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[GitHub/exynos8895/android_kernel_samsung_universal8895.git] / kernel / sysctl.c
1 /*
2 * sysctl.c: General linux system control interface
3 *
4 * Begun 24 March 1995, Stephen Tweedie
5 * Added /proc support, Dec 1995
6 * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
7 * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
8 * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
9 * Dynamic registration fixes, Stephen Tweedie.
10 * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
11 * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
12 * Horn.
13 * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
14 * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
15 * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
16 * Wendling.
17 * The list_for_each() macro wasn't appropriate for the sysctl loop.
18 * Removed it and replaced it with older style, 03/23/00, Bill Wendling
19 */
20
21 #include <linux/module.h>
22 #include <linux/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
70 #include <asm/uaccess.h>
71 #include <asm/processor.h>
72
73 #ifdef CONFIG_X86
74 #include <asm/nmi.h>
75 #include <asm/stacktrace.h>
76 #include <asm/io.h>
77 #endif
78 #ifdef CONFIG_SPARC
79 #include <asm/setup.h>
80 #endif
81 #ifdef CONFIG_BSD_PROCESS_ACCT
82 #include <linux/acct.h>
83 #endif
84 #ifdef CONFIG_RT_MUTEXES
85 #include <linux/rtmutex.h>
86 #endif
87 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
88 #include <linux/lockdep.h>
89 #endif
90 #ifdef CONFIG_CHR_DEV_SG
91 #include <scsi/sg.h>
92 #endif
93
94 #ifdef CONFIG_LOCKUP_DETECTOR
95 #include <linux/nmi.h>
96 #endif
97
98 #if defined(CONFIG_SYSCTL)
99
100 /* External variables not in a header file. */
101 #if IS_ENABLED(CONFIG_USB)
102 int deny_new_usb __read_mostly = 0;
103 EXPORT_SYMBOL(deny_new_usb);
104 #endif
105 extern int suid_dumpable;
106 #ifdef CONFIG_COREDUMP
107 extern int core_uses_pid;
108 extern char core_pattern[];
109 extern unsigned int core_pipe_limit;
110 #endif
111 extern int pid_max;
112 extern int extra_free_kbytes;
113 extern int pid_max_min, pid_max_max;
114 extern int percpu_pagelist_fraction;
115 extern int compat_log;
116 extern int latencytop_enabled;
117 extern int sysctl_nr_open_min, sysctl_nr_open_max;
118 #ifndef CONFIG_MMU
119 extern int sysctl_nr_trim_pages;
120 #endif
121
122 /* Constants used for minimum and maximum */
123 #ifdef CONFIG_LOCKUP_DETECTOR
124 static int sixty = 60;
125 #endif
126
127 static int __maybe_unused neg_one = -1;
128
129 static int zero;
130 static int __maybe_unused one = 1;
131 static int __maybe_unused two = 2;
132 static int __maybe_unused four = 4;
133 static unsigned long one_ul = 1;
134 static int one_hundred = 100;
135 #ifdef CONFIG_INCREASE_MAXIMUM_SWAPPINESS
136 static int max_swappiness = 200;
137 #endif
138 #ifdef CONFIG_PRINTK
139 static int ten_thousand = 10000;
140 #endif
141
142 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
143 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
144
145 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
146 static int maxolduid = 65535;
147 static int minolduid;
148
149 static int ngroups_max = NGROUPS_MAX;
150 static const int cap_last_cap = CAP_LAST_CAP;
151
152 /*this is needed for proc_doulongvec_minmax of sysctl_hung_task_timeout_secs */
153 #ifdef CONFIG_DETECT_HUNG_TASK
154 static unsigned long hung_task_timeout_max = (LONG_MAX/HZ);
155 #endif
156
157 #ifdef CONFIG_INOTIFY_USER
158 #include <linux/inotify.h>
159 #endif
160 #ifdef CONFIG_SPARC
161 #endif
162
163 #ifdef __hppa__
164 extern int pwrsw_enabled;
165 #endif
166
167 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
168 extern int unaligned_enabled;
169 #endif
170
171 #ifdef CONFIG_IA64
172 extern int unaligned_dump_stack;
173 #endif
174
175 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
176 extern int no_unaligned_warning;
177 #endif
178
179 #ifdef CONFIG_PROC_SYSCTL
180
181 #define SYSCTL_WRITES_LEGACY -1
182 #define SYSCTL_WRITES_WARN 0
183 #define SYSCTL_WRITES_STRICT 1
184
185 static int sysctl_writes_strict = SYSCTL_WRITES_STRICT;
186
187 static int proc_do_cad_pid(struct ctl_table *table, int write,
188 void __user *buffer, size_t *lenp, loff_t *ppos);
189 static int proc_taint(struct ctl_table *table, int write,
190 void __user *buffer, size_t *lenp, loff_t *ppos);
191 #endif
192
193 #ifdef CONFIG_PRINTK
194 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
195 void __user *buffer, size_t *lenp, loff_t *ppos);
196 #endif
197
198 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
199 void __user *buffer, size_t *lenp, loff_t *ppos);
200 #ifdef CONFIG_COREDUMP
201 static int proc_dostring_coredump(struct ctl_table *table, int write,
202 void __user *buffer, size_t *lenp, loff_t *ppos);
203 #endif
204
205 #ifdef CONFIG_MAGIC_SYSRQ
206 /* Note: sysrq code uses it's own private copy */
207 static int __sysrq_enabled = CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE;
208
209 static int sysrq_sysctl_handler(struct ctl_table *table, int write,
210 void __user *buffer, size_t *lenp,
211 loff_t *ppos)
212 {
213 int error;
214
215 error = proc_dointvec(table, write, buffer, lenp, ppos);
216 if (error)
217 return error;
218
219 if (write)
220 sysrq_toggle_support(__sysrq_enabled);
221
222 return 0;
223 }
224
225 #endif
226
227 static struct ctl_table kern_table[];
228 static struct ctl_table vm_table[];
229 static struct ctl_table fs_table[];
230 static struct ctl_table debug_table[];
231 static struct ctl_table dev_table[];
232 extern struct ctl_table random_table[];
233 #ifdef CONFIG_EPOLL
234 extern struct ctl_table epoll_table[];
235 #endif
236
237 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
238 int sysctl_legacy_va_layout;
239 #endif
240
241 /* The default sysctl tables: */
242
243 static struct ctl_table sysctl_base_table[] = {
244 {
245 .procname = "kernel",
246 .mode = 0555,
247 .child = kern_table,
248 },
249 {
250 .procname = "vm",
251 .mode = 0555,
252 .child = vm_table,
253 },
254 {
255 .procname = "fs",
256 .mode = 0555,
257 .child = fs_table,
258 },
259 {
260 .procname = "debug",
261 .mode = 0555,
262 .child = debug_table,
263 },
264 {
265 .procname = "dev",
266 .mode = 0555,
267 .child = dev_table,
268 },
269 { }
270 };
271
272 #ifdef CONFIG_SCHED_DEBUG
273 static int min_sched_granularity_ns = 100000; /* 100 usecs */
274 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
275 static int min_wakeup_granularity_ns; /* 0 usecs */
276 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
277 #ifdef CONFIG_SMP
278 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
279 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
280 #endif /* CONFIG_SMP */
281 #endif /* CONFIG_SCHED_DEBUG */
282
283 #ifdef CONFIG_COMPACTION
284 static int min_extfrag_threshold;
285 static int max_extfrag_threshold = 1000;
286 #endif
287
288 static struct ctl_table kern_table[] = {
289 {
290 .procname = "sched_child_runs_first",
291 .data = &sysctl_sched_child_runs_first,
292 .maxlen = sizeof(unsigned int),
293 .mode = 0644,
294 .proc_handler = proc_dointvec,
295 },
296 #ifdef CONFIG_SCHED_DEBUG
297 {
298 .procname = "sched_min_granularity_ns",
299 .data = &sysctl_sched_min_granularity,
300 .maxlen = sizeof(unsigned int),
301 .mode = 0644,
302 .proc_handler = sched_proc_update_handler,
303 .extra1 = &min_sched_granularity_ns,
304 .extra2 = &max_sched_granularity_ns,
305 },
306 {
307 .procname = "sched_latency_ns",
308 .data = &sysctl_sched_latency,
309 .maxlen = sizeof(unsigned int),
310 .mode = 0644,
311 .proc_handler = sched_proc_update_handler,
312 .extra1 = &min_sched_granularity_ns,
313 .extra2 = &max_sched_granularity_ns,
314 },
315 #ifdef CONFIG_SCHED_WALT
316 {
317 .procname = "sched_use_walt_cpu_util",
318 .data = &sysctl_sched_use_walt_cpu_util,
319 .maxlen = sizeof(unsigned int),
320 .mode = 0644,
321 .proc_handler = proc_dointvec,
322 },
323 {
324 .procname = "sched_use_walt_task_util",
325 .data = &sysctl_sched_use_walt_task_util,
326 .maxlen = sizeof(unsigned int),
327 .mode = 0644,
328 .proc_handler = proc_dointvec,
329 },
330 {
331 .procname = "sched_walt_init_task_load_pct",
332 .data = &sysctl_sched_walt_init_task_load_pct,
333 .maxlen = sizeof(unsigned int),
334 .mode = 0644,
335 .proc_handler = proc_dointvec,
336 },
337 {
338 .procname = "sched_walt_cpu_high_irqload",
339 .data = &sysctl_sched_walt_cpu_high_irqload,
340 .maxlen = sizeof(unsigned int),
341 .mode = 0644,
342 .proc_handler = proc_dointvec,
343 },
344 #endif
345 {
346 .procname = "sched_wakeup_granularity_ns",
347 .data = &sysctl_sched_wakeup_granularity,
348 .maxlen = sizeof(unsigned int),
349 .mode = 0644,
350 .proc_handler = sched_proc_update_handler,
351 .extra1 = &min_wakeup_granularity_ns,
352 .extra2 = &max_wakeup_granularity_ns,
353 },
354 #ifdef CONFIG_SMP
355 {
356 .procname = "sched_tunable_scaling",
357 .data = &sysctl_sched_tunable_scaling,
358 .maxlen = sizeof(enum sched_tunable_scaling),
359 .mode = 0644,
360 .proc_handler = sched_proc_update_handler,
361 .extra1 = &min_sched_tunable_scaling,
362 .extra2 = &max_sched_tunable_scaling,
363 },
364 {
365 .procname = "sched_migration_cost_ns",
366 .data = &sysctl_sched_migration_cost,
367 .maxlen = sizeof(unsigned int),
368 .mode = 0644,
369 .proc_handler = proc_dointvec,
370 },
371 {
372 .procname = "sched_nr_migrate",
373 .data = &sysctl_sched_nr_migrate,
374 .maxlen = sizeof(unsigned int),
375 .mode = 0644,
376 .proc_handler = proc_dointvec,
377 },
378 {
379 .procname = "sched_time_avg_ms",
