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Merge 4.14.7 into android-4.14
[GitHub/moto-9609/android_kernel_motorola_exynos9610.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/sched/coredump.h>
67 #include <linux/kexec.h>
68 #include <linux/bpf.h>
69 #include <linux/mount.h>
70
71 #include <linux/uaccess.h>
72 #include <asm/processor.h>
73
74 #ifdef CONFIG_X86
75 #include <asm/nmi.h>
76 #include <asm/stacktrace.h>
77 #include <asm/io.h>
78 #endif
79 #ifdef CONFIG_SPARC
80 #include <asm/setup.h>
81 #endif
82 #ifdef CONFIG_BSD_PROCESS_ACCT
83 #include <linux/acct.h>
84 #endif
85 #ifdef CONFIG_RT_MUTEXES
86 #include <linux/rtmutex.h>
87 #endif
88 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
89 #include <linux/lockdep.h>
90 #endif
91 #ifdef CONFIG_CHR_DEV_SG
92 #include <scsi/sg.h>
93 #endif
94
95 #ifdef CONFIG_LOCKUP_DETECTOR
96 #include <linux/nmi.h>
97 #endif
98
99 #if defined(CONFIG_SYSCTL)
100
101 /* External variables not in a header file. */
102 extern int suid_dumpable;
103 #ifdef CONFIG_COREDUMP
104 extern int core_uses_pid;
105 extern char core_pattern[];
106 extern unsigned int core_pipe_limit;
107 #endif
108 extern int pid_max;
109 extern int pid_max_min, pid_max_max;
110 extern int percpu_pagelist_fraction;
111 extern int latencytop_enabled;
112 extern unsigned int sysctl_nr_open_min, sysctl_nr_open_max;
113 #ifndef CONFIG_MMU
114 extern int sysctl_nr_trim_pages;
115 #endif
116
117 /* Constants used for minimum and maximum */
118 #ifdef CONFIG_LOCKUP_DETECTOR
119 static int sixty = 60;
120 #endif
121
122 static int __maybe_unused neg_one = -1;
123
124 static int zero;
125 static int __maybe_unused one = 1;
126 static int __maybe_unused two = 2;
127 static int __maybe_unused four = 4;
128 static unsigned long one_ul = 1;
129 static int one_hundred = 100;
130 static int one_thousand = 1000;
131 #ifdef CONFIG_PRINTK
132 static int ten_thousand = 10000;
133 #endif
134 #ifdef CONFIG_PERF_EVENTS
135 static int six_hundred_forty_kb = 640 * 1024;
136 #endif
137
138 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
139 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
140
141 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
142 static int maxolduid = 65535;
143 static int minolduid;
144
145 static int ngroups_max = NGROUPS_MAX;
146 static const int cap_last_cap = CAP_LAST_CAP;
147
148 /*this is needed for proc_doulongvec_minmax of sysctl_hung_task_timeout_secs */
149 #ifdef CONFIG_DETECT_HUNG_TASK
150 static unsigned long hung_task_timeout_max = (LONG_MAX/HZ);
151 #endif
152
153 #ifdef CONFIG_INOTIFY_USER
154 #include <linux/inotify.h>
155 #endif
156 #ifdef CONFIG_SPARC
157 #endif
158
159 #ifdef __hppa__
160 extern int pwrsw_enabled;
161 #endif
162
163 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
164 extern int unaligned_enabled;
165 #endif
166
167 #ifdef CONFIG_IA64
168 extern int unaligned_dump_stack;
169 #endif
170
171 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
172 extern int no_unaligned_warning;
173 #endif
174
175 #ifdef CONFIG_PROC_SYSCTL
176
177 /**
178 * enum sysctl_writes_mode - supported sysctl write modes
179 *
180 * @SYSCTL_WRITES_LEGACY: each write syscall must fully contain the sysctl value
181 * to be written, and multiple writes on the same sysctl file descriptor
182 * will rewrite the sysctl value, regardless of file position. No warning
183 * is issued when the initial position is not 0.
184 * @SYSCTL_WRITES_WARN: same as above but warn when the initial file position is
185 * not 0.
186 * @SYSCTL_WRITES_STRICT: writes to numeric sysctl entries must always be at
187 * file position 0 and the value must be fully contained in the buffer
188 * sent to the write syscall. If dealing with strings respect the file
189 * position, but restrict this to the max length of the buffer, anything
190 * passed the max lenght will be ignored. Multiple writes will append
191 * to the buffer.
192 *
193 * These write modes control how current file position affects the behavior of
194 * updating sysctl values through the proc interface on each write.
195 */
196 enum sysctl_writes_mode {
197 SYSCTL_WRITES_LEGACY = -1,
198 SYSCTL_WRITES_WARN = 0,
199 SYSCTL_WRITES_STRICT = 1,
200 };
201
202 static enum sysctl_writes_mode sysctl_writes_strict = SYSCTL_WRITES_STRICT;
203
204 static int proc_do_cad_pid(struct ctl_table *table, int write,
205 void __user *buffer, size_t *lenp, loff_t *ppos);
206 static int proc_taint(struct ctl_table *table, int write,
207 void __user *buffer, size_t *lenp, loff_t *ppos);
208 #endif
209
210 #ifdef CONFIG_PRINTK
211 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
212 void __user *buffer, size_t *lenp, loff_t *ppos);
213 #endif
214
215 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
216 void __user *buffer, size_t *lenp, loff_t *ppos);
217 #ifdef CONFIG_COREDUMP
218 static int proc_dostring_coredump(struct ctl_table *table, int write,
219 void __user *buffer, size_t *lenp, loff_t *ppos);
220 #endif
221
222 #ifdef CONFIG_MAGIC_SYSRQ
223 /* Note: sysrq code uses it's own private copy */
224 static int __sysrq_enabled = CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE;
225
226 static int sysrq_sysctl_handler(struct ctl_table *table, int write,
227 void __user *buffer, size_t *lenp,
228 loff_t *ppos)
229 {
230 int error;
231
232 error = proc_dointvec(table, write, buffer, lenp, ppos);
233 if (error)
234 return error;
235
236 if (write)
237 sysrq_toggle_support(__sysrq_enabled);
238
239 return 0;
240 }
241
242 #endif
243
244 static struct ctl_table kern_table[];
245 static struct ctl_table vm_table[];
246 static struct ctl_table fs_table[];
247 static struct ctl_table debug_table[];
248 static struct ctl_table dev_table[];
249 extern struct ctl_table random_table[];
250 #ifdef CONFIG_EPOLL
251 extern struct ctl_table epoll_table[];
252 #endif
253
254 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
255 int sysctl_legacy_va_layout;
256 #endif
257
258 /* The default sysctl tables: */
259
260 static struct ctl_table sysctl_base_table[] = {
261 {
262 .procname = "kernel",
263 .mode = 0555,
264 .child = kern_table,
265 },
266 {
267 .procname = "vm",
268 .mode = 0555,
269 .child = vm_table,
270 },
271 {
272 .procname = "fs",
273 .mode = 0555,
274 .child = fs_table,
275 },
276 {
277 .procname = "debug",
278 .mode = 0555,
279 .child = debug_table,
280 },
281 {
282 .procname = "dev",
283 .mode = 0555,
284 .child = dev_table,
285 },
286 { }
287 };
288
289 #ifdef CONFIG_SCHED_DEBUG
290 static int min_sched_granularity_ns = 100000; /* 100 usecs */
291 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
292 static int min_wakeup_granularity_ns; /* 0 usecs */
293 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
294 #ifdef CONFIG_SMP
295 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
296 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
297 #endif /* CONFIG_SMP */
298 #endif /* CONFIG_SCHED_DEBUG */
299
300 #ifdef CONFIG_COMPACTION
301 static int min_extfrag_threshold;
302 static int max_extfrag_threshold = 1000;
303 #endif
304
305 static struct ctl_table kern_table[] = {
306 {
307 .procname = "sched_child_runs_first",
308 .data = &sysctl_sched_child_runs_first,
309 .maxlen = sizeof(unsigned int),
310 .mode = 0644,
311 .proc_handler = proc_dointvec,
312 },
313 #ifdef CONFIG_SCHED_DEBUG
314 {
315 .procname = "sched_min_granularity_ns",
316 .data = &sysctl_sched_min_granularity,
317 .maxlen = sizeof(unsigned int),
318 .mode = 0644,
319 .proc_handler = sched_proc_update_handler,
320 .extra1 = &min_sched_granularity_ns,
321 .extra2 = &max_sched_granularity_ns,
322 },
323 {
324 .procname = "sched_latency_ns",
325 .data = &sysctl_sched_latency,
326 .maxlen = sizeof(unsigned int),
327 .mode = 0644,
328 .proc_handler = sched_proc_update_handler,
329 .extra1 = &min_sched_granularity_ns,
330 .extra2 = &max_sched_granularity_ns,
331 },
332 #ifdef CONFIG_SCHED_WALT
333 {
334 .procname = "sched_use_walt_cpu_util",
335 .data = &sysctl_sched_use_walt_cpu_util,
336 .maxlen = sizeof(unsigned int),
337 .mode = 0644,
338 .proc_handler = proc_dointvec,
339 },
340 {
341 .procname = "sched_use_walt_task_util",
342 .data = &sysctl_sched_use_walt_task_util,
343 .maxlen = sizeof(unsigned int),
344 .mode = 0644,
345 .proc_handler = proc_dointvec,
346 },
347 {
348 .procname = "sched_walt_init_task_load_pct",
349 .data = &sysctl_sched_walt_init_task_load_pct,
350 .maxlen = sizeof(unsigned int),
351 .mode = 0644,
352 .proc_handler = proc_dointvec,
353 },
354 {
355 .procname = "sched_walt_cpu_high_irqload",
356 .data = &sysctl_sched_walt_cpu_high_irqload,
357 .maxlen = sizeof(unsigned int),
358 .mode = 0644,
359 .proc_handler = proc_dointvec,
360 },
361 #endif
362 {
363 .procname = "sched_sync_hint_enable",
364 .data = &sysctl_sched_sync_hint_enable,
365 .maxlen = sizeof(unsigned int),
366 .mode = 0644,
367 .proc_handler = proc_dointvec,
368 },
369 {
370 .procname = "sched_cstate_aware",
371 .data = &sysctl_sched_cstate_aware,
372 .maxlen = sizeof(unsigned int),
373 .mode = 0644,
374 .proc_handler = proc_dointvec,
375 },
376 {
377 .procname = "sched_wakeup_granularity_ns",
378 .data = &sysctl_sched_wakeup_granularity,
379 .maxlen = sizeof(unsigned int),
380 .mode = 0644,
381 .proc_handler = sched_proc_update_handler,
382 .extra1 = &min_wakeup_granularity_ns,
383 .extra2 = &max_wakeup_granularity_ns,
384 },
385 #ifdef CONFIG_SMP
386 {
387 .procname = "sched_tunable_scaling",
