Merge tag 'renesas-dt-fixes-for-v4.15' of https://git.kernel.org/pub/scm/linux/kernel...
[sfrench/cifs-2.6.git] / kernel / sysctl.c
1 /*
2  * sysctl.c: General linux system control interface
3  *
4  * Begun 24 March 1995, Stephen Tweedie
5  * Added /proc support, Dec 1995
6  * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
7  * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
8  * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
9  * Dynamic registration fixes, Stephen Tweedie.
10  * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
11  * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
12  *  Horn.
13  * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
14  * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
15  * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
16  *  Wendling.
17  * The list_for_each() macro wasn't appropriate for the sysctl loop.
18  *  Removed it and replaced it with older style, 03/23/00, Bill Wendling
19  */
20
21 #include <linux/module.h>
22 #include <linux/aio.h>
23 #include <linux/mm.h>
24 #include <linux/swap.h>
25 #include <linux/slab.h>
26 #include <linux/sysctl.h>
27 #include <linux/bitmap.h>
28 #include <linux/signal.h>
29 #include <linux/printk.h>
30 #include <linux/proc_fs.h>
31 #include <linux/security.h>
32 #include <linux/ctype.h>
33 #include <linux/kmemleak.h>
34 #include <linux/fs.h>
35 #include <linux/init.h>
36 #include <linux/kernel.h>
37 #include <linux/kobject.h>
38 #include <linux/net.h>
39 #include <linux/sysrq.h>
40 #include <linux/highuid.h>
41 #include <linux/writeback.h>
42 #include <linux/ratelimit.h>
43 #include <linux/compaction.h>
44 #include <linux/hugetlb.h>
45 #include <linux/initrd.h>
46 #include <linux/key.h>
47 #include <linux/times.h>
48 #include <linux/limits.h>
49 #include <linux/dcache.h>
50 #include <linux/dnotify.h>
51 #include <linux/syscalls.h>
52 #include <linux/vmstat.h>
53 #include <linux/nfs_fs.h>
54 #include <linux/acpi.h>
55 #include <linux/reboot.h>
56 #include <linux/ftrace.h>
57 #include <linux/perf_event.h>
58 #include <linux/kprobes.h>
59 #include <linux/pipe_fs_i.h>
60 #include <linux/oom.h>
61 #include <linux/kmod.h>
62 #include <linux/capability.h>
63 #include <linux/binfmts.h>
64 #include <linux/sched/sysctl.h>
65 #include <linux/sched/coredump.h>
66 #include <linux/kexec.h>
67 #include <linux/bpf.h>
68 #include <linux/mount.h>
69 #include <linux/pipe_fs_i.h>
70
71 #include <linux/uaccess.h>
72 #include <asm/processor.h>
73
74 #ifdef CONFIG_X86
75 #include <asm/nmi.h>
76 #include <asm/stacktrace.h>
77 #include <asm/io.h>
78 #endif
79 #ifdef CONFIG_SPARC
80 #include <asm/setup.h>
81 #endif
82 #ifdef CONFIG_BSD_PROCESS_ACCT
83 #include <linux/acct.h>
84 #endif
85 #ifdef CONFIG_RT_MUTEXES
86 #include <linux/rtmutex.h>
87 #endif
88 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
89 #include <linux/lockdep.h>
90 #endif
91 #ifdef CONFIG_CHR_DEV_SG
92 #include <scsi/sg.h>
93 #endif
94
95 #ifdef CONFIG_LOCKUP_DETECTOR
96 #include <linux/nmi.h>
97 #endif
98
99 #if defined(CONFIG_SYSCTL)
100
101 /* External variables not in a header file. */
102 extern int suid_dumpable;
103 #ifdef CONFIG_COREDUMP
104 extern int core_uses_pid;
105 extern char core_pattern[];
106 extern unsigned int core_pipe_limit;
107 #endif
108 extern int pid_max;
109 extern int pid_max_min, pid_max_max;
110 extern int percpu_pagelist_fraction;
111 extern int latencytop_enabled;
112 extern unsigned int sysctl_nr_open_min, sysctl_nr_open_max;
113 #ifndef CONFIG_MMU
114 extern int sysctl_nr_trim_pages;
115 #endif
116
117 /* Constants used for minimum and  maximum */
118 #ifdef CONFIG_LOCKUP_DETECTOR
119 static int sixty = 60;
120 #endif
121
122 static int __maybe_unused neg_one = -1;
123
124 static int zero;
125 static int __maybe_unused one = 1;
126 static int __maybe_unused two = 2;
127 static int __maybe_unused four = 4;
128 static unsigned long one_ul = 1;
129 static int one_hundred = 100;
130 static int one_thousand = 1000;
131 #ifdef CONFIG_PRINTK
132 static int ten_thousand = 10000;
133 #endif
134 #ifdef CONFIG_PERF_EVENTS
135 static int six_hundred_forty_kb = 640 * 1024;
136 #endif
137
138 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
139 static unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
140
141 /* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
142 static int maxolduid = 65535;
143 static int minolduid;
144
145 static int ngroups_max = NGROUPS_MAX;
146 static const int cap_last_cap = CAP_LAST_CAP;
147
148 /*this is needed for proc_doulongvec_minmax of sysctl_hung_task_timeout_secs */
149 #ifdef CONFIG_DETECT_HUNG_TASK
150 static unsigned long hung_task_timeout_max = (LONG_MAX/HZ);
151 #endif
152
153 #ifdef CONFIG_INOTIFY_USER
154 #include <linux/inotify.h>
155 #endif
156 #ifdef CONFIG_SPARC
157 #endif
158
159 #ifdef __hppa__
160 extern int pwrsw_enabled;
161 #endif
162
163 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
164 extern int unaligned_enabled;
165 #endif
166
167 #ifdef CONFIG_IA64
168 extern int unaligned_dump_stack;
169 #endif
170
171 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
172 extern int no_unaligned_warning;
173 #endif
174
175 #ifdef CONFIG_PROC_SYSCTL
176
177 /**
178  * enum sysctl_writes_mode - supported sysctl write modes
179  *
180  * @SYSCTL_WRITES_LEGACY: each write syscall must fully contain the sysctl value
181  *      to be written, and multiple writes on the same sysctl file descriptor
182  *      will rewrite the sysctl value, regardless of file position. No warning
183  *      is issued when the initial position is not 0.
184  * @SYSCTL_WRITES_WARN: same as above but warn when the initial file position is
185  *      not 0.
186  * @SYSCTL_WRITES_STRICT: writes to numeric sysctl entries must always be at
187  *      file position 0 and the value must be fully contained in the buffer
188  *      sent to the write syscall. If dealing with strings respect the file
189  *      position, but restrict this to the max length of the buffer, anything
190  *      passed the max lenght will be ignored. Multiple writes will append
191  *      to the buffer.
192  *
193  * These write modes control how current file position affects the behavior of
194  * updating sysctl values through the proc interface on each write.
195  */
196 enum sysctl_writes_mode {
197         SYSCTL_WRITES_LEGACY            = -1,
198         SYSCTL_WRITES_WARN              = 0,
199         SYSCTL_WRITES_STRICT            = 1,
200 };
201
202 static enum sysctl_writes_mode sysctl_writes_strict = SYSCTL_WRITES_STRICT;
203
204 static int proc_do_cad_pid(struct ctl_table *table, int write,
205                   void __user *buffer, size_t *lenp, loff_t *ppos);
206 static int proc_taint(struct ctl_table *table, int write,
207                                void __user *buffer, size_t *lenp, loff_t *ppos);
208 #endif
209
210 #ifdef CONFIG_PRINTK
211 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
212                                 void __user *buffer, size_t *lenp, loff_t *ppos);
213 #endif
214
215 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
216                 void __user *buffer, size_t *lenp, loff_t *ppos);
217 #ifdef CONFIG_COREDUMP
218 static int proc_dostring_coredump(struct ctl_table *table, int write,
219                 void __user *buffer, size_t *lenp, loff_t *ppos);
220 #endif
221
222 #ifdef CONFIG_MAGIC_SYSRQ
223 /* Note: sysrq code uses it's own private copy */
224 static int __sysrq_enabled = CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE;
225
226 static int sysrq_sysctl_handler(struct ctl_table *table, int write,
227                                 void __user *buffer, size_t *lenp,
228                                 loff_t *ppos)
229 {
230         int error;
231
232         error = proc_dointvec(table, write, buffer, lenp, ppos);
233         if (error)
234                 return error;
235
236         if (write)
237                 sysrq_toggle_support(__sysrq_enabled);
238
239         return 0;
240 }
241
242 #endif
243
244 static struct ctl_table kern_table[];
245 static struct ctl_table vm_table[];
246 static struct ctl_table fs_table[];
247 static struct ctl_table debug_table[];
248 static struct ctl_table dev_table[];
249 extern struct ctl_table random_table[];
250 #ifdef CONFIG_EPOLL
251 extern struct ctl_table epoll_table[];
252 #endif
253
254 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
255 int sysctl_legacy_va_layout;
256 #endif
257
258 /* The default sysctl tables: */
259
260 static struct ctl_table sysctl_base_table[] = {
261         {
262                 .procname       = "kernel",
263                 .mode           = 0555,
264                 .child          = kern_table,
265         },
266         {
267                 .procname       = "vm",
268                 .mode           = 0555,
269                 .child          = vm_table,
270         },
271         {
272                 .procname       = "fs",
273                 .mode           = 0555,
274                 .child          = fs_table,
275         },
276         {
277                 .procname       = "debug",
278                 .mode           = 0555,
279                 .child          = debug_table,
280         },
281         {
282                 .procname       = "dev",
283                 .mode           = 0555,
284                 .child          = dev_table,
285         },
286         { }
287 };
288
289 #ifdef CONFIG_SCHED_DEBUG
290 static int min_sched_granularity_ns = 100000;           /* 100 usecs */
291 static int max_sched_granularity_ns = NSEC_PER_SEC;     /* 1 second */
292 static int min_wakeup_granularity_ns;                   /* 0 usecs */
293 static int max_wakeup_granularity_ns = NSEC_PER_SEC;    /* 1 second */
294 #ifdef CONFIG_SMP
295 static int min_sched_tunable_scaling = SCHED_TUNABLESCALING_NONE;
296 static int max_sched_tunable_scaling = SCHED_TUNABLESCALING_END-1;
297 #endif /* CONFIG_SMP */
298 #endif /* CONFIG_SCHED_DEBUG */
299
300 #ifdef CONFIG_COMPACTION
301 static int min_extfrag_threshold;
302 static int max_extfrag_threshold = 1000;
303 #endif
304
305 static struct ctl_table kern_table[] = {
306         {
307                 .procname       = "sched_child_runs_first",
308                 .data           = &sysctl_sched_child_runs_first,
309                 .maxlen         = sizeof(unsigned int),
310                 .mode           = 0644,
311                 .proc_handler   = proc_dointvec,
312         },
313 #ifdef CONFIG_SCHED_DEBUG
314         {
315                 .procname       = "sched_min_granularity_ns",
316                 .data           = &sysctl_sched_min_granularity,
317                 .maxlen         = sizeof(unsigned int),
318                 .mode           = 0644,
319                 .proc_handler   = sched_proc_update_handler,
320                 .extra1         = &min_sched_granularity_ns,
321                 .extra2         = &max_sched_granularity_ns,
322         },
323         {
324                 .procname       = "sched_latency_ns",
325                 .data           = &sysctl_sched_latency,
326                 .maxlen         = sizeof(unsigned int),
327                 .mode           = 0644,
328                 .proc_handler   = sched_proc_update_handler,
329                 .extra1         = &min_sched_granularity_ns,
330                 .extra2         = &max_sched_granularity_ns,
331         },
332         {
333                 .procname       = "sched_wakeup_granularity_ns",
334                 .data           = &sysctl_sched_wakeup_granularity,
335                 .maxlen         = sizeof(unsigned int),
336                 .mode           = 0644,
337                 .proc_handler   = sched_proc_update_handler,
338                 .extra1         = &min_wakeup_granularity_ns,
339                 .extra2         = &max_wakeup_granularity_ns,
340         },
341 #ifdef CONFIG_SMP
342         {
343                 .procname       = "sched_tunable_scaling",
344                 .data           = &sysctl_sched_tunable_scaling,
345                 .maxlen         = sizeof(enum sched_tunable_scaling),
346                 .mode           = 0644,
347                 .proc_handler   = sched_proc_update_handler,
348                 .extra1         = &min_sched_tunable_scaling,
349                 .extra2         = &max_sched_tunable_scaling,
350         },
351         {
352                 .procname       = "sched_migration_cost_ns",
353                 .data           = &sysctl_sched_migration_cost,
354                 .maxlen         = sizeof(unsigned int),
355                 .mode           = 0644,
356                 .proc_handler   = proc_dointvec,
357         },
358         {
359                 .procname       = "sched_nr_migrate",
360                 .data           = &sysctl_sched_nr_migrate,
361                 .maxlen         = sizeof(unsigned int),
362                 .mode           = 0644,
363                 .proc_handler   = proc_dointvec,
364         },
365         {
366                 .procname       = "sched_time_avg_ms",
367                 .data           = &sysctl_sched_time_avg,
368                 .maxlen         = sizeof(unsigned int),
369                 .mode           = 0644,
370                 .proc_handler   = proc_dointvec_minmax,
371                 .extra1         = &one,
372         },
373 #ifdef CONFIG_SCHEDSTATS
374         {
375                 .procname       = "sched_schedstats",
376                 .data           = NULL,
377                 .maxlen         = sizeof(unsigned int),
378                 .mode           = 0644,
379                 .proc_handler   = sysctl_schedstats,
380                 .extra1         = &zero,
381                 .extra2         = &one,
382         },
383 #endif /* CONFIG_SCHEDSTATS */
384 #endif /* CONFIG_SMP */
385 #ifdef CONFIG_NUMA_BALANCING
386         {
387                 .procname       = "numa_balancing_scan_delay_ms",
388                 .data           = &sysctl_numa_balancing_scan_delay,
389                 .maxlen         = sizeof(unsigned int),
390                 .mode           = 0644,
391                 .proc_handler   = proc_dointvec,
392         },
393         {
394                 .procname       = "numa_balancing_scan_period_min_ms",
395                 .data           = &sysctl_numa_balancing_scan_period_min,
396                 .maxlen         = sizeof(unsigned int),
397                 .mode           = 0644,
398                 .proc_handler   = proc_dointvec,
399         },
400         {
401                 .procname       = "numa_balancing_scan_period_max_ms",
402                 .data           = &sysctl_numa_balancing_scan_period_max,