380 .data = &sysctl_sched_time_avg,
381 .maxlen = sizeof(unsigned int),
382 .mode = 0644,
383 .proc_handler = proc_dointvec,
384 },
385 {
386 .procname = "sched_shares_window_ns",
387 .data = &sysctl_sched_shares_window,
388 .maxlen = sizeof(unsigned int),
389 .mode = 0644,
390 .proc_handler = proc_dointvec,
391 },
392 #endif /* CONFIG_SMP */
393 #ifdef CONFIG_NUMA_BALANCING
394 {
395 .procname = "numa_balancing_scan_delay_ms",
396 .data = &sysctl_numa_balancing_scan_delay,
397 .maxlen = sizeof(unsigned int),
398 .mode = 0644,
399 .proc_handler = proc_dointvec,
400 },
401 {
402 .procname = "numa_balancing_scan_period_min_ms",
403 .data = &sysctl_numa_balancing_scan_period_min,
404 .maxlen = sizeof(unsigned int),
405 .mode = 0644,
406 .proc_handler = proc_dointvec,
407 },
408 {
409 .procname = "numa_balancing_scan_period_max_ms",
410 .data = &sysctl_numa_balancing_scan_period_max,
411 .maxlen = sizeof(unsigned int),
412 .mode = 0644,
413 .proc_handler = proc_dointvec,
414 },
415 {
416 .procname = "numa_balancing_scan_size_mb",
417 .data = &sysctl_numa_balancing_scan_size,
418 .maxlen = sizeof(unsigned int),
419 .mode = 0644,
420 .proc_handler = proc_dointvec_minmax,
421 .extra1 = &one,
422 },
423 {
424 .procname = "numa_balancing",
425 .data = NULL, /* filled in by handler */
426 .maxlen = sizeof(unsigned int),
427 .mode = 0644,
428 .proc_handler = sysctl_numa_balancing,
429 .extra1 = &zero,
430 .extra2 = &one,
431 },
432 #endif /* CONFIG_NUMA_BALANCING */
433 #endif /* CONFIG_SCHED_DEBUG */
434 {
435 .procname = "sched_rt_period_us",
436 .data = &sysctl_sched_rt_period,
437 .maxlen = sizeof(unsigned int),
438 .mode = 0644,
439 .proc_handler = sched_rt_handler,
440 },
441 {
442 .procname = "sched_rt_runtime_us",
443 .data = &sysctl_sched_rt_runtime,
444 .maxlen = sizeof(int),
445 .mode = 0644,
446 .proc_handler = sched_rt_handler,
447 },
448 {
449 .procname = "sched_rr_timeslice_ms",
450 .data = &sched_rr_timeslice,
451 .maxlen = sizeof(int),
452 .mode = 0644,
453 .proc_handler = sched_rr_handler,
454 },
455 #ifdef CONFIG_SCHED_USE_FLUID_RT
456 {
457 .procname = "sysctl_sched_restrict_cluster_spill",
458 .data = &sysctl_sched_restrict_cluster_spill,
459 .maxlen = sizeof(unsigned int),
460 .mode = 0644,
461 .proc_handler = proc_dointvec,
462 },
463 #endif
464 #ifdef CONFIG_SCHED_AUTOGROUP
465 {
466 .procname = "sched_autogroup_enabled",
467 .data = &sysctl_sched_autogroup_enabled,
468 .maxlen = sizeof(unsigned int),
469 .mode = 0644,
470 .proc_handler = proc_dointvec_minmax,
471 .extra1 = &zero,
472 .extra2 = &one,
473 },
474 #endif
475 #ifdef CONFIG_CFS_BANDWIDTH
476 {
477 .procname = "sched_cfs_bandwidth_slice_us",
478 .data = &sysctl_sched_cfs_bandwidth_slice,
479 .maxlen = sizeof(unsigned int),
480 .mode = 0644,
481 .proc_handler = proc_dointvec_minmax,
482 .extra1 = &one,
483 },
484 #endif
485 #ifdef CONFIG_SCHED_TUNE
486 {
487 .procname = "sched_cfs_boost",
488 .data = &sysctl_sched_cfs_boost,
489 .maxlen = sizeof(sysctl_sched_cfs_boost),
490 #ifdef CONFIG_CGROUP_SCHEDTUNE
491 .mode = 0444,
492 #else
493 .mode = 0644,
494 #endif
495 .proc_handler = &sysctl_sched_cfs_boost_handler,
496 .extra1 = &zero,
497 .extra2 = &one_hundred,
498 },
499 #endif
500 #ifdef CONFIG_PROVE_LOCKING
501 {
502 .procname = "prove_locking",
503 .data = &prove_locking,
504 .maxlen = sizeof(int),
505 .mode = 0644,
506 .proc_handler = proc_dointvec,
507 },
508 #endif
509 #ifdef CONFIG_LOCK_STAT
510 {
511 .procname = "lock_stat",
512 .data = &lock_stat,
513 .maxlen = sizeof(int),
514 .mode = 0644,
515 .proc_handler = proc_dointvec,
516 },
517 #endif
518 {
519 .procname = "panic",
520 .data = &panic_timeout,
521 .maxlen = sizeof(int),
522 .mode = 0644,
523 .proc_handler = proc_dointvec,
524 },
525 #ifdef CONFIG_COREDUMP
526 {
527 .procname = "core_uses_pid",
528 .data = &core_uses_pid,
529 .maxlen = sizeof(int),
530 .mode = 0644,
531 .proc_handler = proc_dointvec,
532 },
533 {
534 .procname = "core_pattern",
535 .data = core_pattern,
536 .maxlen = CORENAME_MAX_SIZE,
537 .mode = 0644,
538 .proc_handler = proc_dostring_coredump,
539 },
540 {
541 .procname = "core_pipe_limit",
542 .data = &core_pipe_limit,
543 .maxlen = sizeof(unsigned int),
544 .mode = 0644,
545 .proc_handler = proc_dointvec,
546 },
547 #endif
548 #ifdef CONFIG_PROC_SYSCTL
549 {
550 .procname = "tainted",
551 .maxlen = sizeof(long),
552 .mode = 0644,
553 .proc_handler = proc_taint,
554 },
555 {
556 .procname = "sysctl_writes_strict",
557 .data = &sysctl_writes_strict,
558 .maxlen = sizeof(int),
559 .mode = 0644,
560 .proc_handler = proc_dointvec_minmax,
561 .extra1 = &neg_one,
562 .extra2 = &one,
563 },
564 #endif
565 #ifdef CONFIG_LATENCYTOP
566 {
567 .procname = "latencytop",
568 .data = &latencytop_enabled,
569 .maxlen = sizeof(int),
570 .mode = 0644,
571 .proc_handler = proc_dointvec,
572 },
573 #endif
574 #ifdef CONFIG_BLK_DEV_INITRD
575 {
576 .procname = "real-root-dev",
577 .data = &real_root_dev,
578 .maxlen = sizeof(int),
579 .mode = 0644,
580 .proc_handler = proc_dointvec,
581 },
582 #endif
583 {
584 .procname = "print-fatal-signals",
585 .data = &print_fatal_signals,
586 .maxlen = sizeof(int),
587 .mode = 0644,
588 .proc_handler = proc_dointvec,
589 },
590 #ifdef CONFIG_SPARC
591 {
592 .procname = "reboot-cmd",
593 .data = reboot_command,
594 .maxlen = 256,
595 .mode = 0644,
596 .proc_handler = proc_dostring,
597 },
598 {
599 .procname = "stop-a",
600 .data = &stop_a_enabled,
601 .maxlen = sizeof (int),
602 .mode = 0644,
603 .proc_handler = proc_dointvec,
604 },
605 {
606 .procname = "scons-poweroff",
607 .data = &scons_pwroff,
608 .maxlen = sizeof (int),
609 .mode = 0644,
610 .proc_handler = proc_dointvec,
611 },
612 #endif
613 #ifdef CONFIG_SPARC64
614 {
615 .procname = "tsb-ratio",
616 .data = &sysctl_tsb_ratio,
617 .maxlen = sizeof (int),
618 .mode = 0644,
619 .proc_handler = proc_dointvec,
620 },
621 #endif
622 #ifdef __hppa__
623 {
624 .procname = "soft-power",
625 .data = &pwrsw_enabled,
626 .maxlen = sizeof (int),
627 .mode = 0644,
628 .proc_handler = proc_dointvec,
629 },
630 #endif
631 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
632 {
633 .procname = "unaligned-trap",
634 .data = &unaligned_enabled,
635 .maxlen = sizeof (int),
636 .mode = 0644,
637 .proc_handler = proc_dointvec,
638 },
639 #endif
640 {
641 .procname = "ctrl-alt-del",
642 .data = &C_A_D,
643 .maxlen = sizeof(int),
644 .mode = 0644,
645 .proc_handler = proc_dointvec,
646 },
647 #ifdef CONFIG_FUNCTION_TRACER
648 {
649 .procname = "ftrace_enabled",
650 .data = &ftrace_enabled,
651 .maxlen = sizeof(int),
652 .mode = 0644,
653 .proc_handler = ftrace_enable_sysctl,
654 },
655 #endif
656 #ifdef CONFIG_STACK_TRACER
657 {
658 .procname = "stack_tracer_enabled",
659 .data = &stack_tracer_enabled,
660 .maxlen = sizeof(int),
661 .mode = 0644,
662 .proc_handler = stack_trace_sysctl,
663 },
664 #endif
665 #ifdef CONFIG_TRACING
666 {
667 .procname = "ftrace_dump_on_oops",
668 .data = &ftrace_dump_on_oops,
669 .maxlen = sizeof(int),
670 .mode = 0644,
671 .proc_handler = proc_dointvec,
672 },
673 {
674 .procname = "traceoff_on_warning",
675 .data = &__disable_trace_on_warning,
676 .maxlen = sizeof(__disable_trace_on_warning),
677 .mode = 0644,
678 .proc_handler = proc_dointvec,
679 },
680 {
681 .procname = "tracepoint_printk",
682 .data = &tracepoint_printk,
683 .maxlen = sizeof(tracepoint_printk),
684 .mode = 0644,
685 .proc_handler = proc_dointvec,
686 },
687 #endif
688 #ifdef CONFIG_KEXEC_CORE
689 {
690 .procname = "kexec_load_disabled",
691 .data = &kexec_load_disabled,
692 .maxlen = sizeof(int),
693 .mode = 0644,
694 /* only handle a transition from default "0" to "1" */
695 .proc_handler = proc_dointvec_minmax,
696 .extra1 = &one,
697 .extra2 = &one,
698 },
699 #endif
700 #ifdef CONFIG_MODULES
701 {
702 .procname = "modprobe",
703 .data = &modprobe_path,
704 .maxlen = KMOD_PATH_LEN,
705 .mode = 0644,
706 .proc_handler = proc_dostring,
707 },
708 {
709 .procname = "modules_disabled",
710 .data = &modules_disabled,
711 .maxlen = sizeof(int),
712 .mode = 0644,
713 /* only handle a transition from default "0" to "1" */
714 .proc_handler = proc_dointvec_minmax,
715 .extra1 = &one,
716 .extra2 = &one,
717 },
718 #endif
719 #ifdef CONFIG_UEVENT_HELPER
720 {
721 .procname = "hotplug",
722 .data = &uevent_helper,
723 .maxlen = UEVENT_HELPER_PATH_LEN,
724 .mode = 0644,
725 .proc_handler = proc_dostring,
726 },
727 #endif
728 #ifdef CONFIG_CHR_DEV_SG
729 {
730 .procname = "sg-big-buff",
731 .data = &sg_big_buff,
732 .maxlen = sizeof (int),
733 .mode = 0444,
734 .proc_handler = proc_dointvec,
735 },
736 #endif
737 #ifdef CONFIG_BSD_PROCESS_ACCT
738 {
739 .procname = "acct",
740 .data = &acct_parm,
741 .maxlen = 3*sizeof(int),
742 .mode = 0644,
743 .proc_handler = proc_dointvec,
744 },
745 #endif
746 #ifdef CONFIG_MAGIC_SYSRQ
747 {
748 .procname = "sysrq",
749 .data = &__sysrq_enabled,
750 .maxlen = sizeof (int),
751 .mode = 0644,
752 .proc_handler = sysrq_sysctl_handler,
753 },
754 #endif
755 #ifdef CONFIG_PROC_SYSCTL
756 {
757 .procname = "cad_pid",
758 .data = NULL,
759 .maxlen = sizeof (int),
760 .mode = 0600,
761 .proc_handler = proc_do_cad_pid,
762 },
763 #endif
764 {
765 .procname = "threads-max",
766 .data = NULL,
767 .maxlen = sizeof(int),
768 .mode = 0644,
769 .proc_handler = sysctl_max_threads,
770 },
771 {
772 .procname = "random",
773 .mode = 0555,
774 .child = random_table,
775 },
776 {
777 .procname = "usermodehelper",
778 .mode = 0555,
779 .child = usermodehelper_table,
780 },
781 {
782 .procname = "overflowuid",
783 .data = &overflowuid,
