Root/kernel/sysctl.c

1/*
2 * sysctl.c: General linux system control interface
3 *
4 * Begun 24 March 1995, Stephen Tweedie
5 * Added /proc support, Dec 1995
6 * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
7 * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
8 * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
9 * Dynamic registration fixes, Stephen Tweedie.
10 * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
11 * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
12 * Horn.
13 * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
14 * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
15 * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
16 * Wendling.
17 * The list_for_each() macro wasn't appropriate for the sysctl loop.
18 * Removed it and replaced it with older style, 03/23/00, Bill Wendling
19 */
20
21#include <linux/module.h>
22#include <linux/mm.h>
23#include <linux/swap.h>
24#include <linux/slab.h>
25#include <linux/sysctl.h>
26#include <linux/bitmap.h>
27#include <linux/signal.h>
28#include <linux/printk.h>
29#include <linux/proc_fs.h>
30#include <linux/security.h>
31#include <linux/ctype.h>
32#include <linux/kmemcheck.h>
33#include <linux/kmemleak.h>
34#include <linux/fs.h>
35#include <linux/init.h>
36#include <linux/kernel.h>
37#include <linux/kobject.h>
38#include <linux/net.h>
39#include <linux/sysrq.h>
40#include <linux/highuid.h>
41#include <linux/writeback.h>
42#include <linux/ratelimit.h>
43#include <linux/compaction.h>
44#include <linux/hugetlb.h>
45#include <linux/initrd.h>
46#include <linux/key.h>
47#include <linux/times.h>
48#include <linux/limits.h>
49#include <linux/dcache.h>
50#include <linux/dnotify.h>
51#include <linux/syscalls.h>
52#include <linux/vmstat.h>
53#include <linux/nfs_fs.h>
54#include <linux/acpi.h>
55#include <linux/reboot.h>
56#include <linux/ftrace.h>
57#include <linux/perf_event.h>
58#include <linux/kprobes.h>
59#include <linux/pipe_fs_i.h>
60#include <linux/oom.h>
61#include <linux/kmod.h>
62#include <linux/capability.h>
63#include <linux/binfmts.h>
64#include <linux/sched/sysctl.h>
65#include <linux/kexec.h>
66
67#include <asm/uaccess.h>
68#include <asm/processor.h>
69
70#ifdef CONFIG_X86
71#include <asm/nmi.h>
72#include <asm/stacktrace.h>
73#include <asm/io.h>
74#endif
75#ifdef CONFIG_SPARC
76#include <asm/setup.h>
77#endif
78#ifdef CONFIG_BSD_PROCESS_ACCT
79#include <linux/acct.h>
80#endif
81#ifdef CONFIG_RT_MUTEXES
82#include <linux/rtmutex.h>
83#endif
84#if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
85#include <linux/lockdep.h>
86#endif
87#ifdef CONFIG_CHR_DEV_SG
88#include <scsi/sg.h>
89#endif
90
91#ifdef CONFIG_LOCKUP_DETECTOR
92#include <linux/nmi.h>
93#endif
94
95
96#if defined(CONFIG_SYSCTL)
97
98/* External variables not in a header file. */
99extern int max_threads;
100extern int suid_dumpable;
101#ifdef CONFIG_COREDUMP
102extern int core_uses_pid;
103extern char core_pattern[];
104extern unsigned int core_pipe_limit;
105#endif
106extern int pid_max;
107extern int pid_max_min, pid_max_max;
108extern int percpu_pagelist_fraction;
109extern int compat_log;
110extern int latencytop_enabled;
111extern int sysctl_nr_open_min, sysctl_nr_open_max;
112#ifndef CONFIG_MMU
113extern int sysctl_nr_trim_pages;
114#endif
115
116/* Constants used for minimum and maximum */
117#ifdef CONFIG_LOCKUP_DETECTOR
118static int sixty = 60;
119#endif
120
121static int __maybe_unused neg_one = -1;
122
123static int zero;
124static int __maybe_unused one = 1;
125static int __maybe_unused two = 2;
126static int __maybe_unused four = 4;
127static unsigned long one_ul = 1;
128static int one_hundred = 100;
129#ifdef CONFIG_PRINTK
130static int ten_thousand = 10000;
131#endif
132
133/* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
134static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
135
136/* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
137static int maxolduid = 65535;
138static int minolduid;
139static int min_percpu_pagelist_fract = 8;
140
141static int ngroups_max = NGROUPS_MAX;
142static const int cap_last_cap = CAP_LAST_CAP;
143
144/*this is needed for proc_doulongvec_minmax of sysctl_hung_task_timeout_secs */
145#ifdef CONFIG_DETECT_HUNG_TASK
146static unsigned long hung_task_timeout_max = (LONG_MAX/HZ);
147#endif
148
149#ifdef CONFIG_INOTIFY_USER
150#include <linux/inotify.h>
151#endif
152#ifdef CONFIG_SPARC
153#endif
154
155#ifdef CONFIG_SPARC64
156extern int sysctl_tsb_ratio;
157#endif
158
159#ifdef __hppa__
160extern int pwrsw_enabled;
161#endif
162
163#ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
164extern int unaligned_enabled;
165#endif
166
167#ifdef CONFIG_IA64
168extern int unaligned_dump_stack;
169#endif
170
171#ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
172extern int no_unaligned_warning;
173#endif
174
175#ifdef CONFIG_PROC_SYSCTL
176static int proc_do_cad_pid(struct ctl_table *table, int write,
177          void __user *buffer, size_t *lenp, loff_t *ppos);
178static int proc_taint(struct ctl_table *table, int write,
179                   void __user *buffer, size_t *lenp, loff_t *ppos);
180#endif
181
182#ifdef CONFIG_PRINTK
183static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
184                void __user *buffer, size_t *lenp, loff_t *ppos);
185#endif
186
187static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
188        void __user *buffer, size_t *lenp, loff_t *ppos);
189#ifdef CONFIG_COREDUMP
190static int proc_dostring_coredump(struct ctl_table *table, int write,
191        void __user *buffer, size_t *lenp, loff_t *ppos);
192#endif
193
194#ifdef CONFIG_MAGIC_SYSRQ
195/* Note: sysrq code uses it's own private copy */
196static int __sysrq_enabled = CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE;
197
198static int sysrq_sysctl_handler(ctl_table *table, int write,
199                void __user *buffer, size_t *lenp,
200                loff_t *ppos)
201{
202    int error;
203
204    error = proc_dointvec(table, write, buffer, lenp, ppos);
205    if (error)
206        return error;
207
208    if (write)
209        sysrq_toggle_support(__sysrq_enabled);
210
211    return 0;
212}
213
214#endif
215
216static struct ctl_table kern_table[];
217static struct ctl_table vm_table[];
218static struct ctl_table fs_table[];
219static struct ctl_table debug_table[];
220static struct ctl_table dev_table[];
221extern struct ctl_table random_table[];
222#ifdef CONFIG_EPOLL
223extern struct ctl_table epoll_table[];
224#endif
225
226#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
227int sysctl_legacy_va_layout;
228#endif
229
230/* The default sysctl tables: */
231
232static struct ctl_table sysctl_base_table[] = {
233    {
234        .procname = "kernel",
235        .mode = 0555,
236        .child = kern_table,
237    },
238    {
239        .procname = "vm",
240        .mode = 0555,
241        .child = vm_table,
242    },
243    {
244        .procname = "fs",
245        .mode = 0555,
246        .child = fs_table,
247    },
248    {
249        .procname = "debug",
250        .mode = 0555,
251        .child = debug_table,
252    },
253    {
254        .procname = "dev",
255        .mode = 0555,
256        .child = dev_table,
257    },
258    { }
259};
260
261#ifdef CONFIG_SCHED_DEBUG
262static int min_sched_granularity_ns = 100000; /* 100 usecs */
263static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
264static int min_wakeup_granularity_ns; /* 0 usecs */
265static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
266#ifdef CONFIG_SMP
267static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
268static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
269#endif /* CONFIG_SMP */
270#endif /* CONFIG_SCHED_DEBUG */
271
272#ifdef CONFIG_COMPACTION
273static int min_extfrag_threshold;
274static int max_extfrag_threshold = 1000;
275#endif
276
277static struct ctl_table kern_table[] = {
278    {
279        .procname = "sched_child_runs_first",
280        .data = &sysctl_sched_child_runs_first,
281        .maxlen = sizeof(unsigned int),
282        .mode = 0644,
283        .proc_handler = proc_dointvec,
284    },
285#ifdef CONFIG_SCHED_DEBUG
286    {
287        .procname = "sched_min_granularity_ns",
288        .data = &sysctl_sched_min_granularity,
289        .maxlen = sizeof(unsigned int),
290        .mode = 0644,
291        .proc_handler = sched_proc_update_handler,
292        .extra1 = &min_sched_granularity_ns,
293        .extra2 = &max_sched_granularity_ns,
294    },
295    {
296        .procname = "sched_latency_ns",
297        .data = &sysctl_sched_latency,
298        .maxlen = sizeof(unsigned int),
299        .mode = 0644,
300        .proc_handler = sched_proc_update_handler,
301        .extra1 = &min_sched_granularity_ns,
302        .extra2 = &max_sched_granularity_ns,
303    },
304    {
305        .procname = "sched_wakeup_granularity_ns",
306        .data = &sysctl_sched_wakeup_granularity,
307        .maxlen = sizeof(unsigned int),
308        .mode = 0644,
309        .proc_handler = sched_proc_update_handler,
310        .extra1 = &min_wakeup_granularity_ns,
311        .extra2 = &max_wakeup_granularity_ns,
312    },
313#ifdef CONFIG_SMP
314    {
315        .procname = "sched_tunable_scaling",
316        .data = &sysctl_sched_tunable_scaling,
317        .maxlen = sizeof(enum sched_tunable_scaling),
318        .mode = 0644,
319        .proc_handler = sched_proc_update_handler,
320        .extra1 = &min_sched_tunable_scaling,
321        .extra2 = &max_sched_tunable_scaling,
322    },
323    {
324        .procname = "sched_migration_cost_ns",
325        .data = &sysctl_sched_migration_cost,
326        .maxlen = sizeof(unsigned int),
327        .mode = 0644,
328        .proc_handler = proc_dointvec,
329    },
330    {
331        .procname = "sched_nr_migrate",
332        .data = &sysctl_sched_nr_migrate,
333        .maxlen = sizeof(unsigned int),
334        .mode = 0644,
335        .proc_handler = proc_dointvec,
336    },
337    {
338        .procname = "sched_time_avg_ms",
339        .data = &sysctl_sched_time_avg,
340        .maxlen = sizeof(unsigned int),
341        .mode = 0644,
