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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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070040#include <linux/hugetlb.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070041#include <linux/initrd.h>
David Howells0b77f5b2008-04-29 01:01:32 -070042#include <linux/key.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070043#include <linux/times.h>
44#include <linux/limits.h>
45#include <linux/dcache.h>
46#include <linux/syscalls.h>
Adrian Bunkc748e132008-07-23 21:27:03 -070047#include <linux/vmstat.h>
Pavel Machekc255d842006-02-20 18:27:58 -080048#include <linux/nfs_fs.h>
49#include <linux/acpi.h>
Jeremy Fitzhardinge10a0a8d2007-07-17 18:37:02 -070050#include <linux/reboot.h>
Steven Rostedtb0fc4942008-05-12 21:20:43 +020051#include <linux/ftrace.h>
David Howells12e22c52009-04-03 16:42:35 +010052#include <linux/slow-work.h>
Ingo Molnarcdd6c482009-09-21 12:02:48 +020053#include <linux/perf_event.h>
Masami Hiramatsub2be84d2010-02-25 08:34:15 -050054#include <linux/kprobes.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070055
56#include <asm/uaccess.h>
57#include <asm/processor.h>
58
Andi Kleen29cbc782006-09-30 01:47:55 +020059#ifdef CONFIG_X86
60#include <asm/nmi.h>
Chuck Ebbert0741f4d2006-12-07 02:14:11 +010061#include <asm/stacktrace.h>
Ingo Molnar6e7c4022008-01-30 13:30:05 +010062#include <asm/io.h>
Andi Kleen29cbc782006-09-30 01:47:55 +020063#endif
Dave Youngc55b7c32010-03-10 15:24:08 -080064#ifdef CONFIG_BSD_PROCESS_ACCT
65#include <linux/acct.h>
66#endif
Dave Young4f0e0562010-03-10 15:24:09 -080067#ifdef CONFIG_RT_MUTEXES
68#include <linux/rtmutex.h>
69#endif
Dave Young2edf5e42010-03-10 15:24:10 -080070#if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
71#include <linux/lockdep.h>
72#endif
Dave Young15485a42010-03-10 15:24:07 -080073#ifdef CONFIG_CHR_DEV_SG
74#include <scsi/sg.h>
75#endif
Andi Kleen29cbc782006-09-30 01:47:55 +020076
Eric W. Biederman7058cb02007-10-18 03:05:58 -070077
Linus Torvalds1da177e2005-04-16 15:20:36 -070078#if defined(CONFIG_SYSCTL)
79
80/* External variables not in a header file. */
Linus Torvalds1da177e2005-04-16 15:20:36 -070081extern int sysctl_overcommit_memory;
82extern int sysctl_overcommit_ratio;
KAMEZAWA Hiroyukifadd8fb2006-06-23 02:03:13 -070083extern int sysctl_panic_on_oom;
David Rientjesfe071d72007-10-16 23:25:56 -070084extern int sysctl_oom_kill_allocating_task;
David Rientjesfef1bdd2008-02-07 00:14:07 -080085extern int sysctl_oom_dump_tasks;
Linus Torvalds1da177e2005-04-16 15:20:36 -070086extern int max_threads;
Linus Torvalds1da177e2005-04-16 15:20:36 -070087extern int core_uses_pid;
Alan Coxd6e71142005-06-23 00:09:43 -070088extern int suid_dumpable;
Linus Torvalds1da177e2005-04-16 15:20:36 -070089extern char core_pattern[];
Neil Hormana2939802009-09-23 15:56:56 -070090extern unsigned int core_pipe_limit;
Linus Torvalds1da177e2005-04-16 15:20:36 -070091extern int pid_max;
92extern int min_free_kbytes;
Linus Torvalds1da177e2005-04-16 15:20:36 -070093extern int pid_max_min, pid_max_max;
Andrew Morton9d0243b2006-01-08 01:00:39 -080094extern int sysctl_drop_caches;
Rohit Seth8ad4b1f2006-01-08 01:00:40 -080095extern int percpu_pagelist_fraction;
Andi Kleenbebfa102006-06-26 13:56:52 +020096extern int compat_log;
Arjan van de Ven97455122008-01-25 21:08:34 +010097extern int latencytop_enabled;
Al Viroeceea0b2008-05-10 10:08:32 -040098extern int sysctl_nr_open_min, sysctl_nr_open_max;
Paul Mundtdd8632a2009-01-08 12:04:47 +000099#ifndef CONFIG_MMU
100extern int sysctl_nr_trim_pages;
101#endif
Jens Axboecb684b52009-09-15 21:53:11 +0200102#ifdef CONFIG_BLOCK
Jens Axboe5e605b62009-08-05 09:07:21 +0200103extern int blk_iopoll_enabled;
Jens Axboecb684b52009-09-15 21:53:11 +0200104#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105
Ravikiran G Thirumalaic4f3b632007-10-16 23:26:09 -0700106/* Constants used for minimum and maximum */
Bron Gondwana195cf4532008-02-04 22:29:20 -0800107#ifdef CONFIG_DETECT_SOFTLOCKUP
Ravikiran G Thirumalaic4f3b632007-10-16 23:26:09 -0700108static int sixty = 60;
Dimitri Sivanich9383d962008-05-12 21:21:14 +0200109static int neg_one = -1;
Ravikiran G Thirumalaic4f3b632007-10-16 23:26:09 -0700110#endif
111
Ravikiran G Thirumalaic4f3b632007-10-16 23:26:09 -0700112static int zero;
Linus Torvaldscd5f9a42009-04-06 13:38:46 -0700113static int __maybe_unused one = 1;
114static int __maybe_unused two = 2;
Sven Wegenerfc3501d2009-02-11 13:04:23 -0800115static unsigned long one_ul = 1;
Ravikiran G Thirumalaic4f3b632007-10-16 23:26:09 -0700116static int one_hundred = 100;
Dave Youngaf913222009-09-22 16:43:33 -0700117#ifdef CONFIG_PRINTK
118static int ten_thousand = 10000;
119#endif
Ravikiran G Thirumalaic4f3b632007-10-16 23:26:09 -0700120
Andrea Righi9e4a5bd2009-04-30 15:08:57 -0700121/* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
122static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
123
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124/* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
125static int maxolduid = 65535;
126static int minolduid;
Rohit Seth8ad4b1f2006-01-08 01:00:40 -0800127static int min_percpu_pagelist_fract = 8;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128
129static int ngroups_max = NGROUPS_MAX;
130
David S. Miller72c57ed2008-09-11 23:29:54 -0700131#ifdef CONFIG_SPARC
David S. Miller17f04fb2008-09-11 23:33:53 -0700132#include <asm/system.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133#endif
134
David S. Miller08714202008-11-16 23:49:24 -0800135#ifdef CONFIG_SPARC64
136extern int sysctl_tsb_ratio;
137#endif
138
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139#ifdef __hppa__
140extern int pwrsw_enabled;
141extern int unaligned_enabled;
142#endif
143
Martin Schwidefsky347a8dc2006-01-06 00:19:28 -0800144#ifdef CONFIG_S390
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145#ifdef CONFIG_MATHEMU
146extern int sysctl_ieee_emulation_warnings;
147#endif
148extern int sysctl_userprocess_debug;
Martin Schwidefsky951f22d2005-07-27 11:44:57 -0700149extern int spin_retry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150#endif
151
Jes Sorensend2b176e2006-02-28 09:42:23 -0800152#ifdef CONFIG_IA64
153extern int no_unaligned_warning;
Doug Chapman88fc2412009-01-15 10:38:56 -0800154extern int unaligned_dump_stack;
Jes Sorensend2b176e2006-02-28 09:42:23 -0800155#endif
156
Ingo Molnar3fff4c42009-09-22 16:18:09 +0200157extern struct ratelimit_state printk_ratelimit_state;
158
Randy Dunlapd6f8ff72006-10-19 23:28:34 -0700159#ifdef CONFIG_PROC_SYSCTL
Alexey Dobriyan8d65af72009-09-23 15:57:19 -0700160static int proc_do_cad_pid(struct ctl_table *table, int write,
Cedric Le Goater9ec52092006-10-02 02:19:00 -0700161 void __user *buffer, size_t *lenp, loff_t *ppos);
Alexey Dobriyan8d65af72009-09-23 15:57:19 -0700162static int proc_taint(struct ctl_table *table, int write,
Theodore Ts'o34f5a392007-02-10 01:45:24 -0800163 void __user *buffer, size_t *lenp, loff_t *ppos);
Randy Dunlapd6f8ff72006-10-19 23:28:34 -0700164#endif
Cedric Le Goater9ec52092006-10-02 02:19:00 -0700165
Dmitry Torokhov97f5f0c2010-03-21 22:31:26 -0700166#ifdef CONFIG_MAGIC_SYSRQ
167static int __sysrq_enabled; /* Note: sysrq code ises it's own private copy */
168
169static int sysrq_sysctl_handler(ctl_table *table, int write,
170 void __user *buffer, size_t *lenp,
171 loff_t *ppos)
172{
173 int error;
174
175 error = proc_dointvec(table, write, buffer, lenp, ppos);
176 if (error)
177 return error;
178
179 if (write)
180 sysrq_toggle_support(__sysrq_enabled);
181
182 return 0;
183}
184
185#endif
186
Eric W. Biedermand8217f02007-10-18 03:05:22 -0700187static struct ctl_table root_table[];
Eric W. Biedermane51b6ba2007-11-30 23:54:00 +1100188static struct ctl_table_root sysctl_table_root;
189static struct ctl_table_header root_table_header = {
Al Virob380b0d2008-09-04 17:05:57 +0100190 .count = 1,
Eric W. Biedermane51b6ba2007-11-30 23:54:00 +1100191 .ctl_table = root_table,
Al Viro73455092008-07-14 21:22:20 -0400192 .ctl_entry = LIST_HEAD_INIT(sysctl_table_root.default_set.list),
Eric W. Biedermane51b6ba2007-11-30 23:54:00 +1100193 .root = &sysctl_table_root,
Al Viro73455092008-07-14 21:22:20 -0400194 .set = &sysctl_table_root.default_set,
Eric W. Biedermane51b6ba2007-11-30 23:54:00 +1100195};
196static struct ctl_table_root sysctl_table_root = {
197 .root_list = LIST_HEAD_INIT(sysctl_table_root.root_list),
Al Viro73455092008-07-14 21:22:20 -0400198 .default_set.list = LIST_HEAD_INIT(root_table_header.ctl_entry),
Eric W. Biedermane51b6ba2007-11-30 23:54:00 +1100199};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200
Eric W. Biedermand8217f02007-10-18 03:05:22 -0700201static struct ctl_table kern_table[];
202static struct ctl_table vm_table[];
203static struct ctl_table fs_table[];
204static struct ctl_table debug_table[];
205static struct ctl_table dev_table[];
206extern struct ctl_table random_table[];
Amy Griffis2d9048e2006-06-01 13:10:59 -0700207#ifdef CONFIG_INOTIFY_USER
Eric W. Biedermand8217f02007-10-18 03:05:22 -0700208extern struct ctl_table inotify_table[];
Robert Love0399cb02005-07-13 12:38:18 -0400209#endif
Davide Libenzi7ef99642008-12-01 13:13:55 -0800210#ifdef CONFIG_EPOLL
211extern struct ctl_table epoll_table[];
212#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213
214#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
215int sysctl_legacy_va_layout;
216#endif
217
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218/* The default sysctl tables: */
219
Eric W. Biedermand8217f02007-10-18 03:05:22 -0700220static struct ctl_table root_table[] = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222 .procname = "kernel",
223 .mode = 0555,
224 .child = kern_table,
225 },
226 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227 .procname = "vm",
228 .mode = 0555,
229 .child = vm_table,
230 },
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232 .procname = "fs",
233 .mode = 0555,
234 .child = fs_table,
235 },
236 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237 .procname = "debug",
238 .mode = 0555,
239 .child = debug_table,
240 },
241 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242 .procname = "dev",
243 .mode = 0555,
244 .child = dev_table,
245 },
Andrew Morton2be7fe02007-07-15 23:41:21 -0700246/*
247 * NOTE: do not add new entries to this table unless you have read
248 * Documentation/sysctl/ctl_unnumbered.txt
249 */
Eric W. Biederman6fce56e2009-04-03 02:30:53 -0700250 { }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251};
252
Ingo Molnar77e54a12007-07-09 18:52:00 +0200253#ifdef CONFIG_SCHED_DEBUG
Eric Dumazet73c4efd2007-12-18 15:21:13 +0100254static int min_sched_granularity_ns = 100000; /* 100 usecs */
255static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
256static int min_wakeup_granularity_ns; /* 0 usecs */
257static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
Christian Ehrhardt1983a922009-11-30 12:16:47 +0100258static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
259static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
Christian Ehrhardtacb4a842009-11-30 12:16:48 +0100260static int min_sched_shares_ratelimit = 100000; /* 100 usec */
261static int max_sched_shares_ratelimit = NSEC_PER_SEC; /* 1 second */
Ingo Molnar77e54a12007-07-09 18:52:00 +0200262#endif
263
Eric W. Biedermand8217f02007-10-18 03:05:22 -0700264static struct ctl_table kern_table[] = {
Mike Galbraith2bba22c2009-09-09 15:41:37 +0200265 {
Mike Galbraith2bba22c2009-09-09 15:41:37 +0200266 .procname = "sched_child_runs_first",
267 .data = &sysctl_sched_child_runs_first,
268 .maxlen = sizeof(unsigned int),
269 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800270 .proc_handler = proc_dointvec,
Mike Galbraith2bba22c2009-09-09 15:41:37 +0200271 },
Ingo Molnar77e54a12007-07-09 18:52:00 +0200272#ifdef CONFIG_SCHED_DEBUG
273 {
Peter Zijlstrab2be5e92007-11-09 22:39:37 +0100274 .procname = "sched_min_granularity_ns",
275 .data = &sysctl_sched_min_granularity,
Ingo Molnar77e54a12007-07-09 18:52:00 +0200276 .maxlen = sizeof(unsigned int),
277 .mode = 0644,
Linus Torvalds702a7c72009-12-12 11:34:10 -0800278 .proc_handler = sched_proc_update_handler,
Peter Zijlstrab2be5e92007-11-09 22:39:37 +0100279 .extra1 = &min_sched_granularity_ns,
280 .extra2 = &max_sched_granularity_ns,
Ingo Molnar77e54a12007-07-09 18:52:00 +0200281 },
282 {
Peter Zijlstra21805082007-08-25 18:41:53 +0200283 .procname = "sched_latency_ns",
284 .data = &sysctl_sched_latency,
285 .maxlen = sizeof(unsigned int),
286 .mode = 0644,
Linus Torvalds702a7c72009-12-12 11:34:10 -0800287 .proc_handler = sched_proc_update_handler,
Peter Zijlstra21805082007-08-25 18:41:53 +0200288 .extra1 = &min_sched_granularity_ns,
289 .extra2 = &max_sched_granularity_ns,
290 },
291 {
Ingo Molnar77e54a12007-07-09 18:52:00 +0200292 .procname = "sched_wakeup_granularity_ns",
293 .data = &sysctl_sched_wakeup_granularity,
294 .maxlen = sizeof(unsigned int),
295 .mode = 0644,
Linus Torvalds702a7c72009-12-12 11:34:10 -0800296 .proc_handler = sched_proc_update_handler,
Ingo Molnar77e54a12007-07-09 18:52:00 +0200297 .extra1 = &min_wakeup_granularity_ns,
298 .extra2 = &max_wakeup_granularity_ns,
299 },
300 {
Peter Zijlstra2398f2c2008-06-27 13:41:35 +0200301 .procname = "sched_shares_ratelimit",
302 .data = &sysctl_sched_shares_ratelimit,
303 .maxlen = sizeof(unsigned int),
304 .mode = 0644,
Linus Torvalds702a7c72009-12-12 11:34:10 -0800305 .proc_handler = sched_proc_update_handler,
Christian Ehrhardtacb4a842009-11-30 12:16:48 +0100306 .extra1 = &min_sched_shares_ratelimit,
307 .extra2 = &max_sched_shares_ratelimit,
Peter Zijlstra2398f2c2008-06-27 13:41:35 +0200308 },
309 {
Christian Ehrhardt1983a922009-11-30 12:16:47 +0100310 .procname = "sched_tunable_scaling",
311 .data = &sysctl_sched_tunable_scaling,
312 .maxlen = sizeof(enum sched_tunable_scaling),
313 .mode = 0644,
Linus Torvalds702a7c72009-12-12 11:34:10 -0800314 .proc_handler = sched_proc_update_handler,
Christian Ehrhardt1983a922009-11-30 12:16:47 +0100315 .extra1 = &min_sched_tunable_scaling,
316 .extra2 = &max_sched_tunable_scaling,
Peter Zijlstra2398f2c2008-06-27 13:41:35 +0200317 },
318 {
Peter Zijlstraffda12a2008-10-17 19:27:02 +0200319 .procname = "sched_shares_thresh",
320 .data = &sysctl_sched_shares_thresh,
321 .maxlen = sizeof(unsigned int),
322 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800323 .proc_handler = proc_dointvec_minmax,
Peter Zijlstraffda12a2008-10-17 19:27:02 +0200324 .extra1 = &zero,
325 },
326 {
Ingo Molnarda84d962007-10-15 17:00:18 +0200327 .procname = "sched_migration_cost",
328 .data = &sysctl_sched_migration_cost,
329 .maxlen = sizeof(unsigned int),
330 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800331 .proc_handler = proc_dointvec,
Ingo Molnarda84d962007-10-15 17:00:18 +0200332 },
Peter Zijlstrab82d9fd2007-11-09 22:39:39 +0100333 {
Peter Zijlstrab82d9fd2007-11-09 22:39:39 +0100334 .procname = "sched_nr_migrate",
335 .data = &sysctl_sched_nr_migrate,
336 .maxlen = sizeof(unsigned int),
Peter Zijlstrafa85ae22008-01-25 21:08:29 +0100337 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800338 .proc_handler = proc_dointvec,
Peter Zijlstrafa85ae22008-01-25 21:08:29 +0100339 },
Arun R Bharadwajcd1bb942009-04-16 12:15:34 +0530340 {
Peter Zijlstrae9e92502009-09-01 10:34:37 +0200341 .procname = "sched_time_avg",
342 .data = &sysctl_sched_time_avg,
343 .maxlen = sizeof(unsigned int),
344 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800345 .proc_handler = proc_dointvec,
Peter Zijlstrae9e92502009-09-01 10:34:37 +0200346 },
347 {
Arun R Bharadwajcd1bb942009-04-16 12:15:34 +0530348 .procname = "timer_migration",
