1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * sysctl.c: General linux system control interface
4 *
5 * Begun 24 March 1995, Stephen Tweedie
6 * Added /proc support, Dec 1995
7 * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
8 * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
9 * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
10 * Dynamic registration fixes, Stephen Tweedie.
11 * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
12 * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
13 * Horn.
14 * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
15 * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
16 * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
17 * Wendling.
18 * The list_for_each() macro wasn't appropriate for the sysctl loop.
19 * Removed it and replaced it with older style, 03/23/00, Bill Wendling
20 */
21
22 #include <linux/module.h>
23 #include <linux/aio.h>
24 #include <linux/mm.h>
25 #include <linux/swap.h>
26 #include <linux/slab.h>
27 #include <linux/sysctl.h>
28 #include <linux/bitmap.h>
29 #include <linux/signal.h>
30 #include <linux/printk.h>
31 #include <linux/proc_fs.h>
32 #include <linux/security.h>
33 #include <linux/ctype.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 #include <linux/userfaultfd_k.h>
71
72 #include "../lib/kstrtox.h"
73
74 #include <linux/uaccess.h>
75 #include <asm/processor.h>
76
77 #ifdef CONFIG_X86
78 #include <asm/nmi.h>
79 #include <asm/stacktrace.h>
80 #include <asm/io.h>
81 #endif
82 #ifdef CONFIG_SPARC
83 #include <asm/setup.h>
84 #endif
85 #ifdef CONFIG_BSD_PROCESS_ACCT
86 #include <linux/acct.h>
87 #endif
88 #ifdef CONFIG_RT_MUTEXES
89 #include <linux/rtmutex.h>
90 #endif
91 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
92 #include <linux/lockdep.h>
93 #endif
94 #ifdef CONFIG_CHR_DEV_SG
95 #include <scsi/sg.h>
96 #endif
97 #ifdef CONFIG_STACKLEAK_RUNTIME_DISABLE
98 #include <linux/stackleak.h>
99 #endif
100 #ifdef CONFIG_LOCKUP_DETECTOR
101 #include <linux/nmi.h>
102 #endif
103
104 #if defined(CONFIG_SYSCTL)
105
106 /* External variables not in a header file. */
107 extern int suid_dumpable;
108 #ifdef CONFIG_COREDUMP
109 extern int core_uses_pid;
110 extern char core_pattern[];
111 extern unsigned int core_pipe_limit;
112 #endif
113 extern int pid_max;
114 extern int extra_free_kbytes;
115 extern int pid_max_min, pid_max_max;
116 extern int percpu_pagelist_fraction;
117 extern int latencytop_enabled;
118 extern unsigned int sysctl_nr_open_min, sysctl_nr_open_max;
119 #ifndef CONFIG_MMU
120 extern int sysctl_nr_trim_pages;
121 #endif
122
123 /* Constants used for minimum and maximum */
124 #ifdef CONFIG_LOCKUP_DETECTOR
125 static int sixty = 60;
126 #endif
127
128 static int __maybe_unused neg_one = -1;
129 static int __maybe_unused two = 2;
130 static int __maybe_unused four = 4;
131 static unsigned long zero_ul;
132 static unsigned long one_ul = 1;
133 static unsigned long long_max = LONG_MAX;
134 static int one_hundred = 100;
135 static int one_thousand = 1000;
136 #ifdef CONFIG_PRINTK
137 static int ten_thousand = 10000;
138 #endif
139 #ifdef CONFIG_PERF_EVENTS
140 static int six_hundred_forty_kb = 640 * 1024;
141 #endif
142
143 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
144 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
145
146 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
147 static int maxolduid = 65535;
148 static int minolduid;
149
150 static int ngroups_max = NGROUPS_MAX;
151 static const int cap_last_cap = CAP_LAST_CAP;
152
153 /*
154 * This is needed for proc_doulongvec_minmax of sysctl_hung_task_timeout_secs
155 * and hung_task_check_interval_secs
156 */
157 #ifdef CONFIG_DETECT_HUNG_TASK
158 static unsigned long hung_task_timeout_max = (LONG_MAX/HZ);
159 #endif
160
161 #ifdef CONFIG_INOTIFY_USER
162 #include <linux/inotify.h>
163 #endif
164 #ifdef CONFIG_SPARC
165 #endif
166
167 #ifdef CONFIG_PARISC
168 extern int pwrsw_enabled;
169 #endif
170
171 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
172 extern int unaligned_enabled;
173 #endif
174
175 #ifdef CONFIG_IA64
176 extern int unaligned_dump_stack;
177 #endif
178
179 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
180 extern int no_unaligned_warning;
181 #endif
182
183 #ifdef CONFIG_PROC_SYSCTL
184
185 /**
186 * enum sysctl_writes_mode - supported sysctl write modes
187 *
188 * @SYSCTL_WRITES_LEGACY: each write syscall must fully contain the sysctl value
189 * to be written, and multiple writes on the same sysctl file descriptor
190 * will rewrite the sysctl value, regardless of file position. No warning
191 * is issued when the initial position is not 0.
192 * @SYSCTL_WRITES_WARN: same as above but warn when the initial file position is
193 * not 0.
194 * @SYSCTL_WRITES_STRICT: writes to numeric sysctl entries must always be at
195 * file position 0 and the value must be fully contained in the buffer
196 * sent to the write syscall. If dealing with strings respect the file
197 * position, but restrict this to the max length of the buffer, anything
198 * passed the max length will be ignored. Multiple writes will append
199 * to the buffer.
200 *
201 * These write modes control how current file position affects the behavior of
202 * updating sysctl values through the proc interface on each write.
203 */
204 enum sysctl_writes_mode {
205 SYSCTL_WRITES_LEGACY = -1,
206 SYSCTL_WRITES_WARN = 0,
207 SYSCTL_WRITES_STRICT = 1,
208 };
209
210 static enum sysctl_writes_mode sysctl_writes_strict = SYSCTL_WRITES_STRICT;
211
212 static int proc_do_cad_pid(struct ctl_table *table, int write,
213 void __user *buffer, size_t *lenp, loff_t *ppos);
214 static int proc_taint(struct ctl_table *table, int write,
215 void __user *buffer, size_t *lenp, loff_t *ppos);
216 #endif
217
218 #ifdef CONFIG_PRINTK
219 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
220 void __user *buffer, size_t *lenp, loff_t *ppos);
221 #endif
222
223 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
224 void __user *buffer, size_t *lenp, loff_t *ppos);
225 #ifdef CONFIG_COREDUMP
226 static int proc_dostring_coredump(struct ctl_table *table, int write,
227 void __user *buffer, size_t *lenp, loff_t *ppos);
228 #endif
229 static int proc_dopipe_max_size(struct ctl_table *table, int write,
230 void __user *buffer, size_t *lenp, loff_t *ppos);
231
232 #ifdef CONFIG_MAGIC_SYSRQ
233 /* Note: sysrq code uses its own private copy */
234 static int __sysrq_enabled = CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE;
235
sysrq_sysctl_handler(struct ctl_table * table,int write,void __user * buffer,size_t * lenp,loff_t * ppos)236 static int sysrq_sysctl_handler(struct ctl_table *table, int write,
237 void __user *buffer, size_t *lenp,
238 loff_t *ppos)
239 {
240 int error;
241
242 error = proc_dointvec(table, write, buffer, lenp, ppos);
243 if (error)
244 return error;
245
246 if (write)
247 sysrq_toggle_support(__sysrq_enabled);
248
249 return 0;
250 }
251
252 #endif
253
254 static struct ctl_table kern_table[];
255 static struct ctl_table vm_table[];
256 static struct ctl_table fs_table[];
257 static struct ctl_table debug_table[];
258 static struct ctl_table dev_table[];
259 extern struct ctl_table random_table[];
260 #ifdef CONFIG_EPOLL
261 extern struct ctl_table epoll_table[];
262 #endif
263
264 #ifdef CONFIG_FW_LOADER_USER_HELPER
265 extern struct ctl_table firmware_config_table[];
266 #endif
267
268 #if defined(HAVE_ARCH_PICK_MMAP_LAYOUT) || \
269 defined(CONFIG_ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT)
270 int sysctl_legacy_va_layout;
271 #endif
272
273 /* The default sysctl tables: */
274
275 static struct ctl_table sysctl_base_table[] = {
276 {
277 .procname = "kernel",
278 .mode = 0555,
279 .child = kern_table,
280 },
281 {
282 .procname = "vm",
283 .mode = 0555,
284 .child = vm_table,
285 },
286 {
287 .procname = "fs",
288 .mode = 0555,
289 .child = fs_table,
290 },
291 {
292 .procname = "debug",
293 .mode = 0555,
294 .child = debug_table,
295 },
296 {
297 .procname = "dev",
298 .mode = 0555,
299 .child = dev_table,
300 },
301 { }
302 };
303
304 #ifdef CONFIG_SCHED_DEBUG
305 static int min_sched_granularity_ns = 100000; /* 100 usecs */
306 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
307 static int min_wakeup_granularity_ns; /* 0 usecs */
308 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
309 #ifdef CONFIG_SMP
310 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
311 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
312 #endif /* CONFIG_SMP */
313 #endif /* CONFIG_SCHED_DEBUG */
314
315 #ifdef CONFIG_COMPACTION
316 static int min_extfrag_threshold;
317 static int max_extfrag_threshold = 1000;
318 #endif
319
320 static struct ctl_table kern_table[] = {
321 {
322 .procname = "sched_child_runs_first",
323 .data = &sysctl_sched_child_runs_first,
324 .maxlen = sizeof(unsigned int),
325 .mode = 0644,
326 .proc_handler = proc_dointvec,
327 },
328 #ifdef CONFIG_SCHED_DEBUG
329 {
330 .procname = "sched_min_granularity_ns",
331 .data = &sysctl_sched_min_granularity,
332 .maxlen = sizeof(unsigned int),
333 .mode = 0644,
334 .proc_handler = sched_proc_update_handler,
335 .extra1 = &min_sched_granularity_ns,
336 .extra2 = &max_sched_granularity_ns,
337 },
338 {
339 .procname = "sched_latency_ns",
340 .data = &sysctl_sched_latency,
341 .maxlen = sizeof(unsigned int),
342 .mode = 0644,
343 .proc_handler = sched_proc_update_handler,
344 .extra1 = &min_sched_granularity_ns,
345 .extra2 = &max_sched_granularity_ns,
346 },
347 {
348 .procname = "sched_wakeup_granularity_ns",
349 .data = &sysctl_sched_wakeup_granularity,
350 .maxlen = sizeof(unsigned int),
351 .mode = 0644,
352 .proc_handler = sched_proc_update_handler,
353 .extra1 = &min_wakeup_granularity_ns,
354 .extra2 = &max_wakeup_granularity_ns,
355 },
356 #ifdef CONFIG_SMP
357 {
358 .procname = "sched_tunable_scaling",
359 .data = &sysctl_sched_tunable_scaling,
360 .maxlen = sizeof(enum sched_tunable_scaling),
361 .mode = 0644,
362 .proc_handler = sched_proc_update_handler,
363 .extra1 = &min_sched_tunable_scaling,
364 .extra2 = &max_sched_tunable_scaling,
365 },
366 {
367 .procname = "sched_migration_cost_ns",
368 .data = &sysctl_sched_migration_cost,
369 .maxlen = sizeof(unsigned int),
370 .mode = 0644,
371 .proc_handler = proc_dointvec,
372 },
373 {
374 .procname = "sched_nr_migrate",
375 .data = &sysctl_sched_nr_migrate,
376 .maxlen = sizeof(unsigned int),
377 .mode = 0644,
378 .proc_handler = proc_dointvec,
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 = SYSCTL_ZERO,
388 .extra2 = SYSCTL_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 = SYSCTL_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 = SYSCTL_ZERO,
429 .extra2 = SYSCTL_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_UCLAMP_TASK
455 {
456 .procname = "sched_util_clamp_min",
457 .data = &sysctl_sched_uclamp_util_min,
458 .maxlen = sizeof(unsigned int),
459 .mode = 0644,
460 .proc_handler = sysctl_sched_uclamp_handler,
461 },
462 {
463 .procname = "sched_util_clamp_max",
464 .data = &sysctl_sched_uclamp_util_max,
465 .maxlen = sizeof(unsigned int),
466 .mode = 0644,
467 .proc_handler = sysctl_sched_uclamp_handler,
468 },
469 #endif
470 #ifdef CONFIG_SCHED_AUTOGROUP
471 {
472 .procname = "sched_autogroup_enabled",
473 .data = &sysctl_sched_autogroup_enabled,
