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binder: fix possible UAF when freeing buffer
[GitHub/LineageOS/android_kernel_samsung_universal7580.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/mm.h>
23 #include <linux/swap.h>
24 #include <linux/slab.h>
25 #include <linux/sysctl.h>
26 #include <linux/bitmap.h>
27 #include <linux/signal.h>
28 #include <linux/printk.h>
29 #include <linux/proc_fs.h>
30 #include <linux/security.h>
31 #include <linux/ctype.h>
32 #include <linux/kmemcheck.h>
33 #include <linux/kmemleak.h>
34 #include <linux/fs.h>
35 #include <linux/init.h>
36 #include <linux/kernel.h>
37 #include <linux/kobject.h>
38 #include <linux/net.h>
39 #include <linux/sysrq.h>
40 #include <linux/highuid.h>
41 #include <linux/writeback.h>
42 #include <linux/ratelimit.h>
43 #include <linux/compaction.h>
44 #include <linux/hugetlb.h>
45 #include <linux/initrd.h>
46 #include <linux/key.h>
47 #include <linux/times.h>
48 #include <linux/limits.h>
49 #include <linux/dcache.h>
50 #include <linux/dnotify.h>
51 #include <linux/syscalls.h>
52 #include <linux/vmstat.h>
53 #include <linux/nfs_fs.h>
54 #include <linux/acpi.h>
55 #include <linux/reboot.h>
56 #include <linux/ftrace.h>
57 #include <linux/perf_event.h>
58 #include <linux/kprobes.h>
59 #include <linux/pipe_fs_i.h>
60 #include <linux/oom.h>
61 #include <linux/kmod.h>
62 #include <linux/capability.h>
63 #include <linux/binfmts.h>
64 #include <linux/sched/sysctl.h>
65
66 #include <asm/uaccess.h>
67 #include <asm/processor.h>
68
69 #ifdef CONFIG_X86
70 #include <asm/nmi.h>
71 #include <asm/stacktrace.h>
72 #include <asm/io.h>
73 #endif
74 #ifdef CONFIG_SPARC
75 #include <asm/setup.h>
76 #endif
77 #ifdef CONFIG_BSD_PROCESS_ACCT
78 #include <linux/acct.h>
79 #endif
80 #ifdef CONFIG_RT_MUTEXES
81 #include <linux/rtmutex.h>
82 #endif
83 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
84 #include <linux/lockdep.h>
85 #endif
86 #ifdef CONFIG_CHR_DEV_SG
87 #include <scsi/sg.h>
88 #endif
89
90 #ifdef CONFIG_LOCKUP_DETECTOR
91 #include <linux/nmi.h>
92 #endif
93
94
95 #if defined(CONFIG_SYSCTL)
96
97 /* External variables not in a header file. */
98 #ifdef CONFIG_USB
99 extern int deny_new_usb;
100 #endif
101 extern int sysctl_overcommit_memory;
102 extern int sysctl_overcommit_ratio;
103 extern int max_threads;
104 extern int suid_dumpable;
105 #ifdef CONFIG_COREDUMP
106 extern int core_uses_pid;
107 extern char core_pattern[];
108 extern unsigned int core_pipe_limit;
109 #endif
110 extern int pid_max;
111 extern int extra_free_kbytes;
112 extern int min_free_order_shift;
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 #ifdef CONFIG_BLOCK
122 extern int blk_iopoll_enabled;
123 #endif
124
125 /* Constants used for minimum and maximum */
126 #ifdef CONFIG_LOCKUP_DETECTOR
127 static int sixty = 60;
128 static int neg_one = -1;
129 #endif
130
131 static int zero;
132 static int __maybe_unused one = 1;
133 static int __maybe_unused two = 2;
134 static int __maybe_unused three = 3;
135 static int __maybe_unused four = 4;
136 static unsigned long one_ul = 1;
137 static int one_hundred = 100;
138 #ifdef CONFIG_INCREASE_MAXIMUM_SWAPPINESS
139 static int max_swappiness = 200;
140 #endif
141 #ifdef CONFIG_PRINTK
142 static int ten_thousand = 10000;
143 #endif
144
145 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
146 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
147
148 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
149 static int maxolduid = 65535;
150 static int minolduid;
151 static int min_percpu_pagelist_fract = 8;
152
153 static int ngroups_max = NGROUPS_MAX;
154 static const int cap_last_cap = CAP_LAST_CAP;
155
156 /*this is needed for proc_doulongvec_minmax of sysctl_hung_task_timeout_secs */
157 #ifdef CONFIG_DETECT_HUNG_TASK
158 static unsigned long hung_task_timeout_max = (LONG_MAX/HZ);
159 #endif
160
161 #ifdef CONFIG_INOTIFY_USER
162 #include <linux/inotify.h>
163 #endif
164 #ifdef CONFIG_SPARC
165 #endif
166
167 #ifdef CONFIG_SPARC64
168 extern int sysctl_tsb_ratio;
169 #endif
170
171 #ifdef __hppa__
172 extern int pwrsw_enabled;
173 #endif
174
175 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
176 extern int unaligned_enabled;
177 #endif
178
179 #ifdef CONFIG_IA64
180 extern int unaligned_dump_stack;
181 #endif
182
183 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
184 extern int no_unaligned_warning;
185 #endif
186
187 #ifdef CONFIG_PROC_SYSCTL
188 static int proc_do_cad_pid(struct ctl_table *table, int write,
189 void __user *buffer, size_t *lenp, loff_t *ppos);
190 static int proc_taint(struct ctl_table *table, int write,
191 void __user *buffer, size_t *lenp, loff_t *ppos);
192 #endif
193
194 #ifdef CONFIG_PRINTK
195 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
196 void __user *buffer, size_t *lenp, loff_t *ppos);
197 #endif
198
199 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
200 void __user *buffer, size_t *lenp, loff_t *ppos);
201 #ifdef CONFIG_COREDUMP
202 static int proc_dostring_coredump(struct ctl_table *table, int write,
203 void __user *buffer, size_t *lenp, loff_t *ppos);
204 #endif
205
206 #ifdef CONFIG_MAGIC_SYSRQ
207 /* Note: sysrq code uses it's own private copy */
208 static int __sysrq_enabled = SYSRQ_DEFAULT_ENABLE;
209
210 static int sysrq_sysctl_handler(ctl_table *table, int write,
211 void __user *buffer, size_t *lenp,
212 loff_t *ppos)
213 {
214 int error;
215
216 error = proc_dointvec(table, write, buffer, lenp, ppos);
217 if (error)
218 return error;
219
220 if (write)
221 sysrq_toggle_support(__sysrq_enabled);
222
223 return 0;
224 }
225
226 #endif
227
228 static struct ctl_table kern_table[];
229 static struct ctl_table vm_table[];
230 static struct ctl_table fs_table[];
231 static struct ctl_table debug_table[];
232 static struct ctl_table dev_table[];
233 extern struct ctl_table random_table[];
234 #ifdef CONFIG_EPOLL
235 extern struct ctl_table epoll_table[];
236 #endif
237
238 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
239 int sysctl_legacy_va_layout;
240 #endif
241
242 /* The default sysctl tables: */
243
244 static struct ctl_table sysctl_base_table[] = {
245 {
246 .procname = "kernel",
247 .mode = 0555,
248 .child = kern_table,
249 },
250 {
251 .procname = "vm",
252 .mode = 0555,
253 .child = vm_table,
254 },
255 {
256 .procname = "fs",
257 .mode = 0555,
258 .child = fs_table,
259 },
260 {
261 .procname = "debug",
262 .mode = 0555,
263 .child = debug_table,
264 },
265 {
266 .procname = "dev",
267 .mode = 0555,
268 .child = dev_table,
269 },
270 { }
271 };
272
273 #ifdef CONFIG_SCHED_DEBUG
274 static int min_sched_granularity_ns = 100000; /* 100 usecs */
275 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
276 static int min_wakeup_granularity_ns; /* 0 usecs */
277 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
278 #ifdef CONFIG_SMP
279 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
280 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
281 #endif /* CONFIG_SMP */
282 #endif /* CONFIG_SCHED_DEBUG */
283
284 #ifdef CONFIG_COMPACTION
285 static int min_extfrag_threshold;
286 static int max_extfrag_threshold = 1000;
287 #endif
288
289 static struct ctl_table kern_table[] = {
290 {
291 .procname = "sched_child_runs_first",
292 .data = &sysctl_sched_child_runs_first,
293 .maxlen = sizeof(unsigned int),
294 .mode = 0644,
295 .proc_handler = proc_dointvec,
296 },
297 #ifdef CONFIG_SCHED_DEBUG
298 {
299 .procname = "sched_min_granularity_ns",
300 .data = &sysctl_sched_min_granularity,
301 .maxlen = sizeof(unsigned int),
302 .mode = 0644,
303 .proc_handler = sched_proc_update_handler,
304 .extra1 = &min_sched_granularity_ns,
305 .extra2 = &max_sched_granularity_ns,
306 },
307 {
308 .procname = "sched_latency_ns",
309 .data = &sysctl_sched_latency,
310 .maxlen = sizeof(unsigned int),
311 .mode = 0644,
312 .proc_handler = sched_proc_update_handler,
313 .extra1 = &min_sched_granularity_ns,
314 .extra2 = &max_sched_granularity_ns,
315 },
316 {
317 .procname = "sched_wakeup_granularity_ns",
318 .data = &sysctl_sched_wakeup_granularity,
319 .maxlen = sizeof(unsigned int),
320 .mode = 0644,
321 .proc_handler = sched_proc_update_handler,
322 .extra1 = &min_wakeup_granularity_ns,
323 .extra2 = &max_wakeup_granularity_ns,
324 },
325 #ifdef CONFIG_SMP
326 {
327 .procname = "sched_tunable_scaling",
328 .data = &sysctl_sched_tunable_scaling,
329 .maxlen = sizeof(enum sched_tunable_scaling),
330 .mode = 0644,
