1 // SPDX-License-Identifier: GPL-2.0-only
3 * sysctl.c: General linux system control interface
5 * Begun 24 March 1995, Stephen Tweedie
6 * Added /proc support, Dec 1995
7 * Added bdflush entry and intvec min/max checking, 2/23/96, Tom Dyas.
8 * Added hooks for /proc/sys/net (minor, minor patch), 96/4/1, Mike Shaver.
9 * Added kernel/java-{interpreter,appletviewer}, 96/5/10, Mike Shaver.
10 * Dynamic registration fixes, Stephen Tweedie.
11 * Added kswapd-interval, ctrl-alt-del, printk stuff, 1/8/97, Chris Horn.
12 * Made sysctl support optional via CONFIG_SYSCTL, 1/10/97, Chris
14 * Added proc_doulongvec_ms_jiffies_minmax, 09/08/99, Carlos H. Bauer.
15 * Added proc_doulongvec_minmax, 09/08/99, Carlos H. Bauer.
16 * Changed linked lists to use list.h instead of lists.h, 02/24/00, Bill
18 * The list_for_each() macro wasn't appropriate for the sysctl loop.
19 * Removed it and replaced it with older style, 03/23/00, Bill Wendling
22 #include <linux/module.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/panic.h>
30 #include <linux/printk.h>
31 #include <linux/proc_fs.h>
32 #include <linux/security.h>
33 #include <linux/ctype.h>
34 #include <linux/kmemleak.h>
35 #include <linux/filter.h>
37 #include <linux/init.h>
38 #include <linux/kernel.h>
39 #include <linux/kobject.h>
40 #include <linux/net.h>
41 #include <linux/sysrq.h>
42 #include <linux/highuid.h>
43 #include <linux/writeback.h>
44 #include <linux/ratelimit.h>
45 #include <linux/compaction.h>
46 #include <linux/hugetlb.h>
47 #include <linux/initrd.h>
48 #include <linux/key.h>
49 #include <linux/times.h>
50 #include <linux/limits.h>
51 #include <linux/dcache.h>
52 #include <linux/syscalls.h>
53 #include <linux/vmstat.h>
54 #include <linux/nfs_fs.h>
55 #include <linux/acpi.h>
56 #include <linux/reboot.h>
57 #include <linux/ftrace.h>
58 #include <linux/perf_event.h>
59 #include <linux/oom.h>
60 #include <linux/kmod.h>
61 #include <linux/capability.h>
62 #include <linux/binfmts.h>
63 #include <linux/sched/sysctl.h>
64 #include <linux/kexec.h>
65 #include <linux/bpf.h>
66 #include <linux/mount.h>
67 #include <linux/userfaultfd_k.h>
68 #include <linux/latencytop.h>
69 #include <linux/pid.h>
70 #include <linux/delayacct.h>
72 #include "../lib/kstrtox.h"
74 #include <linux/uaccess.h>
75 #include <asm/processor.h>
79 #include <asm/stacktrace.h>
83 #include <asm/setup.h>
85 #ifdef CONFIG_BSD_PROCESS_ACCT
86 #include <linux/acct.h>
88 #ifdef CONFIG_RT_MUTEXES
89 #include <linux/rtmutex.h>
91 #if defined(CONFIG_PROVE_LOCKING) || defined(CONFIG_LOCK_STAT)
92 #include <linux/lockdep.h>
95 #if defined(CONFIG_SYSCTL)
97 /* Constants used for minimum and maximum */
99 #ifdef CONFIG_PERF_EVENTS
100 static const int six_hundred_forty_kb = 640 * 1024;
103 /* this is needed for the proc_doulongvec_minmax of vm_dirty_bytes */
104 static const unsigned long dirty_bytes_min = 2 * PAGE_SIZE;
106 static const int ngroups_max = NGROUPS_MAX;
107 static const int cap_last_cap = CAP_LAST_CAP;
109 #ifdef CONFIG_PROC_SYSCTL
112 * enum sysctl_writes_mode - supported sysctl write modes
114 * @SYSCTL_WRITES_LEGACY: each write syscall must fully contain the sysctl value
115 * to be written, and multiple writes on the same sysctl file descriptor
116 * will rewrite the sysctl value, regardless of file position. No warning
117 * is issued when the initial position is not 0.
118 * @SYSCTL_WRITES_WARN: same as above but warn when the initial file position is
120 * @SYSCTL_WRITES_STRICT: writes to numeric sysctl entries must always be at
121 * file position 0 and the value must be fully contained in the buffer
122 * sent to the write syscall. If dealing with strings respect the file
123 * position, but restrict this to the max length of the buffer, anything
124 * passed the max length will be ignored. Multiple writes will append
127 * These write modes control how current file position affects the behavior of
128 * updating sysctl values through the proc interface on each write.
130 enum sysctl_writes_mode {
131 SYSCTL_WRITES_LEGACY = -1,
132 SYSCTL_WRITES_WARN = 0,
133 SYSCTL_WRITES_STRICT = 1,
136 static enum sysctl_writes_mode sysctl_writes_strict = SYSCTL_WRITES_STRICT;
137 #endif /* CONFIG_PROC_SYSCTL */
139 #if defined(HAVE_ARCH_PICK_MMAP_LAYOUT) || \
140 defined(CONFIG_ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT)
141 int sysctl_legacy_va_layout;
144 #ifdef CONFIG_COMPACTION
145 /* min_extfrag_threshold is SYSCTL_ZERO */;
146 static const int max_extfrag_threshold = 1000;
149 #endif /* CONFIG_SYSCTL */
151 #if defined(CONFIG_BPF_SYSCALL) && defined(CONFIG_SYSCTL)
152 static int bpf_stats_handler(struct ctl_table *table, int write,
153 void *buffer, size_t *lenp, loff_t *ppos)
155 struct static_key *key = (struct static_key *)table->data;
156 static int saved_val;
158 struct ctl_table tmp = {
160 .maxlen = sizeof(val),
162 .extra1 = SYSCTL_ZERO,
163 .extra2 = SYSCTL_ONE,
166 if (write && !capable(CAP_SYS_ADMIN))
169 mutex_lock(&bpf_stats_enabled_mutex);
171 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
172 if (write && !ret && val != saved_val) {
174 static_key_slow_inc(key);
176 static_key_slow_dec(key);
179 mutex_unlock(&bpf_stats_enabled_mutex);
183 void __weak unpriv_ebpf_notify(int new_state)
187 static int bpf_unpriv_handler(struct ctl_table *table, int write,
188 void *buffer, size_t *lenp, loff_t *ppos)
190 int ret, unpriv_enable = *(int *)table->data;
191 bool locked_state = unpriv_enable == 1;
192 struct ctl_table tmp = *table;
194 if (write && !capable(CAP_SYS_ADMIN))
197 tmp.data = &unpriv_enable;
198 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
200 if (locked_state && unpriv_enable != 1)
202 *(int *)table->data = unpriv_enable;
205 unpriv_ebpf_notify(unpriv_enable);
209 #endif /* CONFIG_BPF_SYSCALL && CONFIG_SYSCTL */
215 #ifdef CONFIG_PROC_SYSCTL
217 static int _proc_do_string(char *data, int maxlen, int write,
218 char *buffer, size_t *lenp, loff_t *ppos)
223 if (!data || !maxlen || !*lenp) {
229 if (sysctl_writes_strict == SYSCTL_WRITES_STRICT) {
230 /* Only continue writes not past the end of buffer. */
232 if (len > maxlen - 1)
239 /* Start writing from beginning of buffer. */
245 while ((p - buffer) < *lenp && len < maxlen - 1) {
247 if (c == 0 || c == '\n')
268 memcpy(buffer, data, len);
279 static void warn_sysctl_write(struct ctl_table *table)
281 pr_warn_once("%s wrote to %s when file position was not 0!\n"
282 "This will not be supported in the future. To silence this\n"
283 "warning, set kernel.sysctl_writes_strict = -1\n",
284 current->comm, table->procname);
288 * proc_first_pos_non_zero_ignore - check if first position is allowed
289 * @ppos: file position
290 * @table: the sysctl table
292 * Returns true if the first position is non-zero and the sysctl_writes_strict
293 * mode indicates this is not allowed for numeric input types. String proc
294 * handlers can ignore the return value.
296 static bool proc_first_pos_non_zero_ignore(loff_t *ppos,
297 struct ctl_table *table)
302 switch (sysctl_writes_strict) {
303 case SYSCTL_WRITES_STRICT:
305 case SYSCTL_WRITES_WARN:
306 warn_sysctl_write(table);
314 * proc_dostring - read a string sysctl
315 * @table: the sysctl table
316 * @write: %TRUE if this is a write to the sysctl file
317 * @buffer: the user buffer
318 * @lenp: the size of the user buffer
319 * @ppos: file position
321 * Reads/writes a string from/to the user buffer. If the kernel
322 * buffer provided is not large enough to hold the string, the
323 * string is truncated. The copied string is %NULL-terminated.
324 * If the string is being read by the user process, it is copied
325 * and a newline '\n' is added. It is truncated if the buffer is
328 * Returns 0 on success.
330 int proc_dostring(struct ctl_table *table, int write,
331 void *buffer, size_t *lenp, loff_t *ppos)
334 proc_first_pos_non_zero_ignore(ppos, table);
336 return _proc_do_string(table->data, table->maxlen, write, buffer, lenp,
340 static size_t proc_skip_spaces(char **buf)
343 char *tmp = skip_spaces(*buf);
349 static void proc_skip_char(char **buf, size_t *size, const char v)
360 * strtoul_lenient - parse an ASCII formatted integer from a buffer and only
363 * @cp: kernel buffer containing the string to parse
364 * @endp: pointer to store the trailing characters
365 * @base: the base to use
366 * @res: where the parsed integer will be stored
368 * In case of success 0 is returned and @res will contain the parsed integer,
369 * @endp will hold any trailing characters.