474 .maxlen = sizeof(unsigned int),
475 .mode = 0644,
476 .proc_handler = proc_dointvec_minmax,
477 .extra1 = SYSCTL_ZERO,
478 .extra2 = SYSCTL_ONE,
479 },
480 #endif
481 #ifdef CONFIG_CFS_BANDWIDTH
482 {
483 .procname = "sched_cfs_bandwidth_slice_us",
484 .data = &sysctl_sched_cfs_bandwidth_slice,
485 .maxlen = sizeof(unsigned int),
486 .mode = 0644,
487 .proc_handler = proc_dointvec_minmax,
488 .extra1 = SYSCTL_ONE,
489 },
490 #endif
491 #if defined(CONFIG_ENERGY_MODEL) && defined(CONFIG_CPU_FREQ_GOV_SCHEDUTIL)
492 {
493 .procname = "sched_energy_aware",
494 .data = &sysctl_sched_energy_aware,
495 .maxlen = sizeof(unsigned int),
496 .mode = 0644,
497 .proc_handler = sched_energy_aware_handler,
498 .extra1 = SYSCTL_ZERO,
499 .extra2 = SYSCTL_ONE,
500 },
501 #endif
502 #ifdef CONFIG_PROVE_LOCKING
503 {
504 .procname = "prove_locking",
505 .data = &prove_locking,
506 .maxlen = sizeof(int),
507 .mode = 0644,
508 .proc_handler = proc_dointvec,
509 },
510 #endif
511 #ifdef CONFIG_LOCK_STAT
512 {
513 .procname = "lock_stat",
514 .data = &lock_stat,
515 .maxlen = sizeof(int),
516 .mode = 0644,
517 .proc_handler = proc_dointvec,
518 },
519 #endif
520 {
521 .procname = "panic",
522 .data = &panic_timeout,
523 .maxlen = sizeof(int),
524 .mode = 0644,
525 .proc_handler = proc_dointvec,
526 },
527 #ifdef CONFIG_COREDUMP
528 {
529 .procname = "core_uses_pid",
530 .data = &core_uses_pid,
531 .maxlen = sizeof(int),
532 .mode = 0644,
533 .proc_handler = proc_dointvec,
534 },
535 {
536 .procname = "core_pattern",
537 .data = core_pattern,
538 .maxlen = CORENAME_MAX_SIZE,
539 .mode = 0644,
540 .proc_handler = proc_dostring_coredump,
541 },
542 {
543 .procname = "core_pipe_limit",
544 .data = &core_pipe_limit,
545 .maxlen = sizeof(unsigned int),
546 .mode = 0644,
547 .proc_handler = proc_dointvec,
548 },
549 #endif
550 #ifdef CONFIG_PROC_SYSCTL
551 {
552 .procname = "tainted",
553 .maxlen = sizeof(long),
554 .mode = 0644,
555 .proc_handler = proc_taint,
556 },
557 {
558 .procname = "sysctl_writes_strict",
559 .data = &sysctl_writes_strict,
560 .maxlen = sizeof(int),
561 .mode = 0644,
562 .proc_handler = proc_dointvec_minmax,
563 .extra1 = &neg_one,
564 .extra2 = SYSCTL_ONE,
565 },
566 #endif
567 #ifdef CONFIG_LATENCYTOP
568 {
569 .procname = "latencytop",
570 .data = &latencytop_enabled,
571 .maxlen = sizeof(int),
572 .mode = 0644,
573 .proc_handler = sysctl_latencytop,
574 },
575 #endif
576 #ifdef CONFIG_BLK_DEV_INITRD
577 {
578 .procname = "real-root-dev",
579 .data = &real_root_dev,
580 .maxlen = sizeof(int),
581 .mode = 0644,
582 .proc_handler = proc_dointvec,
583 },
584 #endif
585 {
586 .procname = "print-fatal-signals",
587 .data = &print_fatal_signals,
588 .maxlen = sizeof(int),
589 .mode = 0644,
590 .proc_handler = proc_dointvec,
591 },
592 #ifdef CONFIG_SPARC
593 {
594 .procname = "reboot-cmd",
595 .data = reboot_command,
596 .maxlen = 256,
597 .mode = 0644,
598 .proc_handler = proc_dostring,
599 },
600 {
601 .procname = "stop-a",
602 .data = &stop_a_enabled,
603 .maxlen = sizeof (int),
604 .mode = 0644,
605 .proc_handler = proc_dointvec,
606 },
607 {
608 .procname = "scons-poweroff",
609 .data = &scons_pwroff,
610 .maxlen = sizeof (int),
611 .mode = 0644,
612 .proc_handler = proc_dointvec,
613 },
614 #endif
615 #ifdef CONFIG_SPARC64
616 {
617 .procname = "tsb-ratio",
618 .data = &sysctl_tsb_ratio,
619 .maxlen = sizeof (int),
620 .mode = 0644,
621 .proc_handler = proc_dointvec,
622 },
623 #endif
624 #ifdef CONFIG_PARISC
625 {
626 .procname = "soft-power",
627 .data = &pwrsw_enabled,
628 .maxlen = sizeof (int),
629 .mode = 0644,
630 .proc_handler = proc_dointvec,
631 },
632 #endif
633 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
634 {
635 .procname = "unaligned-trap",
636 .data = &unaligned_enabled,
637 .maxlen = sizeof (int),
638 .mode = 0644,
639 .proc_handler = proc_dointvec,
640 },
641 #endif
642 {
643 .procname = "ctrl-alt-del",
644 .data = &C_A_D,
645 .maxlen = sizeof(int),
646 .mode = 0644,
647 .proc_handler = proc_dointvec,
648 },
649 #ifdef CONFIG_FUNCTION_TRACER
650 {
651 .procname = "ftrace_enabled",
652 .data = &ftrace_enabled,
653 .maxlen = sizeof(int),
654 .mode = 0644,
655 .proc_handler = ftrace_enable_sysctl,
656 },
657 #endif
658 #ifdef CONFIG_STACK_TRACER
659 {
660 .procname = "stack_tracer_enabled",
661 .data = &stack_tracer_enabled,
662 .maxlen = sizeof(int),
663 .mode = 0644,
664 .proc_handler = stack_trace_sysctl,
665 },
666 #endif
667 #ifdef CONFIG_TRACING
668 {
669 .procname = "ftrace_dump_on_oops",
670 .data = &ftrace_dump_on_oops,
671 .maxlen = sizeof(int),
672 .mode = 0644,
673 .proc_handler = proc_dointvec,
674 },
675 {
676 .procname = "traceoff_on_warning",
677 .data = &__disable_trace_on_warning,
678 .maxlen = sizeof(__disable_trace_on_warning),
679 .mode = 0644,
680 .proc_handler = proc_dointvec,
681 },
682 {
683 .procname = "tracepoint_printk",
684 .data = &tracepoint_printk,
685 .maxlen = sizeof(tracepoint_printk),
686 .mode = 0644,
687 .proc_handler = tracepoint_printk_sysctl,
688 },
689 #endif
690 #ifdef CONFIG_KEXEC_CORE
691 {
692 .procname = "kexec_load_disabled",
693 .data = &kexec_load_disabled,
694 .maxlen = sizeof(int),
695 .mode = 0644,
696 /* only handle a transition from default "0" to "1" */
697 .proc_handler = proc_dointvec_minmax,
698 .extra1 = SYSCTL_ONE,
699 .extra2 = SYSCTL_ONE,
700 },
701 #endif
702 #ifdef CONFIG_MODULES
703 {
704 .procname = "modprobe",
705 .data = &modprobe_path,
706 .maxlen = KMOD_PATH_LEN,
707 .mode = 0644,
708 .proc_handler = proc_dostring,
709 },
710 {
711 .procname = "modules_disabled",
712 .data = &modules_disabled,
713 .maxlen = sizeof(int),
714 .mode = 0644,
715 /* only handle a transition from default "0" to "1" */
716 .proc_handler = proc_dointvec_minmax,
717 .extra1 = SYSCTL_ONE,
718 .extra2 = SYSCTL_ONE,
719 },
720 #endif
721 #ifdef CONFIG_UEVENT_HELPER
722 {
723 .procname = "hotplug",
724 .data = &uevent_helper,
725 .maxlen = UEVENT_HELPER_PATH_LEN,
726 .mode = 0644,
727 .proc_handler = proc_dostring,
728 },
729 #endif
730 #ifdef CONFIG_CHR_DEV_SG
731 {
732 .procname = "sg-big-buff",
733 .data = &sg_big_buff,
734 .maxlen = sizeof (int),
735 .mode = 0444,
736 .proc_handler = proc_dointvec,
737 },
738 #endif
739 #ifdef CONFIG_BSD_PROCESS_ACCT
740 {
741 .procname = "acct",
742 .data = &acct_parm,
743 .maxlen = 3*sizeof(int),
744 .mode = 0644,
745 .proc_handler = proc_dointvec,
746 },
747 #endif
748 #ifdef CONFIG_MAGIC_SYSRQ
749 {
750 .procname = "sysrq",
751 .data = &__sysrq_enabled,
752 .maxlen = sizeof (int),
753 .mode = 0644,
754 .proc_handler = sysrq_sysctl_handler,
755 },
756 #endif
757 #ifdef CONFIG_PROC_SYSCTL
758 {
759 .procname = "cad_pid",
760 .data = NULL,
761 .maxlen = sizeof (int),
762 .mode = 0600,
763 .proc_handler = proc_do_cad_pid,
764 },
765 #endif
766 {
767 .procname = "threads-max",
768 .data = NULL,
769 .maxlen = sizeof(int),
770 .mode = 0644,
771 .proc_handler = sysctl_max_threads,
772 },
773 {
774 .procname = "random",
775 .mode = 0555,
776 .child = random_table,
777 },
778 {
779 .procname = "usermodehelper",
780 .mode = 0555,
781 .child = usermodehelper_table,
782 },
783 #ifdef CONFIG_FW_LOADER_USER_HELPER
784 {
785 .procname = "firmware_config",
786 .mode = 0555,
787 .child = firmware_config_table,
788 },
789 #endif
790 {
791 .procname = "overflowuid",
792 .data = &overflowuid,
793 .maxlen = sizeof(int),
794 .mode = 0644,
795 .proc_handler = proc_dointvec_minmax,
796 .extra1 = &minolduid,
797 .extra2 = &maxolduid,
798 },
799 {
800 .procname = "overflowgid",
801 .data = &overflowgid,
802 .maxlen = sizeof(int),
803 .mode = 0644,
804 .proc_handler = proc_dointvec_minmax,
805 .extra1 = &minolduid,
806 .extra2 = &maxolduid,
807 },
808 #ifdef CONFIG_S390
809 #ifdef CONFIG_MATHEMU
810 {
811 .procname = "ieee_emulation_warnings",
812 .data = &sysctl_ieee_emulation_warnings,
813 .maxlen = sizeof(int),
814 .mode = 0644,
815 .proc_handler = proc_dointvec,
816 },
817 #endif
818 {
819 .procname = "userprocess_debug",
820 .data = &show_unhandled_signals,
821 .maxlen = sizeof(int),
822 .mode = 0644,
823 .proc_handler = proc_dointvec,
824 },
825 #endif
826 {
827 .procname = "pid_max",
828 .data = &pid_max,
829 .maxlen = sizeof (int),
830 .mode = 0644,
831 .proc_handler = proc_dointvec_minmax,
832 .extra1 = &pid_max_min,
833 .extra2 = &pid_max_max,
834 },
835 {
836 .procname = "panic_on_oops",
837 .data = &panic_on_oops,
838 .maxlen = sizeof(int),
839 .mode = 0644,
840 .proc_handler = proc_dointvec,
841 },
842 {
843 .procname = "panic_print",
844 .data = &panic_print,
845 .maxlen = sizeof(unsigned long),
846 .mode = 0644,
847 .proc_handler = proc_doulongvec_minmax,
848 },
849 #if defined CONFIG_PRINTK
850 {
851 .procname = "printk",
852 .data = &console_loglevel,
853 .maxlen = 4*sizeof(int),
854 .mode = 0644,
855 .proc_handler = proc_dointvec,
856 },
857 {
858 .procname = "printk_ratelimit",
859 .data = &printk_ratelimit_state.interval,
860 .maxlen = sizeof(int),
861 .mode = 0644,
862 .proc_handler = proc_dointvec_jiffies,
863 },
864 {
865 .procname = "printk_ratelimit_burst",
866 .data = &printk_ratelimit_state.burst,
867 .maxlen = sizeof(int),
868 .mode = 0644,
869 .proc_handler = proc_dointvec,
870 },
871 {
872 .procname = "printk_delay",
873 .data = &printk_delay_msec,
874 .maxlen = sizeof(int),
875 .mode = 0644,
876 .proc_handler = proc_dointvec_minmax,
877 .extra1 = SYSCTL_ZERO,
878 .extra2 = &ten_thousand,
879 },
880 {
881 .procname = "printk_devkmsg",
882 .data = devkmsg_log_str,
883 .maxlen = DEVKMSG_STR_MAX_SIZE,
884 .mode = 0644,
885 .proc_handler = devkmsg_sysctl_set_loglvl,
886 },
887 {
888 .procname = "dmesg_restrict",
889 .data = &dmesg_restrict,
890 .maxlen = sizeof(int),
891 .mode = 0644,
892 .proc_handler = proc_dointvec_minmax_sysadmin,
893 .extra1 = SYSCTL_ZERO,
894 .extra2 = SYSCTL_ONE,
895 },
896 {
897 .procname = "kptr_restrict",
898 .data = &kptr_restrict,
899 .maxlen = sizeof(int),
900 .mode = 0644,
901 .proc_handler = proc_dointvec_minmax_sysadmin,
902 .extra1 = SYSCTL_ZERO,
903 .extra2 = &two,
904 },
905 #endif
906 {
907 .procname = "ngroups_max",
908 .data = &ngroups_max,
909 .maxlen = sizeof (int),
910 .mode = 0444,
911 .proc_handler = proc_dointvec,
912 },
913 {
914 .procname = "cap_last_cap",
915 .data = (void *)&cap_last_cap,
916 .maxlen = sizeof(int),
917 .mode = 0444,
918 .proc_handler = proc_dointvec,
919 },
920 #if defined(CONFIG_LOCKUP_DETECTOR)
921 {
922 .procname = "watchdog",
923 .data = &watchdog_user_enabled,
924 .maxlen = sizeof(int),
925 .mode = 0644,
926 .proc_handler = proc_watchdog,
927 .extra1 = SYSCTL_ZERO,
928 .extra2 = SYSCTL_ONE,
929 },
930 {
931 .procname = "watchdog_thresh",
932 .data = &watchdog_thresh,
933 .maxlen = sizeof(int),
934 .mode = 0644,
935 .proc_handler = proc_watchdog_thresh,
936 .extra1 = SYSCTL_ZERO,
937 .extra2 = &sixty,
938 },
939 {
940 .procname = "nmi_watchdog",
941 .data = &nmi_watchdog_user_enabled,
942 .maxlen = sizeof(int),
943 .mode = NMI_WATCHDOG_SYSCTL_PERM,
944 .proc_handler = proc_nmi_watchdog,
945 .extra1 = SYSCTL_ZERO,
946 .extra2 = SYSCTL_ONE,
947 },
948 {
949 .procname = "watchdog_cpumask",
950 .data = &watchdog_cpumask_bits,
951 .maxlen = NR_CPUS,
952 .mode = 0644,
953 .proc_handler = proc_watchdog_cpumask,
954 },
955 #ifdef CONFIG_SOFTLOCKUP_DETECTOR
956 {
957 .procname = "soft_watchdog",
958 .data = &soft_watchdog_user_enabled,
959 .maxlen = sizeof(int),