331 .proc_handler = sched_proc_update_handler,
332 .extra1 = &min_sched_tunable_scaling,
333 .extra2 = &max_sched_tunable_scaling,
334 },
335 {
336 .procname = "sched_migration_cost_ns",
337 .data = &sysctl_sched_migration_cost,
338 .maxlen = sizeof(unsigned int),
339 .mode = 0644,
340 .proc_handler = proc_dointvec,
341 },
342 {
343 .procname = "sched_nr_migrate",
344 .data = &sysctl_sched_nr_migrate,
345 .maxlen = sizeof(unsigned int),
346 .mode = 0644,
347 .proc_handler = proc_dointvec,
348 },
349 {
350 .procname = "sched_time_avg_ms",
351 .data = &sysctl_sched_time_avg,
352 .maxlen = sizeof(unsigned int),
353 .mode = 0644,
354 .proc_handler = proc_dointvec,
355 },
356 {
357 .procname = "sched_shares_window_ns",
358 .data = &sysctl_sched_shares_window,
359 .maxlen = sizeof(unsigned int),
360 .mode = 0644,
361 .proc_handler = proc_dointvec,
362 },
363 {
364 .procname = "timer_migration",
365 .data = &sysctl_timer_migration,
366 .maxlen = sizeof(unsigned int),
367 .mode = 0644,
368 .proc_handler = proc_dointvec_minmax,
369 .extra1 = &zero,
370 .extra2 = &one,
371 },
372 #endif /* CONFIG_SMP */
373 #ifdef CONFIG_NUMA_BALANCING
374 {
375 .procname = "numa_balancing_scan_delay_ms",
376 .data = &sysctl_numa_balancing_scan_delay,
377 .maxlen = sizeof(unsigned int),
378 .mode = 0644,
379 .proc_handler = proc_dointvec,
380 },
381 {
382 .procname = "numa_balancing_scan_period_min_ms",
383 .data = &sysctl_numa_balancing_scan_period_min,
384 .maxlen = sizeof(unsigned int),
385 .mode = 0644,
386 .proc_handler = proc_dointvec,
387 },
388 {
389 .procname = "numa_balancing_scan_period_reset",
390 .data = &sysctl_numa_balancing_scan_period_reset,
391 .maxlen = sizeof(unsigned int),
392 .mode = 0644,
393 .proc_handler = proc_dointvec,
394 },
395 {
396 .procname = "numa_balancing_scan_period_max_ms",
397 .data = &sysctl_numa_balancing_scan_period_max,
398 .maxlen = sizeof(unsigned int),
399 .mode = 0644,
400 .proc_handler = proc_dointvec,
401 },
402 {
403 .procname = "numa_balancing_scan_size_mb",
404 .data = &sysctl_numa_balancing_scan_size,
405 .maxlen = sizeof(unsigned int),
406 .mode = 0644,
407 .proc_handler = proc_dointvec,
408 },
409 #endif /* CONFIG_NUMA_BALANCING */
410 #endif /* CONFIG_SCHED_DEBUG */
411 {
412 .procname = "sched_rt_period_us",
413 .data = &sysctl_sched_rt_period,
414 .maxlen = sizeof(unsigned int),
415 .mode = 0644,
416 .proc_handler = sched_rt_handler,
417 },
418 {
419 .procname = "sched_rt_runtime_us",
420 .data = &sysctl_sched_rt_runtime,
421 .maxlen = sizeof(int),
422 .mode = 0644,
423 .proc_handler = sched_rt_handler,
424 },
425 {
426 .procname = "sched_rr_timeslice_ms",
427 .data = &sched_rr_timeslice,
428 .maxlen = sizeof(int),
429 .mode = 0644,
430 .proc_handler = sched_rr_handler,
431 },
432 #ifdef CONFIG_SCHED_AUTOGROUP
433 {
434 .procname = "sched_autogroup_enabled",
435 .data = &sysctl_sched_autogroup_enabled,
436 .maxlen = sizeof(unsigned int),
437 .mode = 0644,
438 .proc_handler = proc_dointvec_minmax,
439 .extra1 = &zero,
440 .extra2 = &one,
441 },
442 #endif
443 #ifdef CONFIG_CFS_BANDWIDTH
444 {
445 .procname = "sched_cfs_bandwidth_slice_us",
446 .data = &sysctl_sched_cfs_bandwidth_slice,
447 .maxlen = sizeof(unsigned int),
448 .mode = 0644,
449 .proc_handler = proc_dointvec_minmax,
450 .extra1 = &one,
451 },
452 #endif
453 #ifdef CONFIG_PROVE_LOCKING
454 {
455 .procname = "prove_locking",
456 .data = &prove_locking,
457 .maxlen = sizeof(int),
458 .mode = 0644,
459 .proc_handler = proc_dointvec,
460 },
461 #endif
462 #ifdef CONFIG_LOCK_STAT
463 {
464 .procname = "lock_stat",
465 .data = &lock_stat,
466 .maxlen = sizeof(int),
467 .mode = 0644,
468 .proc_handler = proc_dointvec,
469 },
470 #endif
471 {
472 .procname = "panic",
473 .data = &panic_timeout,
474 .maxlen = sizeof(int),
475 .mode = 0644,
476 .proc_handler = proc_dointvec,
477 },
478 #ifdef CONFIG_COREDUMP
479 {
480 .procname = "core_uses_pid",
481 .data = &core_uses_pid,
482 .maxlen = sizeof(int),
483 .mode = 0644,
484 .proc_handler = proc_dointvec,
485 },
486 {
487 .procname = "core_pattern",
488 .data = core_pattern,
489 .maxlen = CORENAME_MAX_SIZE,
490 .mode = 0644,
491 .proc_handler = proc_dostring_coredump,
492 },
493 {
494 .procname = "core_pipe_limit",
495 .data = &core_pipe_limit,
496 .maxlen = sizeof(unsigned int),
497 .mode = 0644,
498 .proc_handler = proc_dointvec,
499 },
500 #endif
501 #ifdef CONFIG_PROC_SYSCTL
502 {
503 .procname = "tainted",
504 .maxlen = sizeof(long),
505 .mode = 0644,
506 .proc_handler = proc_taint,
507 },
508 #endif
509 #ifdef CONFIG_LATENCYTOP
510 {
511 .procname = "latencytop",
512 .data = &latencytop_enabled,
513 .maxlen = sizeof(int),
514 .mode = 0644,
515 .proc_handler = proc_dointvec,
516 },
517 #endif
518 #ifdef CONFIG_BLK_DEV_INITRD
519 {
520 .procname = "real-root-dev",
521 .data = &real_root_dev,
522 .maxlen = sizeof(int),
523 .mode = 0644,
524 .proc_handler = proc_dointvec,
525 },
526 #endif
527 {
528 .procname = "print-fatal-signals",
529 .data = &print_fatal_signals,
530 .maxlen = sizeof(int),
531 .mode = 0644,
532 .proc_handler = proc_dointvec,
533 },
534 #ifdef CONFIG_SPARC
535 {
536 .procname = "reboot-cmd",
537 .data = reboot_command,
538 .maxlen = 256,
539 .mode = 0644,
540 .proc_handler = proc_dostring,
541 },
542 {
543 .procname = "stop-a",
544 .data = &stop_a_enabled,
545 .maxlen = sizeof (int),
546 .mode = 0644,
547 .proc_handler = proc_dointvec,
548 },
549 {
550 .procname = "scons-poweroff",
551 .data = &scons_pwroff,
552 .maxlen = sizeof (int),
553 .mode = 0644,
554 .proc_handler = proc_dointvec,
555 },
556 #endif
557 #ifdef CONFIG_SPARC64
558 {
559 .procname = "tsb-ratio",
560 .data = &sysctl_tsb_ratio,
561 .maxlen = sizeof (int),
562 .mode = 0644,
563 .proc_handler = proc_dointvec,
564 },
565 #endif
566 #ifdef __hppa__
567 {
568 .procname = "soft-power",
569 .data = &pwrsw_enabled,
570 .maxlen = sizeof (int),
571 .mode = 0644,
572 .proc_handler = proc_dointvec,
573 },
574 #endif
575 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
576 {
577 .procname = "unaligned-trap",
578 .data = &unaligned_enabled,
579 .maxlen = sizeof (int),
580 .mode = 0644,
581 .proc_handler = proc_dointvec,
582 },
583 #endif
584 {
585 .procname = "ctrl-alt-del",
586 .data = &C_A_D,
587 .maxlen = sizeof(int),
588 .mode = 0644,
589 .proc_handler = proc_dointvec,
590 },
591 #ifdef CONFIG_FUNCTION_TRACER
592 {
593 .procname = "ftrace_enabled",
594 .data = &ftrace_enabled,
595 .maxlen = sizeof(int),
596 .mode = 0644,
597 .proc_handler = ftrace_enable_sysctl,
598 },
599 #endif
600 #ifdef CONFIG_STACK_TRACER
601 {
602 .procname = "stack_tracer_enabled",
603 .data = &stack_tracer_enabled,
604 .maxlen = sizeof(int),
605 .mode = 0644,
606 .proc_handler = stack_trace_sysctl,
607 },
608 #endif
609 #ifdef CONFIG_TRACING
610 {
611 .procname = "ftrace_dump_on_oops",
612 .data = &ftrace_dump_on_oops,
613 .maxlen = sizeof(int),
614 .mode = 0644,
615 .proc_handler = proc_dointvec,
616 },
617 #endif
618 #ifdef CONFIG_MODULES
619 {
620 .procname = "modprobe",
621 .data = &modprobe_path,
622 .maxlen = KMOD_PATH_LEN,
623 .mode = 0644,
624 .proc_handler = proc_dostring,
625 },
626 {
627 .procname = "modules_disabled",
628 .data = &modules_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
638 {
639 .procname = "hotplug",
640 .data = &uevent_helper,
641 .maxlen = UEVENT_HELPER_PATH_LEN,
642 .mode = 0644,
643 .proc_handler = proc_dostring,
644 },
645
646 #ifdef CONFIG_CHR_DEV_SG
647 {
648 .procname = "sg-big-buff",
649 .data = &sg_big_buff,
650 .maxlen = sizeof (int),
651 .mode = 0444,
652 .proc_handler = proc_dointvec,
653 },
654 #endif
655 #ifdef CONFIG_BSD_PROCESS_ACCT
656 {
657 .procname = "acct",
658 .data = &acct_parm,
659 .maxlen = 3*sizeof(int),
660 .mode = 0644,
661 .proc_handler = proc_dointvec,
662 },
663 #endif
664 #ifdef CONFIG_MAGIC_SYSRQ
665 {
666 .procname = "sysrq",
667 .data = &__sysrq_enabled,
668 .maxlen = sizeof (int),
669 .mode = 0644,
670 .proc_handler = sysrq_sysctl_handler,
671 },
672 #endif
673 #ifdef CONFIG_PROC_SYSCTL
674 {
675 .procname = "cad_pid",
676 .data = NULL,
677 .maxlen = sizeof (int),
678 .mode = 0600,
679 .proc_handler = proc_do_cad_pid,
680 },
681 #endif
682 {
683 .procname = "threads-max",
684 .data = &max_threads,
685 .maxlen = sizeof(int),
686 .mode = 0644,
687 .proc_handler = proc_dointvec,
688 },
689 {
690 .procname = "random",
691 .mode = 0555,
692 .child = random_table,
693 },
694 {
695 .procname = "usermodehelper",