403                 .maxlen         = sizeof(unsigned int),
404                 .mode           = 0644,
405                 .proc_handler   = proc_dointvec,
406         },
407         {
408                 .procname       = "numa_balancing_scan_size_mb",
409                 .data           = &sysctl_numa_balancing_scan_size,
410                 .maxlen         = sizeof(unsigned int),
411                 .mode           = 0644,
412                 .proc_handler   = proc_dointvec_minmax,
413                 .extra1         = &one,
414         },
415         {
416                 .procname       = "numa_balancing",
417                 .data           = NULL, /* filled in by handler */
418                 .maxlen         = sizeof(unsigned int),
419                 .mode           = 0644,
420                 .proc_handler   = sysctl_numa_balancing,
421                 .extra1         = &zero,
422                 .extra2         = &one,
423         },
424 #endif /* CONFIG_NUMA_BALANCING */
425 #endif /* CONFIG_SCHED_DEBUG */
426         {
427                 .procname       = "sched_rt_period_us",
428                 .data           = &sysctl_sched_rt_period,
429                 .maxlen         = sizeof(unsigned int),
430                 .mode           = 0644,
431                 .proc_handler   = sched_rt_handler,
432         },
433         {
434                 .procname       = "sched_rt_runtime_us",
435                 .data           = &sysctl_sched_rt_runtime,
436                 .maxlen         = sizeof(int),
437                 .mode           = 0644,
438                 .proc_handler   = sched_rt_handler,
439         },
440         {
441                 .procname       = "sched_rr_timeslice_ms",
442                 .data           = &sysctl_sched_rr_timeslice,
443                 .maxlen         = sizeof(int),
444                 .mode           = 0644,
445                 .proc_handler   = sched_rr_handler,
446         },
447 #ifdef CONFIG_SCHED_AUTOGROUP
448         {
449                 .procname       = "sched_autogroup_enabled",
450                 .data           = &sysctl_sched_autogroup_enabled,
451                 .maxlen         = sizeof(unsigned int),
452                 .mode           = 0644,
453                 .proc_handler   = proc_dointvec_minmax,
454                 .extra1         = &zero,
455                 .extra2         = &one,
456         },
457 #endif
458 #ifdef CONFIG_CFS_BANDWIDTH
459         {
460                 .procname       = "sched_cfs_bandwidth_slice_us",
461                 .data           = &sysctl_sched_cfs_bandwidth_slice,
462                 .maxlen         = sizeof(unsigned int),
463                 .mode           = 0644,
464                 .proc_handler   = proc_dointvec_minmax,
465                 .extra1         = &one,
466         },
467 #endif
468 #ifdef CONFIG_PROVE_LOCKING
469         {
470                 .procname       = "prove_locking",
471                 .data           = &prove_locking,
472                 .maxlen         = sizeof(int),
473                 .mode           = 0644,
474                 .proc_handler   = proc_dointvec,
475         },
476 #endif
477 #ifdef CONFIG_LOCK_STAT
478         {
479                 .procname       = "lock_stat",
480                 .data           = &lock_stat,
481                 .maxlen         = sizeof(int),
482                 .mode           = 0644,
483                 .proc_handler   = proc_dointvec,
484         },
485 #endif
486         {
487                 .procname       = "panic",
488                 .data           = &panic_timeout,
489                 .maxlen         = sizeof(int),
490                 .mode           = 0644,
491                 .proc_handler   = proc_dointvec,
492         },
493 #ifdef CONFIG_COREDUMP
494         {
495                 .procname       = "core_uses_pid",
496                 .data           = &core_uses_pid,
497                 .maxlen         = sizeof(int),
498                 .mode           = 0644,
499                 .proc_handler   = proc_dointvec,
500         },
501         {
502                 .procname       = "core_pattern",
503                 .data           = core_pattern,
504                 .maxlen         = CORENAME_MAX_SIZE,
505                 .mode           = 0644,
506                 .proc_handler   = proc_dostring_coredump,
507         },
508         {
509                 .procname       = "core_pipe_limit",
510                 .data           = &core_pipe_limit,
511                 .maxlen         = sizeof(unsigned int),
512                 .mode           = 0644,
513                 .proc_handler   = proc_dointvec,
514         },
515 #endif
516 #ifdef CONFIG_PROC_SYSCTL
517         {
518                 .procname       = "tainted",
519                 .maxlen         = sizeof(long),
520                 .mode           = 0644,
521                 .proc_handler   = proc_taint,
522         },
523         {
524                 .procname       = "sysctl_writes_strict",
525                 .data           = &sysctl_writes_strict,
526                 .maxlen         = sizeof(int),
527                 .mode           = 0644,
528                 .proc_handler   = proc_dointvec_minmax,
529                 .extra1         = &neg_one,
530                 .extra2         = &one,
531         },
532 #endif
533 #ifdef CONFIG_LATENCYTOP
534         {
535                 .procname       = "latencytop",
536                 .data           = &latencytop_enabled,
537                 .maxlen         = sizeof(int),
538                 .mode           = 0644,
539                 .proc_handler   = sysctl_latencytop,
540         },
541 #endif
542 #ifdef CONFIG_BLK_DEV_INITRD
543         {
544                 .procname       = "real-root-dev",
545                 .data           = &real_root_dev,
546                 .maxlen         = sizeof(int),
547                 .mode           = 0644,
548                 .proc_handler   = proc_dointvec,
549         },
550 #endif
551         {
552                 .procname       = "print-fatal-signals",
553                 .data           = &print_fatal_signals,
554                 .maxlen         = sizeof(int),
555                 .mode           = 0644,
556                 .proc_handler   = proc_dointvec,
557         },
558 #ifdef CONFIG_SPARC
559         {
560                 .procname       = "reboot-cmd",
561                 .data           = reboot_command,
562                 .maxlen         = 256,
563                 .mode           = 0644,
564                 .proc_handler   = proc_dostring,
565         },
566         {
567                 .procname       = "stop-a",
568                 .data           = &stop_a_enabled,
569                 .maxlen         = sizeof (int),
570                 .mode           = 0644,
571                 .proc_handler   = proc_dointvec,
572         },
573         {
574                 .procname       = "scons-poweroff",
575                 .data           = &scons_pwroff,
576                 .maxlen         = sizeof (int),
577                 .mode           = 0644,
578                 .proc_handler   = proc_dointvec,
579         },
580 #endif
581 #ifdef CONFIG_SPARC64
582         {
583                 .procname       = "tsb-ratio",
584                 .data           = &sysctl_tsb_ratio,
585                 .maxlen         = sizeof (int),
586                 .mode           = 0644,
587                 .proc_handler   = proc_dointvec,
588         },
589 #endif
590 #ifdef __hppa__
591         {
592                 .procname       = "soft-power",
593                 .data           = &pwrsw_enabled,
594                 .maxlen         = sizeof (int),
595                 .mode           = 0644,
596                 .proc_handler   = proc_dointvec,
597         },
598 #endif
599 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
600         {
601                 .procname       = "unaligned-trap",
602                 .data           = &unaligned_enabled,
603                 .maxlen         = sizeof (int),
604                 .mode           = 0644,
605                 .proc_handler   = proc_dointvec,
606         },
607 #endif
608         {
609                 .procname       = "ctrl-alt-del",
610                 .data           = &C_A_D,
611                 .maxlen         = sizeof(int),
612                 .mode           = 0644,
613                 .proc_handler   = proc_dointvec,
614         },
615 #ifdef CONFIG_FUNCTION_TRACER
616         {
617                 .procname       = "ftrace_enabled",
618                 .data           = &ftrace_enabled,
619                 .maxlen         = sizeof(int),
620                 .mode           = 0644,
621                 .proc_handler   = ftrace_enable_sysctl,
622         },
623 #endif
624 #ifdef CONFIG_STACK_TRACER
625         {
626                 .procname       = "stack_tracer_enabled",
627                 .data           = &stack_tracer_enabled,
628                 .maxlen         = sizeof(int),
629                 .mode           = 0644,
630                 .proc_handler   = stack_trace_sysctl,
631         },
632 #endif
633 #ifdef CONFIG_TRACING
634         {
635                 .procname       = "ftrace_dump_on_oops",
636                 .data           = &ftrace_dump_on_oops,
637                 .maxlen         = sizeof(int),
638                 .mode           = 0644,
639                 .proc_handler   = proc_dointvec,
640         },
641         {
642                 .procname       = "traceoff_on_warning",
643                 .data           = &__disable_trace_on_warning,
644                 .maxlen         = sizeof(__disable_trace_on_warning),
645                 .mode           = 0644,
646                 .proc_handler   = proc_dointvec,
647         },
648         {
649                 .procname       = "tracepoint_printk",
650                 .data           = &tracepoint_printk,
651                 .maxlen         = sizeof(tracepoint_printk),
652                 .mode           = 0644,
653                 .proc_handler   = tracepoint_printk_sysctl,
654         },
655 #endif
656 #ifdef CONFIG_KEXEC_CORE
657         {
658                 .procname       = "kexec_load_disabled",
659                 .data           = &kexec_load_disabled,
660                 .maxlen         = sizeof(int),
661                 .mode           = 0644,
662                 /* only handle a transition from default "0" to "1" */
663                 .proc_handler   = proc_dointvec_minmax,
664                 .extra1         = &one,
665                 .extra2         = &one,
666         },
667 #endif
668 #ifdef CONFIG_MODULES
669         {
670                 .procname       = "modprobe",
671                 .data           = &modprobe_path,
672                 .maxlen         = KMOD_PATH_LEN,
673                 .mode           = 0644,
674                 .proc_handler   = proc_dostring,
675         },
676         {
677                 .procname       = "modules_disabled",
678                 .data           = &modules_disabled,
679                 .maxlen         = sizeof(int),
680                 .mode           = 0644,
681                 /* only handle a transition from default "0" to "1" */
682                 .proc_handler   = proc_dointvec_minmax,
683                 .extra1         = &one,
684                 .extra2         = &one,
685         },
686 #endif
687 #ifdef CONFIG_UEVENT_HELPER
688         {
689                 .procname       = "hotplug",
690                 .data           = &uevent_helper,
691                 .maxlen         = UEVENT_HELPER_PATH_LEN,
692                 .mode           = 0644,
693                 .proc_handler   = proc_dostring,
694         },
695 #endif
696 #ifdef CONFIG_CHR_DEV_SG
697         {
698                 .procname       = "sg-big-buff",
699                 .data           = &sg_big_buff,
700                 .maxlen         = sizeof (int),
701                 .mode           = 0444,
702                 .proc_handler   = proc_dointvec,
703         },
704 #endif
705 #ifdef CONFIG_BSD_PROCESS_ACCT
706         {
707                 .procname       = "acct",
708                 .data           = &acct_parm,
709                 .maxlen         = 3*sizeof(int),
710                 .mode           = 0644,
711                 .proc_handler   = proc_dointvec,
712         },
713 #endif
714 #ifdef CONFIG_MAGIC_SYSRQ
715         {
716                 .procname       = "sysrq",
717                 .data           = &__sysrq_enabled,
718                 .maxlen         = sizeof (int),
719                 .mode           = 0644,
720                 .proc_handler   = sysrq_sysctl_handler,
721         },
722 #endif
723 #ifdef CONFIG_PROC_SYSCTL
724         {
725                 .procname       = "cad_pid",
726                 .data           = NULL,
727                 .maxlen         = sizeof (int),
728                 .mode           = 0600,
729                 .proc_handler   = proc_do_cad_pid,
730         },
731 #endif
732         {
733                 .procname       = "threads-max",
734                 .data           = NULL,
735                 .maxlen         = sizeof(int),
736                 .mode           = 0644,
737                 .proc_handler   = sysctl_max_threads,
738         },
739         {
740                 .procname       = "random",
741                 .mode           = 0555,
742                 .child          = random_table,
743         },
744         {
745                 .procname       = "usermodehelper",
746                 .mode           = 0555,
747                 .child          = usermodehelper_table,
748         },
749         {
750                 .procname       = "overflowuid",
751                 .data           = &overflowuid,
752                 .maxlen         = sizeof(int),
753                 .mode           = 0644,
754                 .proc_handler   = proc_dointvec_minmax,
755                 .extra1         = &minolduid,
756                 .extra2         = &maxolduid,
757         },
758         {
759                 .procname       = "overflowgid",
760                 .data           = &overflowgid,
761                 .maxlen         = sizeof(int),
762                 .mode           = 0644,
763                 .proc_handler   = proc_dointvec_minmax,
764                 .extra1         = &minolduid,
765                 .extra2         = &maxolduid,
766         },
767 #ifdef CONFIG_S390
768 #ifdef CONFIG_MATHEMU
769         {
770                 .procname       = "ieee_emulation_warnings",
771                 .data           = &sysctl_ieee_emulation_warnings,
