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[mirror_ubuntu-bionic-kernel.git] / kernel / sysctl.c
1 /*
2 * sysctl.c: General linux system control interface
3 *
4 * Begun 24 March 1995, Stephen Tweedie
5 * Added /proc support, Dec 1995
6 * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
7 * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
8 * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
9 * Dynamic registration fixes, Stephen Tweedie.
10 * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
11 * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
12 * Horn.
13 * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
14 * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
15 * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
16 * Wendling.
17 * The list_for_each() macro wasn't appropriate for the sysctl loop.
18 * Removed it and replaced it with older style, 03/23/00, Bill Wendling
19 */
20
21 #include <linux/module.h>
22 #include <linux/aio.h>
23 #include <linux/mm.h>
24 #include <linux/swap.h>
25 #include <linux/slab.h>
26 #include <linux/sysctl.h>
27 #include <linux/bitmap.h>
28 #include <linux/signal.h>
29 #include <linux/printk.h>
30 #include <linux/proc_fs.h>
31 #include <linux/security.h>
32 #include <linux/ctype.h>
33 #include <linux/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 #include <linux/sched/coredump.h>
66 #include <linux/kexec.h>
67 #include <linux/bpf.h>
68 #include <linux/mount.h>
69 #include <linux/pipe_fs_i.h>
70
71 #include "../lib/kstrtox.h"
72
73 #include <linux/uaccess.h>
74 #include <asm/processor.h>
75
76 #ifdef CONFIG_X86
77 #include <asm/nmi.h>
78 #include <asm/stacktrace.h>
79 #include <asm/io.h>
80 #endif
81 #ifdef CONFIG_SPARC
82 #include <asm/setup.h>
83 #endif
84 #ifdef CONFIG_BSD_PROCESS_ACCT
85 #include <linux/acct.h>
86 #endif
87 #ifdef CONFIG_RT_MUTEXES
88 #include <linux/rtmutex.h>
89 #endif
90 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
91 #include <linux/lockdep.h>
92 #endif
93 #ifdef CONFIG_CHR_DEV_SG
94 #include <scsi/sg.h>
95 #endif
96
97 #ifdef CONFIG_LOCKUP_DETECTOR
98 #include <linux/nmi.h>
99 #endif
100
101 #if defined(CONFIG_SYSCTL)
102
103 /* External variables not in a header file. */
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 #ifdef CONFIG_USER_NS
111 extern int unprivileged_userns_clone;
112 #endif
113 extern int pid_max;
114 extern int pid_max_min, pid_max_max;
115 extern int percpu_pagelist_fraction;
116 extern int latencytop_enabled;
117 extern unsigned int sysctl_nr_open_min, sysctl_nr_open_max;
118 #ifndef CONFIG_MMU
119 extern int sysctl_nr_trim_pages;
120 #endif
121
122 /* Constants used for minimum and maximum */
123 #ifdef CONFIG_LOCKUP_DETECTOR
124 static int sixty = 60;
125 #endif
126
127 static int __maybe_unused neg_one = -1;
128
129 static int zero;
130 static int __maybe_unused one = 1;
131 static int __maybe_unused two = 2;
132 static int __maybe_unused four = 4;
133 static unsigned long zero_ul;
134 static unsigned long one_ul = 1;
135 static unsigned long long_max = LONG_MAX;
136 static int one_hundred = 100;
137 static int one_thousand = 1000;
138 #ifdef CONFIG_PRINTK
139 static int ten_thousand = 10000;
140 #endif
141 #ifdef CONFIG_PERF_EVENTS
142 static int six_hundred_forty_kb = 640 * 1024;
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
152 static int ngroups_max = NGROUPS_MAX;
153 static const int cap_last_cap = CAP_LAST_CAP;
154
155 /*this is needed for proc_doulongvec_minmax of sysctl_hung_task_timeout_secs */
156 #ifdef CONFIG_DETECT_HUNG_TASK
157 static unsigned long hung_task_timeout_max = (LONG_MAX/HZ);
158 #endif
159
160 #ifdef CONFIG_INOTIFY_USER
161 #include <linux/inotify.h>
162 #endif
163 #ifdef CONFIG_SPARC
164 #endif
165
166 #ifdef __hppa__
167 extern int pwrsw_enabled;
168 #endif
169
170 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
171 extern int unaligned_enabled;
172 #endif
173
174 #ifdef CONFIG_IA64
175 extern int unaligned_dump_stack;
176 #endif
177
178 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
179 extern int no_unaligned_warning;
180 #endif
181
182 #ifdef CONFIG_PROC_SYSCTL
183
184 /**
185 * enum sysctl_writes_mode - supported sysctl write modes
186 *
187 * @SYSCTL_WRITES_LEGACY: each write syscall must fully contain the sysctl value
188 * to be written, and multiple writes on the same sysctl file descriptor
189 * will rewrite the sysctl value, regardless of file position. No warning
190 * is issued when the initial position is not 0.
191 * @SYSCTL_WRITES_WARN: same as above but warn when the initial file position is
192 * not 0.
193 * @SYSCTL_WRITES_STRICT: writes to numeric sysctl entries must always be at
194 * file position 0 and the value must be fully contained in the buffer
195 * sent to the write syscall. If dealing with strings respect the file
196 * position, but restrict this to the max length of the buffer, anything
197 * passed the max lenght will be ignored. Multiple writes will append
198 * to the buffer.
199 *
200 * These write modes control how current file position affects the behavior of
201 * updating sysctl values through the proc interface on each write.
202 */
203 enum sysctl_writes_mode {
204 SYSCTL_WRITES_LEGACY = -1,
205 SYSCTL_WRITES_WARN = 0,
206 SYSCTL_WRITES_STRICT = 1,
207 };
208
209 static enum sysctl_writes_mode sysctl_writes_strict = SYSCTL_WRITES_STRICT;
210
211 static int proc_do_cad_pid(struct ctl_table *table, int write,
212 void __user *buffer, size_t *lenp, loff_t *ppos);
213 static int proc_taint(struct ctl_table *table, int write,
214 void __user *buffer, size_t *lenp, loff_t *ppos);
215 #endif
216
217 #ifdef CONFIG_PRINTK
218 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
219 void __user *buffer, size_t *lenp, loff_t *ppos);
220 #endif
221
222 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
223 void __user *buffer, size_t *lenp, loff_t *ppos);
224 #ifdef CONFIG_COREDUMP
225 static int proc_dostring_coredump(struct ctl_table *table, int write,
226 void __user *buffer, size_t *lenp, loff_t *ppos);
227 #endif
228
229 #ifdef CONFIG_MAGIC_SYSRQ
230 /* Note: sysrq code uses it's own private copy */
231 static int __sysrq_enabled = CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE;
232
233 static int sysrq_sysctl_handler(struct ctl_table *table, int write,
234 void __user *buffer, size_t *lenp,
235 loff_t *ppos)
236 {
237 int error;
238
239 error = proc_dointvec(table, write, buffer, lenp, ppos);
240 if (error)
241 return error;
242
243 if (write)
244 sysrq_toggle_support(__sysrq_enabled);
245
246 return 0;
247 }
248
249 #endif
250
251 static struct ctl_table kern_table[];
252 static struct ctl_table vm_table[];
253 static struct ctl_table fs_table[];
254 static struct ctl_table debug_table[];
255 static struct ctl_table dev_table[];
256 extern struct ctl_table random_table[];
257 #ifdef CONFIG_EPOLL
258 extern struct ctl_table epoll_table[];
259 #endif
260
261 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
262 int sysctl_legacy_va_layout;
263 #endif
264
265 /* The default sysctl tables: */
266
267 static struct ctl_table sysctl_base_table[] = {
268 {
269 .procname = "kernel",
270 .mode = 0555,
271 .child = kern_table,
272 },
273 {
274 .procname = "vm",
275 .mode = 0555,
276 .child = vm_table,
277 },
278 {
279 .procname = "fs",
280 .mode = 0555,
281 .child = fs_table,
282 },
283 {
284 .procname = "debug",
285 .mode = 0555,
286 .child = debug_table,
287 },
288 {
289 .procname = "dev",
290 .mode = 0555,
291 .child = dev_table,
292 },
293 { }
294 };
295
296 #ifdef CONFIG_SCHED_DEBUG
297 static int min_sched_granularity_ns = 100000; /* 100 usecs */
298 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
299 static int min_wakeup_granularity_ns; /* 0 usecs */
300 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
301 #ifdef CONFIG_SMP
302 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
303 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
304 #endif /* CONFIG_SMP */
305 #endif /* CONFIG_SCHED_DEBUG */
306
307 #ifdef CONFIG_COMPACTION
308 static int min_extfrag_threshold;
309 static int max_extfrag_threshold = 1000;
310 #endif
311
312 static struct ctl_table kern_table[] = {
313 {
314 .procname = "sched_child_runs_first",
315 .data = &sysctl_sched_child_runs_first,
316 .maxlen = sizeof(unsigned int),
317 .mode = 0644,
318 .proc_handler = proc_dointvec,
319 },
320 #ifdef CONFIG_SCHED_DEBUG
321 {
322 .procname = "sched_min_granularity_ns",
323 .data = &sysctl_sched_min_granularity,
324 .maxlen = sizeof(unsigned int),
325 .mode = 0644,
326 .proc_handler = sched_proc_update_handler,
327 .extra1 = &min_sched_granularity_ns,
328 .extra2 = &max_sched_granularity_ns,
329 },
330 {
331 .procname = "sched_latency_ns",
332 .data = &sysctl_sched_latency,
333 .maxlen = sizeof(unsigned int),
334 .mode = 0644,
335 .proc_handler = sched_proc_update_handler,
336 .extra1 = &min_sched_granularity_ns,
337 .extra2 = &max_sched_granularity_ns,
338 },
339 {
340 .procname = "sched_wakeup_granularity_ns",
341 .data = &sysctl_sched_wakeup_granularity,
342 .maxlen = sizeof(unsigned int),
343 .mode = 0644,
344 .proc_handler = sched_proc_update_handler,
345 .extra1 = &min_wakeup_granularity_ns,
346 .extra2 = &max_wakeup_granularity_ns,
347 },
348 #ifdef CONFIG_SMP
349 {
350 .procname = "sched_tunable_scaling",
351 .data = &sysctl_sched_tunable_scaling,
352 .maxlen = sizeof(enum sched_tunable_scaling),
353 .mode = 0644,
354 .proc_handler = sched_proc_update_handler,