696 .mode = 0555,
697 .child = usermodehelper_table,
698 },
699 {
700 .procname = "overflowuid",
701 .data = &overflowuid,
702 .maxlen = sizeof(int),
703 .mode = 0644,
704 .proc_handler = proc_dointvec_minmax,
705 .extra1 = &minolduid,
706 .extra2 = &maxolduid,
707 },
708 {
709 .procname = "overflowgid",
710 .data = &overflowgid,
711 .maxlen = sizeof(int),
712 .mode = 0644,
713 .proc_handler = proc_dointvec_minmax,
714 .extra1 = &minolduid,
715 .extra2 = &maxolduid,
716 },
717 #ifdef CONFIG_S390
718 #ifdef CONFIG_MATHEMU
719 {
720 .procname = "ieee_emulation_warnings",
721 .data = &sysctl_ieee_emulation_warnings,
722 .maxlen = sizeof(int),
723 .mode = 0644,
724 .proc_handler = proc_dointvec,
725 },
726 #endif
727 {
728 .procname = "userprocess_debug",
729 .data = &show_unhandled_signals,
730 .maxlen = sizeof(int),
731 .mode = 0644,
732 .proc_handler = proc_dointvec,
733 },
734 #endif
735 {
736 .procname = "pid_max",
737 .data = &pid_max,
738 .maxlen = sizeof (int),
739 .mode = 0644,
740 .proc_handler = proc_dointvec_minmax,
741 .extra1 = &pid_max_min,
742 .extra2 = &pid_max_max,
743 },
744 {
745 .procname = "panic_on_oops",
746 .data = &panic_on_oops,
747 .maxlen = sizeof(int),
748 .mode = 0644,
749 .proc_handler = proc_dointvec,
750 },
751 #if defined CONFIG_PRINTK
752 {
753 .procname = "printk",
754 .data = &console_loglevel,
755 .maxlen = 4*sizeof(int),
756 .mode = 0644,
757 .proc_handler = proc_dointvec,
758 },
759 {
760 .procname = "printk_ratelimit",
761 .data = &printk_ratelimit_state.interval,
762 .maxlen = sizeof(int),
763 .mode = 0644,
764 .proc_handler = proc_dointvec_jiffies,
765 },
766 {
767 .procname = "printk_ratelimit_burst",
768 .data = &printk_ratelimit_state.burst,
769 .maxlen = sizeof(int),
770 .mode = 0644,
771 .proc_handler = proc_dointvec,
772 },
773 {
774 .procname = "printk_delay",
775 .data = &printk_delay_msec,
776 .maxlen = sizeof(int),
777 .mode = 0644,
778 .proc_handler = proc_dointvec_minmax,
779 .extra1 = &zero,
780 .extra2 = &ten_thousand,
781 },
782 {
783 .procname = "dmesg_restrict",
784 .data = &dmesg_restrict,
785 .maxlen = sizeof(int),
786 .mode = 0644,
787 .proc_handler = proc_dointvec_minmax_sysadmin,
788 .extra1 = &zero,
789 .extra2 = &one,
790 },
791 {
792 .procname = "kptr_restrict",
793 .data = &kptr_restrict,
794 .maxlen = sizeof(int),
795 .mode = 0644,
796 .proc_handler = proc_dointvec_minmax_sysadmin,
797 .extra1 = &zero,
798 .extra2 = &four,
799 },
800 #endif
801 #ifdef CONFIG_USB
802 {
803 .procname = "deny_new_usb",
804 .data = &deny_new_usb,
805 .maxlen = sizeof(int),
806 .mode = 0644,
807 .proc_handler = proc_dointvec_minmax_sysadmin,
808 .extra1 = &zero,
809 .extra2 = &one,
810 },
811 #endif
812 {
813 .procname = "ngroups_max",
814 .data = &ngroups_max,
815 .maxlen = sizeof (int),
816 .mode = 0444,
817 .proc_handler = proc_dointvec,
818 },
819 {
820 .procname = "cap_last_cap",
821 .data = (void *)&cap_last_cap,
822 .maxlen = sizeof(int),
823 .mode = 0444,
824 .proc_handler = proc_dointvec,
825 },
826 #if defined(CONFIG_LOCKUP_DETECTOR)
827 {
828 .procname = "watchdog",
829 .data = &watchdog_enabled,
830 .maxlen = sizeof (int),
831 .mode = 0644,
832 .proc_handler = proc_dowatchdog,
833 .extra1 = &zero,
834 .extra2 = &one,
835 },
836 {
837 .procname = "watchdog_thresh",
838 .data = &watchdog_thresh,
839 .maxlen = sizeof(int),
840 .mode = 0644,
841 .proc_handler = proc_dowatchdog,
842 .extra1 = &neg_one,
843 .extra2 = &sixty,
844 },
845 {
846 .procname = "softlockup_panic",
847 .data = &softlockup_panic,
848 .maxlen = sizeof(int),
849 .mode = 0644,
850 .proc_handler = proc_dointvec_minmax,
851 .extra1 = &zero,
852 .extra2 = &one,
853 },
854 {
855 .procname = "nmi_watchdog",
856 .data = &watchdog_enabled,
857 .maxlen = sizeof (int),
858 .mode = 0644,
859 .proc_handler = proc_dowatchdog,
860 .extra1 = &zero,
861 .extra2 = &one,
862 },
863 #endif
864 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
865 {
866 .procname = "unknown_nmi_panic",
867 .data = &unknown_nmi_panic,
868 .maxlen = sizeof (int),
869 .mode = 0644,
870 .proc_handler = proc_dointvec,
871 },
872 #endif
873 #if defined(CONFIG_X86)
874 {
875 .procname = "panic_on_unrecovered_nmi",
876 .data = &panic_on_unrecovered_nmi,
877 .maxlen = sizeof(int),
878 .mode = 0644,
879 .proc_handler = proc_dointvec,
880 },
881 {
882 .procname = "panic_on_io_nmi",
883 .data = &panic_on_io_nmi,
884 .maxlen = sizeof(int),
885 .mode = 0644,
886 .proc_handler = proc_dointvec,
887 },
888 #ifdef CONFIG_DEBUG_STACKOVERFLOW
889 {
890 .procname = "panic_on_stackoverflow",
891 .data = &sysctl_panic_on_stackoverflow,
892 .maxlen = sizeof(int),
893 .mode = 0644,
894 .proc_handler = proc_dointvec,
895 },
896 #endif
897 {
898 .procname = "bootloader_type",
899 .data = &bootloader_type,
900 .maxlen = sizeof (int),
901 .mode = 0444,
902 .proc_handler = proc_dointvec,
903 },
904 {
905 .procname = "bootloader_version",
906 .data = &bootloader_version,
907 .maxlen = sizeof (int),
908 .mode = 0444,
909 .proc_handler = proc_dointvec,
910 },
911 {
912 .procname = "kstack_depth_to_print",
913 .data = &kstack_depth_to_print,
914 .maxlen = sizeof(int),
915 .mode = 0644,
916 .proc_handler = proc_dointvec,
917 },
918 {
919 .procname = "io_delay_type",
920 .data = &io_delay_type,
921 .maxlen = sizeof(int),
922 .mode = 0644,
923 .proc_handler = proc_dointvec,
924 },
925 #endif
926 #if defined(CONFIG_MMU)
927 {
928 .procname = "randomize_va_space",
929 .data = &randomize_va_space,
930 .maxlen = sizeof(int),
931 .mode = 0644,
932 .proc_handler = proc_dointvec,
933 },
934 #endif
935 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
936 {
937 .procname = "spin_retry",
938 .data = &spin_retry,
939 .maxlen = sizeof (int),
940 .mode = 0644,
941 .proc_handler = proc_dointvec,
942 },
943 #endif
944 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
945 {
946 .procname = "acpi_video_flags",
947 .data = &acpi_realmode_flags,
948 .maxlen = sizeof (unsigned long),
949 .mode = 0644,
950 .proc_handler = proc_doulongvec_minmax,
951 },
952 #endif
953 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
954 {
955 .procname = "ignore-unaligned-usertrap",
956 .data = &no_unaligned_warning,
957 .maxlen = sizeof (int),
958 .mode = 0644,
959 .proc_handler = proc_dointvec,
960 },
961 #endif
962 #ifdef CONFIG_IA64
963 {
964 .procname = "unaligned-dump-stack",
965 .data = &unaligned_dump_stack,
966 .maxlen = sizeof (int),
967 .mode = 0644,
968 .proc_handler = proc_dointvec,
969 },
970 #endif
971 #ifdef CONFIG_DETECT_HUNG_TASK
972 {
973 .procname = "hung_task_panic",
974 .data = &sysctl_hung_task_panic,
975 .maxlen = sizeof(int),
976 .mode = 0644,
977 .proc_handler = proc_dointvec_minmax,
978 .extra1 = &zero,
979 .extra2 = &one,
980 },
981 {
982 .procname = "hung_task_check_count",
983 .data = &sysctl_hung_task_check_count,
984 .maxlen = sizeof(unsigned long),
985 .mode = 0644,
986 .proc_handler = proc_doulongvec_minmax,
987 },
988 {
989 .procname = "hung_task_timeout_secs",
990 .data = &sysctl_hung_task_timeout_secs,
991 .maxlen = sizeof(unsigned long),
992 .mode = 0644,
993 .proc_handler = proc_dohung_task_timeout_secs,
994 .extra2 = &hung_task_timeout_max,
995 },
996 {
997 .procname = "hung_task_warnings",
998 .data = &sysctl_hung_task_warnings,
999 .maxlen = sizeof(unsigned long),
1000 .mode = 0644,
1001 .proc_handler = proc_doulongvec_minmax,
1002 },
1003 #endif
1004 #ifdef CONFIG_COMPAT
1005 {
1006 .procname = "compat-log",
1007 .data = &compat_log,
1008 .maxlen = sizeof (int),
1009 .mode = 0644,
1010 .proc_handler = proc_dointvec,
1011 },
1012 #endif
1013 #ifdef CONFIG_RT_MUTEXES
1014 {
1015 .procname = "max_lock_depth",
1016 .data = &max_lock_depth,
1017 .maxlen = sizeof(int),
1018 .mode = 0644,
1019 .proc_handler = proc_dointvec,
1020 },
1021 #endif
1022 {
1023 .procname = "poweroff_cmd",
1024 .data = &poweroff_cmd,
1025 .maxlen = POWEROFF_CMD_PATH_LEN,
1026 .mode = 0644,
1027 .proc_handler = proc_dostring,
1028 },
1029 #ifdef CONFIG_KEYS
1030 {
1031 .procname = "keys",
1032 .mode = 0555,
1033 .child = key_sysctls,
1034 },
1035 #endif
1036 #ifdef CONFIG_RCU_TORTURE_TEST
1037 {
1038 .procname = "rcutorture_runnable",
1039 .data = &rcutorture_runnable,
1040 .maxlen = sizeof(int),
1041 .mode = 0644,
1042 .proc_handler = proc_dointvec,
1043 },
1044 #endif
1045 #ifdef CONFIG_PERF_EVENTS
1046 /*
1047 * User-space scripts rely on the existence of this file
1048 * as a feature check for perf_events being enabled.