342        .proc_handler = proc_dointvec,
343    },
344    {
345        .procname = "sched_shares_window_ns",
346        .data = &sysctl_sched_shares_window,
347        .maxlen = sizeof(unsigned int),
348        .mode = 0644,
349        .proc_handler = proc_dointvec,
350    },
351    {
352        .procname = "timer_migration",
353        .data = &sysctl_timer_migration,
354        .maxlen = sizeof(unsigned int),
355        .mode = 0644,
356        .proc_handler = proc_dointvec_minmax,
357        .extra1 = &zero,
358        .extra2 = &one,
359    },
360#endif /* CONFIG_SMP */
361#ifdef CONFIG_NUMA_BALANCING
362    {
363        .procname = "numa_balancing_scan_delay_ms",
364        .data = &sysctl_numa_balancing_scan_delay,
365        .maxlen = sizeof(unsigned int),
366        .mode = 0644,
367        .proc_handler = proc_dointvec,
368    },
369    {
370        .procname = "numa_balancing_scan_period_min_ms",
371        .data = &sysctl_numa_balancing_scan_period_min,
372        .maxlen = sizeof(unsigned int),
373        .mode = 0644,
374        .proc_handler = proc_dointvec,
375    },
376    {
377        .procname = "numa_balancing_scan_period_max_ms",
378        .data = &sysctl_numa_balancing_scan_period_max,
379        .maxlen = sizeof(unsigned int),
380        .mode = 0644,
381        .proc_handler = proc_dointvec,
382    },
383    {
384        .procname = "numa_balancing_scan_size_mb",
385        .data = &sysctl_numa_balancing_scan_size,
386        .maxlen = sizeof(unsigned int),
387        .mode = 0644,
388        .proc_handler = proc_dointvec,
389    },
390    {
391        .procname = "numa_balancing",
392        .data = NULL, /* filled in by handler */
393        .maxlen = sizeof(unsigned int),
394        .mode = 0644,
395        .proc_handler = sysctl_numa_balancing,
396        .extra1 = &zero,
397        .extra2 = &one,
398    },
399#endif /* CONFIG_NUMA_BALANCING */
400#endif /* CONFIG_SCHED_DEBUG */
401    {
402        .procname = "sched_rt_period_us",
403        .data = &sysctl_sched_rt_period,
404        .maxlen = sizeof(unsigned int),
405        .mode = 0644,
406        .proc_handler = sched_rt_handler,
407    },
408    {
409        .procname = "sched_rt_runtime_us",
410        .data = &sysctl_sched_rt_runtime,
411        .maxlen = sizeof(int),
412        .mode = 0644,
413        .proc_handler = sched_rt_handler,
414    },
415    {
416        .procname = "sched_rr_timeslice_ms",
417        .data = &sched_rr_timeslice,
418        .maxlen = sizeof(int),
419        .mode = 0644,
420        .proc_handler = sched_rr_handler,
421    },
422#ifdef CONFIG_SCHED_AUTOGROUP
423    {
424        .procname = "sched_autogroup_enabled",
425        .data = &sysctl_sched_autogroup_enabled,
426        .maxlen = sizeof(unsigned int),
427        .mode = 0644,
428        .proc_handler = proc_dointvec_minmax,
429        .extra1 = &zero,
430        .extra2 = &one,
431    },
432#endif
433#ifdef CONFIG_CFS_BANDWIDTH
434    {
435        .procname = "sched_cfs_bandwidth_slice_us",
436        .data = &sysctl_sched_cfs_bandwidth_slice,
437        .maxlen = sizeof(unsigned int),
438        .mode = 0644,
439        .proc_handler = proc_dointvec_minmax,
440        .extra1 = &one,
441    },
442#endif
443#ifdef CONFIG_PROVE_LOCKING
444    {
445        .procname = "prove_locking",
446        .data = &prove_locking,
447        .maxlen = sizeof(int),
448        .mode = 0644,
449        .proc_handler = proc_dointvec,
450    },
451#endif
452#ifdef CONFIG_LOCK_STAT
453    {
454        .procname = "lock_stat",
455        .data = &lock_stat,
456        .maxlen = sizeof(int),
457        .mode = 0644,
458        .proc_handler = proc_dointvec,
459    },
460#endif
461    {
462        .procname = "panic",
463        .data = &panic_timeout,
464        .maxlen = sizeof(int),
465        .mode = 0644,
466        .proc_handler = proc_dointvec,
467    },
468#ifdef CONFIG_COREDUMP
469    {
470        .procname = "core_uses_pid",
471        .data = &core_uses_pid,
472        .maxlen = sizeof(int),
473        .mode = 0644,
474        .proc_handler = proc_dointvec,
475    },
476    {
477        .procname = "core_pattern",
478        .data = core_pattern,
479        .maxlen = CORENAME_MAX_SIZE,
480        .mode = 0644,
481        .proc_handler = proc_dostring_coredump,
482    },
483    {
484        .procname = "core_pipe_limit",
485        .data = &core_pipe_limit,
486        .maxlen = sizeof(unsigned int),
487        .mode = 0644,
488        .proc_handler = proc_dointvec,
489    },
490#endif
491#ifdef CONFIG_PROC_SYSCTL
492    {
493        .procname = "tainted",
494        .maxlen = sizeof(long),
495        .mode = 0644,
496        .proc_handler = proc_taint,
497    },
498#endif
499#ifdef CONFIG_LATENCYTOP
500    {
501        .procname = "latencytop",
502        .data = &latencytop_enabled,
503        .maxlen = sizeof(int),
504        .mode = 0644,
505        .proc_handler = proc_dointvec,
506    },
507#endif
508#ifdef CONFIG_BLK_DEV_INITRD
509    {
510        .procname = "real-root-dev",
511        .data = &real_root_dev,
512        .maxlen = sizeof(int),
513        .mode = 0644,
514        .proc_handler = proc_dointvec,
515    },
516#endif
517    {
518        .procname = "print-fatal-signals",
519        .data = &print_fatal_signals,
520        .maxlen = sizeof(int),
521        .mode = 0644,
522        .proc_handler = proc_dointvec,
523    },
524#ifdef CONFIG_SPARC
525    {
526        .procname = "reboot-cmd",
527        .data = reboot_command,
528        .maxlen = 256,
529        .mode = 0644,
530        .proc_handler = proc_dostring,
531    },
532    {
533        .procname = "stop-a",
534        .data = &stop_a_enabled,
535        .maxlen = sizeof (int),
536        .mode = 0644,
537        .proc_handler = proc_dointvec,
538    },
539    {
540        .procname = "scons-poweroff",
541        .data = &scons_pwroff,
542        .maxlen = sizeof (int),
543        .mode = 0644,
544        .proc_handler = proc_dointvec,
545    },
546#endif
547#ifdef CONFIG_SPARC64
548    {
549        .procname = "tsb-ratio",
550        .data = &sysctl_tsb_ratio,
551        .maxlen = sizeof (int),
552        .mode = 0644,
553        .proc_handler = proc_dointvec,
554    },
555#endif
556#ifdef __hppa__
557    {
558        .procname = "soft-power",
559        .data = &pwrsw_enabled,
560        .maxlen = sizeof (int),
561         .mode = 0644,
562        .proc_handler = proc_dointvec,
563    },
564#endif
565#ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
566    {
567        .procname = "unaligned-trap",
568        .data = &unaligned_enabled,
569        .maxlen = sizeof (int),
570        .mode = 0644,
571        .proc_handler = proc_dointvec,
572    },
573#endif
574    {
575        .procname = "ctrl-alt-del",
576        .data = &C_A_D,
577        .maxlen = sizeof(int),
578        .mode = 0644,
579        .proc_handler = proc_dointvec,
580    },
581#ifdef CONFIG_FUNCTION_TRACER
582    {
583        .procname = "ftrace_enabled",
584        .data = &ftrace_enabled,
585        .maxlen = sizeof(int),
586        .mode = 0644,
587        .proc_handler = ftrace_enable_sysctl,
588    },
589#endif
590#ifdef CONFIG_STACK_TRACER
591    {
592        .procname = "stack_tracer_enabled",
593        .data = &stack_tracer_enabled,
594        .maxlen = sizeof(int),
595        .mode = 0644,
596        .proc_handler = stack_trace_sysctl,
597    },
598#endif
599#ifdef CONFIG_TRACING
600    {
601        .procname = "ftrace_dump_on_oops",
602        .data = &ftrace_dump_on_oops,
603        .maxlen = sizeof(int),
604        .mode = 0644,
605        .proc_handler = proc_dointvec,
606    },
607    {
608        .procname = "traceoff_on_warning",
609        .data = &__disable_trace_on_warning,
610        .maxlen = sizeof(__disable_trace_on_warning),
611        .mode = 0644,
612        .proc_handler = proc_dointvec,
613    },
614#endif
615#ifdef CONFIG_KEXEC
616    {
617        .procname = "kexec_load_disabled",
618        .data = &kexec_load_disabled,
619        .maxlen = sizeof(int),
620        .mode = 0644,
621        /* only handle a transition from default "0" to "1" */
622        .proc_handler = proc_dointvec_minmax,
623        .extra1 = &one,
624        .extra2 = &one,
625    },
626#endif
627#ifdef CONFIG_MODULES
628    {
629        .procname = "modprobe",
630        .data = &modprobe_path,
631        .maxlen = KMOD_PATH_LEN,
632        .mode = 0644,
633        .proc_handler = proc_dostring,
634    },
635    {
636        .procname = "modules_disabled",
637        .data = &modules_disabled,
638        .maxlen = sizeof(int),
639        .mode = 0644,
640        /* only handle a transition from default "0" to "1" */
641        .proc_handler = proc_dointvec_minmax,
642        .extra1 = &one,
643        .extra2 = &one,
644    },
645#endif
646
647    {
648        .procname = "hotplug",
649        .data = &uevent_helper,
650        .maxlen = UEVENT_HELPER_PATH_LEN,
651        .mode = 0644,
652        .proc_handler = proc_dostring,
653    },
654
655#ifdef CONFIG_CHR_DEV_SG
656    {
657        .procname = "sg-big-buff",
658        .data = &sg_big_buff,
659        .maxlen = sizeof (int),
660        .mode = 0444,
661        .proc_handler = proc_dointvec,
662    },
663#endif
664#ifdef CONFIG_BSD_PROCESS_ACCT
665    {
666        .procname = "acct",
667        .data = &acct_parm,
668        .maxlen = 3*sizeof(int),
669        .mode = 0644,
670        .proc_handler = proc_dointvec,
671    },
672#endif
673#ifdef CONFIG_MAGIC_SYSRQ
674    {
675        .procname = "sysrq",
676        .data = &__sysrq_enabled,
677        .maxlen = sizeof (int),
678        .mode = 0644,
679        .proc_handler = sysrq_sysctl_handler,
680    },
681#endif
682#ifdef CONFIG_PROC_SYSCTL
683    {
684        .procname = "cad_pid",
685        .data = NULL,
686        .maxlen = sizeof (int),
687        .mode = 0600,
688        .proc_handler = proc_do_cad_pid,
689    },
690#endif
691    {
692        .procname = "threads-max",
693        .data = &max_threads,
694        .maxlen = sizeof(int),
695        .mode = 0644,
696        .proc_handler = proc_dointvec,
697    },
698    {