370 * This function will fail the parse on overflow. If there wasn't an overflow
371 * the function will defer the decision what characters count as invalid to the
374 static int strtoul_lenient(const char *cp, char **endp, unsigned int base,
377 unsigned long long result;
380 cp = _parse_integer_fixup_radix(cp, &base);
381 rv = _parse_integer(cp, base, &result);
382 if ((rv & KSTRTOX_OVERFLOW) || (result != (unsigned long)result))
390 *res = (unsigned long)result;
396 * proc_get_long - reads an ASCII formatted integer from a user buffer
398 * @buf: a kernel buffer
399 * @size: size of the kernel buffer
400 * @val: this is where the number will be stored
401 * @neg: set to %TRUE if number is negative
402 * @perm_tr: a vector which contains the allowed trailers
403 * @perm_tr_len: size of the perm_tr vector
404 * @tr: pointer to store the trailer character
406 * In case of success %0 is returned and @buf and @size are updated with
407 * the amount of bytes read. If @tr is non-NULL and a trailing
408 * character exists (size is non-zero after returning from this
409 * function), @tr is updated with the trailing character.
411 static int proc_get_long(char **buf, size_t *size,
412 unsigned long *val, bool *neg,
413 const char *perm_tr, unsigned perm_tr_len, char *tr)
416 char *p, tmp[TMPBUFLEN];
422 if (len > TMPBUFLEN - 1)
425 memcpy(tmp, *buf, len);
429 if (*p == '-' && *size > 1) {
437 if (strtoul_lenient(p, &p, 0, val))
442 /* We don't know if the next char is whitespace thus we may accept
443 * invalid integers (e.g. 1234...a) or two integers instead of one
444 * (e.g. 123...1). So lets not allow such large numbers. */
445 if (len == TMPBUFLEN - 1)
448 if (len < *size && perm_tr_len && !memchr(perm_tr, *p, perm_tr_len))
451 if (tr && (len < *size))
461 * proc_put_long - converts an integer to a decimal ASCII formatted string
463 * @buf: the user buffer
464 * @size: the size of the user buffer
465 * @val: the integer to be converted
466 * @neg: sign of the number, %TRUE for negative
468 * In case of success @buf and @size are updated with the amount of bytes
471 static void proc_put_long(void **buf, size_t *size, unsigned long val, bool neg)
474 char tmp[TMPBUFLEN], *p = tmp;
476 sprintf(p, "%s%lu", neg ? "-" : "", val);
480 memcpy(*buf, tmp, len);
486 static void proc_put_char(void **buf, size_t *size, char c)
489 char **buffer = (char **)buf;
498 static int do_proc_dobool_conv(bool *negp, unsigned long *lvalp,
500 int write, void *data)
503 *(bool *)valp = *lvalp;
505 int val = *(bool *)valp;
507 *lvalp = (unsigned long)val;
513 static int do_proc_dointvec_conv(bool *negp, unsigned long *lvalp,
515 int write, void *data)
519 if (*lvalp > (unsigned long) INT_MAX + 1)
523 if (*lvalp > (unsigned long) INT_MAX)
531 *lvalp = -(unsigned long)val;
534 *lvalp = (unsigned long)val;
540 static int do_proc_douintvec_conv(unsigned long *lvalp,
542 int write, void *data)
545 if (*lvalp > UINT_MAX)
549 unsigned int val = *valp;
550 *lvalp = (unsigned long)val;
555 static const char proc_wspace_sep[] = { ' ', '\t', '\n' };
557 static int __do_proc_dointvec(void *tbl_data, struct ctl_table *table,
558 int write, void *buffer,
559 size_t *lenp, loff_t *ppos,
560 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
561 int write, void *data),
564 int *i, vleft, first = 1, err = 0;
568 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
573 i = (int *) tbl_data;
574 vleft = table->maxlen / sizeof(*i);
578 conv = do_proc_dointvec_conv;
581 if (proc_first_pos_non_zero_ignore(ppos, table))
584 if (left > PAGE_SIZE - 1)
585 left = PAGE_SIZE - 1;
589 for (; left && vleft--; i++, first=0) {
594 left -= proc_skip_spaces(&p);
598 err = proc_get_long(&p, &left, &lval, &neg,
600 sizeof(proc_wspace_sep), NULL);
603 if (conv(&neg, &lval, i, 1, data)) {
608 if (conv(&neg, &lval, i, 0, data)) {
613 proc_put_char(&buffer, &left, '\t');
614 proc_put_long(&buffer, &left, lval, neg);
618 if (!write && !first && left && !err)
619 proc_put_char(&buffer, &left, '\n');
620 if (write && !err && left)
621 left -= proc_skip_spaces(&p);
623 return err ? : -EINVAL;
630 static int do_proc_dointvec(struct ctl_table *table, int write,
631 void *buffer, size_t *lenp, loff_t *ppos,
632 int (*conv)(bool *negp, unsigned long *lvalp, int *valp,
633 int write, void *data),
636 return __do_proc_dointvec(table->data, table, write,
637 buffer, lenp, ppos, conv, data);
640 static int do_proc_douintvec_w(unsigned int *tbl_data,
641 struct ctl_table *table,
643 size_t *lenp, loff_t *ppos,
644 int (*conv)(unsigned long *lvalp,
646 int write, void *data),
657 if (proc_first_pos_non_zero_ignore(ppos, table))
660 if (left > PAGE_SIZE - 1)
661 left = PAGE_SIZE - 1;
663 left -= proc_skip_spaces(&p);
669 err = proc_get_long(&p, &left, &lval, &neg,
671 sizeof(proc_wspace_sep), NULL);
677 if (conv(&lval, tbl_data, 1, data)) {
683 left -= proc_skip_spaces(&p);
691 /* This is in keeping with old __do_proc_dointvec() */
697 static int do_proc_douintvec_r(unsigned int *tbl_data, void *buffer,
698 size_t *lenp, loff_t *ppos,
699 int (*conv)(unsigned long *lvalp,
701 int write, void *data),
710 if (conv(&lval, tbl_data, 0, data)) {
715 proc_put_long(&buffer, &left, lval, false);
719 proc_put_char(&buffer, &left, '\n');
728 static int __do_proc_douintvec(void *tbl_data, struct ctl_table *table,
729 int write, void *buffer,
730 size_t *lenp, loff_t *ppos,
731 int (*conv)(unsigned long *lvalp,
733 int write, void *data),
736 unsigned int *i, vleft;
738 if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {
743 i = (unsigned int *) tbl_data;
744 vleft = table->maxlen / sizeof(*i);
747 * Arrays are not supported, keep this simple. *Do not* add
756 conv = do_proc_douintvec_conv;
759 return do_proc_douintvec_w(i, table, buffer, lenp, ppos,
761 return do_proc_douintvec_r(i, buffer, lenp, ppos, conv, data);
764 int do_proc_douintvec(struct ctl_table *table, int write,
765 void *buffer, size_t *lenp, loff_t *ppos,
766 int (*conv)(unsigned long *lvalp,
768 int write, void *data),
771 return __do_proc_douintvec(table->data, table, write,
772 buffer, lenp, ppos, conv, data);
776 * proc_dobool - read/write a bool
777 * @table: the sysctl table
778 * @write: %TRUE if this is a write to the sysctl file
779 * @buffer: the user buffer
780 * @lenp: the size of the user buffer
781 * @ppos: file position
783 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
784 * values from/to the user buffer, treated as an ASCII string.
786 * Returns 0 on success.
788 int proc_dobool(struct ctl_table *table, int write, void *buffer,
789 size_t *lenp, loff_t *ppos)
791 return do_proc_dointvec(table, write, buffer, lenp, ppos,
792 do_proc_dobool_conv, NULL);
796 * proc_dointvec - read a vector of integers
797 * @table: the sysctl table
798 * @write: %TRUE if this is a write to the sysctl file
799 * @buffer: the user buffer
800 * @lenp: the size of the user buffer
801 * @ppos: file position
803 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
804 * values from/to the user buffer, treated as an ASCII string.
806 * Returns 0 on success.
808 int proc_dointvec(struct ctl_table *table, int write, void *buffer,
809 size_t *lenp, loff_t *ppos)
811 return do_proc_dointvec(table, write, buffer, lenp, ppos, NULL, NULL);
814 #ifdef CONFIG_COMPACTION
815 static int proc_dointvec_minmax_warn_RT_change(struct ctl_table *table,
816 int write, void *buffer, size_t *lenp, loff_t *ppos)
820 if (!IS_ENABLED(CONFIG_PREEMPT_RT) || !write)
821 return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
823 old = *(int *)table->data;
824 ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
827 if (old != *(int *)table->data)
828 pr_warn_once("sysctl attribute %s changed by %s[%d]\n",
829 table->procname, current->comm,
830 task_pid_nr(current));
836 * proc_douintvec - read a vector of unsigned integers
837 * @table: the sysctl table
838 * @write: %TRUE if this is a write to the sysctl file
839 * @buffer: the user buffer
840 * @lenp: the size of the user buffer
841 * @ppos: file position
843 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
844 * values from/to the user buffer, treated as an ASCII string.
846 * Returns 0 on success.