784 .maxlen = sizeof(int),
785 .mode = 0644,
786 .proc_handler = proc_dointvec_minmax,
787 .extra1 = &minolduid,
788 .extra2 = &maxolduid,
789 },
790 {
791 .procname = "overflowgid",
792 .data = &overflowgid,
793 .maxlen = sizeof(int),
794 .mode = 0644,
795 .proc_handler = proc_dointvec_minmax,
796 .extra1 = &minolduid,
797 .extra2 = &maxolduid,
798 },
799 #ifdef CONFIG_S390
800 #ifdef CONFIG_MATHEMU
801 {
802 .procname = "ieee_emulation_warnings",
803 .data = &sysctl_ieee_emulation_warnings,
804 .maxlen = sizeof(int),
805 .mode = 0644,
806 .proc_handler = proc_dointvec,
807 },
808 #endif
809 {
810 .procname = "userprocess_debug",
811 .data = &show_unhandled_signals,
812 .maxlen = sizeof(int),
813 .mode = 0644,
814 .proc_handler = proc_dointvec,
815 },
816 #endif
817 {
818 .procname = "pid_max",
819 .data = &pid_max,
820 .maxlen = sizeof (int),
821 .mode = 0644,
822 .proc_handler = proc_dointvec_minmax,
823 .extra1 = &pid_max_min,
824 .extra2 = &pid_max_max,
825 },
826 {
827 .procname = "panic_on_oops",
828 .data = &panic_on_oops,
829 .maxlen = sizeof(int),
830 .mode = 0644,
831 .proc_handler = proc_dointvec,
832 },
833 #if defined CONFIG_PRINTK
834 {
835 .procname = "printk",
836 .data = &console_loglevel,
837 .maxlen = 4*sizeof(int),
838 .mode = 0644,
839 .proc_handler = proc_dointvec,
840 },
841 {
842 .procname = "printk_ratelimit",
843 .data = &printk_ratelimit_state.interval,
844 .maxlen = sizeof(int),
845 .mode = 0644,
846 .proc_handler = proc_dointvec_jiffies,
847 },
848 {
849 .procname = "printk_ratelimit_burst",
850 .data = &printk_ratelimit_state.burst,
851 .maxlen = sizeof(int),
852 .mode = 0644,
853 .proc_handler = proc_dointvec,
854 },
855 {
856 .procname = "printk_delay",
857 .data = &printk_delay_msec,
858 .maxlen = sizeof(int),
859 .mode = 0644,
860 .proc_handler = proc_dointvec_minmax,
861 .extra1 = &zero,
862 .extra2 = &ten_thousand,
863 },
864 {
865 .procname = "dmesg_restrict",
866 .data = &dmesg_restrict,
867 .maxlen = sizeof(int),
868 .mode = 0644,
869 .proc_handler = proc_dointvec_minmax_sysadmin,
870 .extra1 = &zero,
871 .extra2 = &one,
872 },
873 {
874 .procname = "kptr_restrict",
875 .data = &kptr_restrict,
876 .maxlen = sizeof(int),
877 .mode = 0644,
878 .proc_handler = proc_dointvec_minmax_sysadmin,
879 .extra1 = &zero,
880 .extra2 = &two,
881 },
882 #endif
883 #if IS_ENABLED(CONFIG_USB)
884 {
885 .procname = "deny_new_usb",
886 .data = &deny_new_usb,
887 .maxlen = sizeof(int),
888 .mode = 0644,
889 .proc_handler = proc_dointvec_minmax_sysadmin,
890 .extra1 = &zero,
891 .extra2 = &one,
892 },
893 #endif
894 {
895 .procname = "ngroups_max",
896 .data = &ngroups_max,
897 .maxlen = sizeof (int),
898 .mode = 0444,
899 .proc_handler = proc_dointvec,
900 },
901 {
902 .procname = "cap_last_cap",
903 .data = (void *)&cap_last_cap,
904 .maxlen = sizeof(int),
905 .mode = 0444,
906 .proc_handler = proc_dointvec,
907 },
908 #if defined(CONFIG_LOCKUP_DETECTOR)
909 {
910 .procname = "watchdog",
911 .data = &watchdog_user_enabled,
912 .maxlen = sizeof (int),
913 .mode = 0644,
914 .proc_handler = proc_watchdog,
915 .extra1 = &zero,
916 .extra2 = &one,
917 },
918 {
919 .procname = "watchdog_thresh",
920 .data = &watchdog_thresh,
921 .maxlen = sizeof(int),
922 .mode = 0644,
923 .proc_handler = proc_watchdog_thresh,
924 .extra1 = &zero,
925 .extra2 = &sixty,
926 },
927 {
928 .procname = "nmi_watchdog",
929 .data = &nmi_watchdog_enabled,
930 .maxlen = sizeof (int),
931 .mode = 0644,
932 .proc_handler = proc_nmi_watchdog,
933 .extra1 = &zero,
934 #if defined(CONFIG_HAVE_NMI_WATCHDOG) || defined(CONFIG_HARDLOCKUP_DETECTOR)
935 .extra2 = &one,
936 #else
937 .extra2 = &zero,
938 #endif
939 },
940 {
941 .procname = "soft_watchdog",
942 .data = &soft_watchdog_enabled,
943 .maxlen = sizeof (int),
944 .mode = 0644,
945 .proc_handler = proc_soft_watchdog,
946 .extra1 = &zero,
947 .extra2 = &one,
948 },
949 {
950 .procname = "watchdog_cpumask",
951 .data = &watchdog_cpumask_bits,
952 .maxlen = NR_CPUS,
953 .mode = 0644,
954 .proc_handler = proc_watchdog_cpumask,
955 },
956 {
957 .procname = "softlockup_panic",
958 .data = &softlockup_panic,
959 .maxlen = sizeof(int),
960 .mode = 0644,
961 .proc_handler = proc_dointvec_minmax,
962 .extra1 = &zero,
963 .extra2 = &one,
964 },
965 #ifdef CONFIG_HARDLOCKUP_DETECTOR
966 {
967 .procname = "hardlockup_panic",
968 .data = &hardlockup_panic,
969 .maxlen = sizeof(int),
970 .mode = 0644,
971 .proc_handler = proc_dointvec_minmax,
972 .extra1 = &zero,
973 .extra2 = &one,
974 },
975 #endif
976 #ifdef CONFIG_SMP
977 {
978 .procname = "softlockup_all_cpu_backtrace",
979 .data = &sysctl_softlockup_all_cpu_backtrace,
980 .maxlen = sizeof(int),
981 .mode = 0644,
982 .proc_handler = proc_dointvec_minmax,
983 .extra1 = &zero,
984 .extra2 = &one,
985 },
986 {
987 .procname = "hardlockup_all_cpu_backtrace",
988 .data = &sysctl_hardlockup_all_cpu_backtrace,
989 .maxlen = sizeof(int),
990 .mode = 0644,
991 .proc_handler = proc_dointvec_minmax,
992 .extra1 = &zero,
993 .extra2 = &one,
994 },
995 #endif /* CONFIG_SMP */
996 #endif
997 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
998 {
999 .procname = "unknown_nmi_panic",
1000 .data = &unknown_nmi_panic,
1001 .maxlen = sizeof (int),
1002 .mode = 0644,
1003 .proc_handler = proc_dointvec,
1004 },
1005 #endif
1006 #if defined(CONFIG_X86)
1007 {
1008 .procname = "panic_on_unrecovered_nmi",
1009 .data = &panic_on_unrecovered_nmi,
1010 .maxlen = sizeof(int),
1011 .mode = 0644,
1012 .proc_handler = proc_dointvec,
1013 },
1014 {
1015 .procname = "panic_on_io_nmi",
1016 .data = &panic_on_io_nmi,
1017 .maxlen = sizeof(int),
1018 .mode = 0644,
1019 .proc_handler = proc_dointvec,
1020 },
1021 #ifdef CONFIG_DEBUG_STACKOVERFLOW
1022 {
1023 .procname = "panic_on_stackoverflow",
1024 .data = &sysctl_panic_on_stackoverflow,
1025 .maxlen = sizeof(int),
1026 .mode = 0644,
1027 .proc_handler = proc_dointvec,
1028 },
1029 #endif
1030 {
1031 .procname = "bootloader_type",
1032 .data = &bootloader_type,
1033 .maxlen = sizeof (int),
1034 .mode = 0444,
1035 .proc_handler = proc_dointvec,
1036 },
1037 {
1038 .procname = "bootloader_version",
1039 .data = &bootloader_version,
1040 .maxlen = sizeof (int),
1041 .mode = 0444,
1042 .proc_handler = proc_dointvec,
1043 },
1044 {
1045 .procname = "kstack_depth_to_print",
1046 .data = &kstack_depth_to_print,
1047 .maxlen = sizeof(int),
1048 .mode = 0644,
1049 .proc_handler = proc_dointvec,
1050 },
1051 {
1052 .procname = "io_delay_type",
1053 .data = &io_delay_type,
1054 .maxlen = sizeof(int),
1055 .mode = 0644,
1056 .proc_handler = proc_dointvec,
1057 },
1058 #endif
1059 #if defined(CONFIG_MMU)
1060 {
1061 .procname = "randomize_va_space",
1062 .data = &randomize_va_space,
1063 .maxlen = sizeof(int),
1064 .mode = 0644,
1065 .proc_handler = proc_dointvec,
1066 },
1067 #endif
1068 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
1069 {
1070 .procname = "spin_retry",
1071 .data = &spin_retry,
1072 .maxlen = sizeof (int),
1073 .mode = 0644,
1074 .proc_handler = proc_dointvec,
1075 },
1076 #endif
1077 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
1078 {
1079 .procname = "acpi_video_flags",
1080 .data = &acpi_realmode_flags,
1081 .maxlen = sizeof (unsigned long),
1082 .mode = 0644,
1083 .proc_handler = proc_doulongvec_minmax,
1084 },
1085 #endif
1086 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
1087 {
1088 .procname = "ignore-unaligned-usertrap",
1089 .data = &no_unaligned_warning,
1090 .maxlen = sizeof (int),
1091 .mode = 0644,
1092 .proc_handler = proc_dointvec,
1093 },
1094 #endif
1095 #ifdef CONFIG_IA64
1096 {
1097 .procname = "unaligned-dump-stack",
1098 .data = &unaligned_dump_stack,
1099 .maxlen = sizeof (int),
1100 .mode = 0644,
1101 .proc_handler = proc_dointvec,
1102 },
1103 #endif
1104 #ifdef CONFIG_DETECT_HUNG_TASK
1105 {
1106 .procname = "hung_task_panic",
1107 .data = &sysctl_hung_task_panic,
1108 .maxlen = sizeof(int),
1109 .mode = 0644,
1110 .proc_handler = proc_dointvec_minmax,
1111 .extra1 = &zero,
1112 .extra2 = &one,
1113 },
1114 {
1115 .procname = "hung_task_check_count",
1116 .data = &sysctl_hung_task_check_count,
1117 .maxlen = sizeof(int),
1118 .mode = 0644,
1119 .proc_handler = proc_dointvec_minmax,
1120 .extra1 = &zero,
1121 },
1122 {
1123 .procname = "hung_task_timeout_secs",
1124 .data = &sysctl_hung_task_timeout_secs,
1125 .maxlen = sizeof(unsigned long),
1126 .mode = 0644,
1127 .proc_handler = proc_dohung_task_timeout_secs,
1128 .extra2 = &hung_task_timeout_max,
1129 },
1130 {
1131 .procname = "hung_task_warnings",
1132 .data = &sysctl_hung_task_warnings,
1133 .maxlen = sizeof(int),
1134 .mode = 0644,
1135 .proc_handler = proc_dointvec_minmax,
1136 .extra1 = &neg_one,
1137 },
1138 #endif
1139 #ifdef CONFIG_COMPAT
1140 {
1141 .procname = "compat-log",
1142 .data = &compat_log,
1143 .maxlen = sizeof (int),
1144 .mode = 0644,
1145 .proc_handler = proc_dointvec,
1146 },
1147 #endif
1148 #ifdef CONFIG_RT_MUTEXES
1149 {
1150 .procname = "max_lock_depth",
1151 .data = &max_lock_depth,
1152 .maxlen = sizeof(int),
1153 .mode = 0644,
1154 .proc_handler = proc_dointvec,
1155 },
1156 #endif
1157 {
1158 .procname = "poweroff_cmd",
1159 .data = &poweroff_cmd,
1160 .maxlen = POWEROFF_CMD_PATH_LEN,
1161 .mode = 0644,
1162 .proc_handler = proc_dostring,
1163 },
1164 #ifdef CONFIG_KEYS
1165 {
1166 .procname = "keys",
1167 .mode = 0555,
1168 .child = key_sysctls,
1169 },
1170 #endif
1171 #ifdef CONFIG_PERF_EVENTS
1172 /*
1173 * User-space scripts rely on the existence of this file
1174 * as a feature check for perf_events being enabled.
