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Merge tag 'for-linus-20180825' of git://git.kernel.dk/linux-block
[mirror_ubuntu-jammy-kernel.git] / kernel / sysctl.c
1 /*
2 * sysctl.c: General linux system control interface
3 *
4 * Begun 24 March 1995, Stephen Tweedie
5 * Added /proc support, Dec 1995
6 * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
7 * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
8 * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
9 * Dynamic registration fixes, Stephen Tweedie.
10 * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
11 * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
12 * Horn.
13 * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
14 * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
15 * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
16 * Wendling.
17 * The list_for_each() macro wasn't appropriate for the sysctl loop.
18 * Removed it and replaced it with older style, 03/23/00, Bill Wendling
19 */
20
21 #include <linux/module.h>
22 #include <linux/aio.h>
23 #include <linux/mm.h>
24 #include <linux/swap.h>
25 #include <linux/slab.h>
26 #include <linux/sysctl.h>
27 #include <linux/bitmap.h>
28 #include <linux/signal.h>
29 #include <linux/printk.h>
30 #include <linux/proc_fs.h>
31 #include <linux/security.h>
32 #include <linux/ctype.h>
33 #include <linux/kmemleak.h>
34 #include <linux/fs.h>
35 #include <linux/init.h>
36 #include <linux/kernel.h>
37 #include <linux/kobject.h>
38 #include <linux/net.h>
39 #include <linux/sysrq.h>
40 #include <linux/highuid.h>
41 #include <linux/writeback.h>
42 #include <linux/ratelimit.h>
43 #include <linux/compaction.h>
44 #include <linux/hugetlb.h>
45 #include <linux/initrd.h>
46 #include <linux/key.h>
47 #include <linux/times.h>
48 #include <linux/limits.h>
49 #include <linux/dcache.h>
50 #include <linux/dnotify.h>
51 #include <linux/syscalls.h>
52 #include <linux/vmstat.h>
53 #include <linux/nfs_fs.h>
54 #include <linux/acpi.h>
55 #include <linux/reboot.h>
56 #include <linux/ftrace.h>
57 #include <linux/perf_event.h>
58 #include <linux/kprobes.h>
59 #include <linux/pipe_fs_i.h>
60 #include <linux/oom.h>
61 #include <linux/kmod.h>
62 #include <linux/capability.h>
63 #include <linux/binfmts.h>
64 #include <linux/sched/sysctl.h>
65 #include <linux/sched/coredump.h>
66 #include <linux/kexec.h>
67 #include <linux/bpf.h>
68 #include <linux/mount.h>
69 #include <linux/pipe_fs_i.h>
70
71 #include <linux/uaccess.h>
72 #include <asm/processor.h>
73
74 #ifdef CONFIG_X86
75 #include <asm/nmi.h>
76 #include <asm/stacktrace.h>
77 #include <asm/io.h>
78 #endif
79 #ifdef CONFIG_SPARC
80 #include <asm/setup.h>
81 #endif
82 #ifdef CONFIG_BSD_PROCESS_ACCT
83 #include <linux/acct.h>
84 #endif
85 #ifdef CONFIG_RT_MUTEXES
86 #include <linux/rtmutex.h>
87 #endif
88 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
89 #include <linux/lockdep.h>
90 #endif
91 #ifdef CONFIG_CHR_DEV_SG
92 #include <scsi/sg.h>
93 #endif
94
95 #ifdef CONFIG_LOCKUP_DETECTOR
96 #include <linux/nmi.h>
97 #endif
98
99 #if defined(CONFIG_SYSCTL)
100
101 /* External variables not in a header file. */
102 extern int suid_dumpable;
103 #ifdef CONFIG_COREDUMP
104 extern int core_uses_pid;
105 extern char core_pattern[];
106 extern unsigned int core_pipe_limit;
107 #endif
108 extern int pid_max;
109 extern int pid_max_min, pid_max_max;
110 extern int percpu_pagelist_fraction;
111 extern int latencytop_enabled;
112 extern unsigned int sysctl_nr_open_min, sysctl_nr_open_max;
113 #ifndef CONFIG_MMU
114 extern int sysctl_nr_trim_pages;
115 #endif
116
117 /* Constants used for minimum and maximum */
118 #ifdef CONFIG_LOCKUP_DETECTOR
119 static int sixty = 60;
120 #endif
121
122 static int __maybe_unused neg_one = -1;
123
124 static int zero;
125 static int __maybe_unused one = 1;
126 static int __maybe_unused two = 2;
127 static int __maybe_unused four = 4;
128 static unsigned long one_ul = 1;
129 static int one_hundred = 100;
130 static int one_thousand = 1000;
131 #ifdef CONFIG_PRINTK
132 static int ten_thousand = 10000;
133 #endif
134 #ifdef CONFIG_PERF_EVENTS
135 static int six_hundred_forty_kb = 640 * 1024;
136 #endif
137
138 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
139 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
140
141 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
142 static int maxolduid = 65535;
143 static int minolduid;
144
145 static int ngroups_max = NGROUPS_MAX;
146 static const int cap_last_cap = CAP_LAST_CAP;
147
148 /*
149 * This is needed for proc_doulongvec_minmax of sysctl_hung_task_timeout_secs
150 * and hung_task_check_interval_secs
151 */
152 #ifdef CONFIG_DETECT_HUNG_TASK
153 static unsigned long hung_task_timeout_max = (LONG_MAX/HZ);
154 #endif
155
156 #ifdef CONFIG_INOTIFY_USER
157 #include <linux/inotify.h>
158 #endif
159 #ifdef CONFIG_SPARC
160 #endif
161
162 #ifdef __hppa__
163 extern int pwrsw_enabled;
164 #endif
165
166 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
167 extern int unaligned_enabled;
168 #endif
169
170 #ifdef CONFIG_IA64
171 extern int unaligned_dump_stack;
172 #endif
173
174 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
175 extern int no_unaligned_warning;
176 #endif
177
178 #ifdef CONFIG_PROC_SYSCTL
179
180 /**
181 * enum sysctl_writes_mode - supported sysctl write modes
182 *
183 * @SYSCTL_WRITES_LEGACY: each write syscall must fully contain the sysctl value
184 * to be written, and multiple writes on the same sysctl file descriptor
185 * will rewrite the sysctl value, regardless of file position. No warning
186 * is issued when the initial position is not 0.
187 * @SYSCTL_WRITES_WARN: same as above but warn when the initial file position is
188 * not 0.
189 * @SYSCTL_WRITES_STRICT: writes to numeric sysctl entries must always be at
190 * file position 0 and the value must be fully contained in the buffer
191 * sent to the write syscall. If dealing with strings respect the file
192 * position, but restrict this to the max length of the buffer, anything
193 * passed the max lenght will be ignored. Multiple writes will append
194 * to the buffer.
195 *
196 * These write modes control how current file position affects the behavior of
197 * updating sysctl values through the proc interface on each write.
198 */
199 enum sysctl_writes_mode {
200 SYSCTL_WRITES_LEGACY = -1,
201 SYSCTL_WRITES_WARN = 0,
202 SYSCTL_WRITES_STRICT = 1,
203 };
204
205 static enum sysctl_writes_mode sysctl_writes_strict = SYSCTL_WRITES_STRICT;
206
207 static int proc_do_cad_pid(struct ctl_table *table, int write,
208 void __user *buffer, size_t *lenp, loff_t *ppos);
209 static int proc_taint(struct ctl_table *table, int write,
210 void __user *buffer, size_t *lenp, loff_t *ppos);
211 #endif
212
213 #ifdef CONFIG_PRINTK
214 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
215 void __user *buffer, size_t *lenp, loff_t *ppos);
216 #endif
217
218 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
219 void __user *buffer, size_t *lenp, loff_t *ppos);
220 #ifdef CONFIG_COREDUMP
221 static int proc_dostring_coredump(struct ctl_table *table, int write,
222 void __user *buffer, size_t *lenp, loff_t *ppos);
223 #endif
224 static int proc_dopipe_max_size(struct ctl_table *table, int write,
225 void __user *buffer, size_t *lenp, loff_t *ppos);
226
227 #ifdef CONFIG_MAGIC_SYSRQ
228 /* Note: sysrq code uses its own private copy */
229 static int __sysrq_enabled = CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE;
230
231 static int sysrq_sysctl_handler(struct ctl_table *table, int write,
232 void __user *buffer, size_t *lenp,
233 loff_t *ppos)
234 {
235 int error;
236
237 error = proc_dointvec(table, write, buffer, lenp, ppos);
238 if (error)
239 return error;
240
241 if (write)
242 sysrq_toggle_support(__sysrq_enabled);
243
244 return 0;
245 }
246
247 #endif
248
249 static struct ctl_table kern_table[];
250 static struct ctl_table vm_table[];
251 static struct ctl_table fs_table[];
252 static struct ctl_table debug_table[];
253 static struct ctl_table dev_table[];
254 extern struct ctl_table random_table[];
255 #ifdef CONFIG_EPOLL
256 extern struct ctl_table epoll_table[];
257 #endif
258
259 #ifdef CONFIG_FW_LOADER_USER_HELPER
260 extern struct ctl_table firmware_config_table[];
261 #endif
262
263 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
264 int sysctl_legacy_va_layout;
265 #endif
266
267 /* The default sysctl tables: */
268
269 static struct ctl_table sysctl_base_table[] = {
270 {
271 .procname = "kernel",
272 .mode = 0555,
273 .child = kern_table,
274 },
275 {
276 .procname = "vm",
277 .mode = 0555,
278 .child = vm_table,
279 },
280 {
281 .procname = "fs",
282 .mode = 0555,
283 .child = fs_table,
284 },
285 {
286 .procname = "debug",
287 .mode = 0555,
288 .child = debug_table,
289 },
290 {
291 .procname = "dev",
292 .mode = 0555,
293 .child = dev_table,
294 },
295 { }
296 };
297
298 #ifdef CONFIG_SCHED_DEBUG
299 static int min_sched_granularity_ns = 100000; /* 100 usecs */
300 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
301 static int min_wakeup_granularity_ns; /* 0 usecs */
302 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
303 #ifdef CONFIG_SMP
304 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
305 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
306 #endif /* CONFIG_SMP */
307 #endif /* CONFIG_SCHED_DEBUG */
308
309 #ifdef CONFIG_COMPACTION
310 static int min_extfrag_threshold;
311 static int max_extfrag_threshold = 1000;
312 #endif
313
314 static struct ctl_table kern_table[] = {
315 {
316 .procname = "sched_child_runs_first",
317 .data = &sysctl_sched_child_runs_first,
318 .maxlen = sizeof(unsigned int),
319 .mode = 0644,
320 .proc_handler = proc_dointvec,
321 },
322 #ifdef CONFIG_SCHED_DEBUG
323 {
324 .procname = "sched_min_granularity_ns",
325 .data = &sysctl_sched_min_granularity,
326 .maxlen = sizeof(unsigned int),
327 .mode = 0644,
