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add toggle for disabling newly added USB devices
[GitHub/moto-9609/android_kernel_motorola_exynos9610.git] / kernel / sysctl.c
1 /*
2 * sysctl.c: General linux system control interface
3 *
4 * Begun 24 March 1995, Stephen Tweedie
5 * Added /proc support, Dec 1995
6 * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
7 * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
8 * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
9 * Dynamic registration fixes, Stephen Tweedie.
10 * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
11 * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
12 * Horn.
13 * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
14 * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
15 * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
16 * Wendling.
17 * The list_for_each() macro wasn't appropriate for the sysctl loop.
18 * Removed it and replaced it with older style, 03/23/00, Bill Wendling
19 */
20
21 #include <linux/module.h>
22 #include <linux/aio.h>
23 #include <linux/mm.h>
24 #include <linux/swap.h>
25 #include <linux/slab.h>
26 #include <linux/sysctl.h>
27 #include <linux/bitmap.h>
28 #include <linux/signal.h>
29 #include <linux/printk.h>
30 #include <linux/proc_fs.h>
31 #include <linux/security.h>
32 #include <linux/ctype.h>
33 #include <linux/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
70 #include <linux/uaccess.h>
71 #include <asm/processor.h>
72
73 #ifdef CONFIG_X86
74 #include <asm/nmi.h>
75 #include <asm/stacktrace.h>
76 #include <asm/io.h>
77 #endif
78 #ifdef CONFIG_SPARC
79 #include <asm/setup.h>
80 #endif
81 #ifdef CONFIG_BSD_PROCESS_ACCT
82 #include <linux/acct.h>
83 #endif
84 #ifdef CONFIG_RT_MUTEXES
85 #include <linux/rtmutex.h>
86 #endif
87 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
88 #include <linux/lockdep.h>
89 #endif
90 #ifdef CONFIG_CHR_DEV_SG
91 #include <scsi/sg.h>
92 #endif
93
94 #ifdef CONFIG_LOCKUP_DETECTOR
95 #include <linux/nmi.h>
96 #endif
97
98 #if defined(CONFIG_SYSCTL)
99
100 /* External variables not in a header file. */
101 #ifdef CONFIG_USB
102 int deny_new_usb __read_mostly = 0;
103 EXPORT_SYMBOL(deny_new_usb);
104 #endif
105 extern int suid_dumpable;
106 #ifdef CONFIG_COREDUMP
107 extern int core_uses_pid;
108 extern char core_pattern[];
109 extern unsigned int core_pipe_limit;
110 #endif
111 extern int pid_max;
112 extern int extra_free_kbytes;
113 extern int pid_max_min, pid_max_max;
114 extern int percpu_pagelist_fraction;
115 extern int latencytop_enabled;
116 extern unsigned int sysctl_nr_open_min, sysctl_nr_open_max;
117 #ifndef CONFIG_MMU
118 extern int sysctl_nr_trim_pages;
119 #endif
120
121 /* Constants used for minimum and maximum */
122 #ifdef CONFIG_LOCKUP_DETECTOR
123 static int sixty = 60;
124 #endif
125
126 static int __maybe_unused neg_one = -1;
127
128 static int zero;
129 static int __maybe_unused one = 1;
130 static int __maybe_unused two = 2;
131 static int __maybe_unused four = 4;
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 /*this is needed for proc_doulongvec_minmax of sysctl_hung_task_timeout_secs */
154 #ifdef CONFIG_DETECT_HUNG_TASK
155 static unsigned long hung_task_timeout_max = (LONG_MAX/HZ);
156 #endif
157
158 #ifdef CONFIG_INOTIFY_USER
159 #include <linux/inotify.h>
160 #endif
161 #ifdef CONFIG_SPARC
162 #endif
163
164 #ifdef __hppa__
165 extern int pwrsw_enabled;
166 #endif
167
168 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
169 extern int unaligned_enabled;
170 #endif
171
172 #ifdef CONFIG_IA64
173 extern int unaligned_dump_stack;
174 #endif
175
176 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
177 extern int no_unaligned_warning;
178 #endif
179
180 #ifdef CONFIG_PROC_SYSCTL
181
182 /**
183 * enum sysctl_writes_mode - supported sysctl write modes
184 *
185 * @SYSCTL_WRITES_LEGACY: each write syscall must fully contain the sysctl value
186 * to be written, and multiple writes on the same sysctl file descriptor
187 * will rewrite the sysctl value, regardless of file position. No warning
188 * is issued when the initial position is not 0.
189 * @SYSCTL_WRITES_WARN: same as above but warn when the initial file position is
190 * not 0.
191 * @SYSCTL_WRITES_STRICT: writes to numeric sysctl entries must always be at
192 * file position 0 and the value must be fully contained in the buffer
193 * sent to the write syscall. If dealing with strings respect the file
194 * position, but restrict this to the max length of the buffer, anything
195 * passed the max lenght will be ignored. Multiple writes will append
196 * to the buffer.
197 *
198 * These write modes control how current file position affects the behavior of
199 * updating sysctl values through the proc interface on each write.
200 */
201 enum sysctl_writes_mode {
202 SYSCTL_WRITES_LEGACY = -1,
203 SYSCTL_WRITES_WARN = 0,
204 SYSCTL_WRITES_STRICT = 1,
205 };
206
207 static enum sysctl_writes_mode sysctl_writes_strict = SYSCTL_WRITES_STRICT;
208
209 static int proc_do_cad_pid(struct ctl_table *table, int write,
210 void __user *buffer, size_t *lenp, loff_t *ppos);
211 static int proc_taint(struct ctl_table *table, int write,
212 void __user *buffer, size_t *lenp, loff_t *ppos);
213 #endif
214
215 #ifdef CONFIG_PRINTK
216 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
217 void __user *buffer, size_t *lenp, loff_t *ppos);
218 #endif
219
220 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
221 void __user *buffer, size_t *lenp, loff_t *ppos);
222 #ifdef CONFIG_COREDUMP
223 static int proc_dostring_coredump(struct ctl_table *table, int write,
224 void __user *buffer, size_t *lenp, loff_t *ppos);
225 #endif
226
227 #ifdef CONFIG_MAGIC_SYSRQ
228 /* Note: sysrq code uses it's 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 HAVE_ARCH_PICK_MMAP_LAYOUT
260 int sysctl_legacy_va_layout;
261 #endif
262
263 /* The default sysctl tables: */
264
265 static struct ctl_table sysctl_base_table[] = {
266 {
267 .procname = "kernel",
268 .mode = 0555,
269 .child = kern_table,
270 },
271 {
272 .procname = "vm",
273 .mode = 0555,
274 .child = vm_table,
275 },
276 {
277 .procname = "fs",
278 .mode = 0555,
279 .child = fs_table,
280 },
281 {
282 .procname = "debug",
283 .mode = 0555,
284 .child = debug_table,
285 },
286 {
287 .procname = "dev",
288 .mode = 0555,
289 .child = dev_table,
290 },
291 { }
292 };
293
294 #ifdef CONFIG_SCHED_DEBUG
295 static int min_sched_granularity_ns = 100000; /* 100 usecs */
296 static int max_sched_granularity_ns = NSEC_PER_SEC; /* 1 second */
297 static int min_wakeup_granularity_ns; /* 0 usecs */
298 static int max_wakeup_granularity_ns = NSEC_PER_SEC; /* 1 second */
299 #ifdef CONFIG_SMP
300 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
301 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
302 #endif /* CONFIG_SMP */
303 #endif /* CONFIG_SCHED_DEBUG */
304
305 #ifdef CONFIG_COMPACTION
306 static int min_extfrag_threshold;
307 static int max_extfrag_threshold = 1000;
308 #endif
309
310 static struct ctl_table kern_table[] = {
311 {
312 .procname = "sched_child_runs_first",
313 .data = &sysctl_sched_child_runs_first,
314 .maxlen = sizeof(unsigned int),
315 .mode = 0644,
316 .proc_handler = proc_dointvec,
317 },
318 #ifdef CONFIG_SCHED_DEBUG
319 {
320 .procname = "sched_min_granularity_ns",
321 .data = &sysctl_sched_min_granularity,
322 .maxlen = sizeof(unsigned int),
323 .mode = 0644,
324 .proc_handler = sched_proc_update_handler,
325 .extra1 = &min_sched_granularity_ns,
326 .extra2 = &max_sched_granularity_ns,
327 },
328 {
329 .procname = "sched_latency_ns",
330 .data = &sysctl_sched_latency,
331 .maxlen = sizeof(unsigned int),
332 .mode = 0644,
333 .proc_handler = sched_proc_update_handler,
334 .extra1 = &min_sched_granularity_ns,
335 .extra2 = &max_sched_granularity_ns,
336 },
337 #ifdef CONFIG_SCHED_WALT
338 {
339 .procname = "sched_use_walt_cpu_util",
340 .data = &sysctl_sched_use_walt_cpu_util,
341 .maxlen = sizeof(unsigned int),
342 .mode = 0644,
343 .proc_handler = proc_dointvec,
344 },
345 {
346 .procname = "sched_use_walt_task_util",
347 .data = &sysctl_sched_use_walt_task_util,
348 .maxlen = sizeof(unsigned int),
349 .mode = 0644,
350 .proc_handler = proc_dointvec,
351 },
352 {
353 .procname = "sched_walt_init_task_load_pct",
354 .data = &sysctl_sched_walt_init_task_load_pct,
355 .maxlen = sizeof(unsigned int),
356 .mode = 0644,
357 .proc_handler = proc_dointvec,
358 },
359 {
360 .procname = "sched_walt_cpu_high_irqload",
361 .data = &sysctl_sched_walt_cpu_high_irqload,
362 .maxlen = sizeof(unsigned int),
363 .mode = 0644,
364 .proc_handler = proc_dointvec,
365 },
366 #endif
367 {
368 .procname = "sched_sync_hint_enable",
369 .data = &sysctl_sched_sync_hint_enable,
370 .maxlen = sizeof(unsigned int),
371 .mode = 0644,
372 .proc_handler = proc_dointvec,
373 },
374 {
375 .procname = "sched_cstate_aware",
376 .data = &sysctl_sched_cstate_aware,
377 .maxlen = sizeof(unsigned int),
378 .mode = 0644,
379 .proc_handler = proc_dointvec,
380 },
381 {
382 .procname = "sched_wakeup_granularity_ns",
383 .data = &sysctl_sched_wakeup_granularity,
384 .maxlen = sizeof(unsigned int),
385 .mode = 0644,
386 .proc_handler = sched_proc_update_handler,
387 .extra1 = &min_wakeup_granularity_ns,
388 .extra2 = &max_wakeup_granularity_ns,
389 },
390 #ifdef CONFIG_SMP
391 {
392 .procname = "sched_tunable_scaling",
393 .data = &sysctl_sched_tunable_scaling,
394 .maxlen = sizeof(enum sched_tunable_scaling),
395 .mode = 0644,