848 int proc_douintvec(struct ctl_table *table, int write, void *buffer,
849 size_t *lenp, loff_t *ppos)
851 return do_proc_douintvec(table, write, buffer, lenp, ppos,
852 do_proc_douintvec_conv, NULL);
856 * Taint values can only be increased
857 * This means we can safely use a temporary.
859 static int proc_taint(struct ctl_table *table, int write,
860 void *buffer, size_t *lenp, loff_t *ppos)
863 unsigned long tmptaint = get_taint();
866 if (write && !capable(CAP_SYS_ADMIN))
871 err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);
879 * If we are relying on panic_on_taint not producing
880 * false positives due to userspace input, bail out
881 * before setting the requested taint flags.
883 if (panic_on_taint_nousertaint && (tmptaint & panic_on_taint))
887 * Poor man's atomic or. Not worth adding a primitive
888 * to everyone's atomic.h for this
890 for (i = 0; i < TAINT_FLAGS_COUNT; i++)
891 if ((1UL << i) & tmptaint)
892 add_taint(i, LOCKDEP_STILL_OK);
899 * struct do_proc_dointvec_minmax_conv_param - proc_dointvec_minmax() range checking structure
900 * @min: pointer to minimum allowable value
901 * @max: pointer to maximum allowable value
903 * The do_proc_dointvec_minmax_conv_param structure provides the
904 * minimum and maximum values for doing range checking for those sysctl
905 * parameters that use the proc_dointvec_minmax() handler.
907 struct do_proc_dointvec_minmax_conv_param {
912 static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
914 int write, void *data)
917 struct do_proc_dointvec_minmax_conv_param *param = data;
919 * If writing, first do so via a temporary local int so we can
920 * bounds-check it before touching *valp.
922 int *ip = write ? &tmp : valp;
924 ret = do_proc_dointvec_conv(negp, lvalp, ip, write, data);
929 if ((param->min && *param->min > tmp) ||
930 (param->max && *param->max < tmp))
939 * proc_dointvec_minmax - read a vector of integers with min/max values
940 * @table: the sysctl table
941 * @write: %TRUE if this is a write to the sysctl file
942 * @buffer: the user buffer
943 * @lenp: the size of the user buffer
944 * @ppos: file position
946 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
947 * values from/to the user buffer, treated as an ASCII string.
949 * This routine will ensure the values are within the range specified by
950 * table->extra1 (min) and table->extra2 (max).
952 * Returns 0 on success or -EINVAL on write when the range check fails.
954 int proc_dointvec_minmax(struct ctl_table *table, int write,
955 void *buffer, size_t *lenp, loff_t *ppos)
957 struct do_proc_dointvec_minmax_conv_param param = {
958 .min = (int *) table->extra1,
959 .max = (int *) table->extra2,
961 return do_proc_dointvec(table, write, buffer, lenp, ppos,
962 do_proc_dointvec_minmax_conv, ¶m);
966 * struct do_proc_douintvec_minmax_conv_param - proc_douintvec_minmax() range checking structure
967 * @min: pointer to minimum allowable value
968 * @max: pointer to maximum allowable value
970 * The do_proc_douintvec_minmax_conv_param structure provides the
971 * minimum and maximum values for doing range checking for those sysctl
972 * parameters that use the proc_douintvec_minmax() handler.
974 struct do_proc_douintvec_minmax_conv_param {
979 static int do_proc_douintvec_minmax_conv(unsigned long *lvalp,
981 int write, void *data)
985 struct do_proc_douintvec_minmax_conv_param *param = data;
986 /* write via temporary local uint for bounds-checking */
987 unsigned int *up = write ? &tmp : valp;
989 ret = do_proc_douintvec_conv(lvalp, up, write, data);
994 if ((param->min && *param->min > tmp) ||
995 (param->max && *param->max < tmp))
1005 * proc_douintvec_minmax - read a vector of unsigned ints with min/max values
1006 * @table: the sysctl table
1007 * @write: %TRUE if this is a write to the sysctl file
1008 * @buffer: the user buffer
1009 * @lenp: the size of the user buffer
1010 * @ppos: file position
1012 * Reads/writes up to table->maxlen/sizeof(unsigned int) unsigned integer
1013 * values from/to the user buffer, treated as an ASCII string. Negative
1014 * strings are not allowed.
1016 * This routine will ensure the values are within the range specified by
1017 * table->extra1 (min) and table->extra2 (max). There is a final sanity
1018 * check for UINT_MAX to avoid having to support wrap around uses from
1021 * Returns 0 on success or -ERANGE on write when the range check fails.
1023 int proc_douintvec_minmax(struct ctl_table *table, int write,
1024 void *buffer, size_t *lenp, loff_t *ppos)
1026 struct do_proc_douintvec_minmax_conv_param param = {
1027 .min = (unsigned int *) table->extra1,
1028 .max = (unsigned int *) table->extra2,
1030 return do_proc_douintvec(table, write, buffer, lenp, ppos,
1031 do_proc_douintvec_minmax_conv, ¶m);
1035 * proc_dou8vec_minmax - read a vector of unsigned chars with min/max values
1036 * @table: the sysctl table
1037 * @write: %TRUE if this is a write to the sysctl file
1038 * @buffer: the user buffer
1039 * @lenp: the size of the user buffer
1040 * @ppos: file position
1042 * Reads/writes up to table->maxlen/sizeof(u8) unsigned chars
1043 * values from/to the user buffer, treated as an ASCII string. Negative
1044 * strings are not allowed.
1046 * This routine will ensure the values are within the range specified by
1047 * table->extra1 (min) and table->extra2 (max).
1049 * Returns 0 on success or an error on write when the range check fails.
1051 int proc_dou8vec_minmax(struct ctl_table *table, int write,
1052 void *buffer, size_t *lenp, loff_t *ppos)
1054 struct ctl_table tmp;
1055 unsigned int min = 0, max = 255U, val;
1056 u8 *data = table->data;
1057 struct do_proc_douintvec_minmax_conv_param param = {
1063 /* Do not support arrays yet. */
1064 if (table->maxlen != sizeof(u8))
1067 if (table->extra1) {
1068 min = *(unsigned int *) table->extra1;
1072 if (table->extra2) {
1073 max = *(unsigned int *) table->extra2;
1080 tmp.maxlen = sizeof(val);
1083 res = do_proc_douintvec(&tmp, write, buffer, lenp, ppos,
1084 do_proc_douintvec_minmax_conv, ¶m);
1091 EXPORT_SYMBOL_GPL(proc_dou8vec_minmax);
1093 #ifdef CONFIG_MAGIC_SYSRQ
1094 static int sysrq_sysctl_handler(struct ctl_table *table, int write,
1095 void *buffer, size_t *lenp, loff_t *ppos)
1101 ret = __do_proc_dointvec(&tmp, table, write, buffer,
1102 lenp, ppos, NULL, NULL);
1107 sysrq_toggle_support(tmp);
1113 static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table,
1114 int write, void *buffer, size_t *lenp, loff_t *ppos,
1115 unsigned long convmul, unsigned long convdiv)
1117 unsigned long *i, *min, *max;
1118 int vleft, first = 1, err = 0;
1122 if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {
1127 i = (unsigned long *) data;
1128 min = (unsigned long *) table->extra1;
1129 max = (unsigned long *) table->extra2;
1130 vleft = table->maxlen / sizeof(unsigned long);
1134 if (proc_first_pos_non_zero_ignore(ppos, table))
1137 if (left > PAGE_SIZE - 1)
1138 left = PAGE_SIZE - 1;
1142 for (; left && vleft--; i++, first = 0) {
1148 left -= proc_skip_spaces(&p);
1152 err = proc_get_long(&p, &left, &val, &neg,
1154 sizeof(proc_wspace_sep), NULL);
1160 val = convmul * val / convdiv;
1161 if ((min && val < *min) || (max && val > *max)) {
1167 val = convdiv * (*i) / convmul;
1169 proc_put_char(&buffer, &left, '\t');
1170 proc_put_long(&buffer, &left, val, false);
1174 if (!write && !first && left && !err)
1175 proc_put_char(&buffer, &left, '\n');
1177 left -= proc_skip_spaces(&p);
1179 return err ? : -EINVAL;
1186 static int do_proc_doulongvec_minmax(struct ctl_table *table, int write,
1187 void *buffer, size_t *lenp, loff_t *ppos, unsigned long convmul,
1188 unsigned long convdiv)
1190 return __do_proc_doulongvec_minmax(table->data, table, write,
1191 buffer, lenp, ppos, convmul, convdiv);
1195 * proc_doulongvec_minmax - read a vector of long integers with min/max values
1196 * @table: the sysctl table
1197 * @write: %TRUE if this is a write to the sysctl file
1198 * @buffer: the user buffer
1199 * @lenp: the size of the user buffer
1200 * @ppos: file position
1202 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
1203 * values from/to the user buffer, treated as an ASCII string.
1205 * This routine will ensure the values are within the range specified by
1206 * table->extra1 (min) and table->extra2 (max).
1208 * Returns 0 on success.
1210 int proc_doulongvec_minmax(struct ctl_table *table, int write,
1211 void *buffer, size_t *lenp, loff_t *ppos)
1213 return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);
1217 * proc_doulongvec_ms_jiffies_minmax - read a vector of millisecond values with min/max values
1218 * @table: the sysctl table
1219 * @write: %TRUE if this is a write to the sysctl file
1220 * @buffer: the user buffer
1221 * @lenp: the size of the user buffer
1222 * @ppos: file position
1224 * Reads/writes up to table->maxlen/sizeof(unsigned long) unsigned long
1225 * values from/to the user buffer, treated as an ASCII string. The values
1226 * are treated as milliseconds, and converted to jiffies when they are stored.
