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TOMOYO Linux Cross Reference
Linux/kernel/sysctl.c

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  1 // SPDX-License-Identifier: GPL-2.0-only
  2 /*
  3  * sysctl.c: General linux system control interface
  4  *
  5  * Begun 24 March 1995, Stephen Tweedie
  6  * Added /proc support, Dec 1995
  7  * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
  8  * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
  9  * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
 10  * Dynamic registration fixes, Stephen Tweedie.
 11  * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
 12  * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
 13  *  Horn.
 14  * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
 15  * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
 16  * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
 17  *  Wendling.
 18  * The list_for_each() macro wasn't appropriate for the sysctl loop.
 19  *  Removed it and replaced it with older style, 03/23/00, Bill Wendling
 20  */
 21 
 22 #include <linux/module.h>
 23 #include <linux/aio.h>
 24 #include <linux/mm.h>
 25 #include <linux/swap.h>
 26 #include <linux/slab.h>
 27 #include <linux/sysctl.h>
 28 #include <linux/bitmap.h>
 29 #include <linux/signal.h>
 30 #include <linux/printk.h>
 31 #include <linux/proc_fs.h>
 32 #include <linux/security.h>
 33 #include <linux/ctype.h>
 34 #include <linux/kmemleak.h>
 35 #include <linux/fs.h>
 36 #include <linux/init.h>
 37 #include <linux/kernel.h>
 38 #include <linux/kobject.h>
 39 #include <linux/net.h>
 40 #include <linux/sysrq.h>
 41 #include <linux/highuid.h>
 42 #include <linux/writeback.h>
 43 #include <linux/ratelimit.h>
 44 #include <linux/compaction.h>
 45 #include <linux/hugetlb.h>
 46 #include <linux/initrd.h>
 47 #include <linux/key.h>
 48 #include <linux/times.h>
 49 #include <linux/limits.h>
 50 #include <linux/dcache.h>
 51 #include <linux/dnotify.h>
 52 #include <linux/syscalls.h>
 53 #include <linux/vmstat.h>
 54 #include <linux/nfs_fs.h>
 55 #include <linux/acpi.h>
 56 #include <linux/reboot.h>
 57 #include <linux/ftrace.h>
 58 #include <linux/perf_event.h>
 59 #include <linux/kprobes.h>
 60 #include <linux/pipe_fs_i.h>
 61 #include <linux/oom.h>
 62 #include <linux/kmod.h>
 63 #include <linux/capability.h>
 64 #include <linux/binfmts.h>
 65 #include <linux/sched/sysctl.h>
 66 #include <linux/sched/coredump.h>
 67 #include <linux/kexec.h>
 68 #include <linux/bpf.h>
 69 #include <linux/mount.h>
 70 #include <linux/userfaultfd_k.h>
 71 
 72 #include "../lib/kstrtox.h"
 73 
 74 #include <linux/uaccess.h>
 75 #include <asm/processor.h>
 76 
 77 #ifdef CONFIG_X86
 78 #include <asm/nmi.h>
 79 #include <asm/stacktrace.h>
 80 #include <asm/io.h>
 81 #endif
 82 #ifdef CONFIG_SPARC
 83 #include <asm/setup.h>
 84 #endif
 85 #ifdef CONFIG_BSD_PROCESS_ACCT
 86 #include <linux/acct.h>
 87 #endif
 88 #ifdef CONFIG_RT_MUTEXES
 89 #include <linux/rtmutex.h>
 90 #endif
 91 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
 92 #include <linux/lockdep.h>
 93 #endif
 94 #ifdef CONFIG_CHR_DEV_SG
 95 #include <scsi/sg.h>
 96 #endif
 97 #ifdef CONFIG_STACKLEAK_RUNTIME_DISABLE
 98 #include <linux/stackleak.h>
 99 #endif
100 #ifdef CONFIG_LOCKUP_DETECTOR
101 #include <linux/nmi.h>
102 #endif
103 
104 #if defined(CONFIG_SYSCTL)
105 
106 /* External variables not in a header file. */
107 extern int suid_dumpable;
108 #ifdef CONFIG_COREDUMP
109 extern int core_uses_pid;
110 extern char core_pattern[];
111 extern unsigned int core_pipe_limit;
112 #endif
113 extern int pid_max;
114 extern int pid_max_min, pid_max_max;
115 extern int percpu_pagelist_fraction;
116 extern int latencytop_enabled;
117 extern unsigned int sysctl_nr_open_min, sysctl_nr_open_max;
118 #ifndef CONFIG_MMU
119 extern int sysctl_nr_trim_pages;
120 #endif
121 
122 /* Constants used for minimum and  maximum */
123 #ifdef CONFIG_LOCKUP_DETECTOR
124 static int sixty = 60;
125 #endif
126 
127 static int __maybe_unused neg_one = -1;
128 static int __maybe_unused two = 2;
129 static int __maybe_unused four = 4;
130 static unsigned long zero_ul;
131 static unsigned long one_ul = 1;
132 static unsigned long long_max = LONG_MAX;
133 static int one_hundred = 100;
134 static int one_thousand = 1000;
135 #ifdef CONFIG_PRINTK
136 static int ten_thousand = 10000;
137 #endif
138 #ifdef CONFIG_PERF_EVENTS
139 static int six_hundred_forty_kb = 640 * 1024;
140 #endif
141 
142 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
143 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
144 
145 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
146 static int maxolduid = 65535;
147 static int minolduid;
148 
149 static int ngroups_max = NGROUPS_MAX;
150 static const int cap_last_cap = CAP_LAST_CAP;
151 
152 /*
153  * This is needed for proc_doulongvec_minmax of sysctl_hung_task_timeout_secs
154  * and hung_task_check_interval_secs
155  */
156 #ifdef CONFIG_DETECT_HUNG_TASK
157 static unsigned long hung_task_timeout_max = (LONG_MAX/HZ);
158 #endif
159 
160 #ifdef CONFIG_INOTIFY_USER
161 #include <linux/inotify.h>
162 #endif
163 #ifdef CONFIG_SPARC
164 #endif
165 
166 #ifdef CONFIG_PARISC
167 extern int pwrsw_enabled;
168 #endif
169 
170 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
171 extern int unaligned_enabled;
172 #endif
173 
174 #ifdef CONFIG_IA64
175 extern int unaligned_dump_stack;
176 #endif
177 
178 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
179 extern int no_unaligned_warning;
180 #endif
181 
182 #ifdef CONFIG_PROC_SYSCTL
183 
184 /**
185  * enum sysctl_writes_mode - supported sysctl write modes
186  *
187  * @SYSCTL_WRITES_LEGACY: each write syscall must fully contain the sysctl value
188  *      to be written, and multiple writes on the same sysctl file descriptor
189  *      will rewrite the sysctl value, regardless of file position. No warning
190  *      is issued when the initial position is not 0.
191  * @SYSCTL_WRITES_WARN: same as above but warn when the initial file position is
192  *      not 0.
193  * @SYSCTL_WRITES_STRICT: writes to numeric sysctl entries must always be at
194  *      file position 0 and the value must be fully contained in the buffer
195  *      sent to the write syscall. If dealing with strings respect the file
196  *      position, but restrict this to the max length of the buffer, anything
197  *      passed the max length will be ignored. Multiple writes will append
198  *      to the buffer.
199  *
200  * These write modes control how current file position affects the behavior of
201  * updating sysctl values through the proc interface on each write.
202  */
203 enum sysctl_writes_mode {
204         SYSCTL_WRITES_LEGACY            = -1,
205         SYSCTL_WRITES_WARN              = 0,
206         SYSCTL_WRITES_STRICT            = 1,
207 };
208 
209 static enum sysctl_writes_mode sysctl_writes_strict = SYSCTL_WRITES_STRICT;
210 
211 static int proc_do_cad_pid(struct ctl_table *table, int write,
212                   void __user *buffer, size_t *lenp, loff_t *ppos);
213 static int proc_taint(struct ctl_table *table, int write,
214                                void __user *buffer, size_t *lenp, loff_t *ppos);
215 #endif
216 
217 #ifdef CONFIG_PRINTK
218 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
219                                 void __user *buffer, size_t *lenp, loff_t *ppos);
220 #endif
221 
222 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
223                 void __user *buffer, size_t *lenp, loff_t *ppos);
224 #ifdef CONFIG_COREDUMP
225 static int proc_dostring_coredump(struct ctl_table *table, int write,
226                 void __user *buffer, size_t *lenp, loff_t *ppos);
227 #endif
228 static int proc_dopipe_max_size(struct ctl_table *table, int write,
229                 void __user *buffer, size_t *lenp, loff_t *ppos);
230 
231 #ifdef CONFIG_MAGIC_SYSRQ
232 /* Note: sysrq code uses its own private copy */
233 static int __sysrq_enabled = CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE;
234 
235 static int sysrq_sysctl_handler(struct ctl_table *table, int write,
236                                 void __user *buffer, size_t *lenp,
237                                 loff_t *ppos)
238 {
239         int error;
240 
241         error = proc_dointvec(table, write, buffer, lenp, ppos);
242         if (error)
243                 return error;
244 
245         if (write)
246                 sysrq_toggle_support(__sysrq_enabled);
247 
248         return 0;
249 }
250 
251 #endif
252 
253 static struct ctl_table kern_table[];
254 static struct ctl_table vm_table[];
255 static struct ctl_table fs_table[];
256 static struct ctl_table debug_table[];
257 static struct ctl_table dev_table[];
258 extern struct ctl_table random_table[];
259 #ifdef CONFIG_EPOLL
260 extern struct ctl_table epoll_table[];
261 #endif
262 
263 #ifdef CONFIG_FW_LOADER_USER_HELPER
264 extern struct ctl_table firmware_config_table[];
265 #endif
266 
267 #if defined(HAVE_ARCH_PICK_MMAP_LAYOUT) || \
268     defined(CONFIG_ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT)
269 int sysctl_legacy_va_layout;
270 #endif
271 
272 /* The default sysctl tables: */
273 
274 static struct ctl_table sysctl_base_table[] = {
275         {
276                 .procname       = "kernel",
277                 .mode           = 0555,
278                 .child          = kern_table,
279         },
280         {
281                 .procname       = "vm",
282                 .mode           = 0555,
283                 .child          = vm_table,
284         },
285         {
286                 .procname       = "fs",
287                 .mode           = 0555,
288                 .child          = fs_table,
289         },
290         {
291                 .procname       = "debug",
292                 .mode           = 0555,
293                 .child          = debug_table,
294         },
295         {
296                 .procname       = "dev",
297                 .mode           = 0555,
298                 .child          = dev_table,
299         },
300         { }
301 };
302 
303 #ifdef CONFIG_SCHED_DEBUG
304 static int min_sched_granularity_ns = 100000;           /* 100 usecs */
305 static int max_sched_granularity_ns = NSEC_PER_SEC;     /* 1 second */
306 static int min_wakeup_granularity_ns;                   /* 0 usecs */
307 static int max_wakeup_granularity_ns = NSEC_PER_SEC;    /* 1 second */
308 #ifdef CONFIG_SMP
309 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
310 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
311 #endif /* CONFIG_SMP */
312 #endif /* CONFIG_SCHED_DEBUG */
313 
314 #ifdef CONFIG_COMPACTION
315 static int min_extfrag_threshold;
316 static int max_extfrag_threshold = 1000;
317 #endif
318 
319 static struct ctl_table kern_table[] = {
320         {
321                 .procname       = "sched_child_runs_first",
322                 .data           = &sysctl_sched_child_runs_first,
323                 .maxlen         = sizeof(unsigned int),
324                 .mode           = 0644,
325                 .proc_handler   = proc_dointvec,
326         },
327 #ifdef CONFIG_SCHED_DEBUG
328         {
329                 .procname       = "sched_min_granularity_ns",
330                 .data           = &sysctl_sched_min_granularity,
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         {
338                 .procname       = "sched_latency_ns",
339                 .data           = &sysctl_sched_latency,
340                 .maxlen         = sizeof(unsigned int),
341                 .mode           = 0644,
342                 .proc_handler   = sched_proc_update_handler,
343                 .extra1         = &min_sched_granularity_ns,
344                 .extra2         = &max_sched_granularity_ns,
345         },
346         {
347                 .procname       = "sched_wakeup_granularity_ns",
348                 .data           = &sysctl_sched_wakeup_granularity,
349                 .maxlen         = sizeof(unsigned int),
350                 .mode           = 0644,
351                 .proc_handler   = sched_proc_update_handler,
352                 .extra1         = &min_wakeup_granularity_ns,
353                 .extra2         = &max_wakeup_granularity_ns,
354         },
355 #ifdef CONFIG_SMP
356         {
357                 .procname       = "sched_tunable_scaling",
358                 .data           = &sysctl_sched_tunable_scaling,
359                 .maxlen         = sizeof(enum sched_tunable_scaling),
360                 .mode           = 0644,
361                 .proc_handler   = sched_proc_update_handler,
362                 .extra1         = &min_sched_tunable_scaling,
363                 .extra2         = &max_sched_tunable_scaling,
364         },
365         {
366                 .procname       = "sched_migration_cost_ns",
367                 .data           = &sysctl_sched_migration_cost,
368                 .maxlen         = sizeof(unsigned int),
369                 .mode           = 0644,
370                 .proc_handler   = proc_dointvec,
371         },
372         {
373                 .procname       = "sched_nr_migrate",
374                 .data           = &sysctl_sched_nr_migrate,
375                 .maxlen         = sizeof(unsigned int),
376                 .mode           = 0644,
377                 .proc_handler   = proc_dointvec,
378         },
379 #ifdef CONFIG_SCHEDSTATS
380         {
381                 .procname       = "sched_schedstats",
382                 .data           = NULL,
383                 .maxlen         = sizeof(unsigned int),
384                 .mode           = 0644,
385                 .proc_handler   = sysctl_schedstats,
386                 .extra1         = SYSCTL_ZERO,
387                 .extra2         = SYSCTL_ONE,
388         },
389 #endif /* CONFIG_SCHEDSTATS */
390 #endif /* CONFIG_SMP */
391 #ifdef CONFIG_NUMA_BALANCING
392         {
393                 .procname       = "numa_balancing_scan_delay_ms",
394                 .data           = &sysctl_numa_balancing_scan_delay,
395                 .maxlen         = sizeof(unsigned int),
396                 .mode           = 0644,
397                 .proc_handler   = proc_dointvec,
398         },
399         {
400                 .procname       = "numa_balancing_scan_period_min_ms",
401                 .data           = &sysctl_numa_balancing_scan_period_min,
402                 .maxlen         = sizeof(unsigned int),
403                 .mode           = 0644,
404                 .proc_handler   = proc_dointvec,
405         },
406         {
407                 .procname       = "numa_balancing_scan_period_max_ms",
408                 .data           = &sysctl_numa_balancing_scan_period_max,
409                 .maxlen         = sizeof(unsigned int),
410                 .mode           = 0644,
411                 .proc_handler   = proc_dointvec,
412         },
413         {
414                 .procname       = "numa_balancing_scan_size_mb",
415                 .data           = &sysctl_numa_balancing_scan_size,
416                 .maxlen         = sizeof(unsigned int),
417                 .mode           = 0644,
418                 .proc_handler   = proc_dointvec_minmax,
419                 .extra1         = SYSCTL_ONE,
420         },
421         {
422                 .procname       = "numa_balancing",
423                 .data           = NULL, /* filled in by handler */
424                 .maxlen         = sizeof(unsigned int),