328 .proc_handler = sched_proc_update_handler,
329 .extra1 = &min_sched_granularity_ns,
330 .extra2 = &max_sched_granularity_ns,
331 },
332 {
333 .procname = "sched_latency_ns",
334 .data = &sysctl_sched_latency,
335 .maxlen = sizeof(unsigned int),
336 .mode = 0644,
337 .proc_handler = sched_proc_update_handler,
338 .extra1 = &min_sched_granularity_ns,
339 .extra2 = &max_sched_granularity_ns,
340 },
341 {
342 .procname = "sched_wakeup_granularity_ns",
343 .data = &sysctl_sched_wakeup_granularity,
344 .maxlen = sizeof(unsigned int),
345 .mode = 0644,
346 .proc_handler = sched_proc_update_handler,
347 .extra1 = &min_wakeup_granularity_ns,
348 .extra2 = &max_wakeup_granularity_ns,
349 },
350 #ifdef CONFIG_SMP
351 {
352 .procname = "sched_tunable_scaling",
353 .data = &sysctl_sched_tunable_scaling,
354 .maxlen = sizeof(enum sched_tunable_scaling),
355 .mode = 0644,
356 .proc_handler = sched_proc_update_handler,
357 .extra1 = &min_sched_tunable_scaling,
358 .extra2 = &max_sched_tunable_scaling,
359 },
360 {
361 .procname = "sched_migration_cost_ns",
362 .data = &sysctl_sched_migration_cost,
363 .maxlen = sizeof(unsigned int),
364 .mode = 0644,
365 .proc_handler = proc_dointvec,
366 },
367 {
368 .procname = "sched_nr_migrate",
369 .data = &sysctl_sched_nr_migrate,
370 .maxlen = sizeof(unsigned int),
371 .mode = 0644,
372 .proc_handler = proc_dointvec,
373 },
374 #ifdef CONFIG_SCHEDSTATS
375 {
376 .procname = "sched_schedstats",
377 .data = NULL,
378 .maxlen = sizeof(unsigned int),
379 .mode = 0644,
380 .proc_handler = sysctl_schedstats,
381 .extra1 = &zero,
382 .extra2 = &one,
383 },
384 #endif /* CONFIG_SCHEDSTATS */
385 #endif /* CONFIG_SMP */
386 #ifdef CONFIG_NUMA_BALANCING
387 {
388 .procname = "numa_balancing_scan_delay_ms",
389 .data = &sysctl_numa_balancing_scan_delay,
390 .maxlen = sizeof(unsigned int),
391 .mode = 0644,
392 .proc_handler = proc_dointvec,
393 },
394 {
395 .procname = "numa_balancing_scan_period_min_ms",
396 .data = &sysctl_numa_balancing_scan_period_min,
397 .maxlen = sizeof(unsigned int),
398 .mode = 0644,
399 .proc_handler = proc_dointvec,
400 },
401 {
402 .procname = "numa_balancing_scan_period_max_ms",
403 .data = &sysctl_numa_balancing_scan_period_max,
404 .maxlen = sizeof(unsigned int),
405 .mode = 0644,
406 .proc_handler = proc_dointvec,
407 },
408 {
409 .procname = "numa_balancing_scan_size_mb",
410 .data = &sysctl_numa_balancing_scan_size,
411 .maxlen = sizeof(unsigned int),
412 .mode = 0644,
413 .proc_handler = proc_dointvec_minmax,
414 .extra1 = &one,
415 },
416 {
417 .procname = "numa_balancing",
418 .data = NULL, /* filled in by handler */
419 .maxlen = sizeof(unsigned int),
420 .mode = 0644,
421 .proc_handler = sysctl_numa_balancing,
422 .extra1 = &zero,
423 .extra2 = &one,
424 },
425 #endif /* CONFIG_NUMA_BALANCING */
426 #endif /* CONFIG_SCHED_DEBUG */
427 {
428 .procname = "sched_rt_period_us",
429 .data = &sysctl_sched_rt_period,
430 .maxlen = sizeof(unsigned int),
431 .mode = 0644,
432 .proc_handler = sched_rt_handler,
433 },
434 {
435 .procname = "sched_rt_runtime_us",
436 .data = &sysctl_sched_rt_runtime,
437 .maxlen = sizeof(int),
438 .mode = 0644,
439 .proc_handler = sched_rt_handler,
440 },
441 {
442 .procname = "sched_rr_timeslice_ms",
443 .data = &sysctl_sched_rr_timeslice,
444 .maxlen = sizeof(int),
445 .mode = 0644,
446 .proc_handler = sched_rr_handler,
447 },
448 #ifdef CONFIG_SCHED_AUTOGROUP
449 {
450 .procname = "sched_autogroup_enabled",
451 .data = &sysctl_sched_autogroup_enabled,
452 .maxlen = sizeof(unsigned int),
453 .mode = 0644,
454 .proc_handler = proc_dointvec_minmax,
455 .extra1 = &zero,
456 .extra2 = &one,
457 },
458 #endif
459 #ifdef CONFIG_CFS_BANDWIDTH
460 {
461 .procname = "sched_cfs_bandwidth_slice_us",
462 .data = &sysctl_sched_cfs_bandwidth_slice,
463 .maxlen = sizeof(unsigned int),
464 .mode = 0644,
465 .proc_handler = proc_dointvec_minmax,
466 .extra1 = &one,
467 },
468 #endif
469 #ifdef CONFIG_PROVE_LOCKING
470 {
471 .procname = "prove_locking",
472 .data = &prove_locking,
473 .maxlen = sizeof(int),
474 .mode = 0644,
475 .proc_handler = proc_dointvec,
476 },
477 #endif
478 #ifdef CONFIG_LOCK_STAT
479 {
480 .procname = "lock_stat",
481 .data = &lock_stat,
482 .maxlen = sizeof(int),
483 .mode = 0644,
484 .proc_handler = proc_dointvec,
485 },
486 #endif
487 {
488 .procname = "panic",
489 .data = &panic_timeout,
490 .maxlen = sizeof(int),
491 .mode = 0644,
492 .proc_handler = proc_dointvec,
493 },
494 #ifdef CONFIG_COREDUMP
495 {
496 .procname = "core_uses_pid",
497 .data = &core_uses_pid,
498 .maxlen = sizeof(int),
499 .mode = 0644,
500 .proc_handler = proc_dointvec,
501 },
502 {
503 .procname = "core_pattern",
504 .data = core_pattern,
505 .maxlen = CORENAME_MAX_SIZE,
506 .mode = 0644,
507 .proc_handler = proc_dostring_coredump,
508 },
509 {
510 .procname = "core_pipe_limit",
511 .data = &core_pipe_limit,
512 .maxlen = sizeof(unsigned int),
513 .mode = 0644,
514 .proc_handler = proc_dointvec,
515 },
516 #endif
517 #ifdef CONFIG_PROC_SYSCTL
518 {
519 .procname = "tainted",
520 .maxlen = sizeof(long),
521 .mode = 0644,
522 .proc_handler = proc_taint,
523 },
524 {
525 .procname = "sysctl_writes_strict",
526 .data = &sysctl_writes_strict,
527 .maxlen = sizeof(int),
528 .mode = 0644,
529 .proc_handler = proc_dointvec_minmax,
530 .extra1 = &neg_one,
531 .extra2 = &one,
532 },
533 #endif
534 #ifdef CONFIG_LATENCYTOP
535 {
536 .procname = "latencytop",
537 .data = &latencytop_enabled,
538 .maxlen = sizeof(int),
539 .mode = 0644,
540 .proc_handler = sysctl_latencytop,
541 },
542 #endif
543 #ifdef CONFIG_BLK_DEV_INITRD
544 {
545 .procname = "real-root-dev",
546 .data = &real_root_dev,
547 .maxlen = sizeof(int),
548 .mode = 0644,
549 .proc_handler = proc_dointvec,
550 },
551 #endif
552 {
553 .procname = "print-fatal-signals",
554 .data = &print_fatal_signals,
555 .maxlen = sizeof(int),
556 .mode = 0644,
557 .proc_handler = proc_dointvec,
558 },
559 #ifdef CONFIG_SPARC
560 {
561 .procname = "reboot-cmd",
562 .data = reboot_command,
563 .maxlen = 256,
564 .mode = 0644,
565 .proc_handler = proc_dostring,
566 },
567 {
568 .procname = "stop-a",
569 .data = &stop_a_enabled,
570 .maxlen = sizeof (int),
571 .mode = 0644,
572 .proc_handler = proc_dointvec,
573 },
574 {
575 .procname = "scons-poweroff",
576 .data = &scons_pwroff,
577 .maxlen = sizeof (int),
578 .mode = 0644,
579 .proc_handler = proc_dointvec,
580 },
581 #endif
582 #ifdef CONFIG_SPARC64
583 {
584 .procname = "tsb-ratio",
585 .data = &sysctl_tsb_ratio,
586 .maxlen = sizeof (int),
587 .mode = 0644,
588 .proc_handler = proc_dointvec,
589 },
590 #endif
591 #ifdef __hppa__
592 {
593 .procname = "soft-power",
594 .data = &pwrsw_enabled,
595 .maxlen = sizeof (int),
596 .mode = 0644,
597 .proc_handler = proc_dointvec,
598 },
599 #endif
600 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
601 {
602 .procname = "unaligned-trap",
603 .data = &unaligned_enabled,
604 .maxlen = sizeof (int),
605 .mode = 0644,
606 .proc_handler = proc_dointvec,
607 },
608 #endif
609 {
610 .procname = "ctrl-alt-del",
611 .data = &C_A_D,
612 .maxlen = sizeof(int),
613 .mode = 0644,
614 .proc_handler = proc_dointvec,
615 },
616 #ifdef CONFIG_FUNCTION_TRACER
617 {
618 .procname = "ftrace_enabled",
619 .data = &ftrace_enabled,
620 .maxlen = sizeof(int),
621 .mode = 0644,
622 .proc_handler = ftrace_enable_sysctl,
623 },
624 #endif
625 #ifdef CONFIG_STACK_TRACER
626 {
627 .procname = "stack_tracer_enabled",
628 .data = &stack_tracer_enabled,
629 .maxlen = sizeof(int),
630 .mode = 0644,
631 .proc_handler = stack_trace_sysctl,
632 },
633 #endif
634 #ifdef CONFIG_TRACING
635 {
636 .procname = "ftrace_dump_on_oops",
637 .data = &ftrace_dump_on_oops,
638 .maxlen = sizeof(int),
639 .mode = 0644,
640 .proc_handler = proc_dointvec,
641 },
642 {
643 .procname = "traceoff_on_warning",
644 .data = &__disable_trace_on_warning,
645 .maxlen = sizeof(__disable_trace_on_warning),
646 .mode = 0644,
647 .proc_handler = proc_dointvec,
648 },
649 {
650 .procname = "tracepoint_printk",
651 .data = &tracepoint_printk,
652 .maxlen = sizeof(tracepoint_printk),
653 .mode = 0644,
654 .proc_handler = tracepoint_printk_sysctl,
655 },
656 #endif
657 #ifdef CONFIG_KEXEC_CORE
658 {
659 .procname = "kexec_load_disabled",
660 .data = &kexec_load_disabled,
661 .maxlen = sizeof(int),
662 .mode = 0644,
663 /* only handle a transition from default "0" to "1" */
664 .proc_handler = proc_dointvec_minmax,
665 .extra1 = &one,
666 .extra2 = &one,
667 },
668 #endif
669 #ifdef CONFIG_MODULES
670 {
671 .procname = "modprobe",
672 .data = &modprobe_path,
673 .maxlen = KMOD_PATH_LEN,
674 .mode = 0644,
675 .proc_handler = proc_dostring,
676 },
677 {
678 .procname = "modules_disabled",
679 .data = &modules_disabled,
680 .maxlen = sizeof(int),
681 .mode = 0644,
682 /* only handle a transition from default "0" to "1" */
683 .proc_handler = proc_dointvec_minmax,
684 .extra1 = &one,
685 .extra2 = &one,
686 },
687 #endif
688 #ifdef CONFIG_UEVENT_HELPER
689 {
690 .procname = "hotplug",
691 .data = &uevent_helper,
692 .maxlen = UEVENT_HELPER_PATH_LEN,
693 .mode = 0644,
694 .proc_handler = proc_dostring,
695 },
696 #endif
697 #ifdef CONFIG_CHR_DEV_SG
698 {
699 .procname = "sg-big-buff",
700 .data = &sg_big_buff,
701 .maxlen = sizeof (int),
702 .mode = 0444,
703 .proc_handler = proc_dointvec,
704 },
705 #endif
706 #ifdef CONFIG_BSD_PROCESS_ACCT
707 {
708 .procname = "acct",
709 .data = &acct_parm,
710 .maxlen = 3*sizeof(int),
711 .mode = 0644,
712 .proc_handler = proc_dointvec,
713 },
714 #endif
715 #ifdef CONFIG_MAGIC_SYSRQ
716 {
717 .procname = "sysrq",
718 .data = &__sysrq_enabled,
719 .maxlen = sizeof (int),
720 .mode = 0644,
721 .proc_handler = sysrq_sysctl_handler,
722 },
723 #endif
724 #ifdef CONFIG_PROC_SYSCTL
725 {
726 .procname = "cad_pid",
727 .data = NULL,
728 .maxlen = sizeof (int),
729 .mode = 0600,
730 .proc_handler = proc_do_cad_pid,
731 },
732 #endif
733 {
734 .procname = "threads-max",