1228 * This routine will ensure the values are within the range specified by
1229 * table->extra1 (min) and table->extra2 (max).
1231 * Returns 0 on success.
1233 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
1234 void *buffer, size_t *lenp, loff_t *ppos)
1236 return do_proc_doulongvec_minmax(table, write, buffer,
1237 lenp, ppos, HZ, 1000l);
1241 static int do_proc_dointvec_jiffies_conv(bool *negp, unsigned long *lvalp,
1243 int write, void *data)
1246 if (*lvalp > INT_MAX / HZ)
1248 *valp = *negp ? -(*lvalp*HZ) : (*lvalp*HZ);
1254 lval = -(unsigned long)val;
1257 lval = (unsigned long)val;
1264 static int do_proc_dointvec_userhz_jiffies_conv(bool *negp, unsigned long *lvalp,
1266 int write, void *data)
1269 if (USER_HZ < HZ && *lvalp > (LONG_MAX / HZ) * USER_HZ)
1271 *valp = clock_t_to_jiffies(*negp ? -*lvalp : *lvalp);
1277 lval = -(unsigned long)val;
1280 lval = (unsigned long)val;
1282 *lvalp = jiffies_to_clock_t(lval);
1287 static int do_proc_dointvec_ms_jiffies_conv(bool *negp, unsigned long *lvalp,
1289 int write, void *data)
1292 unsigned long jif = msecs_to_jiffies(*negp ? -*lvalp : *lvalp);
1302 lval = -(unsigned long)val;
1305 lval = (unsigned long)val;
1307 *lvalp = jiffies_to_msecs(lval);
1313 * proc_dointvec_jiffies - read a vector of integers as seconds
1314 * @table: the sysctl table
1315 * @write: %TRUE if this is a write to the sysctl file
1316 * @buffer: the user buffer
1317 * @lenp: the size of the user buffer
1318 * @ppos: file position
1320 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1321 * values from/to the user buffer, treated as an ASCII string.
1322 * The values read are assumed to be in seconds, and are converted into
1325 * Returns 0 on success.
1327 int proc_dointvec_jiffies(struct ctl_table *table, int write,
1328 void *buffer, size_t *lenp, loff_t *ppos)
1330 return do_proc_dointvec(table,write,buffer,lenp,ppos,
1331 do_proc_dointvec_jiffies_conv,NULL);
1335 * proc_dointvec_userhz_jiffies - read a vector of integers as 1/USER_HZ seconds
1336 * @table: the sysctl table
1337 * @write: %TRUE if this is a write to the sysctl file
1338 * @buffer: the user buffer
1339 * @lenp: the size of the user buffer
1340 * @ppos: pointer to the file position
1342 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1343 * values from/to the user buffer, treated as an ASCII string.
1344 * The values read are assumed to be in 1/USER_HZ seconds, and
1345 * are converted into jiffies.
1347 * Returns 0 on success.
1349 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
1350 void *buffer, size_t *lenp, loff_t *ppos)
1352 return do_proc_dointvec(table,write,buffer,lenp,ppos,
1353 do_proc_dointvec_userhz_jiffies_conv,NULL);
1357 * proc_dointvec_ms_jiffies - read a vector of integers as 1 milliseconds
1358 * @table: the sysctl table
1359 * @write: %TRUE if this is a write to the sysctl file
1360 * @buffer: the user buffer
1361 * @lenp: the size of the user buffer
1362 * @ppos: file position
1363 * @ppos: the current position in the file
1365 * Reads/writes up to table->maxlen/sizeof(unsigned int) integer
1366 * values from/to the user buffer, treated as an ASCII string.
1367 * The values read are assumed to be in 1/1000 seconds, and
1368 * are converted into jiffies.
1370 * Returns 0 on success.
1372 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write, void *buffer,
1373 size_t *lenp, loff_t *ppos)
1375 return do_proc_dointvec(table, write, buffer, lenp, ppos,
1376 do_proc_dointvec_ms_jiffies_conv, NULL);
1379 static int proc_do_cad_pid(struct ctl_table *table, int write, void *buffer,
1380 size_t *lenp, loff_t *ppos)
1382 struct pid *new_pid;
1386 tmp = pid_vnr(cad_pid);
1388 r = __do_proc_dointvec(&tmp, table, write, buffer,
1389 lenp, ppos, NULL, NULL);
1393 new_pid = find_get_pid(tmp);
1397 put_pid(xchg(&cad_pid, new_pid));
1402 * proc_do_large_bitmap - read/write from/to a large bitmap
1403 * @table: the sysctl table
1404 * @write: %TRUE if this is a write to the sysctl file
1405 * @buffer: the user buffer
1406 * @lenp: the size of the user buffer
1407 * @ppos: file position
1409 * The bitmap is stored at table->data and the bitmap length (in bits)
1412 * We use a range comma separated format (e.g. 1,3-4,10-10) so that
1413 * large bitmaps may be represented in a compact manner. Writing into
1414 * the file will clear the bitmap then update it with the given input.
1416 * Returns 0 on success.
1418 int proc_do_large_bitmap(struct ctl_table *table, int write,
1419 void *buffer, size_t *lenp, loff_t *ppos)
1422 size_t left = *lenp;
1423 unsigned long bitmap_len = table->maxlen;
1424 unsigned long *bitmap = *(unsigned long **) table->data;
1425 unsigned long *tmp_bitmap = NULL;
1426 char tr_a[] = { '-', ',', '\n' }, tr_b[] = { ',', '\n', 0 }, c;
1428 if (!bitmap || !bitmap_len || !left || (*ppos && !write)) {
1437 if (left > PAGE_SIZE - 1) {
1438 left = PAGE_SIZE - 1;
1439 /* How much of the buffer we'll skip this pass */
1440 skipped = *lenp - left;
1443 tmp_bitmap = bitmap_zalloc(bitmap_len, GFP_KERNEL);
1446 proc_skip_char(&p, &left, '\n');
1447 while (!err && left) {
1448 unsigned long val_a, val_b;
1452 /* In case we stop parsing mid-number, we can reset */
1454 err = proc_get_long(&p, &left, &val_a, &neg, tr_a,
1457 * If we consumed the entirety of a truncated buffer or
1458 * only one char is left (may be a "-"), then stop here,
1459 * reset, & come back for more.
1461 if ((left <= 1) && skipped) {
1468 if (val_a >= bitmap_len || neg) {
1480 err = proc_get_long(&p, &left, &val_b,
1481 &neg, tr_b, sizeof(tr_b),
1484 * If we consumed all of a truncated buffer or
1485 * then stop here, reset, & come back for more.