699        .procname = "random",
700        .mode = 0555,
701        .child = random_table,
702    },
703    {
704        .procname = "usermodehelper",
705        .mode = 0555,
706        .child = usermodehelper_table,
707    },
708    {
709        .procname = "overflowuid",
710        .data = &overflowuid,
711        .maxlen = sizeof(int),
712        .mode = 0644,
713        .proc_handler = proc_dointvec_minmax,
714        .extra1 = &minolduid,
715        .extra2 = &maxolduid,
716    },
717    {
718        .procname = "overflowgid",
719        .data = &overflowgid,
720        .maxlen = sizeof(int),
721        .mode = 0644,
722        .proc_handler = proc_dointvec_minmax,
723        .extra1 = &minolduid,
724        .extra2 = &maxolduid,
725    },
726#ifdef CONFIG_S390
727#ifdef CONFIG_MATHEMU
728    {
729        .procname = "ieee_emulation_warnings",
730        .data = &sysctl_ieee_emulation_warnings,
731        .maxlen = sizeof(int),
732        .mode = 0644,
733        .proc_handler = proc_dointvec,
734    },
735#endif
736    {
737        .procname = "userprocess_debug",
738        .data = &show_unhandled_signals,
739        .maxlen = sizeof(int),
740        .mode = 0644,
741        .proc_handler = proc_dointvec,
742    },
743#endif
744    {
745        .procname = "pid_max",
746        .data = &pid_max,
747        .maxlen = sizeof (int),
748        .mode = 0644,
749        .proc_handler = proc_dointvec_minmax,
750        .extra1 = &pid_max_min,
751        .extra2 = &pid_max_max,
752    },
753    {
754        .procname = "panic_on_oops",
755        .data = &panic_on_oops,
756        .maxlen = sizeof(int),
757        .mode = 0644,
758        .proc_handler = proc_dointvec,
759    },
760#if defined CONFIG_PRINTK
761    {
762        .procname = "printk",
763        .data = &console_loglevel,
764        .maxlen = 4*sizeof(int),
765        .mode = 0644,
766        .proc_handler = proc_dointvec,
767    },
768    {
769        .procname = "printk_ratelimit",
770        .data = &printk_ratelimit_state.interval,
771        .maxlen = sizeof(int),
772        .mode = 0644,
773        .proc_handler = proc_dointvec_jiffies,
774    },
775    {
776        .procname = "printk_ratelimit_burst",
777        .data = &printk_ratelimit_state.burst,
778        .maxlen = sizeof(int),
779        .mode = 0644,
780        .proc_handler = proc_dointvec,
781    },
782    {
783        .procname = "printk_delay",
784        .data = &printk_delay_msec,
785        .maxlen = sizeof(int),
786        .mode = 0644,
787        .proc_handler = proc_dointvec_minmax,
788        .extra1 = &zero,
789        .extra2 = &ten_thousand,
790    },
791    {
792        .procname = "dmesg_restrict",
793        .data = &dmesg_restrict,
794        .maxlen = sizeof(int),
795        .mode = 0644,
796        .proc_handler = proc_dointvec_minmax_sysadmin,
797        .extra1 = &zero,
798        .extra2 = &one,
799    },
800    {
801        .procname = "kptr_restrict",
802        .data = &kptr_restrict,
803        .maxlen = sizeof(int),
804        .mode = 0644,
805        .proc_handler = proc_dointvec_minmax_sysadmin,
806        .extra1 = &zero,
807        .extra2 = &two,
808    },
809#endif
810    {
811        .procname = "ngroups_max",
812        .data = &ngroups_max,
813        .maxlen = sizeof (int),
814        .mode = 0444,
815        .proc_handler = proc_dointvec,
816    },
817    {
818        .procname = "cap_last_cap",
819        .data = (void *)&cap_last_cap,
820        .maxlen = sizeof(int),
821        .mode = 0444,
822        .proc_handler = proc_dointvec,
823    },
824#if defined(CONFIG_LOCKUP_DETECTOR)
825    {
826        .procname = "watchdog",
827        .data = &watchdog_user_enabled,
828        .maxlen = sizeof (int),
829        .mode = 0644,
830        .proc_handler = proc_dowatchdog,
831        .extra1 = &zero,
832        .extra2 = &one,
833    },
834    {
835        .procname = "watchdog_thresh",
836        .data = &watchdog_thresh,
837        .maxlen = sizeof(int),
838        .mode = 0644,
839        .proc_handler = proc_dowatchdog,
840        .extra1 = &zero,
841        .extra2 = &sixty,
842    },
843    {
844        .procname = "softlockup_panic",
845        .data = &softlockup_panic,
846        .maxlen = sizeof(int),
847        .mode = 0644,
848        .proc_handler = proc_dointvec_minmax,
849        .extra1 = &zero,
850        .extra2 = &one,
851    },
852    {
853        .procname = "nmi_watchdog",
854        .data = &watchdog_user_enabled,
855        .maxlen = sizeof (int),
856        .mode = 0644,
857        .proc_handler = proc_dowatchdog,
858        .extra1 = &zero,
859        .extra2 = &one,
860    },
861#endif
862#if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
863    {
864        .procname = "unknown_nmi_panic",
865        .data = &unknown_nmi_panic,
866        .maxlen = sizeof (int),
867        .mode = 0644,
868        .proc_handler = proc_dointvec,
869    },
870#endif
871#if defined(CONFIG_X86)
872    {
873        .procname = "panic_on_unrecovered_nmi",
874        .data = &panic_on_unrecovered_nmi,
875        .maxlen = sizeof(int),
876        .mode = 0644,
877        .proc_handler = proc_dointvec,
878    },
879    {
880        .procname = "panic_on_io_nmi",
881        .data = &panic_on_io_nmi,
882        .maxlen = sizeof(int),
883        .mode = 0644,
884        .proc_handler = proc_dointvec,
885    },
886#ifdef CONFIG_DEBUG_STACKOVERFLOW
887    {
888        .procname = "panic_on_stackoverflow",
889        .data = &sysctl_panic_on_stackoverflow,
890        .maxlen = sizeof(int),
891        .mode = 0644,
892        .proc_handler = proc_dointvec,
893    },
894#endif
895    {
896        .procname = "bootloader_type",
897        .data = &bootloader_type,
898        .maxlen = sizeof (int),
899        .mode = 0444,
900        .proc_handler = proc_dointvec,
901    },
902    {
903        .procname = "bootloader_version",
904        .data = &bootloader_version,
905        .maxlen = sizeof (int),
906        .mode = 0444,
907        .proc_handler = proc_dointvec,
908    },
909    {
910        .procname = "kstack_depth_to_print",
911        .data = &kstack_depth_to_print,
912        .maxlen = sizeof(int),
913        .mode = 0644,
914        .proc_handler = proc_dointvec,
915    },
916    {
917        .procname = "io_delay_type",
918        .data = &io_delay_type,
919        .maxlen = sizeof(int),
920        .mode = 0644,
921        .proc_handler = proc_dointvec,
922    },
923#endif
924#if defined(CONFIG_MMU)
925    {
926        .procname = "randomize_va_space",
927        .data = &randomize_va_space,
928        .maxlen = sizeof(int),
929        .mode = 0644,
930        .proc_handler = proc_dointvec,
931    },
932#endif
933#if defined(CONFIG_S390) && defined(CONFIG_SMP)
934    {
935        .procname = "spin_retry",
936        .data = &spin_retry,
937        .maxlen = sizeof (int),
938        .mode = 0644,
939        .proc_handler = proc_dointvec,
940    },
941#endif
942#if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
943    {
944        .procname = "acpi_video_flags",
945        .data = &acpi_realmode_flags,
946        .maxlen = sizeof (unsigned long),
947        .mode = 0644,
948        .proc_handler = proc_doulongvec_minmax,
949    },
950#endif
951#ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
952    {
953        .procname = "ignore-unaligned-usertrap",
954        .data = &no_unaligned_warning,
955        .maxlen = sizeof (int),
956         .mode = 0644,
957        .proc_handler = proc_dointvec,
958    },
959#endif
960#ifdef CONFIG_IA64
961    {
962        .procname = "unaligned-dump-stack",
963        .data = &unaligned_dump_stack,
964        .maxlen = sizeof (int),
965        .mode = 0644,
966        .proc_handler = proc_dointvec,
967    },
968#endif
969#ifdef CONFIG_DETECT_HUNG_TASK
970    {
971        .procname = "hung_task_panic",
972        .data = &sysctl_hung_task_panic,
973        .maxlen = sizeof(int),
974        .mode = 0644,
975        .proc_handler = proc_dointvec_minmax,
976        .extra1 = &zero,
977        .extra2 = &one,
978    },
979    {
980        .procname = "hung_task_check_count",
981        .data = &sysctl_hung_task_check_count,
982        .maxlen = sizeof(int),
983        .mode = 0644,
984        .proc_handler = proc_dointvec_minmax,
985        .extra1 = &zero,
986    },
987    {
988        .procname = "hung_task_timeout_secs",
989        .data = &sysctl_hung_task_timeout_secs,
990        .maxlen = sizeof(unsigned long),
991        .mode = 0644,
992        .proc_handler = proc_dohung_task_timeout_secs,
993        .extra2 = &hung_task_timeout_max,
994    },
995    {
996        .procname = "hung_task_warnings",
997        .data = &sysctl_hung_task_warnings,
998        .maxlen = sizeof(int),
999        .mode = 0644,
1000        .proc_handler = proc_dointvec_minmax,
1001        .extra1 = &neg_one,
1002    },
1003#endif
1004#ifdef CONFIG_COMPAT
1005    {
1006        .procname = "compat-log",
1007        .data = &compat_log,
1008        .maxlen = sizeof (int),
1009         .mode = 0644,
1010        .proc_handler = proc_dointvec,
1011    },
1012#endif
1013#ifdef CONFIG_RT_MUTEXES
1014    {
1015        .procname = "max_lock_depth",
1016        .data = &max_lock_depth,
1017        .maxlen = sizeof(int),
1018        .mode = 0644,
1019        .proc_handler = proc_dointvec,
1020    },
1021#endif
1022    {
1023        .procname = "poweroff_cmd",
1024        .data = &poweroff_cmd,
1025        .maxlen = POWEROFF_CMD_PATH_LEN,
1026        .mode = 0644,
1027        .proc_handler = proc_dostring,
1028    },
1029#ifdef CONFIG_KEYS
1030    {
1031        .procname = "keys",
1032        .mode = 0555,
1033        .child = key_sysctls,
1034    },
1035#endif
1036#ifdef CONFIG_RCU_TORTURE_TEST
1037    {
1038        .procname = "rcutorture_runnable",
1039        .data = &rcutorture_runnable,
1040        .maxlen = sizeof(int),
1041        .mode = 0644,
1042        .proc_handler = proc_dointvec,
1043    },
1044#endif
1045#ifdef CONFIG_PERF_EVENTS
1046    /*
1047     * User-space scripts rely on the existence of this file
1048     * as a feature check for perf_events being enabled.