960 .mode = 0644,
961 .proc_handler = proc_soft_watchdog,
962 .extra1 = SYSCTL_ZERO,
963 .extra2 = SYSCTL_ONE,
964 },
965 {
966 .procname = "softlockup_panic",
967 .data = &softlockup_panic,
968 .maxlen = sizeof(int),
969 .mode = 0644,
970 .proc_handler = proc_dointvec_minmax,
971 .extra1 = SYSCTL_ZERO,
972 .extra2 = SYSCTL_ONE,
973 },
974 #ifdef CONFIG_SMP
975 {
976 .procname = "softlockup_all_cpu_backtrace",
977 .data = &sysctl_softlockup_all_cpu_backtrace,
978 .maxlen = sizeof(int),
979 .mode = 0644,
980 .proc_handler = proc_dointvec_minmax,
981 .extra1 = SYSCTL_ZERO,
982 .extra2 = SYSCTL_ONE,
983 },
984 #endif /* CONFIG_SMP */
985 #endif
986 #ifdef CONFIG_HARDLOCKUP_DETECTOR
987 {
988 .procname = "hardlockup_panic",
989 .data = &hardlockup_panic,
990 .maxlen = sizeof(int),
991 .mode = 0644,
992 .proc_handler = proc_dointvec_minmax,
993 .extra1 = SYSCTL_ZERO,
994 .extra2 = SYSCTL_ONE,
995 },
996 #ifdef CONFIG_SMP
997 {
998 .procname = "hardlockup_all_cpu_backtrace",
999 .data = &sysctl_hardlockup_all_cpu_backtrace,
1000 .maxlen = sizeof(int),
1001 .mode = 0644,
1002 .proc_handler = proc_dointvec_minmax,
1003 .extra1 = SYSCTL_ZERO,
1004 .extra2 = SYSCTL_ONE,
1005 },
1006 #endif /* CONFIG_SMP */
1007 #endif
1008 #endif
1009
1010 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
1011 {
1012 .procname = "unknown_nmi_panic",
1013 .data = &unknown_nmi_panic,
1014 .maxlen = sizeof (int),
1015 .mode = 0644,
1016 .proc_handler = proc_dointvec,
1017 },
1018 #endif
1019 #if defined(CONFIG_X86)
1020 {
1021 .procname = "panic_on_unrecovered_nmi",
1022 .data = &panic_on_unrecovered_nmi,
1023 .maxlen = sizeof(int),
1024 .mode = 0644,
1025 .proc_handler = proc_dointvec,
1026 },
1027 {
1028 .procname = "panic_on_io_nmi",
1029 .data = &panic_on_io_nmi,
1030 .maxlen = sizeof(int),
1031 .mode = 0644,
1032 .proc_handler = proc_dointvec,
1033 },
1034 #ifdef CONFIG_DEBUG_STACKOVERFLOW
1035 {
1036 .procname = "panic_on_stackoverflow",
1037 .data = &sysctl_panic_on_stackoverflow,
1038 .maxlen = sizeof(int),
1039 .mode = 0644,
1040 .proc_handler = proc_dointvec,
1041 },
1042 #endif
1043 {
1044 .procname = "bootloader_type",
1045 .data = &bootloader_type,
1046 .maxlen = sizeof (int),
1047 .mode = 0444,
1048 .proc_handler = proc_dointvec,
1049 },
1050 {
1051 .procname = "bootloader_version",
1052 .data = &bootloader_version,
1053 .maxlen = sizeof (int),
1054 .mode = 0444,
1055 .proc_handler = proc_dointvec,
1056 },
1057 {
1058 .procname = "io_delay_type",
1059 .data = &io_delay_type,
1060 .maxlen = sizeof(int),
1061 .mode = 0644,
1062 .proc_handler = proc_dointvec,
1063 },
1064 #endif
1065 #if defined(CONFIG_MMU)
1066 {
1067 .procname = "randomize_va_space",
1068 .data = &randomize_va_space,
1069 .maxlen = sizeof(int),
1070 .mode = 0644,
1071 .proc_handler = proc_dointvec,
1072 },
1073 #endif
1074 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
1075 {
1076 .procname = "spin_retry",
1077 .data = &spin_retry,
1078 .maxlen = sizeof (int),
1079 .mode = 0644,
1080 .proc_handler = proc_dointvec,
1081 },
1082 #endif
1083 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
1084 {
1085 .procname = "acpi_video_flags",
1086 .data = &acpi_realmode_flags,
1087 .maxlen = sizeof (unsigned long),
1088 .mode = 0644,
1089 .proc_handler = proc_doulongvec_minmax,
1090 },
1091 #endif
1092 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
1093 {
1094 .procname = "ignore-unaligned-usertrap",
1095 .data = &no_unaligned_warning,
1096 .maxlen = sizeof (int),
1097 .mode = 0644,
1098 .proc_handler = proc_dointvec,
1099 },
1100 #endif
1101 #ifdef CONFIG_IA64
1102 {
1103 .procname = "unaligned-dump-stack",
1104 .data = &unaligned_dump_stack,
1105 .maxlen = sizeof (int),
1106 .mode = 0644,
1107 .proc_handler = proc_dointvec,
1108 },
1109 #endif
1110 #ifdef CONFIG_DETECT_HUNG_TASK
1111 {
1112 .procname = "hung_task_panic",
1113 .data = &sysctl_hung_task_panic,
1114 .maxlen = sizeof(int),
1115 .mode = 0644,
1116 .proc_handler = proc_dointvec_minmax,
1117 .extra1 = SYSCTL_ZERO,
1118 .extra2 = SYSCTL_ONE,
1119 },
1120 {
1121 .procname = "hung_task_check_count",
1122 .data = &sysctl_hung_task_check_count,
1123 .maxlen = sizeof(int),
1124 .mode = 0644,
1125 .proc_handler = proc_dointvec_minmax,
1126 .extra1 = SYSCTL_ZERO,
1127 },
1128 {
1129 .procname = "hung_task_timeout_secs",
1130 .data = &sysctl_hung_task_timeout_secs,
1131 .maxlen = sizeof(unsigned long),
1132 .mode = 0644,
1133 .proc_handler = proc_dohung_task_timeout_secs,
1134 .extra2 = &hung_task_timeout_max,
1135 },
1136 {
1137 .procname = "hung_task_check_interval_secs",
1138 .data = &sysctl_hung_task_check_interval_secs,
1139 .maxlen = sizeof(unsigned long),
1140 .mode = 0644,
1141 .proc_handler = proc_dohung_task_timeout_secs,
1142 .extra2 = &hung_task_timeout_max,
1143 },
1144 {
1145 .procname = "hung_task_warnings",
1146 .data = &sysctl_hung_task_warnings,
1147 .maxlen = sizeof(int),
1148 .mode = 0644,
1149 .proc_handler = proc_dointvec_minmax,
1150 .extra1 = &neg_one,
1151 },
1152 #endif
1153 #ifdef CONFIG_RT_MUTEXES
1154 {
1155 .procname = "max_lock_depth",
1156 .data = &max_lock_depth,
1157 .maxlen = sizeof(int),
1158 .mode = 0644,
1159 .proc_handler = proc_dointvec,
1160 },
1161 #endif
1162 {
1163 .procname = "poweroff_cmd",
1164 .data = &poweroff_cmd,
1165 .maxlen = POWEROFF_CMD_PATH_LEN,
1166 .mode = 0644,
1167 .proc_handler = proc_dostring,
1168 },
1169 #ifdef CONFIG_KEYS
1170 {
1171 .procname = "keys",
1172 .mode = 0555,
1173 .child = key_sysctls,
1174 },
1175 #endif
1176 #ifdef CONFIG_PERF_EVENTS
1177 /*
1178 * User-space scripts rely on the existence of this file
1179 * as a feature check for perf_events being enabled.
1180 *
1181 * So it's an ABI, do not remove!
1182 */
1183 {
1184 .procname = "perf_event_paranoid",
1185 .data = &sysctl_perf_event_paranoid,
1186 .maxlen = sizeof(sysctl_perf_event_paranoid),
1187 .mode = 0644,
1188 .proc_handler = proc_dointvec,
1189 },
1190 {
1191 .procname = "perf_event_mlock_kb",
1192 .data = &sysctl_perf_event_mlock,
1193 .maxlen = sizeof(sysctl_perf_event_mlock),
1194 .mode = 0644,
1195 .proc_handler = proc_dointvec,
1196 },
1197 {
1198 .procname = "perf_event_max_sample_rate",
1199 .data = &sysctl_perf_event_sample_rate,
1200 .maxlen = sizeof(sysctl_perf_event_sample_rate),
1201 .mode = 0644,
1202 .proc_handler = perf_proc_update_handler,
1203 .extra1 = SYSCTL_ONE,
1204 },
1205 {
1206 .procname = "perf_cpu_time_max_percent",
1207 .data = &sysctl_perf_cpu_time_max_percent,
1208 .maxlen = sizeof(sysctl_perf_cpu_time_max_percent),
1209 .mode = 0644,
1210 .proc_handler = perf_cpu_time_max_percent_handler,
1211 .extra1 = SYSCTL_ZERO,
1212 .extra2 = &one_hundred,
1213 },
1214 {
1215 .procname = "perf_event_max_stack",
1216 .data = &sysctl_perf_event_max_stack,
1217 .maxlen = sizeof(sysctl_perf_event_max_stack),
1218 .mode = 0644,
1219 .proc_handler = perf_event_max_stack_handler,
1220 .extra1 = SYSCTL_ZERO,
1221 .extra2 = &six_hundred_forty_kb,
1222 },
1223 {
1224 .procname = "perf_event_max_contexts_per_stack",
1225 .data = &sysctl_perf_event_max_contexts_per_stack,
1226 .maxlen = sizeof(sysctl_perf_event_max_contexts_per_stack),
1227 .mode = 0644,
1228 .proc_handler = perf_event_max_stack_handler,
1229 .extra1 = SYSCTL_ZERO,
1230 .extra2 = &one_thousand,
1231 },
1232 #endif
1233 {
1234 .procname = "panic_on_warn",
1235 .data = &panic_on_warn,
1236 .maxlen = sizeof(int),
1237 .mode = 0644,
1238 .proc_handler = proc_dointvec_minmax,
1239 .extra1 = SYSCTL_ZERO,
1240 .extra2 = SYSCTL_ONE,
1241 },
1242 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
1243 {
1244 .procname = "timer_migration",
1245 .data = &sysctl_timer_migration,
1246 .maxlen = sizeof(unsigned int),
1247 .mode = 0644,
1248 .proc_handler = timer_migration_handler,
1249 .extra1 = SYSCTL_ZERO,
1250 .extra2 = SYSCTL_ONE,
1251 },
1252 #endif
1253 #ifdef CONFIG_BPF_SYSCALL
1254 {
1255 .procname = "unprivileged_bpf_disabled",
1256 .data = &sysctl_unprivileged_bpf_disabled,
1257 .maxlen = sizeof(sysctl_unprivileged_bpf_disabled),
1258 .mode = 0644,
1259 /* only handle a transition from default "0" to "1" */
1260 .proc_handler = proc_dointvec_minmax,
1261 .extra1 = SYSCTL_ONE,
1262 .extra2 = SYSCTL_ONE,
1263 },
1264 {
1265 .procname = "bpf_stats_enabled",
1266 .data = &bpf_stats_enabled_key.key,
1267 .maxlen = sizeof(bpf_stats_enabled_key),
1268 .mode = 0644,
1269 .proc_handler = proc_do_static_key,
1270 },
1271 #endif
1272 #if defined(CONFIG_TREE_RCU) || defined(CONFIG_PREEMPT_RCU)
1273 {
1274 .procname = "panic_on_rcu_stall",
1275 .data = &sysctl_panic_on_rcu_stall,
1276 .maxlen = sizeof(sysctl_panic_on_rcu_stall),
1277 .mode = 0644,
1278 .proc_handler = proc_dointvec_minmax,
1279 .extra1 = SYSCTL_ZERO,
1280 .extra2 = SYSCTL_ONE,
1281 },
1282 #endif
1283 #ifdef CONFIG_STACKLEAK_RUNTIME_DISABLE
1284 {
1285 .procname = "stack_erasing",
1286 .data = NULL,
1287 .maxlen = sizeof(int),
1288 .mode = 0600,
1289 .proc_handler = stack_erasing_sysctl,
1290 .extra1 = SYSCTL_ZERO,
1291 .extra2 = SYSCTL_ONE,
1292 },
1293 #endif
1294 { }
1295 };
1296
1297 static struct ctl_table vm_table[] = {
1298 {
1299 .procname = "overcommit_memory",
1300 .data = &sysctl_overcommit_memory,
1301 .maxlen = sizeof(sysctl_overcommit_memory),
1302 .mode = 0644,
1303 .proc_handler = proc_dointvec_minmax,
1304 .extra1 = SYSCTL_ZERO,
1305 .extra2 = &two,
1306 },
1307 {
1308 .procname = "panic_on_oom",
1309 .data = &sysctl_panic_on_oom,
1310 .maxlen = sizeof(sysctl_panic_on_oom),
1311 .mode = 0644,
1312 .proc_handler = proc_dointvec_minmax,
1313 .extra1 = SYSCTL_ZERO,
1314 .extra2 = &two,
1315 },
1316 {
1317 .procname = "oom_kill_allocating_task",
1318 .data = &sysctl_oom_kill_allocating_task,
1319 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1320 .mode = 0644,
1321 .proc_handler = proc_dointvec,
1322 },
1323 {
1324 .procname = "oom_dump_tasks",
1325 .data = &sysctl_oom_dump_tasks,
1326 .maxlen = sizeof(sysctl_oom_dump_tasks),
1327 .mode = 0644,
1328 .proc_handler = proc_dointvec,
1329 },
1330 {
1331 .procname = "overcommit_ratio",
1332 .data = &sysctl_overcommit_ratio,
1333 .maxlen = sizeof(sysctl_overcommit_ratio),
1334 .mode = 0644,
1335 .proc_handler = overcommit_ratio_handler,
1336 },
1337 {
1338 .procname = "overcommit_kbytes",
1339 .data = &sysctl_overcommit_kbytes,
1340 .maxlen = sizeof(sysctl_overcommit_kbytes),
1341 .mode = 0644,
1342 .proc_handler = overcommit_kbytes_handler,
1343 },
1344 {
1345 .procname = "page-cluster",
1346 .data = &page_cluster,
1347 .maxlen = sizeof(int),
1348 .mode = 0644,
1349 .proc_handler = proc_dointvec_minmax,
1350 .extra1 = SYSCTL_ZERO,
1351 },
1352 {
1353 .procname = "dirty_background_ratio",
1354 .data = &dirty_background_ratio,
1355 .maxlen = sizeof(dirty_background_ratio),
1356 .mode = 0644,
1357 .proc_handler = dirty_background_ratio_handler,
1358 .extra1 = SYSCTL_ZERO,
1359 .extra2 = &one_hundred,
1360 },
1361 {
1362 .procname = "dirty_background_bytes",
1363 .data = &dirty_background_bytes,
1364 .maxlen = sizeof(dirty_background_bytes),
1365 .mode = 0644,
1366 .proc_handler = dirty_background_bytes_handler,
1367 .extra1 = &one_ul,
1368 },
1369 {
1370 .procname = "dirty_ratio",
1371 .data = &vm_dirty_ratio,
1372 .maxlen = sizeof(vm_dirty_ratio),
1373 .mode = 0644,
1374 .proc_handler = dirty_ratio_handler,
1375 .extra1 = SYSCTL_ZERO,
1376 .extra2 = &one_hundred,
1377 },
1378 {
