blob: 997080f00e0bcbfca3669af93a97eb5951c17811 [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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070027#include <linux/proc_fs.h>
Andrew Morgan72c2d582007-10-18 03:05:59 -070028#include <linux/security.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070029#include <linux/ctype.h>
Vegard Nossumdfec0722008-04-04 00:51:41 +020030#include <linux/kmemcheck.h>
Adrian Bunk62239ac2007-07-17 04:03:45 -070031#include <linux/fs.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070032#include <linux/init.h>
33#include <linux/kernel.h>
Kay Sievers0296b222005-11-11 05:33:52 +010034#include <linux/kobject.h>
Arnaldo Carvalho de Melo20380732005-08-16 02:18:02 -030035#include <linux/net.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070036#include <linux/sysrq.h>
37#include <linux/highuid.h>
38#include <linux/writeback.h>
Ingo Molnar3fff4c42009-09-22 16:18:09 +020039#include <linux/ratelimit.h>
Mel Gorman76ab0f52010-05-24 14:32:28 -070040#include <linux/compaction.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070041#include <linux/hugetlb.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070042#include <linux/initrd.h>
David Howells0b77f5b2008-04-29 01:01:32 -070043#include <linux/key.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070044#include <linux/times.h>
45#include <linux/limits.h>
46#include <linux/dcache.h>
47#include <linux/syscalls.h>
Adrian Bunkc748e132008-07-23 21:27:03 -070048#include <linux/vmstat.h>
Pavel Machekc255d842006-02-20 18:27:58 -080049#include <linux/nfs_fs.h>
50#include <linux/acpi.h>
Jeremy Fitzhardinge10a0a8d2007-07-17 18:37:02 -070051#include <linux/reboot.h>
Steven Rostedtb0fc4942008-05-12 21:20:43 +020052#include <linux/ftrace.h>
David Howells12e22c52009-04-03 16:42:35 +010053#include <linux/slow-work.h>
Ingo Molnarcdd6c482009-09-21 12:02:48 +020054#include <linux/perf_event.h>
Masami Hiramatsub2be84d2010-02-25 08:34:15 -050055#include <linux/kprobes.h>
Jens Axboeb492e952010-05-19 21:03:16 +020056#include <linux/pipe_fs_i.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070057
58#include <asm/uaccess.h>
59#include <asm/processor.h>
60
Andi Kleen29cbc782006-09-30 01:47:55 +020061#ifdef CONFIG_X86
62#include <asm/nmi.h>
Chuck Ebbert0741f4d2006-12-07 02:14:11 +010063#include <asm/stacktrace.h>
Ingo Molnar6e7c4022008-01-30 13:30:05 +010064#include <asm/io.h>
Andi Kleen29cbc782006-09-30 01:47:55 +020065#endif
Dave Youngc55b7c32010-03-10 15:24:08 -080066#ifdef CONFIG_BSD_PROCESS_ACCT
67#include <linux/acct.h>
68#endif
Dave Young4f0e0562010-03-10 15:24:09 -080069#ifdef CONFIG_RT_MUTEXES
70#include <linux/rtmutex.h>
71#endif
Dave Young2edf5e42010-03-10 15:24:10 -080072#if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
73#include <linux/lockdep.h>
74#endif
Dave Young15485a42010-03-10 15:24:07 -080075#ifdef CONFIG_CHR_DEV_SG
76#include <scsi/sg.h>
77#endif
Andi Kleen29cbc782006-09-30 01:47:55 +020078
Eric W. Biederman7058cb02007-10-18 03:05:58 -070079
Linus Torvalds1da177e2005-04-16 15:20:36 -070080#if defined(CONFIG_SYSCTL)
81
82/* External variables not in a header file. */
Linus Torvalds1da177e2005-04-16 15:20:36 -070083extern int sysctl_overcommit_memory;
84extern int sysctl_overcommit_ratio;
KAMEZAWA Hiroyukifadd8fb2006-06-23 02:03:13 -070085extern int sysctl_panic_on_oom;
David Rientjesfe071d72007-10-16 23:25:56 -070086extern int sysctl_oom_kill_allocating_task;
David Rientjesfef1bdd2008-02-07 00:14:07 -080087extern int sysctl_oom_dump_tasks;
Linus Torvalds1da177e2005-04-16 15:20:36 -070088extern int max_threads;
Linus Torvalds1da177e2005-04-16 15:20:36 -070089extern int core_uses_pid;
Alan Coxd6e71142005-06-23 00:09:43 -070090extern int suid_dumpable;
Linus Torvalds1da177e2005-04-16 15:20:36 -070091extern char core_pattern[];
Neil Hormana2939802009-09-23 15:56:56 -070092extern unsigned int core_pipe_limit;
Linus Torvalds1da177e2005-04-16 15:20:36 -070093extern int pid_max;
94extern int min_free_kbytes;
Linus Torvalds1da177e2005-04-16 15:20:36 -070095extern int pid_max_min, pid_max_max;
Andrew Morton9d0243b2006-01-08 01:00:39 -080096extern int sysctl_drop_caches;
Rohit Seth8ad4b1f2006-01-08 01:00:40 -080097extern int percpu_pagelist_fraction;
Andi Kleenbebfa102006-06-26 13:56:52 +020098extern int compat_log;
Arjan van de Ven97455122008-01-25 21:08:34 +010099extern int latencytop_enabled;
Al Viroeceea0b2008-05-10 10:08:32 -0400100extern int sysctl_nr_open_min, sysctl_nr_open_max;
Paul Mundtdd8632a2009-01-08 12:04:47 +0000101#ifndef CONFIG_MMU
102extern int sysctl_nr_trim_pages;
103#endif
Jens Axboecb684b52009-09-15 21:53:11 +0200104#ifdef CONFIG_BLOCK
Jens Axboe5e605b62009-08-05 09:07:21 +0200105extern int blk_iopoll_enabled;
Jens Axboecb684b52009-09-15 21:53:11 +0200106#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107
Ravikiran G Thirumalaic4f3b632007-10-16 23:26:09 -0700108/* Constants used for minimum and maximum */
Bron Gondwana195cf452008-02-04 22:29:20 -0800109#ifdef CONFIG_DETECT_SOFTLOCKUP
Ravikiran G Thirumalaic4f3b632007-10-16 23:26:09 -0700110static int sixty = 60;
Dimitri Sivanich9383d962008-05-12 21:21:14 +0200111static int neg_one = -1;
Ravikiran G Thirumalaic4f3b632007-10-16 23:26:09 -0700112#endif
113
Ravikiran G Thirumalaic4f3b632007-10-16 23:26:09 -0700114static int zero;
Linus Torvaldscd5f9a42009-04-06 13:38:46 -0700115static int __maybe_unused one = 1;
116static int __maybe_unused two = 2;
Sven Wegenerfc3501d2009-02-11 13:04:23 -0800117static unsigned long one_ul = 1;
Ravikiran G Thirumalaic4f3b632007-10-16 23:26:09 -0700118static int one_hundred = 100;
Dave Youngaf913222009-09-22 16:43:33 -0700119#ifdef CONFIG_PRINTK
120static int ten_thousand = 10000;
121#endif
Ravikiran G Thirumalaic4f3b632007-10-16 23:26:09 -0700122
Andrea Righi9e4a5bd2009-04-30 15:08:57 -0700123/* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
124static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
125
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126/* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
127static int maxolduid = 65535;
128static int minolduid;
Rohit Seth8ad4b1f2006-01-08 01:00:40 -0800129static int min_percpu_pagelist_fract = 8;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130
131static int ngroups_max = NGROUPS_MAX;
132
David S. Miller72c57ed2008-09-11 23:29:54 -0700133#ifdef CONFIG_SPARC
David S. Miller17f04fb2008-09-11 23:33:53 -0700134#include <asm/system.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135#endif
136
David S. Miller08714202008-11-16 23:49:24 -0800137#ifdef CONFIG_SPARC64
138extern int sysctl_tsb_ratio;
139#endif
140
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141#ifdef __hppa__
142extern int pwrsw_enabled;
143extern int unaligned_enabled;
144#endif
145
Martin Schwidefsky347a8dc2006-01-06 00:19:28 -0800146#ifdef CONFIG_S390
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147#ifdef CONFIG_MATHEMU
148extern int sysctl_ieee_emulation_warnings;
149#endif
150extern int sysctl_userprocess_debug;
Martin Schwidefsky951f22d2005-07-27 11:44:57 -0700151extern int spin_retry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152#endif
153
Jes Sorensend2b176e2006-02-28 09:42:23 -0800154#ifdef CONFIG_IA64
155extern int no_unaligned_warning;
Doug Chapman88fc2412009-01-15 10:38:56 -0800156extern int unaligned_dump_stack;
Jes Sorensend2b176e2006-02-28 09:42:23 -0800157#endif
158
Ingo Molnar3fff4c42009-09-22 16:18:09 +0200159extern struct ratelimit_state printk_ratelimit_state;
160
Randy Dunlapd6f8ff72006-10-19 23:28:34 -0700161#ifdef CONFIG_PROC_SYSCTL
Alexey Dobriyan8d65af72009-09-23 15:57:19 -0700162static int proc_do_cad_pid(struct ctl_table *table, int write,
Cedric Le Goater9ec52092006-10-02 02:19:00 -0700163 void __user *buffer, size_t *lenp, loff_t *ppos);
Alexey Dobriyan8d65af72009-09-23 15:57:19 -0700164static int proc_taint(struct ctl_table *table, int write,
Theodore Ts'o34f5a392007-02-10 01:45:24 -0800165 void __user *buffer, size_t *lenp, loff_t *ppos);
Randy Dunlapd6f8ff72006-10-19 23:28:34 -0700166#endif
Cedric Le Goater9ec52092006-10-02 02:19:00 -0700167
Dmitry Torokhov97f5f0c2010-03-21 22:31:26 -0700168#ifdef CONFIG_MAGIC_SYSRQ
169static int __sysrq_enabled; /* Note: sysrq code ises it's own private copy */
170
171static int sysrq_sysctl_handler(ctl_table *table, int write,
172 void __user *buffer, size_t *lenp,
173 loff_t *ppos)
174{
175 int error;
176
177 error = proc_dointvec(table, write, buffer, lenp, ppos);
178 if (error)
179 return error;
180
181 if (write)
182 sysrq_toggle_support(__sysrq_enabled);
183
184 return 0;
185}
186
187#endif
188
Eric W. Biedermand8217f02007-10-18 03:05:22 -0700189static struct ctl_table root_table[];
Eric W. Biedermane51b6ba2007-11-30 23:54:00 +1100190static struct ctl_table_root sysctl_table_root;
191static struct ctl_table_header root_table_header = {
Al Virob380b0d2008-09-04 17:05:57 +0100192 .count = 1,
Eric W. Biedermane51b6ba2007-11-30 23:54:00 +1100193 .ctl_table = root_table,
Al Viro73455092008-07-14 21:22:20 -0400194 .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.default_set.list),
Eric W. Biedermane51b6ba2007-11-30 23:54:00 +1100195 .root = &sysctl_table_root,
Al Viro73455092008-07-14 21:22:20 -0400196 .set = &sysctl_table_root.default_set,
Eric W. Biedermane51b6ba2007-11-30 23:54:00 +1100197};
198static struct ctl_table_root sysctl_table_root = {
199 .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list),
Al Viro73455092008-07-14 21:22:20 -0400200 .default_set.list = LIST_HEAD_INIT(root_table_header.ctl_entry),
Eric W. Biedermane51b6ba2007-11-30 23:54:00 +1100201};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202
Eric W. Biedermand8217f02007-10-18 03:05:22 -0700203static struct ctl_table kern_table[];
204static struct ctl_table vm_table[];
205static struct ctl_table fs_table[];
206static struct ctl_table debug_table[];
207static struct ctl_table dev_table[];
208extern struct ctl_table random_table[];
Amy Griffis2d9048e2006-06-01 13:10:59 -0700209#ifdef CONFIG_INOTIFY_USER
Eric W. Biedermand8217f02007-10-18 03:05:22 -0700210extern struct ctl_table inotify_table[];
Robert Love0399cb02005-07-13 12:38:18 -0400211#endif
Davide Libenzi7ef99642008-12-01 13:13:55 -0800212#ifdef CONFIG_EPOLL
213extern struct ctl_table epoll_table[];
214#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215
216#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
217int sysctl_legacy_va_layout;
218#endif
219
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220/* The default sysctl tables: */
221
Eric W. Biedermand8217f02007-10-18 03:05:22 -0700222static struct ctl_table root_table[] = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224 .procname = "kernel",
225 .mode = 0555,
226 .child = kern_table,
227 },
228 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229 .procname = "vm",
230 .mode = 0555,
231 .child = vm_table,
232 },
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234 .procname = "fs",
235 .mode = 0555,
236 .child = fs_table,
237 },
238 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239 .procname = "debug",
240 .mode = 0555,
241 .child = debug_table,
242 },
243 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244 .procname = "dev",
245 .mode = 0555,
246 .child = dev_table,
247 },
Andrew Morton2be7fe02007-07-15 23:41:21 -0700248/*
249 * NOTE: do not add new entries to this table unless you have read
250 * Documentation/sysctl/ctl_unnumbered.txt
251 */
Eric W. Biederman6fce56e2009-04-03 02:30:53 -0700252 { }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253};
254
Ingo Molnar77e54a12007-07-09 18:52:00 +0200255#ifdef CONFIG_SCHED_DEBUG
Eric Dumazet73c4efd2007-12-18 15:21:13 +0100256static int min_sched_granularity_ns = 100000; /* 100 usecs */
257static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
258static int min_wakeup_granularity_ns; /* 0 usecs */
259static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
Christian Ehrhardt1983a922009-11-30 12:16:47 +0100260static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
261static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
Christian Ehrhardtacb4a842009-11-30 12:16:48 +0100262static int min_sched_shares_ratelimit = 100000; /* 100 usec */
263static int max_sched_shares_ratelimit = NSEC_PER_SEC; /* 1 second */
Ingo Molnar77e54a12007-07-09 18:52:00 +0200264#endif
265
Mel Gorman5e771902010-05-24 14:32:31 -0700266#ifdef CONFIG_COMPACTION
267static int min_extfrag_threshold;
268static int max_extfrag_threshold = 1000;
269#endif
270
Eric W. Biedermand8217f02007-10-18 03:05:22 -0700271static struct ctl_table kern_table[] = {
Mike Galbraith2bba22c2009-09-09 15:41:37 +0200272 {
Mike Galbraith2bba22c2009-09-09 15:41:37 +0200273 .procname = "sched_child_runs_first",
274 .data = &sysctl_sched_child_runs_first,
275 .maxlen = sizeof(unsigned int),
276 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800277 .proc_handler = proc_dointvec,
Mike Galbraith2bba22c2009-09-09 15:41:37 +0200278 },
Ingo Molnar77e54a12007-07-09 18:52:00 +0200279#ifdef CONFIG_SCHED_DEBUG
280 {
Peter Zijlstrab2be5e92007-11-09 22:39:37 +0100281 .procname = "sched_min_granularity_ns",
282 .data = &sysctl_sched_min_granularity,
Ingo Molnar77e54a12007-07-09 18:52:00 +0200283 .maxlen = sizeof(unsigned int),
284 .mode = 0644,
Linus Torvalds702a7c72009-12-12 11:34:10 -0800285 .proc_handler = sched_proc_update_handler,
Peter Zijlstrab2be5e92007-11-09 22:39:37 +0100286 .extra1 = &min_sched_granularity_ns,
287 .extra2 = &max_sched_granularity_ns,
Ingo Molnar77e54a12007-07-09 18:52:00 +0200288 },
289 {
Peter Zijlstra21805082007-08-25 18:41:53 +0200290 .procname = "sched_latency_ns",
291 .data = &sysctl_sched_latency,
292 .maxlen = sizeof(unsigned int),
293 .mode = 0644,
Linus Torvalds702a7c72009-12-12 11:34:10 -0800294 .proc_handler = sched_proc_update_handler,
Peter Zijlstra21805082007-08-25 18:41:53 +0200295 .extra1 = &min_sched_granularity_ns,
296 .extra2 = &max_sched_granularity_ns,
297 },
298 {
Ingo Molnar77e54a12007-07-09 18:52:00 +0200299 .procname = "sched_wakeup_granularity_ns",
300 .data = &sysctl_sched_wakeup_granularity,
301 .maxlen = sizeof(unsigned int),
302 .mode = 0644,
Linus Torvalds702a7c72009-12-12 11:34:10 -0800303 .proc_handler = sched_proc_update_handler,
Ingo Molnar77e54a12007-07-09 18:52:00 +0200304 .extra1 = &min_wakeup_granularity_ns,
305 .extra2 = &max_wakeup_granularity_ns,
306 },
307 {
Peter Zijlstra2398f2c2008-06-27 13:41:35 +0200308 .procname = "sched_shares_ratelimit",
309 .data = &sysctl_sched_shares_ratelimit,
310 .maxlen = sizeof(unsigned int),
311 .mode = 0644,
Linus Torvalds702a7c72009-12-12 11:34:10 -0800312 .proc_handler = sched_proc_update_handler,
Christian Ehrhardtacb4a842009-11-30 12:16:48 +0100313 .extra1 = &min_sched_shares_ratelimit,
314 .extra2 = &max_sched_shares_ratelimit,
Peter Zijlstra2398f2c2008-06-27 13:41:35 +0200315 },
316 {
Christian Ehrhardt1983a922009-11-30 12:16:47 +0100317 .procname = "sched_tunable_scaling",
318 .data = &sysctl_sched_tunable_scaling,
319 .maxlen = sizeof(enum sched_tunable_scaling),
320 .mode = 0644,