1175 *
1176 * So it's an ABI, do not remove!
1177 */
1178 {
1179 .procname = "perf_event_paranoid",
1180 .data = &sysctl_perf_event_paranoid,
1181 .maxlen = sizeof(sysctl_perf_event_paranoid),
1182 .mode = 0644,
1183 .proc_handler = proc_dointvec,
1184 },
1185 {
1186 .procname = "perf_event_mlock_kb",
1187 .data = &sysctl_perf_event_mlock,
1188 .maxlen = sizeof(sysctl_perf_event_mlock),
1189 .mode = 0644,
1190 .proc_handler = proc_dointvec,
1191 },
1192 {
1193 .procname = "perf_event_max_sample_rate",
1194 .data = &sysctl_perf_event_sample_rate,
1195 .maxlen = sizeof(sysctl_perf_event_sample_rate),
1196 .mode = 0644,
1197 .proc_handler = perf_proc_update_handler,
1198 .extra1 = &one,
1199 },
1200 {
1201 .procname = "perf_cpu_time_max_percent",
1202 .data = &sysctl_perf_cpu_time_max_percent,
1203 .maxlen = sizeof(sysctl_perf_cpu_time_max_percent),
1204 .mode = 0644,
1205 .proc_handler = perf_cpu_time_max_percent_handler,
1206 .extra1 = &zero,
1207 .extra2 = &one_hundred,
1208 },
1209 #endif
1210 #ifdef CONFIG_KMEMCHECK
1211 {
1212 .procname = "kmemcheck",
1213 .data = &kmemcheck_enabled,
1214 .maxlen = sizeof(int),
1215 .mode = 0644,
1216 .proc_handler = proc_dointvec,
1217 },
1218 #endif
1219 {
1220 .procname = "panic_on_warn",
1221 .data = &panic_on_warn,
1222 .maxlen = sizeof(int),
1223 .mode = 0644,
1224 .proc_handler = proc_dointvec_minmax,
1225 .extra1 = &zero,
1226 .extra2 = &one,
1227 },
1228 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
1229 {
1230 .procname = "timer_migration",
1231 .data = &sysctl_timer_migration,
1232 .maxlen = sizeof(unsigned int),
1233 .mode = 0644,
1234 .proc_handler = timer_migration_handler,
1235 .extra1 = &zero,
1236 .extra2 = &one,
1237 },
1238 #endif
1239 #ifdef CONFIG_BPF_SYSCALL
1240 {
1241 .procname = "unprivileged_bpf_disabled",
1242 .data = &sysctl_unprivileged_bpf_disabled,
1243 .maxlen = sizeof(sysctl_unprivileged_bpf_disabled),
1244 .mode = 0644,
1245 /* only handle a transition from default "0" to "1" */
1246 .proc_handler = proc_dointvec_minmax,
1247 .extra1 = &one,
1248 .extra2 = &one,
1249 },
1250 #endif
1251 { }
1252 };
1253
1254 static struct ctl_table vm_table[] = {
1255 {
1256 .procname = "overcommit_memory",
1257 .data = &sysctl_overcommit_memory,
1258 .maxlen = sizeof(sysctl_overcommit_memory),
1259 .mode = 0644,
1260 .proc_handler = proc_dointvec_minmax,
1261 .extra1 = &zero,
1262 .extra2 = &two,
1263 },
1264 {
1265 .procname = "panic_on_oom",
1266 .data = &sysctl_panic_on_oom,
1267 .maxlen = sizeof(sysctl_panic_on_oom),
1268 .mode = 0644,
1269 .proc_handler = proc_dointvec_minmax,
1270 .extra1 = &zero,
1271 .extra2 = &two,
1272 },
1273 {
1274 .procname = "oom_kill_allocating_task",
1275 .data = &sysctl_oom_kill_allocating_task,
1276 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1277 .mode = 0644,
1278 .proc_handler = proc_dointvec,
1279 },
1280 {
1281 .procname = "oom_dump_tasks",
1282 .data = &sysctl_oom_dump_tasks,
1283 .maxlen = sizeof(sysctl_oom_dump_tasks),
1284 .mode = 0644,
1285 .proc_handler = proc_dointvec,
1286 },
1287 {
1288 .procname = "overcommit_ratio",
1289 .data = &sysctl_overcommit_ratio,
1290 .maxlen = sizeof(sysctl_overcommit_ratio),
1291 .mode = 0644,
1292 .proc_handler = overcommit_ratio_handler,
1293 },
1294 {
1295 .procname = "overcommit_kbytes",
1296 .data = &sysctl_overcommit_kbytes,
1297 .maxlen = sizeof(sysctl_overcommit_kbytes),
1298 .mode = 0644,
1299 .proc_handler = overcommit_kbytes_handler,
1300 },
1301 {
1302 .procname = "page-cluster",
1303 .data = &page_cluster,
1304 .maxlen = sizeof(int),
1305 .mode = 0644,
1306 .proc_handler = proc_dointvec_minmax,
1307 .extra1 = &zero,
1308 },
1309 {
1310 .procname = "dirty_background_ratio",
1311 .data = &dirty_background_ratio,
1312 .maxlen = sizeof(dirty_background_ratio),
1313 .mode = 0644,
1314 .proc_handler = dirty_background_ratio_handler,
1315 .extra1 = &zero,
1316 .extra2 = &one_hundred,
1317 },
1318 {
1319 .procname = "dirty_background_bytes",
1320 .data = &dirty_background_bytes,
1321 .maxlen = sizeof(dirty_background_bytes),
1322 .mode = 0644,
1323 .proc_handler = dirty_background_bytes_handler,
1324 .extra1 = &one_ul,
1325 },
1326 {
1327 .procname = "dirty_ratio",
1328 .data = &vm_dirty_ratio,
1329 .maxlen = sizeof(vm_dirty_ratio),
1330 .mode = 0644,
1331 .proc_handler = dirty_ratio_handler,
1332 .extra1 = &zero,
1333 .extra2 = &one_hundred,
1334 },
1335 {
1336 .procname = "dirty_bytes",
1337 .data = &vm_dirty_bytes,
1338 .maxlen = sizeof(vm_dirty_bytes),
1339 .mode = 0644,
1340 .proc_handler = dirty_bytes_handler,
1341 .extra1 = &dirty_bytes_min,
1342 },
1343 {
1344 .procname = "dirty_writeback_centisecs",
1345 .data = &dirty_writeback_interval,
1346 .maxlen = sizeof(dirty_writeback_interval),
1347 .mode = 0644,
1348 .proc_handler = dirty_writeback_centisecs_handler,
1349 },
1350 {
1351 .procname = "dirty_expire_centisecs",
1352 .data = &dirty_expire_interval,
1353 .maxlen = sizeof(dirty_expire_interval),
1354 .mode = 0644,
1355 .proc_handler = proc_dointvec_minmax,
1356 .extra1 = &zero,
1357 },
1358 {
1359 .procname = "dirtytime_expire_seconds",
1360 .data = &dirtytime_expire_interval,
1361 .maxlen = sizeof(dirty_expire_interval),
1362 .mode = 0644,
1363 .proc_handler = dirtytime_interval_handler,
1364 .extra1 = &zero,
1365 },
1366 {
1367 .procname = "nr_pdflush_threads",
1368 .mode = 0444 /* read-only */,
1369 .proc_handler = pdflush_proc_obsolete,
1370 },
1371 {
1372 .procname = "swappiness",
1373 .data = &vm_swappiness,
1374 .maxlen = sizeof(vm_swappiness),
1375 .mode = 0644,
1376 .proc_handler = proc_dointvec_minmax,
1377 .extra1 = &zero,
1378 #ifdef CONFIG_INCREASE_MAXIMUM_SWAPPINESS
1379 .extra2 = &max_swappiness,
1380 #else
1381 .extra2 = &one_hundred,
1382 #endif
1383 },
1384 #ifdef CONFIG_HUGETLB_PAGE
1385 {
1386 .procname = "nr_hugepages",
1387 .data = NULL,
1388 .maxlen = sizeof(unsigned long),
1389 .mode = 0644,
1390 .proc_handler = hugetlb_sysctl_handler,
1391 },
1392 #ifdef CONFIG_NUMA
1393 {
1394 .procname = "nr_hugepages_mempolicy",
1395 .data = NULL,
1396 .maxlen = sizeof(unsigned long),
1397 .mode = 0644,
1398 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
1399 },
1400 #endif
1401 {
1402 .procname = "hugetlb_shm_group",
1403 .data = &sysctl_hugetlb_shm_group,
1404 .maxlen = sizeof(gid_t),
1405 .mode = 0644,
1406 .proc_handler = proc_dointvec,
1407 },
1408 {
1409 .procname = "hugepages_treat_as_movable",
1410 .data = &hugepages_treat_as_movable,
1411 .maxlen = sizeof(int),
1412 .mode = 0644,
1413 .proc_handler = proc_dointvec,
1414 },
1415 {
1416 .procname = "nr_overcommit_hugepages",
1417 .data = NULL,
1418 .maxlen = sizeof(unsigned long),
1419 .mode = 0644,
1420 .proc_handler = hugetlb_overcommit_handler,
1421 },
1422 #endif
1423 {
1424 .procname = "lowmem_reserve_ratio",
1425 .data = &sysctl_lowmem_reserve_ratio,
1426 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1427 .mode = 0644,
1428 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
1429 },
1430 {
1431 .procname = "drop_caches",
1432 .data = &sysctl_drop_caches,
1433 .maxlen = sizeof(int),
1434 .mode = 0644,
1435 .proc_handler = drop_caches_sysctl_handler,
1436 .extra1 = &one,
1437 .extra2 = &four,
1438 },
1439 #ifdef CONFIG_COMPACTION
1440 {
1441 .procname = "compact_memory",
1442 .data = &sysctl_compact_memory,
1443 .maxlen = sizeof(int),
1444 .mode = 0200,
1445 .proc_handler = sysctl_compaction_handler,
1446 },
1447 {
1448 .procname = "extfrag_threshold",
1449 .data = &sysctl_extfrag_threshold,
1450 .maxlen = sizeof(int),
1451 .mode = 0644,
1452 .proc_handler = sysctl_extfrag_handler,
1453 .extra1 = &min_extfrag_threshold,
1454 .extra2 = &max_extfrag_threshold,
1455 },
1456 {
1457 .procname = "compact_unevictable_allowed",
1458 .data = &sysctl_compact_unevictable_allowed,
1459 .maxlen = sizeof(int),
1460 .mode = 0644,
1461 .proc_handler = proc_dointvec,
1462 .extra1 = &zero,
1463 .extra2 = &one,
1464 },
1465
1466 #endif /* CONFIG_COMPACTION */
1467 {
1468 .procname = "min_free_kbytes",
1469 .data = &min_free_kbytes,
1470 .maxlen = sizeof(min_free_kbytes),
1471 .mode = 0644,
1472 .proc_handler = min_free_kbytes_sysctl_handler,
1473 .extra1 = &zero,
1474 },
1475 {
1476 .procname = "extra_free_kbytes",