1379 .procname = "dirty_bytes",
1380 .data = &vm_dirty_bytes,
1381 .maxlen = sizeof(vm_dirty_bytes),
1382 .mode = 0644,
1383 .proc_handler = dirty_bytes_handler,
1384 .extra1 = &dirty_bytes_min,
1385 },
1386 {
1387 .procname = "dirty_writeback_centisecs",
1388 .data = &dirty_writeback_interval,
1389 .maxlen = sizeof(dirty_writeback_interval),
1390 .mode = 0644,
1391 .proc_handler = dirty_writeback_centisecs_handler,
1392 },
1393 {
1394 .procname = "dirty_expire_centisecs",
1395 .data = &dirty_expire_interval,
1396 .maxlen = sizeof(dirty_expire_interval),
1397 .mode = 0644,
1398 .proc_handler = proc_dointvec_minmax,
1399 .extra1 = SYSCTL_ZERO,
1400 },
1401 {
1402 .procname = "dirtytime_expire_seconds",
1403 .data = &dirtytime_expire_interval,
1404 .maxlen = sizeof(dirtytime_expire_interval),
1405 .mode = 0644,
1406 .proc_handler = dirtytime_interval_handler,
1407 .extra1 = SYSCTL_ZERO,
1408 },
1409 {
1410 .procname = "swappiness",
1411 .data = &vm_swappiness,
1412 .maxlen = sizeof(vm_swappiness),
1413 .mode = 0644,
1414 .proc_handler = proc_dointvec_minmax,
1415 .extra1 = SYSCTL_ZERO,
1416 .extra2 = &one_hundred,
1417 },
1418 #ifdef CONFIG_HUGETLB_PAGE
1419 {
1420 .procname = "nr_hugepages",
1421 .data = NULL,
1422 .maxlen = sizeof(unsigned long),
1423 .mode = 0644,
1424 .proc_handler = hugetlb_sysctl_handler,
1425 },
1426 #ifdef CONFIG_NUMA
1427 {
1428 .procname = "nr_hugepages_mempolicy",
1429 .data = NULL,
1430 .maxlen = sizeof(unsigned long),
1431 .mode = 0644,
1432 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
1433 },
1434 {
1435 .procname = "numa_stat",
1436 .data = &sysctl_vm_numa_stat,
1437 .maxlen = sizeof(int),
1438 .mode = 0644,
1439 .proc_handler = sysctl_vm_numa_stat_handler,
1440 .extra1 = SYSCTL_ZERO,
1441 .extra2 = SYSCTL_ONE,
1442 },
1443 #endif
1444 {
1445 .procname = "hugetlb_shm_group",
1446 .data = &sysctl_hugetlb_shm_group,
1447 .maxlen = sizeof(gid_t),
1448 .mode = 0644,
1449 .proc_handler = proc_dointvec,
1450 },
1451 {
1452 .procname = "nr_overcommit_hugepages",
1453 .data = NULL,
1454 .maxlen = sizeof(unsigned long),
1455 .mode = 0644,
1456 .proc_handler = hugetlb_overcommit_handler,
1457 },
1458 #endif
1459 {
1460 .procname = "lowmem_reserve_ratio",
1461 .data = &sysctl_lowmem_reserve_ratio,
1462 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1463 .mode = 0644,
1464 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
1465 },
1466 {
1467 .procname = "drop_caches",
1468 .data = &sysctl_drop_caches,
1469 .maxlen = sizeof(int),
1470 .mode = 0200,
1471 .proc_handler = drop_caches_sysctl_handler,
1472 .extra1 = SYSCTL_ONE,
1473 .extra2 = &four,
1474 },
1475 #ifdef CONFIG_COMPACTION
1476 {
1477 .procname = "compact_memory",
1478 .data = &sysctl_compact_memory,
1479 .maxlen = sizeof(int),
1480 .mode = 0200,
1481 .proc_handler = sysctl_compaction_handler,
1482 },
1483 {
1484 .procname = "extfrag_threshold",
1485 .data = &sysctl_extfrag_threshold,
1486 .maxlen = sizeof(int),
1487 .mode = 0644,
1488 .proc_handler = proc_dointvec_minmax,
1489 .extra1 = &min_extfrag_threshold,
1490 .extra2 = &max_extfrag_threshold,
1491 },
1492 {
1493 .procname = "compact_unevictable_allowed",
1494 .data = &sysctl_compact_unevictable_allowed,
1495 .maxlen = sizeof(int),
1496 .mode = 0644,
1497 .proc_handler = proc_dointvec,
1498 .extra1 = SYSCTL_ZERO,
1499 .extra2 = SYSCTL_ONE,
1500 },
1501
1502 #endif /* CONFIG_COMPACTION */
1503 {
1504 .procname = "min_free_kbytes",
1505 .data = &min_free_kbytes,
1506 .maxlen = sizeof(min_free_kbytes),
1507 .mode = 0644,
1508 .proc_handler = min_free_kbytes_sysctl_handler,
1509 .extra1 = SYSCTL_ZERO,
1510 },
1511 {
1512 .procname = "watermark_boost_factor",
1513 .data = &watermark_boost_factor,
1514 .maxlen = sizeof(watermark_boost_factor),
1515 .mode = 0644,
1516 .proc_handler = watermark_boost_factor_sysctl_handler,
1517 .extra1 = SYSCTL_ZERO,
1518 },
1519 {
1520 .procname = "watermark_scale_factor",
1521 .data = &watermark_scale_factor,
1522 .maxlen = sizeof(watermark_scale_factor),
1523 .mode = 0644,
1524 .proc_handler = watermark_scale_factor_sysctl_handler,
1525 .extra1 = SYSCTL_ONE,
1526 .extra2 = &one_thousand,
1527 },
1528 {
1529 .procname = "extra_free_kbytes",
1530 .data = &extra_free_kbytes,
1531 .maxlen = sizeof(extra_free_kbytes),
1532 .mode = 0644,
1533 .proc_handler = min_free_kbytes_sysctl_handler,
1534 .extra1 = SYSCTL_ZERO,
1535 },
1536 {
1537 .procname = "percpu_pagelist_fraction",
1538 .data = &percpu_pagelist_fraction,
1539 .maxlen = sizeof(percpu_pagelist_fraction),
1540 .mode = 0644,
1541 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
1542 .extra1 = SYSCTL_ZERO,
1543 },
1544 #ifdef CONFIG_MMU
1545 {
1546 .procname = "max_map_count",
1547 .data = &sysctl_max_map_count,
1548 .maxlen = sizeof(sysctl_max_map_count),
1549 .mode = 0644,
1550 .proc_handler = proc_dointvec_minmax,
1551 .extra1 = SYSCTL_ZERO,
1552 },
1553 #else
1554 {
1555 .procname = "nr_trim_pages",
1556 .data = &sysctl_nr_trim_pages,
1557 .maxlen = sizeof(sysctl_nr_trim_pages),
1558 .mode = 0644,
1559 .proc_handler = proc_dointvec_minmax,
1560 .extra1 = SYSCTL_ZERO,
1561 },
1562 #endif
1563 {
1564 .procname = "laptop_mode",
1565 .data = &laptop_mode,
1566 .maxlen = sizeof(laptop_mode),
1567 .mode = 0644,
1568 .proc_handler = proc_dointvec_jiffies,
1569 },
1570 {
1571 .procname = "block_dump",
1572 .data = &block_dump,
1573 .maxlen = sizeof(block_dump),
1574 .mode = 0644,
1575 .proc_handler = proc_dointvec,
1576 .extra1 = SYSCTL_ZERO,
1577 },
1578 {
1579 .procname = "vfs_cache_pressure",
1580 .data = &sysctl_vfs_cache_pressure,
1581 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1582 .mode = 0644,
1583 .proc_handler = proc_dointvec,
1584 .extra1 = SYSCTL_ZERO,
1585 },
1586 #if defined(HAVE_ARCH_PICK_MMAP_LAYOUT) || \
1587 defined(CONFIG_ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT)
1588 {
1589 .procname = "legacy_va_layout",
1590 .data = &sysctl_legacy_va_layout,
1591 .maxlen = sizeof(sysctl_legacy_va_layout),
1592 .mode = 0644,
1593 .proc_handler = proc_dointvec,
1594 .extra1 = SYSCTL_ZERO,
1595 },
1596 #endif
1597 #ifdef CONFIG_NUMA
1598 {
1599 .procname = "zone_reclaim_mode",
1600 .data = &node_reclaim_mode,
1601 .maxlen = sizeof(node_reclaim_mode),
1602 .mode = 0644,
1603 .proc_handler = proc_dointvec,
1604 .extra1 = SYSCTL_ZERO,
1605 },
1606 {
1607 .procname = "min_unmapped_ratio",
1608 .data = &sysctl_min_unmapped_ratio,
1609 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1610 .mode = 0644,
1611 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
1612 .extra1 = SYSCTL_ZERO,
1613 .extra2 = &one_hundred,
1614 },
1615 {
1616 .procname = "min_slab_ratio",
1617 .data = &sysctl_min_slab_ratio,
1618 .maxlen = sizeof(sysctl_min_slab_ratio),
1619 .mode = 0644,
1620 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
1621 .extra1 = SYSCTL_ZERO,
1622 .extra2 = &one_hundred,
1623 },
1624 #endif
1625 #ifdef CONFIG_SMP
1626 {
1627 .procname = "stat_interval",
1628 .data = &sysctl_stat_interval,
1629 .maxlen = sizeof(sysctl_stat_interval),
1630 .mode = 0644,
1631 .proc_handler = proc_dointvec_jiffies,
1632 },
1633 {
1634 .procname = "stat_refresh",
1635 .data = NULL,
1636 .maxlen = 0,
1637 .mode = 0600,
1638 .proc_handler = vmstat_refresh,
1639 },
1640 #endif
1641 #ifdef CONFIG_MMU
1642 {
1643 .procname = "mmap_min_addr",
1644 .data = &dac_mmap_min_addr,
1645 .maxlen = sizeof(unsigned long),
1646 .mode = 0644,
1647 .proc_handler = mmap_min_addr_handler,
1648 },
1649 #endif
1650 #ifdef CONFIG_NUMA
1651 {
1652 .procname = "numa_zonelist_order",
1653 .data = &numa_zonelist_order,
1654 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1655 .mode = 0644,
1656 .proc_handler = numa_zonelist_order_handler,
1657 },
1658 #endif
1659 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1660 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1661 {
1662 .procname = "vdso_enabled",
1663 #ifdef CONFIG_X86_32
1664 .data = &vdso32_enabled,
1665 .maxlen = sizeof(vdso32_enabled),
1666 #else
1667 .data = &vdso_enabled,
1668 .maxlen = sizeof(vdso_enabled),
1669 #endif
1670 .mode = 0644,
1671 .proc_handler = proc_dointvec,
1672 .extra1 = SYSCTL_ZERO,
1673 },
1674 #endif
1675 #ifdef CONFIG_HIGHMEM
1676 {
1677 .procname = "highmem_is_dirtyable",
1678 .data = &vm_highmem_is_dirtyable,
1679 .maxlen = sizeof(vm_highmem_is_dirtyable),
1680 .mode = 0644,
1681 .proc_handler = proc_dointvec_minmax,
1682 .extra1 = SYSCTL_ZERO,
1683 .extra2 = SYSCTL_ONE,
1684 },
1685 #endif
1686 #ifdef CONFIG_MEMORY_FAILURE
1687 {
1688 .procname = "memory_failure_early_kill",
1689 .data = &sysctl_memory_failure_early_kill,
1690 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1691 .mode = 0644,
1692 .proc_handler = proc_dointvec_minmax,
1693 .extra1 = SYSCTL_ZERO,
1694 .extra2 = SYSCTL_ONE,
1695 },
1696 {
1697 .procname = "memory_failure_recovery",
1698 .data = &sysctl_memory_failure_recovery,
1699 .maxlen = sizeof(sysctl_memory_failure_recovery),
1700 .mode = 0644,
1701 .proc_handler = proc_dointvec_minmax,
1702 .extra1 = SYSCTL_ZERO,
1703 .extra2 = SYSCTL_ONE,
1704 },
1705 #endif
1706 {
1707 .procname = "user_reserve_kbytes",
1708 .data = &sysctl_user_reserve_kbytes,
1709 .maxlen = sizeof(sysctl_user_reserve_kbytes),
1710 .mode = 0644,
1711 .proc_handler = proc_doulongvec_minmax,
1712 },
1713 {
1714 .procname = "admin_reserve_kbytes",
1715 .data = &sysctl_admin_reserve_kbytes,
1716 .maxlen = sizeof(sysctl_admin_reserve_kbytes),
1717 .mode = 0644,
1718 .proc_handler = proc_doulongvec_minmax,
1719 },
1720 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS
1721 {
1722 .procname = "mmap_rnd_bits",
1723 .data = &mmap_rnd_bits,
1724 .maxlen = sizeof(mmap_rnd_bits),
1725 .mode = 0600,
1726 .proc_handler = proc_dointvec_minmax,
1727 .extra1 = (void *)&mmap_rnd_bits_min,
1728 .extra2 = (void *)&mmap_rnd_bits_max,
1729 },
1730 #endif
1731 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS
1732 {
1733 .procname = "mmap_rnd_compat_bits",
1734 .data = &mmap_rnd_compat_bits,
1735 .maxlen = sizeof(mmap_rnd_compat_bits),
1736 .mode = 0600,
1737 .proc_handler = proc_dointvec_minmax,
1738 .extra1 = (void *)&mmap_rnd_compat_bits_min,
1739 .extra2 = (void *)&mmap_rnd_compat_bits_max,
1740 },
1741 #endif
1742 #ifdef CONFIG_USERFAULTFD
1743 {
1744 .procname = "unprivileged_userfaultfd",
1745 .data = &sysctl_unprivileged_userfaultfd,
1746 .maxlen = sizeof(sysctl_unprivileged_userfaultfd),
1747 .mode = 0644,
1748 .proc_handler = proc_dointvec_minmax,
1749 .extra1 = SYSCTL_ZERO,
1750 .extra2 = SYSCTL_ONE,
1751 },
1752 #endif
1753 { }
1754 };
1755
1756 static struct ctl_table fs_table[] = {
1757 {
1758 .procname = "inode-nr",
1759 .data = &inodes_stat,
1760 .maxlen = 2*sizeof(long),
1761 .mode = 0444,
1762 .proc_handler = proc_nr_inodes,
1763 },
1764 {
1765 .procname = "inode-state",
1766 .data = &inodes_stat,
1767 .maxlen = 7*sizeof(long),
1768 .mode = 0444,
1769 .proc_handler = proc_nr_inodes,
1770 },
1771 {
1772 .procname = "file-nr",
1773 .data = &files_stat,
1774 .maxlen = sizeof(files_stat),
1775 .mode = 0444,
1776 .proc_handler = proc_nr_files,
1777 },
1778 {
1779 .procname = "file-max",
1780 .data = &files_stat.max_files,
1781 .maxlen = sizeof(files_stat.max_files),
1782 .mode = 0644,
1783 .proc_handler = proc_doulongvec_minmax,
1784 .extra1 = &zero_ul,
1785 .extra2 = &long_max,
1786 },
1787 {
1788 .procname = "nr_open",
