .mode = 0444,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001374 .proc_handler = proc_nr_files,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001375 },
1376 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001377 .procname = "file-max",
1378 .data = &files_stat.max_files,
Eric Dumazet518de9b2010-10-26 14:22:44 -07001379 .maxlen = sizeof(files_stat.max_files),
Linus Torvalds1da177e2005-04-16 15:20:36 -07001380 .mode = 0644,
Eric Dumazet518de9b2010-10-26 14:22:44 -07001381 .proc_handler = proc_doulongvec_minmax,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001382 },
1383 {
Eric Dumazet9cfe0152008-02-06 01:37:16 -08001384 .procname = "nr_open",
1385 .data = &sysctl_nr_open,
1386 .maxlen = sizeof(int),
1387 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001388 .proc_handler = proc_dointvec_minmax,
Al Viroeceea0b2008-05-10 10:08:32 -04001389 .extra1 = &sysctl_nr_open_min,
1390 .extra2 = &sysctl_nr_open_max,
Eric Dumazet9cfe0152008-02-06 01:37:16 -08001391 },
1392 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001393 .procname = "dentry-state",
1394 .data = &dentry_stat,
1395 .maxlen = 6*sizeof(int),
1396 .mode = 0444,
Christoph Hellwig312d3ca2010-10-10 05:36:23 -04001397 .proc_handler = proc_nr_dentry,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001398 },
1399 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001400 .procname = "overflowuid",
1401 .data = &fs_overflowuid,
1402 .maxlen = sizeof(int),
1403 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001404 .proc_handler = proc_dointvec_minmax,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001405 .extra1 = &minolduid,
1406 .extra2 = &maxolduid,
1407 },
1408 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001409 .procname = "overflowgid",
1410 .data = &fs_overflowgid,
1411 .maxlen = sizeof(int),
1412 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001413 .proc_handler = proc_dointvec_minmax,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001414 .extra1 = &minolduid,
1415 .extra2 = &maxolduid,
1416 },
Thomas Petazzonibfcd17a2008-08-06 15:12:22 +02001417#ifdef CONFIG_FILE_LOCKING
Linus Torvalds1da177e2005-04-16 15:20:36 -07001418 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001419 .procname = "leases-enable",
1420 .data = &leases_enable,
1421 .maxlen = sizeof(int),
1422 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001423 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001424 },
Thomas Petazzonibfcd17a2008-08-06 15:12:22 +02001425#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001426#ifdef CONFIG_DNOTIFY
1427 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001428 .procname = "dir-notify-enable",
1429 .data = &dir_notify_enable,
1430 .maxlen = sizeof(int),
1431 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001432 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001433 },
1434#endif
1435#ifdef CONFIG_MMU
Thomas Petazzonibfcd17a2008-08-06 15:12:22 +02001436#ifdef CONFIG_FILE_LOCKING
Linus Torvalds1da177e2005-04-16 15:20:36 -07001437 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001438 .procname = "lease-break-time",
1439 .data = &lease_break_time,
1440 .maxlen = sizeof(int),
1441 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001442 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001443 },
Thomas Petazzonibfcd17a2008-08-06 15:12:22 +02001444#endif
Thomas Petazzoniebf3f092008-10-15 22:05:12 -07001445#ifdef CONFIG_AIO
Linus Torvalds1da177e2005-04-16 15:20:36 -07001446 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001447 .procname = "aio-nr",
1448 .data = &aio_nr,
1449 .maxlen = sizeof(aio_nr),
1450 .mode = 0444,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001451 .proc_handler = proc_doulongvec_minmax,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001452 },
1453 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001454 .procname = "aio-max-nr",
1455 .data = &aio_max_nr,
1456 .maxlen = sizeof(aio_max_nr),
1457 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001458 .proc_handler = proc_doulongvec_minmax,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001459 },
Thomas Petazzoniebf3f092008-10-15 22:05:12 -07001460#endif /* CONFIG_AIO */
Amy Griffis2d9048e2006-06-01 13:10:59 -07001461#ifdef CONFIG_INOTIFY_USER
Robert Love0399cb02005-07-13 12:38:18 -04001462 {
Robert Love0399cb02005-07-13 12:38:18 -04001463 .procname = "inotify",
1464 .mode = 0555,
1465 .child = inotify_table,
1466 },
1467#endif
Davide Libenzi7ef99642008-12-01 13:13:55 -08001468#ifdef CONFIG_EPOLL
1469 {
1470 .procname = "epoll",
1471 .mode = 0555,
1472 .child = epoll_table,
1473 },
1474#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001475#endif
Alan Coxd6e71142005-06-23 00:09:43 -07001476 {
Alan Coxd6e71142005-06-23 00:09:43 -07001477 .procname = "suid_dumpable",
1478 .data = &suid_dumpable,
1479 .maxlen = sizeof(int),
1480 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001481 .proc_handler = proc_dointvec_minmax,
Matthew Wilcox8e654fb2009-04-02 16:58:33 -07001482 .extra1 = &zero,
1483 .extra2 = &two,
Alan Coxd6e71142005-06-23 00:09:43 -07001484 },
Eric W. Biederman2abc26f2007-02-14 00:34:07 -08001485#if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1486 {
Eric W. Biederman2abc26f2007-02-14 00:34:07 -08001487 .procname = "binfmt_misc",
1488 .mode = 0555,
1489 .child = binfmt_misc_table,
1490 },
1491#endif
Jens Axboeb492e952010-05-19 21:03:16 +02001492 {
Jens Axboeff9da692010-06-03 14:54:39 +02001493 .procname = "pipe-max-size",
1494 .data = &pipe_max_size,
Jens Axboeb492e952010-05-19 21:03:16 +02001495 .maxlen = sizeof(int),
1496 .mode = 0644,
Jens Axboeff9da692010-06-03 14:54:39 +02001497 .proc_handler = &pipe_proc_fn,
1498 .extra1 = &pipe_min_size,
Jens Axboeb492e952010-05-19 21:03:16 +02001499 },
Eric W. Biederman6fce56e2009-04-03 02:30:53 -07001500 { }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001501};
1502
Eric W. Biedermand8217f02007-10-18 03:05:22 -07001503static struct ctl_table debug_table[] = {
Heiko Carstensab3c68e2010-05-17 10:00:21 +02001504#if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_SPARC) || \
1505 defined(CONFIG_S390)
Masoud Asgharifard Sharbianiabd4f752007-07-22 11:12:28 +02001506 {
Masoud Asgharifard Sharbianiabd4f752007-07-22 11:12:28 +02001507 .procname = "exception-trace",
1508 .data = &show_unhandled_signals,
1509 .maxlen = sizeof(int),
1510 .mode = 0644,
1511 .proc_handler = proc_dointvec
1512 },
1513#endif
Masami Hiramatsub2be84d2010-02-25 08:34:15 -05001514#if defined(CONFIG_OPTPROBES)
1515 {
1516 .procname = "kprobes-optimization",
1517 .data = &sysctl_kprobes_optimization,
1518 .maxlen = sizeof(int),
1519 .mode = 0644,
1520 .proc_handler = proc_kprobes_optimization_handler,
1521 .extra1 = &zero,
1522 .extra2 = &one,
1523 },
1524#endif
Eric W. Biederman6fce56e2009-04-03 02:30:53 -07001525 { }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001526};
1527
Eric W. Biedermand8217f02007-10-18 03:05:22 -07001528static struct ctl_table dev_table[] = {
Eric W. Biederman6fce56e2009-04-03 02:30:53 -07001529 { }
Robert Love0eeca282005-07-12 17:06:03 -04001530};
Linus Torvalds1da177e2005-04-16 15:20:36 -07001531
Al Viro330d57f2005-11-04 10:18:40 +00001532static DEFINE_SPINLOCK(sysctl_lock);
1533
1534/* called under sysctl_lock */
1535static int use_table(struct ctl_table_header *p)
1536{
1537 if (unlikely(p->unregistering))
1538 return 0;
1539 p->used++;
1540 return 1;
1541}
1542
1543/* called under sysctl_lock */
1544static void unuse_table(struct ctl_table_header *p)
1545{
1546 if (!--p->used)
1547 if (unlikely(p->unregistering))
1548 complete(p->unregistering);
1549}
1550
1551/* called under sysctl_lock, will reacquire if has to wait */
1552static void start_unregistering(struct ctl_table_header *p)
1553{
1554 /*
1555 * if p->used is 0, nobody will ever touch that entry again;
1556 * we'll eliminate all paths to it before dropping sysctl_lock
1557 */
1558 if (unlikely(p->used)) {
1559 struct completion wait;
1560 init_completion(&wait);
1561 p->unregistering = &wait;
1562 spin_unlock(&sysctl_lock);
1563 wait_for_completion(&wait);
1564 spin_lock(&sysctl_lock);
Al Virof7e6ced2008-07-15 01:44:23 -04001565 } else {
1566 /* anything non-NULL; we'll never dereference it */
1567 p->unregistering = ERR_PTR(-EINVAL);
Al Viro330d57f2005-11-04 10:18:40 +00001568 }
1569 /*
1570 * do not remove from the list until nobody holds it; walking the
1571 * list in do_sysctl() relies on that.