735 .data = NULL,
736 .maxlen = sizeof(int),
737 .mode = 0644,
738 .proc_handler = sysctl_max_threads,
739 },
740 {
741 .procname = "random",
742 .mode = 0555,
743 .child = random_table,
744 },
745 {
746 .procname = "usermodehelper",
747 .mode = 0555,
748 .child = usermodehelper_table,
749 },
750 #ifdef CONFIG_FW_LOADER_USER_HELPER
751 {
752 .procname = "firmware_config",
753 .mode = 0555,
754 .child = firmware_config_table,
755 },
756 #endif
757 {
758 .procname = "overflowuid",
759 .data = &overflowuid,
760 .maxlen = sizeof(int),
761 .mode = 0644,
762 .proc_handler = proc_dointvec_minmax,
763 .extra1 = &minolduid,
764 .extra2 = &maxolduid,
765 },
766 {
767 .procname = "overflowgid",
768 .data = &overflowgid,
769 .maxlen = sizeof(int),
770 .mode = 0644,
771 .proc_handler = proc_dointvec_minmax,
772 .extra1 = &minolduid,
773 .extra2 = &maxolduid,
774 },
775 #ifdef CONFIG_S390
776 #ifdef CONFIG_MATHEMU
777 {
778 .procname = "ieee_emulation_warnings",
779 .data = &sysctl_ieee_emulation_warnings,
780 .maxlen = sizeof(int),
781 .mode = 0644,
782 .proc_handler = proc_dointvec,
783 },
784 #endif
785 {
786 .procname = "userprocess_debug",
787 .data = &show_unhandled_signals,
788 .maxlen = sizeof(int),
789 .mode = 0644,
790 .proc_handler = proc_dointvec,
791 },
792 #endif
793 {
794 .procname = "pid_max",
795 .data = &pid_max,
796 .maxlen = sizeof (int),
797 .mode = 0644,
798 .proc_handler = proc_dointvec_minmax,
799 .extra1 = &pid_max_min,
800 .extra2 = &pid_max_max,
801 },
802 {
803 .procname = "panic_on_oops",
804 .data = &panic_on_oops,
805 .maxlen = sizeof(int),
806 .mode = 0644,
807 .proc_handler = proc_dointvec,
808 },
809 #if defined CONFIG_PRINTK
810 {
811 .procname = "printk",
812 .data = &console_loglevel,
813 .maxlen = 4*sizeof(int),
814 .mode = 0644,
815 .proc_handler = proc_dointvec,
816 },
817 {
818 .procname = "printk_ratelimit",
819 .data = &printk_ratelimit_state.interval,
820 .maxlen = sizeof(int),
821 .mode = 0644,
822 .proc_handler = proc_dointvec_jiffies,
823 },
824 {
825 .procname = "printk_ratelimit_burst",
826 .data = &printk_ratelimit_state.burst,
827 .maxlen = sizeof(int),
828 .mode = 0644,
829 .proc_handler = proc_dointvec,
830 },
831 {
832 .procname = "printk_delay",
833 .data = &printk_delay_msec,
834 .maxlen = sizeof(int),
835 .mode = 0644,
836 .proc_handler = proc_dointvec_minmax,
837 .extra1 = &zero,
838 .extra2 = &ten_thousand,
839 },
840 {
841 .procname = "printk_devkmsg",
842 .data = devkmsg_log_str,
843 .maxlen = DEVKMSG_STR_MAX_SIZE,
844 .mode = 0644,
845 .proc_handler = devkmsg_sysctl_set_loglvl,
846 },
847 {
848 .procname = "dmesg_restrict",
849 .data = &dmesg_restrict,
850 .maxlen = sizeof(int),
851 .mode = 0644,
852 .proc_handler = proc_dointvec_minmax_sysadmin,
853 .extra1 = &zero,
854 .extra2 = &one,
855 },
856 {
857 .procname = "kptr_restrict",
858 .data = &kptr_restrict,
859 .maxlen = sizeof(int),
860 .mode = 0644,
861 .proc_handler = proc_dointvec_minmax_sysadmin,
862 .extra1 = &zero,
863 .extra2 = &two,
864 },
865 #endif
866 {
867 .procname = "ngroups_max",
868 .data = &ngroups_max,
869 .maxlen = sizeof (int),
870 .mode = 0444,
871 .proc_handler = proc_dointvec,
872 },
873 {
874 .procname = "cap_last_cap",
875 .data = (void *)&cap_last_cap,
876 .maxlen = sizeof(int),
877 .mode = 0444,
878 .proc_handler = proc_dointvec,
879 },
880 #if defined(CONFIG_LOCKUP_DETECTOR)
881 {
882 .procname = "watchdog",
883 .data = &watchdog_user_enabled,
884 .maxlen = sizeof(int),
885 .mode = 0644,
886 .proc_handler = proc_watchdog,
887 .extra1 = &zero,
888 .extra2 = &one,
889 },
890 {
891 .procname = "watchdog_thresh",
892 .data = &watchdog_thresh,
893 .maxlen = sizeof(int),
894 .mode = 0644,
895 .proc_handler = proc_watchdog_thresh,
896 .extra1 = &zero,
897 .extra2 = &sixty,
898 },
899 {
900 .procname = "nmi_watchdog",
901 .data = &nmi_watchdog_user_enabled,
902 .maxlen = sizeof(int),
903 .mode = NMI_WATCHDOG_SYSCTL_PERM,
904 .proc_handler = proc_nmi_watchdog,
905 .extra1 = &zero,
906 .extra2 = &one,
907 },
908 {
909 .procname = "watchdog_cpumask",
910 .data = &watchdog_cpumask_bits,
911 .maxlen = NR_CPUS,
912 .mode = 0644,
913 .proc_handler = proc_watchdog_cpumask,
914 },
915 #ifdef CONFIG_SOFTLOCKUP_DETECTOR
916 {
917 .procname = "soft_watchdog",
918 .data = &soft_watchdog_user_enabled,
919 .maxlen = sizeof(int),
920 .mode = 0644,
921 .proc_handler = proc_soft_watchdog,
922 .extra1 = &zero,
923 .extra2 = &one,
924 },
925 {
926 .procname = "softlockup_panic",
927 .data = &softlockup_panic,
928 .maxlen = sizeof(int),
929 .mode = 0644,
930 .proc_handler = proc_dointvec_minmax,
931 .extra1 = &zero,
932 .extra2 = &one,
933 },
934 #ifdef CONFIG_SMP
935 {
936 .procname = "softlockup_all_cpu_backtrace",
937 .data = &sysctl_softlockup_all_cpu_backtrace,
938 .maxlen = sizeof(int),
939 .mode = 0644,
940 .proc_handler = proc_dointvec_minmax,
941 .extra1 = &zero,
942 .extra2 = &one,
943 },
944 #endif /* CONFIG_SMP */
945 #endif
946 #ifdef CONFIG_HARDLOCKUP_DETECTOR
947 {
948 .procname = "hardlockup_panic",
949 .data = &hardlockup_panic,
950 .maxlen = sizeof(int),
951 .mode = 0644,
952 .proc_handler = proc_dointvec_minmax,
953 .extra1 = &zero,
954 .extra2 = &one,
955 },
956 #ifdef CONFIG_SMP
957 {
958 .procname = "hardlockup_all_cpu_backtrace",
959 .data = &sysctl_hardlockup_all_cpu_backtrace,
960 .maxlen = sizeof(int),
961 .mode = 0644,
962 .proc_handler = proc_dointvec_minmax,
963 .extra1 = &zero,
964 .extra2 = &one,
965 },
966 #endif /* CONFIG_SMP */
967 #endif
968 #endif
969
970 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
971 {
972 .procname = "unknown_nmi_panic",
973 .data = &unknown_nmi_panic,
974 .maxlen = sizeof (int),
975 .mode = 0644,
976 .proc_handler = proc_dointvec,
977 },
978 #endif
979 #if defined(CONFIG_X86)
980 {
981 .procname = "panic_on_unrecovered_nmi",
982 .data = &panic_on_unrecovered_nmi,
983 .maxlen = sizeof(int),
984 .mode = 0644,
985 .proc_handler = proc_dointvec,
986 },
987 {
988 .procname = "panic_on_io_nmi",
989 .data = &panic_on_io_nmi,
990 .maxlen = sizeof(int),
991 .mode = 0644,
992 .proc_handler = proc_dointvec,
993 },
994 #ifdef CONFIG_DEBUG_STACKOVERFLOW
995 {
996 .procname = "panic_on_stackoverflow",
997 .data = &sysctl_panic_on_stackoverflow,
998 .maxlen = sizeof(int),
999 .mode = 0644,
1000 .proc_handler = proc_dointvec,
1001 },
1002 #endif
1003 {
1004 .procname = "bootloader_type",
1005 .data = &bootloader_type,
1006 .maxlen = sizeof (int),
1007 .mode = 0444,
1008 .proc_handler = proc_dointvec,
1009 },
1010 {
1011 .procname = "bootloader_version",
1012 .data = &bootloader_version,
1013 .maxlen = sizeof (int),
1014 .mode = 0444,
1015 .proc_handler = proc_dointvec,
1016 },
1017 {
1018 .procname = "io_delay_type",
1019 .data = &io_delay_type,
1020 .maxlen = sizeof(int),
1021 .mode = 0644,
1022 .proc_handler = proc_dointvec,
1023 },
1024 #endif
1025 #if defined(CONFIG_MMU)
1026 {
1027 .procname = "randomize_va_space",
1028 .data = &randomize_va_space,
1029 .maxlen = sizeof(int),
1030 .mode = 0644,
1031 .proc_handler = proc_dointvec,
1032 },
1033 #endif
1034 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
1035 {
1036 .procname = "spin_retry",
1037 .data = &spin_retry,
1038 .maxlen = sizeof (int),
1039 .mode = 0644,
1040 .proc_handler = proc_dointvec,
1041 },
1042 #endif
1043 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
1044 {
1045 .procname = "acpi_video_flags",
1046 .data = &acpi_realmode_flags,
1047 .maxlen = sizeof (unsigned long),
1048 .mode = 0644,
1049 .proc_handler = proc_doulongvec_minmax,
1050 },
1051 #endif
1052 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
1053 {
1054 .procname = "ignore-unaligned-usertrap",
1055 .data = &no_unaligned_warning,
1056 .maxlen = sizeof (int),
1057 .mode = 0644,
1058 .proc_handler = proc_dointvec,
1059 },
1060 #endif
1061 #ifdef CONFIG_IA64
1062 {
1063 .procname = "unaligned-dump-stack",
1064 .data = &unaligned_dump_stack,
1065 .maxlen = sizeof (int),
1066 .mode = 0644,
1067 .proc_handler = proc_dointvec,
1068 },
1069 #endif
1070 #ifdef CONFIG_DETECT_HUNG_TASK
1071 {
1072 .procname = "hung_task_panic",
1073 .data = &sysctl_hung_task_panic,
1074 .maxlen = sizeof(int),
1075 .mode = 0644,
1076 .proc_handler = proc_dointvec_minmax,
1077 .extra1 = &zero,
1078 .extra2 = &one,
1079 },
1080 {
1081 .procname = "hung_task_check_count",
1082 .data = &sysctl_hung_task_check_count,
1083 .maxlen = sizeof(int),
1084 .mode = 0644,
1085 .proc_handler = proc_dointvec_minmax,
1086 .extra1 = &zero,
1087 },
1088 {
1089 .procname = "hung_task_timeout_secs",
1090 .data = &sysctl_hung_task_timeout_secs,
1091 .maxlen = sizeof(unsigned long),
1092 .mode = 0644,
1093 .proc_handler = proc_dohung_task_timeout_secs,
1094 .extra2 = &hung_task_timeout_max,
1095 },
1096 {
1097 .procname = "hung_task_check_interval_secs",
1098 .data = &sysctl_hung_task_check_interval_secs,
1099 .maxlen = sizeof(unsigned long),
1100 .mode = 0644,
1101 .proc_handler = proc_dohung_task_timeout_secs,
1102 .extra2 = &hung_task_timeout_max,
1103 },
1104 {
1105 .procname = "hung_task_warnings",
1106 .data = &sysctl_hung_task_warnings,
1107 .maxlen = sizeof(int),
1108 .mode = 0644,
1109 .proc_handler = proc_dointvec_minmax,
1110 .extra1 = &neg_one,
1111 },
1112 #endif
1113 #ifdef CONFIG_RT_MUTEXES
1114 {
1115 .procname = "max_lock_depth",
1116 .data = &max_lock_depth,
1117 .maxlen = sizeof(int),
1118 .mode = 0644,
1119 .proc_handler = proc_dointvec,
1120 },
1121 #endif
1122 {
1123 .procname = "poweroff_cmd",
1124 .data = &poweroff_cmd,
1125 .maxlen = POWEROFF_CMD_PATH_LEN,
1126 .mode = 0644,
1127 .proc_handler = proc_dostring,
1128 },
1129 #ifdef CONFIG_KEYS
1130 {
1131 .procname = "keys",
1132 .mode = 0555,
1133 .child = key_sysctls,
1134 },
1135 #endif
1136 #ifdef CONFIG_PERF_EVENTS
1137 /*
1138 * User-space scripts rely on the existence of this file
1139 * as a feature check for perf_events being enabled.
1140 *
1141 * So it's an ABI, do not remove!