388 .data = &sysctl_sched_tunable_scaling,
389 .maxlen = sizeof(enum sched_tunable_scaling),
390 .mode = 0644,
391 .proc_handler = sched_proc_update_handler,
392 .extra1 = &min_sched_tunable_scaling,
393 .extra2 = &max_sched_tunable_scaling,
394 },
395 {
396 .procname = "sched_migration_cost_ns",
397 .data = &sysctl_sched_migration_cost,
398 .maxlen = sizeof(unsigned int),
399 .mode = 0644,
400 .proc_handler = proc_dointvec,
401 },
402 {
403 .procname = "sched_nr_migrate",
404 .data = &sysctl_sched_nr_migrate,
405 .maxlen = sizeof(unsigned int),
406 .mode = 0644,
407 .proc_handler = proc_dointvec,
408 },
409 {
410 .procname = "sched_time_avg_ms",
411 .data = &sysctl_sched_time_avg,
412 .maxlen = sizeof(unsigned int),
413 .mode = 0644,
414 .proc_handler = proc_dointvec_minmax,
415 .extra1 = &one,
416 },
417 #ifdef CONFIG_SCHEDSTATS
418 {
419 .procname = "sched_schedstats",
420 .data = NULL,
421 .maxlen = sizeof(unsigned int),
422 .mode = 0644,
423 .proc_handler = sysctl_schedstats,
424 .extra1 = &zero,
425 .extra2 = &one,
426 },
427 #endif /* CONFIG_SCHEDSTATS */
428 #endif /* CONFIG_SMP */
429 #ifdef CONFIG_NUMA_BALANCING
430 {
431 .procname = "numa_balancing_scan_delay_ms",
432 .data = &sysctl_numa_balancing_scan_delay,
433 .maxlen = sizeof(unsigned int),
434 .mode = 0644,
435 .proc_handler = proc_dointvec,
436 },
437 {
438 .procname = "numa_balancing_scan_period_min_ms",
439 .data = &sysctl_numa_balancing_scan_period_min,
440 .maxlen = sizeof(unsigned int),
441 .mode = 0644,
442 .proc_handler = proc_dointvec,
443 },
444 {
445 .procname = "numa_balancing_scan_period_max_ms",
446 .data = &sysctl_numa_balancing_scan_period_max,
447 .maxlen = sizeof(unsigned int),
448 .mode = 0644,
449 .proc_handler = proc_dointvec,
450 },
451 {
452 .procname = "numa_balancing_scan_size_mb",
453 .data = &sysctl_numa_balancing_scan_size,
454 .maxlen = sizeof(unsigned int),
455 .mode = 0644,
456 .proc_handler = proc_dointvec_minmax,
457 .extra1 = &one,
458 },
459 {
460 .procname = "numa_balancing",
461 .data = NULL, /* filled in by handler */
462 .maxlen = sizeof(unsigned int),
463 .mode = 0644,
464 .proc_handler = sysctl_numa_balancing,
465 .extra1 = &zero,
466 .extra2 = &one,
467 },
468 #endif /* CONFIG_NUMA_BALANCING */
469 #endif /* CONFIG_SCHED_DEBUG */
470 {
471 .procname = "sched_rt_period_us",
472 .data = &sysctl_sched_rt_period,
473 .maxlen = sizeof(unsigned int),
474 .mode = 0644,
475 .proc_handler = sched_rt_handler,
476 },
477 {
478 .procname = "sched_rt_runtime_us",
479 .data = &sysctl_sched_rt_runtime,
480 .maxlen = sizeof(int),
481 .mode = 0644,
482 .proc_handler = sched_rt_handler,
483 },
484 {
485 .procname = "sched_rr_timeslice_ms",
486 .data = &sysctl_sched_rr_timeslice,
487 .maxlen = sizeof(int),
488 .mode = 0644,
489 .proc_handler = sched_rr_handler,
490 },
491 #ifdef CONFIG_SCHED_AUTOGROUP
492 {
493 .procname = "sched_autogroup_enabled",
494 .data = &sysctl_sched_autogroup_enabled,
495 .maxlen = sizeof(unsigned int),
496 .mode = 0644,
497 .proc_handler = proc_dointvec_minmax,
498 .extra1 = &zero,
499 .extra2 = &one,
500 },
501 #endif
502 #ifdef CONFIG_CFS_BANDWIDTH
503 {
504 .procname = "sched_cfs_bandwidth_slice_us",
505 .data = &sysctl_sched_cfs_bandwidth_slice,
506 .maxlen = sizeof(unsigned int),
507 .mode = 0644,
508 .proc_handler = proc_dointvec_minmax,
509 .extra1 = &one,
510 },
511 #endif
512 #ifdef CONFIG_PROVE_LOCKING
513 {
514 .procname = "prove_locking",
515 .data = &prove_locking,
516 .maxlen = sizeof(int),
517 .mode = 0644,
518 .proc_handler = proc_dointvec,
519 },
520 #endif
521 #ifdef CONFIG_LOCK_STAT
522 {
523 .procname = "lock_stat",
524 .data = &lock_stat,
525 .maxlen = sizeof(int),
526 .mode = 0644,
527 .proc_handler = proc_dointvec,
528 },
529 #endif
530 {
531 .procname = "panic",
532 .data = &panic_timeout,
533 .maxlen = sizeof(int),
534 .mode = 0644,
535 .proc_handler = proc_dointvec,
536 },
537 #ifdef CONFIG_COREDUMP
538 {
539 .procname = "core_uses_pid",
540 .data = &core_uses_pid,
541 .maxlen = sizeof(int),
542 .mode = 0644,
543 .proc_handler = proc_dointvec,
544 },
545 {
546 .procname = "core_pattern",
547 .data = core_pattern,
548 .maxlen = CORENAME_MAX_SIZE,
549 .mode = 0644,
550 .proc_handler = proc_dostring_coredump,
551 },
552 {
553 .procname = "core_pipe_limit",
554 .data = &core_pipe_limit,
555 .maxlen = sizeof(unsigned int),
556 .mode = 0644,
557 .proc_handler = proc_dointvec,
558 },
559 #endif
560 #ifdef CONFIG_PROC_SYSCTL
561 {
562 .procname = "tainted",
563 .maxlen = sizeof(long),
564 .mode = 0644,
565 .proc_handler = proc_taint,
566 },
567 {
568 .procname = "sysctl_writes_strict",
569 .data = &sysctl_writes_strict,
570 .maxlen = sizeof(int),
571 .mode = 0644,
572 .proc_handler = proc_dointvec_minmax,
573 .extra1 = &neg_one,
574 .extra2 = &one,
575 },
576 #endif
577 #ifdef CONFIG_LATENCYTOP
578 {
579 .procname = "latencytop",
580 .data = &latencytop_enabled,
581 .maxlen = sizeof(int),
582 .mode = 0644,
583 .proc_handler = sysctl_latencytop,
584 },
585 #endif
586 #ifdef CONFIG_BLK_DEV_INITRD
587 {
588 .procname = "real-root-dev",
589 .data = &real_root_dev,
590 .maxlen = sizeof(int),
591 .mode = 0644,
592 .proc_handler = proc_dointvec,
593 },
594 #endif
595 {
596 .procname = "print-fatal-signals",
597 .data = &print_fatal_signals,
598 .maxlen = sizeof(int),
599 .mode = 0644,
600 .proc_handler = proc_dointvec,
601 },
602 #ifdef CONFIG_SPARC
603 {
604 .procname = "reboot-cmd",
605 .data = reboot_command,
606 .maxlen = 256,
607 .mode = 0644,
608 .proc_handler = proc_dostring,
609 },
610 {
611 .procname = "stop-a",
612 .data = &stop_a_enabled,
613 .maxlen = sizeof (int),
614 .mode = 0644,
615 .proc_handler = proc_dointvec,
616 },
617 {
618 .procname = "scons-poweroff",
619 .data = &scons_pwroff,
620 .maxlen = sizeof (int),
621 .mode = 0644,
622 .proc_handler = proc_dointvec,
623 },
624 #endif
625 #ifdef CONFIG_SPARC64
626 {
627 .procname = "tsb-ratio",
628 .data = &sysctl_tsb_ratio,
629 .maxlen = sizeof (int),
630 .mode = 0644,
631 .proc_handler = proc_dointvec,
632 },
633 #endif
634 #ifdef __hppa__
635 {
636 .procname = "soft-power",
637 .data = &pwrsw_enabled,
638 .maxlen = sizeof (int),
639 .mode = 0644,
640 .proc_handler = proc_dointvec,
641 },
642 #endif
643 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
644 {
645 .procname = "unaligned-trap",
646 .data = &unaligned_enabled,
647 .maxlen = sizeof (int),
648 .mode = 0644,
649 .proc_handler = proc_dointvec,
650 },
651 #endif
652 {
653 .procname = "ctrl-alt-del",
654 .data = &C_A_D,
655 .maxlen = sizeof(int),
656 .mode = 0644,
657 .proc_handler = proc_dointvec,
658 },
659 #ifdef CONFIG_FUNCTION_TRACER
660 {
661 .procname = "ftrace_enabled",
662 .data = &ftrace_enabled,
663 .maxlen = sizeof(int),
664 .mode = 0644,
665 .proc_handler = ftrace_enable_sysctl,
666 },
667 #endif
668 #ifdef CONFIG_STACK_TRACER
669 {
670 .procname = "stack_tracer_enabled",
671 .data = &stack_tracer_enabled,
672 .maxlen = sizeof(int),
673 .mode = 0644,
674 .proc_handler = stack_trace_sysctl,
675 },
676 #endif
677 #ifdef CONFIG_TRACING
678 {
679 .procname = "ftrace_dump_on_oops",
680 .data = &ftrace_dump_on_oops,
681 .maxlen = sizeof(int),
682 .mode = 0644,
683 .proc_handler = proc_dointvec,
684 },
685 {
686 .procname = "traceoff_on_warning",
687 .data = &__disable_trace_on_warning,
688 .maxlen = sizeof(__disable_trace_on_warning),
689 .mode = 0644,
690 .proc_handler = proc_dointvec,
691 },
692 {
693 .procname = "tracepoint_printk",
694 .data = &tracepoint_printk,
695 .maxlen = sizeof(tracepoint_printk),
696 .mode = 0644,
697 .proc_handler = tracepoint_printk_sysctl,
698 },
699 #endif
700 #ifdef CONFIG_KEXEC_CORE
701 {
702 .procname = "kexec_load_disabled",
703 .data = &kexec_load_disabled,
704 .maxlen = sizeof(int),
705 .mode = 0644,
706 /* only handle a transition from default "0" to "1" */
707 .proc_handler = proc_dointvec_minmax,
708 .extra1 = &one,
709 .extra2 = &one,
710 },
711 #endif
712 #ifdef CONFIG_MODULES
713 {
714 .procname = "modprobe",
715 .data = &modprobe_path,
716 .maxlen = KMOD_PATH_LEN,
717 .mode = 0644,
718 .proc_handler = proc_dostring,
719 },
720 {
721 .procname = "modules_disabled",
722 .data = &modules_disabled,
723 .maxlen = sizeof(int),
724 .mode = 0644,
725 /* only handle a transition from default "0" to "1" */
726 .proc_handler = proc_dointvec_minmax,
727 .extra1 = &one,
728 .extra2 = &one,
729 },
730 #endif
731 #ifdef CONFIG_UEVENT_HELPER
732 {
733 .procname = "hotplug",
734 .data = &uevent_helper,
735 .maxlen = UEVENT_HELPER_PATH_LEN,
736 .mode = 0644,
737 .proc_handler = proc_dostring,
738 },
739 #endif
740 #ifdef CONFIG_CHR_DEV_SG
741 {
742 .procname = "sg-big-buff",
743 .data = &sg_big_buff,
744 .maxlen = sizeof (int),
745 .mode = 0444,
746 .proc_handler = proc_dointvec,
747 },
748 #endif
749 #ifdef CONFIG_BSD_PROCESS_ACCT
750 {
751 .procname = "acct",
752 .data = &acct_parm,
753 .maxlen = 3*sizeof(int),
754 .mode = 0644,
755 .proc_handler = proc_dointvec,
756 },
757 #endif
758 #ifdef CONFIG_MAGIC_SYSRQ
759 {
760 .procname = "sysrq",
761 .data = &__sysrq_enabled,
762 .maxlen = sizeof (int),
763 .mode = 0644,
764 .proc_handler = sysrq_sysctl_handler,
765 },
766 #endif
767 #ifdef CONFIG_PROC_SYSCTL
768 {
769 .procname = "cad_pid",
770 .data = NULL,
771 .maxlen = sizeof (int),
772 .mode = 0600,
773 .proc_handler = proc_do_cad_pid,
774 },
775 #endif
776 {
777 .procname = "threads-max",
778 .data = NULL,
779 .maxlen = sizeof(int),
780 .mode = 0644,