772                 .maxlen         = sizeof(int),
773                 .mode           = 0644,
774                 .proc_handler   = proc_dointvec,
775         },
776 #endif
777         {
778                 .procname       = "userprocess_debug",
779                 .data           = &show_unhandled_signals,
780                 .maxlen         = sizeof(int),
781                 .mode           = 0644,
782                 .proc_handler   = proc_dointvec,
783         },
784 #endif
785         {
786                 .procname       = "pid_max",
787                 .data           = &pid_max,
788                 .maxlen         = sizeof (int),
789                 .mode           = 0644,
790                 .proc_handler   = proc_dointvec_minmax,
791                 .extra1         = &pid_max_min,
792                 .extra2         = &pid_max_max,
793         },
794         {
795                 .procname       = "panic_on_oops",
796                 .data           = &panic_on_oops,
797                 .maxlen         = sizeof(int),
798                 .mode           = 0644,
799                 .proc_handler   = proc_dointvec,
800         },
801 #if defined CONFIG_PRINTK
802         {
803                 .procname       = "printk",
804                 .data           = &console_loglevel,
805                 .maxlen         = 4*sizeof(int),
806                 .mode           = 0644,
807                 .proc_handler   = proc_dointvec,
808         },
809         {
810                 .procname       = "printk_ratelimit",
811                 .data           = &printk_ratelimit_state.interval,
812                 .maxlen         = sizeof(int),
813                 .mode           = 0644,
814                 .proc_handler   = proc_dointvec_jiffies,
815         },
816         {
817                 .procname       = "printk_ratelimit_burst",
818                 .data           = &printk_ratelimit_state.burst,
819                 .maxlen         = sizeof(int),
820                 .mode           = 0644,
821                 .proc_handler   = proc_dointvec,
822         },
823         {
824                 .procname       = "printk_delay",
825                 .data           = &printk_delay_msec,
826                 .maxlen         = sizeof(int),
827                 .mode           = 0644,
828                 .proc_handler   = proc_dointvec_minmax,
829                 .extra1         = &zero,
830                 .extra2         = &ten_thousand,
831         },
832         {
833                 .procname       = "printk_devkmsg",
834                 .data           = devkmsg_log_str,
835                 .maxlen         = DEVKMSG_STR_MAX_SIZE,
836                 .mode           = 0644,
837                 .proc_handler   = devkmsg_sysctl_set_loglvl,
838         },
839         {
840                 .procname       = "dmesg_restrict",
841                 .data           = &dmesg_restrict,
842                 .maxlen         = sizeof(int),
843                 .mode           = 0644,
844                 .proc_handler   = proc_dointvec_minmax_sysadmin,
845                 .extra1         = &zero,
846                 .extra2         = &one,
847         },
848         {
849                 .procname       = "kptr_restrict",
850                 .data           = &kptr_restrict,
851                 .maxlen         = sizeof(int),
852                 .mode           = 0644,
853                 .proc_handler   = proc_dointvec_minmax_sysadmin,
854                 .extra1         = &zero,
855                 .extra2         = &two,
856         },
857 #endif
858         {
859                 .procname       = "ngroups_max",
860                 .data           = &ngroups_max,
861                 .maxlen         = sizeof (int),
862                 .mode           = 0444,
863                 .proc_handler   = proc_dointvec,
864         },
865         {
866                 .procname       = "cap_last_cap",
867                 .data           = (void *)&cap_last_cap,
868                 .maxlen         = sizeof(int),
869                 .mode           = 0444,
870                 .proc_handler   = proc_dointvec,
871         },
872 #if defined(CONFIG_LOCKUP_DETECTOR)
873         {
874                 .procname       = "watchdog",
875                 .data           = &watchdog_user_enabled,
876                 .maxlen         = sizeof(int),
877                 .mode           = 0644,
878                 .proc_handler   = proc_watchdog,
879                 .extra1         = &zero,
880                 .extra2         = &one,
881         },
882         {
883                 .procname       = "watchdog_thresh",
884                 .data           = &watchdog_thresh,
885                 .maxlen         = sizeof(int),
886                 .mode           = 0644,
887                 .proc_handler   = proc_watchdog_thresh,
888                 .extra1         = &zero,
889                 .extra2         = &sixty,
890         },
891         {
892                 .procname       = "nmi_watchdog",
893                 .data           = &nmi_watchdog_user_enabled,
894                 .maxlen         = sizeof(int),
895                 .mode           = NMI_WATCHDOG_SYSCTL_PERM,
896                 .proc_handler   = proc_nmi_watchdog,
897                 .extra1         = &zero,
898                 .extra2         = &one,
899         },
900         {
901                 .procname       = "watchdog_cpumask",
902                 .data           = &watchdog_cpumask_bits,
903                 .maxlen         = NR_CPUS,
904                 .mode           = 0644,
905                 .proc_handler   = proc_watchdog_cpumask,
906         },
907 #ifdef CONFIG_SOFTLOCKUP_DETECTOR
908         {
909                 .procname       = "soft_watchdog",
910                 .data           = &soft_watchdog_user_enabled,
911                 .maxlen         = sizeof(int),
912                 .mode           = 0644,
913                 .proc_handler   = proc_soft_watchdog,
914                 .extra1         = &zero,
915                 .extra2         = &one,
916         },
917         {
918                 .procname       = "softlockup_panic",
919                 .data           = &softlockup_panic,
920                 .maxlen         = sizeof(int),
921                 .mode           = 0644,
922                 .proc_handler   = proc_dointvec_minmax,
923                 .extra1         = &zero,
924                 .extra2         = &one,
925         },
926 #ifdef CONFIG_SMP
927         {
928                 .procname       = "softlockup_all_cpu_backtrace",
929                 .data           = &sysctl_softlockup_all_cpu_backtrace,
930                 .maxlen         = sizeof(int),
931                 .mode           = 0644,
932                 .proc_handler   = proc_dointvec_minmax,
933                 .extra1         = &zero,
934                 .extra2         = &one,
935         },
936 #endif /* CONFIG_SMP */
937 #endif
938 #ifdef CONFIG_HARDLOCKUP_DETECTOR
939         {
940                 .procname       = "hardlockup_panic",
941                 .data           = &hardlockup_panic,
942                 .maxlen         = sizeof(int),
943                 .mode           = 0644,
944                 .proc_handler   = proc_dointvec_minmax,
945                 .extra1         = &zero,
946                 .extra2         = &one,
947         },
948 #ifdef CONFIG_SMP
949         {
950                 .procname       = "hardlockup_all_cpu_backtrace",
951                 .data           = &sysctl_hardlockup_all_cpu_backtrace,
952                 .maxlen         = sizeof(int),
953                 .mode           = 0644,
954                 .proc_handler   = proc_dointvec_minmax,
955                 .extra1         = &zero,
956                 .extra2         = &one,
957         },
958 #endif /* CONFIG_SMP */
959 #endif
960 #endif
961
962 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
963         {
964                 .procname       = "unknown_nmi_panic",
965                 .data           = &unknown_nmi_panic,
966                 .maxlen         = sizeof (int),
967                 .mode           = 0644,
968                 .proc_handler   = proc_dointvec,
969         },
970 #endif
971 #if defined(CONFIG_X86)
972         {
973                 .procname       = "panic_on_unrecovered_nmi",
974                 .data           = &panic_on_unrecovered_nmi,
975                 .maxlen         = sizeof(int),
976                 .mode           = 0644,
977                 .proc_handler   = proc_dointvec,
978         },
979         {
980                 .procname       = "panic_on_io_nmi",
981                 .data           = &panic_on_io_nmi,
982                 .maxlen         = sizeof(int),
983                 .mode           = 0644,
984                 .proc_handler   = proc_dointvec,
985         },
986 #ifdef CONFIG_DEBUG_STACKOVERFLOW
987         {
988                 .procname       = "panic_on_stackoverflow",
989                 .data           = &sysctl_panic_on_stackoverflow,
990                 .maxlen         = sizeof(int),
991                 .mode           = 0644,
992                 .proc_handler   = proc_dointvec,
993         },
994 #endif
995         {
996                 .procname       = "bootloader_type",
997                 .data           = &bootloader_type,
998                 .maxlen         = sizeof (int),
999                 .mode           = 0444,
1000                 .proc_handler   = proc_dointvec,
1001         },
1002         {
1003                 .procname       = "bootloader_version",
1004                 .data           = &bootloader_version,
1005                 .maxlen         = sizeof (int),
1006                 .mode           = 0444,
1007                 .proc_handler   = proc_dointvec,
1008         },
1009         {
1010                 .procname       = "io_delay_type",
1011                 .data           = &io_delay_type,
1012                 .maxlen         = sizeof(int),
1013                 .mode           = 0644,
1014                 .proc_handler   = proc_dointvec,
1015         },
1016 #endif
1017 #if defined(CONFIG_MMU)
1018         {
1019                 .procname       = "randomize_va_space",
1020                 .data           = &randomize_va_space,
1021                 .maxlen         = sizeof(int),
1022                 .mode           = 0644,
1023                 .proc_handler   = proc_dointvec,
1024         },
1025 #endif
1026 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
1027         {
1028                 .procname       = "spin_retry",
1029                 .data           = &spin_retry,
1030                 .maxlen         = sizeof (int),
1031                 .mode           = 0644,
1032                 .proc_handler   = proc_dointvec,
1033         },
1034 #endif
1035 #if     defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
1036         {
1037                 .procname       = "acpi_video_flags",
1038                 .data           = &acpi_realmode_flags,
1039                 .maxlen         = sizeof (unsigned long),
1040                 .mode           = 0644,
1041                 .proc_handler   = proc_doulongvec_minmax,
1042         },
1043 #endif
1044 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
1045         {
1046                 .procname       = "ignore-unaligned-usertrap",
1047                 .data           = &no_unaligned_warning,
1048                 .maxlen         = sizeof (int),
1049                 .mode           = 0644,
1050                 .proc_handler   = proc_dointvec,
1051         },
1052 #endif
1053 #ifdef CONFIG_IA64
1054         {
1055                 .procname       = "unaligned-dump-stack",
1056                 .data           = &unaligned_dump_stack,
1057                 .maxlen         = sizeof (int),
1058                 .mode           = 0644,
1059                 .proc_handler   = proc_dointvec,
1060         },
1061 #endif
1062 #ifdef CONFIG_DETECT_HUNG_TASK
1063         {
1064                 .procname       = "hung_task_panic",
1065                 .data           = &sysctl_hung_task_panic,
1066                 .maxlen         = sizeof(int),
1067                 .mode           = 0644,
1068                 .proc_handler   = proc_dointvec_minmax,
1069                 .extra1         = &zero,
1070                 .extra2         = &one,
1071         },
1072         {
1073                 .procname       = "hung_task_check_count",
1074                 .data           = &sysctl_hung_task_check_count,
1075                 .maxlen         = sizeof(int),
1076                 .mode           = 0644,
1077                 .proc_handler   = proc_dointvec_minmax,
1078                 .extra1         = &zero,
1079         },
1080         {
1081                 .procname       = "hung_task_timeout_secs",
1082                 .data           = &sysctl_hung_task_timeout_secs,
1083                 .maxlen         = sizeof(unsigned long),
1084                 .mode           = 0644,
1085                 .proc_handler   = proc_dohung_task_timeout_secs,
1086                 .extra2         = &hung_task_timeout_max,
1087         },
1088         {
1089                 .procname       = "hung_task_warnings",
1090                 .data           = &sysctl_hung_task_warnings,
1091                 .maxlen         = sizeof(int),
1092                 .mode           = 0644,
1093                 .proc_handler   = proc_dointvec_minmax,
1094                 .extra1         = &neg_one,
1095         },
1096 #endif
1097 #ifdef CONFIG_RT_MUTEXES
1098         {
1099                 .procname       = "max_lock_depth",
1100                 .data           = &max_lock_depth,
1101                 .maxlen         = sizeof(int),
1102                 .mode           = 0644,
1103                 .proc_handler   = proc_dointvec,
1104         },
1105 #endif
1106         {
1107                 .procname       = "poweroff_cmd",
1108                 .data           = &poweroff_cmd,
1109                 .maxlen         = POWEROFF_CMD_PATH_LEN,
1110                 .mode           = 0644,
1111                 .proc_handler   = proc_dostring,
1112         },
1113 #ifdef CONFIG_KEYS
1114         {
1115                 .procname       = "keys",
1116                 .mode           = 0555,
1117                 .child          = key_sysctls,
1118         },
1119 #endif
1120 #ifdef CONFIG_PERF_EVENTS
1121         /*
1122          * User-space scripts rely on the existence of this file
1123          * as a feature check for perf_events being enabled.
1124          *
1125          * So it's an ABI, do not remove!