1142 */
1143 {
1144 .procname = "perf_event_paranoid",
1145 .data = &sysctl_perf_event_paranoid,
1146 .maxlen = sizeof(sysctl_perf_event_paranoid),
1147 .mode = 0644,
1148 .proc_handler = proc_dointvec,
1149 },
1150 {
1151 .procname = "perf_event_mlock_kb",
1152 .data = &sysctl_perf_event_mlock,
1153 .maxlen = sizeof(sysctl_perf_event_mlock),
1154 .mode = 0644,
1155 .proc_handler = proc_dointvec,
1156 },
1157 {
1158 .procname = "perf_event_max_sample_rate",
1159 .data = &sysctl_perf_event_sample_rate,
1160 .maxlen = sizeof(sysctl_perf_event_sample_rate),
1161 .mode = 0644,
1162 .proc_handler = perf_proc_update_handler,
1163 .extra1 = &one,
1164 },
1165 {
1166 .procname = "perf_cpu_time_max_percent",
1167 .data = &sysctl_perf_cpu_time_max_percent,
1168 .maxlen = sizeof(sysctl_perf_cpu_time_max_percent),
1169 .mode = 0644,
1170 .proc_handler = perf_cpu_time_max_percent_handler,
1171 .extra1 = &zero,
1172 .extra2 = &one_hundred,
1173 },
1174 {
1175 .procname = "perf_event_max_stack",
1176 .data = &sysctl_perf_event_max_stack,
1177 .maxlen = sizeof(sysctl_perf_event_max_stack),
1178 .mode = 0644,
1179 .proc_handler = perf_event_max_stack_handler,
1180 .extra1 = &zero,
1181 .extra2 = &six_hundred_forty_kb,
1182 },
1183 {
1184 .procname = "perf_event_max_contexts_per_stack",
1185 .data = &sysctl_perf_event_max_contexts_per_stack,
1186 .maxlen = sizeof(sysctl_perf_event_max_contexts_per_stack),
1187 .mode = 0644,
1188 .proc_handler = perf_event_max_stack_handler,
1189 .extra1 = &zero,
1190 .extra2 = &one_thousand,
1191 },
1192 #endif
1193 {
1194 .procname = "panic_on_warn",
1195 .data = &panic_on_warn,
1196 .maxlen = sizeof(int),
1197 .mode = 0644,
1198 .proc_handler = proc_dointvec_minmax,
1199 .extra1 = &zero,
1200 .extra2 = &one,
1201 },
1202 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
1203 {
1204 .procname = "timer_migration",
1205 .data = &sysctl_timer_migration,
1206 .maxlen = sizeof(unsigned int),
1207 .mode = 0644,
1208 .proc_handler = timer_migration_handler,
1209 .extra1 = &zero,
1210 .extra2 = &one,
1211 },
1212 #endif
1213 #ifdef CONFIG_BPF_SYSCALL
1214 {
1215 .procname = "unprivileged_bpf_disabled",
1216 .data = &sysctl_unprivileged_bpf_disabled,
1217 .maxlen = sizeof(sysctl_unprivileged_bpf_disabled),
1218 .mode = 0644,
1219 /* only handle a transition from default "0" to "1" */
1220 .proc_handler = proc_dointvec_minmax,
1221 .extra1 = &one,
1222 .extra2 = &one,
1223 },
1224 #endif
1225 #if defined(CONFIG_TREE_RCU) || defined(CONFIG_PREEMPT_RCU)
1226 {
1227 .procname = "panic_on_rcu_stall",
1228 .data = &sysctl_panic_on_rcu_stall,
1229 .maxlen = sizeof(sysctl_panic_on_rcu_stall),
1230 .mode = 0644,
1231 .proc_handler = proc_dointvec_minmax,
1232 .extra1 = &zero,
1233 .extra2 = &one,
1234 },
1235 #endif
1236 { }
1237 };
1238
1239 static struct ctl_table vm_table[] = {
1240 {
1241 .procname = "overcommit_memory",
1242 .data = &sysctl_overcommit_memory,
1243 .maxlen = sizeof(sysctl_overcommit_memory),
1244 .mode = 0644,
1245 .proc_handler = proc_dointvec_minmax,
1246 .extra1 = &zero,
1247 .extra2 = &two,
1248 },
1249 {
1250 .procname = "panic_on_oom",
1251 .data = &sysctl_panic_on_oom,
1252 .maxlen = sizeof(sysctl_panic_on_oom),
1253 .mode = 0644,
1254 .proc_handler = proc_dointvec_minmax,
1255 .extra1 = &zero,
1256 .extra2 = &two,
1257 },
1258 {
1259 .procname = "oom_kill_allocating_task",
1260 .data = &sysctl_oom_kill_allocating_task,
1261 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1262 .mode = 0644,
1263 .proc_handler = proc_dointvec,
1264 },
1265 {
1266 .procname = "oom_dump_tasks",
1267 .data = &sysctl_oom_dump_tasks,
1268 .maxlen = sizeof(sysctl_oom_dump_tasks),
1269 .mode = 0644,
1270 .proc_handler = proc_dointvec,
1271 },
1272 {
1273 .procname = "overcommit_ratio",
1274 .data = &sysctl_overcommit_ratio,
1275 .maxlen = sizeof(sysctl_overcommit_ratio),
1276 .mode = 0644,
1277 .proc_handler = overcommit_ratio_handler,
1278 },
1279 {
1280 .procname = "overcommit_kbytes",
1281 .data = &sysctl_overcommit_kbytes,
1282 .maxlen = sizeof(sysctl_overcommit_kbytes),
1283 .mode = 0644,
1284 .proc_handler = overcommit_kbytes_handler,
1285 },
1286 {
1287 .procname = "page-cluster",
1288 .data = &page_cluster,
1289 .maxlen = sizeof(int),
1290 .mode = 0644,
1291 .proc_handler = proc_dointvec_minmax,
1292 .extra1 = &zero,
1293 },
1294 {
1295 .procname = "dirty_background_ratio",
1296 .data = &dirty_background_ratio,
1297 .maxlen = sizeof(dirty_background_ratio),
1298 .mode = 0644,
1299 .proc_handler = dirty_background_ratio_handler,
1300 .extra1 = &zero,
1301 .extra2 = &one_hundred,
1302 },
1303 {
1304 .procname = "dirty_background_bytes",
1305 .data = &dirty_background_bytes,
1306 .maxlen = sizeof(dirty_background_bytes),
1307 .mode = 0644,
1308 .proc_handler = dirty_background_bytes_handler,
1309 .extra1 = &one_ul,
1310 },
1311 {
1312 .procname = "dirty_ratio",
1313 .data = &vm_dirty_ratio,
1314 .maxlen = sizeof(vm_dirty_ratio),
1315 .mode = 0644,
1316 .proc_handler = dirty_ratio_handler,
1317 .extra1 = &zero,
1318 .extra2 = &one_hundred,
1319 },
1320 {
1321 .procname = "dirty_bytes",
1322 .data = &vm_dirty_bytes,
1323 .maxlen = sizeof(vm_dirty_bytes),
1324 .mode = 0644,
1325 .proc_handler = dirty_bytes_handler,
1326 .extra1 = &dirty_bytes_min,
1327 },
1328 {
1329 .procname = "dirty_writeback_centisecs",
1330 .data = &dirty_writeback_interval,
1331 .maxlen = sizeof(dirty_writeback_interval),
1332 .mode = 0644,
1333 .proc_handler = dirty_writeback_centisecs_handler,
1334 },
1335 {
1336 .procname = "dirty_expire_centisecs",
1337 .data = &dirty_expire_interval,
1338 .maxlen = sizeof(dirty_expire_interval),
1339 .mode = 0644,
1340 .proc_handler = proc_dointvec_minmax,
1341 .extra1 = &zero,
1342 },
1343 {
1344 .procname = "dirtytime_expire_seconds",
1345 .data = &dirtytime_expire_interval,
1346 .maxlen = sizeof(dirtytime_expire_interval),
1347 .mode = 0644,
1348 .proc_handler = dirtytime_interval_handler,
1349 .extra1 = &zero,
1350 },
1351 {
1352 .procname = "swappiness",
1353 .data = &vm_swappiness,
1354 .maxlen = sizeof(vm_swappiness),
1355 .mode = 0644,
1356 .proc_handler = proc_dointvec_minmax,
1357 .extra1 = &zero,
1358 .extra2 = &one_hundred,
1359 },
1360 #ifdef CONFIG_HUGETLB_PAGE
1361 {
1362 .procname = "nr_hugepages",
1363 .data = NULL,
1364 .maxlen = sizeof(unsigned long),
1365 .mode = 0644,
1366 .proc_handler = hugetlb_sysctl_handler,
1367 },
1368 #ifdef CONFIG_NUMA
1369 {
1370 .procname = "nr_hugepages_mempolicy",
1371 .data = NULL,
1372 .maxlen = sizeof(unsigned long),
1373 .mode = 0644,
1374 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
1375 },
1376 {
1377 .procname = "numa_stat",
1378 .data = &sysctl_vm_numa_stat,
1379 .maxlen = sizeof(int),
1380 .mode = 0644,
1381 .proc_handler = sysctl_vm_numa_stat_handler,
1382 .extra1 = &zero,
1383 .extra2 = &one,
1384 },
1385 #endif
1386 {
1387 .procname = "hugetlb_shm_group",
1388 .data = &sysctl_hugetlb_shm_group,
1389 .maxlen = sizeof(gid_t),
1390 .mode = 0644,
1391 .proc_handler = proc_dointvec,
1392 },
1393 {
1394 .procname = "nr_overcommit_hugepages",
1395 .data = NULL,
1396 .maxlen = sizeof(unsigned long),
1397 .mode = 0644,
1398 .proc_handler = hugetlb_overcommit_handler,
1399 },
1400 #endif
1401 {
1402 .procname = "lowmem_reserve_ratio",
1403 .data = &sysctl_lowmem_reserve_ratio,
1404 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1405 .mode = 0644,
1406 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
1407 },
1408 {
1409 .procname = "drop_caches",
1410 .data = &sysctl_drop_caches,
1411 .maxlen = sizeof(int),
1412 .mode = 0644,
1413 .proc_handler = drop_caches_sysctl_handler,
1414 .extra1 = &one,
1415 .extra2 = &four,
1416 },
1417 #ifdef CONFIG_COMPACTION
1418 {
1419 .procname = "compact_memory",
1420 .data = &sysctl_compact_memory,
1421 .maxlen = sizeof(int),
1422 .mode = 0200,
1423 .proc_handler = sysctl_compaction_handler,
1424 },
1425 {
1426 .procname = "extfrag_threshold",
1427 .data = &sysctl_extfrag_threshold,
1428 .maxlen = sizeof(int),
1429 .mode = 0644,
1430 .proc_handler = sysctl_extfrag_handler,
1431 .extra1 = &min_extfrag_threshold,
1432 .extra2 = &max_extfrag_threshold,
1433 },
1434 {
1435 .procname = "compact_unevictable_allowed",
1436 .data = &sysctl_compact_unevictable_allowed,
1437 .maxlen = sizeof(int),
1438 .mode = 0644,
1439 .proc_handler = proc_dointvec,
1440 .extra1 = &zero,
1441 .extra2 = &one,
1442 },
1443
1444 #endif /* CONFIG_COMPACTION */
1445 {
1446 .procname = "min_free_kbytes",
1447 .data = &min_free_kbytes,
1448 .maxlen = sizeof(min_free_kbytes),
1449 .mode = 0644,
1450 .proc_handler = min_free_kbytes_sysctl_handler,
1451 .extra1 = &zero,
1452 },
1453 {
1454 .procname = "watermark_scale_factor",
1455 .data = &watermark_scale_factor,
1456 .maxlen = sizeof(watermark_scale_factor),
1457 .mode = 0644,
1458 .proc_handler = watermark_scale_factor_sysctl_handler,
1459 .extra1 = &one,
1460 .extra2 = &one_thousand,
1461 },
1462 {
1463 .procname = "percpu_pagelist_fraction",
1464 .data = &percpu_pagelist_fraction,
1465 .maxlen = sizeof(percpu_pagelist_fraction),
1466 .mode = 0644,
1467 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
1468 .extra1 = &zero,
1469 },
1470 #ifdef CONFIG_MMU
1471 {
1472 .procname = "max_map_count",
1473 .data = &sysctl_max_map_count,
1474 .maxlen = sizeof(sysctl_max_map_count),
1475 .mode = 0644,
1476 .proc_handler = proc_dointvec_minmax,
1477 .extra1 = &zero,
1478 },
1479 #else
1480 {
1481 .procname = "nr_trim_pages",
1482 .data = &sysctl_nr_trim_pages,
1483 .maxlen = sizeof(sysctl_nr_trim_pages),
1484 .mode = 0644,
1485 .proc_handler = proc_dointvec_minmax,
1486 .extra1 = &zero,
1487 },
1488 #endif
1489 {
1490 .procname = "laptop_mode",
1491 .data = &laptop_mode,
1492 .maxlen = sizeof(laptop_mode),
1493 .mode = 0644,
1494 .proc_handler = proc_dointvec_jiffies,
1495 },
1496 {
1497 .procname = "block_dump",
1498 .data = &block_dump,
1499 .maxlen = sizeof(block_dump),
1500 .mode = 0644,
1501 .proc_handler = proc_dointvec,
1502 .extra1 = &zero,
1503 },
1504 {
1505 .procname = "vfs_cache_pressure",
1506 .data = &sysctl_vfs_cache_pressure,
1507 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1508 .mode = 0644,
1509 .proc_handler = proc_dointvec,
1510 .extra1 = &zero,
1511 },
1512 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1513 {
1514 .procname = "legacy_va_layout",
1515 .data = &sysctl_legacy_va_layout,
1516 .maxlen = sizeof(sysctl_legacy_va_layout),
1517 .mode = 0644,
1518 .proc_handler = proc_dointvec,
1519 .extra1 = &zero,
1520 },
1521 #endif
1522 #ifdef CONFIG_NUMA
1523 {
1524 .procname = "zone_reclaim_mode",
1525 .data = &node_reclaim_mode,
1526 .maxlen = sizeof(node_reclaim_mode),
1527 .mode = 0644,
1528 .proc_handler = proc_dointvec,
1529 .extra1 = &zero,
1530 },
1531 {
1532 .procname = "min_unmapped_ratio",
1533 .data = &sysctl_min_unmapped_ratio,
1534 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1535 .mode = 0644,
1536 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
1537 .extra1 = &zero,
1538 .extra2 = &one_hundred,
1539 },
1540 {
1541 .procname = "min_slab_ratio",
1542 .data = &sysctl_min_slab_ratio,
1543 .maxlen = sizeof(sysctl_min_slab_ratio),
1544 .mode = 0644,
1545 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
1546 .extra1 = &zero,
1547 .extra2 = &one_hundred,
1548 },