781 .proc_handler = sysctl_max_threads,
782 },
783 {
784 .procname = "random",
785 .mode = 0555,
786 .child = random_table,
787 },
788 {
789 .procname = "usermodehelper",
790 .mode = 0555,
791 .child = usermodehelper_table,
792 },
793 {
794 .procname = "overflowuid",
795 .data = &overflowuid,
796 .maxlen = sizeof(int),
797 .mode = 0644,
798 .proc_handler = proc_dointvec_minmax,
799 .extra1 = &minolduid,
800 .extra2 = &maxolduid,
801 },
802 {
803 .procname = "overflowgid",
804 .data = &overflowgid,
805 .maxlen = sizeof(int),
806 .mode = 0644,
807 .proc_handler = proc_dointvec_minmax,
808 .extra1 = &minolduid,
809 .extra2 = &maxolduid,
810 },
811 #ifdef CONFIG_S390
812 #ifdef CONFIG_MATHEMU
813 {
814 .procname = "ieee_emulation_warnings",
815 .data = &sysctl_ieee_emulation_warnings,
816 .maxlen = sizeof(int),
817 .mode = 0644,
818 .proc_handler = proc_dointvec,
819 },
820 #endif
821 {
822 .procname = "userprocess_debug",
823 .data = &show_unhandled_signals,
824 .maxlen = sizeof(int),
825 .mode = 0644,
826 .proc_handler = proc_dointvec,
827 },
828 #endif
829 {
830 .procname = "pid_max",
831 .data = &pid_max,
832 .maxlen = sizeof (int),
833 .mode = 0644,
834 .proc_handler = proc_dointvec_minmax,
835 .extra1 = &pid_max_min,
836 .extra2 = &pid_max_max,
837 },
838 {
839 .procname = "panic_on_oops",
840 .data = &panic_on_oops,
841 .maxlen = sizeof(int),
842 .mode = 0644,
843 .proc_handler = proc_dointvec,
844 },
845 #if defined CONFIG_PRINTK
846 {
847 .procname = "printk",
848 .data = &console_loglevel,
849 .maxlen = 4*sizeof(int),
850 .mode = 0644,
851 .proc_handler = proc_dointvec,
852 },
853 {
854 .procname = "printk_ratelimit",
855 .data = &printk_ratelimit_state.interval,
856 .maxlen = sizeof(int),
857 .mode = 0644,
858 .proc_handler = proc_dointvec_jiffies,
859 },
860 {
861 .procname = "printk_ratelimit_burst",
862 .data = &printk_ratelimit_state.burst,
863 .maxlen = sizeof(int),
864 .mode = 0644,
865 .proc_handler = proc_dointvec,
866 },
867 {
868 .procname = "printk_delay",
869 .data = &printk_delay_msec,
870 .maxlen = sizeof(int),
871 .mode = 0644,
872 .proc_handler = proc_dointvec_minmax,
873 .extra1 = &zero,
874 .extra2 = &ten_thousand,
875 },
876 {
877 .procname = "printk_devkmsg",
878 .data = devkmsg_log_str,
879 .maxlen = DEVKMSG_STR_MAX_SIZE,
880 .mode = 0644,
881 .proc_handler = devkmsg_sysctl_set_loglvl,
882 },
883 {
884 .procname = "dmesg_restrict",
885 .data = &dmesg_restrict,
886 .maxlen = sizeof(int),
887 .mode = 0644,
888 .proc_handler = proc_dointvec_minmax_sysadmin,
889 .extra1 = &zero,
890 .extra2 = &one,
891 },
892 {
893 .procname = "kptr_restrict",
894 .data = &kptr_restrict,
895 .maxlen = sizeof(int),
896 .mode = 0644,
897 .proc_handler = proc_dointvec_minmax_sysadmin,
898 .extra1 = &zero,
899 .extra2 = &two,
900 },
901 #endif
902 {
903 .procname = "ngroups_max",
904 .data = &ngroups_max,
905 .maxlen = sizeof (int),
906 .mode = 0444,
907 .proc_handler = proc_dointvec,
908 },
909 {
910 .procname = "cap_last_cap",
911 .data = (void *)&cap_last_cap,
912 .maxlen = sizeof(int),
913 .mode = 0444,
914 .proc_handler = proc_dointvec,
915 },
916 #if defined(CONFIG_LOCKUP_DETECTOR)
917 {
918 .procname = "watchdog",
919 .data = &watchdog_user_enabled,
920 .maxlen = sizeof(int),
921 .mode = 0644,
922 .proc_handler = proc_watchdog,
923 .extra1 = &zero,
924 .extra2 = &one,
925 },
926 {
927 .procname = "watchdog_thresh",
928 .data = &watchdog_thresh,
929 .maxlen = sizeof(int),
930 .mode = 0644,
931 .proc_handler = proc_watchdog_thresh,
932 .extra1 = &zero,
933 .extra2 = &sixty,
934 },
935 {
936 .procname = "nmi_watchdog",
937 .data = &nmi_watchdog_user_enabled,
938 .maxlen = sizeof(int),
939 .mode = NMI_WATCHDOG_SYSCTL_PERM,
940 .proc_handler = proc_nmi_watchdog,
941 .extra1 = &zero,
942 .extra2 = &one,
943 },
944 {
945 .procname = "watchdog_cpumask",
946 .data = &watchdog_cpumask_bits,
947 .maxlen = NR_CPUS,
948 .mode = 0644,
949 .proc_handler = proc_watchdog_cpumask,
950 },
951 #ifdef CONFIG_SOFTLOCKUP_DETECTOR
952 {
953 .procname = "soft_watchdog",
954 .data = &soft_watchdog_user_enabled,
955 .maxlen = sizeof(int),
956 .mode = 0644,
957 .proc_handler = proc_soft_watchdog,
958 .extra1 = &zero,
959 .extra2 = &one,
960 },
961 {
962 .procname = "softlockup_panic",
963 .data = &softlockup_panic,
964 .maxlen = sizeof(int),
965 .mode = 0644,
966 .proc_handler = proc_dointvec_minmax,
967 .extra1 = &zero,
968 .extra2 = &one,
969 },
970 #ifdef CONFIG_SMP
971 {
972 .procname = "softlockup_all_cpu_backtrace",
973 .data = &sysctl_softlockup_all_cpu_backtrace,
974 .maxlen = sizeof(int),
975 .mode = 0644,
976 .proc_handler = proc_dointvec_minmax,
977 .extra1 = &zero,
978 .extra2 = &one,
979 },
980 #endif /* CONFIG_SMP */
981 #endif
982 #ifdef CONFIG_HARDLOCKUP_DETECTOR
983 {
984 .procname = "hardlockup_panic",
985 .data = &hardlockup_panic,
986 .maxlen = sizeof(int),
987 .mode = 0644,
988 .proc_handler = proc_dointvec_minmax,
989 .extra1 = &zero,
990 .extra2 = &one,
991 },
992 #ifdef CONFIG_SMP
993 {
994 .procname = "hardlockup_all_cpu_backtrace",
995 .data = &sysctl_hardlockup_all_cpu_backtrace,
996 .maxlen = sizeof(int),
997 .mode = 0644,
998 .proc_handler = proc_dointvec_minmax,
999 .extra1 = &zero,
1000 .extra2 = &one,
1001 },
1002 #endif /* CONFIG_SMP */
1003 #endif
1004 #endif
1005
1006 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
1007 {
1008 .procname = "unknown_nmi_panic",
1009 .data = &unknown_nmi_panic,
1010 .maxlen = sizeof (int),
1011 .mode = 0644,
1012 .proc_handler = proc_dointvec,
1013 },
1014 #endif
1015 #if defined(CONFIG_X86)
1016 {
1017 .procname = "panic_on_unrecovered_nmi",
1018 .data = &panic_on_unrecovered_nmi,
1019 .maxlen = sizeof(int),
1020 .mode = 0644,
1021 .proc_handler = proc_dointvec,
1022 },
1023 {
1024 .procname = "panic_on_io_nmi",
1025 .data = &panic_on_io_nmi,
1026 .maxlen = sizeof(int),
1027 .mode = 0644,
1028 .proc_handler = proc_dointvec,
1029 },
1030 #ifdef CONFIG_DEBUG_STACKOVERFLOW
1031 {
1032 .procname = "panic_on_stackoverflow",
1033 .data = &sysctl_panic_on_stackoverflow,
1034 .maxlen = sizeof(int),
1035 .mode = 0644,
1036 .proc_handler = proc_dointvec,
1037 },
1038 #endif
1039 {
1040 .procname = "bootloader_type",
1041 .data = &bootloader_type,
1042 .maxlen = sizeof (int),
1043 .mode = 0444,
1044 .proc_handler = proc_dointvec,
1045 },
1046 {
1047 .procname = "bootloader_version",
1048 .data = &bootloader_version,
1049 .maxlen = sizeof (int),
1050 .mode = 0444,
1051 .proc_handler = proc_dointvec,
1052 },
1053 {
1054 .procname = "io_delay_type",
1055 .data = &io_delay_type,
1056 .maxlen = sizeof(int),
1057 .mode = 0644,
1058 .proc_handler = proc_dointvec,
1059 },
1060 #endif
1061 #if defined(CONFIG_MMU)
1062 {
1063 .procname = "randomize_va_space",
1064 .data = &randomize_va_space,
1065 .maxlen = sizeof(int),
1066 .mode = 0644,
1067 .proc_handler = proc_dointvec,
1068 },
1069 #endif
1070 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
1071 {
1072 .procname = "spin_retry",
1073 .data = &spin_retry,
1074 .maxlen = sizeof (int),
1075 .mode = 0644,
1076 .proc_handler = proc_dointvec,
1077 },
1078 #endif
1079 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
1080 {
1081 .procname = "acpi_video_flags",
1082 .data = &acpi_realmode_flags,
1083 .maxlen = sizeof (unsigned long),
1084 .mode = 0644,
1085 .proc_handler = proc_doulongvec_minmax,
1086 },
1087 #endif
1088 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
1089 {
1090 .procname = "ignore-unaligned-usertrap",
1091 .data = &no_unaligned_warning,
1092 .maxlen = sizeof (int),
1093 .mode = 0644,
1094 .proc_handler = proc_dointvec,
1095 },
1096 #endif
1097 #ifdef CONFIG_IA64
1098 {
1099 .procname = "unaligned-dump-stack",
1100 .data = &unaligned_dump_stack,
1101 .maxlen = sizeof (int),
1102 .mode = 0644,
1103 .proc_handler = proc_dointvec,
1104 },
1105 #endif
1106 #ifdef CONFIG_DETECT_HUNG_TASK
1107 {
1108 .procname = "hung_task_panic",
1109 .data = &sysctl_hung_task_panic,
1110 .maxlen = sizeof(int),
1111 .mode = 0644,
1112 .proc_handler = proc_dointvec_minmax,
1113 .extra1 = &zero,
1114 .extra2 = &one,
1115 },
1116 {
1117 .procname = "hung_task_check_count",
1118 .data = &sysctl_hung_task_check_count,
1119 .maxlen = sizeof(int),
1120 .mode = 0644,
1121 .proc_handler = proc_dointvec_minmax,
1122 .extra1 = &zero,
1123 },
1124 {
1125 .procname = "hung_task_timeout_secs",
1126 .data = &sysctl_hung_task_timeout_secs,
1127 .maxlen = sizeof(unsigned long),
1128 .mode = 0644,
1129 .proc_handler = proc_dohung_task_timeout_secs,
1130 .extra2 = &hung_task_timeout_max,
1131 },
1132 {
1133 .procname = "hung_task_warnings",
1134 .data = &sysctl_hung_task_warnings,
1135 .maxlen = sizeof(int),
1136 .mode = 0644,
1137 .proc_handler = proc_dointvec_minmax,
1138 .extra1 = &neg_one,
1139 },
1140 #endif
1141 #ifdef CONFIG_RT_MUTEXES
1142 {
1143 .procname = "max_lock_depth",
1144 .data = &max_lock_depth,
1145 .maxlen = sizeof(int),
1146 .mode = 0644,
1147 .proc_handler = proc_dointvec,
1148 },
1149 #endif
1150 {
1151 .procname = "poweroff_cmd",
1152 .data = &poweroff_cmd,
1153 .maxlen = POWEROFF_CMD_PATH_LEN,
1154 .mode = 0644,
1155 .proc_handler = proc_dostring,
1156 },
1157 #ifdef CONFIG_KEYS
1158 {
1159 .procname = "keys",
1160 .mode = 0555,
1161 .child = key_sysctls,
1162 },
1163 #endif
1164 #ifdef CONFIG_PERF_EVENTS
1165 /*
1166 * User-space scripts rely on the existence of this file
1167 * as a feature check for perf_events being enabled.
1168 *
1169 * So it's an ABI, do not remove!