1049     *
1050     * So it's an ABI, do not remove!
1051     */
1052    {
1053        .procname = "perf_event_paranoid",
1054        .data = &sysctl_perf_event_paranoid,
1055        .maxlen = sizeof(sysctl_perf_event_paranoid),
1056        .mode = 0644,
1057        .proc_handler = proc_dointvec,
1058    },
1059    {
1060        .procname = "perf_event_mlock_kb",
1061        .data = &sysctl_perf_event_mlock,
1062        .maxlen = sizeof(sysctl_perf_event_mlock),
1063        .mode = 0644,
1064        .proc_handler = proc_dointvec,
1065    },
1066    {
1067        .procname = "perf_event_max_sample_rate",
1068        .data = &sysctl_perf_event_sample_rate,
1069        .maxlen = sizeof(sysctl_perf_event_sample_rate),
1070        .mode = 0644,
1071        .proc_handler = perf_proc_update_handler,
1072        .extra1 = &one,
1073    },
1074    {
1075        .procname = "perf_cpu_time_max_percent",
1076        .data = &sysctl_perf_cpu_time_max_percent,
1077        .maxlen = sizeof(sysctl_perf_cpu_time_max_percent),
1078        .mode = 0644,
1079        .proc_handler = perf_cpu_time_max_percent_handler,
1080        .extra1 = &zero,
1081        .extra2 = &one_hundred,
1082    },
1083#endif
1084#ifdef CONFIG_KMEMCHECK
1085    {
1086        .procname = "kmemcheck",
1087        .data = &kmemcheck_enabled,
1088        .maxlen = sizeof(int),
1089        .mode = 0644,
1090        .proc_handler = proc_dointvec,
1091    },
1092#endif
1093    { }
1094};
1095
1096static struct ctl_table vm_table[] = {
1097    {
1098        .procname = "overcommit_memory",
1099        .data = &sysctl_overcommit_memory,
1100        .maxlen = sizeof(sysctl_overcommit_memory),
1101        .mode = 0644,
1102        .proc_handler = proc_dointvec_minmax,
1103        .extra1 = &zero,
1104        .extra2 = &two,
1105    },
1106    {
1107        .procname = "panic_on_oom",
1108        .data = &sysctl_panic_on_oom,
1109        .maxlen = sizeof(sysctl_panic_on_oom),
1110        .mode = 0644,
1111        .proc_handler = proc_dointvec_minmax,
1112        .extra1 = &zero,
1113        .extra2 = &two,
1114    },
1115    {
1116        .procname = "oom_kill_allocating_task",
1117        .data = &sysctl_oom_kill_allocating_task,
1118        .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1119        .mode = 0644,
1120        .proc_handler = proc_dointvec,
1121    },
1122    {
1123        .procname = "oom_dump_tasks",
1124        .data = &sysctl_oom_dump_tasks,
1125        .maxlen = sizeof(sysctl_oom_dump_tasks),
1126        .mode = 0644,
1127        .proc_handler = proc_dointvec,
1128    },
1129    {
1130        .procname = "overcommit_ratio",
1131        .data = &sysctl_overcommit_ratio,
1132        .maxlen = sizeof(sysctl_overcommit_ratio),
1133        .mode = 0644,
1134        .proc_handler = overcommit_ratio_handler,
1135    },
1136    {
1137        .procname = "overcommit_kbytes",
1138        .data = &sysctl_overcommit_kbytes,
1139        .maxlen = sizeof(sysctl_overcommit_kbytes),
1140        .mode = 0644,
1141        .proc_handler = overcommit_kbytes_handler,
1142    },
1143    {
1144        .procname = "page-cluster",
1145        .data = &page_cluster,
1146        .maxlen = sizeof(int),
1147        .mode = 0644,
1148        .proc_handler = proc_dointvec_minmax,
1149        .extra1 = &zero,
1150    },
1151    {
1152        .procname = "dirty_background_ratio",
1153        .data = &dirty_background_ratio,
1154        .maxlen = sizeof(dirty_background_ratio),
1155        .mode = 0644,
1156        .proc_handler = dirty_background_ratio_handler,
1157        .extra1 = &zero,
1158        .extra2 = &one_hundred,
1159    },
1160    {
1161        .procname = "dirty_background_bytes",
1162        .data = &dirty_background_bytes,
1163        .maxlen = sizeof(dirty_background_bytes),
1164        .mode = 0644,
1165        .proc_handler = dirty_background_bytes_handler,
1166        .extra1 = &one_ul,
1167    },
1168    {
1169        .procname = "dirty_ratio",
1170        .data = &vm_dirty_ratio,
1171        .maxlen = sizeof(vm_dirty_ratio),
1172        .mode = 0644,
1173        .proc_handler = dirty_ratio_handler,
1174        .extra1 = &zero,
1175        .extra2 = &one_hundred,
1176    },
1177    {
1178        .procname = "dirty_bytes",
1179        .data = &vm_dirty_bytes,
1180        .maxlen = sizeof(vm_dirty_bytes),
1181        .mode = 0644,
1182        .proc_handler = dirty_bytes_handler,
1183        .extra1 = &dirty_bytes_min,
1184    },
1185    {
1186        .procname = "dirty_writeback_centisecs",
1187        .data = &dirty_writeback_interval,
1188        .maxlen = sizeof(dirty_writeback_interval),
1189        .mode = 0644,
1190        .proc_handler = dirty_writeback_centisecs_handler,
1191    },
1192    {
1193        .procname = "dirty_expire_centisecs",
1194        .data = &dirty_expire_interval,
1195        .maxlen = sizeof(dirty_expire_interval),
1196        .mode = 0644,
1197        .proc_handler = proc_dointvec_minmax,
1198        .extra1 = &zero,
1199    },
1200    {
1201        .procname = "nr_pdflush_threads",
1202        .mode = 0444 /* read-only */,
1203        .proc_handler = pdflush_proc_obsolete,
1204    },
1205    {
1206        .procname = "swappiness",
1207        .data = &vm_swappiness,
1208        .maxlen = sizeof(vm_swappiness),
1209        .mode = 0644,
1210        .proc_handler = proc_dointvec_minmax,
1211        .extra1 = &zero,
1212        .extra2 = &one_hundred,
1213    },
1214#ifdef CONFIG_HUGETLB_PAGE
1215    {
1216        .procname = "nr_hugepages",
1217        .data = NULL,
1218        .maxlen = sizeof(unsigned long),
1219        .mode = 0644,
1220        .proc_handler = hugetlb_sysctl_handler,
1221        .extra1 = (void *)&hugetlb_zero,
1222        .extra2 = (void *)&hugetlb_infinity,
1223    },
1224#ifdef CONFIG_NUMA
1225    {
1226        .procname = "nr_hugepages_mempolicy",
1227        .data = NULL,
1228        .maxlen = sizeof(unsigned long),
1229        .mode = 0644,
1230        .proc_handler = &hugetlb_mempolicy_sysctl_handler,
1231        .extra1 = (void *)&hugetlb_zero,
1232        .extra2 = (void *)&hugetlb_infinity,
1233    },
1234#endif
1235     {
1236        .procname = "hugetlb_shm_group",
1237        .data = &sysctl_hugetlb_shm_group,
1238        .maxlen = sizeof(gid_t),
1239        .mode = 0644,
1240        .proc_handler = proc_dointvec,
1241     },
1242     {
1243        .procname = "hugepages_treat_as_movable",
1244        .data = &hugepages_treat_as_movable,
1245        .maxlen = sizeof(int),
1246        .mode = 0644,
1247        .proc_handler = proc_dointvec,
1248    },
1249    {
1250        .procname = "nr_overcommit_hugepages",
1251        .data = NULL,
1252        .maxlen = sizeof(unsigned long),
1253        .mode = 0644,
1254        .proc_handler = hugetlb_overcommit_handler,
1255        .extra1 = (void *)&hugetlb_zero,
1256        .extra2 = (void *)&hugetlb_infinity,
1257    },
1258#endif
1259    {
1260        .procname = "lowmem_reserve_ratio",
1261        .data = &sysctl_lowmem_reserve_ratio,
1262        .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1263        .mode = 0644,
1264        .proc_handler = lowmem_reserve_ratio_sysctl_handler,
1265    },
1266    {
1267        .procname = "drop_caches",
1268        .data = &sysctl_drop_caches,
1269        .maxlen = sizeof(int),
1270        .mode = 0644,
1271        .proc_handler = drop_caches_sysctl_handler,
1272        .extra1 = &one,
1273        .extra2 = &four,
1274    },
1275#ifdef CONFIG_COMPACTION
1276    {
1277        .procname = "compact_memory",
1278        .data = &sysctl_compact_memory,
1279        .maxlen = sizeof(int),
1280        .mode = 0200,
1281        .proc_handler = sysctl_compaction_handler,
1282    },
1283    {
1284        .procname = "extfrag_threshold",
1285        .data = &sysctl_extfrag_threshold,
1286        .maxlen = sizeof(int),
1287        .mode = 0644,
1288        .proc_handler = sysctl_extfrag_handler,
1289        .extra1 = &min_extfrag_threshold,
1290        .extra2 = &max_extfrag_threshold,
1291    },
1292
1293#endif /* CONFIG_COMPACTION */
1294    {
1295        .procname = "min_free_kbytes",
1296        .data = &min_free_kbytes,
1297        .maxlen = sizeof(min_free_kbytes),
1298        .mode = 0644,
1299        .proc_handler = min_free_kbytes_sysctl_handler,
1300        .extra1 = &zero,
1301    },
1302    {
1303        .procname = "percpu_pagelist_fraction",
1304        .data = &percpu_pagelist_fraction,
1305        .maxlen = sizeof(percpu_pagelist_fraction),
1306        .mode = 0644,
1307        .proc_handler = percpu_pagelist_fraction_sysctl_handler,
1308        .extra1 = &min_percpu_pagelist_fract,
1309    },
1310#ifdef CONFIG_MMU
1311    {
1312        .procname = "max_map_count",
1313        .data = &sysctl_max_map_count,
1314        .maxlen = sizeof(sysctl_max_map_count),
1315        .mode = 0644,
1316        .proc_handler = proc_dointvec_minmax,
1317        .extra1 = &zero,
1318    },
1319#else
1320    {
1321        .procname = "nr_trim_pages",
1322        .data = &sysctl_nr_trim_pages,
1323        .maxlen = sizeof(sysctl_nr_trim_pages),
1324        .mode = 0644,
1325        .proc_handler = proc_dointvec_minmax,
1326        .extra1 = &zero,
1327    },
1328#endif
1329    {
1330        .procname = "laptop_mode",
1331        .data = &laptop_mode,
1332        .maxlen = sizeof(laptop_mode),
1333        .mode = 0644,
1334        .proc_handler = proc_dointvec_jiffies,
1335    },
1336    {
1337        .procname = "block_dump",
1338        .data = &block_dump,
1339        .maxlen = sizeof(block_dump),
1340        .mode = 0644,
1341        .proc_handler = proc_dointvec,
1342        .extra1 = &zero,
1343    },
1344    {
1345        .procname = "vfs_cache_pressure",
1346        .data = &sysctl_vfs_cache_pressure,
1347        .maxlen = sizeof(sysctl_vfs_cache_pressure),
1348        .mode = 0644,
1349        .proc_handler = proc_dointvec,
1350        .extra1 = &zero,
1351    },
1352#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1353    {