355 .extra1 = &min_sched_tunable_scaling,
356 .extra2 = &max_sched_tunable_scaling,
357 },
358 {
359 .procname = "sched_migration_cost_ns",
360 .data = &sysctl_sched_migration_cost,
361 .maxlen = sizeof(unsigned int),
362 .mode = 0644,
363 .proc_handler = proc_dointvec,
364 },
365 {
366 .procname = "sched_nr_migrate",
367 .data = &sysctl_sched_nr_migrate,
368 .maxlen = sizeof(unsigned int),
369 .mode = 0644,
370 .proc_handler = proc_dointvec,
371 },
372 {
373 .procname = "sched_time_avg_ms",
374 .data = &sysctl_sched_time_avg,
375 .maxlen = sizeof(unsigned int),
376 .mode = 0644,
377 .proc_handler = proc_dointvec_minmax,
378 .extra1 = &one,
379 },
380 #ifdef CONFIG_SCHEDSTATS
381 {
382 .procname = "sched_schedstats",
383 .data = NULL,
384 .maxlen = sizeof(unsigned int),
385 .mode = 0644,
386 .proc_handler = sysctl_schedstats,
387 .extra1 = &zero,
388 .extra2 = &one,
389 },
390 #endif /* CONFIG_SCHEDSTATS */
391 #endif /* CONFIG_SMP */
392 #ifdef CONFIG_NUMA_BALANCING
393 {
394 .procname = "numa_balancing_scan_delay_ms",
395 .data = &sysctl_numa_balancing_scan_delay,
396 .maxlen = sizeof(unsigned int),
397 .mode = 0644,
398 .proc_handler = proc_dointvec,
399 },
400 {
401 .procname = "numa_balancing_scan_period_min_ms",
402 .data = &sysctl_numa_balancing_scan_period_min,
403 .maxlen = sizeof(unsigned int),
404 .mode = 0644,
405 .proc_handler = proc_dointvec,
406 },
407 {
408 .procname = "numa_balancing_scan_period_max_ms",
409 .data = &sysctl_numa_balancing_scan_period_max,
410 .maxlen = sizeof(unsigned int),
411 .mode = 0644,
412 .proc_handler = proc_dointvec,
413 },
414 {
415 .procname = "numa_balancing_scan_size_mb",
416 .data = &sysctl_numa_balancing_scan_size,
417 .maxlen = sizeof(unsigned int),
418 .mode = 0644,
419 .proc_handler = proc_dointvec_minmax,
420 .extra1 = &one,
421 },
422 {
423 .procname = "numa_balancing",
424 .data = NULL, /* filled in by handler */
425 .maxlen = sizeof(unsigned int),
426 .mode = 0644,
427 .proc_handler = sysctl_numa_balancing,
428 .extra1 = &zero,
429 .extra2 = &one,
430 },
431 #endif /* CONFIG_NUMA_BALANCING */
432 #endif /* CONFIG_SCHED_DEBUG */
433 {
434 .procname = "sched_rt_period_us",
435 .data = &sysctl_sched_rt_period,
436 .maxlen = sizeof(unsigned int),
437 .mode = 0644,
438 .proc_handler = sched_rt_handler,
439 },
440 {
441 .procname = "sched_rt_runtime_us",
442 .data = &sysctl_sched_rt_runtime,
443 .maxlen = sizeof(int),
444 .mode = 0644,
445 .proc_handler = sched_rt_handler,
446 },
447 {
448 .procname = "sched_rr_timeslice_ms",
449 .data = &sysctl_sched_rr_timeslice,
450 .maxlen = sizeof(int),
451 .mode = 0644,
452 .proc_handler = sched_rr_handler,
453 },
454 #ifdef CONFIG_SCHED_AUTOGROUP
455 {
456 .procname = "sched_autogroup_enabled",
457 .data = &sysctl_sched_autogroup_enabled,
458 .maxlen = sizeof(unsigned int),
459 .mode = 0644,
460 .proc_handler = proc_dointvec_minmax,
461 .extra1 = &zero,
462 .extra2 = &one,
463 },
464 #endif
465 #ifdef CONFIG_CFS_BANDWIDTH
466 {
467 .procname = "sched_cfs_bandwidth_slice_us",
468 .data = &sysctl_sched_cfs_bandwidth_slice,
469 .maxlen = sizeof(unsigned int),
470 .mode = 0644,
471 .proc_handler = proc_dointvec_minmax,
472 .extra1 = &one,
473 },
474 #endif
475 #ifdef CONFIG_PROVE_LOCKING
476 {
477 .procname = "prove_locking",
478 .data = &prove_locking,
479 .maxlen = sizeof(int),
480 .mode = 0644,
481 .proc_handler = proc_dointvec,
482 },
483 #endif
484 #ifdef CONFIG_LOCK_STAT
485 {
486 .procname = "lock_stat",
487 .data = &lock_stat,
488 .maxlen = sizeof(int),
489 .mode = 0644,
490 .proc_handler = proc_dointvec,
491 },
492 #endif
493 {
494 .procname = "panic",
495 .data = &panic_timeout,
496 .maxlen = sizeof(int),
497 .mode = 0644,
498 .proc_handler = proc_dointvec,
499 },
500 #ifdef CONFIG_COREDUMP
501 {
502 .procname = "core_uses_pid",
503 .data = &core_uses_pid,
504 .maxlen = sizeof(int),
505 .mode = 0644,
506 .proc_handler = proc_dointvec,
507 },
508 {
509 .procname = "core_pattern",
510 .data = core_pattern,
511 .maxlen = CORENAME_MAX_SIZE,
512 .mode = 0644,
513 .proc_handler = proc_dostring_coredump,
514 },
515 {
516 .procname = "core_pipe_limit",
517 .data = &core_pipe_limit,
518 .maxlen = sizeof(unsigned int),
519 .mode = 0644,
520 .proc_handler = proc_dointvec,
521 },
522 #endif
523 #ifdef CONFIG_USER_NS
524 {
525 .procname = "unprivileged_userns_clone",
526 .data = &unprivileged_userns_clone,
527 .maxlen = sizeof(int),
528 .mode = 0644,
529 .proc_handler = proc_dointvec,
530 },
531 #endif
532 #ifdef CONFIG_PROC_SYSCTL
533 {
534 .procname = "tainted",
535 .maxlen = sizeof(long),
536 .mode = 0644,
537 .proc_handler = proc_taint,
538 },
539 {
540 .procname = "sysctl_writes_strict",
541 .data = &sysctl_writes_strict,
542 .maxlen = sizeof(int),
543 .mode = 0644,
544 .proc_handler = proc_dointvec_minmax,
545 .extra1 = &neg_one,
546 .extra2 = &one,
547 },
548 #endif
549 #ifdef CONFIG_LATENCYTOP
550 {
551 .procname = "latencytop",
552 .data = &latencytop_enabled,
553 .maxlen = sizeof(int),
554 .mode = 0644,
555 .proc_handler = sysctl_latencytop,
556 },
557 #endif
558 #ifdef CONFIG_BLK_DEV_INITRD
559 {
560 .procname = "real-root-dev",
561 .data = &real_root_dev,
562 .maxlen = sizeof(int),
563 .mode = 0644,
564 .proc_handler = proc_dointvec,
565 },
566 #endif
567 {
568 .procname = "print-fatal-signals",
569 .data = &print_fatal_signals,
570 .maxlen = sizeof(int),
571 .mode = 0644,
572 .proc_handler = proc_dointvec,
573 },
574 #ifdef CONFIG_SPARC
575 {
576 .procname = "reboot-cmd",
577 .data = reboot_command,
578 .maxlen = 256,
579 .mode = 0644,
580 .proc_handler = proc_dostring,
581 },
582 {
583 .procname = "stop-a",
584 .data = &stop_a_enabled,
585 .maxlen = sizeof (int),
586 .mode = 0644,
587 .proc_handler = proc_dointvec,
588 },
589 {
590 .procname = "scons-poweroff",
591 .data = &scons_pwroff,
592 .maxlen = sizeof (int),
593 .mode = 0644,
594 .proc_handler = proc_dointvec,
595 },
596 #endif
597 #ifdef CONFIG_SPARC64
598 {
599 .procname = "tsb-ratio",
600 .data = &sysctl_tsb_ratio,
601 .maxlen = sizeof (int),
602 .mode = 0644,
603 .proc_handler = proc_dointvec,
604 },
605 #endif
606 #ifdef __hppa__
607 {
608 .procname = "soft-power",
609 .data = &pwrsw_enabled,
610 .maxlen = sizeof (int),
611 .mode = 0644,
612 .proc_handler = proc_dointvec,
613 },
614 #endif
615 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
616 {
617 .procname = "unaligned-trap",
618 .data = &unaligned_enabled,
619 .maxlen = sizeof (int),
620 .mode = 0644,
621 .proc_handler = proc_dointvec,
622 },
623 #endif
624 {
625 .procname = "ctrl-alt-del",
626 .data = &C_A_D,
627 .maxlen = sizeof(int),
628 .mode = 0644,
629 .proc_handler = proc_dointvec,
630 },
631 #ifdef CONFIG_FUNCTION_TRACER
632 {
633 .procname = "ftrace_enabled",
634 .data = &ftrace_enabled,
635 .maxlen = sizeof(int),
636 .mode = 0644,
637 .proc_handler = ftrace_enable_sysctl,
638 },
639 #endif
640 #ifdef CONFIG_STACK_TRACER
641 {
642 .procname = "stack_tracer_enabled",
643 .data = &stack_tracer_enabled,
644 .maxlen = sizeof(int),
645 .mode = 0644,
646 .proc_handler = stack_trace_sysctl,
647 },
648 #endif
649 #ifdef CONFIG_TRACING
650 {
651 .procname = "ftrace_dump_on_oops",
652 .data = &ftrace_dump_on_oops,
653 .maxlen = sizeof(int),
654 .mode = 0644,
655 .proc_handler = proc_dointvec,
656 },
657 {
658 .procname = "traceoff_on_warning",
659 .data = &__disable_trace_on_warning,
660 .maxlen = sizeof(__disable_trace_on_warning),
661 .mode = 0644,
662 .proc_handler = proc_dointvec,
663 },
664 {
665 .procname = "tracepoint_printk",
666 .data = &tracepoint_printk,
667 .maxlen = sizeof(tracepoint_printk),
668 .mode = 0644,
669 .proc_handler = tracepoint_printk_sysctl,
670 },
671 #endif
672 #ifdef CONFIG_KEXEC_CORE
673 {
674 .procname = "kexec_load_disabled",
675 .data = &kexec_load_disabled,
676 .maxlen = sizeof(int),
677 .mode = 0644,
678 /* only handle a transition from default "0" to "1" */
679 .proc_handler = proc_dointvec_minmax,
680 .extra1 = &one,
681 .extra2 = &one,
682 },
683 #endif
684 #ifdef CONFIG_MODULES
685 {
686 .procname = "modprobe",
687 .data = &modprobe_path,
688 .maxlen = KMOD_PATH_LEN,
689 .mode = 0644,
690 .proc_handler = proc_dostring,
691 },
692 {
693 .procname = "modules_disabled",
694 .data = &modules_disabled,
695 .maxlen = sizeof(int),
696 .mode = 0644,
697 /* only handle a transition from default "0" to "1" */
698 .proc_handler = proc_dointvec_minmax,
699 .extra1 = &one,
700 .extra2 = &one,
701 },
702 #endif
703 #ifdef CONFIG_UEVENT_HELPER
704 {
705 .procname = "hotplug",
706 .data = &uevent_helper,
707 .maxlen = UEVENT_HELPER_PATH_LEN,
708 .mode = 0644,
709 .proc_handler = proc_dostring,
710 },
711 #endif
712 #ifdef CONFIG_CHR_DEV_SG
713 {
714 .procname = "sg-big-buff",
715 .data = &sg_big_buff,
716 .maxlen = sizeof (int),
717 .mode = 0444,
718 .proc_handler = proc_dointvec,
719 },
720 #endif
721 #ifdef CONFIG_BSD_PROCESS_ACCT
722 {
723 .procname = "acct",
724 .data = &acct_parm,
725 .maxlen = 3*sizeof(int),
726 .mode = 0644,
727 .proc_handler = proc_dointvec,
728 },
729 #endif
730 #ifdef CONFIG_MAGIC_SYSRQ
731 {
732 .procname = "sysrq",
733 .data = &__sysrq_enabled,
734 .maxlen = sizeof (int),
735 .mode = 0644,
736 .proc_handler = sysrq_sysctl_handler,
737 },
738 #endif
739 #ifdef CONFIG_PROC_SYSCTL
740 {
741 .procname = "cad_pid",
742 .data = NULL,
743 .maxlen = sizeof (int),
744 .mode = 0600,
745 .proc_handler = proc_do_cad_pid,
746 },
747 #endif
748 {
749 .procname = "threads-max",
750 .data = NULL,
