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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. */
99 extern int max_threads;
100 extern int suid_dumpable;
101 #ifdef CONFIG_COREDUMP
102 extern int core_uses_pid;
103 extern char core_pattern[];
104 extern unsigned int core_pipe_limit;
105 #endif
106 extern int pid_max;
107 extern int pid_max_min, pid_max_max;
108 extern int percpu_pagelist_fraction;
109 extern int compat_log;
110 extern int latencytop_enabled;
111 extern int sysctl_nr_open_min, sysctl_nr_open_max;
112 #ifndef CONFIG_MMU
113 extern int sysctl_nr_trim_pages;
114 #endif
115
116 /* Constants used for minimum and maximum */
117 #ifdef CONFIG_LOCKUP_DETECTOR
118 static int sixty = 60;
119 #endif
120
121 static int __maybe_unused neg_one = -1;
122
123 static int zero;
124 static int __maybe_unused one = 1;
125 static int __maybe_unused two = 2;
126 static int __maybe_unused four = 4;
127 static unsigned long one_ul = 1;
128 static int one_hundred = 100;
129 #ifdef CONFIG_PRINTK
130 static int ten_thousand = 10000;
131 #endif
132
133 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
134 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
135
136 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
137 static int maxolduid = 65535;
138 static int minolduid;
139 static int min_percpu_pagelist_fract = 8;
140
141 static int ngroups_max = NGROUPS_MAX;
142 static 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
146 static 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
156 extern int sysctl_tsb_ratio;
157 #endif
158
159 #ifdef __hppa__
160 extern int pwrsw_enabled;
161 #endif
162
163 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
164 extern int unaligned_enabled;
165 #endif
166
167 #ifdef CONFIG_IA64
168 extern int unaligned_dump_stack;
169 #endif
170
171 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
172 extern int no_unaligned_warning;
173 #endif
174
175 #ifdef CONFIG_PROC_SYSCTL
176 static int proc_do_cad_pid(struct ctl_table *table, int write,
177 void __user *buffer, size_t *lenp, loff_t *ppos);
178 static 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
183 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
184 void __user *buffer, size_t *lenp, loff_t *ppos);
185 #endif
186
187 static 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
190 static 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 */
196 static int __sysrq_enabled = CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE;
197
198 static 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
216 static struct ctl_table kern_table[];
217 static struct ctl_table vm_table[];
218 static struct ctl_table fs_table[];
219 static struct ctl_table debug_table[];
220 static struct ctl_table dev_table[];
221 extern struct ctl_table random_table[];
222 #ifdef CONFIG_EPOLL
223 extern struct ctl_table epoll_table[];
224 #endif
225
226 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
227 int sysctl_legacy_va_layout;
228 #endif
229
230 /* The default sysctl tables: */
231
232 static 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
262 static int min_sched_granularity_ns = 100000; /* 100 usecs */
263 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
264 static int min_wakeup_granularity_ns; /* 0 usecs */
265 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
266 #ifdef CONFIG_SMP
267 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
268 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
269 #endif /* CONFIG_SMP */
270 #endif /* CONFIG_SCHED_DEBUG */
271
272 #ifdef CONFIG_COMPACTION
273 static int min_extfrag_threshold;
274 static int max_extfrag_threshold = 1000;
275 #endif
276
277 static 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 #ifdef CONFIG_UEVENT_HELPER
647 {
648 .procname = "hotplug",
649 .data = &uevent_helper,
650 .maxlen = UEVENT_HELPER_PATH_LEN,
651 .mode = 0644,
652 .proc_handler = proc_dostring,
653 },
654 #endif
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
1096 static 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)
1484 static struct ctl_table binfmt_misc_table[] = {
1485 { }
1486 };
1487 #endif
1488
1489 static 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
1656 static 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
1680 static struct ctl_table dev_table[] = {
1681 { }
1682 };
1683
1684 int __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
1701 static 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 */
1776 int 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
1783 static 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
1792 static 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 */
1819 static 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 */
1878 static 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
1896 static 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
1908 static 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
1927 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
1928
1929 static 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);
2004 free:
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
2015 static 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 */
2038 int 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 */
2049 static 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
2081 static 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
2091 struct do_proc_dointvec_minmax_conv_param {
2092 int *min;
2093 int *max;
2094 };
2095
2096 static 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 */
2136 int 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
2147 static 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
2159 static 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
2169 static 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
2179 static 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);
2251 free:
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
2262 static 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 */
2288 int 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 */
2311 int 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
2320 static 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
2343 static 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
2366 static 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 */
2406 int 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 */
2428 int 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 */
2451 int 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
2458 static 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 */
2497 int 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
2630 int proc_dostring(struct ctl_table *table, int write,
2631 void __user *buffer, size_t *lenp, loff_t *ppos)
2632 {
2633 return -ENOSYS;
2634 }
2635
2636 int proc_dointvec(struct ctl_table *table, int write,
2637 void __user *buffer, size_t *lenp, loff_t *ppos)
2638 {
2639 return -ENOSYS;
2640 }
2641
2642 int 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
2648 int 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
2654 int 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
2660 int 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
2666 int 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
2672 int 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 */
2686 EXPORT_SYMBOL(proc_dointvec);
2687 EXPORT_SYMBOL(proc_dointvec_jiffies);
2688 EXPORT_SYMBOL(proc_dointvec_minmax);
2689 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2690 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2691 EXPORT_SYMBOL(proc_dostring);
2692 EXPORT_SYMBOL(proc_doulongvec_minmax);
2693 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
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