1572 */
1573 list_del_init(&p->ctl_entry);
1574}
1575
Al Virof7e6ced2008-07-15 01:44:23 -04001576void sysctl_head_get(struct ctl_table_header *head)
1577{
1578 spin_lock(&sysctl_lock);
1579 head->count++;
1580 spin_unlock(&sysctl_lock);
1581}
1582
Al Virodfef6dcd32011-03-08 01:25:28 -05001583static void free_head(struct rcu_head *rcu)
1584{
1585 kfree(container_of(rcu, struct ctl_table_header, rcu));
1586}
1587
Al Virof7e6ced2008-07-15 01:44:23 -04001588void sysctl_head_put(struct ctl_table_header *head)
1589{
1590 spin_lock(&sysctl_lock);
1591 if (!--head->count)
Al Virodfef6dcd32011-03-08 01:25:28 -05001592 call_rcu(&head->rcu, free_head);
Al Virof7e6ced2008-07-15 01:44:23 -04001593 spin_unlock(&sysctl_lock);
1594}
1595
1596struct ctl_table_header *sysctl_head_grab(struct ctl_table_header *head)
1597{
1598 if (!head)
1599 BUG();
1600 spin_lock(&sysctl_lock);
1601 if (!use_table(head))
1602 head = ERR_PTR(-ENOENT);
1603 spin_unlock(&sysctl_lock);
1604 return head;
1605}
1606
Eric W. Biederman805b5d52007-02-14 00:34:11 -08001607void sysctl_head_finish(struct ctl_table_header *head)
1608{
1609 if (!head)
1610 return;
1611 spin_lock(&sysctl_lock);
1612 unuse_table(head);
1613 spin_unlock(&sysctl_lock);
1614}
1615
Al Viro73455092008-07-14 21:22:20 -04001616static struct ctl_table_set *
1617lookup_header_set(struct ctl_table_root *root, struct nsproxy *namespaces)
1618{
1619 struct ctl_table_set *set = &root->default_set;
1620 if (root->lookup)
1621 set = root->lookup(root, namespaces);
1622 return set;
1623}
1624
Eric W. Biedermane51b6ba2007-11-30 23:54:00 +11001625static struct list_head *
1626lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces)
Eric W. Biederman805b5d52007-02-14 00:34:11 -08001627{
Al Viro73455092008-07-14 21:22:20 -04001628 struct ctl_table_set *set = lookup_header_set(root, namespaces);
1629 return &set->list;
Eric W. Biedermane51b6ba2007-11-30 23:54:00 +11001630}
1631
1632struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces,
1633 struct ctl_table_header *prev)
1634{
1635 struct ctl_table_root *root;
1636 struct list_head *header_list;
Eric W. Biederman805b5d52007-02-14 00:34:11 -08001637 struct ctl_table_header *head;
1638 struct list_head *tmp;
Eric W. Biedermane51b6ba2007-11-30 23:54:00 +11001639
Eric W. Biederman805b5d52007-02-14 00:34:11 -08001640 spin_lock(&sysctl_lock);
1641 if (prev) {
Eric W. Biedermane51b6ba2007-11-30 23:54:00 +11001642 head = prev;
Eric W. Biederman805b5d52007-02-14 00:34:11 -08001643 tmp = &prev->ctl_entry;
1644 unuse_table(prev);
1645 goto next;
1646 }
1647 tmp = &root_table_header.ctl_entry;
1648 for (;;) {
1649 head = list_entry(tmp, struct ctl_table_header, ctl_entry);
1650
1651 if (!use_table(head))
1652 goto next;
1653 spin_unlock(&sysctl_lock);
1654 return head;
1655 next:
Eric W. Biedermane51b6ba2007-11-30 23:54:00 +11001656 root = head->root;
Eric W. Biederman805b5d52007-02-14 00:34:11 -08001657 tmp = tmp->next;
Eric W. Biedermane51b6ba2007-11-30 23:54:00 +11001658 header_list = lookup_header_list(root, namespaces);
1659 if (tmp != header_list)
1660 continue;
1661
1662 do {
1663 root = list_entry(root->root_list.next,
1664 struct ctl_table_root, root_list);
1665 if (root == &sysctl_table_root)
1666 goto out;
1667 header_list = lookup_header_list(root, namespaces);
1668 } while (list_empty(header_list));
1669 tmp = header_list->next;
Eric W. Biederman805b5d52007-02-14 00:34:11 -08001670 }
Eric W. Biedermane51b6ba2007-11-30 23:54:00 +11001671out:
Eric W. Biederman805b5d52007-02-14 00:34:11 -08001672 spin_unlock(&sysctl_lock);
1673 return NULL;
1674}
1675
Eric W. Biedermane51b6ba2007-11-30 23:54:00 +11001676struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev)
1677{
1678 return __sysctl_head_next(current->nsproxy, prev);
1679}
1680
1681void register_sysctl_root(struct ctl_table_root *root)
1682{
1683 spin_lock(&sysctl_lock);
1684 list_add_tail(&root->root_list, &sysctl_table_root.root_list);
1685 spin_unlock(&sysctl_lock);
1686}
1687
Linus Torvalds1da177e2005-04-16 15:20:36 -07001688/*
Eric W. Biederman1ff007e2007-02-14 00:34:11 -08001689 * sysctl_perm does NOT grant the superuser all rights automatically, because
Linus Torvalds1da177e2005-04-16 15:20:36 -07001690 * some sysctl variables are readonly even to root.
1691 */
1692
1693static int test_perm(int mode, int op)
1694{
David Howells76aac0e2008-11-14 10:39:12 +11001695 if (!current_euid())
Linus Torvalds1da177e2005-04-16 15:20:36 -07001696 mode >>= 6;
1697 else if (in_egroup_p(0))
1698 mode >>= 3;
Al Viroe6305c42008-07-15 21:03:57 -04001699 if ((op & ~mode & (MAY_READ|MAY_WRITE|MAY_EXEC)) == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001700 return 0;
1701 return -EACCES;
1702}
1703
Pavel Emelyanovd7321cd2008-04-29 01:02:44 -07001704int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001705{
Pavel Emelyanovd7321cd2008-04-29 01:02:44 -07001706 int mode;
1707
Pavel Emelyanovd7321cd2008-04-29 01:02:44 -07001708 if (root->permissions)
1709 mode = root->permissions(root, current->nsproxy, table);
1710 else
1711 mode = table->mode;
1712
1713 return test_perm(mode, op);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001714}
1715
Eric W. Biedermand912b0c2007-02-14 00:34:13 -08001716static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table)
1717{
Eric W. Biederman2315ffa2009-04-03 03:18:02 -07001718 for (; table->procname; table++) {
Eric W. Biedermand912b0c2007-02-14 00:34:13 -08001719 table->parent = parent;
1720 if (table->child)
1721 sysctl_set_parent(table, table->child);
1722 }
1723}
1724
1725static __init int sysctl_init(void)
1726{
1727 sysctl_set_parent(NULL, root_table);
Holger Schurig88f458e2008-04-29 01:02:36 -07001728#ifdef CONFIG_SYSCTL_SYSCALL_CHECK
Andi Kleenb3bd3de2010-08-10 14:17:51 -07001729 sysctl_check_table(current->nsproxy, root_table);
Holger Schurig88f458e2008-04-29 01:02:36 -07001730#endif
Eric W. Biedermand912b0c2007-02-14 00:34:13 -08001731 return 0;
1732}
1733
1734core_initcall(sysctl_init);
1735
Al Virobfbcf032008-07-27 06:31:22 +01001736static struct ctl_table *is_branch_in(struct ctl_table *branch,
1737 struct ctl_table *table)
Al Viroae7edec2008-07-15 06:33:31 -04001738{
1739 struct ctl_table *p;
1740 const char *s = branch->procname;
1741
1742 /* branch should have named subdirectory as its first element */
1743 if (!s || !branch->child)
Al Virobfbcf032008-07-27 06:31:22 +01001744 return NULL;
Al Viroae7edec2008-07-15 06:33:31 -04001745
1746 /* ... and nothing else */
Eric W. Biederman2315ffa2009-04-03 03:18:02 -07001747 if (branch[1].procname)
Al Virobfbcf032008-07-27 06:31:22 +01001748 return NULL;
Al Viroae7edec2008-07-15 06:33:31 -04001749
1750 /* table should contain subdirectory with the same name */
Eric W. Biederman2315ffa2009-04-03 03:18:02 -07001751 for (p = table; p->procname; p++) {
Al Viroae7edec2008-07-15 06:33:31 -04001752 if (!p->child)
1753 continue;
1754 if (p->procname && strcmp(p->procname, s) == 0)
Al Virobfbcf032008-07-27 06:31:22 +01001755 return p;
Al Viroae7edec2008-07-15 06:33:31 -04001756 }
Al Virobfbcf032008-07-27 06:31:22 +01001757 return NULL;
Al Viroae7edec2008-07-15 06:33:31 -04001758}
1759
1760/* see if attaching q to p would be an improvement */
1761static void try_attach(struct ctl_table_header *p, struct ctl_table_header *q)
1762{
1763 struct ctl_table *to = p->ctl_table, *by = q->ctl_table;