1487 if (!left && skipped) {
1494 if (val_b >= bitmap_len || neg ||
1505 bitmap_set(tmp_bitmap, val_a, val_b - val_a + 1);
1506 proc_skip_char(&p, &left, '\n');
1510 unsigned long bit_a, bit_b = 0;
1514 bit_a = find_next_bit(bitmap, bitmap_len, bit_b);
1515 if (bit_a >= bitmap_len)
1517 bit_b = find_next_zero_bit(bitmap, bitmap_len,
1521 proc_put_char(&buffer, &left, ',');
1522 proc_put_long(&buffer, &left, bit_a, false);
1523 if (bit_a != bit_b) {
1524 proc_put_char(&buffer, &left, '-');
1525 proc_put_long(&buffer, &left, bit_b, false);
1530 proc_put_char(&buffer, &left, '\n');
1536 bitmap_or(bitmap, bitmap, tmp_bitmap, bitmap_len);
1538 bitmap_copy(bitmap, tmp_bitmap, bitmap_len);
1544 bitmap_free(tmp_bitmap);
1548 #else /* CONFIG_PROC_SYSCTL */
1550 int proc_dostring(struct ctl_table *table, int write,
1551 void *buffer, size_t *lenp, loff_t *ppos)
1556 int proc_dobool(struct ctl_table *table, int write,
1557 void *buffer, size_t *lenp, loff_t *ppos)
1562 int proc_dointvec(struct ctl_table *table, int write,
1563 void *buffer, size_t *lenp, loff_t *ppos)
1568 int proc_douintvec(struct ctl_table *table, int write,
1569 void *buffer, size_t *lenp, loff_t *ppos)
1574 int proc_dointvec_minmax(struct ctl_table *table, int write,
1575 void *buffer, size_t *lenp, loff_t *ppos)
1580 int proc_douintvec_minmax(struct ctl_table *table, int write,
1581 void *buffer, size_t *lenp, loff_t *ppos)
1586 int proc_dou8vec_minmax(struct ctl_table *table, int write,
1587 void *buffer, size_t *lenp, loff_t *ppos)
1592 int proc_dointvec_jiffies(struct ctl_table *table, int write,
1593 void *buffer, size_t *lenp, loff_t *ppos)
1598 int proc_dointvec_userhz_jiffies(struct ctl_table *table, int write,
1599 void *buffer, size_t *lenp, loff_t *ppos)
1604 int proc_dointvec_ms_jiffies(struct ctl_table *table, int write,
1605 void *buffer, size_t *lenp, loff_t *ppos)
1610 int proc_doulongvec_minmax(struct ctl_table *table, int write,
1611 void *buffer, size_t *lenp, loff_t *ppos)
1616 int proc_doulongvec_ms_jiffies_minmax(struct ctl_table *table, int write,
1617 void *buffer, size_t *lenp, loff_t *ppos)
1622 int proc_do_large_bitmap(struct ctl_table *table, int write,
1623 void *buffer, size_t *lenp, loff_t *ppos)
1628 #endif /* CONFIG_PROC_SYSCTL */
1630 #if defined(CONFIG_SYSCTL)
1631 int proc_do_static_key(struct ctl_table *table, int write,
1632 void *buffer, size_t *lenp, loff_t *ppos)
1634 struct static_key *key = (struct static_key *)table->data;
1635 static DEFINE_MUTEX(static_key_mutex);
1637 struct ctl_table tmp = {
1639 .maxlen = sizeof(val),
1640 .mode = table->mode,
1641 .extra1 = SYSCTL_ZERO,
1642 .extra2 = SYSCTL_ONE,
1645 if (write && !capable(CAP_SYS_ADMIN))
1648 mutex_lock(&static_key_mutex);
1649 val = static_key_enabled(key);
1650 ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
1651 if (write && !ret) {
1653 static_key_enable(key);
1655 static_key_disable(key);
1657 mutex_unlock(&static_key_mutex);
1661 static struct ctl_table kern_table[] = {
1663 .procname = "sched_child_runs_first",
1664 .data = &sysctl_sched_child_runs_first,
1665 .maxlen = sizeof(unsigned int),
1667 .proc_handler = proc_dointvec,
1669 #ifdef CONFIG_SCHEDSTATS
1671 .procname = "sched_schedstats",
1673 .maxlen = sizeof(unsigned int),
1675 .proc_handler = sysctl_schedstats,
1676 .extra1 = SYSCTL_ZERO,
1677 .extra2 = SYSCTL_ONE,
1679 #endif /* CONFIG_SCHEDSTATS */
1680 #ifdef CONFIG_TASK_DELAY_ACCT
1682 .procname = "task_delayacct",
1684 .maxlen = sizeof(unsigned int),
1686 .proc_handler = sysctl_delayacct,
1687 .extra1 = SYSCTL_ZERO,
1688 .extra2 = SYSCTL_ONE,
1690 #endif /* CONFIG_TASK_DELAY_ACCT */
1691 #ifdef CONFIG_NUMA_BALANCING
1693 .procname = "numa_balancing",
1694 .data = NULL, /* filled in by handler */
1695 .maxlen = sizeof(unsigned int),
1697 .proc_handler = sysctl_numa_balancing,
1698 .extra1 = SYSCTL_ZERO,
1699 .extra2 = SYSCTL_ONE,
1701 #endif /* CONFIG_NUMA_BALANCING */
1703 .procname = "sched_rt_period_us",
1704 .data = &sysctl_sched_rt_period,
1705 .maxlen = sizeof(unsigned int),
1707 .proc_handler = sched_rt_handler,
1710 .procname = "sched_rt_runtime_us",
1711 .data = &sysctl_sched_rt_runtime,
1712 .maxlen = sizeof(int),
1714 .proc_handler = sched_rt_handler,
1717 .procname = "sched_deadline_period_max_us",
1718 .data = &sysctl_sched_dl_period_max,
1719 .maxlen = sizeof(unsigned int),
1721 .proc_handler = proc_dointvec,
1724 .procname = "sched_deadline_period_min_us",
1725 .data = &sysctl_sched_dl_period_min,
1726 .maxlen = sizeof(unsigned int),
1728 .proc_handler = proc_dointvec,
1731 .procname = "sched_rr_timeslice_ms",
1732 .data = &sysctl_sched_rr_timeslice,
1733 .maxlen = sizeof(int),
1735 .proc_handler = sched_rr_handler,
1737 #ifdef CONFIG_UCLAMP_TASK
1739 .procname = "sched_util_clamp_min",
1740 .data = &sysctl_sched_uclamp_util_min,
1741 .maxlen = sizeof(unsigned int),
1743 .proc_handler = sysctl_sched_uclamp_handler,
1746 .procname = "sched_util_clamp_max",
1747 .data = &sysctl_sched_uclamp_util_max,
1748 .maxlen = sizeof(unsigned int),
1750 .proc_handler = sysctl_sched_uclamp_handler,
1753 .procname = "sched_util_clamp_min_rt_default",
1754 .data = &sysctl_sched_uclamp_util_min_rt_default,
1755 .maxlen = sizeof(unsigned int),
1757 .proc_handler = sysctl_sched_uclamp_handler,
1760 #ifdef CONFIG_SCHED_AUTOGROUP
1762 .procname = "sched_autogroup_enabled",
1763 .data = &sysctl_sched_autogroup_enabled,
1764 .maxlen = sizeof(unsigned int),
1766 .proc_handler = proc_dointvec_minmax,
1767 .extra1 = SYSCTL_ZERO,
1768 .extra2 = SYSCTL_ONE,
1771 #ifdef CONFIG_CFS_BANDWIDTH
1773 .procname = "sched_cfs_bandwidth_slice_us",
1774 .data = &sysctl_sched_cfs_bandwidth_slice,
1775 .maxlen = sizeof(unsigned int),
1777 .proc_handler = proc_dointvec_minmax,
1778 .extra1 = SYSCTL_ONE,
1781 #if defined(CONFIG_ENERGY_MODEL) && defined(CONFIG_CPU_FREQ_GOV_SCHEDUTIL)
1783 .procname = "sched_energy_aware",
1784 .data = &sysctl_sched_energy_aware,
1785 .maxlen = sizeof(unsigned int),
1787 .proc_handler = sched_energy_aware_handler,
1788 .extra1 = SYSCTL_ZERO,
1789 .extra2 = SYSCTL_ONE,
1792 #ifdef CONFIG_PROVE_LOCKING
1794 .procname = "prove_locking",
1795 .data = &prove_locking,
1796 .maxlen = sizeof(int),
1798 .proc_handler = proc_dointvec,
1801 #ifdef CONFIG_LOCK_STAT
1803 .procname = "lock_stat",
1805 .maxlen = sizeof(int),
1807 .proc_handler = proc_dointvec,
1811 .procname = "panic",
1812 .data = &panic_timeout,
1813 .maxlen = sizeof(int),
1815 .proc_handler = proc_dointvec,
1817 #ifdef CONFIG_PROC_SYSCTL
1819 .procname = "tainted",
1820 .maxlen = sizeof(long),
1822 .proc_handler = proc_taint,
1825 .procname = "sysctl_writes_strict",
1826 .data = &sysctl_writes_strict,
1827 .maxlen = sizeof(int),
1829 .proc_handler = proc_dointvec_minmax,
1830 .extra1 = SYSCTL_NEG_ONE,
1831 .extra2 = SYSCTL_ONE,
1834 #ifdef CONFIG_LATENCYTOP
1836 .procname = "latencytop",
1837 .data = &latencytop_enabled,
1838 .maxlen = sizeof(int),
1840 .proc_handler = sysctl_latencytop,
1843 #ifdef CONFIG_BLK_DEV_INITRD
1845 .procname = "real-root-dev",
1846 .data = &real_root_dev,
1847 .maxlen = sizeof(int),
1849 .proc_handler = proc_dointvec,
1853 .procname = "print-fatal-signals",
1854 .data = &print_fatal_signals,
1855 .maxlen = sizeof(int),