1049 *
1050 * So it's an ABI, do not remove!
1051 */
1052 {
1053 .procname = "perf_event_paranoid",
1054 .data = &sysctl_perf_event_paranoid,
1055 .maxlen = sizeof(sysctl_perf_event_paranoid),
1056 .mode = 0644,
1057 .proc_handler = proc_dointvec,
1058 },
1059 {
1060 .procname = "perf_event_mlock_kb",
1061 .data = &sysctl_perf_event_mlock,
1062 .maxlen = sizeof(sysctl_perf_event_mlock),
1063 .mode = 0644,
1064 .proc_handler = proc_dointvec,
1065 },
1066 {
1067 .procname = "perf_event_max_sample_rate",
1068 .data = &sysctl_perf_event_sample_rate,
1069 .maxlen = sizeof(sysctl_perf_event_sample_rate),
1070 .mode = 0644,
1071 .proc_handler = perf_proc_update_handler,
1072 .extra1 = &one,
1073 },
1074 {
1075 .procname = "perf_cpu_time_max_percent",
1076 .data = &sysctl_perf_cpu_time_max_percent,
1077 .maxlen = sizeof(sysctl_perf_cpu_time_max_percent),
1078 .mode = 0644,
1079 .proc_handler = perf_cpu_time_max_percent_handler,
1080 .extra1 = &zero,
1081 .extra2 = &one_hundred,
1082 },
1083 #endif
1084 #ifdef CONFIG_KMEMCHECK
1085 {
1086 .procname = "kmemcheck",
1087 .data = &kmemcheck_enabled,
1088 .maxlen = sizeof(int),
1089 .mode = 0644,
1090 .proc_handler = proc_dointvec,
1091 },
1092 #endif
1093 #ifdef CONFIG_BLOCK
1094 {
1095 .procname = "blk_iopoll",
1096 .data = &blk_iopoll_enabled,
1097 .maxlen = sizeof(int),
1098 .mode = 0644,
1099 .proc_handler = proc_dointvec,
1100 },
1101 #endif
1102 { }
1103 };
1104
1105 static struct ctl_table vm_table[] = {
1106 {
1107 .procname = "overcommit_memory",
1108 .data = &sysctl_overcommit_memory,
1109 .maxlen = sizeof(sysctl_overcommit_memory),
1110 .mode = 0644,
1111 .proc_handler = proc_dointvec_minmax,
1112 .extra1 = &zero,
1113 .extra2 = &two,
1114 },
1115 {
1116 .procname = "panic_on_oom",
1117 .data = &sysctl_panic_on_oom,
1118 .maxlen = sizeof(sysctl_panic_on_oom),
1119 .mode = 0644,
1120 .proc_handler = proc_dointvec_minmax,
1121 .extra1 = &zero,
1122 .extra2 = &two,
1123 },
1124 {
1125 .procname = "oom_kill_allocating_task",
1126 .data = &sysctl_oom_kill_allocating_task,
1127 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1128 .mode = 0644,
1129 .proc_handler = proc_dointvec,
1130 },
1131 {
1132 .procname = "oom_dump_tasks",
1133 .data = &sysctl_oom_dump_tasks,
1134 .maxlen = sizeof(sysctl_oom_dump_tasks),
1135 .mode = 0644,
1136 .proc_handler = proc_dointvec,
1137 },
1138 {
1139 .procname = "overcommit_ratio",
1140 .data = &sysctl_overcommit_ratio,
1141 .maxlen = sizeof(sysctl_overcommit_ratio),
1142 .mode = 0644,
1143 .proc_handler = proc_dointvec,
1144 },
1145 {
1146 .procname = "page-cluster",
1147 .data = &page_cluster,
1148 .maxlen = sizeof(int),
1149 .mode = 0644,
1150 .proc_handler = proc_dointvec_minmax,
1151 .extra1 = &zero,
1152 },
1153 {
1154 .procname = "dirty_background_ratio",
1155 .data = &dirty_background_ratio,
1156 .maxlen = sizeof(dirty_background_ratio),
1157 .mode = 0644,
1158 .proc_handler = dirty_background_ratio_handler,
1159 .extra1 = &zero,
1160 .extra2 = &one_hundred,
1161 },
1162 {
1163 .procname = "dirty_background_bytes",
1164 .data = &dirty_background_bytes,
1165 .maxlen = sizeof(dirty_background_bytes),
1166 .mode = 0644,
1167 .proc_handler = dirty_background_bytes_handler,
1168 .extra1 = &one_ul,
1169 },
1170 {
1171 .procname = "dirty_ratio",
1172 .data = &vm_dirty_ratio,
1173 .maxlen = sizeof(vm_dirty_ratio),
1174 .mode = 0644,
1175 .proc_handler = dirty_ratio_handler,
1176 .extra1 = &zero,
1177 .extra2 = &one_hundred,
1178 },
1179 {
1180 .procname = "dirty_bytes",
1181 .data = &vm_dirty_bytes,
1182 .maxlen = sizeof(vm_dirty_bytes),
1183 .mode = 0644,
1184 .proc_handler = dirty_bytes_handler,
1185 .extra1 = &dirty_bytes_min,
1186 },
1187 {
1188 .procname = "dirty_writeback_centisecs",
1189 .data = &dirty_writeback_interval,
1190 .maxlen = sizeof(dirty_writeback_interval),
1191 .mode = 0644,
1192 .proc_handler = dirty_writeback_centisecs_handler,
1193 },
1194 {
1195 .procname = "dirty_expire_centisecs",
1196 .data = &dirty_expire_interval,
1197 .maxlen = sizeof(dirty_expire_interval),
1198 .mode = 0644,
1199 .proc_handler = proc_dointvec_minmax,
1200 .extra1 = &zero,
1201 },
1202 {
1203 .procname = "nr_pdflush_threads",
1204 .mode = 0444 /* read-only */,
1205 .proc_handler = pdflush_proc_obsolete,
1206 },
1207 {
1208 .procname = "swappiness",
1209 .data = &vm_swappiness,
1210 .maxlen = sizeof(vm_swappiness),
1211 .mode = 0644,
1212 .proc_handler = proc_dointvec_minmax,
1213 .extra1 = &zero,
1214 #ifdef CONFIG_INCREASE_MAXIMUM_SWAPPINESS
1215 .extra2 = &max_swappiness,
1216 #else
1217 .extra2 = &one_hundred,
1218 #endif
1219 },
1220 #ifdef CONFIG_HUGETLB_PAGE
1221 {
1222 .procname = "nr_hugepages",
1223 .data = NULL,
1224 .maxlen = sizeof(unsigned long),
1225 .mode = 0644,
1226 .proc_handler = hugetlb_sysctl_handler,
1227 .extra1 = (void *)&hugetlb_zero,
1228 .extra2 = (void *)&hugetlb_infinity,
1229 },
1230 #ifdef CONFIG_NUMA
1231 {
1232 .procname = "nr_hugepages_mempolicy",
1233 .data = NULL,
1234 .maxlen = sizeof(unsigned long),
1235 .mode = 0644,
1236 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
1237 .extra1 = (void *)&hugetlb_zero,
1238 .extra2 = (void *)&hugetlb_infinity,
1239 },
1240 #endif
1241 {
1242 .procname = "hugetlb_shm_group",
1243 .data = &sysctl_hugetlb_shm_group,
1244 .maxlen = sizeof(gid_t),
1245 .mode = 0644,
1246 .proc_handler = proc_dointvec,
1247 },
1248 {
1249 .procname = "hugepages_treat_as_movable",
1250 .data = &hugepages_treat_as_movable,
1251 .maxlen = sizeof(int),
1252 .mode = 0644,
1253 .proc_handler = hugetlb_treat_movable_handler,
1254 },
1255 {
1256 .procname = "nr_overcommit_hugepages",
1257 .data = NULL,
1258 .maxlen = sizeof(unsigned long),
1259 .mode = 0644,
1260 .proc_handler = hugetlb_overcommit_handler,
1261 .extra1 = (void *)&hugetlb_zero,
1262 .extra2 = (void *)&hugetlb_infinity,
1263 },
1264 #endif
1265 {
1266 .procname = "lowmem_reserve_ratio",
1267 .data = &sysctl_lowmem_reserve_ratio,
1268 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1269 .mode = 0644,
1270 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
1271 },
1272 {
1273 .procname = "drop_caches",
1274 .data = &sysctl_drop_caches,
1275 .maxlen = sizeof(int),
1276 .mode = 0644,
1277 .proc_handler = drop_caches_sysctl_handler,
1278 .extra1 = &one,
1279 .extra2 = &three,
1280 },
1281 #ifdef CONFIG_COMPACTION
1282 {
1283 .procname = "compact_memory",
1284 .data = &sysctl_compact_memory,
1285 .maxlen = sizeof(int),
1286 .mode = 0644,
1287 .proc_handler = sysctl_compaction_handler,
1288 },
1289 {
1290 .procname = "extfrag_threshold",
1291 .data = &sysctl_extfrag_threshold,
1292 .maxlen = sizeof(int),
1293 .mode = 0644,
1294 .proc_handler = sysctl_extfrag_handler,
1295 .extra1 = &min_extfrag_threshold,
1296 .extra2 = &max_extfrag_threshold,
1297 },
1298
1299 #endif /* CONFIG_COMPACTION */
1300 {
1301 .procname = "min_free_kbytes",
1302 .data = &min_free_kbytes,
1303 .maxlen = sizeof(min_free_kbytes),
1304 .mode = 0644,
1305 .proc_handler = min_free_kbytes_sysctl_handler,
1306 .extra1 = &zero,
1307 },
1308 {
1309 .procname = "extra_free_kbytes",
1310 .data = &extra_free_kbytes,
1311 .maxlen = sizeof(extra_free_kbytes),
1312 .mode = 0644,
1313 .proc_handler = min_free_kbytes_sysctl_handler,
1314 .extra1 = &zero,
1315 },
1316 {
1317 .procname = "min_free_order_shift",
1318 .data = &min_free_order_shift,
1319 .maxlen = sizeof(min_free_order_shift),
1320 .mode = 0644,
1321 .proc_handler = &proc_dointvec
1322 },
1323 {
1324 .procname = "percpu_pagelist_fraction",
1325 .data = &percpu_pagelist_fraction,
1326 .maxlen = sizeof(percpu_pagelist_fraction),
1327 .mode = 0644,
1328 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
1329 .extra1 = &min_percpu_pagelist_fract,