751 .maxlen = sizeof(int),
752 .mode = 0644,
753 .proc_handler = sysctl_max_threads,
754 },
755 {
756 .procname = "random",
757 .mode = 0555,
758 .child = random_table,
759 },
760 {
761 .procname = "usermodehelper",
762 .mode = 0555,
763 .child = usermodehelper_table,
764 },
765 {
766 .procname = "overflowuid",
767 .data = &overflowuid,
768 .maxlen = sizeof(int),
769 .mode = 0644,
770 .proc_handler = proc_dointvec_minmax,
771 .extra1 = &minolduid,
772 .extra2 = &maxolduid,
773 },
774 {
775 .procname = "overflowgid",
776 .data = &overflowgid,
777 .maxlen = sizeof(int),
778 .mode = 0644,
779 .proc_handler = proc_dointvec_minmax,
780 .extra1 = &minolduid,
781 .extra2 = &maxolduid,
782 },
783 #ifdef CONFIG_S390
784 #ifdef CONFIG_MATHEMU
785 {
786 .procname = "ieee_emulation_warnings",
787 .data = &sysctl_ieee_emulation_warnings,
788 .maxlen = sizeof(int),
789 .mode = 0644,
790 .proc_handler = proc_dointvec,
791 },
792 #endif
793 {
794 .procname = "userprocess_debug",
795 .data = &show_unhandled_signals,
796 .maxlen = sizeof(int),
797 .mode = 0644,
798 .proc_handler = proc_dointvec,
799 },
800 #endif
801 {
802 .procname = "pid_max",
803 .data = &pid_max,
804 .maxlen = sizeof (int),
805 .mode = 0644,
806 .proc_handler = proc_dointvec_minmax,
807 .extra1 = &pid_max_min,
808 .extra2 = &pid_max_max,
809 },
810 {
811 .procname = "panic_on_oops",
812 .data = &panic_on_oops,
813 .maxlen = sizeof(int),
814 .mode = 0644,
815 .proc_handler = proc_dointvec,
816 },
817 #if defined CONFIG_PRINTK
818 {
819 .procname = "printk",
820 .data = &console_loglevel,
821 .maxlen = 4*sizeof(int),
822 .mode = 0644,
823 .proc_handler = proc_dointvec,
824 },
825 {
826 .procname = "printk_ratelimit",
827 .data = &printk_ratelimit_state.interval,
828 .maxlen = sizeof(int),
829 .mode = 0644,
830 .proc_handler = proc_dointvec_jiffies,
831 },
832 {
833 .procname = "printk_ratelimit_burst",
834 .data = &printk_ratelimit_state.burst,
835 .maxlen = sizeof(int),
836 .mode = 0644,
837 .proc_handler = proc_dointvec,
838 },
839 {
840 .procname = "printk_delay",
841 .data = &printk_delay_msec,
842 .maxlen = sizeof(int),
843 .mode = 0644,
844 .proc_handler = proc_dointvec_minmax,
845 .extra1 = &zero,
846 .extra2 = &ten_thousand,
847 },
848 {
849 .procname = "printk_devkmsg",
850 .data = devkmsg_log_str,
851 .maxlen = DEVKMSG_STR_MAX_SIZE,
852 .mode = 0644,
853 .proc_handler = devkmsg_sysctl_set_loglvl,
854 },
855 {
856 .procname = "dmesg_restrict",
857 .data = &dmesg_restrict,
858 .maxlen = sizeof(int),
859 .mode = 0644,
860 .proc_handler = proc_dointvec_minmax_sysadmin,
861 .extra1 = &zero,
862 .extra2 = &one,
863 },
864 {
865 .procname = "kptr_restrict",
866 .data = &kptr_restrict,
867 .maxlen = sizeof(int),
868 .mode = 0644,
869 .proc_handler = proc_dointvec_minmax_sysadmin,
870 .extra1 = &zero,
871 .extra2 = &two,
872 },
873 #endif
874 {
875 .procname = "ngroups_max",
876 .data = &ngroups_max,
877 .maxlen = sizeof (int),
878 .mode = 0444,
879 .proc_handler = proc_dointvec,
880 },
881 {
882 .procname = "cap_last_cap",
883 .data = (void *)&cap_last_cap,
884 .maxlen = sizeof(int),
885 .mode = 0444,
886 .proc_handler = proc_dointvec,
887 },
888 #if defined(CONFIG_LOCKUP_DETECTOR)
889 {
890 .procname = "watchdog",
891 .data = &watchdog_user_enabled,
892 .maxlen = sizeof(int),
893 .mode = 0644,
894 .proc_handler = proc_watchdog,
895 .extra1 = &zero,
896 .extra2 = &one,
897 },
898 {
899 .procname = "watchdog_thresh",
900 .data = &watchdog_thresh,
901 .maxlen = sizeof(int),
902 .mode = 0644,
903 .proc_handler = proc_watchdog_thresh,
904 .extra1 = &zero,
905 .extra2 = &sixty,
906 },
907 {
908 .procname = "nmi_watchdog",
909 .data = &nmi_watchdog_user_enabled,
910 .maxlen = sizeof(int),
911 .mode = NMI_WATCHDOG_SYSCTL_PERM,
912 .proc_handler = proc_nmi_watchdog,
913 .extra1 = &zero,
914 .extra2 = &one,
915 },
916 {
917 .procname = "watchdog_cpumask",
918 .data = &watchdog_cpumask_bits,
919 .maxlen = NR_CPUS,
920 .mode = 0644,
921 .proc_handler = proc_watchdog_cpumask,
922 },
923 #ifdef CONFIG_SOFTLOCKUP_DETECTOR
924 {
925 .procname = "soft_watchdog",
926 .data = &soft_watchdog_user_enabled,
927 .maxlen = sizeof(int),
928 .mode = 0644,
929 .proc_handler = proc_soft_watchdog,
930 .extra1 = &zero,
931 .extra2 = &one,
932 },
933 {
934 .procname = "softlockup_panic",
935 .data = &softlockup_panic,
936 .maxlen = sizeof(int),
937 .mode = 0644,
938 .proc_handler = proc_dointvec_minmax,
939 .extra1 = &zero,
940 .extra2 = &one,
941 },
942 #ifdef CONFIG_SMP
943 {
944 .procname = "softlockup_all_cpu_backtrace",
945 .data = &sysctl_softlockup_all_cpu_backtrace,
946 .maxlen = sizeof(int),
947 .mode = 0644,
948 .proc_handler = proc_dointvec_minmax,
949 .extra1 = &zero,
950 .extra2 = &one,
951 },
952 #endif /* CONFIG_SMP */
953 #endif
954 #ifdef CONFIG_HARDLOCKUP_DETECTOR
955 {
956 .procname = "hardlockup_panic",
957 .data = &hardlockup_panic,
958 .maxlen = sizeof(int),
959 .mode = 0644,
960 .proc_handler = proc_dointvec_minmax,
961 .extra1 = &zero,
962 .extra2 = &one,
963 },
964 #ifdef CONFIG_SMP
965 {
966 .procname = "hardlockup_all_cpu_backtrace",
967 .data = &sysctl_hardlockup_all_cpu_backtrace,
968 .maxlen = sizeof(int),
969 .mode = 0644,
970 .proc_handler = proc_dointvec_minmax,
971 .extra1 = &zero,
972 .extra2 = &one,
973 },
974 #endif /* CONFIG_SMP */
975 #endif
976 #endif
977
978 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
979 {
980 .procname = "unknown_nmi_panic",
981 .data = &unknown_nmi_panic,
982 .maxlen = sizeof (int),
983 .mode = 0644,
984 .proc_handler = proc_dointvec,
985 },
986 #endif
987 #if defined(CONFIG_X86)
988 {
989 .procname = "panic_on_unrecovered_nmi",
990 .data = &panic_on_unrecovered_nmi,
991 .maxlen = sizeof(int),
992 .mode = 0644,
993 .proc_handler = proc_dointvec,
994 },
995 {
996 .procname = "panic_on_io_nmi",
997 .data = &panic_on_io_nmi,
998 .maxlen = sizeof(int),
999 .mode = 0644,
1000 .proc_handler = proc_dointvec,
1001 },
1002 #ifdef CONFIG_DEBUG_STACKOVERFLOW
1003 {
1004 .procname = "panic_on_stackoverflow",
1005 .data = &sysctl_panic_on_stackoverflow,
1006 .maxlen = sizeof(int),
1007 .mode = 0644,
1008 .proc_handler = proc_dointvec,
1009 },
1010 #endif
1011 {
1012 .procname = "bootloader_type",
1013 .data = &bootloader_type,
1014 .maxlen = sizeof (int),
1015 .mode = 0444,
1016 .proc_handler = proc_dointvec,
1017 },
1018 {
1019 .procname = "bootloader_version",
1020 .data = &bootloader_version,
1021 .maxlen = sizeof (int),
1022 .mode = 0444,
1023 .proc_handler = proc_dointvec,
1024 },
1025 {
1026 .procname = "io_delay_type",
1027 .data = &io_delay_type,
1028 .maxlen = sizeof(int),
1029 .mode = 0644,
1030 .proc_handler = proc_dointvec,
1031 },
1032 #endif
1033 #if defined(CONFIG_MMU)
1034 {
1035 .procname = "randomize_va_space",
1036 .data = &randomize_va_space,
1037 .maxlen = sizeof(int),
1038 .mode = 0644,
1039 .proc_handler = proc_dointvec,
1040 },
1041 #endif
1042 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
1043 {
1044 .procname = "spin_retry",
1045 .data = &spin_retry,
1046 .maxlen = sizeof (int),
1047 .mode = 0644,
1048 .proc_handler = proc_dointvec,
1049 },
1050 #endif
1051 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
1052 {
1053 .procname = "acpi_video_flags",
1054 .data = &acpi_realmode_flags,
1055 .maxlen = sizeof (unsigned long),
1056 .mode = 0644,
1057 .proc_handler = proc_doulongvec_minmax,
1058 },
1059 #endif
1060 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
1061 {
1062 .procname = "ignore-unaligned-usertrap",
1063 .data = &no_unaligned_warning,
1064 .maxlen = sizeof (int),
1065 .mode = 0644,
1066 .proc_handler = proc_dointvec,
1067 },
1068 #endif
1069 #ifdef CONFIG_IA64
1070 {
1071 .procname = "unaligned-dump-stack",
1072 .data = &unaligned_dump_stack,
1073 .maxlen = sizeof (int),
1074 .mode = 0644,
1075 .proc_handler = proc_dointvec,
1076 },
1077 #endif
1078 #ifdef CONFIG_DETECT_HUNG_TASK
1079 {
1080 .procname = "hung_task_panic",
1081 .data = &sysctl_hung_task_panic,
1082 .maxlen = sizeof(int),
1083 .mode = 0644,
1084 .proc_handler = proc_dointvec_minmax,
1085 .extra1 = &zero,
1086 .extra2 = &one,
1087 },
1088 {
1089 .procname = "hung_task_check_count",
1090 .data = &sysctl_hung_task_check_count,
1091 .maxlen = sizeof(int),
1092 .mode = 0644,
1093 .proc_handler = proc_dointvec_minmax,
1094 .extra1 = &zero,
1095 },
1096 {
1097 .procname = "hung_task_timeout_secs",
1098 .data = &sysctl_hung_task_timeout_secs,
1099 .maxlen = sizeof(unsigned long),
1100 .mode = 0644,
1101 .proc_handler = proc_dohung_task_timeout_secs,
1102 .extra2 = &hung_task_timeout_max,
1103 },
1104 {
1105 .procname = "hung_task_warnings",
1106 .data = &sysctl_hung_task_warnings,
1107 .maxlen = sizeof(int),
1108 .mode = 0644,
1109 .proc_handler = proc_dointvec_minmax,
1110 .extra1 = &neg_one,
1111 },
1112 #endif
1113 #ifdef CONFIG_RT_MUTEXES
1114 {
1115 .procname = "max_lock_depth",
1116 .data = &max_lock_depth,
1117 .maxlen = sizeof(int),
1118 .mode = 0644,
1119 .proc_handler = proc_dointvec,
1120 },
1121 #endif
1122 {
1123 .procname = "poweroff_cmd",
1124 .data = &poweroff_cmd,
1125 .maxlen = POWEROFF_CMD_PATH_LEN,
1126 .mode = 0644,
1127 .proc_handler = proc_dostring,
1128 },
1129 #ifdef CONFIG_KEYS
1130 {
1131 .procname = "keys",
1132 .mode = 0555,
1133 .child = key_sysctls,
1134 },
1135 #endif
1136 #ifdef CONFIG_PERF_EVENTS
1137 /*
1138 * User-space scripts rely on the existence of this file
1139 * as a feature check for perf_events being enabled.
1140 *
1141 * So it's an ABI, do not remove!