1477 .data = &extra_free_kbytes,
1478 .maxlen = sizeof(extra_free_kbytes),
1479 .mode = 0644,
1480 .proc_handler = min_free_kbytes_sysctl_handler,
1481 .extra1 = &zero,
1482 },
1483 {
1484 .procname = "percpu_pagelist_fraction",
1485 .data = &percpu_pagelist_fraction,
1486 .maxlen = sizeof(percpu_pagelist_fraction),
1487 .mode = 0644,
1488 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
1489 .extra1 = &zero,
1490 },
1491 #ifdef CONFIG_MMU
1492 {
1493 .procname = "max_map_count",
1494 .data = &sysctl_max_map_count,
1495 .maxlen = sizeof(sysctl_max_map_count),
1496 .mode = 0644,
1497 .proc_handler = proc_dointvec_minmax,
1498 .extra1 = &zero,
1499 },
1500 #else
1501 {
1502 .procname = "nr_trim_pages",
1503 .data = &sysctl_nr_trim_pages,
1504 .maxlen = sizeof(sysctl_nr_trim_pages),
1505 .mode = 0644,
1506 .proc_handler = proc_dointvec_minmax,
1507 .extra1 = &zero,
1508 },
1509 #endif
1510 {
1511 .procname = "laptop_mode",
1512 .data = &laptop_mode,
1513 .maxlen = sizeof(laptop_mode),
1514 .mode = 0644,
1515 .proc_handler = proc_dointvec_jiffies,
1516 },
1517 {
1518 .procname = "block_dump",
1519 .data = &block_dump,
1520 .maxlen = sizeof(block_dump),
1521 .mode = 0644,
1522 .proc_handler = proc_dointvec,
1523 .extra1 = &zero,
1524 },
1525 {
1526 .procname = "vfs_cache_pressure",
1527 .data = &sysctl_vfs_cache_pressure,
1528 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1529 .mode = 0644,
1530 .proc_handler = proc_dointvec,
1531 .extra1 = &zero,
1532 },
1533 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1534 {
1535 .procname = "legacy_va_layout",
1536 .data = &sysctl_legacy_va_layout,
1537 .maxlen = sizeof(sysctl_legacy_va_layout),
1538 .mode = 0644,
1539 .proc_handler = proc_dointvec,
1540 .extra1 = &zero,
1541 },
1542 #endif
1543 #ifdef CONFIG_NUMA
1544 {
1545 .procname = "zone_reclaim_mode",
1546 .data = &zone_reclaim_mode,
1547 .maxlen = sizeof(zone_reclaim_mode),
1548 .mode = 0644,
1549 .proc_handler = proc_dointvec,
1550 .extra1 = &zero,
1551 },
1552 {
1553 .procname = "min_unmapped_ratio",
1554 .data = &sysctl_min_unmapped_ratio,
1555 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1556 .mode = 0644,
1557 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
1558 .extra1 = &zero,
1559 .extra2 = &one_hundred,
1560 },
1561 {
1562 .procname = "min_slab_ratio",
1563 .data = &sysctl_min_slab_ratio,
1564 .maxlen = sizeof(sysctl_min_slab_ratio),
1565 .mode = 0644,
1566 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
1567 .extra1 = &zero,
1568 .extra2 = &one_hundred,
1569 },
1570 #endif
1571 #ifdef CONFIG_SMP
1572 {
1573 .procname = "stat_interval",
1574 .data = &sysctl_stat_interval,
1575 .maxlen = sizeof(sysctl_stat_interval),
1576 .mode = 0644,
1577 .proc_handler = proc_dointvec_jiffies,
1578 },
1579 #endif
1580 #ifdef CONFIG_MMU
1581 {
1582 .procname = "mmap_min_addr",
1583 .data = &dac_mmap_min_addr,
1584 .maxlen = sizeof(unsigned long),
1585 .mode = 0644,
1586 .proc_handler = mmap_min_addr_handler,
1587 },
1588 #endif
1589 #ifdef CONFIG_NUMA
1590 {
1591 .procname = "numa_zonelist_order",
1592 .data = &numa_zonelist_order,
1593 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1594 .mode = 0644,
1595 .proc_handler = numa_zonelist_order_handler,
1596 },
1597 #endif
1598 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1599 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1600 {
1601 .procname = "vdso_enabled",
1602 #ifdef CONFIG_X86_32
1603 .data = &vdso32_enabled,
1604 .maxlen = sizeof(vdso32_enabled),
1605 #else
1606 .data = &vdso_enabled,
1607 .maxlen = sizeof(vdso_enabled),
1608 #endif
1609 .mode = 0644,
1610 .proc_handler = proc_dointvec,
1611 .extra1 = &zero,
1612 },
1613 #endif
1614 #ifdef CONFIG_HIGHMEM
1615 {
1616 .procname = "highmem_is_dirtyable",
1617 .data = &vm_highmem_is_dirtyable,
1618 .maxlen = sizeof(vm_highmem_is_dirtyable),
1619 .mode = 0644,
1620 .proc_handler = proc_dointvec_minmax,
1621 .extra1 = &zero,
1622 .extra2 = &one,
1623 },
1624 #endif
1625 #ifdef CONFIG_MEMORY_FAILURE
1626 {
1627 .procname = "memory_failure_early_kill",
1628 .data = &sysctl_memory_failure_early_kill,
1629 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1630 .mode = 0644,
1631 .proc_handler = proc_dointvec_minmax,
1632 .extra1 = &zero,
1633 .extra2 = &one,
1634 },
1635 {
1636 .procname = "memory_failure_recovery",
1637 .data = &sysctl_memory_failure_recovery,
1638 .maxlen = sizeof(sysctl_memory_failure_recovery),
1639 .mode = 0644,
1640 .proc_handler = proc_dointvec_minmax,
1641 .extra1 = &zero,
1642 .extra2 = &one,
1643 },
1644 #endif
1645 {
1646 .procname = "user_reserve_kbytes",
1647 .data = &sysctl_user_reserve_kbytes,
1648 .maxlen = sizeof(sysctl_user_reserve_kbytes),
1649 .mode = 0644,
1650 .proc_handler = proc_doulongvec_minmax,
1651 },
1652 {
1653 .procname = "admin_reserve_kbytes",
1654 .data = &sysctl_admin_reserve_kbytes,
1655 .maxlen = sizeof(sysctl_admin_reserve_kbytes),
1656 .mode = 0644,
1657 .proc_handler = proc_doulongvec_minmax,
1658 },
1659 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS
1660 {
1661 .procname = "mmap_rnd_bits",
1662 .data = &mmap_rnd_bits,
1663 .maxlen = sizeof(mmap_rnd_bits),
1664 .mode = 0600,
1665 .proc_handler = proc_dointvec_minmax,
1666 .extra1 = (void *)&mmap_rnd_bits_min,
1667 .extra2 = (void *)&mmap_rnd_bits_max,
1668 },
1669 #endif
1670 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS
1671 {
1672 .procname = "mmap_rnd_compat_bits",
1673 .data = &mmap_rnd_compat_bits,
1674 .maxlen = sizeof(mmap_rnd_compat_bits),
1675 .mode = 0600,
1676 .proc_handler = proc_dointvec_minmax,
1677 .extra1 = (void *)&mmap_rnd_compat_bits_min,
1678 .extra2 = (void *)&mmap_rnd_compat_bits_max,
1679 },
1680 #endif
1681 { }
1682 };
1683
1684 static struct ctl_table fs_table[] = {
1685 {
1686 .procname = "inode-nr",
1687 .data = &inodes_stat,
1688 .maxlen = 2*sizeof(long),
1689 .mode = 0444,
1690 .proc_handler = proc_nr_inodes,
1691 },
1692 {
1693 .procname = "inode-state",
1694 .data = &inodes_stat,
1695 .maxlen = 7*sizeof(long),
1696 .mode = 0444,
1697 .proc_handler = proc_nr_inodes,
1698 },
1699 {
1700 .procname = "file-nr",
1701 .data = &files_stat,
1702 .maxlen = sizeof(files_stat),
1703 .mode = 0444,
1704 .proc_handler = proc_nr_files,
1705 },
1706 {
1707 .procname = "file-max",
1708 .data = &files_stat.max_files,
1709 .maxlen = sizeof(files_stat.max_files),
1710 .mode = 0644,
1711 .proc_handler = proc_doulongvec_minmax,
1712 },
1713 {
1714 .procname = "nr_open",
1715 .data = &sysctl_nr_open,
1716 .maxlen = sizeof(int),
1717 .mode = 0644,
1718 .proc_handler = proc_dointvec_minmax,
1719 .extra1 = &sysctl_nr_open_min,
1720 .extra2 = &sysctl_nr_open_max,
1721 },
1722 {
1723 .procname = "dentry-state",
1724 .data = &dentry_stat,
1725 .maxlen = 6*sizeof(long),
1726 .mode = 0444,
1727 .proc_handler = proc_nr_dentry,
1728 },
1729 {
1730 .procname = "overflowuid",
1731 .data = &fs_overflowuid,
1732 .maxlen = sizeof(int),
1733 .mode = 0644,
1734 .proc_handler = proc_dointvec_minmax,
1735 .extra1 = &minolduid,
1736 .extra2 = &maxolduid,
1737 },
1738 {
1739 .procname = "overflowgid",
1740 .data = &fs_overflowgid,
1741 .maxlen = sizeof(int),
1742 .mode = 0644,
1743 .proc_handler = proc_dointvec_minmax,
1744 .extra1 = &minolduid,
1745 .extra2 = &maxolduid,
1746 },
1747 #ifdef CONFIG_FILE_LOCKING
1748 {
1749 .procname = "leases-enable",
1750 .data = &leases_enable,
1751 .maxlen = sizeof(int),
1752 .mode = 0644,
1753 .proc_handler = proc_dointvec,
1754 },
1755 #endif
1756 #ifdef CONFIG_DNOTIFY
1757 {
1758 .procname = "dir-notify-enable",
1759 .data = &dir_notify_enable,
1760 .maxlen = sizeof(int),
1761 .mode = 0644,
1762 .proc_handler = proc_dointvec,
1763 },
1764 #endif
1765 #ifdef CONFIG_MMU
1766 #ifdef CONFIG_FILE_LOCKING
1767 {
1768 .procname = "lease-break-time",
1769 .data = &lease_break_time,
1770 .maxlen = sizeof(int),
1771 .mode = 0644,
1772 .proc_handler = proc_dointvec,
1773 },
1774 #endif
1775 #ifdef CONFIG_AIO
1776 {
1777 .procname = "aio-nr",
1778 .data = &aio_nr,
1779 .maxlen = sizeof(aio_nr),
1780 .mode = 0444,
1781 .proc_handler = proc_doulongvec_minmax,
1782 },
1783 {
1784 .procname = "aio-max-nr",
1785 .data = &aio_max_nr,
1786 .maxlen = sizeof(aio_max_nr),
1787 .mode = 0644,
