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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/aio.h>
23 #include <linux/mm.h>
24 #include <linux/swap.h>
25 #include <linux/slab.h>
26 #include <linux/sysctl.h>
27 #include <linux/bitmap.h>
28 #include <linux/signal.h>
29 #include <linux/printk.h>
30 #include <linux/proc_fs.h>
31 #include <linux/security.h>
32 #include <linux/ctype.h>
33 #include <linux/kmemcheck.h>
34 #include <linux/kmemleak.h>
35 #include <linux/fs.h>
36 #include <linux/init.h>
37 #include <linux/kernel.h>
38 #include <linux/kobject.h>
39 #include <linux/net.h>
40 #include <linux/sysrq.h>
41 #include <linux/highuid.h>
42 #include <linux/writeback.h>
43 #include <linux/ratelimit.h>
44 #include <linux/compaction.h>
45 #include <linux/hugetlb.h>
46 #include <linux/initrd.h>
47 #include <linux/key.h>
48 #include <linux/times.h>
49 #include <linux/limits.h>
50 #include <linux/dcache.h>
51 #include <linux/dnotify.h>
52 #include <linux/syscalls.h>
53 #include <linux/vmstat.h>
54 #include <linux/nfs_fs.h>
55 #include <linux/acpi.h>
56 #include <linux/reboot.h>
57 #include <linux/ftrace.h>
58 #include <linux/perf_event.h>
59 #include <linux/kprobes.h>
60 #include <linux/pipe_fs_i.h>
61 #include <linux/oom.h>
62 #include <linux/kmod.h>
63 #include <linux/capability.h>
64 #include <linux/binfmts.h>
65 #include <linux/sched/sysctl.h>
66 #include <linux/kexec.h>
67 #include <linux/bpf.h>
68 #include <linux/mount.h>
69 #include <linux/efi.h>
70
71 #include <linux/uaccess.h>
72 #include <asm/processor.h>
73
74 #ifdef CONFIG_X86
75 #include <asm/nmi.h>
76 #include <asm/stacktrace.h>
77 #include <asm/io.h>
78 #endif
79 #ifdef CONFIG_SPARC
80 #include <asm/setup.h>
81 #endif
82 #ifdef CONFIG_BSD_PROCESS_ACCT
83 #include <linux/acct.h>
84 #endif
85 #ifdef CONFIG_RT_MUTEXES
86 #include <linux/rtmutex.h>
87 #endif
88 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
89 #include <linux/lockdep.h>
90 #endif
91 #ifdef CONFIG_CHR_DEV_SG
92 #include <scsi/sg.h>
93 #endif
94
95 #ifdef CONFIG_LOCKUP_DETECTOR
96 #include <linux/nmi.h>
97 #endif
98
99 #if defined(CONFIG_SYSCTL)
100
101 /* External variables not in a header file. */
102 extern int suid_dumpable;
103 #ifdef CONFIG_COREDUMP
104 extern int core_uses_pid;
105 extern char core_pattern[];
106 extern unsigned int core_pipe_limit;
107 #endif
108 #ifdef CONFIG_USER_NS
109 extern int unprivileged_userns_clone;
110 #endif
111 extern int pid_max;
112 extern int pid_max_min, pid_max_max;
113 extern int percpu_pagelist_fraction;
114 extern int latencytop_enabled;
115 extern unsigned int sysctl_nr_open_min, sysctl_nr_open_max;
116 #ifndef CONFIG_MMU
117 extern int sysctl_nr_trim_pages;
118 #endif
119
120 /* Constants used for minimum and maximum */
121 #ifdef CONFIG_LOCKUP_DETECTOR
122 static int sixty = 60;
123 #endif
124
125 static int __maybe_unused neg_one = -1;
126
127 static int zero;
128 static int __maybe_unused one = 1;
129 static int __maybe_unused two = 2;
130 static int __maybe_unused four = 4;
131 static unsigned long one_ul = 1;
132 static int one_hundred = 100;
133 static int one_thousand = 1000;
134 #ifdef CONFIG_PRINTK
135 static int ten_thousand = 10000;
136 #endif
137 #ifdef CONFIG_PERF_EVENTS
138 static int six_hundred_forty_kb = 640 * 1024;
139 #endif
140
141 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
142 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
143
144 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
145 static int maxolduid = 65535;
146 static int minolduid;
147
148 static int ngroups_max = NGROUPS_MAX;
149 static const int cap_last_cap = CAP_LAST_CAP;
150
151 /*this is needed for proc_doulongvec_minmax of sysctl_hung_task_timeout_secs */
152 #ifdef CONFIG_DETECT_HUNG_TASK
153 static unsigned long hung_task_timeout_max = (LONG_MAX/HZ);
154 #endif
155
156 #ifdef CONFIG_INOTIFY_USER
157 #include <linux/inotify.h>
158 #endif
159 #ifdef CONFIG_SPARC
160 #endif
161
162 #ifdef __hppa__
163 extern int pwrsw_enabled;
164 #endif
165
166 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
167 extern int unaligned_enabled;
168 #endif
169
170 #ifdef CONFIG_IA64
171 extern int unaligned_dump_stack;
172 #endif
173
174 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
175 extern int no_unaligned_warning;
176 #endif
177
178 #ifdef CONFIG_PROC_SYSCTL
179
180 #define SYSCTL_WRITES_LEGACY -1
181 #define SYSCTL_WRITES_WARN 0
182 #define SYSCTL_WRITES_STRICT 1
183
184 static int sysctl_writes_strict = SYSCTL_WRITES_STRICT;
185
186 static int proc_do_cad_pid(struct ctl_table *table, int write,
187 void __user *buffer, size_t *lenp, loff_t *ppos);
188 static int proc_taint(struct ctl_table *table, int write,
189 void __user *buffer, size_t *lenp, loff_t *ppos);
190 #endif
191
192 #ifdef CONFIG_PRINTK
193 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
194 void __user *buffer, size_t *lenp, loff_t *ppos);
195 #endif
196
197 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
198 void __user *buffer, size_t *lenp, loff_t *ppos);
199 #ifdef CONFIG_COREDUMP
200 static int proc_dostring_coredump(struct ctl_table *table, int write,
201 void __user *buffer, size_t *lenp, loff_t *ppos);
202 #endif
203
204 #ifdef CONFIG_MAGIC_SYSRQ
205 /* Note: sysrq code uses it's own private copy */
206 static int __sysrq_enabled = CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE;
207
208 static int sysrq_sysctl_handler(struct ctl_table *table, int write,
209 void __user *buffer, size_t *lenp,
210 loff_t *ppos)
211 {
212 int error;
213
214 error = proc_dointvec(table, write, buffer, lenp, ppos);
215 if (error)
216 return error;
217
218 if (write)
219 sysrq_toggle_support(__sysrq_enabled);
220
221 return 0;
222 }
223
224 #endif
225
226 static struct ctl_table kern_table[];
227 static struct ctl_table vm_table[];
228 static struct ctl_table fs_table[];
229 static struct ctl_table debug_table[];
230 static struct ctl_table dev_table[];
231 extern struct ctl_table random_table[];
232 #ifdef CONFIG_EPOLL
233 extern struct ctl_table epoll_table[];
234 #endif
235
236 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
237 int sysctl_legacy_va_layout;
238 #endif
239
240 /* The default sysctl tables: */
241
242 static struct ctl_table sysctl_base_table[] = {
243 {
244 .procname = "kernel",
245 .mode = 0555,
246 .child = kern_table,
247 },
248 {
249 .procname = "vm",
250 .mode = 0555,
251 .child = vm_table,
252 },
253 {
254 .procname = "fs",
255 .mode = 0555,
256 .child = fs_table,
257 },
258 {
259 .procname = "debug",
260 .mode = 0555,
261 .child = debug_table,
262 },
263 {
264 .procname = "dev",
265 .mode = 0555,
266 .child = dev_table,
267 },
268 { }
269 };
270
271 #ifdef CONFIG_SCHED_DEBUG
272 static int min_sched_granularity_ns = 100000; /* 100 usecs */
273 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
274 static int min_wakeup_granularity_ns; /* 0 usecs */
275 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
276 #ifdef CONFIG_SMP
277 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
278 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
279 #endif /* CONFIG_SMP */
280 #endif /* CONFIG_SCHED_DEBUG */
281
282 #ifdef CONFIG_COMPACTION
283 static int min_extfrag_threshold;
284 static int max_extfrag_threshold = 1000;
285 #endif
286
287 static unsigned int secure_boot_enabled;
288 int secure_boot_proc_handler(struct ctl_table *table, int write,
289 void __user *buffer, size_t *lenp, loff_t *ppos)
290 {
291 secure_boot_enabled = efi_enabled(EFI_SECURE_BOOT);
292 return proc_dointvec(table, write, buffer, lenp, ppos);
293 }
294
295 static unsigned int moksbstate_disabled;
296 int moksbstate_disabled_proc_handler(struct ctl_table *table, int write,
297 void __user *buffer, size_t *lenp, loff_t *ppos)
298 {
299 moksbstate_disabled = efi_enabled(EFI_MOKSBSTATE_DISABLED);
300 return proc_dointvec(table, write, buffer, lenp, ppos);
301 }
302
303 static struct ctl_table kern_table[] = {
304 {
305 .procname = "secure_boot",
306 .data = &secure_boot_enabled,
307 .maxlen = sizeof(unsigned int),
308 .mode = 0444,
309 .proc_handler = secure_boot_proc_handler,
310 },
311 {
312 .procname = "moksbstate_disabled",
313 .data = &moksbstate_disabled,
314 .maxlen = sizeof(unsigned int),
315 .mode = 0444,
316 .proc_handler = moksbstate_disabled_proc_handler,
317 },
318 {
319 .procname = "sched_child_runs_first",
320 .data = &sysctl_sched_child_runs_first,
321 .maxlen = sizeof(unsigned int),
322 .mode = 0644,
323 .proc_handler = proc_dointvec,
324 },
325 #ifdef CONFIG_SCHED_DEBUG
326 {
327 .procname = "sched_min_granularity_ns",
328 .data = &sysctl_sched_min_granularity,
329 .maxlen = sizeof(unsigned int),
330 .mode = 0644,
331 .proc_handler = sched_proc_update_handler,
332 .extra1 = &min_sched_granularity_ns,
333 .extra2 = &max_sched_granularity_ns,
334 },
335 {
336 .procname = "sched_latency_ns",
337 .data = &sysctl_sched_latency,
338 .maxlen = sizeof(unsigned int),
339 .mode = 0644,
340 .proc_handler = sched_proc_update_handler,
341 .extra1 = &min_sched_granularity_ns,
342 .extra2 = &max_sched_granularity_ns,
343 },
344 {
345 .procname = "sched_wakeup_granularity_ns",
346 .data = &sysctl_sched_wakeup_granularity,
347 .maxlen = sizeof(unsigned int),
348 .mode = 0644,
349 .proc_handler = sched_proc_update_handler,
350 .extra1 = &min_wakeup_granularity_ns,
351 .extra2 = &max_wakeup_granularity_ns,
352 },
353 #ifdef CONFIG_SMP
354 {
355 .procname = "sched_tunable_scaling",
356 .data = &sysctl_sched_tunable_scaling,