1170 */
1171 {
1172 .procname = "perf_event_paranoid",
1173 .data = &sysctl_perf_event_paranoid,
1174 .maxlen = sizeof(sysctl_perf_event_paranoid),
1175 .mode = 0644,
1176 .proc_handler = proc_dointvec,
1177 },
1178 {
1179 .procname = "perf_event_mlock_kb",
1180 .data = &sysctl_perf_event_mlock,
1181 .maxlen = sizeof(sysctl_perf_event_mlock),
1182 .mode = 0644,
1183 .proc_handler = proc_dointvec,
1184 },
1185 {
1186 .procname = "perf_event_max_sample_rate",
1187 .data = &sysctl_perf_event_sample_rate,
1188 .maxlen = sizeof(sysctl_perf_event_sample_rate),
1189 .mode = 0644,
1190 .proc_handler = perf_proc_update_handler,
1191 .extra1 = &one,
1192 },
1193 {
1194 .procname = "perf_cpu_time_max_percent",
1195 .data = &sysctl_perf_cpu_time_max_percent,
1196 .maxlen = sizeof(sysctl_perf_cpu_time_max_percent),
1197 .mode = 0644,
1198 .proc_handler = perf_cpu_time_max_percent_handler,
1199 .extra1 = &zero,
1200 .extra2 = &one_hundred,
1201 },
1202 {
1203 .procname = "perf_event_max_stack",
1204 .data = &sysctl_perf_event_max_stack,
1205 .maxlen = sizeof(sysctl_perf_event_max_stack),
1206 .mode = 0644,
1207 .proc_handler = perf_event_max_stack_handler,
1208 .extra1 = &zero,
1209 .extra2 = &six_hundred_forty_kb,
1210 },
1211 {
1212 .procname = "perf_event_max_contexts_per_stack",
1213 .data = &sysctl_perf_event_max_contexts_per_stack,
1214 .maxlen = sizeof(sysctl_perf_event_max_contexts_per_stack),
1215 .mode = 0644,
1216 .proc_handler = perf_event_max_stack_handler,
1217 .extra1 = &zero,
1218 .extra2 = &one_thousand,
1219 },
1220 #endif
1221 #ifdef CONFIG_KMEMCHECK
1222 {
1223 .procname = "kmemcheck",
1224 .data = &kmemcheck_enabled,
1225 .maxlen = sizeof(int),
1226 .mode = 0644,
1227 .proc_handler = proc_dointvec,
1228 },
1229 #endif
1230 {
1231 .procname = "panic_on_warn",
1232 .data = &panic_on_warn,
1233 .maxlen = sizeof(int),
1234 .mode = 0644,
1235 .proc_handler = proc_dointvec_minmax,
1236 .extra1 = &zero,
1237 .extra2 = &one,
1238 },
1239 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
1240 {
1241 .procname = "timer_migration",
1242 .data = &sysctl_timer_migration,
1243 .maxlen = sizeof(unsigned int),
1244 .mode = 0644,
1245 .proc_handler = timer_migration_handler,
1246 .extra1 = &zero,
1247 .extra2 = &one,
1248 },
1249 #endif
1250 #ifdef CONFIG_BPF_SYSCALL
1251 {
1252 .procname = "unprivileged_bpf_disabled",
1253 .data = &sysctl_unprivileged_bpf_disabled,
1254 .maxlen = sizeof(sysctl_unprivileged_bpf_disabled),
1255 .mode = 0644,
1256 /* only handle a transition from default "0" to "1" */
1257 .proc_handler = proc_dointvec_minmax,
1258 .extra1 = &one,
1259 .extra2 = &one,
1260 },
1261 #endif
1262 #if defined(CONFIG_TREE_RCU) || defined(CONFIG_PREEMPT_RCU)
1263 {
1264 .procname = "panic_on_rcu_stall",
1265 .data = &sysctl_panic_on_rcu_stall,
1266 .maxlen = sizeof(sysctl_panic_on_rcu_stall),
1267 .mode = 0644,
1268 .proc_handler = proc_dointvec_minmax,
1269 .extra1 = &zero,
1270 .extra2 = &one,
1271 },
1272 #endif
1273 { }
1274 };
1275
1276 static struct ctl_table vm_table[] = {
1277 {
1278 .procname = "overcommit_memory",
1279 .data = &sysctl_overcommit_memory,
1280 .maxlen = sizeof(sysctl_overcommit_memory),
1281 .mode = 0644,
1282 .proc_handler = proc_dointvec_minmax,
1283 .extra1 = &zero,
1284 .extra2 = &two,
1285 },
1286 {
1287 .procname = "panic_on_oom",
1288 .data = &sysctl_panic_on_oom,
1289 .maxlen = sizeof(sysctl_panic_on_oom),
1290 .mode = 0644,
1291 .proc_handler = proc_dointvec_minmax,
1292 .extra1 = &zero,
1293 .extra2 = &two,
1294 },
1295 {
1296 .procname = "oom_kill_allocating_task",
1297 .data = &sysctl_oom_kill_allocating_task,
1298 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1299 .mode = 0644,
1300 .proc_handler = proc_dointvec,
1301 },
1302 {
1303 .procname = "oom_dump_tasks",
1304 .data = &sysctl_oom_dump_tasks,
1305 .maxlen = sizeof(sysctl_oom_dump_tasks),
1306 .mode = 0644,
1307 .proc_handler = proc_dointvec,
1308 },
1309 {
1310 .procname = "overcommit_ratio",
1311 .data = &sysctl_overcommit_ratio,
1312 .maxlen = sizeof(sysctl_overcommit_ratio),
1313 .mode = 0644,
1314 .proc_handler = overcommit_ratio_handler,
1315 },
1316 {
1317 .procname = "overcommit_kbytes",
1318 .data = &sysctl_overcommit_kbytes,
1319 .maxlen = sizeof(sysctl_overcommit_kbytes),
1320 .mode = 0644,
1321 .proc_handler = overcommit_kbytes_handler,
1322 },
1323 {
1324 .procname = "page-cluster",
1325 .data = &page_cluster,
1326 .maxlen = sizeof(int),
1327 .mode = 0644,
1328 .proc_handler = proc_dointvec_minmax,
1329 .extra1 = &zero,
1330 },
1331 {
1332 .procname = "dirty_background_ratio",
1333 .data = &dirty_background_ratio,
1334 .maxlen = sizeof(dirty_background_ratio),
1335 .mode = 0644,
1336 .proc_handler = dirty_background_ratio_handler,
1337 .extra1 = &zero,
1338 .extra2 = &one_hundred,
1339 },
1340 {
1341 .procname = "dirty_background_bytes",
1342 .data = &dirty_background_bytes,
1343 .maxlen = sizeof(dirty_background_bytes),
1344 .mode = 0644,
1345 .proc_handler = dirty_background_bytes_handler,
1346 .extra1 = &one_ul,
1347 },
1348 {
1349 .procname = "dirty_ratio",
1350 .data = &vm_dirty_ratio,
1351 .maxlen = sizeof(vm_dirty_ratio),
1352 .mode = 0644,
1353 .proc_handler = dirty_ratio_handler,
1354 .extra1 = &zero,
1355 .extra2 = &one_hundred,
1356 },
1357 {
1358 .procname = "dirty_bytes",
1359 .data = &vm_dirty_bytes,
1360 .maxlen = sizeof(vm_dirty_bytes),
1361 .mode = 0644,
1362 .proc_handler = dirty_bytes_handler,
1363 .extra1 = &dirty_bytes_min,
1364 },
1365 {
1366 .procname = "dirty_writeback_centisecs",
1367 .data = &dirty_writeback_interval,
1368 .maxlen = sizeof(dirty_writeback_interval),
1369 .mode = 0644,
1370 .proc_handler = dirty_writeback_centisecs_handler,
1371 },
1372 {
1373 .procname = "dirty_expire_centisecs",
1374 .data = &dirty_expire_interval,
1375 .maxlen = sizeof(dirty_expire_interval),
1376 .mode = 0644,
1377 .proc_handler = proc_dointvec_minmax,
1378 .extra1 = &zero,
1379 },
1380 {
1381 .procname = "dirtytime_expire_seconds",
1382 .data = &dirtytime_expire_interval,
1383 .maxlen = sizeof(dirty_expire_interval),
1384 .mode = 0644,
1385 .proc_handler = dirtytime_interval_handler,
1386 .extra1 = &zero,
1387 },
1388 {
1389 .procname = "nr_pdflush_threads",
1390 .mode = 0444 /* read-only */,
1391 .proc_handler = pdflush_proc_obsolete,
1392 },
1393 {
1394 .procname = "swappiness",
1395 .data = &vm_swappiness,
1396 .maxlen = sizeof(vm_swappiness),
1397 .mode = 0644,
1398 .proc_handler = proc_dointvec_minmax,
1399 .extra1 = &zero,
1400 .extra2 = &one_hundred,
1401 },
1402 #ifdef CONFIG_HUGETLB_PAGE
1403 {
1404 .procname = "nr_hugepages",
1405 .data = NULL,
1406 .maxlen = sizeof(unsigned long),
1407 .mode = 0644,
1408 .proc_handler = hugetlb_sysctl_handler,
1409 },
1410 #ifdef CONFIG_NUMA
1411 {
1412 .procname = "nr_hugepages_mempolicy",
1413 .data = NULL,
1414 .maxlen = sizeof(unsigned long),
1415 .mode = 0644,
1416 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
1417 },
1418 #endif
1419 {
1420 .procname = "hugetlb_shm_group",
1421 .data = &sysctl_hugetlb_shm_group,
1422 .maxlen = sizeof(gid_t),
1423 .mode = 0644,
1424 .proc_handler = proc_dointvec,
1425 },
1426 {
1427 .procname = "hugepages_treat_as_movable",
1428 .data = &hugepages_treat_as_movable,
1429 .maxlen = sizeof(int),
1430 .mode = 0644,
1431 .proc_handler = proc_dointvec,
1432 },
1433 {
1434 .procname = "nr_overcommit_hugepages",
1435 .data = NULL,
1436 .maxlen = sizeof(unsigned long),
1437 .mode = 0644,
1438 .proc_handler = hugetlb_overcommit_handler,
1439 },
1440 #endif
1441 {
1442 .procname = "lowmem_reserve_ratio",
1443 .data = &sysctl_lowmem_reserve_ratio,
1444 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1445 .mode = 0644,
1446 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
1447 },
1448 {
1449 .procname = "drop_caches",
1450 .data = &sysctl_drop_caches,
1451 .maxlen = sizeof(int),
1452 .mode = 0644,
1453 .proc_handler = drop_caches_sysctl_handler,
1454 .extra1 = &one,
1455 .extra2 = &four,
1456 },
1457 #ifdef CONFIG_COMPACTION
1458 {
1459 .procname = "compact_memory",
1460 .data = &sysctl_compact_memory,
1461 .maxlen = sizeof(int),
1462 .mode = 0200,
1463 .proc_handler = sysctl_compaction_handler,
1464 },
1465 {
1466 .procname = "extfrag_threshold",
1467 .data = &sysctl_extfrag_threshold,
1468 .maxlen = sizeof(int),
1469 .mode = 0644,
1470 .proc_handler = sysctl_extfrag_handler,
1471 .extra1 = &min_extfrag_threshold,
1472 .extra2 = &max_extfrag_threshold,
1473 },
1474 {
1475 .procname = "compact_unevictable_allowed",
1476 .data = &sysctl_compact_unevictable_allowed,
1477 .maxlen = sizeof(int),
1478 .mode = 0644,
1479 .proc_handler = proc_dointvec,
1480 .extra1 = &zero,
1481 .extra2 = &one,
1482 },
1483
1484 #endif /* CONFIG_COMPACTION */
1485 {
1486 .procname = "min_free_kbytes",
1487 .data = &min_free_kbytes,
1488 .maxlen = sizeof(min_free_kbytes),
1489 .mode = 0644,
1490 .proc_handler = min_free_kbytes_sysctl_handler,
1491 .extra1 = &zero,
1492 },
1493 {
1494 .procname = "watermark_scale_factor",
1495 .data = &watermark_scale_factor,
1496 .maxlen = sizeof(watermark_scale_factor),
1497 .mode = 0644,
1498 .proc_handler = watermark_scale_factor_sysctl_handler,
1499 .extra1 = &one,
1500 .extra2 = &one_thousand,
1501 },
1502 {
1503 .procname = "percpu_pagelist_fraction",
1504 .data = &percpu_pagelist_fraction,
1505 .maxlen = sizeof(percpu_pagelist_fraction),
1506 .mode = 0644,
1507 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
1508 .extra1 = &zero,
1509 },
1510 #ifdef CONFIG_MMU
1511 {
1512 .procname = "max_map_count",
1513 .data = &sysctl_max_map_count,
1514 .maxlen = sizeof(sysctl_max_map_count),
1515 .mode = 0644,
1516 .proc_handler = proc_dointvec_minmax,
1517 .extra1 = &zero,
1518 },
1519 #else
1520 {
1521 .procname = "nr_trim_pages",
1522 .data = &sysctl_nr_trim_pages,
1523 .maxlen = sizeof(sysctl_nr_trim_pages),
1524 .mode = 0644,
1525 .proc_handler = proc_dointvec_minmax,
1526 .extra1 = &zero,
1527 },
1528 #endif
1529 {
1530 .procname = "laptop_mode",
1531 .data = &laptop_mode,
1532 .maxlen = sizeof(laptop_mode),
1533 .mode = 0644,
1534 .proc_handler = proc_dointvec_jiffies,
1535 },
1536 {
1537 .procname = "block_dump",
1538 .data = &block_dump,
1539 .maxlen = sizeof(block_dump),
1540 .mode = 0644,
1541 .proc_handler = proc_dointvec,
1542 .extra1 = &zero,
1543 },
1544 {
1545 .procname = "vfs_cache_pressure",
1546 .data = &sysctl_vfs_cache_pressure,
1547 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1548 .mode = 0644,
1549 .proc_handler = proc_dointvec,
1550 .extra1 = &zero,
1551 },
1552 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1553 {
1554 .procname = "legacy_va_layout",
1555 .data = &sysctl_legacy_va_layout,
1556 .maxlen = sizeof(sysctl_legacy_va_layout),
1557 .mode = 0644,
1558 .proc_handler = proc_dointvec,
1559 .extra1 = &zero,
1560 },
1561 #endif
1562 #ifdef CONFIG_NUMA
1563 {
1564 .procname = "zone_reclaim_mode",
1565 .data = &node_reclaim_mode,
1566 .maxlen = sizeof(node_reclaim_mode),
1567 .mode = 0644,
1568 .proc_handler = proc_dointvec,
1569 .extra1 = &zero,
1570 },
1571 {
1572 .procname = "min_unmapped_ratio",
1573 .data = &sysctl_min_unmapped_ratio,
1574 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1575 .mode = 0644,