1354        .procname = "legacy_va_layout",
1355        .data = &sysctl_legacy_va_layout,
1356        .maxlen = sizeof(sysctl_legacy_va_layout),
1357        .mode = 0644,
1358        .proc_handler = proc_dointvec,
1359        .extra1 = &zero,
1360    },
1361#endif
1362#ifdef CONFIG_NUMA
1363    {
1364        .procname = "zone_reclaim_mode",
1365        .data = &zone_reclaim_mode,
1366        .maxlen = sizeof(zone_reclaim_mode),
1367        .mode = 0644,
1368        .proc_handler = proc_dointvec,
1369        .extra1 = &zero,
1370    },
1371    {
1372        .procname = "min_unmapped_ratio",
1373        .data = &sysctl_min_unmapped_ratio,
1374        .maxlen = sizeof(sysctl_min_unmapped_ratio),
1375        .mode = 0644,
1376        .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
1377        .extra1 = &zero,
1378        .extra2 = &one_hundred,
1379    },
1380    {
1381        .procname = "min_slab_ratio",
1382        .data = &sysctl_min_slab_ratio,
1383        .maxlen = sizeof(sysctl_min_slab_ratio),
1384        .mode = 0644,
1385        .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
1386        .extra1 = &zero,
1387        .extra2 = &one_hundred,
1388    },
1389#endif
1390#ifdef CONFIG_SMP
1391    {
1392        .procname = "stat_interval",
1393        .data = &sysctl_stat_interval,
1394        .maxlen = sizeof(sysctl_stat_interval),
1395        .mode = 0644,
1396        .proc_handler = proc_dointvec_jiffies,
1397    },
1398#endif
1399#ifdef CONFIG_MMU
1400    {
1401        .procname = "mmap_min_addr",
1402        .data = &dac_mmap_min_addr,
1403        .maxlen = sizeof(unsigned long),
1404        .mode = 0644,
1405        .proc_handler = mmap_min_addr_handler,
1406    },
1407#endif
1408#ifdef CONFIG_NUMA
1409    {
1410        .procname = "numa_zonelist_order",
1411        .data = &numa_zonelist_order,
1412        .maxlen = NUMA_ZONELIST_ORDER_LEN,
1413        .mode = 0644,
1414        .proc_handler = numa_zonelist_order_handler,
1415    },
1416#endif
1417#if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1418   (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1419    {
1420        .procname = "vdso_enabled",
1421        .data = &vdso_enabled,
1422        .maxlen = sizeof(vdso_enabled),
1423        .mode = 0644,
1424        .proc_handler = proc_dointvec,
1425        .extra1 = &zero,
1426    },
1427#endif
1428#ifdef CONFIG_HIGHMEM
1429    {
1430        .procname = "highmem_is_dirtyable",
1431        .data = &vm_highmem_is_dirtyable,
1432        .maxlen = sizeof(vm_highmem_is_dirtyable),
1433        .mode = 0644,
1434        .proc_handler = proc_dointvec_minmax,
1435        .extra1 = &zero,
1436        .extra2 = &one,
1437    },
1438#endif
1439    {
1440        .procname = "scan_unevictable_pages",
1441        .data = &scan_unevictable_pages,
1442        .maxlen = sizeof(scan_unevictable_pages),
1443        .mode = 0644,
1444        .proc_handler = scan_unevictable_handler,
1445    },
1446#ifdef CONFIG_MEMORY_FAILURE
1447    {
1448        .procname = "memory_failure_early_kill",
1449        .data = &sysctl_memory_failure_early_kill,
1450        .maxlen = sizeof(sysctl_memory_failure_early_kill),
1451        .mode = 0644,
1452        .proc_handler = proc_dointvec_minmax,
1453        .extra1 = &zero,
1454        .extra2 = &one,
1455    },
1456    {
1457        .procname = "memory_failure_recovery",
1458        .data = &sysctl_memory_failure_recovery,
1459        .maxlen = sizeof(sysctl_memory_failure_recovery),
1460        .mode = 0644,
1461        .proc_handler = proc_dointvec_minmax,
1462        .extra1 = &zero,
1463        .extra2 = &one,
1464    },
1465#endif
1466    {
1467        .procname = "user_reserve_kbytes",
1468        .data = &sysctl_user_reserve_kbytes,
1469        .maxlen = sizeof(sysctl_user_reserve_kbytes),
1470        .mode = 0644,
1471        .proc_handler = proc_doulongvec_minmax,
1472    },
1473    {
1474        .procname = "admin_reserve_kbytes",
1475        .data = &sysctl_admin_reserve_kbytes,
1476        .maxlen = sizeof(sysctl_admin_reserve_kbytes),
1477        .mode = 0644,
1478        .proc_handler = proc_doulongvec_minmax,
1479    },
1480    { }
1481};
1482
1483#if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1484static struct ctl_table binfmt_misc_table[] = {
1485    { }
1486};
1487#endif
1488
1489static struct ctl_table fs_table[] = {
1490    {
1491        .procname = "inode-nr",
1492        .data = &inodes_stat,
1493        .maxlen = 2*sizeof(long),
1494        .mode = 0444,
1495        .proc_handler = proc_nr_inodes,
1496    },
1497    {
1498        .procname = "inode-state",
1499        .data = &inodes_stat,
1500        .maxlen = 7*sizeof(long),
1501        .mode = 0444,
1502        .proc_handler = proc_nr_inodes,
1503    },
1504    {
1505        .procname = "file-nr",
1506        .data = &files_stat,
1507        .maxlen = sizeof(files_stat),
1508        .mode = 0444,
1509        .proc_handler = proc_nr_files,
1510    },
1511    {
1512        .procname = "file-max",
1513        .data = &files_stat.max_files,
1514        .maxlen = sizeof(files_stat.max_files),
1515        .mode = 0644,
1516        .proc_handler = proc_doulongvec_minmax,
1517    },
1518    {
1519        .procname = "nr_open",
1520        .data = &sysctl_nr_open,
1521        .maxlen = sizeof(int),
1522        .mode = 0644,
1523        .proc_handler = proc_dointvec_minmax,
1524        .extra1 = &sysctl_nr_open_min,
1525        .extra2 = &sysctl_nr_open_max,
1526    },
1527    {
1528        .procname = "dentry-state",
1529        .data = &dentry_stat,
1530        .maxlen = 6*sizeof(long),
1531        .mode = 0444,
1532        .proc_handler = proc_nr_dentry,
1533    },
1534    {
1535        .procname = "overflowuid",
1536        .data = &fs_overflowuid,
1537        .maxlen = sizeof(int),
1538        .mode = 0644,
1539        .proc_handler = proc_dointvec_minmax,
1540        .extra1 = &minolduid,
1541        .extra2 = &maxolduid,
1542    },
1543    {
1544        .procname = "overflowgid",
1545        .data = &fs_overflowgid,
1546        .maxlen = sizeof(int),
1547        .mode = 0644,
1548        .proc_handler = proc_dointvec_minmax,
1549        .extra1 = &minolduid,
1550        .extra2 = &maxolduid,
1551    },
1552#ifdef CONFIG_FILE_LOCKING
1553    {
1554        .procname = "leases-enable",
1555        .data = &leases_enable,
1556        .maxlen = sizeof(int),
1557        .mode = 0644,
1558        .proc_handler = proc_dointvec,
1559    },
1560#endif
1561#ifdef CONFIG_DNOTIFY
1562    {
1563        .procname = "dir-notify-enable",
1564        .data = &dir_notify_enable,
1565        .maxlen = sizeof(int),
1566        .mode = 0644,
1567        .proc_handler = proc_dointvec,
1568    },
1569#endif
1570#ifdef CONFIG_MMU
1571#ifdef CONFIG_FILE_LOCKING
1572    {
1573        .procname = "lease-break-time",
1574        .data = &lease_break_time,
1575        .maxlen = sizeof(int),
1576        .mode = 0644,
1577        .proc_handler = proc_dointvec,
1578    },
1579#endif
1580#ifdef CONFIG_AIO
1581    {
1582        .procname = "aio-nr",
1583        .data = &aio_nr,
1584        .maxlen = sizeof(aio_nr),
1585        .mode = 0444,
1586        .proc_handler = proc_doulongvec_minmax,
1587    },
1588    {
1589        .procname = "aio-max-nr",
1590        .data = &aio_max_nr,
1591        .maxlen = sizeof(aio_max_nr),
1592        .mode = 0644,
1593        .proc_handler = proc_doulongvec_minmax,
1594    },
1595#endif /* CONFIG_AIO */
1596#ifdef CONFIG_INOTIFY_USER
1597    {
1598        .procname = "inotify",
1599        .mode = 0555,
1600        .child = inotify_table,
1601    },
1602#endif
1603#ifdef CONFIG_EPOLL
1604    {
1605        .procname = "epoll",
1606        .mode = 0555,
1607        .child = epoll_table,
1608    },
1609#endif
1610#endif
1611    {
1612        .procname = "protected_symlinks",
1613        .data = &sysctl_protected_symlinks,
1614        .maxlen = sizeof(int),
1615        .mode = 0600,
1616        .proc_handler = proc_dointvec_minmax,
1617        .extra1 = &zero,
1618        .extra2 = &one,
1619    },
1620    {
1621        .procname = "protected_hardlinks",
1622        .data = &sysctl_protected_hardlinks,
1623        .maxlen = sizeof(int),
1624        .mode = 0600,
1625        .proc_handler = proc_dointvec_minmax,
1626        .extra1 = &zero,
1627        .extra2 = &one,
1628    },
1629    {
1630        .procname = "suid_dumpable",
1631        .data = &suid_dumpable,
1632        .maxlen = sizeof(int),
1633        .mode = 0644,
1634        .proc_handler = proc_dointvec_minmax_coredump,
1635        .extra1 = &zero,
1636        .extra2 = &two,
1637    },
1638#if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1639    {
1640        .procname = "binfmt_misc",
1641        .mode = 0555,
1642        .child = binfmt_misc_table,
1643    },
1644#endif
1645    {
1646        .procname = "pipe-max-size",
1647        .data = &pipe_max_size,
1648        .maxlen = sizeof(int),
1649        .mode = 0644,
1650        .proc_handler = &pipe_proc_fn,
1651        .extra1 = &pipe_min_size,
1652    },
1653    { }
1654};
1655
1656static struct ctl_table debug_table[] = {
1657#ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1658    {
1659        .procname = "exception-trace",
1660        .data = &show_unhandled_signals,
1661        .maxlen = sizeof(int),
1662        .mode = 0644,
1663        .proc_handler = proc_dointvec
1664    },
1665#endif
1666#if defined(CONFIG_OPTPROBES)
1667    {
1668        .procname = "kprobes-optimization",
1669        .data = &sysctl_kprobes_optimization,
1670        .maxlen = sizeof(int),
1671        .mode = 0644,
1672        .proc_handler = proc_kprobes_optimization_handler,
1673        .extra1 = &zero,
1674        .extra2 = &one,
1675    },
1676#endif
1677    { }
1678};
1679
1680static struct ctl_table dev_table[] = {
1681    { }
1682};
1683
1684int __init sysctl_init(void)
1685{
1686    struct ctl_table_header *hdr;
1687
1688    hdr = register_sysctl_table(sysctl_base_table);
1689    kmemleak_not_leak(hdr);