1549 #endif
1550 #ifdef CONFIG_SMP
1551 {
1552 .procname = "stat_interval",
1553 .data = &sysctl_stat_interval,
1554 .maxlen = sizeof(sysctl_stat_interval),
1555 .mode = 0644,
1556 .proc_handler = proc_dointvec_jiffies,
1557 },
1558 {
1559 .procname = "stat_refresh",
1560 .data = NULL,
1561 .maxlen = 0,
1562 .mode = 0600,
1563 .proc_handler = vmstat_refresh,
1564 },
1565 #endif
1566 #ifdef CONFIG_MMU
1567 {
1568 .procname = "mmap_min_addr",
1569 .data = &dac_mmap_min_addr,
1570 .maxlen = sizeof(unsigned long),
1571 .mode = 0644,
1572 .proc_handler = mmap_min_addr_handler,
1573 },
1574 #endif
1575 #ifdef CONFIG_NUMA
1576 {
1577 .procname = "numa_zonelist_order",
1578 .data = &numa_zonelist_order,
1579 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1580 .mode = 0644,
1581 .proc_handler = numa_zonelist_order_handler,
1582 },
1583 #endif
1584 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1585 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1586 {
1587 .procname = "vdso_enabled",
1588 #ifdef CONFIG_X86_32
1589 .data = &vdso32_enabled,
1590 .maxlen = sizeof(vdso32_enabled),
1591 #else
1592 .data = &vdso_enabled,
1593 .maxlen = sizeof(vdso_enabled),
1594 #endif
1595 .mode = 0644,
1596 .proc_handler = proc_dointvec,
1597 .extra1 = &zero,
1598 },
1599 #endif
1600 #ifdef CONFIG_HIGHMEM
1601 {
1602 .procname = "highmem_is_dirtyable",
1603 .data = &vm_highmem_is_dirtyable,
1604 .maxlen = sizeof(vm_highmem_is_dirtyable),
1605 .mode = 0644,
1606 .proc_handler = proc_dointvec_minmax,
1607 .extra1 = &zero,
1608 .extra2 = &one,
1609 },
1610 #endif
1611 #ifdef CONFIG_MEMORY_FAILURE
1612 {
1613 .procname = "memory_failure_early_kill",
1614 .data = &sysctl_memory_failure_early_kill,
1615 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1616 .mode = 0644,
1617 .proc_handler = proc_dointvec_minmax,
1618 .extra1 = &zero,
1619 .extra2 = &one,
1620 },
1621 {
1622 .procname = "memory_failure_recovery",
1623 .data = &sysctl_memory_failure_recovery,
1624 .maxlen = sizeof(sysctl_memory_failure_recovery),
1625 .mode = 0644,
1626 .proc_handler = proc_dointvec_minmax,
1627 .extra1 = &zero,
1628 .extra2 = &one,
1629 },
1630 #endif
1631 {
1632 .procname = "user_reserve_kbytes",
1633 .data = &sysctl_user_reserve_kbytes,
1634 .maxlen = sizeof(sysctl_user_reserve_kbytes),
1635 .mode = 0644,
1636 .proc_handler = proc_doulongvec_minmax,
1637 },
1638 {
1639 .procname = "admin_reserve_kbytes",
1640 .data = &sysctl_admin_reserve_kbytes,
1641 .maxlen = sizeof(sysctl_admin_reserve_kbytes),
1642 .mode = 0644,
1643 .proc_handler = proc_doulongvec_minmax,
1644 },
1645 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS
1646 {
1647 .procname = "mmap_rnd_bits",
1648 .data = &mmap_rnd_bits,
1649 .maxlen = sizeof(mmap_rnd_bits),
1650 .mode = 0600,
1651 .proc_handler = proc_dointvec_minmax,
1652 .extra1 = (void *)&mmap_rnd_bits_min,
1653 .extra2 = (void *)&mmap_rnd_bits_max,
1654 },
1655 #endif
1656 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS
1657 {
1658 .procname = "mmap_rnd_compat_bits",
1659 .data = &mmap_rnd_compat_bits,
1660 .maxlen = sizeof(mmap_rnd_compat_bits),
1661 .mode = 0600,
1662 .proc_handler = proc_dointvec_minmax,
1663 .extra1 = (void *)&mmap_rnd_compat_bits_min,
1664 .extra2 = (void *)&mmap_rnd_compat_bits_max,
1665 },
1666 #endif
1667 { }
1668 };
1669
1670 static struct ctl_table fs_table[] = {
1671 {
1672 .procname = "inode-nr",
1673 .data = &inodes_stat,
1674 .maxlen = 2*sizeof(long),
1675 .mode = 0444,
1676 .proc_handler = proc_nr_inodes,
1677 },
1678 {
1679 .procname = "inode-state",
1680 .data = &inodes_stat,
1681 .maxlen = 7*sizeof(long),
1682 .mode = 0444,
1683 .proc_handler = proc_nr_inodes,
1684 },
1685 {
1686 .procname = "file-nr",
1687 .data = &files_stat,
1688 .maxlen = sizeof(files_stat),
1689 .mode = 0444,
1690 .proc_handler = proc_nr_files,
1691 },
1692 {
1693 .procname = "file-max",
1694 .data = &files_stat.max_files,
1695 .maxlen = sizeof(files_stat.max_files),
1696 .mode = 0644,
1697 .proc_handler = proc_doulongvec_minmax,
1698 },
1699 {
1700 .procname = "nr_open",
1701 .data = &sysctl_nr_open,
1702 .maxlen = sizeof(unsigned int),
1703 .mode = 0644,
1704 .proc_handler = proc_dointvec_minmax,
1705 .extra1 = &sysctl_nr_open_min,
1706 .extra2 = &sysctl_nr_open_max,
1707 },
1708 {
1709 .procname = "dentry-state",
1710 .data = &dentry_stat,
1711 .maxlen = 6*sizeof(long),
1712 .mode = 0444,
1713 .proc_handler = proc_nr_dentry,
1714 },
1715 {
1716 .procname = "overflowuid",
1717 .data = &fs_overflowuid,
1718 .maxlen = sizeof(int),
1719 .mode = 0644,
1720 .proc_handler = proc_dointvec_minmax,
1721 .extra1 = &minolduid,
1722 .extra2 = &maxolduid,
1723 },
1724 {
1725 .procname = "overflowgid",
1726 .data = &fs_overflowgid,
1727 .maxlen = sizeof(int),
1728 .mode = 0644,
1729 .proc_handler = proc_dointvec_minmax,
1730 .extra1 = &minolduid,
1731 .extra2 = &maxolduid,
1732 },
1733 #ifdef CONFIG_FILE_LOCKING
1734 {
1735 .procname = "leases-enable",
1736 .data = &leases_enable,
1737 .maxlen = sizeof(int),
1738 .mode = 0644,
1739 .proc_handler = proc_dointvec,
1740 },
1741 #endif
1742 #ifdef CONFIG_DNOTIFY
1743 {
1744 .procname = "dir-notify-enable",
1745 .data = &dir_notify_enable,
1746 .maxlen = sizeof(int),
1747 .mode = 0644,
1748 .proc_handler = proc_dointvec,
1749 },
1750 #endif
1751 #ifdef CONFIG_MMU
1752 #ifdef CONFIG_FILE_LOCKING
1753 {
1754 .procname = "lease-break-time",
1755 .data = &lease_break_time,
1756 .maxlen = sizeof(int),
1757 .mode = 0644,
1758 .proc_handler = proc_dointvec,
1759 },
1760 #endif
1761 #ifdef CONFIG_AIO
1762 {
1763 .procname = "aio-nr",
1764 .data = &aio_nr,
1765 .maxlen = sizeof(aio_nr),
1766 .mode = 0444,
1767 .proc_handler = proc_doulongvec_minmax,
1768 },
1769 {
1770 .procname = "aio-max-nr",
1771 .data = &aio_max_nr,
1772 .maxlen = sizeof(aio_max_nr),
1773 .mode = 0644,
1774 .proc_handler = proc_doulongvec_minmax,
1775 },
1776 #endif /* CONFIG_AIO */
1777 #ifdef CONFIG_INOTIFY_USER
1778 {
1779 .procname = "inotify",
1780 .mode = 0555,
1781 .child = inotify_table,
1782 },
1783 #endif
1784 #ifdef CONFIG_EPOLL
1785 {
1786 .procname = "epoll",
1787 .mode = 0555,
1788 .child = epoll_table,
1789 },
1790 #endif
1791 #endif
1792 {
1793 .procname = "protected_symlinks",
1794 .data = &sysctl_protected_symlinks,
1795 .maxlen = sizeof(int),
1796 .mode = 0600,
1797 .proc_handler = proc_dointvec_minmax,
1798 .extra1 = &zero,
1799 .extra2 = &one,
1800 },
1801 {
1802 .procname = "protected_hardlinks",
1803 .data = &sysctl_protected_hardlinks,
1804 .maxlen = sizeof(int),
1805 .mode = 0600,
1806 .proc_handler = proc_dointvec_minmax,
1807 .extra1 = &zero,
1808 .extra2 = &one,
1809 },
1810 {
1811 .procname = "protected_fifos",
1812 .data = &sysctl_protected_fifos,
1813 .maxlen = sizeof(int),
1814 .mode = 0600,
1815 .proc_handler = proc_dointvec_minmax,
1816 .extra1 = &zero,
1817 .extra2 = &two,
1818 },
1819 {
1820 .procname = "protected_regular",
1821 .data = &sysctl_protected_regular,
1822 .maxlen = sizeof(int),
1823 .mode = 0600,
1824 .proc_handler = proc_dointvec_minmax,
1825 .extra1 = &zero,
1826 .extra2 = &two,
1827 },
1828 {
1829 .procname = "suid_dumpable",
1830 .data = &suid_dumpable,
1831 .maxlen = sizeof(int),
1832 .mode = 0644,
1833 .proc_handler = proc_dointvec_minmax_coredump,
1834 .extra1 = &zero,
1835 .extra2 = &two,
1836 },
1837 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1838 {
1839 .procname = "binfmt_misc",
1840 .mode = 0555,
1841 .child = sysctl_mount_point,
1842 },
1843 #endif
1844 {
1845 .procname = "pipe-max-size",
1846 .data = &pipe_max_size,
1847 .maxlen = sizeof(pipe_max_size),
1848 .mode = 0644,
1849 .proc_handler = proc_dopipe_max_size,
1850 },
1851 {
1852 .procname = "pipe-user-pages-hard",
1853 .data = &pipe_user_pages_hard,
1854 .maxlen = sizeof(pipe_user_pages_hard),
1855 .mode = 0644,
1856 .proc_handler = proc_doulongvec_minmax,
1857 },
1858 {
1859 .procname = "pipe-user-pages-soft",
1860 .data = &pipe_user_pages_soft,
1861 .maxlen = sizeof(pipe_user_pages_soft),
1862 .mode = 0644,
1863 .proc_handler = proc_doulongvec_minmax,
1864 },
1865 {
1866 .procname = "mount-max",
1867 .data = &sysctl_mount_max,
1868 .maxlen = sizeof(unsigned int),
1869 .mode = 0644,
1870 .proc_handler = proc_dointvec_minmax,
1871 .extra1 = &one,
1872 },
1873 { }
1874 };
1875
1876 static struct ctl_table debug_table[] = {
1877 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1878 {
1879 .procname = "exception-trace",
1880 .data = &show_unhandled_signals,
1881 .maxlen = sizeof(int),
1882 .mode = 0644,
1883 .proc_handler = proc_dointvec
1884 },
1885 #endif
1886 #if defined(CONFIG_OPTPROBES)
1887 {
1888 .procname = "kprobes-optimization",
1889 .data = &sysctl_kprobes_optimization,
1890 .maxlen = sizeof(int),
1891 .mode = 0644,
1892 .proc_handler = proc_kprobes_optimization_handler,
1893 .extra1 = &zero,
1894 .extra2 = &one,
1895 },
1896 #endif
1897 { }
1898 };
1899
1900 static struct ctl_table dev_table[] = {
1901 { }
1902 };
1903
1904 int __init sysctl_init(void)
1905 {
1906 struct ctl_table_header *hdr;
1907
1908 hdr = register_sysctl_table(sysctl_base_table);
1909 kmemleak_not_leak(hdr);
1910 return 0;
1911 }
1912
1913 #endif /* CONFIG_SYSCTL */
1914
1915 /*
1916 * /proc/sys support
1917 */
1918
1919 #ifdef CONFIG_PROC_SYSCTL
1920
1921 static int _proc_do_string(char *data, int maxlen, int write,
1922 char __user *buffer,
1923 size_t *lenp, loff_t *ppos)
1924 {
1925 size_t len;
1926 char __user *p;
1927 char c;
1928
1929 if (!data || !maxlen || !*lenp) {
1930 *lenp = 0;
1931 return 0;
1932 }
1933
1934 if (write) {
1935 if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) {
1936 /* Only continue writes not past the end of buffer. */
1937 len = strlen(data);
1938 if (len > maxlen - 1)
1939 len = maxlen - 1;
1940
1941 if (*ppos > len)
1942 return 0;
1943 len = *ppos;
1944 } else {
1945 /* Start writing from beginning of buffer. */
1946 len = 0;
1947 }
1948
1949 *ppos += *lenp;
1950 p = buffer;
1951 while ((p - buffer) < *lenp && len < maxlen - 1) {
1952 if (get_user(c, p++))
1953 return -EFAULT;
1954 if (c == 0 || c == '\n')
1955 break;
1956 data[len++] = c;
1957 }
1958 data[len] = 0;
1959 } else {
1960 len = strlen(data);
1961 if (len > maxlen)
1962 len = maxlen;
1963
1964 if (*ppos > len) {
1965 *lenp = 0;
1966 return 0;
1967 }
1968
1969 data += *ppos;
1970 len -= *ppos;
1971
1972 if (len > *lenp)
1973 len = *lenp;
1974 if (len)
1975 if (copy_to_user(buffer, data, len))
1976 return -EFAULT;
1977 if (len < *lenp) {
1978 if (put_user('\n', buffer + len))
1979 return -EFAULT;
1980 len++;
1981 }
1982 *lenp = len;
1983 *ppos += len;
1984 }
1985 return 0;
1986 }
1987
1988 static void warn_sysctl_write(struct ctl_table *table)
1989 {
1990 pr_warn_once("%s wrote to %s when file position was not 0!\n"
1991 "This will not be supported in the future. To silence this\n"
1992 "warning, set kernel.sysctl_writes_strict = -1\n",
1993 current->comm, table->procname);
1994 }
1995
1996 /**
1997 * proc_first_pos_non_zero_ignore - check if first position is allowed
1998 * @ppos: file position
1999 * @table: the sysctl table
2000 *
2001 * Returns true if the first position is non-zero and the sysctl_writes_strict
2002 * mode indicates this is not allowed for numeric input types. String proc
2003 * handlers can ignore the return value.