Al Virobfbcf032008-07-27 06:31:22 +01001764 struct ctl_table *next;
Al Viroae7edec2008-07-15 06:33:31 -04001765 int is_better = 0;
1766 int not_in_parent = !p->attached_by;
1767
Al Virobfbcf032008-07-27 06:31:22 +01001768 while ((next = is_branch_in(by, to)) != NULL) {
Al Viroae7edec2008-07-15 06:33:31 -04001769 if (by == q->attached_by)
1770 is_better = 1;
1771 if (to == p->attached_by)
1772 not_in_parent = 1;
1773 by = by->child;
Al Virobfbcf032008-07-27 06:31:22 +01001774 to = next->child;
Al Viroae7edec2008-07-15 06:33:31 -04001775 }
1776
1777 if (is_better && not_in_parent) {
1778 q->attached_by = by;
1779 q->attached_to = to;
1780 q->parent = p;
1781 }
1782}
1783
Linus Torvalds1da177e2005-04-16 15:20:36 -07001784/**
Eric W. Biedermane51b6ba2007-11-30 23:54:00 +11001785 * __register_sysctl_paths - register a sysctl hierarchy
1786 * @root: List of sysctl headers to register on
1787 * @namespaces: Data to compute which lists of sysctl entries are visible
Eric W. Biederman29e796f2007-11-30 23:50:18 +11001788 * @path: The path to the directory the sysctl table is in.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001789 * @table: the top-level table structure
Linus Torvalds1da177e2005-04-16 15:20:36 -07001790 *
1791 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
Eric W. Biederman29e796f2007-11-30 23:50:18 +11001792 * array. A completely 0 filled entry terminates the table.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001793 *
Eric W. Biedermand8217f02007-10-18 03:05:22 -07001794 * The members of the &struct ctl_table structure are used as follows:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001795 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07001796 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1797 * enter a sysctl file
1798 *
1799 * data - a pointer to data for use by proc_handler
1800 *
1801 * maxlen - the maximum size in bytes of the data
1802 *
1803 * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1804 *
1805 * child - a pointer to the child sysctl table if this entry is a directory, or
1806 * %NULL.
1807 *
1808 * proc_handler - the text handler routine (described below)
1809 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07001810 * de - for internal use by the sysctl routines
1811 *
1812 * extra1, extra2 - extra pointers usable by the proc handler routines
1813 *
1814 * Leaf nodes in the sysctl tree will be represented by a single file
1815 * under /proc; non-leaf nodes will be represented by directories.
1816 *
1817 * sysctl(2) can automatically manage read and write requests through
1818 * the sysctl table. The data and maxlen fields of the ctl_table
1819 * struct enable minimal validation of the values being written to be
1820 * performed, and the mode field allows minimal authentication.
1821 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07001822 * There must be a proc_handler routine for any terminal nodes
1823 * mirrored under /proc/sys (non-terminals are handled by a built-in
1824 * directory handler). Several default handlers are available to
1825 * cover common cases -
1826 *
1827 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1828 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1829 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1830 *
1831 * It is the handler's job to read the input buffer from user memory
1832 * and process it. The handler should return 0 on success.
1833 *
1834 * This routine returns %NULL on a failure to register, and a pointer
1835 * to the table header on success.
1836 */
Eric W. Biedermane51b6ba2007-11-30 23:54:00 +11001837struct ctl_table_header *__register_sysctl_paths(
1838 struct ctl_table_root *root,
1839 struct nsproxy *namespaces,
1840 const struct ctl_path *path, struct ctl_table *table)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001841{
Eric W. Biederman29e796f2007-11-30 23:50:18 +11001842 struct ctl_table_header *header;
1843 struct ctl_table *new, **prevp;
1844 unsigned int n, npath;
Al Viroae7edec2008-07-15 06:33:31 -04001845 struct ctl_table_set *set;
Eric W. Biederman29e796f2007-11-30 23:50:18 +11001846
1847 /* Count the path components */
Eric W. Biederman2315ffa2009-04-03 03:18:02 -07001848 for (npath = 0; path[npath].procname; ++npath)
Eric W. Biederman29e796f2007-11-30 23:50:18 +11001849 ;
1850
1851 /*
1852 * For each path component, allocate a 2-element ctl_table array.
1853 * The first array element will be filled with the sysctl entry
Eric W. Biederman2315ffa2009-04-03 03:18:02 -07001854 * for this, the second will be the sentinel (procname == 0).
Eric W. Biederman29e796f2007-11-30 23:50:18 +11001855 *
1856 * We allocate everything in one go so that we don't have to
1857 * worry about freeing additional memory in unregister_sysctl_table.
1858 */
1859 header = kzalloc(sizeof(struct ctl_table_header) +
1860 (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL);
1861 if (!header)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001862 return NULL;
Eric W. Biederman29e796f2007-11-30 23:50:18 +11001863
1864 new = (struct ctl_table *) (header + 1);
1865
1866 /* Now connect the dots */
1867 prevp = &header->ctl_table;
1868 for (n = 0; n < npath; ++n, ++path) {
1869 /* Copy the procname */
1870 new->procname = path->procname;
Eric W. Biederman29e796f2007-11-30 23:50:18 +11001871 new->mode = 0555;
1872
1873 *prevp = new;
1874 prevp = &new->child;
1875
1876 new += 2;
1877 }
1878 *prevp = table;
Eric W. Biederman23eb06d2007-11-30 23:52:10 +11001879 header->ctl_table_arg = table;
Eric W. Biederman29e796f2007-11-30 23:50:18 +11001880
1881 INIT_LIST_HEAD(&header->ctl_entry);
1882 header->used = 0;
1883 header->unregistering = NULL;
Eric W. Biedermane51b6ba2007-11-30 23:54:00 +11001884 header->root = root;
Eric W. Biederman29e796f2007-11-30 23:50:18 +11001885 sysctl_set_parent(NULL, header->ctl_table);
Al Virof7e6ced2008-07-15 01:44:23 -04001886 header->count = 1;
Holger Schurig88f458e2008-04-29 01:02:36 -07001887#ifdef CONFIG_SYSCTL_SYSCALL_CHECK
Eric W. Biedermane51b6ba2007-11-30 23:54:00 +11001888 if (sysctl_check_table(namespaces, header->ctl_table)) {
Eric W. Biederman29e796f2007-11-30 23:50:18 +11001889 kfree(header);
Eric W. Biedermanfc6cd252007-10-18 03:05:54 -07001890 return NULL;
1891 }
Holger Schurig88f458e2008-04-29 01:02:36 -07001892#endif
Al Viro330d57f2005-11-04 10:18:40 +00001893 spin_lock(&sysctl_lock);
Al Viro73455092008-07-14 21:22:20 -04001894 header->set = lookup_header_set(root, namespaces);
Al Viroae7edec2008-07-15 06:33:31 -04001895 header->attached_by = header->ctl_table;
1896 header->attached_to = root_table;
1897 header->parent = &root_table_header;
1898 for (set = header->set; set; set = set->parent) {
1899 struct ctl_table_header *p;
1900 list_for_each_entry(p, &set->list, ctl_entry) {
1901 if (p->unregistering)
1902 continue;
1903 try_attach(p, header);
1904 }
1905 }
1906 header->parent->count++;
Al Viro73455092008-07-14 21:22:20 -04001907 list_add_tail(&header->ctl_entry, &header->set->list);
Al Viro330d57f2005-11-04 10:18:40 +00001908 spin_unlock(&sysctl_lock);
Eric W. Biederman29e796f2007-11-30 23:50:18 +11001909
1910 return header;
1911}
1912
1913/**
Eric W. Biedermane51b6ba2007-11-30 23:54:00 +11001914 * register_sysctl_table_path - register a sysctl table hierarchy
1915 * @path: The path to the directory the sysctl table is in.