1690    return 0;
1691}
1692
1693#endif /* CONFIG_SYSCTL */
1694
1695/*
1696 * /proc/sys support
1697 */
1698
1699#ifdef CONFIG_PROC_SYSCTL
1700
1701static int _proc_do_string(void* data, int maxlen, int write,
1702               void __user *buffer,
1703               size_t *lenp, loff_t *ppos)
1704{
1705    size_t len;
1706    char __user *p;
1707    char c;
1708
1709    if (!data || !maxlen || !*lenp) {
1710        *lenp = 0;
1711        return 0;
1712    }
1713
1714    if (write) {
1715        len = 0;
1716        p = buffer;
1717        while (len < *lenp) {
1718            if (get_user(c, p++))
1719                return -EFAULT;
1720            if (c == 0 || c == '\n')
1721                break;
1722            len++;
1723        }
1724        if (len >= maxlen)
1725            len = maxlen-1;
1726        if(copy_from_user(data, buffer, len))
1727            return -EFAULT;
1728        ((char *) data)[len] = 0;
1729        *ppos += *lenp;
1730    } else {
1731        len = strlen(data);
1732        if (len > maxlen)
1733            len = maxlen;
1734
1735        if (*ppos > len) {
1736            *lenp = 0;
1737            return 0;
1738        }
1739
1740        data += *ppos;
1741        len -= *ppos;
1742
1743        if (len > *lenp)
1744            len = *lenp;
1745        if (len)
1746            if(copy_to_user(buffer, data, len))
1747                return -EFAULT;
1748        if (len < *lenp) {
1749            if(put_user('\n', ((char __user *) buffer) + len))
1750                return -EFAULT;
1751            len++;
1752        }
1753        *lenp = len;
1754        *ppos += len;
1755    }
1756    return 0;
1757}
1758
1759/**
1760 * proc_dostring - read a string sysctl
1761 * @table: the sysctl table
1762 * @write: %TRUE if this is a write to the sysctl file
1763 * @buffer: the user buffer
1764 * @lenp: the size of the user buffer
1765 * @ppos: file position
1766 *
1767 * Reads/writes a string from/to the user buffer. If the kernel
1768 * buffer provided is not large enough to hold the string, the
1769 * string is truncated. The copied string is %NULL-terminated.
1770 * If the string is being read by the user process, it is copied
1771 * and a newline '\n' is added. It is truncated if the buffer is
1772 * not large enough.
1773 *
1774 * Returns 0 on success.
1775 */
1776int proc_dostring(struct ctl_table *table, int write,
1777          void __user *buffer, size_t *lenp, loff_t *ppos)
1778{
1779    return _proc_do_string(table->data, table->maxlen, write,
1780                   buffer, lenp, ppos);
1781}
1782
1783static size_t proc_skip_spaces(char **buf)
1784{
1785    size_t ret;
1786    char *tmp = skip_spaces(*buf);
1787    ret = tmp - *buf;
1788    *buf = tmp;
1789    return ret;
1790}
1791
1792static void proc_skip_char(char **buf, size_t *size, const char v)
1793{
1794    while (*size) {
1795        if (**buf != v)
1796            break;
1797        (*size)--;
1798        (*buf)++;
1799    }
1800}
1801
1802#define TMPBUFLEN 22
1803/**
1804 * proc_get_long - reads an ASCII formatted integer from a user buffer
1805 *
1806 * @buf: a kernel buffer
1807 * @size: size of the kernel buffer
1808 * @val: this is where the number will be stored
1809 * @neg: set to %TRUE if number is negative
1810 * @perm_tr: a vector which contains the allowed trailers
1811 * @perm_tr_len: size of the perm_tr vector
1812 * @tr: pointer to store the trailer character
1813 *
1814 * In case of success %0 is returned and @buf and @size are updated with
1815 * the amount of bytes read. If @tr is non-NULL and a trailing
1816 * character exists (size is non-zero after returning from this
1817 * function), @tr is updated with the trailing character.
1818 */
1819static int proc_get_long(char **buf, size_t *size,
1820              unsigned long *val, bool *neg,
1821              const char *perm_tr, unsigned perm_tr_len, char *tr)
1822{
1823    int len;
1824    char *p, tmp[TMPBUFLEN];
1825
1826    if (!*size)
1827        return -EINVAL;
1828
1829    len = *size;
1830    if (len > TMPBUFLEN - 1)
1831        len = TMPBUFLEN - 1;
1832
1833    memcpy(tmp, *buf, len);
1834
1835    tmp[len] = 0;
1836    p = tmp;
1837    if (*p == '-' && *size > 1) {
1838        *neg = true;
1839        p++;
1840    } else
1841        *neg = false;
1842    if (!isdigit(*p))
1843        return -EINVAL;
1844
1845    *val = simple_strtoul(p, &p, 0);
1846
1847    len = p - tmp;
1848
1849    /* We don't know if the next char is whitespace thus we may accept
1850     * invalid integers (e.g. 1234...a) or two integers instead of one
1851     * (e.g. 123...1). So lets not allow such large numbers. */
1852    if (len == TMPBUFLEN - 1)
1853        return -EINVAL;
1854
1855    if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
1856        return -EINVAL;
1857
1858    if (tr && (len < *size))
1859        *tr = *p;
1860
1861    *buf += len;
1862    *size -= len;
1863
1864    return 0;
1865}
1866
1867/**
1868 * proc_put_long - converts an integer to a decimal ASCII formatted string
1869 *
1870 * @buf: the user buffer
1871 * @size: the size of the user buffer
1872 * @val: the integer to be converted
1873 * @neg: sign of the number, %TRUE for negative
1874 *
1875 * In case of success %0 is returned and @buf and @size are updated with
1876 * the amount of bytes written.
1877 */
1878static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
1879              bool neg)
1880{
1881    int len;
1882    char tmp[TMPBUFLEN], *p = tmp;
1883
1884    sprintf(p, "%s%lu", neg ? "-" : "", val);
1885    len = strlen(tmp);
1886    if (len > *size)
1887        len = *size;
1888    if (copy_to_user(*buf, tmp, len))
1889        return -EFAULT;
1890    *size -= len;
1891    *buf += len;
1892    return 0;
1893}
1894#undef TMPBUFLEN
1895
1896static int proc_put_char(void __user **buf, size_t *size, char c)
1897{
1898    if (*size) {
1899        char __user **buffer = (char __user **)buf;
1900        if (put_user(c, *buffer))
1901            return -EFAULT;
1902        (*size)--, (*buffer)++;
1903        *buf = *buffer;
1904    }
1905    return 0;
1906}
1907
1908static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
1909                 int *valp,
1910                 int write, void *data)
1911{
1912    if (write) {
1913        *valp = *negp ? -*lvalp : *lvalp;
1914    } else {
1915        int val = *valp;
1916        if (val < 0) {
1917            *negp = true;
1918            *lvalp = (unsigned long)-val;
1919        } else {
1920            *negp = false;
1921            *lvalp = (unsigned long)val;
1922        }
1923    }
1924    return 0;
1925}
1926
1927static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
1928
1929static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
1930          int write, void __user *buffer,
1931          size_t *lenp, loff_t *ppos,
1932          int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
1933                  int write, void *data),
1934          void *data)
1935{
1936    int *i, vleft, first = 1, err = 0;
1937    unsigned long page = 0;
1938    size_t left;
1939    char *kbuf;
1940    
1941    if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
1942        *lenp = 0;
1943        return 0;
1944    }
1945    
1946    i = (int *) tbl_data;
1947    vleft = table->maxlen / sizeof(*i);
1948    left = *lenp;
1949
1950    if (!conv)
1951        conv = do_proc_dointvec_conv;
1952
1953    if (write) {
1954        if (left > PAGE_SIZE - 1)
1955            left = PAGE_SIZE - 1;
1956        page = __get_free_page(GFP_TEMPORARY);
1957        kbuf = (char *) page;
1958        if (!kbuf)
1959            return -ENOMEM;
1960        if (copy_from_user(kbuf, buffer, left)) {
1961            err = -EFAULT;
1962            goto free;
1963        }
1964        kbuf[left] = 0;
1965    }
1966
1967    for (; left && vleft--; i++, first=0) {
1968        unsigned long lval;
1969        bool neg;
1970
1971        if (write) {
1972            left -= proc_skip_spaces(&kbuf);
1973
1974            if (!left)
1975                break;
1976            err = proc_get_long(&kbuf, &left, &lval, &neg,
1977                         proc_wspace_sep,
1978                         sizeof(proc_wspace_sep), NULL);
1979            if (err)
1980                break;
1981            if (conv(&neg, &lval, i, 1, data)) {
1982                err = -EINVAL;
1983                break;
1984            }
1985        } else {
1986            if (conv(&neg, &lval, i, 0, data)) {
1987                err = -EINVAL;
1988                break;
1989            }
1990            if (!first)
1991                err = proc_put_char(&buffer, &left, '\t');
1992            if (err)
1993                break;
1994            err = proc_put_long(&buffer, &left, lval, neg);
1995            if (err)
1996                break;
1997        }
1998    }
1999
2000    if (!write && !first && left && !err)
2001        err = proc_put_char(&buffer, &left, '\n');
2002    if (write && !err && left)
2003        left -= proc_skip_spaces(&kbuf);
2004free:
2005    if (write) {
2006        free_page(page);
2007        if (first)
2008            return err ? : -EINVAL;
2009    }
2010    *lenp -= left;
2011    *ppos += *lenp;
2012    return err;
2013}
2014
2015static int do_proc_dointvec(struct ctl_table *table, int write,
2016          void __user *buffer, size_t *lenp, loff_t *ppos,
2017          int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2018                  int write, void *data),
2019          void *data)
2020{
2021    return __do_proc_dointvec(table->data, table, write,
2022            buffer, lenp, ppos, conv, data);
2023}
2024
2025/**
2026 * proc_dointvec - read a vector of integers
2027 * @table: the sysctl table
2028 * @write: %TRUE if this is a write to the sysctl file
2029 * @buffer: the user buffer
2030 * @lenp: the size of the user buffer
2031 * @ppos: file position
2032 *
2033 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2034 * values from/to the user buffer, treated as an ASCII string.