396 .proc_handler = sched_proc_update_handler,
397 .extra1 = &min_sched_tunable_scaling,
398 .extra2 = &max_sched_tunable_scaling,
399 },
400 {
401 .procname = "sched_migration_cost_ns",
402 .data = &sysctl_sched_migration_cost,
403 .maxlen = sizeof(unsigned int),
404 .mode = 0644,
405 .proc_handler = proc_dointvec,
406 },
407 {
408 .procname = "sched_nr_migrate",
409 .data = &sysctl_sched_nr_migrate,
410 .maxlen = sizeof(unsigned int),
411 .mode = 0644,
412 .proc_handler = proc_dointvec,
413 },
414 {
415 .procname = "sched_time_avg_ms",
416 .data = &sysctl_sched_time_avg,
417 .maxlen = sizeof(unsigned int),
418 .mode = 0644,
419 .proc_handler = proc_dointvec_minmax,
420 .extra1 = &one,
421 },
422 #ifdef CONFIG_SCHEDSTATS
423 {
424 .procname = "sched_schedstats",
425 .data = NULL,
426 .maxlen = sizeof(unsigned int),
427 .mode = 0644,
428 .proc_handler = sysctl_schedstats,
429 .extra1 = &zero,
430 .extra2 = &one,
431 },
432 #endif /* CONFIG_SCHEDSTATS */
433 #endif /* CONFIG_SMP */
434 #ifdef CONFIG_NUMA_BALANCING
435 {
436 .procname = "numa_balancing_scan_delay_ms",
437 .data = &sysctl_numa_balancing_scan_delay,
438 .maxlen = sizeof(unsigned int),
439 .mode = 0644,
440 .proc_handler = proc_dointvec,
441 },
442 {
443 .procname = "numa_balancing_scan_period_min_ms",
444 .data = &sysctl_numa_balancing_scan_period_min,
445 .maxlen = sizeof(unsigned int),
446 .mode = 0644,
447 .proc_handler = proc_dointvec,
448 },
449 {
450 .procname = "numa_balancing_scan_period_max_ms",
451 .data = &sysctl_numa_balancing_scan_period_max,
452 .maxlen = sizeof(unsigned int),
453 .mode = 0644,
454 .proc_handler = proc_dointvec,
455 },
456 {
457 .procname = "numa_balancing_scan_size_mb",
458 .data = &sysctl_numa_balancing_scan_size,
459 .maxlen = sizeof(unsigned int),
460 .mode = 0644,
461 .proc_handler = proc_dointvec_minmax,
462 .extra1 = &one,
463 },
464 {
465 .procname = "numa_balancing",
466 .data = NULL, /* filled in by handler */
467 .maxlen = sizeof(unsigned int),
468 .mode = 0644,
469 .proc_handler = sysctl_numa_balancing,
470 .extra1 = &zero,
471 .extra2 = &one,
472 },
473 #endif /* CONFIG_NUMA_BALANCING */
474 #endif /* CONFIG_SCHED_DEBUG */
475 {
476 .procname = "sched_rt_period_us",
477 .data = &sysctl_sched_rt_period,
478 .maxlen = sizeof(unsigned int),
479 .mode = 0644,
480 .proc_handler = sched_rt_handler,
481 },
482 {
483 .procname = "sched_rt_runtime_us",
484 .data = &sysctl_sched_rt_runtime,
485 .maxlen = sizeof(int),
486 .mode = 0644,
487 .proc_handler = sched_rt_handler,
488 },
489 {
490 .procname = "sched_rr_timeslice_ms",
491 .data = &sysctl_sched_rr_timeslice,
492 .maxlen = sizeof(int),
493 .mode = 0644,
494 .proc_handler = sched_rr_handler,
495 },
496 #ifdef CONFIG_SCHED_AUTOGROUP
497 {
498 .procname = "sched_autogroup_enabled",
499 .data = &sysctl_sched_autogroup_enabled,
500 .maxlen = sizeof(unsigned int),
501 .mode = 0644,
502 .proc_handler = proc_dointvec_minmax,
503 .extra1 = &zero,
504 .extra2 = &one,
505 },
506 #endif
507 #ifdef CONFIG_CFS_BANDWIDTH
508 {
509 .procname = "sched_cfs_bandwidth_slice_us",
510 .data = &sysctl_sched_cfs_bandwidth_slice,
511 .maxlen = sizeof(unsigned int),
512 .mode = 0644,
513 .proc_handler = proc_dointvec_minmax,
514 .extra1 = &one,
515 },
516 #endif
517 #ifdef CONFIG_PROVE_LOCKING
518 {
519 .procname = "prove_locking",
520 .data = &prove_locking,
521 .maxlen = sizeof(int),
522 .mode = 0644,
523 .proc_handler = proc_dointvec,
524 },
525 #endif
526 #ifdef CONFIG_LOCK_STAT
527 {
528 .procname = "lock_stat",
529 .data = &lock_stat,
530 .maxlen = sizeof(int),
531 .mode = 0644,
532 .proc_handler = proc_dointvec,
533 },
534 #endif
535 {
536 .procname = "panic",
537 .data = &panic_timeout,
538 .maxlen = sizeof(int),
539 .mode = 0644,
540 .proc_handler = proc_dointvec,
541 },
542 #ifdef CONFIG_COREDUMP
543 {
544 .procname = "core_uses_pid",
545 .data = &core_uses_pid,
546 .maxlen = sizeof(int),
547 .mode = 0644,
548 .proc_handler = proc_dointvec,
549 },
550 {
551 .procname = "core_pattern",
552 .data = core_pattern,
553 .maxlen = CORENAME_MAX_SIZE,
554 .mode = 0644,
555 .proc_handler = proc_dostring_coredump,
556 },
557 {
558 .procname = "core_pipe_limit",
559 .data = &core_pipe_limit,
560 .maxlen = sizeof(unsigned int),
561 .mode = 0644,
562 .proc_handler = proc_dointvec,
563 },
564 #endif
565 #ifdef CONFIG_PROC_SYSCTL
566 {
567 .procname = "tainted",
568 .maxlen = sizeof(long),
569 .mode = 0644,
570 .proc_handler = proc_taint,
571 },
572 {
573 .procname = "sysctl_writes_strict",
574 .data = &sysctl_writes_strict,
575 .maxlen = sizeof(int),
576 .mode = 0644,
577 .proc_handler = proc_dointvec_minmax,
578 .extra1 = &neg_one,
579 .extra2 = &one,
580 },
581 #endif
582 #ifdef CONFIG_LATENCYTOP
583 {
584 .procname = "latencytop",
585 .data = &latencytop_enabled,
586 .maxlen = sizeof(int),
587 .mode = 0644,
588 .proc_handler = sysctl_latencytop,
589 },
590 #endif
591 #ifdef CONFIG_BLK_DEV_INITRD
592 {
593 .procname = "real-root-dev",
594 .data = &real_root_dev,
595 .maxlen = sizeof(int),
596 .mode = 0644,
597 .proc_handler = proc_dointvec,
598 },
599 #endif
600 {
601 .procname = "print-fatal-signals",
602 .data = &print_fatal_signals,
603 .maxlen = sizeof(int),
604 .mode = 0644,
605 .proc_handler = proc_dointvec,
606 },
607 #ifdef CONFIG_SPARC
608 {
609 .procname = "reboot-cmd",
610 .data = reboot_command,
611 .maxlen = 256,
612 .mode = 0644,
613 .proc_handler = proc_dostring,
614 },
615 {
616 .procname = "stop-a",
617 .data = &stop_a_enabled,
618 .maxlen = sizeof (int),
619 .mode = 0644,
620 .proc_handler = proc_dointvec,
621 },
622 {
623 .procname = "scons-poweroff",
624 .data = &scons_pwroff,
625 .maxlen = sizeof (int),
626 .mode = 0644,
627 .proc_handler = proc_dointvec,
628 },
629 #endif
630 #ifdef CONFIG_SPARC64
631 {
632 .procname = "tsb-ratio",
633 .data = &sysctl_tsb_ratio,
634 .maxlen = sizeof (int),
635 .mode = 0644,
636 .proc_handler = proc_dointvec,
637 },
638 #endif
639 #ifdef __hppa__
640 {
641 .procname = "soft-power",
642 .data = &pwrsw_enabled,
643 .maxlen = sizeof (int),
644 .mode = 0644,
645 .proc_handler = proc_dointvec,
646 },
647 #endif
648 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
649 {
650 .procname = "unaligned-trap",
651 .data = &unaligned_enabled,
652 .maxlen = sizeof (int),
653 .mode = 0644,
654 .proc_handler = proc_dointvec,
655 },
656 #endif
657 {
658 .procname = "ctrl-alt-del",
659 .data = &C_A_D,
660 .maxlen = sizeof(int),
661 .mode = 0644,
662 .proc_handler = proc_dointvec,
663 },
664 #ifdef CONFIG_FUNCTION_TRACER
665 {
666 .procname = "ftrace_enabled",
667 .data = &ftrace_enabled,
668 .maxlen = sizeof(int),
669 .mode = 0644,
670 .proc_handler = ftrace_enable_sysctl,
671 },
672 #endif
673 #ifdef CONFIG_STACK_TRACER
674 {
675 .procname = "stack_tracer_enabled",
676 .data = &stack_tracer_enabled,
677 .maxlen = sizeof(int),
678 .mode = 0644,
679 .proc_handler = stack_trace_sysctl,
680 },
681 #endif
682 #ifdef CONFIG_TRACING
683 {
684 .procname = "ftrace_dump_on_oops",
685 .data = &ftrace_dump_on_oops,
686 .maxlen = sizeof(int),
687 .mode = 0644,
688 .proc_handler = proc_dointvec,
689 },
690 {
691 .procname = "traceoff_on_warning",
692 .data = &__disable_trace_on_warning,
693 .maxlen = sizeof(__disable_trace_on_warning),
694 .mode = 0644,
695 .proc_handler = proc_dointvec,
696 },
697 {
698 .procname = "tracepoint_printk",
699 .data = &tracepoint_printk,
700 .maxlen = sizeof(tracepoint_printk),
701 .mode = 0644,
702 .proc_handler = tracepoint_printk_sysctl,
703 },
704 #endif
705 #ifdef CONFIG_KEXEC_CORE
706 {
707 .procname = "kexec_load_disabled",
708 .data = &kexec_load_disabled,
709 .maxlen = sizeof(int),
710 .mode = 0644,
711 /* only handle a transition from default "0" to "1" */
712 .proc_handler = proc_dointvec_minmax,
713 .extra1 = &one,
714 .extra2 = &one,
715 },
716 #endif
717 #ifdef CONFIG_MODULES
718 {
719 .procname = "modprobe",
720 .data = &modprobe_path,
721 .maxlen = KMOD_PATH_LEN,
722 .mode = 0644,
723 .proc_handler = proc_dostring,
724 },
725 {
726 .procname = "modules_disabled",
727 .data = &modules_disabled,
728 .maxlen = sizeof(int),
729 .mode = 0644,
730 /* only handle a transition from default "0" to "1" */
731 .proc_handler = proc_dointvec_minmax,
732 .extra1 = &one,
733 .extra2 = &one,
734 },
735 #endif
736 #ifdef CONFIG_UEVENT_HELPER
737 {
738 .procname = "hotplug",
739 .data = &uevent_helper,
740 .maxlen = UEVENT_HELPER_PATH_LEN,
741 .mode = 0644,
742 .proc_handler = proc_dostring,
743 },
744 #endif
745 #ifdef CONFIG_CHR_DEV_SG
746 {
747 .procname = "sg-big-buff",
748 .data = &sg_big_buff,
749 .maxlen = sizeof (int),
750 .mode = 0444,
751 .proc_handler = proc_dointvec,
752 },
753 #endif
754 #ifdef CONFIG_BSD_PROCESS_ACCT
755 {
756 .procname = "acct",
757 .data = &acct_parm,
758 .maxlen = 3*sizeof(int),
759 .mode = 0644,
760 .proc_handler = proc_dointvec,
761 },
762 #endif
763 #ifdef CONFIG_MAGIC_SYSRQ
764 {
765 .procname = "sysrq",
766 .data = &__sysrq_enabled,
767 .maxlen = sizeof (int),
768 .mode = 0644,
769 .proc_handler = sysrq_sysctl_handler,
770 },
771 #endif
772 #ifdef CONFIG_PROC_SYSCTL
773 {
774 .procname = "cad_pid",
775 .data = NULL,
776 .maxlen = sizeof (int),
777 .mode = 0600,
778 .proc_handler = proc_do_cad_pid,
779 },
780 #endif
781 {
782 .procname = "threads-max",
783 .data = NULL,
784 .maxlen = sizeof(int),
785 .mode = 0644,
786 .proc_handler = sysctl_max_threads,
787 },
788 {
789 .procname = "random",
790 .mode = 0555,
791 .child = random_table,
792 },
793 {
794 .procname = "usermodehelper",
795 .mode = 0555,
796 .child = usermodehelper_table,