357 .maxlen = sizeof(enum sched_tunable_scaling),
358 .mode = 0644,
359 .proc_handler = sched_proc_update_handler,
360 .extra1 = &min_sched_tunable_scaling,
361 .extra2 = &max_sched_tunable_scaling,
362 },
363 {
364 .procname = "sched_migration_cost_ns",
365 .data = &sysctl_sched_migration_cost,
366 .maxlen = sizeof(unsigned int),
367 .mode = 0644,
368 .proc_handler = proc_dointvec,
369 },
370 {
371 .procname = "sched_nr_migrate",
372 .data = &sysctl_sched_nr_migrate,
373 .maxlen = sizeof(unsigned int),
374 .mode = 0644,
375 .proc_handler = proc_dointvec,
376 },
377 {
378 .procname = "sched_time_avg_ms",
379 .data = &sysctl_sched_time_avg,
380 .maxlen = sizeof(unsigned int),
381 .mode = 0644,
382 .proc_handler = proc_dointvec,
383 },
384 #ifdef CONFIG_SCHEDSTATS
385 {
386 .procname = "sched_schedstats",
387 .data = NULL,
388 .maxlen = sizeof(unsigned int),
389 .mode = 0644,
390 .proc_handler = sysctl_schedstats,
391 .extra1 = &zero,
392 .extra2 = &one,
393 },
394 #endif /* CONFIG_SCHEDSTATS */
395 #endif /* CONFIG_SMP */
396 #ifdef CONFIG_NUMA_BALANCING
397 {
398 .procname = "numa_balancing_scan_delay_ms",
399 .data = &sysctl_numa_balancing_scan_delay,
400 .maxlen = sizeof(unsigned int),
401 .mode = 0644,
402 .proc_handler = proc_dointvec,
403 },
404 {
405 .procname = "numa_balancing_scan_period_min_ms",
406 .data = &sysctl_numa_balancing_scan_period_min,
407 .maxlen = sizeof(unsigned int),
408 .mode = 0644,
409 .proc_handler = proc_dointvec,
410 },
411 {
412 .procname = "numa_balancing_scan_period_max_ms",
413 .data = &sysctl_numa_balancing_scan_period_max,
414 .maxlen = sizeof(unsigned int),
415 .mode = 0644,
416 .proc_handler = proc_dointvec,
417 },
418 {
419 .procname = "numa_balancing_scan_size_mb",
420 .data = &sysctl_numa_balancing_scan_size,
421 .maxlen = sizeof(unsigned int),
422 .mode = 0644,
423 .proc_handler = proc_dointvec_minmax,
424 .extra1 = &one,
425 },
426 {
427 .procname = "numa_balancing",
428 .data = NULL, /* filled in by handler */
429 .maxlen = sizeof(unsigned int),
430 .mode = 0644,
431 .proc_handler = sysctl_numa_balancing,
432 .extra1 = &zero,
433 .extra2 = &one,
434 },
435 #endif /* CONFIG_NUMA_BALANCING */
436 #endif /* CONFIG_SCHED_DEBUG */
437 {
438 .procname = "sched_rt_period_us",
439 .data = &sysctl_sched_rt_period,
440 .maxlen = sizeof(unsigned int),
441 .mode = 0644,
442 .proc_handler = sched_rt_handler,
443 },
444 {
445 .procname = "sched_rt_runtime_us",
446 .data = &sysctl_sched_rt_runtime,
447 .maxlen = sizeof(int),
448 .mode = 0644,
449 .proc_handler = sched_rt_handler,
450 },
451 {
452 .procname = "sched_rr_timeslice_ms",
453 .data = &sched_rr_timeslice,
454 .maxlen = sizeof(int),
455 .mode = 0644,
456 .proc_handler = sched_rr_handler,
457 },
458 #ifdef CONFIG_SCHED_AUTOGROUP
459 {
460 .procname = "sched_autogroup_enabled",
461 .data = &sysctl_sched_autogroup_enabled,
462 .maxlen = sizeof(unsigned int),
463 .mode = 0644,
464 .proc_handler = proc_dointvec_minmax,
465 .extra1 = &zero,
466 .extra2 = &one,
467 },
468 #endif
469 #ifdef CONFIG_CFS_BANDWIDTH
470 {
471 .procname = "sched_cfs_bandwidth_slice_us",
472 .data = &sysctl_sched_cfs_bandwidth_slice,
473 .maxlen = sizeof(unsigned int),
474 .mode = 0644,
475 .proc_handler = proc_dointvec_minmax,
476 .extra1 = &one,
477 },
478 #endif
479 #ifdef CONFIG_PROVE_LOCKING
480 {
481 .procname = "prove_locking",
482 .data = &prove_locking,
483 .maxlen = sizeof(int),
484 .mode = 0644,
485 .proc_handler = proc_dointvec,
486 },
487 #endif
488 #ifdef CONFIG_LOCK_STAT
489 {
490 .procname = "lock_stat",
491 .data = &lock_stat,
492 .maxlen = sizeof(int),
493 .mode = 0644,
494 .proc_handler = proc_dointvec,
495 },
496 #endif
497 {
498 .procname = "panic",
499 .data = &panic_timeout,
500 .maxlen = sizeof(int),
501 .mode = 0644,
502 .proc_handler = proc_dointvec,
503 },
504 #ifdef CONFIG_COREDUMP
505 {
506 .procname = "core_uses_pid",
507 .data = &core_uses_pid,
508 .maxlen = sizeof(int),
509 .mode = 0644,
510 .proc_handler = proc_dointvec,
511 },
512 {
513 .procname = "core_pattern",
514 .data = core_pattern,
515 .maxlen = CORENAME_MAX_SIZE,
516 .mode = 0644,
517 .proc_handler = proc_dostring_coredump,
518 },
519 {
520 .procname = "core_pipe_limit",
521 .data = &core_pipe_limit,
522 .maxlen = sizeof(unsigned int),
523 .mode = 0644,
524 .proc_handler = proc_dointvec,
525 },
526 #endif
527 #ifdef CONFIG_USER_NS
528 {
529 .procname = "unprivileged_userns_clone",
530 .data = &unprivileged_userns_clone,
531 .maxlen = sizeof(int),
532 .mode = 0644,
533 .proc_handler = proc_dointvec,
534 },
535 #endif
536 #ifdef CONFIG_PROC_SYSCTL
537 {
538 .procname = "tainted",
539 .maxlen = sizeof(long),
540 .mode = 0644,
541 .proc_handler = proc_taint,
542 },
543 {
544 .procname = "sysctl_writes_strict",
545 .data = &sysctl_writes_strict,
546 .maxlen = sizeof(int),
547 .mode = 0644,
548 .proc_handler = proc_dointvec_minmax,
549 .extra1 = &neg_one,
550 .extra2 = &one,
551 },
552 #endif
553 #ifdef CONFIG_LATENCYTOP
554 {
555 .procname = "latencytop",
556 .data = &latencytop_enabled,
557 .maxlen = sizeof(int),
558 .mode = 0644,
559 .proc_handler = sysctl_latencytop,
560 },
561 #endif
562 #ifdef CONFIG_BLK_DEV_INITRD
563 {
564 .procname = "real-root-dev",
565 .data = &real_root_dev,
566 .maxlen = sizeof(int),
567 .mode = 0644,
568 .proc_handler = proc_dointvec,
569 },
570 #endif
571 {
572 .procname = "print-fatal-signals",
573 .data = &print_fatal_signals,
574 .maxlen = sizeof(int),
575 .mode = 0644,
576 .proc_handler = proc_dointvec,
577 },
578 #ifdef CONFIG_SPARC
579 {
580 .procname = "reboot-cmd",
581 .data = reboot_command,
582 .maxlen = 256,
583 .mode = 0644,
584 .proc_handler = proc_dostring,
585 },
586 {
587 .procname = "stop-a",
588 .data = &stop_a_enabled,
589 .maxlen = sizeof (int),
590 .mode = 0644,
591 .proc_handler = proc_dointvec,
592 },
593 {
594 .procname = "scons-poweroff",
595 .data = &scons_pwroff,
596 .maxlen = sizeof (int),
597 .mode = 0644,
598 .proc_handler = proc_dointvec,
599 },
600 #endif
601 #ifdef CONFIG_SPARC64
602 {
603 .procname = "tsb-ratio",
604 .data = &sysctl_tsb_ratio,
605 .maxlen = sizeof (int),
606 .mode = 0644,
607 .proc_handler = proc_dointvec,
608 },
609 #endif
610 #ifdef __hppa__
611 {
612 .procname = "soft-power",
613 .data = &pwrsw_enabled,
614 .maxlen = sizeof (int),
615 .mode = 0644,
616 .proc_handler = proc_dointvec,
617 },
618 #endif
619 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
620 {
621 .procname = "unaligned-trap",
622 .data = &unaligned_enabled,
623 .maxlen = sizeof (int),
624 .mode = 0644,
625 .proc_handler = proc_dointvec,
626 },
627 #endif
628 {
629 .procname = "ctrl-alt-del",
630 .data = &C_A_D,
631 .maxlen = sizeof(int),
632 .mode = 0644,
633 .proc_handler = proc_dointvec,
634 },
635 #ifdef CONFIG_FUNCTION_TRACER
636 {
637 .procname = "ftrace_enabled",
638 .data = &ftrace_enabled,
639 .maxlen = sizeof(int),
640 .mode = 0644,
641 .proc_handler = ftrace_enable_sysctl,
642 },
643 #endif
644 #ifdef CONFIG_STACK_TRACER
645 {
646 .procname = "stack_tracer_enabled",
647 .data = &stack_tracer_enabled,
648 .maxlen = sizeof(int),
649 .mode = 0644,
650 .proc_handler = stack_trace_sysctl,
651 },
652 #endif
653 #ifdef CONFIG_TRACING
654 {
655 .procname = "ftrace_dump_on_oops",
656 .data = &ftrace_dump_on_oops,
657 .maxlen = sizeof(int),
658 .mode = 0644,
659 .proc_handler = proc_dointvec,
660 },
661 {
662 .procname = "traceoff_on_warning",
663 .data = &__disable_trace_on_warning,
664 .maxlen = sizeof(__disable_trace_on_warning),
665 .mode = 0644,
666 .proc_handler = proc_dointvec,
667 },
668 {
669 .procname = "tracepoint_printk",
670 .data = &tracepoint_printk,
671 .maxlen = sizeof(tracepoint_printk),
672 .mode = 0644,
673 .proc_handler = tracepoint_printk_sysctl,
674 },
675 #endif
676 #ifdef CONFIG_KEXEC_CORE
677 {
678 .procname = "kexec_load_disabled",
679 .data = &kexec_load_disabled,
680 .maxlen = sizeof(int),
681 .mode = 0644,
682 /* only handle a transition from default "0" to "1" */
683 .proc_handler = proc_dointvec_minmax,
684 .extra1 = &one,
685 .extra2 = &one,
686 },
687 #endif
688 #ifdef CONFIG_MODULES
689 {
690 .procname = "modprobe",
691 .data = &modprobe_path,
692 .maxlen = KMOD_PATH_LEN,
693 .mode = 0644,
694 .proc_handler = proc_dostring,
695 },
696 {
697 .procname = "modules_disabled",
698 .data = &modules_disabled,
699 .maxlen = sizeof(int),
700 .mode = 0644,
701 /* only handle a transition from default "0" to "1" */
702 .proc_handler = proc_dointvec_minmax,
703 .extra1 = &one,
704 .extra2 = &one,
705 },
706 #endif
707 #ifdef CONFIG_UEVENT_HELPER
708 {
709 .procname = "hotplug",
710 .data = &uevent_helper,
711 .maxlen = UEVENT_HELPER_PATH_LEN,
712 .mode = 0644,
713 .proc_handler = proc_dostring,
714 },
715 #endif
716 #ifdef CONFIG_CHR_DEV_SG
717 {
718 .procname = "sg-big-buff",
719 .data = &sg_big_buff,
720 .maxlen = sizeof (int),
721 .mode = 0444,
722 .proc_handler = proc_dointvec,
723 },
724 #endif
725 #ifdef CONFIG_BSD_PROCESS_ACCT
726 {
727 .procname = "acct",
728 .data = &acct_parm,
729 .maxlen = 3*sizeof(int),
730 .mode = 0644,
731 .proc_handler = proc_dointvec,
732 },
733 #endif
734 #ifdef CONFIG_MAGIC_SYSRQ
735 {
736 .procname = "sysrq",
737 .data = &__sysrq_enabled,
738 .maxlen = sizeof (int),
739 .mode = 0644,
740 .proc_handler = sysrq_sysctl_handler,
741 },
742 #endif
743 #ifdef CONFIG_PROC_SYSCTL
744 {
745 .procname = "cad_pid",
746 .data = NULL,
747 .maxlen = sizeof (int),
748 .mode = 0600,
749 .proc_handler = proc_do_cad_pid,
750 },
751 #endif
752 {