1576 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
1577 .extra1 = &zero,
1578 .extra2 = &one_hundred,
1579 },
1580 {
1581 .procname = "min_slab_ratio",
1582 .data = &sysctl_min_slab_ratio,
1583 .maxlen = sizeof(sysctl_min_slab_ratio),
1584 .mode = 0644,
1585 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
1586 .extra1 = &zero,
1587 .extra2 = &one_hundred,
1588 },
1589 #endif
1590 #ifdef CONFIG_SMP
1591 {
1592 .procname = "stat_interval",
1593 .data = &sysctl_stat_interval,
1594 .maxlen = sizeof(sysctl_stat_interval),
1595 .mode = 0644,
1596 .proc_handler = proc_dointvec_jiffies,
1597 },
1598 {
1599 .procname = "stat_refresh",
1600 .data = NULL,
1601 .maxlen = 0,
1602 .mode = 0600,
1603 .proc_handler = vmstat_refresh,
1604 },
1605 #endif
1606 #ifdef CONFIG_MMU
1607 {
1608 .procname = "mmap_min_addr",
1609 .data = &dac_mmap_min_addr,
1610 .maxlen = sizeof(unsigned long),
1611 .mode = 0644,
1612 .proc_handler = mmap_min_addr_handler,
1613 },
1614 #endif
1615 #ifdef CONFIG_NUMA
1616 {
1617 .procname = "numa_zonelist_order",
1618 .data = &numa_zonelist_order,
1619 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1620 .mode = 0644,
1621 .proc_handler = numa_zonelist_order_handler,
1622 },
1623 #endif
1624 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1625 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1626 {
1627 .procname = "vdso_enabled",
1628 #ifdef CONFIG_X86_32
1629 .data = &vdso32_enabled,
1630 .maxlen = sizeof(vdso32_enabled),
1631 #else
1632 .data = &vdso_enabled,
1633 .maxlen = sizeof(vdso_enabled),
1634 #endif
1635 .mode = 0644,
1636 .proc_handler = proc_dointvec,
1637 .extra1 = &zero,
1638 },
1639 #endif
1640 #ifdef CONFIG_HIGHMEM
1641 {
1642 .procname = "highmem_is_dirtyable",
1643 .data = &vm_highmem_is_dirtyable,
1644 .maxlen = sizeof(vm_highmem_is_dirtyable),
1645 .mode = 0644,
1646 .proc_handler = proc_dointvec_minmax,
1647 .extra1 = &zero,
1648 .extra2 = &one,
1649 },
1650 #endif
1651 #ifdef CONFIG_MEMORY_FAILURE
1652 {
1653 .procname = "memory_failure_early_kill",
1654 .data = &sysctl_memory_failure_early_kill,
1655 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1656 .mode = 0644,
1657 .proc_handler = proc_dointvec_minmax,
1658 .extra1 = &zero,
1659 .extra2 = &one,
1660 },
1661 {
1662 .procname = "memory_failure_recovery",
1663 .data = &sysctl_memory_failure_recovery,
1664 .maxlen = sizeof(sysctl_memory_failure_recovery),
1665 .mode = 0644,
1666 .proc_handler = proc_dointvec_minmax,
1667 .extra1 = &zero,
1668 .extra2 = &one,
1669 },
1670 #endif
1671 {
1672 .procname = "user_reserve_kbytes",
1673 .data = &sysctl_user_reserve_kbytes,
1674 .maxlen = sizeof(sysctl_user_reserve_kbytes),
1675 .mode = 0644,
1676 .proc_handler = proc_doulongvec_minmax,
1677 },
1678 {
1679 .procname = "admin_reserve_kbytes",
1680 .data = &sysctl_admin_reserve_kbytes,
1681 .maxlen = sizeof(sysctl_admin_reserve_kbytes),
1682 .mode = 0644,
1683 .proc_handler = proc_doulongvec_minmax,
1684 },
1685 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS
1686 {
1687 .procname = "mmap_rnd_bits",
1688 .data = &mmap_rnd_bits,
1689 .maxlen = sizeof(mmap_rnd_bits),
1690 .mode = 0600,
1691 .proc_handler = proc_dointvec_minmax,
1692 .extra1 = (void *)&mmap_rnd_bits_min,
1693 .extra2 = (void *)&mmap_rnd_bits_max,
1694 },
1695 #endif
1696 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS
1697 {
1698 .procname = "mmap_rnd_compat_bits",
1699 .data = &mmap_rnd_compat_bits,
1700 .maxlen = sizeof(mmap_rnd_compat_bits),
1701 .mode = 0600,
1702 .proc_handler = proc_dointvec_minmax,
1703 .extra1 = (void *)&mmap_rnd_compat_bits_min,
1704 .extra2 = (void *)&mmap_rnd_compat_bits_max,
1705 },
1706 #endif
1707 { }
1708 };
1709
1710 static struct ctl_table fs_table[] = {
1711 {
1712 .procname = "inode-nr",
1713 .data = &inodes_stat,
1714 .maxlen = 2*sizeof(long),
1715 .mode = 0444,
1716 .proc_handler = proc_nr_inodes,
1717 },
1718 {
1719 .procname = "inode-state",
1720 .data = &inodes_stat,
1721 .maxlen = 7*sizeof(long),
1722 .mode = 0444,
1723 .proc_handler = proc_nr_inodes,
1724 },
1725 {
1726 .procname = "file-nr",
1727 .data = &files_stat,
1728 .maxlen = sizeof(files_stat),
1729 .mode = 0444,
1730 .proc_handler = proc_nr_files,
1731 },
1732 {
1733 .procname = "file-max",
1734 .data = &files_stat.max_files,
1735 .maxlen = sizeof(files_stat.max_files),
1736 .mode = 0644,
1737 .proc_handler = proc_doulongvec_minmax,
1738 },
1739 {
1740 .procname = "nr_open",
1741 .data = &sysctl_nr_open,
1742 .maxlen = sizeof(unsigned int),
1743 .mode = 0644,
1744 .proc_handler = proc_dointvec_minmax,
1745 .extra1 = &sysctl_nr_open_min,
1746 .extra2 = &sysctl_nr_open_max,
1747 },
1748 {
1749 .procname = "dentry-state",
1750 .data = &dentry_stat,
1751 .maxlen = 6*sizeof(long),
1752 .mode = 0444,
1753 .proc_handler = proc_nr_dentry,
1754 },
1755 {
1756 .procname = "overflowuid",
1757 .data = &fs_overflowuid,
1758 .maxlen = sizeof(int),
1759 .mode = 0644,
1760 .proc_handler = proc_dointvec_minmax,
1761 .extra1 = &minolduid,
1762 .extra2 = &maxolduid,
1763 },
1764 {
1765 .procname = "overflowgid",
1766 .data = &fs_overflowgid,
1767 .maxlen = sizeof(int),
1768 .mode = 0644,
1769 .proc_handler = proc_dointvec_minmax,
1770 .extra1 = &minolduid,
1771 .extra2 = &maxolduid,
1772 },
1773 #ifdef CONFIG_FILE_LOCKING
1774 {
1775 .procname = "leases-enable",
1776 .data = &leases_enable,
1777 .maxlen = sizeof(int),
1778 .mode = 0644,
1779 .proc_handler = proc_dointvec,
1780 },
1781 #endif
1782 #ifdef CONFIG_DNOTIFY
1783 {
1784 .procname = "dir-notify-enable",
1785 .data = &dir_notify_enable,
1786 .maxlen = sizeof(int),
1787 .mode = 0644,
1788 .proc_handler = proc_dointvec,
1789 },
1790 #endif
1791 #ifdef CONFIG_MMU
1792 #ifdef CONFIG_FILE_LOCKING
1793 {
1794 .procname = "lease-break-time",
1795 .data = &lease_break_time,
1796 .maxlen = sizeof(int),
1797 .mode = 0644,
1798 .proc_handler = proc_dointvec,
1799 },
1800 #endif
1801 #ifdef CONFIG_AIO
1802 {
1803 .procname = "aio-nr",
1804 .data = &aio_nr,
1805 .maxlen = sizeof(aio_nr),
1806 .mode = 0444,
1807 .proc_handler = proc_doulongvec_minmax,
1808 },
1809 {
1810 .procname = "aio-max-nr",
1811 .data = &aio_max_nr,
1812 .maxlen = sizeof(aio_max_nr),
1813 .mode = 0644,
1814 .proc_handler = proc_doulongvec_minmax,
1815 },
1816 #endif /* CONFIG_AIO */
1817 #ifdef CONFIG_INOTIFY_USER
1818 {
1819 .procname = "inotify",
1820 .mode = 0555,
1821 .child = inotify_table,
1822 },
1823 #endif
1824 #ifdef CONFIG_EPOLL
1825 {
1826 .procname = "epoll",
1827 .mode = 0555,
1828 .child = epoll_table,
1829 },
1830 #endif
1831 #endif
1832 {
1833 .procname = "protected_symlinks",
1834 .data = &sysctl_protected_symlinks,
1835 .maxlen = sizeof(int),
1836 .mode = 0600,
1837 .proc_handler = proc_dointvec_minmax,
1838 .extra1 = &zero,
1839 .extra2 = &one,
1840 },
1841 {
1842 .procname = "protected_hardlinks",
1843 .data = &sysctl_protected_hardlinks,
1844 .maxlen = sizeof(int),
1845 .mode = 0600,
1846 .proc_handler = proc_dointvec_minmax,
1847 .extra1 = &zero,
1848 .extra2 = &one,
1849 },
1850 {
1851 .procname = "suid_dumpable",
1852 .data = &suid_dumpable,
1853 .maxlen = sizeof(int),
1854 .mode = 0644,
1855 .proc_handler = proc_dointvec_minmax_coredump,
1856 .extra1 = &zero,
1857 .extra2 = &two,
1858 },
1859 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1860 {
1861 .procname = "binfmt_misc",
1862 .mode = 0555,
1863 .child = sysctl_mount_point,
1864 },
1865 #endif
1866 {
1867 .procname = "pipe-max-size",
1868 .data = &pipe_max_size,
1869 .maxlen = sizeof(pipe_max_size),
1870 .mode = 0644,
1871 .proc_handler = &pipe_proc_fn,
1872 .extra1 = &pipe_min_size,
1873 },
1874 {
1875 .procname = "pipe-user-pages-hard",
1876 .data = &pipe_user_pages_hard,
1877 .maxlen = sizeof(pipe_user_pages_hard),
1878 .mode = 0644,
1879 .proc_handler = proc_doulongvec_minmax,
1880 },
1881 {
1882 .procname = "pipe-user-pages-soft",
1883 .data = &pipe_user_pages_soft,
1884 .maxlen = sizeof(pipe_user_pages_soft),
1885 .mode = 0644,
1886 .proc_handler = proc_doulongvec_minmax,
1887 },
1888 {
1889 .procname = "mount-max",
1890 .data = &sysctl_mount_max,
1891 .maxlen = sizeof(unsigned int),
1892 .mode = 0644,
1893 .proc_handler = proc_dointvec_minmax,
1894 .extra1 = &one,
1895 },
1896 { }
1897 };
1898
1899 static struct ctl_table debug_table[] = {
1900 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1901 {
1902 .procname = "exception-trace",
1903 .data = &show_unhandled_signals,
1904 .maxlen = sizeof(int),
1905 .mode = 0644,
1906 .proc_handler = proc_dointvec
1907 },
1908 #endif
1909 #if defined(CONFIG_OPTPROBES)
1910 {
1911 .procname = "kprobes-optimization",
1912 .data = &sysctl_kprobes_optimization,
1913 .maxlen = sizeof(int),
1914 .mode = 0644,
1915 .proc_handler = proc_kprobes_optimization_handler,
1916 .extra1 = &zero,
1917 .extra2 = &one,
1918 },
1919 #endif
1920 { }
1921 };
1922
1923 static struct ctl_table dev_table[] = {
1924 { }
1925 };
1926
1927 int __init sysctl_init(void)
1928 {
1929 struct ctl_table_header *hdr;
1930
1931 hdr = register_sysctl_table(sysctl_base_table);
1932 kmemleak_not_leak(hdr);
1933 return 0;
1934 }
1935
1936 #endif /* CONFIG_SYSCTL */
1937
1938 /*
1939 * /proc/sys support
1940 */
1941
1942 #ifdef CONFIG_PROC_SYSCTL
1943
1944 static int _proc_do_string(char *data, int maxlen, int write,
1945 char __user *buffer,
1946 size_t *lenp, loff_t *ppos)
1947 {
1948 size_t len;
1949 char __user *p;
1950 char c;
1951
1952 if (!data || !maxlen || !*lenp) {
1953 *lenp = 0;
1954 return 0;
1955 }
1956
1957 if (write) {
1958 if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) {
1959 /* Only continue writes not past the end of buffer. */
1960 len = strlen(data);
1961 if (len > maxlen - 1)
1962 len = maxlen - 1;
1963
1964 if (*ppos > len)
1965 return 0;
1966 len = *ppos;
1967 } else {
1968 /* Start writing from beginning of buffer. */
1969 len = 0;
1970 }
1971
1972 *ppos += *lenp;
1973 p = buffer;
1974 while ((p - buffer) < *lenp && len < maxlen - 1) {
1975 if (get_user(c, p++))
1976 return -EFAULT;
1977 if (c == 0 || c == '\n')
1978 break;
1979 data[len++] = c;
1980 }
1981 data[len] = 0;
1982 } else {
1983 len = strlen(data);
1984 if (len > maxlen)
1985 len = maxlen;
1986
1987 if (*ppos > len) {
1988 *lenp = 0;
1989 return 0;
1990 }
1991
1992 data += *ppos;
1993 len -= *ppos;
1994
1995 if (len > *lenp)
1996 len = *lenp;
1997 if (len)
1998 if (copy_to_user(buffer, data, len))
1999 return -EFAULT;
2000 if (len < *lenp) {
2001 if (put_user('\n', buffer + len))
2002 return -EFAULT;
2003 len++;
2004 }
2005 *lenp = len;
2006 *ppos += len;
2007 }
2008 return 0;
2009 }
2010
2011 static void warn_sysctl_write(struct ctl_table *table)
2012 {
2013 pr_warn_once("%s wrote to %s when file position was not 0!\n"
2014 "This will not be supported in the future. To silence this\n"
2015 "warning, set kernel.sysctl_writes_strict = -1\n",
2016 current->comm, table->procname);
2017 }
2018
2019 /**
2020 * proc_first_pos_non_zero_ignore - check if firs position is allowed
2021 * @ppos: file position
2022 * @table: the sysctl table
2023 *
2024 * Returns true if the first position is non-zero and the sysctl_writes_strict
2025 * mode indicates this is not allowed for numeric input types. String proc
2026 * hadlers can ignore the return value.