797 },
798 {
799 .procname = "overflowuid",
800 .data = &overflowuid,
801 .maxlen = sizeof(int),
802 .mode = 0644,
803 .proc_handler = proc_dointvec_minmax,
804 .extra1 = &minolduid,
805 .extra2 = &maxolduid,
806 },
807 {
808 .procname = "overflowgid",
809 .data = &overflowgid,
810 .maxlen = sizeof(int),
811 .mode = 0644,
812 .proc_handler = proc_dointvec_minmax,
813 .extra1 = &minolduid,
814 .extra2 = &maxolduid,
815 },
816 #ifdef CONFIG_S390
817 #ifdef CONFIG_MATHEMU
818 {
819 .procname = "ieee_emulation_warnings",
820 .data = &sysctl_ieee_emulation_warnings,
821 .maxlen = sizeof(int),
822 .mode = 0644,
823 .proc_handler = proc_dointvec,
824 },
825 #endif
826 {
827 .procname = "userprocess_debug",
828 .data = &show_unhandled_signals,
829 .maxlen = sizeof(int),
830 .mode = 0644,
831 .proc_handler = proc_dointvec,
832 },
833 #endif
834 {
835 .procname = "pid_max",
836 .data = &pid_max,
837 .maxlen = sizeof (int),
838 .mode = 0644,
839 .proc_handler = proc_dointvec_minmax,
840 .extra1 = &pid_max_min,
841 .extra2 = &pid_max_max,
842 },
843 {
844 .procname = "panic_on_oops",
845 .data = &panic_on_oops,
846 .maxlen = sizeof(int),
847 .mode = 0644,
848 .proc_handler = proc_dointvec,
849 },
850 #if defined CONFIG_PRINTK
851 {
852 .procname = "printk",
853 .data = &console_loglevel,
854 .maxlen = 4*sizeof(int),
855 .mode = 0644,
856 .proc_handler = proc_dointvec,
857 },
858 {
859 .procname = "printk_ratelimit",
860 .data = &printk_ratelimit_state.interval,
861 .maxlen = sizeof(int),
862 .mode = 0644,
863 .proc_handler = proc_dointvec_jiffies,
864 },
865 {
866 .procname = "printk_ratelimit_burst",
867 .data = &printk_ratelimit_state.burst,
868 .maxlen = sizeof(int),
869 .mode = 0644,
870 .proc_handler = proc_dointvec,
871 },
872 {
873 .procname = "printk_delay",
874 .data = &printk_delay_msec,
875 .maxlen = sizeof(int),
876 .mode = 0644,
877 .proc_handler = proc_dointvec_minmax,
878 .extra1 = &zero,
879 .extra2 = &ten_thousand,
880 },
881 {
882 .procname = "printk_devkmsg",
883 .data = devkmsg_log_str,
884 .maxlen = DEVKMSG_STR_MAX_SIZE,
885 .mode = 0644,
886 .proc_handler = devkmsg_sysctl_set_loglvl,
887 },
888 {
889 .procname = "dmesg_restrict",
890 .data = &dmesg_restrict,
891 .maxlen = sizeof(int),
892 .mode = 0644,
893 .proc_handler = proc_dointvec_minmax_sysadmin,
894 .extra1 = &zero,
895 .extra2 = &one,
896 },
897 {
898 .procname = "kptr_restrict",
899 .data = &kptr_restrict,
900 .maxlen = sizeof(int),
901 .mode = 0644,
902 .proc_handler = proc_dointvec_minmax_sysadmin,
903 .extra1 = &zero,
904 .extra2 = &two,
905 },
906 #endif
907
908 #ifdef CONFIG_USB
909 {
910 .procname = "deny_new_usb",
911 .data = &deny_new_usb,
912 .maxlen = sizeof(int),
913 .mode = 0644,
914 .proc_handler = proc_dointvec_minmax_sysadmin,
915 .extra1 = &zero,
916 .extra2 = &one,
917 },
918 #endif
919 {
920 .procname = "ngroups_max",
921 .data = &ngroups_max,
922 .maxlen = sizeof (int),
923 .mode = 0444,
924 .proc_handler = proc_dointvec,
925 },
926 {
927 .procname = "cap_last_cap",
928 .data = (void *)&cap_last_cap,
929 .maxlen = sizeof(int),
930 .mode = 0444,
931 .proc_handler = proc_dointvec,
932 },
933 #if defined(CONFIG_LOCKUP_DETECTOR)
934 {
935 .procname = "watchdog",
936 .data = &watchdog_user_enabled,
937 .maxlen = sizeof(int),
938 .mode = 0644,
939 .proc_handler = proc_watchdog,
940 .extra1 = &zero,
941 .extra2 = &one,
942 },
943 {
944 .procname = "watchdog_thresh",
945 .data = &watchdog_thresh,
946 .maxlen = sizeof(int),
947 .mode = 0644,
948 .proc_handler = proc_watchdog_thresh,
949 .extra1 = &zero,
950 .extra2 = &sixty,
951 },
952 {
953 .procname = "nmi_watchdog",
954 .data = &nmi_watchdog_user_enabled,
955 .maxlen = sizeof(int),
956 .mode = NMI_WATCHDOG_SYSCTL_PERM,
957 .proc_handler = proc_nmi_watchdog,
958 .extra1 = &zero,
959 .extra2 = &one,
960 },
961 {
962 .procname = "watchdog_cpumask",
963 .data = &watchdog_cpumask_bits,
964 .maxlen = NR_CPUS,
965 .mode = 0644,
966 .proc_handler = proc_watchdog_cpumask,
967 },
968 #ifdef CONFIG_SOFTLOCKUP_DETECTOR
969 {
970 .procname = "soft_watchdog",
971 .data = &soft_watchdog_user_enabled,
972 .maxlen = sizeof(int),
973 .mode = 0644,
974 .proc_handler = proc_soft_watchdog,
975 .extra1 = &zero,
976 .extra2 = &one,
977 },
978 {
979 .procname = "softlockup_panic",
980 .data = &softlockup_panic,
981 .maxlen = sizeof(int),
982 .mode = 0644,
983 .proc_handler = proc_dointvec_minmax,
984 .extra1 = &zero,
985 .extra2 = &one,
986 },
987 #ifdef CONFIG_SMP
988 {
989 .procname = "softlockup_all_cpu_backtrace",
990 .data = &sysctl_softlockup_all_cpu_backtrace,
991 .maxlen = sizeof(int),
992 .mode = 0644,
993 .proc_handler = proc_dointvec_minmax,
994 .extra1 = &zero,
995 .extra2 = &one,
996 },
997 #endif /* CONFIG_SMP */
998 #endif
999 #ifdef CONFIG_HARDLOCKUP_DETECTOR
1000 {
1001 .procname = "hardlockup_panic",
1002 .data = &hardlockup_panic,
1003 .maxlen = sizeof(int),
1004 .mode = 0644,
1005 .proc_handler = proc_dointvec_minmax,
1006 .extra1 = &zero,
1007 .extra2 = &one,
1008 },
1009 #ifdef CONFIG_SMP
1010 {
1011 .procname = "hardlockup_all_cpu_backtrace",
1012 .data = &sysctl_hardlockup_all_cpu_backtrace,
1013 .maxlen = sizeof(int),
1014 .mode = 0644,
1015 .proc_handler = proc_dointvec_minmax,
1016 .extra1 = &zero,
1017 .extra2 = &one,
1018 },
1019 #endif /* CONFIG_SMP */
1020 #endif
1021 #endif
1022
1023 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
1024 {
1025 .procname = "unknown_nmi_panic",
1026 .data = &unknown_nmi_panic,
1027 .maxlen = sizeof (int),
1028 .mode = 0644,
1029 .proc_handler = proc_dointvec,
1030 },
1031 #endif
1032 #if defined(CONFIG_X86)
1033 {
1034 .procname = "panic_on_unrecovered_nmi",
1035 .data = &panic_on_unrecovered_nmi,
1036 .maxlen = sizeof(int),
1037 .mode = 0644,
1038 .proc_handler = proc_dointvec,
1039 },
1040 {
1041 .procname = "panic_on_io_nmi",
1042 .data = &panic_on_io_nmi,
1043 .maxlen = sizeof(int),
1044 .mode = 0644,
1045 .proc_handler = proc_dointvec,
1046 },
1047 #ifdef CONFIG_DEBUG_STACKOVERFLOW
1048 {
1049 .procname = "panic_on_stackoverflow",
1050 .data = &sysctl_panic_on_stackoverflow,
1051 .maxlen = sizeof(int),
1052 .mode = 0644,
1053 .proc_handler = proc_dointvec,
1054 },
1055 #endif
1056 {
1057 .procname = "bootloader_type",
1058 .data = &bootloader_type,
1059 .maxlen = sizeof (int),
1060 .mode = 0444,
1061 .proc_handler = proc_dointvec,
1062 },
1063 {
1064 .procname = "bootloader_version",
1065 .data = &bootloader_version,
1066 .maxlen = sizeof (int),
1067 .mode = 0444,
1068 .proc_handler = proc_dointvec,
1069 },
1070 {
1071 .procname = "io_delay_type",
1072 .data = &io_delay_type,
1073 .maxlen = sizeof(int),
1074 .mode = 0644,
1075 .proc_handler = proc_dointvec,
1076 },
1077 #endif
1078 #if defined(CONFIG_MMU)
1079 {
1080 .procname = "randomize_va_space",
1081 .data = &randomize_va_space,
1082 .maxlen = sizeof(int),
1083 .mode = 0644,
1084 .proc_handler = proc_dointvec,
1085 },
1086 #endif
1087 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
1088 {
1089 .procname = "spin_retry",
1090 .data = &spin_retry,
1091 .maxlen = sizeof (int),
1092 .mode = 0644,
1093 .proc_handler = proc_dointvec,
1094 },
1095 #endif
1096 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
1097 {
1098 .procname = "acpi_video_flags",
1099 .data = &acpi_realmode_flags,
1100 .maxlen = sizeof (unsigned long),
1101 .mode = 0644,
1102 .proc_handler = proc_doulongvec_minmax,
1103 },
1104 #endif
1105 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
1106 {
1107 .procname = "ignore-unaligned-usertrap",
1108 .data = &no_unaligned_warning,
1109 .maxlen = sizeof (int),
1110 .mode = 0644,
1111 .proc_handler = proc_dointvec,
1112 },
1113 #endif
1114 #ifdef CONFIG_IA64
1115 {
1116 .procname = "unaligned-dump-stack",
1117 .data = &unaligned_dump_stack,
1118 .maxlen = sizeof (int),
1119 .mode = 0644,
1120 .proc_handler = proc_dointvec,
1121 },
1122 #endif
1123 #ifdef CONFIG_DETECT_HUNG_TASK
1124 {
1125 .procname = "hung_task_panic",
1126 .data = &sysctl_hung_task_panic,
1127 .maxlen = sizeof(int),
1128 .mode = 0644,
1129 .proc_handler = proc_dointvec_minmax,
1130 .extra1 = &zero,
1131 .extra2 = &one,
1132 },
1133 {
1134 .procname = "hung_task_check_count",
1135 .data = &sysctl_hung_task_check_count,
1136 .maxlen = sizeof(int),
1137 .mode = 0644,
1138 .proc_handler = proc_dointvec_minmax,
1139 .extra1 = &zero,
1140 },
1141 {
1142 .procname = "hung_task_timeout_secs",
1143 .data = &sysctl_hung_task_timeout_secs,
1144 .maxlen = sizeof(unsigned long),
1145 .mode = 0644,
1146 .proc_handler = proc_dohung_task_timeout_secs,
1147 .extra2 = &hung_task_timeout_max,
1148 },
1149 {
1150 .procname = "hung_task_warnings",
1151 .data = &sysctl_hung_task_warnings,
1152 .maxlen = sizeof(int),
1153 .mode = 0644,
1154 .proc_handler = proc_dointvec_minmax,
1155 .extra1 = &neg_one,
1156 },
1157 #endif
1158 #ifdef CONFIG_RT_MUTEXES
1159 {
1160 .procname = "max_lock_depth",
1161 .data = &max_lock_depth,
1162 .maxlen = sizeof(int),
1163 .mode = 0644,
1164 .proc_handler = proc_dointvec,
1165 },
1166 #endif
1167 {
1168 .procname = "poweroff_cmd",
1169 .data = &poweroff_cmd,
1170 .maxlen = POWEROFF_CMD_PATH_LEN,
1171 .mode = 0644,
1172 .proc_handler = proc_dostring,
1173 },
1174 #ifdef CONFIG_KEYS
1175 {
1176 .procname = "keys",
1177 .mode = 0555,
1178 .child = key_sysctls,
1179 },
1180 #endif
1181 #ifdef CONFIG_PERF_EVENTS
1182 /*
1183 * User-space scripts rely on the existence of this file
1184 * as a feature check for perf_events being enabled.
1185 *
1186 * So it's an ABI, do not remove!