349 .data = &sysctl_timer_migration,
350 .maxlen = sizeof(unsigned int),
351 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800352 .proc_handler = proc_dointvec_minmax,
Arun R Bharadwajbfdb4d92009-06-23 10:00:58 +0530353 .extra1 = &zero,
354 .extra2 = &one,
Arun R Bharadwajcd1bb942009-04-16 12:15:34 +0530355 },
Peter Zijlstra1fc84aa2007-08-25 18:41:52 +0200356#endif
Ingo Molnar1799e352007-09-19 23:34:46 +0200357 {
Peter Zijlstra9f0c1e52008-02-13 15:45:39 +0100358 .procname = "sched_rt_period_us",
359 .data = &sysctl_sched_rt_period,
360 .maxlen = sizeof(unsigned int),
361 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800362 .proc_handler = sched_rt_handler,
Peter Zijlstra9f0c1e52008-02-13 15:45:39 +0100363 },
364 {
Peter Zijlstra9f0c1e52008-02-13 15:45:39 +0100365 .procname = "sched_rt_runtime_us",
366 .data = &sysctl_sched_rt_runtime,
367 .maxlen = sizeof(int),
368 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800369 .proc_handler = sched_rt_handler,
Peter Zijlstra9f0c1e52008-02-13 15:45:39 +0100370 },
371 {
Ingo Molnar1799e352007-09-19 23:34:46 +0200372 .procname = "sched_compat_yield",
373 .data = &sysctl_sched_compat_yield,
374 .maxlen = sizeof(unsigned int),
375 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800376 .proc_handler = proc_dointvec,
Ingo Molnar1799e352007-09-19 23:34:46 +0200377 },
Peter Zijlstraf20786f2007-07-19 01:48:56 -0700378#ifdef CONFIG_PROVE_LOCKING
379 {
Peter Zijlstraf20786f2007-07-19 01:48:56 -0700380 .procname = "prove_locking",
381 .data = &prove_locking,
382 .maxlen = sizeof(int),
383 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800384 .proc_handler = proc_dointvec,
Peter Zijlstraf20786f2007-07-19 01:48:56 -0700385 },
386#endif
387#ifdef CONFIG_LOCK_STAT
388 {
Peter Zijlstraf20786f2007-07-19 01:48:56 -0700389 .procname = "lock_stat",
390 .data = &lock_stat,
391 .maxlen = sizeof(int),
392 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800393 .proc_handler = proc_dointvec,
Peter Zijlstraf20786f2007-07-19 01:48:56 -0700394 },
395#endif
Ingo Molnar77e54a12007-07-09 18:52:00 +0200396 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397 .procname = "panic",
398 .data = &panic_timeout,
399 .maxlen = sizeof(int),
400 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800401 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402 },
403 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700404 .procname = "core_uses_pid",
405 .data = &core_uses_pid,
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_pattern",
412 .data = core_pattern,
Dan Aloni71ce92f2007-05-16 22:11:16 -0700413 .maxlen = CORENAME_MAX_SIZE,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800415 .proc_handler = proc_dostring,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700416 },
Neil Hormana2939802009-09-23 15:56:56 -0700417 {
Neil Hormana2939802009-09-23 15:56:56 -0700418 .procname = "core_pipe_limit",
419 .data = &core_pipe_limit,
420 .maxlen = sizeof(unsigned int),
421 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800422 .proc_handler = proc_dointvec,
Neil Hormana2939802009-09-23 15:56:56 -0700423 },
Theodore Ts'o34f5a392007-02-10 01:45:24 -0800424#ifdef CONFIG_PROC_SYSCTL
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426 .procname = "tainted",
Andi Kleen25ddbb12008-10-15 22:01:41 -0700427 .maxlen = sizeof(long),
Theodore Ts'o34f5a392007-02-10 01:45:24 -0800428 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800429 .proc_handler = proc_taint,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430 },
Theodore Ts'o34f5a392007-02-10 01:45:24 -0800431#endif
Arjan van de Ven97455122008-01-25 21:08:34 +0100432#ifdef CONFIG_LATENCYTOP
433 {
434 .procname = "latencytop",
435 .data = &latencytop_enabled,
436 .maxlen = sizeof(int),
437 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800438 .proc_handler = proc_dointvec,
Arjan van de Ven97455122008-01-25 21:08:34 +0100439 },
440#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441#ifdef CONFIG_BLK_DEV_INITRD
442 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443 .procname = "real-root-dev",
444 .data = &real_root_dev,
445 .maxlen = sizeof(int),
446 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800447 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448 },
449#endif
Ingo Molnar45807a12007-07-15 23:40:10 -0700450 {
Ingo Molnar45807a12007-07-15 23:40:10 -0700451 .procname = "print-fatal-signals",
452 .data = &print_fatal_signals,
453 .maxlen = sizeof(int),
454 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800455 .proc_handler = proc_dointvec,
Ingo Molnar45807a12007-07-15 23:40:10 -0700456 },
David S. Miller72c57ed2008-09-11 23:29:54 -0700457#ifdef CONFIG_SPARC
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459 .procname = "reboot-cmd",
460 .data = reboot_command,
461 .maxlen = 256,
462 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800463 .proc_handler = proc_dostring,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464 },
465 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700466 .procname = "stop-a",
467 .data = &stop_a_enabled,
468 .maxlen = sizeof (int),
469 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800470 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471 },
472 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700473 .procname = "scons-poweroff",
474 .data = &scons_pwroff,
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#endif
David S. Miller08714202008-11-16 23:49:24 -0800480#ifdef CONFIG_SPARC64
481 {
David S. Miller08714202008-11-16 23:49:24 -0800482 .procname = "tsb-ratio",
483 .data = &sysctl_tsb_ratio,
484 .maxlen = sizeof (int),
485 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800486 .proc_handler = proc_dointvec,
David S. Miller08714202008-11-16 23:49:24 -0800487 },
488#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700489#ifdef __hppa__
490 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700491 .procname = "soft-power",
492 .data = &pwrsw_enabled,
493 .maxlen = sizeof (int),
494 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800495 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496 },
497 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700498 .procname = "unaligned-trap",
499 .data = &unaligned_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#endif
505 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506 .procname = "ctrl-alt-del",
507 .data = &C_A_D,
508 .maxlen = sizeof(int),
509 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800510 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700511 },
Steven Rostedt606576c2008-10-06 19:06:12 -0400512#ifdef CONFIG_FUNCTION_TRACER
Steven Rostedtb0fc4942008-05-12 21:20:43 +0200513 {
Steven Rostedtb0fc4942008-05-12 21:20:43 +0200514 .procname = "ftrace_enabled",
515 .data = &ftrace_enabled,
516 .maxlen = sizeof(int),
517 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800518 .proc_handler = ftrace_enable_sysctl,
Steven Rostedtb0fc4942008-05-12 21:20:43 +0200519 },
520#endif
Steven Rostedtf38f1d22008-12-16 23:06:40 -0500521#ifdef CONFIG_STACK_TRACER
522 {
Steven Rostedtf38f1d22008-12-16 23:06:40 -0500523 .procname = "stack_tracer_enabled",
524 .data = &stack_tracer_enabled,
525 .maxlen = sizeof(int),
526 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800527 .proc_handler = stack_trace_sysctl,
Steven Rostedtf38f1d22008-12-16 23:06:40 -0500528 },
529#endif
Steven Rostedt944ac422008-10-23 19:26:08 -0400530#ifdef CONFIG_TRACING
531 {
Peter Zijlstra3299b4d2008-11-04 11:58:21 +0100532 .procname = "ftrace_dump_on_oops",
Steven Rostedt944ac422008-10-23 19:26:08 -0400533 .data = &ftrace_dump_on_oops,
534 .maxlen = sizeof(int),
535 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800536 .proc_handler = proc_dointvec,
Steven Rostedt944ac422008-10-23 19:26:08 -0400537 },
538#endif
Johannes Berga1ef5ad2008-07-08 19:00:17 +0200539#ifdef CONFIG_MODULES
Linus Torvalds1da177e2005-04-16 15:20:36 -0700540 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541 .procname = "modprobe",
542 .data = &modprobe_path,
543 .maxlen = KMOD_PATH_LEN,
544 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800545 .proc_handler = proc_dostring,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700546 },
Kees Cook3d433212009-04-02 15:49:29 -0700547 {
Kees Cook3d433212009-04-02 15:49:29 -0700548 .procname = "modules_disabled",
549 .data = &modules_disabled,
550 .maxlen = sizeof(int),
551 .mode = 0644,
552 /* only handle a transition from default "0" to "1" */
Eric W. Biederman6d456112009-11-16 03:11:48 -0800553 .proc_handler = proc_dointvec_minmax,
Kees Cook3d433212009-04-02 15:49:29 -0700554 .extra1 = &one,
555 .extra2 = &one,
556 },
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557#endif
Andrew Morton57ae2502006-06-23 02:05:47 -0700558#if defined(CONFIG_HOTPLUG) && defined(CONFIG_NET)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700559 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560 .procname = "hotplug",
Kay Sievers312c0042005-11-16 09:00:00 +0100561 .data = &uevent_helper,
562 .maxlen = UEVENT_HELPER_PATH_LEN,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700563 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800564 .proc_handler = proc_dostring,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565 },
566#endif
567#ifdef CONFIG_CHR_DEV_SG
568 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700569 .procname = "sg-big-buff",
570 .data = &sg_big_buff,
571 .maxlen = sizeof (int),
572 .mode = 0444,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800573 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574 },
575#endif
576#ifdef CONFIG_BSD_PROCESS_ACCT
577 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700578 .procname = "acct",
579 .data = &acct_parm,
580 .maxlen = 3*sizeof(int),
581 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800582 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700583 },
584#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700585#ifdef CONFIG_MAGIC_SYSRQ
586 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700587 .procname = "sysrq",
Ingo Molnar5d6f6472006-12-13 00:34:36 -0800588 .data = &__sysrq_enabled,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700589 .maxlen = sizeof (int),
590 .mode = 0644,
Dmitry Torokhov97f5f0c2010-03-21 22:31:26 -0700591 .proc_handler = sysrq_sysctl_handler,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700592 },
593#endif
Randy Dunlapd6f8ff72006-10-19 23:28:34 -0700594#ifdef CONFIG_PROC_SYSCTL
Linus Torvalds1da177e2005-04-16 15:20:36 -0700595 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700596 .procname = "cad_pid",
Cedric Le Goater9ec52092006-10-02 02:19:00 -0700597 .data = NULL,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700598 .maxlen = sizeof (int),
599 .mode = 0600,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800600 .proc_handler = proc_do_cad_pid,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700601 },
Randy Dunlapd6f8ff72006-10-19 23:28:34 -0700602#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700603 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700604 .procname = "threads-max",
605 .data = &max_threads,
606 .maxlen = sizeof(int),
607 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800608 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700609 },
610 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700611 .procname = "random",
612 .mode = 0555,
613 .child = random_table,
614 },
Linus Torvalds1da177e2005-04-16 15:20:36 -0700615 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700616 .procname = "overflowuid",
617 .data = &overflowuid,
618 .maxlen = sizeof(int),
619 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800620 .proc_handler = proc_dointvec_minmax,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700621 .extra1 = &minolduid,
622 .extra2 = &maxolduid,
623 },
624 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700625 .procname = "overflowgid",
626 .data = &overflowgid,
627 .maxlen = sizeof(int),
628 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800629 .proc_handler = proc_dointvec_minmax,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700630 .extra1 = &minolduid,
631 .extra2 = &maxolduid,
632 },
Martin Schwidefsky347a8dc2006-01-06 00:19:28 -0800633#ifdef CONFIG_S390
Linus Torvalds1da177e2005-04-16 15:20:36 -0700634#ifdef CONFIG_MATHEMU
635 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700636 .procname = "ieee_emulation_warnings",
637 .data = &sysctl_ieee_emulation_warnings,
638 .maxlen = sizeof(int),
639 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800640 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700641 },
642#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700643 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700644 .procname = "userprocess_debug",
Heiko Carstensab3c68e2010-05-17 10:00:21 +0200645 .data = &show_unhandled_signals,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700646 .maxlen = sizeof(int),
647 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800648 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700649 },
650#endif
651 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700652 .procname = "pid_max",
653 .data = &pid_max,
654 .maxlen = sizeof (int),
655 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800656 .proc_handler = proc_dointvec_minmax,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700657 .extra1 = &pid_max_min,
658 .extra2 = &pid_max_max,
659 },
660 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700661 .procname = "panic_on_oops",
662 .data = &panic_on_oops,
663 .maxlen = sizeof(int),
664 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800665 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700666 },
Joe Perches7ef3d2f2008-02-08 04:21:25 -0800667#if defined CONFIG_PRINTK
668 {
Joe Perches7ef3d2f2008-02-08 04:21:25 -0800669 .procname = "printk",
670 .data = &console_loglevel,
671 .maxlen = 4*sizeof(int),
672 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800673 .proc_handler = proc_dointvec,
Joe Perches7ef3d2f2008-02-08 04:21:25 -0800674 },
Linus Torvalds1da177e2005-04-16 15:20:36 -0700675 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700676 .procname = "printk_ratelimit",
Dave Young717115e2008-07-25 01:45:58 -0700677 .data = &printk_ratelimit_state.interval,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700678 .maxlen = sizeof(int),
679 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800680 .proc_handler = proc_dointvec_jiffies,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700681 },
682 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700683 .procname = "printk_ratelimit_burst",
Dave Young717115e2008-07-25 01:45:58 -0700684 .data = &printk_ratelimit_state.burst,
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,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700688 },
Dave Youngaf913222009-09-22 16:43:33 -0700689 {
Dave Youngaf913222009-09-22 16:43:33 -0700690 .procname = "printk_delay",
691 .data = &printk_delay_msec,
692 .maxlen = sizeof(int),
693 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800694 .proc_handler = proc_dointvec_minmax,
Dave Youngaf913222009-09-22 16:43:33 -0700695 .extra1 = &zero,
696 .extra2 = &ten_thousand,
697 },
Joe Perches7ef3d2f2008-02-08 04:21:25 -0800698#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700699 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700700 .procname = "ngroups_max",
701 .data = &ngroups_max,
702 .maxlen = sizeof (int),