1126          */
1127         {
1128                 .procname       = "perf_event_paranoid",
1129                 .data           = &sysctl_perf_event_paranoid,
1130                 .maxlen         = sizeof(sysctl_perf_event_paranoid),
1131                 .mode           = 0644,
1132                 .proc_handler   = proc_dointvec,
1133         },
1134         {
1135                 .procname       = "perf_event_mlock_kb",
1136                 .data           = &sysctl_perf_event_mlock,
1137                 .maxlen         = sizeof(sysctl_perf_event_mlock),
1138                 .mode           = 0644,
1139                 .proc_handler   = proc_dointvec,
1140         },
1141         {
1142                 .procname       = "perf_event_max_sample_rate",
1143                 .data           = &sysctl_perf_event_sample_rate,
1144                 .maxlen         = sizeof(sysctl_perf_event_sample_rate),
1145                 .mode           = 0644,
1146                 .proc_handler   = perf_proc_update_handler,
1147                 .extra1         = &one,
1148         },
1149         {
1150                 .procname       = "perf_cpu_time_max_percent",
1151                 .data           = &sysctl_perf_cpu_time_max_percent,
1152                 .maxlen         = sizeof(sysctl_perf_cpu_time_max_percent),
1153                 .mode           = 0644,
1154                 .proc_handler   = perf_cpu_time_max_percent_handler,
1155                 .extra1         = &zero,
1156                 .extra2         = &one_hundred,
1157         },
1158         {
1159                 .procname       = "perf_event_max_stack",
1160                 .data           = &sysctl_perf_event_max_stack,
1161                 .maxlen         = sizeof(sysctl_perf_event_max_stack),
1162                 .mode           = 0644,
1163                 .proc_handler   = perf_event_max_stack_handler,
1164                 .extra1         = &zero,
1165                 .extra2         = &six_hundred_forty_kb,
1166         },
1167         {
1168                 .procname       = "perf_event_max_contexts_per_stack",
1169                 .data           = &sysctl_perf_event_max_contexts_per_stack,
1170                 .maxlen         = sizeof(sysctl_perf_event_max_contexts_per_stack),
1171                 .mode           = 0644,
1172                 .proc_handler   = perf_event_max_stack_handler,
1173                 .extra1         = &zero,
1174                 .extra2         = &one_thousand,
1175         },
1176 #endif
1177         {
1178                 .procname       = "panic_on_warn",
1179                 .data           = &panic_on_warn,
1180                 .maxlen         = sizeof(int),
1181                 .mode           = 0644,
1182                 .proc_handler   = proc_dointvec_minmax,
1183                 .extra1         = &zero,
1184                 .extra2         = &one,
1185         },
1186 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
1187         {
1188                 .procname       = "timer_migration",
1189                 .data           = &sysctl_timer_migration,
1190                 .maxlen         = sizeof(unsigned int),
1191                 .mode           = 0644,
1192                 .proc_handler   = timer_migration_handler,
1193                 .extra1         = &zero,
1194                 .extra2         = &one,
1195         },
1196 #endif
1197 #ifdef CONFIG_BPF_SYSCALL
1198         {
1199                 .procname       = "unprivileged_bpf_disabled",
1200                 .data           = &sysctl_unprivileged_bpf_disabled,
1201                 .maxlen         = sizeof(sysctl_unprivileged_bpf_disabled),
1202                 .mode           = 0644,
1203                 /* only handle a transition from default "0" to "1" */
1204                 .proc_handler   = proc_dointvec_minmax,
1205                 .extra1         = &one,
1206                 .extra2         = &one,
1207         },
1208 #endif
1209 #if defined(CONFIG_TREE_RCU) || defined(CONFIG_PREEMPT_RCU)
1210         {
1211                 .procname       = "panic_on_rcu_stall",
1212                 .data           = &sysctl_panic_on_rcu_stall,
1213                 .maxlen         = sizeof(sysctl_panic_on_rcu_stall),
1214                 .mode           = 0644,
1215                 .proc_handler   = proc_dointvec_minmax,
1216                 .extra1         = &zero,
1217                 .extra2         = &one,
1218         },
1219 #endif
1220         { }
1221 };
1222
1223 static struct ctl_table vm_table[] = {
1224         {
1225                 .procname       = "overcommit_memory",
1226                 .data           = &sysctl_overcommit_memory,
1227                 .maxlen         = sizeof(sysctl_overcommit_memory),
1228                 .mode           = 0644,
1229                 .proc_handler   = proc_dointvec_minmax,
1230                 .extra1         = &zero,
1231                 .extra2         = &two,
1232         },
1233         {
1234                 .procname       = "panic_on_oom",
1235                 .data           = &sysctl_panic_on_oom,
1236                 .maxlen         = sizeof(sysctl_panic_on_oom),
1237                 .mode           = 0644,
1238                 .proc_handler   = proc_dointvec_minmax,
1239                 .extra1         = &zero,
1240                 .extra2         = &two,
1241         },
1242         {
1243                 .procname       = "oom_kill_allocating_task",
1244                 .data           = &sysctl_oom_kill_allocating_task,
1245                 .maxlen         = sizeof(sysctl_oom_kill_allocating_task),
1246                 .mode           = 0644,
1247                 .proc_handler   = proc_dointvec,
1248         },
1249         {
1250                 .procname       = "oom_dump_tasks",
1251                 .data           = &sysctl_oom_dump_tasks,
1252                 .maxlen         = sizeof(sysctl_oom_dump_tasks),
1253                 .mode           = 0644,
1254                 .proc_handler   = proc_dointvec,
1255         },
1256         {
1257                 .procname       = "overcommit_ratio",
1258                 .data           = &sysctl_overcommit_ratio,
1259                 .maxlen         = sizeof(sysctl_overcommit_ratio),
1260                 .mode           = 0644,
1261                 .proc_handler   = overcommit_ratio_handler,
1262         },
1263         {
1264                 .procname       = "overcommit_kbytes",
1265                 .data           = &sysctl_overcommit_kbytes,
1266                 .maxlen         = sizeof(sysctl_overcommit_kbytes),
1267                 .mode           = 0644,
1268                 .proc_handler   = overcommit_kbytes_handler,
1269         },
1270         {
1271                 .procname       = "page-cluster", 
1272                 .data           = &page_cluster,
1273                 .maxlen         = sizeof(int),
1274                 .mode           = 0644,
1275                 .proc_handler   = proc_dointvec_minmax,
1276                 .extra1         = &zero,
1277         },
1278         {
1279                 .procname       = "dirty_background_ratio",
1280                 .data           = &dirty_background_ratio,
1281                 .maxlen         = sizeof(dirty_background_ratio),
1282                 .mode           = 0644,
1283                 .proc_handler   = dirty_background_ratio_handler,
1284                 .extra1         = &zero,
1285                 .extra2         = &one_hundred,
1286         },
1287         {
1288                 .procname       = "dirty_background_bytes",
1289                 .data           = &dirty_background_bytes,
1290                 .maxlen         = sizeof(dirty_background_bytes),
1291                 .mode           = 0644,
1292                 .proc_handler   = dirty_background_bytes_handler,
1293                 .extra1         = &one_ul,
1294         },
1295         {
1296                 .procname       = "dirty_ratio",
1297                 .data           = &vm_dirty_ratio,
1298                 .maxlen         = sizeof(vm_dirty_ratio),
1299                 .mode           = 0644,
1300                 .proc_handler   = dirty_ratio_handler,
1301                 .extra1         = &zero,
1302                 .extra2         = &one_hundred,
1303         },
1304         {
1305                 .procname       = "dirty_bytes",
1306                 .data           = &vm_dirty_bytes,
1307                 .maxlen         = sizeof(vm_dirty_bytes),
1308                 .mode           = 0644,
1309                 .proc_handler   = dirty_bytes_handler,
1310                 .extra1         = &dirty_bytes_min,
1311         },
1312         {
1313                 .procname       = "dirty_writeback_centisecs",
1314                 .data           = &dirty_writeback_interval,
1315                 .maxlen         = sizeof(dirty_writeback_interval),
1316                 .mode           = 0644,
1317                 .proc_handler   = dirty_writeback_centisecs_handler,
1318         },
1319         {
1320                 .procname       = "dirty_expire_centisecs",
1321                 .data           = &dirty_expire_interval,
1322                 .maxlen         = sizeof(dirty_expire_interval),
1323                 .mode           = 0644,
1324                 .proc_handler   = proc_dointvec_minmax,
1325                 .extra1         = &zero,
1326         },
1327         {
1328                 .procname       = "dirtytime_expire_seconds",
1329                 .data           = &dirtytime_expire_interval,
1330                 .maxlen         = sizeof(dirty_expire_interval),
1331                 .mode           = 0644,
1332                 .proc_handler   = dirtytime_interval_handler,
1333                 .extra1         = &zero,
1334         },
1335         {
1336                 .procname       = "swappiness",
1337                 .data           = &vm_swappiness,
1338                 .maxlen         = sizeof(vm_swappiness),
1339                 .mode           = 0644,
1340                 .proc_handler   = proc_dointvec_minmax,
1341                 .extra1         = &zero,
1342                 .extra2         = &one_hundred,
1343         },
1344 #ifdef CONFIG_HUGETLB_PAGE
1345         {
1346                 .procname       = "nr_hugepages",
1347                 .data           = NULL,
1348                 .maxlen         = sizeof(unsigned long),
1349                 .mode           = 0644,
1350                 .proc_handler   = hugetlb_sysctl_handler,
1351         },
1352 #ifdef CONFIG_NUMA
1353         {
1354                 .procname       = "nr_hugepages_mempolicy",
1355                 .data           = NULL,
1356                 .maxlen         = sizeof(unsigned long),
1357                 .mode           = 0644,
1358                 .proc_handler   = &hugetlb_mempolicy_sysctl_handler,
1359         },
1360         {
1361                 .procname               = "numa_stat",
1362                 .data                   = &sysctl_vm_numa_stat,
1363                 .maxlen                 = sizeof(int),
1364                 .mode                   = 0644,
1365                 .proc_handler   = sysctl_vm_numa_stat_handler,
1366                 .extra1                 = &zero,
1367                 .extra2                 = &one,
1368         },
1369 #endif
1370          {
1371                 .procname       = "hugetlb_shm_group",
1372                 .data           = &sysctl_hugetlb_shm_group,
1373                 .maxlen         = sizeof(gid_t),
1374                 .mode           = 0644,
1375                 .proc_handler   = proc_dointvec,
1376          },
1377          {
1378                 .procname       = "hugepages_treat_as_movable",
1379                 .data           = &hugepages_treat_as_movable,
1380                 .maxlen         = sizeof(int),
1381                 .mode           = 0644,
1382                 .proc_handler   = proc_dointvec,
1383         },
1384         {
1385                 .procname       = "nr_overcommit_hugepages",
1386                 .data           = NULL,
1387                 .maxlen         = sizeof(unsigned long),
1388                 .mode           = 0644,
1389                 .proc_handler   = hugetlb_overcommit_handler,
1390         },
1391 #endif
1392         {
1393                 .procname       = "lowmem_reserve_ratio",
1394                 .data           = &sysctl_lowmem_reserve_ratio,
1395                 .maxlen         = sizeof(sysctl_lowmem_reserve_ratio),
1396                 .mode           = 0644,
1397                 .proc_handler   = lowmem_reserve_ratio_sysctl_handler,
1398         },
1399         {
1400                 .procname       = "drop_caches",
1401                 .data           = &sysctl_drop_caches,
1402                 .maxlen         = sizeof(int),
1403                 .mode           = 0644,
1404                 .proc_handler   = drop_caches_sysctl_handler,
1405                 .extra1         = &one,
1406                 .extra2         = &four,
1407         },
1408 #ifdef CONFIG_COMPACTION
1409         {
1410                 .procname       = "compact_memory",
1411                 .data           = &sysctl_compact_memory,
1412                 .maxlen         = sizeof(int),
1413                 .mode           = 0200,
1414                 .proc_handler   = sysctl_compaction_handler,
1415         },
1416         {
1417                 .procname       = "extfrag_threshold",
1418                 .data           = &sysctl_extfrag_threshold,
1419                 .maxlen         = sizeof(int),
1420                 .mode           = 0644,
1421                 .proc_handler   = sysctl_extfrag_handler,
1422                 .extra1         = &min_extfrag_threshold,
1423                 .extra2         = &max_extfrag_threshold,
1424         },
1425         {
1426                 .procname       = "compact_unevictable_allowed",
1427                 .data           = &sysctl_compact_unevictable_allowed,
1428                 .maxlen         = sizeof(int),
1429                 .mode           = 0644,
1430                 .proc_handler   = proc_dointvec,
1431                 .extra1         = &zero,
1432                 .extra2         = &one,
1433         },
1434
1435 #endif /* CONFIG_COMPACTION */
1436         {
1437                 .procname       = "min_free_kbytes",
1438                 .data           = &min_free_kbytes,
1439                 .maxlen         = sizeof(min_free_kbytes),
1440                 .mode           = 0644,
1441                 .proc_handler   = min_free_kbytes_sysctl_handler,
1442                 .extra1         = &zero,
1443         },
1444         {
1445                 .procname       = "watermark_scale_factor",
1446                 .data           = &watermark_scale_factor,
1447                 .maxlen         = sizeof(watermark_scale_factor),
1448                 .mode           = 0644,
1449                 .proc_handler   = watermark_scale_factor_sysctl_handler,
1450                 .extra1         = &one,
1451                 .extra2         = &one_thousand,
1452         },
1453         {
1454                 .procname       = "percpu_pagelist_fraction",
1455                 .data           = &percpu_pagelist_fraction,
1456                 .maxlen         = sizeof(percpu_pagelist_fraction),
1457                 .mode           = 0644,
1458                 .proc_handler   = percpu_pagelist_fraction_sysctl_handler,
1459                 .extra1         = &zero,
1460         },
1461 #ifdef CONFIG_MMU
1462         {
1463                 .procname       = "max_map_count",
1464                 .data           = &sysctl_max_map_count,
1465                 .maxlen         = sizeof(sysctl_max_map_count),
1466                 .mode           = 0644,
1467                 .proc_handler   = proc_dointvec_minmax,
1468                 .extra1         = &zero,
1469         },
1470 #else
1471         {
1472                 .procname       = "nr_trim_pages",
1473                 .data           = &sysctl_nr_trim_pages,
1474                 .maxlen         = sizeof(sysctl_nr_trim_pages),
1475                 .mode           = 0644,
1476                 .proc_handler   = proc_dointvec_minmax,
1477                 .extra1         = &zero,
1478         },
1479 #endif
1480         {
1481                 .procname       = "laptop_mode",
1482                 .data           = &laptop_mode,
1483                 .maxlen         = sizeof(laptop_mode),
1484                 .mode           = 0644,
1485                 .proc_handler   = proc_dointvec_jiffies,
1486         },
1487         {
1488                 .procname       = "block_dump",
1489                 .data           = &block_dump,
1490                 .maxlen         = sizeof(block_dump),
1491                 .mode           = 0644,
1492                 .proc_handler   = proc_dointvec,
1493                 .extra1         = &zero,
1494         },
1495         {
1496                 .procname       = "vfs_cache_pressure",
1497                 .data           = &sysctl_vfs_cache_pressure,
1498                 .maxlen         = sizeof(sysctl_vfs_cache_pressure),
1499                 .mode           = 0644,
1500                 .proc_handler   = proc_dointvec,
1501                 .extra1         = &zero,
1502         },
1503 #ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
1504         {
1505                 .procname       = "legacy_va_layout",
1506                 .data           = &sysctl_legacy_va_layout,
1507                 .maxlen         = sizeof(sysctl_legacy_va_layout),
1508                 .mode           = 0644,
1509                 .proc_handler   = proc_dointvec,
1510                 .extra1         = &zero,
1511         },
1512 #endif
1513 #ifdef CONFIG_NUMA
1514         {
1515                 .procname       = "zone_reclaim_mode",
1516                 .data           = &node_reclaim_mode,
1517                 .maxlen         = sizeof(node_reclaim_mode),
1518                 .mode           = 0644,
1519                 .proc_handler   = proc_dointvec,
1520                 .extra1         = &zero,
1521         },
1522         {
1523                 .procname       = "min_unmapped_ratio",