1187 */
1188 {
1189 .procname = "perf_event_paranoid",
1190 .data = &sysctl_perf_event_paranoid,
1191 .maxlen = sizeof(sysctl_perf_event_paranoid),
1192 .mode = 0644,
1193 .proc_handler = proc_dointvec,
1194 },
1195 {
1196 .procname = "perf_event_mlock_kb",
1197 .data = &sysctl_perf_event_mlock,
1198 .maxlen = sizeof(sysctl_perf_event_mlock),
1199 .mode = 0644,
1200 .proc_handler = proc_dointvec,
1201 },
1202 {
1203 .procname = "perf_event_max_sample_rate",
1204 .data = &sysctl_perf_event_sample_rate,
1205 .maxlen = sizeof(sysctl_perf_event_sample_rate),
1206 .mode = 0644,
1207 .proc_handler = perf_proc_update_handler,
1208 .extra1 = &one,
1209 },
1210 {
1211 .procname = "perf_cpu_time_max_percent",
1212 .data = &sysctl_perf_cpu_time_max_percent,
1213 .maxlen = sizeof(sysctl_perf_cpu_time_max_percent),
1214 .mode = 0644,
1215 .proc_handler = perf_cpu_time_max_percent_handler,
1216 .extra1 = &zero,
1217 .extra2 = &one_hundred,
1218 },
1219 {
1220 .procname = "perf_event_max_stack",
1221 .data = &sysctl_perf_event_max_stack,
1222 .maxlen = sizeof(sysctl_perf_event_max_stack),
1223 .mode = 0644,
1224 .proc_handler = perf_event_max_stack_handler,
1225 .extra1 = &zero,
1226 .extra2 = &six_hundred_forty_kb,
1227 },
1228 {
1229 .procname = "perf_event_max_contexts_per_stack",
1230 .data = &sysctl_perf_event_max_contexts_per_stack,
1231 .maxlen = sizeof(sysctl_perf_event_max_contexts_per_stack),
1232 .mode = 0644,
1233 .proc_handler = perf_event_max_stack_handler,
1234 .extra1 = &zero,
1235 .extra2 = &one_thousand,
1236 },
1237 #endif
1238 {
1239 .procname = "panic_on_warn",
1240 .data = &panic_on_warn,
1241 .maxlen = sizeof(int),
1242 .mode = 0644,
1243 .proc_handler = proc_dointvec_minmax,
1244 .extra1 = &zero,
1245 .extra2 = &one,
1246 },
1247 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
1248 {
1249 .procname = "timer_migration",
1250 .data = &sysctl_timer_migration,
1251 .maxlen = sizeof(unsigned int),
1252 .mode = 0644,
1253 .proc_handler = timer_migration_handler,
1254 .extra1 = &zero,
1255 .extra2 = &one,
1256 },
1257 #endif
1258 #ifdef CONFIG_BPF_SYSCALL
1259 {
1260 .procname = "unprivileged_bpf_disabled",
1261 .data = &sysctl_unprivileged_bpf_disabled,
1262 .maxlen = sizeof(sysctl_unprivileged_bpf_disabled),
1263 .mode = 0644,
1264 /* only handle a transition from default "0" to "1" */
1265 .proc_handler = proc_dointvec_minmax,
1266 .extra1 = &one,
1267 .extra2 = &one,
1268 },
1269 #endif
1270 #if defined(CONFIG_TREE_RCU) || defined(CONFIG_PREEMPT_RCU)
1271 {
1272 .procname = "panic_on_rcu_stall",
1273 .data = &sysctl_panic_on_rcu_stall,
1274 .maxlen = sizeof(sysctl_panic_on_rcu_stall),
1275 .mode = 0644,
1276 .proc_handler = proc_dointvec_minmax,
1277 .extra1 = &zero,
1278 .extra2 = &one,
1279 },
1280 #endif
1281 { }
1282 };
1283
1284 static struct ctl_table vm_table[] = {
1285 {
1286 .procname = "overcommit_memory",
1287 .data = &sysctl_overcommit_memory,
1288 .maxlen = sizeof(sysctl_overcommit_memory),
1289 .mode = 0644,
1290 .proc_handler = proc_dointvec_minmax,
1291 .extra1 = &zero,
1292 .extra2 = &two,
1293 },
1294 {
1295 .procname = "panic_on_oom",
1296 .data = &sysctl_panic_on_oom,
1297 .maxlen = sizeof(sysctl_panic_on_oom),
1298 .mode = 0644,
1299 .proc_handler = proc_dointvec_minmax,
1300 .extra1 = &zero,
1301 .extra2 = &two,
1302 },
1303 {
1304 .procname = "oom_kill_allocating_task",
1305 .data = &sysctl_oom_kill_allocating_task,
1306 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
1307 .mode = 0644,
1308 .proc_handler = proc_dointvec,
1309 },
1310 {
1311 .procname = "oom_dump_tasks",
1312 .data = &sysctl_oom_dump_tasks,
1313 .maxlen = sizeof(sysctl_oom_dump_tasks),
1314 .mode = 0644,
1315 .proc_handler = proc_dointvec,
1316 },
1317 {
1318 .procname = "reap_mem_on_sigkill",
1319 .data = &sysctl_reap_mem_on_sigkill,
1320 .maxlen = sizeof(sysctl_reap_mem_on_sigkill),
1321 .mode = 0644,
1322 .proc_handler = proc_dointvec,
1323 },
1324 {
1325 .procname = "overcommit_ratio",
1326 .data = &sysctl_overcommit_ratio,
1327 .maxlen = sizeof(sysctl_overcommit_ratio),
1328 .mode = 0644,
1329 .proc_handler = overcommit_ratio_handler,
1330 },
1331 {
1332 .procname = "overcommit_kbytes",
1333 .data = &sysctl_overcommit_kbytes,
1334 .maxlen = sizeof(sysctl_overcommit_kbytes),
1335 .mode = 0644,
1336 .proc_handler = overcommit_kbytes_handler,
1337 },
1338 {
1339 .procname = "page-cluster",
1340 .data = &page_cluster,
1341 .maxlen = sizeof(int),
1342 .mode = 0644,
1343 .proc_handler = proc_dointvec_minmax,
1344 .extra1 = &zero,
1345 },
1346 {
1347 .procname = "dirty_background_ratio",
1348 .data = &dirty_background_ratio,
1349 .maxlen = sizeof(dirty_background_ratio),
1350 .mode = 0644,
1351 .proc_handler = dirty_background_ratio_handler,
1352 .extra1 = &zero,
1353 .extra2 = &one_hundred,
1354 },
1355 {
1356 .procname = "dirty_background_bytes",
1357 .data = &dirty_background_bytes,
1358 .maxlen = sizeof(dirty_background_bytes),
1359 .mode = 0644,
1360 .proc_handler = dirty_background_bytes_handler,
1361 .extra1 = &one_ul,
1362 },
1363 {
1364 .procname = "dirty_ratio",
1365 .data = &vm_dirty_ratio,
1366 .maxlen = sizeof(vm_dirty_ratio),
1367 .mode = 0644,
1368 .proc_handler = dirty_ratio_handler,
1369 .extra1 = &zero,
1370 .extra2 = &one_hundred,
1371 },
1372 {
1373 .procname = "dirty_bytes",
1374 .data = &vm_dirty_bytes,
1375 .maxlen = sizeof(vm_dirty_bytes),
1376 .mode = 0644,
1377 .proc_handler = dirty_bytes_handler,
1378 .extra1 = &dirty_bytes_min,
1379 },
1380 {
1381 .procname = "dirty_writeback_centisecs",
1382 .data = &dirty_writeback_interval,
1383 .maxlen = sizeof(dirty_writeback_interval),
1384 .mode = 0644,
1385 .proc_handler = dirty_writeback_centisecs_handler,
1386 },
1387 {
1388 .procname = "dirty_expire_centisecs",
1389 .data = &dirty_expire_interval,
1390 .maxlen = sizeof(dirty_expire_interval),
1391 .mode = 0644,
1392 .proc_handler = proc_dointvec_minmax,
1393 .extra1 = &zero,
1394 },
1395 {
1396 .procname = "dirtytime_expire_seconds",
1397 .data = &dirtytime_expire_interval,
1398 .maxlen = sizeof(dirty_expire_interval),
1399 .mode = 0644,
1400 .proc_handler = dirtytime_interval_handler,
1401 .extra1 = &zero,
1402 },
1403 {
1404 .procname = "nr_pdflush_threads",
1405 .mode = 0444 /* read-only */,
1406 .proc_handler = pdflush_proc_obsolete,
1407 },
1408 {
1409 .procname = "swappiness",
1410 .data = &vm_swappiness,
1411 .maxlen = sizeof(vm_swappiness),
1412 .mode = 0644,
1413 .proc_handler = proc_dointvec_minmax,
1414 .extra1 = &zero,
1415 .extra2 = &one_hundred,
1416 },
1417 #ifdef CONFIG_HUGETLB_PAGE
1418 {
1419 .procname = "nr_hugepages",
1420 .data = NULL,
1421 .maxlen = sizeof(unsigned long),
1422 .mode = 0644,
1423 .proc_handler = hugetlb_sysctl_handler,
1424 },
1425 #ifdef CONFIG_NUMA
1426 {
1427 .procname = "nr_hugepages_mempolicy",
1428 .data = NULL,
1429 .maxlen = sizeof(unsigned long),
1430 .mode = 0644,
1431 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
1432 },
1433 #endif
1434 {
1435 .procname = "hugetlb_shm_group",
1436 .data = &sysctl_hugetlb_shm_group,
1437 .maxlen = sizeof(gid_t),
1438 .mode = 0644,
1439 .proc_handler = proc_dointvec,
1440 },
1441 {
1442 .procname = "hugepages_treat_as_movable",
1443 .data = &hugepages_treat_as_movable,
1444 .maxlen = sizeof(int),
1445 .mode = 0644,
1446 .proc_handler = proc_dointvec,
1447 },
1448 {
1449 .procname = "nr_overcommit_hugepages",
1450 .data = NULL,
1451 .maxlen = sizeof(unsigned long),
1452 .mode = 0644,
1453 .proc_handler = hugetlb_overcommit_handler,
1454 },
1455 #endif
1456 {
1457 .procname = "lowmem_reserve_ratio",
1458 .data = &sysctl_lowmem_reserve_ratio,
1459 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
1460 .mode = 0644,
1461 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
1462 },
1463 {
1464 .procname = "drop_caches",
1465 .data = &sysctl_drop_caches,
1466 .maxlen = sizeof(int),
1467 .mode = 0644,
1468 .proc_handler = drop_caches_sysctl_handler,
1469 .extra1 = &one,
1470 .extra2 = &four,
1471 },
1472 #ifdef CONFIG_COMPACTION
1473 {
1474 .procname = "compact_memory",
1475 .data = &sysctl_compact_memory,
1476 .maxlen = sizeof(int),
1477 .mode = 0200,
1478 .proc_handler = sysctl_compaction_handler,
1479 },
1480 {
1481 .procname = "extfrag_threshold",
1482 .data = &sysctl_extfrag_threshold,
1483 .maxlen = sizeof(int),
1484 .mode = 0644,
1485 .proc_handler = sysctl_extfrag_handler,
1486 .extra1 = &min_extfrag_threshold,
1487 .extra2 = &max_extfrag_threshold,
1488 },
1489 {
1490 .procname = "compact_unevictable_allowed",
1491 .data = &sysctl_compact_unevictable_allowed,
1492 .maxlen = sizeof(int),
1493 .mode = 0644,
1494 .proc_handler = proc_dointvec,
1495 .extra1 = &zero,
1496 .extra2 = &one,
1497 },
1498
1499 #endif /* CONFIG_COMPACTION */
1500 {
1501 .procname = "min_free_kbytes",
1502 .data = &min_free_kbytes,
1503 .maxlen = sizeof(min_free_kbytes),
1504 .mode = 0644,
1505 .proc_handler = min_free_kbytes_sysctl_handler,
1506 .extra1 = &zero,
1507 },
1508 {
1509 .procname = "watermark_scale_factor",
1510 .data = &watermark_scale_factor,
1511 .maxlen = sizeof(watermark_scale_factor),
1512 .mode = 0644,
1513 .proc_handler = watermark_scale_factor_sysctl_handler,
1514 .extra1 = &one,
1515 .extra2 = &one_thousand,
1516 },
1517 {
1518 .procname = "extra_free_kbytes",
1519 .data = &extra_free_kbytes,
1520 .maxlen = sizeof(extra_free_kbytes),
1521 .mode = 0644,
1522 .proc_handler = min_free_kbytes_sysctl_handler,
1523 .extra1 = &zero,
1524 },
1525 {
1526 .procname = "percpu_pagelist_fraction",
1527 .data = &percpu_pagelist_fraction,
1528 .maxlen = sizeof(percpu_pagelist_fraction),
1529 .mode = 0644,
1530 .proc_handler = percpu_pagelist_fraction_sysctl_handler,
1531 .extra1 = &zero,
1532 },
1533 #ifdef CONFIG_MMU
1534 {
1535 .procname = "max_map_count",
1536 .data = &sysctl_max_map_count,
1537 .maxlen = sizeof(sysctl_max_map_count),
1538 .mode = 0644,
1539 .proc_handler = proc_dointvec_minmax,
1540 .extra1 = &zero,
1541 },
1542 #else
1543 {
1544 .procname = "nr_trim_pages",
1545 .data = &sysctl_nr_trim_pages,
1546 .maxlen = sizeof(sysctl_nr_trim_pages),
1547 .mode = 0644,
1548 .proc_handler = proc_dointvec_minmax,
1549 .extra1 = &zero,
1550 },
1551 #endif
1552 {
1553 .procname = "laptop_mode",
1554 .data = &laptop_mode,
1555 .maxlen = sizeof(laptop_mode),
1556 .mode = 0644,
1557 .proc_handler = proc_dointvec_jiffies,
1558 },
1559 {
1560 .procname = "block_dump",
1561 .data = &block_dump,
1562 .maxlen = sizeof(block_dump),
1563 .mode = 0644,
1564 .proc_handler = proc_dointvec,
1565 .extra1 = &zero,
1566 },
1567 {
1568 .procname = "vfs_cache_pressure",
1569 .data = &sysctl_vfs_cache_pressure,
1570 .maxlen = sizeof(sysctl_vfs_cache_pressure),
1571 .mode = 0644,
1572 .proc_handler = proc_dointvec,
1573 .extra1 = &zero,
1574 },
1575 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1576 {
1577 .procname = "legacy_va_layout",
1578 .data = &sysctl_legacy_va_layout,
1579 .maxlen = sizeof(sysctl_legacy_va_layout),
1580 .mode = 0644,
1581 .proc_handler = proc_dointvec,
1582 .extra1 = &zero,
1583 },
1584 #endif
1585 #ifdef CONFIG_NUMA
1586 {
1587 .procname = "zone_reclaim_mode",
1588 .data = &node_reclaim_mode,
1589 .maxlen = sizeof(node_reclaim_mode),
1590 .mode = 0644,
1591 .proc_handler = proc_dointvec,
1592 .extra1 = &zero,
1593 },
1594 {
1595 .procname = "min_unmapped_ratio",
1596 .data = &sysctl_min_unmapped_ratio,
1597 .maxlen = sizeof(sysctl_min_unmapped_ratio),
1598 .mode = 0644,
1599 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
1600 .extra1 = &zero,
1601 .extra2 = &one_hundred,
1602 },
1603 {
1604 .procname = "min_slab_ratio",