1788 .proc_handler = proc_doulongvec_minmax,
1789 },
1790 #endif /* CONFIG_AIO */
1791 #ifdef CONFIG_INOTIFY_USER
1792 {
1793 .procname = "inotify",
1794 .mode = 0555,
1795 .child = inotify_table,
1796 },
1797 #endif
1798 #ifdef CONFIG_EPOLL
1799 {
1800 .procname = "epoll",
1801 .mode = 0555,
1802 .child = epoll_table,
1803 },
1804 #endif
1805 #endif
1806 {
1807 .procname = "protected_symlinks",
1808 .data = &sysctl_protected_symlinks,
1809 .maxlen = sizeof(int),
1810 .mode = 0600,
1811 .proc_handler = proc_dointvec_minmax,
1812 .extra1 = &zero,
1813 .extra2 = &one,
1814 },
1815 {
1816 .procname = "protected_hardlinks",
1817 .data = &sysctl_protected_hardlinks,
1818 .maxlen = sizeof(int),
1819 .mode = 0600,
1820 .proc_handler = proc_dointvec_minmax,
1821 .extra1 = &zero,
1822 .extra2 = &one,
1823 },
1824 {
1825 .procname = "suid_dumpable",
1826 .data = &suid_dumpable,
1827 .maxlen = sizeof(int),
1828 .mode = 0644,
1829 .proc_handler = proc_dointvec_minmax_coredump,
1830 .extra1 = &zero,
1831 .extra2 = &two,
1832 },
1833 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1834 {
1835 .procname = "binfmt_misc",
1836 .mode = 0555,
1837 .child = sysctl_mount_point,
1838 },
1839 #endif
1840 {
1841 .procname = "pipe-max-size",
1842 .data = &pipe_max_size,
1843 .maxlen = sizeof(int),
1844 .mode = 0644,
1845 .proc_handler = &pipe_proc_fn,
1846 .extra1 = &pipe_min_size,
1847 },
1848 {
1849 .procname = "pipe-user-pages-hard",
1850 .data = &pipe_user_pages_hard,
1851 .maxlen = sizeof(pipe_user_pages_hard),
1852 .mode = 0644,
1853 .proc_handler = proc_doulongvec_minmax,
1854 },
1855 {
1856 .procname = "pipe-user-pages-soft",
1857 .data = &pipe_user_pages_soft,
1858 .maxlen = sizeof(pipe_user_pages_soft),
1859 .mode = 0644,
1860 .proc_handler = proc_doulongvec_minmax,
1861 },
1862 {
1863 .procname = "mount-max",
1864 .data = &sysctl_mount_max,
1865 .maxlen = sizeof(unsigned int),
1866 .mode = 0644,
1867 .proc_handler = proc_dointvec_minmax,
1868 .extra1 = &one,
1869 },
1870 { }
1871 };
1872
1873 static struct ctl_table debug_table[] = {
1874 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1875 {
1876 .procname = "exception-trace",
1877 .data = &show_unhandled_signals,
1878 .maxlen = sizeof(int),
1879 .mode = 0644,
1880 .proc_handler = proc_dointvec
1881 },
1882 #endif
1883 #if defined(CONFIG_OPTPROBES)
1884 {
1885 .procname = "kprobes-optimization",
1886 .data = &sysctl_kprobes_optimization,
1887 .maxlen = sizeof(int),
1888 .mode = 0644,
1889 .proc_handler = proc_kprobes_optimization_handler,
1890 .extra1 = &zero,
1891 .extra2 = &one,
1892 },
1893 #endif
1894 { }
1895 };
1896
1897 static struct ctl_table dev_table[] = {
1898 { }
1899 };
1900
1901 int __init sysctl_init(void)
1902 {
1903 struct ctl_table_header *hdr;
1904
1905 hdr = register_sysctl_table(sysctl_base_table);
1906 kmemleak_not_leak(hdr);
1907 return 0;
1908 }
1909
1910 #endif /* CONFIG_SYSCTL */
1911
1912 /*
1913 * /proc/sys support
1914 */
1915
1916 #ifdef CONFIG_PROC_SYSCTL
1917
1918 static int _proc_do_string(char *data, int maxlen, int write,
1919 char __user *buffer,
1920 size_t *lenp, loff_t *ppos)
1921 {
1922 size_t len;
1923 char __user *p;
1924 char c;
1925
1926 if (!data || !maxlen || !*lenp) {
1927 *lenp = 0;
1928 return 0;
1929 }
1930
1931 if (write) {
1932 if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) {
1933 /* Only continue writes not past the end of buffer. */
1934 len = strlen(data);
1935 if (len > maxlen - 1)
1936 len = maxlen - 1;
1937
1938 if (*ppos > len)
1939 return 0;
1940 len = *ppos;
1941 } else {
1942 /* Start writing from beginning of buffer. */
1943 len = 0;
1944 }
1945
1946 *ppos += *lenp;
1947 p = buffer;
1948 while ((p - buffer) < *lenp && len < maxlen - 1) {
1949 if (get_user(c, p++))
1950 return -EFAULT;
1951 if (c == 0 || c == '\n')
1952 break;
1953 data[len++] = c;
1954 }
1955 data[len] = 0;
1956 } else {
1957 len = strlen(data);
1958 if (len > maxlen)
1959 len = maxlen;
1960
1961 if (*ppos > len) {
1962 *lenp = 0;
1963 return 0;
1964 }
1965
1966 data += *ppos;
1967 len -= *ppos;
1968
1969 if (len > *lenp)
1970 len = *lenp;
1971 if (len)
1972 if (copy_to_user(buffer, data, len))
1973 return -EFAULT;
1974 if (len < *lenp) {
1975 if (put_user('\n', buffer + len))
1976 return -EFAULT;
1977 len++;
1978 }
1979 *lenp = len;
1980 *ppos += len;
1981 }
1982 return 0;
1983 }
1984
1985 static void warn_sysctl_write(struct ctl_table *table)
1986 {
1987 pr_warn_once("%s wrote to %s when file position was not 0!\n"
1988 "This will not be supported in the future. To silence this\n"
1989 "warning, set kernel.sysctl_writes_strict = -1\n",
1990 current->comm, table->procname);
1991 }
1992
1993 /**
1994 * proc_dostring - read a string sysctl
1995 * @table: the sysctl table
1996 * @write: %TRUE if this is a write to the sysctl file
1997 * @buffer: the user buffer
1998 * @lenp: the size of the user buffer
1999 * @ppos: file position
2000 *
2001 * Reads/writes a string from/to the user buffer. If the kernel
2002 * buffer provided is not large enough to hold the string, the
2003 * string is truncated. The copied string is %NULL-terminated.
2004 * If the string is being read by the user process, it is copied
2005 * and a newline '\n' is added. It is truncated if the buffer is
2006 * not large enough.
2007 *
2008 * Returns 0 on success.
2009 */
2010 int proc_dostring(struct ctl_table *table, int write,
2011 void __user *buffer, size_t *lenp, loff_t *ppos)
2012 {
2013 if (write && *ppos && sysctl_writes_strict == SYSCTL_WRITES_WARN)
2014 warn_sysctl_write(table);
2015
2016 return _proc_do_string((char *)(table->data), table->maxlen, write,
2017 (char __user *)buffer, lenp, ppos);
2018 }
2019
2020 static size_t proc_skip_spaces(char **buf)
2021 {
2022 size_t ret;
2023 char *tmp = skip_spaces(*buf);
2024 ret = tmp - *buf;
2025 *buf = tmp;
2026 return ret;
2027 }
2028
2029 static void proc_skip_char(char **buf, size_t *size, const char v)
2030 {
2031 while (*size) {
2032 if (**buf != v)
2033 break;
2034 (*size)--;
2035 (*buf)++;
2036 }
2037 }
2038
2039 #define TMPBUFLEN 22
2040 /**
2041 * proc_get_long - reads an ASCII formatted integer from a user buffer
2042 *
2043 * @buf: a kernel buffer
2044 * @size: size of the kernel buffer
2045 * @val: this is where the number will be stored
2046 * @neg: set to %TRUE if number is negative
2047 * @perm_tr: a vector which contains the allowed trailers
2048 * @perm_tr_len: size of the perm_tr vector
2049 * @tr: pointer to store the trailer character
2050 *
2051 * In case of success %0 is returned and @buf and @size are updated with
2052 * the amount of bytes read. If @tr is non-NULL and a trailing
2053 * character exists (size is non-zero after returning from this
2054 * function), @tr is updated with the trailing character.
2055 */
2056 static int proc_get_long(char **buf, size_t *size,
2057 unsigned long *val, bool *neg,
2058 const char *perm_tr, unsigned perm_tr_len, char *tr)
2059 {
2060 int len;
2061 char *p, tmp[TMPBUFLEN];
2062
2063 if (!*size)
2064 return -EINVAL;
2065
2066 len = *size;
2067 if (len > TMPBUFLEN - 1)
2068 len = TMPBUFLEN - 1;
2069
2070 memcpy(tmp, *buf, len);
2071
2072 tmp[len] = 0;
2073 p = tmp;
2074 if (*p == '-' && *size > 1) {
2075 *neg = true;
2076 p++;
2077 } else
2078 *neg = false;
2079 if (!isdigit(*p))
2080 return -EINVAL;
2081
2082 *val = simple_strtoul(p, &p, 0);
2083
2084 len = p - tmp;
2085
2086 /* We don't know if the next char is whitespace thus we may accept
2087 * invalid integers (e.g. 1234...a) or two integers instead of one
2088 * (e.g. 123...1). So lets not allow such large numbers. */
2089 if (len == TMPBUFLEN - 1)
2090 return -EINVAL;
2091
2092 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
2093 return -EINVAL;
2094
2095 if (tr && (len < *size))
2096 *tr = *p;
2097
2098 *buf += len;
2099 *size -= len;
2100
2101 return 0;
2102 }
2103
2104 /**
2105 * proc_put_long - converts an integer to a decimal ASCII formatted string
2106 *
2107 * @buf: the user buffer
2108 * @size: the size of the user buffer
2109 * @val: the integer to be converted
2110 * @neg: sign of the number, %TRUE for negative
2111 *
2112 * In case of success %0 is returned and @buf and @size are updated with
2113 * the amount of bytes written.