1524                 .data           = &sysctl_min_unmapped_ratio,
1525                 .maxlen         = sizeof(sysctl_min_unmapped_ratio),
1526                 .mode           = 0644,
1527                 .proc_handler   = sysctl_min_unmapped_ratio_sysctl_handler,
1528                 .extra1         = &zero,
1529                 .extra2         = &one_hundred,
1530         },
1531         {
1532                 .procname       = "min_slab_ratio",
1533                 .data           = &sysctl_min_slab_ratio,
1534                 .maxlen         = sizeof(sysctl_min_slab_ratio),
1535                 .mode           = 0644,
1536                 .proc_handler   = sysctl_min_slab_ratio_sysctl_handler,
1537                 .extra1         = &zero,
1538                 .extra2         = &one_hundred,
1539         },
1540 #endif
1541 #ifdef CONFIG_SMP
1542         {
1543                 .procname       = "stat_interval",
1544                 .data           = &sysctl_stat_interval,
1545                 .maxlen         = sizeof(sysctl_stat_interval),
1546                 .mode           = 0644,
1547                 .proc_handler   = proc_dointvec_jiffies,
1548         },
1549         {
1550                 .procname       = "stat_refresh",
1551                 .data           = NULL,
1552                 .maxlen         = 0,
1553                 .mode           = 0600,
1554                 .proc_handler   = vmstat_refresh,
1555         },
1556 #endif
1557 #ifdef CONFIG_MMU
1558         {
1559                 .procname       = "mmap_min_addr",
1560                 .data           = &dac_mmap_min_addr,
1561                 .maxlen         = sizeof(unsigned long),
1562                 .mode           = 0644,
1563                 .proc_handler   = mmap_min_addr_handler,
1564         },
1565 #endif
1566 #ifdef CONFIG_NUMA
1567         {
1568                 .procname       = "numa_zonelist_order",
1569                 .data           = &numa_zonelist_order,
1570                 .maxlen         = NUMA_ZONELIST_ORDER_LEN,
1571                 .mode           = 0644,
1572                 .proc_handler   = numa_zonelist_order_handler,
1573         },
1574 #endif
1575 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
1576    (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
1577         {
1578                 .procname       = "vdso_enabled",
1579 #ifdef CONFIG_X86_32
1580                 .data           = &vdso32_enabled,
1581                 .maxlen         = sizeof(vdso32_enabled),
1582 #else
1583                 .data           = &vdso_enabled,
1584                 .maxlen         = sizeof(vdso_enabled),
1585 #endif
1586                 .mode           = 0644,
1587                 .proc_handler   = proc_dointvec,
1588                 .extra1         = &zero,
1589         },
1590 #endif
1591 #ifdef CONFIG_HIGHMEM
1592         {
1593                 .procname       = "highmem_is_dirtyable",
1594                 .data           = &vm_highmem_is_dirtyable,
1595                 .maxlen         = sizeof(vm_highmem_is_dirtyable),
1596                 .mode           = 0644,
1597                 .proc_handler   = proc_dointvec_minmax,
1598                 .extra1         = &zero,
1599                 .extra2         = &one,
1600         },
1601 #endif
1602 #ifdef CONFIG_MEMORY_FAILURE
1603         {
1604                 .procname       = "memory_failure_early_kill",
1605                 .data           = &sysctl_memory_failure_early_kill,
1606                 .maxlen         = sizeof(sysctl_memory_failure_early_kill),
1607                 .mode           = 0644,
1608                 .proc_handler   = proc_dointvec_minmax,
1609                 .extra1         = &zero,
1610                 .extra2         = &one,
1611         },
1612         {
1613                 .procname       = "memory_failure_recovery",
1614                 .data           = &sysctl_memory_failure_recovery,
1615                 .maxlen         = sizeof(sysctl_memory_failure_recovery),
1616                 .mode           = 0644,
1617                 .proc_handler   = proc_dointvec_minmax,
1618                 .extra1         = &zero,
1619                 .extra2         = &one,
1620         },
1621 #endif
1622         {
1623                 .procname       = "user_reserve_kbytes",
1624                 .data           = &sysctl_user_reserve_kbytes,
1625                 .maxlen         = sizeof(sysctl_user_reserve_kbytes),
1626                 .mode           = 0644,
1627                 .proc_handler   = proc_doulongvec_minmax,
1628         },
1629         {
1630                 .procname       = "admin_reserve_kbytes",
1631                 .data           = &sysctl_admin_reserve_kbytes,
1632                 .maxlen         = sizeof(sysctl_admin_reserve_kbytes),
1633                 .mode           = 0644,
1634                 .proc_handler   = proc_doulongvec_minmax,
1635         },
1636 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS
1637         {
1638                 .procname       = "mmap_rnd_bits",
1639                 .data           = &mmap_rnd_bits,
1640                 .maxlen         = sizeof(mmap_rnd_bits),
1641                 .mode           = 0600,
1642                 .proc_handler   = proc_dointvec_minmax,
1643                 .extra1         = (void *)&mmap_rnd_bits_min,
1644                 .extra2         = (void *)&mmap_rnd_bits_max,
1645         },
1646 #endif
1647 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS
1648         {
1649                 .procname       = "mmap_rnd_compat_bits",
1650                 .data           = &mmap_rnd_compat_bits,
1651                 .maxlen         = sizeof(mmap_rnd_compat_bits),
1652                 .mode           = 0600,
1653                 .proc_handler   = proc_dointvec_minmax,
1654                 .extra1         = (void *)&mmap_rnd_compat_bits_min,
1655                 .extra2         = (void *)&mmap_rnd_compat_bits_max,
1656         },
1657 #endif
1658         { }
1659 };
1660
1661 static struct ctl_table fs_table[] = {
1662         {
1663                 .procname       = "inode-nr",
1664                 .data           = &inodes_stat,
1665                 .maxlen         = 2*sizeof(long),
1666                 .mode           = 0444,
1667                 .proc_handler   = proc_nr_inodes,
1668         },
1669         {
1670                 .procname       = "inode-state",
1671                 .data           = &inodes_stat,
1672                 .maxlen         = 7*sizeof(long),
1673                 .mode           = 0444,
1674                 .proc_handler   = proc_nr_inodes,
1675         },
1676         {
1677                 .procname       = "file-nr",
1678                 .data           = &files_stat,
1679                 .maxlen         = sizeof(files_stat),
1680                 .mode           = 0444,
1681                 .proc_handler   = proc_nr_files,
1682         },
1683         {
1684                 .procname       = "file-max",
1685                 .data           = &files_stat.max_files,
1686                 .maxlen         = sizeof(files_stat.max_files),
1687                 .mode           = 0644,
1688                 .proc_handler   = proc_doulongvec_minmax,
1689         },
1690         {
1691                 .procname       = "nr_open",
1692                 .data           = &sysctl_nr_open,
1693                 .maxlen         = sizeof(unsigned int),
1694                 .mode           = 0644,
1695                 .proc_handler   = proc_dointvec_minmax,
1696                 .extra1         = &sysctl_nr_open_min,
1697                 .extra2         = &sysctl_nr_open_max,
1698         },
1699         {
1700                 .procname       = "dentry-state",
1701                 .data           = &dentry_stat,
1702                 .maxlen         = 6*sizeof(long),
1703                 .mode           = 0444,
1704                 .proc_handler   = proc_nr_dentry,
1705         },
1706         {
1707                 .procname       = "overflowuid",
1708                 .data           = &fs_overflowuid,
1709                 .maxlen         = sizeof(int),
1710                 .mode           = 0644,
1711                 .proc_handler   = proc_dointvec_minmax,
1712                 .extra1         = &minolduid,
1713                 .extra2         = &maxolduid,
1714         },
1715         {
1716                 .procname       = "overflowgid",
1717                 .data           = &fs_overflowgid,
1718                 .maxlen         = sizeof(int),
1719                 .mode           = 0644,
1720                 .proc_handler   = proc_dointvec_minmax,
1721                 .extra1         = &minolduid,
1722                 .extra2         = &maxolduid,
1723         },
1724 #ifdef CONFIG_FILE_LOCKING
1725         {
1726                 .procname       = "leases-enable",
1727                 .data           = &leases_enable,
1728                 .maxlen         = sizeof(int),
1729                 .mode           = 0644,
1730                 .proc_handler   = proc_dointvec,
1731         },
1732 #endif
1733 #ifdef CONFIG_DNOTIFY
1734         {
1735                 .procname       = "dir-notify-enable",
1736                 .data           = &dir_notify_enable,
1737                 .maxlen         = sizeof(int),
1738                 .mode           = 0644,
1739                 .proc_handler   = proc_dointvec,
1740         },
1741 #endif
1742 #ifdef CONFIG_MMU
1743 #ifdef CONFIG_FILE_LOCKING
1744         {
1745                 .procname       = "lease-break-time",
1746                 .data           = &lease_break_time,
1747                 .maxlen         = sizeof(int),
1748                 .mode           = 0644,
1749                 .proc_handler   = proc_dointvec,
1750         },
1751 #endif
1752 #ifdef CONFIG_AIO
1753         {
1754                 .procname       = "aio-nr",
1755                 .data           = &aio_nr,
1756                 .maxlen         = sizeof(aio_nr),
1757                 .mode           = 0444,
1758                 .proc_handler   = proc_doulongvec_minmax,
1759         },
1760         {
1761                 .procname       = "aio-max-nr",
1762                 .data           = &aio_max_nr,
1763                 .maxlen         = sizeof(aio_max_nr),
1764                 .mode           = 0644,
1765                 .proc_handler   = proc_doulongvec_minmax,
1766         },
1767 #endif /* CONFIG_AIO */
1768 #ifdef CONFIG_INOTIFY_USER
1769         {
1770                 .procname       = "inotify",
1771                 .mode           = 0555,
1772                 .child          = inotify_table,
1773         },
1774 #endif  
1775 #ifdef CONFIG_EPOLL
1776         {
1777                 .procname       = "epoll",
1778                 .mode           = 0555,
1779                 .child          = epoll_table,
1780         },
1781 #endif
1782 #endif
1783         {
1784                 .procname       = "protected_symlinks",
1785                 .data           = &sysctl_protected_symlinks,
1786                 .maxlen         = sizeof(int),
1787                 .mode           = 0600,
1788                 .proc_handler   = proc_dointvec_minmax,
1789                 .extra1         = &zero,
1790                 .extra2         = &one,
1791         },
1792         {
1793                 .procname       = "protected_hardlinks",
1794                 .data           = &sysctl_protected_hardlinks,
1795                 .maxlen         = sizeof(int),
1796                 .mode           = 0600,
1797                 .proc_handler   = proc_dointvec_minmax,
1798                 .extra1         = &zero,
1799                 .extra2         = &one,
1800         },
1801         {
1802                 .procname       = "suid_dumpable",
1803                 .data           = &suid_dumpable,
1804                 .maxlen         = sizeof(int),
1805                 .mode           = 0644,
1806                 .proc_handler   = proc_dointvec_minmax_coredump,
1807                 .extra1         = &zero,
1808                 .extra2         = &two,
1809         },
1810 #if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
1811         {
1812                 .procname       = "binfmt_misc",
1813                 .mode           = 0555,
1814                 .child          = sysctl_mount_point,
1815         },
1816 #endif
1817         {
1818                 .procname       = "pipe-max-size",
1819                 .data           = &pipe_max_size,
1820                 .maxlen         = sizeof(pipe_max_size),
1821                 .mode           = 0644,
1822                 .proc_handler   = &pipe_proc_fn,
1823                 .extra1         = &pipe_min_size,
1824         },
1825         {
1826                 .procname       = "pipe-user-pages-hard",
1827                 .data           = &pipe_user_pages_hard,
1828                 .maxlen         = sizeof(pipe_user_pages_hard),
1829                 .mode           = 0644,
1830                 .proc_handler   = proc_doulongvec_minmax,
1831         },
1832         {
1833                 .procname       = "pipe-user-pages-soft",
1834                 .data           = &pipe_user_pages_soft,
1835                 .maxlen         = sizeof(pipe_user_pages_soft),
1836                 .mode           = 0644,
1837                 .proc_handler   = proc_doulongvec_minmax,
1838         },
1839         {
1840                 .procname       = "mount-max",
1841                 .data           = &sysctl_mount_max,
1842                 .maxlen         = sizeof(unsigned int),
1843                 .mode           = 0644,
1844                 .proc_handler   = proc_dointvec_minmax,
1845                 .extra1         = &one,
1846         },
1847         { }
1848 };
1849
1850 static struct ctl_table debug_table[] = {
1851 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
1852         {
1853                 .procname       = "exception-trace",
1854                 .data           = &show_unhandled_signals,
1855                 .maxlen         = sizeof(int),
1856                 .mode           = 0644,
1857                 .proc_handler   = proc_dointvec
1858         },
1859 #endif
1860 #if defined(CONFIG_OPTPROBES)
1861         {
1862                 .procname       = "kprobes-optimization",
1863                 .data           = &sysctl_kprobes_optimization,
1864                 .maxlen         = sizeof(int),
1865                 .mode           = 0644,
1866                 .proc_handler   = proc_kprobes_optimization_handler,
1867                 .extra1         = &zero,
1868                 .extra2         = &one,
1869         },
1870 #endif
1871         { }
1872 };
1873
1874 static struct ctl_table dev_table[] = {
1875         { }
1876 };
1877
1878 int __init sysctl_init(void)
1879 {
1880         struct ctl_table_header *hdr;
1881
1882         hdr = register_sysctl_table(sysctl_base_table);
1883         kmemleak_not_leak(hdr);
1884         return 0;
1885 }
1886
1887 #endif /* CONFIG_SYSCTL */
1888
1889 /*
1890  * /proc/sys support
1891  */
1892
1893 #ifdef CONFIG_PROC_SYSCTL
1894
1895 static int _proc_do_string(char *data, int maxlen, int write,
1896                            char __user *buffer,
1897                            size_t *lenp, loff_t *ppos)
1898 {
1899         size_t len;
1900         char __user *p;
1901         char c;
1902
1903         if (!data || !maxlen || !*lenp) {
1904                 *lenp = 0;
1905                 return 0;
1906         }
1907
1908         if (write) {
1909                 if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) {
1910                         /* Only continue writes not past the end of buffer. */
1911                         len = strlen(data);
1912                         if (len > maxlen - 1)
1913                                 len = maxlen - 1;
1914
1915                         if (*ppos > len)
1916                                 return 0;
1917                         len = *ppos;
1918                 } else {
1919                         /* Start writing from beginning of buffer. */
1920                         len = 0;
1921                 }
1922
1923                 *ppos += *lenp;
1924                 p = buffer;
1925                 while ((p - buffer) < *lenp && len < maxlen - 1) {
1926                         if (get_user(c, p++))
1927                                 return -EFAULT;
1928                         if (c == 0 || c == '\n')
1929                                 break;
1930                         data[len++] = c;
1931                 }
1932                 data[len] = 0;
1933         } else {
1934                 len = strlen(data);
1935                 if (len > maxlen)
1936                         len = maxlen;
1937
1938                 if (*ppos > len) {
1939                         *lenp = 0;
1940                         return 0;
1941                 }
1942
1943                 data += *ppos;
1944                 len  -= *ppos;
1945
1946                 if (len > *lenp)
1947                         len = *lenp;
1948                 if (len)
1949                         if (copy_to_user(buffer, data, len))
1950                                 return -EFAULT;
1951                 if (len < *lenp) {
1952                         if (put_user('\n', buffer + len))
1953                                 return -EFAULT;
1954                         len++;
1955                 }
1956                 *lenp = len;
1957                 *ppos += len;
1958         }
1959         return 0;
1960 }
1961
1962 static void warn_sysctl_write(struct ctl_table *table)
1963 {
1964         pr_warn_once("%s wrote to %s when file position was not 0!\n"
1965                 "This will not be supported in the future. To silence this\n"
1966                 "warning, set kernel.sysctl_writes_strict = -1\n",
1967                 current->comm, table->procname);
1968 }
1969
1970 /**
1971  * proc_first_pos_non_zero_ignore - check if firs position is allowed
1972  * @ppos: file position
1973  * @table: the sysctl table
1974  *
1975  * Returns true if the first position is non-zero and the sysctl_writes_strict
1976  * mode indicates this is not allowed for numeric input types. String proc
1977  * hadlers can ignore the return value.