2004 */
2005 static bool proc_first_pos_non_zero_ignore(loff_t *ppos,
2006 struct ctl_table *table)
2007 {
2008 if (!*ppos)
2009 return false;
2010
2011 switch (sysctl_writes_strict) {
2012 case SYSCTL_WRITES_STRICT:
2013 return true;
2014 case SYSCTL_WRITES_WARN:
2015 warn_sysctl_write(table);
2016 return false;
2017 default:
2018 return false;
2019 }
2020 }
2021
2022 /**
2023 * proc_dostring - read a string sysctl
2024 * @table: the sysctl table
2025 * @write: %TRUE if this is a write to the sysctl file
2026 * @buffer: the user buffer
2027 * @lenp: the size of the user buffer
2028 * @ppos: file position
2029 *
2030 * Reads/writes a string from/to the user buffer. If the kernel
2031 * buffer provided is not large enough to hold the string, the
2032 * string is truncated. The copied string is %NULL-terminated.
2033 * If the string is being read by the user process, it is copied
2034 * and a newline '\n' is added. It is truncated if the buffer is
2035 * not large enough.
2036 *
2037 * Returns 0 on success.
2038 */
2039 int proc_dostring(struct ctl_table *table, int write,
2040 void __user *buffer, size_t *lenp, loff_t *ppos)
2041 {
2042 if (write)
2043 proc_first_pos_non_zero_ignore(ppos, table);
2044
2045 return _proc_do_string((char *)(table->data), table->maxlen, write,
2046 (char __user *)buffer, lenp, ppos);
2047 }
2048
2049 static size_t proc_skip_spaces(char **buf)
2050 {
2051 size_t ret;
2052 char *tmp = skip_spaces(*buf);
2053 ret = tmp - *buf;
2054 *buf = tmp;
2055 return ret;
2056 }
2057
2058 static void proc_skip_char(char **buf, size_t *size, const char v)
2059 {
2060 while (*size) {
2061 if (**buf != v)
2062 break;
2063 (*size)--;
2064 (*buf)++;
2065 }
2066 }
2067
2068 #define TMPBUFLEN 22
2069 /**
2070 * proc_get_long - reads an ASCII formatted integer from a user buffer
2071 *
2072 * @buf: a kernel buffer
2073 * @size: size of the kernel buffer
2074 * @val: this is where the number will be stored
2075 * @neg: set to %TRUE if number is negative
2076 * @perm_tr: a vector which contains the allowed trailers
2077 * @perm_tr_len: size of the perm_tr vector
2078 * @tr: pointer to store the trailer character
2079 *
2080 * In case of success %0 is returned and @buf and @size are updated with
2081 * the amount of bytes read. If @tr is non-NULL and a trailing
2082 * character exists (size is non-zero after returning from this
2083 * function), @tr is updated with the trailing character.
2084 */
2085 static int proc_get_long(char **buf, size_t *size,
2086 unsigned long *val, bool *neg,
2087 const char *perm_tr, unsigned perm_tr_len, char *tr)
2088 {
2089 int len;
2090 char *p, tmp[TMPBUFLEN];
2091
2092 if (!*size)
2093 return -EINVAL;
2094
2095 len = *size;
2096 if (len > TMPBUFLEN - 1)
2097 len = TMPBUFLEN - 1;
2098
2099 memcpy(tmp, *buf, len);
2100
2101 tmp[len] = 0;
2102 p = tmp;
2103 if (*p == '-' && *size > 1) {
2104 *neg = true;
2105 p++;
2106 } else
2107 *neg = false;
2108 if (!isdigit(*p))
2109 return -EINVAL;
2110
2111 *val = simple_strtoul(p, &p, 0);
2112
2113 len = p - tmp;
2114
2115 /* We don't know if the next char is whitespace thus we may accept
2116 * invalid integers (e.g. 1234...a) or two integers instead of one
2117 * (e.g. 123...1). So lets not allow such large numbers. */
2118 if (len == TMPBUFLEN - 1)
2119 return -EINVAL;
2120
2121 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
2122 return -EINVAL;
2123
2124 if (tr && (len < *size))
2125 *tr = *p;
2126
2127 *buf += len;
2128 *size -= len;
2129
2130 return 0;
2131 }
2132
2133 /**
2134 * proc_put_long - converts an integer to a decimal ASCII formatted string
2135 *
2136 * @buf: the user buffer
2137 * @size: the size of the user buffer
2138 * @val: the integer to be converted
2139 * @neg: sign of the number, %TRUE for negative
2140 *
2141 * In case of success %0 is returned and @buf and @size are updated with
2142 * the amount of bytes written.
2143 */
2144 static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
2145 bool neg)
2146 {
2147 int len;
2148 char tmp[TMPBUFLEN], *p = tmp;
2149
2150 sprintf(p, "%s%lu", neg ? "-" : "", val);
2151 len = strlen(tmp);
2152 if (len > *size)
2153 len = *size;
2154 if (copy_to_user(*buf, tmp, len))
2155 return -EFAULT;
2156 *size -= len;
2157 *buf += len;
2158 return 0;
2159 }
2160 #undef TMPBUFLEN
2161
2162 static int proc_put_char(void __user **buf, size_t *size, char c)
2163 {
2164 if (*size) {
2165 char __user **buffer = (char __user **)buf;
2166 if (put_user(c, *buffer))
2167 return -EFAULT;
2168 (*size)--, (*buffer)++;
2169 *buf = *buffer;
2170 }
2171 return 0;
2172 }
2173
2174 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
2175 int *valp,
2176 int write, void *data)
2177 {
2178 if (write) {
2179 if (*negp) {
2180 if (*lvalp > (unsigned long) INT_MAX + 1)
2181 return -EINVAL;
2182 *valp = -*lvalp;
2183 } else {
2184 if (*lvalp > (unsigned long) INT_MAX)
2185 return -EINVAL;
2186 *valp = *lvalp;
2187 }
2188 } else {
2189 int val = *valp;
2190 if (val < 0) {
2191 *negp = true;
2192 *lvalp = -(unsigned long)val;
2193 } else {
2194 *negp = false;
2195 *lvalp = (unsigned long)val;
2196 }
2197 }
2198 return 0;
2199 }
2200
2201 static int do_proc_douintvec_conv(unsigned long *lvalp,
2202 unsigned int *valp,
2203 int write, void *data)
2204 {
2205 if (write) {
2206 if (*lvalp > UINT_MAX)
2207 return -EINVAL;
2208 *valp = *lvalp;
2209 } else {
2210 unsigned int val = *valp;
2211 *lvalp = (unsigned long)val;
2212 }
2213 return 0;
2214 }
2215
2216 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
2217
2218 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
2219 int write, void __user *buffer,
2220 size_t *lenp, loff_t *ppos,
2221 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2222 int write, void *data),
2223 void *data)
2224 {
2225 int *i, vleft, first = 1, err = 0;
2226 size_t left;
2227 char *kbuf = NULL, *p;
2228
2229 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
2230 *lenp = 0;
2231 return 0;
2232 }
2233
2234 i = (int *) tbl_data;
2235 vleft = table->maxlen / sizeof(*i);
2236 left = *lenp;
2237
2238 if (!conv)
2239 conv = do_proc_dointvec_conv;
2240
2241 if (write) {
2242 if (proc_first_pos_non_zero_ignore(ppos, table))
2243 goto out;
2244
2245 if (left > PAGE_SIZE - 1)
2246 left = PAGE_SIZE - 1;
2247 p = kbuf = memdup_user_nul(buffer, left);
2248 if (IS_ERR(kbuf))
2249 return PTR_ERR(kbuf);
2250 }
2251
2252 for (; left && vleft--; i++, first=0) {
2253 unsigned long lval;
2254 bool neg;
2255
2256 if (write) {
2257 left -= proc_skip_spaces(&p);
2258
2259 if (!left)
2260 break;
2261 err = proc_get_long(&p, &left, &lval, &neg,
2262 proc_wspace_sep,
2263 sizeof(proc_wspace_sep), NULL);
2264 if (err)
2265 break;
2266 if (conv(&neg, &lval, i, 1, data)) {
2267 err = -EINVAL;
2268 break;
2269 }
2270 } else {
2271 if (conv(&neg, &lval, i, 0, data)) {
2272 err = -EINVAL;
2273 break;
2274 }
2275 if (!first)
2276 err = proc_put_char(&buffer, &left, '\t');
2277 if (err)
2278 break;
2279 err = proc_put_long(&buffer, &left, lval, neg);
2280 if (err)
2281 break;
2282 }
2283 }
2284
2285 if (!write && !first && left && !err)
2286 err = proc_put_char(&buffer, &left, '\n');
2287 if (write && !err && left)
2288 left -= proc_skip_spaces(&p);
2289 if (write) {
2290 kfree(kbuf);
2291 if (first)
2292 return err ? : -EINVAL;
2293 }
2294 *lenp -= left;
2295 out:
2296 *ppos += *lenp;
2297 return err;
2298 }
2299
2300 static int do_proc_dointvec(struct ctl_table *table, int write,
2301 void __user *buffer, size_t *lenp, loff_t *ppos,
2302 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2303 int write, void *data),
2304 void *data)
2305 {
2306 return __do_proc_dointvec(table->data, table, write,
2307 buffer, lenp, ppos, conv, data);
2308 }
2309
2310 static int do_proc_douintvec_w(unsigned int *tbl_data,
2311 struct ctl_table *table,
2312 void __user *buffer,
2313 size_t *lenp, loff_t *ppos,
2314 int (*conv)(unsigned long *lvalp,
2315 unsigned int *valp,
2316 int write, void *data),
2317 void *data)
2318 {
2319 unsigned long lval;
2320 int err = 0;
2321 size_t left;
2322 bool neg;
2323 char *kbuf = NULL, *p;
2324
2325 left = *lenp;
2326
2327 if (proc_first_pos_non_zero_ignore(ppos, table))
2328 goto bail_early;
2329
2330 if (left > PAGE_SIZE - 1)
2331 left = PAGE_SIZE - 1;
2332
2333 p = kbuf = memdup_user_nul(buffer, left);
2334 if (IS_ERR(kbuf))
2335 return -EINVAL;
2336
2337 left -= proc_skip_spaces(&p);
2338 if (!left) {
2339 err = -EINVAL;
2340 goto out_free;
2341 }
2342
2343 err = proc_get_long(&p, &left, &lval, &neg,
2344 proc_wspace_sep,
2345 sizeof(proc_wspace_sep), NULL);
2346 if (err || neg) {
2347 err = -EINVAL;
2348 goto out_free;
2349 }
2350
2351 if (conv(&lval, tbl_data, 1, data)) {
2352 err = -EINVAL;
2353 goto out_free;
2354 }
2355
2356 if (!err && left)
2357 left -= proc_skip_spaces(&p);
2358
2359 out_free:
2360 kfree(kbuf);
2361 if (err)
2362 return -EINVAL;
2363
2364 return 0;
2365
2366 /* This is in keeping with old __do_proc_dointvec() */
2367 bail_early:
2368 *ppos += *lenp;
2369 return err;
2370 }
2371
2372 static int do_proc_douintvec_r(unsigned int *tbl_data, void __user *buffer,
2373 size_t *lenp, loff_t *ppos,
2374 int (*conv)(unsigned long *lvalp,
2375 unsigned int *valp,
2376 int write, void *data),
2377 void *data)
2378 {
2379 unsigned long lval;
2380 int err = 0;
2381 size_t left;
2382
2383 left = *lenp;
2384
2385 if (conv(&lval, tbl_data, 0, data)) {
2386 err = -EINVAL;
2387 goto out;
2388 }
2389
2390 err = proc_put_long(&buffer, &left, lval, false);
2391 if (err || !left)
2392 goto out;
2393
2394 err = proc_put_char(&buffer, &left, '\n');
2395
2396 out:
2397 *lenp -= left;
2398 *ppos += *lenp;
2399
2400 return err;
2401 }
2402
2403 static int __do_proc_douintvec(void *tbl_data, struct ctl_table *table,
2404 int write, void __user *buffer,
2405 size_t *lenp, loff_t *ppos,
2406 int (*conv)(unsigned long *lvalp,
2407 unsigned int *valp,
2408 int write, void *data),
2409 void *data)
2410 {
2411 unsigned int *i, vleft;
2412
2413 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
2414 *lenp = 0;
2415 return 0;
2416 }
2417
2418 i = (unsigned int *) tbl_data;
2419 vleft = table->maxlen / sizeof(*i);
2420
2421 /*
2422 * Arrays are not supported, keep this simple. *Do not* add
2423 * support for them.