753 .procname = "threads-max",
754 .data = NULL,
755 .maxlen = sizeof(int),
756 .mode = 0644,
757 .proc_handler = sysctl_max_threads,
758 },
759 {
760 .procname = "random",
761 .mode = 0555,
762 .child = random_table,
763 },
764 {
765 .procname = "usermodehelper",
766 .mode = 0555,
767 .child = usermodehelper_table,
768 },
769 {
770 .procname = "overflowuid",
771 .data = &overflowuid,
772 .maxlen = sizeof(int),
773 .mode = 0644,
774 .proc_handler = proc_dointvec_minmax,
775 .extra1 = &minolduid,
776 .extra2 = &maxolduid,
777 },
778 {
779 .procname = "overflowgid",
780 .data = &overflowgid,
781 .maxlen = sizeof(int),
782 .mode = 0644,
783 .proc_handler = proc_dointvec_minmax,
784 .extra1 = &minolduid,
785 .extra2 = &maxolduid,
786 },
787 #ifdef CONFIG_S390
788 #ifdef CONFIG_MATHEMU
789 {
790 .procname = "ieee_emulation_warnings",
791 .data = &sysctl_ieee_emulation_warnings,
792 .maxlen = sizeof(int),
793 .mode = 0644,
794 .proc_handler = proc_dointvec,
795 },
796 #endif
797 {
798 .procname = "userprocess_debug",
799 .data = &show_unhandled_signals,
800 .maxlen = sizeof(int),
801 .mode = 0644,
802 .proc_handler = proc_dointvec,
803 },
804 #endif
805 {
806 .procname = "pid_max",
807 .data = &pid_max,
808 .maxlen = sizeof (int),
809 .mode = 0644,
810 .proc_handler = proc_dointvec_minmax,
811 .extra1 = &pid_max_min,
812 .extra2 = &pid_max_max,
813 },
814 {
815 .procname = "panic_on_oops",
816 .data = &panic_on_oops,
817 .maxlen = sizeof(int),
818 .mode = 0644,
819 .proc_handler = proc_dointvec,
820 },
821 #if defined CONFIG_PRINTK
822 {
823 .procname = "printk",
824 .data = &console_loglevel,
825 .maxlen = 4*sizeof(int),
826 .mode = 0644,
827 .proc_handler = proc_dointvec,
828 },
829 {
830 .procname = "printk_ratelimit",
831 .data = &printk_ratelimit_state.interval,
832 .maxlen = sizeof(int),
833 .mode = 0644,
834 .proc_handler = proc_dointvec_jiffies,
835 },
836 {
837 .procname = "printk_ratelimit_burst",
838 .data = &printk_ratelimit_state.burst,
839 .maxlen = sizeof(int),
840 .mode = 0644,
841 .proc_handler = proc_dointvec,
842 },
843 {
844 .procname = "printk_delay",
845 .data = &printk_delay_msec,
846 .maxlen = sizeof(int),
847 .mode = 0644,
848 .proc_handler = proc_dointvec_minmax,
849 .extra1 = &zero,
850 .extra2 = &ten_thousand,
851 },
852 {
853 .procname = "printk_devkmsg",
854 .data = devkmsg_log_str,
855 .maxlen = DEVKMSG_STR_MAX_SIZE,
856 .mode = 0644,
857 .proc_handler = devkmsg_sysctl_set_loglvl,
858 },
859 {
860 .procname = "dmesg_restrict",
861 .data = &dmesg_restrict,
862 .maxlen = sizeof(int),
863 .mode = 0644,
864 .proc_handler = proc_dointvec_minmax_sysadmin,
865 .extra1 = &zero,
866 .extra2 = &one,
867 },
868 {
869 .procname = "kptr_restrict",
870 .data = &kptr_restrict,
871 .maxlen = sizeof(int),
872 .mode = 0644,
873 .proc_handler = proc_dointvec_minmax_sysadmin,
874 .extra1 = &zero,
875 .extra2 = &two,
876 },
877 #endif
878 {
879 .procname = "ngroups_max",
880 .data = &ngroups_max,
881 .maxlen = sizeof (int),
882 .mode = 0444,
883 .proc_handler = proc_dointvec,
884 },
885 {
886 .procname = "cap_last_cap",
887 .data = (void *)&cap_last_cap,
888 .maxlen = sizeof(int),
889 .mode = 0444,
890 .proc_handler = proc_dointvec,
891 },
892 #if defined(CONFIG_LOCKUP_DETECTOR)
893 {
894 .procname = "watchdog",
895 .data = &watchdog_user_enabled,
896 .maxlen = sizeof (int),
897 .mode = 0644,
898 .proc_handler = proc_watchdog,
899 .extra1 = &zero,
900 .extra2 = &one,
901 },
902 {
903 .procname = "watchdog_thresh",
904 .data = &watchdog_thresh,
905 .maxlen = sizeof(int),
906 .mode = 0644,
907 .proc_handler = proc_watchdog_thresh,
908 .extra1 = &zero,
909 .extra2 = &sixty,
910 },
911 {
912 .procname = "nmi_watchdog",
913 .data = &nmi_watchdog_enabled,
914 .maxlen = sizeof (int),
915 .mode = 0644,
916 .proc_handler = proc_nmi_watchdog,
917 .extra1 = &zero,
918 #if defined(CONFIG_HAVE_NMI_WATCHDOG) || defined(CONFIG_HARDLOCKUP_DETECTOR)
919 .extra2 = &one,
920 #else
921 .extra2 = &zero,
922 #endif
923 },
924 {
925 .procname = "soft_watchdog",
926 .data = &soft_watchdog_enabled,
927 .maxlen = sizeof (int),
928 .mode = 0644,
929 .proc_handler = proc_soft_watchdog,
930 .extra1 = &zero,
931 .extra2 = &one,
932 },
933 {
934 .procname = "watchdog_cpumask",
935 .data = &watchdog_cpumask_bits,
936 .maxlen = NR_CPUS,
937 .mode = 0644,
938 .proc_handler = proc_watchdog_cpumask,
939 },
940 {
941 .procname = "softlockup_panic",
942 .data = &softlockup_panic,
943 .maxlen = sizeof(int),
944 .mode = 0644,
945 .proc_handler = proc_dointvec_minmax,
946 .extra1 = &zero,
947 .extra2 = &one,
948 },
949 #ifdef CONFIG_HARDLOCKUP_DETECTOR
950 {
951 .procname = "hardlockup_panic",
952 .data = &hardlockup_panic,
953 .maxlen = sizeof(int),
954 .mode = 0644,
955 .proc_handler = proc_dointvec_minmax,
956 .extra1 = &zero,
957 .extra2 = &one,
958 },
959 #endif
960 #ifdef CONFIG_SMP
961 {
962 .procname = "softlockup_all_cpu_backtrace",
963 .data = &sysctl_softlockup_all_cpu_backtrace,
964 .maxlen = sizeof(int),
965 .mode = 0644,
966 .proc_handler = proc_dointvec_minmax,
967 .extra1 = &zero,
968 .extra2 = &one,
969 },
970 {
971 .procname = "hardlockup_all_cpu_backtrace",
972 .data = &sysctl_hardlockup_all_cpu_backtrace,
973 .maxlen = sizeof(int),
974 .mode = 0644,
975 .proc_handler = proc_dointvec_minmax,
976 .extra1 = &zero,
977 .extra2 = &one,
978 },
979 #endif /* CONFIG_SMP */
980 #endif
981 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
982 {
983 .procname = "unknown_nmi_panic",
984 .data = &unknown_nmi_panic,
985 .maxlen = sizeof (int),
986 .mode = 0644,
987 .proc_handler = proc_dointvec,
988 },
989 #endif
990 #if defined(CONFIG_X86)
991 {
992 .procname = "panic_on_unrecovered_nmi",
993 .data = &panic_on_unrecovered_nmi,
994 .maxlen = sizeof(int),
995 .mode = 0644,
996 .proc_handler = proc_dointvec,
997 },
998 {
999 .procname = "panic_on_io_nmi",
1000 .data = &panic_on_io_nmi,
1001 .maxlen = sizeof(int),
1002 .mode = 0644,
1003 .proc_handler = proc_dointvec,
1004 },
1005 #ifdef CONFIG_DEBUG_STACKOVERFLOW
1006 {
1007 .procname = "panic_on_stackoverflow",
1008 .data = &sysctl_panic_on_stackoverflow,
1009 .maxlen = sizeof(int),
1010 .mode = 0644,
1011 .proc_handler = proc_dointvec,
1012 },
1013 #endif
1014 {
1015 .procname = "bootloader_type",
1016 .data = &bootloader_type,
1017 .maxlen = sizeof (int),
1018 .mode = 0444,
1019 .proc_handler = proc_dointvec,
1020 },
1021 {
1022 .procname = "bootloader_version",
1023 .data = &bootloader_version,
1024 .maxlen = sizeof (int),
1025 .mode = 0444,
1026 .proc_handler = proc_dointvec,
1027 },
1028 {
1029 .procname = "io_delay_type",
1030 .data = &io_delay_type,
1031 .maxlen = sizeof(int),
1032 .mode = 0644,
1033 .proc_handler = proc_dointvec,
1034 },
1035 #endif
1036 #if defined(CONFIG_MMU)
1037 {
1038 .procname = "randomize_va_space",
1039 .data = &randomize_va_space,
1040 .maxlen = sizeof(int),
1041 .mode = 0644,
1042 .proc_handler = proc_dointvec,
1043 },
1044 #endif
1045 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
1046 {
1047 .procname = "spin_retry",
1048 .data = &spin_retry,
1049 .maxlen = sizeof (int),
1050 .mode = 0644,
1051 .proc_handler = proc_dointvec,
1052 },
1053 #endif
1054 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
1055 {
1056 .procname = "acpi_video_flags",
1057 .data = &acpi_realmode_flags,
1058 .maxlen = sizeof (unsigned long),
1059 .mode = 0644,
1060 .proc_handler = proc_doulongvec_minmax,
1061 },
1062 #endif
1063 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
1064 {
1065 .procname = "ignore-unaligned-usertrap",
1066 .data = &no_unaligned_warning,
1067 .maxlen = sizeof (int),
1068 .mode = 0644,
1069 .proc_handler = proc_dointvec,
1070 },
1071 #endif
1072 #ifdef CONFIG_IA64
1073 {
1074 .procname = "unaligned-dump-stack",
1075 .data = &unaligned_dump_stack,
1076 .maxlen = sizeof (int),
1077 .mode = 0644,
1078 .proc_handler = proc_dointvec,
1079 },
1080 #endif
1081 #ifdef CONFIG_DETECT_HUNG_TASK
1082 {
1083 .procname = "hung_task_panic",
1084 .data = &sysctl_hung_task_panic,
1085 .maxlen = sizeof(int),
1086 .mode = 0644,
1087 .proc_handler = proc_dointvec_minmax,
1088 .extra1 = &zero,
1089 .extra2 = &one,
1090 },
1091 {
1092 .procname = "hung_task_check_count",
1093 .data = &sysctl_hung_task_check_count,
1094 .maxlen = sizeof(int),
1095 .mode = 0644,
1096 .proc_handler = proc_dointvec_minmax,
1097 .extra1 = &zero,
1098 },
1099 {
1100 .procname = "hung_task_timeout_secs",
1101 .data = &sysctl_hung_task_timeout_secs,
1102 .maxlen = sizeof(unsigned long),
1103 .mode = 0644,
1104 .proc_handler = proc_dohung_task_timeout_secs,
1105 .extra2 = &hung_task_timeout_max,
1106 },
1107 {
1108 .procname = "hung_task_warnings",
1109 .data = &sysctl_hung_task_warnings,
1110 .maxlen = sizeof(int),
1111 .mode = 0644,
1112 .proc_handler = proc_dointvec_minmax,
1113 .extra1 = &neg_one,
1114 },
1115 #endif
1116 #ifdef CONFIG_RT_MUTEXES
1117 {
1118 .procname = "max_lock_depth",
1119 .data = &max_lock_depth,
1120 .maxlen = sizeof(int),
1121 .mode = 0644,
1122 .proc_handler = proc_dointvec,
1123 },
1124 #endif
1125 {
1126 .procname = "poweroff_cmd",
1127 .data = &poweroff_cmd,
1128 .maxlen = POWEROFF_CMD_PATH_LEN,
1129 .mode = 0644,
1130 .proc_handler = proc_dostring,
1131 },
1132 #ifdef CONFIG_KEYS
1133 {
1134 .procname = "keys",
1135 .mode = 0555,
1136 .child = key_sysctls,
1137 },
1138 #endif
1139 #ifdef CONFIG_PERF_EVENTS
1140 /*
1141 * User-space scripts rely on the existence of this file
1142 * as a feature check for perf_events being enabled.