703 .mode = 0444,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800704 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700705 },
706#if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
707 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700708 .procname = "unknown_nmi_panic",
709 .data = &unknown_nmi_panic,
710 .maxlen = sizeof (int),
711 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800712 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700713 },
Don Zickus407984f2006-09-26 10:52:27 +0200714 {
Don Zickus407984f2006-09-26 10:52:27 +0200715 .procname = "nmi_watchdog",
716 .data = &nmi_watchdog_enabled,
717 .maxlen = sizeof (int),
718 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800719 .proc_handler = proc_nmi_enabled,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700720 },
721#endif
722#if defined(CONFIG_X86)
723 {
Don Zickus8da5add2006-09-26 10:52:27 +0200724 .procname = "panic_on_unrecovered_nmi",
725 .data = &panic_on_unrecovered_nmi,
726 .maxlen = sizeof(int),
727 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800728 .proc_handler = proc_dointvec,
Don Zickus8da5add2006-09-26 10:52:27 +0200729 },
730 {
Kurt Garloff5211a242009-06-24 14:32:11 -0700731 .procname = "panic_on_io_nmi",
732 .data = &panic_on_io_nmi,
733 .maxlen = sizeof(int),
734 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800735 .proc_handler = proc_dointvec,
Kurt Garloff5211a242009-06-24 14:32:11 -0700736 },
737 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700738 .procname = "bootloader_type",
739 .data = &bootloader_type,
740 .maxlen = sizeof (int),
741 .mode = 0444,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800742 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700743 },
Chuck Ebbert0741f4d2006-12-07 02:14:11 +0100744 {
H. Peter Anvin50312962009-05-07 16:54:11 -0700745 .procname = "bootloader_version",
746 .data = &bootloader_version,
747 .maxlen = sizeof (int),
748 .mode = 0444,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800749 .proc_handler = proc_dointvec,
H. Peter Anvin50312962009-05-07 16:54:11 -0700750 },
751 {
Chuck Ebbert0741f4d2006-12-07 02:14:11 +0100752 .procname = "kstack_depth_to_print",
753 .data = &kstack_depth_to_print,
754 .maxlen = sizeof(int),
755 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800756 .proc_handler = proc_dointvec,
Chuck Ebbert0741f4d2006-12-07 02:14:11 +0100757 },
Ingo Molnar6e7c4022008-01-30 13:30:05 +0100758 {
Ingo Molnar6e7c4022008-01-30 13:30:05 +0100759 .procname = "io_delay_type",
760 .data = &io_delay_type,
761 .maxlen = sizeof(int),
762 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800763 .proc_handler = proc_dointvec,
Ingo Molnar6e7c4022008-01-30 13:30:05 +0100764 },
Linus Torvalds1da177e2005-04-16 15:20:36 -0700765#endif
Luke Yang7a9166e2006-02-20 18:28:07 -0800766#if defined(CONFIG_MMU)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700767 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700768 .procname = "randomize_va_space",
769 .data = &randomize_va_space,
770 .maxlen = sizeof(int),
771 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800772 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700773 },
Luke Yang7a9166e2006-02-20 18:28:07 -0800774#endif
Martin Schwidefsky0152fb32006-01-14 13:21:00 -0800775#if defined(CONFIG_S390) && defined(CONFIG_SMP)
Martin Schwidefsky951f22d2005-07-27 11:44:57 -0700776 {
Martin Schwidefsky951f22d2005-07-27 11:44:57 -0700777 .procname = "spin_retry",
778 .data = &spin_retry,
779 .maxlen = sizeof (int),
780 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800781 .proc_handler = proc_dointvec,
Martin Schwidefsky951f22d2005-07-27 11:44:57 -0700782 },
783#endif
Len Brown673d5b42007-07-28 03:33:16 -0400784#if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
Pavel Machekc255d842006-02-20 18:27:58 -0800785 {
Pavel Machekc255d842006-02-20 18:27:58 -0800786 .procname = "acpi_video_flags",
Pavel Machek77afcf72007-07-19 01:47:41 -0700787 .data = &acpi_realmode_flags,
Pavel Machekc255d842006-02-20 18:27:58 -0800788 .maxlen = sizeof (unsigned long),
789 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800790 .proc_handler = proc_doulongvec_minmax,
Pavel Machekc255d842006-02-20 18:27:58 -0800791 },
792#endif
Jes Sorensend2b176e2006-02-28 09:42:23 -0800793#ifdef CONFIG_IA64
794 {
Jes Sorensend2b176e2006-02-28 09:42:23 -0800795 .procname = "ignore-unaligned-usertrap",
796 .data = &no_unaligned_warning,
797 .maxlen = sizeof (int),
798 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800799 .proc_handler = proc_dointvec,
Jes Sorensend2b176e2006-02-28 09:42:23 -0800800 },
Doug Chapman88fc2412009-01-15 10:38:56 -0800801 {
Doug Chapman88fc2412009-01-15 10:38:56 -0800802 .procname = "unaligned-dump-stack",
803 .data = &unaligned_dump_stack,
804 .maxlen = sizeof (int),
805 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800806 .proc_handler = proc_dointvec,
Doug Chapman88fc2412009-01-15 10:38:56 -0800807 },
Jes Sorensend2b176e2006-02-28 09:42:23 -0800808#endif
Ravikiran G Thirumalaic4f3b632007-10-16 23:26:09 -0700809#ifdef CONFIG_DETECT_SOFTLOCKUP
810 {
Ingo Molnar9c44bc02008-05-12 21:21:04 +0200811 .procname = "softlockup_panic",
812 .data = &softlockup_panic,
813 .maxlen = sizeof(int),
814 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800815 .proc_handler = proc_dointvec_minmax,
Ingo Molnar9c44bc02008-05-12 21:21:04 +0200816 .extra1 = &zero,
817 .extra2 = &one,
818 },
819 {
Ravikiran G Thirumalaic4f3b632007-10-16 23:26:09 -0700820 .procname = "softlockup_thresh",
821 .data = &softlockup_thresh,
Dimitri Sivanich9383d962008-05-12 21:21:14 +0200822 .maxlen = sizeof(int),
Ravikiran G Thirumalaic4f3b632007-10-16 23:26:09 -0700823 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800824 .proc_handler = proc_dosoftlockup_thresh,
Dimitri Sivanich9383d962008-05-12 21:21:14 +0200825 .extra1 = &neg_one,
Ravikiran G Thirumalaic4f3b632007-10-16 23:26:09 -0700826 .extra2 = &sixty,
827 },
Mandeep Singh Bainese162b392009-01-15 11:08:40 -0800828#endif
829#ifdef CONFIG_DETECT_HUNG_TASK
830 {
Mandeep Singh Bainese162b392009-01-15 11:08:40 -0800831 .procname = "hung_task_panic",
832 .data = &sysctl_hung_task_panic,
833 .maxlen = sizeof(int),
834 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800835 .proc_handler = proc_dointvec_minmax,
Mandeep Singh Bainese162b392009-01-15 11:08:40 -0800836 .extra1 = &zero,
837 .extra2 = &one,
838 },
Ingo Molnar82a1fcb2008-01-25 21:08:02 +0100839 {
Ingo Molnar82a1fcb2008-01-25 21:08:02 +0100840 .procname = "hung_task_check_count",
841 .data = &sysctl_hung_task_check_count,
Ingo Molnar90739082008-01-25 21:08:34 +0100842 .maxlen = sizeof(unsigned long),
Ingo Molnar82a1fcb2008-01-25 21:08:02 +0100843 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800844 .proc_handler = proc_doulongvec_minmax,
Ingo Molnar82a1fcb2008-01-25 21:08:02 +0100845 },
846 {
Ingo Molnar82a1fcb2008-01-25 21:08:02 +0100847 .procname = "hung_task_timeout_secs",
848 .data = &sysctl_hung_task_timeout_secs,
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_dohung_task_timeout_secs,
Ingo Molnar82a1fcb2008-01-25 21:08:02 +0100852 },
853 {
Ingo Molnar82a1fcb2008-01-25 21:08:02 +0100854 .procname = "hung_task_warnings",
855 .data = &sysctl_hung_task_warnings,
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_doulongvec_minmax,
Ingo Molnar82a1fcb2008-01-25 21:08:02 +0100859 },
Ravikiran G Thirumalaic4f3b632007-10-16 23:26:09 -0700860#endif
Andi Kleenbebfa102006-06-26 13:56:52 +0200861#ifdef CONFIG_COMPAT
862 {
Andi Kleenbebfa102006-06-26 13:56:52 +0200863 .procname = "compat-log",
864 .data = &compat_log,
865 .maxlen = sizeof (int),
866 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800867 .proc_handler = proc_dointvec,
Andi Kleenbebfa102006-06-26 13:56:52 +0200868 },
869#endif
Ingo Molnar23f78d4a2006-06-27 02:54:53 -0700870#ifdef CONFIG_RT_MUTEXES
871 {
Ingo Molnar23f78d4a2006-06-27 02:54:53 -0700872 .procname = "max_lock_depth",
873 .data = &max_lock_depth,
874 .maxlen = sizeof(int),
875 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800876 .proc_handler = proc_dointvec,
Ingo Molnar23f78d4a2006-06-27 02:54:53 -0700877 },
878#endif
Jeremy Fitzhardinge10a0a8d2007-07-17 18:37:02 -0700879 {
Jeremy Fitzhardinge10a0a8d2007-07-17 18:37:02 -0700880 .procname = "poweroff_cmd",
881 .data = &poweroff_cmd,
882 .maxlen = POWEROFF_CMD_PATH_LEN,
883 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800884 .proc_handler = proc_dostring,
Jeremy Fitzhardinge10a0a8d2007-07-17 18:37:02 -0700885 },
David Howells0b77f5b2008-04-29 01:01:32 -0700886#ifdef CONFIG_KEYS
887 {
David Howells0b77f5b2008-04-29 01:01:32 -0700888 .procname = "keys",
889 .mode = 0555,
890 .child = key_sysctls,
891 },
892#endif
Paul E. McKenney31a72bc2008-06-18 09:26:49 -0700893#ifdef CONFIG_RCU_TORTURE_TEST
894 {
Paul E. McKenney31a72bc2008-06-18 09:26:49 -0700895 .procname = "rcutorture_runnable",
896 .data = &rcutorture_runnable,
897 .maxlen = sizeof(int),
898 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800899 .proc_handler = proc_dointvec,
Paul E. McKenney31a72bc2008-06-18 09:26:49 -0700900 },
901#endif
David Howells12e22c52009-04-03 16:42:35 +0100902#ifdef CONFIG_SLOW_WORK
903 {
David Howells12e22c52009-04-03 16:42:35 +0100904 .procname = "slow-work",
905 .mode = 0555,
906 .child = slow_work_sysctls,
907 },
908#endif
Ingo Molnarcdd6c482009-09-21 12:02:48 +0200909#ifdef CONFIG_PERF_EVENTS
Peter Zijlstra1ccd1542009-04-09 10:53:45 +0200910 {
Ingo Molnarcdd6c482009-09-21 12:02:48 +0200911 .procname = "perf_event_paranoid",
912 .data = &sysctl_perf_event_paranoid,
913 .maxlen = sizeof(sysctl_perf_event_paranoid),
Peter Zijlstra1ccd1542009-04-09 10:53:45 +0200914 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800915 .proc_handler = proc_dointvec,
Peter Zijlstra1ccd1542009-04-09 10:53:45 +0200916 },
Peter Zijlstrac5078f72009-05-05 17:50:24 +0200917 {
Ingo Molnarcdd6c482009-09-21 12:02:48 +0200918 .procname = "perf_event_mlock_kb",
919 .data = &sysctl_perf_event_mlock,
920 .maxlen = sizeof(sysctl_perf_event_mlock),
Peter Zijlstrac5078f72009-05-05 17:50:24 +0200921 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800922 .proc_handler = proc_dointvec,
Peter Zijlstrac5078f72009-05-05 17:50:24 +0200923 },
Peter Zijlstraa78ac322009-05-25 17:39:05 +0200924 {
Ingo Molnarcdd6c482009-09-21 12:02:48 +0200925 .procname = "perf_event_max_sample_rate",
926 .data = &sysctl_perf_event_sample_rate,
927 .maxlen = sizeof(sysctl_perf_event_sample_rate),
Peter Zijlstraa78ac322009-05-25 17:39:05 +0200928 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800929 .proc_handler = proc_dointvec,
Peter Zijlstraa78ac322009-05-25 17:39:05 +0200930 },
Peter Zijlstra1ccd1542009-04-09 10:53:45 +0200931#endif
Vegard Nossumdfec0722008-04-04 00:51:41 +0200932#ifdef CONFIG_KMEMCHECK
933 {
Vegard Nossumdfec0722008-04-04 00:51:41 +0200934 .procname = "kmemcheck",
935 .data = &kmemcheck_enabled,
936 .maxlen = sizeof(int),
937 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800938 .proc_handler = proc_dointvec,
Vegard Nossumdfec0722008-04-04 00:51:41 +0200939 },
940#endif
Jens Axboecb684b52009-09-15 21:53:11 +0200941#ifdef CONFIG_BLOCK
Jens Axboe5e605b62009-08-05 09:07:21 +0200942 {
Jens Axboe5e605b62009-08-05 09:07:21 +0200943 .procname = "blk_iopoll",
944 .data = &blk_iopoll_enabled,
945 .maxlen = sizeof(int),
946 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800947 .proc_handler = proc_dointvec,
Jens Axboe5e605b62009-08-05 09:07:21 +0200948 },
Jens Axboecb684b52009-09-15 21:53:11 +0200949#endif
Andrew Mortoned2c12f2007-07-19 01:50:35 -0700950/*
951 * NOTE: do not add new entries to this table unless you have read
952 * Documentation/sysctl/ctl_unnumbered.txt
953 */
Eric W. Biederman6fce56e2009-04-03 02:30:53 -0700954 { }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700955};
956
Eric W. Biedermand8217f02007-10-18 03:05:22 -0700957static struct ctl_table vm_table[] = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700958 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700959 .procname = "overcommit_memory",
960 .data = &sysctl_overcommit_memory,
961 .maxlen = sizeof(sysctl_overcommit_memory),
962 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800963 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700964 },
965 {
KAMEZAWA Hiroyukifadd8fb2006-06-23 02:03:13 -0700966 .procname = "panic_on_oom",
967 .data = &sysctl_panic_on_oom,
968 .maxlen = sizeof(sysctl_panic_on_oom),
969 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800970 .proc_handler = proc_dointvec,
KAMEZAWA Hiroyukifadd8fb2006-06-23 02:03:13 -0700971 },
972 {
David Rientjesfe071d72007-10-16 23:25:56 -0700973 .procname = "oom_kill_allocating_task",
974 .data = &sysctl_oom_kill_allocating_task,
975 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
976 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800977 .proc_handler = proc_dointvec,
David Rientjesfe071d72007-10-16 23:25:56 -0700978 },
979 {
David Rientjesfef1bdd2008-02-07 00:14:07 -0800980 .procname = "oom_dump_tasks",
981 .data = &sysctl_oom_dump_tasks,
982 .maxlen = sizeof(sysctl_oom_dump_tasks),
983 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800984 .proc_handler = proc_dointvec,
David Rientjesfef1bdd2008-02-07 00:14:07 -0800985 },
986 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700987 .procname = "overcommit_ratio",
988 .data = &sysctl_overcommit_ratio,
989 .maxlen = sizeof(sysctl_overcommit_ratio),
990 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -0800991 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700992 },
993 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700994 .procname = "page-cluster",
995 .data = &page_cluster,
996 .maxlen = sizeof(int),
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 = "dirty_background_ratio",
1002 .data = &dirty_background_ratio,
1003 .maxlen = sizeof(dirty_background_ratio),
1004 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001005 .proc_handler = dirty_background_ratio_handler,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001006 .extra1 = &zero,
1007 .extra2 = &one_hundred,
1008 },
1009 {
David Rientjes2da02992009-01-06 14:39:31 -08001010 .procname = "dirty_background_bytes",
1011 .data = &dirty_background_bytes,
1012 .maxlen = sizeof(dirty_background_bytes),
1013 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001014 .proc_handler = dirty_background_bytes_handler,
Sven Wegenerfc3501d2009-02-11 13:04:23 -08001015 .extra1 = &one_ul,
David Rientjes2da02992009-01-06 14:39:31 -08001016 },
1017 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001018 .procname = "dirty_ratio",
1019 .data = &vm_dirty_ratio,
1020 .maxlen = sizeof(vm_dirty_ratio),
1021 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001022 .proc_handler = dirty_ratio_handler,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001023 .extra1 = &zero,
1024 .extra2 = &one_hundred,
1025 },
1026 {
David Rientjes2da02992009-01-06 14:39:31 -08001027 .procname = "dirty_bytes",
1028 .data = &vm_dirty_bytes,
1029 .maxlen = sizeof(vm_dirty_bytes),
1030 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001031 .proc_handler = dirty_bytes_handler,
Andrea Righi9e4a5bd2009-04-30 15:08:57 -07001032 .extra1 = &dirty_bytes_min,
David Rientjes2da02992009-01-06 14:39:31 -08001033 },
1034 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001035 .procname = "dirty_writeback_centisecs",
Bart Samwelf6ef9432006-03-24 03:15:48 -08001036 .data = &dirty_writeback_interval,
1037 .maxlen = sizeof(dirty_writeback_interval),
Linus Torvalds1da177e2005-04-16 15:20:36 -07001038 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001039 .proc_handler = dirty_writeback_centisecs_handler,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001040 },