1916 * @table: the top-level table structure
1917 *
1918 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1919 * array. A completely 0 filled entry terminates the table.
1920 *
1921 * See __register_sysctl_paths for more details.
1922 */
1923struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1924 struct ctl_table *table)
1925{
1926 return __register_sysctl_paths(&sysctl_table_root, current->nsproxy,
1927 path, table);
1928}
1929
1930/**
Eric W. Biederman29e796f2007-11-30 23:50:18 +11001931 * register_sysctl_table - register a sysctl table hierarchy
1932 * @table: the top-level table structure
1933 *
1934 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1935 * array. A completely 0 filled entry terminates the table.
1936 *
1937 * See register_sysctl_paths for more details.
1938 */
1939struct ctl_table_header *register_sysctl_table(struct ctl_table *table)
1940{
1941 static const struct ctl_path null_path[] = { {} };
1942
1943 return register_sysctl_paths(null_path, table);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001944}
1945
1946/**
1947 * unregister_sysctl_table - unregister a sysctl table hierarchy
1948 * @header: the header returned from register_sysctl_table
1949 *
1950 * Unregisters the sysctl table and all children. proc entries may not
1951 * actually be removed until they are no longer used by anyone.
1952 */
1953void unregister_sysctl_table(struct ctl_table_header * header)
1954{
Al Viro330d57f2005-11-04 10:18:40 +00001955 might_sleep();
Pavel Emelyanovf1dad162007-12-04 23:45:24 -08001956
1957 if (header == NULL)
1958 return;
1959
Al Viro330d57f2005-11-04 10:18:40 +00001960 spin_lock(&sysctl_lock);
1961 start_unregistering(header);
Al Viroae7edec2008-07-15 06:33:31 -04001962 if (!--header->parent->count) {
1963 WARN_ON(1);
Al Virodfef6dcd32011-03-08 01:25:28 -05001964 call_rcu(&header->parent->rcu, free_head);
Al Viroae7edec2008-07-15 06:33:31 -04001965 }
Al Virof7e6ced2008-07-15 01:44:23 -04001966 if (!--header->count)
Al Virodfef6dcd32011-03-08 01:25:28 -05001967 call_rcu(&header->rcu, free_head);
Al Viro330d57f2005-11-04 10:18:40 +00001968 spin_unlock(&sysctl_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001969}
1970
Al Viro9043476f2008-07-15 08:54:06 -04001971int sysctl_is_seen(struct ctl_table_header *p)
1972{
1973 struct ctl_table_set *set = p->set;
1974 int res;
1975 spin_lock(&sysctl_lock);
1976 if (p->unregistering)
1977 res = 0;
1978 else if (!set->is_seen)
1979 res = 1;
1980 else
1981 res = set->is_seen(set);
1982 spin_unlock(&sysctl_lock);
1983 return res;
1984}
1985
Al Viro73455092008-07-14 21:22:20 -04001986void setup_sysctl_set(struct ctl_table_set *p,
1987 struct ctl_table_set *parent,
1988 int (*is_seen)(struct ctl_table_set *))
1989{
1990 INIT_LIST_HEAD(&p->list);
1991 p->parent = parent ? parent : &sysctl_table_root.default_set;
1992 p->is_seen = is_seen;
1993}
1994
Eric W. Biedermanb89a8172006-09-27 01:51:04 -07001995#else /* !CONFIG_SYSCTL */
Eric W. Biedermand8217f02007-10-18 03:05:22 -07001996struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
Eric W. Biedermanb89a8172006-09-27 01:51:04 -07001997{
1998 return NULL;
1999}
2000
Eric W. Biederman29e796f2007-11-30 23:50:18 +11002001struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
2002 struct ctl_table *table)
2003{
2004 return NULL;
2005}
2006
Eric W. Biedermanb89a8172006-09-27 01:51:04 -07002007void unregister_sysctl_table(struct ctl_table_header * table)
2008{
2009}
2010
Al Viro73455092008-07-14 21:22:20 -04002011void setup_sysctl_set(struct ctl_table_set *p,
2012 struct ctl_table_set *parent,
2013 int (*is_seen)(struct ctl_table_set *))
2014{
2015}
2016
Al Virof7e6ced2008-07-15 01:44:23 -04002017void sysctl_head_put(struct ctl_table_header *head)
2018{
2019}
2020
Eric W. Biedermanb89a8172006-09-27 01:51:04 -07002021#endif /* CONFIG_SYSCTL */
2022
Linus Torvalds1da177e2005-04-16 15:20:36 -07002023/*
2024 * /proc/sys support
2025 */
2026
Eric W. Biedermanb89a8172006-09-27 01:51:04 -07002027#ifdef CONFIG_PROC_SYSCTL
Linus Torvalds1da177e2005-04-16 15:20:36 -07002028
Adrian Bunkb1ba4dd2006-10-02 02:18:05 -07002029static int _proc_do_string(void* data, int maxlen, int write,
Alexey Dobriyan8d65af72009-09-23 15:57:19 -07002030 void __user *buffer,
Adrian Bunkb1ba4dd2006-10-02 02:18:05 -07002031 size_t *lenp, loff_t *ppos)
Sam Vilainf5dd3d62006-10-02 02:18:04 -07002032{
2033 size_t len;
2034 char __user *p;
2035 char c;
Oleg Nesterov8d060872007-02-10 01:46:38 -08002036
2037 if (!data || !maxlen || !*lenp) {
Sam Vilainf5dd3d62006-10-02 02:18:04 -07002038 *lenp = 0;
2039 return 0;
2040 }
Oleg Nesterov8d060872007-02-10 01:46:38 -08002041
Sam Vilainf5dd3d62006-10-02 02:18:04 -07002042 if (write) {
2043 len = 0;
2044 p = buffer;
2045 while (len < *lenp) {
2046 if (get_user(c, p++))
2047 return -EFAULT;
2048 if (c == 0 || c == '\n')
2049 break;
2050 len++;
2051 }
2052 if (len >= maxlen)
2053 len = maxlen-1;
2054 if(copy_from_user(data, buffer, len))
2055 return -EFAULT;
2056 ((char *) data)[len] = 0;
2057 *ppos += *lenp;
2058 } else {
2059 len = strlen(data);
2060 if (len > maxlen)
2061 len = maxlen;
Oleg Nesterov8d060872007-02-10 01:46:38 -08002062
2063 if (*ppos > len) {
2064 *lenp = 0;
2065 return 0;
2066 }
2067
2068 data += *ppos;
2069 len -= *ppos;
2070
Sam Vilainf5dd3d62006-10-02 02:18:04 -07002071 if (len > *lenp)
2072 len = *lenp;
2073 if (len)
2074 if(copy_to_user(buffer, data, len))
2075 return -EFAULT;
2076 if (len < *lenp) {
2077 if(put_user('\n', ((char __user *) buffer) + len))
2078 return -EFAULT;
2079 len++;
2080 }
2081 *lenp = len;
2082 *ppos += len;
2083 }
2084 return 0;
2085}
2086
Linus Torvalds1da177e2005-04-16 15:20:36 -07002087/**
2088 * proc_dostring - read a string sysctl
2089 * @table: the sysctl table
2090 * @write: %TRUE if this is a write to the sysctl file
Linus Torvalds1da177e2005-04-16 15:20:36 -07002091 * @buffer: the user buffer
2092 * @lenp: the size of the user buffer
2093 * @ppos: file position
2094 *
2095 * Reads/writes a string from/to the user buffer. If the kernel
2096 * buffer provided is not large enough to hold the string, the
2097 * string is truncated. The copied string is %NULL-terminated.
2098 * If the string is being read by the user process, it is copied
2099 * and a newline '\n' is added. It is truncated if the buffer is
2100 * not large enough.
2101 *
2102 * Returns 0 on success.