1330 },
1331 #ifdef CONFIG_MMU
1332 {
1333 .procname = "max_map_count",
1334 .data = &sysctl_max_map_count,
1335 .maxlen = sizeof(sysctl_max_map_count),
1336 .mode = 0644,
1337 .proc_handler = proc_dointvec_minmax,
1338 .extra1 = &zero,
1339 },
1340 #else
1341 {
1342 .procname = "nr_trim_pages",
1343 .data = &sysctl_nr_trim_pages,
1344 .maxlen = sizeof(sysctl_nr_trim_pages),
1345 .mode = 0644,
1346 .proc_handler = proc_dointvec_minmax,
1347 .extra1 = &zero,
1348 },
1349 #endif
1350 {
1351 .procname = "laptop_mode",
1352 .data = &laptop_mode,
1353 .maxlen = sizeof(laptop_mode),
1354 .mode = 0644,
1355 .proc_handler = proc_dointvec_jiffies,
1356 },
1357 {
1358 .procname = "block_dump",
1359 .data = &block_dump,
1360 .maxlen = sizeof(block_dump),
1361 .mode = 0644,
1362 .proc_handler = proc_dointvec,
1363 .extra1 = &zero,
1364 },
1365 {
1366 .procname = "vfs_cache_pressure",
1367 .data = &sysctl_vfs_cache_pressure,
1368 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1369 .mode = 0644,
1370 .proc_handler = proc_dointvec,
1371 .extra1 = &zero,
1372 },
1373 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1374 {
1375 .procname = "legacy_va_layout",
1376 .data = &sysctl_legacy_va_layout,
1377 .maxlen = sizeof(sysctl_legacy_va_layout),
1378 .mode = 0644,
1379 .proc_handler = proc_dointvec,
1380 .extra1 = &zero,
1381 },
1382 #endif
1383 #ifdef CONFIG_NUMA
1384 {
1385 .procname = "zone_reclaim_mode",
1386 .data = &zone_reclaim_mode,
1387 .maxlen = sizeof(zone_reclaim_mode),
1388 .mode = 0644,
1389 .proc_handler = proc_dointvec,
1390 .extra1 = &zero,
1391 },
1392 {
1393 .procname = "min_unmapped_ratio",
1394 .data = &sysctl_min_unmapped_ratio,
1395 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1396 .mode = 0644,
1397 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
1398 .extra1 = &zero,
1399 .extra2 = &one_hundred,
1400 },
1401 {
1402 .procname = "min_slab_ratio",
1403 .data = &sysctl_min_slab_ratio,
1404 .maxlen = sizeof(sysctl_min_slab_ratio),
1405 .mode = 0644,
1406 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
1407 .extra1 = &zero,
1408 .extra2 = &one_hundred,
1409 },
1410 #endif
1411 #ifdef CONFIG_SMP
1412 {
1413 .procname = "stat_interval",
1414 .data = &sysctl_stat_interval,
1415 .maxlen = sizeof(sysctl_stat_interval),
1416 .mode = 0644,
1417 .proc_handler = proc_dointvec_jiffies,
1418 },
1419 #endif
1420 #ifdef CONFIG_MMU
1421 {
1422 .procname = "mmap_min_addr",
1423 .data = &dac_mmap_min_addr,
1424 .maxlen = sizeof(unsigned long),
1425 .mode = 0644,
1426 .proc_handler = mmap_min_addr_handler,
1427 },
1428 #endif
1429 #ifdef CONFIG_NUMA
1430 {
1431 .procname = "numa_zonelist_order",
1432 .data = &numa_zonelist_order,
1433 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1434 .mode = 0644,
1435 .proc_handler = numa_zonelist_order_handler,
1436 },
1437 #endif
1438 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1439 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1440 {
1441 .procname = "vdso_enabled",
1442 .data = &vdso_enabled,
1443 .maxlen = sizeof(vdso_enabled),
1444 .mode = 0644,
1445 .proc_handler = proc_dointvec,
1446 .extra1 = &zero,
1447 },
1448 #endif
1449 #ifdef CONFIG_HIGHMEM
1450 {
1451 .procname = "highmem_is_dirtyable",
1452 .data = &vm_highmem_is_dirtyable,
1453 .maxlen = sizeof(vm_highmem_is_dirtyable),
1454 .mode = 0644,
1455 .proc_handler = proc_dointvec_minmax,
1456 .extra1 = &zero,
1457 .extra2 = &one,
1458 },
1459 #endif
1460 {
1461 .procname = "scan_unevictable_pages",
1462 .data = &scan_unevictable_pages,
1463 .maxlen = sizeof(scan_unevictable_pages),
1464 .mode = 0644,
1465 .proc_handler = scan_unevictable_handler,
1466 },
1467 #ifdef CONFIG_MEMORY_FAILURE
1468 {
1469 .procname = "memory_failure_early_kill",
1470 .data = &sysctl_memory_failure_early_kill,
1471 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1472 .mode = 0644,
1473 .proc_handler = proc_dointvec_minmax,
1474 .extra1 = &zero,
1475 .extra2 = &one,
1476 },
1477 {
1478 .procname = "memory_failure_recovery",
1479 .data = &sysctl_memory_failure_recovery,
1480 .maxlen = sizeof(sysctl_memory_failure_recovery),
1481 .mode = 0644,
1482 .proc_handler = proc_dointvec_minmax,
1483 .extra1 = &zero,
1484 .extra2 = &one,
1485 },
1486 #endif
1487 {
1488 .procname = "user_reserve_kbytes",
1489 .data = &sysctl_user_reserve_kbytes,
1490 .maxlen = sizeof(sysctl_user_reserve_kbytes),
1491 .mode = 0644,
1492 .proc_handler = proc_doulongvec_minmax,
1493 },
1494 {
1495 .procname = "admin_reserve_kbytes",
1496 .data = &sysctl_admin_reserve_kbytes,
1497 .maxlen = sizeof(sysctl_admin_reserve_kbytes),
1498 .mode = 0644,
1499 .proc_handler = proc_doulongvec_minmax,
1500 },
1501 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS
1502 {
1503 .procname = "mmap_rnd_bits",
1504 .data = &mmap_rnd_bits,
1505 .maxlen = sizeof(mmap_rnd_bits),
1506 .mode = 0600,
1507 .proc_handler = proc_dointvec_minmax,
1508 .extra1 = (void *)&mmap_rnd_bits_min,
1509 .extra2 = (void *)&mmap_rnd_bits_max,
1510 },
1511 #endif
1512 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS
1513 {
1514 .procname = "mmap_rnd_compat_bits",
1515 .data = &mmap_rnd_compat_bits,
1516 .maxlen = sizeof(mmap_rnd_compat_bits),
1517 .mode = 0600,
1518 .proc_handler = proc_dointvec_minmax,
1519 .extra1 = (void *)&mmap_rnd_compat_bits_min,
1520 .extra2 = (void *)&mmap_rnd_compat_bits_max,
1521 },
1522 #endif
1523 { }
1524 };
1525
1526 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1527 static struct ctl_table binfmt_misc_table[] = {
1528 { }
1529 };
1530 #endif
1531
1532 static struct ctl_table fs_table[] = {
1533 {
1534 .procname = "inode-nr",
1535 .data = &inodes_stat,
1536 .maxlen = 2*sizeof(int),
1537 .mode = 0444,
1538 .proc_handler = proc_nr_inodes,
1539 },
1540 {
1541 .procname = "inode-state",
1542 .data = &inodes_stat,
1543 .maxlen = 7*sizeof(int),
1544 .mode = 0444,
1545 .proc_handler = proc_nr_inodes,
1546 },
1547 {
1548 .procname = "file-nr",
1549 .data = &files_stat,
1550 .maxlen = sizeof(files_stat),
1551 .mode = 0444,
1552 .proc_handler = proc_nr_files,
1553 },
1554 {
1555 .procname = "file-max",
1556 .data = &files_stat.max_files,
1557 .maxlen = sizeof(files_stat.max_files),
1558 .mode = 0644,
1559 .proc_handler = proc_doulongvec_minmax,
1560 },
1561 {
1562 .procname = "nr_open",
1563 .data = &sysctl_nr_open,
1564 .maxlen = sizeof(int),
1565 .mode = 0644,
1566 .proc_handler = proc_dointvec_minmax,
1567 .extra1 = &sysctl_nr_open_min,
1568 .extra2 = &sysctl_nr_open_max,
1569 },
1570 {
1571 .procname = "dentry-state",
1572 .data = &dentry_stat,
1573 .maxlen = 6*sizeof(int),
1574 .mode = 0444,
1575 .proc_handler = proc_nr_dentry,
1576 },
1577 {
1578 .procname = "overflowuid",
1579 .data = &fs_overflowuid,
1580 .maxlen = sizeof(int),
1581 .mode = 0644,
1582 .proc_handler = proc_dointvec_minmax,
1583 .extra1 = &minolduid,
1584 .extra2 = &maxolduid,
1585 },
1586 {
1587 .procname = "overflowgid",
1588 .data = &fs_overflowgid,
1589 .maxlen = sizeof(int),
1590 .mode = 0644,
1591 .proc_handler = proc_dointvec_minmax,
1592 .extra1 = &minolduid,
1593 .extra2 = &maxolduid,
1594 },
1595 #ifdef CONFIG_FILE_LOCKING
1596 {
1597 .procname = "leases-enable",
1598 .data = &leases_enable,
1599 .maxlen = sizeof(int),
1600 .mode = 0644,
1601 .proc_handler = proc_dointvec,
1602 },
1603 #endif
1604 #ifdef CONFIG_DNOTIFY
1605 {
1606 .procname = "dir-notify-enable",
1607 .data = &dir_notify_enable,
1608 .maxlen = sizeof(int),
1609 .mode = 0644,
1610 .proc_handler = proc_dointvec,
1611 },
1612 #endif
1613 #ifdef CONFIG_MMU
1614 #ifdef CONFIG_FILE_LOCKING
1615 {
1616 .procname = "lease-break-time",
1617 .data = &lease_break_time,
1618 .maxlen = sizeof(int),
1619 .mode = 0644,