425                 .mode           = 0644,
426                 .proc_handler   = sysctl_numa_balancing,
427                 .extra1         = SYSCTL_ZERO,
428                 .extra2         = SYSCTL_ONE,
429         },
430 #endif /* CONFIG_NUMA_BALANCING */
431 #endif /* CONFIG_SCHED_DEBUG */
432         {
433                 .procname       = "sched_rt_period_us",
434                 .data           = &sysctl_sched_rt_period,
435                 .maxlen         = sizeof(unsigned int),
436                 .mode           = 0644,
437                 .proc_handler   = sched_rt_handler,
438         },
439         {
440                 .procname       = "sched_rt_runtime_us",
441                 .data           = &sysctl_sched_rt_runtime,
442                 .maxlen         = sizeof(int),
443                 .mode           = 0644,
444                 .proc_handler   = sched_rt_handler,
445         },
446         {
447                 .procname       = "sched_rr_timeslice_ms",
448                 .data           = &sysctl_sched_rr_timeslice,
449                 .maxlen         = sizeof(int),
450                 .mode           = 0644,
451                 .proc_handler   = sched_rr_handler,
452         },
453 #ifdef CONFIG_UCLAMP_TASK
454         {
455                 .procname       = "sched_util_clamp_min",
456                 .data           = &sysctl_sched_uclamp_util_min,
457                 .maxlen         = sizeof(unsigned int),
458                 .mode           = 0644,
459                 .proc_handler   = sysctl_sched_uclamp_handler,
460         },
461         {
462                 .procname       = "sched_util_clamp_max",
463                 .data           = &sysctl_sched_uclamp_util_max,
464                 .maxlen         = sizeof(unsigned int),
465                 .mode           = 0644,
466                 .proc_handler   = sysctl_sched_uclamp_handler,
467         },
468 #endif
469 #ifdef CONFIG_SCHED_AUTOGROUP
470         {
471                 .procname       = "sched_autogroup_enabled",
472                 .data           = &sysctl_sched_autogroup_enabled,
473                 .maxlen         = sizeof(unsigned int),
474                 .mode           = 0644,
475                 .proc_handler   = proc_dointvec_minmax,
476                 .extra1         = SYSCTL_ZERO,
477                 .extra2         = SYSCTL_ONE,
478         },
479 #endif
480 #ifdef CONFIG_CFS_BANDWIDTH
481         {
482                 .procname       = "sched_cfs_bandwidth_slice_us",
483                 .data           = &sysctl_sched_cfs_bandwidth_slice,
484                 .maxlen         = sizeof(unsigned int),
485                 .mode           = 0644,
486                 .proc_handler   = proc_dointvec_minmax,
487                 .extra1         = SYSCTL_ONE,
488         },
489 #endif
490 #if defined(CONFIG_ENERGY_MODEL) && defined(CONFIG_CPU_FREQ_GOV_SCHEDUTIL)
491         {
492                 .procname       = "sched_energy_aware",
493                 .data           = &sysctl_sched_energy_aware,
494                 .maxlen         = sizeof(unsigned int),
495                 .mode           = 0644,
496                 .proc_handler   = sched_energy_aware_handler,
497                 .extra1         = SYSCTL_ZERO,
498                 .extra2         = SYSCTL_ONE,
499         },
500 #endif
501 #ifdef CONFIG_PROVE_LOCKING
502         {
503                 .procname       = "prove_locking",
504                 .data           = &prove_locking,
505                 .maxlen         = sizeof(int),
506                 .mode           = 0644,
507                 .proc_handler   = proc_dointvec,
508         },
509 #endif
510 #ifdef CONFIG_LOCK_STAT
511         {
512                 .procname       = "lock_stat",
513                 .data           = &lock_stat,
514                 .maxlen         = sizeof(int),
515                 .mode           = 0644,
516                 .proc_handler   = proc_dointvec,
517         },
518 #endif
519         {
520                 .procname       = "panic",
521                 .data           = &panic_timeout,
522                 .maxlen         = sizeof(int),
523                 .mode           = 0644,
524                 .proc_handler   = proc_dointvec,
525         },
526 #ifdef CONFIG_COREDUMP
527         {
528                 .procname       = "core_uses_pid",
529                 .data           = &core_uses_pid,
530                 .maxlen         = sizeof(int),
531                 .mode           = 0644,
532                 .proc_handler   = proc_dointvec,
533         },
534         {
535                 .procname       = "core_pattern",
536                 .data           = core_pattern,
537                 .maxlen         = CORENAME_MAX_SIZE,
538                 .mode           = 0644,
539                 .proc_handler   = proc_dostring_coredump,
540         },
541         {
542                 .procname       = "core_pipe_limit",
543                 .data           = &core_pipe_limit,
544                 .maxlen         = sizeof(unsigned int),
545                 .mode           = 0644,
546                 .proc_handler   = proc_dointvec,
547         },
548 #endif
549 #ifdef CONFIG_PROC_SYSCTL
550         {
551                 .procname       = "tainted",
552                 .maxlen         = sizeof(long),
553                 .mode           = 0644,
554                 .proc_handler   = proc_taint,
555         },
556         {
557                 .procname       = "sysctl_writes_strict",
558                 .data           = &sysctl_writes_strict,
559                 .maxlen         = sizeof(int),
560                 .mode           = 0644,
561                 .proc_handler   = proc_dointvec_minmax,
562                 .extra1         = &neg_one,
563                 .extra2         = SYSCTL_ONE,
564         },
565 #endif
566 #ifdef CONFIG_LATENCYTOP
567         {
568                 .procname       = "latencytop",
569                 .data           = &latencytop_enabled,
570                 .maxlen         = sizeof(int),
571                 .mode           = 0644,
572                 .proc_handler   = sysctl_latencytop,
573         },
574 #endif
575 #ifdef CONFIG_BLK_DEV_INITRD
576         {
577                 .procname       = "real-root-dev",
578                 .data           = &real_root_dev,
579                 .maxlen         = sizeof(int),
580                 .mode           = 0644,
581                 .proc_handler   = proc_dointvec,
582         },
583 #endif
584         {
585                 .procname       = "print-fatal-signals",
586                 .data           = &print_fatal_signals,
587                 .maxlen         = sizeof(int),
588                 .mode           = 0644,
589                 .proc_handler   = proc_dointvec,
590         },
591 #ifdef CONFIG_SPARC
592         {
593                 .procname       = "reboot-cmd",
594                 .data           = reboot_command,
595                 .maxlen         = 256,
596                 .mode           = 0644,
597                 .proc_handler   = proc_dostring,
598         },
599         {
600                 .procname       = "stop-a",
601                 .data           = &stop_a_enabled,
602                 .maxlen         = sizeof (int),
603                 .mode           = 0644,
604                 .proc_handler   = proc_dointvec,
605         },
606         {
607                 .procname       = "scons-poweroff",
608                 .data           = &scons_pwroff,
609                 .maxlen         = sizeof (int),
610                 .mode           = 0644,
611                 .proc_handler   = proc_dointvec,
612         },
613 #endif
614 #ifdef CONFIG_SPARC64
615         {
616                 .procname       = "tsb-ratio",
617                 .data           = &sysctl_tsb_ratio,
618                 .maxlen         = sizeof (int),
619                 .mode           = 0644,
620                 .proc_handler   = proc_dointvec,
621         },
622 #endif
623 #ifdef CONFIG_PARISC
624         {
625                 .procname       = "soft-power",
626                 .data           = &pwrsw_enabled,
627                 .maxlen         = sizeof (int),
628                 .mode           = 0644,
629                 .proc_handler   = proc_dointvec,
630         },
631 #endif
632 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
633         {
634                 .procname       = "unaligned-trap",
635                 .data           = &unaligned_enabled,
636                 .maxlen         = sizeof (int),
637                 .mode           = 0644,
638                 .proc_handler   = proc_dointvec,
639         },
640 #endif
641         {
642                 .procname       = "ctrl-alt-del",
643                 .data           = &C_A_D,
644                 .maxlen         = sizeof(int),
645                 .mode           = 0644,
646                 .proc_handler   = proc_dointvec,
647         },
648 #ifdef CONFIG_FUNCTION_TRACER
649         {
650                 .procname       = "ftrace_enabled",
651                 .data           = &ftrace_enabled,
652                 .maxlen         = sizeof(int),
653                 .mode           = 0644,
654                 .proc_handler   = ftrace_enable_sysctl,
655         },
656 #endif
657 #ifdef CONFIG_STACK_TRACER
658         {
659                 .procname       = "stack_tracer_enabled",
660                 .data           = &stack_tracer_enabled,
661                 .maxlen         = sizeof(int),
662                 .mode           = 0644,
663                 .proc_handler   = stack_trace_sysctl,
664         },
665 #endif
666 #ifdef CONFIG_TRACING
667         {
668                 .procname       = "ftrace_dump_on_oops",
669                 .data           = &ftrace_dump_on_oops,
670                 .maxlen         = sizeof(int),
671                 .mode           = 0644,
672                 .proc_handler   = proc_dointvec,
673         },
674         {
675                 .procname       = "traceoff_on_warning",
676                 .data           = &__disable_trace_on_warning,
677                 .maxlen         = sizeof(__disable_trace_on_warning),
678                 .mode           = 0644,
679                 .proc_handler   = proc_dointvec,
680         },
681         {
682                 .procname       = "tracepoint_printk",
683                 .data           = &tracepoint_printk,
684                 .maxlen         = sizeof(tracepoint_printk),
685                 .mode           = 0644,
686                 .proc_handler   = tracepoint_printk_sysctl,
687         },
688 #endif
689 #ifdef CONFIG_KEXEC_CORE
690         {
691                 .procname       = "kexec_load_disabled",
692                 .data           = &kexec_load_disabled,
693                 .maxlen         = sizeof(int),
694                 .mode           = 0644,
695                 /* only handle a transition from default "" to "1" */
696                 .proc_handler   = proc_dointvec_minmax,
697                 .extra1         = SYSCTL_ONE,
698                 .extra2         = SYSCTL_ONE,
699         },
700 #endif
701 #ifdef CONFIG_MODULES
702         {
703                 .procname       = "modprobe",
704                 .data           = &modprobe_path,
705                 .maxlen         = KMOD_PATH_LEN,
706                 .mode           = 0644,
707                 .proc_handler   = proc_dostring,
708         },
709         {
710                 .procname       = "modules_disabled",
711                 .data           = &modules_disabled,
712                 .maxlen         = sizeof(int),
713                 .mode           = 0644,
714                 /* only handle a transition from default "" to "1" */
715                 .proc_handler   = proc_dointvec_minmax,
716                 .extra1         = SYSCTL_ONE,
717                 .extra2         = SYSCTL_ONE,
718         },
719 #endif
720 #ifdef CONFIG_UEVENT_HELPER
721         {
722                 .procname       = "hotplug",
723                 .data           = &uevent_helper,
724                 .maxlen         = UEVENT_HELPER_PATH_LEN,
725                 .mode           = 0644,
726                 .proc_handler   = proc_dostring,
727         },
728 #endif
729 #ifdef CONFIG_CHR_DEV_SG
730         {
731                 .procname       = "sg-big-buff",
732                 .data           = &sg_big_buff,
733                 .maxlen         = sizeof (int),
734                 .mode           = 0444,
735                 .proc_handler   = proc_dointvec,
736         },
737 #endif
738 #ifdef CONFIG_BSD_PROCESS_ACCT
739         {
740                 .procname       = "acct",
741                 .data           = &acct_parm,
742                 .maxlen         = 3*sizeof(int),
743                 .mode           = 0644,
744                 .proc_handler   = proc_dointvec,
745         },
746 #endif
747 #ifdef CONFIG_MAGIC_SYSRQ
748         {
749                 .procname       = "sysrq",
750                 .data           = &__sysrq_enabled,
751                 .maxlen         = sizeof (int),
752                 .mode           = 0644,
753                 .proc_handler   = sysrq_sysctl_handler,
754         },
755 #endif
756 #ifdef CONFIG_PROC_SYSCTL
757         {
758                 .procname       = "cad_pid",
759                 .data           = NULL,
760                 .maxlen         = sizeof (int),
761                 .mode           = 0600,
762                 .proc_handler   = proc_do_cad_pid,
763         },
764 #endif
765         {
766                 .procname       = "threads-max",
767                 .data           = NULL,
768                 .maxlen         = sizeof(int),
769                 .mode           = 0644,
770                 .proc_handler   = sysctl_max_threads,
771         },
772         {
773                 .procname       = "random",
774                 .mode           = 0555,
775                 .child          = random_table,
776         },
777         {
778                 .procname       = "usermodehelper",
779                 .mode           = 0555,
780                 .child          = usermodehelper_table,
781         },
782 #ifdef CONFIG_FW_LOADER_USER_HELPER
783         {
784                 .procname       = "firmware_config",
785                 .mode           = 0555,
786                 .child          = firmware_config_table,
787         },
788 #endif
789         {
790                 .procname       = "overflowuid",
791                 .data           = &overflowuid,
792                 .maxlen         = sizeof(int),
793                 .mode           = 0644,
794                 .proc_handler   = proc_dointvec_minmax,
795                 .extra1         = &minolduid,
796                 .extra2         = &maxolduid,
797         },
798         {
799                 .procname       = "overflowgid",
800                 .data           = &overflowgid,
801                 .maxlen         = sizeof(int),
802                 .mode           = 0644,
803                 .proc_handler   = proc_dointvec_minmax,
804                 .extra1         = &minolduid,
805                 .extra2         = &maxolduid,
806         },
807 #ifdef CONFIG_S390
808 #ifdef CONFIG_MATHEMU
809         {
810                 .procname       = "ieee_emulation_warnings",
811                 .data           = &sysctl_ieee_emulation_warnings,
812                 .maxlen         = sizeof(int),