1041 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001042 .procname = "dirty_expire_centisecs",
Bart Samwelf6ef9432006-03-24 03:15:48 -08001043 .data = &dirty_expire_interval,
1044 .maxlen = sizeof(dirty_expire_interval),
Linus Torvalds1da177e2005-04-16 15:20:36 -07001045 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001046 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001047 },
1048 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001049 .procname = "nr_pdflush_threads",
1050 .data = &nr_pdflush_threads,
1051 .maxlen = sizeof nr_pdflush_threads,
1052 .mode = 0444 /* read-only*/,
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 = "swappiness",
1057 .data = &vm_swappiness,
1058 .maxlen = sizeof(vm_swappiness),
1059 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001060 .proc_handler = proc_dointvec_minmax,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001061 .extra1 = &zero,
1062 .extra2 = &one_hundred,
1063 },
1064#ifdef CONFIG_HUGETLB_PAGE
Lee Schermerhorn06808b02009-12-14 17:58:21 -08001065 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001066 .procname = "nr_hugepages",
Andi Kleene5ff2152008-07-23 21:27:42 -07001067 .data = NULL,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001068 .maxlen = sizeof(unsigned long),
1069 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001070 .proc_handler = hugetlb_sysctl_handler,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001071 .extra1 = (void *)&hugetlb_zero,
1072 .extra2 = (void *)&hugetlb_infinity,
Lee Schermerhorn06808b02009-12-14 17:58:21 -08001073 },
1074#ifdef CONFIG_NUMA
1075 {
1076 .procname = "nr_hugepages_mempolicy",
1077 .data = NULL,
1078 .maxlen = sizeof(unsigned long),
1079 .mode = 0644,
1080 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
1081 .extra1 = (void *)&hugetlb_zero,
1082 .extra2 = (void *)&hugetlb_infinity,
1083 },
1084#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001085 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001086 .procname = "hugetlb_shm_group",
1087 .data = &sysctl_hugetlb_shm_group,
1088 .maxlen = sizeof(gid_t),
1089 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001090 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001091 },
Mel Gorman396faf02007-07-17 04:03:13 -07001092 {
Mel Gorman396faf02007-07-17 04:03:13 -07001093 .procname = "hugepages_treat_as_movable",
1094 .data = &hugepages_treat_as_movable,
1095 .maxlen = sizeof(int),
1096 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001097 .proc_handler = hugetlb_treat_movable_handler,
Mel Gorman396faf02007-07-17 04:03:13 -07001098 },
Adam Litke54f9f802007-10-16 01:26:20 -07001099 {
Nishanth Aravamudand1c3fb12007-12-17 16:20:12 -08001100 .procname = "nr_overcommit_hugepages",
Andi Kleene5ff2152008-07-23 21:27:42 -07001101 .data = NULL,
1102 .maxlen = sizeof(unsigned long),
Nishanth Aravamudand1c3fb12007-12-17 16:20:12 -08001103 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001104 .proc_handler = hugetlb_overcommit_handler,
Andi Kleene5ff2152008-07-23 21:27:42 -07001105 .extra1 = (void *)&hugetlb_zero,
1106 .extra2 = (void *)&hugetlb_infinity,
Nishanth Aravamudand1c3fb12007-12-17 16:20:12 -08001107 },
Linus Torvalds1da177e2005-04-16 15:20:36 -07001108#endif
1109 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001110 .procname = "lowmem_reserve_ratio",
1111 .data = &sysctl_lowmem_reserve_ratio,
1112 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1113 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001114 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001115 },
1116 {
Andrew Morton9d0243b2006-01-08 01:00:39 -08001117 .procname = "drop_caches",
1118 .data = &sysctl_drop_caches,
1119 .maxlen = sizeof(int),
1120 .mode = 0644,
1121 .proc_handler = drop_caches_sysctl_handler,
Andrew Morton9d0243b2006-01-08 01:00:39 -08001122 },
1123 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001124 .procname = "min_free_kbytes",
1125 .data = &min_free_kbytes,
1126 .maxlen = sizeof(min_free_kbytes),
1127 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001128 .proc_handler = min_free_kbytes_sysctl_handler,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001129 .extra1 = &zero,
1130 },
Rohit Seth8ad4b1f2006-01-08 01:00:40 -08001131 {
Rohit Seth8ad4b1f2006-01-08 01:00:40 -08001132 .procname = "percpu_pagelist_fraction",
1133 .data = &percpu_pagelist_fraction,
1134 .maxlen = sizeof(percpu_pagelist_fraction),
1135 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001136 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
Rohit Seth8ad4b1f2006-01-08 01:00:40 -08001137 .extra1 = &min_percpu_pagelist_fract,
1138 },
Linus Torvalds1da177e2005-04-16 15:20:36 -07001139#ifdef CONFIG_MMU
1140 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001141 .procname = "max_map_count",
1142 .data = &sysctl_max_map_count,
1143 .maxlen = sizeof(sysctl_max_map_count),
1144 .mode = 0644,
WANG Cong3e261202009-12-17 15:27:05 -08001145 .proc_handler = proc_dointvec_minmax,
Amerigo Wang70da2342009-12-14 17:59:52 -08001146 .extra1 = &zero,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001147 },
Paul Mundtdd8632a2009-01-08 12:04:47 +00001148#else
1149 {
Paul Mundtdd8632a2009-01-08 12:04:47 +00001150 .procname = "nr_trim_pages",
1151 .data = &sysctl_nr_trim_pages,
1152 .maxlen = sizeof(sysctl_nr_trim_pages),
1153 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001154 .proc_handler = proc_dointvec_minmax,
Paul Mundtdd8632a2009-01-08 12:04:47 +00001155 .extra1 = &zero,
1156 },
Linus Torvalds1da177e2005-04-16 15:20:36 -07001157#endif
1158 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001159 .procname = "laptop_mode",
1160 .data = &laptop_mode,
1161 .maxlen = sizeof(laptop_mode),
1162 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001163 .proc_handler = proc_dointvec_jiffies,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001164 },
1165 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001166 .procname = "block_dump",
1167 .data = &block_dump,
1168 .maxlen = sizeof(block_dump),
1169 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001170 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001171 .extra1 = &zero,
1172 },
1173 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001174 .procname = "vfs_cache_pressure",
1175 .data = &sysctl_vfs_cache_pressure,
1176 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1177 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001178 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001179 .extra1 = &zero,
1180 },
1181#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1182 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001183 .procname = "legacy_va_layout",
1184 .data = &sysctl_legacy_va_layout,
1185 .maxlen = sizeof(sysctl_legacy_va_layout),
1186 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001187 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001188 .extra1 = &zero,
1189 },
1190#endif
Christoph Lameter17436602006-01-18 17:42:32 -08001191#ifdef CONFIG_NUMA
1192 {
Christoph Lameter17436602006-01-18 17:42:32 -08001193 .procname = "zone_reclaim_mode",
1194 .data = &zone_reclaim_mode,
1195 .maxlen = sizeof(zone_reclaim_mode),
1196 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001197 .proc_handler = proc_dointvec,
Christoph Lameterc84db232006-02-01 03:05:29 -08001198 .extra1 = &zero,
Christoph Lameter17436602006-01-18 17:42:32 -08001199 },
Christoph Lameter96146342006-07-03 00:24:13 -07001200 {
Christoph Lameter96146342006-07-03 00:24:13 -07001201 .procname = "min_unmapped_ratio",
1202 .data = &sysctl_min_unmapped_ratio,
1203 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1204 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001205 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
Christoph Lameter96146342006-07-03 00:24:13 -07001206 .extra1 = &zero,
1207 .extra2 = &one_hundred,
1208 },
Christoph Lameter0ff38492006-09-25 23:31:52 -07001209 {
Christoph Lameter0ff38492006-09-25 23:31:52 -07001210 .procname = "min_slab_ratio",
1211 .data = &sysctl_min_slab_ratio,
1212 .maxlen = sizeof(sysctl_min_slab_ratio),
1213 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001214 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
Christoph Lameter0ff38492006-09-25 23:31:52 -07001215 .extra1 = &zero,
1216 .extra2 = &one_hundred,
1217 },
Christoph Lameter17436602006-01-18 17:42:32 -08001218#endif
Christoph Lameter77461ab2007-05-09 02:35:13 -07001219#ifdef CONFIG_SMP
1220 {
Christoph Lameter77461ab2007-05-09 02:35:13 -07001221 .procname = "stat_interval",
1222 .data = &sysctl_stat_interval,
1223 .maxlen = sizeof(sysctl_stat_interval),
1224 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001225 .proc_handler = proc_dointvec_jiffies,
Christoph Lameter77461ab2007-05-09 02:35:13 -07001226 },
1227#endif
David Howells6e141542009-12-15 19:27:45 +00001228#ifdef CONFIG_MMU
Eric Parised032182007-06-28 15:55:21 -04001229 {
Eric Parised032182007-06-28 15:55:21 -04001230 .procname = "mmap_min_addr",
Eric Paris788084a2009-07-31 12:54:11 -04001231 .data = &dac_mmap_min_addr,
1232 .maxlen = sizeof(unsigned long),
Eric Parised032182007-06-28 15:55:21 -04001233 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001234 .proc_handler = mmap_min_addr_handler,
Eric Parised032182007-06-28 15:55:21 -04001235 },
David Howells6e141542009-12-15 19:27:45 +00001236#endif
KAMEZAWA Hiroyukif0c0b2b2007-07-15 23:38:01 -07001237#ifdef CONFIG_NUMA
1238 {
KAMEZAWA Hiroyukif0c0b2b2007-07-15 23:38:01 -07001239 .procname = "numa_zonelist_order",
1240 .data = &numa_zonelist_order,
1241 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1242 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001243 .proc_handler = numa_zonelist_order_handler,
KAMEZAWA Hiroyukif0c0b2b2007-07-15 23:38:01 -07001244 },
1245#endif
Al Viro2b8232c2007-10-13 08:16:04 +01001246#if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
Paul Mundt5c36e652007-03-01 10:07:42 +09001247 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
Ingo Molnare6e54942006-06-27 02:53:50 -07001248 {
Ingo Molnare6e54942006-06-27 02:53:50 -07001249 .procname = "vdso_enabled",
1250 .data = &vdso_enabled,
1251 .maxlen = sizeof(vdso_enabled),
1252 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001253 .proc_handler = proc_dointvec,
Ingo Molnare6e54942006-06-27 02:53:50 -07001254 .extra1 = &zero,
1255 },
1256#endif
Bron Gondwana195cf4532008-02-04 22:29:20 -08001257#ifdef CONFIG_HIGHMEM
1258 {
Bron Gondwana195cf4532008-02-04 22:29:20 -08001259 .procname = "highmem_is_dirtyable",
1260 .data = &vm_highmem_is_dirtyable,
1261 .maxlen = sizeof(vm_highmem_is_dirtyable),
1262 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001263 .proc_handler = proc_dointvec_minmax,
Bron Gondwana195cf4532008-02-04 22:29:20 -08001264 .extra1 = &zero,
1265 .extra2 = &one,
1266 },
1267#endif
Peter Zijlstra4be6f6b2009-04-13 14:39:33 -07001268 {
Peter Zijlstra4be6f6b2009-04-13 14:39:33 -07001269 .procname = "scan_unevictable_pages",
1270 .data = &scan_unevictable_pages,
1271 .maxlen = sizeof(scan_unevictable_pages),
1272 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001273 .proc_handler = scan_unevictable_handler,
Peter Zijlstra4be6f6b2009-04-13 14:39:33 -07001274 },
Andi Kleen6a460792009-09-16 11:50:15 +02001275#ifdef CONFIG_MEMORY_FAILURE
1276 {
Andi Kleen6a460792009-09-16 11:50:15 +02001277 .procname = "memory_failure_early_kill",
1278 .data = &sysctl_memory_failure_early_kill,
1279 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1280 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001281 .proc_handler = proc_dointvec_minmax,
Andi Kleen6a460792009-09-16 11:50:15 +02001282 .extra1 = &zero,
1283 .extra2 = &one,
1284 },
1285 {
Andi Kleen6a460792009-09-16 11:50:15 +02001286 .procname = "memory_failure_recovery",
1287 .data = &sysctl_memory_failure_recovery,
1288 .maxlen = sizeof(sysctl_memory_failure_recovery),
1289 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001290 .proc_handler = proc_dointvec_minmax,
Andi Kleen6a460792009-09-16 11:50:15 +02001291 .extra1 = &zero,
1292 .extra2 = &one,
1293 },
1294#endif
1295
Andrew Morton2be7fe02007-07-15 23:41:21 -07001296/*
1297 * NOTE: do not add new entries to this table unless you have read
1298 * Documentation/sysctl/ctl_unnumbered.txt
1299 */
Eric W. Biederman6fce56e2009-04-03 02:30:53 -07001300 { }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001301};
1302
Eric W. Biederman2abc26f2007-02-14 00:34:07 -08001303#if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
Eric W. Biedermand8217f02007-10-18 03:05:22 -07001304static struct ctl_table binfmt_misc_table[] = {
Eric W. Biederman6fce56e2009-04-03 02:30:53 -07001305 { }
Eric W. Biederman2abc26f2007-02-14 00:34:07 -08001306};
1307#endif
1308
Eric W. Biedermand8217f02007-10-18 03:05:22 -07001309static struct ctl_table fs_table[] = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001310 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001311 .procname = "inode-nr",
1312 .data = &inodes_stat,
1313 .maxlen = 2*sizeof(int),
1314 .mode = 0444,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001315 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001316 },
1317 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001318 .procname = "inode-state",
1319 .data = &inodes_stat,
1320 .maxlen = 7*sizeof(int),
1321 .mode = 0444,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001322 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001323 },
1324 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001325 .procname = "file-nr",
1326 .data = &files_stat,
1327 .maxlen = 3*sizeof(int),
1328 .mode = 0444,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001329 .proc_handler = proc_nr_files,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001330 },
1331 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001332 .procname = "file-max",
1333 .data = &files_stat.max_files,
1334 .maxlen = sizeof(int),
1335 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001336 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001337 },
1338 {
Eric Dumazet9cfe0152008-02-06 01:37:16 -08001339 .procname = "nr_open",
1340 .data = &sysctl_nr_open,
1341 .maxlen = sizeof(int),
1342 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001343 .proc_handler = proc_dointvec_minmax,
Al Viroeceea0b2008-05-10 10:08:32 -04001344 .extra1 = &sysctl_nr_open_min,
1345 .extra2 = &sysctl_nr_open_max,
Eric Dumazet9cfe0152008-02-06 01:37:16 -08001346 },
1347 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001348 .procname = "dentry-state",
1349 .data = &dentry_stat,
1350 .maxlen = 6*sizeof(int),
1351 .mode = 0444,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001352 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001353 },
1354 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001355 .procname = "overflowuid",
1356 .data = &fs_overflowuid,
1357 .maxlen = sizeof(int),
1358 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001359 .proc_handler = proc_dointvec_minmax,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001360 .extra1 = &minolduid,
1361 .extra2 = &maxolduid,
1362 },
1363 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001364 .procname = "overflowgid",
1365 .data = &fs_overflowgid,
1366 .maxlen = sizeof(int),
1367 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001368 .proc_handler = proc_dointvec_minmax,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001369 .extra1 = &minolduid,
1370 .extra2 = &maxolduid,
1371 },
Thomas Petazzonibfcd17a2008-08-06 15:12:22 +02001372#ifdef CONFIG_FILE_LOCKING