2035 *
2036 * Returns 0 on success.
2037 */
2038int proc_dointvec(struct ctl_table *table, int write,
2039             void __user *buffer, size_t *lenp, loff_t *ppos)
2040{
2041    return do_proc_dointvec(table,write,buffer,lenp,ppos,
2042                    NULL,NULL);
2043}
2044
2045/*
2046 * Taint values can only be increased
2047 * This means we can safely use a temporary.
2048 */
2049static int proc_taint(struct ctl_table *table, int write,
2050                   void __user *buffer, size_t *lenp, loff_t *ppos)
2051{
2052    struct ctl_table t;
2053    unsigned long tmptaint = get_taint();
2054    int err;
2055
2056    if (write && !capable(CAP_SYS_ADMIN))
2057        return -EPERM;
2058
2059    t = *table;
2060    t.data = &tmptaint;
2061    err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2062    if (err < 0)
2063        return err;
2064
2065    if (write) {
2066        /*
2067         * Poor man's atomic or. Not worth adding a primitive
2068         * to everyone's atomic.h for this
2069         */
2070        int i;
2071        for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2072            if ((tmptaint >> i) & 1)
2073                add_taint(i, LOCKDEP_STILL_OK);
2074        }
2075    }
2076
2077    return err;
2078}
2079
2080#ifdef CONFIG_PRINTK
2081static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
2082                void __user *buffer, size_t *lenp, loff_t *ppos)
2083{
2084    if (write && !capable(CAP_SYS_ADMIN))
2085        return -EPERM;
2086
2087    return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2088}
2089#endif
2090
2091struct do_proc_dointvec_minmax_conv_param {
2092    int *min;
2093    int *max;
2094};
2095
2096static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2097                    int *valp,
2098                    int write, void *data)
2099{
2100    struct do_proc_dointvec_minmax_conv_param *param = data;
2101    if (write) {
2102        int val = *negp ? -*lvalp : *lvalp;
2103        if ((param->min && *param->min > val) ||
2104            (param->max && *param->max < val))
2105            return -EINVAL;
2106        *valp = val;
2107    } else {
2108        int val = *valp;
2109        if (val < 0) {
2110            *negp = true;
2111            *lvalp = (unsigned long)-val;
2112        } else {
2113            *negp = false;
2114            *lvalp = (unsigned long)val;
2115        }
2116    }
2117    return 0;
2118}
2119
2120/**
2121 * proc_dointvec_minmax - read a vector of integers with min/max values
2122 * @table: the sysctl table
2123 * @write: %TRUE if this is a write to the sysctl file
2124 * @buffer: the user buffer
2125 * @lenp: the size of the user buffer
2126 * @ppos: file position
2127 *
2128 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2129 * values from/to the user buffer, treated as an ASCII string.
2130 *
2131 * This routine will ensure the values are within the range specified by
2132 * table->extra1 (min) and table->extra2 (max).
2133 *
2134 * Returns 0 on success.
2135 */
2136int proc_dointvec_minmax(struct ctl_table *table, int write,
2137          void __user *buffer, size_t *lenp, loff_t *ppos)
2138{
2139    struct do_proc_dointvec_minmax_conv_param param = {
2140        .min = (int *) table->extra1,
2141        .max = (int *) table->extra2,
2142    };
2143    return do_proc_dointvec(table, write, buffer, lenp, ppos,
2144                do_proc_dointvec_minmax_conv, &param);
2145}
2146
2147static void validate_coredump_safety(void)
2148{
2149#ifdef CONFIG_COREDUMP
2150    if (suid_dumpable == SUID_DUMP_ROOT &&
2151        core_pattern[0] != '/' && core_pattern[0] != '|') {
2152        printk(KERN_WARNING "Unsafe core_pattern used with "\
2153            "suid_dumpable=2. Pipe handler or fully qualified "\
2154            "core dump path required.\n");
2155    }
2156#endif
2157}
2158
2159static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2160        void __user *buffer, size_t *lenp, loff_t *ppos)
2161{
2162    int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2163    if (!error)
2164        validate_coredump_safety();
2165    return error;
2166}
2167
2168#ifdef CONFIG_COREDUMP
2169static int proc_dostring_coredump(struct ctl_table *table, int write,
2170          void __user *buffer, size_t *lenp, loff_t *ppos)
2171{
2172    int error = proc_dostring(table, write, buffer, lenp, ppos);
2173    if (!error)
2174        validate_coredump_safety();
2175    return error;
2176}
2177#endif
2178
2179static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2180                     void __user *buffer,
2181                     size_t *lenp, loff_t *ppos,
2182                     unsigned long convmul,
2183                     unsigned long convdiv)
2184{
2185    unsigned long *i, *min, *max;
2186    int vleft, first = 1, err = 0;
2187    unsigned long page = 0;
2188    size_t left;
2189    char *kbuf;
2190
2191    if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2192        *lenp = 0;
2193        return 0;
2194    }
2195
2196    i = (unsigned long *) data;
2197    min = (unsigned long *) table->extra1;
2198    max = (unsigned long *) table->extra2;
2199    vleft = table->maxlen / sizeof(unsigned long);
2200    left = *lenp;
2201
2202    if (write) {
2203        if (left > PAGE_SIZE - 1)
2204            left = PAGE_SIZE - 1;
2205        page = __get_free_page(GFP_TEMPORARY);
2206        kbuf = (char *) page;
2207        if (!kbuf)
2208            return -ENOMEM;
2209        if (copy_from_user(kbuf, buffer, left)) {
2210            err = -EFAULT;
2211            goto free;
2212        }
2213        kbuf[left] = 0;
2214    }
2215
2216    for (; left && vleft--; i++, first = 0) {
2217        unsigned long val;
2218
2219        if (write) {
2220            bool neg;
2221
2222            left -= proc_skip_spaces(&kbuf);
2223
2224            err = proc_get_long(&kbuf, &left, &val, &neg,
2225                         proc_wspace_sep,
2226                         sizeof(proc_wspace_sep), NULL);
2227            if (err)
2228                break;
2229            if (neg)
2230                continue;
2231            if ((min && val < *min) || (max && val > *max))
2232                continue;
2233            *i = val;
2234        } else {
2235            val = convdiv * (*i) / convmul;
2236            if (!first) {
2237                err = proc_put_char(&buffer, &left, '\t');
2238                if (err)
2239                    break;
2240            }
2241            err = proc_put_long(&buffer, &left, val, false);
2242            if (err)
2243                break;
2244        }
2245    }
2246
2247    if (!write && !first && left && !err)
2248        err = proc_put_char(&buffer, &left, '\n');
2249    if (write && !err)
2250        left -= proc_skip_spaces(&kbuf);
2251free:
2252    if (write) {
2253        free_page(page);
2254        if (first)
2255            return err ? : -EINVAL;
2256    }
2257    *lenp -= left;
2258    *ppos += *lenp;
2259    return err;
2260}
2261
2262static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2263                     void __user *buffer,
2264                     size_t *lenp, loff_t *ppos,
2265                     unsigned long convmul,
2266                     unsigned long convdiv)
2267{
2268    return __do_proc_doulongvec_minmax(table->data, table, write,
2269            buffer, lenp, ppos, convmul, convdiv);
2270}
2271
2272/**
2273 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2274 * @table: the sysctl table
2275 * @write: %TRUE if this is a write to the sysctl file
2276 * @buffer: the user buffer
2277 * @lenp: the size of the user buffer
2278 * @ppos: file position
2279 *
2280 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2281 * values from/to the user buffer, treated as an ASCII string.
2282 *
2283 * This routine will ensure the values are within the range specified by
2284 * table->extra1 (min) and table->extra2 (max).
2285 *
2286 * Returns 0 on success.
2287 */
2288int proc_doulongvec_minmax(struct ctl_table *table, int write,
2289               void __user *buffer, size_t *lenp, loff_t *ppos)
2290{
2291    return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2292}
2293
2294/**
2295 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2296 * @table: the sysctl table
2297 * @write: %TRUE if this is a write to the sysctl file
2298 * @buffer: the user buffer
2299 * @lenp: the size of the user buffer
2300 * @ppos: file position
2301 *
2302 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2303 * values from/to the user buffer, treated as an ASCII string. The values
2304 * are treated as milliseconds, and converted to jiffies when they are stored.
2305 *
2306 * This routine will ensure the values are within the range specified by
2307 * table->extra1 (min) and table->extra2 (max).
2308 *
2309 * Returns 0 on success.