1142 */
1143 {
1144 .procname = "perf_event_paranoid",
1145 .data = &sysctl_perf_event_paranoid,
1146 .maxlen = sizeof(sysctl_perf_event_paranoid),
1147 .mode = 0644,
1148 .proc_handler = proc_dointvec,
1149 },
1150 {
1151 .procname = "perf_event_mlock_kb",
1152 .data = &sysctl_perf_event_mlock,
1153 .maxlen = sizeof(sysctl_perf_event_mlock),
1154 .mode = 0644,
1155 .proc_handler = proc_dointvec,
1156 },
1157 {
1158 .procname = "perf_event_max_sample_rate",
1159 .data = &sysctl_perf_event_sample_rate,
1160 .maxlen = sizeof(sysctl_perf_event_sample_rate),
1161 .mode = 0644,
1162 .proc_handler = perf_proc_update_handler,
1163 .extra1 = &one,
1164 },
1165 {
1166 .procname = "perf_cpu_time_max_percent",
1167 .data = &sysctl_perf_cpu_time_max_percent,
1168 .maxlen = sizeof(sysctl_perf_cpu_time_max_percent),
1169 .mode = 0644,
1170 .proc_handler = perf_cpu_time_max_percent_handler,
1171 .extra1 = &zero,
1172 .extra2 = &one_hundred,
1173 },
1174 {
1175 .procname = "perf_event_max_stack",
1176 .data = &sysctl_perf_event_max_stack,
1177 .maxlen = sizeof(sysctl_perf_event_max_stack),
1178 .mode = 0644,
1179 .proc_handler = perf_event_max_stack_handler,
1180 .extra1 = &zero,
1181 .extra2 = &six_hundred_forty_kb,
1182 },
1183 {
1184 .procname = "perf_event_max_contexts_per_stack",
1185 .data = &sysctl_perf_event_max_contexts_per_stack,
1186 .maxlen = sizeof(sysctl_perf_event_max_contexts_per_stack),
1187 .mode = 0644,
1188 .proc_handler = perf_event_max_stack_handler,
1189 .extra1 = &zero,
1190 .extra2 = &one_thousand,
1191 },
1192 #endif
1193 {
1194 .procname = "panic_on_warn",
1195 .data = &panic_on_warn,
1196 .maxlen = sizeof(int),
1197 .mode = 0644,
1198 .proc_handler = proc_dointvec_minmax,
1199 .extra1 = &zero,
1200 .extra2 = &one,
1201 },
1202 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
1203 {
1204 .procname = "timer_migration",
1205 .data = &sysctl_timer_migration,
1206 .maxlen = sizeof(unsigned int),
1207 .mode = 0644,
1208 .proc_handler = timer_migration_handler,
1209 .extra1 = &zero,
1210 .extra2 = &one,
1211 },
1212 #endif
1213 #ifdef CONFIG_BPF_SYSCALL
1214 {
1215 .procname = "unprivileged_bpf_disabled",
1216 .data = &sysctl_unprivileged_bpf_disabled,
1217 .maxlen = sizeof(sysctl_unprivileged_bpf_disabled),
1218 .mode = 0644,
1219 /* only handle a transition from default "0" to "1" */
1220 .proc_handler = proc_dointvec_minmax,
1221 .extra1 = &one,
1222 .extra2 = &one,
1223 },
1224 #endif
1225 #if defined(CONFIG_TREE_RCU) || defined(CONFIG_PREEMPT_RCU)
1226 {
1227 .procname = "panic_on_rcu_stall",
1228 .data = &sysctl_panic_on_rcu_stall,
1229 .maxlen = sizeof(sysctl_panic_on_rcu_stall),
1230 .mode = 0644,
1231 .proc_handler = proc_dointvec_minmax,
1232 .extra1 = &zero,
1233 .extra2 = &one,
1234 },
1235 #endif
1236 { }
1237 };
1238
1239 static struct ctl_table vm_table[] = {
1240 {
1241 .procname = "overcommit_memory",
1242 .data = &sysctl_overcommit_memory,
1243 .maxlen = sizeof(sysctl_overcommit_memory),
1244 .mode = 0644,
1245 .proc_handler = proc_dointvec_minmax,
1246 .extra1 = &zero,
1247 .extra2 = &two,
1248 },
1249 {
1250 .procname = "panic_on_oom",
1251 .data = &sysctl_panic_on_oom,
1252 .maxlen = sizeof(sysctl_panic_on_oom),
1253 .mode = 0644,
1254 .proc_handler = proc_dointvec_minmax,
1255 .extra1 = &zero,
1256 .extra2 = &two,
1257 },
1258 {
1259 .procname = "oom_kill_allocating_task",
1260 .data = &sysctl_oom_kill_allocating_task,
1261 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1262 .mode = 0644,
1263 .proc_handler = proc_dointvec,
1264 },
1265 {
1266 .procname = "oom_dump_tasks",
1267 .data = &sysctl_oom_dump_tasks,
1268 .maxlen = sizeof(sysctl_oom_dump_tasks),
1269 .mode = 0644,
1270 .proc_handler = proc_dointvec,
1271 },
1272 {
1273 .procname = "overcommit_ratio",
1274 .data = &sysctl_overcommit_ratio,
1275 .maxlen = sizeof(sysctl_overcommit_ratio),
1276 .mode = 0644,
1277 .proc_handler = overcommit_ratio_handler,
1278 },
1279 {
1280 .procname = "overcommit_kbytes",
1281 .data = &sysctl_overcommit_kbytes,
1282 .maxlen = sizeof(sysctl_overcommit_kbytes),
1283 .mode = 0644,
1284 .proc_handler = overcommit_kbytes_handler,
1285 },
1286 {
1287 .procname = "page-cluster",
1288 .data = &page_cluster,
1289 .maxlen = sizeof(int),
1290 .mode = 0644,
1291 .proc_handler = proc_dointvec_minmax,
1292 .extra1 = &zero,
1293 },
1294 {
1295 .procname = "dirty_background_ratio",
1296 .data = &dirty_background_ratio,
1297 .maxlen = sizeof(dirty_background_ratio),
1298 .mode = 0644,
1299 .proc_handler = dirty_background_ratio_handler,
1300 .extra1 = &zero,
1301 .extra2 = &one_hundred,
1302 },
1303 {
1304 .procname = "dirty_background_bytes",
1305 .data = &dirty_background_bytes,
1306 .maxlen = sizeof(dirty_background_bytes),
1307 .mode = 0644,
1308 .proc_handler = dirty_background_bytes_handler,
1309 .extra1 = &one_ul,
1310 },
1311 {
1312 .procname = "dirty_ratio",
1313 .data = &vm_dirty_ratio,
1314 .maxlen = sizeof(vm_dirty_ratio),
1315 .mode = 0644,
1316 .proc_handler = dirty_ratio_handler,
1317 .extra1 = &zero,
1318 .extra2 = &one_hundred,
1319 },
1320 {
1321 .procname = "dirty_bytes",
1322 .data = &vm_dirty_bytes,
1323 .maxlen = sizeof(vm_dirty_bytes),
1324 .mode = 0644,
1325 .proc_handler = dirty_bytes_handler,
1326 .extra1 = &dirty_bytes_min,
1327 },
1328 {
1329 .procname = "dirty_writeback_centisecs",
1330 .data = &dirty_writeback_interval,
1331 .maxlen = sizeof(dirty_writeback_interval),
1332 .mode = 0644,
1333 .proc_handler = dirty_writeback_centisecs_handler,
1334 },
1335 {
1336 .procname = "dirty_expire_centisecs",
1337 .data = &dirty_expire_interval,
1338 .maxlen = sizeof(dirty_expire_interval),
1339 .mode = 0644,
1340 .proc_handler = proc_dointvec_minmax,
1341 .extra1 = &zero,
1342 },
1343 {
1344 .procname = "dirtytime_expire_seconds",
1345 .data = &dirtytime_expire_interval,
1346 .maxlen = sizeof(dirty_expire_interval),
1347 .mode = 0644,
1348 .proc_handler = dirtytime_interval_handler,
1349 .extra1 = &zero,
1350 },
1351 {
1352 .procname = "swappiness",
1353 .data = &vm_swappiness,
1354 .maxlen = sizeof(vm_swappiness),
1355 .mode = 0644,
1356 .proc_handler = proc_dointvec_minmax,
1357 .extra1 = &zero,
1358 .extra2 = &one_hundred,
1359 },
1360 #ifdef CONFIG_HUGETLB_PAGE
1361 {
1362 .procname = "nr_hugepages",
1363 .data = NULL,
1364 .maxlen = sizeof(unsigned long),
1365 .mode = 0644,
1366 .proc_handler = hugetlb_sysctl_handler,
1367 },
1368 #ifdef CONFIG_NUMA
1369 {
1370 .procname = "nr_hugepages_mempolicy",
1371 .data = NULL,
1372 .maxlen = sizeof(unsigned long),
1373 .mode = 0644,
1374 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
1375 },
1376 {
1377 .procname = "numa_stat",
1378 .data = &sysctl_vm_numa_stat,
1379 .maxlen = sizeof(int),
1380 .mode = 0644,
1381 .proc_handler = sysctl_vm_numa_stat_handler,
1382 .extra1 = &zero,
1383 .extra2 = &one,
1384 },
1385 #endif
1386 {
1387 .procname = "hugetlb_shm_group",
1388 .data = &sysctl_hugetlb_shm_group,
1389 .maxlen = sizeof(gid_t),
1390 .mode = 0644,
1391 .proc_handler = proc_dointvec,
1392 },
1393 {
1394 .procname = "hugepages_treat_as_movable",
1395 .data = &hugepages_treat_as_movable,
1396 .maxlen = sizeof(int),
1397 .mode = 0644,
1398 .proc_handler = proc_dointvec,
1399 },
1400 {
1401 .procname = "nr_overcommit_hugepages",
1402 .data = NULL,
1403 .maxlen = sizeof(unsigned long),
1404 .mode = 0644,
1405 .proc_handler = hugetlb_overcommit_handler,
1406 },
1407 #endif
1408 {
1409 .procname = "lowmem_reserve_ratio",
1410 .data = &sysctl_lowmem_reserve_ratio,
1411 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1412 .mode = 0644,
1413 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
1414 },
1415 {
1416 .procname = "drop_caches",
1417 .data = &sysctl_drop_caches,
1418 .maxlen = sizeof(int),
1419 .mode = 0644,
1420 .proc_handler = drop_caches_sysctl_handler,
1421 .extra1 = &one,
1422 .extra2 = &four,
1423 },
1424 #ifdef CONFIG_COMPACTION
1425 {
1426 .procname = "compact_memory",
1427 .data = &sysctl_compact_memory,
1428 .maxlen = sizeof(int),
1429 .mode = 0200,
1430 .proc_handler = sysctl_compaction_handler,
1431 },
1432 {
1433 .procname = "extfrag_threshold",
1434 .data = &sysctl_extfrag_threshold,
1435 .maxlen = sizeof(int),
1436 .mode = 0644,
1437 .proc_handler = sysctl_extfrag_handler,
1438 .extra1 = &min_extfrag_threshold,
1439 .extra2 = &max_extfrag_threshold,
1440 },
1441 {
1442 .procname = "compact_unevictable_allowed",
1443 .data = &sysctl_compact_unevictable_allowed,
1444 .maxlen = sizeof(int),
1445 .mode = 0644,
1446 .proc_handler = proc_dointvec,
1447 .extra1 = &zero,
1448 .extra2 = &one,
1449 },
1450
1451 #endif /* CONFIG_COMPACTION */
1452 {
1453 .procname = "min_free_kbytes",
1454 .data = &min_free_kbytes,
1455 .maxlen = sizeof(min_free_kbytes),
1456 .mode = 0644,
1457 .proc_handler = min_free_kbytes_sysctl_handler,
1458 .extra1 = &zero,
1459 },
1460 {
1461 .procname = "watermark_scale_factor",
1462 .data = &watermark_scale_factor,
1463 .maxlen = sizeof(watermark_scale_factor),
1464 .mode = 0644,
1465 .proc_handler = watermark_scale_factor_sysctl_handler,
1466 .extra1 = &one,
1467 .extra2 = &one_thousand,
1468 },
1469 {
1470 .procname = "percpu_pagelist_fraction",
1471 .data = &percpu_pagelist_fraction,
1472 .maxlen = sizeof(percpu_pagelist_fraction),
1473 .mode = 0644,
1474 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
1475 .extra1 = &zero,
1476 },
1477 #ifdef CONFIG_MMU
1478 {
1479 .procname = "max_map_count",
1480 .data = &sysctl_max_map_count,
1481 .maxlen = sizeof(sysctl_max_map_count),
1482 .mode = 0644,
1483 .proc_handler = proc_dointvec_minmax,
1484 .extra1 = &zero,
1485 },
1486 #else
1487 {
1488 .procname = "nr_trim_pages",
1489 .data = &sysctl_nr_trim_pages,
1490 .maxlen = sizeof(sysctl_nr_trim_pages),
1491 .mode = 0644,
1492 .proc_handler = proc_dointvec_minmax,
1493 .extra1 = &zero,
1494 },
1495 #endif
1496 {
1497 .procname = "laptop_mode",
1498 .data = &laptop_mode,
1499 .maxlen = sizeof(laptop_mode),
1500 .mode = 0644,
1501 .proc_handler = proc_dointvec_jiffies,
1502 },
1503 {
1504 .procname = "block_dump",
1505 .data = &block_dump,
1506 .maxlen = sizeof(block_dump),
1507 .mode = 0644,
1508 .proc_handler = proc_dointvec,
1509 .extra1 = &zero,
1510 },
1511 {
1512 .procname = "vfs_cache_pressure",
1513 .data = &sysctl_vfs_cache_pressure,
1514 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1515 .mode = 0644,
1516 .proc_handler = proc_dointvec,
1517 .extra1 = &zero,
1518 },
1519 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1520 {
1521 .procname = "legacy_va_layout",
1522 .data = &sysctl_legacy_va_layout,
1523 .maxlen = sizeof(sysctl_legacy_va_layout),
1524 .mode = 0644,
1525 .proc_handler = proc_dointvec,
1526 .extra1 = &zero,
1527 },
1528 #endif
1529 #ifdef CONFIG_NUMA
1530 {
1531 .procname = "zone_reclaim_mode",
1532 .data = &node_reclaim_mode,
1533 .maxlen = sizeof(node_reclaim_mode),
1534 .mode = 0644,
1535 .proc_handler = proc_dointvec,
1536 .extra1 = &zero,
1537 },
1538 {
1539 .procname = "min_unmapped_ratio",
1540 .data = &sysctl_min_unmapped_ratio,
1541 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1542 .mode = 0644,
1543 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
1544 .extra1 = &zero,
1545 .extra2 = &one_hundred,