1143 *
1144 * So it's an ABI, do not remove!
1145 */
1146 {
1147 .procname = "perf_event_paranoid",
1148 .data = &sysctl_perf_event_paranoid,
1149 .maxlen = sizeof(sysctl_perf_event_paranoid),
1150 .mode = 0644,
1151 .proc_handler = proc_dointvec,
1152 },
1153 {
1154 .procname = "perf_event_mlock_kb",
1155 .data = &sysctl_perf_event_mlock,
1156 .maxlen = sizeof(sysctl_perf_event_mlock),
1157 .mode = 0644,
1158 .proc_handler = proc_dointvec,
1159 },
1160 {
1161 .procname = "perf_event_max_sample_rate",
1162 .data = &sysctl_perf_event_sample_rate,
1163 .maxlen = sizeof(sysctl_perf_event_sample_rate),
1164 .mode = 0644,
1165 .proc_handler = perf_proc_update_handler,
1166 .extra1 = &one,
1167 },
1168 {
1169 .procname = "perf_cpu_time_max_percent",
1170 .data = &sysctl_perf_cpu_time_max_percent,
1171 .maxlen = sizeof(sysctl_perf_cpu_time_max_percent),
1172 .mode = 0644,
1173 .proc_handler = perf_cpu_time_max_percent_handler,
1174 .extra1 = &zero,
1175 .extra2 = &one_hundred,
1176 },
1177 {
1178 .procname = "perf_event_max_stack",
1179 .data = &sysctl_perf_event_max_stack,
1180 .maxlen = sizeof(sysctl_perf_event_max_stack),
1181 .mode = 0644,
1182 .proc_handler = perf_event_max_stack_handler,
1183 .extra1 = &zero,
1184 .extra2 = &six_hundred_forty_kb,
1185 },
1186 {
1187 .procname = "perf_event_max_contexts_per_stack",
1188 .data = &sysctl_perf_event_max_contexts_per_stack,
1189 .maxlen = sizeof(sysctl_perf_event_max_contexts_per_stack),
1190 .mode = 0644,
1191 .proc_handler = perf_event_max_stack_handler,
1192 .extra1 = &zero,
1193 .extra2 = &one_thousand,
1194 },
1195 #endif
1196 #ifdef CONFIG_KMEMCHECK
1197 {
1198 .procname = "kmemcheck",
1199 .data = &kmemcheck_enabled,
1200 .maxlen = sizeof(int),
1201 .mode = 0644,
1202 .proc_handler = proc_dointvec,
1203 },
1204 #endif
1205 {
1206 .procname = "panic_on_warn",
1207 .data = &panic_on_warn,
1208 .maxlen = sizeof(int),
1209 .mode = 0644,
1210 .proc_handler = proc_dointvec_minmax,
1211 .extra1 = &zero,
1212 .extra2 = &one,
1213 },
1214 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
1215 {
1216 .procname = "timer_migration",
1217 .data = &sysctl_timer_migration,
1218 .maxlen = sizeof(unsigned int),
1219 .mode = 0644,
1220 .proc_handler = timer_migration_handler,
1221 },
1222 #endif
1223 #ifdef CONFIG_BPF_SYSCALL
1224 {
1225 .procname = "unprivileged_bpf_disabled",
1226 .data = &sysctl_unprivileged_bpf_disabled,
1227 .maxlen = sizeof(sysctl_unprivileged_bpf_disabled),
1228 .mode = 0644,
1229 /* only handle a transition from default "0" to "1" */
1230 .proc_handler = proc_dointvec_minmax,
1231 .extra1 = &one,
1232 .extra2 = &one,
1233 },
1234 #endif
1235 #if defined(CONFIG_TREE_RCU) || defined(CONFIG_PREEMPT_RCU)
1236 {
1237 .procname = "panic_on_rcu_stall",
1238 .data = &sysctl_panic_on_rcu_stall,
1239 .maxlen = sizeof(sysctl_panic_on_rcu_stall),
1240 .mode = 0644,
1241 .proc_handler = proc_dointvec_minmax,
1242 .extra1 = &zero,
1243 .extra2 = &one,
1244 },
1245 #endif
1246 { }
1247 };
1248
1249 static struct ctl_table vm_table[] = {
1250 {
1251 .procname = "overcommit_memory",
1252 .data = &sysctl_overcommit_memory,
1253 .maxlen = sizeof(sysctl_overcommit_memory),
1254 .mode = 0644,
1255 .proc_handler = proc_dointvec_minmax,
1256 .extra1 = &zero,
1257 .extra2 = &two,
1258 },
1259 {
1260 .procname = "panic_on_oom",
1261 .data = &sysctl_panic_on_oom,
1262 .maxlen = sizeof(sysctl_panic_on_oom),
1263 .mode = 0644,
1264 .proc_handler = proc_dointvec_minmax,
1265 .extra1 = &zero,
1266 .extra2 = &two,
1267 },
1268 {
1269 .procname = "oom_kill_allocating_task",
1270 .data = &sysctl_oom_kill_allocating_task,
1271 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1272 .mode = 0644,
1273 .proc_handler = proc_dointvec,
1274 },
1275 {
1276 .procname = "oom_dump_tasks",
1277 .data = &sysctl_oom_dump_tasks,
1278 .maxlen = sizeof(sysctl_oom_dump_tasks),
1279 .mode = 0644,
1280 .proc_handler = proc_dointvec,
1281 },
1282 {
1283 .procname = "overcommit_ratio",
1284 .data = &sysctl_overcommit_ratio,
1285 .maxlen = sizeof(sysctl_overcommit_ratio),
1286 .mode = 0644,
1287 .proc_handler = overcommit_ratio_handler,
1288 },
1289 {
1290 .procname = "overcommit_kbytes",
1291 .data = &sysctl_overcommit_kbytes,
1292 .maxlen = sizeof(sysctl_overcommit_kbytes),
1293 .mode = 0644,
1294 .proc_handler = overcommit_kbytes_handler,
1295 },
1296 {
1297 .procname = "page-cluster",
1298 .data = &page_cluster,
1299 .maxlen = sizeof(int),
1300 .mode = 0644,
1301 .proc_handler = proc_dointvec_minmax,
1302 .extra1 = &zero,
1303 },
1304 {
1305 .procname = "dirty_background_ratio",
1306 .data = &dirty_background_ratio,
1307 .maxlen = sizeof(dirty_background_ratio),
1308 .mode = 0644,
1309 .proc_handler = dirty_background_ratio_handler,
1310 .extra1 = &zero,
1311 .extra2 = &one_hundred,
1312 },
1313 {
1314 .procname = "dirty_background_bytes",
1315 .data = &dirty_background_bytes,
1316 .maxlen = sizeof(dirty_background_bytes),
1317 .mode = 0644,
1318 .proc_handler = dirty_background_bytes_handler,
1319 .extra1 = &one_ul,
1320 },
1321 {
1322 .procname = "dirty_ratio",
1323 .data = &vm_dirty_ratio,
1324 .maxlen = sizeof(vm_dirty_ratio),
1325 .mode = 0644,
1326 .proc_handler = dirty_ratio_handler,
1327 .extra1 = &zero,
1328 .extra2 = &one_hundred,
1329 },
1330 {
1331 .procname = "dirty_bytes",
1332 .data = &vm_dirty_bytes,
1333 .maxlen = sizeof(vm_dirty_bytes),
1334 .mode = 0644,
1335 .proc_handler = dirty_bytes_handler,
1336 .extra1 = &dirty_bytes_min,
1337 },
1338 {
1339 .procname = "dirty_writeback_centisecs",
1340 .data = &dirty_writeback_interval,
1341 .maxlen = sizeof(dirty_writeback_interval),
1342 .mode = 0644,
1343 .proc_handler = dirty_writeback_centisecs_handler,
1344 },
1345 {
1346 .procname = "dirty_expire_centisecs",
1347 .data = &dirty_expire_interval,
1348 .maxlen = sizeof(dirty_expire_interval),
1349 .mode = 0644,
1350 .proc_handler = proc_dointvec_minmax,
1351 .extra1 = &zero,
1352 },
1353 {
1354 .procname = "dirtytime_expire_seconds",
1355 .data = &dirtytime_expire_interval,
1356 .maxlen = sizeof(dirty_expire_interval),
1357 .mode = 0644,
1358 .proc_handler = dirtytime_interval_handler,
1359 .extra1 = &zero,
1360 },
1361 {
1362 .procname = "nr_pdflush_threads",
1363 .mode = 0444 /* read-only */,
1364 .proc_handler = pdflush_proc_obsolete,
1365 },
1366 {
1367 .procname = "swappiness",
1368 .data = &vm_swappiness,
1369 .maxlen = sizeof(vm_swappiness),
1370 .mode = 0644,
1371 .proc_handler = proc_dointvec_minmax,
1372 .extra1 = &zero,
1373 .extra2 = &one_hundred,
1374 },
1375 #ifdef CONFIG_HUGETLB_PAGE
1376 {
1377 .procname = "nr_hugepages",
1378 .data = NULL,
1379 .maxlen = sizeof(unsigned long),
1380 .mode = 0644,
1381 .proc_handler = hugetlb_sysctl_handler,
1382 },
1383 #ifdef CONFIG_NUMA
1384 {
1385 .procname = "nr_hugepages_mempolicy",
1386 .data = NULL,
1387 .maxlen = sizeof(unsigned long),
1388 .mode = 0644,
1389 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
1390 },
1391 #endif
1392 {
1393 .procname = "hugetlb_shm_group",
1394 .data = &sysctl_hugetlb_shm_group,
1395 .maxlen = sizeof(gid_t),
1396 .mode = 0644,
1397 .proc_handler = proc_dointvec,
1398 },
1399 {
1400 .procname = "hugepages_treat_as_movable",
1401 .data = &hugepages_treat_as_movable,
1402 .maxlen = sizeof(int),
1403 .mode = 0644,
1404 .proc_handler = proc_dointvec,
1405 },
1406 {
1407 .procname = "nr_overcommit_hugepages",
1408 .data = NULL,
1409 .maxlen = sizeof(unsigned long),
1410 .mode = 0644,
1411 .proc_handler = hugetlb_overcommit_handler,
1412 },
1413 #endif
1414 {
1415 .procname = "lowmem_reserve_ratio",
1416 .data = &sysctl_lowmem_reserve_ratio,
1417 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1418 .mode = 0644,
1419 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
1420 },
1421 {
1422 .procname = "drop_caches",
1423 .data = &sysctl_drop_caches,
1424 .maxlen = sizeof(int),
1425 .mode = 0644,
1426 .proc_handler = drop_caches_sysctl_handler,
1427 .extra1 = &one,
1428 .extra2 = &four,
1429 },
1430 #ifdef CONFIG_COMPACTION
1431 {
1432 .procname = "compact_memory",
1433 .data = &sysctl_compact_memory,
1434 .maxlen = sizeof(int),
1435 .mode = 0200,
1436 .proc_handler = sysctl_compaction_handler,
1437 },
1438 {
1439 .procname = "extfrag_threshold",
1440 .data = &sysctl_extfrag_threshold,
1441 .maxlen = sizeof(int),
1442 .mode = 0644,
1443 .proc_handler = sysctl_extfrag_handler,
1444 .extra1 = &min_extfrag_threshold,
1445 .extra2 = &max_extfrag_threshold,
1446 },
1447 {
1448 .procname = "compact_unevictable_allowed",
1449 .data = &sysctl_compact_unevictable_allowed,