813                 .mode           = 0644,
814                 .proc_handler   = proc_dointvec,
815         },
816 #endif
817         {
818                 .procname       = "userprocess_debug",
819                 .data           = &show_unhandled_signals,
820                 .maxlen         = sizeof(int),
821                 .mode           = 0644,
822                 .proc_handler   = proc_dointvec,
823         },
824 #endif
825         {
826                 .procname       = "pid_max",
827                 .data           = &pid_max,
828                 .maxlen         = sizeof (int),
829                 .mode           = 0644,
830                 .proc_handler   = proc_dointvec_minmax,
831                 .extra1         = &pid_max_min,
832                 .extra2         = &pid_max_max,
833         },
834         {
835                 .procname       = "panic_on_oops",
836                 .data           = &panic_on_oops,
837                 .maxlen         = sizeof(int),
838                 .mode           = 0644,
839                 .proc_handler   = proc_dointvec,
840         },
841         {
842                 .procname       = "panic_print",
843                 .data           = &panic_print,
844                 .maxlen         = sizeof(unsigned long),
845                 .mode           = 0644,
846                 .proc_handler   = proc_doulongvec_minmax,
847         },
848 #if defined CONFIG_PRINTK
849         {
850                 .procname       = "printk",
851                 .data           = &console_loglevel,
852                 .maxlen         = 4*sizeof(int),
853                 .mode           = 0644,
854                 .proc_handler   = proc_dointvec,
855         },
856         {
857                 .procname       = "printk_ratelimit",
858                 .data           = &printk_ratelimit_state.interval,
859                 .maxlen         = sizeof(int),
860                 .mode           = 0644,
861                 .proc_handler   = proc_dointvec_jiffies,
862         },
863         {
864                 .procname       = "printk_ratelimit_burst",
865                 .data           = &printk_ratelimit_state.burst,
866                 .maxlen         = sizeof(int),
867                 .mode           = 0644,
868                 .proc_handler   = proc_dointvec,
869         },
870         {
871                 .procname       = "printk_delay",
872                 .data           = &printk_delay_msec,
873                 .maxlen         = sizeof(int),
874                 .mode           = 0644,
875                 .proc_handler   = proc_dointvec_minmax,
876                 .extra1         = SYSCTL_ZERO,
877                 .extra2         = &ten_thousand,
878         },
879         {
880                 .procname       = "printk_devkmsg",
881                 .data           = devkmsg_log_str,
882                 .maxlen         = DEVKMSG_STR_MAX_SIZE,
883                 .mode           = 0644,
884                 .proc_handler   = devkmsg_sysctl_set_loglvl,
885         },
886         {
887                 .procname       = "dmesg_restrict",
888                 .data           = &dmesg_restrict,
889                 .maxlen         = sizeof(int),
890                 .mode           = 0644,
891                 .proc_handler   = proc_dointvec_minmax_sysadmin,
892                 .extra1         = SYSCTL_ZERO,
893                 .extra2         = SYSCTL_ONE,
894         },
895         {
896                 .procname       = "kptr_restrict",
897                 .data           = &kptr_restrict,
898                 .maxlen         = sizeof(int),
899                 .mode           = 0644,
900                 .proc_handler   = proc_dointvec_minmax_sysadmin,
901                 .extra1         = SYSCTL_ZERO,
902                 .extra2         = &two,
903         },
904 #endif
905         {
906                 .procname       = "ngroups_max",
907                 .data           = &ngroups_max,
908                 .maxlen         = sizeof (int),
909                 .mode           = 0444,
910                 .proc_handler   = proc_dointvec,
911         },
912         {
913                 .procname       = "cap_last_cap",
914                 .data           = (void *)&cap_last_cap,
915                 .maxlen         = sizeof(int),
916                 .mode           = 0444,
917                 .proc_handler   = proc_dointvec,
918         },
919 #if defined(CONFIG_LOCKUP_DETECTOR)
920         {
921                 .procname       = "watchdog",
922                 .data           = &watchdog_user_enabled,
923                 .maxlen         = sizeof(int),
924                 .mode           = 0644,
925                 .proc_handler   = proc_watchdog,
926                 .extra1         = SYSCTL_ZERO,
927                 .extra2         = SYSCTL_ONE,
928         },
929         {
930                 .procname       = "watchdog_thresh",
931                 .data           = &watchdog_thresh,
932                 .maxlen         = sizeof(int),
933                 .mode           = 0644,
934                 .proc_handler   = proc_watchdog_thresh,
935                 .extra1         = SYSCTL_ZERO,
936                 .extra2         = &sixty,
937         },
938         {
939                 .procname       = "nmi_watchdog",
940                 .data           = &nmi_watchdog_user_enabled,
941                 .maxlen         = sizeof(int),
942                 .mode           = NMI_WATCHDOG_SYSCTL_PERM,
943                 .proc_handler   = proc_nmi_watchdog,
944                 .extra1         = SYSCTL_ZERO,
945                 .extra2         = SYSCTL_ONE,
946         },
947         {
948                 .procname       = "watchdog_cpumask",
949                 .data           = &watchdog_cpumask_bits,
950                 .maxlen         = NR_CPUS,
951                 .mode           = 0644,
952                 .proc_handler   = proc_watchdog_cpumask,
953         },
954 #ifdef CONFIG_SOFTLOCKUP_DETECTOR
955         {
956                 .procname       = "soft_watchdog",
957                 .data           = &soft_watchdog_user_enabled,
958                 .maxlen         = sizeof(int),
959                 .mode           = 0644,
960                 .proc_handler   = proc_soft_watchdog,
961                 .extra1         = SYSCTL_ZERO,
962                 .extra2         = SYSCTL_ONE,
963         },
964         {
965                 .procname       = "softlockup_panic",
966                 .data           = &softlockup_panic,
967                 .maxlen         = sizeof(int),
968                 .mode           = 0644,
969                 .proc_handler   = proc_dointvec_minmax,
970                 .extra1         = SYSCTL_ZERO,
971                 .extra2         = SYSCTL_ONE,
972         },
973 #ifdef CONFIG_SMP
974         {
975                 .procname       = "softlockup_all_cpu_backtrace",
976                 .data           = &sysctl_softlockup_all_cpu_backtrace,
977                 .maxlen         = sizeof(int),
978                 .mode           = 0644,
979                 .proc_handler   = proc_dointvec_minmax,
980                 .extra1         = SYSCTL_ZERO,
981                 .extra2         = SYSCTL_ONE,
982         },
983 #endif /* CONFIG_SMP */
984 #endif
985 #ifdef CONFIG_HARDLOCKUP_DETECTOR
986         {
987                 .procname       = "hardlockup_panic",
988                 .data           = &hardlockup_panic,
989                 .maxlen         = sizeof(int),
990                 .mode           = 0644,
991                 .proc_handler   = proc_dointvec_minmax,
992                 .extra1         = SYSCTL_ZERO,
993                 .extra2         = SYSCTL_ONE,
994         },
995 #ifdef CONFIG_SMP
996         {
997                 .procname       = "hardlockup_all_cpu_backtrace",
998                 .data           = &sysctl_hardlockup_all_cpu_backtrace,
999                 .maxlen         = sizeof(int),
1000                 .mode           = 0644,
1001                 .proc_handler   = proc_dointvec_minmax,
1002                 .extra1         = SYSCTL_ZERO,
1003                 .extra2         = SYSCTL_ONE,
1004         },
1005 #endif /* CONFIG_SMP */
1006 #endif
1007 #endif
1008 
1009 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
1010         {
1011                 .procname       = "unknown_nmi_panic",
1012                 .data           = &unknown_nmi_panic,
1013                 .maxlen         = sizeof (int),
1014                 .mode           = 0644,
1015                 .proc_handler   = proc_dointvec,
1016         },
1017 #endif
1018 #if defined(CONFIG_X86)
1019         {
1020                 .procname       = "panic_on_unrecovered_nmi",
1021                 .data           = &panic_on_unrecovered_nmi,
1022                 .maxlen         = sizeof(int),
1023                 .mode           = 0644,
1024                 .proc_handler   = proc_dointvec,
1025         },
1026         {
1027                 .procname       = "panic_on_io_nmi",
1028                 .data           = &panic_on_io_nmi,
1029                 .maxlen         = sizeof(int),
1030                 .mode           = 0644,
1031                 .proc_handler   = proc_dointvec,
1032         },
1033 #ifdef CONFIG_DEBUG_STACKOVERFLOW
1034         {
1035                 .procname       = "panic_on_stackoverflow",
1036                 .data           = &sysctl_panic_on_stackoverflow,
1037                 .maxlen         = sizeof(int),
1038                 .mode           = 0644,
1039                 .proc_handler   = proc_dointvec,
1040         },
1041 #endif
1042         {
1043                 .procname       = "bootloader_type",
1044                 .data           = &bootloader_type,
1045                 .maxlen         = sizeof (int),
1046                 .mode           = 0444,
1047                 .proc_handler   = proc_dointvec,
1048         },
1049         {
1050                 .procname       = "bootloader_version",
1051                 .data           = &bootloader_version,
1052                 .maxlen         = sizeof (int),
1053                 .mode           = 0444,
1054                 .proc_handler   = proc_dointvec,
1055         },
1056         {
1057                 .procname       = "io_delay_type",
1058                 .data           = &io_delay_type,
1059                 .maxlen         = sizeof(int),
1060                 .mode           = 0644,
1061                 .proc_handler   = proc_dointvec,
1062         },
1063 #endif
1064 #if defined(CONFIG_MMU)
1065         {
1066                 .procname       = "randomize_va_space",
1067                 .data           = &randomize_va_space,
1068                 .maxlen         = sizeof(int),
1069                 .mode           = 0644,
1070                 .proc_handler   = proc_dointvec,
1071         },
1072 #endif
1073 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
1074         {
1075                 .procname       = "spin_retry",
1076                 .data           = &spin_retry,
1077                 .maxlen         = sizeof (int),
1078                 .mode           = 0644,
1079                 .proc_handler   = proc_dointvec,
1080         },
1081 #endif
1082 #if     defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
1083         {
1084                 .procname       = "acpi_video_flags",
1085                 .data           = &acpi_realmode_flags,
1086                 .maxlen         = sizeof (unsigned long),
1087                 .mode           = 0644,
1088                 .proc_handler   = proc_doulongvec_minmax,
1089         },
1090 #endif
1091 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
1092         {
1093                 .procname       = "ignore-unaligned-usertrap",
1094                 .data           = &no_unaligned_warning,
1095                 .maxlen         = sizeof (int),
1096                 .mode           = 0644,
1097                 .proc_handler   = proc_dointvec,
1098         },
1099 #endif
1100 #ifdef CONFIG_IA64
1101         {
1102                 .procname       = "unaligned-dump-stack",
1103                 .data           = &unaligned_dump_stack,
1104                 .maxlen         = sizeof (int),
1105                 .mode           = 0644,
1106                 .proc_handler   = proc_dointvec,
1107         },
1108 #endif
1109 #ifdef CONFIG_DETECT_HUNG_TASK
1110         {
1111                 .procname       = "hung_task_panic",
1112                 .data           = &sysctl_hung_task_panic,
1113                 .maxlen         = sizeof(int),
1114                 .mode           = 0644,
1115                 .proc_handler   = proc_dointvec_minmax,
1116                 .extra1         = SYSCTL_ZERO,
1117                 .extra2         = SYSCTL_ONE,
1118         },
1119         {
1120                 .procname       = "hung_task_check_count",
1121                 .data           = &sysctl_hung_task_check_count,
1122                 .maxlen         = sizeof(int),
1123                 .mode           = 0644,
1124                 .proc_handler   = proc_dointvec_minmax,
1125                 .extra1         = SYSCTL_ZERO,
1126         },
1127         {
1128                 .procname       = "hung_task_timeout_secs",
1129                 .data           = &sysctl_hung_task_timeout_secs,
1130                 .maxlen         = sizeof(unsigned long),
1131                 .mode           = 0644,
1132                 .proc_handler   = proc_dohung_task_timeout_secs,
1133                 .extra2         = &hung_task_timeout_max,
1134         },
1135         {
1136                 .procname       = "hung_task_check_interval_secs",
1137                 .data           = &sysctl_hung_task_check_interval_secs,
1138                 .maxlen         = sizeof(unsigned long),
1139                 .mode           = 0644,
1140                 .proc_handler   = proc_dohung_task_timeout_secs,
1141                 .extra2         = &hung_task_timeout_max,
1142         },
1143         {
1144                 .procname       = "hung_task_warnings",
1145                 .data           = &sysctl_hung_task_warnings,
1146                 .maxlen         = sizeof(int),
1147                 .mode           = 0644,
1148                 .proc_handler   = proc_dointvec_minmax,
1149                 .extra1         = &neg_one,
1150         },
1151 #endif
1152 #ifdef CONFIG_RT_MUTEXES
1153         {
1154                 .procname       = "max_lock_depth",
1155                 .data           = &max_lock_depth,
1156                 .maxlen         = sizeof(int),
1157                 .mode           = 0644,
1158                 .proc_handler   = proc_dointvec,
1159         },
1160 #endif
1161         {
1162                 .procname       = "poweroff_cmd",
1163                 .data           = &poweroff_cmd,
1164                 .maxlen         = POWEROFF_CMD_PATH_LEN,
1165                 .mode           = 0644,
1166                 .proc_handler   = proc_dostring,
1167         },
1168 #ifdef CONFIG_KEYS
1169         {
1170                 .procname       = "keys",
1171                 .mode           = 0555,
1172                 .child          = key_sysctls,
1173         },
1174 #endif
1175 #ifdef CONFIG_PERF_EVENTS
1176         /*
1177          * User-space scripts rely on the existence of this file
1178          * as a feature check for perf_events being enabled.
1179          *
1180          * So it's an ABI, do not remove!