1546 },
1547 {
1548 .procname = "min_slab_ratio",
1549 .data = &sysctl_min_slab_ratio,
1550 .maxlen = sizeof(sysctl_min_slab_ratio),
1551 .mode = 0644,
1552 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
1553 .extra1 = &zero,
1554 .extra2 = &one_hundred,
1555 },
1556 #endif
1557 #ifdef CONFIG_SMP
1558 {
1559 .procname = "stat_interval",
1560 .data = &sysctl_stat_interval,
1561 .maxlen = sizeof(sysctl_stat_interval),
1562 .mode = 0644,
1563 .proc_handler = proc_dointvec_jiffies,
1564 },
1565 {
1566 .procname = "stat_refresh",
1567 .data = NULL,
1568 .maxlen = 0,
1569 .mode = 0600,
1570 .proc_handler = vmstat_refresh,
1571 },
1572 #endif
1573 #ifdef CONFIG_MMU
1574 {
1575 .procname = "mmap_min_addr",
1576 .data = &dac_mmap_min_addr,
1577 .maxlen = sizeof(unsigned long),
1578 .mode = 0644,
1579 .proc_handler = mmap_min_addr_handler,
1580 },
1581 #endif
1582 #ifdef CONFIG_NUMA
1583 {
1584 .procname = "numa_zonelist_order",
1585 .data = &numa_zonelist_order,
1586 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1587 .mode = 0644,
1588 .proc_handler = numa_zonelist_order_handler,
1589 },
1590 #endif
1591 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1592 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1593 {
1594 .procname = "vdso_enabled",
1595 #ifdef CONFIG_X86_32
1596 .data = &vdso32_enabled,
1597 .maxlen = sizeof(vdso32_enabled),
1598 #else
1599 .data = &vdso_enabled,
1600 .maxlen = sizeof(vdso_enabled),
1601 #endif
1602 .mode = 0644,
1603 .proc_handler = proc_dointvec,
1604 .extra1 = &zero,
1605 },
1606 #endif
1607 #ifdef CONFIG_HIGHMEM
1608 {
1609 .procname = "highmem_is_dirtyable",
1610 .data = &vm_highmem_is_dirtyable,
1611 .maxlen = sizeof(vm_highmem_is_dirtyable),
1612 .mode = 0644,
1613 .proc_handler = proc_dointvec_minmax,
1614 .extra1 = &zero,
1615 .extra2 = &one,
1616 },
1617 #endif
1618 #ifdef CONFIG_MEMORY_FAILURE
1619 {
1620 .procname = "memory_failure_early_kill",
1621 .data = &sysctl_memory_failure_early_kill,
1622 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1623 .mode = 0644,
1624 .proc_handler = proc_dointvec_minmax,
1625 .extra1 = &zero,
1626 .extra2 = &one,
1627 },
1628 {
1629 .procname = "memory_failure_recovery",
1630 .data = &sysctl_memory_failure_recovery,
1631 .maxlen = sizeof(sysctl_memory_failure_recovery),
1632 .mode = 0644,
1633 .proc_handler = proc_dointvec_minmax,
1634 .extra1 = &zero,
1635 .extra2 = &one,
1636 },
1637 #endif
1638 {
1639 .procname = "user_reserve_kbytes",
1640 .data = &sysctl_user_reserve_kbytes,
1641 .maxlen = sizeof(sysctl_user_reserve_kbytes),
1642 .mode = 0644,
1643 .proc_handler = proc_doulongvec_minmax,
1644 },
1645 {
1646 .procname = "admin_reserve_kbytes",
1647 .data = &sysctl_admin_reserve_kbytes,
1648 .maxlen = sizeof(sysctl_admin_reserve_kbytes),
1649 .mode = 0644,
1650 .proc_handler = proc_doulongvec_minmax,
1651 },
1652 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS
1653 {
1654 .procname = "mmap_rnd_bits",
1655 .data = &mmap_rnd_bits,
1656 .maxlen = sizeof(mmap_rnd_bits),
1657 .mode = 0600,
1658 .proc_handler = proc_dointvec_minmax,
1659 .extra1 = (void *)&mmap_rnd_bits_min,
1660 .extra2 = (void *)&mmap_rnd_bits_max,
1661 },
1662 #endif
1663 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS
1664 {
1665 .procname = "mmap_rnd_compat_bits",
1666 .data = &mmap_rnd_compat_bits,
1667 .maxlen = sizeof(mmap_rnd_compat_bits),
1668 .mode = 0600,
1669 .proc_handler = proc_dointvec_minmax,
1670 .extra1 = (void *)&mmap_rnd_compat_bits_min,
1671 .extra2 = (void *)&mmap_rnd_compat_bits_max,
1672 },
1673 #endif
1674 { }
1675 };
1676
1677 static struct ctl_table fs_table[] = {
1678 {
1679 .procname = "inode-nr",
1680 .data = &inodes_stat,
1681 .maxlen = 2*sizeof(long),
1682 .mode = 0444,
1683 .proc_handler = proc_nr_inodes,
1684 },
1685 {
1686 .procname = "inode-state",
1687 .data = &inodes_stat,
1688 .maxlen = 7*sizeof(long),
1689 .mode = 0444,
1690 .proc_handler = proc_nr_inodes,
1691 },
1692 {
1693 .procname = "file-nr",
1694 .data = &files_stat,
1695 .maxlen = sizeof(files_stat),
1696 .mode = 0444,
1697 .proc_handler = proc_nr_files,
1698 },
1699 {
1700 .procname = "file-max",
1701 .data = &files_stat.max_files,
1702 .maxlen = sizeof(files_stat.max_files),
1703 .mode = 0644,
1704 .proc_handler = proc_doulongvec_minmax,
1705 .extra1 = &zero_ul,
1706 .extra2 = &long_max,
1707 },
1708 {
1709 .procname = "nr_open",
1710 .data = &sysctl_nr_open,
1711 .maxlen = sizeof(unsigned int),
1712 .mode = 0644,
1713 .proc_handler = proc_dointvec_minmax,
1714 .extra1 = &sysctl_nr_open_min,
1715 .extra2 = &sysctl_nr_open_max,
1716 },
1717 {
1718 .procname = "dentry-state",
1719 .data = &dentry_stat,
1720 .maxlen = 6*sizeof(long),
1721 .mode = 0444,
1722 .proc_handler = proc_nr_dentry,
1723 },
1724 {
1725 .procname = "overflowuid",
1726 .data = &fs_overflowuid,
1727 .maxlen = sizeof(int),
1728 .mode = 0644,
1729 .proc_handler = proc_dointvec_minmax,
1730 .extra1 = &minolduid,
1731 .extra2 = &maxolduid,
1732 },
1733 {
1734 .procname = "overflowgid",
1735 .data = &fs_overflowgid,
1736 .maxlen = sizeof(int),
1737 .mode = 0644,
1738 .proc_handler = proc_dointvec_minmax,
1739 .extra1 = &minolduid,
1740 .extra2 = &maxolduid,
1741 },
1742 #ifdef CONFIG_FILE_LOCKING
1743 {
1744 .procname = "leases-enable",
1745 .data = &leases_enable,
1746 .maxlen = sizeof(int),
1747 .mode = 0644,
1748 .proc_handler = proc_dointvec,
1749 },
1750 #endif
1751 #ifdef CONFIG_DNOTIFY
1752 {
1753 .procname = "dir-notify-enable",
1754 .data = &dir_notify_enable,
1755 .maxlen = sizeof(int),
1756 .mode = 0644,
1757 .proc_handler = proc_dointvec,
1758 },
1759 #endif
1760 #ifdef CONFIG_MMU
1761 #ifdef CONFIG_FILE_LOCKING
1762 {
1763 .procname = "lease-break-time",
1764 .data = &lease_break_time,
1765 .maxlen = sizeof(int),
1766 .mode = 0644,
1767 .proc_handler = proc_dointvec,
1768 },
1769 #endif
1770 #ifdef CONFIG_AIO
1771 {
1772 .procname = "aio-nr",
1773 .data = &aio_nr,
1774 .maxlen = sizeof(aio_nr),
1775 .mode = 0444,
1776 .proc_handler = proc_doulongvec_minmax,
1777 },
1778 {
1779 .procname = "aio-max-nr",
1780 .data = &aio_max_nr,
1781 .maxlen = sizeof(aio_max_nr),
1782 .mode = 0644,
1783 .proc_handler = proc_doulongvec_minmax,
1784 },
1785 #endif /* CONFIG_AIO */
1786 #ifdef CONFIG_INOTIFY_USER
1787 {
1788 .procname = "inotify",
1789 .mode = 0555,
1790 .child = inotify_table,
1791 },
1792 #endif
1793 #ifdef CONFIG_EPOLL
1794 {
1795 .procname = "epoll",
1796 .mode = 0555,
1797 .child = epoll_table,
1798 },
1799 #endif
1800 #endif
1801 {
1802 .procname = "protected_symlinks",
1803 .data = &sysctl_protected_symlinks,
1804 .maxlen = sizeof(int),
1805 .mode = 0600,
1806 .proc_handler = proc_dointvec_minmax,
1807 .extra1 = &zero,
1808 .extra2 = &one,
1809 },
1810 {
1811 .procname = "protected_hardlinks",
1812 .data = &sysctl_protected_hardlinks,
1813 .maxlen = sizeof(int),
1814 .mode = 0600,
1815 .proc_handler = proc_dointvec_minmax,
1816 .extra1 = &zero,
1817 .extra2 = &one,
1818 },
1819 {
1820 .procname = "suid_dumpable",
1821 .data = &suid_dumpable,
1822 .maxlen = sizeof(int),
1823 .mode = 0644,
1824 .proc_handler = proc_dointvec_minmax_coredump,
1825 .extra1 = &zero,
1826 .extra2 = &two,
1827 },
1828 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1829 {
1830 .procname = "binfmt_misc",
1831 .mode = 0555,
1832 .child = sysctl_mount_point,
1833 },
1834 #endif
1835 {
1836 .procname = "pipe-max-size",
1837 .data = &pipe_max_size,
1838 .maxlen = sizeof(pipe_max_size),
1839 .mode = 0644,
1840 .proc_handler = &pipe_proc_fn,
1841 .extra1 = &pipe_min_size,
1842 },
1843 {
1844 .procname = "pipe-user-pages-hard",
1845 .data = &pipe_user_pages_hard,
1846 .maxlen = sizeof(pipe_user_pages_hard),
1847 .mode = 0644,
1848 .proc_handler = proc_doulongvec_minmax,
1849 },
1850 {
1851 .procname = "pipe-user-pages-soft",
1852 .data = &pipe_user_pages_soft,
1853 .maxlen = sizeof(pipe_user_pages_soft),
1854 .mode = 0644,
1855 .proc_handler = proc_doulongvec_minmax,
1856 },
1857 {
1858 .procname = "mount-max",
1859 .data = &sysctl_mount_max,
1860 .maxlen = sizeof(unsigned int),
1861 .mode = 0644,
1862 .proc_handler = proc_dointvec_minmax,
1863 .extra1 = &one,
1864 },
1865 { }
1866 };
1867
1868 static struct ctl_table debug_table[] = {
1869 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1870 {
1871 .procname = "exception-trace",
1872 .data = &show_unhandled_signals,
1873 .maxlen = sizeof(int),
1874 .mode = 0644,
1875 .proc_handler = proc_dointvec
1876 },
1877 #endif
1878 #if defined(CONFIG_OPTPROBES)
1879 {
1880 .procname = "kprobes-optimization",
1881 .data = &sysctl_kprobes_optimization,
1882 .maxlen = sizeof(int),
1883 .mode = 0644,
1884 .proc_handler = proc_kprobes_optimization_handler,
1885 .extra1 = &zero,
1886 .extra2 = &one,
1887 },
1888 #endif
1889 { }
1890 };
1891
1892 static struct ctl_table dev_table[] = {
1893 { }
1894 };
1895
1896 int __init sysctl_init(void)
1897 {
1898 struct ctl_table_header *hdr;
1899
1900 hdr = register_sysctl_table(sysctl_base_table);
1901 kmemleak_not_leak(hdr);
1902 return 0;
1903 }
1904
1905 #endif /* CONFIG_SYSCTL */
1906
1907 /*
1908 * /proc/sys support
1909 */
1910
1911 #ifdef CONFIG_PROC_SYSCTL
1912
1913 static int _proc_do_string(char *data, int maxlen, int write,
1914 char __user *buffer,
1915 size_t *lenp, loff_t *ppos)
1916 {
1917 size_t len;
1918 char __user *p;
1919 char c;
1920
1921 if (!data || !maxlen || !*lenp) {
1922 *lenp = 0;
1923 return 0;
1924 }
1925
1926 if (write) {
1927 if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) {
1928 /* Only continue writes not past the end of buffer. */
1929 len = strlen(data);
1930 if (len > maxlen - 1)
1931 len = maxlen - 1;
1932
1933 if (*ppos > len)
1934 return 0;
1935 len = *ppos;
1936 } else {
1937 /* Start writing from beginning of buffer. */
1938 len = 0;
1939 }
1940
1941 *ppos += *lenp;
1942 p = buffer;
1943 while ((p - buffer) < *lenp && len < maxlen - 1) {
1944 if (get_user(c, p++))
1945 return -EFAULT;
1946 if (c == 0 || c == '\n')
1947 break;
1948 data[len++] = c;
1949 }
1950 data[len] = 0;
1951 } else {
1952 len = strlen(data);
1953 if (len > maxlen)
1954 len = maxlen;
1955
1956 if (*ppos > len) {
1957 *lenp = 0;
1958 return 0;
1959 }
1960
1961 data += *ppos;
1962 len -= *ppos;
1963
1964 if (len > *lenp)
1965 len = *lenp;
1966 if (len)
1967 if (copy_to_user(buffer, data, len))
1968 return -EFAULT;
1969 if (len < *lenp) {
1970 if (put_user('\n', buffer + len))
1971 return -EFAULT;
1972 len++;
1973 }
1974 *lenp = len;
1975 *ppos += len;
1976 }
1977 return 0;
1978 }
1979
1980 static void warn_sysctl_write(struct ctl_table *table)
1981 {
1982 pr_warn_once("%s wrote to %s when file position was not 0!\n"
1983 "This will not be supported in the future. To silence this\n"
1984 "warning, set kernel.sysctl_writes_strict = -1\n",
1985 current->comm, table->procname);
1986 }
1987
1988 /**
1989 * proc_first_pos_non_zero_ignore - check if firs position is allowed
1990 * @ppos: file position
1991 * @table: the sysctl table
1992 *
1993 * Returns true if the first position is non-zero and the sysctl_writes_strict
1994 * mode indicates this is not allowed for numeric input types. String proc
1995 * hadlers can ignore the return value.