1620 .proc_handler = proc_dointvec,
1621 },
1622 #endif
1623 #ifdef CONFIG_AIO
1624 {
1625 .procname = "aio-nr",
1626 .data = &aio_nr,
1627 .maxlen = sizeof(aio_nr),
1628 .mode = 0444,
1629 .proc_handler = proc_doulongvec_minmax,
1630 },
1631 {
1632 .procname = "aio-max-nr",
1633 .data = &aio_max_nr,
1634 .maxlen = sizeof(aio_max_nr),
1635 .mode = 0644,
1636 .proc_handler = proc_doulongvec_minmax,
1637 },
1638 #endif /* CONFIG_AIO */
1639 #ifdef CONFIG_INOTIFY_USER
1640 {
1641 .procname = "inotify",
1642 .mode = 0555,
1643 .child = inotify_table,
1644 },
1645 #endif
1646 #ifdef CONFIG_EPOLL
1647 {
1648 .procname = "epoll",
1649 .mode = 0555,
1650 .child = epoll_table,
1651 },
1652 #endif
1653 #endif
1654 {
1655 .procname = "protected_symlinks",
1656 .data = &sysctl_protected_symlinks,
1657 .maxlen = sizeof(int),
1658 .mode = 0600,
1659 .proc_handler = proc_dointvec_minmax,
1660 .extra1 = &zero,
1661 .extra2 = &one,
1662 },
1663 {
1664 .procname = "protected_hardlinks",
1665 .data = &sysctl_protected_hardlinks,
1666 .maxlen = sizeof(int),
1667 .mode = 0600,
1668 .proc_handler = proc_dointvec_minmax,
1669 .extra1 = &zero,
1670 .extra2 = &one,
1671 },
1672 {
1673 .procname = "suid_dumpable",
1674 .data = &suid_dumpable,
1675 .maxlen = sizeof(int),
1676 .mode = 0644,
1677 .proc_handler = proc_dointvec_minmax_coredump,
1678 .extra1 = &zero,
1679 .extra2 = &two,
1680 },
1681 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1682 {
1683 .procname = "binfmt_misc",
1684 .mode = 0555,
1685 .child = binfmt_misc_table,
1686 },
1687 #endif
1688 {
1689 .procname = "pipe-max-size",
1690 .data = &pipe_max_size,
1691 .maxlen = sizeof(int),
1692 .mode = 0644,
1693 .proc_handler = &pipe_proc_fn,
1694 .extra1 = &pipe_min_size,
1695 },
1696 {
1697 .procname = "pipe-user-pages-hard",
1698 .data = &pipe_user_pages_hard,
1699 .maxlen = sizeof(pipe_user_pages_hard),
1700 .mode = 0644,
1701 .proc_handler = proc_doulongvec_minmax,
1702 },
1703 {
1704 .procname = "pipe-user-pages-soft",
1705 .data = &pipe_user_pages_soft,
1706 .maxlen = sizeof(pipe_user_pages_soft),
1707 .mode = 0644,
1708 .proc_handler = proc_doulongvec_minmax,
1709 },
1710 { }
1711 };
1712
1713 static struct ctl_table debug_table[] = {
1714 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1715 {
1716 .procname = "exception-trace",
1717 .data = &show_unhandled_signals,
1718 .maxlen = sizeof(int),
1719 .mode = 0644,
1720 .proc_handler = proc_dointvec
1721 },
1722 #endif
1723 #if defined(CONFIG_OPTPROBES)
1724 {
1725 .procname = "kprobes-optimization",
1726 .data = &sysctl_kprobes_optimization,
1727 .maxlen = sizeof(int),
1728 .mode = 0644,
1729 .proc_handler = proc_kprobes_optimization_handler,
1730 .extra1 = &zero,
1731 .extra2 = &one,
1732 },
1733 #endif
1734 { }
1735 };
1736
1737 static struct ctl_table dev_table[] = {
1738 { }
1739 };
1740
1741 int __init sysctl_init(void)
1742 {
1743 struct ctl_table_header *hdr;
1744
1745 hdr = register_sysctl_table(sysctl_base_table);
1746 kmemleak_not_leak(hdr);
1747 return 0;
1748 }
1749
1750 #endif /* CONFIG_SYSCTL */
1751
1752 /*
1753 * /proc/sys support
1754 */
1755
1756 #ifdef CONFIG_PROC_SYSCTL
1757
1758 static int _proc_do_string(void* data, int maxlen, int write,
1759 void __user *buffer,
1760 size_t *lenp, loff_t *ppos)
1761 {
1762 size_t len;
1763 char __user *p;
1764 char c;
1765
1766 if (!data || !maxlen || !*lenp) {
1767 *lenp = 0;
1768 return 0;
1769 }
1770
1771 if (write) {
1772 len = 0;
1773 p = buffer;
1774 while (len < *lenp) {
1775 if (get_user(c, p++))
1776 return -EFAULT;
1777 if (c == 0 || c == '\n')
1778 break;
1779 len++;
1780 }
1781 if (len >= maxlen)
1782 len = maxlen-1;
1783 if(copy_from_user(data, buffer, len))
1784 return -EFAULT;
1785 ((char *) data)[len] = 0;
1786 *ppos += *lenp;
1787 } else {
1788 len = strlen(data);
1789 if (len > maxlen)
1790 len = maxlen;
1791
1792 if (*ppos > len) {
1793 *lenp = 0;
1794 return 0;
1795 }
1796
1797 data += *ppos;
1798 len -= *ppos;
1799
1800 if (len > *lenp)
1801 len = *lenp;
1802 if (len)
1803 if(copy_to_user(buffer, data, len))
1804 return -EFAULT;
1805 if (len < *lenp) {
1806 if(put_user('\n', ((char __user *) buffer) + len))
1807 return -EFAULT;
1808 len++;
1809 }
1810 *lenp = len;
1811 *ppos += len;
1812 }
1813 return 0;
1814 }
1815
1816 /**
1817 * proc_dostring - read a string sysctl
1818 * @table: the sysctl table
1819 * @write: %TRUE if this is a write to the sysctl file
1820 * @buffer: the user buffer
1821 * @lenp: the size of the user buffer
1822 * @ppos: file position
1823 *
1824 * Reads/writes a string from/to the user buffer. If the kernel
1825 * buffer provided is not large enough to hold the string, the
1826 * string is truncated. The copied string is %NULL-terminated.
1827 * If the string is being read by the user process, it is copied
1828 * and a newline '\n' is added. It is truncated if the buffer is
1829 * not large enough.
1830 *
1831 * Returns 0 on success.
1832 */
1833 int proc_dostring(struct ctl_table *table, int write,
1834 void __user *buffer, size_t *lenp, loff_t *ppos)
1835 {
1836 return _proc_do_string(table->data, table->maxlen, write,
1837 buffer, lenp, ppos);
1838 }
1839
1840 static size_t proc_skip_spaces(char **buf)
1841 {
1842 size_t ret;
1843 char *tmp = skip_spaces(*buf);
1844 ret = tmp - *buf;
1845 *buf = tmp;
1846 return ret;
1847 }
1848
1849 static void proc_skip_char(char **buf, size_t *size, const char v)
1850 {
1851 while (*size) {
1852 if (**buf != v)
1853 break;
1854 (*size)--;
1855 (*buf)++;
1856 }
1857 }
1858
1859 #define TMPBUFLEN 22
1860 /**
1861 * proc_get_long - reads an ASCII formatted integer from a user buffer
1862 *
1863 * @buf: a kernel buffer
1864 * @size: size of the kernel buffer
1865 * @val: this is where the number will be stored
1866 * @neg: set to %TRUE if number is negative
1867 * @perm_tr: a vector which contains the allowed trailers
1868 * @perm_tr_len: size of the perm_tr vector
1869 * @tr: pointer to store the trailer character
1870 *
1871 * In case of success %0 is returned and @buf and @size are updated with
1872 * the amount of bytes read. If @tr is non-NULL and a trailing
1873 * character exists (size is non-zero after returning from this
1874 * function), @tr is updated with the trailing character.
1875 */
1876 static int proc_get_long(char **buf, size_t *size,
1877 unsigned long *val, bool *neg,
1878 const char *perm_tr, unsigned perm_tr_len, char *tr)
1879 {
1880 int len;
1881 char *p, tmp[TMPBUFLEN];
1882
1883 if (!*size)
1884 return -EINVAL;
1885
1886 len = *size;
1887 if (len > TMPBUFLEN - 1)
1888 len = TMPBUFLEN - 1;
1889
1890 memcpy(tmp, *buf, len);
1891
1892 tmp[len] = 0;
1893 p = tmp;
1894 if (*p == '-' && *size > 1) {
1895 *neg = true;
1896 p++;
1897 } else
1898 *neg = false;
1899 if (!isdigit(*p))
1900 return -EINVAL;
1901
1902 *val = simple_strtoul(p, &p, 0);
1903
1904 len = p - tmp;
1905
1906 /* We don't know if the next char is whitespace thus we may accept
1907 * invalid integers (e.g. 1234...a) or two integers instead of one
1908 * (e.g. 123...1). So lets not allow such large numbers. */
1909 if (len == TMPBUFLEN - 1)
1910 return -EINVAL;
1911
1912 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
1913 return -EINVAL;
1914
1915 if (tr && (len < *size))
1916 *tr = *p;
1917
1918 *buf += len;
1919 *size -= len;
1920
1921 return 0;
1922 }
1923
1924 /**
1925 * proc_put_long - converts an integer to a decimal ASCII formatted string
1926 *
1927 * @buf: the user buffer
1928 * @size: the size of the user buffer
1929 * @val: the integer to be converted
1930 * @neg: sign of the number, %TRUE for negative
1931 *
1932 * In case of success %0 is returned and @buf and @size are updated with
1933 * the amount of bytes written.
