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