1605 .data = &sysctl_min_slab_ratio,
1606 .maxlen = sizeof(sysctl_min_slab_ratio),
1607 .mode = 0644,
1608 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
1609 .extra1 = &zero,
1610 .extra2 = &one_hundred,
1611 },
1612 #endif
1613 #ifdef CONFIG_SMP
1614 {
1615 .procname = "stat_interval",
1616 .data = &sysctl_stat_interval,
1617 .maxlen = sizeof(sysctl_stat_interval),
1618 .mode = 0644,
1619 .proc_handler = proc_dointvec_jiffies,
1620 },
1621 {
1622 .procname = "stat_refresh",
1623 .data = NULL,
1624 .maxlen = 0,
1625 .mode = 0600,
1626 .proc_handler = vmstat_refresh,
1627 },
1628 #endif
1629 #ifdef CONFIG_MMU
1630 {
1631 .procname = "mmap_min_addr",
1632 .data = &dac_mmap_min_addr,
1633 .maxlen = sizeof(unsigned long),
1634 .mode = 0644,
1635 .proc_handler = mmap_min_addr_handler,
1636 },
1637 #endif
1638 #ifdef CONFIG_NUMA
1639 {
1640 .procname = "numa_zonelist_order",
1641 .data = &numa_zonelist_order,
1642 .maxlen = NUMA_ZONELIST_ORDER_LEN,
1643 .mode = 0644,
1644 .proc_handler = numa_zonelist_order_handler,
1645 },
1646 #endif
1647 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1648 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1649 {
1650 .procname = "vdso_enabled",
1651 #ifdef CONFIG_X86_32
1652 .data = &vdso32_enabled,
1653 .maxlen = sizeof(vdso32_enabled),
1654 #else
1655 .data = &vdso_enabled,
1656 .maxlen = sizeof(vdso_enabled),
1657 #endif
1658 .mode = 0644,
1659 .proc_handler = proc_dointvec,
1660 .extra1 = &zero,
1661 },
1662 #endif
1663 #ifdef CONFIG_HIGHMEM
1664 {
1665 .procname = "highmem_is_dirtyable",
1666 .data = &vm_highmem_is_dirtyable,
1667 .maxlen = sizeof(vm_highmem_is_dirtyable),
1668 .mode = 0644,
1669 .proc_handler = proc_dointvec_minmax,
1670 .extra1 = &zero,
1671 .extra2 = &one,
1672 },
1673 #endif
1674 #ifdef CONFIG_MEMORY_FAILURE
1675 {
1676 .procname = "memory_failure_early_kill",
1677 .data = &sysctl_memory_failure_early_kill,
1678 .maxlen = sizeof(sysctl_memory_failure_early_kill),
1679 .mode = 0644,
1680 .proc_handler = proc_dointvec_minmax,
1681 .extra1 = &zero,
1682 .extra2 = &one,
1683 },
1684 {
1685 .procname = "memory_failure_recovery",
1686 .data = &sysctl_memory_failure_recovery,
1687 .maxlen = sizeof(sysctl_memory_failure_recovery),
1688 .mode = 0644,
1689 .proc_handler = proc_dointvec_minmax,
1690 .extra1 = &zero,
1691 .extra2 = &one,
1692 },
1693 #endif
1694 {
1695 .procname = "user_reserve_kbytes",
1696 .data = &sysctl_user_reserve_kbytes,
1697 .maxlen = sizeof(sysctl_user_reserve_kbytes),
1698 .mode = 0644,
1699 .proc_handler = proc_doulongvec_minmax,
1700 },
1701 {
1702 .procname = "admin_reserve_kbytes",
1703 .data = &sysctl_admin_reserve_kbytes,
1704 .maxlen = sizeof(sysctl_admin_reserve_kbytes),
1705 .mode = 0644,
1706 .proc_handler = proc_doulongvec_minmax,
1707 },
1708 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS
1709 {
1710 .procname = "mmap_rnd_bits",
1711 .data = &mmap_rnd_bits,
1712 .maxlen = sizeof(mmap_rnd_bits),
1713 .mode = 0600,
1714 .proc_handler = proc_dointvec_minmax,
1715 .extra1 = (void *)&mmap_rnd_bits_min,
1716 .extra2 = (void *)&mmap_rnd_bits_max,
1717 },
1718 #endif
1719 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS
1720 {
1721 .procname = "mmap_rnd_compat_bits",
1722 .data = &mmap_rnd_compat_bits,
1723 .maxlen = sizeof(mmap_rnd_compat_bits),
1724 .mode = 0600,
1725 .proc_handler = proc_dointvec_minmax,
1726 .extra1 = (void *)&mmap_rnd_compat_bits_min,
1727 .extra2 = (void *)&mmap_rnd_compat_bits_max,
1728 },
1729 #endif
1730 { }
1731 };
1732
1733 static struct ctl_table fs_table[] = {
1734 {
1735 .procname = "inode-nr",
1736 .data = &inodes_stat,
1737 .maxlen = 2*sizeof(long),
1738 .mode = 0444,
1739 .proc_handler = proc_nr_inodes,
1740 },
1741 {
1742 .procname = "inode-state",
1743 .data = &inodes_stat,
1744 .maxlen = 7*sizeof(long),
1745 .mode = 0444,
1746 .proc_handler = proc_nr_inodes,
1747 },
1748 {
1749 .procname = "file-nr",
1750 .data = &files_stat,
1751 .maxlen = sizeof(files_stat),
1752 .mode = 0444,
1753 .proc_handler = proc_nr_files,
1754 },
1755 {
1756 .procname = "file-max",
1757 .data = &files_stat.max_files,
1758 .maxlen = sizeof(files_stat.max_files),
1759 .mode = 0644,
1760 .proc_handler = proc_doulongvec_minmax,
1761 .extra1 = &zero,
1762 .extra2 = &long_max,
1763 },
1764 {
1765 .procname = "nr_open",
1766 .data = &sysctl_nr_open,
1767 .maxlen = sizeof(unsigned int),
1768 .mode = 0644,
1769 .proc_handler = proc_dointvec_minmax,
1770 .extra1 = &sysctl_nr_open_min,
1771 .extra2 = &sysctl_nr_open_max,
1772 },
1773 {
1774 .procname = "dentry-state",
1775 .data = &dentry_stat,
1776 .maxlen = 6*sizeof(long),
1777 .mode = 0444,
1778 .proc_handler = proc_nr_dentry,
1779 },
1780 {
1781 .procname = "overflowuid",
1782 .data = &fs_overflowuid,
1783 .maxlen = sizeof(int),
1784 .mode = 0644,
1785 .proc_handler = proc_dointvec_minmax,
1786 .extra1 = &minolduid,
1787 .extra2 = &maxolduid,
1788 },
1789 {
1790 .procname = "overflowgid",
1791 .data = &fs_overflowgid,
1792 .maxlen = sizeof(int),
1793 .mode = 0644,
1794 .proc_handler = proc_dointvec_minmax,
1795 .extra1 = &minolduid,
1796 .extra2 = &maxolduid,
1797 },
1798 #ifdef CONFIG_FILE_LOCKING
1799 {
1800 .procname = "leases-enable",
1801 .data = &leases_enable,
1802 .maxlen = sizeof(int),
1803 .mode = 0644,
1804 .proc_handler = proc_dointvec,
1805 },
1806 #endif
1807 #ifdef CONFIG_DNOTIFY
1808 {
1809 .procname = "dir-notify-enable",
1810 .data = &dir_notify_enable,
1811 .maxlen = sizeof(int),
1812 .mode = 0644,
1813 .proc_handler = proc_dointvec,
1814 },
1815 #endif
1816 #ifdef CONFIG_MMU
1817 #ifdef CONFIG_FILE_LOCKING
1818 {
1819 .procname = "lease-break-time",
1820 .data = &lease_break_time,
1821 .maxlen = sizeof(int),
1822 .mode = 0644,
1823 .proc_handler = proc_dointvec,
1824 },
1825 #endif
1826 #ifdef CONFIG_AIO
1827 {
1828 .procname = "aio-nr",
1829 .data = &aio_nr,
1830 .maxlen = sizeof(aio_nr),
1831 .mode = 0444,
1832 .proc_handler = proc_doulongvec_minmax,
1833 },
1834 {
1835 .procname = "aio-max-nr",
1836 .data = &aio_max_nr,
1837 .maxlen = sizeof(aio_max_nr),
1838 .mode = 0644,
1839 .proc_handler = proc_doulongvec_minmax,
1840 },
1841 #endif /* CONFIG_AIO */
1842 #ifdef CONFIG_INOTIFY_USER
1843 {
1844 .procname = "inotify",
1845 .mode = 0555,
1846 .child = inotify_table,
1847 },
1848 #endif
1849 #ifdef CONFIG_EPOLL
1850 {
1851 .procname = "epoll",
1852 .mode = 0555,
1853 .child = epoll_table,
1854 },
1855 #endif
1856 #endif
1857 {
1858 .procname = "protected_symlinks",
1859 .data = &sysctl_protected_symlinks,
1860 .maxlen = sizeof(int),
1861 .mode = 0600,
1862 .proc_handler = proc_dointvec_minmax,
1863 .extra1 = &zero,
1864 .extra2 = &one,
1865 },
1866 {
1867 .procname = "protected_hardlinks",
1868 .data = &sysctl_protected_hardlinks,
1869 .maxlen = sizeof(int),
1870 .mode = 0600,
1871 .proc_handler = proc_dointvec_minmax,
1872 .extra1 = &zero,
1873 .extra2 = &one,
1874 },
1875 {
1876 .procname = "protected_fifos",
1877 .data = &sysctl_protected_fifos,
1878 .maxlen = sizeof(int),
1879 .mode = 0600,
1880 .proc_handler = proc_dointvec_minmax,
1881 .extra1 = &zero,
1882 .extra2 = &two,
1883 },
1884 {
1885 .procname = "protected_regular",
1886 .data = &sysctl_protected_regular,
1887 .maxlen = sizeof(int),
1888 .mode = 0600,
1889 .proc_handler = proc_dointvec_minmax,
1890 .extra1 = &zero,
1891 .extra2 = &two,
1892 },
1893 {
1894 .procname = "suid_dumpable",
1895 .data = &suid_dumpable,
1896 .maxlen = sizeof(int),
1897 .mode = 0644,
1898 .proc_handler = proc_dointvec_minmax_coredump,
1899 .extra1 = &zero,
1900 .extra2 = &two,
1901 },
1902 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1903 {
1904 .procname = "binfmt_misc",
1905 .mode = 0555,
1906 .child = sysctl_mount_point,
1907 },
1908 #endif
1909 {
1910 .procname = "pipe-max-size",
1911 .data = &pipe_max_size,
1912 .maxlen = sizeof(pipe_max_size),
1913 .mode = 0644,
1914 .proc_handler = &pipe_proc_fn,
1915 .extra1 = &pipe_min_size,
1916 },
1917 {
1918 .procname = "pipe-user-pages-hard",
1919 .data = &pipe_user_pages_hard,
1920 .maxlen = sizeof(pipe_user_pages_hard),
1921 .mode = 0644,
1922 .proc_handler = proc_doulongvec_minmax,
1923 },
1924 {
1925 .procname = "pipe-user-pages-soft",
1926 .data = &pipe_user_pages_soft,
1927 .maxlen = sizeof(pipe_user_pages_soft),
1928 .mode = 0644,
1929 .proc_handler = proc_doulongvec_minmax,
1930 },
1931 {
1932 .procname = "mount-max",
1933 .data = &sysctl_mount_max,
1934 .maxlen = sizeof(unsigned int),
1935 .mode = 0644,
1936 .proc_handler = proc_dointvec_minmax,
1937 .extra1 = &one,
1938 },
1939 { }
1940 };
1941
1942 static struct ctl_table debug_table[] = {
1943 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1944 {
1945 .procname = "exception-trace",
1946 .data = &show_unhandled_signals,
1947 .maxlen = sizeof(int),
1948 .mode = 0644,
1949 .proc_handler = proc_dointvec
1950 },
1951 #endif
1952 #if defined(CONFIG_OPTPROBES)
1953 {
1954 .procname = "kprobes-optimization",
1955 .data = &sysctl_kprobes_optimization,
1956 .maxlen = sizeof(int),
1957 .mode = 0644,
1958 .proc_handler = proc_kprobes_optimization_handler,
1959 .extra1 = &zero,
1960 .extra2 = &one,
1961 },
1962 #endif
1963 { }
1964 };
1965
1966 static struct ctl_table dev_table[] = {
1967 { }
1968 };
1969
1970 int __init sysctl_init(void)
1971 {
1972 struct ctl_table_header *hdr;
1973
1974 hdr = register_sysctl_table(sysctl_base_table);
1975 kmemleak_not_leak(hdr);
1976 return 0;
1977 }
1978
1979 #endif /* CONFIG_SYSCTL */
1980
1981 /*
1982 * /proc/sys support
1983 */
1984
1985 #ifdef CONFIG_PROC_SYSCTL
1986
1987 static int _proc_do_string(char *data, int maxlen, int write,
1988 char __user *buffer,
1989 size_t *lenp, loff_t *ppos)
1990 {
1991 size_t len;
1992 char __user *p;
1993 char c;
1994
1995 if (!data || !maxlen || !*lenp) {
1996 *lenp = 0;
1997 return 0;
1998 }
1999
2000 if (write) {
2001 if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) {
2002 /* Only continue writes not past the end of buffer. */
2003 len = strlen(data);
2004 if (len > maxlen - 1)
2005 len = maxlen - 1;
2006
2007 if (*ppos > len)
2008 return 0;
2009 len = *ppos;
2010 } else {
2011 /* Start writing from beginning of buffer. */
2012 len = 0;
2013 }
2014
2015 *ppos += *lenp;
2016 p = buffer;
2017 while ((p - buffer) < *lenp && len < maxlen - 1) {
2018 if (get_user(c, p++))
2019 return -EFAULT;
2020 if (c == 0 || c == '\n')
2021 break;
2022 data[len++] = c;
2023 }
2024 data[len] = 0;
2025 } else {
2026 len = strlen(data);
2027 if (len > maxlen)
2028 len = maxlen;
2029
2030 if (*ppos > len) {
2031 *lenp = 0;
2032 return 0;
2033 }
2034
2035 data += *ppos;
2036 len -= *ppos;
2037
2038 if (len > *lenp)
2039 len = *lenp;
2040 if (len)
2041 if (copy_to_user(buffer, data, len))
2042 return -EFAULT;
2043 if (len < *lenp) {
2044 if (put_user('\n', buffer + len))
2045 return -EFAULT;
2046 len++;
2047 }
2048 *lenp = len;
2049 *ppos += len;
2050 }
2051 return 0;
2052 }
2053
2054 static void warn_sysctl_write(struct ctl_table *table)
2055 {
2056 pr_warn_once("%s wrote to %s when file position was not 0!\n"
2057 "This will not be supported in the future. To silence this\n"
2058 "warning, set kernel.sysctl_writes_strict = -1\n",
2059 current->comm, table->procname);
2060 }
2061
2062 /**
2063 * proc_first_pos_non_zero_ignore - check if firs position is allowed
2064 * @ppos: file position
2065 * @table: the sysctl table
2066 *
2067 * Returns true if the first position is non-zero and the sysctl_writes_strict
2068 * mode indicates this is not allowed for numeric input types. String proc
2069 * hadlers can ignore the return value.