1181          */
1182         {
1183                 .procname       = "perf_event_paranoid",
1184                 .data           = &sysctl_perf_event_paranoid,
1185                 .maxlen         = sizeof(sysctl_perf_event_paranoid),
1186                 .mode           = 0644,
1187                 .proc_handler   = proc_dointvec,
1188         },
1189         {
1190                 .procname       = "perf_event_mlock_kb",
1191                 .data           = &sysctl_perf_event_mlock,
1192                 .maxlen         = sizeof(sysctl_perf_event_mlock),
1193                 .mode           = 0644,
1194                 .proc_handler   = proc_dointvec,
1195         },
1196         {
1197                 .procname       = "perf_event_max_sample_rate",
1198                 .data           = &sysctl_perf_event_sample_rate,
1199                 .maxlen         = sizeof(sysctl_perf_event_sample_rate),
1200                 .mode           = 0644,
1201                 .proc_handler   = perf_proc_update_handler,
1202                 .extra1         = SYSCTL_ONE,
1203         },
1204         {
1205                 .procname       = "perf_cpu_time_max_percent",
1206                 .data           = &sysctl_perf_cpu_time_max_percent,
1207                 .maxlen         = sizeof(sysctl_perf_cpu_time_max_percent),
1208                 .mode           = 0644,
1209                 .proc_handler   = perf_cpu_time_max_percent_handler,
1210                 .extra1         = SYSCTL_ZERO,
1211                 .extra2         = &one_hundred,
1212         },
1213         {
1214                 .procname       = "perf_event_max_stack",
1215                 .data           = &sysctl_perf_event_max_stack,
1216                 .maxlen         = sizeof(sysctl_perf_event_max_stack),
1217                 .mode           = 0644,
1218                 .proc_handler   = perf_event_max_stack_handler,
1219                 .extra1         = SYSCTL_ZERO,
1220                 .extra2         = &six_hundred_forty_kb,
1221         },
1222         {
1223                 .procname       = "perf_event_max_contexts_per_stack",
1224                 .data           = &sysctl_perf_event_max_contexts_per_stack,
1225                 .maxlen         = sizeof(sysctl_perf_event_max_contexts_per_stack),
1226                 .mode           = 0644,
1227                 .proc_handler   = perf_event_max_stack_handler,
1228                 .extra1         = SYSCTL_ZERO,
1229                 .extra2         = &one_thousand,
1230         },
1231 #endif
1232         {
1233                 .procname       = "panic_on_warn",
1234                 .data           = &panic_on_warn,
1235                 .maxlen         = sizeof(int),
1236                 .mode           = 0644,
1237                 .proc_handler   = proc_dointvec_minmax,
1238                 .extra1         = SYSCTL_ZERO,
1239                 .extra2         = SYSCTL_ONE,
1240         },
1241 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
1242         {
1243                 .procname       = "timer_migration",
1244                 .data           = &sysctl_timer_migration,
1245                 .maxlen         = sizeof(unsigned int),
1246                 .mode           = 0644,
1247                 .proc_handler   = timer_migration_handler,
1248                 .extra1         = SYSCTL_ZERO,
1249                 .extra2         = SYSCTL_ONE,
1250         },
1251 #endif
1252 #ifdef CONFIG_BPF_SYSCALL
1253         {
1254                 .procname       = "unprivileged_bpf_disabled",
1255                 .data           = &sysctl_unprivileged_bpf_disabled,
1256                 .maxlen         = sizeof(sysctl_unprivileged_bpf_disabled),
1257                 .mode           = 0644,
1258                 /* only handle a transition from default "" to "1" */
1259                 .proc_handler   = proc_dointvec_minmax,
1260                 .extra1         = SYSCTL_ONE,
1261                 .extra2         = SYSCTL_ONE,
1262         },
1263         {
1264                 .procname       = "bpf_stats_enabled",
1265                 .data           = &bpf_stats_enabled_key.key,
1266                 .maxlen         = sizeof(bpf_stats_enabled_key),
1267                 .mode           = 0644,
1268                 .proc_handler   = proc_do_static_key,
1269         },
1270 #endif
1271 #if defined(CONFIG_TREE_RCU) || defined(CONFIG_PREEMPT_RCU)
1272         {
1273                 .procname       = "panic_on_rcu_stall",
1274                 .data           = &sysctl_panic_on_rcu_stall,
1275                 .maxlen         = sizeof(sysctl_panic_on_rcu_stall),
1276                 .mode           = 0644,
1277                 .proc_handler   = proc_dointvec_minmax,
1278                 .extra1         = SYSCTL_ZERO,
1279                 .extra2         = SYSCTL_ONE,
1280         },
1281 #endif
1282 #ifdef CONFIG_STACKLEAK_RUNTIME_DISABLE
1283         {
1284                 .procname       = "stack_erasing",
1285                 .data           = NULL,
1286                 .maxlen         = sizeof(int),
1287                 .mode           = 0600,
1288                 .proc_handler   = stack_erasing_sysctl,
1289                 .extra1         = SYSCTL_ZERO,
1290                 .extra2         = SYSCTL_ONE,
1291         },
1292 #endif
1293         { }
1294 };
1295 
1296 static struct ctl_table vm_table[] = {
1297         {
1298                 .procname       = "overcommit_memory",
1299                 .data           = &sysctl_overcommit_memory,
1300                 .maxlen         = sizeof(sysctl_overcommit_memory),
1301                 .mode           = 0644,
1302                 .proc_handler   = proc_dointvec_minmax,
1303                 .extra1         = SYSCTL_ZERO,
1304                 .extra2         = &two,
1305         },
1306         {
1307                 .procname       = "panic_on_oom",
1308                 .data           = &sysctl_panic_on_oom,
1309                 .maxlen         = sizeof(sysctl_panic_on_oom),
1310                 .mode           = 0644,
1311                 .proc_handler   = proc_dointvec_minmax,
1312                 .extra1         = SYSCTL_ZERO,
1313                 .extra2         = &two,
1314         },
1315         {
1316                 .procname       = "oom_kill_allocating_task",
1317                 .data           = &sysctl_oom_kill_allocating_task,
1318                 .maxlen         = sizeof(sysctl_oom_kill_allocating_task),
1319                 .mode           = 0644,
1320                 .proc_handler   = proc_dointvec,
1321         },
1322         {
1323                 .procname       = "oom_dump_tasks",
1324                 .data           = &sysctl_oom_dump_tasks,
1325                 .maxlen         = sizeof(sysctl_oom_dump_tasks),
1326                 .mode           = 0644,
1327                 .proc_handler   = proc_dointvec,
1328         },
1329         {
1330                 .procname       = "overcommit_ratio",
1331                 .data           = &sysctl_overcommit_ratio,
1332                 .maxlen         = sizeof(sysctl_overcommit_ratio),
1333                 .mode           = 0644,
1334                 .proc_handler   = overcommit_ratio_handler,
1335         },
1336         {
1337                 .procname       = "overcommit_kbytes",
1338                 .data           = &sysctl_overcommit_kbytes,
1339                 .maxlen         = sizeof(sysctl_overcommit_kbytes),
1340                 .mode           = 0644,
1341                 .proc_handler   = overcommit_kbytes_handler,
1342         },
1343         {
1344                 .procname       = "page-cluster", 
1345                 .data           = &page_cluster,
1346                 .maxlen         = sizeof(int),
1347                 .mode           = 0644,
1348                 .proc_handler   = proc_dointvec_minmax,
1349                 .extra1         = SYSCTL_ZERO,
1350         },
1351         {
1352                 .procname       = "dirty_background_ratio",
1353                 .data           = &dirty_background_ratio,
1354                 .maxlen         = sizeof(dirty_background_ratio),
1355                 .mode           = 0644,
1356                 .proc_handler   = dirty_background_ratio_handler,
1357                 .extra1         = SYSCTL_ZERO,
1358                 .extra2         = &one_hundred,
1359         },
1360         {
1361                 .procname       = "dirty_background_bytes",
1362                 .data           = &dirty_background_bytes,
1363                 .maxlen         = sizeof(dirty_background_bytes),
1364                 .mode           = 0644,
1365                 .proc_handler   = dirty_background_bytes_handler,
1366                 .extra1         = &one_ul,
1367         },
1368         {
1369                 .procname       = "dirty_ratio",
1370                 .data           = &vm_dirty_ratio,
1371                 .maxlen         = sizeof(vm_dirty_ratio),
1372                 .mode           = 0644,
1373                 .proc_handler   = dirty_ratio_handler,
1374                 .extra1         = SYSCTL_ZERO,
1375                 .extra2         = &one_hundred,
1376         },
1377         {
1378                 .procname       = "dirty_bytes",
1379                 .data           = &vm_dirty_bytes,
1380                 .maxlen         = sizeof(vm_dirty_bytes),
1381                 .mode           = 0644,
1382                 .proc_handler   = dirty_bytes_handler,
1383                 .extra1         = &dirty_bytes_min,
1384         },
1385         {
1386                 .procname       = "dirty_writeback_centisecs",
1387                 .data           = &dirty_writeback_interval,
1388                 .maxlen         = sizeof(dirty_writeback_interval),
1389                 .mode           = 0644,
1390                 .proc_handler   = dirty_writeback_centisecs_handler,
1391         },
1392         {
1393                 .procname       = "dirty_expire_centisecs",
1394                 .data           = &dirty_expire_interval,
1395                 .maxlen         = sizeof(dirty_expire_interval),
1396                 .mode           = 0644,
1397                 .proc_handler   = proc_dointvec_minmax,
1398                 .extra1         = SYSCTL_ZERO,
1399         },
1400         {
1401                 .procname       = "dirtytime_expire_seconds",
1402                 .data           = &dirtytime_expire_interval,
1403                 .maxlen         = sizeof(dirtytime_expire_interval),
1404                 .mode           = 0644,
1405                 .proc_handler   = dirtytime_interval_handler,
1406                 .extra1         = SYSCTL_ZERO,
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         = SYSCTL_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         {
1434                 .procname               = "numa_stat",
1435                 .data                   = &sysctl_vm_numa_stat,
1436                 .maxlen                 = sizeof(int),
1437                 .mode                   = 0644,
1438                 .proc_handler   = sysctl_vm_numa_stat_handler,
1439                 .extra1                 = SYSCTL_ZERO,
1440                 .extra2                 = SYSCTL_ONE,
1441         },
1442 #endif
1443          {
1444                 .procname       = "hugetlb_shm_group",
1445                 .data           = &sysctl_hugetlb_shm_group,
1446                 .maxlen         = sizeof(gid_t),
1447                 .mode           = 0644,
1448                 .proc_handler   = proc_dointvec,
1449          },
1450         {
1451                 .procname       = "nr_overcommit_hugepages",
1452                 .data           = NULL,
1453                 .maxlen         = sizeof(unsigned long),
1454                 .mode           = 0644,
1455                 .proc_handler   = hugetlb_overcommit_handler,
1456         },
1457 #endif
1458         {
1459                 .procname       = "lowmem_reserve_ratio",
1460                 .data           = &sysctl_lowmem_reserve_ratio,
1461                 .maxlen         = sizeof(sysctl_lowmem_reserve_ratio),
1462                 .mode           = 0644,
1463                 .proc_handler   = lowmem_reserve_ratio_sysctl_handler,
1464         },
1465         {
1466                 .procname       = "drop_caches",
1467                 .data           = &sysctl_drop_caches,
1468                 .maxlen         = sizeof(int),
1469                 .mode           = 0200,
1470                 .proc_handler   = drop_caches_sysctl_handler,
1471                 .extra1         = SYSCTL_ONE,
1472                 .extra2         = &four,
1473         },
1474 #ifdef CONFIG_COMPACTION
1475         {
1476                 .procname       = "compact_memory",
1477                 .data           = &sysctl_compact_memory,
1478                 .maxlen         = sizeof(int),
1479                 .mode           = 0200,
1480                 .proc_handler   = sysctl_compaction_handler,
1481         },
1482         {
1483                 .procname       = "extfrag_threshold",
1484                 .data           = &sysctl_extfrag_threshold,
1485                 .maxlen         = sizeof(int),
1486                 .mode           = 0644,
1487                 .proc_handler   = proc_dointvec_minmax,
1488                 .extra1         = &min_extfrag_threshold,
1489                 .extra2         = &max_extfrag_threshold,
1490         },
1491         {
1492                 .procname       = "compact_unevictable_allowed",
1493                 .data           = &sysctl_compact_unevictable_allowed,
1494                 .maxlen         = sizeof(int),
1495                 .mode           = 0644,
1496                 .proc_handler   = proc_dointvec,
1497                 .extra1         = SYSCTL_ZERO,
1498                 .extra2         = SYSCTL_ONE,
1499         },
1500 
1501 #endif /* CONFIG_COMPACTION */
1502         {
1503                 .procname       = "min_free_kbytes",
1504                 .data           = &min_free_kbytes,
1505                 .maxlen         = sizeof(min_free_kbytes),
1506                 .mode           = 0644,
1507                 .proc_handler   = min_free_kbytes_sysctl_handler,
1508                 .extra1         = SYSCTL_ZERO,
1509         },
1510         {
1511                 .procname       = "watermark_boost_factor",
1512                 .data           = &watermark_boost_factor,
1513                 .maxlen         = sizeof(watermark_boost_factor),
1514                 .mode           = 0644,
1515                 .proc_handler   = watermark_boost_factor_sysctl_handler,
1516                 .extra1         = SYSCTL_ZERO,
1517         },
1518         {
1519                 .procname       = "watermark_scale_factor",
1520                 .data           = &watermark_scale_factor,
1521                 .maxlen         = sizeof(watermark_scale_factor),
1522                 .mode           = 0644,
1523                 .proc_handler   = watermark_scale_factor_sysctl_handler,
1524                 .extra1         = SYSCTL_ONE,
1525                 .extra2         = &one_thousand,
1526         },
1527         {
1528                 .procname       = "percpu_pagelist_fraction",
1529                 .data           = &percpu_pagelist_fraction,
1530                 .maxlen         = sizeof(percpu_pagelist_fraction),
1531                 .mode           = 0644,
1532                 .proc_handler   = percpu_pagelist_fraction_sysctl_handler,
1533                 .extra1         = SYSCTL_ZERO,
1534         },
1535 #ifdef CONFIG_MMU
1536         {
1537                 .procname       = "max_map_count",
1538                 .data           = &sysctl_max_map_count,
1539                 .maxlen         = sizeof(sysctl_max_map_count),
1540                 .mode           = 0644,
1541                 .proc_handler   = proc_dointvec_minmax,
1542                 .extra1         = SYSCTL_ZERO,
1543         },
1544 #else
1545         {
1546                 .procname       = "nr_trim_pages",
1547                 .data           = &sysctl_nr_trim_pages,
1548                 .maxlen         = sizeof(sysctl_nr_trim_pages),
1549                 .mode           = 0644,
1550                 .proc_handler   = proc_dointvec_minmax,
1551                 .extra1         = SYSCTL_ZERO,
1552         },
1553 #endif
1554         {
1555                 .procname       = "laptop_mode",
1556                 .data           = &laptop_mode,
1557                 .maxlen         = sizeof(laptop_mode),
1558                 .mode           = 0644,
1559                 .proc_handler   = proc_dointvec_jiffies,
1560         },
1561         {
1562                 .procname       = "block_dump",
1563                 .data           = &block_dump,
1564                 .maxlen         = sizeof(block_dump),
1565                 .mode           = 0644,
1566                 .proc_handler   = proc_dointvec,
1567                 .extra1         = SYSCTL_ZERO,
1568         },
1569         {
1570                 .procname       = "vfs_cache_pressure",
1571                 .data           = &sysctl_vfs_cache_pressure,
1572                 .maxlen         = sizeof(sysctl_vfs_cache_pressure),
1573                 .mode           = 0644,
1574                 .proc_handler   = proc_dointvec,
1575                 .extra1         = SYSCTL_ZERO,
1576         },
1577 #if defined(HAVE_ARCH_PICK_MMAP_LAYOUT) || \
1578     defined(CONFIG_ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT)
1579         {
1580                 .procname       = "legacy_va_layout",
1581                 .data           = &sysctl_legacy_va_layout,
1582                 .maxlen         = sizeof(sysctl_legacy_va_layout),
1583                 .mode           = 0644,
1584                 .proc_handler   = proc_dointvec,
1585                 .extra1         = SYSCTL_ZERO,
1586         },
1587 #endif
1588 #ifdef CONFIG_NUMA
1589         {
1590                 .procname       = "zone_reclaim_mode",
1591                 .data           = &node_reclaim_mode,
1592                 .maxlen         = sizeof(node_reclaim_mode),
1593                 .mode           = 0644,
1594                 .proc_handler   = proc_dointvec,
1595                 .extra1         = SYSCTL_ZERO,
1596         },
1597         {
1598                 .procname       = "min_unmapped_ratio",
1599                 .data           = &sysctl_min_unmapped_ratio,
1600                 .maxlen         = sizeof(sysctl_min_unmapped_ratio),
1601                 .mode           = 0644,
1602                 .proc_handler   = sysctl_min_unmapped_ratio_sysctl_handler,
1603                 .extra1         = SYSCTL_ZERO,
1604                 .extra2         = &one_hundred,
1605         },
1606         {
1607                 .procname       = "min_slab_ratio",
1608                 .data           = &sysctl_min_slab_ratio,
1609                 .maxlen         = sizeof(sysctl_min_slab_ratio),
1610                 .mode           = 0644,
1611                 .proc_handler   = sysctl_min_slab_ratio_sysctl_handler,