1450 .maxlen = sizeof(int),
1451 .mode = 0644,
1452 .proc_handler = proc_dointvec,
1453 .extra1 = &zero,
1454 .extra2 = &one,
1455 },
1456
1457 #endif /* CONFIG_COMPACTION */
1458 {
1459 .procname = "min_free_kbytes",
1460 .data = &min_free_kbytes,
1461 .maxlen = sizeof(min_free_kbytes),
1462 .mode = 0644,
1463 .proc_handler = min_free_kbytes_sysctl_handler,
1464 .extra1 = &zero,
1465 },
1466 {
1467 .procname = "watermark_scale_factor",
1468 .data = &watermark_scale_factor,
1469 .maxlen = sizeof(watermark_scale_factor),
1470 .mode = 0644,
1471 .proc_handler = watermark_scale_factor_sysctl_handler,
1472 .extra1 = &one,
1473 .extra2 = &one_thousand,
1474 },
1475 {
1476 .procname = "percpu_pagelist_fraction",
1477 .data = &percpu_pagelist_fraction,
1478 .maxlen = sizeof(percpu_pagelist_fraction),
1479 .mode = 0644,
1480 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
1481 .extra1 = &zero,
1482 },
1483 #ifdef CONFIG_MMU
1484 {
1485 .procname = "max_map_count",
1486 .data = &sysctl_max_map_count,
1487 .maxlen = sizeof(sysctl_max_map_count),
1488 .mode = 0644,
1489 .proc_handler = proc_dointvec_minmax,
1490 .extra1 = &zero,
1491 },
1492 #else
1493 {
1494 .procname = "nr_trim_pages",
1495 .data = &sysctl_nr_trim_pages,
1496 .maxlen = sizeof(sysctl_nr_trim_pages),
1497 .mode = 0644,
1498 .proc_handler = proc_dointvec_minmax,
1499 .extra1 = &zero,
1500 },
1501 #endif
1502 {
1503 .procname = "laptop_mode",
1504 .data = &laptop_mode,
1505 .maxlen = sizeof(laptop_mode),
1506 .mode = 0644,
1507 .proc_handler = proc_dointvec_jiffies,
1508 },
1509 {
1510 .procname = "block_dump",
1511 .data = &block_dump,
1512 .maxlen = sizeof(block_dump),
1513 .mode = 0644,
1514 .proc_handler = proc_dointvec,
1515 .extra1 = &zero,
1516 },
1517 {
1518 .procname = "vfs_cache_pressure",
1519 .data = &sysctl_vfs_cache_pressure,
1520 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1521 .mode = 0644,
1522 .proc_handler = proc_dointvec,
1523 .extra1 = &zero,
1524 },
1525 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1526 {
1527 .procname = "legacy_va_layout",
1528 .data = &sysctl_legacy_va_layout,
1529 .maxlen = sizeof(sysctl_legacy_va_layout),
1530 .mode = 0644,
1531 .proc_handler = proc_dointvec,
1532 .extra1 = &zero,
1533 },
1534 #endif
1535 #ifdef CONFIG_NUMA
1536 {
1537 .procname = "zone_reclaim_mode",
1538 .data = &node_reclaim_mode,
1539 .maxlen = sizeof(node_reclaim_mode),
1540 .mode = 0644,
1541 .proc_handler = proc_dointvec,
1542 .extra1 = &zero,
1543 },
1544 {
1545 .procname = "min_unmapped_ratio",
1546 .data = &sysctl_min_unmapped_ratio,
1547 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1548 .mode = 0644,
1549 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
1550 .extra1 = &zero,
1551 .extra2 = &one_hundred,
1552 },
1553 {
1554 .procname = "min_slab_ratio",
1555 .data = &sysctl_min_slab_ratio,
1556 .maxlen = sizeof(sysctl_min_slab_ratio),
1557 .mode = 0644,
1558 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
1559 .extra1 = &zero,
1560 .extra2 = &one_hundred,
1561 },
1562 #endif
1563 #ifdef CONFIG_SMP
1564 {
1565 .procname = "stat_interval",
1566 .data = &sysctl_stat_interval,
1567 .maxlen = sizeof(sysctl_stat_interval),
1568 .mode = 0644,
1569 .proc_handler = proc_dointvec_jiffies,
1570 },
1571 {
1572 .procname = "stat_refresh",
1573 .data = NULL,
1574 .maxlen = 0,
1575 .mode = 0600,
1576 .proc_handler = vmstat_refresh,
1577 },
1578 #endif
1579 #ifdef CONFIG_MMU
1580 {
1581 .procname = "mmap_min_addr",
1582 .data = &dac_mmap_min_addr,
1583 .maxlen = sizeof(unsigned long),
1584 .mode = 0644,
1585 .proc_handler = mmap_min_addr_handler,
1586 },
1587 #endif
1588 #ifdef CONFIG_NUMA
1589 {
1590 .procname = "numa_zonelist_order",
1591 .data = &numa_zonelist_order,
1592 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1593 .mode = 0644,
1594 .proc_handler = numa_zonelist_order_handler,
1595 },
1596 #endif
1597 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1598 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1599 {
1600 .procname = "vdso_enabled",
1601 #ifdef CONFIG_X86_32
1602 .data = &vdso32_enabled,
1603 .maxlen = sizeof(vdso32_enabled),
1604 #else
1605 .data = &vdso_enabled,
1606 .maxlen = sizeof(vdso_enabled),
1607 #endif
1608 .mode = 0644,
1609 .proc_handler = proc_dointvec,
1610 .extra1 = &zero,
1611 },
1612 #endif
1613 #ifdef CONFIG_HIGHMEM
1614 {
1615 .procname = "highmem_is_dirtyable",
1616 .data = &vm_highmem_is_dirtyable,
1617 .maxlen = sizeof(vm_highmem_is_dirtyable),
1618 .mode = 0644,
1619 .proc_handler = proc_dointvec_minmax,
1620 .extra1 = &zero,
1621 .extra2 = &one,
1622 },
1623 #endif
1624 #ifdef CONFIG_MEMORY_FAILURE
1625 {
1626 .procname = "memory_failure_early_kill",
1627 .data = &sysctl_memory_failure_early_kill,
1628 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1629 .mode = 0644,
1630 .proc_handler = proc_dointvec_minmax,
1631 .extra1 = &zero,
1632 .extra2 = &one,
1633 },
1634 {
1635 .procname = "memory_failure_recovery",
1636 .data = &sysctl_memory_failure_recovery,
1637 .maxlen = sizeof(sysctl_memory_failure_recovery),
1638 .mode = 0644,
1639 .proc_handler = proc_dointvec_minmax,
1640 .extra1 = &zero,
1641 .extra2 = &one,
1642 },
1643 #endif
1644 {
1645 .procname = "user_reserve_kbytes",
1646 .data = &sysctl_user_reserve_kbytes,
1647 .maxlen = sizeof(sysctl_user_reserve_kbytes),
1648 .mode = 0644,
1649 .proc_handler = proc_doulongvec_minmax,
1650 },
1651 {
1652 .procname = "admin_reserve_kbytes",
1653 .data = &sysctl_admin_reserve_kbytes,
1654 .maxlen = sizeof(sysctl_admin_reserve_kbytes),
1655 .mode = 0644,
1656 .proc_handler = proc_doulongvec_minmax,
1657 },
1658 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS
1659 {
1660 .procname = "mmap_rnd_bits",
1661 .data = &mmap_rnd_bits,
1662 .maxlen = sizeof(mmap_rnd_bits),
1663 .mode = 0600,
1664 .proc_handler = proc_dointvec_minmax,
1665 .extra1 = (void *)&mmap_rnd_bits_min,
1666 .extra2 = (void *)&mmap_rnd_bits_max,
1667 },
1668 #endif
1669 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS
1670 {
1671 .procname = "mmap_rnd_compat_bits",
1672 .data = &mmap_rnd_compat_bits,
1673 .maxlen = sizeof(mmap_rnd_compat_bits),
1674 .mode = 0600,
1675 .proc_handler = proc_dointvec_minmax,
1676 .extra1 = (void *)&mmap_rnd_compat_bits_min,
1677 .extra2 = (void *)&mmap_rnd_compat_bits_max,
1678 },
1679 #endif
1680 { }
1681 };
1682
1683 static struct ctl_table fs_table[] = {
1684 {
1685 .procname = "inode-nr",
1686 .data = &inodes_stat,
1687 .maxlen = 2*sizeof(long),
1688 .mode = 0444,
1689 .proc_handler = proc_nr_inodes,
1690 },
1691 {
1692 .procname = "inode-state",
1693 .data = &inodes_stat,
1694 .maxlen = 7*sizeof(long),
1695 .mode = 0444,
1696 .proc_handler = proc_nr_inodes,
1697 },
1698 {
1699 .procname = "file-nr",
1700 .data = &files_stat,
1701 .maxlen = sizeof(files_stat),
1702 .mode = 0444,
1703 .proc_handler = proc_nr_files,
1704 },
1705 {
1706 .procname = "file-max",
1707 .data = &files_stat.max_files,
1708 .maxlen = sizeof(files_stat.max_files),
1709 .mode = 0644,
1710 .proc_handler = proc_doulongvec_minmax,
1711 },
1712 {
1713 .procname = "nr_open",
1714 .data = &sysctl_nr_open,
1715 .maxlen = sizeof(unsigned int),
1716 .mode = 0644,
1717 .proc_handler = proc_dointvec_minmax,
1718 .extra1 = &sysctl_nr_open_min,
1719 .extra2 = &sysctl_nr_open_max,
1720 },
1721 {
1722 .procname = "dentry-state",
1723 .data = &dentry_stat,
1724 .maxlen = 6*sizeof(long),
1725 .mode = 0444,
1726 .proc_handler = proc_nr_dentry,
1727 },
1728 {
1729 .procname = "overflowuid",
1730 .data = &fs_overflowuid,
1731 .maxlen = sizeof(int),
1732 .mode = 0644,
1733 .proc_handler = proc_dointvec_minmax,
1734 .extra1 = &minolduid,
1735 .extra2 = &maxolduid,
1736 },
1737 {
1738 .procname = "overflowgid",
1739 .data = &fs_overflowgid,
1740 .maxlen = sizeof(int),
1741 .mode = 0644,
1742 .proc_handler = proc_dointvec_minmax,
1743 .extra1 = &minolduid,
1744 .extra2 = &maxolduid,
1745 },
1746 #ifdef CONFIG_FILE_LOCKING
1747 {
1748 .procname = "leases-enable",
1749 .data = &leases_enable,
1750 .maxlen = sizeof(int),
1751 .mode = 0644,
1752 .proc_handler = proc_dointvec,
1753 },
1754 #endif
1755 #ifdef CONFIG_DNOTIFY
1756 {
1757 .procname = "dir-notify-enable",
1758 .data = &dir_notify_enable,
1759 .maxlen = sizeof(int),
1760 .mode = 0644,
1761 .proc_handler = proc_dointvec,
1762 },
1763 #endif
1764 #ifdef CONFIG_MMU
1765 #ifdef CONFIG_FILE_LOCKING
1766 {
1767 .procname = "lease-break-time",
1768 .data = &lease_break_time,
1769 .maxlen = sizeof(int),
1770 .mode = 0644,
1771 .proc_handler = proc_dointvec,