2103 */
Alexey Dobriyan8d65af72009-09-23 15:57:19 -07002104int proc_dostring(struct ctl_table *table, int write,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002105 void __user *buffer, size_t *lenp, loff_t *ppos)
2106{
Alexey Dobriyan8d65af72009-09-23 15:57:19 -07002107 return _proc_do_string(table->data, table->maxlen, write,
Sam Vilainf5dd3d62006-10-02 02:18:04 -07002108 buffer, lenp, ppos);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002109}
2110
Amerigo Wang00b7c332010-05-05 00:26:45 +00002111static size_t proc_skip_spaces(char **buf)
2112{
2113 size_t ret;
2114 char *tmp = skip_spaces(*buf);
2115 ret = tmp - *buf;
2116 *buf = tmp;
2117 return ret;
2118}
Linus Torvalds1da177e2005-04-16 15:20:36 -07002119
Octavian Purdila9f977fb2010-05-05 00:26:55 +00002120static void proc_skip_char(char **buf, size_t *size, const char v)
2121{
2122 while (*size) {
2123 if (**buf != v)
2124 break;
2125 (*size)--;
2126 (*buf)++;
2127 }
2128}
2129
Amerigo Wang00b7c332010-05-05 00:26:45 +00002130#define TMPBUFLEN 22
2131/**
Randy Dunlap0fc377b2010-05-21 11:29:53 -07002132 * proc_get_long - reads an ASCII formatted integer from a user buffer
Amerigo Wang00b7c332010-05-05 00:26:45 +00002133 *
Randy Dunlap0fc377b2010-05-21 11:29:53 -07002134 * @buf: a kernel buffer
2135 * @size: size of the kernel buffer
2136 * @val: this is where the number will be stored
2137 * @neg: set to %TRUE if number is negative
2138 * @perm_tr: a vector which contains the allowed trailers
2139 * @perm_tr_len: size of the perm_tr vector
2140 * @tr: pointer to store the trailer character
Amerigo Wang00b7c332010-05-05 00:26:45 +00002141 *
Randy Dunlap0fc377b2010-05-21 11:29:53 -07002142 * In case of success %0 is returned and @buf and @size are updated with
2143 * the amount of bytes read. If @tr is non-NULL and a trailing
2144 * character exists (size is non-zero after returning from this
2145 * function), @tr is updated with the trailing character.
Amerigo Wang00b7c332010-05-05 00:26:45 +00002146 */
2147static int proc_get_long(char **buf, size_t *size,
2148 unsigned long *val, bool *neg,
2149 const char *perm_tr, unsigned perm_tr_len, char *tr)
2150{
2151 int len;
2152 char *p, tmp[TMPBUFLEN];
2153
2154 if (!*size)
2155 return -EINVAL;
2156
2157 len = *size;
2158 if (len > TMPBUFLEN - 1)
2159 len = TMPBUFLEN - 1;
2160
2161 memcpy(tmp, *buf, len);
2162
2163 tmp[len] = 0;
2164 p = tmp;
2165 if (*p == '-' && *size > 1) {
2166 *neg = true;
2167 p++;
2168 } else
2169 *neg = false;
2170 if (!isdigit(*p))
2171 return -EINVAL;
2172
2173 *val = simple_strtoul(p, &p, 0);
2174
2175 len = p - tmp;
2176
2177 /* We don't know if the next char is whitespace thus we may accept
2178 * invalid integers (e.g. 1234...a) or two integers instead of one
2179 * (e.g. 123...1). So lets not allow such large numbers. */
2180 if (len == TMPBUFLEN - 1)
2181 return -EINVAL;
2182
2183 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
2184 return -EINVAL;
2185
2186 if (tr && (len < *size))
2187 *tr = *p;
2188
2189 *buf += len;
2190 *size -= len;
2191
2192 return 0;
2193}
2194
2195/**
Randy Dunlap0fc377b2010-05-21 11:29:53 -07002196 * proc_put_long - converts an integer to a decimal ASCII formatted string
Amerigo Wang00b7c332010-05-05 00:26:45 +00002197 *
Randy Dunlap0fc377b2010-05-21 11:29:53 -07002198 * @buf: the user buffer
2199 * @size: the size of the user buffer
2200 * @val: the integer to be converted
2201 * @neg: sign of the number, %TRUE for negative
Amerigo Wang00b7c332010-05-05 00:26:45 +00002202 *
Randy Dunlap0fc377b2010-05-21 11:29:53 -07002203 * In case of success %0 is returned and @buf and @size are updated with
2204 * the amount of bytes written.
Amerigo Wang00b7c332010-05-05 00:26:45 +00002205 */
2206static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
2207 bool neg)
2208{
2209 int len;
2210 char tmp[TMPBUFLEN], *p = tmp;
2211
2212 sprintf(p, "%s%lu", neg ? "-" : "", val);
2213 len = strlen(tmp);
2214 if (len > *size)
2215 len = *size;
2216 if (copy_to_user(*buf, tmp, len))
2217 return -EFAULT;
2218 *size -= len;
2219 *buf += len;
2220 return 0;
2221}
2222#undef TMPBUFLEN
2223
2224static int proc_put_char(void __user **buf, size_t *size, char c)
2225{
2226 if (*size) {
2227 char __user **buffer = (char __user **)buf;
2228 if (put_user(c, *buffer))
2229 return -EFAULT;
2230 (*size)--, (*buffer)++;
2231 *buf = *buffer;
2232 }
2233 return 0;
2234}
2235
2236static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002237 int *valp,
2238 int write, void *data)
2239{
2240 if (write) {
2241 *valp = *negp ? -*lvalp : *lvalp;
2242 } else {
2243 int val = *valp;
2244 if (val < 0) {
Amerigo Wang00b7c332010-05-05 00:26:45 +00002245 *negp = true;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002246 *lvalp = (unsigned long)-val;
2247 } else {
Amerigo Wang00b7c332010-05-05 00:26:45 +00002248 *negp = false;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002249 *lvalp = (unsigned long)val;
2250 }
2251 }
2252 return 0;
2253}
2254
Amerigo Wang00b7c332010-05-05 00:26:45 +00002255static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
2256
Eric W. Biedermand8217f02007-10-18 03:05:22 -07002257static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
Alexey Dobriyan8d65af72009-09-23 15:57:19 -07002258 int write, void __user *buffer,
Kirill Korotaevfcfbd542006-10-02 02:18:23 -07002259 size_t *lenp, loff_t *ppos,
Amerigo Wang00b7c332010-05-05 00:26:45 +00002260 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002261 int write, void *data),
2262 void *data)
2263{
Amerigo Wang00b7c332010-05-05 00:26:45 +00002264 int *i, vleft, first = 1, err = 0;
2265 unsigned long page = 0;
2266 size_t left;
2267 char *kbuf;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002268
Amerigo Wang00b7c332010-05-05 00:26:45 +00002269 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002270 *lenp = 0;
2271 return 0;
2272 }
2273
Kirill Korotaevfcfbd542006-10-02 02:18:23 -07002274 i = (int *) tbl_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002275 vleft = table->maxlen / sizeof(*i);
2276 left = *lenp;
2277
2278 if (!conv)
2279 conv = do_proc_dointvec_conv;
2280
Linus Torvalds1da177e2005-04-16 15:20:36 -07002281 if (write) {
Amerigo Wang00b7c332010-05-05 00:26:45 +00002282 if (left > PAGE_SIZE - 1)
2283 left = PAGE_SIZE - 1;
2284 page = __get_free_page(GFP_TEMPORARY);
2285 kbuf = (char *) page;
2286 if (!kbuf)
2287 return -ENOMEM;
2288 if (copy_from_user(kbuf, buffer, left)) {
2289 err = -EFAULT;
2290 goto free;
2291 }
2292 kbuf[left] = 0;
2293 }
2294
2295 for (; left && vleft--; i++, first=0) {
2296 unsigned long lval;
2297 bool neg;
2298
2299 if (write) {
2300 left -= proc_skip_spaces(&kbuf);
2301
J. R. Okajima563b0462010-05-25 16:10:14 -07002302 if (!left)
2303 break;
Amerigo Wang00b7c332010-05-05 00:26:45 +00002304 err = proc_get_long(&kbuf, &left, &lval, &neg,
2305 proc_wspace_sep,
2306 sizeof(proc_wspace_sep), NULL);
2307 if (err)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002308 break;
Amerigo Wang00b7c332010-05-05 00:26:45 +00002309 if (conv(&neg, &lval, i, 1, data)) {
2310 err = -EINVAL;
2311 break;
2312 }
2313 } else {
2314 if (conv(&neg, &lval, i, 0, data)) {
2315 err = -EINVAL;
2316 break;
2317 }
2318 if (!first)
2319 err = proc_put_char(&buffer, &left, '\t');
2320 if (err)
2321 break;
2322 err = proc_put_long(&buffer, &left, lval, neg);
2323 if (err)
2324 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002325 }
2326 }
Amerigo Wang00b7c332010-05-05 00:26:45 +00002327
2328 if (!write && !first && left && !err)
2329 err = proc_put_char(&buffer, &left, '\n');
J. R. Okajima563b0462010-05-25 16:10:14 -07002330 if (write && !err && left)
Amerigo Wang00b7c332010-05-05 00:26:45 +00002331 left -= proc_skip_spaces(&kbuf);
2332free:
2333 if (write) {
2334 free_page(page);
2335 if (first)
2336 return err ? : -EINVAL;
2337 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002338 *lenp -= left;
2339 *ppos += *lenp;
Amerigo Wang00b7c332010-05-05 00:26:45 +00002340 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002341}
2342
Alexey Dobriyan8d65af72009-09-23 15:57:19 -07002343static int do_proc_dointvec(struct ctl_table *table, int write,
Kirill Korotaevfcfbd542006-10-02 02:18:23 -07002344 void __user *buffer, size_t *lenp, loff_t *ppos,
Amerigo Wang00b7c332010-05-05 00:26:45 +00002345 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
Kirill Korotaevfcfbd542006-10-02 02:18:23 -07002346 int write, void *data),
2347 void *data)
2348{
Alexey Dobriyan8d65af72009-09-23 15:57:19 -07002349 return __do_proc_dointvec(table->data, table, write,
Kirill Korotaevfcfbd542006-10-02 02:18:23 -07002350 buffer, lenp, ppos, conv, data);
2351}
2352
Linus Torvalds1da177e2005-04-16 15:20:36 -07002353/**
2354 * proc_dointvec - read a vector of integers
2355 * @table: the sysctl table
2356 * @write: %TRUE if this is a write to the sysctl file
Linus Torvalds1da177e2005-04-16 15:20:36 -07002357 * @buffer: the user buffer
2358 * @lenp: the size of the user buffer
2359 * @ppos: file position
2360 *
2361 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2362 * values from/to the user buffer, treated as an ASCII string.