1612                 .extra1         = SYSCTL_ZERO,
1613                 .extra2         = &one_hundred,
1614         },
1615 #endif
1616 #ifdef CONFIG_SMP
1617         {
1618                 .procname       = "stat_interval",
1619                 .data           = &sysctl_stat_interval,
1620                 .maxlen         = sizeof(sysctl_stat_interval),
1621                 .mode           = 0644,
1622                 .proc_handler   = proc_dointvec_jiffies,
1623         },
1624         {
1625                 .procname       = "stat_refresh",
1626                 .data           = NULL,
1627                 .maxlen         = 0,
1628                 .mode           = 0600,
1629                 .proc_handler   = vmstat_refresh,
1630         },
1631 #endif
1632 #ifdef CONFIG_MMU
1633         {
1634                 .procname       = "mmap_min_addr",
1635                 .data           = &dac_mmap_min_addr,
1636                 .maxlen         = sizeof(unsigned long),
1637                 .mode           = 0644,
1638                 .proc_handler   = mmap_min_addr_handler,
1639         },
1640 #endif
1641 #ifdef CONFIG_NUMA
1642         {
1643                 .procname       = "numa_zonelist_order",
1644                 .data           = &numa_zonelist_order,
1645                 .maxlen         = NUMA_ZONELIST_ORDER_LEN,
1646                 .mode           = 0644,
1647                 .proc_handler   = numa_zonelist_order_handler,
1648         },
1649 #endif
1650 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1651    (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1652         {
1653                 .procname       = "vdso_enabled",
1654 #ifdef CONFIG_X86_32
1655                 .data           = &vdso32_enabled,
1656                 .maxlen         = sizeof(vdso32_enabled),
1657 #else
1658                 .data           = &vdso_enabled,
1659                 .maxlen         = sizeof(vdso_enabled),
1660 #endif
1661                 .mode           = 0644,
1662                 .proc_handler   = proc_dointvec,
1663                 .extra1         = SYSCTL_ZERO,
1664         },
1665 #endif
1666 #ifdef CONFIG_HIGHMEM
1667         {
1668                 .procname       = "highmem_is_dirtyable",
1669                 .data           = &vm_highmem_is_dirtyable,
1670                 .maxlen         = sizeof(vm_highmem_is_dirtyable),
1671                 .mode           = 0644,
1672                 .proc_handler   = proc_dointvec_minmax,
1673                 .extra1         = SYSCTL_ZERO,
1674                 .extra2         = SYSCTL_ONE,
1675         },
1676 #endif
1677 #ifdef CONFIG_MEMORY_FAILURE
1678         {
1679                 .procname       = "memory_failure_early_kill",
1680                 .data           = &sysctl_memory_failure_early_kill,
1681                 .maxlen         = sizeof(sysctl_memory_failure_early_kill),
1682                 .mode           = 0644,
1683                 .proc_handler   = proc_dointvec_minmax,
1684                 .extra1         = SYSCTL_ZERO,
1685                 .extra2         = SYSCTL_ONE,
1686         },
1687         {
1688                 .procname       = "memory_failure_recovery",
1689                 .data           = &sysctl_memory_failure_recovery,
1690                 .maxlen         = sizeof(sysctl_memory_failure_recovery),
1691                 .mode           = 0644,
1692                 .proc_handler   = proc_dointvec_minmax,
1693                 .extra1         = SYSCTL_ZERO,
1694                 .extra2         = SYSCTL_ONE,
1695         },
1696 #endif
1697         {
1698                 .procname       = "user_reserve_kbytes",
1699                 .data           = &sysctl_user_reserve_kbytes,
1700                 .maxlen         = sizeof(sysctl_user_reserve_kbytes),
1701                 .mode           = 0644,
1702                 .proc_handler   = proc_doulongvec_minmax,
1703         },
1704         {
1705                 .procname       = "admin_reserve_kbytes",
1706                 .data           = &sysctl_admin_reserve_kbytes,
1707                 .maxlen         = sizeof(sysctl_admin_reserve_kbytes),
1708                 .mode           = 0644,
1709                 .proc_handler   = proc_doulongvec_minmax,
1710         },
1711 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS
1712         {
1713                 .procname       = "mmap_rnd_bits",
1714                 .data           = &mmap_rnd_bits,
1715                 .maxlen         = sizeof(mmap_rnd_bits),
1716                 .mode           = 0600,
1717                 .proc_handler   = proc_dointvec_minmax,
1718                 .extra1         = (void *)&mmap_rnd_bits_min,
1719                 .extra2         = (void *)&mmap_rnd_bits_max,
1720         },
1721 #endif
1722 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS
1723         {
1724                 .procname       = "mmap_rnd_compat_bits",
1725                 .data           = &mmap_rnd_compat_bits,
1726                 .maxlen         = sizeof(mmap_rnd_compat_bits),
1727                 .mode           = 0600,
1728                 .proc_handler   = proc_dointvec_minmax,
1729                 .extra1         = (void *)&mmap_rnd_compat_bits_min,
1730                 .extra2         = (void *)&mmap_rnd_compat_bits_max,
1731         },
1732 #endif
1733 #ifdef CONFIG_USERFAULTFD
1734         {
1735                 .procname       = "unprivileged_userfaultfd",
1736                 .data           = &sysctl_unprivileged_userfaultfd,
1737                 .maxlen         = sizeof(sysctl_unprivileged_userfaultfd),
1738                 .mode           = 0644,
1739                 .proc_handler   = proc_dointvec_minmax,
1740                 .extra1         = SYSCTL_ZERO,
1741                 .extra2         = SYSCTL_ONE,
1742         },
1743 #endif
1744         { }
1745 };
1746 
1747 static struct ctl_table fs_table[] = {
1748         {
1749                 .procname       = "inode-nr",
1750                 .data           = &inodes_stat,
1751                 .maxlen         = 2*sizeof(long),
1752                 .mode           = 0444,
1753                 .proc_handler   = proc_nr_inodes,
1754         },
1755         {
1756                 .procname       = "inode-state",
1757                 .data           = &inodes_stat,
1758                 .maxlen         = 7*sizeof(long),
1759                 .mode           = 0444,
1760                 .proc_handler   = proc_nr_inodes,
1761         },
1762         {
1763                 .procname       = "file-nr",
1764                 .data           = &files_stat,
1765                 .maxlen         = sizeof(files_stat),
1766                 .mode           = 0444,
1767                 .proc_handler   = proc_nr_files,
1768         },
1769         {
1770                 .procname       = "file-max",
1771                 .data           = &files_stat.max_files,
1772                 .maxlen         = sizeof(files_stat.max_files),
1773                 .mode           = 0644,
1774                 .proc_handler   = proc_doulongvec_minmax,
1775                 .extra1         = &zero_ul,
1776                 .extra2         = &long_max,
1777         },
1778         {
1779                 .procname       = "nr_open",
1780                 .data           = &sysctl_nr_open,
1781                 .maxlen         = sizeof(unsigned int),
1782                 .mode           = 0644,
1783                 .proc_handler   = proc_dointvec_minmax,
1784                 .extra1         = &sysctl_nr_open_min,
1785                 .extra2         = &sysctl_nr_open_max,
1786         },
1787         {
1788                 .procname       = "dentry-state",
1789                 .data           = &dentry_stat,
1790                 .maxlen         = 6*sizeof(long),
1791                 .mode           = 0444,
1792                 .proc_handler   = proc_nr_dentry,
1793         },
1794         {
1795                 .procname       = "overflowuid",
1796                 .data           = &fs_overflowuid,
1797                 .maxlen         = sizeof(int),
1798                 .mode           = 0644,
1799                 .proc_handler   = proc_dointvec_minmax,
1800                 .extra1         = &minolduid,
1801                 .extra2         = &maxolduid,
1802         },
1803         {
1804                 .procname       = "overflowgid",
1805                 .data           = &fs_overflowgid,
1806                 .maxlen         = sizeof(int),
1807                 .mode           = 0644,
1808                 .proc_handler   = proc_dointvec_minmax,
1809                 .extra1         = &minolduid,
1810                 .extra2         = &maxolduid,
1811         },
1812 #ifdef CONFIG_FILE_LOCKING
1813         {
1814                 .procname       = "leases-enable",
1815                 .data           = &leases_enable,
1816                 .maxlen         = sizeof(int),
1817                 .mode           = 0644,
1818                 .proc_handler   = proc_dointvec,
1819         },
1820 #endif
1821 #ifdef CONFIG_DNOTIFY
1822         {
1823                 .procname       = "dir-notify-enable",
1824                 .data           = &dir_notify_enable,
1825                 .maxlen         = sizeof(int),
1826                 .mode           = 0644,
1827                 .proc_handler   = proc_dointvec,
1828         },
1829 #endif
1830 #ifdef CONFIG_MMU
1831 #ifdef CONFIG_FILE_LOCKING
1832         {
1833                 .procname       = "lease-break-time",
1834                 .data           = &lease_break_time,
1835                 .maxlen         = sizeof(int),
1836                 .mode           = 0644,
1837                 .proc_handler   = proc_dointvec,
1838         },
1839 #endif
1840 #ifdef CONFIG_AIO
1841         {
1842                 .procname       = "aio-nr",
1843                 .data           = &aio_nr,
1844                 .maxlen         = sizeof(aio_nr),
1845                 .mode           = 0444,
1846                 .proc_handler   = proc_doulongvec_minmax,
1847         },
1848         {
1849                 .procname       = "aio-max-nr",
1850                 .data           = &aio_max_nr,
1851                 .maxlen         = sizeof(aio_max_nr),
1852                 .mode           = 0644,
1853                 .proc_handler   = proc_doulongvec_minmax,
1854         },
1855 #endif /* CONFIG_AIO */
1856 #ifdef CONFIG_INOTIFY_USER
1857         {
1858                 .procname       = "inotify",
1859                 .mode           = 0555,
1860                 .child          = inotify_table,
1861         },
1862 #endif  
1863 #ifdef CONFIG_EPOLL
1864         {
1865                 .procname       = "epoll",
1866                 .mode           = 0555,
1867                 .child          = epoll_table,
1868         },
1869 #endif
1870 #endif
1871         {
1872                 .procname       = "protected_symlinks",
1873                 .data           = &sysctl_protected_symlinks,
1874                 .maxlen         = sizeof(int),
1875                 .mode           = 0600,
1876                 .proc_handler   = proc_dointvec_minmax,
1877                 .extra1         = SYSCTL_ZERO,
1878                 .extra2         = SYSCTL_ONE,
1879         },
1880         {
1881                 .procname       = "protected_hardlinks",
1882                 .data           = &sysctl_protected_hardlinks,
1883                 .maxlen         = sizeof(int),
1884                 .mode           = 0600,
1885                 .proc_handler   = proc_dointvec_minmax,
1886                 .extra1         = SYSCTL_ZERO,
1887                 .extra2         = SYSCTL_ONE,
1888         },
1889         {
1890                 .procname       = "protected_fifos",
1891                 .data           = &sysctl_protected_fifos,
1892                 .maxlen         = sizeof(int),
1893                 .mode           = 0600,
1894                 .proc_handler   = proc_dointvec_minmax,
1895                 .extra1         = SYSCTL_ZERO,
1896                 .extra2         = &two,
1897         },
1898         {
1899                 .procname       = "protected_regular",
1900                 .data           = &sysctl_protected_regular,
1901                 .maxlen         = sizeof(int),
1902                 .mode           = 0600,
1903                 .proc_handler   = proc_dointvec_minmax,
1904                 .extra1         = SYSCTL_ZERO,
1905                 .extra2         = &two,
1906         },
1907         {
1908                 .procname       = "suid_dumpable",
1909                 .data           = &suid_dumpable,
1910                 .maxlen         = sizeof(int),
1911                 .mode           = 0644,
1912                 .proc_handler   = proc_dointvec_minmax_coredump,
1913                 .extra1         = SYSCTL_ZERO,
1914                 .extra2         = &two,
1915         },
1916 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1917         {
1918                 .procname       = "binfmt_misc",
1919                 .mode           = 0555,
1920                 .child          = sysctl_mount_point,
1921         },
1922 #endif
1923         {
1924                 .procname       = "pipe-max-size",
1925                 .data           = &pipe_max_size,
1926                 .maxlen         = sizeof(pipe_max_size),
1927                 .mode           = 0644,
1928                 .proc_handler   = proc_dopipe_max_size,
1929         },
1930         {
1931                 .procname       = "pipe-user-pages-hard",
1932                 .data           = &pipe_user_pages_hard,
1933                 .maxlen         = sizeof(pipe_user_pages_hard),
1934                 .mode           = 0644,
1935                 .proc_handler   = proc_doulongvec_minmax,
1936         },
1937         {
1938                 .procname       = "pipe-user-pages-soft",
1939                 .data           = &pipe_user_pages_soft,
1940                 .maxlen         = sizeof(pipe_user_pages_soft),
1941                 .mode           = 0644,
1942                 .proc_handler   = proc_doulongvec_minmax,
1943         },
1944         {
1945                 .procname       = "mount-max",
1946                 .data           = &sysctl_mount_max,
1947                 .maxlen         = sizeof(unsigned int),
1948                 .mode           = 0644,
1949                 .proc_handler   = proc_dointvec_minmax,
1950                 .extra1         = SYSCTL_ONE,
1951         },
1952         { }
1953 };
1954 
1955 static struct ctl_table debug_table[] = {
1956 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1957         {
1958                 .procname       = "exception-trace",
1959                 .data           = &show_unhandled_signals,
1960                 .maxlen         = sizeof(int),
1961                 .mode           = 0644,
1962                 .proc_handler   = proc_dointvec
1963         },
1964 #endif
1965 #if defined(CONFIG_OPTPROBES)
1966         {
1967                 .procname       = "kprobes-optimization",
1968                 .data           = &sysctl_kprobes_optimization,
1969                 .maxlen         = sizeof(int),
1970                 .mode           = 0644,
1971                 .proc_handler   = proc_kprobes_optimization_handler,
1972                 .extra1         = SYSCTL_ZERO,
1973                 .extra2         = SYSCTL_ONE,
1974         },
1975 #endif
1976         { }
1977 };
1978 
1979 static struct ctl_table dev_table[] = {
1980         { }
1981 };
1982 
1983 int __init sysctl_init(void)
1984 {
1985         struct ctl_table_header *hdr;
1986 
1987         hdr = register_sysctl_table(sysctl_base_table);
1988         kmemleak_not_leak(hdr);
1989         return 0;
1990 }
1991 
1992 #endif /* CONFIG_SYSCTL */
1993 
1994 /*
1995  * /proc/sys support
1996  */
1997 
1998 #ifdef CONFIG_PROC_SYSCTL
1999 
2000 static int _proc_do_string(char *data, int maxlen, int write,
2001                            char __user *buffer,
2002                            size_t *lenp, loff_t *ppos)
2003 {
2004         size_t len;
2005         char __user *p;
2006         char c;
2007 
2008         if (!data || !maxlen || !*lenp) {
2009                 *lenp = 0;
2010                 return 0;
2011         }
2012 
2013         if (write) {
2014                 if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) {
2015                         /* Only continue writes not past the end of buffer. */
2016                         len = strlen(data);
2017                         if (len > maxlen - 1)
2018                                 len = maxlen - 1;
2019 
2020                         if (*ppos > len)
2021                                 return 0;
2022                         len = *ppos;
2023                 } else {
2024                         /* Start writing from beginning of buffer. */
2025                         len = 0;
2026                 }
2027 
2028                 *ppos += *lenp;
2029                 p = buffer;
2030                 while ((p - buffer) < *lenp && len < maxlen - 1) {
2031                         if (get_user(c, p++))
2032                                 return -EFAULT;
2033                         if (c == 0 || c == '\n')
2034                                 break;
2035                         data[len++] = c;
2036                 }
2037                 data[len] = 0;
2038         } else {
2039                 len = strlen(data);
2040                 if (len > maxlen)
2041                         len = maxlen;
2042 
2043                 if (*ppos > len) {
2044                         *lenp = 0;
2045                         return 0;
2046                 }
2047 
2048                 data += *ppos;
2049                 len  -= *ppos;
2050 
2051                 if (len > *lenp)
2052                         len = *lenp;
2053                 if (len)
2054                         if (copy_to_user(buffer, data, len))
2055                                 return -EFAULT;
2056                 if (len < *lenp) {
2057                         if (put_user('\n', buffer + len))
2058                                 return -EFAULT;
2059                         len++;
2060                 }
2061                 *lenp = len;
2062                 *ppos += len;
2063         }
2064         return 0;
2065 }
2066 
2067 static void warn_sysctl_write(struct ctl_table *table)
2068 {
2069         pr_warn_once("%s wrote to %s when file position was not 0!\n"
2070                 "This will not be supported in the future. To silence this\n"
2071                 "warning, set kernel.sysctl_writes_strict = -1\n",
2072                 current->comm, table->procname);
2073 }
2074 
2075 /**
2076  * proc_first_pos_non_zero_ignore - check if first position is allowed
2077  * @ppos: file position
2078  * @table: the sysctl table
2079  *
2080  * Returns true if the first position is non-zero and the sysctl_writes_strict
2081  * mode indicates this is not allowed for numeric input types. String proc
2082  * handlers can ignore the return value.