Linus Torvalds1da177e2005-04-16 15:20:36 -07001373 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001374 .procname = "leases-enable",
1375 .data = &leases_enable,
1376 .maxlen = sizeof(int),
1377 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001378 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001379 },
Thomas Petazzonibfcd17a2008-08-06 15:12:22 +02001380#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001381#ifdef CONFIG_DNOTIFY
1382 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001383 .procname = "dir-notify-enable",
1384 .data = &dir_notify_enable,
1385 .maxlen = sizeof(int),
1386 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001387 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001388 },
1389#endif
1390#ifdef CONFIG_MMU
Thomas Petazzonibfcd17a2008-08-06 15:12:22 +02001391#ifdef CONFIG_FILE_LOCKING
Linus Torvalds1da177e2005-04-16 15:20:36 -07001392 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001393 .procname = "lease-break-time",
1394 .data = &lease_break_time,
1395 .maxlen = sizeof(int),
1396 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001397 .proc_handler = proc_dointvec,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001398 },
Thomas Petazzonibfcd17a2008-08-06 15:12:22 +02001399#endif
Thomas Petazzoniebf3f092008-10-15 22:05:12 -07001400#ifdef CONFIG_AIO
Linus Torvalds1da177e2005-04-16 15:20:36 -07001401 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001402 .procname = "aio-nr",
1403 .data = &aio_nr,
1404 .maxlen = sizeof(aio_nr),
1405 .mode = 0444,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001406 .proc_handler = proc_doulongvec_minmax,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001407 },
1408 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001409 .procname = "aio-max-nr",
1410 .data = &aio_max_nr,
1411 .maxlen = sizeof(aio_max_nr),
1412 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001413 .proc_handler = proc_doulongvec_minmax,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001414 },
Thomas Petazzoniebf3f092008-10-15 22:05:12 -07001415#endif /* CONFIG_AIO */
Amy Griffis2d9048e2006-06-01 13:10:59 -07001416#ifdef CONFIG_INOTIFY_USER
Robert Love0399cb02005-07-13 12:38:18 -04001417 {
Robert Love0399cb02005-07-13 12:38:18 -04001418 .procname = "inotify",
1419 .mode = 0555,
1420 .child = inotify_table,
1421 },
1422#endif
Davide Libenzi7ef99642008-12-01 13:13:55 -08001423#ifdef CONFIG_EPOLL
1424 {
1425 .procname = "epoll",
1426 .mode = 0555,
1427 .child = epoll_table,
1428 },
1429#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001430#endif
Alan Coxd6e71142005-06-23 00:09:43 -07001431 {
Alan Coxd6e71142005-06-23 00:09:43 -07001432 .procname = "suid_dumpable",
1433 .data = &suid_dumpable,
1434 .maxlen = sizeof(int),
1435 .mode = 0644,
Eric W. Biederman6d456112009-11-16 03:11:48 -08001436 .proc_handler = proc_dointvec_minmax,
Matthew Wilcox8e654fb2009-04-02 16:58:33 -07001437 .extra1 = &zero,
1438 .extra2 = &two,
Alan Coxd6e71142005-06-23 00:09:43 -07001439 },
Eric W. Biederman2abc26f2007-02-14 00:34:07 -08001440#if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1441 {
Eric W. Biederman2abc26f2007-02-14 00:34:07 -08001442 .procname = "binfmt_misc",
1443 .mode = 0555,
1444 .child = binfmt_misc_table,
1445 },
1446#endif
Andrew Morton2be7fe02007-07-15 23:41:21 -07001447/*
1448 * NOTE: do not add new entries to this table unless you have read
1449 * Documentation/sysctl/ctl_unnumbered.txt
1450 */
Eric W. Biederman6fce56e2009-04-03 02:30:53 -07001451 { }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001452};
1453
Eric W. Biedermand8217f02007-10-18 03:05:22 -07001454static struct ctl_table debug_table[] = {
Heiko Carstensab3c68e2010-05-17 10:00:21 +02001455#if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_SPARC) || \
1456 defined(CONFIG_S390)
Masoud Asgharifard Sharbianiabd4f752007-07-22 11:12:28 +02001457 {
Masoud Asgharifard Sharbianiabd4f752007-07-22 11:12:28 +02001458 .procname = "exception-trace",
1459 .data = &show_unhandled_signals,
1460 .maxlen = sizeof(int),
1461 .mode = 0644,
1462 .proc_handler = proc_dointvec
1463 },
1464#endif
Masami Hiramatsub2be84d2010-02-25 08:34:15 -05001465#if defined(CONFIG_OPTPROBES)
1466 {
1467 .procname = "kprobes-optimization",
1468 .data = &sysctl_kprobes_optimization,
1469 .maxlen = sizeof(int),
1470 .mode = 0644,
1471 .proc_handler = proc_kprobes_optimization_handler,
1472 .extra1 = &zero,
1473 .extra2 = &one,
1474 },
1475#endif
Eric W. Biederman6fce56e2009-04-03 02:30:53 -07001476 { }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001477};
1478
Eric W. Biedermand8217f02007-10-18 03:05:22 -07001479static struct ctl_table dev_table[] = {
Eric W. Biederman6fce56e2009-04-03 02:30:53 -07001480 { }
Robert Love0eeca282005-07-12 17:06:03 -04001481};
Linus Torvalds1da177e2005-04-16 15:20:36 -07001482
Al Viro330d57f2005-11-04 10:18:40 +00001483static DEFINE_SPINLOCK(sysctl_lock);
1484
1485/* called under sysctl_lock */
1486static int use_table(struct ctl_table_header *p)
1487{
1488 if (unlikely(p->unregistering))
1489 return 0;
1490 p->used++;
1491 return 1;
1492}
1493
1494/* called under sysctl_lock */
1495static void unuse_table(struct ctl_table_header *p)
1496{
1497 if (!--p->used)
1498 if (unlikely(p->unregistering))
1499 complete(p->unregistering);
1500}
1501
1502/* called under sysctl_lock, will reacquire if has to wait */
1503static void start_unregistering(struct ctl_table_header *p)
1504{
1505 /*
1506 * if p->used is 0, nobody will ever touch that entry again;
1507 * we'll eliminate all paths to it before dropping sysctl_lock
1508 */
1509 if (unlikely(p->used)) {
1510 struct completion wait;
1511 init_completion(&wait);
1512 p->unregistering = &wait;
1513 spin_unlock(&sysctl_lock);
1514 wait_for_completion(&wait);
1515 spin_lock(&sysctl_lock);
Al Virof7e6ced2008-07-15 01:44:23 -04001516 } else {
1517 /* anything non-NULL; we'll never dereference it */
1518 p->unregistering = ERR_PTR(-EINVAL);
Al Viro330d57f2005-11-04 10:18:40 +00001519 }
1520 /*
1521 * do not remove from the list until nobody holds it; walking the
1522 * list in do_sysctl() relies on that.
1523 */
1524 list_del_init(&p->ctl_entry);
1525}
1526
Al Virof7e6ced2008-07-15 01:44:23 -04001527void sysctl_head_get(struct ctl_table_header *head)
1528{
1529 spin_lock(&sysctl_lock);
1530 head->count++;
1531 spin_unlock(&sysctl_lock);
1532}
1533
1534void sysctl_head_put(struct ctl_table_header *head)
1535{
1536 spin_lock(&sysctl_lock);
1537 if (!--head->count)
1538 kfree(head);
1539 spin_unlock(&sysctl_lock);
1540}
1541
1542struct ctl_table_header *sysctl_head_grab(struct ctl_table_header *head)
1543{
1544 if (!head)
1545 BUG();
1546 spin_lock(&sysctl_lock);
1547 if (!use_table(head))
1548 head = ERR_PTR(-ENOENT);
1549 spin_unlock(&sysctl_lock);
1550 return head;
1551}
1552
Eric W. Biederman805b5d52007-02-14 00:34:11 -08001553void sysctl_head_finish(struct ctl_table_header *head)
1554{
1555 if (!head)
1556 return;
1557 spin_lock(&sysctl_lock);
1558 unuse_table(head);
1559 spin_unlock(&sysctl_lock);
1560}
1561
Al Viro73455092008-07-14 21:22:20 -04001562static struct ctl_table_set *
1563lookup_header_set(struct ctl_table_root *root, struct nsproxy *namespaces)
1564{
1565 struct ctl_table_set *set = &root->default_set;
1566 if (root->lookup)
1567 set = root->lookup(root, namespaces);
1568 return set;
1569}
1570
Eric W. Biedermane51b6ba2007-11-30 23:54:00 +11001571static struct list_head *
1572lookup_header_list(struct ctl_table_root *root, struct nsproxy *namespaces)
Eric W. Biederman805b5d52007-02-14 00:34:11 -08001573{
Al Viro73455092008-07-14 21:22:20 -04001574 struct ctl_table_set *set = lookup_header_set(root, namespaces);
1575 return &set->list;
Eric W. Biedermane51b6ba2007-11-30 23:54:00 +11001576}
1577
1578struct ctl_table_header *__sysctl_head_next(struct nsproxy *namespaces,
1579 struct ctl_table_header *prev)
1580{
1581 struct ctl_table_root *root;
1582 struct list_head *header_list;
Eric W. Biederman805b5d52007-02-14 00:34:11 -08001583 struct ctl_table_header *head;
1584 struct list_head *tmp;
Eric W. Biedermane51b6ba2007-11-30 23:54:00 +11001585
Eric W. Biederman805b5d52007-02-14 00:34:11 -08001586 spin_lock(&sysctl_lock);
1587 if (prev) {
Eric W. Biedermane51b6ba2007-11-30 23:54:00 +11001588 head = prev;
Eric W. Biederman805b5d52007-02-14 00:34:11 -08001589 tmp = &prev->ctl_entry;
1590 unuse_table(prev);
1591 goto next;
1592 }
1593 tmp = &root_table_header.ctl_entry;
1594 for (;;) {
1595 head = list_entry(tmp, struct ctl_table_header, ctl_entry);
1596
1597 if (!use_table(head))
1598 goto next;
1599 spin_unlock(&sysctl_lock);
1600 return head;
1601 next:
Eric W. Biedermane51b6ba2007-11-30 23:54:00 +11001602 root = head->root;
Eric W. Biederman805b5d52007-02-14 00:34:11 -08001603 tmp = tmp->next;
Eric W. Biedermane51b6ba2007-11-30 23:54:00 +11001604 header_list = lookup_header_list(root, namespaces);
1605 if (tmp != header_list)
1606 continue;
1607
1608 do {
1609 root = list_entry(root->root_list.next,
1610 struct ctl_table_root, root_list);
1611 if (root == &sysctl_table_root)
1612 goto out;
1613 header_list = lookup_header_list(root, namespaces);
1614 } while (list_empty(header_list));
1615 tmp = header_list->next;
Eric W. Biederman805b5d52007-02-14 00:34:11 -08001616 }
Eric W. Biedermane51b6ba2007-11-30 23:54:00 +11001617out:
Eric W. Biederman805b5d52007-02-14 00:34:11 -08001618 spin_unlock(&sysctl_lock);
1619 return NULL;
1620}
1621
Eric W. Biedermane51b6ba2007-11-30 23:54:00 +11001622struct ctl_table_header *sysctl_head_next(struct ctl_table_header *prev)
1623{
1624 return __sysctl_head_next(current->nsproxy, prev);
1625}
1626
1627void register_sysctl_root(struct ctl_table_root *root)
1628{
1629 spin_lock(&sysctl_lock);
1630 list_add_tail(&root->root_list, &sysctl_table_root.root_list);
1631 spin_unlock(&sysctl_lock);
1632}
1633
Linus Torvalds1da177e2005-04-16 15:20:36 -07001634/*
Eric W. Biederman1ff007e2007-02-14 00:34:11 -08001635 * sysctl_perm does NOT grant the superuser all rights automatically, because
Linus Torvalds1da177e2005-04-16 15:20:36 -07001636 * some sysctl variables are readonly even to root.
1637 */
1638
1639static int test_perm(int mode, int op)
1640{
David Howells76aac0e2008-11-14 10:39:12 +11001641 if (!current_euid())
Linus Torvalds1da177e2005-04-16 15:20:36 -07001642 mode >>= 6;
1643 else if (in_egroup_p(0))
1644 mode >>= 3;
Al Viroe6305c42008-07-15 21:03:57 -04001645 if ((op & ~mode & (MAY_READ|MAY_WRITE|MAY_EXEC)) == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001646 return 0;
1647 return -EACCES;
1648}
1649
Pavel Emelyanovd7321cd2008-04-29 01:02:44 -07001650int sysctl_perm(struct ctl_table_root *root, struct ctl_table *table, int op)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001651{
1652 int error;
Pavel Emelyanovd7321cd2008-04-29 01:02:44 -07001653 int mode;
1654
Al Viroe6305c42008-07-15 21:03:57 -04001655 error = security_sysctl(table, op & (MAY_READ | MAY_WRITE | MAY_EXEC));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001656 if (error)
1657 return error;
Pavel Emelyanovd7321cd2008-04-29 01:02:44 -07001658
1659 if (root->permissions)
1660 mode = root->permissions(root, current->nsproxy, table);
1661 else
1662 mode = table->mode;
1663
1664 return test_perm(mode, op);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001665}
1666
Eric W. Biedermand912b0c2007-02-14 00:34:13 -08001667static void sysctl_set_parent(struct ctl_table *parent, struct ctl_table *table)
1668{
Eric W. Biederman2315ffa2009-04-03 03:18:02 -07001669 for (; table->procname; table++) {
Eric W. Biedermand912b0c2007-02-14 00:34:13 -08001670 table->parent = parent;
1671 if (table->child)
1672 sysctl_set_parent(table, table->child);
1673 }
1674}
1675
1676static __init int sysctl_init(void)
1677{
1678 sysctl_set_parent(NULL, root_table);
Holger Schurig88f458e2008-04-29 01:02:36 -07001679#ifdef CONFIG_SYSCTL_SYSCALL_CHECK
1680 {
1681 int err;
1682 err = sysctl_check_table(current->nsproxy, root_table);
1683 }
1684#endif
Eric W. Biedermand912b0c2007-02-14 00:34:13 -08001685 return 0;
1686}
1687
1688core_initcall(sysctl_init);
1689
Al Virobfbcf032008-07-27 06:31:22 +01001690static struct ctl_table *is_branch_in(struct ctl_table *branch,
1691 struct ctl_table *table)
Al Viroae7edec2008-07-15 06:33:31 -04001692{
1693 struct ctl_table *p;
1694 const char *s = branch->procname;
1695
1696 /* branch should have named subdirectory as its first element */
1697 if (!s || !branch->child)
Al Virobfbcf032008-07-27 06:31:22 +01001698 return NULL;
Al Viroae7edec2008-07-15 06:33:31 -04001699
1700 /* ... and nothing else */
Eric W. Biederman2315ffa2009-04-03 03:18:02 -07001701 if (branch[1].procname)
Al Virobfbcf032008-07-27 06:31:22 +01001702 return NULL;
Al Viroae7edec2008-07-15 06:33:31 -04001703
1704 /* table should contain subdirectory with the same name */
Eric W. Biederman2315ffa2009-04-03 03:18:02 -07001705 for (p = table; p->procname; p++) {
Al Viroae7edec2008-07-15 06:33:31 -04001706 if (!p->child)
1707 continue;
1708 if (p->procname && strcmp(p->procname, s) == 0)
Al Virobfbcf032008-07-27 06:31:22 +01001709 return p;
Al Viroae7edec2008-07-15 06:33:31 -04001710 }
Al Virobfbcf032008-07-27 06:31:22 +01001711 return NULL;
Al Viroae7edec2008-07-15 06:33:31 -04001712}
1713
1714/* see if attaching q to p would be an improvement */
1715static void try_attach(struct ctl_table_header *p, struct ctl_table_header *q)
1716{
1717 struct ctl_table *to = p->ctl_table, *by = q->ctl_table;
Al Virobfbcf032008-07-27 06:31:22 +01001718 struct ctl_table *next;
Al Viroae7edec2008-07-15 06:33:31 -04001719 int is_better = 0;
1720 int not_in_parent = !p->attached_by;
1721
Al Virobfbcf032008-07-27 06:31:22 +01001722 while ((next = is_branch_in(by, to)) != NULL) {
Al Viroae7edec2008-07-15 06:33:31 -04001723 if (by == q->attached_by)
1724 is_better = 1;
1725 if (to == p->attached_by)
1726 not_in_parent = 1;
1727 by = by->child;
Al Virobfbcf032008-07-27 06:31:22 +01001728 to = next->child;
Al Viroae7edec2008-07-15 06:33:31 -04001729 }
1730
1731 if (is_better && not_in_parent) {
1732 q->attached_by = by;
1733 q->attached_to = to;
1734 q->parent = p;
1735 }
1736}
1737
Linus Torvalds1da177e2005-04-16 15:20:36 -07001738/**
Eric W. Biedermane51b6ba2007-11-30 23:54:00 +11001739 * __register_sysctl_paths - register a sysctl hierarchy
1740 * @root: List of sysctl headers to register on
1741 * @namespaces: Data to compute which lists of sysctl entries are visible
Eric W. Biederman29e796f2007-11-30 23:50:18 +11001742 * @path: The path to the directory the sysctl table is in.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001743 * @table: the top-level table structure
Linus Torvalds1da177e2005-04-16 15:20:36 -07001744 *
1745 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
Eric W. Biederman29e796f2007-11-30 23:50:18 +11001746 * array. A completely 0 filled entry terminates the table.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001747 *
Eric W. Biedermand8217f02007-10-18 03:05:22 -07001748 * The members of the &struct ctl_table structure are used as follows:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001749 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07001750 * procname - the name of the sysctl file under /proc/sys. Set to %NULL to not
1751 * enter a sysctl file
1752 *
1753 * data - a pointer to data for use by proc_handler
1754 *
1755 * maxlen - the maximum size in bytes of the data
1756 *
1757 * mode - the file permissions for the /proc/sys file, and for sysctl(2)
1758 *
1759 * child - a pointer to the child sysctl table if this entry is a directory, or
1760 * %NULL.