1857 .proc_handler = proc_dointvec,
1861 .procname = "reboot-cmd",
1862 .data = reboot_command,
1865 .proc_handler = proc_dostring,
1868 .procname = "stop-a",
1869 .data = &stop_a_enabled,
1870 .maxlen = sizeof (int),
1872 .proc_handler = proc_dointvec,
1875 .procname = "scons-poweroff",
1876 .data = &scons_pwroff,
1877 .maxlen = sizeof (int),
1879 .proc_handler = proc_dointvec,
1882 #ifdef CONFIG_SPARC64
1884 .procname = "tsb-ratio",
1885 .data = &sysctl_tsb_ratio,
1886 .maxlen = sizeof (int),
1888 .proc_handler = proc_dointvec,
1891 #ifdef CONFIG_PARISC
1893 .procname = "soft-power",
1894 .data = &pwrsw_enabled,
1895 .maxlen = sizeof (int),
1897 .proc_handler = proc_dointvec,
1900 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_ALLOW
1902 .procname = "unaligned-trap",
1903 .data = &unaligned_enabled,
1904 .maxlen = sizeof (int),
1906 .proc_handler = proc_dointvec,
1910 .procname = "ctrl-alt-del",
1912 .maxlen = sizeof(int),
1914 .proc_handler = proc_dointvec,
1916 #ifdef CONFIG_FUNCTION_TRACER
1918 .procname = "ftrace_enabled",
1919 .data = &ftrace_enabled,
1920 .maxlen = sizeof(int),
1922 .proc_handler = ftrace_enable_sysctl,
1925 #ifdef CONFIG_STACK_TRACER
1927 .procname = "stack_tracer_enabled",
1928 .data = &stack_tracer_enabled,
1929 .maxlen = sizeof(int),
1931 .proc_handler = stack_trace_sysctl,
1934 #ifdef CONFIG_TRACING
1936 .procname = "ftrace_dump_on_oops",
1937 .data = &ftrace_dump_on_oops,
1938 .maxlen = sizeof(int),
1940 .proc_handler = proc_dointvec,
1943 .procname = "traceoff_on_warning",
1944 .data = &__disable_trace_on_warning,
1945 .maxlen = sizeof(__disable_trace_on_warning),
1947 .proc_handler = proc_dointvec,
1950 .procname = "tracepoint_printk",
1951 .data = &tracepoint_printk,
1952 .maxlen = sizeof(tracepoint_printk),
1954 .proc_handler = tracepoint_printk_sysctl,
1957 #ifdef CONFIG_KEXEC_CORE
1959 .procname = "kexec_load_disabled",
1960 .data = &kexec_load_disabled,
1961 .maxlen = sizeof(int),
1963 /* only handle a transition from default "0" to "1" */
1964 .proc_handler = proc_dointvec_minmax,
1965 .extra1 = SYSCTL_ONE,
1966 .extra2 = SYSCTL_ONE,
1969 #ifdef CONFIG_MODULES
1971 .procname = "modprobe",
1972 .data = &modprobe_path,
1973 .maxlen = KMOD_PATH_LEN,
1975 .proc_handler = proc_dostring,
1978 .procname = "modules_disabled",
1979 .data = &modules_disabled,
1980 .maxlen = sizeof(int),
1982 /* only handle a transition from default "0" to "1" */
1983 .proc_handler = proc_dointvec_minmax,
1984 .extra1 = SYSCTL_ONE,
1985 .extra2 = SYSCTL_ONE,
1988 #ifdef CONFIG_UEVENT_HELPER
1990 .procname = "hotplug",
1991 .data = &uevent_helper,
1992 .maxlen = UEVENT_HELPER_PATH_LEN,
1994 .proc_handler = proc_dostring,
1997 #ifdef CONFIG_BSD_PROCESS_ACCT
2001 .maxlen = 3*sizeof(int),
2003 .proc_handler = proc_dointvec,
2006 #ifdef CONFIG_MAGIC_SYSRQ
2008 .procname = "sysrq",
2010 .maxlen = sizeof (int),
2012 .proc_handler = sysrq_sysctl_handler,
2015 #ifdef CONFIG_PROC_SYSCTL
2017 .procname = "cad_pid",
2019 .maxlen = sizeof (int),
2021 .proc_handler = proc_do_cad_pid,
2025 .procname = "threads-max",
2027 .maxlen = sizeof(int),
2029 .proc_handler = sysctl_max_threads,
2032 .procname = "usermodehelper",
2034 .child = usermodehelper_table,
2037 .procname = "overflowuid",
2038 .data = &overflowuid,
2039 .maxlen = sizeof(int),
2041 .proc_handler = proc_dointvec_minmax,
2042 .extra1 = SYSCTL_ZERO,
2043 .extra2 = SYSCTL_MAXOLDUID,
2046 .procname = "overflowgid",
2047 .data = &overflowgid,
2048 .maxlen = sizeof(int),
2050 .proc_handler = proc_dointvec_minmax,
2051 .extra1 = SYSCTL_ZERO,
2052 .extra2 = SYSCTL_MAXOLDUID,
2056 .procname = "userprocess_debug",
2057 .data = &show_unhandled_signals,
2058 .maxlen = sizeof(int),
2060 .proc_handler = proc_dointvec,
2065 .procname = "oops_all_cpu_backtrace",
2066 .data = &sysctl_oops_all_cpu_backtrace,
2067 .maxlen = sizeof(int),
2069 .proc_handler = proc_dointvec_minmax,
2070 .extra1 = SYSCTL_ZERO,
2071 .extra2 = SYSCTL_ONE,
2073 #endif /* CONFIG_SMP */
2075 .procname = "pid_max",
2077 .maxlen = sizeof (int),
2079 .proc_handler = proc_dointvec_minmax,
2080 .extra1 = &pid_max_min,
2081 .extra2 = &pid_max_max,
2084 .procname = "panic_on_oops",
2085 .data = &panic_on_oops,
2086 .maxlen = sizeof(int),
2088 .proc_handler = proc_dointvec,
2091 .procname = "panic_print",
2092 .data = &panic_print,
2093 .maxlen = sizeof(unsigned long),
2095 .proc_handler = proc_doulongvec_minmax,
2098 .procname = "ngroups_max",
2099 .data = (void *)&ngroups_max,
2100 .maxlen = sizeof (int),
2102 .proc_handler = proc_dointvec,
2105 .procname = "cap_last_cap",
2106 .data = (void *)&cap_last_cap,
2107 .maxlen = sizeof(int),
2109 .proc_handler = proc_dointvec,
2111 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
2113 .procname = "unknown_nmi_panic",
2114 .data = &unknown_nmi_panic,
2115 .maxlen = sizeof (int),
2117 .proc_handler = proc_dointvec,
2121 #if (defined(CONFIG_X86_32) || defined(CONFIG_PARISC)) && \
2122 defined(CONFIG_DEBUG_STACKOVERFLOW)
2124 .procname = "panic_on_stackoverflow",
2125 .data = &sysctl_panic_on_stackoverflow,
2126 .maxlen = sizeof(int),
2128 .proc_handler = proc_dointvec,
2131 #if defined(CONFIG_X86)
2133 .procname = "panic_on_unrecovered_nmi",
2134 .data = &panic_on_unrecovered_nmi,
2135 .maxlen = sizeof(int),
2137 .proc_handler = proc_dointvec,
2140 .procname = "panic_on_io_nmi",
2141 .data = &panic_on_io_nmi,
2142 .maxlen = sizeof(int),
2144 .proc_handler = proc_dointvec,
2147 .procname = "bootloader_type",
2148 .data = &bootloader_type,
2149 .maxlen = sizeof (int),
2151 .proc_handler = proc_dointvec,
2154 .procname = "bootloader_version",
2155 .data = &bootloader_version,
2156 .maxlen = sizeof (int),
2158 .proc_handler = proc_dointvec,
2161 .procname = "io_delay_type",
2162 .data = &io_delay_type,
2163 .maxlen = sizeof(int),
2165 .proc_handler = proc_dointvec,
2168 #if defined(CONFIG_MMU)
2170 .procname = "randomize_va_space",
2171 .data = &randomize_va_space,
2172 .maxlen = sizeof(int),
2174 .proc_handler = proc_dointvec,
2177 #if defined(CONFIG_S390) && defined(CONFIG_SMP)
2179 .procname = "spin_retry",
2180 .data = &spin_retry,
2181 .maxlen = sizeof (int),
2183 .proc_handler = proc_dointvec,
2186 #if defined(CONFIG_ACPI_SLEEP) && defined(CONFIG_X86)
2188 .procname = "acpi_video_flags",
2189 .data = &acpi_realmode_flags,
2190 .maxlen = sizeof (unsigned long),
2192 .proc_handler = proc_doulongvec_minmax,
2195 #ifdef CONFIG_SYSCTL_ARCH_UNALIGN_NO_WARN
2197 .procname = "ignore-unaligned-usertrap",
2198 .data = &no_unaligned_warning,
2199 .maxlen = sizeof (int),
2201 .proc_handler = proc_dointvec,
2206 .procname = "unaligned-dump-stack",
2207 .data = &unaligned_dump_stack,
2208 .maxlen = sizeof (int),
2210 .proc_handler = proc_dointvec,
2213 #ifdef CONFIG_RT_MUTEXES
2215 .procname = "max_lock_depth",
2216 .data = &max_lock_depth,
2217 .maxlen = sizeof(int),
2219 .proc_handler = proc_dointvec,
2223 .procname = "poweroff_cmd",
2224 .data = &poweroff_cmd,
2225 .maxlen = POWEROFF_CMD_PATH_LEN,
2227 .proc_handler = proc_dostring,
2233 .child = key_sysctls,
2236 #ifdef CONFIG_PERF_EVENTS
2238 * User-space scripts rely on the existence of this file
2239 * as a feature check for perf_events being enabled.
2241 * So it's an ABI, do not remove!