1996 */
1997 static bool proc_first_pos_non_zero_ignore(loff_t *ppos,
1998 struct ctl_table *table)
1999 {
2000 if (!*ppos)
2001 return false;
2002
2003 switch (sysctl_writes_strict) {
2004 case SYSCTL_WRITES_STRICT:
2005 return true;
2006 case SYSCTL_WRITES_WARN:
2007 warn_sysctl_write(table);
2008 return false;
2009 default:
2010 return false;
2011 }
2012 }
2013
2014 /**
2015 * proc_dostring - read a string sysctl
2016 * @table: the sysctl table
2017 * @write: %TRUE if this is a write to the sysctl file
2018 * @buffer: the user buffer
2019 * @lenp: the size of the user buffer
2020 * @ppos: file position
2021 *
2022 * Reads/writes a string from/to the user buffer. If the kernel
2023 * buffer provided is not large enough to hold the string, the
2024 * string is truncated. The copied string is %NULL-terminated.
2025 * If the string is being read by the user process, it is copied
2026 * and a newline '\n' is added. It is truncated if the buffer is
2027 * not large enough.
2028 *
2029 * Returns 0 on success.
2030 */
2031 int proc_dostring(struct ctl_table *table, int write,
2032 void __user *buffer, size_t *lenp, loff_t *ppos)
2033 {
2034 if (write)
2035 proc_first_pos_non_zero_ignore(ppos, table);
2036
2037 return _proc_do_string((char *)(table->data), table->maxlen, write,
2038 (char __user *)buffer, lenp, ppos);
2039 }
2040
2041 static size_t proc_skip_spaces(char **buf)
2042 {
2043 size_t ret;
2044 char *tmp = skip_spaces(*buf);
2045 ret = tmp - *buf;
2046 *buf = tmp;
2047 return ret;
2048 }
2049
2050 static void proc_skip_char(char **buf, size_t *size, const char v)
2051 {
2052 while (*size) {
2053 if (**buf != v)
2054 break;
2055 (*size)--;
2056 (*buf)++;
2057 }
2058 }
2059
2060 /**
2061 * strtoul_lenient - parse an ASCII formatted integer from a buffer and only
2062 * fail on overflow
2063 *
2064 * @cp: kernel buffer containing the string to parse
2065 * @endp: pointer to store the trailing characters
2066 * @base: the base to use
2067 * @res: where the parsed integer will be stored
2068 *
2069 * In case of success 0 is returned and @res will contain the parsed integer,
2070 * @endp will hold any trailing characters.
2071 * This function will fail the parse on overflow. If there wasn't an overflow
2072 * the function will defer the decision what characters count as invalid to the
2073 * caller.
2074 */
2075 static int strtoul_lenient(const char *cp, char **endp, unsigned int base,
2076 unsigned long *res)
2077 {
2078 unsigned long long result;
2079 unsigned int rv;
2080
2081 cp = _parse_integer_fixup_radix(cp, &base);
2082 rv = _parse_integer(cp, base, &result);
2083 if ((rv & KSTRTOX_OVERFLOW) || (result != (unsigned long)result))
2084 return -ERANGE;
2085
2086 cp += rv;
2087
2088 if (endp)
2089 *endp = (char *)cp;
2090
2091 *res = (unsigned long)result;
2092 return 0;
2093 }
2094
2095 #define TMPBUFLEN 22
2096 /**
2097 * proc_get_long - reads an ASCII formatted integer from a user buffer
2098 *
2099 * @buf: a kernel buffer
2100 * @size: size of the kernel buffer
2101 * @val: this is where the number will be stored
2102 * @neg: set to %TRUE if number is negative
2103 * @perm_tr: a vector which contains the allowed trailers
2104 * @perm_tr_len: size of the perm_tr vector
2105 * @tr: pointer to store the trailer character
2106 *
2107 * In case of success %0 is returned and @buf and @size are updated with
2108 * the amount of bytes read. If @tr is non-NULL and a trailing
2109 * character exists (size is non-zero after returning from this
2110 * function), @tr is updated with the trailing character.
2111 */
2112 static int proc_get_long(char **buf, size_t *size,
2113 unsigned long *val, bool *neg,
2114 const char *perm_tr, unsigned perm_tr_len, char *tr)
2115 {
2116 int len;
2117 char *p, tmp[TMPBUFLEN];
2118
2119 if (!*size)
2120 return -EINVAL;
2121
2122 len = *size;
2123 if (len > TMPBUFLEN - 1)
2124 len = TMPBUFLEN - 1;
2125
2126 memcpy(tmp, *buf, len);
2127
2128 tmp[len] = 0;
2129 p = tmp;
2130 if (*p == '-' && *size > 1) {
2131 *neg = true;
2132 p++;
2133 } else
2134 *neg = false;
2135 if (!isdigit(*p))
2136 return -EINVAL;
2137
2138 if (strtoul_lenient(p, &p, 0, val))
2139 return -EINVAL;
2140
2141 len = p - tmp;
2142
2143 /* We don't know if the next char is whitespace thus we may accept
2144 * invalid integers (e.g. 1234...a) or two integers instead of one
2145 * (e.g. 123...1). So lets not allow such large numbers. */
2146 if (len == TMPBUFLEN - 1)
2147 return -EINVAL;
2148
2149 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
2150 return -EINVAL;
2151
2152 if (tr && (len < *size))
2153 *tr = *p;
2154
2155 *buf += len;
2156 *size -= len;
2157
2158 return 0;
2159 }
2160
2161 /**
2162 * proc_put_long - converts an integer to a decimal ASCII formatted string
2163 *
2164 * @buf: the user buffer
2165 * @size: the size of the user buffer
2166 * @val: the integer to be converted
2167 * @neg: sign of the number, %TRUE for negative
2168 *
2169 * In case of success %0 is returned and @buf and @size are updated with
2170 * the amount of bytes written.
2171 */
2172 static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
2173 bool neg)
2174 {
2175 int len;
2176 char tmp[TMPBUFLEN], *p = tmp;
2177
2178 sprintf(p, "%s%lu", neg ? "-" : "", val);
2179 len = strlen(tmp);
2180 if (len > *size)
2181 len = *size;
2182 if (copy_to_user(*buf, tmp, len))
2183 return -EFAULT;
2184 *size -= len;
2185 *buf += len;
2186 return 0;
2187 }
2188 #undef TMPBUFLEN
2189
2190 static int proc_put_char(void __user **buf, size_t *size, char c)
2191 {
2192 if (*size) {
2193 char __user **buffer = (char __user **)buf;
2194 if (put_user(c, *buffer))
2195 return -EFAULT;
2196 (*size)--, (*buffer)++;
2197 *buf = *buffer;
2198 }
2199 return 0;
2200 }
2201
2202 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
2203 int *valp,
2204 int write, void *data)
2205 {
2206 if (write) {
2207 if (*negp) {
2208 if (*lvalp > (unsigned long) INT_MAX + 1)
2209 return -EINVAL;
2210 *valp = -*lvalp;
2211 } else {
2212 if (*lvalp > (unsigned long) INT_MAX)
2213 return -EINVAL;
2214 *valp = *lvalp;
2215 }
2216 } else {
2217 int val = *valp;
2218 if (val < 0) {
2219 *negp = true;
2220 *lvalp = -(unsigned long)val;
2221 } else {
2222 *negp = false;
2223 *lvalp = (unsigned long)val;
2224 }
2225 }
2226 return 0;
2227 }
2228
2229 static int do_proc_douintvec_conv(unsigned long *lvalp,
2230 unsigned int *valp,
2231 int write, void *data)
2232 {
2233 if (write) {
2234 if (*lvalp > UINT_MAX)
2235 return -EINVAL;
2236 *valp = *lvalp;
2237 } else {
2238 unsigned int val = *valp;
2239 *lvalp = (unsigned long)val;
2240 }
2241 return 0;
2242 }
2243
2244 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
2245
2246 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
2247 int write, void __user *buffer,
2248 size_t *lenp, loff_t *ppos,
2249 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2250 int write, void *data),
2251 void *data)
2252 {
2253 int *i, vleft, first = 1, err = 0;
2254 size_t left;
2255 char *kbuf = NULL, *p;
2256
2257 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
2258 *lenp = 0;
2259 return 0;
2260 }
2261
2262 i = (int *) tbl_data;
2263 vleft = table->maxlen / sizeof(*i);
2264 left = *lenp;
2265
2266 if (!conv)
2267 conv = do_proc_dointvec_conv;
2268
2269 if (write) {
2270 if (proc_first_pos_non_zero_ignore(ppos, table))
2271 goto out;
2272
2273 if (left > PAGE_SIZE - 1)
2274 left = PAGE_SIZE - 1;
2275 p = kbuf = memdup_user_nul(buffer, left);
2276 if (IS_ERR(kbuf))
2277 return PTR_ERR(kbuf);
2278 }
2279
2280 for (; left && vleft--; i++, first=0) {
2281 unsigned long lval;
2282 bool neg;
2283
2284 if (write) {
2285 left -= proc_skip_spaces(&p);
2286
2287 if (!left)
2288 break;
2289 err = proc_get_long(&p, &left, &lval, &neg,
2290 proc_wspace_sep,
2291 sizeof(proc_wspace_sep), NULL);
2292 if (err)
2293 break;
2294 if (conv(&neg, &lval, i, 1, data)) {
2295 err = -EINVAL;
2296 break;
2297 }
2298 } else {
2299 if (conv(&neg, &lval, i, 0, data)) {
2300 err = -EINVAL;
2301 break;
2302 }
2303 if (!first)
2304 err = proc_put_char(&buffer, &left, '\t');
2305 if (err)
2306 break;
2307 err = proc_put_long(&buffer, &left, lval, neg);
2308 if (err)
2309 break;
2310 }
2311 }
2312
2313 if (!write && !first && left && !err)
2314 err = proc_put_char(&buffer, &left, '\n');
2315 if (write && !err && left)
2316 left -= proc_skip_spaces(&p);
2317 if (write) {
2318 kfree(kbuf);
2319 if (first)
2320 return err ? : -EINVAL;
2321 }
2322 *lenp -= left;
2323 out:
2324 *ppos += *lenp;
2325 return err;
2326 }
2327
2328 static int do_proc_dointvec(struct ctl_table *table, int write,
2329 void __user *buffer, size_t *lenp, loff_t *ppos,
2330 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2331 int write, void *data),
2332 void *data)
2333 {
2334 return __do_proc_dointvec(table->data, table, write,
2335 buffer, lenp, ppos, conv, data);
2336 }
2337
2338 static int do_proc_douintvec_w(unsigned int *tbl_data,
2339 struct ctl_table *table,
2340 void __user *buffer,
2341 size_t *lenp, loff_t *ppos,
2342 int (*conv)(unsigned long *lvalp,
2343 unsigned int *valp,
2344 int write, void *data),
2345 void *data)
2346 {
2347 unsigned long lval;
2348 int err = 0;
2349 size_t left;
2350 bool neg;
2351 char *kbuf = NULL, *p;
2352
2353 left = *lenp;
2354
2355 if (proc_first_pos_non_zero_ignore(ppos, table))
2356 goto bail_early;
2357
2358 if (left > PAGE_SIZE - 1)
2359 left = PAGE_SIZE - 1;
2360
2361 p = kbuf = memdup_user_nul(buffer, left);
2362 if (IS_ERR(kbuf))
2363 return -EINVAL;
2364
2365 left -= proc_skip_spaces(&p);
2366 if (!left) {
2367 err = -EINVAL;
2368 goto out_free;
2369 }
2370
2371 err = proc_get_long(&p, &left, &lval, &neg,
2372 proc_wspace_sep,
2373 sizeof(proc_wspace_sep), NULL);
2374 if (err || neg) {
2375 err = -EINVAL;
2376 goto out_free;
2377 }
2378
2379 if (conv(&lval, tbl_data, 1, data)) {
2380 err = -EINVAL;
2381 goto out_free;
2382 }
2383
2384 if (!err && left)
2385 left -= proc_skip_spaces(&p);
2386
2387 out_free:
2388 kfree(kbuf);
2389 if (err)
2390 return -EINVAL;
2391
2392 return 0;
2393
2394 /* This is in keeping with old __do_proc_dointvec() */
2395 bail_early:
2396 *ppos += *lenp;
2397 return err;
2398 }
2399
2400 static int do_proc_douintvec_r(unsigned int *tbl_data, void __user *buffer,
2401 size_t *lenp, loff_t *ppos,
2402 int (*conv)(unsigned long *lvalp,
2403 unsigned int *valp,
2404 int write, void *data),
2405 void *data)
2406 {
2407 unsigned long lval;
2408 int err = 0;
2409 size_t left;
2410
2411 left = *lenp;
2412
2413 if (conv(&lval, tbl_data, 0, data)) {
2414 err = -EINVAL;
2415 goto out;
2416 }
2417
2418 err = proc_put_long(&buffer, &left, lval, false);
2419 if (err || !left)
2420 goto out;
2421
2422 err = proc_put_char(&buffer, &left, '\n');
2423
2424 out:
2425 *lenp -= left;
2426 *ppos += *lenp;
2427
2428 return err;
2429 }
2430
2431 static int __do_proc_douintvec(void *tbl_data, struct ctl_table *table,
2432 int write, void __user *buffer,
2433 size_t *lenp, loff_t *ppos,
2434 int (*conv)(unsigned long *lvalp,
2435 unsigned int *valp,
2436 int write, void *data),
2437 void *data)
2438 {
2439 unsigned int *i, vleft;
2440
2441 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
2442 *lenp = 0;
2443 return 0;
2444 }
2445
2446 i = (unsigned int *) tbl_data;
2447 vleft = table->maxlen / sizeof(*i);
2448
2449 /*
2450 * Arrays are not supported, keep this simple. *Do not* add
2451 * support for them.