1772 },
1773 #endif
1774 #ifdef CONFIG_AIO
1775 {
1776 .procname = "aio-nr",
1777 .data = &aio_nr,
1778 .maxlen = sizeof(aio_nr),
1779 .mode = 0444,
1780 .proc_handler = proc_doulongvec_minmax,
1781 },
1782 {
1783 .procname = "aio-max-nr",
1784 .data = &aio_max_nr,
1785 .maxlen = sizeof(aio_max_nr),
1786 .mode = 0644,
1787 .proc_handler = proc_doulongvec_minmax,
1788 },
1789 #endif /* CONFIG_AIO */
1790 #ifdef CONFIG_INOTIFY_USER
1791 {
1792 .procname = "inotify",
1793 .mode = 0555,
1794 .child = inotify_table,
1795 },
1796 #endif
1797 #ifdef CONFIG_EPOLL
1798 {
1799 .procname = "epoll",
1800 .mode = 0555,
1801 .child = epoll_table,
1802 },
1803 #endif
1804 #endif
1805 {
1806 .procname = "protected_symlinks",
1807 .data = &sysctl_protected_symlinks,
1808 .maxlen = sizeof(int),
1809 .mode = 0600,
1810 .proc_handler = proc_dointvec_minmax,
1811 .extra1 = &zero,
1812 .extra2 = &one,
1813 },
1814 {
1815 .procname = "protected_hardlinks",
1816 .data = &sysctl_protected_hardlinks,
1817 .maxlen = sizeof(int),
1818 .mode = 0600,
1819 .proc_handler = proc_dointvec_minmax,
1820 .extra1 = &zero,
1821 .extra2 = &one,
1822 },
1823 {
1824 .procname = "suid_dumpable",
1825 .data = &suid_dumpable,
1826 .maxlen = sizeof(int),
1827 .mode = 0644,
1828 .proc_handler = proc_dointvec_minmax_coredump,
1829 .extra1 = &zero,
1830 .extra2 = &two,
1831 },
1832 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1833 {
1834 .procname = "binfmt_misc",
1835 .mode = 0555,
1836 .child = sysctl_mount_point,
1837 },
1838 #endif
1839 {
1840 .procname = "pipe-max-size",
1841 .data = &pipe_max_size,
1842 .maxlen = sizeof(int),
1843 .mode = 0644,
1844 .proc_handler = &pipe_proc_fn,
1845 .extra1 = &pipe_min_size,
1846 },
1847 {
1848 .procname = "pipe-user-pages-hard",
1849 .data = &pipe_user_pages_hard,
1850 .maxlen = sizeof(pipe_user_pages_hard),
1851 .mode = 0644,
1852 .proc_handler = proc_doulongvec_minmax,
1853 },
1854 {
1855 .procname = "pipe-user-pages-soft",
1856 .data = &pipe_user_pages_soft,
1857 .maxlen = sizeof(pipe_user_pages_soft),
1858 .mode = 0644,
1859 .proc_handler = proc_doulongvec_minmax,
1860 },
1861 {
1862 .procname = "mount-max",
1863 .data = &sysctl_mount_max,
1864 .maxlen = sizeof(unsigned int),
1865 .mode = 0644,
1866 .proc_handler = proc_dointvec_minmax,
1867 .extra1 = &one,
1868 },
1869 { }
1870 };
1871
1872 static struct ctl_table debug_table[] = {
1873 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1874 {
1875 .procname = "exception-trace",
1876 .data = &show_unhandled_signals,
1877 .maxlen = sizeof(int),
1878 .mode = 0644,
1879 .proc_handler = proc_dointvec
1880 },
1881 #endif
1882 #if defined(CONFIG_OPTPROBES)
1883 {
1884 .procname = "kprobes-optimization",
1885 .data = &sysctl_kprobes_optimization,
1886 .maxlen = sizeof(int),
1887 .mode = 0644,
1888 .proc_handler = proc_kprobes_optimization_handler,
1889 .extra1 = &zero,
1890 .extra2 = &one,
1891 },
1892 #endif
1893 { }
1894 };
1895
1896 static struct ctl_table dev_table[] = {
1897 { }
1898 };
1899
1900 int __init sysctl_init(void)
1901 {
1902 struct ctl_table_header *hdr;
1903
1904 hdr = register_sysctl_table(sysctl_base_table);
1905 kmemleak_not_leak(hdr);
1906 return 0;
1907 }
1908
1909 #endif /* CONFIG_SYSCTL */
1910
1911 /*
1912 * /proc/sys support
1913 */
1914
1915 #ifdef CONFIG_PROC_SYSCTL
1916
1917 static int _proc_do_string(char *data, int maxlen, int write,
1918 char __user *buffer,
1919 size_t *lenp, loff_t *ppos)
1920 {
1921 size_t len;
1922 char __user *p;
1923 char c;
1924
1925 if (!data || !maxlen || !*lenp) {
1926 *lenp = 0;
1927 return 0;
1928 }
1929
1930 if (write) {
1931 if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) {
1932 /* Only continue writes not past the end of buffer. */
1933 len = strlen(data);
1934 if (len > maxlen - 1)
1935 len = maxlen - 1;
1936
1937 if (*ppos > len)
1938 return 0;
1939 len = *ppos;
1940 } else {
1941 /* Start writing from beginning of buffer. */
1942 len = 0;
1943 }
1944
1945 *ppos += *lenp;
1946 p = buffer;
1947 while ((p - buffer) < *lenp && len < maxlen - 1) {
1948 if (get_user(c, p++))
1949 return -EFAULT;
1950 if (c == 0 || c == '\n')
1951 break;
1952 data[len++] = c;
1953 }
1954 data[len] = 0;
1955 } else {
1956 len = strlen(data);
1957 if (len > maxlen)
1958 len = maxlen;
1959
1960 if (*ppos > len) {
1961 *lenp = 0;
1962 return 0;
1963 }
1964
1965 data += *ppos;
1966 len -= *ppos;
1967
1968 if (len > *lenp)
1969 len = *lenp;
1970 if (len)
1971 if (copy_to_user(buffer, data, len))
1972 return -EFAULT;
1973 if (len < *lenp) {
1974 if (put_user('\n', buffer + len))
1975 return -EFAULT;
1976 len++;
1977 }
1978 *lenp = len;
1979 *ppos += len;
1980 }
1981 return 0;
1982 }
1983
1984 static void warn_sysctl_write(struct ctl_table *table)
1985 {
1986 pr_warn_once("%s wrote to %s when file position was not 0!\n"
1987 "This will not be supported in the future. To silence this\n"
1988 "warning, set kernel.sysctl_writes_strict = -1\n",
1989 current->comm, table->procname);
1990 }
1991
1992 /**
1993 * proc_dostring - read a string sysctl
1994 * @table: the sysctl table
1995 * @write: %TRUE if this is a write to the sysctl file
1996 * @buffer: the user buffer
1997 * @lenp: the size of the user buffer
1998 * @ppos: file position
1999 *
2000 * Reads/writes a string from/to the user buffer. If the kernel
2001 * buffer provided is not large enough to hold the string, the
2002 * string is truncated. The copied string is %NULL-terminated.
2003 * If the string is being read by the user process, it is copied
2004 * and a newline '\n' is added. It is truncated if the buffer is
2005 * not large enough.
2006 *
2007 * Returns 0 on success.
2008 */
2009 int proc_dostring(struct ctl_table *table, int write,
2010 void __user *buffer, size_t *lenp, loff_t *ppos)
2011 {
2012 if (write && *ppos && sysctl_writes_strict == SYSCTL_WRITES_WARN)
2013 warn_sysctl_write(table);
2014
2015 return _proc_do_string((char *)(table->data), table->maxlen, write,
2016 (char __user *)buffer, lenp, ppos);
2017 }
2018
2019 static size_t proc_skip_spaces(char **buf)
2020 {
2021 size_t ret;
2022 char *tmp = skip_spaces(*buf);
2023 ret = tmp - *buf;
2024 *buf = tmp;
2025 return ret;
2026 }
2027
2028 static void proc_skip_char(char **buf, size_t *size, const char v)
2029 {
2030 while (*size) {
2031 if (**buf != v)
2032 break;
2033 (*size)--;
2034 (*buf)++;
2035 }
2036 }
2037
2038 #define TMPBUFLEN 22
2039 /**
2040 * proc_get_long - reads an ASCII formatted integer from a user buffer
2041 *
2042 * @buf: a kernel buffer
2043 * @size: size of the kernel buffer
2044 * @val: this is where the number will be stored
2045 * @neg: set to %TRUE if number is negative
2046 * @perm_tr: a vector which contains the allowed trailers
2047 * @perm_tr_len: size of the perm_tr vector
2048 * @tr: pointer to store the trailer character
2049 *
2050 * In case of success %0 is returned and @buf and @size are updated with
2051 * the amount of bytes read. If @tr is non-NULL and a trailing
2052 * character exists (size is non-zero after returning from this
2053 * function), @tr is updated with the trailing character.
2054 */
2055 static int proc_get_long(char **buf, size_t *size,
2056 unsigned long *val, bool *neg,
2057 const char *perm_tr, unsigned perm_tr_len, char *tr)
2058 {
2059 int len;
2060 char *p, tmp[TMPBUFLEN];
2061
2062 if (!*size)
2063 return -EINVAL;
2064
2065 len = *size;
2066 if (len > TMPBUFLEN - 1)
2067 len = TMPBUFLEN - 1;
2068
2069 memcpy(tmp, *buf, len);
2070
2071 tmp[len] = 0;
2072 p = tmp;
2073 if (*p == '-' && *size > 1) {
2074 *neg = true;
2075 p++;
2076 } else
2077 *neg = false;
2078 if (!isdigit(*p))
2079 return -EINVAL;
2080
2081 *val = simple_strtoul(p, &p, 0);
2082
2083 len = p - tmp;
2084
2085 /* We don't know if the next char is whitespace thus we may accept
2086 * invalid integers (e.g. 1234...a) or two integers instead of one
2087 * (e.g. 123...1). So lets not allow such large numbers. */
2088 if (len == TMPBUFLEN - 1)
2089 return -EINVAL;
2090
2091 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
2092 return -EINVAL;
2093
2094 if (tr && (len < *size))
2095 *tr = *p;
2096
2097 *buf += len;
2098 *size -= len;
2099
2100 return 0;
2101 }
2102
2103 /**
2104 * proc_put_long - converts an integer to a decimal ASCII formatted string
2105 *
2106 * @buf: the user buffer
2107 * @size: the size of the user buffer
2108 * @val: the integer to be converted
2109 * @neg: sign of the number, %TRUE for negative
2110 *
2111 * In case of success %0 is returned and @buf and @size are updated with
2112 * the amount of bytes written.