1789 .data = &sysctl_nr_open,
1790 .maxlen = sizeof(unsigned int),
1791 .mode = 0644,
1792 .proc_handler = proc_dointvec_minmax,
1793 .extra1 = &sysctl_nr_open_min,
1794 .extra2 = &sysctl_nr_open_max,
1795 },
1796 {
1797 .procname = "dentry-state",
1798 .data = &dentry_stat,
1799 .maxlen = 6*sizeof(long),
1800 .mode = 0444,
1801 .proc_handler = proc_nr_dentry,
1802 },
1803 {
1804 .procname = "overflowuid",
1805 .data = &fs_overflowuid,
1806 .maxlen = sizeof(int),
1807 .mode = 0644,
1808 .proc_handler = proc_dointvec_minmax,
1809 .extra1 = &minolduid,
1810 .extra2 = &maxolduid,
1811 },
1812 {
1813 .procname = "overflowgid",
1814 .data = &fs_overflowgid,
1815 .maxlen = sizeof(int),
1816 .mode = 0644,
1817 .proc_handler = proc_dointvec_minmax,
1818 .extra1 = &minolduid,
1819 .extra2 = &maxolduid,
1820 },
1821 #ifdef CONFIG_FILE_LOCKING
1822 {
1823 .procname = "leases-enable",
1824 .data = &leases_enable,
1825 .maxlen = sizeof(int),
1826 .mode = 0644,
1827 .proc_handler = proc_dointvec,
1828 },
1829 #endif
1830 #ifdef CONFIG_DNOTIFY
1831 {
1832 .procname = "dir-notify-enable",
1833 .data = &dir_notify_enable,
1834 .maxlen = sizeof(int),
1835 .mode = 0644,
1836 .proc_handler = proc_dointvec,
1837 },
1838 #endif
1839 #ifdef CONFIG_MMU
1840 #ifdef CONFIG_FILE_LOCKING
1841 {
1842 .procname = "lease-break-time",
1843 .data = &lease_break_time,
1844 .maxlen = sizeof(int),
1845 .mode = 0644,
1846 .proc_handler = proc_dointvec,
1847 },
1848 #endif
1849 #ifdef CONFIG_AIO
1850 {
1851 .procname = "aio-nr",
1852 .data = &aio_nr,
1853 .maxlen = sizeof(aio_nr),
1854 .mode = 0444,
1855 .proc_handler = proc_doulongvec_minmax,
1856 },
1857 {
1858 .procname = "aio-max-nr",
1859 .data = &aio_max_nr,
1860 .maxlen = sizeof(aio_max_nr),
1861 .mode = 0644,
1862 .proc_handler = proc_doulongvec_minmax,
1863 },
1864 #endif /* CONFIG_AIO */
1865 #ifdef CONFIG_INOTIFY_USER
1866 {
1867 .procname = "inotify",
1868 .mode = 0555,
1869 .child = inotify_table,
1870 },
1871 #endif
1872 #ifdef CONFIG_EPOLL
1873 {
1874 .procname = "epoll",
1875 .mode = 0555,
1876 .child = epoll_table,
1877 },
1878 #endif
1879 #endif
1880 {
1881 .procname = "protected_symlinks",
1882 .data = &sysctl_protected_symlinks,
1883 .maxlen = sizeof(int),
1884 .mode = 0600,
1885 .proc_handler = proc_dointvec_minmax,
1886 .extra1 = SYSCTL_ZERO,
1887 .extra2 = SYSCTL_ONE,
1888 },
1889 {
1890 .procname = "protected_hardlinks",
1891 .data = &sysctl_protected_hardlinks,
1892 .maxlen = sizeof(int),
1893 .mode = 0600,
1894 .proc_handler = proc_dointvec_minmax,
1895 .extra1 = SYSCTL_ZERO,
1896 .extra2 = SYSCTL_ONE,
1897 },
1898 {
1899 .procname = "protected_fifos",
1900 .data = &sysctl_protected_fifos,
1901 .maxlen = sizeof(int),
1902 .mode = 0600,
1903 .proc_handler = proc_dointvec_minmax,
1904 .extra1 = SYSCTL_ZERO,
1905 .extra2 = &two,
1906 },
1907 {
1908 .procname = "protected_regular",
1909 .data = &sysctl_protected_regular,
1910 .maxlen = sizeof(int),
1911 .mode = 0600,
1912 .proc_handler = proc_dointvec_minmax,
1913 .extra1 = SYSCTL_ZERO,
1914 .extra2 = &two,
1915 },
1916 {
1917 .procname = "suid_dumpable",
1918 .data = &suid_dumpable,
1919 .maxlen = sizeof(int),
1920 .mode = 0644,
1921 .proc_handler = proc_dointvec_minmax_coredump,
1922 .extra1 = SYSCTL_ZERO,
1923 .extra2 = &two,
1924 },
1925 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1926 {
1927 .procname = "binfmt_misc",
1928 .mode = 0555,
1929 .child = sysctl_mount_point,
1930 },
1931 #endif
1932 {
1933 .procname = "pipe-max-size",
1934 .data = &pipe_max_size,
1935 .maxlen = sizeof(pipe_max_size),
1936 .mode = 0644,
1937 .proc_handler = proc_dopipe_max_size,
1938 },
1939 {
1940 .procname = "pipe-user-pages-hard",
1941 .data = &pipe_user_pages_hard,
1942 .maxlen = sizeof(pipe_user_pages_hard),
1943 .mode = 0644,
1944 .proc_handler = proc_doulongvec_minmax,
1945 },
1946 {
1947 .procname = "pipe-user-pages-soft",
1948 .data = &pipe_user_pages_soft,
1949 .maxlen = sizeof(pipe_user_pages_soft),
1950 .mode = 0644,
1951 .proc_handler = proc_doulongvec_minmax,
1952 },
1953 {
1954 .procname = "mount-max",
1955 .data = &sysctl_mount_max,
1956 .maxlen = sizeof(unsigned int),
1957 .mode = 0644,
1958 .proc_handler = proc_dointvec_minmax,
1959 .extra1 = SYSCTL_ONE,
1960 },
1961 { }
1962 };
1963
1964 static struct ctl_table debug_table[] = {
1965 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1966 {
1967 .procname = "exception-trace",
1968 .data = &show_unhandled_signals,
1969 .maxlen = sizeof(int),
1970 .mode = 0644,
1971 .proc_handler = proc_dointvec
1972 },
1973 #endif
1974 #if defined(CONFIG_OPTPROBES)
1975 {
1976 .procname = "kprobes-optimization",
1977 .data = &sysctl_kprobes_optimization,
1978 .maxlen = sizeof(int),
1979 .mode = 0644,
1980 .proc_handler = proc_kprobes_optimization_handler,
1981 .extra1 = SYSCTL_ZERO,
1982 .extra2 = SYSCTL_ONE,
1983 },
1984 #endif
1985 { }
1986 };
1987
1988 static struct ctl_table dev_table[] = {
1989 { }
1990 };
1991
sysctl_init(void)1992 int __init sysctl_init(void)
1993 {
1994 struct ctl_table_header *hdr;
1995
1996 hdr = register_sysctl_table(sysctl_base_table);
1997 kmemleak_not_leak(hdr);
1998 return 0;
1999 }
2000
2001 #endif /* CONFIG_SYSCTL */
2002
2003 /*
2004 * /proc/sys support
2005 */
2006
2007 #ifdef CONFIG_PROC_SYSCTL
2008
_proc_do_string(char * data,int maxlen,int write,char __user * buffer,size_t * lenp,loff_t * ppos)2009 static int _proc_do_string(char *data, int maxlen, int write,
2010 char __user *buffer,
2011 size_t *lenp, loff_t *ppos)
2012 {
2013 size_t len;
2014 char __user *p;
2015 char c;
2016
2017 if (!data || !maxlen || !*lenp) {
2018 *lenp = 0;
2019 return 0;
2020 }
2021
2022 if (write) {
2023 if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) {
2024 /* Only continue writes not past the end of buffer. */
2025 len = strlen(data);
2026 if (len > maxlen - 1)
2027 len = maxlen - 1;
2028
2029 if (*ppos > len)
2030 return 0;
2031 len = *ppos;
2032 } else {
2033 /* Start writing from beginning of buffer. */
2034 len = 0;
2035 }
2036
2037 *ppos += *lenp;
2038 p = buffer;
2039 while ((p - buffer) < *lenp && len < maxlen - 1) {
2040 if (get_user(c, p++))
2041 return -EFAULT;
2042 if (c == 0 || c == '\n')
2043 break;
2044 data[len++] = c;
2045 }
2046 data[len] = 0;
2047 } else {
2048 len = strlen(data);
2049 if (len > maxlen)
2050 len = maxlen;
2051
2052 if (*ppos > len) {
2053 *lenp = 0;
2054 return 0;
2055 }
2056
2057 data += *ppos;
2058 len -= *ppos;
2059
2060 if (len > *lenp)
2061 len = *lenp;
2062 if (len)
2063 if (copy_to_user(buffer, data, len))
2064 return -EFAULT;
2065 if (len < *lenp) {
2066 if (put_user('\n', buffer + len))
2067 return -EFAULT;
2068 len++;
2069 }
2070 *lenp = len;
2071 *ppos += len;
2072 }
2073 return 0;
2074 }
2075
warn_sysctl_write(struct ctl_table * table)2076 static void warn_sysctl_write(struct ctl_table *table)
2077 {
2078 pr_warn_once("%s wrote to %s when file position was not 0!\n"
2079 "This will not be supported in the future. To silence this\n"
2080 "warning, set kernel.sysctl_writes_strict = -1\n",
2081 current->comm, table->procname);
2082 }
2083
2084 /**
2085 * proc_first_pos_non_zero_ignore - check if first position is allowed
2086 * @ppos: file position
2087 * @table: the sysctl table
2088 *
2089 * Returns true if the first position is non-zero and the sysctl_writes_strict
2090 * mode indicates this is not allowed for numeric input types. String proc
2091 * handlers can ignore the return value.
2092 */
proc_first_pos_non_zero_ignore(loff_t * ppos,struct ctl_table * table)2093 static bool proc_first_pos_non_zero_ignore(loff_t *ppos,
2094 struct ctl_table *table)
2095 {
2096 if (!*ppos)
2097 return false;
2098
2099 switch (sysctl_writes_strict) {
2100 case SYSCTL_WRITES_STRICT:
2101 return true;
2102 case SYSCTL_WRITES_WARN:
2103 warn_sysctl_write(table);
2104 return false;
2105 default:
2106 return false;
2107 }
2108 }
2109
2110 /**
2111 * proc_dostring - read a string sysctl
2112 * @table: the sysctl table
2113 * @write: %TRUE if this is a write to the sysctl file
2114 * @buffer: the user buffer
2115 * @lenp: the size of the user buffer
2116 * @ppos: file position
2117 *
2118 * Reads/writes a string from/to the user buffer. If the kernel
2119 * buffer provided is not large enough to hold the string, the
2120 * string is truncated. The copied string is %NULL-terminated.
2121 * If the string is being read by the user process, it is copied
2122 * and a newline '\n' is added. It is truncated if the buffer is
2123 * not large enough.
2124 *
2125 * Returns 0 on success.
2126 */
proc_dostring(struct ctl_table * table,int write,void __user * buffer,size_t * lenp,loff_t * ppos)2127 int proc_dostring(struct ctl_table *table, int write,
2128 void __user *buffer, size_t *lenp, loff_t *ppos)
2129 {
2130 if (write)
2131 proc_first_pos_non_zero_ignore(ppos, table);
2132
2133 return _proc_do_string((char *)(table->data), table->maxlen, write,
2134 (char __user *)buffer, lenp, ppos);
2135 }
2136
proc_skip_spaces(char ** buf)2137 static size_t proc_skip_spaces(char **buf)
2138 {
2139 size_t ret;
2140 char *tmp = skip_spaces(*buf);
2141 ret = tmp - *buf;
2142 *buf = tmp;
2143 return ret;
2144 }
2145
proc_skip_char(char ** buf,size_t * size,const char v)2146 static void proc_skip_char(char **buf, size_t *size, const char v)
2147 {
2148 while (*size) {
2149 if (**buf != v)
2150 break;
2151 (*size)--;
2152 (*buf)++;
2153 }
2154 }
2155
2156 /**
2157 * strtoul_lenient - parse an ASCII formatted integer from a buffer and only
2158 * fail on overflow
2159 *
2160 * @cp: kernel buffer containing the string to parse
2161 * @endp: pointer to store the trailing characters
2162 * @base: the base to use
2163 * @res: where the parsed integer will be stored
2164 *
2165 * In case of success 0 is returned and @res will contain the parsed integer,
2166 * @endp will hold any trailing characters.
2167 * This function will fail the parse on overflow. If there wasn't an overflow
2168 * the function will defer the decision what characters count as invalid to the
2169 * caller.
2170 */
strtoul_lenient(const char * cp,char ** endp,unsigned int base,unsigned long * res)2171 static int strtoul_lenient(const char *cp, char **endp, unsigned int base,
2172 unsigned long *res)
2173 {
2174 unsigned long long result;
2175 unsigned int rv;
2176
2177 cp = _parse_integer_fixup_radix(cp, &base);
2178 rv = _parse_integer(cp, base, &result);
2179 if ((rv & KSTRTOX_OVERFLOW) || (result != (unsigned long)result))
2180 return -ERANGE;
2181
2182 cp += rv;
2183
2184 if (endp)
2185 *endp = (char *)cp;
2186
2187 *res = (unsigned long)result;
2188 return 0;
2189 }
2190
2191 #define TMPBUFLEN 22
2192 /**
2193 * proc_get_long - reads an ASCII formatted integer from a user buffer
2194 *
2195 * @buf: a kernel buffer
2196 * @size: size of the kernel buffer
2197 * @val: this is where the number will be stored
2198 * @neg: set to %TRUE if number is negative
2199 * @perm_tr: a vector which contains the allowed trailers
2200 * @perm_tr_len: size of the perm_tr vector
2201 * @tr: pointer to store the trailer character
2202 *
2203 * In case of success %0 is returned and @buf and @size are updated with
2204 * the amount of bytes read. If @tr is non-NULL and a trailing
2205 * character exists (size is non-zero after returning from this
2206 * function), @tr is updated with the trailing character.
