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