Linus Torvalds702a7c72009-12-12 11:34:10 -0800321 .proc_handler = sched_proc_update_handler,
Christian Ehrhardt1983a922009-11-30 12:16:47 +0100322 .extra1 = &min_sched_tunable_scaling,
323 .extra2 = &max_sched_tunable_scaling,
Peter Zijlstra2398f2c2008-06-27 13:41:35 +0200324 },
325 {
Peter Zijlstraffda12a2008-10-17 19:27:02 +0200326 .procname = "sched_shares_thresh",
327 .data = &sysctl_sched_shares_thresh,
328 .maxlen = sizeof(unsigned int),
329 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800330 .proc_handler = proc_dointvec_minmax,
Peter Zijlstraffda12a2008-10-17 19:27:02 +0200331 .extra1 = &zero,
332 },
333 {
Ingo Molnarda84d962007-10-15 17:00:18 +0200334 .procname = "sched_migration_cost",
335 .data = &sysctl_sched_migration_cost,
336 .maxlen = sizeof(unsigned int),
337 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800338 .proc_handler = proc_dointvec,
Ingo Molnarda84d962007-10-15 17:00:18 +0200339 },
Peter Zijlstrab82d9fd2007-11-09 22:39:39 +0100340 {
Peter Zijlstrab82d9fd2007-11-09 22:39:39 +0100341 .procname = "sched_nr_migrate",
342 .data = &sysctl_sched_nr_migrate,
343 .maxlen = sizeof(unsigned int),
Peter Zijlstrafa85ae22008-01-25 21:08:29 +0100344 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800345 .proc_handler = proc_dointvec,
Peter Zijlstrafa85ae22008-01-25 21:08:29 +0100346 },
Arun R Bharadwajcd1bb942009-04-16 12:15:34 +0530347 {
Peter Zijlstrae9e92502009-09-01 10:34:37 +0200348 .procname = "sched_time_avg",
349 .data = &sysctl_sched_time_avg,
350 .maxlen = sizeof(unsigned int),
351 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800352 .proc_handler = proc_dointvec,
Peter Zijlstrae9e92502009-09-01 10:34:37 +0200353 },
354 {
Arun R Bharadwajcd1bb942009-04-16 12:15:34 +0530355 .procname = "timer_migration",
356 .data = &sysctl_timer_migration,
357 .maxlen = sizeof(unsigned int),
358 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800359 .proc_handler = proc_dointvec_minmax,
Arun R Bharadwajbfdb4d92009-06-23 10:00:58 +0530360 .extra1 = &zero,
361 .extra2 = &one,
Arun R Bharadwajcd1bb942009-04-16 12:15:34 +0530362 },
Peter Zijlstra1fc84aa2007-08-25 18:41:52 +0200363#endif
Ingo Molnar1799e352007-09-19 23:34:46 +0200364 {
Peter Zijlstra9f0c1e52008-02-13 15:45:39 +0100365 .procname = "sched_rt_period_us",
366 .data = &sysctl_sched_rt_period,
367 .maxlen = sizeof(unsigned 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 },
371 {
Peter Zijlstra9f0c1e52008-02-13 15:45:39 +0100372 .procname = "sched_rt_runtime_us",
373 .data = &sysctl_sched_rt_runtime,
374 .maxlen = sizeof(int),
375 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800376 .proc_handler = sched_rt_handler,
Peter Zijlstra9f0c1e52008-02-13 15:45:39 +0100377 },
378 {
Ingo Molnar1799e352007-09-19 23:34:46 +0200379 .procname = "sched_compat_yield",
380 .data = &sysctl_sched_compat_yield,
381 .maxlen = sizeof(unsigned int),
382 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800383 .proc_handler = proc_dointvec,
Ingo Molnar1799e352007-09-19 23:34:46 +0200384 },
Peter Zijlstraf20786f2007-07-19 01:48:56 -0700385#ifdef CONFIG_PROVE_LOCKING
386 {
Peter Zijlstraf20786f2007-07-19 01:48:56 -0700387 .procname = "prove_locking",
388 .data = &prove_locking,
389 .maxlen = sizeof(int),
390 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800391 .proc_handler = proc_dointvec,
Peter Zijlstraf20786f2007-07-19 01:48:56 -0700392 },
393#endif
394#ifdef CONFIG_LOCK_STAT
395 {
Peter Zijlstraf20786f2007-07-19 01:48:56 -0700396 .procname = "lock_stat",
397 .data = &lock_stat,
398 .maxlen = sizeof(int),
399 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800400 .proc_handler = proc_dointvec,
Peter Zijlstraf20786f2007-07-19 01:48:56 -0700401 },
402#endif
Ingo Molnar77e54a12007-07-09 18:52:00 +0200403 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700404 .procname = "panic",
405 .data = &panic_timeout,
406 .maxlen = sizeof(int),
407 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800408 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409 },
410 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411 .procname = "core_uses_pid",
412 .data = &core_uses_pid,
413 .maxlen = sizeof(int),
414 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800415 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700416 },
417 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418 .procname = "core_pattern",
419 .data = core_pattern,
Dan Aloni71ce92f2007-05-16 22:11:16 -0700420 .maxlen = CORENAME_MAX_SIZE,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800422 .proc_handler = proc_dostring,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423 },
Neil Hormana2939802009-09-23 15:56:56 -0700424 {
Neil Hormana2939802009-09-23 15:56:56 -0700425 .procname = "core_pipe_limit",
426 .data = &core_pipe_limit,
427 .maxlen = sizeof(unsigned int),
428 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800429 .proc_handler = proc_dointvec,
Neil Hormana2939802009-09-23 15:56:56 -0700430 },
Theodore Ts'o34f5a392007-02-10 01:45:24 -0800431#ifdef CONFIG_PROC_SYSCTL
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700433 .procname = "tainted",
Andi Kleen25ddbb12008-10-15 22:01:41 -0700434 .maxlen = sizeof(long),
Theodore Ts'o34f5a392007-02-10 01:45:24 -0800435 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800436 .proc_handler = proc_taint,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437 },
Theodore Ts'o34f5a392007-02-10 01:45:24 -0800438#endif
Arjan van de Ven97455122008-01-25 21:08:34 +0100439#ifdef CONFIG_LATENCYTOP
440 {
441 .procname = "latencytop",
442 .data = &latencytop_enabled,
443 .maxlen = sizeof(int),
444 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800445 .proc_handler = proc_dointvec,
Arjan van de Ven97455122008-01-25 21:08:34 +0100446 },
447#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448#ifdef CONFIG_BLK_DEV_INITRD
449 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700450 .procname = "real-root-dev",
451 .data = &real_root_dev,
452 .maxlen = sizeof(int),
453 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800454 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700455 },
456#endif
Ingo Molnar45807a12007-07-15 23:40:10 -0700457 {
Ingo Molnar45807a12007-07-15 23:40:10 -0700458 .procname = "print-fatal-signals",
459 .data = &print_fatal_signals,
460 .maxlen = sizeof(int),
461 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800462 .proc_handler = proc_dointvec,
Ingo Molnar45807a12007-07-15 23:40:10 -0700463 },
David S. Miller72c57ed2008-09-11 23:29:54 -0700464#ifdef CONFIG_SPARC
Linus Torvalds1da177e2005-04-16 15:20:36 -0700465 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700466 .procname = "reboot-cmd",
467 .data = reboot_command,
468 .maxlen = 256,
469 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800470 .proc_handler = proc_dostring,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471 },
472 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700473 .procname = "stop-a",
474 .data = &stop_a_enabled,
475 .maxlen = sizeof (int),
476 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800477 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478 },
479 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700480 .procname = "scons-poweroff",
481 .data = &scons_pwroff,
482 .maxlen = sizeof (int),
483 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800484 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485 },
486#endif
David S. Miller08714202008-11-16 23:49:24 -0800487#ifdef CONFIG_SPARC64
488 {
David S. Miller08714202008-11-16 23:49:24 -0800489 .procname = "tsb-ratio",
490 .data = &sysctl_tsb_ratio,
491 .maxlen = sizeof (int),
492 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800493 .proc_handler = proc_dointvec,
David S. Miller08714202008-11-16 23:49:24 -0800494 },
495#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496#ifdef __hppa__
497 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700498 .procname = "soft-power",
499 .data = &pwrsw_enabled,
500 .maxlen = sizeof (int),
501 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800502 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700503 },
504 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700505 .procname = "unaligned-trap",
506 .data = &unaligned_enabled,
507 .maxlen = sizeof (int),
508 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800509 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700510 },
511#endif
512 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513 .procname = "ctrl-alt-del",
514 .data = &C_A_D,
515 .maxlen = sizeof(int),
516 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800517 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700518 },
Steven Rostedt606576c2008-10-06 19:06:12 -0400519#ifdef CONFIG_FUNCTION_TRACER
Steven Rostedtb0fc4942008-05-12 21:20:43 +0200520 {
Steven Rostedtb0fc4942008-05-12 21:20:43 +0200521 .procname = "ftrace_enabled",
522 .data = &ftrace_enabled,
523 .maxlen = sizeof(int),
524 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800525 .proc_handler = ftrace_enable_sysctl,
Steven Rostedtb0fc4942008-05-12 21:20:43 +0200526 },
527#endif
Steven Rostedtf38f1d22008-12-16 23:06:40 -0500528#ifdef CONFIG_STACK_TRACER
529 {
Steven Rostedtf38f1d22008-12-16 23:06:40 -0500530 .procname = "stack_tracer_enabled",
531 .data = &stack_tracer_enabled,
532 .maxlen = sizeof(int),
533 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800534 .proc_handler = stack_trace_sysctl,
Steven Rostedtf38f1d22008-12-16 23:06:40 -0500535 },
536#endif
Steven Rostedt944ac422008-10-23 19:26:08 -0400537#ifdef CONFIG_TRACING
538 {
Peter Zijlstra3299b4d2008-11-04 11:58:21 +0100539 .procname = "ftrace_dump_on_oops",
Steven Rostedt944ac422008-10-23 19:26:08 -0400540 .data = &ftrace_dump_on_oops,
541 .maxlen = sizeof(int),
542 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800543 .proc_handler = proc_dointvec,
Steven Rostedt944ac422008-10-23 19:26:08 -0400544 },
545#endif
Johannes Berga1ef5ad2008-07-08 19:00:17 +0200546#ifdef CONFIG_MODULES
Linus Torvalds1da177e2005-04-16 15:20:36 -0700547 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700548 .procname = "modprobe",
549 .data = &modprobe_path,
550 .maxlen = KMOD_PATH_LEN,
551 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800552 .proc_handler = proc_dostring,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700553 },
Kees Cook3d433212009-04-02 15:49:29 -0700554 {
Kees Cook3d433212009-04-02 15:49:29 -0700555 .procname = "modules_disabled",
556 .data = &modules_disabled,
557 .maxlen = sizeof(int),
558 .mode = 0644,
559 /* only handle a transition from default "0" to "1" */
Eric W. Biederman6d456112009-11-16 03:11:48 -0800560 .proc_handler = proc_dointvec_minmax,
Kees Cook3d433212009-04-02 15:49:29 -0700561 .extra1 = &one,
562 .extra2 = &one,
563 },
Linus Torvalds1da177e2005-04-16 15:20:36 -0700564#endif
Andrew Morton57ae2502006-06-23 02:05:47 -0700565#if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700566 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700567 .procname = "hotplug",
Kay Sievers312c0042005-11-16 09:00:00 +0100568 .data = &uevent_helper,
569 .maxlen = UEVENT_HELPER_PATH_LEN,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700570 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800571 .proc_handler = proc_dostring,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700572 },
573#endif
574#ifdef CONFIG_CHR_DEV_SG
575 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700576 .procname = "sg-big-buff",
577 .data = &sg_big_buff,
578 .maxlen = sizeof (int),
579 .mode = 0444,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800580 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700581 },
582#endif
583#ifdef CONFIG_BSD_PROCESS_ACCT
584 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700585 .procname = "acct",
586 .data = &acct_parm,
587 .maxlen = 3*sizeof(int),
588 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800589 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700590 },
591#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700592#ifdef CONFIG_MAGIC_SYSRQ
593 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700594 .procname = "sysrq",
Ingo Molnar5d6f6472006-12-13 00:34:36 -0800595 .data = &__sysrq_enabled,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700596 .maxlen = sizeof (int),
597 .mode = 0644,
Dmitry Torokhov97f5f0c2010-03-21 22:31:26 -0700598 .proc_handler = sysrq_sysctl_handler,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700599 },
600#endif
Randy Dunlapd6f8ff72006-10-19 23:28:34 -0700601#ifdef CONFIG_PROC_SYSCTL
Linus Torvalds1da177e2005-04-16 15:20:36 -0700602 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700603 .procname = "cad_pid",
Cedric Le Goater9ec52092006-10-02 02:19:00 -0700604 .data = NULL,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700605 .maxlen = sizeof (int),
606 .mode = 0600,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800607 .proc_handler = proc_do_cad_pid,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700608 },
Randy Dunlapd6f8ff72006-10-19 23:28:34 -0700609#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700610 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700611 .procname = "threads-max",
612 .data = &max_threads,
613 .maxlen = sizeof(int),
614 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800615 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700616 },
617 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700618 .procname = "random",
619 .mode = 0555,
620 .child = random_table,
621 },
Linus Torvalds1da177e2005-04-16 15:20:36 -0700622 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700623 .procname = "overflowuid",
624 .data = &overflowuid,
625 .maxlen = sizeof(int),
626 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800627 .proc_handler = proc_dointvec_minmax,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700628 .extra1 = &minolduid,
629 .extra2 = &maxolduid,
630 },
631 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700632 .procname = "overflowgid",
633 .data = &overflowgid,
634 .maxlen = sizeof(int),
635 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800636 .proc_handler = proc_dointvec_minmax,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700637 .extra1 = &minolduid,
638 .extra2 = &maxolduid,
639 },
Martin Schwidefsky347a8dc2006-01-06 00:19:28 -0800640#ifdef CONFIG_S390
Linus Torvalds1da177e2005-04-16 15:20:36 -0700641#ifdef CONFIG_MATHEMU
642 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700643 .procname = "ieee_emulation_warnings",
644 .data = &sysctl_ieee_emulation_warnings,
645 .maxlen = sizeof(int),
646 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800647 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700648 },
649#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700650 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700651 .procname = "userprocess_debug",
Heiko Carstensab3c68e2010-05-17 10:00:21 +0200652 .data = &show_unhandled_signals,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700653 .maxlen = sizeof(int),