2027 */
2028 static bool proc_first_pos_non_zero_ignore(loff_t *ppos,
2029 struct ctl_table *table)
2030 {
2031 if (!*ppos)
2032 return false;
2033
2034 switch (sysctl_writes_strict) {
2035 case SYSCTL_WRITES_STRICT:
2036 return true;
2037 case SYSCTL_WRITES_WARN:
2038 warn_sysctl_write(table);
2039 return false;
2040 default:
2041 return false;
2042 }
2043 }
2044
2045 /**
2046 * proc_dostring - read a string sysctl
2047 * @table: the sysctl table
2048 * @write: %TRUE if this is a write to the sysctl file
2049 * @buffer: the user buffer
2050 * @lenp: the size of the user buffer
2051 * @ppos: file position
2052 *
2053 * Reads/writes a string from/to the user buffer. If the kernel
2054 * buffer provided is not large enough to hold the string, the
2055 * string is truncated. The copied string is %NULL-terminated.
2056 * If the string is being read by the user process, it is copied
2057 * and a newline '\n' is added. It is truncated if the buffer is
2058 * not large enough.
2059 *
2060 * Returns 0 on success.
2061 */
2062 int proc_dostring(struct ctl_table *table, int write,
2063 void __user *buffer, size_t *lenp, loff_t *ppos)
2064 {
2065 if (write)
2066 proc_first_pos_non_zero_ignore(ppos, table);
2067
2068 return _proc_do_string((char *)(table->data), table->maxlen, write,
2069 (char __user *)buffer, lenp, ppos);
2070 }
2071
2072 static size_t proc_skip_spaces(char **buf)
2073 {
2074 size_t ret;
2075 char *tmp = skip_spaces(*buf);
2076 ret = tmp - *buf;
2077 *buf = tmp;
2078 return ret;
2079 }
2080
2081 static void proc_skip_char(char **buf, size_t *size, const char v)
2082 {
2083 while (*size) {
2084 if (**buf != v)
2085 break;
2086 (*size)--;
2087 (*buf)++;
2088 }
2089 }
2090
2091 #define TMPBUFLEN 22
2092 /**
2093 * proc_get_long - reads an ASCII formatted integer from a user buffer
2094 *
2095 * @buf: a kernel buffer
2096 * @size: size of the kernel buffer
2097 * @val: this is where the number will be stored
2098 * @neg: set to %TRUE if number is negative
2099 * @perm_tr: a vector which contains the allowed trailers
2100 * @perm_tr_len: size of the perm_tr vector
2101 * @tr: pointer to store the trailer character
2102 *
2103 * In case of success %0 is returned and @buf and @size are updated with
2104 * the amount of bytes read. If @tr is non-NULL and a trailing
2105 * character exists (size is non-zero after returning from this
2106 * function), @tr is updated with the trailing character.
2107 */
2108 static int proc_get_long(char **buf, size_t *size,
2109 unsigned long *val, bool *neg,
2110 const char *perm_tr, unsigned perm_tr_len, char *tr)
2111 {
2112 int len;
2113 char *p, tmp[TMPBUFLEN];
2114
2115 if (!*size)
2116 return -EINVAL;
2117
2118 len = *size;
2119 if (len > TMPBUFLEN - 1)
2120 len = TMPBUFLEN - 1;
2121
2122 memcpy(tmp, *buf, len);
2123
2124 tmp[len] = 0;
2125 p = tmp;
2126 if (*p == '-' && *size > 1) {
2127 *neg = true;
2128 p++;
2129 } else
2130 *neg = false;
2131 if (!isdigit(*p))
2132 return -EINVAL;
2133
2134 *val = simple_strtoul(p, &p, 0);
2135
2136 len = p - tmp;
2137
2138 /* We don't know if the next char is whitespace thus we may accept
2139 * invalid integers (e.g. 1234...a) or two integers instead of one
2140 * (e.g. 123...1). So lets not allow such large numbers. */
2141 if (len == TMPBUFLEN - 1)
2142 return -EINVAL;
2143
2144 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
2145 return -EINVAL;
2146
2147 if (tr && (len < *size))
2148 *tr = *p;
2149
2150 *buf += len;
2151 *size -= len;
2152
2153 return 0;
2154 }
2155
2156 /**
2157 * proc_put_long - converts an integer to a decimal ASCII formatted string
2158 *
2159 * @buf: the user buffer
2160 * @size: the size of the user buffer
2161 * @val: the integer to be converted
2162 * @neg: sign of the number, %TRUE for negative
2163 *
2164 * In case of success %0 is returned and @buf and @size are updated with
2165 * the amount of bytes written.
2166 */
2167 static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
2168 bool neg)
2169 {
2170 int len;
2171 char tmp[TMPBUFLEN], *p = tmp;
2172
2173 sprintf(p, "%s%lu", neg ? "-" : "", val);
2174 len = strlen(tmp);
2175 if (len > *size)
2176 len = *size;
2177 if (copy_to_user(*buf, tmp, len))
2178 return -EFAULT;
2179 *size -= len;
2180 *buf += len;
2181 return 0;
2182 }
2183 #undef TMPBUFLEN
2184
2185 static int proc_put_char(void __user **buf, size_t *size, char c)
2186 {
2187 if (*size) {
2188 char __user **buffer = (char __user **)buf;
2189 if (put_user(c, *buffer))
2190 return -EFAULT;
2191 (*size)--, (*buffer)++;
2192 *buf = *buffer;
2193 }
2194 return 0;
2195 }
2196
2197 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
2198 int *valp,
2199 int write, void *data)
2200 {
2201 if (write) {
2202 if (*negp) {
2203 if (*lvalp > (unsigned long) INT_MAX + 1)
2204 return -EINVAL;
2205 *valp = -*lvalp;
2206 } else {
2207 if (*lvalp > (unsigned long) INT_MAX)
2208 return -EINVAL;
2209 *valp = *lvalp;
2210 }
2211 } else {
2212 int val = *valp;
2213 if (val < 0) {
2214 *negp = true;
2215 *lvalp = -(unsigned long)val;
2216 } else {
2217 *negp = false;
2218 *lvalp = (unsigned long)val;
2219 }
2220 }
2221 return 0;
2222 }
2223
2224 static int do_proc_douintvec_conv(unsigned long *lvalp,
2225 unsigned int *valp,
2226 int write, void *data)
2227 {
2228 if (write) {
2229 if (*lvalp > UINT_MAX)
2230 return -EINVAL;
2231 *valp = *lvalp;
2232 } else {
2233 unsigned int val = *valp;
2234 *lvalp = (unsigned long)val;
2235 }
2236 return 0;
2237 }
2238
2239 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
2240
2241 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
2242 int write, void __user *buffer,
2243 size_t *lenp, loff_t *ppos,
2244 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2245 int write, void *data),
2246 void *data)
2247 {
2248 int *i, vleft, first = 1, err = 0;
2249 size_t left;
2250 char *kbuf = NULL, *p;
2251
2252 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
2253 *lenp = 0;
2254 return 0;
2255 }
2256
2257 i = (int *) tbl_data;
2258 vleft = table->maxlen / sizeof(*i);
2259 left = *lenp;
2260
2261 if (!conv)
2262 conv = do_proc_dointvec_conv;
2263
2264 if (write) {
2265 if (proc_first_pos_non_zero_ignore(ppos, table))
2266 goto out;
2267
2268 if (left > PAGE_SIZE - 1)
2269 left = PAGE_SIZE - 1;
2270 p = kbuf = memdup_user_nul(buffer, left);
2271 if (IS_ERR(kbuf))
2272 return PTR_ERR(kbuf);
2273 }
2274
2275 for (; left && vleft--; i++, first=0) {
2276 unsigned long lval;
2277 bool neg;
2278
2279 if (write) {
2280 left -= proc_skip_spaces(&p);
2281
2282 if (!left)
2283 break;
2284 err = proc_get_long(&p, &left, &lval, &neg,
2285 proc_wspace_sep,
2286 sizeof(proc_wspace_sep), NULL);
2287 if (err)
2288 break;
2289 if (conv(&neg, &lval, i, 1, data)) {
2290 err = -EINVAL;
2291 break;
2292 }
2293 } else {
2294 if (conv(&neg, &lval, i, 0, data)) {
2295 err = -EINVAL;
2296 break;
2297 }
2298 if (!first)
2299 err = proc_put_char(&buffer, &left, '\t');
2300 if (err)
2301 break;
2302 err = proc_put_long(&buffer, &left, lval, neg);
2303 if (err)
2304 break;
2305 }
2306 }
2307
2308 if (!write && !first && left && !err)
2309 err = proc_put_char(&buffer, &left, '\n');
2310 if (write && !err && left)
2311 left -= proc_skip_spaces(&p);
2312 if (write) {
2313 kfree(kbuf);
2314 if (first)
2315 return err ? : -EINVAL;
2316 }
2317 *lenp -= left;
2318 out:
2319 *ppos += *lenp;
2320 return err;
2321 }
2322
2323 static int do_proc_dointvec(struct ctl_table *table, int write,
2324 void __user *buffer, size_t *lenp, loff_t *ppos,
2325 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2326 int write, void *data),
2327 void *data)
2328 {
2329 return __do_proc_dointvec(table->data, table, write,
2330 buffer, lenp, ppos, conv, data);
2331 }
2332
2333 static int do_proc_douintvec_w(unsigned int *tbl_data,
2334 struct ctl_table *table,
2335 void __user *buffer,
2336 size_t *lenp, loff_t *ppos,
2337 int (*conv)(unsigned long *lvalp,
2338 unsigned int *valp,
2339 int write, void *data),
2340 void *data)
2341 {
2342 unsigned long lval;
2343 int err = 0;
2344 size_t left;
2345 bool neg;
2346 char *kbuf = NULL, *p;
2347
2348 left = *lenp;
2349
2350 if (proc_first_pos_non_zero_ignore(ppos, table))
2351 goto bail_early;
2352
2353 if (left > PAGE_SIZE - 1)
2354 left = PAGE_SIZE - 1;
2355
2356 p = kbuf = memdup_user_nul(buffer, left);
2357 if (IS_ERR(kbuf))
2358 return -EINVAL;
2359
2360 left -= proc_skip_spaces(&p);
2361 if (!left) {
2362 err = -EINVAL;
2363 goto out_free;
2364 }
2365
2366 err = proc_get_long(&p, &left, &lval, &neg,
2367 proc_wspace_sep,
2368 sizeof(proc_wspace_sep), NULL);
2369 if (err || neg) {
2370 err = -EINVAL;
2371 goto out_free;
2372 }
2373
2374 if (conv(&lval, tbl_data, 1, data)) {
2375 err = -EINVAL;
2376 goto out_free;
2377 }
2378
2379 if (!err && left)
2380 left -= proc_skip_spaces(&p);
2381
2382 out_free:
2383 kfree(kbuf);
2384 if (err)
2385 return -EINVAL;
2386
2387 return 0;
2388
2389 /* This is in keeping with old __do_proc_dointvec() */
2390 bail_early:
2391 *ppos += *lenp;
2392 return err;
2393 }
2394
2395 static int do_proc_douintvec_r(unsigned int *tbl_data, void __user *buffer,
2396 size_t *lenp, loff_t *ppos,
2397 int (*conv)(unsigned long *lvalp,
2398 unsigned int *valp,
2399 int write, void *data),
2400 void *data)
2401 {
2402 unsigned long lval;
2403 int err = 0;
2404 size_t left;
2405
2406 left = *lenp;
2407
2408 if (conv(&lval, tbl_data, 0, data)) {
2409 err = -EINVAL;
2410 goto out;
2411 }
2412
2413 err = proc_put_long(&buffer, &left, lval, false);
2414 if (err || !left)
2415 goto out;
2416
2417 err = proc_put_char(&buffer, &left, '\n');
2418
2419 out:
2420 *lenp -= left;
2421 *ppos += *lenp;
2422
2423 return err;
2424 }
2425
2426 static int __do_proc_douintvec(void *tbl_data, struct ctl_table *table,
2427 int write, void __user *buffer,
2428 size_t *lenp, loff_t *ppos,
2429 int (*conv)(unsigned long *lvalp,
2430 unsigned int *valp,
2431 int write, void *data),
2432 void *data)
2433 {
2434 unsigned int *i, vleft;
2435
2436 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
2437 *lenp = 0;
2438 return 0;
2439 }
2440
2441 i = (unsigned int *) tbl_data;
2442 vleft = table->maxlen / sizeof(*i);
2443
2444 /*
2445 * Arrays are not supported, keep this simple. *Do not* add
2446 * support for them.