2083  */
2084 static bool proc_first_pos_non_zero_ignore(loff_t *ppos,
2085                                            struct ctl_table *table)
2086 {
2087         if (!*ppos)
2088                 return false;
2089 
2090         switch (sysctl_writes_strict) {
2091         case SYSCTL_WRITES_STRICT:
2092                 return true;
2093         case SYSCTL_WRITES_WARN:
2094                 warn_sysctl_write(table);
2095                 return false;
2096         default:
2097                 return false;
2098         }
2099 }
2100 
2101 /**
2102  * proc_dostring - read a string sysctl
2103  * @table: the sysctl table
2104  * @write: %TRUE if this is a write to the sysctl file
2105  * @buffer: the user buffer
2106  * @lenp: the size of the user buffer
2107  * @ppos: file position
2108  *
2109  * Reads/writes a string from/to the user buffer. If the kernel
2110  * buffer provided is not large enough to hold the string, the
2111  * string is truncated. The copied string is %NULL-terminated.
2112  * If the string is being read by the user process, it is copied
2113  * and a newline '\n' is added. It is truncated if the buffer is
2114  * not large enough.
2115  *
2116  * Returns 0 on success.
2117  */
2118 int proc_dostring(struct ctl_table *table, int write,
2119                   void __user *buffer, size_t *lenp, loff_t *ppos)
2120 {
2121         if (write)
2122                 proc_first_pos_non_zero_ignore(ppos, table);
2123 
2124         return _proc_do_string((char *)(table->data), table->maxlen, write,
2125                                (char __user *)buffer, lenp, ppos);
2126 }
2127 
2128 static size_t proc_skip_spaces(char **buf)
2129 {
2130         size_t ret;
2131         char *tmp = skip_spaces(*buf);
2132         ret = tmp - *buf;
2133         *buf = tmp;
2134         return ret;
2135 }
2136 
2137 static void proc_skip_char(char **buf, size_t *size, const char v)
2138 {
2139         while (*size) {
2140                 if (**buf != v)
2141                         break;
2142                 (*size)--;
2143                 (*buf)++;
2144         }
2145 }
2146 
2147 /**
2148  * strtoul_lenient - parse an ASCII formatted integer from a buffer and only
2149  *                   fail on overflow
2150  *
2151  * @cp: kernel buffer containing the string to parse
2152  * @endp: pointer to store the trailing characters
2153  * @base: the base to use
2154  * @res: where the parsed integer will be stored
2155  *
2156  * In case of success 0 is returned and @res will contain the parsed integer,
2157  * @endp will hold any trailing characters.
2158  * This function will fail the parse on overflow. If there wasn't an overflow
2159  * the function will defer the decision what characters count as invalid to the
2160  * caller.
2161  */
2162 static int strtoul_lenient(const char *cp, char **endp, unsigned int base,
2163                            unsigned long *res)
2164 {
2165         unsigned long long result;
2166         unsigned int rv;
2167 
2168         cp = _parse_integer_fixup_radix(cp, &base);
2169         rv = _parse_integer(cp, base, &result);
2170         if ((rv & KSTRTOX_OVERFLOW) || (result != (unsigned long)result))
2171                 return -ERANGE;
2172 
2173         cp += rv;
2174 
2175         if (endp)
2176                 *endp = (char *)cp;
2177 
2178         *res = (unsigned long)result;
2179         return 0;
2180 }
2181 
2182 #define TMPBUFLEN 22
2183 /**
2184  * proc_get_long - reads an ASCII formatted integer from a user buffer
2185  *
2186  * @buf: a kernel buffer
2187  * @size: size of the kernel buffer
2188  * @val: this is where the number will be stored
2189  * @neg: set to %TRUE if number is negative
2190  * @perm_tr: a vector which contains the allowed trailers
2191  * @perm_tr_len: size of the perm_tr vector
2192  * @tr: pointer to store the trailer character
2193  *
2194  * In case of success %0 is returned and @buf and @size are updated with
2195  * the amount of bytes read. If @tr is non-NULL and a trailing
2196  * character exists (size is non-zero after returning from this
2197  * function), @tr is updated with the trailing character.
2198  */
2199 static int proc_get_long(char **buf, size_t *size,
2200                           unsigned long *val, bool *neg,
2201                           const char *perm_tr, unsigned perm_tr_len, char *tr)
2202 {
2203         int len;
2204         char *p, tmp[TMPBUFLEN];
2205 
2206         if (!*size)
2207                 return -EINVAL;
2208 
2209         len = *size;
2210         if (len > TMPBUFLEN - 1)
2211                 len = TMPBUFLEN - 1;
2212 
2213         memcpy(tmp, *buf, len);
2214 
2215         tmp[len] = 0;
2216         p = tmp;
2217         if (*p == '-' && *size > 1) {
2218                 *neg = true;
2219                 p++;
2220         } else
2221                 *neg = false;
2222         if (!isdigit(*p))
2223                 return -EINVAL;
2224 
2225         if (strtoul_lenient(p, &p, 0, val))
2226                 return -EINVAL;
2227 
2228         len = p - tmp;
2229 
2230         /* We don't know if the next char is whitespace thus we may accept
2231          * invalid integers (e.g. 1234...a) or two integers instead of one
2232          * (e.g. 123...1). So lets not allow such large numbers. */
2233         if (len == TMPBUFLEN - 1)
2234                 return -EINVAL;
2235 
2236         if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
2237                 return -EINVAL;
2238 
2239         if (tr && (len < *size))
2240                 *tr = *p;
2241 
2242         *buf += len;
2243         *size -= len;
2244 
2245         return 0;
2246 }
2247 
2248 /**
2249  * proc_put_long - converts an integer to a decimal ASCII formatted string
2250  *
2251  * @buf: the user buffer
2252  * @size: the size of the user buffer
2253  * @val: the integer to be converted
2254  * @neg: sign of the number, %TRUE for negative
2255  *
2256  * In case of success %0 is returned and @buf and @size are updated with
2257  * the amount of bytes written.
2258  */
2259 static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
2260                           bool neg)
2261 {
2262         int len;
2263         char tmp[TMPBUFLEN], *p = tmp;
2264 
2265         sprintf(p, "%s%lu", neg ? "-" : "", val);
2266         len = strlen(tmp);
2267         if (len > *size)
2268                 len = *size;
2269         if (copy_to_user(*buf, tmp, len))
2270                 return -EFAULT;
2271         *size -= len;
2272         *buf += len;
2273         return 0;
2274 }
2275 #undef TMPBUFLEN
2276 
2277 static int proc_put_char(void __user **buf, size_t *size, char c)
2278 {
2279         if (*size) {
2280                 char __user **buffer = (char __user **)buf;
2281                 if (put_user(c, *buffer))
2282                         return -EFAULT;
2283                 (*size)--, (*buffer)++;
2284                 *buf = *buffer;
2285         }
2286         return 0;
2287 }
2288 
2289 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
2290                                  int *valp,
2291                                  int write, void *data)
2292 {
2293         if (write) {
2294                 if (*negp) {
2295                         if (*lvalp > (unsigned long) INT_MAX + 1)
2296                                 return -EINVAL;
2297                         *valp = -*lvalp;
2298                 } else {
2299                         if (*lvalp > (unsigned long) INT_MAX)
2300                                 return -EINVAL;
2301                         *valp = *lvalp;
2302                 }
2303         } else {
2304                 int val = *valp;
2305                 if (val < 0) {
2306                         *negp = true;
2307                         *lvalp = -(unsigned long)val;
2308                 } else {
2309                         *negp = false;
2310                         *lvalp = (unsigned long)val;
2311                 }
2312         }
2313         return 0;
2314 }
2315 
2316 static int do_proc_douintvec_conv(unsigned long *lvalp,
2317                                   unsigned int *valp,
2318                                   int write, void *data)
2319 {
2320         if (write) {
2321                 if (*lvalp > UINT_MAX)
2322                         return -EINVAL;
2323                 *valp = *lvalp;
2324         } else {
2325                 unsigned int val = *valp;
2326                 *lvalp = (unsigned long)val;
2327         }
2328         return 0;
2329 }
2330 
2331 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
2332 
2333 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
2334                   int write, void __user *buffer,
2335                   size_t *lenp, loff_t *ppos,
2336                   int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2337                               int write, void *data),
2338                   void *data)
2339 {
2340         int *i, vleft, first = 1, err = 0;
2341         size_t left;
2342         char *kbuf = NULL, *p;
2343         
2344         if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
2345                 *lenp = 0;
2346                 return 0;
2347         }
2348         
2349         i = (int *) tbl_data;
2350         vleft = table->maxlen / sizeof(*i);
2351         left = *lenp;
2352 
2353         if (!conv)
2354                 conv = do_proc_dointvec_conv;
2355 
2356         if (write) {
2357                 if (proc_first_pos_non_zero_ignore(ppos, table))
2358                         goto out;
2359 
2360                 if (left > PAGE_SIZE - 1)
2361                         left = PAGE_SIZE - 1;
2362                 p = kbuf = memdup_user_nul(buffer, left);
2363                 if (IS_ERR(kbuf))
2364                         return PTR_ERR(kbuf);
2365         }
2366 
2367         for (; left && vleft--; i++, first=0) {
2368                 unsigned long lval;
2369                 bool neg;
2370 
2371                 if (write) {
2372                         left -= proc_skip_spaces(&p);
2373 
2374                         if (!left)
2375                                 break;
2376                         err = proc_get_long(&p, &left, &lval, &neg,
2377                                              proc_wspace_sep,
2378                                              sizeof(proc_wspace_sep), NULL);
2379                         if (err)
2380                                 break;
2381                         if (conv(&neg, &lval, i, 1, data)) {
2382                                 err = -EINVAL;
2383                                 break;
2384                         }
2385                 } else {
2386                         if (conv(&neg, &lval, i, 0, data)) {
2387                                 err = -EINVAL;
2388                                 break;
2389                         }
2390                         if (!first)
2391                                 err = proc_put_char(&buffer, &left, '\t');
2392                         if (err)
2393                                 break;
2394                         err = proc_put_long(&buffer, &left, lval, neg);
2395                         if (err)
2396                                 break;
2397                 }
2398         }
2399 
2400         if (!write && !first && left && !err)
2401                 err = proc_put_char(&buffer, &left, '\n');
2402         if (write && !err && left)
2403                 left -= proc_skip_spaces(&p);
2404         if (write) {
2405                 kfree(kbuf);
2406                 if (first)
2407                         return err ? : -EINVAL;
2408         }
2409         *lenp -= left;
2410 out:
2411         *ppos += *lenp;
2412         return err;
2413 }
2414 
2415 static int do_proc_dointvec(struct ctl_table *table, int write,
2416                   void __user *buffer, size_t *lenp, loff_t *ppos,
2417                   int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2418                               int write, void *data),
2419                   void *data)
2420 {
2421         return __do_proc_dointvec(table->data, table, write,
2422                         buffer, lenp, ppos, conv, data);
2423 }
2424 
2425 static int do_proc_douintvec_w(unsigned int *tbl_data,
2426                                struct ctl_table *table,
2427                                void __user *buffer,
2428                                size_t *lenp, loff_t *ppos,
2429                                int (*conv)(unsigned long *lvalp,
2430                                            unsigned int *valp,
2431                                            int write, void *data),
2432                                void *data)
2433 {
2434         unsigned long lval;
2435         int err = 0;
2436         size_t left;
2437         bool neg;
2438         char *kbuf = NULL, *p;
2439 
2440         left = *lenp;
2441 
2442         if (proc_first_pos_non_zero_ignore(ppos, table))
2443                 goto bail_early;
2444 
2445         if (left > PAGE_SIZE - 1)
2446                 left = PAGE_SIZE - 1;
2447 
2448         p = kbuf = memdup_user_nul(buffer, left);
2449         if (IS_ERR(kbuf))
2450                 return -EINVAL;
2451 
2452         left -= proc_skip_spaces(&p);
2453         if (!left) {
2454                 err = -EINVAL;
2455                 goto out_free;
2456         }
2457 
2458         err = proc_get_long(&p, &left, &lval, &neg,
2459                              proc_wspace_sep,
2460                              sizeof(proc_wspace_sep), NULL);
2461         if (err || neg) {
2462                 err = -EINVAL;
2463                 goto out_free;
2464         }
2465 
2466         if (conv(&lval, tbl_data, 1, data)) {
2467                 err = -EINVAL;
2468                 goto out_free;
2469         }
2470 
2471         if (!err && left)
2472                 left -= proc_skip_spaces(&p);
2473 
2474 out_free:
2475         kfree(kbuf);
2476         if (err)
2477                 return -EINVAL;
2478 
2479         return 0;
2480 
2481         /* This is in keeping with old __do_proc_dointvec() */
2482 bail_early:
2483         *ppos += *lenp;
2484         return err;
2485 }
2486 
2487 static int do_proc_douintvec_r(unsigned int *tbl_data, void __user *buffer,
2488                                size_t *lenp, loff_t *ppos,
2489                                int (*conv)(unsigned long *lvalp,
2490                                            unsigned int *valp,
2491                                            int write, void *data),
2492                                void *data)
2493 {
2494         unsigned long lval;
2495         int err = 0;
2496         size_t left;
2497 
2498         left = *lenp;
2499 
2500         if (conv(&lval, tbl_data, 0, data)) {
2501                 err = -EINVAL;
2502                 goto out;
2503         }
2504 
2505         err = proc_put_long(&buffer, &left, lval, false);
2506         if (err || !left)
2507                 goto out;
2508 
2509         err = proc_put_char(&buffer, &left, '\n');
2510 
2511 out:
2512         *lenp -= left;
2513         *ppos += *lenp;
2514 
2515         return err;
2516 }
2517 
2518 static int __do_proc_douintvec(void *tbl_data, struct ctl_table *table,
2519                                int write, void __user *buffer,
2520                                size_t *lenp, loff_t *ppos,
2521                                int (*conv)(unsigned long *lvalp,
2522                                            unsigned int *valp,
2523                                            int write, void *data),
2524                                void *data)
2525 {
2526         unsigned int *i, vleft;
2527 
2528         if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
2529                 *lenp = 0;
2530                 return 0;
2531         }
2532 
2533         i = (unsigned int *) tbl_data;
2534         vleft = table->maxlen / sizeof(*i);
2535 
2536         /*
2537          * Arrays are not supported, keep this simple. *Do not* add
2538          * support for them.