654 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800655 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700656 },
657#endif
658 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700659 .procname = "pid_max",
660 .data = &pid_max,
661 .maxlen = sizeof (int),
662 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800663 .proc_handler = proc_dointvec_minmax,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700664 .extra1 = &pid_max_min,
665 .extra2 = &pid_max_max,
666 },
667 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700668 .procname = "panic_on_oops",
669 .data = &panic_on_oops,
670 .maxlen = sizeof(int),
671 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800672 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700673 },
Joe Perches7ef3d2f2008-02-08 04:21:25 -0800674#if defined CONFIG_PRINTK
675 {
Joe Perches7ef3d2f2008-02-08 04:21:25 -0800676 .procname = "printk",
677 .data = &console_loglevel,
678 .maxlen = 4*sizeof(int),
679 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800680 .proc_handler = proc_dointvec,
Joe Perches7ef3d2f2008-02-08 04:21:25 -0800681 },
Linus Torvalds1da177e2005-04-16 15:20:36 -0700682 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700683 .procname = "printk_ratelimit",
Dave Young717115e2008-07-25 01:45:58 -0700684 .data = &printk_ratelimit_state.interval,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700685 .maxlen = sizeof(int),
686 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800687 .proc_handler = proc_dointvec_jiffies,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700688 },
689 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700690 .procname = "printk_ratelimit_burst",
Dave Young717115e2008-07-25 01:45:58 -0700691 .data = &printk_ratelimit_state.burst,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700692 .maxlen = sizeof(int),
693 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800694 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700695 },
Dave Youngaf913222009-09-22 16:43:33 -0700696 {
Dave Youngaf913222009-09-22 16:43:33 -0700697 .procname = "printk_delay",
698 .data = &printk_delay_msec,
699 .maxlen = sizeof(int),
700 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800701 .proc_handler = proc_dointvec_minmax,
Dave Youngaf913222009-09-22 16:43:33 -0700702 .extra1 = &zero,
703 .extra2 = &ten_thousand,
704 },
Joe Perches7ef3d2f2008-02-08 04:21:25 -0800705#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700706 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700707 .procname = "ngroups_max",
708 .data = &ngroups_max,
709 .maxlen = sizeof (int),
710 .mode = 0444,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800711 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700712 },
713#if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
714 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700715 .procname = "unknown_nmi_panic",
716 .data = &unknown_nmi_panic,
717 .maxlen = sizeof (int),
718 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800719 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700720 },
Don Zickus407984f2006-09-26 10:52:27 +0200721 {
Don Zickus407984f2006-09-26 10:52:27 +0200722 .procname = "nmi_watchdog",
723 .data = &nmi_watchdog_enabled,
724 .maxlen = sizeof (int),
725 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800726 .proc_handler = proc_nmi_enabled,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700727 },
728#endif
729#if defined(CONFIG_X86)
730 {
Don Zickus8da5add2006-09-26 10:52:27 +0200731 .procname = "panic_on_unrecovered_nmi",
732 .data = &panic_on_unrecovered_nmi,
733 .maxlen = sizeof(int),
734 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800735 .proc_handler = proc_dointvec,
Don Zickus8da5add2006-09-26 10:52:27 +0200736 },
737 {
Kurt Garloff5211a242009-06-24 14:32:11 -0700738 .procname = "panic_on_io_nmi",
739 .data = &panic_on_io_nmi,
740 .maxlen = sizeof(int),
741 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800742 .proc_handler = proc_dointvec,
Kurt Garloff5211a242009-06-24 14:32:11 -0700743 },
744 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700745 .procname = "bootloader_type",
746 .data = &bootloader_type,
747 .maxlen = sizeof (int),
748 .mode = 0444,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800749 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700750 },
Chuck Ebbert0741f4d2006-12-07 02:14:11 +0100751 {
H. Peter Anvin50312962009-05-07 16:54:11 -0700752 .procname = "bootloader_version",
753 .data = &bootloader_version,
754 .maxlen = sizeof (int),
755 .mode = 0444,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800756 .proc_handler = proc_dointvec,
H. Peter Anvin50312962009-05-07 16:54:11 -0700757 },
758 {
Chuck Ebbert0741f4d2006-12-07 02:14:11 +0100759 .procname = "kstack_depth_to_print",
760 .data = &kstack_depth_to_print,
761 .maxlen = sizeof(int),
762 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800763 .proc_handler = proc_dointvec,
Chuck Ebbert0741f4d2006-12-07 02:14:11 +0100764 },
Ingo Molnar6e7c4022008-01-30 13:30:05 +0100765 {
Ingo Molnar6e7c4022008-01-30 13:30:05 +0100766 .procname = "io_delay_type",
767 .data = &io_delay_type,
768 .maxlen = sizeof(int),
769 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800770 .proc_handler = proc_dointvec,
Ingo Molnar6e7c4022008-01-30 13:30:05 +0100771 },
Linus Torvalds1da177e2005-04-16 15:20:36 -0700772#endif
Luke Yang7a9166e2006-02-20 18:28:07 -0800773#if defined(CONFIG_MMU)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700774 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700775 .procname = "randomize_va_space",
776 .data = &randomize_va_space,
777 .maxlen = sizeof(int),
778 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800779 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700780 },
Luke Yang7a9166e2006-02-20 18:28:07 -0800781#endif
Martin Schwidefsky0152fb32006-01-14 13:21:00 -0800782#if defined(CONFIG_S390) && defined(CONFIG_SMP)
Martin Schwidefsky951f22d2005-07-27 11:44:57 -0700783 {
Martin Schwidefsky951f22d2005-07-27 11:44:57 -0700784 .procname = "spin_retry",
785 .data = &spin_retry,
786 .maxlen = sizeof (int),
787 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800788 .proc_handler = proc_dointvec,
Martin Schwidefsky951f22d2005-07-27 11:44:57 -0700789 },
790#endif
Len Brown673d5b42007-07-28 03:33:16 -0400791#if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
Pavel Machekc255d842006-02-20 18:27:58 -0800792 {
Pavel Machekc255d842006-02-20 18:27:58 -0800793 .procname = "acpi_video_flags",
Pavel Machek77afcf72007-07-19 01:47:41 -0700794 .data = &acpi_realmode_flags,
Pavel Machekc255d842006-02-20 18:27:58 -0800795 .maxlen = sizeof (unsigned long),
796 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800797 .proc_handler = proc_doulongvec_minmax,
Pavel Machekc255d842006-02-20 18:27:58 -0800798 },
799#endif
Jes Sorensend2b176e2006-02-28 09:42:23 -0800800#ifdef CONFIG_IA64
801 {
Jes Sorensend2b176e2006-02-28 09:42:23 -0800802 .procname = "ignore-unaligned-usertrap",
803 .data = &no_unaligned_warning,
804 .maxlen = sizeof (int),
805 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800806 .proc_handler = proc_dointvec,
Jes Sorensend2b176e2006-02-28 09:42:23 -0800807 },
Doug Chapman88fc2412009-01-15 10:38:56 -0800808 {
Doug Chapman88fc2412009-01-15 10:38:56 -0800809 .procname = "unaligned-dump-stack",
810 .data = &unaligned_dump_stack,
811 .maxlen = sizeof (int),
812 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800813 .proc_handler = proc_dointvec,
Doug Chapman88fc2412009-01-15 10:38:56 -0800814 },
Jes Sorensend2b176e2006-02-28 09:42:23 -0800815#endif
Ravikiran G Thirumalaic4f3b632007-10-16 23:26:09 -0700816#ifdef CONFIG_DETECT_SOFTLOCKUP
817 {
Ingo Molnar9c44bc02008-05-12 21:21:04 +0200818 .procname = "softlockup_panic",
819 .data = &softlockup_panic,
820 .maxlen = sizeof(int),
821 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800822 .proc_handler = proc_dointvec_minmax,
Ingo Molnar9c44bc02008-05-12 21:21:04 +0200823 .extra1 = &zero,
824 .extra2 = &one,
825 },
826 {
Ravikiran G Thirumalaic4f3b632007-10-16 23:26:09 -0700827 .procname = "softlockup_thresh",
828 .data = &softlockup_thresh,
Dimitri Sivanich9383d962008-05-12 21:21:14 +0200829 .maxlen = sizeof(int),
Ravikiran G Thirumalaic4f3b632007-10-16 23:26:09 -0700830 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800831 .proc_handler = proc_dosoftlockup_thresh,
Dimitri Sivanich9383d962008-05-12 21:21:14 +0200832 .extra1 = &neg_one,
Ravikiran G Thirumalaic4f3b632007-10-16 23:26:09 -0700833 .extra2 = &sixty,
834 },
Mandeep Singh Bainese162b392009-01-15 11:08:40 -0800835#endif
836#ifdef CONFIG_DETECT_HUNG_TASK
837 {
Mandeep Singh Bainese162b392009-01-15 11:08:40 -0800838 .procname = "hung_task_panic",
839 .data = &sysctl_hung_task_panic,
840 .maxlen = sizeof(int),
841 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800842 .proc_handler = proc_dointvec_minmax,
Mandeep Singh Bainese162b392009-01-15 11:08:40 -0800843 .extra1 = &zero,
844 .extra2 = &one,
845 },
Ingo Molnar82a1fcb2008-01-25 21:08:02 +0100846 {
Ingo Molnar82a1fcb2008-01-25 21:08:02 +0100847 .procname = "hung_task_check_count",
848 .data = &sysctl_hung_task_check_count,
Ingo Molnar90739082008-01-25 21:08:34 +0100849 .maxlen = sizeof(unsigned long),
Ingo Molnar82a1fcb2008-01-25 21:08:02 +0100850 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800851 .proc_handler = proc_doulongvec_minmax,
Ingo Molnar82a1fcb2008-01-25 21:08:02 +0100852 },
853 {
Ingo Molnar82a1fcb2008-01-25 21:08:02 +0100854 .procname = "hung_task_timeout_secs",
855 .data = &sysctl_hung_task_timeout_secs,
Ingo Molnar90739082008-01-25 21:08:34 +0100856 .maxlen = sizeof(unsigned long),
Ingo Molnar82a1fcb2008-01-25 21:08:02 +0100857 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800858 .proc_handler = proc_dohung_task_timeout_secs,
Ingo Molnar82a1fcb2008-01-25 21:08:02 +0100859 },
860 {
Ingo Molnar82a1fcb2008-01-25 21:08:02 +0100861 .procname = "hung_task_warnings",
862 .data = &sysctl_hung_task_warnings,
Ingo Molnar90739082008-01-25 21:08:34 +0100863 .maxlen = sizeof(unsigned long),
Ingo Molnar82a1fcb2008-01-25 21:08:02 +0100864 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800865 .proc_handler = proc_doulongvec_minmax,
Ingo Molnar82a1fcb2008-01-25 21:08:02 +0100866 },
Ravikiran G Thirumalaic4f3b632007-10-16 23:26:09 -0700867#endif
Andi Kleenbebfa102006-06-26 13:56:52 +0200868#ifdef CONFIG_COMPAT
869 {
Andi Kleenbebfa102006-06-26 13:56:52 +0200870 .procname = "compat-log",
871 .data = &compat_log,
872 .maxlen = sizeof (int),
873 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800874 .proc_handler = proc_dointvec,
Andi Kleenbebfa102006-06-26 13:56:52 +0200875 },
876#endif
Ingo Molnar23f78d42006-06-27 02:54:53 -0700877#ifdef CONFIG_RT_MUTEXES
878 {
Ingo Molnar23f78d42006-06-27 02:54:53 -0700879 .procname = "max_lock_depth",
880 .data = &max_lock_depth,
881 .maxlen = sizeof(int),
882 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800883 .proc_handler = proc_dointvec,
Ingo Molnar23f78d42006-06-27 02:54:53 -0700884 },
885#endif
Jeremy Fitzhardinge10a0a8d2007-07-17 18:37:02 -0700886 {
Jeremy Fitzhardinge10a0a8d2007-07-17 18:37:02 -0700887 .procname = "poweroff_cmd",
888 .data = &poweroff_cmd,
889 .maxlen = POWEROFF_CMD_PATH_LEN,
890 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800891 .proc_handler = proc_dostring,
Jeremy Fitzhardinge10a0a8d2007-07-17 18:37:02 -0700892 },
David Howells0b77f5b2008-04-29 01:01:32 -0700893#ifdef CONFIG_KEYS
894 {
David Howells0b77f5b2008-04-29 01:01:32 -0700895 .procname = "keys",
896 .mode = 0555,
897 .child = key_sysctls,
898 },
899#endif
Paul E. McKenney31a72bc2008-06-18 09:26:49 -0700900#ifdef CONFIG_RCU_TORTURE_TEST
901 {
Paul E. McKenney31a72bc2008-06-18 09:26:49 -0700902 .procname = "rcutorture_runnable",
903 .data = &rcutorture_runnable,
904 .maxlen = sizeof(int),
905 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800906 .proc_handler = proc_dointvec,
Paul E. McKenney31a72bc2008-06-18 09:26:49 -0700907 },
908#endif
David Howells12e22c52009-04-03 16:42:35 +0100909#ifdef CONFIG_SLOW_WORK
910 {
David Howells12e22c52009-04-03 16:42:35 +0100911 .procname = "slow-work",
912 .mode = 0555,
913 .child = slow_work_sysctls,
914 },
915#endif
Ingo Molnarcdd6c482009-09-21 12:02:48 +0200916#ifdef CONFIG_PERF_EVENTS
Peter Zijlstra1ccd1542009-04-09 10:53:45 +0200917 {
Ingo Molnarcdd6c482009-09-21 12:02:48 +0200918 .procname = "perf_event_paranoid",
919 .data = &sysctl_perf_event_paranoid,
920 .maxlen = sizeof(sysctl_perf_event_paranoid),
Peter Zijlstra1ccd1542009-04-09 10:53:45 +0200921 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800922 .proc_handler = proc_dointvec,
Peter Zijlstra1ccd1542009-04-09 10:53:45 +0200923 },
Peter Zijlstrac5078f72009-05-05 17:50:24 +0200924 {
Ingo Molnarcdd6c482009-09-21 12:02:48 +0200925 .procname = "perf_event_mlock_kb",
926 .data = &sysctl_perf_event_mlock,
927 .maxlen = sizeof(sysctl_perf_event_mlock),
Peter Zijlstrac5078f72009-05-05 17:50:24 +0200928 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800929 .proc_handler = proc_dointvec,
Peter Zijlstrac5078f72009-05-05 17:50:24 +0200930 },
Peter Zijlstraa78ac322009-05-25 17:39:05 +0200931 {
Ingo Molnarcdd6c482009-09-21 12:02:48 +0200932 .procname = "perf_event_max_sample_rate",
933 .data = &sysctl_perf_event_sample_rate,
934 .maxlen = sizeof(sysctl_perf_event_sample_rate),
Peter Zijlstraa78ac322009-05-25 17:39:05 +0200935 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800936 .proc_handler = proc_dointvec,
Peter Zijlstraa78ac322009-05-25 17:39:05 +0200937 },
Peter Zijlstra1ccd1542009-04-09 10:53:45 +0200938#endif
Vegard Nossumdfec0722008-04-04 00:51:41 +0200939#ifdef CONFIG_KMEMCHECK
940 {
Vegard Nossumdfec0722008-04-04 00:51:41 +0200941 .procname = "kmemcheck",
942 .data = &kmemcheck_enabled,
943 .maxlen = sizeof(int),
944 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800945 .proc_handler = proc_dointvec,
Vegard Nossumdfec0722008-04-04 00:51:41 +0200946 },
947#endif
Jens Axboecb684b52009-09-15 21:53:11 +0200948#ifdef CONFIG_BLOCK
Jens Axboe5e605b62009-08-05 09:07:21 +0200949 {
Jens Axboe5e605b62009-08-05 09:07:21 +0200950 .procname = "blk_iopoll",
951 .data = &blk_iopoll_enabled,
952 .maxlen = sizeof(int),
953 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800954 .proc_handler = proc_dointvec,
Jens Axboe5e605b62009-08-05 09:07:21 +0200955 },
Jens Axboecb684b52009-09-15 21:53:11 +0200956#endif
Andrew Mortoned2c12f2007-07-19 01:50:35 -0700957/*
958 * NOTE: do not add new entries to this table unless you have read
959 * Documentation/sysctl/ctl_unnumbered.txt
960 */
Eric W. Biederman6fce56e2009-04-03 02:30:53 -0700961 { }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700962};
963
Eric W. Biedermand8217f02007-10-18 03:05:22 -0700964static struct ctl_table vm_table[] = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700965 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700966 .procname = "overcommit_memory",
967 .data = &sysctl_overcommit_memory,
968 .maxlen = sizeof(sysctl_overcommit_memory),