2363 *
2364 * Returns 0 on success.
2365 */
Alexey Dobriyan8d65af72009-09-23 15:57:19 -07002366int proc_dointvec(struct ctl_table *table, int write,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002367 void __user *buffer, size_t *lenp, loff_t *ppos)
2368{
Alexey Dobriyan8d65af72009-09-23 15:57:19 -07002369 return do_proc_dointvec(table,write,buffer,lenp,ppos,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002370 NULL,NULL);
2371}
2372
Theodore Ts'o34f5a392007-02-10 01:45:24 -08002373/*
Andi Kleen25ddbb12008-10-15 22:01:41 -07002374 * Taint values can only be increased
2375 * This means we can safely use a temporary.
Theodore Ts'o34f5a392007-02-10 01:45:24 -08002376 */
Alexey Dobriyan8d65af72009-09-23 15:57:19 -07002377static int proc_taint(struct ctl_table *table, int write,
Theodore Ts'o34f5a392007-02-10 01:45:24 -08002378 void __user *buffer, size_t *lenp, loff_t *ppos)
2379{
Andi Kleen25ddbb12008-10-15 22:01:41 -07002380 struct ctl_table t;
2381 unsigned long tmptaint = get_taint();
2382 int err;
Theodore Ts'o34f5a392007-02-10 01:45:24 -08002383
Bastian Blank91fcd412007-04-23 14:41:14 -07002384 if (write && !capable(CAP_SYS_ADMIN))
Theodore Ts'o34f5a392007-02-10 01:45:24 -08002385 return -EPERM;
2386
Andi Kleen25ddbb12008-10-15 22:01:41 -07002387 t = *table;
2388 t.data = &tmptaint;
Alexey Dobriyan8d65af72009-09-23 15:57:19 -07002389 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
Andi Kleen25ddbb12008-10-15 22:01:41 -07002390 if (err < 0)
2391 return err;
2392
2393 if (write) {
2394 /*
2395 * Poor man's atomic or. Not worth adding a primitive
2396 * to everyone's atomic.h for this
2397 */
2398 int i;
2399 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2400 if ((tmptaint >> i) & 1)
2401 add_taint(i);
2402 }
2403 }
2404
2405 return err;
Theodore Ts'o34f5a392007-02-10 01:45:24 -08002406}
2407
Richard Weinbergerbfdc0b42011-03-23 16:43:11 -07002408#ifdef CONFIG_PRINTK
2409static int proc_dmesg_restrict(struct ctl_table *table, int write,
2410 void __user *buffer, size_t *lenp, loff_t *ppos)
2411{
2412 if (write && !capable(CAP_SYS_ADMIN))
2413 return -EPERM;
2414
2415 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2416}
2417#endif
2418
Linus Torvalds1da177e2005-04-16 15:20:36 -07002419struct do_proc_dointvec_minmax_conv_param {
2420 int *min;
2421 int *max;
2422};
2423
Amerigo Wang00b7c332010-05-05 00:26:45 +00002424static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2425 int *valp,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002426 int write, void *data)
2427{
2428 struct do_proc_dointvec_minmax_conv_param *param = data;
2429 if (write) {
2430 int val = *negp ? -*lvalp : *lvalp;
2431 if ((param->min && *param->min > val) ||
2432 (param->max && *param->max < val))
2433 return -EINVAL;
2434 *valp = val;
2435 } else {
2436 int val = *valp;
2437 if (val < 0) {
Amerigo Wang00b7c332010-05-05 00:26:45 +00002438 *negp = true;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002439 *lvalp = (unsigned long)-val;
2440 } else {
Amerigo Wang00b7c332010-05-05 00:26:45 +00002441 *negp = false;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002442 *lvalp = (unsigned long)val;
2443 }
2444 }
2445 return 0;
2446}
2447
2448/**
2449 * proc_dointvec_minmax - read a vector of integers with min/max values
2450 * @table: the sysctl table
2451 * @write: %TRUE if this is a write to the sysctl file
Linus Torvalds1da177e2005-04-16 15:20:36 -07002452 * @buffer: the user buffer
2453 * @lenp: the size of the user buffer
2454 * @ppos: file position
2455 *
2456 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2457 * values from/to the user buffer, treated as an ASCII string.
2458 *
2459 * This routine will ensure the values are within the range specified by
2460 * table->extra1 (min) and table->extra2 (max).
2461 *
2462 * Returns 0 on success.
2463 */
Alexey Dobriyan8d65af72009-09-23 15:57:19 -07002464int proc_dointvec_minmax(struct ctl_table *table, int write,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002465 void __user *buffer, size_t *lenp, loff_t *ppos)
2466{
2467 struct do_proc_dointvec_minmax_conv_param param = {
2468 .min = (int *) table->extra1,
2469 .max = (int *) table->extra2,
2470 };
Alexey Dobriyan8d65af72009-09-23 15:57:19 -07002471 return do_proc_dointvec(table, write, buffer, lenp, ppos,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002472 do_proc_dointvec_minmax_conv, &param);
2473}
2474
Eric W. Biedermand8217f02007-10-18 03:05:22 -07002475static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002476 void __user *buffer,
2477 size_t *lenp, loff_t *ppos,
2478 unsigned long convmul,
2479 unsigned long convdiv)
2480{
Amerigo Wang00b7c332010-05-05 00:26:45 +00002481 unsigned long *i, *min, *max;
2482 int vleft, first = 1, err = 0;
2483 unsigned long page = 0;
2484 size_t left;
2485 char *kbuf;
2486
2487 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002488 *lenp = 0;
2489 return 0;
2490 }
Amerigo Wang00b7c332010-05-05 00:26:45 +00002491
Kirill Korotaevfcfbd542006-10-02 02:18:23 -07002492 i = (unsigned long *) data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002493 min = (unsigned long *) table->extra1;
2494 max = (unsigned long *) table->extra2;
2495 vleft = table->maxlen / sizeof(unsigned long);
2496 left = *lenp;
Amerigo Wang00b7c332010-05-05 00:26:45 +00002497
2498 if (write) {
2499 if (left > PAGE_SIZE - 1)
2500 left = PAGE_SIZE - 1;
2501 page = __get_free_page(GFP_TEMPORARY);
2502 kbuf = (char *) page;
2503 if (!kbuf)
2504 return -ENOMEM;
2505 if (copy_from_user(kbuf, buffer, left)) {
2506 err = -EFAULT;
2507 goto free;
2508 }
2509 kbuf[left] = 0;
2510 }
2511
Eric Dumazet27b3d802010-10-07 12:59:29 -07002512 for (; left && vleft--; i++, first = 0) {
Amerigo Wang00b7c332010-05-05 00:26:45 +00002513 unsigned long val;
2514
Linus Torvalds1da177e2005-04-16 15:20:36 -07002515 if (write) {
Amerigo Wang00b7c332010-05-05 00:26:45 +00002516 bool neg;
2517
2518 left -= proc_skip_spaces(&kbuf);
2519
2520 err = proc_get_long(&kbuf, &left, &val, &neg,
2521 proc_wspace_sep,
2522 sizeof(proc_wspace_sep), NULL);
2523 if (err)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002524 break;
2525 if (neg)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002526 continue;
2527 if ((min && val < *min) || (max && val > *max))
2528 continue;
2529 *i = val;
2530 } else {
Amerigo Wang00b7c332010-05-05 00:26:45 +00002531 val = convdiv * (*i) / convmul;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002532 if (!first)
Amerigo Wang00b7c332010-05-05 00:26:45 +00002533 err = proc_put_char(&buffer, &left, '\t');
2534 err = proc_put_long(&buffer, &left, val, false);
2535 if (err)
2536 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002537 }
2538 }
2539
Amerigo Wang00b7c332010-05-05 00:26:45 +00002540 if (!write && !first && left && !err)
2541 err = proc_put_char(&buffer, &left, '\n');
2542 if (write && !err)
2543 left -= proc_skip_spaces(&kbuf);
2544free:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002545 if (write) {
Amerigo Wang00b7c332010-05-05 00:26:45 +00002546 free_page(page);
2547 if (first)
2548 return err ? : -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002549 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002550 *lenp -= left;
2551 *ppos += *lenp;
Amerigo Wang00b7c332010-05-05 00:26:45 +00002552 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002553}
2554
Eric W. Biedermand8217f02007-10-18 03:05:22 -07002555static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
Kirill Korotaevfcfbd542006-10-02 02:18:23 -07002556 void __user *buffer,
2557 size_t *lenp, loff_t *ppos,
2558 unsigned long convmul,
2559 unsigned long convdiv)
2560{
2561 return __do_proc_doulongvec_minmax(table->data, table, write,
Alexey Dobriyan8d65af72009-09-23 15:57:19 -07002562 buffer, lenp, ppos, convmul, convdiv);
Kirill Korotaevfcfbd542006-10-02 02:18:23 -07002563}
2564
Linus Torvalds1da177e2005-04-16 15:20:36 -07002565/**
2566 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2567 * @table: the sysctl table
2568 * @write: %TRUE if this is a write to the sysctl file
Linus Torvalds1da177e2005-04-16 15:20:36 -07002569 * @buffer: the user buffer
2570 * @lenp: the size of the user buffer
2571 * @ppos: file position
2572 *
2573 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2574 * values from/to the user buffer, treated as an ASCII string.