2244 .procname = "perf_event_paranoid",
2245 .data = &sysctl_perf_event_paranoid,
2246 .maxlen = sizeof(sysctl_perf_event_paranoid),
2248 .proc_handler = proc_dointvec,
2251 .procname = "perf_event_mlock_kb",
2252 .data = &sysctl_perf_event_mlock,
2253 .maxlen = sizeof(sysctl_perf_event_mlock),
2255 .proc_handler = proc_dointvec,
2258 .procname = "perf_event_max_sample_rate",
2259 .data = &sysctl_perf_event_sample_rate,
2260 .maxlen = sizeof(sysctl_perf_event_sample_rate),
2262 .proc_handler = perf_proc_update_handler,
2263 .extra1 = SYSCTL_ONE,
2266 .procname = "perf_cpu_time_max_percent",
2267 .data = &sysctl_perf_cpu_time_max_percent,
2268 .maxlen = sizeof(sysctl_perf_cpu_time_max_percent),
2270 .proc_handler = perf_cpu_time_max_percent_handler,
2271 .extra1 = SYSCTL_ZERO,
2272 .extra2 = SYSCTL_ONE_HUNDRED,
2275 .procname = "perf_event_max_stack",
2276 .data = &sysctl_perf_event_max_stack,
2277 .maxlen = sizeof(sysctl_perf_event_max_stack),
2279 .proc_handler = perf_event_max_stack_handler,
2280 .extra1 = SYSCTL_ZERO,
2281 .extra2 = (void *)&six_hundred_forty_kb,
2284 .procname = "perf_event_max_contexts_per_stack",
2285 .data = &sysctl_perf_event_max_contexts_per_stack,
2286 .maxlen = sizeof(sysctl_perf_event_max_contexts_per_stack),
2288 .proc_handler = perf_event_max_stack_handler,
2289 .extra1 = SYSCTL_ZERO,
2290 .extra2 = SYSCTL_ONE_THOUSAND,
2294 .procname = "panic_on_warn",
2295 .data = &panic_on_warn,
2296 .maxlen = sizeof(int),
2298 .proc_handler = proc_dointvec_minmax,
2299 .extra1 = SYSCTL_ZERO,
2300 .extra2 = SYSCTL_ONE,
2302 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
2304 .procname = "timer_migration",
2305 .data = &sysctl_timer_migration,
2306 .maxlen = sizeof(unsigned int),
2308 .proc_handler = timer_migration_handler,
2309 .extra1 = SYSCTL_ZERO,
2310 .extra2 = SYSCTL_ONE,
2313 #ifdef CONFIG_BPF_SYSCALL
2315 .procname = "unprivileged_bpf_disabled",
2316 .data = &sysctl_unprivileged_bpf_disabled,
2317 .maxlen = sizeof(sysctl_unprivileged_bpf_disabled),
2319 .proc_handler = bpf_unpriv_handler,
2320 .extra1 = SYSCTL_ZERO,
2321 .extra2 = SYSCTL_TWO,
2324 .procname = "bpf_stats_enabled",
2325 .data = &bpf_stats_enabled_key.key,
2326 .maxlen = sizeof(bpf_stats_enabled_key),
2328 .proc_handler = bpf_stats_handler,
2331 #if defined(CONFIG_TREE_RCU)
2333 .procname = "panic_on_rcu_stall",
2334 .data = &sysctl_panic_on_rcu_stall,
2335 .maxlen = sizeof(sysctl_panic_on_rcu_stall),
2337 .proc_handler = proc_dointvec_minmax,
2338 .extra1 = SYSCTL_ZERO,
2339 .extra2 = SYSCTL_ONE,
2342 #if defined(CONFIG_TREE_RCU)
2344 .procname = "max_rcu_stall_to_panic",
2345 .data = &sysctl_max_rcu_stall_to_panic,
2346 .maxlen = sizeof(sysctl_max_rcu_stall_to_panic),
2348 .proc_handler = proc_dointvec_minmax,
2349 .extra1 = SYSCTL_ONE,
2350 .extra2 = SYSCTL_INT_MAX,
2356 static struct ctl_table vm_table[] = {
2358 .procname = "overcommit_memory",
2359 .data = &sysctl_overcommit_memory,
2360 .maxlen = sizeof(sysctl_overcommit_memory),
2362 .proc_handler = overcommit_policy_handler,
2363 .extra1 = SYSCTL_ZERO,
2364 .extra2 = SYSCTL_TWO,
2367 .procname = "panic_on_oom",
2368 .data = &sysctl_panic_on_oom,
2369 .maxlen = sizeof(sysctl_panic_on_oom),
2371 .proc_handler = proc_dointvec_minmax,
2372 .extra1 = SYSCTL_ZERO,
2373 .extra2 = SYSCTL_TWO,
2376 .procname = "oom_kill_allocating_task",
2377 .data = &sysctl_oom_kill_allocating_task,
2378 .maxlen = sizeof(sysctl_oom_kill_allocating_task),
2380 .proc_handler = proc_dointvec,
2383 .procname = "oom_dump_tasks",
2384 .data = &sysctl_oom_dump_tasks,
2385 .maxlen = sizeof(sysctl_oom_dump_tasks),
2387 .proc_handler = proc_dointvec,
2390 .procname = "overcommit_ratio",
2391 .data = &sysctl_overcommit_ratio,
2392 .maxlen = sizeof(sysctl_overcommit_ratio),
2394 .proc_handler = overcommit_ratio_handler,
2397 .procname = "overcommit_kbytes",
2398 .data = &sysctl_overcommit_kbytes,
2399 .maxlen = sizeof(sysctl_overcommit_kbytes),
2401 .proc_handler = overcommit_kbytes_handler,
2404 .procname = "page-cluster",
2405 .data = &page_cluster,
2406 .maxlen = sizeof(int),
2408 .proc_handler = proc_dointvec_minmax,
2409 .extra1 = SYSCTL_ZERO,
2412 .procname = "dirty_background_ratio",
2413 .data = &dirty_background_ratio,
2414 .maxlen = sizeof(dirty_background_ratio),
2416 .proc_handler = dirty_background_ratio_handler,
2417 .extra1 = SYSCTL_ZERO,
2418 .extra2 = SYSCTL_ONE_HUNDRED,
2421 .procname = "dirty_background_bytes",
2422 .data = &dirty_background_bytes,
2423 .maxlen = sizeof(dirty_background_bytes),
2425 .proc_handler = dirty_background_bytes_handler,
2426 .extra1 = SYSCTL_LONG_ONE,
2429 .procname = "dirty_ratio",
2430 .data = &vm_dirty_ratio,
2431 .maxlen = sizeof(vm_dirty_ratio),
2433 .proc_handler = dirty_ratio_handler,
2434 .extra1 = SYSCTL_ZERO,
2435 .extra2 = SYSCTL_ONE_HUNDRED,
2438 .procname = "dirty_bytes",
2439 .data = &vm_dirty_bytes,
2440 .maxlen = sizeof(vm_dirty_bytes),
2442 .proc_handler = dirty_bytes_handler,
2443 .extra1 = (void *)&dirty_bytes_min,
2446 .procname = "dirty_writeback_centisecs",
2447 .data = &dirty_writeback_interval,
2448 .maxlen = sizeof(dirty_writeback_interval),
2450 .proc_handler = dirty_writeback_centisecs_handler,
2453 .procname = "dirty_expire_centisecs",
2454 .data = &dirty_expire_interval,
2455 .maxlen = sizeof(dirty_expire_interval),
2457 .proc_handler = proc_dointvec_minmax,
2458 .extra1 = SYSCTL_ZERO,
2461 .procname = "dirtytime_expire_seconds",
2462 .data = &dirtytime_expire_interval,
2463 .maxlen = sizeof(dirtytime_expire_interval),
2465 .proc_handler = dirtytime_interval_handler,
2466 .extra1 = SYSCTL_ZERO,
2469 .procname = "swappiness",
2470 .data = &vm_swappiness,
2471 .maxlen = sizeof(vm_swappiness),
2473 .proc_handler = proc_dointvec_minmax,
2474 .extra1 = SYSCTL_ZERO,
2475 .extra2 = SYSCTL_TWO_HUNDRED,
2477 #ifdef CONFIG_HUGETLB_PAGE
2479 .procname = "nr_hugepages",
2481 .maxlen = sizeof(unsigned long),
2483 .proc_handler = hugetlb_sysctl_handler,
2487 .procname = "nr_hugepages_mempolicy",
2489 .maxlen = sizeof(unsigned long),
2491 .proc_handler = &hugetlb_mempolicy_sysctl_handler,
2494 .procname = "numa_stat",
2495 .data = &sysctl_vm_numa_stat,
2496 .maxlen = sizeof(int),
2498 .proc_handler = sysctl_vm_numa_stat_handler,
2499 .extra1 = SYSCTL_ZERO,
2500 .extra2 = SYSCTL_ONE,
2504 .procname = "hugetlb_shm_group",
2505 .data = &sysctl_hugetlb_shm_group,
2506 .maxlen = sizeof(gid_t),
2508 .proc_handler = proc_dointvec,
2511 .procname = "nr_overcommit_hugepages",
2513 .maxlen = sizeof(unsigned long),
2515 .proc_handler = hugetlb_overcommit_handler,
2519 .procname = "lowmem_reserve_ratio",
2520 .data = &sysctl_lowmem_reserve_ratio,
2521 .maxlen = sizeof(sysctl_lowmem_reserve_ratio),
2523 .proc_handler = lowmem_reserve_ratio_sysctl_handler,
2526 .procname = "drop_caches",
2527 .data = &sysctl_drop_caches,
2528 .maxlen = sizeof(int),
2530 .proc_handler = drop_caches_sysctl_handler,
2531 .extra1 = SYSCTL_ONE,
2532 .extra2 = SYSCTL_FOUR,
2534 #ifdef CONFIG_COMPACTION
2536 .procname = "compact_memory",
2538 .maxlen = sizeof(int),
2540 .proc_handler = sysctl_compaction_handler,
2543 .procname = "compaction_proactiveness",
2544 .data = &sysctl_compaction_proactiveness,
2545 .maxlen = sizeof(sysctl_compaction_proactiveness),
2547 .proc_handler = compaction_proactiveness_sysctl_handler,
2548 .extra1 = SYSCTL_ZERO,
2549 .extra2 = SYSCTL_ONE_HUNDRED,
2552 .procname = "extfrag_threshold",
2553 .data = &sysctl_extfrag_threshold,