2424 */
2425 if (vleft != 1) {
2426 *lenp = 0;
2427 return -EINVAL;
2428 }
2429
2430 if (!conv)
2431 conv = do_proc_douintvec_conv;
2432
2433 if (write)
2434 return do_proc_douintvec_w(i, table, buffer, lenp, ppos,
2435 conv, data);
2436 return do_proc_douintvec_r(i, buffer, lenp, ppos, conv, data);
2437 }
2438
2439 static int do_proc_douintvec(struct ctl_table *table, int write,
2440 void __user *buffer, size_t *lenp, loff_t *ppos,
2441 int (*conv)(unsigned long *lvalp,
2442 unsigned int *valp,
2443 int write, void *data),
2444 void *data)
2445 {
2446 return __do_proc_douintvec(table->data, table, write,
2447 buffer, lenp, ppos, conv, data);
2448 }
2449
2450 /**
2451 * proc_dointvec - read a vector of integers
2452 * @table: the sysctl table
2453 * @write: %TRUE if this is a write to the sysctl file
2454 * @buffer: the user buffer
2455 * @lenp: the size of the user buffer
2456 * @ppos: file position
2457 *
2458 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2459 * values from/to the user buffer, treated as an ASCII string.
2460 *
2461 * Returns 0 on success.
2462 */
2463 int proc_dointvec(struct ctl_table *table, int write,
2464 void __user *buffer, size_t *lenp, loff_t *ppos)
2465 {
2466 return do_proc_dointvec(table, write, buffer, lenp, ppos, NULL, NULL);
2467 }
2468
2469 /**
2470 * proc_douintvec - read a vector of unsigned integers
2471 * @table: the sysctl table
2472 * @write: %TRUE if this is a write to the sysctl file
2473 * @buffer: the user buffer
2474 * @lenp: the size of the user buffer
2475 * @ppos: file position
2476 *
2477 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
2478 * values from/to the user buffer, treated as an ASCII string.
2479 *
2480 * Returns 0 on success.
2481 */
2482 int proc_douintvec(struct ctl_table *table, int write,
2483 void __user *buffer, size_t *lenp, loff_t *ppos)
2484 {
2485 return do_proc_douintvec(table, write, buffer, lenp, ppos,
2486 do_proc_douintvec_conv, NULL);
2487 }
2488
2489 /*
2490 * Taint values can only be increased
2491 * This means we can safely use a temporary.
2492 */
2493 static int proc_taint(struct ctl_table *table, int write,
2494 void __user *buffer, size_t *lenp, loff_t *ppos)
2495 {
2496 struct ctl_table t;
2497 unsigned long tmptaint = get_taint();
2498 int err;
2499
2500 if (write && !capable(CAP_SYS_ADMIN))
2501 return -EPERM;
2502
2503 t = *table;
2504 t.data = &tmptaint;
2505 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2506 if (err < 0)
2507 return err;
2508
2509 if (write) {
2510 /*
2511 * Poor man's atomic or. Not worth adding a primitive
2512 * to everyone's atomic.h for this
2513 */
2514 int i;
2515 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2516 if ((tmptaint >> i) & 1)
2517 add_taint(i, LOCKDEP_STILL_OK);
2518 }
2519 }
2520
2521 return err;
2522 }
2523
2524 #ifdef CONFIG_PRINTK
2525 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
2526 void __user *buffer, size_t *lenp, loff_t *ppos)
2527 {
2528 if (write && !capable(CAP_SYS_ADMIN))
2529 return -EPERM;
2530
2531 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2532 }
2533 #endif
2534
2535 /**
2536 * struct do_proc_dointvec_minmax_conv_param - proc_dointvec_minmax() range checking structure
2537 * @min: pointer to minimum allowable value
2538 * @max: pointer to maximum allowable value
2539 *
2540 * The do_proc_dointvec_minmax_conv_param structure provides the
2541 * minimum and maximum values for doing range checking for those sysctl
2542 * parameters that use the proc_dointvec_minmax() handler.
2543 */
2544 struct do_proc_dointvec_minmax_conv_param {
2545 int *min;
2546 int *max;
2547 };
2548
2549 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2550 int *valp,
2551 int write, void *data)
2552 {
2553 struct do_proc_dointvec_minmax_conv_param *param = data;
2554 if (write) {
2555 int val = *negp ? -*lvalp : *lvalp;
2556 if ((param->min && *param->min > val) ||
2557 (param->max && *param->max < val))
2558 return -EINVAL;
2559 *valp = val;
2560 } else {
2561 int val = *valp;
2562 if (val < 0) {
2563 *negp = true;
2564 *lvalp = -(unsigned long)val;
2565 } else {
2566 *negp = false;
2567 *lvalp = (unsigned long)val;
2568 }
2569 }
2570 return 0;
2571 }
2572
2573 /**
2574 * proc_dointvec_minmax - read a vector of integers with min/max values
2575 * @table: the sysctl table
2576 * @write: %TRUE if this is a write to the sysctl file
2577 * @buffer: the user buffer
2578 * @lenp: the size of the user buffer
2579 * @ppos: file position
2580 *
2581 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2582 * values from/to the user buffer, treated as an ASCII string.
2583 *
2584 * This routine will ensure the values are within the range specified by
2585 * table->extra1 (min) and table->extra2 (max).
2586 *
2587 * Returns 0 on success or -EINVAL on write when the range check fails.
2588 */
2589 int proc_dointvec_minmax(struct ctl_table *table, int write,
2590 void __user *buffer, size_t *lenp, loff_t *ppos)
2591 {
2592 struct do_proc_dointvec_minmax_conv_param param = {
2593 .min = (int *) table->extra1,
2594 .max = (int *) table->extra2,
2595 };
2596 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2597 do_proc_dointvec_minmax_conv, &param);
2598 }
2599
2600 /**
2601 * struct do_proc_douintvec_minmax_conv_param - proc_douintvec_minmax() range checking structure
2602 * @min: pointer to minimum allowable value
2603 * @max: pointer to maximum allowable value
2604 *
2605 * The do_proc_douintvec_minmax_conv_param structure provides the
2606 * minimum and maximum values for doing range checking for those sysctl
2607 * parameters that use the proc_douintvec_minmax() handler.
2608 */
2609 struct do_proc_douintvec_minmax_conv_param {
2610 unsigned int *min;
2611 unsigned int *max;
2612 };
2613
2614 static int do_proc_douintvec_minmax_conv(unsigned long *lvalp,
2615 unsigned int *valp,
2616 int write, void *data)
2617 {
2618 struct do_proc_douintvec_minmax_conv_param *param = data;
2619
2620 if (write) {
2621 unsigned int val = *lvalp;
2622
2623 if (*lvalp > UINT_MAX)
2624 return -EINVAL;
2625
2626 if ((param->min && *param->min > val) ||
2627 (param->max && *param->max < val))
2628 return -ERANGE;
2629
2630 *valp = val;
2631 } else {
2632 unsigned int val = *valp;
2633 *lvalp = (unsigned long) val;
2634 }
2635
2636 return 0;
2637 }
2638
2639 /**
2640 * proc_douintvec_minmax - read a vector of unsigned ints with min/max values
2641 * @table: the sysctl table
2642 * @write: %TRUE if this is a write to the sysctl file
2643 * @buffer: the user buffer
2644 * @lenp: the size of the user buffer
2645 * @ppos: file position
2646 *
2647 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
2648 * values from/to the user buffer, treated as an ASCII string. Negative
2649 * strings are not allowed.
2650 *
2651 * This routine will ensure the values are within the range specified by
2652 * table->extra1 (min) and table->extra2 (max). There is a final sanity
2653 * check for UINT_MAX to avoid having to support wrap around uses from
2654 * userspace.
2655 *
2656 * Returns 0 on success or -ERANGE on write when the range check fails.
2657 */
2658 int proc_douintvec_minmax(struct ctl_table *table, int write,
2659 void __user *buffer, size_t *lenp, loff_t *ppos)
2660 {
2661 struct do_proc_douintvec_minmax_conv_param param = {
2662 .min = (unsigned int *) table->extra1,
2663 .max = (unsigned int *) table->extra2,
2664 };
2665 return do_proc_douintvec(table, write, buffer, lenp, ppos,
2666 do_proc_douintvec_minmax_conv, &param);
2667 }
2668
2669 static int do_proc_dopipe_max_size_conv(unsigned long *lvalp,
2670 unsigned int *valp,
2671 int write, void *data)
2672 {
2673 if (write) {
2674 unsigned int val;
2675
2676 val = round_pipe_size(*lvalp);
2677 if (val == 0)
2678 return -EINVAL;
2679
2680 *valp = val;
2681 } else {
2682 unsigned int val = *valp;
2683 *lvalp = (unsigned long) val;
2684 }
2685
2686 return 0;
2687 }
2688
2689 static int proc_dopipe_max_size(struct ctl_table *table, int write,
2690 void __user *buffer, size_t *lenp, loff_t *ppos)
2691 {
2692 return do_proc_douintvec(table, write, buffer, lenp, ppos,
2693 do_proc_dopipe_max_size_conv, NULL);
2694 }
2695
2696 static void validate_coredump_safety(void)
2697 {
2698 #ifdef CONFIG_COREDUMP
2699 if (suid_dumpable == SUID_DUMP_ROOT &&
2700 core_pattern[0] != '/' && core_pattern[0] != '|') {
2701 printk(KERN_WARNING
2702 "Unsafe core_pattern used with fs.suid_dumpable=2.\n"
2703 "Pipe handler or fully qualified core dump path required.\n"
2704 "Set kernel.core_pattern before fs.suid_dumpable.\n"
2705 );
2706 }
2707 #endif
2708 }
2709
2710 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2711 void __user *buffer, size_t *lenp, loff_t *ppos)
2712 {
2713 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2714 if (!error)
2715 validate_coredump_safety();
2716 return error;
2717 }
2718
2719 #ifdef CONFIG_COREDUMP
2720 static int proc_dostring_coredump(struct ctl_table *table, int write,
2721 void __user *buffer, size_t *lenp, loff_t *ppos)
2722 {
2723 int error = proc_dostring(table, write, buffer, lenp, ppos);
2724 if (!error)
2725 validate_coredump_safety();
2726 return error;
2727 }
2728 #endif
2729
2730 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2731 void __user *buffer,
2732 size_t *lenp, loff_t *ppos,
2733 unsigned long convmul,
2734 unsigned long convdiv)
2735 {
2736 unsigned long *i, *min, *max;
2737 int vleft, first = 1, err = 0;
2738 size_t left;
2739 char *kbuf = NULL, *p;
2740
2741 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2742 *lenp = 0;
2743 return 0;
2744 }
2745
2746 i = (unsigned long *) data;
2747 min = (unsigned long *) table->extra1;
2748 max = (unsigned long *) table->extra2;
2749 vleft = table->maxlen / sizeof(unsigned long);
2750 left = *lenp;
2751
2752 if (write) {
2753 if (proc_first_pos_non_zero_ignore(ppos, table))
2754 goto out;
2755
2756 if (left > PAGE_SIZE - 1)
2757 left = PAGE_SIZE - 1;
2758 p = kbuf = memdup_user_nul(buffer, left);
2759 if (IS_ERR(kbuf))
2760 return PTR_ERR(kbuf);
2761 }
2762
2763 for (; left && vleft--; i++, first = 0) {
2764 unsigned long val;
2765
2766 if (write) {
2767 bool neg;
2768
2769 left -= proc_skip_spaces(&p);
2770
2771 err = proc_get_long(&p, &left, &val, &neg,
2772 proc_wspace_sep,
2773 sizeof(proc_wspace_sep), NULL);
2774 if (err)
2775 break;
2776 if (neg)
2777 continue;
2778 val = convmul * val / convdiv;
2779 if ((min && val < *min) || (max && val > *max))
2780 continue;
2781 *i = val;
2782 } else {
2783 val = convdiv * (*i) / convmul;
2784 if (!first) {
2785 err = proc_put_char(&buffer, &left, '\t');
2786 if (err)
2787 break;
2788 }
2789 err = proc_put_long(&buffer, &left, val, false);
2790 if (err)
2791 break;
2792 }
2793 }
2794
2795 if (!write && !first && left && !err)
2796 err = proc_put_char(&buffer, &left, '\n');
2797 if (write && !err)
2798 left -= proc_skip_spaces(&p);
2799 if (write) {
2800 kfree(kbuf);
2801 if (first)
2802 return err ? : -EINVAL;
2803 }
2804 *lenp -= left;
2805 out:
2806 *ppos += *lenp;
2807 return err;
2808 }
2809
2810 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2811 void __user *buffer,
2812 size_t *lenp, loff_t *ppos,
2813 unsigned long convmul,
2814 unsigned long convdiv)
2815 {
2816 return __do_proc_doulongvec_minmax(table->data, table, write,
2817 buffer, lenp, ppos, convmul, convdiv);
2818 }
2819
2820 /**
2821 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2822 * @table: the sysctl table
2823 * @write: %TRUE if this is a write to the sysctl file
2824 * @buffer: the user buffer
2825 * @lenp: the size of the user buffer
2826 * @ppos: file position
2827 *
2828 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2829 * values from/to the user buffer, treated as an ASCII string.