2070 */
2071 static bool proc_first_pos_non_zero_ignore(loff_t *ppos,
2072 struct ctl_table *table)
2073 {
2074 if (!*ppos)
2075 return false;
2076
2077 switch (sysctl_writes_strict) {
2078 case SYSCTL_WRITES_STRICT:
2079 return true;
2080 case SYSCTL_WRITES_WARN:
2081 warn_sysctl_write(table);
2082 return false;
2083 default:
2084 return false;
2085 }
2086 }
2087
2088 /**
2089 * proc_dostring - read a string sysctl
2090 * @table: the sysctl table
2091 * @write: %TRUE if this is a write to the sysctl file
2092 * @buffer: the user buffer
2093 * @lenp: the size of the user buffer
2094 * @ppos: file position
2095 *
2096 * Reads/writes a string from/to the user buffer. If the kernel
2097 * buffer provided is not large enough to hold the string, the
2098 * string is truncated. The copied string is %NULL-terminated.
2099 * If the string is being read by the user process, it is copied
2100 * and a newline '\n' is added. It is truncated if the buffer is
2101 * not large enough.
2102 *
2103 * Returns 0 on success.
2104 */
2105 int proc_dostring(struct ctl_table *table, int write,
2106 void __user *buffer, size_t *lenp, loff_t *ppos)
2107 {
2108 if (write)
2109 proc_first_pos_non_zero_ignore(ppos, table);
2110
2111 return _proc_do_string((char *)(table->data), table->maxlen, write,
2112 (char __user *)buffer, lenp, ppos);
2113 }
2114
2115 static size_t proc_skip_spaces(char **buf)
2116 {
2117 size_t ret;
2118 char *tmp = skip_spaces(*buf);
2119 ret = tmp - *buf;
2120 *buf = tmp;
2121 return ret;
2122 }
2123
2124 static void proc_skip_char(char **buf, size_t *size, const char v)
2125 {
2126 while (*size) {
2127 if (**buf != v)
2128 break;
2129 (*size)--;
2130 (*buf)++;
2131 }
2132 }
2133
2134 #define TMPBUFLEN 22
2135 /**
2136 * proc_get_long - reads an ASCII formatted integer from a user buffer
2137 *
2138 * @buf: a kernel buffer
2139 * @size: size of the kernel buffer
2140 * @val: this is where the number will be stored
2141 * @neg: set to %TRUE if number is negative
2142 * @perm_tr: a vector which contains the allowed trailers
2143 * @perm_tr_len: size of the perm_tr vector
2144 * @tr: pointer to store the trailer character
2145 *
2146 * In case of success %0 is returned and @buf and @size are updated with
2147 * the amount of bytes read. If @tr is non-NULL and a trailing
2148 * character exists (size is non-zero after returning from this
2149 * function), @tr is updated with the trailing character.
2150 */
2151 static int proc_get_long(char **buf, size_t *size,
2152 unsigned long *val, bool *neg,
2153 const char *perm_tr, unsigned perm_tr_len, char *tr)
2154 {
2155 int len;
2156 char *p, tmp[TMPBUFLEN];
2157
2158 if (!*size)
2159 return -EINVAL;
2160
2161 len = *size;
2162 if (len > TMPBUFLEN - 1)
2163 len = TMPBUFLEN - 1;
2164
2165 memcpy(tmp, *buf, len);
2166
2167 tmp[len] = 0;
2168 p = tmp;
2169 if (*p == '-' && *size > 1) {
2170 *neg = true;
2171 p++;
2172 } else
2173 *neg = false;
2174 if (!isdigit(*p))
2175 return -EINVAL;
2176
2177 *val = simple_strtoul(p, &p, 0);
2178
2179 len = p - tmp;
2180
2181 /* We don't know if the next char is whitespace thus we may accept
2182 * invalid integers (e.g. 1234...a) or two integers instead of one
2183 * (e.g. 123...1). So lets not allow such large numbers. */
2184 if (len == TMPBUFLEN - 1)
2185 return -EINVAL;
2186
2187 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
2188 return -EINVAL;
2189
2190 if (tr && (len < *size))
2191 *tr = *p;
2192
2193 *buf += len;
2194 *size -= len;
2195
2196 return 0;
2197 }
2198
2199 /**
2200 * proc_put_long - converts an integer to a decimal ASCII formatted string
2201 *
2202 * @buf: the user buffer
2203 * @size: the size of the user buffer
2204 * @val: the integer to be converted
2205 * @neg: sign of the number, %TRUE for negative
2206 *
2207 * In case of success %0 is returned and @buf and @size are updated with
2208 * the amount of bytes written.
2209 */
2210 static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
2211 bool neg)
2212 {
2213 int len;
2214 char tmp[TMPBUFLEN], *p = tmp;
2215
2216 sprintf(p, "%s%lu", neg ? "-" : "", val);
2217 len = strlen(tmp);
2218 if (len > *size)
2219 len = *size;
2220 if (copy_to_user(*buf, tmp, len))
2221 return -EFAULT;
2222 *size -= len;
2223 *buf += len;
2224 return 0;
2225 }
2226 #undef TMPBUFLEN
2227
2228 static int proc_put_char(void __user **buf, size_t *size, char c)
2229 {
2230 if (*size) {
2231 char __user **buffer = (char __user **)buf;
2232 if (put_user(c, *buffer))
2233 return -EFAULT;
2234 (*size)--, (*buffer)++;
2235 *buf = *buffer;
2236 }
2237 return 0;
2238 }
2239
2240 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
2241 int *valp,
2242 int write, void *data)
2243 {
2244 if (write) {
2245 if (*negp) {
2246 if (*lvalp > (unsigned long) INT_MAX + 1)
2247 return -EINVAL;
2248 *valp = -*lvalp;
2249 } else {
2250 if (*lvalp > (unsigned long) INT_MAX)
2251 return -EINVAL;
2252 *valp = *lvalp;
2253 }
2254 } else {
2255 int val = *valp;
2256 if (val < 0) {
2257 *negp = true;
2258 *lvalp = -(unsigned long)val;
2259 } else {
2260 *negp = false;
2261 *lvalp = (unsigned long)val;
2262 }
2263 }
2264 return 0;
2265 }
2266
2267 static int do_proc_douintvec_conv(unsigned long *lvalp,
2268 unsigned int *valp,
2269 int write, void *data)
2270 {
2271 if (write) {
2272 if (*lvalp > UINT_MAX)
2273 return -EINVAL;
2274 *valp = *lvalp;
2275 } else {
2276 unsigned int val = *valp;
2277 *lvalp = (unsigned long)val;
2278 }
2279 return 0;
2280 }
2281
2282 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
2283
2284 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
2285 int write, void __user *buffer,
2286 size_t *lenp, loff_t *ppos,
2287 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2288 int write, void *data),
2289 void *data)
2290 {
2291 int *i, vleft, first = 1, err = 0;
2292 size_t left;
2293 char *kbuf = NULL, *p;
2294
2295 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
2296 *lenp = 0;
2297 return 0;
2298 }
2299
2300 i = (int *) tbl_data;
2301 vleft = table->maxlen / sizeof(*i);
2302 left = *lenp;
2303
2304 if (!conv)
2305 conv = do_proc_dointvec_conv;
2306
2307 if (write) {
2308 if (proc_first_pos_non_zero_ignore(ppos, table))
2309 goto out;
2310
2311 if (left > PAGE_SIZE - 1)
2312 left = PAGE_SIZE - 1;
2313 p = kbuf = memdup_user_nul(buffer, left);
2314 if (IS_ERR(kbuf))
2315 return PTR_ERR(kbuf);
2316 }
2317
2318 for (; left && vleft--; i++, first=0) {
2319 unsigned long lval;
2320 bool neg;
2321
2322 if (write) {
2323 left -= proc_skip_spaces(&p);
2324
2325 if (!left)
2326 break;
2327 err = proc_get_long(&p, &left, &lval, &neg,
2328 proc_wspace_sep,
2329 sizeof(proc_wspace_sep), NULL);
2330 if (err)
2331 break;
2332 if (conv(&neg, &lval, i, 1, data)) {
2333 err = -EINVAL;
2334 break;
2335 }
2336 } else {
2337 if (conv(&neg, &lval, i, 0, data)) {
2338 err = -EINVAL;
2339 break;
2340 }
2341 if (!first)
2342 err = proc_put_char(&buffer, &left, '\t');
2343 if (err)
2344 break;
2345 err = proc_put_long(&buffer, &left, lval, neg);
2346 if (err)
2347 break;
2348 }
2349 }
2350
2351 if (!write && !first && left && !err)
2352 err = proc_put_char(&buffer, &left, '\n');
2353 if (write && !err && left)
2354 left -= proc_skip_spaces(&p);
2355 if (write) {
2356 kfree(kbuf);
2357 if (first)
2358 return err ? : -EINVAL;
2359 }
2360 *lenp -= left;
2361 out:
2362 *ppos += *lenp;
2363 return err;
2364 }
2365
2366 static int do_proc_dointvec(struct ctl_table *table, int write,
2367 void __user *buffer, size_t *lenp, loff_t *ppos,
2368 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2369 int write, void *data),
2370 void *data)
2371 {
2372 return __do_proc_dointvec(table->data, table, write,
2373 buffer, lenp, ppos, conv, data);
2374 }
2375
2376 static int do_proc_douintvec_w(unsigned int *tbl_data,
2377 struct ctl_table *table,
2378 void __user *buffer,
2379 size_t *lenp, loff_t *ppos,
2380 int (*conv)(unsigned long *lvalp,
2381 unsigned int *valp,
2382 int write, void *data),
2383 void *data)
2384 {
2385 unsigned long lval;
2386 int err = 0;
2387 size_t left;
2388 bool neg;
2389 char *kbuf = NULL, *p;
2390
2391 left = *lenp;
2392
2393 if (proc_first_pos_non_zero_ignore(ppos, table))
2394 goto bail_early;
2395
2396 if (left > PAGE_SIZE - 1)
2397 left = PAGE_SIZE - 1;
2398
2399 p = kbuf = memdup_user_nul(buffer, left);
2400 if (IS_ERR(kbuf))
2401 return -EINVAL;
2402
2403 left -= proc_skip_spaces(&p);
2404 if (!left) {
2405 err = -EINVAL;
2406 goto out_free;
2407 }
2408
2409 err = proc_get_long(&p, &left, &lval, &neg,
2410 proc_wspace_sep,
2411 sizeof(proc_wspace_sep), NULL);
2412 if (err || neg) {
2413 err = -EINVAL;
2414 goto out_free;
2415 }
2416
2417 if (conv(&lval, tbl_data, 1, data)) {
2418 err = -EINVAL;
2419 goto out_free;
2420 }
2421
2422 if (!err && left)
2423 left -= proc_skip_spaces(&p);
2424
2425 out_free:
2426 kfree(kbuf);
2427 if (err)
2428 return -EINVAL;
2429
2430 return 0;
2431
2432 /* This is in keeping with old __do_proc_dointvec() */
2433 bail_early:
2434 *ppos += *lenp;
2435 return err;
2436 }
2437
2438 static int do_proc_douintvec_r(unsigned int *tbl_data, void __user *buffer,
2439 size_t *lenp, loff_t *ppos,
2440 int (*conv)(unsigned long *lvalp,
2441 unsigned int *valp,
2442 int write, void *data),
2443 void *data)
2444 {
2445 unsigned long lval;
2446 int err = 0;
2447 size_t left;
2448
2449 left = *lenp;
2450
2451 if (conv(&lval, tbl_data, 0, data)) {
2452 err = -EINVAL;
2453 goto out;
2454 }
2455
2456 err = proc_put_long(&buffer, &left, lval, false);
2457 if (err || !left)
2458 goto out;
2459
2460 err = proc_put_char(&buffer, &left, '\n');
2461
2462 out:
2463 *lenp -= left;
2464 *ppos += *lenp;
2465
2466 return err;
2467 }
2468
2469 static int __do_proc_douintvec(void *tbl_data, struct ctl_table *table,
2470 int write, void __user *buffer,
2471 size_t *lenp, loff_t *ppos,
2472 int (*conv)(unsigned long *lvalp,
2473 unsigned int *valp,
2474 int write, void *data),
2475 void *data)
2476 {
2477 unsigned int *i, vleft;
2478
2479 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
2480 *lenp = 0;
2481 return 0;
2482 }
2483
2484 i = (unsigned int *) tbl_data;
2485 vleft = table->maxlen / sizeof(*i);
2486
2487 /*
2488 * Arrays are not supported, keep this simple. *Do not* add
2489 * support for them.