1761 *
1762 * proc_handler - the text handler routine (described below)
1763 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07001764 * de - for internal use by the sysctl routines
1765 *
1766 * extra1, extra2 - extra pointers usable by the proc handler routines
1767 *
1768 * Leaf nodes in the sysctl tree will be represented by a single file
1769 * under /proc; non-leaf nodes will be represented by directories.
1770 *
1771 * sysctl(2) can automatically manage read and write requests through
1772 * the sysctl table. The data and maxlen fields of the ctl_table
1773 * struct enable minimal validation of the values being written to be
1774 * performed, and the mode field allows minimal authentication.
1775 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07001776 * There must be a proc_handler routine for any terminal nodes
1777 * mirrored under /proc/sys (non-terminals are handled by a built-in
1778 * directory handler). Several default handlers are available to
1779 * cover common cases -
1780 *
1781 * proc_dostring(), proc_dointvec(), proc_dointvec_jiffies(),
1782 * proc_dointvec_userhz_jiffies(), proc_dointvec_minmax(),
1783 * proc_doulongvec_ms_jiffies_minmax(), proc_doulongvec_minmax()
1784 *
1785 * It is the handler's job to read the input buffer from user memory
1786 * and process it. The handler should return 0 on success.
1787 *
1788 * This routine returns %NULL on a failure to register, and a pointer
1789 * to the table header on success.
1790 */
Eric W. Biedermane51b6ba2007-11-30 23:54:00 +11001791struct ctl_table_header *__register_sysctl_paths(
1792 struct ctl_table_root *root,
1793 struct nsproxy *namespaces,
1794 const struct ctl_path *path, struct ctl_table *table)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001795{
Eric W. Biederman29e796f2007-11-30 23:50:18 +11001796 struct ctl_table_header *header;
1797 struct ctl_table *new, **prevp;
1798 unsigned int n, npath;
Al Viroae7edec2008-07-15 06:33:31 -04001799 struct ctl_table_set *set;
Eric W. Biederman29e796f2007-11-30 23:50:18 +11001800
1801 /* Count the path components */
Eric W. Biederman2315ffa2009-04-03 03:18:02 -07001802 for (npath = 0; path[npath].procname; ++npath)
Eric W. Biederman29e796f2007-11-30 23:50:18 +11001803 ;
1804
1805 /*
1806 * For each path component, allocate a 2-element ctl_table array.
1807 * The first array element will be filled with the sysctl entry
Eric W. Biederman2315ffa2009-04-03 03:18:02 -07001808 * for this, the second will be the sentinel (procname == 0).
Eric W. Biederman29e796f2007-11-30 23:50:18 +11001809 *
1810 * We allocate everything in one go so that we don't have to
1811 * worry about freeing additional memory in unregister_sysctl_table.
1812 */
1813 header = kzalloc(sizeof(struct ctl_table_header) +
1814 (2 * npath * sizeof(struct ctl_table)), GFP_KERNEL);
1815 if (!header)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001816 return NULL;
Eric W. Biederman29e796f2007-11-30 23:50:18 +11001817
1818 new = (struct ctl_table *) (header + 1);
1819
1820 /* Now connect the dots */
1821 prevp = &header->ctl_table;
1822 for (n = 0; n < npath; ++n, ++path) {
1823 /* Copy the procname */
1824 new->procname = path->procname;
Eric W. Biederman29e796f2007-11-30 23:50:18 +11001825 new->mode = 0555;
1826
1827 *prevp = new;
1828 prevp = &new->child;
1829
1830 new += 2;
1831 }
1832 *prevp = table;
Eric W. Biederman23eb06d2007-11-30 23:52:10 +11001833 header->ctl_table_arg = table;
Eric W. Biederman29e796f2007-11-30 23:50:18 +11001834
1835 INIT_LIST_HEAD(&header->ctl_entry);
1836 header->used = 0;
1837 header->unregistering = NULL;
Eric W. Biedermane51b6ba2007-11-30 23:54:00 +11001838 header->root = root;
Eric W. Biederman29e796f2007-11-30 23:50:18 +11001839 sysctl_set_parent(NULL, header->ctl_table);
Al Virof7e6ced2008-07-15 01:44:23 -04001840 header->count = 1;
Holger Schurig88f458e2008-04-29 01:02:36 -07001841#ifdef CONFIG_SYSCTL_SYSCALL_CHECK
Eric W. Biedermane51b6ba2007-11-30 23:54:00 +11001842 if (sysctl_check_table(namespaces, header->ctl_table)) {
Eric W. Biederman29e796f2007-11-30 23:50:18 +11001843 kfree(header);
Eric W. Biedermanfc6cd252007-10-18 03:05:54 -07001844 return NULL;
1845 }
Holger Schurig88f458e2008-04-29 01:02:36 -07001846#endif
Al Viro330d57f2005-11-04 10:18:40 +00001847 spin_lock(&sysctl_lock);
Al Viro73455092008-07-14 21:22:20 -04001848 header->set = lookup_header_set(root, namespaces);
Al Viroae7edec2008-07-15 06:33:31 -04001849 header->attached_by = header->ctl_table;
1850 header->attached_to = root_table;
1851 header->parent = &root_table_header;
1852 for (set = header->set; set; set = set->parent) {
1853 struct ctl_table_header *p;
1854 list_for_each_entry(p, &set->list, ctl_entry) {
1855 if (p->unregistering)
1856 continue;
1857 try_attach(p, header);
1858 }
1859 }
1860 header->parent->count++;
Al Viro73455092008-07-14 21:22:20 -04001861 list_add_tail(&header->ctl_entry, &header->set->list);
Al Viro330d57f2005-11-04 10:18:40 +00001862 spin_unlock(&sysctl_lock);
Eric W. Biederman29e796f2007-11-30 23:50:18 +11001863
1864 return header;
1865}
1866
1867/**
Eric W. Biedermane51b6ba2007-11-30 23:54:00 +11001868 * register_sysctl_table_path - register a sysctl table hierarchy
1869 * @path: The path to the directory the sysctl table is in.
1870 * @table: the top-level table structure
1871 *
1872 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1873 * array. A completely 0 filled entry terminates the table.
1874 *
1875 * See __register_sysctl_paths for more details.
1876 */
1877struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1878 struct ctl_table *table)
1879{
1880 return __register_sysctl_paths(&sysctl_table_root, current->nsproxy,
1881 path, table);
1882}
1883
1884/**
Eric W. Biederman29e796f2007-11-30 23:50:18 +11001885 * register_sysctl_table - register a sysctl table hierarchy
1886 * @table: the top-level table structure
1887 *
1888 * Register a sysctl table hierarchy. @table should be a filled in ctl_table
1889 * array. A completely 0 filled entry terminates the table.
1890 *
1891 * See register_sysctl_paths for more details.
1892 */
1893struct ctl_table_header *register_sysctl_table(struct ctl_table *table)
1894{
1895 static const struct ctl_path null_path[] = { {} };
1896
1897 return register_sysctl_paths(null_path, table);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001898}
1899
1900/**
1901 * unregister_sysctl_table - unregister a sysctl table hierarchy
1902 * @header: the header returned from register_sysctl_table
1903 *
1904 * Unregisters the sysctl table and all children. proc entries may not
1905 * actually be removed until they are no longer used by anyone.
1906 */
1907void unregister_sysctl_table(struct ctl_table_header * header)
1908{
Al Viro330d57f2005-11-04 10:18:40 +00001909 might_sleep();
Pavel Emelyanovf1dad162007-12-04 23:45:24 -08001910
1911 if (header == NULL)
1912 return;
1913
Al Viro330d57f2005-11-04 10:18:40 +00001914 spin_lock(&sysctl_lock);
1915 start_unregistering(header);
Al Viroae7edec2008-07-15 06:33:31 -04001916 if (!--header->parent->count) {
1917 WARN_ON(1);
1918 kfree(header->parent);
1919 }
Al Virof7e6ced2008-07-15 01:44:23 -04001920 if (!--header->count)
1921 kfree(header);
Al Viro330d57f2005-11-04 10:18:40 +00001922 spin_unlock(&sysctl_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001923}
1924
Al Viro9043476f2008-07-15 08:54:06 -04001925int sysctl_is_seen(struct ctl_table_header *p)
1926{
1927 struct ctl_table_set *set = p->set;
1928 int res;
1929 spin_lock(&sysctl_lock);
1930 if (p->unregistering)
1931 res = 0;
1932 else if (!set->is_seen)
1933 res = 1;
1934 else
1935 res = set->is_seen(set);
1936 spin_unlock(&sysctl_lock);
1937 return res;
1938}
1939
Al Viro73455092008-07-14 21:22:20 -04001940void setup_sysctl_set(struct ctl_table_set *p,
1941 struct ctl_table_set *parent,
1942 int (*is_seen)(struct ctl_table_set *))
1943{
1944 INIT_LIST_HEAD(&p->list);
1945 p->parent = parent ? parent : &sysctl_table_root.default_set;
1946 p->is_seen = is_seen;
1947}
1948
Eric W. Biedermanb89a8172006-09-27 01:51:04 -07001949#else /* !CONFIG_SYSCTL */
Eric W. Biedermand8217f02007-10-18 03:05:22 -07001950struct ctl_table_header *register_sysctl_table(struct ctl_table * table)
Eric W. Biedermanb89a8172006-09-27 01:51:04 -07001951{
1952 return NULL;
1953}
1954
Eric W. Biederman29e796f2007-11-30 23:50:18 +11001955struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path,
1956 struct ctl_table *table)
1957{
1958 return NULL;
1959}
1960
Eric W. Biedermanb89a8172006-09-27 01:51:04 -07001961void unregister_sysctl_table(struct ctl_table_header * table)
1962{
1963}
1964
Al Viro73455092008-07-14 21:22:20 -04001965void setup_sysctl_set(struct ctl_table_set *p,
1966 struct ctl_table_set *parent,
1967 int (*is_seen)(struct ctl_table_set *))
1968{
1969}
1970
Al Virof7e6ced2008-07-15 01:44:23 -04001971void sysctl_head_put(struct ctl_table_header *head)
1972{
1973}
1974
Eric W. Biedermanb89a8172006-09-27 01:51:04 -07001975#endif /* CONFIG_SYSCTL */
1976
Linus Torvalds1da177e2005-04-16 15:20:36 -07001977/*
1978 * /proc/sys support
1979 */
1980
Eric W. Biedermanb89a8172006-09-27 01:51:04 -07001981#ifdef CONFIG_PROC_SYSCTL
Linus Torvalds1da177e2005-04-16 15:20:36 -07001982
Adrian Bunkb1ba4dd2006-10-02 02:18:05 -07001983static int _proc_do_string(void* data, int maxlen, int write,
Alexey Dobriyan8d65af72009-09-23 15:57:19 -07001984 void __user *buffer,
Adrian Bunkb1ba4dd2006-10-02 02:18:05 -07001985 size_t *lenp, loff_t *ppos)
Sam Vilainf5dd3d62006-10-02 02:18:04 -07001986{
1987 size_t len;
1988 char __user *p;
1989 char c;
Oleg Nesterov8d060872007-02-10 01:46:38 -08001990
1991 if (!data || !maxlen || !*lenp) {
Sam Vilainf5dd3d62006-10-02 02:18:04 -07001992 *lenp = 0;
1993 return 0;
1994 }
Oleg Nesterov8d060872007-02-10 01:46:38 -08001995
Sam Vilainf5dd3d62006-10-02 02:18:04 -07001996 if (write) {
1997 len = 0;
1998 p = buffer;
1999 while (len < *lenp) {
2000 if (get_user(c, p++))
2001 return -EFAULT;
2002 if (c == 0 || c == '\n')
2003 break;
2004 len++;
2005 }
2006 if (len >= maxlen)
2007 len = maxlen-1;
2008 if(copy_from_user(data, buffer, len))
2009 return -EFAULT;
2010 ((char *) data)[len] = 0;
2011 *ppos += *lenp;
2012 } else {
2013 len = strlen(data);
2014 if (len > maxlen)
2015 len = maxlen;
Oleg Nesterov8d060872007-02-10 01:46:38 -08002016
2017 if (*ppos > len) {
2018 *lenp = 0;
2019 return 0;
2020 }
2021
2022 data += *ppos;
2023 len -= *ppos;
2024
Sam Vilainf5dd3d62006-10-02 02:18:04 -07002025 if (len > *lenp)
2026 len = *lenp;
2027 if (len)
2028 if(copy_to_user(buffer, data, len))
2029 return -EFAULT;
2030 if (len < *lenp) {
2031 if(put_user('\n', ((char __user *) buffer) + len))
2032 return -EFAULT;
2033 len++;
2034 }
2035 *lenp = len;
2036 *ppos += len;
2037 }
2038 return 0;
2039}
2040
Linus Torvalds1da177e2005-04-16 15:20:36 -07002041/**
2042 * proc_dostring - read a string sysctl
2043 * @table: the sysctl table
2044 * @write: %TRUE if this is a write to the sysctl file
Linus Torvalds1da177e2005-04-16 15:20:36 -07002045 * @buffer: the user buffer
2046 * @lenp: the size of the user buffer
2047 * @ppos: file position
2048 *
2049 * Reads/writes a string from/to the user buffer. If the kernel
2050 * buffer provided is not large enough to hold the string, the
2051 * string is truncated. The copied string is %NULL-terminated.
2052 * If the string is being read by the user process, it is copied
2053 * and a newline '\n' is added. It is truncated if the buffer is
2054 * not large enough.
2055 *
2056 * Returns 0 on success.
2057 */
Alexey Dobriyan8d65af72009-09-23 15:57:19 -07002058int proc_dostring(struct ctl_table *table, int write,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002059 void __user *buffer, size_t *lenp, loff_t *ppos)
2060{
Alexey Dobriyan8d65af72009-09-23 15:57:19 -07002061 return _proc_do_string(table->data, table->maxlen, write,
Sam Vilainf5dd3d62006-10-02 02:18:04 -07002062 buffer, lenp, ppos);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002063}
2064
Amerigo Wang00b7c332010-05-05 00:26:45 +00002065static size_t proc_skip_spaces(char **buf)
2066{
2067 size_t ret;
2068 char *tmp = skip_spaces(*buf);
2069 ret = tmp - *buf;
2070 *buf = tmp;
2071 return ret;
2072}
Linus Torvalds1da177e2005-04-16 15:20:36 -07002073
Octavian Purdila9f977fb2010-05-05 00:26:55 +00002074static void proc_skip_char(char **buf, size_t *size, const char v)
2075{
2076 while (*size) {
2077 if (**buf != v)
2078 break;
2079 (*size)--;
2080 (*buf)++;
2081 }
2082}
2083
Amerigo Wang00b7c332010-05-05 00:26:45 +00002084#define TMPBUFLEN 22
2085/**
2086 * proc_get_long - reads an ASCII formated integer from a user buffer
2087 *
2088 * @buf - a kernel buffer
2089 * @size - size of the kernel buffer
2090 * @val - this is where the number will be stored
2091 * @neg - set to %TRUE if number is negative
2092 * @perm_tr - a vector which contains the allowed trailers
2093 * @perm_tr_len - size of the perm_tr vector
2094 * @tr - pointer to store the trailer character
2095 *
2096 * In case of success 0 is returned and buf and size are updated with
2097 * the amount of bytes read. If tr is non NULL and a trailing
2098 * character exist (size is non zero after returning from this
2099 * function) tr is updated with the trailing character.