2575 *
2576 * This routine will ensure the values are within the range specified by
2577 * table->extra1 (min) and table->extra2 (max).
2578 *
2579 * Returns 0 on success.
2580 */
Alexey Dobriyan8d65af72009-09-23 15:57:19 -07002581int proc_doulongvec_minmax(struct ctl_table *table, int write,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002582 void __user *buffer, size_t *lenp, loff_t *ppos)
2583{
Alexey Dobriyan8d65af72009-09-23 15:57:19 -07002584 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002585}
2586
2587/**
2588 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2589 * @table: the sysctl table
2590 * @write: %TRUE if this is a write to the sysctl file
Linus Torvalds1da177e2005-04-16 15:20:36 -07002591 * @buffer: the user buffer
2592 * @lenp: the size of the user buffer
2593 * @ppos: file position
2594 *
2595 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2596 * values from/to the user buffer, treated as an ASCII string. The values
2597 * are treated as milliseconds, and converted to jiffies when they are stored.
2598 *
2599 * This routine will ensure the values are within the range specified by
2600 * table->extra1 (min) and table->extra2 (max).
2601 *
2602 * Returns 0 on success.
2603 */
Eric W. Biedermand8217f02007-10-18 03:05:22 -07002604int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002605 void __user *buffer,
2606 size_t *lenp, loff_t *ppos)
2607{
Alexey Dobriyan8d65af72009-09-23 15:57:19 -07002608 return do_proc_doulongvec_minmax(table, write, buffer,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002609 lenp, ppos, HZ, 1000l);
2610}
2611
2612
Amerigo Wang00b7c332010-05-05 00:26:45 +00002613static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002614 int *valp,
2615 int write, void *data)
2616{
2617 if (write) {
Bart Samwelcba9f332006-03-24 03:15:50 -08002618 if (*lvalp > LONG_MAX / HZ)
2619 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002620 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2621 } else {
2622 int val = *valp;
2623 unsigned long lval;
2624 if (val < 0) {
Amerigo Wang00b7c332010-05-05 00:26:45 +00002625 *negp = true;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002626 lval = (unsigned long)-val;
2627 } else {
Amerigo Wang00b7c332010-05-05 00:26:45 +00002628 *negp = false;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002629 lval = (unsigned long)val;
2630 }
2631 *lvalp = lval / HZ;
2632 }
2633 return 0;
2634}
2635
Amerigo Wang00b7c332010-05-05 00:26:45 +00002636static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002637 int *valp,
2638 int write, void *data)
2639{
2640 if (write) {
Bart Samwelcba9f332006-03-24 03:15:50 -08002641 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2642 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002643 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2644 } else {
2645 int val = *valp;
2646 unsigned long lval;
2647 if (val < 0) {
Amerigo Wang00b7c332010-05-05 00:26:45 +00002648 *negp = true;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002649 lval = (unsigned long)-val;
2650 } else {
Amerigo Wang00b7c332010-05-05 00:26:45 +00002651 *negp = false;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002652 lval = (unsigned long)val;
2653 }
2654 *lvalp = jiffies_to_clock_t(lval);
2655 }
2656 return 0;
2657}
2658
Amerigo Wang00b7c332010-05-05 00:26:45 +00002659static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002660 int *valp,
2661 int write, void *data)
2662{
2663 if (write) {
2664 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2665 } else {
2666 int val = *valp;
2667 unsigned long lval;
2668 if (val < 0) {
Amerigo Wang00b7c332010-05-05 00:26:45 +00002669 *negp = true;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002670 lval = (unsigned long)-val;
2671 } else {
Amerigo Wang00b7c332010-05-05 00:26:45 +00002672 *negp = false;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002673 lval = (unsigned long)val;
2674 }
2675 *lvalp = jiffies_to_msecs(lval);
2676 }
2677 return 0;
2678}
2679
2680/**
2681 * proc_dointvec_jiffies - read a vector of integers as seconds
2682 * @table: the sysctl table
2683 * @write: %TRUE if this is a write to the sysctl file
Linus Torvalds1da177e2005-04-16 15:20:36 -07002684 * @buffer: the user buffer
2685 * @lenp: the size of the user buffer
2686 * @ppos: file position
2687 *
2688 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2689 * values from/to the user buffer, treated as an ASCII string.
2690 * The values read are assumed to be in seconds, and are converted into
2691 * jiffies.
2692 *
2693 * Returns 0 on success.
2694 */
Alexey Dobriyan8d65af72009-09-23 15:57:19 -07002695int proc_dointvec_jiffies(struct ctl_table *table, int write,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002696 void __user *buffer, size_t *lenp, loff_t *ppos)
2697{
Alexey Dobriyan8d65af72009-09-23 15:57:19 -07002698 return do_proc_dointvec(table,write,buffer,lenp,ppos,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002699 do_proc_dointvec_jiffies_conv,NULL);
2700}
2701
2702/**
2703 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2704 * @table: the sysctl table
2705 * @write: %TRUE if this is a write to the sysctl file
Linus Torvalds1da177e2005-04-16 15:20:36 -07002706 * @buffer: the user buffer
2707 * @lenp: the size of the user buffer
Randy Dunlap1e5d5332005-11-07 01:01:06 -08002708 * @ppos: pointer to the file position
Linus Torvalds1da177e2005-04-16 15:20:36 -07002709 *
2710 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2711 * values from/to the user buffer, treated as an ASCII string.
2712 * The values read are assumed to be in 1/USER_HZ seconds, and
2713 * are converted into jiffies.
2714 *
2715 * Returns 0 on success.
2716 */
Alexey Dobriyan8d65af72009-09-23 15:57:19 -07002717int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002718 void __user *buffer, size_t *lenp, loff_t *ppos)
2719{
Alexey Dobriyan8d65af72009-09-23 15:57:19 -07002720 return do_proc_dointvec(table,write,buffer,lenp,ppos,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002721 do_proc_dointvec_userhz_jiffies_conv,NULL);
2722}
2723
2724/**
2725 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2726 * @table: the sysctl table
2727 * @write: %TRUE if this is a write to the sysctl file
Linus Torvalds1da177e2005-04-16 15:20:36 -07002728 * @buffer: the user buffer
2729 * @lenp: the size of the user buffer
Martin Waitz67be2dd2005-05-01 08:59:26 -07002730 * @ppos: file position
2731 * @ppos: the current position in the file
Linus Torvalds1da177e2005-04-16 15:20:36 -07002732 *
2733 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2734 * values from/to the user buffer, treated as an ASCII string.
2735 * The values read are assumed to be in 1/1000 seconds, and
2736 * are converted into jiffies.
2737 *
2738 * Returns 0 on success.