2539          */
2540         if (vleft != 1) {
2541                 *lenp = 0;
2542                 return -EINVAL;
2543         }
2544 
2545         if (!conv)
2546                 conv = do_proc_douintvec_conv;
2547 
2548         if (write)
2549                 return do_proc_douintvec_w(i, table, buffer, lenp, ppos,
2550                                            conv, data);
2551         return do_proc_douintvec_r(i, buffer, lenp, ppos, conv, data);
2552 }
2553 
2554 static int do_proc_douintvec(struct ctl_table *table, int write,
2555                              void __user *buffer, size_t *lenp, loff_t *ppos,
2556                              int (*conv)(unsigned long *lvalp,
2557                                          unsigned int *valp,
2558                                          int write, void *data),
2559                              void *data)
2560 {
2561         return __do_proc_douintvec(table->data, table, write,
2562                                    buffer, lenp, ppos, conv, data);
2563 }
2564 
2565 /**
2566  * proc_dointvec - read a vector of integers
2567  * @table: the sysctl table
2568  * @write: %TRUE if this is a write to the sysctl file
2569  * @buffer: the user buffer
2570  * @lenp: the size of the user buffer
2571  * @ppos: file position
2572  *
2573  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2574  * values from/to the user buffer, treated as an ASCII string. 
2575  *
2576  * Returns 0 on success.
2577  */
2578 int proc_dointvec(struct ctl_table *table, int write,
2579                      void __user *buffer, size_t *lenp, loff_t *ppos)
2580 {
2581         return do_proc_dointvec(table, write, buffer, lenp, ppos, NULL, NULL);
2582 }
2583 
2584 /**
2585  * proc_douintvec - read a vector of unsigned integers
2586  * @table: the sysctl table
2587  * @write: %TRUE if this is a write to the sysctl file
2588  * @buffer: the user buffer
2589  * @lenp: the size of the user buffer
2590  * @ppos: file position
2591  *
2592  * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
2593  * values from/to the user buffer, treated as an ASCII string.
2594  *
2595  * Returns 0 on success.
2596  */
2597 int proc_douintvec(struct ctl_table *table, int write,
2598                      void __user *buffer, size_t *lenp, loff_t *ppos)
2599 {
2600         return do_proc_douintvec(table, write, buffer, lenp, ppos,
2601                                  do_proc_douintvec_conv, NULL);
2602 }
2603 
2604 /*
2605  * Taint values can only be increased
2606  * This means we can safely use a temporary.
2607  */
2608 static int proc_taint(struct ctl_table *table, int write,
2609                                void __user *buffer, size_t *lenp, loff_t *ppos)
2610 {
2611         struct ctl_table t;
2612         unsigned long tmptaint = get_taint();
2613         int err;
2614 
2615         if (write && !capable(CAP_SYS_ADMIN))
2616                 return -EPERM;
2617 
2618         t = *table;
2619         t.data = &tmptaint;
2620         err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2621         if (err < 0)
2622                 return err;
2623 
2624         if (write) {
2625                 /*
2626                  * Poor man's atomic or. Not worth adding a primitive
2627                  * to everyone's atomic.h for this
2628                  */
2629                 int i;
2630                 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2631                         if ((tmptaint >> i) & 1)
2632                                 add_taint(i, LOCKDEP_STILL_OK);
2633                 }
2634         }
2635 
2636         return err;
2637 }
2638 
2639 #ifdef CONFIG_PRINTK
2640 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
2641                                 void __user *buffer, size_t *lenp, loff_t *ppos)
2642 {
2643         if (write && !capable(CAP_SYS_ADMIN))
2644                 return -EPERM;
2645 
2646         return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2647 }
2648 #endif
2649 
2650 /**
2651  * struct do_proc_dointvec_minmax_conv_param - proc_dointvec_minmax() range checking structure
2652  * @min: pointer to minimum allowable value
2653  * @max: pointer to maximum allowable value
2654  *
2655  * The do_proc_dointvec_minmax_conv_param structure provides the
2656  * minimum and maximum values for doing range checking for those sysctl
2657  * parameters that use the proc_dointvec_minmax() handler.
2658  */
2659 struct do_proc_dointvec_minmax_conv_param {
2660         int *min;
2661         int *max;
2662 };
2663 
2664 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2665                                         int *valp,
2666                                         int write, void *data)
2667 {
2668         int tmp, ret;
2669         struct do_proc_dointvec_minmax_conv_param *param = data;
2670         /*
2671          * If writing, first do so via a temporary local int so we can
2672          * bounds-check it before touching *valp.
2673          */
2674         int *ip = write ? &tmp : valp;
2675 
2676         ret = do_proc_dointvec_conv(negp, lvalp, ip, write, data);
2677         if (ret)
2678                 return ret;
2679 
2680         if (write) {
2681                 if ((param->min && *param->min > tmp) ||
2682                     (param->max && *param->max < tmp))
2683                         return -EINVAL;
2684                 *valp = tmp;
2685         }
2686 
2687         return 0;
2688 }
2689 
2690 /**
2691  * proc_dointvec_minmax - read a vector of integers with min/max values
2692  * @table: the sysctl table
2693  * @write: %TRUE if this is a write to the sysctl file
2694  * @buffer: the user buffer
2695  * @lenp: the size of the user buffer
2696  * @ppos: file position
2697  *
2698  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2699  * values from/to the user buffer, treated as an ASCII string.
2700  *
2701  * This routine will ensure the values are within the range specified by
2702  * table->extra1 (min) and table->extra2 (max).
2703  *
2704  * Returns 0 on success or -EINVAL on write when the range check fails.
2705  */
2706 int proc_dointvec_minmax(struct ctl_table *table, int write,
2707                   void __user *buffer, size_t *lenp, loff_t *ppos)
2708 {
2709         struct do_proc_dointvec_minmax_conv_param param = {
2710                 .min = (int *) table->extra1,
2711                 .max = (int *) table->extra2,
2712         };
2713         return do_proc_dointvec(table, write, buffer, lenp, ppos,
2714                                 do_proc_dointvec_minmax_conv, &param);
2715 }
2716 
2717 /**
2718  * struct do_proc_douintvec_minmax_conv_param - proc_douintvec_minmax() range checking structure
2719  * @min: pointer to minimum allowable value
2720  * @max: pointer to maximum allowable value
2721  *
2722  * The do_proc_douintvec_minmax_conv_param structure provides the
2723  * minimum and maximum values for doing range checking for those sysctl
2724  * parameters that use the proc_douintvec_minmax() handler.
2725  */
2726 struct do_proc_douintvec_minmax_conv_param {
2727         unsigned int *min;
2728         unsigned int *max;
2729 };
2730 
2731 static int do_proc_douintvec_minmax_conv(unsigned long *lvalp,
2732                                          unsigned int *valp,
2733                                          int write, void *data)
2734 {
2735         int ret;
2736         unsigned int tmp;
2737         struct do_proc_douintvec_minmax_conv_param *param = data;
2738         /* write via temporary local uint for bounds-checking */
2739         unsigned int *up = write ? &tmp : valp;
2740 
2741         ret = do_proc_douintvec_conv(lvalp, up, write, data);
2742         if (ret)
2743                 return ret;
2744 
2745         if (write) {
2746                 if ((param->min && *param->min > tmp) ||
2747                     (param->max && *param->max < tmp))
2748                         return -ERANGE;
2749 
2750                 *valp = tmp;
2751         }
2752 
2753         return 0;
2754 }
2755 
2756 /**
2757  * proc_douintvec_minmax - read a vector of unsigned ints with min/max values
2758  * @table: the sysctl table
2759  * @write: %TRUE if this is a write to the sysctl file
2760  * @buffer: the user buffer
2761  * @lenp: the size of the user buffer
2762  * @ppos: file position
2763  *
2764  * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
2765  * values from/to the user buffer, treated as an ASCII string. Negative
2766  * strings are not allowed.
2767  *
2768  * This routine will ensure the values are within the range specified by
2769  * table->extra1 (min) and table->extra2 (max). There is a final sanity
2770  * check for UINT_MAX to avoid having to support wrap around uses from
2771  * userspace.
2772  *
2773  * Returns 0 on success or -ERANGE on write when the range check fails.
2774  */
2775 int proc_douintvec_minmax(struct ctl_table *table, int write,
2776                           void __user *buffer, size_t *lenp, loff_t *ppos)
2777 {
2778         struct do_proc_douintvec_minmax_conv_param param = {
2779                 .min = (unsigned int *) table->extra1,
2780                 .max = (unsigned int *) table->extra2,
2781         };
2782         return do_proc_douintvec(table, write, buffer, lenp, ppos,
2783                                  do_proc_douintvec_minmax_conv, &param);
2784 }
2785 
2786 static int do_proc_dopipe_max_size_conv(unsigned long *lvalp,
2787                                         unsigned int *valp,
2788                                         int write, void *data)
2789 {
2790         if (write) {
2791                 unsigned int val;
2792 
2793                 val = round_pipe_size(*lvalp);
2794                 if (val == 0)
2795                         return -EINVAL;
2796 
2797                 *valp = val;
2798         } else {
2799                 unsigned int val = *valp;
2800                 *lvalp = (unsigned long) val;
2801         }
2802 
2803         return 0;
2804 }
2805 
2806 static int proc_dopipe_max_size(struct ctl_table *table, int write,
2807                                 void __user *buffer, size_t *lenp, loff_t *ppos)
2808 {
2809         return do_proc_douintvec(table, write, buffer, lenp, ppos,
2810                                  do_proc_dopipe_max_size_conv, NULL);
2811 }
2812 
2813 static void validate_coredump_safety(void)
2814 {
2815 #ifdef CONFIG_COREDUMP
2816         if (suid_dumpable == SUID_DUMP_ROOT &&
2817             core_pattern[0] != '/' && core_pattern[0] != '|') {
2818                 printk(KERN_WARNING
2819 "Unsafe core_pattern used with fs.suid_dumpable=2.\n"
2820 "Pipe handler or fully qualified core dump path required.\n"
2821 "Set kernel.core_pattern before fs.suid_dumpable.\n"
2822                 );
2823         }
2824 #endif
2825 }
2826 
2827 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2828                 void __user *buffer, size_t *lenp, loff_t *ppos)
2829 {
2830         int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2831         if (!error)
2832                 validate_coredump_safety();
2833         return error;
2834 }
2835 
2836 #ifdef CONFIG_COREDUMP
2837 static int proc_dostring_coredump(struct ctl_table *table, int write,
2838                   void __user *buffer, size_t *lenp, loff_t *ppos)
2839 {
2840         int error = proc_dostring(table, write, buffer, lenp, ppos);
2841         if (!error)
2842                 validate_coredump_safety();
2843         return error;
2844 }
2845 #endif
2846 
2847 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2848                                      void __user *buffer,
2849                                      size_t *lenp, loff_t *ppos,
2850                                      unsigned long convmul,
2851                                      unsigned long convdiv)
2852 {
2853         unsigned long *i, *min, *max;
2854         int vleft, first = 1, err = 0;
2855         size_t left;
2856         char *kbuf = NULL, *p;
2857 
2858         if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2859                 *lenp = 0;
2860                 return 0;
2861         }
2862 
2863         i = (unsigned long *) data;
2864         min = (unsigned long *) table->extra1;
2865         max = (unsigned long *) table->extra2;
2866         vleft = table->maxlen / sizeof(unsigned long);
2867         left = *lenp;
2868 
2869         if (write) {
2870                 if (proc_first_pos_non_zero_ignore(ppos, table))
2871                         goto out;
2872 
2873                 if (left > PAGE_SIZE - 1)
2874                         left = PAGE_SIZE - 1;
2875                 p = kbuf = memdup_user_nul(buffer, left);
2876                 if (IS_ERR(kbuf))
2877                         return PTR_ERR(kbuf);
2878         }
2879 
2880         for (; left && vleft--; i++, first = 0) {
2881                 unsigned long val;
2882 
2883                 if (write) {
2884                         bool neg;
2885 
2886                         left -= proc_skip_spaces(&p);
2887                         if (!left)
2888                                 break;
2889 
2890                         err = proc_get_long(&p, &left, &val, &neg,
2891                                              proc_wspace_sep,
2892                                              sizeof(proc_wspace_sep), NULL);
2893                         if (err)
2894                                 break;
2895                         if (neg)
2896                                 continue;
2897                         val = convmul * val / convdiv;
2898                         if ((min && val < *min) || (max && val > *max)) {
2899                                 err = -EINVAL;
2900                                 break;
2901                         }
2902                         *i = val;
2903                 } else {
2904                         val = convdiv * (*i) / convmul;
2905                         if (!first) {
2906                                 err = proc_put_char(&buffer, &left, '\t');
2907                                 if (err)
2908                                         break;
2909                         }
2910                         err = proc_put_long(&buffer, &left, val, false);
2911                         if (err)
2912                                 break;
2913                 }
2914         }
2915 
2916         if (!write && !first && left && !err)
2917                 err = proc_put_char(&buffer, &left, '\n');
2918         if (write && !err)
2919                 left -= proc_skip_spaces(&p);
2920         if (write) {
2921                 kfree(kbuf);
2922                 if (first)
2923                         return err ? : -EINVAL;
2924         }
2925         *lenp -= left;
2926 out:
2927         *ppos += *lenp;
2928         return err;
2929 }
2930 
2931 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2932                                      void __user *buffer,
2933                                      size_t *lenp, loff_t *ppos,
2934                                      unsigned long convmul,
2935                                      unsigned long convdiv)
2936 {
2937         return __do_proc_doulongvec_minmax(table->data, table, write,
2938                         buffer, lenp, ppos, convmul, convdiv);
2939 }
2940 
2941 /**
2942  * proc_doulongvec_minmax - read a vector of long integers with min/max values
2943  * @table: the sysctl table
2944  * @write: %TRUE if this is a write to the sysctl file
2945  * @buffer: the user buffer
2946  * @lenp: the size of the user buffer
2947  * @ppos: file position
2948  *
2949  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2950  * values from/to the user buffer, treated as an ASCII string.
2951  *
2952  * This routine will ensure the values are within the range specified by
2953  * table->extra1 (min) and table->extra2 (max).
2954  *
2955  * Returns 0 on success.