2207 */
proc_get_long(char ** buf,size_t * size,unsigned long * val,bool * neg,const char * perm_tr,unsigned perm_tr_len,char * tr)2208 static int proc_get_long(char **buf, size_t *size,
2209 unsigned long *val, bool *neg,
2210 const char *perm_tr, unsigned perm_tr_len, char *tr)
2211 {
2212 int len;
2213 char *p, tmp[TMPBUFLEN];
2214
2215 if (!*size)
2216 return -EINVAL;
2217
2218 len = *size;
2219 if (len > TMPBUFLEN - 1)
2220 len = TMPBUFLEN - 1;
2221
2222 memcpy(tmp, *buf, len);
2223
2224 tmp[len] = 0;
2225 p = tmp;
2226 if (*p == '-' && *size > 1) {
2227 *neg = true;
2228 p++;
2229 } else
2230 *neg = false;
2231 if (!isdigit(*p))
2232 return -EINVAL;
2233
2234 if (strtoul_lenient(p, &p, 0, val))
2235 return -EINVAL;
2236
2237 len = p - tmp;
2238
2239 /* We don't know if the next char is whitespace thus we may accept
2240 * invalid integers (e.g. 1234...a) or two integers instead of one
2241 * (e.g. 123...1). So lets not allow such large numbers. */
2242 if (len == TMPBUFLEN - 1)
2243 return -EINVAL;
2244
2245 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
2246 return -EINVAL;
2247
2248 if (tr && (len < *size))
2249 *tr = *p;
2250
2251 *buf += len;
2252 *size -= len;
2253
2254 return 0;
2255 }
2256
2257 /**
2258 * proc_put_long - converts an integer to a decimal ASCII formatted string
2259 *
2260 * @buf: the user buffer
2261 * @size: the size of the user buffer
2262 * @val: the integer to be converted
2263 * @neg: sign of the number, %TRUE for negative
2264 *
2265 * In case of success %0 is returned and @buf and @size are updated with
2266 * the amount of bytes written.
2267 */
proc_put_long(void __user ** buf,size_t * size,unsigned long val,bool neg)2268 static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
2269 bool neg)
2270 {
2271 int len;
2272 char tmp[TMPBUFLEN], *p = tmp;
2273
2274 sprintf(p, "%s%lu", neg ? "-" : "", val);
2275 len = strlen(tmp);
2276 if (len > *size)
2277 len = *size;
2278 if (copy_to_user(*buf, tmp, len))
2279 return -EFAULT;
2280 *size -= len;
2281 *buf += len;
2282 return 0;
2283 }
2284 #undef TMPBUFLEN
2285
proc_put_char(void __user ** buf,size_t * size,char c)2286 static int proc_put_char(void __user **buf, size_t *size, char c)
2287 {
2288 if (*size) {
2289 char __user **buffer = (char __user **)buf;
2290 if (put_user(c, *buffer))
2291 return -EFAULT;
2292 (*size)--, (*buffer)++;
2293 *buf = *buffer;
2294 }
2295 return 0;
2296 }
2297
do_proc_dointvec_conv(bool * negp,unsigned long * lvalp,int * valp,int write,void * data)2298 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
2299 int *valp,
2300 int write, void *data)
2301 {
2302 if (write) {
2303 if (*negp) {
2304 if (*lvalp > (unsigned long) INT_MAX + 1)
2305 return -EINVAL;
2306 *valp = -*lvalp;
2307 } else {
2308 if (*lvalp > (unsigned long) INT_MAX)
2309 return -EINVAL;
2310 *valp = *lvalp;
2311 }
2312 } else {
2313 int val = *valp;
2314 if (val < 0) {
2315 *negp = true;
2316 *lvalp = -(unsigned long)val;
2317 } else {
2318 *negp = false;
2319 *lvalp = (unsigned long)val;
2320 }
2321 }
2322 return 0;
2323 }
2324
do_proc_douintvec_conv(unsigned long * lvalp,unsigned int * valp,int write,void * data)2325 static int do_proc_douintvec_conv(unsigned long *lvalp,
2326 unsigned int *valp,
2327 int write, void *data)
2328 {
2329 if (write) {
2330 if (*lvalp > UINT_MAX)
2331 return -EINVAL;
2332 *valp = *lvalp;
2333 } else {
2334 unsigned int val = *valp;
2335 *lvalp = (unsigned long)val;
2336 }
2337 return 0;
2338 }
2339
2340 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
2341
__do_proc_dointvec(void * tbl_data,struct ctl_table * table,int write,void __user * buffer,size_t * lenp,loff_t * ppos,int (* conv)(bool * negp,unsigned long * lvalp,int * valp,int write,void * data),void * data)2342 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
2343 int write, void __user *buffer,
2344 size_t *lenp, loff_t *ppos,
2345 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2346 int write, void *data),
2347 void *data)
2348 {
2349 int *i, vleft, first = 1, err = 0;
2350 size_t left;
2351 char *kbuf = NULL, *p;
2352
2353 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
2354 *lenp = 0;
2355 return 0;
2356 }
2357
2358 i = (int *) tbl_data;
2359 vleft = table->maxlen / sizeof(*i);
2360 left = *lenp;
2361
2362 if (!conv)
2363 conv = do_proc_dointvec_conv;
2364
2365 if (write) {
2366 if (proc_first_pos_non_zero_ignore(ppos, table))
2367 goto out;
2368
2369 if (left > PAGE_SIZE - 1)
2370 left = PAGE_SIZE - 1;
2371 p = kbuf = memdup_user_nul(buffer, left);
2372 if (IS_ERR(kbuf))
2373 return PTR_ERR(kbuf);
2374 }
2375
2376 for (; left && vleft--; i++, first=0) {
2377 unsigned long lval;
2378 bool neg;
2379
2380 if (write) {
2381 left -= proc_skip_spaces(&p);
2382
2383 if (!left)
2384 break;
2385 err = proc_get_long(&p, &left, &lval, &neg,
2386 proc_wspace_sep,
2387 sizeof(proc_wspace_sep), NULL);
2388 if (err)
2389 break;
2390 if (conv(&neg, &lval, i, 1, data)) {
2391 err = -EINVAL;
2392 break;
2393 }
2394 } else {
2395 if (conv(&neg, &lval, i, 0, data)) {
2396 err = -EINVAL;
2397 break;
2398 }
2399 if (!first)
2400 err = proc_put_char(&buffer, &left, '\t');
2401 if (err)
2402 break;
2403 err = proc_put_long(&buffer, &left, lval, neg);
2404 if (err)
2405 break;
2406 }
2407 }
2408
2409 if (!write && !first && left && !err)
2410 err = proc_put_char(&buffer, &left, '\n');
2411 if (write && !err && left)
2412 left -= proc_skip_spaces(&p);
2413 if (write) {
2414 kfree(kbuf);
2415 if (first)
2416 return err ? : -EINVAL;
2417 }
2418 *lenp -= left;
2419 out:
2420 *ppos += *lenp;
2421 return err;
2422 }
2423
do_proc_dointvec(struct ctl_table * table,int write,void __user * buffer,size_t * lenp,loff_t * ppos,int (* conv)(bool * negp,unsigned long * lvalp,int * valp,int write,void * data),void * data)2424 static int do_proc_dointvec(struct ctl_table *table, int write,
2425 void __user *buffer, size_t *lenp, loff_t *ppos,
2426 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2427 int write, void *data),
2428 void *data)
2429 {
2430 return __do_proc_dointvec(table->data, table, write,
2431 buffer, lenp, ppos, conv, data);
2432 }
2433
do_proc_douintvec_w(unsigned int * tbl_data,struct ctl_table * table,void __user * buffer,size_t * lenp,loff_t * ppos,int (* conv)(unsigned long * lvalp,unsigned int * valp,int write,void * data),void * data)2434 static int do_proc_douintvec_w(unsigned int *tbl_data,
2435 struct ctl_table *table,
2436 void __user *buffer,
2437 size_t *lenp, loff_t *ppos,
2438 int (*conv)(unsigned long *lvalp,
2439 unsigned int *valp,
2440 int write, void *data),
2441 void *data)
2442 {
2443 unsigned long lval;
2444 int err = 0;
2445 size_t left;
2446 bool neg;
2447 char *kbuf = NULL, *p;
2448
2449 left = *lenp;
2450
2451 if (proc_first_pos_non_zero_ignore(ppos, table))
2452 goto bail_early;
2453
2454 if (left > PAGE_SIZE - 1)
2455 left = PAGE_SIZE - 1;
2456
2457 p = kbuf = memdup_user_nul(buffer, left);
2458 if (IS_ERR(kbuf))
2459 return -EINVAL;
2460
2461 left -= proc_skip_spaces(&p);
2462 if (!left) {
2463 err = -EINVAL;
2464 goto out_free;
2465 }
2466
2467 err = proc_get_long(&p, &left, &lval, &neg,
2468 proc_wspace_sep,
2469 sizeof(proc_wspace_sep), NULL);
2470 if (err || neg) {
2471 err = -EINVAL;
2472 goto out_free;
2473 }
2474
2475 if (conv(&lval, tbl_data, 1, data)) {
2476 err = -EINVAL;
2477 goto out_free;
2478 }
2479
2480 if (!err && left)
2481 left -= proc_skip_spaces(&p);
2482
2483 out_free:
2484 kfree(kbuf);
2485 if (err)
2486 return -EINVAL;
2487
2488 return 0;
2489
2490 /* This is in keeping with old __do_proc_dointvec() */
2491 bail_early:
2492 *ppos += *lenp;
2493 return err;
2494 }
2495
do_proc_douintvec_r(unsigned int * tbl_data,void __user * buffer,size_t * lenp,loff_t * ppos,int (* conv)(unsigned long * lvalp,unsigned int * valp,int write,void * data),void * data)2496 static int do_proc_douintvec_r(unsigned int *tbl_data, void __user *buffer,
2497 size_t *lenp, loff_t *ppos,
2498 int (*conv)(unsigned long *lvalp,
2499 unsigned int *valp,
2500 int write, void *data),
2501 void *data)
2502 {
2503 unsigned long lval;
2504 int err = 0;
2505 size_t left;
2506
2507 left = *lenp;
2508
2509 if (conv(&lval, tbl_data, 0, data)) {
2510 err = -EINVAL;
2511 goto out;
2512 }
2513
2514 err = proc_put_long(&buffer, &left, lval, false);
2515 if (err || !left)
2516 goto out;
2517
2518 err = proc_put_char(&buffer, &left, '\n');
2519
2520 out:
2521 *lenp -= left;
2522 *ppos += *lenp;
2523
2524 return err;
2525 }
2526
__do_proc_douintvec(void * tbl_data,struct ctl_table * table,int write,void __user * buffer,size_t * lenp,loff_t * ppos,int (* conv)(unsigned long * lvalp,unsigned int * valp,int write,void * data),void * data)2527 static int __do_proc_douintvec(void *tbl_data, struct ctl_table *table,
2528 int write, void __user *buffer,
2529 size_t *lenp, loff_t *ppos,
2530 int (*conv)(unsigned long *lvalp,
2531 unsigned int *valp,
2532 int write, void *data),
2533 void *data)
2534 {
2535 unsigned int *i, vleft;
2536
2537 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
2538 *lenp = 0;
2539 return 0;
2540 }
2541
2542 i = (unsigned int *) tbl_data;
2543 vleft = table->maxlen / sizeof(*i);
2544
2545 /*
2546 * Arrays are not supported, keep this simple. *Do not* add
2547 * support for them.
2548 */
2549 if (vleft != 1) {
2550 *lenp = 0;
2551 return -EINVAL;
2552 }
2553
2554 if (!conv)
2555 conv = do_proc_douintvec_conv;
2556
2557 if (write)
2558 return do_proc_douintvec_w(i, table, buffer, lenp, ppos,
2559 conv, data);
2560 return do_proc_douintvec_r(i, buffer, lenp, ppos, conv, data);
2561 }
2562
do_proc_douintvec(struct ctl_table * table,int write,void __user * buffer,size_t * lenp,loff_t * ppos,int (* conv)(unsigned long * lvalp,unsigned int * valp,int write,void * data),void * data)2563 static int do_proc_douintvec(struct ctl_table *table, int write,
2564 void __user *buffer, size_t *lenp, loff_t *ppos,
2565 int (*conv)(unsigned long *lvalp,
2566 unsigned int *valp,
2567 int write, void *data),
2568 void *data)
2569 {
2570 return __do_proc_douintvec(table->data, table, write,
2571 buffer, lenp, ppos, conv, data);
2572 }
2573
2574 /**
2575 * proc_dointvec - read a vector of integers
2576 * @table: the sysctl table
2577 * @write: %TRUE if this is a write to the sysctl file
2578 * @buffer: the user buffer
2579 * @lenp: the size of the user buffer
2580 * @ppos: file position
2581 *
2582 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2583 * values from/to the user buffer, treated as an ASCII string.
2584 *
2585 * Returns 0 on success.
2586 */
proc_dointvec(struct ctl_table * table,int write,void __user * buffer,size_t * lenp,loff_t * ppos)2587 int proc_dointvec(struct ctl_table *table, int write,
2588 void __user *buffer, size_t *lenp, loff_t *ppos)
2589 {
2590 return do_proc_dointvec(table, write, buffer, lenp, ppos, NULL, NULL);
2591 }
2592
2593 /**
2594 * proc_douintvec - read a vector of unsigned integers
2595 * @table: the sysctl table
2596 * @write: %TRUE if this is a write to the sysctl file
2597 * @buffer: the user buffer
2598 * @lenp: the size of the user buffer
2599 * @ppos: file position
2600 *
2601 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
2602 * values from/to the user buffer, treated as an ASCII string.
2603 *
2604 * Returns 0 on success.
2605 */
proc_douintvec(struct ctl_table * table,int write,void __user * buffer,size_t * lenp,loff_t * ppos)2606 int proc_douintvec(struct ctl_table *table, int write,
2607 void __user *buffer, size_t *lenp, loff_t *ppos)
2608 {
2609 return do_proc_douintvec(table, write, buffer, lenp, ppos,
2610 do_proc_douintvec_conv, NULL);
2611 }
2612
2613 /*
2614 * Taint values can only be increased
2615 * This means we can safely use a temporary.