2739 */
Alexey Dobriyan8d65af72009-09-23 15:57:19 -07002740int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002741 void __user *buffer, size_t *lenp, loff_t *ppos)
2742{
Alexey Dobriyan8d65af72009-09-23 15:57:19 -07002743 return do_proc_dointvec(table, write, buffer, lenp, ppos,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002744 do_proc_dointvec_ms_jiffies_conv, NULL);
2745}
2746
Alexey Dobriyan8d65af72009-09-23 15:57:19 -07002747static int proc_do_cad_pid(struct ctl_table *table, int write,
Cedric Le Goater9ec52092006-10-02 02:19:00 -07002748 void __user *buffer, size_t *lenp, loff_t *ppos)
2749{
2750 struct pid *new_pid;
2751 pid_t tmp;
2752 int r;
2753
Pavel Emelyanov6c5f3e72008-02-08 04:19:20 -08002754 tmp = pid_vnr(cad_pid);
Cedric Le Goater9ec52092006-10-02 02:19:00 -07002755
Alexey Dobriyan8d65af72009-09-23 15:57:19 -07002756 r = __do_proc_dointvec(&tmp, table, write, buffer,
Cedric Le Goater9ec52092006-10-02 02:19:00 -07002757 lenp, ppos, NULL, NULL);
2758 if (r || !write)
2759 return r;
2760
2761 new_pid = find_get_pid(tmp);
2762 if (!new_pid)
2763 return -ESRCH;
2764
2765 put_pid(xchg(&cad_pid, new_pid));
2766 return 0;
2767}
2768
Octavian Purdila9f977fb2010-05-05 00:26:55 +00002769/**
2770 * proc_do_large_bitmap - read/write from/to a large bitmap
2771 * @table: the sysctl table
2772 * @write: %TRUE if this is a write to the sysctl file
2773 * @buffer: the user buffer
2774 * @lenp: the size of the user buffer
2775 * @ppos: file position
2776 *
2777 * The bitmap is stored at table->data and the bitmap length (in bits)
2778 * in table->maxlen.
2779 *
2780 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2781 * large bitmaps may be represented in a compact manner. Writing into
2782 * the file will clear the bitmap then update it with the given input.
2783 *
2784 * Returns 0 on success.
2785 */
2786int proc_do_large_bitmap(struct ctl_table *table, int write,
2787 void __user *buffer, size_t *lenp, loff_t *ppos)
2788{
2789 int err = 0;
2790 bool first = 1;
2791 size_t left = *lenp;
2792 unsigned long bitmap_len = table->maxlen;
2793 unsigned long *bitmap = (unsigned long *) table->data;
2794 unsigned long *tmp_bitmap = NULL;
2795 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2796
2797 if (!bitmap_len || !left || (*ppos && !write)) {
2798 *lenp = 0;
2799 return 0;
2800 }
2801
2802 if (write) {
2803 unsigned long page = 0;
2804 char *kbuf;
2805
2806 if (left > PAGE_SIZE - 1)
2807 left = PAGE_SIZE - 1;
2808
2809 page = __get_free_page(GFP_TEMPORARY);
2810 kbuf = (char *) page;
2811 if (!kbuf)
2812 return -ENOMEM;
2813 if (copy_from_user(kbuf, buffer, left)) {
2814 free_page(page);
2815 return -EFAULT;
2816 }
2817 kbuf[left] = 0;
2818
2819 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
2820 GFP_KERNEL);
2821 if (!tmp_bitmap) {
2822 free_page(page);
2823 return -ENOMEM;
2824 }
2825 proc_skip_char(&kbuf, &left, '\n');
2826 while (!err && left) {
2827 unsigned long val_a, val_b;
2828 bool neg;
2829
2830 err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a,
2831 sizeof(tr_a), &c);
2832 if (err)
2833 break;
2834 if (val_a >= bitmap_len || neg) {
2835 err = -EINVAL;
2836 break;
2837 }
2838
2839 val_b = val_a;
2840 if (left) {
2841 kbuf++;
2842 left--;
2843 }
2844
2845 if (c == '-') {
2846 err = proc_get_long(&kbuf, &left, &val_b,
2847 &neg, tr_b, sizeof(tr_b),
2848 &c);
2849 if (err)
2850 break;
2851 if (val_b >= bitmap_len || neg ||
2852 val_a > val_b) {
2853 err = -EINVAL;
2854 break;
2855 }
2856 if (left) {
2857 kbuf++;
2858 left--;
2859 }
2860 }
2861
2862 while (val_a <= val_b)
2863 set_bit(val_a++, tmp_bitmap);
2864
2865 first = 0;
2866 proc_skip_char(&kbuf, &left, '\n');
2867 }
2868 free_page(page);
2869 } else {
2870 unsigned long bit_a, bit_b = 0;
2871
2872 while (left) {
2873 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
2874 if (bit_a >= bitmap_len)
2875 break;
2876 bit_b = find_next_zero_bit(bitmap, bitmap_len,
2877 bit_a + 1) - 1;
2878
2879 if (!first) {
2880 err = proc_put_char(&buffer, &left, ',');
2881 if (err)
2882 break;
2883 }
2884 err = proc_put_long(&buffer, &left, bit_a, false);
2885 if (err)
2886 break;
2887 if (bit_a != bit_b) {
2888 err = proc_put_char(&buffer, &left, '-');
2889 if (err)
2890 break;
2891 err = proc_put_long(&buffer, &left, bit_b, false);
2892 if (err)
2893 break;
2894 }
2895
2896 first = 0; bit_b++;
2897 }
2898 if (!err)
2899 err = proc_put_char(&buffer, &left, '\n');
2900 }
2901
2902 if (!err) {
2903 if (write) {
2904 if (*ppos)
2905 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
2906 else
2907 memcpy(bitmap, tmp_bitmap,
2908 BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long));
2909 }
2910 kfree(tmp_bitmap);
2911 *lenp -= left;
2912 *ppos += *lenp;
2913 return 0;
2914 } else {
2915 kfree(tmp_bitmap);
2916 return err;
2917 }
2918}
2919
Jovi Zhang55610502011-01-12 17:00:45 -08002920#else /* CONFIG_PROC_SYSCTL */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002921
Alexey Dobriyan8d65af72009-09-23 15:57:19 -07002922int proc_dostring(struct ctl_table *table, int write,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002923 void __user *buffer, size_t *lenp, loff_t *ppos)
2924{
2925 return -ENOSYS;
2926}
2927
Alexey Dobriyan8d65af72009-09-23 15:57:19 -07002928int proc_dointvec(struct ctl_table *table, int write,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002929 void __user *buffer, size_t *lenp, loff_t *ppos)
2930{
2931 return -ENOSYS;
2932}
2933
Alexey Dobriyan8d65af72009-09-23 15:57:19 -07002934int proc_dointvec_minmax(struct ctl_table *table, int write,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002935 void __user *buffer, size_t *lenp, loff_t *ppos)
2936{
2937 return -ENOSYS;
2938}
2939
Alexey Dobriyan8d65af72009-09-23 15:57:19 -07002940int proc_dointvec_jiffies(struct ctl_table *table, int write,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002941 void __user *buffer, size_t *lenp, loff_t *ppos)
2942{
2943 return -ENOSYS;
2944}
2945
Alexey Dobriyan8d65af72009-09-23 15:57:19 -07002946int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002947 void __user *buffer, size_t *lenp, loff_t *ppos)
2948{
2949 return -ENOSYS;
2950}
2951
Alexey Dobriyan8d65af72009-09-23 15:57:19 -07002952int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002953 void __user *buffer, size_t *lenp, loff_t *ppos)
2954{
2955 return -ENOSYS;
2956}
2957
Alexey Dobriyan8d65af72009-09-23 15:57:19 -07002958int proc_doulongvec_minmax(struct ctl_table *table, int write,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002959 void __user *buffer, size_t *lenp, loff_t *ppos)
2960{
2961 return -ENOSYS;
2962}
2963
Eric W. Biedermand8217f02007-10-18 03:05:22 -07002964int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002965 void __user *buffer,
2966 size_t *lenp, loff_t *ppos)
2967{
2968 return -ENOSYS;
2969}
2970
2971
Jovi Zhang55610502011-01-12 17:00:45 -08002972#endif /* CONFIG_PROC_SYSCTL */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002973
Linus Torvalds1da177e2005-04-16 15:20:36 -07002974/*
2975 * No sense putting this after each symbol definition, twice,
2976 * exception granted :-)
2977 */
2978EXPORT_SYMBOL(proc_dointvec);
2979EXPORT_SYMBOL(proc_dointvec_jiffies);
2980EXPORT_SYMBOL(proc_dointvec_minmax);
2981EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2982EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2983EXPORT_SYMBOL(proc_dostring);
2984EXPORT_SYMBOL(proc_doulongvec_minmax);
2985EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
2986EXPORT_SYMBOL(register_sysctl_table);
Eric W. Biederman29e796f2007-11-30 23:50:18 +11002987EXPORT_SYMBOL(register_sysctl_paths);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002988EXPORT_SYMBOL(unregister_sysctl_table);