2100 */
2101static int proc_get_long(char **buf, size_t *size,
2102 unsigned long *val, bool *neg,
2103 const char *perm_tr, unsigned perm_tr_len, char *tr)
2104{
2105 int len;
2106 char *p, tmp[TMPBUFLEN];
2107
2108 if (!*size)
2109 return -EINVAL;
2110
2111 len = *size;
2112 if (len > TMPBUFLEN - 1)
2113 len = TMPBUFLEN - 1;
2114
2115 memcpy(tmp, *buf, len);
2116
2117 tmp[len] = 0;
2118 p = tmp;
2119 if (*p == '-' && *size > 1) {
2120 *neg = true;
2121 p++;
2122 } else
2123 *neg = false;
2124 if (!isdigit(*p))
2125 return -EINVAL;
2126
2127 *val = simple_strtoul(p, &p, 0);
2128
2129 len = p - tmp;
2130
2131 /* We don't know if the next char is whitespace thus we may accept
2132 * invalid integers (e.g. 1234...a) or two integers instead of one
2133 * (e.g. 123...1). So lets not allow such large numbers. */
2134 if (len == TMPBUFLEN - 1)
2135 return -EINVAL;
2136
2137 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
2138 return -EINVAL;
2139
2140 if (tr && (len < *size))
2141 *tr = *p;
2142
2143 *buf += len;
2144 *size -= len;
2145
2146 return 0;
2147}
2148
2149/**
2150 * proc_put_long - coverts an integer to a decimal ASCII formated string
2151 *
2152 * @buf - the user buffer
2153 * @size - the size of the user buffer
2154 * @val - the integer to be converted
2155 * @neg - sign of the number, %TRUE for negative
2156 *
2157 * In case of success 0 is returned and buf and size are updated with
2158 * the amount of bytes read.
2159 */
2160static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
2161 bool neg)
2162{
2163 int len;
2164 char tmp[TMPBUFLEN], *p = tmp;
2165
2166 sprintf(p, "%s%lu", neg ? "-" : "", val);
2167 len = strlen(tmp);
2168 if (len > *size)
2169 len = *size;
2170 if (copy_to_user(*buf, tmp, len))
2171 return -EFAULT;
2172 *size -= len;
2173 *buf += len;
2174 return 0;
2175}
2176#undef TMPBUFLEN
2177
2178static int proc_put_char(void __user **buf, size_t *size, char c)
2179{
2180 if (*size) {
2181 char __user **buffer = (char __user **)buf;
2182 if (put_user(c, *buffer))
2183 return -EFAULT;
2184 (*size)--, (*buffer)++;
2185 *buf = *buffer;
2186 }
2187 return 0;
2188}
2189
2190static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002191 int *valp,
2192 int write, void *data)
2193{
2194 if (write) {
2195 *valp = *negp ? -*lvalp : *lvalp;
2196 } else {
2197 int val = *valp;
2198 if (val < 0) {
Amerigo Wang00b7c332010-05-05 00:26:45 +00002199 *negp = true;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002200 *lvalp = (unsigned long)-val;
2201 } else {
Amerigo Wang00b7c332010-05-05 00:26:45 +00002202 *negp = false;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002203 *lvalp = (unsigned long)val;
2204 }
2205 }
2206 return 0;
2207}
2208
Amerigo Wang00b7c332010-05-05 00:26:45 +00002209static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
2210
Eric W. Biedermand8217f02007-10-18 03:05:22 -07002211static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
Alexey Dobriyan8d65af72009-09-23 15:57:19 -07002212 int write, void __user *buffer,
Kirill Korotaevfcfbd542006-10-02 02:18:23 -07002213 size_t *lenp, loff_t *ppos,
Amerigo Wang00b7c332010-05-05 00:26:45 +00002214 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002215 int write, void *data),
2216 void *data)
2217{
Amerigo Wang00b7c332010-05-05 00:26:45 +00002218 int *i, vleft, first = 1, err = 0;
2219 unsigned long page = 0;
2220 size_t left;
2221 char *kbuf;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002222
Amerigo Wang00b7c332010-05-05 00:26:45 +00002223 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002224 *lenp = 0;
2225 return 0;
2226 }
2227
Kirill Korotaevfcfbd542006-10-02 02:18:23 -07002228 i = (int *) tbl_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002229 vleft = table->maxlen / sizeof(*i);
2230 left = *lenp;
2231
2232 if (!conv)
2233 conv = do_proc_dointvec_conv;
2234
Linus Torvalds1da177e2005-04-16 15:20:36 -07002235 if (write) {
Amerigo Wang00b7c332010-05-05 00:26:45 +00002236 if (left > PAGE_SIZE - 1)
2237 left = PAGE_SIZE - 1;
2238 page = __get_free_page(GFP_TEMPORARY);
2239 kbuf = (char *) page;
2240 if (!kbuf)
2241 return -ENOMEM;
2242 if (copy_from_user(kbuf, buffer, left)) {
2243 err = -EFAULT;
2244 goto free;
2245 }
2246 kbuf[left] = 0;
2247 }
2248
2249 for (; left && vleft--; i++, first=0) {
2250 unsigned long lval;
2251 bool neg;
2252
2253 if (write) {
2254 left -= proc_skip_spaces(&kbuf);
2255
J. R. Okajima563b0462010-05-25 16:10:14 -07002256 if (!left)
2257 break;
Amerigo Wang00b7c332010-05-05 00:26:45 +00002258 err = proc_get_long(&kbuf, &left, &lval, &neg,
2259 proc_wspace_sep,
2260 sizeof(proc_wspace_sep), NULL);
2261 if (err)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002262 break;
Amerigo Wang00b7c332010-05-05 00:26:45 +00002263 if (conv(&neg, &lval, i, 1, data)) {
2264 err = -EINVAL;
2265 break;
2266 }
2267 } else {
2268 if (conv(&neg, &lval, i, 0, data)) {
2269 err = -EINVAL;
2270 break;
2271 }
2272 if (!first)
2273 err = proc_put_char(&buffer, &left, '\t');
2274 if (err)
2275 break;
2276 err = proc_put_long(&buffer, &left, lval, neg);
2277 if (err)
2278 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002279 }
2280 }
Amerigo Wang00b7c332010-05-05 00:26:45 +00002281
2282 if (!write && !first && left && !err)
2283 err = proc_put_char(&buffer, &left, '\n');
J. R. Okajima563b0462010-05-25 16:10:14 -07002284 if (write && !err && left)
Amerigo Wang00b7c332010-05-05 00:26:45 +00002285 left -= proc_skip_spaces(&kbuf);
2286free:
2287 if (write) {
2288 free_page(page);
2289 if (first)
2290 return err ? : -EINVAL;
2291 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002292 *lenp -= left;
2293 *ppos += *lenp;
Amerigo Wang00b7c332010-05-05 00:26:45 +00002294 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002295}
2296
Alexey Dobriyan8d65af72009-09-23 15:57:19 -07002297static int do_proc_dointvec(struct ctl_table *table, int write,
Kirill Korotaevfcfbd542006-10-02 02:18:23 -07002298 void __user *buffer, size_t *lenp, loff_t *ppos,
Amerigo Wang00b7c332010-05-05 00:26:45 +00002299 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
Kirill Korotaevfcfbd542006-10-02 02:18:23 -07002300 int write, void *data),
2301 void *data)
2302{
Alexey Dobriyan8d65af72009-09-23 15:57:19 -07002303 return __do_proc_dointvec(table->data, table, write,
Kirill Korotaevfcfbd542006-10-02 02:18:23 -07002304 buffer, lenp, ppos, conv, data);
2305}
2306
Linus Torvalds1da177e2005-04-16 15:20:36 -07002307/**
2308 * proc_dointvec - read a vector of integers
2309 * @table: the sysctl table
2310 * @write: %TRUE if this is a write to the sysctl file
Linus Torvalds1da177e2005-04-16 15:20:36 -07002311 * @buffer: the user buffer
2312 * @lenp: the size of the user buffer
2313 * @ppos: file position
2314 *
2315 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2316 * values from/to the user buffer, treated as an ASCII string.
2317 *
2318 * Returns 0 on success.
2319 */
Alexey Dobriyan8d65af72009-09-23 15:57:19 -07002320int proc_dointvec(struct ctl_table *table, int write,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002321 void __user *buffer, size_t *lenp, loff_t *ppos)
2322{
Alexey Dobriyan8d65af72009-09-23 15:57:19 -07002323 return do_proc_dointvec(table,write,buffer,lenp,ppos,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002324 NULL,NULL);
2325}
2326
Theodore Ts'o34f5a392007-02-10 01:45:24 -08002327/*
Andi Kleen25ddbb12008-10-15 22:01:41 -07002328 * Taint values can only be increased
2329 * This means we can safely use a temporary.
Theodore Ts'o34f5a392007-02-10 01:45:24 -08002330 */
Alexey Dobriyan8d65af72009-09-23 15:57:19 -07002331static int proc_taint(struct ctl_table *table, int write,
Theodore Ts'o34f5a392007-02-10 01:45:24 -08002332 void __user *buffer, size_t *lenp, loff_t *ppos)
2333{
Andi Kleen25ddbb12008-10-15 22:01:41 -07002334 struct ctl_table t;
2335 unsigned long tmptaint = get_taint();
2336 int err;
Theodore Ts'o34f5a392007-02-10 01:45:24 -08002337
Bastian Blank91fcd412007-04-23 14:41:14 -07002338 if (write && !capable(CAP_SYS_ADMIN))
Theodore Ts'o34f5a392007-02-10 01:45:24 -08002339 return -EPERM;
2340
Andi Kleen25ddbb12008-10-15 22:01:41 -07002341 t = *table;
2342 t.data = &tmptaint;
Alexey Dobriyan8d65af72009-09-23 15:57:19 -07002343 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
Andi Kleen25ddbb12008-10-15 22:01:41 -07002344 if (err < 0)
2345 return err;
2346
2347 if (write) {
2348 /*
2349 * Poor man's atomic or. Not worth adding a primitive
2350 * to everyone's atomic.h for this
2351 */
2352 int i;
2353 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2354 if ((tmptaint >> i) & 1)
2355 add_taint(i);
2356 }
2357 }
2358
2359 return err;
Theodore Ts'o34f5a392007-02-10 01:45:24 -08002360}
2361
Linus Torvalds1da177e2005-04-16 15:20:36 -07002362struct do_proc_dointvec_minmax_conv_param {
2363 int *min;
2364 int *max;
2365};
2366
Amerigo Wang00b7c332010-05-05 00:26:45 +00002367static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2368 int *valp,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002369 int write, void *data)
2370{
2371 struct do_proc_dointvec_minmax_conv_param *param = data;
2372 if (write) {
2373 int val = *negp ? -*lvalp : *lvalp;
2374 if ((param->min && *param->min > val) ||
2375 (param->max && *param->max < val))
2376 return -EINVAL;
2377 *valp = val;
2378 } else {
2379 int val = *valp;
2380 if (val < 0) {
Amerigo Wang00b7c332010-05-05 00:26:45 +00002381 *negp = true;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002382 *lvalp = (unsigned long)-val;
2383 } else {
Amerigo Wang00b7c332010-05-05 00:26:45 +00002384 *negp = false;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002385 *lvalp = (unsigned long)val;
2386 }
2387 }
2388 return 0;
2389}
2390
2391/**
2392 * proc_dointvec_minmax - read a vector of integers with min/max values
2393 * @table: the sysctl table
2394 * @write: %TRUE if this is a write to the sysctl file
Linus Torvalds1da177e2005-04-16 15:20:36 -07002395 * @buffer: the user buffer
2396 * @lenp: the size of the user buffer
2397 * @ppos: file position
2398 *
2399 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2400 * values from/to the user buffer, treated as an ASCII string.
2401 *
2402 * This routine will ensure the values are within the range specified by
2403 * table->extra1 (min) and table->extra2 (max).
2404 *
2405 * Returns 0 on success.
2406 */
Alexey Dobriyan8d65af72009-09-23 15:57:19 -07002407int proc_dointvec_minmax(struct ctl_table *table, int write,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002408 void __user *buffer, size_t *lenp, loff_t *ppos)
2409{
2410 struct do_proc_dointvec_minmax_conv_param param = {
2411 .min = (int *) table->extra1,
2412 .max = (int *) table->extra2,
2413 };
Alexey Dobriyan8d65af72009-09-23 15:57:19 -07002414 return do_proc_dointvec(table, write, buffer, lenp, ppos,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002415 do_proc_dointvec_minmax_conv, &param);
2416}
2417
Eric W. Biedermand8217f02007-10-18 03:05:22 -07002418static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002419 void __user *buffer,
2420 size_t *lenp, loff_t *ppos,
2421 unsigned long convmul,
2422 unsigned long convdiv)
2423{
Amerigo Wang00b7c332010-05-05 00:26:45 +00002424 unsigned long *i, *min, *max;
2425 int vleft, first = 1, err = 0;
2426 unsigned long page = 0;
2427 size_t left;
2428 char *kbuf;
2429
2430 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002431 *lenp = 0;
2432 return 0;
2433 }
Amerigo Wang00b7c332010-05-05 00:26:45 +00002434
Kirill Korotaevfcfbd542006-10-02 02:18:23 -07002435 i = (unsigned long *) data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002436 min = (unsigned long *) table->extra1;
2437 max = (unsigned long *) table->extra2;
2438 vleft = table->maxlen / sizeof(unsigned long);
2439 left = *lenp;
Amerigo Wang00b7c332010-05-05 00:26:45 +00002440
2441 if (write) {
2442 if (left > PAGE_SIZE - 1)
2443 left = PAGE_SIZE - 1;
2444 page = __get_free_page(GFP_TEMPORARY);
2445 kbuf = (char *) page;
2446 if (!kbuf)
2447 return -ENOMEM;
2448 if (copy_from_user(kbuf, buffer, left)) {
2449 err = -EFAULT;
2450 goto free;
2451 }
2452 kbuf[left] = 0;
2453 }
2454
Linus Torvalds1da177e2005-04-16 15:20:36 -07002455 for (; left && vleft--; i++, min++, max++, first=0) {
Amerigo Wang00b7c332010-05-05 00:26:45 +00002456 unsigned long val;
2457
Linus Torvalds1da177e2005-04-16 15:20:36 -07002458 if (write) {
Amerigo Wang00b7c332010-05-05 00:26:45 +00002459 bool neg;
2460
2461 left -= proc_skip_spaces(&kbuf);
2462
2463 err = proc_get_long(&kbuf, &left, &val, &neg,
2464 proc_wspace_sep,
2465 sizeof(proc_wspace_sep), NULL);
2466 if (err)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002467 break;
2468 if (neg)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002469 continue;
2470 if ((min && val < *min) || (max && val > *max))
2471 continue;
2472 *i = val;
2473 } else {
Amerigo Wang00b7c332010-05-05 00:26:45 +00002474 val = convdiv * (*i) / convmul;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002475 if (!first)
Amerigo Wang00b7c332010-05-05 00:26:45 +00002476 err = proc_put_char(&buffer, &left, '\t');
2477 err = proc_put_long(&buffer, &left, val, false);
2478 if (err)
2479 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002480 }
2481 }
2482
Amerigo Wang00b7c332010-05-05 00:26:45 +00002483 if (!write && !first && left && !err)
2484 err = proc_put_char(&buffer, &left, '\n');
2485 if (write && !err)
2486 left -= proc_skip_spaces(&kbuf);
2487free:
Linus Torvalds1da177e2005-04-16 15:20:36 -07002488 if (write) {
Amerigo Wang00b7c332010-05-05 00:26:45 +00002489 free_page(page);
2490 if (first)
2491 return err ? : -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002492 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002493 *lenp -= left;
2494 *ppos += *lenp;
Amerigo Wang00b7c332010-05-05 00:26:45 +00002495 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002496}
2497
Eric W. Biedermand8217f02007-10-18 03:05:22 -07002498static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
Kirill Korotaevfcfbd542006-10-02 02:18:23 -07002499 void __user *buffer,
2500 size_t *lenp, loff_t *ppos,
2501 unsigned long convmul,
2502 unsigned long convdiv)
2503{
2504 return __do_proc_doulongvec_minmax(table->data, table, write,
Alexey Dobriyan8d65af72009-09-23 15:57:19 -07002505 buffer, lenp, ppos, convmul, convdiv);
Kirill Korotaevfcfbd542006-10-02 02:18:23 -07002506}
2507
Linus Torvalds1da177e2005-04-16 15:20:36 -07002508/**
2509 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2510 * @table: the sysctl table
2511 * @write: %TRUE if this is a write to the sysctl file
Linus Torvalds1da177e2005-04-16 15:20:36 -07002512 * @buffer: the user buffer
2513 * @lenp: the size of the user buffer
2514 * @ppos: file position
2515 *
2516 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2517 * values from/to the user buffer, treated as an ASCII string.