1978  */
1979 static bool proc_first_pos_non_zero_ignore(loff_t *ppos,
1980                                            struct ctl_table *table)
1981 {
1982         if (!*ppos)
1983                 return false;
1984
1985         switch (sysctl_writes_strict) {
1986         case SYSCTL_WRITES_STRICT:
1987                 return true;
1988         case SYSCTL_WRITES_WARN:
1989                 warn_sysctl_write(table);
1990                 return false;
1991         default:
1992                 return false;
1993         }
1994 }
1995
1996 /**
1997  * proc_dostring - read a string sysctl
1998  * @table: the sysctl table
1999  * @write: %TRUE if this is a write to the sysctl file
2000  * @buffer: the user buffer
2001  * @lenp: the size of the user buffer
2002  * @ppos: file position
2003  *
2004  * Reads/writes a string from/to the user buffer. If the kernel
2005  * buffer provided is not large enough to hold the string, the
2006  * string is truncated. The copied string is %NULL-terminated.
2007  * If the string is being read by the user process, it is copied
2008  * and a newline '\n' is added. It is truncated if the buffer is
2009  * not large enough.
2010  *
2011  * Returns 0 on success.
2012  */
2013 int proc_dostring(struct ctl_table *table, int write,
2014                   void __user *buffer, size_t *lenp, loff_t *ppos)
2015 {
2016         if (write)
2017                 proc_first_pos_non_zero_ignore(ppos, table);
2018
2019         return _proc_do_string((char *)(table->data), table->maxlen, write,
2020                                (char __user *)buffer, lenp, ppos);
2021 }
2022
2023 static size_t proc_skip_spaces(char **buf)
2024 {
2025         size_t ret;
2026         char *tmp = skip_spaces(*buf);
2027         ret = tmp - *buf;
2028         *buf = tmp;
2029         return ret;
2030 }
2031
2032 static void proc_skip_char(char **buf, size_t *size, const char v)
2033 {
2034         while (*size) {
2035                 if (**buf != v)
2036                         break;
2037                 (*size)--;
2038                 (*buf)++;
2039         }
2040 }
2041
2042 #define TMPBUFLEN 22
2043 /**
2044  * proc_get_long - reads an ASCII formatted integer from a user buffer
2045  *
2046  * @buf: a kernel buffer
2047  * @size: size of the kernel buffer
2048  * @val: this is where the number will be stored
2049  * @neg: set to %TRUE if number is negative
2050  * @perm_tr: a vector which contains the allowed trailers
2051  * @perm_tr_len: size of the perm_tr vector
2052  * @tr: pointer to store the trailer character
2053  *
2054  * In case of success %0 is returned and @buf and @size are updated with
2055  * the amount of bytes read. If @tr is non-NULL and a trailing
2056  * character exists (size is non-zero after returning from this
2057  * function), @tr is updated with the trailing character.
2058  */
2059 static int proc_get_long(char **buf, size_t *size,
2060                           unsigned long *val, bool *neg,
2061                           const char *perm_tr, unsigned perm_tr_len, char *tr)
2062 {
2063         int len;
2064         char *p, tmp[TMPBUFLEN];
2065
2066         if (!*size)
2067                 return -EINVAL;
2068
2069         len = *size;
2070         if (len > TMPBUFLEN - 1)
2071                 len = TMPBUFLEN - 1;
2072
2073         memcpy(tmp, *buf, len);
2074
2075         tmp[len] = 0;
2076         p = tmp;
2077         if (*p == '-' && *size > 1) {
2078                 *neg = true;
2079                 p++;
2080         } else
2081                 *neg = false;
2082         if (!isdigit(*p))
2083                 return -EINVAL;
2084
2085         *val = simple_strtoul(p, &p, 0);
2086
2087         len = p - tmp;
2088
2089         /* We don't know if the next char is whitespace thus we may accept
2090          * invalid integers (e.g. 1234...a) or two integers instead of one
2091          * (e.g. 123...1). So lets not allow such large numbers. */
2092         if (len == TMPBUFLEN - 1)
2093                 return -EINVAL;
2094
2095         if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
2096                 return -EINVAL;
2097
2098         if (tr && (len < *size))
2099                 *tr = *p;
2100
2101         *buf += len;
2102         *size -= len;
2103
2104         return 0;
2105 }
2106
2107 /**
2108  * proc_put_long - converts an integer to a decimal ASCII formatted string
2109  *
2110  * @buf: the user buffer
2111  * @size: the size of the user buffer
2112  * @val: the integer to be converted
2113  * @neg: sign of the number, %TRUE for negative
2114  *
2115  * In case of success %0 is returned and @buf and @size are updated with
2116  * the amount of bytes written.
2117  */
2118 static int proc_put_long(void __user **buf, size_t *size, unsigned long val,
2119                           bool neg)
2120 {
2121         int len;
2122         char tmp[TMPBUFLEN], *p = tmp;
2123
2124         sprintf(p, "%s%lu", neg ? "-" : "", val);
2125         len = strlen(tmp);
2126         if (len > *size)
2127                 len = *size;
2128         if (copy_to_user(*buf, tmp, len))
2129                 return -EFAULT;
2130         *size -= len;
2131         *buf += len;
2132         return 0;
2133 }
2134 #undef TMPBUFLEN
2135
2136 static int proc_put_char(void __user **buf, size_t *size, char c)
2137 {
2138         if (*size) {
2139                 char __user **buffer = (char __user **)buf;
2140                 if (put_user(c, *buffer))
2141                         return -EFAULT;
2142                 (*size)--, (*buffer)++;
2143                 *buf = *buffer;
2144         }
2145         return 0;
2146 }
2147
2148 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
2149                                  int *valp,
2150                                  int write, void *data)
2151 {
2152         if (write) {
2153                 if (*negp) {
2154                         if (*lvalp > (unsigned long) INT_MAX + 1)
2155                                 return -EINVAL;
2156                         *valp = -*lvalp;
2157                 } else {
2158                         if (*lvalp > (unsigned long) INT_MAX)
2159                                 return -EINVAL;
2160                         *valp = *lvalp;
2161                 }
2162         } else {
2163                 int val = *valp;
2164                 if (val < 0) {
2165                         *negp = true;
2166                         *lvalp = -(unsigned long)val;
2167                 } else {
2168                         *negp = false;
2169                         *lvalp = (unsigned long)val;
2170                 }
2171         }
2172         return 0;
2173 }
2174
2175 static int do_proc_douintvec_conv(unsigned long *lvalp,
2176                                   unsigned int *valp,
2177                                   int write, void *data)
2178 {
2179         if (write) {
2180                 if (*lvalp > UINT_MAX)
2181                         return -EINVAL;
2182                 *valp = *lvalp;
2183         } else {
2184                 unsigned int val = *valp;
2185                 *lvalp = (unsigned long)val;
2186         }
2187         return 0;
2188 }
2189
2190 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
2191
2192 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
2193                   int write, void __user *buffer,
2194                   size_t *lenp, loff_t *ppos,
2195                   int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2196                               int write, void *data),
2197                   void *data)
2198 {
2199         int *i, vleft, first = 1, err = 0;
2200         size_t left;
2201         char *kbuf = NULL, *p;
2202         
2203         if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
2204                 *lenp = 0;
2205                 return 0;
2206         }
2207         
2208         i = (int *) tbl_data;
2209         vleft = table->maxlen / sizeof(*i);
2210         left = *lenp;
2211
2212         if (!conv)
2213                 conv = do_proc_dointvec_conv;
2214
2215         if (write) {
2216                 if (proc_first_pos_non_zero_ignore(ppos, table))
2217                         goto out;
2218
2219                 if (left > PAGE_SIZE - 1)
2220                         left = PAGE_SIZE - 1;
2221                 p = kbuf = memdup_user_nul(buffer, left);
2222                 if (IS_ERR(kbuf))
2223                         return PTR_ERR(kbuf);
2224         }
2225
2226         for (; left && vleft--; i++, first=0) {
2227                 unsigned long lval;
2228                 bool neg;
2229
2230                 if (write) {
2231                         left -= proc_skip_spaces(&p);
2232
2233                         if (!left)
2234                                 break;
2235                         err = proc_get_long(&p, &left, &lval, &neg,
2236                                              proc_wspace_sep,
2237                                              sizeof(proc_wspace_sep), NULL);
2238                         if (err)
2239                                 break;
2240                         if (conv(&neg, &lval, i, 1, data)) {
2241                                 err = -EINVAL;
2242                                 break;
2243                         }
2244                 } else {
2245                         if (conv(&neg, &lval, i, 0, data)) {
2246                                 err = -EINVAL;
2247                                 break;
2248                         }
2249                         if (!first)
2250                                 err = proc_put_char(&buffer, &left, '\t');
2251                         if (err)
2252                                 break;
2253                         err = proc_put_long(&buffer, &left, lval, neg);
2254                         if (err)
2255                                 break;
2256                 }
2257         }
2258
2259         if (!write && !first && left && !err)
2260                 err = proc_put_char(&buffer, &left, '\n');
2261         if (write && !err && left)
2262                 left -= proc_skip_spaces(&p);
2263         if (write) {
2264                 kfree(kbuf);
2265                 if (first)
2266                         return err ? : -EINVAL;
2267         }
2268         *lenp -= left;
2269 out:
2270         *ppos += *lenp;
2271         return err;
2272 }
2273
2274 static int do_proc_dointvec(struct ctl_table *table, int write,
2275                   void __user *buffer, size_t *lenp, loff_t *ppos,
2276                   int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
2277                               int write, void *data),
2278                   void *data)
2279 {
2280         return __do_proc_dointvec(table->data, table, write,
2281                         buffer, lenp, ppos, conv, data);
2282 }
2283
2284 static int do_proc_douintvec_w(unsigned int *tbl_data,
2285                                struct ctl_table *table,
2286                                void __user *buffer,
2287                                size_t *lenp, loff_t *ppos,
2288                                int (*conv)(unsigned long *lvalp,
2289                                            unsigned int *valp,
2290                                            int write, void *data),
2291                                void *data)
2292 {
2293         unsigned long lval;
2294         int err = 0;
2295         size_t left;
2296         bool neg;
2297         char *kbuf = NULL, *p;
2298
2299         left = *lenp;
2300
2301         if (proc_first_pos_non_zero_ignore(ppos, table))
2302                 goto bail_early;
2303
2304         if (left > PAGE_SIZE - 1)
2305                 left = PAGE_SIZE - 1;
2306
2307         p = kbuf = memdup_user_nul(buffer, left);
2308         if (IS_ERR(kbuf))
2309                 return -EINVAL;
2310
2311         left -= proc_skip_spaces(&p);
2312         if (!left) {
2313                 err = -EINVAL;
2314                 goto out_free;
2315         }
2316
2317         err = proc_get_long(&p, &left, &lval, &neg,
2318                              proc_wspace_sep,
2319                              sizeof(proc_wspace_sep), NULL);
2320         if (err || neg) {
2321                 err = -EINVAL;
2322                 goto out_free;
2323         }
2324
2325         if (conv(&lval, tbl_data, 1, data)) {
2326                 err = -EINVAL;
2327                 goto out_free;
2328         }
2329
2330         if (!err && left)
2331                 left -= proc_skip_spaces(&p);
2332
2333 out_free:
2334         kfree(kbuf);
2335         if (err)
2336                 return -EINVAL;
2337
2338         return 0;
2339
2340         /* This is in keeping with old __do_proc_dointvec() */
2341 bail_early:
2342         *ppos += *lenp;
2343         return err;
2344 }
2345
2346 static int do_proc_douintvec_r(unsigned int *tbl_data, void __user *buffer,
2347                                size_t *lenp, loff_t *ppos,
2348                                int (*conv)(unsigned long *lvalp,
2349                                            unsigned int *valp,
2350                                            int write, void *data),
2351                                void *data)
2352 {
2353         unsigned long lval;
2354         int err = 0;
2355         size_t left;
2356
2357         left = *lenp;
2358
2359         if (conv(&lval, tbl_data, 0, data)) {
2360                 err = -EINVAL;
2361                 goto out;
2362         }
2363
2364         err = proc_put_long(&buffer, &left, lval, false);
2365         if (err || !left)
2366                 goto out;
2367
2368         err = proc_put_char(&buffer, &left, '\n');
2369
2370 out:
2371         *lenp -= left;
2372         *ppos += *lenp;
2373
2374         return err;
2375 }
2376
2377 static int __do_proc_douintvec(void *tbl_data, struct ctl_table *table,
2378                                int write, void __user *buffer,
2379                                size_t *lenp, loff_t *ppos,
2380                                int (*conv)(unsigned long *lvalp,
2381                                            unsigned int *valp,
2382                                            int write, void *data),
2383                                void *data)
2384 {
2385         unsigned int *i, vleft;
2386
2387         if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
2388                 *lenp = 0;
2389                 return 0;
2390         }
2391
2392         i = (unsigned int *) tbl_data;
2393         vleft = table->maxlen / sizeof(*i);
2394
2395         /*
2396          * Arrays are not supported, keep this simple. *Do not* add
2397          * support for them.