969 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800970 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700971 },
972 {
KAMEZAWA Hiroyukifadd8fb2006-06-23 02:03:13 -0700973 .procname = "panic_on_oom",
974 .data = &sysctl_panic_on_oom,
975 .maxlen = sizeof(sysctl_panic_on_oom),
976 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800977 .proc_handler = proc_dointvec,
KAMEZAWA Hiroyukifadd8fb2006-06-23 02:03:13 -0700978 },
979 {
David Rientjesfe071d72007-10-16 23:25:56 -0700980 .procname = "oom_kill_allocating_task",
981 .data = &sysctl_oom_kill_allocating_task,
982 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
983 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800984 .proc_handler = proc_dointvec,
David Rientjesfe071d72007-10-16 23:25:56 -0700985 },
986 {
David Rientjesfef1bdd2008-02-07 00:14:07 -0800987 .procname = "oom_dump_tasks",
988 .data = &sysctl_oom_dump_tasks,
989 .maxlen = sizeof(sysctl_oom_dump_tasks),
990 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800991 .proc_handler = proc_dointvec,
David Rientjesfef1bdd2008-02-07 00:14:07 -0800992 },
993 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700994 .procname = "overcommit_ratio",
995 .data = &sysctl_overcommit_ratio,
996 .maxlen = sizeof(sysctl_overcommit_ratio),
997 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800998 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700999 },
1000 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001001 .procname = "page-cluster",
1002 .data = &page_cluster,
1003 .maxlen = sizeof(int),
1004 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001005 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001006 },
1007 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001008 .procname = "dirty_background_ratio",
1009 .data = &dirty_background_ratio,
1010 .maxlen = sizeof(dirty_background_ratio),
1011 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001012 .proc_handler = dirty_background_ratio_handler,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001013 .extra1 = &zero,
1014 .extra2 = &one_hundred,
1015 },
1016 {
David Rientjes2da02992009-01-06 14:39:31 -08001017 .procname = "dirty_background_bytes",
1018 .data = &dirty_background_bytes,
1019 .maxlen = sizeof(dirty_background_bytes),
1020 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001021 .proc_handler = dirty_background_bytes_handler,
Sven Wegenerfc3501d2009-02-11 13:04:23 -08001022 .extra1 = &one_ul,
David Rientjes2da02992009-01-06 14:39:31 -08001023 },
1024 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001025 .procname = "dirty_ratio",
1026 .data = &vm_dirty_ratio,
1027 .maxlen = sizeof(vm_dirty_ratio),
1028 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001029 .proc_handler = dirty_ratio_handler,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001030 .extra1 = &zero,
1031 .extra2 = &one_hundred,
1032 },
1033 {
David Rientjes2da02992009-01-06 14:39:31 -08001034 .procname = "dirty_bytes",
1035 .data = &vm_dirty_bytes,
1036 .maxlen = sizeof(vm_dirty_bytes),
1037 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001038 .proc_handler = dirty_bytes_handler,
Andrea Righi9e4a5bd2009-04-30 15:08:57 -07001039 .extra1 = &dirty_bytes_min,
David Rientjes2da02992009-01-06 14:39:31 -08001040 },
1041 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001042 .procname = "dirty_writeback_centisecs",
Bart Samwelf6ef9432006-03-24 03:15:48 -08001043 .data = &dirty_writeback_interval,
1044 .maxlen = sizeof(dirty_writeback_interval),
Linus Torvalds1da177e2005-04-16 15:20:36 -07001045 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001046 .proc_handler = dirty_writeback_centisecs_handler,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001047 },
1048 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001049 .procname = "dirty_expire_centisecs",
Bart Samwelf6ef9432006-03-24 03:15:48 -08001050 .data = &dirty_expire_interval,
1051 .maxlen = sizeof(dirty_expire_interval),
Linus Torvalds1da177e2005-04-16 15:20:36 -07001052 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001053 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001054 },
1055 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001056 .procname = "nr_pdflush_threads",
1057 .data = &nr_pdflush_threads,
1058 .maxlen = sizeof nr_pdflush_threads,
1059 .mode = 0444 /* read-only*/,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001060 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001061 },
1062 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001063 .procname = "swappiness",
1064 .data = &vm_swappiness,
1065 .maxlen = sizeof(vm_swappiness),
1066 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001067 .proc_handler = proc_dointvec_minmax,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001068 .extra1 = &zero,
1069 .extra2 = &one_hundred,
1070 },
1071#ifdef CONFIG_HUGETLB_PAGE
Lee Schermerhorn06808b02009-12-14 17:58:21 -08001072 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001073 .procname = "nr_hugepages",
Andi Kleene5ff2152008-07-23 21:27:42 -07001074 .data = NULL,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001075 .maxlen = sizeof(unsigned long),
1076 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001077 .proc_handler = hugetlb_sysctl_handler,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001078 .extra1 = (void *)&hugetlb_zero,
1079 .extra2 = (void *)&hugetlb_infinity,
Lee Schermerhorn06808b02009-12-14 17:58:21 -08001080 },
1081#ifdef CONFIG_NUMA
1082 {
1083 .procname = "nr_hugepages_mempolicy",
1084 .data = NULL,
1085 .maxlen = sizeof(unsigned long),
1086 .mode = 0644,
1087 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
1088 .extra1 = (void *)&hugetlb_zero,
1089 .extra2 = (void *)&hugetlb_infinity,
1090 },
1091#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001092 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001093 .procname = "hugetlb_shm_group",
1094 .data = &sysctl_hugetlb_shm_group,
1095 .maxlen = sizeof(gid_t),
1096 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001097 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001098 },
Mel Gorman396faf02007-07-17 04:03:13 -07001099 {
Mel Gorman396faf02007-07-17 04:03:13 -07001100 .procname = "hugepages_treat_as_movable",
1101 .data = &hugepages_treat_as_movable,
1102 .maxlen = sizeof(int),
1103 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001104 .proc_handler = hugetlb_treat_movable_handler,
Mel Gorman396faf02007-07-17 04:03:13 -07001105 },
Adam Litke54f9f802007-10-16 01:26:20 -07001106 {
Nishanth Aravamudand1c3fb12007-12-17 16:20:12 -08001107 .procname = "nr_overcommit_hugepages",
Andi Kleene5ff2152008-07-23 21:27:42 -07001108 .data = NULL,
1109 .maxlen = sizeof(unsigned long),
Nishanth Aravamudand1c3fb12007-12-17 16:20:12 -08001110 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001111 .proc_handler = hugetlb_overcommit_handler,
Andi Kleene5ff2152008-07-23 21:27:42 -07001112 .extra1 = (void *)&hugetlb_zero,
1113 .extra2 = (void *)&hugetlb_infinity,
Nishanth Aravamudand1c3fb12007-12-17 16:20:12 -08001114 },
Linus Torvalds1da177e2005-04-16 15:20:36 -07001115#endif
1116 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001117 .procname = "lowmem_reserve_ratio",
1118 .data = &sysctl_lowmem_reserve_ratio,
1119 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1120 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001121 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001122 },
1123 {
Andrew Morton9d0243b2006-01-08 01:00:39 -08001124 .procname = "drop_caches",
1125 .data = &sysctl_drop_caches,
1126 .maxlen = sizeof(int),
1127 .mode = 0644,
1128 .proc_handler = drop_caches_sysctl_handler,
Andrew Morton9d0243b2006-01-08 01:00:39 -08001129 },
Mel Gorman76ab0f52010-05-24 14:32:28 -07001130#ifdef CONFIG_COMPACTION
1131 {
1132 .procname = "compact_memory",
1133 .data = &sysctl_compact_memory,
1134 .maxlen = sizeof(int),
1135 .mode = 0200,
1136 .proc_handler = sysctl_compaction_handler,
1137 },
Mel Gorman5e771902010-05-24 14:32:31 -07001138 {
1139 .procname = "extfrag_threshold",
1140 .data = &sysctl_extfrag_threshold,
1141 .maxlen = sizeof(int),
1142 .mode = 0644,
1143 .proc_handler = sysctl_extfrag_handler,
1144 .extra1 = &min_extfrag_threshold,
1145 .extra2 = &max_extfrag_threshold,
1146 },
1147
Mel Gorman76ab0f52010-05-24 14:32:28 -07001148#endif /* CONFIG_COMPACTION */
Andrew Morton9d0243b2006-01-08 01:00:39 -08001149 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001150 .procname = "min_free_kbytes",
1151 .data = &min_free_kbytes,
1152 .maxlen = sizeof(min_free_kbytes),
1153 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001154 .proc_handler = min_free_kbytes_sysctl_handler,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001155 .extra1 = &zero,
1156 },
Rohit Seth8ad4b1f2006-01-08 01:00:40 -08001157 {
Rohit Seth8ad4b1f2006-01-08 01:00:40 -08001158 .procname = "percpu_pagelist_fraction",
1159 .data = &percpu_pagelist_fraction,
1160 .maxlen = sizeof(percpu_pagelist_fraction),
1161 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001162 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
Rohit Seth8ad4b1f2006-01-08 01:00:40 -08001163 .extra1 = &min_percpu_pagelist_fract,
1164 },
Linus Torvalds1da177e2005-04-16 15:20:36 -07001165#ifdef CONFIG_MMU
1166 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001167 .procname = "max_map_count",
1168 .data = &sysctl_max_map_count,
1169 .maxlen = sizeof(sysctl_max_map_count),
1170 .mode = 0644,
WANG Cong3e261202009-12-17 15:27:05 -08001171 .proc_handler = proc_dointvec_minmax,
Amerigo Wang70da2342009-12-14 17:59:52 -08001172 .extra1 = &zero,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001173 },
Paul Mundtdd8632a2009-01-08 12:04:47 +00001174#else
1175 {
Paul Mundtdd8632a2009-01-08 12:04:47 +00001176 .procname = "nr_trim_pages",
1177 .data = &sysctl_nr_trim_pages,
1178 .maxlen = sizeof(sysctl_nr_trim_pages),
1179 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001180 .proc_handler = proc_dointvec_minmax,
Paul Mundtdd8632a2009-01-08 12:04:47 +00001181 .extra1 = &zero,
1182 },
Linus Torvalds1da177e2005-04-16 15:20:36 -07001183#endif
1184 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001185 .procname = "laptop_mode",
1186 .data = &laptop_mode,
1187 .maxlen = sizeof(laptop_mode),
1188 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001189 .proc_handler = proc_dointvec_jiffies,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001190 },
1191 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001192 .procname = "block_dump",
1193 .data = &block_dump,
1194 .maxlen = sizeof(block_dump),
1195 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001196 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001197 .extra1 = &zero,
1198 },
1199 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001200 .procname = "vfs_cache_pressure",
1201 .data = &sysctl_vfs_cache_pressure,
1202 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1203 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001204 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001205 .extra1 = &zero,
1206 },
1207#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1208 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001209 .procname = "legacy_va_layout",
1210 .data = &sysctl_legacy_va_layout,
1211 .maxlen = sizeof(sysctl_legacy_va_layout),
1212 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001213 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001214 .extra1 = &zero,
1215 },
1216#endif
Christoph Lameter17436602006-01-18 17:42:32 -08001217#ifdef CONFIG_NUMA
1218 {
Christoph Lameter17436602006-01-18 17:42:32 -08001219 .procname = "zone_reclaim_mode",
1220 .data = &zone_reclaim_mode,
1221 .maxlen = sizeof(zone_reclaim_mode),
1222 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001223 .proc_handler = proc_dointvec,
Christoph Lameterc84db232006-02-01 03:05:29 -08001224 .extra1 = &zero,
Christoph Lameter17436602006-01-18 17:42:32 -08001225 },
Christoph Lameter96146342006-07-03 00:24:13 -07001226 {
Christoph Lameter96146342006-07-03 00:24:13 -07001227 .procname = "min_unmapped_ratio",
1228 .data = &sysctl_min_unmapped_ratio,
1229 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1230 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001231 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
Christoph Lameter96146342006-07-03 00:24:13 -07001232 .extra1 = &zero,
1233 .extra2 = &one_hundred,
1234 },
Christoph Lameter0ff38492006-09-25 23:31:52 -07001235 {
Christoph Lameter0ff38492006-09-25 23:31:52 -07001236 .procname = "min_slab_ratio",
1237 .data = &sysctl_min_slab_ratio,
1238 .maxlen = sizeof(sysctl_min_slab_ratio),
1239 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001240 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
Christoph Lameter0ff38492006-09-25 23:31:52 -07001241 .extra1 = &zero,
1242 .extra2 = &one_hundred,
1243 },
Christoph Lameter17436602006-01-18 17:42:32 -08001244#endif
Christoph Lameter77461ab2007-05-09 02:35:13 -07001245#ifdef CONFIG_SMP
1246 {
Christoph Lameter77461ab2007-05-09 02:35:13 -07001247 .procname = "stat_interval",
1248 .data = &sysctl_stat_interval,
1249 .maxlen = sizeof(sysctl_stat_interval),
1250 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001251 .proc_handler = proc_dointvec_jiffies,
Christoph Lameter77461ab2007-05-09 02:35:13 -07001252 },
1253#endif
David Howells6e141542009-12-15 19:27:45 +00001254#ifdef CONFIG_MMU
Eric Parised032182007-06-28 15:55:21 -04001255 {
Eric Parised032182007-06-28 15:55:21 -04001256 .procname = "mmap_min_addr",
Eric Paris788084a2009-07-31 12:54:11 -04001257 .data = &dac_mmap_min_addr,
1258 .maxlen = sizeof(unsigned long),
Eric Parised032182007-06-28 15:55:21 -04001259 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001260 .proc_handler = mmap_min_addr_handler,
Eric Parised032182007-06-28 15:55:21 -04001261 },
David Howells6e141542009-12-15 19:27:45 +00001262#endif
KAMEZAWA Hiroyukif0c0b2b2007-07-15 23:38:01 -07001263#ifdef CONFIG_NUMA
1264 {
KAMEZAWA Hiroyukif0c0b2b2007-07-15 23:38:01 -07001265 .procname = "numa_zonelist_order",
1266 .data = &numa_zonelist_order,
1267 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1268 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001269 .proc_handler = numa_zonelist_order_handler,
KAMEZAWA Hiroyukif0c0b2b2007-07-15 23:38:01 -07001270 },
1271#endif
Al Viro2b8232c2007-10-13 08:16:04 +01001272#if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
Paul Mundt5c36e652007-03-01 10:07:42 +09001273 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
Ingo Molnare6e54942006-06-27 02:53:50 -07001274 {
Ingo Molnare6e54942006-06-27 02:53:50 -07001275 .procname = "vdso_enabled",
1276 .data = &vdso_enabled,
1277 .maxlen = sizeof(vdso_enabled),
1278 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001279 .proc_handler = proc_dointvec,
Ingo Molnare6e54942006-06-27 02:53:50 -07001280 .extra1 = &zero,
1281 },
1282#endif
Bron Gondwana195cf452008-02-04 22:29:20 -08001283#ifdef CONFIG_HIGHMEM
1284 {