2452 */
2453 if (vleft != 1) {
2454 *lenp = 0;
2455 return -EINVAL;
2456 }
2457
2458 if (!conv)
2459 conv = do_proc_douintvec_conv;
2460
2461 if (write)
2462 return do_proc_douintvec_w(i, table, buffer, lenp, ppos,
2463 conv, data);
2464 return do_proc_douintvec_r(i, buffer, lenp, ppos, conv, data);
2465 }
2466
2467 static int do_proc_douintvec(struct ctl_table *table, int write,
2468 void __user *buffer, size_t *lenp, loff_t *ppos,
2469 int (*conv)(unsigned long *lvalp,
2470 unsigned int *valp,
2471 int write, void *data),
2472 void *data)
2473 {
2474 return __do_proc_douintvec(table->data, table, write,
2475 buffer, lenp, ppos, conv, data);
2476 }
2477
2478 /**
2479 * proc_dointvec - read a vector of integers
2480 * @table: the sysctl table
2481 * @write: %TRUE if this is a write to the sysctl file
2482 * @buffer: the user buffer
2483 * @lenp: the size of the user buffer
2484 * @ppos: file position
2485 *
2486 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2487 * values from/to the user buffer, treated as an ASCII string.
2488 *
2489 * Returns 0 on success.
2490 */
2491 int proc_dointvec(struct ctl_table *table, int write,
2492 void __user *buffer, size_t *lenp, loff_t *ppos)
2493 {
2494 return do_proc_dointvec(table, write, buffer, lenp, ppos, NULL, NULL);
2495 }
2496
2497 /**
2498 * proc_douintvec - read a vector of unsigned integers
2499 * @table: the sysctl table
2500 * @write: %TRUE if this is a write to the sysctl file
2501 * @buffer: the user buffer
2502 * @lenp: the size of the user buffer
2503 * @ppos: file position
2504 *
2505 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
2506 * values from/to the user buffer, treated as an ASCII string.
2507 *
2508 * Returns 0 on success.
2509 */
2510 int proc_douintvec(struct ctl_table *table, int write,
2511 void __user *buffer, size_t *lenp, loff_t *ppos)
2512 {
2513 return do_proc_douintvec(table, write, buffer, lenp, ppos,
2514 do_proc_douintvec_conv, NULL);
2515 }
2516
2517 /*
2518 * Taint values can only be increased
2519 * This means we can safely use a temporary.
2520 */
2521 static int proc_taint(struct ctl_table *table, int write,
2522 void __user *buffer, size_t *lenp, loff_t *ppos)
2523 {
2524 struct ctl_table t;
2525 unsigned long tmptaint = get_taint();
2526 int err;
2527
2528 if (write && !capable(CAP_SYS_ADMIN))
2529 return -EPERM;
2530
2531 t = *table;
2532 t.data = &tmptaint;
2533 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2534 if (err < 0)
2535 return err;
2536
2537 if (write) {
2538 /*
2539 * Poor man's atomic or. Not worth adding a primitive
2540 * to everyone's atomic.h for this
2541 */
2542 int i;
2543 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2544 if ((tmptaint >> i) & 1)
2545 add_taint(i, LOCKDEP_STILL_OK);
2546 }
2547 }
2548
2549 return err;
2550 }
2551
2552 #ifdef CONFIG_PRINTK
2553 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
2554 void __user *buffer, size_t *lenp, loff_t *ppos)
2555 {
2556 if (write && !capable(CAP_SYS_ADMIN))
2557 return -EPERM;
2558
2559 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2560 }
2561 #endif
2562
2563 struct do_proc_dointvec_minmax_conv_param {
2564 int *min;
2565 int *max;
2566 };
2567
2568 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2569 int *valp,
2570 int write, void *data)
2571 {
2572 struct do_proc_dointvec_minmax_conv_param *param = data;
2573 if (write) {
2574 int val = *negp ? -*lvalp : *lvalp;
2575 if ((param->min && *param->min > val) ||
2576 (param->max && *param->max < val))
2577 return -EINVAL;
2578 *valp = val;
2579 } else {
2580 int val = *valp;
2581 if (val < 0) {
2582 *negp = true;
2583 *lvalp = -(unsigned long)val;
2584 } else {
2585 *negp = false;
2586 *lvalp = (unsigned long)val;
2587 }
2588 }
2589 return 0;
2590 }
2591
2592 /**
2593 * proc_dointvec_minmax - read a vector of integers with min/max values
2594 * @table: the sysctl table
2595 * @write: %TRUE if this is a write to the sysctl file
2596 * @buffer: the user buffer
2597 * @lenp: the size of the user buffer
2598 * @ppos: file position
2599 *
2600 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2601 * values from/to the user buffer, treated as an ASCII string.
2602 *
2603 * This routine will ensure the values are within the range specified by
2604 * table->extra1 (min) and table->extra2 (max).
2605 *
2606 * Returns 0 on success.
2607 */
2608 int proc_dointvec_minmax(struct ctl_table *table, int write,
2609 void __user *buffer, size_t *lenp, loff_t *ppos)
2610 {
2611 struct do_proc_dointvec_minmax_conv_param param = {
2612 .min = (int *) table->extra1,
2613 .max = (int *) table->extra2,
2614 };
2615 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2616 do_proc_dointvec_minmax_conv, &param);
2617 }
2618
2619 struct do_proc_douintvec_minmax_conv_param {
2620 unsigned int *min;
2621 unsigned int *max;
2622 };
2623
2624 static int do_proc_douintvec_minmax_conv(unsigned long *lvalp,
2625 unsigned int *valp,
2626 int write, void *data)
2627 {
2628 struct do_proc_douintvec_minmax_conv_param *param = data;
2629
2630 if (write) {
2631 unsigned int val = *lvalp;
2632
2633 if (*lvalp > UINT_MAX)
2634 return -EINVAL;
2635
2636 if ((param->min && *param->min > val) ||
2637 (param->max && *param->max < val))
2638 return -ERANGE;
2639
2640 *valp = val;
2641 } else {
2642 unsigned int val = *valp;
2643 *lvalp = (unsigned long) val;
2644 }
2645
2646 return 0;
2647 }
2648
2649 /**
2650 * proc_douintvec_minmax - read a vector of unsigned ints with min/max values
2651 * @table: the sysctl table
2652 * @write: %TRUE if this is a write to the sysctl file
2653 * @buffer: the user buffer
2654 * @lenp: the size of the user buffer
2655 * @ppos: file position
2656 *
2657 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
2658 * values from/to the user buffer, treated as an ASCII string. Negative
2659 * strings are not allowed.
2660 *
2661 * This routine will ensure the values are within the range specified by
2662 * table->extra1 (min) and table->extra2 (max). There is a final sanity
2663 * check for UINT_MAX to avoid having to support wrap around uses from
2664 * userspace.
2665 *
2666 * Returns 0 on success.
2667 */
2668 int proc_douintvec_minmax(struct ctl_table *table, int write,
2669 void __user *buffer, size_t *lenp, loff_t *ppos)
2670 {
2671 struct do_proc_douintvec_minmax_conv_param param = {
2672 .min = (unsigned int *) table->extra1,
2673 .max = (unsigned int *) table->extra2,
2674 };
2675 return do_proc_douintvec(table, write, buffer, lenp, ppos,
2676 do_proc_douintvec_minmax_conv, &param);
2677 }
2678
2679 struct do_proc_dopipe_max_size_conv_param {
2680 unsigned int *min;
2681 };
2682
2683 static int do_proc_dopipe_max_size_conv(unsigned long *lvalp,
2684 unsigned int *valp,
2685 int write, void *data)
2686 {
2687 struct do_proc_dopipe_max_size_conv_param *param = data;
2688
2689 if (write) {
2690 unsigned int val;
2691
2692 if (*lvalp > UINT_MAX)
2693 return -EINVAL;
2694
2695 val = round_pipe_size(*lvalp);
2696 if (val == 0)
2697 return -EINVAL;
2698
2699 if (param->min && *param->min > val)
2700 return -ERANGE;
2701
2702 *valp = val;
2703 } else {
2704 unsigned int val = *valp;
2705 *lvalp = (unsigned long) val;
2706 }
2707
2708 return 0;
2709 }
2710
2711 int proc_dopipe_max_size(struct ctl_table *table, int write,
2712 void __user *buffer, size_t *lenp, loff_t *ppos)
2713 {
2714 struct do_proc_dopipe_max_size_conv_param param = {
2715 .min = (unsigned int *) table->extra1,
2716 };
2717 return do_proc_douintvec(table, write, buffer, lenp, ppos,
2718 do_proc_dopipe_max_size_conv, &param);
2719 }
2720
2721 static void validate_coredump_safety(void)
2722 {
2723 #ifdef CONFIG_COREDUMP
2724 if (suid_dumpable == SUID_DUMP_ROOT &&
2725 core_pattern[0] != '/' && core_pattern[0] != '|') {
2726 printk(KERN_WARNING
2727 "Unsafe core_pattern used with fs.suid_dumpable=2.\n"
2728 "Pipe handler or fully qualified core dump path required.\n"
2729 "Set kernel.core_pattern before fs.suid_dumpable.\n"
2730 );
2731 }
2732 #endif
2733 }
2734
2735 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2736 void __user *buffer, size_t *lenp, loff_t *ppos)
2737 {
2738 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2739 if (!error)
2740 validate_coredump_safety();
2741 return error;
2742 }
2743
2744 #ifdef CONFIG_COREDUMP
2745 static int proc_dostring_coredump(struct ctl_table *table, int write,
2746 void __user *buffer, size_t *lenp, loff_t *ppos)
2747 {
2748 int error = proc_dostring(table, write, buffer, lenp, ppos);
2749 if (!error)
2750 validate_coredump_safety();
2751 return error;
2752 }
2753 #endif
2754
2755 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2756 void __user *buffer,
2757 size_t *lenp, loff_t *ppos,
2758 unsigned long convmul,
2759 unsigned long convdiv)
2760 {
2761 unsigned long *i, *min, *max;
2762 int vleft, first = 1, err = 0;
2763 size_t left;
2764 char *kbuf = NULL, *p;
2765
2766 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2767 *lenp = 0;
2768 return 0;
2769 }
2770
2771 i = (unsigned long *) data;
2772 min = (unsigned long *) table->extra1;
2773 max = (unsigned long *) table->extra2;
2774 vleft = table->maxlen / sizeof(unsigned long);
2775 left = *lenp;
2776
2777 if (write) {
2778 if (proc_first_pos_non_zero_ignore(ppos, table))
2779 goto out;
2780
2781 if (left > PAGE_SIZE - 1)
2782 left = PAGE_SIZE - 1;
2783 p = kbuf = memdup_user_nul(buffer, left);
2784 if (IS_ERR(kbuf))
2785 return PTR_ERR(kbuf);
2786 }
2787
2788 for (; left && vleft--; i++, first = 0) {
2789 unsigned long val;
2790
2791 if (write) {
2792 bool neg;
2793
2794 left -= proc_skip_spaces(&p);
2795
2796 err = proc_get_long(&p, &left, &val, &neg,
2797 proc_wspace_sep,
2798 sizeof(proc_wspace_sep), NULL);
2799 if (err)
2800 break;
2801 if (neg)
2802 continue;
2803 val = convmul * val / convdiv;
2804 if ((min && val < *min) || (max && val > *max))
2805 continue;
2806 *i = val;
2807 } else {
2808 val = convdiv * (*i) / convmul;
2809 if (!first) {
2810 err = proc_put_char(&buffer, &left, '\t');
2811 if (err)
2812 break;
2813 }
2814 err = proc_put_long(&buffer, &left, val, false);
2815 if (err)
2816 break;
2817 }
2818 }
2819
2820 if (!write && !first && left && !err)
2821 err = proc_put_char(&buffer, &left, '\n');
2822 if (write && !err)
2823 left -= proc_skip_spaces(&p);
2824 if (write) {
2825 kfree(kbuf);
2826 if (first)
2827 return err ? : -EINVAL;
2828 }
2829 *lenp -= left;
2830 out:
2831 *ppos += *lenp;
2832 return err;
2833 }
2834
2835 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2836 void __user *buffer,
2837 size_t *lenp, loff_t *ppos,
2838 unsigned long convmul,
2839 unsigned long convdiv)
2840 {
2841 return __do_proc_doulongvec_minmax(table->data, table, write,
2842 buffer, lenp, ppos, convmul, convdiv);
2843 }
2844
2845 /**
2846 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2847 * @table: the sysctl table
2848 * @write: %TRUE if this is a write to the sysctl file
2849 * @buffer: the user buffer
2850 * @lenp: the size of the user buffer
2851 * @ppos: file position
2852 *
2853 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2854 * values from/to the user buffer, treated as an ASCII string.