2830 *
2831 * This routine will ensure the values are within the range specified by
2832 * table->extra1 (min) and table->extra2 (max).
2833 *
2834 * Returns 0 on success.
2835 */
2836 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2837 void __user *buffer, size_t *lenp, loff_t *ppos)
2838 {
2839 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2840 }
2841
2842 /**
2843 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2844 * @table: the sysctl table
2845 * @write: %TRUE if this is a write to the sysctl file
2846 * @buffer: the user buffer
2847 * @lenp: the size of the user buffer
2848 * @ppos: file position
2849 *
2850 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2851 * values from/to the user buffer, treated as an ASCII string. The values
2852 * are treated as milliseconds, and converted to jiffies when they are stored.
2853 *
2854 * This routine will ensure the values are within the range specified by
2855 * table->extra1 (min) and table->extra2 (max).
2856 *
2857 * Returns 0 on success.
2858 */
2859 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2860 void __user *buffer,
2861 size_t *lenp, loff_t *ppos)
2862 {
2863 return do_proc_doulongvec_minmax(table, write, buffer,
2864 lenp, ppos, HZ, 1000l);
2865 }
2866
2867
2868 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2869 int *valp,
2870 int write, void *data)
2871 {
2872 if (write) {
2873 if (*lvalp > INT_MAX / HZ)
2874 return 1;
2875 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2876 } else {
2877 int val = *valp;
2878 unsigned long lval;
2879 if (val < 0) {
2880 *negp = true;
2881 lval = -(unsigned long)val;
2882 } else {
2883 *negp = false;
2884 lval = (unsigned long)val;
2885 }
2886 *lvalp = lval / HZ;
2887 }
2888 return 0;
2889 }
2890
2891 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2892 int *valp,
2893 int write, void *data)
2894 {
2895 if (write) {
2896 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2897 return 1;
2898 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2899 } else {
2900 int val = *valp;
2901 unsigned long lval;
2902 if (val < 0) {
2903 *negp = true;
2904 lval = -(unsigned long)val;
2905 } else {
2906 *negp = false;
2907 lval = (unsigned long)val;
2908 }
2909 *lvalp = jiffies_to_clock_t(lval);
2910 }
2911 return 0;
2912 }
2913
2914 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2915 int *valp,
2916 int write, void *data)
2917 {
2918 if (write) {
2919 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2920
2921 if (jif > INT_MAX)
2922 return 1;
2923 *valp = (int)jif;
2924 } else {
2925 int val = *valp;
2926 unsigned long lval;
2927 if (val < 0) {
2928 *negp = true;
2929 lval = -(unsigned long)val;
2930 } else {
2931 *negp = false;
2932 lval = (unsigned long)val;
2933 }
2934 *lvalp = jiffies_to_msecs(lval);
2935 }
2936 return 0;
2937 }
2938
2939 /**
2940 * proc_dointvec_jiffies - read a vector of integers as seconds
2941 * @table: the sysctl table
2942 * @write: %TRUE if this is a write to the sysctl file
2943 * @buffer: the user buffer
2944 * @lenp: the size of the user buffer
2945 * @ppos: file position
2946 *
2947 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2948 * values from/to the user buffer, treated as an ASCII string.
2949 * The values read are assumed to be in seconds, and are converted into
2950 * jiffies.
2951 *
2952 * Returns 0 on success.
2953 */
2954 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2955 void __user *buffer, size_t *lenp, loff_t *ppos)
2956 {
2957 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2958 do_proc_dointvec_jiffies_conv,NULL);
2959 }
2960
2961 /**
2962 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2963 * @table: the sysctl table
2964 * @write: %TRUE if this is a write to the sysctl file
2965 * @buffer: the user buffer
2966 * @lenp: the size of the user buffer
2967 * @ppos: pointer to the file position
2968 *
2969 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2970 * values from/to the user buffer, treated as an ASCII string.
2971 * The values read are assumed to be in 1/USER_HZ seconds, and
2972 * are converted into jiffies.
2973 *
2974 * Returns 0 on success.
2975 */
2976 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2977 void __user *buffer, size_t *lenp, loff_t *ppos)
2978 {
2979 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2980 do_proc_dointvec_userhz_jiffies_conv,NULL);
2981 }
2982
2983 /**
2984 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2985 * @table: the sysctl table
2986 * @write: %TRUE if this is a write to the sysctl file
2987 * @buffer: the user buffer
2988 * @lenp: the size of the user buffer
2989 * @ppos: file position
2990 * @ppos: the current position in the file
2991 *
2992 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2993 * values from/to the user buffer, treated as an ASCII string.
2994 * The values read are assumed to be in 1/1000 seconds, and
2995 * are converted into jiffies.
2996 *
2997 * Returns 0 on success.
2998 */
2999 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
3000 void __user *buffer, size_t *lenp, loff_t *ppos)
3001 {
3002 return do_proc_dointvec(table, write, buffer, lenp, ppos,
3003 do_proc_dointvec_ms_jiffies_conv, NULL);
3004 }
3005
3006 static int proc_do_cad_pid(struct ctl_table *table, int write,
3007 void __user *buffer, size_t *lenp, loff_t *ppos)
3008 {
3009 struct pid *new_pid;
3010 pid_t tmp;
3011 int r;
3012
3013 tmp = pid_vnr(cad_pid);
3014
3015 r = __do_proc_dointvec(&tmp, table, write, buffer,
3016 lenp, ppos, NULL, NULL);
3017 if (r || !write)
3018 return r;
3019
3020 new_pid = find_get_pid(tmp);
3021 if (!new_pid)
3022 return -ESRCH;
3023
3024 put_pid(xchg(&cad_pid, new_pid));
3025 return 0;
3026 }
3027
3028 /**
3029 * proc_do_large_bitmap - read/write from/to a large bitmap
3030 * @table: the sysctl table
3031 * @write: %TRUE if this is a write to the sysctl file
3032 * @buffer: the user buffer
3033 * @lenp: the size of the user buffer
3034 * @ppos: file position
3035 *
3036 * The bitmap is stored at table->data and the bitmap length (in bits)
3037 * in table->maxlen.
3038 *
3039 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
3040 * large bitmaps may be represented in a compact manner. Writing into
3041 * the file will clear the bitmap then update it with the given input.
3042 *
3043 * Returns 0 on success.
3044 */
3045 int proc_do_large_bitmap(struct ctl_table *table, int write,
3046 void __user *buffer, size_t *lenp, loff_t *ppos)
3047 {
3048 int err = 0;
3049 bool first = 1;
3050 size_t left = *lenp;
3051 unsigned long bitmap_len = table->maxlen;
3052 unsigned long *bitmap = *(unsigned long **) table->data;
3053 unsigned long *tmp_bitmap = NULL;
3054 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
3055
3056 if (!bitmap || !bitmap_len || !left || (*ppos && !write)) {
3057 *lenp = 0;
3058 return 0;
3059 }
3060
3061 if (write) {
3062 char *kbuf, *p;
3063
3064 if (left > PAGE_SIZE - 1)
3065 left = PAGE_SIZE - 1;
3066
3067 p = kbuf = memdup_user_nul(buffer, left);
3068 if (IS_ERR(kbuf))
3069 return PTR_ERR(kbuf);
3070
3071 tmp_bitmap = kcalloc(BITS_TO_LONGS(bitmap_len),
3072 sizeof(unsigned long),
3073 GFP_KERNEL);
3074 if (!tmp_bitmap) {
3075 kfree(kbuf);
3076 return -ENOMEM;
3077 }
3078 proc_skip_char(&p, &left, '\n');
3079 while (!err && left) {
3080 unsigned long val_a, val_b;
3081 bool neg;
3082
3083 err = proc_get_long(&p, &left, &val_a, &neg, tr_a,
3084 sizeof(tr_a), &c);
3085 if (err)
3086 break;
3087 if (val_a >= bitmap_len || neg) {
3088 err = -EINVAL;
3089 break;
3090 }
3091
3092 val_b = val_a;
3093 if (left) {
3094 p++;
3095 left--;
3096 }
3097
3098 if (c == '-') {
3099 err = proc_get_long(&p, &left, &val_b,
3100 &neg, tr_b, sizeof(tr_b),
3101 &c);
3102 if (err)
3103 break;
3104 if (val_b >= bitmap_len || neg ||
3105 val_a > val_b) {
3106 err = -EINVAL;
3107 break;
3108 }
3109 if (left) {
3110 p++;
3111 left--;
3112 }
3113 }
3114
3115 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
3116 first = 0;
3117 proc_skip_char(&p, &left, '\n');
3118 }
3119 kfree(kbuf);
3120 } else {
3121 unsigned long bit_a, bit_b = 0;
3122
3123 while (left) {
3124 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
3125 if (bit_a >= bitmap_len)
3126 break;
3127 bit_b = find_next_zero_bit(bitmap, bitmap_len,
3128 bit_a + 1) - 1;
3129
3130 if (!first) {
3131 err = proc_put_char(&buffer, &left, ',');
3132 if (err)
3133 break;
3134 }
3135 err = proc_put_long(&buffer, &left, bit_a, false);
3136 if (err)
3137 break;
3138 if (bit_a != bit_b) {
3139 err = proc_put_char(&buffer, &left, '-');
3140 if (err)
3141 break;
3142 err = proc_put_long(&buffer, &left, bit_b, false);
3143 if (err)
3144 break;
3145 }
3146
3147 first = 0; bit_b++;
3148 }
3149 if (!err)
3150 err = proc_put_char(&buffer, &left, '\n');
3151 }
3152
3153 if (!err) {
3154 if (write) {
3155 if (*ppos)
3156 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
3157 else
3158 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
3159 }
3160 *lenp -= left;
3161 *ppos += *lenp;
3162 }
3163
3164 kfree(tmp_bitmap);
3165 return err;
3166 }
3167
3168 #else /* CONFIG_PROC_SYSCTL */
3169
3170 int proc_dostring(struct ctl_table *table, int write,
3171 void __user *buffer, size_t *lenp, loff_t *ppos)
3172 {
3173 return -ENOSYS;
3174 }
3175
3176 int proc_dointvec(struct ctl_table *table, int write,
3177 void __user *buffer, size_t *lenp, loff_t *ppos)
3178 {
3179 return -ENOSYS;
3180 }
3181
3182 int proc_douintvec(struct ctl_table *table, int write,
3183 void __user *buffer, size_t *lenp, loff_t *ppos)
3184 {
3185 return -ENOSYS;
3186 }
3187
3188 int proc_dointvec_minmax(struct ctl_table *table, int write,
3189 void __user *buffer, size_t *lenp, loff_t *ppos)
3190 {
3191 return -ENOSYS;
3192 }
3193
3194 int proc_douintvec_minmax(struct ctl_table *table, int write,
3195 void __user *buffer, size_t *lenp, loff_t *ppos)
3196 {
3197 return -ENOSYS;
3198 }
3199
3200 int proc_dointvec_jiffies(struct ctl_table *table, int write,
3201 void __user *buffer, size_t *lenp, loff_t *ppos)
3202 {
3203 return -ENOSYS;
3204 }
3205
3206 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
3207 void __user *buffer, size_t *lenp, loff_t *ppos)
3208 {
3209 return -ENOSYS;
3210 }
3211
3212 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
3213 void __user *buffer, size_t *lenp, loff_t *ppos)
3214 {
3215 return -ENOSYS;
3216 }
3217
3218 int proc_doulongvec_minmax(struct ctl_table *table, int write,
3219 void __user *buffer, size_t *lenp, loff_t *ppos)
3220 {
3221 return -ENOSYS;
3222 }
3223
3224 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
3225 void __user *buffer,
3226 size_t *lenp, loff_t *ppos)
3227 {
3228 return -ENOSYS;
3229 }
3230
3231
3232 #endif /* CONFIG_PROC_SYSCTL */
3233
3234 /*
3235 * No sense putting this after each symbol definition, twice,
3236 * exception granted :-)
3237 */
3238 EXPORT_SYMBOL(proc_dointvec);
3239 EXPORT_SYMBOL(proc_douintvec);
3240 EXPORT_SYMBOL(proc_dointvec_jiffies);
3241 EXPORT_SYMBOL(proc_dointvec_minmax);
3242 EXPORT_SYMBOL_GPL(proc_douintvec_minmax);
3243 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
3244 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
3245 EXPORT_SYMBOL(proc_dostring);
3246 EXPORT_SYMBOL(proc_doulongvec_minmax);
3247 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
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