2447 */
2448 if (vleft != 1) {
2449 *lenp = 0;
2450 return -EINVAL;
2451 }
2452
2453 if (!conv)
2454 conv = do_proc_douintvec_conv;
2455
2456 if (write)
2457 return do_proc_douintvec_w(i, table, buffer, lenp, ppos,
2458 conv, data);
2459 return do_proc_douintvec_r(i, buffer, lenp, ppos, conv, data);
2460 }
2461
2462 static int do_proc_douintvec(struct ctl_table *table, int write,
2463 void __user *buffer, size_t *lenp, loff_t *ppos,
2464 int (*conv)(unsigned long *lvalp,
2465 unsigned int *valp,
2466 int write, void *data),
2467 void *data)
2468 {
2469 return __do_proc_douintvec(table->data, table, write,
2470 buffer, lenp, ppos, conv, data);
2471 }
2472
2473 /**
2474 * proc_dointvec - read a vector of integers
2475 * @table: the sysctl table
2476 * @write: %TRUE if this is a write to the sysctl file
2477 * @buffer: the user buffer
2478 * @lenp: the size of the user buffer
2479 * @ppos: file position
2480 *
2481 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2482 * values from/to the user buffer, treated as an ASCII string.
2483 *
2484 * Returns 0 on success.
2485 */
2486 int proc_dointvec(struct ctl_table *table, int write,
2487 void __user *buffer, size_t *lenp, loff_t *ppos)
2488 {
2489 return do_proc_dointvec(table, write, buffer, lenp, ppos, NULL, NULL);
2490 }
2491
2492 /**
2493 * proc_douintvec - read a vector of unsigned integers
2494 * @table: the sysctl table
2495 * @write: %TRUE if this is a write to the sysctl file
2496 * @buffer: the user buffer
2497 * @lenp: the size of the user buffer
2498 * @ppos: file position
2499 *
2500 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
2501 * values from/to the user buffer, treated as an ASCII string.
2502 *
2503 * Returns 0 on success.
2504 */
2505 int proc_douintvec(struct ctl_table *table, int write,
2506 void __user *buffer, size_t *lenp, loff_t *ppos)
2507 {
2508 return do_proc_douintvec(table, write, buffer, lenp, ppos,
2509 do_proc_douintvec_conv, NULL);
2510 }
2511
2512 /*
2513 * Taint values can only be increased
2514 * This means we can safely use a temporary.
2515 */
2516 static int proc_taint(struct ctl_table *table, int write,
2517 void __user *buffer, size_t *lenp, loff_t *ppos)
2518 {
2519 struct ctl_table t;
2520 unsigned long tmptaint = get_taint();
2521 int err;
2522
2523 if (write && !capable(CAP_SYS_ADMIN))
2524 return -EPERM;
2525
2526 t = *table;
2527 t.data = &tmptaint;
2528 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2529 if (err < 0)
2530 return err;
2531
2532 if (write) {
2533 /*
2534 * Poor man's atomic or. Not worth adding a primitive
2535 * to everyone's atomic.h for this
2536 */
2537 int i;
2538 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2539 if ((tmptaint >> i) & 1)
2540 add_taint(i, LOCKDEP_STILL_OK);
2541 }
2542 }
2543
2544 return err;
2545 }
2546
2547 #ifdef CONFIG_PRINTK
2548 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
2549 void __user *buffer, size_t *lenp, loff_t *ppos)
2550 {
2551 if (write && !capable(CAP_SYS_ADMIN))
2552 return -EPERM;
2553
2554 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2555 }
2556 #endif
2557
2558 struct do_proc_dointvec_minmax_conv_param {
2559 int *min;
2560 int *max;
2561 };
2562
2563 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2564 int *valp,
2565 int write, void *data)
2566 {
2567 struct do_proc_dointvec_minmax_conv_param *param = data;
2568 if (write) {
2569 int val = *negp ? -*lvalp : *lvalp;
2570 if ((param->min && *param->min > val) ||
2571 (param->max && *param->max < val))
2572 return -EINVAL;
2573 *valp = val;
2574 } else {
2575 int val = *valp;
2576 if (val < 0) {
2577 *negp = true;
2578 *lvalp = -(unsigned long)val;
2579 } else {
2580 *negp = false;
2581 *lvalp = (unsigned long)val;
2582 }
2583 }
2584 return 0;
2585 }
2586
2587 /**
2588 * proc_dointvec_minmax - read a vector of integers with min/max values
2589 * @table: the sysctl table
2590 * @write: %TRUE if this is a write to the sysctl file
2591 * @buffer: the user buffer
2592 * @lenp: the size of the user buffer
2593 * @ppos: file position
2594 *
2595 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2596 * values from/to the user buffer, treated as an ASCII string.
2597 *
2598 * This routine will ensure the values are within the range specified by
2599 * table->extra1 (min) and table->extra2 (max).
2600 *
2601 * Returns 0 on success.
2602 */
2603 int proc_dointvec_minmax(struct ctl_table *table, int write,
2604 void __user *buffer, size_t *lenp, loff_t *ppos)
2605 {
2606 struct do_proc_dointvec_minmax_conv_param param = {
2607 .min = (int *) table->extra1,
2608 .max = (int *) table->extra2,
2609 };
2610 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2611 do_proc_dointvec_minmax_conv, &param);
2612 }
2613
2614 struct do_proc_douintvec_minmax_conv_param {
2615 unsigned int *min;
2616 unsigned int *max;
2617 };
2618
2619 static int do_proc_douintvec_minmax_conv(unsigned long *lvalp,
2620 unsigned int *valp,
2621 int write, void *data)
2622 {
2623 struct do_proc_douintvec_minmax_conv_param *param = data;
2624
2625 if (write) {
2626 unsigned int val = *lvalp;
2627
2628 if ((param->min && *param->min > val) ||
2629 (param->max && *param->max < val))
2630 return -ERANGE;
2631
2632 if (*lvalp > UINT_MAX)
2633 return -EINVAL;
2634 *valp = val;
2635 } else {
2636 unsigned int val = *valp;
2637 *lvalp = (unsigned long) val;
2638 }
2639
2640 return 0;
2641 }
2642
2643 /**
2644 * proc_douintvec_minmax - read a vector of unsigned ints with min/max values
2645 * @table: the sysctl table
2646 * @write: %TRUE if this is a write to the sysctl file
2647 * @buffer: the user buffer
2648 * @lenp: the size of the user buffer
2649 * @ppos: file position
2650 *
2651 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
2652 * values from/to the user buffer, treated as an ASCII string. Negative
2653 * strings are not allowed.
2654 *
2655 * This routine will ensure the values are within the range specified by
2656 * table->extra1 (min) and table->extra2 (max). There is a final sanity
2657 * check for UINT_MAX to avoid having to support wrap around uses from
2658 * userspace.
2659 *
2660 * Returns 0 on success.
2661 */
2662 int proc_douintvec_minmax(struct ctl_table *table, int write,
2663 void __user *buffer, size_t *lenp, loff_t *ppos)
2664 {
2665 struct do_proc_douintvec_minmax_conv_param param = {
2666 .min = (unsigned int *) table->extra1,
2667 .max = (unsigned int *) table->extra2,
2668 };
2669 return do_proc_douintvec(table, write, buffer, lenp, ppos,
2670 do_proc_douintvec_minmax_conv, &param);
2671 }
2672
2673 static void validate_coredump_safety(void)
2674 {
2675 #ifdef CONFIG_COREDUMP
2676 if (suid_dumpable == SUID_DUMP_ROOT &&
2677 core_pattern[0] != '/' && core_pattern[0] != '|') {
2678 printk(KERN_WARNING
2679 "Unsafe core_pattern used with fs.suid_dumpable=2.\n"
2680 "Pipe handler or fully qualified core dump path required.\n"
2681 "Set kernel.core_pattern before fs.suid_dumpable.\n"
2682 );
2683 }
2684 #endif
2685 }
2686
2687 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2688 void __user *buffer, size_t *lenp, loff_t *ppos)
2689 {
2690 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2691 if (!error)
2692 validate_coredump_safety();
2693 return error;
2694 }
2695
2696 #ifdef CONFIG_COREDUMP
2697 static int proc_dostring_coredump(struct ctl_table *table, int write,
2698 void __user *buffer, size_t *lenp, loff_t *ppos)
2699 {
2700 int error = proc_dostring(table, write, buffer, lenp, ppos);
2701 if (!error)
2702 validate_coredump_safety();
2703 return error;
2704 }
2705 #endif
2706
2707 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2708 void __user *buffer,
2709 size_t *lenp, loff_t *ppos,
2710 unsigned long convmul,
2711 unsigned long convdiv)
2712 {
2713 unsigned long *i, *min, *max;
2714 int vleft, first = 1, err = 0;
2715 size_t left;
2716 char *kbuf = NULL, *p;
2717
2718 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2719 *lenp = 0;
2720 return 0;
2721 }
2722
2723 i = (unsigned long *) data;
2724 min = (unsigned long *) table->extra1;
2725 max = (unsigned long *) table->extra2;
2726 vleft = table->maxlen / sizeof(unsigned long);
2727 left = *lenp;
2728
2729 if (write) {
2730 if (proc_first_pos_non_zero_ignore(ppos, table))
2731 goto out;
2732
2733 if (left > PAGE_SIZE - 1)
2734 left = PAGE_SIZE - 1;
2735 p = kbuf = memdup_user_nul(buffer, left);
2736 if (IS_ERR(kbuf))
2737 return PTR_ERR(kbuf);
2738 }
2739
2740 for (; left && vleft--; i++, first = 0) {
2741 unsigned long val;
2742
2743 if (write) {
2744 bool neg;
2745
2746 left -= proc_skip_spaces(&p);
2747
2748 err = proc_get_long(&p, &left, &val, &neg,
2749 proc_wspace_sep,
2750 sizeof(proc_wspace_sep), NULL);
2751 if (err)
2752 break;
2753 if (neg)
2754 continue;
2755 val = convmul * val / convdiv;
2756 if ((min && val < *min) || (max && val > *max))
2757 continue;
2758 *i = val;
2759 } else {
2760 val = convdiv * (*i) / convmul;
2761 if (!first) {
2762 err = proc_put_char(&buffer, &left, '\t');
2763 if (err)
2764 break;
2765 }
2766 err = proc_put_long(&buffer, &left, val, false);
2767 if (err)
2768 break;
2769 }
2770 }
2771
2772 if (!write && !first && left && !err)
2773 err = proc_put_char(&buffer, &left, '\n');
2774 if (write && !err)
2775 left -= proc_skip_spaces(&p);
2776 if (write) {
2777 kfree(kbuf);
2778 if (first)
2779 return err ? : -EINVAL;
2780 }
2781 *lenp -= left;
2782 out:
2783 *ppos += *lenp;
2784 return err;
2785 }
2786
2787 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2788 void __user *buffer,
2789 size_t *lenp, loff_t *ppos,
2790 unsigned long convmul,
2791 unsigned long convdiv)
2792 {
2793 return __do_proc_doulongvec_minmax(table->data, table, write,
2794 buffer, lenp, ppos, convmul, convdiv);
2795 }
2796
2797 /**
2798 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2799 * @table: the sysctl table
2800 * @write: %TRUE if this is a write to the sysctl file
2801 * @buffer: the user buffer
2802 * @lenp: the size of the user buffer
2803 * @ppos: file position
2804 *
2805 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2806 * values from/to the user buffer, treated as an ASCII string.