2113 */
2114 static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
2115 bool neg)
2116 {
2117 int len;
2118 char tmp[TMPBUFLEN], *p = tmp;
2119
2120 sprintf(p, "%s%lu", neg ? "-" : "", val);
2121 len = strlen(tmp);
2122 if (len > *size)
2123 len = *size;
2124 if (copy_to_user(*buf, tmp, len))
2125 return -EFAULT;
2126 *size -= len;
2127 *buf += len;
2128 return 0;
2129 }
2130 #undef TMPBUFLEN
2131
2132 static int proc_put_char(void __user **buf, size_t *size, char c)
2133 {
2134 if (*size) {
2135 char __user **buffer = (char __user **)buf;
2136 if (put_user(c, *buffer))
2137 return -EFAULT;
2138 (*size)--, (*buffer)++;
2139 *buf = *buffer;
2140 }
2141 return 0;
2142 }
2143
2144 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
2145 int *valp,
2146 int write, void *data)
2147 {
2148 if (write) {
2149 if (*negp) {
2150 if (*lvalp > (unsigned long) INT_MAX + 1)
2151 return -EINVAL;
2152 *valp = -*lvalp;
2153 } else {
2154 if (*lvalp > (unsigned long) INT_MAX)
2155 return -EINVAL;
2156 *valp = *lvalp;
2157 }
2158 } else {
2159 int val = *valp;
2160 if (val < 0) {
2161 *negp = true;
2162 *lvalp = -(unsigned long)val;
2163 } else {
2164 *negp = false;
2165 *lvalp = (unsigned long)val;
2166 }
2167 }
2168 return 0;
2169 }
2170
2171 static int do_proc_douintvec_conv(bool *negp, unsigned long *lvalp,
2172 int *valp,
2173 int write, void *data)
2174 {
2175 if (write) {
2176 if (*negp)
2177 return -EINVAL;
2178 *valp = *lvalp;
2179 } else {
2180 unsigned int val = *valp;
2181 *lvalp = (unsigned long)val;
2182 }
2183 return 0;
2184 }
2185
2186 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
2187
2188 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
2189 int write, void __user *buffer,
2190 size_t *lenp, loff_t *ppos,
2191 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2192 int write, void *data),
2193 void *data)
2194 {
2195 int *i, vleft, first = 1, err = 0;
2196 size_t left;
2197 char *kbuf = NULL, *p;
2198
2199 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
2200 *lenp = 0;
2201 return 0;
2202 }
2203
2204 i = (int *) tbl_data;
2205 vleft = table->maxlen / sizeof(*i);
2206 left = *lenp;
2207
2208 if (!conv)
2209 conv = do_proc_dointvec_conv;
2210
2211 if (write) {
2212 if (*ppos) {
2213 switch (sysctl_writes_strict) {
2214 case SYSCTL_WRITES_STRICT:
2215 goto out;
2216 case SYSCTL_WRITES_WARN:
2217 warn_sysctl_write(table);
2218 break;
2219 default:
2220 break;
2221 }
2222 }
2223
2224 if (left > PAGE_SIZE - 1)
2225 left = PAGE_SIZE - 1;
2226 p = kbuf = memdup_user_nul(buffer, left);
2227 if (IS_ERR(kbuf))
2228 return PTR_ERR(kbuf);
2229 }
2230
2231 for (; left && vleft--; i++, first=0) {
2232 unsigned long lval;
2233 bool neg;
2234
2235 if (write) {
2236 left -= proc_skip_spaces(&p);
2237
2238 if (!left)
2239 break;
2240 err = proc_get_long(&p, &left, &lval, &neg,
2241 proc_wspace_sep,
2242 sizeof(proc_wspace_sep), NULL);
2243 if (err)
2244 break;
2245 if (conv(&neg, &lval, i, 1, data)) {
2246 err = -EINVAL;
2247 break;
2248 }
2249 } else {
2250 if (conv(&neg, &lval, i, 0, data)) {
2251 err = -EINVAL;
2252 break;
2253 }
2254 if (!first)
2255 err = proc_put_char(&buffer, &left, '\t');
2256 if (err)
2257 break;
2258 err = proc_put_long(&buffer, &left, lval, neg);
2259 if (err)
2260 break;
2261 }
2262 }
2263
2264 if (!write && !first && left && !err)
2265 err = proc_put_char(&buffer, &left, '\n');
2266 if (write && !err && left)
2267 left -= proc_skip_spaces(&p);
2268 if (write) {
2269 kfree(kbuf);
2270 if (first)
2271 return err ? : -EINVAL;
2272 }
2273 *lenp -= left;
2274 out:
2275 *ppos += *lenp;
2276 return err;
2277 }
2278
2279 static int do_proc_dointvec(struct ctl_table *table, int write,
2280 void __user *buffer, size_t *lenp, loff_t *ppos,
2281 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2282 int write, void *data),
2283 void *data)
2284 {
2285 return __do_proc_dointvec(table->data, table, write,
2286 buffer, lenp, ppos, conv, data);
2287 }
2288
2289 /**
2290 * proc_dointvec - read a vector of integers
2291 * @table: the sysctl table
2292 * @write: %TRUE if this is a write to the sysctl file
2293 * @buffer: the user buffer
2294 * @lenp: the size of the user buffer
2295 * @ppos: file position
2296 *
2297 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2298 * values from/to the user buffer, treated as an ASCII string.
2299 *
2300 * Returns 0 on success.
2301 */
2302 int proc_dointvec(struct ctl_table *table, int write,
2303 void __user *buffer, size_t *lenp, loff_t *ppos)
2304 {
2305 return do_proc_dointvec(table, write, buffer, lenp, ppos, NULL, NULL);
2306 }
2307
2308 /**
2309 * proc_douintvec - read a vector of unsigned integers
2310 * @table: the sysctl table
2311 * @write: %TRUE if this is a write to the sysctl file
2312 * @buffer: the user buffer
2313 * @lenp: the size of the user buffer
2314 * @ppos: file position
2315 *
2316 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
2317 * values from/to the user buffer, treated as an ASCII string.
2318 *
2319 * Returns 0 on success.
2320 */
2321 int proc_douintvec(struct ctl_table *table, int write,
2322 void __user *buffer, size_t *lenp, loff_t *ppos)
2323 {
2324 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2325 do_proc_douintvec_conv, NULL);
2326 }
2327
2328 /*
2329 * Taint values can only be increased
2330 * This means we can safely use a temporary.
2331 */
2332 static int proc_taint(struct ctl_table *table, int write,
2333 void __user *buffer, size_t *lenp, loff_t *ppos)
2334 {
2335 struct ctl_table t;
2336 unsigned long tmptaint = get_taint();
2337 int err;
2338
2339 if (write && !capable(CAP_SYS_ADMIN))
2340 return -EPERM;
2341
2342 t = *table;
2343 t.data = &tmptaint;
2344 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2345 if (err < 0)
2346 return err;
2347
2348 if (write) {
2349 /*
2350 * Poor man's atomic or. Not worth adding a primitive
2351 * to everyone's atomic.h for this
2352 */
2353 int i;
2354 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2355 if ((tmptaint >> i) & 1)
2356 add_taint(i, LOCKDEP_STILL_OK);
2357 }
2358 }
2359
2360 return err;
2361 }
2362
2363 #ifdef CONFIG_PRINTK
2364 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
2365 void __user *buffer, size_t *lenp, loff_t *ppos)
2366 {
2367 if (write && !capable(CAP_SYS_ADMIN))
2368 return -EPERM;
2369
2370 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2371 }
2372 #endif
2373
2374 struct do_proc_dointvec_minmax_conv_param {
2375 int *min;
2376 int *max;
2377 };
2378
2379 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2380 int *valp,
2381 int write, void *data)
2382 {
2383 struct do_proc_dointvec_minmax_conv_param *param = data;
2384 if (write) {
2385 int val = *negp ? -*lvalp : *lvalp;
2386 if ((param->min && *param->min > val) ||
2387 (param->max && *param->max < val))
2388 return -EINVAL;
2389 *valp = val;
2390 } else {
2391 int val = *valp;
2392 if (val < 0) {
2393 *negp = true;
2394 *lvalp = -(unsigned long)val;
2395 } else {
2396 *negp = false;
2397 *lvalp = (unsigned long)val;
2398 }
2399 }
2400 return 0;
2401 }
2402
2403 /**
2404 * proc_dointvec_minmax - read a vector of integers with min/max values
2405 * @table: the sysctl table
2406 * @write: %TRUE if this is a write to the sysctl file
2407 * @buffer: the user buffer
2408 * @lenp: the size of the user buffer
2409 * @ppos: file position
2410 *
2411 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2412 * values from/to the user buffer, treated as an ASCII string.
2413 *
2414 * This routine will ensure the values are within the range specified by
2415 * table->extra1 (min) and table->extra2 (max).
2416 *
2417 * Returns 0 on success.
2418 */
2419 int proc_dointvec_minmax(struct ctl_table *table, int write,
2420 void __user *buffer, size_t *lenp, loff_t *ppos)
2421 {
2422 struct do_proc_dointvec_minmax_conv_param param = {
2423 .min = (int *) table->extra1,
2424 .max = (int *) table->extra2,
2425 };
2426 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2427 do_proc_dointvec_minmax_conv, &param);
2428 }
2429
2430 static void validate_coredump_safety(void)
2431 {
2432 #ifdef CONFIG_COREDUMP
2433 if (suid_dumpable == SUID_DUMP_ROOT &&
2434 core_pattern[0] != '/' && core_pattern[0] != '|') {
2435 printk(KERN_WARNING
2436 "Unsafe core_pattern used with fs.suid_dumpable=2.\n"
2437 "Pipe handler or fully qualified core dump path required.\n"
2438 "Set kernel.core_pattern before fs.suid_dumpable.\n"
2439 );
2440 }
2441 #endif
2442 }
2443
2444 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2445 void __user *buffer, size_t *lenp, loff_t *ppos)
2446 {
2447 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2448 if (!error)
2449 validate_coredump_safety();
2450 return error;
2451 }
2452
2453 #ifdef CONFIG_COREDUMP
2454 static int proc_dostring_coredump(struct ctl_table *table, int write,
2455 void __user *buffer, size_t *lenp, loff_t *ppos)
2456 {
2457 int error = proc_dostring(table, write, buffer, lenp, ppos);
2458 if (!error)
2459 validate_coredump_safety();
2460 return error;
2461 }
2462 #endif
2463
2464 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2465 void __user *buffer,
2466 size_t *lenp, loff_t *ppos,
2467 unsigned long convmul,
2468 unsigned long convdiv)
2469 {
2470 unsigned long *i, *min, *max;
2471 int vleft, first = 1, err = 0;
2472 size_t left;
2473 char *kbuf = NULL, *p;
2474
2475 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2476 *lenp = 0;
2477 return 0;
2478 }
2479
2480 i = (unsigned long *) data;
2481 min = (unsigned long *) table->extra1;
2482 max = (unsigned long *) table->extra2;
2483 vleft = table->maxlen / sizeof(unsigned long);
2484 left = *lenp;
2485
2486 if (write) {
2487 if (*ppos) {
2488 switch (sysctl_writes_strict) {
2489 case SYSCTL_WRITES_STRICT:
2490 goto out;
2491 case SYSCTL_WRITES_WARN:
2492 warn_sysctl_write(table);
2493 break;
2494 default:
2495 break;
2496 }
2497 }
2498
2499 if (left > PAGE_SIZE - 1)
2500 left = PAGE_SIZE - 1;
2501 p = kbuf = memdup_user_nul(buffer, left);
2502 if (IS_ERR(kbuf))
2503 return PTR_ERR(kbuf);
2504 }
2505
2506 for (; left && vleft--; i++, first = 0) {
2507 unsigned long val;
2508
2509 if (write) {
2510 bool neg;
2511
2512 left -= proc_skip_spaces(&p);
2513
2514 err = proc_get_long(&p, &left, &val, &neg,
2515 proc_wspace_sep,
2516 sizeof(proc_wspace_sep), NULL);
2517 if (err)
2518 break;
2519 if (neg)
2520 continue;
2521 val = convmul * val / convdiv;
2522 if ((min && val < *min) || (max && val > *max))
2523 continue;
2524 *i = val;
2525 } else {
2526 val = convdiv * (*i) / convmul;
2527 if (!first) {
2528 err = proc_put_char(&buffer, &left, '\t');
2529 if (err)
2530 break;
2531 }
2532 err = proc_put_long(&buffer, &left, val, false);
2533 if (err)
2534 break;
2535 }
2536 }
2537
2538 if (!write && !first && left && !err)
2539 err = proc_put_char(&buffer, &left, '\n');
2540 if (write && !err)
2541 left -= proc_skip_spaces(&p);
2542 if (write) {
2543 kfree(kbuf);
2544 if (first)
2545 return err ? : -EINVAL;
2546 }
2547 *lenp -= left;
2548 out:
2549 *ppos += *lenp;
2550 return err;
2551 }
2552
2553 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2554 void __user *buffer,
2555 size_t *lenp, loff_t *ppos,
2556 unsigned long convmul,
2557 unsigned long convdiv)
2558 {
2559 return __do_proc_doulongvec_minmax(table->data, table, write,
2560 buffer, lenp, ppos, convmul, convdiv);
2561 }
2562
2563 /**
2564 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2565 * @table: the sysctl table
2566 * @write: %TRUE if this is a write to the sysctl file
2567 * @buffer: the user buffer
2568 * @lenp: the size of the user buffer
2569 * @ppos: file position
2570 *
2571 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2572 * values from/to the user buffer, treated as an ASCII string.