Bron Gondwana195cf452008-02-04 22:29:20 -08001285 .procname = "highmem_is_dirtyable",
1286 .data = &vm_highmem_is_dirtyable,
1287 .maxlen = sizeof(vm_highmem_is_dirtyable),
1288 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001289 .proc_handler = proc_dointvec_minmax,
Bron Gondwana195cf452008-02-04 22:29:20 -08001290 .extra1 = &zero,
1291 .extra2 = &one,
1292 },
1293#endif
Peter Zijlstra4be6f6b2009-04-13 14:39:33 -07001294 {
Peter Zijlstra4be6f6b2009-04-13 14:39:33 -07001295 .procname = "scan_unevictable_pages",
1296 .data = &scan_unevictable_pages,
1297 .maxlen = sizeof(scan_unevictable_pages),
1298 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001299 .proc_handler = scan_unevictable_handler,
Peter Zijlstra4be6f6b2009-04-13 14:39:33 -07001300 },
Andi Kleen6a460792009-09-16 11:50:15 +02001301#ifdef CONFIG_MEMORY_FAILURE
1302 {
Andi Kleen6a460792009-09-16 11:50:15 +02001303 .procname = "memory_failure_early_kill",
1304 .data = &sysctl_memory_failure_early_kill,
1305 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1306 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001307 .proc_handler = proc_dointvec_minmax,
Andi Kleen6a460792009-09-16 11:50:15 +02001308 .extra1 = &zero,
1309 .extra2 = &one,
1310 },
1311 {
Andi Kleen6a460792009-09-16 11:50:15 +02001312 .procname = "memory_failure_recovery",
1313 .data = &sysctl_memory_failure_recovery,
1314 .maxlen = sizeof(sysctl_memory_failure_recovery),
1315 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001316 .proc_handler = proc_dointvec_minmax,
Andi Kleen6a460792009-09-16 11:50:15 +02001317 .extra1 = &zero,
1318 .extra2 = &one,
1319 },
1320#endif
1321
Andrew Morton2be7fe02007-07-15 23:41:21 -07001322/*
1323 * NOTE: do not add new entries to this table unless you have read
1324 * Documentation/sysctl/ctl_unnumbered.txt
1325 */
Eric W. Biederman6fce56e2009-04-03 02:30:53 -07001326 { }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001327};
1328
Eric W. Biederman2abc26f2007-02-14 00:34:07 -08001329#if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
Eric W. Biedermand8217f02007-10-18 03:05:22 -07001330static struct ctl_table binfmt_misc_table[] = {
Eric W. Biederman6fce56e2009-04-03 02:30:53 -07001331 { }
Eric W. Biederman2abc26f2007-02-14 00:34:07 -08001332};
1333#endif
1334
Eric W. Biedermand8217f02007-10-18 03:05:22 -07001335static struct ctl_table fs_table[] = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001336 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001337 .procname = "inode-nr",
1338 .data = &inodes_stat,
1339 .maxlen = 2*sizeof(int),
1340 .mode = 0444,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001341 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001342 },
1343 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001344 .procname = "inode-state",
1345 .data = &inodes_stat,
1346 .maxlen = 7*sizeof(int),
1347 .mode = 0444,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001348 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001349 },
1350 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001351 .procname = "file-nr",
1352 .data = &files_stat,
1353 .maxlen = 3*sizeof(int),
1354 .mode = 0444,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001355 .proc_handler = proc_nr_files,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001356 },
1357 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001358 .procname = "file-max",
1359 .data = &files_stat.max_files,
1360 .maxlen = sizeof(int),
1361 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001362 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001363 },
1364 {
Eric Dumazet9cfe0152008-02-06 01:37:16 -08001365 .procname = "nr_open",
1366 .data = &sysctl_nr_open,
1367 .maxlen = sizeof(int),
1368 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001369 .proc_handler = proc_dointvec_minmax,
Al Viroeceea0b2008-05-10 10:08:32 -04001370 .extra1 = &sysctl_nr_open_min,
1371 .extra2 = &sysctl_nr_open_max,
Eric Dumazet9cfe0152008-02-06 01:37:16 -08001372 },
1373 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001374 .procname = "dentry-state",
1375 .data = &dentry_stat,
1376 .maxlen = 6*sizeof(int),
1377 .mode = 0444,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001378 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001379 },
1380 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001381 .procname = "overflowuid",
1382 .data = &fs_overflowuid,
1383 .maxlen = sizeof(int),
1384 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001385 .proc_handler = proc_dointvec_minmax,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001386 .extra1 = &minolduid,
1387 .extra2 = &maxolduid,
1388 },
1389 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001390 .procname = "overflowgid",
1391 .data = &fs_overflowgid,
1392 .maxlen = sizeof(int),
1393 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001394 .proc_handler = proc_dointvec_minmax,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001395 .extra1 = &minolduid,
1396 .extra2 = &maxolduid,
1397 },
Thomas Petazzonibfcd17a2008-08-06 15:12:22 +02001398#ifdef CONFIG_FILE_LOCKING
Linus Torvalds1da177e2005-04-16 15:20:36 -07001399 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001400 .procname = "leases-enable",
1401 .data = &leases_enable,
1402 .maxlen = sizeof(int),
1403 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001404 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001405 },
Thomas Petazzonibfcd17a2008-08-06 15:12:22 +02001406#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001407#ifdef CONFIG_DNOTIFY
1408 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001409 .procname = "dir-notify-enable",
1410 .data = &dir_notify_enable,
1411 .maxlen = sizeof(int),
1412 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001413 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001414 },
1415#endif
1416#ifdef CONFIG_MMU
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 = "lease-break-time",
1420 .data = &lease_break_time,
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
Thomas Petazzoniebf3f092008-10-15 22:05:12 -07001426#ifdef CONFIG_AIO
Linus Torvalds1da177e2005-04-16 15:20:36 -07001427 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001428 .procname = "aio-nr",
1429 .data = &aio_nr,
1430 .maxlen = sizeof(aio_nr),
1431 .mode = 0444,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001432 .proc_handler = proc_doulongvec_minmax,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001433 },
1434 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001435 .procname = "aio-max-nr",
1436 .data = &aio_max_nr,
1437 .maxlen = sizeof(aio_max_nr),
1438 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001439 .proc_handler = proc_doulongvec_minmax,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001440 },
Thomas Petazzoniebf3f092008-10-15 22:05:12 -07001441#endif /* CONFIG_AIO */
Amy Griffis2d9048e2006-06-01 13:10:59 -07001442#ifdef CONFIG_INOTIFY_USER
Robert Love0399cb02005-07-13 12:38:18 -04001443 {
Robert Love0399cb02005-07-13 12:38:18 -04001444 .procname = "inotify",
1445 .mode = 0555,
1446 .child = inotify_table,
1447 },
1448#endif
Davide Libenzi7ef99642008-12-01 13:13:55 -08001449#ifdef CONFIG_EPOLL
1450 {
1451 .procname = "epoll",
1452 .mode = 0555,
1453 .child = epoll_table,
1454 },
1455#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001456#endif
Alan Coxd6e71142005-06-23 00:09:43 -07001457 {
Alan Coxd6e71142005-06-23 00:09:43 -07001458 .procname = "suid_dumpable",
1459 .data = &suid_dumpable,
1460 .maxlen = sizeof(int),
1461 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001462 .proc_handler = proc_dointvec_minmax,
Matthew Wilcox8e654fb2009-04-02 16:58:33 -07001463 .extra1 = &zero,
1464 .extra2 = &two,
Alan Coxd6e71142005-06-23 00:09:43 -07001465 },
Eric W. Biederman2abc26f2007-02-14 00:34:07 -08001466#if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1467 {
Eric W. Biederman2abc26f2007-02-14 00:34:07 -08001468 .procname = "binfmt_misc",
1469 .mode = 0555,
1470 .child = binfmt_misc_table,
1471 },
1472#endif
Jens Axboeb492e952010-05-19 21:03:16 +02001473 {
1474 .procname = "pipe-max-pages",
1475 .data = &pipe_max_pages,
1476 .maxlen = sizeof(int),
1477 .mode = 0644,
1478 .proc_handler = &proc_dointvec_minmax,
1479 .extra1 = &two,
1480 },
Andrew Morton2be7fe02007-07-15 23:41:21 -07001481/*
1482 * NOTE: do not add new entries to this table unless you have read
1483 * Documentation/sysctl/ctl_unnumbered.txt
1484 */
Eric W. Biederman6fce56e2009-04-03 02:30:53 -07001485 { }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001486};
1487
Eric W. Biedermand8217f02007-10-18 03:05:22 -07001488static struct ctl_table debug_table[] = {
Heiko Carstensab3c68e2010-05-17 10:00:21 +02001489#if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_SPARC) || \
1490 defined(CONFIG_S390)
Masoud Asgharifard Sharbianiabd4f752007-07-22 11:12:28 +02001491 {
Masoud Asgharifard Sharbianiabd4f752007-07-22 11:12:28 +02001492 .procname = "exception-trace",
1493 .data = &show_unhandled_signals,
1494 .maxlen = sizeof(int),
1495 .mode = 0644,
1496 .proc_handler = proc_dointvec
1497 },
1498#endif
Masami Hiramatsub2be84d2010-02-25 08:34:15 -05001499#if defined(CONFIG_OPTPROBES)
1500 {
1501 .procname = "kprobes-optimization",
1502 .data = &sysctl_kprobes_optimization,
1503 .maxlen = sizeof(int),
1504 .mode = 0644,
1505 .proc_handler = proc_kprobes_optimization_handler,
1506 .extra1 = &zero,
1507 .extra2 = &one,
1508 },
1509#endif
Eric W. Biederman6fce56e2009-04-03 02:30:53 -07001510 { }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001511};
1512
Eric W. Biedermand8217f02007-10-18 03:05:22 -07001513static struct ctl_table dev_table[] = {
Eric W. Biederman6fce56e2009-04-03 02:30:53 -07001514 { }
Robert Love0eeca282005-07-12 17:06:03 -04001515};
Linus Torvalds1da177e2005-04-16 15:20:36 -07001516
Al Viro330d57f2005-11-04 10:18:40 +00001517static DEFINE_SPINLOCK(sysctl_lock);
1518
1519/* called under sysctl_lock */
1520static int use_table(struct ctl_table_header *p)
1521{
1522 if (unlikely(p->unregistering))
1523 return 0;
1524 p->used++;
1525 return 1;
1526}
1527
1528/* called under sysctl_lock */
1529static void unuse_table(struct ctl_table_header *p)
1530{
1531 if (!--p->used)
1532 if (unlikely(p->unregistering))
1533 complete(p->unregistering);
1534}
1535
1536/* called under sysctl_lock, will reacquire if has to wait */
1537static void start_unregistering(struct ctl_table_header *p)
1538{
1539 /*
1540 * if p->used is 0, nobody will ever touch that entry again;
1541 * we'll eliminate all paths to it before dropping sysctl_lock
1542 */
1543 if (unlikely(p->used)) {
1544 struct completion wait;
1545 init_completion(&wait);
1546 p->unregistering = &wait;
1547 spin_unlock(&sysctl_lock);
1548 wait_for_completion(&wait);
1549 spin_lock(&sysctl_lock);
Al Virof7e6ced2008-07-15 01:44:23 -04001550 } else {
1551 /* anything non-NULL; we'll never dereference it */
1552 p->unregistering = ERR_PTR(-EINVAL);
Al Viro330d57f2005-11-04 10:18:40 +00001553 }
1554 /*
1555 * do not remove from the list until nobody holds it; walking the
1556 * list in do_sysctl() relies on that.
1557 */
1558 list_del_init(&p->ctl_entry);
1559}
1560
Al Virof7e6ced2008-07-15 01:44:23 -04001561void sysctl_head_get(struct ctl_table_header *head)
1562{
1563 spin_lock(&sysctl_lock);
1564 head->count++;
1565 spin_unlock(&sysctl_lock);
1566}
1567
1568void sysctl_head_put(struct ctl_table_header *head)
1569{
1570 spin_lock(&sysctl_lock);
1571 if (!--head->count)
1572 kfree(head);
1573 spin_unlock(&sysctl_lock);
1574}
1575
1576struct ctl_table_header *sysctl_head_grab(struct ctl_table_header *head)
1577{
1578 if (!head)
1579 BUG();
1580 spin_lock(&sysctl_lock);
1581 if (!use_table(head))
1582 head = ERR_PTR(-ENOENT);
1583 spin_unlock(&sysctl_lock);
1584 return head;
1585}
1586
Eric W. Biederman805b5d52007-02-14 00:34:11 -08001587void sysctl_head_finish(struct ctl_table_header *head)
1588{
1589 if (!head)
1590 return;
1591 spin_lock(&sysctl_lock);
1592 unuse_table(head);
1593 spin_unlock(&sysctl_lock);
1594}
1595
Al Viro73455092008-07-14 21:22:20 -04001596static struct ctl_table_set *
1597lookup_header_set(struct ctl_table_root *root, struct nsproxy *namespaces)
1598{
1599 struct ctl_table_set *set = &root->default_set;
1600 if (root->lookup)
1601 set = root->lookup(root, namespaces);
1602 return set;
1603}
1604
Eric W. Biedermane51b6ba2007-11-30 23:54:00 +11001605static struct list_head *
1606lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces)
Eric W. Biederman805b5d52007-02-14 00:34:11 -08001607{
Al Viro73455092008-07-14 21:22:20 -04001608 struct ctl_table_set *set = lookup_header_set(root, namespaces);
1609 return &set->list;
Eric W. Biedermane51b6ba2007-11-30 23:54:00 +11001610}
1611
1612struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces,
1613 struct ctl_table_header *prev)
1614{
1615 struct ctl_table_root *root;
1616 struct list_head *header_list;
Eric W. Biederman805b5d52007-02-14 00:34:11 -08001617 struct ctl_table_header *head;
1618 struct list_head *tmp;
Eric W. Biedermane51b6ba2007-11-30 23:54:00 +11001619
Eric W. Biederman805b5d52007-02-14 00:34:11 -08001620 spin_lock(&sysctl_lock);
1621 if (prev) {
Eric W. Biedermane51b6ba2007-11-30 23:54:00 +11001622 head = prev;
Eric W. Biederman805b5d52007-02-14 00:34:11 -08001623 tmp = &prev->ctl_entry;
1624 unuse_table(prev);
1625 goto next;
1626 }
1627 tmp = &root_table_header.ctl_entry;
1628 for (;;) {
1629 head = list_entry(tmp, struct ctl_table_header, ctl_entry);
1630
1631 if (!use_table(head))
1632 goto next;
1633 spin_unlock(&sysctl_lock);
1634 return head;
1635 next:
Eric W. Biedermane51b6ba2007-11-30 23:54:00 +11001636 root = head->root;
Eric W. Biederman805b5d52007-02-14 00:34:11 -08001637 tmp = tmp->next;
Eric W. Biedermane51b6ba2007-11-30 23:54:00 +11001638 header_list = lookup_header_list(root, namespaces);
1639 if (tmp != header_list)
1640 continue;
1641
1642 do {
1643 root = list_entry(root->root_list.next,
1644 struct ctl_table_root, root_list);
1645 if (root == &sysctl_table_root)
1646 goto out;
1647 header_list = lookup_header_list(root, namespaces);
1648 } while (list_empty(header_list));
1649 tmp = header_list->next;
Eric W. Biederman805b5d52007-02-14 00:34:11 -08001650 }
Eric W. Biedermane51b6ba2007-11-30 23:54:00 +11001651out:
Eric W. Biederman805b5d52007-02-14 00:34:11 -08001652 spin_unlock(&sysctl_lock);
1653 return NULL;
1654}
1655
Eric W. Biedermane51b6ba2007-11-30 23:54:00 +11001656struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev)
1657{
1658 return __sysctl_head_next(current->nsproxy, prev);
1659}
1660
1661void register_sysctl_root(struct ctl_table_root *root)
1662{
1663 spin_lock(&sysctl_lock);
1664 list_add_tail(&root->root_list, &sysctl_table_root.root_list);
1665 spin_unlock(&sysctl_lock);
1666}
1667
Linus Torvalds1da177e2005-04-16 15:20:36 -07001668/*
Eric W. Biederman1ff007e2007-02-14 00:34:11 -08001669 * sysctl_perm does NOT grant the superuser all rights automatically, because
Linus Torvalds1da177e2005-04-16 15:20:36 -07001670 * some sysctl variables are readonly even to root.