1934 */
1935 static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
1936 bool neg)
1937 {
1938 int len;
1939 char tmp[TMPBUFLEN], *p = tmp;
1940
1941 sprintf(p, "%s%lu", neg ? "-" : "", val);
1942 len = strlen(tmp);
1943 if (len > *size)
1944 len = *size;
1945 if (copy_to_user(*buf, tmp, len))
1946 return -EFAULT;
1947 *size -= len;
1948 *buf += len;
1949 return 0;
1950 }
1951 #undef TMPBUFLEN
1952
1953 static int proc_put_char(void __user **buf, size_t *size, char c)
1954 {
1955 if (*size) {
1956 char __user **buffer = (char __user **)buf;
1957 if (put_user(c, *buffer))
1958 return -EFAULT;
1959 (*size)--, (*buffer)++;
1960 *buf = *buffer;
1961 }
1962 return 0;
1963 }
1964
1965 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
1966 int *valp,
1967 int write, void *data)
1968 {
1969 if (write) {
1970 *valp = *negp ? -*lvalp : *lvalp;
1971 } else {
1972 int val = *valp;
1973 if (val < 0) {
1974 *negp = true;
1975 *lvalp = (unsigned long)-val;
1976 } else {
1977 *negp = false;
1978 *lvalp = (unsigned long)val;
1979 }
1980 }
1981 return 0;
1982 }
1983
1984 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
1985
1986 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
1987 int write, void __user *buffer,
1988 size_t *lenp, loff_t *ppos,
1989 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
1990 int write, void *data),
1991 void *data)
1992 {
1993 int *i, vleft, first = 1, err = 0;
1994 unsigned long page = 0;
1995 size_t left;
1996 char *kbuf;
1997
1998 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
1999 *lenp = 0;
2000 return 0;
2001 }
2002
2003 i = (int *) tbl_data;
2004 vleft = table->maxlen / sizeof(*i);
2005 left = *lenp;
2006
2007 if (!conv)
2008 conv = do_proc_dointvec_conv;
2009
2010 if (write) {
2011 if (left > PAGE_SIZE - 1)
2012 left = PAGE_SIZE - 1;
2013 page = __get_free_page(GFP_TEMPORARY);
2014 kbuf = (char *) page;
2015 if (!kbuf)
2016 return -ENOMEM;
2017 if (copy_from_user(kbuf, buffer, left)) {
2018 err = -EFAULT;
2019 goto free;
2020 }
2021 kbuf[left] = 0;
2022 }
2023
2024 for (; left && vleft--; i++, first=0) {
2025 unsigned long lval;
2026 bool neg;
2027
2028 if (write) {
2029 left -= proc_skip_spaces(&kbuf);
2030
2031 if (!left)
2032 break;
2033 err = proc_get_long(&kbuf, &left, &lval, &neg,
2034 proc_wspace_sep,
2035 sizeof(proc_wspace_sep), NULL);
2036 if (err)
2037 break;
2038 if (conv(&neg, &lval, i, 1, data)) {
2039 err = -EINVAL;
2040 break;
2041 }
2042 } else {
2043 if (conv(&neg, &lval, i, 0, data)) {
2044 err = -EINVAL;
2045 break;
2046 }
2047 if (!first)
2048 err = proc_put_char(&buffer, &left, '\t');
2049 if (err)
2050 break;
2051 err = proc_put_long(&buffer, &left, lval, neg);
2052 if (err)
2053 break;
2054 }
2055 }
2056
2057 if (!write && !first && left && !err)
2058 err = proc_put_char(&buffer, &left, '\n');
2059 if (write && !err && left)
2060 left -= proc_skip_spaces(&kbuf);
2061 free:
2062 if (write) {
2063 free_page(page);
2064 if (first)
2065 return err ? : -EINVAL;
2066 }
2067 *lenp -= left;
2068 *ppos += *lenp;
2069 return err;
2070 }
2071
2072 static int do_proc_dointvec(struct ctl_table *table, int write,
2073 void __user *buffer, size_t *lenp, loff_t *ppos,
2074 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2075 int write, void *data),
2076 void *data)
2077 {
2078 return __do_proc_dointvec(table->data, table, write,
2079 buffer, lenp, ppos, conv, data);
2080 }
2081
2082 /**
2083 * proc_dointvec - read a vector of integers
2084 * @table: the sysctl table
2085 * @write: %TRUE if this is a write to the sysctl file
2086 * @buffer: the user buffer
2087 * @lenp: the size of the user buffer
2088 * @ppos: file position
2089 *
2090 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2091 * values from/to the user buffer, treated as an ASCII string.
2092 *
2093 * Returns 0 on success.
2094 */
2095 int proc_dointvec(struct ctl_table *table, int write,
2096 void __user *buffer, size_t *lenp, loff_t *ppos)
2097 {
2098 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2099 NULL,NULL);
2100 }
2101
2102 /*
2103 * Taint values can only be increased
2104 * This means we can safely use a temporary.
2105 */
2106 static int proc_taint(struct ctl_table *table, int write,
2107 void __user *buffer, size_t *lenp, loff_t *ppos)
2108 {
2109 struct ctl_table t;
2110 unsigned long tmptaint = get_taint();
2111 int err;
2112
2113 if (write && !capable(CAP_SYS_ADMIN))
2114 return -EPERM;
2115
2116 t = *table;
2117 t.data = &tmptaint;
2118 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2119 if (err < 0)
2120 return err;
2121
2122 if (write) {
2123 /*
2124 * Poor man's atomic or. Not worth adding a primitive
2125 * to everyone's atomic.h for this
2126 */
2127 int i;
2128 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2129 if ((tmptaint >> i) & 1)
2130 add_taint(i, LOCKDEP_STILL_OK);
2131 }
2132 }
2133
2134 return err;
2135 }
2136
2137 #ifdef CONFIG_PRINTK
2138 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
2139 void __user *buffer, size_t *lenp, loff_t *ppos)
2140 {
2141 if (write && !capable(CAP_SYS_ADMIN))
2142 return -EPERM;
2143
2144 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2145 }
2146 #endif
2147
2148 struct do_proc_dointvec_minmax_conv_param {
2149 int *min;
2150 int *max;
2151 };
2152
2153 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2154 int *valp,
2155 int write, void *data)
2156 {
2157 struct do_proc_dointvec_minmax_conv_param *param = data;
2158 if (write) {
2159 int val = *negp ? -*lvalp : *lvalp;
2160 if ((param->min && *param->min > val) ||
2161 (param->max && *param->max < val))
2162 return -EINVAL;
2163 *valp = val;
2164 } else {
2165 int val = *valp;
2166 if (val < 0) {
2167 *negp = true;
2168 *lvalp = (unsigned long)-val;
2169 } else {
2170 *negp = false;
2171 *lvalp = (unsigned long)val;
2172 }
2173 }
2174 return 0;
2175 }
2176
2177 /**
2178 * proc_dointvec_minmax - read a vector of integers with min/max values
2179 * @table: the sysctl table
2180 * @write: %TRUE if this is a write to the sysctl file
2181 * @buffer: the user buffer
2182 * @lenp: the size of the user buffer
2183 * @ppos: file position
2184 *
2185 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2186 * values from/to the user buffer, treated as an ASCII string.
2187 *
2188 * This routine will ensure the values are within the range specified by
2189 * table->extra1 (min) and table->extra2 (max).
2190 *
2191 * Returns 0 on success.
2192 */
2193 int proc_dointvec_minmax(struct ctl_table *table, int write,
2194 void __user *buffer, size_t *lenp, loff_t *ppos)
2195 {
2196 struct do_proc_dointvec_minmax_conv_param param = {
2197 .min = (int *) table->extra1,
2198 .max = (int *) table->extra2,
2199 };
2200 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2201 do_proc_dointvec_minmax_conv, &param);
2202 }
2203
2204 static void validate_coredump_safety(void)
2205 {
2206 #ifdef CONFIG_COREDUMP
2207 if (suid_dumpable == SUID_DUMP_ROOT &&
2208 core_pattern[0] != '/' && core_pattern[0] != '|') {
2209 printk(KERN_WARNING "Unsafe core_pattern used with "\
2210 "suid_dumpable=2. Pipe handler or fully qualified "\
2211 "core dump path required.\n");
2212 }
2213 #endif
2214 }
2215
2216 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2217 void __user *buffer, size_t *lenp, loff_t *ppos)
2218 {
2219 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2220 if (!error)
2221 validate_coredump_safety();
2222 return error;
2223 }
2224
2225 #ifdef CONFIG_COREDUMP
2226 static int proc_dostring_coredump(struct ctl_table *table, int write,
2227 void __user *buffer, size_t *lenp, loff_t *ppos)
2228 {
2229 int error = proc_dostring(table, write, buffer, lenp, ppos);
2230 if (!error)
2231 validate_coredump_safety();
2232 return error;
2233 }
2234 #endif
2235
2236 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2237 void __user *buffer,
2238 size_t *lenp, loff_t *ppos,
2239 unsigned long convmul,
2240 unsigned long convdiv)
2241 {
2242 unsigned long *i, *min, *max;
2243 int vleft, first = 1, err = 0;
2244 unsigned long page = 0;
2245 size_t left;
2246 char *kbuf;
2247
2248 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2249 *lenp = 0;
2250 return 0;
2251 }
2252
2253 i = (unsigned long *) data;
2254 min = (unsigned long *) table->extra1;
2255 max = (unsigned long *) table->extra2;
2256 vleft = table->maxlen / sizeof(unsigned long);
2257 left = *lenp;
2258
2259 if (write) {
2260 if (left > PAGE_SIZE - 1)
2261 left = PAGE_SIZE - 1;
2262 page = __get_free_page(GFP_TEMPORARY);
2263 kbuf = (char *) page;
2264 if (!kbuf)
2265 return -ENOMEM;
2266 if (copy_from_user(kbuf, buffer, left)) {
2267 err = -EFAULT;
2268 goto free;
2269 }
2270 kbuf[left] = 0;
2271 }
2272
2273 for (; left && vleft--; i++, first = 0) {
2274 unsigned long val;
2275
2276 if (write) {
2277 bool neg;
2278
2279 left -= proc_skip_spaces(&kbuf);
2280
2281 err = proc_get_long(&kbuf, &left, &val, &neg,
2282 proc_wspace_sep,
2283 sizeof(proc_wspace_sep), NULL);
2284 if (err)
2285 break;
2286 if (neg)
2287 continue;
2288 val = convmul * val / convdiv;
2289 if ((min && val < *min) || (max && val > *max))
2290 continue;
2291 *i = val;
2292 } else {
2293 val = convdiv * (*i) / convmul;
2294 if (!first)
2295 err = proc_put_char(&buffer, &left, '\t');
2296 err = proc_put_long(&buffer, &left, val, false);
2297 if (err)
2298 break;
2299 }
2300 }
2301
2302 if (!write && !first && left && !err)
2303 err = proc_put_char(&buffer, &left, '\n');
2304 if (write && !err)
2305 left -= proc_skip_spaces(&kbuf);
2306 free:
2307 if (write) {
2308 free_page(page);
2309 if (first)
2310 return err ? : -EINVAL;
2311 }
2312 *lenp -= left;
2313 *ppos += *lenp;
2314 return err;
2315 }
2316
2317 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2318 void __user *buffer,
2319 size_t *lenp, loff_t *ppos,
2320 unsigned long convmul,
2321 unsigned long convdiv)
2322 {
2323 return __do_proc_doulongvec_minmax(table->data, table, write,
2324 buffer, lenp, ppos, convmul, convdiv);
2325 }
2326
2327 /**
2328 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2329 * @table: the sysctl table
2330 * @write: %TRUE if this is a write to the sysctl file
2331 * @buffer: the user buffer
2332 * @lenp: the size of the user buffer
2333 * @ppos: file position
2334 *
2335 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2336 * values from/to the user buffer, treated as an ASCII string.
2337 *
2338 * This routine will ensure the values are within the range specified by
2339 * table->extra1 (min) and table->extra2 (max).
2340 *
2341 * Returns 0 on success.
2342 */
2343 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2344 void __user *buffer, size_t *lenp, loff_t *ppos)
2345 {
2346 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2347 }
2348
2349 /**
2350 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2351 * @table: the sysctl table
2352 * @write: %TRUE if this is a write to the sysctl file
2353 * @buffer: the user buffer
2354 * @lenp: the size of the user buffer
2355 * @ppos: file position
2356 *
2357 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2358 * values from/to the user buffer, treated as an ASCII string. The values
2359 * are treated as milliseconds, and converted to jiffies when they are stored.
2360 *
2361 * This routine will ensure the values are within the range specified by
2362 * table->extra1 (min) and table->extra2 (max).
2363 *
2364 * Returns 0 on success.