2807 *
2808 * This routine will ensure the values are within the range specified by
2809 * table->extra1 (min) and table->extra2 (max).
2810 *
2811 * Returns 0 on success.
2812 */
2813 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2814 void __user *buffer, size_t *lenp, loff_t *ppos)
2815 {
2816 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2817 }
2818
2819 /**
2820 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2821 * @table: the sysctl table
2822 * @write: %TRUE if this is a write to the sysctl file
2823 * @buffer: the user buffer
2824 * @lenp: the size of the user buffer
2825 * @ppos: file position
2826 *
2827 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2828 * values from/to the user buffer, treated as an ASCII string. The values
2829 * are treated as milliseconds, and converted to jiffies when they are stored.
2830 *
2831 * This routine will ensure the values are within the range specified by
2832 * table->extra1 (min) and table->extra2 (max).
2833 *
2834 * Returns 0 on success.
2835 */
2836 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2837 void __user *buffer,
2838 size_t *lenp, loff_t *ppos)
2839 {
2840 return do_proc_doulongvec_minmax(table, write, buffer,
2841 lenp, ppos, HZ, 1000l);
2842 }
2843
2844
2845 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2846 int *valp,
2847 int write, void *data)
2848 {
2849 if (write) {
2850 if (*lvalp > INT_MAX / HZ)
2851 return 1;
2852 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2853 } else {
2854 int val = *valp;
2855 unsigned long lval;
2856 if (val < 0) {
2857 *negp = true;
2858 lval = -(unsigned long)val;
2859 } else {
2860 *negp = false;
2861 lval = (unsigned long)val;
2862 }
2863 *lvalp = lval / HZ;
2864 }
2865 return 0;
2866 }
2867
2868 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2869 int *valp,
2870 int write, void *data)
2871 {
2872 if (write) {
2873 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2874 return 1;
2875 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2876 } else {
2877 int val = *valp;
2878 unsigned long lval;
2879 if (val < 0) {
2880 *negp = true;
2881 lval = -(unsigned long)val;
2882 } else {
2883 *negp = false;
2884 lval = (unsigned long)val;
2885 }
2886 *lvalp = jiffies_to_clock_t(lval);
2887 }
2888 return 0;
2889 }
2890
2891 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2892 int *valp,
2893 int write, void *data)
2894 {
2895 if (write) {
2896 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2897
2898 if (jif > INT_MAX)
2899 return 1;
2900 *valp = (int)jif;
2901 } else {
2902 int val = *valp;
2903 unsigned long lval;
2904 if (val < 0) {
2905 *negp = true;
2906 lval = -(unsigned long)val;
2907 } else {
2908 *negp = false;
2909 lval = (unsigned long)val;
2910 }
2911 *lvalp = jiffies_to_msecs(lval);
2912 }
2913 return 0;
2914 }
2915
2916 /**
2917 * proc_dointvec_jiffies - read a vector of integers as seconds
2918 * @table: the sysctl table
2919 * @write: %TRUE if this is a write to the sysctl file
2920 * @buffer: the user buffer
2921 * @lenp: the size of the user buffer
2922 * @ppos: file position
2923 *
2924 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2925 * values from/to the user buffer, treated as an ASCII string.
2926 * The values read are assumed to be in seconds, and are converted into
2927 * jiffies.
2928 *
2929 * Returns 0 on success.
2930 */
2931 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2932 void __user *buffer, size_t *lenp, loff_t *ppos)
2933 {
2934 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2935 do_proc_dointvec_jiffies_conv,NULL);
2936 }
2937
2938 /**
2939 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2940 * @table: the sysctl table
2941 * @write: %TRUE if this is a write to the sysctl file
2942 * @buffer: the user buffer
2943 * @lenp: the size of the user buffer
2944 * @ppos: pointer to the file position
2945 *
2946 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2947 * values from/to the user buffer, treated as an ASCII string.
2948 * The values read are assumed to be in 1/USER_HZ seconds, and
2949 * are converted into jiffies.
2950 *
2951 * Returns 0 on success.
2952 */
2953 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2954 void __user *buffer, size_t *lenp, loff_t *ppos)
2955 {
2956 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2957 do_proc_dointvec_userhz_jiffies_conv,NULL);
2958 }
2959
2960 /**
2961 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2962 * @table: the sysctl table
2963 * @write: %TRUE if this is a write to the sysctl file
2964 * @buffer: the user buffer
2965 * @lenp: the size of the user buffer
2966 * @ppos: file position
2967 * @ppos: the current position in the file
2968 *
2969 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2970 * values from/to the user buffer, treated as an ASCII string.
2971 * The values read are assumed to be in 1/1000 seconds, and
2972 * are converted into jiffies.
2973 *
2974 * Returns 0 on success.
2975 */
2976 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2977 void __user *buffer, size_t *lenp, loff_t *ppos)
2978 {
2979 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2980 do_proc_dointvec_ms_jiffies_conv, NULL);
2981 }
2982
2983 static int proc_do_cad_pid(struct ctl_table *table, int write,
2984 void __user *buffer, size_t *lenp, loff_t *ppos)
2985 {
2986 struct pid *new_pid;
2987 pid_t tmp;
2988 int r;
2989
2990 tmp = pid_vnr(cad_pid);
2991
2992 r = __do_proc_dointvec(&tmp, table, write, buffer,
2993 lenp, ppos, NULL, NULL);
2994 if (r || !write)
2995 return r;
2996
2997 new_pid = find_get_pid(tmp);
2998 if (!new_pid)
2999 return -ESRCH;
3000
3001 put_pid(xchg(&cad_pid, new_pid));
3002 return 0;
3003 }
3004
3005 /**
3006 * proc_do_large_bitmap - read/write from/to a large bitmap
3007 * @table: the sysctl table
3008 * @write: %TRUE if this is a write to the sysctl file
3009 * @buffer: the user buffer
3010 * @lenp: the size of the user buffer
3011 * @ppos: file position
3012 *
3013 * The bitmap is stored at table->data and the bitmap length (in bits)
3014 * in table->maxlen.
3015 *
3016 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
3017 * large bitmaps may be represented in a compact manner. Writing into
3018 * the file will clear the bitmap then update it with the given input.
3019 *
3020 * Returns 0 on success.
3021 */
3022 int proc_do_large_bitmap(struct ctl_table *table, int write,
3023 void __user *buffer, size_t *lenp, loff_t *ppos)
3024 {
3025 int err = 0;
3026 bool first = 1;
3027 size_t left = *lenp;
3028 unsigned long bitmap_len = table->maxlen;
3029 unsigned long *bitmap = *(unsigned long **) table->data;
3030 unsigned long *tmp_bitmap = NULL;
3031 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
3032
3033 if (!bitmap || !bitmap_len || !left || (*ppos && !write)) {
3034 *lenp = 0;
3035 return 0;
3036 }
3037
3038 if (write) {
3039 char *kbuf, *p;
3040
3041 if (left > PAGE_SIZE - 1)
3042 left = PAGE_SIZE - 1;
3043
3044 p = kbuf = memdup_user_nul(buffer, left);
3045 if (IS_ERR(kbuf))
3046 return PTR_ERR(kbuf);
3047
3048 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
3049 GFP_KERNEL);
3050 if (!tmp_bitmap) {
3051 kfree(kbuf);
3052 return -ENOMEM;
3053 }
3054 proc_skip_char(&p, &left, '\n');
3055 while (!err && left) {
3056 unsigned long val_a, val_b;
3057 bool neg;
3058
3059 err = proc_get_long(&p, &left, &val_a, &neg, tr_a,
3060 sizeof(tr_a), &c);
3061 if (err)
3062 break;
3063 if (val_a >= bitmap_len || neg) {
3064 err = -EINVAL;
3065 break;
3066 }
3067
3068 val_b = val_a;
3069 if (left) {
3070 p++;
3071 left--;
3072 }
3073
3074 if (c == '-') {
3075 err = proc_get_long(&p, &left, &val_b,
3076 &neg, tr_b, sizeof(tr_b),
3077 &c);
3078 if (err)
3079 break;
3080 if (val_b >= bitmap_len || neg ||
3081 val_a > val_b) {
3082 err = -EINVAL;
3083 break;
3084 }
3085 if (left) {
3086 p++;
3087 left--;
3088 }
3089 }
3090
3091 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
3092 first = 0;
3093 proc_skip_char(&p, &left, '\n');
3094 }
3095 kfree(kbuf);
3096 } else {
3097 unsigned long bit_a, bit_b = 0;
3098
3099 while (left) {
3100 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
3101 if (bit_a >= bitmap_len)
3102 break;
3103 bit_b = find_next_zero_bit(bitmap, bitmap_len,
3104 bit_a + 1) - 1;
3105
3106 if (!first) {
3107 err = proc_put_char(&buffer, &left, ',');
3108 if (err)
3109 break;
3110 }
3111 err = proc_put_long(&buffer, &left, bit_a, false);
3112 if (err)
3113 break;
3114 if (bit_a != bit_b) {
3115 err = proc_put_char(&buffer, &left, '-');
3116 if (err)
3117 break;
3118 err = proc_put_long(&buffer, &left, bit_b, false);
3119 if (err)
3120 break;
3121 }
3122
3123 first = 0; bit_b++;
3124 }
3125 if (!err)
3126 err = proc_put_char(&buffer, &left, '\n');
3127 }
3128
3129 if (!err) {
3130 if (write) {
3131 if (*ppos)
3132 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
3133 else
3134 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
3135 }
3136 kfree(tmp_bitmap);
3137 *lenp -= left;
3138 *ppos += *lenp;
3139 return 0;
3140 } else {
3141 kfree(tmp_bitmap);
3142 return err;
3143 }
3144 }
3145
3146 #else /* CONFIG_PROC_SYSCTL */
3147
3148 int proc_dostring(struct ctl_table *table, int write,
3149 void __user *buffer, size_t *lenp, loff_t *ppos)
3150 {
3151 return -ENOSYS;
3152 }
3153
3154 int proc_dointvec(struct ctl_table *table, int write,
3155 void __user *buffer, size_t *lenp, loff_t *ppos)
3156 {
3157 return -ENOSYS;
3158 }
3159
3160 int proc_douintvec(struct ctl_table *table, int write,
3161 void __user *buffer, size_t *lenp, loff_t *ppos)
3162 {
3163 return -ENOSYS;
3164 }
3165
3166 int proc_dointvec_minmax(struct ctl_table *table, int write,
3167 void __user *buffer, size_t *lenp, loff_t *ppos)
3168 {
3169 return -ENOSYS;
3170 }
3171
3172 int proc_douintvec_minmax(struct ctl_table *table, int write,
3173 void __user *buffer, size_t *lenp, loff_t *ppos)
3174 {
3175 return -ENOSYS;
3176 }
3177
3178 int proc_dointvec_jiffies(struct ctl_table *table, int write,
3179 void __user *buffer, size_t *lenp, loff_t *ppos)
3180 {
3181 return -ENOSYS;
3182 }
3183
3184 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
3185 void __user *buffer, size_t *lenp, loff_t *ppos)
3186 {
3187 return -ENOSYS;
3188 }
3189
3190 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
3191 void __user *buffer, size_t *lenp, loff_t *ppos)
3192 {
3193 return -ENOSYS;
3194 }
3195
3196 int proc_doulongvec_minmax(struct ctl_table *table, int write,
3197 void __user *buffer, size_t *lenp, loff_t *ppos)
3198 {
3199 return -ENOSYS;
3200 }
3201
3202 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
3203 void __user *buffer,
3204 size_t *lenp, loff_t *ppos)
3205 {
3206 return -ENOSYS;
3207 }
3208
3209
3210 #endif /* CONFIG_PROC_SYSCTL */
3211
3212 /*
3213 * No sense putting this after each symbol definition, twice,
3214 * exception granted :-)
3215 */
3216 EXPORT_SYMBOL(proc_dointvec);
3217 EXPORT_SYMBOL(proc_douintvec);
3218 EXPORT_SYMBOL(proc_dointvec_jiffies);
3219 EXPORT_SYMBOL(proc_dointvec_minmax);
3220 EXPORT_SYMBOL_GPL(proc_douintvec_minmax);
3221 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
3222 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
3223 EXPORT_SYMBOL(proc_dostring);
3224 EXPORT_SYMBOL(proc_doulongvec_minmax);
3225 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);