2398          */
2399         if (vleft != 1) {
2400                 *lenp = 0;
2401                 return -EINVAL;
2402         }
2403
2404         if (!conv)
2405                 conv = do_proc_douintvec_conv;
2406
2407         if (write)
2408                 return do_proc_douintvec_w(i, table, buffer, lenp, ppos,
2409                                            conv, data);
2410         return do_proc_douintvec_r(i, buffer, lenp, ppos, conv, data);
2411 }
2412
2413 static int do_proc_douintvec(struct ctl_table *table, int write,
2414                              void __user *buffer, size_t *lenp, loff_t *ppos,
2415                              int (*conv)(unsigned long *lvalp,
2416                                          unsigned int *valp,
2417                                          int write, void *data),
2418                              void *data)
2419 {
2420         return __do_proc_douintvec(table->data, table, write,
2421                                    buffer, lenp, ppos, conv, data);
2422 }
2423
2424 /**
2425  * proc_dointvec - read a vector of integers
2426  * @table: the sysctl table
2427  * @write: %TRUE if this is a write to the sysctl file
2428  * @buffer: the user buffer
2429  * @lenp: the size of the user buffer
2430  * @ppos: file position
2431  *
2432  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2433  * values from/to the user buffer, treated as an ASCII string. 
2434  *
2435  * Returns 0 on success.
2436  */
2437 int proc_dointvec(struct ctl_table *table, int write,
2438                      void __user *buffer, size_t *lenp, loff_t *ppos)
2439 {
2440         return do_proc_dointvec(table, write, buffer, lenp, ppos, NULL, NULL);
2441 }
2442
2443 /**
2444  * proc_douintvec - read a vector of unsigned integers
2445  * @table: the sysctl table
2446  * @write: %TRUE if this is a write to the sysctl file
2447  * @buffer: the user buffer
2448  * @lenp: the size of the user buffer
2449  * @ppos: file position
2450  *
2451  * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
2452  * values from/to the user buffer, treated as an ASCII string.
2453  *
2454  * Returns 0 on success.
2455  */
2456 int proc_douintvec(struct ctl_table *table, int write,
2457                      void __user *buffer, size_t *lenp, loff_t *ppos)
2458 {
2459         return do_proc_douintvec(table, write, buffer, lenp, ppos,
2460                                  do_proc_douintvec_conv, NULL);
2461 }
2462
2463 /*
2464  * Taint values can only be increased
2465  * This means we can safely use a temporary.
2466  */
2467 static int proc_taint(struct ctl_table *table, int write,
2468                                void __user *buffer, size_t *lenp, loff_t *ppos)
2469 {
2470         struct ctl_table t;
2471         unsigned long tmptaint = get_taint();
2472         int err;
2473
2474         if (write && !capable(CAP_SYS_ADMIN))
2475                 return -EPERM;
2476
2477         t = *table;
2478         t.data = &tmptaint;
2479         err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
2480         if (err < 0)
2481                 return err;
2482
2483         if (write) {
2484                 /*
2485                  * Poor man's atomic or. Not worth adding a primitive
2486                  * to everyone's atomic.h for this
2487                  */
2488                 int i;
2489                 for (i = 0; i < BITS_PER_LONG && tmptaint >> i; i++) {
2490                         if ((tmptaint >> i) & 1)
2491                                 add_taint(i, LOCKDEP_STILL_OK);
2492                 }
2493         }
2494
2495         return err;
2496 }
2497
2498 #ifdef CONFIG_PRINTK
2499 static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
2500                                 void __user *buffer, size_t *lenp, loff_t *ppos)
2501 {
2502         if (write && !capable(CAP_SYS_ADMIN))
2503                 return -EPERM;
2504
2505         return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2506 }
2507 #endif
2508
2509 struct do_proc_dointvec_minmax_conv_param {
2510         int *min;
2511         int *max;
2512 };
2513
2514 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
2515                                         int *valp,
2516                                         int write, void *data)
2517 {
2518         struct do_proc_dointvec_minmax_conv_param *param = data;
2519         if (write) {
2520                 int val = *negp ? -*lvalp : *lvalp;
2521                 if ((param->min && *param->min > val) ||
2522                     (param->max && *param->max < val))
2523                         return -EINVAL;
2524                 *valp = val;
2525         } else {
2526                 int val = *valp;
2527                 if (val < 0) {
2528                         *negp = true;
2529                         *lvalp = -(unsigned long)val;
2530                 } else {
2531                         *negp = false;
2532                         *lvalp = (unsigned long)val;
2533                 }
2534         }
2535         return 0;
2536 }
2537
2538 /**
2539  * proc_dointvec_minmax - read a vector of integers with min/max values
2540  * @table: the sysctl table
2541  * @write: %TRUE if this is a write to the sysctl file
2542  * @buffer: the user buffer
2543  * @lenp: the size of the user buffer
2544  * @ppos: file position
2545  *
2546  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2547  * values from/to the user buffer, treated as an ASCII string.
2548  *
2549  * This routine will ensure the values are within the range specified by
2550  * table->extra1 (min) and table->extra2 (max).
2551  *
2552  * Returns 0 on success.
2553  */
2554 int proc_dointvec_minmax(struct ctl_table *table, int write,
2555                   void __user *buffer, size_t *lenp, loff_t *ppos)
2556 {
2557         struct do_proc_dointvec_minmax_conv_param param = {
2558                 .min = (int *) table->extra1,
2559                 .max = (int *) table->extra2,
2560         };
2561         return do_proc_dointvec(table, write, buffer, lenp, ppos,
2562                                 do_proc_dointvec_minmax_conv, &param);
2563 }
2564
2565 struct do_proc_douintvec_minmax_conv_param {
2566         unsigned int *min;
2567         unsigned int *max;
2568 };
2569
2570 static int do_proc_douintvec_minmax_conv(unsigned long *lvalp,
2571                                          unsigned int *valp,
2572                                          int write, void *data)
2573 {
2574         struct do_proc_douintvec_minmax_conv_param *param = data;
2575
2576         if (write) {
2577                 unsigned int val = *lvalp;
2578
2579                 if (*lvalp > UINT_MAX)
2580                         return -EINVAL;
2581
2582                 if ((param->min && *param->min > val) ||
2583                     (param->max && *param->max < val))
2584                         return -ERANGE;
2585
2586                 *valp = val;
2587         } else {
2588                 unsigned int val = *valp;
2589                 *lvalp = (unsigned long) val;
2590         }
2591
2592         return 0;
2593 }
2594
2595 /**
2596  * proc_douintvec_minmax - read a vector of unsigned ints with min/max values
2597  * @table: the sysctl table
2598  * @write: %TRUE if this is a write to the sysctl file
2599  * @buffer: the user buffer
2600  * @lenp: the size of the user buffer
2601  * @ppos: file position
2602  *
2603  * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
2604  * values from/to the user buffer, treated as an ASCII string. Negative
2605  * strings are not allowed.
2606  *
2607  * This routine will ensure the values are within the range specified by
2608  * table->extra1 (min) and table->extra2 (max). There is a final sanity
2609  * check for UINT_MAX to avoid having to support wrap around uses from
2610  * userspace.
2611  *
2612  * Returns 0 on success.