2365 */
2366 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2367 void __user *buffer,
2368 size_t *lenp, loff_t *ppos)
2369 {
2370 return do_proc_doulongvec_minmax(table, write, buffer,
2371 lenp, ppos, HZ, 1000l);
2372 }
2373
2374
2375 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2376 int *valp,
2377 int write, void *data)
2378 {
2379 if (write) {
2380 if (*lvalp > LONG_MAX / HZ)
2381 return 1;
2382 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2383 } else {
2384 int val = *valp;
2385 unsigned long lval;
2386 if (val < 0) {
2387 *negp = true;
2388 lval = (unsigned long)-val;
2389 } else {
2390 *negp = false;
2391 lval = (unsigned long)val;
2392 }
2393 *lvalp = lval / HZ;
2394 }
2395 return 0;
2396 }
2397
2398 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2399 int *valp,
2400 int write, void *data)
2401 {
2402 if (write) {
2403 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2404 return 1;
2405 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2406 } else {
2407 int val = *valp;
2408 unsigned long lval;
2409 if (val < 0) {
2410 *negp = true;
2411 lval = (unsigned long)-val;
2412 } else {
2413 *negp = false;
2414 lval = (unsigned long)val;
2415 }
2416 *lvalp = jiffies_to_clock_t(lval);
2417 }
2418 return 0;
2419 }
2420
2421 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2422 int *valp,
2423 int write, void *data)
2424 {
2425 if (write) {
2426 *valp = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2427 } else {
2428 int val = *valp;
2429 unsigned long lval;
2430 if (val < 0) {
2431 *negp = true;
2432 lval = (unsigned long)-val;
2433 } else {
2434 *negp = false;
2435 lval = (unsigned long)val;
2436 }
2437 *lvalp = jiffies_to_msecs(lval);
2438 }
2439 return 0;
2440 }
2441
2442 /**
2443 * proc_dointvec_jiffies - read a vector of integers as seconds
2444 * @table: the sysctl table
2445 * @write: %TRUE if this is a write to the sysctl file
2446 * @buffer: the user buffer
2447 * @lenp: the size of the user buffer
2448 * @ppos: file position
2449 *
2450 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2451 * values from/to the user buffer, treated as an ASCII string.
2452 * The values read are assumed to be in seconds, and are converted into
2453 * jiffies.
2454 *
2455 * Returns 0 on success.
2456 */
2457 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2458 void __user *buffer, size_t *lenp, loff_t *ppos)
2459 {
2460 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2461 do_proc_dointvec_jiffies_conv,NULL);
2462 }
2463
2464 /**
2465 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2466 * @table: the sysctl table
2467 * @write: %TRUE if this is a write to the sysctl file
2468 * @buffer: the user buffer
2469 * @lenp: the size of the user buffer
2470 * @ppos: pointer to the file position
2471 *
2472 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2473 * values from/to the user buffer, treated as an ASCII string.
2474 * The values read are assumed to be in 1/USER_HZ seconds, and
2475 * are converted into jiffies.
2476 *
2477 * Returns 0 on success.
2478 */
2479 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2480 void __user *buffer, size_t *lenp, loff_t *ppos)
2481 {
2482 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2483 do_proc_dointvec_userhz_jiffies_conv,NULL);
2484 }
2485
2486 /**
2487 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2488 * @table: the sysctl table
2489 * @write: %TRUE if this is a write to the sysctl file
2490 * @buffer: the user buffer
2491 * @lenp: the size of the user buffer
2492 * @ppos: file position
2493 * @ppos: the current position in the file
2494 *
2495 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2496 * values from/to the user buffer, treated as an ASCII string.
2497 * The values read are assumed to be in 1/1000 seconds, and
2498 * are converted into jiffies.
2499 *
2500 * Returns 0 on success.
2501 */
2502 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2503 void __user *buffer, size_t *lenp, loff_t *ppos)
2504 {
2505 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2506 do_proc_dointvec_ms_jiffies_conv, NULL);
2507 }
2508
2509 static int proc_do_cad_pid(struct ctl_table *table, int write,
2510 void __user *buffer, size_t *lenp, loff_t *ppos)
2511 {
2512 struct pid *new_pid;
2513 pid_t tmp;
2514 int r;
2515
2516 tmp = pid_vnr(cad_pid);
2517
2518 r = __do_proc_dointvec(&tmp, table, write, buffer,
2519 lenp, ppos, NULL, NULL);
2520 if (r || !write)
2521 return r;
2522
2523 new_pid = find_get_pid(tmp);
2524 if (!new_pid)
2525 return -ESRCH;
2526
2527 put_pid(xchg(&cad_pid, new_pid));
2528 return 0;
2529 }
2530
2531 /**
2532 * proc_do_large_bitmap - read/write from/to a large bitmap
2533 * @table: the sysctl table
2534 * @write: %TRUE if this is a write to the sysctl file
2535 * @buffer: the user buffer
2536 * @lenp: the size of the user buffer
2537 * @ppos: file position
2538 *
2539 * The bitmap is stored at table->data and the bitmap length (in bits)
2540 * in table->maxlen.
2541 *
2542 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
2543 * large bitmaps may be represented in a compact manner. Writing into
2544 * the file will clear the bitmap then update it with the given input.
2545 *
2546 * Returns 0 on success.
2547 */
2548 int proc_do_large_bitmap(struct ctl_table *table, int write,
2549 void __user *buffer, size_t *lenp, loff_t *ppos)
2550 {
2551 int err = 0;
2552 bool first = 1;
2553 size_t left = *lenp;
2554 unsigned long bitmap_len = table->maxlen;
2555 unsigned long *bitmap = (unsigned long *) table->data;
2556 unsigned long *tmp_bitmap = NULL;
2557 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
2558
2559 if (!bitmap_len || !left || (*ppos && !write)) {
2560 *lenp = 0;
2561 return 0;
2562 }
2563
2564 if (write) {
2565 unsigned long page = 0;
2566 char *kbuf;
2567
2568 if (left > PAGE_SIZE - 1)
2569 left = PAGE_SIZE - 1;
2570
2571 page = __get_free_page(GFP_TEMPORARY);
2572 kbuf = (char *) page;
2573 if (!kbuf)
2574 return -ENOMEM;
2575 if (copy_from_user(kbuf, buffer, left)) {
2576 free_page(page);
2577 return -EFAULT;
2578 }
2579 kbuf[left] = 0;
2580
2581 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
2582 GFP_KERNEL);
2583 if (!tmp_bitmap) {
2584 free_page(page);
2585 return -ENOMEM;
2586 }
2587 proc_skip_char(&kbuf, &left, '\n');
2588 while (!err && left) {
2589 unsigned long val_a, val_b;
2590 bool neg;
2591
2592 err = proc_get_long(&kbuf, &left, &val_a, &neg, tr_a,
2593 sizeof(tr_a), &c);
2594 if (err)
2595 break;
2596 if (val_a >= bitmap_len || neg) {
2597 err = -EINVAL;
2598 break;
2599 }
2600
2601 val_b = val_a;
2602 if (left) {
2603 kbuf++;
2604 left--;
2605 }
2606
2607 if (c == '-') {
2608 err = proc_get_long(&kbuf, &left, &val_b,
2609 &neg, tr_b, sizeof(tr_b),
2610 &c);
2611 if (err)
2612 break;
2613 if (val_b >= bitmap_len || neg ||
2614 val_a > val_b) {
2615 err = -EINVAL;
2616 break;
2617 }
2618 if (left) {
2619 kbuf++;
2620 left--;
2621 }
2622 }
2623
2624 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
2625 first = 0;
2626 proc_skip_char(&kbuf, &left, '\n');
2627 }
2628 free_page(page);
2629 } else {
2630 unsigned long bit_a, bit_b = 0;
2631
2632 while (left) {
2633 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
2634 if (bit_a >= bitmap_len)
2635 break;
2636 bit_b = find_next_zero_bit(bitmap, bitmap_len,
2637 bit_a + 1) - 1;
2638
2639 if (!first) {
2640 err = proc_put_char(&buffer, &left, ',');
2641 if (err)
2642 break;
2643 }
2644 err = proc_put_long(&buffer, &left, bit_a, false);
2645 if (err)
2646 break;
2647 if (bit_a != bit_b) {
2648 err = proc_put_char(&buffer, &left, '-');
2649 if (err)
2650 break;
2651 err = proc_put_long(&buffer, &left, bit_b, false);
2652 if (err)
2653 break;
2654 }
2655
2656 first = 0; bit_b++;
2657 }
2658 if (!err)
2659 err = proc_put_char(&buffer, &left, '\n');
2660 }
2661
2662 if (!err) {
2663 if (write) {
2664 if (*ppos)
2665 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
2666 else
2667 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
2668 }
2669 kfree(tmp_bitmap);
2670 *lenp -= left;
2671 *ppos += *lenp;
2672 return 0;
2673 } else {
2674 kfree(tmp_bitmap);
2675 return err;
2676 }
2677 }
2678
2679 #else /* CONFIG_PROC_SYSCTL */
2680
2681 int proc_dostring(struct ctl_table *table, int write,
2682 void __user *buffer, size_t *lenp, loff_t *ppos)
2683 {
2684 return -ENOSYS;
2685 }
2686
2687 int proc_dointvec(struct ctl_table *table, int write,
2688 void __user *buffer, size_t *lenp, loff_t *ppos)
2689 {
2690 return -ENOSYS;
2691 }
2692
2693 int proc_dointvec_minmax(struct ctl_table *table, int write,
2694 void __user *buffer, size_t *lenp, loff_t *ppos)
2695 {
2696 return -ENOSYS;
2697 }
2698
2699 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2700 void __user *buffer, size_t *lenp, loff_t *ppos)
2701 {
2702 return -ENOSYS;
2703 }
2704
2705 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2706 void __user *buffer, size_t *lenp, loff_t *ppos)
2707 {
2708 return -ENOSYS;
2709 }
2710
2711 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2712 void __user *buffer, size_t *lenp, loff_t *ppos)
2713 {
2714 return -ENOSYS;
2715 }
2716
2717 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2718 void __user *buffer, size_t *lenp, loff_t *ppos)
2719 {
2720 return -ENOSYS;
2721 }
2722
2723 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2724 void __user *buffer,
2725 size_t *lenp, loff_t *ppos)
2726 {
2727 return -ENOSYS;
2728 }
2729
2730
2731 #endif /* CONFIG_PROC_SYSCTL */
2732
2733 /*
2734 * No sense putting this after each symbol definition, twice,
2735 * exception granted :-)
2736 */
2737 EXPORT_SYMBOL(proc_dointvec);
2738 EXPORT_SYMBOL(proc_dointvec_jiffies);
2739 EXPORT_SYMBOL(proc_dointvec_minmax);
2740 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2741 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2742 EXPORT_SYMBOL(proc_dostring);
2743 EXPORT_SYMBOL(proc_doulongvec_minmax);
2744 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);