2310 */
2311int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2312                      void __user *buffer,
2313                      size_t *lenp, loff_t *ppos)
2314{
2315    return do_proc_doulongvec_minmax(table, write, buffer,
2316                     lenp, ppos, HZ, 1000l);
2317}
2318
2319
2320static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2321                     int *valp,
2322                     int write, void *data)
2323{
2324    if (write) {
2325        if (*lvalp > LONG_MAX / HZ)
2326            return 1;
2327        *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2328    } else {
2329        int val = *valp;
2330        unsigned long lval;
2331        if (val < 0) {
2332            *negp = true;
2333            lval = (unsigned long)-val;
2334        } else {
2335            *negp = false;
2336            lval = (unsigned long)val;
2337        }
2338        *lvalp = lval / HZ;
2339    }
2340    return 0;
2341}
2342
2343static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2344                        int *valp,
2345                        int write, void *data)
2346{
2347    if (write) {
2348        if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2349            return 1;
2350        *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2351    } else {
2352        int val = *valp;
2353        unsigned long lval;
2354        if (val < 0) {
2355            *negp = true;
2356            lval = (unsigned long)-val;
2357        } else {
2358            *negp = false;
2359            lval = (unsigned long)val;
2360        }
2361        *lvalp = jiffies_to_clock_t(lval);
2362    }
2363    return 0;
2364}
2365
2366static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2367                        int *valp,
2368                        int write, void *data)
2369{
2370    if (write) {
2371        unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2372
2373        if (jif > INT_MAX)
2374            return 1;
2375        *valp = (int)jif;
2376    } else {
2377        int val = *valp;
2378        unsigned long lval;
2379        if (val < 0) {
2380            *negp = true;
2381            lval = (unsigned long)-val;
2382        } else {
2383            *negp = false;
2384            lval = (unsigned long)val;
2385        }
2386        *lvalp = jiffies_to_msecs(lval);
2387    }
2388    return 0;
2389}
2390
2391/**
2392 * proc_dointvec_jiffies - read a vector of integers as seconds
2393 * @table: the sysctl table
2394 * @write: %TRUE if this is a write to the sysctl file
2395 * @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 * The values read are assumed to be in seconds, and are converted into
2402 * jiffies.
2403 *
2404 * Returns 0 on success.
2405 */
2406int proc_dointvec_jiffies(struct ctl_table *table, int write,
2407              void __user *buffer, size_t *lenp, loff_t *ppos)
2408{
2409    return do_proc_dointvec(table,write,buffer,lenp,ppos,
2410                    do_proc_dointvec_jiffies_conv,NULL);
2411}
2412
2413/**
2414 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2415 * @table: the sysctl table
2416 * @write: %TRUE if this is a write to the sysctl file
2417 * @buffer: the user buffer
2418 * @lenp: the size of the user buffer
2419 * @ppos: pointer to the file position
2420 *
2421 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2422 * values from/to the user buffer, treated as an ASCII string.
2423 * The values read are assumed to be in 1/USER_HZ seconds, and
2424 * are converted into jiffies.
2425 *
2426 * Returns 0 on success.
2427 */
2428int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2429                 void __user *buffer, size_t *lenp, loff_t *ppos)
2430{
2431    return do_proc_dointvec(table,write,buffer,lenp,ppos,
2432                    do_proc_dointvec_userhz_jiffies_conv,NULL);
2433}
2434
2435/**
2436 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2437 * @table: the sysctl table
2438 * @write: %TRUE if this is a write to the sysctl file
2439 * @buffer: the user buffer
2440 * @lenp: the size of the user buffer
2441 * @ppos: file position
2442 * @ppos: the current position in the file
2443 *
2444 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2445 * values from/to the user buffer, treated as an ASCII string.
2446 * The values read are assumed to be in 1/1000 seconds, and
2447 * are converted into jiffies.
2448 *
2449 * Returns 0 on success.
2450 */
2451int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2452                 void __user *buffer, size_t *lenp, loff_t *ppos)
2453{
2454    return do_proc_dointvec(table, write, buffer, lenp, ppos,
2455                do_proc_dointvec_ms_jiffies_conv, NULL);
2456}
2457
2458static int proc_do_cad_pid(struct ctl_table *table, int write,
2459               void __user *buffer, size_t *lenp, loff_t *ppos)
2460{
2461    struct pid *new_pid;
2462    pid_t tmp;
2463    int r;
2464
2465    tmp = pid_vnr(cad_pid);
2466
2467    r = __do_proc_dointvec(&tmp, table, write, buffer,
2468                   lenp, ppos, NULL, NULL);
2469    if (r || !write)
2470        return r;
2471
2472    new_pid = find_get_pid(tmp);
2473    if (!new_pid)
2474        return -ESRCH;
2475
2476    put_pid(xchg(&cad_pid, new_pid));
2477    return 0;
2478}
2479
2480/**
2481 * proc_do_large_bitmap - read/write from/to a large bitmap
2482 * @table: the sysctl table
2483 * @write: %TRUE if this is a write to the sysctl file
2484 * @buffer: the user buffer
2485 * @lenp: the size of the user buffer
2486 * @ppos: file position
2487 *
2488 * The bitmap is stored at table->data and the bitmap length (in bits)
2489 * in table->maxlen.
2490 *
2491 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2492 * large bitmaps may be represented in a compact manner. Writing into
2493 * the file will clear the bitmap then update it with the given input.
2494 *
2495 * Returns 0 on success.
2496 */
2497int proc_do_large_bitmap(struct ctl_table *table, int write,
2498             void __user *buffer, size_t *lenp, loff_t *ppos)
2499{
2500    int err = 0;
2501    bool first = 1;
2502    size_t left = *lenp;
2503    unsigned long bitmap_len = table->maxlen;
2504    unsigned long *bitmap = (unsigned long *) table->data;
2505    unsigned long *tmp_bitmap = NULL;
2506    char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2507
2508    if (!bitmap_len || !left || (*ppos && !write)) {
2509        *lenp = 0;
2510        return 0;
2511    }
2512
2513    if (write) {
2514        unsigned long page = 0;
2515        char *kbuf;
2516
2517        if (left > PAGE_SIZE - 1)
2518            left = PAGE_SIZE - 1;
2519
2520        page = __get_free_page(GFP_TEMPORARY);
2521        kbuf = (char *) page;
2522        if (!kbuf)
2523            return -ENOMEM;
2524        if (copy_from_user(kbuf, buffer, left)) {
2525            free_page(page);
2526            return -EFAULT;
2527                }
2528        kbuf[left] = 0;
2529
2530        tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
2531                     GFP_KERNEL);
2532        if (!tmp_bitmap) {
2533            free_page(page);
2534            return -ENOMEM;
2535        }
2536        proc_skip_char(&kbuf, &left, '\n');
2537        while (!err && left) {
2538            unsigned long val_a, val_b;
2539            bool neg;
2540
2541            err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a,
2542                         sizeof(tr_a), &c);
2543            if (err)
2544                break;
2545            if (val_a >= bitmap_len || neg) {
2546                err = -EINVAL;
2547                break;
2548            }
2549
2550            val_b = val_a;
2551            if (left) {
2552                kbuf++;
2553                left--;
2554            }
2555
2556            if (c == '-') {
2557                err = proc_get_long(&kbuf, &left, &val_b,
2558                             &neg, tr_b, sizeof(tr_b),
2559                             &c);
2560                if (err)
2561                    break;
2562                if (val_b >= bitmap_len || neg ||
2563                    val_a > val_b) {
2564                    err = -EINVAL;
2565                    break;
2566                }
2567                if (left) {
2568                    kbuf++;
2569                    left--;
2570                }
2571            }
2572
2573            bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
2574            first = 0;
2575            proc_skip_char(&kbuf, &left, '\n');
2576        }
2577        free_page(page);
2578    } else {
2579        unsigned long bit_a, bit_b = 0;
2580
2581        while (left) {
2582            bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
2583            if (bit_a >= bitmap_len)
2584                break;
2585            bit_b = find_next_zero_bit(bitmap, bitmap_len,
2586                           bit_a + 1) - 1;
2587
2588            if (!first) {
2589                err = proc_put_char(&buffer, &left, ',');
2590                if (err)
2591                    break;
2592            }
2593            err = proc_put_long(&buffer, &left, bit_a, false);
2594            if (err)
2595                break;
2596            if (bit_a != bit_b) {
2597                err = proc_put_char(&buffer, &left, '-');
2598                if (err)
2599                    break;
2600                err = proc_put_long(&buffer, &left, bit_b, false);
2601                if (err)
2602                    break;
2603            }
2604
2605            first = 0; bit_b++;
2606        }
2607        if (!err)
2608            err = proc_put_char(&buffer, &left, '\n');
2609    }
2610
2611    if (!err) {
2612        if (write) {
2613            if (*ppos)
2614                bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
2615            else
2616                bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
2617        }
2618        kfree(tmp_bitmap);
2619        *lenp -= left;
2620        *ppos += *lenp;
2621        return 0;
2622    } else {
2623        kfree(tmp_bitmap);
2624        return err;
2625    }
2626}
2627
2628#else /* CONFIG_PROC_SYSCTL */
2629
2630int proc_dostring(struct ctl_table *table, int write,
2631          void __user *buffer, size_t *lenp, loff_t *ppos)
2632{
2633    return -ENOSYS;
2634}
2635
2636int proc_dointvec(struct ctl_table *table, int write,
2637          void __user *buffer, size_t *lenp, loff_t *ppos)
2638{
2639    return -ENOSYS;
2640}
2641
2642int proc_dointvec_minmax(struct ctl_table *table, int write,
2643            void __user *buffer, size_t *lenp, loff_t *ppos)
2644{
2645    return -ENOSYS;
2646}
2647
2648int proc_dointvec_jiffies(struct ctl_table *table, int write,
2649            void __user *buffer, size_t *lenp, loff_t *ppos)
2650{
2651    return -ENOSYS;
2652}
2653
2654int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2655            void __user *buffer, size_t *lenp, loff_t *ppos)
2656{
2657    return -ENOSYS;
2658}
2659
2660int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2661                 void __user *buffer, size_t *lenp, loff_t *ppos)
2662{
2663    return -ENOSYS;
2664}
2665
2666int proc_doulongvec_minmax(struct ctl_table *table, int write,
2667            void __user *buffer, size_t *lenp, loff_t *ppos)
2668{
2669    return -ENOSYS;
2670}
2671
2672int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2673                      void __user *buffer,
2674                      size_t *lenp, loff_t *ppos)
2675{
2676    return -ENOSYS;
2677}
2678
2679
2680#endif /* CONFIG_PROC_SYSCTL */
2681
2682/*
2683 * No sense putting this after each symbol definition, twice,
2684 * exception granted :-)
2685 */
2686EXPORT_SYMBOL(proc_dointvec);
2687EXPORT_SYMBOL(proc_dointvec_jiffies);
2688EXPORT_SYMBOL(proc_dointvec_minmax);
2689EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2690EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2691EXPORT_SYMBOL(proc_dostring);
2692EXPORT_SYMBOL(proc_doulongvec_minmax);
2693EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
2694

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