1671 */
1672
1673static int test_perm(int mode, int op)
1674{
David Howells76aac0e2008-11-14 10:39:12 +11001675 if (!current_euid())
Linus Torvalds1da177e2005-04-16 15:20:36 -07001676 mode >>= 6;
1677 else if (in_egroup_p(0))
1678 mode >>= 3;
Al Viroe6305c42008-07-15 21:03:57 -04001679 if ((op & ~mode & (MAY_READ|MAY_WRITE|MAY_EXEC)) == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001680 return 0;
1681 return -EACCES;
1682}
1683
Pavel Emelyanovd7321cd2008-04-29 01:02:44 -07001684int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001685{
1686 int error;
Pavel Emelyanovd7321cd2008-04-29 01:02:44 -07001687 int mode;
1688
Al Viroe6305c42008-07-15 21:03:57 -04001689 error = security_sysctl(table, op & (MAY_READ | MAY_WRITE | MAY_EXEC));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001690 if (error)
1691 return error;
Pavel Emelyanovd7321cd2008-04-29 01:02:44 -07001692
1693 if (root->permissions)
1694 mode = root->permissions(root, current->nsproxy, table);
1695 else
1696 mode = table->mode;
1697
1698 return test_perm(mode, op);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001699}
1700
Eric W. Biedermand912b0c2007-02-14 00:34:13 -08001701static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table)
1702{
Eric W. Biederman2315ffa2009-04-03 03:18:02 -07001703 for (; table->procname; table++) {
Eric W. Biedermand912b0c2007-02-14 00:34:13 -08001704 table->parent = parent;
1705 if (table->child)
1706 sysctl_set_parent(table, table->child);
1707 }
1708}
1709
1710static __init int sysctl_init(void)
1711{
1712 sysctl_set_parent(NULL, root_table);
Holger Schurig88f458e2008-04-29 01:02:36 -07001713#ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1714 {
1715 int err;
1716 err = sysctl_check_table(current->nsproxy, root_table);
1717 }
1718#endif
Eric W. Biedermand912b0c2007-02-14 00:34:13 -08001719 return 0;
1720}
1721
1722core_initcall(sysctl_init);
1723
Al Virobfbcf032008-07-27 06:31:22 +01001724static struct ctl_table *is_branch_in(struct ctl_table *branch,
1725 struct ctl_table *table)
Al Viroae7edec2008-07-15 06:33:31 -04001726{
1727 struct ctl_table *p;
1728 const char *s = branch->procname;
1729
1730 /* branch should have named subdirectory as its first element */
1731 if (!s || !branch->child)
Al Virobfbcf032008-07-27 06:31:22 +01001732 return NULL;
Al Viroae7edec2008-07-15 06:33:31 -04001733
1734 /* ... and nothing else */
Eric W. Biederman2315ffa2009-04-03 03:18:02 -07001735 if (branch[1].procname)
Al Virobfbcf032008-07-27 06:31:22 +01001736 return NULL;
Al Viroae7edec2008-07-15 06:33:31 -04001737
1738 /* table should contain subdirectory with the same name */
Eric W. Biederman2315ffa2009-04-03 03:18:02 -07001739 for (p = table; p->procname; p++) {
Al Viroae7edec2008-07-15 06:33:31 -04001740 if (!p->child)
1741 continue;
1742 if (p->procname && strcmp(p->procname, s) == 0)
Al Virobfbcf032008-07-27 06:31:22 +01001743 return p;
Al Viroae7edec2008-07-15 06:33:31 -04001744 }
Al Virobfbcf032008-07-27 06:31:22 +01001745 return NULL;
Al Viroae7edec2008-07-15 06:33:31 -04001746}
1747
1748/* see if attaching q to p would be an improvement */
1749static void try_attach(struct ctl_table_header *p, struct ctl_table_header *q)
1750{
1751 struct ctl_table *to = p->ctl_table, *by = q->ctl_table;
Al Virobfbcf032008-07-27 06:31:22 +01001752 struct ctl_table *next;
Al Viroae7edec2008-07-15 06:33:31 -04001753 int is_better = 0;
1754 int not_in_parent = !p->attached_by;
1755
Al Virobfbcf032008-07-27 06:31:22 +01001756 while ((next = is_branch_in(by, to)) != NULL) {
Al Viroae7edec2008-07-15 06:33:31 -04001757 if (by == q->attached_by)
1758 is_better = 1;
1759 if (to == p->attached_by)
1760 not_in_parent = 1;
1761 by = by->child;
Al Virobfbcf032008-07-27 06:31:22 +01001762 to = next->child;
Al Viroae7edec2008-07-15 06:33:31 -04001763 }
1764
1765 if (is_better && not_in_parent) {
1766 q->attached_by = by;
1767 q->attached_to = to;
1768 q->parent = p;
1769 }
1770}
1771
Linus Torvalds1da177e2005-04-16 15:20:36 -07001772/**
Eric W. Biedermane51b6ba2007-11-30 23:54:00 +11001773 * __register_sysctl_paths - register a sysctl hierarchy
1774 * @root: List of sysctl headers to register on
1775 * @namespaces: Data to compute which lists of sysctl entries are visible
Eric W. Biederman29e796f2007-11-30 23:50:18 +11001776 * @path: The path to the directory the sysctl table is in.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001777 * @table: the top-level table structure
Linus Torvalds1da177e2005-04-16 15:20:36 -07001778 *
1779 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
Eric W. Biederman29e796f2007-11-30 23:50:18 +11001780 * array. A completely 0 filled entry terminates the table.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001781 *
Eric W. Biedermand8217f02007-10-18 03:05:22 -07001782 * The members of the &struct ctl_table structure are used as follows:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001783 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07001784 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1785 * enter a sysctl file
1786 *
1787 * data - a pointer to data for use by proc_handler
1788 *
1789 * maxlen - the maximum size in bytes of the data
1790 *
1791 * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1792 *
1793 * child - a pointer to the child sysctl table if this entry is a directory, or
1794 * %NULL.
1795 *
1796 * proc_handler - the text handler routine (described below)
1797 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07001798 * de - for internal use by the sysctl routines
1799 *
1800 * extra1, extra2 - extra pointers usable by the proc handler routines
1801 *
1802 * Leaf nodes in the sysctl tree will be represented by a single file
1803 * under /proc; non-leaf nodes will be represented by directories.
1804 *
1805 * sysctl(2) can automatically manage read and write requests through
1806 * the sysctl table. The data and maxlen fields of the ctl_table
1807 * struct enable minimal validation of the values being written to be
1808 * performed, and the mode field allows minimal authentication.
1809 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07001810 * There must be a proc_handler routine for any terminal nodes
1811 * mirrored under /proc/sys (non-terminals are handled by a built-in
1812 * directory handler). Several default handlers are available to
1813 * cover common cases -
1814 *
1815 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1816 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1817 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1818 *
1819 * It is the handler's job to read the input buffer from user memory
1820 * and process it. The handler should return 0 on success.
1821 *
1822 * This routine returns %NULL on a failure to register, and a pointer
1823 * to the table header on success.
1824 */
Eric W. Biedermane51b6ba2007-11-30 23:54:00 +11001825struct ctl_table_header *__register_sysctl_paths(
1826 struct ctl_table_root *root,
1827 struct nsproxy *namespaces,
1828 const struct ctl_path *path, struct ctl_table *table)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001829{
Eric W. Biederman29e796f2007-11-30 23:50:18 +11001830 struct ctl_table_header *header;
1831 struct ctl_table *new, **prevp;
1832 unsigned int n, npath;
Al Viroae7edec2008-07-15 06:33:31 -04001833 struct ctl_table_set *set;
Eric W. Biederman29e796f2007-11-30 23:50:18 +11001834
1835 /* Count the path components */
Eric W. Biederman2315ffa2009-04-03 03:18:02 -07001836 for (npath = 0; path[npath].procname; ++npath)
Eric W. Biederman29e796f2007-11-30 23:50:18 +11001837 ;
1838
1839 /*
1840 * For each path component, allocate a 2-element ctl_table array.
1841 * The first array element will be filled with the sysctl entry
Eric W. Biederman2315ffa2009-04-03 03:18:02 -07001842 * for this, the second will be the sentinel (procname == 0).
Eric W. Biederman29e796f2007-11-30 23:50:18 +11001843 *
1844 * We allocate everything in one go so that we don't have to
1845 * worry about freeing additional memory in unregister_sysctl_table.
1846 */
1847 header = kzalloc(sizeof(struct ctl_table_header) +
1848 (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL);
1849 if (!header)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001850 return NULL;
Eric W. Biederman29e796f2007-11-30 23:50:18 +11001851
1852 new = (struct ctl_table *) (header + 1);
1853
1854 /* Now connect the dots */
1855 prevp = &header->ctl_table;
1856 for (n = 0; n < npath; ++n, ++path) {
1857 /* Copy the procname */
1858 new->procname = path->procname;
Eric W. Biederman29e796f2007-11-30 23:50:18 +11001859 new->mode = 0555;
1860
1861 *prevp = new;
1862 prevp = &new->child;
1863
1864 new += 2;
1865 }
1866 *prevp = table;
Eric W. Biederman23eb06d2007-11-30 23:52:10 +11001867 header->ctl_table_arg = table;
Eric W. Biederman29e796f2007-11-30 23:50:18 +11001868
1869 INIT_LIST_HEAD(&header->ctl_entry);
1870 header->used = 0;
1871 header->unregistering = NULL;
Eric W. Biedermane51b6ba2007-11-30 23:54:00 +11001872 header->root = root;
Eric W. Biederman29e796f2007-11-30 23:50:18 +11001873 sysctl_set_parent(NULL, header->ctl_table);
Al Virof7e6ced2008-07-15 01:44:23 -04001874 header->count = 1;
Holger Schurig88f458e2008-04-29 01:02:36 -07001875#ifdef CONFIG_SYSCTL_SYSCALL_CHECK
Eric W. Biedermane51b6ba2007-11-30 23:54:00 +11001876 if (sysctl_check_table(namespaces, header->ctl_table)) {
Eric W. Biederman29e796f2007-11-30 23:50:18 +11001877 kfree(header);
Eric W. Biedermanfc6cd252007-10-18 03:05:54 -07001878 return NULL;
1879 }
Holger Schurig88f458e2008-04-29 01:02:36 -07001880#endif
Al Viro330d57f2005-11-04 10:18:40 +00001881 spin_lock(&sysctl_lock);
Al Viro73455092008-07-14 21:22:20 -04001882 header->set = lookup_header_set(root, namespaces);
Al Viroae7edec2008-07-15 06:33:31 -04001883 header->attached_by = header->ctl_table;
1884 header->attached_to = root_table;
1885 header->parent = &root_table_header;
1886 for (set = header->set; set; set = set->parent) {
1887 struct ctl_table_header *p;
1888 list_for_each_entry(p, &set->list, ctl_entry) {
1889 if (p->unregistering)
1890 continue;
1891 try_attach(p, header);
1892 }
1893 }
1894 header->parent->count++;
Al Viro73455092008-07-14 21:22:20 -04001895 list_add_tail(&header->ctl_entry, &header->set->list);
Al Viro330d57f2005-11-04 10:18:40 +00001896 spin_unlock(&sysctl_lock);
Eric W. Biederman29e796f2007-11-30 23:50:18 +11001897
1898 return header;
1899}
1900
1901/**
Eric W. Biedermane51b6ba2007-11-30 23:54:00 +11001902 * register_sysctl_table_path - register a sysctl table hierarchy
1903 * @path: The path to the directory the sysctl table is in.
1904 * @table: the top-level table structure
1905 *
1906 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1907 * array. A completely 0 filled entry terminates the table.
1908 *
1909 * See __register_sysctl_paths for more details.
1910 */
1911struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1912 struct ctl_table *table)
1913{
1914 return __register_sysctl_paths(&sysctl_table_root, current->nsproxy,
1915 path, table);
1916}
1917
1918/**
Eric W. Biederman29e796f2007-11-30 23:50:18 +11001919 * register_sysctl_table - register a sysctl table hierarchy
1920 * @table: the top-level table structure
1921 *
1922 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1923 * array. A completely 0 filled entry terminates the table.
1924 *
1925 * See register_sysctl_paths for more details.
1926 */
1927struct ctl_table_header *register_sysctl_table(struct ctl_table *table)
1928{
1929 static const struct ctl_path null_path[] = { {} };
1930
1931 return register_sysctl_paths(null_path, table);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001932}
1933
1934/**
1935 * unregister_sysctl_table - unregister a sysctl table hierarchy
1936 * @header: the header returned from register_sysctl_table
1937 *
1938 * Unregisters the sysctl table and all children. proc entries may not
1939 * actually be removed until they are no longer used by anyone.
1940 */
1941void unregister_sysctl_table(struct ctl_table_header * header)
1942{
Al Viro330d57f2005-11-04 10:18:40 +00001943 might_sleep();
Pavel Emelyanovf1dad162007-12-04 23:45:24 -08001944
1945 if (header == NULL)
1946 return;
1947
Al Viro330d57f2005-11-04 10:18:40 +00001948 spin_lock(&sysctl_lock);
1949 start_unregistering(header);
Al Viroae7edec2008-07-15 06:33:31 -04001950 if (!--header->parent->count) {
1951 WARN_ON(1);
1952 kfree(header->parent);
1953 }
Al Virof7e6ced2008-07-15 01:44:23 -04001954 if (!--header->count)
1955 kfree(header);
Al Viro330d57f2005-11-04 10:18:40 +00001956 spin_unlock(&sysctl_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001957}
1958
Al Viro90434762008-07-15 08:54:06 -04001959int sysctl_is_seen(struct ctl_table_header *p)
1960{
1961 struct ctl_table_set *set = p->set;
1962 int res;
1963 spin_lock(&sysctl_lock);
1964 if (p->unregistering)
1965 res = 0;
1966 else if (!set->is_seen)
1967 res = 1;
1968 else
1969 res = set->is_seen(set);
1970 spin_unlock(&sysctl_lock);
1971 return res;
1972}
1973
Al Viro73455092008-07-14 21:22:20 -04001974void setup_sysctl_set(struct ctl_table_set *p,
1975 struct ctl_table_set *parent,
1976 int (*is_seen)(struct ctl_table_set *))
1977{
1978 INIT_LIST_HEAD(&p->list);
1979 p->parent = parent ? parent : &sysctl_table_root.default_set;
1980 p->is_seen = is_seen;
1981}
1982
Eric W. Biedermanb89a8172006-09-27 01:51:04 -07001983#else /* !CONFIG_SYSCTL */
Eric W. Biedermand8217f02007-10-18 03:05:22 -07001984struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
Eric W. Biedermanb89a8172006-09-27 01:51:04 -07001985{
1986 return NULL;
1987}
1988
Eric W. Biederman29e796f2007-11-30 23:50:18 +11001989struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1990 struct ctl_table *table)
1991{
1992 return NULL;
1993}
1994
Eric W. Biedermanb89a8172006-09-27 01:51:04 -07001995void unregister_sysctl_table(struct ctl_table_header * table)
1996{
1997}
1998
Al Viro73455092008-07-14 21:22:20 -04001999void setup_sysctl_set(struct ctl_table_set *p,
2000 struct ctl_table_set *parent,
2001 int (*is_seen)(struct ctl_table_set *))
2002{
2003}
2004
Al Virof7e6ced2008-07-15 01:44:23 -04002005void sysctl_head_put(struct ctl_table_header *head)
2006{
2007}
2008
Eric W. Biedermanb89a8172006-09-27 01:51:04 -07002009#endif /* CONFIG_SYSCTL */
2010
Linus Torvalds1da177e2005-04-16 15:20:36 -07002011/*
2012 * /proc/sys support
2013 */
2014
Eric W. Biedermanb89a8172006-09-27 01:51:04 -07002015#ifdef CONFIG_PROC_SYSCTL
Linus Torvalds1da177e2005-04-16 15:20:36 -07002016
Adrian Bunkb1ba4dd2006-10-02 02:18:05 -07002017static int _proc_do_string(void* data, int maxlen, int write,
Alexey Dobriyan8d65af72009-09-23 15:57:19 -07002018 void __user *buffer,
Adrian Bunkb1ba4dd2006-10-02 02:18:05 -07002019 size_t *lenp, loff_t *ppos)
Sam Vilainf5dd3d62006-10-02 02:18:04 -07002020{
2021 size_t len;
2022 char __user *p;
2023 char c;
Oleg Nesterov8d060872007-02-10 01:46:38 -08002024
2025 if (!data || !maxlen || !*lenp) {
Sam Vilainf5dd3d62006-10-02 02:18:04 -07002026 *lenp = 0;
2027 return 0;
2028 }
Oleg Nesterov8d060872007-02-10 01:46:38 -08002029
Sam Vilainf5dd3d62006-10-02 02:18:04 -07002030 if (write) {
2031 len = 0;
2032 p = buffer;
2033 while (len < *lenp) {
2034 if (get_user(c, p++))
2035 return -EFAULT;
2036 if (c == 0 || c == '\n')
2037 break;
2038 len++;
2039 }
2040 if (len >= maxlen)
2041 len = maxlen-1;
2042 if(copy_from_user(data, buffer, len))
2043 return -EFAULT;
2044 ((char *) data)[len] = 0;
2045 *ppos += *lenp;
2046 } else {
2047 len = strlen(data);
2048 if (len > maxlen)
2049 len = maxlen;
Oleg Nesterov8d060872007-02-10 01:46:38 -08002050
2051 if (*ppos > len) {
2052 *lenp = 0;
2053 return 0;
2054 }
2055
2056 data += *ppos;
2057 len -= *ppos;
2058
Sam Vilainf5dd3d62006-10-02 02:18:04 -07002059 if (len > *lenp)
2060 len = *lenp;
2061 if (len)
2062 if(copy_to_user(buffer, data, len))
2063 return -EFAULT;
2064 if (len < *lenp) {
2065 if(put_user('\n', ((char __user *) buffer) + len))
2066 return -EFAULT;
2067 len++;
2068 }
2069 *lenp = len;
2070 *ppos += len;
2071 }
2072 return 0;
2073}
2074
Linus Torvalds1da177e2005-04-16 15:20:36 -07002075/**
2076 * proc_dostring - read a string sysctl
2077 * @table: the sysctl table
2078 * @write: %TRUE if this is a write to the sysctl file
Linus Torvalds1da177e2005-04-16 15:20:36 -07002079 * @buffer: the user buffer
2080 * @lenp: the size of the user buffer
2081 * @ppos: file position
2082 *
2083 * Reads/writes a string from/to the user buffer. If the kernel
2084 * buffer provided is not large enough to hold the string, the
2085 * string is truncated. The copied string is %NULL-terminated.
2086 * If the string is being read by the user process, it is copied
2087 * and a newline '\n' is added. It is truncated if the buffer is
2088 * not large enough.
2089 *
2090 * Returns 0 on success.