2616 */
proc_taint(struct ctl_table * table,int write,void __user * buffer,size_t * lenp,loff_t * ppos)2617 static int proc_taint(struct ctl_table *table, int write,
2618 void __user *buffer, size_t *lenp, loff_t *ppos)
2619 {
2620 struct ctl_table t;
2621 unsigned long tmptaint = get_taint();
2622 int err;
2623
2624 if (write && !capable(CAP_SYS_ADMIN))
2625 return -EPERM;
2626
2627 t = *table;
2628 t.data = &tmptaint;
2629 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2630 if (err < 0)
2631 return err;
2632
2633 if (write) {
2634 /*
2635 * Poor man's atomic or. Not worth adding a primitive
2636 * to everyone's atomic.h for this
2637 */
2638 int i;
2639 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2640 if ((tmptaint >> i) & 1)
2641 add_taint(i, LOCKDEP_STILL_OK);
2642 }
2643 }
2644
2645 return err;
2646 }
2647
2648 #ifdef CONFIG_PRINTK
proc_dointvec_minmax_sysadmin(struct ctl_table * table,int write,void __user * buffer,size_t * lenp,loff_t * ppos)2649 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
2650 void __user *buffer, size_t *lenp, loff_t *ppos)
2651 {
2652 if (write && !capable(CAP_SYS_ADMIN))
2653 return -EPERM;
2654
2655 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2656 }
2657 #endif
2658
2659 /**
2660 * struct do_proc_dointvec_minmax_conv_param - proc_dointvec_minmax() range checking structure
2661 * @min: pointer to minimum allowable value
2662 * @max: pointer to maximum allowable value
2663 *
2664 * The do_proc_dointvec_minmax_conv_param structure provides the
2665 * minimum and maximum values for doing range checking for those sysctl
2666 * parameters that use the proc_dointvec_minmax() handler.
2667 */
2668 struct do_proc_dointvec_minmax_conv_param {
2669 int *min;
2670 int *max;
2671 };
2672
do_proc_dointvec_minmax_conv(bool * negp,unsigned long * lvalp,int * valp,int write,void * data)2673 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2674 int *valp,
2675 int write, void *data)
2676 {
2677 int tmp, ret;
2678 struct do_proc_dointvec_minmax_conv_param *param = data;
2679 /*
2680 * If writing, first do so via a temporary local int so we can
2681 * bounds-check it before touching *valp.
2682 */
2683 int *ip = write ? &tmp : valp;
2684
2685 ret = do_proc_dointvec_conv(negp, lvalp, ip, write, data);
2686 if (ret)
2687 return ret;
2688
2689 if (write) {
2690 if ((param->min && *param->min > tmp) ||
2691 (param->max && *param->max < tmp))
2692 return -EINVAL;
2693 *valp = tmp;
2694 }
2695
2696 return 0;
2697 }
2698
2699 /**
2700 * proc_dointvec_minmax - read a vector of integers with min/max values
2701 * @table: the sysctl table
2702 * @write: %TRUE if this is a write to the sysctl file
2703 * @buffer: the user buffer
2704 * @lenp: the size of the user buffer
2705 * @ppos: file position
2706 *
2707 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2708 * values from/to the user buffer, treated as an ASCII string.
2709 *
2710 * This routine will ensure the values are within the range specified by
2711 * table->extra1 (min) and table->extra2 (max).
2712 *
2713 * Returns 0 on success or -EINVAL on write when the range check fails.
2714 */
proc_dointvec_minmax(struct ctl_table * table,int write,void __user * buffer,size_t * lenp,loff_t * ppos)2715 int proc_dointvec_minmax(struct ctl_table *table, int write,
2716 void __user *buffer, size_t *lenp, loff_t *ppos)
2717 {
2718 struct do_proc_dointvec_minmax_conv_param param = {
2719 .min = (int *) table->extra1,
2720 .max = (int *) table->extra2,
2721 };
2722 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2723 do_proc_dointvec_minmax_conv, ¶m);
2724 }
2725
2726 /**
2727 * struct do_proc_douintvec_minmax_conv_param - proc_douintvec_minmax() range checking structure
2728 * @min: pointer to minimum allowable value
2729 * @max: pointer to maximum allowable value
2730 *
2731 * The do_proc_douintvec_minmax_conv_param structure provides the
2732 * minimum and maximum values for doing range checking for those sysctl
2733 * parameters that use the proc_douintvec_minmax() handler.
2734 */
2735 struct do_proc_douintvec_minmax_conv_param {
2736 unsigned int *min;
2737 unsigned int *max;
2738 };
2739
do_proc_douintvec_minmax_conv(unsigned long * lvalp,unsigned int * valp,int write,void * data)2740 static int do_proc_douintvec_minmax_conv(unsigned long *lvalp,
2741 unsigned int *valp,
2742 int write, void *data)
2743 {
2744 int ret;
2745 unsigned int tmp;
2746 struct do_proc_douintvec_minmax_conv_param *param = data;
2747 /* write via temporary local uint for bounds-checking */
2748 unsigned int *up = write ? &tmp : valp;
2749
2750 ret = do_proc_douintvec_conv(lvalp, up, write, data);
2751 if (ret)
2752 return ret;
2753
2754 if (write) {
2755 if ((param->min && *param->min > tmp) ||
2756 (param->max && *param->max < tmp))
2757 return -ERANGE;
2758
2759 *valp = tmp;
2760 }
2761
2762 return 0;
2763 }
2764
2765 /**
2766 * proc_douintvec_minmax - read a vector of unsigned ints with min/max values
2767 * @table: the sysctl table
2768 * @write: %TRUE if this is a write to the sysctl file
2769 * @buffer: the user buffer
2770 * @lenp: the size of the user buffer
2771 * @ppos: file position
2772 *
2773 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
2774 * values from/to the user buffer, treated as an ASCII string. Negative
2775 * strings are not allowed.
2776 *
2777 * This routine will ensure the values are within the range specified by
2778 * table->extra1 (min) and table->extra2 (max). There is a final sanity
2779 * check for UINT_MAX to avoid having to support wrap around uses from
2780 * userspace.
2781 *
2782 * Returns 0 on success or -ERANGE on write when the range check fails.
2783 */
proc_douintvec_minmax(struct ctl_table * table,int write,void __user * buffer,size_t * lenp,loff_t * ppos)2784 int proc_douintvec_minmax(struct ctl_table *table, int write,
2785 void __user *buffer, size_t *lenp, loff_t *ppos)
2786 {
2787 struct do_proc_douintvec_minmax_conv_param param = {
2788 .min = (unsigned int *) table->extra1,
2789 .max = (unsigned int *) table->extra2,
2790 };
2791 return do_proc_douintvec(table, write, buffer, lenp, ppos,
2792 do_proc_douintvec_minmax_conv, ¶m);
2793 }
2794
do_proc_dopipe_max_size_conv(unsigned long * lvalp,unsigned int * valp,int write,void * data)2795 static int do_proc_dopipe_max_size_conv(unsigned long *lvalp,
2796 unsigned int *valp,
2797 int write, void *data)
2798 {
2799 if (write) {
2800 unsigned int val;
2801
2802 val = round_pipe_size(*lvalp);
2803 if (val == 0)
2804 return -EINVAL;
2805
2806 *valp = val;
2807 } else {
2808 unsigned int val = *valp;
2809 *lvalp = (unsigned long) val;
2810 }
2811
2812 return 0;
2813 }
2814
proc_dopipe_max_size(struct ctl_table * table,int write,void __user * buffer,size_t * lenp,loff_t * ppos)2815 static int proc_dopipe_max_size(struct ctl_table *table, int write,
2816 void __user *buffer, size_t *lenp, loff_t *ppos)
2817 {
2818 return do_proc_douintvec(table, write, buffer, lenp, ppos,
2819 do_proc_dopipe_max_size_conv, NULL);
2820 }
2821
validate_coredump_safety(void)2822 static void validate_coredump_safety(void)
2823 {
2824 #ifdef CONFIG_COREDUMP
2825 if (suid_dumpable == SUID_DUMP_ROOT &&
2826 core_pattern[0] != '/' && core_pattern[0] != '|') {
2827 printk(KERN_WARNING
2828 "Unsafe core_pattern used with fs.suid_dumpable=2.\n"
2829 "Pipe handler or fully qualified core dump path required.\n"
2830 "Set kernel.core_pattern before fs.suid_dumpable.\n"
2831 );
2832 }
2833 #endif
2834 }
2835
proc_dointvec_minmax_coredump(struct ctl_table * table,int write,void __user * buffer,size_t * lenp,loff_t * ppos)2836 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2837 void __user *buffer, size_t *lenp, loff_t *ppos)
2838 {
2839 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2840 if (!error)
2841 validate_coredump_safety();
2842 return error;
2843 }
2844
2845 #ifdef CONFIG_COREDUMP
proc_dostring_coredump(struct ctl_table * table,int write,void __user * buffer,size_t * lenp,loff_t * ppos)2846 static int proc_dostring_coredump(struct ctl_table *table, int write,
2847 void __user *buffer, size_t *lenp, loff_t *ppos)
2848 {
2849 int error = proc_dostring(table, write, buffer, lenp, ppos);
2850 if (!error)
2851 validate_coredump_safety();
2852 return error;
2853 }
2854 #endif
2855
__do_proc_doulongvec_minmax(void * data,struct ctl_table * table,int write,void __user * buffer,size_t * lenp,loff_t * ppos,unsigned long convmul,unsigned long convdiv)2856 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2857 void __user *buffer,
2858 size_t *lenp, loff_t *ppos,
2859 unsigned long convmul,
2860 unsigned long convdiv)
2861 {
2862 unsigned long *i, *min, *max;
2863 int vleft, first = 1, err = 0;
2864 size_t left;
2865 char *kbuf = NULL, *p;
2866
2867 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2868 *lenp = 0;
2869 return 0;
2870 }
2871
2872 i = (unsigned long *) data;
2873 min = (unsigned long *) table->extra1;
2874 max = (unsigned long *) table->extra2;
2875 vleft = table->maxlen / sizeof(unsigned long);
2876 left = *lenp;
2877
2878 if (write) {
2879 if (proc_first_pos_non_zero_ignore(ppos, table))
2880 goto out;
2881
2882 if (left > PAGE_SIZE - 1)
2883 left = PAGE_SIZE - 1;
2884 p = kbuf = memdup_user_nul(buffer, left);
2885 if (IS_ERR(kbuf))
2886 return PTR_ERR(kbuf);
2887 }
2888
2889 for (; left && vleft--; i++, first = 0) {
2890 unsigned long val;
2891
2892 if (write) {
2893 bool neg;
2894
2895 left -= proc_skip_spaces(&p);
2896 if (!left)
2897 break;
2898
2899 err = proc_get_long(&p, &left, &val, &neg,
2900 proc_wspace_sep,
2901 sizeof(proc_wspace_sep), NULL);
2902 if (err)
2903 break;
2904 if (neg)
2905 continue;
2906 val = convmul * val / convdiv;
2907 if ((min && val < *min) || (max && val > *max)) {
2908 err = -EINVAL;
2909 break;
2910 }
2911 *i = val;
2912 } else {
2913 val = convdiv * (*i) / convmul;
2914 if (!first) {
2915 err = proc_put_char(&buffer, &left, '\t');
2916 if (err)
2917 break;
2918 }
2919 err = proc_put_long(&buffer, &left, val, false);
2920 if (err)
2921 break;
2922 }
2923 }
2924
2925 if (!write && !first && left && !err)
2926 err = proc_put_char(&buffer, &left, '\n');
2927 if (write && !err)
2928 left -= proc_skip_spaces(&p);
2929 if (write) {
2930 kfree(kbuf);
2931 if (first)
2932 return err ? : -EINVAL;
2933 }
2934 *lenp -= left;
2935 out:
2936 *ppos += *lenp;
2937 return err;
2938 }
2939
do_proc_doulongvec_minmax(struct ctl_table * table,int write,void __user * buffer,size_t * lenp,loff_t * ppos,unsigned long convmul,unsigned long convdiv)2940 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2941 void __user *buffer,
2942 size_t *lenp, loff_t *ppos,
2943 unsigned long convmul,
2944 unsigned long convdiv)
2945 {
2946 return __do_proc_doulongvec_minmax(table->data, table, write,
2947 buffer, lenp, ppos, convmul, convdiv);
2948 }
2949
2950 /**
2951 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2952 * @table: the sysctl table
2953 * @write: %TRUE if this is a write to the sysctl file
2954 * @buffer: the user buffer
2955 * @lenp: the size of the user buffer
2956 * @ppos: file position
2957 *
2958 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2959 * values from/to the user buffer, treated as an ASCII string.
2960 *
2961 * This routine will ensure the values are within the range specified by
2962 * table->extra1 (min) and table->extra2 (max).
2963 *
2964 * Returns 0 on success.
2965 */
proc_doulongvec_minmax(struct ctl_table * table,int write,void __user * buffer,size_t * lenp,loff_t * ppos)2966 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2967 void __user *buffer, size_t *lenp, loff_t *ppos)
2968 {
2969 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2970 }
2971
2972 /**
2973 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2974 * @table: the sysctl table
2975 * @write: %TRUE if this is a write to the sysctl file
2976 * @buffer: the user buffer
2977 * @lenp: the size of the user buffer
2978 * @ppos: file position
2979 *
2980 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2981 * values from/to the user buffer, treated as an ASCII string. The values
2982 * are treated as milliseconds, and converted to jiffies when they are stored.
2983 *
2984 * This routine will ensure the values are within the range specified by
2985 * table->extra1 (min) and table->extra2 (max).
2986 *
2987 * Returns 0 on success.
2988 */
proc_doulongvec_ms_jiffies_minmax(struct ctl_table * table,int write,void __user * buffer,size_t * lenp,loff_t * ppos)2989 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2990 void __user *buffer,
2991 size_t *lenp, loff_t *ppos)
2992 {
2993 return do_proc_doulongvec_minmax(table, write, buffer,
2994 lenp, ppos, HZ, 1000l);
2995 }
2996
2997
do_proc_dointvec_jiffies_conv(bool * negp,unsigned long * lvalp,int * valp,int write,void * data)2998 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2999 int *valp,
3000 int write, void *data)
3001 {
3002 if (write) {
3003 if (*lvalp > INT_MAX / HZ)
3004 return 1;
3005 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
3006 } else {
3007 int val = *valp;
3008 unsigned long lval;
3009 if (val < 0) {
3010 *negp = true;
3011 lval = -(unsigned long)val;
3012 } else {
3013 *negp = false;
3014 lval = (unsigned long)val;
3015 }
3016 *lvalp = lval / HZ;
3017 }
3018 return 0;
3019 }
3020
do_proc_dointvec_userhz_jiffies_conv(bool * negp,unsigned long * lvalp,int * valp,int write,void * data)3021 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
3022 int *valp,
3023 int write, void *data)
3024 {
3025 if (write) {
3026 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
3027 return 1;
3028 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
3029 } else {
3030 int val = *valp;
3031 unsigned long lval;
3032 if (val < 0) {
3033 *negp = true;
3034 lval = -(unsigned long)val;
3035 } else {
3036 *negp = false;
3037 lval = (unsigned long)val;
3038 }
3039 *lvalp = jiffies_to_clock_t(lval);
3040 }
3041 return 0;
3042 }
3043
do_proc_dointvec_ms_jiffies_conv(bool * negp,unsigned long * lvalp,int * valp,int write,void * data)3044 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
3045 int *valp,
3046 int write, void *data)
3047 {
3048 if (write) {
3049 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
3050
3051 if (jif > INT_MAX)
3052 return 1;
3053 *valp = (int)jif;
3054 } else {
3055 int val = *valp;
3056 unsigned long lval;
3057 if (val < 0) {
3058 *negp = true;
3059 lval = -(unsigned long)val;
3060 } else {
3061 *negp = false;
3062 lval = (unsigned long)val;
3063 }
3064 *lvalp = jiffies_to_msecs(lval);
3065 }
3066 return 0;
3067 }
3068
3069 /**
3070 * proc_dointvec_jiffies - read a vector of integers as seconds
3071 * @table: the sysctl table
3072 * @write: %TRUE if this is a write to the sysctl file
3073 * @buffer: the user buffer
3074 * @lenp: the size of the user buffer
3075 * @ppos: file position
3076 *
3077 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
3078 * values from/to the user buffer, treated as an ASCII string.