2956  */
2957 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2958                            void __user *buffer, size_t *lenp, loff_t *ppos)
2959 {
2960     return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2961 }
2962 
2963 /**
2964  * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2965  * @table: the sysctl table
2966  * @write: %TRUE if this is a write to the sysctl file
2967  * @buffer: the user buffer
2968  * @lenp: the size of the user buffer
2969  * @ppos: file position
2970  *
2971  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2972  * values from/to the user buffer, treated as an ASCII string. The values
2973  * are treated as milliseconds, and converted to jiffies when they are stored.
2974  *
2975  * This routine will ensure the values are within the range specified by
2976  * table->extra1 (min) and table->extra2 (max).
2977  *
2978  * Returns 0 on success.
2979  */
2980 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2981                                       void __user *buffer,
2982                                       size_t *lenp, loff_t *ppos)
2983 {
2984     return do_proc_doulongvec_minmax(table, write, buffer,
2985                                      lenp, ppos, HZ, 1000l);
2986 }
2987 
2988 
2989 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2990                                          int *valp,
2991                                          int write, void *data)
2992 {
2993         if (write) {
2994                 if (*lvalp > INT_MAX / HZ)
2995                         return 1;
2996                 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2997         } else {
2998                 int val = *valp;
2999                 unsigned long lval;
3000                 if (val < 0) {
3001                         *negp = true;
3002                         lval = -(unsigned long)val;
3003                 } else {
3004                         *negp = false;
3005                         lval = (unsigned long)val;
3006                 }
3007                 *lvalp = lval / HZ;
3008         }
3009         return 0;
3010 }
3011 
3012 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
3013                                                 int *valp,
3014                                                 int write, void *data)
3015 {
3016         if (write) {
3017                 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
3018                         return 1;
3019                 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
3020         } else {
3021                 int val = *valp;
3022                 unsigned long lval;
3023                 if (val < 0) {
3024                         *negp = true;
3025                         lval = -(unsigned long)val;
3026                 } else {
3027                         *negp = false;
3028                         lval = (unsigned long)val;
3029                 }
3030                 *lvalp = jiffies_to_clock_t(lval);
3031         }
3032         return 0;
3033 }
3034 
3035 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
3036                                             int *valp,
3037                                             int write, void *data)
3038 {
3039         if (write) {
3040                 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
3041 
3042                 if (jif > INT_MAX)
3043                         return 1;
3044                 *valp = (int)jif;
3045         } else {
3046                 int val = *valp;
3047                 unsigned long lval;
3048                 if (val < 0) {
3049                         *negp = true;
3050                         lval = -(unsigned long)val;
3051                 } else {
3052                         *negp = false;
3053                         lval = (unsigned long)val;
3054                 }
3055                 *lvalp = jiffies_to_msecs(lval);
3056         }
3057         return 0;
3058 }
3059 
3060 /**
3061  * proc_dointvec_jiffies - read a vector of integers as seconds
3062  * @table: the sysctl table
3063  * @write: %TRUE if this is a write to the sysctl file
3064  * @buffer: the user buffer
3065  * @lenp: the size of the user buffer
3066  * @ppos: file position
3067  *
3068  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
3069  * values from/to the user buffer, treated as an ASCII string. 
3070  * The values read are assumed to be in seconds, and are converted into
3071  * jiffies.
3072  *
3073  * Returns 0 on success.
3074  */
3075 int proc_dointvec_jiffies(struct ctl_table *table, int write,
3076                           void __user *buffer, size_t *lenp, loff_t *ppos)
3077 {
3078     return do_proc_dointvec(table,write,buffer,lenp,ppos,
3079                             do_proc_dointvec_jiffies_conv,NULL);
3080 }
3081 
3082 /**
3083  * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
3084  * @table: the sysctl table
3085  * @write: %TRUE if this is a write to the sysctl file
3086  * @buffer: the user buffer
3087  * @lenp: the size of the user buffer
3088  * @ppos: pointer to the file position
3089  *
3090  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
3091  * values from/to the user buffer, treated as an ASCII string. 
3092  * The values read are assumed to be in 1/USER_HZ seconds, and 
3093  * are converted into jiffies.
3094  *
3095  * Returns 0 on success.
3096  */
3097 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
3098                                  void __user *buffer, size_t *lenp, loff_t *ppos)
3099 {
3100     return do_proc_dointvec(table,write,buffer,lenp,ppos,
3101                             do_proc_dointvec_userhz_jiffies_conv,NULL);
3102 }
3103 
3104 /**
3105  * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
3106  * @table: the sysctl table
3107  * @write: %TRUE if this is a write to the sysctl file
3108  * @buffer: the user buffer
3109  * @lenp: the size of the user buffer
3110  * @ppos: file position
3111  * @ppos: the current position in the file
3112  *
3113  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
3114  * values from/to the user buffer, treated as an ASCII string. 
3115  * The values read are assumed to be in 1/1000 seconds, and 
3116  * are converted into jiffies.
3117  *
3118  * Returns 0 on success.
3119  */
3120 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
3121                              void __user *buffer, size_t *lenp, loff_t *ppos)
3122 {
3123         return do_proc_dointvec(table, write, buffer, lenp, ppos,
3124                                 do_proc_dointvec_ms_jiffies_conv, NULL);
3125 }
3126 
3127 static int proc_do_cad_pid(struct ctl_table *table, int write,
3128                            void __user *buffer, size_t *lenp, loff_t *ppos)
3129 {
3130         struct pid *new_pid;
3131         pid_t tmp;
3132         int r;
3133 
3134         tmp = pid_vnr(cad_pid);
3135 
3136         r = __do_proc_dointvec(&tmp, table, write, buffer,
3137                                lenp, ppos, NULL, NULL);
3138         if (r || !write)
3139                 return r;
3140 
3141         new_pid = find_get_pid(tmp);
3142         if (!new_pid)
3143                 return -ESRCH;
3144 
3145         put_pid(xchg(&cad_pid, new_pid));
3146         return 0;
3147 }
3148 
3149 /**
3150  * proc_do_large_bitmap - read/write from/to a large bitmap
3151  * @table: the sysctl table
3152  * @write: %TRUE if this is a write to the sysctl file
3153  * @buffer: the user buffer
3154  * @lenp: the size of the user buffer
3155  * @ppos: file position
3156  *
3157  * The bitmap is stored at table->data and the bitmap length (in bits)
3158  * in table->maxlen.
3159  *
3160  * We use a range comma separated format (e.g. 1,3-4,10-10) so that
3161  * large bitmaps may be represented in a compact manner. Writing into
3162  * the file will clear the bitmap then update it with the given input.
3163  *
3164  * Returns 0 on success.
3165  */
3166 int proc_do_large_bitmap(struct ctl_table *table, int write,
3167                          void __user *buffer, size_t *lenp, loff_t *ppos)
3168 {
3169         int err = 0;
3170         bool first = 1;
3171         size_t left = *lenp;
3172         unsigned long bitmap_len = table->maxlen;
3173         unsigned long *bitmap = *(unsigned long **) table->data;
3174         unsigned long *tmp_bitmap = NULL;
3175         char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
3176 
3177         if (!bitmap || !bitmap_len || !left || (*ppos && !write)) {
3178                 *lenp = 0;
3179                 return 0;
3180         }
3181 
3182         if (write) {
3183                 char *kbuf, *p;
3184                 size_t skipped = 0;
3185 
3186                 if (left > PAGE_SIZE - 1) {
3187                         left = PAGE_SIZE - 1;
3188                         /* How much of the buffer we'll skip this pass */
3189                         skipped = *lenp - left;
3190                 }
3191 
3192                 p = kbuf = memdup_user_nul(buffer, left);
3193                 if (IS_ERR(kbuf))
3194                         return PTR_ERR(kbuf);
3195 
3196                 tmp_bitmap = bitmap_zalloc(bitmap_len, GFP_KERNEL);
3197                 if (!tmp_bitmap) {
3198                         kfree(kbuf);
3199                         return -ENOMEM;
3200                 }
3201                 proc_skip_char(&p, &left, '\n');
3202                 while (!err && left) {
3203                         unsigned long val_a, val_b;
3204                         bool neg;
3205                         size_t saved_left;
3206 
3207                         /* In case we stop parsing mid-number, we can reset */
3208                         saved_left = left;
3209                         err = proc_get_long(&p, &left, &val_a, &neg, tr_a,
3210                                              sizeof(tr_a), &c);
3211                         /*
3212                          * If we consumed the entirety of a truncated buffer or
3213                          * only one char is left (may be a "-"), then stop here,
3214                          * reset, & come back for more.
3215                          */
3216                         if ((left <= 1) && skipped) {
3217                                 left = saved_left;
3218                                 break;
3219                         }
3220 
3221                         if (err)
3222                                 break;
3223                         if (val_a >= bitmap_len || neg) {
3224                                 err = -EINVAL;
3225                                 break;
3226                         }
3227 
3228                         val_b = val_a;
3229                         if (left) {
3230                                 p++;
3231                                 left--;
3232                         }
3233 
3234                         if (c == '-') {
3235                                 err = proc_get_long(&p, &left, &val_b,
3236                                                      &neg, tr_b, sizeof(tr_b),
3237                                                      &c);
3238                                 /*
3239                                  * If we consumed all of a truncated buffer or
3240                                  * then stop here, reset, & come back for more.
3241                                  */
3242                                 if (!left && skipped) {
3243                                         left = saved_left;
3244                                         break;
3245                                 }
3246 
3247                                 if (err)
3248                                         break;
3249                                 if (val_b >= bitmap_len || neg ||
3250                                     val_a > val_b) {
3251                                         err = -EINVAL;
3252                                         break;
3253                                 }
3254                                 if (left) {
3255                                         p++;
3256                                         left--;
3257                                 }
3258                         }
3259 
3260                         bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
3261                         first = 0;
3262                         proc_skip_char(&p, &left, '\n');
3263                 }
3264                 kfree(kbuf);
3265                 left += skipped;
3266         } else {
3267                 unsigned long bit_a, bit_b = 0;
3268 
3269                 while (left) {
3270                         bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
3271                         if (bit_a >= bitmap_len)
3272                                 break;
3273                         bit_b = find_next_zero_bit(bitmap, bitmap_len,
3274                                                    bit_a + 1) - 1;
3275 
3276                         if (!first) {
3277                                 err = proc_put_char(&buffer, &left, ',');
3278                                 if (err)
3279                                         break;
3280                         }
3281                         err = proc_put_long(&buffer, &left, bit_a, false);
3282                         if (err)
3283                                 break;
3284                         if (bit_a != bit_b) {
3285                                 err = proc_put_char(&buffer, &left, '-');
3286                                 if (err)
3287                                         break;
3288                                 err = proc_put_long(&buffer, &left, bit_b, false);
3289                                 if (err)
3290                                         break;
3291                         }
3292 
3293                         first = 0; bit_b++;
3294                 }
3295                 if (!err)
3296                         err = proc_put_char(&buffer, &left, '\n');
3297         }
3298 
3299         if (!err) {
3300                 if (write) {
3301                         if (*ppos)
3302                                 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
3303                         else
3304                                 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
3305                 }
3306                 *lenp -= left;
3307                 *ppos += *lenp;
3308         }
3309 
3310         bitmap_free(tmp_bitmap);
3311         return err;
3312 }
3313 
3314 #else /* CONFIG_PROC_SYSCTL */
3315 
3316 int proc_dostring(struct ctl_table *table, int write,
3317                   void __user *buffer, size_t *lenp, loff_t *ppos)
3318 {
3319         return -ENOSYS;
3320 }
3321 
3322 int proc_dointvec(struct ctl_table *table, int write,
3323                   void __user *buffer, size_t *lenp, loff_t *ppos)
3324 {
3325         return -ENOSYS;
3326 }
3327 
3328 int proc_douintvec(struct ctl_table *table, int write,
3329                   void __user *buffer, size_t *lenp, loff_t *ppos)
3330 {
3331         return -ENOSYS;
3332 }
3333 
3334 int proc_dointvec_minmax(struct ctl_table *table, int write,
3335                     void __user *buffer, size_t *lenp, loff_t *ppos)
3336 {
3337         return -ENOSYS;
3338 }
3339 
3340 int proc_douintvec_minmax(struct ctl_table *table, int write,
3341                           void __user *buffer, size_t *lenp, loff_t *ppos)
3342 {
3343         return -ENOSYS;
3344 }
3345 
3346 int proc_dointvec_jiffies(struct ctl_table *table, int write,
3347                     void __user *buffer, size_t *lenp, loff_t *ppos)
3348 {
3349         return -ENOSYS;
3350 }
3351 
3352 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
3353                     void __user *buffer, size_t *lenp, loff_t *ppos)
3354 {
3355         return -ENOSYS;
3356 }
3357 
3358 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
3359                              void __user *buffer, size_t *lenp, loff_t *ppos)
3360 {
3361         return -ENOSYS;
3362 }
3363 
3364 int proc_doulongvec_minmax(struct ctl_table *table, int write,
3365                     void __user *buffer, size_t *lenp, loff_t *ppos)
3366 {
3367         return -ENOSYS;
3368 }
3369 
3370 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
3371                                       void __user *buffer,
3372                                       size_t *lenp, loff_t *ppos)
3373 {
3374     return -ENOSYS;
3375 }
3376 
3377 int proc_do_large_bitmap(struct ctl_table *table, int write,
3378                          void __user *buffer, size_t *lenp, loff_t *ppos)
3379 {
3380         return -ENOSYS;
3381 }
3382 
3383 #endif /* CONFIG_PROC_SYSCTL */
3384 
3385 #if defined(CONFIG_SYSCTL)
3386 int proc_do_static_key(struct ctl_table *table, int write,
3387                        void __user *buffer, size_t *lenp,
3388                        loff_t *ppos)
3389 {
3390         struct static_key *key = (struct static_key *)table->data;
3391         static DEFINE_MUTEX(static_key_mutex);
3392         int val, ret;
3393         struct ctl_table tmp = {
3394                 .data   = &val,
3395                 .maxlen = sizeof(val),
3396                 .mode   = table->mode,
3397                 .extra1 = SYSCTL_ZERO,
3398                 .extra2 = SYSCTL_ONE,
3399         };
3400 
3401         if (write && !capable(CAP_SYS_ADMIN))
3402                 return -EPERM;
3403 
3404         mutex_lock(&static_key_mutex);
3405         val = static_key_enabled(key);
3406         ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
3407         if (write && !ret) {
3408                 if (val)
3409                         static_key_enable(key);
3410                 else
3411                         static_key_disable(key);
3412         }
3413         mutex_unlock(&static_key_mutex);
3414         return ret;
3415 }
3416 #endif
3417 /*
3418  * No sense putting this after each symbol definition, twice,
3419  * exception granted :-)
3420  */
3421 EXPORT_SYMBOL(proc_dointvec);
3422 EXPORT_SYMBOL(proc_douintvec);
3423 EXPORT_SYMBOL(proc_dointvec_jiffies);
3424 EXPORT_SYMBOL(proc_dointvec_minmax);
3425 EXPORT_SYMBOL_GPL(proc_douintvec_minmax);
3426 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
3427 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
3428 EXPORT_SYMBOL(proc_dostring);
3429 EXPORT_SYMBOL(proc_doulongvec_minmax);
3430 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
3431 EXPORT_SYMBOL(proc_do_large_bitmap);
3432 

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