2091 */
Alexey Dobriyan8d65af72009-09-23 15:57:19 -07002092int proc_dostring(struct ctl_table *table, int write,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002093 void __user *buffer, size_t *lenp, loff_t *ppos)
2094{
Alexey Dobriyan8d65af72009-09-23 15:57:19 -07002095 return _proc_do_string(table->data, table->maxlen, write,
Sam Vilainf5dd3d62006-10-02 02:18:04 -07002096 buffer, lenp, ppos);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002097}
2098
Amerigo Wang00b7c332010-05-05 00:26:45 +00002099static size_t proc_skip_spaces(char **buf)
2100{
2101 size_t ret;
2102 char *tmp = skip_spaces(*buf);
2103 ret = tmp - *buf;
2104 *buf = tmp;
2105 return ret;
2106}
Linus Torvalds1da177e2005-04-16 15:20:36 -07002107
Octavian Purdila9f977fb2010-05-05 00:26:55 +00002108static void proc_skip_char(char **buf, size_t *size, const char v)
2109{
2110 while (*size) {
2111 if (**buf != v)
2112 break;
2113 (*size)--;
2114 (*buf)++;
2115 }
2116}
2117
Amerigo Wang00b7c332010-05-05 00:26:45 +00002118#define TMPBUFLEN 22
2119/**
Randy Dunlap0fc377b2010-05-21 11:29:53 -07002120 * proc_get_long - reads an ASCII formatted integer from a user buffer
Amerigo Wang00b7c332010-05-05 00:26:45 +00002121 *
Randy Dunlap0fc377b2010-05-21 11:29:53 -07002122 * @buf: a kernel buffer
2123 * @size: size of the kernel buffer
2124 * @val: this is where the number will be stored
2125 * @neg: set to %TRUE if number is negative
2126 * @perm_tr: a vector which contains the allowed trailers
2127 * @perm_tr_len: size of the perm_tr vector
2128 * @tr: pointer to store the trailer character
Amerigo Wang00b7c332010-05-05 00:26:45 +00002129 *
Randy Dunlap0fc377b2010-05-21 11:29:53 -07002130 * In case of success %0 is returned and @buf and @size are updated with
2131 * the amount of bytes read. If @tr is non-NULL and a trailing
2132 * character exists (size is non-zero after returning from this
2133 * function), @tr is updated with the trailing character.
Amerigo Wang00b7c332010-05-05 00:26:45 +00002134 */
2135static int proc_get_long(char **buf, size_t *size,
2136 unsigned long *val, bool *neg,
2137 const char *perm_tr, unsigned perm_tr_len, char *tr)
2138{
2139 int len;
2140 char *p, tmp[TMPBUFLEN];
2141
2142 if (!*size)
2143 return -EINVAL;
2144
2145 len = *size;
2146 if (len > TMPBUFLEN - 1)
2147 len = TMPBUFLEN - 1;
2148
2149 memcpy(tmp, *buf, len);
2150
2151 tmp[len] = 0;
2152 p = tmp;
2153 if (*p == '-' && *size > 1) {
2154 *neg = true;
2155 p++;
2156 } else
2157 *neg = false;
2158 if (!isdigit(*p))
2159 return -EINVAL;
2160
2161 *val = simple_strtoul(p, &p, 0);
2162
2163 len = p - tmp;
2164
2165 /* We don't know if the next char is whitespace thus we may accept
2166 * invalid integers (e.g. 1234...a) or two integers instead of one
2167 * (e.g. 123...1). So lets not allow such large numbers. */
2168 if (len == TMPBUFLEN - 1)
2169 return -EINVAL;
2170
2171 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
2172 return -EINVAL;
2173
2174 if (tr && (len < *size))
2175 *tr = *p;
2176
2177 *buf += len;
2178 *size -= len;
2179
2180 return 0;
2181}
2182
2183/**
Randy Dunlap0fc377b2010-05-21 11:29:53 -07002184 * proc_put_long - converts an integer to a decimal ASCII formatted string
Amerigo Wang00b7c332010-05-05 00:26:45 +00002185 *
Randy Dunlap0fc377b2010-05-21 11:29:53 -07002186 * @buf: the user buffer
2187 * @size: the size of the user buffer
2188 * @val: the integer to be converted
2189 * @neg: sign of the number, %TRUE for negative
Amerigo Wang00b7c332010-05-05 00:26:45 +00002190 *
Randy Dunlap0fc377b2010-05-21 11:29:53 -07002191 * In case of success %0 is returned and @buf and @size are updated with
2192 * the amount of bytes written.
Amerigo Wang00b7c332010-05-05 00:26:45 +00002193 */
2194static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
2195 bool neg)
2196{
2197 int len;
2198 char tmp[TMPBUFLEN], *p = tmp;
2199
2200 sprintf(p, "%s%lu", neg ? "-" : "", val);
2201 len = strlen(tmp);
2202 if (len > *size)
2203 len = *size;
2204 if (copy_to_user(*buf, tmp, len))
2205 return -EFAULT;
2206 *size -= len;
2207 *buf += len;
2208 return 0;
2209}
2210#undef TMPBUFLEN
2211
2212static int proc_put_char(void __user **buf, size_t *size, char c)
2213{
2214 if (*size) {
2215 char __user **buffer = (char __user **)buf;
2216 if (put_user(c, *buffer))
2217 return -EFAULT;
2218 (*size)--, (*buffer)++;
2219 *buf = *buffer;
2220 }
2221 return 0;
2222}
2223
2224static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002225 int *valp,
2226 int write, void *data)
2227{
2228 if (write) {
2229 *valp = *negp ? -*lvalp : *lvalp;
2230 } else {
2231 int val = *valp;
2232 if (val < 0) {
Amerigo Wang00b7c332010-05-05 00:26:45 +00002233 *negp = true;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002234 *lvalp = (unsigned long)-val;
2235 } else {
Amerigo Wang00b7c332010-05-05 00:26:45 +00002236 *negp = false;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002237 *lvalp = (unsigned long)val;
2238 }
2239 }
2240 return 0;
2241}
2242
Amerigo Wang00b7c332010-05-05 00:26:45 +00002243static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
2244
Eric W. Biedermand8217f02007-10-18 03:05:22 -07002245static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
Alexey Dobriyan8d65af72009-09-23 15:57:19 -07002246 int write, void __user *buffer,
Kirill Korotaevfcfbd542006-10-02 02:18:23 -07002247 size_t *lenp, loff_t *ppos,
Amerigo Wang00b7c332010-05-05 00:26:45 +00002248 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002249 int write, void *data),
2250 void *data)
2251{
Amerigo Wang00b7c332010-05-05 00:26:45 +00002252 int *i, vleft, first = 1, err = 0;
2253 unsigned long page = 0;
2254 size_t left;
2255 char *kbuf;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002256
Amerigo Wang00b7c332010-05-05 00:26:45 +00002257 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002258 *lenp = 0;
2259 return 0;
2260 }
2261
Kirill Korotaevfcfbd542006-10-02 02:18:23 -07002262 i = (int *) tbl_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002263 vleft = table->maxlen / sizeof(*i);
2264 left = *lenp;
2265
2266 if (!conv)
2267 conv = do_proc_dointvec_conv;
2268
Linus Torvalds1da177e2005-04-16 15:20:36 -07002269 if (write) {
Amerigo Wang00b7c332010-05-05 00:26:45 +00002270 if (left > PAGE_SIZE - 1)
2271 left = PAGE_SIZE - 1;
2272 page = __get_free_page(GFP_TEMPORARY);
2273 kbuf = (char *) page;
2274 if (!kbuf)
2275 return -ENOMEM;
2276 if (copy_from_user(kbuf, buffer, left)) {
2277 err = -EFAULT;
2278 goto free;
2279 }
2280 kbuf[left] = 0;
2281 }
2282
2283 for (; left && vleft--; i++, first=0) {
2284 unsigned long lval;
2285 bool neg;
2286
2287 if (write) {
2288 left -= proc_skip_spaces(&kbuf);
2289
J. R. Okajima563b0462010-05-25 16:10:14 -07002290 if (!left)
2291 break;
Amerigo Wang00b7c332010-05-05 00:26:45 +00002292 err = proc_get_long(&kbuf, &left, &lval, &neg,
2293 proc_wspace_sep,
2294 sizeof(proc_wspace_sep), NULL);
2295 if (err)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002296 break;
Amerigo Wang00b7c332010-05-05 00:26:45 +00002297 if (conv(&neg, &lval, i, 1, data)) {
2298 err = -EINVAL;
2299 break;
2300 }
2301 } else {
2302 if (conv(&neg, &lval, i, 0, data)) {
2303 err = -EINVAL;
2304 break;
2305 }
2306 if (!first)
2307 err = proc_put_char(&buffer, &left, '\t');
2308 if (err)
2309 break;
2310 err = proc_put_long(&buffer, &left, lval, neg);
2311 if (err)
2312 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002313 }
2314 }
Amerigo Wang00b7c332010-05-05 00:26:45 +00002315
2316 if (!write && !first && left && !err)
2317 err = proc_put_char(&buffer, &left, '\n');
J. R. Okajima563b0462010-05-25 16:10:14 -07002318 if (write && !err && left)
Amerigo Wang00b7c332010-05-05 00:26:45 +00002319 left -= proc_skip_spaces(&kbuf);
2320free:
2321 if (write) {
2322 free_page(page);
2323 if (first)
2324 return err ? : -EINVAL;
2325 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002326 *lenp -= left;
2327 *ppos += *lenp;
Amerigo Wang00b7c332010-05-05 00:26:45 +00002328 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002329}
2330
Alexey Dobriyan8d65af72009-09-23 15:57:19 -07002331static int do_proc_dointvec(struct ctl_table *table, int write,
Kirill Korotaevfcfbd542006-10-02 02:18:23 -07002332 void __user *buffer, size_t *lenp, loff_t *ppos,
Amerigo Wang00b7c332010-05-05 00:26:45 +00002333 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
Kirill Korotaevfcfbd542006-10-02 02:18:23 -07002334 int write, void *data),
2335 void *data)
2336{
Alexey Dobriyan8d65af72009-09-23 15:57:19 -07002337 return __do_proc_dointvec(table->data, table, write,
Kirill Korotaevfcfbd542006-10-02 02:18:23 -07002338 buffer, lenp, ppos, conv, data);
2339}
2340
Linus Torvalds1da177e2005-04-16 15:20:36 -07002341/**
2342 * proc_dointvec - read a vector of integers
2343 * @table: the sysctl table
2344 * @write: %TRUE if this is a write to the sysctl file
Linus Torvalds1da177e2005-04-16 15:20:36 -07002345 * @buffer: the user buffer
2346 * @lenp: the size of the user buffer
2347 * @ppos: file position
2348 *
2349 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2350 * values from/to the user buffer, treated as an ASCII string.
2351 *
2352 * Returns 0 on success.
2353 */
Alexey Dobriyan8d65af72009-09-23 15:57:19 -07002354int proc_dointvec(struct ctl_table *table, int write,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002355 void __user *buffer, size_t *lenp, loff_t *ppos)
2356{
Alexey Dobriyan8d65af72009-09-23 15:57:19 -07002357 return do_proc_dointvec(table,write,buffer,lenp,ppos,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002358 NULL,NULL);
2359}
2360
Theodore Ts'o34f5a392007-02-10 01:45:24 -08002361/*
Andi Kleen25ddbb12008-10-15 22:01:41 -07002362 * Taint values can only be increased
2363 * This means we can safely use a temporary.
Theodore Ts'o34f5a392007-02-10 01:45:24 -08002364 */
Alexey Dobriyan8d65af72009-09-23 15:57:19 -07002365static int proc_taint(struct ctl_table *table, int write,
Theodore Ts'o34f5a392007-02-10 01:45:24 -08002366 void __user *buffer, size_t *lenp, loff_t *ppos)
2367{
Andi Kleen25ddbb12008-10-15 22:01:41 -07002368 struct ctl_table t;
2369 unsigned long tmptaint = get_taint();
2370 int err;
Theodore Ts'o34f5a392007-02-10 01:45:24 -08002371
Bastian Blank91fcd412007-04-23 14:41:14 -07002372 if (write && !capable(CAP_SYS_ADMIN))
Theodore Ts'o34f5a392007-02-10 01:45:24 -08002373 return -EPERM;
2374
Andi Kleen25ddbb12008-10-15 22:01:41 -07002375 t = *table;
2376 t.data = &tmptaint;
Alexey Dobriyan8d65af72009-09-23 15:57:19 -07002377 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
Andi Kleen25ddbb12008-10-15 22:01:41 -07002378 if (err < 0)
2379 return err;
2380
2381 if (write) {
2382 /*
2383 * Poor man's atomic or. Not worth adding a primitive
2384 * to everyone's atomic.h for this
2385 */
2386 int i;
2387 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2388 if ((tmptaint >> i) & 1)
2389 add_taint(i);
2390 }
2391 }
2392
2393 return err;
Theodore Ts'o34f5a392007-02-10 01:45:24 -08002394}
2395
Linus Torvalds1da177e2005-04-16 15:20:36 -07002396struct do_proc_dointvec_minmax_conv_param {
2397 int *min;
2398 int *max;
2399};
2400
Amerigo Wang00b7c332010-05-05 00:26:45 +00002401static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2402 int *valp,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002403 int write, void *data)
2404{
2405 struct do_proc_dointvec_minmax_conv_param *param = data;
2406 if (write) {
2407 int val = *negp ? -*lvalp : *lvalp;
2408 if ((param->min && *param->min > val) ||
2409 (param->max && *param->max < val))
2410 return -EINVAL;
2411 *valp = val;
2412 } else {
2413 int val = *valp;
2414 if (val < 0) {
Amerigo Wang00b7c332010-05-05 00:26:45 +00002415 *negp = true;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002416 *lvalp = (unsigned long)-val;
2417 } else {
Amerigo Wang00b7c332010-05-05 00:26:45 +00002418 *negp = false;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002419 *lvalp = (unsigned long)val;
2420 }
2421 }
2422 return 0;
2423}
2424
2425/**
2426 * proc_dointvec_minmax - read a vector of integers with min/max values
2427 * @table: the sysctl table
2428 * @write: %TRUE if this is a write to the sysctl file
Linus Torvalds1da177e2005-04-16 15:20:36 -07002429 * @buffer: the user buffer
2430 * @lenp: the size of the user buffer
2431 * @ppos: file position
2432 *
2433 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2434 * values from/to the user buffer, treated as an ASCII string.
2435 *
2436 * This routine will ensure the values are within the range specified by
2437 * table->extra1 (min) and table->extra2 (max).
2438 *
2439 * Returns 0 on success.
2440 */
Alexey Dobriyan8d65af72009-09-23 15:57:19 -07002441int proc_dointvec_minmax(struct ctl_table *table, int write,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002442 void __user *buffer, size_t *lenp, loff_t *ppos)
2443{
2444 struct do_proc_dointvec_minmax_conv_param param = {
2445 .min = (int *) table->extra1,
2446 .max = (int *) table->extra2,
2447 };
Alexey Dobriyan8d65af72009-09-23 15:57:19 -07002448 return do_proc_dointvec(table, write, buffer, lenp, ppos,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002449 do_proc_dointvec_minmax_conv, &param);
2450}
2451
Eric W. Biedermand8217f02007-10-18 03:05:22 -07002452static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002453 void __user *buffer,
2454 size_t *lenp, loff_t *ppos,
2455 unsigned long convmul,
2456 unsigned long convdiv)
2457{
Amerigo Wang00b7c332010-05-05 00:26:45 +00002458 unsigned long *i, *min, *max;
2459 int vleft, first = 1, err = 0;
2460 unsigned long page = 0;
2461 size_t left;
2462 char *kbuf;
2463
2464 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002465 *lenp = 0;
2466 return 0;
2467 }
Amerigo Wang00b7c332010-05-05 00:26:45 +00002468
Kirill Korotaevfcfbd542006-10-02 02:18:23 -07002469 i = (unsigned long *) data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002470 min = (unsigned long *) table->extra1;
2471 max = (unsigned long *) table->extra2;
2472 vleft = table->maxlen / sizeof(unsigned long);
2473 left = *lenp;
Amerigo Wang00b7c332010-05-05 00:26:45 +00002474
2475 if (write) {
2476 if (left > PAGE_SIZE - 1)
2477 left = PAGE_SIZE - 1;
2478 page = __get_free_page(GFP_TEMPORARY);
2479 kbuf = (char *) page;
2480 if (!kbuf)
2481 return -ENOMEM;
2482 if (copy_from_user(kbuf, buffer, left)) {
2483 err = -EFAULT;
2484 goto free;
2485 }
2486 kbuf[left] = 0;
2487 }
2488
Linus Torvalds1da177e2005-04-16 15:20:36 -07002489 for (; left && vleft--; i++, min++, max++, first=0) {
Amerigo Wang00b7c332010-05-05 00:26:45 +00002490 unsigned long val;
2491
Linus Torvalds1da177e2005-04-16 15:20:36 -07002492 if (write) {
Amerigo Wang00b7c332010-05-05 00:26:45 +00002493 bool neg;
2494
2495 left -= proc_skip_spaces(&kbuf);
2496
2497 err = proc_get_long(&kbuf, &left, &val, &neg,
2498 proc_wspace_sep,
2499 sizeof(proc_wspace_sep), NULL);
2500 if (err)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002501 break;
2502 if (neg)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002503 continue;
2504 if ((min && val < *min) || (max && val > *max))
2505 continue;
2506 *i = val;
2507 } else {
Amerigo Wang00b7c332010-05-05 00:26:45 +00002508 val = convdiv * (*i) / convmul;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002509 if (!first)
Amerigo Wang00b7c332010-05-05 00:26:45 +00002510 err = proc_put_char(&buffer, &left, '\t');
2511 err = proc_put_long(&buffer, &left, val, false);
2512 if (err)
2513 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002514 }
2515 }
2516
Amerigo Wang00b7c332010-05-05 00:26:45 +00002517 if (!write && !first && left && !err)
2518 err = proc_put_char(&buffer, &left, '\n');
2519 if (write && !err)
2520 left -= proc_skip_spaces(&kbuf);
2521free:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002522 if (write) {
Amerigo Wang00b7c332010-05-05 00:26:45 +00002523 free_page(page);
2524 if (first)
2525 return err ? : -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002526 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002527 *lenp -= left;
2528 *ppos += *lenp;
Amerigo Wang00b7c332010-05-05 00:26:45 +00002529 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002530}
2531
Eric W. Biedermand8217f02007-10-18 03:05:22 -07002532static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
Kirill Korotaevfcfbd542006-10-02 02:18:23 -07002533 void __user *buffer,
2534 size_t *lenp, loff_t *ppos,
2535 unsigned long convmul,
2536 unsigned long convdiv)
2537{
2538 return __do_proc_doulongvec_minmax(table->data, table, write,
Alexey Dobriyan8d65af72009-09-23 15:57:19 -07002539 buffer, lenp, ppos, convmul, convdiv);
Kirill Korotaevfcfbd542006-10-02 02:18:23 -07002540}
2541
Linus Torvalds1da177e2005-04-16 15:20:36 -07002542/**
2543 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2544 * @table: the sysctl table
2545 * @write: %TRUE if this is a write to the sysctl file
Linus Torvalds1da177e2005-04-16 15:20:36 -07002546 * @buffer: the user buffer
2547 * @lenp: the size of the user buffer
2548 * @ppos: file position
2549 *
2550 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2551 * values from/to the user buffer, treated as an ASCII string.