2613  */
2614 int proc_douintvec_minmax(struct ctl_table *table, int write,
2615                           void __user *buffer, size_t *lenp, loff_t *ppos)
2616 {
2617         struct do_proc_douintvec_minmax_conv_param param = {
2618                 .min = (unsigned int *) table->extra1,
2619                 .max = (unsigned int *) table->extra2,
2620         };
2621         return do_proc_douintvec(table, write, buffer, lenp, ppos,
2622                                  do_proc_douintvec_minmax_conv, &param);
2623 }
2624
2625 struct do_proc_dopipe_max_size_conv_param {
2626         unsigned int *min;
2627 };
2628
2629 static int do_proc_dopipe_max_size_conv(unsigned long *lvalp,
2630                                         unsigned int *valp,
2631                                         int write, void *data)
2632 {
2633         struct do_proc_dopipe_max_size_conv_param *param = data;
2634
2635         if (write) {
2636                 unsigned int val;
2637
2638                 if (*lvalp > UINT_MAX)
2639                         return -EINVAL;
2640
2641                 val = round_pipe_size(*lvalp);
2642                 if (val == 0)
2643                         return -EINVAL;
2644
2645                 if (param->min && *param->min > val)
2646                         return -ERANGE;
2647
2648                 *valp = val;
2649         } else {
2650                 unsigned int val = *valp;
2651                 *lvalp = (unsigned long) val;
2652         }
2653
2654         return 0;
2655 }
2656
2657 int proc_dopipe_max_size(struct ctl_table *table, int write,
2658                          void __user *buffer, size_t *lenp, loff_t *ppos)
2659 {
2660         struct do_proc_dopipe_max_size_conv_param param = {
2661                 .min = (unsigned int *) table->extra1,
2662         };
2663         return do_proc_douintvec(table, write, buffer, lenp, ppos,
2664                                  do_proc_dopipe_max_size_conv, &param);
2665 }
2666
2667 static void validate_coredump_safety(void)
2668 {
2669 #ifdef CONFIG_COREDUMP
2670         if (suid_dumpable == SUID_DUMP_ROOT &&
2671             core_pattern[0] != '/' && core_pattern[0] != '|') {
2672                 printk(KERN_WARNING
2673 "Unsafe core_pattern used with fs.suid_dumpable=2.\n"
2674 "Pipe handler or fully qualified core dump path required.\n"
2675 "Set kernel.core_pattern before fs.suid_dumpable.\n"
2676                 );
2677         }
2678 #endif
2679 }
2680
2681 static int proc_dointvec_minmax_coredump(struct ctl_table *table, int write,
2682                 void __user *buffer, size_t *lenp, loff_t *ppos)
2683 {
2684         int error = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
2685         if (!error)
2686                 validate_coredump_safety();
2687         return error;
2688 }
2689
2690 #ifdef CONFIG_COREDUMP
2691 static int proc_dostring_coredump(struct ctl_table *table, int write,
2692                   void __user *buffer, size_t *lenp, loff_t *ppos)
2693 {
2694         int error = proc_dostring(table, write, buffer, lenp, ppos);
2695         if (!error)
2696                 validate_coredump_safety();
2697         return error;
2698 }
2699 #endif
2700
2701 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int write,
2702                                      void __user *buffer,
2703                                      size_t *lenp, loff_t *ppos,
2704                                      unsigned long convmul,
2705                                      unsigned long convdiv)
2706 {
2707         unsigned long *i, *min, *max;
2708         int vleft, first = 1, err = 0;
2709         size_t left;
2710         char *kbuf = NULL, *p;
2711
2712         if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
2713                 *lenp = 0;
2714                 return 0;
2715         }
2716
2717         i = (unsigned long *) data;
2718         min = (unsigned long *) table->extra1;
2719         max = (unsigned long *) table->extra2;
2720         vleft = table->maxlen / sizeof(unsigned long);
2721         left = *lenp;
2722
2723         if (write) {
2724                 if (proc_first_pos_non_zero_ignore(ppos, table))
2725                         goto out;
2726
2727                 if (left > PAGE_SIZE - 1)
2728                         left = PAGE_SIZE - 1;
2729                 p = kbuf = memdup_user_nul(buffer, left);
2730                 if (IS_ERR(kbuf))
2731                         return PTR_ERR(kbuf);
2732         }
2733
2734         for (; left && vleft--; i++, first = 0) {
2735                 unsigned long val;
2736
2737                 if (write) {
2738                         bool neg;
2739
2740                         left -= proc_skip_spaces(&p);
2741
2742                         err = proc_get_long(&p, &left, &val, &neg,
2743                                              proc_wspace_sep,
2744                                              sizeof(proc_wspace_sep), NULL);
2745                         if (err)
2746                                 break;
2747                         if (neg)
2748                                 continue;
2749                         val = convmul * val / convdiv;
2750                         if ((min && val < *min) || (max && val > *max))
2751                                 continue;
2752                         *i = val;
2753                 } else {
2754                         val = convdiv * (*i) / convmul;
2755                         if (!first) {
2756                                 err = proc_put_char(&buffer, &left, '\t');
2757                                 if (err)
2758                                         break;
2759                         }
2760                         err = proc_put_long(&buffer, &left, val, false);
2761                         if (err)
2762                                 break;
2763                 }
2764         }
2765
2766         if (!write && !first && left && !err)
2767                 err = proc_put_char(&buffer, &left, '\n');
2768         if (write && !err)
2769                 left -= proc_skip_spaces(&p);
2770         if (write) {
2771                 kfree(kbuf);
2772                 if (first)
2773                         return err ? : -EINVAL;
2774         }
2775         *lenp -= left;
2776 out:
2777         *ppos += *lenp;
2778         return err;
2779 }
2780
2781 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
2782                                      void __user *buffer,
2783                                      size_t *lenp, loff_t *ppos,
2784                                      unsigned long convmul,
2785                                      unsigned long convdiv)
2786 {
2787         return __do_proc_doulongvec_minmax(table->data, table, write,
2788                         buffer, lenp, ppos, convmul, convdiv);
2789 }
2790
2791 /**
2792  * proc_doulongvec_minmax - read a vector of long integers with min/max values
2793  * @table: the sysctl table
2794  * @write: %TRUE if this is a write to the sysctl file
2795  * @buffer: the user buffer
2796  * @lenp: the size of the user buffer
2797  * @ppos: file position
2798  *
2799  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2800  * values from/to the user buffer, treated as an ASCII string.
2801  *
2802  * This routine will ensure the values are within the range specified by
2803  * table->extra1 (min) and table->extra2 (max).
2804  *
2805  * Returns 0 on success.
2806  */
2807 int proc_doulongvec_minmax(struct ctl_table *table, int write,
2808                            void __user *buffer, size_t *lenp, loff_t *ppos)
2809 {
2810     return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
2811 }
2812
2813 /**
2814  * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
2815  * @table: the sysctl table
2816  * @write: %TRUE if this is a write to the sysctl file
2817  * @buffer: the user buffer
2818  * @lenp: the size of the user buffer
2819  * @ppos: file position
2820  *
2821  * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
2822  * values from/to the user buffer, treated as an ASCII string. The values
2823  * are treated as milliseconds, and converted to jiffies when they are stored.
2824  *
2825  * This routine will ensure the values are within the range specified by
2826  * table->extra1 (min) and table->extra2 (max).
2827  *
2828  * Returns 0 on success.
2829  */
2830 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
2831                                       void __user *buffer,
2832                                       size_t *lenp, loff_t *ppos)
2833 {
2834     return do_proc_doulongvec_minmax(table, write, buffer,
2835                                      lenp, ppos, HZ, 1000l);
2836 }
2837
2838
2839 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
2840                                          int *valp,
2841                                          int write, void *data)
2842 {
2843         if (write) {
2844                 if (*lvalp > INT_MAX / HZ)
2845                         return 1;
2846                 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
2847         } else {
2848                 int val = *valp;
2849                 unsigned long lval;
2850                 if (val < 0) {
2851                         *negp = true;
2852                         lval = -(unsigned long)val;
2853                 } else {
2854                         *negp = false;
2855                         lval = (unsigned long)val;
2856                 }
2857                 *lvalp = lval / HZ;
2858         }
2859         return 0;
2860 }
2861
2862 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
2863                                                 int *valp,
2864                                                 int write, void *data)
2865 {
2866         if (write) {
2867                 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
2868                         return 1;
2869                 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
2870         } else {
2871                 int val = *valp;
2872                 unsigned long lval;
2873                 if (val < 0) {
2874                         *negp = true;
2875                         lval = -(unsigned long)val;
2876                 } else {
2877                         *negp = false;
2878                         lval = (unsigned long)val;
2879                 }
2880                 *lvalp = jiffies_to_clock_t(lval);
2881         }
2882         return 0;
2883 }
2884
2885 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
2886                                             int *valp,
2887                                             int write, void *data)
2888 {
2889         if (write) {
2890                 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
2891
2892                 if (jif > INT_MAX)
2893                         return 1;
2894                 *valp = (int)jif;
2895         } else {
2896                 int val = *valp;
2897                 unsigned long lval;
2898                 if (val < 0) {
2899                         *negp = true;
2900                         lval = -(unsigned long)val;
2901                 } else {
2902                         *negp = false;
2903                         lval = (unsigned long)val;
2904                 }
2905                 *lvalp = jiffies_to_msecs(lval);
2906         }
2907         return 0;
2908 }
2909
2910 /**
2911  * proc_dointvec_jiffies - read a vector of integers as seconds
2912  * @table: the sysctl table
2913  * @write: %TRUE if this is a write to the sysctl file
2914  * @buffer: the user buffer
2915  * @lenp: the size of the user buffer
2916  * @ppos: file position
2917  *
2918  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2919  * values from/to the user buffer, treated as an ASCII string. 
2920  * The values read are assumed to be in seconds, and are converted into
2921  * jiffies.
2922  *
2923  * Returns 0 on success.
2924  */
2925 int proc_dointvec_jiffies(struct ctl_table *table, int write,
2926                           void __user *buffer, size_t *lenp, loff_t *ppos)
2927 {
2928     return do_proc_dointvec(table,write,buffer,lenp,ppos,
2929                             do_proc_dointvec_jiffies_conv,NULL);
2930 }
2931
2932 /**
2933  * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
2934  * @table: the sysctl table
2935  * @write: %TRUE if this is a write to the sysctl file
2936  * @buffer: the user buffer
2937  * @lenp: the size of the user buffer
2938  * @ppos: pointer to the file position
2939  *
2940  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2941  * values from/to the user buffer, treated as an ASCII string. 
2942  * The values read are assumed to be in 1/USER_HZ seconds, and 
2943  * are converted into jiffies.
2944  *
2945  * Returns 0 on success.
2946  */
2947 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
2948                                  void __user *buffer, size_t *lenp, loff_t *ppos)
2949 {
2950     return do_proc_dointvec(table,write,buffer,lenp,ppos,
2951                             do_proc_dointvec_userhz_jiffies_conv,NULL);
2952 }
2953
2954 /**
2955  * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
2956  * @table: the sysctl table
2957  * @write: %TRUE if this is a write to the sysctl file
2958  * @buffer: the user buffer
2959  * @lenp: the size of the user buffer
2960  * @ppos: file position
2961  * @ppos: the current position in the file
2962  *
2963  * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
2964  * values from/to the user buffer, treated as an ASCII string. 
2965  * The values read are assumed to be in 1/1000 seconds, and 
2966  * are converted into jiffies.
2967  *
2968  * Returns 0 on success.
2969  */
2970 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
2971                              void __user *buffer, size_t *lenp, loff_t *ppos)
2972 {
2973         return do_proc_dointvec(table, write, buffer, lenp, ppos,
2974                                 do_proc_dointvec_ms_jiffies_conv, NULL);
2975 }
2976
2977 static int proc_do_cad_pid(struct ctl_table *table, int write,
2978                            void __user *buffer, size_t *lenp, loff_t *ppos)
2979 {
2980         struct pid *new_pid;
2981         pid_t tmp;
2982         int r;
2983
2984         tmp = pid_vnr(cad_pid);
2985
2986         r = __do_proc_dointvec(&tmp, table, write, buffer,
2987                                lenp, ppos, NULL, NULL);
2988         if (r || !write)
2989                 return r;
2990
2991         new_pid = find_get_pid(tmp);
2992         if (!new_pid)
2993                 return -ESRCH;
2994
2995         put_pid(xchg(&cad_pid, new_pid));
2996         return 0;
2997 }
2998
2999 /**
3000  * proc_do_large_bitmap - read/write from/to a large bitmap
3001  * @table: the sysctl table
3002  * @write: %TRUE if this is a write to the sysctl file
3003  * @buffer: the user buffer
3004  * @lenp: the size of the user buffer
3005  * @ppos: file position
3006  *
3007  * The bitmap is stored at table->data and the bitmap length (in bits)
3008  * in table->maxlen.
3009  *
3010  * We use a range comma separated format (e.g. 1,3-4,10-10) so that
3011  * large bitmaps may be represented in a compact manner. Writing into
3012  * the file will clear the bitmap then update it with the given input.
3013  *
3014  * Returns 0 on success.
3015  */
3016 int proc_do_large_bitmap(struct ctl_table *table, int write,
3017                          void __user *buffer, size_t *lenp, loff_t *ppos)
3018 {
3019         int err = 0;
3020         bool first = 1;
3021         size_t left = *lenp;
3022         unsigned long bitmap_len = table->maxlen;
3023         unsigned long *bitmap = *(unsigned long **) table->data;
3024         unsigned long *tmp_bitmap = NULL;
3025         char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
3026
3027         if (!bitmap || !bitmap_len || !left || (*ppos && !write)) {
3028                 *lenp = 0;
3029                 return 0;
3030         }
3031
3032         if (write) {
3033                 char *kbuf, *p;
3034
3035                 if (left > PAGE_SIZE - 1)
3036                         left = PAGE_SIZE - 1;
3037
3038                 p = kbuf = memdup_user_nul(buffer, left);
3039                 if (IS_ERR(kbuf))
3040                         return PTR_ERR(kbuf);
3041
3042                 tmp_bitmap = kzalloc(BITS_TO_LONGS(bitmap_len) * sizeof(unsigned long),
3043                                      GFP_KERNEL);
3044                 if (!tmp_bitmap) {
3045                         kfree(kbuf);
3046                         return -ENOMEM;
3047                 }
3048                 proc_skip_char(&p, &left, '\n');
3049                 while (!err && left) {
3050                         unsigned long val_a, val_b;
3051                         bool neg;
3052
3053                         err = proc_get_long(&p, &left, &val_a, &neg, tr_a,
3054                                              sizeof(tr_a), &c);
3055                         if (err)
3056                                 break;
3057                         if (val_a >= bitmap_len || neg) {
3058                                 err = -EINVAL;
3059                                 break;
3060                         }
3061
3062                         val_b = val_a;
3063                         if (left) {
3064                                 p++;
3065                                 left--;
3066                         }
3067
3068                         if (c == '-') {
3069                                 err = proc_get_long(&p, &left, &val_b,
3070                                                      &neg, tr_b, sizeof(tr_b),
3071                                                      &c);
3072                                 if (err)
3073                                         break;
3074                                 if (val_b >= bitmap_len || neg ||
3075                                     val_a > val_b) {
3076                                         err = -EINVAL;
3077                                         break;
3078                                 }
3079                                 if (left) {
3080                                         p++;
3081                                         left--;
3082                                 }
3083                         }
3084
3085                         bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
3086                         first = 0;
3087                         proc_skip_char(&p, &left, '\n');
3088                 }
3089                 kfree(kbuf);
3090         } else {
3091                 unsigned long bit_a, bit_b = 0;
3092
3093                 while (left) {
3094                         bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
3095                         if (bit_a >= bitmap_len)
3096                                 break;
3097                         bit_b = find_next_zero_bit(bitmap, bitmap_len,
3098                                                    bit_a + 1) - 1;
3099
3100                         if (!first) {
3101                                 err = proc_put_char(&buffer, &left, ',');
3102                                 if (err)
3103                                         break;
3104                         }
3105                         err = proc_put_long(&buffer, &left, bit_a, false);
3106                         if (err)
3107                                 break;
3108                         if (bit_a != bit_b) {
3109                                 err = proc_put_char(&buffer, &left, '-');
3110                                 if (err)
3111                                         break;
3112                                 err = proc_put_long(&buffer, &left, bit_b, false);
3113                                 if (err)
3114                                         break;
3115                         }
3116
3117                         first = 0; bit_b++;
3118                 }
3119                 if (!err)
3120                         err = proc_put_char(&buffer, &left, '\n');
3121         }
3122
3123         if (!err) {
3124                 if (write) {
3125                         if (*ppos)
3126                                 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
3127                         else
3128                                 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
3129                 }
3130                 *lenp -= left;
3131                 *ppos += *lenp;