2554 .maxlen = sizeof(int),
2556 .proc_handler = proc_dointvec_minmax,
2557 .extra1 = SYSCTL_ZERO,
2558 .extra2 = (void *)&max_extfrag_threshold,
2561 .procname = "compact_unevictable_allowed",
2562 .data = &sysctl_compact_unevictable_allowed,
2563 .maxlen = sizeof(int),
2565 .proc_handler = proc_dointvec_minmax_warn_RT_change,
2566 .extra1 = SYSCTL_ZERO,
2567 .extra2 = SYSCTL_ONE,
2570 #endif /* CONFIG_COMPACTION */
2572 .procname = "min_free_kbytes",
2573 .data = &min_free_kbytes,
2574 .maxlen = sizeof(min_free_kbytes),
2576 .proc_handler = min_free_kbytes_sysctl_handler,
2577 .extra1 = SYSCTL_ZERO,
2580 .procname = "watermark_boost_factor",
2581 .data = &watermark_boost_factor,
2582 .maxlen = sizeof(watermark_boost_factor),
2584 .proc_handler = proc_dointvec_minmax,
2585 .extra1 = SYSCTL_ZERO,
2588 .procname = "watermark_scale_factor",
2589 .data = &watermark_scale_factor,
2590 .maxlen = sizeof(watermark_scale_factor),
2592 .proc_handler = watermark_scale_factor_sysctl_handler,
2593 .extra1 = SYSCTL_ONE,
2594 .extra2 = SYSCTL_THREE_THOUSAND,
2597 .procname = "percpu_pagelist_high_fraction",
2598 .data = &percpu_pagelist_high_fraction,
2599 .maxlen = sizeof(percpu_pagelist_high_fraction),
2601 .proc_handler = percpu_pagelist_high_fraction_sysctl_handler,
2602 .extra1 = SYSCTL_ZERO,
2605 .procname = "page_lock_unfairness",
2606 .data = &sysctl_page_lock_unfairness,
2607 .maxlen = sizeof(sysctl_page_lock_unfairness),
2609 .proc_handler = proc_dointvec_minmax,
2610 .extra1 = SYSCTL_ZERO,
2614 .procname = "max_map_count",
2615 .data = &sysctl_max_map_count,
2616 .maxlen = sizeof(sysctl_max_map_count),
2618 .proc_handler = proc_dointvec_minmax,
2619 .extra1 = SYSCTL_ZERO,
2623 .procname = "nr_trim_pages",
2624 .data = &sysctl_nr_trim_pages,
2625 .maxlen = sizeof(sysctl_nr_trim_pages),
2627 .proc_handler = proc_dointvec_minmax,
2628 .extra1 = SYSCTL_ZERO,
2632 .procname = "laptop_mode",
2633 .data = &laptop_mode,
2634 .maxlen = sizeof(laptop_mode),
2636 .proc_handler = proc_dointvec_jiffies,
2639 .procname = "vfs_cache_pressure",
2640 .data = &sysctl_vfs_cache_pressure,
2641 .maxlen = sizeof(sysctl_vfs_cache_pressure),
2643 .proc_handler = proc_dointvec_minmax,
2644 .extra1 = SYSCTL_ZERO,
2646 #if defined(HAVE_ARCH_PICK_MMAP_LAYOUT) || \
2647 defined(CONFIG_ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT)
2649 .procname = "legacy_va_layout",
2650 .data = &sysctl_legacy_va_layout,
2651 .maxlen = sizeof(sysctl_legacy_va_layout),
2653 .proc_handler = proc_dointvec_minmax,
2654 .extra1 = SYSCTL_ZERO,
2659 .procname = "zone_reclaim_mode",
2660 .data = &node_reclaim_mode,
2661 .maxlen = sizeof(node_reclaim_mode),
2663 .proc_handler = proc_dointvec_minmax,
2664 .extra1 = SYSCTL_ZERO,
2667 .procname = "min_unmapped_ratio",
2668 .data = &sysctl_min_unmapped_ratio,
2669 .maxlen = sizeof(sysctl_min_unmapped_ratio),
2671 .proc_handler = sysctl_min_unmapped_ratio_sysctl_handler,
2672 .extra1 = SYSCTL_ZERO,
2673 .extra2 = SYSCTL_ONE_HUNDRED,
2676 .procname = "min_slab_ratio",
2677 .data = &sysctl_min_slab_ratio,
2678 .maxlen = sizeof(sysctl_min_slab_ratio),
2680 .proc_handler = sysctl_min_slab_ratio_sysctl_handler,
2681 .extra1 = SYSCTL_ZERO,
2682 .extra2 = SYSCTL_ONE_HUNDRED,
2687 .procname = "stat_interval",
2688 .data = &sysctl_stat_interval,
2689 .maxlen = sizeof(sysctl_stat_interval),
2691 .proc_handler = proc_dointvec_jiffies,
2694 .procname = "stat_refresh",
2698 .proc_handler = vmstat_refresh,
2703 .procname = "mmap_min_addr",
2704 .data = &dac_mmap_min_addr,
2705 .maxlen = sizeof(unsigned long),
2707 .proc_handler = mmap_min_addr_handler,
2712 .procname = "numa_zonelist_order",
2713 .data = &numa_zonelist_order,
2714 .maxlen = NUMA_ZONELIST_ORDER_LEN,
2716 .proc_handler = numa_zonelist_order_handler,
2719 #if (defined(CONFIG_X86_32) && !defined(CONFIG_UML))|| \
2720 (defined(CONFIG_SUPERH) && defined(CONFIG_VSYSCALL))
2722 .procname = "vdso_enabled",
2723 #ifdef CONFIG_X86_32
2724 .data = &vdso32_enabled,
2725 .maxlen = sizeof(vdso32_enabled),
2727 .data = &vdso_enabled,
2728 .maxlen = sizeof(vdso_enabled),
2731 .proc_handler = proc_dointvec,
2732 .extra1 = SYSCTL_ZERO,
2735 #ifdef CONFIG_HIGHMEM
2737 .procname = "highmem_is_dirtyable",
2738 .data = &vm_highmem_is_dirtyable,
2739 .maxlen = sizeof(vm_highmem_is_dirtyable),
2741 .proc_handler = proc_dointvec_minmax,
2742 .extra1 = SYSCTL_ZERO,
2743 .extra2 = SYSCTL_ONE,
2746 #ifdef CONFIG_MEMORY_FAILURE
2748 .procname = "memory_failure_early_kill",
2749 .data = &sysctl_memory_failure_early_kill,
2750 .maxlen = sizeof(sysctl_memory_failure_early_kill),
2752 .proc_handler = proc_dointvec_minmax,
2753 .extra1 = SYSCTL_ZERO,
2754 .extra2 = SYSCTL_ONE,
2757 .procname = "memory_failure_recovery",
2758 .data = &sysctl_memory_failure_recovery,
2759 .maxlen = sizeof(sysctl_memory_failure_recovery),
2761 .proc_handler = proc_dointvec_minmax,
2762 .extra1 = SYSCTL_ZERO,
2763 .extra2 = SYSCTL_ONE,
2767 .procname = "user_reserve_kbytes",
2768 .data = &sysctl_user_reserve_kbytes,
2769 .maxlen = sizeof(sysctl_user_reserve_kbytes),
2771 .proc_handler = proc_doulongvec_minmax,
2774 .procname = "admin_reserve_kbytes",
2775 .data = &sysctl_admin_reserve_kbytes,
2776 .maxlen = sizeof(sysctl_admin_reserve_kbytes),
2778 .proc_handler = proc_doulongvec_minmax,
2780 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_BITS
2782 .procname = "mmap_rnd_bits",
2783 .data = &mmap_rnd_bits,
2784 .maxlen = sizeof(mmap_rnd_bits),
2786 .proc_handler = proc_dointvec_minmax,
2787 .extra1 = (void *)&mmap_rnd_bits_min,
2788 .extra2 = (void *)&mmap_rnd_bits_max,
2791 #ifdef CONFIG_HAVE_ARCH_MMAP_RND_COMPAT_BITS
2793 .procname = "mmap_rnd_compat_bits",
2794 .data = &mmap_rnd_compat_bits,
2795 .maxlen = sizeof(mmap_rnd_compat_bits),
2797 .proc_handler = proc_dointvec_minmax,
2798 .extra1 = (void *)&mmap_rnd_compat_bits_min,
2799 .extra2 = (void *)&mmap_rnd_compat_bits_max,
2802 #ifdef CONFIG_USERFAULTFD
2804 .procname = "unprivileged_userfaultfd",
2805 .data = &sysctl_unprivileged_userfaultfd,
2806 .maxlen = sizeof(sysctl_unprivileged_userfaultfd),
2808 .proc_handler = proc_dointvec_minmax,
2809 .extra1 = SYSCTL_ZERO,
2810 .extra2 = SYSCTL_ONE,
2816 static struct ctl_table debug_table[] = {
2817 #ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
2819 .procname = "exception-trace",
2820 .data = &show_unhandled_signals,
2821 .maxlen = sizeof(int),
2823 .proc_handler = proc_dointvec
2829 static struct ctl_table dev_table[] = {
2833 DECLARE_SYSCTL_BASE(kernel, kern_table);
2834 DECLARE_SYSCTL_BASE(vm, vm_table);
2835 DECLARE_SYSCTL_BASE(debug, debug_table);
2836 DECLARE_SYSCTL_BASE(dev, dev_table);
2838 int __init sysctl_init_bases(void)
2840 register_sysctl_base(kernel);
2841 register_sysctl_base(vm);
2842 register_sysctl_base(debug);
2843 register_sysctl_base(dev);
2847 #endif /* CONFIG_SYSCTL */
2849 * No sense putting this after each symbol definition, twice,
2850 * exception granted :-)
2852 EXPORT_SYMBOL(proc_dobool);
2853 EXPORT_SYMBOL(proc_dointvec);
2854 EXPORT_SYMBOL(proc_douintvec);
2855 EXPORT_SYMBOL(proc_dointvec_jiffies);
2856 EXPORT_SYMBOL(proc_dointvec_minmax);
2857 EXPORT_SYMBOL_GPL(proc_douintvec_minmax);
2858 EXPORT_SYMBOL(proc_dointvec_userhz_jiffies);
2859 EXPORT_SYMBOL(proc_dointvec_ms_jiffies);
2860 EXPORT_SYMBOL(proc_dostring);
2861 EXPORT_SYMBOL(proc_doulongvec_minmax);
2862 EXPORT_SYMBOL(proc_doulongvec_ms_jiffies_minmax);
2863 EXPORT_SYMBOL(proc_do_large_bitmap);