2490 */
2491 if (vleft != 1) {
2492 *lenp = 0;
2493 return -EINVAL;
2494 }
2495
2496 if (!conv)
2497 conv = do_proc_douintvec_conv;
2498
2499 if (write)
2500 return do_proc_douintvec_w(i, table, buffer, lenp, ppos,
2501 conv, data);
2502 return do_proc_douintvec_r(i, buffer, lenp, ppos, conv, data);
2503 }
2504
2505 static int do_proc_douintvec(struct ctl_table *table, int write,
2506 void __user *buffer, size_t *lenp, loff_t *ppos,
2507 int (*conv)(unsigned long *lvalp,
2508 unsigned int *valp,
2509 int write, void *data),
2510 void *data)
2511 {
2512 return __do_proc_douintvec(table->data, table, write,
2513 buffer, lenp, ppos, conv, data);
2514 }
2515
2516 /**
2517 * proc_dointvec - read a vector of integers
2518 * @table: the sysctl table
2519 * @write: %TRUE if this is a write to the sysctl file
2520 * @buffer: the user buffer
2521 * @lenp: the size of the user buffer
2522 * @ppos: file position
2523 *
2524 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2525 * values from/to the user buffer, treated as an ASCII string.
2526 *
2527 * Returns 0 on success.
2528 */
2529 int proc_dointvec(struct ctl_table *table, int write,
2530 void __user *buffer, size_t *lenp, loff_t *ppos)
2531 {
2532 return do_proc_dointvec(table, write, buffer, lenp, ppos, NULL, NULL);
2533 }
2534
2535 /**
2536 * proc_douintvec - read a vector of unsigned integers
2537 * @table: the sysctl table
2538 * @write: %TRUE if this is a write to the sysctl file
2539 * @buffer: the user buffer
2540 * @lenp: the size of the user buffer
2541 * @ppos: file position
2542 *
2543 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
2544 * values from/to the user buffer, treated as an ASCII string.
2545 *
2546 * Returns 0 on success.
2547 */
2548 int proc_douintvec(struct ctl_table *table, int write,
2549 void __user *buffer, size_t *lenp, loff_t *ppos)
2550 {
2551 return do_proc_douintvec(table, write, buffer, lenp, ppos,
2552 do_proc_douintvec_conv, NULL);
2553 }
2554
2555 /*
2556 * Taint values can only be increased
2557 * This means we can safely use a temporary.
2558 */
2559 static int proc_taint(struct ctl_table *table, int write,
2560 void __user *buffer, size_t *lenp, loff_t *ppos)
2561 {
2562 struct ctl_table t;
2563 unsigned long tmptaint = get_taint();
2564 int err;
2565
2566 if (write && !capable(CAP_SYS_ADMIN))
2567 return -EPERM;
2568
2569 t = *table;
2570 t.data = &tmptaint;
2571 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2572 if (err < 0)
2573 return err;
2574
2575 if (write) {
2576 /*
2577 * Poor man's atomic or. Not worth adding a primitive
2578 * to everyone's atomic.h for this
2579 */
2580 int i;
2581 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2582 if ((tmptaint >> i) & 1)
2583 add_taint(i, LOCKDEP_STILL_OK);
2584 }
2585 }
2586
2587 return err;
2588 }
2589
2590 #ifdef CONFIG_PRINTK
2591 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
2592 void __user *buffer, size_t *lenp, loff_t *ppos)
2593 {
2594 if (write && !capable(CAP_SYS_ADMIN))
2595 return -EPERM;
2596
2597 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2598 }
2599 #endif
2600
2601 struct do_proc_dointvec_minmax_conv_param {
2602 int *min;
2603 int *max;
2604 };
2605
2606 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2607 int *valp,
2608 int write, void *data)
2609 {
2610 struct do_proc_dointvec_minmax_conv_param *param = data;
2611 if (write) {
2612 int val;
2613 if (*negp) {
2614 if (*lvalp > (unsigned long) INT_MAX + 1)
2615 return -EINVAL;
2616 val = -*lvalp;
2617 } else {
2618 if (*lvalp > (unsigned long) INT_MAX)
2619 return -EINVAL;
2620 val = *lvalp;
2621 }
2622 if ((param->min && *param->min > val) ||
2623 (param->max && *param->max < val))
2624 return -EINVAL;
2625 *valp = val;
2626 } else {
2627 int val = *valp;
2628 if (val < 0) {
2629 *negp = true;
2630 *lvalp = -(unsigned long)val;
2631 } else {
2632 *negp = false;
2633 *lvalp = (unsigned long)val;
2634 }
2635 }
2636 return 0;
2637 }
2638
2639 /**
2640 * proc_dointvec_minmax - read a vector of integers 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) integer
2648 * values from/to the user buffer, treated as an ASCII string.
2649 *
2650 * This routine will ensure the values are within the range specified by
2651 * table->extra1 (min) and table->extra2 (max).
2652 *
2653 * Returns 0 on success.
2654 */
2655 int proc_dointvec_minmax(struct ctl_table *table, int write,
2656 void __user *buffer, size_t *lenp, loff_t *ppos)
2657 {
2658 struct do_proc_dointvec_minmax_conv_param param = {
2659 .min = (int *) table->extra1,
2660 .max = (int *) table->extra2,
2661 };
2662 return do_proc_dointvec(table, write, buffer, lenp, ppos,
2663 do_proc_dointvec_minmax_conv, &param);
2664 }
2665
2666 struct do_proc_douintvec_minmax_conv_param {
2667 unsigned int *min;
2668 unsigned int *max;
2669 };
2670
2671 static int do_proc_douintvec_minmax_conv(unsigned long *lvalp,
2672 unsigned int *valp,
2673 int write, void *data)
2674 {
2675 struct do_proc_douintvec_minmax_conv_param *param = data;
2676
2677 if (write) {
2678 unsigned int val = *lvalp;
2679
2680 if ((param->min && *param->min > val) ||
2681 (param->max && *param->max < val))
2682 return -ERANGE;
2683
2684 if (*lvalp > UINT_MAX)
2685 return -EINVAL;
2686 *valp = val;
2687 } else {
2688 unsigned int val = *valp;
2689 *lvalp = (unsigned long) val;
2690 }
2691
2692 return 0;
2693 }
2694
2695 /**
2696 * proc_douintvec_minmax - read a vector of unsigned ints with min/max values
2697 * @table: the sysctl table
2698 * @write: %TRUE if this is a write to the sysctl file
2699 * @buffer: the user buffer
2700 * @lenp: the size of the user buffer
2701 * @ppos: file position
2702 *
2703 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
2704 * values from/to the user buffer, treated as an ASCII string. Negative
2705 * strings are not allowed.
2706 *
2707 * This routine will ensure the values are within the range specified by
2708 * table->extra1 (min) and table->extra2 (max). There is a final sanity
2709 * check for UINT_MAX to avoid having to support wrap around uses from
2710 * userspace.
2711 *
2712 * Returns 0 on success.
2713 */
2714 int proc_douintvec_minmax(struct ctl_table *table, int write,
2715 void __user *buffer, size_t *lenp, loff_t *ppos)
2716 {
2717 struct do_proc_douintvec_minmax_conv_param param = {
2718 .min = (unsigned int *) table->extra1,
2719 .max = (unsigned int *) table->extra2,
2720 };
2721 return do_proc_douintvec(table, write, buffer, lenp, ppos,
2722 do_proc_douintvec_minmax_conv, &param);
2723 }
2724
2725 static void validate_coredump_safety(void)
2726 {
2727 #ifdef CONFIG_COREDUMP
2728 if (suid_dumpable == SUID_DUMP_ROOT &&
2729 core_pattern[0] != '/' && core_pattern[0] != '|') {
2730 printk(KERN_WARNING
2731 "Unsafe core_pattern used with fs.suid_dumpable=2.\n"
2732 "Pipe handler or fully qualified core dump path required.\n"
2733 "Set kernel.core_pattern before fs.suid_dumpable.\n"
2734 );
2735 }
2736 #endif
2737 }
2738
2739 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2740 void __user *buffer, size_t *lenp, loff_t *ppos)
2741 {
2742 int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2743 if (!error)
2744 validate_coredump_safety();
2745 return error;
2746 }
2747
2748 #ifdef CONFIG_COREDUMP
2749 static int proc_dostring_coredump(struct ctl_table *table, int write,
2750 void __user *buffer, size_t *lenp, loff_t *ppos)
2751 {
2752 int error = proc_dostring(table, write, buffer, lenp, ppos);
2753 if (!error)
2754 validate_coredump_safety();
2755 return error;
2756 }
2757 #endif
2758
2759 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2760 void __user *buffer,
2761 size_t *lenp, loff_t *ppos,
2762 unsigned long convmul,
2763 unsigned long convdiv)
2764 {
2765 unsigned long *i, *min, *max;
2766 int vleft, first = 1, err = 0;
2767 size_t left;
2768 char *kbuf = NULL, *p;
2769
2770 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2771 *lenp = 0;
2772 return 0;
2773 }
2774
2775 i = (unsigned long *) data;
2776 min = (unsigned long *) table->extra1;
2777 max = (unsigned long *) table->extra2;
2778 vleft = table->maxlen / sizeof(unsigned long);
2779 left = *lenp;
2780
2781 if (write) {
2782 if (proc_first_pos_non_zero_ignore(ppos, table))
2783 goto out;
2784
2785 if (left > PAGE_SIZE - 1)
2786 left = PAGE_SIZE - 1;
2787 p = kbuf = memdup_user_nul(buffer, left);
2788 if (IS_ERR(kbuf))
2789 return PTR_ERR(kbuf);
2790 }
2791
2792 for (; left && vleft--; i++, first = 0) {
2793 unsigned long val;
2794
2795 if (write) {
2796 bool neg;
2797
2798 left -= proc_skip_spaces(&p);
2799 if (!left)
2800 break;
2801
2802 err = proc_get_long(&p, &left, &val, &neg,
2803 proc_wspace_sep,
2804 sizeof(proc_wspace_sep), NULL);
2805 if (err)
2806 break;
2807 if (neg)
2808 continue;
2809 val = convmul * val / convdiv;
2810 if ((min && val < *min) || (max && val > *max))
2811 continue;
2812 *i = val;
2813 } else {
2814 val = convdiv * (*i) / convmul;
2815 if (!first) {
2816 err = proc_put_char(&buffer, &left, '\t');
2817 if (err)
2818 break;
2819 }
2820 err = proc_put_long(&buffer, &left, val, false);
2821 if (err)
2822 break;
2823 }
2824 }
2825
2826 if (!write && !first && left && !err)
2827 err = proc_put_char(&buffer, &left, '\n');
2828 if (write && !err)
2829 left -= proc_skip_spaces(&p);
2830 if (write) {
2831 kfree(kbuf);
2832 if (first)
2833 return err ? : -EINVAL;
2834 }
2835 *lenp -= left;
2836 out:
2837 *ppos += *lenp;
2838 return err;
2839 }
2840
2841 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2842 void __user *buffer,
2843 size_t *lenp, loff_t *ppos,
2844 unsigned long convmul,
2845 unsigned long convdiv)
2846 {
2847 return __do_proc_doulongvec_minmax(table->data, table, write,
2848 buffer, lenp, ppos, convmul, convdiv);
2849 }
2850
2851 /**
2852 * proc_doulongvec_minmax - read a vector of long integers with min/max values
2853 * @table: the sysctl table
2854 * @write: %TRUE if this is a write to the sysctl file
2855 * @buffer: the user buffer
2856 * @lenp: the size of the user buffer
2857 * @ppos: file position
2858 *
2859 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2860 * values from/to the user buffer, treated as an ASCII string.