3079 * The values read are assumed to be in seconds, and are converted into
3080 * jiffies.
3081 *
3082 * Returns 0 on success.
3083 */
proc_dointvec_jiffies(struct ctl_table * table,int write,void __user * buffer,size_t * lenp,loff_t * ppos)3084 int proc_dointvec_jiffies(struct ctl_table *table, int write,
3085 void __user *buffer, size_t *lenp, loff_t *ppos)
3086 {
3087 return do_proc_dointvec(table,write,buffer,lenp,ppos,
3088 do_proc_dointvec_jiffies_conv,NULL);
3089 }
3090
3091 /**
3092 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
3093 * @table: the sysctl table
3094 * @write: %TRUE if this is a write to the sysctl file
3095 * @buffer: the user buffer
3096 * @lenp: the size of the user buffer
3097 * @ppos: pointer to the file position
3098 *
3099 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
3100 * values from/to the user buffer, treated as an ASCII string.
3101 * The values read are assumed to be in 1/USER_HZ seconds, and
3102 * are converted into jiffies.
3103 *
3104 * Returns 0 on success.
3105 */
proc_dointvec_userhz_jiffies(struct ctl_table * table,int write,void __user * buffer,size_t * lenp,loff_t * ppos)3106 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
3107 void __user *buffer, size_t *lenp, loff_t *ppos)
3108 {
3109 return do_proc_dointvec(table,write,buffer,lenp,ppos,
3110 do_proc_dointvec_userhz_jiffies_conv,NULL);
3111 }
3112
3113 /**
3114 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
3115 * @table: the sysctl table
3116 * @write: %TRUE if this is a write to the sysctl file
3117 * @buffer: the user buffer
3118 * @lenp: the size of the user buffer
3119 * @ppos: file position
3120 * @ppos: the current position in the file
3121 *
3122 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
3123 * values from/to the user buffer, treated as an ASCII string.
3124 * The values read are assumed to be in 1/1000 seconds, and
3125 * are converted into jiffies.
3126 *
3127 * Returns 0 on success.
3128 */
proc_dointvec_ms_jiffies(struct ctl_table * table,int write,void __user * buffer,size_t * lenp,loff_t * ppos)3129 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
3130 void __user *buffer, size_t *lenp, loff_t *ppos)
3131 {
3132 return do_proc_dointvec(table, write, buffer, lenp, ppos,
3133 do_proc_dointvec_ms_jiffies_conv, NULL);
3134 }
3135
proc_do_cad_pid(struct ctl_table * table,int write,void __user * buffer,size_t * lenp,loff_t * ppos)3136 static int proc_do_cad_pid(struct ctl_table *table, int write,
3137 void __user *buffer, size_t *lenp, loff_t *ppos)
3138 {
3139 struct pid *new_pid;
3140 pid_t tmp;
3141 int r;
3142
3143 tmp = pid_vnr(cad_pid);
3144
3145 r = __do_proc_dointvec(&tmp, table, write, buffer,
3146 lenp, ppos, NULL, NULL);
3147 if (r || !write)
3148 return r;
3149
3150 new_pid = find_get_pid(tmp);
3151 if (!new_pid)
3152 return -ESRCH;
3153
3154 put_pid(xchg(&cad_pid, new_pid));
3155 return 0;
3156 }
3157
3158 /**
3159 * proc_do_large_bitmap - read/write from/to a large bitmap
3160 * @table: the sysctl table
3161 * @write: %TRUE if this is a write to the sysctl file
3162 * @buffer: the user buffer
3163 * @lenp: the size of the user buffer
3164 * @ppos: file position
3165 *
3166 * The bitmap is stored at table->data and the bitmap length (in bits)
3167 * in table->maxlen.
3168 *
3169 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
3170 * large bitmaps may be represented in a compact manner. Writing into
3171 * the file will clear the bitmap then update it with the given input.
3172 *
3173 * Returns 0 on success.
3174 */
proc_do_large_bitmap(struct ctl_table * table,int write,void __user * buffer,size_t * lenp,loff_t * ppos)3175 int proc_do_large_bitmap(struct ctl_table *table, int write,
3176 void __user *buffer, size_t *lenp, loff_t *ppos)
3177 {
3178 int err = 0;
3179 bool first = 1;
3180 size_t left = *lenp;
3181 unsigned long bitmap_len = table->maxlen;
3182 unsigned long *bitmap = *(unsigned long **) table->data;
3183 unsigned long *tmp_bitmap = NULL;
3184 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
3185
3186 if (!bitmap || !bitmap_len || !left || (*ppos && !write)) {
3187 *lenp = 0;
3188 return 0;
3189 }
3190
3191 if (write) {
3192 char *kbuf, *p;
3193 size_t skipped = 0;
3194
3195 if (left > PAGE_SIZE - 1) {
3196 left = PAGE_SIZE - 1;
3197 /* How much of the buffer we'll skip this pass */
3198 skipped = *lenp - left;
3199 }
3200
3201 p = kbuf = memdup_user_nul(buffer, left);
3202 if (IS_ERR(kbuf))
3203 return PTR_ERR(kbuf);
3204
3205 tmp_bitmap = bitmap_zalloc(bitmap_len, GFP_KERNEL);
3206 if (!tmp_bitmap) {
3207 kfree(kbuf);
3208 return -ENOMEM;
3209 }
3210 proc_skip_char(&p, &left, '\n');
3211 while (!err && left) {
3212 unsigned long val_a, val_b;
3213 bool neg;
3214 size_t saved_left;
3215
3216 /* In case we stop parsing mid-number, we can reset */
3217 saved_left = left;
3218 err = proc_get_long(&p, &left, &val_a, &neg, tr_a,
3219 sizeof(tr_a), &c);
3220 /*
3221 * If we consumed the entirety of a truncated buffer or
3222 * only one char is left (may be a "-"), then stop here,
3223 * reset, & come back for more.
3224 */
3225 if ((left <= 1) && skipped) {
3226 left = saved_left;
3227 break;
3228 }
3229
3230 if (err)
3231 break;
3232 if (val_a >= bitmap_len || neg) {
3233 err = -EINVAL;
3234 break;
3235 }
3236
3237 val_b = val_a;
3238 if (left) {
3239 p++;
3240 left--;
3241 }
3242
3243 if (c == '-') {
3244 err = proc_get_long(&p, &left, &val_b,
3245 &neg, tr_b, sizeof(tr_b),
3246 &c);
3247 /*
3248 * If we consumed all of a truncated buffer or
3249 * then stop here, reset, & come back for more.
3250 */
3251 if (!left && skipped) {
3252 left = saved_left;
3253 break;
3254 }
3255
3256 if (err)
3257 break;
3258 if (val_b >= bitmap_len || neg ||
3259 val_a > val_b) {
3260 err = -EINVAL;
3261 break;
3262 }
3263 if (left) {
3264 p++;
3265 left--;
3266 }
3267 }
3268
3269 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
3270 first = 0;
3271 proc_skip_char(&p, &left, '\n');
3272 }
3273 kfree(kbuf);
3274 left += skipped;
3275 } else {
3276 unsigned long bit_a, bit_b = 0;
3277
3278 while (left) {
3279 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
3280 if (bit_a >= bitmap_len)
3281 break;
3282 bit_b = find_next_zero_bit(bitmap, bitmap_len,
3283 bit_a + 1) - 1;
3284
3285 if (!first) {
3286 err = proc_put_char(&buffer, &left, ',');
3287 if (err)
3288 break;
3289 }
3290 err = proc_put_long(&buffer, &left, bit_a, false);
3291 if (err)
3292 break;
3293 if (bit_a != bit_b) {
3294 err = proc_put_char(&buffer, &left, '-');
3295 if (err)
3296 break;
3297 err = proc_put_long(&buffer, &left, bit_b, false);
3298 if (err)
3299 break;
3300 }
3301
3302 first = 0; bit_b++;
3303 }
3304 if (!err)
3305 err = proc_put_char(&buffer, &left, '\n');
3306 }
3307
3308 if (!err) {
3309 if (write) {
3310 if (*ppos)
3311 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
3312 else
3313 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
3314 }
3315 *lenp -= left;
3316 *ppos += *lenp;
3317 }
3318
3319 bitmap_free(tmp_bitmap);
3320 return err;
3321 }
3322
3323 #else /* CONFIG_PROC_SYSCTL */
3324
proc_dostring(struct ctl_table * table,int write,void __user * buffer,size_t * lenp,loff_t * ppos)3325 int proc_dostring(struct ctl_table *table, int write,
3326 void __user *buffer, size_t *lenp, loff_t *ppos)
3327 {
3328 return -ENOSYS;
3329 }
3330
proc_dointvec(struct ctl_table * table,int write,void __user * buffer,size_t * lenp,loff_t * ppos)3331 int proc_dointvec(struct ctl_table *table, int write,
3332 void __user *buffer, size_t *lenp, loff_t *ppos)
3333 {
3334 return -ENOSYS;
3335 }
3336
proc_douintvec(struct ctl_table * table,int write,void __user * buffer,size_t * lenp,loff_t * ppos)3337 int proc_douintvec(struct ctl_table *table, int write,
3338 void __user *buffer, size_t *lenp, loff_t *ppos)
3339 {
3340 return -ENOSYS;
3341 }
3342
proc_dointvec_minmax(struct ctl_table * table,int write,void __user * buffer,size_t * lenp,loff_t * ppos)3343 int proc_dointvec_minmax(struct ctl_table *table, int write,
3344 void __user *buffer, size_t *lenp, loff_t *ppos)
3345 {
3346 return -ENOSYS;
3347 }
3348
proc_douintvec_minmax(struct ctl_table * table,int write,void __user * buffer,size_t * lenp,loff_t * ppos)3349 int proc_douintvec_minmax(struct ctl_table *table, int write,
3350 void __user *buffer, size_t *lenp, loff_t *ppos)
3351 {
3352 return -ENOSYS;
3353 }
3354
proc_dointvec_jiffies(struct ctl_table * table,int write,void __user * buffer,size_t * lenp,loff_t * ppos)3355 int proc_dointvec_jiffies(struct ctl_table *table, int write,
3356 void __user *buffer, size_t *lenp, loff_t *ppos)
3357 {
3358 return -ENOSYS;
3359 }
3360
proc_dointvec_userhz_jiffies(struct ctl_table * table,int write,void __user * buffer,size_t * lenp,loff_t * ppos)3361 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
3362 void __user *buffer, size_t *lenp, loff_t *ppos)
3363 {
3364 return -ENOSYS;
3365 }
3366
proc_dointvec_ms_jiffies(struct ctl_table * table,int write,void __user * buffer,size_t * lenp,loff_t * ppos)3367 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
3368 void __user *buffer, size_t *lenp, loff_t *ppos)
3369 {
3370 return -ENOSYS;
3371 }
3372
proc_doulongvec_minmax(struct ctl_table * table,int write,void __user * buffer,size_t * lenp,loff_t * ppos)3373 int proc_doulongvec_minmax(struct ctl_table *table, int write,
3374 void __user *buffer, size_t *lenp, loff_t *ppos)
3375 {
3376 return -ENOSYS;
3377 }
3378
proc_doulongvec_ms_jiffies_minmax(struct ctl_table * table,int write,void __user * buffer,size_t * lenp,loff_t * ppos)3379 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
3380 void __user *buffer,
3381 size_t *lenp, loff_t *ppos)
3382 {
3383 return -ENOSYS;
3384 }
3385
proc_do_large_bitmap(struct ctl_table * table,int write,void __user * buffer,size_t * lenp,loff_t * ppos)3386 int proc_do_large_bitmap(struct ctl_table *table, int write,
3387 void __user *buffer, size_t *lenp, loff_t *ppos)
3388 {
3389 return -ENOSYS;
3390 }
3391
3392 #endif /* CONFIG_PROC_SYSCTL */
3393
3394 #if defined(CONFIG_SYSCTL)
proc_do_static_key(struct ctl_table * table,int write,void __user * buffer,size_t * lenp,loff_t * ppos)3395 int proc_do_static_key(struct ctl_table *table, int write,
3396 void __user *buffer, size_t *lenp,
3397 loff_t *ppos)
3398 {
3399 struct static_key *key = (struct static_key *)table->data;
3400 static DEFINE_MUTEX(static_key_mutex);
3401 int val, ret;
3402 struct ctl_table tmp = {
3403 .data = &val,
3404 .maxlen = sizeof(val),
3405 .mode = table->mode,
3406 .extra1 = SYSCTL_ZERO,
3407 .extra2 = SYSCTL_ONE,
3408 };
3409
3410 if (write && !capable(CAP_SYS_ADMIN))
3411 return -EPERM;
3412
3413 mutex_lock(&static_key_mutex);
3414 val = static_key_enabled(key);
3415 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
3416 if (write && !ret) {
3417 if (val)
3418 static_key_enable(key);
3419 else
3420 static_key_disable(key);
3421 }
3422 mutex_unlock(&static_key_mutex);
3423 return ret;
3424 }
3425 #endif
3426 /*
3427 * No sense putting this after each symbol definition, twice,
3428 * exception granted :-)
3429 */
3430 EXPORT_SYMBOL(proc_dointvec);
3431 EXPORT_SYMBOL(proc_douintvec);
3432 EXPORT_SYMBOL(proc_dointvec_jiffies);
3433 EXPORT_SYMBOL(proc_dointvec_minmax);
3434 EXPORT_SYMBOL_GPL(proc_douintvec_minmax);
3435 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
3436 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
3437 EXPORT_SYMBOL(proc_dostring);
3438 EXPORT_SYMBOL(proc_doulongvec_minmax);
3439 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
3440 EXPORT_SYMBOL(proc_do_large_bitmap);
3441