2114 */
2115 static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
2116 bool neg)
2117 {
2118 int len;
2119 char tmp[TMPBUFLEN], *p = tmp;
2120
2121 sprintf(p, "%s%lu", neg ? "-" : "", val);
2122 len = strlen(tmp);
2123 if (len > *size)
2124 len = *size;
2125 if (copy_to_user(*buf, tmp, len))
2126 return -EFAULT;
2127 *size -= len;
2128 *buf += len;
2129 return 0;
2130 }
2131 #undef TMPBUFLEN
2132
2133 static int proc_put_char(void __user **buf, size_t *size, char c)
2134 {
2135 if (*size) {
2136 char __user **buffer = (char __user **)buf;
2137 if (put_user(c, *buffer))
2138 return -EFAULT;
2139 (*size)--, (*buffer)++;
2140 *buf = *buffer;
2141 }
2142 return 0;
2143 }
2144
2145 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
2146 int *valp,
2147 int write, void *data)
2148 {
2149 if (write) {
2150 if (*negp) {
2151 if (*lvalp > (unsigned long) INT_MAX + 1)
2152 return -EINVAL;
2153 *valp = -*lvalp;
2154 } else {
2155 if (*lvalp > (unsigned long) INT_MAX)
2156 return -EINVAL;
2157 *valp = *lvalp;
2158 }
2159 } else {
2160 int val = *valp;
2161 if (val < 0) {
2162 *negp = true;
2163 *lvalp = -(unsigned long)val;
2164 } else {
2165 *negp = false;
2166 *lvalp = (unsigned long)val;
2167 }
2168 }
2169 return 0;
2170 }
2171
2172 static int do_proc_douintvec_conv(bool *negp, unsigned long *lvalp,
2173 int *valp,
2174 int write, void *data)
2175 {
2176 if (write) {
2177 if (*negp)
2178 return -EINVAL;
2179 if (*lvalp > UINT_MAX)
2180 return -EINVAL;
2181 *valp = *lvalp;
2182 } else {
2183 unsigned int val = *valp;
2184 *negp = false;
2185 *lvalp = (unsigned long)val;
2186 }
2187 return 0;
2188 }
2189
2190 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
2191
2192 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
2193 int write, void __user *buffer,
2194 size_t *lenp, loff_t *ppos,
2195 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2196 int write, void *data),
2197 void *data)
2198 {
2199 int *i, vleft, first = 1, err = 0;
2200 unsigned long page = 0;
2201 size_t left;
2202 char *kbuf;
2203
2204 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
2205 *lenp = 0;
2206 return 0;
2207 }
2208
2209 i = (int *) tbl_data;
2210 vleft = table->maxlen / sizeof(*i);
2211 left = *lenp;
2212
2213 if (!conv)
2214 conv = do_proc_dointvec_conv;
2215
2216 if (write) {
2217 if (*ppos) {
2218 switch (sysctl_writes_strict) {
2219 case SYSCTL_WRITES_STRICT:
2220 goto out;
2221 case SYSCTL_WRITES_WARN:
2222 warn_sysctl_write(table);
2223 break;
2224 default:
2225 break;
2226 }
2227 }
2228
2229 if (left > PAGE_SIZE - 1)
2230 left = PAGE_SIZE - 1;
2231 page = __get_free_page(GFP_TEMPORARY);
2232 kbuf = (char *) page;
2233 if (!kbuf)
2234 return -ENOMEM;
2235 if (copy_from_user(kbuf, buffer, left)) {
2236 err = -EFAULT;
2237 goto free;
2238 }
2239 kbuf[left] = 0;
2240 }
2241
2242 for (; left && vleft--; i++, first=0) {
2243 unsigned long lval;
2244 bool neg;
2245
2246 if (write) {
2247 left -= proc_skip_spaces(&kbuf);
2248
2249 if (!left)
2250 break;
2251 err = proc_get_long(&kbuf, &left, &lval, &neg,
2252 proc_wspace_sep,
2253 sizeof(proc_wspace_sep), NULL);
2254 if (err)
2255 break;
2256 if (conv(&neg, &lval, i, 1, data)) {
2257 err = -EINVAL;
2258 break;
2259 }
2260 } else {
2261 if (conv(&neg, &lval, i, 0, data)) {
2262 err = -EINVAL;
2263 break;
2264 }
2265 if (!first)
2266 err = proc_put_char(&buffer, &left, '\t');
2267 if (err)
2268 break;
2269 err = proc_put_long(&buffer, &left, lval, neg);
2270 if (err)
2271 break;
2272 }
2273 }
2274
2275 if (!write && !first && left && !err)
2276 err = proc_put_char(&buffer, &left, '\n');
2277 if (write && !err && left)
2278 left -= proc_skip_spaces(&kbuf);
2279 free:
2280 if (write) {
2281 free_page(page);
2282 if (first)
2283 return err ? : -EINVAL;
2284 }
2285 *lenp -= left;
2286 out:
2287 *ppos += *lenp;
2288 return err;
2289 }
2290
2291 static int do_proc_dointvec(struct ctl_table *table, int write,
2292 void __user *buffer, size_t *lenp, loff_t *ppos,
2293 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2294 int write, void *data),
2295 void *data)
2296 {
2297 return __do_proc_dointvec(table->data, table, write,
2298 buffer, lenp, ppos, conv, data);
2299 }
2300
2301 /**
2302 * proc_dointvec - read a vector of integers
2303 * @table: the sysctl table
2304 * @write: %TRUE if this is a write to the sysctl file
2305 * @buffer: the user buffer
2306 * @lenp: the size of the user buffer
2307 * @ppos: file position
2308 *
2309 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2310 * values from/to the user buffer, treated as an ASCII string.
2311 *
2312 * Returns 0 on success.
2313 */
2314 int proc_dointvec(struct ctl_table *table, int write,
2315 void __user *buffer, size_t *lenp, loff_t *ppos)
2316 {
2317 return do_proc_dointvec(table, write, buffer, lenp, ppos, NULL, NULL);
2318 }
2319
2320 /**
2321 * proc_douintvec - read a vector of unsigned integers
2322 * @table: the sysctl table
2323 * @write: %TRUE if this is a write to the sysctl file
2324 * @buffer: the user buffer
2325 * @lenp: the size of the user buffer
2326 * @ppos: file position
2327 *
2328 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
2329 * values from/to the user buffer, treated as an ASCII string.
2330 *
2331 * Returns 0 on success.
2332 */
2333 int proc_douintvec(struct ctl_table *table, int write,
2334 void __user *buffer, size_t *lenp, loff_t *ppos)
2335 {
2336 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2337 do_proc_douintvec_conv, NULL);
2338 }
2339
2340 /*
2341 * Taint values can only be increased
2342 * This means we can safely use a temporary.
2343 */
2344 static int proc_taint(struct ctl_table *table, int write,
2345 void __user *buffer, size_t *lenp, loff_t *ppos)
2346 {
2347 struct ctl_table t;
2348 unsigned long tmptaint = get_taint();
2349 int err;
2350
2351 if (write && !capable(CAP_SYS_ADMIN))
2352 return -EPERM;
2353
2354 t = *table;
2355 t.data = &tmptaint;
2356 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2357 if (err < 0)
2358 return err;
2359
2360 if (write) {
2361 /*
2362 * Poor man's atomic or. Not worth adding a primitive
2363 * to everyone's atomic.h for this
2364 */
2365 int i;
2366 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2367 if ((tmptaint >> i) & 1)
2368 add_taint(i, LOCKDEP_STILL_OK);
2369 }
2370 }
2371
2372 return err;
2373 }
2374
2375 #ifdef CONFIG_PRINTK
2376 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
2377 void __user *buffer, size_t *lenp, loff_t *ppos)
2378 {
2379 if (write && !capable(CAP_SYS_ADMIN))
2380 return -EPERM;
2381
2382 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2383 }
2384 #endif
2385
2386 struct do_proc_dointvec_minmax_conv_param {
2387 int *min;
2388 int *max;
2389 };
2390
2391 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2392 int *valp,
2393 int write, void *data)
2394 {
2395 struct do_proc_dointvec_minmax_conv_param *param = data;
2396 if (write) {
2397 int val = *negp ? -*lvalp : *lvalp;
2398 if ((param->min && *param->min > val) ||
2399 (param->max && *param->max < val))
2400 return -EINVAL;
2401 *valp = val;
2402 } else {
2403 int val = *valp;
2404 if (val < 0) {
2405 *negp = true;
2406 *lvalp = -(unsigned long)val;
2407 } else {
2408 *negp = false;
2409 *lvalp = (unsigned long)val;
2410 }
2411 }
2412 return 0;
2413 }
2414
2415 /**
2416 * proc_dointvec_minmax - read a vector of integers with min/max values
2417 * @table: the sysctl table
2418 * @write: %TRUE if this is a write to the sysctl file
2419 * @buffer: the user buffer
2420 * @lenp: the size of the user buffer
2421 * @ppos: file position
2422 *
2423 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2424 * values from/to the user buffer, treated as an ASCII string.
2425 *
2426 * This routine will ensure the values are within the range specified by
2427 * table->extra1 (min) and table->extra2 (max).
2428 *
2429 * Returns 0 on success.
2430 */
2431 int proc_dointvec_minmax(struct ctl_table *table, int write,
2432 void __user *buffer, size_t *lenp, loff_t *ppos)
2433 {
2434 struct do_proc_dointvec_minmax_conv_param param = {
2435 .min = (int *) table->extra1,
2436 .max = (int *) table->extra2,
2437 };
2438 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2439 do_proc_dointvec_minmax_conv, &param);
2440 }
2441
2442 static void validate_coredump_safety(void)
2443 {
2444 #ifdef CONFIG_COREDUMP
2445 if (suid_dumpable == SUID_DUMP_ROOT &&
2446 core_pattern[0] != '/' && core_pattern[0] != '|') {
2447 printk(KERN_WARNING "Unsafe core_pattern used with "\
2448 "suid_dumpable=2. Pipe handler or fully qualified "\
2449 "core dump path required.\n");
2450 }
2451 #endif
2452 }
2453
2454 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2455 void __user *buffer, size_t *lenp, loff_t *ppos)
2456 {
2457 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2458 if (!error)
2459 validate_coredump_safety();
2460 return error;
2461 }
2462
2463 #ifdef CONFIG_COREDUMP
2464 static int proc_dostring_coredump(struct ctl_table *table, int write,
2465 void __user *buffer, size_t *lenp, loff_t *ppos)
2466 {
2467 int error = proc_dostring(table, write, buffer, lenp, ppos);
2468 if (!error)
2469 validate_coredump_safety();
2470 return error;
2471 }
2472 #endif
2473
2474 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2475 void __user *buffer,
2476 size_t *lenp, loff_t *ppos,
2477 unsigned long convmul,
2478 unsigned long convdiv)
2479 {
2480 unsigned long *i, *min, *max;
2481 int vleft, first = 1, err = 0;
2482 unsigned long page = 0;
2483 size_t left;
2484 char *kbuf;
2485
2486 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2487 *lenp = 0;
2488 return 0;
2489 }
2490
2491 i = (unsigned long *) data;
2492 min = (unsigned long *) table->extra1;
2493 max = (unsigned long *) table->extra2;
2494 vleft = table->maxlen / sizeof(unsigned long);
2495 left = *lenp;
2496
2497 if (write) {
2498 if (*ppos) {
2499 switch (sysctl_writes_strict) {
2500 case SYSCTL_WRITES_STRICT:
2501 goto out;
2502 case SYSCTL_WRITES_WARN:
2503 warn_sysctl_write(table);
2504 break;
2505 default:
2506 break;
2507 }
2508 }
2509
2510 if (left > PAGE_SIZE - 1)
2511 left = PAGE_SIZE - 1;
2512 page = __get_free_page(GFP_TEMPORARY);
2513 kbuf = (char *) page;
2514 if (!kbuf)
2515 return -ENOMEM;
2516 if (copy_from_user(kbuf, buffer, left)) {
2517 err = -EFAULT;
2518 goto free;
2519 }
2520 kbuf[left] = 0;
2521 }
2522
2523 for (; left && vleft--; i++, first = 0) {
2524 unsigned long val;
2525
2526 if (write) {
2527 bool neg;
2528
2529 left -= proc_skip_spaces(&kbuf);
2530
2531 err = proc_get_long(&kbuf, &left, &val, &neg,
2532 proc_wspace_sep,
2533 sizeof(proc_wspace_sep), NULL);
2534 if (err)
2535 break;
2536 if (neg)
2537 continue;
2538 val = convmul * val / convdiv;
2539 if ((min && val < *min) || (max && val > *max))
2540 continue;
2541 *i = val;
2542 } else {
2543 val = convdiv * (*i) / convmul;
2544 if (!first) {
2545 err = proc_put_char(&buffer, &left, '\t');
2546 if (err)
2547 break;
2548 }
2549 err = proc_put_long(&buffer, &left, val, false);
2550 if (err)
2551 break;
2552 }
2553 }
2554
2555 if (!write && !first && left && !err)
2556 err = proc_put_char(&buffer, &left, '\n');
2557 if (write && !err)
2558 left -= proc_skip_spaces(&kbuf);
2559 free:
2560 if (write) {
2561 free_page(page);
2562 if (first)
2563 return err ? : -EINVAL;
2564 }
2565 *lenp -= left;
2566 out:
2567 *ppos += *lenp;
2568 return err;
2569 }
2570
2571 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2572 void __user *buffer,
2573 size_t *lenp, loff_t *ppos,
2574 unsigned long convmul,
2575 unsigned long convdiv)
2576 {
2577 return __do_proc_doulongvec_minmax(table->data, table, write,
2578 buffer, lenp, ppos, convmul, convdiv);
2579 }
2580
2581 /**
2582 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2583 * @table: the sysctl table
2584 * @write: %TRUE if this is a write to the sysctl file
2585 * @buffer: the user buffer
2586 * @lenp: the size of the user buffer
2587 * @ppos: file position
2588 *
2589 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2590 * values from/to the user buffer, treated as an ASCII string.
2591 *
2592 * This routine will ensure the values are within the range specified by
2593 * table->extra1 (min) and table->extra2 (max).
2594 *
2595 * Returns 0 on success.