2855 *
2856 * This routine will ensure the values are within the range specified by
2857 * table->extra1 (min) and table->extra2 (max).
2858 *
2859 * Returns 0 on success.
2860 */
2861 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2862 void __user *buffer, size_t *lenp, loff_t *ppos)
2863 {
2864 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2865 }
2866
2867 /**
2868 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2869 * @table: the sysctl table
2870 * @write: %TRUE if this is a write to the sysctl file
2871 * @buffer: the user buffer
2872 * @lenp: the size of the user buffer
2873 * @ppos: file position
2874 *
2875 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2876 * values from/to the user buffer, treated as an ASCII string. The values
2877 * are treated as milliseconds, and converted to jiffies when they are stored.
2878 *
2879 * This routine will ensure the values are within the range specified by
2880 * table->extra1 (min) and table->extra2 (max).
2881 *
2882 * Returns 0 on success.
2883 */
2884 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2885 void __user *buffer,
2886 size_t *lenp, loff_t *ppos)
2887 {
2888 return do_proc_doulongvec_minmax(table, write, buffer,
2889 lenp, ppos, HZ, 1000l);
2890 }
2891
2892
2893 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2894 int *valp,
2895 int write, void *data)
2896 {
2897 if (write) {
2898 if (*lvalp > INT_MAX / HZ)
2899 return 1;
2900 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
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 = lval / HZ;
2912 }
2913 return 0;
2914 }
2915
2916 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2917 int *valp,
2918 int write, void *data)
2919 {
2920 if (write) {
2921 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2922 return 1;
2923 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2924 } else {
2925 int val = *valp;
2926 unsigned long lval;
2927 if (val < 0) {
2928 *negp = true;
2929 lval = -(unsigned long)val;
2930 } else {
2931 *negp = false;
2932 lval = (unsigned long)val;
2933 }
2934 *lvalp = jiffies_to_clock_t(lval);
2935 }
2936 return 0;
2937 }
2938
2939 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2940 int *valp,
2941 int write, void *data)
2942 {
2943 if (write) {
2944 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2945
2946 if (jif > INT_MAX)
2947 return 1;
2948 *valp = (int)jif;
2949 } else {
2950 int val = *valp;
2951 unsigned long lval;
2952 if (val < 0) {
2953 *negp = true;
2954 lval = -(unsigned long)val;
2955 } else {
2956 *negp = false;
2957 lval = (unsigned long)val;
2958 }
2959 *lvalp = jiffies_to_msecs(lval);
2960 }
2961 return 0;
2962 }
2963
2964 /**
2965 * proc_dointvec_jiffies - read a vector of integers as seconds
2966 * @table: the sysctl table
2967 * @write: %TRUE if this is a write to the sysctl file
2968 * @buffer: the user buffer
2969 * @lenp: the size of the user buffer
2970 * @ppos: file position
2971 *
2972 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2973 * values from/to the user buffer, treated as an ASCII string.
2974 * The values read are assumed to be in seconds, and are converted into
2975 * jiffies.
2976 *
2977 * Returns 0 on success.
2978 */
2979 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2980 void __user *buffer, size_t *lenp, loff_t *ppos)
2981 {
2982 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2983 do_proc_dointvec_jiffies_conv,NULL);
2984 }
2985
2986 /**
2987 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2988 * @table: the sysctl table
2989 * @write: %TRUE if this is a write to the sysctl file
2990 * @buffer: the user buffer
2991 * @lenp: the size of the user buffer
2992 * @ppos: pointer to the file position
2993 *
2994 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2995 * values from/to the user buffer, treated as an ASCII string.
2996 * The values read are assumed to be in 1/USER_HZ seconds, and
2997 * are converted into jiffies.
2998 *
2999 * Returns 0 on success.
3000 */
3001 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
3002 void __user *buffer, size_t *lenp, loff_t *ppos)
3003 {
3004 return do_proc_dointvec(table,write,buffer,lenp,ppos,
3005 do_proc_dointvec_userhz_jiffies_conv,NULL);
3006 }
3007
3008 /**
3009 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
3010 * @table: the sysctl table
3011 * @write: %TRUE if this is a write to the sysctl file
3012 * @buffer: the user buffer
3013 * @lenp: the size of the user buffer
3014 * @ppos: file position
3015 * @ppos: the current position in the file
3016 *
3017 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
3018 * values from/to the user buffer, treated as an ASCII string.
3019 * The values read are assumed to be in 1/1000 seconds, and
3020 * are converted into jiffies.
3021 *
3022 * Returns 0 on success.
3023 */
3024 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
3025 void __user *buffer, size_t *lenp, loff_t *ppos)
3026 {
3027 return do_proc_dointvec(table, write, buffer, lenp, ppos,
3028 do_proc_dointvec_ms_jiffies_conv, NULL);
3029 }
3030
3031 static int proc_do_cad_pid(struct ctl_table *table, int write,
3032 void __user *buffer, size_t *lenp, loff_t *ppos)
3033 {
3034 struct pid *new_pid;
3035 pid_t tmp;
3036 int r;
3037
3038 tmp = pid_vnr(cad_pid);
3039
3040 r = __do_proc_dointvec(&tmp, table, write, buffer,
3041 lenp, ppos, NULL, NULL);
3042 if (r || !write)
3043 return r;
3044
3045 new_pid = find_get_pid(tmp);
3046 if (!new_pid)
3047 return -ESRCH;
3048
3049 put_pid(xchg(&cad_pid, new_pid));
3050 return 0;
3051 }
3052
3053 /**
3054 * proc_do_large_bitmap - read/write from/to a large bitmap
3055 * @table: the sysctl table
3056 * @write: %TRUE if this is a write to the sysctl file
3057 * @buffer: the user buffer
3058 * @lenp: the size of the user buffer
3059 * @ppos: file position
3060 *
3061 * The bitmap is stored at table->data and the bitmap length (in bits)
3062 * in table->maxlen.
3063 *
3064 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
3065 * large bitmaps may be represented in a compact manner. Writing into
3066 * the file will clear the bitmap then update it with the given input.
3067 *
3068 * Returns 0 on success.
3069 */
3070 int proc_do_large_bitmap(struct ctl_table *table, int write,
3071 void __user *buffer, size_t *lenp, loff_t *ppos)
3072 {
3073 int err = 0;
3074 bool first = 1;
3075 size_t left = *lenp;
3076 unsigned long bitmap_len = table->maxlen;
3077 unsigned long *bitmap = *(unsigned long **) table->data;
3078 unsigned long *tmp_bitmap = NULL;
3079 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
3080
3081 if (!bitmap || !bitmap_len || !left || (*ppos && !write)) {
3082 *lenp = 0;
3083 return 0;
3084 }
3085
3086 if (write) {
3087 char *kbuf, *p;
3088
3089 if (left > PAGE_SIZE - 1)
3090 left = PAGE_SIZE - 1;
3091
3092 p = kbuf = memdup_user_nul(buffer, left);
3093 if (IS_ERR(kbuf))
3094 return PTR_ERR(kbuf);
3095
3096 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
3097 GFP_KERNEL);
3098 if (!tmp_bitmap) {
3099 kfree(kbuf);
3100 return -ENOMEM;
3101 }
3102 proc_skip_char(&p, &left, '\n');
3103 while (!err && left) {
3104 unsigned long val_a, val_b;
3105 bool neg;
3106
3107 err = proc_get_long(&p, &left, &val_a, &neg, tr_a,
3108 sizeof(tr_a), &c);
3109 if (err)
3110 break;
3111 if (val_a >= bitmap_len || neg) {
3112 err = -EINVAL;
3113 break;
3114 }
3115
3116 val_b = val_a;
3117 if (left) {
3118 p++;
3119 left--;
3120 }
3121
3122 if (c == '-') {
3123 err = proc_get_long(&p, &left, &val_b,
3124 &neg, tr_b, sizeof(tr_b),
3125 &c);
3126 if (err)
3127 break;
3128 if (val_b >= bitmap_len || neg ||
3129 val_a > val_b) {
3130 err = -EINVAL;
3131 break;
3132 }
3133 if (left) {
3134 p++;
3135 left--;
3136 }
3137 }
3138
3139 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
3140 first = 0;
3141 proc_skip_char(&p, &left, '\n');
3142 }
3143 kfree(kbuf);
3144 } else {
3145 unsigned long bit_a, bit_b = 0;
3146
3147 while (left) {
3148 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
3149 if (bit_a >= bitmap_len)
3150 break;
3151 bit_b = find_next_zero_bit(bitmap, bitmap_len,
3152 bit_a + 1) - 1;
3153
3154 if (!first) {
3155 err = proc_put_char(&buffer, &left, ',');
3156 if (err)
3157 break;
3158 }
3159 err = proc_put_long(&buffer, &left, bit_a, false);
3160 if (err)
3161 break;
3162 if (bit_a != bit_b) {
3163 err = proc_put_char(&buffer, &left, '-');
3164 if (err)
3165 break;
3166 err = proc_put_long(&buffer, &left, bit_b, false);
3167 if (err)
3168 break;
3169 }
3170
3171 first = 0; bit_b++;
3172 }
3173 if (!err)
3174 err = proc_put_char(&buffer, &left, '\n');
3175 }
3176
3177 if (!err) {
3178 if (write) {
3179 if (*ppos)
3180 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
3181 else
3182 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
3183 }
3184 *lenp -= left;
3185 *ppos += *lenp;
3186 }
3187
3188 kfree(tmp_bitmap);
3189 return err;
3190 }
3191
3192 #else /* CONFIG_PROC_SYSCTL */
3193
3194 int proc_dostring(struct ctl_table *table, int write,
3195 void __user *buffer, size_t *lenp, loff_t *ppos)
3196 {
3197 return -ENOSYS;
3198 }
3199
3200 int proc_dointvec(struct ctl_table *table, int write,
3201 void __user *buffer, size_t *lenp, loff_t *ppos)
3202 {
3203 return -ENOSYS;
3204 }
3205
3206 int proc_douintvec(struct ctl_table *table, int write,
3207 void __user *buffer, size_t *lenp, loff_t *ppos)
3208 {
3209 return -ENOSYS;
3210 }
3211
3212 int proc_dointvec_minmax(struct ctl_table *table, int write,
3213 void __user *buffer, size_t *lenp, loff_t *ppos)
3214 {
3215 return -ENOSYS;
3216 }
3217
3218 int proc_douintvec_minmax(struct ctl_table *table, int write,
3219 void __user *buffer, size_t *lenp, loff_t *ppos)
3220 {
3221 return -ENOSYS;
3222 }
3223
3224 int proc_dopipe_max_size(struct ctl_table *table, int write,
3225 void __user *buffer, size_t *lenp, loff_t *ppos)
3226 {
3227 return -ENOSYS;
3228 }
3229
3230 int proc_dointvec_jiffies(struct ctl_table *table, int write,
3231 void __user *buffer, size_t *lenp, loff_t *ppos)
3232 {
3233 return -ENOSYS;
3234 }
3235
3236 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
3237 void __user *buffer, size_t *lenp, loff_t *ppos)
3238 {
3239 return -ENOSYS;
3240 }
3241
3242 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
3243 void __user *buffer, size_t *lenp, loff_t *ppos)
3244 {
3245 return -ENOSYS;
3246 }
3247
3248 int proc_doulongvec_minmax(struct ctl_table *table, int write,
3249 void __user *buffer, size_t *lenp, loff_t *ppos)
3250 {
3251 return -ENOSYS;
3252 }
3253
3254 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
3255 void __user *buffer,
3256 size_t *lenp, loff_t *ppos)
3257 {
3258 return -ENOSYS;
3259 }
3260
3261
3262 #endif /* CONFIG_PROC_SYSCTL */
3263
3264 /*
3265 * No sense putting this after each symbol definition, twice,
3266 * exception granted :-)
3267 */
3268 EXPORT_SYMBOL(proc_dointvec);
3269 EXPORT_SYMBOL(proc_douintvec);
3270 EXPORT_SYMBOL(proc_dointvec_jiffies);
3271 EXPORT_SYMBOL(proc_dointvec_minmax);
3272 EXPORT_SYMBOL_GPL(proc_douintvec_minmax);
3273 EXPORT_SYMBOL_GPL(proc_dopipe_max_size);
3274 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
3275 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
3276 EXPORT_SYMBOL(proc_dostring);
3277 EXPORT_SYMBOL(proc_doulongvec_minmax);
3278 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
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