2518 *
2519 * This routine will ensure the values are within the range specified by
2520 * table->extra1 (min) and table->extra2 (max).
2521 *
2522 * Returns 0 on success.
2523 */
Alexey Dobriyan8d65af72009-09-23 15:57:19 -07002524int proc_doulongvec_minmax(struct ctl_table *table, int write,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002525 void __user *buffer, size_t *lenp, loff_t *ppos)
2526{
Alexey Dobriyan8d65af72009-09-23 15:57:19 -07002527 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002528}
2529
2530/**
2531 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2532 * @table: the sysctl table
2533 * @write: %TRUE if this is a write to the sysctl file
Linus Torvalds1da177e2005-04-16 15:20:36 -07002534 * @buffer: the user buffer
2535 * @lenp: the size of the user buffer
2536 * @ppos: file position
2537 *
2538 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2539 * values from/to the user buffer, treated as an ASCII string. The values
2540 * are treated as milliseconds, and converted to jiffies when they are stored.
2541 *
2542 * This routine will ensure the values are within the range specified by
2543 * table->extra1 (min) and table->extra2 (max).
2544 *
2545 * Returns 0 on success.
2546 */
Eric W. Biedermand8217f02007-10-18 03:05:22 -07002547int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002548 void __user *buffer,
2549 size_t *lenp, loff_t *ppos)
2550{
Alexey Dobriyan8d65af72009-09-23 15:57:19 -07002551 return do_proc_doulongvec_minmax(table, write, buffer,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002552 lenp, ppos, HZ, 1000l);
2553}
2554
2555
Amerigo Wang00b7c332010-05-05 00:26:45 +00002556static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002557 int *valp,
2558 int write, void *data)
2559{
2560 if (write) {
Bart Samwelcba9f332006-03-24 03:15:50 -08002561 if (*lvalp > LONG_MAX / HZ)
2562 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002563 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2564 } else {
2565 int val = *valp;
2566 unsigned long lval;
2567 if (val < 0) {
Amerigo Wang00b7c332010-05-05 00:26:45 +00002568 *negp = true;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002569 lval = (unsigned long)-val;
2570 } else {
Amerigo Wang00b7c332010-05-05 00:26:45 +00002571 *negp = false;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002572 lval = (unsigned long)val;
2573 }
2574 *lvalp = lval / HZ;
2575 }
2576 return 0;
2577}
2578
Amerigo Wang00b7c332010-05-05 00:26:45 +00002579static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002580 int *valp,
2581 int write, void *data)
2582{
2583 if (write) {
Bart Samwelcba9f332006-03-24 03:15:50 -08002584 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2585 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002586 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2587 } else {
2588 int val = *valp;
2589 unsigned long lval;
2590 if (val < 0) {
Amerigo Wang00b7c332010-05-05 00:26:45 +00002591 *negp = true;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002592 lval = (unsigned long)-val;
2593 } else {
Amerigo Wang00b7c332010-05-05 00:26:45 +00002594 *negp = false;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002595 lval = (unsigned long)val;
2596 }
2597 *lvalp = jiffies_to_clock_t(lval);
2598 }
2599 return 0;
2600}
2601
Amerigo Wang00b7c332010-05-05 00:26:45 +00002602static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002603 int *valp,
2604 int write, void *data)
2605{
2606 if (write) {
2607 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2608 } else {
2609 int val = *valp;
2610 unsigned long lval;
2611 if (val < 0) {
Amerigo Wang00b7c332010-05-05 00:26:45 +00002612 *negp = true;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002613 lval = (unsigned long)-val;
2614 } else {
Amerigo Wang00b7c332010-05-05 00:26:45 +00002615 *negp = false;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002616 lval = (unsigned long)val;
2617 }
2618 *lvalp = jiffies_to_msecs(lval);
2619 }
2620 return 0;
2621}
2622
2623/**
2624 * proc_dointvec_jiffies - read a vector of integers as seconds
2625 * @table: the sysctl table
2626 * @write: %TRUE if this is a write to the sysctl file
Linus Torvalds1da177e2005-04-16 15:20:36 -07002627 * @buffer: the user buffer
2628 * @lenp: the size of the user buffer
2629 * @ppos: file position
2630 *
2631 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2632 * values from/to the user buffer, treated as an ASCII string.
2633 * The values read are assumed to be in seconds, and are converted into
2634 * jiffies.
2635 *
2636 * Returns 0 on success.
2637 */
Alexey Dobriyan8d65af72009-09-23 15:57:19 -07002638int proc_dointvec_jiffies(struct ctl_table *table, int write,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002639 void __user *buffer, size_t *lenp, loff_t *ppos)
2640{
Alexey Dobriyan8d65af72009-09-23 15:57:19 -07002641 return do_proc_dointvec(table,write,buffer,lenp,ppos,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002642 do_proc_dointvec_jiffies_conv,NULL);
2643}
2644
2645/**
2646 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2647 * @table: the sysctl table
2648 * @write: %TRUE if this is a write to the sysctl file
Linus Torvalds1da177e2005-04-16 15:20:36 -07002649 * @buffer: the user buffer
2650 * @lenp: the size of the user buffer
Randy Dunlap1e5d5332005-11-07 01:01:06 -08002651 * @ppos: pointer to the file position
Linus Torvalds1da177e2005-04-16 15:20:36 -07002652 *
2653 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2654 * values from/to the user buffer, treated as an ASCII string.
2655 * The values read are assumed to be in 1/USER_HZ seconds, and
2656 * are converted into jiffies.
2657 *
2658 * Returns 0 on success.
2659 */
Alexey Dobriyan8d65af72009-09-23 15:57:19 -07002660int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002661 void __user *buffer, size_t *lenp, loff_t *ppos)
2662{
Alexey Dobriyan8d65af72009-09-23 15:57:19 -07002663 return do_proc_dointvec(table,write,buffer,lenp,ppos,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002664 do_proc_dointvec_userhz_jiffies_conv,NULL);
2665}
2666
2667/**
2668 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2669 * @table: the sysctl table
2670 * @write: %TRUE if this is a write to the sysctl file
Linus Torvalds1da177e2005-04-16 15:20:36 -07002671 * @buffer: the user buffer
2672 * @lenp: the size of the user buffer
Martin Waitz67be2dd2005-05-01 08:59:26 -07002673 * @ppos: file position
2674 * @ppos: the current position in the file
Linus Torvalds1da177e2005-04-16 15:20:36 -07002675 *
2676 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2677 * values from/to the user buffer, treated as an ASCII string.
2678 * The values read are assumed to be in 1/1000 seconds, and
2679 * are converted into jiffies.
2680 *
2681 * Returns 0 on success.
2682 */
Alexey Dobriyan8d65af72009-09-23 15:57:19 -07002683int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002684 void __user *buffer, size_t *lenp, loff_t *ppos)
2685{
Alexey Dobriyan8d65af72009-09-23 15:57:19 -07002686 return do_proc_dointvec(table, write, buffer, lenp, ppos,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002687 do_proc_dointvec_ms_jiffies_conv, NULL);
2688}
2689
Alexey Dobriyan8d65af72009-09-23 15:57:19 -07002690static int proc_do_cad_pid(struct ctl_table *table, int write,
Cedric Le Goater9ec52092006-10-02 02:19:00 -07002691 void __user *buffer, size_t *lenp, loff_t *ppos)
2692{
2693 struct pid *new_pid;
2694 pid_t tmp;
2695 int r;
2696
Pavel Emelyanov6c5f3e72008-02-08 04:19:20 -08002697 tmp = pid_vnr(cad_pid);
Cedric Le Goater9ec52092006-10-02 02:19:00 -07002698
Alexey Dobriyan8d65af72009-09-23 15:57:19 -07002699 r = __do_proc_dointvec(&tmp, table, write, buffer,
Cedric Le Goater9ec52092006-10-02 02:19:00 -07002700 lenp, ppos, NULL, NULL);
2701 if (r || !write)
2702 return r;
2703
2704 new_pid = find_get_pid(tmp);
2705 if (!new_pid)
2706 return -ESRCH;
2707
2708 put_pid(xchg(&cad_pid, new_pid));
2709 return 0;
2710}
2711
Octavian Purdila9f977fb2010-05-05 00:26:55 +00002712/**
2713 * proc_do_large_bitmap - read/write from/to a large bitmap
2714 * @table: the sysctl table
2715 * @write: %TRUE if this is a write to the sysctl file
2716 * @buffer: the user buffer
2717 * @lenp: the size of the user buffer
2718 * @ppos: file position
2719 *
2720 * The bitmap is stored at table->data and the bitmap length (in bits)
2721 * in table->maxlen.
2722 *
2723 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2724 * large bitmaps may be represented in a compact manner. Writing into
2725 * the file will clear the bitmap then update it with the given input.
2726 *
2727 * Returns 0 on success.
2728 */
2729int proc_do_large_bitmap(struct ctl_table *table, int write,
2730 void __user *buffer, size_t *lenp, loff_t *ppos)
2731{
2732 int err = 0;
2733 bool first = 1;
2734 size_t left = *lenp;
2735 unsigned long bitmap_len = table->maxlen;
2736 unsigned long *bitmap = (unsigned long *) table->data;
2737 unsigned long *tmp_bitmap = NULL;
2738 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2739
2740 if (!bitmap_len || !left || (*ppos && !write)) {
2741 *lenp = 0;
2742 return 0;
2743 }
2744
2745 if (write) {
2746 unsigned long page = 0;
2747 char *kbuf;
2748
2749 if (left > PAGE_SIZE - 1)
2750 left = PAGE_SIZE - 1;
2751
2752 page = __get_free_page(GFP_TEMPORARY);
2753 kbuf = (char *) page;
2754 if (!kbuf)
2755 return -ENOMEM;
2756 if (copy_from_user(kbuf, buffer, left)) {
2757 free_page(page);
2758 return -EFAULT;
2759 }
2760 kbuf[left] = 0;
2761
2762 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
2763 GFP_KERNEL);
2764 if (!tmp_bitmap) {
2765 free_page(page);
2766 return -ENOMEM;
2767 }
2768 proc_skip_char(&kbuf, &left, '\n');
2769 while (!err && left) {
2770 unsigned long val_a, val_b;
2771 bool neg;
2772
2773 err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a,
2774 sizeof(tr_a), &c);
2775 if (err)
2776 break;
2777 if (val_a >= bitmap_len || neg) {
2778 err = -EINVAL;
2779 break;
2780 }
2781
2782 val_b = val_a;
2783 if (left) {
2784 kbuf++;
2785 left--;
2786 }
2787
2788 if (c == '-') {
2789 err = proc_get_long(&kbuf, &left, &val_b,
2790 &neg, tr_b, sizeof(tr_b),
2791 &c);
2792 if (err)
2793 break;
2794 if (val_b >= bitmap_len || neg ||
2795 val_a > val_b) {
2796 err = -EINVAL;
2797 break;
2798 }
2799 if (left) {
2800 kbuf++;
2801 left--;
2802 }
2803 }
2804
2805 while (val_a <= val_b)
2806 set_bit(val_a++, tmp_bitmap);
2807
2808 first = 0;
2809 proc_skip_char(&kbuf, &left, '\n');
2810 }
2811 free_page(page);
2812 } else {
2813 unsigned long bit_a, bit_b = 0;
2814
2815 while (left) {
2816 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
2817 if (bit_a >= bitmap_len)
2818 break;
2819 bit_b = find_next_zero_bit(bitmap, bitmap_len,
2820 bit_a + 1) - 1;
2821
2822 if (!first) {
2823 err = proc_put_char(&buffer, &left, ',');
2824 if (err)
2825 break;
2826 }
2827 err = proc_put_long(&buffer, &left, bit_a, false);
2828 if (err)
2829 break;
2830 if (bit_a != bit_b) {
2831 err = proc_put_char(&buffer, &left, '-');
2832 if (err)
2833 break;
2834 err = proc_put_long(&buffer, &left, bit_b, false);
2835 if (err)
2836 break;
2837 }
2838
2839 first = 0; bit_b++;
2840 }
2841 if (!err)
2842 err = proc_put_char(&buffer, &left, '\n');
2843 }
2844
2845 if (!err) {
2846 if (write) {
2847 if (*ppos)
2848 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
2849 else
2850 memcpy(bitmap, tmp_bitmap,
2851 BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long));
2852 }
2853 kfree(tmp_bitmap);
2854 *lenp -= left;
2855 *ppos += *lenp;
2856 return 0;
2857 } else {
2858 kfree(tmp_bitmap);
2859 return err;
2860 }
2861}
2862
Linus Torvalds1da177e2005-04-16 15:20:36 -07002863#else /* CONFIG_PROC_FS */
2864
Alexey Dobriyan8d65af72009-09-23 15:57:19 -07002865int proc_dostring(struct ctl_table *table, int write,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002866 void __user *buffer, size_t *lenp, loff_t *ppos)
2867{
2868 return -ENOSYS;
2869}
2870
Alexey Dobriyan8d65af72009-09-23 15:57:19 -07002871int proc_dointvec(struct ctl_table *table, int write,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002872 void __user *buffer, size_t *lenp, loff_t *ppos)
2873{
2874 return -ENOSYS;
2875}
2876
Alexey Dobriyan8d65af72009-09-23 15:57:19 -07002877int proc_dointvec_minmax(struct ctl_table *table, int write,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002878 void __user *buffer, size_t *lenp, loff_t *ppos)
2879{
2880 return -ENOSYS;
2881}
2882
Alexey Dobriyan8d65af72009-09-23 15:57:19 -07002883int proc_dointvec_jiffies(struct ctl_table *table, int write,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002884 void __user *buffer, size_t *lenp, loff_t *ppos)
2885{
2886 return -ENOSYS;
2887}
2888
Alexey Dobriyan8d65af72009-09-23 15:57:19 -07002889int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002890 void __user *buffer, size_t *lenp, loff_t *ppos)
2891{
2892 return -ENOSYS;
2893}
2894
Alexey Dobriyan8d65af72009-09-23 15:57:19 -07002895int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002896 void __user *buffer, size_t *lenp, loff_t *ppos)
2897{
2898 return -ENOSYS;
2899}
2900
Alexey Dobriyan8d65af72009-09-23 15:57:19 -07002901int proc_doulongvec_minmax(struct ctl_table *table, int write,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002902 void __user *buffer, size_t *lenp, loff_t *ppos)
2903{
2904 return -ENOSYS;
2905}
2906
Eric W. Biedermand8217f02007-10-18 03:05:22 -07002907int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002908 void __user *buffer,
2909 size_t *lenp, loff_t *ppos)
2910{
2911 return -ENOSYS;
2912}
2913
2914
2915#endif /* CONFIG_PROC_FS */
2916
Linus Torvalds1da177e2005-04-16 15:20:36 -07002917/*
2918 * No sense putting this after each symbol definition, twice,
2919 * exception granted :-)
2920 */
2921EXPORT_SYMBOL(proc_dointvec);
2922EXPORT_SYMBOL(proc_dointvec_jiffies);
2923EXPORT_SYMBOL(proc_dointvec_minmax);
2924EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2925EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2926EXPORT_SYMBOL(proc_dostring);
2927EXPORT_SYMBOL(proc_doulongvec_minmax);
2928EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
2929EXPORT_SYMBOL(register_sysctl_table);
Eric W. Biederman29e796f2007-11-30 23:50:18 +11002930EXPORT_SYMBOL(register_sysctl_paths);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002931EXPORT_SYMBOL(unregister_sysctl_table);