2596 */
2597 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2598 void __user *buffer, size_t *lenp, loff_t *ppos)
2599 {
2600 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2601 }
2602
2603 /**
2604 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2605 * @table: the sysctl table
2606 * @write: %TRUE if this is a write to the sysctl file
2607 * @buffer: the user buffer
2608 * @lenp: the size of the user buffer
2609 * @ppos: file position
2610 *
2611 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2612 * values from/to the user buffer, treated as an ASCII string. The values
2613 * are treated as milliseconds, and converted to jiffies when they are stored.
2614 *
2615 * This routine will ensure the values are within the range specified by
2616 * table->extra1 (min) and table->extra2 (max).
2617 *
2618 * Returns 0 on success.
2619 */
2620 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2621 void __user *buffer,
2622 size_t *lenp, loff_t *ppos)
2623 {
2624 return do_proc_doulongvec_minmax(table, write, buffer,
2625 lenp, ppos, HZ, 1000l);
2626 }
2627
2628
2629 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2630 int *valp,
2631 int write, void *data)
2632 {
2633 if (write) {
2634 if (*lvalp > LONG_MAX / HZ)
2635 return 1;
2636 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2637 } else {
2638 int val = *valp;
2639 unsigned long lval;
2640 if (val < 0) {
2641 *negp = true;
2642 lval = -(unsigned long)val;
2643 } else {
2644 *negp = false;
2645 lval = (unsigned long)val;
2646 }
2647 *lvalp = lval / HZ;
2648 }
2649 return 0;
2650 }
2651
2652 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2653 int *valp,
2654 int write, void *data)
2655 {
2656 if (write) {
2657 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2658 return 1;
2659 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2660 } else {
2661 int val = *valp;
2662 unsigned long lval;
2663 if (val < 0) {
2664 *negp = true;
2665 lval = -(unsigned long)val;
2666 } else {
2667 *negp = false;
2668 lval = (unsigned long)val;
2669 }
2670 *lvalp = jiffies_to_clock_t(lval);
2671 }
2672 return 0;
2673 }
2674
2675 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2676 int *valp,
2677 int write, void *data)
2678 {
2679 if (write) {
2680 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2681
2682 if (jif > INT_MAX)
2683 return 1;
2684 *valp = (int)jif;
2685 } else {
2686 int val = *valp;
2687 unsigned long lval;
2688 if (val < 0) {
2689 *negp = true;
2690 lval = -(unsigned long)val;
2691 } else {
2692 *negp = false;
2693 lval = (unsigned long)val;
2694 }
2695 *lvalp = jiffies_to_msecs(lval);
2696 }
2697 return 0;
2698 }
2699
2700 /**
2701 * proc_dointvec_jiffies - read a vector of integers as seconds
2702 * @table: the sysctl table
2703 * @write: %TRUE if this is a write to the sysctl file
2704 * @buffer: the user buffer
2705 * @lenp: the size of the user buffer
2706 * @ppos: file position
2707 *
2708 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2709 * values from/to the user buffer, treated as an ASCII string.
2710 * The values read are assumed to be in seconds, and are converted into
2711 * jiffies.
2712 *
2713 * Returns 0 on success.
2714 */
2715 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2716 void __user *buffer, size_t *lenp, loff_t *ppos)
2717 {
2718 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2719 do_proc_dointvec_jiffies_conv,NULL);
2720 }
2721
2722 /**
2723 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2724 * @table: the sysctl table
2725 * @write: %TRUE if this is a write to the sysctl file
2726 * @buffer: the user buffer
2727 * @lenp: the size of the user buffer
2728 * @ppos: pointer to the file position
2729 *
2730 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2731 * values from/to the user buffer, treated as an ASCII string.
2732 * The values read are assumed to be in 1/USER_HZ seconds, and
2733 * are converted into jiffies.
2734 *
2735 * Returns 0 on success.
2736 */
2737 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2738 void __user *buffer, size_t *lenp, loff_t *ppos)
2739 {
2740 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2741 do_proc_dointvec_userhz_jiffies_conv,NULL);
2742 }
2743
2744 /**
2745 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2746 * @table: the sysctl table
2747 * @write: %TRUE if this is a write to the sysctl file
2748 * @buffer: the user buffer
2749 * @lenp: the size of the user buffer
2750 * @ppos: file position
2751 * @ppos: the current position in the file
2752 *
2753 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2754 * values from/to the user buffer, treated as an ASCII string.
2755 * The values read are assumed to be in 1/1000 seconds, and
2756 * are converted into jiffies.
2757 *
2758 * Returns 0 on success.
2759 */
2760 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2761 void __user *buffer, size_t *lenp, loff_t *ppos)
2762 {
2763 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2764 do_proc_dointvec_ms_jiffies_conv, NULL);
2765 }
2766
2767 static int proc_do_cad_pid(struct ctl_table *table, int write,
2768 void __user *buffer, size_t *lenp, loff_t *ppos)
2769 {
2770 struct pid *new_pid;
2771 pid_t tmp;
2772 int r;
2773
2774 tmp = pid_vnr(cad_pid);
2775
2776 r = __do_proc_dointvec(&tmp, table, write, buffer,
2777 lenp, ppos, NULL, NULL);
2778 if (r || !write)
2779 return r;
2780
2781 new_pid = find_get_pid(tmp);
2782 if (!new_pid)
2783 return -ESRCH;
2784
2785 put_pid(xchg(&cad_pid, new_pid));
2786 return 0;
2787 }
2788
2789 /**
2790 * proc_do_large_bitmap - read/write from/to a large bitmap
2791 * @table: the sysctl table
2792 * @write: %TRUE if this is a write to the sysctl file
2793 * @buffer: the user buffer
2794 * @lenp: the size of the user buffer
2795 * @ppos: file position
2796 *
2797 * The bitmap is stored at table->data and the bitmap length (in bits)
2798 * in table->maxlen.
2799 *
2800 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2801 * large bitmaps may be represented in a compact manner. Writing into
2802 * the file will clear the bitmap then update it with the given input.
2803 *
2804 * Returns 0 on success.
2805 */
2806 int proc_do_large_bitmap(struct ctl_table *table, int write,
2807 void __user *buffer, size_t *lenp, loff_t *ppos)
2808 {
2809 int err = 0;
2810 bool first = 1;
2811 size_t left = *lenp;
2812 unsigned long bitmap_len = table->maxlen;
2813 unsigned long *bitmap = *(unsigned long **) table->data;
2814 unsigned long *tmp_bitmap = NULL;
2815 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2816
2817 if (!bitmap || !bitmap_len || !left || (*ppos && !write)) {
2818 *lenp = 0;
2819 return 0;
2820 }
2821
2822 if (write) {
2823 unsigned long page = 0;
2824 char *kbuf;
2825
2826 if (left > PAGE_SIZE - 1)
2827 left = PAGE_SIZE - 1;
2828
2829 page = __get_free_page(GFP_TEMPORARY);
2830 kbuf = (char *) page;
2831 if (!kbuf)
2832 return -ENOMEM;
2833 if (copy_from_user(kbuf, buffer, left)) {
2834 free_page(page);
2835 return -EFAULT;
2836 }
2837 kbuf[left] = 0;
2838
2839 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
2840 GFP_KERNEL);
2841 if (!tmp_bitmap) {
2842 free_page(page);
2843 return -ENOMEM;
2844 }
2845 proc_skip_char(&kbuf, &left, '\n');
2846 while (!err && left) {
2847 unsigned long val_a, val_b;
2848 bool neg;
2849
2850 err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a,
2851 sizeof(tr_a), &c);
2852 if (err)
2853 break;
2854 if (val_a >= bitmap_len || neg) {
2855 err = -EINVAL;
2856 break;
2857 }
2858
2859 val_b = val_a;
2860 if (left) {
2861 kbuf++;
2862 left--;
2863 }
2864
2865 if (c == '-') {
2866 err = proc_get_long(&kbuf, &left, &val_b,
2867 &neg, tr_b, sizeof(tr_b),
2868 &c);
2869 if (err)
2870 break;
2871 if (val_b >= bitmap_len || neg ||
2872 val_a > val_b) {
2873 err = -EINVAL;
2874 break;
2875 }
2876 if (left) {
2877 kbuf++;
2878 left--;
2879 }
2880 }
2881
2882 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
2883 first = 0;
2884 proc_skip_char(&kbuf, &left, '\n');
2885 }
2886 free_page(page);
2887 } else {
2888 unsigned long bit_a, bit_b = 0;
2889
2890 while (left) {
2891 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
2892 if (bit_a >= bitmap_len)
2893 break;
2894 bit_b = find_next_zero_bit(bitmap, bitmap_len,
2895 bit_a + 1) - 1;
2896
2897 if (!first) {
2898 err = proc_put_char(&buffer, &left, ',');
2899 if (err)
2900 break;
2901 }
2902 err = proc_put_long(&buffer, &left, bit_a, false);
2903 if (err)
2904 break;
2905 if (bit_a != bit_b) {
2906 err = proc_put_char(&buffer, &left, '-');
2907 if (err)
2908 break;
2909 err = proc_put_long(&buffer, &left, bit_b, false);
2910 if (err)
2911 break;
2912 }
2913
2914 first = 0; bit_b++;
2915 }
2916 if (!err)
2917 err = proc_put_char(&buffer, &left, '\n');
2918 }
2919
2920 if (!err) {
2921 if (write) {
2922 if (*ppos)
2923 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
2924 else
2925 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
2926 }
2927 kfree(tmp_bitmap);
2928 *lenp -= left;
2929 *ppos += *lenp;
2930 return 0;
2931 } else {
2932 kfree(tmp_bitmap);
2933 return err;
2934 }
2935 }
2936
2937 #else /* CONFIG_PROC_SYSCTL */
2938
2939 int proc_dostring(struct ctl_table *table, int write,
2940 void __user *buffer, size_t *lenp, loff_t *ppos)
2941 {
2942 return -ENOSYS;
2943 }
2944
2945 int proc_dointvec(struct ctl_table *table, int write,
2946 void __user *buffer, size_t *lenp, loff_t *ppos)
2947 {
2948 return -ENOSYS;
2949 }
2950
2951 int proc_douintvec(struct ctl_table *table, int write,
2952 void __user *buffer, size_t *lenp, loff_t *ppos)
2953 {
2954 return -ENOSYS;
2955 }
2956
2957 int proc_dointvec_minmax(struct ctl_table *table, int write,
2958 void __user *buffer, size_t *lenp, loff_t *ppos)
2959 {
2960 return -ENOSYS;
2961 }
2962
2963 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2964 void __user *buffer, size_t *lenp, loff_t *ppos)
2965 {
2966 return -ENOSYS;
2967 }
2968
2969 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2970 void __user *buffer, size_t *lenp, loff_t *ppos)
2971 {
2972 return -ENOSYS;
2973 }
2974
2975 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2976 void __user *buffer, size_t *lenp, loff_t *ppos)
2977 {
2978 return -ENOSYS;
2979 }
2980
2981 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2982 void __user *buffer, size_t *lenp, loff_t *ppos)
2983 {
2984 return -ENOSYS;
2985 }
2986
2987 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2988 void __user *buffer,
2989 size_t *lenp, loff_t *ppos)
2990 {
2991 return -ENOSYS;
2992 }
2993
2994
2995 #endif /* CONFIG_PROC_SYSCTL */
2996
2997 /*
2998 * No sense putting this after each symbol definition, twice,
2999 * exception granted :-)
3000 */
3001 EXPORT_SYMBOL(proc_dointvec);
3002 EXPORT_SYMBOL(proc_douintvec);
3003 EXPORT_SYMBOL(proc_dointvec_jiffies);
3004 EXPORT_SYMBOL(proc_dointvec_minmax);
3005 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
3006 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
3007 EXPORT_SYMBOL(proc_dostring);
3008 EXPORT_SYMBOL(proc_doulongvec_minmax);
3009 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);