2552 *
2553 * This routine will ensure the values are within the range specified by
2554 * table->extra1 (min) and table->extra2 (max).
2555 *
2556 * Returns 0 on success.
2557 */
Alexey Dobriyan8d65af72009-09-23 15:57:19 -07002558int proc_doulongvec_minmax(struct ctl_table *table, int write,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002559 void __user *buffer, size_t *lenp, loff_t *ppos)
2560{
Alexey Dobriyan8d65af72009-09-23 15:57:19 -07002561 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002562}
2563
2564/**
2565 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2566 * @table: the sysctl table
2567 * @write: %TRUE if this is a write to the sysctl file
Linus Torvalds1da177e2005-04-16 15:20:36 -07002568 * @buffer: the user buffer
2569 * @lenp: the size of the user buffer
2570 * @ppos: file position
2571 *
2572 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2573 * values from/to the user buffer, treated as an ASCII string. The values
2574 * are treated as milliseconds, and converted to jiffies when they are stored.
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 */
Eric W. Biedermand8217f02007-10-18 03:05:22 -07002581int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002582 void __user *buffer,
2583 size_t *lenp, loff_t *ppos)
2584{
Alexey Dobriyan8d65af72009-09-23 15:57:19 -07002585 return do_proc_doulongvec_minmax(table, write, buffer,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002586 lenp, ppos, HZ, 1000l);
2587}
2588
2589
Amerigo Wang00b7c332010-05-05 00:26:45 +00002590static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002591 int *valp,
2592 int write, void *data)
2593{
2594 if (write) {
Bart Samwelcba9f332006-03-24 03:15:50 -08002595 if (*lvalp > LONG_MAX / HZ)
2596 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002597 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2598 } else {
2599 int val = *valp;
2600 unsigned long lval;
2601 if (val < 0) {
Amerigo Wang00b7c332010-05-05 00:26:45 +00002602 *negp = true;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002603 lval = (unsigned long)-val;
2604 } else {
Amerigo Wang00b7c332010-05-05 00:26:45 +00002605 *negp = false;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002606 lval = (unsigned long)val;
2607 }
2608 *lvalp = lval / HZ;
2609 }
2610 return 0;
2611}
2612
Amerigo Wang00b7c332010-05-05 00:26:45 +00002613static int do_proc_dointvec_userhz_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 (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2619 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002620 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
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 = jiffies_to_clock_t(lval);
2632 }
2633 return 0;
2634}
2635
Amerigo Wang00b7c332010-05-05 00:26:45 +00002636static int do_proc_dointvec_ms_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) {
2641 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2642 } else {
2643 int val = *valp;
2644 unsigned long lval;
2645 if (val < 0) {
Amerigo Wang00b7c332010-05-05 00:26:45 +00002646 *negp = true;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002647 lval = (unsigned long)-val;
2648 } else {
Amerigo Wang00b7c332010-05-05 00:26:45 +00002649 *negp = false;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002650 lval = (unsigned long)val;
2651 }
2652 *lvalp = jiffies_to_msecs(lval);
2653 }
2654 return 0;
2655}
2656
2657/**
2658 * proc_dointvec_jiffies - read a vector of integers as seconds
2659 * @table: the sysctl table
2660 * @write: %TRUE if this is a write to the sysctl file
Linus Torvalds1da177e2005-04-16 15:20:36 -07002661 * @buffer: the user buffer
2662 * @lenp: the size of the user buffer
2663 * @ppos: file position
2664 *
2665 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2666 * values from/to the user buffer, treated as an ASCII string.
2667 * The values read are assumed to be in seconds, and are converted into
2668 * jiffies.
2669 *
2670 * Returns 0 on success.
2671 */
Alexey Dobriyan8d65af72009-09-23 15:57:19 -07002672int proc_dointvec_jiffies(struct ctl_table *table, int write,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002673 void __user *buffer, size_t *lenp, loff_t *ppos)
2674{
Alexey Dobriyan8d65af72009-09-23 15:57:19 -07002675 return do_proc_dointvec(table,write,buffer,lenp,ppos,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002676 do_proc_dointvec_jiffies_conv,NULL);
2677}
2678
2679/**
2680 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2681 * @table: the sysctl table
2682 * @write: %TRUE if this is a write to the sysctl file
Linus Torvalds1da177e2005-04-16 15:20:36 -07002683 * @buffer: the user buffer
2684 * @lenp: the size of the user buffer
Randy Dunlap1e5d5332005-11-07 01:01:06 -08002685 * @ppos: pointer to the file position
Linus Torvalds1da177e2005-04-16 15:20:36 -07002686 *
2687 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2688 * values from/to the user buffer, treated as an ASCII string.
2689 * The values read are assumed to be in 1/USER_HZ seconds, and
2690 * are converted into jiffies.
2691 *
2692 * Returns 0 on success.
2693 */
Alexey Dobriyan8d65af72009-09-23 15:57:19 -07002694int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002695 void __user *buffer, size_t *lenp, loff_t *ppos)
2696{
Alexey Dobriyan8d65af72009-09-23 15:57:19 -07002697 return do_proc_dointvec(table,write,buffer,lenp,ppos,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002698 do_proc_dointvec_userhz_jiffies_conv,NULL);
2699}
2700
2701/**
2702 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2703 * @table: the sysctl table
2704 * @write: %TRUE if this is a write to the sysctl file
Linus Torvalds1da177e2005-04-16 15:20:36 -07002705 * @buffer: the user buffer
2706 * @lenp: the size of the user buffer
Martin Waitz67be2dd2005-05-01 08:59:26 -07002707 * @ppos: file position
2708 * @ppos: the current position in the file
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 1/1000 seconds, and
2713 * are converted into jiffies.
2714 *
2715 * Returns 0 on success.
2716 */
Alexey Dobriyan8d65af72009-09-23 15:57:19 -07002717int proc_dointvec_ms_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_ms_jiffies_conv, NULL);
2722}
2723
Alexey Dobriyan8d65af72009-09-23 15:57:19 -07002724static int proc_do_cad_pid(struct ctl_table *table, int write,
Cedric Le Goater9ec52092006-10-02 02:19:00 -07002725 void __user *buffer, size_t *lenp, loff_t *ppos)
2726{
2727 struct pid *new_pid;
2728 pid_t tmp;
2729 int r;
2730
Pavel Emelyanov6c5f3e72008-02-08 04:19:20 -08002731 tmp = pid_vnr(cad_pid);
Cedric Le Goater9ec52092006-10-02 02:19:00 -07002732
Alexey Dobriyan8d65af72009-09-23 15:57:19 -07002733 r = __do_proc_dointvec(&tmp, table, write, buffer,
Cedric Le Goater9ec52092006-10-02 02:19:00 -07002734 lenp, ppos, NULL, NULL);
2735 if (r || !write)
2736 return r;
2737
2738 new_pid = find_get_pid(tmp);
2739 if (!new_pid)
2740 return -ESRCH;
2741
2742 put_pid(xchg(&cad_pid, new_pid));
2743 return 0;
2744}
2745
Octavian Purdila9f977fb2010-05-05 00:26:55 +00002746/**
2747 * proc_do_large_bitmap - read/write from/to a large bitmap
2748 * @table: the sysctl table
2749 * @write: %TRUE if this is a write to the sysctl file
2750 * @buffer: the user buffer
2751 * @lenp: the size of the user buffer
2752 * @ppos: file position
2753 *
2754 * The bitmap is stored at table->data and the bitmap length (in bits)
2755 * in table->maxlen.
2756 *
2757 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2758 * large bitmaps may be represented in a compact manner. Writing into
2759 * the file will clear the bitmap then update it with the given input.
2760 *
2761 * Returns 0 on success.
2762 */
2763int proc_do_large_bitmap(struct ctl_table *table, int write,
2764 void __user *buffer, size_t *lenp, loff_t *ppos)
2765{
2766 int err = 0;
2767 bool first = 1;
2768 size_t left = *lenp;
2769 unsigned long bitmap_len = table->maxlen;
2770 unsigned long *bitmap = (unsigned long *) table->data;
2771 unsigned long *tmp_bitmap = NULL;
2772 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2773
2774 if (!bitmap_len || !left || (*ppos && !write)) {
2775 *lenp = 0;
2776 return 0;
2777 }
2778
2779 if (write) {
2780 unsigned long page = 0;
2781 char *kbuf;
2782
2783 if (left > PAGE_SIZE - 1)
2784 left = PAGE_SIZE - 1;
2785
2786 page = __get_free_page(GFP_TEMPORARY);
2787 kbuf = (char *) page;
2788 if (!kbuf)
2789 return -ENOMEM;
2790 if (copy_from_user(kbuf, buffer, left)) {
2791 free_page(page);
2792 return -EFAULT;
2793 }
2794 kbuf[left] = 0;
2795
2796 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
2797 GFP_KERNEL);
2798 if (!tmp_bitmap) {
2799 free_page(page);
2800 return -ENOMEM;
2801 }
2802 proc_skip_char(&kbuf, &left, '\n');
2803 while (!err && left) {
2804 unsigned long val_a, val_b;
2805 bool neg;
2806
2807 err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a,
2808 sizeof(tr_a), &c);
2809 if (err)
2810 break;
2811 if (val_a >= bitmap_len || neg) {
2812 err = -EINVAL;
2813 break;
2814 }
2815
2816 val_b = val_a;
2817 if (left) {
2818 kbuf++;
2819 left--;
2820 }
2821
2822 if (c == '-') {
2823 err = proc_get_long(&kbuf, &left, &val_b,
2824 &neg, tr_b, sizeof(tr_b),
2825 &c);
2826 if (err)
2827 break;
2828 if (val_b >= bitmap_len || neg ||
2829 val_a > val_b) {
2830 err = -EINVAL;
2831 break;
2832 }
2833 if (left) {
2834 kbuf++;
2835 left--;
2836 }
2837 }
2838
2839 while (val_a <= val_b)
2840 set_bit(val_a++, tmp_bitmap);
2841
2842 first = 0;
2843 proc_skip_char(&kbuf, &left, '\n');
2844 }
2845 free_page(page);
2846 } else {
2847 unsigned long bit_a, bit_b = 0;
2848
2849 while (left) {
2850 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
2851 if (bit_a >= bitmap_len)
2852 break;
2853 bit_b = find_next_zero_bit(bitmap, bitmap_len,
2854 bit_a + 1) - 1;
2855
2856 if (!first) {
2857 err = proc_put_char(&buffer, &left, ',');
2858 if (err)
2859 break;
2860 }
2861 err = proc_put_long(&buffer, &left, bit_a, false);
2862 if (err)
2863 break;
2864 if (bit_a != bit_b) {
2865 err = proc_put_char(&buffer, &left, '-');
2866 if (err)
2867 break;
2868 err = proc_put_long(&buffer, &left, bit_b, false);
2869 if (err)
2870 break;
2871 }
2872
2873 first = 0; bit_b++;
2874 }
2875 if (!err)
2876 err = proc_put_char(&buffer, &left, '\n');
2877 }
2878
2879 if (!err) {
2880 if (write) {
2881 if (*ppos)
2882 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
2883 else
2884 memcpy(bitmap, tmp_bitmap,
2885 BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long));
2886 }
2887 kfree(tmp_bitmap);
2888 *lenp -= left;
2889 *ppos += *lenp;
2890 return 0;
2891 } else {
2892 kfree(tmp_bitmap);
2893 return err;
2894 }
2895}
2896
Linus Torvalds1da177e2005-04-16 15:20:36 -07002897#else /* CONFIG_PROC_FS */
2898
Alexey Dobriyan8d65af72009-09-23 15:57:19 -07002899int proc_dostring(struct ctl_table *table, int write,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002900 void __user *buffer, size_t *lenp, loff_t *ppos)
2901{
2902 return -ENOSYS;
2903}
2904
Alexey Dobriyan8d65af72009-09-23 15:57:19 -07002905int proc_dointvec(struct ctl_table *table, int write,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002906 void __user *buffer, size_t *lenp, loff_t *ppos)
2907{
2908 return -ENOSYS;
2909}
2910
Alexey Dobriyan8d65af72009-09-23 15:57:19 -07002911int proc_dointvec_minmax(struct ctl_table *table, int write,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002912 void __user *buffer, size_t *lenp, loff_t *ppos)
2913{
2914 return -ENOSYS;
2915}
2916
Alexey Dobriyan8d65af72009-09-23 15:57:19 -07002917int proc_dointvec_jiffies(struct ctl_table *table, int write,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002918 void __user *buffer, size_t *lenp, loff_t *ppos)
2919{
2920 return -ENOSYS;
2921}
2922
Alexey Dobriyan8d65af72009-09-23 15:57:19 -07002923int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002924 void __user *buffer, size_t *lenp, loff_t *ppos)
2925{
2926 return -ENOSYS;
2927}
2928
Alexey Dobriyan8d65af72009-09-23 15:57:19 -07002929int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002930 void __user *buffer, size_t *lenp, loff_t *ppos)
2931{
2932 return -ENOSYS;
2933}
2934
Alexey Dobriyan8d65af72009-09-23 15:57:19 -07002935int proc_doulongvec_minmax(struct ctl_table *table, int write,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002936 void __user *buffer, size_t *lenp, loff_t *ppos)
2937{
2938 return -ENOSYS;
2939}
2940
Eric W. Biedermand8217f02007-10-18 03:05:22 -07002941int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002942 void __user *buffer,
2943 size_t *lenp, loff_t *ppos)
2944{
2945 return -ENOSYS;
2946}
2947
2948
2949#endif /* CONFIG_PROC_FS */
2950
Linus Torvalds1da177e2005-04-16 15:20:36 -07002951/*
2952 * No sense putting this after each symbol definition, twice,
2953 * exception granted :-)
2954 */
2955EXPORT_SYMBOL(proc_dointvec);
2956EXPORT_SYMBOL(proc_dointvec_jiffies);
2957EXPORT_SYMBOL(proc_dointvec_minmax);
2958EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2959EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2960EXPORT_SYMBOL(proc_dostring);
2961EXPORT_SYMBOL(proc_doulongvec_minmax);
2962EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
2963EXPORT_SYMBOL(register_sysctl_table);
Eric W. Biederman29e796f2007-11-30 23:50:18 +11002964EXPORT_SYMBOL(register_sysctl_paths);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002965EXPORT_SYMBOL(unregister_sysctl_table);