2861 *
2862 * This routine will ensure the values are within the range specified by
2863 * table->extra1 (min) and table->extra2 (max).
2864 *
2865 * Returns 0 on success.
2866 */
2867 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2868 void __user *buffer, size_t *lenp, loff_t *ppos)
2869 {
2870 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2871 }
2872
2873 /**
2874 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2875 * @table: the sysctl table
2876 * @write: %TRUE if this is a write to the sysctl file
2877 * @buffer: the user buffer
2878 * @lenp: the size of the user buffer
2879 * @ppos: file position
2880 *
2881 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2882 * values from/to the user buffer, treated as an ASCII string. The values
2883 * are treated as milliseconds, and converted to jiffies when they are stored.
2884 *
2885 * This routine will ensure the values are within the range specified by
2886 * table->extra1 (min) and table->extra2 (max).
2887 *
2888 * Returns 0 on success.
2889 */
2890 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2891 void __user *buffer,
2892 size_t *lenp, loff_t *ppos)
2893 {
2894 return do_proc_doulongvec_minmax(table, write, buffer,
2895 lenp, ppos, HZ, 1000l);
2896 }
2897
2898
2899 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2900 int *valp,
2901 int write, void *data)
2902 {
2903 if (write) {
2904 if (*lvalp > INT_MAX / HZ)
2905 return 1;
2906 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2907 } else {
2908 int val = *valp;
2909 unsigned long lval;
2910 if (val < 0) {
2911 *negp = true;
2912 lval = -(unsigned long)val;
2913 } else {
2914 *negp = false;
2915 lval = (unsigned long)val;
2916 }
2917 *lvalp = lval / HZ;
2918 }
2919 return 0;
2920 }
2921
2922 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2923 int *valp,
2924 int write, void *data)
2925 {
2926 if (write) {
2927 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2928 return 1;
2929 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2930 } else {
2931 int val = *valp;
2932 unsigned long lval;
2933 if (val < 0) {
2934 *negp = true;
2935 lval = -(unsigned long)val;
2936 } else {
2937 *negp = false;
2938 lval = (unsigned long)val;
2939 }
2940 *lvalp = jiffies_to_clock_t(lval);
2941 }
2942 return 0;
2943 }
2944
2945 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2946 int *valp,
2947 int write, void *data)
2948 {
2949 if (write) {
2950 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2951
2952 if (jif > INT_MAX)
2953 return 1;
2954 *valp = (int)jif;
2955 } else {
2956 int val = *valp;
2957 unsigned long lval;
2958 if (val < 0) {
2959 *negp = true;
2960 lval = -(unsigned long)val;
2961 } else {
2962 *negp = false;
2963 lval = (unsigned long)val;
2964 }
2965 *lvalp = jiffies_to_msecs(lval);
2966 }
2967 return 0;
2968 }
2969
2970 /**
2971 * proc_dointvec_jiffies - read a vector of integers as seconds
2972 * @table: the sysctl table
2973 * @write: %TRUE if this is a write to the sysctl file
2974 * @buffer: the user buffer
2975 * @lenp: the size of the user buffer
2976 * @ppos: file position
2977 *
2978 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2979 * values from/to the user buffer, treated as an ASCII string.
2980 * The values read are assumed to be in seconds, and are converted into
2981 * jiffies.
2982 *
2983 * Returns 0 on success.
2984 */
2985 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2986 void __user *buffer, size_t *lenp, loff_t *ppos)
2987 {
2988 return do_proc_dointvec(table,write,buffer,lenp,ppos,
2989 do_proc_dointvec_jiffies_conv,NULL);
2990 }
2991
2992 /**
2993 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2994 * @table: the sysctl table
2995 * @write: %TRUE if this is a write to the sysctl file
2996 * @buffer: the user buffer
2997 * @lenp: the size of the user buffer
2998 * @ppos: pointer to the file position
2999 *
3000 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
3001 * values from/to the user buffer, treated as an ASCII string.
3002 * The values read are assumed to be in 1/USER_HZ seconds, and
3003 * are converted into jiffies.
3004 *
3005 * Returns 0 on success.
3006 */
3007 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
3008 void __user *buffer, size_t *lenp, loff_t *ppos)
3009 {
3010 return do_proc_dointvec(table,write,buffer,lenp,ppos,
3011 do_proc_dointvec_userhz_jiffies_conv,NULL);
3012 }
3013
3014 /**
3015 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
3016 * @table: the sysctl table
3017 * @write: %TRUE if this is a write to the sysctl file
3018 * @buffer: the user buffer
3019 * @lenp: the size of the user buffer
3020 * @ppos: file position
3021 * @ppos: the current position in the file
3022 *
3023 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
3024 * values from/to the user buffer, treated as an ASCII string.
3025 * The values read are assumed to be in 1/1000 seconds, and
3026 * are converted into jiffies.
3027 *
3028 * Returns 0 on success.
3029 */
3030 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
3031 void __user *buffer, size_t *lenp, loff_t *ppos)
3032 {
3033 return do_proc_dointvec(table, write, buffer, lenp, ppos,
3034 do_proc_dointvec_ms_jiffies_conv, NULL);
3035 }
3036
3037 static int proc_do_cad_pid(struct ctl_table *table, int write,
3038 void __user *buffer, size_t *lenp, loff_t *ppos)
3039 {
3040 struct pid *new_pid;
3041 pid_t tmp;
3042 int r;
3043
3044 tmp = pid_vnr(cad_pid);
3045
3046 r = __do_proc_dointvec(&tmp, table, write, buffer,
3047 lenp, ppos, NULL, NULL);
3048 if (r || !write)
3049 return r;
3050
3051 new_pid = find_get_pid(tmp);
3052 if (!new_pid)
3053 return -ESRCH;
3054
3055 put_pid(xchg(&cad_pid, new_pid));
3056 return 0;
3057 }
3058
3059 /**
3060 * proc_do_large_bitmap - read/write from/to a large bitmap
3061 * @table: the sysctl table
3062 * @write: %TRUE if this is a write to the sysctl file
3063 * @buffer: the user buffer
3064 * @lenp: the size of the user buffer
3065 * @ppos: file position
3066 *
3067 * The bitmap is stored at table->data and the bitmap length (in bits)
3068 * in table->maxlen.
3069 *
3070 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
3071 * large bitmaps may be represented in a compact manner. Writing into
3072 * the file will clear the bitmap then update it with the given input.
3073 *
3074 * Returns 0 on success.
3075 */
3076 int proc_do_large_bitmap(struct ctl_table *table, int write,
3077 void __user *buffer, size_t *lenp, loff_t *ppos)
3078 {
3079 int err = 0;
3080 bool first = 1;
3081 size_t left = *lenp;
3082 unsigned long bitmap_len = table->maxlen;
3083 unsigned long *bitmap = *(unsigned long **) table->data;
3084 unsigned long *tmp_bitmap = NULL;
3085 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
3086
3087 if (!bitmap || !bitmap_len || !left || (*ppos && !write)) {
3088 *lenp = 0;
3089 return 0;
3090 }
3091
3092 if (write) {
3093 char *kbuf, *p;
3094
3095 if (left > PAGE_SIZE - 1)
3096 left = PAGE_SIZE - 1;
3097
3098 p = kbuf = memdup_user_nul(buffer, left);
3099 if (IS_ERR(kbuf))
3100 return PTR_ERR(kbuf);
3101
3102 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
3103 GFP_KERNEL);
3104 if (!tmp_bitmap) {
3105 kfree(kbuf);
3106 return -ENOMEM;
3107 }
3108 proc_skip_char(&p, &left, '\n');
3109 while (!err && left) {
3110 unsigned long val_a, val_b;
3111 bool neg;
3112
3113 err = proc_get_long(&p, &left, &val_a, &neg, tr_a,
3114 sizeof(tr_a), &c);
3115 if (err)
3116 break;
3117 if (val_a >= bitmap_len || neg) {
3118 err = -EINVAL;
3119 break;
3120 }
3121
3122 val_b = val_a;
3123 if (left) {
3124 p++;
3125 left--;
3126 }
3127
3128 if (c == '-') {
3129 err = proc_get_long(&p, &left, &val_b,
3130 &neg, tr_b, sizeof(tr_b),
3131 &c);
3132 if (err)
3133 break;
3134 if (val_b >= bitmap_len || neg ||
3135 val_a > val_b) {
3136 err = -EINVAL;
3137 break;
3138 }
3139 if (left) {
3140 p++;
3141 left--;
3142 }
3143 }
3144
3145 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
3146 first = 0;
3147 proc_skip_char(&p, &left, '\n');
3148 }
3149 kfree(kbuf);
3150 } else {
3151 unsigned long bit_a, bit_b = 0;
3152
3153 while (left) {
3154 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
3155 if (bit_a >= bitmap_len)
3156 break;
3157 bit_b = find_next_zero_bit(bitmap, bitmap_len,
3158 bit_a + 1) - 1;
3159
3160 if (!first) {
3161 err = proc_put_char(&buffer, &left, ',');
3162 if (err)
3163 break;
3164 }
3165 err = proc_put_long(&buffer, &left, bit_a, false);
3166 if (err)
3167 break;
3168 if (bit_a != bit_b) {
3169 err = proc_put_char(&buffer, &left, '-');
3170 if (err)
3171 break;
3172 err = proc_put_long(&buffer, &left, bit_b, false);
3173 if (err)
3174 break;
3175 }
3176
3177 first = 0; bit_b++;
3178 }
3179 if (!err)
3180 err = proc_put_char(&buffer, &left, '\n');
3181 }
3182
3183 if (!err) {
3184 if (write) {
3185 if (*ppos)
3186 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
3187 else
3188 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
3189 }
3190 kfree(tmp_bitmap);
3191 *lenp -= left;
3192 *ppos += *lenp;
3193 return 0;
3194 } else {
3195 kfree(tmp_bitmap);
3196 return err;
3197 }
3198 }
3199
3200 #else /* CONFIG_PROC_SYSCTL */
3201
3202 int proc_dostring(struct ctl_table *table, int write,
3203 void __user *buffer, size_t *lenp, loff_t *ppos)
3204 {
3205 return -ENOSYS;
3206 }
3207
3208 int proc_dointvec(struct ctl_table *table, int write,
3209 void __user *buffer, size_t *lenp, loff_t *ppos)
3210 {
3211 return -ENOSYS;
3212 }
3213
3214 int proc_douintvec(struct ctl_table *table, int write,
3215 void __user *buffer, size_t *lenp, loff_t *ppos)
3216 {
3217 return -ENOSYS;
3218 }
3219
3220 int proc_dointvec_minmax(struct ctl_table *table, int write,
3221 void __user *buffer, size_t *lenp, loff_t *ppos)
3222 {
3223 return -ENOSYS;
3224 }
3225
3226 int proc_douintvec_minmax(struct ctl_table *table, int write,
3227 void __user *buffer, size_t *lenp, loff_t *ppos)
3228 {
3229 return -ENOSYS;
3230 }
3231
3232 int proc_dointvec_jiffies(struct ctl_table *table, int write,
3233 void __user *buffer, size_t *lenp, loff_t *ppos)
3234 {
3235 return -ENOSYS;
3236 }
3237
3238 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
3239 void __user *buffer, size_t *lenp, loff_t *ppos)
3240 {
3241 return -ENOSYS;
3242 }
3243
3244 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
3245 void __user *buffer, size_t *lenp, loff_t *ppos)
3246 {
3247 return -ENOSYS;
3248 }
3249
3250 int proc_doulongvec_minmax(struct ctl_table *table, int write,
3251 void __user *buffer, size_t *lenp, loff_t *ppos)
3252 {
3253 return -ENOSYS;
3254 }
3255
3256 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
3257 void __user *buffer,
3258 size_t *lenp, loff_t *ppos)
3259 {
3260 return -ENOSYS;
3261 }
3262
3263
3264 #endif /* CONFIG_PROC_SYSCTL */
3265
3266 /*
3267 * No sense putting this after each symbol definition, twice,
3268 * exception granted :-)
3269 */
3270 EXPORT_SYMBOL(proc_dointvec);
3271 EXPORT_SYMBOL(proc_douintvec);
3272 EXPORT_SYMBOL(proc_dointvec_jiffies);
3273 EXPORT_SYMBOL(proc_dointvec_minmax);
3274 EXPORT_SYMBOL_GPL(proc_douintvec_minmax);
3275 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
3276 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
3277 EXPORT_SYMBOL(proc_dostring);
3278 EXPORT_SYMBOL(proc_doulongvec_minmax);
3279 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);