2573 *
2574 * This routine will ensure the values are within the range specified by
2575 * table->extra1 (min) and table->extra2 (max).
2576 *
2577 * Returns 0 on success.
2578 */
2579 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2580 void __user *buffer, size_t *lenp, loff_t *ppos)
2581 {
2582 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2583 }
2584
2585 /**
2586 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2587 * @table: the sysctl table
2588 * @write: %TRUE if this is a write to the sysctl file
2589 * @buffer: the user buffer
2590 * @lenp: the size of the user buffer
2591 * @ppos: file position
2592 *
2593 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2594 * values from/to the user buffer, treated as an ASCII string. The values
2595 * are treated as milliseconds, and converted to jiffies when they are stored.
2596 *
2597 * This routine will ensure the values are within the range specified by
2598 * table->extra1 (min) and table->extra2 (max).
2599 *
2600 * Returns 0 on success.
2601 */
2602 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2603 void __user *buffer,
2604 size_t *lenp, loff_t *ppos)
2605 {
2606 return do_proc_doulongvec_minmax(table, write, buffer,
2607 lenp, ppos, HZ, 1000l);
2608 }
2609
2610
2611 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2612 int *valp,
2613 int write, void *data)
2614 {
2615 if (write) {
2616 if (*lvalp > LONG_MAX / HZ)
2617 return 1;
2618 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2619 } else {
2620 int val = *valp;
2621 unsigned long lval;
2622 if (val < 0) {
2623 *negp = true;
2624 lval = -(unsigned long)val;
2625 } else {
2626 *negp = false;
2627 lval = (unsigned long)val;
2628 }
2629 *lvalp = lval / HZ;
2630 }
2631 return 0;
2632 }
2633
2634 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2635 int *valp,
2636 int write, void *data)
2637 {
2638 if (write) {
2639 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2640 return 1;
2641 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2642 } else {
2643 int val = *valp;
2644 unsigned long lval;
2645 if (val < 0) {
2646 *negp = true;
2647 lval = -(unsigned long)val;
2648 } else {
2649 *negp = false;
2650 lval = (unsigned long)val;
2651 }
2652 *lvalp = jiffies_to_clock_t(lval);
2653 }
2654 return 0;
2655 }
2656
2657 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2658 int *valp,
2659 int write, void *data)
2660 {
2661 if (write) {
2662 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2663
2664 if (jif > INT_MAX)
2665 return 1;
2666 *valp = (int)jif;
2667 } else {
2668 int val = *valp;
2669 unsigned long lval;
2670 if (val < 0) {
2671 *negp = true;
2672 lval = -(unsigned long)val;
2673 } else {
2674 *negp = false;
2675 lval = (unsigned long)val;
2676 }
2677 *lvalp = jiffies_to_msecs(lval);
2678 }
2679 return 0;
2680 }
2681
2682 /**
2683 * proc_dointvec_jiffies - read a vector of integers as seconds
2684 * @table: the sysctl table
2685 * @write: %TRUE if this is a write to the sysctl file
2686 * @buffer: the user buffer
2687 * @lenp: the size of the user buffer
2688 * @ppos: file position
2689 *
2690 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2691 * values from/to the user buffer, treated as an ASCII string.
2692 * The values read are assumed to be in seconds, and are converted into
2693 * jiffies.
2694 *
2695 * Returns 0 on success.
2696 */
2697 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2698 void __user *buffer, size_t *lenp, loff_t *ppos)
2699 {
2700 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2701 do_proc_dointvec_jiffies_conv,NULL);
2702 }
2703
2704 /**
2705 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2706 * @table: the sysctl table
2707 * @write: %TRUE if this is a write to the sysctl file
2708 * @buffer: the user buffer
2709 * @lenp: the size of the user buffer
2710 * @ppos: pointer to the file position
2711 *
2712 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2713 * values from/to the user buffer, treated as an ASCII string.
2714 * The values read are assumed to be in 1/USER_HZ seconds, and
2715 * are converted into jiffies.
2716 *
2717 * Returns 0 on success.
2718 */
2719 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2720 void __user *buffer, size_t *lenp, loff_t *ppos)
2721 {
2722 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2723 do_proc_dointvec_userhz_jiffies_conv,NULL);
2724 }
2725
2726 /**
2727 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2728 * @table: the sysctl table
2729 * @write: %TRUE if this is a write to the sysctl file
2730 * @buffer: the user buffer
2731 * @lenp: the size of the user buffer
2732 * @ppos: file position
2733 * @ppos: the current position in the file
2734 *
2735 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2736 * values from/to the user buffer, treated as an ASCII string.
2737 * The values read are assumed to be in 1/1000 seconds, and
2738 * are converted into jiffies.
2739 *
2740 * Returns 0 on success.
2741 */
2742 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2743 void __user *buffer, size_t *lenp, loff_t *ppos)
2744 {
2745 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2746 do_proc_dointvec_ms_jiffies_conv, NULL);
2747 }
2748
2749 static int proc_do_cad_pid(struct ctl_table *table, int write,
2750 void __user *buffer, size_t *lenp, loff_t *ppos)
2751 {
2752 struct pid *new_pid;
2753 pid_t tmp;
2754 int r;
2755
2756 tmp = pid_vnr(cad_pid);
2757
2758 r = __do_proc_dointvec(&tmp, table, write, buffer,
2759 lenp, ppos, NULL, NULL);
2760 if (r || !write)
2761 return r;
2762
2763 new_pid = find_get_pid(tmp);
2764 if (!new_pid)
2765 return -ESRCH;
2766
2767 put_pid(xchg(&cad_pid, new_pid));
2768 return 0;
2769 }
2770
2771 /**
2772 * proc_do_large_bitmap - read/write from/to a large bitmap
2773 * @table: the sysctl table
2774 * @write: %TRUE if this is a write to the sysctl file
2775 * @buffer: the user buffer
2776 * @lenp: the size of the user buffer
2777 * @ppos: file position
2778 *
2779 * The bitmap is stored at table->data and the bitmap length (in bits)
2780 * in table->maxlen.
2781 *
2782 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2783 * large bitmaps may be represented in a compact manner. Writing into
2784 * the file will clear the bitmap then update it with the given input.
2785 *
2786 * Returns 0 on success.
2787 */
2788 int proc_do_large_bitmap(struct ctl_table *table, int write,
2789 void __user *buffer, size_t *lenp, loff_t *ppos)
2790 {
2791 int err = 0;
2792 bool first = 1;
2793 size_t left = *lenp;
2794 unsigned long bitmap_len = table->maxlen;
2795 unsigned long *bitmap = *(unsigned long **) table->data;
2796 unsigned long *tmp_bitmap = NULL;
2797 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2798
2799 if (!bitmap || !bitmap_len || !left || (*ppos && !write)) {
2800 *lenp = 0;
2801 return 0;
2802 }
2803
2804 if (write) {
2805 char *kbuf, *p;
2806
2807 if (left > PAGE_SIZE - 1)
2808 left = PAGE_SIZE - 1;
2809
2810 p = kbuf = memdup_user_nul(buffer, left);
2811 if (IS_ERR(kbuf))
2812 return PTR_ERR(kbuf);
2813
2814 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
2815 GFP_KERNEL);
2816 if (!tmp_bitmap) {
2817 kfree(kbuf);
2818 return -ENOMEM;
2819 }
2820 proc_skip_char(&p, &left, '\n');
2821 while (!err && left) {
2822 unsigned long val_a, val_b;
2823 bool neg;
2824
2825 err = proc_get_long(&p, &left, &val_a, &neg, tr_a,
2826 sizeof(tr_a), &c);
2827 if (err)
2828 break;
2829 if (val_a >= bitmap_len || neg) {
2830 err = -EINVAL;
2831 break;
2832 }
2833
2834 val_b = val_a;
2835 if (left) {
2836 p++;
2837 left--;
2838 }
2839
2840 if (c == '-') {
2841 err = proc_get_long(&p, &left, &val_b,
2842 &neg, tr_b, sizeof(tr_b),
2843 &c);
2844 if (err)
2845 break;
2846 if (val_b >= bitmap_len || neg ||
2847 val_a > val_b) {
2848 err = -EINVAL;
2849 break;
2850 }
2851 if (left) {
2852 p++;
2853 left--;
2854 }
2855 }
2856
2857 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
2858 first = 0;
2859 proc_skip_char(&p, &left, '\n');
2860 }
2861 kfree(kbuf);
2862 } else {
2863 unsigned long bit_a, bit_b = 0;
2864
2865 while (left) {
2866 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
2867 if (bit_a >= bitmap_len)
2868 break;
2869 bit_b = find_next_zero_bit(bitmap, bitmap_len,
2870 bit_a + 1) - 1;
2871
2872 if (!first) {
2873 err = proc_put_char(&buffer, &left, ',');
2874 if (err)
2875 break;
2876 }
2877 err = proc_put_long(&buffer, &left, bit_a, false);
2878 if (err)
2879 break;
2880 if (bit_a != bit_b) {
2881 err = proc_put_char(&buffer, &left, '-');
2882 if (err)
2883 break;
2884 err = proc_put_long(&buffer, &left, bit_b, false);
2885 if (err)
2886 break;
2887 }
2888
2889 first = 0; bit_b++;
2890 }
2891 if (!err)
2892 err = proc_put_char(&buffer, &left, '\n');
2893 }
2894
2895 if (!err) {
2896 if (write) {
2897 if (*ppos)
2898 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
2899 else
2900 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
2901 }
2902 kfree(tmp_bitmap);
2903 *lenp -= left;
2904 *ppos += *lenp;
2905 return 0;
2906 } else {
2907 kfree(tmp_bitmap);
2908 return err;
2909 }
2910 }
2911
2912 #else /* CONFIG_PROC_SYSCTL */
2913
2914 int proc_dostring(struct ctl_table *table, int write,
2915 void __user *buffer, size_t *lenp, loff_t *ppos)
2916 {
2917 return -ENOSYS;
2918 }
2919
2920 int proc_dointvec(struct ctl_table *table, int write,
2921 void __user *buffer, size_t *lenp, loff_t *ppos)
2922 {
2923 return -ENOSYS;
2924 }
2925
2926 int proc_douintvec(struct ctl_table *table, int write,
2927 void __user *buffer, size_t *lenp, loff_t *ppos)
2928 {
2929 return -ENOSYS;
2930 }
2931
2932 int proc_dointvec_minmax(struct ctl_table *table, int write,
2933 void __user *buffer, size_t *lenp, loff_t *ppos)
2934 {
2935 return -ENOSYS;
2936 }
2937
2938 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2939 void __user *buffer, size_t *lenp, loff_t *ppos)
2940 {
2941 return -ENOSYS;
2942 }
2943
2944 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2945 void __user *buffer, size_t *lenp, loff_t *ppos)
2946 {
2947 return -ENOSYS;
2948 }
2949
2950 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2951 void __user *buffer, size_t *lenp, loff_t *ppos)
2952 {
2953 return -ENOSYS;
2954 }
2955
2956 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2957 void __user *buffer, size_t *lenp, loff_t *ppos)
2958 {
2959 return -ENOSYS;
2960 }
2961
2962 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2963 void __user *buffer,
2964 size_t *lenp, loff_t *ppos)
2965 {
2966 return -ENOSYS;
2967 }
2968
2969
2970 #endif /* CONFIG_PROC_SYSCTL */
2971
2972 /*
2973 * No sense putting this after each symbol definition, twice,
2974 * exception granted :-)
2975 */
2976 EXPORT_SYMBOL(proc_dointvec);
2977 EXPORT_SYMBOL(proc_douintvec);
2978 EXPORT_SYMBOL(proc_dointvec_jiffies);
2979 EXPORT_SYMBOL(proc_dointvec_minmax);
2980 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2981 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2982 EXPORT_SYMBOL(proc_dostring);
2983 EXPORT_SYMBOL(proc_doulongvec_minmax);
2984 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
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